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 struct ifnet *sc_ifaddr; /* member mac copied from */ 224 u_char sc_defaddr[6]; /* Default MAC address */ 225 }; 226 227 static struct mtx bridge_list_mtx; 228 eventhandler_tag bridge_detach_cookie = NULL; 229 230 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 231 232 uma_zone_t bridge_rtnode_zone; 233 234 static int bridge_clone_create(struct if_clone *, int, caddr_t); 235 static void bridge_clone_destroy(struct ifnet *); 236 237 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 238 static void bridge_mutecaps(struct bridge_softc *); 239 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 240 int); 241 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 242 static void bridge_init(void *); 243 static void bridge_dummynet(struct mbuf *, struct ifnet *); 244 static void bridge_stop(struct ifnet *, int); 245 static void bridge_start(struct ifnet *); 246 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 247 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 248 struct rtentry *); 249 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 250 struct mbuf *); 251 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 252 253 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 254 struct mbuf *m); 255 256 static void bridge_timer(void *); 257 258 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 259 struct mbuf *, int); 260 static void bridge_span(struct bridge_softc *, struct mbuf *); 261 262 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 263 uint16_t, struct bridge_iflist *, int, uint8_t); 264 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 265 uint16_t); 266 static void bridge_rttrim(struct bridge_softc *); 267 static void bridge_rtage(struct bridge_softc *); 268 static void bridge_rtflush(struct bridge_softc *, int); 269 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 270 uint16_t); 271 272 static int bridge_rtable_init(struct bridge_softc *); 273 static void bridge_rtable_fini(struct bridge_softc *); 274 275 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 276 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 277 const uint8_t *, uint16_t); 278 static int bridge_rtnode_insert(struct bridge_softc *, 279 struct bridge_rtnode *); 280 static void bridge_rtnode_destroy(struct bridge_softc *, 281 struct bridge_rtnode *); 282 static void bridge_rtable_expire(struct ifnet *, int); 283 static void bridge_state_change(struct ifnet *, int); 284 285 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 286 const char *name); 287 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 288 struct ifnet *ifp); 289 static void bridge_delete_member(struct bridge_softc *, 290 struct bridge_iflist *, int); 291 static void bridge_delete_span(struct bridge_softc *, 292 struct bridge_iflist *); 293 294 static int bridge_ioctl_add(struct bridge_softc *, void *); 295 static int bridge_ioctl_del(struct bridge_softc *, void *); 296 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 297 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 298 static int bridge_ioctl_scache(struct bridge_softc *, void *); 299 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 300 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 301 static int bridge_ioctl_rts(struct bridge_softc *, void *); 302 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 303 static int bridge_ioctl_sto(struct bridge_softc *, void *); 304 static int bridge_ioctl_gto(struct bridge_softc *, void *); 305 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 306 static int bridge_ioctl_flush(struct bridge_softc *, void *); 307 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 308 static int bridge_ioctl_spri(struct bridge_softc *, void *); 309 static int bridge_ioctl_ght(struct bridge_softc *, void *); 310 static int bridge_ioctl_sht(struct bridge_softc *, void *); 311 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 312 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 313 static int bridge_ioctl_gma(struct bridge_softc *, void *); 314 static int bridge_ioctl_sma(struct bridge_softc *, void *); 315 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 316 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 318 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 319 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 320 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 321 static int bridge_ioctl_grte(struct bridge_softc *, void *); 322 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 323 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 324 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 325 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 326 int); 327 static int bridge_ip_checkbasic(struct mbuf **mp); 328 #ifdef INET6 329 static int bridge_ip6_checkbasic(struct mbuf **mp); 330 #endif /* INET6 */ 331 static int bridge_fragment(struct ifnet *, struct mbuf *, 332 struct ether_header *, int, struct llc *); 333 334 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 335 #define VLANTAGOF(_m) \ 336 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 337 338 static struct bstp_cb_ops bridge_ops = { 339 .bcb_state = bridge_state_change, 340 .bcb_rtage = bridge_rtable_expire 341 }; 342 343 SYSCTL_DECL(_net_link); 344 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 345 346 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 347 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 348 static int pfil_member = 1; /* run pfil hooks on the member interface */ 349 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 350 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 351 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 352 locally destined packets */ 353 static int log_stp = 0; /* log STP state changes */ 354 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 355 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 356 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 357 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 358 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 360 &pfil_bridge, 0, "Packet filter on the bridge interface"); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 362 &pfil_member, 0, "Packet filter on the member interface"); 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 364 &pfil_local_phys, 0, 365 "Packet filter on the physical interface for locally destined packets"); 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 367 &log_stp, 0, "Log STP state changes"); 368 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 369 &bridge_inherit_mac, 0, 370 "Inherit MAC address from the first bridge member"); 371 372 struct bridge_control { 373 int (*bc_func)(struct bridge_softc *, void *); 374 int bc_argsize; 375 int bc_flags; 376 }; 377 378 #define BC_F_COPYIN 0x01 /* copy arguments in */ 379 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 380 #define BC_F_SUSER 0x04 /* do super-user check */ 381 382 const struct bridge_control bridge_control_table[] = { 383 { bridge_ioctl_add, sizeof(struct ifbreq), 384 BC_F_COPYIN|BC_F_SUSER }, 385 { bridge_ioctl_del, sizeof(struct ifbreq), 386 BC_F_COPYIN|BC_F_SUSER }, 387 388 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 389 BC_F_COPYIN|BC_F_COPYOUT }, 390 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 391 BC_F_COPYIN|BC_F_SUSER }, 392 393 { bridge_ioctl_scache, sizeof(struct ifbrparam), 394 BC_F_COPYIN|BC_F_SUSER }, 395 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 396 BC_F_COPYOUT }, 397 398 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 399 BC_F_COPYIN|BC_F_COPYOUT }, 400 { bridge_ioctl_rts, sizeof(struct ifbaconf), 401 BC_F_COPYIN|BC_F_COPYOUT }, 402 403 { bridge_ioctl_saddr, sizeof(struct ifbareq), 404 BC_F_COPYIN|BC_F_SUSER }, 405 406 { bridge_ioctl_sto, sizeof(struct ifbrparam), 407 BC_F_COPYIN|BC_F_SUSER }, 408 { bridge_ioctl_gto, sizeof(struct ifbrparam), 409 BC_F_COPYOUT }, 410 411 { bridge_ioctl_daddr, sizeof(struct ifbareq), 412 BC_F_COPYIN|BC_F_SUSER }, 413 414 { bridge_ioctl_flush, sizeof(struct ifbreq), 415 BC_F_COPYIN|BC_F_SUSER }, 416 417 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 418 BC_F_COPYOUT }, 419 { bridge_ioctl_spri, sizeof(struct ifbrparam), 420 BC_F_COPYIN|BC_F_SUSER }, 421 422 { bridge_ioctl_ght, sizeof(struct ifbrparam), 423 BC_F_COPYOUT }, 424 { bridge_ioctl_sht, sizeof(struct ifbrparam), 425 BC_F_COPYIN|BC_F_SUSER }, 426 427 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 428 BC_F_COPYOUT }, 429 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 430 BC_F_COPYIN|BC_F_SUSER }, 431 432 { bridge_ioctl_gma, sizeof(struct ifbrparam), 433 BC_F_COPYOUT }, 434 { bridge_ioctl_sma, sizeof(struct ifbrparam), 435 BC_F_COPYIN|BC_F_SUSER }, 436 437 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 438 BC_F_COPYIN|BC_F_SUSER }, 439 440 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 441 BC_F_COPYIN|BC_F_SUSER }, 442 443 { bridge_ioctl_addspan, sizeof(struct ifbreq), 444 BC_F_COPYIN|BC_F_SUSER }, 445 { bridge_ioctl_delspan, sizeof(struct ifbreq), 446 BC_F_COPYIN|BC_F_SUSER }, 447 448 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 449 BC_F_COPYOUT }, 450 451 { bridge_ioctl_grte, sizeof(struct ifbrparam), 452 BC_F_COPYOUT }, 453 454 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 455 BC_F_COPYIN|BC_F_COPYOUT }, 456 457 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 461 BC_F_COPYIN|BC_F_SUSER }, 462 463 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 464 BC_F_COPYIN|BC_F_SUSER }, 465 466 }; 467 const int bridge_control_table_size = 468 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 469 470 LIST_HEAD(, bridge_softc) bridge_list; 471 472 IFC_SIMPLE_DECLARE(bridge, 0); 473 474 static int 475 bridge_modevent(module_t mod, int type, void *data) 476 { 477 478 switch (type) { 479 case MOD_LOAD: 480 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 481 if_clone_attach(&bridge_cloner); 482 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 483 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 484 UMA_ALIGN_PTR, 0); 485 LIST_INIT(&bridge_list); 486 bridge_input_p = bridge_input; 487 bridge_output_p = bridge_output; 488 bridge_dn_p = bridge_dummynet; 489 bridge_detach_cookie = EVENTHANDLER_REGISTER( 490 ifnet_departure_event, bridge_ifdetach, NULL, 491 EVENTHANDLER_PRI_ANY); 492 break; 493 case MOD_UNLOAD: 494 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 495 bridge_detach_cookie); 496 if_clone_detach(&bridge_cloner); 497 uma_zdestroy(bridge_rtnode_zone); 498 bridge_input_p = NULL; 499 bridge_output_p = NULL; 500 bridge_dn_p = NULL; 501 mtx_destroy(&bridge_list_mtx); 502 break; 503 default: 504 return (EOPNOTSUPP); 505 } 506 return (0); 507 } 508 509 static moduledata_t bridge_mod = { 510 "if_bridge", 511 bridge_modevent, 512 0 513 }; 514 515 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 516 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 517 518 /* 519 * handler for net.link.bridge.pfil_ipfw 520 */ 521 static int 522 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 523 { 524 int enable = pfil_ipfw; 525 int error; 526 527 error = sysctl_handle_int(oidp, &enable, 0, req); 528 enable = (enable) ? 1 : 0; 529 530 if (enable != pfil_ipfw) { 531 pfil_ipfw = enable; 532 533 /* 534 * Disable pfil so that ipfw doesnt run twice, if the user 535 * really wants both then they can re-enable pfil_bridge and/or 536 * pfil_member. Also allow non-ip packets as ipfw can filter by 537 * layer2 type. 538 */ 539 if (pfil_ipfw) { 540 pfil_onlyip = 0; 541 pfil_bridge = 0; 542 pfil_member = 0; 543 } 544 } 545 546 return (error); 547 } 548 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 549 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 550 551 /* 552 * bridge_clone_create: 553 * 554 * Create a new bridge instance. 555 */ 556 static int 557 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 558 { 559 struct bridge_softc *sc, *sc2; 560 struct ifnet *bifp, *ifp; 561 int retry; 562 563 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 564 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 565 if (ifp == NULL) { 566 free(sc, M_DEVBUF); 567 return (ENOSPC); 568 } 569 570 BRIDGE_LOCK_INIT(sc); 571 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 572 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 573 574 /* Initialize our routing table. */ 575 bridge_rtable_init(sc); 576 577 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 578 579 LIST_INIT(&sc->sc_iflist); 580 LIST_INIT(&sc->sc_spanlist); 581 582 ifp->if_softc = sc; 583 if_initname(ifp, ifc->ifc_name, unit); 584 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 585 ifp->if_ioctl = bridge_ioctl; 586 ifp->if_start = bridge_start; 587 ifp->if_init = bridge_init; 588 ifp->if_type = IFT_BRIDGE; 589 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 590 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 591 IFQ_SET_READY(&ifp->if_snd); 592 593 /* 594 * Generate a random ethernet address with a locally administered 595 * address. 596 * 597 * Since we are using random ethernet addresses for the bridge, it is 598 * possible that we might have address collisions, so make sure that 599 * this hardware address isn't already in use on another bridge. 600 */ 601 for (retry = 1; retry != 0;) { 602 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 603 sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ 604 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 605 retry = 0; 606 mtx_lock(&bridge_list_mtx); 607 LIST_FOREACH(sc2, &bridge_list, sc_list) { 608 bifp = sc2->sc_ifp; 609 if (memcmp(sc->sc_defaddr, 610 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 611 retry = 1; 612 } 613 mtx_unlock(&bridge_list_mtx); 614 } 615 616 bstp_attach(&sc->sc_stp, &bridge_ops); 617 ether_ifattach(ifp, sc->sc_defaddr); 618 /* Now undo some of the damage... */ 619 ifp->if_baudrate = 0; 620 ifp->if_type = IFT_BRIDGE; 621 622 mtx_lock(&bridge_list_mtx); 623 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 624 mtx_unlock(&bridge_list_mtx); 625 626 return (0); 627 } 628 629 /* 630 * bridge_clone_destroy: 631 * 632 * Destroy a bridge instance. 633 */ 634 static void 635 bridge_clone_destroy(struct ifnet *ifp) 636 { 637 struct bridge_softc *sc = ifp->if_softc; 638 struct bridge_iflist *bif; 639 640 BRIDGE_LOCK(sc); 641 642 bridge_stop(ifp, 1); 643 ifp->if_flags &= ~IFF_UP; 644 645 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 646 bridge_delete_member(sc, bif, 0); 647 648 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 649 bridge_delete_span(sc, bif); 650 } 651 652 BRIDGE_UNLOCK(sc); 653 654 callout_drain(&sc->sc_brcallout); 655 656 mtx_lock(&bridge_list_mtx); 657 LIST_REMOVE(sc, sc_list); 658 mtx_unlock(&bridge_list_mtx); 659 660 bstp_detach(&sc->sc_stp); 661 ether_ifdetach(ifp); 662 if_free_type(ifp, IFT_ETHER); 663 664 /* Tear down the routing table. */ 665 bridge_rtable_fini(sc); 666 667 BRIDGE_LOCK_DESTROY(sc); 668 free(sc, M_DEVBUF); 669 } 670 671 /* 672 * bridge_ioctl: 673 * 674 * Handle a control request from the operator. 675 */ 676 static int 677 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 678 { 679 struct bridge_softc *sc = ifp->if_softc; 680 struct thread *td = curthread; 681 union { 682 struct ifbreq ifbreq; 683 struct ifbifconf ifbifconf; 684 struct ifbareq ifbareq; 685 struct ifbaconf ifbaconf; 686 struct ifbrparam ifbrparam; 687 struct ifbropreq ifbropreq; 688 } args; 689 struct ifdrv *ifd = (struct ifdrv *) data; 690 const struct bridge_control *bc; 691 int error = 0; 692 693 switch (cmd) { 694 695 case SIOCADDMULTI: 696 case SIOCDELMULTI: 697 break; 698 699 case SIOCGDRVSPEC: 700 case SIOCSDRVSPEC: 701 if (ifd->ifd_cmd >= bridge_control_table_size) { 702 error = EINVAL; 703 break; 704 } 705 bc = &bridge_control_table[ifd->ifd_cmd]; 706 707 if (cmd == SIOCGDRVSPEC && 708 (bc->bc_flags & BC_F_COPYOUT) == 0) { 709 error = EINVAL; 710 break; 711 } 712 else if (cmd == SIOCSDRVSPEC && 713 (bc->bc_flags & BC_F_COPYOUT) != 0) { 714 error = EINVAL; 715 break; 716 } 717 718 if (bc->bc_flags & BC_F_SUSER) { 719 error = priv_check(td, PRIV_NET_BRIDGE); 720 if (error) 721 break; 722 } 723 724 if (ifd->ifd_len != bc->bc_argsize || 725 ifd->ifd_len > sizeof(args)) { 726 error = EINVAL; 727 break; 728 } 729 730 bzero(&args, sizeof(args)); 731 if (bc->bc_flags & BC_F_COPYIN) { 732 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 733 if (error) 734 break; 735 } 736 737 BRIDGE_LOCK(sc); 738 error = (*bc->bc_func)(sc, &args); 739 BRIDGE_UNLOCK(sc); 740 if (error) 741 break; 742 743 if (bc->bc_flags & BC_F_COPYOUT) 744 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 745 746 break; 747 748 case SIOCSIFFLAGS: 749 if (!(ifp->if_flags & IFF_UP) && 750 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 751 /* 752 * If interface is marked down and it is running, 753 * then stop and disable it. 754 */ 755 BRIDGE_LOCK(sc); 756 bridge_stop(ifp, 1); 757 BRIDGE_UNLOCK(sc); 758 } else if ((ifp->if_flags & IFF_UP) && 759 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 760 /* 761 * If interface is marked up and it is stopped, then 762 * start it. 763 */ 764 (*ifp->if_init)(sc); 765 } 766 break; 767 768 case SIOCSIFMTU: 769 /* Do not allow the MTU to be changed on the bridge */ 770 error = EINVAL; 771 break; 772 773 default: 774 /* 775 * drop the lock as ether_ioctl() will call bridge_start() and 776 * cause the lock to be recursed. 777 */ 778 error = ether_ioctl(ifp, cmd, data); 779 break; 780 } 781 782 return (error); 783 } 784 785 /* 786 * bridge_mutecaps: 787 * 788 * Clear or restore unwanted capabilities on the member interface 789 */ 790 static void 791 bridge_mutecaps(struct bridge_softc *sc) 792 { 793 struct bridge_iflist *bif; 794 int enabled, mask; 795 796 /* Initial bitmask of capabilities to test */ 797 mask = BRIDGE_IFCAPS_MASK; 798 799 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 800 /* Every member must support it or its disabled */ 801 mask &= bif->bif_savedcaps; 802 } 803 804 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 805 enabled = bif->bif_ifp->if_capenable; 806 /* strip off mask bits and enable them again if allowed */ 807 enabled &= ~BRIDGE_IFCAPS_MASK; 808 enabled |= mask; 809 /* 810 * Receive offload can only be enabled if all members also 811 * support send offload. 812 */ 813 if ((enabled & IFCAP_TSO) == 0) 814 enabled &= ~IFCAP_LRO; 815 816 bridge_set_ifcap(sc, bif, enabled); 817 } 818 819 } 820 821 static void 822 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 823 { 824 struct ifnet *ifp = bif->bif_ifp; 825 struct ifreq ifr; 826 int error; 827 828 bzero(&ifr, sizeof(ifr)); 829 ifr.ifr_reqcap = set; 830 831 if (ifp->if_capenable != set) { 832 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 833 if (error) 834 if_printf(sc->sc_ifp, 835 "error setting interface capabilities on %s\n", 836 ifp->if_xname); 837 } 838 } 839 840 /* 841 * bridge_lookup_member: 842 * 843 * Lookup a bridge member interface. 844 */ 845 static struct bridge_iflist * 846 bridge_lookup_member(struct bridge_softc *sc, const char *name) 847 { 848 struct bridge_iflist *bif; 849 struct ifnet *ifp; 850 851 BRIDGE_LOCK_ASSERT(sc); 852 853 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 854 ifp = bif->bif_ifp; 855 if (strcmp(ifp->if_xname, name) == 0) 856 return (bif); 857 } 858 859 return (NULL); 860 } 861 862 /* 863 * bridge_lookup_member_if: 864 * 865 * Lookup a bridge member interface by ifnet*. 866 */ 867 static struct bridge_iflist * 868 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 869 { 870 struct bridge_iflist *bif; 871 872 BRIDGE_LOCK_ASSERT(sc); 873 874 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 875 if (bif->bif_ifp == member_ifp) 876 return (bif); 877 } 878 879 return (NULL); 880 } 881 882 /* 883 * bridge_delete_member: 884 * 885 * Delete the specified member interface. 886 */ 887 static void 888 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 889 int gone) 890 { 891 struct ifnet *ifs = bif->bif_ifp; 892 struct ifnet *fif = NULL; 893 894 BRIDGE_LOCK_ASSERT(sc); 895 896 if (!gone) { 897 switch (ifs->if_type) { 898 case IFT_ETHER: 899 case IFT_L2VLAN: 900 /* 901 * Take the interface out of promiscuous mode. 902 */ 903 (void) ifpromisc(ifs, 0); 904 break; 905 906 case IFT_GIF: 907 break; 908 909 default: 910 #ifdef DIAGNOSTIC 911 panic("bridge_delete_member: impossible"); 912 #endif 913 break; 914 } 915 /* reneable any interface capabilities */ 916 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 917 } 918 919 if (bif->bif_flags & IFBIF_STP) 920 bstp_disable(&bif->bif_stp); 921 922 ifs->if_bridge = NULL; 923 BRIDGE_XLOCK(sc); 924 LIST_REMOVE(bif, bif_next); 925 BRIDGE_XDROP(sc); 926 927 /* 928 * If removing the interface that gave the bridge its mac address, set 929 * the mac address of the bridge to the address of the next member, or 930 * to its default address if no members are left. 931 */ 932 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 933 if (LIST_EMPTY(&sc->sc_iflist)) { 934 bcopy(sc->sc_defaddr, 935 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 936 sc->sc_ifaddr = NULL; 937 } else { 938 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 939 bcopy(IF_LLADDR(fif), 940 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 941 sc->sc_ifaddr = fif; 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 sc->sc_ifaddr = ifs; 1045 } 1046 1047 ifs->if_bridge = sc; 1048 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1049 /* 1050 * XXX: XLOCK HERE!?! 1051 * 1052 * NOTE: insert_***HEAD*** should be safe for the traversals. 1053 */ 1054 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1055 1056 /* Set interface capabilities to the intersection set of all members */ 1057 bridge_mutecaps(sc); 1058 out: 1059 if (error) { 1060 if (bif != NULL) 1061 free(bif, M_DEVBUF); 1062 } 1063 return (error); 1064 } 1065 1066 static int 1067 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1068 { 1069 struct ifbreq *req = arg; 1070 struct bridge_iflist *bif; 1071 1072 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1073 if (bif == NULL) 1074 return (ENOENT); 1075 1076 bridge_delete_member(sc, bif, 0); 1077 1078 return (0); 1079 } 1080 1081 static int 1082 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1083 { 1084 struct ifbreq *req = arg; 1085 struct bridge_iflist *bif; 1086 struct bstp_port *bp; 1087 1088 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1089 if (bif == NULL) 1090 return (ENOENT); 1091 1092 bp = &bif->bif_stp; 1093 req->ifbr_ifsflags = bif->bif_flags; 1094 req->ifbr_state = bp->bp_state; 1095 req->ifbr_priority = bp->bp_priority; 1096 req->ifbr_path_cost = bp->bp_path_cost; 1097 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1098 req->ifbr_proto = bp->bp_protover; 1099 req->ifbr_role = bp->bp_role; 1100 req->ifbr_stpflags = bp->bp_flags; 1101 req->ifbr_addrcnt = bif->bif_addrcnt; 1102 req->ifbr_addrmax = bif->bif_addrmax; 1103 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1104 1105 /* Copy STP state options as flags */ 1106 if (bp->bp_operedge) 1107 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1108 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1109 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1110 if (bp->bp_ptp_link) 1111 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1112 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1113 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1114 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1115 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1116 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1117 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1118 return (0); 1119 } 1120 1121 static int 1122 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1123 { 1124 struct ifbreq *req = arg; 1125 struct bridge_iflist *bif; 1126 struct bstp_port *bp; 1127 int error; 1128 1129 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1130 if (bif == NULL) 1131 return (ENOENT); 1132 bp = &bif->bif_stp; 1133 1134 if (req->ifbr_ifsflags & IFBIF_SPAN) 1135 /* SPAN is readonly */ 1136 return (EINVAL); 1137 1138 if (req->ifbr_ifsflags & IFBIF_STP) { 1139 if ((bif->bif_flags & IFBIF_STP) == 0) { 1140 error = bstp_enable(&bif->bif_stp); 1141 if (error) 1142 return (error); 1143 } 1144 } else { 1145 if ((bif->bif_flags & IFBIF_STP) != 0) 1146 bstp_disable(&bif->bif_stp); 1147 } 1148 1149 /* Pass on STP flags */ 1150 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1151 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1152 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1153 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1154 1155 /* Save the bits relating to the bridge */ 1156 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1157 1158 return (0); 1159 } 1160 1161 static int 1162 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1163 { 1164 struct ifbrparam *param = arg; 1165 1166 sc->sc_brtmax = param->ifbrp_csize; 1167 bridge_rttrim(sc); 1168 1169 return (0); 1170 } 1171 1172 static int 1173 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbrparam *param = arg; 1176 1177 param->ifbrp_csize = sc->sc_brtmax; 1178 1179 return (0); 1180 } 1181 1182 static int 1183 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1184 { 1185 struct ifbifconf *bifc = arg; 1186 struct bridge_iflist *bif; 1187 struct ifbreq breq; 1188 char *buf, *outbuf; 1189 int count, buflen, len, error = 0; 1190 1191 count = 0; 1192 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1193 count++; 1194 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1195 count++; 1196 1197 buflen = sizeof(breq) * count; 1198 if (bifc->ifbic_len == 0) { 1199 bifc->ifbic_len = buflen; 1200 return (0); 1201 } 1202 BRIDGE_UNLOCK(sc); 1203 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1204 BRIDGE_LOCK(sc); 1205 1206 count = 0; 1207 buf = outbuf; 1208 len = min(bifc->ifbic_len, buflen); 1209 bzero(&breq, sizeof(breq)); 1210 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1211 if (len < sizeof(breq)) 1212 break; 1213 1214 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1215 sizeof(breq.ifbr_ifsname)); 1216 /* Fill in the ifbreq structure */ 1217 error = bridge_ioctl_gifflags(sc, &breq); 1218 if (error) 1219 break; 1220 memcpy(buf, &breq, sizeof(breq)); 1221 count++; 1222 buf += sizeof(breq); 1223 len -= sizeof(breq); 1224 } 1225 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1226 if (len < sizeof(breq)) 1227 break; 1228 1229 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1230 sizeof(breq.ifbr_ifsname)); 1231 breq.ifbr_ifsflags = bif->bif_flags; 1232 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1233 memcpy(buf, &breq, sizeof(breq)); 1234 count++; 1235 buf += sizeof(breq); 1236 len -= sizeof(breq); 1237 } 1238 1239 BRIDGE_UNLOCK(sc); 1240 bifc->ifbic_len = sizeof(breq) * count; 1241 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1242 BRIDGE_LOCK(sc); 1243 free(outbuf, M_TEMP); 1244 return (error); 1245 } 1246 1247 static int 1248 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1249 { 1250 struct ifbaconf *bac = arg; 1251 struct bridge_rtnode *brt; 1252 struct ifbareq bareq; 1253 char *buf, *outbuf; 1254 int count, buflen, len, error = 0; 1255 1256 if (bac->ifbac_len == 0) 1257 return (0); 1258 1259 count = 0; 1260 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1261 count++; 1262 buflen = sizeof(bareq) * count; 1263 1264 BRIDGE_UNLOCK(sc); 1265 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1266 BRIDGE_LOCK(sc); 1267 1268 count = 0; 1269 buf = outbuf; 1270 len = min(bac->ifbac_len, buflen); 1271 bzero(&bareq, sizeof(bareq)); 1272 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1273 if (len < sizeof(bareq)) 1274 goto out; 1275 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1276 sizeof(bareq.ifba_ifsname)); 1277 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1278 bareq.ifba_vlan = brt->brt_vlan; 1279 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1280 time_uptime < brt->brt_expire) 1281 bareq.ifba_expire = brt->brt_expire - time_uptime; 1282 else 1283 bareq.ifba_expire = 0; 1284 bareq.ifba_flags = brt->brt_flags; 1285 1286 memcpy(buf, &bareq, sizeof(bareq)); 1287 count++; 1288 buf += sizeof(bareq); 1289 len -= sizeof(bareq); 1290 } 1291 out: 1292 BRIDGE_UNLOCK(sc); 1293 bac->ifbac_len = sizeof(bareq) * count; 1294 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1295 BRIDGE_LOCK(sc); 1296 free(outbuf, M_TEMP); 1297 return (error); 1298 } 1299 1300 static int 1301 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1302 { 1303 struct ifbareq *req = arg; 1304 struct bridge_iflist *bif; 1305 int error; 1306 1307 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1308 if (bif == NULL) 1309 return (ENOENT); 1310 1311 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1312 req->ifba_flags); 1313 1314 return (error); 1315 } 1316 1317 static int 1318 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1319 { 1320 struct ifbrparam *param = arg; 1321 1322 sc->sc_brttimeout = param->ifbrp_ctime; 1323 return (0); 1324 } 1325 1326 static int 1327 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1328 { 1329 struct ifbrparam *param = arg; 1330 1331 param->ifbrp_ctime = sc->sc_brttimeout; 1332 return (0); 1333 } 1334 1335 static int 1336 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1337 { 1338 struct ifbareq *req = arg; 1339 1340 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1341 } 1342 1343 static int 1344 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1345 { 1346 struct ifbreq *req = arg; 1347 1348 bridge_rtflush(sc, req->ifbr_ifsflags); 1349 return (0); 1350 } 1351 1352 static int 1353 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1354 { 1355 struct ifbrparam *param = arg; 1356 struct bstp_state *bs = &sc->sc_stp; 1357 1358 param->ifbrp_prio = bs->bs_bridge_priority; 1359 return (0); 1360 } 1361 1362 static int 1363 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1364 { 1365 struct ifbrparam *param = arg; 1366 1367 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1368 } 1369 1370 static int 1371 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1372 { 1373 struct ifbrparam *param = arg; 1374 struct bstp_state *bs = &sc->sc_stp; 1375 1376 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1377 return (0); 1378 } 1379 1380 static int 1381 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1382 { 1383 struct ifbrparam *param = arg; 1384 1385 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1386 } 1387 1388 static int 1389 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1390 { 1391 struct ifbrparam *param = arg; 1392 struct bstp_state *bs = &sc->sc_stp; 1393 1394 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1395 return (0); 1396 } 1397 1398 static int 1399 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1400 { 1401 struct ifbrparam *param = arg; 1402 1403 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1404 } 1405 1406 static int 1407 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1408 { 1409 struct ifbrparam *param = arg; 1410 struct bstp_state *bs = &sc->sc_stp; 1411 1412 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1413 return (0); 1414 } 1415 1416 static int 1417 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1418 { 1419 struct ifbrparam *param = arg; 1420 1421 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1422 } 1423 1424 static int 1425 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1426 { 1427 struct ifbreq *req = arg; 1428 struct bridge_iflist *bif; 1429 1430 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1431 if (bif == NULL) 1432 return (ENOENT); 1433 1434 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1435 } 1436 1437 static int 1438 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1439 { 1440 struct ifbreq *req = arg; 1441 struct bridge_iflist *bif; 1442 1443 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1444 if (bif == NULL) 1445 return (ENOENT); 1446 1447 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1448 } 1449 1450 static int 1451 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1452 { 1453 struct ifbreq *req = arg; 1454 struct bridge_iflist *bif; 1455 1456 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1457 if (bif == NULL) 1458 return (ENOENT); 1459 1460 bif->bif_addrmax = req->ifbr_addrmax; 1461 return (0); 1462 } 1463 1464 static int 1465 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1466 { 1467 struct ifbreq *req = arg; 1468 struct bridge_iflist *bif = NULL; 1469 struct ifnet *ifs; 1470 1471 ifs = ifunit(req->ifbr_ifsname); 1472 if (ifs == NULL) 1473 return (ENOENT); 1474 1475 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1476 if (ifs == bif->bif_ifp) 1477 return (EBUSY); 1478 1479 if (ifs->if_bridge != NULL) 1480 return (EBUSY); 1481 1482 switch (ifs->if_type) { 1483 case IFT_ETHER: 1484 case IFT_GIF: 1485 case IFT_L2VLAN: 1486 break; 1487 default: 1488 return (EINVAL); 1489 } 1490 1491 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1492 if (bif == NULL) 1493 return (ENOMEM); 1494 1495 bif->bif_ifp = ifs; 1496 bif->bif_flags = IFBIF_SPAN; 1497 1498 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1499 1500 return (0); 1501 } 1502 1503 static int 1504 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1505 { 1506 struct ifbreq *req = arg; 1507 struct bridge_iflist *bif; 1508 struct ifnet *ifs; 1509 1510 ifs = ifunit(req->ifbr_ifsname); 1511 if (ifs == NULL) 1512 return (ENOENT); 1513 1514 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1515 if (ifs == bif->bif_ifp) 1516 break; 1517 1518 if (bif == NULL) 1519 return (ENOENT); 1520 1521 bridge_delete_span(sc, bif); 1522 1523 return (0); 1524 } 1525 1526 static int 1527 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1528 { 1529 struct ifbropreq *req = arg; 1530 struct bstp_state *bs = &sc->sc_stp; 1531 struct bstp_port *root_port; 1532 1533 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1534 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1535 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1536 1537 root_port = bs->bs_root_port; 1538 if (root_port == NULL) 1539 req->ifbop_root_port = 0; 1540 else 1541 req->ifbop_root_port = root_port->bp_ifp->if_index; 1542 1543 req->ifbop_holdcount = bs->bs_txholdcount; 1544 req->ifbop_priority = bs->bs_bridge_priority; 1545 req->ifbop_protocol = bs->bs_protover; 1546 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1547 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1548 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1549 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1550 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1551 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1552 1553 return (0); 1554 } 1555 1556 static int 1557 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1558 { 1559 struct ifbrparam *param = arg; 1560 1561 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1562 return (0); 1563 } 1564 1565 static int 1566 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1567 { 1568 struct ifbpstpconf *bifstp = arg; 1569 struct bridge_iflist *bif; 1570 struct bstp_port *bp; 1571 struct ifbpstpreq bpreq; 1572 char *buf, *outbuf; 1573 int count, buflen, len, error = 0; 1574 1575 count = 0; 1576 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1577 if ((bif->bif_flags & IFBIF_STP) != 0) 1578 count++; 1579 } 1580 1581 buflen = sizeof(bpreq) * count; 1582 if (bifstp->ifbpstp_len == 0) { 1583 bifstp->ifbpstp_len = buflen; 1584 return (0); 1585 } 1586 1587 BRIDGE_UNLOCK(sc); 1588 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1589 BRIDGE_LOCK(sc); 1590 1591 count = 0; 1592 buf = outbuf; 1593 len = min(bifstp->ifbpstp_len, buflen); 1594 bzero(&bpreq, sizeof(bpreq)); 1595 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1596 if (len < sizeof(bpreq)) 1597 break; 1598 1599 if ((bif->bif_flags & IFBIF_STP) == 0) 1600 continue; 1601 1602 bp = &bif->bif_stp; 1603 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1604 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1605 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1606 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1607 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1608 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1609 1610 memcpy(buf, &bpreq, sizeof(bpreq)); 1611 count++; 1612 buf += sizeof(bpreq); 1613 len -= sizeof(bpreq); 1614 } 1615 1616 BRIDGE_UNLOCK(sc); 1617 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1618 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1619 BRIDGE_LOCK(sc); 1620 free(outbuf, M_TEMP); 1621 return (error); 1622 } 1623 1624 static int 1625 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1626 { 1627 struct ifbrparam *param = arg; 1628 1629 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1630 } 1631 1632 static int 1633 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1634 { 1635 struct ifbrparam *param = arg; 1636 1637 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1638 } 1639 1640 /* 1641 * bridge_ifdetach: 1642 * 1643 * Detach an interface from a bridge. Called when a member 1644 * interface is detaching. 1645 */ 1646 static void 1647 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1648 { 1649 struct bridge_softc *sc = ifp->if_bridge; 1650 struct bridge_iflist *bif; 1651 1652 /* Check if the interface is a bridge member */ 1653 if (sc != NULL) { 1654 BRIDGE_LOCK(sc); 1655 1656 bif = bridge_lookup_member_if(sc, ifp); 1657 if (bif != NULL) 1658 bridge_delete_member(sc, bif, 1); 1659 1660 BRIDGE_UNLOCK(sc); 1661 return; 1662 } 1663 1664 /* Check if the interface is a span port */ 1665 mtx_lock(&bridge_list_mtx); 1666 LIST_FOREACH(sc, &bridge_list, sc_list) { 1667 BRIDGE_LOCK(sc); 1668 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1669 if (ifp == bif->bif_ifp) { 1670 bridge_delete_span(sc, bif); 1671 break; 1672 } 1673 1674 BRIDGE_UNLOCK(sc); 1675 } 1676 mtx_unlock(&bridge_list_mtx); 1677 } 1678 1679 /* 1680 * bridge_init: 1681 * 1682 * Initialize a bridge interface. 1683 */ 1684 static void 1685 bridge_init(void *xsc) 1686 { 1687 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1688 struct ifnet *ifp = sc->sc_ifp; 1689 1690 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1691 return; 1692 1693 BRIDGE_LOCK(sc); 1694 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1695 bridge_timer, sc); 1696 1697 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1698 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1699 1700 BRIDGE_UNLOCK(sc); 1701 } 1702 1703 /* 1704 * bridge_stop: 1705 * 1706 * Stop the bridge interface. 1707 */ 1708 static void 1709 bridge_stop(struct ifnet *ifp, int disable) 1710 { 1711 struct bridge_softc *sc = ifp->if_softc; 1712 1713 BRIDGE_LOCK_ASSERT(sc); 1714 1715 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1716 return; 1717 1718 callout_stop(&sc->sc_brcallout); 1719 bstp_stop(&sc->sc_stp); 1720 1721 bridge_rtflush(sc, IFBF_FLUSHDYN); 1722 1723 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1724 } 1725 1726 /* 1727 * bridge_enqueue: 1728 * 1729 * Enqueue a packet on a bridge member interface. 1730 * 1731 */ 1732 static void 1733 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1734 { 1735 int len, err = 0; 1736 short mflags; 1737 struct mbuf *m0; 1738 1739 len = m->m_pkthdr.len; 1740 mflags = m->m_flags; 1741 1742 /* We may be sending a fragment so traverse the mbuf */ 1743 for (; m; m = m0) { 1744 m0 = m->m_nextpkt; 1745 m->m_nextpkt = NULL; 1746 1747 /* 1748 * If underlying interface can not do VLAN tag insertion itself 1749 * then attach a packet tag that holds it. 1750 */ 1751 if ((m->m_flags & M_VLANTAG) && 1752 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1753 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1754 if (m == NULL) { 1755 if_printf(dst_ifp, 1756 "unable to prepend VLAN header\n"); 1757 dst_ifp->if_oerrors++; 1758 continue; 1759 } 1760 m->m_flags &= ~M_VLANTAG; 1761 } 1762 1763 if (err == 0) 1764 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1765 } 1766 1767 if (err == 0) { 1768 1769 sc->sc_ifp->if_opackets++; 1770 sc->sc_ifp->if_obytes += len; 1771 1772 dst_ifp->if_obytes += len; 1773 1774 if (mflags & M_MCAST) { 1775 sc->sc_ifp->if_omcasts++; 1776 dst_ifp->if_omcasts++; 1777 } 1778 } 1779 1780 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1781 (*dst_ifp->if_start)(dst_ifp); 1782 } 1783 1784 /* 1785 * bridge_dummynet: 1786 * 1787 * Receive a queued packet from dummynet and pass it on to the output 1788 * interface. 1789 * 1790 * The mbuf has the Ethernet header already attached. 1791 */ 1792 static void 1793 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1794 { 1795 struct bridge_softc *sc; 1796 1797 sc = ifp->if_bridge; 1798 1799 /* 1800 * The packet didnt originate from a member interface. This should only 1801 * ever happen if a member interface is removed while packets are 1802 * queued for it. 1803 */ 1804 if (sc == NULL) { 1805 m_freem(m); 1806 return; 1807 } 1808 1809 if (PFIL_HOOKED(&inet_pfil_hook) 1810 #ifdef INET6 1811 || PFIL_HOOKED(&inet6_pfil_hook) 1812 #endif 1813 ) { 1814 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1815 return; 1816 if (m == NULL) 1817 return; 1818 } 1819 1820 bridge_enqueue(sc, ifp, m); 1821 } 1822 1823 /* 1824 * bridge_output: 1825 * 1826 * Send output from a bridge member interface. This 1827 * performs the bridging function for locally originated 1828 * packets. 1829 * 1830 * The mbuf has the Ethernet header already attached. We must 1831 * enqueue or free the mbuf before returning. 1832 */ 1833 static int 1834 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1835 struct rtentry *rt) 1836 { 1837 struct ether_header *eh; 1838 struct ifnet *dst_if; 1839 struct bridge_softc *sc; 1840 uint16_t vlan; 1841 1842 if (m->m_len < ETHER_HDR_LEN) { 1843 m = m_pullup(m, ETHER_HDR_LEN); 1844 if (m == NULL) 1845 return (0); 1846 } 1847 1848 eh = mtod(m, struct ether_header *); 1849 sc = ifp->if_bridge; 1850 vlan = VLANTAGOF(m); 1851 1852 BRIDGE_LOCK(sc); 1853 1854 /* 1855 * If bridge is down, but the original output interface is up, 1856 * go ahead and send out that interface. Otherwise, the packet 1857 * is dropped below. 1858 */ 1859 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1860 dst_if = ifp; 1861 goto sendunicast; 1862 } 1863 1864 /* 1865 * If the packet is a multicast, or we don't know a better way to 1866 * get there, send to all interfaces. 1867 */ 1868 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1869 dst_if = NULL; 1870 else 1871 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1872 if (dst_if == NULL) { 1873 struct bridge_iflist *bif; 1874 struct mbuf *mc; 1875 int error = 0, used = 0; 1876 1877 bridge_span(sc, m); 1878 1879 BRIDGE_LOCK2REF(sc, error); 1880 if (error) { 1881 m_freem(m); 1882 return (0); 1883 } 1884 1885 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1886 dst_if = bif->bif_ifp; 1887 1888 if (dst_if->if_type == IFT_GIF) 1889 continue; 1890 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1891 continue; 1892 1893 /* 1894 * If this is not the original output interface, 1895 * and the interface is participating in spanning 1896 * tree, make sure the port is in a state that 1897 * allows forwarding. 1898 */ 1899 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1900 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1901 continue; 1902 1903 if (LIST_NEXT(bif, bif_next) == NULL) { 1904 used = 1; 1905 mc = m; 1906 } else { 1907 mc = m_copypacket(m, M_DONTWAIT); 1908 if (mc == NULL) { 1909 sc->sc_ifp->if_oerrors++; 1910 continue; 1911 } 1912 } 1913 1914 bridge_enqueue(sc, dst_if, mc); 1915 } 1916 if (used == 0) 1917 m_freem(m); 1918 BRIDGE_UNREF(sc); 1919 return (0); 1920 } 1921 1922 sendunicast: 1923 /* 1924 * XXX Spanning tree consideration here? 1925 */ 1926 1927 bridge_span(sc, m); 1928 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1929 m_freem(m); 1930 BRIDGE_UNLOCK(sc); 1931 return (0); 1932 } 1933 1934 BRIDGE_UNLOCK(sc); 1935 bridge_enqueue(sc, dst_if, m); 1936 return (0); 1937 } 1938 1939 /* 1940 * bridge_start: 1941 * 1942 * Start output on a bridge. 1943 * 1944 */ 1945 static void 1946 bridge_start(struct ifnet *ifp) 1947 { 1948 struct bridge_softc *sc; 1949 struct mbuf *m; 1950 struct ether_header *eh; 1951 struct ifnet *dst_if; 1952 1953 sc = ifp->if_softc; 1954 1955 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1956 for (;;) { 1957 IFQ_DEQUEUE(&ifp->if_snd, m); 1958 if (m == 0) 1959 break; 1960 ETHER_BPF_MTAP(ifp, m); 1961 1962 eh = mtod(m, struct ether_header *); 1963 dst_if = NULL; 1964 1965 BRIDGE_LOCK(sc); 1966 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1967 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1968 } 1969 1970 if (dst_if == NULL) 1971 bridge_broadcast(sc, ifp, m, 0); 1972 else { 1973 BRIDGE_UNLOCK(sc); 1974 bridge_enqueue(sc, dst_if, m); 1975 } 1976 } 1977 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1978 } 1979 1980 /* 1981 * bridge_forward: 1982 * 1983 * The forwarding function of the bridge. 1984 * 1985 * NOTE: Releases the lock on return. 1986 */ 1987 static void 1988 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1989 struct mbuf *m) 1990 { 1991 struct bridge_iflist *dbif; 1992 struct ifnet *src_if, *dst_if, *ifp; 1993 struct ether_header *eh; 1994 uint16_t vlan; 1995 uint8_t *dst; 1996 int error; 1997 1998 src_if = m->m_pkthdr.rcvif; 1999 ifp = sc->sc_ifp; 2000 2001 ifp->if_ipackets++; 2002 ifp->if_ibytes += m->m_pkthdr.len; 2003 vlan = VLANTAGOF(m); 2004 2005 if ((sbif->bif_flags & IFBIF_STP) && 2006 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2007 goto drop; 2008 2009 eh = mtod(m, struct ether_header *); 2010 dst = eh->ether_dhost; 2011 2012 /* If the interface is learning, record the address. */ 2013 if (sbif->bif_flags & IFBIF_LEARNING) { 2014 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2015 sbif, 0, IFBAF_DYNAMIC); 2016 /* 2017 * If the interface has addresses limits then deny any source 2018 * that is not in the cache. 2019 */ 2020 if (error && sbif->bif_addrmax) 2021 goto drop; 2022 } 2023 2024 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2025 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2026 goto drop; 2027 2028 /* 2029 * At this point, the port either doesn't participate 2030 * in spanning tree or it is in the forwarding state. 2031 */ 2032 2033 /* 2034 * If the packet is unicast, destined for someone on 2035 * "this" side of the bridge, drop it. 2036 */ 2037 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2038 dst_if = bridge_rtlookup(sc, dst, vlan); 2039 if (src_if == dst_if) 2040 goto drop; 2041 } else { 2042 /* 2043 * Check if its a reserved multicast address, any address 2044 * listed in 802.1D section 7.12.6 may not be forwarded by the 2045 * bridge. 2046 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2047 */ 2048 if (dst[0] == 0x01 && dst[1] == 0x80 && 2049 dst[2] == 0xc2 && dst[3] == 0x00 && 2050 dst[4] == 0x00 && dst[5] <= 0x0f) 2051 goto drop; 2052 2053 /* ...forward it to all interfaces. */ 2054 ifp->if_imcasts++; 2055 dst_if = NULL; 2056 } 2057 2058 /* 2059 * If we have a destination interface which is a member of our bridge, 2060 * OR this is a unicast packet, push it through the bpf(4) machinery. 2061 * For broadcast or multicast packets, don't bother because it will 2062 * be reinjected into ether_input. We do this before we pass the packets 2063 * through the pfil(9) framework, as it is possible that pfil(9) will 2064 * drop the packet, or possibly modify it, making it difficult to debug 2065 * firewall issues on the bridge. 2066 */ 2067 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2068 ETHER_BPF_MTAP(ifp, m); 2069 2070 /* run the packet filter */ 2071 if (PFIL_HOOKED(&inet_pfil_hook) 2072 #ifdef INET6 2073 || PFIL_HOOKED(&inet6_pfil_hook) 2074 #endif 2075 ) { 2076 BRIDGE_UNLOCK(sc); 2077 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2078 return; 2079 if (m == NULL) 2080 return; 2081 BRIDGE_LOCK(sc); 2082 } 2083 2084 if (dst_if == NULL) { 2085 bridge_broadcast(sc, src_if, m, 1); 2086 return; 2087 } 2088 2089 /* 2090 * At this point, we're dealing with a unicast frame 2091 * going to a different interface. 2092 */ 2093 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2094 goto drop; 2095 2096 dbif = bridge_lookup_member_if(sc, dst_if); 2097 if (dbif == NULL) 2098 /* Not a member of the bridge (anymore?) */ 2099 goto drop; 2100 2101 /* Private segments can not talk to each other */ 2102 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2103 goto drop; 2104 2105 if ((dbif->bif_flags & IFBIF_STP) && 2106 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2107 goto drop; 2108 2109 BRIDGE_UNLOCK(sc); 2110 2111 if (PFIL_HOOKED(&inet_pfil_hook) 2112 #ifdef INET6 2113 || PFIL_HOOKED(&inet6_pfil_hook) 2114 #endif 2115 ) { 2116 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2117 return; 2118 if (m == NULL) 2119 return; 2120 } 2121 2122 bridge_enqueue(sc, dst_if, m); 2123 return; 2124 2125 drop: 2126 BRIDGE_UNLOCK(sc); 2127 m_freem(m); 2128 } 2129 2130 /* 2131 * bridge_input: 2132 * 2133 * Receive input from a member interface. Queue the packet for 2134 * bridging if it is not for us. 2135 */ 2136 static struct mbuf * 2137 bridge_input(struct ifnet *ifp, struct mbuf *m) 2138 { 2139 struct bridge_softc *sc = ifp->if_bridge; 2140 struct bridge_iflist *bif, *bif2; 2141 struct ifnet *bifp; 2142 struct ether_header *eh; 2143 struct mbuf *mc, *mc2; 2144 uint16_t vlan; 2145 int error; 2146 2147 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2148 return (m); 2149 2150 bifp = sc->sc_ifp; 2151 vlan = VLANTAGOF(m); 2152 2153 /* 2154 * Implement support for bridge monitoring. If this flag has been 2155 * set on this interface, discard the packet once we push it through 2156 * the bpf(4) machinery, but before we do, increment the byte and 2157 * packet counters associated with this interface. 2158 */ 2159 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2160 m->m_pkthdr.rcvif = bifp; 2161 ETHER_BPF_MTAP(bifp, m); 2162 bifp->if_ipackets++; 2163 bifp->if_ibytes += m->m_pkthdr.len; 2164 m_freem(m); 2165 return (NULL); 2166 } 2167 BRIDGE_LOCK(sc); 2168 bif = bridge_lookup_member_if(sc, ifp); 2169 if (bif == NULL) { 2170 BRIDGE_UNLOCK(sc); 2171 return (m); 2172 } 2173 2174 eh = mtod(m, struct ether_header *); 2175 2176 bridge_span(sc, m); 2177 2178 if (m->m_flags & (M_BCAST|M_MCAST)) { 2179 /* Tap off 802.1D packets; they do not get forwarded. */ 2180 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2181 ETHER_ADDR_LEN) == 0) { 2182 m = bstp_input(&bif->bif_stp, ifp, m); 2183 if (m == NULL) { 2184 BRIDGE_UNLOCK(sc); 2185 return (NULL); 2186 } 2187 } 2188 2189 if ((bif->bif_flags & IFBIF_STP) && 2190 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2191 BRIDGE_UNLOCK(sc); 2192 return (m); 2193 } 2194 2195 /* 2196 * Make a deep copy of the packet and enqueue the copy 2197 * for bridge processing; return the original packet for 2198 * local processing. 2199 */ 2200 mc = m_dup(m, M_DONTWAIT); 2201 if (mc == NULL) { 2202 BRIDGE_UNLOCK(sc); 2203 return (m); 2204 } 2205 2206 /* Perform the bridge forwarding function with the copy. */ 2207 bridge_forward(sc, bif, mc); 2208 2209 /* 2210 * Reinject the mbuf as arriving on the bridge so we have a 2211 * chance at claiming multicast packets. We can not loop back 2212 * here from ether_input as a bridge is never a member of a 2213 * bridge. 2214 */ 2215 KASSERT(bifp->if_bridge == NULL, 2216 ("loop created in bridge_input")); 2217 mc2 = m_dup(m, M_DONTWAIT); 2218 if (mc2 != NULL) { 2219 /* Keep the layer3 header aligned */ 2220 int i = min(mc2->m_pkthdr.len, max_protohdr); 2221 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2222 } 2223 if (mc2 != NULL) { 2224 mc2->m_pkthdr.rcvif = bifp; 2225 (*bifp->if_input)(bifp, mc2); 2226 } 2227 2228 /* Return the original packet for local processing. */ 2229 return (m); 2230 } 2231 2232 if ((bif->bif_flags & IFBIF_STP) && 2233 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2234 BRIDGE_UNLOCK(sc); 2235 return (m); 2236 } 2237 2238 #ifdef DEV_CARP 2239 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2240 || ((iface)->if_carp \ 2241 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2242 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2243 || ((iface)->if_carp \ 2244 && carp_forus((iface)->if_carp, eh->ether_shost)) 2245 #else 2246 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2247 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2248 #endif 2249 2250 #ifdef INET6 2251 # define OR_PFIL_HOOKED_INET6 \ 2252 || PFIL_HOOKED(&inet6_pfil_hook) 2253 #else 2254 # define OR_PFIL_HOOKED_INET6 2255 #endif 2256 2257 #define GRAB_OUR_PACKETS(iface) \ 2258 if ((iface)->if_type == IFT_GIF) \ 2259 continue; \ 2260 /* It is destined for us. */ \ 2261 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2262 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2263 ) { \ 2264 if ((iface)->if_type == IFT_BRIDGE) { \ 2265 ETHER_BPF_MTAP(iface, m); \ 2266 iface->if_ipackets++; \ 2267 /* Filter on the physical interface. */ \ 2268 if (pfil_local_phys && \ 2269 (PFIL_HOOKED(&inet_pfil_hook) \ 2270 OR_PFIL_HOOKED_INET6)) { \ 2271 if (bridge_pfil(&m, NULL, ifp, \ 2272 PFIL_IN) != 0 || m == NULL) { \ 2273 BRIDGE_UNLOCK(sc); \ 2274 return (NULL); \ 2275 } \ 2276 } \ 2277 } \ 2278 if (bif->bif_flags & IFBIF_LEARNING) { \ 2279 error = bridge_rtupdate(sc, eh->ether_shost, \ 2280 vlan, bif, 0, IFBAF_DYNAMIC); \ 2281 if (error && bif->bif_addrmax) { \ 2282 BRIDGE_UNLOCK(sc); \ 2283 m_freem(m); \ 2284 return (NULL); \ 2285 } \ 2286 } \ 2287 m->m_pkthdr.rcvif = iface; \ 2288 BRIDGE_UNLOCK(sc); \ 2289 return (m); \ 2290 } \ 2291 \ 2292 /* We just received a packet that we sent out. */ \ 2293 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2294 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2295 ) { \ 2296 BRIDGE_UNLOCK(sc); \ 2297 m_freem(m); \ 2298 return (NULL); \ 2299 } 2300 2301 /* 2302 * Unicast. Make sure it's not for the bridge. 2303 */ 2304 do { GRAB_OUR_PACKETS(bifp) } while (0); 2305 2306 /* 2307 * Give a chance for ifp at first priority. This will help when the 2308 * packet comes through the interface like VLAN's with the same MACs 2309 * on several interfaces from the same bridge. This also will save 2310 * some CPU cycles in case the destination interface and the input 2311 * interface (eq ifp) are the same. 2312 */ 2313 do { GRAB_OUR_PACKETS(ifp) } while (0); 2314 2315 /* Now check the all bridge members. */ 2316 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2317 GRAB_OUR_PACKETS(bif2->bif_ifp) 2318 } 2319 2320 #undef OR_CARP_CHECK_WE_ARE_DST 2321 #undef OR_CARP_CHECK_WE_ARE_SRC 2322 #undef OR_PFIL_HOOKED_INET6 2323 #undef GRAB_OUR_PACKETS 2324 2325 /* Perform the bridge forwarding function. */ 2326 bridge_forward(sc, bif, m); 2327 2328 return (NULL); 2329 } 2330 2331 /* 2332 * bridge_broadcast: 2333 * 2334 * Send a frame to all interfaces that are members of 2335 * the bridge, except for the one on which the packet 2336 * arrived. 2337 * 2338 * NOTE: Releases the lock on return. 2339 */ 2340 static void 2341 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2342 struct mbuf *m, int runfilt) 2343 { 2344 struct bridge_iflist *dbif, *sbif; 2345 struct mbuf *mc; 2346 struct ifnet *dst_if; 2347 int error = 0, used = 0, i; 2348 2349 sbif = bridge_lookup_member_if(sc, src_if); 2350 2351 BRIDGE_LOCK2REF(sc, error); 2352 if (error) { 2353 m_freem(m); 2354 return; 2355 } 2356 2357 /* Filter on the bridge interface before broadcasting */ 2358 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2359 #ifdef INET6 2360 || PFIL_HOOKED(&inet6_pfil_hook) 2361 #endif 2362 )) { 2363 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2364 goto out; 2365 if (m == NULL) 2366 goto out; 2367 } 2368 2369 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2370 dst_if = dbif->bif_ifp; 2371 if (dst_if == src_if) 2372 continue; 2373 2374 /* Private segments can not talk to each other */ 2375 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2376 continue; 2377 2378 if ((dbif->bif_flags & IFBIF_STP) && 2379 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2380 continue; 2381 2382 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2383 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2384 continue; 2385 2386 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2387 continue; 2388 2389 if (LIST_NEXT(dbif, bif_next) == NULL) { 2390 mc = m; 2391 used = 1; 2392 } else { 2393 mc = m_dup(m, M_DONTWAIT); 2394 if (mc == NULL) { 2395 sc->sc_ifp->if_oerrors++; 2396 continue; 2397 } 2398 } 2399 2400 /* 2401 * Filter on the output interface. Pass a NULL bridge interface 2402 * pointer so we do not redundantly filter on the bridge for 2403 * each interface we broadcast on. 2404 */ 2405 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2406 #ifdef INET6 2407 || PFIL_HOOKED(&inet6_pfil_hook) 2408 #endif 2409 )) { 2410 if (used == 0) { 2411 /* Keep the layer3 header aligned */ 2412 i = min(mc->m_pkthdr.len, max_protohdr); 2413 mc = m_copyup(mc, i, ETHER_ALIGN); 2414 if (mc == NULL) { 2415 sc->sc_ifp->if_oerrors++; 2416 continue; 2417 } 2418 } 2419 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2420 continue; 2421 if (mc == NULL) 2422 continue; 2423 } 2424 2425 bridge_enqueue(sc, dst_if, mc); 2426 } 2427 if (used == 0) 2428 m_freem(m); 2429 2430 out: 2431 BRIDGE_UNREF(sc); 2432 } 2433 2434 /* 2435 * bridge_span: 2436 * 2437 * Duplicate a packet out one or more interfaces that are in span mode, 2438 * the original mbuf is unmodified. 2439 */ 2440 static void 2441 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2442 { 2443 struct bridge_iflist *bif; 2444 struct ifnet *dst_if; 2445 struct mbuf *mc; 2446 2447 if (LIST_EMPTY(&sc->sc_spanlist)) 2448 return; 2449 2450 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2451 dst_if = bif->bif_ifp; 2452 2453 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2454 continue; 2455 2456 mc = m_copypacket(m, M_DONTWAIT); 2457 if (mc == NULL) { 2458 sc->sc_ifp->if_oerrors++; 2459 continue; 2460 } 2461 2462 bridge_enqueue(sc, dst_if, mc); 2463 } 2464 } 2465 2466 /* 2467 * bridge_rtupdate: 2468 * 2469 * Add a bridge routing entry. 2470 */ 2471 static int 2472 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2473 struct bridge_iflist *bif, int setflags, uint8_t flags) 2474 { 2475 struct bridge_rtnode *brt; 2476 int error; 2477 2478 BRIDGE_LOCK_ASSERT(sc); 2479 2480 /* Check the source address is valid and not multicast. */ 2481 if (ETHER_IS_MULTICAST(dst) || 2482 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2483 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2484 return (EINVAL); 2485 2486 /* 802.1p frames map to vlan 1 */ 2487 if (vlan == 0) 2488 vlan = 1; 2489 2490 /* 2491 * A route for this destination might already exist. If so, 2492 * update it, otherwise create a new one. 2493 */ 2494 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2495 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2496 sc->sc_brtexceeded++; 2497 return (ENOSPC); 2498 } 2499 /* Check per interface address limits (if enabled) */ 2500 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2501 bif->bif_addrexceeded++; 2502 return (ENOSPC); 2503 } 2504 2505 /* 2506 * Allocate a new bridge forwarding node, and 2507 * initialize the expiration time and Ethernet 2508 * address. 2509 */ 2510 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2511 if (brt == NULL) 2512 return (ENOMEM); 2513 2514 if (bif->bif_flags & IFBIF_STICKY) 2515 brt->brt_flags = IFBAF_STICKY; 2516 else 2517 brt->brt_flags = IFBAF_DYNAMIC; 2518 2519 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2520 brt->brt_vlan = vlan; 2521 2522 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2523 uma_zfree(bridge_rtnode_zone, brt); 2524 return (error); 2525 } 2526 brt->brt_dst = bif; 2527 bif->bif_addrcnt++; 2528 } 2529 2530 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2531 brt->brt_dst != bif) { 2532 brt->brt_dst->bif_addrcnt--; 2533 brt->brt_dst = bif; 2534 brt->brt_dst->bif_addrcnt++; 2535 } 2536 2537 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2538 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2539 if (setflags) 2540 brt->brt_flags = flags; 2541 2542 return (0); 2543 } 2544 2545 /* 2546 * bridge_rtlookup: 2547 * 2548 * Lookup the destination interface for an address. 2549 */ 2550 static struct ifnet * 2551 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2552 { 2553 struct bridge_rtnode *brt; 2554 2555 BRIDGE_LOCK_ASSERT(sc); 2556 2557 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2558 return (NULL); 2559 2560 return (brt->brt_ifp); 2561 } 2562 2563 /* 2564 * bridge_rttrim: 2565 * 2566 * Trim the routine table so that we have a number 2567 * of routing entries less than or equal to the 2568 * maximum number. 2569 */ 2570 static void 2571 bridge_rttrim(struct bridge_softc *sc) 2572 { 2573 struct bridge_rtnode *brt, *nbrt; 2574 2575 BRIDGE_LOCK_ASSERT(sc); 2576 2577 /* Make sure we actually need to do this. */ 2578 if (sc->sc_brtcnt <= sc->sc_brtmax) 2579 return; 2580 2581 /* Force an aging cycle; this might trim enough addresses. */ 2582 bridge_rtage(sc); 2583 if (sc->sc_brtcnt <= sc->sc_brtmax) 2584 return; 2585 2586 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2587 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2588 bridge_rtnode_destroy(sc, brt); 2589 if (sc->sc_brtcnt <= sc->sc_brtmax) 2590 return; 2591 } 2592 } 2593 } 2594 2595 /* 2596 * bridge_timer: 2597 * 2598 * Aging timer for the bridge. 2599 */ 2600 static void 2601 bridge_timer(void *arg) 2602 { 2603 struct bridge_softc *sc = arg; 2604 2605 BRIDGE_LOCK_ASSERT(sc); 2606 2607 bridge_rtage(sc); 2608 2609 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2610 callout_reset(&sc->sc_brcallout, 2611 bridge_rtable_prune_period * hz, bridge_timer, sc); 2612 } 2613 2614 /* 2615 * bridge_rtage: 2616 * 2617 * Perform an aging cycle. 2618 */ 2619 static void 2620 bridge_rtage(struct bridge_softc *sc) 2621 { 2622 struct bridge_rtnode *brt, *nbrt; 2623 2624 BRIDGE_LOCK_ASSERT(sc); 2625 2626 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2627 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2628 if (time_uptime >= brt->brt_expire) 2629 bridge_rtnode_destroy(sc, brt); 2630 } 2631 } 2632 } 2633 2634 /* 2635 * bridge_rtflush: 2636 * 2637 * Remove all dynamic addresses from the bridge. 2638 */ 2639 static void 2640 bridge_rtflush(struct bridge_softc *sc, int full) 2641 { 2642 struct bridge_rtnode *brt, *nbrt; 2643 2644 BRIDGE_LOCK_ASSERT(sc); 2645 2646 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2647 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2648 bridge_rtnode_destroy(sc, brt); 2649 } 2650 } 2651 2652 /* 2653 * bridge_rtdaddr: 2654 * 2655 * Remove an address from the table. 2656 */ 2657 static int 2658 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2659 { 2660 struct bridge_rtnode *brt; 2661 int found = 0; 2662 2663 BRIDGE_LOCK_ASSERT(sc); 2664 2665 /* 2666 * If vlan is zero then we want to delete for all vlans so the lookup 2667 * may return more than one. 2668 */ 2669 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2670 bridge_rtnode_destroy(sc, brt); 2671 found = 1; 2672 } 2673 2674 return (found ? 0 : ENOENT); 2675 } 2676 2677 /* 2678 * bridge_rtdelete: 2679 * 2680 * Delete routes to a speicifc member interface. 2681 */ 2682 static void 2683 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2684 { 2685 struct bridge_rtnode *brt, *nbrt; 2686 2687 BRIDGE_LOCK_ASSERT(sc); 2688 2689 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2690 if (brt->brt_ifp == ifp && (full || 2691 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2692 bridge_rtnode_destroy(sc, brt); 2693 } 2694 } 2695 2696 /* 2697 * bridge_rtable_init: 2698 * 2699 * Initialize the route table for this bridge. 2700 */ 2701 static int 2702 bridge_rtable_init(struct bridge_softc *sc) 2703 { 2704 int i; 2705 2706 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2707 M_DEVBUF, M_NOWAIT); 2708 if (sc->sc_rthash == NULL) 2709 return (ENOMEM); 2710 2711 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2712 LIST_INIT(&sc->sc_rthash[i]); 2713 2714 sc->sc_rthash_key = arc4random(); 2715 2716 LIST_INIT(&sc->sc_rtlist); 2717 2718 return (0); 2719 } 2720 2721 /* 2722 * bridge_rtable_fini: 2723 * 2724 * Deconstruct the route table for this bridge. 2725 */ 2726 static void 2727 bridge_rtable_fini(struct bridge_softc *sc) 2728 { 2729 2730 KASSERT(sc->sc_brtcnt == 0, 2731 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2732 free(sc->sc_rthash, M_DEVBUF); 2733 } 2734 2735 /* 2736 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2737 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2738 */ 2739 #define mix(a, b, c) \ 2740 do { \ 2741 a -= b; a -= c; a ^= (c >> 13); \ 2742 b -= c; b -= a; b ^= (a << 8); \ 2743 c -= a; c -= b; c ^= (b >> 13); \ 2744 a -= b; a -= c; a ^= (c >> 12); \ 2745 b -= c; b -= a; b ^= (a << 16); \ 2746 c -= a; c -= b; c ^= (b >> 5); \ 2747 a -= b; a -= c; a ^= (c >> 3); \ 2748 b -= c; b -= a; b ^= (a << 10); \ 2749 c -= a; c -= b; c ^= (b >> 15); \ 2750 } while (/*CONSTCOND*/0) 2751 2752 static __inline uint32_t 2753 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2754 { 2755 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2756 2757 b += addr[5] << 8; 2758 b += addr[4]; 2759 a += addr[3] << 24; 2760 a += addr[2] << 16; 2761 a += addr[1] << 8; 2762 a += addr[0]; 2763 2764 mix(a, b, c); 2765 2766 return (c & BRIDGE_RTHASH_MASK); 2767 } 2768 2769 #undef mix 2770 2771 static int 2772 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2773 { 2774 int i, d; 2775 2776 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2777 d = ((int)a[i]) - ((int)b[i]); 2778 } 2779 2780 return (d); 2781 } 2782 2783 /* 2784 * bridge_rtnode_lookup: 2785 * 2786 * Look up a bridge route node for the specified destination. Compare the 2787 * vlan id or if zero then just return the first match. 2788 */ 2789 static struct bridge_rtnode * 2790 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2791 { 2792 struct bridge_rtnode *brt; 2793 uint32_t hash; 2794 int dir; 2795 2796 BRIDGE_LOCK_ASSERT(sc); 2797 2798 hash = bridge_rthash(sc, addr); 2799 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2800 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2801 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2802 return (brt); 2803 if (dir > 0) 2804 return (NULL); 2805 } 2806 2807 return (NULL); 2808 } 2809 2810 /* 2811 * bridge_rtnode_insert: 2812 * 2813 * Insert the specified bridge node into the route table. We 2814 * assume the entry is not already in the table. 2815 */ 2816 static int 2817 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2818 { 2819 struct bridge_rtnode *lbrt; 2820 uint32_t hash; 2821 int dir; 2822 2823 BRIDGE_LOCK_ASSERT(sc); 2824 2825 hash = bridge_rthash(sc, brt->brt_addr); 2826 2827 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2828 if (lbrt == NULL) { 2829 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2830 goto out; 2831 } 2832 2833 do { 2834 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2835 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2836 return (EEXIST); 2837 if (dir > 0) { 2838 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2839 goto out; 2840 } 2841 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2842 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2843 goto out; 2844 } 2845 lbrt = LIST_NEXT(lbrt, brt_hash); 2846 } while (lbrt != NULL); 2847 2848 #ifdef DIAGNOSTIC 2849 panic("bridge_rtnode_insert: impossible"); 2850 #endif 2851 2852 out: 2853 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2854 sc->sc_brtcnt++; 2855 2856 return (0); 2857 } 2858 2859 /* 2860 * bridge_rtnode_destroy: 2861 * 2862 * Destroy a bridge rtnode. 2863 */ 2864 static void 2865 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2866 { 2867 BRIDGE_LOCK_ASSERT(sc); 2868 2869 LIST_REMOVE(brt, brt_hash); 2870 2871 LIST_REMOVE(brt, brt_list); 2872 sc->sc_brtcnt--; 2873 brt->brt_dst->bif_addrcnt--; 2874 uma_zfree(bridge_rtnode_zone, brt); 2875 } 2876 2877 /* 2878 * bridge_rtable_expire: 2879 * 2880 * Set the expiry time for all routes on an interface. 2881 */ 2882 static void 2883 bridge_rtable_expire(struct ifnet *ifp, int age) 2884 { 2885 struct bridge_softc *sc = ifp->if_bridge; 2886 struct bridge_rtnode *brt; 2887 2888 BRIDGE_LOCK(sc); 2889 2890 /* 2891 * If the age is zero then flush, otherwise set all the expiry times to 2892 * age for the interface 2893 */ 2894 if (age == 0) 2895 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2896 else { 2897 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2898 /* Cap the expiry time to 'age' */ 2899 if (brt->brt_ifp == ifp && 2900 brt->brt_expire > time_uptime + age && 2901 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2902 brt->brt_expire = time_uptime + age; 2903 } 2904 } 2905 BRIDGE_UNLOCK(sc); 2906 } 2907 2908 /* 2909 * bridge_state_change: 2910 * 2911 * Callback from the bridgestp code when a port changes states. 2912 */ 2913 static void 2914 bridge_state_change(struct ifnet *ifp, int state) 2915 { 2916 struct bridge_softc *sc = ifp->if_bridge; 2917 static const char *stpstates[] = { 2918 "disabled", 2919 "listening", 2920 "learning", 2921 "forwarding", 2922 "blocking", 2923 "discarding" 2924 }; 2925 2926 if (log_stp) 2927 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2928 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2929 } 2930 2931 /* 2932 * Send bridge packets through pfil if they are one of the types pfil can deal 2933 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2934 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2935 * that interface. 2936 */ 2937 static int 2938 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2939 { 2940 int snap, error, i, hlen; 2941 struct ether_header *eh1, eh2; 2942 struct ip_fw_args args; 2943 struct ip *ip; 2944 struct llc llc1; 2945 u_int16_t ether_type; 2946 2947 snap = 0; 2948 error = -1; /* Default error if not error == 0 */ 2949 2950 #if 0 2951 /* we may return with the IP fields swapped, ensure its not shared */ 2952 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2953 #endif 2954 2955 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2956 return (0); /* filtering is disabled */ 2957 2958 i = min((*mp)->m_pkthdr.len, max_protohdr); 2959 if ((*mp)->m_len < i) { 2960 *mp = m_pullup(*mp, i); 2961 if (*mp == NULL) { 2962 printf("%s: m_pullup failed\n", __func__); 2963 return (-1); 2964 } 2965 } 2966 2967 eh1 = mtod(*mp, struct ether_header *); 2968 ether_type = ntohs(eh1->ether_type); 2969 2970 /* 2971 * Check for SNAP/LLC. 2972 */ 2973 if (ether_type < ETHERMTU) { 2974 struct llc *llc2 = (struct llc *)(eh1 + 1); 2975 2976 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2977 llc2->llc_dsap == LLC_SNAP_LSAP && 2978 llc2->llc_ssap == LLC_SNAP_LSAP && 2979 llc2->llc_control == LLC_UI) { 2980 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2981 snap = 1; 2982 } 2983 } 2984 2985 /* 2986 * If we're trying to filter bridge traffic, don't look at anything 2987 * other than IP and ARP traffic. If the filter doesn't understand 2988 * IPv6, don't allow IPv6 through the bridge either. This is lame 2989 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2990 * but of course we don't have an AppleTalk filter to begin with. 2991 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2992 * ARP traffic.) 2993 */ 2994 switch (ether_type) { 2995 case ETHERTYPE_ARP: 2996 case ETHERTYPE_REVARP: 2997 if (pfil_ipfw_arp == 0) 2998 return (0); /* Automatically pass */ 2999 break; 3000 3001 case ETHERTYPE_IP: 3002 #ifdef INET6 3003 case ETHERTYPE_IPV6: 3004 #endif /* INET6 */ 3005 break; 3006 default: 3007 /* 3008 * Check to see if the user wants to pass non-ip 3009 * packets, these will not be checked by pfil(9) and 3010 * passed unconditionally so the default is to drop. 3011 */ 3012 if (pfil_onlyip) 3013 goto bad; 3014 } 3015 3016 /* Strip off the Ethernet header and keep a copy. */ 3017 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3018 m_adj(*mp, ETHER_HDR_LEN); 3019 3020 /* Strip off snap header, if present */ 3021 if (snap) { 3022 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3023 m_adj(*mp, sizeof(struct llc)); 3024 } 3025 3026 /* 3027 * Check the IP header for alignment and errors 3028 */ 3029 if (dir == PFIL_IN) { 3030 switch (ether_type) { 3031 case ETHERTYPE_IP: 3032 error = bridge_ip_checkbasic(mp); 3033 break; 3034 #ifdef INET6 3035 case ETHERTYPE_IPV6: 3036 error = bridge_ip6_checkbasic(mp); 3037 break; 3038 #endif /* INET6 */ 3039 default: 3040 error = 0; 3041 } 3042 if (error) 3043 goto bad; 3044 } 3045 3046 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3047 INIT_VNET_INET(curvnet); 3048 3049 error = -1; 3050 args.rule = ip_dn_claim_rule(*mp); 3051 if (args.rule != NULL && V_fw_one_pass) 3052 goto ipfwpass; /* packet already partially processed */ 3053 3054 args.m = *mp; 3055 args.oif = ifp; 3056 args.next_hop = NULL; 3057 args.eh = &eh2; 3058 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3059 i = ip_fw_chk_ptr(&args); 3060 *mp = args.m; 3061 3062 if (*mp == NULL) 3063 return (error); 3064 3065 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 3066 3067 /* put the Ethernet header back on */ 3068 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3069 if (*mp == NULL) 3070 return (error); 3071 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3072 3073 /* 3074 * Pass the pkt to dummynet, which consumes it. The 3075 * packet will return to us via bridge_dummynet(). 3076 */ 3077 args.oif = ifp; 3078 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3079 return (error); 3080 } 3081 3082 if (i != IP_FW_PASS) /* drop */ 3083 goto bad; 3084 } 3085 3086 ipfwpass: 3087 error = 0; 3088 3089 /* 3090 * Run the packet through pfil 3091 */ 3092 switch (ether_type) { 3093 case ETHERTYPE_IP: 3094 /* 3095 * before calling the firewall, swap fields the same as 3096 * IP does. here we assume the header is contiguous 3097 */ 3098 ip = mtod(*mp, struct ip *); 3099 3100 ip->ip_len = ntohs(ip->ip_len); 3101 ip->ip_off = ntohs(ip->ip_off); 3102 3103 /* 3104 * Run pfil on the member interface and the bridge, both can 3105 * be skipped by clearing pfil_member or pfil_bridge. 3106 * 3107 * Keep the order: 3108 * in_if -> bridge_if -> out_if 3109 */ 3110 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3111 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3112 dir, NULL); 3113 3114 if (*mp == NULL || error != 0) /* filter may consume */ 3115 break; 3116 3117 if (pfil_member && ifp != NULL) 3118 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3119 dir, NULL); 3120 3121 if (*mp == NULL || error != 0) /* filter may consume */ 3122 break; 3123 3124 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3125 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3126 dir, NULL); 3127 3128 if (*mp == NULL || error != 0) /* filter may consume */ 3129 break; 3130 3131 /* check if we need to fragment the packet */ 3132 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3133 i = (*mp)->m_pkthdr.len; 3134 if (i > ifp->if_mtu) { 3135 error = bridge_fragment(ifp, *mp, &eh2, snap, 3136 &llc1); 3137 return (error); 3138 } 3139 } 3140 3141 /* Recalculate the ip checksum and restore byte ordering */ 3142 ip = mtod(*mp, struct ip *); 3143 hlen = ip->ip_hl << 2; 3144 if (hlen < sizeof(struct ip)) 3145 goto bad; 3146 if (hlen > (*mp)->m_len) { 3147 if ((*mp = m_pullup(*mp, hlen)) == 0) 3148 goto bad; 3149 ip = mtod(*mp, struct ip *); 3150 if (ip == NULL) 3151 goto bad; 3152 } 3153 ip->ip_len = htons(ip->ip_len); 3154 ip->ip_off = htons(ip->ip_off); 3155 ip->ip_sum = 0; 3156 if (hlen == sizeof(struct ip)) 3157 ip->ip_sum = in_cksum_hdr(ip); 3158 else 3159 ip->ip_sum = in_cksum(*mp, hlen); 3160 3161 break; 3162 #ifdef INET6 3163 case ETHERTYPE_IPV6: 3164 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3165 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3166 dir, NULL); 3167 3168 if (*mp == NULL || error != 0) /* filter may consume */ 3169 break; 3170 3171 if (pfil_member && ifp != NULL) 3172 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3173 dir, NULL); 3174 3175 if (*mp == NULL || error != 0) /* filter may consume */ 3176 break; 3177 3178 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3179 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3180 dir, NULL); 3181 break; 3182 #endif 3183 default: 3184 error = 0; 3185 break; 3186 } 3187 3188 if (*mp == NULL) 3189 return (error); 3190 if (error != 0) 3191 goto bad; 3192 3193 error = -1; 3194 3195 /* 3196 * Finally, put everything back the way it was and return 3197 */ 3198 if (snap) { 3199 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3200 if (*mp == NULL) 3201 return (error); 3202 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3203 } 3204 3205 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3206 if (*mp == NULL) 3207 return (error); 3208 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3209 3210 return (0); 3211 3212 bad: 3213 m_freem(*mp); 3214 *mp = NULL; 3215 return (error); 3216 } 3217 3218 /* 3219 * Perform basic checks on header size since 3220 * pfil assumes ip_input has already processed 3221 * it for it. Cut-and-pasted from ip_input.c. 3222 * Given how simple the IPv6 version is, 3223 * does the IPv4 version really need to be 3224 * this complicated? 3225 * 3226 * XXX Should we update ipstat here, or not? 3227 * XXX Right now we update ipstat but not 3228 * XXX csum_counter. 3229 */ 3230 static int 3231 bridge_ip_checkbasic(struct mbuf **mp) 3232 { 3233 INIT_VNET_INET(curvnet); 3234 struct mbuf *m = *mp; 3235 struct ip *ip; 3236 int len, hlen; 3237 u_short sum; 3238 3239 if (*mp == NULL) 3240 return (-1); 3241 3242 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3243 if ((m = m_copyup(m, sizeof(struct ip), 3244 (max_linkhdr + 3) & ~3)) == NULL) { 3245 /* XXXJRT new stat, please */ 3246 IPSTAT_INC(ips_toosmall); 3247 goto bad; 3248 } 3249 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3250 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3251 IPSTAT_INC(ips_toosmall); 3252 goto bad; 3253 } 3254 } 3255 ip = mtod(m, struct ip *); 3256 if (ip == NULL) goto bad; 3257 3258 if (ip->ip_v != IPVERSION) { 3259 IPSTAT_INC(ips_badvers); 3260 goto bad; 3261 } 3262 hlen = ip->ip_hl << 2; 3263 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3264 IPSTAT_INC(ips_badhlen); 3265 goto bad; 3266 } 3267 if (hlen > m->m_len) { 3268 if ((m = m_pullup(m, hlen)) == 0) { 3269 IPSTAT_INC(ips_badhlen); 3270 goto bad; 3271 } 3272 ip = mtod(m, struct ip *); 3273 if (ip == NULL) goto bad; 3274 } 3275 3276 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3277 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3278 } else { 3279 if (hlen == sizeof(struct ip)) { 3280 sum = in_cksum_hdr(ip); 3281 } else { 3282 sum = in_cksum(m, hlen); 3283 } 3284 } 3285 if (sum) { 3286 IPSTAT_INC(ips_badsum); 3287 goto bad; 3288 } 3289 3290 /* Retrieve the packet length. */ 3291 len = ntohs(ip->ip_len); 3292 3293 /* 3294 * Check for additional length bogosity 3295 */ 3296 if (len < hlen) { 3297 IPSTAT_INC(ips_badlen); 3298 goto bad; 3299 } 3300 3301 /* 3302 * Check that the amount of data in the buffers 3303 * is as at least much as the IP header would have us expect. 3304 * Drop packet if shorter than we expect. 3305 */ 3306 if (m->m_pkthdr.len < len) { 3307 IPSTAT_INC(ips_tooshort); 3308 goto bad; 3309 } 3310 3311 /* Checks out, proceed */ 3312 *mp = m; 3313 return (0); 3314 3315 bad: 3316 *mp = m; 3317 return (-1); 3318 } 3319 3320 #ifdef INET6 3321 /* 3322 * Same as above, but for IPv6. 3323 * Cut-and-pasted from ip6_input.c. 3324 * XXX Should we update ip6stat, or not? 3325 */ 3326 static int 3327 bridge_ip6_checkbasic(struct mbuf **mp) 3328 { 3329 INIT_VNET_INET6(curvnet); 3330 struct mbuf *m = *mp; 3331 struct ip6_hdr *ip6; 3332 3333 /* 3334 * If the IPv6 header is not aligned, slurp it up into a new 3335 * mbuf with space for link headers, in the event we forward 3336 * it. Otherwise, if it is aligned, make sure the entire base 3337 * IPv6 header is in the first mbuf of the chain. 3338 */ 3339 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3340 struct ifnet *inifp = m->m_pkthdr.rcvif; 3341 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3342 (max_linkhdr + 3) & ~3)) == NULL) { 3343 /* XXXJRT new stat, please */ 3344 V_ip6stat.ip6s_toosmall++; 3345 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3346 goto bad; 3347 } 3348 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3349 struct ifnet *inifp = m->m_pkthdr.rcvif; 3350 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3351 V_ip6stat.ip6s_toosmall++; 3352 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3353 goto bad; 3354 } 3355 } 3356 3357 ip6 = mtod(m, struct ip6_hdr *); 3358 3359 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3360 V_ip6stat.ip6s_badvers++; 3361 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3362 goto bad; 3363 } 3364 3365 /* Checks out, proceed */ 3366 *mp = m; 3367 return (0); 3368 3369 bad: 3370 *mp = m; 3371 return (-1); 3372 } 3373 #endif /* INET6 */ 3374 3375 /* 3376 * bridge_fragment: 3377 * 3378 * Return a fragmented mbuf chain. 3379 */ 3380 static int 3381 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3382 int snap, struct llc *llc) 3383 { 3384 INIT_VNET_INET(curvnet); 3385 struct mbuf *m0; 3386 struct ip *ip; 3387 int error = -1; 3388 3389 if (m->m_len < sizeof(struct ip) && 3390 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3391 goto out; 3392 ip = mtod(m, struct ip *); 3393 3394 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3395 CSUM_DELAY_IP); 3396 if (error) 3397 goto out; 3398 3399 /* walk the chain and re-add the Ethernet header */ 3400 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3401 if (error == 0) { 3402 if (snap) { 3403 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3404 if (m0 == NULL) { 3405 error = ENOBUFS; 3406 continue; 3407 } 3408 bcopy(llc, mtod(m0, caddr_t), 3409 sizeof(struct llc)); 3410 } 3411 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3412 if (m0 == NULL) { 3413 error = ENOBUFS; 3414 continue; 3415 } 3416 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3417 } else 3418 m_freem(m); 3419 } 3420 3421 if (error == 0) 3422 IPSTAT_INC(ips_fragmented); 3423 3424 return (error); 3425 3426 out: 3427 if (m != NULL) 3428 m_freem(m); 3429 return (error); 3430 } 3431