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_VERSION(if_bridge, 1); 588 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 589 590 /* 591 * handler for net.link.bridge.ipfw 592 */ 593 static int 594 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 595 { 596 int enable = V_pfil_ipfw; 597 int error; 598 599 error = sysctl_handle_int(oidp, &enable, 0, req); 600 enable &= 1; 601 602 if (enable != V_pfil_ipfw) { 603 V_pfil_ipfw = enable; 604 605 /* 606 * Disable pfil so that ipfw doesnt run twice, if the user 607 * really wants both then they can re-enable pfil_bridge and/or 608 * pfil_member. Also allow non-ip packets as ipfw can filter by 609 * layer2 type. 610 */ 611 if (V_pfil_ipfw) { 612 V_pfil_onlyip = 0; 613 V_pfil_bridge = 0; 614 V_pfil_member = 0; 615 } 616 } 617 618 return (error); 619 } 620 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 621 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET, 622 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 623 "Layer2 filter with IPFW"); 624 625 /* 626 * bridge_clone_create: 627 * 628 * Create a new bridge instance. 629 */ 630 static int 631 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 632 { 633 struct bridge_softc *sc, *sc2; 634 struct ifnet *bifp, *ifp; 635 int fb, retry; 636 unsigned long hostid; 637 638 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 639 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 640 if (ifp == NULL) { 641 free(sc, M_DEVBUF); 642 return (ENOSPC); 643 } 644 645 BRIDGE_LOCK_INIT(sc); 646 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 647 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 648 649 /* Initialize our routing table. */ 650 bridge_rtable_init(sc); 651 652 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 653 654 LIST_INIT(&sc->sc_iflist); 655 LIST_INIT(&sc->sc_spanlist); 656 657 ifp->if_softc = sc; 658 if_initname(ifp, bridge_name, unit); 659 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 660 ifp->if_ioctl = bridge_ioctl; 661 ifp->if_transmit = bridge_transmit; 662 ifp->if_qflush = bridge_qflush; 663 ifp->if_init = bridge_init; 664 ifp->if_type = IFT_BRIDGE; 665 666 /* 667 * Generate an ethernet address with a locally administered address. 668 * 669 * Since we are using random ethernet addresses for the bridge, it is 670 * possible that we might have address collisions, so make sure that 671 * this hardware address isn't already in use on another bridge. 672 * The first try uses the hostid and falls back to arc4rand(). 673 */ 674 fb = 0; 675 getcredhostid(curthread->td_ucred, &hostid); 676 do { 677 if (fb || hostid == 0) { 678 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 679 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 680 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 681 } else { 682 sc->sc_defaddr[0] = 0x2; 683 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 684 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 685 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 686 sc->sc_defaddr[4] = hostid & 0xff; 687 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 688 } 689 690 fb = 1; 691 retry = 0; 692 BRIDGE_LIST_LOCK(); 693 LIST_FOREACH(sc2, &V_bridge_list, sc_list) { 694 bifp = sc2->sc_ifp; 695 if (memcmp(sc->sc_defaddr, 696 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 697 retry = 1; 698 break; 699 } 700 } 701 BRIDGE_LIST_UNLOCK(); 702 } while (retry == 1); 703 704 bstp_attach(&sc->sc_stp, &bridge_ops); 705 ether_ifattach(ifp, sc->sc_defaddr); 706 /* Now undo some of the damage... */ 707 ifp->if_baudrate = 0; 708 ifp->if_type = IFT_BRIDGE; 709 710 BRIDGE_LIST_LOCK(); 711 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 712 BRIDGE_LIST_UNLOCK(); 713 714 return (0); 715 } 716 717 /* 718 * bridge_clone_destroy: 719 * 720 * Destroy a bridge instance. 721 */ 722 static void 723 bridge_clone_destroy(struct ifnet *ifp) 724 { 725 struct bridge_softc *sc = ifp->if_softc; 726 struct bridge_iflist *bif; 727 728 BRIDGE_LOCK(sc); 729 730 bridge_stop(ifp, 1); 731 ifp->if_flags &= ~IFF_UP; 732 733 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 734 bridge_delete_member(sc, bif, 0); 735 736 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 737 bridge_delete_span(sc, bif); 738 } 739 740 BRIDGE_UNLOCK(sc); 741 742 callout_drain(&sc->sc_brcallout); 743 744 BRIDGE_LIST_LOCK(); 745 LIST_REMOVE(sc, sc_list); 746 BRIDGE_LIST_UNLOCK(); 747 748 bstp_detach(&sc->sc_stp); 749 ether_ifdetach(ifp); 750 if_free(ifp); 751 752 /* Tear down the routing table. */ 753 bridge_rtable_fini(sc); 754 755 BRIDGE_LOCK_DESTROY(sc); 756 free(sc, M_DEVBUF); 757 } 758 759 /* 760 * bridge_ioctl: 761 * 762 * Handle a control request from the operator. 763 */ 764 static int 765 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 766 { 767 struct bridge_softc *sc = ifp->if_softc; 768 struct ifreq *ifr = (struct ifreq *)data; 769 struct bridge_iflist *bif; 770 struct thread *td = curthread; 771 union { 772 struct ifbreq ifbreq; 773 struct ifbifconf ifbifconf; 774 struct ifbareq ifbareq; 775 struct ifbaconf ifbaconf; 776 struct ifbrparam ifbrparam; 777 struct ifbropreq ifbropreq; 778 } args; 779 struct ifdrv *ifd = (struct ifdrv *) data; 780 const struct bridge_control *bc; 781 int error = 0; 782 783 switch (cmd) { 784 785 case SIOCADDMULTI: 786 case SIOCDELMULTI: 787 break; 788 789 case SIOCGDRVSPEC: 790 case SIOCSDRVSPEC: 791 if (ifd->ifd_cmd >= bridge_control_table_size) { 792 error = EINVAL; 793 break; 794 } 795 bc = &bridge_control_table[ifd->ifd_cmd]; 796 797 if (cmd == SIOCGDRVSPEC && 798 (bc->bc_flags & BC_F_COPYOUT) == 0) { 799 error = EINVAL; 800 break; 801 } 802 else if (cmd == SIOCSDRVSPEC && 803 (bc->bc_flags & BC_F_COPYOUT) != 0) { 804 error = EINVAL; 805 break; 806 } 807 808 if (bc->bc_flags & BC_F_SUSER) { 809 error = priv_check(td, PRIV_NET_BRIDGE); 810 if (error) 811 break; 812 } 813 814 if (ifd->ifd_len != bc->bc_argsize || 815 ifd->ifd_len > sizeof(args)) { 816 error = EINVAL; 817 break; 818 } 819 820 bzero(&args, sizeof(args)); 821 if (bc->bc_flags & BC_F_COPYIN) { 822 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 823 if (error) 824 break; 825 } 826 827 BRIDGE_LOCK(sc); 828 error = (*bc->bc_func)(sc, &args); 829 BRIDGE_UNLOCK(sc); 830 if (error) 831 break; 832 833 if (bc->bc_flags & BC_F_COPYOUT) 834 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 835 836 break; 837 838 case SIOCSIFFLAGS: 839 if (!(ifp->if_flags & IFF_UP) && 840 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 841 /* 842 * If interface is marked down and it is running, 843 * then stop and disable it. 844 */ 845 BRIDGE_LOCK(sc); 846 bridge_stop(ifp, 1); 847 BRIDGE_UNLOCK(sc); 848 } else if ((ifp->if_flags & IFF_UP) && 849 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 850 /* 851 * If interface is marked up and it is stopped, then 852 * start it. 853 */ 854 (*ifp->if_init)(sc); 855 } 856 break; 857 858 case SIOCSIFMTU: 859 if (ifr->ifr_mtu < 576) { 860 error = EINVAL; 861 break; 862 } 863 if (LIST_EMPTY(&sc->sc_iflist)) { 864 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 865 break; 866 } 867 BRIDGE_LOCK(sc); 868 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 869 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 870 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 871 " != %d\n", sc->sc_ifp->if_xname, 872 bif->bif_ifp->if_mtu, 873 bif->bif_ifp->if_xname, ifr->ifr_mtu); 874 error = EINVAL; 875 break; 876 } 877 } 878 if (!error) 879 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 880 BRIDGE_UNLOCK(sc); 881 break; 882 default: 883 /* 884 * drop the lock as ether_ioctl() will call bridge_start() and 885 * cause the lock to be recursed. 886 */ 887 error = ether_ioctl(ifp, cmd, data); 888 break; 889 } 890 891 return (error); 892 } 893 894 /* 895 * bridge_mutecaps: 896 * 897 * Clear or restore unwanted capabilities on the member interface 898 */ 899 static void 900 bridge_mutecaps(struct bridge_softc *sc) 901 { 902 struct bridge_iflist *bif; 903 int enabled, mask; 904 905 /* Initial bitmask of capabilities to test */ 906 mask = BRIDGE_IFCAPS_MASK; 907 908 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 909 /* Every member must support it or its disabled */ 910 mask &= bif->bif_savedcaps; 911 } 912 913 BRIDGE_XLOCK(sc); 914 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 915 enabled = bif->bif_ifp->if_capenable; 916 enabled &= ~BRIDGE_IFCAPS_STRIP; 917 /* strip off mask bits and enable them again if allowed */ 918 enabled &= ~BRIDGE_IFCAPS_MASK; 919 enabled |= mask; 920 BRIDGE_UNLOCK(sc); 921 bridge_set_ifcap(sc, bif, enabled); 922 BRIDGE_LOCK(sc); 923 } 924 BRIDGE_XDROP(sc); 925 926 } 927 928 static void 929 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 930 { 931 struct ifnet *ifp = bif->bif_ifp; 932 struct ifreq ifr; 933 int error; 934 935 BRIDGE_UNLOCK_ASSERT(sc); 936 937 bzero(&ifr, sizeof(ifr)); 938 ifr.ifr_reqcap = set; 939 940 if (ifp->if_capenable != set) { 941 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 942 if (error) 943 if_printf(sc->sc_ifp, 944 "error setting capabilities on %s: %d\n", 945 ifp->if_xname, error); 946 if ((ifp->if_capenable & ~set) != 0) 947 if_printf(sc->sc_ifp, 948 "can't disable some capabilities on %s: 0x%x\n", 949 ifp->if_xname, ifp->if_capenable & ~set); 950 } 951 } 952 953 /* 954 * bridge_lookup_member: 955 * 956 * Lookup a bridge member interface. 957 */ 958 static struct bridge_iflist * 959 bridge_lookup_member(struct bridge_softc *sc, const char *name) 960 { 961 struct bridge_iflist *bif; 962 struct ifnet *ifp; 963 964 BRIDGE_LOCK_ASSERT(sc); 965 966 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 967 ifp = bif->bif_ifp; 968 if (strcmp(ifp->if_xname, name) == 0) 969 return (bif); 970 } 971 972 return (NULL); 973 } 974 975 /* 976 * bridge_lookup_member_if: 977 * 978 * Lookup a bridge member interface by ifnet*. 979 */ 980 static struct bridge_iflist * 981 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 982 { 983 struct bridge_iflist *bif; 984 985 BRIDGE_LOCK_ASSERT(sc); 986 987 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 988 if (bif->bif_ifp == member_ifp) 989 return (bif); 990 } 991 992 return (NULL); 993 } 994 995 /* 996 * bridge_delete_member: 997 * 998 * Delete the specified member interface. 999 */ 1000 static void 1001 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1002 int gone) 1003 { 1004 struct ifnet *ifs = bif->bif_ifp; 1005 struct ifnet *fif = NULL; 1006 1007 BRIDGE_LOCK_ASSERT(sc); 1008 1009 if (bif->bif_flags & IFBIF_STP) 1010 bstp_disable(&bif->bif_stp); 1011 1012 ifs->if_bridge = NULL; 1013 BRIDGE_XLOCK(sc); 1014 LIST_REMOVE(bif, bif_next); 1015 BRIDGE_XDROP(sc); 1016 1017 /* 1018 * If removing the interface that gave the bridge its mac address, set 1019 * the mac address of the bridge to the address of the next member, or 1020 * to its default address if no members are left. 1021 */ 1022 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1023 if (LIST_EMPTY(&sc->sc_iflist)) { 1024 bcopy(sc->sc_defaddr, 1025 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1026 sc->sc_ifaddr = NULL; 1027 } else { 1028 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 1029 bcopy(IF_LLADDR(fif), 1030 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1031 sc->sc_ifaddr = fif; 1032 } 1033 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1034 } 1035 1036 bridge_linkcheck(sc); 1037 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1038 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1039 KASSERT(bif->bif_addrcnt == 0, 1040 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1041 1042 BRIDGE_UNLOCK(sc); 1043 if (!gone) { 1044 switch (ifs->if_type) { 1045 case IFT_ETHER: 1046 case IFT_L2VLAN: 1047 /* 1048 * Take the interface out of promiscuous mode, but only 1049 * if it was promiscuous in the first place. It might 1050 * not be if we're in the bridge_ioctl_add() error path. 1051 */ 1052 if (ifs->if_flags & IFF_PROMISC) 1053 (void) ifpromisc(ifs, 0); 1054 break; 1055 1056 case IFT_GIF: 1057 break; 1058 1059 default: 1060 #ifdef DIAGNOSTIC 1061 panic("bridge_delete_member: impossible"); 1062 #endif 1063 break; 1064 } 1065 /* reneable any interface capabilities */ 1066 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1067 } 1068 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1069 BRIDGE_LOCK(sc); 1070 free(bif, M_DEVBUF); 1071 } 1072 1073 /* 1074 * bridge_delete_span: 1075 * 1076 * Delete the specified span interface. 1077 */ 1078 static void 1079 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1080 { 1081 BRIDGE_LOCK_ASSERT(sc); 1082 1083 KASSERT(bif->bif_ifp->if_bridge == NULL, 1084 ("%s: not a span interface", __func__)); 1085 1086 LIST_REMOVE(bif, bif_next); 1087 free(bif, M_DEVBUF); 1088 } 1089 1090 static int 1091 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1092 { 1093 struct ifbreq *req = arg; 1094 struct bridge_iflist *bif = NULL; 1095 struct ifnet *ifs; 1096 int error = 0; 1097 1098 ifs = ifunit(req->ifbr_ifsname); 1099 if (ifs == NULL) 1100 return (ENOENT); 1101 if (ifs->if_ioctl == NULL) /* must be supported */ 1102 return (EINVAL); 1103 1104 /* If it's in the span list, it can't be a member. */ 1105 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1106 if (ifs == bif->bif_ifp) 1107 return (EBUSY); 1108 1109 if (ifs->if_bridge == sc) 1110 return (EEXIST); 1111 1112 if (ifs->if_bridge != NULL) 1113 return (EBUSY); 1114 1115 switch (ifs->if_type) { 1116 case IFT_ETHER: 1117 case IFT_L2VLAN: 1118 case IFT_GIF: 1119 /* permitted interface types */ 1120 break; 1121 default: 1122 return (EINVAL); 1123 } 1124 1125 #ifdef INET6 1126 /* 1127 * Two valid inet6 addresses with link-local scope must not be 1128 * on the parent interface and the member interfaces at the 1129 * same time. This restriction is needed to prevent violation 1130 * of link-local scope zone. Attempts to add a member 1131 * interface which has inet6 addresses when the parent has 1132 * inet6 triggers removal of all inet6 addresses on the member 1133 * interface. 1134 */ 1135 1136 /* Check if the parent interface has a link-local scope addr. */ 1137 if (V_allow_llz_overlap == 0 && 1138 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1139 /* 1140 * If any, remove all inet6 addresses from the member 1141 * interfaces. 1142 */ 1143 BRIDGE_XLOCK(sc); 1144 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1145 if (in6ifa_llaonifp(bif->bif_ifp)) { 1146 BRIDGE_UNLOCK(sc); 1147 in6_ifdetach(bif->bif_ifp); 1148 BRIDGE_LOCK(sc); 1149 if_printf(sc->sc_ifp, 1150 "IPv6 addresses on %s have been removed " 1151 "before adding it as a member to prevent " 1152 "IPv6 address scope violation.\n", 1153 bif->bif_ifp->if_xname); 1154 } 1155 } 1156 BRIDGE_XDROP(sc); 1157 if (in6ifa_llaonifp(ifs)) { 1158 BRIDGE_UNLOCK(sc); 1159 in6_ifdetach(ifs); 1160 BRIDGE_LOCK(sc); 1161 if_printf(sc->sc_ifp, 1162 "IPv6 addresses on %s have been removed " 1163 "before adding it as a member to prevent " 1164 "IPv6 address scope violation.\n", 1165 ifs->if_xname); 1166 } 1167 } 1168 #endif 1169 /* Allow the first Ethernet member to define the MTU */ 1170 if (LIST_EMPTY(&sc->sc_iflist)) 1171 sc->sc_ifp->if_mtu = ifs->if_mtu; 1172 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1173 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1174 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1175 return (EINVAL); 1176 } 1177 1178 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1179 if (bif == NULL) 1180 return (ENOMEM); 1181 1182 bif->bif_ifp = ifs; 1183 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1184 bif->bif_savedcaps = ifs->if_capenable; 1185 1186 /* 1187 * Assign the interface's MAC address to the bridge if it's the first 1188 * member and the MAC address of the bridge has not been changed from 1189 * the default randomly generated one. 1190 */ 1191 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1192 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1193 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1194 sc->sc_ifaddr = ifs; 1195 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1196 } 1197 1198 ifs->if_bridge = sc; 1199 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1200 /* 1201 * XXX: XLOCK HERE!?! 1202 * 1203 * NOTE: insert_***HEAD*** should be safe for the traversals. 1204 */ 1205 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1206 1207 /* Set interface capabilities to the intersection set of all members */ 1208 bridge_mutecaps(sc); 1209 bridge_linkcheck(sc); 1210 1211 /* Place the interface into promiscuous mode */ 1212 switch (ifs->if_type) { 1213 case IFT_ETHER: 1214 case IFT_L2VLAN: 1215 BRIDGE_UNLOCK(sc); 1216 error = ifpromisc(ifs, 1); 1217 BRIDGE_LOCK(sc); 1218 break; 1219 } 1220 1221 if (error) 1222 bridge_delete_member(sc, bif, 0); 1223 return (error); 1224 } 1225 1226 static int 1227 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1228 { 1229 struct ifbreq *req = arg; 1230 struct bridge_iflist *bif; 1231 1232 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1233 if (bif == NULL) 1234 return (ENOENT); 1235 1236 bridge_delete_member(sc, bif, 0); 1237 1238 return (0); 1239 } 1240 1241 static int 1242 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1243 { 1244 struct ifbreq *req = arg; 1245 struct bridge_iflist *bif; 1246 struct bstp_port *bp; 1247 1248 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1249 if (bif == NULL) 1250 return (ENOENT); 1251 1252 bp = &bif->bif_stp; 1253 req->ifbr_ifsflags = bif->bif_flags; 1254 req->ifbr_state = bp->bp_state; 1255 req->ifbr_priority = bp->bp_priority; 1256 req->ifbr_path_cost = bp->bp_path_cost; 1257 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1258 req->ifbr_proto = bp->bp_protover; 1259 req->ifbr_role = bp->bp_role; 1260 req->ifbr_stpflags = bp->bp_flags; 1261 req->ifbr_addrcnt = bif->bif_addrcnt; 1262 req->ifbr_addrmax = bif->bif_addrmax; 1263 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1264 1265 /* Copy STP state options as flags */ 1266 if (bp->bp_operedge) 1267 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1268 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1269 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1270 if (bp->bp_ptp_link) 1271 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1272 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1273 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1274 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1275 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1276 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1277 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1278 return (0); 1279 } 1280 1281 static int 1282 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1283 { 1284 struct ifbreq *req = arg; 1285 struct bridge_iflist *bif; 1286 struct bstp_port *bp; 1287 int error; 1288 1289 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1290 if (bif == NULL) 1291 return (ENOENT); 1292 bp = &bif->bif_stp; 1293 1294 if (req->ifbr_ifsflags & IFBIF_SPAN) 1295 /* SPAN is readonly */ 1296 return (EINVAL); 1297 1298 if (req->ifbr_ifsflags & IFBIF_STP) { 1299 if ((bif->bif_flags & IFBIF_STP) == 0) { 1300 error = bstp_enable(&bif->bif_stp); 1301 if (error) 1302 return (error); 1303 } 1304 } else { 1305 if ((bif->bif_flags & IFBIF_STP) != 0) 1306 bstp_disable(&bif->bif_stp); 1307 } 1308 1309 /* Pass on STP flags */ 1310 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1311 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1312 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1313 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1314 1315 /* Save the bits relating to the bridge */ 1316 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1317 1318 return (0); 1319 } 1320 1321 static int 1322 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1323 { 1324 struct ifbrparam *param = arg; 1325 1326 sc->sc_brtmax = param->ifbrp_csize; 1327 bridge_rttrim(sc); 1328 1329 return (0); 1330 } 1331 1332 static int 1333 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1334 { 1335 struct ifbrparam *param = arg; 1336 1337 param->ifbrp_csize = sc->sc_brtmax; 1338 1339 return (0); 1340 } 1341 1342 static int 1343 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1344 { 1345 struct ifbifconf *bifc = arg; 1346 struct bridge_iflist *bif; 1347 struct ifbreq breq; 1348 char *buf, *outbuf; 1349 int count, buflen, len, error = 0; 1350 1351 count = 0; 1352 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1353 count++; 1354 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1355 count++; 1356 1357 buflen = sizeof(breq) * count; 1358 if (bifc->ifbic_len == 0) { 1359 bifc->ifbic_len = buflen; 1360 return (0); 1361 } 1362 BRIDGE_UNLOCK(sc); 1363 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1364 BRIDGE_LOCK(sc); 1365 1366 count = 0; 1367 buf = outbuf; 1368 len = min(bifc->ifbic_len, buflen); 1369 bzero(&breq, sizeof(breq)); 1370 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1371 if (len < sizeof(breq)) 1372 break; 1373 1374 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1375 sizeof(breq.ifbr_ifsname)); 1376 /* Fill in the ifbreq structure */ 1377 error = bridge_ioctl_gifflags(sc, &breq); 1378 if (error) 1379 break; 1380 memcpy(buf, &breq, sizeof(breq)); 1381 count++; 1382 buf += sizeof(breq); 1383 len -= sizeof(breq); 1384 } 1385 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1386 if (len < sizeof(breq)) 1387 break; 1388 1389 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1390 sizeof(breq.ifbr_ifsname)); 1391 breq.ifbr_ifsflags = bif->bif_flags; 1392 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1393 memcpy(buf, &breq, sizeof(breq)); 1394 count++; 1395 buf += sizeof(breq); 1396 len -= sizeof(breq); 1397 } 1398 1399 BRIDGE_UNLOCK(sc); 1400 bifc->ifbic_len = sizeof(breq) * count; 1401 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1402 BRIDGE_LOCK(sc); 1403 free(outbuf, M_TEMP); 1404 return (error); 1405 } 1406 1407 static int 1408 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1409 { 1410 struct ifbaconf *bac = arg; 1411 struct bridge_rtnode *brt; 1412 struct ifbareq bareq; 1413 char *buf, *outbuf; 1414 int count, buflen, len, error = 0; 1415 1416 if (bac->ifbac_len == 0) 1417 return (0); 1418 1419 count = 0; 1420 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1421 count++; 1422 buflen = sizeof(bareq) * count; 1423 1424 BRIDGE_UNLOCK(sc); 1425 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1426 BRIDGE_LOCK(sc); 1427 1428 count = 0; 1429 buf = outbuf; 1430 len = min(bac->ifbac_len, buflen); 1431 bzero(&bareq, sizeof(bareq)); 1432 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1433 if (len < sizeof(bareq)) 1434 goto out; 1435 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1436 sizeof(bareq.ifba_ifsname)); 1437 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1438 bareq.ifba_vlan = brt->brt_vlan; 1439 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1440 time_uptime < brt->brt_expire) 1441 bareq.ifba_expire = brt->brt_expire - time_uptime; 1442 else 1443 bareq.ifba_expire = 0; 1444 bareq.ifba_flags = brt->brt_flags; 1445 1446 memcpy(buf, &bareq, sizeof(bareq)); 1447 count++; 1448 buf += sizeof(bareq); 1449 len -= sizeof(bareq); 1450 } 1451 out: 1452 BRIDGE_UNLOCK(sc); 1453 bac->ifbac_len = sizeof(bareq) * count; 1454 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1455 BRIDGE_LOCK(sc); 1456 free(outbuf, M_TEMP); 1457 return (error); 1458 } 1459 1460 static int 1461 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1462 { 1463 struct ifbareq *req = arg; 1464 struct bridge_iflist *bif; 1465 int error; 1466 1467 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1468 if (bif == NULL) 1469 return (ENOENT); 1470 1471 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1472 req->ifba_flags); 1473 1474 return (error); 1475 } 1476 1477 static int 1478 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1479 { 1480 struct ifbrparam *param = arg; 1481 1482 sc->sc_brttimeout = param->ifbrp_ctime; 1483 return (0); 1484 } 1485 1486 static int 1487 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1488 { 1489 struct ifbrparam *param = arg; 1490 1491 param->ifbrp_ctime = sc->sc_brttimeout; 1492 return (0); 1493 } 1494 1495 static int 1496 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1497 { 1498 struct ifbareq *req = arg; 1499 1500 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1501 } 1502 1503 static int 1504 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1505 { 1506 struct ifbreq *req = arg; 1507 1508 bridge_rtflush(sc, req->ifbr_ifsflags); 1509 return (0); 1510 } 1511 1512 static int 1513 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1514 { 1515 struct ifbrparam *param = arg; 1516 struct bstp_state *bs = &sc->sc_stp; 1517 1518 param->ifbrp_prio = bs->bs_bridge_priority; 1519 return (0); 1520 } 1521 1522 static int 1523 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1524 { 1525 struct ifbrparam *param = arg; 1526 1527 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1528 } 1529 1530 static int 1531 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1532 { 1533 struct ifbrparam *param = arg; 1534 struct bstp_state *bs = &sc->sc_stp; 1535 1536 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1537 return (0); 1538 } 1539 1540 static int 1541 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1542 { 1543 struct ifbrparam *param = arg; 1544 1545 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1546 } 1547 1548 static int 1549 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1550 { 1551 struct ifbrparam *param = arg; 1552 struct bstp_state *bs = &sc->sc_stp; 1553 1554 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1555 return (0); 1556 } 1557 1558 static int 1559 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1560 { 1561 struct ifbrparam *param = arg; 1562 1563 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1564 } 1565 1566 static int 1567 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1568 { 1569 struct ifbrparam *param = arg; 1570 struct bstp_state *bs = &sc->sc_stp; 1571 1572 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1573 return (0); 1574 } 1575 1576 static int 1577 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1578 { 1579 struct ifbrparam *param = arg; 1580 1581 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1582 } 1583 1584 static int 1585 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1586 { 1587 struct ifbreq *req = arg; 1588 struct bridge_iflist *bif; 1589 1590 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1591 if (bif == NULL) 1592 return (ENOENT); 1593 1594 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1595 } 1596 1597 static int 1598 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1599 { 1600 struct ifbreq *req = arg; 1601 struct bridge_iflist *bif; 1602 1603 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1604 if (bif == NULL) 1605 return (ENOENT); 1606 1607 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1608 } 1609 1610 static int 1611 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1612 { 1613 struct ifbreq *req = arg; 1614 struct bridge_iflist *bif; 1615 1616 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1617 if (bif == NULL) 1618 return (ENOENT); 1619 1620 bif->bif_addrmax = req->ifbr_addrmax; 1621 return (0); 1622 } 1623 1624 static int 1625 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1626 { 1627 struct ifbreq *req = arg; 1628 struct bridge_iflist *bif = NULL; 1629 struct ifnet *ifs; 1630 1631 ifs = ifunit(req->ifbr_ifsname); 1632 if (ifs == NULL) 1633 return (ENOENT); 1634 1635 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1636 if (ifs == bif->bif_ifp) 1637 return (EBUSY); 1638 1639 if (ifs->if_bridge != NULL) 1640 return (EBUSY); 1641 1642 switch (ifs->if_type) { 1643 case IFT_ETHER: 1644 case IFT_GIF: 1645 case IFT_L2VLAN: 1646 break; 1647 default: 1648 return (EINVAL); 1649 } 1650 1651 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1652 if (bif == NULL) 1653 return (ENOMEM); 1654 1655 bif->bif_ifp = ifs; 1656 bif->bif_flags = IFBIF_SPAN; 1657 1658 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1659 1660 return (0); 1661 } 1662 1663 static int 1664 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1665 { 1666 struct ifbreq *req = arg; 1667 struct bridge_iflist *bif; 1668 struct ifnet *ifs; 1669 1670 ifs = ifunit(req->ifbr_ifsname); 1671 if (ifs == NULL) 1672 return (ENOENT); 1673 1674 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1675 if (ifs == bif->bif_ifp) 1676 break; 1677 1678 if (bif == NULL) 1679 return (ENOENT); 1680 1681 bridge_delete_span(sc, bif); 1682 1683 return (0); 1684 } 1685 1686 static int 1687 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1688 { 1689 struct ifbropreq *req = arg; 1690 struct bstp_state *bs = &sc->sc_stp; 1691 struct bstp_port *root_port; 1692 1693 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1694 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1695 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1696 1697 root_port = bs->bs_root_port; 1698 if (root_port == NULL) 1699 req->ifbop_root_port = 0; 1700 else 1701 req->ifbop_root_port = root_port->bp_ifp->if_index; 1702 1703 req->ifbop_holdcount = bs->bs_txholdcount; 1704 req->ifbop_priority = bs->bs_bridge_priority; 1705 req->ifbop_protocol = bs->bs_protover; 1706 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1707 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1708 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1709 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1710 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1711 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1712 1713 return (0); 1714 } 1715 1716 static int 1717 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1718 { 1719 struct ifbrparam *param = arg; 1720 1721 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1722 return (0); 1723 } 1724 1725 static int 1726 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1727 { 1728 struct ifbpstpconf *bifstp = arg; 1729 struct bridge_iflist *bif; 1730 struct bstp_port *bp; 1731 struct ifbpstpreq bpreq; 1732 char *buf, *outbuf; 1733 int count, buflen, len, error = 0; 1734 1735 count = 0; 1736 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1737 if ((bif->bif_flags & IFBIF_STP) != 0) 1738 count++; 1739 } 1740 1741 buflen = sizeof(bpreq) * count; 1742 if (bifstp->ifbpstp_len == 0) { 1743 bifstp->ifbpstp_len = buflen; 1744 return (0); 1745 } 1746 1747 BRIDGE_UNLOCK(sc); 1748 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1749 BRIDGE_LOCK(sc); 1750 1751 count = 0; 1752 buf = outbuf; 1753 len = min(bifstp->ifbpstp_len, buflen); 1754 bzero(&bpreq, sizeof(bpreq)); 1755 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1756 if (len < sizeof(bpreq)) 1757 break; 1758 1759 if ((bif->bif_flags & IFBIF_STP) == 0) 1760 continue; 1761 1762 bp = &bif->bif_stp; 1763 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1764 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1765 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1766 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1767 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1768 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1769 1770 memcpy(buf, &bpreq, sizeof(bpreq)); 1771 count++; 1772 buf += sizeof(bpreq); 1773 len -= sizeof(bpreq); 1774 } 1775 1776 BRIDGE_UNLOCK(sc); 1777 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1778 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1779 BRIDGE_LOCK(sc); 1780 free(outbuf, M_TEMP); 1781 return (error); 1782 } 1783 1784 static int 1785 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1786 { 1787 struct ifbrparam *param = arg; 1788 1789 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1790 } 1791 1792 static int 1793 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1794 { 1795 struct ifbrparam *param = arg; 1796 1797 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1798 } 1799 1800 /* 1801 * bridge_ifdetach: 1802 * 1803 * Detach an interface from a bridge. Called when a member 1804 * interface is detaching. 1805 */ 1806 static void 1807 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1808 { 1809 struct bridge_softc *sc = ifp->if_bridge; 1810 struct bridge_iflist *bif; 1811 1812 if (ifp->if_flags & IFF_RENAMING) 1813 return; 1814 if (V_bridge_cloner == NULL) { 1815 /* 1816 * This detach handler can be called after 1817 * vnet_bridge_uninit(). Just return in that case. 1818 */ 1819 return; 1820 } 1821 /* Check if the interface is a bridge member */ 1822 if (sc != NULL) { 1823 BRIDGE_LOCK(sc); 1824 1825 bif = bridge_lookup_member_if(sc, ifp); 1826 if (bif != NULL) 1827 bridge_delete_member(sc, bif, 1); 1828 1829 BRIDGE_UNLOCK(sc); 1830 return; 1831 } 1832 1833 /* Check if the interface is a span port */ 1834 BRIDGE_LIST_LOCK(); 1835 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1836 BRIDGE_LOCK(sc); 1837 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1838 if (ifp == bif->bif_ifp) { 1839 bridge_delete_span(sc, bif); 1840 break; 1841 } 1842 1843 BRIDGE_UNLOCK(sc); 1844 } 1845 BRIDGE_LIST_UNLOCK(); 1846 } 1847 1848 /* 1849 * bridge_init: 1850 * 1851 * Initialize a bridge interface. 1852 */ 1853 static void 1854 bridge_init(void *xsc) 1855 { 1856 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1857 struct ifnet *ifp = sc->sc_ifp; 1858 1859 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1860 return; 1861 1862 BRIDGE_LOCK(sc); 1863 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1864 bridge_timer, sc); 1865 1866 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1867 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1868 1869 BRIDGE_UNLOCK(sc); 1870 } 1871 1872 /* 1873 * bridge_stop: 1874 * 1875 * Stop the bridge interface. 1876 */ 1877 static void 1878 bridge_stop(struct ifnet *ifp, int disable) 1879 { 1880 struct bridge_softc *sc = ifp->if_softc; 1881 1882 BRIDGE_LOCK_ASSERT(sc); 1883 1884 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1885 return; 1886 1887 callout_stop(&sc->sc_brcallout); 1888 bstp_stop(&sc->sc_stp); 1889 1890 bridge_rtflush(sc, IFBF_FLUSHDYN); 1891 1892 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1893 } 1894 1895 /* 1896 * bridge_enqueue: 1897 * 1898 * Enqueue a packet on a bridge member interface. 1899 * 1900 */ 1901 static int 1902 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1903 { 1904 int len, err = 0; 1905 short mflags; 1906 struct mbuf *m0; 1907 1908 /* We may be sending a fragment so traverse the mbuf */ 1909 for (; m; m = m0) { 1910 m0 = m->m_nextpkt; 1911 m->m_nextpkt = NULL; 1912 len = m->m_pkthdr.len; 1913 mflags = m->m_flags; 1914 1915 /* 1916 * If underlying interface can not do VLAN tag insertion itself 1917 * then attach a packet tag that holds it. 1918 */ 1919 if ((m->m_flags & M_VLANTAG) && 1920 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1921 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1922 if (m == NULL) { 1923 if_printf(dst_ifp, 1924 "unable to prepend VLAN header\n"); 1925 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 1926 continue; 1927 } 1928 m->m_flags &= ~M_VLANTAG; 1929 } 1930 1931 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 1932 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1933 m_freem(m0); 1934 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1935 break; 1936 } 1937 1938 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 1939 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 1940 if (mflags & M_MCAST) 1941 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 1942 } 1943 1944 return (err); 1945 } 1946 1947 /* 1948 * bridge_dummynet: 1949 * 1950 * Receive a queued packet from dummynet and pass it on to the output 1951 * interface. 1952 * 1953 * The mbuf has the Ethernet header already attached. 1954 */ 1955 static void 1956 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1957 { 1958 struct bridge_softc *sc; 1959 1960 sc = ifp->if_bridge; 1961 1962 /* 1963 * The packet didnt originate from a member interface. This should only 1964 * ever happen if a member interface is removed while packets are 1965 * queued for it. 1966 */ 1967 if (sc == NULL) { 1968 m_freem(m); 1969 return; 1970 } 1971 1972 if (PFIL_HOOKED(&V_inet_pfil_hook) 1973 #ifdef INET6 1974 || PFIL_HOOKED(&V_inet6_pfil_hook) 1975 #endif 1976 ) { 1977 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1978 return; 1979 if (m == NULL) 1980 return; 1981 } 1982 1983 bridge_enqueue(sc, ifp, m); 1984 } 1985 1986 /* 1987 * bridge_output: 1988 * 1989 * Send output from a bridge member interface. This 1990 * performs the bridging function for locally originated 1991 * packets. 1992 * 1993 * The mbuf has the Ethernet header already attached. We must 1994 * enqueue or free the mbuf before returning. 1995 */ 1996 static int 1997 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1998 struct rtentry *rt) 1999 { 2000 struct ether_header *eh; 2001 struct ifnet *dst_if; 2002 struct bridge_softc *sc; 2003 uint16_t vlan; 2004 2005 if (m->m_len < ETHER_HDR_LEN) { 2006 m = m_pullup(m, ETHER_HDR_LEN); 2007 if (m == NULL) 2008 return (0); 2009 } 2010 2011 eh = mtod(m, struct ether_header *); 2012 sc = ifp->if_bridge; 2013 vlan = VLANTAGOF(m); 2014 2015 BRIDGE_LOCK(sc); 2016 2017 /* 2018 * If bridge is down, but the original output interface is up, 2019 * go ahead and send out that interface. Otherwise, the packet 2020 * is dropped below. 2021 */ 2022 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2023 dst_if = ifp; 2024 goto sendunicast; 2025 } 2026 2027 /* 2028 * If the packet is a multicast, or we don't know a better way to 2029 * get there, send to all interfaces. 2030 */ 2031 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2032 dst_if = NULL; 2033 else 2034 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2035 if (dst_if == NULL) { 2036 struct bridge_iflist *bif; 2037 struct mbuf *mc; 2038 int error = 0, used = 0; 2039 2040 bridge_span(sc, m); 2041 2042 BRIDGE_LOCK2REF(sc, error); 2043 if (error) { 2044 m_freem(m); 2045 return (0); 2046 } 2047 2048 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2049 dst_if = bif->bif_ifp; 2050 2051 if (dst_if->if_type == IFT_GIF) 2052 continue; 2053 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2054 continue; 2055 2056 /* 2057 * If this is not the original output interface, 2058 * and the interface is participating in spanning 2059 * tree, make sure the port is in a state that 2060 * allows forwarding. 2061 */ 2062 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2063 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2064 continue; 2065 2066 if (LIST_NEXT(bif, bif_next) == NULL) { 2067 used = 1; 2068 mc = m; 2069 } else { 2070 mc = m_copypacket(m, M_NOWAIT); 2071 if (mc == NULL) { 2072 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2073 continue; 2074 } 2075 } 2076 2077 bridge_enqueue(sc, dst_if, mc); 2078 } 2079 if (used == 0) 2080 m_freem(m); 2081 BRIDGE_UNREF(sc); 2082 return (0); 2083 } 2084 2085 sendunicast: 2086 /* 2087 * XXX Spanning tree consideration here? 2088 */ 2089 2090 bridge_span(sc, m); 2091 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2092 m_freem(m); 2093 BRIDGE_UNLOCK(sc); 2094 return (0); 2095 } 2096 2097 BRIDGE_UNLOCK(sc); 2098 bridge_enqueue(sc, dst_if, m); 2099 return (0); 2100 } 2101 2102 /* 2103 * bridge_transmit: 2104 * 2105 * Do output on a bridge. 2106 * 2107 */ 2108 static int 2109 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2110 { 2111 struct bridge_softc *sc; 2112 struct ether_header *eh; 2113 struct ifnet *dst_if; 2114 int error = 0; 2115 2116 sc = ifp->if_softc; 2117 2118 ETHER_BPF_MTAP(ifp, m); 2119 2120 eh = mtod(m, struct ether_header *); 2121 2122 BRIDGE_LOCK(sc); 2123 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2124 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2125 BRIDGE_UNLOCK(sc); 2126 error = bridge_enqueue(sc, dst_if, m); 2127 } else 2128 bridge_broadcast(sc, ifp, m, 0); 2129 2130 return (error); 2131 } 2132 2133 /* 2134 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2135 */ 2136 static void 2137 bridge_qflush(struct ifnet *ifp __unused) 2138 { 2139 } 2140 2141 /* 2142 * bridge_forward: 2143 * 2144 * The forwarding function of the bridge. 2145 * 2146 * NOTE: Releases the lock on return. 2147 */ 2148 static void 2149 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2150 struct mbuf *m) 2151 { 2152 struct bridge_iflist *dbif; 2153 struct ifnet *src_if, *dst_if, *ifp; 2154 struct ether_header *eh; 2155 uint16_t vlan; 2156 uint8_t *dst; 2157 int error; 2158 2159 src_if = m->m_pkthdr.rcvif; 2160 ifp = sc->sc_ifp; 2161 2162 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2163 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2164 vlan = VLANTAGOF(m); 2165 2166 if ((sbif->bif_flags & IFBIF_STP) && 2167 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2168 goto drop; 2169 2170 eh = mtod(m, struct ether_header *); 2171 dst = eh->ether_dhost; 2172 2173 /* If the interface is learning, record the address. */ 2174 if (sbif->bif_flags & IFBIF_LEARNING) { 2175 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2176 sbif, 0, IFBAF_DYNAMIC); 2177 /* 2178 * If the interface has addresses limits then deny any source 2179 * that is not in the cache. 2180 */ 2181 if (error && sbif->bif_addrmax) 2182 goto drop; 2183 } 2184 2185 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2186 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2187 goto drop; 2188 2189 /* 2190 * At this point, the port either doesn't participate 2191 * in spanning tree or it is in the forwarding state. 2192 */ 2193 2194 /* 2195 * If the packet is unicast, destined for someone on 2196 * "this" side of the bridge, drop it. 2197 */ 2198 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2199 dst_if = bridge_rtlookup(sc, dst, vlan); 2200 if (src_if == dst_if) 2201 goto drop; 2202 } else { 2203 /* 2204 * Check if its a reserved multicast address, any address 2205 * listed in 802.1D section 7.12.6 may not be forwarded by the 2206 * bridge. 2207 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2208 */ 2209 if (dst[0] == 0x01 && dst[1] == 0x80 && 2210 dst[2] == 0xc2 && dst[3] == 0x00 && 2211 dst[4] == 0x00 && dst[5] <= 0x0f) 2212 goto drop; 2213 2214 /* ...forward it to all interfaces. */ 2215 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2216 dst_if = NULL; 2217 } 2218 2219 /* 2220 * If we have a destination interface which is a member of our bridge, 2221 * OR this is a unicast packet, push it through the bpf(4) machinery. 2222 * For broadcast or multicast packets, don't bother because it will 2223 * be reinjected into ether_input. We do this before we pass the packets 2224 * through the pfil(9) framework, as it is possible that pfil(9) will 2225 * drop the packet, or possibly modify it, making it difficult to debug 2226 * firewall issues on the bridge. 2227 */ 2228 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2229 ETHER_BPF_MTAP(ifp, m); 2230 2231 /* run the packet filter */ 2232 if (PFIL_HOOKED(&V_inet_pfil_hook) 2233 #ifdef INET6 2234 || PFIL_HOOKED(&V_inet6_pfil_hook) 2235 #endif 2236 ) { 2237 BRIDGE_UNLOCK(sc); 2238 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2239 return; 2240 if (m == NULL) 2241 return; 2242 BRIDGE_LOCK(sc); 2243 } 2244 2245 if (dst_if == NULL) { 2246 bridge_broadcast(sc, src_if, m, 1); 2247 return; 2248 } 2249 2250 /* 2251 * At this point, we're dealing with a unicast frame 2252 * going to a different interface. 2253 */ 2254 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2255 goto drop; 2256 2257 dbif = bridge_lookup_member_if(sc, dst_if); 2258 if (dbif == NULL) 2259 /* Not a member of the bridge (anymore?) */ 2260 goto drop; 2261 2262 /* Private segments can not talk to each other */ 2263 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2264 goto drop; 2265 2266 if ((dbif->bif_flags & IFBIF_STP) && 2267 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2268 goto drop; 2269 2270 BRIDGE_UNLOCK(sc); 2271 2272 if (PFIL_HOOKED(&V_inet_pfil_hook) 2273 #ifdef INET6 2274 || PFIL_HOOKED(&V_inet6_pfil_hook) 2275 #endif 2276 ) { 2277 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2278 return; 2279 if (m == NULL) 2280 return; 2281 } 2282 2283 bridge_enqueue(sc, dst_if, m); 2284 return; 2285 2286 drop: 2287 BRIDGE_UNLOCK(sc); 2288 m_freem(m); 2289 } 2290 2291 /* 2292 * bridge_input: 2293 * 2294 * Receive input from a member interface. Queue the packet for 2295 * bridging if it is not for us. 2296 */ 2297 static struct mbuf * 2298 bridge_input(struct ifnet *ifp, struct mbuf *m) 2299 { 2300 struct bridge_softc *sc = ifp->if_bridge; 2301 struct bridge_iflist *bif, *bif2; 2302 struct ifnet *bifp; 2303 struct ether_header *eh; 2304 struct mbuf *mc, *mc2; 2305 uint16_t vlan; 2306 int error; 2307 2308 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2309 return (m); 2310 2311 bifp = sc->sc_ifp; 2312 vlan = VLANTAGOF(m); 2313 2314 /* 2315 * Implement support for bridge monitoring. If this flag has been 2316 * set on this interface, discard the packet once we push it through 2317 * the bpf(4) machinery, but before we do, increment the byte and 2318 * packet counters associated with this interface. 2319 */ 2320 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2321 m->m_pkthdr.rcvif = bifp; 2322 ETHER_BPF_MTAP(bifp, m); 2323 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2324 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2325 m_freem(m); 2326 return (NULL); 2327 } 2328 BRIDGE_LOCK(sc); 2329 bif = bridge_lookup_member_if(sc, ifp); 2330 if (bif == NULL) { 2331 BRIDGE_UNLOCK(sc); 2332 return (m); 2333 } 2334 2335 eh = mtod(m, struct ether_header *); 2336 2337 bridge_span(sc, m); 2338 2339 if (m->m_flags & (M_BCAST|M_MCAST)) { 2340 /* Tap off 802.1D packets; they do not get forwarded. */ 2341 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2342 ETHER_ADDR_LEN) == 0) { 2343 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2344 BRIDGE_UNLOCK(sc); 2345 return (NULL); 2346 } 2347 2348 if ((bif->bif_flags & IFBIF_STP) && 2349 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2350 BRIDGE_UNLOCK(sc); 2351 return (m); 2352 } 2353 2354 /* 2355 * Make a deep copy of the packet and enqueue the copy 2356 * for bridge processing; return the original packet for 2357 * local processing. 2358 */ 2359 mc = m_dup(m, M_NOWAIT); 2360 if (mc == NULL) { 2361 BRIDGE_UNLOCK(sc); 2362 return (m); 2363 } 2364 2365 /* Perform the bridge forwarding function with the copy. */ 2366 bridge_forward(sc, bif, mc); 2367 2368 /* 2369 * Reinject the mbuf as arriving on the bridge so we have a 2370 * chance at claiming multicast packets. We can not loop back 2371 * here from ether_input as a bridge is never a member of a 2372 * bridge. 2373 */ 2374 KASSERT(bifp->if_bridge == NULL, 2375 ("loop created in bridge_input")); 2376 mc2 = m_dup(m, M_NOWAIT); 2377 if (mc2 != NULL) { 2378 /* Keep the layer3 header aligned */ 2379 int i = min(mc2->m_pkthdr.len, max_protohdr); 2380 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2381 } 2382 if (mc2 != NULL) { 2383 mc2->m_pkthdr.rcvif = bifp; 2384 (*bifp->if_input)(bifp, mc2); 2385 } 2386 2387 /* Return the original packet for local processing. */ 2388 return (m); 2389 } 2390 2391 if ((bif->bif_flags & IFBIF_STP) && 2392 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2393 BRIDGE_UNLOCK(sc); 2394 return (m); 2395 } 2396 2397 #if (defined(INET) || defined(INET6)) 2398 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2399 || ((iface)->if_carp \ 2400 && (*carp_forus_p)((iface), eh->ether_dhost)) 2401 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2402 || ((iface)->if_carp \ 2403 && (*carp_forus_p)((iface), eh->ether_shost)) 2404 #else 2405 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2406 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2407 #endif 2408 2409 #ifdef INET6 2410 # define OR_PFIL_HOOKED_INET6 \ 2411 || PFIL_HOOKED(&V_inet6_pfil_hook) 2412 #else 2413 # define OR_PFIL_HOOKED_INET6 2414 #endif 2415 2416 #define GRAB_OUR_PACKETS(iface) \ 2417 if ((iface)->if_type == IFT_GIF) \ 2418 continue; \ 2419 /* It is destined for us. */ \ 2420 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2421 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2422 ) { \ 2423 if ((iface)->if_type == IFT_BRIDGE) { \ 2424 ETHER_BPF_MTAP(iface, m); \ 2425 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \ 2426 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2427 /* Filter on the physical interface. */ \ 2428 if (V_pfil_local_phys && \ 2429 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2430 OR_PFIL_HOOKED_INET6)) { \ 2431 if (bridge_pfil(&m, NULL, ifp, \ 2432 PFIL_IN) != 0 || m == NULL) { \ 2433 BRIDGE_UNLOCK(sc); \ 2434 return (NULL); \ 2435 } \ 2436 eh = mtod(m, struct ether_header *); \ 2437 } \ 2438 } \ 2439 if (bif->bif_flags & IFBIF_LEARNING) { \ 2440 error = bridge_rtupdate(sc, eh->ether_shost, \ 2441 vlan, bif, 0, IFBAF_DYNAMIC); \ 2442 if (error && bif->bif_addrmax) { \ 2443 BRIDGE_UNLOCK(sc); \ 2444 m_freem(m); \ 2445 return (NULL); \ 2446 } \ 2447 } \ 2448 m->m_pkthdr.rcvif = iface; \ 2449 BRIDGE_UNLOCK(sc); \ 2450 return (m); \ 2451 } \ 2452 \ 2453 /* We just received a packet that we sent out. */ \ 2454 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2455 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2456 ) { \ 2457 BRIDGE_UNLOCK(sc); \ 2458 m_freem(m); \ 2459 return (NULL); \ 2460 } 2461 2462 /* 2463 * Unicast. Make sure it's not for the bridge. 2464 */ 2465 do { GRAB_OUR_PACKETS(bifp) } while (0); 2466 2467 /* 2468 * Give a chance for ifp at first priority. This will help when the 2469 * packet comes through the interface like VLAN's with the same MACs 2470 * on several interfaces from the same bridge. This also will save 2471 * some CPU cycles in case the destination interface and the input 2472 * interface (eq ifp) are the same. 2473 */ 2474 do { GRAB_OUR_PACKETS(ifp) } while (0); 2475 2476 /* Now check the all bridge members. */ 2477 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2478 GRAB_OUR_PACKETS(bif2->bif_ifp) 2479 } 2480 2481 #undef OR_CARP_CHECK_WE_ARE_DST 2482 #undef OR_CARP_CHECK_WE_ARE_SRC 2483 #undef OR_PFIL_HOOKED_INET6 2484 #undef GRAB_OUR_PACKETS 2485 2486 /* Perform the bridge forwarding function. */ 2487 bridge_forward(sc, bif, m); 2488 2489 return (NULL); 2490 } 2491 2492 /* 2493 * bridge_broadcast: 2494 * 2495 * Send a frame to all interfaces that are members of 2496 * the bridge, except for the one on which the packet 2497 * arrived. 2498 * 2499 * NOTE: Releases the lock on return. 2500 */ 2501 static void 2502 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2503 struct mbuf *m, int runfilt) 2504 { 2505 struct bridge_iflist *dbif, *sbif; 2506 struct mbuf *mc; 2507 struct ifnet *dst_if; 2508 int error = 0, used = 0, i; 2509 2510 sbif = bridge_lookup_member_if(sc, src_if); 2511 2512 BRIDGE_LOCK2REF(sc, error); 2513 if (error) { 2514 m_freem(m); 2515 return; 2516 } 2517 2518 /* Filter on the bridge interface before broadcasting */ 2519 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2520 #ifdef INET6 2521 || PFIL_HOOKED(&V_inet6_pfil_hook) 2522 #endif 2523 )) { 2524 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2525 goto out; 2526 if (m == NULL) 2527 goto out; 2528 } 2529 2530 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2531 dst_if = dbif->bif_ifp; 2532 if (dst_if == src_if) 2533 continue; 2534 2535 /* Private segments can not talk to each other */ 2536 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2537 continue; 2538 2539 if ((dbif->bif_flags & IFBIF_STP) && 2540 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2541 continue; 2542 2543 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2544 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2545 continue; 2546 2547 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2548 continue; 2549 2550 if (LIST_NEXT(dbif, bif_next) == NULL) { 2551 mc = m; 2552 used = 1; 2553 } else { 2554 mc = m_dup(m, M_NOWAIT); 2555 if (mc == NULL) { 2556 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2557 continue; 2558 } 2559 } 2560 2561 /* 2562 * Filter on the output interface. Pass a NULL bridge interface 2563 * pointer so we do not redundantly filter on the bridge for 2564 * each interface we broadcast on. 2565 */ 2566 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2567 #ifdef INET6 2568 || PFIL_HOOKED(&V_inet6_pfil_hook) 2569 #endif 2570 )) { 2571 if (used == 0) { 2572 /* Keep the layer3 header aligned */ 2573 i = min(mc->m_pkthdr.len, max_protohdr); 2574 mc = m_copyup(mc, i, ETHER_ALIGN); 2575 if (mc == NULL) { 2576 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2577 continue; 2578 } 2579 } 2580 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2581 continue; 2582 if (mc == NULL) 2583 continue; 2584 } 2585 2586 bridge_enqueue(sc, dst_if, mc); 2587 } 2588 if (used == 0) 2589 m_freem(m); 2590 2591 out: 2592 BRIDGE_UNREF(sc); 2593 } 2594 2595 /* 2596 * bridge_span: 2597 * 2598 * Duplicate a packet out one or more interfaces that are in span mode, 2599 * the original mbuf is unmodified. 2600 */ 2601 static void 2602 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2603 { 2604 struct bridge_iflist *bif; 2605 struct ifnet *dst_if; 2606 struct mbuf *mc; 2607 2608 if (LIST_EMPTY(&sc->sc_spanlist)) 2609 return; 2610 2611 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2612 dst_if = bif->bif_ifp; 2613 2614 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2615 continue; 2616 2617 mc = m_copypacket(m, M_NOWAIT); 2618 if (mc == NULL) { 2619 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2620 continue; 2621 } 2622 2623 bridge_enqueue(sc, dst_if, mc); 2624 } 2625 } 2626 2627 /* 2628 * bridge_rtupdate: 2629 * 2630 * Add a bridge routing entry. 2631 */ 2632 static int 2633 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2634 struct bridge_iflist *bif, int setflags, uint8_t flags) 2635 { 2636 struct bridge_rtnode *brt; 2637 int error; 2638 2639 BRIDGE_LOCK_ASSERT(sc); 2640 2641 /* Check the source address is valid and not multicast. */ 2642 if (ETHER_IS_MULTICAST(dst) || 2643 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2644 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2645 return (EINVAL); 2646 2647 /* 802.1p frames map to vlan 1 */ 2648 if (vlan == 0) 2649 vlan = 1; 2650 2651 /* 2652 * A route for this destination might already exist. If so, 2653 * update it, otherwise create a new one. 2654 */ 2655 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2656 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2657 sc->sc_brtexceeded++; 2658 return (ENOSPC); 2659 } 2660 /* Check per interface address limits (if enabled) */ 2661 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2662 bif->bif_addrexceeded++; 2663 return (ENOSPC); 2664 } 2665 2666 /* 2667 * Allocate a new bridge forwarding node, and 2668 * initialize the expiration time and Ethernet 2669 * address. 2670 */ 2671 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2672 if (brt == NULL) 2673 return (ENOMEM); 2674 2675 if (bif->bif_flags & IFBIF_STICKY) 2676 brt->brt_flags = IFBAF_STICKY; 2677 else 2678 brt->brt_flags = IFBAF_DYNAMIC; 2679 2680 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2681 brt->brt_vlan = vlan; 2682 2683 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2684 uma_zfree(bridge_rtnode_zone, brt); 2685 return (error); 2686 } 2687 brt->brt_dst = bif; 2688 bif->bif_addrcnt++; 2689 } 2690 2691 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2692 brt->brt_dst != bif) { 2693 brt->brt_dst->bif_addrcnt--; 2694 brt->brt_dst = bif; 2695 brt->brt_dst->bif_addrcnt++; 2696 } 2697 2698 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2699 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2700 if (setflags) 2701 brt->brt_flags = flags; 2702 2703 return (0); 2704 } 2705 2706 /* 2707 * bridge_rtlookup: 2708 * 2709 * Lookup the destination interface for an address. 2710 */ 2711 static struct ifnet * 2712 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2713 { 2714 struct bridge_rtnode *brt; 2715 2716 BRIDGE_LOCK_ASSERT(sc); 2717 2718 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2719 return (NULL); 2720 2721 return (brt->brt_ifp); 2722 } 2723 2724 /* 2725 * bridge_rttrim: 2726 * 2727 * Trim the routine table so that we have a number 2728 * of routing entries less than or equal to the 2729 * maximum number. 2730 */ 2731 static void 2732 bridge_rttrim(struct bridge_softc *sc) 2733 { 2734 struct bridge_rtnode *brt, *nbrt; 2735 2736 BRIDGE_LOCK_ASSERT(sc); 2737 2738 /* Make sure we actually need to do this. */ 2739 if (sc->sc_brtcnt <= sc->sc_brtmax) 2740 return; 2741 2742 /* Force an aging cycle; this might trim enough addresses. */ 2743 bridge_rtage(sc); 2744 if (sc->sc_brtcnt <= sc->sc_brtmax) 2745 return; 2746 2747 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2748 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2749 bridge_rtnode_destroy(sc, brt); 2750 if (sc->sc_brtcnt <= sc->sc_brtmax) 2751 return; 2752 } 2753 } 2754 } 2755 2756 /* 2757 * bridge_timer: 2758 * 2759 * Aging timer for the bridge. 2760 */ 2761 static void 2762 bridge_timer(void *arg) 2763 { 2764 struct bridge_softc *sc = arg; 2765 2766 BRIDGE_LOCK_ASSERT(sc); 2767 2768 bridge_rtage(sc); 2769 2770 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2771 callout_reset(&sc->sc_brcallout, 2772 bridge_rtable_prune_period * hz, bridge_timer, sc); 2773 } 2774 2775 /* 2776 * bridge_rtage: 2777 * 2778 * Perform an aging cycle. 2779 */ 2780 static void 2781 bridge_rtage(struct bridge_softc *sc) 2782 { 2783 struct bridge_rtnode *brt, *nbrt; 2784 2785 BRIDGE_LOCK_ASSERT(sc); 2786 2787 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2788 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2789 if (time_uptime >= brt->brt_expire) 2790 bridge_rtnode_destroy(sc, brt); 2791 } 2792 } 2793 } 2794 2795 /* 2796 * bridge_rtflush: 2797 * 2798 * Remove all dynamic addresses from the bridge. 2799 */ 2800 static void 2801 bridge_rtflush(struct bridge_softc *sc, int full) 2802 { 2803 struct bridge_rtnode *brt, *nbrt; 2804 2805 BRIDGE_LOCK_ASSERT(sc); 2806 2807 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2808 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2809 bridge_rtnode_destroy(sc, brt); 2810 } 2811 } 2812 2813 /* 2814 * bridge_rtdaddr: 2815 * 2816 * Remove an address from the table. 2817 */ 2818 static int 2819 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2820 { 2821 struct bridge_rtnode *brt; 2822 int found = 0; 2823 2824 BRIDGE_LOCK_ASSERT(sc); 2825 2826 /* 2827 * If vlan is zero then we want to delete for all vlans so the lookup 2828 * may return more than one. 2829 */ 2830 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2831 bridge_rtnode_destroy(sc, brt); 2832 found = 1; 2833 } 2834 2835 return (found ? 0 : ENOENT); 2836 } 2837 2838 /* 2839 * bridge_rtdelete: 2840 * 2841 * Delete routes to a speicifc member interface. 2842 */ 2843 static void 2844 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2845 { 2846 struct bridge_rtnode *brt, *nbrt; 2847 2848 BRIDGE_LOCK_ASSERT(sc); 2849 2850 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2851 if (brt->brt_ifp == ifp && (full || 2852 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2853 bridge_rtnode_destroy(sc, brt); 2854 } 2855 } 2856 2857 /* 2858 * bridge_rtable_init: 2859 * 2860 * Initialize the route table for this bridge. 2861 */ 2862 static void 2863 bridge_rtable_init(struct bridge_softc *sc) 2864 { 2865 int i; 2866 2867 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2868 M_DEVBUF, M_WAITOK); 2869 2870 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2871 LIST_INIT(&sc->sc_rthash[i]); 2872 2873 sc->sc_rthash_key = arc4random(); 2874 LIST_INIT(&sc->sc_rtlist); 2875 } 2876 2877 /* 2878 * bridge_rtable_fini: 2879 * 2880 * Deconstruct the route table for this bridge. 2881 */ 2882 static void 2883 bridge_rtable_fini(struct bridge_softc *sc) 2884 { 2885 2886 KASSERT(sc->sc_brtcnt == 0, 2887 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2888 free(sc->sc_rthash, M_DEVBUF); 2889 } 2890 2891 /* 2892 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2893 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2894 */ 2895 #define mix(a, b, c) \ 2896 do { \ 2897 a -= b; a -= c; a ^= (c >> 13); \ 2898 b -= c; b -= a; b ^= (a << 8); \ 2899 c -= a; c -= b; c ^= (b >> 13); \ 2900 a -= b; a -= c; a ^= (c >> 12); \ 2901 b -= c; b -= a; b ^= (a << 16); \ 2902 c -= a; c -= b; c ^= (b >> 5); \ 2903 a -= b; a -= c; a ^= (c >> 3); \ 2904 b -= c; b -= a; b ^= (a << 10); \ 2905 c -= a; c -= b; c ^= (b >> 15); \ 2906 } while (/*CONSTCOND*/0) 2907 2908 static __inline uint32_t 2909 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2910 { 2911 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2912 2913 b += addr[5] << 8; 2914 b += addr[4]; 2915 a += addr[3] << 24; 2916 a += addr[2] << 16; 2917 a += addr[1] << 8; 2918 a += addr[0]; 2919 2920 mix(a, b, c); 2921 2922 return (c & BRIDGE_RTHASH_MASK); 2923 } 2924 2925 #undef mix 2926 2927 static int 2928 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2929 { 2930 int i, d; 2931 2932 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2933 d = ((int)a[i]) - ((int)b[i]); 2934 } 2935 2936 return (d); 2937 } 2938 2939 /* 2940 * bridge_rtnode_lookup: 2941 * 2942 * Look up a bridge route node for the specified destination. Compare the 2943 * vlan id or if zero then just return the first match. 2944 */ 2945 static struct bridge_rtnode * 2946 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2947 { 2948 struct bridge_rtnode *brt; 2949 uint32_t hash; 2950 int dir; 2951 2952 BRIDGE_LOCK_ASSERT(sc); 2953 2954 hash = bridge_rthash(sc, addr); 2955 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2956 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2957 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2958 return (brt); 2959 if (dir > 0) 2960 return (NULL); 2961 } 2962 2963 return (NULL); 2964 } 2965 2966 /* 2967 * bridge_rtnode_insert: 2968 * 2969 * Insert the specified bridge node into the route table. We 2970 * assume the entry is not already in the table. 2971 */ 2972 static int 2973 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2974 { 2975 struct bridge_rtnode *lbrt; 2976 uint32_t hash; 2977 int dir; 2978 2979 BRIDGE_LOCK_ASSERT(sc); 2980 2981 hash = bridge_rthash(sc, brt->brt_addr); 2982 2983 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2984 if (lbrt == NULL) { 2985 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2986 goto out; 2987 } 2988 2989 do { 2990 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2991 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2992 return (EEXIST); 2993 if (dir > 0) { 2994 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2995 goto out; 2996 } 2997 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2998 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2999 goto out; 3000 } 3001 lbrt = LIST_NEXT(lbrt, brt_hash); 3002 } while (lbrt != NULL); 3003 3004 #ifdef DIAGNOSTIC 3005 panic("bridge_rtnode_insert: impossible"); 3006 #endif 3007 3008 out: 3009 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3010 sc->sc_brtcnt++; 3011 3012 return (0); 3013 } 3014 3015 /* 3016 * bridge_rtnode_destroy: 3017 * 3018 * Destroy a bridge rtnode. 3019 */ 3020 static void 3021 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3022 { 3023 BRIDGE_LOCK_ASSERT(sc); 3024 3025 LIST_REMOVE(brt, brt_hash); 3026 3027 LIST_REMOVE(brt, brt_list); 3028 sc->sc_brtcnt--; 3029 brt->brt_dst->bif_addrcnt--; 3030 uma_zfree(bridge_rtnode_zone, brt); 3031 } 3032 3033 /* 3034 * bridge_rtable_expire: 3035 * 3036 * Set the expiry time for all routes on an interface. 3037 */ 3038 static void 3039 bridge_rtable_expire(struct ifnet *ifp, int age) 3040 { 3041 struct bridge_softc *sc = ifp->if_bridge; 3042 struct bridge_rtnode *brt; 3043 3044 BRIDGE_LOCK(sc); 3045 3046 /* 3047 * If the age is zero then flush, otherwise set all the expiry times to 3048 * age for the interface 3049 */ 3050 if (age == 0) 3051 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3052 else { 3053 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3054 /* Cap the expiry time to 'age' */ 3055 if (brt->brt_ifp == ifp && 3056 brt->brt_expire > time_uptime + age && 3057 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3058 brt->brt_expire = time_uptime + age; 3059 } 3060 } 3061 BRIDGE_UNLOCK(sc); 3062 } 3063 3064 /* 3065 * bridge_state_change: 3066 * 3067 * Callback from the bridgestp code when a port changes states. 3068 */ 3069 static void 3070 bridge_state_change(struct ifnet *ifp, int state) 3071 { 3072 struct bridge_softc *sc = ifp->if_bridge; 3073 static const char *stpstates[] = { 3074 "disabled", 3075 "listening", 3076 "learning", 3077 "forwarding", 3078 "blocking", 3079 "discarding" 3080 }; 3081 3082 CURVNET_SET(ifp->if_vnet); 3083 if (V_log_stp) 3084 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3085 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3086 CURVNET_RESTORE(); 3087 } 3088 3089 /* 3090 * Send bridge packets through pfil if they are one of the types pfil can deal 3091 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3092 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3093 * that interface. 3094 */ 3095 static int 3096 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3097 { 3098 int snap, error, i, hlen; 3099 struct ether_header *eh1, eh2; 3100 struct ip *ip; 3101 struct llc llc1; 3102 u_int16_t ether_type; 3103 3104 snap = 0; 3105 error = -1; /* Default error if not error == 0 */ 3106 3107 #if 0 3108 /* we may return with the IP fields swapped, ensure its not shared */ 3109 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3110 #endif 3111 3112 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3113 return (0); /* filtering is disabled */ 3114 3115 i = min((*mp)->m_pkthdr.len, max_protohdr); 3116 if ((*mp)->m_len < i) { 3117 *mp = m_pullup(*mp, i); 3118 if (*mp == NULL) { 3119 printf("%s: m_pullup failed\n", __func__); 3120 return (-1); 3121 } 3122 } 3123 3124 eh1 = mtod(*mp, struct ether_header *); 3125 ether_type = ntohs(eh1->ether_type); 3126 3127 /* 3128 * Check for SNAP/LLC. 3129 */ 3130 if (ether_type < ETHERMTU) { 3131 struct llc *llc2 = (struct llc *)(eh1 + 1); 3132 3133 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3134 llc2->llc_dsap == LLC_SNAP_LSAP && 3135 llc2->llc_ssap == LLC_SNAP_LSAP && 3136 llc2->llc_control == LLC_UI) { 3137 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3138 snap = 1; 3139 } 3140 } 3141 3142 /* 3143 * If we're trying to filter bridge traffic, don't look at anything 3144 * other than IP and ARP traffic. If the filter doesn't understand 3145 * IPv6, don't allow IPv6 through the bridge either. This is lame 3146 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3147 * but of course we don't have an AppleTalk filter to begin with. 3148 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3149 * ARP traffic.) 3150 */ 3151 switch (ether_type) { 3152 case ETHERTYPE_ARP: 3153 case ETHERTYPE_REVARP: 3154 if (V_pfil_ipfw_arp == 0) 3155 return (0); /* Automatically pass */ 3156 break; 3157 3158 case ETHERTYPE_IP: 3159 #ifdef INET6 3160 case ETHERTYPE_IPV6: 3161 #endif /* INET6 */ 3162 break; 3163 default: 3164 /* 3165 * Check to see if the user wants to pass non-ip 3166 * packets, these will not be checked by pfil(9) and 3167 * passed unconditionally so the default is to drop. 3168 */ 3169 if (V_pfil_onlyip) 3170 goto bad; 3171 } 3172 3173 /* Run the packet through pfil before stripping link headers */ 3174 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 && 3175 dir == PFIL_OUT && ifp != NULL) { 3176 3177 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3178 3179 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3180 return (error); 3181 } 3182 3183 /* Strip off the Ethernet header and keep a copy. */ 3184 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3185 m_adj(*mp, ETHER_HDR_LEN); 3186 3187 /* Strip off snap header, if present */ 3188 if (snap) { 3189 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3190 m_adj(*mp, sizeof(struct llc)); 3191 } 3192 3193 /* 3194 * Check the IP header for alignment and errors 3195 */ 3196 if (dir == PFIL_IN) { 3197 switch (ether_type) { 3198 case ETHERTYPE_IP: 3199 error = bridge_ip_checkbasic(mp); 3200 break; 3201 #ifdef INET6 3202 case ETHERTYPE_IPV6: 3203 error = bridge_ip6_checkbasic(mp); 3204 break; 3205 #endif /* INET6 */ 3206 default: 3207 error = 0; 3208 } 3209 if (error) 3210 goto bad; 3211 } 3212 3213 error = 0; 3214 3215 /* 3216 * Run the packet through pfil 3217 */ 3218 switch (ether_type) { 3219 case ETHERTYPE_IP: 3220 /* 3221 * Run pfil on the member interface and the bridge, both can 3222 * be skipped by clearing pfil_member or pfil_bridge. 3223 * 3224 * Keep the order: 3225 * in_if -> bridge_if -> out_if 3226 */ 3227 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3228 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3229 dir, NULL); 3230 3231 if (*mp == NULL || error != 0) /* filter may consume */ 3232 break; 3233 3234 if (V_pfil_member && ifp != NULL) 3235 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3236 dir, NULL); 3237 3238 if (*mp == NULL || error != 0) /* filter may consume */ 3239 break; 3240 3241 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3242 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3243 dir, NULL); 3244 3245 if (*mp == NULL || error != 0) /* filter may consume */ 3246 break; 3247 3248 /* check if we need to fragment the packet */ 3249 /* bridge_fragment generates a mbuf chain of packets */ 3250 /* that already include eth headers */ 3251 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3252 i = (*mp)->m_pkthdr.len; 3253 if (i > ifp->if_mtu) { 3254 error = bridge_fragment(ifp, mp, &eh2, snap, 3255 &llc1); 3256 return (error); 3257 } 3258 } 3259 3260 /* Recalculate the ip checksum. */ 3261 ip = mtod(*mp, struct ip *); 3262 hlen = ip->ip_hl << 2; 3263 if (hlen < sizeof(struct ip)) 3264 goto bad; 3265 if (hlen > (*mp)->m_len) { 3266 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3267 goto bad; 3268 ip = mtod(*mp, struct ip *); 3269 if (ip == NULL) 3270 goto bad; 3271 } 3272 ip->ip_sum = 0; 3273 if (hlen == sizeof(struct ip)) 3274 ip->ip_sum = in_cksum_hdr(ip); 3275 else 3276 ip->ip_sum = in_cksum(*mp, hlen); 3277 3278 break; 3279 #ifdef INET6 3280 case ETHERTYPE_IPV6: 3281 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3282 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3283 dir, NULL); 3284 3285 if (*mp == NULL || error != 0) /* filter may consume */ 3286 break; 3287 3288 if (V_pfil_member && ifp != NULL) 3289 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3290 dir, NULL); 3291 3292 if (*mp == NULL || error != 0) /* filter may consume */ 3293 break; 3294 3295 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3296 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3297 dir, NULL); 3298 break; 3299 #endif 3300 default: 3301 error = 0; 3302 break; 3303 } 3304 3305 if (*mp == NULL) 3306 return (error); 3307 if (error != 0) 3308 goto bad; 3309 3310 error = -1; 3311 3312 /* 3313 * Finally, put everything back the way it was and return 3314 */ 3315 if (snap) { 3316 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3317 if (*mp == NULL) 3318 return (error); 3319 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3320 } 3321 3322 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3323 if (*mp == NULL) 3324 return (error); 3325 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3326 3327 return (0); 3328 3329 bad: 3330 m_freem(*mp); 3331 *mp = NULL; 3332 return (error); 3333 } 3334 3335 /* 3336 * Perform basic checks on header size since 3337 * pfil assumes ip_input has already processed 3338 * it for it. Cut-and-pasted from ip_input.c. 3339 * Given how simple the IPv6 version is, 3340 * does the IPv4 version really need to be 3341 * this complicated? 3342 * 3343 * XXX Should we update ipstat here, or not? 3344 * XXX Right now we update ipstat but not 3345 * XXX csum_counter. 3346 */ 3347 static int 3348 bridge_ip_checkbasic(struct mbuf **mp) 3349 { 3350 struct mbuf *m = *mp; 3351 struct ip *ip; 3352 int len, hlen; 3353 u_short sum; 3354 3355 if (*mp == NULL) 3356 return (-1); 3357 3358 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3359 if ((m = m_copyup(m, sizeof(struct ip), 3360 (max_linkhdr + 3) & ~3)) == NULL) { 3361 /* XXXJRT new stat, please */ 3362 KMOD_IPSTAT_INC(ips_toosmall); 3363 goto bad; 3364 } 3365 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3366 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3367 KMOD_IPSTAT_INC(ips_toosmall); 3368 goto bad; 3369 } 3370 } 3371 ip = mtod(m, struct ip *); 3372 if (ip == NULL) goto bad; 3373 3374 if (ip->ip_v != IPVERSION) { 3375 KMOD_IPSTAT_INC(ips_badvers); 3376 goto bad; 3377 } 3378 hlen = ip->ip_hl << 2; 3379 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3380 KMOD_IPSTAT_INC(ips_badhlen); 3381 goto bad; 3382 } 3383 if (hlen > m->m_len) { 3384 if ((m = m_pullup(m, hlen)) == NULL) { 3385 KMOD_IPSTAT_INC(ips_badhlen); 3386 goto bad; 3387 } 3388 ip = mtod(m, struct ip *); 3389 if (ip == NULL) goto bad; 3390 } 3391 3392 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3393 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3394 } else { 3395 if (hlen == sizeof(struct ip)) { 3396 sum = in_cksum_hdr(ip); 3397 } else { 3398 sum = in_cksum(m, hlen); 3399 } 3400 } 3401 if (sum) { 3402 KMOD_IPSTAT_INC(ips_badsum); 3403 goto bad; 3404 } 3405 3406 /* Retrieve the packet length. */ 3407 len = ntohs(ip->ip_len); 3408 3409 /* 3410 * Check for additional length bogosity 3411 */ 3412 if (len < hlen) { 3413 KMOD_IPSTAT_INC(ips_badlen); 3414 goto bad; 3415 } 3416 3417 /* 3418 * Check that the amount of data in the buffers 3419 * is as at least much as the IP header would have us expect. 3420 * Drop packet if shorter than we expect. 3421 */ 3422 if (m->m_pkthdr.len < len) { 3423 KMOD_IPSTAT_INC(ips_tooshort); 3424 goto bad; 3425 } 3426 3427 /* Checks out, proceed */ 3428 *mp = m; 3429 return (0); 3430 3431 bad: 3432 *mp = m; 3433 return (-1); 3434 } 3435 3436 #ifdef INET6 3437 /* 3438 * Same as above, but for IPv6. 3439 * Cut-and-pasted from ip6_input.c. 3440 * XXX Should we update ip6stat, or not? 3441 */ 3442 static int 3443 bridge_ip6_checkbasic(struct mbuf **mp) 3444 { 3445 struct mbuf *m = *mp; 3446 struct ip6_hdr *ip6; 3447 3448 /* 3449 * If the IPv6 header is not aligned, slurp it up into a new 3450 * mbuf with space for link headers, in the event we forward 3451 * it. Otherwise, if it is aligned, make sure the entire base 3452 * IPv6 header is in the first mbuf of the chain. 3453 */ 3454 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3455 struct ifnet *inifp = m->m_pkthdr.rcvif; 3456 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3457 (max_linkhdr + 3) & ~3)) == NULL) { 3458 /* XXXJRT new stat, please */ 3459 IP6STAT_INC(ip6s_toosmall); 3460 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3461 goto bad; 3462 } 3463 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3464 struct ifnet *inifp = m->m_pkthdr.rcvif; 3465 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3466 IP6STAT_INC(ip6s_toosmall); 3467 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3468 goto bad; 3469 } 3470 } 3471 3472 ip6 = mtod(m, struct ip6_hdr *); 3473 3474 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3475 IP6STAT_INC(ip6s_badvers); 3476 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3477 goto bad; 3478 } 3479 3480 /* Checks out, proceed */ 3481 *mp = m; 3482 return (0); 3483 3484 bad: 3485 *mp = m; 3486 return (-1); 3487 } 3488 #endif /* INET6 */ 3489 3490 /* 3491 * bridge_fragment: 3492 * 3493 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3494 */ 3495 static int 3496 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3497 int snap, struct llc *llc) 3498 { 3499 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3500 struct ip *ip; 3501 int error = -1; 3502 3503 if (m->m_len < sizeof(struct ip) && 3504 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3505 goto dropit; 3506 ip = mtod(m, struct ip *); 3507 3508 m->m_pkthdr.csum_flags |= CSUM_IP; 3509 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3510 if (error) 3511 goto dropit; 3512 3513 /* 3514 * Walk the chain and re-add the Ethernet header for 3515 * each mbuf packet. 3516 */ 3517 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3518 nextpkt = mcur->m_nextpkt; 3519 mcur->m_nextpkt = NULL; 3520 if (snap) { 3521 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3522 if (mcur == NULL) { 3523 error = ENOBUFS; 3524 if (mprev != NULL) 3525 mprev->m_nextpkt = nextpkt; 3526 goto dropit; 3527 } 3528 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3529 } 3530 3531 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3532 if (mcur == NULL) { 3533 error = ENOBUFS; 3534 if (mprev != NULL) 3535 mprev->m_nextpkt = nextpkt; 3536 goto dropit; 3537 } 3538 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3539 3540 /* 3541 * The previous two M_PREPEND could have inserted one or two 3542 * mbufs in front so we have to update the previous packet's 3543 * m_nextpkt. 3544 */ 3545 mcur->m_nextpkt = nextpkt; 3546 if (mprev != NULL) 3547 mprev->m_nextpkt = mcur; 3548 else { 3549 /* The first mbuf in the original chain needs to be 3550 * updated. */ 3551 *mp = mcur; 3552 } 3553 mprev = mcur; 3554 } 3555 3556 KMOD_IPSTAT_INC(ips_fragmented); 3557 return (error); 3558 3559 dropit: 3560 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3561 m = mcur->m_nextpkt; 3562 m_freem(mcur); 3563 } 3564 return (error); 3565 } 3566 3567 static void 3568 bridge_linkstate(struct ifnet *ifp) 3569 { 3570 struct bridge_softc *sc = ifp->if_bridge; 3571 struct bridge_iflist *bif; 3572 3573 BRIDGE_LOCK(sc); 3574 bif = bridge_lookup_member_if(sc, ifp); 3575 if (bif == NULL) { 3576 BRIDGE_UNLOCK(sc); 3577 return; 3578 } 3579 bridge_linkcheck(sc); 3580 BRIDGE_UNLOCK(sc); 3581 3582 bstp_linkstate(&bif->bif_stp); 3583 } 3584 3585 static void 3586 bridge_linkcheck(struct bridge_softc *sc) 3587 { 3588 struct bridge_iflist *bif; 3589 int new_link, hasls; 3590 3591 BRIDGE_LOCK_ASSERT(sc); 3592 new_link = LINK_STATE_DOWN; 3593 hasls = 0; 3594 /* Our link is considered up if at least one of our ports is active */ 3595 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3596 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3597 hasls++; 3598 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3599 new_link = LINK_STATE_UP; 3600 break; 3601 } 3602 } 3603 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3604 /* If no interfaces support link-state then we default to up */ 3605 new_link = LINK_STATE_UP; 3606 } 3607 if_link_state_change(sc->sc_ifp, new_link); 3608 } 3609