1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/if_private.h> 114 #include <net/pfil.h> 115 #include <net/vnet.h> 116 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/in_var.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #ifdef INET6 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/in6_ifattach.h> 126 #endif 127 #if defined(INET) || defined(INET6) 128 #include <netinet/ip_carp.h> 129 #endif 130 #include <machine/in_cksum.h> 131 #include <netinet/if_ether.h> 132 #include <net/bridgestp.h> 133 #include <net/if_bridgevar.h> 134 #include <net/if_llc.h> 135 #include <net/if_vlan_var.h> 136 137 #include <net/route.h> 138 139 /* 140 * Size of the route hash table. Must be a power of two. 141 */ 142 #ifndef BRIDGE_RTHASH_SIZE 143 #define BRIDGE_RTHASH_SIZE 1024 144 #endif 145 146 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 147 148 /* 149 * Default maximum number of addresses to cache. 150 */ 151 #ifndef BRIDGE_RTABLE_MAX 152 #define BRIDGE_RTABLE_MAX 2000 153 #endif 154 155 /* 156 * Timeout (in seconds) for entries learned dynamically. 157 */ 158 #ifndef BRIDGE_RTABLE_TIMEOUT 159 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 160 #endif 161 162 /* 163 * Number of seconds between walks of the route list. 164 */ 165 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 166 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 167 #endif 168 169 /* 170 * List of capabilities to possibly mask on the member interface. 171 */ 172 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 173 IFCAP_TXCSUM_IPV6) 174 175 /* 176 * List of capabilities to strip 177 */ 178 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 179 180 /* 181 * Bridge locking 182 * 183 * The bridge relies heavily on the epoch(9) system to protect its data 184 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 185 * must ensure there is only one writer at a time. 186 * 187 * That is: for read accesses we only need to be in NET_EPOCH, but for write 188 * accesses we must hold: 189 * 190 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 191 * - BRIDGE_LOCK, for any other change 192 * 193 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 194 * calls to bridge member interfaces and these ioctl()s can sleep. 195 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 196 * required while we're in NET_EPOCH and then we're not allowed to sleep. 197 */ 198 #define BRIDGE_LOCK_INIT(_sc) do { \ 199 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 200 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 201 } while (0) 202 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 203 sx_destroy(&(_sc)->sc_sx); \ 204 mtx_destroy(&(_sc)->sc_rt_mtx); \ 205 } while (0) 206 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 207 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 208 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 209 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 210 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 211 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 212 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 213 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 214 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 215 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 216 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 217 218 /* 219 * Bridge interface list entry. 220 */ 221 struct bridge_iflist { 222 CK_LIST_ENTRY(bridge_iflist) bif_next; 223 struct ifnet *bif_ifp; /* member if */ 224 struct bstp_port bif_stp; /* STP state */ 225 uint32_t bif_flags; /* member if flags */ 226 int bif_savedcaps; /* saved capabilities */ 227 uint32_t bif_addrmax; /* max # of addresses */ 228 uint32_t bif_addrcnt; /* cur. # of addresses */ 229 uint32_t bif_addrexceeded;/* # of address violations */ 230 struct epoch_context bif_epoch_ctx; 231 }; 232 233 /* 234 * Bridge route node. 235 */ 236 struct bridge_rtnode { 237 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 238 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 239 struct bridge_iflist *brt_dst; /* destination if */ 240 unsigned long brt_expire; /* expiration time */ 241 uint8_t brt_flags; /* address flags */ 242 uint8_t brt_addr[ETHER_ADDR_LEN]; 243 uint16_t brt_vlan; /* vlan id */ 244 struct vnet *brt_vnet; 245 struct epoch_context brt_epoch_ctx; 246 }; 247 #define brt_ifp brt_dst->bif_ifp 248 249 /* 250 * Software state for each bridge. 251 */ 252 struct bridge_softc { 253 struct ifnet *sc_ifp; /* make this an interface */ 254 LIST_ENTRY(bridge_softc) sc_list; 255 struct sx sc_sx; 256 struct mtx sc_rt_mtx; 257 uint32_t sc_brtmax; /* max # of addresses */ 258 uint32_t sc_brtcnt; /* cur. # of addresses */ 259 uint32_t sc_brttimeout; /* rt timeout in seconds */ 260 struct callout sc_brcallout; /* bridge callout */ 261 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 262 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 263 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 264 uint32_t sc_rthash_key; /* key for hash */ 265 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 266 struct bstp_state sc_stp; /* STP state */ 267 uint32_t sc_brtexceeded; /* # of cache drops */ 268 struct ifnet *sc_ifaddr; /* member mac copied from */ 269 struct ether_addr sc_defaddr; /* Default MAC address */ 270 if_input_fn_t sc_if_input; /* Saved copy of if_input */ 271 struct epoch_context sc_epoch_ctx; 272 }; 273 274 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 275 #define V_bridge_list_sx VNET(bridge_list_sx) 276 static eventhandler_tag bridge_detach_cookie; 277 278 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 279 280 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 281 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 282 283 static int bridge_clone_create(struct if_clone *, char *, size_t, 284 struct ifc_data *, struct ifnet **); 285 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 286 287 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 288 static void bridge_mutecaps(struct bridge_softc *); 289 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 290 int); 291 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 292 static void bridge_init(void *); 293 static void bridge_dummynet(struct mbuf *, struct ifnet *); 294 static void bridge_stop(struct ifnet *, int); 295 static int bridge_transmit(struct ifnet *, struct mbuf *); 296 #ifdef ALTQ 297 static void bridge_altq_start(if_t); 298 static int bridge_altq_transmit(if_t, struct mbuf *); 299 #endif 300 static void bridge_qflush(struct ifnet *); 301 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 302 static void bridge_inject(struct ifnet *, struct mbuf *); 303 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 304 struct rtentry *); 305 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 306 struct mbuf *); 307 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 308 309 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 310 struct mbuf *m); 311 312 static void bridge_timer(void *); 313 314 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 315 struct mbuf *, int); 316 static void bridge_span(struct bridge_softc *, struct mbuf *); 317 318 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 319 uint16_t, struct bridge_iflist *, int, uint8_t); 320 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 321 uint16_t); 322 static void bridge_rttrim(struct bridge_softc *); 323 static void bridge_rtage(struct bridge_softc *); 324 static void bridge_rtflush(struct bridge_softc *, int); 325 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 326 uint16_t); 327 328 static void bridge_rtable_init(struct bridge_softc *); 329 static void bridge_rtable_fini(struct bridge_softc *); 330 331 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 332 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 333 const uint8_t *, uint16_t); 334 static int bridge_rtnode_insert(struct bridge_softc *, 335 struct bridge_rtnode *); 336 static void bridge_rtnode_destroy(struct bridge_softc *, 337 struct bridge_rtnode *); 338 static void bridge_rtable_expire(struct ifnet *, int); 339 static void bridge_state_change(struct ifnet *, int); 340 341 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 342 const char *name); 343 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 344 struct ifnet *ifp); 345 static void bridge_delete_member(struct bridge_softc *, 346 struct bridge_iflist *, int); 347 static void bridge_delete_span(struct bridge_softc *, 348 struct bridge_iflist *); 349 350 static int bridge_ioctl_add(struct bridge_softc *, void *); 351 static int bridge_ioctl_del(struct bridge_softc *, void *); 352 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 353 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 354 static int bridge_ioctl_scache(struct bridge_softc *, void *); 355 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 356 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 357 static int bridge_ioctl_rts(struct bridge_softc *, void *); 358 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 359 static int bridge_ioctl_sto(struct bridge_softc *, void *); 360 static int bridge_ioctl_gto(struct bridge_softc *, void *); 361 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 362 static int bridge_ioctl_flush(struct bridge_softc *, void *); 363 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 364 static int bridge_ioctl_spri(struct bridge_softc *, void *); 365 static int bridge_ioctl_ght(struct bridge_softc *, void *); 366 static int bridge_ioctl_sht(struct bridge_softc *, void *); 367 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 368 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 369 static int bridge_ioctl_gma(struct bridge_softc *, void *); 370 static int bridge_ioctl_sma(struct bridge_softc *, void *); 371 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 372 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 373 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 374 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 375 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 376 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 377 static int bridge_ioctl_grte(struct bridge_softc *, void *); 378 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 379 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 380 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 381 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 382 int); 383 static int bridge_ip_checkbasic(struct mbuf **mp); 384 #ifdef INET6 385 static int bridge_ip6_checkbasic(struct mbuf **mp); 386 #endif /* INET6 */ 387 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 388 struct ether_header *, int, struct llc *); 389 static void bridge_linkstate(struct ifnet *ifp); 390 static void bridge_linkcheck(struct bridge_softc *sc); 391 392 /* 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) = 0; 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) = 0; 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 /* log MAC address port flapping */ 466 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 467 #define V_log_mac_flap VNET(log_mac_flap) 468 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 469 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 470 "Log MAC address port flapping"); 471 472 VNET_DEFINE_STATIC(int, log_interval) = 5; 473 VNET_DEFINE_STATIC(int, log_count) = 0; 474 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 475 476 #define V_log_interval VNET(log_interval) 477 #define V_log_count VNET(log_count) 478 #define V_log_last VNET(log_last) 479 480 struct bridge_control { 481 int (*bc_func)(struct bridge_softc *, void *); 482 int bc_argsize; 483 int bc_flags; 484 }; 485 486 #define BC_F_COPYIN 0x01 /* copy arguments in */ 487 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 488 #define BC_F_SUSER 0x04 /* do super-user check */ 489 490 static const struct bridge_control bridge_control_table[] = { 491 { bridge_ioctl_add, sizeof(struct ifbreq), 492 BC_F_COPYIN|BC_F_SUSER }, 493 { bridge_ioctl_del, sizeof(struct ifbreq), 494 BC_F_COPYIN|BC_F_SUSER }, 495 496 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 497 BC_F_COPYIN|BC_F_COPYOUT }, 498 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 499 BC_F_COPYIN|BC_F_SUSER }, 500 501 { bridge_ioctl_scache, sizeof(struct ifbrparam), 502 BC_F_COPYIN|BC_F_SUSER }, 503 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 504 BC_F_COPYOUT }, 505 506 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 507 BC_F_COPYIN|BC_F_COPYOUT }, 508 { bridge_ioctl_rts, sizeof(struct ifbaconf), 509 BC_F_COPYIN|BC_F_COPYOUT }, 510 511 { bridge_ioctl_saddr, sizeof(struct ifbareq), 512 BC_F_COPYIN|BC_F_SUSER }, 513 514 { bridge_ioctl_sto, sizeof(struct ifbrparam), 515 BC_F_COPYIN|BC_F_SUSER }, 516 { bridge_ioctl_gto, sizeof(struct ifbrparam), 517 BC_F_COPYOUT }, 518 519 { bridge_ioctl_daddr, sizeof(struct ifbareq), 520 BC_F_COPYIN|BC_F_SUSER }, 521 522 { bridge_ioctl_flush, sizeof(struct ifbreq), 523 BC_F_COPYIN|BC_F_SUSER }, 524 525 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 526 BC_F_COPYOUT }, 527 { bridge_ioctl_spri, sizeof(struct ifbrparam), 528 BC_F_COPYIN|BC_F_SUSER }, 529 530 { bridge_ioctl_ght, sizeof(struct ifbrparam), 531 BC_F_COPYOUT }, 532 { bridge_ioctl_sht, sizeof(struct ifbrparam), 533 BC_F_COPYIN|BC_F_SUSER }, 534 535 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 536 BC_F_COPYOUT }, 537 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 538 BC_F_COPYIN|BC_F_SUSER }, 539 540 { bridge_ioctl_gma, sizeof(struct ifbrparam), 541 BC_F_COPYOUT }, 542 { bridge_ioctl_sma, sizeof(struct ifbrparam), 543 BC_F_COPYIN|BC_F_SUSER }, 544 545 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 546 BC_F_COPYIN|BC_F_SUSER }, 547 548 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 549 BC_F_COPYIN|BC_F_SUSER }, 550 551 { bridge_ioctl_addspan, sizeof(struct ifbreq), 552 BC_F_COPYIN|BC_F_SUSER }, 553 { bridge_ioctl_delspan, sizeof(struct ifbreq), 554 BC_F_COPYIN|BC_F_SUSER }, 555 556 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 557 BC_F_COPYOUT }, 558 559 { bridge_ioctl_grte, sizeof(struct ifbrparam), 560 BC_F_COPYOUT }, 561 562 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 563 BC_F_COPYIN|BC_F_COPYOUT }, 564 565 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 566 BC_F_COPYIN|BC_F_SUSER }, 567 568 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 569 BC_F_COPYIN|BC_F_SUSER }, 570 571 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 572 BC_F_COPYIN|BC_F_SUSER }, 573 574 }; 575 static const int bridge_control_table_size = nitems(bridge_control_table); 576 577 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 578 #define V_bridge_list VNET(bridge_list) 579 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 580 "if_bridge list") 581 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 582 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 583 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 584 585 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 586 #define V_bridge_cloner VNET(bridge_cloner) 587 588 static const char bridge_name[] = "bridge"; 589 590 static void 591 vnet_bridge_init(const void *unused __unused) 592 { 593 594 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 595 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 596 UMA_ALIGN_PTR, 0); 597 BRIDGE_LIST_LOCK_INIT(); 598 LIST_INIT(&V_bridge_list); 599 600 struct if_clone_addreq req = { 601 .create_f = bridge_clone_create, 602 .destroy_f = bridge_clone_destroy, 603 .flags = IFC_F_AUTOUNIT, 604 }; 605 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 606 } 607 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 608 vnet_bridge_init, NULL); 609 610 static void 611 vnet_bridge_uninit(const void *unused __unused) 612 { 613 614 ifc_detach_cloner(V_bridge_cloner); 615 V_bridge_cloner = NULL; 616 BRIDGE_LIST_LOCK_DESTROY(); 617 618 /* Callbacks may use the UMA zone. */ 619 NET_EPOCH_DRAIN_CALLBACKS(); 620 621 uma_zdestroy(V_bridge_rtnode_zone); 622 } 623 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 624 vnet_bridge_uninit, NULL); 625 626 static int 627 bridge_modevent(module_t mod, int type, void *data) 628 { 629 630 switch (type) { 631 case MOD_LOAD: 632 bridge_dn_p = bridge_dummynet; 633 bridge_detach_cookie = EVENTHANDLER_REGISTER( 634 ifnet_departure_event, bridge_ifdetach, NULL, 635 EVENTHANDLER_PRI_ANY); 636 break; 637 case MOD_UNLOAD: 638 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 639 bridge_detach_cookie); 640 bridge_dn_p = NULL; 641 break; 642 default: 643 return (EOPNOTSUPP); 644 } 645 return (0); 646 } 647 648 static moduledata_t bridge_mod = { 649 "if_bridge", 650 bridge_modevent, 651 0 652 }; 653 654 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 655 MODULE_VERSION(if_bridge, 1); 656 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 657 658 /* 659 * handler for net.link.bridge.ipfw 660 */ 661 static int 662 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 663 { 664 int enable = V_pfil_ipfw; 665 int error; 666 667 error = sysctl_handle_int(oidp, &enable, 0, req); 668 enable &= 1; 669 670 if (enable != V_pfil_ipfw) { 671 V_pfil_ipfw = enable; 672 673 /* 674 * Disable pfil so that ipfw doesnt run twice, if the user 675 * really wants both then they can re-enable pfil_bridge and/or 676 * pfil_member. Also allow non-ip packets as ipfw can filter by 677 * layer2 type. 678 */ 679 if (V_pfil_ipfw) { 680 V_pfil_onlyip = 0; 681 V_pfil_bridge = 0; 682 V_pfil_member = 0; 683 } 684 } 685 686 return (error); 687 } 688 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 689 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 690 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 691 "Layer2 filter with IPFW"); 692 693 #ifdef VIMAGE 694 static void 695 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 696 { 697 struct bridge_softc *sc = ifp->if_softc; 698 struct bridge_iflist *bif; 699 700 BRIDGE_LOCK(sc); 701 702 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 703 bridge_delete_member(sc, bif, 0); 704 705 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 706 bridge_delete_span(sc, bif); 707 } 708 709 BRIDGE_UNLOCK(sc); 710 711 ether_reassign(ifp, newvnet, arg); 712 } 713 #endif 714 715 /* 716 * bridge_clone_create: 717 * 718 * Create a new bridge instance. 719 */ 720 static int 721 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 722 struct ifc_data *ifd, struct ifnet **ifpp) 723 { 724 struct bridge_softc *sc; 725 struct ifnet *ifp; 726 727 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 728 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 729 if (ifp == NULL) { 730 free(sc, M_DEVBUF); 731 return (ENOSPC); 732 } 733 734 BRIDGE_LOCK_INIT(sc); 735 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 736 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 737 738 /* Initialize our routing table. */ 739 bridge_rtable_init(sc); 740 741 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 742 743 CK_LIST_INIT(&sc->sc_iflist); 744 CK_LIST_INIT(&sc->sc_spanlist); 745 746 ifp->if_softc = sc; 747 if_initname(ifp, bridge_name, ifd->unit); 748 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 749 ifp->if_ioctl = bridge_ioctl; 750 #ifdef ALTQ 751 ifp->if_start = bridge_altq_start; 752 ifp->if_transmit = bridge_altq_transmit; 753 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 754 ifp->if_snd.ifq_drv_maxlen = 0; 755 IFQ_SET_READY(&ifp->if_snd); 756 #else 757 ifp->if_transmit = bridge_transmit; 758 #endif 759 ifp->if_qflush = bridge_qflush; 760 ifp->if_init = bridge_init; 761 ifp->if_type = IFT_BRIDGE; 762 763 ether_gen_addr(ifp, &sc->sc_defaddr); 764 765 bstp_attach(&sc->sc_stp, &bridge_ops); 766 ether_ifattach(ifp, sc->sc_defaddr.octet); 767 /* Now undo some of the damage... */ 768 ifp->if_baudrate = 0; 769 ifp->if_type = IFT_BRIDGE; 770 #ifdef VIMAGE 771 ifp->if_reassign = bridge_reassign; 772 #endif 773 sc->sc_if_input = ifp->if_input; /* ether_input */ 774 ifp->if_input = bridge_inject; 775 776 /* 777 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge 778 * itself via bridge_inject(). This is required for netmap but 779 * otherwise has no effect. 780 */ 781 ifp->if_bridge_input = bridge_input; 782 783 BRIDGE_LIST_LOCK(); 784 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 785 BRIDGE_LIST_UNLOCK(); 786 *ifpp = ifp; 787 788 return (0); 789 } 790 791 static void 792 bridge_clone_destroy_cb(struct epoch_context *ctx) 793 { 794 struct bridge_softc *sc; 795 796 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 797 798 BRIDGE_LOCK_DESTROY(sc); 799 free(sc, M_DEVBUF); 800 } 801 802 /* 803 * bridge_clone_destroy: 804 * 805 * Destroy a bridge instance. 806 */ 807 static int 808 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 809 { 810 struct bridge_softc *sc = ifp->if_softc; 811 struct bridge_iflist *bif; 812 struct epoch_tracker et; 813 814 BRIDGE_LOCK(sc); 815 816 bridge_stop(ifp, 1); 817 ifp->if_flags &= ~IFF_UP; 818 819 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 820 bridge_delete_member(sc, bif, 0); 821 822 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 823 bridge_delete_span(sc, bif); 824 } 825 826 /* Tear down the routing table. */ 827 bridge_rtable_fini(sc); 828 829 BRIDGE_UNLOCK(sc); 830 831 NET_EPOCH_ENTER(et); 832 833 callout_drain(&sc->sc_brcallout); 834 835 BRIDGE_LIST_LOCK(); 836 LIST_REMOVE(sc, sc_list); 837 BRIDGE_LIST_UNLOCK(); 838 839 bstp_detach(&sc->sc_stp); 840 #ifdef ALTQ 841 IFQ_PURGE(&ifp->if_snd); 842 #endif 843 NET_EPOCH_EXIT(et); 844 845 ether_ifdetach(ifp); 846 if_free(ifp); 847 848 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 849 850 return (0); 851 } 852 853 /* 854 * bridge_ioctl: 855 * 856 * Handle a control request from the operator. 857 */ 858 static int 859 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 860 { 861 struct bridge_softc *sc = ifp->if_softc; 862 struct ifreq *ifr = (struct ifreq *)data; 863 struct bridge_iflist *bif; 864 struct thread *td = curthread; 865 union { 866 struct ifbreq ifbreq; 867 struct ifbifconf ifbifconf; 868 struct ifbareq ifbareq; 869 struct ifbaconf ifbaconf; 870 struct ifbrparam ifbrparam; 871 struct ifbropreq ifbropreq; 872 } args; 873 struct ifdrv *ifd = (struct ifdrv *) data; 874 const struct bridge_control *bc; 875 int error = 0, oldmtu; 876 877 BRIDGE_LOCK(sc); 878 879 switch (cmd) { 880 case SIOCADDMULTI: 881 case SIOCDELMULTI: 882 break; 883 884 case SIOCGDRVSPEC: 885 case SIOCSDRVSPEC: 886 if (ifd->ifd_cmd >= bridge_control_table_size) { 887 error = EINVAL; 888 break; 889 } 890 bc = &bridge_control_table[ifd->ifd_cmd]; 891 892 if (cmd == SIOCGDRVSPEC && 893 (bc->bc_flags & BC_F_COPYOUT) == 0) { 894 error = EINVAL; 895 break; 896 } 897 else if (cmd == SIOCSDRVSPEC && 898 (bc->bc_flags & BC_F_COPYOUT) != 0) { 899 error = EINVAL; 900 break; 901 } 902 903 if (bc->bc_flags & BC_F_SUSER) { 904 error = priv_check(td, PRIV_NET_BRIDGE); 905 if (error) 906 break; 907 } 908 909 if (ifd->ifd_len != bc->bc_argsize || 910 ifd->ifd_len > sizeof(args)) { 911 error = EINVAL; 912 break; 913 } 914 915 bzero(&args, sizeof(args)); 916 if (bc->bc_flags & BC_F_COPYIN) { 917 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 918 if (error) 919 break; 920 } 921 922 oldmtu = ifp->if_mtu; 923 error = (*bc->bc_func)(sc, &args); 924 if (error) 925 break; 926 927 /* 928 * Bridge MTU may change during addition of the first port. 929 * If it did, do network layer specific procedure. 930 */ 931 if (ifp->if_mtu != oldmtu) 932 if_notifymtu(ifp); 933 934 if (bc->bc_flags & BC_F_COPYOUT) 935 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 936 937 break; 938 939 case SIOCSIFFLAGS: 940 if (!(ifp->if_flags & IFF_UP) && 941 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 942 /* 943 * If interface is marked down and it is running, 944 * then stop and disable it. 945 */ 946 bridge_stop(ifp, 1); 947 } else if ((ifp->if_flags & IFF_UP) && 948 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 949 /* 950 * If interface is marked up and it is stopped, then 951 * start it. 952 */ 953 BRIDGE_UNLOCK(sc); 954 (*ifp->if_init)(sc); 955 BRIDGE_LOCK(sc); 956 } 957 break; 958 959 case SIOCSIFMTU: 960 oldmtu = sc->sc_ifp->if_mtu; 961 962 if (ifr->ifr_mtu < 576) { 963 error = EINVAL; 964 break; 965 } 966 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 967 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 968 break; 969 } 970 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 971 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 972 SIOCSIFMTU, (caddr_t)ifr); 973 if (error != 0) { 974 log(LOG_NOTICE, "%s: invalid MTU: %u for" 975 " member %s\n", sc->sc_ifp->if_xname, 976 ifr->ifr_mtu, 977 bif->bif_ifp->if_xname); 978 error = EINVAL; 979 break; 980 } 981 } 982 if (error) { 983 /* Restore the previous MTU on all member interfaces. */ 984 ifr->ifr_mtu = oldmtu; 985 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 986 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 987 SIOCSIFMTU, (caddr_t)ifr); 988 } 989 } else { 990 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 991 } 992 break; 993 default: 994 /* 995 * drop the lock as ether_ioctl() will call bridge_start() and 996 * cause the lock to be recursed. 997 */ 998 BRIDGE_UNLOCK(sc); 999 error = ether_ioctl(ifp, cmd, data); 1000 BRIDGE_LOCK(sc); 1001 break; 1002 } 1003 1004 BRIDGE_UNLOCK(sc); 1005 1006 return (error); 1007 } 1008 1009 /* 1010 * bridge_mutecaps: 1011 * 1012 * Clear or restore unwanted capabilities on the member interface 1013 */ 1014 static void 1015 bridge_mutecaps(struct bridge_softc *sc) 1016 { 1017 struct bridge_iflist *bif; 1018 int enabled, mask; 1019 1020 BRIDGE_LOCK_ASSERT(sc); 1021 1022 /* Initial bitmask of capabilities to test */ 1023 mask = BRIDGE_IFCAPS_MASK; 1024 1025 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1026 /* Every member must support it or its disabled */ 1027 mask &= bif->bif_savedcaps; 1028 } 1029 1030 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1031 enabled = bif->bif_ifp->if_capenable; 1032 enabled &= ~BRIDGE_IFCAPS_STRIP; 1033 /* strip off mask bits and enable them again if allowed */ 1034 enabled &= ~BRIDGE_IFCAPS_MASK; 1035 enabled |= mask; 1036 bridge_set_ifcap(sc, bif, enabled); 1037 } 1038 } 1039 1040 static void 1041 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1042 { 1043 struct ifnet *ifp = bif->bif_ifp; 1044 struct ifreq ifr; 1045 int error, mask, stuck; 1046 1047 bzero(&ifr, sizeof(ifr)); 1048 ifr.ifr_reqcap = set; 1049 1050 if (ifp->if_capenable != set) { 1051 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1052 if (error) 1053 if_printf(sc->sc_ifp, 1054 "error setting capabilities on %s: %d\n", 1055 ifp->if_xname, error); 1056 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1057 stuck = ifp->if_capenable & mask & ~set; 1058 if (stuck != 0) 1059 if_printf(sc->sc_ifp, 1060 "can't disable some capabilities on %s: 0x%x\n", 1061 ifp->if_xname, stuck); 1062 } 1063 } 1064 1065 /* 1066 * bridge_lookup_member: 1067 * 1068 * Lookup a bridge member interface. 1069 */ 1070 static struct bridge_iflist * 1071 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1072 { 1073 struct bridge_iflist *bif; 1074 struct ifnet *ifp; 1075 1076 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1077 1078 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1079 ifp = bif->bif_ifp; 1080 if (strcmp(ifp->if_xname, name) == 0) 1081 return (bif); 1082 } 1083 1084 return (NULL); 1085 } 1086 1087 /* 1088 * bridge_lookup_member_if: 1089 * 1090 * Lookup a bridge member interface by ifnet*. 1091 */ 1092 static struct bridge_iflist * 1093 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1094 { 1095 struct bridge_iflist *bif; 1096 1097 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1098 1099 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1100 if (bif->bif_ifp == member_ifp) 1101 return (bif); 1102 } 1103 1104 return (NULL); 1105 } 1106 1107 static void 1108 bridge_delete_member_cb(struct epoch_context *ctx) 1109 { 1110 struct bridge_iflist *bif; 1111 1112 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1113 1114 free(bif, M_DEVBUF); 1115 } 1116 1117 /* 1118 * bridge_delete_member: 1119 * 1120 * Delete the specified member interface. 1121 */ 1122 static void 1123 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1124 int gone) 1125 { 1126 struct ifnet *ifs = bif->bif_ifp; 1127 struct ifnet *fif = NULL; 1128 struct bridge_iflist *bifl; 1129 1130 BRIDGE_LOCK_ASSERT(sc); 1131 1132 if (bif->bif_flags & IFBIF_STP) 1133 bstp_disable(&bif->bif_stp); 1134 1135 ifs->if_bridge = NULL; 1136 CK_LIST_REMOVE(bif, bif_next); 1137 1138 /* 1139 * If removing the interface that gave the bridge its mac address, set 1140 * the mac address of the bridge to the address of the next member, or 1141 * to its default address if no members are left. 1142 */ 1143 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1144 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1145 bcopy(&sc->sc_defaddr, 1146 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1147 sc->sc_ifaddr = NULL; 1148 } else { 1149 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1150 fif = bifl->bif_ifp; 1151 bcopy(IF_LLADDR(fif), 1152 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1153 sc->sc_ifaddr = fif; 1154 } 1155 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1156 } 1157 1158 bridge_linkcheck(sc); 1159 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1160 BRIDGE_RT_LOCK(sc); 1161 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1162 BRIDGE_RT_UNLOCK(sc); 1163 KASSERT(bif->bif_addrcnt == 0, 1164 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1165 1166 ifs->if_bridge_output = NULL; 1167 ifs->if_bridge_input = NULL; 1168 ifs->if_bridge_linkstate = NULL; 1169 if (!gone) { 1170 switch (ifs->if_type) { 1171 case IFT_ETHER: 1172 case IFT_L2VLAN: 1173 /* 1174 * Take the interface out of promiscuous mode, but only 1175 * if it was promiscuous in the first place. It might 1176 * not be if we're in the bridge_ioctl_add() error path. 1177 */ 1178 if (ifs->if_flags & IFF_PROMISC) 1179 (void) ifpromisc(ifs, 0); 1180 break; 1181 1182 case IFT_GIF: 1183 break; 1184 1185 default: 1186 #ifdef DIAGNOSTIC 1187 panic("bridge_delete_member: impossible"); 1188 #endif 1189 break; 1190 } 1191 /* reneable any interface capabilities */ 1192 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1193 } 1194 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1195 1196 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1197 } 1198 1199 /* 1200 * bridge_delete_span: 1201 * 1202 * Delete the specified span interface. 1203 */ 1204 static void 1205 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1206 { 1207 BRIDGE_LOCK_ASSERT(sc); 1208 1209 KASSERT(bif->bif_ifp->if_bridge == NULL, 1210 ("%s: not a span interface", __func__)); 1211 1212 CK_LIST_REMOVE(bif, bif_next); 1213 1214 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1215 } 1216 1217 static int 1218 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1219 { 1220 struct ifbreq *req = arg; 1221 struct bridge_iflist *bif = NULL; 1222 struct ifnet *ifs; 1223 int error = 0; 1224 1225 ifs = ifunit(req->ifbr_ifsname); 1226 if (ifs == NULL) 1227 return (ENOENT); 1228 if (ifs->if_ioctl == NULL) /* must be supported */ 1229 return (EINVAL); 1230 1231 /* If it's in the span list, it can't be a member. */ 1232 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1233 if (ifs == bif->bif_ifp) 1234 return (EBUSY); 1235 1236 if (ifs->if_bridge == sc) 1237 return (EEXIST); 1238 1239 if (ifs->if_bridge != NULL) 1240 return (EBUSY); 1241 1242 switch (ifs->if_type) { 1243 case IFT_ETHER: 1244 case IFT_L2VLAN: 1245 case IFT_GIF: 1246 /* permitted interface types */ 1247 break; 1248 default: 1249 return (EINVAL); 1250 } 1251 1252 #ifdef INET6 1253 /* 1254 * Two valid inet6 addresses with link-local scope must not be 1255 * on the parent interface and the member interfaces at the 1256 * same time. This restriction is needed to prevent violation 1257 * of link-local scope zone. Attempts to add a member 1258 * interface which has inet6 addresses when the parent has 1259 * inet6 triggers removal of all inet6 addresses on the member 1260 * interface. 1261 */ 1262 1263 /* Check if the parent interface has a link-local scope addr. */ 1264 if (V_allow_llz_overlap == 0 && 1265 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1266 /* 1267 * If any, remove all inet6 addresses from the member 1268 * interfaces. 1269 */ 1270 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1271 if (in6ifa_llaonifp(bif->bif_ifp)) { 1272 in6_ifdetach(bif->bif_ifp); 1273 if_printf(sc->sc_ifp, 1274 "IPv6 addresses on %s have been removed " 1275 "before adding it as a member to prevent " 1276 "IPv6 address scope violation.\n", 1277 bif->bif_ifp->if_xname); 1278 } 1279 } 1280 if (in6ifa_llaonifp(ifs)) { 1281 in6_ifdetach(ifs); 1282 if_printf(sc->sc_ifp, 1283 "IPv6 addresses on %s have been removed " 1284 "before adding it as a member to prevent " 1285 "IPv6 address scope violation.\n", 1286 ifs->if_xname); 1287 } 1288 } 1289 #endif 1290 /* Allow the first Ethernet member to define the MTU */ 1291 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1292 sc->sc_ifp->if_mtu = ifs->if_mtu; 1293 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1294 struct ifreq ifr; 1295 1296 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1297 ifs->if_xname); 1298 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1299 1300 error = (*ifs->if_ioctl)(ifs, 1301 SIOCSIFMTU, (caddr_t)&ifr); 1302 if (error != 0) { 1303 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1304 " new member %s\n", sc->sc_ifp->if_xname, 1305 ifr.ifr_mtu, 1306 ifs->if_xname); 1307 return (EINVAL); 1308 } 1309 } 1310 1311 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1312 if (bif == NULL) 1313 return (ENOMEM); 1314 1315 bif->bif_ifp = ifs; 1316 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1317 bif->bif_savedcaps = ifs->if_capenable; 1318 1319 /* 1320 * Assign the interface's MAC address to the bridge if it's the first 1321 * member and the MAC address of the bridge has not been changed from 1322 * the default randomly generated one. 1323 */ 1324 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1325 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1326 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1327 sc->sc_ifaddr = ifs; 1328 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1329 } 1330 1331 ifs->if_bridge = sc; 1332 ifs->if_bridge_output = bridge_output; 1333 ifs->if_bridge_input = bridge_input; 1334 ifs->if_bridge_linkstate = bridge_linkstate; 1335 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1336 /* 1337 * XXX: XLOCK HERE!?! 1338 * 1339 * NOTE: insert_***HEAD*** should be safe for the traversals. 1340 */ 1341 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1342 1343 /* Set interface capabilities to the intersection set of all members */ 1344 bridge_mutecaps(sc); 1345 bridge_linkcheck(sc); 1346 1347 /* Place the interface into promiscuous mode */ 1348 switch (ifs->if_type) { 1349 case IFT_ETHER: 1350 case IFT_L2VLAN: 1351 error = ifpromisc(ifs, 1); 1352 break; 1353 } 1354 1355 if (error) 1356 bridge_delete_member(sc, bif, 0); 1357 return (error); 1358 } 1359 1360 static int 1361 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1362 { 1363 struct ifbreq *req = arg; 1364 struct bridge_iflist *bif; 1365 1366 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1367 if (bif == NULL) 1368 return (ENOENT); 1369 1370 bridge_delete_member(sc, bif, 0); 1371 1372 return (0); 1373 } 1374 1375 static int 1376 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1377 { 1378 struct ifbreq *req = arg; 1379 struct bridge_iflist *bif; 1380 struct bstp_port *bp; 1381 1382 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1383 if (bif == NULL) 1384 return (ENOENT); 1385 1386 bp = &bif->bif_stp; 1387 req->ifbr_ifsflags = bif->bif_flags; 1388 req->ifbr_state = bp->bp_state; 1389 req->ifbr_priority = bp->bp_priority; 1390 req->ifbr_path_cost = bp->bp_path_cost; 1391 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1392 req->ifbr_proto = bp->bp_protover; 1393 req->ifbr_role = bp->bp_role; 1394 req->ifbr_stpflags = bp->bp_flags; 1395 req->ifbr_addrcnt = bif->bif_addrcnt; 1396 req->ifbr_addrmax = bif->bif_addrmax; 1397 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1398 1399 /* Copy STP state options as flags */ 1400 if (bp->bp_operedge) 1401 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1402 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1403 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1404 if (bp->bp_ptp_link) 1405 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1406 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1407 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1408 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1409 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1410 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1411 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1412 return (0); 1413 } 1414 1415 static int 1416 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1417 { 1418 struct epoch_tracker et; 1419 struct ifbreq *req = arg; 1420 struct bridge_iflist *bif; 1421 struct bstp_port *bp; 1422 int error; 1423 1424 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1425 if (bif == NULL) 1426 return (ENOENT); 1427 bp = &bif->bif_stp; 1428 1429 if (req->ifbr_ifsflags & IFBIF_SPAN) 1430 /* SPAN is readonly */ 1431 return (EINVAL); 1432 1433 NET_EPOCH_ENTER(et); 1434 1435 if (req->ifbr_ifsflags & IFBIF_STP) { 1436 if ((bif->bif_flags & IFBIF_STP) == 0) { 1437 error = bstp_enable(&bif->bif_stp); 1438 if (error) { 1439 NET_EPOCH_EXIT(et); 1440 return (error); 1441 } 1442 } 1443 } else { 1444 if ((bif->bif_flags & IFBIF_STP) != 0) 1445 bstp_disable(&bif->bif_stp); 1446 } 1447 1448 /* Pass on STP flags */ 1449 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1450 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1451 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1452 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1453 1454 /* Save the bits relating to the bridge */ 1455 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1456 1457 NET_EPOCH_EXIT(et); 1458 1459 return (0); 1460 } 1461 1462 static int 1463 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1464 { 1465 struct ifbrparam *param = arg; 1466 1467 sc->sc_brtmax = param->ifbrp_csize; 1468 bridge_rttrim(sc); 1469 1470 return (0); 1471 } 1472 1473 static int 1474 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1475 { 1476 struct ifbrparam *param = arg; 1477 1478 param->ifbrp_csize = sc->sc_brtmax; 1479 1480 return (0); 1481 } 1482 1483 static int 1484 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1485 { 1486 struct ifbifconf *bifc = arg; 1487 struct bridge_iflist *bif; 1488 struct ifbreq breq; 1489 char *buf, *outbuf; 1490 int count, buflen, len, error = 0; 1491 1492 count = 0; 1493 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1494 count++; 1495 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1496 count++; 1497 1498 buflen = sizeof(breq) * count; 1499 if (bifc->ifbic_len == 0) { 1500 bifc->ifbic_len = buflen; 1501 return (0); 1502 } 1503 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1504 if (outbuf == NULL) 1505 return (ENOMEM); 1506 1507 count = 0; 1508 buf = outbuf; 1509 len = min(bifc->ifbic_len, buflen); 1510 bzero(&breq, sizeof(breq)); 1511 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1512 if (len < sizeof(breq)) 1513 break; 1514 1515 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1516 sizeof(breq.ifbr_ifsname)); 1517 /* Fill in the ifbreq structure */ 1518 error = bridge_ioctl_gifflags(sc, &breq); 1519 if (error) 1520 break; 1521 memcpy(buf, &breq, sizeof(breq)); 1522 count++; 1523 buf += sizeof(breq); 1524 len -= sizeof(breq); 1525 } 1526 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1527 if (len < sizeof(breq)) 1528 break; 1529 1530 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1531 sizeof(breq.ifbr_ifsname)); 1532 breq.ifbr_ifsflags = bif->bif_flags; 1533 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1534 memcpy(buf, &breq, sizeof(breq)); 1535 count++; 1536 buf += sizeof(breq); 1537 len -= sizeof(breq); 1538 } 1539 1540 bifc->ifbic_len = sizeof(breq) * count; 1541 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1542 free(outbuf, M_TEMP); 1543 return (error); 1544 } 1545 1546 static int 1547 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1548 { 1549 struct ifbaconf *bac = arg; 1550 struct bridge_rtnode *brt; 1551 struct ifbareq bareq; 1552 char *buf, *outbuf; 1553 int count, buflen, len, error = 0; 1554 1555 if (bac->ifbac_len == 0) 1556 return (0); 1557 1558 count = 0; 1559 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1560 count++; 1561 buflen = sizeof(bareq) * count; 1562 1563 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1564 if (outbuf == NULL) 1565 return (ENOMEM); 1566 1567 count = 0; 1568 buf = outbuf; 1569 len = min(bac->ifbac_len, buflen); 1570 bzero(&bareq, sizeof(bareq)); 1571 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1572 if (len < sizeof(bareq)) 1573 goto out; 1574 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1575 sizeof(bareq.ifba_ifsname)); 1576 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1577 bareq.ifba_vlan = brt->brt_vlan; 1578 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1579 time_uptime < brt->brt_expire) 1580 bareq.ifba_expire = brt->brt_expire - time_uptime; 1581 else 1582 bareq.ifba_expire = 0; 1583 bareq.ifba_flags = brt->brt_flags; 1584 1585 memcpy(buf, &bareq, sizeof(bareq)); 1586 count++; 1587 buf += sizeof(bareq); 1588 len -= sizeof(bareq); 1589 } 1590 out: 1591 bac->ifbac_len = sizeof(bareq) * count; 1592 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1593 free(outbuf, M_TEMP); 1594 return (error); 1595 } 1596 1597 static int 1598 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1599 { 1600 struct ifbareq *req = arg; 1601 struct bridge_iflist *bif; 1602 struct epoch_tracker et; 1603 int error; 1604 1605 NET_EPOCH_ENTER(et); 1606 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1607 if (bif == NULL) { 1608 NET_EPOCH_EXIT(et); 1609 return (ENOENT); 1610 } 1611 1612 /* bridge_rtupdate() may acquire the lock. */ 1613 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1614 req->ifba_flags); 1615 NET_EPOCH_EXIT(et); 1616 1617 return (error); 1618 } 1619 1620 static int 1621 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1622 { 1623 struct ifbrparam *param = arg; 1624 1625 sc->sc_brttimeout = param->ifbrp_ctime; 1626 return (0); 1627 } 1628 1629 static int 1630 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1631 { 1632 struct ifbrparam *param = arg; 1633 1634 param->ifbrp_ctime = sc->sc_brttimeout; 1635 return (0); 1636 } 1637 1638 static int 1639 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1640 { 1641 struct ifbareq *req = arg; 1642 1643 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1644 } 1645 1646 static int 1647 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1648 { 1649 struct ifbreq *req = arg; 1650 1651 BRIDGE_RT_LOCK(sc); 1652 bridge_rtflush(sc, req->ifbr_ifsflags); 1653 BRIDGE_RT_UNLOCK(sc); 1654 1655 return (0); 1656 } 1657 1658 static int 1659 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1660 { 1661 struct ifbrparam *param = arg; 1662 struct bstp_state *bs = &sc->sc_stp; 1663 1664 param->ifbrp_prio = bs->bs_bridge_priority; 1665 return (0); 1666 } 1667 1668 static int 1669 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1670 { 1671 struct ifbrparam *param = arg; 1672 1673 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1674 } 1675 1676 static int 1677 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1678 { 1679 struct ifbrparam *param = arg; 1680 struct bstp_state *bs = &sc->sc_stp; 1681 1682 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1683 return (0); 1684 } 1685 1686 static int 1687 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1688 { 1689 struct ifbrparam *param = arg; 1690 1691 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1692 } 1693 1694 static int 1695 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1696 { 1697 struct ifbrparam *param = arg; 1698 struct bstp_state *bs = &sc->sc_stp; 1699 1700 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1701 return (0); 1702 } 1703 1704 static int 1705 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1706 { 1707 struct ifbrparam *param = arg; 1708 1709 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1710 } 1711 1712 static int 1713 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1714 { 1715 struct ifbrparam *param = arg; 1716 struct bstp_state *bs = &sc->sc_stp; 1717 1718 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1719 return (0); 1720 } 1721 1722 static int 1723 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1724 { 1725 struct ifbrparam *param = arg; 1726 1727 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1728 } 1729 1730 static int 1731 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1732 { 1733 struct ifbreq *req = arg; 1734 struct bridge_iflist *bif; 1735 1736 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1737 if (bif == NULL) 1738 return (ENOENT); 1739 1740 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1741 } 1742 1743 static int 1744 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1745 { 1746 struct ifbreq *req = arg; 1747 struct bridge_iflist *bif; 1748 1749 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1750 if (bif == NULL) 1751 return (ENOENT); 1752 1753 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1754 } 1755 1756 static int 1757 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1758 { 1759 struct ifbreq *req = arg; 1760 struct bridge_iflist *bif; 1761 1762 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1763 if (bif == NULL) 1764 return (ENOENT); 1765 1766 bif->bif_addrmax = req->ifbr_addrmax; 1767 return (0); 1768 } 1769 1770 static int 1771 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1772 { 1773 struct ifbreq *req = arg; 1774 struct bridge_iflist *bif = NULL; 1775 struct ifnet *ifs; 1776 1777 ifs = ifunit(req->ifbr_ifsname); 1778 if (ifs == NULL) 1779 return (ENOENT); 1780 1781 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1782 if (ifs == bif->bif_ifp) 1783 return (EBUSY); 1784 1785 if (ifs->if_bridge != NULL) 1786 return (EBUSY); 1787 1788 switch (ifs->if_type) { 1789 case IFT_ETHER: 1790 case IFT_GIF: 1791 case IFT_L2VLAN: 1792 break; 1793 default: 1794 return (EINVAL); 1795 } 1796 1797 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1798 if (bif == NULL) 1799 return (ENOMEM); 1800 1801 bif->bif_ifp = ifs; 1802 bif->bif_flags = IFBIF_SPAN; 1803 1804 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1805 1806 return (0); 1807 } 1808 1809 static int 1810 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1811 { 1812 struct ifbreq *req = arg; 1813 struct bridge_iflist *bif; 1814 struct ifnet *ifs; 1815 1816 ifs = ifunit(req->ifbr_ifsname); 1817 if (ifs == NULL) 1818 return (ENOENT); 1819 1820 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1821 if (ifs == bif->bif_ifp) 1822 break; 1823 1824 if (bif == NULL) 1825 return (ENOENT); 1826 1827 bridge_delete_span(sc, bif); 1828 1829 return (0); 1830 } 1831 1832 static int 1833 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1834 { 1835 struct ifbropreq *req = arg; 1836 struct bstp_state *bs = &sc->sc_stp; 1837 struct bstp_port *root_port; 1838 1839 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1840 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1841 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1842 1843 root_port = bs->bs_root_port; 1844 if (root_port == NULL) 1845 req->ifbop_root_port = 0; 1846 else 1847 req->ifbop_root_port = root_port->bp_ifp->if_index; 1848 1849 req->ifbop_holdcount = bs->bs_txholdcount; 1850 req->ifbop_priority = bs->bs_bridge_priority; 1851 req->ifbop_protocol = bs->bs_protover; 1852 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1853 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1854 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1855 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1856 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1857 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1858 1859 return (0); 1860 } 1861 1862 static int 1863 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1864 { 1865 struct ifbrparam *param = arg; 1866 1867 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1868 return (0); 1869 } 1870 1871 static int 1872 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1873 { 1874 struct ifbpstpconf *bifstp = arg; 1875 struct bridge_iflist *bif; 1876 struct bstp_port *bp; 1877 struct ifbpstpreq bpreq; 1878 char *buf, *outbuf; 1879 int count, buflen, len, error = 0; 1880 1881 count = 0; 1882 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1883 if ((bif->bif_flags & IFBIF_STP) != 0) 1884 count++; 1885 } 1886 1887 buflen = sizeof(bpreq) * count; 1888 if (bifstp->ifbpstp_len == 0) { 1889 bifstp->ifbpstp_len = buflen; 1890 return (0); 1891 } 1892 1893 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1894 if (outbuf == NULL) 1895 return (ENOMEM); 1896 1897 count = 0; 1898 buf = outbuf; 1899 len = min(bifstp->ifbpstp_len, buflen); 1900 bzero(&bpreq, sizeof(bpreq)); 1901 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1902 if (len < sizeof(bpreq)) 1903 break; 1904 1905 if ((bif->bif_flags & IFBIF_STP) == 0) 1906 continue; 1907 1908 bp = &bif->bif_stp; 1909 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1910 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1911 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1912 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1913 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1914 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1915 1916 memcpy(buf, &bpreq, sizeof(bpreq)); 1917 count++; 1918 buf += sizeof(bpreq); 1919 len -= sizeof(bpreq); 1920 } 1921 1922 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1923 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1924 free(outbuf, M_TEMP); 1925 return (error); 1926 } 1927 1928 static int 1929 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1930 { 1931 struct ifbrparam *param = arg; 1932 1933 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1934 } 1935 1936 static int 1937 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1938 { 1939 struct ifbrparam *param = arg; 1940 1941 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1942 } 1943 1944 /* 1945 * bridge_ifdetach: 1946 * 1947 * Detach an interface from a bridge. Called when a member 1948 * interface is detaching. 1949 */ 1950 static void 1951 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1952 { 1953 struct bridge_softc *sc = ifp->if_bridge; 1954 struct bridge_iflist *bif; 1955 1956 if (ifp->if_flags & IFF_RENAMING) 1957 return; 1958 if (V_bridge_cloner == NULL) { 1959 /* 1960 * This detach handler can be called after 1961 * vnet_bridge_uninit(). Just return in that case. 1962 */ 1963 return; 1964 } 1965 /* Check if the interface is a bridge member */ 1966 if (sc != NULL) { 1967 BRIDGE_LOCK(sc); 1968 1969 bif = bridge_lookup_member_if(sc, ifp); 1970 if (bif != NULL) 1971 bridge_delete_member(sc, bif, 1); 1972 1973 BRIDGE_UNLOCK(sc); 1974 return; 1975 } 1976 1977 /* Check if the interface is a span port */ 1978 BRIDGE_LIST_LOCK(); 1979 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1980 BRIDGE_LOCK(sc); 1981 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1982 if (ifp == bif->bif_ifp) { 1983 bridge_delete_span(sc, bif); 1984 break; 1985 } 1986 1987 BRIDGE_UNLOCK(sc); 1988 } 1989 BRIDGE_LIST_UNLOCK(); 1990 } 1991 1992 /* 1993 * bridge_init: 1994 * 1995 * Initialize a bridge interface. 1996 */ 1997 static void 1998 bridge_init(void *xsc) 1999 { 2000 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2001 struct ifnet *ifp = sc->sc_ifp; 2002 2003 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2004 return; 2005 2006 BRIDGE_LOCK(sc); 2007 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2008 bridge_timer, sc); 2009 2010 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2011 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2012 2013 BRIDGE_UNLOCK(sc); 2014 } 2015 2016 /* 2017 * bridge_stop: 2018 * 2019 * Stop the bridge interface. 2020 */ 2021 static void 2022 bridge_stop(struct ifnet *ifp, int disable) 2023 { 2024 struct bridge_softc *sc = ifp->if_softc; 2025 2026 BRIDGE_LOCK_ASSERT(sc); 2027 2028 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2029 return; 2030 2031 BRIDGE_RT_LOCK(sc); 2032 callout_stop(&sc->sc_brcallout); 2033 2034 bstp_stop(&sc->sc_stp); 2035 2036 bridge_rtflush(sc, IFBF_FLUSHDYN); 2037 BRIDGE_RT_UNLOCK(sc); 2038 2039 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2040 } 2041 2042 /* 2043 * bridge_enqueue: 2044 * 2045 * Enqueue a packet on a bridge member interface. 2046 * 2047 */ 2048 static int 2049 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2050 { 2051 int len, err = 0; 2052 short mflags; 2053 struct mbuf *m0; 2054 2055 /* We may be sending a fragment so traverse the mbuf */ 2056 for (; m; m = m0) { 2057 m0 = m->m_nextpkt; 2058 m->m_nextpkt = NULL; 2059 len = m->m_pkthdr.len; 2060 mflags = m->m_flags; 2061 2062 /* 2063 * If underlying interface can not do VLAN tag insertion itself 2064 * then attach a packet tag that holds it. 2065 */ 2066 if ((m->m_flags & M_VLANTAG) && 2067 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2068 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2069 if (m == NULL) { 2070 if_printf(dst_ifp, 2071 "unable to prepend VLAN header\n"); 2072 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2073 continue; 2074 } 2075 m->m_flags &= ~M_VLANTAG; 2076 } 2077 2078 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2079 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2080 int n; 2081 2082 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2083 m0 = m->m_nextpkt; 2084 m_freem(m); 2085 } 2086 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2087 break; 2088 } 2089 2090 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2091 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2092 if (mflags & M_MCAST) 2093 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2094 } 2095 2096 return (err); 2097 } 2098 2099 /* 2100 * bridge_dummynet: 2101 * 2102 * Receive a queued packet from dummynet and pass it on to the output 2103 * interface. 2104 * 2105 * The mbuf has the Ethernet header already attached. 2106 */ 2107 static void 2108 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2109 { 2110 struct bridge_softc *sc; 2111 2112 sc = ifp->if_bridge; 2113 2114 /* 2115 * The packet didnt originate from a member interface. This should only 2116 * ever happen if a member interface is removed while packets are 2117 * queued for it. 2118 */ 2119 if (sc == NULL) { 2120 m_freem(m); 2121 return; 2122 } 2123 2124 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2125 #ifdef INET6 2126 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2127 #endif 2128 ) { 2129 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2130 return; 2131 if (m == NULL) 2132 return; 2133 } 2134 2135 bridge_enqueue(sc, ifp, m); 2136 } 2137 2138 /* 2139 * bridge_output: 2140 * 2141 * Send output from a bridge member interface. This 2142 * performs the bridging function for locally originated 2143 * packets. 2144 * 2145 * The mbuf has the Ethernet header already attached. We must 2146 * enqueue or free the mbuf before returning. 2147 */ 2148 static int 2149 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2150 struct rtentry *rt) 2151 { 2152 struct ether_header *eh; 2153 struct ifnet *bifp, *dst_if; 2154 struct bridge_softc *sc; 2155 uint16_t vlan; 2156 2157 NET_EPOCH_ASSERT(); 2158 2159 if (m->m_len < ETHER_HDR_LEN) { 2160 m = m_pullup(m, ETHER_HDR_LEN); 2161 if (m == NULL) 2162 return (0); 2163 } 2164 2165 eh = mtod(m, struct ether_header *); 2166 sc = ifp->if_bridge; 2167 vlan = VLANTAGOF(m); 2168 2169 bifp = sc->sc_ifp; 2170 2171 /* 2172 * If bridge is down, but the original output interface is up, 2173 * go ahead and send out that interface. Otherwise, the packet 2174 * is dropped below. 2175 */ 2176 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2177 dst_if = ifp; 2178 goto sendunicast; 2179 } 2180 2181 /* 2182 * If the packet is a multicast, or we don't know a better way to 2183 * get there, send to all interfaces. 2184 */ 2185 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2186 dst_if = NULL; 2187 else 2188 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2189 /* Tap any traffic not passing back out the originating interface */ 2190 if (dst_if != ifp) 2191 ETHER_BPF_MTAP(bifp, m); 2192 if (dst_if == NULL) { 2193 struct bridge_iflist *bif; 2194 struct mbuf *mc; 2195 int used = 0; 2196 2197 bridge_span(sc, m); 2198 2199 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2200 dst_if = bif->bif_ifp; 2201 2202 if (dst_if->if_type == IFT_GIF) 2203 continue; 2204 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2205 continue; 2206 2207 /* 2208 * If this is not the original output interface, 2209 * and the interface is participating in spanning 2210 * tree, make sure the port is in a state that 2211 * allows forwarding. 2212 */ 2213 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2214 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2215 continue; 2216 2217 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2218 used = 1; 2219 mc = m; 2220 } else { 2221 mc = m_dup(m, M_NOWAIT); 2222 if (mc == NULL) { 2223 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2224 continue; 2225 } 2226 } 2227 2228 bridge_enqueue(sc, dst_if, mc); 2229 } 2230 if (used == 0) 2231 m_freem(m); 2232 return (0); 2233 } 2234 2235 sendunicast: 2236 /* 2237 * XXX Spanning tree consideration here? 2238 */ 2239 2240 bridge_span(sc, m); 2241 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2242 m_freem(m); 2243 return (0); 2244 } 2245 2246 bridge_enqueue(sc, dst_if, m); 2247 return (0); 2248 } 2249 2250 /* 2251 * bridge_transmit: 2252 * 2253 * Do output on a bridge. 2254 * 2255 */ 2256 static int 2257 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2258 { 2259 struct bridge_softc *sc; 2260 struct ether_header *eh; 2261 struct ifnet *dst_if; 2262 int error = 0; 2263 2264 sc = ifp->if_softc; 2265 2266 ETHER_BPF_MTAP(ifp, m); 2267 2268 eh = mtod(m, struct ether_header *); 2269 2270 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2271 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2272 error = bridge_enqueue(sc, dst_if, m); 2273 } else 2274 bridge_broadcast(sc, ifp, m, 0); 2275 2276 return (error); 2277 } 2278 2279 #ifdef ALTQ 2280 static void 2281 bridge_altq_start(if_t ifp) 2282 { 2283 struct ifaltq *ifq = &ifp->if_snd; 2284 struct mbuf *m; 2285 2286 IFQ_LOCK(ifq); 2287 IFQ_DEQUEUE_NOLOCK(ifq, m); 2288 while (m != NULL) { 2289 bridge_transmit(ifp, m); 2290 IFQ_DEQUEUE_NOLOCK(ifq, m); 2291 } 2292 IFQ_UNLOCK(ifq); 2293 } 2294 2295 static int 2296 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2297 { 2298 int err; 2299 2300 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2301 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2302 if (err == 0) 2303 bridge_altq_start(ifp); 2304 } else 2305 err = bridge_transmit(ifp, m); 2306 2307 return (err); 2308 } 2309 #endif /* ALTQ */ 2310 2311 /* 2312 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2313 */ 2314 static void 2315 bridge_qflush(struct ifnet *ifp __unused) 2316 { 2317 } 2318 2319 /* 2320 * bridge_forward: 2321 * 2322 * The forwarding function of the bridge. 2323 * 2324 * NOTE: Releases the lock on return. 2325 */ 2326 static void 2327 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2328 struct mbuf *m) 2329 { 2330 struct bridge_iflist *dbif; 2331 struct ifnet *src_if, *dst_if, *ifp; 2332 struct ether_header *eh; 2333 uint16_t vlan; 2334 uint8_t *dst; 2335 int error; 2336 2337 NET_EPOCH_ASSERT(); 2338 2339 src_if = m->m_pkthdr.rcvif; 2340 ifp = sc->sc_ifp; 2341 2342 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2343 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2344 vlan = VLANTAGOF(m); 2345 2346 if ((sbif->bif_flags & IFBIF_STP) && 2347 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2348 goto drop; 2349 2350 eh = mtod(m, struct ether_header *); 2351 dst = eh->ether_dhost; 2352 2353 /* If the interface is learning, record the address. */ 2354 if (sbif->bif_flags & IFBIF_LEARNING) { 2355 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2356 sbif, 0, IFBAF_DYNAMIC); 2357 /* 2358 * If the interface has addresses limits then deny any source 2359 * that is not in the cache. 2360 */ 2361 if (error && sbif->bif_addrmax) 2362 goto drop; 2363 } 2364 2365 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2366 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2367 goto drop; 2368 2369 #ifdef DEV_NETMAP 2370 /* 2371 * Hand the packet to netmap only if it wasn't injected by netmap 2372 * itself. 2373 */ 2374 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2375 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2376 ifp->if_input(ifp, m); 2377 return; 2378 } 2379 m->m_flags &= ~M_BRIDGE_INJECT; 2380 #endif 2381 2382 /* 2383 * At this point, the port either doesn't participate 2384 * in spanning tree or it is in the forwarding state. 2385 */ 2386 2387 /* 2388 * If the packet is unicast, destined for someone on 2389 * "this" side of the bridge, drop it. 2390 */ 2391 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2392 dst_if = bridge_rtlookup(sc, dst, vlan); 2393 if (src_if == dst_if) 2394 goto drop; 2395 } else { 2396 /* 2397 * Check if its a reserved multicast address, any address 2398 * listed in 802.1D section 7.12.6 may not be forwarded by the 2399 * bridge. 2400 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2401 */ 2402 if (dst[0] == 0x01 && dst[1] == 0x80 && 2403 dst[2] == 0xc2 && dst[3] == 0x00 && 2404 dst[4] == 0x00 && dst[5] <= 0x0f) 2405 goto drop; 2406 2407 /* ...forward it to all interfaces. */ 2408 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2409 dst_if = NULL; 2410 } 2411 2412 /* 2413 * If we have a destination interface which is a member of our bridge, 2414 * OR this is a unicast packet, push it through the bpf(4) machinery. 2415 * For broadcast or multicast packets, don't bother because it will 2416 * be reinjected into ether_input. We do this before we pass the packets 2417 * through the pfil(9) framework, as it is possible that pfil(9) will 2418 * drop the packet, or possibly modify it, making it difficult to debug 2419 * firewall issues on the bridge. 2420 */ 2421 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2422 ETHER_BPF_MTAP(ifp, m); 2423 2424 /* run the packet filter */ 2425 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2426 #ifdef INET6 2427 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2428 #endif 2429 ) { 2430 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2431 return; 2432 if (m == NULL) 2433 return; 2434 } 2435 2436 if (dst_if == NULL) { 2437 bridge_broadcast(sc, src_if, m, 1); 2438 return; 2439 } 2440 2441 /* 2442 * At this point, we're dealing with a unicast frame 2443 * going to a different interface. 2444 */ 2445 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2446 goto drop; 2447 2448 dbif = bridge_lookup_member_if(sc, dst_if); 2449 if (dbif == NULL) 2450 /* Not a member of the bridge (anymore?) */ 2451 goto drop; 2452 2453 /* Private segments can not talk to each other */ 2454 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2455 goto drop; 2456 2457 if ((dbif->bif_flags & IFBIF_STP) && 2458 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2459 goto drop; 2460 2461 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2462 #ifdef INET6 2463 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2464 #endif 2465 ) { 2466 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2467 return; 2468 if (m == NULL) 2469 return; 2470 } 2471 2472 bridge_enqueue(sc, dst_if, m); 2473 return; 2474 2475 drop: 2476 m_freem(m); 2477 } 2478 2479 /* 2480 * bridge_input: 2481 * 2482 * Receive input from a member interface. Queue the packet for 2483 * bridging if it is not for us. 2484 */ 2485 static struct mbuf * 2486 bridge_input(struct ifnet *ifp, struct mbuf *m) 2487 { 2488 struct bridge_softc *sc; 2489 struct bridge_iflist *bif, *bif2; 2490 struct ifnet *bifp; 2491 struct ether_header *eh; 2492 struct mbuf *mc, *mc2; 2493 uint16_t vlan; 2494 int error; 2495 2496 NET_EPOCH_ASSERT(); 2497 2498 eh = mtod(m, struct ether_header *); 2499 vlan = VLANTAGOF(m); 2500 2501 sc = ifp->if_bridge; 2502 if (sc == NULL) { 2503 /* 2504 * This packet originated from the bridge itself, so it must 2505 * have been transmitted by netmap. Derive the "source" 2506 * interface from the source address and drop the packet if the 2507 * source address isn't known. 2508 */ 2509 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2510 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2511 sc = if_getsoftc(ifp); 2512 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2513 if (ifp == NULL) { 2514 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2515 m_freem(m); 2516 return (NULL); 2517 } 2518 m->m_pkthdr.rcvif = ifp; 2519 } 2520 bifp = sc->sc_ifp; 2521 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2522 return (m); 2523 2524 /* 2525 * Implement support for bridge monitoring. If this flag has been 2526 * set on this interface, discard the packet once we push it through 2527 * the bpf(4) machinery, but before we do, increment the byte and 2528 * packet counters associated with this interface. 2529 */ 2530 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2531 m->m_pkthdr.rcvif = bifp; 2532 ETHER_BPF_MTAP(bifp, m); 2533 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2534 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2535 m_freem(m); 2536 return (NULL); 2537 } 2538 bif = bridge_lookup_member_if(sc, ifp); 2539 if (bif == NULL) { 2540 return (m); 2541 } 2542 2543 bridge_span(sc, m); 2544 2545 if (m->m_flags & (M_BCAST|M_MCAST)) { 2546 /* Tap off 802.1D packets; they do not get forwarded. */ 2547 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2548 ETHER_ADDR_LEN) == 0) { 2549 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2550 return (NULL); 2551 } 2552 2553 if ((bif->bif_flags & IFBIF_STP) && 2554 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2555 return (m); 2556 } 2557 2558 /* 2559 * Make a deep copy of the packet and enqueue the copy 2560 * for bridge processing; return the original packet for 2561 * local processing. 2562 */ 2563 mc = m_dup(m, M_NOWAIT); 2564 if (mc == NULL) { 2565 return (m); 2566 } 2567 2568 /* Perform the bridge forwarding function with the copy. */ 2569 bridge_forward(sc, bif, mc); 2570 2571 #ifdef DEV_NETMAP 2572 /* 2573 * If netmap is enabled and has not already seen this packet, 2574 * then it will be consumed by bridge_forward(). 2575 */ 2576 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2577 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2578 m_freem(m); 2579 return (NULL); 2580 } 2581 #endif 2582 2583 /* 2584 * Reinject the mbuf as arriving on the bridge so we have a 2585 * chance at claiming multicast packets. We can not loop back 2586 * here from ether_input as a bridge is never a member of a 2587 * bridge. 2588 */ 2589 KASSERT(bifp->if_bridge == NULL, 2590 ("loop created in bridge_input")); 2591 mc2 = m_dup(m, M_NOWAIT); 2592 if (mc2 != NULL) { 2593 /* Keep the layer3 header aligned */ 2594 int i = min(mc2->m_pkthdr.len, max_protohdr); 2595 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2596 } 2597 if (mc2 != NULL) { 2598 mc2->m_pkthdr.rcvif = bifp; 2599 mc2->m_flags &= ~M_BRIDGE_INJECT; 2600 sc->sc_if_input(bifp, mc2); 2601 } 2602 2603 /* Return the original packet for local processing. */ 2604 return (m); 2605 } 2606 2607 if ((bif->bif_flags & IFBIF_STP) && 2608 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2609 return (m); 2610 } 2611 2612 #if defined(INET) || defined(INET6) 2613 #define CARP_CHECK_WE_ARE_DST(iface) \ 2614 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 2615 #define CARP_CHECK_WE_ARE_SRC(iface) \ 2616 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 2617 #else 2618 #define CARP_CHECK_WE_ARE_DST(iface) false 2619 #define CARP_CHECK_WE_ARE_SRC(iface) false 2620 #endif 2621 2622 #ifdef INET6 2623 #define PFIL_HOOKED_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 2624 #else 2625 #define PFIL_HOOKED_INET6 false 2626 #endif 2627 2628 #ifdef DEV_NETMAP 2629 #define GRAB_FOR_NETMAP(ifp, m) do { \ 2630 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 2631 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 2632 (ifp)->if_input(ifp, m); \ 2633 return (NULL); \ 2634 } \ 2635 } while (0) 2636 #else 2637 #define GRAB_FOR_NETMAP(ifp, m) 2638 #endif 2639 2640 #define GRAB_OUR_PACKETS(iface) \ 2641 if ((iface)->if_type == IFT_GIF) \ 2642 continue; \ 2643 /* It is destined for us. */ \ 2644 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 2645 CARP_CHECK_WE_ARE_DST(iface)) { \ 2646 if (bif->bif_flags & IFBIF_LEARNING) { \ 2647 error = bridge_rtupdate(sc, eh->ether_shost, \ 2648 vlan, bif, 0, IFBAF_DYNAMIC); \ 2649 if (error && bif->bif_addrmax) { \ 2650 m_freem(m); \ 2651 return (NULL); \ 2652 } \ 2653 } \ 2654 m->m_pkthdr.rcvif = iface; \ 2655 if ((iface) == ifp) { \ 2656 /* Skip bridge processing... src == dest */ \ 2657 return (m); \ 2658 } \ 2659 /* It's passing over or to the bridge, locally. */ \ 2660 ETHER_BPF_MTAP(bifp, m); \ 2661 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2662 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 2663 /* Hand the packet over to netmap if necessary. */ \ 2664 GRAB_FOR_NETMAP(bifp, m); \ 2665 /* Filter on the physical interface. */ \ 2666 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) || \ 2667 PFIL_HOOKED_INET6)) { \ 2668 if (bridge_pfil(&m, NULL, ifp, \ 2669 PFIL_IN) != 0 || m == NULL) { \ 2670 return (NULL); \ 2671 } \ 2672 } \ 2673 if ((iface) != bifp) \ 2674 ETHER_BPF_MTAP(iface, m); \ 2675 return (m); \ 2676 } \ 2677 \ 2678 /* We just received a packet that we sent out. */ \ 2679 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 2680 CARP_CHECK_WE_ARE_SRC(iface)) { \ 2681 m_freem(m); \ 2682 return (NULL); \ 2683 } 2684 2685 /* 2686 * Unicast. Make sure it's not for the bridge. 2687 */ 2688 do { GRAB_OUR_PACKETS(bifp) } while (0); 2689 2690 /* 2691 * Give a chance for ifp at first priority. This will help when the 2692 * packet comes through the interface like VLAN's with the same MACs 2693 * on several interfaces from the same bridge. This also will save 2694 * some CPU cycles in case the destination interface and the input 2695 * interface (eq ifp) are the same. 2696 */ 2697 do { GRAB_OUR_PACKETS(ifp) } while (0); 2698 2699 /* Now check the all bridge members. */ 2700 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2701 GRAB_OUR_PACKETS(bif2->bif_ifp) 2702 } 2703 2704 #undef CARP_CHECK_WE_ARE_DST 2705 #undef CARP_CHECK_WE_ARE_SRC 2706 #undef PFIL_HOOKED_INET6 2707 #undef GRAB_FOR_NETMAP 2708 #undef GRAB_OUR_PACKETS 2709 2710 /* Perform the bridge forwarding function. */ 2711 bridge_forward(sc, bif, m); 2712 2713 return (NULL); 2714 } 2715 2716 /* 2717 * Inject a packet back into the host ethernet stack. This will generally only 2718 * be used by netmap when an application writes to the host TX ring. The 2719 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 2720 * interface after ethernet processing. 2721 */ 2722 static void 2723 bridge_inject(struct ifnet *ifp, struct mbuf *m) 2724 { 2725 struct bridge_softc *sc; 2726 2727 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 2728 ("%s: iface %s is not running in netmap mode", 2729 __func__, if_name(ifp))); 2730 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 2731 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 2732 2733 m->m_flags |= M_BRIDGE_INJECT; 2734 sc = if_getsoftc(ifp); 2735 sc->sc_if_input(ifp, m); 2736 } 2737 2738 /* 2739 * bridge_broadcast: 2740 * 2741 * Send a frame to all interfaces that are members of 2742 * the bridge, except for the one on which the packet 2743 * arrived. 2744 * 2745 * NOTE: Releases the lock on return. 2746 */ 2747 static void 2748 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2749 struct mbuf *m, int runfilt) 2750 { 2751 struct bridge_iflist *dbif, *sbif; 2752 struct mbuf *mc; 2753 struct ifnet *dst_if; 2754 int used = 0, i; 2755 2756 NET_EPOCH_ASSERT(); 2757 2758 sbif = bridge_lookup_member_if(sc, src_if); 2759 2760 /* Filter on the bridge interface before broadcasting */ 2761 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2762 #ifdef INET6 2763 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2764 #endif 2765 )) { 2766 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2767 return; 2768 if (m == NULL) 2769 return; 2770 } 2771 2772 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2773 dst_if = dbif->bif_ifp; 2774 if (dst_if == src_if) 2775 continue; 2776 2777 /* Private segments can not talk to each other */ 2778 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2779 continue; 2780 2781 if ((dbif->bif_flags & IFBIF_STP) && 2782 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2783 continue; 2784 2785 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2786 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2787 continue; 2788 2789 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2790 continue; 2791 2792 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2793 mc = m; 2794 used = 1; 2795 } else { 2796 mc = m_dup(m, M_NOWAIT); 2797 if (mc == NULL) { 2798 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2799 continue; 2800 } 2801 } 2802 2803 /* 2804 * Filter on the output interface. Pass a NULL bridge interface 2805 * pointer so we do not redundantly filter on the bridge for 2806 * each interface we broadcast on. 2807 */ 2808 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2809 #ifdef INET6 2810 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2811 #endif 2812 )) { 2813 if (used == 0) { 2814 /* Keep the layer3 header aligned */ 2815 i = min(mc->m_pkthdr.len, max_protohdr); 2816 mc = m_copyup(mc, i, ETHER_ALIGN); 2817 if (mc == NULL) { 2818 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2819 continue; 2820 } 2821 } 2822 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2823 continue; 2824 if (mc == NULL) 2825 continue; 2826 } 2827 2828 bridge_enqueue(sc, dst_if, mc); 2829 } 2830 if (used == 0) 2831 m_freem(m); 2832 } 2833 2834 /* 2835 * bridge_span: 2836 * 2837 * Duplicate a packet out one or more interfaces that are in span mode, 2838 * the original mbuf is unmodified. 2839 */ 2840 static void 2841 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2842 { 2843 struct bridge_iflist *bif; 2844 struct ifnet *dst_if; 2845 struct mbuf *mc; 2846 2847 NET_EPOCH_ASSERT(); 2848 2849 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2850 return; 2851 2852 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2853 dst_if = bif->bif_ifp; 2854 2855 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2856 continue; 2857 2858 mc = m_dup(m, M_NOWAIT); 2859 if (mc == NULL) { 2860 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2861 continue; 2862 } 2863 2864 bridge_enqueue(sc, dst_if, mc); 2865 } 2866 } 2867 2868 /* 2869 * bridge_rtupdate: 2870 * 2871 * Add a bridge routing entry. 2872 */ 2873 static int 2874 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2875 struct bridge_iflist *bif, int setflags, uint8_t flags) 2876 { 2877 struct bridge_rtnode *brt; 2878 struct bridge_iflist *obif; 2879 int error; 2880 2881 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2882 2883 /* Check the source address is valid and not multicast. */ 2884 if (ETHER_IS_MULTICAST(dst) || 2885 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2886 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2887 return (EINVAL); 2888 2889 /* 802.1p frames map to vlan 1 */ 2890 if (vlan == 0) 2891 vlan = 1; 2892 2893 /* 2894 * A route for this destination might already exist. If so, 2895 * update it, otherwise create a new one. 2896 */ 2897 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2898 BRIDGE_RT_LOCK(sc); 2899 2900 /* Check again, now that we have the lock. There could have 2901 * been a race and we only want to insert this once. */ 2902 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 2903 BRIDGE_RT_UNLOCK(sc); 2904 return (0); 2905 } 2906 2907 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2908 sc->sc_brtexceeded++; 2909 BRIDGE_RT_UNLOCK(sc); 2910 return (ENOSPC); 2911 } 2912 /* Check per interface address limits (if enabled) */ 2913 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2914 bif->bif_addrexceeded++; 2915 BRIDGE_RT_UNLOCK(sc); 2916 return (ENOSPC); 2917 } 2918 2919 /* 2920 * Allocate a new bridge forwarding node, and 2921 * initialize the expiration time and Ethernet 2922 * address. 2923 */ 2924 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2925 if (brt == NULL) { 2926 BRIDGE_RT_UNLOCK(sc); 2927 return (ENOMEM); 2928 } 2929 brt->brt_vnet = curvnet; 2930 2931 if (bif->bif_flags & IFBIF_STICKY) 2932 brt->brt_flags = IFBAF_STICKY; 2933 else 2934 brt->brt_flags = IFBAF_DYNAMIC; 2935 2936 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2937 brt->brt_vlan = vlan; 2938 2939 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2940 uma_zfree(V_bridge_rtnode_zone, brt); 2941 BRIDGE_RT_UNLOCK(sc); 2942 return (error); 2943 } 2944 brt->brt_dst = bif; 2945 bif->bif_addrcnt++; 2946 2947 BRIDGE_RT_UNLOCK(sc); 2948 } 2949 2950 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2951 (obif = brt->brt_dst) != bif) { 2952 BRIDGE_RT_LOCK(sc); 2953 brt->brt_dst->bif_addrcnt--; 2954 brt->brt_dst = bif; 2955 brt->brt_dst->bif_addrcnt++; 2956 BRIDGE_RT_UNLOCK(sc); 2957 2958 if (V_log_mac_flap && 2959 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 2960 uint8_t *addr = &brt->brt_addr[0]; 2961 log(LOG_NOTICE, 2962 "%s: mac address %02x:%02x:%02x:%02x:%02x:%02x vlan %d moved from %s to %s\n", 2963 sc->sc_ifp->if_xname, 2964 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], 2965 brt->brt_vlan, 2966 obif->bif_ifp->if_xname, 2967 bif->bif_ifp->if_xname); 2968 } 2969 } 2970 2971 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2972 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2973 if (setflags) 2974 brt->brt_flags = flags; 2975 2976 return (0); 2977 } 2978 2979 /* 2980 * bridge_rtlookup: 2981 * 2982 * Lookup the destination interface for an address. 2983 */ 2984 static struct ifnet * 2985 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2986 { 2987 struct bridge_rtnode *brt; 2988 2989 NET_EPOCH_ASSERT(); 2990 2991 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2992 return (NULL); 2993 2994 return (brt->brt_ifp); 2995 } 2996 2997 /* 2998 * bridge_rttrim: 2999 * 3000 * Trim the routine table so that we have a number 3001 * of routing entries less than or equal to the 3002 * maximum number. 3003 */ 3004 static void 3005 bridge_rttrim(struct bridge_softc *sc) 3006 { 3007 struct bridge_rtnode *brt, *nbrt; 3008 3009 NET_EPOCH_ASSERT(); 3010 BRIDGE_RT_LOCK_ASSERT(sc); 3011 3012 /* Make sure we actually need to do this. */ 3013 if (sc->sc_brtcnt <= sc->sc_brtmax) 3014 return; 3015 3016 /* Force an aging cycle; this might trim enough addresses. */ 3017 bridge_rtage(sc); 3018 if (sc->sc_brtcnt <= sc->sc_brtmax) 3019 return; 3020 3021 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3022 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3023 bridge_rtnode_destroy(sc, brt); 3024 if (sc->sc_brtcnt <= sc->sc_brtmax) 3025 return; 3026 } 3027 } 3028 } 3029 3030 /* 3031 * bridge_timer: 3032 * 3033 * Aging timer for the bridge. 3034 */ 3035 static void 3036 bridge_timer(void *arg) 3037 { 3038 struct bridge_softc *sc = arg; 3039 3040 BRIDGE_RT_LOCK_ASSERT(sc); 3041 3042 /* Destruction of rtnodes requires a proper vnet context */ 3043 CURVNET_SET(sc->sc_ifp->if_vnet); 3044 bridge_rtage(sc); 3045 3046 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3047 callout_reset(&sc->sc_brcallout, 3048 bridge_rtable_prune_period * hz, bridge_timer, sc); 3049 CURVNET_RESTORE(); 3050 } 3051 3052 /* 3053 * bridge_rtage: 3054 * 3055 * Perform an aging cycle. 3056 */ 3057 static void 3058 bridge_rtage(struct bridge_softc *sc) 3059 { 3060 struct bridge_rtnode *brt, *nbrt; 3061 3062 BRIDGE_RT_LOCK_ASSERT(sc); 3063 3064 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3065 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3066 if (time_uptime >= brt->brt_expire) 3067 bridge_rtnode_destroy(sc, brt); 3068 } 3069 } 3070 } 3071 3072 /* 3073 * bridge_rtflush: 3074 * 3075 * Remove all dynamic addresses from the bridge. 3076 */ 3077 static void 3078 bridge_rtflush(struct bridge_softc *sc, int full) 3079 { 3080 struct bridge_rtnode *brt, *nbrt; 3081 3082 BRIDGE_RT_LOCK_ASSERT(sc); 3083 3084 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3085 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3086 bridge_rtnode_destroy(sc, brt); 3087 } 3088 } 3089 3090 /* 3091 * bridge_rtdaddr: 3092 * 3093 * Remove an address from the table. 3094 */ 3095 static int 3096 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3097 { 3098 struct bridge_rtnode *brt; 3099 int found = 0; 3100 3101 BRIDGE_RT_LOCK(sc); 3102 3103 /* 3104 * If vlan is zero then we want to delete for all vlans so the lookup 3105 * may return more than one. 3106 */ 3107 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3108 bridge_rtnode_destroy(sc, brt); 3109 found = 1; 3110 } 3111 3112 BRIDGE_RT_UNLOCK(sc); 3113 3114 return (found ? 0 : ENOENT); 3115 } 3116 3117 /* 3118 * bridge_rtdelete: 3119 * 3120 * Delete routes to a speicifc member interface. 3121 */ 3122 static void 3123 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3124 { 3125 struct bridge_rtnode *brt, *nbrt; 3126 3127 BRIDGE_RT_LOCK_ASSERT(sc); 3128 3129 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3130 if (brt->brt_ifp == ifp && (full || 3131 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3132 bridge_rtnode_destroy(sc, brt); 3133 } 3134 } 3135 3136 /* 3137 * bridge_rtable_init: 3138 * 3139 * Initialize the route table for this bridge. 3140 */ 3141 static void 3142 bridge_rtable_init(struct bridge_softc *sc) 3143 { 3144 int i; 3145 3146 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3147 M_DEVBUF, M_WAITOK); 3148 3149 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3150 CK_LIST_INIT(&sc->sc_rthash[i]); 3151 3152 sc->sc_rthash_key = arc4random(); 3153 CK_LIST_INIT(&sc->sc_rtlist); 3154 } 3155 3156 /* 3157 * bridge_rtable_fini: 3158 * 3159 * Deconstruct the route table for this bridge. 3160 */ 3161 static void 3162 bridge_rtable_fini(struct bridge_softc *sc) 3163 { 3164 3165 KASSERT(sc->sc_brtcnt == 0, 3166 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3167 free(sc->sc_rthash, M_DEVBUF); 3168 } 3169 3170 /* 3171 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3172 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3173 */ 3174 #define mix(a, b, c) \ 3175 do { \ 3176 a -= b; a -= c; a ^= (c >> 13); \ 3177 b -= c; b -= a; b ^= (a << 8); \ 3178 c -= a; c -= b; c ^= (b >> 13); \ 3179 a -= b; a -= c; a ^= (c >> 12); \ 3180 b -= c; b -= a; b ^= (a << 16); \ 3181 c -= a; c -= b; c ^= (b >> 5); \ 3182 a -= b; a -= c; a ^= (c >> 3); \ 3183 b -= c; b -= a; b ^= (a << 10); \ 3184 c -= a; c -= b; c ^= (b >> 15); \ 3185 } while (/*CONSTCOND*/0) 3186 3187 static __inline uint32_t 3188 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3189 { 3190 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3191 3192 b += addr[5] << 8; 3193 b += addr[4]; 3194 a += addr[3] << 24; 3195 a += addr[2] << 16; 3196 a += addr[1] << 8; 3197 a += addr[0]; 3198 3199 mix(a, b, c); 3200 3201 return (c & BRIDGE_RTHASH_MASK); 3202 } 3203 3204 #undef mix 3205 3206 static int 3207 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3208 { 3209 int i, d; 3210 3211 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3212 d = ((int)a[i]) - ((int)b[i]); 3213 } 3214 3215 return (d); 3216 } 3217 3218 /* 3219 * bridge_rtnode_lookup: 3220 * 3221 * Look up a bridge route node for the specified destination. Compare the 3222 * vlan id or if zero then just return the first match. 3223 */ 3224 static struct bridge_rtnode * 3225 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3226 { 3227 struct bridge_rtnode *brt; 3228 uint32_t hash; 3229 int dir; 3230 3231 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3232 3233 hash = bridge_rthash(sc, addr); 3234 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3235 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3236 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3237 return (brt); 3238 if (dir > 0) 3239 return (NULL); 3240 } 3241 3242 return (NULL); 3243 } 3244 3245 /* 3246 * bridge_rtnode_insert: 3247 * 3248 * Insert the specified bridge node into the route table. We 3249 * assume the entry is not already in the table. 3250 */ 3251 static int 3252 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3253 { 3254 struct bridge_rtnode *lbrt; 3255 uint32_t hash; 3256 int dir; 3257 3258 BRIDGE_RT_LOCK_ASSERT(sc); 3259 3260 hash = bridge_rthash(sc, brt->brt_addr); 3261 3262 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3263 if (lbrt == NULL) { 3264 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3265 goto out; 3266 } 3267 3268 do { 3269 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3270 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3271 return (EEXIST); 3272 if (dir > 0) { 3273 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3274 goto out; 3275 } 3276 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3277 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3278 goto out; 3279 } 3280 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3281 } while (lbrt != NULL); 3282 3283 #ifdef DIAGNOSTIC 3284 panic("bridge_rtnode_insert: impossible"); 3285 #endif 3286 3287 out: 3288 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3289 sc->sc_brtcnt++; 3290 3291 return (0); 3292 } 3293 3294 static void 3295 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3296 { 3297 struct bridge_rtnode *brt; 3298 3299 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3300 3301 CURVNET_SET(brt->brt_vnet); 3302 uma_zfree(V_bridge_rtnode_zone, brt); 3303 CURVNET_RESTORE(); 3304 } 3305 3306 /* 3307 * bridge_rtnode_destroy: 3308 * 3309 * Destroy a bridge rtnode. 3310 */ 3311 static void 3312 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3313 { 3314 BRIDGE_RT_LOCK_ASSERT(sc); 3315 3316 CK_LIST_REMOVE(brt, brt_hash); 3317 3318 CK_LIST_REMOVE(brt, brt_list); 3319 sc->sc_brtcnt--; 3320 brt->brt_dst->bif_addrcnt--; 3321 3322 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3323 } 3324 3325 /* 3326 * bridge_rtable_expire: 3327 * 3328 * Set the expiry time for all routes on an interface. 3329 */ 3330 static void 3331 bridge_rtable_expire(struct ifnet *ifp, int age) 3332 { 3333 struct bridge_softc *sc = ifp->if_bridge; 3334 struct bridge_rtnode *brt; 3335 3336 CURVNET_SET(ifp->if_vnet); 3337 BRIDGE_RT_LOCK(sc); 3338 3339 /* 3340 * If the age is zero then flush, otherwise set all the expiry times to 3341 * age for the interface 3342 */ 3343 if (age == 0) 3344 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3345 else { 3346 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3347 /* Cap the expiry time to 'age' */ 3348 if (brt->brt_ifp == ifp && 3349 brt->brt_expire > time_uptime + age && 3350 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3351 brt->brt_expire = time_uptime + age; 3352 } 3353 } 3354 BRIDGE_RT_UNLOCK(sc); 3355 CURVNET_RESTORE(); 3356 } 3357 3358 /* 3359 * bridge_state_change: 3360 * 3361 * Callback from the bridgestp code when a port changes states. 3362 */ 3363 static void 3364 bridge_state_change(struct ifnet *ifp, int state) 3365 { 3366 struct bridge_softc *sc = ifp->if_bridge; 3367 static const char *stpstates[] = { 3368 "disabled", 3369 "listening", 3370 "learning", 3371 "forwarding", 3372 "blocking", 3373 "discarding" 3374 }; 3375 3376 CURVNET_SET(ifp->if_vnet); 3377 if (V_log_stp) 3378 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3379 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3380 CURVNET_RESTORE(); 3381 } 3382 3383 /* 3384 * Send bridge packets through pfil if they are one of the types pfil can deal 3385 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3386 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3387 * that interface. 3388 */ 3389 static int 3390 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3391 { 3392 int snap, error, i, hlen; 3393 struct ether_header *eh1, eh2; 3394 struct ip *ip; 3395 struct llc llc1; 3396 u_int16_t ether_type; 3397 pfil_return_t rv; 3398 3399 snap = 0; 3400 error = -1; /* Default error if not error == 0 */ 3401 3402 #if 0 3403 /* we may return with the IP fields swapped, ensure its not shared */ 3404 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3405 #endif 3406 3407 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3408 return (0); /* filtering is disabled */ 3409 3410 i = min((*mp)->m_pkthdr.len, max_protohdr); 3411 if ((*mp)->m_len < i) { 3412 *mp = m_pullup(*mp, i); 3413 if (*mp == NULL) { 3414 printf("%s: m_pullup failed\n", __func__); 3415 return (-1); 3416 } 3417 } 3418 3419 eh1 = mtod(*mp, struct ether_header *); 3420 ether_type = ntohs(eh1->ether_type); 3421 3422 /* 3423 * Check for SNAP/LLC. 3424 */ 3425 if (ether_type < ETHERMTU) { 3426 struct llc *llc2 = (struct llc *)(eh1 + 1); 3427 3428 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3429 llc2->llc_dsap == LLC_SNAP_LSAP && 3430 llc2->llc_ssap == LLC_SNAP_LSAP && 3431 llc2->llc_control == LLC_UI) { 3432 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3433 snap = 1; 3434 } 3435 } 3436 3437 /* 3438 * If we're trying to filter bridge traffic, don't look at anything 3439 * other than IP and ARP traffic. If the filter doesn't understand 3440 * IPv6, don't allow IPv6 through the bridge either. This is lame 3441 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3442 * but of course we don't have an AppleTalk filter to begin with. 3443 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3444 * ARP traffic.) 3445 */ 3446 switch (ether_type) { 3447 case ETHERTYPE_ARP: 3448 case ETHERTYPE_REVARP: 3449 if (V_pfil_ipfw_arp == 0) 3450 return (0); /* Automatically pass */ 3451 break; 3452 3453 case ETHERTYPE_IP: 3454 #ifdef INET6 3455 case ETHERTYPE_IPV6: 3456 #endif /* INET6 */ 3457 break; 3458 default: 3459 /* 3460 * Check to see if the user wants to pass non-ip 3461 * packets, these will not be checked by pfil(9) and 3462 * passed unconditionally so the default is to drop. 3463 */ 3464 if (V_pfil_onlyip) 3465 goto bad; 3466 } 3467 3468 /* Run the packet through pfil before stripping link headers */ 3469 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3470 dir == PFIL_OUT && ifp != NULL) { 3471 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 3472 case PFIL_DROPPED: 3473 return (EACCES); 3474 case PFIL_CONSUMED: 3475 return (0); 3476 } 3477 } 3478 3479 /* Strip off the Ethernet header and keep a copy. */ 3480 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3481 m_adj(*mp, ETHER_HDR_LEN); 3482 3483 /* Strip off snap header, if present */ 3484 if (snap) { 3485 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3486 m_adj(*mp, sizeof(struct llc)); 3487 } 3488 3489 /* 3490 * Check the IP header for alignment and errors 3491 */ 3492 if (dir == PFIL_IN) { 3493 switch (ether_type) { 3494 case ETHERTYPE_IP: 3495 error = bridge_ip_checkbasic(mp); 3496 break; 3497 #ifdef INET6 3498 case ETHERTYPE_IPV6: 3499 error = bridge_ip6_checkbasic(mp); 3500 break; 3501 #endif /* INET6 */ 3502 default: 3503 error = 0; 3504 } 3505 if (error) 3506 goto bad; 3507 } 3508 3509 error = 0; 3510 3511 /* 3512 * Run the packet through pfil 3513 */ 3514 rv = PFIL_PASS; 3515 switch (ether_type) { 3516 case ETHERTYPE_IP: 3517 /* 3518 * Run pfil on the member interface and the bridge, both can 3519 * be skipped by clearing pfil_member or pfil_bridge. 3520 * 3521 * Keep the order: 3522 * in_if -> bridge_if -> out_if 3523 */ 3524 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3525 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 3526 PFIL_PASS) 3527 break; 3528 3529 if (V_pfil_member && ifp != NULL) { 3530 rv = (dir == PFIL_OUT) ? 3531 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 3532 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 3533 if (rv != PFIL_PASS) 3534 break; 3535 } 3536 3537 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3538 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 3539 PFIL_PASS) 3540 break; 3541 3542 /* check if we need to fragment the packet */ 3543 /* bridge_fragment generates a mbuf chain of packets */ 3544 /* that already include eth headers */ 3545 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3546 i = (*mp)->m_pkthdr.len; 3547 if (i > ifp->if_mtu) { 3548 error = bridge_fragment(ifp, mp, &eh2, snap, 3549 &llc1); 3550 return (error); 3551 } 3552 } 3553 3554 /* Recalculate the ip checksum. */ 3555 ip = mtod(*mp, struct ip *); 3556 hlen = ip->ip_hl << 2; 3557 if (hlen < sizeof(struct ip)) 3558 goto bad; 3559 if (hlen > (*mp)->m_len) { 3560 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3561 goto bad; 3562 ip = mtod(*mp, struct ip *); 3563 if (ip == NULL) 3564 goto bad; 3565 } 3566 ip->ip_sum = 0; 3567 if (hlen == sizeof(struct ip)) 3568 ip->ip_sum = in_cksum_hdr(ip); 3569 else 3570 ip->ip_sum = in_cksum(*mp, hlen); 3571 3572 break; 3573 #ifdef INET6 3574 case ETHERTYPE_IPV6: 3575 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3576 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 3577 PFIL_PASS) 3578 break; 3579 3580 if (V_pfil_member && ifp != NULL) { 3581 rv = (dir == PFIL_OUT) ? 3582 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 3583 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 3584 if (rv != PFIL_PASS) 3585 break; 3586 } 3587 3588 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3589 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 3590 PFIL_PASS) 3591 break; 3592 break; 3593 #endif 3594 } 3595 3596 switch (rv) { 3597 case PFIL_CONSUMED: 3598 return (0); 3599 case PFIL_DROPPED: 3600 return (EACCES); 3601 default: 3602 break; 3603 } 3604 3605 error = -1; 3606 3607 /* 3608 * Finally, put everything back the way it was and return 3609 */ 3610 if (snap) { 3611 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3612 if (*mp == NULL) 3613 return (error); 3614 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3615 } 3616 3617 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3618 if (*mp == NULL) 3619 return (error); 3620 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3621 3622 return (0); 3623 3624 bad: 3625 m_freem(*mp); 3626 *mp = NULL; 3627 return (error); 3628 } 3629 3630 /* 3631 * Perform basic checks on header size since 3632 * pfil assumes ip_input has already processed 3633 * it for it. Cut-and-pasted from ip_input.c. 3634 * Given how simple the IPv6 version is, 3635 * does the IPv4 version really need to be 3636 * this complicated? 3637 * 3638 * XXX Should we update ipstat here, or not? 3639 * XXX Right now we update ipstat but not 3640 * XXX csum_counter. 3641 */ 3642 static int 3643 bridge_ip_checkbasic(struct mbuf **mp) 3644 { 3645 struct mbuf *m = *mp; 3646 struct ip *ip; 3647 int len, hlen; 3648 u_short sum; 3649 3650 if (*mp == NULL) 3651 return (-1); 3652 3653 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3654 if ((m = m_copyup(m, sizeof(struct ip), 3655 (max_linkhdr + 3) & ~3)) == NULL) { 3656 /* XXXJRT new stat, please */ 3657 KMOD_IPSTAT_INC(ips_toosmall); 3658 goto bad; 3659 } 3660 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3661 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3662 KMOD_IPSTAT_INC(ips_toosmall); 3663 goto bad; 3664 } 3665 } 3666 ip = mtod(m, struct ip *); 3667 if (ip == NULL) goto bad; 3668 3669 if (ip->ip_v != IPVERSION) { 3670 KMOD_IPSTAT_INC(ips_badvers); 3671 goto bad; 3672 } 3673 hlen = ip->ip_hl << 2; 3674 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3675 KMOD_IPSTAT_INC(ips_badhlen); 3676 goto bad; 3677 } 3678 if (hlen > m->m_len) { 3679 if ((m = m_pullup(m, hlen)) == NULL) { 3680 KMOD_IPSTAT_INC(ips_badhlen); 3681 goto bad; 3682 } 3683 ip = mtod(m, struct ip *); 3684 if (ip == NULL) goto bad; 3685 } 3686 3687 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3688 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3689 } else { 3690 if (hlen == sizeof(struct ip)) { 3691 sum = in_cksum_hdr(ip); 3692 } else { 3693 sum = in_cksum(m, hlen); 3694 } 3695 } 3696 if (sum) { 3697 KMOD_IPSTAT_INC(ips_badsum); 3698 goto bad; 3699 } 3700 3701 /* Retrieve the packet length. */ 3702 len = ntohs(ip->ip_len); 3703 3704 /* 3705 * Check for additional length bogosity 3706 */ 3707 if (len < hlen) { 3708 KMOD_IPSTAT_INC(ips_badlen); 3709 goto bad; 3710 } 3711 3712 /* 3713 * Check that the amount of data in the buffers 3714 * is as at least much as the IP header would have us expect. 3715 * Drop packet if shorter than we expect. 3716 */ 3717 if (m->m_pkthdr.len < len) { 3718 KMOD_IPSTAT_INC(ips_tooshort); 3719 goto bad; 3720 } 3721 3722 /* Checks out, proceed */ 3723 *mp = m; 3724 return (0); 3725 3726 bad: 3727 *mp = m; 3728 return (-1); 3729 } 3730 3731 #ifdef INET6 3732 /* 3733 * Same as above, but for IPv6. 3734 * Cut-and-pasted from ip6_input.c. 3735 * XXX Should we update ip6stat, or not? 3736 */ 3737 static int 3738 bridge_ip6_checkbasic(struct mbuf **mp) 3739 { 3740 struct mbuf *m = *mp; 3741 struct ip6_hdr *ip6; 3742 3743 /* 3744 * If the IPv6 header is not aligned, slurp it up into a new 3745 * mbuf with space for link headers, in the event we forward 3746 * it. Otherwise, if it is aligned, make sure the entire base 3747 * IPv6 header is in the first mbuf of the chain. 3748 */ 3749 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3750 struct ifnet *inifp = m->m_pkthdr.rcvif; 3751 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3752 (max_linkhdr + 3) & ~3)) == NULL) { 3753 /* XXXJRT new stat, please */ 3754 IP6STAT_INC(ip6s_toosmall); 3755 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3756 goto bad; 3757 } 3758 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3759 struct ifnet *inifp = m->m_pkthdr.rcvif; 3760 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3761 IP6STAT_INC(ip6s_toosmall); 3762 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3763 goto bad; 3764 } 3765 } 3766 3767 ip6 = mtod(m, struct ip6_hdr *); 3768 3769 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3770 IP6STAT_INC(ip6s_badvers); 3771 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3772 goto bad; 3773 } 3774 3775 /* Checks out, proceed */ 3776 *mp = m; 3777 return (0); 3778 3779 bad: 3780 *mp = m; 3781 return (-1); 3782 } 3783 #endif /* INET6 */ 3784 3785 /* 3786 * bridge_fragment: 3787 * 3788 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3789 */ 3790 static int 3791 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3792 int snap, struct llc *llc) 3793 { 3794 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3795 struct ip *ip; 3796 int error = -1; 3797 3798 if (m->m_len < sizeof(struct ip) && 3799 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3800 goto dropit; 3801 ip = mtod(m, struct ip *); 3802 3803 m->m_pkthdr.csum_flags |= CSUM_IP; 3804 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3805 if (error) 3806 goto dropit; 3807 3808 /* 3809 * Walk the chain and re-add the Ethernet header for 3810 * each mbuf packet. 3811 */ 3812 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3813 nextpkt = mcur->m_nextpkt; 3814 mcur->m_nextpkt = NULL; 3815 if (snap) { 3816 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3817 if (mcur == NULL) { 3818 error = ENOBUFS; 3819 if (mprev != NULL) 3820 mprev->m_nextpkt = nextpkt; 3821 goto dropit; 3822 } 3823 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3824 } 3825 3826 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3827 if (mcur == NULL) { 3828 error = ENOBUFS; 3829 if (mprev != NULL) 3830 mprev->m_nextpkt = nextpkt; 3831 goto dropit; 3832 } 3833 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3834 3835 /* 3836 * The previous two M_PREPEND could have inserted one or two 3837 * mbufs in front so we have to update the previous packet's 3838 * m_nextpkt. 3839 */ 3840 mcur->m_nextpkt = nextpkt; 3841 if (mprev != NULL) 3842 mprev->m_nextpkt = mcur; 3843 else { 3844 /* The first mbuf in the original chain needs to be 3845 * updated. */ 3846 *mp = mcur; 3847 } 3848 mprev = mcur; 3849 } 3850 3851 KMOD_IPSTAT_INC(ips_fragmented); 3852 return (error); 3853 3854 dropit: 3855 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3856 m = mcur->m_nextpkt; 3857 m_freem(mcur); 3858 } 3859 return (error); 3860 } 3861 3862 static void 3863 bridge_linkstate(struct ifnet *ifp) 3864 { 3865 struct bridge_softc *sc = ifp->if_bridge; 3866 struct bridge_iflist *bif; 3867 struct epoch_tracker et; 3868 3869 NET_EPOCH_ENTER(et); 3870 3871 bif = bridge_lookup_member_if(sc, ifp); 3872 if (bif == NULL) { 3873 NET_EPOCH_EXIT(et); 3874 return; 3875 } 3876 bridge_linkcheck(sc); 3877 3878 bstp_linkstate(&bif->bif_stp); 3879 3880 NET_EPOCH_EXIT(et); 3881 } 3882 3883 static void 3884 bridge_linkcheck(struct bridge_softc *sc) 3885 { 3886 struct bridge_iflist *bif; 3887 int new_link, hasls; 3888 3889 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3890 3891 new_link = LINK_STATE_DOWN; 3892 hasls = 0; 3893 /* Our link is considered up if at least one of our ports is active */ 3894 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3895 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3896 hasls++; 3897 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3898 new_link = LINK_STATE_UP; 3899 break; 3900 } 3901 } 3902 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3903 /* If no interfaces support link-state then we default to up */ 3904 new_link = LINK_STATE_UP; 3905 } 3906 if_link_state_change(sc->sc_ifp, new_link); 3907 } 3908