1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/pfil.h> 114 #include <net/vnet.h> 115 116 #include <netinet/in.h> 117 #include <netinet/in_systm.h> 118 #include <netinet/in_var.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #ifdef INET6 122 #include <netinet/ip6.h> 123 #include <netinet6/ip6_var.h> 124 #include <netinet6/in6_ifattach.h> 125 #endif 126 #if defined(INET) || defined(INET6) 127 #include <netinet/ip_carp.h> 128 #endif 129 #include <machine/in_cksum.h> 130 #include <netinet/if_ether.h> 131 #include <net/bridgestp.h> 132 #include <net/if_bridgevar.h> 133 #include <net/if_llc.h> 134 #include <net/if_vlan_var.h> 135 136 #include <net/route.h> 137 138 #ifdef INET6 139 /* 140 * XXX: declare here to avoid to include many inet6 related files.. 141 * should be more generalized? 142 */ 143 extern void nd6_setmtu(struct ifnet *); 144 #endif 145 146 /* 147 * Size of the route hash table. Must be a power of two. 148 */ 149 #ifndef BRIDGE_RTHASH_SIZE 150 #define BRIDGE_RTHASH_SIZE 1024 151 #endif 152 153 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 154 155 /* 156 * Default maximum number of addresses to cache. 157 */ 158 #ifndef BRIDGE_RTABLE_MAX 159 #define BRIDGE_RTABLE_MAX 2000 160 #endif 161 162 /* 163 * Timeout (in seconds) for entries learned dynamically. 164 */ 165 #ifndef BRIDGE_RTABLE_TIMEOUT 166 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 167 #endif 168 169 /* 170 * Number of seconds between walks of the route list. 171 */ 172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 173 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 174 #endif 175 176 /* 177 * List of capabilities to possibly mask on the member interface. 178 */ 179 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 180 IFCAP_TXCSUM_IPV6) 181 182 /* 183 * List of capabilities to strip 184 */ 185 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 186 187 /* 188 * Bridge locking 189 * 190 * The bridge relies heavily on the epoch(9) system to protect its data 191 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 192 * must ensure there is only one writer at a time. 193 * 194 * That is: for read accesses we only need to be in NET_EPOCH, but for write 195 * accesses we must hold: 196 * 197 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 198 * - BRIDGE_LOCK, for any other change 199 * 200 * The BRIDGE_LOCK is a sleepable lock, because it is held accross ioctl() 201 * calls to bridge member interfaces and these ioctl()s can sleep. 202 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 203 * required while we're in NET_EPOCH and then we're not allowed to sleep. 204 */ 205 #define BRIDGE_LOCK_INIT(_sc) do { \ 206 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 207 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 208 } while (0) 209 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 210 sx_destroy(&(_sc)->sc_sx); \ 211 mtx_destroy(&(_sc)->sc_rt_mtx); \ 212 } while (0) 213 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 214 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 215 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 216 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 217 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 218 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 219 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 220 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 221 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 222 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 223 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 224 225 /* 226 * Bridge interface list entry. 227 */ 228 struct bridge_iflist { 229 CK_LIST_ENTRY(bridge_iflist) bif_next; 230 struct ifnet *bif_ifp; /* member if */ 231 struct bstp_port bif_stp; /* STP state */ 232 uint32_t bif_flags; /* member if flags */ 233 int bif_savedcaps; /* saved capabilities */ 234 uint32_t bif_addrmax; /* max # of addresses */ 235 uint32_t bif_addrcnt; /* cur. # of addresses */ 236 uint32_t bif_addrexceeded;/* # of address violations */ 237 struct epoch_context bif_epoch_ctx; 238 }; 239 240 /* 241 * Bridge route node. 242 */ 243 struct bridge_rtnode { 244 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 245 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 246 struct bridge_iflist *brt_dst; /* destination if */ 247 unsigned long brt_expire; /* expiration time */ 248 uint8_t brt_flags; /* address flags */ 249 uint8_t brt_addr[ETHER_ADDR_LEN]; 250 uint16_t brt_vlan; /* vlan id */ 251 struct vnet *brt_vnet; 252 struct epoch_context brt_epoch_ctx; 253 }; 254 #define brt_ifp brt_dst->bif_ifp 255 256 /* 257 * Software state for each bridge. 258 */ 259 struct bridge_softc { 260 struct ifnet *sc_ifp; /* make this an interface */ 261 LIST_ENTRY(bridge_softc) sc_list; 262 struct sx sc_sx; 263 struct mtx sc_rt_mtx; 264 uint32_t sc_brtmax; /* max # of addresses */ 265 uint32_t sc_brtcnt; /* cur. # of addresses */ 266 uint32_t sc_brttimeout; /* rt timeout in seconds */ 267 struct callout sc_brcallout; /* bridge callout */ 268 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 269 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 270 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 271 uint32_t sc_rthash_key; /* key for hash */ 272 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 273 struct bstp_state sc_stp; /* STP state */ 274 uint32_t sc_brtexceeded; /* # of cache drops */ 275 struct ifnet *sc_ifaddr; /* member mac copied from */ 276 struct ether_addr sc_defaddr; /* Default MAC address */ 277 struct epoch_context sc_epoch_ctx; 278 }; 279 280 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 281 #define V_bridge_list_sx VNET(bridge_list_sx) 282 static eventhandler_tag bridge_detach_cookie; 283 284 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 285 286 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 287 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 288 289 static int bridge_clone_create(struct if_clone *, int, caddr_t); 290 static void bridge_clone_destroy(struct ifnet *); 291 292 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 293 static void bridge_mutecaps(struct bridge_softc *); 294 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 295 int); 296 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 297 static void bridge_init(void *); 298 static void bridge_dummynet(struct mbuf *, struct ifnet *); 299 static void bridge_stop(struct ifnet *, int); 300 static int bridge_transmit(struct ifnet *, struct mbuf *); 301 static void bridge_qflush(struct ifnet *); 302 static struct mbuf *bridge_input(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 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 393 #define VLANTAGOF(_m) \ 394 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 395 396 static struct bstp_cb_ops bridge_ops = { 397 .bcb_state = bridge_state_change, 398 .bcb_rtage = bridge_rtable_expire 399 }; 400 401 SYSCTL_DECL(_net_link); 402 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 403 "Bridge"); 404 405 /* only pass IP[46] packets when pfil is enabled */ 406 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 407 #define V_pfil_onlyip VNET(pfil_onlyip) 408 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 409 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 410 "Only pass IP packets when pfil is enabled"); 411 412 /* run pfil hooks on the bridge interface */ 413 VNET_DEFINE_STATIC(int, pfil_bridge) = 1; 414 #define V_pfil_bridge VNET(pfil_bridge) 415 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 416 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 417 "Packet filter on the bridge interface"); 418 419 /* layer2 filter with ipfw */ 420 VNET_DEFINE_STATIC(int, pfil_ipfw); 421 #define V_pfil_ipfw VNET(pfil_ipfw) 422 423 /* layer2 ARP filter with ipfw */ 424 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 425 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 426 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 427 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 428 "Filter ARP packets through IPFW layer2"); 429 430 /* run pfil hooks on the member interface */ 431 VNET_DEFINE_STATIC(int, pfil_member) = 1; 432 #define V_pfil_member VNET(pfil_member) 433 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 434 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 435 "Packet filter on the member interface"); 436 437 /* run pfil hooks on the physical interface for locally destined packets */ 438 VNET_DEFINE_STATIC(int, pfil_local_phys); 439 #define V_pfil_local_phys VNET(pfil_local_phys) 440 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 441 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 442 "Packet filter on the physical interface for locally destined packets"); 443 444 /* log STP state changes */ 445 VNET_DEFINE_STATIC(int, log_stp); 446 #define V_log_stp VNET(log_stp) 447 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 448 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 449 "Log STP state changes"); 450 451 /* share MAC with first bridge member */ 452 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 453 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 454 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 455 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 456 "Inherit MAC address from the first bridge member"); 457 458 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 459 #define V_allow_llz_overlap VNET(allow_llz_overlap) 460 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 461 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 462 "Allow overlap of link-local scope " 463 "zones of a bridge interface and the member interfaces"); 464 465 struct bridge_control { 466 int (*bc_func)(struct bridge_softc *, void *); 467 int bc_argsize; 468 int bc_flags; 469 }; 470 471 #define BC_F_COPYIN 0x01 /* copy arguments in */ 472 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 473 #define BC_F_SUSER 0x04 /* do super-user check */ 474 475 const struct bridge_control bridge_control_table[] = { 476 { bridge_ioctl_add, sizeof(struct ifbreq), 477 BC_F_COPYIN|BC_F_SUSER }, 478 { bridge_ioctl_del, sizeof(struct ifbreq), 479 BC_F_COPYIN|BC_F_SUSER }, 480 481 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 482 BC_F_COPYIN|BC_F_COPYOUT }, 483 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 484 BC_F_COPYIN|BC_F_SUSER }, 485 486 { bridge_ioctl_scache, sizeof(struct ifbrparam), 487 BC_F_COPYIN|BC_F_SUSER }, 488 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 489 BC_F_COPYOUT }, 490 491 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 492 BC_F_COPYIN|BC_F_COPYOUT }, 493 { bridge_ioctl_rts, sizeof(struct ifbaconf), 494 BC_F_COPYIN|BC_F_COPYOUT }, 495 496 { bridge_ioctl_saddr, sizeof(struct ifbareq), 497 BC_F_COPYIN|BC_F_SUSER }, 498 499 { bridge_ioctl_sto, sizeof(struct ifbrparam), 500 BC_F_COPYIN|BC_F_SUSER }, 501 { bridge_ioctl_gto, sizeof(struct ifbrparam), 502 BC_F_COPYOUT }, 503 504 { bridge_ioctl_daddr, sizeof(struct ifbareq), 505 BC_F_COPYIN|BC_F_SUSER }, 506 507 { bridge_ioctl_flush, sizeof(struct ifbreq), 508 BC_F_COPYIN|BC_F_SUSER }, 509 510 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 511 BC_F_COPYOUT }, 512 { bridge_ioctl_spri, sizeof(struct ifbrparam), 513 BC_F_COPYIN|BC_F_SUSER }, 514 515 { bridge_ioctl_ght, sizeof(struct ifbrparam), 516 BC_F_COPYOUT }, 517 { bridge_ioctl_sht, sizeof(struct ifbrparam), 518 BC_F_COPYIN|BC_F_SUSER }, 519 520 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 521 BC_F_COPYOUT }, 522 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 523 BC_F_COPYIN|BC_F_SUSER }, 524 525 { bridge_ioctl_gma, sizeof(struct ifbrparam), 526 BC_F_COPYOUT }, 527 { bridge_ioctl_sma, sizeof(struct ifbrparam), 528 BC_F_COPYIN|BC_F_SUSER }, 529 530 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 531 BC_F_COPYIN|BC_F_SUSER }, 532 533 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 534 BC_F_COPYIN|BC_F_SUSER }, 535 536 { bridge_ioctl_addspan, sizeof(struct ifbreq), 537 BC_F_COPYIN|BC_F_SUSER }, 538 { bridge_ioctl_delspan, sizeof(struct ifbreq), 539 BC_F_COPYIN|BC_F_SUSER }, 540 541 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 542 BC_F_COPYOUT }, 543 544 { bridge_ioctl_grte, sizeof(struct ifbrparam), 545 BC_F_COPYOUT }, 546 547 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 548 BC_F_COPYIN|BC_F_COPYOUT }, 549 550 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 551 BC_F_COPYIN|BC_F_SUSER }, 552 553 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 554 BC_F_COPYIN|BC_F_SUSER }, 555 556 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 557 BC_F_COPYIN|BC_F_SUSER }, 558 559 }; 560 const int bridge_control_table_size = nitems(bridge_control_table); 561 562 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 563 #define V_bridge_list VNET(bridge_list) 564 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 565 "if_bridge list") 566 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 567 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 568 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 569 570 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 571 #define V_bridge_cloner VNET(bridge_cloner) 572 573 static const char bridge_name[] = "bridge"; 574 575 static void 576 vnet_bridge_init(const void *unused __unused) 577 { 578 579 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 580 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 581 UMA_ALIGN_PTR, 0); 582 BRIDGE_LIST_LOCK_INIT(); 583 LIST_INIT(&V_bridge_list); 584 V_bridge_cloner = if_clone_simple(bridge_name, 585 bridge_clone_create, bridge_clone_destroy, 0); 586 } 587 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 588 vnet_bridge_init, NULL); 589 590 static void 591 vnet_bridge_uninit(const void *unused __unused) 592 { 593 594 if_clone_detach(V_bridge_cloner); 595 V_bridge_cloner = NULL; 596 BRIDGE_LIST_LOCK_DESTROY(); 597 598 /* Callbacks may use the UMA zone. */ 599 epoch_drain_callbacks(net_epoch_preempt); 600 601 uma_zdestroy(V_bridge_rtnode_zone); 602 } 603 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 604 vnet_bridge_uninit, NULL); 605 606 static int 607 bridge_modevent(module_t mod, int type, void *data) 608 { 609 610 switch (type) { 611 case MOD_LOAD: 612 bridge_dn_p = bridge_dummynet; 613 bridge_detach_cookie = EVENTHANDLER_REGISTER( 614 ifnet_departure_event, bridge_ifdetach, NULL, 615 EVENTHANDLER_PRI_ANY); 616 break; 617 case MOD_UNLOAD: 618 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 619 bridge_detach_cookie); 620 bridge_dn_p = NULL; 621 break; 622 default: 623 return (EOPNOTSUPP); 624 } 625 return (0); 626 } 627 628 static moduledata_t bridge_mod = { 629 "if_bridge", 630 bridge_modevent, 631 0 632 }; 633 634 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 635 MODULE_VERSION(if_bridge, 1); 636 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 637 638 /* 639 * handler for net.link.bridge.ipfw 640 */ 641 static int 642 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 643 { 644 int enable = V_pfil_ipfw; 645 int error; 646 647 error = sysctl_handle_int(oidp, &enable, 0, req); 648 enable &= 1; 649 650 if (enable != V_pfil_ipfw) { 651 V_pfil_ipfw = enable; 652 653 /* 654 * Disable pfil so that ipfw doesnt run twice, if the user 655 * really wants both then they can re-enable pfil_bridge and/or 656 * pfil_member. Also allow non-ip packets as ipfw can filter by 657 * layer2 type. 658 */ 659 if (V_pfil_ipfw) { 660 V_pfil_onlyip = 0; 661 V_pfil_bridge = 0; 662 V_pfil_member = 0; 663 } 664 } 665 666 return (error); 667 } 668 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 669 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 670 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 671 "Layer2 filter with IPFW"); 672 673 #ifdef VIMAGE 674 static void 675 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 676 { 677 struct bridge_softc *sc = ifp->if_softc; 678 struct bridge_iflist *bif; 679 680 BRIDGE_LOCK(sc); 681 682 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 683 bridge_delete_member(sc, bif, 0); 684 685 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 686 bridge_delete_span(sc, bif); 687 } 688 689 BRIDGE_UNLOCK(sc); 690 691 ether_reassign(ifp, newvnet, arg); 692 } 693 #endif 694 695 /* 696 * bridge_clone_create: 697 * 698 * Create a new bridge instance. 699 */ 700 static int 701 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 702 { 703 struct bridge_softc *sc; 704 struct ifnet *ifp; 705 706 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 707 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 708 if (ifp == NULL) { 709 free(sc, M_DEVBUF); 710 return (ENOSPC); 711 } 712 713 BRIDGE_LOCK_INIT(sc); 714 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 715 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 716 717 /* Initialize our routing table. */ 718 bridge_rtable_init(sc); 719 720 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 721 722 CK_LIST_INIT(&sc->sc_iflist); 723 CK_LIST_INIT(&sc->sc_spanlist); 724 725 ifp->if_softc = sc; 726 if_initname(ifp, bridge_name, unit); 727 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 728 ifp->if_ioctl = bridge_ioctl; 729 ifp->if_transmit = bridge_transmit; 730 ifp->if_qflush = bridge_qflush; 731 ifp->if_init = bridge_init; 732 ifp->if_type = IFT_BRIDGE; 733 734 ether_gen_addr(ifp, &sc->sc_defaddr); 735 736 bstp_attach(&sc->sc_stp, &bridge_ops); 737 ether_ifattach(ifp, sc->sc_defaddr.octet); 738 /* Now undo some of the damage... */ 739 ifp->if_baudrate = 0; 740 ifp->if_type = IFT_BRIDGE; 741 #ifdef VIMAGE 742 ifp->if_reassign = bridge_reassign; 743 #endif 744 745 BRIDGE_LIST_LOCK(); 746 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 747 BRIDGE_LIST_UNLOCK(); 748 749 return (0); 750 } 751 752 static void 753 bridge_clone_destroy_cb(struct epoch_context *ctx) 754 { 755 struct bridge_softc *sc; 756 757 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 758 759 BRIDGE_LOCK_DESTROY(sc); 760 free(sc, M_DEVBUF); 761 } 762 763 /* 764 * bridge_clone_destroy: 765 * 766 * Destroy a bridge instance. 767 */ 768 static void 769 bridge_clone_destroy(struct ifnet *ifp) 770 { 771 struct bridge_softc *sc = ifp->if_softc; 772 struct bridge_iflist *bif; 773 struct epoch_tracker et; 774 775 BRIDGE_LOCK(sc); 776 777 bridge_stop(ifp, 1); 778 ifp->if_flags &= ~IFF_UP; 779 780 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 781 bridge_delete_member(sc, bif, 0); 782 783 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 784 bridge_delete_span(sc, bif); 785 } 786 787 /* Tear down the routing table. */ 788 bridge_rtable_fini(sc); 789 790 BRIDGE_UNLOCK(sc); 791 792 NET_EPOCH_ENTER(et); 793 794 callout_drain(&sc->sc_brcallout); 795 796 BRIDGE_LIST_LOCK(); 797 LIST_REMOVE(sc, sc_list); 798 BRIDGE_LIST_UNLOCK(); 799 800 bstp_detach(&sc->sc_stp); 801 NET_EPOCH_EXIT(et); 802 803 ether_ifdetach(ifp); 804 if_free(ifp); 805 806 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 807 } 808 809 /* 810 * bridge_ioctl: 811 * 812 * Handle a control request from the operator. 813 */ 814 static int 815 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 816 { 817 struct bridge_softc *sc = ifp->if_softc; 818 struct ifreq *ifr = (struct ifreq *)data; 819 struct bridge_iflist *bif; 820 struct thread *td = curthread; 821 union { 822 struct ifbreq ifbreq; 823 struct ifbifconf ifbifconf; 824 struct ifbareq ifbareq; 825 struct ifbaconf ifbaconf; 826 struct ifbrparam ifbrparam; 827 struct ifbropreq ifbropreq; 828 } args; 829 struct ifdrv *ifd = (struct ifdrv *) data; 830 const struct bridge_control *bc; 831 int error = 0, oldmtu; 832 833 BRIDGE_LOCK(sc); 834 835 switch (cmd) { 836 case SIOCADDMULTI: 837 case SIOCDELMULTI: 838 break; 839 840 case SIOCGDRVSPEC: 841 case SIOCSDRVSPEC: 842 if (ifd->ifd_cmd >= bridge_control_table_size) { 843 error = EINVAL; 844 break; 845 } 846 bc = &bridge_control_table[ifd->ifd_cmd]; 847 848 if (cmd == SIOCGDRVSPEC && 849 (bc->bc_flags & BC_F_COPYOUT) == 0) { 850 error = EINVAL; 851 break; 852 } 853 else if (cmd == SIOCSDRVSPEC && 854 (bc->bc_flags & BC_F_COPYOUT) != 0) { 855 error = EINVAL; 856 break; 857 } 858 859 if (bc->bc_flags & BC_F_SUSER) { 860 error = priv_check(td, PRIV_NET_BRIDGE); 861 if (error) 862 break; 863 } 864 865 if (ifd->ifd_len != bc->bc_argsize || 866 ifd->ifd_len > sizeof(args)) { 867 error = EINVAL; 868 break; 869 } 870 871 bzero(&args, sizeof(args)); 872 if (bc->bc_flags & BC_F_COPYIN) { 873 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 874 if (error) 875 break; 876 } 877 878 oldmtu = ifp->if_mtu; 879 error = (*bc->bc_func)(sc, &args); 880 if (error) 881 break; 882 883 /* 884 * Bridge MTU may change during addition of the first port. 885 * If it did, do network layer specific procedure. 886 */ 887 if (ifp->if_mtu != oldmtu) { 888 #ifdef INET6 889 nd6_setmtu(ifp); 890 #endif 891 rt_updatemtu(ifp); 892 } 893 894 if (bc->bc_flags & BC_F_COPYOUT) 895 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 896 897 break; 898 899 case SIOCSIFFLAGS: 900 if (!(ifp->if_flags & IFF_UP) && 901 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 902 /* 903 * If interface is marked down and it is running, 904 * then stop and disable it. 905 */ 906 bridge_stop(ifp, 1); 907 } else if ((ifp->if_flags & IFF_UP) && 908 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 909 /* 910 * If interface is marked up and it is stopped, then 911 * start it. 912 */ 913 BRIDGE_UNLOCK(sc); 914 (*ifp->if_init)(sc); 915 BRIDGE_LOCK(sc); 916 } 917 break; 918 919 case SIOCSIFMTU: 920 if (ifr->ifr_mtu < 576) { 921 error = EINVAL; 922 break; 923 } 924 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 925 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 926 break; 927 } 928 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 929 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 930 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 931 " != %d\n", sc->sc_ifp->if_xname, 932 bif->bif_ifp->if_mtu, 933 bif->bif_ifp->if_xname, ifr->ifr_mtu); 934 error = EINVAL; 935 break; 936 } 937 } 938 if (!error) 939 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 940 break; 941 default: 942 /* 943 * drop the lock as ether_ioctl() will call bridge_start() and 944 * cause the lock to be recursed. 945 */ 946 BRIDGE_UNLOCK(sc); 947 error = ether_ioctl(ifp, cmd, data); 948 BRIDGE_LOCK(sc); 949 break; 950 } 951 952 BRIDGE_UNLOCK(sc); 953 954 return (error); 955 } 956 957 /* 958 * bridge_mutecaps: 959 * 960 * Clear or restore unwanted capabilities on the member interface 961 */ 962 static void 963 bridge_mutecaps(struct bridge_softc *sc) 964 { 965 struct bridge_iflist *bif; 966 int enabled, mask; 967 968 BRIDGE_LOCK_ASSERT(sc); 969 970 /* Initial bitmask of capabilities to test */ 971 mask = BRIDGE_IFCAPS_MASK; 972 973 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 974 /* Every member must support it or its disabled */ 975 mask &= bif->bif_savedcaps; 976 } 977 978 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 979 enabled = bif->bif_ifp->if_capenable; 980 enabled &= ~BRIDGE_IFCAPS_STRIP; 981 /* strip off mask bits and enable them again if allowed */ 982 enabled &= ~BRIDGE_IFCAPS_MASK; 983 enabled |= mask; 984 bridge_set_ifcap(sc, bif, enabled); 985 } 986 } 987 988 static void 989 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 990 { 991 struct ifnet *ifp = bif->bif_ifp; 992 struct ifreq ifr; 993 int error, mask, stuck; 994 995 bzero(&ifr, sizeof(ifr)); 996 ifr.ifr_reqcap = set; 997 998 if (ifp->if_capenable != set) { 999 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1000 if (error) 1001 if_printf(sc->sc_ifp, 1002 "error setting capabilities on %s: %d\n", 1003 ifp->if_xname, error); 1004 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1005 stuck = ifp->if_capenable & mask & ~set; 1006 if (stuck != 0) 1007 if_printf(sc->sc_ifp, 1008 "can't disable some capabilities on %s: 0x%x\n", 1009 ifp->if_xname, stuck); 1010 } 1011 } 1012 1013 /* 1014 * bridge_lookup_member: 1015 * 1016 * Lookup a bridge member interface. 1017 */ 1018 static struct bridge_iflist * 1019 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1020 { 1021 struct bridge_iflist *bif; 1022 struct ifnet *ifp; 1023 1024 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1025 1026 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1027 ifp = bif->bif_ifp; 1028 if (strcmp(ifp->if_xname, name) == 0) 1029 return (bif); 1030 } 1031 1032 return (NULL); 1033 } 1034 1035 /* 1036 * bridge_lookup_member_if: 1037 * 1038 * Lookup a bridge member interface by ifnet*. 1039 */ 1040 static struct bridge_iflist * 1041 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1042 { 1043 struct bridge_iflist *bif; 1044 1045 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1046 1047 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1048 if (bif->bif_ifp == member_ifp) 1049 return (bif); 1050 } 1051 1052 return (NULL); 1053 } 1054 1055 static void 1056 bridge_delete_member_cb(struct epoch_context *ctx) 1057 { 1058 struct bridge_iflist *bif; 1059 1060 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1061 1062 free(bif, M_DEVBUF); 1063 } 1064 1065 /* 1066 * bridge_delete_member: 1067 * 1068 * Delete the specified member interface. 1069 */ 1070 static void 1071 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1072 int gone) 1073 { 1074 struct ifnet *ifs = bif->bif_ifp; 1075 struct ifnet *fif = NULL; 1076 struct bridge_iflist *bifl; 1077 1078 BRIDGE_LOCK_ASSERT(sc); 1079 1080 if (bif->bif_flags & IFBIF_STP) 1081 bstp_disable(&bif->bif_stp); 1082 1083 ifs->if_bridge = NULL; 1084 CK_LIST_REMOVE(bif, bif_next); 1085 1086 /* 1087 * If removing the interface that gave the bridge its mac address, set 1088 * the mac address of the bridge to the address of the next member, or 1089 * to its default address if no members are left. 1090 */ 1091 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1092 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1093 bcopy(&sc->sc_defaddr, 1094 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1095 sc->sc_ifaddr = NULL; 1096 } else { 1097 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1098 fif = bifl->bif_ifp; 1099 bcopy(IF_LLADDR(fif), 1100 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1101 sc->sc_ifaddr = fif; 1102 } 1103 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1104 } 1105 1106 bridge_linkcheck(sc); 1107 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1108 BRIDGE_RT_LOCK(sc); 1109 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1110 BRIDGE_RT_UNLOCK(sc); 1111 KASSERT(bif->bif_addrcnt == 0, 1112 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1113 1114 ifs->if_bridge_output = NULL; 1115 ifs->if_bridge_input = NULL; 1116 ifs->if_bridge_linkstate = NULL; 1117 if (!gone) { 1118 switch (ifs->if_type) { 1119 case IFT_ETHER: 1120 case IFT_L2VLAN: 1121 /* 1122 * Take the interface out of promiscuous mode, but only 1123 * if it was promiscuous in the first place. It might 1124 * not be if we're in the bridge_ioctl_add() error path. 1125 */ 1126 if (ifs->if_flags & IFF_PROMISC) 1127 (void) ifpromisc(ifs, 0); 1128 break; 1129 1130 case IFT_GIF: 1131 break; 1132 1133 default: 1134 #ifdef DIAGNOSTIC 1135 panic("bridge_delete_member: impossible"); 1136 #endif 1137 break; 1138 } 1139 /* reneable any interface capabilities */ 1140 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1141 } 1142 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1143 1144 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1145 } 1146 1147 /* 1148 * bridge_delete_span: 1149 * 1150 * Delete the specified span interface. 1151 */ 1152 static void 1153 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1154 { 1155 BRIDGE_LOCK_ASSERT(sc); 1156 1157 KASSERT(bif->bif_ifp->if_bridge == NULL, 1158 ("%s: not a span interface", __func__)); 1159 1160 CK_LIST_REMOVE(bif, bif_next); 1161 1162 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1163 } 1164 1165 static int 1166 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1167 { 1168 struct ifbreq *req = arg; 1169 struct bridge_iflist *bif = NULL; 1170 struct ifnet *ifs; 1171 int error = 0; 1172 1173 ifs = ifunit(req->ifbr_ifsname); 1174 if (ifs == NULL) 1175 return (ENOENT); 1176 if (ifs->if_ioctl == NULL) /* must be supported */ 1177 return (EINVAL); 1178 1179 /* If it's in the span list, it can't be a member. */ 1180 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1181 if (ifs == bif->bif_ifp) 1182 return (EBUSY); 1183 1184 if (ifs->if_bridge == sc) 1185 return (EEXIST); 1186 1187 if (ifs->if_bridge != NULL) 1188 return (EBUSY); 1189 1190 switch (ifs->if_type) { 1191 case IFT_ETHER: 1192 case IFT_L2VLAN: 1193 case IFT_GIF: 1194 /* permitted interface types */ 1195 break; 1196 default: 1197 return (EINVAL); 1198 } 1199 1200 #ifdef INET6 1201 /* 1202 * Two valid inet6 addresses with link-local scope must not be 1203 * on the parent interface and the member interfaces at the 1204 * same time. This restriction is needed to prevent violation 1205 * of link-local scope zone. Attempts to add a member 1206 * interface which has inet6 addresses when the parent has 1207 * inet6 triggers removal of all inet6 addresses on the member 1208 * interface. 1209 */ 1210 1211 /* Check if the parent interface has a link-local scope addr. */ 1212 if (V_allow_llz_overlap == 0 && 1213 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1214 /* 1215 * If any, remove all inet6 addresses from the member 1216 * interfaces. 1217 */ 1218 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1219 if (in6ifa_llaonifp(bif->bif_ifp)) { 1220 in6_ifdetach(bif->bif_ifp); 1221 if_printf(sc->sc_ifp, 1222 "IPv6 addresses on %s have been removed " 1223 "before adding it as a member to prevent " 1224 "IPv6 address scope violation.\n", 1225 bif->bif_ifp->if_xname); 1226 } 1227 } 1228 if (in6ifa_llaonifp(ifs)) { 1229 in6_ifdetach(ifs); 1230 if_printf(sc->sc_ifp, 1231 "IPv6 addresses on %s have been removed " 1232 "before adding it as a member to prevent " 1233 "IPv6 address scope violation.\n", 1234 ifs->if_xname); 1235 } 1236 } 1237 #endif 1238 /* Allow the first Ethernet member to define the MTU */ 1239 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1240 sc->sc_ifp->if_mtu = ifs->if_mtu; 1241 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1242 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1243 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1244 return (EINVAL); 1245 } 1246 1247 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1248 if (bif == NULL) 1249 return (ENOMEM); 1250 1251 bif->bif_ifp = ifs; 1252 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1253 bif->bif_savedcaps = ifs->if_capenable; 1254 1255 /* 1256 * Assign the interface's MAC address to the bridge if it's the first 1257 * member and the MAC address of the bridge has not been changed from 1258 * the default randomly generated one. 1259 */ 1260 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1261 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1262 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1263 sc->sc_ifaddr = ifs; 1264 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1265 } 1266 1267 ifs->if_bridge = sc; 1268 ifs->if_bridge_output = bridge_output; 1269 ifs->if_bridge_input = bridge_input; 1270 ifs->if_bridge_linkstate = bridge_linkstate; 1271 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1272 /* 1273 * XXX: XLOCK HERE!?! 1274 * 1275 * NOTE: insert_***HEAD*** should be safe for the traversals. 1276 */ 1277 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1278 1279 /* Set interface capabilities to the intersection set of all members */ 1280 bridge_mutecaps(sc); 1281 bridge_linkcheck(sc); 1282 1283 /* Place the interface into promiscuous mode */ 1284 switch (ifs->if_type) { 1285 case IFT_ETHER: 1286 case IFT_L2VLAN: 1287 error = ifpromisc(ifs, 1); 1288 break; 1289 } 1290 1291 if (error) 1292 bridge_delete_member(sc, bif, 0); 1293 return (error); 1294 } 1295 1296 static int 1297 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1298 { 1299 struct ifbreq *req = arg; 1300 struct bridge_iflist *bif; 1301 1302 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1303 if (bif == NULL) 1304 return (ENOENT); 1305 1306 bridge_delete_member(sc, bif, 0); 1307 1308 return (0); 1309 } 1310 1311 static int 1312 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1313 { 1314 struct ifbreq *req = arg; 1315 struct bridge_iflist *bif; 1316 struct bstp_port *bp; 1317 1318 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1319 if (bif == NULL) 1320 return (ENOENT); 1321 1322 bp = &bif->bif_stp; 1323 req->ifbr_ifsflags = bif->bif_flags; 1324 req->ifbr_state = bp->bp_state; 1325 req->ifbr_priority = bp->bp_priority; 1326 req->ifbr_path_cost = bp->bp_path_cost; 1327 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1328 req->ifbr_proto = bp->bp_protover; 1329 req->ifbr_role = bp->bp_role; 1330 req->ifbr_stpflags = bp->bp_flags; 1331 req->ifbr_addrcnt = bif->bif_addrcnt; 1332 req->ifbr_addrmax = bif->bif_addrmax; 1333 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1334 1335 /* Copy STP state options as flags */ 1336 if (bp->bp_operedge) 1337 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1338 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1339 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1340 if (bp->bp_ptp_link) 1341 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1342 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1343 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1344 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1345 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1346 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1347 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1348 return (0); 1349 } 1350 1351 static int 1352 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1353 { 1354 struct epoch_tracker et; 1355 struct ifbreq *req = arg; 1356 struct bridge_iflist *bif; 1357 struct bstp_port *bp; 1358 int error; 1359 1360 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1361 if (bif == NULL) 1362 return (ENOENT); 1363 bp = &bif->bif_stp; 1364 1365 if (req->ifbr_ifsflags & IFBIF_SPAN) 1366 /* SPAN is readonly */ 1367 return (EINVAL); 1368 1369 NET_EPOCH_ENTER(et); 1370 1371 if (req->ifbr_ifsflags & IFBIF_STP) { 1372 if ((bif->bif_flags & IFBIF_STP) == 0) { 1373 error = bstp_enable(&bif->bif_stp); 1374 if (error) { 1375 NET_EPOCH_EXIT(et); 1376 return (error); 1377 } 1378 } 1379 } else { 1380 if ((bif->bif_flags & IFBIF_STP) != 0) 1381 bstp_disable(&bif->bif_stp); 1382 } 1383 1384 /* Pass on STP flags */ 1385 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1386 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1387 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1388 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1389 1390 /* Save the bits relating to the bridge */ 1391 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1392 1393 NET_EPOCH_EXIT(et); 1394 1395 return (0); 1396 } 1397 1398 static int 1399 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1400 { 1401 struct ifbrparam *param = arg; 1402 1403 sc->sc_brtmax = param->ifbrp_csize; 1404 bridge_rttrim(sc); 1405 1406 return (0); 1407 } 1408 1409 static int 1410 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1411 { 1412 struct ifbrparam *param = arg; 1413 1414 param->ifbrp_csize = sc->sc_brtmax; 1415 1416 return (0); 1417 } 1418 1419 static int 1420 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1421 { 1422 struct ifbifconf *bifc = arg; 1423 struct bridge_iflist *bif; 1424 struct ifbreq breq; 1425 char *buf, *outbuf; 1426 int count, buflen, len, error = 0; 1427 1428 count = 0; 1429 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1430 count++; 1431 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1432 count++; 1433 1434 buflen = sizeof(breq) * count; 1435 if (bifc->ifbic_len == 0) { 1436 bifc->ifbic_len = buflen; 1437 return (0); 1438 } 1439 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1440 if (outbuf == NULL) 1441 return (ENOMEM); 1442 1443 count = 0; 1444 buf = outbuf; 1445 len = min(bifc->ifbic_len, buflen); 1446 bzero(&breq, sizeof(breq)); 1447 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1448 if (len < sizeof(breq)) 1449 break; 1450 1451 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1452 sizeof(breq.ifbr_ifsname)); 1453 /* Fill in the ifbreq structure */ 1454 error = bridge_ioctl_gifflags(sc, &breq); 1455 if (error) 1456 break; 1457 memcpy(buf, &breq, sizeof(breq)); 1458 count++; 1459 buf += sizeof(breq); 1460 len -= sizeof(breq); 1461 } 1462 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1463 if (len < sizeof(breq)) 1464 break; 1465 1466 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1467 sizeof(breq.ifbr_ifsname)); 1468 breq.ifbr_ifsflags = bif->bif_flags; 1469 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1470 memcpy(buf, &breq, sizeof(breq)); 1471 count++; 1472 buf += sizeof(breq); 1473 len -= sizeof(breq); 1474 } 1475 1476 bifc->ifbic_len = sizeof(breq) * count; 1477 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1478 free(outbuf, M_TEMP); 1479 return (error); 1480 } 1481 1482 static int 1483 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1484 { 1485 struct ifbaconf *bac = arg; 1486 struct bridge_rtnode *brt; 1487 struct ifbareq bareq; 1488 char *buf, *outbuf; 1489 int count, buflen, len, error = 0; 1490 1491 if (bac->ifbac_len == 0) 1492 return (0); 1493 1494 count = 0; 1495 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1496 count++; 1497 buflen = sizeof(bareq) * count; 1498 1499 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1500 if (outbuf == NULL) 1501 return (ENOMEM); 1502 1503 count = 0; 1504 buf = outbuf; 1505 len = min(bac->ifbac_len, buflen); 1506 bzero(&bareq, sizeof(bareq)); 1507 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1508 if (len < sizeof(bareq)) 1509 goto out; 1510 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1511 sizeof(bareq.ifba_ifsname)); 1512 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1513 bareq.ifba_vlan = brt->brt_vlan; 1514 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1515 time_uptime < brt->brt_expire) 1516 bareq.ifba_expire = brt->brt_expire - time_uptime; 1517 else 1518 bareq.ifba_expire = 0; 1519 bareq.ifba_flags = brt->brt_flags; 1520 1521 memcpy(buf, &bareq, sizeof(bareq)); 1522 count++; 1523 buf += sizeof(bareq); 1524 len -= sizeof(bareq); 1525 } 1526 out: 1527 bac->ifbac_len = sizeof(bareq) * count; 1528 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1529 free(outbuf, M_TEMP); 1530 return (error); 1531 } 1532 1533 static int 1534 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1535 { 1536 struct ifbareq *req = arg; 1537 struct bridge_iflist *bif; 1538 struct epoch_tracker et; 1539 int error; 1540 1541 NET_EPOCH_ENTER(et); 1542 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1543 if (bif == NULL) { 1544 NET_EPOCH_EXIT(et); 1545 return (ENOENT); 1546 } 1547 1548 /* bridge_rtupdate() may acquire the lock. */ 1549 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1550 req->ifba_flags); 1551 NET_EPOCH_EXIT(et); 1552 1553 return (error); 1554 } 1555 1556 static int 1557 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1558 { 1559 struct ifbrparam *param = arg; 1560 1561 sc->sc_brttimeout = param->ifbrp_ctime; 1562 return (0); 1563 } 1564 1565 static int 1566 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1567 { 1568 struct ifbrparam *param = arg; 1569 1570 param->ifbrp_ctime = sc->sc_brttimeout; 1571 return (0); 1572 } 1573 1574 static int 1575 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1576 { 1577 struct ifbareq *req = arg; 1578 1579 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1580 } 1581 1582 static int 1583 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1584 { 1585 struct ifbreq *req = arg; 1586 1587 BRIDGE_RT_LOCK(sc); 1588 bridge_rtflush(sc, req->ifbr_ifsflags); 1589 BRIDGE_RT_UNLOCK(sc); 1590 1591 return (0); 1592 } 1593 1594 static int 1595 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1596 { 1597 struct ifbrparam *param = arg; 1598 struct bstp_state *bs = &sc->sc_stp; 1599 1600 param->ifbrp_prio = bs->bs_bridge_priority; 1601 return (0); 1602 } 1603 1604 static int 1605 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1606 { 1607 struct ifbrparam *param = arg; 1608 1609 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1610 } 1611 1612 static int 1613 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1614 { 1615 struct ifbrparam *param = arg; 1616 struct bstp_state *bs = &sc->sc_stp; 1617 1618 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1619 return (0); 1620 } 1621 1622 static int 1623 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1624 { 1625 struct ifbrparam *param = arg; 1626 1627 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1628 } 1629 1630 static int 1631 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1632 { 1633 struct ifbrparam *param = arg; 1634 struct bstp_state *bs = &sc->sc_stp; 1635 1636 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1637 return (0); 1638 } 1639 1640 static int 1641 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1642 { 1643 struct ifbrparam *param = arg; 1644 1645 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1646 } 1647 1648 static int 1649 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1650 { 1651 struct ifbrparam *param = arg; 1652 struct bstp_state *bs = &sc->sc_stp; 1653 1654 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1655 return (0); 1656 } 1657 1658 static int 1659 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1660 { 1661 struct ifbrparam *param = arg; 1662 1663 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1664 } 1665 1666 static int 1667 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1668 { 1669 struct ifbreq *req = arg; 1670 struct bridge_iflist *bif; 1671 1672 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1673 if (bif == NULL) 1674 return (ENOENT); 1675 1676 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1677 } 1678 1679 static int 1680 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1681 { 1682 struct ifbreq *req = arg; 1683 struct bridge_iflist *bif; 1684 1685 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1686 if (bif == NULL) 1687 return (ENOENT); 1688 1689 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1690 } 1691 1692 static int 1693 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1694 { 1695 struct ifbreq *req = arg; 1696 struct bridge_iflist *bif; 1697 1698 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1699 if (bif == NULL) 1700 return (ENOENT); 1701 1702 bif->bif_addrmax = req->ifbr_addrmax; 1703 return (0); 1704 } 1705 1706 static int 1707 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1708 { 1709 struct ifbreq *req = arg; 1710 struct bridge_iflist *bif = NULL; 1711 struct ifnet *ifs; 1712 1713 ifs = ifunit(req->ifbr_ifsname); 1714 if (ifs == NULL) 1715 return (ENOENT); 1716 1717 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1718 if (ifs == bif->bif_ifp) 1719 return (EBUSY); 1720 1721 if (ifs->if_bridge != NULL) 1722 return (EBUSY); 1723 1724 switch (ifs->if_type) { 1725 case IFT_ETHER: 1726 case IFT_GIF: 1727 case IFT_L2VLAN: 1728 break; 1729 default: 1730 return (EINVAL); 1731 } 1732 1733 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1734 if (bif == NULL) 1735 return (ENOMEM); 1736 1737 bif->bif_ifp = ifs; 1738 bif->bif_flags = IFBIF_SPAN; 1739 1740 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1741 1742 return (0); 1743 } 1744 1745 static int 1746 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1747 { 1748 struct ifbreq *req = arg; 1749 struct bridge_iflist *bif; 1750 struct ifnet *ifs; 1751 1752 ifs = ifunit(req->ifbr_ifsname); 1753 if (ifs == NULL) 1754 return (ENOENT); 1755 1756 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1757 if (ifs == bif->bif_ifp) 1758 break; 1759 1760 if (bif == NULL) 1761 return (ENOENT); 1762 1763 bridge_delete_span(sc, bif); 1764 1765 return (0); 1766 } 1767 1768 static int 1769 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1770 { 1771 struct ifbropreq *req = arg; 1772 struct bstp_state *bs = &sc->sc_stp; 1773 struct bstp_port *root_port; 1774 1775 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1776 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1777 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1778 1779 root_port = bs->bs_root_port; 1780 if (root_port == NULL) 1781 req->ifbop_root_port = 0; 1782 else 1783 req->ifbop_root_port = root_port->bp_ifp->if_index; 1784 1785 req->ifbop_holdcount = bs->bs_txholdcount; 1786 req->ifbop_priority = bs->bs_bridge_priority; 1787 req->ifbop_protocol = bs->bs_protover; 1788 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1789 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1790 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1791 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1792 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1793 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1794 1795 return (0); 1796 } 1797 1798 static int 1799 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1800 { 1801 struct ifbrparam *param = arg; 1802 1803 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1804 return (0); 1805 } 1806 1807 static int 1808 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1809 { 1810 struct ifbpstpconf *bifstp = arg; 1811 struct bridge_iflist *bif; 1812 struct bstp_port *bp; 1813 struct ifbpstpreq bpreq; 1814 char *buf, *outbuf; 1815 int count, buflen, len, error = 0; 1816 1817 count = 0; 1818 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1819 if ((bif->bif_flags & IFBIF_STP) != 0) 1820 count++; 1821 } 1822 1823 buflen = sizeof(bpreq) * count; 1824 if (bifstp->ifbpstp_len == 0) { 1825 bifstp->ifbpstp_len = buflen; 1826 return (0); 1827 } 1828 1829 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1830 if (outbuf == NULL) 1831 return (ENOMEM); 1832 1833 count = 0; 1834 buf = outbuf; 1835 len = min(bifstp->ifbpstp_len, buflen); 1836 bzero(&bpreq, sizeof(bpreq)); 1837 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1838 if (len < sizeof(bpreq)) 1839 break; 1840 1841 if ((bif->bif_flags & IFBIF_STP) == 0) 1842 continue; 1843 1844 bp = &bif->bif_stp; 1845 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1846 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1847 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1848 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1849 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1850 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1851 1852 memcpy(buf, &bpreq, sizeof(bpreq)); 1853 count++; 1854 buf += sizeof(bpreq); 1855 len -= sizeof(bpreq); 1856 } 1857 1858 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1859 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1860 free(outbuf, M_TEMP); 1861 return (error); 1862 } 1863 1864 static int 1865 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1866 { 1867 struct ifbrparam *param = arg; 1868 1869 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1870 } 1871 1872 static int 1873 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1874 { 1875 struct ifbrparam *param = arg; 1876 1877 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1878 } 1879 1880 /* 1881 * bridge_ifdetach: 1882 * 1883 * Detach an interface from a bridge. Called when a member 1884 * interface is detaching. 1885 */ 1886 static void 1887 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1888 { 1889 struct bridge_softc *sc = ifp->if_bridge; 1890 struct bridge_iflist *bif; 1891 1892 if (ifp->if_flags & IFF_RENAMING) 1893 return; 1894 if (V_bridge_cloner == NULL) { 1895 /* 1896 * This detach handler can be called after 1897 * vnet_bridge_uninit(). Just return in that case. 1898 */ 1899 return; 1900 } 1901 /* Check if the interface is a bridge member */ 1902 if (sc != NULL) { 1903 BRIDGE_LOCK(sc); 1904 1905 bif = bridge_lookup_member_if(sc, ifp); 1906 if (bif != NULL) 1907 bridge_delete_member(sc, bif, 1); 1908 1909 BRIDGE_UNLOCK(sc); 1910 return; 1911 } 1912 1913 /* Check if the interface is a span port */ 1914 BRIDGE_LIST_LOCK(); 1915 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1916 BRIDGE_LOCK(sc); 1917 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1918 if (ifp == bif->bif_ifp) { 1919 bridge_delete_span(sc, bif); 1920 break; 1921 } 1922 1923 BRIDGE_UNLOCK(sc); 1924 } 1925 BRIDGE_LIST_UNLOCK(); 1926 } 1927 1928 /* 1929 * bridge_init: 1930 * 1931 * Initialize a bridge interface. 1932 */ 1933 static void 1934 bridge_init(void *xsc) 1935 { 1936 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1937 struct ifnet *ifp = sc->sc_ifp; 1938 1939 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1940 return; 1941 1942 BRIDGE_LOCK(sc); 1943 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1944 bridge_timer, sc); 1945 1946 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1947 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1948 1949 BRIDGE_UNLOCK(sc); 1950 } 1951 1952 /* 1953 * bridge_stop: 1954 * 1955 * Stop the bridge interface. 1956 */ 1957 static void 1958 bridge_stop(struct ifnet *ifp, int disable) 1959 { 1960 struct bridge_softc *sc = ifp->if_softc; 1961 1962 BRIDGE_LOCK_ASSERT(sc); 1963 1964 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1965 return; 1966 1967 BRIDGE_RT_LOCK(sc); 1968 callout_stop(&sc->sc_brcallout); 1969 1970 bstp_stop(&sc->sc_stp); 1971 1972 bridge_rtflush(sc, IFBF_FLUSHDYN); 1973 BRIDGE_RT_UNLOCK(sc); 1974 1975 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1976 } 1977 1978 /* 1979 * bridge_enqueue: 1980 * 1981 * Enqueue a packet on a bridge member interface. 1982 * 1983 */ 1984 static int 1985 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1986 { 1987 int len, err = 0; 1988 short mflags; 1989 struct mbuf *m0; 1990 1991 /* We may be sending a fragment so traverse the mbuf */ 1992 for (; m; m = m0) { 1993 m0 = m->m_nextpkt; 1994 m->m_nextpkt = NULL; 1995 len = m->m_pkthdr.len; 1996 mflags = m->m_flags; 1997 1998 /* 1999 * If underlying interface can not do VLAN tag insertion itself 2000 * then attach a packet tag that holds it. 2001 */ 2002 if ((m->m_flags & M_VLANTAG) && 2003 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2004 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2005 if (m == NULL) { 2006 if_printf(dst_ifp, 2007 "unable to prepend VLAN header\n"); 2008 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2009 continue; 2010 } 2011 m->m_flags &= ~M_VLANTAG; 2012 } 2013 2014 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2015 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2016 m_freem(m0); 2017 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2018 break; 2019 } 2020 2021 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2022 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2023 if (mflags & M_MCAST) 2024 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2025 } 2026 2027 return (err); 2028 } 2029 2030 /* 2031 * bridge_dummynet: 2032 * 2033 * Receive a queued packet from dummynet and pass it on to the output 2034 * interface. 2035 * 2036 * The mbuf has the Ethernet header already attached. 2037 */ 2038 static void 2039 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2040 { 2041 struct bridge_softc *sc; 2042 2043 sc = ifp->if_bridge; 2044 2045 /* 2046 * The packet didnt originate from a member interface. This should only 2047 * ever happen if a member interface is removed while packets are 2048 * queued for it. 2049 */ 2050 if (sc == NULL) { 2051 m_freem(m); 2052 return; 2053 } 2054 2055 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2056 #ifdef INET6 2057 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2058 #endif 2059 ) { 2060 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2061 return; 2062 if (m == NULL) 2063 return; 2064 } 2065 2066 bridge_enqueue(sc, ifp, m); 2067 } 2068 2069 /* 2070 * bridge_output: 2071 * 2072 * Send output from a bridge member interface. This 2073 * performs the bridging function for locally originated 2074 * packets. 2075 * 2076 * The mbuf has the Ethernet header already attached. We must 2077 * enqueue or free the mbuf before returning. 2078 */ 2079 static int 2080 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2081 struct rtentry *rt) 2082 { 2083 struct ether_header *eh; 2084 struct ifnet *bifp, *dst_if; 2085 struct bridge_softc *sc; 2086 uint16_t vlan; 2087 2088 NET_EPOCH_ASSERT(); 2089 2090 if (m->m_len < ETHER_HDR_LEN) { 2091 m = m_pullup(m, ETHER_HDR_LEN); 2092 if (m == NULL) 2093 return (0); 2094 } 2095 2096 eh = mtod(m, struct ether_header *); 2097 sc = ifp->if_bridge; 2098 vlan = VLANTAGOF(m); 2099 2100 bifp = sc->sc_ifp; 2101 2102 /* 2103 * If bridge is down, but the original output interface is up, 2104 * go ahead and send out that interface. Otherwise, the packet 2105 * is dropped below. 2106 */ 2107 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2108 dst_if = ifp; 2109 goto sendunicast; 2110 } 2111 2112 /* 2113 * If the packet is a multicast, or we don't know a better way to 2114 * get there, send to all interfaces. 2115 */ 2116 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2117 dst_if = NULL; 2118 else 2119 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2120 /* Tap any traffic not passing back out the originating interface */ 2121 if (dst_if != ifp) 2122 ETHER_BPF_MTAP(bifp, m); 2123 if (dst_if == NULL) { 2124 struct bridge_iflist *bif; 2125 struct mbuf *mc; 2126 int used = 0; 2127 2128 bridge_span(sc, m); 2129 2130 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2131 dst_if = bif->bif_ifp; 2132 2133 if (dst_if->if_type == IFT_GIF) 2134 continue; 2135 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2136 continue; 2137 2138 /* 2139 * If this is not the original output interface, 2140 * and the interface is participating in spanning 2141 * tree, make sure the port is in a state that 2142 * allows forwarding. 2143 */ 2144 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2145 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2146 continue; 2147 2148 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2149 used = 1; 2150 mc = m; 2151 } else { 2152 mc = m_copypacket(m, M_NOWAIT); 2153 if (mc == NULL) { 2154 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2155 continue; 2156 } 2157 } 2158 2159 bridge_enqueue(sc, dst_if, mc); 2160 } 2161 if (used == 0) 2162 m_freem(m); 2163 return (0); 2164 } 2165 2166 sendunicast: 2167 /* 2168 * XXX Spanning tree consideration here? 2169 */ 2170 2171 bridge_span(sc, m); 2172 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2173 m_freem(m); 2174 return (0); 2175 } 2176 2177 bridge_enqueue(sc, dst_if, m); 2178 return (0); 2179 } 2180 2181 /* 2182 * bridge_transmit: 2183 * 2184 * Do output on a bridge. 2185 * 2186 */ 2187 static int 2188 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2189 { 2190 struct bridge_softc *sc; 2191 struct ether_header *eh; 2192 struct ifnet *dst_if; 2193 int error = 0; 2194 2195 sc = ifp->if_softc; 2196 2197 ETHER_BPF_MTAP(ifp, m); 2198 2199 eh = mtod(m, struct ether_header *); 2200 2201 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2202 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2203 error = bridge_enqueue(sc, dst_if, m); 2204 } else 2205 bridge_broadcast(sc, ifp, m, 0); 2206 2207 return (error); 2208 } 2209 2210 /* 2211 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2212 */ 2213 static void 2214 bridge_qflush(struct ifnet *ifp __unused) 2215 { 2216 } 2217 2218 /* 2219 * bridge_forward: 2220 * 2221 * The forwarding function of the bridge. 2222 * 2223 * NOTE: Releases the lock on return. 2224 */ 2225 static void 2226 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2227 struct mbuf *m) 2228 { 2229 struct bridge_iflist *dbif; 2230 struct ifnet *src_if, *dst_if, *ifp; 2231 struct ether_header *eh; 2232 uint16_t vlan; 2233 uint8_t *dst; 2234 int error; 2235 2236 NET_EPOCH_ASSERT(); 2237 2238 src_if = m->m_pkthdr.rcvif; 2239 ifp = sc->sc_ifp; 2240 2241 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2242 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2243 vlan = VLANTAGOF(m); 2244 2245 if ((sbif->bif_flags & IFBIF_STP) && 2246 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2247 goto drop; 2248 2249 eh = mtod(m, struct ether_header *); 2250 dst = eh->ether_dhost; 2251 2252 /* If the interface is learning, record the address. */ 2253 if (sbif->bif_flags & IFBIF_LEARNING) { 2254 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2255 sbif, 0, IFBAF_DYNAMIC); 2256 /* 2257 * If the interface has addresses limits then deny any source 2258 * that is not in the cache. 2259 */ 2260 if (error && sbif->bif_addrmax) 2261 goto drop; 2262 } 2263 2264 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2265 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2266 goto drop; 2267 2268 /* 2269 * At this point, the port either doesn't participate 2270 * in spanning tree or it is in the forwarding state. 2271 */ 2272 2273 /* 2274 * If the packet is unicast, destined for someone on 2275 * "this" side of the bridge, drop it. 2276 */ 2277 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2278 dst_if = bridge_rtlookup(sc, dst, vlan); 2279 if (src_if == dst_if) 2280 goto drop; 2281 } else { 2282 /* 2283 * Check if its a reserved multicast address, any address 2284 * listed in 802.1D section 7.12.6 may not be forwarded by the 2285 * bridge. 2286 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2287 */ 2288 if (dst[0] == 0x01 && dst[1] == 0x80 && 2289 dst[2] == 0xc2 && dst[3] == 0x00 && 2290 dst[4] == 0x00 && dst[5] <= 0x0f) 2291 goto drop; 2292 2293 /* ...forward it to all interfaces. */ 2294 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2295 dst_if = NULL; 2296 } 2297 2298 /* 2299 * If we have a destination interface which is a member of our bridge, 2300 * OR this is a unicast packet, push it through the bpf(4) machinery. 2301 * For broadcast or multicast packets, don't bother because it will 2302 * be reinjected into ether_input. We do this before we pass the packets 2303 * through the pfil(9) framework, as it is possible that pfil(9) will 2304 * drop the packet, or possibly modify it, making it difficult to debug 2305 * firewall issues on the bridge. 2306 */ 2307 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2308 ETHER_BPF_MTAP(ifp, m); 2309 2310 /* run the packet filter */ 2311 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2312 #ifdef INET6 2313 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2314 #endif 2315 ) { 2316 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2317 return; 2318 if (m == NULL) 2319 return; 2320 } 2321 2322 if (dst_if == NULL) { 2323 bridge_broadcast(sc, src_if, m, 1); 2324 return; 2325 } 2326 2327 /* 2328 * At this point, we're dealing with a unicast frame 2329 * going to a different interface. 2330 */ 2331 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2332 goto drop; 2333 2334 dbif = bridge_lookup_member_if(sc, dst_if); 2335 if (dbif == NULL) 2336 /* Not a member of the bridge (anymore?) */ 2337 goto drop; 2338 2339 /* Private segments can not talk to each other */ 2340 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2341 goto drop; 2342 2343 if ((dbif->bif_flags & IFBIF_STP) && 2344 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2345 goto drop; 2346 2347 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2348 #ifdef INET6 2349 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2350 #endif 2351 ) { 2352 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2353 return; 2354 if (m == NULL) 2355 return; 2356 } 2357 2358 bridge_enqueue(sc, dst_if, m); 2359 return; 2360 2361 drop: 2362 m_freem(m); 2363 } 2364 2365 /* 2366 * bridge_input: 2367 * 2368 * Receive input from a member interface. Queue the packet for 2369 * bridging if it is not for us. 2370 */ 2371 static struct mbuf * 2372 bridge_input(struct ifnet *ifp, struct mbuf *m) 2373 { 2374 struct bridge_softc *sc = ifp->if_bridge; 2375 struct bridge_iflist *bif, *bif2; 2376 struct ifnet *bifp; 2377 struct ether_header *eh; 2378 struct mbuf *mc, *mc2; 2379 uint16_t vlan; 2380 int error; 2381 2382 NET_EPOCH_ASSERT(); 2383 2384 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2385 return (m); 2386 2387 bifp = sc->sc_ifp; 2388 vlan = VLANTAGOF(m); 2389 2390 /* 2391 * Implement support for bridge monitoring. If this flag has been 2392 * set on this interface, discard the packet once we push it through 2393 * the bpf(4) machinery, but before we do, increment the byte and 2394 * packet counters associated with this interface. 2395 */ 2396 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2397 m->m_pkthdr.rcvif = bifp; 2398 ETHER_BPF_MTAP(bifp, m); 2399 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2400 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2401 m_freem(m); 2402 return (NULL); 2403 } 2404 bif = bridge_lookup_member_if(sc, ifp); 2405 if (bif == NULL) { 2406 return (m); 2407 } 2408 2409 eh = mtod(m, struct ether_header *); 2410 2411 bridge_span(sc, m); 2412 2413 if (m->m_flags & (M_BCAST|M_MCAST)) { 2414 /* Tap off 802.1D packets; they do not get forwarded. */ 2415 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2416 ETHER_ADDR_LEN) == 0) { 2417 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2418 return (NULL); 2419 } 2420 2421 if ((bif->bif_flags & IFBIF_STP) && 2422 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2423 return (m); 2424 } 2425 2426 /* 2427 * Make a deep copy of the packet and enqueue the copy 2428 * for bridge processing; return the original packet for 2429 * local processing. 2430 */ 2431 mc = m_dup(m, M_NOWAIT); 2432 if (mc == NULL) { 2433 return (m); 2434 } 2435 2436 /* Perform the bridge forwarding function with the copy. */ 2437 bridge_forward(sc, bif, mc); 2438 2439 /* 2440 * Reinject the mbuf as arriving on the bridge so we have a 2441 * chance at claiming multicast packets. We can not loop back 2442 * here from ether_input as a bridge is never a member of a 2443 * bridge. 2444 */ 2445 KASSERT(bifp->if_bridge == NULL, 2446 ("loop created in bridge_input")); 2447 mc2 = m_dup(m, M_NOWAIT); 2448 if (mc2 != NULL) { 2449 /* Keep the layer3 header aligned */ 2450 int i = min(mc2->m_pkthdr.len, max_protohdr); 2451 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2452 } 2453 if (mc2 != NULL) { 2454 mc2->m_pkthdr.rcvif = bifp; 2455 (*bifp->if_input)(bifp, mc2); 2456 } 2457 2458 /* Return the original packet for local processing. */ 2459 return (m); 2460 } 2461 2462 if ((bif->bif_flags & IFBIF_STP) && 2463 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2464 return (m); 2465 } 2466 2467 #if (defined(INET) || defined(INET6)) 2468 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2469 || ((iface)->if_carp \ 2470 && (*carp_forus_p)((iface), eh->ether_dhost)) 2471 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2472 || ((iface)->if_carp \ 2473 && (*carp_forus_p)((iface), eh->ether_shost)) 2474 #else 2475 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2476 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2477 #endif 2478 2479 #ifdef INET6 2480 # define OR_PFIL_HOOKED_INET6 \ 2481 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2482 #else 2483 # define OR_PFIL_HOOKED_INET6 2484 #endif 2485 2486 #define GRAB_OUR_PACKETS(iface) \ 2487 if ((iface)->if_type == IFT_GIF) \ 2488 continue; \ 2489 /* It is destined for us. */ \ 2490 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2491 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2492 ) { \ 2493 if (bif->bif_flags & IFBIF_LEARNING) { \ 2494 error = bridge_rtupdate(sc, eh->ether_shost, \ 2495 vlan, bif, 0, IFBAF_DYNAMIC); \ 2496 if (error && bif->bif_addrmax) { \ 2497 m_freem(m); \ 2498 return (NULL); \ 2499 } \ 2500 } \ 2501 m->m_pkthdr.rcvif = iface; \ 2502 if ((iface) == ifp) { \ 2503 /* Skip bridge processing... src == dest */ \ 2504 return (m); \ 2505 } \ 2506 /* It's passing over or to the bridge, locally. */ \ 2507 ETHER_BPF_MTAP(bifp, m); \ 2508 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2509 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2510 /* Filter on the physical interface. */ \ 2511 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \ 2512 OR_PFIL_HOOKED_INET6)) { \ 2513 if (bridge_pfil(&m, NULL, ifp, \ 2514 PFIL_IN) != 0 || m == NULL) { \ 2515 return (NULL); \ 2516 } \ 2517 } \ 2518 if ((iface) != bifp) \ 2519 ETHER_BPF_MTAP(iface, m); \ 2520 return (m); \ 2521 } \ 2522 \ 2523 /* We just received a packet that we sent out. */ \ 2524 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2525 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2526 ) { \ 2527 m_freem(m); \ 2528 return (NULL); \ 2529 } 2530 2531 /* 2532 * Unicast. Make sure it's not for the bridge. 2533 */ 2534 do { GRAB_OUR_PACKETS(bifp) } while (0); 2535 2536 /* 2537 * Give a chance for ifp at first priority. This will help when the 2538 * packet comes through the interface like VLAN's with the same MACs 2539 * on several interfaces from the same bridge. This also will save 2540 * some CPU cycles in case the destination interface and the input 2541 * interface (eq ifp) are the same. 2542 */ 2543 do { GRAB_OUR_PACKETS(ifp) } while (0); 2544 2545 /* Now check the all bridge members. */ 2546 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2547 GRAB_OUR_PACKETS(bif2->bif_ifp) 2548 } 2549 2550 #undef OR_CARP_CHECK_WE_ARE_DST 2551 #undef OR_CARP_CHECK_WE_ARE_SRC 2552 #undef OR_PFIL_HOOKED_INET6 2553 #undef GRAB_OUR_PACKETS 2554 2555 /* Perform the bridge forwarding function. */ 2556 bridge_forward(sc, bif, m); 2557 2558 return (NULL); 2559 } 2560 2561 /* 2562 * bridge_broadcast: 2563 * 2564 * Send a frame to all interfaces that are members of 2565 * the bridge, except for the one on which the packet 2566 * arrived. 2567 * 2568 * NOTE: Releases the lock on return. 2569 */ 2570 static void 2571 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2572 struct mbuf *m, int runfilt) 2573 { 2574 struct bridge_iflist *dbif, *sbif; 2575 struct mbuf *mc; 2576 struct ifnet *dst_if; 2577 int used = 0, i; 2578 2579 NET_EPOCH_ASSERT(); 2580 2581 sbif = bridge_lookup_member_if(sc, src_if); 2582 2583 /* Filter on the bridge interface before broadcasting */ 2584 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2585 #ifdef INET6 2586 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2587 #endif 2588 )) { 2589 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2590 return; 2591 if (m == NULL) 2592 return; 2593 } 2594 2595 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2596 dst_if = dbif->bif_ifp; 2597 if (dst_if == src_if) 2598 continue; 2599 2600 /* Private segments can not talk to each other */ 2601 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2602 continue; 2603 2604 if ((dbif->bif_flags & IFBIF_STP) && 2605 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2606 continue; 2607 2608 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2609 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2610 continue; 2611 2612 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2613 continue; 2614 2615 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2616 mc = m; 2617 used = 1; 2618 } else { 2619 mc = m_dup(m, M_NOWAIT); 2620 if (mc == NULL) { 2621 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2622 continue; 2623 } 2624 } 2625 2626 /* 2627 * Filter on the output interface. Pass a NULL bridge interface 2628 * pointer so we do not redundantly filter on the bridge for 2629 * each interface we broadcast on. 2630 */ 2631 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2632 #ifdef INET6 2633 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2634 #endif 2635 )) { 2636 if (used == 0) { 2637 /* Keep the layer3 header aligned */ 2638 i = min(mc->m_pkthdr.len, max_protohdr); 2639 mc = m_copyup(mc, i, ETHER_ALIGN); 2640 if (mc == NULL) { 2641 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2642 continue; 2643 } 2644 } 2645 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2646 continue; 2647 if (mc == NULL) 2648 continue; 2649 } 2650 2651 bridge_enqueue(sc, dst_if, mc); 2652 } 2653 if (used == 0) 2654 m_freem(m); 2655 } 2656 2657 /* 2658 * bridge_span: 2659 * 2660 * Duplicate a packet out one or more interfaces that are in span mode, 2661 * the original mbuf is unmodified. 2662 */ 2663 static void 2664 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2665 { 2666 struct bridge_iflist *bif; 2667 struct ifnet *dst_if; 2668 struct mbuf *mc; 2669 2670 NET_EPOCH_ASSERT(); 2671 2672 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2673 return; 2674 2675 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2676 dst_if = bif->bif_ifp; 2677 2678 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2679 continue; 2680 2681 mc = m_copypacket(m, M_NOWAIT); 2682 if (mc == NULL) { 2683 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2684 continue; 2685 } 2686 2687 bridge_enqueue(sc, dst_if, mc); 2688 } 2689 } 2690 2691 /* 2692 * bridge_rtupdate: 2693 * 2694 * Add a bridge routing entry. 2695 */ 2696 static int 2697 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2698 struct bridge_iflist *bif, int setflags, uint8_t flags) 2699 { 2700 struct bridge_rtnode *brt; 2701 int error; 2702 2703 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2704 2705 /* Check the source address is valid and not multicast. */ 2706 if (ETHER_IS_MULTICAST(dst) || 2707 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2708 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2709 return (EINVAL); 2710 2711 /* 802.1p frames map to vlan 1 */ 2712 if (vlan == 0) 2713 vlan = 1; 2714 2715 /* 2716 * A route for this destination might already exist. If so, 2717 * update it, otherwise create a new one. 2718 */ 2719 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2720 BRIDGE_RT_LOCK(sc); 2721 2722 /* Check again, now that we have the lock. There could have 2723 * been a race and we only want to insert this once. */ 2724 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) { 2725 BRIDGE_RT_UNLOCK(sc); 2726 return (0); 2727 } 2728 2729 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2730 sc->sc_brtexceeded++; 2731 BRIDGE_RT_UNLOCK(sc); 2732 return (ENOSPC); 2733 } 2734 /* Check per interface address limits (if enabled) */ 2735 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2736 bif->bif_addrexceeded++; 2737 BRIDGE_RT_UNLOCK(sc); 2738 return (ENOSPC); 2739 } 2740 2741 /* 2742 * Allocate a new bridge forwarding node, and 2743 * initialize the expiration time and Ethernet 2744 * address. 2745 */ 2746 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2747 if (brt == NULL) { 2748 BRIDGE_RT_UNLOCK(sc); 2749 return (ENOMEM); 2750 } 2751 brt->brt_vnet = curvnet; 2752 2753 if (bif->bif_flags & IFBIF_STICKY) 2754 brt->brt_flags = IFBAF_STICKY; 2755 else 2756 brt->brt_flags = IFBAF_DYNAMIC; 2757 2758 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2759 brt->brt_vlan = vlan; 2760 2761 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2762 uma_zfree(V_bridge_rtnode_zone, brt); 2763 BRIDGE_RT_UNLOCK(sc); 2764 return (error); 2765 } 2766 brt->brt_dst = bif; 2767 bif->bif_addrcnt++; 2768 2769 BRIDGE_RT_UNLOCK(sc); 2770 } 2771 2772 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2773 brt->brt_dst != bif) { 2774 BRIDGE_RT_LOCK(sc); 2775 brt->brt_dst->bif_addrcnt--; 2776 brt->brt_dst = bif; 2777 brt->brt_dst->bif_addrcnt++; 2778 BRIDGE_RT_UNLOCK(sc); 2779 } 2780 2781 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2782 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2783 if (setflags) 2784 brt->brt_flags = flags; 2785 2786 return (0); 2787 } 2788 2789 /* 2790 * bridge_rtlookup: 2791 * 2792 * Lookup the destination interface for an address. 2793 */ 2794 static struct ifnet * 2795 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2796 { 2797 struct bridge_rtnode *brt; 2798 2799 NET_EPOCH_ASSERT(); 2800 2801 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2802 return (NULL); 2803 2804 return (brt->brt_ifp); 2805 } 2806 2807 /* 2808 * bridge_rttrim: 2809 * 2810 * Trim the routine table so that we have a number 2811 * of routing entries less than or equal to the 2812 * maximum number. 2813 */ 2814 static void 2815 bridge_rttrim(struct bridge_softc *sc) 2816 { 2817 struct bridge_rtnode *brt, *nbrt; 2818 2819 NET_EPOCH_ASSERT(); 2820 BRIDGE_RT_LOCK_ASSERT(sc); 2821 2822 /* Make sure we actually need to do this. */ 2823 if (sc->sc_brtcnt <= sc->sc_brtmax) 2824 return; 2825 2826 /* Force an aging cycle; this might trim enough addresses. */ 2827 bridge_rtage(sc); 2828 if (sc->sc_brtcnt <= sc->sc_brtmax) 2829 return; 2830 2831 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2832 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2833 bridge_rtnode_destroy(sc, brt); 2834 if (sc->sc_brtcnt <= sc->sc_brtmax) 2835 return; 2836 } 2837 } 2838 } 2839 2840 /* 2841 * bridge_timer: 2842 * 2843 * Aging timer for the bridge. 2844 */ 2845 static void 2846 bridge_timer(void *arg) 2847 { 2848 struct bridge_softc *sc = arg; 2849 2850 BRIDGE_RT_LOCK_ASSERT(sc); 2851 2852 /* Destruction of rtnodes requires a proper vnet context */ 2853 CURVNET_SET(sc->sc_ifp->if_vnet); 2854 bridge_rtage(sc); 2855 2856 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2857 callout_reset(&sc->sc_brcallout, 2858 bridge_rtable_prune_period * hz, bridge_timer, sc); 2859 CURVNET_RESTORE(); 2860 } 2861 2862 /* 2863 * bridge_rtage: 2864 * 2865 * Perform an aging cycle. 2866 */ 2867 static void 2868 bridge_rtage(struct bridge_softc *sc) 2869 { 2870 struct bridge_rtnode *brt, *nbrt; 2871 2872 BRIDGE_RT_LOCK_ASSERT(sc); 2873 2874 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2875 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2876 if (time_uptime >= brt->brt_expire) 2877 bridge_rtnode_destroy(sc, brt); 2878 } 2879 } 2880 } 2881 2882 /* 2883 * bridge_rtflush: 2884 * 2885 * Remove all dynamic addresses from the bridge. 2886 */ 2887 static void 2888 bridge_rtflush(struct bridge_softc *sc, int full) 2889 { 2890 struct bridge_rtnode *brt, *nbrt; 2891 2892 BRIDGE_RT_LOCK_ASSERT(sc); 2893 2894 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2895 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2896 bridge_rtnode_destroy(sc, brt); 2897 } 2898 } 2899 2900 /* 2901 * bridge_rtdaddr: 2902 * 2903 * Remove an address from the table. 2904 */ 2905 static int 2906 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2907 { 2908 struct bridge_rtnode *brt; 2909 int found = 0; 2910 2911 BRIDGE_RT_LOCK(sc); 2912 2913 /* 2914 * If vlan is zero then we want to delete for all vlans so the lookup 2915 * may return more than one. 2916 */ 2917 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2918 bridge_rtnode_destroy(sc, brt); 2919 found = 1; 2920 } 2921 2922 BRIDGE_RT_UNLOCK(sc); 2923 2924 return (found ? 0 : ENOENT); 2925 } 2926 2927 /* 2928 * bridge_rtdelete: 2929 * 2930 * Delete routes to a speicifc member interface. 2931 */ 2932 static void 2933 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2934 { 2935 struct bridge_rtnode *brt, *nbrt; 2936 2937 BRIDGE_RT_LOCK_ASSERT(sc); 2938 2939 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2940 if (brt->brt_ifp == ifp && (full || 2941 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2942 bridge_rtnode_destroy(sc, brt); 2943 } 2944 } 2945 2946 /* 2947 * bridge_rtable_init: 2948 * 2949 * Initialize the route table for this bridge. 2950 */ 2951 static void 2952 bridge_rtable_init(struct bridge_softc *sc) 2953 { 2954 int i; 2955 2956 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2957 M_DEVBUF, M_WAITOK); 2958 2959 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2960 CK_LIST_INIT(&sc->sc_rthash[i]); 2961 2962 sc->sc_rthash_key = arc4random(); 2963 CK_LIST_INIT(&sc->sc_rtlist); 2964 } 2965 2966 /* 2967 * bridge_rtable_fini: 2968 * 2969 * Deconstruct the route table for this bridge. 2970 */ 2971 static void 2972 bridge_rtable_fini(struct bridge_softc *sc) 2973 { 2974 2975 KASSERT(sc->sc_brtcnt == 0, 2976 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2977 free(sc->sc_rthash, M_DEVBUF); 2978 } 2979 2980 /* 2981 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2982 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2983 */ 2984 #define mix(a, b, c) \ 2985 do { \ 2986 a -= b; a -= c; a ^= (c >> 13); \ 2987 b -= c; b -= a; b ^= (a << 8); \ 2988 c -= a; c -= b; c ^= (b >> 13); \ 2989 a -= b; a -= c; a ^= (c >> 12); \ 2990 b -= c; b -= a; b ^= (a << 16); \ 2991 c -= a; c -= b; c ^= (b >> 5); \ 2992 a -= b; a -= c; a ^= (c >> 3); \ 2993 b -= c; b -= a; b ^= (a << 10); \ 2994 c -= a; c -= b; c ^= (b >> 15); \ 2995 } while (/*CONSTCOND*/0) 2996 2997 static __inline uint32_t 2998 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2999 { 3000 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3001 3002 b += addr[5] << 8; 3003 b += addr[4]; 3004 a += addr[3] << 24; 3005 a += addr[2] << 16; 3006 a += addr[1] << 8; 3007 a += addr[0]; 3008 3009 mix(a, b, c); 3010 3011 return (c & BRIDGE_RTHASH_MASK); 3012 } 3013 3014 #undef mix 3015 3016 static int 3017 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3018 { 3019 int i, d; 3020 3021 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3022 d = ((int)a[i]) - ((int)b[i]); 3023 } 3024 3025 return (d); 3026 } 3027 3028 /* 3029 * bridge_rtnode_lookup: 3030 * 3031 * Look up a bridge route node for the specified destination. Compare the 3032 * vlan id or if zero then just return the first match. 3033 */ 3034 static struct bridge_rtnode * 3035 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3036 { 3037 struct bridge_rtnode *brt; 3038 uint32_t hash; 3039 int dir; 3040 3041 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3042 3043 hash = bridge_rthash(sc, addr); 3044 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3045 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3046 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3047 return (brt); 3048 if (dir > 0) 3049 return (NULL); 3050 } 3051 3052 return (NULL); 3053 } 3054 3055 /* 3056 * bridge_rtnode_insert: 3057 * 3058 * Insert the specified bridge node into the route table. We 3059 * assume the entry is not already in the table. 3060 */ 3061 static int 3062 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3063 { 3064 struct bridge_rtnode *lbrt; 3065 uint32_t hash; 3066 int dir; 3067 3068 BRIDGE_RT_LOCK_ASSERT(sc); 3069 3070 hash = bridge_rthash(sc, brt->brt_addr); 3071 3072 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3073 if (lbrt == NULL) { 3074 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3075 goto out; 3076 } 3077 3078 do { 3079 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3080 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3081 return (EEXIST); 3082 if (dir > 0) { 3083 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3084 goto out; 3085 } 3086 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3087 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3088 goto out; 3089 } 3090 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3091 } while (lbrt != NULL); 3092 3093 #ifdef DIAGNOSTIC 3094 panic("bridge_rtnode_insert: impossible"); 3095 #endif 3096 3097 out: 3098 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3099 sc->sc_brtcnt++; 3100 3101 return (0); 3102 } 3103 3104 static void 3105 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3106 { 3107 struct bridge_rtnode *brt; 3108 3109 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3110 3111 CURVNET_SET(brt->brt_vnet); 3112 uma_zfree(V_bridge_rtnode_zone, brt); 3113 CURVNET_RESTORE(); 3114 } 3115 3116 /* 3117 * bridge_rtnode_destroy: 3118 * 3119 * Destroy a bridge rtnode. 3120 */ 3121 static void 3122 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3123 { 3124 BRIDGE_RT_LOCK_ASSERT(sc); 3125 3126 CK_LIST_REMOVE(brt, brt_hash); 3127 3128 CK_LIST_REMOVE(brt, brt_list); 3129 sc->sc_brtcnt--; 3130 brt->brt_dst->bif_addrcnt--; 3131 3132 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3133 } 3134 3135 /* 3136 * bridge_rtable_expire: 3137 * 3138 * Set the expiry time for all routes on an interface. 3139 */ 3140 static void 3141 bridge_rtable_expire(struct ifnet *ifp, int age) 3142 { 3143 struct bridge_softc *sc = ifp->if_bridge; 3144 struct bridge_rtnode *brt; 3145 3146 CURVNET_SET(ifp->if_vnet); 3147 BRIDGE_RT_LOCK(sc); 3148 3149 /* 3150 * If the age is zero then flush, otherwise set all the expiry times to 3151 * age for the interface 3152 */ 3153 if (age == 0) 3154 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3155 else { 3156 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3157 /* Cap the expiry time to 'age' */ 3158 if (brt->brt_ifp == ifp && 3159 brt->brt_expire > time_uptime + age && 3160 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3161 brt->brt_expire = time_uptime + age; 3162 } 3163 } 3164 BRIDGE_RT_UNLOCK(sc); 3165 CURVNET_RESTORE(); 3166 } 3167 3168 /* 3169 * bridge_state_change: 3170 * 3171 * Callback from the bridgestp code when a port changes states. 3172 */ 3173 static void 3174 bridge_state_change(struct ifnet *ifp, int state) 3175 { 3176 struct bridge_softc *sc = ifp->if_bridge; 3177 static const char *stpstates[] = { 3178 "disabled", 3179 "listening", 3180 "learning", 3181 "forwarding", 3182 "blocking", 3183 "discarding" 3184 }; 3185 3186 CURVNET_SET(ifp->if_vnet); 3187 if (V_log_stp) 3188 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3189 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3190 CURVNET_RESTORE(); 3191 } 3192 3193 /* 3194 * Send bridge packets through pfil if they are one of the types pfil can deal 3195 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3196 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3197 * that interface. 3198 */ 3199 static int 3200 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3201 { 3202 int snap, error, i, hlen; 3203 struct ether_header *eh1, eh2; 3204 struct ip *ip; 3205 struct llc llc1; 3206 u_int16_t ether_type; 3207 pfil_return_t rv; 3208 3209 snap = 0; 3210 error = -1; /* Default error if not error == 0 */ 3211 3212 #if 0 3213 /* we may return with the IP fields swapped, ensure its not shared */ 3214 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3215 #endif 3216 3217 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3218 return (0); /* filtering is disabled */ 3219 3220 i = min((*mp)->m_pkthdr.len, max_protohdr); 3221 if ((*mp)->m_len < i) { 3222 *mp = m_pullup(*mp, i); 3223 if (*mp == NULL) { 3224 printf("%s: m_pullup failed\n", __func__); 3225 return (-1); 3226 } 3227 } 3228 3229 eh1 = mtod(*mp, struct ether_header *); 3230 ether_type = ntohs(eh1->ether_type); 3231 3232 /* 3233 * Check for SNAP/LLC. 3234 */ 3235 if (ether_type < ETHERMTU) { 3236 struct llc *llc2 = (struct llc *)(eh1 + 1); 3237 3238 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3239 llc2->llc_dsap == LLC_SNAP_LSAP && 3240 llc2->llc_ssap == LLC_SNAP_LSAP && 3241 llc2->llc_control == LLC_UI) { 3242 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3243 snap = 1; 3244 } 3245 } 3246 3247 /* 3248 * If we're trying to filter bridge traffic, don't look at anything 3249 * other than IP and ARP traffic. If the filter doesn't understand 3250 * IPv6, don't allow IPv6 through the bridge either. This is lame 3251 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3252 * but of course we don't have an AppleTalk filter to begin with. 3253 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3254 * ARP traffic.) 3255 */ 3256 switch (ether_type) { 3257 case ETHERTYPE_ARP: 3258 case ETHERTYPE_REVARP: 3259 if (V_pfil_ipfw_arp == 0) 3260 return (0); /* Automatically pass */ 3261 break; 3262 3263 case ETHERTYPE_IP: 3264 #ifdef INET6 3265 case ETHERTYPE_IPV6: 3266 #endif /* INET6 */ 3267 break; 3268 default: 3269 /* 3270 * Check to see if the user wants to pass non-ip 3271 * packets, these will not be checked by pfil(9) and 3272 * passed unconditionally so the default is to drop. 3273 */ 3274 if (V_pfil_onlyip) 3275 goto bad; 3276 } 3277 3278 /* Run the packet through pfil before stripping link headers */ 3279 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3280 dir == PFIL_OUT && ifp != NULL) { 3281 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) { 3282 case PFIL_DROPPED: 3283 return (EACCES); 3284 case PFIL_CONSUMED: 3285 return (0); 3286 } 3287 } 3288 3289 /* Strip off the Ethernet header and keep a copy. */ 3290 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3291 m_adj(*mp, ETHER_HDR_LEN); 3292 3293 /* Strip off snap header, if present */ 3294 if (snap) { 3295 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3296 m_adj(*mp, sizeof(struct llc)); 3297 } 3298 3299 /* 3300 * Check the IP header for alignment and errors 3301 */ 3302 if (dir == PFIL_IN) { 3303 switch (ether_type) { 3304 case ETHERTYPE_IP: 3305 error = bridge_ip_checkbasic(mp); 3306 break; 3307 #ifdef INET6 3308 case ETHERTYPE_IPV6: 3309 error = bridge_ip6_checkbasic(mp); 3310 break; 3311 #endif /* INET6 */ 3312 default: 3313 error = 0; 3314 } 3315 if (error) 3316 goto bad; 3317 } 3318 3319 error = 0; 3320 3321 /* 3322 * Run the packet through pfil 3323 */ 3324 rv = PFIL_PASS; 3325 switch (ether_type) { 3326 case ETHERTYPE_IP: 3327 /* 3328 * Run pfil on the member interface and the bridge, both can 3329 * be skipped by clearing pfil_member or pfil_bridge. 3330 * 3331 * Keep the order: 3332 * in_if -> bridge_if -> out_if 3333 */ 3334 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3335 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) != 3336 PFIL_PASS) 3337 break; 3338 3339 if (V_pfil_member && ifp != NULL && (rv = 3340 pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) != 3341 PFIL_PASS) 3342 break; 3343 3344 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3345 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) != 3346 PFIL_PASS) 3347 break; 3348 3349 /* check if we need to fragment the packet */ 3350 /* bridge_fragment generates a mbuf chain of packets */ 3351 /* that already include eth headers */ 3352 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3353 i = (*mp)->m_pkthdr.len; 3354 if (i > ifp->if_mtu) { 3355 error = bridge_fragment(ifp, mp, &eh2, snap, 3356 &llc1); 3357 return (error); 3358 } 3359 } 3360 3361 /* Recalculate the ip checksum. */ 3362 ip = mtod(*mp, struct ip *); 3363 hlen = ip->ip_hl << 2; 3364 if (hlen < sizeof(struct ip)) 3365 goto bad; 3366 if (hlen > (*mp)->m_len) { 3367 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3368 goto bad; 3369 ip = mtod(*mp, struct ip *); 3370 if (ip == NULL) 3371 goto bad; 3372 } 3373 ip->ip_sum = 0; 3374 if (hlen == sizeof(struct ip)) 3375 ip->ip_sum = in_cksum_hdr(ip); 3376 else 3377 ip->ip_sum = in_cksum(*mp, hlen); 3378 3379 break; 3380 #ifdef INET6 3381 case ETHERTYPE_IPV6: 3382 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3383 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) != 3384 PFIL_PASS) 3385 break; 3386 3387 if (V_pfil_member && ifp != NULL && (rv = 3388 pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) != 3389 PFIL_PASS) 3390 break; 3391 3392 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3393 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) != 3394 PFIL_PASS) 3395 break; 3396 break; 3397 #endif 3398 } 3399 3400 switch (rv) { 3401 case PFIL_CONSUMED: 3402 return (0); 3403 case PFIL_DROPPED: 3404 return (EACCES); 3405 default: 3406 break; 3407 } 3408 3409 error = -1; 3410 3411 /* 3412 * Finally, put everything back the way it was and return 3413 */ 3414 if (snap) { 3415 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3416 if (*mp == NULL) 3417 return (error); 3418 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3419 } 3420 3421 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3422 if (*mp == NULL) 3423 return (error); 3424 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3425 3426 return (0); 3427 3428 bad: 3429 m_freem(*mp); 3430 *mp = NULL; 3431 return (error); 3432 } 3433 3434 /* 3435 * Perform basic checks on header size since 3436 * pfil assumes ip_input has already processed 3437 * it for it. Cut-and-pasted from ip_input.c. 3438 * Given how simple the IPv6 version is, 3439 * does the IPv4 version really need to be 3440 * this complicated? 3441 * 3442 * XXX Should we update ipstat here, or not? 3443 * XXX Right now we update ipstat but not 3444 * XXX csum_counter. 3445 */ 3446 static int 3447 bridge_ip_checkbasic(struct mbuf **mp) 3448 { 3449 struct mbuf *m = *mp; 3450 struct ip *ip; 3451 int len, hlen; 3452 u_short sum; 3453 3454 if (*mp == NULL) 3455 return (-1); 3456 3457 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3458 if ((m = m_copyup(m, sizeof(struct ip), 3459 (max_linkhdr + 3) & ~3)) == NULL) { 3460 /* XXXJRT new stat, please */ 3461 KMOD_IPSTAT_INC(ips_toosmall); 3462 goto bad; 3463 } 3464 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3465 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3466 KMOD_IPSTAT_INC(ips_toosmall); 3467 goto bad; 3468 } 3469 } 3470 ip = mtod(m, struct ip *); 3471 if (ip == NULL) goto bad; 3472 3473 if (ip->ip_v != IPVERSION) { 3474 KMOD_IPSTAT_INC(ips_badvers); 3475 goto bad; 3476 } 3477 hlen = ip->ip_hl << 2; 3478 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3479 KMOD_IPSTAT_INC(ips_badhlen); 3480 goto bad; 3481 } 3482 if (hlen > m->m_len) { 3483 if ((m = m_pullup(m, hlen)) == NULL) { 3484 KMOD_IPSTAT_INC(ips_badhlen); 3485 goto bad; 3486 } 3487 ip = mtod(m, struct ip *); 3488 if (ip == NULL) goto bad; 3489 } 3490 3491 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3492 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3493 } else { 3494 if (hlen == sizeof(struct ip)) { 3495 sum = in_cksum_hdr(ip); 3496 } else { 3497 sum = in_cksum(m, hlen); 3498 } 3499 } 3500 if (sum) { 3501 KMOD_IPSTAT_INC(ips_badsum); 3502 goto bad; 3503 } 3504 3505 /* Retrieve the packet length. */ 3506 len = ntohs(ip->ip_len); 3507 3508 /* 3509 * Check for additional length bogosity 3510 */ 3511 if (len < hlen) { 3512 KMOD_IPSTAT_INC(ips_badlen); 3513 goto bad; 3514 } 3515 3516 /* 3517 * Check that the amount of data in the buffers 3518 * is as at least much as the IP header would have us expect. 3519 * Drop packet if shorter than we expect. 3520 */ 3521 if (m->m_pkthdr.len < len) { 3522 KMOD_IPSTAT_INC(ips_tooshort); 3523 goto bad; 3524 } 3525 3526 /* Checks out, proceed */ 3527 *mp = m; 3528 return (0); 3529 3530 bad: 3531 *mp = m; 3532 return (-1); 3533 } 3534 3535 #ifdef INET6 3536 /* 3537 * Same as above, but for IPv6. 3538 * Cut-and-pasted from ip6_input.c. 3539 * XXX Should we update ip6stat, or not? 3540 */ 3541 static int 3542 bridge_ip6_checkbasic(struct mbuf **mp) 3543 { 3544 struct mbuf *m = *mp; 3545 struct ip6_hdr *ip6; 3546 3547 /* 3548 * If the IPv6 header is not aligned, slurp it up into a new 3549 * mbuf with space for link headers, in the event we forward 3550 * it. Otherwise, if it is aligned, make sure the entire base 3551 * IPv6 header is in the first mbuf of the chain. 3552 */ 3553 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3554 struct ifnet *inifp = m->m_pkthdr.rcvif; 3555 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3556 (max_linkhdr + 3) & ~3)) == NULL) { 3557 /* XXXJRT new stat, please */ 3558 IP6STAT_INC(ip6s_toosmall); 3559 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3560 goto bad; 3561 } 3562 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3563 struct ifnet *inifp = m->m_pkthdr.rcvif; 3564 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3565 IP6STAT_INC(ip6s_toosmall); 3566 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3567 goto bad; 3568 } 3569 } 3570 3571 ip6 = mtod(m, struct ip6_hdr *); 3572 3573 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3574 IP6STAT_INC(ip6s_badvers); 3575 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3576 goto bad; 3577 } 3578 3579 /* Checks out, proceed */ 3580 *mp = m; 3581 return (0); 3582 3583 bad: 3584 *mp = m; 3585 return (-1); 3586 } 3587 #endif /* INET6 */ 3588 3589 /* 3590 * bridge_fragment: 3591 * 3592 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3593 */ 3594 static int 3595 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3596 int snap, struct llc *llc) 3597 { 3598 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3599 struct ip *ip; 3600 int error = -1; 3601 3602 if (m->m_len < sizeof(struct ip) && 3603 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3604 goto dropit; 3605 ip = mtod(m, struct ip *); 3606 3607 m->m_pkthdr.csum_flags |= CSUM_IP; 3608 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3609 if (error) 3610 goto dropit; 3611 3612 /* 3613 * Walk the chain and re-add the Ethernet header for 3614 * each mbuf packet. 3615 */ 3616 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3617 nextpkt = mcur->m_nextpkt; 3618 mcur->m_nextpkt = NULL; 3619 if (snap) { 3620 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3621 if (mcur == NULL) { 3622 error = ENOBUFS; 3623 if (mprev != NULL) 3624 mprev->m_nextpkt = nextpkt; 3625 goto dropit; 3626 } 3627 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3628 } 3629 3630 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3631 if (mcur == NULL) { 3632 error = ENOBUFS; 3633 if (mprev != NULL) 3634 mprev->m_nextpkt = nextpkt; 3635 goto dropit; 3636 } 3637 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3638 3639 /* 3640 * The previous two M_PREPEND could have inserted one or two 3641 * mbufs in front so we have to update the previous packet's 3642 * m_nextpkt. 3643 */ 3644 mcur->m_nextpkt = nextpkt; 3645 if (mprev != NULL) 3646 mprev->m_nextpkt = mcur; 3647 else { 3648 /* The first mbuf in the original chain needs to be 3649 * updated. */ 3650 *mp = mcur; 3651 } 3652 mprev = mcur; 3653 } 3654 3655 KMOD_IPSTAT_INC(ips_fragmented); 3656 return (error); 3657 3658 dropit: 3659 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3660 m = mcur->m_nextpkt; 3661 m_freem(mcur); 3662 } 3663 return (error); 3664 } 3665 3666 static void 3667 bridge_linkstate(struct ifnet *ifp) 3668 { 3669 struct bridge_softc *sc = ifp->if_bridge; 3670 struct bridge_iflist *bif; 3671 struct epoch_tracker et; 3672 3673 NET_EPOCH_ENTER(et); 3674 3675 bif = bridge_lookup_member_if(sc, ifp); 3676 if (bif == NULL) { 3677 NET_EPOCH_EXIT(et); 3678 return; 3679 } 3680 bridge_linkcheck(sc); 3681 3682 bstp_linkstate(&bif->bif_stp); 3683 3684 NET_EPOCH_EXIT(et); 3685 } 3686 3687 static void 3688 bridge_linkcheck(struct bridge_softc *sc) 3689 { 3690 struct bridge_iflist *bif; 3691 int new_link, hasls; 3692 3693 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3694 3695 new_link = LINK_STATE_DOWN; 3696 hasls = 0; 3697 /* Our link is considered up if at least one of our ports is active */ 3698 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3699 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3700 hasls++; 3701 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3702 new_link = LINK_STATE_UP; 3703 break; 3704 } 3705 } 3706 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3707 /* If no interfaces support link-state then we default to up */ 3708 new_link = LINK_STATE_UP; 3709 } 3710 if_link_state_change(sc->sc_ifp, new_link); 3711 } 3712