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