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