1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogeneous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 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/pfil.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/in6_ifattach.h> 123 #endif 124 #if defined(INET) || defined(INET6) 125 #include <netinet/ip_carp.h> 126 #endif 127 #include <machine/in_cksum.h> 128 #include <netinet/if_ether.h> 129 #include <net/bridgestp.h> 130 #include <net/if_bridgevar.h> 131 #include <net/if_llc.h> 132 #include <net/if_vlan_var.h> 133 134 #include <net/route.h> 135 136 /* 137 * Size of the route hash table. Must be a power of two. 138 */ 139 #ifndef BRIDGE_RTHASH_SIZE 140 #define BRIDGE_RTHASH_SIZE 1024 141 #endif 142 143 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 144 145 /* 146 * Default maximum number of addresses to cache. 147 */ 148 #ifndef BRIDGE_RTABLE_MAX 149 #define BRIDGE_RTABLE_MAX 2000 150 #endif 151 152 /* 153 * Timeout (in seconds) for entries learned dynamically. 154 */ 155 #ifndef BRIDGE_RTABLE_TIMEOUT 156 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 157 #endif 158 159 /* 160 * Number of seconds between walks of the route list. 161 */ 162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 163 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 164 #endif 165 166 /* 167 * List of capabilities to possibly mask on the member interface. 168 */ 169 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 170 IFCAP_TXCSUM_IPV6) 171 172 /* 173 * List of capabilities to strip 174 */ 175 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 176 177 /* 178 * Bridge interface list entry. 179 */ 180 struct bridge_iflist { 181 LIST_ENTRY(bridge_iflist) bif_next; 182 struct ifnet *bif_ifp; /* member if */ 183 struct bstp_port bif_stp; /* STP state */ 184 uint32_t bif_flags; /* member if flags */ 185 int bif_savedcaps; /* saved capabilities */ 186 uint32_t bif_addrmax; /* max # of addresses */ 187 uint32_t bif_addrcnt; /* cur. # of addresses */ 188 uint32_t bif_addrexceeded;/* # of address violations */ 189 }; 190 191 /* 192 * Bridge route node. 193 */ 194 struct bridge_rtnode { 195 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 196 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 197 struct bridge_iflist *brt_dst; /* destination if */ 198 unsigned long brt_expire; /* expiration time */ 199 uint8_t brt_flags; /* address flags */ 200 uint8_t brt_addr[ETHER_ADDR_LEN]; 201 uint16_t brt_vlan; /* vlan id */ 202 }; 203 #define brt_ifp brt_dst->bif_ifp 204 205 /* 206 * Software state for each bridge. 207 */ 208 struct bridge_softc { 209 struct ifnet *sc_ifp; /* make this an interface */ 210 LIST_ENTRY(bridge_softc) sc_list; 211 struct mtx sc_mtx; 212 struct cv sc_cv; 213 uint32_t sc_brtmax; /* max # of addresses */ 214 uint32_t sc_brtcnt; /* cur. # of addresses */ 215 uint32_t sc_brttimeout; /* rt timeout in seconds */ 216 struct callout sc_brcallout; /* bridge callout */ 217 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 218 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 219 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 220 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 221 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 222 uint32_t sc_rthash_key; /* key for hash */ 223 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 224 struct bstp_state sc_stp; /* STP state */ 225 uint32_t sc_brtexceeded; /* # of cache drops */ 226 struct ifnet *sc_ifaddr; /* member mac copied from */ 227 u_char sc_defaddr[6]; /* Default MAC address */ 228 }; 229 230 static VNET_DEFINE(struct mtx, bridge_list_mtx); 231 #define V_bridge_list_mtx VNET(bridge_list_mtx) 232 static eventhandler_tag bridge_detach_cookie; 233 234 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 235 236 uma_zone_t bridge_rtnode_zone; 237 238 static int bridge_clone_create(struct if_clone *, int, caddr_t); 239 static void bridge_clone_destroy(struct ifnet *); 240 241 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 242 static void bridge_mutecaps(struct bridge_softc *); 243 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 244 int); 245 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 246 static void bridge_init(void *); 247 static void bridge_dummynet(struct mbuf *, struct ifnet *); 248 static void bridge_stop(struct ifnet *, int); 249 static int bridge_transmit(struct ifnet *, struct mbuf *); 250 static void bridge_qflush(struct ifnet *); 251 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 252 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 253 struct rtentry *); 254 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 255 struct mbuf *); 256 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 257 258 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 259 struct mbuf *m); 260 261 static void bridge_timer(void *); 262 263 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 264 struct mbuf *, int); 265 static void bridge_span(struct bridge_softc *, struct mbuf *); 266 267 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 268 uint16_t, struct bridge_iflist *, int, uint8_t); 269 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 270 uint16_t); 271 static void bridge_rttrim(struct bridge_softc *); 272 static void bridge_rtage(struct bridge_softc *); 273 static void bridge_rtflush(struct bridge_softc *, int); 274 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 275 uint16_t); 276 277 static void bridge_rtable_init(struct bridge_softc *); 278 static void bridge_rtable_fini(struct bridge_softc *); 279 280 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 281 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 282 const uint8_t *, uint16_t); 283 static int bridge_rtnode_insert(struct bridge_softc *, 284 struct bridge_rtnode *); 285 static void bridge_rtnode_destroy(struct bridge_softc *, 286 struct bridge_rtnode *); 287 static void bridge_rtable_expire(struct ifnet *, int); 288 static void bridge_state_change(struct ifnet *, int); 289 290 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 291 const char *name); 292 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 293 struct ifnet *ifp); 294 static void bridge_delete_member(struct bridge_softc *, 295 struct bridge_iflist *, int); 296 static void bridge_delete_span(struct bridge_softc *, 297 struct bridge_iflist *); 298 299 static int bridge_ioctl_add(struct bridge_softc *, void *); 300 static int bridge_ioctl_del(struct bridge_softc *, void *); 301 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 302 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 303 static int bridge_ioctl_scache(struct bridge_softc *, void *); 304 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 305 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 306 static int bridge_ioctl_rts(struct bridge_softc *, void *); 307 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 308 static int bridge_ioctl_sto(struct bridge_softc *, void *); 309 static int bridge_ioctl_gto(struct bridge_softc *, void *); 310 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 311 static int bridge_ioctl_flush(struct bridge_softc *, void *); 312 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 313 static int bridge_ioctl_spri(struct bridge_softc *, void *); 314 static int bridge_ioctl_ght(struct bridge_softc *, void *); 315 static int bridge_ioctl_sht(struct bridge_softc *, void *); 316 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 317 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 318 static int bridge_ioctl_gma(struct bridge_softc *, void *); 319 static int bridge_ioctl_sma(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 321 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 322 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 323 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 324 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 325 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 326 static int bridge_ioctl_grte(struct bridge_softc *, void *); 327 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 328 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 329 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 330 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 331 int); 332 static int bridge_ip_checkbasic(struct mbuf **mp); 333 #ifdef INET6 334 static int bridge_ip6_checkbasic(struct mbuf **mp); 335 #endif /* INET6 */ 336 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 337 struct ether_header *, int, struct llc *); 338 static void bridge_linkstate(struct ifnet *ifp); 339 static void bridge_linkcheck(struct bridge_softc *sc); 340 341 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 342 343 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 344 #define VLANTAGOF(_m) \ 345 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 346 347 static struct bstp_cb_ops bridge_ops = { 348 .bcb_state = bridge_state_change, 349 .bcb_rtage = bridge_rtable_expire 350 }; 351 352 SYSCTL_DECL(_net_link); 353 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 354 355 /* only pass IP[46] packets when pfil is enabled */ 356 static VNET_DEFINE(int, pfil_onlyip) = 1; 357 #define V_pfil_onlyip VNET(pfil_onlyip) 358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 359 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 360 "Only pass IP packets when pfil is enabled"); 361 362 /* run pfil hooks on the bridge interface */ 363 static VNET_DEFINE(int, pfil_bridge) = 1; 364 #define V_pfil_bridge VNET(pfil_bridge) 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 366 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 367 "Packet filter on the bridge interface"); 368 369 /* layer2 filter with ipfw */ 370 static VNET_DEFINE(int, pfil_ipfw); 371 #define V_pfil_ipfw VNET(pfil_ipfw) 372 373 /* layer2 ARP filter with ipfw */ 374 static VNET_DEFINE(int, pfil_ipfw_arp); 375 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 376 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 377 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 378 "Filter ARP packets through IPFW layer2"); 379 380 /* run pfil hooks on the member interface */ 381 static VNET_DEFINE(int, pfil_member) = 1; 382 #define V_pfil_member VNET(pfil_member) 383 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 384 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 385 "Packet filter on the member interface"); 386 387 /* run pfil hooks on the physical interface for locally destined packets */ 388 static VNET_DEFINE(int, pfil_local_phys); 389 #define V_pfil_local_phys VNET(pfil_local_phys) 390 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 391 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 392 "Packet filter on the physical interface for locally destined packets"); 393 394 /* log STP state changes */ 395 static VNET_DEFINE(int, log_stp); 396 #define V_log_stp VNET(log_stp) 397 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 398 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 399 "Log STP state changes"); 400 401 /* share MAC with first bridge member */ 402 static VNET_DEFINE(int, bridge_inherit_mac); 403 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 404 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 405 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 406 "Inherit MAC address from the first bridge member"); 407 408 static VNET_DEFINE(int, allow_llz_overlap) = 0; 409 #define V_allow_llz_overlap VNET(allow_llz_overlap) 410 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 411 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 412 "Allow overlap of link-local scope " 413 "zones of a bridge interface and the member interfaces"); 414 415 struct bridge_control { 416 int (*bc_func)(struct bridge_softc *, void *); 417 int bc_argsize; 418 int bc_flags; 419 }; 420 421 #define BC_F_COPYIN 0x01 /* copy arguments in */ 422 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 423 #define BC_F_SUSER 0x04 /* do super-user check */ 424 425 const struct bridge_control bridge_control_table[] = { 426 { bridge_ioctl_add, sizeof(struct ifbreq), 427 BC_F_COPYIN|BC_F_SUSER }, 428 { bridge_ioctl_del, sizeof(struct ifbreq), 429 BC_F_COPYIN|BC_F_SUSER }, 430 431 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 432 BC_F_COPYIN|BC_F_COPYOUT }, 433 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_scache, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 439 BC_F_COPYOUT }, 440 441 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 442 BC_F_COPYIN|BC_F_COPYOUT }, 443 { bridge_ioctl_rts, sizeof(struct ifbaconf), 444 BC_F_COPYIN|BC_F_COPYOUT }, 445 446 { bridge_ioctl_saddr, sizeof(struct ifbareq), 447 BC_F_COPYIN|BC_F_SUSER }, 448 449 { bridge_ioctl_sto, sizeof(struct ifbrparam), 450 BC_F_COPYIN|BC_F_SUSER }, 451 { bridge_ioctl_gto, sizeof(struct ifbrparam), 452 BC_F_COPYOUT }, 453 454 { bridge_ioctl_daddr, sizeof(struct ifbareq), 455 BC_F_COPYIN|BC_F_SUSER }, 456 457 { bridge_ioctl_flush, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 461 BC_F_COPYOUT }, 462 { bridge_ioctl_spri, sizeof(struct ifbrparam), 463 BC_F_COPYIN|BC_F_SUSER }, 464 465 { bridge_ioctl_ght, sizeof(struct ifbrparam), 466 BC_F_COPYOUT }, 467 { bridge_ioctl_sht, sizeof(struct ifbrparam), 468 BC_F_COPYIN|BC_F_SUSER }, 469 470 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 471 BC_F_COPYOUT }, 472 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 473 BC_F_COPYIN|BC_F_SUSER }, 474 475 { bridge_ioctl_gma, sizeof(struct ifbrparam), 476 BC_F_COPYOUT }, 477 { bridge_ioctl_sma, sizeof(struct ifbrparam), 478 BC_F_COPYIN|BC_F_SUSER }, 479 480 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 481 BC_F_COPYIN|BC_F_SUSER }, 482 483 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 484 BC_F_COPYIN|BC_F_SUSER }, 485 486 { bridge_ioctl_addspan, sizeof(struct ifbreq), 487 BC_F_COPYIN|BC_F_SUSER }, 488 { bridge_ioctl_delspan, sizeof(struct ifbreq), 489 BC_F_COPYIN|BC_F_SUSER }, 490 491 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 492 BC_F_COPYOUT }, 493 494 { bridge_ioctl_grte, sizeof(struct ifbrparam), 495 BC_F_COPYOUT }, 496 497 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 498 BC_F_COPYIN|BC_F_COPYOUT }, 499 500 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 501 BC_F_COPYIN|BC_F_SUSER }, 502 503 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 504 BC_F_COPYIN|BC_F_SUSER }, 505 506 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 507 BC_F_COPYIN|BC_F_SUSER }, 508 509 }; 510 const int bridge_control_table_size = nitems(bridge_control_table); 511 512 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list); 513 #define V_bridge_list VNET(bridge_list) 514 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \ 515 "if_bridge list", NULL, MTX_DEF) 516 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx) 517 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx) 518 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx) 519 520 static VNET_DEFINE(struct if_clone *, bridge_cloner); 521 #define V_bridge_cloner VNET(bridge_cloner) 522 523 static const char bridge_name[] = "bridge"; 524 525 static void 526 vnet_bridge_init(const void *unused __unused) 527 { 528 529 BRIDGE_LIST_LOCK_INIT(); 530 LIST_INIT(&V_bridge_list); 531 V_bridge_cloner = if_clone_simple(bridge_name, 532 bridge_clone_create, bridge_clone_destroy, 0); 533 } 534 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 535 vnet_bridge_init, NULL); 536 537 static void 538 vnet_bridge_uninit(const void *unused __unused) 539 { 540 541 if_clone_detach(V_bridge_cloner); 542 V_bridge_cloner = NULL; 543 BRIDGE_LIST_LOCK_DESTROY(); 544 } 545 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 546 vnet_bridge_uninit, NULL); 547 548 static int 549 bridge_modevent(module_t mod, int type, void *data) 550 { 551 552 switch (type) { 553 case MOD_LOAD: 554 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 555 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 556 UMA_ALIGN_PTR, 0); 557 bridge_input_p = bridge_input; 558 bridge_output_p = bridge_output; 559 bridge_dn_p = bridge_dummynet; 560 bridge_linkstate_p = bridge_linkstate; 561 bridge_detach_cookie = EVENTHANDLER_REGISTER( 562 ifnet_departure_event, bridge_ifdetach, NULL, 563 EVENTHANDLER_PRI_ANY); 564 break; 565 case MOD_UNLOAD: 566 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 567 bridge_detach_cookie); 568 uma_zdestroy(bridge_rtnode_zone); 569 bridge_input_p = NULL; 570 bridge_output_p = NULL; 571 bridge_dn_p = NULL; 572 bridge_linkstate_p = NULL; 573 break; 574 default: 575 return (EOPNOTSUPP); 576 } 577 return (0); 578 } 579 580 static moduledata_t bridge_mod = { 581 "if_bridge", 582 bridge_modevent, 583 0 584 }; 585 586 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 587 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 588 589 /* 590 * handler for net.link.bridge.ipfw 591 */ 592 static int 593 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 594 { 595 int enable = V_pfil_ipfw; 596 int error; 597 598 error = sysctl_handle_int(oidp, &enable, 0, req); 599 enable &= 1; 600 601 if (enable != V_pfil_ipfw) { 602 V_pfil_ipfw = enable; 603 604 /* 605 * Disable pfil so that ipfw doesnt run twice, if the user 606 * really wants both then they can re-enable pfil_bridge and/or 607 * pfil_member. Also allow non-ip packets as ipfw can filter by 608 * layer2 type. 609 */ 610 if (V_pfil_ipfw) { 611 V_pfil_onlyip = 0; 612 V_pfil_bridge = 0; 613 V_pfil_member = 0; 614 } 615 } 616 617 return (error); 618 } 619 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 620 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET, 621 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 622 "Layer2 filter with IPFW"); 623 624 /* 625 * bridge_clone_create: 626 * 627 * Create a new bridge instance. 628 */ 629 static int 630 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 631 { 632 struct bridge_softc *sc, *sc2; 633 struct ifnet *bifp, *ifp; 634 int fb, retry; 635 unsigned long hostid; 636 637 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 638 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 639 if (ifp == NULL) { 640 free(sc, M_DEVBUF); 641 return (ENOSPC); 642 } 643 644 BRIDGE_LOCK_INIT(sc); 645 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 646 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 647 648 /* Initialize our routing table. */ 649 bridge_rtable_init(sc); 650 651 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 652 653 LIST_INIT(&sc->sc_iflist); 654 LIST_INIT(&sc->sc_spanlist); 655 656 ifp->if_softc = sc; 657 if_initname(ifp, bridge_name, unit); 658 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 659 ifp->if_ioctl = bridge_ioctl; 660 ifp->if_transmit = bridge_transmit; 661 ifp->if_qflush = bridge_qflush; 662 ifp->if_init = bridge_init; 663 ifp->if_type = IFT_BRIDGE; 664 665 /* 666 * Generate an ethernet address with a locally administered address. 667 * 668 * Since we are using random ethernet addresses for the bridge, it is 669 * possible that we might have address collisions, so make sure that 670 * this hardware address isn't already in use on another bridge. 671 * The first try uses the hostid and falls back to arc4rand(). 672 */ 673 fb = 0; 674 getcredhostid(curthread->td_ucred, &hostid); 675 do { 676 if (fb || hostid == 0) { 677 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 678 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 679 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 680 } else { 681 sc->sc_defaddr[0] = 0x2; 682 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 683 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 684 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 685 sc->sc_defaddr[4] = hostid & 0xff; 686 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 687 } 688 689 fb = 1; 690 retry = 0; 691 BRIDGE_LIST_LOCK(); 692 LIST_FOREACH(sc2, &V_bridge_list, sc_list) { 693 bifp = sc2->sc_ifp; 694 if (memcmp(sc->sc_defaddr, 695 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 696 retry = 1; 697 break; 698 } 699 } 700 BRIDGE_LIST_UNLOCK(); 701 } while (retry == 1); 702 703 bstp_attach(&sc->sc_stp, &bridge_ops); 704 ether_ifattach(ifp, sc->sc_defaddr); 705 /* Now undo some of the damage... */ 706 ifp->if_baudrate = 0; 707 ifp->if_type = IFT_BRIDGE; 708 709 BRIDGE_LIST_LOCK(); 710 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 711 BRIDGE_LIST_UNLOCK(); 712 713 return (0); 714 } 715 716 /* 717 * bridge_clone_destroy: 718 * 719 * Destroy a bridge instance. 720 */ 721 static void 722 bridge_clone_destroy(struct ifnet *ifp) 723 { 724 struct bridge_softc *sc = ifp->if_softc; 725 struct bridge_iflist *bif; 726 727 BRIDGE_LOCK(sc); 728 729 bridge_stop(ifp, 1); 730 ifp->if_flags &= ~IFF_UP; 731 732 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 733 bridge_delete_member(sc, bif, 0); 734 735 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 736 bridge_delete_span(sc, bif); 737 } 738 739 BRIDGE_UNLOCK(sc); 740 741 callout_drain(&sc->sc_brcallout); 742 743 BRIDGE_LIST_LOCK(); 744 LIST_REMOVE(sc, sc_list); 745 BRIDGE_LIST_UNLOCK(); 746 747 bstp_detach(&sc->sc_stp); 748 ether_ifdetach(ifp); 749 if_free(ifp); 750 751 /* Tear down the routing table. */ 752 bridge_rtable_fini(sc); 753 754 BRIDGE_LOCK_DESTROY(sc); 755 free(sc, M_DEVBUF); 756 } 757 758 /* 759 * bridge_ioctl: 760 * 761 * Handle a control request from the operator. 762 */ 763 static int 764 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 765 { 766 struct bridge_softc *sc = ifp->if_softc; 767 struct ifreq *ifr = (struct ifreq *)data; 768 struct bridge_iflist *bif; 769 struct thread *td = curthread; 770 union { 771 struct ifbreq ifbreq; 772 struct ifbifconf ifbifconf; 773 struct ifbareq ifbareq; 774 struct ifbaconf ifbaconf; 775 struct ifbrparam ifbrparam; 776 struct ifbropreq ifbropreq; 777 } args; 778 struct ifdrv *ifd = (struct ifdrv *) data; 779 const struct bridge_control *bc; 780 int error = 0; 781 782 switch (cmd) { 783 784 case SIOCADDMULTI: 785 case SIOCDELMULTI: 786 break; 787 788 case SIOCGDRVSPEC: 789 case SIOCSDRVSPEC: 790 if (ifd->ifd_cmd >= bridge_control_table_size) { 791 error = EINVAL; 792 break; 793 } 794 bc = &bridge_control_table[ifd->ifd_cmd]; 795 796 if (cmd == SIOCGDRVSPEC && 797 (bc->bc_flags & BC_F_COPYOUT) == 0) { 798 error = EINVAL; 799 break; 800 } 801 else if (cmd == SIOCSDRVSPEC && 802 (bc->bc_flags & BC_F_COPYOUT) != 0) { 803 error = EINVAL; 804 break; 805 } 806 807 if (bc->bc_flags & BC_F_SUSER) { 808 error = priv_check(td, PRIV_NET_BRIDGE); 809 if (error) 810 break; 811 } 812 813 if (ifd->ifd_len != bc->bc_argsize || 814 ifd->ifd_len > sizeof(args)) { 815 error = EINVAL; 816 break; 817 } 818 819 bzero(&args, sizeof(args)); 820 if (bc->bc_flags & BC_F_COPYIN) { 821 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 822 if (error) 823 break; 824 } 825 826 BRIDGE_LOCK(sc); 827 error = (*bc->bc_func)(sc, &args); 828 BRIDGE_UNLOCK(sc); 829 if (error) 830 break; 831 832 if (bc->bc_flags & BC_F_COPYOUT) 833 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 834 835 break; 836 837 case SIOCSIFFLAGS: 838 if (!(ifp->if_flags & IFF_UP) && 839 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 840 /* 841 * If interface is marked down and it is running, 842 * then stop and disable it. 843 */ 844 BRIDGE_LOCK(sc); 845 bridge_stop(ifp, 1); 846 BRIDGE_UNLOCK(sc); 847 } else if ((ifp->if_flags & IFF_UP) && 848 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 849 /* 850 * If interface is marked up and it is stopped, then 851 * start it. 852 */ 853 (*ifp->if_init)(sc); 854 } 855 break; 856 857 case SIOCSIFMTU: 858 if (ifr->ifr_mtu < 576) { 859 error = EINVAL; 860 break; 861 } 862 if (LIST_EMPTY(&sc->sc_iflist)) { 863 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 864 break; 865 } 866 BRIDGE_LOCK(sc); 867 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 868 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 869 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 870 " != %d\n", sc->sc_ifp->if_xname, 871 bif->bif_ifp->if_mtu, 872 bif->bif_ifp->if_xname, ifr->ifr_mtu); 873 error = EINVAL; 874 break; 875 } 876 } 877 if (!error) 878 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 879 BRIDGE_UNLOCK(sc); 880 break; 881 default: 882 /* 883 * drop the lock as ether_ioctl() will call bridge_start() and 884 * cause the lock to be recursed. 885 */ 886 error = ether_ioctl(ifp, cmd, data); 887 break; 888 } 889 890 return (error); 891 } 892 893 /* 894 * bridge_mutecaps: 895 * 896 * Clear or restore unwanted capabilities on the member interface 897 */ 898 static void 899 bridge_mutecaps(struct bridge_softc *sc) 900 { 901 struct bridge_iflist *bif; 902 int enabled, mask; 903 904 /* Initial bitmask of capabilities to test */ 905 mask = BRIDGE_IFCAPS_MASK; 906 907 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 908 /* Every member must support it or its disabled */ 909 mask &= bif->bif_savedcaps; 910 } 911 912 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 913 enabled = bif->bif_ifp->if_capenable; 914 enabled &= ~BRIDGE_IFCAPS_STRIP; 915 /* strip off mask bits and enable them again if allowed */ 916 enabled &= ~BRIDGE_IFCAPS_MASK; 917 enabled |= mask; 918 bridge_set_ifcap(sc, bif, enabled); 919 } 920 921 } 922 923 static void 924 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 925 { 926 struct ifnet *ifp = bif->bif_ifp; 927 struct ifreq ifr; 928 int error; 929 930 bzero(&ifr, sizeof(ifr)); 931 ifr.ifr_reqcap = set; 932 933 if (ifp->if_capenable != set) { 934 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 935 if (error) 936 if_printf(sc->sc_ifp, 937 "error setting interface capabilities on %s\n", 938 ifp->if_xname); 939 } 940 } 941 942 /* 943 * bridge_lookup_member: 944 * 945 * Lookup a bridge member interface. 946 */ 947 static struct bridge_iflist * 948 bridge_lookup_member(struct bridge_softc *sc, const char *name) 949 { 950 struct bridge_iflist *bif; 951 struct ifnet *ifp; 952 953 BRIDGE_LOCK_ASSERT(sc); 954 955 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 956 ifp = bif->bif_ifp; 957 if (strcmp(ifp->if_xname, name) == 0) 958 return (bif); 959 } 960 961 return (NULL); 962 } 963 964 /* 965 * bridge_lookup_member_if: 966 * 967 * Lookup a bridge member interface by ifnet*. 968 */ 969 static struct bridge_iflist * 970 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 971 { 972 struct bridge_iflist *bif; 973 974 BRIDGE_LOCK_ASSERT(sc); 975 976 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 977 if (bif->bif_ifp == member_ifp) 978 return (bif); 979 } 980 981 return (NULL); 982 } 983 984 /* 985 * bridge_delete_member: 986 * 987 * Delete the specified member interface. 988 */ 989 static void 990 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 991 int gone) 992 { 993 struct ifnet *ifs = bif->bif_ifp; 994 struct ifnet *fif = NULL; 995 996 BRIDGE_LOCK_ASSERT(sc); 997 998 if (bif->bif_flags & IFBIF_STP) 999 bstp_disable(&bif->bif_stp); 1000 1001 ifs->if_bridge = NULL; 1002 BRIDGE_XLOCK(sc); 1003 LIST_REMOVE(bif, bif_next); 1004 BRIDGE_XDROP(sc); 1005 1006 /* 1007 * If removing the interface that gave the bridge its mac address, set 1008 * the mac address of the bridge to the address of the next member, or 1009 * to its default address if no members are left. 1010 */ 1011 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1012 if (LIST_EMPTY(&sc->sc_iflist)) { 1013 bcopy(sc->sc_defaddr, 1014 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1015 sc->sc_ifaddr = NULL; 1016 } else { 1017 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 1018 bcopy(IF_LLADDR(fif), 1019 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1020 sc->sc_ifaddr = fif; 1021 } 1022 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1023 } 1024 1025 bridge_linkcheck(sc); 1026 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1027 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1028 KASSERT(bif->bif_addrcnt == 0, 1029 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1030 1031 BRIDGE_UNLOCK(sc); 1032 if (!gone) { 1033 switch (ifs->if_type) { 1034 case IFT_ETHER: 1035 case IFT_L2VLAN: 1036 /* 1037 * Take the interface out of promiscuous mode, but only 1038 * if it was promiscuous in the first place. It might 1039 * not be if we're in the bridge_ioctl_add() error path. 1040 */ 1041 if (ifs->if_flags & IFF_PROMISC) 1042 (void) ifpromisc(ifs, 0); 1043 break; 1044 1045 case IFT_GIF: 1046 break; 1047 1048 default: 1049 #ifdef DIAGNOSTIC 1050 panic("bridge_delete_member: impossible"); 1051 #endif 1052 break; 1053 } 1054 /* reneable any interface capabilities */ 1055 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1056 } 1057 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1058 BRIDGE_LOCK(sc); 1059 free(bif, M_DEVBUF); 1060 } 1061 1062 /* 1063 * bridge_delete_span: 1064 * 1065 * Delete the specified span interface. 1066 */ 1067 static void 1068 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1069 { 1070 BRIDGE_LOCK_ASSERT(sc); 1071 1072 KASSERT(bif->bif_ifp->if_bridge == NULL, 1073 ("%s: not a span interface", __func__)); 1074 1075 LIST_REMOVE(bif, bif_next); 1076 free(bif, M_DEVBUF); 1077 } 1078 1079 static int 1080 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1081 { 1082 struct ifbreq *req = arg; 1083 struct bridge_iflist *bif = NULL; 1084 struct ifnet *ifs; 1085 int error = 0; 1086 1087 ifs = ifunit(req->ifbr_ifsname); 1088 if (ifs == NULL) 1089 return (ENOENT); 1090 if (ifs->if_ioctl == NULL) /* must be supported */ 1091 return (EINVAL); 1092 1093 /* If it's in the span list, it can't be a member. */ 1094 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1095 if (ifs == bif->bif_ifp) 1096 return (EBUSY); 1097 1098 if (ifs->if_bridge == sc) 1099 return (EEXIST); 1100 1101 if (ifs->if_bridge != NULL) 1102 return (EBUSY); 1103 1104 switch (ifs->if_type) { 1105 case IFT_ETHER: 1106 case IFT_L2VLAN: 1107 case IFT_GIF: 1108 /* permitted interface types */ 1109 break; 1110 default: 1111 return (EINVAL); 1112 } 1113 1114 #ifdef INET6 1115 /* 1116 * Two valid inet6 addresses with link-local scope must not be 1117 * on the parent interface and the member interfaces at the 1118 * same time. This restriction is needed to prevent violation 1119 * of link-local scope zone. Attempts to add a member 1120 * interface which has inet6 addresses when the parent has 1121 * inet6 triggers removal of all inet6 addresses on the member 1122 * interface. 1123 */ 1124 1125 /* Check if the parent interface has a link-local scope addr. */ 1126 if (V_allow_llz_overlap == 0 && 1127 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1128 /* 1129 * If any, remove all inet6 addresses from the member 1130 * interfaces. 1131 */ 1132 BRIDGE_XLOCK(sc); 1133 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1134 if (in6ifa_llaonifp(bif->bif_ifp)) { 1135 BRIDGE_UNLOCK(sc); 1136 in6_ifdetach(bif->bif_ifp); 1137 BRIDGE_LOCK(sc); 1138 if_printf(sc->sc_ifp, 1139 "IPv6 addresses on %s have been removed " 1140 "before adding it as a member to prevent " 1141 "IPv6 address scope violation.\n", 1142 bif->bif_ifp->if_xname); 1143 } 1144 } 1145 BRIDGE_XDROP(sc); 1146 if (in6ifa_llaonifp(ifs)) { 1147 BRIDGE_UNLOCK(sc); 1148 in6_ifdetach(ifs); 1149 BRIDGE_LOCK(sc); 1150 if_printf(sc->sc_ifp, 1151 "IPv6 addresses on %s have been removed " 1152 "before adding it as a member to prevent " 1153 "IPv6 address scope violation.\n", 1154 ifs->if_xname); 1155 } 1156 } 1157 #endif 1158 /* Allow the first Ethernet member to define the MTU */ 1159 if (LIST_EMPTY(&sc->sc_iflist)) 1160 sc->sc_ifp->if_mtu = ifs->if_mtu; 1161 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1162 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1163 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1164 return (EINVAL); 1165 } 1166 1167 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1168 if (bif == NULL) 1169 return (ENOMEM); 1170 1171 bif->bif_ifp = ifs; 1172 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1173 bif->bif_savedcaps = ifs->if_capenable; 1174 1175 /* 1176 * Assign the interface's MAC address to the bridge if it's the first 1177 * member and the MAC address of the bridge has not been changed from 1178 * the default randomly generated one. 1179 */ 1180 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1181 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1182 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1183 sc->sc_ifaddr = ifs; 1184 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1185 } 1186 1187 ifs->if_bridge = sc; 1188 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1189 /* 1190 * XXX: XLOCK HERE!?! 1191 * 1192 * NOTE: insert_***HEAD*** should be safe for the traversals. 1193 */ 1194 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1195 1196 /* Set interface capabilities to the intersection set of all members */ 1197 bridge_mutecaps(sc); 1198 bridge_linkcheck(sc); 1199 1200 /* Place the interface into promiscuous mode */ 1201 switch (ifs->if_type) { 1202 case IFT_ETHER: 1203 case IFT_L2VLAN: 1204 BRIDGE_UNLOCK(sc); 1205 error = ifpromisc(ifs, 1); 1206 BRIDGE_LOCK(sc); 1207 break; 1208 } 1209 1210 if (error) 1211 bridge_delete_member(sc, bif, 0); 1212 return (error); 1213 } 1214 1215 static int 1216 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1217 { 1218 struct ifbreq *req = arg; 1219 struct bridge_iflist *bif; 1220 1221 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1222 if (bif == NULL) 1223 return (ENOENT); 1224 1225 bridge_delete_member(sc, bif, 0); 1226 1227 return (0); 1228 } 1229 1230 static int 1231 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1232 { 1233 struct ifbreq *req = arg; 1234 struct bridge_iflist *bif; 1235 struct bstp_port *bp; 1236 1237 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1238 if (bif == NULL) 1239 return (ENOENT); 1240 1241 bp = &bif->bif_stp; 1242 req->ifbr_ifsflags = bif->bif_flags; 1243 req->ifbr_state = bp->bp_state; 1244 req->ifbr_priority = bp->bp_priority; 1245 req->ifbr_path_cost = bp->bp_path_cost; 1246 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1247 req->ifbr_proto = bp->bp_protover; 1248 req->ifbr_role = bp->bp_role; 1249 req->ifbr_stpflags = bp->bp_flags; 1250 req->ifbr_addrcnt = bif->bif_addrcnt; 1251 req->ifbr_addrmax = bif->bif_addrmax; 1252 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1253 1254 /* Copy STP state options as flags */ 1255 if (bp->bp_operedge) 1256 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1257 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1258 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1259 if (bp->bp_ptp_link) 1260 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1261 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1262 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1263 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1264 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1265 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1266 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1267 return (0); 1268 } 1269 1270 static int 1271 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1272 { 1273 struct ifbreq *req = arg; 1274 struct bridge_iflist *bif; 1275 struct bstp_port *bp; 1276 int error; 1277 1278 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1279 if (bif == NULL) 1280 return (ENOENT); 1281 bp = &bif->bif_stp; 1282 1283 if (req->ifbr_ifsflags & IFBIF_SPAN) 1284 /* SPAN is readonly */ 1285 return (EINVAL); 1286 1287 if (req->ifbr_ifsflags & IFBIF_STP) { 1288 if ((bif->bif_flags & IFBIF_STP) == 0) { 1289 error = bstp_enable(&bif->bif_stp); 1290 if (error) 1291 return (error); 1292 } 1293 } else { 1294 if ((bif->bif_flags & IFBIF_STP) != 0) 1295 bstp_disable(&bif->bif_stp); 1296 } 1297 1298 /* Pass on STP flags */ 1299 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1300 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1301 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1302 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1303 1304 /* Save the bits relating to the bridge */ 1305 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1306 1307 return (0); 1308 } 1309 1310 static int 1311 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1312 { 1313 struct ifbrparam *param = arg; 1314 1315 sc->sc_brtmax = param->ifbrp_csize; 1316 bridge_rttrim(sc); 1317 1318 return (0); 1319 } 1320 1321 static int 1322 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1323 { 1324 struct ifbrparam *param = arg; 1325 1326 param->ifbrp_csize = sc->sc_brtmax; 1327 1328 return (0); 1329 } 1330 1331 static int 1332 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1333 { 1334 struct ifbifconf *bifc = arg; 1335 struct bridge_iflist *bif; 1336 struct ifbreq breq; 1337 char *buf, *outbuf; 1338 int count, buflen, len, error = 0; 1339 1340 count = 0; 1341 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1342 count++; 1343 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1344 count++; 1345 1346 buflen = sizeof(breq) * count; 1347 if (bifc->ifbic_len == 0) { 1348 bifc->ifbic_len = buflen; 1349 return (0); 1350 } 1351 BRIDGE_UNLOCK(sc); 1352 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1353 BRIDGE_LOCK(sc); 1354 1355 count = 0; 1356 buf = outbuf; 1357 len = min(bifc->ifbic_len, buflen); 1358 bzero(&breq, sizeof(breq)); 1359 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1360 if (len < sizeof(breq)) 1361 break; 1362 1363 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1364 sizeof(breq.ifbr_ifsname)); 1365 /* Fill in the ifbreq structure */ 1366 error = bridge_ioctl_gifflags(sc, &breq); 1367 if (error) 1368 break; 1369 memcpy(buf, &breq, sizeof(breq)); 1370 count++; 1371 buf += sizeof(breq); 1372 len -= sizeof(breq); 1373 } 1374 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1375 if (len < sizeof(breq)) 1376 break; 1377 1378 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1379 sizeof(breq.ifbr_ifsname)); 1380 breq.ifbr_ifsflags = bif->bif_flags; 1381 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1382 memcpy(buf, &breq, sizeof(breq)); 1383 count++; 1384 buf += sizeof(breq); 1385 len -= sizeof(breq); 1386 } 1387 1388 BRIDGE_UNLOCK(sc); 1389 bifc->ifbic_len = sizeof(breq) * count; 1390 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1391 BRIDGE_LOCK(sc); 1392 free(outbuf, M_TEMP); 1393 return (error); 1394 } 1395 1396 static int 1397 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1398 { 1399 struct ifbaconf *bac = arg; 1400 struct bridge_rtnode *brt; 1401 struct ifbareq bareq; 1402 char *buf, *outbuf; 1403 int count, buflen, len, error = 0; 1404 1405 if (bac->ifbac_len == 0) 1406 return (0); 1407 1408 count = 0; 1409 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1410 count++; 1411 buflen = sizeof(bareq) * count; 1412 1413 BRIDGE_UNLOCK(sc); 1414 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1415 BRIDGE_LOCK(sc); 1416 1417 count = 0; 1418 buf = outbuf; 1419 len = min(bac->ifbac_len, buflen); 1420 bzero(&bareq, sizeof(bareq)); 1421 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1422 if (len < sizeof(bareq)) 1423 goto out; 1424 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1425 sizeof(bareq.ifba_ifsname)); 1426 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1427 bareq.ifba_vlan = brt->brt_vlan; 1428 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1429 time_uptime < brt->brt_expire) 1430 bareq.ifba_expire = brt->brt_expire - time_uptime; 1431 else 1432 bareq.ifba_expire = 0; 1433 bareq.ifba_flags = brt->brt_flags; 1434 1435 memcpy(buf, &bareq, sizeof(bareq)); 1436 count++; 1437 buf += sizeof(bareq); 1438 len -= sizeof(bareq); 1439 } 1440 out: 1441 BRIDGE_UNLOCK(sc); 1442 bac->ifbac_len = sizeof(bareq) * count; 1443 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1444 BRIDGE_LOCK(sc); 1445 free(outbuf, M_TEMP); 1446 return (error); 1447 } 1448 1449 static int 1450 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1451 { 1452 struct ifbareq *req = arg; 1453 struct bridge_iflist *bif; 1454 int error; 1455 1456 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1457 if (bif == NULL) 1458 return (ENOENT); 1459 1460 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1461 req->ifba_flags); 1462 1463 return (error); 1464 } 1465 1466 static int 1467 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1468 { 1469 struct ifbrparam *param = arg; 1470 1471 sc->sc_brttimeout = param->ifbrp_ctime; 1472 return (0); 1473 } 1474 1475 static int 1476 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1477 { 1478 struct ifbrparam *param = arg; 1479 1480 param->ifbrp_ctime = sc->sc_brttimeout; 1481 return (0); 1482 } 1483 1484 static int 1485 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1486 { 1487 struct ifbareq *req = arg; 1488 1489 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1490 } 1491 1492 static int 1493 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1494 { 1495 struct ifbreq *req = arg; 1496 1497 bridge_rtflush(sc, req->ifbr_ifsflags); 1498 return (0); 1499 } 1500 1501 static int 1502 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1503 { 1504 struct ifbrparam *param = arg; 1505 struct bstp_state *bs = &sc->sc_stp; 1506 1507 param->ifbrp_prio = bs->bs_bridge_priority; 1508 return (0); 1509 } 1510 1511 static int 1512 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1513 { 1514 struct ifbrparam *param = arg; 1515 1516 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1517 } 1518 1519 static int 1520 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1521 { 1522 struct ifbrparam *param = arg; 1523 struct bstp_state *bs = &sc->sc_stp; 1524 1525 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1526 return (0); 1527 } 1528 1529 static int 1530 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1531 { 1532 struct ifbrparam *param = arg; 1533 1534 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1535 } 1536 1537 static int 1538 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1539 { 1540 struct ifbrparam *param = arg; 1541 struct bstp_state *bs = &sc->sc_stp; 1542 1543 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1544 return (0); 1545 } 1546 1547 static int 1548 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1549 { 1550 struct ifbrparam *param = arg; 1551 1552 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1553 } 1554 1555 static int 1556 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1557 { 1558 struct ifbrparam *param = arg; 1559 struct bstp_state *bs = &sc->sc_stp; 1560 1561 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1562 return (0); 1563 } 1564 1565 static int 1566 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1567 { 1568 struct ifbrparam *param = arg; 1569 1570 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1571 } 1572 1573 static int 1574 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1575 { 1576 struct ifbreq *req = arg; 1577 struct bridge_iflist *bif; 1578 1579 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1580 if (bif == NULL) 1581 return (ENOENT); 1582 1583 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1584 } 1585 1586 static int 1587 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1588 { 1589 struct ifbreq *req = arg; 1590 struct bridge_iflist *bif; 1591 1592 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1593 if (bif == NULL) 1594 return (ENOENT); 1595 1596 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1597 } 1598 1599 static int 1600 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1601 { 1602 struct ifbreq *req = arg; 1603 struct bridge_iflist *bif; 1604 1605 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1606 if (bif == NULL) 1607 return (ENOENT); 1608 1609 bif->bif_addrmax = req->ifbr_addrmax; 1610 return (0); 1611 } 1612 1613 static int 1614 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1615 { 1616 struct ifbreq *req = arg; 1617 struct bridge_iflist *bif = NULL; 1618 struct ifnet *ifs; 1619 1620 ifs = ifunit(req->ifbr_ifsname); 1621 if (ifs == NULL) 1622 return (ENOENT); 1623 1624 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1625 if (ifs == bif->bif_ifp) 1626 return (EBUSY); 1627 1628 if (ifs->if_bridge != NULL) 1629 return (EBUSY); 1630 1631 switch (ifs->if_type) { 1632 case IFT_ETHER: 1633 case IFT_GIF: 1634 case IFT_L2VLAN: 1635 break; 1636 default: 1637 return (EINVAL); 1638 } 1639 1640 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1641 if (bif == NULL) 1642 return (ENOMEM); 1643 1644 bif->bif_ifp = ifs; 1645 bif->bif_flags = IFBIF_SPAN; 1646 1647 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1648 1649 return (0); 1650 } 1651 1652 static int 1653 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1654 { 1655 struct ifbreq *req = arg; 1656 struct bridge_iflist *bif; 1657 struct ifnet *ifs; 1658 1659 ifs = ifunit(req->ifbr_ifsname); 1660 if (ifs == NULL) 1661 return (ENOENT); 1662 1663 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1664 if (ifs == bif->bif_ifp) 1665 break; 1666 1667 if (bif == NULL) 1668 return (ENOENT); 1669 1670 bridge_delete_span(sc, bif); 1671 1672 return (0); 1673 } 1674 1675 static int 1676 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1677 { 1678 struct ifbropreq *req = arg; 1679 struct bstp_state *bs = &sc->sc_stp; 1680 struct bstp_port *root_port; 1681 1682 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1683 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1684 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1685 1686 root_port = bs->bs_root_port; 1687 if (root_port == NULL) 1688 req->ifbop_root_port = 0; 1689 else 1690 req->ifbop_root_port = root_port->bp_ifp->if_index; 1691 1692 req->ifbop_holdcount = bs->bs_txholdcount; 1693 req->ifbop_priority = bs->bs_bridge_priority; 1694 req->ifbop_protocol = bs->bs_protover; 1695 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1696 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1697 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1698 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1699 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1700 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1701 1702 return (0); 1703 } 1704 1705 static int 1706 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1707 { 1708 struct ifbrparam *param = arg; 1709 1710 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1711 return (0); 1712 } 1713 1714 static int 1715 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1716 { 1717 struct ifbpstpconf *bifstp = arg; 1718 struct bridge_iflist *bif; 1719 struct bstp_port *bp; 1720 struct ifbpstpreq bpreq; 1721 char *buf, *outbuf; 1722 int count, buflen, len, error = 0; 1723 1724 count = 0; 1725 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1726 if ((bif->bif_flags & IFBIF_STP) != 0) 1727 count++; 1728 } 1729 1730 buflen = sizeof(bpreq) * count; 1731 if (bifstp->ifbpstp_len == 0) { 1732 bifstp->ifbpstp_len = buflen; 1733 return (0); 1734 } 1735 1736 BRIDGE_UNLOCK(sc); 1737 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1738 BRIDGE_LOCK(sc); 1739 1740 count = 0; 1741 buf = outbuf; 1742 len = min(bifstp->ifbpstp_len, buflen); 1743 bzero(&bpreq, sizeof(bpreq)); 1744 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1745 if (len < sizeof(bpreq)) 1746 break; 1747 1748 if ((bif->bif_flags & IFBIF_STP) == 0) 1749 continue; 1750 1751 bp = &bif->bif_stp; 1752 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1753 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1754 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1755 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1756 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1757 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1758 1759 memcpy(buf, &bpreq, sizeof(bpreq)); 1760 count++; 1761 buf += sizeof(bpreq); 1762 len -= sizeof(bpreq); 1763 } 1764 1765 BRIDGE_UNLOCK(sc); 1766 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1767 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1768 BRIDGE_LOCK(sc); 1769 free(outbuf, M_TEMP); 1770 return (error); 1771 } 1772 1773 static int 1774 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1775 { 1776 struct ifbrparam *param = arg; 1777 1778 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1779 } 1780 1781 static int 1782 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1783 { 1784 struct ifbrparam *param = arg; 1785 1786 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1787 } 1788 1789 /* 1790 * bridge_ifdetach: 1791 * 1792 * Detach an interface from a bridge. Called when a member 1793 * interface is detaching. 1794 */ 1795 static void 1796 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1797 { 1798 struct bridge_softc *sc = ifp->if_bridge; 1799 struct bridge_iflist *bif; 1800 1801 if (ifp->if_flags & IFF_RENAMING) 1802 return; 1803 if (V_bridge_cloner == NULL) { 1804 /* 1805 * This detach handler can be called after 1806 * vnet_bridge_uninit(). Just return in that case. 1807 */ 1808 return; 1809 } 1810 /* Check if the interface is a bridge member */ 1811 if (sc != NULL) { 1812 BRIDGE_LOCK(sc); 1813 1814 bif = bridge_lookup_member_if(sc, ifp); 1815 if (bif != NULL) 1816 bridge_delete_member(sc, bif, 1); 1817 1818 BRIDGE_UNLOCK(sc); 1819 return; 1820 } 1821 1822 /* Check if the interface is a span port */ 1823 BRIDGE_LIST_LOCK(); 1824 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1825 BRIDGE_LOCK(sc); 1826 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1827 if (ifp == bif->bif_ifp) { 1828 bridge_delete_span(sc, bif); 1829 break; 1830 } 1831 1832 BRIDGE_UNLOCK(sc); 1833 } 1834 BRIDGE_LIST_UNLOCK(); 1835 } 1836 1837 /* 1838 * bridge_init: 1839 * 1840 * Initialize a bridge interface. 1841 */ 1842 static void 1843 bridge_init(void *xsc) 1844 { 1845 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1846 struct ifnet *ifp = sc->sc_ifp; 1847 1848 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1849 return; 1850 1851 BRIDGE_LOCK(sc); 1852 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1853 bridge_timer, sc); 1854 1855 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1856 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1857 1858 BRIDGE_UNLOCK(sc); 1859 } 1860 1861 /* 1862 * bridge_stop: 1863 * 1864 * Stop the bridge interface. 1865 */ 1866 static void 1867 bridge_stop(struct ifnet *ifp, int disable) 1868 { 1869 struct bridge_softc *sc = ifp->if_softc; 1870 1871 BRIDGE_LOCK_ASSERT(sc); 1872 1873 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1874 return; 1875 1876 callout_stop(&sc->sc_brcallout); 1877 bstp_stop(&sc->sc_stp); 1878 1879 bridge_rtflush(sc, IFBF_FLUSHDYN); 1880 1881 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1882 } 1883 1884 /* 1885 * bridge_enqueue: 1886 * 1887 * Enqueue a packet on a bridge member interface. 1888 * 1889 */ 1890 static int 1891 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1892 { 1893 int len, err = 0; 1894 short mflags; 1895 struct mbuf *m0; 1896 1897 /* We may be sending a fragment so traverse the mbuf */ 1898 for (; m; m = m0) { 1899 m0 = m->m_nextpkt; 1900 m->m_nextpkt = NULL; 1901 len = m->m_pkthdr.len; 1902 mflags = m->m_flags; 1903 1904 /* 1905 * If underlying interface can not do VLAN tag insertion itself 1906 * then attach a packet tag that holds it. 1907 */ 1908 if ((m->m_flags & M_VLANTAG) && 1909 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1910 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1911 if (m == NULL) { 1912 if_printf(dst_ifp, 1913 "unable to prepend VLAN header\n"); 1914 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 1915 continue; 1916 } 1917 m->m_flags &= ~M_VLANTAG; 1918 } 1919 1920 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 1921 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1922 m_freem(m0); 1923 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1924 break; 1925 } 1926 1927 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 1928 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 1929 if (mflags & M_MCAST) 1930 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 1931 } 1932 1933 return (err); 1934 } 1935 1936 /* 1937 * bridge_dummynet: 1938 * 1939 * Receive a queued packet from dummynet and pass it on to the output 1940 * interface. 1941 * 1942 * The mbuf has the Ethernet header already attached. 1943 */ 1944 static void 1945 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1946 { 1947 struct bridge_softc *sc; 1948 1949 sc = ifp->if_bridge; 1950 1951 /* 1952 * The packet didnt originate from a member interface. This should only 1953 * ever happen if a member interface is removed while packets are 1954 * queued for it. 1955 */ 1956 if (sc == NULL) { 1957 m_freem(m); 1958 return; 1959 } 1960 1961 if (PFIL_HOOKED(&V_inet_pfil_hook) 1962 #ifdef INET6 1963 || PFIL_HOOKED(&V_inet6_pfil_hook) 1964 #endif 1965 ) { 1966 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1967 return; 1968 if (m == NULL) 1969 return; 1970 } 1971 1972 bridge_enqueue(sc, ifp, m); 1973 } 1974 1975 /* 1976 * bridge_output: 1977 * 1978 * Send output from a bridge member interface. This 1979 * performs the bridging function for locally originated 1980 * packets. 1981 * 1982 * The mbuf has the Ethernet header already attached. We must 1983 * enqueue or free the mbuf before returning. 1984 */ 1985 static int 1986 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1987 struct rtentry *rt) 1988 { 1989 struct ether_header *eh; 1990 struct ifnet *dst_if; 1991 struct bridge_softc *sc; 1992 uint16_t vlan; 1993 1994 if (m->m_len < ETHER_HDR_LEN) { 1995 m = m_pullup(m, ETHER_HDR_LEN); 1996 if (m == NULL) 1997 return (0); 1998 } 1999 2000 eh = mtod(m, struct ether_header *); 2001 sc = ifp->if_bridge; 2002 vlan = VLANTAGOF(m); 2003 2004 BRIDGE_LOCK(sc); 2005 2006 /* 2007 * If bridge is down, but the original output interface is up, 2008 * go ahead and send out that interface. Otherwise, the packet 2009 * is dropped below. 2010 */ 2011 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2012 dst_if = ifp; 2013 goto sendunicast; 2014 } 2015 2016 /* 2017 * If the packet is a multicast, or we don't know a better way to 2018 * get there, send to all interfaces. 2019 */ 2020 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2021 dst_if = NULL; 2022 else 2023 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2024 if (dst_if == NULL) { 2025 struct bridge_iflist *bif; 2026 struct mbuf *mc; 2027 int error = 0, used = 0; 2028 2029 bridge_span(sc, m); 2030 2031 BRIDGE_LOCK2REF(sc, error); 2032 if (error) { 2033 m_freem(m); 2034 return (0); 2035 } 2036 2037 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2038 dst_if = bif->bif_ifp; 2039 2040 if (dst_if->if_type == IFT_GIF) 2041 continue; 2042 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2043 continue; 2044 2045 /* 2046 * If this is not the original output interface, 2047 * and the interface is participating in spanning 2048 * tree, make sure the port is in a state that 2049 * allows forwarding. 2050 */ 2051 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2052 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2053 continue; 2054 2055 if (LIST_NEXT(bif, bif_next) == NULL) { 2056 used = 1; 2057 mc = m; 2058 } else { 2059 mc = m_copypacket(m, M_NOWAIT); 2060 if (mc == NULL) { 2061 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2062 continue; 2063 } 2064 } 2065 2066 bridge_enqueue(sc, dst_if, mc); 2067 } 2068 if (used == 0) 2069 m_freem(m); 2070 BRIDGE_UNREF(sc); 2071 return (0); 2072 } 2073 2074 sendunicast: 2075 /* 2076 * XXX Spanning tree consideration here? 2077 */ 2078 2079 bridge_span(sc, m); 2080 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2081 m_freem(m); 2082 BRIDGE_UNLOCK(sc); 2083 return (0); 2084 } 2085 2086 BRIDGE_UNLOCK(sc); 2087 bridge_enqueue(sc, dst_if, m); 2088 return (0); 2089 } 2090 2091 /* 2092 * bridge_transmit: 2093 * 2094 * Do output on a bridge. 2095 * 2096 */ 2097 static int 2098 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2099 { 2100 struct bridge_softc *sc; 2101 struct ether_header *eh; 2102 struct ifnet *dst_if; 2103 int error = 0; 2104 2105 sc = ifp->if_softc; 2106 2107 ETHER_BPF_MTAP(ifp, m); 2108 2109 eh = mtod(m, struct ether_header *); 2110 2111 BRIDGE_LOCK(sc); 2112 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2113 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2114 BRIDGE_UNLOCK(sc); 2115 error = bridge_enqueue(sc, dst_if, m); 2116 } else 2117 bridge_broadcast(sc, ifp, m, 0); 2118 2119 return (error); 2120 } 2121 2122 /* 2123 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2124 */ 2125 static void 2126 bridge_qflush(struct ifnet *ifp __unused) 2127 { 2128 } 2129 2130 /* 2131 * bridge_forward: 2132 * 2133 * The forwarding function of the bridge. 2134 * 2135 * NOTE: Releases the lock on return. 2136 */ 2137 static void 2138 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2139 struct mbuf *m) 2140 { 2141 struct bridge_iflist *dbif; 2142 struct ifnet *src_if, *dst_if, *ifp; 2143 struct ether_header *eh; 2144 uint16_t vlan; 2145 uint8_t *dst; 2146 int error; 2147 2148 src_if = m->m_pkthdr.rcvif; 2149 ifp = sc->sc_ifp; 2150 2151 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2152 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2153 vlan = VLANTAGOF(m); 2154 2155 if ((sbif->bif_flags & IFBIF_STP) && 2156 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2157 goto drop; 2158 2159 eh = mtod(m, struct ether_header *); 2160 dst = eh->ether_dhost; 2161 2162 /* If the interface is learning, record the address. */ 2163 if (sbif->bif_flags & IFBIF_LEARNING) { 2164 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2165 sbif, 0, IFBAF_DYNAMIC); 2166 /* 2167 * If the interface has addresses limits then deny any source 2168 * that is not in the cache. 2169 */ 2170 if (error && sbif->bif_addrmax) 2171 goto drop; 2172 } 2173 2174 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2175 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2176 goto drop; 2177 2178 /* 2179 * At this point, the port either doesn't participate 2180 * in spanning tree or it is in the forwarding state. 2181 */ 2182 2183 /* 2184 * If the packet is unicast, destined for someone on 2185 * "this" side of the bridge, drop it. 2186 */ 2187 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2188 dst_if = bridge_rtlookup(sc, dst, vlan); 2189 if (src_if == dst_if) 2190 goto drop; 2191 } else { 2192 /* 2193 * Check if its a reserved multicast address, any address 2194 * listed in 802.1D section 7.12.6 may not be forwarded by the 2195 * bridge. 2196 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2197 */ 2198 if (dst[0] == 0x01 && dst[1] == 0x80 && 2199 dst[2] == 0xc2 && dst[3] == 0x00 && 2200 dst[4] == 0x00 && dst[5] <= 0x0f) 2201 goto drop; 2202 2203 /* ...forward it to all interfaces. */ 2204 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2205 dst_if = NULL; 2206 } 2207 2208 /* 2209 * If we have a destination interface which is a member of our bridge, 2210 * OR this is a unicast packet, push it through the bpf(4) machinery. 2211 * For broadcast or multicast packets, don't bother because it will 2212 * be reinjected into ether_input. We do this before we pass the packets 2213 * through the pfil(9) framework, as it is possible that pfil(9) will 2214 * drop the packet, or possibly modify it, making it difficult to debug 2215 * firewall issues on the bridge. 2216 */ 2217 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2218 ETHER_BPF_MTAP(ifp, m); 2219 2220 /* run the packet filter */ 2221 if (PFIL_HOOKED(&V_inet_pfil_hook) 2222 #ifdef INET6 2223 || PFIL_HOOKED(&V_inet6_pfil_hook) 2224 #endif 2225 ) { 2226 BRIDGE_UNLOCK(sc); 2227 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2228 return; 2229 if (m == NULL) 2230 return; 2231 BRIDGE_LOCK(sc); 2232 } 2233 2234 if (dst_if == NULL) { 2235 bridge_broadcast(sc, src_if, m, 1); 2236 return; 2237 } 2238 2239 /* 2240 * At this point, we're dealing with a unicast frame 2241 * going to a different interface. 2242 */ 2243 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2244 goto drop; 2245 2246 dbif = bridge_lookup_member_if(sc, dst_if); 2247 if (dbif == NULL) 2248 /* Not a member of the bridge (anymore?) */ 2249 goto drop; 2250 2251 /* Private segments can not talk to each other */ 2252 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2253 goto drop; 2254 2255 if ((dbif->bif_flags & IFBIF_STP) && 2256 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2257 goto drop; 2258 2259 BRIDGE_UNLOCK(sc); 2260 2261 if (PFIL_HOOKED(&V_inet_pfil_hook) 2262 #ifdef INET6 2263 || PFIL_HOOKED(&V_inet6_pfil_hook) 2264 #endif 2265 ) { 2266 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2267 return; 2268 if (m == NULL) 2269 return; 2270 } 2271 2272 bridge_enqueue(sc, dst_if, m); 2273 return; 2274 2275 drop: 2276 BRIDGE_UNLOCK(sc); 2277 m_freem(m); 2278 } 2279 2280 /* 2281 * bridge_input: 2282 * 2283 * Receive input from a member interface. Queue the packet for 2284 * bridging if it is not for us. 2285 */ 2286 static struct mbuf * 2287 bridge_input(struct ifnet *ifp, struct mbuf *m) 2288 { 2289 struct bridge_softc *sc = ifp->if_bridge; 2290 struct bridge_iflist *bif, *bif2; 2291 struct ifnet *bifp; 2292 struct ether_header *eh; 2293 struct mbuf *mc, *mc2; 2294 uint16_t vlan; 2295 int error; 2296 2297 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2298 return (m); 2299 2300 bifp = sc->sc_ifp; 2301 vlan = VLANTAGOF(m); 2302 2303 /* 2304 * Implement support for bridge monitoring. If this flag has been 2305 * set on this interface, discard the packet once we push it through 2306 * the bpf(4) machinery, but before we do, increment the byte and 2307 * packet counters associated with this interface. 2308 */ 2309 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2310 m->m_pkthdr.rcvif = bifp; 2311 ETHER_BPF_MTAP(bifp, m); 2312 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2313 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2314 m_freem(m); 2315 return (NULL); 2316 } 2317 BRIDGE_LOCK(sc); 2318 bif = bridge_lookup_member_if(sc, ifp); 2319 if (bif == NULL) { 2320 BRIDGE_UNLOCK(sc); 2321 return (m); 2322 } 2323 2324 eh = mtod(m, struct ether_header *); 2325 2326 bridge_span(sc, m); 2327 2328 if (m->m_flags & (M_BCAST|M_MCAST)) { 2329 /* Tap off 802.1D packets; they do not get forwarded. */ 2330 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2331 ETHER_ADDR_LEN) == 0) { 2332 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2333 BRIDGE_UNLOCK(sc); 2334 return (NULL); 2335 } 2336 2337 if ((bif->bif_flags & IFBIF_STP) && 2338 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2339 BRIDGE_UNLOCK(sc); 2340 return (m); 2341 } 2342 2343 /* 2344 * Make a deep copy of the packet and enqueue the copy 2345 * for bridge processing; return the original packet for 2346 * local processing. 2347 */ 2348 mc = m_dup(m, M_NOWAIT); 2349 if (mc == NULL) { 2350 BRIDGE_UNLOCK(sc); 2351 return (m); 2352 } 2353 2354 /* Perform the bridge forwarding function with the copy. */ 2355 bridge_forward(sc, bif, mc); 2356 2357 /* 2358 * Reinject the mbuf as arriving on the bridge so we have a 2359 * chance at claiming multicast packets. We can not loop back 2360 * here from ether_input as a bridge is never a member of a 2361 * bridge. 2362 */ 2363 KASSERT(bifp->if_bridge == NULL, 2364 ("loop created in bridge_input")); 2365 mc2 = m_dup(m, M_NOWAIT); 2366 if (mc2 != NULL) { 2367 /* Keep the layer3 header aligned */ 2368 int i = min(mc2->m_pkthdr.len, max_protohdr); 2369 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2370 } 2371 if (mc2 != NULL) { 2372 mc2->m_pkthdr.rcvif = bifp; 2373 (*bifp->if_input)(bifp, mc2); 2374 } 2375 2376 /* Return the original packet for local processing. */ 2377 return (m); 2378 } 2379 2380 if ((bif->bif_flags & IFBIF_STP) && 2381 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2382 BRIDGE_UNLOCK(sc); 2383 return (m); 2384 } 2385 2386 #if (defined(INET) || defined(INET6)) 2387 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2388 || ((iface)->if_carp \ 2389 && (*carp_forus_p)((iface), eh->ether_dhost)) 2390 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2391 || ((iface)->if_carp \ 2392 && (*carp_forus_p)((iface), eh->ether_shost)) 2393 #else 2394 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2395 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2396 #endif 2397 2398 #ifdef INET6 2399 # define OR_PFIL_HOOKED_INET6 \ 2400 || PFIL_HOOKED(&V_inet6_pfil_hook) 2401 #else 2402 # define OR_PFIL_HOOKED_INET6 2403 #endif 2404 2405 #define GRAB_OUR_PACKETS(iface) \ 2406 if ((iface)->if_type == IFT_GIF) \ 2407 continue; \ 2408 /* It is destined for us. */ \ 2409 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2410 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2411 ) { \ 2412 if ((iface)->if_type == IFT_BRIDGE) { \ 2413 ETHER_BPF_MTAP(iface, m); \ 2414 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \ 2415 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2416 /* Filter on the physical interface. */ \ 2417 if (V_pfil_local_phys && \ 2418 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2419 OR_PFIL_HOOKED_INET6)) { \ 2420 if (bridge_pfil(&m, NULL, ifp, \ 2421 PFIL_IN) != 0 || m == NULL) { \ 2422 BRIDGE_UNLOCK(sc); \ 2423 return (NULL); \ 2424 } \ 2425 eh = mtod(m, struct ether_header *); \ 2426 } \ 2427 } \ 2428 if (bif->bif_flags & IFBIF_LEARNING) { \ 2429 error = bridge_rtupdate(sc, eh->ether_shost, \ 2430 vlan, bif, 0, IFBAF_DYNAMIC); \ 2431 if (error && bif->bif_addrmax) { \ 2432 BRIDGE_UNLOCK(sc); \ 2433 m_freem(m); \ 2434 return (NULL); \ 2435 } \ 2436 } \ 2437 m->m_pkthdr.rcvif = iface; \ 2438 BRIDGE_UNLOCK(sc); \ 2439 return (m); \ 2440 } \ 2441 \ 2442 /* We just received a packet that we sent out. */ \ 2443 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2444 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2445 ) { \ 2446 BRIDGE_UNLOCK(sc); \ 2447 m_freem(m); \ 2448 return (NULL); \ 2449 } 2450 2451 /* 2452 * Unicast. Make sure it's not for the bridge. 2453 */ 2454 do { GRAB_OUR_PACKETS(bifp) } while (0); 2455 2456 /* 2457 * Give a chance for ifp at first priority. This will help when the 2458 * packet comes through the interface like VLAN's with the same MACs 2459 * on several interfaces from the same bridge. This also will save 2460 * some CPU cycles in case the destination interface and the input 2461 * interface (eq ifp) are the same. 2462 */ 2463 do { GRAB_OUR_PACKETS(ifp) } while (0); 2464 2465 /* Now check the all bridge members. */ 2466 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2467 GRAB_OUR_PACKETS(bif2->bif_ifp) 2468 } 2469 2470 #undef OR_CARP_CHECK_WE_ARE_DST 2471 #undef OR_CARP_CHECK_WE_ARE_SRC 2472 #undef OR_PFIL_HOOKED_INET6 2473 #undef GRAB_OUR_PACKETS 2474 2475 /* Perform the bridge forwarding function. */ 2476 bridge_forward(sc, bif, m); 2477 2478 return (NULL); 2479 } 2480 2481 /* 2482 * bridge_broadcast: 2483 * 2484 * Send a frame to all interfaces that are members of 2485 * the bridge, except for the one on which the packet 2486 * arrived. 2487 * 2488 * NOTE: Releases the lock on return. 2489 */ 2490 static void 2491 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2492 struct mbuf *m, int runfilt) 2493 { 2494 struct bridge_iflist *dbif, *sbif; 2495 struct mbuf *mc; 2496 struct ifnet *dst_if; 2497 int error = 0, used = 0, i; 2498 2499 sbif = bridge_lookup_member_if(sc, src_if); 2500 2501 BRIDGE_LOCK2REF(sc, error); 2502 if (error) { 2503 m_freem(m); 2504 return; 2505 } 2506 2507 /* Filter on the bridge interface before broadcasting */ 2508 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2509 #ifdef INET6 2510 || PFIL_HOOKED(&V_inet6_pfil_hook) 2511 #endif 2512 )) { 2513 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2514 goto out; 2515 if (m == NULL) 2516 goto out; 2517 } 2518 2519 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2520 dst_if = dbif->bif_ifp; 2521 if (dst_if == src_if) 2522 continue; 2523 2524 /* Private segments can not talk to each other */ 2525 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2526 continue; 2527 2528 if ((dbif->bif_flags & IFBIF_STP) && 2529 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2530 continue; 2531 2532 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2533 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2534 continue; 2535 2536 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2537 continue; 2538 2539 if (LIST_NEXT(dbif, bif_next) == NULL) { 2540 mc = m; 2541 used = 1; 2542 } else { 2543 mc = m_dup(m, M_NOWAIT); 2544 if (mc == NULL) { 2545 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2546 continue; 2547 } 2548 } 2549 2550 /* 2551 * Filter on the output interface. Pass a NULL bridge interface 2552 * pointer so we do not redundantly filter on the bridge for 2553 * each interface we broadcast on. 2554 */ 2555 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2556 #ifdef INET6 2557 || PFIL_HOOKED(&V_inet6_pfil_hook) 2558 #endif 2559 )) { 2560 if (used == 0) { 2561 /* Keep the layer3 header aligned */ 2562 i = min(mc->m_pkthdr.len, max_protohdr); 2563 mc = m_copyup(mc, i, ETHER_ALIGN); 2564 if (mc == NULL) { 2565 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2566 continue; 2567 } 2568 } 2569 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2570 continue; 2571 if (mc == NULL) 2572 continue; 2573 } 2574 2575 bridge_enqueue(sc, dst_if, mc); 2576 } 2577 if (used == 0) 2578 m_freem(m); 2579 2580 out: 2581 BRIDGE_UNREF(sc); 2582 } 2583 2584 /* 2585 * bridge_span: 2586 * 2587 * Duplicate a packet out one or more interfaces that are in span mode, 2588 * the original mbuf is unmodified. 2589 */ 2590 static void 2591 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2592 { 2593 struct bridge_iflist *bif; 2594 struct ifnet *dst_if; 2595 struct mbuf *mc; 2596 2597 if (LIST_EMPTY(&sc->sc_spanlist)) 2598 return; 2599 2600 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2601 dst_if = bif->bif_ifp; 2602 2603 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2604 continue; 2605 2606 mc = m_copypacket(m, M_NOWAIT); 2607 if (mc == NULL) { 2608 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2609 continue; 2610 } 2611 2612 bridge_enqueue(sc, dst_if, mc); 2613 } 2614 } 2615 2616 /* 2617 * bridge_rtupdate: 2618 * 2619 * Add a bridge routing entry. 2620 */ 2621 static int 2622 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2623 struct bridge_iflist *bif, int setflags, uint8_t flags) 2624 { 2625 struct bridge_rtnode *brt; 2626 int error; 2627 2628 BRIDGE_LOCK_ASSERT(sc); 2629 2630 /* Check the source address is valid and not multicast. */ 2631 if (ETHER_IS_MULTICAST(dst) || 2632 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2633 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2634 return (EINVAL); 2635 2636 /* 802.1p frames map to vlan 1 */ 2637 if (vlan == 0) 2638 vlan = 1; 2639 2640 /* 2641 * A route for this destination might already exist. If so, 2642 * update it, otherwise create a new one. 2643 */ 2644 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2645 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2646 sc->sc_brtexceeded++; 2647 return (ENOSPC); 2648 } 2649 /* Check per interface address limits (if enabled) */ 2650 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2651 bif->bif_addrexceeded++; 2652 return (ENOSPC); 2653 } 2654 2655 /* 2656 * Allocate a new bridge forwarding node, and 2657 * initialize the expiration time and Ethernet 2658 * address. 2659 */ 2660 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2661 if (brt == NULL) 2662 return (ENOMEM); 2663 2664 if (bif->bif_flags & IFBIF_STICKY) 2665 brt->brt_flags = IFBAF_STICKY; 2666 else 2667 brt->brt_flags = IFBAF_DYNAMIC; 2668 2669 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2670 brt->brt_vlan = vlan; 2671 2672 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2673 uma_zfree(bridge_rtnode_zone, brt); 2674 return (error); 2675 } 2676 brt->brt_dst = bif; 2677 bif->bif_addrcnt++; 2678 } 2679 2680 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2681 brt->brt_dst != bif) { 2682 brt->brt_dst->bif_addrcnt--; 2683 brt->brt_dst = bif; 2684 brt->brt_dst->bif_addrcnt++; 2685 } 2686 2687 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2688 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2689 if (setflags) 2690 brt->brt_flags = flags; 2691 2692 return (0); 2693 } 2694 2695 /* 2696 * bridge_rtlookup: 2697 * 2698 * Lookup the destination interface for an address. 2699 */ 2700 static struct ifnet * 2701 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2702 { 2703 struct bridge_rtnode *brt; 2704 2705 BRIDGE_LOCK_ASSERT(sc); 2706 2707 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2708 return (NULL); 2709 2710 return (brt->brt_ifp); 2711 } 2712 2713 /* 2714 * bridge_rttrim: 2715 * 2716 * Trim the routine table so that we have a number 2717 * of routing entries less than or equal to the 2718 * maximum number. 2719 */ 2720 static void 2721 bridge_rttrim(struct bridge_softc *sc) 2722 { 2723 struct bridge_rtnode *brt, *nbrt; 2724 2725 BRIDGE_LOCK_ASSERT(sc); 2726 2727 /* Make sure we actually need to do this. */ 2728 if (sc->sc_brtcnt <= sc->sc_brtmax) 2729 return; 2730 2731 /* Force an aging cycle; this might trim enough addresses. */ 2732 bridge_rtage(sc); 2733 if (sc->sc_brtcnt <= sc->sc_brtmax) 2734 return; 2735 2736 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2737 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2738 bridge_rtnode_destroy(sc, brt); 2739 if (sc->sc_brtcnt <= sc->sc_brtmax) 2740 return; 2741 } 2742 } 2743 } 2744 2745 /* 2746 * bridge_timer: 2747 * 2748 * Aging timer for the bridge. 2749 */ 2750 static void 2751 bridge_timer(void *arg) 2752 { 2753 struct bridge_softc *sc = arg; 2754 2755 BRIDGE_LOCK_ASSERT(sc); 2756 2757 bridge_rtage(sc); 2758 2759 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2760 callout_reset(&sc->sc_brcallout, 2761 bridge_rtable_prune_period * hz, bridge_timer, sc); 2762 } 2763 2764 /* 2765 * bridge_rtage: 2766 * 2767 * Perform an aging cycle. 2768 */ 2769 static void 2770 bridge_rtage(struct bridge_softc *sc) 2771 { 2772 struct bridge_rtnode *brt, *nbrt; 2773 2774 BRIDGE_LOCK_ASSERT(sc); 2775 2776 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2777 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2778 if (time_uptime >= brt->brt_expire) 2779 bridge_rtnode_destroy(sc, brt); 2780 } 2781 } 2782 } 2783 2784 /* 2785 * bridge_rtflush: 2786 * 2787 * Remove all dynamic addresses from the bridge. 2788 */ 2789 static void 2790 bridge_rtflush(struct bridge_softc *sc, int full) 2791 { 2792 struct bridge_rtnode *brt, *nbrt; 2793 2794 BRIDGE_LOCK_ASSERT(sc); 2795 2796 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2797 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2798 bridge_rtnode_destroy(sc, brt); 2799 } 2800 } 2801 2802 /* 2803 * bridge_rtdaddr: 2804 * 2805 * Remove an address from the table. 2806 */ 2807 static int 2808 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2809 { 2810 struct bridge_rtnode *brt; 2811 int found = 0; 2812 2813 BRIDGE_LOCK_ASSERT(sc); 2814 2815 /* 2816 * If vlan is zero then we want to delete for all vlans so the lookup 2817 * may return more than one. 2818 */ 2819 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2820 bridge_rtnode_destroy(sc, brt); 2821 found = 1; 2822 } 2823 2824 return (found ? 0 : ENOENT); 2825 } 2826 2827 /* 2828 * bridge_rtdelete: 2829 * 2830 * Delete routes to a speicifc member interface. 2831 */ 2832 static void 2833 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2834 { 2835 struct bridge_rtnode *brt, *nbrt; 2836 2837 BRIDGE_LOCK_ASSERT(sc); 2838 2839 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2840 if (brt->brt_ifp == ifp && (full || 2841 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2842 bridge_rtnode_destroy(sc, brt); 2843 } 2844 } 2845 2846 /* 2847 * bridge_rtable_init: 2848 * 2849 * Initialize the route table for this bridge. 2850 */ 2851 static void 2852 bridge_rtable_init(struct bridge_softc *sc) 2853 { 2854 int i; 2855 2856 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2857 M_DEVBUF, M_WAITOK); 2858 2859 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2860 LIST_INIT(&sc->sc_rthash[i]); 2861 2862 sc->sc_rthash_key = arc4random(); 2863 LIST_INIT(&sc->sc_rtlist); 2864 } 2865 2866 /* 2867 * bridge_rtable_fini: 2868 * 2869 * Deconstruct the route table for this bridge. 2870 */ 2871 static void 2872 bridge_rtable_fini(struct bridge_softc *sc) 2873 { 2874 2875 KASSERT(sc->sc_brtcnt == 0, 2876 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2877 free(sc->sc_rthash, M_DEVBUF); 2878 } 2879 2880 /* 2881 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2882 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2883 */ 2884 #define mix(a, b, c) \ 2885 do { \ 2886 a -= b; a -= c; a ^= (c >> 13); \ 2887 b -= c; b -= a; b ^= (a << 8); \ 2888 c -= a; c -= b; c ^= (b >> 13); \ 2889 a -= b; a -= c; a ^= (c >> 12); \ 2890 b -= c; b -= a; b ^= (a << 16); \ 2891 c -= a; c -= b; c ^= (b >> 5); \ 2892 a -= b; a -= c; a ^= (c >> 3); \ 2893 b -= c; b -= a; b ^= (a << 10); \ 2894 c -= a; c -= b; c ^= (b >> 15); \ 2895 } while (/*CONSTCOND*/0) 2896 2897 static __inline uint32_t 2898 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2899 { 2900 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2901 2902 b += addr[5] << 8; 2903 b += addr[4]; 2904 a += addr[3] << 24; 2905 a += addr[2] << 16; 2906 a += addr[1] << 8; 2907 a += addr[0]; 2908 2909 mix(a, b, c); 2910 2911 return (c & BRIDGE_RTHASH_MASK); 2912 } 2913 2914 #undef mix 2915 2916 static int 2917 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2918 { 2919 int i, d; 2920 2921 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2922 d = ((int)a[i]) - ((int)b[i]); 2923 } 2924 2925 return (d); 2926 } 2927 2928 /* 2929 * bridge_rtnode_lookup: 2930 * 2931 * Look up a bridge route node for the specified destination. Compare the 2932 * vlan id or if zero then just return the first match. 2933 */ 2934 static struct bridge_rtnode * 2935 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2936 { 2937 struct bridge_rtnode *brt; 2938 uint32_t hash; 2939 int dir; 2940 2941 BRIDGE_LOCK_ASSERT(sc); 2942 2943 hash = bridge_rthash(sc, addr); 2944 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2945 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2946 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2947 return (brt); 2948 if (dir > 0) 2949 return (NULL); 2950 } 2951 2952 return (NULL); 2953 } 2954 2955 /* 2956 * bridge_rtnode_insert: 2957 * 2958 * Insert the specified bridge node into the route table. We 2959 * assume the entry is not already in the table. 2960 */ 2961 static int 2962 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2963 { 2964 struct bridge_rtnode *lbrt; 2965 uint32_t hash; 2966 int dir; 2967 2968 BRIDGE_LOCK_ASSERT(sc); 2969 2970 hash = bridge_rthash(sc, brt->brt_addr); 2971 2972 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2973 if (lbrt == NULL) { 2974 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2975 goto out; 2976 } 2977 2978 do { 2979 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2980 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2981 return (EEXIST); 2982 if (dir > 0) { 2983 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2984 goto out; 2985 } 2986 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2987 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2988 goto out; 2989 } 2990 lbrt = LIST_NEXT(lbrt, brt_hash); 2991 } while (lbrt != NULL); 2992 2993 #ifdef DIAGNOSTIC 2994 panic("bridge_rtnode_insert: impossible"); 2995 #endif 2996 2997 out: 2998 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2999 sc->sc_brtcnt++; 3000 3001 return (0); 3002 } 3003 3004 /* 3005 * bridge_rtnode_destroy: 3006 * 3007 * Destroy a bridge rtnode. 3008 */ 3009 static void 3010 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3011 { 3012 BRIDGE_LOCK_ASSERT(sc); 3013 3014 LIST_REMOVE(brt, brt_hash); 3015 3016 LIST_REMOVE(brt, brt_list); 3017 sc->sc_brtcnt--; 3018 brt->brt_dst->bif_addrcnt--; 3019 uma_zfree(bridge_rtnode_zone, brt); 3020 } 3021 3022 /* 3023 * bridge_rtable_expire: 3024 * 3025 * Set the expiry time for all routes on an interface. 3026 */ 3027 static void 3028 bridge_rtable_expire(struct ifnet *ifp, int age) 3029 { 3030 struct bridge_softc *sc = ifp->if_bridge; 3031 struct bridge_rtnode *brt; 3032 3033 BRIDGE_LOCK(sc); 3034 3035 /* 3036 * If the age is zero then flush, otherwise set all the expiry times to 3037 * age for the interface 3038 */ 3039 if (age == 0) 3040 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3041 else { 3042 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3043 /* Cap the expiry time to 'age' */ 3044 if (brt->brt_ifp == ifp && 3045 brt->brt_expire > time_uptime + age && 3046 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3047 brt->brt_expire = time_uptime + age; 3048 } 3049 } 3050 BRIDGE_UNLOCK(sc); 3051 } 3052 3053 /* 3054 * bridge_state_change: 3055 * 3056 * Callback from the bridgestp code when a port changes states. 3057 */ 3058 static void 3059 bridge_state_change(struct ifnet *ifp, int state) 3060 { 3061 struct bridge_softc *sc = ifp->if_bridge; 3062 static const char *stpstates[] = { 3063 "disabled", 3064 "listening", 3065 "learning", 3066 "forwarding", 3067 "blocking", 3068 "discarding" 3069 }; 3070 3071 CURVNET_SET(ifp->if_vnet); 3072 if (V_log_stp) 3073 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3074 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3075 CURVNET_RESTORE(); 3076 } 3077 3078 /* 3079 * Send bridge packets through pfil if they are one of the types pfil can deal 3080 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3081 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3082 * that interface. 3083 */ 3084 static int 3085 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3086 { 3087 int snap, error, i, hlen; 3088 struct ether_header *eh1, eh2; 3089 struct ip *ip; 3090 struct llc llc1; 3091 u_int16_t ether_type; 3092 3093 snap = 0; 3094 error = -1; /* Default error if not error == 0 */ 3095 3096 #if 0 3097 /* we may return with the IP fields swapped, ensure its not shared */ 3098 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3099 #endif 3100 3101 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3102 return (0); /* filtering is disabled */ 3103 3104 i = min((*mp)->m_pkthdr.len, max_protohdr); 3105 if ((*mp)->m_len < i) { 3106 *mp = m_pullup(*mp, i); 3107 if (*mp == NULL) { 3108 printf("%s: m_pullup failed\n", __func__); 3109 return (-1); 3110 } 3111 } 3112 3113 eh1 = mtod(*mp, struct ether_header *); 3114 ether_type = ntohs(eh1->ether_type); 3115 3116 /* 3117 * Check for SNAP/LLC. 3118 */ 3119 if (ether_type < ETHERMTU) { 3120 struct llc *llc2 = (struct llc *)(eh1 + 1); 3121 3122 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3123 llc2->llc_dsap == LLC_SNAP_LSAP && 3124 llc2->llc_ssap == LLC_SNAP_LSAP && 3125 llc2->llc_control == LLC_UI) { 3126 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3127 snap = 1; 3128 } 3129 } 3130 3131 /* 3132 * If we're trying to filter bridge traffic, don't look at anything 3133 * other than IP and ARP traffic. If the filter doesn't understand 3134 * IPv6, don't allow IPv6 through the bridge either. This is lame 3135 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3136 * but of course we don't have an AppleTalk filter to begin with. 3137 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3138 * ARP traffic.) 3139 */ 3140 switch (ether_type) { 3141 case ETHERTYPE_ARP: 3142 case ETHERTYPE_REVARP: 3143 if (V_pfil_ipfw_arp == 0) 3144 return (0); /* Automatically pass */ 3145 break; 3146 3147 case ETHERTYPE_IP: 3148 #ifdef INET6 3149 case ETHERTYPE_IPV6: 3150 #endif /* INET6 */ 3151 break; 3152 default: 3153 /* 3154 * Check to see if the user wants to pass non-ip 3155 * packets, these will not be checked by pfil(9) and 3156 * passed unconditionally so the default is to drop. 3157 */ 3158 if (V_pfil_onlyip) 3159 goto bad; 3160 } 3161 3162 /* Run the packet through pfil before stripping link headers */ 3163 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 && 3164 dir == PFIL_OUT && ifp != NULL) { 3165 3166 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3167 3168 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3169 return (error); 3170 } 3171 3172 /* Strip off the Ethernet header and keep a copy. */ 3173 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3174 m_adj(*mp, ETHER_HDR_LEN); 3175 3176 /* Strip off snap header, if present */ 3177 if (snap) { 3178 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3179 m_adj(*mp, sizeof(struct llc)); 3180 } 3181 3182 /* 3183 * Check the IP header for alignment and errors 3184 */ 3185 if (dir == PFIL_IN) { 3186 switch (ether_type) { 3187 case ETHERTYPE_IP: 3188 error = bridge_ip_checkbasic(mp); 3189 break; 3190 #ifdef INET6 3191 case ETHERTYPE_IPV6: 3192 error = bridge_ip6_checkbasic(mp); 3193 break; 3194 #endif /* INET6 */ 3195 default: 3196 error = 0; 3197 } 3198 if (error) 3199 goto bad; 3200 } 3201 3202 error = 0; 3203 3204 /* 3205 * Run the packet through pfil 3206 */ 3207 switch (ether_type) { 3208 case ETHERTYPE_IP: 3209 /* 3210 * Run pfil on the member interface and the bridge, both can 3211 * be skipped by clearing pfil_member or pfil_bridge. 3212 * 3213 * Keep the order: 3214 * in_if -> bridge_if -> out_if 3215 */ 3216 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3217 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3218 dir, NULL); 3219 3220 if (*mp == NULL || error != 0) /* filter may consume */ 3221 break; 3222 3223 if (V_pfil_member && ifp != NULL) 3224 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3225 dir, NULL); 3226 3227 if (*mp == NULL || error != 0) /* filter may consume */ 3228 break; 3229 3230 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3231 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3232 dir, NULL); 3233 3234 if (*mp == NULL || error != 0) /* filter may consume */ 3235 break; 3236 3237 /* check if we need to fragment the packet */ 3238 /* bridge_fragment generates a mbuf chain of packets */ 3239 /* that already include eth headers */ 3240 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3241 i = (*mp)->m_pkthdr.len; 3242 if (i > ifp->if_mtu) { 3243 error = bridge_fragment(ifp, mp, &eh2, snap, 3244 &llc1); 3245 return (error); 3246 } 3247 } 3248 3249 /* Recalculate the ip checksum. */ 3250 ip = mtod(*mp, struct ip *); 3251 hlen = ip->ip_hl << 2; 3252 if (hlen < sizeof(struct ip)) 3253 goto bad; 3254 if (hlen > (*mp)->m_len) { 3255 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3256 goto bad; 3257 ip = mtod(*mp, struct ip *); 3258 if (ip == NULL) 3259 goto bad; 3260 } 3261 ip->ip_sum = 0; 3262 if (hlen == sizeof(struct ip)) 3263 ip->ip_sum = in_cksum_hdr(ip); 3264 else 3265 ip->ip_sum = in_cksum(*mp, hlen); 3266 3267 break; 3268 #ifdef INET6 3269 case ETHERTYPE_IPV6: 3270 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3271 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3272 dir, NULL); 3273 3274 if (*mp == NULL || error != 0) /* filter may consume */ 3275 break; 3276 3277 if (V_pfil_member && ifp != NULL) 3278 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3279 dir, NULL); 3280 3281 if (*mp == NULL || error != 0) /* filter may consume */ 3282 break; 3283 3284 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3285 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3286 dir, NULL); 3287 break; 3288 #endif 3289 default: 3290 error = 0; 3291 break; 3292 } 3293 3294 if (*mp == NULL) 3295 return (error); 3296 if (error != 0) 3297 goto bad; 3298 3299 error = -1; 3300 3301 /* 3302 * Finally, put everything back the way it was and return 3303 */ 3304 if (snap) { 3305 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3306 if (*mp == NULL) 3307 return (error); 3308 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3309 } 3310 3311 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3312 if (*mp == NULL) 3313 return (error); 3314 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3315 3316 return (0); 3317 3318 bad: 3319 m_freem(*mp); 3320 *mp = NULL; 3321 return (error); 3322 } 3323 3324 /* 3325 * Perform basic checks on header size since 3326 * pfil assumes ip_input has already processed 3327 * it for it. Cut-and-pasted from ip_input.c. 3328 * Given how simple the IPv6 version is, 3329 * does the IPv4 version really need to be 3330 * this complicated? 3331 * 3332 * XXX Should we update ipstat here, or not? 3333 * XXX Right now we update ipstat but not 3334 * XXX csum_counter. 3335 */ 3336 static int 3337 bridge_ip_checkbasic(struct mbuf **mp) 3338 { 3339 struct mbuf *m = *mp; 3340 struct ip *ip; 3341 int len, hlen; 3342 u_short sum; 3343 3344 if (*mp == NULL) 3345 return (-1); 3346 3347 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3348 if ((m = m_copyup(m, sizeof(struct ip), 3349 (max_linkhdr + 3) & ~3)) == NULL) { 3350 /* XXXJRT new stat, please */ 3351 KMOD_IPSTAT_INC(ips_toosmall); 3352 goto bad; 3353 } 3354 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3355 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3356 KMOD_IPSTAT_INC(ips_toosmall); 3357 goto bad; 3358 } 3359 } 3360 ip = mtod(m, struct ip *); 3361 if (ip == NULL) goto bad; 3362 3363 if (ip->ip_v != IPVERSION) { 3364 KMOD_IPSTAT_INC(ips_badvers); 3365 goto bad; 3366 } 3367 hlen = ip->ip_hl << 2; 3368 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3369 KMOD_IPSTAT_INC(ips_badhlen); 3370 goto bad; 3371 } 3372 if (hlen > m->m_len) { 3373 if ((m = m_pullup(m, hlen)) == NULL) { 3374 KMOD_IPSTAT_INC(ips_badhlen); 3375 goto bad; 3376 } 3377 ip = mtod(m, struct ip *); 3378 if (ip == NULL) goto bad; 3379 } 3380 3381 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3382 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3383 } else { 3384 if (hlen == sizeof(struct ip)) { 3385 sum = in_cksum_hdr(ip); 3386 } else { 3387 sum = in_cksum(m, hlen); 3388 } 3389 } 3390 if (sum) { 3391 KMOD_IPSTAT_INC(ips_badsum); 3392 goto bad; 3393 } 3394 3395 /* Retrieve the packet length. */ 3396 len = ntohs(ip->ip_len); 3397 3398 /* 3399 * Check for additional length bogosity 3400 */ 3401 if (len < hlen) { 3402 KMOD_IPSTAT_INC(ips_badlen); 3403 goto bad; 3404 } 3405 3406 /* 3407 * Check that the amount of data in the buffers 3408 * is as at least much as the IP header would have us expect. 3409 * Drop packet if shorter than we expect. 3410 */ 3411 if (m->m_pkthdr.len < len) { 3412 KMOD_IPSTAT_INC(ips_tooshort); 3413 goto bad; 3414 } 3415 3416 /* Checks out, proceed */ 3417 *mp = m; 3418 return (0); 3419 3420 bad: 3421 *mp = m; 3422 return (-1); 3423 } 3424 3425 #ifdef INET6 3426 /* 3427 * Same as above, but for IPv6. 3428 * Cut-and-pasted from ip6_input.c. 3429 * XXX Should we update ip6stat, or not? 3430 */ 3431 static int 3432 bridge_ip6_checkbasic(struct mbuf **mp) 3433 { 3434 struct mbuf *m = *mp; 3435 struct ip6_hdr *ip6; 3436 3437 /* 3438 * If the IPv6 header is not aligned, slurp it up into a new 3439 * mbuf with space for link headers, in the event we forward 3440 * it. Otherwise, if it is aligned, make sure the entire base 3441 * IPv6 header is in the first mbuf of the chain. 3442 */ 3443 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3444 struct ifnet *inifp = m->m_pkthdr.rcvif; 3445 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3446 (max_linkhdr + 3) & ~3)) == NULL) { 3447 /* XXXJRT new stat, please */ 3448 IP6STAT_INC(ip6s_toosmall); 3449 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3450 goto bad; 3451 } 3452 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3453 struct ifnet *inifp = m->m_pkthdr.rcvif; 3454 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3455 IP6STAT_INC(ip6s_toosmall); 3456 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3457 goto bad; 3458 } 3459 } 3460 3461 ip6 = mtod(m, struct ip6_hdr *); 3462 3463 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3464 IP6STAT_INC(ip6s_badvers); 3465 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3466 goto bad; 3467 } 3468 3469 /* Checks out, proceed */ 3470 *mp = m; 3471 return (0); 3472 3473 bad: 3474 *mp = m; 3475 return (-1); 3476 } 3477 #endif /* INET6 */ 3478 3479 /* 3480 * bridge_fragment: 3481 * 3482 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3483 */ 3484 static int 3485 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3486 int snap, struct llc *llc) 3487 { 3488 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3489 struct ip *ip; 3490 int error = -1; 3491 3492 if (m->m_len < sizeof(struct ip) && 3493 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3494 goto dropit; 3495 ip = mtod(m, struct ip *); 3496 3497 m->m_pkthdr.csum_flags |= CSUM_IP; 3498 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3499 if (error) 3500 goto dropit; 3501 3502 /* 3503 * Walk the chain and re-add the Ethernet header for 3504 * each mbuf packet. 3505 */ 3506 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3507 nextpkt = mcur->m_nextpkt; 3508 mcur->m_nextpkt = NULL; 3509 if (snap) { 3510 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3511 if (mcur == NULL) { 3512 error = ENOBUFS; 3513 if (mprev != NULL) 3514 mprev->m_nextpkt = nextpkt; 3515 goto dropit; 3516 } 3517 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3518 } 3519 3520 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3521 if (mcur == NULL) { 3522 error = ENOBUFS; 3523 if (mprev != NULL) 3524 mprev->m_nextpkt = nextpkt; 3525 goto dropit; 3526 } 3527 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3528 3529 /* 3530 * The previous two M_PREPEND could have inserted one or two 3531 * mbufs in front so we have to update the previous packet's 3532 * m_nextpkt. 3533 */ 3534 mcur->m_nextpkt = nextpkt; 3535 if (mprev != NULL) 3536 mprev->m_nextpkt = mcur; 3537 else { 3538 /* The first mbuf in the original chain needs to be 3539 * updated. */ 3540 *mp = mcur; 3541 } 3542 mprev = mcur; 3543 } 3544 3545 KMOD_IPSTAT_INC(ips_fragmented); 3546 return (error); 3547 3548 dropit: 3549 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3550 m = mcur->m_nextpkt; 3551 m_freem(mcur); 3552 } 3553 return (error); 3554 } 3555 3556 static void 3557 bridge_linkstate(struct ifnet *ifp) 3558 { 3559 struct bridge_softc *sc = ifp->if_bridge; 3560 struct bridge_iflist *bif; 3561 3562 BRIDGE_LOCK(sc); 3563 bif = bridge_lookup_member_if(sc, ifp); 3564 if (bif == NULL) { 3565 BRIDGE_UNLOCK(sc); 3566 return; 3567 } 3568 bridge_linkcheck(sc); 3569 BRIDGE_UNLOCK(sc); 3570 3571 bstp_linkstate(&bif->bif_stp); 3572 } 3573 3574 static void 3575 bridge_linkcheck(struct bridge_softc *sc) 3576 { 3577 struct bridge_iflist *bif; 3578 int new_link, hasls; 3579 3580 BRIDGE_LOCK_ASSERT(sc); 3581 new_link = LINK_STATE_DOWN; 3582 hasls = 0; 3583 /* Our link is considered up if at least one of our ports is active */ 3584 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3585 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3586 hasls++; 3587 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3588 new_link = LINK_STATE_UP; 3589 break; 3590 } 3591 } 3592 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3593 /* If no interfaces support link-state then we default to up */ 3594 new_link = LINK_STATE_UP; 3595 } 3596 if_link_state_change(sc->sc_ifp, new_link); 3597 } 3598