1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/if_private.h> 114 #include <net/pfil.h> 115 #include <net/vnet.h> 116 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/in_var.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #ifdef INET6 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/in6_ifattach.h> 126 #endif 127 #if defined(INET) || defined(INET6) 128 #include <netinet/ip_carp.h> 129 #endif 130 #include <machine/in_cksum.h> 131 #include <netinet/if_ether.h> 132 #include <net/bridgestp.h> 133 #include <net/if_bridgevar.h> 134 #include <net/if_llc.h> 135 #include <net/if_vlan_var.h> 136 137 #include <net/route.h> 138 139 /* 140 * Size of the route hash table. Must be a power of two. 141 */ 142 #ifndef BRIDGE_RTHASH_SIZE 143 #define BRIDGE_RTHASH_SIZE 1024 144 #endif 145 146 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 147 148 /* 149 * Default maximum number of addresses to cache. 150 */ 151 #ifndef BRIDGE_RTABLE_MAX 152 #define BRIDGE_RTABLE_MAX 2000 153 #endif 154 155 /* 156 * Timeout (in seconds) for entries learned dynamically. 157 */ 158 #ifndef BRIDGE_RTABLE_TIMEOUT 159 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 160 #endif 161 162 /* 163 * Number of seconds between walks of the route list. 164 */ 165 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 166 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 167 #endif 168 169 /* 170 * List of capabilities to possibly mask on the member interface. 171 */ 172 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 173 IFCAP_TXCSUM_IPV6) 174 175 /* 176 * List of capabilities to strip 177 */ 178 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 179 180 /* 181 * Bridge locking 182 * 183 * The bridge relies heavily on the epoch(9) system to protect its data 184 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 185 * must ensure there is only one writer at a time. 186 * 187 * That is: for read accesses we only need to be in NET_EPOCH, but for write 188 * accesses we must hold: 189 * 190 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 191 * - BRIDGE_LOCK, for any other change 192 * 193 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 194 * calls to bridge member interfaces and these ioctl()s can sleep. 195 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 196 * required while we're in NET_EPOCH and then we're not allowed to sleep. 197 */ 198 #define BRIDGE_LOCK_INIT(_sc) do { \ 199 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 200 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 201 } while (0) 202 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 203 sx_destroy(&(_sc)->sc_sx); \ 204 mtx_destroy(&(_sc)->sc_rt_mtx); \ 205 } while (0) 206 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 207 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 208 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 209 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 210 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 211 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 212 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 213 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 214 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 215 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 216 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 217 218 /* 219 * Bridge interface list entry. 220 */ 221 struct bridge_iflist { 222 CK_LIST_ENTRY(bridge_iflist) bif_next; 223 struct ifnet *bif_ifp; /* member if */ 224 struct bstp_port bif_stp; /* STP state */ 225 uint32_t bif_flags; /* member if flags */ 226 int bif_savedcaps; /* saved capabilities */ 227 uint32_t bif_addrmax; /* max # of addresses */ 228 uint32_t bif_addrcnt; /* cur. # of addresses */ 229 uint32_t bif_addrexceeded;/* # of address violations */ 230 struct epoch_context bif_epoch_ctx; 231 }; 232 233 /* 234 * Bridge route node. 235 */ 236 struct bridge_rtnode { 237 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 238 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 239 struct bridge_iflist *brt_dst; /* destination if */ 240 unsigned long brt_expire; /* expiration time */ 241 uint8_t brt_flags; /* address flags */ 242 uint8_t brt_addr[ETHER_ADDR_LEN]; 243 uint16_t brt_vlan; /* vlan id */ 244 struct vnet *brt_vnet; 245 struct epoch_context brt_epoch_ctx; 246 }; 247 #define brt_ifp brt_dst->bif_ifp 248 249 /* 250 * Software state for each bridge. 251 */ 252 struct bridge_softc { 253 struct ifnet *sc_ifp; /* make this an interface */ 254 LIST_ENTRY(bridge_softc) sc_list; 255 struct sx sc_sx; 256 struct mtx sc_rt_mtx; 257 uint32_t sc_brtmax; /* max # of addresses */ 258 uint32_t sc_brtcnt; /* cur. # of addresses */ 259 uint32_t sc_brttimeout; /* rt timeout in seconds */ 260 struct callout sc_brcallout; /* bridge callout */ 261 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 262 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 263 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 264 uint32_t sc_rthash_key; /* key for hash */ 265 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 266 struct bstp_state sc_stp; /* STP state */ 267 uint32_t sc_brtexceeded; /* # of cache drops */ 268 struct ifnet *sc_ifaddr; /* member mac copied from */ 269 struct ether_addr sc_defaddr; /* Default MAC address */ 270 struct epoch_context sc_epoch_ctx; 271 }; 272 273 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 274 #define V_bridge_list_sx VNET(bridge_list_sx) 275 static eventhandler_tag bridge_detach_cookie; 276 277 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 278 279 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 280 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 281 282 static int bridge_clone_create(struct if_clone *, char *, size_t, 283 struct ifc_data *, struct ifnet **); 284 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 285 286 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 287 static void bridge_mutecaps(struct bridge_softc *); 288 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 289 int); 290 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 291 static void bridge_init(void *); 292 static void bridge_dummynet(struct mbuf *, struct ifnet *); 293 static void bridge_stop(struct ifnet *, int); 294 static int bridge_transmit(struct ifnet *, struct mbuf *); 295 #ifdef ALTQ 296 static void bridge_altq_start(if_t); 297 static int bridge_altq_transmit(if_t, struct mbuf *); 298 #endif 299 static void bridge_qflush(struct ifnet *); 300 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 301 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 302 struct rtentry *); 303 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 304 struct mbuf *); 305 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 306 307 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 308 struct mbuf *m); 309 310 static void bridge_timer(void *); 311 312 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 313 struct mbuf *, int); 314 static void bridge_span(struct bridge_softc *, struct mbuf *); 315 316 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 317 uint16_t, struct bridge_iflist *, int, uint8_t); 318 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 319 uint16_t); 320 static void bridge_rttrim(struct bridge_softc *); 321 static void bridge_rtage(struct bridge_softc *); 322 static void bridge_rtflush(struct bridge_softc *, int); 323 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 324 uint16_t); 325 326 static void bridge_rtable_init(struct bridge_softc *); 327 static void bridge_rtable_fini(struct bridge_softc *); 328 329 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 330 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 331 const uint8_t *, uint16_t); 332 static int bridge_rtnode_insert(struct bridge_softc *, 333 struct bridge_rtnode *); 334 static void bridge_rtnode_destroy(struct bridge_softc *, 335 struct bridge_rtnode *); 336 static void bridge_rtable_expire(struct ifnet *, int); 337 static void bridge_state_change(struct ifnet *, int); 338 339 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 340 const char *name); 341 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 342 struct ifnet *ifp); 343 static void bridge_delete_member(struct bridge_softc *, 344 struct bridge_iflist *, int); 345 static void bridge_delete_span(struct bridge_softc *, 346 struct bridge_iflist *); 347 348 static int bridge_ioctl_add(struct bridge_softc *, void *); 349 static int bridge_ioctl_del(struct bridge_softc *, void *); 350 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 351 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 352 static int bridge_ioctl_scache(struct bridge_softc *, void *); 353 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 354 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 355 static int bridge_ioctl_rts(struct bridge_softc *, void *); 356 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 357 static int bridge_ioctl_sto(struct bridge_softc *, void *); 358 static int bridge_ioctl_gto(struct bridge_softc *, void *); 359 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 360 static int bridge_ioctl_flush(struct bridge_softc *, void *); 361 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 362 static int bridge_ioctl_spri(struct bridge_softc *, void *); 363 static int bridge_ioctl_ght(struct bridge_softc *, void *); 364 static int bridge_ioctl_sht(struct bridge_softc *, void *); 365 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 366 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 367 static int bridge_ioctl_gma(struct bridge_softc *, void *); 368 static int bridge_ioctl_sma(struct bridge_softc *, void *); 369 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 370 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 371 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 372 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 373 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 374 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 375 static int bridge_ioctl_grte(struct bridge_softc *, void *); 376 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 377 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 378 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 379 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 380 int); 381 static int bridge_ip_checkbasic(struct mbuf **mp); 382 #ifdef INET6 383 static int bridge_ip6_checkbasic(struct mbuf **mp); 384 #endif /* INET6 */ 385 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 386 struct ether_header *, int, struct llc *); 387 static void bridge_linkstate(struct ifnet *ifp); 388 static void bridge_linkcheck(struct bridge_softc *sc); 389 390 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 391 #define VLANTAGOF(_m) \ 392 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 393 394 static struct bstp_cb_ops bridge_ops = { 395 .bcb_state = bridge_state_change, 396 .bcb_rtage = bridge_rtable_expire 397 }; 398 399 SYSCTL_DECL(_net_link); 400 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 401 "Bridge"); 402 403 /* only pass IP[46] packets when pfil is enabled */ 404 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 405 #define V_pfil_onlyip VNET(pfil_onlyip) 406 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 407 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 408 "Only pass IP packets when pfil is enabled"); 409 410 /* run pfil hooks on the bridge interface */ 411 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 412 #define V_pfil_bridge VNET(pfil_bridge) 413 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 414 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 415 "Packet filter on the bridge interface"); 416 417 /* layer2 filter with ipfw */ 418 VNET_DEFINE_STATIC(int, pfil_ipfw); 419 #define V_pfil_ipfw VNET(pfil_ipfw) 420 421 /* layer2 ARP filter with ipfw */ 422 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 423 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 424 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 425 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 426 "Filter ARP packets through IPFW layer2"); 427 428 /* run pfil hooks on the member interface */ 429 VNET_DEFINE_STATIC(int, pfil_member) = 0; 430 #define V_pfil_member VNET(pfil_member) 431 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 432 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 433 "Packet filter on the member interface"); 434 435 /* run pfil hooks on the physical interface for locally destined packets */ 436 VNET_DEFINE_STATIC(int, pfil_local_phys); 437 #define V_pfil_local_phys VNET(pfil_local_phys) 438 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 439 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 440 "Packet filter on the physical interface for locally destined packets"); 441 442 /* log STP state changes */ 443 VNET_DEFINE_STATIC(int, log_stp); 444 #define V_log_stp VNET(log_stp) 445 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 446 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 447 "Log STP state changes"); 448 449 /* share MAC with first bridge member */ 450 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 451 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 452 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 453 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 454 "Inherit MAC address from the first bridge member"); 455 456 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 457 #define V_allow_llz_overlap VNET(allow_llz_overlap) 458 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 459 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 460 "Allow overlap of link-local scope " 461 "zones of a bridge interface and the member interfaces"); 462 463 /* log MAC address port flapping */ 464 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 465 #define V_log_mac_flap VNET(log_mac_flap) 466 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 467 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 468 "Log MAC address port flapping"); 469 470 VNET_DEFINE_STATIC(int, log_interval) = 5; 471 VNET_DEFINE_STATIC(int, log_count) = 0; 472 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 473 474 #define V_log_interval VNET(log_interval) 475 #define V_log_count VNET(log_count) 476 #define V_log_last VNET(log_last) 477 478 struct bridge_control { 479 int (*bc_func)(struct bridge_softc *, void *); 480 int bc_argsize; 481 int bc_flags; 482 }; 483 484 #define BC_F_COPYIN 0x01 /* copy arguments in */ 485 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 486 #define BC_F_SUSER 0x04 /* do super-user check */ 487 488 static const struct bridge_control bridge_control_table[] = { 489 { bridge_ioctl_add, sizeof(struct ifbreq), 490 BC_F_COPYIN|BC_F_SUSER }, 491 { bridge_ioctl_del, sizeof(struct ifbreq), 492 BC_F_COPYIN|BC_F_SUSER }, 493 494 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 495 BC_F_COPYIN|BC_F_COPYOUT }, 496 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 497 BC_F_COPYIN|BC_F_SUSER }, 498 499 { bridge_ioctl_scache, sizeof(struct ifbrparam), 500 BC_F_COPYIN|BC_F_SUSER }, 501 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 502 BC_F_COPYOUT }, 503 504 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 505 BC_F_COPYIN|BC_F_COPYOUT }, 506 { bridge_ioctl_rts, sizeof(struct ifbaconf), 507 BC_F_COPYIN|BC_F_COPYOUT }, 508 509 { bridge_ioctl_saddr, sizeof(struct ifbareq), 510 BC_F_COPYIN|BC_F_SUSER }, 511 512 { bridge_ioctl_sto, sizeof(struct ifbrparam), 513 BC_F_COPYIN|BC_F_SUSER }, 514 { bridge_ioctl_gto, sizeof(struct ifbrparam), 515 BC_F_COPYOUT }, 516 517 { bridge_ioctl_daddr, sizeof(struct ifbareq), 518 BC_F_COPYIN|BC_F_SUSER }, 519 520 { bridge_ioctl_flush, sizeof(struct ifbreq), 521 BC_F_COPYIN|BC_F_SUSER }, 522 523 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 524 BC_F_COPYOUT }, 525 { bridge_ioctl_spri, sizeof(struct ifbrparam), 526 BC_F_COPYIN|BC_F_SUSER }, 527 528 { bridge_ioctl_ght, sizeof(struct ifbrparam), 529 BC_F_COPYOUT }, 530 { bridge_ioctl_sht, sizeof(struct ifbrparam), 531 BC_F_COPYIN|BC_F_SUSER }, 532 533 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 534 BC_F_COPYOUT }, 535 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 536 BC_F_COPYIN|BC_F_SUSER }, 537 538 { bridge_ioctl_gma, sizeof(struct ifbrparam), 539 BC_F_COPYOUT }, 540 { bridge_ioctl_sma, sizeof(struct ifbrparam), 541 BC_F_COPYIN|BC_F_SUSER }, 542 543 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 544 BC_F_COPYIN|BC_F_SUSER }, 545 546 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 547 BC_F_COPYIN|BC_F_SUSER }, 548 549 { bridge_ioctl_addspan, sizeof(struct ifbreq), 550 BC_F_COPYIN|BC_F_SUSER }, 551 { bridge_ioctl_delspan, sizeof(struct ifbreq), 552 BC_F_COPYIN|BC_F_SUSER }, 553 554 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 555 BC_F_COPYOUT }, 556 557 { bridge_ioctl_grte, sizeof(struct ifbrparam), 558 BC_F_COPYOUT }, 559 560 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 561 BC_F_COPYIN|BC_F_COPYOUT }, 562 563 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 564 BC_F_COPYIN|BC_F_SUSER }, 565 566 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 567 BC_F_COPYIN|BC_F_SUSER }, 568 569 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 570 BC_F_COPYIN|BC_F_SUSER }, 571 572 }; 573 static const int bridge_control_table_size = nitems(bridge_control_table); 574 575 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 576 #define V_bridge_list VNET(bridge_list) 577 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 578 "if_bridge list") 579 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 580 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 581 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 582 583 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 584 #define V_bridge_cloner VNET(bridge_cloner) 585 586 static const char bridge_name[] = "bridge"; 587 588 static void 589 vnet_bridge_init(const void *unused __unused) 590 { 591 592 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 593 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 594 UMA_ALIGN_PTR, 0); 595 BRIDGE_LIST_LOCK_INIT(); 596 LIST_INIT(&V_bridge_list); 597 598 struct if_clone_addreq req = { 599 .create_f = bridge_clone_create, 600 .destroy_f = bridge_clone_destroy, 601 .flags = IFC_F_AUTOUNIT, 602 }; 603 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 604 } 605 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 606 vnet_bridge_init, NULL); 607 608 static void 609 vnet_bridge_uninit(const void *unused __unused) 610 { 611 612 ifc_detach_cloner(V_bridge_cloner); 613 V_bridge_cloner = NULL; 614 BRIDGE_LIST_LOCK_DESTROY(); 615 616 /* Callbacks may use the UMA zone. */ 617 NET_EPOCH_DRAIN_CALLBACKS(); 618 619 uma_zdestroy(V_bridge_rtnode_zone); 620 } 621 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 622 vnet_bridge_uninit, NULL); 623 624 static int 625 bridge_modevent(module_t mod, int type, void *data) 626 { 627 628 switch (type) { 629 case MOD_LOAD: 630 bridge_dn_p = bridge_dummynet; 631 bridge_detach_cookie = EVENTHANDLER_REGISTER( 632 ifnet_departure_event, bridge_ifdetach, NULL, 633 EVENTHANDLER_PRI_ANY); 634 break; 635 case MOD_UNLOAD: 636 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 637 bridge_detach_cookie); 638 bridge_dn_p = NULL; 639 break; 640 default: 641 return (EOPNOTSUPP); 642 } 643 return (0); 644 } 645 646 static moduledata_t bridge_mod = { 647 "if_bridge", 648 bridge_modevent, 649 0 650 }; 651 652 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 653 MODULE_VERSION(if_bridge, 1); 654 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 655 656 /* 657 * handler for net.link.bridge.ipfw 658 */ 659 static int 660 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 661 { 662 int enable = V_pfil_ipfw; 663 int error; 664 665 error = sysctl_handle_int(oidp, &enable, 0, req); 666 enable &= 1; 667 668 if (enable != V_pfil_ipfw) { 669 V_pfil_ipfw = enable; 670 671 /* 672 * Disable pfil so that ipfw doesnt run twice, if the user 673 * really wants both then they can re-enable pfil_bridge and/or 674 * pfil_member. Also allow non-ip packets as ipfw can filter by 675 * layer2 type. 676 */ 677 if (V_pfil_ipfw) { 678 V_pfil_onlyip = 0; 679 V_pfil_bridge = 0; 680 V_pfil_member = 0; 681 } 682 } 683 684 return (error); 685 } 686 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 687 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 688 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 689 "Layer2 filter with IPFW"); 690 691 #ifdef VIMAGE 692 static void 693 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 694 { 695 struct bridge_softc *sc = ifp->if_softc; 696 struct bridge_iflist *bif; 697 698 BRIDGE_LOCK(sc); 699 700 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 701 bridge_delete_member(sc, bif, 0); 702 703 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 704 bridge_delete_span(sc, bif); 705 } 706 707 BRIDGE_UNLOCK(sc); 708 709 ether_reassign(ifp, newvnet, arg); 710 } 711 #endif 712 713 /* 714 * bridge_clone_create: 715 * 716 * Create a new bridge instance. 717 */ 718 static int 719 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 720 struct ifc_data *ifd, struct ifnet **ifpp) 721 { 722 struct bridge_softc *sc; 723 struct ifnet *ifp; 724 725 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 726 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 727 if (ifp == NULL) { 728 free(sc, M_DEVBUF); 729 return (ENOSPC); 730 } 731 732 BRIDGE_LOCK_INIT(sc); 733 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 734 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 735 736 /* Initialize our routing table. */ 737 bridge_rtable_init(sc); 738 739 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 740 741 CK_LIST_INIT(&sc->sc_iflist); 742 CK_LIST_INIT(&sc->sc_spanlist); 743 744 ifp->if_softc = sc; 745 if_initname(ifp, bridge_name, ifd->unit); 746 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 747 ifp->if_ioctl = bridge_ioctl; 748 #ifdef ALTQ 749 ifp->if_start = bridge_altq_start; 750 ifp->if_transmit = bridge_altq_transmit; 751 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 752 ifp->if_snd.ifq_drv_maxlen = 0; 753 IFQ_SET_READY(&ifp->if_snd); 754 #else 755 ifp->if_transmit = bridge_transmit; 756 #endif 757 ifp->if_qflush = bridge_qflush; 758 ifp->if_init = bridge_init; 759 ifp->if_type = IFT_BRIDGE; 760 761 ether_gen_addr(ifp, &sc->sc_defaddr); 762 763 bstp_attach(&sc->sc_stp, &bridge_ops); 764 ether_ifattach(ifp, sc->sc_defaddr.octet); 765 /* Now undo some of the damage... */ 766 ifp->if_baudrate = 0; 767 ifp->if_type = IFT_BRIDGE; 768 #ifdef VIMAGE 769 ifp->if_reassign = bridge_reassign; 770 #endif 771 772 BRIDGE_LIST_LOCK(); 773 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 774 BRIDGE_LIST_UNLOCK(); 775 *ifpp = ifp; 776 777 return (0); 778 } 779 780 static void 781 bridge_clone_destroy_cb(struct epoch_context *ctx) 782 { 783 struct bridge_softc *sc; 784 785 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 786 787 BRIDGE_LOCK_DESTROY(sc); 788 free(sc, M_DEVBUF); 789 } 790 791 /* 792 * bridge_clone_destroy: 793 * 794 * Destroy a bridge instance. 795 */ 796 static int 797 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 798 { 799 struct bridge_softc *sc = ifp->if_softc; 800 struct bridge_iflist *bif; 801 struct epoch_tracker et; 802 803 BRIDGE_LOCK(sc); 804 805 bridge_stop(ifp, 1); 806 ifp->if_flags &= ~IFF_UP; 807 808 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 809 bridge_delete_member(sc, bif, 0); 810 811 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 812 bridge_delete_span(sc, bif); 813 } 814 815 /* Tear down the routing table. */ 816 bridge_rtable_fini(sc); 817 818 BRIDGE_UNLOCK(sc); 819 820 NET_EPOCH_ENTER(et); 821 822 callout_drain(&sc->sc_brcallout); 823 824 BRIDGE_LIST_LOCK(); 825 LIST_REMOVE(sc, sc_list); 826 BRIDGE_LIST_UNLOCK(); 827 828 bstp_detach(&sc->sc_stp); 829 #ifdef ALTQ 830 IFQ_PURGE(&ifp->if_snd); 831 #endif 832 NET_EPOCH_EXIT(et); 833 834 ether_ifdetach(ifp); 835 if_free(ifp); 836 837 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 838 839 return (0); 840 } 841 842 /* 843 * bridge_ioctl: 844 * 845 * Handle a control request from the operator. 846 */ 847 static int 848 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 849 { 850 struct bridge_softc *sc = ifp->if_softc; 851 struct ifreq *ifr = (struct ifreq *)data; 852 struct bridge_iflist *bif; 853 struct thread *td = curthread; 854 union { 855 struct ifbreq ifbreq; 856 struct ifbifconf ifbifconf; 857 struct ifbareq ifbareq; 858 struct ifbaconf ifbaconf; 859 struct ifbrparam ifbrparam; 860 struct ifbropreq ifbropreq; 861 } args; 862 struct ifdrv *ifd = (struct ifdrv *) data; 863 const struct bridge_control *bc; 864 int error = 0, oldmtu; 865 866 BRIDGE_LOCK(sc); 867 868 switch (cmd) { 869 case SIOCADDMULTI: 870 case SIOCDELMULTI: 871 break; 872 873 case SIOCGDRVSPEC: 874 case SIOCSDRVSPEC: 875 if (ifd->ifd_cmd >= bridge_control_table_size) { 876 error = EINVAL; 877 break; 878 } 879 bc = &bridge_control_table[ifd->ifd_cmd]; 880 881 if (cmd == SIOCGDRVSPEC && 882 (bc->bc_flags & BC_F_COPYOUT) == 0) { 883 error = EINVAL; 884 break; 885 } 886 else if (cmd == SIOCSDRVSPEC && 887 (bc->bc_flags & BC_F_COPYOUT) != 0) { 888 error = EINVAL; 889 break; 890 } 891 892 if (bc->bc_flags & BC_F_SUSER) { 893 error = priv_check(td, PRIV_NET_BRIDGE); 894 if (error) 895 break; 896 } 897 898 if (ifd->ifd_len != bc->bc_argsize || 899 ifd->ifd_len > sizeof(args)) { 900 error = EINVAL; 901 break; 902 } 903 904 bzero(&args, sizeof(args)); 905 if (bc->bc_flags & BC_F_COPYIN) { 906 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 907 if (error) 908 break; 909 } 910 911 oldmtu = ifp->if_mtu; 912 error = (*bc->bc_func)(sc, &args); 913 if (error) 914 break; 915 916 /* 917 * Bridge MTU may change during addition of the first port. 918 * If it did, do network layer specific procedure. 919 */ 920 if (ifp->if_mtu != oldmtu) 921 if_notifymtu(ifp); 922 923 if (bc->bc_flags & BC_F_COPYOUT) 924 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 925 926 break; 927 928 case SIOCSIFFLAGS: 929 if (!(ifp->if_flags & IFF_UP) && 930 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 931 /* 932 * If interface is marked down and it is running, 933 * then stop and disable it. 934 */ 935 bridge_stop(ifp, 1); 936 } else if ((ifp->if_flags & IFF_UP) && 937 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 938 /* 939 * If interface is marked up and it is stopped, then 940 * start it. 941 */ 942 BRIDGE_UNLOCK(sc); 943 (*ifp->if_init)(sc); 944 BRIDGE_LOCK(sc); 945 } 946 break; 947 948 case SIOCSIFMTU: 949 oldmtu = sc->sc_ifp->if_mtu; 950 951 if (ifr->ifr_mtu < 576) { 952 error = EINVAL; 953 break; 954 } 955 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 956 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 957 break; 958 } 959 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 960 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 961 SIOCSIFMTU, (caddr_t)ifr); 962 if (error != 0) { 963 log(LOG_NOTICE, "%s: invalid MTU: %u for" 964 " member %s\n", sc->sc_ifp->if_xname, 965 ifr->ifr_mtu, 966 bif->bif_ifp->if_xname); 967 error = EINVAL; 968 break; 969 } 970 } 971 if (error) { 972 /* Restore the previous MTU on all member interfaces. */ 973 ifr->ifr_mtu = oldmtu; 974 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 975 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 976 SIOCSIFMTU, (caddr_t)ifr); 977 } 978 } else { 979 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 980 } 981 break; 982 default: 983 /* 984 * drop the lock as ether_ioctl() will call bridge_start() and 985 * cause the lock to be recursed. 986 */ 987 BRIDGE_UNLOCK(sc); 988 error = ether_ioctl(ifp, cmd, data); 989 BRIDGE_LOCK(sc); 990 break; 991 } 992 993 BRIDGE_UNLOCK(sc); 994 995 return (error); 996 } 997 998 /* 999 * bridge_mutecaps: 1000 * 1001 * Clear or restore unwanted capabilities on the member interface 1002 */ 1003 static void 1004 bridge_mutecaps(struct bridge_softc *sc) 1005 { 1006 struct bridge_iflist *bif; 1007 int enabled, mask; 1008 1009 BRIDGE_LOCK_ASSERT(sc); 1010 1011 /* Initial bitmask of capabilities to test */ 1012 mask = BRIDGE_IFCAPS_MASK; 1013 1014 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1015 /* Every member must support it or its disabled */ 1016 mask &= bif->bif_savedcaps; 1017 } 1018 1019 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1020 enabled = bif->bif_ifp->if_capenable; 1021 enabled &= ~BRIDGE_IFCAPS_STRIP; 1022 /* strip off mask bits and enable them again if allowed */ 1023 enabled &= ~BRIDGE_IFCAPS_MASK; 1024 enabled |= mask; 1025 bridge_set_ifcap(sc, bif, enabled); 1026 } 1027 } 1028 1029 static void 1030 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1031 { 1032 struct ifnet *ifp = bif->bif_ifp; 1033 struct ifreq ifr; 1034 int error, mask, stuck; 1035 1036 bzero(&ifr, sizeof(ifr)); 1037 ifr.ifr_reqcap = set; 1038 1039 if (ifp->if_capenable != set) { 1040 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1041 if (error) 1042 if_printf(sc->sc_ifp, 1043 "error setting capabilities on %s: %d\n", 1044 ifp->if_xname, error); 1045 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1046 stuck = ifp->if_capenable & mask & ~set; 1047 if (stuck != 0) 1048 if_printf(sc->sc_ifp, 1049 "can't disable some capabilities on %s: 0x%x\n", 1050 ifp->if_xname, stuck); 1051 } 1052 } 1053 1054 /* 1055 * bridge_lookup_member: 1056 * 1057 * Lookup a bridge member interface. 1058 */ 1059 static struct bridge_iflist * 1060 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1061 { 1062 struct bridge_iflist *bif; 1063 struct ifnet *ifp; 1064 1065 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1066 1067 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1068 ifp = bif->bif_ifp; 1069 if (strcmp(ifp->if_xname, name) == 0) 1070 return (bif); 1071 } 1072 1073 return (NULL); 1074 } 1075 1076 /* 1077 * bridge_lookup_member_if: 1078 * 1079 * Lookup a bridge member interface by ifnet*. 1080 */ 1081 static struct bridge_iflist * 1082 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1083 { 1084 struct bridge_iflist *bif; 1085 1086 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1087 1088 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1089 if (bif->bif_ifp == member_ifp) 1090 return (bif); 1091 } 1092 1093 return (NULL); 1094 } 1095 1096 static void 1097 bridge_delete_member_cb(struct epoch_context *ctx) 1098 { 1099 struct bridge_iflist *bif; 1100 1101 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1102 1103 free(bif, M_DEVBUF); 1104 } 1105 1106 /* 1107 * bridge_delete_member: 1108 * 1109 * Delete the specified member interface. 1110 */ 1111 static void 1112 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1113 int gone) 1114 { 1115 struct ifnet *ifs = bif->bif_ifp; 1116 struct ifnet *fif = NULL; 1117 struct bridge_iflist *bifl; 1118 1119 BRIDGE_LOCK_ASSERT(sc); 1120 1121 if (bif->bif_flags & IFBIF_STP) 1122 bstp_disable(&bif->bif_stp); 1123 1124 ifs->if_bridge = NULL; 1125 CK_LIST_REMOVE(bif, bif_next); 1126 1127 /* 1128 * If removing the interface that gave the bridge its mac address, set 1129 * the mac address of the bridge to the address of the next member, or 1130 * to its default address if no members are left. 1131 */ 1132 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1133 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1134 bcopy(&sc->sc_defaddr, 1135 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1136 sc->sc_ifaddr = NULL; 1137 } else { 1138 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1139 fif = bifl->bif_ifp; 1140 bcopy(IF_LLADDR(fif), 1141 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1142 sc->sc_ifaddr = fif; 1143 } 1144 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1145 } 1146 1147 bridge_linkcheck(sc); 1148 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1149 BRIDGE_RT_LOCK(sc); 1150 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1151 BRIDGE_RT_UNLOCK(sc); 1152 KASSERT(bif->bif_addrcnt == 0, 1153 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1154 1155 ifs->if_bridge_output = NULL; 1156 ifs->if_bridge_input = NULL; 1157 ifs->if_bridge_linkstate = NULL; 1158 if (!gone) { 1159 switch (ifs->if_type) { 1160 case IFT_ETHER: 1161 case IFT_L2VLAN: 1162 /* 1163 * Take the interface out of promiscuous mode, but only 1164 * if it was promiscuous in the first place. It might 1165 * not be if we're in the bridge_ioctl_add() error path. 1166 */ 1167 if (ifs->if_flags & IFF_PROMISC) 1168 (void) ifpromisc(ifs, 0); 1169 break; 1170 1171 case IFT_GIF: 1172 break; 1173 1174 default: 1175 #ifdef DIAGNOSTIC 1176 panic("bridge_delete_member: impossible"); 1177 #endif 1178 break; 1179 } 1180 /* reneable any interface capabilities */ 1181 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1182 } 1183 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1184 1185 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1186 } 1187 1188 /* 1189 * bridge_delete_span: 1190 * 1191 * Delete the specified span interface. 1192 */ 1193 static void 1194 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1195 { 1196 BRIDGE_LOCK_ASSERT(sc); 1197 1198 KASSERT(bif->bif_ifp->if_bridge == NULL, 1199 ("%s: not a span interface", __func__)); 1200 1201 CK_LIST_REMOVE(bif, bif_next); 1202 1203 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1204 } 1205 1206 static int 1207 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1208 { 1209 struct ifbreq *req = arg; 1210 struct bridge_iflist *bif = NULL; 1211 struct ifnet *ifs; 1212 int error = 0; 1213 1214 ifs = ifunit(req->ifbr_ifsname); 1215 if (ifs == NULL) 1216 return (ENOENT); 1217 if (ifs->if_ioctl == NULL) /* must be supported */ 1218 return (EINVAL); 1219 1220 /* If it's in the span list, it can't be a member. */ 1221 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1222 if (ifs == bif->bif_ifp) 1223 return (EBUSY); 1224 1225 if (ifs->if_bridge == sc) 1226 return (EEXIST); 1227 1228 if (ifs->if_bridge != NULL) 1229 return (EBUSY); 1230 1231 switch (ifs->if_type) { 1232 case IFT_ETHER: 1233 case IFT_L2VLAN: 1234 case IFT_GIF: 1235 /* permitted interface types */ 1236 break; 1237 default: 1238 return (EINVAL); 1239 } 1240 1241 #ifdef INET6 1242 /* 1243 * Two valid inet6 addresses with link-local scope must not be 1244 * on the parent interface and the member interfaces at the 1245 * same time. This restriction is needed to prevent violation 1246 * of link-local scope zone. Attempts to add a member 1247 * interface which has inet6 addresses when the parent has 1248 * inet6 triggers removal of all inet6 addresses on the member 1249 * interface. 1250 */ 1251 1252 /* Check if the parent interface has a link-local scope addr. */ 1253 if (V_allow_llz_overlap == 0 && 1254 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1255 /* 1256 * If any, remove all inet6 addresses from the member 1257 * interfaces. 1258 */ 1259 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1260 if (in6ifa_llaonifp(bif->bif_ifp)) { 1261 in6_ifdetach(bif->bif_ifp); 1262 if_printf(sc->sc_ifp, 1263 "IPv6 addresses on %s have been removed " 1264 "before adding it as a member to prevent " 1265 "IPv6 address scope violation.\n", 1266 bif->bif_ifp->if_xname); 1267 } 1268 } 1269 if (in6ifa_llaonifp(ifs)) { 1270 in6_ifdetach(ifs); 1271 if_printf(sc->sc_ifp, 1272 "IPv6 addresses on %s have been removed " 1273 "before adding it as a member to prevent " 1274 "IPv6 address scope violation.\n", 1275 ifs->if_xname); 1276 } 1277 } 1278 #endif 1279 /* Allow the first Ethernet member to define the MTU */ 1280 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1281 sc->sc_ifp->if_mtu = ifs->if_mtu; 1282 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1283 struct ifreq ifr; 1284 1285 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1286 ifs->if_xname); 1287 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1288 1289 error = (*ifs->if_ioctl)(ifs, 1290 SIOCSIFMTU, (caddr_t)&ifr); 1291 if (error != 0) { 1292 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1293 " new member %s\n", sc->sc_ifp->if_xname, 1294 ifr.ifr_mtu, 1295 ifs->if_xname); 1296 return (EINVAL); 1297 } 1298 } 1299 1300 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1301 if (bif == NULL) 1302 return (ENOMEM); 1303 1304 bif->bif_ifp = ifs; 1305 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1306 bif->bif_savedcaps = ifs->if_capenable; 1307 1308 /* 1309 * Assign the interface's MAC address to the bridge if it's the first 1310 * member and the MAC address of the bridge has not been changed from 1311 * the default randomly generated one. 1312 */ 1313 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1314 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1315 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1316 sc->sc_ifaddr = ifs; 1317 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1318 } 1319 1320 ifs->if_bridge = sc; 1321 ifs->if_bridge_output = bridge_output; 1322 ifs->if_bridge_input = bridge_input; 1323 ifs->if_bridge_linkstate = bridge_linkstate; 1324 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1325 /* 1326 * XXX: XLOCK HERE!?! 1327 * 1328 * NOTE: insert_***HEAD*** should be safe for the traversals. 1329 */ 1330 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1331 1332 /* Set interface capabilities to the intersection set of all members */ 1333 bridge_mutecaps(sc); 1334 bridge_linkcheck(sc); 1335 1336 /* Place the interface into promiscuous mode */ 1337 switch (ifs->if_type) { 1338 case IFT_ETHER: 1339 case IFT_L2VLAN: 1340 error = ifpromisc(ifs, 1); 1341 break; 1342 } 1343 1344 if (error) 1345 bridge_delete_member(sc, bif, 0); 1346 return (error); 1347 } 1348 1349 static int 1350 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1351 { 1352 struct ifbreq *req = arg; 1353 struct bridge_iflist *bif; 1354 1355 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1356 if (bif == NULL) 1357 return (ENOENT); 1358 1359 bridge_delete_member(sc, bif, 0); 1360 1361 return (0); 1362 } 1363 1364 static int 1365 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1366 { 1367 struct ifbreq *req = arg; 1368 struct bridge_iflist *bif; 1369 struct bstp_port *bp; 1370 1371 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1372 if (bif == NULL) 1373 return (ENOENT); 1374 1375 bp = &bif->bif_stp; 1376 req->ifbr_ifsflags = bif->bif_flags; 1377 req->ifbr_state = bp->bp_state; 1378 req->ifbr_priority = bp->bp_priority; 1379 req->ifbr_path_cost = bp->bp_path_cost; 1380 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1381 req->ifbr_proto = bp->bp_protover; 1382 req->ifbr_role = bp->bp_role; 1383 req->ifbr_stpflags = bp->bp_flags; 1384 req->ifbr_addrcnt = bif->bif_addrcnt; 1385 req->ifbr_addrmax = bif->bif_addrmax; 1386 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1387 1388 /* Copy STP state options as flags */ 1389 if (bp->bp_operedge) 1390 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1391 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1392 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1393 if (bp->bp_ptp_link) 1394 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1395 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1396 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1397 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1398 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1399 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1400 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1401 return (0); 1402 } 1403 1404 static int 1405 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1406 { 1407 struct epoch_tracker et; 1408 struct ifbreq *req = arg; 1409 struct bridge_iflist *bif; 1410 struct bstp_port *bp; 1411 int error; 1412 1413 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1414 if (bif == NULL) 1415 return (ENOENT); 1416 bp = &bif->bif_stp; 1417 1418 if (req->ifbr_ifsflags & IFBIF_SPAN) 1419 /* SPAN is readonly */ 1420 return (EINVAL); 1421 1422 NET_EPOCH_ENTER(et); 1423 1424 if (req->ifbr_ifsflags & IFBIF_STP) { 1425 if ((bif->bif_flags & IFBIF_STP) == 0) { 1426 error = bstp_enable(&bif->bif_stp); 1427 if (error) { 1428 NET_EPOCH_EXIT(et); 1429 return (error); 1430 } 1431 } 1432 } else { 1433 if ((bif->bif_flags & IFBIF_STP) != 0) 1434 bstp_disable(&bif->bif_stp); 1435 } 1436 1437 /* Pass on STP flags */ 1438 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1439 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1440 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1441 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1442 1443 /* Save the bits relating to the bridge */ 1444 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1445 1446 NET_EPOCH_EXIT(et); 1447 1448 return (0); 1449 } 1450 1451 static int 1452 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1453 { 1454 struct ifbrparam *param = arg; 1455 1456 sc->sc_brtmax = param->ifbrp_csize; 1457 bridge_rttrim(sc); 1458 1459 return (0); 1460 } 1461 1462 static int 1463 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1464 { 1465 struct ifbrparam *param = arg; 1466 1467 param->ifbrp_csize = sc->sc_brtmax; 1468 1469 return (0); 1470 } 1471 1472 static int 1473 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1474 { 1475 struct ifbifconf *bifc = arg; 1476 struct bridge_iflist *bif; 1477 struct ifbreq breq; 1478 char *buf, *outbuf; 1479 int count, buflen, len, error = 0; 1480 1481 count = 0; 1482 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1483 count++; 1484 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1485 count++; 1486 1487 buflen = sizeof(breq) * count; 1488 if (bifc->ifbic_len == 0) { 1489 bifc->ifbic_len = buflen; 1490 return (0); 1491 } 1492 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1493 if (outbuf == NULL) 1494 return (ENOMEM); 1495 1496 count = 0; 1497 buf = outbuf; 1498 len = min(bifc->ifbic_len, buflen); 1499 bzero(&breq, sizeof(breq)); 1500 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1501 if (len < sizeof(breq)) 1502 break; 1503 1504 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1505 sizeof(breq.ifbr_ifsname)); 1506 /* Fill in the ifbreq structure */ 1507 error = bridge_ioctl_gifflags(sc, &breq); 1508 if (error) 1509 break; 1510 memcpy(buf, &breq, sizeof(breq)); 1511 count++; 1512 buf += sizeof(breq); 1513 len -= sizeof(breq); 1514 } 1515 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1516 if (len < sizeof(breq)) 1517 break; 1518 1519 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1520 sizeof(breq.ifbr_ifsname)); 1521 breq.ifbr_ifsflags = bif->bif_flags; 1522 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1523 memcpy(buf, &breq, sizeof(breq)); 1524 count++; 1525 buf += sizeof(breq); 1526 len -= sizeof(breq); 1527 } 1528 1529 bifc->ifbic_len = sizeof(breq) * count; 1530 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1531 free(outbuf, M_TEMP); 1532 return (error); 1533 } 1534 1535 static int 1536 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1537 { 1538 struct ifbaconf *bac = arg; 1539 struct bridge_rtnode *brt; 1540 struct ifbareq bareq; 1541 char *buf, *outbuf; 1542 int count, buflen, len, error = 0; 1543 1544 if (bac->ifbac_len == 0) 1545 return (0); 1546 1547 count = 0; 1548 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1549 count++; 1550 buflen = sizeof(bareq) * count; 1551 1552 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1553 if (outbuf == NULL) 1554 return (ENOMEM); 1555 1556 count = 0; 1557 buf = outbuf; 1558 len = min(bac->ifbac_len, buflen); 1559 bzero(&bareq, sizeof(bareq)); 1560 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1561 if (len < sizeof(bareq)) 1562 goto out; 1563 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1564 sizeof(bareq.ifba_ifsname)); 1565 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1566 bareq.ifba_vlan = brt->brt_vlan; 1567 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1568 time_uptime < brt->brt_expire) 1569 bareq.ifba_expire = brt->brt_expire - time_uptime; 1570 else 1571 bareq.ifba_expire = 0; 1572 bareq.ifba_flags = brt->brt_flags; 1573 1574 memcpy(buf, &bareq, sizeof(bareq)); 1575 count++; 1576 buf += sizeof(bareq); 1577 len -= sizeof(bareq); 1578 } 1579 out: 1580 bac->ifbac_len = sizeof(bareq) * count; 1581 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1582 free(outbuf, M_TEMP); 1583 return (error); 1584 } 1585 1586 static int 1587 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1588 { 1589 struct ifbareq *req = arg; 1590 struct bridge_iflist *bif; 1591 struct epoch_tracker et; 1592 int error; 1593 1594 NET_EPOCH_ENTER(et); 1595 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1596 if (bif == NULL) { 1597 NET_EPOCH_EXIT(et); 1598 return (ENOENT); 1599 } 1600 1601 /* bridge_rtupdate() may acquire the lock. */ 1602 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1603 req->ifba_flags); 1604 NET_EPOCH_EXIT(et); 1605 1606 return (error); 1607 } 1608 1609 static int 1610 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1611 { 1612 struct ifbrparam *param = arg; 1613 1614 sc->sc_brttimeout = param->ifbrp_ctime; 1615 return (0); 1616 } 1617 1618 static int 1619 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1620 { 1621 struct ifbrparam *param = arg; 1622 1623 param->ifbrp_ctime = sc->sc_brttimeout; 1624 return (0); 1625 } 1626 1627 static int 1628 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1629 { 1630 struct ifbareq *req = arg; 1631 1632 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1633 } 1634 1635 static int 1636 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1637 { 1638 struct ifbreq *req = arg; 1639 1640 BRIDGE_RT_LOCK(sc); 1641 bridge_rtflush(sc, req->ifbr_ifsflags); 1642 BRIDGE_RT_UNLOCK(sc); 1643 1644 return (0); 1645 } 1646 1647 static int 1648 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1649 { 1650 struct ifbrparam *param = arg; 1651 struct bstp_state *bs = &sc->sc_stp; 1652 1653 param->ifbrp_prio = bs->bs_bridge_priority; 1654 return (0); 1655 } 1656 1657 static int 1658 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1659 { 1660 struct ifbrparam *param = arg; 1661 1662 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1663 } 1664 1665 static int 1666 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1667 { 1668 struct ifbrparam *param = arg; 1669 struct bstp_state *bs = &sc->sc_stp; 1670 1671 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1672 return (0); 1673 } 1674 1675 static int 1676 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1677 { 1678 struct ifbrparam *param = arg; 1679 1680 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1681 } 1682 1683 static int 1684 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1685 { 1686 struct ifbrparam *param = arg; 1687 struct bstp_state *bs = &sc->sc_stp; 1688 1689 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1690 return (0); 1691 } 1692 1693 static int 1694 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1695 { 1696 struct ifbrparam *param = arg; 1697 1698 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1699 } 1700 1701 static int 1702 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1703 { 1704 struct ifbrparam *param = arg; 1705 struct bstp_state *bs = &sc->sc_stp; 1706 1707 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1708 return (0); 1709 } 1710 1711 static int 1712 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1713 { 1714 struct ifbrparam *param = arg; 1715 1716 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1717 } 1718 1719 static int 1720 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1721 { 1722 struct ifbreq *req = arg; 1723 struct bridge_iflist *bif; 1724 1725 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1726 if (bif == NULL) 1727 return (ENOENT); 1728 1729 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1730 } 1731 1732 static int 1733 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1734 { 1735 struct ifbreq *req = arg; 1736 struct bridge_iflist *bif; 1737 1738 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1739 if (bif == NULL) 1740 return (ENOENT); 1741 1742 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1743 } 1744 1745 static int 1746 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1747 { 1748 struct ifbreq *req = arg; 1749 struct bridge_iflist *bif; 1750 1751 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1752 if (bif == NULL) 1753 return (ENOENT); 1754 1755 bif->bif_addrmax = req->ifbr_addrmax; 1756 return (0); 1757 } 1758 1759 static int 1760 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1761 { 1762 struct ifbreq *req = arg; 1763 struct bridge_iflist *bif = NULL; 1764 struct ifnet *ifs; 1765 1766 ifs = ifunit(req->ifbr_ifsname); 1767 if (ifs == NULL) 1768 return (ENOENT); 1769 1770 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1771 if (ifs == bif->bif_ifp) 1772 return (EBUSY); 1773 1774 if (ifs->if_bridge != NULL) 1775 return (EBUSY); 1776 1777 switch (ifs->if_type) { 1778 case IFT_ETHER: 1779 case IFT_GIF: 1780 case IFT_L2VLAN: 1781 break; 1782 default: 1783 return (EINVAL); 1784 } 1785 1786 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1787 if (bif == NULL) 1788 return (ENOMEM); 1789 1790 bif->bif_ifp = ifs; 1791 bif->bif_flags = IFBIF_SPAN; 1792 1793 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1794 1795 return (0); 1796 } 1797 1798 static int 1799 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1800 { 1801 struct ifbreq *req = arg; 1802 struct bridge_iflist *bif; 1803 struct ifnet *ifs; 1804 1805 ifs = ifunit(req->ifbr_ifsname); 1806 if (ifs == NULL) 1807 return (ENOENT); 1808 1809 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1810 if (ifs == bif->bif_ifp) 1811 break; 1812 1813 if (bif == NULL) 1814 return (ENOENT); 1815 1816 bridge_delete_span(sc, bif); 1817 1818 return (0); 1819 } 1820 1821 static int 1822 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1823 { 1824 struct ifbropreq *req = arg; 1825 struct bstp_state *bs = &sc->sc_stp; 1826 struct bstp_port *root_port; 1827 1828 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1829 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1830 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1831 1832 root_port = bs->bs_root_port; 1833 if (root_port == NULL) 1834 req->ifbop_root_port = 0; 1835 else 1836 req->ifbop_root_port = root_port->bp_ifp->if_index; 1837 1838 req->ifbop_holdcount = bs->bs_txholdcount; 1839 req->ifbop_priority = bs->bs_bridge_priority; 1840 req->ifbop_protocol = bs->bs_protover; 1841 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1842 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1843 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1844 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1845 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1846 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1847 1848 return (0); 1849 } 1850 1851 static int 1852 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1853 { 1854 struct ifbrparam *param = arg; 1855 1856 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1857 return (0); 1858 } 1859 1860 static int 1861 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1862 { 1863 struct ifbpstpconf *bifstp = arg; 1864 struct bridge_iflist *bif; 1865 struct bstp_port *bp; 1866 struct ifbpstpreq bpreq; 1867 char *buf, *outbuf; 1868 int count, buflen, len, error = 0; 1869 1870 count = 0; 1871 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1872 if ((bif->bif_flags & IFBIF_STP) != 0) 1873 count++; 1874 } 1875 1876 buflen = sizeof(bpreq) * count; 1877 if (bifstp->ifbpstp_len == 0) { 1878 bifstp->ifbpstp_len = buflen; 1879 return (0); 1880 } 1881 1882 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1883 if (outbuf == NULL) 1884 return (ENOMEM); 1885 1886 count = 0; 1887 buf = outbuf; 1888 len = min(bifstp->ifbpstp_len, buflen); 1889 bzero(&bpreq, sizeof(bpreq)); 1890 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1891 if (len < sizeof(bpreq)) 1892 break; 1893 1894 if ((bif->bif_flags & IFBIF_STP) == 0) 1895 continue; 1896 1897 bp = &bif->bif_stp; 1898 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1899 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1900 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1901 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1902 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1903 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1904 1905 memcpy(buf, &bpreq, sizeof(bpreq)); 1906 count++; 1907 buf += sizeof(bpreq); 1908 len -= sizeof(bpreq); 1909 } 1910 1911 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1912 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1913 free(outbuf, M_TEMP); 1914 return (error); 1915 } 1916 1917 static int 1918 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1919 { 1920 struct ifbrparam *param = arg; 1921 1922 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1923 } 1924 1925 static int 1926 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1927 { 1928 struct ifbrparam *param = arg; 1929 1930 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1931 } 1932 1933 /* 1934 * bridge_ifdetach: 1935 * 1936 * Detach an interface from a bridge. Called when a member 1937 * interface is detaching. 1938 */ 1939 static void 1940 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1941 { 1942 struct bridge_softc *sc = ifp->if_bridge; 1943 struct bridge_iflist *bif; 1944 1945 if (ifp->if_flags & IFF_RENAMING) 1946 return; 1947 if (V_bridge_cloner == NULL) { 1948 /* 1949 * This detach handler can be called after 1950 * vnet_bridge_uninit(). Just return in that case. 1951 */ 1952 return; 1953 } 1954 /* Check if the interface is a bridge member */ 1955 if (sc != NULL) { 1956 BRIDGE_LOCK(sc); 1957 1958 bif = bridge_lookup_member_if(sc, ifp); 1959 if (bif != NULL) 1960 bridge_delete_member(sc, bif, 1); 1961 1962 BRIDGE_UNLOCK(sc); 1963 return; 1964 } 1965 1966 /* Check if the interface is a span port */ 1967 BRIDGE_LIST_LOCK(); 1968 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1969 BRIDGE_LOCK(sc); 1970 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1971 if (ifp == bif->bif_ifp) { 1972 bridge_delete_span(sc, bif); 1973 break; 1974 } 1975 1976 BRIDGE_UNLOCK(sc); 1977 } 1978 BRIDGE_LIST_UNLOCK(); 1979 } 1980 1981 /* 1982 * bridge_init: 1983 * 1984 * Initialize a bridge interface. 1985 */ 1986 static void 1987 bridge_init(void *xsc) 1988 { 1989 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1990 struct ifnet *ifp = sc->sc_ifp; 1991 1992 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1993 return; 1994 1995 BRIDGE_LOCK(sc); 1996 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1997 bridge_timer, sc); 1998 1999 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2000 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2001 2002 BRIDGE_UNLOCK(sc); 2003 } 2004 2005 /* 2006 * bridge_stop: 2007 * 2008 * Stop the bridge interface. 2009 */ 2010 static void 2011 bridge_stop(struct ifnet *ifp, int disable) 2012 { 2013 struct bridge_softc *sc = ifp->if_softc; 2014 2015 BRIDGE_LOCK_ASSERT(sc); 2016 2017 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2018 return; 2019 2020 BRIDGE_RT_LOCK(sc); 2021 callout_stop(&sc->sc_brcallout); 2022 2023 bstp_stop(&sc->sc_stp); 2024 2025 bridge_rtflush(sc, IFBF_FLUSHDYN); 2026 BRIDGE_RT_UNLOCK(sc); 2027 2028 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2029 } 2030 2031 /* 2032 * bridge_enqueue: 2033 * 2034 * Enqueue a packet on a bridge member interface. 2035 * 2036 */ 2037 static int 2038 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2039 { 2040 int len, err = 0; 2041 short mflags; 2042 struct mbuf *m0; 2043 2044 /* We may be sending a fragment so traverse the mbuf */ 2045 for (; m; m = m0) { 2046 m0 = m->m_nextpkt; 2047 m->m_nextpkt = NULL; 2048 len = m->m_pkthdr.len; 2049 mflags = m->m_flags; 2050 2051 /* 2052 * If underlying interface can not do VLAN tag insertion itself 2053 * then attach a packet tag that holds it. 2054 */ 2055 if ((m->m_flags & M_VLANTAG) && 2056 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2057 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2058 if (m == NULL) { 2059 if_printf(dst_ifp, 2060 "unable to prepend VLAN header\n"); 2061 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2062 continue; 2063 } 2064 m->m_flags &= ~M_VLANTAG; 2065 } 2066 2067 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2068 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2069 int n; 2070 2071 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2072 m0 = m->m_nextpkt; 2073 m_freem(m); 2074 } 2075 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2076 break; 2077 } 2078 2079 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2080 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2081 if (mflags & M_MCAST) 2082 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2083 } 2084 2085 return (err); 2086 } 2087 2088 /* 2089 * bridge_dummynet: 2090 * 2091 * Receive a queued packet from dummynet and pass it on to the output 2092 * interface. 2093 * 2094 * The mbuf has the Ethernet header already attached. 2095 */ 2096 static void 2097 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2098 { 2099 struct bridge_softc *sc; 2100 2101 sc = ifp->if_bridge; 2102 2103 /* 2104 * The packet didnt originate from a member interface. This should only 2105 * ever happen if a member interface is removed while packets are 2106 * queued for it. 2107 */ 2108 if (sc == NULL) { 2109 m_freem(m); 2110 return; 2111 } 2112 2113 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2114 #ifdef INET6 2115 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2116 #endif 2117 ) { 2118 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2119 return; 2120 if (m == NULL) 2121 return; 2122 } 2123 2124 bridge_enqueue(sc, ifp, m); 2125 } 2126 2127 /* 2128 * bridge_output: 2129 * 2130 * Send output from a bridge member interface. This 2131 * performs the bridging function for locally originated 2132 * packets. 2133 * 2134 * The mbuf has the Ethernet header already attached. We must 2135 * enqueue or free the mbuf before returning. 2136 */ 2137 static int 2138 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2139 struct rtentry *rt) 2140 { 2141 struct ether_header *eh; 2142 struct ifnet *bifp, *dst_if; 2143 struct bridge_softc *sc; 2144 uint16_t vlan; 2145 2146 NET_EPOCH_ASSERT(); 2147 2148 if (m->m_len < ETHER_HDR_LEN) { 2149 m = m_pullup(m, ETHER_HDR_LEN); 2150 if (m == NULL) 2151 return (0); 2152 } 2153 2154 eh = mtod(m, struct ether_header *); 2155 sc = ifp->if_bridge; 2156 vlan = VLANTAGOF(m); 2157 2158 bifp = sc->sc_ifp; 2159 2160 /* 2161 * If bridge is down, but the original output interface is up, 2162 * go ahead and send out that interface. Otherwise, the packet 2163 * is dropped below. 2164 */ 2165 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2166 dst_if = ifp; 2167 goto sendunicast; 2168 } 2169 2170 /* 2171 * If the packet is a multicast, or we don't know a better way to 2172 * get there, send to all interfaces. 2173 */ 2174 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2175 dst_if = NULL; 2176 else 2177 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2178 /* Tap any traffic not passing back out the originating interface */ 2179 if (dst_if != ifp) 2180 ETHER_BPF_MTAP(bifp, m); 2181 if (dst_if == NULL) { 2182 struct bridge_iflist *bif; 2183 struct mbuf *mc; 2184 int used = 0; 2185 2186 bridge_span(sc, m); 2187 2188 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2189 dst_if = bif->bif_ifp; 2190 2191 if (dst_if->if_type == IFT_GIF) 2192 continue; 2193 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2194 continue; 2195 2196 /* 2197 * If this is not the original output interface, 2198 * and the interface is participating in spanning 2199 * tree, make sure the port is in a state that 2200 * allows forwarding. 2201 */ 2202 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2203 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2204 continue; 2205 2206 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2207 used = 1; 2208 mc = m; 2209 } else { 2210 mc = m_dup(m, M_NOWAIT); 2211 if (mc == NULL) { 2212 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2213 continue; 2214 } 2215 } 2216 2217 bridge_enqueue(sc, dst_if, mc); 2218 } 2219 if (used == 0) 2220 m_freem(m); 2221 return (0); 2222 } 2223 2224 sendunicast: 2225 /* 2226 * XXX Spanning tree consideration here? 2227 */ 2228 2229 bridge_span(sc, m); 2230 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2231 m_freem(m); 2232 return (0); 2233 } 2234 2235 bridge_enqueue(sc, dst_if, m); 2236 return (0); 2237 } 2238 2239 /* 2240 * bridge_transmit: 2241 * 2242 * Do output on a bridge. 2243 * 2244 */ 2245 static int 2246 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2247 { 2248 struct bridge_softc *sc; 2249 struct ether_header *eh; 2250 struct ifnet *dst_if; 2251 int error = 0; 2252 2253 sc = ifp->if_softc; 2254 2255 ETHER_BPF_MTAP(ifp, m); 2256 2257 eh = mtod(m, struct ether_header *); 2258 2259 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2260 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2261 error = bridge_enqueue(sc, dst_if, m); 2262 } else 2263 bridge_broadcast(sc, ifp, m, 0); 2264 2265 return (error); 2266 } 2267 2268 #ifdef ALTQ 2269 static void 2270 bridge_altq_start(if_t ifp) 2271 { 2272 struct ifaltq *ifq = &ifp->if_snd; 2273 struct mbuf *m; 2274 2275 IFQ_LOCK(ifq); 2276 IFQ_DEQUEUE_NOLOCK(ifq, m); 2277 while (m != NULL) { 2278 bridge_transmit(ifp, m); 2279 IFQ_DEQUEUE_NOLOCK(ifq, m); 2280 } 2281 IFQ_UNLOCK(ifq); 2282 } 2283 2284 static int 2285 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2286 { 2287 int err; 2288 2289 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2290 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2291 if (err == 0) 2292 bridge_altq_start(ifp); 2293 } else 2294 err = bridge_transmit(ifp, m); 2295 2296 return (err); 2297 } 2298 #endif /* ALTQ */ 2299 2300 /* 2301 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2302 */ 2303 static void 2304 bridge_qflush(struct ifnet *ifp __unused) 2305 { 2306 } 2307 2308 /* 2309 * bridge_forward: 2310 * 2311 * The forwarding function of the bridge. 2312 * 2313 * NOTE: Releases the lock on return. 2314 */ 2315 static void 2316 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2317 struct mbuf *m) 2318 { 2319 struct bridge_iflist *dbif; 2320 struct ifnet *src_if, *dst_if, *ifp; 2321 struct ether_header *eh; 2322 uint16_t vlan; 2323 uint8_t *dst; 2324 int error; 2325 2326 NET_EPOCH_ASSERT(); 2327 2328 src_if = m->m_pkthdr.rcvif; 2329 ifp = sc->sc_ifp; 2330 2331 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2332 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2333 vlan = VLANTAGOF(m); 2334 2335 if ((sbif->bif_flags & IFBIF_STP) && 2336 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2337 goto drop; 2338 2339 eh = mtod(m, struct ether_header *); 2340 dst = eh->ether_dhost; 2341 2342 /* If the interface is learning, record the address. */ 2343 if (sbif->bif_flags & IFBIF_LEARNING) { 2344 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2345 sbif, 0, IFBAF_DYNAMIC); 2346 /* 2347 * If the interface has addresses limits then deny any source 2348 * that is not in the cache. 2349 */ 2350 if (error && sbif->bif_addrmax) 2351 goto drop; 2352 } 2353 2354 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2355 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2356 goto drop; 2357 2358 /* 2359 * At this point, the port either doesn't participate 2360 * in spanning tree or it is in the forwarding state. 2361 */ 2362 2363 /* 2364 * If the packet is unicast, destined for someone on 2365 * "this" side of the bridge, drop it. 2366 */ 2367 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2368 dst_if = bridge_rtlookup(sc, dst, vlan); 2369 if (src_if == dst_if) 2370 goto drop; 2371 } else { 2372 /* 2373 * Check if its a reserved multicast address, any address 2374 * listed in 802.1D section 7.12.6 may not be forwarded by the 2375 * bridge. 2376 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2377 */ 2378 if (dst[0] == 0x01 && dst[1] == 0x80 && 2379 dst[2] == 0xc2 && dst[3] == 0x00 && 2380 dst[4] == 0x00 && dst[5] <= 0x0f) 2381 goto drop; 2382 2383 /* ...forward it to all interfaces. */ 2384 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2385 dst_if = NULL; 2386 } 2387 2388 /* 2389 * If we have a destination interface which is a member of our bridge, 2390 * OR this is a unicast packet, push it through the bpf(4) machinery. 2391 * For broadcast or multicast packets, don't bother because it will 2392 * be reinjected into ether_input. We do this before we pass the packets 2393 * through the pfil(9) framework, as it is possible that pfil(9) will 2394 * drop the packet, or possibly modify it, making it difficult to debug 2395 * firewall issues on the bridge. 2396 */ 2397 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2398 ETHER_BPF_MTAP(ifp, m); 2399 2400 /* run the packet filter */ 2401 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2402 #ifdef INET6 2403 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2404 #endif 2405 ) { 2406 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2407 return; 2408 if (m == NULL) 2409 return; 2410 } 2411 2412 if (dst_if == NULL) { 2413 bridge_broadcast(sc, src_if, m, 1); 2414 return; 2415 } 2416 2417 /* 2418 * At this point, we're dealing with a unicast frame 2419 * going to a different interface. 2420 */ 2421 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2422 goto drop; 2423 2424 dbif = bridge_lookup_member_if(sc, dst_if); 2425 if (dbif == NULL) 2426 /* Not a member of the bridge (anymore?) */ 2427 goto drop; 2428 2429 /* Private segments can not talk to each other */ 2430 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2431 goto drop; 2432 2433 if ((dbif->bif_flags & IFBIF_STP) && 2434 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2435 goto drop; 2436 2437 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2438 #ifdef INET6 2439 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2440 #endif 2441 ) { 2442 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2443 return; 2444 if (m == NULL) 2445 return; 2446 } 2447 2448 bridge_enqueue(sc, dst_if, m); 2449 return; 2450 2451 drop: 2452 m_freem(m); 2453 } 2454 2455 /* 2456 * bridge_input: 2457 * 2458 * Receive input from a member interface. Queue the packet for 2459 * bridging if it is not for us. 2460 */ 2461 static struct mbuf * 2462 bridge_input(struct ifnet *ifp, struct mbuf *m) 2463 { 2464 struct bridge_softc *sc = ifp->if_bridge; 2465 struct bridge_iflist *bif, *bif2; 2466 struct ifnet *bifp; 2467 struct ether_header *eh; 2468 struct mbuf *mc, *mc2; 2469 uint16_t vlan; 2470 int error; 2471 2472 NET_EPOCH_ASSERT(); 2473 2474 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2475 return (m); 2476 2477 bifp = sc->sc_ifp; 2478 vlan = VLANTAGOF(m); 2479 2480 /* 2481 * Implement support for bridge monitoring. If this flag has been 2482 * set on this interface, discard the packet once we push it through 2483 * the bpf(4) machinery, but before we do, increment the byte and 2484 * packet counters associated with this interface. 2485 */ 2486 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2487 m->m_pkthdr.rcvif = bifp; 2488 ETHER_BPF_MTAP(bifp, m); 2489 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2490 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2491 m_freem(m); 2492 return (NULL); 2493 } 2494 bif = bridge_lookup_member_if(sc, ifp); 2495 if (bif == NULL) { 2496 return (m); 2497 } 2498 2499 eh = mtod(m, struct ether_header *); 2500 2501 bridge_span(sc, m); 2502 2503 if (m->m_flags & (M_BCAST|M_MCAST)) { 2504 /* Tap off 802.1D packets; they do not get forwarded. */ 2505 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2506 ETHER_ADDR_LEN) == 0) { 2507 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2508 return (NULL); 2509 } 2510 2511 if ((bif->bif_flags & IFBIF_STP) && 2512 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2513 return (m); 2514 } 2515 2516 /* 2517 * Make a deep copy of the packet and enqueue the copy 2518 * for bridge processing; return the original packet for 2519 * local processing. 2520 */ 2521 mc = m_dup(m, M_NOWAIT); 2522 if (mc == NULL) { 2523 return (m); 2524 } 2525 2526 /* Perform the bridge forwarding function with the copy. */ 2527 bridge_forward(sc, bif, mc); 2528 2529 /* 2530 * Reinject the mbuf as arriving on the bridge so we have a 2531 * chance at claiming multicast packets. We can not loop back 2532 * here from ether_input as a bridge is never a member of a 2533 * bridge. 2534 */ 2535 KASSERT(bifp->if_bridge == NULL, 2536 ("loop created in bridge_input")); 2537 mc2 = m_dup(m, M_NOWAIT); 2538 if (mc2 != NULL) { 2539 /* Keep the layer3 header aligned */ 2540 int i = min(mc2->m_pkthdr.len, max_protohdr); 2541 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2542 } 2543 if (mc2 != NULL) { 2544 mc2->m_pkthdr.rcvif = bifp; 2545 (*bifp->if_input)(bifp, mc2); 2546 } 2547 2548 /* Return the original packet for local processing. */ 2549 return (m); 2550 } 2551 2552 if ((bif->bif_flags & IFBIF_STP) && 2553 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2554 return (m); 2555 } 2556 2557 #if defined(INET) || defined(INET6) 2558 #define CARP_CHECK_WE_ARE_DST(iface) \ 2559 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 2560 #define CARP_CHECK_WE_ARE_SRC(iface) \ 2561 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 2562 #else 2563 #define CARP_CHECK_WE_ARE_DST(iface) false 2564 #define CARP_CHECK_WE_ARE_SRC(iface) false 2565 #endif 2566 2567 #ifdef INET6 2568 #define PFIL_HOOKED_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 2569 #else 2570 #define PFIL_HOOKED_INET6 false 2571 #endif 2572 2573 #define GRAB_OUR_PACKETS(iface) \ 2574 if ((iface)->if_type == IFT_GIF) \ 2575 continue; \ 2576 /* It is destined for us. */ \ 2577 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 2578 CARP_CHECK_WE_ARE_DST(iface)) { \ 2579 if (bif->bif_flags & IFBIF_LEARNING) { \ 2580 error = bridge_rtupdate(sc, eh->ether_shost, \ 2581 vlan, bif, 0, IFBAF_DYNAMIC); \ 2582 if (error && bif->bif_addrmax) { \ 2583 m_freem(m); \ 2584 return (NULL); \ 2585 } \ 2586 } \ 2587 m->m_pkthdr.rcvif = iface; \ 2588 if ((iface) == ifp) { \ 2589 /* Skip bridge processing... src == dest */ \ 2590 return (m); \ 2591 } \ 2592 /* It's passing over or to the bridge, locally. */ \ 2593 ETHER_BPF_MTAP(bifp, m); \ 2594 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2595 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2596 /* Filter on the physical interface. */ \ 2597 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) || \ 2598 PFIL_HOOKED_INET6)) { \ 2599 if (bridge_pfil(&m, NULL, ifp, \ 2600 PFIL_IN) != 0 || m == NULL) { \ 2601 return (NULL); \ 2602 } \ 2603 } \ 2604 if ((iface) != bifp) \ 2605 ETHER_BPF_MTAP(iface, m); \ 2606 return (m); \ 2607 } \ 2608 \ 2609 /* We just received a packet that we sent out. */ \ 2610 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 2611 CARP_CHECK_WE_ARE_SRC(iface)) { \ 2612 m_freem(m); \ 2613 return (NULL); \ 2614 } 2615 2616 /* 2617 * Unicast. Make sure it's not for the bridge. 2618 */ 2619 do { GRAB_OUR_PACKETS(bifp) } while (0); 2620 2621 /* 2622 * Give a chance for ifp at first priority. This will help when the 2623 * packet comes through the interface like VLAN's with the same MACs 2624 * on several interfaces from the same bridge. This also will save 2625 * some CPU cycles in case the destination interface and the input 2626 * interface (eq ifp) are the same. 2627 */ 2628 do { GRAB_OUR_PACKETS(ifp) } while (0); 2629 2630 /* Now check the all bridge members. */ 2631 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2632 GRAB_OUR_PACKETS(bif2->bif_ifp) 2633 } 2634 2635 #undef CARP_CHECK_WE_ARE_DST 2636 #undef CARP_CHECK_WE_ARE_SRC 2637 #undef PFIL_HOOKED_INET6 2638 #undef GRAB_OUR_PACKETS 2639 2640 /* Perform the bridge forwarding function. */ 2641 bridge_forward(sc, bif, m); 2642 2643 return (NULL); 2644 } 2645 2646 /* 2647 * bridge_broadcast: 2648 * 2649 * Send a frame to all interfaces that are members of 2650 * the bridge, except for the one on which the packet 2651 * arrived. 2652 * 2653 * NOTE: Releases the lock on return. 2654 */ 2655 static void 2656 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2657 struct mbuf *m, int runfilt) 2658 { 2659 struct bridge_iflist *dbif, *sbif; 2660 struct mbuf *mc; 2661 struct ifnet *dst_if; 2662 int used = 0, i; 2663 2664 NET_EPOCH_ASSERT(); 2665 2666 sbif = bridge_lookup_member_if(sc, src_if); 2667 2668 /* Filter on the bridge interface before broadcasting */ 2669 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2670 #ifdef INET6 2671 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2672 #endif 2673 )) { 2674 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2675 return; 2676 if (m == NULL) 2677 return; 2678 } 2679 2680 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2681 dst_if = dbif->bif_ifp; 2682 if (dst_if == src_if) 2683 continue; 2684 2685 /* Private segments can not talk to each other */ 2686 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2687 continue; 2688 2689 if ((dbif->bif_flags & IFBIF_STP) && 2690 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2691 continue; 2692 2693 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2694 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2695 continue; 2696 2697 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2698 continue; 2699 2700 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2701 mc = m; 2702 used = 1; 2703 } else { 2704 mc = m_dup(m, M_NOWAIT); 2705 if (mc == NULL) { 2706 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2707 continue; 2708 } 2709 } 2710 2711 /* 2712 * Filter on the output interface. Pass a NULL bridge interface 2713 * pointer so we do not redundantly filter on the bridge for 2714 * each interface we broadcast on. 2715 */ 2716 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2717 #ifdef INET6 2718 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2719 #endif 2720 )) { 2721 if (used == 0) { 2722 /* Keep the layer3 header aligned */ 2723 i = min(mc->m_pkthdr.len, max_protohdr); 2724 mc = m_copyup(mc, i, ETHER_ALIGN); 2725 if (mc == NULL) { 2726 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2727 continue; 2728 } 2729 } 2730 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2731 continue; 2732 if (mc == NULL) 2733 continue; 2734 } 2735 2736 bridge_enqueue(sc, dst_if, mc); 2737 } 2738 if (used == 0) 2739 m_freem(m); 2740 } 2741 2742 /* 2743 * bridge_span: 2744 * 2745 * Duplicate a packet out one or more interfaces that are in span mode, 2746 * the original mbuf is unmodified. 2747 */ 2748 static void 2749 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2750 { 2751 struct bridge_iflist *bif; 2752 struct ifnet *dst_if; 2753 struct mbuf *mc; 2754 2755 NET_EPOCH_ASSERT(); 2756 2757 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2758 return; 2759 2760 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2761 dst_if = bif->bif_ifp; 2762 2763 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2764 continue; 2765 2766 mc = m_dup(m, M_NOWAIT); 2767 if (mc == NULL) { 2768 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2769 continue; 2770 } 2771 2772 bridge_enqueue(sc, dst_if, mc); 2773 } 2774 } 2775 2776 /* 2777 * bridge_rtupdate: 2778 * 2779 * Add a bridge routing entry. 2780 */ 2781 static int 2782 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2783 struct bridge_iflist *bif, int setflags, uint8_t flags) 2784 { 2785 struct bridge_rtnode *brt; 2786 struct bridge_iflist *obif; 2787 int error; 2788 2789 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2790 2791 /* Check the source address is valid and not multicast. */ 2792 if (ETHER_IS_MULTICAST(dst) || 2793 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2794 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2795 return (EINVAL); 2796 2797 /* 802.1p frames map to vlan 1 */ 2798 if (vlan == 0) 2799 vlan = 1; 2800 2801 /* 2802 * A route for this destination might already exist. If so, 2803 * update it, otherwise create a new one. 2804 */ 2805 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2806 BRIDGE_RT_LOCK(sc); 2807 2808 /* Check again, now that we have the lock. There could have 2809 * been a race and we only want to insert this once. */ 2810 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 2811 BRIDGE_RT_UNLOCK(sc); 2812 return (0); 2813 } 2814 2815 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2816 sc->sc_brtexceeded++; 2817 BRIDGE_RT_UNLOCK(sc); 2818 return (ENOSPC); 2819 } 2820 /* Check per interface address limits (if enabled) */ 2821 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2822 bif->bif_addrexceeded++; 2823 BRIDGE_RT_UNLOCK(sc); 2824 return (ENOSPC); 2825 } 2826 2827 /* 2828 * Allocate a new bridge forwarding node, and 2829 * initialize the expiration time and Ethernet 2830 * address. 2831 */ 2832 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2833 if (brt == NULL) { 2834 BRIDGE_RT_UNLOCK(sc); 2835 return (ENOMEM); 2836 } 2837 brt->brt_vnet = curvnet; 2838 2839 if (bif->bif_flags & IFBIF_STICKY) 2840 brt->brt_flags = IFBAF_STICKY; 2841 else 2842 brt->brt_flags = IFBAF_DYNAMIC; 2843 2844 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2845 brt->brt_vlan = vlan; 2846 2847 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2848 uma_zfree(V_bridge_rtnode_zone, brt); 2849 BRIDGE_RT_UNLOCK(sc); 2850 return (error); 2851 } 2852 brt->brt_dst = bif; 2853 bif->bif_addrcnt++; 2854 2855 BRIDGE_RT_UNLOCK(sc); 2856 } 2857 2858 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2859 (obif = brt->brt_dst) != bif) { 2860 BRIDGE_RT_LOCK(sc); 2861 brt->brt_dst->bif_addrcnt--; 2862 brt->brt_dst = bif; 2863 brt->brt_dst->bif_addrcnt++; 2864 BRIDGE_RT_UNLOCK(sc); 2865 2866 if (V_log_mac_flap && 2867 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 2868 uint8_t *addr = &brt->brt_addr[0]; 2869 log(LOG_NOTICE, 2870 "%s: mac address %02x:%02x:%02x:%02x:%02x:%02x vlan %d moved from %s to %s\n", 2871 sc->sc_ifp->if_xname, 2872 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], 2873 brt->brt_vlan, 2874 obif->bif_ifp->if_xname, 2875 bif->bif_ifp->if_xname); 2876 } 2877 } 2878 2879 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2880 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2881 if (setflags) 2882 brt->brt_flags = flags; 2883 2884 return (0); 2885 } 2886 2887 /* 2888 * bridge_rtlookup: 2889 * 2890 * Lookup the destination interface for an address. 2891 */ 2892 static struct ifnet * 2893 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2894 { 2895 struct bridge_rtnode *brt; 2896 2897 NET_EPOCH_ASSERT(); 2898 2899 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2900 return (NULL); 2901 2902 return (brt->brt_ifp); 2903 } 2904 2905 /* 2906 * bridge_rttrim: 2907 * 2908 * Trim the routine table so that we have a number 2909 * of routing entries less than or equal to the 2910 * maximum number. 2911 */ 2912 static void 2913 bridge_rttrim(struct bridge_softc *sc) 2914 { 2915 struct bridge_rtnode *brt, *nbrt; 2916 2917 NET_EPOCH_ASSERT(); 2918 BRIDGE_RT_LOCK_ASSERT(sc); 2919 2920 /* Make sure we actually need to do this. */ 2921 if (sc->sc_brtcnt <= sc->sc_brtmax) 2922 return; 2923 2924 /* Force an aging cycle; this might trim enough addresses. */ 2925 bridge_rtage(sc); 2926 if (sc->sc_brtcnt <= sc->sc_brtmax) 2927 return; 2928 2929 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2930 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2931 bridge_rtnode_destroy(sc, brt); 2932 if (sc->sc_brtcnt <= sc->sc_brtmax) 2933 return; 2934 } 2935 } 2936 } 2937 2938 /* 2939 * bridge_timer: 2940 * 2941 * Aging timer for the bridge. 2942 */ 2943 static void 2944 bridge_timer(void *arg) 2945 { 2946 struct bridge_softc *sc = arg; 2947 2948 BRIDGE_RT_LOCK_ASSERT(sc); 2949 2950 /* Destruction of rtnodes requires a proper vnet context */ 2951 CURVNET_SET(sc->sc_ifp->if_vnet); 2952 bridge_rtage(sc); 2953 2954 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2955 callout_reset(&sc->sc_brcallout, 2956 bridge_rtable_prune_period * hz, bridge_timer, sc); 2957 CURVNET_RESTORE(); 2958 } 2959 2960 /* 2961 * bridge_rtage: 2962 * 2963 * Perform an aging cycle. 2964 */ 2965 static void 2966 bridge_rtage(struct bridge_softc *sc) 2967 { 2968 struct bridge_rtnode *brt, *nbrt; 2969 2970 BRIDGE_RT_LOCK_ASSERT(sc); 2971 2972 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2973 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2974 if (time_uptime >= brt->brt_expire) 2975 bridge_rtnode_destroy(sc, brt); 2976 } 2977 } 2978 } 2979 2980 /* 2981 * bridge_rtflush: 2982 * 2983 * Remove all dynamic addresses from the bridge. 2984 */ 2985 static void 2986 bridge_rtflush(struct bridge_softc *sc, int full) 2987 { 2988 struct bridge_rtnode *brt, *nbrt; 2989 2990 BRIDGE_RT_LOCK_ASSERT(sc); 2991 2992 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2993 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2994 bridge_rtnode_destroy(sc, brt); 2995 } 2996 } 2997 2998 /* 2999 * bridge_rtdaddr: 3000 * 3001 * Remove an address from the table. 3002 */ 3003 static int 3004 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3005 { 3006 struct bridge_rtnode *brt; 3007 int found = 0; 3008 3009 BRIDGE_RT_LOCK(sc); 3010 3011 /* 3012 * If vlan is zero then we want to delete for all vlans so the lookup 3013 * may return more than one. 3014 */ 3015 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3016 bridge_rtnode_destroy(sc, brt); 3017 found = 1; 3018 } 3019 3020 BRIDGE_RT_UNLOCK(sc); 3021 3022 return (found ? 0 : ENOENT); 3023 } 3024 3025 /* 3026 * bridge_rtdelete: 3027 * 3028 * Delete routes to a speicifc member interface. 3029 */ 3030 static void 3031 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3032 { 3033 struct bridge_rtnode *brt, *nbrt; 3034 3035 BRIDGE_RT_LOCK_ASSERT(sc); 3036 3037 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3038 if (brt->brt_ifp == ifp && (full || 3039 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3040 bridge_rtnode_destroy(sc, brt); 3041 } 3042 } 3043 3044 /* 3045 * bridge_rtable_init: 3046 * 3047 * Initialize the route table for this bridge. 3048 */ 3049 static void 3050 bridge_rtable_init(struct bridge_softc *sc) 3051 { 3052 int i; 3053 3054 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3055 M_DEVBUF, M_WAITOK); 3056 3057 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3058 CK_LIST_INIT(&sc->sc_rthash[i]); 3059 3060 sc->sc_rthash_key = arc4random(); 3061 CK_LIST_INIT(&sc->sc_rtlist); 3062 } 3063 3064 /* 3065 * bridge_rtable_fini: 3066 * 3067 * Deconstruct the route table for this bridge. 3068 */ 3069 static void 3070 bridge_rtable_fini(struct bridge_softc *sc) 3071 { 3072 3073 KASSERT(sc->sc_brtcnt == 0, 3074 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3075 free(sc->sc_rthash, M_DEVBUF); 3076 } 3077 3078 /* 3079 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3080 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3081 */ 3082 #define mix(a, b, c) \ 3083 do { \ 3084 a -= b; a -= c; a ^= (c >> 13); \ 3085 b -= c; b -= a; b ^= (a << 8); \ 3086 c -= a; c -= b; c ^= (b >> 13); \ 3087 a -= b; a -= c; a ^= (c >> 12); \ 3088 b -= c; b -= a; b ^= (a << 16); \ 3089 c -= a; c -= b; c ^= (b >> 5); \ 3090 a -= b; a -= c; a ^= (c >> 3); \ 3091 b -= c; b -= a; b ^= (a << 10); \ 3092 c -= a; c -= b; c ^= (b >> 15); \ 3093 } while (/*CONSTCOND*/0) 3094 3095 static __inline uint32_t 3096 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3097 { 3098 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3099 3100 b += addr[5] << 8; 3101 b += addr[4]; 3102 a += addr[3] << 24; 3103 a += addr[2] << 16; 3104 a += addr[1] << 8; 3105 a += addr[0]; 3106 3107 mix(a, b, c); 3108 3109 return (c & BRIDGE_RTHASH_MASK); 3110 } 3111 3112 #undef mix 3113 3114 static int 3115 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3116 { 3117 int i, d; 3118 3119 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3120 d = ((int)a[i]) - ((int)b[i]); 3121 } 3122 3123 return (d); 3124 } 3125 3126 /* 3127 * bridge_rtnode_lookup: 3128 * 3129 * Look up a bridge route node for the specified destination. Compare the 3130 * vlan id or if zero then just return the first match. 3131 */ 3132 static struct bridge_rtnode * 3133 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3134 { 3135 struct bridge_rtnode *brt; 3136 uint32_t hash; 3137 int dir; 3138 3139 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3140 3141 hash = bridge_rthash(sc, addr); 3142 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3143 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3144 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3145 return (brt); 3146 if (dir > 0) 3147 return (NULL); 3148 } 3149 3150 return (NULL); 3151 } 3152 3153 /* 3154 * bridge_rtnode_insert: 3155 * 3156 * Insert the specified bridge node into the route table. We 3157 * assume the entry is not already in the table. 3158 */ 3159 static int 3160 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3161 { 3162 struct bridge_rtnode *lbrt; 3163 uint32_t hash; 3164 int dir; 3165 3166 BRIDGE_RT_LOCK_ASSERT(sc); 3167 3168 hash = bridge_rthash(sc, brt->brt_addr); 3169 3170 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3171 if (lbrt == NULL) { 3172 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3173 goto out; 3174 } 3175 3176 do { 3177 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3178 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3179 return (EEXIST); 3180 if (dir > 0) { 3181 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3182 goto out; 3183 } 3184 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3185 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3186 goto out; 3187 } 3188 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3189 } while (lbrt != NULL); 3190 3191 #ifdef DIAGNOSTIC 3192 panic("bridge_rtnode_insert: impossible"); 3193 #endif 3194 3195 out: 3196 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3197 sc->sc_brtcnt++; 3198 3199 return (0); 3200 } 3201 3202 static void 3203 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3204 { 3205 struct bridge_rtnode *brt; 3206 3207 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3208 3209 CURVNET_SET(brt->brt_vnet); 3210 uma_zfree(V_bridge_rtnode_zone, brt); 3211 CURVNET_RESTORE(); 3212 } 3213 3214 /* 3215 * bridge_rtnode_destroy: 3216 * 3217 * Destroy a bridge rtnode. 3218 */ 3219 static void 3220 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3221 { 3222 BRIDGE_RT_LOCK_ASSERT(sc); 3223 3224 CK_LIST_REMOVE(brt, brt_hash); 3225 3226 CK_LIST_REMOVE(brt, brt_list); 3227 sc->sc_brtcnt--; 3228 brt->brt_dst->bif_addrcnt--; 3229 3230 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3231 } 3232 3233 /* 3234 * bridge_rtable_expire: 3235 * 3236 * Set the expiry time for all routes on an interface. 3237 */ 3238 static void 3239 bridge_rtable_expire(struct ifnet *ifp, int age) 3240 { 3241 struct bridge_softc *sc = ifp->if_bridge; 3242 struct bridge_rtnode *brt; 3243 3244 CURVNET_SET(ifp->if_vnet); 3245 BRIDGE_RT_LOCK(sc); 3246 3247 /* 3248 * If the age is zero then flush, otherwise set all the expiry times to 3249 * age for the interface 3250 */ 3251 if (age == 0) 3252 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3253 else { 3254 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3255 /* Cap the expiry time to 'age' */ 3256 if (brt->brt_ifp == ifp && 3257 brt->brt_expire > time_uptime + age && 3258 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3259 brt->brt_expire = time_uptime + age; 3260 } 3261 } 3262 BRIDGE_RT_UNLOCK(sc); 3263 CURVNET_RESTORE(); 3264 } 3265 3266 /* 3267 * bridge_state_change: 3268 * 3269 * Callback from the bridgestp code when a port changes states. 3270 */ 3271 static void 3272 bridge_state_change(struct ifnet *ifp, int state) 3273 { 3274 struct bridge_softc *sc = ifp->if_bridge; 3275 static const char *stpstates[] = { 3276 "disabled", 3277 "listening", 3278 "learning", 3279 "forwarding", 3280 "blocking", 3281 "discarding" 3282 }; 3283 3284 CURVNET_SET(ifp->if_vnet); 3285 if (V_log_stp) 3286 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3287 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3288 CURVNET_RESTORE(); 3289 } 3290 3291 /* 3292 * Send bridge packets through pfil if they are one of the types pfil can deal 3293 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3294 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3295 * that interface. 3296 */ 3297 static int 3298 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3299 { 3300 int snap, error, i, hlen; 3301 struct ether_header *eh1, eh2; 3302 struct ip *ip; 3303 struct llc llc1; 3304 u_int16_t ether_type; 3305 pfil_return_t rv; 3306 3307 snap = 0; 3308 error = -1; /* Default error if not error == 0 */ 3309 3310 #if 0 3311 /* we may return with the IP fields swapped, ensure its not shared */ 3312 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3313 #endif 3314 3315 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3316 return (0); /* filtering is disabled */ 3317 3318 i = min((*mp)->m_pkthdr.len, max_protohdr); 3319 if ((*mp)->m_len < i) { 3320 *mp = m_pullup(*mp, i); 3321 if (*mp == NULL) { 3322 printf("%s: m_pullup failed\n", __func__); 3323 return (-1); 3324 } 3325 } 3326 3327 eh1 = mtod(*mp, struct ether_header *); 3328 ether_type = ntohs(eh1->ether_type); 3329 3330 /* 3331 * Check for SNAP/LLC. 3332 */ 3333 if (ether_type < ETHERMTU) { 3334 struct llc *llc2 = (struct llc *)(eh1 + 1); 3335 3336 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3337 llc2->llc_dsap == LLC_SNAP_LSAP && 3338 llc2->llc_ssap == LLC_SNAP_LSAP && 3339 llc2->llc_control == LLC_UI) { 3340 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3341 snap = 1; 3342 } 3343 } 3344 3345 /* 3346 * If we're trying to filter bridge traffic, don't look at anything 3347 * other than IP and ARP traffic. If the filter doesn't understand 3348 * IPv6, don't allow IPv6 through the bridge either. This is lame 3349 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3350 * but of course we don't have an AppleTalk filter to begin with. 3351 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3352 * ARP traffic.) 3353 */ 3354 switch (ether_type) { 3355 case ETHERTYPE_ARP: 3356 case ETHERTYPE_REVARP: 3357 if (V_pfil_ipfw_arp == 0) 3358 return (0); /* Automatically pass */ 3359 break; 3360 3361 case ETHERTYPE_IP: 3362 #ifdef INET6 3363 case ETHERTYPE_IPV6: 3364 #endif /* INET6 */ 3365 break; 3366 default: 3367 /* 3368 * Check to see if the user wants to pass non-ip 3369 * packets, these will not be checked by pfil(9) and 3370 * passed unconditionally so the default is to drop. 3371 */ 3372 if (V_pfil_onlyip) 3373 goto bad; 3374 } 3375 3376 /* Run the packet through pfil before stripping link headers */ 3377 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3378 dir == PFIL_OUT && ifp != NULL) { 3379 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 3380 case PFIL_DROPPED: 3381 return (EACCES); 3382 case PFIL_CONSUMED: 3383 return (0); 3384 } 3385 } 3386 3387 /* Strip off the Ethernet header and keep a copy. */ 3388 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3389 m_adj(*mp, ETHER_HDR_LEN); 3390 3391 /* Strip off snap header, if present */ 3392 if (snap) { 3393 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3394 m_adj(*mp, sizeof(struct llc)); 3395 } 3396 3397 /* 3398 * Check the IP header for alignment and errors 3399 */ 3400 if (dir == PFIL_IN) { 3401 switch (ether_type) { 3402 case ETHERTYPE_IP: 3403 error = bridge_ip_checkbasic(mp); 3404 break; 3405 #ifdef INET6 3406 case ETHERTYPE_IPV6: 3407 error = bridge_ip6_checkbasic(mp); 3408 break; 3409 #endif /* INET6 */ 3410 default: 3411 error = 0; 3412 } 3413 if (error) 3414 goto bad; 3415 } 3416 3417 error = 0; 3418 3419 /* 3420 * Run the packet through pfil 3421 */ 3422 rv = PFIL_PASS; 3423 switch (ether_type) { 3424 case ETHERTYPE_IP: 3425 /* 3426 * Run pfil on the member interface and the bridge, both can 3427 * be skipped by clearing pfil_member or pfil_bridge. 3428 * 3429 * Keep the order: 3430 * in_if -> bridge_if -> out_if 3431 */ 3432 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3433 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 3434 PFIL_PASS) 3435 break; 3436 3437 if (V_pfil_member && ifp != NULL) { 3438 rv = (dir == PFIL_OUT) ? 3439 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 3440 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 3441 if (rv != PFIL_PASS) 3442 break; 3443 } 3444 3445 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3446 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 3447 PFIL_PASS) 3448 break; 3449 3450 /* check if we need to fragment the packet */ 3451 /* bridge_fragment generates a mbuf chain of packets */ 3452 /* that already include eth headers */ 3453 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3454 i = (*mp)->m_pkthdr.len; 3455 if (i > ifp->if_mtu) { 3456 error = bridge_fragment(ifp, mp, &eh2, snap, 3457 &llc1); 3458 return (error); 3459 } 3460 } 3461 3462 /* Recalculate the ip checksum. */ 3463 ip = mtod(*mp, struct ip *); 3464 hlen = ip->ip_hl << 2; 3465 if (hlen < sizeof(struct ip)) 3466 goto bad; 3467 if (hlen > (*mp)->m_len) { 3468 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3469 goto bad; 3470 ip = mtod(*mp, struct ip *); 3471 if (ip == NULL) 3472 goto bad; 3473 } 3474 ip->ip_sum = 0; 3475 if (hlen == sizeof(struct ip)) 3476 ip->ip_sum = in_cksum_hdr(ip); 3477 else 3478 ip->ip_sum = in_cksum(*mp, hlen); 3479 3480 break; 3481 #ifdef INET6 3482 case ETHERTYPE_IPV6: 3483 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3484 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 3485 PFIL_PASS) 3486 break; 3487 3488 if (V_pfil_member && ifp != NULL) { 3489 rv = (dir == PFIL_OUT) ? 3490 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 3491 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 3492 if (rv != PFIL_PASS) 3493 break; 3494 } 3495 3496 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3497 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 3498 PFIL_PASS) 3499 break; 3500 break; 3501 #endif 3502 } 3503 3504 switch (rv) { 3505 case PFIL_CONSUMED: 3506 return (0); 3507 case PFIL_DROPPED: 3508 return (EACCES); 3509 default: 3510 break; 3511 } 3512 3513 error = -1; 3514 3515 /* 3516 * Finally, put everything back the way it was and return 3517 */ 3518 if (snap) { 3519 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3520 if (*mp == NULL) 3521 return (error); 3522 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3523 } 3524 3525 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3526 if (*mp == NULL) 3527 return (error); 3528 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3529 3530 return (0); 3531 3532 bad: 3533 m_freem(*mp); 3534 *mp = NULL; 3535 return (error); 3536 } 3537 3538 /* 3539 * Perform basic checks on header size since 3540 * pfil assumes ip_input has already processed 3541 * it for it. Cut-and-pasted from ip_input.c. 3542 * Given how simple the IPv6 version is, 3543 * does the IPv4 version really need to be 3544 * this complicated? 3545 * 3546 * XXX Should we update ipstat here, or not? 3547 * XXX Right now we update ipstat but not 3548 * XXX csum_counter. 3549 */ 3550 static int 3551 bridge_ip_checkbasic(struct mbuf **mp) 3552 { 3553 struct mbuf *m = *mp; 3554 struct ip *ip; 3555 int len, hlen; 3556 u_short sum; 3557 3558 if (*mp == NULL) 3559 return (-1); 3560 3561 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3562 if ((m = m_copyup(m, sizeof(struct ip), 3563 (max_linkhdr + 3) & ~3)) == NULL) { 3564 /* XXXJRT new stat, please */ 3565 KMOD_IPSTAT_INC(ips_toosmall); 3566 goto bad; 3567 } 3568 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3569 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3570 KMOD_IPSTAT_INC(ips_toosmall); 3571 goto bad; 3572 } 3573 } 3574 ip = mtod(m, struct ip *); 3575 if (ip == NULL) goto bad; 3576 3577 if (ip->ip_v != IPVERSION) { 3578 KMOD_IPSTAT_INC(ips_badvers); 3579 goto bad; 3580 } 3581 hlen = ip->ip_hl << 2; 3582 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3583 KMOD_IPSTAT_INC(ips_badhlen); 3584 goto bad; 3585 } 3586 if (hlen > m->m_len) { 3587 if ((m = m_pullup(m, hlen)) == NULL) { 3588 KMOD_IPSTAT_INC(ips_badhlen); 3589 goto bad; 3590 } 3591 ip = mtod(m, struct ip *); 3592 if (ip == NULL) goto bad; 3593 } 3594 3595 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3596 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3597 } else { 3598 if (hlen == sizeof(struct ip)) { 3599 sum = in_cksum_hdr(ip); 3600 } else { 3601 sum = in_cksum(m, hlen); 3602 } 3603 } 3604 if (sum) { 3605 KMOD_IPSTAT_INC(ips_badsum); 3606 goto bad; 3607 } 3608 3609 /* Retrieve the packet length. */ 3610 len = ntohs(ip->ip_len); 3611 3612 /* 3613 * Check for additional length bogosity 3614 */ 3615 if (len < hlen) { 3616 KMOD_IPSTAT_INC(ips_badlen); 3617 goto bad; 3618 } 3619 3620 /* 3621 * Check that the amount of data in the buffers 3622 * is as at least much as the IP header would have us expect. 3623 * Drop packet if shorter than we expect. 3624 */ 3625 if (m->m_pkthdr.len < len) { 3626 KMOD_IPSTAT_INC(ips_tooshort); 3627 goto bad; 3628 } 3629 3630 /* Checks out, proceed */ 3631 *mp = m; 3632 return (0); 3633 3634 bad: 3635 *mp = m; 3636 return (-1); 3637 } 3638 3639 #ifdef INET6 3640 /* 3641 * Same as above, but for IPv6. 3642 * Cut-and-pasted from ip6_input.c. 3643 * XXX Should we update ip6stat, or not? 3644 */ 3645 static int 3646 bridge_ip6_checkbasic(struct mbuf **mp) 3647 { 3648 struct mbuf *m = *mp; 3649 struct ip6_hdr *ip6; 3650 3651 /* 3652 * If the IPv6 header is not aligned, slurp it up into a new 3653 * mbuf with space for link headers, in the event we forward 3654 * it. Otherwise, if it is aligned, make sure the entire base 3655 * IPv6 header is in the first mbuf of the chain. 3656 */ 3657 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3658 struct ifnet *inifp = m->m_pkthdr.rcvif; 3659 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3660 (max_linkhdr + 3) & ~3)) == NULL) { 3661 /* XXXJRT new stat, please */ 3662 IP6STAT_INC(ip6s_toosmall); 3663 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3664 goto bad; 3665 } 3666 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3667 struct ifnet *inifp = m->m_pkthdr.rcvif; 3668 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3669 IP6STAT_INC(ip6s_toosmall); 3670 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3671 goto bad; 3672 } 3673 } 3674 3675 ip6 = mtod(m, struct ip6_hdr *); 3676 3677 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3678 IP6STAT_INC(ip6s_badvers); 3679 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3680 goto bad; 3681 } 3682 3683 /* Checks out, proceed */ 3684 *mp = m; 3685 return (0); 3686 3687 bad: 3688 *mp = m; 3689 return (-1); 3690 } 3691 #endif /* INET6 */ 3692 3693 /* 3694 * bridge_fragment: 3695 * 3696 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3697 */ 3698 static int 3699 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3700 int snap, struct llc *llc) 3701 { 3702 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3703 struct ip *ip; 3704 int error = -1; 3705 3706 if (m->m_len < sizeof(struct ip) && 3707 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3708 goto dropit; 3709 ip = mtod(m, struct ip *); 3710 3711 m->m_pkthdr.csum_flags |= CSUM_IP; 3712 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3713 if (error) 3714 goto dropit; 3715 3716 /* 3717 * Walk the chain and re-add the Ethernet header for 3718 * each mbuf packet. 3719 */ 3720 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3721 nextpkt = mcur->m_nextpkt; 3722 mcur->m_nextpkt = NULL; 3723 if (snap) { 3724 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3725 if (mcur == NULL) { 3726 error = ENOBUFS; 3727 if (mprev != NULL) 3728 mprev->m_nextpkt = nextpkt; 3729 goto dropit; 3730 } 3731 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3732 } 3733 3734 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3735 if (mcur == NULL) { 3736 error = ENOBUFS; 3737 if (mprev != NULL) 3738 mprev->m_nextpkt = nextpkt; 3739 goto dropit; 3740 } 3741 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3742 3743 /* 3744 * The previous two M_PREPEND could have inserted one or two 3745 * mbufs in front so we have to update the previous packet's 3746 * m_nextpkt. 3747 */ 3748 mcur->m_nextpkt = nextpkt; 3749 if (mprev != NULL) 3750 mprev->m_nextpkt = mcur; 3751 else { 3752 /* The first mbuf in the original chain needs to be 3753 * updated. */ 3754 *mp = mcur; 3755 } 3756 mprev = mcur; 3757 } 3758 3759 KMOD_IPSTAT_INC(ips_fragmented); 3760 return (error); 3761 3762 dropit: 3763 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3764 m = mcur->m_nextpkt; 3765 m_freem(mcur); 3766 } 3767 return (error); 3768 } 3769 3770 static void 3771 bridge_linkstate(struct ifnet *ifp) 3772 { 3773 struct bridge_softc *sc = ifp->if_bridge; 3774 struct bridge_iflist *bif; 3775 struct epoch_tracker et; 3776 3777 NET_EPOCH_ENTER(et); 3778 3779 bif = bridge_lookup_member_if(sc, ifp); 3780 if (bif == NULL) { 3781 NET_EPOCH_EXIT(et); 3782 return; 3783 } 3784 bridge_linkcheck(sc); 3785 3786 bstp_linkstate(&bif->bif_stp); 3787 3788 NET_EPOCH_EXIT(et); 3789 } 3790 3791 static void 3792 bridge_linkcheck(struct bridge_softc *sc) 3793 { 3794 struct bridge_iflist *bif; 3795 int new_link, hasls; 3796 3797 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3798 3799 new_link = LINK_STATE_DOWN; 3800 hasls = 0; 3801 /* Our link is considered up if at least one of our ports is active */ 3802 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3803 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3804 hasls++; 3805 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3806 new_link = LINK_STATE_UP; 3807 break; 3808 } 3809 } 3810 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3811 /* If no interfaces support link-state then we default to up */ 3812 new_link = LINK_STATE_UP; 3813 } 3814 if_link_state_change(sc->sc_ifp, new_link); 3815 } 3816