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