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.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 do { 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 break; 641 } 642 } 643 mtx_unlock(&bridge_list_mtx); 644 } while (retry == 1); 645 646 bstp_attach(&sc->sc_stp, &bridge_ops); 647 ether_ifattach(ifp, sc->sc_defaddr); 648 /* Now undo some of the damage... */ 649 ifp->if_baudrate = 0; 650 ifp->if_type = IFT_BRIDGE; 651 652 mtx_lock(&bridge_list_mtx); 653 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 654 mtx_unlock(&bridge_list_mtx); 655 656 return (0); 657 } 658 659 /* 660 * bridge_clone_destroy: 661 * 662 * Destroy a bridge instance. 663 */ 664 static void 665 bridge_clone_destroy(struct ifnet *ifp) 666 { 667 struct bridge_softc *sc = ifp->if_softc; 668 struct bridge_iflist *bif; 669 670 BRIDGE_LOCK(sc); 671 672 bridge_stop(ifp, 1); 673 ifp->if_flags &= ~IFF_UP; 674 675 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 676 bridge_delete_member(sc, bif, 0); 677 678 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 679 bridge_delete_span(sc, bif); 680 } 681 682 BRIDGE_UNLOCK(sc); 683 684 callout_drain(&sc->sc_brcallout); 685 686 mtx_lock(&bridge_list_mtx); 687 LIST_REMOVE(sc, sc_list); 688 mtx_unlock(&bridge_list_mtx); 689 690 bstp_detach(&sc->sc_stp); 691 ether_ifdetach(ifp); 692 if_free(ifp); 693 694 /* Tear down the routing table. */ 695 bridge_rtable_fini(sc); 696 697 BRIDGE_LOCK_DESTROY(sc); 698 free(sc, M_DEVBUF); 699 } 700 701 /* 702 * bridge_ioctl: 703 * 704 * Handle a control request from the operator. 705 */ 706 static int 707 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 708 { 709 struct bridge_softc *sc = ifp->if_softc; 710 struct ifreq *ifr = (struct ifreq *)data; 711 struct bridge_iflist *bif; 712 struct thread *td = curthread; 713 union { 714 struct ifbreq ifbreq; 715 struct ifbifconf ifbifconf; 716 struct ifbareq ifbareq; 717 struct ifbaconf ifbaconf; 718 struct ifbrparam ifbrparam; 719 struct ifbropreq ifbropreq; 720 } args; 721 struct ifdrv *ifd = (struct ifdrv *) data; 722 const struct bridge_control *bc; 723 int error = 0; 724 725 switch (cmd) { 726 727 case SIOCADDMULTI: 728 case SIOCDELMULTI: 729 break; 730 731 case SIOCGDRVSPEC: 732 case SIOCSDRVSPEC: 733 if (ifd->ifd_cmd >= bridge_control_table_size) { 734 error = EINVAL; 735 break; 736 } 737 bc = &bridge_control_table[ifd->ifd_cmd]; 738 739 if (cmd == SIOCGDRVSPEC && 740 (bc->bc_flags & BC_F_COPYOUT) == 0) { 741 error = EINVAL; 742 break; 743 } 744 else if (cmd == SIOCSDRVSPEC && 745 (bc->bc_flags & BC_F_COPYOUT) != 0) { 746 error = EINVAL; 747 break; 748 } 749 750 if (bc->bc_flags & BC_F_SUSER) { 751 error = priv_check(td, PRIV_NET_BRIDGE); 752 if (error) 753 break; 754 } 755 756 if (ifd->ifd_len != bc->bc_argsize || 757 ifd->ifd_len > sizeof(args)) { 758 error = EINVAL; 759 break; 760 } 761 762 bzero(&args, sizeof(args)); 763 if (bc->bc_flags & BC_F_COPYIN) { 764 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 765 if (error) 766 break; 767 } 768 769 BRIDGE_LOCK(sc); 770 error = (*bc->bc_func)(sc, &args); 771 BRIDGE_UNLOCK(sc); 772 if (error) 773 break; 774 775 if (bc->bc_flags & BC_F_COPYOUT) 776 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 777 778 break; 779 780 case SIOCSIFFLAGS: 781 if (!(ifp->if_flags & IFF_UP) && 782 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 783 /* 784 * If interface is marked down and it is running, 785 * then stop and disable it. 786 */ 787 BRIDGE_LOCK(sc); 788 bridge_stop(ifp, 1); 789 BRIDGE_UNLOCK(sc); 790 } else if ((ifp->if_flags & IFF_UP) && 791 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 792 /* 793 * If interface is marked up and it is stopped, then 794 * start it. 795 */ 796 (*ifp->if_init)(sc); 797 } 798 break; 799 800 case SIOCSIFMTU: 801 if (ifr->ifr_mtu < 576) { 802 error = EINVAL; 803 break; 804 } 805 if (LIST_EMPTY(&sc->sc_iflist)) { 806 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 807 break; 808 } 809 BRIDGE_LOCK(sc); 810 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 811 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 812 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 813 " != %d\n", sc->sc_ifp->if_xname, 814 bif->bif_ifp->if_mtu, 815 bif->bif_ifp->if_xname, ifr->ifr_mtu); 816 error = EINVAL; 817 break; 818 } 819 } 820 if (!error) 821 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 822 BRIDGE_UNLOCK(sc); 823 break; 824 default: 825 /* 826 * drop the lock as ether_ioctl() will call bridge_start() and 827 * cause the lock to be recursed. 828 */ 829 error = ether_ioctl(ifp, cmd, data); 830 break; 831 } 832 833 return (error); 834 } 835 836 /* 837 * bridge_mutecaps: 838 * 839 * Clear or restore unwanted capabilities on the member interface 840 */ 841 static void 842 bridge_mutecaps(struct bridge_softc *sc) 843 { 844 struct bridge_iflist *bif; 845 int enabled, mask; 846 847 /* Initial bitmask of capabilities to test */ 848 mask = BRIDGE_IFCAPS_MASK; 849 850 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 851 /* Every member must support it or its disabled */ 852 mask &= bif->bif_savedcaps; 853 } 854 855 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 856 enabled = bif->bif_ifp->if_capenable; 857 enabled &= ~BRIDGE_IFCAPS_STRIP; 858 /* strip off mask bits and enable them again if allowed */ 859 enabled &= ~BRIDGE_IFCAPS_MASK; 860 enabled |= mask; 861 bridge_set_ifcap(sc, bif, enabled); 862 } 863 864 } 865 866 static void 867 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 868 { 869 struct ifnet *ifp = bif->bif_ifp; 870 struct ifreq ifr; 871 int error; 872 873 bzero(&ifr, sizeof(ifr)); 874 ifr.ifr_reqcap = set; 875 876 if (ifp->if_capenable != set) { 877 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 878 if (error) 879 if_printf(sc->sc_ifp, 880 "error setting interface capabilities on %s\n", 881 ifp->if_xname); 882 } 883 } 884 885 /* 886 * bridge_lookup_member: 887 * 888 * Lookup a bridge member interface. 889 */ 890 static struct bridge_iflist * 891 bridge_lookup_member(struct bridge_softc *sc, const char *name) 892 { 893 struct bridge_iflist *bif; 894 struct ifnet *ifp; 895 896 BRIDGE_LOCK_ASSERT(sc); 897 898 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 899 ifp = bif->bif_ifp; 900 if (strcmp(ifp->if_xname, name) == 0) 901 return (bif); 902 } 903 904 return (NULL); 905 } 906 907 /* 908 * bridge_lookup_member_if: 909 * 910 * Lookup a bridge member interface by ifnet*. 911 */ 912 static struct bridge_iflist * 913 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 914 { 915 struct bridge_iflist *bif; 916 917 BRIDGE_LOCK_ASSERT(sc); 918 919 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 920 if (bif->bif_ifp == member_ifp) 921 return (bif); 922 } 923 924 return (NULL); 925 } 926 927 /* 928 * bridge_delete_member: 929 * 930 * Delete the specified member interface. 931 */ 932 static void 933 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 934 int gone) 935 { 936 struct ifnet *ifs = bif->bif_ifp; 937 struct ifnet *fif = NULL; 938 939 BRIDGE_LOCK_ASSERT(sc); 940 941 if (bif->bif_flags & IFBIF_STP) 942 bstp_disable(&bif->bif_stp); 943 944 ifs->if_bridge = NULL; 945 BRIDGE_XLOCK(sc); 946 LIST_REMOVE(bif, bif_next); 947 BRIDGE_XDROP(sc); 948 949 /* 950 * If removing the interface that gave the bridge its mac address, set 951 * the mac address of the bridge to the address of the next member, or 952 * to its default address if no members are left. 953 */ 954 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 955 if (LIST_EMPTY(&sc->sc_iflist)) { 956 bcopy(sc->sc_defaddr, 957 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 958 sc->sc_ifaddr = NULL; 959 } else { 960 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 961 bcopy(IF_LLADDR(fif), 962 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 963 sc->sc_ifaddr = fif; 964 } 965 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 966 } 967 968 bridge_linkcheck(sc); 969 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 970 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 971 KASSERT(bif->bif_addrcnt == 0, 972 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 973 974 BRIDGE_UNLOCK(sc); 975 if (!gone) { 976 switch (ifs->if_type) { 977 case IFT_ETHER: 978 case IFT_L2VLAN: 979 /* 980 * Take the interface out of promiscuous mode. 981 */ 982 (void) ifpromisc(ifs, 0); 983 break; 984 985 case IFT_GIF: 986 break; 987 988 default: 989 #ifdef DIAGNOSTIC 990 panic("bridge_delete_member: impossible"); 991 #endif 992 break; 993 } 994 /* reneable any interface capabilities */ 995 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 996 } 997 bstp_destroy(&bif->bif_stp); /* prepare to free */ 998 BRIDGE_LOCK(sc); 999 free(bif, M_DEVBUF); 1000 } 1001 1002 /* 1003 * bridge_delete_span: 1004 * 1005 * Delete the specified span interface. 1006 */ 1007 static void 1008 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1009 { 1010 BRIDGE_LOCK_ASSERT(sc); 1011 1012 KASSERT(bif->bif_ifp->if_bridge == NULL, 1013 ("%s: not a span interface", __func__)); 1014 1015 LIST_REMOVE(bif, bif_next); 1016 free(bif, M_DEVBUF); 1017 } 1018 1019 static int 1020 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1021 { 1022 struct ifbreq *req = arg; 1023 struct bridge_iflist *bif = NULL; 1024 struct ifnet *ifs; 1025 int error = 0; 1026 1027 ifs = ifunit(req->ifbr_ifsname); 1028 if (ifs == NULL) 1029 return (ENOENT); 1030 if (ifs->if_ioctl == NULL) /* must be supported */ 1031 return (EINVAL); 1032 1033 /* If it's in the span list, it can't be a member. */ 1034 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1035 if (ifs == bif->bif_ifp) 1036 return (EBUSY); 1037 1038 if (ifs->if_bridge == sc) 1039 return (EEXIST); 1040 1041 if (ifs->if_bridge != NULL) 1042 return (EBUSY); 1043 1044 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1045 if (bif == NULL) 1046 return (ENOMEM); 1047 1048 bif->bif_ifp = ifs; 1049 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1050 bif->bif_savedcaps = ifs->if_capenable; 1051 1052 switch (ifs->if_type) { 1053 case IFT_ETHER: 1054 case IFT_L2VLAN: 1055 case IFT_GIF: 1056 /* permitted interface types */ 1057 break; 1058 default: 1059 error = EINVAL; 1060 goto out; 1061 } 1062 1063 /* Allow the first Ethernet member to define the MTU */ 1064 if (LIST_EMPTY(&sc->sc_iflist)) 1065 sc->sc_ifp->if_mtu = ifs->if_mtu; 1066 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1067 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1068 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1069 error = EINVAL; 1070 goto out; 1071 } 1072 1073 /* 1074 * Assign the interface's MAC address to the bridge if it's the first 1075 * member and the MAC address of the bridge has not been changed from 1076 * the default randomly generated one. 1077 */ 1078 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1079 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1080 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1081 sc->sc_ifaddr = ifs; 1082 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1083 } 1084 1085 ifs->if_bridge = sc; 1086 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1087 /* 1088 * XXX: XLOCK HERE!?! 1089 * 1090 * NOTE: insert_***HEAD*** should be safe for the traversals. 1091 */ 1092 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1093 1094 /* Set interface capabilities to the intersection set of all members */ 1095 bridge_mutecaps(sc); 1096 bridge_linkcheck(sc); 1097 1098 /* Place the interface into promiscuous mode */ 1099 switch (ifs->if_type) { 1100 case IFT_ETHER: 1101 case IFT_L2VLAN: 1102 BRIDGE_UNLOCK(sc); 1103 error = ifpromisc(ifs, 1); 1104 BRIDGE_LOCK(sc); 1105 break; 1106 } 1107 if (error) 1108 bridge_delete_member(sc, bif, 0); 1109 out: 1110 if (error) { 1111 if (bif != NULL) 1112 free(bif, M_DEVBUF); 1113 } 1114 return (error); 1115 } 1116 1117 static int 1118 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1119 { 1120 struct ifbreq *req = arg; 1121 struct bridge_iflist *bif; 1122 1123 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1124 if (bif == NULL) 1125 return (ENOENT); 1126 1127 bridge_delete_member(sc, bif, 0); 1128 1129 return (0); 1130 } 1131 1132 static int 1133 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1134 { 1135 struct ifbreq *req = arg; 1136 struct bridge_iflist *bif; 1137 struct bstp_port *bp; 1138 1139 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1140 if (bif == NULL) 1141 return (ENOENT); 1142 1143 bp = &bif->bif_stp; 1144 req->ifbr_ifsflags = bif->bif_flags; 1145 req->ifbr_state = bp->bp_state; 1146 req->ifbr_priority = bp->bp_priority; 1147 req->ifbr_path_cost = bp->bp_path_cost; 1148 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1149 req->ifbr_proto = bp->bp_protover; 1150 req->ifbr_role = bp->bp_role; 1151 req->ifbr_stpflags = bp->bp_flags; 1152 req->ifbr_addrcnt = bif->bif_addrcnt; 1153 req->ifbr_addrmax = bif->bif_addrmax; 1154 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1155 1156 /* Copy STP state options as flags */ 1157 if (bp->bp_operedge) 1158 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1159 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1160 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1161 if (bp->bp_ptp_link) 1162 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1163 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1164 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1165 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1166 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1167 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1168 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1169 return (0); 1170 } 1171 1172 static int 1173 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbreq *req = arg; 1176 struct bridge_iflist *bif; 1177 struct bstp_port *bp; 1178 int error; 1179 1180 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1181 if (bif == NULL) 1182 return (ENOENT); 1183 bp = &bif->bif_stp; 1184 1185 if (req->ifbr_ifsflags & IFBIF_SPAN) 1186 /* SPAN is readonly */ 1187 return (EINVAL); 1188 1189 if (req->ifbr_ifsflags & IFBIF_STP) { 1190 if ((bif->bif_flags & IFBIF_STP) == 0) { 1191 error = bstp_enable(&bif->bif_stp); 1192 if (error) 1193 return (error); 1194 } 1195 } else { 1196 if ((bif->bif_flags & IFBIF_STP) != 0) 1197 bstp_disable(&bif->bif_stp); 1198 } 1199 1200 /* Pass on STP flags */ 1201 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1202 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1203 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1204 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1205 1206 /* Save the bits relating to the bridge */ 1207 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1208 1209 return (0); 1210 } 1211 1212 static int 1213 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1214 { 1215 struct ifbrparam *param = arg; 1216 1217 sc->sc_brtmax = param->ifbrp_csize; 1218 bridge_rttrim(sc); 1219 1220 return (0); 1221 } 1222 1223 static int 1224 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1225 { 1226 struct ifbrparam *param = arg; 1227 1228 param->ifbrp_csize = sc->sc_brtmax; 1229 1230 return (0); 1231 } 1232 1233 static int 1234 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1235 { 1236 struct ifbifconf *bifc = arg; 1237 struct bridge_iflist *bif; 1238 struct ifbreq breq; 1239 char *buf, *outbuf; 1240 int count, buflen, len, error = 0; 1241 1242 count = 0; 1243 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1244 count++; 1245 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1246 count++; 1247 1248 buflen = sizeof(breq) * count; 1249 if (bifc->ifbic_len == 0) { 1250 bifc->ifbic_len = buflen; 1251 return (0); 1252 } 1253 BRIDGE_UNLOCK(sc); 1254 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1255 BRIDGE_LOCK(sc); 1256 1257 count = 0; 1258 buf = outbuf; 1259 len = min(bifc->ifbic_len, buflen); 1260 bzero(&breq, sizeof(breq)); 1261 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1262 if (len < sizeof(breq)) 1263 break; 1264 1265 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1266 sizeof(breq.ifbr_ifsname)); 1267 /* Fill in the ifbreq structure */ 1268 error = bridge_ioctl_gifflags(sc, &breq); 1269 if (error) 1270 break; 1271 memcpy(buf, &breq, sizeof(breq)); 1272 count++; 1273 buf += sizeof(breq); 1274 len -= sizeof(breq); 1275 } 1276 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1277 if (len < sizeof(breq)) 1278 break; 1279 1280 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1281 sizeof(breq.ifbr_ifsname)); 1282 breq.ifbr_ifsflags = bif->bif_flags; 1283 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1284 memcpy(buf, &breq, sizeof(breq)); 1285 count++; 1286 buf += sizeof(breq); 1287 len -= sizeof(breq); 1288 } 1289 1290 BRIDGE_UNLOCK(sc); 1291 bifc->ifbic_len = sizeof(breq) * count; 1292 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1293 BRIDGE_LOCK(sc); 1294 free(outbuf, M_TEMP); 1295 return (error); 1296 } 1297 1298 static int 1299 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1300 { 1301 struct ifbaconf *bac = arg; 1302 struct bridge_rtnode *brt; 1303 struct ifbareq bareq; 1304 char *buf, *outbuf; 1305 int count, buflen, len, error = 0; 1306 1307 if (bac->ifbac_len == 0) 1308 return (0); 1309 1310 count = 0; 1311 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1312 count++; 1313 buflen = sizeof(bareq) * count; 1314 1315 BRIDGE_UNLOCK(sc); 1316 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1317 BRIDGE_LOCK(sc); 1318 1319 count = 0; 1320 buf = outbuf; 1321 len = min(bac->ifbac_len, buflen); 1322 bzero(&bareq, sizeof(bareq)); 1323 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1324 if (len < sizeof(bareq)) 1325 goto out; 1326 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1327 sizeof(bareq.ifba_ifsname)); 1328 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1329 bareq.ifba_vlan = brt->brt_vlan; 1330 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1331 time_uptime < brt->brt_expire) 1332 bareq.ifba_expire = brt->brt_expire - time_uptime; 1333 else 1334 bareq.ifba_expire = 0; 1335 bareq.ifba_flags = brt->brt_flags; 1336 1337 memcpy(buf, &bareq, sizeof(bareq)); 1338 count++; 1339 buf += sizeof(bareq); 1340 len -= sizeof(bareq); 1341 } 1342 out: 1343 BRIDGE_UNLOCK(sc); 1344 bac->ifbac_len = sizeof(bareq) * count; 1345 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1346 BRIDGE_LOCK(sc); 1347 free(outbuf, M_TEMP); 1348 return (error); 1349 } 1350 1351 static int 1352 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1353 { 1354 struct ifbareq *req = arg; 1355 struct bridge_iflist *bif; 1356 int error; 1357 1358 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1359 if (bif == NULL) 1360 return (ENOENT); 1361 1362 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1363 req->ifba_flags); 1364 1365 return (error); 1366 } 1367 1368 static int 1369 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1370 { 1371 struct ifbrparam *param = arg; 1372 1373 sc->sc_brttimeout = param->ifbrp_ctime; 1374 return (0); 1375 } 1376 1377 static int 1378 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1379 { 1380 struct ifbrparam *param = arg; 1381 1382 param->ifbrp_ctime = sc->sc_brttimeout; 1383 return (0); 1384 } 1385 1386 static int 1387 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1388 { 1389 struct ifbareq *req = arg; 1390 1391 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1392 } 1393 1394 static int 1395 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1396 { 1397 struct ifbreq *req = arg; 1398 1399 bridge_rtflush(sc, req->ifbr_ifsflags); 1400 return (0); 1401 } 1402 1403 static int 1404 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1405 { 1406 struct ifbrparam *param = arg; 1407 struct bstp_state *bs = &sc->sc_stp; 1408 1409 param->ifbrp_prio = bs->bs_bridge_priority; 1410 return (0); 1411 } 1412 1413 static int 1414 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1415 { 1416 struct ifbrparam *param = arg; 1417 1418 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1419 } 1420 1421 static int 1422 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1423 { 1424 struct ifbrparam *param = arg; 1425 struct bstp_state *bs = &sc->sc_stp; 1426 1427 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1428 return (0); 1429 } 1430 1431 static int 1432 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1433 { 1434 struct ifbrparam *param = arg; 1435 1436 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1437 } 1438 1439 static int 1440 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1441 { 1442 struct ifbrparam *param = arg; 1443 struct bstp_state *bs = &sc->sc_stp; 1444 1445 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1446 return (0); 1447 } 1448 1449 static int 1450 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1451 { 1452 struct ifbrparam *param = arg; 1453 1454 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1455 } 1456 1457 static int 1458 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1459 { 1460 struct ifbrparam *param = arg; 1461 struct bstp_state *bs = &sc->sc_stp; 1462 1463 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1464 return (0); 1465 } 1466 1467 static int 1468 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1469 { 1470 struct ifbrparam *param = arg; 1471 1472 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1473 } 1474 1475 static int 1476 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1477 { 1478 struct ifbreq *req = arg; 1479 struct bridge_iflist *bif; 1480 1481 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1482 if (bif == NULL) 1483 return (ENOENT); 1484 1485 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1486 } 1487 1488 static int 1489 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1490 { 1491 struct ifbreq *req = arg; 1492 struct bridge_iflist *bif; 1493 1494 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1495 if (bif == NULL) 1496 return (ENOENT); 1497 1498 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1499 } 1500 1501 static int 1502 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1503 { 1504 struct ifbreq *req = arg; 1505 struct bridge_iflist *bif; 1506 1507 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1508 if (bif == NULL) 1509 return (ENOENT); 1510 1511 bif->bif_addrmax = req->ifbr_addrmax; 1512 return (0); 1513 } 1514 1515 static int 1516 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1517 { 1518 struct ifbreq *req = arg; 1519 struct bridge_iflist *bif = NULL; 1520 struct ifnet *ifs; 1521 1522 ifs = ifunit(req->ifbr_ifsname); 1523 if (ifs == NULL) 1524 return (ENOENT); 1525 1526 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1527 if (ifs == bif->bif_ifp) 1528 return (EBUSY); 1529 1530 if (ifs->if_bridge != NULL) 1531 return (EBUSY); 1532 1533 switch (ifs->if_type) { 1534 case IFT_ETHER: 1535 case IFT_GIF: 1536 case IFT_L2VLAN: 1537 break; 1538 default: 1539 return (EINVAL); 1540 } 1541 1542 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1543 if (bif == NULL) 1544 return (ENOMEM); 1545 1546 bif->bif_ifp = ifs; 1547 bif->bif_flags = IFBIF_SPAN; 1548 1549 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1550 1551 return (0); 1552 } 1553 1554 static int 1555 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1556 { 1557 struct ifbreq *req = arg; 1558 struct bridge_iflist *bif; 1559 struct ifnet *ifs; 1560 1561 ifs = ifunit(req->ifbr_ifsname); 1562 if (ifs == NULL) 1563 return (ENOENT); 1564 1565 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1566 if (ifs == bif->bif_ifp) 1567 break; 1568 1569 if (bif == NULL) 1570 return (ENOENT); 1571 1572 bridge_delete_span(sc, bif); 1573 1574 return (0); 1575 } 1576 1577 static int 1578 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1579 { 1580 struct ifbropreq *req = arg; 1581 struct bstp_state *bs = &sc->sc_stp; 1582 struct bstp_port *root_port; 1583 1584 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1585 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1586 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1587 1588 root_port = bs->bs_root_port; 1589 if (root_port == NULL) 1590 req->ifbop_root_port = 0; 1591 else 1592 req->ifbop_root_port = root_port->bp_ifp->if_index; 1593 1594 req->ifbop_holdcount = bs->bs_txholdcount; 1595 req->ifbop_priority = bs->bs_bridge_priority; 1596 req->ifbop_protocol = bs->bs_protover; 1597 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1598 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1599 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1600 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1601 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1602 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1603 1604 return (0); 1605 } 1606 1607 static int 1608 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1609 { 1610 struct ifbrparam *param = arg; 1611 1612 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1613 return (0); 1614 } 1615 1616 static int 1617 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1618 { 1619 struct ifbpstpconf *bifstp = arg; 1620 struct bridge_iflist *bif; 1621 struct bstp_port *bp; 1622 struct ifbpstpreq bpreq; 1623 char *buf, *outbuf; 1624 int count, buflen, len, error = 0; 1625 1626 count = 0; 1627 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1628 if ((bif->bif_flags & IFBIF_STP) != 0) 1629 count++; 1630 } 1631 1632 buflen = sizeof(bpreq) * count; 1633 if (bifstp->ifbpstp_len == 0) { 1634 bifstp->ifbpstp_len = buflen; 1635 return (0); 1636 } 1637 1638 BRIDGE_UNLOCK(sc); 1639 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1640 BRIDGE_LOCK(sc); 1641 1642 count = 0; 1643 buf = outbuf; 1644 len = min(bifstp->ifbpstp_len, buflen); 1645 bzero(&bpreq, sizeof(bpreq)); 1646 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1647 if (len < sizeof(bpreq)) 1648 break; 1649 1650 if ((bif->bif_flags & IFBIF_STP) == 0) 1651 continue; 1652 1653 bp = &bif->bif_stp; 1654 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1655 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1656 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1657 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1658 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1659 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1660 1661 memcpy(buf, &bpreq, sizeof(bpreq)); 1662 count++; 1663 buf += sizeof(bpreq); 1664 len -= sizeof(bpreq); 1665 } 1666 1667 BRIDGE_UNLOCK(sc); 1668 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1669 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1670 BRIDGE_LOCK(sc); 1671 free(outbuf, M_TEMP); 1672 return (error); 1673 } 1674 1675 static int 1676 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1677 { 1678 struct ifbrparam *param = arg; 1679 1680 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1681 } 1682 1683 static int 1684 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1685 { 1686 struct ifbrparam *param = arg; 1687 1688 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1689 } 1690 1691 /* 1692 * bridge_ifdetach: 1693 * 1694 * Detach an interface from a bridge. Called when a member 1695 * interface is detaching. 1696 */ 1697 static void 1698 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1699 { 1700 struct bridge_softc *sc = ifp->if_bridge; 1701 struct bridge_iflist *bif; 1702 1703 /* Check if the interface is a bridge member */ 1704 if (sc != NULL) { 1705 BRIDGE_LOCK(sc); 1706 1707 bif = bridge_lookup_member_if(sc, ifp); 1708 if (bif != NULL) 1709 bridge_delete_member(sc, bif, 1); 1710 1711 BRIDGE_UNLOCK(sc); 1712 return; 1713 } 1714 1715 /* Check if the interface is a span port */ 1716 mtx_lock(&bridge_list_mtx); 1717 LIST_FOREACH(sc, &bridge_list, sc_list) { 1718 BRIDGE_LOCK(sc); 1719 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1720 if (ifp == bif->bif_ifp) { 1721 bridge_delete_span(sc, bif); 1722 break; 1723 } 1724 1725 BRIDGE_UNLOCK(sc); 1726 } 1727 mtx_unlock(&bridge_list_mtx); 1728 } 1729 1730 /* 1731 * bridge_init: 1732 * 1733 * Initialize a bridge interface. 1734 */ 1735 static void 1736 bridge_init(void *xsc) 1737 { 1738 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1739 struct ifnet *ifp = sc->sc_ifp; 1740 1741 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1742 return; 1743 1744 BRIDGE_LOCK(sc); 1745 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1746 bridge_timer, sc); 1747 1748 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1749 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1750 1751 BRIDGE_UNLOCK(sc); 1752 } 1753 1754 /* 1755 * bridge_stop: 1756 * 1757 * Stop the bridge interface. 1758 */ 1759 static void 1760 bridge_stop(struct ifnet *ifp, int disable) 1761 { 1762 struct bridge_softc *sc = ifp->if_softc; 1763 1764 BRIDGE_LOCK_ASSERT(sc); 1765 1766 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1767 return; 1768 1769 callout_stop(&sc->sc_brcallout); 1770 bstp_stop(&sc->sc_stp); 1771 1772 bridge_rtflush(sc, IFBF_FLUSHDYN); 1773 1774 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1775 } 1776 1777 /* 1778 * bridge_enqueue: 1779 * 1780 * Enqueue a packet on a bridge member interface. 1781 * 1782 */ 1783 static int 1784 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1785 { 1786 int len, err = 0; 1787 short mflags; 1788 struct mbuf *m0; 1789 1790 /* We may be sending a fragment so traverse the mbuf */ 1791 for (; m; m = m0) { 1792 m0 = m->m_nextpkt; 1793 m->m_nextpkt = NULL; 1794 len = m->m_pkthdr.len; 1795 mflags = m->m_flags; 1796 1797 /* 1798 * If underlying interface can not do VLAN tag insertion itself 1799 * then attach a packet tag that holds it. 1800 */ 1801 if ((m->m_flags & M_VLANTAG) && 1802 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1803 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1804 if (m == NULL) { 1805 if_printf(dst_ifp, 1806 "unable to prepend VLAN header\n"); 1807 dst_ifp->if_oerrors++; 1808 continue; 1809 } 1810 m->m_flags &= ~M_VLANTAG; 1811 } 1812 1813 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1814 m_freem(m0); 1815 sc->sc_ifp->if_oerrors++; 1816 break; 1817 } 1818 1819 sc->sc_ifp->if_opackets++; 1820 sc->sc_ifp->if_obytes += len; 1821 if (mflags & M_MCAST) 1822 sc->sc_ifp->if_omcasts++; 1823 } 1824 1825 return (err); 1826 } 1827 1828 /* 1829 * bridge_dummynet: 1830 * 1831 * Receive a queued packet from dummynet and pass it on to the output 1832 * interface. 1833 * 1834 * The mbuf has the Ethernet header already attached. 1835 */ 1836 static void 1837 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1838 { 1839 struct bridge_softc *sc; 1840 1841 sc = ifp->if_bridge; 1842 1843 /* 1844 * The packet didnt originate from a member interface. This should only 1845 * ever happen if a member interface is removed while packets are 1846 * queued for it. 1847 */ 1848 if (sc == NULL) { 1849 m_freem(m); 1850 return; 1851 } 1852 1853 if (PFIL_HOOKED(&V_inet_pfil_hook) 1854 #ifdef INET6 1855 || PFIL_HOOKED(&V_inet6_pfil_hook) 1856 #endif 1857 ) { 1858 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1859 return; 1860 if (m == NULL) 1861 return; 1862 } 1863 1864 bridge_enqueue(sc, ifp, m); 1865 } 1866 1867 /* 1868 * bridge_output: 1869 * 1870 * Send output from a bridge member interface. This 1871 * performs the bridging function for locally originated 1872 * packets. 1873 * 1874 * The mbuf has the Ethernet header already attached. We must 1875 * enqueue or free the mbuf before returning. 1876 */ 1877 static int 1878 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1879 struct rtentry *rt) 1880 { 1881 struct ether_header *eh; 1882 struct ifnet *dst_if; 1883 struct bridge_softc *sc; 1884 uint16_t vlan; 1885 1886 if (m->m_len < ETHER_HDR_LEN) { 1887 m = m_pullup(m, ETHER_HDR_LEN); 1888 if (m == NULL) 1889 return (0); 1890 } 1891 1892 eh = mtod(m, struct ether_header *); 1893 sc = ifp->if_bridge; 1894 vlan = VLANTAGOF(m); 1895 1896 BRIDGE_LOCK(sc); 1897 1898 /* 1899 * If bridge is down, but the original output interface is up, 1900 * go ahead and send out that interface. Otherwise, the packet 1901 * is dropped below. 1902 */ 1903 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1904 dst_if = ifp; 1905 goto sendunicast; 1906 } 1907 1908 /* 1909 * If the packet is a multicast, or we don't know a better way to 1910 * get there, send to all interfaces. 1911 */ 1912 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1913 dst_if = NULL; 1914 else 1915 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1916 if (dst_if == NULL) { 1917 struct bridge_iflist *bif; 1918 struct mbuf *mc; 1919 int error = 0, used = 0; 1920 1921 bridge_span(sc, m); 1922 1923 BRIDGE_LOCK2REF(sc, error); 1924 if (error) { 1925 m_freem(m); 1926 return (0); 1927 } 1928 1929 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1930 dst_if = bif->bif_ifp; 1931 1932 if (dst_if->if_type == IFT_GIF) 1933 continue; 1934 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1935 continue; 1936 1937 /* 1938 * If this is not the original output interface, 1939 * and the interface is participating in spanning 1940 * tree, make sure the port is in a state that 1941 * allows forwarding. 1942 */ 1943 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1944 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1945 continue; 1946 1947 if (LIST_NEXT(bif, bif_next) == NULL) { 1948 used = 1; 1949 mc = m; 1950 } else { 1951 mc = m_copypacket(m, M_NOWAIT); 1952 if (mc == NULL) { 1953 sc->sc_ifp->if_oerrors++; 1954 continue; 1955 } 1956 } 1957 1958 bridge_enqueue(sc, dst_if, mc); 1959 } 1960 if (used == 0) 1961 m_freem(m); 1962 BRIDGE_UNREF(sc); 1963 return (0); 1964 } 1965 1966 sendunicast: 1967 /* 1968 * XXX Spanning tree consideration here? 1969 */ 1970 1971 bridge_span(sc, m); 1972 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1973 m_freem(m); 1974 BRIDGE_UNLOCK(sc); 1975 return (0); 1976 } 1977 1978 BRIDGE_UNLOCK(sc); 1979 bridge_enqueue(sc, dst_if, m); 1980 return (0); 1981 } 1982 1983 /* 1984 * bridge_transmit: 1985 * 1986 * Do output on a bridge. 1987 * 1988 */ 1989 static int 1990 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 1991 { 1992 struct bridge_softc *sc; 1993 struct ether_header *eh; 1994 struct ifnet *dst_if; 1995 int error = 0; 1996 1997 sc = ifp->if_softc; 1998 1999 ETHER_BPF_MTAP(ifp, m); 2000 2001 eh = mtod(m, struct ether_header *); 2002 2003 BRIDGE_LOCK(sc); 2004 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2005 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2006 BRIDGE_UNLOCK(sc); 2007 error = bridge_enqueue(sc, dst_if, m); 2008 } else 2009 bridge_broadcast(sc, ifp, m, 0); 2010 2011 return (error); 2012 } 2013 2014 /* 2015 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2016 */ 2017 static void 2018 bridge_qflush(struct ifnet *ifp __unused) 2019 { 2020 } 2021 2022 /* 2023 * bridge_forward: 2024 * 2025 * The forwarding function of the bridge. 2026 * 2027 * NOTE: Releases the lock on return. 2028 */ 2029 static void 2030 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2031 struct mbuf *m) 2032 { 2033 struct bridge_iflist *dbif; 2034 struct ifnet *src_if, *dst_if, *ifp; 2035 struct ether_header *eh; 2036 uint16_t vlan; 2037 uint8_t *dst; 2038 int error; 2039 2040 src_if = m->m_pkthdr.rcvif; 2041 ifp = sc->sc_ifp; 2042 2043 ifp->if_ipackets++; 2044 ifp->if_ibytes += m->m_pkthdr.len; 2045 vlan = VLANTAGOF(m); 2046 2047 if ((sbif->bif_flags & IFBIF_STP) && 2048 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2049 goto drop; 2050 2051 eh = mtod(m, struct ether_header *); 2052 dst = eh->ether_dhost; 2053 2054 /* If the interface is learning, record the address. */ 2055 if (sbif->bif_flags & IFBIF_LEARNING) { 2056 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2057 sbif, 0, IFBAF_DYNAMIC); 2058 /* 2059 * If the interface has addresses limits then deny any source 2060 * that is not in the cache. 2061 */ 2062 if (error && sbif->bif_addrmax) 2063 goto drop; 2064 } 2065 2066 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2067 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2068 goto drop; 2069 2070 /* 2071 * At this point, the port either doesn't participate 2072 * in spanning tree or it is in the forwarding state. 2073 */ 2074 2075 /* 2076 * If the packet is unicast, destined for someone on 2077 * "this" side of the bridge, drop it. 2078 */ 2079 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2080 dst_if = bridge_rtlookup(sc, dst, vlan); 2081 if (src_if == dst_if) 2082 goto drop; 2083 } else { 2084 /* 2085 * Check if its a reserved multicast address, any address 2086 * listed in 802.1D section 7.12.6 may not be forwarded by the 2087 * bridge. 2088 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2089 */ 2090 if (dst[0] == 0x01 && dst[1] == 0x80 && 2091 dst[2] == 0xc2 && dst[3] == 0x00 && 2092 dst[4] == 0x00 && dst[5] <= 0x0f) 2093 goto drop; 2094 2095 /* ...forward it to all interfaces. */ 2096 ifp->if_imcasts++; 2097 dst_if = NULL; 2098 } 2099 2100 /* 2101 * If we have a destination interface which is a member of our bridge, 2102 * OR this is a unicast packet, push it through the bpf(4) machinery. 2103 * For broadcast or multicast packets, don't bother because it will 2104 * be reinjected into ether_input. We do this before we pass the packets 2105 * through the pfil(9) framework, as it is possible that pfil(9) will 2106 * drop the packet, or possibly modify it, making it difficult to debug 2107 * firewall issues on the bridge. 2108 */ 2109 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2110 ETHER_BPF_MTAP(ifp, m); 2111 2112 /* run the packet filter */ 2113 if (PFIL_HOOKED(&V_inet_pfil_hook) 2114 #ifdef INET6 2115 || PFIL_HOOKED(&V_inet6_pfil_hook) 2116 #endif 2117 ) { 2118 BRIDGE_UNLOCK(sc); 2119 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2120 return; 2121 if (m == NULL) 2122 return; 2123 BRIDGE_LOCK(sc); 2124 } 2125 2126 if (dst_if == NULL) { 2127 bridge_broadcast(sc, src_if, m, 1); 2128 return; 2129 } 2130 2131 /* 2132 * At this point, we're dealing with a unicast frame 2133 * going to a different interface. 2134 */ 2135 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2136 goto drop; 2137 2138 dbif = bridge_lookup_member_if(sc, dst_if); 2139 if (dbif == NULL) 2140 /* Not a member of the bridge (anymore?) */ 2141 goto drop; 2142 2143 /* Private segments can not talk to each other */ 2144 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2145 goto drop; 2146 2147 if ((dbif->bif_flags & IFBIF_STP) && 2148 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2149 goto drop; 2150 2151 BRIDGE_UNLOCK(sc); 2152 2153 if (PFIL_HOOKED(&V_inet_pfil_hook) 2154 #ifdef INET6 2155 || PFIL_HOOKED(&V_inet6_pfil_hook) 2156 #endif 2157 ) { 2158 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2159 return; 2160 if (m == NULL) 2161 return; 2162 } 2163 2164 bridge_enqueue(sc, dst_if, m); 2165 return; 2166 2167 drop: 2168 BRIDGE_UNLOCK(sc); 2169 m_freem(m); 2170 } 2171 2172 /* 2173 * bridge_input: 2174 * 2175 * Receive input from a member interface. Queue the packet for 2176 * bridging if it is not for us. 2177 */ 2178 static struct mbuf * 2179 bridge_input(struct ifnet *ifp, struct mbuf *m) 2180 { 2181 struct bridge_softc *sc = ifp->if_bridge; 2182 struct bridge_iflist *bif, *bif2; 2183 struct ifnet *bifp; 2184 struct ether_header *eh; 2185 struct mbuf *mc, *mc2; 2186 uint16_t vlan; 2187 int error; 2188 2189 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2190 return (m); 2191 2192 bifp = sc->sc_ifp; 2193 vlan = VLANTAGOF(m); 2194 2195 /* 2196 * Implement support for bridge monitoring. If this flag has been 2197 * set on this interface, discard the packet once we push it through 2198 * the bpf(4) machinery, but before we do, increment the byte and 2199 * packet counters associated with this interface. 2200 */ 2201 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2202 m->m_pkthdr.rcvif = bifp; 2203 ETHER_BPF_MTAP(bifp, m); 2204 bifp->if_ipackets++; 2205 bifp->if_ibytes += m->m_pkthdr.len; 2206 m_freem(m); 2207 return (NULL); 2208 } 2209 BRIDGE_LOCK(sc); 2210 bif = bridge_lookup_member_if(sc, ifp); 2211 if (bif == NULL) { 2212 BRIDGE_UNLOCK(sc); 2213 return (m); 2214 } 2215 2216 eh = mtod(m, struct ether_header *); 2217 2218 bridge_span(sc, m); 2219 2220 if (m->m_flags & (M_BCAST|M_MCAST)) { 2221 /* Tap off 802.1D packets; they do not get forwarded. */ 2222 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2223 ETHER_ADDR_LEN) == 0) { 2224 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2225 BRIDGE_UNLOCK(sc); 2226 return (NULL); 2227 } 2228 2229 if ((bif->bif_flags & IFBIF_STP) && 2230 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2231 BRIDGE_UNLOCK(sc); 2232 return (m); 2233 } 2234 2235 /* 2236 * Make a deep copy of the packet and enqueue the copy 2237 * for bridge processing; return the original packet for 2238 * local processing. 2239 */ 2240 mc = m_dup(m, M_NOWAIT); 2241 if (mc == NULL) { 2242 BRIDGE_UNLOCK(sc); 2243 return (m); 2244 } 2245 2246 /* Perform the bridge forwarding function with the copy. */ 2247 bridge_forward(sc, bif, mc); 2248 2249 /* 2250 * Reinject the mbuf as arriving on the bridge so we have a 2251 * chance at claiming multicast packets. We can not loop back 2252 * here from ether_input as a bridge is never a member of a 2253 * bridge. 2254 */ 2255 KASSERT(bifp->if_bridge == NULL, 2256 ("loop created in bridge_input")); 2257 mc2 = m_dup(m, M_NOWAIT); 2258 if (mc2 != NULL) { 2259 /* Keep the layer3 header aligned */ 2260 int i = min(mc2->m_pkthdr.len, max_protohdr); 2261 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2262 } 2263 if (mc2 != NULL) { 2264 mc2->m_pkthdr.rcvif = bifp; 2265 (*bifp->if_input)(bifp, mc2); 2266 } 2267 2268 /* Return the original packet for local processing. */ 2269 return (m); 2270 } 2271 2272 if ((bif->bif_flags & IFBIF_STP) && 2273 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2274 BRIDGE_UNLOCK(sc); 2275 return (m); 2276 } 2277 2278 #if (defined(INET) || defined(INET6)) 2279 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2280 || ((iface)->if_carp \ 2281 && (*carp_forus_p)((iface), eh->ether_dhost)) 2282 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2283 || ((iface)->if_carp \ 2284 && (*carp_forus_p)((iface), eh->ether_shost)) 2285 #else 2286 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2287 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2288 #endif 2289 2290 #ifdef INET6 2291 # define OR_PFIL_HOOKED_INET6 \ 2292 || PFIL_HOOKED(&V_inet6_pfil_hook) 2293 #else 2294 # define OR_PFIL_HOOKED_INET6 2295 #endif 2296 2297 #define GRAB_OUR_PACKETS(iface) \ 2298 if ((iface)->if_type == IFT_GIF) \ 2299 continue; \ 2300 /* It is destined for us. */ \ 2301 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2302 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2303 ) { \ 2304 if ((iface)->if_type == IFT_BRIDGE) { \ 2305 ETHER_BPF_MTAP(iface, m); \ 2306 iface->if_ipackets++; \ 2307 iface->if_ibytes += m->m_pkthdr.len; \ 2308 /* Filter on the physical interface. */ \ 2309 if (pfil_local_phys && \ 2310 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2311 OR_PFIL_HOOKED_INET6)) { \ 2312 if (bridge_pfil(&m, NULL, ifp, \ 2313 PFIL_IN) != 0 || m == NULL) { \ 2314 BRIDGE_UNLOCK(sc); \ 2315 return (NULL); \ 2316 } \ 2317 } \ 2318 } \ 2319 if (bif->bif_flags & IFBIF_LEARNING) { \ 2320 error = bridge_rtupdate(sc, eh->ether_shost, \ 2321 vlan, bif, 0, IFBAF_DYNAMIC); \ 2322 if (error && bif->bif_addrmax) { \ 2323 BRIDGE_UNLOCK(sc); \ 2324 m_freem(m); \ 2325 return (NULL); \ 2326 } \ 2327 } \ 2328 m->m_pkthdr.rcvif = iface; \ 2329 BRIDGE_UNLOCK(sc); \ 2330 return (m); \ 2331 } \ 2332 \ 2333 /* We just received a packet that we sent out. */ \ 2334 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2335 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2336 ) { \ 2337 BRIDGE_UNLOCK(sc); \ 2338 m_freem(m); \ 2339 return (NULL); \ 2340 } 2341 2342 /* 2343 * Unicast. Make sure it's not for the bridge. 2344 */ 2345 do { GRAB_OUR_PACKETS(bifp) } while (0); 2346 2347 /* 2348 * Give a chance for ifp at first priority. This will help when the 2349 * packet comes through the interface like VLAN's with the same MACs 2350 * on several interfaces from the same bridge. This also will save 2351 * some CPU cycles in case the destination interface and the input 2352 * interface (eq ifp) are the same. 2353 */ 2354 do { GRAB_OUR_PACKETS(ifp) } while (0); 2355 2356 /* Now check the all bridge members. */ 2357 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2358 GRAB_OUR_PACKETS(bif2->bif_ifp) 2359 } 2360 2361 #undef OR_CARP_CHECK_WE_ARE_DST 2362 #undef OR_CARP_CHECK_WE_ARE_SRC 2363 #undef OR_PFIL_HOOKED_INET6 2364 #undef GRAB_OUR_PACKETS 2365 2366 /* Perform the bridge forwarding function. */ 2367 bridge_forward(sc, bif, m); 2368 2369 return (NULL); 2370 } 2371 2372 /* 2373 * bridge_broadcast: 2374 * 2375 * Send a frame to all interfaces that are members of 2376 * the bridge, except for the one on which the packet 2377 * arrived. 2378 * 2379 * NOTE: Releases the lock on return. 2380 */ 2381 static void 2382 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2383 struct mbuf *m, int runfilt) 2384 { 2385 struct bridge_iflist *dbif, *sbif; 2386 struct mbuf *mc; 2387 struct ifnet *dst_if; 2388 int error = 0, used = 0, i; 2389 2390 sbif = bridge_lookup_member_if(sc, src_if); 2391 2392 BRIDGE_LOCK2REF(sc, error); 2393 if (error) { 2394 m_freem(m); 2395 return; 2396 } 2397 2398 /* Filter on the bridge interface before broadcasting */ 2399 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2400 #ifdef INET6 2401 || PFIL_HOOKED(&V_inet6_pfil_hook) 2402 #endif 2403 )) { 2404 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2405 goto out; 2406 if (m == NULL) 2407 goto out; 2408 } 2409 2410 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2411 dst_if = dbif->bif_ifp; 2412 if (dst_if == src_if) 2413 continue; 2414 2415 /* Private segments can not talk to each other */ 2416 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2417 continue; 2418 2419 if ((dbif->bif_flags & IFBIF_STP) && 2420 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2421 continue; 2422 2423 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2424 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2425 continue; 2426 2427 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2428 continue; 2429 2430 if (LIST_NEXT(dbif, bif_next) == NULL) { 2431 mc = m; 2432 used = 1; 2433 } else { 2434 mc = m_dup(m, M_NOWAIT); 2435 if (mc == NULL) { 2436 sc->sc_ifp->if_oerrors++; 2437 continue; 2438 } 2439 } 2440 2441 /* 2442 * Filter on the output interface. Pass a NULL bridge interface 2443 * pointer so we do not redundantly filter on the bridge for 2444 * each interface we broadcast on. 2445 */ 2446 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2447 #ifdef INET6 2448 || PFIL_HOOKED(&V_inet6_pfil_hook) 2449 #endif 2450 )) { 2451 if (used == 0) { 2452 /* Keep the layer3 header aligned */ 2453 i = min(mc->m_pkthdr.len, max_protohdr); 2454 mc = m_copyup(mc, i, ETHER_ALIGN); 2455 if (mc == NULL) { 2456 sc->sc_ifp->if_oerrors++; 2457 continue; 2458 } 2459 } 2460 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2461 continue; 2462 if (mc == NULL) 2463 continue; 2464 } 2465 2466 bridge_enqueue(sc, dst_if, mc); 2467 } 2468 if (used == 0) 2469 m_freem(m); 2470 2471 out: 2472 BRIDGE_UNREF(sc); 2473 } 2474 2475 /* 2476 * bridge_span: 2477 * 2478 * Duplicate a packet out one or more interfaces that are in span mode, 2479 * the original mbuf is unmodified. 2480 */ 2481 static void 2482 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2483 { 2484 struct bridge_iflist *bif; 2485 struct ifnet *dst_if; 2486 struct mbuf *mc; 2487 2488 if (LIST_EMPTY(&sc->sc_spanlist)) 2489 return; 2490 2491 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2492 dst_if = bif->bif_ifp; 2493 2494 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2495 continue; 2496 2497 mc = m_copypacket(m, M_NOWAIT); 2498 if (mc == NULL) { 2499 sc->sc_ifp->if_oerrors++; 2500 continue; 2501 } 2502 2503 bridge_enqueue(sc, dst_if, mc); 2504 } 2505 } 2506 2507 /* 2508 * bridge_rtupdate: 2509 * 2510 * Add a bridge routing entry. 2511 */ 2512 static int 2513 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2514 struct bridge_iflist *bif, int setflags, uint8_t flags) 2515 { 2516 struct bridge_rtnode *brt; 2517 int error; 2518 2519 BRIDGE_LOCK_ASSERT(sc); 2520 2521 /* Check the source address is valid and not multicast. */ 2522 if (ETHER_IS_MULTICAST(dst) || 2523 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2524 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2525 return (EINVAL); 2526 2527 /* 802.1p frames map to vlan 1 */ 2528 if (vlan == 0) 2529 vlan = 1; 2530 2531 /* 2532 * A route for this destination might already exist. If so, 2533 * update it, otherwise create a new one. 2534 */ 2535 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2536 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2537 sc->sc_brtexceeded++; 2538 return (ENOSPC); 2539 } 2540 /* Check per interface address limits (if enabled) */ 2541 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2542 bif->bif_addrexceeded++; 2543 return (ENOSPC); 2544 } 2545 2546 /* 2547 * Allocate a new bridge forwarding node, and 2548 * initialize the expiration time and Ethernet 2549 * address. 2550 */ 2551 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2552 if (brt == NULL) 2553 return (ENOMEM); 2554 2555 if (bif->bif_flags & IFBIF_STICKY) 2556 brt->brt_flags = IFBAF_STICKY; 2557 else 2558 brt->brt_flags = IFBAF_DYNAMIC; 2559 2560 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2561 brt->brt_vlan = vlan; 2562 2563 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2564 uma_zfree(bridge_rtnode_zone, brt); 2565 return (error); 2566 } 2567 brt->brt_dst = bif; 2568 bif->bif_addrcnt++; 2569 } 2570 2571 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2572 brt->brt_dst != bif) { 2573 brt->brt_dst->bif_addrcnt--; 2574 brt->brt_dst = bif; 2575 brt->brt_dst->bif_addrcnt++; 2576 } 2577 2578 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2579 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2580 if (setflags) 2581 brt->brt_flags = flags; 2582 2583 return (0); 2584 } 2585 2586 /* 2587 * bridge_rtlookup: 2588 * 2589 * Lookup the destination interface for an address. 2590 */ 2591 static struct ifnet * 2592 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2593 { 2594 struct bridge_rtnode *brt; 2595 2596 BRIDGE_LOCK_ASSERT(sc); 2597 2598 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2599 return (NULL); 2600 2601 return (brt->brt_ifp); 2602 } 2603 2604 /* 2605 * bridge_rttrim: 2606 * 2607 * Trim the routine table so that we have a number 2608 * of routing entries less than or equal to the 2609 * maximum number. 2610 */ 2611 static void 2612 bridge_rttrim(struct bridge_softc *sc) 2613 { 2614 struct bridge_rtnode *brt, *nbrt; 2615 2616 BRIDGE_LOCK_ASSERT(sc); 2617 2618 /* Make sure we actually need to do this. */ 2619 if (sc->sc_brtcnt <= sc->sc_brtmax) 2620 return; 2621 2622 /* Force an aging cycle; this might trim enough addresses. */ 2623 bridge_rtage(sc); 2624 if (sc->sc_brtcnt <= sc->sc_brtmax) 2625 return; 2626 2627 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2628 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2629 bridge_rtnode_destroy(sc, brt); 2630 if (sc->sc_brtcnt <= sc->sc_brtmax) 2631 return; 2632 } 2633 } 2634 } 2635 2636 /* 2637 * bridge_timer: 2638 * 2639 * Aging timer for the bridge. 2640 */ 2641 static void 2642 bridge_timer(void *arg) 2643 { 2644 struct bridge_softc *sc = arg; 2645 2646 BRIDGE_LOCK_ASSERT(sc); 2647 2648 bridge_rtage(sc); 2649 2650 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2651 callout_reset(&sc->sc_brcallout, 2652 bridge_rtable_prune_period * hz, bridge_timer, sc); 2653 } 2654 2655 /* 2656 * bridge_rtage: 2657 * 2658 * Perform an aging cycle. 2659 */ 2660 static void 2661 bridge_rtage(struct bridge_softc *sc) 2662 { 2663 struct bridge_rtnode *brt, *nbrt; 2664 2665 BRIDGE_LOCK_ASSERT(sc); 2666 2667 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2668 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2669 if (time_uptime >= brt->brt_expire) 2670 bridge_rtnode_destroy(sc, brt); 2671 } 2672 } 2673 } 2674 2675 /* 2676 * bridge_rtflush: 2677 * 2678 * Remove all dynamic addresses from the bridge. 2679 */ 2680 static void 2681 bridge_rtflush(struct bridge_softc *sc, int full) 2682 { 2683 struct bridge_rtnode *brt, *nbrt; 2684 2685 BRIDGE_LOCK_ASSERT(sc); 2686 2687 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2688 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2689 bridge_rtnode_destroy(sc, brt); 2690 } 2691 } 2692 2693 /* 2694 * bridge_rtdaddr: 2695 * 2696 * Remove an address from the table. 2697 */ 2698 static int 2699 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2700 { 2701 struct bridge_rtnode *brt; 2702 int found = 0; 2703 2704 BRIDGE_LOCK_ASSERT(sc); 2705 2706 /* 2707 * If vlan is zero then we want to delete for all vlans so the lookup 2708 * may return more than one. 2709 */ 2710 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2711 bridge_rtnode_destroy(sc, brt); 2712 found = 1; 2713 } 2714 2715 return (found ? 0 : ENOENT); 2716 } 2717 2718 /* 2719 * bridge_rtdelete: 2720 * 2721 * Delete routes to a speicifc member interface. 2722 */ 2723 static void 2724 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2725 { 2726 struct bridge_rtnode *brt, *nbrt; 2727 2728 BRIDGE_LOCK_ASSERT(sc); 2729 2730 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2731 if (brt->brt_ifp == ifp && (full || 2732 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2733 bridge_rtnode_destroy(sc, brt); 2734 } 2735 } 2736 2737 /* 2738 * bridge_rtable_init: 2739 * 2740 * Initialize the route table for this bridge. 2741 */ 2742 static void 2743 bridge_rtable_init(struct bridge_softc *sc) 2744 { 2745 int i; 2746 2747 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2748 M_DEVBUF, M_WAITOK); 2749 2750 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2751 LIST_INIT(&sc->sc_rthash[i]); 2752 2753 sc->sc_rthash_key = arc4random(); 2754 LIST_INIT(&sc->sc_rtlist); 2755 } 2756 2757 /* 2758 * bridge_rtable_fini: 2759 * 2760 * Deconstruct the route table for this bridge. 2761 */ 2762 static void 2763 bridge_rtable_fini(struct bridge_softc *sc) 2764 { 2765 2766 KASSERT(sc->sc_brtcnt == 0, 2767 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2768 free(sc->sc_rthash, M_DEVBUF); 2769 } 2770 2771 /* 2772 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2773 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2774 */ 2775 #define mix(a, b, c) \ 2776 do { \ 2777 a -= b; a -= c; a ^= (c >> 13); \ 2778 b -= c; b -= a; b ^= (a << 8); \ 2779 c -= a; c -= b; c ^= (b >> 13); \ 2780 a -= b; a -= c; a ^= (c >> 12); \ 2781 b -= c; b -= a; b ^= (a << 16); \ 2782 c -= a; c -= b; c ^= (b >> 5); \ 2783 a -= b; a -= c; a ^= (c >> 3); \ 2784 b -= c; b -= a; b ^= (a << 10); \ 2785 c -= a; c -= b; c ^= (b >> 15); \ 2786 } while (/*CONSTCOND*/0) 2787 2788 static __inline uint32_t 2789 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2790 { 2791 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2792 2793 b += addr[5] << 8; 2794 b += addr[4]; 2795 a += addr[3] << 24; 2796 a += addr[2] << 16; 2797 a += addr[1] << 8; 2798 a += addr[0]; 2799 2800 mix(a, b, c); 2801 2802 return (c & BRIDGE_RTHASH_MASK); 2803 } 2804 2805 #undef mix 2806 2807 static int 2808 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2809 { 2810 int i, d; 2811 2812 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2813 d = ((int)a[i]) - ((int)b[i]); 2814 } 2815 2816 return (d); 2817 } 2818 2819 /* 2820 * bridge_rtnode_lookup: 2821 * 2822 * Look up a bridge route node for the specified destination. Compare the 2823 * vlan id or if zero then just return the first match. 2824 */ 2825 static struct bridge_rtnode * 2826 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2827 { 2828 struct bridge_rtnode *brt; 2829 uint32_t hash; 2830 int dir; 2831 2832 BRIDGE_LOCK_ASSERT(sc); 2833 2834 hash = bridge_rthash(sc, addr); 2835 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2836 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2837 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2838 return (brt); 2839 if (dir > 0) 2840 return (NULL); 2841 } 2842 2843 return (NULL); 2844 } 2845 2846 /* 2847 * bridge_rtnode_insert: 2848 * 2849 * Insert the specified bridge node into the route table. We 2850 * assume the entry is not already in the table. 2851 */ 2852 static int 2853 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2854 { 2855 struct bridge_rtnode *lbrt; 2856 uint32_t hash; 2857 int dir; 2858 2859 BRIDGE_LOCK_ASSERT(sc); 2860 2861 hash = bridge_rthash(sc, brt->brt_addr); 2862 2863 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2864 if (lbrt == NULL) { 2865 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2866 goto out; 2867 } 2868 2869 do { 2870 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2871 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2872 return (EEXIST); 2873 if (dir > 0) { 2874 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2875 goto out; 2876 } 2877 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2878 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2879 goto out; 2880 } 2881 lbrt = LIST_NEXT(lbrt, brt_hash); 2882 } while (lbrt != NULL); 2883 2884 #ifdef DIAGNOSTIC 2885 panic("bridge_rtnode_insert: impossible"); 2886 #endif 2887 2888 out: 2889 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2890 sc->sc_brtcnt++; 2891 2892 return (0); 2893 } 2894 2895 /* 2896 * bridge_rtnode_destroy: 2897 * 2898 * Destroy a bridge rtnode. 2899 */ 2900 static void 2901 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2902 { 2903 BRIDGE_LOCK_ASSERT(sc); 2904 2905 LIST_REMOVE(brt, brt_hash); 2906 2907 LIST_REMOVE(brt, brt_list); 2908 sc->sc_brtcnt--; 2909 brt->brt_dst->bif_addrcnt--; 2910 uma_zfree(bridge_rtnode_zone, brt); 2911 } 2912 2913 /* 2914 * bridge_rtable_expire: 2915 * 2916 * Set the expiry time for all routes on an interface. 2917 */ 2918 static void 2919 bridge_rtable_expire(struct ifnet *ifp, int age) 2920 { 2921 struct bridge_softc *sc = ifp->if_bridge; 2922 struct bridge_rtnode *brt; 2923 2924 BRIDGE_LOCK(sc); 2925 2926 /* 2927 * If the age is zero then flush, otherwise set all the expiry times to 2928 * age for the interface 2929 */ 2930 if (age == 0) 2931 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2932 else { 2933 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2934 /* Cap the expiry time to 'age' */ 2935 if (brt->brt_ifp == ifp && 2936 brt->brt_expire > time_uptime + age && 2937 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2938 brt->brt_expire = time_uptime + age; 2939 } 2940 } 2941 BRIDGE_UNLOCK(sc); 2942 } 2943 2944 /* 2945 * bridge_state_change: 2946 * 2947 * Callback from the bridgestp code when a port changes states. 2948 */ 2949 static void 2950 bridge_state_change(struct ifnet *ifp, int state) 2951 { 2952 struct bridge_softc *sc = ifp->if_bridge; 2953 static const char *stpstates[] = { 2954 "disabled", 2955 "listening", 2956 "learning", 2957 "forwarding", 2958 "blocking", 2959 "discarding" 2960 }; 2961 2962 if (log_stp) 2963 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2964 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2965 } 2966 2967 /* 2968 * Send bridge packets through pfil if they are one of the types pfil can deal 2969 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2970 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2971 * that interface. 2972 */ 2973 static int 2974 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2975 { 2976 int snap, error, i, hlen; 2977 struct ether_header *eh1, eh2; 2978 struct ip *ip; 2979 struct llc llc1; 2980 u_int16_t ether_type; 2981 2982 snap = 0; 2983 error = -1; /* Default error if not error == 0 */ 2984 2985 #if 0 2986 /* we may return with the IP fields swapped, ensure its not shared */ 2987 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2988 #endif 2989 2990 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2991 return (0); /* filtering is disabled */ 2992 2993 i = min((*mp)->m_pkthdr.len, max_protohdr); 2994 if ((*mp)->m_len < i) { 2995 *mp = m_pullup(*mp, i); 2996 if (*mp == NULL) { 2997 printf("%s: m_pullup failed\n", __func__); 2998 return (-1); 2999 } 3000 } 3001 3002 eh1 = mtod(*mp, struct ether_header *); 3003 ether_type = ntohs(eh1->ether_type); 3004 3005 /* 3006 * Check for SNAP/LLC. 3007 */ 3008 if (ether_type < ETHERMTU) { 3009 struct llc *llc2 = (struct llc *)(eh1 + 1); 3010 3011 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3012 llc2->llc_dsap == LLC_SNAP_LSAP && 3013 llc2->llc_ssap == LLC_SNAP_LSAP && 3014 llc2->llc_control == LLC_UI) { 3015 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3016 snap = 1; 3017 } 3018 } 3019 3020 /* 3021 * If we're trying to filter bridge traffic, don't look at anything 3022 * other than IP and ARP traffic. If the filter doesn't understand 3023 * IPv6, don't allow IPv6 through the bridge either. This is lame 3024 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3025 * but of course we don't have an AppleTalk filter to begin with. 3026 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3027 * ARP traffic.) 3028 */ 3029 switch (ether_type) { 3030 case ETHERTYPE_ARP: 3031 case ETHERTYPE_REVARP: 3032 if (pfil_ipfw_arp == 0) 3033 return (0); /* Automatically pass */ 3034 break; 3035 3036 case ETHERTYPE_IP: 3037 #ifdef INET6 3038 case ETHERTYPE_IPV6: 3039 #endif /* INET6 */ 3040 break; 3041 default: 3042 /* 3043 * Check to see if the user wants to pass non-ip 3044 * packets, these will not be checked by pfil(9) and 3045 * passed unconditionally so the default is to drop. 3046 */ 3047 if (pfil_onlyip) 3048 goto bad; 3049 } 3050 3051 /* Run the packet through pfil before stripping link headers */ 3052 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3053 dir == PFIL_OUT && ifp != NULL) { 3054 3055 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3056 3057 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3058 return (error); 3059 } 3060 3061 /* Strip off the Ethernet header and keep a copy. */ 3062 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3063 m_adj(*mp, ETHER_HDR_LEN); 3064 3065 /* Strip off snap header, if present */ 3066 if (snap) { 3067 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3068 m_adj(*mp, sizeof(struct llc)); 3069 } 3070 3071 /* 3072 * Check the IP header for alignment and errors 3073 */ 3074 if (dir == PFIL_IN) { 3075 switch (ether_type) { 3076 case ETHERTYPE_IP: 3077 error = bridge_ip_checkbasic(mp); 3078 break; 3079 #ifdef INET6 3080 case ETHERTYPE_IPV6: 3081 error = bridge_ip6_checkbasic(mp); 3082 break; 3083 #endif /* INET6 */ 3084 default: 3085 error = 0; 3086 } 3087 if (error) 3088 goto bad; 3089 } 3090 3091 error = 0; 3092 3093 /* 3094 * Run the packet through pfil 3095 */ 3096 switch (ether_type) { 3097 case ETHERTYPE_IP: 3098 /* 3099 * Run pfil on the member interface and the bridge, both can 3100 * be skipped by clearing pfil_member or pfil_bridge. 3101 * 3102 * Keep the order: 3103 * in_if -> bridge_if -> out_if 3104 */ 3105 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3106 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3107 dir, NULL); 3108 3109 if (*mp == NULL || error != 0) /* filter may consume */ 3110 break; 3111 3112 if (pfil_member && ifp != NULL) 3113 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3114 dir, NULL); 3115 3116 if (*mp == NULL || error != 0) /* filter may consume */ 3117 break; 3118 3119 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3120 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3121 dir, NULL); 3122 3123 if (*mp == NULL || error != 0) /* filter may consume */ 3124 break; 3125 3126 /* check if we need to fragment the packet */ 3127 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3128 i = (*mp)->m_pkthdr.len; 3129 if (i > ifp->if_mtu) { 3130 error = bridge_fragment(ifp, *mp, &eh2, snap, 3131 &llc1); 3132 return (error); 3133 } 3134 } 3135 3136 /* Recalculate the ip checksum. */ 3137 ip = mtod(*mp, struct ip *); 3138 hlen = ip->ip_hl << 2; 3139 if (hlen < sizeof(struct ip)) 3140 goto bad; 3141 if (hlen > (*mp)->m_len) { 3142 if ((*mp = m_pullup(*mp, hlen)) == 0) 3143 goto bad; 3144 ip = mtod(*mp, struct ip *); 3145 if (ip == NULL) 3146 goto bad; 3147 } 3148 ip->ip_sum = 0; 3149 if (hlen == sizeof(struct ip)) 3150 ip->ip_sum = in_cksum_hdr(ip); 3151 else 3152 ip->ip_sum = in_cksum(*mp, hlen); 3153 3154 break; 3155 #ifdef INET6 3156 case ETHERTYPE_IPV6: 3157 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3158 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3159 dir, NULL); 3160 3161 if (*mp == NULL || error != 0) /* filter may consume */ 3162 break; 3163 3164 if (pfil_member && ifp != NULL) 3165 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3166 dir, NULL); 3167 3168 if (*mp == NULL || error != 0) /* filter may consume */ 3169 break; 3170 3171 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3172 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3173 dir, NULL); 3174 break; 3175 #endif 3176 default: 3177 error = 0; 3178 break; 3179 } 3180 3181 if (*mp == NULL) 3182 return (error); 3183 if (error != 0) 3184 goto bad; 3185 3186 error = -1; 3187 3188 /* 3189 * Finally, put everything back the way it was and return 3190 */ 3191 if (snap) { 3192 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3193 if (*mp == NULL) 3194 return (error); 3195 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3196 } 3197 3198 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3199 if (*mp == NULL) 3200 return (error); 3201 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3202 3203 return (0); 3204 3205 bad: 3206 m_freem(*mp); 3207 *mp = NULL; 3208 return (error); 3209 } 3210 3211 /* 3212 * Perform basic checks on header size since 3213 * pfil assumes ip_input has already processed 3214 * it for it. Cut-and-pasted from ip_input.c. 3215 * Given how simple the IPv6 version is, 3216 * does the IPv4 version really need to be 3217 * this complicated? 3218 * 3219 * XXX Should we update ipstat here, or not? 3220 * XXX Right now we update ipstat but not 3221 * XXX csum_counter. 3222 */ 3223 static int 3224 bridge_ip_checkbasic(struct mbuf **mp) 3225 { 3226 struct mbuf *m = *mp; 3227 struct ip *ip; 3228 int len, hlen; 3229 u_short sum; 3230 3231 if (*mp == NULL) 3232 return (-1); 3233 3234 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3235 if ((m = m_copyup(m, sizeof(struct ip), 3236 (max_linkhdr + 3) & ~3)) == NULL) { 3237 /* XXXJRT new stat, please */ 3238 KMOD_IPSTAT_INC(ips_toosmall); 3239 goto bad; 3240 } 3241 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3242 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3243 KMOD_IPSTAT_INC(ips_toosmall); 3244 goto bad; 3245 } 3246 } 3247 ip = mtod(m, struct ip *); 3248 if (ip == NULL) goto bad; 3249 3250 if (ip->ip_v != IPVERSION) { 3251 KMOD_IPSTAT_INC(ips_badvers); 3252 goto bad; 3253 } 3254 hlen = ip->ip_hl << 2; 3255 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3256 KMOD_IPSTAT_INC(ips_badhlen); 3257 goto bad; 3258 } 3259 if (hlen > m->m_len) { 3260 if ((m = m_pullup(m, hlen)) == 0) { 3261 KMOD_IPSTAT_INC(ips_badhlen); 3262 goto bad; 3263 } 3264 ip = mtod(m, struct ip *); 3265 if (ip == NULL) goto bad; 3266 } 3267 3268 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3269 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3270 } else { 3271 if (hlen == sizeof(struct ip)) { 3272 sum = in_cksum_hdr(ip); 3273 } else { 3274 sum = in_cksum(m, hlen); 3275 } 3276 } 3277 if (sum) { 3278 KMOD_IPSTAT_INC(ips_badsum); 3279 goto bad; 3280 } 3281 3282 /* Retrieve the packet length. */ 3283 len = ntohs(ip->ip_len); 3284 3285 /* 3286 * Check for additional length bogosity 3287 */ 3288 if (len < hlen) { 3289 KMOD_IPSTAT_INC(ips_badlen); 3290 goto bad; 3291 } 3292 3293 /* 3294 * Check that the amount of data in the buffers 3295 * is as at least much as the IP header would have us expect. 3296 * Drop packet if shorter than we expect. 3297 */ 3298 if (m->m_pkthdr.len < len) { 3299 KMOD_IPSTAT_INC(ips_tooshort); 3300 goto bad; 3301 } 3302 3303 /* Checks out, proceed */ 3304 *mp = m; 3305 return (0); 3306 3307 bad: 3308 *mp = m; 3309 return (-1); 3310 } 3311 3312 #ifdef INET6 3313 /* 3314 * Same as above, but for IPv6. 3315 * Cut-and-pasted from ip6_input.c. 3316 * XXX Should we update ip6stat, or not? 3317 */ 3318 static int 3319 bridge_ip6_checkbasic(struct mbuf **mp) 3320 { 3321 struct mbuf *m = *mp; 3322 struct ip6_hdr *ip6; 3323 3324 /* 3325 * If the IPv6 header is not aligned, slurp it up into a new 3326 * mbuf with space for link headers, in the event we forward 3327 * it. Otherwise, if it is aligned, make sure the entire base 3328 * IPv6 header is in the first mbuf of the chain. 3329 */ 3330 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3331 struct ifnet *inifp = m->m_pkthdr.rcvif; 3332 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3333 (max_linkhdr + 3) & ~3)) == NULL) { 3334 /* XXXJRT new stat, please */ 3335 V_ip6stat.ip6s_toosmall++; 3336 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3337 goto bad; 3338 } 3339 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3340 struct ifnet *inifp = m->m_pkthdr.rcvif; 3341 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3342 V_ip6stat.ip6s_toosmall++; 3343 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3344 goto bad; 3345 } 3346 } 3347 3348 ip6 = mtod(m, struct ip6_hdr *); 3349 3350 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3351 V_ip6stat.ip6s_badvers++; 3352 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3353 goto bad; 3354 } 3355 3356 /* Checks out, proceed */ 3357 *mp = m; 3358 return (0); 3359 3360 bad: 3361 *mp = m; 3362 return (-1); 3363 } 3364 #endif /* INET6 */ 3365 3366 /* 3367 * bridge_fragment: 3368 * 3369 * Return a fragmented mbuf chain. 3370 */ 3371 static int 3372 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3373 int snap, struct llc *llc) 3374 { 3375 struct mbuf *m0; 3376 struct ip *ip; 3377 int error = -1; 3378 3379 if (m->m_len < sizeof(struct ip) && 3380 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3381 goto out; 3382 ip = mtod(m, struct ip *); 3383 3384 m->m_pkthdr.csum_flags |= CSUM_IP; 3385 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3386 if (error) 3387 goto out; 3388 3389 /* walk the chain and re-add the Ethernet header */ 3390 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3391 if (error == 0) { 3392 if (snap) { 3393 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT); 3394 if (m0 == NULL) { 3395 error = ENOBUFS; 3396 continue; 3397 } 3398 bcopy(llc, mtod(m0, caddr_t), 3399 sizeof(struct llc)); 3400 } 3401 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 3402 if (m0 == NULL) { 3403 error = ENOBUFS; 3404 continue; 3405 } 3406 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3407 } else 3408 m_freem(m); 3409 } 3410 3411 if (error == 0) 3412 KMOD_IPSTAT_INC(ips_fragmented); 3413 3414 return (error); 3415 3416 out: 3417 if (m != NULL) 3418 m_freem(m); 3419 return (error); 3420 } 3421 3422 static void 3423 bridge_linkstate(struct ifnet *ifp) 3424 { 3425 struct bridge_softc *sc = ifp->if_bridge; 3426 struct bridge_iflist *bif; 3427 3428 BRIDGE_LOCK(sc); 3429 bif = bridge_lookup_member_if(sc, ifp); 3430 if (bif == NULL) { 3431 BRIDGE_UNLOCK(sc); 3432 return; 3433 } 3434 bridge_linkcheck(sc); 3435 BRIDGE_UNLOCK(sc); 3436 3437 bstp_linkstate(&bif->bif_stp); 3438 } 3439 3440 static void 3441 bridge_linkcheck(struct bridge_softc *sc) 3442 { 3443 struct bridge_iflist *bif; 3444 int new_link, hasls; 3445 3446 BRIDGE_LOCK_ASSERT(sc); 3447 new_link = LINK_STATE_DOWN; 3448 hasls = 0; 3449 /* Our link is considered up if at least one of our ports is active */ 3450 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3451 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3452 hasls++; 3453 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3454 new_link = LINK_STATE_UP; 3455 break; 3456 } 3457 } 3458 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3459 /* If no interfaces support link-state then we default to up */ 3460 new_link = LINK_STATE_UP; 3461 } 3462 if_link_state_change(sc->sc_ifp, new_link); 3463 } 3464