1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include "opt_inet.h" 80 #include "opt_inet6.h" 81 82 #define EXTERR_CATEGORY EXTERR_CAT_BRIDGE 83 84 #include <sys/param.h> 85 #include <sys/ctype.h> /* string functions */ 86 #include <sys/eventhandler.h> 87 #include <sys/exterrvar.h> 88 #include <sys/jail.h> 89 #include <sys/kernel.h> 90 #include <sys/lock.h> 91 #include <sys/malloc.h> 92 #include <sys/mbuf.h> 93 #include <sys/module.h> 94 #include <sys/mutex.h> 95 #include <sys/priv.h> 96 #include <sys/proc.h> 97 #include <sys/protosw.h> 98 #include <sys/random.h> 99 #include <sys/systm.h> 100 #include <sys/socket.h> /* for net/if.h */ 101 #include <sys/sockio.h> 102 #include <sys/syslog.h> 103 #include <sys/sysctl.h> 104 #include <sys/time.h> 105 106 #include <vm/uma.h> 107 108 #include <net/bpf.h> 109 #include <net/if.h> 110 #include <net/if_clone.h> 111 #include <net/if_dl.h> 112 #include <net/if_types.h> 113 #include <net/if_var.h> 114 #include <net/if_private.h> 115 #include <net/pfil.h> 116 #include <net/vnet.h> 117 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/in_var.h> 121 #include <netinet/ip.h> 122 #include <netinet/ip_var.h> 123 #ifdef INET6 124 #include <netinet/ip6.h> 125 #include <netinet6/ip6_var.h> 126 #include <netinet6/in6_ifattach.h> 127 #endif 128 #if defined(INET) || defined(INET6) 129 #include <netinet/ip_carp.h> 130 #endif 131 #include <machine/in_cksum.h> 132 #include <netinet/if_ether.h> 133 #include <net/bridgestp.h> 134 #include <net/if_bridgevar.h> 135 #include <net/if_llc.h> 136 #include <net/if_vlan_var.h> 137 138 #include <net/route.h> 139 140 /* 141 * At various points in the code we need to know if we're hooked into the INET 142 * and/or INET6 pfil. Define some macros to do that based on which IP versions 143 * are enabled in the kernel. This avoids littering the rest of the code with 144 * #ifnet INET6 to avoid referencing V_inet6_pfil_head. 145 */ 146 #ifdef INET6 147 #define PFIL_HOOKED_IN_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 148 #define PFIL_HOOKED_OUT_INET6 PFIL_HOOKED_OUT(V_inet6_pfil_head) 149 #else 150 #define PFIL_HOOKED_IN_INET6 false 151 #define PFIL_HOOKED_OUT_INET6 false 152 #endif 153 154 #ifdef INET 155 #define PFIL_HOOKED_IN_INET PFIL_HOOKED_IN(V_inet_pfil_head) 156 #define PFIL_HOOKED_OUT_INET PFIL_HOOKED_OUT(V_inet_pfil_head) 157 #else 158 #define PFIL_HOOKED_IN_INET false 159 #define PFIL_HOOKED_OUT_INET false 160 #endif 161 162 #define PFIL_HOOKED_IN_46 (PFIL_HOOKED_IN_INET6 || PFIL_HOOKED_IN_INET) 163 #define PFIL_HOOKED_OUT_46 (PFIL_HOOKED_OUT_INET6 || PFIL_HOOKED_OUT_INET) 164 165 /* 166 * Size of the route hash table. Must be a power of two. 167 */ 168 #ifndef BRIDGE_RTHASH_SIZE 169 #define BRIDGE_RTHASH_SIZE 1024 170 #endif 171 172 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 173 174 /* 175 * Default maximum number of addresses to cache. 176 */ 177 #ifndef BRIDGE_RTABLE_MAX 178 #define BRIDGE_RTABLE_MAX 2000 179 #endif 180 181 /* 182 * Timeout (in seconds) for entries learned dynamically. 183 */ 184 #ifndef BRIDGE_RTABLE_TIMEOUT 185 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 186 #endif 187 188 /* 189 * Number of seconds between walks of the route list. 190 */ 191 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 192 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 193 #endif 194 195 /* 196 * List of capabilities to possibly mask on the member interface. 197 */ 198 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 199 IFCAP_TXCSUM_IPV6|IFCAP_MEXTPG) 200 201 /* 202 * List of capabilities to strip 203 */ 204 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 205 206 /* 207 * Bridge locking 208 * 209 * The bridge relies heavily on the epoch(9) system to protect its data 210 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 211 * must ensure there is only one writer at a time. 212 * 213 * That is: for read accesses we only need to be in NET_EPOCH, but for write 214 * accesses we must hold: 215 * 216 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 217 * - BRIDGE_LOCK, for any other change 218 * 219 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 220 * calls to bridge member interfaces and these ioctl()s can sleep. 221 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 222 * required while we're in NET_EPOCH and then we're not allowed to sleep. 223 */ 224 #define BRIDGE_LOCK_INIT(_sc) do { \ 225 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 226 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 227 } while (0) 228 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 229 sx_destroy(&(_sc)->sc_sx); \ 230 mtx_destroy(&(_sc)->sc_rt_mtx); \ 231 } while (0) 232 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 233 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 234 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 235 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 236 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 237 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 238 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 239 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 240 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 241 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 242 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 243 244 struct bridge_softc; 245 246 /* 247 * Bridge interface list entry. 248 */ 249 struct bridge_iflist { 250 CK_LIST_ENTRY(bridge_iflist) bif_next; 251 struct ifnet *bif_ifp; /* member if */ 252 struct bridge_softc *bif_sc; /* parent bridge */ 253 struct bstp_port bif_stp; /* STP state */ 254 uint32_t bif_flags; /* member if flags */ 255 int bif_savedcaps; /* saved capabilities */ 256 uint32_t bif_addrmax; /* max # of addresses */ 257 uint32_t bif_addrcnt; /* cur. # of addresses */ 258 uint32_t bif_addrexceeded;/* # of address violations */ 259 struct epoch_context bif_epoch_ctx; 260 ether_vlanid_t bif_pvid; /* port vlan id */ 261 ifbvlan_set_t bif_vlan_set; /* if allowed tagged vlans */ 262 uint16_t bif_vlanproto; /* vlan protocol */ 263 }; 264 265 /* 266 * Bridge route node. 267 */ 268 struct bridge_rtnode { 269 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 270 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 271 struct bridge_iflist *brt_dst; /* destination if */ 272 unsigned long brt_expire; /* expiration time */ 273 uint8_t brt_flags; /* address flags */ 274 uint8_t brt_addr[ETHER_ADDR_LEN]; 275 ether_vlanid_t brt_vlan; /* vlan id */ 276 struct vnet *brt_vnet; 277 struct epoch_context brt_epoch_ctx; 278 }; 279 #define brt_ifp brt_dst->bif_ifp 280 281 /* 282 * Software state for each bridge. 283 */ 284 struct bridge_softc { 285 struct ifnet *sc_ifp; /* make this an interface */ 286 LIST_ENTRY(bridge_softc) sc_list; 287 struct sx sc_sx; 288 struct mtx sc_rt_mtx; 289 uint32_t sc_brtmax; /* max # of addresses */ 290 uint32_t sc_brtcnt; /* cur. # of addresses */ 291 uint32_t sc_brttimeout; /* rt timeout in seconds */ 292 struct callout sc_brcallout; /* bridge callout */ 293 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 294 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 295 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 296 uint32_t sc_rthash_key; /* key for hash */ 297 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 298 struct bstp_state sc_stp; /* STP state */ 299 uint32_t sc_brtexceeded; /* # of cache drops */ 300 struct ifnet *sc_ifaddr; /* member mac copied from */ 301 struct ether_addr sc_defaddr; /* Default MAC address */ 302 if_input_fn_t sc_if_input; /* Saved copy of if_input */ 303 struct epoch_context sc_epoch_ctx; 304 ifbr_flags_t sc_flags; /* bridge flags */ 305 ether_vlanid_t sc_defpvid; /* default PVID */ 306 }; 307 308 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 309 #define V_bridge_list_sx VNET(bridge_list_sx) 310 static eventhandler_tag bridge_detach_cookie; 311 312 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 313 314 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 315 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 316 317 static int bridge_clone_create(struct if_clone *, char *, size_t, 318 struct ifc_data *, struct ifnet **); 319 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 320 321 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 322 static void bridge_mutecaps(struct bridge_softc *); 323 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 324 int); 325 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 326 static void bridge_init(void *); 327 static void bridge_dummynet(struct mbuf *, struct ifnet *); 328 static bool bridge_same(const void *, const void *); 329 static void *bridge_get_softc(struct ifnet *); 330 static void bridge_stop(struct ifnet *, int); 331 static int bridge_transmit(struct ifnet *, struct mbuf *); 332 #ifdef ALTQ 333 static void bridge_altq_start(if_t); 334 static int bridge_altq_transmit(if_t, struct mbuf *); 335 #endif 336 static void bridge_qflush(struct ifnet *); 337 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 338 static void bridge_inject(struct ifnet *, struct mbuf *); 339 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 340 struct rtentry *); 341 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 342 struct mbuf *, struct bridge_iflist *); 343 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 344 345 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 346 struct mbuf *m); 347 static bool bridge_member_ifaddrs(void); 348 static void bridge_timer(void *); 349 350 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 351 struct mbuf *, int); 352 static void bridge_span(struct bridge_softc *, struct mbuf *); 353 354 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 355 ether_vlanid_t, struct bridge_iflist *, int, uint8_t); 356 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 357 ether_vlanid_t); 358 static void bridge_rttrim(struct bridge_softc *); 359 static void bridge_rtage(struct bridge_softc *); 360 static void bridge_rtflush(struct bridge_softc *, int); 361 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 362 ether_vlanid_t); 363 static bool bridge_vfilter_in(const struct bridge_iflist *, struct mbuf *); 364 static bool bridge_vfilter_out(const struct bridge_iflist *, 365 const struct mbuf *); 366 367 static void bridge_rtable_init(struct bridge_softc *); 368 static void bridge_rtable_fini(struct bridge_softc *); 369 370 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 371 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 372 const uint8_t *, ether_vlanid_t); 373 static int bridge_rtnode_insert(struct bridge_softc *, 374 struct bridge_rtnode *); 375 static void bridge_rtnode_destroy(struct bridge_softc *, 376 struct bridge_rtnode *); 377 static void bridge_rtable_expire(struct ifnet *, int); 378 static void bridge_state_change(struct ifnet *, int); 379 380 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 381 const char *name); 382 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 383 struct ifnet *ifp); 384 static void bridge_delete_member(struct bridge_softc *, 385 struct bridge_iflist *, int); 386 static void bridge_delete_span(struct bridge_softc *, 387 struct bridge_iflist *); 388 389 static int bridge_ioctl_add(struct bridge_softc *, void *); 390 static int bridge_ioctl_del(struct bridge_softc *, void *); 391 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 392 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 393 static int bridge_ioctl_scache(struct bridge_softc *, void *); 394 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 395 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 396 static int bridge_ioctl_rts(struct bridge_softc *, void *); 397 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 398 static int bridge_ioctl_sto(struct bridge_softc *, void *); 399 static int bridge_ioctl_gto(struct bridge_softc *, void *); 400 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 401 static int bridge_ioctl_flush(struct bridge_softc *, void *); 402 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 403 static int bridge_ioctl_spri(struct bridge_softc *, void *); 404 static int bridge_ioctl_ght(struct bridge_softc *, void *); 405 static int bridge_ioctl_sht(struct bridge_softc *, void *); 406 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 407 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 408 static int bridge_ioctl_gma(struct bridge_softc *, void *); 409 static int bridge_ioctl_sma(struct bridge_softc *, void *); 410 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 411 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 412 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 413 static int bridge_ioctl_sifpvid(struct bridge_softc *, void *); 414 static int bridge_ioctl_sifvlanset(struct bridge_softc *, void *); 415 static int bridge_ioctl_gifvlanset(struct bridge_softc *, void *); 416 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 417 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 418 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 419 static int bridge_ioctl_grte(struct bridge_softc *, void *); 420 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 421 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 422 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 423 static int bridge_ioctl_gflags(struct bridge_softc *, void *); 424 static int bridge_ioctl_sflags(struct bridge_softc *, void *); 425 static int bridge_ioctl_gdefpvid(struct bridge_softc *, void *); 426 static int bridge_ioctl_sdefpvid(struct bridge_softc *, void *); 427 static int bridge_ioctl_svlanproto(struct bridge_softc *, void *); 428 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 429 int); 430 #ifdef INET 431 static int bridge_ip_checkbasic(struct mbuf **mp); 432 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 433 struct ether_header *, int, struct llc *); 434 #endif /* INET */ 435 #ifdef INET6 436 static int bridge_ip6_checkbasic(struct mbuf **mp); 437 #endif /* INET6 */ 438 static void bridge_linkstate(struct ifnet *ifp); 439 static void bridge_linkcheck(struct bridge_softc *sc); 440 441 /* 442 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2 443 * to indicate untagged frames. 444 */ 445 #define VLANTAGOF(_m) \ 446 ((_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL) 447 448 static struct bstp_cb_ops bridge_ops = { 449 .bcb_state = bridge_state_change, 450 .bcb_rtage = bridge_rtable_expire 451 }; 452 453 SYSCTL_DECL(_net_link); 454 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 455 "Bridge"); 456 457 /* only pass IP[46] packets when pfil is enabled */ 458 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 459 #define V_pfil_onlyip VNET(pfil_onlyip) 460 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 461 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 462 "Only pass IP packets when pfil is enabled"); 463 464 /* run pfil hooks on the bridge interface */ 465 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 466 #define V_pfil_bridge VNET(pfil_bridge) 467 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 468 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 469 "Packet filter on the bridge interface"); 470 471 /* layer2 filter with ipfw */ 472 VNET_DEFINE_STATIC(int, pfil_ipfw); 473 #define V_pfil_ipfw VNET(pfil_ipfw) 474 475 /* layer2 ARP filter with ipfw */ 476 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 477 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 478 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 479 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 480 "Filter ARP packets through IPFW layer2"); 481 482 /* run pfil hooks on the member interface */ 483 VNET_DEFINE_STATIC(int, pfil_member) = 0; 484 #define V_pfil_member VNET(pfil_member) 485 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 486 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 487 "Packet filter on the member interface"); 488 489 /* run pfil hooks on the physical interface for locally destined packets */ 490 VNET_DEFINE_STATIC(int, pfil_local_phys); 491 #define V_pfil_local_phys VNET(pfil_local_phys) 492 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 493 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 494 "Packet filter on the physical interface for locally destined packets"); 495 496 /* log STP state changes */ 497 VNET_DEFINE_STATIC(int, log_stp); 498 #define V_log_stp VNET(log_stp) 499 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 500 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 501 "Log STP state changes"); 502 503 /* share MAC with first bridge member */ 504 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 505 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 506 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 507 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 508 "Inherit MAC address from the first bridge member"); 509 510 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 511 #define V_allow_llz_overlap VNET(allow_llz_overlap) 512 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 513 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 514 "Allow overlap of link-local scope " 515 "zones of a bridge interface and the member interfaces"); 516 517 /* log MAC address port flapping */ 518 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 519 #define V_log_mac_flap VNET(log_mac_flap) 520 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 521 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 522 "Log MAC address port flapping"); 523 524 /* allow IP addresses on bridge members */ 525 VNET_DEFINE_STATIC(bool, member_ifaddrs) = false; 526 #define V_member_ifaddrs VNET(member_ifaddrs) 527 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, member_ifaddrs, 528 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(member_ifaddrs), false, 529 "Allow layer 3 addresses on bridge members"); 530 531 static bool 532 bridge_member_ifaddrs(void) 533 { 534 return (V_member_ifaddrs); 535 } 536 537 VNET_DEFINE_STATIC(int, log_interval) = 5; 538 VNET_DEFINE_STATIC(int, log_count) = 0; 539 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 540 541 #define V_log_interval VNET(log_interval) 542 #define V_log_count VNET(log_count) 543 #define V_log_last VNET(log_last) 544 545 struct bridge_control { 546 int (*bc_func)(struct bridge_softc *, void *); 547 int bc_argsize; 548 int bc_flags; 549 }; 550 551 #define BC_F_COPYIN 0x01 /* copy arguments in */ 552 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 553 #define BC_F_SUSER 0x04 /* do super-user check */ 554 555 static const struct bridge_control bridge_control_table[] = { 556 { bridge_ioctl_add, sizeof(struct ifbreq), 557 BC_F_COPYIN|BC_F_SUSER }, 558 { bridge_ioctl_del, sizeof(struct ifbreq), 559 BC_F_COPYIN|BC_F_SUSER }, 560 561 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 562 BC_F_COPYIN|BC_F_COPYOUT }, 563 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 564 BC_F_COPYIN|BC_F_SUSER }, 565 566 { bridge_ioctl_scache, sizeof(struct ifbrparam), 567 BC_F_COPYIN|BC_F_SUSER }, 568 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 569 BC_F_COPYOUT }, 570 571 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 572 BC_F_COPYIN|BC_F_COPYOUT }, 573 { bridge_ioctl_rts, sizeof(struct ifbaconf), 574 BC_F_COPYIN|BC_F_COPYOUT }, 575 576 { bridge_ioctl_saddr, sizeof(struct ifbareq), 577 BC_F_COPYIN|BC_F_SUSER }, 578 579 { bridge_ioctl_sto, sizeof(struct ifbrparam), 580 BC_F_COPYIN|BC_F_SUSER }, 581 { bridge_ioctl_gto, sizeof(struct ifbrparam), 582 BC_F_COPYOUT }, 583 584 { bridge_ioctl_daddr, sizeof(struct ifbareq), 585 BC_F_COPYIN|BC_F_SUSER }, 586 587 { bridge_ioctl_flush, sizeof(struct ifbreq), 588 BC_F_COPYIN|BC_F_SUSER }, 589 590 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 591 BC_F_COPYOUT }, 592 { bridge_ioctl_spri, sizeof(struct ifbrparam), 593 BC_F_COPYIN|BC_F_SUSER }, 594 595 { bridge_ioctl_ght, sizeof(struct ifbrparam), 596 BC_F_COPYOUT }, 597 { bridge_ioctl_sht, sizeof(struct ifbrparam), 598 BC_F_COPYIN|BC_F_SUSER }, 599 600 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 601 BC_F_COPYOUT }, 602 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 603 BC_F_COPYIN|BC_F_SUSER }, 604 605 { bridge_ioctl_gma, sizeof(struct ifbrparam), 606 BC_F_COPYOUT }, 607 { bridge_ioctl_sma, sizeof(struct ifbrparam), 608 BC_F_COPYIN|BC_F_SUSER }, 609 610 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 611 BC_F_COPYIN|BC_F_SUSER }, 612 613 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 614 BC_F_COPYIN|BC_F_SUSER }, 615 616 { bridge_ioctl_addspan, sizeof(struct ifbreq), 617 BC_F_COPYIN|BC_F_SUSER }, 618 { bridge_ioctl_delspan, sizeof(struct ifbreq), 619 BC_F_COPYIN|BC_F_SUSER }, 620 621 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 622 BC_F_COPYOUT }, 623 624 { bridge_ioctl_grte, sizeof(struct ifbrparam), 625 BC_F_COPYOUT }, 626 627 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 628 BC_F_COPYIN|BC_F_COPYOUT }, 629 630 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 631 BC_F_COPYIN|BC_F_SUSER }, 632 633 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 634 BC_F_COPYIN|BC_F_SUSER }, 635 636 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 637 BC_F_COPYIN|BC_F_SUSER }, 638 639 { bridge_ioctl_sifpvid, sizeof(struct ifbreq), 640 BC_F_COPYIN|BC_F_SUSER }, 641 642 { bridge_ioctl_sifvlanset, sizeof(struct ifbif_vlan_req), 643 BC_F_COPYIN|BC_F_SUSER }, 644 645 { bridge_ioctl_gifvlanset, sizeof(struct ifbif_vlan_req), 646 BC_F_COPYIN|BC_F_COPYOUT }, 647 648 { bridge_ioctl_gflags, sizeof(struct ifbrparam), 649 BC_F_COPYOUT }, 650 651 { bridge_ioctl_sflags, sizeof(struct ifbrparam), 652 BC_F_COPYIN|BC_F_SUSER }, 653 654 { bridge_ioctl_gdefpvid, sizeof(struct ifbrparam), 655 BC_F_COPYOUT }, 656 657 { bridge_ioctl_sdefpvid, sizeof(struct ifbrparam), 658 BC_F_COPYIN|BC_F_SUSER }, 659 660 { bridge_ioctl_svlanproto, sizeof(struct ifbreq), 661 BC_F_COPYIN|BC_F_SUSER }, 662 }; 663 static const int bridge_control_table_size = nitems(bridge_control_table); 664 665 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list) = 666 LIST_HEAD_INITIALIZER(); 667 #define V_bridge_list VNET(bridge_list) 668 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 669 "if_bridge list") 670 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 671 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 672 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 673 674 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 675 #define V_bridge_cloner VNET(bridge_cloner) 676 677 static const char bridge_name[] = "bridge"; 678 679 static void 680 vnet_bridge_init(const void *unused __unused) 681 { 682 683 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 684 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 685 UMA_ALIGN_PTR, 0); 686 BRIDGE_LIST_LOCK_INIT(); 687 688 struct if_clone_addreq req = { 689 .create_f = bridge_clone_create, 690 .destroy_f = bridge_clone_destroy, 691 .flags = IFC_F_AUTOUNIT, 692 }; 693 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 694 } 695 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 696 vnet_bridge_init, NULL); 697 698 static void 699 vnet_bridge_uninit(const void *unused __unused) 700 { 701 702 ifc_detach_cloner(V_bridge_cloner); 703 V_bridge_cloner = NULL; 704 BRIDGE_LIST_LOCK_DESTROY(); 705 706 /* Callbacks may use the UMA zone. */ 707 NET_EPOCH_DRAIN_CALLBACKS(); 708 709 uma_zdestroy(V_bridge_rtnode_zone); 710 } 711 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 712 vnet_bridge_uninit, NULL); 713 714 static int 715 bridge_modevent(module_t mod, int type, void *data) 716 { 717 718 switch (type) { 719 case MOD_LOAD: 720 bridge_dn_p = bridge_dummynet; 721 bridge_same_p = bridge_same; 722 bridge_get_softc_p = bridge_get_softc; 723 bridge_member_ifaddrs_p = bridge_member_ifaddrs; 724 bridge_detach_cookie = EVENTHANDLER_REGISTER( 725 ifnet_departure_event, bridge_ifdetach, NULL, 726 EVENTHANDLER_PRI_ANY); 727 break; 728 case MOD_UNLOAD: 729 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 730 bridge_detach_cookie); 731 bridge_dn_p = NULL; 732 bridge_same_p = NULL; 733 bridge_get_softc_p = NULL; 734 bridge_member_ifaddrs_p = NULL; 735 break; 736 default: 737 return (EOPNOTSUPP); 738 } 739 return (0); 740 } 741 742 static moduledata_t bridge_mod = { 743 "if_bridge", 744 bridge_modevent, 745 0 746 }; 747 748 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 749 MODULE_VERSION(if_bridge, 1); 750 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 751 752 /* 753 * handler for net.link.bridge.ipfw 754 */ 755 static int 756 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 757 { 758 int enable = V_pfil_ipfw; 759 int error; 760 761 error = sysctl_handle_int(oidp, &enable, 0, req); 762 enable &= 1; 763 764 if (enable != V_pfil_ipfw) { 765 V_pfil_ipfw = enable; 766 767 /* 768 * Disable pfil so that ipfw doesnt run twice, if the user 769 * really wants both then they can re-enable pfil_bridge and/or 770 * pfil_member. Also allow non-ip packets as ipfw can filter by 771 * layer2 type. 772 */ 773 if (V_pfil_ipfw) { 774 V_pfil_onlyip = 0; 775 V_pfil_bridge = 0; 776 V_pfil_member = 0; 777 } 778 } 779 780 return (error); 781 } 782 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 783 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 784 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 785 "Layer2 filter with IPFW"); 786 787 #ifdef VIMAGE 788 static void 789 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 790 { 791 struct bridge_softc *sc = ifp->if_softc; 792 struct bridge_iflist *bif; 793 794 BRIDGE_LOCK(sc); 795 796 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 797 bridge_delete_member(sc, bif, 0); 798 799 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 800 bridge_delete_span(sc, bif); 801 } 802 803 BRIDGE_UNLOCK(sc); 804 805 ether_reassign(ifp, newvnet, arg); 806 } 807 #endif 808 809 /* 810 * bridge_get_softc: 811 * 812 * Return the bridge softc for an ifnet. 813 */ 814 static void * 815 bridge_get_softc(struct ifnet *ifp) 816 { 817 struct bridge_iflist *bif; 818 819 NET_EPOCH_ASSERT(); 820 821 bif = ifp->if_bridge; 822 if (bif == NULL) 823 return (NULL); 824 return (bif->bif_sc); 825 } 826 827 /* 828 * bridge_same: 829 * 830 * Return true if two interfaces are in the same bridge. This is only used by 831 * bridgestp via bridge_same_p. 832 */ 833 static bool 834 bridge_same(const void *bifap, const void *bifbp) 835 { 836 const struct bridge_iflist *bifa = bifap, *bifb = bifbp; 837 838 NET_EPOCH_ASSERT(); 839 840 if (bifa == NULL || bifb == NULL) 841 return (false); 842 843 return (bifa->bif_sc == bifb->bif_sc); 844 } 845 846 /* 847 * bridge_clone_create: 848 * 849 * Create a new bridge instance. 850 */ 851 static int 852 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 853 struct ifc_data *ifd, struct ifnet **ifpp) 854 { 855 struct bridge_softc *sc; 856 struct ifnet *ifp; 857 858 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 859 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 860 861 BRIDGE_LOCK_INIT(sc); 862 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 863 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 864 865 /* Initialize our routing table. */ 866 bridge_rtable_init(sc); 867 868 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 869 870 CK_LIST_INIT(&sc->sc_iflist); 871 CK_LIST_INIT(&sc->sc_spanlist); 872 873 ifp->if_softc = sc; 874 if_initname(ifp, bridge_name, ifd->unit); 875 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 876 ifp->if_capabilities = ifp->if_capenable = IFCAP_VLAN_HWTAGGING; 877 ifp->if_ioctl = bridge_ioctl; 878 #ifdef ALTQ 879 ifp->if_start = bridge_altq_start; 880 ifp->if_transmit = bridge_altq_transmit; 881 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 882 ifp->if_snd.ifq_drv_maxlen = 0; 883 IFQ_SET_READY(&ifp->if_snd); 884 #else 885 ifp->if_transmit = bridge_transmit; 886 #endif 887 ifp->if_qflush = bridge_qflush; 888 ifp->if_init = bridge_init; 889 ifp->if_type = IFT_BRIDGE; 890 891 ether_gen_addr(ifp, &sc->sc_defaddr); 892 893 bstp_attach(&sc->sc_stp, &bridge_ops); 894 ether_ifattach(ifp, sc->sc_defaddr.octet); 895 /* Now undo some of the damage... */ 896 ifp->if_baudrate = 0; 897 #ifdef VIMAGE 898 ifp->if_reassign = bridge_reassign; 899 #endif 900 sc->sc_if_input = ifp->if_input; /* ether_input */ 901 ifp->if_input = bridge_inject; 902 903 /* 904 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge 905 * itself via bridge_inject(). This is required for netmap but 906 * otherwise has no effect. 907 */ 908 ifp->if_bridge_input = bridge_input; 909 910 BRIDGE_LIST_LOCK(); 911 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 912 BRIDGE_LIST_UNLOCK(); 913 *ifpp = ifp; 914 915 return (0); 916 } 917 918 static void 919 bridge_clone_destroy_cb(struct epoch_context *ctx) 920 { 921 struct bridge_softc *sc; 922 923 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 924 925 BRIDGE_LOCK_DESTROY(sc); 926 free(sc, M_DEVBUF); 927 } 928 929 /* 930 * bridge_clone_destroy: 931 * 932 * Destroy a bridge instance. 933 */ 934 static int 935 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 936 { 937 struct bridge_softc *sc = ifp->if_softc; 938 struct bridge_iflist *bif; 939 struct epoch_tracker et; 940 941 BRIDGE_LOCK(sc); 942 943 bridge_stop(ifp, 1); 944 ifp->if_flags &= ~IFF_UP; 945 946 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 947 bridge_delete_member(sc, bif, 0); 948 949 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 950 bridge_delete_span(sc, bif); 951 } 952 953 /* Tear down the routing table. */ 954 bridge_rtable_fini(sc); 955 956 BRIDGE_UNLOCK(sc); 957 958 NET_EPOCH_ENTER(et); 959 960 callout_drain(&sc->sc_brcallout); 961 962 BRIDGE_LIST_LOCK(); 963 LIST_REMOVE(sc, sc_list); 964 BRIDGE_LIST_UNLOCK(); 965 966 bstp_detach(&sc->sc_stp); 967 #ifdef ALTQ 968 IFQ_PURGE(&ifp->if_snd); 969 #endif 970 NET_EPOCH_EXIT(et); 971 972 ether_ifdetach(ifp); 973 if_free(ifp); 974 975 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 976 977 return (0); 978 } 979 980 /* 981 * bridge_ioctl: 982 * 983 * Handle a control request from the operator. 984 */ 985 static int 986 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 987 { 988 struct bridge_softc *sc = ifp->if_softc; 989 struct ifreq *ifr = (struct ifreq *)data; 990 struct bridge_iflist *bif; 991 struct thread *td = curthread; 992 union { 993 struct ifbreq ifbreq; 994 struct ifbifconf ifbifconf; 995 struct ifbareq ifbareq; 996 struct ifbaconf ifbaconf; 997 struct ifbrparam ifbrparam; 998 struct ifbropreq ifbropreq; 999 struct ifbif_vlan_req ifvlanreq; 1000 } args; 1001 struct ifdrv *ifd = (struct ifdrv *) data; 1002 const struct bridge_control *bc; 1003 int error = 0, oldmtu; 1004 1005 BRIDGE_LOCK(sc); 1006 1007 switch (cmd) { 1008 case SIOCADDMULTI: 1009 case SIOCDELMULTI: 1010 break; 1011 1012 case SIOCGDRVSPEC: 1013 case SIOCSDRVSPEC: 1014 if (ifd->ifd_cmd >= bridge_control_table_size) { 1015 error = EXTERROR(EINVAL, "Invalid control command"); 1016 break; 1017 } 1018 bc = &bridge_control_table[ifd->ifd_cmd]; 1019 1020 if (cmd == SIOCGDRVSPEC && 1021 (bc->bc_flags & BC_F_COPYOUT) == 0) { 1022 error = EXTERROR(EINVAL, 1023 "Inappropriate ioctl for command " 1024 "(expected SIOCSDRVSPEC)"); 1025 break; 1026 } 1027 else if (cmd == SIOCSDRVSPEC && 1028 (bc->bc_flags & BC_F_COPYOUT) != 0) { 1029 error = EXTERROR(EINVAL, 1030 "Inappropriate ioctl for command " 1031 "(expected SIOCGDRVSPEC)"); 1032 break; 1033 } 1034 1035 if (bc->bc_flags & BC_F_SUSER) { 1036 error = priv_check(td, PRIV_NET_BRIDGE); 1037 if (error) { 1038 EXTERROR(error, "PRIV_NET_BRIDGE required"); 1039 break; 1040 } 1041 } 1042 1043 if (ifd->ifd_len != bc->bc_argsize || 1044 ifd->ifd_len > sizeof(args)) { 1045 error = EXTERROR(EINVAL, "Invalid argument size"); 1046 break; 1047 } 1048 1049 bzero(&args, sizeof(args)); 1050 if (bc->bc_flags & BC_F_COPYIN) { 1051 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 1052 if (error) 1053 break; 1054 } 1055 1056 oldmtu = ifp->if_mtu; 1057 error = (*bc->bc_func)(sc, &args); 1058 if (error) 1059 break; 1060 1061 /* 1062 * Bridge MTU may change during addition of the first port. 1063 * If it did, do network layer specific procedure. 1064 */ 1065 if (ifp->if_mtu != oldmtu) 1066 if_notifymtu(ifp); 1067 1068 if (bc->bc_flags & BC_F_COPYOUT) 1069 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 1070 1071 break; 1072 1073 case SIOCSIFFLAGS: 1074 if (!(ifp->if_flags & IFF_UP) && 1075 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 1076 /* 1077 * If interface is marked down and it is running, 1078 * then stop and disable it. 1079 */ 1080 bridge_stop(ifp, 1); 1081 } else if ((ifp->if_flags & IFF_UP) && 1082 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 1083 /* 1084 * If interface is marked up and it is stopped, then 1085 * start it. 1086 */ 1087 BRIDGE_UNLOCK(sc); 1088 (*ifp->if_init)(sc); 1089 BRIDGE_LOCK(sc); 1090 } 1091 break; 1092 1093 case SIOCSIFMTU: 1094 oldmtu = sc->sc_ifp->if_mtu; 1095 1096 if (ifr->ifr_mtu < IF_MINMTU) { 1097 error = EXTERROR(EINVAL, 1098 "Requested MTU is lower than IF_MINMTU"); 1099 break; 1100 } 1101 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1102 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 1103 break; 1104 } 1105 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1106 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 1107 SIOCSIFMTU, (caddr_t)ifr); 1108 if (error != 0) { 1109 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1110 " member %s\n", sc->sc_ifp->if_xname, 1111 ifr->ifr_mtu, 1112 bif->bif_ifp->if_xname); 1113 error = EINVAL; 1114 break; 1115 } 1116 } 1117 if (error) { 1118 /* Restore the previous MTU on all member interfaces. */ 1119 ifr->ifr_mtu = oldmtu; 1120 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1121 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 1122 SIOCSIFMTU, (caddr_t)ifr); 1123 } 1124 EXTERROR(error, 1125 "Failed to set MTU on member interface"); 1126 } else { 1127 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 1128 } 1129 break; 1130 default: 1131 /* 1132 * drop the lock as ether_ioctl() will call bridge_start() and 1133 * cause the lock to be recursed. 1134 */ 1135 BRIDGE_UNLOCK(sc); 1136 error = ether_ioctl(ifp, cmd, data); 1137 BRIDGE_LOCK(sc); 1138 break; 1139 } 1140 1141 BRIDGE_UNLOCK(sc); 1142 1143 return (error); 1144 } 1145 1146 /* 1147 * bridge_mutecaps: 1148 * 1149 * Clear or restore unwanted capabilities on the member interface 1150 */ 1151 static void 1152 bridge_mutecaps(struct bridge_softc *sc) 1153 { 1154 struct bridge_iflist *bif; 1155 int enabled, mask; 1156 1157 BRIDGE_LOCK_ASSERT(sc); 1158 1159 /* Initial bitmask of capabilities to test */ 1160 mask = BRIDGE_IFCAPS_MASK; 1161 1162 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1163 /* Every member must support it or it's disabled */ 1164 mask &= bif->bif_savedcaps; 1165 } 1166 1167 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1168 enabled = bif->bif_ifp->if_capenable; 1169 enabled &= ~BRIDGE_IFCAPS_STRIP; 1170 /* Strip off mask bits and enable them again if allowed */ 1171 enabled &= ~BRIDGE_IFCAPS_MASK; 1172 enabled |= mask; 1173 bridge_set_ifcap(sc, bif, enabled); 1174 } 1175 } 1176 1177 static void 1178 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1179 { 1180 struct ifnet *ifp = bif->bif_ifp; 1181 struct ifreq ifr; 1182 int error, mask, stuck; 1183 1184 bzero(&ifr, sizeof(ifr)); 1185 ifr.ifr_reqcap = set; 1186 1187 if (ifp->if_capenable != set) { 1188 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1189 if (error) 1190 if_printf(sc->sc_ifp, 1191 "error setting capabilities on %s: %d\n", 1192 ifp->if_xname, error); 1193 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1194 stuck = ifp->if_capenable & mask & ~set; 1195 if (stuck != 0) 1196 if_printf(sc->sc_ifp, 1197 "can't disable some capabilities on %s: 0x%x\n", 1198 ifp->if_xname, stuck); 1199 } 1200 } 1201 1202 /* 1203 * bridge_lookup_member: 1204 * 1205 * Lookup a bridge member interface. 1206 */ 1207 static struct bridge_iflist * 1208 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1209 { 1210 struct bridge_iflist *bif; 1211 struct ifnet *ifp; 1212 1213 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1214 1215 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1216 ifp = bif->bif_ifp; 1217 if (strcmp(ifp->if_xname, name) == 0) 1218 return (bif); 1219 } 1220 1221 return (NULL); 1222 } 1223 1224 /* 1225 * bridge_lookup_member_if: 1226 * 1227 * Lookup a bridge member interface by ifnet*. 1228 */ 1229 static struct bridge_iflist * 1230 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1231 { 1232 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1233 return (member_ifp->if_bridge); 1234 } 1235 1236 static void 1237 bridge_delete_member_cb(struct epoch_context *ctx) 1238 { 1239 struct bridge_iflist *bif; 1240 1241 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1242 1243 free(bif, M_DEVBUF); 1244 } 1245 1246 /* 1247 * bridge_delete_member: 1248 * 1249 * Delete the specified member interface. 1250 */ 1251 static void 1252 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1253 int gone) 1254 { 1255 struct ifnet *ifs = bif->bif_ifp; 1256 struct ifnet *fif = NULL; 1257 struct bridge_iflist *bifl; 1258 1259 BRIDGE_LOCK_ASSERT(sc); 1260 1261 if (bif->bif_flags & IFBIF_STP) 1262 bstp_disable(&bif->bif_stp); 1263 1264 ifs->if_bridge = NULL; 1265 CK_LIST_REMOVE(bif, bif_next); 1266 1267 /* 1268 * If removing the interface that gave the bridge its mac address, set 1269 * the mac address of the bridge to the address of the next member, or 1270 * to its default address if no members are left. 1271 */ 1272 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1273 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1274 bcopy(&sc->sc_defaddr, 1275 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1276 sc->sc_ifaddr = NULL; 1277 } else { 1278 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1279 fif = bifl->bif_ifp; 1280 bcopy(IF_LLADDR(fif), 1281 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1282 sc->sc_ifaddr = fif; 1283 } 1284 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1285 } 1286 1287 bridge_linkcheck(sc); 1288 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1289 BRIDGE_RT_LOCK(sc); 1290 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1291 BRIDGE_RT_UNLOCK(sc); 1292 KASSERT(bif->bif_addrcnt == 0, 1293 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1294 1295 ifs->if_bridge_output = NULL; 1296 ifs->if_bridge_input = NULL; 1297 ifs->if_bridge_linkstate = NULL; 1298 if (!gone) { 1299 switch (ifs->if_type) { 1300 case IFT_ETHER: 1301 case IFT_L2VLAN: 1302 /* 1303 * Take the interface out of promiscuous mode, but only 1304 * if it was promiscuous in the first place. It might 1305 * not be if we're in the bridge_ioctl_add() error path. 1306 */ 1307 if (ifs->if_flags & IFF_PROMISC) 1308 (void) ifpromisc(ifs, 0); 1309 break; 1310 1311 case IFT_GIF: 1312 break; 1313 1314 default: 1315 #ifdef DIAGNOSTIC 1316 panic("bridge_delete_member: impossible"); 1317 #endif 1318 break; 1319 } 1320 /* Re-enable any interface capabilities */ 1321 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1322 } 1323 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1324 1325 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1326 } 1327 1328 /* 1329 * bridge_delete_span: 1330 * 1331 * Delete the specified span interface. 1332 */ 1333 static void 1334 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1335 { 1336 BRIDGE_LOCK_ASSERT(sc); 1337 1338 KASSERT(bif->bif_ifp->if_bridge == NULL, 1339 ("%s: not a span interface", __func__)); 1340 1341 CK_LIST_REMOVE(bif, bif_next); 1342 1343 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1344 } 1345 1346 static int 1347 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1348 { 1349 struct ifbreq *req = arg; 1350 struct bridge_iflist *bif = NULL; 1351 struct ifnet *ifs; 1352 int error = 0; 1353 1354 ifs = ifunit(req->ifbr_ifsname); 1355 if (ifs == NULL) 1356 return (EXTERROR(ENOENT, "No such interface", 1357 req->ifbr_ifsname)); 1358 if (ifs->if_ioctl == NULL) /* must be supported */ 1359 return (EXTERROR(EINVAL, "Interface must support ioctl(2)")); 1360 1361 /* 1362 * If the new interface is a vlan(4), it could be a bridge SVI. 1363 * Don't allow such things to be added to bridges. 1364 */ 1365 if (ifs->if_type == IFT_L2VLAN) { 1366 struct ifnet *parent; 1367 struct epoch_tracker et; 1368 bool is_bridge; 1369 1370 /* 1371 * Entering NET_EPOCH with BRIDGE_LOCK held, but this is okay 1372 * since we don't sleep here. 1373 */ 1374 NET_EPOCH_ENTER(et); 1375 parent = VLAN_TRUNKDEV(ifs); 1376 is_bridge = (parent != NULL && parent->if_type == IFT_BRIDGE); 1377 NET_EPOCH_EXIT(et); 1378 1379 if (is_bridge) 1380 return (EXTERROR(EINVAL, 1381 "Bridge SVI cannot be added to a bridge")); 1382 } 1383 1384 /* If it's in the span list, it can't be a member. */ 1385 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1386 if (ifs == bif->bif_ifp) 1387 return (EXTERROR(EBUSY, 1388 "Span interface cannot be a member")); 1389 1390 if (ifs->if_bridge) { 1391 struct bridge_iflist *sbif = ifs->if_bridge; 1392 if (sbif->bif_sc == sc) 1393 return (EXTERROR(EEXIST, 1394 "Interface is already a member of this bridge")); 1395 1396 return (EXTERROR(EBUSY, 1397 "Interface is already a member of another bridge")); 1398 } 1399 1400 switch (ifs->if_type) { 1401 case IFT_ETHER: 1402 case IFT_L2VLAN: 1403 case IFT_GIF: 1404 /* permitted interface types */ 1405 break; 1406 default: 1407 return (EXTERROR(EINVAL, "Unsupported interface type")); 1408 } 1409 1410 #ifdef INET6 1411 /* 1412 * Two valid inet6 addresses with link-local scope must not be 1413 * on the parent interface and the member interfaces at the 1414 * same time. This restriction is needed to prevent violation 1415 * of link-local scope zone. Attempts to add a member 1416 * interface which has inet6 addresses when the parent has 1417 * inet6 triggers removal of all inet6 addresses on the member 1418 * interface. 1419 */ 1420 1421 /* Check if the parent interface has a link-local scope addr. */ 1422 if (V_allow_llz_overlap == 0 && 1423 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1424 /* 1425 * If any, remove all inet6 addresses from the member 1426 * interfaces. 1427 */ 1428 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1429 if (in6ifa_llaonifp(bif->bif_ifp)) { 1430 in6_ifdetach(bif->bif_ifp); 1431 if_printf(sc->sc_ifp, 1432 "IPv6 addresses on %s have been removed " 1433 "before adding it as a member to prevent " 1434 "IPv6 address scope violation.\n", 1435 bif->bif_ifp->if_xname); 1436 } 1437 } 1438 if (in6ifa_llaonifp(ifs)) { 1439 in6_ifdetach(ifs); 1440 if_printf(sc->sc_ifp, 1441 "IPv6 addresses on %s have been removed " 1442 "before adding it as a member to prevent " 1443 "IPv6 address scope violation.\n", 1444 ifs->if_xname); 1445 } 1446 } 1447 #endif 1448 1449 /* 1450 * If member_ifaddrs is disabled, do not allow an Ethernet-like 1451 * interface with assigned IP addresses to be added to a bridge. 1452 */ 1453 if (!V_member_ifaddrs && ifs->if_type != IFT_GIF) { 1454 struct ifaddr *ifa; 1455 1456 CK_STAILQ_FOREACH(ifa, &ifs->if_addrhead, ifa_link) { 1457 #ifdef INET 1458 if (ifa->ifa_addr->sa_family == AF_INET) 1459 return (EXTERROR(EINVAL, 1460 "Member interface may not have " 1461 "an IPv4 address configured")); 1462 #endif 1463 #ifdef INET6 1464 if (ifa->ifa_addr->sa_family == AF_INET6) 1465 return (EXTERROR(EINVAL, 1466 "Member interface may not have " 1467 "an IPv6 address configured")); 1468 #endif 1469 } 1470 } 1471 1472 /* Allow the first Ethernet member to define the MTU */ 1473 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1474 sc->sc_ifp->if_mtu = ifs->if_mtu; 1475 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1476 struct ifreq ifr; 1477 1478 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1479 ifs->if_xname); 1480 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1481 1482 error = (*ifs->if_ioctl)(ifs, 1483 SIOCSIFMTU, (caddr_t)&ifr); 1484 if (error != 0) { 1485 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1486 " new member %s\n", sc->sc_ifp->if_xname, 1487 ifr.ifr_mtu, 1488 ifs->if_xname); 1489 return (EXTERROR(EINVAL, 1490 "Failed to set MTU on new member")); 1491 } 1492 } 1493 1494 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1495 if (bif == NULL) 1496 return (ENOMEM); 1497 1498 bif->bif_sc = sc; 1499 bif->bif_ifp = ifs; 1500 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1501 bif->bif_savedcaps = ifs->if_capenable; 1502 bif->bif_vlanproto = ETHERTYPE_VLAN; 1503 bif->bif_pvid = sc->sc_defpvid; 1504 if (sc->sc_flags & IFBRF_DEFQINQ) 1505 bif->bif_flags |= IFBIF_QINQ; 1506 1507 /* 1508 * Assign the interface's MAC address to the bridge if it's the first 1509 * member and the MAC address of the bridge has not been changed from 1510 * the default randomly generated one. 1511 */ 1512 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1513 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1514 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1515 sc->sc_ifaddr = ifs; 1516 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1517 } 1518 1519 ifs->if_bridge = bif; 1520 ifs->if_bridge_output = bridge_output; 1521 ifs->if_bridge_input = bridge_input; 1522 ifs->if_bridge_linkstate = bridge_linkstate; 1523 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1524 /* 1525 * XXX: XLOCK HERE!?! 1526 * 1527 * NOTE: insert_***HEAD*** should be safe for the traversals. 1528 */ 1529 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1530 1531 /* Set interface capabilities to the intersection set of all members */ 1532 bridge_mutecaps(sc); 1533 bridge_linkcheck(sc); 1534 1535 /* Place the interface into promiscuous mode */ 1536 switch (ifs->if_type) { 1537 case IFT_ETHER: 1538 case IFT_L2VLAN: 1539 error = ifpromisc(ifs, 1); 1540 break; 1541 } 1542 1543 if (error) 1544 bridge_delete_member(sc, bif, 0); 1545 return (error); 1546 } 1547 1548 static int 1549 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1550 { 1551 struct ifbreq *req = arg; 1552 struct bridge_iflist *bif; 1553 1554 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1555 if (bif == NULL) 1556 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1557 1558 bridge_delete_member(sc, bif, 0); 1559 1560 return (0); 1561 } 1562 1563 static int 1564 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1565 { 1566 struct ifbreq *req = arg; 1567 struct bridge_iflist *bif; 1568 struct bstp_port *bp; 1569 1570 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1571 if (bif == NULL) 1572 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1573 1574 bp = &bif->bif_stp; 1575 req->ifbr_ifsflags = bif->bif_flags; 1576 req->ifbr_state = bp->bp_state; 1577 req->ifbr_priority = bp->bp_priority; 1578 req->ifbr_path_cost = bp->bp_path_cost; 1579 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1580 req->ifbr_proto = bp->bp_protover; 1581 req->ifbr_role = bp->bp_role; 1582 req->ifbr_stpflags = bp->bp_flags; 1583 req->ifbr_addrcnt = bif->bif_addrcnt; 1584 req->ifbr_addrmax = bif->bif_addrmax; 1585 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1586 req->ifbr_pvid = bif->bif_pvid; 1587 req->ifbr_vlanproto = bif->bif_vlanproto; 1588 1589 /* Copy STP state options as flags */ 1590 if (bp->bp_operedge) 1591 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1592 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1593 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1594 if (bp->bp_ptp_link) 1595 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1596 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1597 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1598 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1599 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1600 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1601 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1602 return (0); 1603 } 1604 1605 static int 1606 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1607 { 1608 struct epoch_tracker et; 1609 struct ifbreq *req = arg; 1610 struct bridge_iflist *bif; 1611 struct bstp_port *bp; 1612 int error; 1613 1614 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1615 if (bif == NULL) 1616 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1617 bp = &bif->bif_stp; 1618 1619 if (req->ifbr_ifsflags & IFBIF_SPAN) 1620 /* SPAN is readonly */ 1621 return (EXTERROR(EINVAL, "Span interface cannot be modified")); 1622 1623 NET_EPOCH_ENTER(et); 1624 1625 if (req->ifbr_ifsflags & IFBIF_STP) { 1626 if ((bif->bif_flags & IFBIF_STP) == 0) { 1627 error = bstp_enable(&bif->bif_stp); 1628 if (error) { 1629 NET_EPOCH_EXIT(et); 1630 return (EXTERROR(error, 1631 "Failed to enable STP")); 1632 } 1633 } 1634 } else { 1635 if ((bif->bif_flags & IFBIF_STP) != 0) 1636 bstp_disable(&bif->bif_stp); 1637 } 1638 1639 /* Pass on STP flags */ 1640 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1641 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1642 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1643 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1644 1645 /* Save the bits relating to the bridge */ 1646 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1647 1648 NET_EPOCH_EXIT(et); 1649 1650 return (0); 1651 } 1652 1653 static int 1654 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1655 { 1656 struct ifbrparam *param = arg; 1657 1658 sc->sc_brtmax = param->ifbrp_csize; 1659 bridge_rttrim(sc); 1660 1661 return (0); 1662 } 1663 1664 static int 1665 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1666 { 1667 struct ifbrparam *param = arg; 1668 1669 param->ifbrp_csize = sc->sc_brtmax; 1670 1671 return (0); 1672 } 1673 1674 static int 1675 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1676 { 1677 struct ifbifconf *bifc = arg; 1678 struct bridge_iflist *bif; 1679 struct ifbreq breq; 1680 char *buf, *outbuf; 1681 int count, buflen, len, error = 0; 1682 1683 count = 0; 1684 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1685 count++; 1686 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1687 count++; 1688 1689 buflen = sizeof(breq) * count; 1690 if (bifc->ifbic_len == 0) { 1691 bifc->ifbic_len = buflen; 1692 return (0); 1693 } 1694 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1695 if (outbuf == NULL) 1696 return (ENOMEM); 1697 1698 count = 0; 1699 buf = outbuf; 1700 len = min(bifc->ifbic_len, buflen); 1701 bzero(&breq, sizeof(breq)); 1702 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1703 if (len < sizeof(breq)) 1704 break; 1705 1706 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1707 sizeof(breq.ifbr_ifsname)); 1708 /* Fill in the ifbreq structure */ 1709 error = bridge_ioctl_gifflags(sc, &breq); 1710 if (error) 1711 break; 1712 memcpy(buf, &breq, sizeof(breq)); 1713 count++; 1714 buf += sizeof(breq); 1715 len -= sizeof(breq); 1716 } 1717 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1718 if (len < sizeof(breq)) 1719 break; 1720 1721 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1722 sizeof(breq.ifbr_ifsname)); 1723 breq.ifbr_ifsflags = bif->bif_flags; 1724 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1725 memcpy(buf, &breq, sizeof(breq)); 1726 count++; 1727 buf += sizeof(breq); 1728 len -= sizeof(breq); 1729 } 1730 1731 bifc->ifbic_len = sizeof(breq) * count; 1732 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1733 free(outbuf, M_TEMP); 1734 return (error); 1735 } 1736 1737 static int 1738 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1739 { 1740 struct ifbaconf *bac = arg; 1741 struct bridge_rtnode *brt; 1742 struct ifbareq bareq; 1743 char *buf, *outbuf; 1744 int count, buflen, len, error = 0; 1745 1746 if (bac->ifbac_len == 0) 1747 return (0); 1748 1749 count = 0; 1750 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1751 count++; 1752 buflen = sizeof(bareq) * count; 1753 1754 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1755 if (outbuf == NULL) 1756 return (ENOMEM); 1757 1758 count = 0; 1759 buf = outbuf; 1760 len = min(bac->ifbac_len, buflen); 1761 bzero(&bareq, sizeof(bareq)); 1762 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1763 if (len < sizeof(bareq)) 1764 goto out; 1765 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1766 sizeof(bareq.ifba_ifsname)); 1767 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1768 bareq.ifba_vlan = brt->brt_vlan; 1769 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1770 time_uptime < brt->brt_expire) 1771 bareq.ifba_expire = brt->brt_expire - time_uptime; 1772 else 1773 bareq.ifba_expire = 0; 1774 bareq.ifba_flags = brt->brt_flags; 1775 1776 memcpy(buf, &bareq, sizeof(bareq)); 1777 count++; 1778 buf += sizeof(bareq); 1779 len -= sizeof(bareq); 1780 } 1781 out: 1782 bac->ifbac_len = sizeof(bareq) * count; 1783 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1784 free(outbuf, M_TEMP); 1785 return (error); 1786 } 1787 1788 static int 1789 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1790 { 1791 struct ifbareq *req = arg; 1792 struct bridge_iflist *bif; 1793 struct epoch_tracker et; 1794 int error; 1795 1796 NET_EPOCH_ENTER(et); 1797 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1798 if (bif == NULL) { 1799 NET_EPOCH_EXIT(et); 1800 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1801 } 1802 1803 /* bridge_rtupdate() may acquire the lock. */ 1804 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1805 req->ifba_flags); 1806 NET_EPOCH_EXIT(et); 1807 1808 return (error); 1809 } 1810 1811 static int 1812 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1813 { 1814 struct ifbrparam *param = arg; 1815 1816 sc->sc_brttimeout = param->ifbrp_ctime; 1817 return (0); 1818 } 1819 1820 static int 1821 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1822 { 1823 struct ifbrparam *param = arg; 1824 1825 param->ifbrp_ctime = sc->sc_brttimeout; 1826 return (0); 1827 } 1828 1829 static int 1830 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1831 { 1832 struct ifbareq *req = arg; 1833 int vlan = req->ifba_vlan; 1834 1835 /* Userspace uses '0' to mean 'any vlan' */ 1836 if (vlan == 0) 1837 vlan = DOT1Q_VID_RSVD_IMPL; 1838 1839 return (bridge_rtdaddr(sc, req->ifba_dst, vlan)); 1840 } 1841 1842 static int 1843 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1844 { 1845 struct ifbreq *req = arg; 1846 1847 BRIDGE_RT_LOCK(sc); 1848 bridge_rtflush(sc, req->ifbr_ifsflags); 1849 BRIDGE_RT_UNLOCK(sc); 1850 1851 return (0); 1852 } 1853 1854 static int 1855 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1856 { 1857 struct ifbrparam *param = arg; 1858 struct bstp_state *bs = &sc->sc_stp; 1859 1860 param->ifbrp_prio = bs->bs_bridge_priority; 1861 return (0); 1862 } 1863 1864 static int 1865 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1866 { 1867 struct ifbrparam *param = arg; 1868 1869 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1870 } 1871 1872 static int 1873 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1874 { 1875 struct ifbrparam *param = arg; 1876 struct bstp_state *bs = &sc->sc_stp; 1877 1878 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1879 return (0); 1880 } 1881 1882 static int 1883 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1884 { 1885 struct ifbrparam *param = arg; 1886 1887 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1888 } 1889 1890 static int 1891 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1892 { 1893 struct ifbrparam *param = arg; 1894 struct bstp_state *bs = &sc->sc_stp; 1895 1896 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1897 return (0); 1898 } 1899 1900 static int 1901 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1902 { 1903 struct ifbrparam *param = arg; 1904 1905 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1906 } 1907 1908 static int 1909 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1910 { 1911 struct ifbrparam *param = arg; 1912 struct bstp_state *bs = &sc->sc_stp; 1913 1914 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1915 return (0); 1916 } 1917 1918 static int 1919 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1920 { 1921 struct ifbrparam *param = arg; 1922 1923 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1924 } 1925 1926 static int 1927 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1928 { 1929 struct ifbreq *req = arg; 1930 struct bridge_iflist *bif; 1931 1932 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1933 if (bif == NULL) 1934 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1935 1936 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1937 } 1938 1939 static int 1940 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1941 { 1942 struct ifbreq *req = arg; 1943 struct bridge_iflist *bif; 1944 1945 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1946 if (bif == NULL) 1947 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1948 1949 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1950 } 1951 1952 static int 1953 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1954 { 1955 struct ifbreq *req = arg; 1956 struct bridge_iflist *bif; 1957 1958 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1959 if (bif == NULL) 1960 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1961 1962 bif->bif_addrmax = req->ifbr_addrmax; 1963 return (0); 1964 } 1965 1966 static int 1967 bridge_ioctl_sifpvid(struct bridge_softc *sc, void *arg) 1968 { 1969 struct ifbreq *req = arg; 1970 struct bridge_iflist *bif; 1971 1972 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1973 if (bif == NULL) 1974 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1975 1976 if (req->ifbr_pvid > DOT1Q_VID_MAX) 1977 return (EXTERROR(EINVAL, "Invalid VLAN ID")); 1978 1979 bif->bif_pvid = req->ifbr_pvid; 1980 return (0); 1981 } 1982 1983 static int 1984 bridge_ioctl_sifvlanset(struct bridge_softc *sc, void *arg) 1985 { 1986 struct ifbif_vlan_req *req = arg; 1987 struct bridge_iflist *bif; 1988 1989 if ((sc->sc_flags & IFBRF_VLANFILTER) == 0) 1990 return (EXTERROR(EINVAL, "VLAN filtering not enabled")); 1991 1992 bif = bridge_lookup_member(sc, req->bv_ifname); 1993 if (bif == NULL) 1994 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1995 1996 /* Reject invalid VIDs. */ 1997 if (BRVLAN_TEST(&req->bv_set, DOT1Q_VID_NULL) || 1998 BRVLAN_TEST(&req->bv_set, DOT1Q_VID_RSVD_IMPL)) 1999 return (EXTERROR(EINVAL, "Invalid VLAN ID in set")); 2000 2001 switch (req->bv_op) { 2002 /* Replace the existing vlan set with the new set */ 2003 case BRDG_VLAN_OP_SET: 2004 BIT_COPY(BRVLAN_SETSIZE, &req->bv_set, &bif->bif_vlan_set); 2005 break; 2006 2007 /* Modify the existing vlan set to add the given vlans */ 2008 case BRDG_VLAN_OP_ADD: 2009 BIT_OR(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2010 break; 2011 2012 /* Modify the existing vlan set to remove the given vlans */ 2013 case BRDG_VLAN_OP_DEL: 2014 BIT_ANDNOT(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2015 break; 2016 2017 /* Invalid or unknown operation */ 2018 default: 2019 return (EXTERROR(EINVAL, 2020 "Unsupported BRDGSIFVLANSET operation")); 2021 } 2022 2023 return (0); 2024 } 2025 2026 static int 2027 bridge_ioctl_gifvlanset(struct bridge_softc *sc, void *arg) 2028 { 2029 struct ifbif_vlan_req *req = arg; 2030 struct bridge_iflist *bif; 2031 2032 bif = bridge_lookup_member(sc, req->bv_ifname); 2033 if (bif == NULL) 2034 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2035 2036 BIT_COPY(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2037 return (0); 2038 } 2039 2040 static int 2041 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 2042 { 2043 struct ifbreq *req = arg; 2044 struct bridge_iflist *bif = NULL; 2045 struct ifnet *ifs; 2046 2047 ifs = ifunit(req->ifbr_ifsname); 2048 if (ifs == NULL) 2049 return (EXTERROR(ENOENT, "No such interface")); 2050 2051 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2052 if (ifs == bif->bif_ifp) 2053 return (EXTERROR(EBUSY, 2054 "Interface is already a span port")); 2055 2056 if (ifs->if_bridge != NULL) 2057 return (EXTERROR(EEXIST, 2058 "Interface is already a bridge member")); 2059 2060 switch (ifs->if_type) { 2061 case IFT_ETHER: 2062 case IFT_GIF: 2063 case IFT_L2VLAN: 2064 break; 2065 default: 2066 return (EXTERROR(EINVAL, "Unsupported interface type")); 2067 } 2068 2069 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 2070 if (bif == NULL) 2071 return (ENOMEM); 2072 2073 bif->bif_ifp = ifs; 2074 bif->bif_flags = IFBIF_SPAN; 2075 2076 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 2077 2078 return (0); 2079 } 2080 2081 static int 2082 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 2083 { 2084 struct ifbreq *req = arg; 2085 struct bridge_iflist *bif; 2086 struct ifnet *ifs; 2087 2088 ifs = ifunit(req->ifbr_ifsname); 2089 if (ifs == NULL) 2090 return (EXTERROR(ENOENT, "No such interface")); 2091 2092 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2093 if (ifs == bif->bif_ifp) 2094 break; 2095 2096 if (bif == NULL) 2097 return (EXTERROR(ENOENT, "Interface is not a span port")); 2098 2099 bridge_delete_span(sc, bif); 2100 2101 return (0); 2102 } 2103 2104 static int 2105 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 2106 { 2107 struct ifbropreq *req = arg; 2108 struct bstp_state *bs = &sc->sc_stp; 2109 struct bstp_port *root_port; 2110 2111 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 2112 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 2113 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 2114 2115 root_port = bs->bs_root_port; 2116 if (root_port == NULL) 2117 req->ifbop_root_port = 0; 2118 else 2119 req->ifbop_root_port = root_port->bp_ifp->if_index; 2120 2121 req->ifbop_holdcount = bs->bs_txholdcount; 2122 req->ifbop_priority = bs->bs_bridge_priority; 2123 req->ifbop_protocol = bs->bs_protover; 2124 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 2125 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 2126 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 2127 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 2128 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 2129 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 2130 2131 return (0); 2132 } 2133 2134 static int 2135 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 2136 { 2137 struct ifbrparam *param = arg; 2138 2139 param->ifbrp_cexceeded = sc->sc_brtexceeded; 2140 return (0); 2141 } 2142 2143 static int 2144 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 2145 { 2146 struct ifbpstpconf *bifstp = arg; 2147 struct bridge_iflist *bif; 2148 struct bstp_port *bp; 2149 struct ifbpstpreq bpreq; 2150 char *buf, *outbuf; 2151 int count, buflen, len, error = 0; 2152 2153 count = 0; 2154 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2155 if ((bif->bif_flags & IFBIF_STP) != 0) 2156 count++; 2157 } 2158 2159 buflen = sizeof(bpreq) * count; 2160 if (bifstp->ifbpstp_len == 0) { 2161 bifstp->ifbpstp_len = buflen; 2162 return (0); 2163 } 2164 2165 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 2166 if (outbuf == NULL) 2167 return (ENOMEM); 2168 2169 count = 0; 2170 buf = outbuf; 2171 len = min(bifstp->ifbpstp_len, buflen); 2172 bzero(&bpreq, sizeof(bpreq)); 2173 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2174 if (len < sizeof(bpreq)) 2175 break; 2176 2177 if ((bif->bif_flags & IFBIF_STP) == 0) 2178 continue; 2179 2180 bp = &bif->bif_stp; 2181 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 2182 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 2183 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 2184 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 2185 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 2186 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 2187 2188 memcpy(buf, &bpreq, sizeof(bpreq)); 2189 count++; 2190 buf += sizeof(bpreq); 2191 len -= sizeof(bpreq); 2192 } 2193 2194 bifstp->ifbpstp_len = sizeof(bpreq) * count; 2195 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 2196 free(outbuf, M_TEMP); 2197 return (error); 2198 } 2199 2200 static int 2201 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 2202 { 2203 struct ifbrparam *param = arg; 2204 2205 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 2206 } 2207 2208 static int 2209 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 2210 { 2211 struct ifbrparam *param = arg; 2212 2213 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 2214 } 2215 2216 static int 2217 bridge_ioctl_gflags(struct bridge_softc *sc, void *arg) 2218 { 2219 struct ifbrparam *param = arg; 2220 2221 param->ifbrp_flags = sc->sc_flags; 2222 2223 return (0); 2224 } 2225 2226 static int 2227 bridge_ioctl_sflags(struct bridge_softc *sc, void *arg) 2228 { 2229 struct ifbrparam *param = arg; 2230 2231 sc->sc_flags = param->ifbrp_flags; 2232 2233 return (0); 2234 } 2235 2236 static int 2237 bridge_ioctl_gdefpvid(struct bridge_softc *sc, void *arg) 2238 { 2239 struct ifbrparam *param = arg; 2240 2241 param->ifbrp_defpvid = sc->sc_defpvid; 2242 2243 return (0); 2244 } 2245 2246 static int 2247 bridge_ioctl_sdefpvid(struct bridge_softc *sc, void *arg) 2248 { 2249 struct ifbrparam *param = arg; 2250 2251 /* Reject invalid VIDs, but allow 0 to mean 'none'. */ 2252 if (param->ifbrp_defpvid > DOT1Q_VID_MAX) 2253 return (EINVAL); 2254 2255 sc->sc_defpvid = param->ifbrp_defpvid; 2256 2257 return (0); 2258 } 2259 2260 static int 2261 bridge_ioctl_svlanproto(struct bridge_softc *sc, void *arg) 2262 { 2263 struct ifbreq *req = arg; 2264 struct bridge_iflist *bif; 2265 2266 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 2267 if (bif == NULL) 2268 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2269 2270 if (req->ifbr_vlanproto != ETHERTYPE_VLAN && 2271 req->ifbr_vlanproto != ETHERTYPE_QINQ) 2272 return (EXTERROR(EINVAL, "Invalid VLAN protocol")); 2273 2274 bif->bif_vlanproto = req->ifbr_vlanproto; 2275 2276 return (0); 2277 } 2278 /* 2279 * bridge_ifdetach: 2280 * 2281 * Detach an interface from a bridge. Called when a member 2282 * interface is detaching. 2283 */ 2284 static void 2285 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 2286 { 2287 struct bridge_iflist *bif = ifp->if_bridge; 2288 struct bridge_softc *sc = NULL; 2289 2290 if (bif) 2291 sc = bif->bif_sc; 2292 2293 if (ifp->if_flags & IFF_RENAMING) 2294 return; 2295 if (V_bridge_cloner == NULL) { 2296 /* 2297 * This detach handler can be called after 2298 * vnet_bridge_uninit(). Just return in that case. 2299 */ 2300 return; 2301 } 2302 /* Check if the interface is a bridge member */ 2303 if (sc != NULL) { 2304 BRIDGE_LOCK(sc); 2305 bridge_delete_member(sc, bif, 1); 2306 BRIDGE_UNLOCK(sc); 2307 return; 2308 } 2309 2310 /* Check if the interface is a span port */ 2311 BRIDGE_LIST_LOCK(); 2312 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 2313 BRIDGE_LOCK(sc); 2314 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2315 if (ifp == bif->bif_ifp) { 2316 bridge_delete_span(sc, bif); 2317 break; 2318 } 2319 2320 BRIDGE_UNLOCK(sc); 2321 } 2322 BRIDGE_LIST_UNLOCK(); 2323 } 2324 2325 /* 2326 * bridge_init: 2327 * 2328 * Initialize a bridge interface. 2329 */ 2330 static void 2331 bridge_init(void *xsc) 2332 { 2333 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2334 struct ifnet *ifp = sc->sc_ifp; 2335 2336 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2337 return; 2338 2339 BRIDGE_LOCK(sc); 2340 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2341 bridge_timer, sc); 2342 2343 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2344 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2345 2346 BRIDGE_UNLOCK(sc); 2347 } 2348 2349 /* 2350 * bridge_stop: 2351 * 2352 * Stop the bridge interface. 2353 */ 2354 static void 2355 bridge_stop(struct ifnet *ifp, int disable) 2356 { 2357 struct bridge_softc *sc = ifp->if_softc; 2358 2359 BRIDGE_LOCK_ASSERT(sc); 2360 2361 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2362 return; 2363 2364 BRIDGE_RT_LOCK(sc); 2365 callout_stop(&sc->sc_brcallout); 2366 2367 bstp_stop(&sc->sc_stp); 2368 2369 bridge_rtflush(sc, IFBF_FLUSHDYN); 2370 BRIDGE_RT_UNLOCK(sc); 2371 2372 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2373 } 2374 2375 /* 2376 * bridge_enqueue: 2377 * 2378 * Enqueue a packet on a bridge member interface. 2379 * 2380 */ 2381 static int 2382 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 2383 struct bridge_iflist *bif) 2384 { 2385 int len, err = 0; 2386 short mflags; 2387 struct mbuf *m0; 2388 2389 /* 2390 * Find the bridge member port this packet is being sent on, if the 2391 * caller didn't already provide it. 2392 */ 2393 if (bif == NULL) 2394 bif = bridge_lookup_member_if(sc, dst_ifp); 2395 if (bif == NULL) { 2396 /* Perhaps the interface was removed from the bridge */ 2397 m_freem(m); 2398 return (EINVAL); 2399 } 2400 2401 /* We may be sending a fragment so traverse the mbuf */ 2402 for (; m; m = m0) { 2403 m0 = m->m_nextpkt; 2404 m->m_nextpkt = NULL; 2405 len = m->m_pkthdr.len; 2406 mflags = m->m_flags; 2407 2408 /* 2409 * If the native VLAN ID of the outgoing interface matches the 2410 * VLAN ID of the frame, remove the VLAN tag. 2411 */ 2412 if (bif->bif_pvid != DOT1Q_VID_NULL && 2413 VLANTAGOF(m) == bif->bif_pvid) { 2414 m->m_flags &= ~M_VLANTAG; 2415 m->m_pkthdr.ether_vtag = 0; 2416 } 2417 2418 /* 2419 * There are two cases where we have to insert our own tag: 2420 * if the member interface doesn't support hardware tagging, 2421 * or if the tag proto is not 802.1q. 2422 */ 2423 if ((m->m_flags & M_VLANTAG) && 2424 ((dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0 || 2425 bif->bif_vlanproto != ETHERTYPE_VLAN)) { 2426 m = ether_vlanencap_proto(m, m->m_pkthdr.ether_vtag, 2427 bif->bif_vlanproto); 2428 if (m == NULL) { 2429 if_printf(dst_ifp, 2430 "unable to prepend VLAN header\n"); 2431 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2432 continue; 2433 } 2434 m->m_flags &= ~M_VLANTAG; 2435 } 2436 2437 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2438 /* 2439 * XXXZL: gif(4) requires the af to be saved in csum_data field 2440 * so that gif_transmit() routine can pull it back. 2441 */ 2442 if (dst_ifp->if_type == IFT_GIF) 2443 m->m_pkthdr.csum_data = AF_LINK; 2444 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2445 int n; 2446 2447 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2448 m0 = m->m_nextpkt; 2449 m_freem(m); 2450 } 2451 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2452 break; 2453 } 2454 2455 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2456 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2457 if (mflags & M_MCAST) 2458 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2459 } 2460 2461 return (err); 2462 } 2463 2464 /* 2465 * bridge_dummynet: 2466 * 2467 * Receive a queued packet from dummynet and pass it on to the output 2468 * interface. 2469 * 2470 * The mbuf has the Ethernet header already attached. 2471 */ 2472 static void 2473 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2474 { 2475 struct bridge_iflist *bif = ifp->if_bridge; 2476 struct bridge_softc *sc = NULL; 2477 2478 if (bif) 2479 sc = bif->bif_sc; 2480 2481 /* 2482 * The packet didnt originate from a member interface. This should only 2483 * ever happen if a member interface is removed while packets are 2484 * queued for it. 2485 */ 2486 if (sc == NULL) { 2487 m_freem(m); 2488 return; 2489 } 2490 2491 if (PFIL_HOOKED_OUT_46) { 2492 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2493 return; 2494 if (m == NULL) 2495 return; 2496 } 2497 2498 bridge_enqueue(sc, ifp, m, NULL); 2499 } 2500 2501 /* 2502 * bridge_output: 2503 * 2504 * Send output from a bridge member interface. This 2505 * performs the bridging function for locally originated 2506 * packets. 2507 * 2508 * The mbuf has the Ethernet header already attached. We must 2509 * enqueue or free the mbuf before returning. 2510 */ 2511 static int 2512 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2513 struct rtentry *rt) 2514 { 2515 struct ether_header *eh; 2516 struct bridge_iflist *sbif; 2517 struct ifnet *bifp, *dst_if; 2518 struct bridge_softc *sc; 2519 ether_vlanid_t vlan; 2520 2521 NET_EPOCH_ASSERT(); 2522 2523 if (m->m_len < ETHER_HDR_LEN) { 2524 m = m_pullup(m, ETHER_HDR_LEN); 2525 if (m == NULL) 2526 return (0); 2527 } 2528 2529 sbif = ifp->if_bridge; 2530 sc = sbif->bif_sc; 2531 bifp = sc->sc_ifp; 2532 2533 eh = mtod(m, struct ether_header *); 2534 vlan = VLANTAGOF(m); 2535 2536 /* 2537 * If bridge is down, but the original output interface is up, 2538 * go ahead and send out that interface. Otherwise, the packet 2539 * is dropped below. 2540 */ 2541 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2542 dst_if = ifp; 2543 goto sendunicast; 2544 } 2545 2546 /* 2547 * If the packet is a multicast, or we don't know a better way to 2548 * get there, send to all interfaces. 2549 */ 2550 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2551 dst_if = NULL; 2552 else 2553 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2554 /* Tap any traffic not passing back out the originating interface */ 2555 if (dst_if != ifp) 2556 ETHER_BPF_MTAP(bifp, m); 2557 if (dst_if == NULL) { 2558 struct bridge_iflist *bif; 2559 struct mbuf *mc; 2560 int used = 0; 2561 2562 bridge_span(sc, m); 2563 2564 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2565 dst_if = bif->bif_ifp; 2566 2567 if (dst_if->if_type == IFT_GIF) 2568 continue; 2569 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2570 continue; 2571 2572 /* 2573 * If this is not the original output interface, 2574 * and the interface is participating in spanning 2575 * tree, make sure the port is in a state that 2576 * allows forwarding. 2577 */ 2578 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2579 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2580 continue; 2581 2582 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2583 used = 1; 2584 mc = m; 2585 } else { 2586 mc = m_dup(m, M_NOWAIT); 2587 if (mc == NULL) { 2588 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2589 continue; 2590 } 2591 } 2592 2593 bridge_enqueue(sc, dst_if, mc, bif); 2594 } 2595 if (used == 0) 2596 m_freem(m); 2597 return (0); 2598 } 2599 2600 sendunicast: 2601 /* 2602 * XXX Spanning tree consideration here? 2603 */ 2604 2605 bridge_span(sc, m); 2606 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2607 m_freem(m); 2608 return (0); 2609 } 2610 2611 bridge_enqueue(sc, dst_if, m, NULL); 2612 return (0); 2613 } 2614 2615 /* 2616 * bridge_transmit: 2617 * 2618 * Do output on a bridge. 2619 * 2620 */ 2621 static int 2622 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2623 { 2624 struct bridge_softc *sc; 2625 struct ether_header *eh; 2626 struct ifnet *dst_if; 2627 int error = 0; 2628 ether_vlanid_t vlan; 2629 2630 sc = ifp->if_softc; 2631 2632 ETHER_BPF_MTAP(ifp, m); 2633 2634 eh = mtod(m, struct ether_header *); 2635 vlan = VLANTAGOF(m); 2636 2637 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2638 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan)) != NULL) { 2639 error = bridge_enqueue(sc, dst_if, m, NULL); 2640 } else 2641 bridge_broadcast(sc, ifp, m, 0); 2642 2643 return (error); 2644 } 2645 2646 #ifdef ALTQ 2647 static void 2648 bridge_altq_start(if_t ifp) 2649 { 2650 struct ifaltq *ifq = &ifp->if_snd; 2651 struct mbuf *m; 2652 2653 IFQ_LOCK(ifq); 2654 IFQ_DEQUEUE_NOLOCK(ifq, m); 2655 while (m != NULL) { 2656 bridge_transmit(ifp, m); 2657 IFQ_DEQUEUE_NOLOCK(ifq, m); 2658 } 2659 IFQ_UNLOCK(ifq); 2660 } 2661 2662 static int 2663 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2664 { 2665 int err; 2666 2667 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2668 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2669 if (err == 0) 2670 bridge_altq_start(ifp); 2671 } else 2672 err = bridge_transmit(ifp, m); 2673 2674 return (err); 2675 } 2676 #endif /* ALTQ */ 2677 2678 /* 2679 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2680 */ 2681 static void 2682 bridge_qflush(struct ifnet *ifp __unused) 2683 { 2684 } 2685 2686 /* 2687 * bridge_forward: 2688 * 2689 * The forwarding function of the bridge. 2690 * 2691 * NOTE: Releases the lock on return. 2692 */ 2693 static void 2694 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2695 struct mbuf *m) 2696 { 2697 struct bridge_iflist *dbif; 2698 struct ifnet *src_if, *dst_if, *ifp; 2699 struct ether_header *eh; 2700 uint8_t *dst; 2701 int error; 2702 ether_vlanid_t vlan; 2703 2704 NET_EPOCH_ASSERT(); 2705 2706 src_if = m->m_pkthdr.rcvif; 2707 ifp = sc->sc_ifp; 2708 vlan = VLANTAGOF(m); 2709 2710 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2711 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2712 2713 if ((sbif->bif_flags & IFBIF_STP) && 2714 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2715 goto drop; 2716 2717 eh = mtod(m, struct ether_header *); 2718 dst = eh->ether_dhost; 2719 2720 /* If the interface is learning, record the address. */ 2721 if (sbif->bif_flags & IFBIF_LEARNING) { 2722 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2723 sbif, 0, IFBAF_DYNAMIC); 2724 /* 2725 * If the interface has addresses limits then deny any source 2726 * that is not in the cache. 2727 */ 2728 if (error && sbif->bif_addrmax) 2729 goto drop; 2730 } 2731 2732 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2733 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2734 goto drop; 2735 2736 #ifdef DEV_NETMAP 2737 /* 2738 * Hand the packet to netmap only if it wasn't injected by netmap 2739 * itself. 2740 */ 2741 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2742 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2743 ifp->if_input(ifp, m); 2744 return; 2745 } 2746 m->m_flags &= ~M_BRIDGE_INJECT; 2747 #endif 2748 2749 /* 2750 * At this point, the port either doesn't participate 2751 * in spanning tree or it is in the forwarding state. 2752 */ 2753 2754 /* 2755 * If the packet is unicast, destined for someone on 2756 * "this" side of the bridge, drop it. 2757 */ 2758 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2759 dst_if = bridge_rtlookup(sc, dst, vlan); 2760 if (src_if == dst_if) 2761 goto drop; 2762 } else { 2763 /* 2764 * Check if its a reserved multicast address, any address 2765 * listed in 802.1D section 7.12.6 may not be forwarded by the 2766 * bridge. 2767 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2768 */ 2769 if (dst[0] == 0x01 && dst[1] == 0x80 && 2770 dst[2] == 0xc2 && dst[3] == 0x00 && 2771 dst[4] == 0x00 && dst[5] <= 0x0f) 2772 goto drop; 2773 2774 /* ...forward it to all interfaces. */ 2775 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2776 dst_if = NULL; 2777 } 2778 2779 /* 2780 * If we have a destination interface which is a member of our bridge, 2781 * OR this is a unicast packet, push it through the bpf(4) machinery. 2782 * For broadcast or multicast packets, don't bother because it will 2783 * be reinjected into ether_input. We do this before we pass the packets 2784 * through the pfil(9) framework, as it is possible that pfil(9) will 2785 * drop the packet, or possibly modify it, making it difficult to debug 2786 * firewall issues on the bridge. 2787 */ 2788 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2789 ETHER_BPF_MTAP(ifp, m); 2790 2791 /* run the packet filter */ 2792 if (PFIL_HOOKED_IN_46) { 2793 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2794 return; 2795 if (m == NULL) 2796 return; 2797 } 2798 2799 if (dst_if == NULL) { 2800 bridge_broadcast(sc, src_if, m, 1); 2801 return; 2802 } 2803 2804 /* 2805 * At this point, we're dealing with a unicast frame 2806 * going to a different interface. 2807 */ 2808 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2809 goto drop; 2810 2811 dbif = bridge_lookup_member_if(sc, dst_if); 2812 if (dbif == NULL) 2813 /* Not a member of the bridge (anymore?) */ 2814 goto drop; 2815 2816 /* Private segments can not talk to each other */ 2817 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2818 goto drop; 2819 2820 /* Do VLAN filtering. */ 2821 if (!bridge_vfilter_out(dbif, m)) 2822 goto drop; 2823 2824 if ((dbif->bif_flags & IFBIF_STP) && 2825 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2826 goto drop; 2827 2828 if (PFIL_HOOKED_OUT_46) { 2829 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2830 return; 2831 if (m == NULL) 2832 return; 2833 } 2834 2835 bridge_enqueue(sc, dst_if, m, dbif); 2836 return; 2837 2838 drop: 2839 m_freem(m); 2840 } 2841 2842 /* 2843 * bridge_input: 2844 * 2845 * Receive input from a member interface. Queue the packet for 2846 * bridging if it is not for us. 2847 */ 2848 static struct mbuf * 2849 bridge_input(struct ifnet *ifp, struct mbuf *m) 2850 { 2851 struct bridge_softc *sc = NULL; 2852 struct bridge_iflist *bif, *bif2; 2853 struct ifnet *bifp; 2854 struct ether_header *eh; 2855 struct mbuf *mc, *mc2; 2856 ether_vlanid_t vlan; 2857 int error; 2858 2859 NET_EPOCH_ASSERT(); 2860 2861 /* We need the Ethernet header later, so make sure we have it now. */ 2862 if (m->m_len < ETHER_HDR_LEN) { 2863 m = m_pullup(m, ETHER_HDR_LEN); 2864 if (m == NULL) { 2865 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2866 m_freem(m); 2867 return (NULL); 2868 } 2869 } 2870 2871 eh = mtod(m, struct ether_header *); 2872 vlan = VLANTAGOF(m); 2873 2874 /* 2875 * If this frame has a VLAN tag and the receiving interface has a 2876 * vlan(4) trunk, then it is is destined for vlan(4), not for us. 2877 * This means if vlan(4) and bridge(4) are configured on the same 2878 * interface, vlan(4) is preferred, which is what users typically 2879 * expect. 2880 */ 2881 if (vlan != DOT1Q_VID_NULL && ifp->if_vlantrunk != NULL) 2882 return (m); 2883 2884 bif = ifp->if_bridge; 2885 if (bif) 2886 sc = bif->bif_sc; 2887 2888 if (sc == NULL) { 2889 /* 2890 * This packet originated from the bridge itself, so it must 2891 * have been transmitted by netmap. Derive the "source" 2892 * interface from the source address and drop the packet if the 2893 * source address isn't known. 2894 */ 2895 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2896 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2897 sc = if_getsoftc(ifp); 2898 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2899 if (ifp == NULL) { 2900 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2901 m_freem(m); 2902 return (NULL); 2903 } 2904 m->m_pkthdr.rcvif = ifp; 2905 } 2906 bifp = sc->sc_ifp; 2907 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2908 return (m); 2909 2910 /* 2911 * Implement support for bridge monitoring. If this flag has been 2912 * set on this interface, discard the packet once we push it through 2913 * the bpf(4) machinery, but before we do, increment the byte and 2914 * packet counters associated with this interface. 2915 */ 2916 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2917 m->m_pkthdr.rcvif = bifp; 2918 ETHER_BPF_MTAP(bifp, m); 2919 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2920 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2921 m_freem(m); 2922 return (NULL); 2923 } 2924 2925 /* Do VLAN filtering. */ 2926 if (!bridge_vfilter_in(bif, m)) { 2927 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2928 m_freem(m); 2929 return (NULL); 2930 } 2931 /* bridge_vfilter_in() may add a tag */ 2932 vlan = VLANTAGOF(m); 2933 2934 bridge_span(sc, m); 2935 2936 if (m->m_flags & (M_BCAST|M_MCAST)) { 2937 /* Tap off 802.1D packets; they do not get forwarded. */ 2938 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2939 ETHER_ADDR_LEN) == 0) { 2940 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2941 return (NULL); 2942 } 2943 2944 if ((bif->bif_flags & IFBIF_STP) && 2945 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2946 return (m); 2947 } 2948 2949 /* 2950 * Make a deep copy of the packet and enqueue the copy 2951 * for bridge processing; return the original packet for 2952 * local processing. 2953 */ 2954 mc = m_dup(m, M_NOWAIT); 2955 if (mc == NULL) { 2956 return (m); 2957 } 2958 2959 /* Perform the bridge forwarding function with the copy. */ 2960 bridge_forward(sc, bif, mc); 2961 2962 #ifdef DEV_NETMAP 2963 /* 2964 * If netmap is enabled and has not already seen this packet, 2965 * then it will be consumed by bridge_forward(). 2966 */ 2967 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2968 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2969 m_freem(m); 2970 return (NULL); 2971 } 2972 #endif 2973 2974 /* 2975 * Reinject the mbuf as arriving on the bridge so we have a 2976 * chance at claiming multicast packets. We can not loop back 2977 * here from ether_input as a bridge is never a member of a 2978 * bridge. 2979 */ 2980 KASSERT(bifp->if_bridge == NULL, 2981 ("loop created in bridge_input")); 2982 mc2 = m_dup(m, M_NOWAIT); 2983 if (mc2 != NULL) { 2984 /* Keep the layer3 header aligned */ 2985 int i = min(mc2->m_pkthdr.len, max_protohdr); 2986 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2987 } 2988 if (mc2 != NULL) { 2989 mc2->m_pkthdr.rcvif = bifp; 2990 mc2->m_flags &= ~M_BRIDGE_INJECT; 2991 sc->sc_if_input(bifp, mc2); 2992 } 2993 2994 /* Return the original packet for local processing. */ 2995 return (m); 2996 } 2997 2998 if ((bif->bif_flags & IFBIF_STP) && 2999 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 3000 return (m); 3001 } 3002 3003 #if defined(INET) || defined(INET6) 3004 #define CARP_CHECK_WE_ARE_DST(iface) \ 3005 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 3006 #define CARP_CHECK_WE_ARE_SRC(iface) \ 3007 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 3008 #else 3009 #define CARP_CHECK_WE_ARE_DST(iface) false 3010 #define CARP_CHECK_WE_ARE_SRC(iface) false 3011 #endif 3012 3013 #ifdef DEV_NETMAP 3014 #define GRAB_FOR_NETMAP(ifp, m) do { \ 3015 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 3016 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 3017 (ifp)->if_input(ifp, m); \ 3018 return (NULL); \ 3019 } \ 3020 } while (0) 3021 #else 3022 #define GRAB_FOR_NETMAP(ifp, m) 3023 #endif 3024 3025 #define GRAB_OUR_PACKETS(iface) \ 3026 if ((iface)->if_type == IFT_GIF) \ 3027 continue; \ 3028 /* It is destined for us. */ \ 3029 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 3030 CARP_CHECK_WE_ARE_DST(iface)) { \ 3031 if (bif->bif_flags & IFBIF_LEARNING) { \ 3032 error = bridge_rtupdate(sc, eh->ether_shost, \ 3033 vlan, bif, 0, IFBAF_DYNAMIC); \ 3034 if (error && bif->bif_addrmax) { \ 3035 m_freem(m); \ 3036 return (NULL); \ 3037 } \ 3038 } \ 3039 m->m_pkthdr.rcvif = iface; \ 3040 if ((iface) == ifp) { \ 3041 /* Skip bridge processing... src == dest */ \ 3042 return (m); \ 3043 } \ 3044 /* It's passing over or to the bridge, locally. */ \ 3045 ETHER_BPF_MTAP(bifp, m); \ 3046 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 3047 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 3048 /* Hand the packet over to netmap if necessary. */ \ 3049 GRAB_FOR_NETMAP(bifp, m); \ 3050 /* Filter on the physical interface. */ \ 3051 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \ 3052 if (bridge_pfil(&m, NULL, ifp, \ 3053 PFIL_IN) != 0 || m == NULL) { \ 3054 return (NULL); \ 3055 } \ 3056 } \ 3057 if ((iface) != bifp) \ 3058 ETHER_BPF_MTAP(iface, m); \ 3059 /* Pass tagged packets to if_vlan, if it's loaded */ \ 3060 if (VLANTAGOF(m) != 0) { \ 3061 if (bifp->if_vlantrunk == NULL) { \ 3062 m_freem(m); \ 3063 return (NULL); \ 3064 } \ 3065 (*vlan_input_p)(bifp, m); \ 3066 return (NULL); \ 3067 } \ 3068 return (m); \ 3069 } \ 3070 \ 3071 /* We just received a packet that we sent out. */ \ 3072 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 3073 CARP_CHECK_WE_ARE_SRC(iface)) { \ 3074 m_freem(m); \ 3075 return (NULL); \ 3076 } 3077 3078 /* 3079 * Unicast. Make sure it's not for the bridge. 3080 */ 3081 do { GRAB_OUR_PACKETS(bifp) } while (0); 3082 3083 /* 3084 * If member_ifaddrs is enabled, see if the packet is destined for 3085 * one of the members' addresses. 3086 */ 3087 if (V_member_ifaddrs) { 3088 /* Check the interface the packet arrived on. */ 3089 do { GRAB_OUR_PACKETS(ifp) } while (0); 3090 3091 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 3092 GRAB_OUR_PACKETS(bif2->bif_ifp) 3093 } 3094 } 3095 3096 #undef CARP_CHECK_WE_ARE_DST 3097 #undef CARP_CHECK_WE_ARE_SRC 3098 #undef GRAB_FOR_NETMAP 3099 #undef GRAB_OUR_PACKETS 3100 3101 /* Perform the bridge forwarding function. */ 3102 bridge_forward(sc, bif, m); 3103 3104 return (NULL); 3105 } 3106 3107 /* 3108 * Inject a packet back into the host ethernet stack. This will generally only 3109 * be used by netmap when an application writes to the host TX ring. The 3110 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 3111 * interface after ethernet processing. 3112 */ 3113 static void 3114 bridge_inject(struct ifnet *ifp, struct mbuf *m) 3115 { 3116 struct bridge_softc *sc; 3117 3118 if (ifp->if_type == IFT_L2VLAN) { 3119 /* 3120 * vlan(4) gives us the vlan ifnet, so we need to get the 3121 * bridge softc to get a pointer to ether_input to send the 3122 * packet to. 3123 */ 3124 struct ifnet *bifp = NULL; 3125 3126 if (vlan_trunkdev_p == NULL) { 3127 m_freem(m); 3128 return; 3129 } 3130 3131 bifp = vlan_trunkdev_p(ifp); 3132 if (bifp == NULL) { 3133 m_freem(m); 3134 return; 3135 } 3136 3137 sc = if_getsoftc(bifp); 3138 sc->sc_if_input(ifp, m); 3139 return; 3140 } 3141 3142 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 3143 ("%s: iface %s is not running in netmap mode", 3144 __func__, if_name(ifp))); 3145 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 3146 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 3147 3148 m->m_flags |= M_BRIDGE_INJECT; 3149 sc = if_getsoftc(ifp); 3150 sc->sc_if_input(ifp, m); 3151 } 3152 3153 /* 3154 * bridge_broadcast: 3155 * 3156 * Send a frame to all interfaces that are members of 3157 * the bridge, except for the one on which the packet 3158 * arrived. 3159 * 3160 * NOTE: Releases the lock on return. 3161 */ 3162 static void 3163 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 3164 struct mbuf *m, int runfilt) 3165 { 3166 struct bridge_iflist *dbif, *sbif; 3167 struct mbuf *mc; 3168 struct ifnet *dst_if; 3169 int used = 0, i; 3170 3171 NET_EPOCH_ASSERT(); 3172 3173 sbif = bridge_lookup_member_if(sc, src_if); 3174 3175 /* Filter on the bridge interface before broadcasting */ 3176 if (runfilt && PFIL_HOOKED_OUT_46) { 3177 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 3178 return; 3179 if (m == NULL) 3180 return; 3181 } 3182 3183 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 3184 dst_if = dbif->bif_ifp; 3185 if (dst_if == src_if) 3186 continue; 3187 3188 /* Private segments can not talk to each other */ 3189 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 3190 continue; 3191 3192 /* Do VLAN filtering. */ 3193 if (!bridge_vfilter_out(dbif, m)) 3194 continue; 3195 3196 if ((dbif->bif_flags & IFBIF_STP) && 3197 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 3198 continue; 3199 3200 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 3201 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 3202 continue; 3203 3204 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3205 continue; 3206 3207 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 3208 mc = m; 3209 used = 1; 3210 } else { 3211 mc = m_dup(m, M_NOWAIT); 3212 if (mc == NULL) { 3213 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3214 continue; 3215 } 3216 } 3217 3218 /* 3219 * Filter on the output interface. Pass a NULL bridge interface 3220 * pointer so we do not redundantly filter on the bridge for 3221 * each interface we broadcast on. 3222 */ 3223 if (runfilt && PFIL_HOOKED_OUT_46) { 3224 if (used == 0) { 3225 /* Keep the layer3 header aligned */ 3226 i = min(mc->m_pkthdr.len, max_protohdr); 3227 mc = m_copyup(mc, i, ETHER_ALIGN); 3228 if (mc == NULL) { 3229 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3230 continue; 3231 } 3232 } 3233 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 3234 continue; 3235 if (mc == NULL) 3236 continue; 3237 } 3238 3239 bridge_enqueue(sc, dst_if, mc, dbif); 3240 } 3241 if (used == 0) 3242 m_freem(m); 3243 } 3244 3245 /* 3246 * bridge_span: 3247 * 3248 * Duplicate a packet out one or more interfaces that are in span mode, 3249 * the original mbuf is unmodified. 3250 */ 3251 static void 3252 bridge_span(struct bridge_softc *sc, struct mbuf *m) 3253 { 3254 struct bridge_iflist *bif; 3255 struct ifnet *dst_if; 3256 struct mbuf *mc; 3257 3258 NET_EPOCH_ASSERT(); 3259 3260 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 3261 return; 3262 3263 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 3264 dst_if = bif->bif_ifp; 3265 3266 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3267 continue; 3268 3269 mc = m_dup(m, M_NOWAIT); 3270 if (mc == NULL) { 3271 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3272 continue; 3273 } 3274 3275 bridge_enqueue(sc, dst_if, mc, bif); 3276 } 3277 } 3278 3279 /* 3280 * Incoming VLAN filtering. Given a frame and the member interface it was 3281 * received on, decide whether the port configuration allows it. 3282 */ 3283 static bool 3284 bridge_vfilter_in(const struct bridge_iflist *sbif, struct mbuf *m) 3285 { 3286 ether_vlanid_t vlan; 3287 3288 vlan = VLANTAGOF(m); 3289 /* Make sure the vlan id is reasonable. */ 3290 if (vlan > DOT1Q_VID_MAX) 3291 return (false); 3292 3293 /* 3294 * If VLAN filtering isn't enabled, pass everything, but add a tag 3295 * if the port has a pvid configured. 3296 */ 3297 if ((sbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) { 3298 if (vlan == DOT1Q_VID_NULL && 3299 sbif->bif_pvid != DOT1Q_VID_NULL) { 3300 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3301 m->m_flags |= M_VLANTAG; 3302 } 3303 3304 return (true); 3305 } 3306 3307 /* If Q-in-Q is disabled, check for stacked tags. */ 3308 if ((sbif->bif_flags & IFBIF_QINQ) == 0) { 3309 struct ether_header *eh; 3310 uint16_t proto; 3311 3312 eh = mtod(m, struct ether_header *); 3313 proto = ntohs(eh->ether_type); 3314 3315 if (proto == ETHERTYPE_VLAN || proto == ETHERTYPE_QINQ) 3316 return (false); 3317 } 3318 3319 if (vlan == DOT1Q_VID_NULL) { 3320 /* 3321 * The frame doesn't have a tag. If the interface does not 3322 * have an untagged vlan configured, drop the frame. 3323 */ 3324 if (sbif->bif_pvid == DOT1Q_VID_NULL) 3325 return (false); 3326 3327 /* 3328 * Otherwise, insert a new tag based on the interface's 3329 * untagged vlan id. 3330 */ 3331 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3332 m->m_flags |= M_VLANTAG; 3333 } else { 3334 /* 3335 * The frame has a tag, so check it matches the interface's 3336 * vlan access list. We explicitly do not accept tagged 3337 * frames for the untagged vlan id here (unless it's also 3338 * in the access list). 3339 */ 3340 if (!BRVLAN_TEST(&sbif->bif_vlan_set, vlan)) 3341 return (false); 3342 } 3343 3344 /* Accept the frame. */ 3345 return (true); 3346 } 3347 3348 /* 3349 * Outgoing VLAN filtering. Given a frame, its vlan, and the member interface 3350 * we intend to send it to, decide whether the port configuration allows it to 3351 * be sent. 3352 */ 3353 static bool 3354 bridge_vfilter_out(const struct bridge_iflist *dbif, const struct mbuf *m) 3355 { 3356 struct ether_header *eh; 3357 ether_vlanid_t vlan; 3358 3359 NET_EPOCH_ASSERT(); 3360 3361 /* If VLAN filtering isn't enabled, pass everything. */ 3362 if ((dbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) 3363 return (true); 3364 3365 vlan = VLANTAGOF(m); 3366 3367 /* 3368 * Always allow untagged 802.1D STP frames, even if they would 3369 * otherwise be dropped. This is required for STP to work on 3370 * a filtering bridge. 3371 * 3372 * Tagged STP (Cisco PVST+) is a non-standard extension, so 3373 * handle those frames via the normal filtering path. 3374 */ 3375 eh = mtod(m, struct ether_header *); 3376 if (vlan == DOT1Q_VID_NULL && 3377 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) 3378 return (true); 3379 3380 /* 3381 * If the frame wasn't assigned to a vlan at ingress, drop it. 3382 * We can't forward these frames to filtering ports because we 3383 * don't know what VLAN they're supposed to be in. 3384 */ 3385 if (vlan == DOT1Q_VID_NULL) 3386 return (false); 3387 3388 /* 3389 * If the frame's vlan matches the interfaces's untagged vlan, 3390 * allow it. 3391 */ 3392 if (vlan == dbif->bif_pvid) 3393 return (true); 3394 3395 /* 3396 * If the frame's vlan is on the interface's tagged access list, 3397 * allow it. 3398 */ 3399 if (BRVLAN_TEST(&dbif->bif_vlan_set, vlan)) 3400 return (true); 3401 3402 /* The frame was not permitted, so drop it. */ 3403 return (false); 3404 } 3405 3406 /* 3407 * bridge_rtupdate: 3408 * 3409 * Add a bridge routing entry. 3410 */ 3411 static int 3412 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 3413 ether_vlanid_t vlan, struct bridge_iflist *bif, 3414 int setflags, uint8_t flags) 3415 { 3416 struct bridge_rtnode *brt; 3417 struct bridge_iflist *obif; 3418 int error; 3419 3420 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3421 3422 /* Check the source address is valid and not multicast. */ 3423 if (ETHER_IS_MULTICAST(dst)) 3424 return (EXTERROR(EINVAL, "Multicast address not permitted")); 3425 if (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 3426 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) 3427 return (EXTERROR(EINVAL, "Zero address not permitted")); 3428 3429 /* 3430 * A route for this destination might already exist. If so, 3431 * update it, otherwise create a new one. 3432 */ 3433 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 3434 BRIDGE_RT_LOCK(sc); 3435 3436 /* Check again, now that we have the lock. There could have 3437 * been a race and we only want to insert this once. */ 3438 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 3439 BRIDGE_RT_UNLOCK(sc); 3440 return (0); 3441 } 3442 3443 if (sc->sc_brtcnt >= sc->sc_brtmax) { 3444 sc->sc_brtexceeded++; 3445 BRIDGE_RT_UNLOCK(sc); 3446 return (EXTERROR(ENOSPC, "Address table is full")); 3447 } 3448 /* Check per interface address limits (if enabled) */ 3449 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 3450 bif->bif_addrexceeded++; 3451 BRIDGE_RT_UNLOCK(sc); 3452 return (EXTERROR(ENOSPC, 3453 "Interface address limit exceeded")); 3454 } 3455 3456 /* 3457 * Allocate a new bridge forwarding node, and 3458 * initialize the expiration time and Ethernet 3459 * address. 3460 */ 3461 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 3462 if (brt == NULL) { 3463 BRIDGE_RT_UNLOCK(sc); 3464 return (EXTERROR(ENOMEM, 3465 "Cannot allocate address node")); 3466 } 3467 brt->brt_vnet = curvnet; 3468 3469 if (bif->bif_flags & IFBIF_STICKY) 3470 brt->brt_flags = IFBAF_STICKY; 3471 else 3472 brt->brt_flags = IFBAF_DYNAMIC; 3473 3474 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 3475 brt->brt_vlan = vlan; 3476 3477 brt->brt_dst = bif; 3478 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 3479 uma_zfree(V_bridge_rtnode_zone, brt); 3480 BRIDGE_RT_UNLOCK(sc); 3481 return (error); 3482 } 3483 bif->bif_addrcnt++; 3484 3485 BRIDGE_RT_UNLOCK(sc); 3486 } 3487 3488 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 3489 (obif = brt->brt_dst) != bif) { 3490 MPASS(obif != NULL); 3491 3492 BRIDGE_RT_LOCK(sc); 3493 brt->brt_dst->bif_addrcnt--; 3494 brt->brt_dst = bif; 3495 brt->brt_dst->bif_addrcnt++; 3496 BRIDGE_RT_UNLOCK(sc); 3497 3498 if (V_log_mac_flap && 3499 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 3500 log(LOG_NOTICE, 3501 "%s: mac address %6D vlan %d moved from %s to %s\n", 3502 sc->sc_ifp->if_xname, 3503 &brt->brt_addr[0], ":", 3504 brt->brt_vlan, 3505 obif->bif_ifp->if_xname, 3506 bif->bif_ifp->if_xname); 3507 } 3508 } 3509 3510 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3511 brt->brt_expire = time_uptime + sc->sc_brttimeout; 3512 if (setflags) 3513 brt->brt_flags = flags; 3514 3515 return (0); 3516 } 3517 3518 /* 3519 * bridge_rtlookup: 3520 * 3521 * Lookup the destination interface for an address. 3522 */ 3523 static struct ifnet * 3524 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, 3525 ether_vlanid_t vlan) 3526 { 3527 struct bridge_rtnode *brt; 3528 3529 NET_EPOCH_ASSERT(); 3530 3531 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 3532 return (NULL); 3533 3534 return (brt->brt_ifp); 3535 } 3536 3537 /* 3538 * bridge_rttrim: 3539 * 3540 * Trim the routine table so that we have a number 3541 * of routing entries less than or equal to the 3542 * maximum number. 3543 */ 3544 static void 3545 bridge_rttrim(struct bridge_softc *sc) 3546 { 3547 struct bridge_rtnode *brt, *nbrt; 3548 3549 NET_EPOCH_ASSERT(); 3550 BRIDGE_RT_LOCK_ASSERT(sc); 3551 3552 /* Make sure we actually need to do this. */ 3553 if (sc->sc_brtcnt <= sc->sc_brtmax) 3554 return; 3555 3556 /* Force an aging cycle; this might trim enough addresses. */ 3557 bridge_rtage(sc); 3558 if (sc->sc_brtcnt <= sc->sc_brtmax) 3559 return; 3560 3561 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3562 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3563 bridge_rtnode_destroy(sc, brt); 3564 if (sc->sc_brtcnt <= sc->sc_brtmax) 3565 return; 3566 } 3567 } 3568 } 3569 3570 /* 3571 * bridge_timer: 3572 * 3573 * Aging timer for the bridge. 3574 */ 3575 static void 3576 bridge_timer(void *arg) 3577 { 3578 struct bridge_softc *sc = arg; 3579 3580 BRIDGE_RT_LOCK_ASSERT(sc); 3581 3582 /* Destruction of rtnodes requires a proper vnet context */ 3583 CURVNET_SET(sc->sc_ifp->if_vnet); 3584 bridge_rtage(sc); 3585 3586 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3587 callout_reset(&sc->sc_brcallout, 3588 bridge_rtable_prune_period * hz, bridge_timer, sc); 3589 CURVNET_RESTORE(); 3590 } 3591 3592 /* 3593 * bridge_rtage: 3594 * 3595 * Perform an aging cycle. 3596 */ 3597 static void 3598 bridge_rtage(struct bridge_softc *sc) 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_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3606 if (time_uptime >= brt->brt_expire) 3607 bridge_rtnode_destroy(sc, brt); 3608 } 3609 } 3610 } 3611 3612 /* 3613 * bridge_rtflush: 3614 * 3615 * Remove all dynamic addresses from the bridge. 3616 */ 3617 static void 3618 bridge_rtflush(struct bridge_softc *sc, int full) 3619 { 3620 struct bridge_rtnode *brt, *nbrt; 3621 3622 BRIDGE_RT_LOCK_ASSERT(sc); 3623 3624 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3625 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3626 bridge_rtnode_destroy(sc, brt); 3627 } 3628 } 3629 3630 /* 3631 * bridge_rtdaddr: 3632 * 3633 * Remove an address from the table. 3634 */ 3635 static int 3636 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, 3637 ether_vlanid_t vlan) 3638 { 3639 struct bridge_rtnode *brt; 3640 int found = 0; 3641 3642 BRIDGE_RT_LOCK(sc); 3643 3644 /* 3645 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans 3646 * so the lookup may return more than one. 3647 */ 3648 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3649 bridge_rtnode_destroy(sc, brt); 3650 found = 1; 3651 } 3652 3653 BRIDGE_RT_UNLOCK(sc); 3654 3655 return (found ? 0 : ENOENT); 3656 } 3657 3658 /* 3659 * bridge_rtdelete: 3660 * 3661 * Delete routes to a speicifc member interface. 3662 */ 3663 static void 3664 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3665 { 3666 struct bridge_rtnode *brt, *nbrt; 3667 3668 BRIDGE_RT_LOCK_ASSERT(sc); 3669 3670 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3671 if (brt->brt_ifp == ifp && (full || 3672 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3673 bridge_rtnode_destroy(sc, brt); 3674 } 3675 } 3676 3677 /* 3678 * bridge_rtable_init: 3679 * 3680 * Initialize the route table for this bridge. 3681 */ 3682 static void 3683 bridge_rtable_init(struct bridge_softc *sc) 3684 { 3685 int i; 3686 3687 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3688 M_DEVBUF, M_WAITOK); 3689 3690 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3691 CK_LIST_INIT(&sc->sc_rthash[i]); 3692 3693 sc->sc_rthash_key = arc4random(); 3694 CK_LIST_INIT(&sc->sc_rtlist); 3695 } 3696 3697 /* 3698 * bridge_rtable_fini: 3699 * 3700 * Deconstruct the route table for this bridge. 3701 */ 3702 static void 3703 bridge_rtable_fini(struct bridge_softc *sc) 3704 { 3705 3706 KASSERT(sc->sc_brtcnt == 0, 3707 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3708 free(sc->sc_rthash, M_DEVBUF); 3709 } 3710 3711 /* 3712 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3713 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3714 */ 3715 #define mix(a, b, c) \ 3716 do { \ 3717 a -= b; a -= c; a ^= (c >> 13); \ 3718 b -= c; b -= a; b ^= (a << 8); \ 3719 c -= a; c -= b; c ^= (b >> 13); \ 3720 a -= b; a -= c; a ^= (c >> 12); \ 3721 b -= c; b -= a; b ^= (a << 16); \ 3722 c -= a; c -= b; c ^= (b >> 5); \ 3723 a -= b; a -= c; a ^= (c >> 3); \ 3724 b -= c; b -= a; b ^= (a << 10); \ 3725 c -= a; c -= b; c ^= (b >> 15); \ 3726 } while (/*CONSTCOND*/0) 3727 3728 static __inline uint32_t 3729 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3730 { 3731 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3732 3733 b += addr[5] << 8; 3734 b += addr[4]; 3735 a += addr[3] << 24; 3736 a += addr[2] << 16; 3737 a += addr[1] << 8; 3738 a += addr[0]; 3739 3740 mix(a, b, c); 3741 3742 return (c & BRIDGE_RTHASH_MASK); 3743 } 3744 3745 #undef mix 3746 3747 static int 3748 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3749 { 3750 int i, d; 3751 3752 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3753 d = ((int)a[i]) - ((int)b[i]); 3754 } 3755 3756 return (d); 3757 } 3758 3759 /* 3760 * bridge_rtnode_lookup: 3761 * 3762 * Look up a bridge route node for the specified destination. Compare the 3763 * vlan id or if zero then just return the first match. 3764 */ 3765 static struct bridge_rtnode * 3766 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, 3767 ether_vlanid_t vlan) 3768 { 3769 struct bridge_rtnode *brt; 3770 uint32_t hash; 3771 int dir; 3772 3773 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3774 3775 hash = bridge_rthash(sc, addr); 3776 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3777 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3778 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL)) 3779 return (brt); 3780 if (dir > 0) 3781 return (NULL); 3782 } 3783 3784 return (NULL); 3785 } 3786 3787 /* 3788 * bridge_rtnode_insert: 3789 * 3790 * Insert the specified bridge node into the route table. We 3791 * assume the entry is not already in the table. 3792 */ 3793 static int 3794 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3795 { 3796 struct bridge_rtnode *lbrt; 3797 uint32_t hash; 3798 int dir; 3799 3800 BRIDGE_RT_LOCK_ASSERT(sc); 3801 3802 hash = bridge_rthash(sc, brt->brt_addr); 3803 3804 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3805 if (lbrt == NULL) { 3806 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3807 goto out; 3808 } 3809 3810 do { 3811 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3812 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3813 return (EXTERROR(EEXIST, "Address already exists")); 3814 if (dir > 0) { 3815 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3816 goto out; 3817 } 3818 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3819 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3820 goto out; 3821 } 3822 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3823 } while (lbrt != NULL); 3824 3825 #ifdef DIAGNOSTIC 3826 panic("bridge_rtnode_insert: impossible"); 3827 #endif 3828 3829 out: 3830 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3831 sc->sc_brtcnt++; 3832 3833 return (0); 3834 } 3835 3836 static void 3837 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3838 { 3839 struct bridge_rtnode *brt; 3840 3841 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3842 3843 CURVNET_SET(brt->brt_vnet); 3844 uma_zfree(V_bridge_rtnode_zone, brt); 3845 CURVNET_RESTORE(); 3846 } 3847 3848 /* 3849 * bridge_rtnode_destroy: 3850 * 3851 * Destroy a bridge rtnode. 3852 */ 3853 static void 3854 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3855 { 3856 BRIDGE_RT_LOCK_ASSERT(sc); 3857 3858 CK_LIST_REMOVE(brt, brt_hash); 3859 3860 CK_LIST_REMOVE(brt, brt_list); 3861 sc->sc_brtcnt--; 3862 brt->brt_dst->bif_addrcnt--; 3863 3864 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3865 } 3866 3867 /* 3868 * bridge_rtable_expire: 3869 * 3870 * Set the expiry time for all routes on an interface. 3871 */ 3872 static void 3873 bridge_rtable_expire(struct ifnet *ifp, int age) 3874 { 3875 struct bridge_iflist *bif = NULL; 3876 struct bridge_softc *sc = NULL; 3877 struct bridge_rtnode *brt; 3878 3879 CURVNET_SET(ifp->if_vnet); 3880 3881 bif = ifp->if_bridge; 3882 if (bif) 3883 sc = bif->bif_sc; 3884 MPASS(sc != NULL); 3885 BRIDGE_RT_LOCK(sc); 3886 3887 /* 3888 * If the age is zero then flush, otherwise set all the expiry times to 3889 * age for the interface 3890 */ 3891 if (age == 0) 3892 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3893 else { 3894 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3895 /* Cap the expiry time to 'age' */ 3896 if (brt->brt_ifp == ifp && 3897 brt->brt_expire > time_uptime + age && 3898 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3899 brt->brt_expire = time_uptime + age; 3900 } 3901 } 3902 BRIDGE_RT_UNLOCK(sc); 3903 CURVNET_RESTORE(); 3904 } 3905 3906 /* 3907 * bridge_state_change: 3908 * 3909 * Callback from the bridgestp code when a port changes states. 3910 */ 3911 static void 3912 bridge_state_change(struct ifnet *ifp, int state) 3913 { 3914 struct bridge_iflist *bif = ifp->if_bridge; 3915 struct bridge_softc *sc = bif->bif_sc; 3916 static const char *stpstates[] = { 3917 "disabled", 3918 "listening", 3919 "learning", 3920 "forwarding", 3921 "blocking", 3922 "discarding" 3923 }; 3924 3925 CURVNET_SET(ifp->if_vnet); 3926 if (V_log_stp) 3927 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3928 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3929 CURVNET_RESTORE(); 3930 } 3931 3932 /* 3933 * Send bridge packets through pfil if they are one of the types pfil can deal 3934 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3935 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3936 * that interface. 3937 */ 3938 static int 3939 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3940 { 3941 int snap, error, i; 3942 struct ether_header *eh1, eh2; 3943 struct llc llc1; 3944 u_int16_t ether_type; 3945 pfil_return_t rv; 3946 #ifdef INET 3947 struct ip *ip = NULL; 3948 int hlen = 0; 3949 #endif 3950 3951 snap = 0; 3952 error = -1; /* Default error if not error == 0 */ 3953 3954 #if 0 3955 /* we may return with the IP fields swapped, ensure its not shared */ 3956 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3957 #endif 3958 3959 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3960 return (0); /* filtering is disabled */ 3961 3962 i = min((*mp)->m_pkthdr.len, max_protohdr); 3963 if ((*mp)->m_len < i) { 3964 *mp = m_pullup(*mp, i); 3965 if (*mp == NULL) { 3966 printf("%s: m_pullup failed\n", __func__); 3967 return (-1); 3968 } 3969 } 3970 3971 eh1 = mtod(*mp, struct ether_header *); 3972 ether_type = ntohs(eh1->ether_type); 3973 3974 /* 3975 * Check for SNAP/LLC. 3976 */ 3977 if (ether_type < ETHERMTU) { 3978 struct llc *llc2 = (struct llc *)(eh1 + 1); 3979 3980 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3981 llc2->llc_dsap == LLC_SNAP_LSAP && 3982 llc2->llc_ssap == LLC_SNAP_LSAP && 3983 llc2->llc_control == LLC_UI) { 3984 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3985 snap = 1; 3986 } 3987 } 3988 3989 /* 3990 * If we're trying to filter bridge traffic, only look at traffic for 3991 * protocols available in the kernel (IPv4 and/or IPv6) to avoid 3992 * passing traffic for an unsupported protocol to the filter. This is 3993 * lame since if we really wanted, say, an AppleTalk filter, we are 3994 * hosed, but of course we don't have an AppleTalk filter to begin 3995 * with. (Note that since pfil doesn't understand ARP it will pass 3996 * *ALL* ARP traffic.) 3997 */ 3998 switch (ether_type) { 3999 #ifdef INET 4000 case ETHERTYPE_ARP: 4001 case ETHERTYPE_REVARP: 4002 if (V_pfil_ipfw_arp == 0) 4003 return (0); /* Automatically pass */ 4004 4005 /* FALLTHROUGH */ 4006 case ETHERTYPE_IP: 4007 #endif 4008 #ifdef INET6 4009 case ETHERTYPE_IPV6: 4010 #endif /* INET6 */ 4011 break; 4012 4013 default: 4014 /* 4015 * We get here if the packet isn't from a supported 4016 * protocol. Check to see if the user wants to pass 4017 * non-IP packets, these will not be checked by pfil(9) 4018 * and passed unconditionally so the default is to 4019 * drop. 4020 */ 4021 if (V_pfil_onlyip) 4022 goto bad; 4023 } 4024 4025 /* Run the packet through pfil before stripping link headers */ 4026 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 4027 dir == PFIL_OUT && ifp != NULL) { 4028 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 4029 case PFIL_DROPPED: 4030 return (EACCES); 4031 case PFIL_CONSUMED: 4032 return (0); 4033 } 4034 } 4035 4036 /* Strip off the Ethernet header and keep a copy. */ 4037 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 4038 m_adj(*mp, ETHER_HDR_LEN); 4039 4040 /* Strip off snap header, if present */ 4041 if (snap) { 4042 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 4043 m_adj(*mp, sizeof(struct llc)); 4044 } 4045 4046 /* 4047 * Check the IP header for alignment and errors 4048 */ 4049 if (dir == PFIL_IN) { 4050 switch (ether_type) { 4051 #ifdef INET 4052 case ETHERTYPE_IP: 4053 error = bridge_ip_checkbasic(mp); 4054 break; 4055 #endif 4056 #ifdef INET6 4057 case ETHERTYPE_IPV6: 4058 error = bridge_ip6_checkbasic(mp); 4059 break; 4060 #endif /* INET6 */ 4061 default: 4062 error = 0; 4063 } 4064 if (error) 4065 goto bad; 4066 } 4067 4068 error = 0; 4069 4070 /* 4071 * Run the packet through pfil 4072 */ 4073 rv = PFIL_PASS; 4074 switch (ether_type) { 4075 #ifdef INET 4076 case ETHERTYPE_IP: 4077 /* 4078 * Run pfil on the member interface and the bridge, both can 4079 * be skipped by clearing pfil_member or pfil_bridge. 4080 * 4081 * Keep the order: 4082 * in_if -> bridge_if -> out_if 4083 */ 4084 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4085 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 4086 PFIL_PASS) 4087 break; 4088 4089 if (V_pfil_member && ifp != NULL) { 4090 rv = (dir == PFIL_OUT) ? 4091 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 4092 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 4093 if (rv != PFIL_PASS) 4094 break; 4095 } 4096 4097 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4098 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 4099 PFIL_PASS) 4100 break; 4101 4102 /* check if we need to fragment the packet */ 4103 /* bridge_fragment generates a mbuf chain of packets */ 4104 /* that already include eth headers */ 4105 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 4106 i = (*mp)->m_pkthdr.len; 4107 if (i > ifp->if_mtu) { 4108 error = bridge_fragment(ifp, mp, &eh2, snap, 4109 &llc1); 4110 return (error); 4111 } 4112 } 4113 4114 /* Recalculate the ip checksum. */ 4115 ip = mtod(*mp, struct ip *); 4116 hlen = ip->ip_hl << 2; 4117 if (hlen < sizeof(struct ip)) 4118 goto bad; 4119 if (hlen > (*mp)->m_len) { 4120 if ((*mp = m_pullup(*mp, hlen)) == NULL) 4121 goto bad; 4122 ip = mtod(*mp, struct ip *); 4123 if (ip == NULL) 4124 goto bad; 4125 } 4126 ip->ip_sum = 0; 4127 if (hlen == sizeof(struct ip)) 4128 ip->ip_sum = in_cksum_hdr(ip); 4129 else 4130 ip->ip_sum = in_cksum(*mp, hlen); 4131 4132 break; 4133 #endif /* INET */ 4134 #ifdef INET6 4135 case ETHERTYPE_IPV6: 4136 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4137 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 4138 PFIL_PASS) 4139 break; 4140 4141 if (V_pfil_member && ifp != NULL) { 4142 rv = (dir == PFIL_OUT) ? 4143 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 4144 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 4145 if (rv != PFIL_PASS) 4146 break; 4147 } 4148 4149 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4150 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 4151 PFIL_PASS) 4152 break; 4153 break; 4154 #endif 4155 } 4156 4157 switch (rv) { 4158 case PFIL_CONSUMED: 4159 return (0); 4160 case PFIL_DROPPED: 4161 return (EACCES); 4162 default: 4163 break; 4164 } 4165 4166 error = -1; 4167 4168 /* 4169 * Finally, put everything back the way it was and return 4170 */ 4171 if (snap) { 4172 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 4173 if (*mp == NULL) 4174 return (error); 4175 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 4176 } 4177 4178 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 4179 if (*mp == NULL) 4180 return (error); 4181 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 4182 4183 return (0); 4184 4185 bad: 4186 m_freem(*mp); 4187 *mp = NULL; 4188 return (error); 4189 } 4190 4191 #ifdef INET 4192 /* 4193 * Perform basic checks on header size since 4194 * pfil assumes ip_input has already processed 4195 * it for it. Cut-and-pasted from ip_input.c. 4196 * Given how simple the IPv6 version is, 4197 * does the IPv4 version really need to be 4198 * this complicated? 4199 * 4200 * XXX Should we update ipstat here, or not? 4201 * XXX Right now we update ipstat but not 4202 * XXX csum_counter. 4203 */ 4204 static int 4205 bridge_ip_checkbasic(struct mbuf **mp) 4206 { 4207 struct mbuf *m = *mp; 4208 struct ip *ip; 4209 int len, hlen; 4210 u_short sum; 4211 4212 if (*mp == NULL) 4213 return (-1); 4214 4215 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4216 if ((m = m_copyup(m, sizeof(struct ip), 4217 (max_linkhdr + 3) & ~3)) == NULL) { 4218 /* XXXJRT new stat, please */ 4219 KMOD_IPSTAT_INC(ips_toosmall); 4220 goto bad; 4221 } 4222 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 4223 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 4224 KMOD_IPSTAT_INC(ips_toosmall); 4225 goto bad; 4226 } 4227 } 4228 ip = mtod(m, struct ip *); 4229 if (ip == NULL) goto bad; 4230 4231 if (ip->ip_v != IPVERSION) { 4232 KMOD_IPSTAT_INC(ips_badvers); 4233 goto bad; 4234 } 4235 hlen = ip->ip_hl << 2; 4236 if (hlen < sizeof(struct ip)) { /* minimum header length */ 4237 KMOD_IPSTAT_INC(ips_badhlen); 4238 goto bad; 4239 } 4240 if (hlen > m->m_len) { 4241 if ((m = m_pullup(m, hlen)) == NULL) { 4242 KMOD_IPSTAT_INC(ips_badhlen); 4243 goto bad; 4244 } 4245 ip = mtod(m, struct ip *); 4246 if (ip == NULL) goto bad; 4247 } 4248 4249 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 4250 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 4251 } else { 4252 if (hlen == sizeof(struct ip)) { 4253 sum = in_cksum_hdr(ip); 4254 } else { 4255 sum = in_cksum(m, hlen); 4256 } 4257 } 4258 if (sum) { 4259 KMOD_IPSTAT_INC(ips_badsum); 4260 goto bad; 4261 } 4262 4263 /* Retrieve the packet length. */ 4264 len = ntohs(ip->ip_len); 4265 4266 /* 4267 * Check for additional length bogosity 4268 */ 4269 if (len < hlen) { 4270 KMOD_IPSTAT_INC(ips_badlen); 4271 goto bad; 4272 } 4273 4274 /* 4275 * Check that the amount of data in the buffers 4276 * is as at least much as the IP header would have us expect. 4277 * Drop packet if shorter than we expect. 4278 */ 4279 if (m->m_pkthdr.len < len) { 4280 KMOD_IPSTAT_INC(ips_tooshort); 4281 goto bad; 4282 } 4283 4284 /* Checks out, proceed */ 4285 *mp = m; 4286 return (0); 4287 4288 bad: 4289 *mp = m; 4290 return (-1); 4291 } 4292 #endif /* INET */ 4293 4294 #ifdef INET6 4295 /* 4296 * Same as above, but for IPv6. 4297 * Cut-and-pasted from ip6_input.c. 4298 * XXX Should we update ip6stat, or not? 4299 */ 4300 static int 4301 bridge_ip6_checkbasic(struct mbuf **mp) 4302 { 4303 struct mbuf *m = *mp; 4304 struct ip6_hdr *ip6; 4305 4306 /* 4307 * If the IPv6 header is not aligned, slurp it up into a new 4308 * mbuf with space for link headers, in the event we forward 4309 * it. Otherwise, if it is aligned, make sure the entire base 4310 * IPv6 header is in the first mbuf of the chain. 4311 */ 4312 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4313 struct ifnet *inifp = m->m_pkthdr.rcvif; 4314 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 4315 (max_linkhdr + 3) & ~3)) == NULL) { 4316 /* XXXJRT new stat, please */ 4317 IP6STAT_INC(ip6s_toosmall); 4318 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4319 goto bad; 4320 } 4321 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 4322 struct ifnet *inifp = m->m_pkthdr.rcvif; 4323 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 4324 IP6STAT_INC(ip6s_toosmall); 4325 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4326 goto bad; 4327 } 4328 } 4329 4330 ip6 = mtod(m, struct ip6_hdr *); 4331 4332 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 4333 IP6STAT_INC(ip6s_badvers); 4334 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 4335 goto bad; 4336 } 4337 4338 /* Checks out, proceed */ 4339 *mp = m; 4340 return (0); 4341 4342 bad: 4343 *mp = m; 4344 return (-1); 4345 } 4346 #endif /* INET6 */ 4347 4348 #ifdef INET 4349 /* 4350 * bridge_fragment: 4351 * 4352 * Fragment mbuf chain in multiple packets and prepend ethernet header. 4353 */ 4354 static int 4355 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 4356 int snap, struct llc *llc) 4357 { 4358 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 4359 struct ip *ip; 4360 int error = -1; 4361 4362 if (m->m_len < sizeof(struct ip) && 4363 (m = m_pullup(m, sizeof(struct ip))) == NULL) 4364 goto dropit; 4365 ip = mtod(m, struct ip *); 4366 4367 m->m_pkthdr.csum_flags |= CSUM_IP; 4368 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 4369 if (error) 4370 goto dropit; 4371 4372 /* 4373 * Walk the chain and re-add the Ethernet header for 4374 * each mbuf packet. 4375 */ 4376 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 4377 nextpkt = mcur->m_nextpkt; 4378 mcur->m_nextpkt = NULL; 4379 if (snap) { 4380 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 4381 if (mcur == NULL) { 4382 error = ENOBUFS; 4383 if (mprev != NULL) 4384 mprev->m_nextpkt = nextpkt; 4385 goto dropit; 4386 } 4387 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 4388 } 4389 4390 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 4391 if (mcur == NULL) { 4392 error = ENOBUFS; 4393 if (mprev != NULL) 4394 mprev->m_nextpkt = nextpkt; 4395 goto dropit; 4396 } 4397 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 4398 4399 /* 4400 * The previous two M_PREPEND could have inserted one or two 4401 * mbufs in front so we have to update the previous packet's 4402 * m_nextpkt. 4403 */ 4404 mcur->m_nextpkt = nextpkt; 4405 if (mprev != NULL) 4406 mprev->m_nextpkt = mcur; 4407 else { 4408 /* The first mbuf in the original chain needs to be 4409 * updated. */ 4410 *mp = mcur; 4411 } 4412 mprev = mcur; 4413 } 4414 4415 KMOD_IPSTAT_INC(ips_fragmented); 4416 return (error); 4417 4418 dropit: 4419 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 4420 m = mcur->m_nextpkt; 4421 m_freem(mcur); 4422 } 4423 return (error); 4424 } 4425 #endif /* INET */ 4426 4427 static void 4428 bridge_linkstate(struct ifnet *ifp) 4429 { 4430 struct bridge_softc *sc = NULL; 4431 struct bridge_iflist *bif; 4432 struct epoch_tracker et; 4433 4434 NET_EPOCH_ENTER(et); 4435 4436 bif = ifp->if_bridge; 4437 if (bif) 4438 sc = bif->bif_sc; 4439 4440 if (sc != NULL) { 4441 bridge_linkcheck(sc); 4442 bstp_linkstate(&bif->bif_stp); 4443 } 4444 4445 NET_EPOCH_EXIT(et); 4446 } 4447 4448 static void 4449 bridge_linkcheck(struct bridge_softc *sc) 4450 { 4451 struct bridge_iflist *bif; 4452 int new_link, hasls; 4453 4454 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 4455 4456 new_link = LINK_STATE_DOWN; 4457 hasls = 0; 4458 /* Our link is considered up if at least one of our ports is active */ 4459 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 4460 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 4461 hasls++; 4462 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 4463 new_link = LINK_STATE_UP; 4464 break; 4465 } 4466 } 4467 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 4468 /* If no interfaces support link-state then we default to up */ 4469 new_link = LINK_STATE_UP; 4470 } 4471 if_link_state_change(sc->sc_ifp, new_link); 4472 } 4473