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 #include <sys/vimage.h> 105 106 #include <net/bpf.h> 107 #include <net/if.h> 108 #include <net/if_clone.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_var.h> 112 #include <net/pfil.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 #include <netinet/vinet.h> 120 #ifdef INET6 121 #include <netinet/ip6.h> 122 #include <netinet6/ip6_var.h> 123 #include <netinet6/vinet6.h> 124 #endif 125 #ifdef DEV_CARP 126 #include <netinet/ip_carp.h> 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/ip_dummynet.h> 138 139 /* 140 * Size of the route hash table. Must be a power of two. 141 */ 142 #ifndef BRIDGE_RTHASH_SIZE 143 #define BRIDGE_RTHASH_SIZE 1024 144 #endif 145 146 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 147 148 /* 149 * Maximum number of addresses to cache. 150 */ 151 #ifndef BRIDGE_RTABLE_MAX 152 #define BRIDGE_RTABLE_MAX 100 153 #endif 154 155 /* 156 * Timeout (in seconds) for entries learned dynamically. 157 */ 158 #ifndef BRIDGE_RTABLE_TIMEOUT 159 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 160 #endif 161 162 /* 163 * Number of seconds between walks of the route list. 164 */ 165 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 166 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 167 #endif 168 169 /* 170 * List of capabilities to possibly mask on the member interface. 171 */ 172 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 173 174 /* 175 * Bridge interface list entry. 176 */ 177 struct bridge_iflist { 178 LIST_ENTRY(bridge_iflist) bif_next; 179 struct ifnet *bif_ifp; /* member if */ 180 struct bstp_port bif_stp; /* STP state */ 181 uint32_t bif_flags; /* member if flags */ 182 int bif_savedcaps; /* saved capabilities */ 183 uint32_t bif_addrmax; /* max # of addresses */ 184 uint32_t bif_addrcnt; /* cur. # of addresses */ 185 uint32_t bif_addrexceeded;/* # of address violations */ 186 }; 187 188 /* 189 * Bridge route node. 190 */ 191 struct bridge_rtnode { 192 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 193 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 194 struct bridge_iflist *brt_dst; /* destination if */ 195 unsigned long brt_expire; /* expiration time */ 196 uint8_t brt_flags; /* address flags */ 197 uint8_t brt_addr[ETHER_ADDR_LEN]; 198 uint16_t brt_vlan; /* vlan id */ 199 }; 200 #define brt_ifp brt_dst->bif_ifp 201 202 /* 203 * Software state for each bridge. 204 */ 205 struct bridge_softc { 206 struct ifnet *sc_ifp; /* make this an interface */ 207 LIST_ENTRY(bridge_softc) sc_list; 208 struct mtx sc_mtx; 209 struct cv sc_cv; 210 uint32_t sc_brtmax; /* max # of addresses */ 211 uint32_t sc_brtcnt; /* cur. # of addresses */ 212 uint32_t sc_brttimeout; /* rt timeout in seconds */ 213 struct callout sc_brcallout; /* bridge callout */ 214 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 215 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 216 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 217 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 218 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 219 uint32_t sc_rthash_key; /* key for hash */ 220 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 221 struct bstp_state sc_stp; /* STP state */ 222 uint32_t sc_brtexceeded; /* # of cache drops */ 223 u_char sc_defaddr[6]; /* Default MAC address */ 224 }; 225 226 static struct mtx bridge_list_mtx; 227 eventhandler_tag bridge_detach_cookie = NULL; 228 229 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 230 231 uma_zone_t bridge_rtnode_zone; 232 233 static int bridge_clone_create(struct if_clone *, int, caddr_t); 234 static void bridge_clone_destroy(struct ifnet *); 235 236 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 237 static void bridge_mutecaps(struct bridge_softc *); 238 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 239 int); 240 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 241 static void bridge_init(void *); 242 static void bridge_dummynet(struct mbuf *, struct ifnet *); 243 static void bridge_stop(struct ifnet *, int); 244 static void bridge_start(struct ifnet *); 245 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 246 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 247 struct rtentry *); 248 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 249 struct mbuf *); 250 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 251 252 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 253 struct mbuf *m); 254 255 static void bridge_timer(void *); 256 257 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 258 struct mbuf *, int); 259 static void bridge_span(struct bridge_softc *, struct mbuf *); 260 261 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 262 uint16_t, struct bridge_iflist *, int, uint8_t); 263 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 264 uint16_t); 265 static void bridge_rttrim(struct bridge_softc *); 266 static void bridge_rtage(struct bridge_softc *); 267 static void bridge_rtflush(struct bridge_softc *, int); 268 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 269 uint16_t); 270 271 static int bridge_rtable_init(struct bridge_softc *); 272 static void bridge_rtable_fini(struct bridge_softc *); 273 274 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 275 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 276 const uint8_t *, uint16_t); 277 static int bridge_rtnode_insert(struct bridge_softc *, 278 struct bridge_rtnode *); 279 static void bridge_rtnode_destroy(struct bridge_softc *, 280 struct bridge_rtnode *); 281 static void bridge_rtable_expire(struct ifnet *, int); 282 static void bridge_state_change(struct ifnet *, int); 283 284 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 285 const char *name); 286 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 287 struct ifnet *ifp); 288 static void bridge_delete_member(struct bridge_softc *, 289 struct bridge_iflist *, int); 290 static void bridge_delete_span(struct bridge_softc *, 291 struct bridge_iflist *); 292 293 static int bridge_ioctl_add(struct bridge_softc *, void *); 294 static int bridge_ioctl_del(struct bridge_softc *, void *); 295 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 297 static int bridge_ioctl_scache(struct bridge_softc *, void *); 298 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 299 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 300 static int bridge_ioctl_rts(struct bridge_softc *, void *); 301 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 302 static int bridge_ioctl_sto(struct bridge_softc *, void *); 303 static int bridge_ioctl_gto(struct bridge_softc *, void *); 304 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 305 static int bridge_ioctl_flush(struct bridge_softc *, void *); 306 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 307 static int bridge_ioctl_spri(struct bridge_softc *, void *); 308 static int bridge_ioctl_ght(struct bridge_softc *, void *); 309 static int bridge_ioctl_sht(struct bridge_softc *, void *); 310 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 311 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 312 static int bridge_ioctl_gma(struct bridge_softc *, void *); 313 static int bridge_ioctl_sma(struct bridge_softc *, void *); 314 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 315 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 316 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 317 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 318 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 319 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 320 static int bridge_ioctl_grte(struct bridge_softc *, void *); 321 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 322 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 323 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 324 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 325 int); 326 static int bridge_ip_checkbasic(struct mbuf **mp); 327 #ifdef INET6 328 static int bridge_ip6_checkbasic(struct mbuf **mp); 329 #endif /* INET6 */ 330 static int bridge_fragment(struct ifnet *, struct mbuf *, 331 struct ether_header *, int, struct llc *); 332 333 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 334 #define VLANTAGOF(_m) \ 335 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 336 337 static struct bstp_cb_ops bridge_ops = { 338 .bcb_state = bridge_state_change, 339 .bcb_rtage = bridge_rtable_expire 340 }; 341 342 SYSCTL_DECL(_net_link); 343 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 344 345 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 346 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 347 static int pfil_member = 1; /* run pfil hooks on the member interface */ 348 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 349 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 350 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 351 locally destined packets */ 352 static int log_stp = 0; /* log STP state changes */ 353 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 354 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 355 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 356 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 357 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 359 &pfil_bridge, 0, "Packet filter on the bridge interface"); 360 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 361 &pfil_member, 0, "Packet filter on the member interface"); 362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 363 &pfil_local_phys, 0, 364 "Packet filter on the physical interface for locally destined packets"); 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 366 &log_stp, 0, "Log STP state changes"); 367 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 368 &bridge_inherit_mac, 0, 369 "Inherit MAC address from the first bridge member"); 370 371 struct bridge_control { 372 int (*bc_func)(struct bridge_softc *, void *); 373 int bc_argsize; 374 int bc_flags; 375 }; 376 377 #define BC_F_COPYIN 0x01 /* copy arguments in */ 378 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 379 #define BC_F_SUSER 0x04 /* do super-user check */ 380 381 const struct bridge_control bridge_control_table[] = { 382 { bridge_ioctl_add, sizeof(struct ifbreq), 383 BC_F_COPYIN|BC_F_SUSER }, 384 { bridge_ioctl_del, sizeof(struct ifbreq), 385 BC_F_COPYIN|BC_F_SUSER }, 386 387 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 388 BC_F_COPYIN|BC_F_COPYOUT }, 389 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 390 BC_F_COPYIN|BC_F_SUSER }, 391 392 { bridge_ioctl_scache, sizeof(struct ifbrparam), 393 BC_F_COPYIN|BC_F_SUSER }, 394 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 395 BC_F_COPYOUT }, 396 397 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 398 BC_F_COPYIN|BC_F_COPYOUT }, 399 { bridge_ioctl_rts, sizeof(struct ifbaconf), 400 BC_F_COPYIN|BC_F_COPYOUT }, 401 402 { bridge_ioctl_saddr, sizeof(struct ifbareq), 403 BC_F_COPYIN|BC_F_SUSER }, 404 405 { bridge_ioctl_sto, sizeof(struct ifbrparam), 406 BC_F_COPYIN|BC_F_SUSER }, 407 { bridge_ioctl_gto, sizeof(struct ifbrparam), 408 BC_F_COPYOUT }, 409 410 { bridge_ioctl_daddr, sizeof(struct ifbareq), 411 BC_F_COPYIN|BC_F_SUSER }, 412 413 { bridge_ioctl_flush, sizeof(struct ifbreq), 414 BC_F_COPYIN|BC_F_SUSER }, 415 416 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 417 BC_F_COPYOUT }, 418 { bridge_ioctl_spri, sizeof(struct ifbrparam), 419 BC_F_COPYIN|BC_F_SUSER }, 420 421 { bridge_ioctl_ght, sizeof(struct ifbrparam), 422 BC_F_COPYOUT }, 423 { bridge_ioctl_sht, sizeof(struct ifbrparam), 424 BC_F_COPYIN|BC_F_SUSER }, 425 426 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 427 BC_F_COPYOUT }, 428 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 429 BC_F_COPYIN|BC_F_SUSER }, 430 431 { bridge_ioctl_gma, sizeof(struct ifbrparam), 432 BC_F_COPYOUT }, 433 { bridge_ioctl_sma, sizeof(struct ifbrparam), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 437 BC_F_COPYIN|BC_F_SUSER }, 438 439 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 440 BC_F_COPYIN|BC_F_SUSER }, 441 442 { bridge_ioctl_addspan, sizeof(struct ifbreq), 443 BC_F_COPYIN|BC_F_SUSER }, 444 { bridge_ioctl_delspan, sizeof(struct ifbreq), 445 BC_F_COPYIN|BC_F_SUSER }, 446 447 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 448 BC_F_COPYOUT }, 449 450 { bridge_ioctl_grte, sizeof(struct ifbrparam), 451 BC_F_COPYOUT }, 452 453 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 454 BC_F_COPYIN|BC_F_COPYOUT }, 455 456 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 457 BC_F_COPYIN|BC_F_SUSER }, 458 459 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 460 BC_F_COPYIN|BC_F_SUSER }, 461 462 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 463 BC_F_COPYIN|BC_F_SUSER }, 464 465 }; 466 const int bridge_control_table_size = 467 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 468 469 LIST_HEAD(, bridge_softc) bridge_list; 470 471 IFC_SIMPLE_DECLARE(bridge, 0); 472 473 static int 474 bridge_modevent(module_t mod, int type, void *data) 475 { 476 477 switch (type) { 478 case MOD_LOAD: 479 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 480 if_clone_attach(&bridge_cloner); 481 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 482 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 483 UMA_ALIGN_PTR, 0); 484 LIST_INIT(&bridge_list); 485 bridge_input_p = bridge_input; 486 bridge_output_p = bridge_output; 487 bridge_dn_p = bridge_dummynet; 488 bridge_detach_cookie = EVENTHANDLER_REGISTER( 489 ifnet_departure_event, bridge_ifdetach, NULL, 490 EVENTHANDLER_PRI_ANY); 491 break; 492 case MOD_UNLOAD: 493 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 494 bridge_detach_cookie); 495 if_clone_detach(&bridge_cloner); 496 uma_zdestroy(bridge_rtnode_zone); 497 bridge_input_p = NULL; 498 bridge_output_p = NULL; 499 bridge_dn_p = NULL; 500 mtx_destroy(&bridge_list_mtx); 501 break; 502 default: 503 return (EOPNOTSUPP); 504 } 505 return (0); 506 } 507 508 static moduledata_t bridge_mod = { 509 "if_bridge", 510 bridge_modevent, 511 0 512 }; 513 514 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 515 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 516 517 /* 518 * handler for net.link.bridge.pfil_ipfw 519 */ 520 static int 521 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 522 { 523 int enable = pfil_ipfw; 524 int error; 525 526 error = sysctl_handle_int(oidp, &enable, 0, req); 527 enable = (enable) ? 1 : 0; 528 529 if (enable != pfil_ipfw) { 530 pfil_ipfw = enable; 531 532 /* 533 * Disable pfil so that ipfw doesnt run twice, if the user 534 * really wants both then they can re-enable pfil_bridge and/or 535 * pfil_member. Also allow non-ip packets as ipfw can filter by 536 * layer2 type. 537 */ 538 if (pfil_ipfw) { 539 pfil_onlyip = 0; 540 pfil_bridge = 0; 541 pfil_member = 0; 542 } 543 } 544 545 return (error); 546 } 547 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 548 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 549 550 /* 551 * bridge_clone_create: 552 * 553 * Create a new bridge instance. 554 */ 555 static int 556 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 557 { 558 struct bridge_softc *sc, *sc2; 559 struct ifnet *bifp, *ifp; 560 int retry; 561 562 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 563 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 564 if (ifp == NULL) { 565 free(sc, M_DEVBUF); 566 return (ENOSPC); 567 } 568 569 BRIDGE_LOCK_INIT(sc); 570 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 571 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 572 573 /* Initialize our routing table. */ 574 bridge_rtable_init(sc); 575 576 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 577 578 LIST_INIT(&sc->sc_iflist); 579 LIST_INIT(&sc->sc_spanlist); 580 581 ifp->if_softc = sc; 582 if_initname(ifp, ifc->ifc_name, unit); 583 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 584 ifp->if_ioctl = bridge_ioctl; 585 ifp->if_start = bridge_start; 586 ifp->if_init = bridge_init; 587 ifp->if_type = IFT_BRIDGE; 588 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 589 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 590 IFQ_SET_READY(&ifp->if_snd); 591 592 /* 593 * Generate a random ethernet address with a locally administered 594 * address. 595 * 596 * Since we are using random ethernet addresses for the bridge, it is 597 * possible that we might have address collisions, so make sure that 598 * this hardware address isn't already in use on another bridge. 599 */ 600 for (retry = 1; retry != 0;) { 601 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 602 sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ 603 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 604 retry = 0; 605 mtx_lock(&bridge_list_mtx); 606 LIST_FOREACH(sc2, &bridge_list, sc_list) { 607 bifp = sc2->sc_ifp; 608 if (memcmp(sc->sc_defaddr, 609 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 610 retry = 1; 611 } 612 mtx_unlock(&bridge_list_mtx); 613 } 614 615 bstp_attach(&sc->sc_stp, &bridge_ops); 616 ether_ifattach(ifp, sc->sc_defaddr); 617 /* Now undo some of the damage... */ 618 ifp->if_baudrate = 0; 619 ifp->if_type = IFT_BRIDGE; 620 621 mtx_lock(&bridge_list_mtx); 622 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 623 mtx_unlock(&bridge_list_mtx); 624 625 return (0); 626 } 627 628 /* 629 * bridge_clone_destroy: 630 * 631 * Destroy a bridge instance. 632 */ 633 static void 634 bridge_clone_destroy(struct ifnet *ifp) 635 { 636 struct bridge_softc *sc = ifp->if_softc; 637 struct bridge_iflist *bif; 638 639 BRIDGE_LOCK(sc); 640 641 bridge_stop(ifp, 1); 642 ifp->if_flags &= ~IFF_UP; 643 644 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 645 bridge_delete_member(sc, bif, 0); 646 647 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 648 bridge_delete_span(sc, bif); 649 } 650 651 BRIDGE_UNLOCK(sc); 652 653 callout_drain(&sc->sc_brcallout); 654 655 mtx_lock(&bridge_list_mtx); 656 LIST_REMOVE(sc, sc_list); 657 mtx_unlock(&bridge_list_mtx); 658 659 bstp_detach(&sc->sc_stp); 660 ether_ifdetach(ifp); 661 if_free_type(ifp, IFT_ETHER); 662 663 /* Tear down the routing table. */ 664 bridge_rtable_fini(sc); 665 666 BRIDGE_LOCK_DESTROY(sc); 667 free(sc, M_DEVBUF); 668 } 669 670 /* 671 * bridge_ioctl: 672 * 673 * Handle a control request from the operator. 674 */ 675 static int 676 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 677 { 678 struct bridge_softc *sc = ifp->if_softc; 679 struct thread *td = curthread; 680 union { 681 struct ifbreq ifbreq; 682 struct ifbifconf ifbifconf; 683 struct ifbareq ifbareq; 684 struct ifbaconf ifbaconf; 685 struct ifbrparam ifbrparam; 686 struct ifbropreq ifbropreq; 687 } args; 688 struct ifdrv *ifd = (struct ifdrv *) data; 689 const struct bridge_control *bc; 690 int error = 0; 691 692 switch (cmd) { 693 694 case SIOCADDMULTI: 695 case SIOCDELMULTI: 696 break; 697 698 case SIOCGDRVSPEC: 699 case SIOCSDRVSPEC: 700 if (ifd->ifd_cmd >= bridge_control_table_size) { 701 error = EINVAL; 702 break; 703 } 704 bc = &bridge_control_table[ifd->ifd_cmd]; 705 706 if (cmd == SIOCGDRVSPEC && 707 (bc->bc_flags & BC_F_COPYOUT) == 0) { 708 error = EINVAL; 709 break; 710 } 711 else if (cmd == SIOCSDRVSPEC && 712 (bc->bc_flags & BC_F_COPYOUT) != 0) { 713 error = EINVAL; 714 break; 715 } 716 717 if (bc->bc_flags & BC_F_SUSER) { 718 error = priv_check(td, PRIV_NET_BRIDGE); 719 if (error) 720 break; 721 } 722 723 if (ifd->ifd_len != bc->bc_argsize || 724 ifd->ifd_len > sizeof(args)) { 725 error = EINVAL; 726 break; 727 } 728 729 bzero(&args, sizeof(args)); 730 if (bc->bc_flags & BC_F_COPYIN) { 731 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 732 if (error) 733 break; 734 } 735 736 BRIDGE_LOCK(sc); 737 error = (*bc->bc_func)(sc, &args); 738 BRIDGE_UNLOCK(sc); 739 if (error) 740 break; 741 742 if (bc->bc_flags & BC_F_COPYOUT) 743 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 744 745 break; 746 747 case SIOCSIFFLAGS: 748 if (!(ifp->if_flags & IFF_UP) && 749 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 750 /* 751 * If interface is marked down and it is running, 752 * then stop and disable it. 753 */ 754 BRIDGE_LOCK(sc); 755 bridge_stop(ifp, 1); 756 BRIDGE_UNLOCK(sc); 757 } else if ((ifp->if_flags & IFF_UP) && 758 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 759 /* 760 * If interface is marked up and it is stopped, then 761 * start it. 762 */ 763 (*ifp->if_init)(sc); 764 } 765 break; 766 767 case SIOCSIFMTU: 768 /* Do not allow the MTU to be changed on the bridge */ 769 error = EINVAL; 770 break; 771 772 default: 773 /* 774 * drop the lock as ether_ioctl() will call bridge_start() and 775 * cause the lock to be recursed. 776 */ 777 error = ether_ioctl(ifp, cmd, data); 778 break; 779 } 780 781 return (error); 782 } 783 784 /* 785 * bridge_mutecaps: 786 * 787 * Clear or restore unwanted capabilities on the member interface 788 */ 789 static void 790 bridge_mutecaps(struct bridge_softc *sc) 791 { 792 struct bridge_iflist *bif; 793 int enabled, mask; 794 795 /* Initial bitmask of capabilities to test */ 796 mask = BRIDGE_IFCAPS_MASK; 797 798 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 799 /* Every member must support it or its disabled */ 800 mask &= bif->bif_savedcaps; 801 } 802 803 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 804 enabled = bif->bif_ifp->if_capenable; 805 /* strip off mask bits and enable them again if allowed */ 806 enabled &= ~BRIDGE_IFCAPS_MASK; 807 enabled |= mask; 808 /* 809 * Receive offload can only be enabled if all members also 810 * support send offload. 811 */ 812 if ((enabled & IFCAP_TSO) == 0) 813 enabled &= ~IFCAP_LRO; 814 815 bridge_set_ifcap(sc, bif, enabled); 816 } 817 818 } 819 820 static void 821 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 822 { 823 struct ifnet *ifp = bif->bif_ifp; 824 struct ifreq ifr; 825 int error; 826 827 bzero(&ifr, sizeof(ifr)); 828 ifr.ifr_reqcap = set; 829 830 if (ifp->if_capenable != set) { 831 IFF_LOCKGIANT(ifp); 832 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 833 IFF_UNLOCKGIANT(ifp); 834 if (error) 835 if_printf(sc->sc_ifp, 836 "error setting interface capabilities on %s\n", 837 ifp->if_xname); 838 } 839 } 840 841 /* 842 * bridge_lookup_member: 843 * 844 * Lookup a bridge member interface. 845 */ 846 static struct bridge_iflist * 847 bridge_lookup_member(struct bridge_softc *sc, const char *name) 848 { 849 struct bridge_iflist *bif; 850 struct ifnet *ifp; 851 852 BRIDGE_LOCK_ASSERT(sc); 853 854 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 855 ifp = bif->bif_ifp; 856 if (strcmp(ifp->if_xname, name) == 0) 857 return (bif); 858 } 859 860 return (NULL); 861 } 862 863 /* 864 * bridge_lookup_member_if: 865 * 866 * Lookup a bridge member interface by ifnet*. 867 */ 868 static struct bridge_iflist * 869 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 870 { 871 struct bridge_iflist *bif; 872 873 BRIDGE_LOCK_ASSERT(sc); 874 875 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 876 if (bif->bif_ifp == member_ifp) 877 return (bif); 878 } 879 880 return (NULL); 881 } 882 883 /* 884 * bridge_delete_member: 885 * 886 * Delete the specified member interface. 887 */ 888 static void 889 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 890 int gone) 891 { 892 struct ifnet *ifs = bif->bif_ifp; 893 struct ifnet *fif = NULL; 894 895 BRIDGE_LOCK_ASSERT(sc); 896 897 if (!gone) { 898 switch (ifs->if_type) { 899 case IFT_ETHER: 900 case IFT_L2VLAN: 901 /* 902 * Take the interface out of promiscuous mode. 903 */ 904 (void) ifpromisc(ifs, 0); 905 break; 906 907 case IFT_GIF: 908 break; 909 910 default: 911 #ifdef DIAGNOSTIC 912 panic("bridge_delete_member: impossible"); 913 #endif 914 break; 915 } 916 /* reneable any interface capabilities */ 917 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 918 } 919 920 if (bif->bif_flags & IFBIF_STP) 921 bstp_disable(&bif->bif_stp); 922 923 ifs->if_bridge = NULL; 924 BRIDGE_XLOCK(sc); 925 LIST_REMOVE(bif, bif_next); 926 BRIDGE_XDROP(sc); 927 928 /* 929 * If removing the interface that gave the bridge its mac address, set 930 * the mac address of the bridge to the address of the next member, or 931 * to its default address if no members are left. 932 */ 933 if (bridge_inherit_mac && 934 !memcmp(IF_LLADDR(sc->sc_ifp), IF_LLADDR(ifs), ETHER_ADDR_LEN)) { 935 if (LIST_EMPTY(&sc->sc_iflist)) 936 bcopy(sc->sc_defaddr, 937 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 938 else { 939 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 940 bcopy(IF_LLADDR(fif), 941 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 942 } 943 } 944 945 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 946 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 947 KASSERT(bif->bif_addrcnt == 0, 948 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 949 950 BRIDGE_UNLOCK(sc); 951 bstp_destroy(&bif->bif_stp); /* prepare to free */ 952 BRIDGE_LOCK(sc); 953 free(bif, M_DEVBUF); 954 } 955 956 /* 957 * bridge_delete_span: 958 * 959 * Delete the specified span interface. 960 */ 961 static void 962 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 963 { 964 BRIDGE_LOCK_ASSERT(sc); 965 966 KASSERT(bif->bif_ifp->if_bridge == NULL, 967 ("%s: not a span interface", __func__)); 968 969 LIST_REMOVE(bif, bif_next); 970 free(bif, M_DEVBUF); 971 } 972 973 static int 974 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 975 { 976 struct ifbreq *req = arg; 977 struct bridge_iflist *bif = NULL; 978 struct ifnet *ifs; 979 int error = 0; 980 981 ifs = ifunit(req->ifbr_ifsname); 982 if (ifs == NULL) 983 return (ENOENT); 984 if (ifs->if_ioctl == NULL) /* must be supported */ 985 return (EINVAL); 986 987 /* If it's in the span list, it can't be a member. */ 988 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 989 if (ifs == bif->bif_ifp) 990 return (EBUSY); 991 992 /* Allow the first Ethernet member to define the MTU */ 993 if (ifs->if_type != IFT_GIF) { 994 if (LIST_EMPTY(&sc->sc_iflist)) 995 sc->sc_ifp->if_mtu = ifs->if_mtu; 996 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 997 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 998 ifs->if_xname); 999 return (EINVAL); 1000 } 1001 } 1002 1003 if (ifs->if_bridge == sc) 1004 return (EEXIST); 1005 1006 if (ifs->if_bridge != NULL) 1007 return (EBUSY); 1008 1009 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1010 if (bif == NULL) 1011 return (ENOMEM); 1012 1013 bif->bif_ifp = ifs; 1014 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1015 bif->bif_savedcaps = ifs->if_capenable; 1016 1017 switch (ifs->if_type) { 1018 case IFT_ETHER: 1019 case IFT_L2VLAN: 1020 /* 1021 * Place the interface into promiscuous mode. 1022 */ 1023 error = ifpromisc(ifs, 1); 1024 if (error) 1025 goto out; 1026 break; 1027 1028 case IFT_GIF: 1029 break; 1030 1031 default: 1032 error = EINVAL; 1033 goto out; 1034 } 1035 1036 /* 1037 * Assign the interface's MAC address to the bridge if it's the first 1038 * member and the MAC address of the bridge has not been changed from 1039 * the default randomly generated one. 1040 */ 1041 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1042 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) 1043 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1044 1045 ifs->if_bridge = sc; 1046 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1047 /* 1048 * XXX: XLOCK HERE!?! 1049 * 1050 * NOTE: insert_***HEAD*** should be safe for the traversals. 1051 */ 1052 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1053 1054 /* Set interface capabilities to the intersection set of all members */ 1055 bridge_mutecaps(sc); 1056 out: 1057 if (error) { 1058 if (bif != NULL) 1059 free(bif, M_DEVBUF); 1060 } 1061 return (error); 1062 } 1063 1064 static int 1065 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1066 { 1067 struct ifbreq *req = arg; 1068 struct bridge_iflist *bif; 1069 1070 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1071 if (bif == NULL) 1072 return (ENOENT); 1073 1074 bridge_delete_member(sc, bif, 0); 1075 1076 return (0); 1077 } 1078 1079 static int 1080 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1081 { 1082 struct ifbreq *req = arg; 1083 struct bridge_iflist *bif; 1084 struct bstp_port *bp; 1085 1086 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1087 if (bif == NULL) 1088 return (ENOENT); 1089 1090 bp = &bif->bif_stp; 1091 req->ifbr_ifsflags = bif->bif_flags; 1092 req->ifbr_state = bp->bp_state; 1093 req->ifbr_priority = bp->bp_priority; 1094 req->ifbr_path_cost = bp->bp_path_cost; 1095 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1096 req->ifbr_proto = bp->bp_protover; 1097 req->ifbr_role = bp->bp_role; 1098 req->ifbr_stpflags = bp->bp_flags; 1099 req->ifbr_addrcnt = bif->bif_addrcnt; 1100 req->ifbr_addrmax = bif->bif_addrmax; 1101 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1102 1103 /* Copy STP state options as flags */ 1104 if (bp->bp_operedge) 1105 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1106 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1107 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1108 if (bp->bp_ptp_link) 1109 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1110 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1111 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1112 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1113 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1114 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1115 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1116 return (0); 1117 } 1118 1119 static int 1120 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1121 { 1122 struct ifbreq *req = arg; 1123 struct bridge_iflist *bif; 1124 struct bstp_port *bp; 1125 int error; 1126 1127 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1128 if (bif == NULL) 1129 return (ENOENT); 1130 bp = &bif->bif_stp; 1131 1132 if (req->ifbr_ifsflags & IFBIF_SPAN) 1133 /* SPAN is readonly */ 1134 return (EINVAL); 1135 1136 if (req->ifbr_ifsflags & IFBIF_STP) { 1137 if ((bif->bif_flags & IFBIF_STP) == 0) { 1138 error = bstp_enable(&bif->bif_stp); 1139 if (error) 1140 return (error); 1141 } 1142 } else { 1143 if ((bif->bif_flags & IFBIF_STP) != 0) 1144 bstp_disable(&bif->bif_stp); 1145 } 1146 1147 /* Pass on STP flags */ 1148 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1149 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1150 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1151 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1152 1153 /* Save the bits relating to the bridge */ 1154 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1155 1156 return (0); 1157 } 1158 1159 static int 1160 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1161 { 1162 struct ifbrparam *param = arg; 1163 1164 sc->sc_brtmax = param->ifbrp_csize; 1165 bridge_rttrim(sc); 1166 1167 return (0); 1168 } 1169 1170 static int 1171 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1172 { 1173 struct ifbrparam *param = arg; 1174 1175 param->ifbrp_csize = sc->sc_brtmax; 1176 1177 return (0); 1178 } 1179 1180 static int 1181 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1182 { 1183 struct ifbifconf *bifc = arg; 1184 struct bridge_iflist *bif; 1185 struct ifbreq breq; 1186 char *buf, *outbuf; 1187 int count, buflen, len, error = 0; 1188 1189 count = 0; 1190 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1191 count++; 1192 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1193 count++; 1194 1195 buflen = sizeof(breq) * count; 1196 if (bifc->ifbic_len == 0) { 1197 bifc->ifbic_len = buflen; 1198 return (0); 1199 } 1200 BRIDGE_UNLOCK(sc); 1201 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1202 BRIDGE_LOCK(sc); 1203 1204 count = 0; 1205 buf = outbuf; 1206 len = min(bifc->ifbic_len, buflen); 1207 bzero(&breq, sizeof(breq)); 1208 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1209 if (len < sizeof(breq)) 1210 break; 1211 1212 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1213 sizeof(breq.ifbr_ifsname)); 1214 /* Fill in the ifbreq structure */ 1215 error = bridge_ioctl_gifflags(sc, &breq); 1216 if (error) 1217 break; 1218 memcpy(buf, &breq, sizeof(breq)); 1219 count++; 1220 buf += sizeof(breq); 1221 len -= sizeof(breq); 1222 } 1223 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1224 if (len < sizeof(breq)) 1225 break; 1226 1227 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1228 sizeof(breq.ifbr_ifsname)); 1229 breq.ifbr_ifsflags = bif->bif_flags; 1230 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1231 memcpy(buf, &breq, sizeof(breq)); 1232 count++; 1233 buf += sizeof(breq); 1234 len -= sizeof(breq); 1235 } 1236 1237 BRIDGE_UNLOCK(sc); 1238 bifc->ifbic_len = sizeof(breq) * count; 1239 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1240 BRIDGE_LOCK(sc); 1241 free(outbuf, M_TEMP); 1242 return (error); 1243 } 1244 1245 static int 1246 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1247 { 1248 struct ifbaconf *bac = arg; 1249 struct bridge_rtnode *brt; 1250 struct ifbareq bareq; 1251 char *buf, *outbuf; 1252 int count, buflen, len, error = 0; 1253 1254 if (bac->ifbac_len == 0) 1255 return (0); 1256 1257 count = 0; 1258 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1259 count++; 1260 buflen = sizeof(bareq) * count; 1261 1262 BRIDGE_UNLOCK(sc); 1263 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1264 BRIDGE_LOCK(sc); 1265 1266 count = 0; 1267 buf = outbuf; 1268 len = min(bac->ifbac_len, buflen); 1269 bzero(&bareq, sizeof(bareq)); 1270 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1271 if (len < sizeof(bareq)) 1272 goto out; 1273 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1274 sizeof(bareq.ifba_ifsname)); 1275 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1276 bareq.ifba_vlan = brt->brt_vlan; 1277 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1278 time_uptime < brt->brt_expire) 1279 bareq.ifba_expire = brt->brt_expire - time_uptime; 1280 else 1281 bareq.ifba_expire = 0; 1282 bareq.ifba_flags = brt->brt_flags; 1283 1284 memcpy(buf, &bareq, sizeof(bareq)); 1285 count++; 1286 buf += sizeof(bareq); 1287 len -= sizeof(bareq); 1288 } 1289 out: 1290 BRIDGE_UNLOCK(sc); 1291 bac->ifbac_len = sizeof(bareq) * count; 1292 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1293 BRIDGE_LOCK(sc); 1294 free(outbuf, M_TEMP); 1295 return (error); 1296 } 1297 1298 static int 1299 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1300 { 1301 struct ifbareq *req = arg; 1302 struct bridge_iflist *bif; 1303 int error; 1304 1305 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1306 if (bif == NULL) 1307 return (ENOENT); 1308 1309 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1310 req->ifba_flags); 1311 1312 return (error); 1313 } 1314 1315 static int 1316 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1317 { 1318 struct ifbrparam *param = arg; 1319 1320 sc->sc_brttimeout = param->ifbrp_ctime; 1321 return (0); 1322 } 1323 1324 static int 1325 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1326 { 1327 struct ifbrparam *param = arg; 1328 1329 param->ifbrp_ctime = sc->sc_brttimeout; 1330 return (0); 1331 } 1332 1333 static int 1334 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1335 { 1336 struct ifbareq *req = arg; 1337 1338 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1339 } 1340 1341 static int 1342 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1343 { 1344 struct ifbreq *req = arg; 1345 1346 bridge_rtflush(sc, req->ifbr_ifsflags); 1347 return (0); 1348 } 1349 1350 static int 1351 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1352 { 1353 struct ifbrparam *param = arg; 1354 struct bstp_state *bs = &sc->sc_stp; 1355 1356 param->ifbrp_prio = bs->bs_bridge_priority; 1357 return (0); 1358 } 1359 1360 static int 1361 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1362 { 1363 struct ifbrparam *param = arg; 1364 1365 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1366 } 1367 1368 static int 1369 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1370 { 1371 struct ifbrparam *param = arg; 1372 struct bstp_state *bs = &sc->sc_stp; 1373 1374 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1375 return (0); 1376 } 1377 1378 static int 1379 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1380 { 1381 struct ifbrparam *param = arg; 1382 1383 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1384 } 1385 1386 static int 1387 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1388 { 1389 struct ifbrparam *param = arg; 1390 struct bstp_state *bs = &sc->sc_stp; 1391 1392 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1393 return (0); 1394 } 1395 1396 static int 1397 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1398 { 1399 struct ifbrparam *param = arg; 1400 1401 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1402 } 1403 1404 static int 1405 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1406 { 1407 struct ifbrparam *param = arg; 1408 struct bstp_state *bs = &sc->sc_stp; 1409 1410 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1411 return (0); 1412 } 1413 1414 static int 1415 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1416 { 1417 struct ifbrparam *param = arg; 1418 1419 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1420 } 1421 1422 static int 1423 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1424 { 1425 struct ifbreq *req = arg; 1426 struct bridge_iflist *bif; 1427 1428 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1429 if (bif == NULL) 1430 return (ENOENT); 1431 1432 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1433 } 1434 1435 static int 1436 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1437 { 1438 struct ifbreq *req = arg; 1439 struct bridge_iflist *bif; 1440 1441 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1442 if (bif == NULL) 1443 return (ENOENT); 1444 1445 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1446 } 1447 1448 static int 1449 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1450 { 1451 struct ifbreq *req = arg; 1452 struct bridge_iflist *bif; 1453 1454 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1455 if (bif == NULL) 1456 return (ENOENT); 1457 1458 bif->bif_addrmax = req->ifbr_addrmax; 1459 return (0); 1460 } 1461 1462 static int 1463 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1464 { 1465 struct ifbreq *req = arg; 1466 struct bridge_iflist *bif = NULL; 1467 struct ifnet *ifs; 1468 1469 ifs = ifunit(req->ifbr_ifsname); 1470 if (ifs == NULL) 1471 return (ENOENT); 1472 1473 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1474 if (ifs == bif->bif_ifp) 1475 return (EBUSY); 1476 1477 if (ifs->if_bridge != NULL) 1478 return (EBUSY); 1479 1480 switch (ifs->if_type) { 1481 case IFT_ETHER: 1482 case IFT_GIF: 1483 case IFT_L2VLAN: 1484 break; 1485 default: 1486 return (EINVAL); 1487 } 1488 1489 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1490 if (bif == NULL) 1491 return (ENOMEM); 1492 1493 bif->bif_ifp = ifs; 1494 bif->bif_flags = IFBIF_SPAN; 1495 1496 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1497 1498 return (0); 1499 } 1500 1501 static int 1502 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1503 { 1504 struct ifbreq *req = arg; 1505 struct bridge_iflist *bif; 1506 struct ifnet *ifs; 1507 1508 ifs = ifunit(req->ifbr_ifsname); 1509 if (ifs == NULL) 1510 return (ENOENT); 1511 1512 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1513 if (ifs == bif->bif_ifp) 1514 break; 1515 1516 if (bif == NULL) 1517 return (ENOENT); 1518 1519 bridge_delete_span(sc, bif); 1520 1521 return (0); 1522 } 1523 1524 static int 1525 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1526 { 1527 struct ifbropreq *req = arg; 1528 struct bstp_state *bs = &sc->sc_stp; 1529 struct bstp_port *root_port; 1530 1531 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1532 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1533 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1534 1535 root_port = bs->bs_root_port; 1536 if (root_port == NULL) 1537 req->ifbop_root_port = 0; 1538 else 1539 req->ifbop_root_port = root_port->bp_ifp->if_index; 1540 1541 req->ifbop_holdcount = bs->bs_txholdcount; 1542 req->ifbop_priority = bs->bs_bridge_priority; 1543 req->ifbop_protocol = bs->bs_protover; 1544 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1545 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1546 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1547 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1548 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1549 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1550 1551 return (0); 1552 } 1553 1554 static int 1555 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1556 { 1557 struct ifbrparam *param = arg; 1558 1559 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1560 return (0); 1561 } 1562 1563 static int 1564 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1565 { 1566 struct ifbpstpconf *bifstp = arg; 1567 struct bridge_iflist *bif; 1568 struct bstp_port *bp; 1569 struct ifbpstpreq bpreq; 1570 char *buf, *outbuf; 1571 int count, buflen, len, error = 0; 1572 1573 count = 0; 1574 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1575 if ((bif->bif_flags & IFBIF_STP) != 0) 1576 count++; 1577 } 1578 1579 buflen = sizeof(bpreq) * count; 1580 if (bifstp->ifbpstp_len == 0) { 1581 bifstp->ifbpstp_len = buflen; 1582 return (0); 1583 } 1584 1585 BRIDGE_UNLOCK(sc); 1586 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1587 BRIDGE_LOCK(sc); 1588 1589 count = 0; 1590 buf = outbuf; 1591 len = min(bifstp->ifbpstp_len, buflen); 1592 bzero(&bpreq, sizeof(bpreq)); 1593 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1594 if (len < sizeof(bpreq)) 1595 break; 1596 1597 if ((bif->bif_flags & IFBIF_STP) == 0) 1598 continue; 1599 1600 bp = &bif->bif_stp; 1601 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1602 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1603 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1604 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1605 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1606 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1607 1608 memcpy(buf, &bpreq, sizeof(bpreq)); 1609 count++; 1610 buf += sizeof(bpreq); 1611 len -= sizeof(bpreq); 1612 } 1613 1614 BRIDGE_UNLOCK(sc); 1615 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1616 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1617 BRIDGE_LOCK(sc); 1618 free(outbuf, M_TEMP); 1619 return (error); 1620 } 1621 1622 static int 1623 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1624 { 1625 struct ifbrparam *param = arg; 1626 1627 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1628 } 1629 1630 static int 1631 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1632 { 1633 struct ifbrparam *param = arg; 1634 1635 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1636 } 1637 1638 /* 1639 * bridge_ifdetach: 1640 * 1641 * Detach an interface from a bridge. Called when a member 1642 * interface is detaching. 1643 */ 1644 static void 1645 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1646 { 1647 struct bridge_softc *sc = ifp->if_bridge; 1648 struct bridge_iflist *bif; 1649 1650 /* Check if the interface is a bridge member */ 1651 if (sc != NULL) { 1652 BRIDGE_LOCK(sc); 1653 1654 bif = bridge_lookup_member_if(sc, ifp); 1655 if (bif != NULL) 1656 bridge_delete_member(sc, bif, 1); 1657 1658 BRIDGE_UNLOCK(sc); 1659 return; 1660 } 1661 1662 /* Check if the interface is a span port */ 1663 mtx_lock(&bridge_list_mtx); 1664 LIST_FOREACH(sc, &bridge_list, sc_list) { 1665 BRIDGE_LOCK(sc); 1666 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1667 if (ifp == bif->bif_ifp) { 1668 bridge_delete_span(sc, bif); 1669 break; 1670 } 1671 1672 BRIDGE_UNLOCK(sc); 1673 } 1674 mtx_unlock(&bridge_list_mtx); 1675 } 1676 1677 /* 1678 * bridge_init: 1679 * 1680 * Initialize a bridge interface. 1681 */ 1682 static void 1683 bridge_init(void *xsc) 1684 { 1685 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1686 struct ifnet *ifp = sc->sc_ifp; 1687 1688 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1689 return; 1690 1691 BRIDGE_LOCK(sc); 1692 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1693 bridge_timer, sc); 1694 1695 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1696 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1697 1698 BRIDGE_UNLOCK(sc); 1699 } 1700 1701 /* 1702 * bridge_stop: 1703 * 1704 * Stop the bridge interface. 1705 */ 1706 static void 1707 bridge_stop(struct ifnet *ifp, int disable) 1708 { 1709 struct bridge_softc *sc = ifp->if_softc; 1710 1711 BRIDGE_LOCK_ASSERT(sc); 1712 1713 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1714 return; 1715 1716 callout_stop(&sc->sc_brcallout); 1717 bstp_stop(&sc->sc_stp); 1718 1719 bridge_rtflush(sc, IFBF_FLUSHDYN); 1720 1721 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1722 } 1723 1724 /* 1725 * bridge_enqueue: 1726 * 1727 * Enqueue a packet on a bridge member interface. 1728 * 1729 */ 1730 static void 1731 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1732 { 1733 int len, err = 0; 1734 short mflags; 1735 struct mbuf *m0; 1736 1737 len = m->m_pkthdr.len; 1738 mflags = m->m_flags; 1739 1740 /* We may be sending a fragment so traverse the mbuf */ 1741 for (; m; m = m0) { 1742 m0 = m->m_nextpkt; 1743 m->m_nextpkt = NULL; 1744 1745 /* 1746 * If underlying interface can not do VLAN tag insertion itself 1747 * then attach a packet tag that holds it. 1748 */ 1749 if ((m->m_flags & M_VLANTAG) && 1750 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1751 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1752 if (m == NULL) { 1753 if_printf(dst_ifp, 1754 "unable to prepend VLAN header\n"); 1755 dst_ifp->if_oerrors++; 1756 continue; 1757 } 1758 m->m_flags &= ~M_VLANTAG; 1759 } 1760 1761 if (err == 0) 1762 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1763 } 1764 1765 if (err == 0) { 1766 1767 sc->sc_ifp->if_opackets++; 1768 sc->sc_ifp->if_obytes += len; 1769 1770 dst_ifp->if_obytes += len; 1771 1772 if (mflags & M_MCAST) { 1773 sc->sc_ifp->if_omcasts++; 1774 dst_ifp->if_omcasts++; 1775 } 1776 } 1777 1778 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1779 (*dst_ifp->if_start)(dst_ifp); 1780 } 1781 1782 /* 1783 * bridge_dummynet: 1784 * 1785 * Receive a queued packet from dummynet and pass it on to the output 1786 * interface. 1787 * 1788 * The mbuf has the Ethernet header already attached. 1789 */ 1790 static void 1791 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1792 { 1793 struct bridge_softc *sc; 1794 1795 sc = ifp->if_bridge; 1796 1797 /* 1798 * The packet didnt originate from a member interface. This should only 1799 * ever happen if a member interface is removed while packets are 1800 * queued for it. 1801 */ 1802 if (sc == NULL) { 1803 m_freem(m); 1804 return; 1805 } 1806 1807 if (PFIL_HOOKED(&inet_pfil_hook) 1808 #ifdef INET6 1809 || PFIL_HOOKED(&inet6_pfil_hook) 1810 #endif 1811 ) { 1812 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1813 return; 1814 if (m == NULL) 1815 return; 1816 } 1817 1818 bridge_enqueue(sc, ifp, m); 1819 } 1820 1821 /* 1822 * bridge_output: 1823 * 1824 * Send output from a bridge member interface. This 1825 * performs the bridging function for locally originated 1826 * packets. 1827 * 1828 * The mbuf has the Ethernet header already attached. We must 1829 * enqueue or free the mbuf before returning. 1830 */ 1831 static int 1832 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1833 struct rtentry *rt) 1834 { 1835 struct ether_header *eh; 1836 struct ifnet *dst_if; 1837 struct bridge_softc *sc; 1838 uint16_t vlan; 1839 1840 if (m->m_len < ETHER_HDR_LEN) { 1841 m = m_pullup(m, ETHER_HDR_LEN); 1842 if (m == NULL) 1843 return (0); 1844 } 1845 1846 eh = mtod(m, struct ether_header *); 1847 sc = ifp->if_bridge; 1848 vlan = VLANTAGOF(m); 1849 1850 BRIDGE_LOCK(sc); 1851 1852 /* 1853 * If bridge is down, but the original output interface is up, 1854 * go ahead and send out that interface. Otherwise, the packet 1855 * is dropped below. 1856 */ 1857 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1858 dst_if = ifp; 1859 goto sendunicast; 1860 } 1861 1862 /* 1863 * If the packet is a multicast, or we don't know a better way to 1864 * get there, send to all interfaces. 1865 */ 1866 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1867 dst_if = NULL; 1868 else 1869 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1870 if (dst_if == NULL) { 1871 struct bridge_iflist *bif; 1872 struct mbuf *mc; 1873 int error = 0, used = 0; 1874 1875 bridge_span(sc, m); 1876 1877 BRIDGE_LOCK2REF(sc, error); 1878 if (error) { 1879 m_freem(m); 1880 return (0); 1881 } 1882 1883 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1884 dst_if = bif->bif_ifp; 1885 1886 if (dst_if->if_type == IFT_GIF) 1887 continue; 1888 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1889 continue; 1890 1891 /* 1892 * If this is not the original output interface, 1893 * and the interface is participating in spanning 1894 * tree, make sure the port is in a state that 1895 * allows forwarding. 1896 */ 1897 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1898 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1899 continue; 1900 1901 if (LIST_NEXT(bif, bif_next) == NULL) { 1902 used = 1; 1903 mc = m; 1904 } else { 1905 mc = m_copypacket(m, M_DONTWAIT); 1906 if (mc == NULL) { 1907 sc->sc_ifp->if_oerrors++; 1908 continue; 1909 } 1910 } 1911 1912 bridge_enqueue(sc, dst_if, mc); 1913 } 1914 if (used == 0) 1915 m_freem(m); 1916 BRIDGE_UNREF(sc); 1917 return (0); 1918 } 1919 1920 sendunicast: 1921 /* 1922 * XXX Spanning tree consideration here? 1923 */ 1924 1925 bridge_span(sc, m); 1926 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1927 m_freem(m); 1928 BRIDGE_UNLOCK(sc); 1929 return (0); 1930 } 1931 1932 BRIDGE_UNLOCK(sc); 1933 bridge_enqueue(sc, dst_if, m); 1934 return (0); 1935 } 1936 1937 /* 1938 * bridge_start: 1939 * 1940 * Start output on a bridge. 1941 * 1942 */ 1943 static void 1944 bridge_start(struct ifnet *ifp) 1945 { 1946 struct bridge_softc *sc; 1947 struct mbuf *m; 1948 struct ether_header *eh; 1949 struct ifnet *dst_if; 1950 1951 sc = ifp->if_softc; 1952 1953 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1954 for (;;) { 1955 IFQ_DEQUEUE(&ifp->if_snd, m); 1956 if (m == 0) 1957 break; 1958 ETHER_BPF_MTAP(ifp, m); 1959 1960 eh = mtod(m, struct ether_header *); 1961 dst_if = NULL; 1962 1963 BRIDGE_LOCK(sc); 1964 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1965 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1966 } 1967 1968 if (dst_if == NULL) 1969 bridge_broadcast(sc, ifp, m, 0); 1970 else { 1971 BRIDGE_UNLOCK(sc); 1972 bridge_enqueue(sc, dst_if, m); 1973 } 1974 } 1975 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1976 } 1977 1978 /* 1979 * bridge_forward: 1980 * 1981 * The forwarding function of the bridge. 1982 * 1983 * NOTE: Releases the lock on return. 1984 */ 1985 static void 1986 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1987 struct mbuf *m) 1988 { 1989 struct bridge_iflist *dbif; 1990 struct ifnet *src_if, *dst_if, *ifp; 1991 struct ether_header *eh; 1992 uint16_t vlan; 1993 uint8_t *dst; 1994 int error; 1995 1996 src_if = m->m_pkthdr.rcvif; 1997 ifp = sc->sc_ifp; 1998 1999 ifp->if_ipackets++; 2000 ifp->if_ibytes += m->m_pkthdr.len; 2001 vlan = VLANTAGOF(m); 2002 2003 if ((sbif->bif_flags & IFBIF_STP) && 2004 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2005 goto drop; 2006 2007 eh = mtod(m, struct ether_header *); 2008 dst = eh->ether_dhost; 2009 2010 /* If the interface is learning, record the address. */ 2011 if (sbif->bif_flags & IFBIF_LEARNING) { 2012 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2013 sbif, 0, IFBAF_DYNAMIC); 2014 /* 2015 * If the interface has addresses limits then deny any source 2016 * that is not in the cache. 2017 */ 2018 if (error && sbif->bif_addrmax) 2019 goto drop; 2020 } 2021 2022 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2023 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2024 goto drop; 2025 2026 /* 2027 * At this point, the port either doesn't participate 2028 * in spanning tree or it is in the forwarding state. 2029 */ 2030 2031 /* 2032 * If the packet is unicast, destined for someone on 2033 * "this" side of the bridge, drop it. 2034 */ 2035 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2036 dst_if = bridge_rtlookup(sc, dst, vlan); 2037 if (src_if == dst_if) 2038 goto drop; 2039 } else { 2040 /* 2041 * Check if its a reserved multicast address, any address 2042 * listed in 802.1D section 7.12.6 may not be forwarded by the 2043 * bridge. 2044 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2045 */ 2046 if (dst[0] == 0x01 && dst[1] == 0x80 && 2047 dst[2] == 0xc2 && dst[3] == 0x00 && 2048 dst[4] == 0x00 && dst[5] <= 0x0f) 2049 goto drop; 2050 2051 /* ...forward it to all interfaces. */ 2052 ifp->if_imcasts++; 2053 dst_if = NULL; 2054 } 2055 2056 /* 2057 * If we have a destination interface which is a member of our bridge, 2058 * OR this is a unicast packet, push it through the bpf(4) machinery. 2059 * For broadcast or multicast packets, don't bother because it will 2060 * be reinjected into ether_input. We do this before we pass the packets 2061 * through the pfil(9) framework, as it is possible that pfil(9) will 2062 * drop the packet, or possibly modify it, making it difficult to debug 2063 * firewall issues on the bridge. 2064 */ 2065 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2066 ETHER_BPF_MTAP(ifp, m); 2067 2068 /* run the packet filter */ 2069 if (PFIL_HOOKED(&inet_pfil_hook) 2070 #ifdef INET6 2071 || PFIL_HOOKED(&inet6_pfil_hook) 2072 #endif 2073 ) { 2074 BRIDGE_UNLOCK(sc); 2075 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2076 return; 2077 if (m == NULL) 2078 return; 2079 BRIDGE_LOCK(sc); 2080 } 2081 2082 if (dst_if == NULL) { 2083 bridge_broadcast(sc, src_if, m, 1); 2084 return; 2085 } 2086 2087 /* 2088 * At this point, we're dealing with a unicast frame 2089 * going to a different interface. 2090 */ 2091 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2092 goto drop; 2093 2094 dbif = bridge_lookup_member_if(sc, dst_if); 2095 if (dbif == NULL) 2096 /* Not a member of the bridge (anymore?) */ 2097 goto drop; 2098 2099 /* Private segments can not talk to each other */ 2100 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2101 goto drop; 2102 2103 if ((dbif->bif_flags & IFBIF_STP) && 2104 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2105 goto drop; 2106 2107 BRIDGE_UNLOCK(sc); 2108 2109 if (PFIL_HOOKED(&inet_pfil_hook) 2110 #ifdef INET6 2111 || PFIL_HOOKED(&inet6_pfil_hook) 2112 #endif 2113 ) { 2114 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2115 return; 2116 if (m == NULL) 2117 return; 2118 } 2119 2120 bridge_enqueue(sc, dst_if, m); 2121 return; 2122 2123 drop: 2124 BRIDGE_UNLOCK(sc); 2125 m_freem(m); 2126 } 2127 2128 /* 2129 * bridge_input: 2130 * 2131 * Receive input from a member interface. Queue the packet for 2132 * bridging if it is not for us. 2133 */ 2134 static struct mbuf * 2135 bridge_input(struct ifnet *ifp, struct mbuf *m) 2136 { 2137 struct bridge_softc *sc = ifp->if_bridge; 2138 struct bridge_iflist *bif, *bif2; 2139 struct ifnet *bifp; 2140 struct ether_header *eh; 2141 struct mbuf *mc, *mc2; 2142 uint16_t vlan; 2143 int error; 2144 2145 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2146 return (m); 2147 2148 bifp = sc->sc_ifp; 2149 vlan = VLANTAGOF(m); 2150 2151 /* 2152 * Implement support for bridge monitoring. If this flag has been 2153 * set on this interface, discard the packet once we push it through 2154 * the bpf(4) machinery, but before we do, increment the byte and 2155 * packet counters associated with this interface. 2156 */ 2157 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2158 m->m_pkthdr.rcvif = bifp; 2159 ETHER_BPF_MTAP(bifp, m); 2160 bifp->if_ipackets++; 2161 bifp->if_ibytes += m->m_pkthdr.len; 2162 m_freem(m); 2163 return (NULL); 2164 } 2165 BRIDGE_LOCK(sc); 2166 bif = bridge_lookup_member_if(sc, ifp); 2167 if (bif == NULL) { 2168 BRIDGE_UNLOCK(sc); 2169 return (m); 2170 } 2171 2172 eh = mtod(m, struct ether_header *); 2173 2174 bridge_span(sc, m); 2175 2176 if (m->m_flags & (M_BCAST|M_MCAST)) { 2177 /* Tap off 802.1D packets; they do not get forwarded. */ 2178 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2179 ETHER_ADDR_LEN) == 0) { 2180 m = bstp_input(&bif->bif_stp, ifp, m); 2181 if (m == NULL) { 2182 BRIDGE_UNLOCK(sc); 2183 return (NULL); 2184 } 2185 } 2186 2187 if ((bif->bif_flags & IFBIF_STP) && 2188 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2189 BRIDGE_UNLOCK(sc); 2190 return (m); 2191 } 2192 2193 /* 2194 * Make a deep copy of the packet and enqueue the copy 2195 * for bridge processing; return the original packet for 2196 * local processing. 2197 */ 2198 mc = m_dup(m, M_DONTWAIT); 2199 if (mc == NULL) { 2200 BRIDGE_UNLOCK(sc); 2201 return (m); 2202 } 2203 2204 /* Perform the bridge forwarding function with the copy. */ 2205 bridge_forward(sc, bif, mc); 2206 2207 /* 2208 * Reinject the mbuf as arriving on the bridge so we have a 2209 * chance at claiming multicast packets. We can not loop back 2210 * here from ether_input as a bridge is never a member of a 2211 * bridge. 2212 */ 2213 KASSERT(bifp->if_bridge == NULL, 2214 ("loop created in bridge_input")); 2215 mc2 = m_dup(m, M_DONTWAIT); 2216 if (mc2 != NULL) { 2217 /* Keep the layer3 header aligned */ 2218 int i = min(mc2->m_pkthdr.len, max_protohdr); 2219 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2220 } 2221 if (mc2 != NULL) { 2222 mc2->m_pkthdr.rcvif = bifp; 2223 (*bifp->if_input)(bifp, mc2); 2224 } 2225 2226 /* Return the original packet for local processing. */ 2227 return (m); 2228 } 2229 2230 if ((bif->bif_flags & IFBIF_STP) && 2231 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2232 BRIDGE_UNLOCK(sc); 2233 return (m); 2234 } 2235 2236 #ifdef DEV_CARP 2237 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2238 || ((iface)->if_carp \ 2239 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2240 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2241 || ((iface)->if_carp \ 2242 && carp_forus((iface)->if_carp, eh->ether_shost)) 2243 #else 2244 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2245 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2246 #endif 2247 2248 #ifdef INET6 2249 # define OR_PFIL_HOOKED_INET6 \ 2250 || PFIL_HOOKED(&inet6_pfil_hook) 2251 #else 2252 # define OR_PFIL_HOOKED_INET6 2253 #endif 2254 2255 #define GRAB_OUR_PACKETS(iface) \ 2256 if ((iface)->if_type == IFT_GIF) \ 2257 continue; \ 2258 /* It is destined for us. */ \ 2259 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2260 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2261 ) { \ 2262 if ((iface)->if_type == IFT_BRIDGE) { \ 2263 ETHER_BPF_MTAP(iface, m); \ 2264 iface->if_ipackets++; \ 2265 /* Filter on the physical interface. */ \ 2266 if (pfil_local_phys && \ 2267 (PFIL_HOOKED(&inet_pfil_hook) \ 2268 OR_PFIL_HOOKED_INET6)) { \ 2269 if (bridge_pfil(&m, NULL, ifp, \ 2270 PFIL_IN) != 0 || m == NULL) { \ 2271 BRIDGE_UNLOCK(sc); \ 2272 return (NULL); \ 2273 } \ 2274 } \ 2275 } \ 2276 if (bif->bif_flags & IFBIF_LEARNING) { \ 2277 error = bridge_rtupdate(sc, eh->ether_shost, \ 2278 vlan, bif, 0, IFBAF_DYNAMIC); \ 2279 if (error && bif->bif_addrmax) { \ 2280 BRIDGE_UNLOCK(sc); \ 2281 m_freem(m); \ 2282 return (NULL); \ 2283 } \ 2284 } \ 2285 m->m_pkthdr.rcvif = iface; \ 2286 BRIDGE_UNLOCK(sc); \ 2287 return (m); \ 2288 } \ 2289 \ 2290 /* We just received a packet that we sent out. */ \ 2291 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2292 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2293 ) { \ 2294 BRIDGE_UNLOCK(sc); \ 2295 m_freem(m); \ 2296 return (NULL); \ 2297 } 2298 2299 /* 2300 * Unicast. Make sure it's not for the bridge. 2301 */ 2302 do { GRAB_OUR_PACKETS(bifp) } while (0); 2303 2304 /* 2305 * Give a chance for ifp at first priority. This will help when the 2306 * packet comes through the interface like VLAN's with the same MACs 2307 * on several interfaces from the same bridge. This also will save 2308 * some CPU cycles in case the destination interface and the input 2309 * interface (eq ifp) are the same. 2310 */ 2311 do { GRAB_OUR_PACKETS(ifp) } while (0); 2312 2313 /* Now check the all bridge members. */ 2314 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2315 GRAB_OUR_PACKETS(bif2->bif_ifp) 2316 } 2317 2318 #undef OR_CARP_CHECK_WE_ARE_DST 2319 #undef OR_CARP_CHECK_WE_ARE_SRC 2320 #undef OR_PFIL_HOOKED_INET6 2321 #undef GRAB_OUR_PACKETS 2322 2323 /* Perform the bridge forwarding function. */ 2324 bridge_forward(sc, bif, m); 2325 2326 return (NULL); 2327 } 2328 2329 /* 2330 * bridge_broadcast: 2331 * 2332 * Send a frame to all interfaces that are members of 2333 * the bridge, except for the one on which the packet 2334 * arrived. 2335 * 2336 * NOTE: Releases the lock on return. 2337 */ 2338 static void 2339 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2340 struct mbuf *m, int runfilt) 2341 { 2342 struct bridge_iflist *dbif, *sbif; 2343 struct mbuf *mc; 2344 struct ifnet *dst_if; 2345 int error = 0, used = 0, i; 2346 2347 sbif = bridge_lookup_member_if(sc, src_if); 2348 2349 BRIDGE_LOCK2REF(sc, error); 2350 if (error) { 2351 m_freem(m); 2352 return; 2353 } 2354 2355 /* Filter on the bridge interface before broadcasting */ 2356 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2357 #ifdef INET6 2358 || PFIL_HOOKED(&inet6_pfil_hook) 2359 #endif 2360 )) { 2361 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2362 goto out; 2363 if (m == NULL) 2364 goto out; 2365 } 2366 2367 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2368 dst_if = dbif->bif_ifp; 2369 if (dst_if == src_if) 2370 continue; 2371 2372 /* Private segments can not talk to each other */ 2373 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2374 continue; 2375 2376 if ((dbif->bif_flags & IFBIF_STP) && 2377 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2378 continue; 2379 2380 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2381 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2382 continue; 2383 2384 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2385 continue; 2386 2387 if (LIST_NEXT(dbif, bif_next) == NULL) { 2388 mc = m; 2389 used = 1; 2390 } else { 2391 mc = m_dup(m, M_DONTWAIT); 2392 if (mc == NULL) { 2393 sc->sc_ifp->if_oerrors++; 2394 continue; 2395 } 2396 } 2397 2398 /* 2399 * Filter on the output interface. Pass a NULL bridge interface 2400 * pointer so we do not redundantly filter on the bridge for 2401 * each interface we broadcast on. 2402 */ 2403 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2404 #ifdef INET6 2405 || PFIL_HOOKED(&inet6_pfil_hook) 2406 #endif 2407 )) { 2408 if (used == 0) { 2409 /* Keep the layer3 header aligned */ 2410 i = min(mc->m_pkthdr.len, max_protohdr); 2411 mc = m_copyup(mc, i, ETHER_ALIGN); 2412 if (mc == NULL) { 2413 sc->sc_ifp->if_oerrors++; 2414 continue; 2415 } 2416 } 2417 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2418 continue; 2419 if (mc == NULL) 2420 continue; 2421 } 2422 2423 bridge_enqueue(sc, dst_if, mc); 2424 } 2425 if (used == 0) 2426 m_freem(m); 2427 2428 out: 2429 BRIDGE_UNREF(sc); 2430 } 2431 2432 /* 2433 * bridge_span: 2434 * 2435 * Duplicate a packet out one or more interfaces that are in span mode, 2436 * the original mbuf is unmodified. 2437 */ 2438 static void 2439 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2440 { 2441 struct bridge_iflist *bif; 2442 struct ifnet *dst_if; 2443 struct mbuf *mc; 2444 2445 if (LIST_EMPTY(&sc->sc_spanlist)) 2446 return; 2447 2448 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2449 dst_if = bif->bif_ifp; 2450 2451 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2452 continue; 2453 2454 mc = m_copypacket(m, M_DONTWAIT); 2455 if (mc == NULL) { 2456 sc->sc_ifp->if_oerrors++; 2457 continue; 2458 } 2459 2460 bridge_enqueue(sc, dst_if, mc); 2461 } 2462 } 2463 2464 /* 2465 * bridge_rtupdate: 2466 * 2467 * Add a bridge routing entry. 2468 */ 2469 static int 2470 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2471 struct bridge_iflist *bif, int setflags, uint8_t flags) 2472 { 2473 struct bridge_rtnode *brt; 2474 int error; 2475 2476 BRIDGE_LOCK_ASSERT(sc); 2477 2478 /* Check the source address is valid and not multicast. */ 2479 if (ETHER_IS_MULTICAST(dst) || 2480 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2481 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2482 return (EINVAL); 2483 2484 /* 802.1p frames map to vlan 1 */ 2485 if (vlan == 0) 2486 vlan = 1; 2487 2488 /* 2489 * A route for this destination might already exist. If so, 2490 * update it, otherwise create a new one. 2491 */ 2492 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2493 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2494 sc->sc_brtexceeded++; 2495 return (ENOSPC); 2496 } 2497 /* Check per interface address limits (if enabled) */ 2498 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2499 bif->bif_addrexceeded++; 2500 return (ENOSPC); 2501 } 2502 2503 /* 2504 * Allocate a new bridge forwarding node, and 2505 * initialize the expiration time and Ethernet 2506 * address. 2507 */ 2508 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2509 if (brt == NULL) 2510 return (ENOMEM); 2511 2512 if (bif->bif_flags & IFBIF_STICKY) 2513 brt->brt_flags = IFBAF_STICKY; 2514 else 2515 brt->brt_flags = IFBAF_DYNAMIC; 2516 2517 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2518 brt->brt_vlan = vlan; 2519 2520 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2521 uma_zfree(bridge_rtnode_zone, brt); 2522 return (error); 2523 } 2524 brt->brt_dst = bif; 2525 bif->bif_addrcnt++; 2526 } 2527 2528 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2529 brt->brt_dst != bif) { 2530 brt->brt_dst->bif_addrcnt--; 2531 brt->brt_dst = bif; 2532 brt->brt_dst->bif_addrcnt++; 2533 } 2534 2535 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2536 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2537 if (setflags) 2538 brt->brt_flags = flags; 2539 2540 return (0); 2541 } 2542 2543 /* 2544 * bridge_rtlookup: 2545 * 2546 * Lookup the destination interface for an address. 2547 */ 2548 static struct ifnet * 2549 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2550 { 2551 struct bridge_rtnode *brt; 2552 2553 BRIDGE_LOCK_ASSERT(sc); 2554 2555 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2556 return (NULL); 2557 2558 return (brt->brt_ifp); 2559 } 2560 2561 /* 2562 * bridge_rttrim: 2563 * 2564 * Trim the routine table so that we have a number 2565 * of routing entries less than or equal to the 2566 * maximum number. 2567 */ 2568 static void 2569 bridge_rttrim(struct bridge_softc *sc) 2570 { 2571 struct bridge_rtnode *brt, *nbrt; 2572 2573 BRIDGE_LOCK_ASSERT(sc); 2574 2575 /* Make sure we actually need to do this. */ 2576 if (sc->sc_brtcnt <= sc->sc_brtmax) 2577 return; 2578 2579 /* Force an aging cycle; this might trim enough addresses. */ 2580 bridge_rtage(sc); 2581 if (sc->sc_brtcnt <= sc->sc_brtmax) 2582 return; 2583 2584 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2585 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2586 bridge_rtnode_destroy(sc, brt); 2587 if (sc->sc_brtcnt <= sc->sc_brtmax) 2588 return; 2589 } 2590 } 2591 } 2592 2593 /* 2594 * bridge_timer: 2595 * 2596 * Aging timer for the bridge. 2597 */ 2598 static void 2599 bridge_timer(void *arg) 2600 { 2601 struct bridge_softc *sc = arg; 2602 2603 BRIDGE_LOCK_ASSERT(sc); 2604 2605 bridge_rtage(sc); 2606 2607 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2608 callout_reset(&sc->sc_brcallout, 2609 bridge_rtable_prune_period * hz, bridge_timer, sc); 2610 } 2611 2612 /* 2613 * bridge_rtage: 2614 * 2615 * Perform an aging cycle. 2616 */ 2617 static void 2618 bridge_rtage(struct bridge_softc *sc) 2619 { 2620 struct bridge_rtnode *brt, *nbrt; 2621 2622 BRIDGE_LOCK_ASSERT(sc); 2623 2624 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2625 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2626 if (time_uptime >= brt->brt_expire) 2627 bridge_rtnode_destroy(sc, brt); 2628 } 2629 } 2630 } 2631 2632 /* 2633 * bridge_rtflush: 2634 * 2635 * Remove all dynamic addresses from the bridge. 2636 */ 2637 static void 2638 bridge_rtflush(struct bridge_softc *sc, int full) 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 (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2646 bridge_rtnode_destroy(sc, brt); 2647 } 2648 } 2649 2650 /* 2651 * bridge_rtdaddr: 2652 * 2653 * Remove an address from the table. 2654 */ 2655 static int 2656 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2657 { 2658 struct bridge_rtnode *brt; 2659 int found = 0; 2660 2661 BRIDGE_LOCK_ASSERT(sc); 2662 2663 /* 2664 * If vlan is zero then we want to delete for all vlans so the lookup 2665 * may return more than one. 2666 */ 2667 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2668 bridge_rtnode_destroy(sc, brt); 2669 found = 1; 2670 } 2671 2672 return (found ? 0 : ENOENT); 2673 } 2674 2675 /* 2676 * bridge_rtdelete: 2677 * 2678 * Delete routes to a speicifc member interface. 2679 */ 2680 static void 2681 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2682 { 2683 struct bridge_rtnode *brt, *nbrt; 2684 2685 BRIDGE_LOCK_ASSERT(sc); 2686 2687 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2688 if (brt->brt_ifp == ifp && (full || 2689 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2690 bridge_rtnode_destroy(sc, brt); 2691 } 2692 } 2693 2694 /* 2695 * bridge_rtable_init: 2696 * 2697 * Initialize the route table for this bridge. 2698 */ 2699 static int 2700 bridge_rtable_init(struct bridge_softc *sc) 2701 { 2702 int i; 2703 2704 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2705 M_DEVBUF, M_NOWAIT); 2706 if (sc->sc_rthash == NULL) 2707 return (ENOMEM); 2708 2709 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2710 LIST_INIT(&sc->sc_rthash[i]); 2711 2712 sc->sc_rthash_key = arc4random(); 2713 2714 LIST_INIT(&sc->sc_rtlist); 2715 2716 return (0); 2717 } 2718 2719 /* 2720 * bridge_rtable_fini: 2721 * 2722 * Deconstruct the route table for this bridge. 2723 */ 2724 static void 2725 bridge_rtable_fini(struct bridge_softc *sc) 2726 { 2727 2728 KASSERT(sc->sc_brtcnt == 0, 2729 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2730 free(sc->sc_rthash, M_DEVBUF); 2731 } 2732 2733 /* 2734 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2735 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2736 */ 2737 #define mix(a, b, c) \ 2738 do { \ 2739 a -= b; a -= c; a ^= (c >> 13); \ 2740 b -= c; b -= a; b ^= (a << 8); \ 2741 c -= a; c -= b; c ^= (b >> 13); \ 2742 a -= b; a -= c; a ^= (c >> 12); \ 2743 b -= c; b -= a; b ^= (a << 16); \ 2744 c -= a; c -= b; c ^= (b >> 5); \ 2745 a -= b; a -= c; a ^= (c >> 3); \ 2746 b -= c; b -= a; b ^= (a << 10); \ 2747 c -= a; c -= b; c ^= (b >> 15); \ 2748 } while (/*CONSTCOND*/0) 2749 2750 static __inline uint32_t 2751 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2752 { 2753 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2754 2755 b += addr[5] << 8; 2756 b += addr[4]; 2757 a += addr[3] << 24; 2758 a += addr[2] << 16; 2759 a += addr[1] << 8; 2760 a += addr[0]; 2761 2762 mix(a, b, c); 2763 2764 return (c & BRIDGE_RTHASH_MASK); 2765 } 2766 2767 #undef mix 2768 2769 static int 2770 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2771 { 2772 int i, d; 2773 2774 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2775 d = ((int)a[i]) - ((int)b[i]); 2776 } 2777 2778 return (d); 2779 } 2780 2781 /* 2782 * bridge_rtnode_lookup: 2783 * 2784 * Look up a bridge route node for the specified destination. Compare the 2785 * vlan id or if zero then just return the first match. 2786 */ 2787 static struct bridge_rtnode * 2788 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2789 { 2790 struct bridge_rtnode *brt; 2791 uint32_t hash; 2792 int dir; 2793 2794 BRIDGE_LOCK_ASSERT(sc); 2795 2796 hash = bridge_rthash(sc, addr); 2797 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2798 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2799 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2800 return (brt); 2801 if (dir > 0) 2802 return (NULL); 2803 } 2804 2805 return (NULL); 2806 } 2807 2808 /* 2809 * bridge_rtnode_insert: 2810 * 2811 * Insert the specified bridge node into the route table. We 2812 * assume the entry is not already in the table. 2813 */ 2814 static int 2815 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2816 { 2817 struct bridge_rtnode *lbrt; 2818 uint32_t hash; 2819 int dir; 2820 2821 BRIDGE_LOCK_ASSERT(sc); 2822 2823 hash = bridge_rthash(sc, brt->brt_addr); 2824 2825 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2826 if (lbrt == NULL) { 2827 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2828 goto out; 2829 } 2830 2831 do { 2832 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2833 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2834 return (EEXIST); 2835 if (dir > 0) { 2836 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2837 goto out; 2838 } 2839 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2840 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2841 goto out; 2842 } 2843 lbrt = LIST_NEXT(lbrt, brt_hash); 2844 } while (lbrt != NULL); 2845 2846 #ifdef DIAGNOSTIC 2847 panic("bridge_rtnode_insert: impossible"); 2848 #endif 2849 2850 out: 2851 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2852 sc->sc_brtcnt++; 2853 2854 return (0); 2855 } 2856 2857 /* 2858 * bridge_rtnode_destroy: 2859 * 2860 * Destroy a bridge rtnode. 2861 */ 2862 static void 2863 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2864 { 2865 BRIDGE_LOCK_ASSERT(sc); 2866 2867 LIST_REMOVE(brt, brt_hash); 2868 2869 LIST_REMOVE(brt, brt_list); 2870 sc->sc_brtcnt--; 2871 brt->brt_dst->bif_addrcnt--; 2872 uma_zfree(bridge_rtnode_zone, brt); 2873 } 2874 2875 /* 2876 * bridge_rtable_expire: 2877 * 2878 * Set the expiry time for all routes on an interface. 2879 */ 2880 static void 2881 bridge_rtable_expire(struct ifnet *ifp, int age) 2882 { 2883 struct bridge_softc *sc = ifp->if_bridge; 2884 struct bridge_rtnode *brt; 2885 2886 BRIDGE_LOCK(sc); 2887 2888 /* 2889 * If the age is zero then flush, otherwise set all the expiry times to 2890 * age for the interface 2891 */ 2892 if (age == 0) 2893 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2894 else { 2895 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2896 /* Cap the expiry time to 'age' */ 2897 if (brt->brt_ifp == ifp && 2898 brt->brt_expire > time_uptime + age && 2899 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2900 brt->brt_expire = time_uptime + age; 2901 } 2902 } 2903 BRIDGE_UNLOCK(sc); 2904 } 2905 2906 /* 2907 * bridge_state_change: 2908 * 2909 * Callback from the bridgestp code when a port changes states. 2910 */ 2911 static void 2912 bridge_state_change(struct ifnet *ifp, int state) 2913 { 2914 struct bridge_softc *sc = ifp->if_bridge; 2915 static const char *stpstates[] = { 2916 "disabled", 2917 "listening", 2918 "learning", 2919 "forwarding", 2920 "blocking", 2921 "discarding" 2922 }; 2923 2924 if (log_stp) 2925 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2926 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2927 } 2928 2929 /* 2930 * Send bridge packets through pfil if they are one of the types pfil can deal 2931 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2932 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2933 * that interface. 2934 */ 2935 static int 2936 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2937 { 2938 int snap, error, i, hlen; 2939 struct ether_header *eh1, eh2; 2940 struct ip_fw_args args; 2941 struct ip *ip; 2942 struct llc llc1; 2943 u_int16_t ether_type; 2944 2945 snap = 0; 2946 error = -1; /* Default error if not error == 0 */ 2947 2948 #if 0 2949 /* we may return with the IP fields swapped, ensure its not shared */ 2950 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2951 #endif 2952 2953 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2954 return (0); /* filtering is disabled */ 2955 2956 i = min((*mp)->m_pkthdr.len, max_protohdr); 2957 if ((*mp)->m_len < i) { 2958 *mp = m_pullup(*mp, i); 2959 if (*mp == NULL) { 2960 printf("%s: m_pullup failed\n", __func__); 2961 return (-1); 2962 } 2963 } 2964 2965 eh1 = mtod(*mp, struct ether_header *); 2966 ether_type = ntohs(eh1->ether_type); 2967 2968 /* 2969 * Check for SNAP/LLC. 2970 */ 2971 if (ether_type < ETHERMTU) { 2972 struct llc *llc2 = (struct llc *)(eh1 + 1); 2973 2974 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2975 llc2->llc_dsap == LLC_SNAP_LSAP && 2976 llc2->llc_ssap == LLC_SNAP_LSAP && 2977 llc2->llc_control == LLC_UI) { 2978 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2979 snap = 1; 2980 } 2981 } 2982 2983 /* 2984 * If we're trying to filter bridge traffic, don't look at anything 2985 * other than IP and ARP traffic. If the filter doesn't understand 2986 * IPv6, don't allow IPv6 through the bridge either. This is lame 2987 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2988 * but of course we don't have an AppleTalk filter to begin with. 2989 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2990 * ARP traffic.) 2991 */ 2992 switch (ether_type) { 2993 case ETHERTYPE_ARP: 2994 case ETHERTYPE_REVARP: 2995 if (pfil_ipfw_arp == 0) 2996 return (0); /* Automatically pass */ 2997 break; 2998 2999 case ETHERTYPE_IP: 3000 #ifdef INET6 3001 case ETHERTYPE_IPV6: 3002 #endif /* INET6 */ 3003 break; 3004 default: 3005 /* 3006 * Check to see if the user wants to pass non-ip 3007 * packets, these will not be checked by pfil(9) and 3008 * passed unconditionally so the default is to drop. 3009 */ 3010 if (pfil_onlyip) 3011 goto bad; 3012 } 3013 3014 /* Strip off the Ethernet header and keep a copy. */ 3015 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3016 m_adj(*mp, ETHER_HDR_LEN); 3017 3018 /* Strip off snap header, if present */ 3019 if (snap) { 3020 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3021 m_adj(*mp, sizeof(struct llc)); 3022 } 3023 3024 /* 3025 * Check the IP header for alignment and errors 3026 */ 3027 if (dir == PFIL_IN) { 3028 switch (ether_type) { 3029 case ETHERTYPE_IP: 3030 error = bridge_ip_checkbasic(mp); 3031 break; 3032 #ifdef INET6 3033 case ETHERTYPE_IPV6: 3034 error = bridge_ip6_checkbasic(mp); 3035 break; 3036 #endif /* INET6 */ 3037 default: 3038 error = 0; 3039 } 3040 if (error) 3041 goto bad; 3042 } 3043 3044 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3045 INIT_VNET_INET(curvnet); 3046 3047 error = -1; 3048 args.rule = ip_dn_claim_rule(*mp); 3049 if (args.rule != NULL && V_fw_one_pass) 3050 goto ipfwpass; /* packet already partially processed */ 3051 3052 args.m = *mp; 3053 args.oif = ifp; 3054 args.next_hop = NULL; 3055 args.eh = &eh2; 3056 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3057 i = ip_fw_chk_ptr(&args); 3058 *mp = args.m; 3059 3060 if (*mp == NULL) 3061 return (error); 3062 3063 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 3064 3065 /* put the Ethernet header back on */ 3066 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3067 if (*mp == NULL) 3068 return (error); 3069 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3070 3071 /* 3072 * Pass the pkt to dummynet, which consumes it. The 3073 * packet will return to us via bridge_dummynet(). 3074 */ 3075 args.oif = ifp; 3076 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3077 return (error); 3078 } 3079 3080 if (i != IP_FW_PASS) /* drop */ 3081 goto bad; 3082 } 3083 3084 ipfwpass: 3085 error = 0; 3086 3087 /* 3088 * Run the packet through pfil 3089 */ 3090 switch (ether_type) { 3091 case ETHERTYPE_IP: 3092 /* 3093 * before calling the firewall, swap fields the same as 3094 * IP does. here we assume the header is contiguous 3095 */ 3096 ip = mtod(*mp, struct ip *); 3097 3098 ip->ip_len = ntohs(ip->ip_len); 3099 ip->ip_off = ntohs(ip->ip_off); 3100 3101 /* 3102 * Run pfil on the member interface and the bridge, both can 3103 * be skipped by clearing pfil_member or pfil_bridge. 3104 * 3105 * Keep the order: 3106 * in_if -> bridge_if -> out_if 3107 */ 3108 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3109 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3110 dir, NULL); 3111 3112 if (*mp == NULL || error != 0) /* filter may consume */ 3113 break; 3114 3115 if (pfil_member && ifp != NULL) 3116 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3117 dir, NULL); 3118 3119 if (*mp == NULL || error != 0) /* filter may consume */ 3120 break; 3121 3122 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3123 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3124 dir, NULL); 3125 3126 if (*mp == NULL || error != 0) /* filter may consume */ 3127 break; 3128 3129 /* check if we need to fragment the packet */ 3130 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3131 i = (*mp)->m_pkthdr.len; 3132 if (i > ifp->if_mtu) { 3133 error = bridge_fragment(ifp, *mp, &eh2, snap, 3134 &llc1); 3135 return (error); 3136 } 3137 } 3138 3139 /* Recalculate the ip checksum and restore byte ordering */ 3140 ip = mtod(*mp, struct ip *); 3141 hlen = ip->ip_hl << 2; 3142 if (hlen < sizeof(struct ip)) 3143 goto bad; 3144 if (hlen > (*mp)->m_len) { 3145 if ((*mp = m_pullup(*mp, hlen)) == 0) 3146 goto bad; 3147 ip = mtod(*mp, struct ip *); 3148 if (ip == NULL) 3149 goto bad; 3150 } 3151 ip->ip_len = htons(ip->ip_len); 3152 ip->ip_off = htons(ip->ip_off); 3153 ip->ip_sum = 0; 3154 if (hlen == sizeof(struct ip)) 3155 ip->ip_sum = in_cksum_hdr(ip); 3156 else 3157 ip->ip_sum = in_cksum(*mp, hlen); 3158 3159 break; 3160 #ifdef INET6 3161 case ETHERTYPE_IPV6: 3162 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3163 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3164 dir, NULL); 3165 3166 if (*mp == NULL || error != 0) /* filter may consume */ 3167 break; 3168 3169 if (pfil_member && ifp != NULL) 3170 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3171 dir, NULL); 3172 3173 if (*mp == NULL || error != 0) /* filter may consume */ 3174 break; 3175 3176 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3177 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3178 dir, NULL); 3179 break; 3180 #endif 3181 default: 3182 error = 0; 3183 break; 3184 } 3185 3186 if (*mp == NULL) 3187 return (error); 3188 if (error != 0) 3189 goto bad; 3190 3191 error = -1; 3192 3193 /* 3194 * Finally, put everything back the way it was and return 3195 */ 3196 if (snap) { 3197 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3198 if (*mp == NULL) 3199 return (error); 3200 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3201 } 3202 3203 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3204 if (*mp == NULL) 3205 return (error); 3206 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3207 3208 return (0); 3209 3210 bad: 3211 m_freem(*mp); 3212 *mp = NULL; 3213 return (error); 3214 } 3215 3216 /* 3217 * Perform basic checks on header size since 3218 * pfil assumes ip_input has already processed 3219 * it for it. Cut-and-pasted from ip_input.c. 3220 * Given how simple the IPv6 version is, 3221 * does the IPv4 version really need to be 3222 * this complicated? 3223 * 3224 * XXX Should we update ipstat here, or not? 3225 * XXX Right now we update ipstat but not 3226 * XXX csum_counter. 3227 */ 3228 static int 3229 bridge_ip_checkbasic(struct mbuf **mp) 3230 { 3231 INIT_VNET_INET(curvnet); 3232 struct mbuf *m = *mp; 3233 struct ip *ip; 3234 int len, hlen; 3235 u_short sum; 3236 3237 if (*mp == NULL) 3238 return (-1); 3239 3240 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3241 if ((m = m_copyup(m, sizeof(struct ip), 3242 (max_linkhdr + 3) & ~3)) == NULL) { 3243 /* XXXJRT new stat, please */ 3244 V_ipstat.ips_toosmall++; 3245 goto bad; 3246 } 3247 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3248 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3249 V_ipstat.ips_toosmall++; 3250 goto bad; 3251 } 3252 } 3253 ip = mtod(m, struct ip *); 3254 if (ip == NULL) goto bad; 3255 3256 if (ip->ip_v != IPVERSION) { 3257 V_ipstat.ips_badvers++; 3258 goto bad; 3259 } 3260 hlen = ip->ip_hl << 2; 3261 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3262 V_ipstat.ips_badhlen++; 3263 goto bad; 3264 } 3265 if (hlen > m->m_len) { 3266 if ((m = m_pullup(m, hlen)) == 0) { 3267 V_ipstat.ips_badhlen++; 3268 goto bad; 3269 } 3270 ip = mtod(m, struct ip *); 3271 if (ip == NULL) goto bad; 3272 } 3273 3274 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3275 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3276 } else { 3277 if (hlen == sizeof(struct ip)) { 3278 sum = in_cksum_hdr(ip); 3279 } else { 3280 sum = in_cksum(m, hlen); 3281 } 3282 } 3283 if (sum) { 3284 V_ipstat.ips_badsum++; 3285 goto bad; 3286 } 3287 3288 /* Retrieve the packet length. */ 3289 len = ntohs(ip->ip_len); 3290 3291 /* 3292 * Check for additional length bogosity 3293 */ 3294 if (len < hlen) { 3295 V_ipstat.ips_badlen++; 3296 goto bad; 3297 } 3298 3299 /* 3300 * Check that the amount of data in the buffers 3301 * is as at least much as the IP header would have us expect. 3302 * Drop packet if shorter than we expect. 3303 */ 3304 if (m->m_pkthdr.len < len) { 3305 V_ipstat.ips_tooshort++; 3306 goto bad; 3307 } 3308 3309 /* Checks out, proceed */ 3310 *mp = m; 3311 return (0); 3312 3313 bad: 3314 *mp = m; 3315 return (-1); 3316 } 3317 3318 #ifdef INET6 3319 /* 3320 * Same as above, but for IPv6. 3321 * Cut-and-pasted from ip6_input.c. 3322 * XXX Should we update ip6stat, or not? 3323 */ 3324 static int 3325 bridge_ip6_checkbasic(struct mbuf **mp) 3326 { 3327 INIT_VNET_INET6(curvnet); 3328 struct mbuf *m = *mp; 3329 struct ip6_hdr *ip6; 3330 3331 /* 3332 * If the IPv6 header is not aligned, slurp it up into a new 3333 * mbuf with space for link headers, in the event we forward 3334 * it. Otherwise, if it is aligned, make sure the entire base 3335 * IPv6 header is in the first mbuf of the chain. 3336 */ 3337 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3338 struct ifnet *inifp = m->m_pkthdr.rcvif; 3339 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3340 (max_linkhdr + 3) & ~3)) == NULL) { 3341 /* XXXJRT new stat, please */ 3342 V_ip6stat.ip6s_toosmall++; 3343 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3344 goto bad; 3345 } 3346 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3347 struct ifnet *inifp = m->m_pkthdr.rcvif; 3348 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3349 V_ip6stat.ip6s_toosmall++; 3350 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3351 goto bad; 3352 } 3353 } 3354 3355 ip6 = mtod(m, struct ip6_hdr *); 3356 3357 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3358 V_ip6stat.ip6s_badvers++; 3359 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3360 goto bad; 3361 } 3362 3363 /* Checks out, proceed */ 3364 *mp = m; 3365 return (0); 3366 3367 bad: 3368 *mp = m; 3369 return (-1); 3370 } 3371 #endif /* INET6 */ 3372 3373 /* 3374 * bridge_fragment: 3375 * 3376 * Return a fragmented mbuf chain. 3377 */ 3378 static int 3379 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3380 int snap, struct llc *llc) 3381 { 3382 INIT_VNET_INET(curvnet); 3383 struct mbuf *m0; 3384 struct ip *ip; 3385 int error = -1; 3386 3387 if (m->m_len < sizeof(struct ip) && 3388 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3389 goto out; 3390 ip = mtod(m, struct ip *); 3391 3392 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3393 CSUM_DELAY_IP); 3394 if (error) 3395 goto out; 3396 3397 /* walk the chain and re-add the Ethernet header */ 3398 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3399 if (error == 0) { 3400 if (snap) { 3401 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3402 if (m0 == NULL) { 3403 error = ENOBUFS; 3404 continue; 3405 } 3406 bcopy(llc, mtod(m0, caddr_t), 3407 sizeof(struct llc)); 3408 } 3409 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3410 if (m0 == NULL) { 3411 error = ENOBUFS; 3412 continue; 3413 } 3414 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3415 } else 3416 m_freem(m); 3417 } 3418 3419 if (error == 0) 3420 V_ipstat.ips_fragmented++; 3421 3422 return (error); 3423 3424 out: 3425 if (m != NULL) 3426 m_freem(m); 3427 return (error); 3428 } 3429