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 "opt_inet.h" 80 #include "opt_inet6.h" 81 82 #define EXTERR_CATEGORY EXTERR_CAT_BRIDGE 83 84 #include <sys/param.h> 85 #include <sys/ctype.h> /* string functions */ 86 #include <sys/eventhandler.h> 87 #include <sys/exterrvar.h> 88 #include <sys/jail.h> 89 #include <sys/kernel.h> 90 #include <sys/lock.h> 91 #include <sys/malloc.h> 92 #include <sys/mbuf.h> 93 #include <sys/module.h> 94 #include <sys/mutex.h> 95 #include <sys/priv.h> 96 #include <sys/proc.h> 97 #include <sys/protosw.h> 98 #include <sys/random.h> 99 #include <sys/systm.h> 100 #include <sys/socket.h> /* for net/if.h */ 101 #include <sys/sockio.h> 102 #include <sys/syslog.h> 103 #include <sys/sysctl.h> 104 #include <sys/time.h> 105 106 #include <vm/uma.h> 107 108 #include <net/bpf.h> 109 #include <net/if.h> 110 #include <net/if_clone.h> 111 #include <net/if_dl.h> 112 #include <net/if_types.h> 113 #include <net/if_var.h> 114 #include <net/if_private.h> 115 #include <net/pfil.h> 116 #include <net/vnet.h> 117 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/in_var.h> 121 #include <netinet/ip.h> 122 #include <netinet/ip_var.h> 123 #ifdef INET6 124 #include <netinet/ip6.h> 125 #include <netinet6/ip6_var.h> 126 #include <netinet6/in6_ifattach.h> 127 #endif 128 #if defined(INET) || defined(INET6) 129 #include <netinet/ip_carp.h> 130 #endif 131 #include <machine/in_cksum.h> 132 #include <netinet/if_ether.h> 133 #include <net/bridgestp.h> 134 #include <net/if_bridgevar.h> 135 #include <net/if_llc.h> 136 #include <net/if_vlan_var.h> 137 138 #include <net/route.h> 139 140 /* 141 * At various points in the code we need to know if we're hooked into the INET 142 * and/or INET6 pfil. Define some macros to do that based on which IP versions 143 * are enabled in the kernel. This avoids littering the rest of the code with 144 * #ifnet INET6 to avoid referencing V_inet6_pfil_head. 145 */ 146 #ifdef INET6 147 #define PFIL_HOOKED_IN_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 148 #define PFIL_HOOKED_OUT_INET6 PFIL_HOOKED_OUT(V_inet6_pfil_head) 149 #else 150 #define PFIL_HOOKED_IN_INET6 false 151 #define PFIL_HOOKED_OUT_INET6 false 152 #endif 153 154 #ifdef INET 155 #define PFIL_HOOKED_IN_INET PFIL_HOOKED_IN(V_inet_pfil_head) 156 #define PFIL_HOOKED_OUT_INET PFIL_HOOKED_OUT(V_inet_pfil_head) 157 #else 158 #define PFIL_HOOKED_IN_INET false 159 #define PFIL_HOOKED_OUT_INET false 160 #endif 161 162 #define PFIL_HOOKED_IN_46 (PFIL_HOOKED_IN_INET6 || PFIL_HOOKED_IN_INET) 163 #define PFIL_HOOKED_OUT_46 (PFIL_HOOKED_OUT_INET6 || PFIL_HOOKED_OUT_INET) 164 165 /* 166 * Size of the route hash table. Must be a power of two. 167 */ 168 #ifndef BRIDGE_RTHASH_SIZE 169 #define BRIDGE_RTHASH_SIZE 1024 170 #endif 171 172 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 173 174 /* 175 * Default maximum number of addresses to cache. 176 */ 177 #ifndef BRIDGE_RTABLE_MAX 178 #define BRIDGE_RTABLE_MAX 2000 179 #endif 180 181 /* 182 * Timeout (in seconds) for entries learned dynamically. 183 */ 184 #ifndef BRIDGE_RTABLE_TIMEOUT 185 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 186 #endif 187 188 /* 189 * Number of seconds between walks of the route list. 190 */ 191 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 192 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 193 #endif 194 195 /* 196 * List of capabilities to possibly mask on the member interface. 197 */ 198 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 199 IFCAP_TXCSUM_IPV6|IFCAP_MEXTPG) 200 201 /* 202 * List of capabilities to strip 203 */ 204 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 205 206 /* 207 * Bridge locking 208 * 209 * The bridge relies heavily on the epoch(9) system to protect its data 210 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 211 * must ensure there is only one writer at a time. 212 * 213 * That is: for read accesses we only need to be in NET_EPOCH, but for write 214 * accesses we must hold: 215 * 216 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 217 * - BRIDGE_LOCK, for any other change 218 * 219 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 220 * calls to bridge member interfaces and these ioctl()s can sleep. 221 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 222 * required while we're in NET_EPOCH and then we're not allowed to sleep. 223 */ 224 #define BRIDGE_LOCK_INIT(_sc) do { \ 225 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 226 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 227 } while (0) 228 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 229 sx_destroy(&(_sc)->sc_sx); \ 230 mtx_destroy(&(_sc)->sc_rt_mtx); \ 231 } while (0) 232 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 233 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 234 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 235 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 236 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 237 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 238 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 239 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 240 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 241 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 242 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 243 244 struct bridge_softc; 245 246 /* 247 * Bridge interface list entry. 248 */ 249 struct bridge_iflist { 250 CK_LIST_ENTRY(bridge_iflist) bif_next; 251 struct ifnet *bif_ifp; /* member if */ 252 struct bridge_softc *bif_sc; /* parent bridge */ 253 struct bstp_port bif_stp; /* STP state */ 254 uint32_t bif_flags; /* member if flags */ 255 int bif_savedcaps; /* saved capabilities */ 256 uint32_t bif_addrmax; /* max # of addresses */ 257 uint32_t bif_addrcnt; /* cur. # of addresses */ 258 uint32_t bif_addrexceeded;/* # of address violations */ 259 struct epoch_context bif_epoch_ctx; 260 ether_vlanid_t bif_pvid; /* port vlan id */ 261 ifbvlan_set_t bif_vlan_set; /* if allowed tagged vlans */ 262 uint16_t bif_vlanproto; /* vlan protocol */ 263 }; 264 265 /* 266 * Bridge route node. 267 */ 268 struct bridge_rtnode { 269 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 270 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 271 struct bridge_iflist *brt_dst; /* destination if */ 272 unsigned long brt_expire; /* expiration time */ 273 uint8_t brt_flags; /* address flags */ 274 uint8_t brt_addr[ETHER_ADDR_LEN]; 275 ether_vlanid_t brt_vlan; /* vlan id */ 276 struct vnet *brt_vnet; 277 struct epoch_context brt_epoch_ctx; 278 }; 279 #define brt_ifp brt_dst->bif_ifp 280 281 /* 282 * Software state for each bridge. 283 */ 284 struct bridge_softc { 285 struct ifnet *sc_ifp; /* make this an interface */ 286 LIST_ENTRY(bridge_softc) sc_list; 287 struct sx sc_sx; 288 struct mtx sc_rt_mtx; 289 uint32_t sc_brtmax; /* max # of addresses */ 290 uint32_t sc_brtcnt; /* cur. # of addresses */ 291 uint32_t sc_brttimeout; /* rt timeout in seconds */ 292 struct callout sc_brcallout; /* bridge callout */ 293 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 294 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 295 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 296 uint32_t sc_rthash_key; /* key for hash */ 297 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 298 struct bstp_state sc_stp; /* STP state */ 299 uint32_t sc_brtexceeded; /* # of cache drops */ 300 struct ifnet *sc_ifaddr; /* member mac copied from */ 301 struct ether_addr sc_defaddr; /* Default MAC address */ 302 if_input_fn_t sc_if_input; /* Saved copy of if_input */ 303 struct epoch_context sc_epoch_ctx; 304 ifbr_flags_t sc_flags; /* bridge flags */ 305 ether_vlanid_t sc_defpvid; /* default PVID */ 306 }; 307 308 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 309 #define V_bridge_list_sx VNET(bridge_list_sx) 310 static eventhandler_tag bridge_detach_cookie; 311 312 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 313 314 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 315 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 316 317 static int bridge_clone_create(struct if_clone *, char *, size_t, 318 struct ifc_data *, struct ifnet **); 319 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 320 321 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 322 static void bridge_mutecaps(struct bridge_softc *); 323 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 324 int); 325 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 326 static void bridge_init(void *); 327 static void bridge_dummynet(struct mbuf *, struct ifnet *); 328 static bool bridge_same(const void *, const void *); 329 static void *bridge_get_softc(struct ifnet *); 330 static void bridge_stop(struct ifnet *, int); 331 static int bridge_transmit(struct ifnet *, struct mbuf *); 332 #ifdef ALTQ 333 static void bridge_altq_start(if_t); 334 static int bridge_altq_transmit(if_t, struct mbuf *); 335 #endif 336 static void bridge_qflush(struct ifnet *); 337 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 338 static void bridge_inject(struct ifnet *, struct mbuf *); 339 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 340 struct rtentry *); 341 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 342 struct mbuf *, struct bridge_iflist *); 343 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 344 345 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 346 struct mbuf *m); 347 static bool bridge_member_ifaddrs(void); 348 static void bridge_timer(void *); 349 350 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 351 struct mbuf *, int); 352 static void bridge_span(struct bridge_softc *, struct mbuf *); 353 354 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 355 ether_vlanid_t, struct bridge_iflist *, int, uint8_t); 356 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 357 ether_vlanid_t); 358 static void bridge_rttrim(struct bridge_softc *); 359 static void bridge_rtage(struct bridge_softc *); 360 static void bridge_rtflush(struct bridge_softc *, int); 361 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 362 ether_vlanid_t); 363 static bool bridge_vfilter_in(const struct bridge_iflist *, struct mbuf *); 364 static bool bridge_vfilter_out(const struct bridge_iflist *, 365 const struct mbuf *); 366 367 static void bridge_rtable_init(struct bridge_softc *); 368 static void bridge_rtable_fini(struct bridge_softc *); 369 370 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 371 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 372 const uint8_t *, ether_vlanid_t); 373 static int bridge_rtnode_insert(struct bridge_softc *, 374 struct bridge_rtnode *); 375 static void bridge_rtnode_destroy(struct bridge_softc *, 376 struct bridge_rtnode *); 377 static void bridge_rtable_expire(struct ifnet *, int); 378 static void bridge_state_change(struct ifnet *, int); 379 380 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 381 const char *name); 382 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 383 struct ifnet *ifp); 384 static void bridge_delete_member(struct bridge_softc *, 385 struct bridge_iflist *, int); 386 static void bridge_delete_span(struct bridge_softc *, 387 struct bridge_iflist *); 388 389 static int bridge_ioctl_add(struct bridge_softc *, void *); 390 static int bridge_ioctl_del(struct bridge_softc *, void *); 391 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 392 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 393 static int bridge_ioctl_scache(struct bridge_softc *, void *); 394 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 395 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 396 static int bridge_ioctl_rts(struct bridge_softc *, void *); 397 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 398 static int bridge_ioctl_sto(struct bridge_softc *, void *); 399 static int bridge_ioctl_gto(struct bridge_softc *, void *); 400 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 401 static int bridge_ioctl_flush(struct bridge_softc *, void *); 402 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 403 static int bridge_ioctl_spri(struct bridge_softc *, void *); 404 static int bridge_ioctl_ght(struct bridge_softc *, void *); 405 static int bridge_ioctl_sht(struct bridge_softc *, void *); 406 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 407 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 408 static int bridge_ioctl_gma(struct bridge_softc *, void *); 409 static int bridge_ioctl_sma(struct bridge_softc *, void *); 410 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 411 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 412 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 413 static int bridge_ioctl_sifpvid(struct bridge_softc *, void *); 414 static int bridge_ioctl_sifvlanset(struct bridge_softc *, void *); 415 static int bridge_ioctl_gifvlanset(struct bridge_softc *, void *); 416 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 417 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 418 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 419 static int bridge_ioctl_grte(struct bridge_softc *, void *); 420 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 421 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 422 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 423 static int bridge_ioctl_gflags(struct bridge_softc *, void *); 424 static int bridge_ioctl_sflags(struct bridge_softc *, void *); 425 static int bridge_ioctl_gdefpvid(struct bridge_softc *, void *); 426 static int bridge_ioctl_sdefpvid(struct bridge_softc *, void *); 427 static int bridge_ioctl_svlanproto(struct bridge_softc *, void *); 428 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 429 int); 430 #ifdef INET 431 static int bridge_ip_checkbasic(struct mbuf **mp); 432 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 433 struct ether_header *, int, struct llc *); 434 #endif /* INET */ 435 #ifdef INET6 436 static int bridge_ip6_checkbasic(struct mbuf **mp); 437 #endif /* INET6 */ 438 static void bridge_linkstate(struct ifnet *ifp); 439 static void bridge_linkcheck(struct bridge_softc *sc); 440 441 /* 442 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2 443 * to indicate untagged frames. 444 */ 445 #define VLANTAGOF(_m) \ 446 ((_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL) 447 448 static struct bstp_cb_ops bridge_ops = { 449 .bcb_state = bridge_state_change, 450 .bcb_rtage = bridge_rtable_expire 451 }; 452 453 SYSCTL_DECL(_net_link); 454 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 455 "Bridge"); 456 457 /* only pass IP[46] packets when pfil is enabled */ 458 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 459 #define V_pfil_onlyip VNET(pfil_onlyip) 460 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 461 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 462 "Only pass IP packets when pfil is enabled"); 463 464 /* run pfil hooks on the bridge interface */ 465 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 466 #define V_pfil_bridge VNET(pfil_bridge) 467 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 468 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 469 "Packet filter on the bridge interface"); 470 471 /* layer2 filter with ipfw */ 472 VNET_DEFINE_STATIC(int, pfil_ipfw); 473 #define V_pfil_ipfw VNET(pfil_ipfw) 474 475 /* layer2 ARP filter with ipfw */ 476 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 477 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 478 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 479 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 480 "Filter ARP packets through IPFW layer2"); 481 482 /* run pfil hooks on the member interface */ 483 VNET_DEFINE_STATIC(int, pfil_member) = 0; 484 #define V_pfil_member VNET(pfil_member) 485 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 486 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 487 "Packet filter on the member interface"); 488 489 /* run pfil hooks on the physical interface for locally destined packets */ 490 VNET_DEFINE_STATIC(int, pfil_local_phys); 491 #define V_pfil_local_phys VNET(pfil_local_phys) 492 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 493 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 494 "Packet filter on the physical interface for locally destined packets"); 495 496 /* log STP state changes */ 497 VNET_DEFINE_STATIC(int, log_stp); 498 #define V_log_stp VNET(log_stp) 499 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 500 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 501 "Log STP state changes"); 502 503 /* share MAC with first bridge member */ 504 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 505 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 506 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 507 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 508 "Inherit MAC address from the first bridge member"); 509 510 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 511 #define V_allow_llz_overlap VNET(allow_llz_overlap) 512 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 513 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 514 "Allow overlap of link-local scope " 515 "zones of a bridge interface and the member interfaces"); 516 517 /* log MAC address port flapping */ 518 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 519 #define V_log_mac_flap VNET(log_mac_flap) 520 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 521 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 522 "Log MAC address port flapping"); 523 524 /* allow IP addresses on bridge members */ 525 VNET_DEFINE_STATIC(bool, member_ifaddrs) = true; 526 #define V_member_ifaddrs VNET(member_ifaddrs) 527 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, member_ifaddrs, 528 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(member_ifaddrs), false, 529 "Allow layer 3 addresses on bridge members (deprecated)"); 530 531 static bool 532 bridge_member_ifaddrs(void) 533 { 534 return (V_member_ifaddrs); 535 } 536 537 VNET_DEFINE_STATIC(int, log_interval) = 5; 538 VNET_DEFINE_STATIC(int, log_count) = 0; 539 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 540 541 #define V_log_interval VNET(log_interval) 542 #define V_log_count VNET(log_count) 543 #define V_log_last VNET(log_last) 544 545 struct bridge_control { 546 int (*bc_func)(struct bridge_softc *, void *); 547 int bc_argsize; 548 int bc_flags; 549 }; 550 551 #define BC_F_COPYIN 0x01 /* copy arguments in */ 552 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 553 #define BC_F_SUSER 0x04 /* do super-user check */ 554 555 static const struct bridge_control bridge_control_table[] = { 556 { bridge_ioctl_add, sizeof(struct ifbreq), 557 BC_F_COPYIN|BC_F_SUSER }, 558 { bridge_ioctl_del, sizeof(struct ifbreq), 559 BC_F_COPYIN|BC_F_SUSER }, 560 561 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 562 BC_F_COPYIN|BC_F_COPYOUT }, 563 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 564 BC_F_COPYIN|BC_F_SUSER }, 565 566 { bridge_ioctl_scache, sizeof(struct ifbrparam), 567 BC_F_COPYIN|BC_F_SUSER }, 568 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 569 BC_F_COPYOUT }, 570 571 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 572 BC_F_COPYIN|BC_F_COPYOUT }, 573 { bridge_ioctl_rts, sizeof(struct ifbaconf), 574 BC_F_COPYIN|BC_F_COPYOUT }, 575 576 { bridge_ioctl_saddr, sizeof(struct ifbareq), 577 BC_F_COPYIN|BC_F_SUSER }, 578 579 { bridge_ioctl_sto, sizeof(struct ifbrparam), 580 BC_F_COPYIN|BC_F_SUSER }, 581 { bridge_ioctl_gto, sizeof(struct ifbrparam), 582 BC_F_COPYOUT }, 583 584 { bridge_ioctl_daddr, sizeof(struct ifbareq), 585 BC_F_COPYIN|BC_F_SUSER }, 586 587 { bridge_ioctl_flush, sizeof(struct ifbreq), 588 BC_F_COPYIN|BC_F_SUSER }, 589 590 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 591 BC_F_COPYOUT }, 592 { bridge_ioctl_spri, sizeof(struct ifbrparam), 593 BC_F_COPYIN|BC_F_SUSER }, 594 595 { bridge_ioctl_ght, sizeof(struct ifbrparam), 596 BC_F_COPYOUT }, 597 { bridge_ioctl_sht, sizeof(struct ifbrparam), 598 BC_F_COPYIN|BC_F_SUSER }, 599 600 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 601 BC_F_COPYOUT }, 602 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 603 BC_F_COPYIN|BC_F_SUSER }, 604 605 { bridge_ioctl_gma, sizeof(struct ifbrparam), 606 BC_F_COPYOUT }, 607 { bridge_ioctl_sma, sizeof(struct ifbrparam), 608 BC_F_COPYIN|BC_F_SUSER }, 609 610 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 611 BC_F_COPYIN|BC_F_SUSER }, 612 613 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 614 BC_F_COPYIN|BC_F_SUSER }, 615 616 { bridge_ioctl_addspan, sizeof(struct ifbreq), 617 BC_F_COPYIN|BC_F_SUSER }, 618 { bridge_ioctl_delspan, sizeof(struct ifbreq), 619 BC_F_COPYIN|BC_F_SUSER }, 620 621 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 622 BC_F_COPYOUT }, 623 624 { bridge_ioctl_grte, sizeof(struct ifbrparam), 625 BC_F_COPYOUT }, 626 627 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 628 BC_F_COPYIN|BC_F_COPYOUT }, 629 630 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 631 BC_F_COPYIN|BC_F_SUSER }, 632 633 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 634 BC_F_COPYIN|BC_F_SUSER }, 635 636 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 637 BC_F_COPYIN|BC_F_SUSER }, 638 639 { bridge_ioctl_sifpvid, sizeof(struct ifbreq), 640 BC_F_COPYIN|BC_F_SUSER }, 641 642 { bridge_ioctl_sifvlanset, sizeof(struct ifbif_vlan_req), 643 BC_F_COPYIN|BC_F_SUSER }, 644 645 { bridge_ioctl_gifvlanset, sizeof(struct ifbif_vlan_req), 646 BC_F_COPYIN|BC_F_COPYOUT }, 647 648 { bridge_ioctl_gflags, sizeof(struct ifbrparam), 649 BC_F_COPYOUT }, 650 651 { bridge_ioctl_sflags, sizeof(struct ifbrparam), 652 BC_F_COPYIN|BC_F_SUSER }, 653 654 { bridge_ioctl_gdefpvid, sizeof(struct ifbrparam), 655 BC_F_COPYOUT }, 656 657 { bridge_ioctl_sdefpvid, sizeof(struct ifbrparam), 658 BC_F_COPYIN|BC_F_SUSER }, 659 660 { bridge_ioctl_svlanproto, sizeof(struct ifbreq), 661 BC_F_COPYIN|BC_F_SUSER }, 662 }; 663 static const int bridge_control_table_size = nitems(bridge_control_table); 664 665 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list) = 666 LIST_HEAD_INITIALIZER(); 667 #define V_bridge_list VNET(bridge_list) 668 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 669 "if_bridge list") 670 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 671 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 672 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 673 674 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 675 #define V_bridge_cloner VNET(bridge_cloner) 676 677 static const char bridge_name[] = "bridge"; 678 679 static void 680 vnet_bridge_init(const void *unused __unused) 681 { 682 683 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 684 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 685 UMA_ALIGN_PTR, 0); 686 BRIDGE_LIST_LOCK_INIT(); 687 688 struct if_clone_addreq req = { 689 .create_f = bridge_clone_create, 690 .destroy_f = bridge_clone_destroy, 691 .flags = IFC_F_AUTOUNIT, 692 }; 693 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 694 } 695 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 696 vnet_bridge_init, NULL); 697 698 static void 699 vnet_bridge_uninit(const void *unused __unused) 700 { 701 702 ifc_detach_cloner(V_bridge_cloner); 703 V_bridge_cloner = NULL; 704 BRIDGE_LIST_LOCK_DESTROY(); 705 706 /* Callbacks may use the UMA zone. */ 707 NET_EPOCH_DRAIN_CALLBACKS(); 708 709 uma_zdestroy(V_bridge_rtnode_zone); 710 } 711 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 712 vnet_bridge_uninit, NULL); 713 714 static int 715 bridge_modevent(module_t mod, int type, void *data) 716 { 717 718 switch (type) { 719 case MOD_LOAD: 720 bridge_dn_p = bridge_dummynet; 721 bridge_same_p = bridge_same; 722 bridge_get_softc_p = bridge_get_softc; 723 bridge_member_ifaddrs_p = bridge_member_ifaddrs; 724 bridge_detach_cookie = EVENTHANDLER_REGISTER( 725 ifnet_departure_event, bridge_ifdetach, NULL, 726 EVENTHANDLER_PRI_ANY); 727 break; 728 case MOD_UNLOAD: 729 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 730 bridge_detach_cookie); 731 bridge_dn_p = NULL; 732 bridge_same_p = NULL; 733 bridge_get_softc_p = NULL; 734 bridge_member_ifaddrs_p = NULL; 735 break; 736 default: 737 return (EOPNOTSUPP); 738 } 739 return (0); 740 } 741 742 static moduledata_t bridge_mod = { 743 "if_bridge", 744 bridge_modevent, 745 0 746 }; 747 748 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 749 MODULE_VERSION(if_bridge, 1); 750 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 751 752 /* 753 * handler for net.link.bridge.ipfw 754 */ 755 static int 756 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 757 { 758 int enable = V_pfil_ipfw; 759 int error; 760 761 error = sysctl_handle_int(oidp, &enable, 0, req); 762 enable &= 1; 763 764 if (enable != V_pfil_ipfw) { 765 V_pfil_ipfw = enable; 766 767 /* 768 * Disable pfil so that ipfw doesnt run twice, if the user 769 * really wants both then they can re-enable pfil_bridge and/or 770 * pfil_member. Also allow non-ip packets as ipfw can filter by 771 * layer2 type. 772 */ 773 if (V_pfil_ipfw) { 774 V_pfil_onlyip = 0; 775 V_pfil_bridge = 0; 776 V_pfil_member = 0; 777 } 778 } 779 780 return (error); 781 } 782 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 783 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 784 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 785 "Layer2 filter with IPFW"); 786 787 #ifdef VIMAGE 788 static void 789 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 790 { 791 struct bridge_softc *sc = ifp->if_softc; 792 struct bridge_iflist *bif; 793 794 BRIDGE_LOCK(sc); 795 796 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 797 bridge_delete_member(sc, bif, 0); 798 799 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 800 bridge_delete_span(sc, bif); 801 } 802 803 BRIDGE_UNLOCK(sc); 804 } 805 #endif 806 807 /* 808 * bridge_get_softc: 809 * 810 * Return the bridge softc for an ifnet. 811 */ 812 static void * 813 bridge_get_softc(struct ifnet *ifp) 814 { 815 struct bridge_iflist *bif; 816 817 NET_EPOCH_ASSERT(); 818 819 bif = ifp->if_bridge; 820 if (bif == NULL) 821 return (NULL); 822 return (bif->bif_sc); 823 } 824 825 /* 826 * bridge_same: 827 * 828 * Return true if two interfaces are in the same bridge. This is only used by 829 * bridgestp via bridge_same_p. 830 */ 831 static bool 832 bridge_same(const void *bifap, const void *bifbp) 833 { 834 const struct bridge_iflist *bifa = bifap, *bifb = bifbp; 835 836 NET_EPOCH_ASSERT(); 837 838 if (bifa == NULL || bifb == NULL) 839 return (false); 840 841 return (bifa->bif_sc == bifb->bif_sc); 842 } 843 844 /* 845 * bridge_clone_create: 846 * 847 * Create a new bridge instance. 848 */ 849 static int 850 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 851 struct ifc_data *ifd, struct ifnet **ifpp) 852 { 853 struct bridge_softc *sc; 854 struct ifnet *ifp; 855 856 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 857 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 858 859 BRIDGE_LOCK_INIT(sc); 860 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 861 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 862 863 /* Initialize our routing table. */ 864 bridge_rtable_init(sc); 865 866 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 867 868 CK_LIST_INIT(&sc->sc_iflist); 869 CK_LIST_INIT(&sc->sc_spanlist); 870 871 ifp->if_softc = sc; 872 if_initname(ifp, bridge_name, ifd->unit); 873 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 874 ifp->if_capabilities = ifp->if_capenable = IFCAP_VLAN_HWTAGGING; 875 ifp->if_ioctl = bridge_ioctl; 876 #ifdef ALTQ 877 ifp->if_start = bridge_altq_start; 878 ifp->if_transmit = bridge_altq_transmit; 879 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 880 ifp->if_snd.ifq_drv_maxlen = 0; 881 IFQ_SET_READY(&ifp->if_snd); 882 #else 883 ifp->if_transmit = bridge_transmit; 884 #endif 885 ifp->if_qflush = bridge_qflush; 886 ifp->if_init = bridge_init; 887 ifp->if_type = IFT_BRIDGE; 888 889 ether_gen_addr(ifp, &sc->sc_defaddr); 890 891 bstp_attach(&sc->sc_stp, &bridge_ops); 892 ether_ifattach(ifp, sc->sc_defaddr.octet); 893 /* Now undo some of the damage... */ 894 ifp->if_baudrate = 0; 895 #ifdef VIMAGE 896 ifp->if_reassign = bridge_reassign; 897 #endif 898 sc->sc_if_input = ifp->if_input; /* ether_input */ 899 ifp->if_input = bridge_inject; 900 901 /* 902 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge 903 * itself via bridge_inject(). This is required for netmap but 904 * otherwise has no effect. 905 */ 906 ifp->if_bridge_input = bridge_input; 907 908 BRIDGE_LIST_LOCK(); 909 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 910 BRIDGE_LIST_UNLOCK(); 911 *ifpp = ifp; 912 913 return (0); 914 } 915 916 static void 917 bridge_clone_destroy_cb(struct epoch_context *ctx) 918 { 919 struct bridge_softc *sc; 920 921 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 922 923 BRIDGE_LOCK_DESTROY(sc); 924 free(sc, M_DEVBUF); 925 } 926 927 /* 928 * bridge_clone_destroy: 929 * 930 * Destroy a bridge instance. 931 */ 932 static int 933 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 934 { 935 struct bridge_softc *sc = ifp->if_softc; 936 struct bridge_iflist *bif; 937 struct epoch_tracker et; 938 939 BRIDGE_LOCK(sc); 940 941 bridge_stop(ifp, 1); 942 ifp->if_flags &= ~IFF_UP; 943 944 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 945 bridge_delete_member(sc, bif, 0); 946 947 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 948 bridge_delete_span(sc, bif); 949 } 950 951 /* Tear down the routing table. */ 952 bridge_rtable_fini(sc); 953 954 BRIDGE_UNLOCK(sc); 955 956 NET_EPOCH_ENTER(et); 957 958 callout_drain(&sc->sc_brcallout); 959 960 BRIDGE_LIST_LOCK(); 961 LIST_REMOVE(sc, sc_list); 962 BRIDGE_LIST_UNLOCK(); 963 964 bstp_detach(&sc->sc_stp); 965 #ifdef ALTQ 966 IFQ_PURGE(&ifp->if_snd); 967 #endif 968 NET_EPOCH_EXIT(et); 969 970 ether_ifdetach(ifp); 971 if_free(ifp); 972 973 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 974 975 return (0); 976 } 977 978 /* 979 * bridge_ioctl: 980 * 981 * Handle a control request from the operator. 982 */ 983 static int 984 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 985 { 986 struct bridge_softc *sc = ifp->if_softc; 987 struct ifreq *ifr = (struct ifreq *)data; 988 struct bridge_iflist *bif; 989 struct thread *td = curthread; 990 union { 991 struct ifbreq ifbreq; 992 struct ifbifconf ifbifconf; 993 struct ifbareq ifbareq; 994 struct ifbaconf ifbaconf; 995 struct ifbrparam ifbrparam; 996 struct ifbropreq ifbropreq; 997 struct ifbif_vlan_req ifvlanreq; 998 } args; 999 struct ifdrv *ifd = (struct ifdrv *) data; 1000 const struct bridge_control *bc; 1001 int error = 0, oldmtu; 1002 1003 BRIDGE_LOCK(sc); 1004 1005 switch (cmd) { 1006 case SIOCADDMULTI: 1007 case SIOCDELMULTI: 1008 break; 1009 1010 case SIOCGDRVSPEC: 1011 case SIOCSDRVSPEC: 1012 if (ifd->ifd_cmd >= bridge_control_table_size) { 1013 error = EXTERROR(EINVAL, "Invalid control command"); 1014 break; 1015 } 1016 bc = &bridge_control_table[ifd->ifd_cmd]; 1017 1018 if (cmd == SIOCGDRVSPEC && 1019 (bc->bc_flags & BC_F_COPYOUT) == 0) { 1020 error = EXTERROR(EINVAL, 1021 "Inappropriate ioctl for command " 1022 "(expected SIOCSDRVSPEC)"); 1023 break; 1024 } 1025 else if (cmd == SIOCSDRVSPEC && 1026 (bc->bc_flags & BC_F_COPYOUT) != 0) { 1027 error = EXTERROR(EINVAL, 1028 "Inappropriate ioctl for command " 1029 "(expected SIOCGDRVSPEC)"); 1030 break; 1031 } 1032 1033 if (bc->bc_flags & BC_F_SUSER) { 1034 error = priv_check(td, PRIV_NET_BRIDGE); 1035 if (error) { 1036 EXTERROR(error, "PRIV_NET_BRIDGE required"); 1037 break; 1038 } 1039 } 1040 1041 if (ifd->ifd_len != bc->bc_argsize || 1042 ifd->ifd_len > sizeof(args)) { 1043 error = EXTERROR(EINVAL, "Invalid argument size"); 1044 break; 1045 } 1046 1047 bzero(&args, sizeof(args)); 1048 if (bc->bc_flags & BC_F_COPYIN) { 1049 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 1050 if (error) 1051 break; 1052 } 1053 1054 oldmtu = ifp->if_mtu; 1055 error = (*bc->bc_func)(sc, &args); 1056 if (error) 1057 break; 1058 1059 /* 1060 * Bridge MTU may change during addition of the first port. 1061 * If it did, do network layer specific procedure. 1062 */ 1063 if (ifp->if_mtu != oldmtu) 1064 if_notifymtu(ifp); 1065 1066 if (bc->bc_flags & BC_F_COPYOUT) 1067 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 1068 1069 break; 1070 1071 case SIOCSIFFLAGS: 1072 if (!(ifp->if_flags & IFF_UP) && 1073 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 1074 /* 1075 * If interface is marked down and it is running, 1076 * then stop and disable it. 1077 */ 1078 bridge_stop(ifp, 1); 1079 } else if ((ifp->if_flags & IFF_UP) && 1080 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 1081 /* 1082 * If interface is marked up and it is stopped, then 1083 * start it. 1084 */ 1085 BRIDGE_UNLOCK(sc); 1086 (*ifp->if_init)(sc); 1087 BRIDGE_LOCK(sc); 1088 } 1089 break; 1090 1091 case SIOCSIFMTU: 1092 oldmtu = sc->sc_ifp->if_mtu; 1093 1094 if (ifr->ifr_mtu < IF_MINMTU) { 1095 error = EXTERROR(EINVAL, 1096 "Requested MTU is lower than IF_MINMTU"); 1097 break; 1098 } 1099 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1100 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 1101 break; 1102 } 1103 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1104 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 1105 SIOCSIFMTU, (caddr_t)ifr); 1106 if (error != 0) { 1107 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1108 " member %s\n", sc->sc_ifp->if_xname, 1109 ifr->ifr_mtu, 1110 bif->bif_ifp->if_xname); 1111 error = EINVAL; 1112 break; 1113 } 1114 } 1115 if (error) { 1116 /* Restore the previous MTU on all member interfaces. */ 1117 ifr->ifr_mtu = oldmtu; 1118 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1119 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 1120 SIOCSIFMTU, (caddr_t)ifr); 1121 } 1122 EXTERROR(error, 1123 "Failed to set MTU on member interface"); 1124 } else { 1125 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 1126 } 1127 break; 1128 default: 1129 /* 1130 * drop the lock as ether_ioctl() will call bridge_start() and 1131 * cause the lock to be recursed. 1132 */ 1133 BRIDGE_UNLOCK(sc); 1134 error = ether_ioctl(ifp, cmd, data); 1135 BRIDGE_LOCK(sc); 1136 break; 1137 } 1138 1139 BRIDGE_UNLOCK(sc); 1140 1141 return (error); 1142 } 1143 1144 /* 1145 * bridge_mutecaps: 1146 * 1147 * Clear or restore unwanted capabilities on the member interface 1148 */ 1149 static void 1150 bridge_mutecaps(struct bridge_softc *sc) 1151 { 1152 struct bridge_iflist *bif; 1153 int enabled, mask; 1154 1155 BRIDGE_LOCK_ASSERT(sc); 1156 1157 /* Initial bitmask of capabilities to test */ 1158 mask = BRIDGE_IFCAPS_MASK; 1159 1160 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1161 /* Every member must support it or it's disabled */ 1162 mask &= bif->bif_savedcaps; 1163 } 1164 1165 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1166 enabled = bif->bif_ifp->if_capenable; 1167 enabled &= ~BRIDGE_IFCAPS_STRIP; 1168 /* Strip off mask bits and enable them again if allowed */ 1169 enabled &= ~BRIDGE_IFCAPS_MASK; 1170 enabled |= mask; 1171 bridge_set_ifcap(sc, bif, enabled); 1172 } 1173 } 1174 1175 static void 1176 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1177 { 1178 struct ifnet *ifp = bif->bif_ifp; 1179 struct ifreq ifr; 1180 int error, mask, stuck; 1181 1182 bzero(&ifr, sizeof(ifr)); 1183 ifr.ifr_reqcap = set; 1184 1185 if (ifp->if_capenable != set) { 1186 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1187 if (error) 1188 if_printf(sc->sc_ifp, 1189 "error setting capabilities on %s: %d\n", 1190 ifp->if_xname, error); 1191 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1192 stuck = ifp->if_capenable & mask & ~set; 1193 if (stuck != 0) 1194 if_printf(sc->sc_ifp, 1195 "can't disable some capabilities on %s: 0x%x\n", 1196 ifp->if_xname, stuck); 1197 } 1198 } 1199 1200 /* 1201 * bridge_lookup_member: 1202 * 1203 * Lookup a bridge member interface. 1204 */ 1205 static struct bridge_iflist * 1206 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1207 { 1208 struct bridge_iflist *bif; 1209 struct ifnet *ifp; 1210 1211 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1212 1213 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1214 ifp = bif->bif_ifp; 1215 if (strcmp(ifp->if_xname, name) == 0) 1216 return (bif); 1217 } 1218 1219 return (NULL); 1220 } 1221 1222 /* 1223 * bridge_lookup_member_if: 1224 * 1225 * Lookup a bridge member interface by ifnet*. 1226 */ 1227 static struct bridge_iflist * 1228 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1229 { 1230 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1231 return (member_ifp->if_bridge); 1232 } 1233 1234 static void 1235 bridge_delete_member_cb(struct epoch_context *ctx) 1236 { 1237 struct bridge_iflist *bif; 1238 1239 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1240 1241 free(bif, M_DEVBUF); 1242 } 1243 1244 /* 1245 * bridge_delete_member: 1246 * 1247 * Delete the specified member interface. 1248 */ 1249 static void 1250 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1251 int gone) 1252 { 1253 struct ifnet *ifs = bif->bif_ifp; 1254 struct ifnet *fif = NULL; 1255 struct bridge_iflist *bifl; 1256 1257 BRIDGE_LOCK_ASSERT(sc); 1258 1259 if (bif->bif_flags & IFBIF_STP) 1260 bstp_disable(&bif->bif_stp); 1261 1262 ifs->if_bridge = NULL; 1263 CK_LIST_REMOVE(bif, bif_next); 1264 1265 /* 1266 * If removing the interface that gave the bridge its mac address, set 1267 * the mac address of the bridge to the address of the next member, or 1268 * to its default address if no members are left. 1269 */ 1270 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1271 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1272 bcopy(&sc->sc_defaddr, 1273 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1274 sc->sc_ifaddr = NULL; 1275 } else { 1276 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1277 fif = bifl->bif_ifp; 1278 bcopy(IF_LLADDR(fif), 1279 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1280 sc->sc_ifaddr = fif; 1281 } 1282 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1283 } 1284 1285 bridge_linkcheck(sc); 1286 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1287 BRIDGE_RT_LOCK(sc); 1288 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1289 BRIDGE_RT_UNLOCK(sc); 1290 KASSERT(bif->bif_addrcnt == 0, 1291 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1292 1293 ifs->if_bridge_output = NULL; 1294 ifs->if_bridge_input = NULL; 1295 ifs->if_bridge_linkstate = NULL; 1296 if (!gone) { 1297 switch (ifs->if_type) { 1298 case IFT_ETHER: 1299 case IFT_L2VLAN: 1300 /* 1301 * Take the interface out of promiscuous mode, but only 1302 * if it was promiscuous in the first place. It might 1303 * not be if we're in the bridge_ioctl_add() error path. 1304 */ 1305 if (ifs->if_flags & IFF_PROMISC) 1306 (void) ifpromisc(ifs, 0); 1307 break; 1308 1309 case IFT_GIF: 1310 break; 1311 1312 default: 1313 #ifdef DIAGNOSTIC 1314 panic("bridge_delete_member: impossible"); 1315 #endif 1316 break; 1317 } 1318 /* Re-enable any interface capabilities */ 1319 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1320 } 1321 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1322 1323 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1324 } 1325 1326 /* 1327 * bridge_delete_span: 1328 * 1329 * Delete the specified span interface. 1330 */ 1331 static void 1332 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1333 { 1334 BRIDGE_LOCK_ASSERT(sc); 1335 1336 KASSERT(bif->bif_ifp->if_bridge == NULL, 1337 ("%s: not a span interface", __func__)); 1338 1339 CK_LIST_REMOVE(bif, bif_next); 1340 1341 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1342 } 1343 1344 static int 1345 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1346 { 1347 struct ifbreq *req = arg; 1348 struct bridge_iflist *bif = NULL; 1349 struct ifnet *ifs; 1350 int error = 0; 1351 1352 ifs = ifunit(req->ifbr_ifsname); 1353 if (ifs == NULL) 1354 return (EXTERROR(ENOENT, "No such interface", 1355 req->ifbr_ifsname)); 1356 if (ifs->if_ioctl == NULL) /* must be supported */ 1357 return (EXTERROR(EINVAL, "Interface must support ioctl(2)")); 1358 1359 /* 1360 * If the new interface is a vlan(4), it could be a bridge SVI. 1361 * Don't allow such things to be added to bridges. 1362 */ 1363 if (ifs->if_type == IFT_L2VLAN) { 1364 struct ifnet *parent; 1365 struct epoch_tracker et; 1366 bool is_bridge; 1367 1368 /* 1369 * Entering NET_EPOCH with BRIDGE_LOCK held, but this is okay 1370 * since we don't sleep here. 1371 */ 1372 NET_EPOCH_ENTER(et); 1373 parent = VLAN_TRUNKDEV(ifs); 1374 is_bridge = (parent != NULL && parent->if_type == IFT_BRIDGE); 1375 NET_EPOCH_EXIT(et); 1376 1377 if (is_bridge) 1378 return (EXTERROR(EINVAL, 1379 "Bridge SVI cannot be added to a bridge")); 1380 } 1381 1382 /* If it's in the span list, it can't be a member. */ 1383 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1384 if (ifs == bif->bif_ifp) 1385 return (EXTERROR(EBUSY, 1386 "Span interface cannot be a member")); 1387 1388 if (ifs->if_bridge) { 1389 struct bridge_iflist *sbif = ifs->if_bridge; 1390 if (sbif->bif_sc == sc) 1391 return (EXTERROR(EEXIST, 1392 "Interface is already a member of this bridge")); 1393 1394 return (EXTERROR(EBUSY, 1395 "Interface is already a member of another bridge")); 1396 } 1397 1398 switch (ifs->if_type) { 1399 case IFT_ETHER: 1400 case IFT_L2VLAN: 1401 case IFT_GIF: 1402 /* permitted interface types */ 1403 break; 1404 default: 1405 return (EXTERROR(EINVAL, "Unsupported interface type")); 1406 } 1407 1408 #ifdef INET6 1409 /* 1410 * Two valid inet6 addresses with link-local scope must not be 1411 * on the parent interface and the member interfaces at the 1412 * same time. This restriction is needed to prevent violation 1413 * of link-local scope zone. Attempts to add a member 1414 * interface which has inet6 addresses when the parent has 1415 * inet6 triggers removal of all inet6 addresses on the member 1416 * interface. 1417 */ 1418 1419 /* Check if the parent interface has a link-local scope addr. */ 1420 if (V_allow_llz_overlap == 0 && 1421 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1422 /* 1423 * If any, remove all inet6 addresses from the member 1424 * interfaces. 1425 */ 1426 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1427 if (in6ifa_llaonifp(bif->bif_ifp)) { 1428 in6_ifdetach(bif->bif_ifp); 1429 if_printf(sc->sc_ifp, 1430 "IPv6 addresses on %s have been removed " 1431 "before adding it as a member to prevent " 1432 "IPv6 address scope violation.\n", 1433 bif->bif_ifp->if_xname); 1434 } 1435 } 1436 if (in6ifa_llaonifp(ifs)) { 1437 in6_ifdetach(ifs); 1438 if_printf(sc->sc_ifp, 1439 "IPv6 addresses on %s have been removed " 1440 "before adding it as a member to prevent " 1441 "IPv6 address scope violation.\n", 1442 ifs->if_xname); 1443 } 1444 } 1445 #endif 1446 1447 /* 1448 * If member_ifaddrs is disabled, do not allow an interface with 1449 * assigned IP addresses to be added to a bridge. Skip this check 1450 * for gif interfaces, because the IP address assigned to a gif 1451 * interface is separate from the bridge's Ethernet segment. 1452 */ 1453 if (ifs->if_type != IFT_GIF) { 1454 struct ifaddr *ifa; 1455 1456 CK_STAILQ_FOREACH(ifa, &ifs->if_addrhead, ifa_link) { 1457 if (ifa->ifa_addr->sa_family != AF_INET && 1458 ifa->ifa_addr->sa_family != AF_INET6) 1459 continue; 1460 1461 if (V_member_ifaddrs) { 1462 if_printf(sc->sc_ifp, 1463 "WARNING: Adding member interface %s which " 1464 "has an IP address assigned is deprecated " 1465 "and will be unsupported in a future " 1466 "release.\n", ifs->if_xname); 1467 break; 1468 } else { 1469 return (EXTERROR(EINVAL, 1470 "Member interface may not have " 1471 "an IP address assigned")); 1472 } 1473 } 1474 } 1475 1476 /* Allow the first Ethernet member to define the MTU */ 1477 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1478 sc->sc_ifp->if_mtu = ifs->if_mtu; 1479 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1480 struct ifreq ifr; 1481 1482 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1483 ifs->if_xname); 1484 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1485 1486 error = (*ifs->if_ioctl)(ifs, 1487 SIOCSIFMTU, (caddr_t)&ifr); 1488 if (error != 0) { 1489 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1490 " new member %s\n", sc->sc_ifp->if_xname, 1491 ifr.ifr_mtu, 1492 ifs->if_xname); 1493 return (EXTERROR(EINVAL, 1494 "Failed to set MTU on new member")); 1495 } 1496 } 1497 1498 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1499 if (bif == NULL) 1500 return (ENOMEM); 1501 1502 bif->bif_sc = sc; 1503 bif->bif_ifp = ifs; 1504 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1505 bif->bif_savedcaps = ifs->if_capenable; 1506 bif->bif_vlanproto = ETHERTYPE_VLAN; 1507 bif->bif_pvid = sc->sc_defpvid; 1508 if (sc->sc_flags & IFBRF_DEFQINQ) 1509 bif->bif_flags |= IFBIF_QINQ; 1510 1511 /* 1512 * Assign the interface's MAC address to the bridge if it's the first 1513 * member and the MAC address of the bridge has not been changed from 1514 * the default randomly generated one. 1515 */ 1516 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1517 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1518 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1519 sc->sc_ifaddr = ifs; 1520 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1521 } 1522 1523 ifs->if_bridge = bif; 1524 ifs->if_bridge_output = bridge_output; 1525 ifs->if_bridge_input = bridge_input; 1526 ifs->if_bridge_linkstate = bridge_linkstate; 1527 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1528 /* 1529 * XXX: XLOCK HERE!?! 1530 * 1531 * NOTE: insert_***HEAD*** should be safe for the traversals. 1532 */ 1533 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1534 1535 /* Set interface capabilities to the intersection set of all members */ 1536 bridge_mutecaps(sc); 1537 bridge_linkcheck(sc); 1538 1539 /* Place the interface into promiscuous mode */ 1540 switch (ifs->if_type) { 1541 case IFT_ETHER: 1542 case IFT_L2VLAN: 1543 error = ifpromisc(ifs, 1); 1544 break; 1545 } 1546 1547 if (error) 1548 bridge_delete_member(sc, bif, 0); 1549 return (error); 1550 } 1551 1552 static int 1553 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1554 { 1555 struct ifbreq *req = arg; 1556 struct bridge_iflist *bif; 1557 1558 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1559 if (bif == NULL) 1560 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1561 1562 bridge_delete_member(sc, bif, 0); 1563 1564 return (0); 1565 } 1566 1567 static int 1568 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1569 { 1570 struct ifbreq *req = arg; 1571 struct bridge_iflist *bif; 1572 struct bstp_port *bp; 1573 1574 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1575 if (bif == NULL) 1576 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1577 1578 bp = &bif->bif_stp; 1579 req->ifbr_ifsflags = bif->bif_flags; 1580 req->ifbr_state = bp->bp_state; 1581 req->ifbr_priority = bp->bp_priority; 1582 req->ifbr_path_cost = bp->bp_path_cost; 1583 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1584 req->ifbr_proto = bp->bp_protover; 1585 req->ifbr_role = bp->bp_role; 1586 req->ifbr_stpflags = bp->bp_flags; 1587 req->ifbr_addrcnt = bif->bif_addrcnt; 1588 req->ifbr_addrmax = bif->bif_addrmax; 1589 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1590 req->ifbr_pvid = bif->bif_pvid; 1591 req->ifbr_vlanproto = bif->bif_vlanproto; 1592 1593 /* Copy STP state options as flags */ 1594 if (bp->bp_operedge) 1595 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1596 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1597 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1598 if (bp->bp_ptp_link) 1599 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1600 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1601 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1602 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1603 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1604 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1605 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1606 return (0); 1607 } 1608 1609 static int 1610 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1611 { 1612 struct epoch_tracker et; 1613 struct ifbreq *req = arg; 1614 struct bridge_iflist *bif; 1615 struct bstp_port *bp; 1616 int error; 1617 1618 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1619 if (bif == NULL) 1620 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1621 bp = &bif->bif_stp; 1622 1623 if (req->ifbr_ifsflags & IFBIF_SPAN) 1624 /* SPAN is readonly */ 1625 return (EXTERROR(EINVAL, "Span interface cannot be modified")); 1626 1627 NET_EPOCH_ENTER(et); 1628 1629 if (req->ifbr_ifsflags & IFBIF_STP) { 1630 if ((bif->bif_flags & IFBIF_STP) == 0) { 1631 error = bstp_enable(&bif->bif_stp); 1632 if (error) { 1633 NET_EPOCH_EXIT(et); 1634 return (EXTERROR(error, 1635 "Failed to enable STP")); 1636 } 1637 } 1638 } else { 1639 if ((bif->bif_flags & IFBIF_STP) != 0) 1640 bstp_disable(&bif->bif_stp); 1641 } 1642 1643 /* Pass on STP flags */ 1644 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1645 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1646 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1647 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1648 1649 /* Save the bits relating to the bridge */ 1650 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1651 1652 NET_EPOCH_EXIT(et); 1653 1654 return (0); 1655 } 1656 1657 static int 1658 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1659 { 1660 struct ifbrparam *param = arg; 1661 1662 sc->sc_brtmax = param->ifbrp_csize; 1663 bridge_rttrim(sc); 1664 1665 return (0); 1666 } 1667 1668 static int 1669 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1670 { 1671 struct ifbrparam *param = arg; 1672 1673 param->ifbrp_csize = sc->sc_brtmax; 1674 1675 return (0); 1676 } 1677 1678 static int 1679 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1680 { 1681 struct ifbifconf *bifc = arg; 1682 struct bridge_iflist *bif; 1683 struct ifbreq breq; 1684 char *buf, *outbuf; 1685 int count, buflen, len, error = 0; 1686 1687 count = 0; 1688 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1689 count++; 1690 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1691 count++; 1692 1693 buflen = sizeof(breq) * count; 1694 if (bifc->ifbic_len == 0) { 1695 bifc->ifbic_len = buflen; 1696 return (0); 1697 } 1698 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1699 if (outbuf == NULL) 1700 return (ENOMEM); 1701 1702 count = 0; 1703 buf = outbuf; 1704 len = min(bifc->ifbic_len, buflen); 1705 bzero(&breq, sizeof(breq)); 1706 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1707 if (len < sizeof(breq)) 1708 break; 1709 1710 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1711 sizeof(breq.ifbr_ifsname)); 1712 /* Fill in the ifbreq structure */ 1713 error = bridge_ioctl_gifflags(sc, &breq); 1714 if (error) 1715 break; 1716 memcpy(buf, &breq, sizeof(breq)); 1717 count++; 1718 buf += sizeof(breq); 1719 len -= sizeof(breq); 1720 } 1721 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1722 if (len < sizeof(breq)) 1723 break; 1724 1725 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1726 sizeof(breq.ifbr_ifsname)); 1727 breq.ifbr_ifsflags = bif->bif_flags; 1728 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1729 memcpy(buf, &breq, sizeof(breq)); 1730 count++; 1731 buf += sizeof(breq); 1732 len -= sizeof(breq); 1733 } 1734 1735 bifc->ifbic_len = sizeof(breq) * count; 1736 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1737 free(outbuf, M_TEMP); 1738 return (error); 1739 } 1740 1741 static int 1742 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1743 { 1744 struct ifbaconf *bac = arg; 1745 struct bridge_rtnode *brt; 1746 struct ifbareq bareq; 1747 char *buf, *outbuf; 1748 int count, buflen, len, error = 0; 1749 1750 if (bac->ifbac_len == 0) 1751 return (0); 1752 1753 count = 0; 1754 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1755 count++; 1756 buflen = sizeof(bareq) * count; 1757 1758 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1759 if (outbuf == NULL) 1760 return (ENOMEM); 1761 1762 count = 0; 1763 buf = outbuf; 1764 len = min(bac->ifbac_len, buflen); 1765 bzero(&bareq, sizeof(bareq)); 1766 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1767 if (len < sizeof(bareq)) 1768 goto out; 1769 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1770 sizeof(bareq.ifba_ifsname)); 1771 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1772 bareq.ifba_vlan = brt->brt_vlan; 1773 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1774 time_uptime < brt->brt_expire) 1775 bareq.ifba_expire = brt->brt_expire - time_uptime; 1776 else 1777 bareq.ifba_expire = 0; 1778 bareq.ifba_flags = brt->brt_flags; 1779 1780 memcpy(buf, &bareq, sizeof(bareq)); 1781 count++; 1782 buf += sizeof(bareq); 1783 len -= sizeof(bareq); 1784 } 1785 out: 1786 bac->ifbac_len = sizeof(bareq) * count; 1787 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1788 free(outbuf, M_TEMP); 1789 return (error); 1790 } 1791 1792 static int 1793 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1794 { 1795 struct ifbareq *req = arg; 1796 struct bridge_iflist *bif; 1797 struct epoch_tracker et; 1798 int error; 1799 1800 NET_EPOCH_ENTER(et); 1801 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1802 if (bif == NULL) { 1803 NET_EPOCH_EXIT(et); 1804 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1805 } 1806 1807 /* bridge_rtupdate() may acquire the lock. */ 1808 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1809 req->ifba_flags); 1810 NET_EPOCH_EXIT(et); 1811 1812 return (error); 1813 } 1814 1815 static int 1816 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1817 { 1818 struct ifbrparam *param = arg; 1819 1820 sc->sc_brttimeout = param->ifbrp_ctime; 1821 return (0); 1822 } 1823 1824 static int 1825 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1826 { 1827 struct ifbrparam *param = arg; 1828 1829 param->ifbrp_ctime = sc->sc_brttimeout; 1830 return (0); 1831 } 1832 1833 static int 1834 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1835 { 1836 struct ifbareq *req = arg; 1837 int vlan = req->ifba_vlan; 1838 1839 /* Userspace uses '0' to mean 'any vlan' */ 1840 if (vlan == 0) 1841 vlan = DOT1Q_VID_RSVD_IMPL; 1842 1843 return (bridge_rtdaddr(sc, req->ifba_dst, vlan)); 1844 } 1845 1846 static int 1847 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1848 { 1849 struct ifbreq *req = arg; 1850 1851 BRIDGE_RT_LOCK(sc); 1852 bridge_rtflush(sc, req->ifbr_ifsflags); 1853 BRIDGE_RT_UNLOCK(sc); 1854 1855 return (0); 1856 } 1857 1858 static int 1859 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1860 { 1861 struct ifbrparam *param = arg; 1862 struct bstp_state *bs = &sc->sc_stp; 1863 1864 param->ifbrp_prio = bs->bs_bridge_priority; 1865 return (0); 1866 } 1867 1868 static int 1869 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1870 { 1871 struct ifbrparam *param = arg; 1872 1873 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1874 } 1875 1876 static int 1877 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1878 { 1879 struct ifbrparam *param = arg; 1880 struct bstp_state *bs = &sc->sc_stp; 1881 1882 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1883 return (0); 1884 } 1885 1886 static int 1887 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1888 { 1889 struct ifbrparam *param = arg; 1890 1891 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1892 } 1893 1894 static int 1895 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1896 { 1897 struct ifbrparam *param = arg; 1898 struct bstp_state *bs = &sc->sc_stp; 1899 1900 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1901 return (0); 1902 } 1903 1904 static int 1905 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1906 { 1907 struct ifbrparam *param = arg; 1908 1909 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1910 } 1911 1912 static int 1913 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1914 { 1915 struct ifbrparam *param = arg; 1916 struct bstp_state *bs = &sc->sc_stp; 1917 1918 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1919 return (0); 1920 } 1921 1922 static int 1923 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1924 { 1925 struct ifbrparam *param = arg; 1926 1927 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1928 } 1929 1930 static int 1931 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1932 { 1933 struct ifbreq *req = arg; 1934 struct bridge_iflist *bif; 1935 1936 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1937 if (bif == NULL) 1938 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1939 1940 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1941 } 1942 1943 static int 1944 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1945 { 1946 struct ifbreq *req = arg; 1947 struct bridge_iflist *bif; 1948 1949 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1950 if (bif == NULL) 1951 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1952 1953 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1954 } 1955 1956 static int 1957 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1958 { 1959 struct ifbreq *req = arg; 1960 struct bridge_iflist *bif; 1961 1962 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1963 if (bif == NULL) 1964 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1965 1966 bif->bif_addrmax = req->ifbr_addrmax; 1967 return (0); 1968 } 1969 1970 static int 1971 bridge_ioctl_sifpvid(struct bridge_softc *sc, void *arg) 1972 { 1973 struct ifbreq *req = arg; 1974 struct bridge_iflist *bif; 1975 1976 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1977 if (bif == NULL) 1978 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1979 1980 if (req->ifbr_pvid > DOT1Q_VID_MAX) 1981 return (EXTERROR(EINVAL, "Invalid VLAN ID")); 1982 1983 bif->bif_pvid = req->ifbr_pvid; 1984 return (0); 1985 } 1986 1987 static int 1988 bridge_ioctl_sifvlanset(struct bridge_softc *sc, void *arg) 1989 { 1990 struct ifbif_vlan_req *req = arg; 1991 struct bridge_iflist *bif; 1992 1993 if ((sc->sc_flags & IFBRF_VLANFILTER) == 0) 1994 return (EXTERROR(EINVAL, "VLAN filtering not enabled")); 1995 1996 bif = bridge_lookup_member(sc, req->bv_ifname); 1997 if (bif == NULL) 1998 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1999 2000 /* Reject invalid VIDs. */ 2001 if (BRVLAN_TEST(&req->bv_set, DOT1Q_VID_NULL) || 2002 BRVLAN_TEST(&req->bv_set, DOT1Q_VID_RSVD_IMPL)) 2003 return (EXTERROR(EINVAL, "Invalid VLAN ID in set")); 2004 2005 switch (req->bv_op) { 2006 /* Replace the existing vlan set with the new set */ 2007 case BRDG_VLAN_OP_SET: 2008 BIT_COPY(BRVLAN_SETSIZE, &req->bv_set, &bif->bif_vlan_set); 2009 break; 2010 2011 /* Modify the existing vlan set to add the given vlans */ 2012 case BRDG_VLAN_OP_ADD: 2013 BIT_OR(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2014 break; 2015 2016 /* Modify the existing vlan set to remove the given vlans */ 2017 case BRDG_VLAN_OP_DEL: 2018 BIT_ANDNOT(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2019 break; 2020 2021 /* Invalid or unknown operation */ 2022 default: 2023 return (EXTERROR(EINVAL, 2024 "Unsupported BRDGSIFVLANSET operation")); 2025 } 2026 2027 return (0); 2028 } 2029 2030 static int 2031 bridge_ioctl_gifvlanset(struct bridge_softc *sc, void *arg) 2032 { 2033 struct ifbif_vlan_req *req = arg; 2034 struct bridge_iflist *bif; 2035 2036 bif = bridge_lookup_member(sc, req->bv_ifname); 2037 if (bif == NULL) 2038 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2039 2040 BIT_COPY(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2041 return (0); 2042 } 2043 2044 static int 2045 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 2046 { 2047 struct ifbreq *req = arg; 2048 struct bridge_iflist *bif = NULL; 2049 struct ifnet *ifs; 2050 2051 ifs = ifunit(req->ifbr_ifsname); 2052 if (ifs == NULL) 2053 return (EXTERROR(ENOENT, "No such interface")); 2054 2055 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2056 if (ifs == bif->bif_ifp) 2057 return (EXTERROR(EBUSY, 2058 "Interface is already a span port")); 2059 2060 if (ifs->if_bridge != NULL) 2061 return (EXTERROR(EEXIST, 2062 "Interface is already a bridge member")); 2063 2064 switch (ifs->if_type) { 2065 case IFT_ETHER: 2066 case IFT_GIF: 2067 case IFT_L2VLAN: 2068 break; 2069 default: 2070 return (EXTERROR(EINVAL, "Unsupported interface type")); 2071 } 2072 2073 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 2074 if (bif == NULL) 2075 return (ENOMEM); 2076 2077 bif->bif_ifp = ifs; 2078 bif->bif_flags = IFBIF_SPAN; 2079 2080 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 2081 2082 return (0); 2083 } 2084 2085 static int 2086 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 2087 { 2088 struct ifbreq *req = arg; 2089 struct bridge_iflist *bif; 2090 struct ifnet *ifs; 2091 2092 ifs = ifunit(req->ifbr_ifsname); 2093 if (ifs == NULL) 2094 return (EXTERROR(ENOENT, "No such interface")); 2095 2096 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2097 if (ifs == bif->bif_ifp) 2098 break; 2099 2100 if (bif == NULL) 2101 return (EXTERROR(ENOENT, "Interface is not a span port")); 2102 2103 bridge_delete_span(sc, bif); 2104 2105 return (0); 2106 } 2107 2108 static int 2109 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 2110 { 2111 struct ifbropreq *req = arg; 2112 struct bstp_state *bs = &sc->sc_stp; 2113 struct bstp_port *root_port; 2114 2115 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 2116 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 2117 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 2118 2119 root_port = bs->bs_root_port; 2120 if (root_port == NULL) 2121 req->ifbop_root_port = 0; 2122 else 2123 req->ifbop_root_port = root_port->bp_ifp->if_index; 2124 2125 req->ifbop_holdcount = bs->bs_txholdcount; 2126 req->ifbop_priority = bs->bs_bridge_priority; 2127 req->ifbop_protocol = bs->bs_protover; 2128 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 2129 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 2130 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 2131 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 2132 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 2133 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 2134 2135 return (0); 2136 } 2137 2138 static int 2139 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 2140 { 2141 struct ifbrparam *param = arg; 2142 2143 param->ifbrp_cexceeded = sc->sc_brtexceeded; 2144 return (0); 2145 } 2146 2147 static int 2148 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 2149 { 2150 struct ifbpstpconf *bifstp = arg; 2151 struct bridge_iflist *bif; 2152 struct bstp_port *bp; 2153 struct ifbpstpreq bpreq; 2154 char *buf, *outbuf; 2155 int count, buflen, len, error = 0; 2156 2157 count = 0; 2158 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2159 if ((bif->bif_flags & IFBIF_STP) != 0) 2160 count++; 2161 } 2162 2163 buflen = sizeof(bpreq) * count; 2164 if (bifstp->ifbpstp_len == 0) { 2165 bifstp->ifbpstp_len = buflen; 2166 return (0); 2167 } 2168 2169 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 2170 if (outbuf == NULL) 2171 return (ENOMEM); 2172 2173 count = 0; 2174 buf = outbuf; 2175 len = min(bifstp->ifbpstp_len, buflen); 2176 bzero(&bpreq, sizeof(bpreq)); 2177 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2178 if (len < sizeof(bpreq)) 2179 break; 2180 2181 if ((bif->bif_flags & IFBIF_STP) == 0) 2182 continue; 2183 2184 bp = &bif->bif_stp; 2185 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 2186 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 2187 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 2188 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 2189 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 2190 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 2191 2192 memcpy(buf, &bpreq, sizeof(bpreq)); 2193 count++; 2194 buf += sizeof(bpreq); 2195 len -= sizeof(bpreq); 2196 } 2197 2198 bifstp->ifbpstp_len = sizeof(bpreq) * count; 2199 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 2200 free(outbuf, M_TEMP); 2201 return (error); 2202 } 2203 2204 static int 2205 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 2206 { 2207 struct ifbrparam *param = arg; 2208 2209 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 2210 } 2211 2212 static int 2213 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 2214 { 2215 struct ifbrparam *param = arg; 2216 2217 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 2218 } 2219 2220 static int 2221 bridge_ioctl_gflags(struct bridge_softc *sc, void *arg) 2222 { 2223 struct ifbrparam *param = arg; 2224 2225 param->ifbrp_flags = sc->sc_flags; 2226 2227 return (0); 2228 } 2229 2230 static int 2231 bridge_ioctl_sflags(struct bridge_softc *sc, void *arg) 2232 { 2233 struct ifbrparam *param = arg; 2234 2235 sc->sc_flags = param->ifbrp_flags; 2236 2237 return (0); 2238 } 2239 2240 static int 2241 bridge_ioctl_gdefpvid(struct bridge_softc *sc, void *arg) 2242 { 2243 struct ifbrparam *param = arg; 2244 2245 param->ifbrp_defpvid = sc->sc_defpvid; 2246 2247 return (0); 2248 } 2249 2250 static int 2251 bridge_ioctl_sdefpvid(struct bridge_softc *sc, void *arg) 2252 { 2253 struct ifbrparam *param = arg; 2254 2255 /* Reject invalid VIDs, but allow 0 to mean 'none'. */ 2256 if (param->ifbrp_defpvid > DOT1Q_VID_MAX) 2257 return (EINVAL); 2258 2259 sc->sc_defpvid = param->ifbrp_defpvid; 2260 2261 return (0); 2262 } 2263 2264 static int 2265 bridge_ioctl_svlanproto(struct bridge_softc *sc, void *arg) 2266 { 2267 struct ifbreq *req = arg; 2268 struct bridge_iflist *bif; 2269 2270 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 2271 if (bif == NULL) 2272 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2273 2274 if (req->ifbr_vlanproto != ETHERTYPE_VLAN && 2275 req->ifbr_vlanproto != ETHERTYPE_QINQ) 2276 return (EXTERROR(EINVAL, "Invalid VLAN protocol")); 2277 2278 bif->bif_vlanproto = req->ifbr_vlanproto; 2279 2280 return (0); 2281 } 2282 /* 2283 * bridge_ifdetach: 2284 * 2285 * Detach an interface from a bridge. Called when a member 2286 * interface is detaching. 2287 */ 2288 static void 2289 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 2290 { 2291 struct bridge_iflist *bif = ifp->if_bridge; 2292 struct bridge_softc *sc = NULL; 2293 2294 if (bif) 2295 sc = bif->bif_sc; 2296 2297 if (ifp->if_flags & IFF_RENAMING) 2298 return; 2299 if (V_bridge_cloner == NULL) { 2300 /* 2301 * This detach handler can be called after 2302 * vnet_bridge_uninit(). Just return in that case. 2303 */ 2304 return; 2305 } 2306 /* Check if the interface is a bridge member */ 2307 if (sc != NULL) { 2308 BRIDGE_LOCK(sc); 2309 bridge_delete_member(sc, bif, 1); 2310 BRIDGE_UNLOCK(sc); 2311 return; 2312 } 2313 2314 /* Check if the interface is a span port */ 2315 BRIDGE_LIST_LOCK(); 2316 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 2317 BRIDGE_LOCK(sc); 2318 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2319 if (ifp == bif->bif_ifp) { 2320 bridge_delete_span(sc, bif); 2321 break; 2322 } 2323 2324 BRIDGE_UNLOCK(sc); 2325 } 2326 BRIDGE_LIST_UNLOCK(); 2327 } 2328 2329 /* 2330 * bridge_init: 2331 * 2332 * Initialize a bridge interface. 2333 */ 2334 static void 2335 bridge_init(void *xsc) 2336 { 2337 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2338 struct ifnet *ifp = sc->sc_ifp; 2339 2340 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2341 return; 2342 2343 BRIDGE_LOCK(sc); 2344 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2345 bridge_timer, sc); 2346 2347 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2348 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2349 2350 BRIDGE_UNLOCK(sc); 2351 } 2352 2353 /* 2354 * bridge_stop: 2355 * 2356 * Stop the bridge interface. 2357 */ 2358 static void 2359 bridge_stop(struct ifnet *ifp, int disable) 2360 { 2361 struct bridge_softc *sc = ifp->if_softc; 2362 2363 BRIDGE_LOCK_ASSERT(sc); 2364 2365 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2366 return; 2367 2368 BRIDGE_RT_LOCK(sc); 2369 callout_stop(&sc->sc_brcallout); 2370 2371 bstp_stop(&sc->sc_stp); 2372 2373 bridge_rtflush(sc, IFBF_FLUSHDYN); 2374 BRIDGE_RT_UNLOCK(sc); 2375 2376 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2377 } 2378 2379 /* 2380 * bridge_enqueue: 2381 * 2382 * Enqueue a packet on a bridge member interface. 2383 * 2384 */ 2385 static int 2386 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 2387 struct bridge_iflist *bif) 2388 { 2389 int len, err = 0; 2390 short mflags; 2391 struct mbuf *m0; 2392 2393 /* 2394 * Find the bridge member port this packet is being sent on, if the 2395 * caller didn't already provide it. 2396 */ 2397 if (bif == NULL) 2398 bif = bridge_lookup_member_if(sc, dst_ifp); 2399 if (bif == NULL) { 2400 /* Perhaps the interface was removed from the bridge */ 2401 m_freem(m); 2402 return (EINVAL); 2403 } 2404 2405 /* Do VLAN filtering. */ 2406 if (!bridge_vfilter_out(bif, m)) { 2407 m_freem(m); 2408 return (0); 2409 } 2410 2411 /* We may be sending a fragment so traverse the mbuf */ 2412 for (; m; m = m0) { 2413 m0 = m->m_nextpkt; 2414 m->m_nextpkt = NULL; 2415 len = m->m_pkthdr.len; 2416 mflags = m->m_flags; 2417 2418 /* 2419 * If the native VLAN ID of the outgoing interface matches the 2420 * VLAN ID of the frame, remove the VLAN tag. 2421 */ 2422 if (bif->bif_pvid != DOT1Q_VID_NULL && 2423 VLANTAGOF(m) == bif->bif_pvid) { 2424 m->m_flags &= ~M_VLANTAG; 2425 m->m_pkthdr.ether_vtag = 0; 2426 } 2427 2428 /* 2429 * There are two cases where we have to insert our own tag: 2430 * if the member interface doesn't support hardware tagging, 2431 * or if the tag proto is not 802.1q. 2432 */ 2433 if ((m->m_flags & M_VLANTAG) && 2434 ((dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0 || 2435 bif->bif_vlanproto != ETHERTYPE_VLAN)) { 2436 m = ether_vlanencap_proto(m, m->m_pkthdr.ether_vtag, 2437 bif->bif_vlanproto); 2438 if (m == NULL) { 2439 if_printf(dst_ifp, 2440 "unable to prepend VLAN header\n"); 2441 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2442 continue; 2443 } 2444 m->m_flags &= ~M_VLANTAG; 2445 } 2446 2447 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2448 /* 2449 * XXXZL: gif(4) requires the af to be saved in csum_data field 2450 * so that gif_transmit() routine can pull it back. 2451 */ 2452 if (dst_ifp->if_type == IFT_GIF) 2453 m->m_pkthdr.csum_data = AF_LINK; 2454 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2455 int n; 2456 2457 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2458 m0 = m->m_nextpkt; 2459 m_freem(m); 2460 } 2461 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2462 break; 2463 } 2464 2465 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2466 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2467 if (mflags & M_MCAST) 2468 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2469 } 2470 2471 return (err); 2472 } 2473 2474 /* 2475 * bridge_dummynet: 2476 * 2477 * Receive a queued packet from dummynet and pass it on to the output 2478 * interface. 2479 * 2480 * The mbuf has the Ethernet header already attached. 2481 */ 2482 static void 2483 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2484 { 2485 struct bridge_iflist *bif = ifp->if_bridge; 2486 struct bridge_softc *sc = NULL; 2487 2488 if (bif) 2489 sc = bif->bif_sc; 2490 2491 /* 2492 * The packet didnt originate from a member interface. This should only 2493 * ever happen if a member interface is removed while packets are 2494 * queued for it. 2495 */ 2496 if (sc == NULL) { 2497 m_freem(m); 2498 return; 2499 } 2500 2501 if (PFIL_HOOKED_OUT_46) { 2502 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2503 return; 2504 if (m == NULL) 2505 return; 2506 } 2507 2508 bridge_enqueue(sc, ifp, m, NULL); 2509 } 2510 2511 /* 2512 * bridge_output: 2513 * 2514 * Send output from a bridge member interface. This 2515 * performs the bridging function for locally originated 2516 * packets. 2517 * 2518 * The mbuf has the Ethernet header already attached. We must 2519 * enqueue or free the mbuf before returning. 2520 */ 2521 static int 2522 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2523 struct rtentry *rt) 2524 { 2525 struct ether_header *eh; 2526 struct bridge_iflist *sbif; 2527 struct ifnet *bifp, *dst_if; 2528 struct bridge_softc *sc; 2529 ether_vlanid_t vlan; 2530 2531 NET_EPOCH_ASSERT(); 2532 2533 if (m->m_len < ETHER_HDR_LEN) { 2534 m = m_pullup(m, ETHER_HDR_LEN); 2535 if (m == NULL) 2536 return (0); 2537 } 2538 2539 sbif = ifp->if_bridge; 2540 sc = sbif->bif_sc; 2541 bifp = sc->sc_ifp; 2542 2543 eh = mtod(m, struct ether_header *); 2544 vlan = VLANTAGOF(m); 2545 2546 /* 2547 * If bridge is down, but the original output interface is up, 2548 * go ahead and send out that interface. Otherwise, the packet 2549 * is dropped below. 2550 */ 2551 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2552 dst_if = ifp; 2553 goto sendunicast; 2554 } 2555 2556 /* 2557 * If the packet is a multicast, or we don't know a better way to 2558 * get there, send to all interfaces. 2559 */ 2560 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2561 dst_if = NULL; 2562 else 2563 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2564 /* Tap any traffic not passing back out the originating interface */ 2565 if (dst_if != ifp) 2566 ETHER_BPF_MTAP(bifp, m); 2567 if (dst_if == NULL) { 2568 struct bridge_iflist *bif; 2569 struct mbuf *mc; 2570 int used = 0; 2571 2572 bridge_span(sc, m); 2573 2574 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2575 dst_if = bif->bif_ifp; 2576 2577 if (dst_if->if_type == IFT_GIF) 2578 continue; 2579 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2580 continue; 2581 2582 /* 2583 * If this is not the original output interface, 2584 * and the interface is participating in spanning 2585 * tree, make sure the port is in a state that 2586 * allows forwarding. 2587 */ 2588 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2589 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2590 continue; 2591 2592 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2593 used = 1; 2594 mc = m; 2595 } else { 2596 mc = m_dup(m, M_NOWAIT); 2597 if (mc == NULL) { 2598 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2599 continue; 2600 } 2601 } 2602 2603 bridge_enqueue(sc, dst_if, mc, bif); 2604 } 2605 if (used == 0) 2606 m_freem(m); 2607 return (0); 2608 } 2609 2610 sendunicast: 2611 /* 2612 * XXX Spanning tree consideration here? 2613 */ 2614 2615 bridge_span(sc, m); 2616 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2617 m_freem(m); 2618 return (0); 2619 } 2620 2621 bridge_enqueue(sc, dst_if, m, NULL); 2622 return (0); 2623 } 2624 2625 /* 2626 * bridge_transmit: 2627 * 2628 * Do output on a bridge. 2629 * 2630 */ 2631 static int 2632 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2633 { 2634 struct bridge_softc *sc; 2635 struct ether_header *eh; 2636 struct ifnet *dst_if; 2637 int error = 0; 2638 ether_vlanid_t vlan; 2639 2640 sc = ifp->if_softc; 2641 2642 ETHER_BPF_MTAP(ifp, m); 2643 2644 eh = mtod(m, struct ether_header *); 2645 vlan = VLANTAGOF(m); 2646 2647 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2648 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan)) != NULL) { 2649 error = bridge_enqueue(sc, dst_if, m, NULL); 2650 } else 2651 bridge_broadcast(sc, ifp, m, 0); 2652 2653 return (error); 2654 } 2655 2656 #ifdef ALTQ 2657 static void 2658 bridge_altq_start(if_t ifp) 2659 { 2660 struct ifaltq *ifq = &ifp->if_snd; 2661 struct mbuf *m; 2662 2663 IFQ_LOCK(ifq); 2664 IFQ_DEQUEUE_NOLOCK(ifq, m); 2665 while (m != NULL) { 2666 bridge_transmit(ifp, m); 2667 IFQ_DEQUEUE_NOLOCK(ifq, m); 2668 } 2669 IFQ_UNLOCK(ifq); 2670 } 2671 2672 static int 2673 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2674 { 2675 int err; 2676 2677 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2678 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2679 if (err == 0) 2680 bridge_altq_start(ifp); 2681 } else 2682 err = bridge_transmit(ifp, m); 2683 2684 return (err); 2685 } 2686 #endif /* ALTQ */ 2687 2688 /* 2689 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2690 */ 2691 static void 2692 bridge_qflush(struct ifnet *ifp __unused) 2693 { 2694 } 2695 2696 /* 2697 * bridge_forward: 2698 * 2699 * The forwarding function of the bridge. 2700 * 2701 * NOTE: Releases the lock on return. 2702 */ 2703 static void 2704 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2705 struct mbuf *m) 2706 { 2707 struct bridge_iflist *dbif; 2708 struct ifnet *src_if, *dst_if, *ifp; 2709 struct ether_header *eh; 2710 uint8_t *dst; 2711 int error; 2712 ether_vlanid_t vlan; 2713 2714 NET_EPOCH_ASSERT(); 2715 2716 src_if = m->m_pkthdr.rcvif; 2717 ifp = sc->sc_ifp; 2718 vlan = VLANTAGOF(m); 2719 2720 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2721 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2722 2723 if ((sbif->bif_flags & IFBIF_STP) && 2724 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2725 goto drop; 2726 2727 eh = mtod(m, struct ether_header *); 2728 dst = eh->ether_dhost; 2729 2730 /* If the interface is learning, record the address. */ 2731 if (sbif->bif_flags & IFBIF_LEARNING) { 2732 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2733 sbif, 0, IFBAF_DYNAMIC); 2734 /* 2735 * If the interface has addresses limits then deny any source 2736 * that is not in the cache. 2737 */ 2738 if (error && sbif->bif_addrmax) 2739 goto drop; 2740 } 2741 2742 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2743 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2744 goto drop; 2745 2746 #ifdef DEV_NETMAP 2747 /* 2748 * Hand the packet to netmap only if it wasn't injected by netmap 2749 * itself. 2750 */ 2751 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2752 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2753 ifp->if_input(ifp, m); 2754 return; 2755 } 2756 m->m_flags &= ~M_BRIDGE_INJECT; 2757 #endif 2758 2759 /* 2760 * At this point, the port either doesn't participate 2761 * in spanning tree or it is in the forwarding state. 2762 */ 2763 2764 /* 2765 * If the packet is unicast, destined for someone on 2766 * "this" side of the bridge, drop it. 2767 */ 2768 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2769 dst_if = bridge_rtlookup(sc, dst, vlan); 2770 if (src_if == dst_if) 2771 goto drop; 2772 } else { 2773 /* 2774 * Check if its a reserved multicast address, any address 2775 * listed in 802.1D section 7.12.6 may not be forwarded by the 2776 * bridge. 2777 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2778 */ 2779 if (dst[0] == 0x01 && dst[1] == 0x80 && 2780 dst[2] == 0xc2 && dst[3] == 0x00 && 2781 dst[4] == 0x00 && dst[5] <= 0x0f) 2782 goto drop; 2783 2784 /* ...forward it to all interfaces. */ 2785 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2786 dst_if = NULL; 2787 } 2788 2789 /* 2790 * If we have a destination interface which is a member of our bridge, 2791 * OR this is a unicast packet, push it through the bpf(4) machinery. 2792 * For broadcast or multicast packets, don't bother because it will 2793 * be reinjected into ether_input. We do this before we pass the packets 2794 * through the pfil(9) framework, as it is possible that pfil(9) will 2795 * drop the packet, or possibly modify it, making it difficult to debug 2796 * firewall issues on the bridge. 2797 */ 2798 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2799 ETHER_BPF_MTAP(ifp, m); 2800 2801 /* run the packet filter */ 2802 if (PFIL_HOOKED_IN_46) { 2803 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2804 return; 2805 if (m == NULL) 2806 return; 2807 } 2808 2809 if (dst_if == NULL) { 2810 bridge_broadcast(sc, src_if, m, 1); 2811 return; 2812 } 2813 2814 /* 2815 * At this point, we're dealing with a unicast frame 2816 * going to a different interface. 2817 */ 2818 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2819 goto drop; 2820 2821 dbif = bridge_lookup_member_if(sc, dst_if); 2822 if (dbif == NULL) 2823 /* Not a member of the bridge (anymore?) */ 2824 goto drop; 2825 2826 /* Private segments can not talk to each other */ 2827 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2828 goto drop; 2829 2830 if ((dbif->bif_flags & IFBIF_STP) && 2831 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2832 goto drop; 2833 2834 if (PFIL_HOOKED_OUT_46) { 2835 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2836 return; 2837 if (m == NULL) 2838 return; 2839 } 2840 2841 bridge_enqueue(sc, dst_if, m, dbif); 2842 return; 2843 2844 drop: 2845 m_freem(m); 2846 } 2847 2848 /* 2849 * bridge_input: 2850 * 2851 * Receive input from a member interface. Queue the packet for 2852 * bridging if it is not for us. 2853 */ 2854 static struct mbuf * 2855 bridge_input(struct ifnet *ifp, struct mbuf *m) 2856 { 2857 struct bridge_softc *sc = NULL; 2858 struct bridge_iflist *bif, *bif2; 2859 struct ifnet *bifp; 2860 struct ether_header *eh; 2861 struct mbuf *mc, *mc2; 2862 ether_vlanid_t vlan; 2863 int error; 2864 2865 NET_EPOCH_ASSERT(); 2866 2867 /* We need the Ethernet header later, so make sure we have it now. */ 2868 if (m->m_len < ETHER_HDR_LEN) { 2869 m = m_pullup(m, ETHER_HDR_LEN); 2870 if (m == NULL) { 2871 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2872 m_freem(m); 2873 return (NULL); 2874 } 2875 } 2876 2877 eh = mtod(m, struct ether_header *); 2878 vlan = VLANTAGOF(m); 2879 2880 /* 2881 * If this frame has a VLAN tag and the receiving interface has a 2882 * vlan(4) trunk, then it is is destined for vlan(4), not for us. 2883 * This means if vlan(4) and bridge(4) are configured on the same 2884 * interface, vlan(4) is preferred, which is what users typically 2885 * expect. 2886 */ 2887 if (vlan != DOT1Q_VID_NULL && ifp->if_vlantrunk != NULL) 2888 return (m); 2889 2890 bif = ifp->if_bridge; 2891 if (bif) 2892 sc = bif->bif_sc; 2893 2894 if (sc == NULL) { 2895 /* 2896 * This packet originated from the bridge itself, so it must 2897 * have been transmitted by netmap. Derive the "source" 2898 * interface from the source address and drop the packet if the 2899 * source address isn't known. 2900 */ 2901 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2902 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2903 sc = if_getsoftc(ifp); 2904 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2905 if (ifp == NULL) { 2906 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2907 m_freem(m); 2908 return (NULL); 2909 } 2910 m->m_pkthdr.rcvif = ifp; 2911 } 2912 bifp = sc->sc_ifp; 2913 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2914 return (m); 2915 2916 /* 2917 * Implement support for bridge monitoring. If this flag has been 2918 * set on this interface, discard the packet once we push it through 2919 * the bpf(4) machinery, but before we do, increment the byte and 2920 * packet counters associated with this interface. 2921 */ 2922 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2923 m->m_pkthdr.rcvif = bifp; 2924 ETHER_BPF_MTAP(bifp, m); 2925 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2926 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2927 m_freem(m); 2928 return (NULL); 2929 } 2930 2931 /* Do VLAN filtering. */ 2932 if (!bridge_vfilter_in(bif, m)) { 2933 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2934 m_freem(m); 2935 return (NULL); 2936 } 2937 /* bridge_vfilter_in() may add a tag */ 2938 vlan = VLANTAGOF(m); 2939 2940 bridge_span(sc, m); 2941 2942 if (m->m_flags & (M_BCAST|M_MCAST)) { 2943 /* Tap off 802.1D packets; they do not get forwarded. */ 2944 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2945 ETHER_ADDR_LEN) == 0) { 2946 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2947 return (NULL); 2948 } 2949 2950 if ((bif->bif_flags & IFBIF_STP) && 2951 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2952 return (m); 2953 } 2954 2955 /* 2956 * Make a deep copy of the packet and enqueue the copy 2957 * for bridge processing; return the original packet for 2958 * local processing. 2959 */ 2960 mc = m_dup(m, M_NOWAIT); 2961 if (mc == NULL) { 2962 return (m); 2963 } 2964 2965 /* Perform the bridge forwarding function with the copy. */ 2966 bridge_forward(sc, bif, mc); 2967 2968 #ifdef DEV_NETMAP 2969 /* 2970 * If netmap is enabled and has not already seen this packet, 2971 * then it will be consumed by bridge_forward(). 2972 */ 2973 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2974 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2975 m_freem(m); 2976 return (NULL); 2977 } 2978 #endif 2979 2980 /* 2981 * Reinject the mbuf as arriving on the bridge so we have a 2982 * chance at claiming multicast packets. We can not loop back 2983 * here from ether_input as a bridge is never a member of a 2984 * bridge. 2985 */ 2986 KASSERT(bifp->if_bridge == NULL, 2987 ("loop created in bridge_input")); 2988 mc2 = m_dup(m, M_NOWAIT); 2989 if (mc2 != NULL) { 2990 /* Keep the layer3 header aligned */ 2991 int i = min(mc2->m_pkthdr.len, max_protohdr); 2992 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2993 } 2994 if (mc2 != NULL) { 2995 mc2->m_pkthdr.rcvif = bifp; 2996 mc2->m_flags &= ~M_BRIDGE_INJECT; 2997 sc->sc_if_input(bifp, mc2); 2998 } 2999 3000 /* Return the original packet for local processing. */ 3001 return (m); 3002 } 3003 3004 if ((bif->bif_flags & IFBIF_STP) && 3005 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 3006 return (m); 3007 } 3008 3009 #if defined(INET) || defined(INET6) 3010 #define CARP_CHECK_WE_ARE_DST(iface) \ 3011 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 3012 #define CARP_CHECK_WE_ARE_SRC(iface) \ 3013 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 3014 #else 3015 #define CARP_CHECK_WE_ARE_DST(iface) false 3016 #define CARP_CHECK_WE_ARE_SRC(iface) false 3017 #endif 3018 3019 #ifdef DEV_NETMAP 3020 #define GRAB_FOR_NETMAP(ifp, m) do { \ 3021 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 3022 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 3023 (ifp)->if_input(ifp, m); \ 3024 return (NULL); \ 3025 } \ 3026 } while (0) 3027 #else 3028 #define GRAB_FOR_NETMAP(ifp, m) 3029 #endif 3030 3031 #define GRAB_OUR_PACKETS(iface) \ 3032 if ((iface)->if_type == IFT_GIF) \ 3033 continue; \ 3034 /* It is destined for us. */ \ 3035 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 3036 CARP_CHECK_WE_ARE_DST(iface)) { \ 3037 if (bif->bif_flags & IFBIF_LEARNING) { \ 3038 error = bridge_rtupdate(sc, eh->ether_shost, \ 3039 vlan, bif, 0, IFBAF_DYNAMIC); \ 3040 if (error && bif->bif_addrmax) { \ 3041 m_freem(m); \ 3042 return (NULL); \ 3043 } \ 3044 } \ 3045 m->m_pkthdr.rcvif = iface; \ 3046 if ((iface) == ifp) { \ 3047 /* Skip bridge processing... src == dest */ \ 3048 return (m); \ 3049 } \ 3050 /* It's passing over or to the bridge, locally. */ \ 3051 ETHER_BPF_MTAP(bifp, m); \ 3052 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 3053 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 3054 /* Hand the packet over to netmap if necessary. */ \ 3055 GRAB_FOR_NETMAP(bifp, m); \ 3056 /* Filter on the physical interface. */ \ 3057 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \ 3058 if (bridge_pfil(&m, NULL, ifp, \ 3059 PFIL_IN) != 0 || m == NULL) { \ 3060 return (NULL); \ 3061 } \ 3062 } \ 3063 if ((iface) != bifp) \ 3064 ETHER_BPF_MTAP(iface, m); \ 3065 /* Pass tagged packets to if_vlan, if it's loaded */ \ 3066 if (VLANTAGOF(m) != 0) { \ 3067 if (bifp->if_vlantrunk == NULL) { \ 3068 m_freem(m); \ 3069 return (NULL); \ 3070 } \ 3071 (*vlan_input_p)(bifp, m); \ 3072 return (NULL); \ 3073 } \ 3074 return (m); \ 3075 } \ 3076 \ 3077 /* We just received a packet that we sent out. */ \ 3078 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 3079 CARP_CHECK_WE_ARE_SRC(iface)) { \ 3080 m_freem(m); \ 3081 return (NULL); \ 3082 } 3083 3084 /* 3085 * Unicast. Make sure it's not for the bridge. 3086 */ 3087 do { GRAB_OUR_PACKETS(bifp) } while (0); 3088 3089 /* 3090 * If member_ifaddrs is enabled, see if the packet is destined for 3091 * one of the members' addresses. 3092 */ 3093 if (V_member_ifaddrs) { 3094 /* Check the interface the packet arrived on. */ 3095 do { GRAB_OUR_PACKETS(ifp) } while (0); 3096 3097 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 3098 GRAB_OUR_PACKETS(bif2->bif_ifp) 3099 } 3100 } 3101 3102 #undef CARP_CHECK_WE_ARE_DST 3103 #undef CARP_CHECK_WE_ARE_SRC 3104 #undef GRAB_FOR_NETMAP 3105 #undef GRAB_OUR_PACKETS 3106 3107 /* Perform the bridge forwarding function. */ 3108 bridge_forward(sc, bif, m); 3109 3110 return (NULL); 3111 } 3112 3113 /* 3114 * Inject a packet back into the host ethernet stack. This will generally only 3115 * be used by netmap when an application writes to the host TX ring. The 3116 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 3117 * interface after ethernet processing. 3118 */ 3119 static void 3120 bridge_inject(struct ifnet *ifp, struct mbuf *m) 3121 { 3122 struct bridge_softc *sc; 3123 3124 if (ifp->if_type == IFT_L2VLAN) { 3125 /* 3126 * vlan(4) gives us the vlan ifnet, so we need to get the 3127 * bridge softc to get a pointer to ether_input to send the 3128 * packet to. 3129 */ 3130 struct ifnet *bifp = NULL; 3131 3132 if (vlan_trunkdev_p == NULL) { 3133 m_freem(m); 3134 return; 3135 } 3136 3137 bifp = vlan_trunkdev_p(ifp); 3138 if (bifp == NULL) { 3139 m_freem(m); 3140 return; 3141 } 3142 3143 sc = if_getsoftc(bifp); 3144 sc->sc_if_input(ifp, m); 3145 return; 3146 } 3147 3148 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 3149 ("%s: iface %s is not running in netmap mode", 3150 __func__, if_name(ifp))); 3151 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 3152 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 3153 3154 m->m_flags |= M_BRIDGE_INJECT; 3155 sc = if_getsoftc(ifp); 3156 sc->sc_if_input(ifp, m); 3157 } 3158 3159 /* 3160 * bridge_broadcast: 3161 * 3162 * Send a frame to all interfaces that are members of 3163 * the bridge, except for the one on which the packet 3164 * arrived. 3165 * 3166 * NOTE: Releases the lock on return. 3167 */ 3168 static void 3169 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 3170 struct mbuf *m, int runfilt) 3171 { 3172 struct bridge_iflist *dbif, *sbif; 3173 struct mbuf *mc; 3174 struct ifnet *dst_if; 3175 int used = 0, i; 3176 3177 NET_EPOCH_ASSERT(); 3178 3179 sbif = bridge_lookup_member_if(sc, src_if); 3180 3181 /* Filter on the bridge interface before broadcasting */ 3182 if (runfilt && PFIL_HOOKED_OUT_46) { 3183 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 3184 return; 3185 if (m == NULL) 3186 return; 3187 } 3188 3189 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 3190 dst_if = dbif->bif_ifp; 3191 if (dst_if == src_if) 3192 continue; 3193 3194 /* Private segments can not talk to each other */ 3195 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 3196 continue; 3197 3198 if ((dbif->bif_flags & IFBIF_STP) && 3199 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 3200 continue; 3201 3202 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 3203 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 3204 continue; 3205 3206 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3207 continue; 3208 3209 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 3210 mc = m; 3211 used = 1; 3212 } else { 3213 mc = m_dup(m, M_NOWAIT); 3214 if (mc == NULL) { 3215 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3216 continue; 3217 } 3218 } 3219 3220 /* 3221 * Filter on the output interface. Pass a NULL bridge interface 3222 * pointer so we do not redundantly filter on the bridge for 3223 * each interface we broadcast on. 3224 */ 3225 if (runfilt && PFIL_HOOKED_OUT_46) { 3226 if (used == 0) { 3227 /* Keep the layer3 header aligned */ 3228 i = min(mc->m_pkthdr.len, max_protohdr); 3229 mc = m_copyup(mc, i, ETHER_ALIGN); 3230 if (mc == NULL) { 3231 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3232 continue; 3233 } 3234 } 3235 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 3236 continue; 3237 if (mc == NULL) 3238 continue; 3239 } 3240 3241 bridge_enqueue(sc, dst_if, mc, dbif); 3242 } 3243 if (used == 0) 3244 m_freem(m); 3245 } 3246 3247 /* 3248 * bridge_span: 3249 * 3250 * Duplicate a packet out one or more interfaces that are in span mode, 3251 * the original mbuf is unmodified. 3252 */ 3253 static void 3254 bridge_span(struct bridge_softc *sc, struct mbuf *m) 3255 { 3256 struct bridge_iflist *bif; 3257 struct ifnet *dst_if; 3258 struct mbuf *mc; 3259 3260 NET_EPOCH_ASSERT(); 3261 3262 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 3263 return; 3264 3265 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 3266 dst_if = bif->bif_ifp; 3267 3268 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3269 continue; 3270 3271 mc = m_dup(m, M_NOWAIT); 3272 if (mc == NULL) { 3273 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3274 continue; 3275 } 3276 3277 bridge_enqueue(sc, dst_if, mc, bif); 3278 } 3279 } 3280 3281 /* 3282 * Incoming VLAN filtering. Given a frame and the member interface it was 3283 * received on, decide whether the port configuration allows it. 3284 */ 3285 static bool 3286 bridge_vfilter_in(const struct bridge_iflist *sbif, struct mbuf *m) 3287 { 3288 ether_vlanid_t vlan; 3289 3290 vlan = VLANTAGOF(m); 3291 /* Make sure the vlan id is reasonable. */ 3292 if (vlan > DOT1Q_VID_MAX) 3293 return (false); 3294 3295 /* 3296 * If VLAN filtering isn't enabled, pass everything, but add a tag 3297 * if the port has a pvid configured. 3298 */ 3299 if ((sbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) { 3300 if (vlan == DOT1Q_VID_NULL && 3301 sbif->bif_pvid != DOT1Q_VID_NULL) { 3302 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3303 m->m_flags |= M_VLANTAG; 3304 } 3305 3306 return (true); 3307 } 3308 3309 /* If Q-in-Q is disabled, check for stacked tags. */ 3310 if ((sbif->bif_flags & IFBIF_QINQ) == 0) { 3311 struct ether_header *eh; 3312 uint16_t proto; 3313 3314 eh = mtod(m, struct ether_header *); 3315 proto = ntohs(eh->ether_type); 3316 3317 if (proto == ETHERTYPE_VLAN || proto == ETHERTYPE_QINQ) 3318 return (false); 3319 } 3320 3321 if (vlan == DOT1Q_VID_NULL) { 3322 /* 3323 * The frame doesn't have a tag. If the interface does not 3324 * have an untagged vlan configured, drop the frame. 3325 */ 3326 if (sbif->bif_pvid == DOT1Q_VID_NULL) 3327 return (false); 3328 3329 /* 3330 * Otherwise, insert a new tag based on the interface's 3331 * untagged vlan id. 3332 */ 3333 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3334 m->m_flags |= M_VLANTAG; 3335 } else { 3336 /* 3337 * The frame has a tag, so check it matches the interface's 3338 * vlan access list. We explicitly do not accept tagged 3339 * frames for the untagged vlan id here (unless it's also 3340 * in the access list). 3341 */ 3342 if (!BRVLAN_TEST(&sbif->bif_vlan_set, vlan)) 3343 return (false); 3344 } 3345 3346 /* Accept the frame. */ 3347 return (true); 3348 } 3349 3350 /* 3351 * Outgoing VLAN filtering. Given a frame, its vlan, and the member interface 3352 * we intend to send it to, decide whether the port configuration allows it to 3353 * be sent. 3354 */ 3355 static bool 3356 bridge_vfilter_out(const struct bridge_iflist *dbif, const struct mbuf *m) 3357 { 3358 struct ether_header *eh; 3359 ether_vlanid_t vlan; 3360 3361 NET_EPOCH_ASSERT(); 3362 3363 /* 3364 * If the interface is in span mode, then bif_sc will be NULL. 3365 * Since the purpose of span interfaces is to receive all frames, 3366 * pass everything. 3367 */ 3368 if (dbif->bif_sc == NULL) 3369 return (true); 3370 3371 /* If VLAN filtering isn't enabled, pass everything. */ 3372 if ((dbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) 3373 return (true); 3374 3375 vlan = VLANTAGOF(m); 3376 3377 /* 3378 * Always allow untagged 802.1D STP frames, even if they would 3379 * otherwise be dropped. This is required for STP to work on 3380 * a filtering bridge. 3381 * 3382 * Tagged STP (Cisco PVST+) is a non-standard extension, so 3383 * handle those frames via the normal filtering path. 3384 */ 3385 eh = mtod(m, struct ether_header *); 3386 if (vlan == DOT1Q_VID_NULL && 3387 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) 3388 return (true); 3389 3390 /* 3391 * If the frame wasn't assigned to a vlan at ingress, drop it. 3392 * We can't forward these frames to filtering ports because we 3393 * don't know what VLAN they're supposed to be in. 3394 */ 3395 if (vlan == DOT1Q_VID_NULL) 3396 return (false); 3397 3398 /* 3399 * If the frame's vlan matches the interfaces's untagged vlan, 3400 * allow it. 3401 */ 3402 if (vlan == dbif->bif_pvid) 3403 return (true); 3404 3405 /* 3406 * If the frame's vlan is on the interface's tagged access list, 3407 * allow it. 3408 */ 3409 if (BRVLAN_TEST(&dbif->bif_vlan_set, vlan)) 3410 return (true); 3411 3412 /* The frame was not permitted, so drop it. */ 3413 return (false); 3414 } 3415 3416 /* 3417 * bridge_rtupdate: 3418 * 3419 * Add a bridge routing entry. 3420 */ 3421 static int 3422 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 3423 ether_vlanid_t vlan, struct bridge_iflist *bif, 3424 int setflags, uint8_t flags) 3425 { 3426 struct bridge_rtnode *brt; 3427 struct bridge_iflist *obif; 3428 int error; 3429 3430 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3431 3432 /* Check the source address is valid and not multicast. */ 3433 if (ETHER_IS_MULTICAST(dst)) 3434 return (EXTERROR(EINVAL, "Multicast address not permitted")); 3435 if (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 3436 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) 3437 return (EXTERROR(EINVAL, "Zero address not permitted")); 3438 3439 /* 3440 * A route for this destination might already exist. If so, 3441 * update it, otherwise create a new one. 3442 */ 3443 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 3444 BRIDGE_RT_LOCK(sc); 3445 3446 /* Check again, now that we have the lock. There could have 3447 * been a race and we only want to insert this once. */ 3448 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 3449 BRIDGE_RT_UNLOCK(sc); 3450 return (0); 3451 } 3452 3453 if (sc->sc_brtcnt >= sc->sc_brtmax) { 3454 sc->sc_brtexceeded++; 3455 BRIDGE_RT_UNLOCK(sc); 3456 return (EXTERROR(ENOSPC, "Address table is full")); 3457 } 3458 /* Check per interface address limits (if enabled) */ 3459 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 3460 bif->bif_addrexceeded++; 3461 BRIDGE_RT_UNLOCK(sc); 3462 return (EXTERROR(ENOSPC, 3463 "Interface address limit exceeded")); 3464 } 3465 3466 /* 3467 * Allocate a new bridge forwarding node, and 3468 * initialize the expiration time and Ethernet 3469 * address. 3470 */ 3471 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 3472 if (brt == NULL) { 3473 BRIDGE_RT_UNLOCK(sc); 3474 return (EXTERROR(ENOMEM, 3475 "Cannot allocate address node")); 3476 } 3477 brt->brt_vnet = curvnet; 3478 3479 if (bif->bif_flags & IFBIF_STICKY) 3480 brt->brt_flags = IFBAF_STICKY; 3481 else 3482 brt->brt_flags = IFBAF_DYNAMIC; 3483 3484 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 3485 brt->brt_vlan = vlan; 3486 3487 brt->brt_dst = bif; 3488 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 3489 uma_zfree(V_bridge_rtnode_zone, brt); 3490 BRIDGE_RT_UNLOCK(sc); 3491 return (error); 3492 } 3493 bif->bif_addrcnt++; 3494 3495 BRIDGE_RT_UNLOCK(sc); 3496 } 3497 3498 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 3499 (obif = brt->brt_dst) != bif) { 3500 MPASS(obif != NULL); 3501 3502 BRIDGE_RT_LOCK(sc); 3503 brt->brt_dst->bif_addrcnt--; 3504 brt->brt_dst = bif; 3505 brt->brt_dst->bif_addrcnt++; 3506 BRIDGE_RT_UNLOCK(sc); 3507 3508 if (V_log_mac_flap && 3509 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 3510 log(LOG_NOTICE, 3511 "%s: mac address %6D vlan %d moved from %s to %s\n", 3512 sc->sc_ifp->if_xname, 3513 &brt->brt_addr[0], ":", 3514 brt->brt_vlan, 3515 obif->bif_ifp->if_xname, 3516 bif->bif_ifp->if_xname); 3517 } 3518 } 3519 3520 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3521 brt->brt_expire = time_uptime + sc->sc_brttimeout; 3522 if (setflags) 3523 brt->brt_flags = flags; 3524 3525 return (0); 3526 } 3527 3528 /* 3529 * bridge_rtlookup: 3530 * 3531 * Lookup the destination interface for an address. 3532 */ 3533 static struct ifnet * 3534 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, 3535 ether_vlanid_t vlan) 3536 { 3537 struct bridge_rtnode *brt; 3538 3539 NET_EPOCH_ASSERT(); 3540 3541 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 3542 return (NULL); 3543 3544 return (brt->brt_ifp); 3545 } 3546 3547 /* 3548 * bridge_rttrim: 3549 * 3550 * Trim the routine table so that we have a number 3551 * of routing entries less than or equal to the 3552 * maximum number. 3553 */ 3554 static void 3555 bridge_rttrim(struct bridge_softc *sc) 3556 { 3557 struct bridge_rtnode *brt, *nbrt; 3558 3559 NET_EPOCH_ASSERT(); 3560 BRIDGE_RT_LOCK_ASSERT(sc); 3561 3562 /* Make sure we actually need to do this. */ 3563 if (sc->sc_brtcnt <= sc->sc_brtmax) 3564 return; 3565 3566 /* Force an aging cycle; this might trim enough addresses. */ 3567 bridge_rtage(sc); 3568 if (sc->sc_brtcnt <= sc->sc_brtmax) 3569 return; 3570 3571 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3572 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3573 bridge_rtnode_destroy(sc, brt); 3574 if (sc->sc_brtcnt <= sc->sc_brtmax) 3575 return; 3576 } 3577 } 3578 } 3579 3580 /* 3581 * bridge_timer: 3582 * 3583 * Aging timer for the bridge. 3584 */ 3585 static void 3586 bridge_timer(void *arg) 3587 { 3588 struct bridge_softc *sc = arg; 3589 3590 BRIDGE_RT_LOCK_ASSERT(sc); 3591 3592 /* Destruction of rtnodes requires a proper vnet context */ 3593 CURVNET_SET(sc->sc_ifp->if_vnet); 3594 bridge_rtage(sc); 3595 3596 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3597 callout_reset(&sc->sc_brcallout, 3598 bridge_rtable_prune_period * hz, bridge_timer, sc); 3599 CURVNET_RESTORE(); 3600 } 3601 3602 /* 3603 * bridge_rtage: 3604 * 3605 * Perform an aging cycle. 3606 */ 3607 static void 3608 bridge_rtage(struct bridge_softc *sc) 3609 { 3610 struct bridge_rtnode *brt, *nbrt; 3611 3612 BRIDGE_RT_LOCK_ASSERT(sc); 3613 3614 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3615 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3616 if (time_uptime >= brt->brt_expire) 3617 bridge_rtnode_destroy(sc, brt); 3618 } 3619 } 3620 } 3621 3622 /* 3623 * bridge_rtflush: 3624 * 3625 * Remove all dynamic addresses from the bridge. 3626 */ 3627 static void 3628 bridge_rtflush(struct bridge_softc *sc, int full) 3629 { 3630 struct bridge_rtnode *brt, *nbrt; 3631 3632 BRIDGE_RT_LOCK_ASSERT(sc); 3633 3634 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3635 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3636 bridge_rtnode_destroy(sc, brt); 3637 } 3638 } 3639 3640 /* 3641 * bridge_rtdaddr: 3642 * 3643 * Remove an address from the table. 3644 */ 3645 static int 3646 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, 3647 ether_vlanid_t vlan) 3648 { 3649 struct bridge_rtnode *brt; 3650 int found = 0; 3651 3652 BRIDGE_RT_LOCK(sc); 3653 3654 /* 3655 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans 3656 * so the lookup may return more than one. 3657 */ 3658 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3659 bridge_rtnode_destroy(sc, brt); 3660 found = 1; 3661 } 3662 3663 BRIDGE_RT_UNLOCK(sc); 3664 3665 return (found ? 0 : ENOENT); 3666 } 3667 3668 /* 3669 * bridge_rtdelete: 3670 * 3671 * Delete routes to a speicifc member interface. 3672 */ 3673 static void 3674 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3675 { 3676 struct bridge_rtnode *brt, *nbrt; 3677 3678 BRIDGE_RT_LOCK_ASSERT(sc); 3679 3680 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3681 if (brt->brt_ifp == ifp && (full || 3682 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3683 bridge_rtnode_destroy(sc, brt); 3684 } 3685 } 3686 3687 /* 3688 * bridge_rtable_init: 3689 * 3690 * Initialize the route table for this bridge. 3691 */ 3692 static void 3693 bridge_rtable_init(struct bridge_softc *sc) 3694 { 3695 int i; 3696 3697 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3698 M_DEVBUF, M_WAITOK); 3699 3700 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3701 CK_LIST_INIT(&sc->sc_rthash[i]); 3702 3703 sc->sc_rthash_key = arc4random(); 3704 CK_LIST_INIT(&sc->sc_rtlist); 3705 } 3706 3707 /* 3708 * bridge_rtable_fini: 3709 * 3710 * Deconstruct the route table for this bridge. 3711 */ 3712 static void 3713 bridge_rtable_fini(struct bridge_softc *sc) 3714 { 3715 3716 KASSERT(sc->sc_brtcnt == 0, 3717 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3718 free(sc->sc_rthash, M_DEVBUF); 3719 } 3720 3721 /* 3722 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3723 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3724 */ 3725 #define mix(a, b, c) \ 3726 do { \ 3727 a -= b; a -= c; a ^= (c >> 13); \ 3728 b -= c; b -= a; b ^= (a << 8); \ 3729 c -= a; c -= b; c ^= (b >> 13); \ 3730 a -= b; a -= c; a ^= (c >> 12); \ 3731 b -= c; b -= a; b ^= (a << 16); \ 3732 c -= a; c -= b; c ^= (b >> 5); \ 3733 a -= b; a -= c; a ^= (c >> 3); \ 3734 b -= c; b -= a; b ^= (a << 10); \ 3735 c -= a; c -= b; c ^= (b >> 15); \ 3736 } while (/*CONSTCOND*/0) 3737 3738 static __inline uint32_t 3739 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3740 { 3741 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3742 3743 b += addr[5] << 8; 3744 b += addr[4]; 3745 a += addr[3] << 24; 3746 a += addr[2] << 16; 3747 a += addr[1] << 8; 3748 a += addr[0]; 3749 3750 mix(a, b, c); 3751 3752 return (c & BRIDGE_RTHASH_MASK); 3753 } 3754 3755 #undef mix 3756 3757 static int 3758 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3759 { 3760 int i, d; 3761 3762 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3763 d = ((int)a[i]) - ((int)b[i]); 3764 } 3765 3766 return (d); 3767 } 3768 3769 /* 3770 * bridge_rtnode_lookup: 3771 * 3772 * Look up a bridge route node for the specified destination. Compare the 3773 * vlan id or if zero then just return the first match. 3774 */ 3775 static struct bridge_rtnode * 3776 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, 3777 ether_vlanid_t vlan) 3778 { 3779 struct bridge_rtnode *brt; 3780 uint32_t hash; 3781 int dir; 3782 3783 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3784 3785 hash = bridge_rthash(sc, addr); 3786 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3787 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3788 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL)) 3789 return (brt); 3790 if (dir > 0) 3791 return (NULL); 3792 } 3793 3794 return (NULL); 3795 } 3796 3797 /* 3798 * bridge_rtnode_insert: 3799 * 3800 * Insert the specified bridge node into the route table. We 3801 * assume the entry is not already in the table. 3802 */ 3803 static int 3804 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3805 { 3806 struct bridge_rtnode *lbrt; 3807 uint32_t hash; 3808 int dir; 3809 3810 BRIDGE_RT_LOCK_ASSERT(sc); 3811 3812 hash = bridge_rthash(sc, brt->brt_addr); 3813 3814 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3815 if (lbrt == NULL) { 3816 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3817 goto out; 3818 } 3819 3820 do { 3821 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3822 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3823 return (EXTERROR(EEXIST, "Address already exists")); 3824 if (dir > 0) { 3825 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3826 goto out; 3827 } 3828 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3829 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3830 goto out; 3831 } 3832 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3833 } while (lbrt != NULL); 3834 3835 #ifdef DIAGNOSTIC 3836 panic("bridge_rtnode_insert: impossible"); 3837 #endif 3838 3839 out: 3840 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3841 sc->sc_brtcnt++; 3842 3843 return (0); 3844 } 3845 3846 static void 3847 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3848 { 3849 struct bridge_rtnode *brt; 3850 3851 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3852 3853 CURVNET_SET(brt->brt_vnet); 3854 uma_zfree(V_bridge_rtnode_zone, brt); 3855 CURVNET_RESTORE(); 3856 } 3857 3858 /* 3859 * bridge_rtnode_destroy: 3860 * 3861 * Destroy a bridge rtnode. 3862 */ 3863 static void 3864 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3865 { 3866 BRIDGE_RT_LOCK_ASSERT(sc); 3867 3868 CK_LIST_REMOVE(brt, brt_hash); 3869 3870 CK_LIST_REMOVE(brt, brt_list); 3871 sc->sc_brtcnt--; 3872 brt->brt_dst->bif_addrcnt--; 3873 3874 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3875 } 3876 3877 /* 3878 * bridge_rtable_expire: 3879 * 3880 * Set the expiry time for all routes on an interface. 3881 */ 3882 static void 3883 bridge_rtable_expire(struct ifnet *ifp, int age) 3884 { 3885 struct bridge_iflist *bif = NULL; 3886 struct bridge_softc *sc = NULL; 3887 struct bridge_rtnode *brt; 3888 3889 CURVNET_SET(ifp->if_vnet); 3890 3891 bif = ifp->if_bridge; 3892 if (bif) 3893 sc = bif->bif_sc; 3894 MPASS(sc != NULL); 3895 BRIDGE_RT_LOCK(sc); 3896 3897 /* 3898 * If the age is zero then flush, otherwise set all the expiry times to 3899 * age for the interface 3900 */ 3901 if (age == 0) 3902 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3903 else { 3904 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3905 /* Cap the expiry time to 'age' */ 3906 if (brt->brt_ifp == ifp && 3907 brt->brt_expire > time_uptime + age && 3908 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3909 brt->brt_expire = time_uptime + age; 3910 } 3911 } 3912 BRIDGE_RT_UNLOCK(sc); 3913 CURVNET_RESTORE(); 3914 } 3915 3916 /* 3917 * bridge_state_change: 3918 * 3919 * Callback from the bridgestp code when a port changes states. 3920 */ 3921 static void 3922 bridge_state_change(struct ifnet *ifp, int state) 3923 { 3924 struct bridge_iflist *bif = ifp->if_bridge; 3925 struct bridge_softc *sc = bif->bif_sc; 3926 static const char *stpstates[] = { 3927 "disabled", 3928 "listening", 3929 "learning", 3930 "forwarding", 3931 "blocking", 3932 "discarding" 3933 }; 3934 3935 CURVNET_SET(ifp->if_vnet); 3936 if (V_log_stp) 3937 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3938 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3939 CURVNET_RESTORE(); 3940 } 3941 3942 /* 3943 * Send bridge packets through pfil if they are one of the types pfil can deal 3944 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3945 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3946 * that interface. 3947 */ 3948 static int 3949 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3950 { 3951 int snap, error, i; 3952 struct ether_header *eh1, eh2; 3953 struct llc llc1; 3954 u_int16_t ether_type; 3955 pfil_return_t rv; 3956 #ifdef INET 3957 struct ip *ip = NULL; 3958 int hlen = 0; 3959 #endif 3960 3961 snap = 0; 3962 error = -1; /* Default error if not error == 0 */ 3963 3964 #if 0 3965 /* we may return with the IP fields swapped, ensure its not shared */ 3966 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3967 #endif 3968 3969 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3970 return (0); /* filtering is disabled */ 3971 3972 i = min((*mp)->m_pkthdr.len, max_protohdr); 3973 if ((*mp)->m_len < i) { 3974 *mp = m_pullup(*mp, i); 3975 if (*mp == NULL) { 3976 printf("%s: m_pullup failed\n", __func__); 3977 return (-1); 3978 } 3979 } 3980 3981 eh1 = mtod(*mp, struct ether_header *); 3982 ether_type = ntohs(eh1->ether_type); 3983 3984 /* 3985 * Check for SNAP/LLC. 3986 */ 3987 if (ether_type < ETHERMTU) { 3988 struct llc *llc2 = (struct llc *)(eh1 + 1); 3989 3990 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3991 llc2->llc_dsap == LLC_SNAP_LSAP && 3992 llc2->llc_ssap == LLC_SNAP_LSAP && 3993 llc2->llc_control == LLC_UI) { 3994 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3995 snap = 1; 3996 } 3997 } 3998 3999 /* 4000 * If we're trying to filter bridge traffic, only look at traffic for 4001 * protocols available in the kernel (IPv4 and/or IPv6) to avoid 4002 * passing traffic for an unsupported protocol to the filter. This is 4003 * lame since if we really wanted, say, an AppleTalk filter, we are 4004 * hosed, but of course we don't have an AppleTalk filter to begin 4005 * with. (Note that since pfil doesn't understand ARP it will pass 4006 * *ALL* ARP traffic.) 4007 */ 4008 switch (ether_type) { 4009 #ifdef INET 4010 case ETHERTYPE_ARP: 4011 case ETHERTYPE_REVARP: 4012 if (V_pfil_ipfw_arp == 0) 4013 return (0); /* Automatically pass */ 4014 4015 /* FALLTHROUGH */ 4016 case ETHERTYPE_IP: 4017 #endif 4018 #ifdef INET6 4019 case ETHERTYPE_IPV6: 4020 #endif /* INET6 */ 4021 break; 4022 4023 default: 4024 /* 4025 * We get here if the packet isn't from a supported 4026 * protocol. Check to see if the user wants to pass 4027 * non-IP packets, these will not be checked by pfil(9) 4028 * and passed unconditionally so the default is to 4029 * drop. 4030 */ 4031 if (V_pfil_onlyip) 4032 goto bad; 4033 } 4034 4035 /* Run the packet through pfil before stripping link headers */ 4036 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 4037 dir == PFIL_OUT && ifp != NULL) { 4038 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 4039 case PFIL_DROPPED: 4040 return (EACCES); 4041 case PFIL_CONSUMED: 4042 return (0); 4043 } 4044 } 4045 4046 /* Strip off the Ethernet header and keep a copy. */ 4047 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 4048 m_adj(*mp, ETHER_HDR_LEN); 4049 4050 /* Strip off snap header, if present */ 4051 if (snap) { 4052 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 4053 m_adj(*mp, sizeof(struct llc)); 4054 } 4055 4056 /* 4057 * Check the IP header for alignment and errors 4058 */ 4059 if (dir == PFIL_IN) { 4060 switch (ether_type) { 4061 #ifdef INET 4062 case ETHERTYPE_IP: 4063 error = bridge_ip_checkbasic(mp); 4064 break; 4065 #endif 4066 #ifdef INET6 4067 case ETHERTYPE_IPV6: 4068 error = bridge_ip6_checkbasic(mp); 4069 break; 4070 #endif /* INET6 */ 4071 default: 4072 error = 0; 4073 } 4074 if (error) 4075 goto bad; 4076 } 4077 4078 error = 0; 4079 4080 /* 4081 * Run the packet through pfil 4082 */ 4083 rv = PFIL_PASS; 4084 switch (ether_type) { 4085 #ifdef INET 4086 case ETHERTYPE_IP: 4087 /* 4088 * Run pfil on the member interface and the bridge, both can 4089 * be skipped by clearing pfil_member or pfil_bridge. 4090 * 4091 * Keep the order: 4092 * in_if -> bridge_if -> out_if 4093 */ 4094 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4095 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 4096 PFIL_PASS) 4097 break; 4098 4099 if (V_pfil_member && ifp != NULL) { 4100 rv = (dir == PFIL_OUT) ? 4101 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 4102 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 4103 if (rv != PFIL_PASS) 4104 break; 4105 } 4106 4107 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4108 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 4109 PFIL_PASS) 4110 break; 4111 4112 /* check if we need to fragment the packet */ 4113 /* bridge_fragment generates a mbuf chain of packets */ 4114 /* that already include eth headers */ 4115 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 4116 i = (*mp)->m_pkthdr.len; 4117 if (i > ifp->if_mtu) { 4118 error = bridge_fragment(ifp, mp, &eh2, snap, 4119 &llc1); 4120 return (error); 4121 } 4122 } 4123 4124 /* Recalculate the ip checksum. */ 4125 ip = mtod(*mp, struct ip *); 4126 hlen = ip->ip_hl << 2; 4127 if (hlen < sizeof(struct ip)) 4128 goto bad; 4129 if (hlen > (*mp)->m_len) { 4130 if ((*mp = m_pullup(*mp, hlen)) == NULL) 4131 goto bad; 4132 ip = mtod(*mp, struct ip *); 4133 if (ip == NULL) 4134 goto bad; 4135 } 4136 ip->ip_sum = 0; 4137 if (hlen == sizeof(struct ip)) 4138 ip->ip_sum = in_cksum_hdr(ip); 4139 else 4140 ip->ip_sum = in_cksum(*mp, hlen); 4141 4142 break; 4143 #endif /* INET */ 4144 #ifdef INET6 4145 case ETHERTYPE_IPV6: 4146 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4147 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 4148 PFIL_PASS) 4149 break; 4150 4151 if (V_pfil_member && ifp != NULL) { 4152 rv = (dir == PFIL_OUT) ? 4153 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 4154 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 4155 if (rv != PFIL_PASS) 4156 break; 4157 } 4158 4159 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4160 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 4161 PFIL_PASS) 4162 break; 4163 break; 4164 #endif 4165 } 4166 4167 switch (rv) { 4168 case PFIL_CONSUMED: 4169 return (0); 4170 case PFIL_DROPPED: 4171 return (EACCES); 4172 default: 4173 break; 4174 } 4175 4176 error = -1; 4177 4178 /* 4179 * Finally, put everything back the way it was and return 4180 */ 4181 if (snap) { 4182 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 4183 if (*mp == NULL) 4184 return (error); 4185 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 4186 } 4187 4188 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 4189 if (*mp == NULL) 4190 return (error); 4191 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 4192 4193 return (0); 4194 4195 bad: 4196 m_freem(*mp); 4197 *mp = NULL; 4198 return (error); 4199 } 4200 4201 #ifdef INET 4202 /* 4203 * Perform basic checks on header size since 4204 * pfil assumes ip_input has already processed 4205 * it for it. Cut-and-pasted from ip_input.c. 4206 * Given how simple the IPv6 version is, 4207 * does the IPv4 version really need to be 4208 * this complicated? 4209 * 4210 * XXX Should we update ipstat here, or not? 4211 * XXX Right now we update ipstat but not 4212 * XXX csum_counter. 4213 */ 4214 static int 4215 bridge_ip_checkbasic(struct mbuf **mp) 4216 { 4217 struct mbuf *m = *mp; 4218 struct ip *ip; 4219 int len, hlen; 4220 u_short sum; 4221 4222 if (*mp == NULL) 4223 return (-1); 4224 4225 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4226 if ((m = m_copyup(m, sizeof(struct ip), 4227 (max_linkhdr + 3) & ~3)) == NULL) { 4228 /* XXXJRT new stat, please */ 4229 KMOD_IPSTAT_INC(ips_toosmall); 4230 goto bad; 4231 } 4232 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 4233 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 4234 KMOD_IPSTAT_INC(ips_toosmall); 4235 goto bad; 4236 } 4237 } 4238 ip = mtod(m, struct ip *); 4239 if (ip == NULL) goto bad; 4240 4241 if (ip->ip_v != IPVERSION) { 4242 KMOD_IPSTAT_INC(ips_badvers); 4243 goto bad; 4244 } 4245 hlen = ip->ip_hl << 2; 4246 if (hlen < sizeof(struct ip)) { /* minimum header length */ 4247 KMOD_IPSTAT_INC(ips_badhlen); 4248 goto bad; 4249 } 4250 if (hlen > m->m_len) { 4251 if ((m = m_pullup(m, hlen)) == NULL) { 4252 KMOD_IPSTAT_INC(ips_badhlen); 4253 goto bad; 4254 } 4255 ip = mtod(m, struct ip *); 4256 if (ip == NULL) goto bad; 4257 } 4258 4259 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 4260 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 4261 } else { 4262 if (hlen == sizeof(struct ip)) { 4263 sum = in_cksum_hdr(ip); 4264 } else { 4265 sum = in_cksum(m, hlen); 4266 } 4267 } 4268 if (sum) { 4269 KMOD_IPSTAT_INC(ips_badsum); 4270 goto bad; 4271 } 4272 4273 /* Retrieve the packet length. */ 4274 len = ntohs(ip->ip_len); 4275 4276 /* 4277 * Check for additional length bogosity 4278 */ 4279 if (len < hlen) { 4280 KMOD_IPSTAT_INC(ips_badlen); 4281 goto bad; 4282 } 4283 4284 /* 4285 * Check that the amount of data in the buffers 4286 * is as at least much as the IP header would have us expect. 4287 * Drop packet if shorter than we expect. 4288 */ 4289 if (m->m_pkthdr.len < len) { 4290 KMOD_IPSTAT_INC(ips_tooshort); 4291 goto bad; 4292 } 4293 4294 /* Checks out, proceed */ 4295 *mp = m; 4296 return (0); 4297 4298 bad: 4299 *mp = m; 4300 return (-1); 4301 } 4302 #endif /* INET */ 4303 4304 #ifdef INET6 4305 /* 4306 * Same as above, but for IPv6. 4307 * Cut-and-pasted from ip6_input.c. 4308 * XXX Should we update ip6stat, or not? 4309 */ 4310 static int 4311 bridge_ip6_checkbasic(struct mbuf **mp) 4312 { 4313 struct mbuf *m = *mp; 4314 struct ip6_hdr *ip6; 4315 4316 /* 4317 * If the IPv6 header is not aligned, slurp it up into a new 4318 * mbuf with space for link headers, in the event we forward 4319 * it. Otherwise, if it is aligned, make sure the entire base 4320 * IPv6 header is in the first mbuf of the chain. 4321 */ 4322 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4323 struct ifnet *inifp = m->m_pkthdr.rcvif; 4324 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 4325 (max_linkhdr + 3) & ~3)) == NULL) { 4326 /* XXXJRT new stat, please */ 4327 IP6STAT_INC(ip6s_toosmall); 4328 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4329 goto bad; 4330 } 4331 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 4332 struct ifnet *inifp = m->m_pkthdr.rcvif; 4333 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 4334 IP6STAT_INC(ip6s_toosmall); 4335 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4336 goto bad; 4337 } 4338 } 4339 4340 ip6 = mtod(m, struct ip6_hdr *); 4341 4342 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 4343 IP6STAT_INC(ip6s_badvers); 4344 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 4345 goto bad; 4346 } 4347 4348 /* Checks out, proceed */ 4349 *mp = m; 4350 return (0); 4351 4352 bad: 4353 *mp = m; 4354 return (-1); 4355 } 4356 #endif /* INET6 */ 4357 4358 #ifdef INET 4359 /* 4360 * bridge_fragment: 4361 * 4362 * Fragment mbuf chain in multiple packets and prepend ethernet header. 4363 */ 4364 static int 4365 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 4366 int snap, struct llc *llc) 4367 { 4368 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 4369 struct ip *ip; 4370 int error = -1; 4371 4372 if (m->m_len < sizeof(struct ip) && 4373 (m = m_pullup(m, sizeof(struct ip))) == NULL) 4374 goto dropit; 4375 ip = mtod(m, struct ip *); 4376 4377 m->m_pkthdr.csum_flags |= CSUM_IP; 4378 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 4379 if (error) 4380 goto dropit; 4381 4382 /* 4383 * Walk the chain and re-add the Ethernet header for 4384 * each mbuf packet. 4385 */ 4386 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 4387 nextpkt = mcur->m_nextpkt; 4388 mcur->m_nextpkt = NULL; 4389 if (snap) { 4390 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 4391 if (mcur == NULL) { 4392 error = ENOBUFS; 4393 if (mprev != NULL) 4394 mprev->m_nextpkt = nextpkt; 4395 goto dropit; 4396 } 4397 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 4398 } 4399 4400 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 4401 if (mcur == NULL) { 4402 error = ENOBUFS; 4403 if (mprev != NULL) 4404 mprev->m_nextpkt = nextpkt; 4405 goto dropit; 4406 } 4407 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 4408 4409 /* 4410 * The previous two M_PREPEND could have inserted one or two 4411 * mbufs in front so we have to update the previous packet's 4412 * m_nextpkt. 4413 */ 4414 mcur->m_nextpkt = nextpkt; 4415 if (mprev != NULL) 4416 mprev->m_nextpkt = mcur; 4417 else { 4418 /* The first mbuf in the original chain needs to be 4419 * updated. */ 4420 *mp = mcur; 4421 } 4422 mprev = mcur; 4423 } 4424 4425 KMOD_IPSTAT_INC(ips_fragmented); 4426 return (error); 4427 4428 dropit: 4429 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 4430 m = mcur->m_nextpkt; 4431 m_freem(mcur); 4432 } 4433 return (error); 4434 } 4435 #endif /* INET */ 4436 4437 static void 4438 bridge_linkstate(struct ifnet *ifp) 4439 { 4440 struct bridge_softc *sc = NULL; 4441 struct bridge_iflist *bif; 4442 struct epoch_tracker et; 4443 4444 NET_EPOCH_ENTER(et); 4445 4446 bif = ifp->if_bridge; 4447 if (bif) 4448 sc = bif->bif_sc; 4449 4450 if (sc != NULL) { 4451 bridge_linkcheck(sc); 4452 bstp_linkstate(&bif->bif_stp); 4453 } 4454 4455 NET_EPOCH_EXIT(et); 4456 } 4457 4458 static void 4459 bridge_linkcheck(struct bridge_softc *sc) 4460 { 4461 struct bridge_iflist *bif; 4462 int new_link, hasls; 4463 4464 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 4465 4466 new_link = LINK_STATE_DOWN; 4467 hasls = 0; 4468 /* Our link is considered up if at least one of our ports is active */ 4469 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 4470 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 4471 hasls++; 4472 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 4473 new_link = LINK_STATE_UP; 4474 break; 4475 } 4476 } 4477 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 4478 /* If no interfaces support link-state then we default to up */ 4479 new_link = LINK_STATE_UP; 4480 } 4481 if_link_state_change(sc->sc_ifp, new_link); 4482 } 4483