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sys/net/if_bridge.c
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1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/pfil.h> 114 #include <net/vnet.h> 115 116 #include <netinet/in.h> 117 #include <netinet/in_systm.h> 118 #include <netinet/in_var.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #ifdef INET6 122 #include <netinet/ip6.h> 123 #include <netinet6/ip6_var.h> 124 #include <netinet6/in6_ifattach.h> 125 #endif 126 #if defined(INET) || defined(INET6) 127 #include <netinet/ip_carp.h> 128 #endif 129 #include <machine/in_cksum.h> 130 #include <netinet/if_ether.h> 131 #include <net/bridgestp.h> 132 #include <net/if_bridgevar.h> 133 #include <net/if_llc.h> 134 #include <net/if_vlan_var.h> 135 136 #include <net/route.h> 137 138 #ifdef INET6 139 /* 140 * XXX: declare here to avoid to include many inet6 related files.. 141 * should be more generalized? 142 */ 143 extern void nd6_setmtu(struct ifnet *); 144 #endif 145 146 /* 147 * Size of the route hash table. Must be a power of two. 148 */ 149 #ifndef BRIDGE_RTHASH_SIZE 150 #define BRIDGE_RTHASH_SIZE 1024 151 #endif 152 153 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 154 155 /* 156 * Default maximum number of addresses to cache. 157 */ 158 #ifndef BRIDGE_RTABLE_MAX 159 #define BRIDGE_RTABLE_MAX 2000 160 #endif 161 162 /* 163 * Timeout (in seconds) for entries learned dynamically. 164 */ 165 #ifndef BRIDGE_RTABLE_TIMEOUT 166 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 167 #endif 168 169 /* 170 * Number of seconds between walks of the route list. 171 */ 172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 173 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 174 #endif 175 176 /* 177 * List of capabilities to possibly mask on the member interface. 178 */ 179 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 180 IFCAP_TXCSUM_IPV6) 181 182 /* 183 * List of capabilities to strip 184 */ 185 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 186 187 /* 188 * Bridge locking 189 * 190 * The bridge relies heavily on the epoch(9) system to protect its data 191 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 192 * must ensure there is only one writer at a time. 193 * 194 * That is: for read accesses we only need to be in NET_EPOCH, but for write 195 * accesses we must hold: 196 * 197 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 198 * - BRIDGE_LOCK, for any other change 199 * 200 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 201 * calls to bridge member interfaces and these ioctl()s can sleep. 202 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 203 * required while we're in NET_EPOCH and then we're not allowed to sleep. 204 */ 205 #define BRIDGE_LOCK_INIT(_sc) do { \ 206 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 207 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 208 } while (0) 209 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 210 sx_destroy(&(_sc)->sc_sx); \ 211 mtx_destroy(&(_sc)->sc_rt_mtx); \ 212 } while (0) 213 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 214 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 215 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 216 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 217 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 218 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 219 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 220 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 221 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 222 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 223 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 224 225 /* 226 * Bridge interface list entry. 227 */ 228 struct bridge_iflist { 229 CK_LIST_ENTRY(bridge_iflist) bif_next; 230 struct ifnet *bif_ifp; /* member if */ 231 struct bstp_port bif_stp; /* STP state */ 232 uint32_t bif_flags; /* member if flags */ 233 int bif_savedcaps; /* saved capabilities */ 234 uint32_t bif_addrmax; /* max # of addresses */ 235 uint32_t bif_addrcnt; /* cur. # of addresses */ 236 uint32_t bif_addrexceeded;/* # of address violations */ 237 238 struct epoch_context bif_epoch_ctx; 239 }; 240 241 /* 242 * Bridge route node. 243 */ 244 struct bridge_rtnode { 245 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 246 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 247 struct bridge_iflist *brt_dst; /* destination if */ 248 unsigned long brt_expire; /* expiration time */ 249 uint8_t brt_flags; /* address flags */ 250 uint8_t brt_addr[ETHER_ADDR_LEN]; 251 uint16_t brt_vlan; /* vlan id */ 252 253 struct vnet *brt_vnet; 254 struct epoch_context brt_epoch_ctx; 255 }; 256 #define brt_ifp brt_dst->bif_ifp 257 258 /* 259 * Software state for each bridge. 260 */ 261 struct bridge_softc { 262 struct ifnet *sc_ifp; /* make this an interface */ 263 LIST_ENTRY(bridge_softc) sc_list; 264 struct sx sc_sx; 265 struct mtx sc_rt_mtx; 266 uint32_t sc_brtmax; /* max # of addresses */ 267 uint32_t sc_brtcnt; /* cur. # of addresses */ 268 uint32_t sc_brttimeout; /* rt timeout in seconds */ 269 struct callout sc_brcallout; /* bridge callout */ 270 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 271 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 272 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 273 uint32_t sc_rthash_key; /* key for hash */ 274 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 275 struct bstp_state sc_stp; /* STP state */ 276 uint32_t sc_brtexceeded; /* # of cache drops */ 277 struct ifnet *sc_ifaddr; /* member mac copied from */ 278 struct ether_addr sc_defaddr; /* Default MAC address */ 279 280 struct epoch_context sc_epoch_ctx; 281 }; 282 283 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 284 #define V_bridge_list_sx VNET(bridge_list_sx) 285 static eventhandler_tag bridge_detach_cookie; 286 287 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 288 289 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 290 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 291 292 static int bridge_clone_create(struct if_clone *, int, caddr_t); 293 static void bridge_clone_destroy(struct ifnet *); 294 295 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 296 static void bridge_mutecaps(struct bridge_softc *); 297 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 298 int); 299 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 300 static void bridge_init(void *); 301 static void bridge_dummynet(struct mbuf *, struct ifnet *); 302 static void bridge_stop(struct ifnet *, int); 303 static int bridge_transmit(struct ifnet *, struct mbuf *); 304 #ifdef ALTQ 305 static void bridge_altq_start(if_t); 306 static int bridge_altq_transmit(if_t, struct mbuf *); 307 #endif 308 static void bridge_qflush(struct ifnet *); 309 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 310 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 311 struct rtentry *); 312 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 313 struct mbuf *); 314 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 315 316 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 317 struct mbuf *m); 318 319 static void bridge_timer(void *); 320 321 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 322 struct mbuf *, int); 323 static void bridge_span(struct bridge_softc *, struct mbuf *); 324 325 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 326 uint16_t, struct bridge_iflist *, int, uint8_t); 327 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 328 uint16_t); 329 static void bridge_rttrim(struct bridge_softc *); 330 static void bridge_rtage(struct bridge_softc *); 331 static void bridge_rtflush(struct bridge_softc *, int); 332 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 333 uint16_t); 334 335 static void bridge_rtable_init(struct bridge_softc *); 336 static void bridge_rtable_fini(struct bridge_softc *); 337 338 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 339 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 340 const uint8_t *, uint16_t); 341 static int bridge_rtnode_insert(struct bridge_softc *, 342 struct bridge_rtnode *); 343 static void bridge_rtnode_destroy(struct bridge_softc *, 344 struct bridge_rtnode *); 345 static void bridge_rtable_expire(struct ifnet *, int); 346 static void bridge_state_change(struct ifnet *, int); 347 348 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 349 const char *name); 350 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 351 struct ifnet *ifp); 352 static void bridge_delete_member(struct bridge_softc *, 353 struct bridge_iflist *, int); 354 static void bridge_delete_span(struct bridge_softc *, 355 struct bridge_iflist *); 356 357 static int bridge_ioctl_add(struct bridge_softc *, void *); 358 static int bridge_ioctl_del(struct bridge_softc *, void *); 359 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 360 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 361 static int bridge_ioctl_scache(struct bridge_softc *, void *); 362 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 363 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 364 static int bridge_ioctl_rts(struct bridge_softc *, void *); 365 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 366 static int bridge_ioctl_sto(struct bridge_softc *, void *); 367 static int bridge_ioctl_gto(struct bridge_softc *, void *); 368 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 369 static int bridge_ioctl_flush(struct bridge_softc *, void *); 370 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 371 static int bridge_ioctl_spri(struct bridge_softc *, void *); 372 static int bridge_ioctl_ght(struct bridge_softc *, void *); 373 static int bridge_ioctl_sht(struct bridge_softc *, void *); 374 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 375 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 376 static int bridge_ioctl_gma(struct bridge_softc *, void *); 377 static int bridge_ioctl_sma(struct bridge_softc *, void *); 378 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 379 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 380 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 381 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 382 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 383 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 384 static int bridge_ioctl_grte(struct bridge_softc *, void *); 385 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 386 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 387 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 388 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 389 int); 390 static int bridge_ip_checkbasic(struct mbuf **mp); 391 #ifdef INET6 392 static int bridge_ip6_checkbasic(struct mbuf **mp); 393 #endif /* INET6 */ 394 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 395 struct ether_header *, int, struct llc *); 396 static void bridge_linkstate(struct ifnet *ifp); 397 static void bridge_linkcheck(struct bridge_softc *sc); 398 399 400 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 401 #define VLANTAGOF(_m) \ 402 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 403 404 static struct bstp_cb_ops bridge_ops = { 405 .bcb_state = bridge_state_change, 406 .bcb_rtage = bridge_rtable_expire 407 }; 408 409 SYSCTL_DECL(_net_link); 410 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 411 412 /* only pass IP[46] packets when pfil is enabled */ 413 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 414 #define V_pfil_onlyip VNET(pfil_onlyip) 415 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 416 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 417 "Only pass IP packets when pfil is enabled"); 418 419 /* run pfil hooks on the bridge interface */ 420 VNET_DEFINE_STATIC(int, pfil_bridge) = 1; 421 #define V_pfil_bridge VNET(pfil_bridge) 422 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 423 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 424 "Packet filter on the bridge interface"); 425 426 /* layer2 filter with ipfw */ 427 VNET_DEFINE_STATIC(int, pfil_ipfw); 428 #define V_pfil_ipfw VNET(pfil_ipfw) 429 430 /* layer2 ARP filter with ipfw */ 431 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 432 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 433 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 434 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 435 "Filter ARP packets through IPFW layer2"); 436 437 /* run pfil hooks on the member interface */ 438 VNET_DEFINE_STATIC(int, pfil_member) = 1; 439 #define V_pfil_member VNET(pfil_member) 440 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 441 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 442 "Packet filter on the member interface"); 443 444 /* run pfil hooks on the physical interface for locally destined packets */ 445 VNET_DEFINE_STATIC(int, pfil_local_phys); 446 #define V_pfil_local_phys VNET(pfil_local_phys) 447 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 448 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 449 "Packet filter on the physical interface for locally destined packets"); 450 451 /* log STP state changes */ 452 VNET_DEFINE_STATIC(int, log_stp); 453 #define V_log_stp VNET(log_stp) 454 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 455 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 456 "Log STP state changes"); 457 458 /* share MAC with first bridge member */ 459 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 460 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 461 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 462 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 463 "Inherit MAC address from the first bridge member"); 464 465 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 466 #define V_allow_llz_overlap VNET(allow_llz_overlap) 467 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 468 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 469 "Allow overlap of link-local scope " 470 "zones of a bridge interface and the member interfaces"); 471 472 struct bridge_control { 473 int (*bc_func)(struct bridge_softc *, void *); 474 int bc_argsize; 475 int bc_flags; 476 }; 477 478 #define BC_F_COPYIN 0x01 /* copy arguments in */ 479 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 480 #define BC_F_SUSER 0x04 /* do super-user check */ 481 482 const struct bridge_control bridge_control_table[] = { 483 { bridge_ioctl_add, sizeof(struct ifbreq), 484 BC_F_COPYIN|BC_F_SUSER }, 485 { bridge_ioctl_del, sizeof(struct ifbreq), 486 BC_F_COPYIN|BC_F_SUSER }, 487 488 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 489 BC_F_COPYIN|BC_F_COPYOUT }, 490 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 491 BC_F_COPYIN|BC_F_SUSER }, 492 493 { bridge_ioctl_scache, sizeof(struct ifbrparam), 494 BC_F_COPYIN|BC_F_SUSER }, 495 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 496 BC_F_COPYOUT }, 497 498 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 499 BC_F_COPYIN|BC_F_COPYOUT }, 500 { bridge_ioctl_rts, sizeof(struct ifbaconf), 501 BC_F_COPYIN|BC_F_COPYOUT }, 502 503 { bridge_ioctl_saddr, sizeof(struct ifbareq), 504 BC_F_COPYIN|BC_F_SUSER }, 505 506 { bridge_ioctl_sto, sizeof(struct ifbrparam), 507 BC_F_COPYIN|BC_F_SUSER }, 508 { bridge_ioctl_gto, sizeof(struct ifbrparam), 509 BC_F_COPYOUT }, 510 511 { bridge_ioctl_daddr, sizeof(struct ifbareq), 512 BC_F_COPYIN|BC_F_SUSER }, 513 514 { bridge_ioctl_flush, sizeof(struct ifbreq), 515 BC_F_COPYIN|BC_F_SUSER }, 516 517 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 518 BC_F_COPYOUT }, 519 { bridge_ioctl_spri, sizeof(struct ifbrparam), 520 BC_F_COPYIN|BC_F_SUSER }, 521 522 { bridge_ioctl_ght, sizeof(struct ifbrparam), 523 BC_F_COPYOUT }, 524 { bridge_ioctl_sht, sizeof(struct ifbrparam), 525 BC_F_COPYIN|BC_F_SUSER }, 526 527 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 528 BC_F_COPYOUT }, 529 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 530 BC_F_COPYIN|BC_F_SUSER }, 531 532 { bridge_ioctl_gma, sizeof(struct ifbrparam), 533 BC_F_COPYOUT }, 534 { bridge_ioctl_sma, sizeof(struct ifbrparam), 535 BC_F_COPYIN|BC_F_SUSER }, 536 537 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 538 BC_F_COPYIN|BC_F_SUSER }, 539 540 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 541 BC_F_COPYIN|BC_F_SUSER }, 542 543 { bridge_ioctl_addspan, sizeof(struct ifbreq), 544 BC_F_COPYIN|BC_F_SUSER }, 545 { bridge_ioctl_delspan, sizeof(struct ifbreq), 546 BC_F_COPYIN|BC_F_SUSER }, 547 548 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 549 BC_F_COPYOUT }, 550 551 { bridge_ioctl_grte, sizeof(struct ifbrparam), 552 BC_F_COPYOUT }, 553 554 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 555 BC_F_COPYIN|BC_F_COPYOUT }, 556 557 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 558 BC_F_COPYIN|BC_F_SUSER }, 559 560 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 561 BC_F_COPYIN|BC_F_SUSER }, 562 563 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 564 BC_F_COPYIN|BC_F_SUSER }, 565 566 }; 567 const int bridge_control_table_size = nitems(bridge_control_table); 568 569 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 570 #define V_bridge_list VNET(bridge_list) 571 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 572 "if_bridge list") 573 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 574 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 575 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 576 577 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 578 #define V_bridge_cloner VNET(bridge_cloner) 579 580 static const char bridge_name[] = "bridge"; 581 582 static void 583 vnet_bridge_init(const void *unused __unused) 584 { 585 586 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 587 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 588 UMA_ALIGN_PTR, 0); 589 BRIDGE_LIST_LOCK_INIT(); 590 LIST_INIT(&V_bridge_list); 591 V_bridge_cloner = if_clone_simple(bridge_name, 592 bridge_clone_create, bridge_clone_destroy, 0); 593 } 594 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 595 vnet_bridge_init, NULL); 596 597 static void 598 vnet_bridge_uninit(const void *unused __unused) 599 { 600 601 if_clone_detach(V_bridge_cloner); 602 V_bridge_cloner = NULL; 603 BRIDGE_LIST_LOCK_DESTROY(); 604 605 /* Before we can destroy the uma zone, because there are callbacks that 606 * use it. */ 607 epoch_drain_callbacks(net_epoch_preempt); 608 609 uma_zdestroy(V_bridge_rtnode_zone); 610 } 611 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 612 vnet_bridge_uninit, NULL); 613 614 static int 615 bridge_modevent(module_t mod, int type, void *data) 616 { 617 618 switch (type) { 619 case MOD_LOAD: 620 bridge_dn_p = bridge_dummynet; 621 bridge_detach_cookie = EVENTHANDLER_REGISTER( 622 ifnet_departure_event, bridge_ifdetach, NULL, 623 EVENTHANDLER_PRI_ANY); 624 break; 625 case MOD_UNLOAD: 626 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 627 bridge_detach_cookie); 628 bridge_dn_p = NULL; 629 break; 630 default: 631 return (EOPNOTSUPP); 632 } 633 return (0); 634 } 635 636 static moduledata_t bridge_mod = { 637 "if_bridge", 638 bridge_modevent, 639 0 640 }; 641 642 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 643 MODULE_VERSION(if_bridge, 1); 644 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 645 646 /* 647 * handler for net.link.bridge.ipfw 648 */ 649 static int 650 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 651 { 652 int enable = V_pfil_ipfw; 653 int error; 654 655 error = sysctl_handle_int(oidp, &enable, 0, req); 656 enable &= 1; 657 658 if (enable != V_pfil_ipfw) { 659 V_pfil_ipfw = enable; 660 661 /* 662 * Disable pfil so that ipfw doesnt run twice, if the user 663 * really wants both then they can re-enable pfil_bridge and/or 664 * pfil_member. Also allow non-ip packets as ipfw can filter by 665 * layer2 type. 666 */ 667 if (V_pfil_ipfw) { 668 V_pfil_onlyip = 0; 669 V_pfil_bridge = 0; 670 V_pfil_member = 0; 671 } 672 } 673 674 return (error); 675 } 676 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 677 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET, 678 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 679 "Layer2 filter with IPFW"); 680 681 #ifdef VIMAGE 682 static void 683 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 684 { 685 struct bridge_softc *sc = ifp->if_softc; 686 struct bridge_iflist *bif; 687 688 BRIDGE_LOCK(sc); 689 690 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 691 bridge_delete_member(sc, bif, 0); 692 693 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 694 bridge_delete_span(sc, bif); 695 } 696 697 BRIDGE_UNLOCK(sc); 698 699 ether_reassign(ifp, newvnet, arg); 700 } 701 #endif 702 703 /* 704 * bridge_clone_create: 705 * 706 * Create a new bridge instance. 707 */ 708 static int 709 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 710 { 711 struct bridge_softc *sc, *sc2; 712 struct ifnet *bifp, *ifp; 713 int fb, retry; 714 unsigned long hostid; 715 716 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 717 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 718 if (ifp == NULL) { 719 free(sc, M_DEVBUF); 720 return (ENOSPC); 721 } 722 723 BRIDGE_LOCK_INIT(sc); 724 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 725 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 726 727 /* Initialize our routing table. */ 728 bridge_rtable_init(sc); 729 730 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 731 732 CK_LIST_INIT(&sc->sc_iflist); 733 CK_LIST_INIT(&sc->sc_spanlist); 734 735 ifp->if_softc = sc; 736 if_initname(ifp, bridge_name, unit); 737 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 738 ifp->if_ioctl = bridge_ioctl; 739 #ifdef ALTQ 740 ifp->if_start = bridge_altq_start; 741 ifp->if_transmit = bridge_altq_transmit; 742 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 743 ifp->if_snd.ifq_drv_maxlen = 0; 744 IFQ_SET_READY(&ifp->if_snd); 745 #else 746 ifp->if_transmit = bridge_transmit; 747 #endif 748 ifp->if_qflush = bridge_qflush; 749 ifp->if_init = bridge_init; 750 ifp->if_type = IFT_BRIDGE; 751 752 /* 753 * Generate an ethernet address with a locally administered address. 754 * 755 * Since we are using random ethernet addresses for the bridge, it is 756 * possible that we might have address collisions, so make sure that 757 * this hardware address isn't already in use on another bridge. 758 * The first try uses the hostid and falls back to arc4rand(). 759 */ 760 fb = 0; 761 getcredhostid(curthread->td_ucred, &hostid); 762 do { 763 if (fb || hostid == 0) { 764 ether_gen_addr(ifp, &sc->sc_defaddr); 765 } else { 766 sc->sc_defaddr.octet[0] = 0x2; 767 sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff; 768 sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff; 769 sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff; 770 sc->sc_defaddr.octet[4] = hostid & 0xff; 771 sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff; 772 } 773 774 fb = 1; 775 retry = 0; 776 BRIDGE_LIST_LOCK(); 777 LIST_FOREACH(sc2, &V_bridge_list, sc_list) { 778 bifp = sc2->sc_ifp; 779 if (memcmp(sc->sc_defaddr.octet, 780 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 781 retry = 1; 782 break; 783 } 784 } 785 BRIDGE_LIST_UNLOCK(); 786 } while (retry == 1); 787 788 bstp_attach(&sc->sc_stp, &bridge_ops); 789 ether_ifattach(ifp, sc->sc_defaddr.octet); 790 /* Now undo some of the damage... */ 791 ifp->if_baudrate = 0; 792 ifp->if_type = IFT_BRIDGE; 793 #ifdef VIMAGE 794 ifp->if_reassign = bridge_reassign; 795 #endif 796 797 BRIDGE_LIST_LOCK(); 798 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 799 BRIDGE_LIST_UNLOCK(); 800 801 return (0); 802 } 803 804 static void 805 bridge_clone_destroy_cb(struct epoch_context *ctx) 806 { 807 struct bridge_softc *sc; 808 809 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 810 811 BRIDGE_LOCK_DESTROY(sc); 812 free(sc, M_DEVBUF); 813 } 814 815 /* 816 * bridge_clone_destroy: 817 * 818 * Destroy a bridge instance. 819 */ 820 static void 821 bridge_clone_destroy(struct ifnet *ifp) 822 { 823 struct bridge_softc *sc = ifp->if_softc; 824 struct bridge_iflist *bif; 825 struct epoch_tracker et; 826 827 BRIDGE_LOCK(sc); 828 829 bridge_stop(ifp, 1); 830 ifp->if_flags &= ~IFF_UP; 831 832 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 833 bridge_delete_member(sc, bif, 0); 834 835 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 836 bridge_delete_span(sc, bif); 837 } 838 839 /* Tear down the routing table. */ 840 bridge_rtable_fini(sc); 841 842 BRIDGE_UNLOCK(sc); 843 844 NET_EPOCH_ENTER_ET(et); 845 846 callout_drain(&sc->sc_brcallout); 847 848 BRIDGE_LIST_LOCK(); 849 LIST_REMOVE(sc, sc_list); 850 BRIDGE_LIST_UNLOCK(); 851 852 bstp_detach(&sc->sc_stp); 853 #ifdef ALTQ 854 IFQ_PURGE(&ifp->if_snd); 855 #endif 856 NET_EPOCH_EXIT_ET(et); 857 858 ether_ifdetach(ifp); 859 if_free(ifp); 860 861 epoch_call(net_epoch_preempt, &sc->sc_epoch_ctx, bridge_clone_destroy_cb); 862 } 863 864 /* 865 * bridge_ioctl: 866 * 867 * Handle a control request from the operator. 868 */ 869 static int 870 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 871 { 872 struct bridge_softc *sc = ifp->if_softc; 873 struct ifreq *ifr = (struct ifreq *)data; 874 struct bridge_iflist *bif; 875 struct thread *td = curthread; 876 union { 877 struct ifbreq ifbreq; 878 struct ifbifconf ifbifconf; 879 struct ifbareq ifbareq; 880 struct ifbaconf ifbaconf; 881 struct ifbrparam ifbrparam; 882 struct ifbropreq ifbropreq; 883 } args; 884 struct ifdrv *ifd = (struct ifdrv *) data; 885 const struct bridge_control *bc; 886 int error = 0, oldmtu; 887 888 BRIDGE_LOCK(sc); 889 890 switch (cmd) { 891 892 case SIOCADDMULTI: 893 case SIOCDELMULTI: 894 break; 895 896 case SIOCGDRVSPEC: 897 case SIOCSDRVSPEC: 898 if (ifd->ifd_cmd >= bridge_control_table_size) { 899 error = EINVAL; 900 break; 901 } 902 bc = &bridge_control_table[ifd->ifd_cmd]; 903 904 if (cmd == SIOCGDRVSPEC && 905 (bc->bc_flags & BC_F_COPYOUT) == 0) { 906 error = EINVAL; 907 break; 908 } 909 else if (cmd == SIOCSDRVSPEC && 910 (bc->bc_flags & BC_F_COPYOUT) != 0) { 911 error = EINVAL; 912 break; 913 } 914 915 if (bc->bc_flags & BC_F_SUSER) { 916 error = priv_check(td, PRIV_NET_BRIDGE); 917 if (error) 918 break; 919 } 920 921 if (ifd->ifd_len != bc->bc_argsize || 922 ifd->ifd_len > sizeof(args)) { 923 error = EINVAL; 924 break; 925 } 926 927 bzero(&args, sizeof(args)); 928 if (bc->bc_flags & BC_F_COPYIN) { 929 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 930 if (error) 931 break; 932 } 933 934 oldmtu = ifp->if_mtu; 935 error = (*bc->bc_func)(sc, &args); 936 if (error) 937 break; 938 939 /* 940 * Bridge MTU may change during addition of the first port. 941 * If it did, do network layer specific procedure. 942 */ 943 if (ifp->if_mtu != oldmtu) { 944 #ifdef INET6 945 nd6_setmtu(ifp); 946 #endif 947 rt_updatemtu(ifp); 948 } 949 950 if (bc->bc_flags & BC_F_COPYOUT) 951 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 952 953 break; 954 955 case SIOCSIFFLAGS: 956 if (!(ifp->if_flags & IFF_UP) && 957 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 958 /* 959 * If interface is marked down and it is running, 960 * then stop and disable it. 961 */ 962 bridge_stop(ifp, 1); 963 } else if ((ifp->if_flags & IFF_UP) && 964 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 965 /* 966 * If interface is marked up and it is stopped, then 967 * start it. 968 */ 969 BRIDGE_UNLOCK(sc); 970 (*ifp->if_init)(sc); 971 BRIDGE_LOCK(sc); 972 } 973 break; 974 975 case SIOCSIFMTU: 976 if (ifr->ifr_mtu < 576) { 977 error = EINVAL; 978 break; 979 } 980 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 981 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 982 break; 983 } 984 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 985 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 986 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 987 " != %d\n", sc->sc_ifp->if_xname, 988 bif->bif_ifp->if_mtu, 989 bif->bif_ifp->if_xname, ifr->ifr_mtu); 990 error = EINVAL; 991 break; 992 } 993 } 994 if (!error) 995 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 996 break; 997 default: 998 /* 999 * drop the lock as ether_ioctl() will call bridge_start() and 1000 * cause the lock to be recursed. 1001 */ 1002 BRIDGE_UNLOCK(sc); 1003 error = ether_ioctl(ifp, cmd, data); 1004 BRIDGE_LOCK(sc); 1005 break; 1006 } 1007 1008 BRIDGE_UNLOCK(sc); 1009 1010 return (error); 1011 } 1012 1013 /* 1014 * bridge_mutecaps: 1015 * 1016 * Clear or restore unwanted capabilities on the member interface 1017 */ 1018 static void 1019 bridge_mutecaps(struct bridge_softc *sc) 1020 { 1021 struct bridge_iflist *bif; 1022 int enabled, mask; 1023 1024 BRIDGE_LOCK_ASSERT(sc); 1025 1026 /* Initial bitmask of capabilities to test */ 1027 mask = BRIDGE_IFCAPS_MASK; 1028 1029 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1030 /* Every member must support it or its disabled */ 1031 mask &= bif->bif_savedcaps; 1032 } 1033 1034 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1035 enabled = bif->bif_ifp->if_capenable; 1036 enabled &= ~BRIDGE_IFCAPS_STRIP; 1037 /* strip off mask bits and enable them again if allowed */ 1038 enabled &= ~BRIDGE_IFCAPS_MASK; 1039 enabled |= mask; 1040 bridge_set_ifcap(sc, bif, enabled); 1041 } 1042 } 1043 1044 static void 1045 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1046 { 1047 struct ifnet *ifp = bif->bif_ifp; 1048 struct ifreq ifr; 1049 int error, mask, stuck; 1050 1051 bzero(&ifr, sizeof(ifr)); 1052 ifr.ifr_reqcap = set; 1053 1054 if (ifp->if_capenable != set) { 1055 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1056 if (error) 1057 if_printf(sc->sc_ifp, 1058 "error setting capabilities on %s: %d\n", 1059 ifp->if_xname, error); 1060 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1061 stuck = ifp->if_capenable & mask & ~set; 1062 if (stuck != 0) 1063 if_printf(sc->sc_ifp, 1064 "can't disable some capabilities on %s: 0x%x\n", 1065 ifp->if_xname, stuck); 1066 } 1067 } 1068 1069 /* 1070 * bridge_lookup_member: 1071 * 1072 * Lookup a bridge member interface. 1073 */ 1074 static struct bridge_iflist * 1075 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1076 { 1077 struct bridge_iflist *bif; 1078 struct ifnet *ifp; 1079 1080 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1081 1082 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1083 ifp = bif->bif_ifp; 1084 if (strcmp(ifp->if_xname, name) == 0) 1085 return (bif); 1086 } 1087 1088 return (NULL); 1089 } 1090 1091 /* 1092 * bridge_lookup_member_if: 1093 * 1094 * Lookup a bridge member interface by ifnet*. 1095 */ 1096 static struct bridge_iflist * 1097 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1098 { 1099 struct bridge_iflist *bif; 1100 1101 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1102 1103 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1104 if (bif->bif_ifp == member_ifp) 1105 return (bif); 1106 } 1107 1108 return (NULL); 1109 } 1110 1111 static void 1112 bridge_delete_member_cb(struct epoch_context *ctx) 1113 { 1114 struct bridge_iflist *bif; 1115 1116 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1117 1118 free(bif, M_DEVBUF); 1119 } 1120 1121 /* 1122 * bridge_delete_member: 1123 * 1124 * Delete the specified member interface. 1125 */ 1126 static void 1127 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1128 int gone) 1129 { 1130 struct ifnet *ifs = bif->bif_ifp; 1131 struct ifnet *fif = NULL; 1132 struct bridge_iflist *bifl; 1133 1134 BRIDGE_LOCK_ASSERT(sc); 1135 1136 if (bif->bif_flags & IFBIF_STP) 1137 bstp_disable(&bif->bif_stp); 1138 1139 ifs->if_bridge = NULL; 1140 CK_LIST_REMOVE(bif, bif_next); 1141 1142 /* 1143 * If removing the interface that gave the bridge its mac address, set 1144 * the mac address of the bridge to the address of the next member, or 1145 * to its default address if no members are left. 1146 */ 1147 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1148 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1149 bcopy(&sc->sc_defaddr, 1150 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1151 sc->sc_ifaddr = NULL; 1152 } else { 1153 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1154 fif = bifl->bif_ifp; 1155 bcopy(IF_LLADDR(fif), 1156 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1157 sc->sc_ifaddr = fif; 1158 } 1159 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1160 } 1161 1162 bridge_linkcheck(sc); 1163 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1164 BRIDGE_RT_LOCK(sc); 1165 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1166 BRIDGE_RT_UNLOCK(sc); 1167 KASSERT(bif->bif_addrcnt == 0, 1168 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1169 1170 ifs->if_bridge_output = NULL; 1171 ifs->if_bridge_input = NULL; 1172 ifs->if_bridge_linkstate = NULL; 1173 if (!gone) { 1174 switch (ifs->if_type) { 1175 case IFT_ETHER: 1176 case IFT_L2VLAN: 1177 /* 1178 * Take the interface out of promiscuous mode, but only 1179 * if it was promiscuous in the first place. It might 1180 * not be if we're in the bridge_ioctl_add() error path. 1181 */ 1182 if (ifs->if_flags & IFF_PROMISC) 1183 (void) ifpromisc(ifs, 0); 1184 break; 1185 1186 case IFT_GIF: 1187 break; 1188 1189 default: 1190 #ifdef DIAGNOSTIC 1191 panic("bridge_delete_member: impossible"); 1192 #endif 1193 break; 1194 } 1195 /* reneable any interface capabilities */ 1196 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1197 } 1198 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1199 1200 epoch_call(net_epoch_preempt, &bif->bif_epoch_ctx, 1201 bridge_delete_member_cb); 1202 } 1203 1204 /* 1205 * bridge_delete_span: 1206 * 1207 * Delete the specified span interface. 1208 */ 1209 static void 1210 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1211 { 1212 BRIDGE_LOCK_ASSERT(sc); 1213 1214 KASSERT(bif->bif_ifp->if_bridge == NULL, 1215 ("%s: not a span interface", __func__)); 1216 1217 CK_LIST_REMOVE(bif, bif_next); 1218 1219 epoch_call(net_epoch_preempt, &bif->bif_epoch_ctx, 1220 bridge_delete_member_cb); 1221 } 1222 1223 static int 1224 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1225 { 1226 struct ifbreq *req = arg; 1227 struct bridge_iflist *bif = NULL; 1228 struct ifnet *ifs; 1229 int error = 0; 1230 1231 ifs = ifunit(req->ifbr_ifsname); 1232 if (ifs == NULL) 1233 return (ENOENT); 1234 if (ifs->if_ioctl == NULL) /* must be supported */ 1235 return (EINVAL); 1236 1237 /* If it's in the span list, it can't be a member. */ 1238 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1239 if (ifs == bif->bif_ifp) 1240 return (EBUSY); 1241 1242 if (ifs->if_bridge == sc) 1243 return (EEXIST); 1244 1245 if (ifs->if_bridge != NULL) 1246 return (EBUSY); 1247 1248 switch (ifs->if_type) { 1249 case IFT_ETHER: 1250 case IFT_L2VLAN: 1251 case IFT_GIF: 1252 /* permitted interface types */ 1253 break; 1254 default: 1255 return (EINVAL); 1256 } 1257 1258 #ifdef INET6 1259 /* 1260 * Two valid inet6 addresses with link-local scope must not be 1261 * on the parent interface and the member interfaces at the 1262 * same time. This restriction is needed to prevent violation 1263 * of link-local scope zone. Attempts to add a member 1264 * interface which has inet6 addresses when the parent has 1265 * inet6 triggers removal of all inet6 addresses on the member 1266 * interface. 1267 */ 1268 1269 /* Check if the parent interface has a link-local scope addr. */ 1270 if (V_allow_llz_overlap == 0 && 1271 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1272 /* 1273 * If any, remove all inet6 addresses from the member 1274 * interfaces. 1275 */ 1276 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1277 if (in6ifa_llaonifp(bif->bif_ifp)) { 1278 in6_ifdetach(bif->bif_ifp); 1279 if_printf(sc->sc_ifp, 1280 "IPv6 addresses on %s have been removed " 1281 "before adding it as a member to prevent " 1282 "IPv6 address scope violation.\n", 1283 bif->bif_ifp->if_xname); 1284 } 1285 } 1286 if (in6ifa_llaonifp(ifs)) { 1287 in6_ifdetach(ifs); 1288 if_printf(sc->sc_ifp, 1289 "IPv6 addresses on %s have been removed " 1290 "before adding it as a member to prevent " 1291 "IPv6 address scope violation.\n", 1292 ifs->if_xname); 1293 } 1294 } 1295 #endif 1296 /* Allow the first Ethernet member to define the MTU */ 1297 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1298 sc->sc_ifp->if_mtu = ifs->if_mtu; 1299 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1300 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1301 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1302 return (EINVAL); 1303 } 1304 1305 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1306 if (bif == NULL) 1307 return (ENOMEM); 1308 1309 bif->bif_ifp = ifs; 1310 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1311 bif->bif_savedcaps = ifs->if_capenable; 1312 1313 /* 1314 * Assign the interface's MAC address to the bridge if it's the first 1315 * member and the MAC address of the bridge has not been changed from 1316 * the default randomly generated one. 1317 */ 1318 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1319 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1320 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1321 sc->sc_ifaddr = ifs; 1322 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1323 } 1324 1325 ifs->if_bridge = sc; 1326 ifs->if_bridge_output = bridge_output; 1327 ifs->if_bridge_input = bridge_input; 1328 ifs->if_bridge_linkstate = bridge_linkstate; 1329 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1330 /* 1331 * XXX: XLOCK HERE!?! 1332 * 1333 * NOTE: insert_***HEAD*** should be safe for the traversals. 1334 */ 1335 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1336 1337 /* Set interface capabilities to the intersection set of all members */ 1338 bridge_mutecaps(sc); 1339 bridge_linkcheck(sc); 1340 1341 /* Place the interface into promiscuous mode */ 1342 switch (ifs->if_type) { 1343 case IFT_ETHER: 1344 case IFT_L2VLAN: 1345 error = ifpromisc(ifs, 1); 1346 break; 1347 } 1348 1349 if (error) 1350 bridge_delete_member(sc, bif, 0); 1351 return (error); 1352 } 1353 1354 static int 1355 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1356 { 1357 struct ifbreq *req = arg; 1358 struct bridge_iflist *bif; 1359 1360 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1361 if (bif == NULL) 1362 return (ENOENT); 1363 1364 bridge_delete_member(sc, bif, 0); 1365 1366 return (0); 1367 } 1368 1369 static int 1370 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1371 { 1372 struct ifbreq *req = arg; 1373 struct bridge_iflist *bif; 1374 struct bstp_port *bp; 1375 1376 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1377 if (bif == NULL) 1378 return (ENOENT); 1379 1380 bp = &bif->bif_stp; 1381 req->ifbr_ifsflags = bif->bif_flags; 1382 req->ifbr_state = bp->bp_state; 1383 req->ifbr_priority = bp->bp_priority; 1384 req->ifbr_path_cost = bp->bp_path_cost; 1385 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1386 req->ifbr_proto = bp->bp_protover; 1387 req->ifbr_role = bp->bp_role; 1388 req->ifbr_stpflags = bp->bp_flags; 1389 req->ifbr_addrcnt = bif->bif_addrcnt; 1390 req->ifbr_addrmax = bif->bif_addrmax; 1391 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1392 1393 /* Copy STP state options as flags */ 1394 if (bp->bp_operedge) 1395 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1396 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1397 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1398 if (bp->bp_ptp_link) 1399 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1400 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1401 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1402 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1403 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1404 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1405 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1406 return (0); 1407 } 1408 1409 static int 1410 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1411 { 1412 struct ifbreq *req = arg; 1413 struct bridge_iflist *bif; 1414 struct bstp_port *bp; 1415 int error; 1416 1417 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1418 if (bif == NULL) 1419 return (ENOENT); 1420 bp = &bif->bif_stp; 1421 1422 if (req->ifbr_ifsflags & IFBIF_SPAN) 1423 /* SPAN is readonly */ 1424 return (EINVAL); 1425 1426 NET_EPOCH_ENTER(); 1427 1428 if (req->ifbr_ifsflags & IFBIF_STP) { 1429 if ((bif->bif_flags & IFBIF_STP) == 0) { 1430 error = bstp_enable(&bif->bif_stp); 1431 if (error) { 1432 NET_EPOCH_EXIT(); 1433 return (error); 1434 } 1435 } 1436 } else { 1437 if ((bif->bif_flags & IFBIF_STP) != 0) 1438 bstp_disable(&bif->bif_stp); 1439 } 1440 1441 /* Pass on STP flags */ 1442 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1443 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1444 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1445 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1446 1447 /* Save the bits relating to the bridge */ 1448 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1449 1450 NET_EPOCH_EXIT(); 1451 1452 return (0); 1453 } 1454 1455 static int 1456 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1457 { 1458 struct ifbrparam *param = arg; 1459 1460 sc->sc_brtmax = param->ifbrp_csize; 1461 bridge_rttrim(sc); 1462 1463 return (0); 1464 } 1465 1466 static int 1467 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1468 { 1469 struct ifbrparam *param = arg; 1470 1471 param->ifbrp_csize = sc->sc_brtmax; 1472 1473 return (0); 1474 } 1475 1476 static int 1477 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1478 { 1479 struct ifbifconf *bifc = arg; 1480 struct bridge_iflist *bif; 1481 struct ifbreq breq; 1482 char *buf, *outbuf; 1483 int count, buflen, len, error = 0; 1484 1485 count = 0; 1486 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1487 count++; 1488 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1489 count++; 1490 1491 buflen = sizeof(breq) * count; 1492 if (bifc->ifbic_len == 0) { 1493 bifc->ifbic_len = buflen; 1494 return (0); 1495 } 1496 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1497 if (outbuf == NULL) 1498 return (ENOMEM); 1499 1500 count = 0; 1501 buf = outbuf; 1502 len = min(bifc->ifbic_len, buflen); 1503 bzero(&breq, sizeof(breq)); 1504 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1505 if (len < sizeof(breq)) 1506 break; 1507 1508 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1509 sizeof(breq.ifbr_ifsname)); 1510 /* Fill in the ifbreq structure */ 1511 error = bridge_ioctl_gifflags(sc, &breq); 1512 if (error) 1513 break; 1514 memcpy(buf, &breq, sizeof(breq)); 1515 count++; 1516 buf += sizeof(breq); 1517 len -= sizeof(breq); 1518 } 1519 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1520 if (len < sizeof(breq)) 1521 break; 1522 1523 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1524 sizeof(breq.ifbr_ifsname)); 1525 breq.ifbr_ifsflags = bif->bif_flags; 1526 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1527 memcpy(buf, &breq, sizeof(breq)); 1528 count++; 1529 buf += sizeof(breq); 1530 len -= sizeof(breq); 1531 } 1532 1533 bifc->ifbic_len = sizeof(breq) * count; 1534 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1535 free(outbuf, M_TEMP); 1536 return (error); 1537 } 1538 1539 static int 1540 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1541 { 1542 struct ifbaconf *bac = arg; 1543 struct bridge_rtnode *brt; 1544 struct ifbareq bareq; 1545 char *buf, *outbuf; 1546 int count, buflen, len, error = 0; 1547 1548 if (bac->ifbac_len == 0) 1549 return (0); 1550 1551 count = 0; 1552 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1553 count++; 1554 buflen = sizeof(bareq) * count; 1555 1556 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1557 if (outbuf == NULL) 1558 return (ENOMEM); 1559 1560 count = 0; 1561 buf = outbuf; 1562 len = min(bac->ifbac_len, buflen); 1563 bzero(&bareq, sizeof(bareq)); 1564 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1565 if (len < sizeof(bareq)) 1566 goto out; 1567 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1568 sizeof(bareq.ifba_ifsname)); 1569 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1570 bareq.ifba_vlan = brt->brt_vlan; 1571 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1572 time_uptime < brt->brt_expire) 1573 bareq.ifba_expire = brt->brt_expire - time_uptime; 1574 else 1575 bareq.ifba_expire = 0; 1576 bareq.ifba_flags = brt->brt_flags; 1577 1578 memcpy(buf, &bareq, sizeof(bareq)); 1579 count++; 1580 buf += sizeof(bareq); 1581 len -= sizeof(bareq); 1582 } 1583 out: 1584 bac->ifbac_len = sizeof(bareq) * count; 1585 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1586 free(outbuf, M_TEMP); 1587 return (error); 1588 } 1589 1590 static int 1591 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1592 { 1593 struct ifbareq *req = arg; 1594 struct bridge_iflist *bif; 1595 struct epoch_tracker et; 1596 int error; 1597 1598 NET_EPOCH_ENTER_ET(et); 1599 1600 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1601 if (bif == NULL) { 1602 NET_EPOCH_EXIT_ET(et); 1603 return (ENOENT); 1604 } 1605 1606 /* bridge_rtupdate() may acquire the lock. */ 1607 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1608 req->ifba_flags); 1609 NET_EPOCH_EXIT_ET(et); 1610 1611 return (error); 1612 } 1613 1614 static int 1615 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1616 { 1617 struct ifbrparam *param = arg; 1618 1619 sc->sc_brttimeout = param->ifbrp_ctime; 1620 return (0); 1621 } 1622 1623 static int 1624 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1625 { 1626 struct ifbrparam *param = arg; 1627 1628 param->ifbrp_ctime = sc->sc_brttimeout; 1629 return (0); 1630 } 1631 1632 static int 1633 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1634 { 1635 struct ifbareq *req = arg; 1636 1637 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1638 } 1639 1640 static int 1641 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1642 { 1643 struct ifbreq *req = arg; 1644 1645 BRIDGE_RT_LOCK(sc); 1646 bridge_rtflush(sc, req->ifbr_ifsflags); 1647 BRIDGE_RT_UNLOCK(sc); 1648 1649 return (0); 1650 } 1651 1652 static int 1653 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1654 { 1655 struct ifbrparam *param = arg; 1656 struct bstp_state *bs = &sc->sc_stp; 1657 1658 param->ifbrp_prio = bs->bs_bridge_priority; 1659 return (0); 1660 } 1661 1662 static int 1663 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1664 { 1665 struct ifbrparam *param = arg; 1666 1667 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1668 } 1669 1670 static int 1671 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1672 { 1673 struct ifbrparam *param = arg; 1674 struct bstp_state *bs = &sc->sc_stp; 1675 1676 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1677 return (0); 1678 } 1679 1680 static int 1681 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1682 { 1683 struct ifbrparam *param = arg; 1684 1685 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1686 } 1687 1688 static int 1689 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1690 { 1691 struct ifbrparam *param = arg; 1692 struct bstp_state *bs = &sc->sc_stp; 1693 1694 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1695 return (0); 1696 } 1697 1698 static int 1699 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1700 { 1701 struct ifbrparam *param = arg; 1702 1703 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1704 } 1705 1706 static int 1707 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1708 { 1709 struct ifbrparam *param = arg; 1710 struct bstp_state *bs = &sc->sc_stp; 1711 1712 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1713 return (0); 1714 } 1715 1716 static int 1717 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1718 { 1719 struct ifbrparam *param = arg; 1720 1721 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1722 } 1723 1724 static int 1725 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1726 { 1727 struct ifbreq *req = arg; 1728 struct bridge_iflist *bif; 1729 1730 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1731 if (bif == NULL) 1732 return (ENOENT); 1733 1734 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1735 } 1736 1737 static int 1738 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1739 { 1740 struct ifbreq *req = arg; 1741 struct bridge_iflist *bif; 1742 1743 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1744 if (bif == NULL) 1745 return (ENOENT); 1746 1747 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1748 } 1749 1750 static int 1751 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1752 { 1753 struct ifbreq *req = arg; 1754 struct bridge_iflist *bif; 1755 1756 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1757 if (bif == NULL) 1758 return (ENOENT); 1759 1760 bif->bif_addrmax = req->ifbr_addrmax; 1761 return (0); 1762 } 1763 1764 static int 1765 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1766 { 1767 struct ifbreq *req = arg; 1768 struct bridge_iflist *bif = NULL; 1769 struct ifnet *ifs; 1770 1771 ifs = ifunit(req->ifbr_ifsname); 1772 if (ifs == NULL) 1773 return (ENOENT); 1774 1775 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1776 if (ifs == bif->bif_ifp) 1777 return (EBUSY); 1778 1779 if (ifs->if_bridge != NULL) 1780 return (EBUSY); 1781 1782 switch (ifs->if_type) { 1783 case IFT_ETHER: 1784 case IFT_GIF: 1785 case IFT_L2VLAN: 1786 break; 1787 default: 1788 return (EINVAL); 1789 } 1790 1791 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1792 if (bif == NULL) 1793 return (ENOMEM); 1794 1795 bif->bif_ifp = ifs; 1796 bif->bif_flags = IFBIF_SPAN; 1797 1798 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1799 1800 return (0); 1801 } 1802 1803 static int 1804 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1805 { 1806 struct ifbreq *req = arg; 1807 struct bridge_iflist *bif; 1808 struct ifnet *ifs; 1809 1810 ifs = ifunit(req->ifbr_ifsname); 1811 if (ifs == NULL) 1812 return (ENOENT); 1813 1814 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1815 if (ifs == bif->bif_ifp) 1816 break; 1817 1818 if (bif == NULL) 1819 return (ENOENT); 1820 1821 bridge_delete_span(sc, bif); 1822 1823 return (0); 1824 } 1825 1826 static int 1827 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1828 { 1829 struct ifbropreq *req = arg; 1830 struct bstp_state *bs = &sc->sc_stp; 1831 struct bstp_port *root_port; 1832 1833 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1834 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1835 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1836 1837 root_port = bs->bs_root_port; 1838 if (root_port == NULL) 1839 req->ifbop_root_port = 0; 1840 else 1841 req->ifbop_root_port = root_port->bp_ifp->if_index; 1842 1843 req->ifbop_holdcount = bs->bs_txholdcount; 1844 req->ifbop_priority = bs->bs_bridge_priority; 1845 req->ifbop_protocol = bs->bs_protover; 1846 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1847 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1848 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1849 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1850 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1851 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1852 1853 return (0); 1854 } 1855 1856 static int 1857 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1858 { 1859 struct ifbrparam *param = arg; 1860 1861 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1862 return (0); 1863 } 1864 1865 static int 1866 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1867 { 1868 struct ifbpstpconf *bifstp = arg; 1869 struct bridge_iflist *bif; 1870 struct bstp_port *bp; 1871 struct ifbpstpreq bpreq; 1872 char *buf, *outbuf; 1873 int count, buflen, len, error = 0; 1874 1875 count = 0; 1876 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1877 if ((bif->bif_flags & IFBIF_STP) != 0) 1878 count++; 1879 } 1880 1881 buflen = sizeof(bpreq) * count; 1882 if (bifstp->ifbpstp_len == 0) { 1883 bifstp->ifbpstp_len = buflen; 1884 return (0); 1885 } 1886 1887 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1888 if (outbuf == NULL) 1889 return (ENOMEM); 1890 1891 count = 0; 1892 buf = outbuf; 1893 len = min(bifstp->ifbpstp_len, buflen); 1894 bzero(&bpreq, sizeof(bpreq)); 1895 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1896 if (len < sizeof(bpreq)) 1897 break; 1898 1899 if ((bif->bif_flags & IFBIF_STP) == 0) 1900 continue; 1901 1902 bp = &bif->bif_stp; 1903 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1904 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1905 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1906 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1907 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1908 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1909 1910 memcpy(buf, &bpreq, sizeof(bpreq)); 1911 count++; 1912 buf += sizeof(bpreq); 1913 len -= sizeof(bpreq); 1914 } 1915 1916 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1917 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1918 free(outbuf, M_TEMP); 1919 return (error); 1920 } 1921 1922 static int 1923 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1924 { 1925 struct ifbrparam *param = arg; 1926 1927 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1928 } 1929 1930 static int 1931 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1932 { 1933 struct ifbrparam *param = arg; 1934 1935 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1936 } 1937 1938 /* 1939 * bridge_ifdetach: 1940 * 1941 * Detach an interface from a bridge. Called when a member 1942 * interface is detaching. 1943 */ 1944 static void 1945 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1946 { 1947 struct bridge_softc *sc = ifp->if_bridge; 1948 struct bridge_iflist *bif; 1949 1950 if (ifp->if_flags & IFF_RENAMING) 1951 return; 1952 if (V_bridge_cloner == NULL) { 1953 /* 1954 * This detach handler can be called after 1955 * vnet_bridge_uninit(). Just return in that case. 1956 */ 1957 return; 1958 } 1959 /* Check if the interface is a bridge member */ 1960 if (sc != NULL) { 1961 BRIDGE_LOCK(sc); 1962 1963 bif = bridge_lookup_member_if(sc, ifp); 1964 if (bif != NULL) 1965 bridge_delete_member(sc, bif, 1); 1966 1967 BRIDGE_UNLOCK(sc); 1968 return; 1969 } 1970 1971 /* Check if the interface is a span port */ 1972 BRIDGE_LIST_LOCK(); 1973 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1974 BRIDGE_LOCK(sc); 1975 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1976 if (ifp == bif->bif_ifp) { 1977 bridge_delete_span(sc, bif); 1978 break; 1979 } 1980 1981 BRIDGE_UNLOCK(sc); 1982 } 1983 BRIDGE_LIST_UNLOCK(); 1984 } 1985 1986 /* 1987 * bridge_init: 1988 * 1989 * Initialize a bridge interface. 1990 */ 1991 static void 1992 bridge_init(void *xsc) 1993 { 1994 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1995 struct ifnet *ifp = sc->sc_ifp; 1996 1997 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1998 return; 1999 2000 BRIDGE_LOCK(sc); 2001 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2002 bridge_timer, sc); 2003 2004 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2005 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2006 2007 BRIDGE_UNLOCK(sc); 2008 } 2009 2010 /* 2011 * bridge_stop: 2012 * 2013 * Stop the bridge interface. 2014 */ 2015 static void 2016 bridge_stop(struct ifnet *ifp, int disable) 2017 { 2018 struct bridge_softc *sc = ifp->if_softc; 2019 2020 BRIDGE_LOCK_ASSERT(sc); 2021 2022 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2023 return; 2024 2025 BRIDGE_RT_LOCK(sc); 2026 callout_stop(&sc->sc_brcallout); 2027 2028 bstp_stop(&sc->sc_stp); 2029 2030 bridge_rtflush(sc, IFBF_FLUSHDYN); 2031 BRIDGE_RT_UNLOCK(sc); 2032 2033 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2034 } 2035 2036 /* 2037 * bridge_enqueue: 2038 * 2039 * Enqueue a packet on a bridge member interface. 2040 * 2041 */ 2042 static int 2043 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2044 { 2045 int len, err = 0; 2046 short mflags; 2047 struct mbuf *m0; 2048 2049 /* We may be sending a fragment so traverse the mbuf */ 2050 for (; m; m = m0) { 2051 m0 = m->m_nextpkt; 2052 m->m_nextpkt = NULL; 2053 len = m->m_pkthdr.len; 2054 mflags = m->m_flags; 2055 2056 /* 2057 * If underlying interface can not do VLAN tag insertion itself 2058 * then attach a packet tag that holds it. 2059 */ 2060 if ((m->m_flags & M_VLANTAG) && 2061 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2062 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2063 if (m == NULL) { 2064 if_printf(dst_ifp, 2065 "unable to prepend VLAN header\n"); 2066 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2067 continue; 2068 } 2069 m->m_flags &= ~M_VLANTAG; 2070 } 2071 2072 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2073 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2074 m_freem(m0); 2075 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 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(&V_inet_pfil_hook) 2114 #ifdef INET6 2115 || PFIL_HOOKED(&V_inet6_pfil_hook) 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 epoch_tracker et; 2142 struct ether_header *eh; 2143 struct ifnet *dst_if; 2144 struct bridge_softc *sc; 2145 uint16_t vlan; 2146 2147 NET_EPOCH_ENTER_ET(et); 2148 2149 if (m->m_len < ETHER_HDR_LEN) { 2150 m = m_pullup(m, ETHER_HDR_LEN); 2151 if (m == NULL) { 2152 NET_EPOCH_EXIT_ET(et); 2153 return (0); 2154 } 2155 } 2156 2157 eh = mtod(m, struct ether_header *); 2158 sc = ifp->if_bridge; 2159 vlan = VLANTAGOF(m); 2160 2161 /* 2162 * If bridge is down, but the original output interface is up, 2163 * go ahead and send out that interface. Otherwise, the packet 2164 * is dropped below. 2165 */ 2166 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2167 dst_if = ifp; 2168 goto sendunicast; 2169 } 2170 2171 /* 2172 * If the packet is a multicast, or we don't know a better way to 2173 * get there, send to all interfaces. 2174 */ 2175 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2176 dst_if = NULL; 2177 else 2178 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2179 if (dst_if == NULL) { 2180 struct bridge_iflist *bif; 2181 struct mbuf *mc; 2182 int used = 0; 2183 2184 bridge_span(sc, m); 2185 2186 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2187 dst_if = bif->bif_ifp; 2188 2189 if (dst_if->if_type == IFT_GIF) 2190 continue; 2191 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2192 continue; 2193 2194 /* 2195 * If this is not the original output interface, 2196 * and the interface is participating in spanning 2197 * tree, make sure the port is in a state that 2198 * allows forwarding. 2199 */ 2200 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2201 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2202 continue; 2203 2204 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2205 used = 1; 2206 mc = m; 2207 } else { 2208 mc = m_dup(m, M_NOWAIT); 2209 if (mc == NULL) { 2210 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2211 continue; 2212 } 2213 } 2214 2215 bridge_enqueue(sc, dst_if, mc); 2216 } 2217 if (used == 0) 2218 m_freem(m); 2219 NET_EPOCH_EXIT_ET(et); 2220 return (0); 2221 } 2222 2223 sendunicast: 2224 /* 2225 * XXX Spanning tree consideration here? 2226 */ 2227 2228 bridge_span(sc, m); 2229 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2230 m_freem(m); 2231 NET_EPOCH_EXIT_ET(et); 2232 return (0); 2233 } 2234 2235 bridge_enqueue(sc, dst_if, m); 2236 NET_EPOCH_EXIT_ET(et); 2237 return (0); 2238 } 2239 2240 /* 2241 * bridge_transmit: 2242 * 2243 * Do output on a bridge. 2244 * 2245 */ 2246 static int 2247 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2248 { 2249 struct epoch_tracker et; 2250 struct bridge_softc *sc; 2251 struct ether_header *eh; 2252 struct ifnet *dst_if; 2253 int error = 0; 2254 2255 NET_EPOCH_ENTER_ET(et); 2256 2257 sc = ifp->if_softc; 2258 2259 ETHER_BPF_MTAP(ifp, m); 2260 2261 eh = mtod(m, struct ether_header *); 2262 2263 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2264 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2265 error = bridge_enqueue(sc, dst_if, m); 2266 } else 2267 bridge_broadcast(sc, ifp, m, 0); 2268 2269 NET_EPOCH_EXIT_ET(et); 2270 2271 return (error); 2272 } 2273 2274 #ifdef ALTQ 2275 static void 2276 bridge_altq_start(if_t ifp) 2277 { 2278 struct ifaltq *ifq = &ifp->if_snd; 2279 struct mbuf *m; 2280 2281 IFQ_LOCK(ifq); 2282 IFQ_DEQUEUE_NOLOCK(ifq, m); 2283 while (m != NULL) { 2284 bridge_transmit(ifp, m); 2285 IFQ_DEQUEUE_NOLOCK(ifq, m); 2286 } 2287 IFQ_UNLOCK(ifq); 2288 } 2289 2290 static int 2291 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2292 { 2293 int err; 2294 2295 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2296 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2297 if (err == 0) 2298 bridge_altq_start(ifp); 2299 } else 2300 err = bridge_transmit(ifp, m); 2301 2302 return (err); 2303 } 2304 #endif /* ALTQ */ 2305 2306 /* 2307 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2308 */ 2309 static void 2310 bridge_qflush(struct ifnet *ifp __unused) 2311 { 2312 } 2313 2314 /* 2315 * bridge_forward: 2316 * 2317 * The forwarding function of the bridge. 2318 * 2319 * NOTE: Releases the lock on return. 2320 */ 2321 static void 2322 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2323 struct mbuf *m) 2324 { 2325 struct bridge_iflist *dbif; 2326 struct ifnet *src_if, *dst_if, *ifp; 2327 struct ether_header *eh; 2328 uint16_t vlan; 2329 uint8_t *dst; 2330 int error; 2331 2332 MPASS(in_epoch(net_epoch_preempt)); 2333 2334 src_if = m->m_pkthdr.rcvif; 2335 ifp = sc->sc_ifp; 2336 2337 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2338 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2339 vlan = VLANTAGOF(m); 2340 2341 if ((sbif->bif_flags & IFBIF_STP) && 2342 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2343 goto drop; 2344 2345 eh = mtod(m, struct ether_header *); 2346 dst = eh->ether_dhost; 2347 2348 /* If the interface is learning, record the address. */ 2349 if (sbif->bif_flags & IFBIF_LEARNING) { 2350 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2351 sbif, 0, IFBAF_DYNAMIC); 2352 /* 2353 * If the interface has addresses limits then deny any source 2354 * that is not in the cache. 2355 */ 2356 if (error && sbif->bif_addrmax) 2357 goto drop; 2358 } 2359 2360 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2361 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2362 goto drop; 2363 2364 /* 2365 * At this point, the port either doesn't participate 2366 * in spanning tree or it is in the forwarding state. 2367 */ 2368 2369 /* 2370 * If the packet is unicast, destined for someone on 2371 * "this" side of the bridge, drop it. 2372 */ 2373 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2374 dst_if = bridge_rtlookup(sc, dst, vlan); 2375 if (src_if == dst_if) 2376 goto drop; 2377 } else { 2378 /* 2379 * Check if its a reserved multicast address, any address 2380 * listed in 802.1D section 7.12.6 may not be forwarded by the 2381 * bridge. 2382 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2383 */ 2384 if (dst[0] == 0x01 && dst[1] == 0x80 && 2385 dst[2] == 0xc2 && dst[3] == 0x00 && 2386 dst[4] == 0x00 && dst[5] <= 0x0f) 2387 goto drop; 2388 2389 /* ...forward it to all interfaces. */ 2390 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2391 dst_if = NULL; 2392 } 2393 2394 /* 2395 * If we have a destination interface which is a member of our bridge, 2396 * OR this is a unicast packet, push it through the bpf(4) machinery. 2397 * For broadcast or multicast packets, don't bother because it will 2398 * be reinjected into ether_input. We do this before we pass the packets 2399 * through the pfil(9) framework, as it is possible that pfil(9) will 2400 * drop the packet, or possibly modify it, making it difficult to debug 2401 * firewall issues on the bridge. 2402 */ 2403 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2404 ETHER_BPF_MTAP(ifp, m); 2405 2406 /* run the packet filter */ 2407 if (PFIL_HOOKED(&V_inet_pfil_hook) 2408 #ifdef INET6 2409 || PFIL_HOOKED(&V_inet6_pfil_hook) 2410 #endif 2411 ) { 2412 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2413 return; 2414 if (m == NULL) 2415 return; 2416 } 2417 2418 if (dst_if == NULL) { 2419 bridge_broadcast(sc, src_if, m, 1); 2420 return; 2421 } 2422 2423 /* 2424 * At this point, we're dealing with a unicast frame 2425 * going to a different interface. 2426 */ 2427 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2428 goto drop; 2429 2430 dbif = bridge_lookup_member_if(sc, dst_if); 2431 if (dbif == NULL) 2432 /* Not a member of the bridge (anymore?) */ 2433 goto drop; 2434 2435 /* Private segments can not talk to each other */ 2436 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2437 goto drop; 2438 2439 if ((dbif->bif_flags & IFBIF_STP) && 2440 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2441 goto drop; 2442 2443 if (PFIL_HOOKED(&V_inet_pfil_hook) 2444 #ifdef INET6 2445 || PFIL_HOOKED(&V_inet6_pfil_hook) 2446 #endif 2447 ) { 2448 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2449 return; 2450 if (m == NULL) 2451 return; 2452 } 2453 2454 bridge_enqueue(sc, dst_if, m); 2455 return; 2456 2457 drop: 2458 m_freem(m); 2459 } 2460 2461 /* 2462 * bridge_input: 2463 * 2464 * Receive input from a member interface. Queue the packet for 2465 * bridging if it is not for us. 2466 */ 2467 static struct mbuf * 2468 bridge_input(struct ifnet *ifp, struct mbuf *m) 2469 { 2470 struct epoch_tracker et; 2471 struct bridge_softc *sc = ifp->if_bridge; 2472 struct bridge_iflist *bif, *bif2; 2473 struct ifnet *bifp; 2474 struct ether_header *eh; 2475 struct mbuf *mc, *mc2; 2476 uint16_t vlan; 2477 int error; 2478 2479 NET_EPOCH_ENTER_ET(et); 2480 2481 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2482 NET_EPOCH_EXIT_ET(et); 2483 return (m); 2484 } 2485 2486 bifp = sc->sc_ifp; 2487 vlan = VLANTAGOF(m); 2488 2489 /* 2490 * Implement support for bridge monitoring. If this flag has been 2491 * set on this interface, discard the packet once we push it through 2492 * the bpf(4) machinery, but before we do, increment the byte and 2493 * packet counters associated with this interface. 2494 */ 2495 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2496 m->m_pkthdr.rcvif = bifp; 2497 ETHER_BPF_MTAP(bifp, m); 2498 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2499 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2500 m_freem(m); 2501 NET_EPOCH_EXIT_ET(et); 2502 return (NULL); 2503 } 2504 bif = bridge_lookup_member_if(sc, ifp); 2505 if (bif == NULL) { 2506 NET_EPOCH_EXIT_ET(et); 2507 return (m); 2508 } 2509 2510 eh = mtod(m, struct ether_header *); 2511 2512 bridge_span(sc, m); 2513 2514 if (m->m_flags & (M_BCAST|M_MCAST)) { 2515 /* Tap off 802.1D packets; they do not get forwarded. */ 2516 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2517 ETHER_ADDR_LEN) == 0) { 2518 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2519 NET_EPOCH_EXIT_ET(et); 2520 return (NULL); 2521 } 2522 2523 if ((bif->bif_flags & IFBIF_STP) && 2524 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2525 NET_EPOCH_EXIT_ET(et); 2526 return (m); 2527 } 2528 2529 /* 2530 * Make a deep copy of the packet and enqueue the copy 2531 * for bridge processing; return the original packet for 2532 * local processing. 2533 */ 2534 mc = m_dup(m, M_NOWAIT); 2535 if (mc == NULL) { 2536 NET_EPOCH_EXIT_ET(et); 2537 return (m); 2538 } 2539 2540 /* Perform the bridge forwarding function with the copy. */ 2541 bridge_forward(sc, bif, mc); 2542 2543 /* 2544 * Reinject the mbuf as arriving on the bridge so we have a 2545 * chance at claiming multicast packets. We can not loop back 2546 * here from ether_input as a bridge is never a member of a 2547 * bridge. 2548 */ 2549 KASSERT(bifp->if_bridge == NULL, 2550 ("loop created in bridge_input")); 2551 mc2 = m_dup(m, M_NOWAIT); 2552 if (mc2 != NULL) { 2553 /* Keep the layer3 header aligned */ 2554 int i = min(mc2->m_pkthdr.len, max_protohdr); 2555 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2556 } 2557 if (mc2 != NULL) { 2558 mc2->m_pkthdr.rcvif = bifp; 2559 (*bifp->if_input)(bifp, mc2); 2560 } 2561 2562 /* Return the original packet for local processing. */ 2563 NET_EPOCH_EXIT_ET(et); 2564 return (m); 2565 } 2566 2567 if ((bif->bif_flags & IFBIF_STP) && 2568 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2569 NET_EPOCH_EXIT_ET(et); 2570 return (m); 2571 } 2572 2573 #if (defined(INET) || defined(INET6)) 2574 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2575 || ((iface)->if_carp \ 2576 && (*carp_forus_p)((iface), eh->ether_dhost)) 2577 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2578 || ((iface)->if_carp \ 2579 && (*carp_forus_p)((iface), eh->ether_shost)) 2580 #else 2581 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2582 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2583 #endif 2584 2585 #ifdef INET6 2586 # define OR_PFIL_HOOKED_INET6 \ 2587 || PFIL_HOOKED(&V_inet6_pfil_hook) 2588 #else 2589 # define OR_PFIL_HOOKED_INET6 2590 #endif 2591 2592 #define GRAB_OUR_PACKETS(iface) \ 2593 if ((iface)->if_type == IFT_GIF) \ 2594 continue; \ 2595 /* It is destined for us. */ \ 2596 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2597 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2598 ) { \ 2599 if ((iface)->if_type == IFT_BRIDGE) { \ 2600 ETHER_BPF_MTAP(iface, m); \ 2601 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \ 2602 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2603 /* Filter on the physical interface. */ \ 2604 if (V_pfil_local_phys && \ 2605 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2606 OR_PFIL_HOOKED_INET6)) { \ 2607 if (bridge_pfil(&m, NULL, ifp, \ 2608 PFIL_IN) != 0 || m == NULL) { \ 2609 NET_EPOCH_EXIT_ET(et); \ 2610 return (NULL); \ 2611 } \ 2612 eh = mtod(m, struct ether_header *); \ 2613 } \ 2614 } \ 2615 if (bif->bif_flags & IFBIF_LEARNING) { \ 2616 error = bridge_rtupdate(sc, eh->ether_shost, \ 2617 vlan, bif, 0, IFBAF_DYNAMIC); \ 2618 if (error && bif->bif_addrmax) { \ 2619 m_freem(m); \ 2620 NET_EPOCH_EXIT_ET(et); \ 2621 return (NULL); \ 2622 } \ 2623 } \ 2624 m->m_pkthdr.rcvif = iface; \ 2625 NET_EPOCH_EXIT_ET(et); \ 2626 return (m); \ 2627 } \ 2628 \ 2629 /* We just received a packet that we sent out. */ \ 2630 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2631 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2632 ) { \ 2633 m_freem(m); \ 2634 NET_EPOCH_EXIT_ET(et); \ 2635 return (NULL); \ 2636 } 2637 2638 /* 2639 * Unicast. Make sure it's not for the bridge. 2640 */ 2641 do { GRAB_OUR_PACKETS(bifp) } while (0); 2642 2643 /* 2644 * Give a chance for ifp at first priority. This will help when the 2645 * packet comes through the interface like VLAN's with the same MACs 2646 * on several interfaces from the same bridge. This also will save 2647 * some CPU cycles in case the destination interface and the input 2648 * interface (eq ifp) are the same. 2649 */ 2650 do { GRAB_OUR_PACKETS(ifp) } while (0); 2651 2652 /* Now check the all bridge members. */ 2653 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2654 GRAB_OUR_PACKETS(bif2->bif_ifp) 2655 } 2656 2657 #undef OR_CARP_CHECK_WE_ARE_DST 2658 #undef OR_CARP_CHECK_WE_ARE_SRC 2659 #undef OR_PFIL_HOOKED_INET6 2660 #undef GRAB_OUR_PACKETS 2661 2662 /* Perform the bridge forwarding function. */ 2663 bridge_forward(sc, bif, m); 2664 2665 NET_EPOCH_EXIT_ET(et); 2666 return (NULL); 2667 } 2668 2669 /* 2670 * bridge_broadcast: 2671 * 2672 * Send a frame to all interfaces that are members of 2673 * the bridge, except for the one on which the packet 2674 * arrived. 2675 * 2676 * NOTE: Releases the lock on return. 2677 */ 2678 static void 2679 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2680 struct mbuf *m, int runfilt) 2681 { 2682 struct bridge_iflist *dbif, *sbif; 2683 struct mbuf *mc; 2684 struct ifnet *dst_if; 2685 int used = 0, i; 2686 2687 MPASS(in_epoch(net_epoch_preempt)); 2688 2689 sbif = bridge_lookup_member_if(sc, src_if); 2690 2691 /* Filter on the bridge interface before broadcasting */ 2692 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2693 #ifdef INET6 2694 || PFIL_HOOKED(&V_inet6_pfil_hook) 2695 #endif 2696 )) { 2697 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2698 return; 2699 if (m == NULL) 2700 return; 2701 } 2702 2703 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2704 dst_if = dbif->bif_ifp; 2705 if (dst_if == src_if) 2706 continue; 2707 2708 /* Private segments can not talk to each other */ 2709 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2710 continue; 2711 2712 if ((dbif->bif_flags & IFBIF_STP) && 2713 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2714 continue; 2715 2716 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2717 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2718 continue; 2719 2720 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2721 continue; 2722 2723 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2724 mc = m; 2725 used = 1; 2726 } else { 2727 mc = m_dup(m, M_NOWAIT); 2728 if (mc == NULL) { 2729 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2730 continue; 2731 } 2732 } 2733 2734 /* 2735 * Filter on the output interface. Pass a NULL bridge interface 2736 * pointer so we do not redundantly filter on the bridge for 2737 * each interface we broadcast on. 2738 */ 2739 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2740 #ifdef INET6 2741 || PFIL_HOOKED(&V_inet6_pfil_hook) 2742 #endif 2743 )) { 2744 if (used == 0) { 2745 /* Keep the layer3 header aligned */ 2746 i = min(mc->m_pkthdr.len, max_protohdr); 2747 mc = m_copyup(mc, i, ETHER_ALIGN); 2748 if (mc == NULL) { 2749 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2750 continue; 2751 } 2752 } 2753 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2754 continue; 2755 if (mc == NULL) 2756 continue; 2757 } 2758 2759 bridge_enqueue(sc, dst_if, mc); 2760 } 2761 if (used == 0) 2762 m_freem(m); 2763 } 2764 2765 /* 2766 * bridge_span: 2767 * 2768 * Duplicate a packet out one or more interfaces that are in span mode, 2769 * the original mbuf is unmodified. 2770 */ 2771 static void 2772 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2773 { 2774 struct bridge_iflist *bif; 2775 struct ifnet *dst_if; 2776 struct mbuf *mc; 2777 2778 MPASS(in_epoch(net_epoch_preempt)); 2779 2780 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2781 return; 2782 2783 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2784 dst_if = bif->bif_ifp; 2785 2786 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2787 continue; 2788 2789 mc = m_dup(m, M_NOWAIT); 2790 if (mc == NULL) { 2791 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2792 continue; 2793 } 2794 2795 bridge_enqueue(sc, dst_if, mc); 2796 } 2797 } 2798 2799 /* 2800 * bridge_rtupdate: 2801 * 2802 * Add a bridge routing entry. 2803 */ 2804 static int 2805 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2806 struct bridge_iflist *bif, int setflags, uint8_t flags) 2807 { 2808 struct bridge_rtnode *brt; 2809 int error; 2810 2811 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2812 2813 /* Check the source address is valid and not multicast. */ 2814 if (ETHER_IS_MULTICAST(dst) || 2815 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2816 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2817 return (EINVAL); 2818 2819 /* 802.1p frames map to vlan 1 */ 2820 if (vlan == 0) 2821 vlan = 1; 2822 2823 /* 2824 * A route for this destination might already exist. If so, 2825 * update it, otherwise create a new one. 2826 */ 2827 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2828 BRIDGE_RT_LOCK(sc); 2829 2830 /* Check again, now that we have the lock. There could have 2831 * been a race and we only want to insert this once. */ 2832 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) { 2833 BRIDGE_RT_UNLOCK(sc); 2834 return (0); 2835 } 2836 2837 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2838 sc->sc_brtexceeded++; 2839 BRIDGE_RT_UNLOCK(sc); 2840 return (ENOSPC); 2841 } 2842 /* Check per interface address limits (if enabled) */ 2843 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2844 bif->bif_addrexceeded++; 2845 BRIDGE_RT_UNLOCK(sc); 2846 return (ENOSPC); 2847 } 2848 2849 /* 2850 * Allocate a new bridge forwarding node, and 2851 * initialize the expiration time and Ethernet 2852 * address. 2853 */ 2854 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2855 if (brt == NULL) { 2856 BRIDGE_RT_UNLOCK(sc); 2857 return (ENOMEM); 2858 } 2859 brt->brt_vnet = curvnet; 2860 2861 if (bif->bif_flags & IFBIF_STICKY) 2862 brt->brt_flags = IFBAF_STICKY; 2863 else 2864 brt->brt_flags = IFBAF_DYNAMIC; 2865 2866 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2867 brt->brt_vlan = vlan; 2868 2869 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2870 uma_zfree(V_bridge_rtnode_zone, brt); 2871 BRIDGE_RT_UNLOCK(sc); 2872 return (error); 2873 } 2874 brt->brt_dst = bif; 2875 bif->bif_addrcnt++; 2876 2877 BRIDGE_RT_UNLOCK(sc); 2878 } 2879 2880 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2881 brt->brt_dst != bif) { 2882 BRIDGE_RT_LOCK(sc); 2883 brt->brt_dst->bif_addrcnt--; 2884 brt->brt_dst = bif; 2885 brt->brt_dst->bif_addrcnt++; 2886 BRIDGE_RT_UNLOCK(sc); 2887 } 2888 2889 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2890 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2891 if (setflags) 2892 brt->brt_flags = flags; 2893 2894 return (0); 2895 } 2896 2897 /* 2898 * bridge_rtlookup: 2899 * 2900 * Lookup the destination interface for an address. 2901 */ 2902 static struct ifnet * 2903 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2904 { 2905 struct bridge_rtnode *brt; 2906 2907 MPASS(in_epoch(net_epoch_preempt)); 2908 2909 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2910 return (NULL); 2911 2912 return (brt->brt_ifp); 2913 } 2914 2915 /* 2916 * bridge_rttrim: 2917 * 2918 * Trim the routine table so that we have a number 2919 * of routing entries less than or equal to the 2920 * maximum number. 2921 */ 2922 static void 2923 bridge_rttrim(struct bridge_softc *sc) 2924 { 2925 struct bridge_rtnode *brt, *nbrt; 2926 2927 MPASS(in_epoch(net_epoch_preempt)); 2928 BRIDGE_RT_LOCK_ASSERT(sc); 2929 2930 /* Make sure we actually need to do this. */ 2931 if (sc->sc_brtcnt <= sc->sc_brtmax) 2932 return; 2933 2934 /* Force an aging cycle; this might trim enough addresses. */ 2935 bridge_rtage(sc); 2936 if (sc->sc_brtcnt <= sc->sc_brtmax) 2937 return; 2938 2939 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2940 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2941 bridge_rtnode_destroy(sc, brt); 2942 if (sc->sc_brtcnt <= sc->sc_brtmax) 2943 return; 2944 } 2945 } 2946 } 2947 2948 /* 2949 * bridge_timer: 2950 * 2951 * Aging timer for the bridge. 2952 */ 2953 static void 2954 bridge_timer(void *arg) 2955 { 2956 struct bridge_softc *sc = arg; 2957 2958 BRIDGE_RT_LOCK_ASSERT(sc); 2959 2960 /* Destruction of rtnodes requires a proper vnet context */ 2961 CURVNET_SET(sc->sc_ifp->if_vnet); 2962 bridge_rtage(sc); 2963 2964 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2965 callout_reset(&sc->sc_brcallout, 2966 bridge_rtable_prune_period * hz, bridge_timer, sc); 2967 CURVNET_RESTORE(); 2968 } 2969 2970 /* 2971 * bridge_rtage: 2972 * 2973 * Perform an aging cycle. 2974 */ 2975 static void 2976 bridge_rtage(struct bridge_softc *sc) 2977 { 2978 struct bridge_rtnode *brt, *nbrt; 2979 2980 BRIDGE_RT_LOCK_ASSERT(sc); 2981 2982 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2983 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2984 if (time_uptime >= brt->brt_expire) 2985 bridge_rtnode_destroy(sc, brt); 2986 } 2987 } 2988 } 2989 2990 /* 2991 * bridge_rtflush: 2992 * 2993 * Remove all dynamic addresses from the bridge. 2994 */ 2995 static void 2996 bridge_rtflush(struct bridge_softc *sc, int full) 2997 { 2998 struct bridge_rtnode *brt, *nbrt; 2999 3000 BRIDGE_RT_LOCK_ASSERT(sc); 3001 3002 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3003 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3004 bridge_rtnode_destroy(sc, brt); 3005 } 3006 } 3007 3008 /* 3009 * bridge_rtdaddr: 3010 * 3011 * Remove an address from the table. 3012 */ 3013 static int 3014 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3015 { 3016 struct bridge_rtnode *brt; 3017 int found = 0; 3018 3019 BRIDGE_RT_LOCK(sc); 3020 3021 /* 3022 * If vlan is zero then we want to delete for all vlans so the lookup 3023 * may return more than one. 3024 */ 3025 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3026 bridge_rtnode_destroy(sc, brt); 3027 found = 1; 3028 } 3029 3030 BRIDGE_RT_UNLOCK(sc); 3031 3032 return (found ? 0 : ENOENT); 3033 } 3034 3035 /* 3036 * bridge_rtdelete: 3037 * 3038 * Delete routes to a speicifc member interface. 3039 */ 3040 static void 3041 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3042 { 3043 struct bridge_rtnode *brt, *nbrt; 3044 3045 BRIDGE_RT_LOCK_ASSERT(sc); 3046 3047 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3048 if (brt->brt_ifp == ifp && (full || 3049 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3050 bridge_rtnode_destroy(sc, brt); 3051 } 3052 } 3053 3054 /* 3055 * bridge_rtable_init: 3056 * 3057 * Initialize the route table for this bridge. 3058 */ 3059 static void 3060 bridge_rtable_init(struct bridge_softc *sc) 3061 { 3062 int i; 3063 3064 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3065 M_DEVBUF, M_WAITOK); 3066 3067 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3068 CK_LIST_INIT(&sc->sc_rthash[i]); 3069 3070 sc->sc_rthash_key = arc4random(); 3071 CK_LIST_INIT(&sc->sc_rtlist); 3072 } 3073 3074 /* 3075 * bridge_rtable_fini: 3076 * 3077 * Deconstruct the route table for this bridge. 3078 */ 3079 static void 3080 bridge_rtable_fini(struct bridge_softc *sc) 3081 { 3082 3083 KASSERT(sc->sc_brtcnt == 0, 3084 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3085 free(sc->sc_rthash, M_DEVBUF); 3086 } 3087 3088 /* 3089 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3090 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3091 */ 3092 #define mix(a, b, c) \ 3093 do { \ 3094 a -= b; a -= c; a ^= (c >> 13); \ 3095 b -= c; b -= a; b ^= (a << 8); \ 3096 c -= a; c -= b; c ^= (b >> 13); \ 3097 a -= b; a -= c; a ^= (c >> 12); \ 3098 b -= c; b -= a; b ^= (a << 16); \ 3099 c -= a; c -= b; c ^= (b >> 5); \ 3100 a -= b; a -= c; a ^= (c >> 3); \ 3101 b -= c; b -= a; b ^= (a << 10); \ 3102 c -= a; c -= b; c ^= (b >> 15); \ 3103 } while (/*CONSTCOND*/0) 3104 3105 static __inline uint32_t 3106 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3107 { 3108 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3109 3110 b += addr[5] << 8; 3111 b += addr[4]; 3112 a += addr[3] << 24; 3113 a += addr[2] << 16; 3114 a += addr[1] << 8; 3115 a += addr[0]; 3116 3117 mix(a, b, c); 3118 3119 return (c & BRIDGE_RTHASH_MASK); 3120 } 3121 3122 #undef mix 3123 3124 static int 3125 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3126 { 3127 int i, d; 3128 3129 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3130 d = ((int)a[i]) - ((int)b[i]); 3131 } 3132 3133 return (d); 3134 } 3135 3136 /* 3137 * bridge_rtnode_lookup: 3138 * 3139 * Look up a bridge route node for the specified destination. Compare the 3140 * vlan id or if zero then just return the first match. 3141 */ 3142 static struct bridge_rtnode * 3143 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3144 { 3145 struct bridge_rtnode *brt; 3146 uint32_t hash; 3147 int dir; 3148 3149 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3150 3151 hash = bridge_rthash(sc, addr); 3152 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3153 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3154 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3155 return (brt); 3156 if (dir > 0) 3157 return (NULL); 3158 } 3159 3160 return (NULL); 3161 } 3162 3163 /* 3164 * bridge_rtnode_insert: 3165 * 3166 * Insert the specified bridge node into the route table. We 3167 * assume the entry is not already in the table. 3168 */ 3169 static int 3170 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3171 { 3172 struct bridge_rtnode *lbrt; 3173 uint32_t hash; 3174 int dir; 3175 3176 BRIDGE_RT_LOCK_ASSERT(sc); 3177 3178 hash = bridge_rthash(sc, brt->brt_addr); 3179 3180 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3181 if (lbrt == NULL) { 3182 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3183 goto out; 3184 } 3185 3186 do { 3187 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3188 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3189 return (EEXIST); 3190 if (dir > 0) { 3191 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3192 goto out; 3193 } 3194 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3195 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3196 goto out; 3197 } 3198 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3199 } while (lbrt != NULL); 3200 3201 #ifdef DIAGNOSTIC 3202 panic("bridge_rtnode_insert: impossible"); 3203 #endif 3204 3205 out: 3206 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3207 sc->sc_brtcnt++; 3208 3209 return (0); 3210 } 3211 3212 static void 3213 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3214 { 3215 struct bridge_rtnode *brt; 3216 3217 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3218 3219 CURVNET_SET(brt->brt_vnet); 3220 uma_zfree(V_bridge_rtnode_zone, brt); 3221 CURVNET_RESTORE(); 3222 } 3223 3224 /* 3225 * bridge_rtnode_destroy: 3226 * 3227 * Destroy a bridge rtnode. 3228 */ 3229 static void 3230 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3231 { 3232 3233 BRIDGE_RT_LOCK_ASSERT(sc); 3234 3235 CK_LIST_REMOVE(brt, brt_hash); 3236 3237 CK_LIST_REMOVE(brt, brt_list); 3238 sc->sc_brtcnt--; 3239 brt->brt_dst->bif_addrcnt--; 3240 3241 epoch_call(net_epoch_preempt, &brt->brt_epoch_ctx, 3242 bridge_rtnode_destroy_cb); 3243 } 3244 3245 /* 3246 * bridge_rtable_expire: 3247 * 3248 * Set the expiry time for all routes on an interface. 3249 */ 3250 static void 3251 bridge_rtable_expire(struct ifnet *ifp, int age) 3252 { 3253 struct bridge_softc *sc = ifp->if_bridge; 3254 struct bridge_rtnode *brt; 3255 3256 CURVNET_SET(ifp->if_vnet); 3257 BRIDGE_RT_LOCK(sc); 3258 3259 /* 3260 * If the age is zero then flush, otherwise set all the expiry times to 3261 * age for the interface 3262 */ 3263 if (age == 0) 3264 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3265 else { 3266 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3267 /* Cap the expiry time to 'age' */ 3268 if (brt->brt_ifp == ifp && 3269 brt->brt_expire > time_uptime + age && 3270 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3271 brt->brt_expire = time_uptime + age; 3272 } 3273 } 3274 BRIDGE_RT_UNLOCK(sc); 3275 CURVNET_RESTORE(); 3276 } 3277 3278 /* 3279 * bridge_state_change: 3280 * 3281 * Callback from the bridgestp code when a port changes states. 3282 */ 3283 static void 3284 bridge_state_change(struct ifnet *ifp, int state) 3285 { 3286 struct bridge_softc *sc = ifp->if_bridge; 3287 static const char *stpstates[] = { 3288 "disabled", 3289 "listening", 3290 "learning", 3291 "forwarding", 3292 "blocking", 3293 "discarding" 3294 }; 3295 3296 CURVNET_SET(ifp->if_vnet); 3297 if (V_log_stp) 3298 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3299 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3300 CURVNET_RESTORE(); 3301 } 3302 3303 /* 3304 * Send bridge packets through pfil if they are one of the types pfil can deal 3305 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3306 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3307 * that interface. 3308 */ 3309 static int 3310 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3311 { 3312 int snap, error, i, hlen; 3313 struct ether_header *eh1, eh2; 3314 struct ip *ip; 3315 struct llc llc1; 3316 u_int16_t ether_type; 3317 3318 snap = 0; 3319 error = -1; /* Default error if not error == 0 */ 3320 3321 #if 0 3322 /* we may return with the IP fields swapped, ensure its not shared */ 3323 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3324 #endif 3325 3326 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3327 return (0); /* filtering is disabled */ 3328 3329 i = min((*mp)->m_pkthdr.len, max_protohdr); 3330 if ((*mp)->m_len < i) { 3331 *mp = m_pullup(*mp, i); 3332 if (*mp == NULL) { 3333 printf("%s: m_pullup failed\n", __func__); 3334 return (-1); 3335 } 3336 } 3337 3338 eh1 = mtod(*mp, struct ether_header *); 3339 ether_type = ntohs(eh1->ether_type); 3340 3341 /* 3342 * Check for SNAP/LLC. 3343 */ 3344 if (ether_type < ETHERMTU) { 3345 struct llc *llc2 = (struct llc *)(eh1 + 1); 3346 3347 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3348 llc2->llc_dsap == LLC_SNAP_LSAP && 3349 llc2->llc_ssap == LLC_SNAP_LSAP && 3350 llc2->llc_control == LLC_UI) { 3351 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3352 snap = 1; 3353 } 3354 } 3355 3356 /* 3357 * If we're trying to filter bridge traffic, don't look at anything 3358 * other than IP and ARP traffic. If the filter doesn't understand 3359 * IPv6, don't allow IPv6 through the bridge either. This is lame 3360 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3361 * but of course we don't have an AppleTalk filter to begin with. 3362 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3363 * ARP traffic.) 3364 */ 3365 switch (ether_type) { 3366 case ETHERTYPE_ARP: 3367 case ETHERTYPE_REVARP: 3368 if (V_pfil_ipfw_arp == 0) 3369 return (0); /* Automatically pass */ 3370 break; 3371 3372 case ETHERTYPE_IP: 3373 #ifdef INET6 3374 case ETHERTYPE_IPV6: 3375 #endif /* INET6 */ 3376 break; 3377 default: 3378 /* 3379 * Check to see if the user wants to pass non-ip 3380 * packets, these will not be checked by pfil(9) and 3381 * passed unconditionally so the default is to drop. 3382 */ 3383 if (V_pfil_onlyip) 3384 goto bad; 3385 } 3386 3387 /* Run the packet through pfil before stripping link headers */ 3388 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 && 3389 dir == PFIL_OUT && ifp != NULL) { 3390 3391 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, 0, 3392 NULL); 3393 3394 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3395 return (error); 3396 } 3397 3398 /* Strip off the Ethernet header and keep a copy. */ 3399 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3400 m_adj(*mp, ETHER_HDR_LEN); 3401 3402 /* Strip off snap header, if present */ 3403 if (snap) { 3404 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3405 m_adj(*mp, sizeof(struct llc)); 3406 } 3407 3408 /* 3409 * Check the IP header for alignment and errors 3410 */ 3411 if (dir == PFIL_IN) { 3412 switch (ether_type) { 3413 case ETHERTYPE_IP: 3414 error = bridge_ip_checkbasic(mp); 3415 break; 3416 #ifdef INET6 3417 case ETHERTYPE_IPV6: 3418 error = bridge_ip6_checkbasic(mp); 3419 break; 3420 #endif /* INET6 */ 3421 default: 3422 error = 0; 3423 } 3424 if (error) 3425 goto bad; 3426 } 3427 3428 error = 0; 3429 3430 /* 3431 * Run the packet through pfil 3432 */ 3433 switch (ether_type) { 3434 case ETHERTYPE_IP: 3435 /* 3436 * Run pfil on the member interface and the bridge, both can 3437 * be skipped by clearing pfil_member or pfil_bridge. 3438 * 3439 * Keep the order: 3440 * in_if -> bridge_if -> out_if 3441 */ 3442 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3443 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3444 dir, 0, NULL); 3445 3446 if (*mp == NULL || error != 0) /* filter may consume */ 3447 break; 3448 3449 if (V_pfil_member && ifp != NULL) 3450 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3451 dir, 0, NULL); 3452 3453 if (*mp == NULL || error != 0) /* filter may consume */ 3454 break; 3455 3456 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3457 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3458 dir, 0, NULL); 3459 3460 if (*mp == NULL || error != 0) /* filter may consume */ 3461 break; 3462 3463 /* check if we need to fragment the packet */ 3464 /* bridge_fragment generates a mbuf chain of packets */ 3465 /* that already include eth headers */ 3466 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3467 i = (*mp)->m_pkthdr.len; 3468 if (i > ifp->if_mtu) { 3469 error = bridge_fragment(ifp, mp, &eh2, snap, 3470 &llc1); 3471 return (error); 3472 } 3473 } 3474 3475 /* Recalculate the ip checksum. */ 3476 ip = mtod(*mp, struct ip *); 3477 hlen = ip->ip_hl << 2; 3478 if (hlen < sizeof(struct ip)) 3479 goto bad; 3480 if (hlen > (*mp)->m_len) { 3481 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3482 goto bad; 3483 ip = mtod(*mp, struct ip *); 3484 if (ip == NULL) 3485 goto bad; 3486 } 3487 ip->ip_sum = 0; 3488 if (hlen == sizeof(struct ip)) 3489 ip->ip_sum = in_cksum_hdr(ip); 3490 else 3491 ip->ip_sum = in_cksum(*mp, hlen); 3492 3493 break; 3494 #ifdef INET6 3495 case ETHERTYPE_IPV6: 3496 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3497 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3498 dir, 0, NULL); 3499 3500 if (*mp == NULL || error != 0) /* filter may consume */ 3501 break; 3502 3503 if (V_pfil_member && ifp != NULL) 3504 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3505 dir, 0, NULL); 3506 3507 if (*mp == NULL || error != 0) /* filter may consume */ 3508 break; 3509 3510 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3511 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3512 dir, 0, NULL); 3513 break; 3514 #endif 3515 default: 3516 error = 0; 3517 break; 3518 } 3519 3520 if (*mp == NULL) 3521 return (error); 3522 if (error != 0) 3523 goto bad; 3524 3525 error = -1; 3526 3527 /* 3528 * Finally, put everything back the way it was and return 3529 */ 3530 if (snap) { 3531 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3532 if (*mp == NULL) 3533 return (error); 3534 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3535 } 3536 3537 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3538 if (*mp == NULL) 3539 return (error); 3540 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3541 3542 return (0); 3543 3544 bad: 3545 m_freem(*mp); 3546 *mp = NULL; 3547 return (error); 3548 } 3549 3550 /* 3551 * Perform basic checks on header size since 3552 * pfil assumes ip_input has already processed 3553 * it for it. Cut-and-pasted from ip_input.c. 3554 * Given how simple the IPv6 version is, 3555 * does the IPv4 version really need to be 3556 * this complicated? 3557 * 3558 * XXX Should we update ipstat here, or not? 3559 * XXX Right now we update ipstat but not 3560 * XXX csum_counter. 3561 */ 3562 static int 3563 bridge_ip_checkbasic(struct mbuf **mp) 3564 { 3565 struct mbuf *m = *mp; 3566 struct ip *ip; 3567 int len, hlen; 3568 u_short sum; 3569 3570 if (*mp == NULL) 3571 return (-1); 3572 3573 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3574 if ((m = m_copyup(m, sizeof(struct ip), 3575 (max_linkhdr + 3) & ~3)) == NULL) { 3576 /* XXXJRT new stat, please */ 3577 KMOD_IPSTAT_INC(ips_toosmall); 3578 goto bad; 3579 } 3580 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3581 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3582 KMOD_IPSTAT_INC(ips_toosmall); 3583 goto bad; 3584 } 3585 } 3586 ip = mtod(m, struct ip *); 3587 if (ip == NULL) goto bad; 3588 3589 if (ip->ip_v != IPVERSION) { 3590 KMOD_IPSTAT_INC(ips_badvers); 3591 goto bad; 3592 } 3593 hlen = ip->ip_hl << 2; 3594 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3595 KMOD_IPSTAT_INC(ips_badhlen); 3596 goto bad; 3597 } 3598 if (hlen > m->m_len) { 3599 if ((m = m_pullup(m, hlen)) == NULL) { 3600 KMOD_IPSTAT_INC(ips_badhlen); 3601 goto bad; 3602 } 3603 ip = mtod(m, struct ip *); 3604 if (ip == NULL) goto bad; 3605 } 3606 3607 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3608 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3609 } else { 3610 if (hlen == sizeof(struct ip)) { 3611 sum = in_cksum_hdr(ip); 3612 } else { 3613 sum = in_cksum(m, hlen); 3614 } 3615 } 3616 if (sum) { 3617 KMOD_IPSTAT_INC(ips_badsum); 3618 goto bad; 3619 } 3620 3621 /* Retrieve the packet length. */ 3622 len = ntohs(ip->ip_len); 3623 3624 /* 3625 * Check for additional length bogosity 3626 */ 3627 if (len < hlen) { 3628 KMOD_IPSTAT_INC(ips_badlen); 3629 goto bad; 3630 } 3631 3632 /* 3633 * Check that the amount of data in the buffers 3634 * is as at least much as the IP header would have us expect. 3635 * Drop packet if shorter than we expect. 3636 */ 3637 if (m->m_pkthdr.len < len) { 3638 KMOD_IPSTAT_INC(ips_tooshort); 3639 goto bad; 3640 } 3641 3642 /* Checks out, proceed */ 3643 *mp = m; 3644 return (0); 3645 3646 bad: 3647 *mp = m; 3648 return (-1); 3649 } 3650 3651 #ifdef INET6 3652 /* 3653 * Same as above, but for IPv6. 3654 * Cut-and-pasted from ip6_input.c. 3655 * XXX Should we update ip6stat, or not? 3656 */ 3657 static int 3658 bridge_ip6_checkbasic(struct mbuf **mp) 3659 { 3660 struct mbuf *m = *mp; 3661 struct ip6_hdr *ip6; 3662 3663 /* 3664 * If the IPv6 header is not aligned, slurp it up into a new 3665 * mbuf with space for link headers, in the event we forward 3666 * it. Otherwise, if it is aligned, make sure the entire base 3667 * IPv6 header is in the first mbuf of the chain. 3668 */ 3669 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3670 struct ifnet *inifp = m->m_pkthdr.rcvif; 3671 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3672 (max_linkhdr + 3) & ~3)) == NULL) { 3673 /* XXXJRT new stat, please */ 3674 IP6STAT_INC(ip6s_toosmall); 3675 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3676 goto bad; 3677 } 3678 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3679 struct ifnet *inifp = m->m_pkthdr.rcvif; 3680 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3681 IP6STAT_INC(ip6s_toosmall); 3682 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3683 goto bad; 3684 } 3685 } 3686 3687 ip6 = mtod(m, struct ip6_hdr *); 3688 3689 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3690 IP6STAT_INC(ip6s_badvers); 3691 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3692 goto bad; 3693 } 3694 3695 /* Checks out, proceed */ 3696 *mp = m; 3697 return (0); 3698 3699 bad: 3700 *mp = m; 3701 return (-1); 3702 } 3703 #endif /* INET6 */ 3704 3705 /* 3706 * bridge_fragment: 3707 * 3708 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3709 */ 3710 static int 3711 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3712 int snap, struct llc *llc) 3713 { 3714 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3715 struct ip *ip; 3716 int error = -1; 3717 3718 if (m->m_len < sizeof(struct ip) && 3719 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3720 goto dropit; 3721 ip = mtod(m, struct ip *); 3722 3723 m->m_pkthdr.csum_flags |= CSUM_IP; 3724 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3725 if (error) 3726 goto dropit; 3727 3728 /* 3729 * Walk the chain and re-add the Ethernet header for 3730 * each mbuf packet. 3731 */ 3732 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3733 nextpkt = mcur->m_nextpkt; 3734 mcur->m_nextpkt = NULL; 3735 if (snap) { 3736 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3737 if (mcur == NULL) { 3738 error = ENOBUFS; 3739 if (mprev != NULL) 3740 mprev->m_nextpkt = nextpkt; 3741 goto dropit; 3742 } 3743 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3744 } 3745 3746 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3747 if (mcur == NULL) { 3748 error = ENOBUFS; 3749 if (mprev != NULL) 3750 mprev->m_nextpkt = nextpkt; 3751 goto dropit; 3752 } 3753 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3754 3755 /* 3756 * The previous two M_PREPEND could have inserted one or two 3757 * mbufs in front so we have to update the previous packet's 3758 * m_nextpkt. 3759 */ 3760 mcur->m_nextpkt = nextpkt; 3761 if (mprev != NULL) 3762 mprev->m_nextpkt = mcur; 3763 else { 3764 /* The first mbuf in the original chain needs to be 3765 * updated. */ 3766 *mp = mcur; 3767 } 3768 mprev = mcur; 3769 } 3770 3771 KMOD_IPSTAT_INC(ips_fragmented); 3772 return (error); 3773 3774 dropit: 3775 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3776 m = mcur->m_nextpkt; 3777 m_freem(mcur); 3778 } 3779 return (error); 3780 } 3781 3782 static void 3783 bridge_linkstate(struct ifnet *ifp) 3784 { 3785 struct bridge_softc *sc = ifp->if_bridge; 3786 struct bridge_iflist *bif; 3787 struct epoch_tracker et; 3788 3789 NET_EPOCH_ENTER_ET(et); 3790 3791 bif = bridge_lookup_member_if(sc, ifp); 3792 if (bif == NULL) { 3793 NET_EPOCH_EXIT_ET(et); 3794 return; 3795 } 3796 bridge_linkcheck(sc); 3797 3798 bstp_linkstate(&bif->bif_stp); 3799 3800 NET_EPOCH_EXIT_ET(et); 3801 } 3802 3803 static void 3804 bridge_linkcheck(struct bridge_softc *sc) 3805 { 3806 struct bridge_iflist *bif; 3807 int new_link, hasls; 3808 3809 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3810 3811 new_link = LINK_STATE_DOWN; 3812 hasls = 0; 3813 /* Our link is considered up if at least one of our ports is active */ 3814 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3815 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3816 hasls++; 3817 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3818 new_link = LINK_STATE_UP; 3819 break; 3820 } 3821 } 3822 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3823 /* If no interfaces support link-state then we default to up */ 3824 new_link = LINK_STATE_UP; 3825 } 3826 if_link_state_change(sc->sc_ifp, new_link); 3827 }
Cache object: c344360544a2fe758a3f04c0b05d56fd
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