1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (FDDI-FDDI, and maybe 76 * consider heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/pfil.h> 114 #include <net/vnet.h> 115 116 #include <netinet/in.h> 117 #include <netinet/in_systm.h> 118 #include <netinet/in_var.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #ifdef INET6 122 #include <netinet/ip6.h> 123 #include <netinet6/ip6_var.h> 124 #include <netinet6/in6_ifattach.h> 125 #endif 126 #if defined(INET) || defined(INET6) 127 #include <netinet/ip_carp.h> 128 #endif 129 #include <machine/in_cksum.h> 130 #include <netinet/if_ether.h> 131 #include <net/bridgestp.h> 132 #include <net/if_bridgevar.h> 133 #include <net/if_llc.h> 134 #include <net/if_vlan_var.h> 135 136 #include <net/route.h> 137 138 /* 139 * Size of the route hash table. Must be a power of two. 140 */ 141 #ifndef BRIDGE_RTHASH_SIZE 142 #define BRIDGE_RTHASH_SIZE 1024 143 #endif 144 145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 146 147 /* 148 * Default maximum number of addresses to cache. 149 */ 150 #ifndef BRIDGE_RTABLE_MAX 151 #define BRIDGE_RTABLE_MAX 2000 152 #endif 153 154 /* 155 * Timeout (in seconds) for entries learned dynamically. 156 */ 157 #ifndef BRIDGE_RTABLE_TIMEOUT 158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 159 #endif 160 161 /* 162 * Number of seconds between walks of the route list. 163 */ 164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 166 #endif 167 168 /* 169 * List of capabilities to possibly mask on the member interface. 170 */ 171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 172 IFCAP_TXCSUM_IPV6) 173 174 /* 175 * List of capabilities to strip 176 */ 177 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 178 179 /* 180 * Bridge interface list entry. 181 */ 182 struct bridge_iflist { 183 LIST_ENTRY(bridge_iflist) bif_next; 184 struct ifnet *bif_ifp; /* member if */ 185 struct bstp_port bif_stp; /* STP state */ 186 uint32_t bif_flags; /* member if flags */ 187 int bif_savedcaps; /* saved capabilities */ 188 uint32_t bif_addrmax; /* max # of addresses */ 189 uint32_t bif_addrcnt; /* cur. # of addresses */ 190 uint32_t bif_addrexceeded;/* # of address violations */ 191 }; 192 193 /* 194 * Bridge route node. 195 */ 196 struct bridge_rtnode { 197 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 198 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 199 struct bridge_iflist *brt_dst; /* destination if */ 200 unsigned long brt_expire; /* expiration time */ 201 uint8_t brt_flags; /* address flags */ 202 uint8_t brt_addr[ETHER_ADDR_LEN]; 203 uint16_t brt_vlan; /* vlan id */ 204 }; 205 #define brt_ifp brt_dst->bif_ifp 206 207 /* 208 * Software state for each bridge. 209 */ 210 struct bridge_softc { 211 struct ifnet *sc_ifp; /* make this an interface */ 212 LIST_ENTRY(bridge_softc) sc_list; 213 struct mtx sc_mtx; 214 struct cv sc_cv; 215 uint32_t sc_brtmax; /* max # of addresses */ 216 uint32_t sc_brtcnt; /* cur. # of addresses */ 217 uint32_t sc_brttimeout; /* rt timeout in seconds */ 218 struct callout sc_brcallout; /* bridge callout */ 219 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 220 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 221 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 222 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 223 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 224 uint32_t sc_rthash_key; /* key for hash */ 225 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 226 struct bstp_state sc_stp; /* STP state */ 227 uint32_t sc_brtexceeded; /* # of cache drops */ 228 struct ifnet *sc_ifaddr; /* member mac copied from */ 229 u_char sc_defaddr[6]; /* Default MAC address */ 230 }; 231 232 static VNET_DEFINE(struct mtx, bridge_list_mtx); 233 #define V_bridge_list_mtx VNET(bridge_list_mtx) 234 static eventhandler_tag bridge_detach_cookie; 235 236 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 237 238 uma_zone_t bridge_rtnode_zone; 239 240 static int bridge_clone_create(struct if_clone *, int, caddr_t); 241 static void bridge_clone_destroy(struct ifnet *); 242 243 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 244 static void bridge_mutecaps(struct bridge_softc *); 245 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 246 int); 247 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 248 static void bridge_init(void *); 249 static void bridge_dummynet(struct mbuf *, struct ifnet *); 250 static void bridge_stop(struct ifnet *, int); 251 static int bridge_transmit(struct ifnet *, struct mbuf *); 252 static void bridge_qflush(struct ifnet *); 253 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 254 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 255 struct rtentry *); 256 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 257 struct mbuf *); 258 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 259 260 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 261 struct mbuf *m); 262 263 static void bridge_timer(void *); 264 265 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 266 struct mbuf *, int); 267 static void bridge_span(struct bridge_softc *, struct mbuf *); 268 269 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 270 uint16_t, struct bridge_iflist *, int, uint8_t); 271 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 272 uint16_t); 273 static void bridge_rttrim(struct bridge_softc *); 274 static void bridge_rtage(struct bridge_softc *); 275 static void bridge_rtflush(struct bridge_softc *, int); 276 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 277 uint16_t); 278 279 static void bridge_rtable_init(struct bridge_softc *); 280 static void bridge_rtable_fini(struct bridge_softc *); 281 282 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 283 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 284 const uint8_t *, uint16_t); 285 static int bridge_rtnode_insert(struct bridge_softc *, 286 struct bridge_rtnode *); 287 static void bridge_rtnode_destroy(struct bridge_softc *, 288 struct bridge_rtnode *); 289 static void bridge_rtable_expire(struct ifnet *, int); 290 static void bridge_state_change(struct ifnet *, int); 291 292 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 293 const char *name); 294 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 295 struct ifnet *ifp); 296 static void bridge_delete_member(struct bridge_softc *, 297 struct bridge_iflist *, int); 298 static void bridge_delete_span(struct bridge_softc *, 299 struct bridge_iflist *); 300 301 static int bridge_ioctl_add(struct bridge_softc *, void *); 302 static int bridge_ioctl_del(struct bridge_softc *, void *); 303 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 304 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 305 static int bridge_ioctl_scache(struct bridge_softc *, void *); 306 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 307 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 308 static int bridge_ioctl_rts(struct bridge_softc *, void *); 309 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 310 static int bridge_ioctl_sto(struct bridge_softc *, void *); 311 static int bridge_ioctl_gto(struct bridge_softc *, void *); 312 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 313 static int bridge_ioctl_flush(struct bridge_softc *, void *); 314 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 315 static int bridge_ioctl_spri(struct bridge_softc *, void *); 316 static int bridge_ioctl_ght(struct bridge_softc *, void *); 317 static int bridge_ioctl_sht(struct bridge_softc *, void *); 318 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 319 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 320 static int bridge_ioctl_gma(struct bridge_softc *, void *); 321 static int bridge_ioctl_sma(struct bridge_softc *, void *); 322 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 323 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 324 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 325 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 326 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 327 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 328 static int bridge_ioctl_grte(struct bridge_softc *, void *); 329 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 330 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 331 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 332 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 333 int); 334 static int bridge_ip_checkbasic(struct mbuf **mp); 335 #ifdef INET6 336 static int bridge_ip6_checkbasic(struct mbuf **mp); 337 #endif /* INET6 */ 338 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 339 struct ether_header *, int, struct llc *); 340 static void bridge_linkstate(struct ifnet *ifp); 341 static void bridge_linkcheck(struct bridge_softc *sc); 342 343 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 344 345 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 346 #define VLANTAGOF(_m) \ 347 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 348 349 static struct bstp_cb_ops bridge_ops = { 350 .bcb_state = bridge_state_change, 351 .bcb_rtage = bridge_rtable_expire 352 }; 353 354 SYSCTL_DECL(_net_link); 355 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 356 357 /* only pass IP[46] packets when pfil is enabled */ 358 static VNET_DEFINE(int, pfil_onlyip) = 1; 359 #define V_pfil_onlyip VNET(pfil_onlyip) 360 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 361 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 362 "Only pass IP packets when pfil is enabled"); 363 364 /* run pfil hooks on the bridge interface */ 365 static VNET_DEFINE(int, pfil_bridge) = 1; 366 #define V_pfil_bridge VNET(pfil_bridge) 367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 368 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 369 "Packet filter on the bridge interface"); 370 371 /* layer2 filter with ipfw */ 372 static VNET_DEFINE(int, pfil_ipfw); 373 #define V_pfil_ipfw VNET(pfil_ipfw) 374 375 /* layer2 ARP filter with ipfw */ 376 static VNET_DEFINE(int, pfil_ipfw_arp); 377 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 378 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 379 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 380 "Filter ARP packets through IPFW layer2"); 381 382 /* run pfil hooks on the member interface */ 383 static VNET_DEFINE(int, pfil_member) = 1; 384 #define V_pfil_member VNET(pfil_member) 385 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 386 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 387 "Packet filter on the member interface"); 388 389 /* run pfil hooks on the physical interface for locally destined packets */ 390 static VNET_DEFINE(int, pfil_local_phys); 391 #define V_pfil_local_phys VNET(pfil_local_phys) 392 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 393 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 394 "Packet filter on the physical interface for locally destined packets"); 395 396 /* log STP state changes */ 397 static VNET_DEFINE(int, log_stp); 398 #define V_log_stp VNET(log_stp) 399 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 400 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 401 "Log STP state changes"); 402 403 /* share MAC with first bridge member */ 404 static VNET_DEFINE(int, bridge_inherit_mac); 405 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 406 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 407 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 408 "Inherit MAC address from the first bridge member"); 409 410 static VNET_DEFINE(int, allow_llz_overlap) = 0; 411 #define V_allow_llz_overlap VNET(allow_llz_overlap) 412 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 413 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 414 "Allow overlap of link-local scope " 415 "zones of a bridge interface and the member interfaces"); 416 417 struct bridge_control { 418 int (*bc_func)(struct bridge_softc *, void *); 419 int bc_argsize; 420 int bc_flags; 421 }; 422 423 #define BC_F_COPYIN 0x01 /* copy arguments in */ 424 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 425 #define BC_F_SUSER 0x04 /* do super-user check */ 426 427 const struct bridge_control bridge_control_table[] = { 428 { bridge_ioctl_add, sizeof(struct ifbreq), 429 BC_F_COPYIN|BC_F_SUSER }, 430 { bridge_ioctl_del, sizeof(struct ifbreq), 431 BC_F_COPYIN|BC_F_SUSER }, 432 433 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 434 BC_F_COPYIN|BC_F_COPYOUT }, 435 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 436 BC_F_COPYIN|BC_F_SUSER }, 437 438 { bridge_ioctl_scache, sizeof(struct ifbrparam), 439 BC_F_COPYIN|BC_F_SUSER }, 440 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 441 BC_F_COPYOUT }, 442 443 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 444 BC_F_COPYIN|BC_F_COPYOUT }, 445 { bridge_ioctl_rts, sizeof(struct ifbaconf), 446 BC_F_COPYIN|BC_F_COPYOUT }, 447 448 { bridge_ioctl_saddr, sizeof(struct ifbareq), 449 BC_F_COPYIN|BC_F_SUSER }, 450 451 { bridge_ioctl_sto, sizeof(struct ifbrparam), 452 BC_F_COPYIN|BC_F_SUSER }, 453 { bridge_ioctl_gto, sizeof(struct ifbrparam), 454 BC_F_COPYOUT }, 455 456 { bridge_ioctl_daddr, sizeof(struct ifbareq), 457 BC_F_COPYIN|BC_F_SUSER }, 458 459 { bridge_ioctl_flush, sizeof(struct ifbreq), 460 BC_F_COPYIN|BC_F_SUSER }, 461 462 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 463 BC_F_COPYOUT }, 464 { bridge_ioctl_spri, sizeof(struct ifbrparam), 465 BC_F_COPYIN|BC_F_SUSER }, 466 467 { bridge_ioctl_ght, sizeof(struct ifbrparam), 468 BC_F_COPYOUT }, 469 { bridge_ioctl_sht, sizeof(struct ifbrparam), 470 BC_F_COPYIN|BC_F_SUSER }, 471 472 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 473 BC_F_COPYOUT }, 474 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 475 BC_F_COPYIN|BC_F_SUSER }, 476 477 { bridge_ioctl_gma, sizeof(struct ifbrparam), 478 BC_F_COPYOUT }, 479 { bridge_ioctl_sma, sizeof(struct ifbrparam), 480 BC_F_COPYIN|BC_F_SUSER }, 481 482 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 483 BC_F_COPYIN|BC_F_SUSER }, 484 485 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 486 BC_F_COPYIN|BC_F_SUSER }, 487 488 { bridge_ioctl_addspan, sizeof(struct ifbreq), 489 BC_F_COPYIN|BC_F_SUSER }, 490 { bridge_ioctl_delspan, sizeof(struct ifbreq), 491 BC_F_COPYIN|BC_F_SUSER }, 492 493 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 494 BC_F_COPYOUT }, 495 496 { bridge_ioctl_grte, sizeof(struct ifbrparam), 497 BC_F_COPYOUT }, 498 499 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 500 BC_F_COPYIN|BC_F_COPYOUT }, 501 502 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 503 BC_F_COPYIN|BC_F_SUSER }, 504 505 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 506 BC_F_COPYIN|BC_F_SUSER }, 507 508 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 509 BC_F_COPYIN|BC_F_SUSER }, 510 511 }; 512 const int bridge_control_table_size = nitems(bridge_control_table); 513 514 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list); 515 #define V_bridge_list VNET(bridge_list) 516 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \ 517 "if_bridge list", NULL, MTX_DEF) 518 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx) 519 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx) 520 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx) 521 522 static VNET_DEFINE(struct if_clone *, bridge_cloner); 523 #define V_bridge_cloner VNET(bridge_cloner) 524 525 static const char bridge_name[] = "bridge"; 526 527 static void 528 vnet_bridge_init(const void *unused __unused) 529 { 530 531 BRIDGE_LIST_LOCK_INIT(); 532 LIST_INIT(&V_bridge_list); 533 V_bridge_cloner = if_clone_simple(bridge_name, 534 bridge_clone_create, bridge_clone_destroy, 0); 535 } 536 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 537 vnet_bridge_init, NULL); 538 539 static void 540 vnet_bridge_uninit(const void *unused __unused) 541 { 542 543 if_clone_detach(V_bridge_cloner); 544 V_bridge_cloner = NULL; 545 BRIDGE_LIST_LOCK_DESTROY(); 546 } 547 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 548 vnet_bridge_uninit, NULL); 549 550 static int 551 bridge_modevent(module_t mod, int type, void *data) 552 { 553 554 switch (type) { 555 case MOD_LOAD: 556 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 557 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 558 UMA_ALIGN_PTR, 0); 559 bridge_input_p = bridge_input; 560 bridge_output_p = bridge_output; 561 bridge_dn_p = bridge_dummynet; 562 bridge_linkstate_p = bridge_linkstate; 563 bridge_detach_cookie = EVENTHANDLER_REGISTER( 564 ifnet_departure_event, bridge_ifdetach, NULL, 565 EVENTHANDLER_PRI_ANY); 566 break; 567 case MOD_UNLOAD: 568 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 569 bridge_detach_cookie); 570 uma_zdestroy(bridge_rtnode_zone); 571 bridge_input_p = NULL; 572 bridge_output_p = NULL; 573 bridge_dn_p = NULL; 574 bridge_linkstate_p = NULL; 575 break; 576 default: 577 return (EOPNOTSUPP); 578 } 579 return (0); 580 } 581 582 static moduledata_t bridge_mod = { 583 "if_bridge", 584 bridge_modevent, 585 0 586 }; 587 588 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 589 MODULE_VERSION(if_bridge, 1); 590 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 591 592 /* 593 * handler for net.link.bridge.ipfw 594 */ 595 static int 596 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 597 { 598 int enable = V_pfil_ipfw; 599 int error; 600 601 error = sysctl_handle_int(oidp, &enable, 0, req); 602 enable &= 1; 603 604 if (enable != V_pfil_ipfw) { 605 V_pfil_ipfw = enable; 606 607 /* 608 * Disable pfil so that ipfw doesnt run twice, if the user 609 * really wants both then they can re-enable pfil_bridge and/or 610 * pfil_member. Also allow non-ip packets as ipfw can filter by 611 * layer2 type. 612 */ 613 if (V_pfil_ipfw) { 614 V_pfil_onlyip = 0; 615 V_pfil_bridge = 0; 616 V_pfil_member = 0; 617 } 618 } 619 620 return (error); 621 } 622 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 623 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET, 624 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 625 "Layer2 filter with IPFW"); 626 627 /* 628 * bridge_clone_create: 629 * 630 * Create a new bridge instance. 631 */ 632 static int 633 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 634 { 635 struct bridge_softc *sc, *sc2; 636 struct ifnet *bifp, *ifp; 637 int fb, retry; 638 unsigned long hostid; 639 640 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 641 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 642 if (ifp == NULL) { 643 free(sc, M_DEVBUF); 644 return (ENOSPC); 645 } 646 647 BRIDGE_LOCK_INIT(sc); 648 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 649 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 650 651 /* Initialize our routing table. */ 652 bridge_rtable_init(sc); 653 654 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 655 656 LIST_INIT(&sc->sc_iflist); 657 LIST_INIT(&sc->sc_spanlist); 658 659 ifp->if_softc = sc; 660 if_initname(ifp, bridge_name, unit); 661 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 662 ifp->if_ioctl = bridge_ioctl; 663 ifp->if_transmit = bridge_transmit; 664 ifp->if_qflush = bridge_qflush; 665 ifp->if_init = bridge_init; 666 ifp->if_type = IFT_BRIDGE; 667 668 /* 669 * Generate an ethernet address with a locally administered address. 670 * 671 * Since we are using random ethernet addresses for the bridge, it is 672 * possible that we might have address collisions, so make sure that 673 * this hardware address isn't already in use on another bridge. 674 * The first try uses the hostid and falls back to arc4rand(). 675 */ 676 fb = 0; 677 getcredhostid(curthread->td_ucred, &hostid); 678 do { 679 if (fb || hostid == 0) { 680 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 681 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 682 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 683 } else { 684 sc->sc_defaddr[0] = 0x2; 685 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 686 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 687 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 688 sc->sc_defaddr[4] = hostid & 0xff; 689 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 690 } 691 692 fb = 1; 693 retry = 0; 694 BRIDGE_LIST_LOCK(); 695 LIST_FOREACH(sc2, &V_bridge_list, sc_list) { 696 bifp = sc2->sc_ifp; 697 if (memcmp(sc->sc_defaddr, 698 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 699 retry = 1; 700 break; 701 } 702 } 703 BRIDGE_LIST_UNLOCK(); 704 } while (retry == 1); 705 706 bstp_attach(&sc->sc_stp, &bridge_ops); 707 ether_ifattach(ifp, sc->sc_defaddr); 708 /* Now undo some of the damage... */ 709 ifp->if_baudrate = 0; 710 ifp->if_type = IFT_BRIDGE; 711 712 BRIDGE_LIST_LOCK(); 713 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 714 BRIDGE_LIST_UNLOCK(); 715 716 return (0); 717 } 718 719 /* 720 * bridge_clone_destroy: 721 * 722 * Destroy a bridge instance. 723 */ 724 static void 725 bridge_clone_destroy(struct ifnet *ifp) 726 { 727 struct bridge_softc *sc = ifp->if_softc; 728 struct bridge_iflist *bif; 729 730 BRIDGE_LOCK(sc); 731 732 bridge_stop(ifp, 1); 733 ifp->if_flags &= ~IFF_UP; 734 735 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 736 bridge_delete_member(sc, bif, 0); 737 738 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 739 bridge_delete_span(sc, bif); 740 } 741 742 BRIDGE_UNLOCK(sc); 743 744 callout_drain(&sc->sc_brcallout); 745 746 BRIDGE_LIST_LOCK(); 747 LIST_REMOVE(sc, sc_list); 748 BRIDGE_LIST_UNLOCK(); 749 750 bstp_detach(&sc->sc_stp); 751 ether_ifdetach(ifp); 752 if_free(ifp); 753 754 /* Tear down the routing table. */ 755 bridge_rtable_fini(sc); 756 757 BRIDGE_LOCK_DESTROY(sc); 758 free(sc, M_DEVBUF); 759 } 760 761 /* 762 * bridge_ioctl: 763 * 764 * Handle a control request from the operator. 765 */ 766 static int 767 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 768 { 769 struct bridge_softc *sc = ifp->if_softc; 770 struct ifreq *ifr = (struct ifreq *)data; 771 struct bridge_iflist *bif; 772 struct thread *td = curthread; 773 union { 774 struct ifbreq ifbreq; 775 struct ifbifconf ifbifconf; 776 struct ifbareq ifbareq; 777 struct ifbaconf ifbaconf; 778 struct ifbrparam ifbrparam; 779 struct ifbropreq ifbropreq; 780 } args; 781 struct ifdrv *ifd = (struct ifdrv *) data; 782 const struct bridge_control *bc; 783 int error = 0; 784 785 switch (cmd) { 786 787 case SIOCADDMULTI: 788 case SIOCDELMULTI: 789 break; 790 791 case SIOCGDRVSPEC: 792 case SIOCSDRVSPEC: 793 if (ifd->ifd_cmd >= bridge_control_table_size) { 794 error = EINVAL; 795 break; 796 } 797 bc = &bridge_control_table[ifd->ifd_cmd]; 798 799 if (cmd == SIOCGDRVSPEC && 800 (bc->bc_flags & BC_F_COPYOUT) == 0) { 801 error = EINVAL; 802 break; 803 } 804 else if (cmd == SIOCSDRVSPEC && 805 (bc->bc_flags & BC_F_COPYOUT) != 0) { 806 error = EINVAL; 807 break; 808 } 809 810 if (bc->bc_flags & BC_F_SUSER) { 811 error = priv_check(td, PRIV_NET_BRIDGE); 812 if (error) 813 break; 814 } 815 816 if (ifd->ifd_len != bc->bc_argsize || 817 ifd->ifd_len > sizeof(args)) { 818 error = EINVAL; 819 break; 820 } 821 822 bzero(&args, sizeof(args)); 823 if (bc->bc_flags & BC_F_COPYIN) { 824 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 825 if (error) 826 break; 827 } 828 829 BRIDGE_LOCK(sc); 830 error = (*bc->bc_func)(sc, &args); 831 BRIDGE_UNLOCK(sc); 832 if (error) 833 break; 834 835 if (bc->bc_flags & BC_F_COPYOUT) 836 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 837 838 break; 839 840 case SIOCSIFFLAGS: 841 if (!(ifp->if_flags & IFF_UP) && 842 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 843 /* 844 * If interface is marked down and it is running, 845 * then stop and disable it. 846 */ 847 BRIDGE_LOCK(sc); 848 bridge_stop(ifp, 1); 849 BRIDGE_UNLOCK(sc); 850 } else if ((ifp->if_flags & IFF_UP) && 851 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 852 /* 853 * If interface is marked up and it is stopped, then 854 * start it. 855 */ 856 (*ifp->if_init)(sc); 857 } 858 break; 859 860 case SIOCSIFMTU: 861 if (ifr->ifr_mtu < 576) { 862 error = EINVAL; 863 break; 864 } 865 if (LIST_EMPTY(&sc->sc_iflist)) { 866 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 867 break; 868 } 869 BRIDGE_LOCK(sc); 870 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 871 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 872 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 873 " != %d\n", sc->sc_ifp->if_xname, 874 bif->bif_ifp->if_mtu, 875 bif->bif_ifp->if_xname, ifr->ifr_mtu); 876 error = EINVAL; 877 break; 878 } 879 } 880 if (!error) 881 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 882 BRIDGE_UNLOCK(sc); 883 break; 884 default: 885 /* 886 * drop the lock as ether_ioctl() will call bridge_start() and 887 * cause the lock to be recursed. 888 */ 889 error = ether_ioctl(ifp, cmd, data); 890 break; 891 } 892 893 return (error); 894 } 895 896 /* 897 * bridge_mutecaps: 898 * 899 * Clear or restore unwanted capabilities on the member interface 900 */ 901 static void 902 bridge_mutecaps(struct bridge_softc *sc) 903 { 904 struct bridge_iflist *bif; 905 int enabled, mask; 906 907 /* Initial bitmask of capabilities to test */ 908 mask = BRIDGE_IFCAPS_MASK; 909 910 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 911 /* Every member must support it or its disabled */ 912 mask &= bif->bif_savedcaps; 913 } 914 915 BRIDGE_XLOCK(sc); 916 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 917 enabled = bif->bif_ifp->if_capenable; 918 enabled &= ~BRIDGE_IFCAPS_STRIP; 919 /* strip off mask bits and enable them again if allowed */ 920 enabled &= ~BRIDGE_IFCAPS_MASK; 921 enabled |= mask; 922 BRIDGE_UNLOCK(sc); 923 bridge_set_ifcap(sc, bif, enabled); 924 BRIDGE_LOCK(sc); 925 } 926 BRIDGE_XDROP(sc); 927 928 } 929 930 static void 931 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 932 { 933 struct ifnet *ifp = bif->bif_ifp; 934 struct ifreq ifr; 935 int error; 936 937 BRIDGE_UNLOCK_ASSERT(sc); 938 939 bzero(&ifr, sizeof(ifr)); 940 ifr.ifr_reqcap = set; 941 942 if (ifp->if_capenable != set) { 943 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 944 if (error) 945 if_printf(sc->sc_ifp, 946 "error setting capabilities on %s: %d\n", 947 ifp->if_xname, error); 948 if ((ifp->if_capenable & ~set) != 0) 949 if_printf(sc->sc_ifp, 950 "can't disable some capabilities on %s: 0x%x\n", 951 ifp->if_xname, ifp->if_capenable & ~set); 952 } 953 } 954 955 /* 956 * bridge_lookup_member: 957 * 958 * Lookup a bridge member interface. 959 */ 960 static struct bridge_iflist * 961 bridge_lookup_member(struct bridge_softc *sc, const char *name) 962 { 963 struct bridge_iflist *bif; 964 struct ifnet *ifp; 965 966 BRIDGE_LOCK_ASSERT(sc); 967 968 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 969 ifp = bif->bif_ifp; 970 if (strcmp(ifp->if_xname, name) == 0) 971 return (bif); 972 } 973 974 return (NULL); 975 } 976 977 /* 978 * bridge_lookup_member_if: 979 * 980 * Lookup a bridge member interface by ifnet*. 981 */ 982 static struct bridge_iflist * 983 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 984 { 985 struct bridge_iflist *bif; 986 987 BRIDGE_LOCK_ASSERT(sc); 988 989 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 990 if (bif->bif_ifp == member_ifp) 991 return (bif); 992 } 993 994 return (NULL); 995 } 996 997 /* 998 * bridge_delete_member: 999 * 1000 * Delete the specified member interface. 1001 */ 1002 static void 1003 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1004 int gone) 1005 { 1006 struct ifnet *ifs = bif->bif_ifp; 1007 struct ifnet *fif = NULL; 1008 1009 BRIDGE_LOCK_ASSERT(sc); 1010 1011 if (bif->bif_flags & IFBIF_STP) 1012 bstp_disable(&bif->bif_stp); 1013 1014 ifs->if_bridge = NULL; 1015 BRIDGE_XLOCK(sc); 1016 LIST_REMOVE(bif, bif_next); 1017 BRIDGE_XDROP(sc); 1018 1019 /* 1020 * If removing the interface that gave the bridge its mac address, set 1021 * the mac address of the bridge to the address of the next member, or 1022 * to its default address if no members are left. 1023 */ 1024 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1025 if (LIST_EMPTY(&sc->sc_iflist)) { 1026 bcopy(sc->sc_defaddr, 1027 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1028 sc->sc_ifaddr = NULL; 1029 } else { 1030 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 1031 bcopy(IF_LLADDR(fif), 1032 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1033 sc->sc_ifaddr = fif; 1034 } 1035 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1036 } 1037 1038 bridge_linkcheck(sc); 1039 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1040 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1041 KASSERT(bif->bif_addrcnt == 0, 1042 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1043 1044 BRIDGE_UNLOCK(sc); 1045 if (!gone) { 1046 switch (ifs->if_type) { 1047 case IFT_ETHER: 1048 case IFT_L2VLAN: 1049 /* 1050 * Take the interface out of promiscuous mode, but only 1051 * if it was promiscuous in the first place. It might 1052 * not be if we're in the bridge_ioctl_add() error path. 1053 */ 1054 if (ifs->if_flags & IFF_PROMISC) 1055 (void) ifpromisc(ifs, 0); 1056 break; 1057 1058 case IFT_GIF: 1059 break; 1060 1061 default: 1062 #ifdef DIAGNOSTIC 1063 panic("bridge_delete_member: impossible"); 1064 #endif 1065 break; 1066 } 1067 /* reneable any interface capabilities */ 1068 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1069 } 1070 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1071 BRIDGE_LOCK(sc); 1072 free(bif, M_DEVBUF); 1073 } 1074 1075 /* 1076 * bridge_delete_span: 1077 * 1078 * Delete the specified span interface. 1079 */ 1080 static void 1081 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1082 { 1083 BRIDGE_LOCK_ASSERT(sc); 1084 1085 KASSERT(bif->bif_ifp->if_bridge == NULL, 1086 ("%s: not a span interface", __func__)); 1087 1088 LIST_REMOVE(bif, bif_next); 1089 free(bif, M_DEVBUF); 1090 } 1091 1092 static int 1093 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1094 { 1095 struct ifbreq *req = arg; 1096 struct bridge_iflist *bif = NULL; 1097 struct ifnet *ifs; 1098 int error = 0; 1099 1100 ifs = ifunit(req->ifbr_ifsname); 1101 if (ifs == NULL) 1102 return (ENOENT); 1103 if (ifs->if_ioctl == NULL) /* must be supported */ 1104 return (EINVAL); 1105 1106 /* If it's in the span list, it can't be a member. */ 1107 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1108 if (ifs == bif->bif_ifp) 1109 return (EBUSY); 1110 1111 if (ifs->if_bridge == sc) 1112 return (EEXIST); 1113 1114 if (ifs->if_bridge != NULL) 1115 return (EBUSY); 1116 1117 switch (ifs->if_type) { 1118 case IFT_ETHER: 1119 case IFT_L2VLAN: 1120 case IFT_GIF: 1121 /* permitted interface types */ 1122 break; 1123 default: 1124 return (EINVAL); 1125 } 1126 1127 #ifdef INET6 1128 /* 1129 * Two valid inet6 addresses with link-local scope must not be 1130 * on the parent interface and the member interfaces at the 1131 * same time. This restriction is needed to prevent violation 1132 * of link-local scope zone. Attempts to add a member 1133 * interface which has inet6 addresses when the parent has 1134 * inet6 triggers removal of all inet6 addresses on the member 1135 * interface. 1136 */ 1137 1138 /* Check if the parent interface has a link-local scope addr. */ 1139 if (V_allow_llz_overlap == 0 && 1140 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1141 /* 1142 * If any, remove all inet6 addresses from the member 1143 * interfaces. 1144 */ 1145 BRIDGE_XLOCK(sc); 1146 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1147 if (in6ifa_llaonifp(bif->bif_ifp)) { 1148 BRIDGE_UNLOCK(sc); 1149 in6_ifdetach(bif->bif_ifp); 1150 BRIDGE_LOCK(sc); 1151 if_printf(sc->sc_ifp, 1152 "IPv6 addresses on %s have been removed " 1153 "before adding it as a member to prevent " 1154 "IPv6 address scope violation.\n", 1155 bif->bif_ifp->if_xname); 1156 } 1157 } 1158 BRIDGE_XDROP(sc); 1159 if (in6ifa_llaonifp(ifs)) { 1160 BRIDGE_UNLOCK(sc); 1161 in6_ifdetach(ifs); 1162 BRIDGE_LOCK(sc); 1163 if_printf(sc->sc_ifp, 1164 "IPv6 addresses on %s have been removed " 1165 "before adding it as a member to prevent " 1166 "IPv6 address scope violation.\n", 1167 ifs->if_xname); 1168 } 1169 } 1170 #endif 1171 /* Allow the first Ethernet member to define the MTU */ 1172 if (LIST_EMPTY(&sc->sc_iflist)) 1173 sc->sc_ifp->if_mtu = ifs->if_mtu; 1174 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1175 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1176 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1177 return (EINVAL); 1178 } 1179 1180 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1181 if (bif == NULL) 1182 return (ENOMEM); 1183 1184 bif->bif_ifp = ifs; 1185 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1186 bif->bif_savedcaps = ifs->if_capenable; 1187 1188 /* 1189 * Assign the interface's MAC address to the bridge if it's the first 1190 * member and the MAC address of the bridge has not been changed from 1191 * the default randomly generated one. 1192 */ 1193 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1194 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1195 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1196 sc->sc_ifaddr = ifs; 1197 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1198 } 1199 1200 ifs->if_bridge = sc; 1201 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1202 /* 1203 * XXX: XLOCK HERE!?! 1204 * 1205 * NOTE: insert_***HEAD*** should be safe for the traversals. 1206 */ 1207 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1208 1209 /* Set interface capabilities to the intersection set of all members */ 1210 bridge_mutecaps(sc); 1211 bridge_linkcheck(sc); 1212 1213 /* Place the interface into promiscuous mode */ 1214 switch (ifs->if_type) { 1215 case IFT_ETHER: 1216 case IFT_L2VLAN: 1217 BRIDGE_UNLOCK(sc); 1218 error = ifpromisc(ifs, 1); 1219 BRIDGE_LOCK(sc); 1220 break; 1221 } 1222 1223 if (error) 1224 bridge_delete_member(sc, bif, 0); 1225 return (error); 1226 } 1227 1228 static int 1229 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1230 { 1231 struct ifbreq *req = arg; 1232 struct bridge_iflist *bif; 1233 1234 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1235 if (bif == NULL) 1236 return (ENOENT); 1237 1238 bridge_delete_member(sc, bif, 0); 1239 1240 return (0); 1241 } 1242 1243 static int 1244 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1245 { 1246 struct ifbreq *req = arg; 1247 struct bridge_iflist *bif; 1248 struct bstp_port *bp; 1249 1250 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1251 if (bif == NULL) 1252 return (ENOENT); 1253 1254 bp = &bif->bif_stp; 1255 req->ifbr_ifsflags = bif->bif_flags; 1256 req->ifbr_state = bp->bp_state; 1257 req->ifbr_priority = bp->bp_priority; 1258 req->ifbr_path_cost = bp->bp_path_cost; 1259 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1260 req->ifbr_proto = bp->bp_protover; 1261 req->ifbr_role = bp->bp_role; 1262 req->ifbr_stpflags = bp->bp_flags; 1263 req->ifbr_addrcnt = bif->bif_addrcnt; 1264 req->ifbr_addrmax = bif->bif_addrmax; 1265 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1266 1267 /* Copy STP state options as flags */ 1268 if (bp->bp_operedge) 1269 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1270 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1271 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1272 if (bp->bp_ptp_link) 1273 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1274 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1275 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1276 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1277 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1278 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1279 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1280 return (0); 1281 } 1282 1283 static int 1284 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1285 { 1286 struct ifbreq *req = arg; 1287 struct bridge_iflist *bif; 1288 struct bstp_port *bp; 1289 int error; 1290 1291 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1292 if (bif == NULL) 1293 return (ENOENT); 1294 bp = &bif->bif_stp; 1295 1296 if (req->ifbr_ifsflags & IFBIF_SPAN) 1297 /* SPAN is readonly */ 1298 return (EINVAL); 1299 1300 if (req->ifbr_ifsflags & IFBIF_STP) { 1301 if ((bif->bif_flags & IFBIF_STP) == 0) { 1302 error = bstp_enable(&bif->bif_stp); 1303 if (error) 1304 return (error); 1305 } 1306 } else { 1307 if ((bif->bif_flags & IFBIF_STP) != 0) 1308 bstp_disable(&bif->bif_stp); 1309 } 1310 1311 /* Pass on STP flags */ 1312 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1313 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1314 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1315 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1316 1317 /* Save the bits relating to the bridge */ 1318 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1319 1320 return (0); 1321 } 1322 1323 static int 1324 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1325 { 1326 struct ifbrparam *param = arg; 1327 1328 sc->sc_brtmax = param->ifbrp_csize; 1329 bridge_rttrim(sc); 1330 1331 return (0); 1332 } 1333 1334 static int 1335 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1336 { 1337 struct ifbrparam *param = arg; 1338 1339 param->ifbrp_csize = sc->sc_brtmax; 1340 1341 return (0); 1342 } 1343 1344 static int 1345 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1346 { 1347 struct ifbifconf *bifc = arg; 1348 struct bridge_iflist *bif; 1349 struct ifbreq breq; 1350 char *buf, *outbuf; 1351 int count, buflen, len, error = 0; 1352 1353 count = 0; 1354 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1355 count++; 1356 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1357 count++; 1358 1359 buflen = sizeof(breq) * count; 1360 if (bifc->ifbic_len == 0) { 1361 bifc->ifbic_len = buflen; 1362 return (0); 1363 } 1364 BRIDGE_UNLOCK(sc); 1365 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1366 BRIDGE_LOCK(sc); 1367 1368 count = 0; 1369 buf = outbuf; 1370 len = min(bifc->ifbic_len, buflen); 1371 bzero(&breq, sizeof(breq)); 1372 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1373 if (len < sizeof(breq)) 1374 break; 1375 1376 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1377 sizeof(breq.ifbr_ifsname)); 1378 /* Fill in the ifbreq structure */ 1379 error = bridge_ioctl_gifflags(sc, &breq); 1380 if (error) 1381 break; 1382 memcpy(buf, &breq, sizeof(breq)); 1383 count++; 1384 buf += sizeof(breq); 1385 len -= sizeof(breq); 1386 } 1387 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1388 if (len < sizeof(breq)) 1389 break; 1390 1391 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1392 sizeof(breq.ifbr_ifsname)); 1393 breq.ifbr_ifsflags = bif->bif_flags; 1394 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1395 memcpy(buf, &breq, sizeof(breq)); 1396 count++; 1397 buf += sizeof(breq); 1398 len -= sizeof(breq); 1399 } 1400 1401 BRIDGE_UNLOCK(sc); 1402 bifc->ifbic_len = sizeof(breq) * count; 1403 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1404 BRIDGE_LOCK(sc); 1405 free(outbuf, M_TEMP); 1406 return (error); 1407 } 1408 1409 static int 1410 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1411 { 1412 struct ifbaconf *bac = arg; 1413 struct bridge_rtnode *brt; 1414 struct ifbareq bareq; 1415 char *buf, *outbuf; 1416 int count, buflen, len, error = 0; 1417 1418 if (bac->ifbac_len == 0) 1419 return (0); 1420 1421 count = 0; 1422 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1423 count++; 1424 buflen = sizeof(bareq) * count; 1425 1426 BRIDGE_UNLOCK(sc); 1427 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1428 BRIDGE_LOCK(sc); 1429 1430 count = 0; 1431 buf = outbuf; 1432 len = min(bac->ifbac_len, buflen); 1433 bzero(&bareq, sizeof(bareq)); 1434 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1435 if (len < sizeof(bareq)) 1436 goto out; 1437 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1438 sizeof(bareq.ifba_ifsname)); 1439 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1440 bareq.ifba_vlan = brt->brt_vlan; 1441 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1442 time_uptime < brt->brt_expire) 1443 bareq.ifba_expire = brt->brt_expire - time_uptime; 1444 else 1445 bareq.ifba_expire = 0; 1446 bareq.ifba_flags = brt->brt_flags; 1447 1448 memcpy(buf, &bareq, sizeof(bareq)); 1449 count++; 1450 buf += sizeof(bareq); 1451 len -= sizeof(bareq); 1452 } 1453 out: 1454 BRIDGE_UNLOCK(sc); 1455 bac->ifbac_len = sizeof(bareq) * count; 1456 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1457 BRIDGE_LOCK(sc); 1458 free(outbuf, M_TEMP); 1459 return (error); 1460 } 1461 1462 static int 1463 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1464 { 1465 struct ifbareq *req = arg; 1466 struct bridge_iflist *bif; 1467 int error; 1468 1469 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1470 if (bif == NULL) 1471 return (ENOENT); 1472 1473 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1474 req->ifba_flags); 1475 1476 return (error); 1477 } 1478 1479 static int 1480 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1481 { 1482 struct ifbrparam *param = arg; 1483 1484 sc->sc_brttimeout = param->ifbrp_ctime; 1485 return (0); 1486 } 1487 1488 static int 1489 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1490 { 1491 struct ifbrparam *param = arg; 1492 1493 param->ifbrp_ctime = sc->sc_brttimeout; 1494 return (0); 1495 } 1496 1497 static int 1498 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1499 { 1500 struct ifbareq *req = arg; 1501 1502 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1503 } 1504 1505 static int 1506 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1507 { 1508 struct ifbreq *req = arg; 1509 1510 bridge_rtflush(sc, req->ifbr_ifsflags); 1511 return (0); 1512 } 1513 1514 static int 1515 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1516 { 1517 struct ifbrparam *param = arg; 1518 struct bstp_state *bs = &sc->sc_stp; 1519 1520 param->ifbrp_prio = bs->bs_bridge_priority; 1521 return (0); 1522 } 1523 1524 static int 1525 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1526 { 1527 struct ifbrparam *param = arg; 1528 1529 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1530 } 1531 1532 static int 1533 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1534 { 1535 struct ifbrparam *param = arg; 1536 struct bstp_state *bs = &sc->sc_stp; 1537 1538 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1539 return (0); 1540 } 1541 1542 static int 1543 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1544 { 1545 struct ifbrparam *param = arg; 1546 1547 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1548 } 1549 1550 static int 1551 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1552 { 1553 struct ifbrparam *param = arg; 1554 struct bstp_state *bs = &sc->sc_stp; 1555 1556 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1557 return (0); 1558 } 1559 1560 static int 1561 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1562 { 1563 struct ifbrparam *param = arg; 1564 1565 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1566 } 1567 1568 static int 1569 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1570 { 1571 struct ifbrparam *param = arg; 1572 struct bstp_state *bs = &sc->sc_stp; 1573 1574 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1575 return (0); 1576 } 1577 1578 static int 1579 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1580 { 1581 struct ifbrparam *param = arg; 1582 1583 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1584 } 1585 1586 static int 1587 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1588 { 1589 struct ifbreq *req = arg; 1590 struct bridge_iflist *bif; 1591 1592 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1593 if (bif == NULL) 1594 return (ENOENT); 1595 1596 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1597 } 1598 1599 static int 1600 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1601 { 1602 struct ifbreq *req = arg; 1603 struct bridge_iflist *bif; 1604 1605 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1606 if (bif == NULL) 1607 return (ENOENT); 1608 1609 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1610 } 1611 1612 static int 1613 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1614 { 1615 struct ifbreq *req = arg; 1616 struct bridge_iflist *bif; 1617 1618 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1619 if (bif == NULL) 1620 return (ENOENT); 1621 1622 bif->bif_addrmax = req->ifbr_addrmax; 1623 return (0); 1624 } 1625 1626 static int 1627 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1628 { 1629 struct ifbreq *req = arg; 1630 struct bridge_iflist *bif = NULL; 1631 struct ifnet *ifs; 1632 1633 ifs = ifunit(req->ifbr_ifsname); 1634 if (ifs == NULL) 1635 return (ENOENT); 1636 1637 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1638 if (ifs == bif->bif_ifp) 1639 return (EBUSY); 1640 1641 if (ifs->if_bridge != NULL) 1642 return (EBUSY); 1643 1644 switch (ifs->if_type) { 1645 case IFT_ETHER: 1646 case IFT_GIF: 1647 case IFT_L2VLAN: 1648 break; 1649 default: 1650 return (EINVAL); 1651 } 1652 1653 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1654 if (bif == NULL) 1655 return (ENOMEM); 1656 1657 bif->bif_ifp = ifs; 1658 bif->bif_flags = IFBIF_SPAN; 1659 1660 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1661 1662 return (0); 1663 } 1664 1665 static int 1666 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1667 { 1668 struct ifbreq *req = arg; 1669 struct bridge_iflist *bif; 1670 struct ifnet *ifs; 1671 1672 ifs = ifunit(req->ifbr_ifsname); 1673 if (ifs == NULL) 1674 return (ENOENT); 1675 1676 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1677 if (ifs == bif->bif_ifp) 1678 break; 1679 1680 if (bif == NULL) 1681 return (ENOENT); 1682 1683 bridge_delete_span(sc, bif); 1684 1685 return (0); 1686 } 1687 1688 static int 1689 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1690 { 1691 struct ifbropreq *req = arg; 1692 struct bstp_state *bs = &sc->sc_stp; 1693 struct bstp_port *root_port; 1694 1695 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1696 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1697 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1698 1699 root_port = bs->bs_root_port; 1700 if (root_port == NULL) 1701 req->ifbop_root_port = 0; 1702 else 1703 req->ifbop_root_port = root_port->bp_ifp->if_index; 1704 1705 req->ifbop_holdcount = bs->bs_txholdcount; 1706 req->ifbop_priority = bs->bs_bridge_priority; 1707 req->ifbop_protocol = bs->bs_protover; 1708 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1709 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1710 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1711 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1712 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1713 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1714 1715 return (0); 1716 } 1717 1718 static int 1719 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1720 { 1721 struct ifbrparam *param = arg; 1722 1723 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1724 return (0); 1725 } 1726 1727 static int 1728 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1729 { 1730 struct ifbpstpconf *bifstp = arg; 1731 struct bridge_iflist *bif; 1732 struct bstp_port *bp; 1733 struct ifbpstpreq bpreq; 1734 char *buf, *outbuf; 1735 int count, buflen, len, error = 0; 1736 1737 count = 0; 1738 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1739 if ((bif->bif_flags & IFBIF_STP) != 0) 1740 count++; 1741 } 1742 1743 buflen = sizeof(bpreq) * count; 1744 if (bifstp->ifbpstp_len == 0) { 1745 bifstp->ifbpstp_len = buflen; 1746 return (0); 1747 } 1748 1749 BRIDGE_UNLOCK(sc); 1750 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1751 BRIDGE_LOCK(sc); 1752 1753 count = 0; 1754 buf = outbuf; 1755 len = min(bifstp->ifbpstp_len, buflen); 1756 bzero(&bpreq, sizeof(bpreq)); 1757 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1758 if (len < sizeof(bpreq)) 1759 break; 1760 1761 if ((bif->bif_flags & IFBIF_STP) == 0) 1762 continue; 1763 1764 bp = &bif->bif_stp; 1765 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1766 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1767 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1768 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1769 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1770 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1771 1772 memcpy(buf, &bpreq, sizeof(bpreq)); 1773 count++; 1774 buf += sizeof(bpreq); 1775 len -= sizeof(bpreq); 1776 } 1777 1778 BRIDGE_UNLOCK(sc); 1779 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1780 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1781 BRIDGE_LOCK(sc); 1782 free(outbuf, M_TEMP); 1783 return (error); 1784 } 1785 1786 static int 1787 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1788 { 1789 struct ifbrparam *param = arg; 1790 1791 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1792 } 1793 1794 static int 1795 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1796 { 1797 struct ifbrparam *param = arg; 1798 1799 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1800 } 1801 1802 /* 1803 * bridge_ifdetach: 1804 * 1805 * Detach an interface from a bridge. Called when a member 1806 * interface is detaching. 1807 */ 1808 static void 1809 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1810 { 1811 struct bridge_softc *sc = ifp->if_bridge; 1812 struct bridge_iflist *bif; 1813 1814 if (ifp->if_flags & IFF_RENAMING) 1815 return; 1816 if (V_bridge_cloner == NULL) { 1817 /* 1818 * This detach handler can be called after 1819 * vnet_bridge_uninit(). Just return in that case. 1820 */ 1821 return; 1822 } 1823 /* Check if the interface is a bridge member */ 1824 if (sc != NULL) { 1825 BRIDGE_LOCK(sc); 1826 1827 bif = bridge_lookup_member_if(sc, ifp); 1828 if (bif != NULL) 1829 bridge_delete_member(sc, bif, 1); 1830 1831 BRIDGE_UNLOCK(sc); 1832 return; 1833 } 1834 1835 /* Check if the interface is a span port */ 1836 BRIDGE_LIST_LOCK(); 1837 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1838 BRIDGE_LOCK(sc); 1839 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1840 if (ifp == bif->bif_ifp) { 1841 bridge_delete_span(sc, bif); 1842 break; 1843 } 1844 1845 BRIDGE_UNLOCK(sc); 1846 } 1847 BRIDGE_LIST_UNLOCK(); 1848 } 1849 1850 /* 1851 * bridge_init: 1852 * 1853 * Initialize a bridge interface. 1854 */ 1855 static void 1856 bridge_init(void *xsc) 1857 { 1858 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1859 struct ifnet *ifp = sc->sc_ifp; 1860 1861 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1862 return; 1863 1864 BRIDGE_LOCK(sc); 1865 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1866 bridge_timer, sc); 1867 1868 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1869 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1870 1871 BRIDGE_UNLOCK(sc); 1872 } 1873 1874 /* 1875 * bridge_stop: 1876 * 1877 * Stop the bridge interface. 1878 */ 1879 static void 1880 bridge_stop(struct ifnet *ifp, int disable) 1881 { 1882 struct bridge_softc *sc = ifp->if_softc; 1883 1884 BRIDGE_LOCK_ASSERT(sc); 1885 1886 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1887 return; 1888 1889 callout_stop(&sc->sc_brcallout); 1890 bstp_stop(&sc->sc_stp); 1891 1892 bridge_rtflush(sc, IFBF_FLUSHDYN); 1893 1894 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1895 } 1896 1897 /* 1898 * bridge_enqueue: 1899 * 1900 * Enqueue a packet on a bridge member interface. 1901 * 1902 */ 1903 static int 1904 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1905 { 1906 int len, err = 0; 1907 short mflags; 1908 struct mbuf *m0; 1909 1910 /* We may be sending a fragment so traverse the mbuf */ 1911 for (; m; m = m0) { 1912 m0 = m->m_nextpkt; 1913 m->m_nextpkt = NULL; 1914 len = m->m_pkthdr.len; 1915 mflags = m->m_flags; 1916 1917 /* 1918 * If underlying interface can not do VLAN tag insertion itself 1919 * then attach a packet tag that holds it. 1920 */ 1921 if ((m->m_flags & M_VLANTAG) && 1922 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1923 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1924 if (m == NULL) { 1925 if_printf(dst_ifp, 1926 "unable to prepend VLAN header\n"); 1927 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 1928 continue; 1929 } 1930 m->m_flags &= ~M_VLANTAG; 1931 } 1932 1933 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 1934 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1935 m_freem(m0); 1936 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1937 break; 1938 } 1939 1940 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 1941 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 1942 if (mflags & M_MCAST) 1943 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 1944 } 1945 1946 return (err); 1947 } 1948 1949 /* 1950 * bridge_dummynet: 1951 * 1952 * Receive a queued packet from dummynet and pass it on to the output 1953 * interface. 1954 * 1955 * The mbuf has the Ethernet header already attached. 1956 */ 1957 static void 1958 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1959 { 1960 struct bridge_softc *sc; 1961 1962 sc = ifp->if_bridge; 1963 1964 /* 1965 * The packet didnt originate from a member interface. This should only 1966 * ever happen if a member interface is removed while packets are 1967 * queued for it. 1968 */ 1969 if (sc == NULL) { 1970 m_freem(m); 1971 return; 1972 } 1973 1974 if (PFIL_HOOKED(&V_inet_pfil_hook) 1975 #ifdef INET6 1976 || PFIL_HOOKED(&V_inet6_pfil_hook) 1977 #endif 1978 ) { 1979 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1980 return; 1981 if (m == NULL) 1982 return; 1983 } 1984 1985 bridge_enqueue(sc, ifp, m); 1986 } 1987 1988 /* 1989 * bridge_output: 1990 * 1991 * Send output from a bridge member interface. This 1992 * performs the bridging function for locally originated 1993 * packets. 1994 * 1995 * The mbuf has the Ethernet header already attached. We must 1996 * enqueue or free the mbuf before returning. 1997 */ 1998 static int 1999 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2000 struct rtentry *rt) 2001 { 2002 struct ether_header *eh; 2003 struct ifnet *dst_if; 2004 struct bridge_softc *sc; 2005 uint16_t vlan; 2006 2007 if (m->m_len < ETHER_HDR_LEN) { 2008 m = m_pullup(m, ETHER_HDR_LEN); 2009 if (m == NULL) 2010 return (0); 2011 } 2012 2013 eh = mtod(m, struct ether_header *); 2014 sc = ifp->if_bridge; 2015 vlan = VLANTAGOF(m); 2016 2017 BRIDGE_LOCK(sc); 2018 2019 /* 2020 * If bridge is down, but the original output interface is up, 2021 * go ahead and send out that interface. Otherwise, the packet 2022 * is dropped below. 2023 */ 2024 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2025 dst_if = ifp; 2026 goto sendunicast; 2027 } 2028 2029 /* 2030 * If the packet is a multicast, or we don't know a better way to 2031 * get there, send to all interfaces. 2032 */ 2033 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2034 dst_if = NULL; 2035 else 2036 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2037 if (dst_if == NULL) { 2038 struct bridge_iflist *bif; 2039 struct mbuf *mc; 2040 int error = 0, used = 0; 2041 2042 bridge_span(sc, m); 2043 2044 BRIDGE_LOCK2REF(sc, error); 2045 if (error) { 2046 m_freem(m); 2047 return (0); 2048 } 2049 2050 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2051 dst_if = bif->bif_ifp; 2052 2053 if (dst_if->if_type == IFT_GIF) 2054 continue; 2055 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2056 continue; 2057 2058 /* 2059 * If this is not the original output interface, 2060 * and the interface is participating in spanning 2061 * tree, make sure the port is in a state that 2062 * allows forwarding. 2063 */ 2064 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2065 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2066 continue; 2067 2068 if (LIST_NEXT(bif, bif_next) == NULL) { 2069 used = 1; 2070 mc = m; 2071 } else { 2072 mc = m_copypacket(m, M_NOWAIT); 2073 if (mc == NULL) { 2074 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2075 continue; 2076 } 2077 } 2078 2079 bridge_enqueue(sc, dst_if, mc); 2080 } 2081 if (used == 0) 2082 m_freem(m); 2083 BRIDGE_UNREF(sc); 2084 return (0); 2085 } 2086 2087 sendunicast: 2088 /* 2089 * XXX Spanning tree consideration here? 2090 */ 2091 2092 bridge_span(sc, m); 2093 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2094 m_freem(m); 2095 BRIDGE_UNLOCK(sc); 2096 return (0); 2097 } 2098 2099 BRIDGE_UNLOCK(sc); 2100 bridge_enqueue(sc, dst_if, m); 2101 return (0); 2102 } 2103 2104 /* 2105 * bridge_transmit: 2106 * 2107 * Do output on a bridge. 2108 * 2109 */ 2110 static int 2111 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2112 { 2113 struct bridge_softc *sc; 2114 struct ether_header *eh; 2115 struct ifnet *dst_if; 2116 int error = 0; 2117 2118 sc = ifp->if_softc; 2119 2120 ETHER_BPF_MTAP(ifp, m); 2121 2122 eh = mtod(m, struct ether_header *); 2123 2124 BRIDGE_LOCK(sc); 2125 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2126 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2127 BRIDGE_UNLOCK(sc); 2128 error = bridge_enqueue(sc, dst_if, m); 2129 } else 2130 bridge_broadcast(sc, ifp, m, 0); 2131 2132 return (error); 2133 } 2134 2135 /* 2136 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2137 */ 2138 static void 2139 bridge_qflush(struct ifnet *ifp __unused) 2140 { 2141 } 2142 2143 /* 2144 * bridge_forward: 2145 * 2146 * The forwarding function of the bridge. 2147 * 2148 * NOTE: Releases the lock on return. 2149 */ 2150 static void 2151 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2152 struct mbuf *m) 2153 { 2154 struct bridge_iflist *dbif; 2155 struct ifnet *src_if, *dst_if, *ifp; 2156 struct ether_header *eh; 2157 uint16_t vlan; 2158 uint8_t *dst; 2159 int error; 2160 2161 src_if = m->m_pkthdr.rcvif; 2162 ifp = sc->sc_ifp; 2163 2164 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2165 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2166 vlan = VLANTAGOF(m); 2167 2168 if ((sbif->bif_flags & IFBIF_STP) && 2169 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2170 goto drop; 2171 2172 eh = mtod(m, struct ether_header *); 2173 dst = eh->ether_dhost; 2174 2175 /* If the interface is learning, record the address. */ 2176 if (sbif->bif_flags & IFBIF_LEARNING) { 2177 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2178 sbif, 0, IFBAF_DYNAMIC); 2179 /* 2180 * If the interface has addresses limits then deny any source 2181 * that is not in the cache. 2182 */ 2183 if (error && sbif->bif_addrmax) 2184 goto drop; 2185 } 2186 2187 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2188 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2189 goto drop; 2190 2191 /* 2192 * At this point, the port either doesn't participate 2193 * in spanning tree or it is in the forwarding state. 2194 */ 2195 2196 /* 2197 * If the packet is unicast, destined for someone on 2198 * "this" side of the bridge, drop it. 2199 */ 2200 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2201 dst_if = bridge_rtlookup(sc, dst, vlan); 2202 if (src_if == dst_if) 2203 goto drop; 2204 } else { 2205 /* 2206 * Check if its a reserved multicast address, any address 2207 * listed in 802.1D section 7.12.6 may not be forwarded by the 2208 * bridge. 2209 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2210 */ 2211 if (dst[0] == 0x01 && dst[1] == 0x80 && 2212 dst[2] == 0xc2 && dst[3] == 0x00 && 2213 dst[4] == 0x00 && dst[5] <= 0x0f) 2214 goto drop; 2215 2216 /* ...forward it to all interfaces. */ 2217 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2218 dst_if = NULL; 2219 } 2220 2221 /* 2222 * If we have a destination interface which is a member of our bridge, 2223 * OR this is a unicast packet, push it through the bpf(4) machinery. 2224 * For broadcast or multicast packets, don't bother because it will 2225 * be reinjected into ether_input. We do this before we pass the packets 2226 * through the pfil(9) framework, as it is possible that pfil(9) will 2227 * drop the packet, or possibly modify it, making it difficult to debug 2228 * firewall issues on the bridge. 2229 */ 2230 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2231 ETHER_BPF_MTAP(ifp, m); 2232 2233 /* run the packet filter */ 2234 if (PFIL_HOOKED(&V_inet_pfil_hook) 2235 #ifdef INET6 2236 || PFIL_HOOKED(&V_inet6_pfil_hook) 2237 #endif 2238 ) { 2239 BRIDGE_UNLOCK(sc); 2240 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2241 return; 2242 if (m == NULL) 2243 return; 2244 BRIDGE_LOCK(sc); 2245 } 2246 2247 if (dst_if == NULL) { 2248 bridge_broadcast(sc, src_if, m, 1); 2249 return; 2250 } 2251 2252 /* 2253 * At this point, we're dealing with a unicast frame 2254 * going to a different interface. 2255 */ 2256 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2257 goto drop; 2258 2259 dbif = bridge_lookup_member_if(sc, dst_if); 2260 if (dbif == NULL) 2261 /* Not a member of the bridge (anymore?) */ 2262 goto drop; 2263 2264 /* Private segments can not talk to each other */ 2265 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2266 goto drop; 2267 2268 if ((dbif->bif_flags & IFBIF_STP) && 2269 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2270 goto drop; 2271 2272 BRIDGE_UNLOCK(sc); 2273 2274 if (PFIL_HOOKED(&V_inet_pfil_hook) 2275 #ifdef INET6 2276 || PFIL_HOOKED(&V_inet6_pfil_hook) 2277 #endif 2278 ) { 2279 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2280 return; 2281 if (m == NULL) 2282 return; 2283 } 2284 2285 bridge_enqueue(sc, dst_if, m); 2286 return; 2287 2288 drop: 2289 BRIDGE_UNLOCK(sc); 2290 m_freem(m); 2291 } 2292 2293 /* 2294 * bridge_input: 2295 * 2296 * Receive input from a member interface. Queue the packet for 2297 * bridging if it is not for us. 2298 */ 2299 static struct mbuf * 2300 bridge_input(struct ifnet *ifp, struct mbuf *m) 2301 { 2302 struct bridge_softc *sc = ifp->if_bridge; 2303 struct bridge_iflist *bif, *bif2; 2304 struct ifnet *bifp; 2305 struct ether_header *eh; 2306 struct mbuf *mc, *mc2; 2307 uint16_t vlan; 2308 int error; 2309 2310 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2311 return (m); 2312 2313 bifp = sc->sc_ifp; 2314 vlan = VLANTAGOF(m); 2315 2316 /* 2317 * Implement support for bridge monitoring. If this flag has been 2318 * set on this interface, discard the packet once we push it through 2319 * the bpf(4) machinery, but before we do, increment the byte and 2320 * packet counters associated with this interface. 2321 */ 2322 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2323 m->m_pkthdr.rcvif = bifp; 2324 ETHER_BPF_MTAP(bifp, m); 2325 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2326 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2327 m_freem(m); 2328 return (NULL); 2329 } 2330 BRIDGE_LOCK(sc); 2331 bif = bridge_lookup_member_if(sc, ifp); 2332 if (bif == NULL) { 2333 BRIDGE_UNLOCK(sc); 2334 return (m); 2335 } 2336 2337 eh = mtod(m, struct ether_header *); 2338 2339 bridge_span(sc, m); 2340 2341 if (m->m_flags & (M_BCAST|M_MCAST)) { 2342 /* Tap off 802.1D packets; they do not get forwarded. */ 2343 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2344 ETHER_ADDR_LEN) == 0) { 2345 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2346 BRIDGE_UNLOCK(sc); 2347 return (NULL); 2348 } 2349 2350 if ((bif->bif_flags & IFBIF_STP) && 2351 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2352 BRIDGE_UNLOCK(sc); 2353 return (m); 2354 } 2355 2356 /* 2357 * Make a deep copy of the packet and enqueue the copy 2358 * for bridge processing; return the original packet for 2359 * local processing. 2360 */ 2361 mc = m_dup(m, M_NOWAIT); 2362 if (mc == NULL) { 2363 BRIDGE_UNLOCK(sc); 2364 return (m); 2365 } 2366 2367 /* Perform the bridge forwarding function with the copy. */ 2368 bridge_forward(sc, bif, mc); 2369 2370 /* 2371 * Reinject the mbuf as arriving on the bridge so we have a 2372 * chance at claiming multicast packets. We can not loop back 2373 * here from ether_input as a bridge is never a member of a 2374 * bridge. 2375 */ 2376 KASSERT(bifp->if_bridge == NULL, 2377 ("loop created in bridge_input")); 2378 mc2 = m_dup(m, M_NOWAIT); 2379 if (mc2 != NULL) { 2380 /* Keep the layer3 header aligned */ 2381 int i = min(mc2->m_pkthdr.len, max_protohdr); 2382 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2383 } 2384 if (mc2 != NULL) { 2385 mc2->m_pkthdr.rcvif = bifp; 2386 (*bifp->if_input)(bifp, mc2); 2387 } 2388 2389 /* Return the original packet for local processing. */ 2390 return (m); 2391 } 2392 2393 if ((bif->bif_flags & IFBIF_STP) && 2394 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2395 BRIDGE_UNLOCK(sc); 2396 return (m); 2397 } 2398 2399 #if (defined(INET) || defined(INET6)) 2400 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2401 || ((iface)->if_carp \ 2402 && (*carp_forus_p)((iface), eh->ether_dhost)) 2403 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2404 || ((iface)->if_carp \ 2405 && (*carp_forus_p)((iface), eh->ether_shost)) 2406 #else 2407 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2408 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2409 #endif 2410 2411 #ifdef INET6 2412 # define OR_PFIL_HOOKED_INET6 \ 2413 || PFIL_HOOKED(&V_inet6_pfil_hook) 2414 #else 2415 # define OR_PFIL_HOOKED_INET6 2416 #endif 2417 2418 #define GRAB_OUR_PACKETS(iface) \ 2419 if ((iface)->if_type == IFT_GIF) \ 2420 continue; \ 2421 /* It is destined for us. */ \ 2422 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2423 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2424 ) { \ 2425 if ((iface)->if_type == IFT_BRIDGE) { \ 2426 ETHER_BPF_MTAP(iface, m); \ 2427 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \ 2428 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2429 /* Filter on the physical interface. */ \ 2430 if (V_pfil_local_phys && \ 2431 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2432 OR_PFIL_HOOKED_INET6)) { \ 2433 if (bridge_pfil(&m, NULL, ifp, \ 2434 PFIL_IN) != 0 || m == NULL) { \ 2435 BRIDGE_UNLOCK(sc); \ 2436 return (NULL); \ 2437 } \ 2438 eh = mtod(m, struct ether_header *); \ 2439 } \ 2440 } \ 2441 if (bif->bif_flags & IFBIF_LEARNING) { \ 2442 error = bridge_rtupdate(sc, eh->ether_shost, \ 2443 vlan, bif, 0, IFBAF_DYNAMIC); \ 2444 if (error && bif->bif_addrmax) { \ 2445 BRIDGE_UNLOCK(sc); \ 2446 m_freem(m); \ 2447 return (NULL); \ 2448 } \ 2449 } \ 2450 m->m_pkthdr.rcvif = iface; \ 2451 BRIDGE_UNLOCK(sc); \ 2452 return (m); \ 2453 } \ 2454 \ 2455 /* We just received a packet that we sent out. */ \ 2456 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2457 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2458 ) { \ 2459 BRIDGE_UNLOCK(sc); \ 2460 m_freem(m); \ 2461 return (NULL); \ 2462 } 2463 2464 /* 2465 * Unicast. Make sure it's not for the bridge. 2466 */ 2467 do { GRAB_OUR_PACKETS(bifp) } while (0); 2468 2469 /* 2470 * Give a chance for ifp at first priority. This will help when the 2471 * packet comes through the interface like VLAN's with the same MACs 2472 * on several interfaces from the same bridge. This also will save 2473 * some CPU cycles in case the destination interface and the input 2474 * interface (eq ifp) are the same. 2475 */ 2476 do { GRAB_OUR_PACKETS(ifp) } while (0); 2477 2478 /* Now check the all bridge members. */ 2479 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2480 GRAB_OUR_PACKETS(bif2->bif_ifp) 2481 } 2482 2483 #undef OR_CARP_CHECK_WE_ARE_DST 2484 #undef OR_CARP_CHECK_WE_ARE_SRC 2485 #undef OR_PFIL_HOOKED_INET6 2486 #undef GRAB_OUR_PACKETS 2487 2488 /* Perform the bridge forwarding function. */ 2489 bridge_forward(sc, bif, m); 2490 2491 return (NULL); 2492 } 2493 2494 /* 2495 * bridge_broadcast: 2496 * 2497 * Send a frame to all interfaces that are members of 2498 * the bridge, except for the one on which the packet 2499 * arrived. 2500 * 2501 * NOTE: Releases the lock on return. 2502 */ 2503 static void 2504 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2505 struct mbuf *m, int runfilt) 2506 { 2507 struct bridge_iflist *dbif, *sbif; 2508 struct mbuf *mc; 2509 struct ifnet *dst_if; 2510 int error = 0, used = 0, i; 2511 2512 sbif = bridge_lookup_member_if(sc, src_if); 2513 2514 BRIDGE_LOCK2REF(sc, error); 2515 if (error) { 2516 m_freem(m); 2517 return; 2518 } 2519 2520 /* Filter on the bridge interface before broadcasting */ 2521 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2522 #ifdef INET6 2523 || PFIL_HOOKED(&V_inet6_pfil_hook) 2524 #endif 2525 )) { 2526 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2527 goto out; 2528 if (m == NULL) 2529 goto out; 2530 } 2531 2532 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2533 dst_if = dbif->bif_ifp; 2534 if (dst_if == src_if) 2535 continue; 2536 2537 /* Private segments can not talk to each other */ 2538 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2539 continue; 2540 2541 if ((dbif->bif_flags & IFBIF_STP) && 2542 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2543 continue; 2544 2545 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2546 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2547 continue; 2548 2549 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2550 continue; 2551 2552 if (LIST_NEXT(dbif, bif_next) == NULL) { 2553 mc = m; 2554 used = 1; 2555 } else { 2556 mc = m_dup(m, M_NOWAIT); 2557 if (mc == NULL) { 2558 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2559 continue; 2560 } 2561 } 2562 2563 /* 2564 * Filter on the output interface. Pass a NULL bridge interface 2565 * pointer so we do not redundantly filter on the bridge for 2566 * each interface we broadcast on. 2567 */ 2568 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2569 #ifdef INET6 2570 || PFIL_HOOKED(&V_inet6_pfil_hook) 2571 #endif 2572 )) { 2573 if (used == 0) { 2574 /* Keep the layer3 header aligned */ 2575 i = min(mc->m_pkthdr.len, max_protohdr); 2576 mc = m_copyup(mc, i, ETHER_ALIGN); 2577 if (mc == NULL) { 2578 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2579 continue; 2580 } 2581 } 2582 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2583 continue; 2584 if (mc == NULL) 2585 continue; 2586 } 2587 2588 bridge_enqueue(sc, dst_if, mc); 2589 } 2590 if (used == 0) 2591 m_freem(m); 2592 2593 out: 2594 BRIDGE_UNREF(sc); 2595 } 2596 2597 /* 2598 * bridge_span: 2599 * 2600 * Duplicate a packet out one or more interfaces that are in span mode, 2601 * the original mbuf is unmodified. 2602 */ 2603 static void 2604 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2605 { 2606 struct bridge_iflist *bif; 2607 struct ifnet *dst_if; 2608 struct mbuf *mc; 2609 2610 if (LIST_EMPTY(&sc->sc_spanlist)) 2611 return; 2612 2613 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2614 dst_if = bif->bif_ifp; 2615 2616 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2617 continue; 2618 2619 mc = m_copypacket(m, M_NOWAIT); 2620 if (mc == NULL) { 2621 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2622 continue; 2623 } 2624 2625 bridge_enqueue(sc, dst_if, mc); 2626 } 2627 } 2628 2629 /* 2630 * bridge_rtupdate: 2631 * 2632 * Add a bridge routing entry. 2633 */ 2634 static int 2635 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2636 struct bridge_iflist *bif, int setflags, uint8_t flags) 2637 { 2638 struct bridge_rtnode *brt; 2639 int error; 2640 2641 BRIDGE_LOCK_ASSERT(sc); 2642 2643 /* Check the source address is valid and not multicast. */ 2644 if (ETHER_IS_MULTICAST(dst) || 2645 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2646 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2647 return (EINVAL); 2648 2649 /* 802.1p frames map to vlan 1 */ 2650 if (vlan == 0) 2651 vlan = 1; 2652 2653 /* 2654 * A route for this destination might already exist. If so, 2655 * update it, otherwise create a new one. 2656 */ 2657 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2658 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2659 sc->sc_brtexceeded++; 2660 return (ENOSPC); 2661 } 2662 /* Check per interface address limits (if enabled) */ 2663 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2664 bif->bif_addrexceeded++; 2665 return (ENOSPC); 2666 } 2667 2668 /* 2669 * Allocate a new bridge forwarding node, and 2670 * initialize the expiration time and Ethernet 2671 * address. 2672 */ 2673 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2674 if (brt == NULL) 2675 return (ENOMEM); 2676 2677 if (bif->bif_flags & IFBIF_STICKY) 2678 brt->brt_flags = IFBAF_STICKY; 2679 else 2680 brt->brt_flags = IFBAF_DYNAMIC; 2681 2682 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2683 brt->brt_vlan = vlan; 2684 2685 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2686 uma_zfree(bridge_rtnode_zone, brt); 2687 return (error); 2688 } 2689 brt->brt_dst = bif; 2690 bif->bif_addrcnt++; 2691 } 2692 2693 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2694 brt->brt_dst != bif) { 2695 brt->brt_dst->bif_addrcnt--; 2696 brt->brt_dst = bif; 2697 brt->brt_dst->bif_addrcnt++; 2698 } 2699 2700 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2701 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2702 if (setflags) 2703 brt->brt_flags = flags; 2704 2705 return (0); 2706 } 2707 2708 /* 2709 * bridge_rtlookup: 2710 * 2711 * Lookup the destination interface for an address. 2712 */ 2713 static struct ifnet * 2714 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2715 { 2716 struct bridge_rtnode *brt; 2717 2718 BRIDGE_LOCK_ASSERT(sc); 2719 2720 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2721 return (NULL); 2722 2723 return (brt->brt_ifp); 2724 } 2725 2726 /* 2727 * bridge_rttrim: 2728 * 2729 * Trim the routine table so that we have a number 2730 * of routing entries less than or equal to the 2731 * maximum number. 2732 */ 2733 static void 2734 bridge_rttrim(struct bridge_softc *sc) 2735 { 2736 struct bridge_rtnode *brt, *nbrt; 2737 2738 BRIDGE_LOCK_ASSERT(sc); 2739 2740 /* Make sure we actually need to do this. */ 2741 if (sc->sc_brtcnt <= sc->sc_brtmax) 2742 return; 2743 2744 /* Force an aging cycle; this might trim enough addresses. */ 2745 bridge_rtage(sc); 2746 if (sc->sc_brtcnt <= sc->sc_brtmax) 2747 return; 2748 2749 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2750 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2751 bridge_rtnode_destroy(sc, brt); 2752 if (sc->sc_brtcnt <= sc->sc_brtmax) 2753 return; 2754 } 2755 } 2756 } 2757 2758 /* 2759 * bridge_timer: 2760 * 2761 * Aging timer for the bridge. 2762 */ 2763 static void 2764 bridge_timer(void *arg) 2765 { 2766 struct bridge_softc *sc = arg; 2767 2768 BRIDGE_LOCK_ASSERT(sc); 2769 2770 bridge_rtage(sc); 2771 2772 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2773 callout_reset(&sc->sc_brcallout, 2774 bridge_rtable_prune_period * hz, bridge_timer, sc); 2775 } 2776 2777 /* 2778 * bridge_rtage: 2779 * 2780 * Perform an aging cycle. 2781 */ 2782 static void 2783 bridge_rtage(struct bridge_softc *sc) 2784 { 2785 struct bridge_rtnode *brt, *nbrt; 2786 2787 BRIDGE_LOCK_ASSERT(sc); 2788 2789 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2790 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2791 if (time_uptime >= brt->brt_expire) 2792 bridge_rtnode_destroy(sc, brt); 2793 } 2794 } 2795 } 2796 2797 /* 2798 * bridge_rtflush: 2799 * 2800 * Remove all dynamic addresses from the bridge. 2801 */ 2802 static void 2803 bridge_rtflush(struct bridge_softc *sc, int full) 2804 { 2805 struct bridge_rtnode *brt, *nbrt; 2806 2807 BRIDGE_LOCK_ASSERT(sc); 2808 2809 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2810 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2811 bridge_rtnode_destroy(sc, brt); 2812 } 2813 } 2814 2815 /* 2816 * bridge_rtdaddr: 2817 * 2818 * Remove an address from the table. 2819 */ 2820 static int 2821 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2822 { 2823 struct bridge_rtnode *brt; 2824 int found = 0; 2825 2826 BRIDGE_LOCK_ASSERT(sc); 2827 2828 /* 2829 * If vlan is zero then we want to delete for all vlans so the lookup 2830 * may return more than one. 2831 */ 2832 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2833 bridge_rtnode_destroy(sc, brt); 2834 found = 1; 2835 } 2836 2837 return (found ? 0 : ENOENT); 2838 } 2839 2840 /* 2841 * bridge_rtdelete: 2842 * 2843 * Delete routes to a speicifc member interface. 2844 */ 2845 static void 2846 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2847 { 2848 struct bridge_rtnode *brt, *nbrt; 2849 2850 BRIDGE_LOCK_ASSERT(sc); 2851 2852 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2853 if (brt->brt_ifp == ifp && (full || 2854 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2855 bridge_rtnode_destroy(sc, brt); 2856 } 2857 } 2858 2859 /* 2860 * bridge_rtable_init: 2861 * 2862 * Initialize the route table for this bridge. 2863 */ 2864 static void 2865 bridge_rtable_init(struct bridge_softc *sc) 2866 { 2867 int i; 2868 2869 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2870 M_DEVBUF, M_WAITOK); 2871 2872 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2873 LIST_INIT(&sc->sc_rthash[i]); 2874 2875 sc->sc_rthash_key = arc4random(); 2876 LIST_INIT(&sc->sc_rtlist); 2877 } 2878 2879 /* 2880 * bridge_rtable_fini: 2881 * 2882 * Deconstruct the route table for this bridge. 2883 */ 2884 static void 2885 bridge_rtable_fini(struct bridge_softc *sc) 2886 { 2887 2888 KASSERT(sc->sc_brtcnt == 0, 2889 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2890 free(sc->sc_rthash, M_DEVBUF); 2891 } 2892 2893 /* 2894 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2895 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2896 */ 2897 #define mix(a, b, c) \ 2898 do { \ 2899 a -= b; a -= c; a ^= (c >> 13); \ 2900 b -= c; b -= a; b ^= (a << 8); \ 2901 c -= a; c -= b; c ^= (b >> 13); \ 2902 a -= b; a -= c; a ^= (c >> 12); \ 2903 b -= c; b -= a; b ^= (a << 16); \ 2904 c -= a; c -= b; c ^= (b >> 5); \ 2905 a -= b; a -= c; a ^= (c >> 3); \ 2906 b -= c; b -= a; b ^= (a << 10); \ 2907 c -= a; c -= b; c ^= (b >> 15); \ 2908 } while (/*CONSTCOND*/0) 2909 2910 static __inline uint32_t 2911 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2912 { 2913 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2914 2915 b += addr[5] << 8; 2916 b += addr[4]; 2917 a += addr[3] << 24; 2918 a += addr[2] << 16; 2919 a += addr[1] << 8; 2920 a += addr[0]; 2921 2922 mix(a, b, c); 2923 2924 return (c & BRIDGE_RTHASH_MASK); 2925 } 2926 2927 #undef mix 2928 2929 static int 2930 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2931 { 2932 int i, d; 2933 2934 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2935 d = ((int)a[i]) - ((int)b[i]); 2936 } 2937 2938 return (d); 2939 } 2940 2941 /* 2942 * bridge_rtnode_lookup: 2943 * 2944 * Look up a bridge route node for the specified destination. Compare the 2945 * vlan id or if zero then just return the first match. 2946 */ 2947 static struct bridge_rtnode * 2948 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2949 { 2950 struct bridge_rtnode *brt; 2951 uint32_t hash; 2952 int dir; 2953 2954 BRIDGE_LOCK_ASSERT(sc); 2955 2956 hash = bridge_rthash(sc, addr); 2957 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2958 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2959 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2960 return (brt); 2961 if (dir > 0) 2962 return (NULL); 2963 } 2964 2965 return (NULL); 2966 } 2967 2968 /* 2969 * bridge_rtnode_insert: 2970 * 2971 * Insert the specified bridge node into the route table. We 2972 * assume the entry is not already in the table. 2973 */ 2974 static int 2975 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2976 { 2977 struct bridge_rtnode *lbrt; 2978 uint32_t hash; 2979 int dir; 2980 2981 BRIDGE_LOCK_ASSERT(sc); 2982 2983 hash = bridge_rthash(sc, brt->brt_addr); 2984 2985 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2986 if (lbrt == NULL) { 2987 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2988 goto out; 2989 } 2990 2991 do { 2992 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2993 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2994 return (EEXIST); 2995 if (dir > 0) { 2996 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2997 goto out; 2998 } 2999 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 3000 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3001 goto out; 3002 } 3003 lbrt = LIST_NEXT(lbrt, brt_hash); 3004 } while (lbrt != NULL); 3005 3006 #ifdef DIAGNOSTIC 3007 panic("bridge_rtnode_insert: impossible"); 3008 #endif 3009 3010 out: 3011 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3012 sc->sc_brtcnt++; 3013 3014 return (0); 3015 } 3016 3017 /* 3018 * bridge_rtnode_destroy: 3019 * 3020 * Destroy a bridge rtnode. 3021 */ 3022 static void 3023 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3024 { 3025 BRIDGE_LOCK_ASSERT(sc); 3026 3027 LIST_REMOVE(brt, brt_hash); 3028 3029 LIST_REMOVE(brt, brt_list); 3030 sc->sc_brtcnt--; 3031 brt->brt_dst->bif_addrcnt--; 3032 uma_zfree(bridge_rtnode_zone, brt); 3033 } 3034 3035 /* 3036 * bridge_rtable_expire: 3037 * 3038 * Set the expiry time for all routes on an interface. 3039 */ 3040 static void 3041 bridge_rtable_expire(struct ifnet *ifp, int age) 3042 { 3043 struct bridge_softc *sc = ifp->if_bridge; 3044 struct bridge_rtnode *brt; 3045 3046 BRIDGE_LOCK(sc); 3047 3048 /* 3049 * If the age is zero then flush, otherwise set all the expiry times to 3050 * age for the interface 3051 */ 3052 if (age == 0) 3053 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3054 else { 3055 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3056 /* Cap the expiry time to 'age' */ 3057 if (brt->brt_ifp == ifp && 3058 brt->brt_expire > time_uptime + age && 3059 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3060 brt->brt_expire = time_uptime + age; 3061 } 3062 } 3063 BRIDGE_UNLOCK(sc); 3064 } 3065 3066 /* 3067 * bridge_state_change: 3068 * 3069 * Callback from the bridgestp code when a port changes states. 3070 */ 3071 static void 3072 bridge_state_change(struct ifnet *ifp, int state) 3073 { 3074 struct bridge_softc *sc = ifp->if_bridge; 3075 static const char *stpstates[] = { 3076 "disabled", 3077 "listening", 3078 "learning", 3079 "forwarding", 3080 "blocking", 3081 "discarding" 3082 }; 3083 3084 CURVNET_SET(ifp->if_vnet); 3085 if (V_log_stp) 3086 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3087 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3088 CURVNET_RESTORE(); 3089 } 3090 3091 /* 3092 * Send bridge packets through pfil if they are one of the types pfil can deal 3093 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3094 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3095 * that interface. 3096 */ 3097 static int 3098 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3099 { 3100 int snap, error, i, hlen; 3101 struct ether_header *eh1, eh2; 3102 struct ip *ip; 3103 struct llc llc1; 3104 u_int16_t ether_type; 3105 3106 snap = 0; 3107 error = -1; /* Default error if not error == 0 */ 3108 3109 #if 0 3110 /* we may return with the IP fields swapped, ensure its not shared */ 3111 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3112 #endif 3113 3114 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3115 return (0); /* filtering is disabled */ 3116 3117 i = min((*mp)->m_pkthdr.len, max_protohdr); 3118 if ((*mp)->m_len < i) { 3119 *mp = m_pullup(*mp, i); 3120 if (*mp == NULL) { 3121 printf("%s: m_pullup failed\n", __func__); 3122 return (-1); 3123 } 3124 } 3125 3126 eh1 = mtod(*mp, struct ether_header *); 3127 ether_type = ntohs(eh1->ether_type); 3128 3129 /* 3130 * Check for SNAP/LLC. 3131 */ 3132 if (ether_type < ETHERMTU) { 3133 struct llc *llc2 = (struct llc *)(eh1 + 1); 3134 3135 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3136 llc2->llc_dsap == LLC_SNAP_LSAP && 3137 llc2->llc_ssap == LLC_SNAP_LSAP && 3138 llc2->llc_control == LLC_UI) { 3139 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3140 snap = 1; 3141 } 3142 } 3143 3144 /* 3145 * If we're trying to filter bridge traffic, don't look at anything 3146 * other than IP and ARP traffic. If the filter doesn't understand 3147 * IPv6, don't allow IPv6 through the bridge either. This is lame 3148 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3149 * but of course we don't have an AppleTalk filter to begin with. 3150 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3151 * ARP traffic.) 3152 */ 3153 switch (ether_type) { 3154 case ETHERTYPE_ARP: 3155 case ETHERTYPE_REVARP: 3156 if (V_pfil_ipfw_arp == 0) 3157 return (0); /* Automatically pass */ 3158 break; 3159 3160 case ETHERTYPE_IP: 3161 #ifdef INET6 3162 case ETHERTYPE_IPV6: 3163 #endif /* INET6 */ 3164 break; 3165 default: 3166 /* 3167 * Check to see if the user wants to pass non-ip 3168 * packets, these will not be checked by pfil(9) and 3169 * passed unconditionally so the default is to drop. 3170 */ 3171 if (V_pfil_onlyip) 3172 goto bad; 3173 } 3174 3175 /* Run the packet through pfil before stripping link headers */ 3176 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 && 3177 dir == PFIL_OUT && ifp != NULL) { 3178 3179 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3180 3181 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3182 return (error); 3183 } 3184 3185 /* Strip off the Ethernet header and keep a copy. */ 3186 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3187 m_adj(*mp, ETHER_HDR_LEN); 3188 3189 /* Strip off snap header, if present */ 3190 if (snap) { 3191 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3192 m_adj(*mp, sizeof(struct llc)); 3193 } 3194 3195 /* 3196 * Check the IP header for alignment and errors 3197 */ 3198 if (dir == PFIL_IN) { 3199 switch (ether_type) { 3200 case ETHERTYPE_IP: 3201 error = bridge_ip_checkbasic(mp); 3202 break; 3203 #ifdef INET6 3204 case ETHERTYPE_IPV6: 3205 error = bridge_ip6_checkbasic(mp); 3206 break; 3207 #endif /* INET6 */ 3208 default: 3209 error = 0; 3210 } 3211 if (error) 3212 goto bad; 3213 } 3214 3215 error = 0; 3216 3217 /* 3218 * Run the packet through pfil 3219 */ 3220 switch (ether_type) { 3221 case ETHERTYPE_IP: 3222 /* 3223 * Run pfil on the member interface and the bridge, both can 3224 * be skipped by clearing pfil_member or pfil_bridge. 3225 * 3226 * Keep the order: 3227 * in_if -> bridge_if -> out_if 3228 */ 3229 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3230 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3231 dir, NULL); 3232 3233 if (*mp == NULL || error != 0) /* filter may consume */ 3234 break; 3235 3236 if (V_pfil_member && ifp != NULL) 3237 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3238 dir, NULL); 3239 3240 if (*mp == NULL || error != 0) /* filter may consume */ 3241 break; 3242 3243 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3244 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3245 dir, NULL); 3246 3247 if (*mp == NULL || error != 0) /* filter may consume */ 3248 break; 3249 3250 /* check if we need to fragment the packet */ 3251 /* bridge_fragment generates a mbuf chain of packets */ 3252 /* that already include eth headers */ 3253 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3254 i = (*mp)->m_pkthdr.len; 3255 if (i > ifp->if_mtu) { 3256 error = bridge_fragment(ifp, mp, &eh2, snap, 3257 &llc1); 3258 return (error); 3259 } 3260 } 3261 3262 /* Recalculate the ip checksum. */ 3263 ip = mtod(*mp, struct ip *); 3264 hlen = ip->ip_hl << 2; 3265 if (hlen < sizeof(struct ip)) 3266 goto bad; 3267 if (hlen > (*mp)->m_len) { 3268 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3269 goto bad; 3270 ip = mtod(*mp, struct ip *); 3271 if (ip == NULL) 3272 goto bad; 3273 } 3274 ip->ip_sum = 0; 3275 if (hlen == sizeof(struct ip)) 3276 ip->ip_sum = in_cksum_hdr(ip); 3277 else 3278 ip->ip_sum = in_cksum(*mp, hlen); 3279 3280 break; 3281 #ifdef INET6 3282 case ETHERTYPE_IPV6: 3283 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3284 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3285 dir, NULL); 3286 3287 if (*mp == NULL || error != 0) /* filter may consume */ 3288 break; 3289 3290 if (V_pfil_member && ifp != NULL) 3291 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3292 dir, NULL); 3293 3294 if (*mp == NULL || error != 0) /* filter may consume */ 3295 break; 3296 3297 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3298 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3299 dir, NULL); 3300 break; 3301 #endif 3302 default: 3303 error = 0; 3304 break; 3305 } 3306 3307 if (*mp == NULL) 3308 return (error); 3309 if (error != 0) 3310 goto bad; 3311 3312 error = -1; 3313 3314 /* 3315 * Finally, put everything back the way it was and return 3316 */ 3317 if (snap) { 3318 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3319 if (*mp == NULL) 3320 return (error); 3321 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3322 } 3323 3324 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3325 if (*mp == NULL) 3326 return (error); 3327 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3328 3329 return (0); 3330 3331 bad: 3332 m_freem(*mp); 3333 *mp = NULL; 3334 return (error); 3335 } 3336 3337 /* 3338 * Perform basic checks on header size since 3339 * pfil assumes ip_input has already processed 3340 * it for it. Cut-and-pasted from ip_input.c. 3341 * Given how simple the IPv6 version is, 3342 * does the IPv4 version really need to be 3343 * this complicated? 3344 * 3345 * XXX Should we update ipstat here, or not? 3346 * XXX Right now we update ipstat but not 3347 * XXX csum_counter. 3348 */ 3349 static int 3350 bridge_ip_checkbasic(struct mbuf **mp) 3351 { 3352 struct mbuf *m = *mp; 3353 struct ip *ip; 3354 int len, hlen; 3355 u_short sum; 3356 3357 if (*mp == NULL) 3358 return (-1); 3359 3360 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3361 if ((m = m_copyup(m, sizeof(struct ip), 3362 (max_linkhdr + 3) & ~3)) == NULL) { 3363 /* XXXJRT new stat, please */ 3364 KMOD_IPSTAT_INC(ips_toosmall); 3365 goto bad; 3366 } 3367 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3368 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3369 KMOD_IPSTAT_INC(ips_toosmall); 3370 goto bad; 3371 } 3372 } 3373 ip = mtod(m, struct ip *); 3374 if (ip == NULL) goto bad; 3375 3376 if (ip->ip_v != IPVERSION) { 3377 KMOD_IPSTAT_INC(ips_badvers); 3378 goto bad; 3379 } 3380 hlen = ip->ip_hl << 2; 3381 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3382 KMOD_IPSTAT_INC(ips_badhlen); 3383 goto bad; 3384 } 3385 if (hlen > m->m_len) { 3386 if ((m = m_pullup(m, hlen)) == NULL) { 3387 KMOD_IPSTAT_INC(ips_badhlen); 3388 goto bad; 3389 } 3390 ip = mtod(m, struct ip *); 3391 if (ip == NULL) goto bad; 3392 } 3393 3394 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3395 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3396 } else { 3397 if (hlen == sizeof(struct ip)) { 3398 sum = in_cksum_hdr(ip); 3399 } else { 3400 sum = in_cksum(m, hlen); 3401 } 3402 } 3403 if (sum) { 3404 KMOD_IPSTAT_INC(ips_badsum); 3405 goto bad; 3406 } 3407 3408 /* Retrieve the packet length. */ 3409 len = ntohs(ip->ip_len); 3410 3411 /* 3412 * Check for additional length bogosity 3413 */ 3414 if (len < hlen) { 3415 KMOD_IPSTAT_INC(ips_badlen); 3416 goto bad; 3417 } 3418 3419 /* 3420 * Check that the amount of data in the buffers 3421 * is as at least much as the IP header would have us expect. 3422 * Drop packet if shorter than we expect. 3423 */ 3424 if (m->m_pkthdr.len < len) { 3425 KMOD_IPSTAT_INC(ips_tooshort); 3426 goto bad; 3427 } 3428 3429 /* Checks out, proceed */ 3430 *mp = m; 3431 return (0); 3432 3433 bad: 3434 *mp = m; 3435 return (-1); 3436 } 3437 3438 #ifdef INET6 3439 /* 3440 * Same as above, but for IPv6. 3441 * Cut-and-pasted from ip6_input.c. 3442 * XXX Should we update ip6stat, or not? 3443 */ 3444 static int 3445 bridge_ip6_checkbasic(struct mbuf **mp) 3446 { 3447 struct mbuf *m = *mp; 3448 struct ip6_hdr *ip6; 3449 3450 /* 3451 * If the IPv6 header is not aligned, slurp it up into a new 3452 * mbuf with space for link headers, in the event we forward 3453 * it. Otherwise, if it is aligned, make sure the entire base 3454 * IPv6 header is in the first mbuf of the chain. 3455 */ 3456 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3457 struct ifnet *inifp = m->m_pkthdr.rcvif; 3458 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3459 (max_linkhdr + 3) & ~3)) == NULL) { 3460 /* XXXJRT new stat, please */ 3461 IP6STAT_INC(ip6s_toosmall); 3462 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3463 goto bad; 3464 } 3465 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3466 struct ifnet *inifp = m->m_pkthdr.rcvif; 3467 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3468 IP6STAT_INC(ip6s_toosmall); 3469 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3470 goto bad; 3471 } 3472 } 3473 3474 ip6 = mtod(m, struct ip6_hdr *); 3475 3476 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3477 IP6STAT_INC(ip6s_badvers); 3478 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3479 goto bad; 3480 } 3481 3482 /* Checks out, proceed */ 3483 *mp = m; 3484 return (0); 3485 3486 bad: 3487 *mp = m; 3488 return (-1); 3489 } 3490 #endif /* INET6 */ 3491 3492 /* 3493 * bridge_fragment: 3494 * 3495 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3496 */ 3497 static int 3498 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3499 int snap, struct llc *llc) 3500 { 3501 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3502 struct ip *ip; 3503 int error = -1; 3504 3505 if (m->m_len < sizeof(struct ip) && 3506 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3507 goto dropit; 3508 ip = mtod(m, struct ip *); 3509 3510 m->m_pkthdr.csum_flags |= CSUM_IP; 3511 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3512 if (error) 3513 goto dropit; 3514 3515 /* 3516 * Walk the chain and re-add the Ethernet header for 3517 * each mbuf packet. 3518 */ 3519 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3520 nextpkt = mcur->m_nextpkt; 3521 mcur->m_nextpkt = NULL; 3522 if (snap) { 3523 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3524 if (mcur == NULL) { 3525 error = ENOBUFS; 3526 if (mprev != NULL) 3527 mprev->m_nextpkt = nextpkt; 3528 goto dropit; 3529 } 3530 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3531 } 3532 3533 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3534 if (mcur == NULL) { 3535 error = ENOBUFS; 3536 if (mprev != NULL) 3537 mprev->m_nextpkt = nextpkt; 3538 goto dropit; 3539 } 3540 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3541 3542 /* 3543 * The previous two M_PREPEND could have inserted one or two 3544 * mbufs in front so we have to update the previous packet's 3545 * m_nextpkt. 3546 */ 3547 mcur->m_nextpkt = nextpkt; 3548 if (mprev != NULL) 3549 mprev->m_nextpkt = mcur; 3550 else { 3551 /* The first mbuf in the original chain needs to be 3552 * updated. */ 3553 *mp = mcur; 3554 } 3555 mprev = mcur; 3556 } 3557 3558 KMOD_IPSTAT_INC(ips_fragmented); 3559 return (error); 3560 3561 dropit: 3562 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3563 m = mcur->m_nextpkt; 3564 m_freem(mcur); 3565 } 3566 return (error); 3567 } 3568 3569 static void 3570 bridge_linkstate(struct ifnet *ifp) 3571 { 3572 struct bridge_softc *sc = ifp->if_bridge; 3573 struct bridge_iflist *bif; 3574 3575 BRIDGE_LOCK(sc); 3576 bif = bridge_lookup_member_if(sc, ifp); 3577 if (bif == NULL) { 3578 BRIDGE_UNLOCK(sc); 3579 return; 3580 } 3581 bridge_linkcheck(sc); 3582 BRIDGE_UNLOCK(sc); 3583 3584 bstp_linkstate(&bif->bif_stp); 3585 } 3586 3587 static void 3588 bridge_linkcheck(struct bridge_softc *sc) 3589 { 3590 struct bridge_iflist *bif; 3591 int new_link, hasls; 3592 3593 BRIDGE_LOCK_ASSERT(sc); 3594 new_link = LINK_STATE_DOWN; 3595 hasls = 0; 3596 /* Our link is considered up if at least one of our ports is active */ 3597 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3598 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3599 hasls++; 3600 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3601 new_link = LINK_STATE_UP; 3602 break; 3603 } 3604 } 3605 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3606 /* If no interfaces support link-state then we default to up */ 3607 new_link = LINK_STATE_UP; 3608 } 3609 if_link_state_change(sc->sc_ifp, new_link); 3610 } 3611