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/vimage.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_clone.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_var.h> 111 #include <net/pfil.h> 112 113 #include <netinet/in.h> /* for struct arpcom */ 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #include <netinet/vinet.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/vinet6.h> 123 #endif 124 #ifdef DEV_CARP 125 #include <netinet/ip_carp.h> 126 #endif 127 #include <machine/in_cksum.h> 128 #include <netinet/if_ether.h> /* for struct arpcom */ 129 #include <net/bridgestp.h> 130 #include <net/if_bridgevar.h> 131 #include <net/if_llc.h> 132 #include <net/if_vlan_var.h> 133 134 #include <net/route.h> 135 #include <netinet/ip_fw.h> 136 #include <netinet/ip_dummynet.h> 137 138 /* 139 * Size of the route hash table. Must be a power of two. 140 */ 141 #ifndef BRIDGE_RTHASH_SIZE 142 #define BRIDGE_RTHASH_SIZE 1024 143 #endif 144 145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 146 147 /* 148 * Maximum number of addresses to cache. 149 */ 150 #ifndef BRIDGE_RTABLE_MAX 151 #define BRIDGE_RTABLE_MAX 100 152 #endif 153 154 /* 155 * Timeout (in seconds) for entries learned dynamically. 156 */ 157 #ifndef BRIDGE_RTABLE_TIMEOUT 158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 159 #endif 160 161 /* 162 * Number of seconds between walks of the route list. 163 */ 164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 166 #endif 167 168 /* 169 * List of capabilities to possibly mask on the member interface. 170 */ 171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 172 173 /* 174 * Bridge interface list entry. 175 */ 176 struct bridge_iflist { 177 LIST_ENTRY(bridge_iflist) bif_next; 178 struct ifnet *bif_ifp; /* member if */ 179 struct bstp_port bif_stp; /* STP state */ 180 uint32_t bif_flags; /* member if flags */ 181 int bif_savedcaps; /* saved capabilities */ 182 uint32_t bif_addrmax; /* max # of addresses */ 183 uint32_t bif_addrcnt; /* cur. # of addresses */ 184 uint32_t bif_addrexceeded;/* # of address violations */ 185 }; 186 187 /* 188 * Bridge route node. 189 */ 190 struct bridge_rtnode { 191 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 192 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 193 struct bridge_iflist *brt_dst; /* destination if */ 194 unsigned long brt_expire; /* expiration time */ 195 uint8_t brt_flags; /* address flags */ 196 uint8_t brt_addr[ETHER_ADDR_LEN]; 197 uint16_t brt_vlan; /* vlan id */ 198 }; 199 #define brt_ifp brt_dst->bif_ifp 200 201 /* 202 * Software state for each bridge. 203 */ 204 struct bridge_softc { 205 struct ifnet *sc_ifp; /* make this an interface */ 206 LIST_ENTRY(bridge_softc) sc_list; 207 struct mtx sc_mtx; 208 struct cv sc_cv; 209 uint32_t sc_brtmax; /* max # of addresses */ 210 uint32_t sc_brtcnt; /* cur. # of addresses */ 211 uint32_t sc_brttimeout; /* rt timeout in seconds */ 212 struct callout sc_brcallout; /* bridge callout */ 213 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 214 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 215 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 216 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 217 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 218 uint32_t sc_rthash_key; /* key for hash */ 219 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 220 struct bstp_state sc_stp; /* STP state */ 221 uint32_t sc_brtexceeded; /* # of cache drops */ 222 u_char sc_defaddr[6]; /* Default MAC address */ 223 }; 224 225 static struct mtx bridge_list_mtx; 226 eventhandler_tag bridge_detach_cookie = NULL; 227 228 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 229 230 uma_zone_t bridge_rtnode_zone; 231 232 static int bridge_clone_create(struct if_clone *, int, caddr_t); 233 static void bridge_clone_destroy(struct ifnet *); 234 235 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 236 static void bridge_mutecaps(struct bridge_softc *); 237 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 238 int); 239 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 240 static void bridge_init(void *); 241 static void bridge_dummynet(struct mbuf *, struct ifnet *); 242 static void bridge_stop(struct ifnet *, int); 243 static void bridge_start(struct ifnet *); 244 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 245 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 246 struct rtentry *); 247 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 248 struct mbuf *); 249 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 250 251 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 252 struct mbuf *m); 253 254 static void bridge_timer(void *); 255 256 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 257 struct mbuf *, int); 258 static void bridge_span(struct bridge_softc *, struct mbuf *); 259 260 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 261 uint16_t, struct bridge_iflist *, int, uint8_t); 262 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 263 uint16_t); 264 static void bridge_rttrim(struct bridge_softc *); 265 static void bridge_rtage(struct bridge_softc *); 266 static void bridge_rtflush(struct bridge_softc *, int); 267 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 268 uint16_t); 269 270 static int bridge_rtable_init(struct bridge_softc *); 271 static void bridge_rtable_fini(struct bridge_softc *); 272 273 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 274 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 275 const uint8_t *, uint16_t); 276 static int bridge_rtnode_insert(struct bridge_softc *, 277 struct bridge_rtnode *); 278 static void bridge_rtnode_destroy(struct bridge_softc *, 279 struct bridge_rtnode *); 280 static void bridge_rtable_expire(struct ifnet *, int); 281 static void bridge_state_change(struct ifnet *, int); 282 283 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 284 const char *name); 285 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 286 struct ifnet *ifp); 287 static void bridge_delete_member(struct bridge_softc *, 288 struct bridge_iflist *, int); 289 static void bridge_delete_span(struct bridge_softc *, 290 struct bridge_iflist *); 291 292 static int bridge_ioctl_add(struct bridge_softc *, void *); 293 static int bridge_ioctl_del(struct bridge_softc *, void *); 294 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 295 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 296 static int bridge_ioctl_scache(struct bridge_softc *, void *); 297 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 298 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 299 static int bridge_ioctl_rts(struct bridge_softc *, void *); 300 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 301 static int bridge_ioctl_sto(struct bridge_softc *, void *); 302 static int bridge_ioctl_gto(struct bridge_softc *, void *); 303 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 304 static int bridge_ioctl_flush(struct bridge_softc *, void *); 305 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 306 static int bridge_ioctl_spri(struct bridge_softc *, void *); 307 static int bridge_ioctl_ght(struct bridge_softc *, void *); 308 static int bridge_ioctl_sht(struct bridge_softc *, void *); 309 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 310 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 311 static int bridge_ioctl_gma(struct bridge_softc *, void *); 312 static int bridge_ioctl_sma(struct bridge_softc *, void *); 313 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 314 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 315 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 316 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 317 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 318 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 319 static int bridge_ioctl_grte(struct bridge_softc *, void *); 320 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 321 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 322 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 323 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 324 int); 325 static int bridge_ip_checkbasic(struct mbuf **mp); 326 #ifdef INET6 327 static int bridge_ip6_checkbasic(struct mbuf **mp); 328 #endif /* INET6 */ 329 static int bridge_fragment(struct ifnet *, struct mbuf *, 330 struct ether_header *, int, struct llc *); 331 332 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 333 #define VLANTAGOF(_m) \ 334 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 335 336 static struct bstp_cb_ops bridge_ops = { 337 .bcb_state = bridge_state_change, 338 .bcb_rtage = bridge_rtable_expire 339 }; 340 341 SYSCTL_DECL(_net_link); 342 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 343 344 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 345 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 346 static int pfil_member = 1; /* run pfil hooks on the member interface */ 347 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 348 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 349 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 350 locally destined packets */ 351 static int log_stp = 0; /* log STP state changes */ 352 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 353 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 354 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 355 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 356 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 357 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 358 &pfil_bridge, 0, "Packet filter on the bridge interface"); 359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 360 &pfil_member, 0, "Packet filter on the member interface"); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 362 &pfil_local_phys, 0, 363 "Packet filter on the physical interface for locally destined packets"); 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 365 &log_stp, 0, "Log STP state changes"); 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 367 &bridge_inherit_mac, 0, 368 "Inherit MAC address from the first bridge member"); 369 370 struct bridge_control { 371 int (*bc_func)(struct bridge_softc *, void *); 372 int bc_argsize; 373 int bc_flags; 374 }; 375 376 #define BC_F_COPYIN 0x01 /* copy arguments in */ 377 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 378 #define BC_F_SUSER 0x04 /* do super-user check */ 379 380 const struct bridge_control bridge_control_table[] = { 381 { bridge_ioctl_add, sizeof(struct ifbreq), 382 BC_F_COPYIN|BC_F_SUSER }, 383 { bridge_ioctl_del, sizeof(struct ifbreq), 384 BC_F_COPYIN|BC_F_SUSER }, 385 386 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 387 BC_F_COPYIN|BC_F_COPYOUT }, 388 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 389 BC_F_COPYIN|BC_F_SUSER }, 390 391 { bridge_ioctl_scache, sizeof(struct ifbrparam), 392 BC_F_COPYIN|BC_F_SUSER }, 393 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 394 BC_F_COPYOUT }, 395 396 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 397 BC_F_COPYIN|BC_F_COPYOUT }, 398 { bridge_ioctl_rts, sizeof(struct ifbaconf), 399 BC_F_COPYIN|BC_F_COPYOUT }, 400 401 { bridge_ioctl_saddr, sizeof(struct ifbareq), 402 BC_F_COPYIN|BC_F_SUSER }, 403 404 { bridge_ioctl_sto, sizeof(struct ifbrparam), 405 BC_F_COPYIN|BC_F_SUSER }, 406 { bridge_ioctl_gto, sizeof(struct ifbrparam), 407 BC_F_COPYOUT }, 408 409 { bridge_ioctl_daddr, sizeof(struct ifbareq), 410 BC_F_COPYIN|BC_F_SUSER }, 411 412 { bridge_ioctl_flush, sizeof(struct ifbreq), 413 BC_F_COPYIN|BC_F_SUSER }, 414 415 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 416 BC_F_COPYOUT }, 417 { bridge_ioctl_spri, sizeof(struct ifbrparam), 418 BC_F_COPYIN|BC_F_SUSER }, 419 420 { bridge_ioctl_ght, sizeof(struct ifbrparam), 421 BC_F_COPYOUT }, 422 { bridge_ioctl_sht, sizeof(struct ifbrparam), 423 BC_F_COPYIN|BC_F_SUSER }, 424 425 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 426 BC_F_COPYOUT }, 427 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 428 BC_F_COPYIN|BC_F_SUSER }, 429 430 { bridge_ioctl_gma, sizeof(struct ifbrparam), 431 BC_F_COPYOUT }, 432 { bridge_ioctl_sma, sizeof(struct ifbrparam), 433 BC_F_COPYIN|BC_F_SUSER }, 434 435 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 436 BC_F_COPYIN|BC_F_SUSER }, 437 438 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 439 BC_F_COPYIN|BC_F_SUSER }, 440 441 { bridge_ioctl_addspan, sizeof(struct ifbreq), 442 BC_F_COPYIN|BC_F_SUSER }, 443 { bridge_ioctl_delspan, sizeof(struct ifbreq), 444 BC_F_COPYIN|BC_F_SUSER }, 445 446 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 447 BC_F_COPYOUT }, 448 449 { bridge_ioctl_grte, sizeof(struct ifbrparam), 450 BC_F_COPYOUT }, 451 452 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 453 BC_F_COPYIN|BC_F_COPYOUT }, 454 455 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 456 BC_F_COPYIN|BC_F_SUSER }, 457 458 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 459 BC_F_COPYIN|BC_F_SUSER }, 460 461 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 462 BC_F_COPYIN|BC_F_SUSER }, 463 464 }; 465 const int bridge_control_table_size = 466 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 467 468 LIST_HEAD(, bridge_softc) bridge_list; 469 470 IFC_SIMPLE_DECLARE(bridge, 0); 471 472 static int 473 bridge_modevent(module_t mod, int type, void *data) 474 { 475 476 switch (type) { 477 case MOD_LOAD: 478 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 479 if_clone_attach(&bridge_cloner); 480 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 481 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 482 UMA_ALIGN_PTR, 0); 483 LIST_INIT(&bridge_list); 484 bridge_input_p = bridge_input; 485 bridge_output_p = bridge_output; 486 bridge_dn_p = bridge_dummynet; 487 bridge_detach_cookie = EVENTHANDLER_REGISTER( 488 ifnet_departure_event, bridge_ifdetach, NULL, 489 EVENTHANDLER_PRI_ANY); 490 break; 491 case MOD_UNLOAD: 492 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 493 bridge_detach_cookie); 494 if_clone_detach(&bridge_cloner); 495 uma_zdestroy(bridge_rtnode_zone); 496 bridge_input_p = NULL; 497 bridge_output_p = NULL; 498 bridge_dn_p = NULL; 499 mtx_destroy(&bridge_list_mtx); 500 break; 501 default: 502 return (EOPNOTSUPP); 503 } 504 return (0); 505 } 506 507 static moduledata_t bridge_mod = { 508 "if_bridge", 509 bridge_modevent, 510 0 511 }; 512 513 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 514 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 515 516 /* 517 * handler for net.link.bridge.pfil_ipfw 518 */ 519 static int 520 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 521 { 522 int enable = pfil_ipfw; 523 int error; 524 525 error = sysctl_handle_int(oidp, &enable, 0, req); 526 enable = (enable) ? 1 : 0; 527 528 if (enable != pfil_ipfw) { 529 pfil_ipfw = enable; 530 531 /* 532 * Disable pfil so that ipfw doesnt run twice, if the user 533 * really wants both then they can re-enable pfil_bridge and/or 534 * pfil_member. Also allow non-ip packets as ipfw can filter by 535 * layer2 type. 536 */ 537 if (pfil_ipfw) { 538 pfil_onlyip = 0; 539 pfil_bridge = 0; 540 pfil_member = 0; 541 } 542 } 543 544 return (error); 545 } 546 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 547 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 548 549 /* 550 * bridge_clone_create: 551 * 552 * Create a new bridge instance. 553 */ 554 static int 555 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 556 { 557 struct bridge_softc *sc, *sc2; 558 struct ifnet *bifp, *ifp; 559 int retry; 560 561 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 562 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 563 if (ifp == NULL) { 564 free(sc, M_DEVBUF); 565 return (ENOSPC); 566 } 567 568 BRIDGE_LOCK_INIT(sc); 569 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 570 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 571 572 /* Initialize our routing table. */ 573 bridge_rtable_init(sc); 574 575 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 576 577 LIST_INIT(&sc->sc_iflist); 578 LIST_INIT(&sc->sc_spanlist); 579 580 ifp->if_softc = sc; 581 if_initname(ifp, ifc->ifc_name, unit); 582 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 583 ifp->if_ioctl = bridge_ioctl; 584 ifp->if_start = bridge_start; 585 ifp->if_init = bridge_init; 586 ifp->if_type = IFT_BRIDGE; 587 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 588 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 589 IFQ_SET_READY(&ifp->if_snd); 590 591 /* 592 * Generate a random ethernet address with a locally administered 593 * address. 594 * 595 * Since we are using random ethernet addresses for the bridge, it is 596 * possible that we might have address collisions, so make sure that 597 * this hardware address isn't already in use on another bridge. 598 */ 599 for (retry = 1; retry != 0;) { 600 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 601 sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ 602 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 603 retry = 0; 604 mtx_lock(&bridge_list_mtx); 605 LIST_FOREACH(sc2, &bridge_list, sc_list) { 606 bifp = sc2->sc_ifp; 607 if (memcmp(sc->sc_defaddr, 608 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 609 retry = 1; 610 } 611 mtx_unlock(&bridge_list_mtx); 612 } 613 614 bstp_attach(&sc->sc_stp, &bridge_ops); 615 ether_ifattach(ifp, sc->sc_defaddr); 616 /* Now undo some of the damage... */ 617 ifp->if_baudrate = 0; 618 ifp->if_type = IFT_BRIDGE; 619 620 mtx_lock(&bridge_list_mtx); 621 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 622 mtx_unlock(&bridge_list_mtx); 623 624 return (0); 625 } 626 627 /* 628 * bridge_clone_destroy: 629 * 630 * Destroy a bridge instance. 631 */ 632 static void 633 bridge_clone_destroy(struct ifnet *ifp) 634 { 635 struct bridge_softc *sc = ifp->if_softc; 636 struct bridge_iflist *bif; 637 638 BRIDGE_LOCK(sc); 639 640 bridge_stop(ifp, 1); 641 ifp->if_flags &= ~IFF_UP; 642 643 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 644 bridge_delete_member(sc, bif, 0); 645 646 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 647 bridge_delete_span(sc, bif); 648 } 649 650 BRIDGE_UNLOCK(sc); 651 652 callout_drain(&sc->sc_brcallout); 653 654 mtx_lock(&bridge_list_mtx); 655 LIST_REMOVE(sc, sc_list); 656 mtx_unlock(&bridge_list_mtx); 657 658 bstp_detach(&sc->sc_stp); 659 ether_ifdetach(ifp); 660 if_free_type(ifp, IFT_ETHER); 661 662 /* Tear down the routing table. */ 663 bridge_rtable_fini(sc); 664 665 BRIDGE_LOCK_DESTROY(sc); 666 free(sc, M_DEVBUF); 667 } 668 669 /* 670 * bridge_ioctl: 671 * 672 * Handle a control request from the operator. 673 */ 674 static int 675 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 676 { 677 struct bridge_softc *sc = ifp->if_softc; 678 struct thread *td = curthread; 679 union { 680 struct ifbreq ifbreq; 681 struct ifbifconf ifbifconf; 682 struct ifbareq ifbareq; 683 struct ifbaconf ifbaconf; 684 struct ifbrparam ifbrparam; 685 struct ifbropreq ifbropreq; 686 } args; 687 struct ifdrv *ifd = (struct ifdrv *) data; 688 const struct bridge_control *bc; 689 int error = 0; 690 691 switch (cmd) { 692 693 case SIOCADDMULTI: 694 case SIOCDELMULTI: 695 break; 696 697 case SIOCGDRVSPEC: 698 case SIOCSDRVSPEC: 699 if (ifd->ifd_cmd >= bridge_control_table_size) { 700 error = EINVAL; 701 break; 702 } 703 bc = &bridge_control_table[ifd->ifd_cmd]; 704 705 if (cmd == SIOCGDRVSPEC && 706 (bc->bc_flags & BC_F_COPYOUT) == 0) { 707 error = EINVAL; 708 break; 709 } 710 else if (cmd == SIOCSDRVSPEC && 711 (bc->bc_flags & BC_F_COPYOUT) != 0) { 712 error = EINVAL; 713 break; 714 } 715 716 if (bc->bc_flags & BC_F_SUSER) { 717 error = priv_check(td, PRIV_NET_BRIDGE); 718 if (error) 719 break; 720 } 721 722 if (ifd->ifd_len != bc->bc_argsize || 723 ifd->ifd_len > sizeof(args)) { 724 error = EINVAL; 725 break; 726 } 727 728 bzero(&args, sizeof(args)); 729 if (bc->bc_flags & BC_F_COPYIN) { 730 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 731 if (error) 732 break; 733 } 734 735 BRIDGE_LOCK(sc); 736 error = (*bc->bc_func)(sc, &args); 737 BRIDGE_UNLOCK(sc); 738 if (error) 739 break; 740 741 if (bc->bc_flags & BC_F_COPYOUT) 742 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 743 744 break; 745 746 case SIOCSIFFLAGS: 747 if (!(ifp->if_flags & IFF_UP) && 748 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 749 /* 750 * If interface is marked down and it is running, 751 * then stop and disable it. 752 */ 753 BRIDGE_LOCK(sc); 754 bridge_stop(ifp, 1); 755 BRIDGE_UNLOCK(sc); 756 } else if ((ifp->if_flags & IFF_UP) && 757 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 758 /* 759 * If interface is marked up and it is stopped, then 760 * start it. 761 */ 762 (*ifp->if_init)(sc); 763 } 764 break; 765 766 case SIOCSIFMTU: 767 /* Do not allow the MTU to be changed on the bridge */ 768 error = EINVAL; 769 break; 770 771 default: 772 /* 773 * drop the lock as ether_ioctl() will call bridge_start() and 774 * cause the lock to be recursed. 775 */ 776 error = ether_ioctl(ifp, cmd, data); 777 break; 778 } 779 780 return (error); 781 } 782 783 /* 784 * bridge_mutecaps: 785 * 786 * Clear or restore unwanted capabilities on the member interface 787 */ 788 static void 789 bridge_mutecaps(struct bridge_softc *sc) 790 { 791 struct bridge_iflist *bif; 792 int enabled, mask; 793 794 /* Initial bitmask of capabilities to test */ 795 mask = BRIDGE_IFCAPS_MASK; 796 797 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 798 /* Every member must support it or its disabled */ 799 mask &= bif->bif_savedcaps; 800 } 801 802 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 803 enabled = bif->bif_ifp->if_capenable; 804 /* strip off mask bits and enable them again if allowed */ 805 enabled &= ~BRIDGE_IFCAPS_MASK; 806 enabled |= mask; 807 /* 808 * Receive offload can only be enabled if all members also 809 * support send offload. 810 */ 811 if ((enabled & IFCAP_TSO) == 0) 812 enabled &= ~IFCAP_LRO; 813 814 bridge_set_ifcap(sc, bif, enabled); 815 } 816 817 } 818 819 static void 820 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 821 { 822 struct ifnet *ifp = bif->bif_ifp; 823 struct ifreq ifr; 824 int error; 825 826 bzero(&ifr, sizeof(ifr)); 827 ifr.ifr_reqcap = set; 828 829 if (ifp->if_capenable != set) { 830 IFF_LOCKGIANT(ifp); 831 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 832 IFF_UNLOCKGIANT(ifp); 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 && 933 !memcmp(IF_LLADDR(sc->sc_ifp), IF_LLADDR(ifs), ETHER_ADDR_LEN)) { 934 if (LIST_EMPTY(&sc->sc_iflist)) 935 bcopy(sc->sc_defaddr, 936 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 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 } 942 } 943 944 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 945 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 946 KASSERT(bif->bif_addrcnt == 0, 947 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 948 949 BRIDGE_UNLOCK(sc); 950 bstp_destroy(&bif->bif_stp); /* prepare to free */ 951 BRIDGE_LOCK(sc); 952 free(bif, M_DEVBUF); 953 } 954 955 /* 956 * bridge_delete_span: 957 * 958 * Delete the specified span interface. 959 */ 960 static void 961 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 962 { 963 BRIDGE_LOCK_ASSERT(sc); 964 965 KASSERT(bif->bif_ifp->if_bridge == NULL, 966 ("%s: not a span interface", __func__)); 967 968 LIST_REMOVE(bif, bif_next); 969 free(bif, M_DEVBUF); 970 } 971 972 static int 973 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 974 { 975 struct ifbreq *req = arg; 976 struct bridge_iflist *bif = NULL; 977 struct ifnet *ifs; 978 int error = 0; 979 980 ifs = ifunit(req->ifbr_ifsname); 981 if (ifs == NULL) 982 return (ENOENT); 983 if (ifs->if_ioctl == NULL) /* must be supported */ 984 return (EINVAL); 985 986 /* If it's in the span list, it can't be a member. */ 987 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 988 if (ifs == bif->bif_ifp) 989 return (EBUSY); 990 991 /* Allow the first Ethernet member to define the MTU */ 992 if (ifs->if_type != IFT_GIF) { 993 if (LIST_EMPTY(&sc->sc_iflist)) 994 sc->sc_ifp->if_mtu = ifs->if_mtu; 995 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 996 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 997 ifs->if_xname); 998 return (EINVAL); 999 } 1000 } 1001 1002 if (ifs->if_bridge == sc) 1003 return (EEXIST); 1004 1005 if (ifs->if_bridge != NULL) 1006 return (EBUSY); 1007 1008 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1009 if (bif == NULL) 1010 return (ENOMEM); 1011 1012 bif->bif_ifp = ifs; 1013 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1014 bif->bif_savedcaps = ifs->if_capenable; 1015 1016 switch (ifs->if_type) { 1017 case IFT_ETHER: 1018 case IFT_L2VLAN: 1019 /* 1020 * Place the interface into promiscuous mode. 1021 */ 1022 error = ifpromisc(ifs, 1); 1023 if (error) 1024 goto out; 1025 break; 1026 1027 case IFT_GIF: 1028 break; 1029 1030 default: 1031 error = EINVAL; 1032 goto out; 1033 } 1034 1035 /* 1036 * Assign the interface's MAC address to the bridge if it's the first 1037 * member and the MAC address of the bridge has not been changed from 1038 * the default randomly generated one. 1039 */ 1040 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1041 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) 1042 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1043 1044 ifs->if_bridge = sc; 1045 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1046 /* 1047 * XXX: XLOCK HERE!?! 1048 * 1049 * NOTE: insert_***HEAD*** should be safe for the traversals. 1050 */ 1051 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1052 1053 /* Set interface capabilities to the intersection set of all members */ 1054 bridge_mutecaps(sc); 1055 out: 1056 if (error) { 1057 if (bif != NULL) 1058 free(bif, M_DEVBUF); 1059 } 1060 return (error); 1061 } 1062 1063 static int 1064 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1065 { 1066 struct ifbreq *req = arg; 1067 struct bridge_iflist *bif; 1068 1069 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1070 if (bif == NULL) 1071 return (ENOENT); 1072 1073 bridge_delete_member(sc, bif, 0); 1074 1075 return (0); 1076 } 1077 1078 static int 1079 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1080 { 1081 struct ifbreq *req = arg; 1082 struct bridge_iflist *bif; 1083 struct bstp_port *bp; 1084 1085 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1086 if (bif == NULL) 1087 return (ENOENT); 1088 1089 bp = &bif->bif_stp; 1090 req->ifbr_ifsflags = bif->bif_flags; 1091 req->ifbr_state = bp->bp_state; 1092 req->ifbr_priority = bp->bp_priority; 1093 req->ifbr_path_cost = bp->bp_path_cost; 1094 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1095 req->ifbr_proto = bp->bp_protover; 1096 req->ifbr_role = bp->bp_role; 1097 req->ifbr_stpflags = bp->bp_flags; 1098 req->ifbr_addrcnt = bif->bif_addrcnt; 1099 req->ifbr_addrmax = bif->bif_addrmax; 1100 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1101 1102 /* Copy STP state options as flags */ 1103 if (bp->bp_operedge) 1104 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1105 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1106 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1107 if (bp->bp_ptp_link) 1108 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1109 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1110 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1111 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1112 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1113 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1114 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1115 return (0); 1116 } 1117 1118 static int 1119 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1120 { 1121 struct ifbreq *req = arg; 1122 struct bridge_iflist *bif; 1123 struct bstp_port *bp; 1124 int error; 1125 1126 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1127 if (bif == NULL) 1128 return (ENOENT); 1129 bp = &bif->bif_stp; 1130 1131 if (req->ifbr_ifsflags & IFBIF_SPAN) 1132 /* SPAN is readonly */ 1133 return (EINVAL); 1134 1135 if (req->ifbr_ifsflags & IFBIF_STP) { 1136 if ((bif->bif_flags & IFBIF_STP) == 0) { 1137 error = bstp_enable(&bif->bif_stp); 1138 if (error) 1139 return (error); 1140 } 1141 } else { 1142 if ((bif->bif_flags & IFBIF_STP) != 0) 1143 bstp_disable(&bif->bif_stp); 1144 } 1145 1146 /* Pass on STP flags */ 1147 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1148 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1149 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1150 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1151 1152 /* Save the bits relating to the bridge */ 1153 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1154 1155 return (0); 1156 } 1157 1158 static int 1159 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1160 { 1161 struct ifbrparam *param = arg; 1162 1163 sc->sc_brtmax = param->ifbrp_csize; 1164 bridge_rttrim(sc); 1165 1166 return (0); 1167 } 1168 1169 static int 1170 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1171 { 1172 struct ifbrparam *param = arg; 1173 1174 param->ifbrp_csize = sc->sc_brtmax; 1175 1176 return (0); 1177 } 1178 1179 static int 1180 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbifconf *bifc = arg; 1183 struct bridge_iflist *bif; 1184 struct ifbreq breq; 1185 char *buf, *outbuf; 1186 int count, buflen, len, error = 0; 1187 1188 count = 0; 1189 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1190 count++; 1191 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1192 count++; 1193 1194 buflen = sizeof(breq) * count; 1195 if (bifc->ifbic_len == 0) { 1196 bifc->ifbic_len = buflen; 1197 return (0); 1198 } 1199 BRIDGE_UNLOCK(sc); 1200 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1201 BRIDGE_LOCK(sc); 1202 1203 count = 0; 1204 buf = outbuf; 1205 len = min(bifc->ifbic_len, buflen); 1206 bzero(&breq, sizeof(breq)); 1207 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1208 if (len < sizeof(breq)) 1209 break; 1210 1211 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1212 sizeof(breq.ifbr_ifsname)); 1213 /* Fill in the ifbreq structure */ 1214 error = bridge_ioctl_gifflags(sc, &breq); 1215 if (error) 1216 break; 1217 memcpy(buf, &breq, sizeof(breq)); 1218 count++; 1219 buf += sizeof(breq); 1220 len -= sizeof(breq); 1221 } 1222 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1223 if (len < sizeof(breq)) 1224 break; 1225 1226 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1227 sizeof(breq.ifbr_ifsname)); 1228 breq.ifbr_ifsflags = bif->bif_flags; 1229 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1230 memcpy(buf, &breq, sizeof(breq)); 1231 count++; 1232 buf += sizeof(breq); 1233 len -= sizeof(breq); 1234 } 1235 1236 BRIDGE_UNLOCK(sc); 1237 bifc->ifbic_len = sizeof(breq) * count; 1238 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1239 BRIDGE_LOCK(sc); 1240 free(outbuf, M_TEMP); 1241 return (error); 1242 } 1243 1244 static int 1245 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1246 { 1247 struct ifbaconf *bac = arg; 1248 struct bridge_rtnode *brt; 1249 struct ifbareq bareq; 1250 char *buf, *outbuf; 1251 int count, buflen, len, error = 0; 1252 1253 if (bac->ifbac_len == 0) 1254 return (0); 1255 1256 count = 0; 1257 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1258 count++; 1259 buflen = sizeof(bareq) * count; 1260 1261 BRIDGE_UNLOCK(sc); 1262 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1263 BRIDGE_LOCK(sc); 1264 1265 count = 0; 1266 buf = outbuf; 1267 len = min(bac->ifbac_len, buflen); 1268 bzero(&bareq, sizeof(bareq)); 1269 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1270 if (len < sizeof(bareq)) 1271 goto out; 1272 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1273 sizeof(bareq.ifba_ifsname)); 1274 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1275 bareq.ifba_vlan = brt->brt_vlan; 1276 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1277 time_uptime < brt->brt_expire) 1278 bareq.ifba_expire = brt->brt_expire - time_uptime; 1279 else 1280 bareq.ifba_expire = 0; 1281 bareq.ifba_flags = brt->brt_flags; 1282 1283 memcpy(buf, &bareq, sizeof(bareq)); 1284 count++; 1285 buf += sizeof(bareq); 1286 len -= sizeof(bareq); 1287 } 1288 out: 1289 BRIDGE_UNLOCK(sc); 1290 bac->ifbac_len = sizeof(bareq) * count; 1291 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1292 BRIDGE_LOCK(sc); 1293 free(outbuf, M_TEMP); 1294 return (error); 1295 } 1296 1297 static int 1298 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1299 { 1300 struct ifbareq *req = arg; 1301 struct bridge_iflist *bif; 1302 int error; 1303 1304 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1305 if (bif == NULL) 1306 return (ENOENT); 1307 1308 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1309 req->ifba_flags); 1310 1311 return (error); 1312 } 1313 1314 static int 1315 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1316 { 1317 struct ifbrparam *param = arg; 1318 1319 sc->sc_brttimeout = param->ifbrp_ctime; 1320 return (0); 1321 } 1322 1323 static int 1324 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1325 { 1326 struct ifbrparam *param = arg; 1327 1328 param->ifbrp_ctime = sc->sc_brttimeout; 1329 return (0); 1330 } 1331 1332 static int 1333 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1334 { 1335 struct ifbareq *req = arg; 1336 1337 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1338 } 1339 1340 static int 1341 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1342 { 1343 struct ifbreq *req = arg; 1344 1345 bridge_rtflush(sc, req->ifbr_ifsflags); 1346 return (0); 1347 } 1348 1349 static int 1350 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1351 { 1352 struct ifbrparam *param = arg; 1353 struct bstp_state *bs = &sc->sc_stp; 1354 1355 param->ifbrp_prio = bs->bs_bridge_priority; 1356 return (0); 1357 } 1358 1359 static int 1360 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1361 { 1362 struct ifbrparam *param = arg; 1363 1364 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1365 } 1366 1367 static int 1368 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1369 { 1370 struct ifbrparam *param = arg; 1371 struct bstp_state *bs = &sc->sc_stp; 1372 1373 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1374 return (0); 1375 } 1376 1377 static int 1378 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1379 { 1380 struct ifbrparam *param = arg; 1381 1382 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1383 } 1384 1385 static int 1386 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1387 { 1388 struct ifbrparam *param = arg; 1389 struct bstp_state *bs = &sc->sc_stp; 1390 1391 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1392 return (0); 1393 } 1394 1395 static int 1396 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1397 { 1398 struct ifbrparam *param = arg; 1399 1400 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1401 } 1402 1403 static int 1404 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1405 { 1406 struct ifbrparam *param = arg; 1407 struct bstp_state *bs = &sc->sc_stp; 1408 1409 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1410 return (0); 1411 } 1412 1413 static int 1414 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1415 { 1416 struct ifbrparam *param = arg; 1417 1418 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1419 } 1420 1421 static int 1422 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1423 { 1424 struct ifbreq *req = arg; 1425 struct bridge_iflist *bif; 1426 1427 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1428 if (bif == NULL) 1429 return (ENOENT); 1430 1431 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1432 } 1433 1434 static int 1435 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1436 { 1437 struct ifbreq *req = arg; 1438 struct bridge_iflist *bif; 1439 1440 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1441 if (bif == NULL) 1442 return (ENOENT); 1443 1444 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1445 } 1446 1447 static int 1448 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1449 { 1450 struct ifbreq *req = arg; 1451 struct bridge_iflist *bif; 1452 1453 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1454 if (bif == NULL) 1455 return (ENOENT); 1456 1457 bif->bif_addrmax = req->ifbr_addrmax; 1458 return (0); 1459 } 1460 1461 static int 1462 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1463 { 1464 struct ifbreq *req = arg; 1465 struct bridge_iflist *bif = NULL; 1466 struct ifnet *ifs; 1467 1468 ifs = ifunit(req->ifbr_ifsname); 1469 if (ifs == NULL) 1470 return (ENOENT); 1471 1472 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1473 if (ifs == bif->bif_ifp) 1474 return (EBUSY); 1475 1476 if (ifs->if_bridge != NULL) 1477 return (EBUSY); 1478 1479 switch (ifs->if_type) { 1480 case IFT_ETHER: 1481 case IFT_GIF: 1482 case IFT_L2VLAN: 1483 break; 1484 default: 1485 return (EINVAL); 1486 } 1487 1488 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1489 if (bif == NULL) 1490 return (ENOMEM); 1491 1492 bif->bif_ifp = ifs; 1493 bif->bif_flags = IFBIF_SPAN; 1494 1495 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1496 1497 return (0); 1498 } 1499 1500 static int 1501 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1502 { 1503 struct ifbreq *req = arg; 1504 struct bridge_iflist *bif; 1505 struct ifnet *ifs; 1506 1507 ifs = ifunit(req->ifbr_ifsname); 1508 if (ifs == NULL) 1509 return (ENOENT); 1510 1511 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1512 if (ifs == bif->bif_ifp) 1513 break; 1514 1515 if (bif == NULL) 1516 return (ENOENT); 1517 1518 bridge_delete_span(sc, bif); 1519 1520 return (0); 1521 } 1522 1523 static int 1524 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1525 { 1526 struct ifbropreq *req = arg; 1527 struct bstp_state *bs = &sc->sc_stp; 1528 struct bstp_port *root_port; 1529 1530 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1531 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1532 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1533 1534 root_port = bs->bs_root_port; 1535 if (root_port == NULL) 1536 req->ifbop_root_port = 0; 1537 else 1538 req->ifbop_root_port = root_port->bp_ifp->if_index; 1539 1540 req->ifbop_holdcount = bs->bs_txholdcount; 1541 req->ifbop_priority = bs->bs_bridge_priority; 1542 req->ifbop_protocol = bs->bs_protover; 1543 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1544 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1545 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1546 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1547 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1548 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1549 1550 return (0); 1551 } 1552 1553 static int 1554 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1555 { 1556 struct ifbrparam *param = arg; 1557 1558 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1559 return (0); 1560 } 1561 1562 static int 1563 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1564 { 1565 struct ifbpstpconf *bifstp = arg; 1566 struct bridge_iflist *bif; 1567 struct bstp_port *bp; 1568 struct ifbpstpreq bpreq; 1569 char *buf, *outbuf; 1570 int count, buflen, len, error = 0; 1571 1572 count = 0; 1573 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1574 if ((bif->bif_flags & IFBIF_STP) != 0) 1575 count++; 1576 } 1577 1578 buflen = sizeof(bpreq) * count; 1579 if (bifstp->ifbpstp_len == 0) { 1580 bifstp->ifbpstp_len = buflen; 1581 return (0); 1582 } 1583 1584 BRIDGE_UNLOCK(sc); 1585 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1586 BRIDGE_LOCK(sc); 1587 1588 count = 0; 1589 buf = outbuf; 1590 len = min(bifstp->ifbpstp_len, buflen); 1591 bzero(&bpreq, sizeof(bpreq)); 1592 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1593 if (len < sizeof(bpreq)) 1594 break; 1595 1596 if ((bif->bif_flags & IFBIF_STP) == 0) 1597 continue; 1598 1599 bp = &bif->bif_stp; 1600 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1601 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1602 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1603 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1604 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1605 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1606 1607 memcpy(buf, &bpreq, sizeof(bpreq)); 1608 count++; 1609 buf += sizeof(bpreq); 1610 len -= sizeof(bpreq); 1611 } 1612 1613 BRIDGE_UNLOCK(sc); 1614 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1615 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1616 BRIDGE_LOCK(sc); 1617 free(outbuf, M_TEMP); 1618 return (error); 1619 } 1620 1621 static int 1622 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1623 { 1624 struct ifbrparam *param = arg; 1625 1626 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1627 } 1628 1629 static int 1630 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1631 { 1632 struct ifbrparam *param = arg; 1633 1634 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1635 } 1636 1637 /* 1638 * bridge_ifdetach: 1639 * 1640 * Detach an interface from a bridge. Called when a member 1641 * interface is detaching. 1642 */ 1643 static void 1644 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1645 { 1646 struct bridge_softc *sc = ifp->if_bridge; 1647 struct bridge_iflist *bif; 1648 1649 /* Check if the interface is a bridge member */ 1650 if (sc != NULL) { 1651 BRIDGE_LOCK(sc); 1652 1653 bif = bridge_lookup_member_if(sc, ifp); 1654 if (bif != NULL) 1655 bridge_delete_member(sc, bif, 1); 1656 1657 BRIDGE_UNLOCK(sc); 1658 return; 1659 } 1660 1661 /* Check if the interface is a span port */ 1662 mtx_lock(&bridge_list_mtx); 1663 LIST_FOREACH(sc, &bridge_list, sc_list) { 1664 BRIDGE_LOCK(sc); 1665 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1666 if (ifp == bif->bif_ifp) { 1667 bridge_delete_span(sc, bif); 1668 break; 1669 } 1670 1671 BRIDGE_UNLOCK(sc); 1672 } 1673 mtx_unlock(&bridge_list_mtx); 1674 } 1675 1676 /* 1677 * bridge_init: 1678 * 1679 * Initialize a bridge interface. 1680 */ 1681 static void 1682 bridge_init(void *xsc) 1683 { 1684 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1685 struct ifnet *ifp = sc->sc_ifp; 1686 1687 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1688 return; 1689 1690 BRIDGE_LOCK(sc); 1691 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1692 bridge_timer, sc); 1693 1694 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1695 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1696 1697 BRIDGE_UNLOCK(sc); 1698 } 1699 1700 /* 1701 * bridge_stop: 1702 * 1703 * Stop the bridge interface. 1704 */ 1705 static void 1706 bridge_stop(struct ifnet *ifp, int disable) 1707 { 1708 struct bridge_softc *sc = ifp->if_softc; 1709 1710 BRIDGE_LOCK_ASSERT(sc); 1711 1712 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1713 return; 1714 1715 callout_stop(&sc->sc_brcallout); 1716 bstp_stop(&sc->sc_stp); 1717 1718 bridge_rtflush(sc, IFBF_FLUSHDYN); 1719 1720 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1721 } 1722 1723 /* 1724 * bridge_enqueue: 1725 * 1726 * Enqueue a packet on a bridge member interface. 1727 * 1728 */ 1729 static void 1730 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1731 { 1732 int len, err = 0; 1733 short mflags; 1734 struct mbuf *m0; 1735 1736 len = m->m_pkthdr.len; 1737 mflags = m->m_flags; 1738 1739 /* We may be sending a fragment so traverse the mbuf */ 1740 for (; m; m = m0) { 1741 m0 = m->m_nextpkt; 1742 m->m_nextpkt = NULL; 1743 1744 /* 1745 * If underlying interface can not do VLAN tag insertion itself 1746 * then attach a packet tag that holds it. 1747 */ 1748 if ((m->m_flags & M_VLANTAG) && 1749 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1750 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1751 if (m == NULL) { 1752 if_printf(dst_ifp, 1753 "unable to prepend VLAN header\n"); 1754 dst_ifp->if_oerrors++; 1755 continue; 1756 } 1757 m->m_flags &= ~M_VLANTAG; 1758 } 1759 1760 if (err == 0) 1761 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1762 } 1763 1764 if (err == 0) { 1765 1766 sc->sc_ifp->if_opackets++; 1767 sc->sc_ifp->if_obytes += len; 1768 1769 dst_ifp->if_obytes += len; 1770 1771 if (mflags & M_MCAST) { 1772 sc->sc_ifp->if_omcasts++; 1773 dst_ifp->if_omcasts++; 1774 } 1775 } 1776 1777 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1778 (*dst_ifp->if_start)(dst_ifp); 1779 } 1780 1781 /* 1782 * bridge_dummynet: 1783 * 1784 * Receive a queued packet from dummynet and pass it on to the output 1785 * interface. 1786 * 1787 * The mbuf has the Ethernet header already attached. 1788 */ 1789 static void 1790 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1791 { 1792 struct bridge_softc *sc; 1793 1794 sc = ifp->if_bridge; 1795 1796 /* 1797 * The packet didnt originate from a member interface. This should only 1798 * ever happen if a member interface is removed while packets are 1799 * queued for it. 1800 */ 1801 if (sc == NULL) { 1802 m_freem(m); 1803 return; 1804 } 1805 1806 if (PFIL_HOOKED(&inet_pfil_hook) 1807 #ifdef INET6 1808 || PFIL_HOOKED(&inet6_pfil_hook) 1809 #endif 1810 ) { 1811 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1812 return; 1813 if (m == NULL) 1814 return; 1815 } 1816 1817 bridge_enqueue(sc, ifp, m); 1818 } 1819 1820 /* 1821 * bridge_output: 1822 * 1823 * Send output from a bridge member interface. This 1824 * performs the bridging function for locally originated 1825 * packets. 1826 * 1827 * The mbuf has the Ethernet header already attached. We must 1828 * enqueue or free the mbuf before returning. 1829 */ 1830 static int 1831 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1832 struct rtentry *rt) 1833 { 1834 struct ether_header *eh; 1835 struct ifnet *dst_if; 1836 struct bridge_softc *sc; 1837 uint16_t vlan; 1838 1839 if (m->m_len < ETHER_HDR_LEN) { 1840 m = m_pullup(m, ETHER_HDR_LEN); 1841 if (m == NULL) 1842 return (0); 1843 } 1844 1845 eh = mtod(m, struct ether_header *); 1846 sc = ifp->if_bridge; 1847 vlan = VLANTAGOF(m); 1848 1849 BRIDGE_LOCK(sc); 1850 1851 /* 1852 * If bridge is down, but the original output interface is up, 1853 * go ahead and send out that interface. Otherwise, the packet 1854 * is dropped below. 1855 */ 1856 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1857 dst_if = ifp; 1858 goto sendunicast; 1859 } 1860 1861 /* 1862 * If the packet is a multicast, or we don't know a better way to 1863 * get there, send to all interfaces. 1864 */ 1865 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1866 dst_if = NULL; 1867 else 1868 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1869 if (dst_if == NULL) { 1870 struct bridge_iflist *bif; 1871 struct mbuf *mc; 1872 int error = 0, used = 0; 1873 1874 bridge_span(sc, m); 1875 1876 BRIDGE_LOCK2REF(sc, error); 1877 if (error) { 1878 m_freem(m); 1879 return (0); 1880 } 1881 1882 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1883 dst_if = bif->bif_ifp; 1884 1885 if (dst_if->if_type == IFT_GIF) 1886 continue; 1887 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1888 continue; 1889 1890 /* 1891 * If this is not the original output interface, 1892 * and the interface is participating in spanning 1893 * tree, make sure the port is in a state that 1894 * allows forwarding. 1895 */ 1896 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1897 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1898 continue; 1899 1900 if (LIST_NEXT(bif, bif_next) == NULL) { 1901 used = 1; 1902 mc = m; 1903 } else { 1904 mc = m_copypacket(m, M_DONTWAIT); 1905 if (mc == NULL) { 1906 sc->sc_ifp->if_oerrors++; 1907 continue; 1908 } 1909 } 1910 1911 bridge_enqueue(sc, dst_if, mc); 1912 } 1913 if (used == 0) 1914 m_freem(m); 1915 BRIDGE_UNREF(sc); 1916 return (0); 1917 } 1918 1919 sendunicast: 1920 /* 1921 * XXX Spanning tree consideration here? 1922 */ 1923 1924 bridge_span(sc, m); 1925 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1926 m_freem(m); 1927 BRIDGE_UNLOCK(sc); 1928 return (0); 1929 } 1930 1931 BRIDGE_UNLOCK(sc); 1932 bridge_enqueue(sc, dst_if, m); 1933 return (0); 1934 } 1935 1936 /* 1937 * bridge_start: 1938 * 1939 * Start output on a bridge. 1940 * 1941 */ 1942 static void 1943 bridge_start(struct ifnet *ifp) 1944 { 1945 struct bridge_softc *sc; 1946 struct mbuf *m; 1947 struct ether_header *eh; 1948 struct ifnet *dst_if; 1949 1950 sc = ifp->if_softc; 1951 1952 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1953 for (;;) { 1954 IFQ_DEQUEUE(&ifp->if_snd, m); 1955 if (m == 0) 1956 break; 1957 ETHER_BPF_MTAP(ifp, m); 1958 1959 eh = mtod(m, struct ether_header *); 1960 dst_if = NULL; 1961 1962 BRIDGE_LOCK(sc); 1963 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1964 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1965 } 1966 1967 if (dst_if == NULL) 1968 bridge_broadcast(sc, ifp, m, 0); 1969 else { 1970 BRIDGE_UNLOCK(sc); 1971 bridge_enqueue(sc, dst_if, m); 1972 } 1973 } 1974 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1975 } 1976 1977 /* 1978 * bridge_forward: 1979 * 1980 * The forwarding function of the bridge. 1981 * 1982 * NOTE: Releases the lock on return. 1983 */ 1984 static void 1985 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1986 struct mbuf *m) 1987 { 1988 struct bridge_iflist *dbif; 1989 struct ifnet *src_if, *dst_if, *ifp; 1990 struct ether_header *eh; 1991 uint16_t vlan; 1992 uint8_t *dst; 1993 int error; 1994 1995 src_if = m->m_pkthdr.rcvif; 1996 ifp = sc->sc_ifp; 1997 1998 ifp->if_ipackets++; 1999 ifp->if_ibytes += m->m_pkthdr.len; 2000 vlan = VLANTAGOF(m); 2001 2002 if ((sbif->bif_flags & IFBIF_STP) && 2003 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2004 goto drop; 2005 2006 eh = mtod(m, struct ether_header *); 2007 dst = eh->ether_dhost; 2008 2009 /* If the interface is learning, record the address. */ 2010 if (sbif->bif_flags & IFBIF_LEARNING) { 2011 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2012 sbif, 0, IFBAF_DYNAMIC); 2013 /* 2014 * If the interface has addresses limits then deny any source 2015 * that is not in the cache. 2016 */ 2017 if (error && sbif->bif_addrmax) 2018 goto drop; 2019 } 2020 2021 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2022 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2023 goto drop; 2024 2025 /* 2026 * At this point, the port either doesn't participate 2027 * in spanning tree or it is in the forwarding state. 2028 */ 2029 2030 /* 2031 * If the packet is unicast, destined for someone on 2032 * "this" side of the bridge, drop it. 2033 */ 2034 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2035 dst_if = bridge_rtlookup(sc, dst, vlan); 2036 if (src_if == dst_if) 2037 goto drop; 2038 } else { 2039 /* 2040 * Check if its a reserved multicast address, any address 2041 * listed in 802.1D section 7.12.6 may not be forwarded by the 2042 * bridge. 2043 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2044 */ 2045 if (dst[0] == 0x01 && dst[1] == 0x80 && 2046 dst[2] == 0xc2 && dst[3] == 0x00 && 2047 dst[4] == 0x00 && dst[5] <= 0x0f) 2048 goto drop; 2049 2050 /* ...forward it to all interfaces. */ 2051 ifp->if_imcasts++; 2052 dst_if = NULL; 2053 } 2054 2055 /* 2056 * If we have a destination interface which is a member of our bridge, 2057 * OR this is a unicast packet, push it through the bpf(4) machinery. 2058 * For broadcast or multicast packets, don't bother because it will 2059 * be reinjected into ether_input. We do this before we pass the packets 2060 * through the pfil(9) framework, as it is possible that pfil(9) will 2061 * drop the packet, or possibly modify it, making it difficult to debug 2062 * firewall issues on the bridge. 2063 */ 2064 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2065 ETHER_BPF_MTAP(ifp, m); 2066 2067 /* run the packet filter */ 2068 if (PFIL_HOOKED(&inet_pfil_hook) 2069 #ifdef INET6 2070 || PFIL_HOOKED(&inet6_pfil_hook) 2071 #endif 2072 ) { 2073 BRIDGE_UNLOCK(sc); 2074 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2075 return; 2076 if (m == NULL) 2077 return; 2078 BRIDGE_LOCK(sc); 2079 } 2080 2081 if (dst_if == NULL) { 2082 bridge_broadcast(sc, src_if, m, 1); 2083 return; 2084 } 2085 2086 /* 2087 * At this point, we're dealing with a unicast frame 2088 * going to a different interface. 2089 */ 2090 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2091 goto drop; 2092 2093 dbif = bridge_lookup_member_if(sc, dst_if); 2094 if (dbif == NULL) 2095 /* Not a member of the bridge (anymore?) */ 2096 goto drop; 2097 2098 /* Private segments can not talk to each other */ 2099 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2100 goto drop; 2101 2102 if ((dbif->bif_flags & IFBIF_STP) && 2103 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2104 goto drop; 2105 2106 BRIDGE_UNLOCK(sc); 2107 2108 if (PFIL_HOOKED(&inet_pfil_hook) 2109 #ifdef INET6 2110 || PFIL_HOOKED(&inet6_pfil_hook) 2111 #endif 2112 ) { 2113 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2114 return; 2115 if (m == NULL) 2116 return; 2117 } 2118 2119 bridge_enqueue(sc, dst_if, m); 2120 return; 2121 2122 drop: 2123 BRIDGE_UNLOCK(sc); 2124 m_freem(m); 2125 } 2126 2127 /* 2128 * bridge_input: 2129 * 2130 * Receive input from a member interface. Queue the packet for 2131 * bridging if it is not for us. 2132 */ 2133 static struct mbuf * 2134 bridge_input(struct ifnet *ifp, struct mbuf *m) 2135 { 2136 struct bridge_softc *sc = ifp->if_bridge; 2137 struct bridge_iflist *bif, *bif2; 2138 struct ifnet *bifp; 2139 struct ether_header *eh; 2140 struct mbuf *mc, *mc2; 2141 uint16_t vlan; 2142 int error; 2143 2144 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2145 return (m); 2146 2147 bifp = sc->sc_ifp; 2148 vlan = VLANTAGOF(m); 2149 2150 /* 2151 * Implement support for bridge monitoring. If this flag has been 2152 * set on this interface, discard the packet once we push it through 2153 * the bpf(4) machinery, but before we do, increment the byte and 2154 * packet counters associated with this interface. 2155 */ 2156 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2157 m->m_pkthdr.rcvif = bifp; 2158 ETHER_BPF_MTAP(bifp, m); 2159 bifp->if_ipackets++; 2160 bifp->if_ibytes += m->m_pkthdr.len; 2161 m_freem(m); 2162 return (NULL); 2163 } 2164 BRIDGE_LOCK(sc); 2165 bif = bridge_lookup_member_if(sc, ifp); 2166 if (bif == NULL) { 2167 BRIDGE_UNLOCK(sc); 2168 return (m); 2169 } 2170 2171 eh = mtod(m, struct ether_header *); 2172 2173 bridge_span(sc, m); 2174 2175 if (m->m_flags & (M_BCAST|M_MCAST)) { 2176 /* Tap off 802.1D packets; they do not get forwarded. */ 2177 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2178 ETHER_ADDR_LEN) == 0) { 2179 m = bstp_input(&bif->bif_stp, ifp, m); 2180 if (m == NULL) { 2181 BRIDGE_UNLOCK(sc); 2182 return (NULL); 2183 } 2184 } 2185 2186 if ((bif->bif_flags & IFBIF_STP) && 2187 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2188 BRIDGE_UNLOCK(sc); 2189 return (m); 2190 } 2191 2192 /* 2193 * Make a deep copy of the packet and enqueue the copy 2194 * for bridge processing; return the original packet for 2195 * local processing. 2196 */ 2197 mc = m_dup(m, M_DONTWAIT); 2198 if (mc == NULL) { 2199 BRIDGE_UNLOCK(sc); 2200 return (m); 2201 } 2202 2203 /* Perform the bridge forwarding function with the copy. */ 2204 bridge_forward(sc, bif, mc); 2205 2206 /* 2207 * Reinject the mbuf as arriving on the bridge so we have a 2208 * chance at claiming multicast packets. We can not loop back 2209 * here from ether_input as a bridge is never a member of a 2210 * bridge. 2211 */ 2212 KASSERT(bifp->if_bridge == NULL, 2213 ("loop created in bridge_input")); 2214 mc2 = m_dup(m, M_DONTWAIT); 2215 if (mc2 != NULL) { 2216 /* Keep the layer3 header aligned */ 2217 int i = min(mc2->m_pkthdr.len, max_protohdr); 2218 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2219 } 2220 if (mc2 != NULL) { 2221 mc2->m_pkthdr.rcvif = bifp; 2222 (*bifp->if_input)(bifp, mc2); 2223 } 2224 2225 /* Return the original packet for local processing. */ 2226 return (m); 2227 } 2228 2229 if ((bif->bif_flags & IFBIF_STP) && 2230 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2231 BRIDGE_UNLOCK(sc); 2232 return (m); 2233 } 2234 2235 #ifdef DEV_CARP 2236 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2237 || ((iface)->if_carp \ 2238 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2239 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2240 || ((iface)->if_carp \ 2241 && carp_forus((iface)->if_carp, eh->ether_shost)) 2242 #else 2243 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2244 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2245 #endif 2246 2247 #ifdef INET6 2248 # define OR_PFIL_HOOKED_INET6 \ 2249 || PFIL_HOOKED(&inet6_pfil_hook) 2250 #else 2251 # define OR_PFIL_HOOKED_INET6 2252 #endif 2253 2254 #define GRAB_OUR_PACKETS(iface) \ 2255 if ((iface)->if_type == IFT_GIF) \ 2256 continue; \ 2257 /* It is destined for us. */ \ 2258 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2259 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2260 ) { \ 2261 if ((iface)->if_type == IFT_BRIDGE) { \ 2262 ETHER_BPF_MTAP(iface, m); \ 2263 iface->if_ipackets++; \ 2264 /* Filter on the physical interface. */ \ 2265 if (pfil_local_phys && \ 2266 (PFIL_HOOKED(&inet_pfil_hook) \ 2267 OR_PFIL_HOOKED_INET6)) { \ 2268 if (bridge_pfil(&m, NULL, ifp, \ 2269 PFIL_IN) != 0 || m == NULL) { \ 2270 BRIDGE_UNLOCK(sc); \ 2271 return (NULL); \ 2272 } \ 2273 } \ 2274 } \ 2275 if (bif->bif_flags & IFBIF_LEARNING) { \ 2276 error = bridge_rtupdate(sc, eh->ether_shost, \ 2277 vlan, bif, 0, IFBAF_DYNAMIC); \ 2278 if (error && bif->bif_addrmax) { \ 2279 BRIDGE_UNLOCK(sc); \ 2280 m_freem(m); \ 2281 return (NULL); \ 2282 } \ 2283 } \ 2284 m->m_pkthdr.rcvif = iface; \ 2285 BRIDGE_UNLOCK(sc); \ 2286 return (m); \ 2287 } \ 2288 \ 2289 /* We just received a packet that we sent out. */ \ 2290 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2291 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2292 ) { \ 2293 BRIDGE_UNLOCK(sc); \ 2294 m_freem(m); \ 2295 return (NULL); \ 2296 } 2297 2298 /* 2299 * Unicast. Make sure it's not for the bridge. 2300 */ 2301 do { GRAB_OUR_PACKETS(bifp) } while (0); 2302 2303 /* 2304 * Give a chance for ifp at first priority. This will help when the 2305 * packet comes through the interface like VLAN's with the same MACs 2306 * on several interfaces from the same bridge. This also will save 2307 * some CPU cycles in case the destination interface and the input 2308 * interface (eq ifp) are the same. 2309 */ 2310 do { GRAB_OUR_PACKETS(ifp) } while (0); 2311 2312 /* Now check the all bridge members. */ 2313 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2314 GRAB_OUR_PACKETS(bif2->bif_ifp) 2315 } 2316 2317 #undef OR_CARP_CHECK_WE_ARE_DST 2318 #undef OR_CARP_CHECK_WE_ARE_SRC 2319 #undef OR_PFIL_HOOKED_INET6 2320 #undef GRAB_OUR_PACKETS 2321 2322 /* Perform the bridge forwarding function. */ 2323 bridge_forward(sc, bif, m); 2324 2325 return (NULL); 2326 } 2327 2328 /* 2329 * bridge_broadcast: 2330 * 2331 * Send a frame to all interfaces that are members of 2332 * the bridge, except for the one on which the packet 2333 * arrived. 2334 * 2335 * NOTE: Releases the lock on return. 2336 */ 2337 static void 2338 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2339 struct mbuf *m, int runfilt) 2340 { 2341 struct bridge_iflist *dbif, *sbif; 2342 struct mbuf *mc; 2343 struct ifnet *dst_if; 2344 int error = 0, used = 0, i; 2345 2346 sbif = bridge_lookup_member_if(sc, src_if); 2347 2348 BRIDGE_LOCK2REF(sc, error); 2349 if (error) { 2350 m_freem(m); 2351 return; 2352 } 2353 2354 /* Filter on the bridge interface before broadcasting */ 2355 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2356 #ifdef INET6 2357 || PFIL_HOOKED(&inet6_pfil_hook) 2358 #endif 2359 )) { 2360 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2361 goto out; 2362 if (m == NULL) 2363 goto out; 2364 } 2365 2366 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2367 dst_if = dbif->bif_ifp; 2368 if (dst_if == src_if) 2369 continue; 2370 2371 /* Private segments can not talk to each other */ 2372 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2373 continue; 2374 2375 if ((dbif->bif_flags & IFBIF_STP) && 2376 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2377 continue; 2378 2379 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2380 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2381 continue; 2382 2383 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2384 continue; 2385 2386 if (LIST_NEXT(dbif, bif_next) == NULL) { 2387 mc = m; 2388 used = 1; 2389 } else { 2390 mc = m_dup(m, M_DONTWAIT); 2391 if (mc == NULL) { 2392 sc->sc_ifp->if_oerrors++; 2393 continue; 2394 } 2395 } 2396 2397 /* 2398 * Filter on the output interface. Pass a NULL bridge interface 2399 * pointer so we do not redundantly filter on the bridge for 2400 * each interface we broadcast on. 2401 */ 2402 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2403 #ifdef INET6 2404 || PFIL_HOOKED(&inet6_pfil_hook) 2405 #endif 2406 )) { 2407 if (used == 0) { 2408 /* Keep the layer3 header aligned */ 2409 i = min(mc->m_pkthdr.len, max_protohdr); 2410 mc = m_copyup(mc, i, ETHER_ALIGN); 2411 if (mc == NULL) { 2412 sc->sc_ifp->if_oerrors++; 2413 continue; 2414 } 2415 } 2416 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2417 continue; 2418 if (mc == NULL) 2419 continue; 2420 } 2421 2422 bridge_enqueue(sc, dst_if, mc); 2423 } 2424 if (used == 0) 2425 m_freem(m); 2426 2427 out: 2428 BRIDGE_UNREF(sc); 2429 } 2430 2431 /* 2432 * bridge_span: 2433 * 2434 * Duplicate a packet out one or more interfaces that are in span mode, 2435 * the original mbuf is unmodified. 2436 */ 2437 static void 2438 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2439 { 2440 struct bridge_iflist *bif; 2441 struct ifnet *dst_if; 2442 struct mbuf *mc; 2443 2444 if (LIST_EMPTY(&sc->sc_spanlist)) 2445 return; 2446 2447 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2448 dst_if = bif->bif_ifp; 2449 2450 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2451 continue; 2452 2453 mc = m_copypacket(m, M_DONTWAIT); 2454 if (mc == NULL) { 2455 sc->sc_ifp->if_oerrors++; 2456 continue; 2457 } 2458 2459 bridge_enqueue(sc, dst_if, mc); 2460 } 2461 } 2462 2463 /* 2464 * bridge_rtupdate: 2465 * 2466 * Add a bridge routing entry. 2467 */ 2468 static int 2469 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2470 struct bridge_iflist *bif, int setflags, uint8_t flags) 2471 { 2472 struct bridge_rtnode *brt; 2473 int error; 2474 2475 BRIDGE_LOCK_ASSERT(sc); 2476 2477 /* Check the source address is valid and not multicast. */ 2478 if (ETHER_IS_MULTICAST(dst) || 2479 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2480 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2481 return (EINVAL); 2482 2483 /* 802.1p frames map to vlan 1 */ 2484 if (vlan == 0) 2485 vlan = 1; 2486 2487 /* 2488 * A route for this destination might already exist. If so, 2489 * update it, otherwise create a new one. 2490 */ 2491 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2492 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2493 sc->sc_brtexceeded++; 2494 return (ENOSPC); 2495 } 2496 /* Check per interface address limits (if enabled) */ 2497 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2498 bif->bif_addrexceeded++; 2499 return (ENOSPC); 2500 } 2501 2502 /* 2503 * Allocate a new bridge forwarding node, and 2504 * initialize the expiration time and Ethernet 2505 * address. 2506 */ 2507 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2508 if (brt == NULL) 2509 return (ENOMEM); 2510 2511 if (bif->bif_flags & IFBIF_STICKY) 2512 brt->brt_flags = IFBAF_STICKY; 2513 else 2514 brt->brt_flags = IFBAF_DYNAMIC; 2515 2516 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2517 brt->brt_vlan = vlan; 2518 2519 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2520 uma_zfree(bridge_rtnode_zone, brt); 2521 return (error); 2522 } 2523 brt->brt_dst = bif; 2524 bif->bif_addrcnt++; 2525 } 2526 2527 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2528 brt->brt_dst != bif) { 2529 brt->brt_dst->bif_addrcnt--; 2530 brt->brt_dst = bif; 2531 brt->brt_dst->bif_addrcnt++; 2532 } 2533 2534 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2535 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2536 if (setflags) 2537 brt->brt_flags = flags; 2538 2539 return (0); 2540 } 2541 2542 /* 2543 * bridge_rtlookup: 2544 * 2545 * Lookup the destination interface for an address. 2546 */ 2547 static struct ifnet * 2548 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2549 { 2550 struct bridge_rtnode *brt; 2551 2552 BRIDGE_LOCK_ASSERT(sc); 2553 2554 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2555 return (NULL); 2556 2557 return (brt->brt_ifp); 2558 } 2559 2560 /* 2561 * bridge_rttrim: 2562 * 2563 * Trim the routine table so that we have a number 2564 * of routing entries less than or equal to the 2565 * maximum number. 2566 */ 2567 static void 2568 bridge_rttrim(struct bridge_softc *sc) 2569 { 2570 struct bridge_rtnode *brt, *nbrt; 2571 2572 BRIDGE_LOCK_ASSERT(sc); 2573 2574 /* Make sure we actually need to do this. */ 2575 if (sc->sc_brtcnt <= sc->sc_brtmax) 2576 return; 2577 2578 /* Force an aging cycle; this might trim enough addresses. */ 2579 bridge_rtage(sc); 2580 if (sc->sc_brtcnt <= sc->sc_brtmax) 2581 return; 2582 2583 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2584 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2585 bridge_rtnode_destroy(sc, brt); 2586 if (sc->sc_brtcnt <= sc->sc_brtmax) 2587 return; 2588 } 2589 } 2590 } 2591 2592 /* 2593 * bridge_timer: 2594 * 2595 * Aging timer for the bridge. 2596 */ 2597 static void 2598 bridge_timer(void *arg) 2599 { 2600 struct bridge_softc *sc = arg; 2601 2602 BRIDGE_LOCK_ASSERT(sc); 2603 2604 bridge_rtage(sc); 2605 2606 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2607 callout_reset(&sc->sc_brcallout, 2608 bridge_rtable_prune_period * hz, bridge_timer, sc); 2609 } 2610 2611 /* 2612 * bridge_rtage: 2613 * 2614 * Perform an aging cycle. 2615 */ 2616 static void 2617 bridge_rtage(struct bridge_softc *sc) 2618 { 2619 struct bridge_rtnode *brt, *nbrt; 2620 2621 BRIDGE_LOCK_ASSERT(sc); 2622 2623 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2624 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2625 if (time_uptime >= brt->brt_expire) 2626 bridge_rtnode_destroy(sc, brt); 2627 } 2628 } 2629 } 2630 2631 /* 2632 * bridge_rtflush: 2633 * 2634 * Remove all dynamic addresses from the bridge. 2635 */ 2636 static void 2637 bridge_rtflush(struct bridge_softc *sc, int full) 2638 { 2639 struct bridge_rtnode *brt, *nbrt; 2640 2641 BRIDGE_LOCK_ASSERT(sc); 2642 2643 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2644 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2645 bridge_rtnode_destroy(sc, brt); 2646 } 2647 } 2648 2649 /* 2650 * bridge_rtdaddr: 2651 * 2652 * Remove an address from the table. 2653 */ 2654 static int 2655 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2656 { 2657 struct bridge_rtnode *brt; 2658 int found = 0; 2659 2660 BRIDGE_LOCK_ASSERT(sc); 2661 2662 /* 2663 * If vlan is zero then we want to delete for all vlans so the lookup 2664 * may return more than one. 2665 */ 2666 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2667 bridge_rtnode_destroy(sc, brt); 2668 found = 1; 2669 } 2670 2671 return (found ? 0 : ENOENT); 2672 } 2673 2674 /* 2675 * bridge_rtdelete: 2676 * 2677 * Delete routes to a speicifc member interface. 2678 */ 2679 static void 2680 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2681 { 2682 struct bridge_rtnode *brt, *nbrt; 2683 2684 BRIDGE_LOCK_ASSERT(sc); 2685 2686 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2687 if (brt->brt_ifp == ifp && (full || 2688 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2689 bridge_rtnode_destroy(sc, brt); 2690 } 2691 } 2692 2693 /* 2694 * bridge_rtable_init: 2695 * 2696 * Initialize the route table for this bridge. 2697 */ 2698 static int 2699 bridge_rtable_init(struct bridge_softc *sc) 2700 { 2701 int i; 2702 2703 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2704 M_DEVBUF, M_NOWAIT); 2705 if (sc->sc_rthash == NULL) 2706 return (ENOMEM); 2707 2708 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2709 LIST_INIT(&sc->sc_rthash[i]); 2710 2711 sc->sc_rthash_key = arc4random(); 2712 2713 LIST_INIT(&sc->sc_rtlist); 2714 2715 return (0); 2716 } 2717 2718 /* 2719 * bridge_rtable_fini: 2720 * 2721 * Deconstruct the route table for this bridge. 2722 */ 2723 static void 2724 bridge_rtable_fini(struct bridge_softc *sc) 2725 { 2726 2727 KASSERT(sc->sc_brtcnt == 0, 2728 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2729 free(sc->sc_rthash, M_DEVBUF); 2730 } 2731 2732 /* 2733 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2734 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2735 */ 2736 #define mix(a, b, c) \ 2737 do { \ 2738 a -= b; a -= c; a ^= (c >> 13); \ 2739 b -= c; b -= a; b ^= (a << 8); \ 2740 c -= a; c -= b; c ^= (b >> 13); \ 2741 a -= b; a -= c; a ^= (c >> 12); \ 2742 b -= c; b -= a; b ^= (a << 16); \ 2743 c -= a; c -= b; c ^= (b >> 5); \ 2744 a -= b; a -= c; a ^= (c >> 3); \ 2745 b -= c; b -= a; b ^= (a << 10); \ 2746 c -= a; c -= b; c ^= (b >> 15); \ 2747 } while (/*CONSTCOND*/0) 2748 2749 static __inline uint32_t 2750 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2751 { 2752 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2753 2754 b += addr[5] << 8; 2755 b += addr[4]; 2756 a += addr[3] << 24; 2757 a += addr[2] << 16; 2758 a += addr[1] << 8; 2759 a += addr[0]; 2760 2761 mix(a, b, c); 2762 2763 return (c & BRIDGE_RTHASH_MASK); 2764 } 2765 2766 #undef mix 2767 2768 static int 2769 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2770 { 2771 int i, d; 2772 2773 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2774 d = ((int)a[i]) - ((int)b[i]); 2775 } 2776 2777 return (d); 2778 } 2779 2780 /* 2781 * bridge_rtnode_lookup: 2782 * 2783 * Look up a bridge route node for the specified destination. Compare the 2784 * vlan id or if zero then just return the first match. 2785 */ 2786 static struct bridge_rtnode * 2787 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2788 { 2789 struct bridge_rtnode *brt; 2790 uint32_t hash; 2791 int dir; 2792 2793 BRIDGE_LOCK_ASSERT(sc); 2794 2795 hash = bridge_rthash(sc, addr); 2796 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2797 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2798 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2799 return (brt); 2800 if (dir > 0) 2801 return (NULL); 2802 } 2803 2804 return (NULL); 2805 } 2806 2807 /* 2808 * bridge_rtnode_insert: 2809 * 2810 * Insert the specified bridge node into the route table. We 2811 * assume the entry is not already in the table. 2812 */ 2813 static int 2814 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2815 { 2816 struct bridge_rtnode *lbrt; 2817 uint32_t hash; 2818 int dir; 2819 2820 BRIDGE_LOCK_ASSERT(sc); 2821 2822 hash = bridge_rthash(sc, brt->brt_addr); 2823 2824 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2825 if (lbrt == NULL) { 2826 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2827 goto out; 2828 } 2829 2830 do { 2831 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2832 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2833 return (EEXIST); 2834 if (dir > 0) { 2835 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2836 goto out; 2837 } 2838 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2839 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2840 goto out; 2841 } 2842 lbrt = LIST_NEXT(lbrt, brt_hash); 2843 } while (lbrt != NULL); 2844 2845 #ifdef DIAGNOSTIC 2846 panic("bridge_rtnode_insert: impossible"); 2847 #endif 2848 2849 out: 2850 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2851 sc->sc_brtcnt++; 2852 2853 return (0); 2854 } 2855 2856 /* 2857 * bridge_rtnode_destroy: 2858 * 2859 * Destroy a bridge rtnode. 2860 */ 2861 static void 2862 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2863 { 2864 BRIDGE_LOCK_ASSERT(sc); 2865 2866 LIST_REMOVE(brt, brt_hash); 2867 2868 LIST_REMOVE(brt, brt_list); 2869 sc->sc_brtcnt--; 2870 brt->brt_dst->bif_addrcnt--; 2871 uma_zfree(bridge_rtnode_zone, brt); 2872 } 2873 2874 /* 2875 * bridge_rtable_expire: 2876 * 2877 * Set the expiry time for all routes on an interface. 2878 */ 2879 static void 2880 bridge_rtable_expire(struct ifnet *ifp, int age) 2881 { 2882 struct bridge_softc *sc = ifp->if_bridge; 2883 struct bridge_rtnode *brt; 2884 2885 BRIDGE_LOCK(sc); 2886 2887 /* 2888 * If the age is zero then flush, otherwise set all the expiry times to 2889 * age for the interface 2890 */ 2891 if (age == 0) 2892 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2893 else { 2894 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2895 /* Cap the expiry time to 'age' */ 2896 if (brt->brt_ifp == ifp && 2897 brt->brt_expire > time_uptime + age && 2898 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2899 brt->brt_expire = time_uptime + age; 2900 } 2901 } 2902 BRIDGE_UNLOCK(sc); 2903 } 2904 2905 /* 2906 * bridge_state_change: 2907 * 2908 * Callback from the bridgestp code when a port changes states. 2909 */ 2910 static void 2911 bridge_state_change(struct ifnet *ifp, int state) 2912 { 2913 struct bridge_softc *sc = ifp->if_bridge; 2914 static const char *stpstates[] = { 2915 "disabled", 2916 "listening", 2917 "learning", 2918 "forwarding", 2919 "blocking", 2920 "discarding" 2921 }; 2922 2923 if (log_stp) 2924 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2925 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2926 } 2927 2928 /* 2929 * Send bridge packets through pfil if they are one of the types pfil can deal 2930 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2931 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2932 * that interface. 2933 */ 2934 static int 2935 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2936 { 2937 int snap, error, i, hlen; 2938 struct ether_header *eh1, eh2; 2939 struct ip_fw_args args; 2940 struct ip *ip; 2941 struct llc llc1; 2942 u_int16_t ether_type; 2943 2944 snap = 0; 2945 error = -1; /* Default error if not error == 0 */ 2946 2947 #if 0 2948 /* we may return with the IP fields swapped, ensure its not shared */ 2949 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2950 #endif 2951 2952 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2953 return (0); /* filtering is disabled */ 2954 2955 i = min((*mp)->m_pkthdr.len, max_protohdr); 2956 if ((*mp)->m_len < i) { 2957 *mp = m_pullup(*mp, i); 2958 if (*mp == NULL) { 2959 printf("%s: m_pullup failed\n", __func__); 2960 return (-1); 2961 } 2962 } 2963 2964 eh1 = mtod(*mp, struct ether_header *); 2965 ether_type = ntohs(eh1->ether_type); 2966 2967 /* 2968 * Check for SNAP/LLC. 2969 */ 2970 if (ether_type < ETHERMTU) { 2971 struct llc *llc2 = (struct llc *)(eh1 + 1); 2972 2973 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2974 llc2->llc_dsap == LLC_SNAP_LSAP && 2975 llc2->llc_ssap == LLC_SNAP_LSAP && 2976 llc2->llc_control == LLC_UI) { 2977 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2978 snap = 1; 2979 } 2980 } 2981 2982 /* 2983 * If we're trying to filter bridge traffic, don't look at anything 2984 * other than IP and ARP traffic. If the filter doesn't understand 2985 * IPv6, don't allow IPv6 through the bridge either. This is lame 2986 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2987 * but of course we don't have an AppleTalk filter to begin with. 2988 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2989 * ARP traffic.) 2990 */ 2991 switch (ether_type) { 2992 case ETHERTYPE_ARP: 2993 case ETHERTYPE_REVARP: 2994 if (pfil_ipfw_arp == 0) 2995 return (0); /* Automatically pass */ 2996 break; 2997 2998 case ETHERTYPE_IP: 2999 #ifdef INET6 3000 case ETHERTYPE_IPV6: 3001 #endif /* INET6 */ 3002 break; 3003 default: 3004 /* 3005 * Check to see if the user wants to pass non-ip 3006 * packets, these will not be checked by pfil(9) and 3007 * passed unconditionally so the default is to drop. 3008 */ 3009 if (pfil_onlyip) 3010 goto bad; 3011 } 3012 3013 /* Strip off the Ethernet header and keep a copy. */ 3014 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3015 m_adj(*mp, ETHER_HDR_LEN); 3016 3017 /* Strip off snap header, if present */ 3018 if (snap) { 3019 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3020 m_adj(*mp, sizeof(struct llc)); 3021 } 3022 3023 /* 3024 * Check the IP header for alignment and errors 3025 */ 3026 if (dir == PFIL_IN) { 3027 switch (ether_type) { 3028 case ETHERTYPE_IP: 3029 error = bridge_ip_checkbasic(mp); 3030 break; 3031 #ifdef INET6 3032 case ETHERTYPE_IPV6: 3033 error = bridge_ip6_checkbasic(mp); 3034 break; 3035 #endif /* INET6 */ 3036 default: 3037 error = 0; 3038 } 3039 if (error) 3040 goto bad; 3041 } 3042 3043 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3044 INIT_VNET_IPFW(curvnet); 3045 3046 error = -1; 3047 args.rule = ip_dn_claim_rule(*mp); 3048 if (args.rule != NULL && V_fw_one_pass) 3049 goto ipfwpass; /* packet already partially processed */ 3050 3051 args.m = *mp; 3052 args.oif = ifp; 3053 args.next_hop = NULL; 3054 args.eh = &eh2; 3055 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3056 i = ip_fw_chk_ptr(&args); 3057 *mp = args.m; 3058 3059 if (*mp == NULL) 3060 return (error); 3061 3062 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 3063 3064 /* put the Ethernet header back on */ 3065 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3066 if (*mp == NULL) 3067 return (error); 3068 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3069 3070 /* 3071 * Pass the pkt to dummynet, which consumes it. The 3072 * packet will return to us via bridge_dummynet(). 3073 */ 3074 args.oif = ifp; 3075 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3076 return (error); 3077 } 3078 3079 if (i != IP_FW_PASS) /* drop */ 3080 goto bad; 3081 } 3082 3083 ipfwpass: 3084 error = 0; 3085 3086 /* 3087 * Run the packet through pfil 3088 */ 3089 switch (ether_type) { 3090 case ETHERTYPE_IP: 3091 /* 3092 * before calling the firewall, swap fields the same as 3093 * IP does. here we assume the header is contiguous 3094 */ 3095 ip = mtod(*mp, struct ip *); 3096 3097 ip->ip_len = ntohs(ip->ip_len); 3098 ip->ip_off = ntohs(ip->ip_off); 3099 3100 /* 3101 * Run pfil on the member interface and the bridge, both can 3102 * be skipped by clearing pfil_member or pfil_bridge. 3103 * 3104 * Keep the order: 3105 * in_if -> bridge_if -> out_if 3106 */ 3107 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3108 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3109 dir, NULL); 3110 3111 if (*mp == NULL || error != 0) /* filter may consume */ 3112 break; 3113 3114 if (pfil_member && ifp != NULL) 3115 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3116 dir, NULL); 3117 3118 if (*mp == NULL || error != 0) /* filter may consume */ 3119 break; 3120 3121 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3122 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3123 dir, NULL); 3124 3125 if (*mp == NULL || error != 0) /* filter may consume */ 3126 break; 3127 3128 /* check if we need to fragment the packet */ 3129 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3130 i = (*mp)->m_pkthdr.len; 3131 if (i > ifp->if_mtu) { 3132 error = bridge_fragment(ifp, *mp, &eh2, snap, 3133 &llc1); 3134 return (error); 3135 } 3136 } 3137 3138 /* Recalculate the ip checksum and restore byte ordering */ 3139 ip = mtod(*mp, struct ip *); 3140 hlen = ip->ip_hl << 2; 3141 if (hlen < sizeof(struct ip)) 3142 goto bad; 3143 if (hlen > (*mp)->m_len) { 3144 if ((*mp = m_pullup(*mp, hlen)) == 0) 3145 goto bad; 3146 ip = mtod(*mp, struct ip *); 3147 if (ip == NULL) 3148 goto bad; 3149 } 3150 ip->ip_len = htons(ip->ip_len); 3151 ip->ip_off = htons(ip->ip_off); 3152 ip->ip_sum = 0; 3153 if (hlen == sizeof(struct ip)) 3154 ip->ip_sum = in_cksum_hdr(ip); 3155 else 3156 ip->ip_sum = in_cksum(*mp, hlen); 3157 3158 break; 3159 #ifdef INET6 3160 case ETHERTYPE_IPV6: 3161 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3162 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3163 dir, NULL); 3164 3165 if (*mp == NULL || error != 0) /* filter may consume */ 3166 break; 3167 3168 if (pfil_member && ifp != NULL) 3169 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3170 dir, NULL); 3171 3172 if (*mp == NULL || error != 0) /* filter may consume */ 3173 break; 3174 3175 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3176 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3177 dir, NULL); 3178 break; 3179 #endif 3180 default: 3181 error = 0; 3182 break; 3183 } 3184 3185 if (*mp == NULL) 3186 return (error); 3187 if (error != 0) 3188 goto bad; 3189 3190 error = -1; 3191 3192 /* 3193 * Finally, put everything back the way it was and return 3194 */ 3195 if (snap) { 3196 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3197 if (*mp == NULL) 3198 return (error); 3199 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3200 } 3201 3202 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3203 if (*mp == NULL) 3204 return (error); 3205 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3206 3207 return (0); 3208 3209 bad: 3210 m_freem(*mp); 3211 *mp = NULL; 3212 return (error); 3213 } 3214 3215 /* 3216 * Perform basic checks on header size since 3217 * pfil assumes ip_input has already processed 3218 * it for it. Cut-and-pasted from ip_input.c. 3219 * Given how simple the IPv6 version is, 3220 * does the IPv4 version really need to be 3221 * this complicated? 3222 * 3223 * XXX Should we update ipstat here, or not? 3224 * XXX Right now we update ipstat but not 3225 * XXX csum_counter. 3226 */ 3227 static int 3228 bridge_ip_checkbasic(struct mbuf **mp) 3229 { 3230 INIT_VNET_INET(curvnet); 3231 struct mbuf *m = *mp; 3232 struct ip *ip; 3233 int len, hlen; 3234 u_short sum; 3235 3236 if (*mp == NULL) 3237 return (-1); 3238 3239 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3240 if ((m = m_copyup(m, sizeof(struct ip), 3241 (max_linkhdr + 3) & ~3)) == NULL) { 3242 /* XXXJRT new stat, please */ 3243 V_ipstat.ips_toosmall++; 3244 goto bad; 3245 } 3246 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3247 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3248 V_ipstat.ips_toosmall++; 3249 goto bad; 3250 } 3251 } 3252 ip = mtod(m, struct ip *); 3253 if (ip == NULL) goto bad; 3254 3255 if (ip->ip_v != IPVERSION) { 3256 V_ipstat.ips_badvers++; 3257 goto bad; 3258 } 3259 hlen = ip->ip_hl << 2; 3260 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3261 V_ipstat.ips_badhlen++; 3262 goto bad; 3263 } 3264 if (hlen > m->m_len) { 3265 if ((m = m_pullup(m, hlen)) == 0) { 3266 V_ipstat.ips_badhlen++; 3267 goto bad; 3268 } 3269 ip = mtod(m, struct ip *); 3270 if (ip == NULL) goto bad; 3271 } 3272 3273 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3274 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3275 } else { 3276 if (hlen == sizeof(struct ip)) { 3277 sum = in_cksum_hdr(ip); 3278 } else { 3279 sum = in_cksum(m, hlen); 3280 } 3281 } 3282 if (sum) { 3283 V_ipstat.ips_badsum++; 3284 goto bad; 3285 } 3286 3287 /* Retrieve the packet length. */ 3288 len = ntohs(ip->ip_len); 3289 3290 /* 3291 * Check for additional length bogosity 3292 */ 3293 if (len < hlen) { 3294 V_ipstat.ips_badlen++; 3295 goto bad; 3296 } 3297 3298 /* 3299 * Check that the amount of data in the buffers 3300 * is as at least much as the IP header would have us expect. 3301 * Drop packet if shorter than we expect. 3302 */ 3303 if (m->m_pkthdr.len < len) { 3304 V_ipstat.ips_tooshort++; 3305 goto bad; 3306 } 3307 3308 /* Checks out, proceed */ 3309 *mp = m; 3310 return (0); 3311 3312 bad: 3313 *mp = m; 3314 return (-1); 3315 } 3316 3317 #ifdef INET6 3318 /* 3319 * Same as above, but for IPv6. 3320 * Cut-and-pasted from ip6_input.c. 3321 * XXX Should we update ip6stat, or not? 3322 */ 3323 static int 3324 bridge_ip6_checkbasic(struct mbuf **mp) 3325 { 3326 INIT_VNET_INET6(curvnet); 3327 struct mbuf *m = *mp; 3328 struct ip6_hdr *ip6; 3329 3330 /* 3331 * If the IPv6 header is not aligned, slurp it up into a new 3332 * mbuf with space for link headers, in the event we forward 3333 * it. Otherwise, if it is aligned, make sure the entire base 3334 * IPv6 header is in the first mbuf of the chain. 3335 */ 3336 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3337 struct ifnet *inifp = m->m_pkthdr.rcvif; 3338 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3339 (max_linkhdr + 3) & ~3)) == NULL) { 3340 /* XXXJRT new stat, please */ 3341 V_ip6stat.ip6s_toosmall++; 3342 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3343 goto bad; 3344 } 3345 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3346 struct ifnet *inifp = m->m_pkthdr.rcvif; 3347 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3348 V_ip6stat.ip6s_toosmall++; 3349 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3350 goto bad; 3351 } 3352 } 3353 3354 ip6 = mtod(m, struct ip6_hdr *); 3355 3356 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3357 V_ip6stat.ip6s_badvers++; 3358 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3359 goto bad; 3360 } 3361 3362 /* Checks out, proceed */ 3363 *mp = m; 3364 return (0); 3365 3366 bad: 3367 *mp = m; 3368 return (-1); 3369 } 3370 #endif /* INET6 */ 3371 3372 /* 3373 * bridge_fragment: 3374 * 3375 * Return a fragmented mbuf chain. 3376 */ 3377 static int 3378 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3379 int snap, struct llc *llc) 3380 { 3381 INIT_VNET_INET(curvnet); 3382 struct mbuf *m0; 3383 struct ip *ip; 3384 int error = -1; 3385 3386 if (m->m_len < sizeof(struct ip) && 3387 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3388 goto out; 3389 ip = mtod(m, struct ip *); 3390 3391 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3392 CSUM_DELAY_IP); 3393 if (error) 3394 goto out; 3395 3396 /* walk the chain and re-add the Ethernet header */ 3397 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3398 if (error == 0) { 3399 if (snap) { 3400 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3401 if (m0 == NULL) { 3402 error = ENOBUFS; 3403 continue; 3404 } 3405 bcopy(llc, mtod(m0, caddr_t), 3406 sizeof(struct llc)); 3407 } 3408 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3409 if (m0 == NULL) { 3410 error = ENOBUFS; 3411 continue; 3412 } 3413 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3414 } else 3415 m_freem(m); 3416 } 3417 3418 if (error == 0) 3419 V_ipstat.ips_fragmented++; 3420 3421 return (error); 3422 3423 out: 3424 if (m != NULL) 3425 m_freem(m); 3426 return (error); 3427 } 3428