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 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/eventhandler.h> 85 #include <sys/mbuf.h> 86 #include <sys/malloc.h> 87 #include <sys/protosw.h> 88 #include <sys/systm.h> 89 #include <sys/jail.h> 90 #include <sys/time.h> 91 #include <sys/socket.h> /* for net/if.h */ 92 #include <sys/sockio.h> 93 #include <sys/ctype.h> /* string functions */ 94 #include <sys/kernel.h> 95 #include <sys/random.h> 96 #include <sys/syslog.h> 97 #include <sys/sysctl.h> 98 #include <vm/uma.h> 99 #include <sys/module.h> 100 #include <sys/priv.h> 101 #include <sys/proc.h> 102 #include <sys/lock.h> 103 #include <sys/mutex.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_clone.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_var.h> 111 #include <net/if_private.h> 112 #include <net/pfil.h> 113 #include <net/vnet.h> 114 115 #include <netinet/in.h> 116 #include <netinet/in_systm.h> 117 #include <netinet/in_var.h> 118 #include <netinet/ip.h> 119 #include <netinet/ip_var.h> 120 #ifdef INET6 121 #include <netinet/ip6.h> 122 #include <netinet6/ip6_var.h> 123 #include <netinet6/in6_ifattach.h> 124 #endif 125 #if defined(INET) || defined(INET6) 126 #include <netinet/ip_carp.h> 127 #endif 128 #include <machine/in_cksum.h> 129 #include <netinet/if_ether.h> 130 #include <net/bridgestp.h> 131 #include <net/if_bridgevar.h> 132 #include <net/if_llc.h> 133 #include <net/if_vlan_var.h> 134 135 #include <net/route.h> 136 137 /* 138 * At various points in the code we need to know if we're hooked into the INET 139 * and/or INET6 pfil. Define some macros to do that based on which IP versions 140 * are enabled in the kernel. This avoids littering the rest of the code with 141 * #ifnet INET6 to avoid referencing V_inet6_pfil_head. 142 */ 143 #ifdef INET6 144 #define PFIL_HOOKED_IN_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 145 #define PFIL_HOOKED_OUT_INET6 PFIL_HOOKED_OUT(V_inet6_pfil_head) 146 #else 147 #define PFIL_HOOKED_IN_INET6 false 148 #define PFIL_HOOKED_OUT_INET6 false 149 #endif 150 151 #ifdef INET 152 #define PFIL_HOOKED_IN_INET PFIL_HOOKED_IN(V_inet_pfil_head) 153 #define PFIL_HOOKED_OUT_INET PFIL_HOOKED_OUT(V_inet_pfil_head) 154 #else 155 #define PFIL_HOOKED_IN_INET false 156 #define PFIL_HOOKED_OUT_INET false 157 #endif 158 159 #define PFIL_HOOKED_IN_46 (PFIL_HOOKED_IN_INET6 || PFIL_HOOKED_IN_INET) 160 #define PFIL_HOOKED_OUT_46 (PFIL_HOOKED_OUT_INET6 || PFIL_HOOKED_OUT_INET) 161 162 /* 163 * Size of the route hash table. Must be a power of two. 164 */ 165 #ifndef BRIDGE_RTHASH_SIZE 166 #define BRIDGE_RTHASH_SIZE 1024 167 #endif 168 169 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 170 171 /* 172 * Default maximum number of addresses to cache. 173 */ 174 #ifndef BRIDGE_RTABLE_MAX 175 #define BRIDGE_RTABLE_MAX 2000 176 #endif 177 178 /* 179 * Timeout (in seconds) for entries learned dynamically. 180 */ 181 #ifndef BRIDGE_RTABLE_TIMEOUT 182 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 183 #endif 184 185 /* 186 * Number of seconds between walks of the route list. 187 */ 188 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 189 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 190 #endif 191 192 /* 193 * List of capabilities to possibly mask on the member interface. 194 */ 195 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 196 IFCAP_TXCSUM_IPV6) 197 198 /* 199 * List of capabilities to strip 200 */ 201 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 202 203 /* 204 * Bridge locking 205 * 206 * The bridge relies heavily on the epoch(9) system to protect its data 207 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 208 * must ensure there is only one writer at a time. 209 * 210 * That is: for read accesses we only need to be in NET_EPOCH, but for write 211 * accesses we must hold: 212 * 213 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 214 * - BRIDGE_LOCK, for any other change 215 * 216 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 217 * calls to bridge member interfaces and these ioctl()s can sleep. 218 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 219 * required while we're in NET_EPOCH and then we're not allowed to sleep. 220 */ 221 #define BRIDGE_LOCK_INIT(_sc) do { \ 222 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 223 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 224 } while (0) 225 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 226 sx_destroy(&(_sc)->sc_sx); \ 227 mtx_destroy(&(_sc)->sc_rt_mtx); \ 228 } while (0) 229 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 230 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 231 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 232 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 233 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 234 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 235 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 236 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 237 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 238 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 239 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 240 241 /* 242 * Bridge interface list entry. 243 */ 244 struct bridge_iflist { 245 CK_LIST_ENTRY(bridge_iflist) bif_next; 246 struct ifnet *bif_ifp; /* member if */ 247 struct bstp_port bif_stp; /* STP state */ 248 uint32_t bif_flags; /* member if flags */ 249 int bif_savedcaps; /* saved capabilities */ 250 uint32_t bif_addrmax; /* max # of addresses */ 251 uint32_t bif_addrcnt; /* cur. # of addresses */ 252 uint32_t bif_addrexceeded;/* # of address violations */ 253 struct epoch_context bif_epoch_ctx; 254 }; 255 256 /* 257 * Bridge route node. 258 */ 259 struct bridge_rtnode { 260 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 261 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 262 struct bridge_iflist *brt_dst; /* destination if */ 263 unsigned long brt_expire; /* expiration time */ 264 uint8_t brt_flags; /* address flags */ 265 uint8_t brt_addr[ETHER_ADDR_LEN]; 266 uint16_t brt_vlan; /* vlan id */ 267 struct vnet *brt_vnet; 268 struct epoch_context brt_epoch_ctx; 269 }; 270 #define brt_ifp brt_dst->bif_ifp 271 272 /* 273 * Software state for each bridge. 274 */ 275 struct bridge_softc { 276 struct ifnet *sc_ifp; /* make this an interface */ 277 LIST_ENTRY(bridge_softc) sc_list; 278 struct sx sc_sx; 279 struct mtx sc_rt_mtx; 280 uint32_t sc_brtmax; /* max # of addresses */ 281 uint32_t sc_brtcnt; /* cur. # of addresses */ 282 uint32_t sc_brttimeout; /* rt timeout in seconds */ 283 struct callout sc_brcallout; /* bridge callout */ 284 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 285 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 286 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 287 uint32_t sc_rthash_key; /* key for hash */ 288 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 289 struct bstp_state sc_stp; /* STP state */ 290 uint32_t sc_brtexceeded; /* # of cache drops */ 291 struct ifnet *sc_ifaddr; /* member mac copied from */ 292 struct ether_addr sc_defaddr; /* Default MAC address */ 293 if_input_fn_t sc_if_input; /* Saved copy of if_input */ 294 struct epoch_context sc_epoch_ctx; 295 }; 296 297 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 298 #define V_bridge_list_sx VNET(bridge_list_sx) 299 static eventhandler_tag bridge_detach_cookie; 300 301 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 302 303 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 304 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 305 306 static int bridge_clone_create(struct if_clone *, char *, size_t, 307 struct ifc_data *, struct ifnet **); 308 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 309 310 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 311 static void bridge_mutecaps(struct bridge_softc *); 312 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 313 int); 314 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 315 static void bridge_init(void *); 316 static void bridge_dummynet(struct mbuf *, struct ifnet *); 317 static void bridge_stop(struct ifnet *, int); 318 static int bridge_transmit(struct ifnet *, struct mbuf *); 319 #ifdef ALTQ 320 static void bridge_altq_start(if_t); 321 static int bridge_altq_transmit(if_t, struct mbuf *); 322 #endif 323 static void bridge_qflush(struct ifnet *); 324 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 325 static void bridge_inject(struct ifnet *, struct mbuf *); 326 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 327 struct rtentry *); 328 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 329 struct mbuf *); 330 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 331 332 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 333 struct mbuf *m); 334 335 static void bridge_timer(void *); 336 337 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 338 struct mbuf *, int); 339 static void bridge_span(struct bridge_softc *, struct mbuf *); 340 341 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 342 uint16_t, struct bridge_iflist *, int, uint8_t); 343 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 344 uint16_t); 345 static void bridge_rttrim(struct bridge_softc *); 346 static void bridge_rtage(struct bridge_softc *); 347 static void bridge_rtflush(struct bridge_softc *, int); 348 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 349 uint16_t); 350 351 static void bridge_rtable_init(struct bridge_softc *); 352 static void bridge_rtable_fini(struct bridge_softc *); 353 354 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 355 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 356 const uint8_t *, uint16_t); 357 static int bridge_rtnode_insert(struct bridge_softc *, 358 struct bridge_rtnode *); 359 static void bridge_rtnode_destroy(struct bridge_softc *, 360 struct bridge_rtnode *); 361 static void bridge_rtable_expire(struct ifnet *, int); 362 static void bridge_state_change(struct ifnet *, int); 363 364 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 365 const char *name); 366 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 367 struct ifnet *ifp); 368 static void bridge_delete_member(struct bridge_softc *, 369 struct bridge_iflist *, int); 370 static void bridge_delete_span(struct bridge_softc *, 371 struct bridge_iflist *); 372 373 static int bridge_ioctl_add(struct bridge_softc *, void *); 374 static int bridge_ioctl_del(struct bridge_softc *, void *); 375 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 376 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 377 static int bridge_ioctl_scache(struct bridge_softc *, void *); 378 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 379 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 380 static int bridge_ioctl_rts(struct bridge_softc *, void *); 381 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 382 static int bridge_ioctl_sto(struct bridge_softc *, void *); 383 static int bridge_ioctl_gto(struct bridge_softc *, void *); 384 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 385 static int bridge_ioctl_flush(struct bridge_softc *, void *); 386 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 387 static int bridge_ioctl_spri(struct bridge_softc *, void *); 388 static int bridge_ioctl_ght(struct bridge_softc *, void *); 389 static int bridge_ioctl_sht(struct bridge_softc *, void *); 390 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 391 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 392 static int bridge_ioctl_gma(struct bridge_softc *, void *); 393 static int bridge_ioctl_sma(struct bridge_softc *, void *); 394 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 395 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 396 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 397 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 398 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 399 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 400 static int bridge_ioctl_grte(struct bridge_softc *, void *); 401 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 402 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 403 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 404 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 405 int); 406 #ifdef INET 407 static int bridge_ip_checkbasic(struct mbuf **mp); 408 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 409 struct ether_header *, int, struct llc *); 410 #endif /* INET */ 411 #ifdef INET6 412 static int bridge_ip6_checkbasic(struct mbuf **mp); 413 #endif /* INET6 */ 414 static void bridge_linkstate(struct ifnet *ifp); 415 static void bridge_linkcheck(struct bridge_softc *sc); 416 417 /* 418 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2 419 * to indicate untagged frames. 420 */ 421 #define VLANTAGOF(_m) \ 422 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL 423 424 static struct bstp_cb_ops bridge_ops = { 425 .bcb_state = bridge_state_change, 426 .bcb_rtage = bridge_rtable_expire 427 }; 428 429 SYSCTL_DECL(_net_link); 430 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 431 "Bridge"); 432 433 /* only pass IP[46] packets when pfil is enabled */ 434 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 435 #define V_pfil_onlyip VNET(pfil_onlyip) 436 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 437 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 438 "Only pass IP packets when pfil is enabled"); 439 440 /* run pfil hooks on the bridge interface */ 441 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 442 #define V_pfil_bridge VNET(pfil_bridge) 443 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 444 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 445 "Packet filter on the bridge interface"); 446 447 /* layer2 filter with ipfw */ 448 VNET_DEFINE_STATIC(int, pfil_ipfw); 449 #define V_pfil_ipfw VNET(pfil_ipfw) 450 451 /* layer2 ARP filter with ipfw */ 452 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 453 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 454 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 455 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 456 "Filter ARP packets through IPFW layer2"); 457 458 /* run pfil hooks on the member interface */ 459 VNET_DEFINE_STATIC(int, pfil_member) = 0; 460 #define V_pfil_member VNET(pfil_member) 461 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 462 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 463 "Packet filter on the member interface"); 464 465 /* run pfil hooks on the physical interface for locally destined packets */ 466 VNET_DEFINE_STATIC(int, pfil_local_phys); 467 #define V_pfil_local_phys VNET(pfil_local_phys) 468 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 469 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 470 "Packet filter on the physical interface for locally destined packets"); 471 472 /* log STP state changes */ 473 VNET_DEFINE_STATIC(int, log_stp); 474 #define V_log_stp VNET(log_stp) 475 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 476 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 477 "Log STP state changes"); 478 479 /* share MAC with first bridge member */ 480 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 481 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 482 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 483 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 484 "Inherit MAC address from the first bridge member"); 485 486 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 487 #define V_allow_llz_overlap VNET(allow_llz_overlap) 488 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 489 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 490 "Allow overlap of link-local scope " 491 "zones of a bridge interface and the member interfaces"); 492 493 /* log MAC address port flapping */ 494 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 495 #define V_log_mac_flap VNET(log_mac_flap) 496 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 497 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 498 "Log MAC address port flapping"); 499 500 VNET_DEFINE_STATIC(int, log_interval) = 5; 501 VNET_DEFINE_STATIC(int, log_count) = 0; 502 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 503 504 #define V_log_interval VNET(log_interval) 505 #define V_log_count VNET(log_count) 506 #define V_log_last VNET(log_last) 507 508 struct bridge_control { 509 int (*bc_func)(struct bridge_softc *, void *); 510 int bc_argsize; 511 int bc_flags; 512 }; 513 514 #define BC_F_COPYIN 0x01 /* copy arguments in */ 515 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 516 #define BC_F_SUSER 0x04 /* do super-user check */ 517 518 static const struct bridge_control bridge_control_table[] = { 519 { bridge_ioctl_add, sizeof(struct ifbreq), 520 BC_F_COPYIN|BC_F_SUSER }, 521 { bridge_ioctl_del, sizeof(struct ifbreq), 522 BC_F_COPYIN|BC_F_SUSER }, 523 524 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 525 BC_F_COPYIN|BC_F_COPYOUT }, 526 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 527 BC_F_COPYIN|BC_F_SUSER }, 528 529 { bridge_ioctl_scache, sizeof(struct ifbrparam), 530 BC_F_COPYIN|BC_F_SUSER }, 531 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 532 BC_F_COPYOUT }, 533 534 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 535 BC_F_COPYIN|BC_F_COPYOUT }, 536 { bridge_ioctl_rts, sizeof(struct ifbaconf), 537 BC_F_COPYIN|BC_F_COPYOUT }, 538 539 { bridge_ioctl_saddr, sizeof(struct ifbareq), 540 BC_F_COPYIN|BC_F_SUSER }, 541 542 { bridge_ioctl_sto, sizeof(struct ifbrparam), 543 BC_F_COPYIN|BC_F_SUSER }, 544 { bridge_ioctl_gto, sizeof(struct ifbrparam), 545 BC_F_COPYOUT }, 546 547 { bridge_ioctl_daddr, sizeof(struct ifbareq), 548 BC_F_COPYIN|BC_F_SUSER }, 549 550 { bridge_ioctl_flush, sizeof(struct ifbreq), 551 BC_F_COPYIN|BC_F_SUSER }, 552 553 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 554 BC_F_COPYOUT }, 555 { bridge_ioctl_spri, sizeof(struct ifbrparam), 556 BC_F_COPYIN|BC_F_SUSER }, 557 558 { bridge_ioctl_ght, sizeof(struct ifbrparam), 559 BC_F_COPYOUT }, 560 { bridge_ioctl_sht, sizeof(struct ifbrparam), 561 BC_F_COPYIN|BC_F_SUSER }, 562 563 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 564 BC_F_COPYOUT }, 565 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 566 BC_F_COPYIN|BC_F_SUSER }, 567 568 { bridge_ioctl_gma, sizeof(struct ifbrparam), 569 BC_F_COPYOUT }, 570 { bridge_ioctl_sma, sizeof(struct ifbrparam), 571 BC_F_COPYIN|BC_F_SUSER }, 572 573 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 574 BC_F_COPYIN|BC_F_SUSER }, 575 576 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 577 BC_F_COPYIN|BC_F_SUSER }, 578 579 { bridge_ioctl_addspan, sizeof(struct ifbreq), 580 BC_F_COPYIN|BC_F_SUSER }, 581 { bridge_ioctl_delspan, sizeof(struct ifbreq), 582 BC_F_COPYIN|BC_F_SUSER }, 583 584 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 585 BC_F_COPYOUT }, 586 587 { bridge_ioctl_grte, sizeof(struct ifbrparam), 588 BC_F_COPYOUT }, 589 590 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 591 BC_F_COPYIN|BC_F_COPYOUT }, 592 593 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 594 BC_F_COPYIN|BC_F_SUSER }, 595 596 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 597 BC_F_COPYIN|BC_F_SUSER }, 598 599 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 600 BC_F_COPYIN|BC_F_SUSER }, 601 602 }; 603 static const int bridge_control_table_size = nitems(bridge_control_table); 604 605 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 606 #define V_bridge_list VNET(bridge_list) 607 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 608 "if_bridge list") 609 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 610 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 611 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 612 613 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 614 #define V_bridge_cloner VNET(bridge_cloner) 615 616 static const char bridge_name[] = "bridge"; 617 618 static void 619 vnet_bridge_init(const void *unused __unused) 620 { 621 622 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 623 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 624 UMA_ALIGN_PTR, 0); 625 BRIDGE_LIST_LOCK_INIT(); 626 LIST_INIT(&V_bridge_list); 627 628 struct if_clone_addreq req = { 629 .create_f = bridge_clone_create, 630 .destroy_f = bridge_clone_destroy, 631 .flags = IFC_F_AUTOUNIT, 632 }; 633 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 634 } 635 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 636 vnet_bridge_init, NULL); 637 638 static void 639 vnet_bridge_uninit(const void *unused __unused) 640 { 641 642 ifc_detach_cloner(V_bridge_cloner); 643 V_bridge_cloner = NULL; 644 BRIDGE_LIST_LOCK_DESTROY(); 645 646 /* Callbacks may use the UMA zone. */ 647 NET_EPOCH_DRAIN_CALLBACKS(); 648 649 uma_zdestroy(V_bridge_rtnode_zone); 650 } 651 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 652 vnet_bridge_uninit, NULL); 653 654 static int 655 bridge_modevent(module_t mod, int type, void *data) 656 { 657 658 switch (type) { 659 case MOD_LOAD: 660 bridge_dn_p = bridge_dummynet; 661 bridge_detach_cookie = EVENTHANDLER_REGISTER( 662 ifnet_departure_event, bridge_ifdetach, NULL, 663 EVENTHANDLER_PRI_ANY); 664 break; 665 case MOD_UNLOAD: 666 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 667 bridge_detach_cookie); 668 bridge_dn_p = NULL; 669 break; 670 default: 671 return (EOPNOTSUPP); 672 } 673 return (0); 674 } 675 676 static moduledata_t bridge_mod = { 677 "if_bridge", 678 bridge_modevent, 679 0 680 }; 681 682 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 683 MODULE_VERSION(if_bridge, 1); 684 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 685 686 /* 687 * handler for net.link.bridge.ipfw 688 */ 689 static int 690 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 691 { 692 int enable = V_pfil_ipfw; 693 int error; 694 695 error = sysctl_handle_int(oidp, &enable, 0, req); 696 enable &= 1; 697 698 if (enable != V_pfil_ipfw) { 699 V_pfil_ipfw = enable; 700 701 /* 702 * Disable pfil so that ipfw doesnt run twice, if the user 703 * really wants both then they can re-enable pfil_bridge and/or 704 * pfil_member. Also allow non-ip packets as ipfw can filter by 705 * layer2 type. 706 */ 707 if (V_pfil_ipfw) { 708 V_pfil_onlyip = 0; 709 V_pfil_bridge = 0; 710 V_pfil_member = 0; 711 } 712 } 713 714 return (error); 715 } 716 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 717 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 718 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 719 "Layer2 filter with IPFW"); 720 721 #ifdef VIMAGE 722 static void 723 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 724 { 725 struct bridge_softc *sc = ifp->if_softc; 726 struct bridge_iflist *bif; 727 728 BRIDGE_LOCK(sc); 729 730 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 731 bridge_delete_member(sc, bif, 0); 732 733 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 734 bridge_delete_span(sc, bif); 735 } 736 737 BRIDGE_UNLOCK(sc); 738 739 ether_reassign(ifp, newvnet, arg); 740 } 741 #endif 742 743 /* 744 * bridge_clone_create: 745 * 746 * Create a new bridge instance. 747 */ 748 static int 749 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 750 struct ifc_data *ifd, struct ifnet **ifpp) 751 { 752 struct bridge_softc *sc; 753 struct ifnet *ifp; 754 755 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 756 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 757 if (ifp == NULL) { 758 free(sc, M_DEVBUF); 759 return (ENOSPC); 760 } 761 762 BRIDGE_LOCK_INIT(sc); 763 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 764 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 765 766 /* Initialize our routing table. */ 767 bridge_rtable_init(sc); 768 769 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 770 771 CK_LIST_INIT(&sc->sc_iflist); 772 CK_LIST_INIT(&sc->sc_spanlist); 773 774 ifp->if_softc = sc; 775 if_initname(ifp, bridge_name, ifd->unit); 776 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 777 ifp->if_ioctl = bridge_ioctl; 778 #ifdef ALTQ 779 ifp->if_start = bridge_altq_start; 780 ifp->if_transmit = bridge_altq_transmit; 781 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 782 ifp->if_snd.ifq_drv_maxlen = 0; 783 IFQ_SET_READY(&ifp->if_snd); 784 #else 785 ifp->if_transmit = bridge_transmit; 786 #endif 787 ifp->if_qflush = bridge_qflush; 788 ifp->if_init = bridge_init; 789 ifp->if_type = IFT_BRIDGE; 790 791 ether_gen_addr(ifp, &sc->sc_defaddr); 792 793 bstp_attach(&sc->sc_stp, &bridge_ops); 794 ether_ifattach(ifp, sc->sc_defaddr.octet); 795 /* Now undo some of the damage... */ 796 ifp->if_baudrate = 0; 797 ifp->if_type = IFT_BRIDGE; 798 #ifdef VIMAGE 799 ifp->if_reassign = bridge_reassign; 800 #endif 801 sc->sc_if_input = ifp->if_input; /* ether_input */ 802 ifp->if_input = bridge_inject; 803 804 /* 805 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge 806 * itself via bridge_inject(). This is required for netmap but 807 * otherwise has no effect. 808 */ 809 ifp->if_bridge_input = bridge_input; 810 811 BRIDGE_LIST_LOCK(); 812 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 813 BRIDGE_LIST_UNLOCK(); 814 *ifpp = ifp; 815 816 return (0); 817 } 818 819 static void 820 bridge_clone_destroy_cb(struct epoch_context *ctx) 821 { 822 struct bridge_softc *sc; 823 824 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 825 826 BRIDGE_LOCK_DESTROY(sc); 827 free(sc, M_DEVBUF); 828 } 829 830 /* 831 * bridge_clone_destroy: 832 * 833 * Destroy a bridge instance. 834 */ 835 static int 836 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 837 { 838 struct bridge_softc *sc = ifp->if_softc; 839 struct bridge_iflist *bif; 840 struct epoch_tracker et; 841 842 BRIDGE_LOCK(sc); 843 844 bridge_stop(ifp, 1); 845 ifp->if_flags &= ~IFF_UP; 846 847 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 848 bridge_delete_member(sc, bif, 0); 849 850 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 851 bridge_delete_span(sc, bif); 852 } 853 854 /* Tear down the routing table. */ 855 bridge_rtable_fini(sc); 856 857 BRIDGE_UNLOCK(sc); 858 859 NET_EPOCH_ENTER(et); 860 861 callout_drain(&sc->sc_brcallout); 862 863 BRIDGE_LIST_LOCK(); 864 LIST_REMOVE(sc, sc_list); 865 BRIDGE_LIST_UNLOCK(); 866 867 bstp_detach(&sc->sc_stp); 868 #ifdef ALTQ 869 IFQ_PURGE(&ifp->if_snd); 870 #endif 871 NET_EPOCH_EXIT(et); 872 873 ether_ifdetach(ifp); 874 if_free(ifp); 875 876 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 877 878 return (0); 879 } 880 881 /* 882 * bridge_ioctl: 883 * 884 * Handle a control request from the operator. 885 */ 886 static int 887 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 888 { 889 struct bridge_softc *sc = ifp->if_softc; 890 struct ifreq *ifr = (struct ifreq *)data; 891 struct bridge_iflist *bif; 892 struct thread *td = curthread; 893 union { 894 struct ifbreq ifbreq; 895 struct ifbifconf ifbifconf; 896 struct ifbareq ifbareq; 897 struct ifbaconf ifbaconf; 898 struct ifbrparam ifbrparam; 899 struct ifbropreq ifbropreq; 900 } args; 901 struct ifdrv *ifd = (struct ifdrv *) data; 902 const struct bridge_control *bc; 903 int error = 0, oldmtu; 904 905 BRIDGE_LOCK(sc); 906 907 switch (cmd) { 908 case SIOCADDMULTI: 909 case SIOCDELMULTI: 910 break; 911 912 case SIOCGDRVSPEC: 913 case SIOCSDRVSPEC: 914 if (ifd->ifd_cmd >= bridge_control_table_size) { 915 error = EINVAL; 916 break; 917 } 918 bc = &bridge_control_table[ifd->ifd_cmd]; 919 920 if (cmd == SIOCGDRVSPEC && 921 (bc->bc_flags & BC_F_COPYOUT) == 0) { 922 error = EINVAL; 923 break; 924 } 925 else if (cmd == SIOCSDRVSPEC && 926 (bc->bc_flags & BC_F_COPYOUT) != 0) { 927 error = EINVAL; 928 break; 929 } 930 931 if (bc->bc_flags & BC_F_SUSER) { 932 error = priv_check(td, PRIV_NET_BRIDGE); 933 if (error) 934 break; 935 } 936 937 if (ifd->ifd_len != bc->bc_argsize || 938 ifd->ifd_len > sizeof(args)) { 939 error = EINVAL; 940 break; 941 } 942 943 bzero(&args, sizeof(args)); 944 if (bc->bc_flags & BC_F_COPYIN) { 945 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 946 if (error) 947 break; 948 } 949 950 oldmtu = ifp->if_mtu; 951 error = (*bc->bc_func)(sc, &args); 952 if (error) 953 break; 954 955 /* 956 * Bridge MTU may change during addition of the first port. 957 * If it did, do network layer specific procedure. 958 */ 959 if (ifp->if_mtu != oldmtu) 960 if_notifymtu(ifp); 961 962 if (bc->bc_flags & BC_F_COPYOUT) 963 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 964 965 break; 966 967 case SIOCSIFFLAGS: 968 if (!(ifp->if_flags & IFF_UP) && 969 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 970 /* 971 * If interface is marked down and it is running, 972 * then stop and disable it. 973 */ 974 bridge_stop(ifp, 1); 975 } else if ((ifp->if_flags & IFF_UP) && 976 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 977 /* 978 * If interface is marked up and it is stopped, then 979 * start it. 980 */ 981 BRIDGE_UNLOCK(sc); 982 (*ifp->if_init)(sc); 983 BRIDGE_LOCK(sc); 984 } 985 break; 986 987 case SIOCSIFMTU: 988 oldmtu = sc->sc_ifp->if_mtu; 989 990 if (ifr->ifr_mtu < IF_MINMTU) { 991 error = EINVAL; 992 break; 993 } 994 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 995 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 996 break; 997 } 998 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 999 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 1000 SIOCSIFMTU, (caddr_t)ifr); 1001 if (error != 0) { 1002 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1003 " member %s\n", sc->sc_ifp->if_xname, 1004 ifr->ifr_mtu, 1005 bif->bif_ifp->if_xname); 1006 error = EINVAL; 1007 break; 1008 } 1009 } 1010 if (error) { 1011 /* Restore the previous MTU on all member interfaces. */ 1012 ifr->ifr_mtu = oldmtu; 1013 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1014 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 1015 SIOCSIFMTU, (caddr_t)ifr); 1016 } 1017 } else { 1018 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 1019 } 1020 break; 1021 default: 1022 /* 1023 * drop the lock as ether_ioctl() will call bridge_start() and 1024 * cause the lock to be recursed. 1025 */ 1026 BRIDGE_UNLOCK(sc); 1027 error = ether_ioctl(ifp, cmd, data); 1028 BRIDGE_LOCK(sc); 1029 break; 1030 } 1031 1032 BRIDGE_UNLOCK(sc); 1033 1034 return (error); 1035 } 1036 1037 /* 1038 * bridge_mutecaps: 1039 * 1040 * Clear or restore unwanted capabilities on the member interface 1041 */ 1042 static void 1043 bridge_mutecaps(struct bridge_softc *sc) 1044 { 1045 struct bridge_iflist *bif; 1046 int enabled, mask; 1047 1048 BRIDGE_LOCK_ASSERT(sc); 1049 1050 /* Initial bitmask of capabilities to test */ 1051 mask = BRIDGE_IFCAPS_MASK; 1052 1053 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1054 /* Every member must support it or its disabled */ 1055 mask &= bif->bif_savedcaps; 1056 } 1057 1058 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1059 enabled = bif->bif_ifp->if_capenable; 1060 enabled &= ~BRIDGE_IFCAPS_STRIP; 1061 /* strip off mask bits and enable them again if allowed */ 1062 enabled &= ~BRIDGE_IFCAPS_MASK; 1063 enabled |= mask; 1064 bridge_set_ifcap(sc, bif, enabled); 1065 } 1066 } 1067 1068 static void 1069 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1070 { 1071 struct ifnet *ifp = bif->bif_ifp; 1072 struct ifreq ifr; 1073 int error, mask, stuck; 1074 1075 bzero(&ifr, sizeof(ifr)); 1076 ifr.ifr_reqcap = set; 1077 1078 if (ifp->if_capenable != set) { 1079 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1080 if (error) 1081 if_printf(sc->sc_ifp, 1082 "error setting capabilities on %s: %d\n", 1083 ifp->if_xname, error); 1084 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1085 stuck = ifp->if_capenable & mask & ~set; 1086 if (stuck != 0) 1087 if_printf(sc->sc_ifp, 1088 "can't disable some capabilities on %s: 0x%x\n", 1089 ifp->if_xname, stuck); 1090 } 1091 } 1092 1093 /* 1094 * bridge_lookup_member: 1095 * 1096 * Lookup a bridge member interface. 1097 */ 1098 static struct bridge_iflist * 1099 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1100 { 1101 struct bridge_iflist *bif; 1102 struct ifnet *ifp; 1103 1104 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1105 1106 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1107 ifp = bif->bif_ifp; 1108 if (strcmp(ifp->if_xname, name) == 0) 1109 return (bif); 1110 } 1111 1112 return (NULL); 1113 } 1114 1115 /* 1116 * bridge_lookup_member_if: 1117 * 1118 * Lookup a bridge member interface by ifnet*. 1119 */ 1120 static struct bridge_iflist * 1121 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1122 { 1123 struct bridge_iflist *bif; 1124 1125 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1126 1127 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1128 if (bif->bif_ifp == member_ifp) 1129 return (bif); 1130 } 1131 1132 return (NULL); 1133 } 1134 1135 static void 1136 bridge_delete_member_cb(struct epoch_context *ctx) 1137 { 1138 struct bridge_iflist *bif; 1139 1140 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1141 1142 free(bif, M_DEVBUF); 1143 } 1144 1145 /* 1146 * bridge_delete_member: 1147 * 1148 * Delete the specified member interface. 1149 */ 1150 static void 1151 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1152 int gone) 1153 { 1154 struct ifnet *ifs = bif->bif_ifp; 1155 struct ifnet *fif = NULL; 1156 struct bridge_iflist *bifl; 1157 1158 BRIDGE_LOCK_ASSERT(sc); 1159 1160 if (bif->bif_flags & IFBIF_STP) 1161 bstp_disable(&bif->bif_stp); 1162 1163 ifs->if_bridge = NULL; 1164 CK_LIST_REMOVE(bif, bif_next); 1165 1166 /* 1167 * If removing the interface that gave the bridge its mac address, set 1168 * the mac address of the bridge to the address of the next member, or 1169 * to its default address if no members are left. 1170 */ 1171 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1172 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1173 bcopy(&sc->sc_defaddr, 1174 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1175 sc->sc_ifaddr = NULL; 1176 } else { 1177 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1178 fif = bifl->bif_ifp; 1179 bcopy(IF_LLADDR(fif), 1180 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1181 sc->sc_ifaddr = fif; 1182 } 1183 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1184 } 1185 1186 bridge_linkcheck(sc); 1187 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1188 BRIDGE_RT_LOCK(sc); 1189 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1190 BRIDGE_RT_UNLOCK(sc); 1191 KASSERT(bif->bif_addrcnt == 0, 1192 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1193 1194 ifs->if_bridge_output = NULL; 1195 ifs->if_bridge_input = NULL; 1196 ifs->if_bridge_linkstate = NULL; 1197 if (!gone) { 1198 switch (ifs->if_type) { 1199 case IFT_ETHER: 1200 case IFT_L2VLAN: 1201 /* 1202 * Take the interface out of promiscuous mode, but only 1203 * if it was promiscuous in the first place. It might 1204 * not be if we're in the bridge_ioctl_add() error path. 1205 */ 1206 if (ifs->if_flags & IFF_PROMISC) 1207 (void) ifpromisc(ifs, 0); 1208 break; 1209 1210 case IFT_GIF: 1211 break; 1212 1213 default: 1214 #ifdef DIAGNOSTIC 1215 panic("bridge_delete_member: impossible"); 1216 #endif 1217 break; 1218 } 1219 /* reneable any interface capabilities */ 1220 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1221 } 1222 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1223 1224 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1225 } 1226 1227 /* 1228 * bridge_delete_span: 1229 * 1230 * Delete the specified span interface. 1231 */ 1232 static void 1233 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1234 { 1235 BRIDGE_LOCK_ASSERT(sc); 1236 1237 KASSERT(bif->bif_ifp->if_bridge == NULL, 1238 ("%s: not a span interface", __func__)); 1239 1240 CK_LIST_REMOVE(bif, bif_next); 1241 1242 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1243 } 1244 1245 static int 1246 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1247 { 1248 struct ifbreq *req = arg; 1249 struct bridge_iflist *bif = NULL; 1250 struct ifnet *ifs; 1251 int error = 0; 1252 1253 ifs = ifunit(req->ifbr_ifsname); 1254 if (ifs == NULL) 1255 return (ENOENT); 1256 if (ifs->if_ioctl == NULL) /* must be supported */ 1257 return (EINVAL); 1258 1259 /* If it's in the span list, it can't be a member. */ 1260 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1261 if (ifs == bif->bif_ifp) 1262 return (EBUSY); 1263 1264 if (ifs->if_bridge == sc) 1265 return (EEXIST); 1266 1267 if (ifs->if_bridge != NULL) 1268 return (EBUSY); 1269 1270 switch (ifs->if_type) { 1271 case IFT_ETHER: 1272 case IFT_L2VLAN: 1273 case IFT_GIF: 1274 /* permitted interface types */ 1275 break; 1276 default: 1277 return (EINVAL); 1278 } 1279 1280 #ifdef INET6 1281 /* 1282 * Two valid inet6 addresses with link-local scope must not be 1283 * on the parent interface and the member interfaces at the 1284 * same time. This restriction is needed to prevent violation 1285 * of link-local scope zone. Attempts to add a member 1286 * interface which has inet6 addresses when the parent has 1287 * inet6 triggers removal of all inet6 addresses on the member 1288 * interface. 1289 */ 1290 1291 /* Check if the parent interface has a link-local scope addr. */ 1292 if (V_allow_llz_overlap == 0 && 1293 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1294 /* 1295 * If any, remove all inet6 addresses from the member 1296 * interfaces. 1297 */ 1298 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1299 if (in6ifa_llaonifp(bif->bif_ifp)) { 1300 in6_ifdetach(bif->bif_ifp); 1301 if_printf(sc->sc_ifp, 1302 "IPv6 addresses on %s have been removed " 1303 "before adding it as a member to prevent " 1304 "IPv6 address scope violation.\n", 1305 bif->bif_ifp->if_xname); 1306 } 1307 } 1308 if (in6ifa_llaonifp(ifs)) { 1309 in6_ifdetach(ifs); 1310 if_printf(sc->sc_ifp, 1311 "IPv6 addresses on %s have been removed " 1312 "before adding it as a member to prevent " 1313 "IPv6 address scope violation.\n", 1314 ifs->if_xname); 1315 } 1316 } 1317 #endif 1318 /* Allow the first Ethernet member to define the MTU */ 1319 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1320 sc->sc_ifp->if_mtu = ifs->if_mtu; 1321 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1322 struct ifreq ifr; 1323 1324 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1325 ifs->if_xname); 1326 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1327 1328 error = (*ifs->if_ioctl)(ifs, 1329 SIOCSIFMTU, (caddr_t)&ifr); 1330 if (error != 0) { 1331 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1332 " new member %s\n", sc->sc_ifp->if_xname, 1333 ifr.ifr_mtu, 1334 ifs->if_xname); 1335 return (EINVAL); 1336 } 1337 } 1338 1339 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1340 if (bif == NULL) 1341 return (ENOMEM); 1342 1343 bif->bif_ifp = ifs; 1344 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1345 bif->bif_savedcaps = ifs->if_capenable; 1346 1347 /* 1348 * Assign the interface's MAC address to the bridge if it's the first 1349 * member and the MAC address of the bridge has not been changed from 1350 * the default randomly generated one. 1351 */ 1352 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1353 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1354 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1355 sc->sc_ifaddr = ifs; 1356 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1357 } 1358 1359 ifs->if_bridge = sc; 1360 ifs->if_bridge_output = bridge_output; 1361 ifs->if_bridge_input = bridge_input; 1362 ifs->if_bridge_linkstate = bridge_linkstate; 1363 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1364 /* 1365 * XXX: XLOCK HERE!?! 1366 * 1367 * NOTE: insert_***HEAD*** should be safe for the traversals. 1368 */ 1369 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1370 1371 /* Set interface capabilities to the intersection set of all members */ 1372 bridge_mutecaps(sc); 1373 bridge_linkcheck(sc); 1374 1375 /* Place the interface into promiscuous mode */ 1376 switch (ifs->if_type) { 1377 case IFT_ETHER: 1378 case IFT_L2VLAN: 1379 error = ifpromisc(ifs, 1); 1380 break; 1381 } 1382 1383 if (error) 1384 bridge_delete_member(sc, bif, 0); 1385 return (error); 1386 } 1387 1388 static int 1389 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1390 { 1391 struct ifbreq *req = arg; 1392 struct bridge_iflist *bif; 1393 1394 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1395 if (bif == NULL) 1396 return (ENOENT); 1397 1398 bridge_delete_member(sc, bif, 0); 1399 1400 return (0); 1401 } 1402 1403 static int 1404 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1405 { 1406 struct ifbreq *req = arg; 1407 struct bridge_iflist *bif; 1408 struct bstp_port *bp; 1409 1410 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1411 if (bif == NULL) 1412 return (ENOENT); 1413 1414 bp = &bif->bif_stp; 1415 req->ifbr_ifsflags = bif->bif_flags; 1416 req->ifbr_state = bp->bp_state; 1417 req->ifbr_priority = bp->bp_priority; 1418 req->ifbr_path_cost = bp->bp_path_cost; 1419 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1420 req->ifbr_proto = bp->bp_protover; 1421 req->ifbr_role = bp->bp_role; 1422 req->ifbr_stpflags = bp->bp_flags; 1423 req->ifbr_addrcnt = bif->bif_addrcnt; 1424 req->ifbr_addrmax = bif->bif_addrmax; 1425 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1426 1427 /* Copy STP state options as flags */ 1428 if (bp->bp_operedge) 1429 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1430 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1431 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1432 if (bp->bp_ptp_link) 1433 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1434 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1435 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1436 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1437 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1438 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1439 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1440 return (0); 1441 } 1442 1443 static int 1444 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1445 { 1446 struct epoch_tracker et; 1447 struct ifbreq *req = arg; 1448 struct bridge_iflist *bif; 1449 struct bstp_port *bp; 1450 int error; 1451 1452 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1453 if (bif == NULL) 1454 return (ENOENT); 1455 bp = &bif->bif_stp; 1456 1457 if (req->ifbr_ifsflags & IFBIF_SPAN) 1458 /* SPAN is readonly */ 1459 return (EINVAL); 1460 1461 NET_EPOCH_ENTER(et); 1462 1463 if (req->ifbr_ifsflags & IFBIF_STP) { 1464 if ((bif->bif_flags & IFBIF_STP) == 0) { 1465 error = bstp_enable(&bif->bif_stp); 1466 if (error) { 1467 NET_EPOCH_EXIT(et); 1468 return (error); 1469 } 1470 } 1471 } else { 1472 if ((bif->bif_flags & IFBIF_STP) != 0) 1473 bstp_disable(&bif->bif_stp); 1474 } 1475 1476 /* Pass on STP flags */ 1477 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1478 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1479 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1480 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1481 1482 /* Save the bits relating to the bridge */ 1483 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1484 1485 NET_EPOCH_EXIT(et); 1486 1487 return (0); 1488 } 1489 1490 static int 1491 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1492 { 1493 struct ifbrparam *param = arg; 1494 1495 sc->sc_brtmax = param->ifbrp_csize; 1496 bridge_rttrim(sc); 1497 1498 return (0); 1499 } 1500 1501 static int 1502 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1503 { 1504 struct ifbrparam *param = arg; 1505 1506 param->ifbrp_csize = sc->sc_brtmax; 1507 1508 return (0); 1509 } 1510 1511 static int 1512 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1513 { 1514 struct ifbifconf *bifc = arg; 1515 struct bridge_iflist *bif; 1516 struct ifbreq breq; 1517 char *buf, *outbuf; 1518 int count, buflen, len, error = 0; 1519 1520 count = 0; 1521 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1522 count++; 1523 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1524 count++; 1525 1526 buflen = sizeof(breq) * count; 1527 if (bifc->ifbic_len == 0) { 1528 bifc->ifbic_len = buflen; 1529 return (0); 1530 } 1531 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1532 if (outbuf == NULL) 1533 return (ENOMEM); 1534 1535 count = 0; 1536 buf = outbuf; 1537 len = min(bifc->ifbic_len, buflen); 1538 bzero(&breq, sizeof(breq)); 1539 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1540 if (len < sizeof(breq)) 1541 break; 1542 1543 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1544 sizeof(breq.ifbr_ifsname)); 1545 /* Fill in the ifbreq structure */ 1546 error = bridge_ioctl_gifflags(sc, &breq); 1547 if (error) 1548 break; 1549 memcpy(buf, &breq, sizeof(breq)); 1550 count++; 1551 buf += sizeof(breq); 1552 len -= sizeof(breq); 1553 } 1554 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1555 if (len < sizeof(breq)) 1556 break; 1557 1558 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1559 sizeof(breq.ifbr_ifsname)); 1560 breq.ifbr_ifsflags = bif->bif_flags; 1561 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1562 memcpy(buf, &breq, sizeof(breq)); 1563 count++; 1564 buf += sizeof(breq); 1565 len -= sizeof(breq); 1566 } 1567 1568 bifc->ifbic_len = sizeof(breq) * count; 1569 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1570 free(outbuf, M_TEMP); 1571 return (error); 1572 } 1573 1574 static int 1575 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1576 { 1577 struct ifbaconf *bac = arg; 1578 struct bridge_rtnode *brt; 1579 struct ifbareq bareq; 1580 char *buf, *outbuf; 1581 int count, buflen, len, error = 0; 1582 1583 if (bac->ifbac_len == 0) 1584 return (0); 1585 1586 count = 0; 1587 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1588 count++; 1589 buflen = sizeof(bareq) * count; 1590 1591 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1592 if (outbuf == NULL) 1593 return (ENOMEM); 1594 1595 count = 0; 1596 buf = outbuf; 1597 len = min(bac->ifbac_len, buflen); 1598 bzero(&bareq, sizeof(bareq)); 1599 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1600 if (len < sizeof(bareq)) 1601 goto out; 1602 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1603 sizeof(bareq.ifba_ifsname)); 1604 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1605 bareq.ifba_vlan = brt->brt_vlan; 1606 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1607 time_uptime < brt->brt_expire) 1608 bareq.ifba_expire = brt->brt_expire - time_uptime; 1609 else 1610 bareq.ifba_expire = 0; 1611 bareq.ifba_flags = brt->brt_flags; 1612 1613 memcpy(buf, &bareq, sizeof(bareq)); 1614 count++; 1615 buf += sizeof(bareq); 1616 len -= sizeof(bareq); 1617 } 1618 out: 1619 bac->ifbac_len = sizeof(bareq) * count; 1620 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1621 free(outbuf, M_TEMP); 1622 return (error); 1623 } 1624 1625 static int 1626 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1627 { 1628 struct ifbareq *req = arg; 1629 struct bridge_iflist *bif; 1630 struct epoch_tracker et; 1631 int error; 1632 1633 NET_EPOCH_ENTER(et); 1634 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1635 if (bif == NULL) { 1636 NET_EPOCH_EXIT(et); 1637 return (ENOENT); 1638 } 1639 1640 /* bridge_rtupdate() may acquire the lock. */ 1641 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1642 req->ifba_flags); 1643 NET_EPOCH_EXIT(et); 1644 1645 return (error); 1646 } 1647 1648 static int 1649 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1650 { 1651 struct ifbrparam *param = arg; 1652 1653 sc->sc_brttimeout = param->ifbrp_ctime; 1654 return (0); 1655 } 1656 1657 static int 1658 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1659 { 1660 struct ifbrparam *param = arg; 1661 1662 param->ifbrp_ctime = sc->sc_brttimeout; 1663 return (0); 1664 } 1665 1666 static int 1667 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1668 { 1669 struct ifbareq *req = arg; 1670 int vlan = req->ifba_vlan; 1671 1672 /* Userspace uses '0' to mean 'any vlan' */ 1673 if (vlan == 0) 1674 vlan = DOT1Q_VID_RSVD_IMPL; 1675 1676 return (bridge_rtdaddr(sc, req->ifba_dst, vlan)); 1677 } 1678 1679 static int 1680 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1681 { 1682 struct ifbreq *req = arg; 1683 1684 BRIDGE_RT_LOCK(sc); 1685 bridge_rtflush(sc, req->ifbr_ifsflags); 1686 BRIDGE_RT_UNLOCK(sc); 1687 1688 return (0); 1689 } 1690 1691 static int 1692 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1693 { 1694 struct ifbrparam *param = arg; 1695 struct bstp_state *bs = &sc->sc_stp; 1696 1697 param->ifbrp_prio = bs->bs_bridge_priority; 1698 return (0); 1699 } 1700 1701 static int 1702 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1703 { 1704 struct ifbrparam *param = arg; 1705 1706 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1707 } 1708 1709 static int 1710 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1711 { 1712 struct ifbrparam *param = arg; 1713 struct bstp_state *bs = &sc->sc_stp; 1714 1715 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1716 return (0); 1717 } 1718 1719 static int 1720 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1721 { 1722 struct ifbrparam *param = arg; 1723 1724 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1725 } 1726 1727 static int 1728 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1729 { 1730 struct ifbrparam *param = arg; 1731 struct bstp_state *bs = &sc->sc_stp; 1732 1733 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1734 return (0); 1735 } 1736 1737 static int 1738 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1739 { 1740 struct ifbrparam *param = arg; 1741 1742 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1743 } 1744 1745 static int 1746 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1747 { 1748 struct ifbrparam *param = arg; 1749 struct bstp_state *bs = &sc->sc_stp; 1750 1751 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1752 return (0); 1753 } 1754 1755 static int 1756 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1757 { 1758 struct ifbrparam *param = arg; 1759 1760 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1761 } 1762 1763 static int 1764 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1765 { 1766 struct ifbreq *req = arg; 1767 struct bridge_iflist *bif; 1768 1769 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1770 if (bif == NULL) 1771 return (ENOENT); 1772 1773 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1774 } 1775 1776 static int 1777 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1778 { 1779 struct ifbreq *req = arg; 1780 struct bridge_iflist *bif; 1781 1782 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1783 if (bif == NULL) 1784 return (ENOENT); 1785 1786 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1787 } 1788 1789 static int 1790 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1791 { 1792 struct ifbreq *req = arg; 1793 struct bridge_iflist *bif; 1794 1795 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1796 if (bif == NULL) 1797 return (ENOENT); 1798 1799 bif->bif_addrmax = req->ifbr_addrmax; 1800 return (0); 1801 } 1802 1803 static int 1804 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1805 { 1806 struct ifbreq *req = arg; 1807 struct bridge_iflist *bif = NULL; 1808 struct ifnet *ifs; 1809 1810 ifs = ifunit(req->ifbr_ifsname); 1811 if (ifs == NULL) 1812 return (ENOENT); 1813 1814 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1815 if (ifs == bif->bif_ifp) 1816 return (EBUSY); 1817 1818 if (ifs->if_bridge != NULL) 1819 return (EBUSY); 1820 1821 switch (ifs->if_type) { 1822 case IFT_ETHER: 1823 case IFT_GIF: 1824 case IFT_L2VLAN: 1825 break; 1826 default: 1827 return (EINVAL); 1828 } 1829 1830 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1831 if (bif == NULL) 1832 return (ENOMEM); 1833 1834 bif->bif_ifp = ifs; 1835 bif->bif_flags = IFBIF_SPAN; 1836 1837 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1838 1839 return (0); 1840 } 1841 1842 static int 1843 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1844 { 1845 struct ifbreq *req = arg; 1846 struct bridge_iflist *bif; 1847 struct ifnet *ifs; 1848 1849 ifs = ifunit(req->ifbr_ifsname); 1850 if (ifs == NULL) 1851 return (ENOENT); 1852 1853 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1854 if (ifs == bif->bif_ifp) 1855 break; 1856 1857 if (bif == NULL) 1858 return (ENOENT); 1859 1860 bridge_delete_span(sc, bif); 1861 1862 return (0); 1863 } 1864 1865 static int 1866 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1867 { 1868 struct ifbropreq *req = arg; 1869 struct bstp_state *bs = &sc->sc_stp; 1870 struct bstp_port *root_port; 1871 1872 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1873 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1874 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1875 1876 root_port = bs->bs_root_port; 1877 if (root_port == NULL) 1878 req->ifbop_root_port = 0; 1879 else 1880 req->ifbop_root_port = root_port->bp_ifp->if_index; 1881 1882 req->ifbop_holdcount = bs->bs_txholdcount; 1883 req->ifbop_priority = bs->bs_bridge_priority; 1884 req->ifbop_protocol = bs->bs_protover; 1885 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1886 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1887 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1888 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1889 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1890 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1891 1892 return (0); 1893 } 1894 1895 static int 1896 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1897 { 1898 struct ifbrparam *param = arg; 1899 1900 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1901 return (0); 1902 } 1903 1904 static int 1905 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1906 { 1907 struct ifbpstpconf *bifstp = arg; 1908 struct bridge_iflist *bif; 1909 struct bstp_port *bp; 1910 struct ifbpstpreq bpreq; 1911 char *buf, *outbuf; 1912 int count, buflen, len, error = 0; 1913 1914 count = 0; 1915 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1916 if ((bif->bif_flags & IFBIF_STP) != 0) 1917 count++; 1918 } 1919 1920 buflen = sizeof(bpreq) * count; 1921 if (bifstp->ifbpstp_len == 0) { 1922 bifstp->ifbpstp_len = buflen; 1923 return (0); 1924 } 1925 1926 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1927 if (outbuf == NULL) 1928 return (ENOMEM); 1929 1930 count = 0; 1931 buf = outbuf; 1932 len = min(bifstp->ifbpstp_len, buflen); 1933 bzero(&bpreq, sizeof(bpreq)); 1934 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1935 if (len < sizeof(bpreq)) 1936 break; 1937 1938 if ((bif->bif_flags & IFBIF_STP) == 0) 1939 continue; 1940 1941 bp = &bif->bif_stp; 1942 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1943 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1944 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1945 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1946 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1947 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1948 1949 memcpy(buf, &bpreq, sizeof(bpreq)); 1950 count++; 1951 buf += sizeof(bpreq); 1952 len -= sizeof(bpreq); 1953 } 1954 1955 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1956 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1957 free(outbuf, M_TEMP); 1958 return (error); 1959 } 1960 1961 static int 1962 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1963 { 1964 struct ifbrparam *param = arg; 1965 1966 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1967 } 1968 1969 static int 1970 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1971 { 1972 struct ifbrparam *param = arg; 1973 1974 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1975 } 1976 1977 /* 1978 * bridge_ifdetach: 1979 * 1980 * Detach an interface from a bridge. Called when a member 1981 * interface is detaching. 1982 */ 1983 static void 1984 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1985 { 1986 struct bridge_softc *sc = ifp->if_bridge; 1987 struct bridge_iflist *bif; 1988 1989 if (ifp->if_flags & IFF_RENAMING) 1990 return; 1991 if (V_bridge_cloner == NULL) { 1992 /* 1993 * This detach handler can be called after 1994 * vnet_bridge_uninit(). Just return in that case. 1995 */ 1996 return; 1997 } 1998 /* Check if the interface is a bridge member */ 1999 if (sc != NULL) { 2000 BRIDGE_LOCK(sc); 2001 2002 bif = bridge_lookup_member_if(sc, ifp); 2003 if (bif != NULL) 2004 bridge_delete_member(sc, bif, 1); 2005 2006 BRIDGE_UNLOCK(sc); 2007 return; 2008 } 2009 2010 /* Check if the interface is a span port */ 2011 BRIDGE_LIST_LOCK(); 2012 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 2013 BRIDGE_LOCK(sc); 2014 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2015 if (ifp == bif->bif_ifp) { 2016 bridge_delete_span(sc, bif); 2017 break; 2018 } 2019 2020 BRIDGE_UNLOCK(sc); 2021 } 2022 BRIDGE_LIST_UNLOCK(); 2023 } 2024 2025 /* 2026 * bridge_init: 2027 * 2028 * Initialize a bridge interface. 2029 */ 2030 static void 2031 bridge_init(void *xsc) 2032 { 2033 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2034 struct ifnet *ifp = sc->sc_ifp; 2035 2036 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2037 return; 2038 2039 BRIDGE_LOCK(sc); 2040 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2041 bridge_timer, sc); 2042 2043 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2044 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2045 2046 BRIDGE_UNLOCK(sc); 2047 } 2048 2049 /* 2050 * bridge_stop: 2051 * 2052 * Stop the bridge interface. 2053 */ 2054 static void 2055 bridge_stop(struct ifnet *ifp, int disable) 2056 { 2057 struct bridge_softc *sc = ifp->if_softc; 2058 2059 BRIDGE_LOCK_ASSERT(sc); 2060 2061 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2062 return; 2063 2064 BRIDGE_RT_LOCK(sc); 2065 callout_stop(&sc->sc_brcallout); 2066 2067 bstp_stop(&sc->sc_stp); 2068 2069 bridge_rtflush(sc, IFBF_FLUSHDYN); 2070 BRIDGE_RT_UNLOCK(sc); 2071 2072 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2073 } 2074 2075 /* 2076 * bridge_enqueue: 2077 * 2078 * Enqueue a packet on a bridge member interface. 2079 * 2080 */ 2081 static int 2082 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2083 { 2084 int len, err = 0; 2085 short mflags; 2086 struct mbuf *m0; 2087 2088 /* We may be sending a fragment so traverse the mbuf */ 2089 for (; m; m = m0) { 2090 m0 = m->m_nextpkt; 2091 m->m_nextpkt = NULL; 2092 len = m->m_pkthdr.len; 2093 mflags = m->m_flags; 2094 2095 /* 2096 * If underlying interface can not do VLAN tag insertion itself 2097 * then attach a packet tag that holds it. 2098 */ 2099 if ((m->m_flags & M_VLANTAG) && 2100 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2101 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2102 if (m == NULL) { 2103 if_printf(dst_ifp, 2104 "unable to prepend VLAN header\n"); 2105 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2106 continue; 2107 } 2108 m->m_flags &= ~M_VLANTAG; 2109 } 2110 2111 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2112 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2113 int n; 2114 2115 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2116 m0 = m->m_nextpkt; 2117 m_freem(m); 2118 } 2119 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2120 break; 2121 } 2122 2123 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2124 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2125 if (mflags & M_MCAST) 2126 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2127 } 2128 2129 return (err); 2130 } 2131 2132 /* 2133 * bridge_dummynet: 2134 * 2135 * Receive a queued packet from dummynet and pass it on to the output 2136 * interface. 2137 * 2138 * The mbuf has the Ethernet header already attached. 2139 */ 2140 static void 2141 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2142 { 2143 struct bridge_softc *sc; 2144 2145 sc = ifp->if_bridge; 2146 2147 /* 2148 * The packet didnt originate from a member interface. This should only 2149 * ever happen if a member interface is removed while packets are 2150 * queued for it. 2151 */ 2152 if (sc == NULL) { 2153 m_freem(m); 2154 return; 2155 } 2156 2157 if (PFIL_HOOKED_OUT_46) { 2158 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2159 return; 2160 if (m == NULL) 2161 return; 2162 } 2163 2164 bridge_enqueue(sc, ifp, m); 2165 } 2166 2167 /* 2168 * bridge_output: 2169 * 2170 * Send output from a bridge member interface. This 2171 * performs the bridging function for locally originated 2172 * packets. 2173 * 2174 * The mbuf has the Ethernet header already attached. We must 2175 * enqueue or free the mbuf before returning. 2176 */ 2177 static int 2178 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2179 struct rtentry *rt) 2180 { 2181 struct ether_header *eh; 2182 struct ifnet *bifp, *dst_if; 2183 struct bridge_softc *sc; 2184 uint16_t vlan; 2185 2186 NET_EPOCH_ASSERT(); 2187 2188 if (m->m_len < ETHER_HDR_LEN) { 2189 m = m_pullup(m, ETHER_HDR_LEN); 2190 if (m == NULL) 2191 return (0); 2192 } 2193 2194 eh = mtod(m, struct ether_header *); 2195 sc = ifp->if_bridge; 2196 vlan = VLANTAGOF(m); 2197 2198 bifp = sc->sc_ifp; 2199 2200 /* 2201 * If bridge is down, but the original output interface is up, 2202 * go ahead and send out that interface. Otherwise, the packet 2203 * is dropped below. 2204 */ 2205 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2206 dst_if = ifp; 2207 goto sendunicast; 2208 } 2209 2210 /* 2211 * If the packet is a multicast, or we don't know a better way to 2212 * get there, send to all interfaces. 2213 */ 2214 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2215 dst_if = NULL; 2216 else 2217 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2218 /* Tap any traffic not passing back out the originating interface */ 2219 if (dst_if != ifp) 2220 ETHER_BPF_MTAP(bifp, m); 2221 if (dst_if == NULL) { 2222 struct bridge_iflist *bif; 2223 struct mbuf *mc; 2224 int used = 0; 2225 2226 bridge_span(sc, m); 2227 2228 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2229 dst_if = bif->bif_ifp; 2230 2231 if (dst_if->if_type == IFT_GIF) 2232 continue; 2233 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2234 continue; 2235 2236 /* 2237 * If this is not the original output interface, 2238 * and the interface is participating in spanning 2239 * tree, make sure the port is in a state that 2240 * allows forwarding. 2241 */ 2242 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2243 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2244 continue; 2245 2246 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2247 used = 1; 2248 mc = m; 2249 } else { 2250 mc = m_dup(m, M_NOWAIT); 2251 if (mc == NULL) { 2252 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2253 continue; 2254 } 2255 } 2256 2257 bridge_enqueue(sc, dst_if, mc); 2258 } 2259 if (used == 0) 2260 m_freem(m); 2261 return (0); 2262 } 2263 2264 sendunicast: 2265 /* 2266 * XXX Spanning tree consideration here? 2267 */ 2268 2269 bridge_span(sc, m); 2270 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2271 m_freem(m); 2272 return (0); 2273 } 2274 2275 bridge_enqueue(sc, dst_if, m); 2276 return (0); 2277 } 2278 2279 /* 2280 * bridge_transmit: 2281 * 2282 * Do output on a bridge. 2283 * 2284 */ 2285 static int 2286 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2287 { 2288 struct bridge_softc *sc; 2289 struct ether_header *eh; 2290 struct ifnet *dst_if; 2291 int error = 0; 2292 2293 sc = ifp->if_softc; 2294 2295 ETHER_BPF_MTAP(ifp, m); 2296 2297 eh = mtod(m, struct ether_header *); 2298 2299 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2300 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, DOT1Q_VID_NULL)) != 2301 NULL) { 2302 error = bridge_enqueue(sc, dst_if, m); 2303 } else 2304 bridge_broadcast(sc, ifp, m, 0); 2305 2306 return (error); 2307 } 2308 2309 #ifdef ALTQ 2310 static void 2311 bridge_altq_start(if_t ifp) 2312 { 2313 struct ifaltq *ifq = &ifp->if_snd; 2314 struct mbuf *m; 2315 2316 IFQ_LOCK(ifq); 2317 IFQ_DEQUEUE_NOLOCK(ifq, m); 2318 while (m != NULL) { 2319 bridge_transmit(ifp, m); 2320 IFQ_DEQUEUE_NOLOCK(ifq, m); 2321 } 2322 IFQ_UNLOCK(ifq); 2323 } 2324 2325 static int 2326 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2327 { 2328 int err; 2329 2330 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2331 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2332 if (err == 0) 2333 bridge_altq_start(ifp); 2334 } else 2335 err = bridge_transmit(ifp, m); 2336 2337 return (err); 2338 } 2339 #endif /* ALTQ */ 2340 2341 /* 2342 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2343 */ 2344 static void 2345 bridge_qflush(struct ifnet *ifp __unused) 2346 { 2347 } 2348 2349 /* 2350 * bridge_forward: 2351 * 2352 * The forwarding function of the bridge. 2353 * 2354 * NOTE: Releases the lock on return. 2355 */ 2356 static void 2357 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2358 struct mbuf *m) 2359 { 2360 struct bridge_iflist *dbif; 2361 struct ifnet *src_if, *dst_if, *ifp; 2362 struct ether_header *eh; 2363 uint16_t vlan; 2364 uint8_t *dst; 2365 int error; 2366 2367 NET_EPOCH_ASSERT(); 2368 2369 src_if = m->m_pkthdr.rcvif; 2370 ifp = sc->sc_ifp; 2371 2372 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2373 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2374 vlan = VLANTAGOF(m); 2375 2376 if ((sbif->bif_flags & IFBIF_STP) && 2377 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2378 goto drop; 2379 2380 eh = mtod(m, struct ether_header *); 2381 dst = eh->ether_dhost; 2382 2383 /* If the interface is learning, record the address. */ 2384 if (sbif->bif_flags & IFBIF_LEARNING) { 2385 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2386 sbif, 0, IFBAF_DYNAMIC); 2387 /* 2388 * If the interface has addresses limits then deny any source 2389 * that is not in the cache. 2390 */ 2391 if (error && sbif->bif_addrmax) 2392 goto drop; 2393 } 2394 2395 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2396 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2397 goto drop; 2398 2399 #ifdef DEV_NETMAP 2400 /* 2401 * Hand the packet to netmap only if it wasn't injected by netmap 2402 * itself. 2403 */ 2404 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2405 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2406 ifp->if_input(ifp, m); 2407 return; 2408 } 2409 m->m_flags &= ~M_BRIDGE_INJECT; 2410 #endif 2411 2412 /* 2413 * At this point, the port either doesn't participate 2414 * in spanning tree or it is in the forwarding state. 2415 */ 2416 2417 /* 2418 * If the packet is unicast, destined for someone on 2419 * "this" side of the bridge, drop it. 2420 */ 2421 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2422 dst_if = bridge_rtlookup(sc, dst, vlan); 2423 if (src_if == dst_if) 2424 goto drop; 2425 } else { 2426 /* 2427 * Check if its a reserved multicast address, any address 2428 * listed in 802.1D section 7.12.6 may not be forwarded by the 2429 * bridge. 2430 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2431 */ 2432 if (dst[0] == 0x01 && dst[1] == 0x80 && 2433 dst[2] == 0xc2 && dst[3] == 0x00 && 2434 dst[4] == 0x00 && dst[5] <= 0x0f) 2435 goto drop; 2436 2437 /* ...forward it to all interfaces. */ 2438 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2439 dst_if = NULL; 2440 } 2441 2442 /* 2443 * If we have a destination interface which is a member of our bridge, 2444 * OR this is a unicast packet, push it through the bpf(4) machinery. 2445 * For broadcast or multicast packets, don't bother because it will 2446 * be reinjected into ether_input. We do this before we pass the packets 2447 * through the pfil(9) framework, as it is possible that pfil(9) will 2448 * drop the packet, or possibly modify it, making it difficult to debug 2449 * firewall issues on the bridge. 2450 */ 2451 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2452 ETHER_BPF_MTAP(ifp, m); 2453 2454 /* run the packet filter */ 2455 if (PFIL_HOOKED_IN_46) { 2456 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2457 return; 2458 if (m == NULL) 2459 return; 2460 } 2461 2462 if (dst_if == NULL) { 2463 bridge_broadcast(sc, src_if, m, 1); 2464 return; 2465 } 2466 2467 /* 2468 * At this point, we're dealing with a unicast frame 2469 * going to a different interface. 2470 */ 2471 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2472 goto drop; 2473 2474 dbif = bridge_lookup_member_if(sc, dst_if); 2475 if (dbif == NULL) 2476 /* Not a member of the bridge (anymore?) */ 2477 goto drop; 2478 2479 /* Private segments can not talk to each other */ 2480 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2481 goto drop; 2482 2483 if ((dbif->bif_flags & IFBIF_STP) && 2484 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2485 goto drop; 2486 2487 if (PFIL_HOOKED_OUT_46) { 2488 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2489 return; 2490 if (m == NULL) 2491 return; 2492 } 2493 2494 bridge_enqueue(sc, dst_if, m); 2495 return; 2496 2497 drop: 2498 m_freem(m); 2499 } 2500 2501 /* 2502 * bridge_input: 2503 * 2504 * Receive input from a member interface. Queue the packet for 2505 * bridging if it is not for us. 2506 */ 2507 static struct mbuf * 2508 bridge_input(struct ifnet *ifp, struct mbuf *m) 2509 { 2510 struct bridge_softc *sc; 2511 struct bridge_iflist *bif, *bif2; 2512 struct ifnet *bifp; 2513 struct ether_header *eh; 2514 struct mbuf *mc, *mc2; 2515 uint16_t vlan; 2516 int error; 2517 2518 NET_EPOCH_ASSERT(); 2519 2520 eh = mtod(m, struct ether_header *); 2521 vlan = VLANTAGOF(m); 2522 2523 sc = ifp->if_bridge; 2524 if (sc == NULL) { 2525 /* 2526 * This packet originated from the bridge itself, so it must 2527 * have been transmitted by netmap. Derive the "source" 2528 * interface from the source address and drop the packet if the 2529 * source address isn't known. 2530 */ 2531 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2532 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2533 sc = if_getsoftc(ifp); 2534 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2535 if (ifp == NULL) { 2536 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2537 m_freem(m); 2538 return (NULL); 2539 } 2540 m->m_pkthdr.rcvif = ifp; 2541 } 2542 bifp = sc->sc_ifp; 2543 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2544 return (m); 2545 2546 /* 2547 * Implement support for bridge monitoring. If this flag has been 2548 * set on this interface, discard the packet once we push it through 2549 * the bpf(4) machinery, but before we do, increment the byte and 2550 * packet counters associated with this interface. 2551 */ 2552 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2553 m->m_pkthdr.rcvif = bifp; 2554 ETHER_BPF_MTAP(bifp, m); 2555 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2556 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2557 m_freem(m); 2558 return (NULL); 2559 } 2560 bif = bridge_lookup_member_if(sc, ifp); 2561 if (bif == NULL) { 2562 return (m); 2563 } 2564 2565 bridge_span(sc, m); 2566 2567 if (m->m_flags & (M_BCAST|M_MCAST)) { 2568 /* Tap off 802.1D packets; they do not get forwarded. */ 2569 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2570 ETHER_ADDR_LEN) == 0) { 2571 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2572 return (NULL); 2573 } 2574 2575 if ((bif->bif_flags & IFBIF_STP) && 2576 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2577 return (m); 2578 } 2579 2580 /* 2581 * Make a deep copy of the packet and enqueue the copy 2582 * for bridge processing; return the original packet for 2583 * local processing. 2584 */ 2585 mc = m_dup(m, M_NOWAIT); 2586 if (mc == NULL) { 2587 return (m); 2588 } 2589 2590 /* Perform the bridge forwarding function with the copy. */ 2591 bridge_forward(sc, bif, mc); 2592 2593 #ifdef DEV_NETMAP 2594 /* 2595 * If netmap is enabled and has not already seen this packet, 2596 * then it will be consumed by bridge_forward(). 2597 */ 2598 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2599 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2600 m_freem(m); 2601 return (NULL); 2602 } 2603 #endif 2604 2605 /* 2606 * Reinject the mbuf as arriving on the bridge so we have a 2607 * chance at claiming multicast packets. We can not loop back 2608 * here from ether_input as a bridge is never a member of a 2609 * bridge. 2610 */ 2611 KASSERT(bifp->if_bridge == NULL, 2612 ("loop created in bridge_input")); 2613 mc2 = m_dup(m, M_NOWAIT); 2614 if (mc2 != NULL) { 2615 /* Keep the layer3 header aligned */ 2616 int i = min(mc2->m_pkthdr.len, max_protohdr); 2617 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2618 } 2619 if (mc2 != NULL) { 2620 mc2->m_pkthdr.rcvif = bifp; 2621 mc2->m_flags &= ~M_BRIDGE_INJECT; 2622 sc->sc_if_input(bifp, mc2); 2623 } 2624 2625 /* Return the original packet for local processing. */ 2626 return (m); 2627 } 2628 2629 if ((bif->bif_flags & IFBIF_STP) && 2630 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2631 return (m); 2632 } 2633 2634 #if defined(INET) || defined(INET6) 2635 #define CARP_CHECK_WE_ARE_DST(iface) \ 2636 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 2637 #define CARP_CHECK_WE_ARE_SRC(iface) \ 2638 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 2639 #else 2640 #define CARP_CHECK_WE_ARE_DST(iface) false 2641 #define CARP_CHECK_WE_ARE_SRC(iface) false 2642 #endif 2643 2644 #ifdef DEV_NETMAP 2645 #define GRAB_FOR_NETMAP(ifp, m) do { \ 2646 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 2647 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 2648 (ifp)->if_input(ifp, m); \ 2649 return (NULL); \ 2650 } \ 2651 } while (0) 2652 #else 2653 #define GRAB_FOR_NETMAP(ifp, m) 2654 #endif 2655 2656 #define GRAB_OUR_PACKETS(iface) \ 2657 if ((iface)->if_type == IFT_GIF) \ 2658 continue; \ 2659 /* It is destined for us. */ \ 2660 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 2661 CARP_CHECK_WE_ARE_DST(iface)) { \ 2662 if (bif->bif_flags & IFBIF_LEARNING) { \ 2663 error = bridge_rtupdate(sc, eh->ether_shost, \ 2664 vlan, bif, 0, IFBAF_DYNAMIC); \ 2665 if (error && bif->bif_addrmax) { \ 2666 m_freem(m); \ 2667 return (NULL); \ 2668 } \ 2669 } \ 2670 m->m_pkthdr.rcvif = iface; \ 2671 if ((iface) == ifp) { \ 2672 /* Skip bridge processing... src == dest */ \ 2673 return (m); \ 2674 } \ 2675 /* It's passing over or to the bridge, locally. */ \ 2676 ETHER_BPF_MTAP(bifp, m); \ 2677 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2678 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 2679 /* Hand the packet over to netmap if necessary. */ \ 2680 GRAB_FOR_NETMAP(bifp, m); \ 2681 /* Filter on the physical interface. */ \ 2682 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \ 2683 if (bridge_pfil(&m, NULL, ifp, \ 2684 PFIL_IN) != 0 || m == NULL) { \ 2685 return (NULL); \ 2686 } \ 2687 } \ 2688 if ((iface) != bifp) \ 2689 ETHER_BPF_MTAP(iface, m); \ 2690 return (m); \ 2691 } \ 2692 \ 2693 /* We just received a packet that we sent out. */ \ 2694 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 2695 CARP_CHECK_WE_ARE_SRC(iface)) { \ 2696 m_freem(m); \ 2697 return (NULL); \ 2698 } 2699 2700 /* 2701 * Unicast. Make sure it's not for the bridge. 2702 */ 2703 do { GRAB_OUR_PACKETS(bifp) } while (0); 2704 2705 /* 2706 * Give a chance for ifp at first priority. This will help when the 2707 * packet comes through the interface like VLAN's with the same MACs 2708 * on several interfaces from the same bridge. This also will save 2709 * some CPU cycles in case the destination interface and the input 2710 * interface (eq ifp) are the same. 2711 */ 2712 do { GRAB_OUR_PACKETS(ifp) } while (0); 2713 2714 /* Now check the all bridge members. */ 2715 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2716 GRAB_OUR_PACKETS(bif2->bif_ifp) 2717 } 2718 2719 #undef CARP_CHECK_WE_ARE_DST 2720 #undef CARP_CHECK_WE_ARE_SRC 2721 #undef GRAB_FOR_NETMAP 2722 #undef GRAB_OUR_PACKETS 2723 2724 /* Perform the bridge forwarding function. */ 2725 bridge_forward(sc, bif, m); 2726 2727 return (NULL); 2728 } 2729 2730 /* 2731 * Inject a packet back into the host ethernet stack. This will generally only 2732 * be used by netmap when an application writes to the host TX ring. The 2733 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 2734 * interface after ethernet processing. 2735 */ 2736 static void 2737 bridge_inject(struct ifnet *ifp, struct mbuf *m) 2738 { 2739 struct bridge_softc *sc; 2740 2741 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 2742 ("%s: iface %s is not running in netmap mode", 2743 __func__, if_name(ifp))); 2744 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 2745 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 2746 2747 m->m_flags |= M_BRIDGE_INJECT; 2748 sc = if_getsoftc(ifp); 2749 sc->sc_if_input(ifp, m); 2750 } 2751 2752 /* 2753 * bridge_broadcast: 2754 * 2755 * Send a frame to all interfaces that are members of 2756 * the bridge, except for the one on which the packet 2757 * arrived. 2758 * 2759 * NOTE: Releases the lock on return. 2760 */ 2761 static void 2762 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2763 struct mbuf *m, int runfilt) 2764 { 2765 struct bridge_iflist *dbif, *sbif; 2766 struct mbuf *mc; 2767 struct ifnet *dst_if; 2768 int used = 0, i; 2769 2770 NET_EPOCH_ASSERT(); 2771 2772 sbif = bridge_lookup_member_if(sc, src_if); 2773 2774 /* Filter on the bridge interface before broadcasting */ 2775 if (runfilt && PFIL_HOOKED_OUT_46) { 2776 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2777 return; 2778 if (m == NULL) 2779 return; 2780 } 2781 2782 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2783 dst_if = dbif->bif_ifp; 2784 if (dst_if == src_if) 2785 continue; 2786 2787 /* Private segments can not talk to each other */ 2788 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2789 continue; 2790 2791 if ((dbif->bif_flags & IFBIF_STP) && 2792 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2793 continue; 2794 2795 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2796 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2797 continue; 2798 2799 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2800 continue; 2801 2802 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2803 mc = m; 2804 used = 1; 2805 } else { 2806 mc = m_dup(m, M_NOWAIT); 2807 if (mc == NULL) { 2808 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2809 continue; 2810 } 2811 } 2812 2813 /* 2814 * Filter on the output interface. Pass a NULL bridge interface 2815 * pointer so we do not redundantly filter on the bridge for 2816 * each interface we broadcast on. 2817 */ 2818 if (runfilt && PFIL_HOOKED_OUT_46) { 2819 if (used == 0) { 2820 /* Keep the layer3 header aligned */ 2821 i = min(mc->m_pkthdr.len, max_protohdr); 2822 mc = m_copyup(mc, i, ETHER_ALIGN); 2823 if (mc == NULL) { 2824 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2825 continue; 2826 } 2827 } 2828 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2829 continue; 2830 if (mc == NULL) 2831 continue; 2832 } 2833 2834 bridge_enqueue(sc, dst_if, mc); 2835 } 2836 if (used == 0) 2837 m_freem(m); 2838 } 2839 2840 /* 2841 * bridge_span: 2842 * 2843 * Duplicate a packet out one or more interfaces that are in span mode, 2844 * the original mbuf is unmodified. 2845 */ 2846 static void 2847 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2848 { 2849 struct bridge_iflist *bif; 2850 struct ifnet *dst_if; 2851 struct mbuf *mc; 2852 2853 NET_EPOCH_ASSERT(); 2854 2855 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2856 return; 2857 2858 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2859 dst_if = bif->bif_ifp; 2860 2861 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2862 continue; 2863 2864 mc = m_dup(m, M_NOWAIT); 2865 if (mc == NULL) { 2866 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2867 continue; 2868 } 2869 2870 bridge_enqueue(sc, dst_if, mc); 2871 } 2872 } 2873 2874 /* 2875 * bridge_rtupdate: 2876 * 2877 * Add a bridge routing entry. 2878 */ 2879 static int 2880 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2881 struct bridge_iflist *bif, int setflags, uint8_t flags) 2882 { 2883 struct bridge_rtnode *brt; 2884 struct bridge_iflist *obif; 2885 int error; 2886 2887 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2888 2889 /* Check the source address is valid and not multicast. */ 2890 if (ETHER_IS_MULTICAST(dst) || 2891 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2892 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2893 return (EINVAL); 2894 2895 /* 2896 * A route for this destination might already exist. If so, 2897 * update it, otherwise create a new one. 2898 */ 2899 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2900 BRIDGE_RT_LOCK(sc); 2901 2902 /* Check again, now that we have the lock. There could have 2903 * been a race and we only want to insert this once. */ 2904 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 2905 BRIDGE_RT_UNLOCK(sc); 2906 return (0); 2907 } 2908 2909 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2910 sc->sc_brtexceeded++; 2911 BRIDGE_RT_UNLOCK(sc); 2912 return (ENOSPC); 2913 } 2914 /* Check per interface address limits (if enabled) */ 2915 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2916 bif->bif_addrexceeded++; 2917 BRIDGE_RT_UNLOCK(sc); 2918 return (ENOSPC); 2919 } 2920 2921 /* 2922 * Allocate a new bridge forwarding node, and 2923 * initialize the expiration time and Ethernet 2924 * address. 2925 */ 2926 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2927 if (brt == NULL) { 2928 BRIDGE_RT_UNLOCK(sc); 2929 return (ENOMEM); 2930 } 2931 brt->brt_vnet = curvnet; 2932 2933 if (bif->bif_flags & IFBIF_STICKY) 2934 brt->brt_flags = IFBAF_STICKY; 2935 else 2936 brt->brt_flags = IFBAF_DYNAMIC; 2937 2938 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2939 brt->brt_vlan = vlan; 2940 2941 brt->brt_dst = bif; 2942 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2943 uma_zfree(V_bridge_rtnode_zone, brt); 2944 BRIDGE_RT_UNLOCK(sc); 2945 return (error); 2946 } 2947 bif->bif_addrcnt++; 2948 2949 BRIDGE_RT_UNLOCK(sc); 2950 } 2951 2952 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2953 (obif = brt->brt_dst) != bif) { 2954 MPASS(obif != NULL); 2955 2956 BRIDGE_RT_LOCK(sc); 2957 brt->brt_dst->bif_addrcnt--; 2958 brt->brt_dst = bif; 2959 brt->brt_dst->bif_addrcnt++; 2960 BRIDGE_RT_UNLOCK(sc); 2961 2962 if (V_log_mac_flap && 2963 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 2964 log(LOG_NOTICE, 2965 "%s: mac address %6D vlan %d moved from %s to %s\n", 2966 sc->sc_ifp->if_xname, 2967 &brt->brt_addr[0], ":", 2968 brt->brt_vlan, 2969 obif->bif_ifp->if_xname, 2970 bif->bif_ifp->if_xname); 2971 } 2972 } 2973 2974 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2975 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2976 if (setflags) 2977 brt->brt_flags = flags; 2978 2979 return (0); 2980 } 2981 2982 /* 2983 * bridge_rtlookup: 2984 * 2985 * Lookup the destination interface for an address. 2986 */ 2987 static struct ifnet * 2988 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2989 { 2990 struct bridge_rtnode *brt; 2991 2992 NET_EPOCH_ASSERT(); 2993 2994 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2995 return (NULL); 2996 2997 return (brt->brt_ifp); 2998 } 2999 3000 /* 3001 * bridge_rttrim: 3002 * 3003 * Trim the routine table so that we have a number 3004 * of routing entries less than or equal to the 3005 * maximum number. 3006 */ 3007 static void 3008 bridge_rttrim(struct bridge_softc *sc) 3009 { 3010 struct bridge_rtnode *brt, *nbrt; 3011 3012 NET_EPOCH_ASSERT(); 3013 BRIDGE_RT_LOCK_ASSERT(sc); 3014 3015 /* Make sure we actually need to do this. */ 3016 if (sc->sc_brtcnt <= sc->sc_brtmax) 3017 return; 3018 3019 /* Force an aging cycle; this might trim enough addresses. */ 3020 bridge_rtage(sc); 3021 if (sc->sc_brtcnt <= sc->sc_brtmax) 3022 return; 3023 3024 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3025 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3026 bridge_rtnode_destroy(sc, brt); 3027 if (sc->sc_brtcnt <= sc->sc_brtmax) 3028 return; 3029 } 3030 } 3031 } 3032 3033 /* 3034 * bridge_timer: 3035 * 3036 * Aging timer for the bridge. 3037 */ 3038 static void 3039 bridge_timer(void *arg) 3040 { 3041 struct bridge_softc *sc = arg; 3042 3043 BRIDGE_RT_LOCK_ASSERT(sc); 3044 3045 /* Destruction of rtnodes requires a proper vnet context */ 3046 CURVNET_SET(sc->sc_ifp->if_vnet); 3047 bridge_rtage(sc); 3048 3049 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3050 callout_reset(&sc->sc_brcallout, 3051 bridge_rtable_prune_period * hz, bridge_timer, sc); 3052 CURVNET_RESTORE(); 3053 } 3054 3055 /* 3056 * bridge_rtage: 3057 * 3058 * Perform an aging cycle. 3059 */ 3060 static void 3061 bridge_rtage(struct bridge_softc *sc) 3062 { 3063 struct bridge_rtnode *brt, *nbrt; 3064 3065 BRIDGE_RT_LOCK_ASSERT(sc); 3066 3067 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3068 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3069 if (time_uptime >= brt->brt_expire) 3070 bridge_rtnode_destroy(sc, brt); 3071 } 3072 } 3073 } 3074 3075 /* 3076 * bridge_rtflush: 3077 * 3078 * Remove all dynamic addresses from the bridge. 3079 */ 3080 static void 3081 bridge_rtflush(struct bridge_softc *sc, int full) 3082 { 3083 struct bridge_rtnode *brt, *nbrt; 3084 3085 BRIDGE_RT_LOCK_ASSERT(sc); 3086 3087 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3088 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3089 bridge_rtnode_destroy(sc, brt); 3090 } 3091 } 3092 3093 /* 3094 * bridge_rtdaddr: 3095 * 3096 * Remove an address from the table. 3097 */ 3098 static int 3099 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3100 { 3101 struct bridge_rtnode *brt; 3102 int found = 0; 3103 3104 BRIDGE_RT_LOCK(sc); 3105 3106 /* 3107 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans 3108 * so the lookup may return more than one. 3109 */ 3110 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3111 bridge_rtnode_destroy(sc, brt); 3112 found = 1; 3113 } 3114 3115 BRIDGE_RT_UNLOCK(sc); 3116 3117 return (found ? 0 : ENOENT); 3118 } 3119 3120 /* 3121 * bridge_rtdelete: 3122 * 3123 * Delete routes to a speicifc member interface. 3124 */ 3125 static void 3126 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3127 { 3128 struct bridge_rtnode *brt, *nbrt; 3129 3130 BRIDGE_RT_LOCK_ASSERT(sc); 3131 3132 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3133 if (brt->brt_ifp == ifp && (full || 3134 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3135 bridge_rtnode_destroy(sc, brt); 3136 } 3137 } 3138 3139 /* 3140 * bridge_rtable_init: 3141 * 3142 * Initialize the route table for this bridge. 3143 */ 3144 static void 3145 bridge_rtable_init(struct bridge_softc *sc) 3146 { 3147 int i; 3148 3149 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3150 M_DEVBUF, M_WAITOK); 3151 3152 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3153 CK_LIST_INIT(&sc->sc_rthash[i]); 3154 3155 sc->sc_rthash_key = arc4random(); 3156 CK_LIST_INIT(&sc->sc_rtlist); 3157 } 3158 3159 /* 3160 * bridge_rtable_fini: 3161 * 3162 * Deconstruct the route table for this bridge. 3163 */ 3164 static void 3165 bridge_rtable_fini(struct bridge_softc *sc) 3166 { 3167 3168 KASSERT(sc->sc_brtcnt == 0, 3169 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3170 free(sc->sc_rthash, M_DEVBUF); 3171 } 3172 3173 /* 3174 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3175 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3176 */ 3177 #define mix(a, b, c) \ 3178 do { \ 3179 a -= b; a -= c; a ^= (c >> 13); \ 3180 b -= c; b -= a; b ^= (a << 8); \ 3181 c -= a; c -= b; c ^= (b >> 13); \ 3182 a -= b; a -= c; a ^= (c >> 12); \ 3183 b -= c; b -= a; b ^= (a << 16); \ 3184 c -= a; c -= b; c ^= (b >> 5); \ 3185 a -= b; a -= c; a ^= (c >> 3); \ 3186 b -= c; b -= a; b ^= (a << 10); \ 3187 c -= a; c -= b; c ^= (b >> 15); \ 3188 } while (/*CONSTCOND*/0) 3189 3190 static __inline uint32_t 3191 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3192 { 3193 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3194 3195 b += addr[5] << 8; 3196 b += addr[4]; 3197 a += addr[3] << 24; 3198 a += addr[2] << 16; 3199 a += addr[1] << 8; 3200 a += addr[0]; 3201 3202 mix(a, b, c); 3203 3204 return (c & BRIDGE_RTHASH_MASK); 3205 } 3206 3207 #undef mix 3208 3209 static int 3210 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3211 { 3212 int i, d; 3213 3214 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3215 d = ((int)a[i]) - ((int)b[i]); 3216 } 3217 3218 return (d); 3219 } 3220 3221 /* 3222 * bridge_rtnode_lookup: 3223 * 3224 * Look up a bridge route node for the specified destination. Compare the 3225 * vlan id or if zero then just return the first match. 3226 */ 3227 static struct bridge_rtnode * 3228 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3229 { 3230 struct bridge_rtnode *brt; 3231 uint32_t hash; 3232 int dir; 3233 3234 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3235 3236 hash = bridge_rthash(sc, addr); 3237 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3238 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3239 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL)) 3240 return (brt); 3241 if (dir > 0) 3242 return (NULL); 3243 } 3244 3245 return (NULL); 3246 } 3247 3248 /* 3249 * bridge_rtnode_insert: 3250 * 3251 * Insert the specified bridge node into the route table. We 3252 * assume the entry is not already in the table. 3253 */ 3254 static int 3255 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3256 { 3257 struct bridge_rtnode *lbrt; 3258 uint32_t hash; 3259 int dir; 3260 3261 BRIDGE_RT_LOCK_ASSERT(sc); 3262 3263 hash = bridge_rthash(sc, brt->brt_addr); 3264 3265 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3266 if (lbrt == NULL) { 3267 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3268 goto out; 3269 } 3270 3271 do { 3272 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3273 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3274 return (EEXIST); 3275 if (dir > 0) { 3276 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3277 goto out; 3278 } 3279 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3280 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3281 goto out; 3282 } 3283 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3284 } while (lbrt != NULL); 3285 3286 #ifdef DIAGNOSTIC 3287 panic("bridge_rtnode_insert: impossible"); 3288 #endif 3289 3290 out: 3291 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3292 sc->sc_brtcnt++; 3293 3294 return (0); 3295 } 3296 3297 static void 3298 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3299 { 3300 struct bridge_rtnode *brt; 3301 3302 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3303 3304 CURVNET_SET(brt->brt_vnet); 3305 uma_zfree(V_bridge_rtnode_zone, brt); 3306 CURVNET_RESTORE(); 3307 } 3308 3309 /* 3310 * bridge_rtnode_destroy: 3311 * 3312 * Destroy a bridge rtnode. 3313 */ 3314 static void 3315 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3316 { 3317 BRIDGE_RT_LOCK_ASSERT(sc); 3318 3319 CK_LIST_REMOVE(brt, brt_hash); 3320 3321 CK_LIST_REMOVE(brt, brt_list); 3322 sc->sc_brtcnt--; 3323 brt->brt_dst->bif_addrcnt--; 3324 3325 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3326 } 3327 3328 /* 3329 * bridge_rtable_expire: 3330 * 3331 * Set the expiry time for all routes on an interface. 3332 */ 3333 static void 3334 bridge_rtable_expire(struct ifnet *ifp, int age) 3335 { 3336 struct bridge_softc *sc = ifp->if_bridge; 3337 struct bridge_rtnode *brt; 3338 3339 CURVNET_SET(ifp->if_vnet); 3340 BRIDGE_RT_LOCK(sc); 3341 3342 /* 3343 * If the age is zero then flush, otherwise set all the expiry times to 3344 * age for the interface 3345 */ 3346 if (age == 0) 3347 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3348 else { 3349 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3350 /* Cap the expiry time to 'age' */ 3351 if (brt->brt_ifp == ifp && 3352 brt->brt_expire > time_uptime + age && 3353 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3354 brt->brt_expire = time_uptime + age; 3355 } 3356 } 3357 BRIDGE_RT_UNLOCK(sc); 3358 CURVNET_RESTORE(); 3359 } 3360 3361 /* 3362 * bridge_state_change: 3363 * 3364 * Callback from the bridgestp code when a port changes states. 3365 */ 3366 static void 3367 bridge_state_change(struct ifnet *ifp, int state) 3368 { 3369 struct bridge_softc *sc = ifp->if_bridge; 3370 static const char *stpstates[] = { 3371 "disabled", 3372 "listening", 3373 "learning", 3374 "forwarding", 3375 "blocking", 3376 "discarding" 3377 }; 3378 3379 CURVNET_SET(ifp->if_vnet); 3380 if (V_log_stp) 3381 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3382 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3383 CURVNET_RESTORE(); 3384 } 3385 3386 /* 3387 * Send bridge packets through pfil if they are one of the types pfil can deal 3388 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3389 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3390 * that interface. 3391 */ 3392 static int 3393 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3394 { 3395 int snap, error, i; 3396 struct ether_header *eh1, eh2; 3397 struct llc llc1; 3398 u_int16_t ether_type; 3399 pfil_return_t rv; 3400 #ifdef INET 3401 struct ip *ip = NULL; 3402 int hlen = 0; 3403 #endif 3404 3405 snap = 0; 3406 error = -1; /* Default error if not error == 0 */ 3407 3408 #if 0 3409 /* we may return with the IP fields swapped, ensure its not shared */ 3410 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3411 #endif 3412 3413 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3414 return (0); /* filtering is disabled */ 3415 3416 i = min((*mp)->m_pkthdr.len, max_protohdr); 3417 if ((*mp)->m_len < i) { 3418 *mp = m_pullup(*mp, i); 3419 if (*mp == NULL) { 3420 printf("%s: m_pullup failed\n", __func__); 3421 return (-1); 3422 } 3423 } 3424 3425 eh1 = mtod(*mp, struct ether_header *); 3426 ether_type = ntohs(eh1->ether_type); 3427 3428 /* 3429 * Check for SNAP/LLC. 3430 */ 3431 if (ether_type < ETHERMTU) { 3432 struct llc *llc2 = (struct llc *)(eh1 + 1); 3433 3434 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3435 llc2->llc_dsap == LLC_SNAP_LSAP && 3436 llc2->llc_ssap == LLC_SNAP_LSAP && 3437 llc2->llc_control == LLC_UI) { 3438 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3439 snap = 1; 3440 } 3441 } 3442 3443 /* 3444 * If we're trying to filter bridge traffic, only look at traffic for 3445 * protocols available in the kernel (IPv4 and/or IPv6) to avoid 3446 * passing traffic for an unsupported protocol to the filter. This is 3447 * lame since if we really wanted, say, an AppleTalk filter, we are 3448 * hosed, but of course we don't have an AppleTalk filter to begin 3449 * with. (Note that since pfil doesn't understand ARP it will pass 3450 * *ALL* ARP traffic.) 3451 */ 3452 switch (ether_type) { 3453 #ifdef INET 3454 case ETHERTYPE_ARP: 3455 case ETHERTYPE_REVARP: 3456 if (V_pfil_ipfw_arp == 0) 3457 return (0); /* Automatically pass */ 3458 3459 /* FALLTHROUGH */ 3460 case ETHERTYPE_IP: 3461 #endif 3462 #ifdef INET6 3463 case ETHERTYPE_IPV6: 3464 #endif /* INET6 */ 3465 break; 3466 3467 default: 3468 /* 3469 * We get here if the packet isn't from a supported 3470 * protocol. Check to see if the user wants to pass 3471 * non-IP packets, these will not be checked by pfil(9) 3472 * and passed unconditionally so the default is to 3473 * drop. 3474 */ 3475 if (V_pfil_onlyip) 3476 goto bad; 3477 } 3478 3479 /* Run the packet through pfil before stripping link headers */ 3480 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3481 dir == PFIL_OUT && ifp != NULL) { 3482 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 3483 case PFIL_DROPPED: 3484 return (EACCES); 3485 case PFIL_CONSUMED: 3486 return (0); 3487 } 3488 } 3489 3490 /* Strip off the Ethernet header and keep a copy. */ 3491 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3492 m_adj(*mp, ETHER_HDR_LEN); 3493 3494 /* Strip off snap header, if present */ 3495 if (snap) { 3496 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3497 m_adj(*mp, sizeof(struct llc)); 3498 } 3499 3500 /* 3501 * Check the IP header for alignment and errors 3502 */ 3503 if (dir == PFIL_IN) { 3504 switch (ether_type) { 3505 #ifdef INET 3506 case ETHERTYPE_IP: 3507 error = bridge_ip_checkbasic(mp); 3508 break; 3509 #endif 3510 #ifdef INET6 3511 case ETHERTYPE_IPV6: 3512 error = bridge_ip6_checkbasic(mp); 3513 break; 3514 #endif /* INET6 */ 3515 default: 3516 error = 0; 3517 } 3518 if (error) 3519 goto bad; 3520 } 3521 3522 error = 0; 3523 3524 /* 3525 * Run the packet through pfil 3526 */ 3527 rv = PFIL_PASS; 3528 switch (ether_type) { 3529 #ifdef INET 3530 case ETHERTYPE_IP: 3531 /* 3532 * Run pfil on the member interface and the bridge, both can 3533 * be skipped by clearing pfil_member or pfil_bridge. 3534 * 3535 * Keep the order: 3536 * in_if -> bridge_if -> out_if 3537 */ 3538 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3539 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 3540 PFIL_PASS) 3541 break; 3542 3543 if (V_pfil_member && ifp != NULL) { 3544 rv = (dir == PFIL_OUT) ? 3545 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 3546 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 3547 if (rv != PFIL_PASS) 3548 break; 3549 } 3550 3551 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3552 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 3553 PFIL_PASS) 3554 break; 3555 3556 /* check if we need to fragment the packet */ 3557 /* bridge_fragment generates a mbuf chain of packets */ 3558 /* that already include eth headers */ 3559 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3560 i = (*mp)->m_pkthdr.len; 3561 if (i > ifp->if_mtu) { 3562 error = bridge_fragment(ifp, mp, &eh2, snap, 3563 &llc1); 3564 return (error); 3565 } 3566 } 3567 3568 /* Recalculate the ip checksum. */ 3569 ip = mtod(*mp, struct ip *); 3570 hlen = ip->ip_hl << 2; 3571 if (hlen < sizeof(struct ip)) 3572 goto bad; 3573 if (hlen > (*mp)->m_len) { 3574 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3575 goto bad; 3576 ip = mtod(*mp, struct ip *); 3577 if (ip == NULL) 3578 goto bad; 3579 } 3580 ip->ip_sum = 0; 3581 if (hlen == sizeof(struct ip)) 3582 ip->ip_sum = in_cksum_hdr(ip); 3583 else 3584 ip->ip_sum = in_cksum(*mp, hlen); 3585 3586 break; 3587 #endif /* INET */ 3588 #ifdef INET6 3589 case ETHERTYPE_IPV6: 3590 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3591 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 3592 PFIL_PASS) 3593 break; 3594 3595 if (V_pfil_member && ifp != NULL) { 3596 rv = (dir == PFIL_OUT) ? 3597 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 3598 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 3599 if (rv != PFIL_PASS) 3600 break; 3601 } 3602 3603 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3604 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 3605 PFIL_PASS) 3606 break; 3607 break; 3608 #endif 3609 } 3610 3611 switch (rv) { 3612 case PFIL_CONSUMED: 3613 return (0); 3614 case PFIL_DROPPED: 3615 return (EACCES); 3616 default: 3617 break; 3618 } 3619 3620 error = -1; 3621 3622 /* 3623 * Finally, put everything back the way it was and return 3624 */ 3625 if (snap) { 3626 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3627 if (*mp == NULL) 3628 return (error); 3629 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3630 } 3631 3632 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3633 if (*mp == NULL) 3634 return (error); 3635 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3636 3637 return (0); 3638 3639 bad: 3640 m_freem(*mp); 3641 *mp = NULL; 3642 return (error); 3643 } 3644 3645 #ifdef INET 3646 /* 3647 * Perform basic checks on header size since 3648 * pfil assumes ip_input has already processed 3649 * it for it. Cut-and-pasted from ip_input.c. 3650 * Given how simple the IPv6 version is, 3651 * does the IPv4 version really need to be 3652 * this complicated? 3653 * 3654 * XXX Should we update ipstat here, or not? 3655 * XXX Right now we update ipstat but not 3656 * XXX csum_counter. 3657 */ 3658 static int 3659 bridge_ip_checkbasic(struct mbuf **mp) 3660 { 3661 struct mbuf *m = *mp; 3662 struct ip *ip; 3663 int len, hlen; 3664 u_short sum; 3665 3666 if (*mp == NULL) 3667 return (-1); 3668 3669 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3670 if ((m = m_copyup(m, sizeof(struct ip), 3671 (max_linkhdr + 3) & ~3)) == NULL) { 3672 /* XXXJRT new stat, please */ 3673 KMOD_IPSTAT_INC(ips_toosmall); 3674 goto bad; 3675 } 3676 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3677 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3678 KMOD_IPSTAT_INC(ips_toosmall); 3679 goto bad; 3680 } 3681 } 3682 ip = mtod(m, struct ip *); 3683 if (ip == NULL) goto bad; 3684 3685 if (ip->ip_v != IPVERSION) { 3686 KMOD_IPSTAT_INC(ips_badvers); 3687 goto bad; 3688 } 3689 hlen = ip->ip_hl << 2; 3690 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3691 KMOD_IPSTAT_INC(ips_badhlen); 3692 goto bad; 3693 } 3694 if (hlen > m->m_len) { 3695 if ((m = m_pullup(m, hlen)) == NULL) { 3696 KMOD_IPSTAT_INC(ips_badhlen); 3697 goto bad; 3698 } 3699 ip = mtod(m, struct ip *); 3700 if (ip == NULL) goto bad; 3701 } 3702 3703 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3704 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3705 } else { 3706 if (hlen == sizeof(struct ip)) { 3707 sum = in_cksum_hdr(ip); 3708 } else { 3709 sum = in_cksum(m, hlen); 3710 } 3711 } 3712 if (sum) { 3713 KMOD_IPSTAT_INC(ips_badsum); 3714 goto bad; 3715 } 3716 3717 /* Retrieve the packet length. */ 3718 len = ntohs(ip->ip_len); 3719 3720 /* 3721 * Check for additional length bogosity 3722 */ 3723 if (len < hlen) { 3724 KMOD_IPSTAT_INC(ips_badlen); 3725 goto bad; 3726 } 3727 3728 /* 3729 * Check that the amount of data in the buffers 3730 * is as at least much as the IP header would have us expect. 3731 * Drop packet if shorter than we expect. 3732 */ 3733 if (m->m_pkthdr.len < len) { 3734 KMOD_IPSTAT_INC(ips_tooshort); 3735 goto bad; 3736 } 3737 3738 /* Checks out, proceed */ 3739 *mp = m; 3740 return (0); 3741 3742 bad: 3743 *mp = m; 3744 return (-1); 3745 } 3746 #endif /* INET */ 3747 3748 #ifdef INET6 3749 /* 3750 * Same as above, but for IPv6. 3751 * Cut-and-pasted from ip6_input.c. 3752 * XXX Should we update ip6stat, or not? 3753 */ 3754 static int 3755 bridge_ip6_checkbasic(struct mbuf **mp) 3756 { 3757 struct mbuf *m = *mp; 3758 struct ip6_hdr *ip6; 3759 3760 /* 3761 * If the IPv6 header is not aligned, slurp it up into a new 3762 * mbuf with space for link headers, in the event we forward 3763 * it. Otherwise, if it is aligned, make sure the entire base 3764 * IPv6 header is in the first mbuf of the chain. 3765 */ 3766 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3767 struct ifnet *inifp = m->m_pkthdr.rcvif; 3768 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3769 (max_linkhdr + 3) & ~3)) == NULL) { 3770 /* XXXJRT new stat, please */ 3771 IP6STAT_INC(ip6s_toosmall); 3772 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3773 goto bad; 3774 } 3775 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3776 struct ifnet *inifp = m->m_pkthdr.rcvif; 3777 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3778 IP6STAT_INC(ip6s_toosmall); 3779 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3780 goto bad; 3781 } 3782 } 3783 3784 ip6 = mtod(m, struct ip6_hdr *); 3785 3786 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3787 IP6STAT_INC(ip6s_badvers); 3788 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3789 goto bad; 3790 } 3791 3792 /* Checks out, proceed */ 3793 *mp = m; 3794 return (0); 3795 3796 bad: 3797 *mp = m; 3798 return (-1); 3799 } 3800 #endif /* INET6 */ 3801 3802 #ifdef INET 3803 /* 3804 * bridge_fragment: 3805 * 3806 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3807 */ 3808 static int 3809 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3810 int snap, struct llc *llc) 3811 { 3812 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3813 struct ip *ip; 3814 int error = -1; 3815 3816 if (m->m_len < sizeof(struct ip) && 3817 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3818 goto dropit; 3819 ip = mtod(m, struct ip *); 3820 3821 m->m_pkthdr.csum_flags |= CSUM_IP; 3822 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3823 if (error) 3824 goto dropit; 3825 3826 /* 3827 * Walk the chain and re-add the Ethernet header for 3828 * each mbuf packet. 3829 */ 3830 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3831 nextpkt = mcur->m_nextpkt; 3832 mcur->m_nextpkt = NULL; 3833 if (snap) { 3834 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3835 if (mcur == NULL) { 3836 error = ENOBUFS; 3837 if (mprev != NULL) 3838 mprev->m_nextpkt = nextpkt; 3839 goto dropit; 3840 } 3841 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3842 } 3843 3844 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3845 if (mcur == NULL) { 3846 error = ENOBUFS; 3847 if (mprev != NULL) 3848 mprev->m_nextpkt = nextpkt; 3849 goto dropit; 3850 } 3851 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3852 3853 /* 3854 * The previous two M_PREPEND could have inserted one or two 3855 * mbufs in front so we have to update the previous packet's 3856 * m_nextpkt. 3857 */ 3858 mcur->m_nextpkt = nextpkt; 3859 if (mprev != NULL) 3860 mprev->m_nextpkt = mcur; 3861 else { 3862 /* The first mbuf in the original chain needs to be 3863 * updated. */ 3864 *mp = mcur; 3865 } 3866 mprev = mcur; 3867 } 3868 3869 KMOD_IPSTAT_INC(ips_fragmented); 3870 return (error); 3871 3872 dropit: 3873 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3874 m = mcur->m_nextpkt; 3875 m_freem(mcur); 3876 } 3877 return (error); 3878 } 3879 #endif /* INET */ 3880 3881 static void 3882 bridge_linkstate(struct ifnet *ifp) 3883 { 3884 struct bridge_softc *sc = ifp->if_bridge; 3885 struct bridge_iflist *bif; 3886 struct epoch_tracker et; 3887 3888 NET_EPOCH_ENTER(et); 3889 3890 bif = bridge_lookup_member_if(sc, ifp); 3891 if (bif == NULL) { 3892 NET_EPOCH_EXIT(et); 3893 return; 3894 } 3895 bridge_linkcheck(sc); 3896 3897 bstp_linkstate(&bif->bif_stp); 3898 3899 NET_EPOCH_EXIT(et); 3900 } 3901 3902 static void 3903 bridge_linkcheck(struct bridge_softc *sc) 3904 { 3905 struct bridge_iflist *bif; 3906 int new_link, hasls; 3907 3908 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3909 3910 new_link = LINK_STATE_DOWN; 3911 hasls = 0; 3912 /* Our link is considered up if at least one of our ports is active */ 3913 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3914 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3915 hasls++; 3916 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3917 new_link = LINK_STATE_UP; 3918 break; 3919 } 3920 } 3921 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3922 /* If no interfaces support link-state then we default to up */ 3923 new_link = LINK_STATE_UP; 3924 } 3925 if_link_state_change(sc->sc_ifp, new_link); 3926 } 3927