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/pfil.h> 114 #include <net/vnet.h> 115 116 #include <netinet/in.h> 117 #include <netinet/in_systm.h> 118 #include <netinet/in_var.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #ifdef INET6 122 #include <netinet/ip6.h> 123 #include <netinet6/ip6_var.h> 124 #include <netinet6/in6_ifattach.h> 125 #endif 126 #if defined(INET) || defined(INET6) 127 #include <netinet/ip_carp.h> 128 #endif 129 #include <machine/in_cksum.h> 130 #include <netinet/if_ether.h> 131 #include <net/bridgestp.h> 132 #include <net/if_bridgevar.h> 133 #include <net/if_llc.h> 134 #include <net/if_vlan_var.h> 135 136 #include <net/route.h> 137 138 #ifdef INET6 139 /* 140 * XXX: declare here to avoid to include many inet6 related files.. 141 * should be more generalized? 142 */ 143 extern void nd6_setmtu(struct ifnet *); 144 #endif 145 146 /* 147 * Size of the route hash table. Must be a power of two. 148 */ 149 #ifndef BRIDGE_RTHASH_SIZE 150 #define BRIDGE_RTHASH_SIZE 1024 151 #endif 152 153 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 154 155 /* 156 * Default maximum number of addresses to cache. 157 */ 158 #ifndef BRIDGE_RTABLE_MAX 159 #define BRIDGE_RTABLE_MAX 2000 160 #endif 161 162 /* 163 * Timeout (in seconds) for entries learned dynamically. 164 */ 165 #ifndef BRIDGE_RTABLE_TIMEOUT 166 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 167 #endif 168 169 /* 170 * Number of seconds between walks of the route list. 171 */ 172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 173 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 174 #endif 175 176 /* 177 * List of capabilities to possibly mask on the member interface. 178 */ 179 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 180 IFCAP_TXCSUM_IPV6) 181 182 /* 183 * List of capabilities to strip 184 */ 185 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 186 187 /* 188 * Bridge locking 189 * 190 * The bridge relies heavily on the epoch(9) system to protect its data 191 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 192 * must ensure there is only one writer at a time. 193 * 194 * That is: for read accesses we only need to be in NET_EPOCH, but for write 195 * accesses we must hold: 196 * 197 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 198 * - BRIDGE_LOCK, for any other change 199 * 200 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 201 * calls to bridge member interfaces and these ioctl()s can sleep. 202 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 203 * required while we're in NET_EPOCH and then we're not allowed to sleep. 204 */ 205 #define BRIDGE_LOCK_INIT(_sc) do { \ 206 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 207 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 208 } while (0) 209 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 210 sx_destroy(&(_sc)->sc_sx); \ 211 mtx_destroy(&(_sc)->sc_rt_mtx); \ 212 } while (0) 213 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 214 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 215 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 216 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 217 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 218 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 219 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 220 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 221 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 222 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 223 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 224 225 /* 226 * Bridge interface list entry. 227 */ 228 struct bridge_iflist { 229 CK_LIST_ENTRY(bridge_iflist) bif_next; 230 struct ifnet *bif_ifp; /* member if */ 231 struct bstp_port bif_stp; /* STP state */ 232 uint32_t bif_flags; /* member if flags */ 233 int bif_savedcaps; /* saved capabilities */ 234 uint32_t bif_addrmax; /* max # of addresses */ 235 uint32_t bif_addrcnt; /* cur. # of addresses */ 236 uint32_t bif_addrexceeded;/* # of address violations */ 237 struct epoch_context bif_epoch_ctx; 238 }; 239 240 /* 241 * Bridge route node. 242 */ 243 struct bridge_rtnode { 244 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 245 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 246 struct bridge_iflist *brt_dst; /* destination if */ 247 unsigned long brt_expire; /* expiration time */ 248 uint8_t brt_flags; /* address flags */ 249 uint8_t brt_addr[ETHER_ADDR_LEN]; 250 uint16_t brt_vlan; /* vlan id */ 251 struct vnet *brt_vnet; 252 struct epoch_context brt_epoch_ctx; 253 }; 254 #define brt_ifp brt_dst->bif_ifp 255 256 /* 257 * Software state for each bridge. 258 */ 259 struct bridge_softc { 260 struct ifnet *sc_ifp; /* make this an interface */ 261 LIST_ENTRY(bridge_softc) sc_list; 262 struct sx sc_sx; 263 struct mtx sc_rt_mtx; 264 uint32_t sc_brtmax; /* max # of addresses */ 265 uint32_t sc_brtcnt; /* cur. # of addresses */ 266 uint32_t sc_brttimeout; /* rt timeout in seconds */ 267 struct callout sc_brcallout; /* bridge callout */ 268 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 269 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 270 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 271 uint32_t sc_rthash_key; /* key for hash */ 272 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 273 struct bstp_state sc_stp; /* STP state */ 274 uint32_t sc_brtexceeded; /* # of cache drops */ 275 struct ifnet *sc_ifaddr; /* member mac copied from */ 276 struct ether_addr sc_defaddr; /* Default MAC address */ 277 struct epoch_context sc_epoch_ctx; 278 }; 279 280 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 281 #define V_bridge_list_sx VNET(bridge_list_sx) 282 static eventhandler_tag bridge_detach_cookie; 283 284 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 285 286 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 287 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 288 289 static int bridge_clone_create(struct if_clone *, char *, size_t, 290 struct ifc_data *, struct ifnet **); 291 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 292 293 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 294 static void bridge_mutecaps(struct bridge_softc *); 295 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 296 int); 297 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 298 static void bridge_init(void *); 299 static void bridge_dummynet(struct mbuf *, struct ifnet *); 300 static void bridge_stop(struct ifnet *, int); 301 static int bridge_transmit(struct ifnet *, struct mbuf *); 302 #ifdef ALTQ 303 static void bridge_altq_start(if_t); 304 static int bridge_altq_transmit(if_t, struct mbuf *); 305 #endif 306 static void bridge_qflush(struct ifnet *); 307 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 308 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 309 struct rtentry *); 310 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 311 struct mbuf *); 312 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 313 314 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 315 struct mbuf *m); 316 317 static void bridge_timer(void *); 318 319 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 320 struct mbuf *, int); 321 static void bridge_span(struct bridge_softc *, struct mbuf *); 322 323 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 324 uint16_t, struct bridge_iflist *, int, uint8_t); 325 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 326 uint16_t); 327 static void bridge_rttrim(struct bridge_softc *); 328 static void bridge_rtage(struct bridge_softc *); 329 static void bridge_rtflush(struct bridge_softc *, int); 330 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 331 uint16_t); 332 333 static void bridge_rtable_init(struct bridge_softc *); 334 static void bridge_rtable_fini(struct bridge_softc *); 335 336 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 337 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 338 const uint8_t *, uint16_t); 339 static int bridge_rtnode_insert(struct bridge_softc *, 340 struct bridge_rtnode *); 341 static void bridge_rtnode_destroy(struct bridge_softc *, 342 struct bridge_rtnode *); 343 static void bridge_rtable_expire(struct ifnet *, int); 344 static void bridge_state_change(struct ifnet *, int); 345 346 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 347 const char *name); 348 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 349 struct ifnet *ifp); 350 static void bridge_delete_member(struct bridge_softc *, 351 struct bridge_iflist *, int); 352 static void bridge_delete_span(struct bridge_softc *, 353 struct bridge_iflist *); 354 355 static int bridge_ioctl_add(struct bridge_softc *, void *); 356 static int bridge_ioctl_del(struct bridge_softc *, void *); 357 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 358 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 359 static int bridge_ioctl_scache(struct bridge_softc *, void *); 360 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 361 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 362 static int bridge_ioctl_rts(struct bridge_softc *, void *); 363 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 364 static int bridge_ioctl_sto(struct bridge_softc *, void *); 365 static int bridge_ioctl_gto(struct bridge_softc *, void *); 366 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 367 static int bridge_ioctl_flush(struct bridge_softc *, void *); 368 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 369 static int bridge_ioctl_spri(struct bridge_softc *, void *); 370 static int bridge_ioctl_ght(struct bridge_softc *, void *); 371 static int bridge_ioctl_sht(struct bridge_softc *, void *); 372 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 373 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 374 static int bridge_ioctl_gma(struct bridge_softc *, void *); 375 static int bridge_ioctl_sma(struct bridge_softc *, void *); 376 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 377 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 378 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 379 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 380 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 381 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 382 static int bridge_ioctl_grte(struct bridge_softc *, void *); 383 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 384 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 385 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 386 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 387 int); 388 static int bridge_ip_checkbasic(struct mbuf **mp); 389 #ifdef INET6 390 static int bridge_ip6_checkbasic(struct mbuf **mp); 391 #endif /* INET6 */ 392 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 393 struct ether_header *, int, struct llc *); 394 static void bridge_linkstate(struct ifnet *ifp); 395 static void bridge_linkcheck(struct bridge_softc *sc); 396 397 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 398 #define VLANTAGOF(_m) \ 399 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 400 401 static struct bstp_cb_ops bridge_ops = { 402 .bcb_state = bridge_state_change, 403 .bcb_rtage = bridge_rtable_expire 404 }; 405 406 SYSCTL_DECL(_net_link); 407 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 408 "Bridge"); 409 410 /* only pass IP[46] packets when pfil is enabled */ 411 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 412 #define V_pfil_onlyip VNET(pfil_onlyip) 413 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 414 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 415 "Only pass IP packets when pfil is enabled"); 416 417 /* run pfil hooks on the bridge interface */ 418 VNET_DEFINE_STATIC(int, pfil_bridge) = 1; 419 #define V_pfil_bridge VNET(pfil_bridge) 420 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 421 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 422 "Packet filter on the bridge interface"); 423 424 /* layer2 filter with ipfw */ 425 VNET_DEFINE_STATIC(int, pfil_ipfw); 426 #define V_pfil_ipfw VNET(pfil_ipfw) 427 428 /* layer2 ARP filter with ipfw */ 429 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 430 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 431 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 432 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 433 "Filter ARP packets through IPFW layer2"); 434 435 /* run pfil hooks on the member interface */ 436 VNET_DEFINE_STATIC(int, pfil_member) = 1; 437 #define V_pfil_member VNET(pfil_member) 438 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 439 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 440 "Packet filter on the member interface"); 441 442 /* run pfil hooks on the physical interface for locally destined packets */ 443 VNET_DEFINE_STATIC(int, pfil_local_phys); 444 #define V_pfil_local_phys VNET(pfil_local_phys) 445 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 446 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 447 "Packet filter on the physical interface for locally destined packets"); 448 449 /* log STP state changes */ 450 VNET_DEFINE_STATIC(int, log_stp); 451 #define V_log_stp VNET(log_stp) 452 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 453 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 454 "Log STP state changes"); 455 456 /* share MAC with first bridge member */ 457 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 458 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 459 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 460 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 461 "Inherit MAC address from the first bridge member"); 462 463 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 464 #define V_allow_llz_overlap VNET(allow_llz_overlap) 465 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 466 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 467 "Allow overlap of link-local scope " 468 "zones of a bridge interface and the member interfaces"); 469 470 struct bridge_control { 471 int (*bc_func)(struct bridge_softc *, void *); 472 int bc_argsize; 473 int bc_flags; 474 }; 475 476 #define BC_F_COPYIN 0x01 /* copy arguments in */ 477 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 478 #define BC_F_SUSER 0x04 /* do super-user check */ 479 480 const struct bridge_control bridge_control_table[] = { 481 { bridge_ioctl_add, sizeof(struct ifbreq), 482 BC_F_COPYIN|BC_F_SUSER }, 483 { bridge_ioctl_del, sizeof(struct ifbreq), 484 BC_F_COPYIN|BC_F_SUSER }, 485 486 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 487 BC_F_COPYIN|BC_F_COPYOUT }, 488 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 489 BC_F_COPYIN|BC_F_SUSER }, 490 491 { bridge_ioctl_scache, sizeof(struct ifbrparam), 492 BC_F_COPYIN|BC_F_SUSER }, 493 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 494 BC_F_COPYOUT }, 495 496 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 497 BC_F_COPYIN|BC_F_COPYOUT }, 498 { bridge_ioctl_rts, sizeof(struct ifbaconf), 499 BC_F_COPYIN|BC_F_COPYOUT }, 500 501 { bridge_ioctl_saddr, sizeof(struct ifbareq), 502 BC_F_COPYIN|BC_F_SUSER }, 503 504 { bridge_ioctl_sto, sizeof(struct ifbrparam), 505 BC_F_COPYIN|BC_F_SUSER }, 506 { bridge_ioctl_gto, sizeof(struct ifbrparam), 507 BC_F_COPYOUT }, 508 509 { bridge_ioctl_daddr, sizeof(struct ifbareq), 510 BC_F_COPYIN|BC_F_SUSER }, 511 512 { bridge_ioctl_flush, sizeof(struct ifbreq), 513 BC_F_COPYIN|BC_F_SUSER }, 514 515 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 516 BC_F_COPYOUT }, 517 { bridge_ioctl_spri, sizeof(struct ifbrparam), 518 BC_F_COPYIN|BC_F_SUSER }, 519 520 { bridge_ioctl_ght, sizeof(struct ifbrparam), 521 BC_F_COPYOUT }, 522 { bridge_ioctl_sht, sizeof(struct ifbrparam), 523 BC_F_COPYIN|BC_F_SUSER }, 524 525 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 526 BC_F_COPYOUT }, 527 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 528 BC_F_COPYIN|BC_F_SUSER }, 529 530 { bridge_ioctl_gma, sizeof(struct ifbrparam), 531 BC_F_COPYOUT }, 532 { bridge_ioctl_sma, sizeof(struct ifbrparam), 533 BC_F_COPYIN|BC_F_SUSER }, 534 535 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 536 BC_F_COPYIN|BC_F_SUSER }, 537 538 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 539 BC_F_COPYIN|BC_F_SUSER }, 540 541 { bridge_ioctl_addspan, sizeof(struct ifbreq), 542 BC_F_COPYIN|BC_F_SUSER }, 543 { bridge_ioctl_delspan, sizeof(struct ifbreq), 544 BC_F_COPYIN|BC_F_SUSER }, 545 546 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 547 BC_F_COPYOUT }, 548 549 { bridge_ioctl_grte, sizeof(struct ifbrparam), 550 BC_F_COPYOUT }, 551 552 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 553 BC_F_COPYIN|BC_F_COPYOUT }, 554 555 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 556 BC_F_COPYIN|BC_F_SUSER }, 557 558 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 559 BC_F_COPYIN|BC_F_SUSER }, 560 561 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 562 BC_F_COPYIN|BC_F_SUSER }, 563 564 }; 565 const int bridge_control_table_size = nitems(bridge_control_table); 566 567 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 568 #define V_bridge_list VNET(bridge_list) 569 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 570 "if_bridge list") 571 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 572 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 573 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 574 575 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 576 #define V_bridge_cloner VNET(bridge_cloner) 577 578 static const char bridge_name[] = "bridge"; 579 580 static void 581 vnet_bridge_init(const void *unused __unused) 582 { 583 584 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 585 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 586 UMA_ALIGN_PTR, 0); 587 BRIDGE_LIST_LOCK_INIT(); 588 LIST_INIT(&V_bridge_list); 589 590 struct if_clone_addreq req = { 591 .create_f = bridge_clone_create, 592 .destroy_f = bridge_clone_destroy, 593 .flags = IFC_F_AUTOUNIT, 594 }; 595 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 596 } 597 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 598 vnet_bridge_init, NULL); 599 600 static void 601 vnet_bridge_uninit(const void *unused __unused) 602 { 603 604 ifc_detach_cloner(V_bridge_cloner); 605 V_bridge_cloner = NULL; 606 BRIDGE_LIST_LOCK_DESTROY(); 607 608 /* Callbacks may use the UMA zone. */ 609 NET_EPOCH_DRAIN_CALLBACKS(); 610 611 uma_zdestroy(V_bridge_rtnode_zone); 612 } 613 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 614 vnet_bridge_uninit, NULL); 615 616 static int 617 bridge_modevent(module_t mod, int type, void *data) 618 { 619 620 switch (type) { 621 case MOD_LOAD: 622 bridge_dn_p = bridge_dummynet; 623 bridge_detach_cookie = EVENTHANDLER_REGISTER( 624 ifnet_departure_event, bridge_ifdetach, NULL, 625 EVENTHANDLER_PRI_ANY); 626 break; 627 case MOD_UNLOAD: 628 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 629 bridge_detach_cookie); 630 bridge_dn_p = NULL; 631 break; 632 default: 633 return (EOPNOTSUPP); 634 } 635 return (0); 636 } 637 638 static moduledata_t bridge_mod = { 639 "if_bridge", 640 bridge_modevent, 641 0 642 }; 643 644 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 645 MODULE_VERSION(if_bridge, 1); 646 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 647 648 /* 649 * handler for net.link.bridge.ipfw 650 */ 651 static int 652 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 653 { 654 int enable = V_pfil_ipfw; 655 int error; 656 657 error = sysctl_handle_int(oidp, &enable, 0, req); 658 enable &= 1; 659 660 if (enable != V_pfil_ipfw) { 661 V_pfil_ipfw = enable; 662 663 /* 664 * Disable pfil so that ipfw doesnt run twice, if the user 665 * really wants both then they can re-enable pfil_bridge and/or 666 * pfil_member. Also allow non-ip packets as ipfw can filter by 667 * layer2 type. 668 */ 669 if (V_pfil_ipfw) { 670 V_pfil_onlyip = 0; 671 V_pfil_bridge = 0; 672 V_pfil_member = 0; 673 } 674 } 675 676 return (error); 677 } 678 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 679 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 680 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 681 "Layer2 filter with IPFW"); 682 683 #ifdef VIMAGE 684 static void 685 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 686 { 687 struct bridge_softc *sc = ifp->if_softc; 688 struct bridge_iflist *bif; 689 690 BRIDGE_LOCK(sc); 691 692 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 693 bridge_delete_member(sc, bif, 0); 694 695 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 696 bridge_delete_span(sc, bif); 697 } 698 699 BRIDGE_UNLOCK(sc); 700 701 ether_reassign(ifp, newvnet, arg); 702 } 703 #endif 704 705 /* 706 * bridge_clone_create: 707 * 708 * Create a new bridge instance. 709 */ 710 static int 711 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 712 struct ifc_data *ifd, struct ifnet **ifpp) 713 { 714 struct bridge_softc *sc; 715 struct ifnet *ifp; 716 717 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 718 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 719 if (ifp == NULL) { 720 free(sc, M_DEVBUF); 721 return (ENOSPC); 722 } 723 724 BRIDGE_LOCK_INIT(sc); 725 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 726 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 727 728 /* Initialize our routing table. */ 729 bridge_rtable_init(sc); 730 731 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 732 733 CK_LIST_INIT(&sc->sc_iflist); 734 CK_LIST_INIT(&sc->sc_spanlist); 735 736 ifp->if_softc = sc; 737 if_initname(ifp, bridge_name, ifd->unit); 738 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 739 ifp->if_ioctl = bridge_ioctl; 740 #ifdef ALTQ 741 ifp->if_start = bridge_altq_start; 742 ifp->if_transmit = bridge_altq_transmit; 743 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 744 ifp->if_snd.ifq_drv_maxlen = 0; 745 IFQ_SET_READY(&ifp->if_snd); 746 #else 747 ifp->if_transmit = bridge_transmit; 748 #endif 749 ifp->if_qflush = bridge_qflush; 750 ifp->if_init = bridge_init; 751 ifp->if_type = IFT_BRIDGE; 752 753 ether_gen_addr(ifp, &sc->sc_defaddr); 754 755 bstp_attach(&sc->sc_stp, &bridge_ops); 756 ether_ifattach(ifp, sc->sc_defaddr.octet); 757 /* Now undo some of the damage... */ 758 ifp->if_baudrate = 0; 759 ifp->if_type = IFT_BRIDGE; 760 #ifdef VIMAGE 761 ifp->if_reassign = bridge_reassign; 762 #endif 763 764 BRIDGE_LIST_LOCK(); 765 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 766 BRIDGE_LIST_UNLOCK(); 767 *ifpp = ifp; 768 769 return (0); 770 } 771 772 static void 773 bridge_clone_destroy_cb(struct epoch_context *ctx) 774 { 775 struct bridge_softc *sc; 776 777 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 778 779 BRIDGE_LOCK_DESTROY(sc); 780 free(sc, M_DEVBUF); 781 } 782 783 /* 784 * bridge_clone_destroy: 785 * 786 * Destroy a bridge instance. 787 */ 788 static int 789 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 790 { 791 struct bridge_softc *sc = ifp->if_softc; 792 struct bridge_iflist *bif; 793 struct epoch_tracker et; 794 795 BRIDGE_LOCK(sc); 796 797 bridge_stop(ifp, 1); 798 ifp->if_flags &= ~IFF_UP; 799 800 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 801 bridge_delete_member(sc, bif, 0); 802 803 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 804 bridge_delete_span(sc, bif); 805 } 806 807 /* Tear down the routing table. */ 808 bridge_rtable_fini(sc); 809 810 BRIDGE_UNLOCK(sc); 811 812 NET_EPOCH_ENTER(et); 813 814 callout_drain(&sc->sc_brcallout); 815 816 BRIDGE_LIST_LOCK(); 817 LIST_REMOVE(sc, sc_list); 818 BRIDGE_LIST_UNLOCK(); 819 820 bstp_detach(&sc->sc_stp); 821 #ifdef ALTQ 822 IFQ_PURGE(&ifp->if_snd); 823 #endif 824 NET_EPOCH_EXIT(et); 825 826 ether_ifdetach(ifp); 827 if_free(ifp); 828 829 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 830 831 return (0); 832 } 833 834 /* 835 * bridge_ioctl: 836 * 837 * Handle a control request from the operator. 838 */ 839 static int 840 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 841 { 842 struct bridge_softc *sc = ifp->if_softc; 843 struct ifreq *ifr = (struct ifreq *)data; 844 struct bridge_iflist *bif; 845 struct thread *td = curthread; 846 union { 847 struct ifbreq ifbreq; 848 struct ifbifconf ifbifconf; 849 struct ifbareq ifbareq; 850 struct ifbaconf ifbaconf; 851 struct ifbrparam ifbrparam; 852 struct ifbropreq ifbropreq; 853 } args; 854 struct ifdrv *ifd = (struct ifdrv *) data; 855 const struct bridge_control *bc; 856 int error = 0, oldmtu; 857 858 BRIDGE_LOCK(sc); 859 860 switch (cmd) { 861 case SIOCADDMULTI: 862 case SIOCDELMULTI: 863 break; 864 865 case SIOCGDRVSPEC: 866 case SIOCSDRVSPEC: 867 if (ifd->ifd_cmd >= bridge_control_table_size) { 868 error = EINVAL; 869 break; 870 } 871 bc = &bridge_control_table[ifd->ifd_cmd]; 872 873 if (cmd == SIOCGDRVSPEC && 874 (bc->bc_flags & BC_F_COPYOUT) == 0) { 875 error = EINVAL; 876 break; 877 } 878 else if (cmd == SIOCSDRVSPEC && 879 (bc->bc_flags & BC_F_COPYOUT) != 0) { 880 error = EINVAL; 881 break; 882 } 883 884 if (bc->bc_flags & BC_F_SUSER) { 885 error = priv_check(td, PRIV_NET_BRIDGE); 886 if (error) 887 break; 888 } 889 890 if (ifd->ifd_len != bc->bc_argsize || 891 ifd->ifd_len > sizeof(args)) { 892 error = EINVAL; 893 break; 894 } 895 896 bzero(&args, sizeof(args)); 897 if (bc->bc_flags & BC_F_COPYIN) { 898 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 899 if (error) 900 break; 901 } 902 903 oldmtu = ifp->if_mtu; 904 error = (*bc->bc_func)(sc, &args); 905 if (error) 906 break; 907 908 /* 909 * Bridge MTU may change during addition of the first port. 910 * If it did, do network layer specific procedure. 911 */ 912 if (ifp->if_mtu != oldmtu) { 913 #ifdef INET6 914 nd6_setmtu(ifp); 915 #endif 916 rt_updatemtu(ifp); 917 } 918 919 if (bc->bc_flags & BC_F_COPYOUT) 920 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 921 922 break; 923 924 case SIOCSIFFLAGS: 925 if (!(ifp->if_flags & IFF_UP) && 926 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 927 /* 928 * If interface is marked down and it is running, 929 * then stop and disable it. 930 */ 931 bridge_stop(ifp, 1); 932 } else if ((ifp->if_flags & IFF_UP) && 933 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 934 /* 935 * If interface is marked up and it is stopped, then 936 * start it. 937 */ 938 BRIDGE_UNLOCK(sc); 939 (*ifp->if_init)(sc); 940 BRIDGE_LOCK(sc); 941 } 942 break; 943 944 case SIOCSIFMTU: 945 oldmtu = sc->sc_ifp->if_mtu; 946 947 if (ifr->ifr_mtu < 576) { 948 error = EINVAL; 949 break; 950 } 951 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 952 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 953 break; 954 } 955 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 956 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 957 SIOCSIFMTU, (caddr_t)ifr); 958 if (error != 0) { 959 log(LOG_NOTICE, "%s: invalid MTU: %u for" 960 " member %s\n", sc->sc_ifp->if_xname, 961 ifr->ifr_mtu, 962 bif->bif_ifp->if_xname); 963 error = EINVAL; 964 break; 965 } 966 } 967 if (error) { 968 /* Restore the previous MTU on all member interfaces. */ 969 ifr->ifr_mtu = oldmtu; 970 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 971 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 972 SIOCSIFMTU, (caddr_t)ifr); 973 } 974 } else { 975 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 976 } 977 break; 978 default: 979 /* 980 * drop the lock as ether_ioctl() will call bridge_start() and 981 * cause the lock to be recursed. 982 */ 983 BRIDGE_UNLOCK(sc); 984 error = ether_ioctl(ifp, cmd, data); 985 BRIDGE_LOCK(sc); 986 break; 987 } 988 989 BRIDGE_UNLOCK(sc); 990 991 return (error); 992 } 993 994 /* 995 * bridge_mutecaps: 996 * 997 * Clear or restore unwanted capabilities on the member interface 998 */ 999 static void 1000 bridge_mutecaps(struct bridge_softc *sc) 1001 { 1002 struct bridge_iflist *bif; 1003 int enabled, mask; 1004 1005 BRIDGE_LOCK_ASSERT(sc); 1006 1007 /* Initial bitmask of capabilities to test */ 1008 mask = BRIDGE_IFCAPS_MASK; 1009 1010 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1011 /* Every member must support it or its disabled */ 1012 mask &= bif->bif_savedcaps; 1013 } 1014 1015 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1016 enabled = bif->bif_ifp->if_capenable; 1017 enabled &= ~BRIDGE_IFCAPS_STRIP; 1018 /* strip off mask bits and enable them again if allowed */ 1019 enabled &= ~BRIDGE_IFCAPS_MASK; 1020 enabled |= mask; 1021 bridge_set_ifcap(sc, bif, enabled); 1022 } 1023 } 1024 1025 static void 1026 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1027 { 1028 struct ifnet *ifp = bif->bif_ifp; 1029 struct ifreq ifr; 1030 int error, mask, stuck; 1031 1032 bzero(&ifr, sizeof(ifr)); 1033 ifr.ifr_reqcap = set; 1034 1035 if (ifp->if_capenable != set) { 1036 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1037 if (error) 1038 if_printf(sc->sc_ifp, 1039 "error setting capabilities on %s: %d\n", 1040 ifp->if_xname, error); 1041 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1042 stuck = ifp->if_capenable & mask & ~set; 1043 if (stuck != 0) 1044 if_printf(sc->sc_ifp, 1045 "can't disable some capabilities on %s: 0x%x\n", 1046 ifp->if_xname, stuck); 1047 } 1048 } 1049 1050 /* 1051 * bridge_lookup_member: 1052 * 1053 * Lookup a bridge member interface. 1054 */ 1055 static struct bridge_iflist * 1056 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1057 { 1058 struct bridge_iflist *bif; 1059 struct ifnet *ifp; 1060 1061 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1062 1063 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1064 ifp = bif->bif_ifp; 1065 if (strcmp(ifp->if_xname, name) == 0) 1066 return (bif); 1067 } 1068 1069 return (NULL); 1070 } 1071 1072 /* 1073 * bridge_lookup_member_if: 1074 * 1075 * Lookup a bridge member interface by ifnet*. 1076 */ 1077 static struct bridge_iflist * 1078 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1079 { 1080 struct bridge_iflist *bif; 1081 1082 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1083 1084 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1085 if (bif->bif_ifp == member_ifp) 1086 return (bif); 1087 } 1088 1089 return (NULL); 1090 } 1091 1092 static void 1093 bridge_delete_member_cb(struct epoch_context *ctx) 1094 { 1095 struct bridge_iflist *bif; 1096 1097 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1098 1099 free(bif, M_DEVBUF); 1100 } 1101 1102 /* 1103 * bridge_delete_member: 1104 * 1105 * Delete the specified member interface. 1106 */ 1107 static void 1108 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1109 int gone) 1110 { 1111 struct ifnet *ifs = bif->bif_ifp; 1112 struct ifnet *fif = NULL; 1113 struct bridge_iflist *bifl; 1114 1115 BRIDGE_LOCK_ASSERT(sc); 1116 1117 if (bif->bif_flags & IFBIF_STP) 1118 bstp_disable(&bif->bif_stp); 1119 1120 ifs->if_bridge = NULL; 1121 CK_LIST_REMOVE(bif, bif_next); 1122 1123 /* 1124 * If removing the interface that gave the bridge its mac address, set 1125 * the mac address of the bridge to the address of the next member, or 1126 * to its default address if no members are left. 1127 */ 1128 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1129 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1130 bcopy(&sc->sc_defaddr, 1131 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1132 sc->sc_ifaddr = NULL; 1133 } else { 1134 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1135 fif = bifl->bif_ifp; 1136 bcopy(IF_LLADDR(fif), 1137 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1138 sc->sc_ifaddr = fif; 1139 } 1140 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1141 } 1142 1143 bridge_linkcheck(sc); 1144 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1145 BRIDGE_RT_LOCK(sc); 1146 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1147 BRIDGE_RT_UNLOCK(sc); 1148 KASSERT(bif->bif_addrcnt == 0, 1149 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1150 1151 ifs->if_bridge_output = NULL; 1152 ifs->if_bridge_input = NULL; 1153 ifs->if_bridge_linkstate = NULL; 1154 if (!gone) { 1155 switch (ifs->if_type) { 1156 case IFT_ETHER: 1157 case IFT_L2VLAN: 1158 /* 1159 * Take the interface out of promiscuous mode, but only 1160 * if it was promiscuous in the first place. It might 1161 * not be if we're in the bridge_ioctl_add() error path. 1162 */ 1163 if (ifs->if_flags & IFF_PROMISC) 1164 (void) ifpromisc(ifs, 0); 1165 break; 1166 1167 case IFT_GIF: 1168 break; 1169 1170 default: 1171 #ifdef DIAGNOSTIC 1172 panic("bridge_delete_member: impossible"); 1173 #endif 1174 break; 1175 } 1176 /* reneable any interface capabilities */ 1177 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1178 } 1179 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1180 1181 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1182 } 1183 1184 /* 1185 * bridge_delete_span: 1186 * 1187 * Delete the specified span interface. 1188 */ 1189 static void 1190 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1191 { 1192 BRIDGE_LOCK_ASSERT(sc); 1193 1194 KASSERT(bif->bif_ifp->if_bridge == NULL, 1195 ("%s: not a span interface", __func__)); 1196 1197 CK_LIST_REMOVE(bif, bif_next); 1198 1199 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1200 } 1201 1202 static int 1203 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1204 { 1205 struct ifbreq *req = arg; 1206 struct bridge_iflist *bif = NULL; 1207 struct ifnet *ifs; 1208 int error = 0; 1209 1210 ifs = ifunit(req->ifbr_ifsname); 1211 if (ifs == NULL) 1212 return (ENOENT); 1213 if (ifs->if_ioctl == NULL) /* must be supported */ 1214 return (EINVAL); 1215 1216 /* If it's in the span list, it can't be a member. */ 1217 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1218 if (ifs == bif->bif_ifp) 1219 return (EBUSY); 1220 1221 if (ifs->if_bridge == sc) 1222 return (EEXIST); 1223 1224 if (ifs->if_bridge != NULL) 1225 return (EBUSY); 1226 1227 switch (ifs->if_type) { 1228 case IFT_ETHER: 1229 case IFT_L2VLAN: 1230 case IFT_GIF: 1231 /* permitted interface types */ 1232 break; 1233 default: 1234 return (EINVAL); 1235 } 1236 1237 #ifdef INET6 1238 /* 1239 * Two valid inet6 addresses with link-local scope must not be 1240 * on the parent interface and the member interfaces at the 1241 * same time. This restriction is needed to prevent violation 1242 * of link-local scope zone. Attempts to add a member 1243 * interface which has inet6 addresses when the parent has 1244 * inet6 triggers removal of all inet6 addresses on the member 1245 * interface. 1246 */ 1247 1248 /* Check if the parent interface has a link-local scope addr. */ 1249 if (V_allow_llz_overlap == 0 && 1250 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1251 /* 1252 * If any, remove all inet6 addresses from the member 1253 * interfaces. 1254 */ 1255 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1256 if (in6ifa_llaonifp(bif->bif_ifp)) { 1257 in6_ifdetach(bif->bif_ifp); 1258 if_printf(sc->sc_ifp, 1259 "IPv6 addresses on %s have been removed " 1260 "before adding it as a member to prevent " 1261 "IPv6 address scope violation.\n", 1262 bif->bif_ifp->if_xname); 1263 } 1264 } 1265 if (in6ifa_llaonifp(ifs)) { 1266 in6_ifdetach(ifs); 1267 if_printf(sc->sc_ifp, 1268 "IPv6 addresses on %s have been removed " 1269 "before adding it as a member to prevent " 1270 "IPv6 address scope violation.\n", 1271 ifs->if_xname); 1272 } 1273 } 1274 #endif 1275 /* Allow the first Ethernet member to define the MTU */ 1276 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1277 sc->sc_ifp->if_mtu = ifs->if_mtu; 1278 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1279 struct ifreq ifr; 1280 1281 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1282 ifs->if_xname); 1283 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1284 1285 error = (*ifs->if_ioctl)(ifs, 1286 SIOCSIFMTU, (caddr_t)&ifr); 1287 if (error != 0) { 1288 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1289 " new member %s\n", sc->sc_ifp->if_xname, 1290 ifr.ifr_mtu, 1291 ifs->if_xname); 1292 return (EINVAL); 1293 } 1294 } 1295 1296 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1297 if (bif == NULL) 1298 return (ENOMEM); 1299 1300 bif->bif_ifp = ifs; 1301 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1302 bif->bif_savedcaps = ifs->if_capenable; 1303 1304 /* 1305 * Assign the interface's MAC address to the bridge if it's the first 1306 * member and the MAC address of the bridge has not been changed from 1307 * the default randomly generated one. 1308 */ 1309 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1310 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1311 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1312 sc->sc_ifaddr = ifs; 1313 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1314 } 1315 1316 ifs->if_bridge = sc; 1317 ifs->if_bridge_output = bridge_output; 1318 ifs->if_bridge_input = bridge_input; 1319 ifs->if_bridge_linkstate = bridge_linkstate; 1320 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1321 /* 1322 * XXX: XLOCK HERE!?! 1323 * 1324 * NOTE: insert_***HEAD*** should be safe for the traversals. 1325 */ 1326 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1327 1328 /* Set interface capabilities to the intersection set of all members */ 1329 bridge_mutecaps(sc); 1330 bridge_linkcheck(sc); 1331 1332 /* Place the interface into promiscuous mode */ 1333 switch (ifs->if_type) { 1334 case IFT_ETHER: 1335 case IFT_L2VLAN: 1336 error = ifpromisc(ifs, 1); 1337 break; 1338 } 1339 1340 if (error) 1341 bridge_delete_member(sc, bif, 0); 1342 return (error); 1343 } 1344 1345 static int 1346 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1347 { 1348 struct ifbreq *req = arg; 1349 struct bridge_iflist *bif; 1350 1351 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1352 if (bif == NULL) 1353 return (ENOENT); 1354 1355 bridge_delete_member(sc, bif, 0); 1356 1357 return (0); 1358 } 1359 1360 static int 1361 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1362 { 1363 struct ifbreq *req = arg; 1364 struct bridge_iflist *bif; 1365 struct bstp_port *bp; 1366 1367 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1368 if (bif == NULL) 1369 return (ENOENT); 1370 1371 bp = &bif->bif_stp; 1372 req->ifbr_ifsflags = bif->bif_flags; 1373 req->ifbr_state = bp->bp_state; 1374 req->ifbr_priority = bp->bp_priority; 1375 req->ifbr_path_cost = bp->bp_path_cost; 1376 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1377 req->ifbr_proto = bp->bp_protover; 1378 req->ifbr_role = bp->bp_role; 1379 req->ifbr_stpflags = bp->bp_flags; 1380 req->ifbr_addrcnt = bif->bif_addrcnt; 1381 req->ifbr_addrmax = bif->bif_addrmax; 1382 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1383 1384 /* Copy STP state options as flags */ 1385 if (bp->bp_operedge) 1386 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1387 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1388 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1389 if (bp->bp_ptp_link) 1390 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1391 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1392 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1393 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1394 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1395 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1396 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1397 return (0); 1398 } 1399 1400 static int 1401 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1402 { 1403 struct epoch_tracker et; 1404 struct ifbreq *req = arg; 1405 struct bridge_iflist *bif; 1406 struct bstp_port *bp; 1407 int error; 1408 1409 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1410 if (bif == NULL) 1411 return (ENOENT); 1412 bp = &bif->bif_stp; 1413 1414 if (req->ifbr_ifsflags & IFBIF_SPAN) 1415 /* SPAN is readonly */ 1416 return (EINVAL); 1417 1418 NET_EPOCH_ENTER(et); 1419 1420 if (req->ifbr_ifsflags & IFBIF_STP) { 1421 if ((bif->bif_flags & IFBIF_STP) == 0) { 1422 error = bstp_enable(&bif->bif_stp); 1423 if (error) { 1424 NET_EPOCH_EXIT(et); 1425 return (error); 1426 } 1427 } 1428 } else { 1429 if ((bif->bif_flags & IFBIF_STP) != 0) 1430 bstp_disable(&bif->bif_stp); 1431 } 1432 1433 /* Pass on STP flags */ 1434 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1435 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1436 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1437 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1438 1439 /* Save the bits relating to the bridge */ 1440 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1441 1442 NET_EPOCH_EXIT(et); 1443 1444 return (0); 1445 } 1446 1447 static int 1448 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1449 { 1450 struct ifbrparam *param = arg; 1451 1452 sc->sc_brtmax = param->ifbrp_csize; 1453 bridge_rttrim(sc); 1454 1455 return (0); 1456 } 1457 1458 static int 1459 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1460 { 1461 struct ifbrparam *param = arg; 1462 1463 param->ifbrp_csize = sc->sc_brtmax; 1464 1465 return (0); 1466 } 1467 1468 static int 1469 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1470 { 1471 struct ifbifconf *bifc = arg; 1472 struct bridge_iflist *bif; 1473 struct ifbreq breq; 1474 char *buf, *outbuf; 1475 int count, buflen, len, error = 0; 1476 1477 count = 0; 1478 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1479 count++; 1480 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1481 count++; 1482 1483 buflen = sizeof(breq) * count; 1484 if (bifc->ifbic_len == 0) { 1485 bifc->ifbic_len = buflen; 1486 return (0); 1487 } 1488 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1489 if (outbuf == NULL) 1490 return (ENOMEM); 1491 1492 count = 0; 1493 buf = outbuf; 1494 len = min(bifc->ifbic_len, buflen); 1495 bzero(&breq, sizeof(breq)); 1496 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1497 if (len < sizeof(breq)) 1498 break; 1499 1500 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1501 sizeof(breq.ifbr_ifsname)); 1502 /* Fill in the ifbreq structure */ 1503 error = bridge_ioctl_gifflags(sc, &breq); 1504 if (error) 1505 break; 1506 memcpy(buf, &breq, sizeof(breq)); 1507 count++; 1508 buf += sizeof(breq); 1509 len -= sizeof(breq); 1510 } 1511 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1512 if (len < sizeof(breq)) 1513 break; 1514 1515 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1516 sizeof(breq.ifbr_ifsname)); 1517 breq.ifbr_ifsflags = bif->bif_flags; 1518 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1519 memcpy(buf, &breq, sizeof(breq)); 1520 count++; 1521 buf += sizeof(breq); 1522 len -= sizeof(breq); 1523 } 1524 1525 bifc->ifbic_len = sizeof(breq) * count; 1526 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1527 free(outbuf, M_TEMP); 1528 return (error); 1529 } 1530 1531 static int 1532 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1533 { 1534 struct ifbaconf *bac = arg; 1535 struct bridge_rtnode *brt; 1536 struct ifbareq bareq; 1537 char *buf, *outbuf; 1538 int count, buflen, len, error = 0; 1539 1540 if (bac->ifbac_len == 0) 1541 return (0); 1542 1543 count = 0; 1544 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1545 count++; 1546 buflen = sizeof(bareq) * count; 1547 1548 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1549 if (outbuf == NULL) 1550 return (ENOMEM); 1551 1552 count = 0; 1553 buf = outbuf; 1554 len = min(bac->ifbac_len, buflen); 1555 bzero(&bareq, sizeof(bareq)); 1556 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1557 if (len < sizeof(bareq)) 1558 goto out; 1559 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1560 sizeof(bareq.ifba_ifsname)); 1561 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1562 bareq.ifba_vlan = brt->brt_vlan; 1563 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1564 time_uptime < brt->brt_expire) 1565 bareq.ifba_expire = brt->brt_expire - time_uptime; 1566 else 1567 bareq.ifba_expire = 0; 1568 bareq.ifba_flags = brt->brt_flags; 1569 1570 memcpy(buf, &bareq, sizeof(bareq)); 1571 count++; 1572 buf += sizeof(bareq); 1573 len -= sizeof(bareq); 1574 } 1575 out: 1576 bac->ifbac_len = sizeof(bareq) * count; 1577 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1578 free(outbuf, M_TEMP); 1579 return (error); 1580 } 1581 1582 static int 1583 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1584 { 1585 struct ifbareq *req = arg; 1586 struct bridge_iflist *bif; 1587 struct epoch_tracker et; 1588 int error; 1589 1590 NET_EPOCH_ENTER(et); 1591 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1592 if (bif == NULL) { 1593 NET_EPOCH_EXIT(et); 1594 return (ENOENT); 1595 } 1596 1597 /* bridge_rtupdate() may acquire the lock. */ 1598 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1599 req->ifba_flags); 1600 NET_EPOCH_EXIT(et); 1601 1602 return (error); 1603 } 1604 1605 static int 1606 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1607 { 1608 struct ifbrparam *param = arg; 1609 1610 sc->sc_brttimeout = param->ifbrp_ctime; 1611 return (0); 1612 } 1613 1614 static int 1615 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1616 { 1617 struct ifbrparam *param = arg; 1618 1619 param->ifbrp_ctime = sc->sc_brttimeout; 1620 return (0); 1621 } 1622 1623 static int 1624 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1625 { 1626 struct ifbareq *req = arg; 1627 1628 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1629 } 1630 1631 static int 1632 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1633 { 1634 struct ifbreq *req = arg; 1635 1636 BRIDGE_RT_LOCK(sc); 1637 bridge_rtflush(sc, req->ifbr_ifsflags); 1638 BRIDGE_RT_UNLOCK(sc); 1639 1640 return (0); 1641 } 1642 1643 static int 1644 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1645 { 1646 struct ifbrparam *param = arg; 1647 struct bstp_state *bs = &sc->sc_stp; 1648 1649 param->ifbrp_prio = bs->bs_bridge_priority; 1650 return (0); 1651 } 1652 1653 static int 1654 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1655 { 1656 struct ifbrparam *param = arg; 1657 1658 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1659 } 1660 1661 static int 1662 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1663 { 1664 struct ifbrparam *param = arg; 1665 struct bstp_state *bs = &sc->sc_stp; 1666 1667 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1668 return (0); 1669 } 1670 1671 static int 1672 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1673 { 1674 struct ifbrparam *param = arg; 1675 1676 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1677 } 1678 1679 static int 1680 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1681 { 1682 struct ifbrparam *param = arg; 1683 struct bstp_state *bs = &sc->sc_stp; 1684 1685 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1686 return (0); 1687 } 1688 1689 static int 1690 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1691 { 1692 struct ifbrparam *param = arg; 1693 1694 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1695 } 1696 1697 static int 1698 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1699 { 1700 struct ifbrparam *param = arg; 1701 struct bstp_state *bs = &sc->sc_stp; 1702 1703 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1704 return (0); 1705 } 1706 1707 static int 1708 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1709 { 1710 struct ifbrparam *param = arg; 1711 1712 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1713 } 1714 1715 static int 1716 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1717 { 1718 struct ifbreq *req = arg; 1719 struct bridge_iflist *bif; 1720 1721 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1722 if (bif == NULL) 1723 return (ENOENT); 1724 1725 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1726 } 1727 1728 static int 1729 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1730 { 1731 struct ifbreq *req = arg; 1732 struct bridge_iflist *bif; 1733 1734 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1735 if (bif == NULL) 1736 return (ENOENT); 1737 1738 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1739 } 1740 1741 static int 1742 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1743 { 1744 struct ifbreq *req = arg; 1745 struct bridge_iflist *bif; 1746 1747 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1748 if (bif == NULL) 1749 return (ENOENT); 1750 1751 bif->bif_addrmax = req->ifbr_addrmax; 1752 return (0); 1753 } 1754 1755 static int 1756 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1757 { 1758 struct ifbreq *req = arg; 1759 struct bridge_iflist *bif = NULL; 1760 struct ifnet *ifs; 1761 1762 ifs = ifunit(req->ifbr_ifsname); 1763 if (ifs == NULL) 1764 return (ENOENT); 1765 1766 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1767 if (ifs == bif->bif_ifp) 1768 return (EBUSY); 1769 1770 if (ifs->if_bridge != NULL) 1771 return (EBUSY); 1772 1773 switch (ifs->if_type) { 1774 case IFT_ETHER: 1775 case IFT_GIF: 1776 case IFT_L2VLAN: 1777 break; 1778 default: 1779 return (EINVAL); 1780 } 1781 1782 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1783 if (bif == NULL) 1784 return (ENOMEM); 1785 1786 bif->bif_ifp = ifs; 1787 bif->bif_flags = IFBIF_SPAN; 1788 1789 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1790 1791 return (0); 1792 } 1793 1794 static int 1795 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1796 { 1797 struct ifbreq *req = arg; 1798 struct bridge_iflist *bif; 1799 struct ifnet *ifs; 1800 1801 ifs = ifunit(req->ifbr_ifsname); 1802 if (ifs == NULL) 1803 return (ENOENT); 1804 1805 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1806 if (ifs == bif->bif_ifp) 1807 break; 1808 1809 if (bif == NULL) 1810 return (ENOENT); 1811 1812 bridge_delete_span(sc, bif); 1813 1814 return (0); 1815 } 1816 1817 static int 1818 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1819 { 1820 struct ifbropreq *req = arg; 1821 struct bstp_state *bs = &sc->sc_stp; 1822 struct bstp_port *root_port; 1823 1824 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1825 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1826 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1827 1828 root_port = bs->bs_root_port; 1829 if (root_port == NULL) 1830 req->ifbop_root_port = 0; 1831 else 1832 req->ifbop_root_port = root_port->bp_ifp->if_index; 1833 1834 req->ifbop_holdcount = bs->bs_txholdcount; 1835 req->ifbop_priority = bs->bs_bridge_priority; 1836 req->ifbop_protocol = bs->bs_protover; 1837 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1838 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1839 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1840 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1841 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1842 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1843 1844 return (0); 1845 } 1846 1847 static int 1848 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1849 { 1850 struct ifbrparam *param = arg; 1851 1852 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1853 return (0); 1854 } 1855 1856 static int 1857 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1858 { 1859 struct ifbpstpconf *bifstp = arg; 1860 struct bridge_iflist *bif; 1861 struct bstp_port *bp; 1862 struct ifbpstpreq bpreq; 1863 char *buf, *outbuf; 1864 int count, buflen, len, error = 0; 1865 1866 count = 0; 1867 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1868 if ((bif->bif_flags & IFBIF_STP) != 0) 1869 count++; 1870 } 1871 1872 buflen = sizeof(bpreq) * count; 1873 if (bifstp->ifbpstp_len == 0) { 1874 bifstp->ifbpstp_len = buflen; 1875 return (0); 1876 } 1877 1878 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1879 if (outbuf == NULL) 1880 return (ENOMEM); 1881 1882 count = 0; 1883 buf = outbuf; 1884 len = min(bifstp->ifbpstp_len, buflen); 1885 bzero(&bpreq, sizeof(bpreq)); 1886 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1887 if (len < sizeof(bpreq)) 1888 break; 1889 1890 if ((bif->bif_flags & IFBIF_STP) == 0) 1891 continue; 1892 1893 bp = &bif->bif_stp; 1894 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1895 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1896 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1897 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1898 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1899 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1900 1901 memcpy(buf, &bpreq, sizeof(bpreq)); 1902 count++; 1903 buf += sizeof(bpreq); 1904 len -= sizeof(bpreq); 1905 } 1906 1907 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1908 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1909 free(outbuf, M_TEMP); 1910 return (error); 1911 } 1912 1913 static int 1914 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1915 { 1916 struct ifbrparam *param = arg; 1917 1918 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1919 } 1920 1921 static int 1922 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1923 { 1924 struct ifbrparam *param = arg; 1925 1926 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1927 } 1928 1929 /* 1930 * bridge_ifdetach: 1931 * 1932 * Detach an interface from a bridge. Called when a member 1933 * interface is detaching. 1934 */ 1935 static void 1936 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1937 { 1938 struct bridge_softc *sc = ifp->if_bridge; 1939 struct bridge_iflist *bif; 1940 1941 if (ifp->if_flags & IFF_RENAMING) 1942 return; 1943 if (V_bridge_cloner == NULL) { 1944 /* 1945 * This detach handler can be called after 1946 * vnet_bridge_uninit(). Just return in that case. 1947 */ 1948 return; 1949 } 1950 /* Check if the interface is a bridge member */ 1951 if (sc != NULL) { 1952 BRIDGE_LOCK(sc); 1953 1954 bif = bridge_lookup_member_if(sc, ifp); 1955 if (bif != NULL) 1956 bridge_delete_member(sc, bif, 1); 1957 1958 BRIDGE_UNLOCK(sc); 1959 return; 1960 } 1961 1962 /* Check if the interface is a span port */ 1963 BRIDGE_LIST_LOCK(); 1964 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1965 BRIDGE_LOCK(sc); 1966 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1967 if (ifp == bif->bif_ifp) { 1968 bridge_delete_span(sc, bif); 1969 break; 1970 } 1971 1972 BRIDGE_UNLOCK(sc); 1973 } 1974 BRIDGE_LIST_UNLOCK(); 1975 } 1976 1977 /* 1978 * bridge_init: 1979 * 1980 * Initialize a bridge interface. 1981 */ 1982 static void 1983 bridge_init(void *xsc) 1984 { 1985 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1986 struct ifnet *ifp = sc->sc_ifp; 1987 1988 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1989 return; 1990 1991 BRIDGE_LOCK(sc); 1992 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1993 bridge_timer, sc); 1994 1995 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1996 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1997 1998 BRIDGE_UNLOCK(sc); 1999 } 2000 2001 /* 2002 * bridge_stop: 2003 * 2004 * Stop the bridge interface. 2005 */ 2006 static void 2007 bridge_stop(struct ifnet *ifp, int disable) 2008 { 2009 struct bridge_softc *sc = ifp->if_softc; 2010 2011 BRIDGE_LOCK_ASSERT(sc); 2012 2013 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2014 return; 2015 2016 BRIDGE_RT_LOCK(sc); 2017 callout_stop(&sc->sc_brcallout); 2018 2019 bstp_stop(&sc->sc_stp); 2020 2021 bridge_rtflush(sc, IFBF_FLUSHDYN); 2022 BRIDGE_RT_UNLOCK(sc); 2023 2024 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2025 } 2026 2027 /* 2028 * bridge_enqueue: 2029 * 2030 * Enqueue a packet on a bridge member interface. 2031 * 2032 */ 2033 static int 2034 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2035 { 2036 int len, err = 0; 2037 short mflags; 2038 struct mbuf *m0; 2039 2040 /* We may be sending a fragment so traverse the mbuf */ 2041 for (; m; m = m0) { 2042 m0 = m->m_nextpkt; 2043 m->m_nextpkt = NULL; 2044 len = m->m_pkthdr.len; 2045 mflags = m->m_flags; 2046 2047 /* 2048 * If underlying interface can not do VLAN tag insertion itself 2049 * then attach a packet tag that holds it. 2050 */ 2051 if ((m->m_flags & M_VLANTAG) && 2052 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2053 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2054 if (m == NULL) { 2055 if_printf(dst_ifp, 2056 "unable to prepend VLAN header\n"); 2057 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2058 continue; 2059 } 2060 m->m_flags &= ~M_VLANTAG; 2061 } 2062 2063 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2064 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2065 m_freem(m0); 2066 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2067 break; 2068 } 2069 2070 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2071 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2072 if (mflags & M_MCAST) 2073 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2074 } 2075 2076 return (err); 2077 } 2078 2079 /* 2080 * bridge_dummynet: 2081 * 2082 * Receive a queued packet from dummynet and pass it on to the output 2083 * interface. 2084 * 2085 * The mbuf has the Ethernet header already attached. 2086 */ 2087 static void 2088 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2089 { 2090 struct bridge_softc *sc; 2091 2092 sc = ifp->if_bridge; 2093 2094 /* 2095 * The packet didnt originate from a member interface. This should only 2096 * ever happen if a member interface is removed while packets are 2097 * queued for it. 2098 */ 2099 if (sc == NULL) { 2100 m_freem(m); 2101 return; 2102 } 2103 2104 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2105 #ifdef INET6 2106 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2107 #endif 2108 ) { 2109 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2110 return; 2111 if (m == NULL) 2112 return; 2113 } 2114 2115 bridge_enqueue(sc, ifp, m); 2116 } 2117 2118 /* 2119 * bridge_output: 2120 * 2121 * Send output from a bridge member interface. This 2122 * performs the bridging function for locally originated 2123 * packets. 2124 * 2125 * The mbuf has the Ethernet header already attached. We must 2126 * enqueue or free the mbuf before returning. 2127 */ 2128 static int 2129 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2130 struct rtentry *rt) 2131 { 2132 struct ether_header *eh; 2133 struct ifnet *bifp, *dst_if; 2134 struct bridge_softc *sc; 2135 uint16_t vlan; 2136 2137 NET_EPOCH_ASSERT(); 2138 2139 if (m->m_len < ETHER_HDR_LEN) { 2140 m = m_pullup(m, ETHER_HDR_LEN); 2141 if (m == NULL) 2142 return (0); 2143 } 2144 2145 eh = mtod(m, struct ether_header *); 2146 sc = ifp->if_bridge; 2147 vlan = VLANTAGOF(m); 2148 2149 bifp = sc->sc_ifp; 2150 2151 /* 2152 * If bridge is down, but the original output interface is up, 2153 * go ahead and send out that interface. Otherwise, the packet 2154 * is dropped below. 2155 */ 2156 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2157 dst_if = ifp; 2158 goto sendunicast; 2159 } 2160 2161 /* 2162 * If the packet is a multicast, or we don't know a better way to 2163 * get there, send to all interfaces. 2164 */ 2165 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2166 dst_if = NULL; 2167 else 2168 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2169 /* Tap any traffic not passing back out the originating interface */ 2170 if (dst_if != ifp) 2171 ETHER_BPF_MTAP(bifp, m); 2172 if (dst_if == NULL) { 2173 struct bridge_iflist *bif; 2174 struct mbuf *mc; 2175 int used = 0; 2176 2177 bridge_span(sc, m); 2178 2179 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2180 dst_if = bif->bif_ifp; 2181 2182 if (dst_if->if_type == IFT_GIF) 2183 continue; 2184 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2185 continue; 2186 2187 /* 2188 * If this is not the original output interface, 2189 * and the interface is participating in spanning 2190 * tree, make sure the port is in a state that 2191 * allows forwarding. 2192 */ 2193 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2194 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2195 continue; 2196 2197 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2198 used = 1; 2199 mc = m; 2200 } else { 2201 mc = m_dup(m, M_NOWAIT); 2202 if (mc == NULL) { 2203 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2204 continue; 2205 } 2206 } 2207 2208 bridge_enqueue(sc, dst_if, mc); 2209 } 2210 if (used == 0) 2211 m_freem(m); 2212 return (0); 2213 } 2214 2215 sendunicast: 2216 /* 2217 * XXX Spanning tree consideration here? 2218 */ 2219 2220 bridge_span(sc, m); 2221 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2222 m_freem(m); 2223 return (0); 2224 } 2225 2226 bridge_enqueue(sc, dst_if, m); 2227 return (0); 2228 } 2229 2230 /* 2231 * bridge_transmit: 2232 * 2233 * Do output on a bridge. 2234 * 2235 */ 2236 static int 2237 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2238 { 2239 struct bridge_softc *sc; 2240 struct ether_header *eh; 2241 struct ifnet *dst_if; 2242 int error = 0; 2243 2244 sc = ifp->if_softc; 2245 2246 ETHER_BPF_MTAP(ifp, m); 2247 2248 eh = mtod(m, struct ether_header *); 2249 2250 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2251 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2252 error = bridge_enqueue(sc, dst_if, m); 2253 } else 2254 bridge_broadcast(sc, ifp, m, 0); 2255 2256 return (error); 2257 } 2258 2259 #ifdef ALTQ 2260 static void 2261 bridge_altq_start(if_t ifp) 2262 { 2263 struct ifaltq *ifq = &ifp->if_snd; 2264 struct mbuf *m; 2265 2266 IFQ_LOCK(ifq); 2267 IFQ_DEQUEUE_NOLOCK(ifq, m); 2268 while (m != NULL) { 2269 bridge_transmit(ifp, m); 2270 IFQ_DEQUEUE_NOLOCK(ifq, m); 2271 } 2272 IFQ_UNLOCK(ifq); 2273 } 2274 2275 static int 2276 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2277 { 2278 int err; 2279 2280 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2281 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2282 if (err == 0) 2283 bridge_altq_start(ifp); 2284 } else 2285 err = bridge_transmit(ifp, m); 2286 2287 return (err); 2288 } 2289 #endif /* ALTQ */ 2290 2291 /* 2292 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2293 */ 2294 static void 2295 bridge_qflush(struct ifnet *ifp __unused) 2296 { 2297 } 2298 2299 /* 2300 * bridge_forward: 2301 * 2302 * The forwarding function of the bridge. 2303 * 2304 * NOTE: Releases the lock on return. 2305 */ 2306 static void 2307 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2308 struct mbuf *m) 2309 { 2310 struct bridge_iflist *dbif; 2311 struct ifnet *src_if, *dst_if, *ifp; 2312 struct ether_header *eh; 2313 uint16_t vlan; 2314 uint8_t *dst; 2315 int error; 2316 2317 NET_EPOCH_ASSERT(); 2318 2319 src_if = m->m_pkthdr.rcvif; 2320 ifp = sc->sc_ifp; 2321 2322 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2323 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2324 vlan = VLANTAGOF(m); 2325 2326 if ((sbif->bif_flags & IFBIF_STP) && 2327 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2328 goto drop; 2329 2330 eh = mtod(m, struct ether_header *); 2331 dst = eh->ether_dhost; 2332 2333 /* If the interface is learning, record the address. */ 2334 if (sbif->bif_flags & IFBIF_LEARNING) { 2335 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2336 sbif, 0, IFBAF_DYNAMIC); 2337 /* 2338 * If the interface has addresses limits then deny any source 2339 * that is not in the cache. 2340 */ 2341 if (error && sbif->bif_addrmax) 2342 goto drop; 2343 } 2344 2345 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2346 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2347 goto drop; 2348 2349 /* 2350 * At this point, the port either doesn't participate 2351 * in spanning tree or it is in the forwarding state. 2352 */ 2353 2354 /* 2355 * If the packet is unicast, destined for someone on 2356 * "this" side of the bridge, drop it. 2357 */ 2358 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2359 dst_if = bridge_rtlookup(sc, dst, vlan); 2360 if (src_if == dst_if) 2361 goto drop; 2362 } else { 2363 /* 2364 * Check if its a reserved multicast address, any address 2365 * listed in 802.1D section 7.12.6 may not be forwarded by the 2366 * bridge. 2367 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2368 */ 2369 if (dst[0] == 0x01 && dst[1] == 0x80 && 2370 dst[2] == 0xc2 && dst[3] == 0x00 && 2371 dst[4] == 0x00 && dst[5] <= 0x0f) 2372 goto drop; 2373 2374 /* ...forward it to all interfaces. */ 2375 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2376 dst_if = NULL; 2377 } 2378 2379 /* 2380 * If we have a destination interface which is a member of our bridge, 2381 * OR this is a unicast packet, push it through the bpf(4) machinery. 2382 * For broadcast or multicast packets, don't bother because it will 2383 * be reinjected into ether_input. We do this before we pass the packets 2384 * through the pfil(9) framework, as it is possible that pfil(9) will 2385 * drop the packet, or possibly modify it, making it difficult to debug 2386 * firewall issues on the bridge. 2387 */ 2388 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2389 ETHER_BPF_MTAP(ifp, m); 2390 2391 /* run the packet filter */ 2392 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2393 #ifdef INET6 2394 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2395 #endif 2396 ) { 2397 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2398 return; 2399 if (m == NULL) 2400 return; 2401 } 2402 2403 if (dst_if == NULL) { 2404 bridge_broadcast(sc, src_if, m, 1); 2405 return; 2406 } 2407 2408 /* 2409 * At this point, we're dealing with a unicast frame 2410 * going to a different interface. 2411 */ 2412 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2413 goto drop; 2414 2415 dbif = bridge_lookup_member_if(sc, dst_if); 2416 if (dbif == NULL) 2417 /* Not a member of the bridge (anymore?) */ 2418 goto drop; 2419 2420 /* Private segments can not talk to each other */ 2421 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2422 goto drop; 2423 2424 if ((dbif->bif_flags & IFBIF_STP) && 2425 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2426 goto drop; 2427 2428 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2429 #ifdef INET6 2430 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2431 #endif 2432 ) { 2433 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2434 return; 2435 if (m == NULL) 2436 return; 2437 } 2438 2439 bridge_enqueue(sc, dst_if, m); 2440 return; 2441 2442 drop: 2443 m_freem(m); 2444 } 2445 2446 /* 2447 * bridge_input: 2448 * 2449 * Receive input from a member interface. Queue the packet for 2450 * bridging if it is not for us. 2451 */ 2452 static struct mbuf * 2453 bridge_input(struct ifnet *ifp, struct mbuf *m) 2454 { 2455 struct bridge_softc *sc = ifp->if_bridge; 2456 struct bridge_iflist *bif, *bif2; 2457 struct ifnet *bifp; 2458 struct ether_header *eh; 2459 struct mbuf *mc, *mc2; 2460 uint16_t vlan; 2461 int error; 2462 2463 NET_EPOCH_ASSERT(); 2464 2465 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2466 return (m); 2467 2468 bifp = sc->sc_ifp; 2469 vlan = VLANTAGOF(m); 2470 2471 /* 2472 * Implement support for bridge monitoring. If this flag has been 2473 * set on this interface, discard the packet once we push it through 2474 * the bpf(4) machinery, but before we do, increment the byte and 2475 * packet counters associated with this interface. 2476 */ 2477 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2478 m->m_pkthdr.rcvif = bifp; 2479 ETHER_BPF_MTAP(bifp, m); 2480 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2481 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2482 m_freem(m); 2483 return (NULL); 2484 } 2485 bif = bridge_lookup_member_if(sc, ifp); 2486 if (bif == NULL) { 2487 return (m); 2488 } 2489 2490 eh = mtod(m, struct ether_header *); 2491 2492 bridge_span(sc, m); 2493 2494 if (m->m_flags & (M_BCAST|M_MCAST)) { 2495 /* Tap off 802.1D packets; they do not get forwarded. */ 2496 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2497 ETHER_ADDR_LEN) == 0) { 2498 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2499 return (NULL); 2500 } 2501 2502 if ((bif->bif_flags & IFBIF_STP) && 2503 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2504 return (m); 2505 } 2506 2507 /* 2508 * Make a deep copy of the packet and enqueue the copy 2509 * for bridge processing; return the original packet for 2510 * local processing. 2511 */ 2512 mc = m_dup(m, M_NOWAIT); 2513 if (mc == NULL) { 2514 return (m); 2515 } 2516 2517 /* Perform the bridge forwarding function with the copy. */ 2518 bridge_forward(sc, bif, mc); 2519 2520 /* 2521 * Reinject the mbuf as arriving on the bridge so we have a 2522 * chance at claiming multicast packets. We can not loop back 2523 * here from ether_input as a bridge is never a member of a 2524 * bridge. 2525 */ 2526 KASSERT(bifp->if_bridge == NULL, 2527 ("loop created in bridge_input")); 2528 mc2 = m_dup(m, M_NOWAIT); 2529 if (mc2 != NULL) { 2530 /* Keep the layer3 header aligned */ 2531 int i = min(mc2->m_pkthdr.len, max_protohdr); 2532 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2533 } 2534 if (mc2 != NULL) { 2535 mc2->m_pkthdr.rcvif = bifp; 2536 (*bifp->if_input)(bifp, mc2); 2537 } 2538 2539 /* Return the original packet for local processing. */ 2540 return (m); 2541 } 2542 2543 if ((bif->bif_flags & IFBIF_STP) && 2544 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2545 return (m); 2546 } 2547 2548 #if (defined(INET) || defined(INET6)) 2549 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2550 || ((iface)->if_carp \ 2551 && (*carp_forus_p)((iface), eh->ether_dhost)) 2552 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2553 || ((iface)->if_carp \ 2554 && (*carp_forus_p)((iface), eh->ether_shost)) 2555 #else 2556 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2557 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2558 #endif 2559 2560 #ifdef INET6 2561 # define OR_PFIL_HOOKED_INET6 \ 2562 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2563 #else 2564 # define OR_PFIL_HOOKED_INET6 2565 #endif 2566 2567 #define GRAB_OUR_PACKETS(iface) \ 2568 if ((iface)->if_type == IFT_GIF) \ 2569 continue; \ 2570 /* It is destined for us. */ \ 2571 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2572 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2573 ) { \ 2574 if (bif->bif_flags & IFBIF_LEARNING) { \ 2575 error = bridge_rtupdate(sc, eh->ether_shost, \ 2576 vlan, bif, 0, IFBAF_DYNAMIC); \ 2577 if (error && bif->bif_addrmax) { \ 2578 m_freem(m); \ 2579 return (NULL); \ 2580 } \ 2581 } \ 2582 m->m_pkthdr.rcvif = iface; \ 2583 if ((iface) == ifp) { \ 2584 /* Skip bridge processing... src == dest */ \ 2585 return (m); \ 2586 } \ 2587 /* It's passing over or to the bridge, locally. */ \ 2588 ETHER_BPF_MTAP(bifp, m); \ 2589 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2590 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2591 /* Filter on the physical interface. */ \ 2592 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \ 2593 OR_PFIL_HOOKED_INET6)) { \ 2594 if (bridge_pfil(&m, NULL, ifp, \ 2595 PFIL_IN) != 0 || m == NULL) { \ 2596 return (NULL); \ 2597 } \ 2598 } \ 2599 if ((iface) != bifp) \ 2600 ETHER_BPF_MTAP(iface, m); \ 2601 return (m); \ 2602 } \ 2603 \ 2604 /* We just received a packet that we sent out. */ \ 2605 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2606 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2607 ) { \ 2608 m_freem(m); \ 2609 return (NULL); \ 2610 } 2611 2612 /* 2613 * Unicast. Make sure it's not for the bridge. 2614 */ 2615 do { GRAB_OUR_PACKETS(bifp) } while (0); 2616 2617 /* 2618 * Give a chance for ifp at first priority. This will help when the 2619 * packet comes through the interface like VLAN's with the same MACs 2620 * on several interfaces from the same bridge. This also will save 2621 * some CPU cycles in case the destination interface and the input 2622 * interface (eq ifp) are the same. 2623 */ 2624 do { GRAB_OUR_PACKETS(ifp) } while (0); 2625 2626 /* Now check the all bridge members. */ 2627 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2628 GRAB_OUR_PACKETS(bif2->bif_ifp) 2629 } 2630 2631 #undef OR_CARP_CHECK_WE_ARE_DST 2632 #undef OR_CARP_CHECK_WE_ARE_SRC 2633 #undef OR_PFIL_HOOKED_INET6 2634 #undef GRAB_OUR_PACKETS 2635 2636 /* Perform the bridge forwarding function. */ 2637 bridge_forward(sc, bif, m); 2638 2639 return (NULL); 2640 } 2641 2642 /* 2643 * bridge_broadcast: 2644 * 2645 * Send a frame to all interfaces that are members of 2646 * the bridge, except for the one on which the packet 2647 * arrived. 2648 * 2649 * NOTE: Releases the lock on return. 2650 */ 2651 static void 2652 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2653 struct mbuf *m, int runfilt) 2654 { 2655 struct bridge_iflist *dbif, *sbif; 2656 struct mbuf *mc; 2657 struct ifnet *dst_if; 2658 int used = 0, i; 2659 2660 NET_EPOCH_ASSERT(); 2661 2662 sbif = bridge_lookup_member_if(sc, src_if); 2663 2664 /* Filter on the bridge interface before broadcasting */ 2665 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2666 #ifdef INET6 2667 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2668 #endif 2669 )) { 2670 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2671 return; 2672 if (m == NULL) 2673 return; 2674 } 2675 2676 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2677 dst_if = dbif->bif_ifp; 2678 if (dst_if == src_if) 2679 continue; 2680 2681 /* Private segments can not talk to each other */ 2682 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2683 continue; 2684 2685 if ((dbif->bif_flags & IFBIF_STP) && 2686 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2687 continue; 2688 2689 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2690 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2691 continue; 2692 2693 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2694 continue; 2695 2696 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2697 mc = m; 2698 used = 1; 2699 } else { 2700 mc = m_dup(m, M_NOWAIT); 2701 if (mc == NULL) { 2702 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2703 continue; 2704 } 2705 } 2706 2707 /* 2708 * Filter on the output interface. Pass a NULL bridge interface 2709 * pointer so we do not redundantly filter on the bridge for 2710 * each interface we broadcast on. 2711 */ 2712 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2713 #ifdef INET6 2714 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2715 #endif 2716 )) { 2717 if (used == 0) { 2718 /* Keep the layer3 header aligned */ 2719 i = min(mc->m_pkthdr.len, max_protohdr); 2720 mc = m_copyup(mc, i, ETHER_ALIGN); 2721 if (mc == NULL) { 2722 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2723 continue; 2724 } 2725 } 2726 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2727 continue; 2728 if (mc == NULL) 2729 continue; 2730 } 2731 2732 bridge_enqueue(sc, dst_if, mc); 2733 } 2734 if (used == 0) 2735 m_freem(m); 2736 } 2737 2738 /* 2739 * bridge_span: 2740 * 2741 * Duplicate a packet out one or more interfaces that are in span mode, 2742 * the original mbuf is unmodified. 2743 */ 2744 static void 2745 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2746 { 2747 struct bridge_iflist *bif; 2748 struct ifnet *dst_if; 2749 struct mbuf *mc; 2750 2751 NET_EPOCH_ASSERT(); 2752 2753 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2754 return; 2755 2756 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2757 dst_if = bif->bif_ifp; 2758 2759 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2760 continue; 2761 2762 mc = m_dup(m, M_NOWAIT); 2763 if (mc == NULL) { 2764 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2765 continue; 2766 } 2767 2768 bridge_enqueue(sc, dst_if, mc); 2769 } 2770 } 2771 2772 /* 2773 * bridge_rtupdate: 2774 * 2775 * Add a bridge routing entry. 2776 */ 2777 static int 2778 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2779 struct bridge_iflist *bif, int setflags, uint8_t flags) 2780 { 2781 struct bridge_rtnode *brt; 2782 int error; 2783 2784 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2785 2786 /* Check the source address is valid and not multicast. */ 2787 if (ETHER_IS_MULTICAST(dst) || 2788 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2789 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2790 return (EINVAL); 2791 2792 /* 802.1p frames map to vlan 1 */ 2793 if (vlan == 0) 2794 vlan = 1; 2795 2796 /* 2797 * A route for this destination might already exist. If so, 2798 * update it, otherwise create a new one. 2799 */ 2800 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2801 BRIDGE_RT_LOCK(sc); 2802 2803 /* Check again, now that we have the lock. There could have 2804 * been a race and we only want to insert this once. */ 2805 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) { 2806 BRIDGE_RT_UNLOCK(sc); 2807 return (0); 2808 } 2809 2810 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2811 sc->sc_brtexceeded++; 2812 BRIDGE_RT_UNLOCK(sc); 2813 return (ENOSPC); 2814 } 2815 /* Check per interface address limits (if enabled) */ 2816 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2817 bif->bif_addrexceeded++; 2818 BRIDGE_RT_UNLOCK(sc); 2819 return (ENOSPC); 2820 } 2821 2822 /* 2823 * Allocate a new bridge forwarding node, and 2824 * initialize the expiration time and Ethernet 2825 * address. 2826 */ 2827 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2828 if (brt == NULL) { 2829 BRIDGE_RT_UNLOCK(sc); 2830 return (ENOMEM); 2831 } 2832 brt->brt_vnet = curvnet; 2833 2834 if (bif->bif_flags & IFBIF_STICKY) 2835 brt->brt_flags = IFBAF_STICKY; 2836 else 2837 brt->brt_flags = IFBAF_DYNAMIC; 2838 2839 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2840 brt->brt_vlan = vlan; 2841 2842 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2843 uma_zfree(V_bridge_rtnode_zone, brt); 2844 BRIDGE_RT_UNLOCK(sc); 2845 return (error); 2846 } 2847 brt->brt_dst = bif; 2848 bif->bif_addrcnt++; 2849 2850 BRIDGE_RT_UNLOCK(sc); 2851 } 2852 2853 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2854 brt->brt_dst != bif) { 2855 BRIDGE_RT_LOCK(sc); 2856 brt->brt_dst->bif_addrcnt--; 2857 brt->brt_dst = bif; 2858 brt->brt_dst->bif_addrcnt++; 2859 BRIDGE_RT_UNLOCK(sc); 2860 } 2861 2862 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2863 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2864 if (setflags) 2865 brt->brt_flags = flags; 2866 2867 return (0); 2868 } 2869 2870 /* 2871 * bridge_rtlookup: 2872 * 2873 * Lookup the destination interface for an address. 2874 */ 2875 static struct ifnet * 2876 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2877 { 2878 struct bridge_rtnode *brt; 2879 2880 NET_EPOCH_ASSERT(); 2881 2882 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2883 return (NULL); 2884 2885 return (brt->brt_ifp); 2886 } 2887 2888 /* 2889 * bridge_rttrim: 2890 * 2891 * Trim the routine table so that we have a number 2892 * of routing entries less than or equal to the 2893 * maximum number. 2894 */ 2895 static void 2896 bridge_rttrim(struct bridge_softc *sc) 2897 { 2898 struct bridge_rtnode *brt, *nbrt; 2899 2900 NET_EPOCH_ASSERT(); 2901 BRIDGE_RT_LOCK_ASSERT(sc); 2902 2903 /* Make sure we actually need to do this. */ 2904 if (sc->sc_brtcnt <= sc->sc_brtmax) 2905 return; 2906 2907 /* Force an aging cycle; this might trim enough addresses. */ 2908 bridge_rtage(sc); 2909 if (sc->sc_brtcnt <= sc->sc_brtmax) 2910 return; 2911 2912 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2913 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2914 bridge_rtnode_destroy(sc, brt); 2915 if (sc->sc_brtcnt <= sc->sc_brtmax) 2916 return; 2917 } 2918 } 2919 } 2920 2921 /* 2922 * bridge_timer: 2923 * 2924 * Aging timer for the bridge. 2925 */ 2926 static void 2927 bridge_timer(void *arg) 2928 { 2929 struct bridge_softc *sc = arg; 2930 2931 BRIDGE_RT_LOCK_ASSERT(sc); 2932 2933 /* Destruction of rtnodes requires a proper vnet context */ 2934 CURVNET_SET(sc->sc_ifp->if_vnet); 2935 bridge_rtage(sc); 2936 2937 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2938 callout_reset(&sc->sc_brcallout, 2939 bridge_rtable_prune_period * hz, bridge_timer, sc); 2940 CURVNET_RESTORE(); 2941 } 2942 2943 /* 2944 * bridge_rtage: 2945 * 2946 * Perform an aging cycle. 2947 */ 2948 static void 2949 bridge_rtage(struct bridge_softc *sc) 2950 { 2951 struct bridge_rtnode *brt, *nbrt; 2952 2953 BRIDGE_RT_LOCK_ASSERT(sc); 2954 2955 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2956 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2957 if (time_uptime >= brt->brt_expire) 2958 bridge_rtnode_destroy(sc, brt); 2959 } 2960 } 2961 } 2962 2963 /* 2964 * bridge_rtflush: 2965 * 2966 * Remove all dynamic addresses from the bridge. 2967 */ 2968 static void 2969 bridge_rtflush(struct bridge_softc *sc, int full) 2970 { 2971 struct bridge_rtnode *brt, *nbrt; 2972 2973 BRIDGE_RT_LOCK_ASSERT(sc); 2974 2975 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2976 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2977 bridge_rtnode_destroy(sc, brt); 2978 } 2979 } 2980 2981 /* 2982 * bridge_rtdaddr: 2983 * 2984 * Remove an address from the table. 2985 */ 2986 static int 2987 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2988 { 2989 struct bridge_rtnode *brt; 2990 int found = 0; 2991 2992 BRIDGE_RT_LOCK(sc); 2993 2994 /* 2995 * If vlan is zero then we want to delete for all vlans so the lookup 2996 * may return more than one. 2997 */ 2998 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2999 bridge_rtnode_destroy(sc, brt); 3000 found = 1; 3001 } 3002 3003 BRIDGE_RT_UNLOCK(sc); 3004 3005 return (found ? 0 : ENOENT); 3006 } 3007 3008 /* 3009 * bridge_rtdelete: 3010 * 3011 * Delete routes to a speicifc member interface. 3012 */ 3013 static void 3014 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3015 { 3016 struct bridge_rtnode *brt, *nbrt; 3017 3018 BRIDGE_RT_LOCK_ASSERT(sc); 3019 3020 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3021 if (brt->brt_ifp == ifp && (full || 3022 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3023 bridge_rtnode_destroy(sc, brt); 3024 } 3025 } 3026 3027 /* 3028 * bridge_rtable_init: 3029 * 3030 * Initialize the route table for this bridge. 3031 */ 3032 static void 3033 bridge_rtable_init(struct bridge_softc *sc) 3034 { 3035 int i; 3036 3037 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3038 M_DEVBUF, M_WAITOK); 3039 3040 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3041 CK_LIST_INIT(&sc->sc_rthash[i]); 3042 3043 sc->sc_rthash_key = arc4random(); 3044 CK_LIST_INIT(&sc->sc_rtlist); 3045 } 3046 3047 /* 3048 * bridge_rtable_fini: 3049 * 3050 * Deconstruct the route table for this bridge. 3051 */ 3052 static void 3053 bridge_rtable_fini(struct bridge_softc *sc) 3054 { 3055 3056 KASSERT(sc->sc_brtcnt == 0, 3057 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3058 free(sc->sc_rthash, M_DEVBUF); 3059 } 3060 3061 /* 3062 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3063 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3064 */ 3065 #define mix(a, b, c) \ 3066 do { \ 3067 a -= b; a -= c; a ^= (c >> 13); \ 3068 b -= c; b -= a; b ^= (a << 8); \ 3069 c -= a; c -= b; c ^= (b >> 13); \ 3070 a -= b; a -= c; a ^= (c >> 12); \ 3071 b -= c; b -= a; b ^= (a << 16); \ 3072 c -= a; c -= b; c ^= (b >> 5); \ 3073 a -= b; a -= c; a ^= (c >> 3); \ 3074 b -= c; b -= a; b ^= (a << 10); \ 3075 c -= a; c -= b; c ^= (b >> 15); \ 3076 } while (/*CONSTCOND*/0) 3077 3078 static __inline uint32_t 3079 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3080 { 3081 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3082 3083 b += addr[5] << 8; 3084 b += addr[4]; 3085 a += addr[3] << 24; 3086 a += addr[2] << 16; 3087 a += addr[1] << 8; 3088 a += addr[0]; 3089 3090 mix(a, b, c); 3091 3092 return (c & BRIDGE_RTHASH_MASK); 3093 } 3094 3095 #undef mix 3096 3097 static int 3098 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3099 { 3100 int i, d; 3101 3102 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3103 d = ((int)a[i]) - ((int)b[i]); 3104 } 3105 3106 return (d); 3107 } 3108 3109 /* 3110 * bridge_rtnode_lookup: 3111 * 3112 * Look up a bridge route node for the specified destination. Compare the 3113 * vlan id or if zero then just return the first match. 3114 */ 3115 static struct bridge_rtnode * 3116 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3117 { 3118 struct bridge_rtnode *brt; 3119 uint32_t hash; 3120 int dir; 3121 3122 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3123 3124 hash = bridge_rthash(sc, addr); 3125 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3126 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3127 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3128 return (brt); 3129 if (dir > 0) 3130 return (NULL); 3131 } 3132 3133 return (NULL); 3134 } 3135 3136 /* 3137 * bridge_rtnode_insert: 3138 * 3139 * Insert the specified bridge node into the route table. We 3140 * assume the entry is not already in the table. 3141 */ 3142 static int 3143 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3144 { 3145 struct bridge_rtnode *lbrt; 3146 uint32_t hash; 3147 int dir; 3148 3149 BRIDGE_RT_LOCK_ASSERT(sc); 3150 3151 hash = bridge_rthash(sc, brt->brt_addr); 3152 3153 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3154 if (lbrt == NULL) { 3155 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3156 goto out; 3157 } 3158 3159 do { 3160 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3161 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3162 return (EEXIST); 3163 if (dir > 0) { 3164 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3165 goto out; 3166 } 3167 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3168 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3169 goto out; 3170 } 3171 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3172 } while (lbrt != NULL); 3173 3174 #ifdef DIAGNOSTIC 3175 panic("bridge_rtnode_insert: impossible"); 3176 #endif 3177 3178 out: 3179 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3180 sc->sc_brtcnt++; 3181 3182 return (0); 3183 } 3184 3185 static void 3186 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3187 { 3188 struct bridge_rtnode *brt; 3189 3190 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3191 3192 CURVNET_SET(brt->brt_vnet); 3193 uma_zfree(V_bridge_rtnode_zone, brt); 3194 CURVNET_RESTORE(); 3195 } 3196 3197 /* 3198 * bridge_rtnode_destroy: 3199 * 3200 * Destroy a bridge rtnode. 3201 */ 3202 static void 3203 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3204 { 3205 BRIDGE_RT_LOCK_ASSERT(sc); 3206 3207 CK_LIST_REMOVE(brt, brt_hash); 3208 3209 CK_LIST_REMOVE(brt, brt_list); 3210 sc->sc_brtcnt--; 3211 brt->brt_dst->bif_addrcnt--; 3212 3213 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3214 } 3215 3216 /* 3217 * bridge_rtable_expire: 3218 * 3219 * Set the expiry time for all routes on an interface. 3220 */ 3221 static void 3222 bridge_rtable_expire(struct ifnet *ifp, int age) 3223 { 3224 struct bridge_softc *sc = ifp->if_bridge; 3225 struct bridge_rtnode *brt; 3226 3227 CURVNET_SET(ifp->if_vnet); 3228 BRIDGE_RT_LOCK(sc); 3229 3230 /* 3231 * If the age is zero then flush, otherwise set all the expiry times to 3232 * age for the interface 3233 */ 3234 if (age == 0) 3235 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3236 else { 3237 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3238 /* Cap the expiry time to 'age' */ 3239 if (brt->brt_ifp == ifp && 3240 brt->brt_expire > time_uptime + age && 3241 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3242 brt->brt_expire = time_uptime + age; 3243 } 3244 } 3245 BRIDGE_RT_UNLOCK(sc); 3246 CURVNET_RESTORE(); 3247 } 3248 3249 /* 3250 * bridge_state_change: 3251 * 3252 * Callback from the bridgestp code when a port changes states. 3253 */ 3254 static void 3255 bridge_state_change(struct ifnet *ifp, int state) 3256 { 3257 struct bridge_softc *sc = ifp->if_bridge; 3258 static const char *stpstates[] = { 3259 "disabled", 3260 "listening", 3261 "learning", 3262 "forwarding", 3263 "blocking", 3264 "discarding" 3265 }; 3266 3267 CURVNET_SET(ifp->if_vnet); 3268 if (V_log_stp) 3269 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3270 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3271 CURVNET_RESTORE(); 3272 } 3273 3274 /* 3275 * Send bridge packets through pfil if they are one of the types pfil can deal 3276 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3277 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3278 * that interface. 3279 */ 3280 static int 3281 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3282 { 3283 int snap, error, i, hlen; 3284 struct ether_header *eh1, eh2; 3285 struct ip *ip; 3286 struct llc llc1; 3287 u_int16_t ether_type; 3288 pfil_return_t rv; 3289 3290 snap = 0; 3291 error = -1; /* Default error if not error == 0 */ 3292 3293 #if 0 3294 /* we may return with the IP fields swapped, ensure its not shared */ 3295 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3296 #endif 3297 3298 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3299 return (0); /* filtering is disabled */ 3300 3301 i = min((*mp)->m_pkthdr.len, max_protohdr); 3302 if ((*mp)->m_len < i) { 3303 *mp = m_pullup(*mp, i); 3304 if (*mp == NULL) { 3305 printf("%s: m_pullup failed\n", __func__); 3306 return (-1); 3307 } 3308 } 3309 3310 eh1 = mtod(*mp, struct ether_header *); 3311 ether_type = ntohs(eh1->ether_type); 3312 3313 /* 3314 * Check for SNAP/LLC. 3315 */ 3316 if (ether_type < ETHERMTU) { 3317 struct llc *llc2 = (struct llc *)(eh1 + 1); 3318 3319 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3320 llc2->llc_dsap == LLC_SNAP_LSAP && 3321 llc2->llc_ssap == LLC_SNAP_LSAP && 3322 llc2->llc_control == LLC_UI) { 3323 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3324 snap = 1; 3325 } 3326 } 3327 3328 /* 3329 * If we're trying to filter bridge traffic, don't look at anything 3330 * other than IP and ARP traffic. If the filter doesn't understand 3331 * IPv6, don't allow IPv6 through the bridge either. This is lame 3332 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3333 * but of course we don't have an AppleTalk filter to begin with. 3334 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3335 * ARP traffic.) 3336 */ 3337 switch (ether_type) { 3338 case ETHERTYPE_ARP: 3339 case ETHERTYPE_REVARP: 3340 if (V_pfil_ipfw_arp == 0) 3341 return (0); /* Automatically pass */ 3342 break; 3343 3344 case ETHERTYPE_IP: 3345 #ifdef INET6 3346 case ETHERTYPE_IPV6: 3347 #endif /* INET6 */ 3348 break; 3349 default: 3350 /* 3351 * Check to see if the user wants to pass non-ip 3352 * packets, these will not be checked by pfil(9) and 3353 * passed unconditionally so the default is to drop. 3354 */ 3355 if (V_pfil_onlyip) 3356 goto bad; 3357 } 3358 3359 /* Run the packet through pfil before stripping link headers */ 3360 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3361 dir == PFIL_OUT && ifp != NULL) { 3362 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) { 3363 case PFIL_DROPPED: 3364 return (EACCES); 3365 case PFIL_CONSUMED: 3366 return (0); 3367 } 3368 } 3369 3370 /* Strip off the Ethernet header and keep a copy. */ 3371 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3372 m_adj(*mp, ETHER_HDR_LEN); 3373 3374 /* Strip off snap header, if present */ 3375 if (snap) { 3376 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3377 m_adj(*mp, sizeof(struct llc)); 3378 } 3379 3380 /* 3381 * Check the IP header for alignment and errors 3382 */ 3383 if (dir == PFIL_IN) { 3384 switch (ether_type) { 3385 case ETHERTYPE_IP: 3386 error = bridge_ip_checkbasic(mp); 3387 break; 3388 #ifdef INET6 3389 case ETHERTYPE_IPV6: 3390 error = bridge_ip6_checkbasic(mp); 3391 break; 3392 #endif /* INET6 */ 3393 default: 3394 error = 0; 3395 } 3396 if (error) 3397 goto bad; 3398 } 3399 3400 error = 0; 3401 3402 /* 3403 * Run the packet through pfil 3404 */ 3405 rv = PFIL_PASS; 3406 switch (ether_type) { 3407 case ETHERTYPE_IP: 3408 /* 3409 * Run pfil on the member interface and the bridge, both can 3410 * be skipped by clearing pfil_member or pfil_bridge. 3411 * 3412 * Keep the order: 3413 * in_if -> bridge_if -> out_if 3414 */ 3415 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3416 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) != 3417 PFIL_PASS) 3418 break; 3419 3420 if (V_pfil_member && ifp != NULL && (rv = 3421 pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) != 3422 PFIL_PASS) 3423 break; 3424 3425 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3426 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) != 3427 PFIL_PASS) 3428 break; 3429 3430 /* check if we need to fragment the packet */ 3431 /* bridge_fragment generates a mbuf chain of packets */ 3432 /* that already include eth headers */ 3433 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3434 i = (*mp)->m_pkthdr.len; 3435 if (i > ifp->if_mtu) { 3436 error = bridge_fragment(ifp, mp, &eh2, snap, 3437 &llc1); 3438 return (error); 3439 } 3440 } 3441 3442 /* Recalculate the ip checksum. */ 3443 ip = mtod(*mp, struct ip *); 3444 hlen = ip->ip_hl << 2; 3445 if (hlen < sizeof(struct ip)) 3446 goto bad; 3447 if (hlen > (*mp)->m_len) { 3448 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3449 goto bad; 3450 ip = mtod(*mp, struct ip *); 3451 if (ip == NULL) 3452 goto bad; 3453 } 3454 ip->ip_sum = 0; 3455 if (hlen == sizeof(struct ip)) 3456 ip->ip_sum = in_cksum_hdr(ip); 3457 else 3458 ip->ip_sum = in_cksum(*mp, hlen); 3459 3460 break; 3461 #ifdef INET6 3462 case ETHERTYPE_IPV6: 3463 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3464 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) != 3465 PFIL_PASS) 3466 break; 3467 3468 if (V_pfil_member && ifp != NULL && (rv = 3469 pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) != 3470 PFIL_PASS) 3471 break; 3472 3473 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3474 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) != 3475 PFIL_PASS) 3476 break; 3477 break; 3478 #endif 3479 } 3480 3481 switch (rv) { 3482 case PFIL_CONSUMED: 3483 return (0); 3484 case PFIL_DROPPED: 3485 return (EACCES); 3486 default: 3487 break; 3488 } 3489 3490 error = -1; 3491 3492 /* 3493 * Finally, put everything back the way it was and return 3494 */ 3495 if (snap) { 3496 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3497 if (*mp == NULL) 3498 return (error); 3499 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3500 } 3501 3502 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3503 if (*mp == NULL) 3504 return (error); 3505 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3506 3507 return (0); 3508 3509 bad: 3510 m_freem(*mp); 3511 *mp = NULL; 3512 return (error); 3513 } 3514 3515 /* 3516 * Perform basic checks on header size since 3517 * pfil assumes ip_input has already processed 3518 * it for it. Cut-and-pasted from ip_input.c. 3519 * Given how simple the IPv6 version is, 3520 * does the IPv4 version really need to be 3521 * this complicated? 3522 * 3523 * XXX Should we update ipstat here, or not? 3524 * XXX Right now we update ipstat but not 3525 * XXX csum_counter. 3526 */ 3527 static int 3528 bridge_ip_checkbasic(struct mbuf **mp) 3529 { 3530 struct mbuf *m = *mp; 3531 struct ip *ip; 3532 int len, hlen; 3533 u_short sum; 3534 3535 if (*mp == NULL) 3536 return (-1); 3537 3538 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3539 if ((m = m_copyup(m, sizeof(struct ip), 3540 (max_linkhdr + 3) & ~3)) == NULL) { 3541 /* XXXJRT new stat, please */ 3542 KMOD_IPSTAT_INC(ips_toosmall); 3543 goto bad; 3544 } 3545 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3546 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3547 KMOD_IPSTAT_INC(ips_toosmall); 3548 goto bad; 3549 } 3550 } 3551 ip = mtod(m, struct ip *); 3552 if (ip == NULL) goto bad; 3553 3554 if (ip->ip_v != IPVERSION) { 3555 KMOD_IPSTAT_INC(ips_badvers); 3556 goto bad; 3557 } 3558 hlen = ip->ip_hl << 2; 3559 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3560 KMOD_IPSTAT_INC(ips_badhlen); 3561 goto bad; 3562 } 3563 if (hlen > m->m_len) { 3564 if ((m = m_pullup(m, hlen)) == NULL) { 3565 KMOD_IPSTAT_INC(ips_badhlen); 3566 goto bad; 3567 } 3568 ip = mtod(m, struct ip *); 3569 if (ip == NULL) goto bad; 3570 } 3571 3572 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3573 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3574 } else { 3575 if (hlen == sizeof(struct ip)) { 3576 sum = in_cksum_hdr(ip); 3577 } else { 3578 sum = in_cksum(m, hlen); 3579 } 3580 } 3581 if (sum) { 3582 KMOD_IPSTAT_INC(ips_badsum); 3583 goto bad; 3584 } 3585 3586 /* Retrieve the packet length. */ 3587 len = ntohs(ip->ip_len); 3588 3589 /* 3590 * Check for additional length bogosity 3591 */ 3592 if (len < hlen) { 3593 KMOD_IPSTAT_INC(ips_badlen); 3594 goto bad; 3595 } 3596 3597 /* 3598 * Check that the amount of data in the buffers 3599 * is as at least much as the IP header would have us expect. 3600 * Drop packet if shorter than we expect. 3601 */ 3602 if (m->m_pkthdr.len < len) { 3603 KMOD_IPSTAT_INC(ips_tooshort); 3604 goto bad; 3605 } 3606 3607 /* Checks out, proceed */ 3608 *mp = m; 3609 return (0); 3610 3611 bad: 3612 *mp = m; 3613 return (-1); 3614 } 3615 3616 #ifdef INET6 3617 /* 3618 * Same as above, but for IPv6. 3619 * Cut-and-pasted from ip6_input.c. 3620 * XXX Should we update ip6stat, or not? 3621 */ 3622 static int 3623 bridge_ip6_checkbasic(struct mbuf **mp) 3624 { 3625 struct mbuf *m = *mp; 3626 struct ip6_hdr *ip6; 3627 3628 /* 3629 * If the IPv6 header is not aligned, slurp it up into a new 3630 * mbuf with space for link headers, in the event we forward 3631 * it. Otherwise, if it is aligned, make sure the entire base 3632 * IPv6 header is in the first mbuf of the chain. 3633 */ 3634 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3635 struct ifnet *inifp = m->m_pkthdr.rcvif; 3636 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3637 (max_linkhdr + 3) & ~3)) == NULL) { 3638 /* XXXJRT new stat, please */ 3639 IP6STAT_INC(ip6s_toosmall); 3640 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3641 goto bad; 3642 } 3643 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3644 struct ifnet *inifp = m->m_pkthdr.rcvif; 3645 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3646 IP6STAT_INC(ip6s_toosmall); 3647 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3648 goto bad; 3649 } 3650 } 3651 3652 ip6 = mtod(m, struct ip6_hdr *); 3653 3654 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3655 IP6STAT_INC(ip6s_badvers); 3656 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3657 goto bad; 3658 } 3659 3660 /* Checks out, proceed */ 3661 *mp = m; 3662 return (0); 3663 3664 bad: 3665 *mp = m; 3666 return (-1); 3667 } 3668 #endif /* INET6 */ 3669 3670 /* 3671 * bridge_fragment: 3672 * 3673 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3674 */ 3675 static int 3676 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3677 int snap, struct llc *llc) 3678 { 3679 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3680 struct ip *ip; 3681 int error = -1; 3682 3683 if (m->m_len < sizeof(struct ip) && 3684 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3685 goto dropit; 3686 ip = mtod(m, struct ip *); 3687 3688 m->m_pkthdr.csum_flags |= CSUM_IP; 3689 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3690 if (error) 3691 goto dropit; 3692 3693 /* 3694 * Walk the chain and re-add the Ethernet header for 3695 * each mbuf packet. 3696 */ 3697 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3698 nextpkt = mcur->m_nextpkt; 3699 mcur->m_nextpkt = NULL; 3700 if (snap) { 3701 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3702 if (mcur == NULL) { 3703 error = ENOBUFS; 3704 if (mprev != NULL) 3705 mprev->m_nextpkt = nextpkt; 3706 goto dropit; 3707 } 3708 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3709 } 3710 3711 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3712 if (mcur == NULL) { 3713 error = ENOBUFS; 3714 if (mprev != NULL) 3715 mprev->m_nextpkt = nextpkt; 3716 goto dropit; 3717 } 3718 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3719 3720 /* 3721 * The previous two M_PREPEND could have inserted one or two 3722 * mbufs in front so we have to update the previous packet's 3723 * m_nextpkt. 3724 */ 3725 mcur->m_nextpkt = nextpkt; 3726 if (mprev != NULL) 3727 mprev->m_nextpkt = mcur; 3728 else { 3729 /* The first mbuf in the original chain needs to be 3730 * updated. */ 3731 *mp = mcur; 3732 } 3733 mprev = mcur; 3734 } 3735 3736 KMOD_IPSTAT_INC(ips_fragmented); 3737 return (error); 3738 3739 dropit: 3740 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3741 m = mcur->m_nextpkt; 3742 m_freem(mcur); 3743 } 3744 return (error); 3745 } 3746 3747 static void 3748 bridge_linkstate(struct ifnet *ifp) 3749 { 3750 struct bridge_softc *sc = ifp->if_bridge; 3751 struct bridge_iflist *bif; 3752 struct epoch_tracker et; 3753 3754 NET_EPOCH_ENTER(et); 3755 3756 bif = bridge_lookup_member_if(sc, ifp); 3757 if (bif == NULL) { 3758 NET_EPOCH_EXIT(et); 3759 return; 3760 } 3761 bridge_linkcheck(sc); 3762 3763 bstp_linkstate(&bif->bif_stp); 3764 3765 NET_EPOCH_EXIT(et); 3766 } 3767 3768 static void 3769 bridge_linkcheck(struct bridge_softc *sc) 3770 { 3771 struct bridge_iflist *bif; 3772 int new_link, hasls; 3773 3774 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3775 3776 new_link = LINK_STATE_DOWN; 3777 hasls = 0; 3778 /* Our link is considered up if at least one of our ports is active */ 3779 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3780 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3781 hasls++; 3782 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3783 new_link = LINK_STATE_UP; 3784 break; 3785 } 3786 } 3787 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3788 /* If no interfaces support link-state then we default to up */ 3789 new_link = LINK_STATE_UP; 3790 } 3791 if_link_state_change(sc->sc_ifp, new_link); 3792 } 3793