1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/if_private.h> 114 #include <net/pfil.h> 115 #include <net/vnet.h> 116 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/in_var.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #ifdef INET6 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/in6_ifattach.h> 126 #endif 127 #if defined(INET) || defined(INET6) 128 #include <netinet/ip_carp.h> 129 #endif 130 #include <machine/in_cksum.h> 131 #include <netinet/if_ether.h> 132 #include <net/bridgestp.h> 133 #include <net/if_bridgevar.h> 134 #include <net/if_llc.h> 135 #include <net/if_vlan_var.h> 136 137 #include <net/route.h> 138 139 /* 140 * Size of the route hash table. Must be a power of two. 141 */ 142 #ifndef BRIDGE_RTHASH_SIZE 143 #define BRIDGE_RTHASH_SIZE 1024 144 #endif 145 146 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 147 148 /* 149 * Default maximum number of addresses to cache. 150 */ 151 #ifndef BRIDGE_RTABLE_MAX 152 #define BRIDGE_RTABLE_MAX 2000 153 #endif 154 155 /* 156 * Timeout (in seconds) for entries learned dynamically. 157 */ 158 #ifndef BRIDGE_RTABLE_TIMEOUT 159 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 160 #endif 161 162 /* 163 * Number of seconds between walks of the route list. 164 */ 165 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 166 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 167 #endif 168 169 /* 170 * List of capabilities to possibly mask on the member interface. 171 */ 172 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 173 IFCAP_TXCSUM_IPV6) 174 175 /* 176 * List of capabilities to strip 177 */ 178 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 179 180 /* 181 * Bridge locking 182 * 183 * The bridge relies heavily on the epoch(9) system to protect its data 184 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 185 * must ensure there is only one writer at a time. 186 * 187 * That is: for read accesses we only need to be in NET_EPOCH, but for write 188 * accesses we must hold: 189 * 190 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 191 * - BRIDGE_LOCK, for any other change 192 * 193 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 194 * calls to bridge member interfaces and these ioctl()s can sleep. 195 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 196 * required while we're in NET_EPOCH and then we're not allowed to sleep. 197 */ 198 #define BRIDGE_LOCK_INIT(_sc) do { \ 199 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 200 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 201 } while (0) 202 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 203 sx_destroy(&(_sc)->sc_sx); \ 204 mtx_destroy(&(_sc)->sc_rt_mtx); \ 205 } while (0) 206 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 207 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 208 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 209 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 210 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 211 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 212 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 213 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 214 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 215 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 216 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 217 218 /* 219 * Bridge interface list entry. 220 */ 221 struct bridge_iflist { 222 CK_LIST_ENTRY(bridge_iflist) bif_next; 223 struct ifnet *bif_ifp; /* member if */ 224 struct bstp_port bif_stp; /* STP state */ 225 uint32_t bif_flags; /* member if flags */ 226 int bif_savedcaps; /* saved capabilities */ 227 uint32_t bif_addrmax; /* max # of addresses */ 228 uint32_t bif_addrcnt; /* cur. # of addresses */ 229 uint32_t bif_addrexceeded;/* # of address violations */ 230 struct epoch_context bif_epoch_ctx; 231 }; 232 233 /* 234 * Bridge route node. 235 */ 236 struct bridge_rtnode { 237 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 238 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 239 struct bridge_iflist *brt_dst; /* destination if */ 240 unsigned long brt_expire; /* expiration time */ 241 uint8_t brt_flags; /* address flags */ 242 uint8_t brt_addr[ETHER_ADDR_LEN]; 243 uint16_t brt_vlan; /* vlan id */ 244 struct vnet *brt_vnet; 245 struct epoch_context brt_epoch_ctx; 246 }; 247 #define brt_ifp brt_dst->bif_ifp 248 249 /* 250 * Software state for each bridge. 251 */ 252 struct bridge_softc { 253 struct ifnet *sc_ifp; /* make this an interface */ 254 LIST_ENTRY(bridge_softc) sc_list; 255 struct sx sc_sx; 256 struct mtx sc_rt_mtx; 257 uint32_t sc_brtmax; /* max # of addresses */ 258 uint32_t sc_brtcnt; /* cur. # of addresses */ 259 uint32_t sc_brttimeout; /* rt timeout in seconds */ 260 struct callout sc_brcallout; /* bridge callout */ 261 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 262 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 263 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 264 uint32_t sc_rthash_key; /* key for hash */ 265 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 266 struct bstp_state sc_stp; /* STP state */ 267 uint32_t sc_brtexceeded; /* # of cache drops */ 268 struct ifnet *sc_ifaddr; /* member mac copied from */ 269 struct ether_addr sc_defaddr; /* Default MAC address */ 270 if_input_fn_t sc_if_input; /* Saved copy of if_input */ 271 struct epoch_context sc_epoch_ctx; 272 }; 273 274 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 275 #define V_bridge_list_sx VNET(bridge_list_sx) 276 static eventhandler_tag bridge_detach_cookie; 277 278 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 279 280 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 281 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 282 283 static int bridge_clone_create(struct if_clone *, char *, size_t, 284 struct ifc_data *, struct ifnet **); 285 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 286 287 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 288 static void bridge_mutecaps(struct bridge_softc *); 289 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 290 int); 291 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 292 static void bridge_init(void *); 293 static void bridge_dummynet(struct mbuf *, struct ifnet *); 294 static void bridge_stop(struct ifnet *, int); 295 static int bridge_transmit(struct ifnet *, struct mbuf *); 296 #ifdef ALTQ 297 static void bridge_altq_start(if_t); 298 static int bridge_altq_transmit(if_t, struct mbuf *); 299 #endif 300 static void bridge_qflush(struct ifnet *); 301 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 302 static void bridge_inject(struct ifnet *, struct mbuf *); 303 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 304 struct rtentry *); 305 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 306 struct mbuf *); 307 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 308 309 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 310 struct mbuf *m); 311 312 static void bridge_timer(void *); 313 314 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 315 struct mbuf *, int); 316 static void bridge_span(struct bridge_softc *, struct mbuf *); 317 318 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 319 uint16_t, struct bridge_iflist *, int, uint8_t); 320 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 321 uint16_t); 322 static void bridge_rttrim(struct bridge_softc *); 323 static void bridge_rtage(struct bridge_softc *); 324 static void bridge_rtflush(struct bridge_softc *, int); 325 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 326 uint16_t); 327 328 static void bridge_rtable_init(struct bridge_softc *); 329 static void bridge_rtable_fini(struct bridge_softc *); 330 331 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 332 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 333 const uint8_t *, uint16_t); 334 static int bridge_rtnode_insert(struct bridge_softc *, 335 struct bridge_rtnode *); 336 static void bridge_rtnode_destroy(struct bridge_softc *, 337 struct bridge_rtnode *); 338 static void bridge_rtable_expire(struct ifnet *, int); 339 static void bridge_state_change(struct ifnet *, int); 340 341 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 342 const char *name); 343 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 344 struct ifnet *ifp); 345 static void bridge_delete_member(struct bridge_softc *, 346 struct bridge_iflist *, int); 347 static void bridge_delete_span(struct bridge_softc *, 348 struct bridge_iflist *); 349 350 static int bridge_ioctl_add(struct bridge_softc *, void *); 351 static int bridge_ioctl_del(struct bridge_softc *, void *); 352 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 353 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 354 static int bridge_ioctl_scache(struct bridge_softc *, void *); 355 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 356 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 357 static int bridge_ioctl_rts(struct bridge_softc *, void *); 358 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 359 static int bridge_ioctl_sto(struct bridge_softc *, void *); 360 static int bridge_ioctl_gto(struct bridge_softc *, void *); 361 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 362 static int bridge_ioctl_flush(struct bridge_softc *, void *); 363 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 364 static int bridge_ioctl_spri(struct bridge_softc *, void *); 365 static int bridge_ioctl_ght(struct bridge_softc *, void *); 366 static int bridge_ioctl_sht(struct bridge_softc *, void *); 367 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 368 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 369 static int bridge_ioctl_gma(struct bridge_softc *, void *); 370 static int bridge_ioctl_sma(struct bridge_softc *, void *); 371 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 372 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 373 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 374 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 375 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 376 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 377 static int bridge_ioctl_grte(struct bridge_softc *, void *); 378 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 379 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 380 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 381 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 382 int); 383 static int bridge_ip_checkbasic(struct mbuf **mp); 384 #ifdef INET6 385 static int bridge_ip6_checkbasic(struct mbuf **mp); 386 #endif /* INET6 */ 387 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 388 struct ether_header *, int, struct llc *); 389 static void bridge_linkstate(struct ifnet *ifp); 390 static void bridge_linkcheck(struct bridge_softc *sc); 391 392 /* 393 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2 394 * to indicate untagged frames. 395 */ 396 #define VLANTAGOF(_m) \ 397 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL 398 399 static struct bstp_cb_ops bridge_ops = { 400 .bcb_state = bridge_state_change, 401 .bcb_rtage = bridge_rtable_expire 402 }; 403 404 SYSCTL_DECL(_net_link); 405 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 406 "Bridge"); 407 408 /* only pass IP[46] packets when pfil is enabled */ 409 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 410 #define V_pfil_onlyip VNET(pfil_onlyip) 411 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 412 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 413 "Only pass IP packets when pfil is enabled"); 414 415 /* run pfil hooks on the bridge interface */ 416 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 417 #define V_pfil_bridge VNET(pfil_bridge) 418 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 419 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 420 "Packet filter on the bridge interface"); 421 422 /* layer2 filter with ipfw */ 423 VNET_DEFINE_STATIC(int, pfil_ipfw); 424 #define V_pfil_ipfw VNET(pfil_ipfw) 425 426 /* layer2 ARP filter with ipfw */ 427 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 428 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 429 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 430 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 431 "Filter ARP packets through IPFW layer2"); 432 433 /* run pfil hooks on the member interface */ 434 VNET_DEFINE_STATIC(int, pfil_member) = 0; 435 #define V_pfil_member VNET(pfil_member) 436 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 437 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 438 "Packet filter on the member interface"); 439 440 /* run pfil hooks on the physical interface for locally destined packets */ 441 VNET_DEFINE_STATIC(int, pfil_local_phys); 442 #define V_pfil_local_phys VNET(pfil_local_phys) 443 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 444 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 445 "Packet filter on the physical interface for locally destined packets"); 446 447 /* log STP state changes */ 448 VNET_DEFINE_STATIC(int, log_stp); 449 #define V_log_stp VNET(log_stp) 450 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 451 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 452 "Log STP state changes"); 453 454 /* share MAC with first bridge member */ 455 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 456 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 457 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 458 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 459 "Inherit MAC address from the first bridge member"); 460 461 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 462 #define V_allow_llz_overlap VNET(allow_llz_overlap) 463 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 464 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 465 "Allow overlap of link-local scope " 466 "zones of a bridge interface and the member interfaces"); 467 468 /* log MAC address port flapping */ 469 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 470 #define V_log_mac_flap VNET(log_mac_flap) 471 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 472 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 473 "Log MAC address port flapping"); 474 475 VNET_DEFINE_STATIC(int, log_interval) = 5; 476 VNET_DEFINE_STATIC(int, log_count) = 0; 477 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 478 479 #define V_log_interval VNET(log_interval) 480 #define V_log_count VNET(log_count) 481 #define V_log_last VNET(log_last) 482 483 struct bridge_control { 484 int (*bc_func)(struct bridge_softc *, void *); 485 int bc_argsize; 486 int bc_flags; 487 }; 488 489 #define BC_F_COPYIN 0x01 /* copy arguments in */ 490 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 491 #define BC_F_SUSER 0x04 /* do super-user check */ 492 493 static const struct bridge_control bridge_control_table[] = { 494 { bridge_ioctl_add, sizeof(struct ifbreq), 495 BC_F_COPYIN|BC_F_SUSER }, 496 { bridge_ioctl_del, sizeof(struct ifbreq), 497 BC_F_COPYIN|BC_F_SUSER }, 498 499 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 500 BC_F_COPYIN|BC_F_COPYOUT }, 501 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 502 BC_F_COPYIN|BC_F_SUSER }, 503 504 { bridge_ioctl_scache, sizeof(struct ifbrparam), 505 BC_F_COPYIN|BC_F_SUSER }, 506 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 507 BC_F_COPYOUT }, 508 509 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 510 BC_F_COPYIN|BC_F_COPYOUT }, 511 { bridge_ioctl_rts, sizeof(struct ifbaconf), 512 BC_F_COPYIN|BC_F_COPYOUT }, 513 514 { bridge_ioctl_saddr, sizeof(struct ifbareq), 515 BC_F_COPYIN|BC_F_SUSER }, 516 517 { bridge_ioctl_sto, sizeof(struct ifbrparam), 518 BC_F_COPYIN|BC_F_SUSER }, 519 { bridge_ioctl_gto, sizeof(struct ifbrparam), 520 BC_F_COPYOUT }, 521 522 { bridge_ioctl_daddr, sizeof(struct ifbareq), 523 BC_F_COPYIN|BC_F_SUSER }, 524 525 { bridge_ioctl_flush, sizeof(struct ifbreq), 526 BC_F_COPYIN|BC_F_SUSER }, 527 528 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 529 BC_F_COPYOUT }, 530 { bridge_ioctl_spri, sizeof(struct ifbrparam), 531 BC_F_COPYIN|BC_F_SUSER }, 532 533 { bridge_ioctl_ght, sizeof(struct ifbrparam), 534 BC_F_COPYOUT }, 535 { bridge_ioctl_sht, sizeof(struct ifbrparam), 536 BC_F_COPYIN|BC_F_SUSER }, 537 538 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 539 BC_F_COPYOUT }, 540 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 541 BC_F_COPYIN|BC_F_SUSER }, 542 543 { bridge_ioctl_gma, sizeof(struct ifbrparam), 544 BC_F_COPYOUT }, 545 { bridge_ioctl_sma, sizeof(struct ifbrparam), 546 BC_F_COPYIN|BC_F_SUSER }, 547 548 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 549 BC_F_COPYIN|BC_F_SUSER }, 550 551 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 552 BC_F_COPYIN|BC_F_SUSER }, 553 554 { bridge_ioctl_addspan, sizeof(struct ifbreq), 555 BC_F_COPYIN|BC_F_SUSER }, 556 { bridge_ioctl_delspan, sizeof(struct ifbreq), 557 BC_F_COPYIN|BC_F_SUSER }, 558 559 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 560 BC_F_COPYOUT }, 561 562 { bridge_ioctl_grte, sizeof(struct ifbrparam), 563 BC_F_COPYOUT }, 564 565 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 566 BC_F_COPYIN|BC_F_COPYOUT }, 567 568 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 569 BC_F_COPYIN|BC_F_SUSER }, 570 571 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 572 BC_F_COPYIN|BC_F_SUSER }, 573 574 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 575 BC_F_COPYIN|BC_F_SUSER }, 576 577 }; 578 static const int bridge_control_table_size = nitems(bridge_control_table); 579 580 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 581 #define V_bridge_list VNET(bridge_list) 582 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 583 "if_bridge list") 584 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 585 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 586 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 587 588 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 589 #define V_bridge_cloner VNET(bridge_cloner) 590 591 static const char bridge_name[] = "bridge"; 592 593 static void 594 vnet_bridge_init(const void *unused __unused) 595 { 596 597 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 598 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 599 UMA_ALIGN_PTR, 0); 600 BRIDGE_LIST_LOCK_INIT(); 601 LIST_INIT(&V_bridge_list); 602 603 struct if_clone_addreq req = { 604 .create_f = bridge_clone_create, 605 .destroy_f = bridge_clone_destroy, 606 .flags = IFC_F_AUTOUNIT, 607 }; 608 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 609 } 610 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 611 vnet_bridge_init, NULL); 612 613 static void 614 vnet_bridge_uninit(const void *unused __unused) 615 { 616 617 ifc_detach_cloner(V_bridge_cloner); 618 V_bridge_cloner = NULL; 619 BRIDGE_LIST_LOCK_DESTROY(); 620 621 /* Callbacks may use the UMA zone. */ 622 NET_EPOCH_DRAIN_CALLBACKS(); 623 624 uma_zdestroy(V_bridge_rtnode_zone); 625 } 626 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 627 vnet_bridge_uninit, NULL); 628 629 static int 630 bridge_modevent(module_t mod, int type, void *data) 631 { 632 633 switch (type) { 634 case MOD_LOAD: 635 bridge_dn_p = bridge_dummynet; 636 bridge_detach_cookie = EVENTHANDLER_REGISTER( 637 ifnet_departure_event, bridge_ifdetach, NULL, 638 EVENTHANDLER_PRI_ANY); 639 break; 640 case MOD_UNLOAD: 641 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 642 bridge_detach_cookie); 643 bridge_dn_p = NULL; 644 break; 645 default: 646 return (EOPNOTSUPP); 647 } 648 return (0); 649 } 650 651 static moduledata_t bridge_mod = { 652 "if_bridge", 653 bridge_modevent, 654 0 655 }; 656 657 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 658 MODULE_VERSION(if_bridge, 1); 659 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 660 661 /* 662 * handler for net.link.bridge.ipfw 663 */ 664 static int 665 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 666 { 667 int enable = V_pfil_ipfw; 668 int error; 669 670 error = sysctl_handle_int(oidp, &enable, 0, req); 671 enable &= 1; 672 673 if (enable != V_pfil_ipfw) { 674 V_pfil_ipfw = enable; 675 676 /* 677 * Disable pfil so that ipfw doesnt run twice, if the user 678 * really wants both then they can re-enable pfil_bridge and/or 679 * pfil_member. Also allow non-ip packets as ipfw can filter by 680 * layer2 type. 681 */ 682 if (V_pfil_ipfw) { 683 V_pfil_onlyip = 0; 684 V_pfil_bridge = 0; 685 V_pfil_member = 0; 686 } 687 } 688 689 return (error); 690 } 691 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 692 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 693 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 694 "Layer2 filter with IPFW"); 695 696 #ifdef VIMAGE 697 static void 698 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 699 { 700 struct bridge_softc *sc = ifp->if_softc; 701 struct bridge_iflist *bif; 702 703 BRIDGE_LOCK(sc); 704 705 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 706 bridge_delete_member(sc, bif, 0); 707 708 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 709 bridge_delete_span(sc, bif); 710 } 711 712 BRIDGE_UNLOCK(sc); 713 714 ether_reassign(ifp, newvnet, arg); 715 } 716 #endif 717 718 /* 719 * bridge_clone_create: 720 * 721 * Create a new bridge instance. 722 */ 723 static int 724 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 725 struct ifc_data *ifd, struct ifnet **ifpp) 726 { 727 struct bridge_softc *sc; 728 struct ifnet *ifp; 729 730 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 731 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 732 if (ifp == NULL) { 733 free(sc, M_DEVBUF); 734 return (ENOSPC); 735 } 736 737 BRIDGE_LOCK_INIT(sc); 738 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 739 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 740 741 /* Initialize our routing table. */ 742 bridge_rtable_init(sc); 743 744 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 745 746 CK_LIST_INIT(&sc->sc_iflist); 747 CK_LIST_INIT(&sc->sc_spanlist); 748 749 ifp->if_softc = sc; 750 if_initname(ifp, bridge_name, ifd->unit); 751 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 752 ifp->if_ioctl = bridge_ioctl; 753 #ifdef ALTQ 754 ifp->if_start = bridge_altq_start; 755 ifp->if_transmit = bridge_altq_transmit; 756 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 757 ifp->if_snd.ifq_drv_maxlen = 0; 758 IFQ_SET_READY(&ifp->if_snd); 759 #else 760 ifp->if_transmit = bridge_transmit; 761 #endif 762 ifp->if_qflush = bridge_qflush; 763 ifp->if_init = bridge_init; 764 ifp->if_type = IFT_BRIDGE; 765 766 ether_gen_addr(ifp, &sc->sc_defaddr); 767 768 bstp_attach(&sc->sc_stp, &bridge_ops); 769 ether_ifattach(ifp, sc->sc_defaddr.octet); 770 /* Now undo some of the damage... */ 771 ifp->if_baudrate = 0; 772 ifp->if_type = IFT_BRIDGE; 773 #ifdef VIMAGE 774 ifp->if_reassign = bridge_reassign; 775 #endif 776 sc->sc_if_input = ifp->if_input; /* ether_input */ 777 ifp->if_input = bridge_inject; 778 779 /* 780 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge 781 * itself via bridge_inject(). This is required for netmap but 782 * otherwise has no effect. 783 */ 784 ifp->if_bridge_input = bridge_input; 785 786 BRIDGE_LIST_LOCK(); 787 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 788 BRIDGE_LIST_UNLOCK(); 789 *ifpp = ifp; 790 791 return (0); 792 } 793 794 static void 795 bridge_clone_destroy_cb(struct epoch_context *ctx) 796 { 797 struct bridge_softc *sc; 798 799 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 800 801 BRIDGE_LOCK_DESTROY(sc); 802 free(sc, M_DEVBUF); 803 } 804 805 /* 806 * bridge_clone_destroy: 807 * 808 * Destroy a bridge instance. 809 */ 810 static int 811 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 812 { 813 struct bridge_softc *sc = ifp->if_softc; 814 struct bridge_iflist *bif; 815 struct epoch_tracker et; 816 817 BRIDGE_LOCK(sc); 818 819 bridge_stop(ifp, 1); 820 ifp->if_flags &= ~IFF_UP; 821 822 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 823 bridge_delete_member(sc, bif, 0); 824 825 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 826 bridge_delete_span(sc, bif); 827 } 828 829 /* Tear down the routing table. */ 830 bridge_rtable_fini(sc); 831 832 BRIDGE_UNLOCK(sc); 833 834 NET_EPOCH_ENTER(et); 835 836 callout_drain(&sc->sc_brcallout); 837 838 BRIDGE_LIST_LOCK(); 839 LIST_REMOVE(sc, sc_list); 840 BRIDGE_LIST_UNLOCK(); 841 842 bstp_detach(&sc->sc_stp); 843 #ifdef ALTQ 844 IFQ_PURGE(&ifp->if_snd); 845 #endif 846 NET_EPOCH_EXIT(et); 847 848 ether_ifdetach(ifp); 849 if_free(ifp); 850 851 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 852 853 return (0); 854 } 855 856 /* 857 * bridge_ioctl: 858 * 859 * Handle a control request from the operator. 860 */ 861 static int 862 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 863 { 864 struct bridge_softc *sc = ifp->if_softc; 865 struct ifreq *ifr = (struct ifreq *)data; 866 struct bridge_iflist *bif; 867 struct thread *td = curthread; 868 union { 869 struct ifbreq ifbreq; 870 struct ifbifconf ifbifconf; 871 struct ifbareq ifbareq; 872 struct ifbaconf ifbaconf; 873 struct ifbrparam ifbrparam; 874 struct ifbropreq ifbropreq; 875 } args; 876 struct ifdrv *ifd = (struct ifdrv *) data; 877 const struct bridge_control *bc; 878 int error = 0, oldmtu; 879 880 BRIDGE_LOCK(sc); 881 882 switch (cmd) { 883 case SIOCADDMULTI: 884 case SIOCDELMULTI: 885 break; 886 887 case SIOCGDRVSPEC: 888 case SIOCSDRVSPEC: 889 if (ifd->ifd_cmd >= bridge_control_table_size) { 890 error = EINVAL; 891 break; 892 } 893 bc = &bridge_control_table[ifd->ifd_cmd]; 894 895 if (cmd == SIOCGDRVSPEC && 896 (bc->bc_flags & BC_F_COPYOUT) == 0) { 897 error = EINVAL; 898 break; 899 } 900 else if (cmd == SIOCSDRVSPEC && 901 (bc->bc_flags & BC_F_COPYOUT) != 0) { 902 error = EINVAL; 903 break; 904 } 905 906 if (bc->bc_flags & BC_F_SUSER) { 907 error = priv_check(td, PRIV_NET_BRIDGE); 908 if (error) 909 break; 910 } 911 912 if (ifd->ifd_len != bc->bc_argsize || 913 ifd->ifd_len > sizeof(args)) { 914 error = EINVAL; 915 break; 916 } 917 918 bzero(&args, sizeof(args)); 919 if (bc->bc_flags & BC_F_COPYIN) { 920 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 921 if (error) 922 break; 923 } 924 925 oldmtu = ifp->if_mtu; 926 error = (*bc->bc_func)(sc, &args); 927 if (error) 928 break; 929 930 /* 931 * Bridge MTU may change during addition of the first port. 932 * If it did, do network layer specific procedure. 933 */ 934 if (ifp->if_mtu != oldmtu) 935 if_notifymtu(ifp); 936 937 if (bc->bc_flags & BC_F_COPYOUT) 938 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 939 940 break; 941 942 case SIOCSIFFLAGS: 943 if (!(ifp->if_flags & IFF_UP) && 944 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 945 /* 946 * If interface is marked down and it is running, 947 * then stop and disable it. 948 */ 949 bridge_stop(ifp, 1); 950 } else if ((ifp->if_flags & IFF_UP) && 951 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 952 /* 953 * If interface is marked up and it is stopped, then 954 * start it. 955 */ 956 BRIDGE_UNLOCK(sc); 957 (*ifp->if_init)(sc); 958 BRIDGE_LOCK(sc); 959 } 960 break; 961 962 case SIOCSIFMTU: 963 oldmtu = sc->sc_ifp->if_mtu; 964 965 if (ifr->ifr_mtu < 576) { 966 error = EINVAL; 967 break; 968 } 969 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 970 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 971 break; 972 } 973 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 974 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 975 SIOCSIFMTU, (caddr_t)ifr); 976 if (error != 0) { 977 log(LOG_NOTICE, "%s: invalid MTU: %u for" 978 " member %s\n", sc->sc_ifp->if_xname, 979 ifr->ifr_mtu, 980 bif->bif_ifp->if_xname); 981 error = EINVAL; 982 break; 983 } 984 } 985 if (error) { 986 /* Restore the previous MTU on all member interfaces. */ 987 ifr->ifr_mtu = oldmtu; 988 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 989 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 990 SIOCSIFMTU, (caddr_t)ifr); 991 } 992 } else { 993 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 994 } 995 break; 996 default: 997 /* 998 * drop the lock as ether_ioctl() will call bridge_start() and 999 * cause the lock to be recursed. 1000 */ 1001 BRIDGE_UNLOCK(sc); 1002 error = ether_ioctl(ifp, cmd, data); 1003 BRIDGE_LOCK(sc); 1004 break; 1005 } 1006 1007 BRIDGE_UNLOCK(sc); 1008 1009 return (error); 1010 } 1011 1012 /* 1013 * bridge_mutecaps: 1014 * 1015 * Clear or restore unwanted capabilities on the member interface 1016 */ 1017 static void 1018 bridge_mutecaps(struct bridge_softc *sc) 1019 { 1020 struct bridge_iflist *bif; 1021 int enabled, mask; 1022 1023 BRIDGE_LOCK_ASSERT(sc); 1024 1025 /* Initial bitmask of capabilities to test */ 1026 mask = BRIDGE_IFCAPS_MASK; 1027 1028 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1029 /* Every member must support it or its disabled */ 1030 mask &= bif->bif_savedcaps; 1031 } 1032 1033 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1034 enabled = bif->bif_ifp->if_capenable; 1035 enabled &= ~BRIDGE_IFCAPS_STRIP; 1036 /* strip off mask bits and enable them again if allowed */ 1037 enabled &= ~BRIDGE_IFCAPS_MASK; 1038 enabled |= mask; 1039 bridge_set_ifcap(sc, bif, enabled); 1040 } 1041 } 1042 1043 static void 1044 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1045 { 1046 struct ifnet *ifp = bif->bif_ifp; 1047 struct ifreq ifr; 1048 int error, mask, stuck; 1049 1050 bzero(&ifr, sizeof(ifr)); 1051 ifr.ifr_reqcap = set; 1052 1053 if (ifp->if_capenable != set) { 1054 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1055 if (error) 1056 if_printf(sc->sc_ifp, 1057 "error setting capabilities on %s: %d\n", 1058 ifp->if_xname, error); 1059 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1060 stuck = ifp->if_capenable & mask & ~set; 1061 if (stuck != 0) 1062 if_printf(sc->sc_ifp, 1063 "can't disable some capabilities on %s: 0x%x\n", 1064 ifp->if_xname, stuck); 1065 } 1066 } 1067 1068 /* 1069 * bridge_lookup_member: 1070 * 1071 * Lookup a bridge member interface. 1072 */ 1073 static struct bridge_iflist * 1074 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1075 { 1076 struct bridge_iflist *bif; 1077 struct ifnet *ifp; 1078 1079 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1080 1081 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1082 ifp = bif->bif_ifp; 1083 if (strcmp(ifp->if_xname, name) == 0) 1084 return (bif); 1085 } 1086 1087 return (NULL); 1088 } 1089 1090 /* 1091 * bridge_lookup_member_if: 1092 * 1093 * Lookup a bridge member interface by ifnet*. 1094 */ 1095 static struct bridge_iflist * 1096 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1097 { 1098 struct bridge_iflist *bif; 1099 1100 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1101 1102 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1103 if (bif->bif_ifp == member_ifp) 1104 return (bif); 1105 } 1106 1107 return (NULL); 1108 } 1109 1110 static void 1111 bridge_delete_member_cb(struct epoch_context *ctx) 1112 { 1113 struct bridge_iflist *bif; 1114 1115 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1116 1117 free(bif, M_DEVBUF); 1118 } 1119 1120 /* 1121 * bridge_delete_member: 1122 * 1123 * Delete the specified member interface. 1124 */ 1125 static void 1126 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1127 int gone) 1128 { 1129 struct ifnet *ifs = bif->bif_ifp; 1130 struct ifnet *fif = NULL; 1131 struct bridge_iflist *bifl; 1132 1133 BRIDGE_LOCK_ASSERT(sc); 1134 1135 if (bif->bif_flags & IFBIF_STP) 1136 bstp_disable(&bif->bif_stp); 1137 1138 ifs->if_bridge = NULL; 1139 CK_LIST_REMOVE(bif, bif_next); 1140 1141 /* 1142 * If removing the interface that gave the bridge its mac address, set 1143 * the mac address of the bridge to the address of the next member, or 1144 * to its default address if no members are left. 1145 */ 1146 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1147 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1148 bcopy(&sc->sc_defaddr, 1149 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1150 sc->sc_ifaddr = NULL; 1151 } else { 1152 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1153 fif = bifl->bif_ifp; 1154 bcopy(IF_LLADDR(fif), 1155 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1156 sc->sc_ifaddr = fif; 1157 } 1158 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1159 } 1160 1161 bridge_linkcheck(sc); 1162 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1163 BRIDGE_RT_LOCK(sc); 1164 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1165 BRIDGE_RT_UNLOCK(sc); 1166 KASSERT(bif->bif_addrcnt == 0, 1167 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1168 1169 ifs->if_bridge_output = NULL; 1170 ifs->if_bridge_input = NULL; 1171 ifs->if_bridge_linkstate = NULL; 1172 if (!gone) { 1173 switch (ifs->if_type) { 1174 case IFT_ETHER: 1175 case IFT_L2VLAN: 1176 /* 1177 * Take the interface out of promiscuous mode, but only 1178 * if it was promiscuous in the first place. It might 1179 * not be if we're in the bridge_ioctl_add() error path. 1180 */ 1181 if (ifs->if_flags & IFF_PROMISC) 1182 (void) ifpromisc(ifs, 0); 1183 break; 1184 1185 case IFT_GIF: 1186 break; 1187 1188 default: 1189 #ifdef DIAGNOSTIC 1190 panic("bridge_delete_member: impossible"); 1191 #endif 1192 break; 1193 } 1194 /* reneable any interface capabilities */ 1195 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1196 } 1197 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1198 1199 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1200 } 1201 1202 /* 1203 * bridge_delete_span: 1204 * 1205 * Delete the specified span interface. 1206 */ 1207 static void 1208 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1209 { 1210 BRIDGE_LOCK_ASSERT(sc); 1211 1212 KASSERT(bif->bif_ifp->if_bridge == NULL, 1213 ("%s: not a span interface", __func__)); 1214 1215 CK_LIST_REMOVE(bif, bif_next); 1216 1217 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1218 } 1219 1220 static int 1221 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1222 { 1223 struct ifbreq *req = arg; 1224 struct bridge_iflist *bif = NULL; 1225 struct ifnet *ifs; 1226 int error = 0; 1227 1228 ifs = ifunit(req->ifbr_ifsname); 1229 if (ifs == NULL) 1230 return (ENOENT); 1231 if (ifs->if_ioctl == NULL) /* must be supported */ 1232 return (EINVAL); 1233 1234 /* If it's in the span list, it can't be a member. */ 1235 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1236 if (ifs == bif->bif_ifp) 1237 return (EBUSY); 1238 1239 if (ifs->if_bridge == sc) 1240 return (EEXIST); 1241 1242 if (ifs->if_bridge != NULL) 1243 return (EBUSY); 1244 1245 switch (ifs->if_type) { 1246 case IFT_ETHER: 1247 case IFT_L2VLAN: 1248 case IFT_GIF: 1249 /* permitted interface types */ 1250 break; 1251 default: 1252 return (EINVAL); 1253 } 1254 1255 #ifdef INET6 1256 /* 1257 * Two valid inet6 addresses with link-local scope must not be 1258 * on the parent interface and the member interfaces at the 1259 * same time. This restriction is needed to prevent violation 1260 * of link-local scope zone. Attempts to add a member 1261 * interface which has inet6 addresses when the parent has 1262 * inet6 triggers removal of all inet6 addresses on the member 1263 * interface. 1264 */ 1265 1266 /* Check if the parent interface has a link-local scope addr. */ 1267 if (V_allow_llz_overlap == 0 && 1268 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1269 /* 1270 * If any, remove all inet6 addresses from the member 1271 * interfaces. 1272 */ 1273 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1274 if (in6ifa_llaonifp(bif->bif_ifp)) { 1275 in6_ifdetach(bif->bif_ifp); 1276 if_printf(sc->sc_ifp, 1277 "IPv6 addresses on %s have been removed " 1278 "before adding it as a member to prevent " 1279 "IPv6 address scope violation.\n", 1280 bif->bif_ifp->if_xname); 1281 } 1282 } 1283 if (in6ifa_llaonifp(ifs)) { 1284 in6_ifdetach(ifs); 1285 if_printf(sc->sc_ifp, 1286 "IPv6 addresses on %s have been removed " 1287 "before adding it as a member to prevent " 1288 "IPv6 address scope violation.\n", 1289 ifs->if_xname); 1290 } 1291 } 1292 #endif 1293 /* Allow the first Ethernet member to define the MTU */ 1294 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1295 sc->sc_ifp->if_mtu = ifs->if_mtu; 1296 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1297 struct ifreq ifr; 1298 1299 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1300 ifs->if_xname); 1301 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1302 1303 error = (*ifs->if_ioctl)(ifs, 1304 SIOCSIFMTU, (caddr_t)&ifr); 1305 if (error != 0) { 1306 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1307 " new member %s\n", sc->sc_ifp->if_xname, 1308 ifr.ifr_mtu, 1309 ifs->if_xname); 1310 return (EINVAL); 1311 } 1312 } 1313 1314 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1315 if (bif == NULL) 1316 return (ENOMEM); 1317 1318 bif->bif_ifp = ifs; 1319 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1320 bif->bif_savedcaps = ifs->if_capenable; 1321 1322 /* 1323 * Assign the interface's MAC address to the bridge if it's the first 1324 * member and the MAC address of the bridge has not been changed from 1325 * the default randomly generated one. 1326 */ 1327 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1328 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1329 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1330 sc->sc_ifaddr = ifs; 1331 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1332 } 1333 1334 ifs->if_bridge = sc; 1335 ifs->if_bridge_output = bridge_output; 1336 ifs->if_bridge_input = bridge_input; 1337 ifs->if_bridge_linkstate = bridge_linkstate; 1338 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1339 /* 1340 * XXX: XLOCK HERE!?! 1341 * 1342 * NOTE: insert_***HEAD*** should be safe for the traversals. 1343 */ 1344 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1345 1346 /* Set interface capabilities to the intersection set of all members */ 1347 bridge_mutecaps(sc); 1348 bridge_linkcheck(sc); 1349 1350 /* Place the interface into promiscuous mode */ 1351 switch (ifs->if_type) { 1352 case IFT_ETHER: 1353 case IFT_L2VLAN: 1354 error = ifpromisc(ifs, 1); 1355 break; 1356 } 1357 1358 if (error) 1359 bridge_delete_member(sc, bif, 0); 1360 return (error); 1361 } 1362 1363 static int 1364 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1365 { 1366 struct ifbreq *req = arg; 1367 struct bridge_iflist *bif; 1368 1369 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1370 if (bif == NULL) 1371 return (ENOENT); 1372 1373 bridge_delete_member(sc, bif, 0); 1374 1375 return (0); 1376 } 1377 1378 static int 1379 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1380 { 1381 struct ifbreq *req = arg; 1382 struct bridge_iflist *bif; 1383 struct bstp_port *bp; 1384 1385 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1386 if (bif == NULL) 1387 return (ENOENT); 1388 1389 bp = &bif->bif_stp; 1390 req->ifbr_ifsflags = bif->bif_flags; 1391 req->ifbr_state = bp->bp_state; 1392 req->ifbr_priority = bp->bp_priority; 1393 req->ifbr_path_cost = bp->bp_path_cost; 1394 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1395 req->ifbr_proto = bp->bp_protover; 1396 req->ifbr_role = bp->bp_role; 1397 req->ifbr_stpflags = bp->bp_flags; 1398 req->ifbr_addrcnt = bif->bif_addrcnt; 1399 req->ifbr_addrmax = bif->bif_addrmax; 1400 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1401 1402 /* Copy STP state options as flags */ 1403 if (bp->bp_operedge) 1404 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1405 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1406 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1407 if (bp->bp_ptp_link) 1408 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1409 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1410 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1411 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1412 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1413 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1414 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1415 return (0); 1416 } 1417 1418 static int 1419 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1420 { 1421 struct epoch_tracker et; 1422 struct ifbreq *req = arg; 1423 struct bridge_iflist *bif; 1424 struct bstp_port *bp; 1425 int error; 1426 1427 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1428 if (bif == NULL) 1429 return (ENOENT); 1430 bp = &bif->bif_stp; 1431 1432 if (req->ifbr_ifsflags & IFBIF_SPAN) 1433 /* SPAN is readonly */ 1434 return (EINVAL); 1435 1436 NET_EPOCH_ENTER(et); 1437 1438 if (req->ifbr_ifsflags & IFBIF_STP) { 1439 if ((bif->bif_flags & IFBIF_STP) == 0) { 1440 error = bstp_enable(&bif->bif_stp); 1441 if (error) { 1442 NET_EPOCH_EXIT(et); 1443 return (error); 1444 } 1445 } 1446 } else { 1447 if ((bif->bif_flags & IFBIF_STP) != 0) 1448 bstp_disable(&bif->bif_stp); 1449 } 1450 1451 /* Pass on STP flags */ 1452 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1453 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1454 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1455 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1456 1457 /* Save the bits relating to the bridge */ 1458 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1459 1460 NET_EPOCH_EXIT(et); 1461 1462 return (0); 1463 } 1464 1465 static int 1466 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1467 { 1468 struct ifbrparam *param = arg; 1469 1470 sc->sc_brtmax = param->ifbrp_csize; 1471 bridge_rttrim(sc); 1472 1473 return (0); 1474 } 1475 1476 static int 1477 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1478 { 1479 struct ifbrparam *param = arg; 1480 1481 param->ifbrp_csize = sc->sc_brtmax; 1482 1483 return (0); 1484 } 1485 1486 static int 1487 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1488 { 1489 struct ifbifconf *bifc = arg; 1490 struct bridge_iflist *bif; 1491 struct ifbreq breq; 1492 char *buf, *outbuf; 1493 int count, buflen, len, error = 0; 1494 1495 count = 0; 1496 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1497 count++; 1498 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1499 count++; 1500 1501 buflen = sizeof(breq) * count; 1502 if (bifc->ifbic_len == 0) { 1503 bifc->ifbic_len = buflen; 1504 return (0); 1505 } 1506 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1507 if (outbuf == NULL) 1508 return (ENOMEM); 1509 1510 count = 0; 1511 buf = outbuf; 1512 len = min(bifc->ifbic_len, buflen); 1513 bzero(&breq, sizeof(breq)); 1514 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1515 if (len < sizeof(breq)) 1516 break; 1517 1518 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1519 sizeof(breq.ifbr_ifsname)); 1520 /* Fill in the ifbreq structure */ 1521 error = bridge_ioctl_gifflags(sc, &breq); 1522 if (error) 1523 break; 1524 memcpy(buf, &breq, sizeof(breq)); 1525 count++; 1526 buf += sizeof(breq); 1527 len -= sizeof(breq); 1528 } 1529 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1530 if (len < sizeof(breq)) 1531 break; 1532 1533 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1534 sizeof(breq.ifbr_ifsname)); 1535 breq.ifbr_ifsflags = bif->bif_flags; 1536 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1537 memcpy(buf, &breq, sizeof(breq)); 1538 count++; 1539 buf += sizeof(breq); 1540 len -= sizeof(breq); 1541 } 1542 1543 bifc->ifbic_len = sizeof(breq) * count; 1544 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1545 free(outbuf, M_TEMP); 1546 return (error); 1547 } 1548 1549 static int 1550 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1551 { 1552 struct ifbaconf *bac = arg; 1553 struct bridge_rtnode *brt; 1554 struct ifbareq bareq; 1555 char *buf, *outbuf; 1556 int count, buflen, len, error = 0; 1557 1558 if (bac->ifbac_len == 0) 1559 return (0); 1560 1561 count = 0; 1562 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1563 count++; 1564 buflen = sizeof(bareq) * count; 1565 1566 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1567 if (outbuf == NULL) 1568 return (ENOMEM); 1569 1570 count = 0; 1571 buf = outbuf; 1572 len = min(bac->ifbac_len, buflen); 1573 bzero(&bareq, sizeof(bareq)); 1574 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1575 if (len < sizeof(bareq)) 1576 goto out; 1577 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1578 sizeof(bareq.ifba_ifsname)); 1579 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1580 bareq.ifba_vlan = brt->brt_vlan; 1581 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1582 time_uptime < brt->brt_expire) 1583 bareq.ifba_expire = brt->brt_expire - time_uptime; 1584 else 1585 bareq.ifba_expire = 0; 1586 bareq.ifba_flags = brt->brt_flags; 1587 1588 memcpy(buf, &bareq, sizeof(bareq)); 1589 count++; 1590 buf += sizeof(bareq); 1591 len -= sizeof(bareq); 1592 } 1593 out: 1594 bac->ifbac_len = sizeof(bareq) * count; 1595 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1596 free(outbuf, M_TEMP); 1597 return (error); 1598 } 1599 1600 static int 1601 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1602 { 1603 struct ifbareq *req = arg; 1604 struct bridge_iflist *bif; 1605 struct epoch_tracker et; 1606 int error; 1607 1608 NET_EPOCH_ENTER(et); 1609 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1610 if (bif == NULL) { 1611 NET_EPOCH_EXIT(et); 1612 return (ENOENT); 1613 } 1614 1615 /* bridge_rtupdate() may acquire the lock. */ 1616 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1617 req->ifba_flags); 1618 NET_EPOCH_EXIT(et); 1619 1620 return (error); 1621 } 1622 1623 static int 1624 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1625 { 1626 struct ifbrparam *param = arg; 1627 1628 sc->sc_brttimeout = param->ifbrp_ctime; 1629 return (0); 1630 } 1631 1632 static int 1633 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1634 { 1635 struct ifbrparam *param = arg; 1636 1637 param->ifbrp_ctime = sc->sc_brttimeout; 1638 return (0); 1639 } 1640 1641 static int 1642 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1643 { 1644 struct ifbareq *req = arg; 1645 int vlan = req->ifba_vlan; 1646 1647 /* Userspace uses '0' to mean 'any vlan' */ 1648 if (vlan == 0) 1649 vlan = DOT1Q_VID_RSVD_IMPL; 1650 1651 return (bridge_rtdaddr(sc, req->ifba_dst, vlan)); 1652 } 1653 1654 static int 1655 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1656 { 1657 struct ifbreq *req = arg; 1658 1659 BRIDGE_RT_LOCK(sc); 1660 bridge_rtflush(sc, req->ifbr_ifsflags); 1661 BRIDGE_RT_UNLOCK(sc); 1662 1663 return (0); 1664 } 1665 1666 static int 1667 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1668 { 1669 struct ifbrparam *param = arg; 1670 struct bstp_state *bs = &sc->sc_stp; 1671 1672 param->ifbrp_prio = bs->bs_bridge_priority; 1673 return (0); 1674 } 1675 1676 static int 1677 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1678 { 1679 struct ifbrparam *param = arg; 1680 1681 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1682 } 1683 1684 static int 1685 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1686 { 1687 struct ifbrparam *param = arg; 1688 struct bstp_state *bs = &sc->sc_stp; 1689 1690 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1691 return (0); 1692 } 1693 1694 static int 1695 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1696 { 1697 struct ifbrparam *param = arg; 1698 1699 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1700 } 1701 1702 static int 1703 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1704 { 1705 struct ifbrparam *param = arg; 1706 struct bstp_state *bs = &sc->sc_stp; 1707 1708 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1709 return (0); 1710 } 1711 1712 static int 1713 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1714 { 1715 struct ifbrparam *param = arg; 1716 1717 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1718 } 1719 1720 static int 1721 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1722 { 1723 struct ifbrparam *param = arg; 1724 struct bstp_state *bs = &sc->sc_stp; 1725 1726 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1727 return (0); 1728 } 1729 1730 static int 1731 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1732 { 1733 struct ifbrparam *param = arg; 1734 1735 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1736 } 1737 1738 static int 1739 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1740 { 1741 struct ifbreq *req = arg; 1742 struct bridge_iflist *bif; 1743 1744 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1745 if (bif == NULL) 1746 return (ENOENT); 1747 1748 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1749 } 1750 1751 static int 1752 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1753 { 1754 struct ifbreq *req = arg; 1755 struct bridge_iflist *bif; 1756 1757 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1758 if (bif == NULL) 1759 return (ENOENT); 1760 1761 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1762 } 1763 1764 static int 1765 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1766 { 1767 struct ifbreq *req = arg; 1768 struct bridge_iflist *bif; 1769 1770 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1771 if (bif == NULL) 1772 return (ENOENT); 1773 1774 bif->bif_addrmax = req->ifbr_addrmax; 1775 return (0); 1776 } 1777 1778 static int 1779 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1780 { 1781 struct ifbreq *req = arg; 1782 struct bridge_iflist *bif = NULL; 1783 struct ifnet *ifs; 1784 1785 ifs = ifunit(req->ifbr_ifsname); 1786 if (ifs == NULL) 1787 return (ENOENT); 1788 1789 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1790 if (ifs == bif->bif_ifp) 1791 return (EBUSY); 1792 1793 if (ifs->if_bridge != NULL) 1794 return (EBUSY); 1795 1796 switch (ifs->if_type) { 1797 case IFT_ETHER: 1798 case IFT_GIF: 1799 case IFT_L2VLAN: 1800 break; 1801 default: 1802 return (EINVAL); 1803 } 1804 1805 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1806 if (bif == NULL) 1807 return (ENOMEM); 1808 1809 bif->bif_ifp = ifs; 1810 bif->bif_flags = IFBIF_SPAN; 1811 1812 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1813 1814 return (0); 1815 } 1816 1817 static int 1818 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1819 { 1820 struct ifbreq *req = arg; 1821 struct bridge_iflist *bif; 1822 struct ifnet *ifs; 1823 1824 ifs = ifunit(req->ifbr_ifsname); 1825 if (ifs == NULL) 1826 return (ENOENT); 1827 1828 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1829 if (ifs == bif->bif_ifp) 1830 break; 1831 1832 if (bif == NULL) 1833 return (ENOENT); 1834 1835 bridge_delete_span(sc, bif); 1836 1837 return (0); 1838 } 1839 1840 static int 1841 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1842 { 1843 struct ifbropreq *req = arg; 1844 struct bstp_state *bs = &sc->sc_stp; 1845 struct bstp_port *root_port; 1846 1847 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1848 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1849 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1850 1851 root_port = bs->bs_root_port; 1852 if (root_port == NULL) 1853 req->ifbop_root_port = 0; 1854 else 1855 req->ifbop_root_port = root_port->bp_ifp->if_index; 1856 1857 req->ifbop_holdcount = bs->bs_txholdcount; 1858 req->ifbop_priority = bs->bs_bridge_priority; 1859 req->ifbop_protocol = bs->bs_protover; 1860 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1861 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1862 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1863 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1864 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1865 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1866 1867 return (0); 1868 } 1869 1870 static int 1871 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1872 { 1873 struct ifbrparam *param = arg; 1874 1875 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1876 return (0); 1877 } 1878 1879 static int 1880 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1881 { 1882 struct ifbpstpconf *bifstp = arg; 1883 struct bridge_iflist *bif; 1884 struct bstp_port *bp; 1885 struct ifbpstpreq bpreq; 1886 char *buf, *outbuf; 1887 int count, buflen, len, error = 0; 1888 1889 count = 0; 1890 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1891 if ((bif->bif_flags & IFBIF_STP) != 0) 1892 count++; 1893 } 1894 1895 buflen = sizeof(bpreq) * count; 1896 if (bifstp->ifbpstp_len == 0) { 1897 bifstp->ifbpstp_len = buflen; 1898 return (0); 1899 } 1900 1901 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1902 if (outbuf == NULL) 1903 return (ENOMEM); 1904 1905 count = 0; 1906 buf = outbuf; 1907 len = min(bifstp->ifbpstp_len, buflen); 1908 bzero(&bpreq, sizeof(bpreq)); 1909 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1910 if (len < sizeof(bpreq)) 1911 break; 1912 1913 if ((bif->bif_flags & IFBIF_STP) == 0) 1914 continue; 1915 1916 bp = &bif->bif_stp; 1917 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1918 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1919 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1920 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1921 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1922 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1923 1924 memcpy(buf, &bpreq, sizeof(bpreq)); 1925 count++; 1926 buf += sizeof(bpreq); 1927 len -= sizeof(bpreq); 1928 } 1929 1930 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1931 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1932 free(outbuf, M_TEMP); 1933 return (error); 1934 } 1935 1936 static int 1937 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1938 { 1939 struct ifbrparam *param = arg; 1940 1941 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1942 } 1943 1944 static int 1945 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1946 { 1947 struct ifbrparam *param = arg; 1948 1949 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1950 } 1951 1952 /* 1953 * bridge_ifdetach: 1954 * 1955 * Detach an interface from a bridge. Called when a member 1956 * interface is detaching. 1957 */ 1958 static void 1959 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1960 { 1961 struct bridge_softc *sc = ifp->if_bridge; 1962 struct bridge_iflist *bif; 1963 1964 if (ifp->if_flags & IFF_RENAMING) 1965 return; 1966 if (V_bridge_cloner == NULL) { 1967 /* 1968 * This detach handler can be called after 1969 * vnet_bridge_uninit(). Just return in that case. 1970 */ 1971 return; 1972 } 1973 /* Check if the interface is a bridge member */ 1974 if (sc != NULL) { 1975 BRIDGE_LOCK(sc); 1976 1977 bif = bridge_lookup_member_if(sc, ifp); 1978 if (bif != NULL) 1979 bridge_delete_member(sc, bif, 1); 1980 1981 BRIDGE_UNLOCK(sc); 1982 return; 1983 } 1984 1985 /* Check if the interface is a span port */ 1986 BRIDGE_LIST_LOCK(); 1987 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1988 BRIDGE_LOCK(sc); 1989 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1990 if (ifp == bif->bif_ifp) { 1991 bridge_delete_span(sc, bif); 1992 break; 1993 } 1994 1995 BRIDGE_UNLOCK(sc); 1996 } 1997 BRIDGE_LIST_UNLOCK(); 1998 } 1999 2000 /* 2001 * bridge_init: 2002 * 2003 * Initialize a bridge interface. 2004 */ 2005 static void 2006 bridge_init(void *xsc) 2007 { 2008 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2009 struct ifnet *ifp = sc->sc_ifp; 2010 2011 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2012 return; 2013 2014 BRIDGE_LOCK(sc); 2015 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2016 bridge_timer, sc); 2017 2018 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2019 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2020 2021 BRIDGE_UNLOCK(sc); 2022 } 2023 2024 /* 2025 * bridge_stop: 2026 * 2027 * Stop the bridge interface. 2028 */ 2029 static void 2030 bridge_stop(struct ifnet *ifp, int disable) 2031 { 2032 struct bridge_softc *sc = ifp->if_softc; 2033 2034 BRIDGE_LOCK_ASSERT(sc); 2035 2036 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2037 return; 2038 2039 BRIDGE_RT_LOCK(sc); 2040 callout_stop(&sc->sc_brcallout); 2041 2042 bstp_stop(&sc->sc_stp); 2043 2044 bridge_rtflush(sc, IFBF_FLUSHDYN); 2045 BRIDGE_RT_UNLOCK(sc); 2046 2047 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2048 } 2049 2050 /* 2051 * bridge_enqueue: 2052 * 2053 * Enqueue a packet on a bridge member interface. 2054 * 2055 */ 2056 static int 2057 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2058 { 2059 int len, err = 0; 2060 short mflags; 2061 struct mbuf *m0; 2062 2063 /* We may be sending a fragment so traverse the mbuf */ 2064 for (; m; m = m0) { 2065 m0 = m->m_nextpkt; 2066 m->m_nextpkt = NULL; 2067 len = m->m_pkthdr.len; 2068 mflags = m->m_flags; 2069 2070 /* 2071 * If underlying interface can not do VLAN tag insertion itself 2072 * then attach a packet tag that holds it. 2073 */ 2074 if ((m->m_flags & M_VLANTAG) && 2075 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2076 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2077 if (m == NULL) { 2078 if_printf(dst_ifp, 2079 "unable to prepend VLAN header\n"); 2080 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2081 continue; 2082 } 2083 m->m_flags &= ~M_VLANTAG; 2084 } 2085 2086 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2087 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2088 int n; 2089 2090 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2091 m0 = m->m_nextpkt; 2092 m_freem(m); 2093 } 2094 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2095 break; 2096 } 2097 2098 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2099 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2100 if (mflags & M_MCAST) 2101 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2102 } 2103 2104 return (err); 2105 } 2106 2107 /* 2108 * bridge_dummynet: 2109 * 2110 * Receive a queued packet from dummynet and pass it on to the output 2111 * interface. 2112 * 2113 * The mbuf has the Ethernet header already attached. 2114 */ 2115 static void 2116 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2117 { 2118 struct bridge_softc *sc; 2119 2120 sc = ifp->if_bridge; 2121 2122 /* 2123 * The packet didnt originate from a member interface. This should only 2124 * ever happen if a member interface is removed while packets are 2125 * queued for it. 2126 */ 2127 if (sc == NULL) { 2128 m_freem(m); 2129 return; 2130 } 2131 2132 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2133 #ifdef INET6 2134 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2135 #endif 2136 ) { 2137 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2138 return; 2139 if (m == NULL) 2140 return; 2141 } 2142 2143 bridge_enqueue(sc, ifp, m); 2144 } 2145 2146 /* 2147 * bridge_output: 2148 * 2149 * Send output from a bridge member interface. This 2150 * performs the bridging function for locally originated 2151 * packets. 2152 * 2153 * The mbuf has the Ethernet header already attached. We must 2154 * enqueue or free the mbuf before returning. 2155 */ 2156 static int 2157 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2158 struct rtentry *rt) 2159 { 2160 struct ether_header *eh; 2161 struct ifnet *bifp, *dst_if; 2162 struct bridge_softc *sc; 2163 uint16_t vlan; 2164 2165 NET_EPOCH_ASSERT(); 2166 2167 if (m->m_len < ETHER_HDR_LEN) { 2168 m = m_pullup(m, ETHER_HDR_LEN); 2169 if (m == NULL) 2170 return (0); 2171 } 2172 2173 eh = mtod(m, struct ether_header *); 2174 sc = ifp->if_bridge; 2175 vlan = VLANTAGOF(m); 2176 2177 bifp = sc->sc_ifp; 2178 2179 /* 2180 * If bridge is down, but the original output interface is up, 2181 * go ahead and send out that interface. Otherwise, the packet 2182 * is dropped below. 2183 */ 2184 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2185 dst_if = ifp; 2186 goto sendunicast; 2187 } 2188 2189 /* 2190 * If the packet is a multicast, or we don't know a better way to 2191 * get there, send to all interfaces. 2192 */ 2193 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2194 dst_if = NULL; 2195 else 2196 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2197 /* Tap any traffic not passing back out the originating interface */ 2198 if (dst_if != ifp) 2199 ETHER_BPF_MTAP(bifp, m); 2200 if (dst_if == NULL) { 2201 struct bridge_iflist *bif; 2202 struct mbuf *mc; 2203 int used = 0; 2204 2205 bridge_span(sc, m); 2206 2207 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2208 dst_if = bif->bif_ifp; 2209 2210 if (dst_if->if_type == IFT_GIF) 2211 continue; 2212 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2213 continue; 2214 2215 /* 2216 * If this is not the original output interface, 2217 * and the interface is participating in spanning 2218 * tree, make sure the port is in a state that 2219 * allows forwarding. 2220 */ 2221 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2222 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2223 continue; 2224 2225 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2226 used = 1; 2227 mc = m; 2228 } else { 2229 mc = m_dup(m, M_NOWAIT); 2230 if (mc == NULL) { 2231 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2232 continue; 2233 } 2234 } 2235 2236 bridge_enqueue(sc, dst_if, mc); 2237 } 2238 if (used == 0) 2239 m_freem(m); 2240 return (0); 2241 } 2242 2243 sendunicast: 2244 /* 2245 * XXX Spanning tree consideration here? 2246 */ 2247 2248 bridge_span(sc, m); 2249 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2250 m_freem(m); 2251 return (0); 2252 } 2253 2254 bridge_enqueue(sc, dst_if, m); 2255 return (0); 2256 } 2257 2258 /* 2259 * bridge_transmit: 2260 * 2261 * Do output on a bridge. 2262 * 2263 */ 2264 static int 2265 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2266 { 2267 struct bridge_softc *sc; 2268 struct ether_header *eh; 2269 struct ifnet *dst_if; 2270 int error = 0; 2271 2272 sc = ifp->if_softc; 2273 2274 ETHER_BPF_MTAP(ifp, m); 2275 2276 eh = mtod(m, struct ether_header *); 2277 2278 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2279 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2280 error = bridge_enqueue(sc, dst_if, m); 2281 } else 2282 bridge_broadcast(sc, ifp, m, 0); 2283 2284 return (error); 2285 } 2286 2287 #ifdef ALTQ 2288 static void 2289 bridge_altq_start(if_t ifp) 2290 { 2291 struct ifaltq *ifq = &ifp->if_snd; 2292 struct mbuf *m; 2293 2294 IFQ_LOCK(ifq); 2295 IFQ_DEQUEUE_NOLOCK(ifq, m); 2296 while (m != NULL) { 2297 bridge_transmit(ifp, m); 2298 IFQ_DEQUEUE_NOLOCK(ifq, m); 2299 } 2300 IFQ_UNLOCK(ifq); 2301 } 2302 2303 static int 2304 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2305 { 2306 int err; 2307 2308 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2309 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2310 if (err == 0) 2311 bridge_altq_start(ifp); 2312 } else 2313 err = bridge_transmit(ifp, m); 2314 2315 return (err); 2316 } 2317 #endif /* ALTQ */ 2318 2319 /* 2320 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2321 */ 2322 static void 2323 bridge_qflush(struct ifnet *ifp __unused) 2324 { 2325 } 2326 2327 /* 2328 * bridge_forward: 2329 * 2330 * The forwarding function of the bridge. 2331 * 2332 * NOTE: Releases the lock on return. 2333 */ 2334 static void 2335 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2336 struct mbuf *m) 2337 { 2338 struct bridge_iflist *dbif; 2339 struct ifnet *src_if, *dst_if, *ifp; 2340 struct ether_header *eh; 2341 uint16_t vlan; 2342 uint8_t *dst; 2343 int error; 2344 2345 NET_EPOCH_ASSERT(); 2346 2347 src_if = m->m_pkthdr.rcvif; 2348 ifp = sc->sc_ifp; 2349 2350 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2351 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2352 vlan = VLANTAGOF(m); 2353 2354 if ((sbif->bif_flags & IFBIF_STP) && 2355 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2356 goto drop; 2357 2358 eh = mtod(m, struct ether_header *); 2359 dst = eh->ether_dhost; 2360 2361 /* If the interface is learning, record the address. */ 2362 if (sbif->bif_flags & IFBIF_LEARNING) { 2363 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2364 sbif, 0, IFBAF_DYNAMIC); 2365 /* 2366 * If the interface has addresses limits then deny any source 2367 * that is not in the cache. 2368 */ 2369 if (error && sbif->bif_addrmax) 2370 goto drop; 2371 } 2372 2373 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2374 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2375 goto drop; 2376 2377 #ifdef DEV_NETMAP 2378 /* 2379 * Hand the packet to netmap only if it wasn't injected by netmap 2380 * itself. 2381 */ 2382 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2383 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2384 ifp->if_input(ifp, m); 2385 return; 2386 } 2387 m->m_flags &= ~M_BRIDGE_INJECT; 2388 #endif 2389 2390 /* 2391 * At this point, the port either doesn't participate 2392 * in spanning tree or it is in the forwarding state. 2393 */ 2394 2395 /* 2396 * If the packet is unicast, destined for someone on 2397 * "this" side of the bridge, drop it. 2398 */ 2399 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2400 dst_if = bridge_rtlookup(sc, dst, vlan); 2401 if (src_if == dst_if) 2402 goto drop; 2403 } else { 2404 /* 2405 * Check if its a reserved multicast address, any address 2406 * listed in 802.1D section 7.12.6 may not be forwarded by the 2407 * bridge. 2408 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2409 */ 2410 if (dst[0] == 0x01 && dst[1] == 0x80 && 2411 dst[2] == 0xc2 && dst[3] == 0x00 && 2412 dst[4] == 0x00 && dst[5] <= 0x0f) 2413 goto drop; 2414 2415 /* ...forward it to all interfaces. */ 2416 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2417 dst_if = NULL; 2418 } 2419 2420 /* 2421 * If we have a destination interface which is a member of our bridge, 2422 * OR this is a unicast packet, push it through the bpf(4) machinery. 2423 * For broadcast or multicast packets, don't bother because it will 2424 * be reinjected into ether_input. We do this before we pass the packets 2425 * through the pfil(9) framework, as it is possible that pfil(9) will 2426 * drop the packet, or possibly modify it, making it difficult to debug 2427 * firewall issues on the bridge. 2428 */ 2429 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2430 ETHER_BPF_MTAP(ifp, m); 2431 2432 /* run the packet filter */ 2433 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2434 #ifdef INET6 2435 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2436 #endif 2437 ) { 2438 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2439 return; 2440 if (m == NULL) 2441 return; 2442 } 2443 2444 if (dst_if == NULL) { 2445 bridge_broadcast(sc, src_if, m, 1); 2446 return; 2447 } 2448 2449 /* 2450 * At this point, we're dealing with a unicast frame 2451 * going to a different interface. 2452 */ 2453 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2454 goto drop; 2455 2456 dbif = bridge_lookup_member_if(sc, dst_if); 2457 if (dbif == NULL) 2458 /* Not a member of the bridge (anymore?) */ 2459 goto drop; 2460 2461 /* Private segments can not talk to each other */ 2462 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2463 goto drop; 2464 2465 if ((dbif->bif_flags & IFBIF_STP) && 2466 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2467 goto drop; 2468 2469 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2470 #ifdef INET6 2471 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2472 #endif 2473 ) { 2474 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2475 return; 2476 if (m == NULL) 2477 return; 2478 } 2479 2480 bridge_enqueue(sc, dst_if, m); 2481 return; 2482 2483 drop: 2484 m_freem(m); 2485 } 2486 2487 /* 2488 * bridge_input: 2489 * 2490 * Receive input from a member interface. Queue the packet for 2491 * bridging if it is not for us. 2492 */ 2493 static struct mbuf * 2494 bridge_input(struct ifnet *ifp, struct mbuf *m) 2495 { 2496 struct bridge_softc *sc; 2497 struct bridge_iflist *bif, *bif2; 2498 struct ifnet *bifp; 2499 struct ether_header *eh; 2500 struct mbuf *mc, *mc2; 2501 uint16_t vlan; 2502 int error; 2503 2504 NET_EPOCH_ASSERT(); 2505 2506 eh = mtod(m, struct ether_header *); 2507 vlan = VLANTAGOF(m); 2508 2509 sc = ifp->if_bridge; 2510 if (sc == NULL) { 2511 /* 2512 * This packet originated from the bridge itself, so it must 2513 * have been transmitted by netmap. Derive the "source" 2514 * interface from the source address and drop the packet if the 2515 * source address isn't known. 2516 */ 2517 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2518 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2519 sc = if_getsoftc(ifp); 2520 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2521 if (ifp == NULL) { 2522 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2523 m_freem(m); 2524 return (NULL); 2525 } 2526 m->m_pkthdr.rcvif = ifp; 2527 } 2528 bifp = sc->sc_ifp; 2529 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2530 return (m); 2531 2532 /* 2533 * Implement support for bridge monitoring. If this flag has been 2534 * set on this interface, discard the packet once we push it through 2535 * the bpf(4) machinery, but before we do, increment the byte and 2536 * packet counters associated with this interface. 2537 */ 2538 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2539 m->m_pkthdr.rcvif = bifp; 2540 ETHER_BPF_MTAP(bifp, m); 2541 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2542 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2543 m_freem(m); 2544 return (NULL); 2545 } 2546 bif = bridge_lookup_member_if(sc, ifp); 2547 if (bif == NULL) { 2548 return (m); 2549 } 2550 2551 bridge_span(sc, m); 2552 2553 if (m->m_flags & (M_BCAST|M_MCAST)) { 2554 /* Tap off 802.1D packets; they do not get forwarded. */ 2555 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2556 ETHER_ADDR_LEN) == 0) { 2557 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2558 return (NULL); 2559 } 2560 2561 if ((bif->bif_flags & IFBIF_STP) && 2562 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2563 return (m); 2564 } 2565 2566 /* 2567 * Make a deep copy of the packet and enqueue the copy 2568 * for bridge processing; return the original packet for 2569 * local processing. 2570 */ 2571 mc = m_dup(m, M_NOWAIT); 2572 if (mc == NULL) { 2573 return (m); 2574 } 2575 2576 /* Perform the bridge forwarding function with the copy. */ 2577 bridge_forward(sc, bif, mc); 2578 2579 #ifdef DEV_NETMAP 2580 /* 2581 * If netmap is enabled and has not already seen this packet, 2582 * then it will be consumed by bridge_forward(). 2583 */ 2584 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2585 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2586 m_freem(m); 2587 return (NULL); 2588 } 2589 #endif 2590 2591 /* 2592 * Reinject the mbuf as arriving on the bridge so we have a 2593 * chance at claiming multicast packets. We can not loop back 2594 * here from ether_input as a bridge is never a member of a 2595 * bridge. 2596 */ 2597 KASSERT(bifp->if_bridge == NULL, 2598 ("loop created in bridge_input")); 2599 mc2 = m_dup(m, M_NOWAIT); 2600 if (mc2 != NULL) { 2601 /* Keep the layer3 header aligned */ 2602 int i = min(mc2->m_pkthdr.len, max_protohdr); 2603 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2604 } 2605 if (mc2 != NULL) { 2606 mc2->m_pkthdr.rcvif = bifp; 2607 mc2->m_flags &= ~M_BRIDGE_INJECT; 2608 sc->sc_if_input(bifp, mc2); 2609 } 2610 2611 /* Return the original packet for local processing. */ 2612 return (m); 2613 } 2614 2615 if ((bif->bif_flags & IFBIF_STP) && 2616 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2617 return (m); 2618 } 2619 2620 #if defined(INET) || defined(INET6) 2621 #define CARP_CHECK_WE_ARE_DST(iface) \ 2622 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 2623 #define CARP_CHECK_WE_ARE_SRC(iface) \ 2624 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 2625 #else 2626 #define CARP_CHECK_WE_ARE_DST(iface) false 2627 #define CARP_CHECK_WE_ARE_SRC(iface) false 2628 #endif 2629 2630 #ifdef INET6 2631 #define PFIL_HOOKED_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 2632 #else 2633 #define PFIL_HOOKED_INET6 false 2634 #endif 2635 2636 #ifdef DEV_NETMAP 2637 #define GRAB_FOR_NETMAP(ifp, m) do { \ 2638 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 2639 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 2640 (ifp)->if_input(ifp, m); \ 2641 return (NULL); \ 2642 } \ 2643 } while (0) 2644 #else 2645 #define GRAB_FOR_NETMAP(ifp, m) 2646 #endif 2647 2648 #define GRAB_OUR_PACKETS(iface) \ 2649 if ((iface)->if_type == IFT_GIF) \ 2650 continue; \ 2651 /* It is destined for us. */ \ 2652 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 2653 CARP_CHECK_WE_ARE_DST(iface)) { \ 2654 if (bif->bif_flags & IFBIF_LEARNING) { \ 2655 error = bridge_rtupdate(sc, eh->ether_shost, \ 2656 vlan, bif, 0, IFBAF_DYNAMIC); \ 2657 if (error && bif->bif_addrmax) { \ 2658 m_freem(m); \ 2659 return (NULL); \ 2660 } \ 2661 } \ 2662 m->m_pkthdr.rcvif = iface; \ 2663 if ((iface) == ifp) { \ 2664 /* Skip bridge processing... src == dest */ \ 2665 return (m); \ 2666 } \ 2667 /* It's passing over or to the bridge, locally. */ \ 2668 ETHER_BPF_MTAP(bifp, m); \ 2669 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2670 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 2671 /* Hand the packet over to netmap if necessary. */ \ 2672 GRAB_FOR_NETMAP(bifp, m); \ 2673 /* Filter on the physical interface. */ \ 2674 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) || \ 2675 PFIL_HOOKED_INET6)) { \ 2676 if (bridge_pfil(&m, NULL, ifp, \ 2677 PFIL_IN) != 0 || m == NULL) { \ 2678 return (NULL); \ 2679 } \ 2680 } \ 2681 if ((iface) != bifp) \ 2682 ETHER_BPF_MTAP(iface, m); \ 2683 return (m); \ 2684 } \ 2685 \ 2686 /* We just received a packet that we sent out. */ \ 2687 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 2688 CARP_CHECK_WE_ARE_SRC(iface)) { \ 2689 m_freem(m); \ 2690 return (NULL); \ 2691 } 2692 2693 /* 2694 * Unicast. Make sure it's not for the bridge. 2695 */ 2696 do { GRAB_OUR_PACKETS(bifp) } while (0); 2697 2698 /* 2699 * Give a chance for ifp at first priority. This will help when the 2700 * packet comes through the interface like VLAN's with the same MACs 2701 * on several interfaces from the same bridge. This also will save 2702 * some CPU cycles in case the destination interface and the input 2703 * interface (eq ifp) are the same. 2704 */ 2705 do { GRAB_OUR_PACKETS(ifp) } while (0); 2706 2707 /* Now check the all bridge members. */ 2708 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2709 GRAB_OUR_PACKETS(bif2->bif_ifp) 2710 } 2711 2712 #undef CARP_CHECK_WE_ARE_DST 2713 #undef CARP_CHECK_WE_ARE_SRC 2714 #undef PFIL_HOOKED_INET6 2715 #undef GRAB_FOR_NETMAP 2716 #undef GRAB_OUR_PACKETS 2717 2718 /* Perform the bridge forwarding function. */ 2719 bridge_forward(sc, bif, m); 2720 2721 return (NULL); 2722 } 2723 2724 /* 2725 * Inject a packet back into the host ethernet stack. This will generally only 2726 * be used by netmap when an application writes to the host TX ring. The 2727 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 2728 * interface after ethernet processing. 2729 */ 2730 static void 2731 bridge_inject(struct ifnet *ifp, struct mbuf *m) 2732 { 2733 struct bridge_softc *sc; 2734 2735 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 2736 ("%s: iface %s is not running in netmap mode", 2737 __func__, if_name(ifp))); 2738 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 2739 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 2740 2741 m->m_flags |= M_BRIDGE_INJECT; 2742 sc = if_getsoftc(ifp); 2743 sc->sc_if_input(ifp, m); 2744 } 2745 2746 /* 2747 * bridge_broadcast: 2748 * 2749 * Send a frame to all interfaces that are members of 2750 * the bridge, except for the one on which the packet 2751 * arrived. 2752 * 2753 * NOTE: Releases the lock on return. 2754 */ 2755 static void 2756 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2757 struct mbuf *m, int runfilt) 2758 { 2759 struct bridge_iflist *dbif, *sbif; 2760 struct mbuf *mc; 2761 struct ifnet *dst_if; 2762 int used = 0, i; 2763 2764 NET_EPOCH_ASSERT(); 2765 2766 sbif = bridge_lookup_member_if(sc, src_if); 2767 2768 /* Filter on the bridge interface before broadcasting */ 2769 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2770 #ifdef INET6 2771 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2772 #endif 2773 )) { 2774 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2775 return; 2776 if (m == NULL) 2777 return; 2778 } 2779 2780 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2781 dst_if = dbif->bif_ifp; 2782 if (dst_if == src_if) 2783 continue; 2784 2785 /* Private segments can not talk to each other */ 2786 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2787 continue; 2788 2789 if ((dbif->bif_flags & IFBIF_STP) && 2790 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2791 continue; 2792 2793 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2794 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2795 continue; 2796 2797 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2798 continue; 2799 2800 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2801 mc = m; 2802 used = 1; 2803 } else { 2804 mc = m_dup(m, M_NOWAIT); 2805 if (mc == NULL) { 2806 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2807 continue; 2808 } 2809 } 2810 2811 /* 2812 * Filter on the output interface. Pass a NULL bridge interface 2813 * pointer so we do not redundantly filter on the bridge for 2814 * each interface we broadcast on. 2815 */ 2816 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2817 #ifdef INET6 2818 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2819 #endif 2820 )) { 2821 if (used == 0) { 2822 /* Keep the layer3 header aligned */ 2823 i = min(mc->m_pkthdr.len, max_protohdr); 2824 mc = m_copyup(mc, i, ETHER_ALIGN); 2825 if (mc == NULL) { 2826 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2827 continue; 2828 } 2829 } 2830 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2831 continue; 2832 if (mc == NULL) 2833 continue; 2834 } 2835 2836 bridge_enqueue(sc, dst_if, mc); 2837 } 2838 if (used == 0) 2839 m_freem(m); 2840 } 2841 2842 /* 2843 * bridge_span: 2844 * 2845 * Duplicate a packet out one or more interfaces that are in span mode, 2846 * the original mbuf is unmodified. 2847 */ 2848 static void 2849 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2850 { 2851 struct bridge_iflist *bif; 2852 struct ifnet *dst_if; 2853 struct mbuf *mc; 2854 2855 NET_EPOCH_ASSERT(); 2856 2857 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2858 return; 2859 2860 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2861 dst_if = bif->bif_ifp; 2862 2863 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2864 continue; 2865 2866 mc = m_dup(m, M_NOWAIT); 2867 if (mc == NULL) { 2868 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2869 continue; 2870 } 2871 2872 bridge_enqueue(sc, dst_if, mc); 2873 } 2874 } 2875 2876 /* 2877 * bridge_rtupdate: 2878 * 2879 * Add a bridge routing entry. 2880 */ 2881 static int 2882 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2883 struct bridge_iflist *bif, int setflags, uint8_t flags) 2884 { 2885 struct bridge_rtnode *brt; 2886 struct bridge_iflist *obif; 2887 int error; 2888 2889 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2890 2891 /* Check the source address is valid and not multicast. */ 2892 if (ETHER_IS_MULTICAST(dst) || 2893 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2894 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2895 return (EINVAL); 2896 2897 /* 2898 * A route for this destination might already exist. If so, 2899 * update it, otherwise create a new one. 2900 */ 2901 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2902 BRIDGE_RT_LOCK(sc); 2903 2904 /* Check again, now that we have the lock. There could have 2905 * been a race and we only want to insert this once. */ 2906 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 2907 BRIDGE_RT_UNLOCK(sc); 2908 return (0); 2909 } 2910 2911 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2912 sc->sc_brtexceeded++; 2913 BRIDGE_RT_UNLOCK(sc); 2914 return (ENOSPC); 2915 } 2916 /* Check per interface address limits (if enabled) */ 2917 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2918 bif->bif_addrexceeded++; 2919 BRIDGE_RT_UNLOCK(sc); 2920 return (ENOSPC); 2921 } 2922 2923 /* 2924 * Allocate a new bridge forwarding node, and 2925 * initialize the expiration time and Ethernet 2926 * address. 2927 */ 2928 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2929 if (brt == NULL) { 2930 BRIDGE_RT_UNLOCK(sc); 2931 return (ENOMEM); 2932 } 2933 brt->brt_vnet = curvnet; 2934 2935 if (bif->bif_flags & IFBIF_STICKY) 2936 brt->brt_flags = IFBAF_STICKY; 2937 else 2938 brt->brt_flags = IFBAF_DYNAMIC; 2939 2940 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2941 brt->brt_vlan = vlan; 2942 2943 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2944 uma_zfree(V_bridge_rtnode_zone, brt); 2945 BRIDGE_RT_UNLOCK(sc); 2946 return (error); 2947 } 2948 brt->brt_dst = bif; 2949 bif->bif_addrcnt++; 2950 2951 BRIDGE_RT_UNLOCK(sc); 2952 } 2953 2954 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2955 (obif = brt->brt_dst) != bif) { 2956 BRIDGE_RT_LOCK(sc); 2957 brt->brt_dst->bif_addrcnt--; 2958 brt->brt_dst = bif; 2959 brt->brt_dst->bif_addrcnt++; 2960 BRIDGE_RT_UNLOCK(sc); 2961 2962 if (V_log_mac_flap && 2963 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 2964 log(LOG_NOTICE, 2965 "%s: mac address %6D vlan %d moved from %s to %s\n", 2966 sc->sc_ifp->if_xname, 2967 &brt->brt_addr[0], ":", 2968 brt->brt_vlan, 2969 obif->bif_ifp->if_xname, 2970 bif->bif_ifp->if_xname); 2971 } 2972 } 2973 2974 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2975 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2976 if (setflags) 2977 brt->brt_flags = flags; 2978 2979 return (0); 2980 } 2981 2982 /* 2983 * bridge_rtlookup: 2984 * 2985 * Lookup the destination interface for an address. 2986 */ 2987 static struct ifnet * 2988 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2989 { 2990 struct bridge_rtnode *brt; 2991 2992 NET_EPOCH_ASSERT(); 2993 2994 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2995 return (NULL); 2996 2997 return (brt->brt_ifp); 2998 } 2999 3000 /* 3001 * bridge_rttrim: 3002 * 3003 * Trim the routine table so that we have a number 3004 * of routing entries less than or equal to the 3005 * maximum number. 3006 */ 3007 static void 3008 bridge_rttrim(struct bridge_softc *sc) 3009 { 3010 struct bridge_rtnode *brt, *nbrt; 3011 3012 NET_EPOCH_ASSERT(); 3013 BRIDGE_RT_LOCK_ASSERT(sc); 3014 3015 /* Make sure we actually need to do this. */ 3016 if (sc->sc_brtcnt <= sc->sc_brtmax) 3017 return; 3018 3019 /* Force an aging cycle; this might trim enough addresses. */ 3020 bridge_rtage(sc); 3021 if (sc->sc_brtcnt <= sc->sc_brtmax) 3022 return; 3023 3024 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3025 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3026 bridge_rtnode_destroy(sc, brt); 3027 if (sc->sc_brtcnt <= sc->sc_brtmax) 3028 return; 3029 } 3030 } 3031 } 3032 3033 /* 3034 * bridge_timer: 3035 * 3036 * Aging timer for the bridge. 3037 */ 3038 static void 3039 bridge_timer(void *arg) 3040 { 3041 struct bridge_softc *sc = arg; 3042 3043 BRIDGE_RT_LOCK_ASSERT(sc); 3044 3045 /* Destruction of rtnodes requires a proper vnet context */ 3046 CURVNET_SET(sc->sc_ifp->if_vnet); 3047 bridge_rtage(sc); 3048 3049 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3050 callout_reset(&sc->sc_brcallout, 3051 bridge_rtable_prune_period * hz, bridge_timer, sc); 3052 CURVNET_RESTORE(); 3053 } 3054 3055 /* 3056 * bridge_rtage: 3057 * 3058 * Perform an aging cycle. 3059 */ 3060 static void 3061 bridge_rtage(struct bridge_softc *sc) 3062 { 3063 struct bridge_rtnode *brt, *nbrt; 3064 3065 BRIDGE_RT_LOCK_ASSERT(sc); 3066 3067 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3068 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3069 if (time_uptime >= brt->brt_expire) 3070 bridge_rtnode_destroy(sc, brt); 3071 } 3072 } 3073 } 3074 3075 /* 3076 * bridge_rtflush: 3077 * 3078 * Remove all dynamic addresses from the bridge. 3079 */ 3080 static void 3081 bridge_rtflush(struct bridge_softc *sc, int full) 3082 { 3083 struct bridge_rtnode *brt, *nbrt; 3084 3085 BRIDGE_RT_LOCK_ASSERT(sc); 3086 3087 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3088 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3089 bridge_rtnode_destroy(sc, brt); 3090 } 3091 } 3092 3093 /* 3094 * bridge_rtdaddr: 3095 * 3096 * Remove an address from the table. 3097 */ 3098 static int 3099 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3100 { 3101 struct bridge_rtnode *brt; 3102 int found = 0; 3103 3104 BRIDGE_RT_LOCK(sc); 3105 3106 /* 3107 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans 3108 * so the lookup may return more than one. 3109 */ 3110 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3111 bridge_rtnode_destroy(sc, brt); 3112 found = 1; 3113 } 3114 3115 BRIDGE_RT_UNLOCK(sc); 3116 3117 return (found ? 0 : ENOENT); 3118 } 3119 3120 /* 3121 * bridge_rtdelete: 3122 * 3123 * Delete routes to a speicifc member interface. 3124 */ 3125 static void 3126 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3127 { 3128 struct bridge_rtnode *brt, *nbrt; 3129 3130 BRIDGE_RT_LOCK_ASSERT(sc); 3131 3132 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3133 if (brt->brt_ifp == ifp && (full || 3134 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3135 bridge_rtnode_destroy(sc, brt); 3136 } 3137 } 3138 3139 /* 3140 * bridge_rtable_init: 3141 * 3142 * Initialize the route table for this bridge. 3143 */ 3144 static void 3145 bridge_rtable_init(struct bridge_softc *sc) 3146 { 3147 int i; 3148 3149 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3150 M_DEVBUF, M_WAITOK); 3151 3152 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3153 CK_LIST_INIT(&sc->sc_rthash[i]); 3154 3155 sc->sc_rthash_key = arc4random(); 3156 CK_LIST_INIT(&sc->sc_rtlist); 3157 } 3158 3159 /* 3160 * bridge_rtable_fini: 3161 * 3162 * Deconstruct the route table for this bridge. 3163 */ 3164 static void 3165 bridge_rtable_fini(struct bridge_softc *sc) 3166 { 3167 3168 KASSERT(sc->sc_brtcnt == 0, 3169 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3170 free(sc->sc_rthash, M_DEVBUF); 3171 } 3172 3173 /* 3174 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3175 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3176 */ 3177 #define mix(a, b, c) \ 3178 do { \ 3179 a -= b; a -= c; a ^= (c >> 13); \ 3180 b -= c; b -= a; b ^= (a << 8); \ 3181 c -= a; c -= b; c ^= (b >> 13); \ 3182 a -= b; a -= c; a ^= (c >> 12); \ 3183 b -= c; b -= a; b ^= (a << 16); \ 3184 c -= a; c -= b; c ^= (b >> 5); \ 3185 a -= b; a -= c; a ^= (c >> 3); \ 3186 b -= c; b -= a; b ^= (a << 10); \ 3187 c -= a; c -= b; c ^= (b >> 15); \ 3188 } while (/*CONSTCOND*/0) 3189 3190 static __inline uint32_t 3191 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3192 { 3193 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3194 3195 b += addr[5] << 8; 3196 b += addr[4]; 3197 a += addr[3] << 24; 3198 a += addr[2] << 16; 3199 a += addr[1] << 8; 3200 a += addr[0]; 3201 3202 mix(a, b, c); 3203 3204 return (c & BRIDGE_RTHASH_MASK); 3205 } 3206 3207 #undef mix 3208 3209 static int 3210 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3211 { 3212 int i, d; 3213 3214 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3215 d = ((int)a[i]) - ((int)b[i]); 3216 } 3217 3218 return (d); 3219 } 3220 3221 /* 3222 * bridge_rtnode_lookup: 3223 * 3224 * Look up a bridge route node for the specified destination. Compare the 3225 * vlan id or if zero then just return the first match. 3226 */ 3227 static struct bridge_rtnode * 3228 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3229 { 3230 struct bridge_rtnode *brt; 3231 uint32_t hash; 3232 int dir; 3233 3234 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3235 3236 hash = bridge_rthash(sc, addr); 3237 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3238 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3239 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL)) 3240 return (brt); 3241 if (dir > 0) 3242 return (NULL); 3243 } 3244 3245 return (NULL); 3246 } 3247 3248 /* 3249 * bridge_rtnode_insert: 3250 * 3251 * Insert the specified bridge node into the route table. We 3252 * assume the entry is not already in the table. 3253 */ 3254 static int 3255 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3256 { 3257 struct bridge_rtnode *lbrt; 3258 uint32_t hash; 3259 int dir; 3260 3261 BRIDGE_RT_LOCK_ASSERT(sc); 3262 3263 hash = bridge_rthash(sc, brt->brt_addr); 3264 3265 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3266 if (lbrt == NULL) { 3267 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3268 goto out; 3269 } 3270 3271 do { 3272 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3273 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3274 return (EEXIST); 3275 if (dir > 0) { 3276 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3277 goto out; 3278 } 3279 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3280 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3281 goto out; 3282 } 3283 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3284 } while (lbrt != NULL); 3285 3286 #ifdef DIAGNOSTIC 3287 panic("bridge_rtnode_insert: impossible"); 3288 #endif 3289 3290 out: 3291 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3292 sc->sc_brtcnt++; 3293 3294 return (0); 3295 } 3296 3297 static void 3298 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3299 { 3300 struct bridge_rtnode *brt; 3301 3302 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3303 3304 CURVNET_SET(brt->brt_vnet); 3305 uma_zfree(V_bridge_rtnode_zone, brt); 3306 CURVNET_RESTORE(); 3307 } 3308 3309 /* 3310 * bridge_rtnode_destroy: 3311 * 3312 * Destroy a bridge rtnode. 3313 */ 3314 static void 3315 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3316 { 3317 BRIDGE_RT_LOCK_ASSERT(sc); 3318 3319 CK_LIST_REMOVE(brt, brt_hash); 3320 3321 CK_LIST_REMOVE(brt, brt_list); 3322 sc->sc_brtcnt--; 3323 brt->brt_dst->bif_addrcnt--; 3324 3325 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3326 } 3327 3328 /* 3329 * bridge_rtable_expire: 3330 * 3331 * Set the expiry time for all routes on an interface. 3332 */ 3333 static void 3334 bridge_rtable_expire(struct ifnet *ifp, int age) 3335 { 3336 struct bridge_softc *sc = ifp->if_bridge; 3337 struct bridge_rtnode *brt; 3338 3339 CURVNET_SET(ifp->if_vnet); 3340 BRIDGE_RT_LOCK(sc); 3341 3342 /* 3343 * If the age is zero then flush, otherwise set all the expiry times to 3344 * age for the interface 3345 */ 3346 if (age == 0) 3347 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3348 else { 3349 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3350 /* Cap the expiry time to 'age' */ 3351 if (brt->brt_ifp == ifp && 3352 brt->brt_expire > time_uptime + age && 3353 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3354 brt->brt_expire = time_uptime + age; 3355 } 3356 } 3357 BRIDGE_RT_UNLOCK(sc); 3358 CURVNET_RESTORE(); 3359 } 3360 3361 /* 3362 * bridge_state_change: 3363 * 3364 * Callback from the bridgestp code when a port changes states. 3365 */ 3366 static void 3367 bridge_state_change(struct ifnet *ifp, int state) 3368 { 3369 struct bridge_softc *sc = ifp->if_bridge; 3370 static const char *stpstates[] = { 3371 "disabled", 3372 "listening", 3373 "learning", 3374 "forwarding", 3375 "blocking", 3376 "discarding" 3377 }; 3378 3379 CURVNET_SET(ifp->if_vnet); 3380 if (V_log_stp) 3381 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3382 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3383 CURVNET_RESTORE(); 3384 } 3385 3386 /* 3387 * Send bridge packets through pfil if they are one of the types pfil can deal 3388 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3389 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3390 * that interface. 3391 */ 3392 static int 3393 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3394 { 3395 int snap, error, i, hlen; 3396 struct ether_header *eh1, eh2; 3397 struct ip *ip; 3398 struct llc llc1; 3399 u_int16_t ether_type; 3400 pfil_return_t rv; 3401 3402 snap = 0; 3403 error = -1; /* Default error if not error == 0 */ 3404 3405 #if 0 3406 /* we may return with the IP fields swapped, ensure its not shared */ 3407 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3408 #endif 3409 3410 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3411 return (0); /* filtering is disabled */ 3412 3413 i = min((*mp)->m_pkthdr.len, max_protohdr); 3414 if ((*mp)->m_len < i) { 3415 *mp = m_pullup(*mp, i); 3416 if (*mp == NULL) { 3417 printf("%s: m_pullup failed\n", __func__); 3418 return (-1); 3419 } 3420 } 3421 3422 eh1 = mtod(*mp, struct ether_header *); 3423 ether_type = ntohs(eh1->ether_type); 3424 3425 /* 3426 * Check for SNAP/LLC. 3427 */ 3428 if (ether_type < ETHERMTU) { 3429 struct llc *llc2 = (struct llc *)(eh1 + 1); 3430 3431 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3432 llc2->llc_dsap == LLC_SNAP_LSAP && 3433 llc2->llc_ssap == LLC_SNAP_LSAP && 3434 llc2->llc_control == LLC_UI) { 3435 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3436 snap = 1; 3437 } 3438 } 3439 3440 /* 3441 * If we're trying to filter bridge traffic, don't look at anything 3442 * other than IP and ARP traffic. If the filter doesn't understand 3443 * IPv6, don't allow IPv6 through the bridge either. This is lame 3444 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3445 * but of course we don't have an AppleTalk filter to begin with. 3446 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3447 * ARP traffic.) 3448 */ 3449 switch (ether_type) { 3450 case ETHERTYPE_ARP: 3451 case ETHERTYPE_REVARP: 3452 if (V_pfil_ipfw_arp == 0) 3453 return (0); /* Automatically pass */ 3454 break; 3455 3456 case ETHERTYPE_IP: 3457 #ifdef INET6 3458 case ETHERTYPE_IPV6: 3459 #endif /* INET6 */ 3460 break; 3461 default: 3462 /* 3463 * Check to see if the user wants to pass non-ip 3464 * packets, these will not be checked by pfil(9) and 3465 * passed unconditionally so the default is to drop. 3466 */ 3467 if (V_pfil_onlyip) 3468 goto bad; 3469 } 3470 3471 /* Run the packet through pfil before stripping link headers */ 3472 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3473 dir == PFIL_OUT && ifp != NULL) { 3474 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 3475 case PFIL_DROPPED: 3476 return (EACCES); 3477 case PFIL_CONSUMED: 3478 return (0); 3479 } 3480 } 3481 3482 /* Strip off the Ethernet header and keep a copy. */ 3483 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3484 m_adj(*mp, ETHER_HDR_LEN); 3485 3486 /* Strip off snap header, if present */ 3487 if (snap) { 3488 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3489 m_adj(*mp, sizeof(struct llc)); 3490 } 3491 3492 /* 3493 * Check the IP header for alignment and errors 3494 */ 3495 if (dir == PFIL_IN) { 3496 switch (ether_type) { 3497 case ETHERTYPE_IP: 3498 error = bridge_ip_checkbasic(mp); 3499 break; 3500 #ifdef INET6 3501 case ETHERTYPE_IPV6: 3502 error = bridge_ip6_checkbasic(mp); 3503 break; 3504 #endif /* INET6 */ 3505 default: 3506 error = 0; 3507 } 3508 if (error) 3509 goto bad; 3510 } 3511 3512 error = 0; 3513 3514 /* 3515 * Run the packet through pfil 3516 */ 3517 rv = PFIL_PASS; 3518 switch (ether_type) { 3519 case ETHERTYPE_IP: 3520 /* 3521 * Run pfil on the member interface and the bridge, both can 3522 * be skipped by clearing pfil_member or pfil_bridge. 3523 * 3524 * Keep the order: 3525 * in_if -> bridge_if -> out_if 3526 */ 3527 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3528 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 3529 PFIL_PASS) 3530 break; 3531 3532 if (V_pfil_member && ifp != NULL) { 3533 rv = (dir == PFIL_OUT) ? 3534 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 3535 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 3536 if (rv != PFIL_PASS) 3537 break; 3538 } 3539 3540 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3541 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 3542 PFIL_PASS) 3543 break; 3544 3545 /* check if we need to fragment the packet */ 3546 /* bridge_fragment generates a mbuf chain of packets */ 3547 /* that already include eth headers */ 3548 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3549 i = (*mp)->m_pkthdr.len; 3550 if (i > ifp->if_mtu) { 3551 error = bridge_fragment(ifp, mp, &eh2, snap, 3552 &llc1); 3553 return (error); 3554 } 3555 } 3556 3557 /* Recalculate the ip checksum. */ 3558 ip = mtod(*mp, struct ip *); 3559 hlen = ip->ip_hl << 2; 3560 if (hlen < sizeof(struct ip)) 3561 goto bad; 3562 if (hlen > (*mp)->m_len) { 3563 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3564 goto bad; 3565 ip = mtod(*mp, struct ip *); 3566 if (ip == NULL) 3567 goto bad; 3568 } 3569 ip->ip_sum = 0; 3570 if (hlen == sizeof(struct ip)) 3571 ip->ip_sum = in_cksum_hdr(ip); 3572 else 3573 ip->ip_sum = in_cksum(*mp, hlen); 3574 3575 break; 3576 #ifdef INET6 3577 case ETHERTYPE_IPV6: 3578 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3579 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 3580 PFIL_PASS) 3581 break; 3582 3583 if (V_pfil_member && ifp != NULL) { 3584 rv = (dir == PFIL_OUT) ? 3585 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 3586 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 3587 if (rv != PFIL_PASS) 3588 break; 3589 } 3590 3591 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3592 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 3593 PFIL_PASS) 3594 break; 3595 break; 3596 #endif 3597 } 3598 3599 switch (rv) { 3600 case PFIL_CONSUMED: 3601 return (0); 3602 case PFIL_DROPPED: 3603 return (EACCES); 3604 default: 3605 break; 3606 } 3607 3608 error = -1; 3609 3610 /* 3611 * Finally, put everything back the way it was and return 3612 */ 3613 if (snap) { 3614 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3615 if (*mp == NULL) 3616 return (error); 3617 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3618 } 3619 3620 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3621 if (*mp == NULL) 3622 return (error); 3623 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3624 3625 return (0); 3626 3627 bad: 3628 m_freem(*mp); 3629 *mp = NULL; 3630 return (error); 3631 } 3632 3633 /* 3634 * Perform basic checks on header size since 3635 * pfil assumes ip_input has already processed 3636 * it for it. Cut-and-pasted from ip_input.c. 3637 * Given how simple the IPv6 version is, 3638 * does the IPv4 version really need to be 3639 * this complicated? 3640 * 3641 * XXX Should we update ipstat here, or not? 3642 * XXX Right now we update ipstat but not 3643 * XXX csum_counter. 3644 */ 3645 static int 3646 bridge_ip_checkbasic(struct mbuf **mp) 3647 { 3648 struct mbuf *m = *mp; 3649 struct ip *ip; 3650 int len, hlen; 3651 u_short sum; 3652 3653 if (*mp == NULL) 3654 return (-1); 3655 3656 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3657 if ((m = m_copyup(m, sizeof(struct ip), 3658 (max_linkhdr + 3) & ~3)) == NULL) { 3659 /* XXXJRT new stat, please */ 3660 KMOD_IPSTAT_INC(ips_toosmall); 3661 goto bad; 3662 } 3663 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3664 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3665 KMOD_IPSTAT_INC(ips_toosmall); 3666 goto bad; 3667 } 3668 } 3669 ip = mtod(m, struct ip *); 3670 if (ip == NULL) goto bad; 3671 3672 if (ip->ip_v != IPVERSION) { 3673 KMOD_IPSTAT_INC(ips_badvers); 3674 goto bad; 3675 } 3676 hlen = ip->ip_hl << 2; 3677 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3678 KMOD_IPSTAT_INC(ips_badhlen); 3679 goto bad; 3680 } 3681 if (hlen > m->m_len) { 3682 if ((m = m_pullup(m, hlen)) == NULL) { 3683 KMOD_IPSTAT_INC(ips_badhlen); 3684 goto bad; 3685 } 3686 ip = mtod(m, struct ip *); 3687 if (ip == NULL) goto bad; 3688 } 3689 3690 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3691 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3692 } else { 3693 if (hlen == sizeof(struct ip)) { 3694 sum = in_cksum_hdr(ip); 3695 } else { 3696 sum = in_cksum(m, hlen); 3697 } 3698 } 3699 if (sum) { 3700 KMOD_IPSTAT_INC(ips_badsum); 3701 goto bad; 3702 } 3703 3704 /* Retrieve the packet length. */ 3705 len = ntohs(ip->ip_len); 3706 3707 /* 3708 * Check for additional length bogosity 3709 */ 3710 if (len < hlen) { 3711 KMOD_IPSTAT_INC(ips_badlen); 3712 goto bad; 3713 } 3714 3715 /* 3716 * Check that the amount of data in the buffers 3717 * is as at least much as the IP header would have us expect. 3718 * Drop packet if shorter than we expect. 3719 */ 3720 if (m->m_pkthdr.len < len) { 3721 KMOD_IPSTAT_INC(ips_tooshort); 3722 goto bad; 3723 } 3724 3725 /* Checks out, proceed */ 3726 *mp = m; 3727 return (0); 3728 3729 bad: 3730 *mp = m; 3731 return (-1); 3732 } 3733 3734 #ifdef INET6 3735 /* 3736 * Same as above, but for IPv6. 3737 * Cut-and-pasted from ip6_input.c. 3738 * XXX Should we update ip6stat, or not? 3739 */ 3740 static int 3741 bridge_ip6_checkbasic(struct mbuf **mp) 3742 { 3743 struct mbuf *m = *mp; 3744 struct ip6_hdr *ip6; 3745 3746 /* 3747 * If the IPv6 header is not aligned, slurp it up into a new 3748 * mbuf with space for link headers, in the event we forward 3749 * it. Otherwise, if it is aligned, make sure the entire base 3750 * IPv6 header is in the first mbuf of the chain. 3751 */ 3752 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3753 struct ifnet *inifp = m->m_pkthdr.rcvif; 3754 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3755 (max_linkhdr + 3) & ~3)) == NULL) { 3756 /* XXXJRT new stat, please */ 3757 IP6STAT_INC(ip6s_toosmall); 3758 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3759 goto bad; 3760 } 3761 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3762 struct ifnet *inifp = m->m_pkthdr.rcvif; 3763 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3764 IP6STAT_INC(ip6s_toosmall); 3765 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3766 goto bad; 3767 } 3768 } 3769 3770 ip6 = mtod(m, struct ip6_hdr *); 3771 3772 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3773 IP6STAT_INC(ip6s_badvers); 3774 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3775 goto bad; 3776 } 3777 3778 /* Checks out, proceed */ 3779 *mp = m; 3780 return (0); 3781 3782 bad: 3783 *mp = m; 3784 return (-1); 3785 } 3786 #endif /* INET6 */ 3787 3788 /* 3789 * bridge_fragment: 3790 * 3791 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3792 */ 3793 static int 3794 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3795 int snap, struct llc *llc) 3796 { 3797 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3798 struct ip *ip; 3799 int error = -1; 3800 3801 if (m->m_len < sizeof(struct ip) && 3802 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3803 goto dropit; 3804 ip = mtod(m, struct ip *); 3805 3806 m->m_pkthdr.csum_flags |= CSUM_IP; 3807 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3808 if (error) 3809 goto dropit; 3810 3811 /* 3812 * Walk the chain and re-add the Ethernet header for 3813 * each mbuf packet. 3814 */ 3815 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3816 nextpkt = mcur->m_nextpkt; 3817 mcur->m_nextpkt = NULL; 3818 if (snap) { 3819 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3820 if (mcur == NULL) { 3821 error = ENOBUFS; 3822 if (mprev != NULL) 3823 mprev->m_nextpkt = nextpkt; 3824 goto dropit; 3825 } 3826 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3827 } 3828 3829 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3830 if (mcur == NULL) { 3831 error = ENOBUFS; 3832 if (mprev != NULL) 3833 mprev->m_nextpkt = nextpkt; 3834 goto dropit; 3835 } 3836 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3837 3838 /* 3839 * The previous two M_PREPEND could have inserted one or two 3840 * mbufs in front so we have to update the previous packet's 3841 * m_nextpkt. 3842 */ 3843 mcur->m_nextpkt = nextpkt; 3844 if (mprev != NULL) 3845 mprev->m_nextpkt = mcur; 3846 else { 3847 /* The first mbuf in the original chain needs to be 3848 * updated. */ 3849 *mp = mcur; 3850 } 3851 mprev = mcur; 3852 } 3853 3854 KMOD_IPSTAT_INC(ips_fragmented); 3855 return (error); 3856 3857 dropit: 3858 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3859 m = mcur->m_nextpkt; 3860 m_freem(mcur); 3861 } 3862 return (error); 3863 } 3864 3865 static void 3866 bridge_linkstate(struct ifnet *ifp) 3867 { 3868 struct bridge_softc *sc = ifp->if_bridge; 3869 struct bridge_iflist *bif; 3870 struct epoch_tracker et; 3871 3872 NET_EPOCH_ENTER(et); 3873 3874 bif = bridge_lookup_member_if(sc, ifp); 3875 if (bif == NULL) { 3876 NET_EPOCH_EXIT(et); 3877 return; 3878 } 3879 bridge_linkcheck(sc); 3880 3881 bstp_linkstate(&bif->bif_stp); 3882 3883 NET_EPOCH_EXIT(et); 3884 } 3885 3886 static void 3887 bridge_linkcheck(struct bridge_softc *sc) 3888 { 3889 struct bridge_iflist *bif; 3890 int new_link, hasls; 3891 3892 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3893 3894 new_link = LINK_STATE_DOWN; 3895 hasls = 0; 3896 /* Our link is considered up if at least one of our ports is active */ 3897 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3898 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3899 hasls++; 3900 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3901 new_link = LINK_STATE_UP; 3902 break; 3903 } 3904 } 3905 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3906 /* If no interfaces support link-state then we default to up */ 3907 new_link = LINK_STATE_UP; 3908 } 3909 if_link_state_change(sc->sc_ifp, new_link); 3910 } 3911