1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/mbuf.h> 85 #include <sys/malloc.h> 86 #include <sys/protosw.h> 87 #include <sys/systm.h> 88 #include <sys/jail.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 104 #include <net/bpf.h> 105 #include <net/if.h> 106 #include <net/if_clone.h> 107 #include <net/if_dl.h> 108 #include <net/if_types.h> 109 #include <net/if_var.h> 110 #include <net/pfil.h> 111 #include <net/vnet.h> 112 113 #include <netinet/in.h> /* for struct arpcom */ 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #ifdef INET6 119 #include <netinet/ip6.h> 120 #include <netinet6/ip6_var.h> 121 #endif 122 #if defined(INET) || defined(INET6) 123 #include <netinet/ip_carp.h> 124 #endif 125 #include <machine/in_cksum.h> 126 #include <netinet/if_ether.h> /* for struct arpcom */ 127 #include <net/bridgestp.h> 128 #include <net/if_bridgevar.h> 129 #include <net/if_llc.h> 130 #include <net/if_vlan_var.h> 131 132 #include <net/route.h> 133 134 /* 135 * Size of the route hash table. Must be a power of two. 136 */ 137 #ifndef BRIDGE_RTHASH_SIZE 138 #define BRIDGE_RTHASH_SIZE 1024 139 #endif 140 141 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 142 143 /* 144 * Default maximum number of addresses to cache. 145 */ 146 #ifndef BRIDGE_RTABLE_MAX 147 #define BRIDGE_RTABLE_MAX 2000 148 #endif 149 150 /* 151 * Timeout (in seconds) for entries learned dynamically. 152 */ 153 #ifndef BRIDGE_RTABLE_TIMEOUT 154 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 155 #endif 156 157 /* 158 * Number of seconds between walks of the route list. 159 */ 160 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 161 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 162 #endif 163 164 /* 165 * List of capabilities to possibly mask on the member interface. 166 */ 167 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 168 169 /* 170 * List of capabilities to strip 171 */ 172 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 173 174 /* 175 * Bridge interface list entry. 176 */ 177 struct bridge_iflist { 178 LIST_ENTRY(bridge_iflist) bif_next; 179 struct ifnet *bif_ifp; /* member if */ 180 struct bstp_port bif_stp; /* STP state */ 181 uint32_t bif_flags; /* member if flags */ 182 int bif_savedcaps; /* saved capabilities */ 183 uint32_t bif_addrmax; /* max # of addresses */ 184 uint32_t bif_addrcnt; /* cur. # of addresses */ 185 uint32_t bif_addrexceeded;/* # of address violations */ 186 }; 187 188 /* 189 * Bridge route node. 190 */ 191 struct bridge_rtnode { 192 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 193 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 194 struct bridge_iflist *brt_dst; /* destination if */ 195 unsigned long brt_expire; /* expiration time */ 196 uint8_t brt_flags; /* address flags */ 197 uint8_t brt_addr[ETHER_ADDR_LEN]; 198 uint16_t brt_vlan; /* vlan id */ 199 }; 200 #define brt_ifp brt_dst->bif_ifp 201 202 /* 203 * Software state for each bridge. 204 */ 205 struct bridge_softc { 206 struct ifnet *sc_ifp; /* make this an interface */ 207 LIST_ENTRY(bridge_softc) sc_list; 208 struct mtx sc_mtx; 209 struct cv sc_cv; 210 uint32_t sc_brtmax; /* max # of addresses */ 211 uint32_t sc_brtcnt; /* cur. # of addresses */ 212 uint32_t sc_brttimeout; /* rt timeout in seconds */ 213 struct callout sc_brcallout; /* bridge callout */ 214 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 215 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 216 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 217 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 218 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 219 uint32_t sc_rthash_key; /* key for hash */ 220 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 221 struct bstp_state sc_stp; /* STP state */ 222 uint32_t sc_brtexceeded; /* # of cache drops */ 223 struct ifnet *sc_ifaddr; /* member mac copied from */ 224 u_char sc_defaddr[6]; /* Default MAC address */ 225 }; 226 227 static struct mtx bridge_list_mtx; 228 eventhandler_tag bridge_detach_cookie = NULL; 229 230 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 231 232 uma_zone_t bridge_rtnode_zone; 233 234 static int bridge_clone_create(struct if_clone *, int, caddr_t); 235 static void bridge_clone_destroy(struct ifnet *); 236 237 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 238 static void bridge_mutecaps(struct bridge_softc *); 239 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 240 int); 241 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 242 static void bridge_init(void *); 243 static void bridge_dummynet(struct mbuf *, struct ifnet *); 244 static void bridge_stop(struct ifnet *, int); 245 static int bridge_transmit(struct ifnet *, struct mbuf *); 246 static void bridge_qflush(struct ifnet *); 247 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 248 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 249 struct rtentry *); 250 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 251 struct mbuf *); 252 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 253 254 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 255 struct mbuf *m); 256 257 static void bridge_timer(void *); 258 259 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 260 struct mbuf *, int); 261 static void bridge_span(struct bridge_softc *, struct mbuf *); 262 263 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 264 uint16_t, struct bridge_iflist *, int, uint8_t); 265 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 266 uint16_t); 267 static void bridge_rttrim(struct bridge_softc *); 268 static void bridge_rtage(struct bridge_softc *); 269 static void bridge_rtflush(struct bridge_softc *, int); 270 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 271 uint16_t); 272 273 static void bridge_rtable_init(struct bridge_softc *); 274 static void bridge_rtable_fini(struct bridge_softc *); 275 276 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 277 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 278 const uint8_t *, uint16_t); 279 static int bridge_rtnode_insert(struct bridge_softc *, 280 struct bridge_rtnode *); 281 static void bridge_rtnode_destroy(struct bridge_softc *, 282 struct bridge_rtnode *); 283 static void bridge_rtable_expire(struct ifnet *, int); 284 static void bridge_state_change(struct ifnet *, int); 285 286 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 287 const char *name); 288 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 289 struct ifnet *ifp); 290 static void bridge_delete_member(struct bridge_softc *, 291 struct bridge_iflist *, int); 292 static void bridge_delete_span(struct bridge_softc *, 293 struct bridge_iflist *); 294 295 static int bridge_ioctl_add(struct bridge_softc *, void *); 296 static int bridge_ioctl_del(struct bridge_softc *, void *); 297 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 298 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 299 static int bridge_ioctl_scache(struct bridge_softc *, void *); 300 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 301 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 302 static int bridge_ioctl_rts(struct bridge_softc *, void *); 303 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 304 static int bridge_ioctl_sto(struct bridge_softc *, void *); 305 static int bridge_ioctl_gto(struct bridge_softc *, void *); 306 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 307 static int bridge_ioctl_flush(struct bridge_softc *, void *); 308 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 309 static int bridge_ioctl_spri(struct bridge_softc *, void *); 310 static int bridge_ioctl_ght(struct bridge_softc *, void *); 311 static int bridge_ioctl_sht(struct bridge_softc *, void *); 312 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 313 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 314 static int bridge_ioctl_gma(struct bridge_softc *, void *); 315 static int bridge_ioctl_sma(struct bridge_softc *, void *); 316 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 319 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 320 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 321 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 322 static int bridge_ioctl_grte(struct bridge_softc *, void *); 323 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 324 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 325 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 326 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 327 int); 328 static int bridge_ip_checkbasic(struct mbuf **mp); 329 #ifdef INET6 330 static int bridge_ip6_checkbasic(struct mbuf **mp); 331 #endif /* INET6 */ 332 static int bridge_fragment(struct ifnet *, struct mbuf *, 333 struct ether_header *, int, struct llc *); 334 static void bridge_linkstate(struct ifnet *ifp); 335 static void bridge_linkcheck(struct bridge_softc *sc); 336 337 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 338 339 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 340 #define VLANTAGOF(_m) \ 341 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 342 343 static struct bstp_cb_ops bridge_ops = { 344 .bcb_state = bridge_state_change, 345 .bcb_rtage = bridge_rtable_expire 346 }; 347 348 SYSCTL_DECL(_net_link); 349 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 350 351 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 352 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 353 static int pfil_member = 1; /* run pfil hooks on the member interface */ 354 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 355 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 356 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 357 locally destined packets */ 358 static int log_stp = 0; /* log STP state changes */ 359 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 360 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 362 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 363 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 365 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 366 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 368 &pfil_bridge, 0, "Packet filter on the bridge interface"); 369 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 370 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 371 &pfil_member, 0, "Packet filter on the member interface"); 372 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 373 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 374 &pfil_local_phys, 0, 375 "Packet filter on the physical interface for locally destined packets"); 376 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 377 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 378 &log_stp, 0, "Log STP state changes"); 379 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 380 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 381 &bridge_inherit_mac, 0, 382 "Inherit MAC address from the first bridge member"); 383 384 struct bridge_control { 385 int (*bc_func)(struct bridge_softc *, void *); 386 int bc_argsize; 387 int bc_flags; 388 }; 389 390 #define BC_F_COPYIN 0x01 /* copy arguments in */ 391 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 392 #define BC_F_SUSER 0x04 /* do super-user check */ 393 394 const struct bridge_control bridge_control_table[] = { 395 { bridge_ioctl_add, sizeof(struct ifbreq), 396 BC_F_COPYIN|BC_F_SUSER }, 397 { bridge_ioctl_del, sizeof(struct ifbreq), 398 BC_F_COPYIN|BC_F_SUSER }, 399 400 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 401 BC_F_COPYIN|BC_F_COPYOUT }, 402 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 403 BC_F_COPYIN|BC_F_SUSER }, 404 405 { bridge_ioctl_scache, sizeof(struct ifbrparam), 406 BC_F_COPYIN|BC_F_SUSER }, 407 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 408 BC_F_COPYOUT }, 409 410 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 411 BC_F_COPYIN|BC_F_COPYOUT }, 412 { bridge_ioctl_rts, sizeof(struct ifbaconf), 413 BC_F_COPYIN|BC_F_COPYOUT }, 414 415 { bridge_ioctl_saddr, sizeof(struct ifbareq), 416 BC_F_COPYIN|BC_F_SUSER }, 417 418 { bridge_ioctl_sto, sizeof(struct ifbrparam), 419 BC_F_COPYIN|BC_F_SUSER }, 420 { bridge_ioctl_gto, sizeof(struct ifbrparam), 421 BC_F_COPYOUT }, 422 423 { bridge_ioctl_daddr, sizeof(struct ifbareq), 424 BC_F_COPYIN|BC_F_SUSER }, 425 426 { bridge_ioctl_flush, sizeof(struct ifbreq), 427 BC_F_COPYIN|BC_F_SUSER }, 428 429 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 430 BC_F_COPYOUT }, 431 { bridge_ioctl_spri, sizeof(struct ifbrparam), 432 BC_F_COPYIN|BC_F_SUSER }, 433 434 { bridge_ioctl_ght, sizeof(struct ifbrparam), 435 BC_F_COPYOUT }, 436 { bridge_ioctl_sht, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 439 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 440 BC_F_COPYOUT }, 441 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 442 BC_F_COPYIN|BC_F_SUSER }, 443 444 { bridge_ioctl_gma, sizeof(struct ifbrparam), 445 BC_F_COPYOUT }, 446 { bridge_ioctl_sma, sizeof(struct ifbrparam), 447 BC_F_COPYIN|BC_F_SUSER }, 448 449 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 450 BC_F_COPYIN|BC_F_SUSER }, 451 452 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 453 BC_F_COPYIN|BC_F_SUSER }, 454 455 { bridge_ioctl_addspan, sizeof(struct ifbreq), 456 BC_F_COPYIN|BC_F_SUSER }, 457 { bridge_ioctl_delspan, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 461 BC_F_COPYOUT }, 462 463 { bridge_ioctl_grte, sizeof(struct ifbrparam), 464 BC_F_COPYOUT }, 465 466 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 467 BC_F_COPYIN|BC_F_COPYOUT }, 468 469 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 470 BC_F_COPYIN|BC_F_SUSER }, 471 472 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 473 BC_F_COPYIN|BC_F_SUSER }, 474 475 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 476 BC_F_COPYIN|BC_F_SUSER }, 477 478 }; 479 const int bridge_control_table_size = 480 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 481 482 LIST_HEAD(, bridge_softc) bridge_list; 483 484 static struct if_clone *bridge_cloner; 485 static const char bridge_name[] = "bridge"; 486 487 static int 488 bridge_modevent(module_t mod, int type, void *data) 489 { 490 491 switch (type) { 492 case MOD_LOAD: 493 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 494 bridge_cloner = if_clone_simple(bridge_name, 495 bridge_clone_create, bridge_clone_destroy, 0); 496 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 497 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 498 UMA_ALIGN_PTR, 0); 499 LIST_INIT(&bridge_list); 500 bridge_input_p = bridge_input; 501 bridge_output_p = bridge_output; 502 bridge_dn_p = bridge_dummynet; 503 bridge_linkstate_p = bridge_linkstate; 504 bridge_detach_cookie = EVENTHANDLER_REGISTER( 505 ifnet_departure_event, bridge_ifdetach, NULL, 506 EVENTHANDLER_PRI_ANY); 507 break; 508 case MOD_UNLOAD: 509 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 510 bridge_detach_cookie); 511 if_clone_detach(bridge_cloner); 512 uma_zdestroy(bridge_rtnode_zone); 513 bridge_input_p = NULL; 514 bridge_output_p = NULL; 515 bridge_dn_p = NULL; 516 bridge_linkstate_p = NULL; 517 mtx_destroy(&bridge_list_mtx); 518 break; 519 default: 520 return (EOPNOTSUPP); 521 } 522 return (0); 523 } 524 525 static moduledata_t bridge_mod = { 526 "if_bridge", 527 bridge_modevent, 528 0 529 }; 530 531 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 532 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 533 534 /* 535 * handler for net.link.bridge.pfil_ipfw 536 */ 537 static int 538 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 539 { 540 int enable = pfil_ipfw; 541 int error; 542 543 error = sysctl_handle_int(oidp, &enable, 0, req); 544 enable = (enable) ? 1 : 0; 545 546 if (enable != pfil_ipfw) { 547 pfil_ipfw = enable; 548 549 /* 550 * Disable pfil so that ipfw doesnt run twice, if the user 551 * really wants both then they can re-enable pfil_bridge and/or 552 * pfil_member. Also allow non-ip packets as ipfw can filter by 553 * layer2 type. 554 */ 555 if (pfil_ipfw) { 556 pfil_onlyip = 0; 557 pfil_bridge = 0; 558 pfil_member = 0; 559 } 560 } 561 562 return (error); 563 } 564 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 565 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 566 567 /* 568 * bridge_clone_create: 569 * 570 * Create a new bridge instance. 571 */ 572 static int 573 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 574 { 575 struct bridge_softc *sc, *sc2; 576 struct ifnet *bifp, *ifp; 577 int fb, retry; 578 unsigned long hostid; 579 580 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 581 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 582 if (ifp == NULL) { 583 free(sc, M_DEVBUF); 584 return (ENOSPC); 585 } 586 587 BRIDGE_LOCK_INIT(sc); 588 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 589 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 590 591 /* Initialize our routing table. */ 592 bridge_rtable_init(sc); 593 594 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 595 596 LIST_INIT(&sc->sc_iflist); 597 LIST_INIT(&sc->sc_spanlist); 598 599 ifp->if_softc = sc; 600 if_initname(ifp, bridge_name, unit); 601 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 602 ifp->if_ioctl = bridge_ioctl; 603 ifp->if_transmit = bridge_transmit; 604 ifp->if_qflush = bridge_qflush; 605 ifp->if_init = bridge_init; 606 ifp->if_type = IFT_BRIDGE; 607 608 /* 609 * Generate an ethernet address with a locally administered address. 610 * 611 * Since we are using random ethernet addresses for the bridge, it is 612 * possible that we might have address collisions, so make sure that 613 * this hardware address isn't already in use on another bridge. 614 * The first try uses the hostid and falls back to arc4rand(). 615 */ 616 fb = 0; 617 getcredhostid(curthread->td_ucred, &hostid); 618 for (retry = 1; retry != 0;) { 619 if (fb || hostid == 0) { 620 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 621 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 622 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 623 } else { 624 sc->sc_defaddr[0] = 0x2; 625 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 626 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 627 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 628 sc->sc_defaddr[4] = hostid & 0xff; 629 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 630 } 631 632 fb = 1; 633 retry = 0; 634 mtx_lock(&bridge_list_mtx); 635 LIST_FOREACH(sc2, &bridge_list, sc_list) { 636 bifp = sc2->sc_ifp; 637 if (memcmp(sc->sc_defaddr, 638 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 639 retry = 1; 640 } 641 mtx_unlock(&bridge_list_mtx); 642 } 643 644 bstp_attach(&sc->sc_stp, &bridge_ops); 645 ether_ifattach(ifp, sc->sc_defaddr); 646 /* Now undo some of the damage... */ 647 ifp->if_baudrate = 0; 648 ifp->if_type = IFT_BRIDGE; 649 650 mtx_lock(&bridge_list_mtx); 651 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 652 mtx_unlock(&bridge_list_mtx); 653 654 return (0); 655 } 656 657 /* 658 * bridge_clone_destroy: 659 * 660 * Destroy a bridge instance. 661 */ 662 static void 663 bridge_clone_destroy(struct ifnet *ifp) 664 { 665 struct bridge_softc *sc = ifp->if_softc; 666 struct bridge_iflist *bif; 667 668 BRIDGE_LOCK(sc); 669 670 bridge_stop(ifp, 1); 671 ifp->if_flags &= ~IFF_UP; 672 673 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 674 bridge_delete_member(sc, bif, 0); 675 676 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 677 bridge_delete_span(sc, bif); 678 } 679 680 BRIDGE_UNLOCK(sc); 681 682 callout_drain(&sc->sc_brcallout); 683 684 mtx_lock(&bridge_list_mtx); 685 LIST_REMOVE(sc, sc_list); 686 mtx_unlock(&bridge_list_mtx); 687 688 bstp_detach(&sc->sc_stp); 689 ether_ifdetach(ifp); 690 if_free(ifp); 691 692 /* Tear down the routing table. */ 693 bridge_rtable_fini(sc); 694 695 BRIDGE_LOCK_DESTROY(sc); 696 free(sc, M_DEVBUF); 697 } 698 699 /* 700 * bridge_ioctl: 701 * 702 * Handle a control request from the operator. 703 */ 704 static int 705 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 706 { 707 struct bridge_softc *sc = ifp->if_softc; 708 struct ifreq *ifr = (struct ifreq *)data; 709 struct bridge_iflist *bif; 710 struct thread *td = curthread; 711 union { 712 struct ifbreq ifbreq; 713 struct ifbifconf ifbifconf; 714 struct ifbareq ifbareq; 715 struct ifbaconf ifbaconf; 716 struct ifbrparam ifbrparam; 717 struct ifbropreq ifbropreq; 718 } args; 719 struct ifdrv *ifd = (struct ifdrv *) data; 720 const struct bridge_control *bc; 721 int error = 0; 722 723 switch (cmd) { 724 725 case SIOCADDMULTI: 726 case SIOCDELMULTI: 727 break; 728 729 case SIOCGDRVSPEC: 730 case SIOCSDRVSPEC: 731 if (ifd->ifd_cmd >= bridge_control_table_size) { 732 error = EINVAL; 733 break; 734 } 735 bc = &bridge_control_table[ifd->ifd_cmd]; 736 737 if (cmd == SIOCGDRVSPEC && 738 (bc->bc_flags & BC_F_COPYOUT) == 0) { 739 error = EINVAL; 740 break; 741 } 742 else if (cmd == SIOCSDRVSPEC && 743 (bc->bc_flags & BC_F_COPYOUT) != 0) { 744 error = EINVAL; 745 break; 746 } 747 748 if (bc->bc_flags & BC_F_SUSER) { 749 error = priv_check(td, PRIV_NET_BRIDGE); 750 if (error) 751 break; 752 } 753 754 if (ifd->ifd_len != bc->bc_argsize || 755 ifd->ifd_len > sizeof(args)) { 756 error = EINVAL; 757 break; 758 } 759 760 bzero(&args, sizeof(args)); 761 if (bc->bc_flags & BC_F_COPYIN) { 762 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 763 if (error) 764 break; 765 } 766 767 BRIDGE_LOCK(sc); 768 error = (*bc->bc_func)(sc, &args); 769 BRIDGE_UNLOCK(sc); 770 if (error) 771 break; 772 773 if (bc->bc_flags & BC_F_COPYOUT) 774 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 775 776 break; 777 778 case SIOCSIFFLAGS: 779 if (!(ifp->if_flags & IFF_UP) && 780 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 781 /* 782 * If interface is marked down and it is running, 783 * then stop and disable it. 784 */ 785 BRIDGE_LOCK(sc); 786 bridge_stop(ifp, 1); 787 BRIDGE_UNLOCK(sc); 788 } else if ((ifp->if_flags & IFF_UP) && 789 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 790 /* 791 * If interface is marked up and it is stopped, then 792 * start it. 793 */ 794 (*ifp->if_init)(sc); 795 } 796 break; 797 798 case SIOCSIFMTU: 799 if (ifr->ifr_mtu < 576) { 800 error = EINVAL; 801 break; 802 } 803 if (LIST_EMPTY(&sc->sc_iflist)) { 804 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 805 break; 806 } 807 BRIDGE_LOCK(sc); 808 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 809 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 810 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 811 " != %d\n", sc->sc_ifp->if_xname, 812 bif->bif_ifp->if_mtu, 813 bif->bif_ifp->if_xname, ifr->ifr_mtu); 814 error = EINVAL; 815 break; 816 } 817 } 818 if (!error) 819 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 820 BRIDGE_UNLOCK(sc); 821 break; 822 default: 823 /* 824 * drop the lock as ether_ioctl() will call bridge_start() and 825 * cause the lock to be recursed. 826 */ 827 error = ether_ioctl(ifp, cmd, data); 828 break; 829 } 830 831 return (error); 832 } 833 834 /* 835 * bridge_mutecaps: 836 * 837 * Clear or restore unwanted capabilities on the member interface 838 */ 839 static void 840 bridge_mutecaps(struct bridge_softc *sc) 841 { 842 struct bridge_iflist *bif; 843 int enabled, mask; 844 845 /* Initial bitmask of capabilities to test */ 846 mask = BRIDGE_IFCAPS_MASK; 847 848 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 849 /* Every member must support it or its disabled */ 850 mask &= bif->bif_savedcaps; 851 } 852 853 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 854 enabled = bif->bif_ifp->if_capenable; 855 enabled &= ~BRIDGE_IFCAPS_STRIP; 856 /* strip off mask bits and enable them again if allowed */ 857 enabled &= ~BRIDGE_IFCAPS_MASK; 858 enabled |= mask; 859 bridge_set_ifcap(sc, bif, enabled); 860 } 861 862 } 863 864 static void 865 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 866 { 867 struct ifnet *ifp = bif->bif_ifp; 868 struct ifreq ifr; 869 int error; 870 871 bzero(&ifr, sizeof(ifr)); 872 ifr.ifr_reqcap = set; 873 874 if (ifp->if_capenable != set) { 875 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 876 if (error) 877 if_printf(sc->sc_ifp, 878 "error setting interface capabilities on %s\n", 879 ifp->if_xname); 880 } 881 } 882 883 /* 884 * bridge_lookup_member: 885 * 886 * Lookup a bridge member interface. 887 */ 888 static struct bridge_iflist * 889 bridge_lookup_member(struct bridge_softc *sc, const char *name) 890 { 891 struct bridge_iflist *bif; 892 struct ifnet *ifp; 893 894 BRIDGE_LOCK_ASSERT(sc); 895 896 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 897 ifp = bif->bif_ifp; 898 if (strcmp(ifp->if_xname, name) == 0) 899 return (bif); 900 } 901 902 return (NULL); 903 } 904 905 /* 906 * bridge_lookup_member_if: 907 * 908 * Lookup a bridge member interface by ifnet*. 909 */ 910 static struct bridge_iflist * 911 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 912 { 913 struct bridge_iflist *bif; 914 915 BRIDGE_LOCK_ASSERT(sc); 916 917 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 918 if (bif->bif_ifp == member_ifp) 919 return (bif); 920 } 921 922 return (NULL); 923 } 924 925 /* 926 * bridge_delete_member: 927 * 928 * Delete the specified member interface. 929 */ 930 static void 931 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 932 int gone) 933 { 934 struct ifnet *ifs = bif->bif_ifp; 935 struct ifnet *fif = NULL; 936 937 BRIDGE_LOCK_ASSERT(sc); 938 939 if (bif->bif_flags & IFBIF_STP) 940 bstp_disable(&bif->bif_stp); 941 942 ifs->if_bridge = NULL; 943 BRIDGE_XLOCK(sc); 944 LIST_REMOVE(bif, bif_next); 945 BRIDGE_XDROP(sc); 946 947 /* 948 * If removing the interface that gave the bridge its mac address, set 949 * the mac address of the bridge to the address of the next member, or 950 * to its default address if no members are left. 951 */ 952 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 953 if (LIST_EMPTY(&sc->sc_iflist)) { 954 bcopy(sc->sc_defaddr, 955 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 956 sc->sc_ifaddr = NULL; 957 } else { 958 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 959 bcopy(IF_LLADDR(fif), 960 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 961 sc->sc_ifaddr = fif; 962 } 963 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 964 } 965 966 bridge_linkcheck(sc); 967 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 968 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 969 KASSERT(bif->bif_addrcnt == 0, 970 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 971 972 BRIDGE_UNLOCK(sc); 973 if (!gone) { 974 switch (ifs->if_type) { 975 case IFT_ETHER: 976 case IFT_L2VLAN: 977 /* 978 * Take the interface out of promiscuous mode. 979 */ 980 (void) ifpromisc(ifs, 0); 981 break; 982 983 case IFT_GIF: 984 break; 985 986 default: 987 #ifdef DIAGNOSTIC 988 panic("bridge_delete_member: impossible"); 989 #endif 990 break; 991 } 992 /* reneable any interface capabilities */ 993 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 994 } 995 bstp_destroy(&bif->bif_stp); /* prepare to free */ 996 BRIDGE_LOCK(sc); 997 free(bif, M_DEVBUF); 998 } 999 1000 /* 1001 * bridge_delete_span: 1002 * 1003 * Delete the specified span interface. 1004 */ 1005 static void 1006 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1007 { 1008 BRIDGE_LOCK_ASSERT(sc); 1009 1010 KASSERT(bif->bif_ifp->if_bridge == NULL, 1011 ("%s: not a span interface", __func__)); 1012 1013 LIST_REMOVE(bif, bif_next); 1014 free(bif, M_DEVBUF); 1015 } 1016 1017 static int 1018 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1019 { 1020 struct ifbreq *req = arg; 1021 struct bridge_iflist *bif = NULL; 1022 struct ifnet *ifs; 1023 int error = 0; 1024 1025 ifs = ifunit(req->ifbr_ifsname); 1026 if (ifs == NULL) 1027 return (ENOENT); 1028 if (ifs->if_ioctl == NULL) /* must be supported */ 1029 return (EINVAL); 1030 1031 /* If it's in the span list, it can't be a member. */ 1032 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1033 if (ifs == bif->bif_ifp) 1034 return (EBUSY); 1035 1036 if (ifs->if_bridge == sc) 1037 return (EEXIST); 1038 1039 if (ifs->if_bridge != NULL) 1040 return (EBUSY); 1041 1042 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1043 if (bif == NULL) 1044 return (ENOMEM); 1045 1046 bif->bif_ifp = ifs; 1047 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1048 bif->bif_savedcaps = ifs->if_capenable; 1049 1050 switch (ifs->if_type) { 1051 case IFT_ETHER: 1052 case IFT_L2VLAN: 1053 case IFT_GIF: 1054 /* permitted interface types */ 1055 break; 1056 default: 1057 error = EINVAL; 1058 goto out; 1059 } 1060 1061 /* Allow the first Ethernet member to define the MTU */ 1062 if (LIST_EMPTY(&sc->sc_iflist)) 1063 sc->sc_ifp->if_mtu = ifs->if_mtu; 1064 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1065 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1066 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1067 error = EINVAL; 1068 goto out; 1069 } 1070 1071 /* 1072 * Assign the interface's MAC address to the bridge if it's the first 1073 * member and the MAC address of the bridge has not been changed from 1074 * the default randomly generated one. 1075 */ 1076 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1077 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1078 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1079 sc->sc_ifaddr = ifs; 1080 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1081 } 1082 1083 ifs->if_bridge = sc; 1084 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1085 /* 1086 * XXX: XLOCK HERE!?! 1087 * 1088 * NOTE: insert_***HEAD*** should be safe for the traversals. 1089 */ 1090 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1091 1092 /* Set interface capabilities to the intersection set of all members */ 1093 bridge_mutecaps(sc); 1094 bridge_linkcheck(sc); 1095 1096 /* Place the interface into promiscuous mode */ 1097 switch (ifs->if_type) { 1098 case IFT_ETHER: 1099 case IFT_L2VLAN: 1100 BRIDGE_UNLOCK(sc); 1101 error = ifpromisc(ifs, 1); 1102 BRIDGE_LOCK(sc); 1103 break; 1104 } 1105 if (error) 1106 bridge_delete_member(sc, bif, 0); 1107 out: 1108 if (error) { 1109 if (bif != NULL) 1110 free(bif, M_DEVBUF); 1111 } 1112 return (error); 1113 } 1114 1115 static int 1116 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1117 { 1118 struct ifbreq *req = arg; 1119 struct bridge_iflist *bif; 1120 1121 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1122 if (bif == NULL) 1123 return (ENOENT); 1124 1125 bridge_delete_member(sc, bif, 0); 1126 1127 return (0); 1128 } 1129 1130 static int 1131 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1132 { 1133 struct ifbreq *req = arg; 1134 struct bridge_iflist *bif; 1135 struct bstp_port *bp; 1136 1137 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1138 if (bif == NULL) 1139 return (ENOENT); 1140 1141 bp = &bif->bif_stp; 1142 req->ifbr_ifsflags = bif->bif_flags; 1143 req->ifbr_state = bp->bp_state; 1144 req->ifbr_priority = bp->bp_priority; 1145 req->ifbr_path_cost = bp->bp_path_cost; 1146 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1147 req->ifbr_proto = bp->bp_protover; 1148 req->ifbr_role = bp->bp_role; 1149 req->ifbr_stpflags = bp->bp_flags; 1150 req->ifbr_addrcnt = bif->bif_addrcnt; 1151 req->ifbr_addrmax = bif->bif_addrmax; 1152 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1153 1154 /* Copy STP state options as flags */ 1155 if (bp->bp_operedge) 1156 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1157 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1158 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1159 if (bp->bp_ptp_link) 1160 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1161 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1162 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1163 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1164 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1165 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1166 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1167 return (0); 1168 } 1169 1170 static int 1171 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1172 { 1173 struct ifbreq *req = arg; 1174 struct bridge_iflist *bif; 1175 struct bstp_port *bp; 1176 int error; 1177 1178 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1179 if (bif == NULL) 1180 return (ENOENT); 1181 bp = &bif->bif_stp; 1182 1183 if (req->ifbr_ifsflags & IFBIF_SPAN) 1184 /* SPAN is readonly */ 1185 return (EINVAL); 1186 1187 if (req->ifbr_ifsflags & IFBIF_STP) { 1188 if ((bif->bif_flags & IFBIF_STP) == 0) { 1189 error = bstp_enable(&bif->bif_stp); 1190 if (error) 1191 return (error); 1192 } 1193 } else { 1194 if ((bif->bif_flags & IFBIF_STP) != 0) 1195 bstp_disable(&bif->bif_stp); 1196 } 1197 1198 /* Pass on STP flags */ 1199 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1200 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1201 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1202 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1203 1204 /* Save the bits relating to the bridge */ 1205 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1206 1207 return (0); 1208 } 1209 1210 static int 1211 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1212 { 1213 struct ifbrparam *param = arg; 1214 1215 sc->sc_brtmax = param->ifbrp_csize; 1216 bridge_rttrim(sc); 1217 1218 return (0); 1219 } 1220 1221 static int 1222 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1223 { 1224 struct ifbrparam *param = arg; 1225 1226 param->ifbrp_csize = sc->sc_brtmax; 1227 1228 return (0); 1229 } 1230 1231 static int 1232 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1233 { 1234 struct ifbifconf *bifc = arg; 1235 struct bridge_iflist *bif; 1236 struct ifbreq breq; 1237 char *buf, *outbuf; 1238 int count, buflen, len, error = 0; 1239 1240 count = 0; 1241 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1242 count++; 1243 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1244 count++; 1245 1246 buflen = sizeof(breq) * count; 1247 if (bifc->ifbic_len == 0) { 1248 bifc->ifbic_len = buflen; 1249 return (0); 1250 } 1251 BRIDGE_UNLOCK(sc); 1252 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1253 BRIDGE_LOCK(sc); 1254 1255 count = 0; 1256 buf = outbuf; 1257 len = min(bifc->ifbic_len, buflen); 1258 bzero(&breq, sizeof(breq)); 1259 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1260 if (len < sizeof(breq)) 1261 break; 1262 1263 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1264 sizeof(breq.ifbr_ifsname)); 1265 /* Fill in the ifbreq structure */ 1266 error = bridge_ioctl_gifflags(sc, &breq); 1267 if (error) 1268 break; 1269 memcpy(buf, &breq, sizeof(breq)); 1270 count++; 1271 buf += sizeof(breq); 1272 len -= sizeof(breq); 1273 } 1274 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1275 if (len < sizeof(breq)) 1276 break; 1277 1278 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1279 sizeof(breq.ifbr_ifsname)); 1280 breq.ifbr_ifsflags = bif->bif_flags; 1281 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1282 memcpy(buf, &breq, sizeof(breq)); 1283 count++; 1284 buf += sizeof(breq); 1285 len -= sizeof(breq); 1286 } 1287 1288 BRIDGE_UNLOCK(sc); 1289 bifc->ifbic_len = sizeof(breq) * count; 1290 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1291 BRIDGE_LOCK(sc); 1292 free(outbuf, M_TEMP); 1293 return (error); 1294 } 1295 1296 static int 1297 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1298 { 1299 struct ifbaconf *bac = arg; 1300 struct bridge_rtnode *brt; 1301 struct ifbareq bareq; 1302 char *buf, *outbuf; 1303 int count, buflen, len, error = 0; 1304 1305 if (bac->ifbac_len == 0) 1306 return (0); 1307 1308 count = 0; 1309 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1310 count++; 1311 buflen = sizeof(bareq) * count; 1312 1313 BRIDGE_UNLOCK(sc); 1314 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1315 BRIDGE_LOCK(sc); 1316 1317 count = 0; 1318 buf = outbuf; 1319 len = min(bac->ifbac_len, buflen); 1320 bzero(&bareq, sizeof(bareq)); 1321 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1322 if (len < sizeof(bareq)) 1323 goto out; 1324 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1325 sizeof(bareq.ifba_ifsname)); 1326 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1327 bareq.ifba_vlan = brt->brt_vlan; 1328 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1329 time_uptime < brt->brt_expire) 1330 bareq.ifba_expire = brt->brt_expire - time_uptime; 1331 else 1332 bareq.ifba_expire = 0; 1333 bareq.ifba_flags = brt->brt_flags; 1334 1335 memcpy(buf, &bareq, sizeof(bareq)); 1336 count++; 1337 buf += sizeof(bareq); 1338 len -= sizeof(bareq); 1339 } 1340 out: 1341 BRIDGE_UNLOCK(sc); 1342 bac->ifbac_len = sizeof(bareq) * count; 1343 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1344 BRIDGE_LOCK(sc); 1345 free(outbuf, M_TEMP); 1346 return (error); 1347 } 1348 1349 static int 1350 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1351 { 1352 struct ifbareq *req = arg; 1353 struct bridge_iflist *bif; 1354 int error; 1355 1356 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1357 if (bif == NULL) 1358 return (ENOENT); 1359 1360 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1361 req->ifba_flags); 1362 1363 return (error); 1364 } 1365 1366 static int 1367 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1368 { 1369 struct ifbrparam *param = arg; 1370 1371 sc->sc_brttimeout = param->ifbrp_ctime; 1372 return (0); 1373 } 1374 1375 static int 1376 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1377 { 1378 struct ifbrparam *param = arg; 1379 1380 param->ifbrp_ctime = sc->sc_brttimeout; 1381 return (0); 1382 } 1383 1384 static int 1385 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1386 { 1387 struct ifbareq *req = arg; 1388 1389 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1390 } 1391 1392 static int 1393 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1394 { 1395 struct ifbreq *req = arg; 1396 1397 bridge_rtflush(sc, req->ifbr_ifsflags); 1398 return (0); 1399 } 1400 1401 static int 1402 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1403 { 1404 struct ifbrparam *param = arg; 1405 struct bstp_state *bs = &sc->sc_stp; 1406 1407 param->ifbrp_prio = bs->bs_bridge_priority; 1408 return (0); 1409 } 1410 1411 static int 1412 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1413 { 1414 struct ifbrparam *param = arg; 1415 1416 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1417 } 1418 1419 static int 1420 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1421 { 1422 struct ifbrparam *param = arg; 1423 struct bstp_state *bs = &sc->sc_stp; 1424 1425 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1426 return (0); 1427 } 1428 1429 static int 1430 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1431 { 1432 struct ifbrparam *param = arg; 1433 1434 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1435 } 1436 1437 static int 1438 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1439 { 1440 struct ifbrparam *param = arg; 1441 struct bstp_state *bs = &sc->sc_stp; 1442 1443 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1444 return (0); 1445 } 1446 1447 static int 1448 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1449 { 1450 struct ifbrparam *param = arg; 1451 1452 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1453 } 1454 1455 static int 1456 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1457 { 1458 struct ifbrparam *param = arg; 1459 struct bstp_state *bs = &sc->sc_stp; 1460 1461 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1462 return (0); 1463 } 1464 1465 static int 1466 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1467 { 1468 struct ifbrparam *param = arg; 1469 1470 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1471 } 1472 1473 static int 1474 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1475 { 1476 struct ifbreq *req = arg; 1477 struct bridge_iflist *bif; 1478 1479 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1480 if (bif == NULL) 1481 return (ENOENT); 1482 1483 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1484 } 1485 1486 static int 1487 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1488 { 1489 struct ifbreq *req = arg; 1490 struct bridge_iflist *bif; 1491 1492 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1493 if (bif == NULL) 1494 return (ENOENT); 1495 1496 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1497 } 1498 1499 static int 1500 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1501 { 1502 struct ifbreq *req = arg; 1503 struct bridge_iflist *bif; 1504 1505 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1506 if (bif == NULL) 1507 return (ENOENT); 1508 1509 bif->bif_addrmax = req->ifbr_addrmax; 1510 return (0); 1511 } 1512 1513 static int 1514 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1515 { 1516 struct ifbreq *req = arg; 1517 struct bridge_iflist *bif = NULL; 1518 struct ifnet *ifs; 1519 1520 ifs = ifunit(req->ifbr_ifsname); 1521 if (ifs == NULL) 1522 return (ENOENT); 1523 1524 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1525 if (ifs == bif->bif_ifp) 1526 return (EBUSY); 1527 1528 if (ifs->if_bridge != NULL) 1529 return (EBUSY); 1530 1531 switch (ifs->if_type) { 1532 case IFT_ETHER: 1533 case IFT_GIF: 1534 case IFT_L2VLAN: 1535 break; 1536 default: 1537 return (EINVAL); 1538 } 1539 1540 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1541 if (bif == NULL) 1542 return (ENOMEM); 1543 1544 bif->bif_ifp = ifs; 1545 bif->bif_flags = IFBIF_SPAN; 1546 1547 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1548 1549 return (0); 1550 } 1551 1552 static int 1553 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1554 { 1555 struct ifbreq *req = arg; 1556 struct bridge_iflist *bif; 1557 struct ifnet *ifs; 1558 1559 ifs = ifunit(req->ifbr_ifsname); 1560 if (ifs == NULL) 1561 return (ENOENT); 1562 1563 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1564 if (ifs == bif->bif_ifp) 1565 break; 1566 1567 if (bif == NULL) 1568 return (ENOENT); 1569 1570 bridge_delete_span(sc, bif); 1571 1572 return (0); 1573 } 1574 1575 static int 1576 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1577 { 1578 struct ifbropreq *req = arg; 1579 struct bstp_state *bs = &sc->sc_stp; 1580 struct bstp_port *root_port; 1581 1582 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1583 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1584 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1585 1586 root_port = bs->bs_root_port; 1587 if (root_port == NULL) 1588 req->ifbop_root_port = 0; 1589 else 1590 req->ifbop_root_port = root_port->bp_ifp->if_index; 1591 1592 req->ifbop_holdcount = bs->bs_txholdcount; 1593 req->ifbop_priority = bs->bs_bridge_priority; 1594 req->ifbop_protocol = bs->bs_protover; 1595 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1596 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1597 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1598 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1599 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1600 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1601 1602 return (0); 1603 } 1604 1605 static int 1606 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1607 { 1608 struct ifbrparam *param = arg; 1609 1610 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1611 return (0); 1612 } 1613 1614 static int 1615 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1616 { 1617 struct ifbpstpconf *bifstp = arg; 1618 struct bridge_iflist *bif; 1619 struct bstp_port *bp; 1620 struct ifbpstpreq bpreq; 1621 char *buf, *outbuf; 1622 int count, buflen, len, error = 0; 1623 1624 count = 0; 1625 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1626 if ((bif->bif_flags & IFBIF_STP) != 0) 1627 count++; 1628 } 1629 1630 buflen = sizeof(bpreq) * count; 1631 if (bifstp->ifbpstp_len == 0) { 1632 bifstp->ifbpstp_len = buflen; 1633 return (0); 1634 } 1635 1636 BRIDGE_UNLOCK(sc); 1637 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1638 BRIDGE_LOCK(sc); 1639 1640 count = 0; 1641 buf = outbuf; 1642 len = min(bifstp->ifbpstp_len, buflen); 1643 bzero(&bpreq, sizeof(bpreq)); 1644 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1645 if (len < sizeof(bpreq)) 1646 break; 1647 1648 if ((bif->bif_flags & IFBIF_STP) == 0) 1649 continue; 1650 1651 bp = &bif->bif_stp; 1652 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1653 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1654 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1655 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1656 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1657 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1658 1659 memcpy(buf, &bpreq, sizeof(bpreq)); 1660 count++; 1661 buf += sizeof(bpreq); 1662 len -= sizeof(bpreq); 1663 } 1664 1665 BRIDGE_UNLOCK(sc); 1666 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1667 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1668 BRIDGE_LOCK(sc); 1669 free(outbuf, M_TEMP); 1670 return (error); 1671 } 1672 1673 static int 1674 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1675 { 1676 struct ifbrparam *param = arg; 1677 1678 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1679 } 1680 1681 static int 1682 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1683 { 1684 struct ifbrparam *param = arg; 1685 1686 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1687 } 1688 1689 /* 1690 * bridge_ifdetach: 1691 * 1692 * Detach an interface from a bridge. Called when a member 1693 * interface is detaching. 1694 */ 1695 static void 1696 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1697 { 1698 struct bridge_softc *sc = ifp->if_bridge; 1699 struct bridge_iflist *bif; 1700 1701 /* Check if the interface is a bridge member */ 1702 if (sc != NULL) { 1703 BRIDGE_LOCK(sc); 1704 1705 bif = bridge_lookup_member_if(sc, ifp); 1706 if (bif != NULL) 1707 bridge_delete_member(sc, bif, 1); 1708 1709 BRIDGE_UNLOCK(sc); 1710 return; 1711 } 1712 1713 /* Check if the interface is a span port */ 1714 mtx_lock(&bridge_list_mtx); 1715 LIST_FOREACH(sc, &bridge_list, sc_list) { 1716 BRIDGE_LOCK(sc); 1717 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1718 if (ifp == bif->bif_ifp) { 1719 bridge_delete_span(sc, bif); 1720 break; 1721 } 1722 1723 BRIDGE_UNLOCK(sc); 1724 } 1725 mtx_unlock(&bridge_list_mtx); 1726 } 1727 1728 /* 1729 * bridge_init: 1730 * 1731 * Initialize a bridge interface. 1732 */ 1733 static void 1734 bridge_init(void *xsc) 1735 { 1736 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1737 struct ifnet *ifp = sc->sc_ifp; 1738 1739 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1740 return; 1741 1742 BRIDGE_LOCK(sc); 1743 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1744 bridge_timer, sc); 1745 1746 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1747 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1748 1749 BRIDGE_UNLOCK(sc); 1750 } 1751 1752 /* 1753 * bridge_stop: 1754 * 1755 * Stop the bridge interface. 1756 */ 1757 static void 1758 bridge_stop(struct ifnet *ifp, int disable) 1759 { 1760 struct bridge_softc *sc = ifp->if_softc; 1761 1762 BRIDGE_LOCK_ASSERT(sc); 1763 1764 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1765 return; 1766 1767 callout_stop(&sc->sc_brcallout); 1768 bstp_stop(&sc->sc_stp); 1769 1770 bridge_rtflush(sc, IFBF_FLUSHDYN); 1771 1772 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1773 } 1774 1775 /* 1776 * bridge_enqueue: 1777 * 1778 * Enqueue a packet on a bridge member interface. 1779 * 1780 */ 1781 static int 1782 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1783 { 1784 int len, err = 0; 1785 short mflags; 1786 struct mbuf *m0; 1787 1788 /* We may be sending a fragment so traverse the mbuf */ 1789 for (; m; m = m0) { 1790 m0 = m->m_nextpkt; 1791 m->m_nextpkt = NULL; 1792 len = m->m_pkthdr.len; 1793 mflags = m->m_flags; 1794 1795 /* 1796 * If underlying interface can not do VLAN tag insertion itself 1797 * then attach a packet tag that holds it. 1798 */ 1799 if ((m->m_flags & M_VLANTAG) && 1800 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1801 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1802 if (m == NULL) { 1803 if_printf(dst_ifp, 1804 "unable to prepend VLAN header\n"); 1805 dst_ifp->if_oerrors++; 1806 continue; 1807 } 1808 m->m_flags &= ~M_VLANTAG; 1809 } 1810 1811 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1812 m_freem(m0); 1813 sc->sc_ifp->if_oerrors++; 1814 break; 1815 } 1816 1817 sc->sc_ifp->if_opackets++; 1818 sc->sc_ifp->if_obytes += len; 1819 if (mflags & M_MCAST) 1820 sc->sc_ifp->if_omcasts++; 1821 } 1822 1823 return (err); 1824 } 1825 1826 /* 1827 * bridge_dummynet: 1828 * 1829 * Receive a queued packet from dummynet and pass it on to the output 1830 * interface. 1831 * 1832 * The mbuf has the Ethernet header already attached. 1833 */ 1834 static void 1835 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1836 { 1837 struct bridge_softc *sc; 1838 1839 sc = ifp->if_bridge; 1840 1841 /* 1842 * The packet didnt originate from a member interface. This should only 1843 * ever happen if a member interface is removed while packets are 1844 * queued for it. 1845 */ 1846 if (sc == NULL) { 1847 m_freem(m); 1848 return; 1849 } 1850 1851 if (PFIL_HOOKED(&V_inet_pfil_hook) 1852 #ifdef INET6 1853 || PFIL_HOOKED(&V_inet6_pfil_hook) 1854 #endif 1855 ) { 1856 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1857 return; 1858 if (m == NULL) 1859 return; 1860 } 1861 1862 bridge_enqueue(sc, ifp, m); 1863 } 1864 1865 /* 1866 * bridge_output: 1867 * 1868 * Send output from a bridge member interface. This 1869 * performs the bridging function for locally originated 1870 * packets. 1871 * 1872 * The mbuf has the Ethernet header already attached. We must 1873 * enqueue or free the mbuf before returning. 1874 */ 1875 static int 1876 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1877 struct rtentry *rt) 1878 { 1879 struct ether_header *eh; 1880 struct ifnet *dst_if; 1881 struct bridge_softc *sc; 1882 uint16_t vlan; 1883 1884 if (m->m_len < ETHER_HDR_LEN) { 1885 m = m_pullup(m, ETHER_HDR_LEN); 1886 if (m == NULL) 1887 return (0); 1888 } 1889 1890 eh = mtod(m, struct ether_header *); 1891 sc = ifp->if_bridge; 1892 vlan = VLANTAGOF(m); 1893 1894 BRIDGE_LOCK(sc); 1895 1896 /* 1897 * If bridge is down, but the original output interface is up, 1898 * go ahead and send out that interface. Otherwise, the packet 1899 * is dropped below. 1900 */ 1901 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1902 dst_if = ifp; 1903 goto sendunicast; 1904 } 1905 1906 /* 1907 * If the packet is a multicast, or we don't know a better way to 1908 * get there, send to all interfaces. 1909 */ 1910 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1911 dst_if = NULL; 1912 else 1913 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1914 if (dst_if == NULL) { 1915 struct bridge_iflist *bif; 1916 struct mbuf *mc; 1917 int error = 0, used = 0; 1918 1919 bridge_span(sc, m); 1920 1921 BRIDGE_LOCK2REF(sc, error); 1922 if (error) { 1923 m_freem(m); 1924 return (0); 1925 } 1926 1927 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1928 dst_if = bif->bif_ifp; 1929 1930 if (dst_if->if_type == IFT_GIF) 1931 continue; 1932 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1933 continue; 1934 1935 /* 1936 * If this is not the original output interface, 1937 * and the interface is participating in spanning 1938 * tree, make sure the port is in a state that 1939 * allows forwarding. 1940 */ 1941 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1942 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1943 continue; 1944 1945 if (LIST_NEXT(bif, bif_next) == NULL) { 1946 used = 1; 1947 mc = m; 1948 } else { 1949 mc = m_copypacket(m, M_DONTWAIT); 1950 if (mc == NULL) { 1951 sc->sc_ifp->if_oerrors++; 1952 continue; 1953 } 1954 } 1955 1956 bridge_enqueue(sc, dst_if, mc); 1957 } 1958 if (used == 0) 1959 m_freem(m); 1960 BRIDGE_UNREF(sc); 1961 return (0); 1962 } 1963 1964 sendunicast: 1965 /* 1966 * XXX Spanning tree consideration here? 1967 */ 1968 1969 bridge_span(sc, m); 1970 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1971 m_freem(m); 1972 BRIDGE_UNLOCK(sc); 1973 return (0); 1974 } 1975 1976 BRIDGE_UNLOCK(sc); 1977 bridge_enqueue(sc, dst_if, m); 1978 return (0); 1979 } 1980 1981 /* 1982 * bridge_transmit: 1983 * 1984 * Do output on a bridge. 1985 * 1986 */ 1987 static int 1988 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 1989 { 1990 struct bridge_softc *sc; 1991 int error = 0; 1992 1993 sc = ifp->if_softc; 1994 1995 ETHER_BPF_MTAP(ifp, m); 1996 1997 1998 BRIDGE_LOCK(sc); 1999 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2000 struct ether_header *eh; 2001 struct ifnet *dst_if; 2002 2003 eh = mtod(m, struct ether_header *); 2004 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 2005 BRIDGE_UNLOCK(sc); 2006 error = bridge_enqueue(sc, dst_if, m); 2007 } else 2008 bridge_broadcast(sc, ifp, m, 0); 2009 2010 return (error); 2011 } 2012 2013 /* 2014 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2015 */ 2016 static void 2017 bridge_qflush(struct ifnet *ifp __unused) 2018 { 2019 } 2020 2021 /* 2022 * bridge_forward: 2023 * 2024 * The forwarding function of the bridge. 2025 * 2026 * NOTE: Releases the lock on return. 2027 */ 2028 static void 2029 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2030 struct mbuf *m) 2031 { 2032 struct bridge_iflist *dbif; 2033 struct ifnet *src_if, *dst_if, *ifp; 2034 struct ether_header *eh; 2035 uint16_t vlan; 2036 uint8_t *dst; 2037 int error; 2038 2039 src_if = m->m_pkthdr.rcvif; 2040 ifp = sc->sc_ifp; 2041 2042 ifp->if_ipackets++; 2043 ifp->if_ibytes += m->m_pkthdr.len; 2044 vlan = VLANTAGOF(m); 2045 2046 if ((sbif->bif_flags & IFBIF_STP) && 2047 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2048 goto drop; 2049 2050 eh = mtod(m, struct ether_header *); 2051 dst = eh->ether_dhost; 2052 2053 /* If the interface is learning, record the address. */ 2054 if (sbif->bif_flags & IFBIF_LEARNING) { 2055 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2056 sbif, 0, IFBAF_DYNAMIC); 2057 /* 2058 * If the interface has addresses limits then deny any source 2059 * that is not in the cache. 2060 */ 2061 if (error && sbif->bif_addrmax) 2062 goto drop; 2063 } 2064 2065 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2066 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2067 goto drop; 2068 2069 /* 2070 * At this point, the port either doesn't participate 2071 * in spanning tree or it is in the forwarding state. 2072 */ 2073 2074 /* 2075 * If the packet is unicast, destined for someone on 2076 * "this" side of the bridge, drop it. 2077 */ 2078 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2079 dst_if = bridge_rtlookup(sc, dst, vlan); 2080 if (src_if == dst_if) 2081 goto drop; 2082 } else { 2083 /* 2084 * Check if its a reserved multicast address, any address 2085 * listed in 802.1D section 7.12.6 may not be forwarded by the 2086 * bridge. 2087 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2088 */ 2089 if (dst[0] == 0x01 && dst[1] == 0x80 && 2090 dst[2] == 0xc2 && dst[3] == 0x00 && 2091 dst[4] == 0x00 && dst[5] <= 0x0f) 2092 goto drop; 2093 2094 /* ...forward it to all interfaces. */ 2095 ifp->if_imcasts++; 2096 dst_if = NULL; 2097 } 2098 2099 /* 2100 * If we have a destination interface which is a member of our bridge, 2101 * OR this is a unicast packet, push it through the bpf(4) machinery. 2102 * For broadcast or multicast packets, don't bother because it will 2103 * be reinjected into ether_input. We do this before we pass the packets 2104 * through the pfil(9) framework, as it is possible that pfil(9) will 2105 * drop the packet, or possibly modify it, making it difficult to debug 2106 * firewall issues on the bridge. 2107 */ 2108 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2109 ETHER_BPF_MTAP(ifp, m); 2110 2111 /* run the packet filter */ 2112 if (PFIL_HOOKED(&V_inet_pfil_hook) 2113 #ifdef INET6 2114 || PFIL_HOOKED(&V_inet6_pfil_hook) 2115 #endif 2116 ) { 2117 BRIDGE_UNLOCK(sc); 2118 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2119 return; 2120 if (m == NULL) 2121 return; 2122 BRIDGE_LOCK(sc); 2123 } 2124 2125 if (dst_if == NULL) { 2126 bridge_broadcast(sc, src_if, m, 1); 2127 return; 2128 } 2129 2130 /* 2131 * At this point, we're dealing with a unicast frame 2132 * going to a different interface. 2133 */ 2134 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2135 goto drop; 2136 2137 dbif = bridge_lookup_member_if(sc, dst_if); 2138 if (dbif == NULL) 2139 /* Not a member of the bridge (anymore?) */ 2140 goto drop; 2141 2142 /* Private segments can not talk to each other */ 2143 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2144 goto drop; 2145 2146 if ((dbif->bif_flags & IFBIF_STP) && 2147 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2148 goto drop; 2149 2150 BRIDGE_UNLOCK(sc); 2151 2152 if (PFIL_HOOKED(&V_inet_pfil_hook) 2153 #ifdef INET6 2154 || PFIL_HOOKED(&V_inet6_pfil_hook) 2155 #endif 2156 ) { 2157 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2158 return; 2159 if (m == NULL) 2160 return; 2161 } 2162 2163 bridge_enqueue(sc, dst_if, m); 2164 return; 2165 2166 drop: 2167 BRIDGE_UNLOCK(sc); 2168 m_freem(m); 2169 } 2170 2171 /* 2172 * bridge_input: 2173 * 2174 * Receive input from a member interface. Queue the packet for 2175 * bridging if it is not for us. 2176 */ 2177 static struct mbuf * 2178 bridge_input(struct ifnet *ifp, struct mbuf *m) 2179 { 2180 struct bridge_softc *sc = ifp->if_bridge; 2181 struct bridge_iflist *bif, *bif2; 2182 struct ifnet *bifp; 2183 struct ether_header *eh; 2184 struct mbuf *mc, *mc2; 2185 uint16_t vlan; 2186 int error; 2187 2188 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2189 return (m); 2190 2191 bifp = sc->sc_ifp; 2192 vlan = VLANTAGOF(m); 2193 2194 /* 2195 * Implement support for bridge monitoring. If this flag has been 2196 * set on this interface, discard the packet once we push it through 2197 * the bpf(4) machinery, but before we do, increment the byte and 2198 * packet counters associated with this interface. 2199 */ 2200 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2201 m->m_pkthdr.rcvif = bifp; 2202 ETHER_BPF_MTAP(bifp, m); 2203 bifp->if_ipackets++; 2204 bifp->if_ibytes += m->m_pkthdr.len; 2205 m_freem(m); 2206 return (NULL); 2207 } 2208 BRIDGE_LOCK(sc); 2209 bif = bridge_lookup_member_if(sc, ifp); 2210 if (bif == NULL) { 2211 BRIDGE_UNLOCK(sc); 2212 return (m); 2213 } 2214 2215 eh = mtod(m, struct ether_header *); 2216 2217 bridge_span(sc, m); 2218 2219 if (m->m_flags & (M_BCAST|M_MCAST)) { 2220 /* Tap off 802.1D packets; they do not get forwarded. */ 2221 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2222 ETHER_ADDR_LEN) == 0) { 2223 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2224 BRIDGE_UNLOCK(sc); 2225 return (NULL); 2226 } 2227 2228 if ((bif->bif_flags & IFBIF_STP) && 2229 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2230 BRIDGE_UNLOCK(sc); 2231 return (m); 2232 } 2233 2234 /* 2235 * Make a deep copy of the packet and enqueue the copy 2236 * for bridge processing; return the original packet for 2237 * local processing. 2238 */ 2239 mc = m_dup(m, M_DONTWAIT); 2240 if (mc == NULL) { 2241 BRIDGE_UNLOCK(sc); 2242 return (m); 2243 } 2244 2245 /* Perform the bridge forwarding function with the copy. */ 2246 bridge_forward(sc, bif, mc); 2247 2248 /* 2249 * Reinject the mbuf as arriving on the bridge so we have a 2250 * chance at claiming multicast packets. We can not loop back 2251 * here from ether_input as a bridge is never a member of a 2252 * bridge. 2253 */ 2254 KASSERT(bifp->if_bridge == NULL, 2255 ("loop created in bridge_input")); 2256 mc2 = m_dup(m, M_DONTWAIT); 2257 if (mc2 != NULL) { 2258 /* Keep the layer3 header aligned */ 2259 int i = min(mc2->m_pkthdr.len, max_protohdr); 2260 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2261 } 2262 if (mc2 != NULL) { 2263 mc2->m_pkthdr.rcvif = bifp; 2264 (*bifp->if_input)(bifp, mc2); 2265 } 2266 2267 /* Return the original packet for local processing. */ 2268 return (m); 2269 } 2270 2271 if ((bif->bif_flags & IFBIF_STP) && 2272 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2273 BRIDGE_UNLOCK(sc); 2274 return (m); 2275 } 2276 2277 #if (defined(INET) || defined(INET6)) 2278 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2279 || ((iface)->if_carp \ 2280 && (*carp_forus_p)((iface), eh->ether_dhost)) 2281 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2282 || ((iface)->if_carp \ 2283 && (*carp_forus_p)((iface), eh->ether_shost)) 2284 #else 2285 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2286 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2287 #endif 2288 2289 #ifdef INET6 2290 # define OR_PFIL_HOOKED_INET6 \ 2291 || PFIL_HOOKED(&V_inet6_pfil_hook) 2292 #else 2293 # define OR_PFIL_HOOKED_INET6 2294 #endif 2295 2296 #define GRAB_OUR_PACKETS(iface) \ 2297 if ((iface)->if_type == IFT_GIF) \ 2298 continue; \ 2299 /* It is destined for us. */ \ 2300 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2301 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2302 ) { \ 2303 if ((iface)->if_type == IFT_BRIDGE) { \ 2304 ETHER_BPF_MTAP(iface, m); \ 2305 iface->if_ipackets++; \ 2306 iface->if_ibytes += m->m_pkthdr.len; \ 2307 /* Filter on the physical interface. */ \ 2308 if (pfil_local_phys && \ 2309 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2310 OR_PFIL_HOOKED_INET6)) { \ 2311 if (bridge_pfil(&m, NULL, ifp, \ 2312 PFIL_IN) != 0 || m == NULL) { \ 2313 BRIDGE_UNLOCK(sc); \ 2314 return (NULL); \ 2315 } \ 2316 } \ 2317 } \ 2318 if (bif->bif_flags & IFBIF_LEARNING) { \ 2319 error = bridge_rtupdate(sc, eh->ether_shost, \ 2320 vlan, bif, 0, IFBAF_DYNAMIC); \ 2321 if (error && bif->bif_addrmax) { \ 2322 BRIDGE_UNLOCK(sc); \ 2323 m_freem(m); \ 2324 return (NULL); \ 2325 } \ 2326 } \ 2327 m->m_pkthdr.rcvif = iface; \ 2328 BRIDGE_UNLOCK(sc); \ 2329 return (m); \ 2330 } \ 2331 \ 2332 /* We just received a packet that we sent out. */ \ 2333 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2334 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2335 ) { \ 2336 BRIDGE_UNLOCK(sc); \ 2337 m_freem(m); \ 2338 return (NULL); \ 2339 } 2340 2341 /* 2342 * Unicast. Make sure it's not for the bridge. 2343 */ 2344 do { GRAB_OUR_PACKETS(bifp) } while (0); 2345 2346 /* 2347 * Give a chance for ifp at first priority. This will help when the 2348 * packet comes through the interface like VLAN's with the same MACs 2349 * on several interfaces from the same bridge. This also will save 2350 * some CPU cycles in case the destination interface and the input 2351 * interface (eq ifp) are the same. 2352 */ 2353 do { GRAB_OUR_PACKETS(ifp) } while (0); 2354 2355 /* Now check the all bridge members. */ 2356 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2357 GRAB_OUR_PACKETS(bif2->bif_ifp) 2358 } 2359 2360 #undef OR_CARP_CHECK_WE_ARE_DST 2361 #undef OR_CARP_CHECK_WE_ARE_SRC 2362 #undef OR_PFIL_HOOKED_INET6 2363 #undef GRAB_OUR_PACKETS 2364 2365 /* Perform the bridge forwarding function. */ 2366 bridge_forward(sc, bif, m); 2367 2368 return (NULL); 2369 } 2370 2371 /* 2372 * bridge_broadcast: 2373 * 2374 * Send a frame to all interfaces that are members of 2375 * the bridge, except for the one on which the packet 2376 * arrived. 2377 * 2378 * NOTE: Releases the lock on return. 2379 */ 2380 static void 2381 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2382 struct mbuf *m, int runfilt) 2383 { 2384 struct bridge_iflist *dbif, *sbif; 2385 struct mbuf *mc; 2386 struct ifnet *dst_if; 2387 int error = 0, used = 0, i; 2388 2389 sbif = bridge_lookup_member_if(sc, src_if); 2390 2391 BRIDGE_LOCK2REF(sc, error); 2392 if (error) { 2393 m_freem(m); 2394 return; 2395 } 2396 2397 /* Filter on the bridge interface before broadcasting */ 2398 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2399 #ifdef INET6 2400 || PFIL_HOOKED(&V_inet6_pfil_hook) 2401 #endif 2402 )) { 2403 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2404 goto out; 2405 if (m == NULL) 2406 goto out; 2407 } 2408 2409 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2410 dst_if = dbif->bif_ifp; 2411 if (dst_if == src_if) 2412 continue; 2413 2414 /* Private segments can not talk to each other */ 2415 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2416 continue; 2417 2418 if ((dbif->bif_flags & IFBIF_STP) && 2419 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2420 continue; 2421 2422 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2423 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2424 continue; 2425 2426 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2427 continue; 2428 2429 if (LIST_NEXT(dbif, bif_next) == NULL) { 2430 mc = m; 2431 used = 1; 2432 } else { 2433 mc = m_dup(m, M_DONTWAIT); 2434 if (mc == NULL) { 2435 sc->sc_ifp->if_oerrors++; 2436 continue; 2437 } 2438 } 2439 2440 /* 2441 * Filter on the output interface. Pass a NULL bridge interface 2442 * pointer so we do not redundantly filter on the bridge for 2443 * each interface we broadcast on. 2444 */ 2445 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2446 #ifdef INET6 2447 || PFIL_HOOKED(&V_inet6_pfil_hook) 2448 #endif 2449 )) { 2450 if (used == 0) { 2451 /* Keep the layer3 header aligned */ 2452 i = min(mc->m_pkthdr.len, max_protohdr); 2453 mc = m_copyup(mc, i, ETHER_ALIGN); 2454 if (mc == NULL) { 2455 sc->sc_ifp->if_oerrors++; 2456 continue; 2457 } 2458 } 2459 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2460 continue; 2461 if (mc == NULL) 2462 continue; 2463 } 2464 2465 bridge_enqueue(sc, dst_if, mc); 2466 } 2467 if (used == 0) 2468 m_freem(m); 2469 2470 out: 2471 BRIDGE_UNREF(sc); 2472 } 2473 2474 /* 2475 * bridge_span: 2476 * 2477 * Duplicate a packet out one or more interfaces that are in span mode, 2478 * the original mbuf is unmodified. 2479 */ 2480 static void 2481 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2482 { 2483 struct bridge_iflist *bif; 2484 struct ifnet *dst_if; 2485 struct mbuf *mc; 2486 2487 if (LIST_EMPTY(&sc->sc_spanlist)) 2488 return; 2489 2490 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2491 dst_if = bif->bif_ifp; 2492 2493 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2494 continue; 2495 2496 mc = m_copypacket(m, M_DONTWAIT); 2497 if (mc == NULL) { 2498 sc->sc_ifp->if_oerrors++; 2499 continue; 2500 } 2501 2502 bridge_enqueue(sc, dst_if, mc); 2503 } 2504 } 2505 2506 /* 2507 * bridge_rtupdate: 2508 * 2509 * Add a bridge routing entry. 2510 */ 2511 static int 2512 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2513 struct bridge_iflist *bif, int setflags, uint8_t flags) 2514 { 2515 struct bridge_rtnode *brt; 2516 int error; 2517 2518 BRIDGE_LOCK_ASSERT(sc); 2519 2520 /* Check the source address is valid and not multicast. */ 2521 if (ETHER_IS_MULTICAST(dst) || 2522 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2523 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2524 return (EINVAL); 2525 2526 /* 802.1p frames map to vlan 1 */ 2527 if (vlan == 0) 2528 vlan = 1; 2529 2530 /* 2531 * A route for this destination might already exist. If so, 2532 * update it, otherwise create a new one. 2533 */ 2534 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2535 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2536 sc->sc_brtexceeded++; 2537 return (ENOSPC); 2538 } 2539 /* Check per interface address limits (if enabled) */ 2540 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2541 bif->bif_addrexceeded++; 2542 return (ENOSPC); 2543 } 2544 2545 /* 2546 * Allocate a new bridge forwarding node, and 2547 * initialize the expiration time and Ethernet 2548 * address. 2549 */ 2550 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2551 if (brt == NULL) 2552 return (ENOMEM); 2553 2554 if (bif->bif_flags & IFBIF_STICKY) 2555 brt->brt_flags = IFBAF_STICKY; 2556 else 2557 brt->brt_flags = IFBAF_DYNAMIC; 2558 2559 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2560 brt->brt_vlan = vlan; 2561 2562 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2563 uma_zfree(bridge_rtnode_zone, brt); 2564 return (error); 2565 } 2566 brt->brt_dst = bif; 2567 bif->bif_addrcnt++; 2568 } 2569 2570 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2571 brt->brt_dst != bif) { 2572 brt->brt_dst->bif_addrcnt--; 2573 brt->brt_dst = bif; 2574 brt->brt_dst->bif_addrcnt++; 2575 } 2576 2577 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2578 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2579 if (setflags) 2580 brt->brt_flags = flags; 2581 2582 return (0); 2583 } 2584 2585 /* 2586 * bridge_rtlookup: 2587 * 2588 * Lookup the destination interface for an address. 2589 */ 2590 static struct ifnet * 2591 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2592 { 2593 struct bridge_rtnode *brt; 2594 2595 BRIDGE_LOCK_ASSERT(sc); 2596 2597 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2598 return (NULL); 2599 2600 return (brt->brt_ifp); 2601 } 2602 2603 /* 2604 * bridge_rttrim: 2605 * 2606 * Trim the routine table so that we have a number 2607 * of routing entries less than or equal to the 2608 * maximum number. 2609 */ 2610 static void 2611 bridge_rttrim(struct bridge_softc *sc) 2612 { 2613 struct bridge_rtnode *brt, *nbrt; 2614 2615 BRIDGE_LOCK_ASSERT(sc); 2616 2617 /* Make sure we actually need to do this. */ 2618 if (sc->sc_brtcnt <= sc->sc_brtmax) 2619 return; 2620 2621 /* Force an aging cycle; this might trim enough addresses. */ 2622 bridge_rtage(sc); 2623 if (sc->sc_brtcnt <= sc->sc_brtmax) 2624 return; 2625 2626 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2627 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2628 bridge_rtnode_destroy(sc, brt); 2629 if (sc->sc_brtcnt <= sc->sc_brtmax) 2630 return; 2631 } 2632 } 2633 } 2634 2635 /* 2636 * bridge_timer: 2637 * 2638 * Aging timer for the bridge. 2639 */ 2640 static void 2641 bridge_timer(void *arg) 2642 { 2643 struct bridge_softc *sc = arg; 2644 2645 BRIDGE_LOCK_ASSERT(sc); 2646 2647 bridge_rtage(sc); 2648 2649 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2650 callout_reset(&sc->sc_brcallout, 2651 bridge_rtable_prune_period * hz, bridge_timer, sc); 2652 } 2653 2654 /* 2655 * bridge_rtage: 2656 * 2657 * Perform an aging cycle. 2658 */ 2659 static void 2660 bridge_rtage(struct bridge_softc *sc) 2661 { 2662 struct bridge_rtnode *brt, *nbrt; 2663 2664 BRIDGE_LOCK_ASSERT(sc); 2665 2666 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2667 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2668 if (time_uptime >= brt->brt_expire) 2669 bridge_rtnode_destroy(sc, brt); 2670 } 2671 } 2672 } 2673 2674 /* 2675 * bridge_rtflush: 2676 * 2677 * Remove all dynamic addresses from the bridge. 2678 */ 2679 static void 2680 bridge_rtflush(struct bridge_softc *sc, int full) 2681 { 2682 struct bridge_rtnode *brt, *nbrt; 2683 2684 BRIDGE_LOCK_ASSERT(sc); 2685 2686 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2687 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2688 bridge_rtnode_destroy(sc, brt); 2689 } 2690 } 2691 2692 /* 2693 * bridge_rtdaddr: 2694 * 2695 * Remove an address from the table. 2696 */ 2697 static int 2698 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2699 { 2700 struct bridge_rtnode *brt; 2701 int found = 0; 2702 2703 BRIDGE_LOCK_ASSERT(sc); 2704 2705 /* 2706 * If vlan is zero then we want to delete for all vlans so the lookup 2707 * may return more than one. 2708 */ 2709 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2710 bridge_rtnode_destroy(sc, brt); 2711 found = 1; 2712 } 2713 2714 return (found ? 0 : ENOENT); 2715 } 2716 2717 /* 2718 * bridge_rtdelete: 2719 * 2720 * Delete routes to a speicifc member interface. 2721 */ 2722 static void 2723 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2724 { 2725 struct bridge_rtnode *brt, *nbrt; 2726 2727 BRIDGE_LOCK_ASSERT(sc); 2728 2729 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2730 if (brt->brt_ifp == ifp && (full || 2731 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2732 bridge_rtnode_destroy(sc, brt); 2733 } 2734 } 2735 2736 /* 2737 * bridge_rtable_init: 2738 * 2739 * Initialize the route table for this bridge. 2740 */ 2741 static void 2742 bridge_rtable_init(struct bridge_softc *sc) 2743 { 2744 int i; 2745 2746 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2747 M_DEVBUF, M_WAITOK); 2748 2749 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2750 LIST_INIT(&sc->sc_rthash[i]); 2751 2752 sc->sc_rthash_key = arc4random(); 2753 LIST_INIT(&sc->sc_rtlist); 2754 } 2755 2756 /* 2757 * bridge_rtable_fini: 2758 * 2759 * Deconstruct the route table for this bridge. 2760 */ 2761 static void 2762 bridge_rtable_fini(struct bridge_softc *sc) 2763 { 2764 2765 KASSERT(sc->sc_brtcnt == 0, 2766 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2767 free(sc->sc_rthash, M_DEVBUF); 2768 } 2769 2770 /* 2771 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2772 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2773 */ 2774 #define mix(a, b, c) \ 2775 do { \ 2776 a -= b; a -= c; a ^= (c >> 13); \ 2777 b -= c; b -= a; b ^= (a << 8); \ 2778 c -= a; c -= b; c ^= (b >> 13); \ 2779 a -= b; a -= c; a ^= (c >> 12); \ 2780 b -= c; b -= a; b ^= (a << 16); \ 2781 c -= a; c -= b; c ^= (b >> 5); \ 2782 a -= b; a -= c; a ^= (c >> 3); \ 2783 b -= c; b -= a; b ^= (a << 10); \ 2784 c -= a; c -= b; c ^= (b >> 15); \ 2785 } while (/*CONSTCOND*/0) 2786 2787 static __inline uint32_t 2788 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2789 { 2790 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2791 2792 b += addr[5] << 8; 2793 b += addr[4]; 2794 a += addr[3] << 24; 2795 a += addr[2] << 16; 2796 a += addr[1] << 8; 2797 a += addr[0]; 2798 2799 mix(a, b, c); 2800 2801 return (c & BRIDGE_RTHASH_MASK); 2802 } 2803 2804 #undef mix 2805 2806 static int 2807 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2808 { 2809 int i, d; 2810 2811 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2812 d = ((int)a[i]) - ((int)b[i]); 2813 } 2814 2815 return (d); 2816 } 2817 2818 /* 2819 * bridge_rtnode_lookup: 2820 * 2821 * Look up a bridge route node for the specified destination. Compare the 2822 * vlan id or if zero then just return the first match. 2823 */ 2824 static struct bridge_rtnode * 2825 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2826 { 2827 struct bridge_rtnode *brt; 2828 uint32_t hash; 2829 int dir; 2830 2831 BRIDGE_LOCK_ASSERT(sc); 2832 2833 hash = bridge_rthash(sc, addr); 2834 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2835 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2836 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2837 return (brt); 2838 if (dir > 0) 2839 return (NULL); 2840 } 2841 2842 return (NULL); 2843 } 2844 2845 /* 2846 * bridge_rtnode_insert: 2847 * 2848 * Insert the specified bridge node into the route table. We 2849 * assume the entry is not already in the table. 2850 */ 2851 static int 2852 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2853 { 2854 struct bridge_rtnode *lbrt; 2855 uint32_t hash; 2856 int dir; 2857 2858 BRIDGE_LOCK_ASSERT(sc); 2859 2860 hash = bridge_rthash(sc, brt->brt_addr); 2861 2862 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2863 if (lbrt == NULL) { 2864 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2865 goto out; 2866 } 2867 2868 do { 2869 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2870 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2871 return (EEXIST); 2872 if (dir > 0) { 2873 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2874 goto out; 2875 } 2876 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2877 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2878 goto out; 2879 } 2880 lbrt = LIST_NEXT(lbrt, brt_hash); 2881 } while (lbrt != NULL); 2882 2883 #ifdef DIAGNOSTIC 2884 panic("bridge_rtnode_insert: impossible"); 2885 #endif 2886 2887 out: 2888 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2889 sc->sc_brtcnt++; 2890 2891 return (0); 2892 } 2893 2894 /* 2895 * bridge_rtnode_destroy: 2896 * 2897 * Destroy a bridge rtnode. 2898 */ 2899 static void 2900 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2901 { 2902 BRIDGE_LOCK_ASSERT(sc); 2903 2904 LIST_REMOVE(brt, brt_hash); 2905 2906 LIST_REMOVE(brt, brt_list); 2907 sc->sc_brtcnt--; 2908 brt->brt_dst->bif_addrcnt--; 2909 uma_zfree(bridge_rtnode_zone, brt); 2910 } 2911 2912 /* 2913 * bridge_rtable_expire: 2914 * 2915 * Set the expiry time for all routes on an interface. 2916 */ 2917 static void 2918 bridge_rtable_expire(struct ifnet *ifp, int age) 2919 { 2920 struct bridge_softc *sc = ifp->if_bridge; 2921 struct bridge_rtnode *brt; 2922 2923 BRIDGE_LOCK(sc); 2924 2925 /* 2926 * If the age is zero then flush, otherwise set all the expiry times to 2927 * age for the interface 2928 */ 2929 if (age == 0) 2930 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2931 else { 2932 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2933 /* Cap the expiry time to 'age' */ 2934 if (brt->brt_ifp == ifp && 2935 brt->brt_expire > time_uptime + age && 2936 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2937 brt->brt_expire = time_uptime + age; 2938 } 2939 } 2940 BRIDGE_UNLOCK(sc); 2941 } 2942 2943 /* 2944 * bridge_state_change: 2945 * 2946 * Callback from the bridgestp code when a port changes states. 2947 */ 2948 static void 2949 bridge_state_change(struct ifnet *ifp, int state) 2950 { 2951 struct bridge_softc *sc = ifp->if_bridge; 2952 static const char *stpstates[] = { 2953 "disabled", 2954 "listening", 2955 "learning", 2956 "forwarding", 2957 "blocking", 2958 "discarding" 2959 }; 2960 2961 if (log_stp) 2962 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2963 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2964 } 2965 2966 /* 2967 * Send bridge packets through pfil if they are one of the types pfil can deal 2968 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2969 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2970 * that interface. 2971 */ 2972 static int 2973 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2974 { 2975 int snap, error, i, hlen; 2976 struct ether_header *eh1, eh2; 2977 struct ip *ip; 2978 struct llc llc1; 2979 u_int16_t ether_type; 2980 2981 snap = 0; 2982 error = -1; /* Default error if not error == 0 */ 2983 2984 #if 0 2985 /* we may return with the IP fields swapped, ensure its not shared */ 2986 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2987 #endif 2988 2989 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2990 return (0); /* filtering is disabled */ 2991 2992 i = min((*mp)->m_pkthdr.len, max_protohdr); 2993 if ((*mp)->m_len < i) { 2994 *mp = m_pullup(*mp, i); 2995 if (*mp == NULL) { 2996 printf("%s: m_pullup failed\n", __func__); 2997 return (-1); 2998 } 2999 } 3000 3001 eh1 = mtod(*mp, struct ether_header *); 3002 ether_type = ntohs(eh1->ether_type); 3003 3004 /* 3005 * Check for SNAP/LLC. 3006 */ 3007 if (ether_type < ETHERMTU) { 3008 struct llc *llc2 = (struct llc *)(eh1 + 1); 3009 3010 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3011 llc2->llc_dsap == LLC_SNAP_LSAP && 3012 llc2->llc_ssap == LLC_SNAP_LSAP && 3013 llc2->llc_control == LLC_UI) { 3014 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3015 snap = 1; 3016 } 3017 } 3018 3019 /* 3020 * If we're trying to filter bridge traffic, don't look at anything 3021 * other than IP and ARP traffic. If the filter doesn't understand 3022 * IPv6, don't allow IPv6 through the bridge either. This is lame 3023 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3024 * but of course we don't have an AppleTalk filter to begin with. 3025 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3026 * ARP traffic.) 3027 */ 3028 switch (ether_type) { 3029 case ETHERTYPE_ARP: 3030 case ETHERTYPE_REVARP: 3031 if (pfil_ipfw_arp == 0) 3032 return (0); /* Automatically pass */ 3033 break; 3034 3035 case ETHERTYPE_IP: 3036 #ifdef INET6 3037 case ETHERTYPE_IPV6: 3038 #endif /* INET6 */ 3039 break; 3040 default: 3041 /* 3042 * Check to see if the user wants to pass non-ip 3043 * packets, these will not be checked by pfil(9) and 3044 * passed unconditionally so the default is to drop. 3045 */ 3046 if (pfil_onlyip) 3047 goto bad; 3048 } 3049 3050 /* Run the packet through pfil before stripping link headers */ 3051 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3052 dir == PFIL_OUT && ifp != NULL) { 3053 3054 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3055 3056 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3057 return (error); 3058 } 3059 3060 /* Strip off the Ethernet header and keep a copy. */ 3061 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3062 m_adj(*mp, ETHER_HDR_LEN); 3063 3064 /* Strip off snap header, if present */ 3065 if (snap) { 3066 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3067 m_adj(*mp, sizeof(struct llc)); 3068 } 3069 3070 /* 3071 * Check the IP header for alignment and errors 3072 */ 3073 if (dir == PFIL_IN) { 3074 switch (ether_type) { 3075 case ETHERTYPE_IP: 3076 error = bridge_ip_checkbasic(mp); 3077 break; 3078 #ifdef INET6 3079 case ETHERTYPE_IPV6: 3080 error = bridge_ip6_checkbasic(mp); 3081 break; 3082 #endif /* INET6 */ 3083 default: 3084 error = 0; 3085 } 3086 if (error) 3087 goto bad; 3088 } 3089 3090 error = 0; 3091 3092 /* 3093 * Run the packet through pfil 3094 */ 3095 switch (ether_type) { 3096 case ETHERTYPE_IP: 3097 /* 3098 * Run pfil on the member interface and the bridge, both can 3099 * be skipped by clearing pfil_member or pfil_bridge. 3100 * 3101 * Keep the order: 3102 * in_if -> bridge_if -> out_if 3103 */ 3104 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3105 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3106 dir, NULL); 3107 3108 if (*mp == NULL || error != 0) /* filter may consume */ 3109 break; 3110 3111 if (pfil_member && ifp != NULL) 3112 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3113 dir, NULL); 3114 3115 if (*mp == NULL || error != 0) /* filter may consume */ 3116 break; 3117 3118 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3119 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3120 dir, NULL); 3121 3122 if (*mp == NULL || error != 0) /* filter may consume */ 3123 break; 3124 3125 /* check if we need to fragment the packet */ 3126 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3127 i = (*mp)->m_pkthdr.len; 3128 if (i > ifp->if_mtu) { 3129 error = bridge_fragment(ifp, *mp, &eh2, snap, 3130 &llc1); 3131 return (error); 3132 } 3133 } 3134 3135 /* Recalculate the ip checksum. */ 3136 ip = mtod(*mp, struct ip *); 3137 hlen = ip->ip_hl << 2; 3138 if (hlen < sizeof(struct ip)) 3139 goto bad; 3140 if (hlen > (*mp)->m_len) { 3141 if ((*mp = m_pullup(*mp, hlen)) == 0) 3142 goto bad; 3143 ip = mtod(*mp, struct ip *); 3144 if (ip == NULL) 3145 goto bad; 3146 } 3147 ip->ip_sum = 0; 3148 if (hlen == sizeof(struct ip)) 3149 ip->ip_sum = in_cksum_hdr(ip); 3150 else 3151 ip->ip_sum = in_cksum(*mp, hlen); 3152 3153 break; 3154 #ifdef INET6 3155 case ETHERTYPE_IPV6: 3156 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3157 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3158 dir, NULL); 3159 3160 if (*mp == NULL || error != 0) /* filter may consume */ 3161 break; 3162 3163 if (pfil_member && ifp != NULL) 3164 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3165 dir, NULL); 3166 3167 if (*mp == NULL || error != 0) /* filter may consume */ 3168 break; 3169 3170 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3171 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3172 dir, NULL); 3173 break; 3174 #endif 3175 default: 3176 error = 0; 3177 break; 3178 } 3179 3180 if (*mp == NULL) 3181 return (error); 3182 if (error != 0) 3183 goto bad; 3184 3185 error = -1; 3186 3187 /* 3188 * Finally, put everything back the way it was and return 3189 */ 3190 if (snap) { 3191 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3192 if (*mp == NULL) 3193 return (error); 3194 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3195 } 3196 3197 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3198 if (*mp == NULL) 3199 return (error); 3200 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3201 3202 return (0); 3203 3204 bad: 3205 m_freem(*mp); 3206 *mp = NULL; 3207 return (error); 3208 } 3209 3210 /* 3211 * Perform basic checks on header size since 3212 * pfil assumes ip_input has already processed 3213 * it for it. Cut-and-pasted from ip_input.c. 3214 * Given how simple the IPv6 version is, 3215 * does the IPv4 version really need to be 3216 * this complicated? 3217 * 3218 * XXX Should we update ipstat here, or not? 3219 * XXX Right now we update ipstat but not 3220 * XXX csum_counter. 3221 */ 3222 static int 3223 bridge_ip_checkbasic(struct mbuf **mp) 3224 { 3225 struct mbuf *m = *mp; 3226 struct ip *ip; 3227 int len, hlen; 3228 u_short sum; 3229 3230 if (*mp == NULL) 3231 return (-1); 3232 3233 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3234 if ((m = m_copyup(m, sizeof(struct ip), 3235 (max_linkhdr + 3) & ~3)) == NULL) { 3236 /* XXXJRT new stat, please */ 3237 KMOD_IPSTAT_INC(ips_toosmall); 3238 goto bad; 3239 } 3240 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3241 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3242 KMOD_IPSTAT_INC(ips_toosmall); 3243 goto bad; 3244 } 3245 } 3246 ip = mtod(m, struct ip *); 3247 if (ip == NULL) goto bad; 3248 3249 if (ip->ip_v != IPVERSION) { 3250 KMOD_IPSTAT_INC(ips_badvers); 3251 goto bad; 3252 } 3253 hlen = ip->ip_hl << 2; 3254 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3255 KMOD_IPSTAT_INC(ips_badhlen); 3256 goto bad; 3257 } 3258 if (hlen > m->m_len) { 3259 if ((m = m_pullup(m, hlen)) == 0) { 3260 KMOD_IPSTAT_INC(ips_badhlen); 3261 goto bad; 3262 } 3263 ip = mtod(m, struct ip *); 3264 if (ip == NULL) goto bad; 3265 } 3266 3267 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3268 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3269 } else { 3270 if (hlen == sizeof(struct ip)) { 3271 sum = in_cksum_hdr(ip); 3272 } else { 3273 sum = in_cksum(m, hlen); 3274 } 3275 } 3276 if (sum) { 3277 KMOD_IPSTAT_INC(ips_badsum); 3278 goto bad; 3279 } 3280 3281 /* Retrieve the packet length. */ 3282 len = ntohs(ip->ip_len); 3283 3284 /* 3285 * Check for additional length bogosity 3286 */ 3287 if (len < hlen) { 3288 KMOD_IPSTAT_INC(ips_badlen); 3289 goto bad; 3290 } 3291 3292 /* 3293 * Check that the amount of data in the buffers 3294 * is as at least much as the IP header would have us expect. 3295 * Drop packet if shorter than we expect. 3296 */ 3297 if (m->m_pkthdr.len < len) { 3298 KMOD_IPSTAT_INC(ips_tooshort); 3299 goto bad; 3300 } 3301 3302 /* Checks out, proceed */ 3303 *mp = m; 3304 return (0); 3305 3306 bad: 3307 *mp = m; 3308 return (-1); 3309 } 3310 3311 #ifdef INET6 3312 /* 3313 * Same as above, but for IPv6. 3314 * Cut-and-pasted from ip6_input.c. 3315 * XXX Should we update ip6stat, or not? 3316 */ 3317 static int 3318 bridge_ip6_checkbasic(struct mbuf **mp) 3319 { 3320 struct mbuf *m = *mp; 3321 struct ip6_hdr *ip6; 3322 3323 /* 3324 * If the IPv6 header is not aligned, slurp it up into a new 3325 * mbuf with space for link headers, in the event we forward 3326 * it. Otherwise, if it is aligned, make sure the entire base 3327 * IPv6 header is in the first mbuf of the chain. 3328 */ 3329 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3330 struct ifnet *inifp = m->m_pkthdr.rcvif; 3331 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3332 (max_linkhdr + 3) & ~3)) == NULL) { 3333 /* XXXJRT new stat, please */ 3334 V_ip6stat.ip6s_toosmall++; 3335 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3336 goto bad; 3337 } 3338 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3339 struct ifnet *inifp = m->m_pkthdr.rcvif; 3340 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3341 V_ip6stat.ip6s_toosmall++; 3342 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3343 goto bad; 3344 } 3345 } 3346 3347 ip6 = mtod(m, struct ip6_hdr *); 3348 3349 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3350 V_ip6stat.ip6s_badvers++; 3351 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3352 goto bad; 3353 } 3354 3355 /* Checks out, proceed */ 3356 *mp = m; 3357 return (0); 3358 3359 bad: 3360 *mp = m; 3361 return (-1); 3362 } 3363 #endif /* INET6 */ 3364 3365 /* 3366 * bridge_fragment: 3367 * 3368 * Return a fragmented mbuf chain. 3369 */ 3370 static int 3371 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3372 int snap, struct llc *llc) 3373 { 3374 struct mbuf *m0; 3375 struct ip *ip; 3376 int error = -1; 3377 3378 if (m->m_len < sizeof(struct ip) && 3379 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3380 goto out; 3381 ip = mtod(m, struct ip *); 3382 3383 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3384 CSUM_DELAY_IP); 3385 if (error) 3386 goto out; 3387 3388 /* walk the chain and re-add the Ethernet header */ 3389 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3390 if (error == 0) { 3391 if (snap) { 3392 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3393 if (m0 == NULL) { 3394 error = ENOBUFS; 3395 continue; 3396 } 3397 bcopy(llc, mtod(m0, caddr_t), 3398 sizeof(struct llc)); 3399 } 3400 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3401 if (m0 == NULL) { 3402 error = ENOBUFS; 3403 continue; 3404 } 3405 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3406 } else 3407 m_freem(m); 3408 } 3409 3410 if (error == 0) 3411 KMOD_IPSTAT_INC(ips_fragmented); 3412 3413 return (error); 3414 3415 out: 3416 if (m != NULL) 3417 m_freem(m); 3418 return (error); 3419 } 3420 3421 static void 3422 bridge_linkstate(struct ifnet *ifp) 3423 { 3424 struct bridge_softc *sc = ifp->if_bridge; 3425 struct bridge_iflist *bif; 3426 3427 BRIDGE_LOCK(sc); 3428 bif = bridge_lookup_member_if(sc, ifp); 3429 if (bif == NULL) { 3430 BRIDGE_UNLOCK(sc); 3431 return; 3432 } 3433 bridge_linkcheck(sc); 3434 BRIDGE_UNLOCK(sc); 3435 3436 bstp_linkstate(&bif->bif_stp); 3437 } 3438 3439 static void 3440 bridge_linkcheck(struct bridge_softc *sc) 3441 { 3442 struct bridge_iflist *bif; 3443 int new_link, hasls; 3444 3445 BRIDGE_LOCK_ASSERT(sc); 3446 new_link = LINK_STATE_DOWN; 3447 hasls = 0; 3448 /* Our link is considered up if at least one of our ports is active */ 3449 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3450 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3451 hasls++; 3452 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3453 new_link = LINK_STATE_UP; 3454 break; 3455 } 3456 } 3457 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3458 /* If no interfaces support link-state then we default to up */ 3459 new_link = LINK_STATE_UP; 3460 } 3461 if_link_state_change(sc->sc_ifp, new_link); 3462 } 3463