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 interface with 1451 * assigned IP addresses to be added to a bridge. 1452 */ 1453 if (!V_member_ifaddrs) { 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 if (sc->sc_flags & IFBRF_VLANFILTER) 1504 bif->bif_pvid = sc->sc_defpvid; 1505 if (sc->sc_flags & IFBRF_DEFQINQ) 1506 bif->bif_flags |= IFBIF_QINQ; 1507 1508 /* 1509 * Assign the interface's MAC address to the bridge if it's the first 1510 * member and the MAC address of the bridge has not been changed from 1511 * the default randomly generated one. 1512 */ 1513 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1514 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1515 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1516 sc->sc_ifaddr = ifs; 1517 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1518 } 1519 1520 ifs->if_bridge = bif; 1521 ifs->if_bridge_output = bridge_output; 1522 ifs->if_bridge_input = bridge_input; 1523 ifs->if_bridge_linkstate = bridge_linkstate; 1524 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1525 /* 1526 * XXX: XLOCK HERE!?! 1527 * 1528 * NOTE: insert_***HEAD*** should be safe for the traversals. 1529 */ 1530 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1531 1532 /* Set interface capabilities to the intersection set of all members */ 1533 bridge_mutecaps(sc); 1534 bridge_linkcheck(sc); 1535 1536 /* Place the interface into promiscuous mode */ 1537 switch (ifs->if_type) { 1538 case IFT_ETHER: 1539 case IFT_L2VLAN: 1540 error = ifpromisc(ifs, 1); 1541 break; 1542 } 1543 1544 if (error) 1545 bridge_delete_member(sc, bif, 0); 1546 return (error); 1547 } 1548 1549 static int 1550 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1551 { 1552 struct ifbreq *req = arg; 1553 struct bridge_iflist *bif; 1554 1555 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1556 if (bif == NULL) 1557 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1558 1559 bridge_delete_member(sc, bif, 0); 1560 1561 return (0); 1562 } 1563 1564 static int 1565 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1566 { 1567 struct ifbreq *req = arg; 1568 struct bridge_iflist *bif; 1569 struct bstp_port *bp; 1570 1571 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1572 if (bif == NULL) 1573 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1574 1575 bp = &bif->bif_stp; 1576 req->ifbr_ifsflags = bif->bif_flags; 1577 req->ifbr_state = bp->bp_state; 1578 req->ifbr_priority = bp->bp_priority; 1579 req->ifbr_path_cost = bp->bp_path_cost; 1580 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1581 req->ifbr_proto = bp->bp_protover; 1582 req->ifbr_role = bp->bp_role; 1583 req->ifbr_stpflags = bp->bp_flags; 1584 req->ifbr_addrcnt = bif->bif_addrcnt; 1585 req->ifbr_addrmax = bif->bif_addrmax; 1586 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1587 req->ifbr_pvid = bif->bif_pvid; 1588 req->ifbr_vlanproto = bif->bif_vlanproto; 1589 1590 /* Copy STP state options as flags */ 1591 if (bp->bp_operedge) 1592 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1593 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1594 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1595 if (bp->bp_ptp_link) 1596 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1597 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1598 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1599 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1600 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1601 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1602 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1603 return (0); 1604 } 1605 1606 static int 1607 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1608 { 1609 struct epoch_tracker et; 1610 struct ifbreq *req = arg; 1611 struct bridge_iflist *bif; 1612 struct bstp_port *bp; 1613 int error; 1614 1615 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1616 if (bif == NULL) 1617 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1618 bp = &bif->bif_stp; 1619 1620 if (req->ifbr_ifsflags & IFBIF_SPAN) 1621 /* SPAN is readonly */ 1622 return (EXTERROR(EINVAL, "Span interface cannot be modified")); 1623 1624 NET_EPOCH_ENTER(et); 1625 1626 if (req->ifbr_ifsflags & IFBIF_STP) { 1627 if ((bif->bif_flags & IFBIF_STP) == 0) { 1628 error = bstp_enable(&bif->bif_stp); 1629 if (error) { 1630 NET_EPOCH_EXIT(et); 1631 return (EXTERROR(error, 1632 "Failed to enable STP")); 1633 } 1634 } 1635 } else { 1636 if ((bif->bif_flags & IFBIF_STP) != 0) 1637 bstp_disable(&bif->bif_stp); 1638 } 1639 1640 /* Pass on STP flags */ 1641 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1642 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1643 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1644 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1645 1646 /* Save the bits relating to the bridge */ 1647 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1648 1649 NET_EPOCH_EXIT(et); 1650 1651 return (0); 1652 } 1653 1654 static int 1655 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1656 { 1657 struct ifbrparam *param = arg; 1658 1659 sc->sc_brtmax = param->ifbrp_csize; 1660 bridge_rttrim(sc); 1661 1662 return (0); 1663 } 1664 1665 static int 1666 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1667 { 1668 struct ifbrparam *param = arg; 1669 1670 param->ifbrp_csize = sc->sc_brtmax; 1671 1672 return (0); 1673 } 1674 1675 static int 1676 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1677 { 1678 struct ifbifconf *bifc = arg; 1679 struct bridge_iflist *bif; 1680 struct ifbreq breq; 1681 char *buf, *outbuf; 1682 int count, buflen, len, error = 0; 1683 1684 count = 0; 1685 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1686 count++; 1687 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1688 count++; 1689 1690 buflen = sizeof(breq) * count; 1691 if (bifc->ifbic_len == 0) { 1692 bifc->ifbic_len = buflen; 1693 return (0); 1694 } 1695 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1696 if (outbuf == NULL) 1697 return (ENOMEM); 1698 1699 count = 0; 1700 buf = outbuf; 1701 len = min(bifc->ifbic_len, buflen); 1702 bzero(&breq, sizeof(breq)); 1703 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1704 if (len < sizeof(breq)) 1705 break; 1706 1707 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1708 sizeof(breq.ifbr_ifsname)); 1709 /* Fill in the ifbreq structure */ 1710 error = bridge_ioctl_gifflags(sc, &breq); 1711 if (error) 1712 break; 1713 memcpy(buf, &breq, sizeof(breq)); 1714 count++; 1715 buf += sizeof(breq); 1716 len -= sizeof(breq); 1717 } 1718 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1719 if (len < sizeof(breq)) 1720 break; 1721 1722 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1723 sizeof(breq.ifbr_ifsname)); 1724 breq.ifbr_ifsflags = bif->bif_flags; 1725 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1726 memcpy(buf, &breq, sizeof(breq)); 1727 count++; 1728 buf += sizeof(breq); 1729 len -= sizeof(breq); 1730 } 1731 1732 bifc->ifbic_len = sizeof(breq) * count; 1733 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1734 free(outbuf, M_TEMP); 1735 return (error); 1736 } 1737 1738 static int 1739 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1740 { 1741 struct ifbaconf *bac = arg; 1742 struct bridge_rtnode *brt; 1743 struct ifbareq bareq; 1744 char *buf, *outbuf; 1745 int count, buflen, len, error = 0; 1746 1747 if (bac->ifbac_len == 0) 1748 return (0); 1749 1750 count = 0; 1751 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1752 count++; 1753 buflen = sizeof(bareq) * count; 1754 1755 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1756 if (outbuf == NULL) 1757 return (ENOMEM); 1758 1759 count = 0; 1760 buf = outbuf; 1761 len = min(bac->ifbac_len, buflen); 1762 bzero(&bareq, sizeof(bareq)); 1763 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1764 if (len < sizeof(bareq)) 1765 goto out; 1766 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1767 sizeof(bareq.ifba_ifsname)); 1768 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1769 bareq.ifba_vlan = brt->brt_vlan; 1770 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1771 time_uptime < brt->brt_expire) 1772 bareq.ifba_expire = brt->brt_expire - time_uptime; 1773 else 1774 bareq.ifba_expire = 0; 1775 bareq.ifba_flags = brt->brt_flags; 1776 1777 memcpy(buf, &bareq, sizeof(bareq)); 1778 count++; 1779 buf += sizeof(bareq); 1780 len -= sizeof(bareq); 1781 } 1782 out: 1783 bac->ifbac_len = sizeof(bareq) * count; 1784 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1785 free(outbuf, M_TEMP); 1786 return (error); 1787 } 1788 1789 static int 1790 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1791 { 1792 struct ifbareq *req = arg; 1793 struct bridge_iflist *bif; 1794 struct epoch_tracker et; 1795 int error; 1796 1797 NET_EPOCH_ENTER(et); 1798 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1799 if (bif == NULL) { 1800 NET_EPOCH_EXIT(et); 1801 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1802 } 1803 1804 /* bridge_rtupdate() may acquire the lock. */ 1805 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1806 req->ifba_flags); 1807 NET_EPOCH_EXIT(et); 1808 1809 return (error); 1810 } 1811 1812 static int 1813 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1814 { 1815 struct ifbrparam *param = arg; 1816 1817 sc->sc_brttimeout = param->ifbrp_ctime; 1818 return (0); 1819 } 1820 1821 static int 1822 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1823 { 1824 struct ifbrparam *param = arg; 1825 1826 param->ifbrp_ctime = sc->sc_brttimeout; 1827 return (0); 1828 } 1829 1830 static int 1831 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1832 { 1833 struct ifbareq *req = arg; 1834 int vlan = req->ifba_vlan; 1835 1836 /* Userspace uses '0' to mean 'any vlan' */ 1837 if (vlan == 0) 1838 vlan = DOT1Q_VID_RSVD_IMPL; 1839 1840 return (bridge_rtdaddr(sc, req->ifba_dst, vlan)); 1841 } 1842 1843 static int 1844 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1845 { 1846 struct ifbreq *req = arg; 1847 1848 BRIDGE_RT_LOCK(sc); 1849 bridge_rtflush(sc, req->ifbr_ifsflags); 1850 BRIDGE_RT_UNLOCK(sc); 1851 1852 return (0); 1853 } 1854 1855 static int 1856 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1857 { 1858 struct ifbrparam *param = arg; 1859 struct bstp_state *bs = &sc->sc_stp; 1860 1861 param->ifbrp_prio = bs->bs_bridge_priority; 1862 return (0); 1863 } 1864 1865 static int 1866 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1867 { 1868 struct ifbrparam *param = arg; 1869 1870 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1871 } 1872 1873 static int 1874 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1875 { 1876 struct ifbrparam *param = arg; 1877 struct bstp_state *bs = &sc->sc_stp; 1878 1879 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1880 return (0); 1881 } 1882 1883 static int 1884 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1885 { 1886 struct ifbrparam *param = arg; 1887 1888 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1889 } 1890 1891 static int 1892 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1893 { 1894 struct ifbrparam *param = arg; 1895 struct bstp_state *bs = &sc->sc_stp; 1896 1897 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1898 return (0); 1899 } 1900 1901 static int 1902 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1903 { 1904 struct ifbrparam *param = arg; 1905 1906 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1907 } 1908 1909 static int 1910 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1911 { 1912 struct ifbrparam *param = arg; 1913 struct bstp_state *bs = &sc->sc_stp; 1914 1915 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1916 return (0); 1917 } 1918 1919 static int 1920 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1921 { 1922 struct ifbrparam *param = arg; 1923 1924 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1925 } 1926 1927 static int 1928 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1929 { 1930 struct ifbreq *req = arg; 1931 struct bridge_iflist *bif; 1932 1933 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1934 if (bif == NULL) 1935 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1936 1937 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1938 } 1939 1940 static int 1941 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1942 { 1943 struct ifbreq *req = arg; 1944 struct bridge_iflist *bif; 1945 1946 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1947 if (bif == NULL) 1948 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1949 1950 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1951 } 1952 1953 static int 1954 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1955 { 1956 struct ifbreq *req = arg; 1957 struct bridge_iflist *bif; 1958 1959 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1960 if (bif == NULL) 1961 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1962 1963 bif->bif_addrmax = req->ifbr_addrmax; 1964 return (0); 1965 } 1966 1967 static int 1968 bridge_ioctl_sifpvid(struct bridge_softc *sc, void *arg) 1969 { 1970 struct ifbreq *req = arg; 1971 struct bridge_iflist *bif; 1972 1973 if ((sc->sc_flags & IFBRF_VLANFILTER) == 0) 1974 return (EXTERROR(EINVAL, "VLAN filtering not enabled")); 1975 1976 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1977 if (bif == NULL) 1978 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1979 1980 if (req->ifbr_pvid > DOT1Q_VID_MAX) 1981 return (EXTERROR(EINVAL, "Invalid VLAN ID")); 1982 1983 bif->bif_pvid = req->ifbr_pvid; 1984 return (0); 1985 } 1986 1987 static int 1988 bridge_ioctl_sifvlanset(struct bridge_softc *sc, void *arg) 1989 { 1990 struct ifbif_vlan_req *req = arg; 1991 struct bridge_iflist *bif; 1992 1993 if ((sc->sc_flags & IFBRF_VLANFILTER) == 0) 1994 return (EXTERROR(EINVAL, "VLAN filtering not enabled")); 1995 1996 bif = bridge_lookup_member(sc, req->bv_ifname); 1997 if (bif == NULL) 1998 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1999 2000 /* Reject invalid VIDs. */ 2001 if (BRVLAN_TEST(&req->bv_set, DOT1Q_VID_NULL) || 2002 BRVLAN_TEST(&req->bv_set, DOT1Q_VID_RSVD_IMPL)) 2003 return (EXTERROR(EINVAL, "Invalid VLAN ID in set")); 2004 2005 switch (req->bv_op) { 2006 /* Replace the existing vlan set with the new set */ 2007 case BRDG_VLAN_OP_SET: 2008 BIT_COPY(BRVLAN_SETSIZE, &req->bv_set, &bif->bif_vlan_set); 2009 break; 2010 2011 /* Modify the existing vlan set to add the given vlans */ 2012 case BRDG_VLAN_OP_ADD: 2013 BIT_OR(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2014 break; 2015 2016 /* Modify the existing vlan set to remove the given vlans */ 2017 case BRDG_VLAN_OP_DEL: 2018 BIT_ANDNOT(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2019 break; 2020 2021 /* Invalid or unknown operation */ 2022 default: 2023 return (EXTERROR(EINVAL, 2024 "Unsupported BRDGSIFVLANSET operation")); 2025 } 2026 2027 return (0); 2028 } 2029 2030 static int 2031 bridge_ioctl_gifvlanset(struct bridge_softc *sc, void *arg) 2032 { 2033 struct ifbif_vlan_req *req = arg; 2034 struct bridge_iflist *bif; 2035 2036 bif = bridge_lookup_member(sc, req->bv_ifname); 2037 if (bif == NULL) 2038 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2039 2040 BIT_COPY(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2041 return (0); 2042 } 2043 2044 static int 2045 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 2046 { 2047 struct ifbreq *req = arg; 2048 struct bridge_iflist *bif = NULL; 2049 struct ifnet *ifs; 2050 2051 ifs = ifunit(req->ifbr_ifsname); 2052 if (ifs == NULL) 2053 return (EXTERROR(ENOENT, "No such interface")); 2054 2055 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2056 if (ifs == bif->bif_ifp) 2057 return (EXTERROR(EBUSY, 2058 "Interface is already a span port")); 2059 2060 if (ifs->if_bridge != NULL) 2061 return (EXTERROR(EEXIST, 2062 "Interface is already a bridge member")); 2063 2064 switch (ifs->if_type) { 2065 case IFT_ETHER: 2066 case IFT_GIF: 2067 case IFT_L2VLAN: 2068 break; 2069 default: 2070 return (EXTERROR(EINVAL, "Unsupported interface type")); 2071 } 2072 2073 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 2074 if (bif == NULL) 2075 return (ENOMEM); 2076 2077 bif->bif_ifp = ifs; 2078 bif->bif_flags = IFBIF_SPAN; 2079 2080 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 2081 2082 return (0); 2083 } 2084 2085 static int 2086 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 2087 { 2088 struct ifbreq *req = arg; 2089 struct bridge_iflist *bif; 2090 struct ifnet *ifs; 2091 2092 ifs = ifunit(req->ifbr_ifsname); 2093 if (ifs == NULL) 2094 return (EXTERROR(ENOENT, "No such interface")); 2095 2096 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2097 if (ifs == bif->bif_ifp) 2098 break; 2099 2100 if (bif == NULL) 2101 return (EXTERROR(ENOENT, "Interface is not a span port")); 2102 2103 bridge_delete_span(sc, bif); 2104 2105 return (0); 2106 } 2107 2108 static int 2109 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 2110 { 2111 struct ifbropreq *req = arg; 2112 struct bstp_state *bs = &sc->sc_stp; 2113 struct bstp_port *root_port; 2114 2115 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 2116 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 2117 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 2118 2119 root_port = bs->bs_root_port; 2120 if (root_port == NULL) 2121 req->ifbop_root_port = 0; 2122 else 2123 req->ifbop_root_port = root_port->bp_ifp->if_index; 2124 2125 req->ifbop_holdcount = bs->bs_txholdcount; 2126 req->ifbop_priority = bs->bs_bridge_priority; 2127 req->ifbop_protocol = bs->bs_protover; 2128 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 2129 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 2130 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 2131 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 2132 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 2133 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 2134 2135 return (0); 2136 } 2137 2138 static int 2139 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 2140 { 2141 struct ifbrparam *param = arg; 2142 2143 param->ifbrp_cexceeded = sc->sc_brtexceeded; 2144 return (0); 2145 } 2146 2147 static int 2148 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 2149 { 2150 struct ifbpstpconf *bifstp = arg; 2151 struct bridge_iflist *bif; 2152 struct bstp_port *bp; 2153 struct ifbpstpreq bpreq; 2154 char *buf, *outbuf; 2155 int count, buflen, len, error = 0; 2156 2157 count = 0; 2158 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2159 if ((bif->bif_flags & IFBIF_STP) != 0) 2160 count++; 2161 } 2162 2163 buflen = sizeof(bpreq) * count; 2164 if (bifstp->ifbpstp_len == 0) { 2165 bifstp->ifbpstp_len = buflen; 2166 return (0); 2167 } 2168 2169 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 2170 if (outbuf == NULL) 2171 return (ENOMEM); 2172 2173 count = 0; 2174 buf = outbuf; 2175 len = min(bifstp->ifbpstp_len, buflen); 2176 bzero(&bpreq, sizeof(bpreq)); 2177 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2178 if (len < sizeof(bpreq)) 2179 break; 2180 2181 if ((bif->bif_flags & IFBIF_STP) == 0) 2182 continue; 2183 2184 bp = &bif->bif_stp; 2185 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 2186 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 2187 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 2188 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 2189 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 2190 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 2191 2192 memcpy(buf, &bpreq, sizeof(bpreq)); 2193 count++; 2194 buf += sizeof(bpreq); 2195 len -= sizeof(bpreq); 2196 } 2197 2198 bifstp->ifbpstp_len = sizeof(bpreq) * count; 2199 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 2200 free(outbuf, M_TEMP); 2201 return (error); 2202 } 2203 2204 static int 2205 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 2206 { 2207 struct ifbrparam *param = arg; 2208 2209 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 2210 } 2211 2212 static int 2213 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 2214 { 2215 struct ifbrparam *param = arg; 2216 2217 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 2218 } 2219 2220 static int 2221 bridge_ioctl_gflags(struct bridge_softc *sc, void *arg) 2222 { 2223 struct ifbrparam *param = arg; 2224 2225 param->ifbrp_flags = sc->sc_flags; 2226 2227 return (0); 2228 } 2229 2230 static int 2231 bridge_ioctl_sflags(struct bridge_softc *sc, void *arg) 2232 { 2233 struct ifbrparam *param = arg; 2234 2235 sc->sc_flags = param->ifbrp_flags; 2236 2237 return (0); 2238 } 2239 2240 static int 2241 bridge_ioctl_gdefpvid(struct bridge_softc *sc, void *arg) 2242 { 2243 struct ifbrparam *param = arg; 2244 2245 param->ifbrp_defpvid = sc->sc_defpvid; 2246 2247 return (0); 2248 } 2249 2250 static int 2251 bridge_ioctl_sdefpvid(struct bridge_softc *sc, void *arg) 2252 { 2253 struct ifbrparam *param = arg; 2254 2255 /* Reject invalid VIDs, but allow 0 to mean 'none'. */ 2256 if (param->ifbrp_defpvid > DOT1Q_VID_MAX) 2257 return (EINVAL); 2258 2259 sc->sc_defpvid = param->ifbrp_defpvid; 2260 2261 return (0); 2262 } 2263 2264 static int 2265 bridge_ioctl_svlanproto(struct bridge_softc *sc, void *arg) 2266 { 2267 struct ifbreq *req = arg; 2268 struct bridge_iflist *bif; 2269 2270 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 2271 if (bif == NULL) 2272 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2273 2274 if (req->ifbr_vlanproto != ETHERTYPE_VLAN && 2275 req->ifbr_vlanproto != ETHERTYPE_QINQ) 2276 return (EXTERROR(EINVAL, "Invalid VLAN protocol")); 2277 2278 bif->bif_vlanproto = req->ifbr_vlanproto; 2279 2280 return (0); 2281 } 2282 /* 2283 * bridge_ifdetach: 2284 * 2285 * Detach an interface from a bridge. Called when a member 2286 * interface is detaching. 2287 */ 2288 static void 2289 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 2290 { 2291 struct bridge_iflist *bif = ifp->if_bridge; 2292 struct bridge_softc *sc = NULL; 2293 2294 if (bif) 2295 sc = bif->bif_sc; 2296 2297 if (ifp->if_flags & IFF_RENAMING) 2298 return; 2299 if (V_bridge_cloner == NULL) { 2300 /* 2301 * This detach handler can be called after 2302 * vnet_bridge_uninit(). Just return in that case. 2303 */ 2304 return; 2305 } 2306 /* Check if the interface is a bridge member */ 2307 if (sc != NULL) { 2308 BRIDGE_LOCK(sc); 2309 bridge_delete_member(sc, bif, 1); 2310 BRIDGE_UNLOCK(sc); 2311 return; 2312 } 2313 2314 /* Check if the interface is a span port */ 2315 BRIDGE_LIST_LOCK(); 2316 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 2317 BRIDGE_LOCK(sc); 2318 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2319 if (ifp == bif->bif_ifp) { 2320 bridge_delete_span(sc, bif); 2321 break; 2322 } 2323 2324 BRIDGE_UNLOCK(sc); 2325 } 2326 BRIDGE_LIST_UNLOCK(); 2327 } 2328 2329 /* 2330 * bridge_init: 2331 * 2332 * Initialize a bridge interface. 2333 */ 2334 static void 2335 bridge_init(void *xsc) 2336 { 2337 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2338 struct ifnet *ifp = sc->sc_ifp; 2339 2340 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2341 return; 2342 2343 BRIDGE_LOCK(sc); 2344 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2345 bridge_timer, sc); 2346 2347 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2348 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2349 2350 BRIDGE_UNLOCK(sc); 2351 } 2352 2353 /* 2354 * bridge_stop: 2355 * 2356 * Stop the bridge interface. 2357 */ 2358 static void 2359 bridge_stop(struct ifnet *ifp, int disable) 2360 { 2361 struct bridge_softc *sc = ifp->if_softc; 2362 2363 BRIDGE_LOCK_ASSERT(sc); 2364 2365 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2366 return; 2367 2368 BRIDGE_RT_LOCK(sc); 2369 callout_stop(&sc->sc_brcallout); 2370 2371 bstp_stop(&sc->sc_stp); 2372 2373 bridge_rtflush(sc, IFBF_FLUSHDYN); 2374 BRIDGE_RT_UNLOCK(sc); 2375 2376 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2377 } 2378 2379 /* 2380 * bridge_enqueue: 2381 * 2382 * Enqueue a packet on a bridge member interface. 2383 * 2384 */ 2385 static int 2386 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 2387 struct bridge_iflist *bif) 2388 { 2389 int len, err = 0; 2390 short mflags; 2391 struct mbuf *m0; 2392 2393 /* 2394 * Find the bridge member port this packet is being sent on, if the 2395 * caller didn't already provide it. 2396 */ 2397 if (bif == NULL) 2398 bif = bridge_lookup_member_if(sc, dst_ifp); 2399 if (bif == NULL) { 2400 /* Perhaps the interface was removed from the bridge */ 2401 m_freem(m); 2402 return (EINVAL); 2403 } 2404 2405 /* We may be sending a fragment so traverse the mbuf */ 2406 for (; m; m = m0) { 2407 m0 = m->m_nextpkt; 2408 m->m_nextpkt = NULL; 2409 len = m->m_pkthdr.len; 2410 mflags = m->m_flags; 2411 2412 /* 2413 * If VLAN filtering is enabled, and the native VLAN ID of the 2414 * outgoing interface matches the VLAN ID of the frame, remove 2415 * the VLAN header. 2416 */ 2417 if ((sc->sc_flags & IFBRF_VLANFILTER) && 2418 bif->bif_pvid != DOT1Q_VID_NULL && 2419 VLANTAGOF(m) == bif->bif_pvid) { 2420 m->m_flags &= ~M_VLANTAG; 2421 m->m_pkthdr.ether_vtag = 0; 2422 } 2423 2424 /* 2425 * There are two cases where we have to insert our own tag: 2426 * if the member interface doesn't support hardware tagging, 2427 * or if the tag proto is not 802.1q. 2428 */ 2429 if ((m->m_flags & M_VLANTAG) && 2430 ((dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0 || 2431 bif->bif_vlanproto != ETHERTYPE_VLAN)) { 2432 m = ether_vlanencap_proto(m, m->m_pkthdr.ether_vtag, 2433 bif->bif_vlanproto); 2434 if (m == NULL) { 2435 if_printf(dst_ifp, 2436 "unable to prepend VLAN header\n"); 2437 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2438 continue; 2439 } 2440 m->m_flags &= ~M_VLANTAG; 2441 } 2442 2443 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2444 /* 2445 * XXXZL: gif(4) requires the af to be saved in csum_data field 2446 * so that gif_transmit() routine can pull it back. 2447 */ 2448 if (dst_ifp->if_type == IFT_GIF) 2449 m->m_pkthdr.csum_data = AF_LINK; 2450 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2451 int n; 2452 2453 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2454 m0 = m->m_nextpkt; 2455 m_freem(m); 2456 } 2457 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2458 break; 2459 } 2460 2461 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2462 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2463 if (mflags & M_MCAST) 2464 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2465 } 2466 2467 return (err); 2468 } 2469 2470 /* 2471 * bridge_dummynet: 2472 * 2473 * Receive a queued packet from dummynet and pass it on to the output 2474 * interface. 2475 * 2476 * The mbuf has the Ethernet header already attached. 2477 */ 2478 static void 2479 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2480 { 2481 struct bridge_iflist *bif = ifp->if_bridge; 2482 struct bridge_softc *sc = NULL; 2483 2484 if (bif) 2485 sc = bif->bif_sc; 2486 2487 /* 2488 * The packet didnt originate from a member interface. This should only 2489 * ever happen if a member interface is removed while packets are 2490 * queued for it. 2491 */ 2492 if (sc == NULL) { 2493 m_freem(m); 2494 return; 2495 } 2496 2497 if (PFIL_HOOKED_OUT_46) { 2498 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2499 return; 2500 if (m == NULL) 2501 return; 2502 } 2503 2504 bridge_enqueue(sc, ifp, m, NULL); 2505 } 2506 2507 /* 2508 * bridge_output: 2509 * 2510 * Send output from a bridge member interface. This 2511 * performs the bridging function for locally originated 2512 * packets. 2513 * 2514 * The mbuf has the Ethernet header already attached. We must 2515 * enqueue or free the mbuf before returning. 2516 */ 2517 static int 2518 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2519 struct rtentry *rt) 2520 { 2521 struct ether_header *eh; 2522 struct bridge_iflist *sbif; 2523 struct ifnet *bifp, *dst_if; 2524 struct bridge_softc *sc; 2525 ether_vlanid_t vlan; 2526 2527 NET_EPOCH_ASSERT(); 2528 2529 if (m->m_len < ETHER_HDR_LEN) { 2530 m = m_pullup(m, ETHER_HDR_LEN); 2531 if (m == NULL) 2532 return (0); 2533 } 2534 2535 sbif = ifp->if_bridge; 2536 sc = sbif->bif_sc; 2537 bifp = sc->sc_ifp; 2538 2539 eh = mtod(m, struct ether_header *); 2540 vlan = VLANTAGOF(m); 2541 2542 /* 2543 * If bridge is down, but the original output interface is up, 2544 * go ahead and send out that interface. Otherwise, the packet 2545 * is dropped below. 2546 */ 2547 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2548 dst_if = ifp; 2549 goto sendunicast; 2550 } 2551 2552 /* 2553 * If the packet is a multicast, or we don't know a better way to 2554 * get there, send to all interfaces. 2555 */ 2556 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2557 dst_if = NULL; 2558 else 2559 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2560 /* Tap any traffic not passing back out the originating interface */ 2561 if (dst_if != ifp) 2562 ETHER_BPF_MTAP(bifp, m); 2563 if (dst_if == NULL) { 2564 struct bridge_iflist *bif; 2565 struct mbuf *mc; 2566 int used = 0; 2567 2568 bridge_span(sc, m); 2569 2570 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2571 dst_if = bif->bif_ifp; 2572 2573 if (dst_if->if_type == IFT_GIF) 2574 continue; 2575 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2576 continue; 2577 2578 /* 2579 * If this is not the original output interface, 2580 * and the interface is participating in spanning 2581 * tree, make sure the port is in a state that 2582 * allows forwarding. 2583 */ 2584 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2585 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2586 continue; 2587 2588 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2589 used = 1; 2590 mc = m; 2591 } else { 2592 mc = m_dup(m, M_NOWAIT); 2593 if (mc == NULL) { 2594 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2595 continue; 2596 } 2597 } 2598 2599 bridge_enqueue(sc, dst_if, mc, bif); 2600 } 2601 if (used == 0) 2602 m_freem(m); 2603 return (0); 2604 } 2605 2606 sendunicast: 2607 /* 2608 * XXX Spanning tree consideration here? 2609 */ 2610 2611 bridge_span(sc, m); 2612 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2613 m_freem(m); 2614 return (0); 2615 } 2616 2617 bridge_enqueue(sc, dst_if, m, NULL); 2618 return (0); 2619 } 2620 2621 /* 2622 * bridge_transmit: 2623 * 2624 * Do output on a bridge. 2625 * 2626 */ 2627 static int 2628 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2629 { 2630 struct bridge_softc *sc; 2631 struct ether_header *eh; 2632 struct ifnet *dst_if; 2633 int error = 0; 2634 ether_vlanid_t vlan; 2635 2636 sc = ifp->if_softc; 2637 2638 ETHER_BPF_MTAP(ifp, m); 2639 2640 eh = mtod(m, struct ether_header *); 2641 vlan = VLANTAGOF(m); 2642 2643 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2644 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan)) != NULL) { 2645 error = bridge_enqueue(sc, dst_if, m, NULL); 2646 } else 2647 bridge_broadcast(sc, ifp, m, 0); 2648 2649 return (error); 2650 } 2651 2652 #ifdef ALTQ 2653 static void 2654 bridge_altq_start(if_t ifp) 2655 { 2656 struct ifaltq *ifq = &ifp->if_snd; 2657 struct mbuf *m; 2658 2659 IFQ_LOCK(ifq); 2660 IFQ_DEQUEUE_NOLOCK(ifq, m); 2661 while (m != NULL) { 2662 bridge_transmit(ifp, m); 2663 IFQ_DEQUEUE_NOLOCK(ifq, m); 2664 } 2665 IFQ_UNLOCK(ifq); 2666 } 2667 2668 static int 2669 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2670 { 2671 int err; 2672 2673 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2674 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2675 if (err == 0) 2676 bridge_altq_start(ifp); 2677 } else 2678 err = bridge_transmit(ifp, m); 2679 2680 return (err); 2681 } 2682 #endif /* ALTQ */ 2683 2684 /* 2685 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2686 */ 2687 static void 2688 bridge_qflush(struct ifnet *ifp __unused) 2689 { 2690 } 2691 2692 /* 2693 * bridge_forward: 2694 * 2695 * The forwarding function of the bridge. 2696 * 2697 * NOTE: Releases the lock on return. 2698 */ 2699 static void 2700 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2701 struct mbuf *m) 2702 { 2703 struct bridge_iflist *dbif; 2704 struct ifnet *src_if, *dst_if, *ifp; 2705 struct ether_header *eh; 2706 uint8_t *dst; 2707 int error; 2708 ether_vlanid_t vlan; 2709 2710 NET_EPOCH_ASSERT(); 2711 2712 src_if = m->m_pkthdr.rcvif; 2713 ifp = sc->sc_ifp; 2714 vlan = VLANTAGOF(m); 2715 2716 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2717 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2718 2719 if ((sbif->bif_flags & IFBIF_STP) && 2720 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2721 goto drop; 2722 2723 eh = mtod(m, struct ether_header *); 2724 dst = eh->ether_dhost; 2725 2726 /* If the interface is learning, record the address. */ 2727 if (sbif->bif_flags & IFBIF_LEARNING) { 2728 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2729 sbif, 0, IFBAF_DYNAMIC); 2730 /* 2731 * If the interface has addresses limits then deny any source 2732 * that is not in the cache. 2733 */ 2734 if (error && sbif->bif_addrmax) 2735 goto drop; 2736 } 2737 2738 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2739 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2740 goto drop; 2741 2742 #ifdef DEV_NETMAP 2743 /* 2744 * Hand the packet to netmap only if it wasn't injected by netmap 2745 * itself. 2746 */ 2747 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2748 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2749 ifp->if_input(ifp, m); 2750 return; 2751 } 2752 m->m_flags &= ~M_BRIDGE_INJECT; 2753 #endif 2754 2755 /* 2756 * At this point, the port either doesn't participate 2757 * in spanning tree or it is in the forwarding state. 2758 */ 2759 2760 /* 2761 * If the packet is unicast, destined for someone on 2762 * "this" side of the bridge, drop it. 2763 */ 2764 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2765 dst_if = bridge_rtlookup(sc, dst, vlan); 2766 if (src_if == dst_if) 2767 goto drop; 2768 } else { 2769 /* 2770 * Check if its a reserved multicast address, any address 2771 * listed in 802.1D section 7.12.6 may not be forwarded by the 2772 * bridge. 2773 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2774 */ 2775 if (dst[0] == 0x01 && dst[1] == 0x80 && 2776 dst[2] == 0xc2 && dst[3] == 0x00 && 2777 dst[4] == 0x00 && dst[5] <= 0x0f) 2778 goto drop; 2779 2780 /* ...forward it to all interfaces. */ 2781 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2782 dst_if = NULL; 2783 } 2784 2785 /* 2786 * If we have a destination interface which is a member of our bridge, 2787 * OR this is a unicast packet, push it through the bpf(4) machinery. 2788 * For broadcast or multicast packets, don't bother because it will 2789 * be reinjected into ether_input. We do this before we pass the packets 2790 * through the pfil(9) framework, as it is possible that pfil(9) will 2791 * drop the packet, or possibly modify it, making it difficult to debug 2792 * firewall issues on the bridge. 2793 */ 2794 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2795 ETHER_BPF_MTAP(ifp, m); 2796 2797 /* run the packet filter */ 2798 if (PFIL_HOOKED_IN_46) { 2799 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2800 return; 2801 if (m == NULL) 2802 return; 2803 } 2804 2805 if (dst_if == NULL) { 2806 bridge_broadcast(sc, src_if, m, 1); 2807 return; 2808 } 2809 2810 /* 2811 * At this point, we're dealing with a unicast frame 2812 * going to a different interface. 2813 */ 2814 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2815 goto drop; 2816 2817 dbif = bridge_lookup_member_if(sc, dst_if); 2818 if (dbif == NULL) 2819 /* Not a member of the bridge (anymore?) */ 2820 goto drop; 2821 2822 /* Private segments can not talk to each other */ 2823 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2824 goto drop; 2825 2826 /* Do VLAN filtering. */ 2827 if (!bridge_vfilter_out(dbif, m)) 2828 goto drop; 2829 2830 if ((dbif->bif_flags & IFBIF_STP) && 2831 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2832 goto drop; 2833 2834 if (PFIL_HOOKED_OUT_46) { 2835 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2836 return; 2837 if (m == NULL) 2838 return; 2839 } 2840 2841 bridge_enqueue(sc, dst_if, m, dbif); 2842 return; 2843 2844 drop: 2845 m_freem(m); 2846 } 2847 2848 /* 2849 * bridge_input: 2850 * 2851 * Receive input from a member interface. Queue the packet for 2852 * bridging if it is not for us. 2853 */ 2854 static struct mbuf * 2855 bridge_input(struct ifnet *ifp, struct mbuf *m) 2856 { 2857 struct bridge_softc *sc = NULL; 2858 struct bridge_iflist *bif, *bif2; 2859 struct ifnet *bifp; 2860 struct ether_header *eh; 2861 struct mbuf *mc, *mc2; 2862 ether_vlanid_t vlan; 2863 int error; 2864 2865 NET_EPOCH_ASSERT(); 2866 2867 /* We need the Ethernet header later, so make sure we have it now. */ 2868 if (m->m_len < ETHER_HDR_LEN) { 2869 m = m_pullup(m, ETHER_HDR_LEN); 2870 if (m == NULL) { 2871 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2872 m_freem(m); 2873 return (NULL); 2874 } 2875 } 2876 2877 eh = mtod(m, struct ether_header *); 2878 vlan = VLANTAGOF(m); 2879 2880 /* 2881 * If this frame has a VLAN tag and the receiving interface has a 2882 * vlan(4) trunk, then it is is destined for vlan(4), not for us. 2883 * This means if vlan(4) and bridge(4) are configured on the same 2884 * interface, vlan(4) is preferred, which is what users typically 2885 * expect. 2886 */ 2887 if (vlan != DOT1Q_VID_NULL && ifp->if_vlantrunk != NULL) 2888 return (m); 2889 2890 bif = ifp->if_bridge; 2891 if (bif) 2892 sc = bif->bif_sc; 2893 2894 if (sc == NULL) { 2895 /* 2896 * This packet originated from the bridge itself, so it must 2897 * have been transmitted by netmap. Derive the "source" 2898 * interface from the source address and drop the packet if the 2899 * source address isn't known. 2900 */ 2901 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2902 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2903 sc = if_getsoftc(ifp); 2904 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2905 if (ifp == NULL) { 2906 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2907 m_freem(m); 2908 return (NULL); 2909 } 2910 m->m_pkthdr.rcvif = ifp; 2911 } 2912 bifp = sc->sc_ifp; 2913 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2914 return (m); 2915 2916 /* 2917 * Implement support for bridge monitoring. If this flag has been 2918 * set on this interface, discard the packet once we push it through 2919 * the bpf(4) machinery, but before we do, increment the byte and 2920 * packet counters associated with this interface. 2921 */ 2922 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2923 m->m_pkthdr.rcvif = bifp; 2924 ETHER_BPF_MTAP(bifp, m); 2925 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2926 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2927 m_freem(m); 2928 return (NULL); 2929 } 2930 2931 /* Do VLAN filtering. */ 2932 if (!bridge_vfilter_in(bif, m)) { 2933 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2934 m_freem(m); 2935 return (NULL); 2936 } 2937 /* bridge_vfilter_in() may add a tag */ 2938 vlan = VLANTAGOF(m); 2939 2940 bridge_span(sc, m); 2941 2942 if (m->m_flags & (M_BCAST|M_MCAST)) { 2943 /* Tap off 802.1D packets; they do not get forwarded. */ 2944 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2945 ETHER_ADDR_LEN) == 0) { 2946 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2947 return (NULL); 2948 } 2949 2950 if ((bif->bif_flags & IFBIF_STP) && 2951 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2952 return (m); 2953 } 2954 2955 /* 2956 * Make a deep copy of the packet and enqueue the copy 2957 * for bridge processing; return the original packet for 2958 * local processing. 2959 */ 2960 mc = m_dup(m, M_NOWAIT); 2961 if (mc == NULL) { 2962 return (m); 2963 } 2964 2965 /* Perform the bridge forwarding function with the copy. */ 2966 bridge_forward(sc, bif, mc); 2967 2968 #ifdef DEV_NETMAP 2969 /* 2970 * If netmap is enabled and has not already seen this packet, 2971 * then it will be consumed by bridge_forward(). 2972 */ 2973 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2974 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2975 m_freem(m); 2976 return (NULL); 2977 } 2978 #endif 2979 2980 /* 2981 * Reinject the mbuf as arriving on the bridge so we have a 2982 * chance at claiming multicast packets. We can not loop back 2983 * here from ether_input as a bridge is never a member of a 2984 * bridge. 2985 */ 2986 KASSERT(bifp->if_bridge == NULL, 2987 ("loop created in bridge_input")); 2988 mc2 = m_dup(m, M_NOWAIT); 2989 if (mc2 != NULL) { 2990 /* Keep the layer3 header aligned */ 2991 int i = min(mc2->m_pkthdr.len, max_protohdr); 2992 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2993 } 2994 if (mc2 != NULL) { 2995 mc2->m_pkthdr.rcvif = bifp; 2996 mc2->m_flags &= ~M_BRIDGE_INJECT; 2997 sc->sc_if_input(bifp, mc2); 2998 } 2999 3000 /* Return the original packet for local processing. */ 3001 return (m); 3002 } 3003 3004 if ((bif->bif_flags & IFBIF_STP) && 3005 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 3006 return (m); 3007 } 3008 3009 #if defined(INET) || defined(INET6) 3010 #define CARP_CHECK_WE_ARE_DST(iface) \ 3011 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 3012 #define CARP_CHECK_WE_ARE_SRC(iface) \ 3013 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 3014 #else 3015 #define CARP_CHECK_WE_ARE_DST(iface) false 3016 #define CARP_CHECK_WE_ARE_SRC(iface) false 3017 #endif 3018 3019 #ifdef DEV_NETMAP 3020 #define GRAB_FOR_NETMAP(ifp, m) do { \ 3021 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 3022 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 3023 (ifp)->if_input(ifp, m); \ 3024 return (NULL); \ 3025 } \ 3026 } while (0) 3027 #else 3028 #define GRAB_FOR_NETMAP(ifp, m) 3029 #endif 3030 3031 #define GRAB_OUR_PACKETS(iface) \ 3032 if ((iface)->if_type == IFT_GIF) \ 3033 continue; \ 3034 /* It is destined for us. */ \ 3035 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 3036 CARP_CHECK_WE_ARE_DST(iface)) { \ 3037 if (bif->bif_flags & IFBIF_LEARNING) { \ 3038 error = bridge_rtupdate(sc, eh->ether_shost, \ 3039 vlan, bif, 0, IFBAF_DYNAMIC); \ 3040 if (error && bif->bif_addrmax) { \ 3041 m_freem(m); \ 3042 return (NULL); \ 3043 } \ 3044 } \ 3045 m->m_pkthdr.rcvif = iface; \ 3046 if ((iface) == ifp) { \ 3047 /* Skip bridge processing... src == dest */ \ 3048 return (m); \ 3049 } \ 3050 /* It's passing over or to the bridge, locally. */ \ 3051 ETHER_BPF_MTAP(bifp, m); \ 3052 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 3053 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 3054 /* Hand the packet over to netmap if necessary. */ \ 3055 GRAB_FOR_NETMAP(bifp, m); \ 3056 /* Filter on the physical interface. */ \ 3057 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \ 3058 if (bridge_pfil(&m, NULL, ifp, \ 3059 PFIL_IN) != 0 || m == NULL) { \ 3060 return (NULL); \ 3061 } \ 3062 } \ 3063 if ((iface) != bifp) \ 3064 ETHER_BPF_MTAP(iface, m); \ 3065 /* Pass tagged packets to if_vlan, if it's loaded */ \ 3066 if (VLANTAGOF(m) != 0) { \ 3067 if (bifp->if_vlantrunk == NULL) { \ 3068 m_freem(m); \ 3069 return (NULL); \ 3070 } \ 3071 (*vlan_input_p)(bifp, m); \ 3072 return (NULL); \ 3073 } \ 3074 return (m); \ 3075 } \ 3076 \ 3077 /* We just received a packet that we sent out. */ \ 3078 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 3079 CARP_CHECK_WE_ARE_SRC(iface)) { \ 3080 m_freem(m); \ 3081 return (NULL); \ 3082 } 3083 3084 /* 3085 * Unicast. Make sure it's not for the bridge. 3086 */ 3087 do { GRAB_OUR_PACKETS(bifp) } while (0); 3088 3089 /* 3090 * If member_ifaddrs is enabled, see if the packet is destined for 3091 * one of the members' addresses. 3092 */ 3093 if (V_member_ifaddrs) { 3094 /* Check the interface the packet arrived on. */ 3095 do { GRAB_OUR_PACKETS(ifp) } while (0); 3096 3097 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 3098 GRAB_OUR_PACKETS(bif2->bif_ifp) 3099 } 3100 } 3101 3102 #undef CARP_CHECK_WE_ARE_DST 3103 #undef CARP_CHECK_WE_ARE_SRC 3104 #undef GRAB_FOR_NETMAP 3105 #undef GRAB_OUR_PACKETS 3106 3107 /* Perform the bridge forwarding function. */ 3108 bridge_forward(sc, bif, m); 3109 3110 return (NULL); 3111 } 3112 3113 /* 3114 * Inject a packet back into the host ethernet stack. This will generally only 3115 * be used by netmap when an application writes to the host TX ring. The 3116 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 3117 * interface after ethernet processing. 3118 */ 3119 static void 3120 bridge_inject(struct ifnet *ifp, struct mbuf *m) 3121 { 3122 struct bridge_softc *sc; 3123 3124 if (ifp->if_type == IFT_L2VLAN) { 3125 /* 3126 * vlan(4) gives us the vlan ifnet, so we need to get the 3127 * bridge softc to get a pointer to ether_input to send the 3128 * packet to. 3129 */ 3130 struct ifnet *bifp = NULL; 3131 3132 if (vlan_trunkdev_p == NULL) { 3133 m_freem(m); 3134 return; 3135 } 3136 3137 bifp = vlan_trunkdev_p(ifp); 3138 if (bifp == NULL) { 3139 m_freem(m); 3140 return; 3141 } 3142 3143 sc = if_getsoftc(bifp); 3144 sc->sc_if_input(ifp, m); 3145 return; 3146 } 3147 3148 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 3149 ("%s: iface %s is not running in netmap mode", 3150 __func__, if_name(ifp))); 3151 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 3152 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 3153 3154 m->m_flags |= M_BRIDGE_INJECT; 3155 sc = if_getsoftc(ifp); 3156 sc->sc_if_input(ifp, m); 3157 } 3158 3159 /* 3160 * bridge_broadcast: 3161 * 3162 * Send a frame to all interfaces that are members of 3163 * the bridge, except for the one on which the packet 3164 * arrived. 3165 * 3166 * NOTE: Releases the lock on return. 3167 */ 3168 static void 3169 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 3170 struct mbuf *m, int runfilt) 3171 { 3172 struct bridge_iflist *dbif, *sbif; 3173 struct mbuf *mc; 3174 struct ifnet *dst_if; 3175 int used = 0, i; 3176 3177 NET_EPOCH_ASSERT(); 3178 3179 sbif = bridge_lookup_member_if(sc, src_if); 3180 3181 /* Filter on the bridge interface before broadcasting */ 3182 if (runfilt && PFIL_HOOKED_OUT_46) { 3183 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 3184 return; 3185 if (m == NULL) 3186 return; 3187 } 3188 3189 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 3190 dst_if = dbif->bif_ifp; 3191 if (dst_if == src_if) 3192 continue; 3193 3194 /* Private segments can not talk to each other */ 3195 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 3196 continue; 3197 3198 /* Do VLAN filtering. */ 3199 if (!bridge_vfilter_out(dbif, m)) 3200 continue; 3201 3202 if ((dbif->bif_flags & IFBIF_STP) && 3203 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 3204 continue; 3205 3206 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 3207 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 3208 continue; 3209 3210 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3211 continue; 3212 3213 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 3214 mc = m; 3215 used = 1; 3216 } else { 3217 mc = m_dup(m, M_NOWAIT); 3218 if (mc == NULL) { 3219 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3220 continue; 3221 } 3222 } 3223 3224 /* 3225 * Filter on the output interface. Pass a NULL bridge interface 3226 * pointer so we do not redundantly filter on the bridge for 3227 * each interface we broadcast on. 3228 */ 3229 if (runfilt && PFIL_HOOKED_OUT_46) { 3230 if (used == 0) { 3231 /* Keep the layer3 header aligned */ 3232 i = min(mc->m_pkthdr.len, max_protohdr); 3233 mc = m_copyup(mc, i, ETHER_ALIGN); 3234 if (mc == NULL) { 3235 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3236 continue; 3237 } 3238 } 3239 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 3240 continue; 3241 if (mc == NULL) 3242 continue; 3243 } 3244 3245 bridge_enqueue(sc, dst_if, mc, dbif); 3246 } 3247 if (used == 0) 3248 m_freem(m); 3249 } 3250 3251 /* 3252 * bridge_span: 3253 * 3254 * Duplicate a packet out one or more interfaces that are in span mode, 3255 * the original mbuf is unmodified. 3256 */ 3257 static void 3258 bridge_span(struct bridge_softc *sc, struct mbuf *m) 3259 { 3260 struct bridge_iflist *bif; 3261 struct ifnet *dst_if; 3262 struct mbuf *mc; 3263 3264 NET_EPOCH_ASSERT(); 3265 3266 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 3267 return; 3268 3269 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 3270 dst_if = bif->bif_ifp; 3271 3272 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3273 continue; 3274 3275 mc = m_dup(m, M_NOWAIT); 3276 if (mc == NULL) { 3277 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3278 continue; 3279 } 3280 3281 bridge_enqueue(sc, dst_if, mc, bif); 3282 } 3283 } 3284 3285 /* 3286 * Incoming VLAN filtering. Given a frame and the member interface it was 3287 * received on, decide whether the port configuration allows it. 3288 */ 3289 static bool 3290 bridge_vfilter_in(const struct bridge_iflist *sbif, struct mbuf *m) 3291 { 3292 ether_vlanid_t vlan; 3293 3294 vlan = VLANTAGOF(m); 3295 /* Make sure the vlan id is reasonable. */ 3296 if (vlan > DOT1Q_VID_MAX) 3297 return (false); 3298 3299 /* If VLAN filtering isn't enabled, pass everything. */ 3300 if ((sbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) 3301 return (true); 3302 3303 /* If Q-in-Q is disabled, check for stacked tags. */ 3304 if ((sbif->bif_flags & IFBIF_QINQ) == 0) { 3305 struct ether_header *eh; 3306 uint16_t proto; 3307 3308 eh = mtod(m, struct ether_header *); 3309 proto = ntohs(eh->ether_type); 3310 3311 if (proto == ETHERTYPE_VLAN || proto == ETHERTYPE_QINQ) 3312 return (false); 3313 } 3314 3315 if (vlan == DOT1Q_VID_NULL) { 3316 /* 3317 * The frame doesn't have a tag. If the interface does not 3318 * have an untagged vlan configured, drop the frame. 3319 */ 3320 if (sbif->bif_pvid == DOT1Q_VID_NULL) 3321 return (false); 3322 3323 /* 3324 * Otherwise, insert a new tag based on the interface's 3325 * untagged vlan id. 3326 */ 3327 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3328 m->m_flags |= M_VLANTAG; 3329 } else { 3330 /* 3331 * The frame has a tag, so check it matches the interface's 3332 * vlan access list. We explicitly do not accept tagged 3333 * frames for the untagged vlan id here (unless it's also 3334 * in the access list). 3335 */ 3336 if (!BRVLAN_TEST(&sbif->bif_vlan_set, vlan)) 3337 return (false); 3338 } 3339 3340 /* Accept the frame. */ 3341 return (true); 3342 } 3343 3344 /* 3345 * Outgoing VLAN filtering. Given a frame, its vlan, and the member interface 3346 * we intend to send it to, decide whether the port configuration allows it to 3347 * be sent. 3348 */ 3349 static bool 3350 bridge_vfilter_out(const struct bridge_iflist *dbif, const struct mbuf *m) 3351 { 3352 struct ether_header *eh; 3353 ether_vlanid_t vlan; 3354 3355 NET_EPOCH_ASSERT(); 3356 3357 /* If VLAN filtering isn't enabled, pass everything. */ 3358 if ((dbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) 3359 return (true); 3360 3361 vlan = VLANTAGOF(m); 3362 3363 /* 3364 * Always allow untagged 802.1D STP frames, even if they would 3365 * otherwise be dropped. This is required for STP to work on 3366 * a filtering bridge. 3367 * 3368 * Tagged STP (Cisco PVST+) is a non-standard extension, so 3369 * handle those frames via the normal filtering path. 3370 */ 3371 eh = mtod(m, struct ether_header *); 3372 if (vlan == DOT1Q_VID_NULL && 3373 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) 3374 return (true); 3375 3376 /* 3377 * If the frame wasn't assigned to a vlan at ingress, drop it. 3378 * We can't forward these frames to filtering ports because we 3379 * don't know what VLAN they're supposed to be in. 3380 */ 3381 if (vlan == DOT1Q_VID_NULL) 3382 return (false); 3383 3384 /* 3385 * If the frame's vlan matches the interfaces's untagged vlan, 3386 * allow it. 3387 */ 3388 if (vlan == dbif->bif_pvid) 3389 return (true); 3390 3391 /* 3392 * If the frame's vlan is on the interface's tagged access list, 3393 * allow it. 3394 */ 3395 if (BRVLAN_TEST(&dbif->bif_vlan_set, vlan)) 3396 return (true); 3397 3398 /* The frame was not permitted, so drop it. */ 3399 return (false); 3400 } 3401 3402 /* 3403 * bridge_rtupdate: 3404 * 3405 * Add a bridge routing entry. 3406 */ 3407 static int 3408 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 3409 ether_vlanid_t vlan, struct bridge_iflist *bif, 3410 int setflags, uint8_t flags) 3411 { 3412 struct bridge_rtnode *brt; 3413 struct bridge_iflist *obif; 3414 int error; 3415 3416 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3417 3418 /* Check the source address is valid and not multicast. */ 3419 if (ETHER_IS_MULTICAST(dst)) 3420 return (EXTERROR(EINVAL, "Multicast address not permitted")); 3421 if (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 3422 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) 3423 return (EXTERROR(EINVAL, "Zero address not permitted")); 3424 3425 /* 3426 * A route for this destination might already exist. If so, 3427 * update it, otherwise create a new one. 3428 */ 3429 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 3430 BRIDGE_RT_LOCK(sc); 3431 3432 /* Check again, now that we have the lock. There could have 3433 * been a race and we only want to insert this once. */ 3434 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 3435 BRIDGE_RT_UNLOCK(sc); 3436 return (0); 3437 } 3438 3439 if (sc->sc_brtcnt >= sc->sc_brtmax) { 3440 sc->sc_brtexceeded++; 3441 BRIDGE_RT_UNLOCK(sc); 3442 return (EXTERROR(ENOSPC, "Address table is full")); 3443 } 3444 /* Check per interface address limits (if enabled) */ 3445 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 3446 bif->bif_addrexceeded++; 3447 BRIDGE_RT_UNLOCK(sc); 3448 return (EXTERROR(ENOSPC, 3449 "Interface address limit exceeded")); 3450 } 3451 3452 /* 3453 * Allocate a new bridge forwarding node, and 3454 * initialize the expiration time and Ethernet 3455 * address. 3456 */ 3457 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 3458 if (brt == NULL) { 3459 BRIDGE_RT_UNLOCK(sc); 3460 return (EXTERROR(ENOMEM, 3461 "Cannot allocate address node")); 3462 } 3463 brt->brt_vnet = curvnet; 3464 3465 if (bif->bif_flags & IFBIF_STICKY) 3466 brt->brt_flags = IFBAF_STICKY; 3467 else 3468 brt->brt_flags = IFBAF_DYNAMIC; 3469 3470 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 3471 brt->brt_vlan = vlan; 3472 3473 brt->brt_dst = bif; 3474 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 3475 uma_zfree(V_bridge_rtnode_zone, brt); 3476 BRIDGE_RT_UNLOCK(sc); 3477 return (error); 3478 } 3479 bif->bif_addrcnt++; 3480 3481 BRIDGE_RT_UNLOCK(sc); 3482 } 3483 3484 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 3485 (obif = brt->brt_dst) != bif) { 3486 MPASS(obif != NULL); 3487 3488 BRIDGE_RT_LOCK(sc); 3489 brt->brt_dst->bif_addrcnt--; 3490 brt->brt_dst = bif; 3491 brt->brt_dst->bif_addrcnt++; 3492 BRIDGE_RT_UNLOCK(sc); 3493 3494 if (V_log_mac_flap && 3495 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 3496 log(LOG_NOTICE, 3497 "%s: mac address %6D vlan %d moved from %s to %s\n", 3498 sc->sc_ifp->if_xname, 3499 &brt->brt_addr[0], ":", 3500 brt->brt_vlan, 3501 obif->bif_ifp->if_xname, 3502 bif->bif_ifp->if_xname); 3503 } 3504 } 3505 3506 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3507 brt->brt_expire = time_uptime + sc->sc_brttimeout; 3508 if (setflags) 3509 brt->brt_flags = flags; 3510 3511 return (0); 3512 } 3513 3514 /* 3515 * bridge_rtlookup: 3516 * 3517 * Lookup the destination interface for an address. 3518 */ 3519 static struct ifnet * 3520 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, 3521 ether_vlanid_t vlan) 3522 { 3523 struct bridge_rtnode *brt; 3524 3525 NET_EPOCH_ASSERT(); 3526 3527 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 3528 return (NULL); 3529 3530 return (brt->brt_ifp); 3531 } 3532 3533 /* 3534 * bridge_rttrim: 3535 * 3536 * Trim the routine table so that we have a number 3537 * of routing entries less than or equal to the 3538 * maximum number. 3539 */ 3540 static void 3541 bridge_rttrim(struct bridge_softc *sc) 3542 { 3543 struct bridge_rtnode *brt, *nbrt; 3544 3545 NET_EPOCH_ASSERT(); 3546 BRIDGE_RT_LOCK_ASSERT(sc); 3547 3548 /* Make sure we actually need to do this. */ 3549 if (sc->sc_brtcnt <= sc->sc_brtmax) 3550 return; 3551 3552 /* Force an aging cycle; this might trim enough addresses. */ 3553 bridge_rtage(sc); 3554 if (sc->sc_brtcnt <= sc->sc_brtmax) 3555 return; 3556 3557 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3558 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3559 bridge_rtnode_destroy(sc, brt); 3560 if (sc->sc_brtcnt <= sc->sc_brtmax) 3561 return; 3562 } 3563 } 3564 } 3565 3566 /* 3567 * bridge_timer: 3568 * 3569 * Aging timer for the bridge. 3570 */ 3571 static void 3572 bridge_timer(void *arg) 3573 { 3574 struct bridge_softc *sc = arg; 3575 3576 BRIDGE_RT_LOCK_ASSERT(sc); 3577 3578 /* Destruction of rtnodes requires a proper vnet context */ 3579 CURVNET_SET(sc->sc_ifp->if_vnet); 3580 bridge_rtage(sc); 3581 3582 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3583 callout_reset(&sc->sc_brcallout, 3584 bridge_rtable_prune_period * hz, bridge_timer, sc); 3585 CURVNET_RESTORE(); 3586 } 3587 3588 /* 3589 * bridge_rtage: 3590 * 3591 * Perform an aging cycle. 3592 */ 3593 static void 3594 bridge_rtage(struct bridge_softc *sc) 3595 { 3596 struct bridge_rtnode *brt, *nbrt; 3597 3598 BRIDGE_RT_LOCK_ASSERT(sc); 3599 3600 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3601 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3602 if (time_uptime >= brt->brt_expire) 3603 bridge_rtnode_destroy(sc, brt); 3604 } 3605 } 3606 } 3607 3608 /* 3609 * bridge_rtflush: 3610 * 3611 * Remove all dynamic addresses from the bridge. 3612 */ 3613 static void 3614 bridge_rtflush(struct bridge_softc *sc, int full) 3615 { 3616 struct bridge_rtnode *brt, *nbrt; 3617 3618 BRIDGE_RT_LOCK_ASSERT(sc); 3619 3620 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3621 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3622 bridge_rtnode_destroy(sc, brt); 3623 } 3624 } 3625 3626 /* 3627 * bridge_rtdaddr: 3628 * 3629 * Remove an address from the table. 3630 */ 3631 static int 3632 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, 3633 ether_vlanid_t vlan) 3634 { 3635 struct bridge_rtnode *brt; 3636 int found = 0; 3637 3638 BRIDGE_RT_LOCK(sc); 3639 3640 /* 3641 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans 3642 * so the lookup may return more than one. 3643 */ 3644 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3645 bridge_rtnode_destroy(sc, brt); 3646 found = 1; 3647 } 3648 3649 BRIDGE_RT_UNLOCK(sc); 3650 3651 return (found ? 0 : ENOENT); 3652 } 3653 3654 /* 3655 * bridge_rtdelete: 3656 * 3657 * Delete routes to a speicifc member interface. 3658 */ 3659 static void 3660 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3661 { 3662 struct bridge_rtnode *brt, *nbrt; 3663 3664 BRIDGE_RT_LOCK_ASSERT(sc); 3665 3666 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3667 if (brt->brt_ifp == ifp && (full || 3668 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3669 bridge_rtnode_destroy(sc, brt); 3670 } 3671 } 3672 3673 /* 3674 * bridge_rtable_init: 3675 * 3676 * Initialize the route table for this bridge. 3677 */ 3678 static void 3679 bridge_rtable_init(struct bridge_softc *sc) 3680 { 3681 int i; 3682 3683 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3684 M_DEVBUF, M_WAITOK); 3685 3686 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3687 CK_LIST_INIT(&sc->sc_rthash[i]); 3688 3689 sc->sc_rthash_key = arc4random(); 3690 CK_LIST_INIT(&sc->sc_rtlist); 3691 } 3692 3693 /* 3694 * bridge_rtable_fini: 3695 * 3696 * Deconstruct the route table for this bridge. 3697 */ 3698 static void 3699 bridge_rtable_fini(struct bridge_softc *sc) 3700 { 3701 3702 KASSERT(sc->sc_brtcnt == 0, 3703 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3704 free(sc->sc_rthash, M_DEVBUF); 3705 } 3706 3707 /* 3708 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3709 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3710 */ 3711 #define mix(a, b, c) \ 3712 do { \ 3713 a -= b; a -= c; a ^= (c >> 13); \ 3714 b -= c; b -= a; b ^= (a << 8); \ 3715 c -= a; c -= b; c ^= (b >> 13); \ 3716 a -= b; a -= c; a ^= (c >> 12); \ 3717 b -= c; b -= a; b ^= (a << 16); \ 3718 c -= a; c -= b; c ^= (b >> 5); \ 3719 a -= b; a -= c; a ^= (c >> 3); \ 3720 b -= c; b -= a; b ^= (a << 10); \ 3721 c -= a; c -= b; c ^= (b >> 15); \ 3722 } while (/*CONSTCOND*/0) 3723 3724 static __inline uint32_t 3725 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3726 { 3727 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3728 3729 b += addr[5] << 8; 3730 b += addr[4]; 3731 a += addr[3] << 24; 3732 a += addr[2] << 16; 3733 a += addr[1] << 8; 3734 a += addr[0]; 3735 3736 mix(a, b, c); 3737 3738 return (c & BRIDGE_RTHASH_MASK); 3739 } 3740 3741 #undef mix 3742 3743 static int 3744 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3745 { 3746 int i, d; 3747 3748 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3749 d = ((int)a[i]) - ((int)b[i]); 3750 } 3751 3752 return (d); 3753 } 3754 3755 /* 3756 * bridge_rtnode_lookup: 3757 * 3758 * Look up a bridge route node for the specified destination. Compare the 3759 * vlan id or if zero then just return the first match. 3760 */ 3761 static struct bridge_rtnode * 3762 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, 3763 ether_vlanid_t vlan) 3764 { 3765 struct bridge_rtnode *brt; 3766 uint32_t hash; 3767 int dir; 3768 3769 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3770 3771 hash = bridge_rthash(sc, addr); 3772 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3773 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3774 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL)) 3775 return (brt); 3776 if (dir > 0) 3777 return (NULL); 3778 } 3779 3780 return (NULL); 3781 } 3782 3783 /* 3784 * bridge_rtnode_insert: 3785 * 3786 * Insert the specified bridge node into the route table. We 3787 * assume the entry is not already in the table. 3788 */ 3789 static int 3790 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3791 { 3792 struct bridge_rtnode *lbrt; 3793 uint32_t hash; 3794 int dir; 3795 3796 BRIDGE_RT_LOCK_ASSERT(sc); 3797 3798 hash = bridge_rthash(sc, brt->brt_addr); 3799 3800 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3801 if (lbrt == NULL) { 3802 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3803 goto out; 3804 } 3805 3806 do { 3807 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3808 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3809 return (EXTERROR(EEXIST, "Address already exists")); 3810 if (dir > 0) { 3811 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3812 goto out; 3813 } 3814 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3815 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3816 goto out; 3817 } 3818 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3819 } while (lbrt != NULL); 3820 3821 #ifdef DIAGNOSTIC 3822 panic("bridge_rtnode_insert: impossible"); 3823 #endif 3824 3825 out: 3826 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3827 sc->sc_brtcnt++; 3828 3829 return (0); 3830 } 3831 3832 static void 3833 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3834 { 3835 struct bridge_rtnode *brt; 3836 3837 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3838 3839 CURVNET_SET(brt->brt_vnet); 3840 uma_zfree(V_bridge_rtnode_zone, brt); 3841 CURVNET_RESTORE(); 3842 } 3843 3844 /* 3845 * bridge_rtnode_destroy: 3846 * 3847 * Destroy a bridge rtnode. 3848 */ 3849 static void 3850 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3851 { 3852 BRIDGE_RT_LOCK_ASSERT(sc); 3853 3854 CK_LIST_REMOVE(brt, brt_hash); 3855 3856 CK_LIST_REMOVE(brt, brt_list); 3857 sc->sc_brtcnt--; 3858 brt->brt_dst->bif_addrcnt--; 3859 3860 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3861 } 3862 3863 /* 3864 * bridge_rtable_expire: 3865 * 3866 * Set the expiry time for all routes on an interface. 3867 */ 3868 static void 3869 bridge_rtable_expire(struct ifnet *ifp, int age) 3870 { 3871 struct bridge_iflist *bif = NULL; 3872 struct bridge_softc *sc = NULL; 3873 struct bridge_rtnode *brt; 3874 3875 CURVNET_SET(ifp->if_vnet); 3876 3877 bif = ifp->if_bridge; 3878 if (bif) 3879 sc = bif->bif_sc; 3880 MPASS(sc != NULL); 3881 BRIDGE_RT_LOCK(sc); 3882 3883 /* 3884 * If the age is zero then flush, otherwise set all the expiry times to 3885 * age for the interface 3886 */ 3887 if (age == 0) 3888 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3889 else { 3890 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3891 /* Cap the expiry time to 'age' */ 3892 if (brt->brt_ifp == ifp && 3893 brt->brt_expire > time_uptime + age && 3894 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3895 brt->brt_expire = time_uptime + age; 3896 } 3897 } 3898 BRIDGE_RT_UNLOCK(sc); 3899 CURVNET_RESTORE(); 3900 } 3901 3902 /* 3903 * bridge_state_change: 3904 * 3905 * Callback from the bridgestp code when a port changes states. 3906 */ 3907 static void 3908 bridge_state_change(struct ifnet *ifp, int state) 3909 { 3910 struct bridge_iflist *bif = ifp->if_bridge; 3911 struct bridge_softc *sc = bif->bif_sc; 3912 static const char *stpstates[] = { 3913 "disabled", 3914 "listening", 3915 "learning", 3916 "forwarding", 3917 "blocking", 3918 "discarding" 3919 }; 3920 3921 CURVNET_SET(ifp->if_vnet); 3922 if (V_log_stp) 3923 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3924 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3925 CURVNET_RESTORE(); 3926 } 3927 3928 /* 3929 * Send bridge packets through pfil if they are one of the types pfil can deal 3930 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3931 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3932 * that interface. 3933 */ 3934 static int 3935 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3936 { 3937 int snap, error, i; 3938 struct ether_header *eh1, eh2; 3939 struct llc llc1; 3940 u_int16_t ether_type; 3941 pfil_return_t rv; 3942 #ifdef INET 3943 struct ip *ip = NULL; 3944 int hlen = 0; 3945 #endif 3946 3947 snap = 0; 3948 error = -1; /* Default error if not error == 0 */ 3949 3950 #if 0 3951 /* we may return with the IP fields swapped, ensure its not shared */ 3952 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3953 #endif 3954 3955 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3956 return (0); /* filtering is disabled */ 3957 3958 i = min((*mp)->m_pkthdr.len, max_protohdr); 3959 if ((*mp)->m_len < i) { 3960 *mp = m_pullup(*mp, i); 3961 if (*mp == NULL) { 3962 printf("%s: m_pullup failed\n", __func__); 3963 return (-1); 3964 } 3965 } 3966 3967 eh1 = mtod(*mp, struct ether_header *); 3968 ether_type = ntohs(eh1->ether_type); 3969 3970 /* 3971 * Check for SNAP/LLC. 3972 */ 3973 if (ether_type < ETHERMTU) { 3974 struct llc *llc2 = (struct llc *)(eh1 + 1); 3975 3976 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3977 llc2->llc_dsap == LLC_SNAP_LSAP && 3978 llc2->llc_ssap == LLC_SNAP_LSAP && 3979 llc2->llc_control == LLC_UI) { 3980 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3981 snap = 1; 3982 } 3983 } 3984 3985 /* 3986 * If we're trying to filter bridge traffic, only look at traffic for 3987 * protocols available in the kernel (IPv4 and/or IPv6) to avoid 3988 * passing traffic for an unsupported protocol to the filter. This is 3989 * lame since if we really wanted, say, an AppleTalk filter, we are 3990 * hosed, but of course we don't have an AppleTalk filter to begin 3991 * with. (Note that since pfil doesn't understand ARP it will pass 3992 * *ALL* ARP traffic.) 3993 */ 3994 switch (ether_type) { 3995 #ifdef INET 3996 case ETHERTYPE_ARP: 3997 case ETHERTYPE_REVARP: 3998 if (V_pfil_ipfw_arp == 0) 3999 return (0); /* Automatically pass */ 4000 4001 /* FALLTHROUGH */ 4002 case ETHERTYPE_IP: 4003 #endif 4004 #ifdef INET6 4005 case ETHERTYPE_IPV6: 4006 #endif /* INET6 */ 4007 break; 4008 4009 default: 4010 /* 4011 * We get here if the packet isn't from a supported 4012 * protocol. Check to see if the user wants to pass 4013 * non-IP packets, these will not be checked by pfil(9) 4014 * and passed unconditionally so the default is to 4015 * drop. 4016 */ 4017 if (V_pfil_onlyip) 4018 goto bad; 4019 } 4020 4021 /* Run the packet through pfil before stripping link headers */ 4022 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 4023 dir == PFIL_OUT && ifp != NULL) { 4024 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 4025 case PFIL_DROPPED: 4026 return (EACCES); 4027 case PFIL_CONSUMED: 4028 return (0); 4029 } 4030 } 4031 4032 /* Strip off the Ethernet header and keep a copy. */ 4033 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 4034 m_adj(*mp, ETHER_HDR_LEN); 4035 4036 /* Strip off snap header, if present */ 4037 if (snap) { 4038 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 4039 m_adj(*mp, sizeof(struct llc)); 4040 } 4041 4042 /* 4043 * Check the IP header for alignment and errors 4044 */ 4045 if (dir == PFIL_IN) { 4046 switch (ether_type) { 4047 #ifdef INET 4048 case ETHERTYPE_IP: 4049 error = bridge_ip_checkbasic(mp); 4050 break; 4051 #endif 4052 #ifdef INET6 4053 case ETHERTYPE_IPV6: 4054 error = bridge_ip6_checkbasic(mp); 4055 break; 4056 #endif /* INET6 */ 4057 default: 4058 error = 0; 4059 } 4060 if (error) 4061 goto bad; 4062 } 4063 4064 error = 0; 4065 4066 /* 4067 * Run the packet through pfil 4068 */ 4069 rv = PFIL_PASS; 4070 switch (ether_type) { 4071 #ifdef INET 4072 case ETHERTYPE_IP: 4073 /* 4074 * Run pfil on the member interface and the bridge, both can 4075 * be skipped by clearing pfil_member or pfil_bridge. 4076 * 4077 * Keep the order: 4078 * in_if -> bridge_if -> out_if 4079 */ 4080 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4081 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 4082 PFIL_PASS) 4083 break; 4084 4085 if (V_pfil_member && ifp != NULL) { 4086 rv = (dir == PFIL_OUT) ? 4087 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 4088 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 4089 if (rv != PFIL_PASS) 4090 break; 4091 } 4092 4093 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4094 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 4095 PFIL_PASS) 4096 break; 4097 4098 /* check if we need to fragment the packet */ 4099 /* bridge_fragment generates a mbuf chain of packets */ 4100 /* that already include eth headers */ 4101 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 4102 i = (*mp)->m_pkthdr.len; 4103 if (i > ifp->if_mtu) { 4104 error = bridge_fragment(ifp, mp, &eh2, snap, 4105 &llc1); 4106 return (error); 4107 } 4108 } 4109 4110 /* Recalculate the ip checksum. */ 4111 ip = mtod(*mp, struct ip *); 4112 hlen = ip->ip_hl << 2; 4113 if (hlen < sizeof(struct ip)) 4114 goto bad; 4115 if (hlen > (*mp)->m_len) { 4116 if ((*mp = m_pullup(*mp, hlen)) == NULL) 4117 goto bad; 4118 ip = mtod(*mp, struct ip *); 4119 if (ip == NULL) 4120 goto bad; 4121 } 4122 ip->ip_sum = 0; 4123 if (hlen == sizeof(struct ip)) 4124 ip->ip_sum = in_cksum_hdr(ip); 4125 else 4126 ip->ip_sum = in_cksum(*mp, hlen); 4127 4128 break; 4129 #endif /* INET */ 4130 #ifdef INET6 4131 case ETHERTYPE_IPV6: 4132 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4133 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 4134 PFIL_PASS) 4135 break; 4136 4137 if (V_pfil_member && ifp != NULL) { 4138 rv = (dir == PFIL_OUT) ? 4139 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 4140 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 4141 if (rv != PFIL_PASS) 4142 break; 4143 } 4144 4145 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4146 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 4147 PFIL_PASS) 4148 break; 4149 break; 4150 #endif 4151 } 4152 4153 switch (rv) { 4154 case PFIL_CONSUMED: 4155 return (0); 4156 case PFIL_DROPPED: 4157 return (EACCES); 4158 default: 4159 break; 4160 } 4161 4162 error = -1; 4163 4164 /* 4165 * Finally, put everything back the way it was and return 4166 */ 4167 if (snap) { 4168 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 4169 if (*mp == NULL) 4170 return (error); 4171 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 4172 } 4173 4174 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 4175 if (*mp == NULL) 4176 return (error); 4177 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 4178 4179 return (0); 4180 4181 bad: 4182 m_freem(*mp); 4183 *mp = NULL; 4184 return (error); 4185 } 4186 4187 #ifdef INET 4188 /* 4189 * Perform basic checks on header size since 4190 * pfil assumes ip_input has already processed 4191 * it for it. Cut-and-pasted from ip_input.c. 4192 * Given how simple the IPv6 version is, 4193 * does the IPv4 version really need to be 4194 * this complicated? 4195 * 4196 * XXX Should we update ipstat here, or not? 4197 * XXX Right now we update ipstat but not 4198 * XXX csum_counter. 4199 */ 4200 static int 4201 bridge_ip_checkbasic(struct mbuf **mp) 4202 { 4203 struct mbuf *m = *mp; 4204 struct ip *ip; 4205 int len, hlen; 4206 u_short sum; 4207 4208 if (*mp == NULL) 4209 return (-1); 4210 4211 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4212 if ((m = m_copyup(m, sizeof(struct ip), 4213 (max_linkhdr + 3) & ~3)) == NULL) { 4214 /* XXXJRT new stat, please */ 4215 KMOD_IPSTAT_INC(ips_toosmall); 4216 goto bad; 4217 } 4218 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 4219 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 4220 KMOD_IPSTAT_INC(ips_toosmall); 4221 goto bad; 4222 } 4223 } 4224 ip = mtod(m, struct ip *); 4225 if (ip == NULL) goto bad; 4226 4227 if (ip->ip_v != IPVERSION) { 4228 KMOD_IPSTAT_INC(ips_badvers); 4229 goto bad; 4230 } 4231 hlen = ip->ip_hl << 2; 4232 if (hlen < sizeof(struct ip)) { /* minimum header length */ 4233 KMOD_IPSTAT_INC(ips_badhlen); 4234 goto bad; 4235 } 4236 if (hlen > m->m_len) { 4237 if ((m = m_pullup(m, hlen)) == NULL) { 4238 KMOD_IPSTAT_INC(ips_badhlen); 4239 goto bad; 4240 } 4241 ip = mtod(m, struct ip *); 4242 if (ip == NULL) goto bad; 4243 } 4244 4245 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 4246 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 4247 } else { 4248 if (hlen == sizeof(struct ip)) { 4249 sum = in_cksum_hdr(ip); 4250 } else { 4251 sum = in_cksum(m, hlen); 4252 } 4253 } 4254 if (sum) { 4255 KMOD_IPSTAT_INC(ips_badsum); 4256 goto bad; 4257 } 4258 4259 /* Retrieve the packet length. */ 4260 len = ntohs(ip->ip_len); 4261 4262 /* 4263 * Check for additional length bogosity 4264 */ 4265 if (len < hlen) { 4266 KMOD_IPSTAT_INC(ips_badlen); 4267 goto bad; 4268 } 4269 4270 /* 4271 * Check that the amount of data in the buffers 4272 * is as at least much as the IP header would have us expect. 4273 * Drop packet if shorter than we expect. 4274 */ 4275 if (m->m_pkthdr.len < len) { 4276 KMOD_IPSTAT_INC(ips_tooshort); 4277 goto bad; 4278 } 4279 4280 /* Checks out, proceed */ 4281 *mp = m; 4282 return (0); 4283 4284 bad: 4285 *mp = m; 4286 return (-1); 4287 } 4288 #endif /* INET */ 4289 4290 #ifdef INET6 4291 /* 4292 * Same as above, but for IPv6. 4293 * Cut-and-pasted from ip6_input.c. 4294 * XXX Should we update ip6stat, or not? 4295 */ 4296 static int 4297 bridge_ip6_checkbasic(struct mbuf **mp) 4298 { 4299 struct mbuf *m = *mp; 4300 struct ip6_hdr *ip6; 4301 4302 /* 4303 * If the IPv6 header is not aligned, slurp it up into a new 4304 * mbuf with space for link headers, in the event we forward 4305 * it. Otherwise, if it is aligned, make sure the entire base 4306 * IPv6 header is in the first mbuf of the chain. 4307 */ 4308 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4309 struct ifnet *inifp = m->m_pkthdr.rcvif; 4310 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 4311 (max_linkhdr + 3) & ~3)) == NULL) { 4312 /* XXXJRT new stat, please */ 4313 IP6STAT_INC(ip6s_toosmall); 4314 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4315 goto bad; 4316 } 4317 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 4318 struct ifnet *inifp = m->m_pkthdr.rcvif; 4319 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 4320 IP6STAT_INC(ip6s_toosmall); 4321 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4322 goto bad; 4323 } 4324 } 4325 4326 ip6 = mtod(m, struct ip6_hdr *); 4327 4328 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 4329 IP6STAT_INC(ip6s_badvers); 4330 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 4331 goto bad; 4332 } 4333 4334 /* Checks out, proceed */ 4335 *mp = m; 4336 return (0); 4337 4338 bad: 4339 *mp = m; 4340 return (-1); 4341 } 4342 #endif /* INET6 */ 4343 4344 #ifdef INET 4345 /* 4346 * bridge_fragment: 4347 * 4348 * Fragment mbuf chain in multiple packets and prepend ethernet header. 4349 */ 4350 static int 4351 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 4352 int snap, struct llc *llc) 4353 { 4354 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 4355 struct ip *ip; 4356 int error = -1; 4357 4358 if (m->m_len < sizeof(struct ip) && 4359 (m = m_pullup(m, sizeof(struct ip))) == NULL) 4360 goto dropit; 4361 ip = mtod(m, struct ip *); 4362 4363 m->m_pkthdr.csum_flags |= CSUM_IP; 4364 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 4365 if (error) 4366 goto dropit; 4367 4368 /* 4369 * Walk the chain and re-add the Ethernet header for 4370 * each mbuf packet. 4371 */ 4372 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 4373 nextpkt = mcur->m_nextpkt; 4374 mcur->m_nextpkt = NULL; 4375 if (snap) { 4376 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 4377 if (mcur == NULL) { 4378 error = ENOBUFS; 4379 if (mprev != NULL) 4380 mprev->m_nextpkt = nextpkt; 4381 goto dropit; 4382 } 4383 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 4384 } 4385 4386 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 4387 if (mcur == NULL) { 4388 error = ENOBUFS; 4389 if (mprev != NULL) 4390 mprev->m_nextpkt = nextpkt; 4391 goto dropit; 4392 } 4393 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 4394 4395 /* 4396 * The previous two M_PREPEND could have inserted one or two 4397 * mbufs in front so we have to update the previous packet's 4398 * m_nextpkt. 4399 */ 4400 mcur->m_nextpkt = nextpkt; 4401 if (mprev != NULL) 4402 mprev->m_nextpkt = mcur; 4403 else { 4404 /* The first mbuf in the original chain needs to be 4405 * updated. */ 4406 *mp = mcur; 4407 } 4408 mprev = mcur; 4409 } 4410 4411 KMOD_IPSTAT_INC(ips_fragmented); 4412 return (error); 4413 4414 dropit: 4415 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 4416 m = mcur->m_nextpkt; 4417 m_freem(mcur); 4418 } 4419 return (error); 4420 } 4421 #endif /* INET */ 4422 4423 static void 4424 bridge_linkstate(struct ifnet *ifp) 4425 { 4426 struct bridge_softc *sc = NULL; 4427 struct bridge_iflist *bif; 4428 struct epoch_tracker et; 4429 4430 NET_EPOCH_ENTER(et); 4431 4432 bif = ifp->if_bridge; 4433 if (bif) 4434 sc = bif->bif_sc; 4435 4436 if (sc != NULL) { 4437 bridge_linkcheck(sc); 4438 bstp_linkstate(&bif->bif_stp); 4439 } 4440 4441 NET_EPOCH_EXIT(et); 4442 } 4443 4444 static void 4445 bridge_linkcheck(struct bridge_softc *sc) 4446 { 4447 struct bridge_iflist *bif; 4448 int new_link, hasls; 4449 4450 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 4451 4452 new_link = LINK_STATE_DOWN; 4453 hasls = 0; 4454 /* Our link is considered up if at least one of our ports is active */ 4455 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 4456 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 4457 hasls++; 4458 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 4459 new_link = LINK_STATE_UP; 4460 break; 4461 } 4462 } 4463 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 4464 /* If no interfaces support link-state then we default to up */ 4465 new_link = LINK_STATE_UP; 4466 } 4467 if_link_state_change(sc->sc_ifp, new_link); 4468 } 4469