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