1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include "opt_inet.h" 80 #include "opt_inet6.h" 81 82 #define EXTERR_CATEGORY EXTERR_CAT_BRIDGE 83 84 #include <sys/param.h> 85 #include <sys/ctype.h> /* string functions */ 86 #include <sys/eventhandler.h> 87 #include <sys/exterrvar.h> 88 #include <sys/jail.h> 89 #include <sys/kernel.h> 90 #include <sys/lock.h> 91 #include <sys/malloc.h> 92 #include <sys/mbuf.h> 93 #include <sys/module.h> 94 #include <sys/mutex.h> 95 #include <sys/priv.h> 96 #include <sys/proc.h> 97 #include <sys/protosw.h> 98 #include <sys/random.h> 99 #include <sys/systm.h> 100 #include <sys/socket.h> /* for net/if.h */ 101 #include <sys/sockio.h> 102 #include <sys/syslog.h> 103 #include <sys/sysctl.h> 104 #include <sys/time.h> 105 106 #include <vm/uma.h> 107 108 #include <net/bpf.h> 109 #include <net/if.h> 110 #include <net/if_clone.h> 111 #include <net/if_dl.h> 112 #include <net/if_types.h> 113 #include <net/if_var.h> 114 #include <net/if_private.h> 115 #include <net/pfil.h> 116 #include <net/vnet.h> 117 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/in_var.h> 121 #include <netinet/ip.h> 122 #include <netinet/ip_var.h> 123 #ifdef INET6 124 #include <netinet/ip6.h> 125 #include <netinet6/ip6_var.h> 126 #include <netinet6/in6_ifattach.h> 127 #endif 128 #if defined(INET) || defined(INET6) 129 #include <netinet/ip_carp.h> 130 #endif 131 #include <machine/in_cksum.h> 132 #include <netinet/if_ether.h> 133 #include <net/bridgestp.h> 134 #include <net/if_bridgevar.h> 135 #include <net/if_llc.h> 136 #include <net/if_vlan_var.h> 137 138 #include <net/route.h> 139 140 /* 141 * At various points in the code we need to know if we're hooked into the INET 142 * and/or INET6 pfil. Define some macros to do that based on which IP versions 143 * are enabled in the kernel. This avoids littering the rest of the code with 144 * #ifnet INET6 to avoid referencing V_inet6_pfil_head. 145 */ 146 #ifdef INET6 147 #define PFIL_HOOKED_IN_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 148 #define PFIL_HOOKED_OUT_INET6 PFIL_HOOKED_OUT(V_inet6_pfil_head) 149 #else 150 #define PFIL_HOOKED_IN_INET6 false 151 #define PFIL_HOOKED_OUT_INET6 false 152 #endif 153 154 #ifdef INET 155 #define PFIL_HOOKED_IN_INET PFIL_HOOKED_IN(V_inet_pfil_head) 156 #define PFIL_HOOKED_OUT_INET PFIL_HOOKED_OUT(V_inet_pfil_head) 157 #else 158 #define PFIL_HOOKED_IN_INET false 159 #define PFIL_HOOKED_OUT_INET false 160 #endif 161 162 #define PFIL_HOOKED_IN_46 (PFIL_HOOKED_IN_INET6 || PFIL_HOOKED_IN_INET) 163 #define PFIL_HOOKED_OUT_46 (PFIL_HOOKED_OUT_INET6 || PFIL_HOOKED_OUT_INET) 164 165 /* 166 * Size of the route hash table. Must be a power of two. 167 */ 168 #ifndef BRIDGE_RTHASH_SIZE 169 #define BRIDGE_RTHASH_SIZE 1024 170 #endif 171 172 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 173 174 /* 175 * Default maximum number of addresses to cache. 176 */ 177 #ifndef BRIDGE_RTABLE_MAX 178 #define BRIDGE_RTABLE_MAX 2000 179 #endif 180 181 /* 182 * Timeout (in seconds) for entries learned dynamically. 183 */ 184 #ifndef BRIDGE_RTABLE_TIMEOUT 185 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 186 #endif 187 188 /* 189 * Number of seconds between walks of the route list. 190 */ 191 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 192 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 193 #endif 194 195 /* 196 * List of capabilities to possibly mask on the member interface. 197 */ 198 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 199 IFCAP_TXCSUM_IPV6|IFCAP_MEXTPG) 200 201 /* 202 * List of capabilities to strip 203 */ 204 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 205 206 /* 207 * Bridge locking 208 * 209 * The bridge relies heavily on the epoch(9) system to protect its data 210 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 211 * must ensure there is only one writer at a time. 212 * 213 * That is: for read accesses we only need to be in NET_EPOCH, but for write 214 * accesses we must hold: 215 * 216 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 217 * - BRIDGE_LOCK, for any other change 218 * 219 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 220 * calls to bridge member interfaces and these ioctl()s can sleep. 221 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 222 * required while we're in NET_EPOCH and then we're not allowed to sleep. 223 */ 224 #define BRIDGE_LOCK_INIT(_sc) do { \ 225 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 226 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 227 } while (0) 228 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 229 sx_destroy(&(_sc)->sc_sx); \ 230 mtx_destroy(&(_sc)->sc_rt_mtx); \ 231 } while (0) 232 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 233 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 234 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 235 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 236 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 237 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 238 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 239 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 240 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 241 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 242 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 243 244 struct bridge_softc; 245 246 /* 247 * Bridge interface list entry. 248 */ 249 struct bridge_iflist { 250 CK_LIST_ENTRY(bridge_iflist) bif_next; 251 struct ifnet *bif_ifp; /* member if */ 252 struct bridge_softc *bif_sc; /* parent bridge */ 253 struct bstp_port bif_stp; /* STP state */ 254 uint32_t bif_flags; /* member if flags */ 255 int bif_savedcaps; /* saved capabilities */ 256 uint32_t bif_addrmax; /* max # of addresses */ 257 uint32_t bif_addrcnt; /* cur. # of addresses */ 258 uint32_t bif_addrexceeded;/* # of address violations */ 259 struct epoch_context bif_epoch_ctx; 260 ether_vlanid_t bif_pvid; /* port vlan id */ 261 ifbvlan_set_t bif_vlan_set; /* if allowed tagged vlans */ 262 uint16_t bif_vlanproto; /* vlan protocol */ 263 }; 264 265 /* 266 * Bridge route node. 267 */ 268 struct bridge_rtnode { 269 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 270 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 271 struct bridge_iflist *brt_dst; /* destination if */ 272 unsigned long brt_expire; /* expiration time */ 273 uint8_t brt_flags; /* address flags */ 274 uint8_t brt_addr[ETHER_ADDR_LEN]; 275 ether_vlanid_t brt_vlan; /* vlan id */ 276 struct vnet *brt_vnet; 277 struct epoch_context brt_epoch_ctx; 278 }; 279 #define brt_ifp brt_dst->bif_ifp 280 281 /* 282 * Software state for each bridge. 283 */ 284 struct bridge_softc { 285 struct ifnet *sc_ifp; /* make this an interface */ 286 LIST_ENTRY(bridge_softc) sc_list; 287 struct sx sc_sx; 288 struct mtx sc_rt_mtx; 289 uint32_t sc_brtmax; /* max # of addresses */ 290 uint32_t sc_brtcnt; /* cur. # of addresses */ 291 uint32_t sc_brttimeout; /* rt timeout in seconds */ 292 struct callout sc_brcallout; /* bridge callout */ 293 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 294 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 295 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 296 uint32_t sc_rthash_key; /* key for hash */ 297 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 298 struct bstp_state sc_stp; /* STP state */ 299 uint32_t sc_brtexceeded; /* # of cache drops */ 300 struct ifnet *sc_ifaddr; /* member mac copied from */ 301 struct ether_addr sc_defaddr; /* Default MAC address */ 302 if_input_fn_t sc_if_input; /* Saved copy of if_input */ 303 struct epoch_context sc_epoch_ctx; 304 ifbr_flags_t sc_flags; /* bridge flags */ 305 ether_vlanid_t sc_defpvid; /* default PVID */ 306 }; 307 308 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 309 #define V_bridge_list_sx VNET(bridge_list_sx) 310 static eventhandler_tag bridge_detach_cookie; 311 312 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 313 314 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 315 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 316 317 static int bridge_clone_create(struct if_clone *, char *, size_t, 318 struct ifc_data *, struct ifnet **); 319 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 320 321 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 322 static void bridge_mutecaps(struct bridge_softc *); 323 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 324 int); 325 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 326 static void bridge_init(void *); 327 static void bridge_dummynet(struct mbuf *, struct ifnet *); 328 static bool bridge_same(const void *, const void *); 329 static void *bridge_get_softc(struct ifnet *); 330 static void bridge_stop(struct ifnet *, int); 331 static int bridge_transmit(struct ifnet *, struct mbuf *); 332 #ifdef ALTQ 333 static void bridge_altq_start(if_t); 334 static int bridge_altq_transmit(if_t, struct mbuf *); 335 #endif 336 static void bridge_qflush(struct ifnet *); 337 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 338 static void bridge_inject(struct ifnet *, struct mbuf *); 339 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 340 struct rtentry *); 341 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 342 struct mbuf *, struct bridge_iflist *); 343 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 344 345 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 346 struct mbuf *m); 347 static bool bridge_member_ifaddrs(void); 348 static void bridge_timer(void *); 349 350 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 351 struct mbuf *, int); 352 static void bridge_span(struct bridge_softc *, struct mbuf *); 353 354 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 355 ether_vlanid_t, struct bridge_iflist *, int, uint8_t); 356 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 357 ether_vlanid_t); 358 static void bridge_rttrim(struct bridge_softc *); 359 static void bridge_rtage(struct bridge_softc *); 360 static void bridge_rtflush(struct bridge_softc *, int); 361 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 362 ether_vlanid_t); 363 static bool bridge_vfilter_in(const struct bridge_iflist *, struct mbuf *); 364 static bool bridge_vfilter_out(const struct bridge_iflist *, 365 const struct mbuf *); 366 367 static void bridge_rtable_init(struct bridge_softc *); 368 static void bridge_rtable_fini(struct bridge_softc *); 369 370 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 371 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 372 const uint8_t *, ether_vlanid_t); 373 static int bridge_rtnode_insert(struct bridge_softc *, 374 struct bridge_rtnode *); 375 static void bridge_rtnode_destroy(struct bridge_softc *, 376 struct bridge_rtnode *); 377 static void bridge_rtable_expire(struct ifnet *, int); 378 static void bridge_state_change(struct ifnet *, int); 379 380 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 381 const char *name); 382 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 383 struct ifnet *ifp); 384 static void bridge_delete_member(struct bridge_softc *, 385 struct bridge_iflist *, int); 386 static void bridge_delete_span(struct bridge_softc *, 387 struct bridge_iflist *); 388 389 static int bridge_ioctl_add(struct bridge_softc *, void *); 390 static int bridge_ioctl_del(struct bridge_softc *, void *); 391 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 392 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 393 static int bridge_ioctl_scache(struct bridge_softc *, void *); 394 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 395 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 396 static int bridge_ioctl_rts(struct bridge_softc *, void *); 397 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 398 static int bridge_ioctl_sto(struct bridge_softc *, void *); 399 static int bridge_ioctl_gto(struct bridge_softc *, void *); 400 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 401 static int bridge_ioctl_flush(struct bridge_softc *, void *); 402 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 403 static int bridge_ioctl_spri(struct bridge_softc *, void *); 404 static int bridge_ioctl_ght(struct bridge_softc *, void *); 405 static int bridge_ioctl_sht(struct bridge_softc *, void *); 406 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 407 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 408 static int bridge_ioctl_gma(struct bridge_softc *, void *); 409 static int bridge_ioctl_sma(struct bridge_softc *, void *); 410 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 411 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 412 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 413 static int bridge_ioctl_sifpvid(struct bridge_softc *, void *); 414 static int bridge_ioctl_sifvlanset(struct bridge_softc *, void *); 415 static int bridge_ioctl_gifvlanset(struct bridge_softc *, void *); 416 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 417 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 418 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 419 static int bridge_ioctl_grte(struct bridge_softc *, void *); 420 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 421 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 422 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 423 static int bridge_ioctl_gflags(struct bridge_softc *, void *); 424 static int bridge_ioctl_sflags(struct bridge_softc *, void *); 425 static int bridge_ioctl_gdefpvid(struct bridge_softc *, void *); 426 static int bridge_ioctl_sdefpvid(struct bridge_softc *, void *); 427 static int bridge_ioctl_svlanproto(struct bridge_softc *, void *); 428 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 429 int); 430 #ifdef INET 431 static int bridge_ip_checkbasic(struct mbuf **mp); 432 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 433 struct ether_header *, int, struct llc *); 434 #endif /* INET */ 435 #ifdef INET6 436 static int bridge_ip6_checkbasic(struct mbuf **mp); 437 #endif /* INET6 */ 438 static void bridge_linkstate(struct ifnet *ifp); 439 static void bridge_linkcheck(struct bridge_softc *sc); 440 441 /* 442 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2 443 * to indicate untagged frames. 444 */ 445 #define VLANTAGOF(_m) \ 446 ((_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL) 447 448 static struct bstp_cb_ops bridge_ops = { 449 .bcb_state = bridge_state_change, 450 .bcb_rtage = bridge_rtable_expire 451 }; 452 453 SYSCTL_DECL(_net_link); 454 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 455 "Bridge"); 456 457 /* only pass IP[46] packets when pfil is enabled */ 458 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 459 #define V_pfil_onlyip VNET(pfil_onlyip) 460 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 461 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 462 "Only pass IP packets when pfil is enabled"); 463 464 /* run pfil hooks on the bridge interface */ 465 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 466 #define V_pfil_bridge VNET(pfil_bridge) 467 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 468 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 469 "Packet filter on the bridge interface"); 470 471 /* layer2 filter with ipfw */ 472 VNET_DEFINE_STATIC(int, pfil_ipfw); 473 #define V_pfil_ipfw VNET(pfil_ipfw) 474 475 /* layer2 ARP filter with ipfw */ 476 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 477 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 478 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 479 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 480 "Filter ARP packets through IPFW layer2"); 481 482 /* run pfil hooks on the member interface */ 483 VNET_DEFINE_STATIC(int, pfil_member) = 0; 484 #define V_pfil_member VNET(pfil_member) 485 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 486 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 487 "Packet filter on the member interface"); 488 489 /* run pfil hooks on the physical interface for locally destined packets */ 490 VNET_DEFINE_STATIC(int, pfil_local_phys); 491 #define V_pfil_local_phys VNET(pfil_local_phys) 492 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 493 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 494 "Packet filter on the physical interface for locally destined packets"); 495 496 /* log STP state changes */ 497 VNET_DEFINE_STATIC(int, log_stp); 498 #define V_log_stp VNET(log_stp) 499 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 500 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 501 "Log STP state changes"); 502 503 /* share MAC with first bridge member */ 504 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 505 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 506 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 507 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 508 "Inherit MAC address from the first bridge member"); 509 510 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 511 #define V_allow_llz_overlap VNET(allow_llz_overlap) 512 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 513 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 514 "Allow overlap of link-local scope " 515 "zones of a bridge interface and the member interfaces"); 516 517 /* log MAC address port flapping */ 518 VNET_DEFINE_STATIC(bool, log_mac_flap) = true; 519 #define V_log_mac_flap VNET(log_mac_flap) 520 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap, 521 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true, 522 "Log MAC address port flapping"); 523 524 /* allow IP addresses on bridge members */ 525 VNET_DEFINE_STATIC(bool, member_ifaddrs) = true; 526 #define V_member_ifaddrs VNET(member_ifaddrs) 527 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, member_ifaddrs, 528 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(member_ifaddrs), false, 529 "Allow layer 3 addresses on bridge members (deprecated)"); 530 531 static bool 532 bridge_member_ifaddrs(void) 533 { 534 return (V_member_ifaddrs); 535 } 536 537 VNET_DEFINE_STATIC(int, log_interval) = 5; 538 VNET_DEFINE_STATIC(int, log_count) = 0; 539 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 }; 540 541 #define V_log_interval VNET(log_interval) 542 #define V_log_count VNET(log_count) 543 #define V_log_last VNET(log_last) 544 545 struct bridge_control { 546 int (*bc_func)(struct bridge_softc *, void *); 547 int bc_argsize; 548 int bc_flags; 549 }; 550 551 #define BC_F_COPYIN 0x01 /* copy arguments in */ 552 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 553 #define BC_F_SUSER 0x04 /* do super-user check */ 554 555 static const struct bridge_control bridge_control_table[] = { 556 { bridge_ioctl_add, sizeof(struct ifbreq), 557 BC_F_COPYIN|BC_F_SUSER }, 558 { bridge_ioctl_del, sizeof(struct ifbreq), 559 BC_F_COPYIN|BC_F_SUSER }, 560 561 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 562 BC_F_COPYIN|BC_F_COPYOUT }, 563 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 564 BC_F_COPYIN|BC_F_SUSER }, 565 566 { bridge_ioctl_scache, sizeof(struct ifbrparam), 567 BC_F_COPYIN|BC_F_SUSER }, 568 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 569 BC_F_COPYOUT }, 570 571 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 572 BC_F_COPYIN|BC_F_COPYOUT }, 573 { bridge_ioctl_rts, sizeof(struct ifbaconf), 574 BC_F_COPYIN|BC_F_COPYOUT }, 575 576 { bridge_ioctl_saddr, sizeof(struct ifbareq), 577 BC_F_COPYIN|BC_F_SUSER }, 578 579 { bridge_ioctl_sto, sizeof(struct ifbrparam), 580 BC_F_COPYIN|BC_F_SUSER }, 581 { bridge_ioctl_gto, sizeof(struct ifbrparam), 582 BC_F_COPYOUT }, 583 584 { bridge_ioctl_daddr, sizeof(struct ifbareq), 585 BC_F_COPYIN|BC_F_SUSER }, 586 587 { bridge_ioctl_flush, sizeof(struct ifbreq), 588 BC_F_COPYIN|BC_F_SUSER }, 589 590 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 591 BC_F_COPYOUT }, 592 { bridge_ioctl_spri, sizeof(struct ifbrparam), 593 BC_F_COPYIN|BC_F_SUSER }, 594 595 { bridge_ioctl_ght, sizeof(struct ifbrparam), 596 BC_F_COPYOUT }, 597 { bridge_ioctl_sht, sizeof(struct ifbrparam), 598 BC_F_COPYIN|BC_F_SUSER }, 599 600 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 601 BC_F_COPYOUT }, 602 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 603 BC_F_COPYIN|BC_F_SUSER }, 604 605 { bridge_ioctl_gma, sizeof(struct ifbrparam), 606 BC_F_COPYOUT }, 607 { bridge_ioctl_sma, sizeof(struct ifbrparam), 608 BC_F_COPYIN|BC_F_SUSER }, 609 610 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 611 BC_F_COPYIN|BC_F_SUSER }, 612 613 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 614 BC_F_COPYIN|BC_F_SUSER }, 615 616 { bridge_ioctl_addspan, sizeof(struct ifbreq), 617 BC_F_COPYIN|BC_F_SUSER }, 618 { bridge_ioctl_delspan, sizeof(struct ifbreq), 619 BC_F_COPYIN|BC_F_SUSER }, 620 621 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 622 BC_F_COPYOUT }, 623 624 { bridge_ioctl_grte, sizeof(struct ifbrparam), 625 BC_F_COPYOUT }, 626 627 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 628 BC_F_COPYIN|BC_F_COPYOUT }, 629 630 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 631 BC_F_COPYIN|BC_F_SUSER }, 632 633 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 634 BC_F_COPYIN|BC_F_SUSER }, 635 636 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 637 BC_F_COPYIN|BC_F_SUSER }, 638 639 { bridge_ioctl_sifpvid, sizeof(struct ifbreq), 640 BC_F_COPYIN|BC_F_SUSER }, 641 642 { bridge_ioctl_sifvlanset, sizeof(struct ifbif_vlan_req), 643 BC_F_COPYIN|BC_F_SUSER }, 644 645 { bridge_ioctl_gifvlanset, sizeof(struct ifbif_vlan_req), 646 BC_F_COPYIN|BC_F_COPYOUT }, 647 648 { bridge_ioctl_gflags, sizeof(struct ifbrparam), 649 BC_F_COPYOUT }, 650 651 { bridge_ioctl_sflags, sizeof(struct ifbrparam), 652 BC_F_COPYIN|BC_F_SUSER }, 653 654 { bridge_ioctl_gdefpvid, sizeof(struct ifbrparam), 655 BC_F_COPYOUT }, 656 657 { bridge_ioctl_sdefpvid, sizeof(struct ifbrparam), 658 BC_F_COPYIN|BC_F_SUSER }, 659 660 { bridge_ioctl_svlanproto, sizeof(struct ifbreq), 661 BC_F_COPYIN|BC_F_SUSER }, 662 }; 663 static const int bridge_control_table_size = nitems(bridge_control_table); 664 665 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list) = 666 LIST_HEAD_INITIALIZER(); 667 #define V_bridge_list VNET(bridge_list) 668 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 669 "if_bridge list") 670 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 671 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 672 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 673 674 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 675 #define V_bridge_cloner VNET(bridge_cloner) 676 677 static const char bridge_name[] = "bridge"; 678 679 static void 680 vnet_bridge_init(const void *unused __unused) 681 { 682 683 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 684 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 685 UMA_ALIGN_PTR, 0); 686 BRIDGE_LIST_LOCK_INIT(); 687 688 struct if_clone_addreq req = { 689 .create_f = bridge_clone_create, 690 .destroy_f = bridge_clone_destroy, 691 .flags = IFC_F_AUTOUNIT, 692 }; 693 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 694 } 695 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 696 vnet_bridge_init, NULL); 697 698 static void 699 vnet_bridge_uninit(const void *unused __unused) 700 { 701 702 ifc_detach_cloner(V_bridge_cloner); 703 V_bridge_cloner = NULL; 704 BRIDGE_LIST_LOCK_DESTROY(); 705 706 /* Callbacks may use the UMA zone. */ 707 NET_EPOCH_DRAIN_CALLBACKS(); 708 709 uma_zdestroy(V_bridge_rtnode_zone); 710 } 711 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 712 vnet_bridge_uninit, NULL); 713 714 static int 715 bridge_modevent(module_t mod, int type, void *data) 716 { 717 718 switch (type) { 719 case MOD_LOAD: 720 bridge_dn_p = bridge_dummynet; 721 bridge_same_p = bridge_same; 722 bridge_get_softc_p = bridge_get_softc; 723 bridge_member_ifaddrs_p = bridge_member_ifaddrs; 724 bridge_detach_cookie = EVENTHANDLER_REGISTER( 725 ifnet_departure_event, bridge_ifdetach, NULL, 726 EVENTHANDLER_PRI_ANY); 727 break; 728 case MOD_UNLOAD: 729 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 730 bridge_detach_cookie); 731 bridge_dn_p = NULL; 732 bridge_same_p = NULL; 733 bridge_get_softc_p = NULL; 734 bridge_member_ifaddrs_p = NULL; 735 break; 736 default: 737 return (EOPNOTSUPP); 738 } 739 return (0); 740 } 741 742 static moduledata_t bridge_mod = { 743 "if_bridge", 744 bridge_modevent, 745 0 746 }; 747 748 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 749 MODULE_VERSION(if_bridge, 1); 750 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 751 752 /* 753 * handler for net.link.bridge.ipfw 754 */ 755 static int 756 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 757 { 758 int enable = V_pfil_ipfw; 759 int error; 760 761 error = sysctl_handle_int(oidp, &enable, 0, req); 762 enable &= 1; 763 764 if (enable != V_pfil_ipfw) { 765 V_pfil_ipfw = enable; 766 767 /* 768 * Disable pfil so that ipfw doesnt run twice, if the user 769 * really wants both then they can re-enable pfil_bridge and/or 770 * pfil_member. Also allow non-ip packets as ipfw can filter by 771 * layer2 type. 772 */ 773 if (V_pfil_ipfw) { 774 V_pfil_onlyip = 0; 775 V_pfil_bridge = 0; 776 V_pfil_member = 0; 777 } 778 } 779 780 return (error); 781 } 782 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 783 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 784 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 785 "Layer2 filter with IPFW"); 786 787 #ifdef VIMAGE 788 static void 789 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 790 { 791 struct bridge_softc *sc = ifp->if_softc; 792 struct bridge_iflist *bif; 793 794 BRIDGE_LOCK(sc); 795 796 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 797 bridge_delete_member(sc, bif, 0); 798 799 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 800 bridge_delete_span(sc, bif); 801 } 802 803 BRIDGE_UNLOCK(sc); 804 805 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. Skip this check 1452 * for gif interfaces, because the IP address assigned to a gif 1453 * interface is separate from the bridge's Ethernet segment. 1454 */ 1455 if (ifs->if_type != IFT_GIF) { 1456 struct ifaddr *ifa; 1457 1458 CK_STAILQ_FOREACH(ifa, &ifs->if_addrhead, ifa_link) { 1459 if (ifa->ifa_addr->sa_family != AF_INET && 1460 ifa->ifa_addr->sa_family != AF_INET6) 1461 continue; 1462 1463 if (V_member_ifaddrs) { 1464 if_printf(sc->sc_ifp, 1465 "WARNING: Adding member interface %s which " 1466 "has an IP address assigned is deprecated " 1467 "and will be unsupported in a future " 1468 "release.\n", ifs->if_xname); 1469 break; 1470 } else { 1471 return (EXTERROR(EINVAL, 1472 "Member interface may not have " 1473 "an IP address assigned")); 1474 } 1475 } 1476 } 1477 1478 /* Allow the first Ethernet member to define the MTU */ 1479 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1480 sc->sc_ifp->if_mtu = ifs->if_mtu; 1481 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1482 struct ifreq ifr; 1483 1484 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1485 ifs->if_xname); 1486 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1487 1488 error = (*ifs->if_ioctl)(ifs, 1489 SIOCSIFMTU, (caddr_t)&ifr); 1490 if (error != 0) { 1491 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1492 " new member %s\n", sc->sc_ifp->if_xname, 1493 ifr.ifr_mtu, 1494 ifs->if_xname); 1495 return (EXTERROR(EINVAL, 1496 "Failed to set MTU on new member")); 1497 } 1498 } 1499 1500 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1501 if (bif == NULL) 1502 return (ENOMEM); 1503 1504 bif->bif_sc = sc; 1505 bif->bif_ifp = ifs; 1506 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1507 bif->bif_savedcaps = ifs->if_capenable; 1508 bif->bif_vlanproto = ETHERTYPE_VLAN; 1509 bif->bif_pvid = sc->sc_defpvid; 1510 if (sc->sc_flags & IFBRF_DEFQINQ) 1511 bif->bif_flags |= IFBIF_QINQ; 1512 1513 /* 1514 * Assign the interface's MAC address to the bridge if it's the first 1515 * member and the MAC address of the bridge has not been changed from 1516 * the default randomly generated one. 1517 */ 1518 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1519 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1520 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1521 sc->sc_ifaddr = ifs; 1522 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1523 } 1524 1525 ifs->if_bridge = bif; 1526 ifs->if_bridge_output = bridge_output; 1527 ifs->if_bridge_input = bridge_input; 1528 ifs->if_bridge_linkstate = bridge_linkstate; 1529 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1530 /* 1531 * XXX: XLOCK HERE!?! 1532 * 1533 * NOTE: insert_***HEAD*** should be safe for the traversals. 1534 */ 1535 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1536 1537 /* Set interface capabilities to the intersection set of all members */ 1538 bridge_mutecaps(sc); 1539 bridge_linkcheck(sc); 1540 1541 /* Place the interface into promiscuous mode */ 1542 switch (ifs->if_type) { 1543 case IFT_ETHER: 1544 case IFT_L2VLAN: 1545 error = ifpromisc(ifs, 1); 1546 break; 1547 } 1548 1549 if (error) 1550 bridge_delete_member(sc, bif, 0); 1551 return (error); 1552 } 1553 1554 static int 1555 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1556 { 1557 struct ifbreq *req = arg; 1558 struct bridge_iflist *bif; 1559 1560 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1561 if (bif == NULL) 1562 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1563 1564 bridge_delete_member(sc, bif, 0); 1565 1566 return (0); 1567 } 1568 1569 static int 1570 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1571 { 1572 struct ifbreq *req = arg; 1573 struct bridge_iflist *bif; 1574 struct bstp_port *bp; 1575 1576 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1577 if (bif == NULL) 1578 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1579 1580 bp = &bif->bif_stp; 1581 req->ifbr_ifsflags = bif->bif_flags; 1582 req->ifbr_state = bp->bp_state; 1583 req->ifbr_priority = bp->bp_priority; 1584 req->ifbr_path_cost = bp->bp_path_cost; 1585 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1586 req->ifbr_proto = bp->bp_protover; 1587 req->ifbr_role = bp->bp_role; 1588 req->ifbr_stpflags = bp->bp_flags; 1589 req->ifbr_addrcnt = bif->bif_addrcnt; 1590 req->ifbr_addrmax = bif->bif_addrmax; 1591 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1592 req->ifbr_pvid = bif->bif_pvid; 1593 req->ifbr_vlanproto = bif->bif_vlanproto; 1594 1595 /* Copy STP state options as flags */ 1596 if (bp->bp_operedge) 1597 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1598 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1599 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1600 if (bp->bp_ptp_link) 1601 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1602 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1603 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1604 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1605 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1606 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1607 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1608 return (0); 1609 } 1610 1611 static int 1612 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1613 { 1614 struct epoch_tracker et; 1615 struct ifbreq *req = arg; 1616 struct bridge_iflist *bif; 1617 struct bstp_port *bp; 1618 int error; 1619 1620 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1621 if (bif == NULL) 1622 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1623 bp = &bif->bif_stp; 1624 1625 if (req->ifbr_ifsflags & IFBIF_SPAN) 1626 /* SPAN is readonly */ 1627 return (EXTERROR(EINVAL, "Span interface cannot be modified")); 1628 1629 NET_EPOCH_ENTER(et); 1630 1631 if (req->ifbr_ifsflags & IFBIF_STP) { 1632 if ((bif->bif_flags & IFBIF_STP) == 0) { 1633 error = bstp_enable(&bif->bif_stp); 1634 if (error) { 1635 NET_EPOCH_EXIT(et); 1636 return (EXTERROR(error, 1637 "Failed to enable STP")); 1638 } 1639 } 1640 } else { 1641 if ((bif->bif_flags & IFBIF_STP) != 0) 1642 bstp_disable(&bif->bif_stp); 1643 } 1644 1645 /* Pass on STP flags */ 1646 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1647 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1648 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1649 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1650 1651 /* Save the bits relating to the bridge */ 1652 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1653 1654 NET_EPOCH_EXIT(et); 1655 1656 return (0); 1657 } 1658 1659 static int 1660 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1661 { 1662 struct ifbrparam *param = arg; 1663 1664 sc->sc_brtmax = param->ifbrp_csize; 1665 bridge_rttrim(sc); 1666 1667 return (0); 1668 } 1669 1670 static int 1671 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1672 { 1673 struct ifbrparam *param = arg; 1674 1675 param->ifbrp_csize = sc->sc_brtmax; 1676 1677 return (0); 1678 } 1679 1680 static int 1681 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1682 { 1683 struct ifbifconf *bifc = arg; 1684 struct bridge_iflist *bif; 1685 struct ifbreq breq; 1686 char *buf, *outbuf; 1687 int count, buflen, len, error = 0; 1688 1689 count = 0; 1690 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1691 count++; 1692 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1693 count++; 1694 1695 buflen = sizeof(breq) * count; 1696 if (bifc->ifbic_len == 0) { 1697 bifc->ifbic_len = buflen; 1698 return (0); 1699 } 1700 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1701 if (outbuf == NULL) 1702 return (ENOMEM); 1703 1704 count = 0; 1705 buf = outbuf; 1706 len = min(bifc->ifbic_len, buflen); 1707 bzero(&breq, sizeof(breq)); 1708 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1709 if (len < sizeof(breq)) 1710 break; 1711 1712 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1713 sizeof(breq.ifbr_ifsname)); 1714 /* Fill in the ifbreq structure */ 1715 error = bridge_ioctl_gifflags(sc, &breq); 1716 if (error) 1717 break; 1718 memcpy(buf, &breq, sizeof(breq)); 1719 count++; 1720 buf += sizeof(breq); 1721 len -= sizeof(breq); 1722 } 1723 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1724 if (len < sizeof(breq)) 1725 break; 1726 1727 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1728 sizeof(breq.ifbr_ifsname)); 1729 breq.ifbr_ifsflags = bif->bif_flags; 1730 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1731 memcpy(buf, &breq, sizeof(breq)); 1732 count++; 1733 buf += sizeof(breq); 1734 len -= sizeof(breq); 1735 } 1736 1737 bifc->ifbic_len = sizeof(breq) * count; 1738 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1739 free(outbuf, M_TEMP); 1740 return (error); 1741 } 1742 1743 static int 1744 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1745 { 1746 struct ifbaconf *bac = arg; 1747 struct bridge_rtnode *brt; 1748 struct ifbareq bareq; 1749 char *buf, *outbuf; 1750 int count, buflen, len, error = 0; 1751 1752 if (bac->ifbac_len == 0) 1753 return (0); 1754 1755 count = 0; 1756 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1757 count++; 1758 buflen = sizeof(bareq) * count; 1759 1760 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1761 if (outbuf == NULL) 1762 return (ENOMEM); 1763 1764 count = 0; 1765 buf = outbuf; 1766 len = min(bac->ifbac_len, buflen); 1767 bzero(&bareq, sizeof(bareq)); 1768 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1769 if (len < sizeof(bareq)) 1770 goto out; 1771 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1772 sizeof(bareq.ifba_ifsname)); 1773 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1774 bareq.ifba_vlan = brt->brt_vlan; 1775 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1776 time_uptime < brt->brt_expire) 1777 bareq.ifba_expire = brt->brt_expire - time_uptime; 1778 else 1779 bareq.ifba_expire = 0; 1780 bareq.ifba_flags = brt->brt_flags; 1781 1782 memcpy(buf, &bareq, sizeof(bareq)); 1783 count++; 1784 buf += sizeof(bareq); 1785 len -= sizeof(bareq); 1786 } 1787 out: 1788 bac->ifbac_len = sizeof(bareq) * count; 1789 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1790 free(outbuf, M_TEMP); 1791 return (error); 1792 } 1793 1794 static int 1795 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1796 { 1797 struct ifbareq *req = arg; 1798 struct bridge_iflist *bif; 1799 struct epoch_tracker et; 1800 int error; 1801 1802 NET_EPOCH_ENTER(et); 1803 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1804 if (bif == NULL) { 1805 NET_EPOCH_EXIT(et); 1806 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1807 } 1808 1809 /* bridge_rtupdate() may acquire the lock. */ 1810 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1811 req->ifba_flags); 1812 NET_EPOCH_EXIT(et); 1813 1814 return (error); 1815 } 1816 1817 static int 1818 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1819 { 1820 struct ifbrparam *param = arg; 1821 1822 sc->sc_brttimeout = param->ifbrp_ctime; 1823 return (0); 1824 } 1825 1826 static int 1827 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1828 { 1829 struct ifbrparam *param = arg; 1830 1831 param->ifbrp_ctime = sc->sc_brttimeout; 1832 return (0); 1833 } 1834 1835 static int 1836 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1837 { 1838 struct ifbareq *req = arg; 1839 int vlan = req->ifba_vlan; 1840 1841 /* Userspace uses '0' to mean 'any vlan' */ 1842 if (vlan == 0) 1843 vlan = DOT1Q_VID_RSVD_IMPL; 1844 1845 return (bridge_rtdaddr(sc, req->ifba_dst, vlan)); 1846 } 1847 1848 static int 1849 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1850 { 1851 struct ifbreq *req = arg; 1852 1853 BRIDGE_RT_LOCK(sc); 1854 bridge_rtflush(sc, req->ifbr_ifsflags); 1855 BRIDGE_RT_UNLOCK(sc); 1856 1857 return (0); 1858 } 1859 1860 static int 1861 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1862 { 1863 struct ifbrparam *param = arg; 1864 struct bstp_state *bs = &sc->sc_stp; 1865 1866 param->ifbrp_prio = bs->bs_bridge_priority; 1867 return (0); 1868 } 1869 1870 static int 1871 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1872 { 1873 struct ifbrparam *param = arg; 1874 1875 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1876 } 1877 1878 static int 1879 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1880 { 1881 struct ifbrparam *param = arg; 1882 struct bstp_state *bs = &sc->sc_stp; 1883 1884 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1885 return (0); 1886 } 1887 1888 static int 1889 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1890 { 1891 struct ifbrparam *param = arg; 1892 1893 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1894 } 1895 1896 static int 1897 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1898 { 1899 struct ifbrparam *param = arg; 1900 struct bstp_state *bs = &sc->sc_stp; 1901 1902 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1903 return (0); 1904 } 1905 1906 static int 1907 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1908 { 1909 struct ifbrparam *param = arg; 1910 1911 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1912 } 1913 1914 static int 1915 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1916 { 1917 struct ifbrparam *param = arg; 1918 struct bstp_state *bs = &sc->sc_stp; 1919 1920 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1921 return (0); 1922 } 1923 1924 static int 1925 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1926 { 1927 struct ifbrparam *param = arg; 1928 1929 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1930 } 1931 1932 static int 1933 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1934 { 1935 struct ifbreq *req = arg; 1936 struct bridge_iflist *bif; 1937 1938 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1939 if (bif == NULL) 1940 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1941 1942 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1943 } 1944 1945 static int 1946 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1947 { 1948 struct ifbreq *req = arg; 1949 struct bridge_iflist *bif; 1950 1951 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1952 if (bif == NULL) 1953 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1954 1955 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1956 } 1957 1958 static int 1959 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1960 { 1961 struct ifbreq *req = arg; 1962 struct bridge_iflist *bif; 1963 1964 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1965 if (bif == NULL) 1966 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1967 1968 bif->bif_addrmax = req->ifbr_addrmax; 1969 return (0); 1970 } 1971 1972 static int 1973 bridge_ioctl_sifpvid(struct bridge_softc *sc, void *arg) 1974 { 1975 struct ifbreq *req = arg; 1976 struct bridge_iflist *bif; 1977 1978 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1979 if (bif == NULL) 1980 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 1981 1982 if (req->ifbr_pvid > DOT1Q_VID_MAX) 1983 return (EXTERROR(EINVAL, "Invalid VLAN ID")); 1984 1985 bif->bif_pvid = req->ifbr_pvid; 1986 return (0); 1987 } 1988 1989 static int 1990 bridge_ioctl_sifvlanset(struct bridge_softc *sc, void *arg) 1991 { 1992 struct ifbif_vlan_req *req = arg; 1993 struct bridge_iflist *bif; 1994 1995 if ((sc->sc_flags & IFBRF_VLANFILTER) == 0) 1996 return (EXTERROR(EINVAL, "VLAN filtering not enabled")); 1997 1998 bif = bridge_lookup_member(sc, req->bv_ifname); 1999 if (bif == NULL) 2000 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2001 2002 /* Reject invalid VIDs. */ 2003 if (BRVLAN_TEST(&req->bv_set, DOT1Q_VID_NULL) || 2004 BRVLAN_TEST(&req->bv_set, DOT1Q_VID_RSVD_IMPL)) 2005 return (EXTERROR(EINVAL, "Invalid VLAN ID in set")); 2006 2007 switch (req->bv_op) { 2008 /* Replace the existing vlan set with the new set */ 2009 case BRDG_VLAN_OP_SET: 2010 BIT_COPY(BRVLAN_SETSIZE, &req->bv_set, &bif->bif_vlan_set); 2011 break; 2012 2013 /* Modify the existing vlan set to add the given vlans */ 2014 case BRDG_VLAN_OP_ADD: 2015 BIT_OR(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2016 break; 2017 2018 /* Modify the existing vlan set to remove the given vlans */ 2019 case BRDG_VLAN_OP_DEL: 2020 BIT_ANDNOT(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2021 break; 2022 2023 /* Invalid or unknown operation */ 2024 default: 2025 return (EXTERROR(EINVAL, 2026 "Unsupported BRDGSIFVLANSET operation")); 2027 } 2028 2029 return (0); 2030 } 2031 2032 static int 2033 bridge_ioctl_gifvlanset(struct bridge_softc *sc, void *arg) 2034 { 2035 struct ifbif_vlan_req *req = arg; 2036 struct bridge_iflist *bif; 2037 2038 bif = bridge_lookup_member(sc, req->bv_ifname); 2039 if (bif == NULL) 2040 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2041 2042 BIT_COPY(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set); 2043 return (0); 2044 } 2045 2046 static int 2047 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 2048 { 2049 struct ifbreq *req = arg; 2050 struct bridge_iflist *bif = NULL; 2051 struct ifnet *ifs; 2052 2053 ifs = ifunit(req->ifbr_ifsname); 2054 if (ifs == NULL) 2055 return (EXTERROR(ENOENT, "No such interface")); 2056 2057 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2058 if (ifs == bif->bif_ifp) 2059 return (EXTERROR(EBUSY, 2060 "Interface is already a span port")); 2061 2062 if (ifs->if_bridge != NULL) 2063 return (EXTERROR(EEXIST, 2064 "Interface is already a bridge member")); 2065 2066 switch (ifs->if_type) { 2067 case IFT_ETHER: 2068 case IFT_GIF: 2069 case IFT_L2VLAN: 2070 break; 2071 default: 2072 return (EXTERROR(EINVAL, "Unsupported interface type")); 2073 } 2074 2075 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 2076 if (bif == NULL) 2077 return (ENOMEM); 2078 2079 bif->bif_ifp = ifs; 2080 bif->bif_flags = IFBIF_SPAN; 2081 2082 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 2083 2084 return (0); 2085 } 2086 2087 static int 2088 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 2089 { 2090 struct ifbreq *req = arg; 2091 struct bridge_iflist *bif; 2092 struct ifnet *ifs; 2093 2094 ifs = ifunit(req->ifbr_ifsname); 2095 if (ifs == NULL) 2096 return (EXTERROR(ENOENT, "No such interface")); 2097 2098 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2099 if (ifs == bif->bif_ifp) 2100 break; 2101 2102 if (bif == NULL) 2103 return (EXTERROR(ENOENT, "Interface is not a span port")); 2104 2105 bridge_delete_span(sc, bif); 2106 2107 return (0); 2108 } 2109 2110 static int 2111 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 2112 { 2113 struct ifbropreq *req = arg; 2114 struct bstp_state *bs = &sc->sc_stp; 2115 struct bstp_port *root_port; 2116 2117 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 2118 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 2119 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 2120 2121 root_port = bs->bs_root_port; 2122 if (root_port == NULL) 2123 req->ifbop_root_port = 0; 2124 else 2125 req->ifbop_root_port = root_port->bp_ifp->if_index; 2126 2127 req->ifbop_holdcount = bs->bs_txholdcount; 2128 req->ifbop_priority = bs->bs_bridge_priority; 2129 req->ifbop_protocol = bs->bs_protover; 2130 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 2131 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 2132 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 2133 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 2134 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 2135 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 2136 2137 return (0); 2138 } 2139 2140 static int 2141 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 2142 { 2143 struct ifbrparam *param = arg; 2144 2145 param->ifbrp_cexceeded = sc->sc_brtexceeded; 2146 return (0); 2147 } 2148 2149 static int 2150 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 2151 { 2152 struct ifbpstpconf *bifstp = arg; 2153 struct bridge_iflist *bif; 2154 struct bstp_port *bp; 2155 struct ifbpstpreq bpreq; 2156 char *buf, *outbuf; 2157 int count, buflen, len, error = 0; 2158 2159 count = 0; 2160 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2161 if ((bif->bif_flags & IFBIF_STP) != 0) 2162 count++; 2163 } 2164 2165 buflen = sizeof(bpreq) * count; 2166 if (bifstp->ifbpstp_len == 0) { 2167 bifstp->ifbpstp_len = buflen; 2168 return (0); 2169 } 2170 2171 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 2172 if (outbuf == NULL) 2173 return (ENOMEM); 2174 2175 count = 0; 2176 buf = outbuf; 2177 len = min(bifstp->ifbpstp_len, buflen); 2178 bzero(&bpreq, sizeof(bpreq)); 2179 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2180 if (len < sizeof(bpreq)) 2181 break; 2182 2183 if ((bif->bif_flags & IFBIF_STP) == 0) 2184 continue; 2185 2186 bp = &bif->bif_stp; 2187 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 2188 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 2189 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 2190 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 2191 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 2192 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 2193 2194 memcpy(buf, &bpreq, sizeof(bpreq)); 2195 count++; 2196 buf += sizeof(bpreq); 2197 len -= sizeof(bpreq); 2198 } 2199 2200 bifstp->ifbpstp_len = sizeof(bpreq) * count; 2201 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 2202 free(outbuf, M_TEMP); 2203 return (error); 2204 } 2205 2206 static int 2207 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 2208 { 2209 struct ifbrparam *param = arg; 2210 2211 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 2212 } 2213 2214 static int 2215 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 2216 { 2217 struct ifbrparam *param = arg; 2218 2219 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 2220 } 2221 2222 static int 2223 bridge_ioctl_gflags(struct bridge_softc *sc, void *arg) 2224 { 2225 struct ifbrparam *param = arg; 2226 2227 param->ifbrp_flags = sc->sc_flags; 2228 2229 return (0); 2230 } 2231 2232 static int 2233 bridge_ioctl_sflags(struct bridge_softc *sc, void *arg) 2234 { 2235 struct ifbrparam *param = arg; 2236 2237 sc->sc_flags = param->ifbrp_flags; 2238 2239 return (0); 2240 } 2241 2242 static int 2243 bridge_ioctl_gdefpvid(struct bridge_softc *sc, void *arg) 2244 { 2245 struct ifbrparam *param = arg; 2246 2247 param->ifbrp_defpvid = sc->sc_defpvid; 2248 2249 return (0); 2250 } 2251 2252 static int 2253 bridge_ioctl_sdefpvid(struct bridge_softc *sc, void *arg) 2254 { 2255 struct ifbrparam *param = arg; 2256 2257 /* Reject invalid VIDs, but allow 0 to mean 'none'. */ 2258 if (param->ifbrp_defpvid > DOT1Q_VID_MAX) 2259 return (EINVAL); 2260 2261 sc->sc_defpvid = param->ifbrp_defpvid; 2262 2263 return (0); 2264 } 2265 2266 static int 2267 bridge_ioctl_svlanproto(struct bridge_softc *sc, void *arg) 2268 { 2269 struct ifbreq *req = arg; 2270 struct bridge_iflist *bif; 2271 2272 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 2273 if (bif == NULL) 2274 return (EXTERROR(ENOENT, "Interface is not a bridge member")); 2275 2276 if (req->ifbr_vlanproto != ETHERTYPE_VLAN && 2277 req->ifbr_vlanproto != ETHERTYPE_QINQ) 2278 return (EXTERROR(EINVAL, "Invalid VLAN protocol")); 2279 2280 bif->bif_vlanproto = req->ifbr_vlanproto; 2281 2282 return (0); 2283 } 2284 /* 2285 * bridge_ifdetach: 2286 * 2287 * Detach an interface from a bridge. Called when a member 2288 * interface is detaching. 2289 */ 2290 static void 2291 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 2292 { 2293 struct bridge_iflist *bif = ifp->if_bridge; 2294 struct bridge_softc *sc = NULL; 2295 2296 if (bif) 2297 sc = bif->bif_sc; 2298 2299 if (ifp->if_flags & IFF_RENAMING) 2300 return; 2301 if (V_bridge_cloner == NULL) { 2302 /* 2303 * This detach handler can be called after 2304 * vnet_bridge_uninit(). Just return in that case. 2305 */ 2306 return; 2307 } 2308 /* Check if the interface is a bridge member */ 2309 if (sc != NULL) { 2310 BRIDGE_LOCK(sc); 2311 bridge_delete_member(sc, bif, 1); 2312 BRIDGE_UNLOCK(sc); 2313 return; 2314 } 2315 2316 /* Check if the interface is a span port */ 2317 BRIDGE_LIST_LOCK(); 2318 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 2319 BRIDGE_LOCK(sc); 2320 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 2321 if (ifp == bif->bif_ifp) { 2322 bridge_delete_span(sc, bif); 2323 break; 2324 } 2325 2326 BRIDGE_UNLOCK(sc); 2327 } 2328 BRIDGE_LIST_UNLOCK(); 2329 } 2330 2331 /* 2332 * bridge_init: 2333 * 2334 * Initialize a bridge interface. 2335 */ 2336 static void 2337 bridge_init(void *xsc) 2338 { 2339 struct bridge_softc *sc = (struct bridge_softc *)xsc; 2340 struct ifnet *ifp = sc->sc_ifp; 2341 2342 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2343 return; 2344 2345 BRIDGE_LOCK(sc); 2346 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 2347 bridge_timer, sc); 2348 2349 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2350 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 2351 2352 BRIDGE_UNLOCK(sc); 2353 } 2354 2355 /* 2356 * bridge_stop: 2357 * 2358 * Stop the bridge interface. 2359 */ 2360 static void 2361 bridge_stop(struct ifnet *ifp, int disable) 2362 { 2363 struct bridge_softc *sc = ifp->if_softc; 2364 2365 BRIDGE_LOCK_ASSERT(sc); 2366 2367 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2368 return; 2369 2370 BRIDGE_RT_LOCK(sc); 2371 callout_stop(&sc->sc_brcallout); 2372 2373 bstp_stop(&sc->sc_stp); 2374 2375 bridge_rtflush(sc, IFBF_FLUSHDYN); 2376 BRIDGE_RT_UNLOCK(sc); 2377 2378 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2379 } 2380 2381 /* 2382 * bridge_enqueue: 2383 * 2384 * Enqueue a packet on a bridge member interface. 2385 * 2386 */ 2387 static int 2388 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 2389 struct bridge_iflist *bif) 2390 { 2391 int len, err = 0; 2392 short mflags; 2393 struct mbuf *m0; 2394 2395 /* 2396 * Find the bridge member port this packet is being sent on, if the 2397 * caller didn't already provide it. 2398 */ 2399 if (bif == NULL) 2400 bif = bridge_lookup_member_if(sc, dst_ifp); 2401 if (bif == NULL) { 2402 /* Perhaps the interface was removed from the bridge */ 2403 m_freem(m); 2404 return (EINVAL); 2405 } 2406 2407 /* Do VLAN filtering. */ 2408 if (!bridge_vfilter_out(bif, m)) { 2409 m_freem(m); 2410 return (0); 2411 } 2412 2413 /* We may be sending a fragment so traverse the mbuf */ 2414 for (; m; m = m0) { 2415 m0 = m->m_nextpkt; 2416 m->m_nextpkt = NULL; 2417 len = m->m_pkthdr.len; 2418 mflags = m->m_flags; 2419 2420 /* 2421 * If the native VLAN ID of the outgoing interface matches the 2422 * VLAN ID of the frame, remove the VLAN tag. 2423 */ 2424 if (bif->bif_pvid != DOT1Q_VID_NULL && 2425 VLANTAGOF(m) == bif->bif_pvid) { 2426 m->m_flags &= ~M_VLANTAG; 2427 m->m_pkthdr.ether_vtag = 0; 2428 } 2429 2430 /* 2431 * There are two cases where we have to insert our own tag: 2432 * if the member interface doesn't support hardware tagging, 2433 * or if the tag proto is not 802.1q. 2434 */ 2435 if ((m->m_flags & M_VLANTAG) && 2436 ((dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0 || 2437 bif->bif_vlanproto != ETHERTYPE_VLAN)) { 2438 m = ether_vlanencap_proto(m, m->m_pkthdr.ether_vtag, 2439 bif->bif_vlanproto); 2440 if (m == NULL) { 2441 if_printf(dst_ifp, 2442 "unable to prepend VLAN header\n"); 2443 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2444 continue; 2445 } 2446 m->m_flags &= ~M_VLANTAG; 2447 } 2448 2449 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2450 /* 2451 * XXXZL: gif(4) requires the af to be saved in csum_data field 2452 * so that gif_transmit() routine can pull it back. 2453 */ 2454 if (dst_ifp->if_type == IFT_GIF) 2455 m->m_pkthdr.csum_data = AF_LINK; 2456 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2457 int n; 2458 2459 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2460 m0 = m->m_nextpkt; 2461 m_freem(m); 2462 } 2463 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2464 break; 2465 } 2466 2467 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2468 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2469 if (mflags & M_MCAST) 2470 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2471 } 2472 2473 return (err); 2474 } 2475 2476 /* 2477 * bridge_dummynet: 2478 * 2479 * Receive a queued packet from dummynet and pass it on to the output 2480 * interface. 2481 * 2482 * The mbuf has the Ethernet header already attached. 2483 */ 2484 static void 2485 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2486 { 2487 struct bridge_iflist *bif = ifp->if_bridge; 2488 struct bridge_softc *sc = NULL; 2489 2490 if (bif) 2491 sc = bif->bif_sc; 2492 2493 /* 2494 * The packet didnt originate from a member interface. This should only 2495 * ever happen if a member interface is removed while packets are 2496 * queued for it. 2497 */ 2498 if (sc == NULL) { 2499 m_freem(m); 2500 return; 2501 } 2502 2503 if (PFIL_HOOKED_OUT_46) { 2504 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2505 return; 2506 if (m == NULL) 2507 return; 2508 } 2509 2510 bridge_enqueue(sc, ifp, m, NULL); 2511 } 2512 2513 /* 2514 * bridge_output: 2515 * 2516 * Send output from a bridge member interface. This 2517 * performs the bridging function for locally originated 2518 * packets. 2519 * 2520 * The mbuf has the Ethernet header already attached. We must 2521 * enqueue or free the mbuf before returning. 2522 */ 2523 static int 2524 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2525 struct rtentry *rt) 2526 { 2527 struct ether_header *eh; 2528 struct bridge_iflist *sbif; 2529 struct ifnet *bifp, *dst_if; 2530 struct bridge_softc *sc; 2531 ether_vlanid_t vlan; 2532 2533 NET_EPOCH_ASSERT(); 2534 2535 if (m->m_len < ETHER_HDR_LEN) { 2536 m = m_pullup(m, ETHER_HDR_LEN); 2537 if (m == NULL) 2538 return (0); 2539 } 2540 2541 sbif = ifp->if_bridge; 2542 sc = sbif->bif_sc; 2543 bifp = sc->sc_ifp; 2544 2545 eh = mtod(m, struct ether_header *); 2546 vlan = VLANTAGOF(m); 2547 2548 /* 2549 * If bridge is down, but the original output interface is up, 2550 * go ahead and send out that interface. Otherwise, the packet 2551 * is dropped below. 2552 */ 2553 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2554 dst_if = ifp; 2555 goto sendunicast; 2556 } 2557 2558 /* 2559 * If the packet is a multicast, or we don't know a better way to 2560 * get there, send to all interfaces. 2561 */ 2562 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2563 dst_if = NULL; 2564 else 2565 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2566 /* Tap any traffic not passing back out the originating interface */ 2567 if (dst_if != ifp) 2568 ETHER_BPF_MTAP(bifp, m); 2569 if (dst_if == NULL) { 2570 struct bridge_iflist *bif; 2571 struct mbuf *mc; 2572 int used = 0; 2573 2574 bridge_span(sc, m); 2575 2576 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2577 dst_if = bif->bif_ifp; 2578 2579 if (dst_if->if_type == IFT_GIF) 2580 continue; 2581 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2582 continue; 2583 2584 /* 2585 * If this is not the original output interface, 2586 * and the interface is participating in spanning 2587 * tree, make sure the port is in a state that 2588 * allows forwarding. 2589 */ 2590 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2591 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2592 continue; 2593 2594 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2595 used = 1; 2596 mc = m; 2597 } else { 2598 mc = m_dup(m, M_NOWAIT); 2599 if (mc == NULL) { 2600 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2601 continue; 2602 } 2603 } 2604 2605 bridge_enqueue(sc, dst_if, mc, bif); 2606 } 2607 if (used == 0) 2608 m_freem(m); 2609 return (0); 2610 } 2611 2612 sendunicast: 2613 /* 2614 * XXX Spanning tree consideration here? 2615 */ 2616 2617 bridge_span(sc, m); 2618 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2619 m_freem(m); 2620 return (0); 2621 } 2622 2623 bridge_enqueue(sc, dst_if, m, NULL); 2624 return (0); 2625 } 2626 2627 /* 2628 * bridge_transmit: 2629 * 2630 * Do output on a bridge. 2631 * 2632 */ 2633 static int 2634 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2635 { 2636 struct bridge_softc *sc; 2637 struct ether_header *eh; 2638 struct ifnet *dst_if; 2639 int error = 0; 2640 ether_vlanid_t vlan; 2641 2642 sc = ifp->if_softc; 2643 2644 ETHER_BPF_MTAP(ifp, m); 2645 2646 eh = mtod(m, struct ether_header *); 2647 vlan = VLANTAGOF(m); 2648 2649 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2650 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan)) != NULL) { 2651 error = bridge_enqueue(sc, dst_if, m, NULL); 2652 } else 2653 bridge_broadcast(sc, ifp, m, 0); 2654 2655 return (error); 2656 } 2657 2658 #ifdef ALTQ 2659 static void 2660 bridge_altq_start(if_t ifp) 2661 { 2662 struct ifaltq *ifq = &ifp->if_snd; 2663 struct mbuf *m; 2664 2665 IFQ_LOCK(ifq); 2666 IFQ_DEQUEUE_NOLOCK(ifq, m); 2667 while (m != NULL) { 2668 bridge_transmit(ifp, m); 2669 IFQ_DEQUEUE_NOLOCK(ifq, m); 2670 } 2671 IFQ_UNLOCK(ifq); 2672 } 2673 2674 static int 2675 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2676 { 2677 int err; 2678 2679 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2680 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2681 if (err == 0) 2682 bridge_altq_start(ifp); 2683 } else 2684 err = bridge_transmit(ifp, m); 2685 2686 return (err); 2687 } 2688 #endif /* ALTQ */ 2689 2690 /* 2691 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2692 */ 2693 static void 2694 bridge_qflush(struct ifnet *ifp __unused) 2695 { 2696 } 2697 2698 /* 2699 * bridge_forward: 2700 * 2701 * The forwarding function of the bridge. 2702 * 2703 * NOTE: Releases the lock on return. 2704 */ 2705 static void 2706 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2707 struct mbuf *m) 2708 { 2709 struct bridge_iflist *dbif; 2710 struct ifnet *src_if, *dst_if, *ifp; 2711 struct ether_header *eh; 2712 uint8_t *dst; 2713 int error; 2714 ether_vlanid_t vlan; 2715 2716 NET_EPOCH_ASSERT(); 2717 2718 src_if = m->m_pkthdr.rcvif; 2719 ifp = sc->sc_ifp; 2720 vlan = VLANTAGOF(m); 2721 2722 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2723 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2724 2725 if ((sbif->bif_flags & IFBIF_STP) && 2726 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2727 goto drop; 2728 2729 eh = mtod(m, struct ether_header *); 2730 dst = eh->ether_dhost; 2731 2732 /* If the interface is learning, record the address. */ 2733 if (sbif->bif_flags & IFBIF_LEARNING) { 2734 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2735 sbif, 0, IFBAF_DYNAMIC); 2736 /* 2737 * If the interface has addresses limits then deny any source 2738 * that is not in the cache. 2739 */ 2740 if (error && sbif->bif_addrmax) 2741 goto drop; 2742 } 2743 2744 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2745 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2746 goto drop; 2747 2748 #ifdef DEV_NETMAP 2749 /* 2750 * Hand the packet to netmap only if it wasn't injected by netmap 2751 * itself. 2752 */ 2753 if ((m->m_flags & M_BRIDGE_INJECT) == 0 && 2754 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) { 2755 ifp->if_input(ifp, m); 2756 return; 2757 } 2758 m->m_flags &= ~M_BRIDGE_INJECT; 2759 #endif 2760 2761 /* 2762 * At this point, the port either doesn't participate 2763 * in spanning tree or it is in the forwarding state. 2764 */ 2765 2766 /* 2767 * If the packet is unicast, destined for someone on 2768 * "this" side of the bridge, drop it. 2769 */ 2770 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2771 dst_if = bridge_rtlookup(sc, dst, vlan); 2772 if (src_if == dst_if) 2773 goto drop; 2774 } else { 2775 /* 2776 * Check if its a reserved multicast address, any address 2777 * listed in 802.1D section 7.12.6 may not be forwarded by the 2778 * bridge. 2779 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2780 */ 2781 if (dst[0] == 0x01 && dst[1] == 0x80 && 2782 dst[2] == 0xc2 && dst[3] == 0x00 && 2783 dst[4] == 0x00 && dst[5] <= 0x0f) 2784 goto drop; 2785 2786 /* ...forward it to all interfaces. */ 2787 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2788 dst_if = NULL; 2789 } 2790 2791 /* 2792 * If we have a destination interface which is a member of our bridge, 2793 * OR this is a unicast packet, push it through the bpf(4) machinery. 2794 * For broadcast or multicast packets, don't bother because it will 2795 * be reinjected into ether_input. We do this before we pass the packets 2796 * through the pfil(9) framework, as it is possible that pfil(9) will 2797 * drop the packet, or possibly modify it, making it difficult to debug 2798 * firewall issues on the bridge. 2799 */ 2800 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2801 ETHER_BPF_MTAP(ifp, m); 2802 2803 /* run the packet filter */ 2804 if (PFIL_HOOKED_IN_46) { 2805 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2806 return; 2807 if (m == NULL) 2808 return; 2809 } 2810 2811 if (dst_if == NULL) { 2812 bridge_broadcast(sc, src_if, m, 1); 2813 return; 2814 } 2815 2816 /* 2817 * At this point, we're dealing with a unicast frame 2818 * going to a different interface. 2819 */ 2820 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2821 goto drop; 2822 2823 dbif = bridge_lookup_member_if(sc, dst_if); 2824 if (dbif == NULL) 2825 /* Not a member of the bridge (anymore?) */ 2826 goto drop; 2827 2828 /* Private segments can not talk to each other */ 2829 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2830 goto drop; 2831 2832 if ((dbif->bif_flags & IFBIF_STP) && 2833 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2834 goto drop; 2835 2836 if (PFIL_HOOKED_OUT_46) { 2837 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2838 return; 2839 if (m == NULL) 2840 return; 2841 } 2842 2843 bridge_enqueue(sc, dst_if, m, dbif); 2844 return; 2845 2846 drop: 2847 m_freem(m); 2848 } 2849 2850 /* 2851 * bridge_input: 2852 * 2853 * Receive input from a member interface. Queue the packet for 2854 * bridging if it is not for us. 2855 */ 2856 static struct mbuf * 2857 bridge_input(struct ifnet *ifp, struct mbuf *m) 2858 { 2859 struct bridge_softc *sc = NULL; 2860 struct bridge_iflist *bif, *bif2; 2861 struct ifnet *bifp; 2862 struct ether_header *eh; 2863 struct mbuf *mc, *mc2; 2864 ether_vlanid_t vlan; 2865 int error; 2866 2867 NET_EPOCH_ASSERT(); 2868 2869 /* We need the Ethernet header later, so make sure we have it now. */ 2870 if (m->m_len < ETHER_HDR_LEN) { 2871 m = m_pullup(m, ETHER_HDR_LEN); 2872 if (m == NULL) { 2873 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2874 m_freem(m); 2875 return (NULL); 2876 } 2877 } 2878 2879 eh = mtod(m, struct ether_header *); 2880 vlan = VLANTAGOF(m); 2881 2882 /* 2883 * If this frame has a VLAN tag and the receiving interface has a 2884 * vlan(4) trunk, then it is is destined for vlan(4), not for us. 2885 * This means if vlan(4) and bridge(4) are configured on the same 2886 * interface, vlan(4) is preferred, which is what users typically 2887 * expect. 2888 */ 2889 if (vlan != DOT1Q_VID_NULL && ifp->if_vlantrunk != NULL) 2890 return (m); 2891 2892 bif = ifp->if_bridge; 2893 if (bif) 2894 sc = bif->bif_sc; 2895 2896 if (sc == NULL) { 2897 /* 2898 * This packet originated from the bridge itself, so it must 2899 * have been transmitted by netmap. Derive the "source" 2900 * interface from the source address and drop the packet if the 2901 * source address isn't known. 2902 */ 2903 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0, 2904 ("%s: ifnet %p missing a bridge softc", __func__, ifp)); 2905 sc = if_getsoftc(ifp); 2906 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan); 2907 if (ifp == NULL) { 2908 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2909 m_freem(m); 2910 return (NULL); 2911 } 2912 m->m_pkthdr.rcvif = ifp; 2913 } 2914 bifp = sc->sc_ifp; 2915 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2916 return (m); 2917 2918 /* 2919 * Implement support for bridge monitoring. If this flag has been 2920 * set on this interface, discard the packet once we push it through 2921 * the bpf(4) machinery, but before we do, increment the byte and 2922 * packet counters associated with this interface. 2923 */ 2924 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2925 m->m_pkthdr.rcvif = bifp; 2926 ETHER_BPF_MTAP(bifp, m); 2927 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2928 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2929 m_freem(m); 2930 return (NULL); 2931 } 2932 2933 /* Do VLAN filtering. */ 2934 if (!bridge_vfilter_in(bif, m)) { 2935 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1); 2936 m_freem(m); 2937 return (NULL); 2938 } 2939 /* bridge_vfilter_in() may add a tag */ 2940 vlan = VLANTAGOF(m); 2941 2942 bridge_span(sc, m); 2943 2944 if (m->m_flags & (M_BCAST|M_MCAST)) { 2945 /* Tap off 802.1D packets; they do not get forwarded. */ 2946 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2947 ETHER_ADDR_LEN) == 0) { 2948 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2949 return (NULL); 2950 } 2951 2952 if ((bif->bif_flags & IFBIF_STP) && 2953 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2954 return (m); 2955 } 2956 2957 /* 2958 * Make a deep copy of the packet and enqueue the copy 2959 * for bridge processing; return the original packet for 2960 * local processing. 2961 */ 2962 mc = m_dup(m, M_NOWAIT); 2963 if (mc == NULL) { 2964 return (m); 2965 } 2966 2967 /* Perform the bridge forwarding function with the copy. */ 2968 bridge_forward(sc, bif, mc); 2969 2970 #ifdef DEV_NETMAP 2971 /* 2972 * If netmap is enabled and has not already seen this packet, 2973 * then it will be consumed by bridge_forward(). 2974 */ 2975 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 && 2976 (m->m_flags & M_BRIDGE_INJECT) == 0) { 2977 m_freem(m); 2978 return (NULL); 2979 } 2980 #endif 2981 2982 /* 2983 * Reinject the mbuf as arriving on the bridge so we have a 2984 * chance at claiming multicast packets. We can not loop back 2985 * here from ether_input as a bridge is never a member of a 2986 * bridge. 2987 */ 2988 KASSERT(bifp->if_bridge == NULL, 2989 ("loop created in bridge_input")); 2990 mc2 = m_dup(m, M_NOWAIT); 2991 if (mc2 != NULL) { 2992 /* Keep the layer3 header aligned */ 2993 int i = min(mc2->m_pkthdr.len, max_protohdr); 2994 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2995 } 2996 if (mc2 != NULL) { 2997 mc2->m_pkthdr.rcvif = bifp; 2998 mc2->m_flags &= ~M_BRIDGE_INJECT; 2999 sc->sc_if_input(bifp, mc2); 3000 } 3001 3002 /* Return the original packet for local processing. */ 3003 return (m); 3004 } 3005 3006 if ((bif->bif_flags & IFBIF_STP) && 3007 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 3008 return (m); 3009 } 3010 3011 #if defined(INET) || defined(INET6) 3012 #define CARP_CHECK_WE_ARE_DST(iface) \ 3013 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 3014 #define CARP_CHECK_WE_ARE_SRC(iface) \ 3015 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 3016 #else 3017 #define CARP_CHECK_WE_ARE_DST(iface) false 3018 #define CARP_CHECK_WE_ARE_SRC(iface) false 3019 #endif 3020 3021 #ifdef DEV_NETMAP 3022 #define GRAB_FOR_NETMAP(ifp, m) do { \ 3023 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \ 3024 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \ 3025 (ifp)->if_input(ifp, m); \ 3026 return (NULL); \ 3027 } \ 3028 } while (0) 3029 #else 3030 #define GRAB_FOR_NETMAP(ifp, m) 3031 #endif 3032 3033 #define GRAB_OUR_PACKETS(iface) \ 3034 if ((iface)->if_type == IFT_GIF) \ 3035 continue; \ 3036 /* It is destined for us. */ \ 3037 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 3038 CARP_CHECK_WE_ARE_DST(iface)) { \ 3039 if (bif->bif_flags & IFBIF_LEARNING) { \ 3040 error = bridge_rtupdate(sc, eh->ether_shost, \ 3041 vlan, bif, 0, IFBAF_DYNAMIC); \ 3042 if (error && bif->bif_addrmax) { \ 3043 m_freem(m); \ 3044 return (NULL); \ 3045 } \ 3046 } \ 3047 m->m_pkthdr.rcvif = iface; \ 3048 if ((iface) == ifp) { \ 3049 /* Skip bridge processing... src == dest */ \ 3050 return (m); \ 3051 } \ 3052 /* It's passing over or to the bridge, locally. */ \ 3053 ETHER_BPF_MTAP(bifp, m); \ 3054 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 3055 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\ 3056 /* Hand the packet over to netmap if necessary. */ \ 3057 GRAB_FOR_NETMAP(bifp, m); \ 3058 /* Filter on the physical interface. */ \ 3059 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \ 3060 if (bridge_pfil(&m, NULL, ifp, \ 3061 PFIL_IN) != 0 || m == NULL) { \ 3062 return (NULL); \ 3063 } \ 3064 } \ 3065 if ((iface) != bifp) \ 3066 ETHER_BPF_MTAP(iface, m); \ 3067 /* Pass tagged packets to if_vlan, if it's loaded */ \ 3068 if (VLANTAGOF(m) != 0) { \ 3069 if (bifp->if_vlantrunk == NULL) { \ 3070 m_freem(m); \ 3071 return (NULL); \ 3072 } \ 3073 (*vlan_input_p)(bifp, m); \ 3074 return (NULL); \ 3075 } \ 3076 return (m); \ 3077 } \ 3078 \ 3079 /* We just received a packet that we sent out. */ \ 3080 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 3081 CARP_CHECK_WE_ARE_SRC(iface)) { \ 3082 m_freem(m); \ 3083 return (NULL); \ 3084 } 3085 3086 /* 3087 * Unicast. Make sure it's not for the bridge. 3088 */ 3089 do { GRAB_OUR_PACKETS(bifp) } while (0); 3090 3091 /* 3092 * If member_ifaddrs is enabled, see if the packet is destined for 3093 * one of the members' addresses. 3094 */ 3095 if (V_member_ifaddrs) { 3096 /* Check the interface the packet arrived on. */ 3097 do { GRAB_OUR_PACKETS(ifp) } while (0); 3098 3099 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 3100 GRAB_OUR_PACKETS(bif2->bif_ifp) 3101 } 3102 } 3103 3104 #undef CARP_CHECK_WE_ARE_DST 3105 #undef CARP_CHECK_WE_ARE_SRC 3106 #undef GRAB_FOR_NETMAP 3107 #undef GRAB_OUR_PACKETS 3108 3109 /* Perform the bridge forwarding function. */ 3110 bridge_forward(sc, bif, m); 3111 3112 return (NULL); 3113 } 3114 3115 /* 3116 * Inject a packet back into the host ethernet stack. This will generally only 3117 * be used by netmap when an application writes to the host TX ring. The 3118 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge 3119 * interface after ethernet processing. 3120 */ 3121 static void 3122 bridge_inject(struct ifnet *ifp, struct mbuf *m) 3123 { 3124 struct bridge_softc *sc; 3125 3126 if (ifp->if_type == IFT_L2VLAN) { 3127 /* 3128 * vlan(4) gives us the vlan ifnet, so we need to get the 3129 * bridge softc to get a pointer to ether_input to send the 3130 * packet to. 3131 */ 3132 struct ifnet *bifp = NULL; 3133 3134 if (vlan_trunkdev_p == NULL) { 3135 m_freem(m); 3136 return; 3137 } 3138 3139 bifp = vlan_trunkdev_p(ifp); 3140 if (bifp == NULL) { 3141 m_freem(m); 3142 return; 3143 } 3144 3145 sc = if_getsoftc(bifp); 3146 sc->sc_if_input(ifp, m); 3147 return; 3148 } 3149 3150 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0, 3151 ("%s: iface %s is not running in netmap mode", 3152 __func__, if_name(ifp))); 3153 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0, 3154 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m)); 3155 3156 m->m_flags |= M_BRIDGE_INJECT; 3157 sc = if_getsoftc(ifp); 3158 sc->sc_if_input(ifp, m); 3159 } 3160 3161 /* 3162 * bridge_broadcast: 3163 * 3164 * Send a frame to all interfaces that are members of 3165 * the bridge, except for the one on which the packet 3166 * arrived. 3167 * 3168 * NOTE: Releases the lock on return. 3169 */ 3170 static void 3171 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 3172 struct mbuf *m, int runfilt) 3173 { 3174 struct bridge_iflist *dbif, *sbif; 3175 struct mbuf *mc; 3176 struct ifnet *dst_if; 3177 int used = 0, i; 3178 3179 NET_EPOCH_ASSERT(); 3180 3181 sbif = bridge_lookup_member_if(sc, src_if); 3182 3183 /* Filter on the bridge interface before broadcasting */ 3184 if (runfilt && PFIL_HOOKED_OUT_46) { 3185 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 3186 return; 3187 if (m == NULL) 3188 return; 3189 } 3190 3191 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 3192 dst_if = dbif->bif_ifp; 3193 if (dst_if == src_if) 3194 continue; 3195 3196 /* Private segments can not talk to each other */ 3197 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 3198 continue; 3199 3200 if ((dbif->bif_flags & IFBIF_STP) && 3201 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 3202 continue; 3203 3204 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 3205 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 3206 continue; 3207 3208 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3209 continue; 3210 3211 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 3212 mc = m; 3213 used = 1; 3214 } else { 3215 mc = m_dup(m, M_NOWAIT); 3216 if (mc == NULL) { 3217 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3218 continue; 3219 } 3220 } 3221 3222 /* 3223 * Filter on the output interface. Pass a NULL bridge interface 3224 * pointer so we do not redundantly filter on the bridge for 3225 * each interface we broadcast on. 3226 */ 3227 if (runfilt && PFIL_HOOKED_OUT_46) { 3228 if (used == 0) { 3229 /* Keep the layer3 header aligned */ 3230 i = min(mc->m_pkthdr.len, max_protohdr); 3231 mc = m_copyup(mc, i, ETHER_ALIGN); 3232 if (mc == NULL) { 3233 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3234 continue; 3235 } 3236 } 3237 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 3238 continue; 3239 if (mc == NULL) 3240 continue; 3241 } 3242 3243 bridge_enqueue(sc, dst_if, mc, dbif); 3244 } 3245 if (used == 0) 3246 m_freem(m); 3247 } 3248 3249 /* 3250 * bridge_span: 3251 * 3252 * Duplicate a packet out one or more interfaces that are in span mode, 3253 * the original mbuf is unmodified. 3254 */ 3255 static void 3256 bridge_span(struct bridge_softc *sc, struct mbuf *m) 3257 { 3258 struct bridge_iflist *bif; 3259 struct ifnet *dst_if; 3260 struct mbuf *mc; 3261 3262 NET_EPOCH_ASSERT(); 3263 3264 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 3265 return; 3266 3267 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 3268 dst_if = bif->bif_ifp; 3269 3270 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 3271 continue; 3272 3273 mc = m_dup(m, M_NOWAIT); 3274 if (mc == NULL) { 3275 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 3276 continue; 3277 } 3278 3279 bridge_enqueue(sc, dst_if, mc, bif); 3280 } 3281 } 3282 3283 /* 3284 * Incoming VLAN filtering. Given a frame and the member interface it was 3285 * received on, decide whether the port configuration allows it. 3286 */ 3287 static bool 3288 bridge_vfilter_in(const struct bridge_iflist *sbif, struct mbuf *m) 3289 { 3290 ether_vlanid_t vlan; 3291 3292 vlan = VLANTAGOF(m); 3293 /* Make sure the vlan id is reasonable. */ 3294 if (vlan > DOT1Q_VID_MAX) 3295 return (false); 3296 3297 /* 3298 * If VLAN filtering isn't enabled, pass everything, but add a tag 3299 * if the port has a pvid configured. 3300 */ 3301 if ((sbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) { 3302 if (vlan == DOT1Q_VID_NULL && 3303 sbif->bif_pvid != DOT1Q_VID_NULL) { 3304 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3305 m->m_flags |= M_VLANTAG; 3306 } 3307 3308 return (true); 3309 } 3310 3311 /* If Q-in-Q is disabled, check for stacked tags. */ 3312 if ((sbif->bif_flags & IFBIF_QINQ) == 0) { 3313 struct ether_header *eh; 3314 uint16_t proto; 3315 3316 eh = mtod(m, struct ether_header *); 3317 proto = ntohs(eh->ether_type); 3318 3319 if (proto == ETHERTYPE_VLAN || proto == ETHERTYPE_QINQ) 3320 return (false); 3321 } 3322 3323 if (vlan == DOT1Q_VID_NULL) { 3324 /* 3325 * The frame doesn't have a tag. If the interface does not 3326 * have an untagged vlan configured, drop the frame. 3327 */ 3328 if (sbif->bif_pvid == DOT1Q_VID_NULL) 3329 return (false); 3330 3331 /* 3332 * Otherwise, insert a new tag based on the interface's 3333 * untagged vlan id. 3334 */ 3335 m->m_pkthdr.ether_vtag = sbif->bif_pvid; 3336 m->m_flags |= M_VLANTAG; 3337 } else { 3338 /* 3339 * The frame has a tag, so check it matches the interface's 3340 * vlan access list. We explicitly do not accept tagged 3341 * frames for the untagged vlan id here (unless it's also 3342 * in the access list). 3343 */ 3344 if (!BRVLAN_TEST(&sbif->bif_vlan_set, vlan)) 3345 return (false); 3346 } 3347 3348 /* Accept the frame. */ 3349 return (true); 3350 } 3351 3352 /* 3353 * Outgoing VLAN filtering. Given a frame, its vlan, and the member interface 3354 * we intend to send it to, decide whether the port configuration allows it to 3355 * be sent. 3356 */ 3357 static bool 3358 bridge_vfilter_out(const struct bridge_iflist *dbif, const struct mbuf *m) 3359 { 3360 struct ether_header *eh; 3361 ether_vlanid_t vlan; 3362 3363 NET_EPOCH_ASSERT(); 3364 3365 /* 3366 * If the interface is in span mode, then bif_sc will be NULL. 3367 * Since the purpose of span interfaces is to receive all frames, 3368 * pass everything. 3369 */ 3370 if (dbif->bif_sc == NULL) 3371 return (true); 3372 3373 /* If VLAN filtering isn't enabled, pass everything. */ 3374 if ((dbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) 3375 return (true); 3376 3377 vlan = VLANTAGOF(m); 3378 3379 /* 3380 * Always allow untagged 802.1D STP frames, even if they would 3381 * otherwise be dropped. This is required for STP to work on 3382 * a filtering bridge. 3383 * 3384 * Tagged STP (Cisco PVST+) is a non-standard extension, so 3385 * handle those frames via the normal filtering path. 3386 */ 3387 eh = mtod(m, struct ether_header *); 3388 if (vlan == DOT1Q_VID_NULL && 3389 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) 3390 return (true); 3391 3392 /* 3393 * If the frame wasn't assigned to a vlan at ingress, drop it. 3394 * We can't forward these frames to filtering ports because we 3395 * don't know what VLAN they're supposed to be in. 3396 */ 3397 if (vlan == DOT1Q_VID_NULL) 3398 return (false); 3399 3400 /* 3401 * If the frame's vlan matches the interfaces's untagged vlan, 3402 * allow it. 3403 */ 3404 if (vlan == dbif->bif_pvid) 3405 return (true); 3406 3407 /* 3408 * If the frame's vlan is on the interface's tagged access list, 3409 * allow it. 3410 */ 3411 if (BRVLAN_TEST(&dbif->bif_vlan_set, vlan)) 3412 return (true); 3413 3414 /* The frame was not permitted, so drop it. */ 3415 return (false); 3416 } 3417 3418 /* 3419 * bridge_rtupdate: 3420 * 3421 * Add a bridge routing entry. 3422 */ 3423 static int 3424 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 3425 ether_vlanid_t vlan, struct bridge_iflist *bif, 3426 int setflags, uint8_t flags) 3427 { 3428 struct bridge_rtnode *brt; 3429 struct bridge_iflist *obif; 3430 int error; 3431 3432 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3433 3434 /* Check the source address is valid and not multicast. */ 3435 if (ETHER_IS_MULTICAST(dst)) 3436 return (EXTERROR(EINVAL, "Multicast address not permitted")); 3437 if (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 3438 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) 3439 return (EXTERROR(EINVAL, "Zero address not permitted")); 3440 3441 /* 3442 * A route for this destination might already exist. If so, 3443 * update it, otherwise create a new one. 3444 */ 3445 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 3446 BRIDGE_RT_LOCK(sc); 3447 3448 /* Check again, now that we have the lock. There could have 3449 * been a race and we only want to insert this once. */ 3450 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) { 3451 BRIDGE_RT_UNLOCK(sc); 3452 return (0); 3453 } 3454 3455 if (sc->sc_brtcnt >= sc->sc_brtmax) { 3456 sc->sc_brtexceeded++; 3457 BRIDGE_RT_UNLOCK(sc); 3458 return (EXTERROR(ENOSPC, "Address table is full")); 3459 } 3460 /* Check per interface address limits (if enabled) */ 3461 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 3462 bif->bif_addrexceeded++; 3463 BRIDGE_RT_UNLOCK(sc); 3464 return (EXTERROR(ENOSPC, 3465 "Interface address limit exceeded")); 3466 } 3467 3468 /* 3469 * Allocate a new bridge forwarding node, and 3470 * initialize the expiration time and Ethernet 3471 * address. 3472 */ 3473 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 3474 if (brt == NULL) { 3475 BRIDGE_RT_UNLOCK(sc); 3476 return (EXTERROR(ENOMEM, 3477 "Cannot allocate address node")); 3478 } 3479 brt->brt_vnet = curvnet; 3480 3481 if (bif->bif_flags & IFBIF_STICKY) 3482 brt->brt_flags = IFBAF_STICKY; 3483 else 3484 brt->brt_flags = IFBAF_DYNAMIC; 3485 3486 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 3487 brt->brt_vlan = vlan; 3488 3489 brt->brt_dst = bif; 3490 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 3491 uma_zfree(V_bridge_rtnode_zone, brt); 3492 BRIDGE_RT_UNLOCK(sc); 3493 return (error); 3494 } 3495 bif->bif_addrcnt++; 3496 3497 BRIDGE_RT_UNLOCK(sc); 3498 } 3499 3500 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 3501 (obif = brt->brt_dst) != bif) { 3502 MPASS(obif != NULL); 3503 3504 BRIDGE_RT_LOCK(sc); 3505 brt->brt_dst->bif_addrcnt--; 3506 brt->brt_dst = bif; 3507 brt->brt_dst->bif_addrcnt++; 3508 BRIDGE_RT_UNLOCK(sc); 3509 3510 if (V_log_mac_flap && 3511 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) { 3512 log(LOG_NOTICE, 3513 "%s: mac address %6D vlan %d moved from %s to %s\n", 3514 sc->sc_ifp->if_xname, 3515 &brt->brt_addr[0], ":", 3516 brt->brt_vlan, 3517 obif->bif_ifp->if_xname, 3518 bif->bif_ifp->if_xname); 3519 } 3520 } 3521 3522 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3523 brt->brt_expire = time_uptime + sc->sc_brttimeout; 3524 if (setflags) 3525 brt->brt_flags = flags; 3526 3527 return (0); 3528 } 3529 3530 /* 3531 * bridge_rtlookup: 3532 * 3533 * Lookup the destination interface for an address. 3534 */ 3535 static struct ifnet * 3536 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, 3537 ether_vlanid_t vlan) 3538 { 3539 struct bridge_rtnode *brt; 3540 3541 NET_EPOCH_ASSERT(); 3542 3543 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 3544 return (NULL); 3545 3546 return (brt->brt_ifp); 3547 } 3548 3549 /* 3550 * bridge_rttrim: 3551 * 3552 * Trim the routine table so that we have a number 3553 * of routing entries less than or equal to the 3554 * maximum number. 3555 */ 3556 static void 3557 bridge_rttrim(struct bridge_softc *sc) 3558 { 3559 struct bridge_rtnode *brt, *nbrt; 3560 3561 NET_EPOCH_ASSERT(); 3562 BRIDGE_RT_LOCK_ASSERT(sc); 3563 3564 /* Make sure we actually need to do this. */ 3565 if (sc->sc_brtcnt <= sc->sc_brtmax) 3566 return; 3567 3568 /* Force an aging cycle; this might trim enough addresses. */ 3569 bridge_rtage(sc); 3570 if (sc->sc_brtcnt <= sc->sc_brtmax) 3571 return; 3572 3573 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3574 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3575 bridge_rtnode_destroy(sc, brt); 3576 if (sc->sc_brtcnt <= sc->sc_brtmax) 3577 return; 3578 } 3579 } 3580 } 3581 3582 /* 3583 * bridge_timer: 3584 * 3585 * Aging timer for the bridge. 3586 */ 3587 static void 3588 bridge_timer(void *arg) 3589 { 3590 struct bridge_softc *sc = arg; 3591 3592 BRIDGE_RT_LOCK_ASSERT(sc); 3593 3594 /* Destruction of rtnodes requires a proper vnet context */ 3595 CURVNET_SET(sc->sc_ifp->if_vnet); 3596 bridge_rtage(sc); 3597 3598 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 3599 callout_reset(&sc->sc_brcallout, 3600 bridge_rtable_prune_period * hz, bridge_timer, sc); 3601 CURVNET_RESTORE(); 3602 } 3603 3604 /* 3605 * bridge_rtage: 3606 * 3607 * Perform an aging cycle. 3608 */ 3609 static void 3610 bridge_rtage(struct bridge_softc *sc) 3611 { 3612 struct bridge_rtnode *brt, *nbrt; 3613 3614 BRIDGE_RT_LOCK_ASSERT(sc); 3615 3616 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3617 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 3618 if (time_uptime >= brt->brt_expire) 3619 bridge_rtnode_destroy(sc, brt); 3620 } 3621 } 3622 } 3623 3624 /* 3625 * bridge_rtflush: 3626 * 3627 * Remove all dynamic addresses from the bridge. 3628 */ 3629 static void 3630 bridge_rtflush(struct bridge_softc *sc, int full) 3631 { 3632 struct bridge_rtnode *brt, *nbrt; 3633 3634 BRIDGE_RT_LOCK_ASSERT(sc); 3635 3636 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3637 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3638 bridge_rtnode_destroy(sc, brt); 3639 } 3640 } 3641 3642 /* 3643 * bridge_rtdaddr: 3644 * 3645 * Remove an address from the table. 3646 */ 3647 static int 3648 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, 3649 ether_vlanid_t vlan) 3650 { 3651 struct bridge_rtnode *brt; 3652 int found = 0; 3653 3654 BRIDGE_RT_LOCK(sc); 3655 3656 /* 3657 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans 3658 * so the lookup may return more than one. 3659 */ 3660 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 3661 bridge_rtnode_destroy(sc, brt); 3662 found = 1; 3663 } 3664 3665 BRIDGE_RT_UNLOCK(sc); 3666 3667 return (found ? 0 : ENOENT); 3668 } 3669 3670 /* 3671 * bridge_rtdelete: 3672 * 3673 * Delete routes to a speicifc member interface. 3674 */ 3675 static void 3676 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3677 { 3678 struct bridge_rtnode *brt, *nbrt; 3679 3680 BRIDGE_RT_LOCK_ASSERT(sc); 3681 3682 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3683 if (brt->brt_ifp == ifp && (full || 3684 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3685 bridge_rtnode_destroy(sc, brt); 3686 } 3687 } 3688 3689 /* 3690 * bridge_rtable_init: 3691 * 3692 * Initialize the route table for this bridge. 3693 */ 3694 static void 3695 bridge_rtable_init(struct bridge_softc *sc) 3696 { 3697 int i; 3698 3699 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3700 M_DEVBUF, M_WAITOK); 3701 3702 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3703 CK_LIST_INIT(&sc->sc_rthash[i]); 3704 3705 sc->sc_rthash_key = arc4random(); 3706 CK_LIST_INIT(&sc->sc_rtlist); 3707 } 3708 3709 /* 3710 * bridge_rtable_fini: 3711 * 3712 * Deconstruct the route table for this bridge. 3713 */ 3714 static void 3715 bridge_rtable_fini(struct bridge_softc *sc) 3716 { 3717 3718 KASSERT(sc->sc_brtcnt == 0, 3719 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3720 free(sc->sc_rthash, M_DEVBUF); 3721 } 3722 3723 /* 3724 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3725 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3726 */ 3727 #define mix(a, b, c) \ 3728 do { \ 3729 a -= b; a -= c; a ^= (c >> 13); \ 3730 b -= c; b -= a; b ^= (a << 8); \ 3731 c -= a; c -= b; c ^= (b >> 13); \ 3732 a -= b; a -= c; a ^= (c >> 12); \ 3733 b -= c; b -= a; b ^= (a << 16); \ 3734 c -= a; c -= b; c ^= (b >> 5); \ 3735 a -= b; a -= c; a ^= (c >> 3); \ 3736 b -= c; b -= a; b ^= (a << 10); \ 3737 c -= a; c -= b; c ^= (b >> 15); \ 3738 } while (/*CONSTCOND*/0) 3739 3740 static __inline uint32_t 3741 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3742 { 3743 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3744 3745 b += addr[5] << 8; 3746 b += addr[4]; 3747 a += addr[3] << 24; 3748 a += addr[2] << 16; 3749 a += addr[1] << 8; 3750 a += addr[0]; 3751 3752 mix(a, b, c); 3753 3754 return (c & BRIDGE_RTHASH_MASK); 3755 } 3756 3757 #undef mix 3758 3759 static int 3760 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3761 { 3762 int i, d; 3763 3764 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3765 d = ((int)a[i]) - ((int)b[i]); 3766 } 3767 3768 return (d); 3769 } 3770 3771 /* 3772 * bridge_rtnode_lookup: 3773 * 3774 * Look up a bridge route node for the specified destination. Compare the 3775 * vlan id or if zero then just return the first match. 3776 */ 3777 static struct bridge_rtnode * 3778 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, 3779 ether_vlanid_t vlan) 3780 { 3781 struct bridge_rtnode *brt; 3782 uint32_t hash; 3783 int dir; 3784 3785 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3786 3787 hash = bridge_rthash(sc, addr); 3788 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3789 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3790 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL)) 3791 return (brt); 3792 if (dir > 0) 3793 return (NULL); 3794 } 3795 3796 return (NULL); 3797 } 3798 3799 /* 3800 * bridge_rtnode_insert: 3801 * 3802 * Insert the specified bridge node into the route table. We 3803 * assume the entry is not already in the table. 3804 */ 3805 static int 3806 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3807 { 3808 struct bridge_rtnode *lbrt; 3809 uint32_t hash; 3810 int dir; 3811 3812 BRIDGE_RT_LOCK_ASSERT(sc); 3813 3814 hash = bridge_rthash(sc, brt->brt_addr); 3815 3816 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3817 if (lbrt == NULL) { 3818 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3819 goto out; 3820 } 3821 3822 do { 3823 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3824 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3825 return (EXTERROR(EEXIST, "Address already exists")); 3826 if (dir > 0) { 3827 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3828 goto out; 3829 } 3830 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3831 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3832 goto out; 3833 } 3834 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3835 } while (lbrt != NULL); 3836 3837 #ifdef DIAGNOSTIC 3838 panic("bridge_rtnode_insert: impossible"); 3839 #endif 3840 3841 out: 3842 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3843 sc->sc_brtcnt++; 3844 3845 return (0); 3846 } 3847 3848 static void 3849 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3850 { 3851 struct bridge_rtnode *brt; 3852 3853 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3854 3855 CURVNET_SET(brt->brt_vnet); 3856 uma_zfree(V_bridge_rtnode_zone, brt); 3857 CURVNET_RESTORE(); 3858 } 3859 3860 /* 3861 * bridge_rtnode_destroy: 3862 * 3863 * Destroy a bridge rtnode. 3864 */ 3865 static void 3866 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3867 { 3868 BRIDGE_RT_LOCK_ASSERT(sc); 3869 3870 CK_LIST_REMOVE(brt, brt_hash); 3871 3872 CK_LIST_REMOVE(brt, brt_list); 3873 sc->sc_brtcnt--; 3874 brt->brt_dst->bif_addrcnt--; 3875 3876 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3877 } 3878 3879 /* 3880 * bridge_rtable_expire: 3881 * 3882 * Set the expiry time for all routes on an interface. 3883 */ 3884 static void 3885 bridge_rtable_expire(struct ifnet *ifp, int age) 3886 { 3887 struct bridge_iflist *bif = NULL; 3888 struct bridge_softc *sc = NULL; 3889 struct bridge_rtnode *brt; 3890 3891 CURVNET_SET(ifp->if_vnet); 3892 3893 bif = ifp->if_bridge; 3894 if (bif) 3895 sc = bif->bif_sc; 3896 MPASS(sc != NULL); 3897 BRIDGE_RT_LOCK(sc); 3898 3899 /* 3900 * If the age is zero then flush, otherwise set all the expiry times to 3901 * age for the interface 3902 */ 3903 if (age == 0) 3904 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3905 else { 3906 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3907 /* Cap the expiry time to 'age' */ 3908 if (brt->brt_ifp == ifp && 3909 brt->brt_expire > time_uptime + age && 3910 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3911 brt->brt_expire = time_uptime + age; 3912 } 3913 } 3914 BRIDGE_RT_UNLOCK(sc); 3915 CURVNET_RESTORE(); 3916 } 3917 3918 /* 3919 * bridge_state_change: 3920 * 3921 * Callback from the bridgestp code when a port changes states. 3922 */ 3923 static void 3924 bridge_state_change(struct ifnet *ifp, int state) 3925 { 3926 struct bridge_iflist *bif = ifp->if_bridge; 3927 struct bridge_softc *sc = bif->bif_sc; 3928 static const char *stpstates[] = { 3929 "disabled", 3930 "listening", 3931 "learning", 3932 "forwarding", 3933 "blocking", 3934 "discarding" 3935 }; 3936 3937 CURVNET_SET(ifp->if_vnet); 3938 if (V_log_stp) 3939 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3940 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3941 CURVNET_RESTORE(); 3942 } 3943 3944 /* 3945 * Send bridge packets through pfil if they are one of the types pfil can deal 3946 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3947 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3948 * that interface. 3949 */ 3950 static int 3951 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3952 { 3953 int snap, error, i; 3954 struct ether_header *eh1, eh2; 3955 struct llc llc1; 3956 u_int16_t ether_type; 3957 pfil_return_t rv; 3958 #ifdef INET 3959 struct ip *ip = NULL; 3960 int hlen = 0; 3961 #endif 3962 3963 snap = 0; 3964 error = -1; /* Default error if not error == 0 */ 3965 3966 #if 0 3967 /* we may return with the IP fields swapped, ensure its not shared */ 3968 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3969 #endif 3970 3971 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3972 return (0); /* filtering is disabled */ 3973 3974 i = min((*mp)->m_pkthdr.len, max_protohdr); 3975 if ((*mp)->m_len < i) { 3976 *mp = m_pullup(*mp, i); 3977 if (*mp == NULL) { 3978 printf("%s: m_pullup failed\n", __func__); 3979 return (-1); 3980 } 3981 } 3982 3983 eh1 = mtod(*mp, struct ether_header *); 3984 ether_type = ntohs(eh1->ether_type); 3985 3986 /* 3987 * Check for SNAP/LLC. 3988 */ 3989 if (ether_type < ETHERMTU) { 3990 struct llc *llc2 = (struct llc *)(eh1 + 1); 3991 3992 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3993 llc2->llc_dsap == LLC_SNAP_LSAP && 3994 llc2->llc_ssap == LLC_SNAP_LSAP && 3995 llc2->llc_control == LLC_UI) { 3996 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3997 snap = 1; 3998 } 3999 } 4000 4001 /* 4002 * If we're trying to filter bridge traffic, only look at traffic for 4003 * protocols available in the kernel (IPv4 and/or IPv6) to avoid 4004 * passing traffic for an unsupported protocol to the filter. This is 4005 * lame since if we really wanted, say, an AppleTalk filter, we are 4006 * hosed, but of course we don't have an AppleTalk filter to begin 4007 * with. (Note that since pfil doesn't understand ARP it will pass 4008 * *ALL* ARP traffic.) 4009 */ 4010 switch (ether_type) { 4011 #ifdef INET 4012 case ETHERTYPE_ARP: 4013 case ETHERTYPE_REVARP: 4014 if (V_pfil_ipfw_arp == 0) 4015 return (0); /* Automatically pass */ 4016 4017 /* FALLTHROUGH */ 4018 case ETHERTYPE_IP: 4019 #endif 4020 #ifdef INET6 4021 case ETHERTYPE_IPV6: 4022 #endif /* INET6 */ 4023 break; 4024 4025 default: 4026 /* 4027 * We get here if the packet isn't from a supported 4028 * protocol. Check to see if the user wants to pass 4029 * non-IP packets, these will not be checked by pfil(9) 4030 * and passed unconditionally so the default is to 4031 * drop. 4032 */ 4033 if (V_pfil_onlyip) 4034 goto bad; 4035 } 4036 4037 /* Run the packet through pfil before stripping link headers */ 4038 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 4039 dir == PFIL_OUT && ifp != NULL) { 4040 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 4041 case PFIL_DROPPED: 4042 return (EACCES); 4043 case PFIL_CONSUMED: 4044 return (0); 4045 } 4046 } 4047 4048 /* Strip off the Ethernet header and keep a copy. */ 4049 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 4050 m_adj(*mp, ETHER_HDR_LEN); 4051 4052 /* Strip off snap header, if present */ 4053 if (snap) { 4054 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 4055 m_adj(*mp, sizeof(struct llc)); 4056 } 4057 4058 /* 4059 * Check the IP header for alignment and errors 4060 */ 4061 if (dir == PFIL_IN) { 4062 switch (ether_type) { 4063 #ifdef INET 4064 case ETHERTYPE_IP: 4065 error = bridge_ip_checkbasic(mp); 4066 break; 4067 #endif 4068 #ifdef INET6 4069 case ETHERTYPE_IPV6: 4070 error = bridge_ip6_checkbasic(mp); 4071 break; 4072 #endif /* INET6 */ 4073 default: 4074 error = 0; 4075 } 4076 if (error) 4077 goto bad; 4078 } 4079 4080 error = 0; 4081 4082 /* 4083 * Run the packet through pfil 4084 */ 4085 rv = PFIL_PASS; 4086 switch (ether_type) { 4087 #ifdef INET 4088 case ETHERTYPE_IP: 4089 /* 4090 * Run pfil on the member interface and the bridge, both can 4091 * be skipped by clearing pfil_member or pfil_bridge. 4092 * 4093 * Keep the order: 4094 * in_if -> bridge_if -> out_if 4095 */ 4096 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4097 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 4098 PFIL_PASS) 4099 break; 4100 4101 if (V_pfil_member && ifp != NULL) { 4102 rv = (dir == PFIL_OUT) ? 4103 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 4104 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 4105 if (rv != PFIL_PASS) 4106 break; 4107 } 4108 4109 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4110 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 4111 PFIL_PASS) 4112 break; 4113 4114 /* check if we need to fragment the packet */ 4115 /* bridge_fragment generates a mbuf chain of packets */ 4116 /* that already include eth headers */ 4117 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 4118 i = (*mp)->m_pkthdr.len; 4119 if (i > ifp->if_mtu) { 4120 error = bridge_fragment(ifp, mp, &eh2, snap, 4121 &llc1); 4122 return (error); 4123 } 4124 } 4125 4126 /* Recalculate the ip checksum. */ 4127 ip = mtod(*mp, struct ip *); 4128 hlen = ip->ip_hl << 2; 4129 if (hlen < sizeof(struct ip)) 4130 goto bad; 4131 if (hlen > (*mp)->m_len) { 4132 if ((*mp = m_pullup(*mp, hlen)) == NULL) 4133 goto bad; 4134 ip = mtod(*mp, struct ip *); 4135 if (ip == NULL) 4136 goto bad; 4137 } 4138 ip->ip_sum = 0; 4139 if (hlen == sizeof(struct ip)) 4140 ip->ip_sum = in_cksum_hdr(ip); 4141 else 4142 ip->ip_sum = in_cksum(*mp, hlen); 4143 4144 break; 4145 #endif /* INET */ 4146 #ifdef INET6 4147 case ETHERTYPE_IPV6: 4148 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 4149 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 4150 PFIL_PASS) 4151 break; 4152 4153 if (V_pfil_member && ifp != NULL) { 4154 rv = (dir == PFIL_OUT) ? 4155 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 4156 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 4157 if (rv != PFIL_PASS) 4158 break; 4159 } 4160 4161 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 4162 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 4163 PFIL_PASS) 4164 break; 4165 break; 4166 #endif 4167 } 4168 4169 switch (rv) { 4170 case PFIL_CONSUMED: 4171 return (0); 4172 case PFIL_DROPPED: 4173 return (EACCES); 4174 default: 4175 break; 4176 } 4177 4178 error = -1; 4179 4180 /* 4181 * Finally, put everything back the way it was and return 4182 */ 4183 if (snap) { 4184 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 4185 if (*mp == NULL) 4186 return (error); 4187 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 4188 } 4189 4190 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 4191 if (*mp == NULL) 4192 return (error); 4193 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 4194 4195 return (0); 4196 4197 bad: 4198 m_freem(*mp); 4199 *mp = NULL; 4200 return (error); 4201 } 4202 4203 #ifdef INET 4204 /* 4205 * Perform basic checks on header size since 4206 * pfil assumes ip_input has already processed 4207 * it for it. Cut-and-pasted from ip_input.c. 4208 * Given how simple the IPv6 version is, 4209 * does the IPv4 version really need to be 4210 * this complicated? 4211 * 4212 * XXX Should we update ipstat here, or not? 4213 * XXX Right now we update ipstat but not 4214 * XXX csum_counter. 4215 */ 4216 static int 4217 bridge_ip_checkbasic(struct mbuf **mp) 4218 { 4219 struct mbuf *m = *mp; 4220 struct ip *ip; 4221 int len, hlen; 4222 u_short sum; 4223 4224 if (*mp == NULL) 4225 return (-1); 4226 4227 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4228 if ((m = m_copyup(m, sizeof(struct ip), 4229 (max_linkhdr + 3) & ~3)) == NULL) { 4230 /* XXXJRT new stat, please */ 4231 KMOD_IPSTAT_INC(ips_toosmall); 4232 goto bad; 4233 } 4234 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 4235 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 4236 KMOD_IPSTAT_INC(ips_toosmall); 4237 goto bad; 4238 } 4239 } 4240 ip = mtod(m, struct ip *); 4241 if (ip == NULL) goto bad; 4242 4243 if (ip->ip_v != IPVERSION) { 4244 KMOD_IPSTAT_INC(ips_badvers); 4245 goto bad; 4246 } 4247 hlen = ip->ip_hl << 2; 4248 if (hlen < sizeof(struct ip)) { /* minimum header length */ 4249 KMOD_IPSTAT_INC(ips_badhlen); 4250 goto bad; 4251 } 4252 if (hlen > m->m_len) { 4253 if ((m = m_pullup(m, hlen)) == NULL) { 4254 KMOD_IPSTAT_INC(ips_badhlen); 4255 goto bad; 4256 } 4257 ip = mtod(m, struct ip *); 4258 if (ip == NULL) goto bad; 4259 } 4260 4261 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 4262 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 4263 } else { 4264 if (hlen == sizeof(struct ip)) { 4265 sum = in_cksum_hdr(ip); 4266 } else { 4267 sum = in_cksum(m, hlen); 4268 } 4269 } 4270 if (sum) { 4271 KMOD_IPSTAT_INC(ips_badsum); 4272 goto bad; 4273 } 4274 4275 /* Retrieve the packet length. */ 4276 len = ntohs(ip->ip_len); 4277 4278 /* 4279 * Check for additional length bogosity 4280 */ 4281 if (len < hlen) { 4282 KMOD_IPSTAT_INC(ips_badlen); 4283 goto bad; 4284 } 4285 4286 /* 4287 * Check that the amount of data in the buffers 4288 * is as at least much as the IP header would have us expect. 4289 * Drop packet if shorter than we expect. 4290 */ 4291 if (m->m_pkthdr.len < len) { 4292 KMOD_IPSTAT_INC(ips_tooshort); 4293 goto bad; 4294 } 4295 4296 /* Checks out, proceed */ 4297 *mp = m; 4298 return (0); 4299 4300 bad: 4301 *mp = m; 4302 return (-1); 4303 } 4304 #endif /* INET */ 4305 4306 #ifdef INET6 4307 /* 4308 * Same as above, but for IPv6. 4309 * Cut-and-pasted from ip6_input.c. 4310 * XXX Should we update ip6stat, or not? 4311 */ 4312 static int 4313 bridge_ip6_checkbasic(struct mbuf **mp) 4314 { 4315 struct mbuf *m = *mp; 4316 struct ip6_hdr *ip6; 4317 4318 /* 4319 * If the IPv6 header is not aligned, slurp it up into a new 4320 * mbuf with space for link headers, in the event we forward 4321 * it. Otherwise, if it is aligned, make sure the entire base 4322 * IPv6 header is in the first mbuf of the chain. 4323 */ 4324 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 4325 struct ifnet *inifp = m->m_pkthdr.rcvif; 4326 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 4327 (max_linkhdr + 3) & ~3)) == NULL) { 4328 /* XXXJRT new stat, please */ 4329 IP6STAT_INC(ip6s_toosmall); 4330 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4331 goto bad; 4332 } 4333 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 4334 struct ifnet *inifp = m->m_pkthdr.rcvif; 4335 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 4336 IP6STAT_INC(ip6s_toosmall); 4337 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 4338 goto bad; 4339 } 4340 } 4341 4342 ip6 = mtod(m, struct ip6_hdr *); 4343 4344 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 4345 IP6STAT_INC(ip6s_badvers); 4346 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 4347 goto bad; 4348 } 4349 4350 /* Checks out, proceed */ 4351 *mp = m; 4352 return (0); 4353 4354 bad: 4355 *mp = m; 4356 return (-1); 4357 } 4358 #endif /* INET6 */ 4359 4360 #ifdef INET 4361 /* 4362 * bridge_fragment: 4363 * 4364 * Fragment mbuf chain in multiple packets and prepend ethernet header. 4365 */ 4366 static int 4367 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 4368 int snap, struct llc *llc) 4369 { 4370 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 4371 struct ip *ip; 4372 int error = -1; 4373 4374 if (m->m_len < sizeof(struct ip) && 4375 (m = m_pullup(m, sizeof(struct ip))) == NULL) 4376 goto dropit; 4377 ip = mtod(m, struct ip *); 4378 4379 m->m_pkthdr.csum_flags |= CSUM_IP; 4380 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 4381 if (error) 4382 goto dropit; 4383 4384 /* 4385 * Walk the chain and re-add the Ethernet header for 4386 * each mbuf packet. 4387 */ 4388 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 4389 nextpkt = mcur->m_nextpkt; 4390 mcur->m_nextpkt = NULL; 4391 if (snap) { 4392 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 4393 if (mcur == NULL) { 4394 error = ENOBUFS; 4395 if (mprev != NULL) 4396 mprev->m_nextpkt = nextpkt; 4397 goto dropit; 4398 } 4399 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 4400 } 4401 4402 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 4403 if (mcur == NULL) { 4404 error = ENOBUFS; 4405 if (mprev != NULL) 4406 mprev->m_nextpkt = nextpkt; 4407 goto dropit; 4408 } 4409 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 4410 4411 /* 4412 * The previous two M_PREPEND could have inserted one or two 4413 * mbufs in front so we have to update the previous packet's 4414 * m_nextpkt. 4415 */ 4416 mcur->m_nextpkt = nextpkt; 4417 if (mprev != NULL) 4418 mprev->m_nextpkt = mcur; 4419 else { 4420 /* The first mbuf in the original chain needs to be 4421 * updated. */ 4422 *mp = mcur; 4423 } 4424 mprev = mcur; 4425 } 4426 4427 KMOD_IPSTAT_INC(ips_fragmented); 4428 return (error); 4429 4430 dropit: 4431 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 4432 m = mcur->m_nextpkt; 4433 m_freem(mcur); 4434 } 4435 return (error); 4436 } 4437 #endif /* INET */ 4438 4439 static void 4440 bridge_linkstate(struct ifnet *ifp) 4441 { 4442 struct bridge_softc *sc = NULL; 4443 struct bridge_iflist *bif; 4444 struct epoch_tracker et; 4445 4446 NET_EPOCH_ENTER(et); 4447 4448 bif = ifp->if_bridge; 4449 if (bif) 4450 sc = bif->bif_sc; 4451 4452 if (sc != NULL) { 4453 bridge_linkcheck(sc); 4454 bstp_linkstate(&bif->bif_stp); 4455 } 4456 4457 NET_EPOCH_EXIT(et); 4458 } 4459 4460 static void 4461 bridge_linkcheck(struct bridge_softc *sc) 4462 { 4463 struct bridge_iflist *bif; 4464 int new_link, hasls; 4465 4466 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 4467 4468 new_link = LINK_STATE_DOWN; 4469 hasls = 0; 4470 /* Our link is considered up if at least one of our ports is active */ 4471 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 4472 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 4473 hasls++; 4474 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 4475 new_link = LINK_STATE_UP; 4476 break; 4477 } 4478 } 4479 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 4480 /* If no interfaces support link-state then we default to up */ 4481 new_link = LINK_STATE_UP; 4482 } 4483 if_link_state_change(sc->sc_ifp, new_link); 4484 } 4485