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) = 0; 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) = 0; 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 int n; 2066 2067 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2068 m0 = m->m_nextpkt; 2069 m_freem(m); 2070 } 2071 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2072 break; 2073 } 2074 2075 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2076 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2077 if (mflags & M_MCAST) 2078 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2079 } 2080 2081 return (err); 2082 } 2083 2084 /* 2085 * bridge_dummynet: 2086 * 2087 * Receive a queued packet from dummynet and pass it on to the output 2088 * interface. 2089 * 2090 * The mbuf has the Ethernet header already attached. 2091 */ 2092 static void 2093 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2094 { 2095 struct bridge_softc *sc; 2096 2097 sc = ifp->if_bridge; 2098 2099 /* 2100 * The packet didnt originate from a member interface. This should only 2101 * ever happen if a member interface is removed while packets are 2102 * queued for it. 2103 */ 2104 if (sc == NULL) { 2105 m_freem(m); 2106 return; 2107 } 2108 2109 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2110 #ifdef INET6 2111 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2112 #endif 2113 ) { 2114 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2115 return; 2116 if (m == NULL) 2117 return; 2118 } 2119 2120 bridge_enqueue(sc, ifp, m); 2121 } 2122 2123 /* 2124 * bridge_output: 2125 * 2126 * Send output from a bridge member interface. This 2127 * performs the bridging function for locally originated 2128 * packets. 2129 * 2130 * The mbuf has the Ethernet header already attached. We must 2131 * enqueue or free the mbuf before returning. 2132 */ 2133 static int 2134 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2135 struct rtentry *rt) 2136 { 2137 struct ether_header *eh; 2138 struct ifnet *bifp, *dst_if; 2139 struct bridge_softc *sc; 2140 uint16_t vlan; 2141 2142 NET_EPOCH_ASSERT(); 2143 2144 if (m->m_len < ETHER_HDR_LEN) { 2145 m = m_pullup(m, ETHER_HDR_LEN); 2146 if (m == NULL) 2147 return (0); 2148 } 2149 2150 eh = mtod(m, struct ether_header *); 2151 sc = ifp->if_bridge; 2152 vlan = VLANTAGOF(m); 2153 2154 bifp = sc->sc_ifp; 2155 2156 /* 2157 * If bridge is down, but the original output interface is up, 2158 * go ahead and send out that interface. Otherwise, the packet 2159 * is dropped below. 2160 */ 2161 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2162 dst_if = ifp; 2163 goto sendunicast; 2164 } 2165 2166 /* 2167 * If the packet is a multicast, or we don't know a better way to 2168 * get there, send to all interfaces. 2169 */ 2170 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2171 dst_if = NULL; 2172 else 2173 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2174 /* Tap any traffic not passing back out the originating interface */ 2175 if (dst_if != ifp) 2176 ETHER_BPF_MTAP(bifp, m); 2177 if (dst_if == NULL) { 2178 struct bridge_iflist *bif; 2179 struct mbuf *mc; 2180 int used = 0; 2181 2182 bridge_span(sc, m); 2183 2184 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2185 dst_if = bif->bif_ifp; 2186 2187 if (dst_if->if_type == IFT_GIF) 2188 continue; 2189 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2190 continue; 2191 2192 /* 2193 * If this is not the original output interface, 2194 * and the interface is participating in spanning 2195 * tree, make sure the port is in a state that 2196 * allows forwarding. 2197 */ 2198 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2199 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2200 continue; 2201 2202 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2203 used = 1; 2204 mc = m; 2205 } else { 2206 mc = m_dup(m, M_NOWAIT); 2207 if (mc == NULL) { 2208 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2209 continue; 2210 } 2211 } 2212 2213 bridge_enqueue(sc, dst_if, mc); 2214 } 2215 if (used == 0) 2216 m_freem(m); 2217 return (0); 2218 } 2219 2220 sendunicast: 2221 /* 2222 * XXX Spanning tree consideration here? 2223 */ 2224 2225 bridge_span(sc, m); 2226 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2227 m_freem(m); 2228 return (0); 2229 } 2230 2231 bridge_enqueue(sc, dst_if, m); 2232 return (0); 2233 } 2234 2235 /* 2236 * bridge_transmit: 2237 * 2238 * Do output on a bridge. 2239 * 2240 */ 2241 static int 2242 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2243 { 2244 struct bridge_softc *sc; 2245 struct ether_header *eh; 2246 struct ifnet *dst_if; 2247 int error = 0; 2248 2249 sc = ifp->if_softc; 2250 2251 ETHER_BPF_MTAP(ifp, m); 2252 2253 eh = mtod(m, struct ether_header *); 2254 2255 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2256 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2257 error = bridge_enqueue(sc, dst_if, m); 2258 } else 2259 bridge_broadcast(sc, ifp, m, 0); 2260 2261 return (error); 2262 } 2263 2264 #ifdef ALTQ 2265 static void 2266 bridge_altq_start(if_t ifp) 2267 { 2268 struct ifaltq *ifq = &ifp->if_snd; 2269 struct mbuf *m; 2270 2271 IFQ_LOCK(ifq); 2272 IFQ_DEQUEUE_NOLOCK(ifq, m); 2273 while (m != NULL) { 2274 bridge_transmit(ifp, m); 2275 IFQ_DEQUEUE_NOLOCK(ifq, m); 2276 } 2277 IFQ_UNLOCK(ifq); 2278 } 2279 2280 static int 2281 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2282 { 2283 int err; 2284 2285 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2286 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2287 if (err == 0) 2288 bridge_altq_start(ifp); 2289 } else 2290 err = bridge_transmit(ifp, m); 2291 2292 return (err); 2293 } 2294 #endif /* ALTQ */ 2295 2296 /* 2297 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2298 */ 2299 static void 2300 bridge_qflush(struct ifnet *ifp __unused) 2301 { 2302 } 2303 2304 /* 2305 * bridge_forward: 2306 * 2307 * The forwarding function of the bridge. 2308 * 2309 * NOTE: Releases the lock on return. 2310 */ 2311 static void 2312 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2313 struct mbuf *m) 2314 { 2315 struct bridge_iflist *dbif; 2316 struct ifnet *src_if, *dst_if, *ifp; 2317 struct ether_header *eh; 2318 uint16_t vlan; 2319 uint8_t *dst; 2320 int error; 2321 2322 NET_EPOCH_ASSERT(); 2323 2324 src_if = m->m_pkthdr.rcvif; 2325 ifp = sc->sc_ifp; 2326 2327 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2328 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2329 vlan = VLANTAGOF(m); 2330 2331 if ((sbif->bif_flags & IFBIF_STP) && 2332 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2333 goto drop; 2334 2335 eh = mtod(m, struct ether_header *); 2336 dst = eh->ether_dhost; 2337 2338 /* If the interface is learning, record the address. */ 2339 if (sbif->bif_flags & IFBIF_LEARNING) { 2340 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2341 sbif, 0, IFBAF_DYNAMIC); 2342 /* 2343 * If the interface has addresses limits then deny any source 2344 * that is not in the cache. 2345 */ 2346 if (error && sbif->bif_addrmax) 2347 goto drop; 2348 } 2349 2350 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2351 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2352 goto drop; 2353 2354 /* 2355 * At this point, the port either doesn't participate 2356 * in spanning tree or it is in the forwarding state. 2357 */ 2358 2359 /* 2360 * If the packet is unicast, destined for someone on 2361 * "this" side of the bridge, drop it. 2362 */ 2363 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2364 dst_if = bridge_rtlookup(sc, dst, vlan); 2365 if (src_if == dst_if) 2366 goto drop; 2367 } else { 2368 /* 2369 * Check if its a reserved multicast address, any address 2370 * listed in 802.1D section 7.12.6 may not be forwarded by the 2371 * bridge. 2372 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2373 */ 2374 if (dst[0] == 0x01 && dst[1] == 0x80 && 2375 dst[2] == 0xc2 && dst[3] == 0x00 && 2376 dst[4] == 0x00 && dst[5] <= 0x0f) 2377 goto drop; 2378 2379 /* ...forward it to all interfaces. */ 2380 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2381 dst_if = NULL; 2382 } 2383 2384 /* 2385 * If we have a destination interface which is a member of our bridge, 2386 * OR this is a unicast packet, push it through the bpf(4) machinery. 2387 * For broadcast or multicast packets, don't bother because it will 2388 * be reinjected into ether_input. We do this before we pass the packets 2389 * through the pfil(9) framework, as it is possible that pfil(9) will 2390 * drop the packet, or possibly modify it, making it difficult to debug 2391 * firewall issues on the bridge. 2392 */ 2393 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2394 ETHER_BPF_MTAP(ifp, m); 2395 2396 /* run the packet filter */ 2397 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2398 #ifdef INET6 2399 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2400 #endif 2401 ) { 2402 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2403 return; 2404 if (m == NULL) 2405 return; 2406 } 2407 2408 if (dst_if == NULL) { 2409 bridge_broadcast(sc, src_if, m, 1); 2410 return; 2411 } 2412 2413 /* 2414 * At this point, we're dealing with a unicast frame 2415 * going to a different interface. 2416 */ 2417 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2418 goto drop; 2419 2420 dbif = bridge_lookup_member_if(sc, dst_if); 2421 if (dbif == NULL) 2422 /* Not a member of the bridge (anymore?) */ 2423 goto drop; 2424 2425 /* Private segments can not talk to each other */ 2426 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2427 goto drop; 2428 2429 if ((dbif->bif_flags & IFBIF_STP) && 2430 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2431 goto drop; 2432 2433 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2434 #ifdef INET6 2435 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2436 #endif 2437 ) { 2438 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2439 return; 2440 if (m == NULL) 2441 return; 2442 } 2443 2444 bridge_enqueue(sc, dst_if, m); 2445 return; 2446 2447 drop: 2448 m_freem(m); 2449 } 2450 2451 /* 2452 * bridge_input: 2453 * 2454 * Receive input from a member interface. Queue the packet for 2455 * bridging if it is not for us. 2456 */ 2457 static struct mbuf * 2458 bridge_input(struct ifnet *ifp, struct mbuf *m) 2459 { 2460 struct bridge_softc *sc = ifp->if_bridge; 2461 struct bridge_iflist *bif, *bif2; 2462 struct ifnet *bifp; 2463 struct ether_header *eh; 2464 struct mbuf *mc, *mc2; 2465 uint16_t vlan; 2466 int error; 2467 2468 NET_EPOCH_ASSERT(); 2469 2470 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2471 return (m); 2472 2473 bifp = sc->sc_ifp; 2474 vlan = VLANTAGOF(m); 2475 2476 /* 2477 * Implement support for bridge monitoring. If this flag has been 2478 * set on this interface, discard the packet once we push it through 2479 * the bpf(4) machinery, but before we do, increment the byte and 2480 * packet counters associated with this interface. 2481 */ 2482 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2483 m->m_pkthdr.rcvif = bifp; 2484 ETHER_BPF_MTAP(bifp, m); 2485 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2486 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2487 m_freem(m); 2488 return (NULL); 2489 } 2490 bif = bridge_lookup_member_if(sc, ifp); 2491 if (bif == NULL) { 2492 return (m); 2493 } 2494 2495 eh = mtod(m, struct ether_header *); 2496 2497 bridge_span(sc, m); 2498 2499 if (m->m_flags & (M_BCAST|M_MCAST)) { 2500 /* Tap off 802.1D packets; they do not get forwarded. */ 2501 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2502 ETHER_ADDR_LEN) == 0) { 2503 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2504 return (NULL); 2505 } 2506 2507 if ((bif->bif_flags & IFBIF_STP) && 2508 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2509 return (m); 2510 } 2511 2512 /* 2513 * Make a deep copy of the packet and enqueue the copy 2514 * for bridge processing; return the original packet for 2515 * local processing. 2516 */ 2517 mc = m_dup(m, M_NOWAIT); 2518 if (mc == NULL) { 2519 return (m); 2520 } 2521 2522 /* Perform the bridge forwarding function with the copy. */ 2523 bridge_forward(sc, bif, mc); 2524 2525 /* 2526 * Reinject the mbuf as arriving on the bridge so we have a 2527 * chance at claiming multicast packets. We can not loop back 2528 * here from ether_input as a bridge is never a member of a 2529 * bridge. 2530 */ 2531 KASSERT(bifp->if_bridge == NULL, 2532 ("loop created in bridge_input")); 2533 mc2 = m_dup(m, M_NOWAIT); 2534 if (mc2 != NULL) { 2535 /* Keep the layer3 header aligned */ 2536 int i = min(mc2->m_pkthdr.len, max_protohdr); 2537 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2538 } 2539 if (mc2 != NULL) { 2540 mc2->m_pkthdr.rcvif = bifp; 2541 (*bifp->if_input)(bifp, mc2); 2542 } 2543 2544 /* Return the original packet for local processing. */ 2545 return (m); 2546 } 2547 2548 if ((bif->bif_flags & IFBIF_STP) && 2549 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2550 return (m); 2551 } 2552 2553 #if (defined(INET) || defined(INET6)) 2554 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2555 || ((iface)->if_carp \ 2556 && (*carp_forus_p)((iface), eh->ether_dhost)) 2557 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2558 || ((iface)->if_carp \ 2559 && (*carp_forus_p)((iface), eh->ether_shost)) 2560 #else 2561 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2562 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2563 #endif 2564 2565 #ifdef INET6 2566 # define OR_PFIL_HOOKED_INET6 \ 2567 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2568 #else 2569 # define OR_PFIL_HOOKED_INET6 2570 #endif 2571 2572 #define GRAB_OUR_PACKETS(iface) \ 2573 if ((iface)->if_type == IFT_GIF) \ 2574 continue; \ 2575 /* It is destined for us. */ \ 2576 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2577 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2578 ) { \ 2579 if (bif->bif_flags & IFBIF_LEARNING) { \ 2580 error = bridge_rtupdate(sc, eh->ether_shost, \ 2581 vlan, bif, 0, IFBAF_DYNAMIC); \ 2582 if (error && bif->bif_addrmax) { \ 2583 m_freem(m); \ 2584 return (NULL); \ 2585 } \ 2586 } \ 2587 m->m_pkthdr.rcvif = iface; \ 2588 if ((iface) == ifp) { \ 2589 /* Skip bridge processing... src == dest */ \ 2590 return (m); \ 2591 } \ 2592 /* It's passing over or to the bridge, locally. */ \ 2593 ETHER_BPF_MTAP(bifp, m); \ 2594 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2595 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2596 /* Filter on the physical interface. */ \ 2597 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \ 2598 OR_PFIL_HOOKED_INET6)) { \ 2599 if (bridge_pfil(&m, NULL, ifp, \ 2600 PFIL_IN) != 0 || m == NULL) { \ 2601 return (NULL); \ 2602 } \ 2603 } \ 2604 if ((iface) != bifp) \ 2605 ETHER_BPF_MTAP(iface, m); \ 2606 return (m); \ 2607 } \ 2608 \ 2609 /* We just received a packet that we sent out. */ \ 2610 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2611 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2612 ) { \ 2613 m_freem(m); \ 2614 return (NULL); \ 2615 } 2616 2617 /* 2618 * Unicast. Make sure it's not for the bridge. 2619 */ 2620 do { GRAB_OUR_PACKETS(bifp) } while (0); 2621 2622 /* 2623 * Give a chance for ifp at first priority. This will help when the 2624 * packet comes through the interface like VLAN's with the same MACs 2625 * on several interfaces from the same bridge. This also will save 2626 * some CPU cycles in case the destination interface and the input 2627 * interface (eq ifp) are the same. 2628 */ 2629 do { GRAB_OUR_PACKETS(ifp) } while (0); 2630 2631 /* Now check the all bridge members. */ 2632 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2633 GRAB_OUR_PACKETS(bif2->bif_ifp) 2634 } 2635 2636 #undef OR_CARP_CHECK_WE_ARE_DST 2637 #undef OR_CARP_CHECK_WE_ARE_SRC 2638 #undef OR_PFIL_HOOKED_INET6 2639 #undef GRAB_OUR_PACKETS 2640 2641 /* Perform the bridge forwarding function. */ 2642 bridge_forward(sc, bif, m); 2643 2644 return (NULL); 2645 } 2646 2647 /* 2648 * bridge_broadcast: 2649 * 2650 * Send a frame to all interfaces that are members of 2651 * the bridge, except for the one on which the packet 2652 * arrived. 2653 * 2654 * NOTE: Releases the lock on return. 2655 */ 2656 static void 2657 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2658 struct mbuf *m, int runfilt) 2659 { 2660 struct bridge_iflist *dbif, *sbif; 2661 struct mbuf *mc; 2662 struct ifnet *dst_if; 2663 int used = 0, i; 2664 2665 NET_EPOCH_ASSERT(); 2666 2667 sbif = bridge_lookup_member_if(sc, src_if); 2668 2669 /* Filter on the bridge interface before broadcasting */ 2670 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2671 #ifdef INET6 2672 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2673 #endif 2674 )) { 2675 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2676 return; 2677 if (m == NULL) 2678 return; 2679 } 2680 2681 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2682 dst_if = dbif->bif_ifp; 2683 if (dst_if == src_if) 2684 continue; 2685 2686 /* Private segments can not talk to each other */ 2687 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2688 continue; 2689 2690 if ((dbif->bif_flags & IFBIF_STP) && 2691 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2692 continue; 2693 2694 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2695 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2696 continue; 2697 2698 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2699 continue; 2700 2701 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2702 mc = m; 2703 used = 1; 2704 } else { 2705 mc = m_dup(m, M_NOWAIT); 2706 if (mc == NULL) { 2707 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2708 continue; 2709 } 2710 } 2711 2712 /* 2713 * Filter on the output interface. Pass a NULL bridge interface 2714 * pointer so we do not redundantly filter on the bridge for 2715 * each interface we broadcast on. 2716 */ 2717 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2718 #ifdef INET6 2719 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2720 #endif 2721 )) { 2722 if (used == 0) { 2723 /* Keep the layer3 header aligned */ 2724 i = min(mc->m_pkthdr.len, max_protohdr); 2725 mc = m_copyup(mc, i, ETHER_ALIGN); 2726 if (mc == NULL) { 2727 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2728 continue; 2729 } 2730 } 2731 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2732 continue; 2733 if (mc == NULL) 2734 continue; 2735 } 2736 2737 bridge_enqueue(sc, dst_if, mc); 2738 } 2739 if (used == 0) 2740 m_freem(m); 2741 } 2742 2743 /* 2744 * bridge_span: 2745 * 2746 * Duplicate a packet out one or more interfaces that are in span mode, 2747 * the original mbuf is unmodified. 2748 */ 2749 static void 2750 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2751 { 2752 struct bridge_iflist *bif; 2753 struct ifnet *dst_if; 2754 struct mbuf *mc; 2755 2756 NET_EPOCH_ASSERT(); 2757 2758 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2759 return; 2760 2761 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2762 dst_if = bif->bif_ifp; 2763 2764 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2765 continue; 2766 2767 mc = m_dup(m, M_NOWAIT); 2768 if (mc == NULL) { 2769 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2770 continue; 2771 } 2772 2773 bridge_enqueue(sc, dst_if, mc); 2774 } 2775 } 2776 2777 /* 2778 * bridge_rtupdate: 2779 * 2780 * Add a bridge routing entry. 2781 */ 2782 static int 2783 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2784 struct bridge_iflist *bif, int setflags, uint8_t flags) 2785 { 2786 struct bridge_rtnode *brt; 2787 int error; 2788 2789 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2790 2791 /* Check the source address is valid and not multicast. */ 2792 if (ETHER_IS_MULTICAST(dst) || 2793 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2794 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2795 return (EINVAL); 2796 2797 /* 802.1p frames map to vlan 1 */ 2798 if (vlan == 0) 2799 vlan = 1; 2800 2801 /* 2802 * A route for this destination might already exist. If so, 2803 * update it, otherwise create a new one. 2804 */ 2805 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2806 BRIDGE_RT_LOCK(sc); 2807 2808 /* Check again, now that we have the lock. There could have 2809 * been a race and we only want to insert this once. */ 2810 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) { 2811 BRIDGE_RT_UNLOCK(sc); 2812 return (0); 2813 } 2814 2815 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2816 sc->sc_brtexceeded++; 2817 BRIDGE_RT_UNLOCK(sc); 2818 return (ENOSPC); 2819 } 2820 /* Check per interface address limits (if enabled) */ 2821 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2822 bif->bif_addrexceeded++; 2823 BRIDGE_RT_UNLOCK(sc); 2824 return (ENOSPC); 2825 } 2826 2827 /* 2828 * Allocate a new bridge forwarding node, and 2829 * initialize the expiration time and Ethernet 2830 * address. 2831 */ 2832 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2833 if (brt == NULL) { 2834 BRIDGE_RT_UNLOCK(sc); 2835 return (ENOMEM); 2836 } 2837 brt->brt_vnet = curvnet; 2838 2839 if (bif->bif_flags & IFBIF_STICKY) 2840 brt->brt_flags = IFBAF_STICKY; 2841 else 2842 brt->brt_flags = IFBAF_DYNAMIC; 2843 2844 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2845 brt->brt_vlan = vlan; 2846 2847 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2848 uma_zfree(V_bridge_rtnode_zone, brt); 2849 BRIDGE_RT_UNLOCK(sc); 2850 return (error); 2851 } 2852 brt->brt_dst = bif; 2853 bif->bif_addrcnt++; 2854 2855 BRIDGE_RT_UNLOCK(sc); 2856 } 2857 2858 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2859 brt->brt_dst != bif) { 2860 BRIDGE_RT_LOCK(sc); 2861 brt->brt_dst->bif_addrcnt--; 2862 brt->brt_dst = bif; 2863 brt->brt_dst->bif_addrcnt++; 2864 BRIDGE_RT_UNLOCK(sc); 2865 } 2866 2867 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2868 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2869 if (setflags) 2870 brt->brt_flags = flags; 2871 2872 return (0); 2873 } 2874 2875 /* 2876 * bridge_rtlookup: 2877 * 2878 * Lookup the destination interface for an address. 2879 */ 2880 static struct ifnet * 2881 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2882 { 2883 struct bridge_rtnode *brt; 2884 2885 NET_EPOCH_ASSERT(); 2886 2887 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2888 return (NULL); 2889 2890 return (brt->brt_ifp); 2891 } 2892 2893 /* 2894 * bridge_rttrim: 2895 * 2896 * Trim the routine table so that we have a number 2897 * of routing entries less than or equal to the 2898 * maximum number. 2899 */ 2900 static void 2901 bridge_rttrim(struct bridge_softc *sc) 2902 { 2903 struct bridge_rtnode *brt, *nbrt; 2904 2905 NET_EPOCH_ASSERT(); 2906 BRIDGE_RT_LOCK_ASSERT(sc); 2907 2908 /* Make sure we actually need to do this. */ 2909 if (sc->sc_brtcnt <= sc->sc_brtmax) 2910 return; 2911 2912 /* Force an aging cycle; this might trim enough addresses. */ 2913 bridge_rtage(sc); 2914 if (sc->sc_brtcnt <= sc->sc_brtmax) 2915 return; 2916 2917 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2918 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2919 bridge_rtnode_destroy(sc, brt); 2920 if (sc->sc_brtcnt <= sc->sc_brtmax) 2921 return; 2922 } 2923 } 2924 } 2925 2926 /* 2927 * bridge_timer: 2928 * 2929 * Aging timer for the bridge. 2930 */ 2931 static void 2932 bridge_timer(void *arg) 2933 { 2934 struct bridge_softc *sc = arg; 2935 2936 BRIDGE_RT_LOCK_ASSERT(sc); 2937 2938 /* Destruction of rtnodes requires a proper vnet context */ 2939 CURVNET_SET(sc->sc_ifp->if_vnet); 2940 bridge_rtage(sc); 2941 2942 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2943 callout_reset(&sc->sc_brcallout, 2944 bridge_rtable_prune_period * hz, bridge_timer, sc); 2945 CURVNET_RESTORE(); 2946 } 2947 2948 /* 2949 * bridge_rtage: 2950 * 2951 * Perform an aging cycle. 2952 */ 2953 static void 2954 bridge_rtage(struct bridge_softc *sc) 2955 { 2956 struct bridge_rtnode *brt, *nbrt; 2957 2958 BRIDGE_RT_LOCK_ASSERT(sc); 2959 2960 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2961 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2962 if (time_uptime >= brt->brt_expire) 2963 bridge_rtnode_destroy(sc, brt); 2964 } 2965 } 2966 } 2967 2968 /* 2969 * bridge_rtflush: 2970 * 2971 * Remove all dynamic addresses from the bridge. 2972 */ 2973 static void 2974 bridge_rtflush(struct bridge_softc *sc, int full) 2975 { 2976 struct bridge_rtnode *brt, *nbrt; 2977 2978 BRIDGE_RT_LOCK_ASSERT(sc); 2979 2980 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2981 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2982 bridge_rtnode_destroy(sc, brt); 2983 } 2984 } 2985 2986 /* 2987 * bridge_rtdaddr: 2988 * 2989 * Remove an address from the table. 2990 */ 2991 static int 2992 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2993 { 2994 struct bridge_rtnode *brt; 2995 int found = 0; 2996 2997 BRIDGE_RT_LOCK(sc); 2998 2999 /* 3000 * If vlan is zero then we want to delete for all vlans so the lookup 3001 * may return more than one. 3002 */ 3003 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3004 bridge_rtnode_destroy(sc, brt); 3005 found = 1; 3006 } 3007 3008 BRIDGE_RT_UNLOCK(sc); 3009 3010 return (found ? 0 : ENOENT); 3011 } 3012 3013 /* 3014 * bridge_rtdelete: 3015 * 3016 * Delete routes to a speicifc member interface. 3017 */ 3018 static void 3019 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3020 { 3021 struct bridge_rtnode *brt, *nbrt; 3022 3023 BRIDGE_RT_LOCK_ASSERT(sc); 3024 3025 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3026 if (brt->brt_ifp == ifp && (full || 3027 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3028 bridge_rtnode_destroy(sc, brt); 3029 } 3030 } 3031 3032 /* 3033 * bridge_rtable_init: 3034 * 3035 * Initialize the route table for this bridge. 3036 */ 3037 static void 3038 bridge_rtable_init(struct bridge_softc *sc) 3039 { 3040 int i; 3041 3042 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3043 M_DEVBUF, M_WAITOK); 3044 3045 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3046 CK_LIST_INIT(&sc->sc_rthash[i]); 3047 3048 sc->sc_rthash_key = arc4random(); 3049 CK_LIST_INIT(&sc->sc_rtlist); 3050 } 3051 3052 /* 3053 * bridge_rtable_fini: 3054 * 3055 * Deconstruct the route table for this bridge. 3056 */ 3057 static void 3058 bridge_rtable_fini(struct bridge_softc *sc) 3059 { 3060 3061 KASSERT(sc->sc_brtcnt == 0, 3062 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3063 free(sc->sc_rthash, M_DEVBUF); 3064 } 3065 3066 /* 3067 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3068 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3069 */ 3070 #define mix(a, b, c) \ 3071 do { \ 3072 a -= b; a -= c; a ^= (c >> 13); \ 3073 b -= c; b -= a; b ^= (a << 8); \ 3074 c -= a; c -= b; c ^= (b >> 13); \ 3075 a -= b; a -= c; a ^= (c >> 12); \ 3076 b -= c; b -= a; b ^= (a << 16); \ 3077 c -= a; c -= b; c ^= (b >> 5); \ 3078 a -= b; a -= c; a ^= (c >> 3); \ 3079 b -= c; b -= a; b ^= (a << 10); \ 3080 c -= a; c -= b; c ^= (b >> 15); \ 3081 } while (/*CONSTCOND*/0) 3082 3083 static __inline uint32_t 3084 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3085 { 3086 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3087 3088 b += addr[5] << 8; 3089 b += addr[4]; 3090 a += addr[3] << 24; 3091 a += addr[2] << 16; 3092 a += addr[1] << 8; 3093 a += addr[0]; 3094 3095 mix(a, b, c); 3096 3097 return (c & BRIDGE_RTHASH_MASK); 3098 } 3099 3100 #undef mix 3101 3102 static int 3103 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3104 { 3105 int i, d; 3106 3107 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3108 d = ((int)a[i]) - ((int)b[i]); 3109 } 3110 3111 return (d); 3112 } 3113 3114 /* 3115 * bridge_rtnode_lookup: 3116 * 3117 * Look up a bridge route node for the specified destination. Compare the 3118 * vlan id or if zero then just return the first match. 3119 */ 3120 static struct bridge_rtnode * 3121 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3122 { 3123 struct bridge_rtnode *brt; 3124 uint32_t hash; 3125 int dir; 3126 3127 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3128 3129 hash = bridge_rthash(sc, addr); 3130 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3131 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3132 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3133 return (brt); 3134 if (dir > 0) 3135 return (NULL); 3136 } 3137 3138 return (NULL); 3139 } 3140 3141 /* 3142 * bridge_rtnode_insert: 3143 * 3144 * Insert the specified bridge node into the route table. We 3145 * assume the entry is not already in the table. 3146 */ 3147 static int 3148 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3149 { 3150 struct bridge_rtnode *lbrt; 3151 uint32_t hash; 3152 int dir; 3153 3154 BRIDGE_RT_LOCK_ASSERT(sc); 3155 3156 hash = bridge_rthash(sc, brt->brt_addr); 3157 3158 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3159 if (lbrt == NULL) { 3160 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3161 goto out; 3162 } 3163 3164 do { 3165 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3166 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3167 return (EEXIST); 3168 if (dir > 0) { 3169 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3170 goto out; 3171 } 3172 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3173 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3174 goto out; 3175 } 3176 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3177 } while (lbrt != NULL); 3178 3179 #ifdef DIAGNOSTIC 3180 panic("bridge_rtnode_insert: impossible"); 3181 #endif 3182 3183 out: 3184 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3185 sc->sc_brtcnt++; 3186 3187 return (0); 3188 } 3189 3190 static void 3191 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3192 { 3193 struct bridge_rtnode *brt; 3194 3195 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3196 3197 CURVNET_SET(brt->brt_vnet); 3198 uma_zfree(V_bridge_rtnode_zone, brt); 3199 CURVNET_RESTORE(); 3200 } 3201 3202 /* 3203 * bridge_rtnode_destroy: 3204 * 3205 * Destroy a bridge rtnode. 3206 */ 3207 static void 3208 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3209 { 3210 BRIDGE_RT_LOCK_ASSERT(sc); 3211 3212 CK_LIST_REMOVE(brt, brt_hash); 3213 3214 CK_LIST_REMOVE(brt, brt_list); 3215 sc->sc_brtcnt--; 3216 brt->brt_dst->bif_addrcnt--; 3217 3218 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3219 } 3220 3221 /* 3222 * bridge_rtable_expire: 3223 * 3224 * Set the expiry time for all routes on an interface. 3225 */ 3226 static void 3227 bridge_rtable_expire(struct ifnet *ifp, int age) 3228 { 3229 struct bridge_softc *sc = ifp->if_bridge; 3230 struct bridge_rtnode *brt; 3231 3232 CURVNET_SET(ifp->if_vnet); 3233 BRIDGE_RT_LOCK(sc); 3234 3235 /* 3236 * If the age is zero then flush, otherwise set all the expiry times to 3237 * age for the interface 3238 */ 3239 if (age == 0) 3240 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3241 else { 3242 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3243 /* Cap the expiry time to 'age' */ 3244 if (brt->brt_ifp == ifp && 3245 brt->brt_expire > time_uptime + age && 3246 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3247 brt->brt_expire = time_uptime + age; 3248 } 3249 } 3250 BRIDGE_RT_UNLOCK(sc); 3251 CURVNET_RESTORE(); 3252 } 3253 3254 /* 3255 * bridge_state_change: 3256 * 3257 * Callback from the bridgestp code when a port changes states. 3258 */ 3259 static void 3260 bridge_state_change(struct ifnet *ifp, int state) 3261 { 3262 struct bridge_softc *sc = ifp->if_bridge; 3263 static const char *stpstates[] = { 3264 "disabled", 3265 "listening", 3266 "learning", 3267 "forwarding", 3268 "blocking", 3269 "discarding" 3270 }; 3271 3272 CURVNET_SET(ifp->if_vnet); 3273 if (V_log_stp) 3274 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3275 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3276 CURVNET_RESTORE(); 3277 } 3278 3279 /* 3280 * Send bridge packets through pfil if they are one of the types pfil can deal 3281 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3282 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3283 * that interface. 3284 */ 3285 static int 3286 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3287 { 3288 int snap, error, i, hlen; 3289 struct ether_header *eh1, eh2; 3290 struct ip *ip; 3291 struct llc llc1; 3292 u_int16_t ether_type; 3293 pfil_return_t rv; 3294 3295 snap = 0; 3296 error = -1; /* Default error if not error == 0 */ 3297 3298 #if 0 3299 /* we may return with the IP fields swapped, ensure its not shared */ 3300 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3301 #endif 3302 3303 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3304 return (0); /* filtering is disabled */ 3305 3306 i = min((*mp)->m_pkthdr.len, max_protohdr); 3307 if ((*mp)->m_len < i) { 3308 *mp = m_pullup(*mp, i); 3309 if (*mp == NULL) { 3310 printf("%s: m_pullup failed\n", __func__); 3311 return (-1); 3312 } 3313 } 3314 3315 eh1 = mtod(*mp, struct ether_header *); 3316 ether_type = ntohs(eh1->ether_type); 3317 3318 /* 3319 * Check for SNAP/LLC. 3320 */ 3321 if (ether_type < ETHERMTU) { 3322 struct llc *llc2 = (struct llc *)(eh1 + 1); 3323 3324 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3325 llc2->llc_dsap == LLC_SNAP_LSAP && 3326 llc2->llc_ssap == LLC_SNAP_LSAP && 3327 llc2->llc_control == LLC_UI) { 3328 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3329 snap = 1; 3330 } 3331 } 3332 3333 /* 3334 * If we're trying to filter bridge traffic, don't look at anything 3335 * other than IP and ARP traffic. If the filter doesn't understand 3336 * IPv6, don't allow IPv6 through the bridge either. This is lame 3337 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3338 * but of course we don't have an AppleTalk filter to begin with. 3339 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3340 * ARP traffic.) 3341 */ 3342 switch (ether_type) { 3343 case ETHERTYPE_ARP: 3344 case ETHERTYPE_REVARP: 3345 if (V_pfil_ipfw_arp == 0) 3346 return (0); /* Automatically pass */ 3347 break; 3348 3349 case ETHERTYPE_IP: 3350 #ifdef INET6 3351 case ETHERTYPE_IPV6: 3352 #endif /* INET6 */ 3353 break; 3354 default: 3355 /* 3356 * Check to see if the user wants to pass non-ip 3357 * packets, these will not be checked by pfil(9) and 3358 * passed unconditionally so the default is to drop. 3359 */ 3360 if (V_pfil_onlyip) 3361 goto bad; 3362 } 3363 3364 /* Run the packet through pfil before stripping link headers */ 3365 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3366 dir == PFIL_OUT && ifp != NULL) { 3367 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) { 3368 case PFIL_DROPPED: 3369 return (EACCES); 3370 case PFIL_CONSUMED: 3371 return (0); 3372 } 3373 } 3374 3375 /* Strip off the Ethernet header and keep a copy. */ 3376 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3377 m_adj(*mp, ETHER_HDR_LEN); 3378 3379 /* Strip off snap header, if present */ 3380 if (snap) { 3381 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3382 m_adj(*mp, sizeof(struct llc)); 3383 } 3384 3385 /* 3386 * Check the IP header for alignment and errors 3387 */ 3388 if (dir == PFIL_IN) { 3389 switch (ether_type) { 3390 case ETHERTYPE_IP: 3391 error = bridge_ip_checkbasic(mp); 3392 break; 3393 #ifdef INET6 3394 case ETHERTYPE_IPV6: 3395 error = bridge_ip6_checkbasic(mp); 3396 break; 3397 #endif /* INET6 */ 3398 default: 3399 error = 0; 3400 } 3401 if (error) 3402 goto bad; 3403 } 3404 3405 error = 0; 3406 3407 /* 3408 * Run the packet through pfil 3409 */ 3410 rv = PFIL_PASS; 3411 switch (ether_type) { 3412 case ETHERTYPE_IP: 3413 /* 3414 * Run pfil on the member interface and the bridge, both can 3415 * be skipped by clearing pfil_member or pfil_bridge. 3416 * 3417 * Keep the order: 3418 * in_if -> bridge_if -> out_if 3419 */ 3420 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3421 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) != 3422 PFIL_PASS) 3423 break; 3424 3425 if (V_pfil_member && ifp != NULL && (rv = 3426 pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) != 3427 PFIL_PASS) 3428 break; 3429 3430 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3431 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) != 3432 PFIL_PASS) 3433 break; 3434 3435 /* check if we need to fragment the packet */ 3436 /* bridge_fragment generates a mbuf chain of packets */ 3437 /* that already include eth headers */ 3438 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3439 i = (*mp)->m_pkthdr.len; 3440 if (i > ifp->if_mtu) { 3441 error = bridge_fragment(ifp, mp, &eh2, snap, 3442 &llc1); 3443 return (error); 3444 } 3445 } 3446 3447 /* Recalculate the ip checksum. */ 3448 ip = mtod(*mp, struct ip *); 3449 hlen = ip->ip_hl << 2; 3450 if (hlen < sizeof(struct ip)) 3451 goto bad; 3452 if (hlen > (*mp)->m_len) { 3453 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3454 goto bad; 3455 ip = mtod(*mp, struct ip *); 3456 if (ip == NULL) 3457 goto bad; 3458 } 3459 ip->ip_sum = 0; 3460 if (hlen == sizeof(struct ip)) 3461 ip->ip_sum = in_cksum_hdr(ip); 3462 else 3463 ip->ip_sum = in_cksum(*mp, hlen); 3464 3465 break; 3466 #ifdef INET6 3467 case ETHERTYPE_IPV6: 3468 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3469 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) != 3470 PFIL_PASS) 3471 break; 3472 3473 if (V_pfil_member && ifp != NULL && (rv = 3474 pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) != 3475 PFIL_PASS) 3476 break; 3477 3478 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3479 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) != 3480 PFIL_PASS) 3481 break; 3482 break; 3483 #endif 3484 } 3485 3486 switch (rv) { 3487 case PFIL_CONSUMED: 3488 return (0); 3489 case PFIL_DROPPED: 3490 return (EACCES); 3491 default: 3492 break; 3493 } 3494 3495 error = -1; 3496 3497 /* 3498 * Finally, put everything back the way it was and return 3499 */ 3500 if (snap) { 3501 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3502 if (*mp == NULL) 3503 return (error); 3504 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3505 } 3506 3507 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3508 if (*mp == NULL) 3509 return (error); 3510 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3511 3512 return (0); 3513 3514 bad: 3515 m_freem(*mp); 3516 *mp = NULL; 3517 return (error); 3518 } 3519 3520 /* 3521 * Perform basic checks on header size since 3522 * pfil assumes ip_input has already processed 3523 * it for it. Cut-and-pasted from ip_input.c. 3524 * Given how simple the IPv6 version is, 3525 * does the IPv4 version really need to be 3526 * this complicated? 3527 * 3528 * XXX Should we update ipstat here, or not? 3529 * XXX Right now we update ipstat but not 3530 * XXX csum_counter. 3531 */ 3532 static int 3533 bridge_ip_checkbasic(struct mbuf **mp) 3534 { 3535 struct mbuf *m = *mp; 3536 struct ip *ip; 3537 int len, hlen; 3538 u_short sum; 3539 3540 if (*mp == NULL) 3541 return (-1); 3542 3543 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3544 if ((m = m_copyup(m, sizeof(struct ip), 3545 (max_linkhdr + 3) & ~3)) == NULL) { 3546 /* XXXJRT new stat, please */ 3547 KMOD_IPSTAT_INC(ips_toosmall); 3548 goto bad; 3549 } 3550 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3551 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3552 KMOD_IPSTAT_INC(ips_toosmall); 3553 goto bad; 3554 } 3555 } 3556 ip = mtod(m, struct ip *); 3557 if (ip == NULL) goto bad; 3558 3559 if (ip->ip_v != IPVERSION) { 3560 KMOD_IPSTAT_INC(ips_badvers); 3561 goto bad; 3562 } 3563 hlen = ip->ip_hl << 2; 3564 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3565 KMOD_IPSTAT_INC(ips_badhlen); 3566 goto bad; 3567 } 3568 if (hlen > m->m_len) { 3569 if ((m = m_pullup(m, hlen)) == NULL) { 3570 KMOD_IPSTAT_INC(ips_badhlen); 3571 goto bad; 3572 } 3573 ip = mtod(m, struct ip *); 3574 if (ip == NULL) goto bad; 3575 } 3576 3577 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3578 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3579 } else { 3580 if (hlen == sizeof(struct ip)) { 3581 sum = in_cksum_hdr(ip); 3582 } else { 3583 sum = in_cksum(m, hlen); 3584 } 3585 } 3586 if (sum) { 3587 KMOD_IPSTAT_INC(ips_badsum); 3588 goto bad; 3589 } 3590 3591 /* Retrieve the packet length. */ 3592 len = ntohs(ip->ip_len); 3593 3594 /* 3595 * Check for additional length bogosity 3596 */ 3597 if (len < hlen) { 3598 KMOD_IPSTAT_INC(ips_badlen); 3599 goto bad; 3600 } 3601 3602 /* 3603 * Check that the amount of data in the buffers 3604 * is as at least much as the IP header would have us expect. 3605 * Drop packet if shorter than we expect. 3606 */ 3607 if (m->m_pkthdr.len < len) { 3608 KMOD_IPSTAT_INC(ips_tooshort); 3609 goto bad; 3610 } 3611 3612 /* Checks out, proceed */ 3613 *mp = m; 3614 return (0); 3615 3616 bad: 3617 *mp = m; 3618 return (-1); 3619 } 3620 3621 #ifdef INET6 3622 /* 3623 * Same as above, but for IPv6. 3624 * Cut-and-pasted from ip6_input.c. 3625 * XXX Should we update ip6stat, or not? 3626 */ 3627 static int 3628 bridge_ip6_checkbasic(struct mbuf **mp) 3629 { 3630 struct mbuf *m = *mp; 3631 struct ip6_hdr *ip6; 3632 3633 /* 3634 * If the IPv6 header is not aligned, slurp it up into a new 3635 * mbuf with space for link headers, in the event we forward 3636 * it. Otherwise, if it is aligned, make sure the entire base 3637 * IPv6 header is in the first mbuf of the chain. 3638 */ 3639 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3640 struct ifnet *inifp = m->m_pkthdr.rcvif; 3641 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3642 (max_linkhdr + 3) & ~3)) == NULL) { 3643 /* XXXJRT new stat, please */ 3644 IP6STAT_INC(ip6s_toosmall); 3645 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3646 goto bad; 3647 } 3648 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3649 struct ifnet *inifp = m->m_pkthdr.rcvif; 3650 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3651 IP6STAT_INC(ip6s_toosmall); 3652 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3653 goto bad; 3654 } 3655 } 3656 3657 ip6 = mtod(m, struct ip6_hdr *); 3658 3659 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3660 IP6STAT_INC(ip6s_badvers); 3661 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3662 goto bad; 3663 } 3664 3665 /* Checks out, proceed */ 3666 *mp = m; 3667 return (0); 3668 3669 bad: 3670 *mp = m; 3671 return (-1); 3672 } 3673 #endif /* INET6 */ 3674 3675 /* 3676 * bridge_fragment: 3677 * 3678 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3679 */ 3680 static int 3681 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3682 int snap, struct llc *llc) 3683 { 3684 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3685 struct ip *ip; 3686 int error = -1; 3687 3688 if (m->m_len < sizeof(struct ip) && 3689 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3690 goto dropit; 3691 ip = mtod(m, struct ip *); 3692 3693 m->m_pkthdr.csum_flags |= CSUM_IP; 3694 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3695 if (error) 3696 goto dropit; 3697 3698 /* 3699 * Walk the chain and re-add the Ethernet header for 3700 * each mbuf packet. 3701 */ 3702 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3703 nextpkt = mcur->m_nextpkt; 3704 mcur->m_nextpkt = NULL; 3705 if (snap) { 3706 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3707 if (mcur == NULL) { 3708 error = ENOBUFS; 3709 if (mprev != NULL) 3710 mprev->m_nextpkt = nextpkt; 3711 goto dropit; 3712 } 3713 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3714 } 3715 3716 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3717 if (mcur == NULL) { 3718 error = ENOBUFS; 3719 if (mprev != NULL) 3720 mprev->m_nextpkt = nextpkt; 3721 goto dropit; 3722 } 3723 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3724 3725 /* 3726 * The previous two M_PREPEND could have inserted one or two 3727 * mbufs in front so we have to update the previous packet's 3728 * m_nextpkt. 3729 */ 3730 mcur->m_nextpkt = nextpkt; 3731 if (mprev != NULL) 3732 mprev->m_nextpkt = mcur; 3733 else { 3734 /* The first mbuf in the original chain needs to be 3735 * updated. */ 3736 *mp = mcur; 3737 } 3738 mprev = mcur; 3739 } 3740 3741 KMOD_IPSTAT_INC(ips_fragmented); 3742 return (error); 3743 3744 dropit: 3745 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3746 m = mcur->m_nextpkt; 3747 m_freem(mcur); 3748 } 3749 return (error); 3750 } 3751 3752 static void 3753 bridge_linkstate(struct ifnet *ifp) 3754 { 3755 struct bridge_softc *sc = ifp->if_bridge; 3756 struct bridge_iflist *bif; 3757 struct epoch_tracker et; 3758 3759 NET_EPOCH_ENTER(et); 3760 3761 bif = bridge_lookup_member_if(sc, ifp); 3762 if (bif == NULL) { 3763 NET_EPOCH_EXIT(et); 3764 return; 3765 } 3766 bridge_linkcheck(sc); 3767 3768 bstp_linkstate(&bif->bif_stp); 3769 3770 NET_EPOCH_EXIT(et); 3771 } 3772 3773 static void 3774 bridge_linkcheck(struct bridge_softc *sc) 3775 { 3776 struct bridge_iflist *bif; 3777 int new_link, hasls; 3778 3779 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3780 3781 new_link = LINK_STATE_DOWN; 3782 hasls = 0; 3783 /* Our link is considered up if at least one of our ports is active */ 3784 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3785 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3786 hasls++; 3787 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3788 new_link = LINK_STATE_UP; 3789 break; 3790 } 3791 } 3792 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3793 /* If no interfaces support link-state then we default to up */ 3794 new_link = LINK_STATE_UP; 3795 } 3796 if_link_state_change(sc->sc_ifp, new_link); 3797 } 3798