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