1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/mbuf.h> 85 #include <sys/malloc.h> 86 #include <sys/protosw.h> 87 #include <sys/systm.h> 88 #include <sys/jail.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 #include <sys/rwlock.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_clone.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_var.h> 111 #include <net/pfil.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> /* for struct arpcom */ 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #endif 123 #if defined(INET) || defined(INET6) 124 #include <netinet/ip_carp.h> 125 #endif 126 #include <machine/in_cksum.h> 127 #include <netinet/if_ether.h> /* for struct arpcom */ 128 #include <net/bridgestp.h> 129 #include <net/if_bridgevar.h> 130 #include <net/if_llc.h> 131 #include <net/if_vlan_var.h> 132 133 #include <net/route.h> 134 #include <netinet/ip_fw.h> 135 #include <netinet/ipfw/ip_fw_private.h> 136 137 /* 138 * Size of the route hash table. Must be a power of two. 139 */ 140 #ifndef BRIDGE_RTHASH_SIZE 141 #define BRIDGE_RTHASH_SIZE 1024 142 #endif 143 144 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 145 146 /* 147 * Maximum number of addresses to cache. 148 */ 149 #ifndef BRIDGE_RTABLE_MAX 150 #define BRIDGE_RTABLE_MAX 100 151 #endif 152 153 /* 154 * Timeout (in seconds) for entries learned dynamically. 155 */ 156 #ifndef BRIDGE_RTABLE_TIMEOUT 157 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 158 #endif 159 160 /* 161 * Number of seconds between walks of the route list. 162 */ 163 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 164 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 165 #endif 166 167 /* 168 * List of capabilities to possibly mask on the member interface. 169 */ 170 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 171 172 /* 173 * List of capabilities to strip 174 */ 175 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 176 177 /* 178 * Bridge interface list entry. 179 */ 180 struct bridge_iflist { 181 LIST_ENTRY(bridge_iflist) bif_next; 182 struct ifnet *bif_ifp; /* member if */ 183 struct bstp_port bif_stp; /* STP state */ 184 uint32_t bif_flags; /* member if flags */ 185 int bif_savedcaps; /* saved capabilities */ 186 uint32_t bif_addrmax; /* max # of addresses */ 187 uint32_t bif_addrcnt; /* cur. # of addresses */ 188 uint32_t bif_addrexceeded;/* # of address violations */ 189 }; 190 191 /* 192 * Bridge route node. 193 */ 194 struct bridge_rtnode { 195 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 196 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 197 struct bridge_iflist *brt_dst; /* destination if */ 198 unsigned long brt_expire; /* expiration time */ 199 uint8_t brt_flags; /* address flags */ 200 uint8_t brt_addr[ETHER_ADDR_LEN]; 201 uint16_t brt_vlan; /* vlan id */ 202 }; 203 #define brt_ifp brt_dst->bif_ifp 204 205 /* 206 * Software state for each bridge. 207 */ 208 struct bridge_softc { 209 struct ifnet *sc_ifp; /* make this an interface */ 210 LIST_ENTRY(bridge_softc) sc_list; 211 struct mtx sc_mtx; 212 struct cv sc_cv; 213 uint32_t sc_brtmax; /* max # of addresses */ 214 uint32_t sc_brtcnt; /* cur. # of addresses */ 215 uint32_t sc_brttimeout; /* rt timeout in seconds */ 216 struct callout sc_brcallout; /* bridge callout */ 217 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 218 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 219 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 220 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 221 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 222 uint32_t sc_rthash_key; /* key for hash */ 223 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 224 struct bstp_state sc_stp; /* STP state */ 225 uint32_t sc_brtexceeded; /* # of cache drops */ 226 struct ifnet *sc_ifaddr; /* member mac copied from */ 227 u_char sc_defaddr[6]; /* Default MAC address */ 228 }; 229 230 static struct mtx bridge_list_mtx; 231 eventhandler_tag bridge_detach_cookie = NULL; 232 233 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 234 235 uma_zone_t bridge_rtnode_zone; 236 237 static int bridge_clone_create(struct if_clone *, int, caddr_t); 238 static void bridge_clone_destroy(struct ifnet *); 239 240 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 241 static void bridge_mutecaps(struct bridge_softc *); 242 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 243 int); 244 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 245 static void bridge_init(void *); 246 static void bridge_dummynet(struct mbuf *, struct ifnet *); 247 static void bridge_stop(struct ifnet *, int); 248 static void bridge_start(struct ifnet *); 249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 250 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 251 struct rtentry *); 252 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 253 struct mbuf *); 254 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 255 256 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 257 struct mbuf *m); 258 259 static void bridge_timer(void *); 260 261 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 262 struct mbuf *, int); 263 static void bridge_span(struct bridge_softc *, struct mbuf *); 264 265 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 266 uint16_t, struct bridge_iflist *, int, uint8_t); 267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 268 uint16_t); 269 static void bridge_rttrim(struct bridge_softc *); 270 static void bridge_rtage(struct bridge_softc *); 271 static void bridge_rtflush(struct bridge_softc *, int); 272 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 273 uint16_t); 274 275 static int bridge_rtable_init(struct bridge_softc *); 276 static void bridge_rtable_fini(struct bridge_softc *); 277 278 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 280 const uint8_t *, uint16_t); 281 static int bridge_rtnode_insert(struct bridge_softc *, 282 struct bridge_rtnode *); 283 static void bridge_rtnode_destroy(struct bridge_softc *, 284 struct bridge_rtnode *); 285 static void bridge_rtable_expire(struct ifnet *, int); 286 static void bridge_state_change(struct ifnet *, int); 287 288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 289 const char *name); 290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 291 struct ifnet *ifp); 292 static void bridge_delete_member(struct bridge_softc *, 293 struct bridge_iflist *, int); 294 static void bridge_delete_span(struct bridge_softc *, 295 struct bridge_iflist *); 296 297 static int bridge_ioctl_add(struct bridge_softc *, void *); 298 static int bridge_ioctl_del(struct bridge_softc *, void *); 299 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 301 static int bridge_ioctl_scache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 303 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 304 static int bridge_ioctl_rts(struct bridge_softc *, void *); 305 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 306 static int bridge_ioctl_sto(struct bridge_softc *, void *); 307 static int bridge_ioctl_gto(struct bridge_softc *, void *); 308 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 309 static int bridge_ioctl_flush(struct bridge_softc *, void *); 310 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 311 static int bridge_ioctl_spri(struct bridge_softc *, void *); 312 static int bridge_ioctl_ght(struct bridge_softc *, void *); 313 static int bridge_ioctl_sht(struct bridge_softc *, void *); 314 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 316 static int bridge_ioctl_gma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sma(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 321 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 323 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 324 static int bridge_ioctl_grte(struct bridge_softc *, void *); 325 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 326 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 327 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 328 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 329 int); 330 static int bridge_ip_checkbasic(struct mbuf **mp); 331 #ifdef INET6 332 static int bridge_ip6_checkbasic(struct mbuf **mp); 333 #endif /* INET6 */ 334 static int bridge_fragment(struct ifnet *, struct mbuf *, 335 struct ether_header *, int, struct llc *); 336 337 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 338 #define VLANTAGOF(_m) \ 339 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 340 341 static struct bstp_cb_ops bridge_ops = { 342 .bcb_state = bridge_state_change, 343 .bcb_rtage = bridge_rtable_expire 344 }; 345 346 SYSCTL_DECL(_net_link); 347 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 348 349 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 350 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 351 static int pfil_member = 1; /* run pfil hooks on the member interface */ 352 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 353 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 354 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 355 locally destined packets */ 356 static int log_stp = 0; /* log STP state changes */ 357 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 359 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 360 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 361 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 363 &pfil_bridge, 0, "Packet filter on the bridge interface"); 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 365 &pfil_member, 0, "Packet filter on the member interface"); 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 367 &pfil_local_phys, 0, 368 "Packet filter on the physical interface for locally destined packets"); 369 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 370 &log_stp, 0, "Log STP state changes"); 371 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 372 &bridge_inherit_mac, 0, 373 "Inherit MAC address from the first bridge member"); 374 375 struct bridge_control { 376 int (*bc_func)(struct bridge_softc *, void *); 377 int bc_argsize; 378 int bc_flags; 379 }; 380 381 #define BC_F_COPYIN 0x01 /* copy arguments in */ 382 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 383 #define BC_F_SUSER 0x04 /* do super-user check */ 384 385 const struct bridge_control bridge_control_table[] = { 386 { bridge_ioctl_add, sizeof(struct ifbreq), 387 BC_F_COPYIN|BC_F_SUSER }, 388 { bridge_ioctl_del, sizeof(struct ifbreq), 389 BC_F_COPYIN|BC_F_SUSER }, 390 391 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 392 BC_F_COPYIN|BC_F_COPYOUT }, 393 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 394 BC_F_COPYIN|BC_F_SUSER }, 395 396 { bridge_ioctl_scache, sizeof(struct ifbrparam), 397 BC_F_COPYIN|BC_F_SUSER }, 398 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 399 BC_F_COPYOUT }, 400 401 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 402 BC_F_COPYIN|BC_F_COPYOUT }, 403 { bridge_ioctl_rts, sizeof(struct ifbaconf), 404 BC_F_COPYIN|BC_F_COPYOUT }, 405 406 { bridge_ioctl_saddr, sizeof(struct ifbareq), 407 BC_F_COPYIN|BC_F_SUSER }, 408 409 { bridge_ioctl_sto, sizeof(struct ifbrparam), 410 BC_F_COPYIN|BC_F_SUSER }, 411 { bridge_ioctl_gto, sizeof(struct ifbrparam), 412 BC_F_COPYOUT }, 413 414 { bridge_ioctl_daddr, sizeof(struct ifbareq), 415 BC_F_COPYIN|BC_F_SUSER }, 416 417 { bridge_ioctl_flush, sizeof(struct ifbreq), 418 BC_F_COPYIN|BC_F_SUSER }, 419 420 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 421 BC_F_COPYOUT }, 422 { bridge_ioctl_spri, sizeof(struct ifbrparam), 423 BC_F_COPYIN|BC_F_SUSER }, 424 425 { bridge_ioctl_ght, sizeof(struct ifbrparam), 426 BC_F_COPYOUT }, 427 { bridge_ioctl_sht, sizeof(struct ifbrparam), 428 BC_F_COPYIN|BC_F_SUSER }, 429 430 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 431 BC_F_COPYOUT }, 432 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 433 BC_F_COPYIN|BC_F_SUSER }, 434 435 { bridge_ioctl_gma, sizeof(struct ifbrparam), 436 BC_F_COPYOUT }, 437 { bridge_ioctl_sma, sizeof(struct ifbrparam), 438 BC_F_COPYIN|BC_F_SUSER }, 439 440 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 441 BC_F_COPYIN|BC_F_SUSER }, 442 443 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 444 BC_F_COPYIN|BC_F_SUSER }, 445 446 { bridge_ioctl_addspan, sizeof(struct ifbreq), 447 BC_F_COPYIN|BC_F_SUSER }, 448 { bridge_ioctl_delspan, sizeof(struct ifbreq), 449 BC_F_COPYIN|BC_F_SUSER }, 450 451 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 452 BC_F_COPYOUT }, 453 454 { bridge_ioctl_grte, sizeof(struct ifbrparam), 455 BC_F_COPYOUT }, 456 457 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 458 BC_F_COPYIN|BC_F_COPYOUT }, 459 460 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 461 BC_F_COPYIN|BC_F_SUSER }, 462 463 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 464 BC_F_COPYIN|BC_F_SUSER }, 465 466 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 467 BC_F_COPYIN|BC_F_SUSER }, 468 469 }; 470 const int bridge_control_table_size = 471 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 472 473 LIST_HEAD(, bridge_softc) bridge_list; 474 475 IFC_SIMPLE_DECLARE(bridge, 0); 476 477 static int 478 bridge_modevent(module_t mod, int type, void *data) 479 { 480 481 switch (type) { 482 case MOD_LOAD: 483 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 484 if_clone_attach(&bridge_cloner); 485 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 486 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 487 UMA_ALIGN_PTR, 0); 488 LIST_INIT(&bridge_list); 489 bridge_input_p = bridge_input; 490 bridge_output_p = bridge_output; 491 bridge_dn_p = bridge_dummynet; 492 bridge_detach_cookie = EVENTHANDLER_REGISTER( 493 ifnet_departure_event, bridge_ifdetach, NULL, 494 EVENTHANDLER_PRI_ANY); 495 break; 496 case MOD_UNLOAD: 497 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 498 bridge_detach_cookie); 499 if_clone_detach(&bridge_cloner); 500 uma_zdestroy(bridge_rtnode_zone); 501 bridge_input_p = NULL; 502 bridge_output_p = NULL; 503 bridge_dn_p = NULL; 504 mtx_destroy(&bridge_list_mtx); 505 break; 506 default: 507 return (EOPNOTSUPP); 508 } 509 return (0); 510 } 511 512 static moduledata_t bridge_mod = { 513 "if_bridge", 514 bridge_modevent, 515 0 516 }; 517 518 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 519 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 520 521 /* 522 * handler for net.link.bridge.pfil_ipfw 523 */ 524 static int 525 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 526 { 527 int enable = pfil_ipfw; 528 int error; 529 530 error = sysctl_handle_int(oidp, &enable, 0, req); 531 enable = (enable) ? 1 : 0; 532 533 if (enable != pfil_ipfw) { 534 pfil_ipfw = enable; 535 536 /* 537 * Disable pfil so that ipfw doesnt run twice, if the user 538 * really wants both then they can re-enable pfil_bridge and/or 539 * pfil_member. Also allow non-ip packets as ipfw can filter by 540 * layer2 type. 541 */ 542 if (pfil_ipfw) { 543 pfil_onlyip = 0; 544 pfil_bridge = 0; 545 pfil_member = 0; 546 } 547 } 548 549 return (error); 550 } 551 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 552 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 553 554 /* 555 * bridge_clone_create: 556 * 557 * Create a new bridge instance. 558 */ 559 static int 560 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 561 { 562 struct bridge_softc *sc, *sc2; 563 struct ifnet *bifp, *ifp; 564 int fb, retry; 565 unsigned long hostid; 566 567 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 568 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 569 if (ifp == NULL) { 570 free(sc, M_DEVBUF); 571 return (ENOSPC); 572 } 573 574 BRIDGE_LOCK_INIT(sc); 575 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 576 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 577 578 /* Initialize our routing table. */ 579 bridge_rtable_init(sc); 580 581 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 582 583 LIST_INIT(&sc->sc_iflist); 584 LIST_INIT(&sc->sc_spanlist); 585 586 ifp->if_softc = sc; 587 if_initname(ifp, ifc->ifc_name, unit); 588 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 589 ifp->if_ioctl = bridge_ioctl; 590 ifp->if_start = bridge_start; 591 ifp->if_init = bridge_init; 592 ifp->if_type = IFT_BRIDGE; 593 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 594 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 595 IFQ_SET_READY(&ifp->if_snd); 596 597 /* 598 * Generate an ethernet address with a locally administered address. 599 * 600 * Since we are using random ethernet addresses for the bridge, it is 601 * possible that we might have address collisions, so make sure that 602 * this hardware address isn't already in use on another bridge. 603 * The first try uses the hostid and falls back to arc4rand(). 604 */ 605 fb = 0; 606 getcredhostid(curthread->td_ucred, &hostid); 607 for (retry = 1; retry != 0;) { 608 if (fb || hostid == 0) { 609 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 610 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 611 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 612 } else { 613 sc->sc_defaddr[0] = 0x2; 614 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 615 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 616 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 617 sc->sc_defaddr[4] = hostid & 0xff; 618 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 619 } 620 621 fb = 1; 622 retry = 0; 623 mtx_lock(&bridge_list_mtx); 624 LIST_FOREACH(sc2, &bridge_list, sc_list) { 625 bifp = sc2->sc_ifp; 626 if (memcmp(sc->sc_defaddr, 627 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 628 retry = 1; 629 } 630 mtx_unlock(&bridge_list_mtx); 631 } 632 633 bstp_attach(&sc->sc_stp, &bridge_ops); 634 ether_ifattach(ifp, sc->sc_defaddr); 635 /* Now undo some of the damage... */ 636 ifp->if_baudrate = 0; 637 ifp->if_type = IFT_BRIDGE; 638 639 mtx_lock(&bridge_list_mtx); 640 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 641 mtx_unlock(&bridge_list_mtx); 642 643 return (0); 644 } 645 646 /* 647 * bridge_clone_destroy: 648 * 649 * Destroy a bridge instance. 650 */ 651 static void 652 bridge_clone_destroy(struct ifnet *ifp) 653 { 654 struct bridge_softc *sc = ifp->if_softc; 655 struct bridge_iflist *bif; 656 657 BRIDGE_LOCK(sc); 658 659 bridge_stop(ifp, 1); 660 ifp->if_flags &= ~IFF_UP; 661 662 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 663 bridge_delete_member(sc, bif, 0); 664 665 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 666 bridge_delete_span(sc, bif); 667 } 668 669 BRIDGE_UNLOCK(sc); 670 671 callout_drain(&sc->sc_brcallout); 672 673 mtx_lock(&bridge_list_mtx); 674 LIST_REMOVE(sc, sc_list); 675 mtx_unlock(&bridge_list_mtx); 676 677 bstp_detach(&sc->sc_stp); 678 ether_ifdetach(ifp); 679 if_free(ifp); 680 681 /* Tear down the routing table. */ 682 bridge_rtable_fini(sc); 683 684 BRIDGE_LOCK_DESTROY(sc); 685 free(sc, M_DEVBUF); 686 } 687 688 /* 689 * bridge_ioctl: 690 * 691 * Handle a control request from the operator. 692 */ 693 static int 694 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 695 { 696 struct bridge_softc *sc = ifp->if_softc; 697 struct ifreq *ifr = (struct ifreq *)data; 698 struct bridge_iflist *bif; 699 struct thread *td = curthread; 700 union { 701 struct ifbreq ifbreq; 702 struct ifbifconf ifbifconf; 703 struct ifbareq ifbareq; 704 struct ifbaconf ifbaconf; 705 struct ifbrparam ifbrparam; 706 struct ifbropreq ifbropreq; 707 } args; 708 struct ifdrv *ifd = (struct ifdrv *) data; 709 const struct bridge_control *bc; 710 int error = 0; 711 712 switch (cmd) { 713 714 case SIOCADDMULTI: 715 case SIOCDELMULTI: 716 break; 717 718 case SIOCGDRVSPEC: 719 case SIOCSDRVSPEC: 720 if (ifd->ifd_cmd >= bridge_control_table_size) { 721 error = EINVAL; 722 break; 723 } 724 bc = &bridge_control_table[ifd->ifd_cmd]; 725 726 if (cmd == SIOCGDRVSPEC && 727 (bc->bc_flags & BC_F_COPYOUT) == 0) { 728 error = EINVAL; 729 break; 730 } 731 else if (cmd == SIOCSDRVSPEC && 732 (bc->bc_flags & BC_F_COPYOUT) != 0) { 733 error = EINVAL; 734 break; 735 } 736 737 if (bc->bc_flags & BC_F_SUSER) { 738 error = priv_check(td, PRIV_NET_BRIDGE); 739 if (error) 740 break; 741 } 742 743 if (ifd->ifd_len != bc->bc_argsize || 744 ifd->ifd_len > sizeof(args)) { 745 error = EINVAL; 746 break; 747 } 748 749 bzero(&args, sizeof(args)); 750 if (bc->bc_flags & BC_F_COPYIN) { 751 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 752 if (error) 753 break; 754 } 755 756 BRIDGE_LOCK(sc); 757 error = (*bc->bc_func)(sc, &args); 758 BRIDGE_UNLOCK(sc); 759 if (error) 760 break; 761 762 if (bc->bc_flags & BC_F_COPYOUT) 763 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 764 765 break; 766 767 case SIOCSIFFLAGS: 768 if (!(ifp->if_flags & IFF_UP) && 769 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 770 /* 771 * If interface is marked down and it is running, 772 * then stop and disable it. 773 */ 774 BRIDGE_LOCK(sc); 775 bridge_stop(ifp, 1); 776 BRIDGE_UNLOCK(sc); 777 } else if ((ifp->if_flags & IFF_UP) && 778 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 779 /* 780 * If interface is marked up and it is stopped, then 781 * start it. 782 */ 783 (*ifp->if_init)(sc); 784 } 785 break; 786 787 case SIOCSIFMTU: 788 if (ifr->ifr_mtu < 576) { 789 error = EINVAL; 790 break; 791 } 792 if (LIST_EMPTY(&sc->sc_iflist)) { 793 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 794 break; 795 } 796 BRIDGE_LOCK(sc); 797 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 798 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 799 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 800 " != %d\n", sc->sc_ifp->if_xname, 801 bif->bif_ifp->if_mtu, 802 bif->bif_ifp->if_xname, ifr->ifr_mtu); 803 error = EINVAL; 804 break; 805 } 806 } 807 if (!error) 808 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 809 BRIDGE_UNLOCK(sc); 810 break; 811 default: 812 /* 813 * drop the lock as ether_ioctl() will call bridge_start() and 814 * cause the lock to be recursed. 815 */ 816 error = ether_ioctl(ifp, cmd, data); 817 break; 818 } 819 820 return (error); 821 } 822 823 /* 824 * bridge_mutecaps: 825 * 826 * Clear or restore unwanted capabilities on the member interface 827 */ 828 static void 829 bridge_mutecaps(struct bridge_softc *sc) 830 { 831 struct bridge_iflist *bif; 832 int enabled, mask; 833 834 /* Initial bitmask of capabilities to test */ 835 mask = BRIDGE_IFCAPS_MASK; 836 837 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 838 /* Every member must support it or its disabled */ 839 mask &= bif->bif_savedcaps; 840 } 841 842 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 843 enabled = bif->bif_ifp->if_capenable; 844 enabled &= ~BRIDGE_IFCAPS_STRIP; 845 /* strip off mask bits and enable them again if allowed */ 846 enabled &= ~BRIDGE_IFCAPS_MASK; 847 enabled |= mask; 848 bridge_set_ifcap(sc, bif, enabled); 849 } 850 851 } 852 853 static void 854 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 855 { 856 struct ifnet *ifp = bif->bif_ifp; 857 struct ifreq ifr; 858 int error; 859 860 bzero(&ifr, sizeof(ifr)); 861 ifr.ifr_reqcap = set; 862 863 if (ifp->if_capenable != set) { 864 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 865 if (error) 866 if_printf(sc->sc_ifp, 867 "error setting interface capabilities on %s\n", 868 ifp->if_xname); 869 } 870 } 871 872 /* 873 * bridge_lookup_member: 874 * 875 * Lookup a bridge member interface. 876 */ 877 static struct bridge_iflist * 878 bridge_lookup_member(struct bridge_softc *sc, const char *name) 879 { 880 struct bridge_iflist *bif; 881 struct ifnet *ifp; 882 883 BRIDGE_LOCK_ASSERT(sc); 884 885 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 886 ifp = bif->bif_ifp; 887 if (strcmp(ifp->if_xname, name) == 0) 888 return (bif); 889 } 890 891 return (NULL); 892 } 893 894 /* 895 * bridge_lookup_member_if: 896 * 897 * Lookup a bridge member interface by ifnet*. 898 */ 899 static struct bridge_iflist * 900 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 901 { 902 struct bridge_iflist *bif; 903 904 BRIDGE_LOCK_ASSERT(sc); 905 906 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 907 if (bif->bif_ifp == member_ifp) 908 return (bif); 909 } 910 911 return (NULL); 912 } 913 914 /* 915 * bridge_delete_member: 916 * 917 * Delete the specified member interface. 918 */ 919 static void 920 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 921 int gone) 922 { 923 struct ifnet *ifs = bif->bif_ifp; 924 struct ifnet *fif = NULL; 925 926 BRIDGE_LOCK_ASSERT(sc); 927 928 if (bif->bif_flags & IFBIF_STP) 929 bstp_disable(&bif->bif_stp); 930 931 ifs->if_bridge = NULL; 932 BRIDGE_XLOCK(sc); 933 LIST_REMOVE(bif, bif_next); 934 BRIDGE_XDROP(sc); 935 936 /* 937 * If removing the interface that gave the bridge its mac address, set 938 * the mac address of the bridge to the address of the next member, or 939 * to its default address if no members are left. 940 */ 941 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 942 if (LIST_EMPTY(&sc->sc_iflist)) { 943 bcopy(sc->sc_defaddr, 944 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 945 sc->sc_ifaddr = NULL; 946 } else { 947 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 948 bcopy(IF_LLADDR(fif), 949 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 950 sc->sc_ifaddr = fif; 951 } 952 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 953 } 954 955 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 956 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 957 KASSERT(bif->bif_addrcnt == 0, 958 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 959 960 BRIDGE_UNLOCK(sc); 961 if (!gone) { 962 switch (ifs->if_type) { 963 case IFT_ETHER: 964 case IFT_L2VLAN: 965 /* 966 * Take the interface out of promiscuous mode. 967 */ 968 (void) ifpromisc(ifs, 0); 969 break; 970 971 case IFT_GIF: 972 break; 973 974 default: 975 #ifdef DIAGNOSTIC 976 panic("bridge_delete_member: impossible"); 977 #endif 978 break; 979 } 980 /* reneable any interface capabilities */ 981 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 982 } 983 bstp_destroy(&bif->bif_stp); /* prepare to free */ 984 BRIDGE_LOCK(sc); 985 free(bif, M_DEVBUF); 986 } 987 988 /* 989 * bridge_delete_span: 990 * 991 * Delete the specified span interface. 992 */ 993 static void 994 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 995 { 996 BRIDGE_LOCK_ASSERT(sc); 997 998 KASSERT(bif->bif_ifp->if_bridge == NULL, 999 ("%s: not a span interface", __func__)); 1000 1001 LIST_REMOVE(bif, bif_next); 1002 free(bif, M_DEVBUF); 1003 } 1004 1005 static int 1006 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1007 { 1008 struct ifbreq *req = arg; 1009 struct bridge_iflist *bif = NULL; 1010 struct ifnet *ifs; 1011 int error = 0; 1012 1013 ifs = ifunit(req->ifbr_ifsname); 1014 if (ifs == NULL) 1015 return (ENOENT); 1016 if (ifs->if_ioctl == NULL) /* must be supported */ 1017 return (EINVAL); 1018 1019 /* If it's in the span list, it can't be a member. */ 1020 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1021 if (ifs == bif->bif_ifp) 1022 return (EBUSY); 1023 1024 if (ifs->if_bridge == sc) 1025 return (EEXIST); 1026 1027 if (ifs->if_bridge != NULL) 1028 return (EBUSY); 1029 1030 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1031 if (bif == NULL) 1032 return (ENOMEM); 1033 1034 bif->bif_ifp = ifs; 1035 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1036 bif->bif_savedcaps = ifs->if_capenable; 1037 1038 switch (ifs->if_type) { 1039 case IFT_ETHER: 1040 case IFT_L2VLAN: 1041 case IFT_GIF: 1042 /* permitted interface types */ 1043 break; 1044 default: 1045 error = EINVAL; 1046 goto out; 1047 } 1048 1049 /* Allow the first Ethernet member to define the MTU */ 1050 if (LIST_EMPTY(&sc->sc_iflist)) 1051 sc->sc_ifp->if_mtu = ifs->if_mtu; 1052 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1053 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1054 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1055 error = EINVAL; 1056 goto out; 1057 } 1058 1059 /* 1060 * Assign the interface's MAC address to the bridge if it's the first 1061 * member and the MAC address of the bridge has not been changed from 1062 * the default randomly generated one. 1063 */ 1064 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1065 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1066 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1067 sc->sc_ifaddr = ifs; 1068 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1069 } 1070 1071 ifs->if_bridge = sc; 1072 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1073 /* 1074 * XXX: XLOCK HERE!?! 1075 * 1076 * NOTE: insert_***HEAD*** should be safe for the traversals. 1077 */ 1078 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1079 1080 /* Set interface capabilities to the intersection set of all members */ 1081 bridge_mutecaps(sc); 1082 1083 switch (ifs->if_type) { 1084 case IFT_ETHER: 1085 case IFT_L2VLAN: 1086 /* 1087 * Place the interface into promiscuous mode. 1088 */ 1089 BRIDGE_UNLOCK(sc); 1090 error = ifpromisc(ifs, 1); 1091 BRIDGE_LOCK(sc); 1092 break; 1093 } 1094 if (error) 1095 bridge_delete_member(sc, bif, 0); 1096 out: 1097 if (error) { 1098 if (bif != NULL) 1099 free(bif, M_DEVBUF); 1100 } 1101 return (error); 1102 } 1103 1104 static int 1105 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1106 { 1107 struct ifbreq *req = arg; 1108 struct bridge_iflist *bif; 1109 1110 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1111 if (bif == NULL) 1112 return (ENOENT); 1113 1114 bridge_delete_member(sc, bif, 0); 1115 1116 return (0); 1117 } 1118 1119 static int 1120 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1121 { 1122 struct ifbreq *req = arg; 1123 struct bridge_iflist *bif; 1124 struct bstp_port *bp; 1125 1126 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1127 if (bif == NULL) 1128 return (ENOENT); 1129 1130 bp = &bif->bif_stp; 1131 req->ifbr_ifsflags = bif->bif_flags; 1132 req->ifbr_state = bp->bp_state; 1133 req->ifbr_priority = bp->bp_priority; 1134 req->ifbr_path_cost = bp->bp_path_cost; 1135 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1136 req->ifbr_proto = bp->bp_protover; 1137 req->ifbr_role = bp->bp_role; 1138 req->ifbr_stpflags = bp->bp_flags; 1139 req->ifbr_addrcnt = bif->bif_addrcnt; 1140 req->ifbr_addrmax = bif->bif_addrmax; 1141 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1142 1143 /* Copy STP state options as flags */ 1144 if (bp->bp_operedge) 1145 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1146 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1147 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1148 if (bp->bp_ptp_link) 1149 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1150 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1151 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1152 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1153 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1154 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1155 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1156 return (0); 1157 } 1158 1159 static int 1160 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1161 { 1162 struct ifbreq *req = arg; 1163 struct bridge_iflist *bif; 1164 struct bstp_port *bp; 1165 int error; 1166 1167 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1168 if (bif == NULL) 1169 return (ENOENT); 1170 bp = &bif->bif_stp; 1171 1172 if (req->ifbr_ifsflags & IFBIF_SPAN) 1173 /* SPAN is readonly */ 1174 return (EINVAL); 1175 1176 if (req->ifbr_ifsflags & IFBIF_STP) { 1177 if ((bif->bif_flags & IFBIF_STP) == 0) { 1178 error = bstp_enable(&bif->bif_stp); 1179 if (error) 1180 return (error); 1181 } 1182 } else { 1183 if ((bif->bif_flags & IFBIF_STP) != 0) 1184 bstp_disable(&bif->bif_stp); 1185 } 1186 1187 /* Pass on STP flags */ 1188 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1189 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1190 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1191 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1192 1193 /* Save the bits relating to the bridge */ 1194 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1195 1196 return (0); 1197 } 1198 1199 static int 1200 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1201 { 1202 struct ifbrparam *param = arg; 1203 1204 sc->sc_brtmax = param->ifbrp_csize; 1205 bridge_rttrim(sc); 1206 1207 return (0); 1208 } 1209 1210 static int 1211 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1212 { 1213 struct ifbrparam *param = arg; 1214 1215 param->ifbrp_csize = sc->sc_brtmax; 1216 1217 return (0); 1218 } 1219 1220 static int 1221 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1222 { 1223 struct ifbifconf *bifc = arg; 1224 struct bridge_iflist *bif; 1225 struct ifbreq breq; 1226 char *buf, *outbuf; 1227 int count, buflen, len, error = 0; 1228 1229 count = 0; 1230 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1231 count++; 1232 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1233 count++; 1234 1235 buflen = sizeof(breq) * count; 1236 if (bifc->ifbic_len == 0) { 1237 bifc->ifbic_len = buflen; 1238 return (0); 1239 } 1240 BRIDGE_UNLOCK(sc); 1241 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1242 BRIDGE_LOCK(sc); 1243 1244 count = 0; 1245 buf = outbuf; 1246 len = min(bifc->ifbic_len, buflen); 1247 bzero(&breq, sizeof(breq)); 1248 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1249 if (len < sizeof(breq)) 1250 break; 1251 1252 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1253 sizeof(breq.ifbr_ifsname)); 1254 /* Fill in the ifbreq structure */ 1255 error = bridge_ioctl_gifflags(sc, &breq); 1256 if (error) 1257 break; 1258 memcpy(buf, &breq, sizeof(breq)); 1259 count++; 1260 buf += sizeof(breq); 1261 len -= sizeof(breq); 1262 } 1263 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1264 if (len < sizeof(breq)) 1265 break; 1266 1267 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1268 sizeof(breq.ifbr_ifsname)); 1269 breq.ifbr_ifsflags = bif->bif_flags; 1270 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1271 memcpy(buf, &breq, sizeof(breq)); 1272 count++; 1273 buf += sizeof(breq); 1274 len -= sizeof(breq); 1275 } 1276 1277 BRIDGE_UNLOCK(sc); 1278 bifc->ifbic_len = sizeof(breq) * count; 1279 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1280 BRIDGE_LOCK(sc); 1281 free(outbuf, M_TEMP); 1282 return (error); 1283 } 1284 1285 static int 1286 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1287 { 1288 struct ifbaconf *bac = arg; 1289 struct bridge_rtnode *brt; 1290 struct ifbareq bareq; 1291 char *buf, *outbuf; 1292 int count, buflen, len, error = 0; 1293 1294 if (bac->ifbac_len == 0) 1295 return (0); 1296 1297 count = 0; 1298 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1299 count++; 1300 buflen = sizeof(bareq) * count; 1301 1302 BRIDGE_UNLOCK(sc); 1303 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1304 BRIDGE_LOCK(sc); 1305 1306 count = 0; 1307 buf = outbuf; 1308 len = min(bac->ifbac_len, buflen); 1309 bzero(&bareq, sizeof(bareq)); 1310 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1311 if (len < sizeof(bareq)) 1312 goto out; 1313 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1314 sizeof(bareq.ifba_ifsname)); 1315 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1316 bareq.ifba_vlan = brt->brt_vlan; 1317 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1318 time_uptime < brt->brt_expire) 1319 bareq.ifba_expire = brt->brt_expire - time_uptime; 1320 else 1321 bareq.ifba_expire = 0; 1322 bareq.ifba_flags = brt->brt_flags; 1323 1324 memcpy(buf, &bareq, sizeof(bareq)); 1325 count++; 1326 buf += sizeof(bareq); 1327 len -= sizeof(bareq); 1328 } 1329 out: 1330 BRIDGE_UNLOCK(sc); 1331 bac->ifbac_len = sizeof(bareq) * count; 1332 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1333 BRIDGE_LOCK(sc); 1334 free(outbuf, M_TEMP); 1335 return (error); 1336 } 1337 1338 static int 1339 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1340 { 1341 struct ifbareq *req = arg; 1342 struct bridge_iflist *bif; 1343 int error; 1344 1345 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1346 if (bif == NULL) 1347 return (ENOENT); 1348 1349 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1350 req->ifba_flags); 1351 1352 return (error); 1353 } 1354 1355 static int 1356 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1357 { 1358 struct ifbrparam *param = arg; 1359 1360 sc->sc_brttimeout = param->ifbrp_ctime; 1361 return (0); 1362 } 1363 1364 static int 1365 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1366 { 1367 struct ifbrparam *param = arg; 1368 1369 param->ifbrp_ctime = sc->sc_brttimeout; 1370 return (0); 1371 } 1372 1373 static int 1374 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1375 { 1376 struct ifbareq *req = arg; 1377 1378 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1379 } 1380 1381 static int 1382 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1383 { 1384 struct ifbreq *req = arg; 1385 1386 bridge_rtflush(sc, req->ifbr_ifsflags); 1387 return (0); 1388 } 1389 1390 static int 1391 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1392 { 1393 struct ifbrparam *param = arg; 1394 struct bstp_state *bs = &sc->sc_stp; 1395 1396 param->ifbrp_prio = bs->bs_bridge_priority; 1397 return (0); 1398 } 1399 1400 static int 1401 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1402 { 1403 struct ifbrparam *param = arg; 1404 1405 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1406 } 1407 1408 static int 1409 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1410 { 1411 struct ifbrparam *param = arg; 1412 struct bstp_state *bs = &sc->sc_stp; 1413 1414 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1415 return (0); 1416 } 1417 1418 static int 1419 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1420 { 1421 struct ifbrparam *param = arg; 1422 1423 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1424 } 1425 1426 static int 1427 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1428 { 1429 struct ifbrparam *param = arg; 1430 struct bstp_state *bs = &sc->sc_stp; 1431 1432 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1433 return (0); 1434 } 1435 1436 static int 1437 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1438 { 1439 struct ifbrparam *param = arg; 1440 1441 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1442 } 1443 1444 static int 1445 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1446 { 1447 struct ifbrparam *param = arg; 1448 struct bstp_state *bs = &sc->sc_stp; 1449 1450 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1451 return (0); 1452 } 1453 1454 static int 1455 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1456 { 1457 struct ifbrparam *param = arg; 1458 1459 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1460 } 1461 1462 static int 1463 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1464 { 1465 struct ifbreq *req = arg; 1466 struct bridge_iflist *bif; 1467 1468 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1469 if (bif == NULL) 1470 return (ENOENT); 1471 1472 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1473 } 1474 1475 static int 1476 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1477 { 1478 struct ifbreq *req = arg; 1479 struct bridge_iflist *bif; 1480 1481 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1482 if (bif == NULL) 1483 return (ENOENT); 1484 1485 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1486 } 1487 1488 static int 1489 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1490 { 1491 struct ifbreq *req = arg; 1492 struct bridge_iflist *bif; 1493 1494 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1495 if (bif == NULL) 1496 return (ENOENT); 1497 1498 bif->bif_addrmax = req->ifbr_addrmax; 1499 return (0); 1500 } 1501 1502 static int 1503 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1504 { 1505 struct ifbreq *req = arg; 1506 struct bridge_iflist *bif = NULL; 1507 struct ifnet *ifs; 1508 1509 ifs = ifunit(req->ifbr_ifsname); 1510 if (ifs == NULL) 1511 return (ENOENT); 1512 1513 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1514 if (ifs == bif->bif_ifp) 1515 return (EBUSY); 1516 1517 if (ifs->if_bridge != NULL) 1518 return (EBUSY); 1519 1520 switch (ifs->if_type) { 1521 case IFT_ETHER: 1522 case IFT_GIF: 1523 case IFT_L2VLAN: 1524 break; 1525 default: 1526 return (EINVAL); 1527 } 1528 1529 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1530 if (bif == NULL) 1531 return (ENOMEM); 1532 1533 bif->bif_ifp = ifs; 1534 bif->bif_flags = IFBIF_SPAN; 1535 1536 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1537 1538 return (0); 1539 } 1540 1541 static int 1542 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1543 { 1544 struct ifbreq *req = arg; 1545 struct bridge_iflist *bif; 1546 struct ifnet *ifs; 1547 1548 ifs = ifunit(req->ifbr_ifsname); 1549 if (ifs == NULL) 1550 return (ENOENT); 1551 1552 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1553 if (ifs == bif->bif_ifp) 1554 break; 1555 1556 if (bif == NULL) 1557 return (ENOENT); 1558 1559 bridge_delete_span(sc, bif); 1560 1561 return (0); 1562 } 1563 1564 static int 1565 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1566 { 1567 struct ifbropreq *req = arg; 1568 struct bstp_state *bs = &sc->sc_stp; 1569 struct bstp_port *root_port; 1570 1571 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1572 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1573 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1574 1575 root_port = bs->bs_root_port; 1576 if (root_port == NULL) 1577 req->ifbop_root_port = 0; 1578 else 1579 req->ifbop_root_port = root_port->bp_ifp->if_index; 1580 1581 req->ifbop_holdcount = bs->bs_txholdcount; 1582 req->ifbop_priority = bs->bs_bridge_priority; 1583 req->ifbop_protocol = bs->bs_protover; 1584 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1585 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1586 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1587 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1588 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1589 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1590 1591 return (0); 1592 } 1593 1594 static int 1595 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1596 { 1597 struct ifbrparam *param = arg; 1598 1599 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1600 return (0); 1601 } 1602 1603 static int 1604 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1605 { 1606 struct ifbpstpconf *bifstp = arg; 1607 struct bridge_iflist *bif; 1608 struct bstp_port *bp; 1609 struct ifbpstpreq bpreq; 1610 char *buf, *outbuf; 1611 int count, buflen, len, error = 0; 1612 1613 count = 0; 1614 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1615 if ((bif->bif_flags & IFBIF_STP) != 0) 1616 count++; 1617 } 1618 1619 buflen = sizeof(bpreq) * count; 1620 if (bifstp->ifbpstp_len == 0) { 1621 bifstp->ifbpstp_len = buflen; 1622 return (0); 1623 } 1624 1625 BRIDGE_UNLOCK(sc); 1626 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1627 BRIDGE_LOCK(sc); 1628 1629 count = 0; 1630 buf = outbuf; 1631 len = min(bifstp->ifbpstp_len, buflen); 1632 bzero(&bpreq, sizeof(bpreq)); 1633 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1634 if (len < sizeof(bpreq)) 1635 break; 1636 1637 if ((bif->bif_flags & IFBIF_STP) == 0) 1638 continue; 1639 1640 bp = &bif->bif_stp; 1641 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1642 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1643 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1644 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1645 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1646 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1647 1648 memcpy(buf, &bpreq, sizeof(bpreq)); 1649 count++; 1650 buf += sizeof(bpreq); 1651 len -= sizeof(bpreq); 1652 } 1653 1654 BRIDGE_UNLOCK(sc); 1655 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1656 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1657 BRIDGE_LOCK(sc); 1658 free(outbuf, M_TEMP); 1659 return (error); 1660 } 1661 1662 static int 1663 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1664 { 1665 struct ifbrparam *param = arg; 1666 1667 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1668 } 1669 1670 static int 1671 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1672 { 1673 struct ifbrparam *param = arg; 1674 1675 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1676 } 1677 1678 /* 1679 * bridge_ifdetach: 1680 * 1681 * Detach an interface from a bridge. Called when a member 1682 * interface is detaching. 1683 */ 1684 static void 1685 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1686 { 1687 struct bridge_softc *sc = ifp->if_bridge; 1688 struct bridge_iflist *bif; 1689 1690 /* Check if the interface is a bridge member */ 1691 if (sc != NULL) { 1692 BRIDGE_LOCK(sc); 1693 1694 bif = bridge_lookup_member_if(sc, ifp); 1695 if (bif != NULL) 1696 bridge_delete_member(sc, bif, 1); 1697 1698 BRIDGE_UNLOCK(sc); 1699 return; 1700 } 1701 1702 /* Check if the interface is a span port */ 1703 mtx_lock(&bridge_list_mtx); 1704 LIST_FOREACH(sc, &bridge_list, sc_list) { 1705 BRIDGE_LOCK(sc); 1706 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1707 if (ifp == bif->bif_ifp) { 1708 bridge_delete_span(sc, bif); 1709 break; 1710 } 1711 1712 BRIDGE_UNLOCK(sc); 1713 } 1714 mtx_unlock(&bridge_list_mtx); 1715 } 1716 1717 /* 1718 * bridge_init: 1719 * 1720 * Initialize a bridge interface. 1721 */ 1722 static void 1723 bridge_init(void *xsc) 1724 { 1725 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1726 struct ifnet *ifp = sc->sc_ifp; 1727 1728 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1729 return; 1730 1731 BRIDGE_LOCK(sc); 1732 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1733 bridge_timer, sc); 1734 1735 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1736 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1737 1738 BRIDGE_UNLOCK(sc); 1739 } 1740 1741 /* 1742 * bridge_stop: 1743 * 1744 * Stop the bridge interface. 1745 */ 1746 static void 1747 bridge_stop(struct ifnet *ifp, int disable) 1748 { 1749 struct bridge_softc *sc = ifp->if_softc; 1750 1751 BRIDGE_LOCK_ASSERT(sc); 1752 1753 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1754 return; 1755 1756 callout_stop(&sc->sc_brcallout); 1757 bstp_stop(&sc->sc_stp); 1758 1759 bridge_rtflush(sc, IFBF_FLUSHDYN); 1760 1761 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1762 } 1763 1764 /* 1765 * bridge_enqueue: 1766 * 1767 * Enqueue a packet on a bridge member interface. 1768 * 1769 */ 1770 static void 1771 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1772 { 1773 int len, err = 0; 1774 short mflags; 1775 struct mbuf *m0; 1776 1777 len = m->m_pkthdr.len; 1778 mflags = m->m_flags; 1779 1780 /* We may be sending a fragment so traverse the mbuf */ 1781 for (; m; m = m0) { 1782 m0 = m->m_nextpkt; 1783 m->m_nextpkt = NULL; 1784 1785 /* 1786 * If underlying interface can not do VLAN tag insertion itself 1787 * then attach a packet tag that holds it. 1788 */ 1789 if ((m->m_flags & M_VLANTAG) && 1790 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1791 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1792 if (m == NULL) { 1793 if_printf(dst_ifp, 1794 "unable to prepend VLAN header\n"); 1795 dst_ifp->if_oerrors++; 1796 continue; 1797 } 1798 m->m_flags &= ~M_VLANTAG; 1799 } 1800 1801 if (err == 0) 1802 dst_ifp->if_transmit(dst_ifp, m); 1803 } 1804 1805 if (err == 0) { 1806 sc->sc_ifp->if_opackets++; 1807 sc->sc_ifp->if_obytes += len; 1808 if (mflags & M_MCAST) 1809 sc->sc_ifp->if_omcasts++; 1810 } 1811 } 1812 1813 /* 1814 * bridge_dummynet: 1815 * 1816 * Receive a queued packet from dummynet and pass it on to the output 1817 * interface. 1818 * 1819 * The mbuf has the Ethernet header already attached. 1820 */ 1821 static void 1822 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1823 { 1824 struct bridge_softc *sc; 1825 1826 sc = ifp->if_bridge; 1827 1828 /* 1829 * The packet didnt originate from a member interface. This should only 1830 * ever happen if a member interface is removed while packets are 1831 * queued for it. 1832 */ 1833 if (sc == NULL) { 1834 m_freem(m); 1835 return; 1836 } 1837 1838 if (PFIL_HOOKED(&V_inet_pfil_hook) 1839 #ifdef INET6 1840 || PFIL_HOOKED(&V_inet6_pfil_hook) 1841 #endif 1842 ) { 1843 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1844 return; 1845 if (m == NULL) 1846 return; 1847 } 1848 1849 bridge_enqueue(sc, ifp, m); 1850 } 1851 1852 /* 1853 * bridge_output: 1854 * 1855 * Send output from a bridge member interface. This 1856 * performs the bridging function for locally originated 1857 * packets. 1858 * 1859 * The mbuf has the Ethernet header already attached. We must 1860 * enqueue or free the mbuf before returning. 1861 */ 1862 static int 1863 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1864 struct rtentry *rt) 1865 { 1866 struct ether_header *eh; 1867 struct ifnet *dst_if; 1868 struct bridge_softc *sc; 1869 uint16_t vlan; 1870 1871 if (m->m_len < ETHER_HDR_LEN) { 1872 m = m_pullup(m, ETHER_HDR_LEN); 1873 if (m == NULL) 1874 return (0); 1875 } 1876 1877 eh = mtod(m, struct ether_header *); 1878 sc = ifp->if_bridge; 1879 vlan = VLANTAGOF(m); 1880 1881 BRIDGE_LOCK(sc); 1882 1883 /* 1884 * If bridge is down, but the original output interface is up, 1885 * go ahead and send out that interface. Otherwise, the packet 1886 * is dropped below. 1887 */ 1888 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1889 dst_if = ifp; 1890 goto sendunicast; 1891 } 1892 1893 /* 1894 * If the packet is a multicast, or we don't know a better way to 1895 * get there, send to all interfaces. 1896 */ 1897 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1898 dst_if = NULL; 1899 else 1900 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1901 if (dst_if == NULL) { 1902 struct bridge_iflist *bif; 1903 struct mbuf *mc; 1904 int error = 0, used = 0; 1905 1906 bridge_span(sc, m); 1907 1908 BRIDGE_LOCK2REF(sc, error); 1909 if (error) { 1910 m_freem(m); 1911 return (0); 1912 } 1913 1914 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1915 dst_if = bif->bif_ifp; 1916 1917 if (dst_if->if_type == IFT_GIF) 1918 continue; 1919 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1920 continue; 1921 1922 /* 1923 * If this is not the original output interface, 1924 * and the interface is participating in spanning 1925 * tree, make sure the port is in a state that 1926 * allows forwarding. 1927 */ 1928 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1929 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1930 continue; 1931 1932 if (LIST_NEXT(bif, bif_next) == NULL) { 1933 used = 1; 1934 mc = m; 1935 } else { 1936 mc = m_copypacket(m, M_DONTWAIT); 1937 if (mc == NULL) { 1938 sc->sc_ifp->if_oerrors++; 1939 continue; 1940 } 1941 } 1942 1943 bridge_enqueue(sc, dst_if, mc); 1944 } 1945 if (used == 0) 1946 m_freem(m); 1947 BRIDGE_UNREF(sc); 1948 return (0); 1949 } 1950 1951 sendunicast: 1952 /* 1953 * XXX Spanning tree consideration here? 1954 */ 1955 1956 bridge_span(sc, m); 1957 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1958 m_freem(m); 1959 BRIDGE_UNLOCK(sc); 1960 return (0); 1961 } 1962 1963 BRIDGE_UNLOCK(sc); 1964 bridge_enqueue(sc, dst_if, m); 1965 return (0); 1966 } 1967 1968 /* 1969 * bridge_start: 1970 * 1971 * Start output on a bridge. 1972 * 1973 */ 1974 static void 1975 bridge_start(struct ifnet *ifp) 1976 { 1977 struct bridge_softc *sc; 1978 struct mbuf *m; 1979 struct ether_header *eh; 1980 struct ifnet *dst_if; 1981 1982 sc = ifp->if_softc; 1983 1984 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1985 for (;;) { 1986 IFQ_DEQUEUE(&ifp->if_snd, m); 1987 if (m == 0) 1988 break; 1989 ETHER_BPF_MTAP(ifp, m); 1990 1991 eh = mtod(m, struct ether_header *); 1992 dst_if = NULL; 1993 1994 BRIDGE_LOCK(sc); 1995 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1996 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1997 } 1998 1999 if (dst_if == NULL) 2000 bridge_broadcast(sc, ifp, m, 0); 2001 else { 2002 BRIDGE_UNLOCK(sc); 2003 bridge_enqueue(sc, dst_if, m); 2004 } 2005 } 2006 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 2007 } 2008 2009 /* 2010 * bridge_forward: 2011 * 2012 * The forwarding function of the bridge. 2013 * 2014 * NOTE: Releases the lock on return. 2015 */ 2016 static void 2017 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2018 struct mbuf *m) 2019 { 2020 struct bridge_iflist *dbif; 2021 struct ifnet *src_if, *dst_if, *ifp; 2022 struct ether_header *eh; 2023 uint16_t vlan; 2024 uint8_t *dst; 2025 int error; 2026 2027 src_if = m->m_pkthdr.rcvif; 2028 ifp = sc->sc_ifp; 2029 2030 ifp->if_ipackets++; 2031 ifp->if_ibytes += m->m_pkthdr.len; 2032 vlan = VLANTAGOF(m); 2033 2034 if ((sbif->bif_flags & IFBIF_STP) && 2035 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2036 goto drop; 2037 2038 eh = mtod(m, struct ether_header *); 2039 dst = eh->ether_dhost; 2040 2041 /* If the interface is learning, record the address. */ 2042 if (sbif->bif_flags & IFBIF_LEARNING) { 2043 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2044 sbif, 0, IFBAF_DYNAMIC); 2045 /* 2046 * If the interface has addresses limits then deny any source 2047 * that is not in the cache. 2048 */ 2049 if (error && sbif->bif_addrmax) 2050 goto drop; 2051 } 2052 2053 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2054 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2055 goto drop; 2056 2057 /* 2058 * At this point, the port either doesn't participate 2059 * in spanning tree or it is in the forwarding state. 2060 */ 2061 2062 /* 2063 * If the packet is unicast, destined for someone on 2064 * "this" side of the bridge, drop it. 2065 */ 2066 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2067 dst_if = bridge_rtlookup(sc, dst, vlan); 2068 if (src_if == dst_if) 2069 goto drop; 2070 } else { 2071 /* 2072 * Check if its a reserved multicast address, any address 2073 * listed in 802.1D section 7.12.6 may not be forwarded by the 2074 * bridge. 2075 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2076 */ 2077 if (dst[0] == 0x01 && dst[1] == 0x80 && 2078 dst[2] == 0xc2 && dst[3] == 0x00 && 2079 dst[4] == 0x00 && dst[5] <= 0x0f) 2080 goto drop; 2081 2082 /* ...forward it to all interfaces. */ 2083 ifp->if_imcasts++; 2084 dst_if = NULL; 2085 } 2086 2087 /* 2088 * If we have a destination interface which is a member of our bridge, 2089 * OR this is a unicast packet, push it through the bpf(4) machinery. 2090 * For broadcast or multicast packets, don't bother because it will 2091 * be reinjected into ether_input. We do this before we pass the packets 2092 * through the pfil(9) framework, as it is possible that pfil(9) will 2093 * drop the packet, or possibly modify it, making it difficult to debug 2094 * firewall issues on the bridge. 2095 */ 2096 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2097 ETHER_BPF_MTAP(ifp, m); 2098 2099 /* run the packet filter */ 2100 if (PFIL_HOOKED(&V_inet_pfil_hook) 2101 #ifdef INET6 2102 || PFIL_HOOKED(&V_inet6_pfil_hook) 2103 #endif 2104 ) { 2105 BRIDGE_UNLOCK(sc); 2106 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2107 return; 2108 if (m == NULL) 2109 return; 2110 BRIDGE_LOCK(sc); 2111 } 2112 2113 if (dst_if == NULL) { 2114 bridge_broadcast(sc, src_if, m, 1); 2115 return; 2116 } 2117 2118 /* 2119 * At this point, we're dealing with a unicast frame 2120 * going to a different interface. 2121 */ 2122 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2123 goto drop; 2124 2125 dbif = bridge_lookup_member_if(sc, dst_if); 2126 if (dbif == NULL) 2127 /* Not a member of the bridge (anymore?) */ 2128 goto drop; 2129 2130 /* Private segments can not talk to each other */ 2131 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2132 goto drop; 2133 2134 if ((dbif->bif_flags & IFBIF_STP) && 2135 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2136 goto drop; 2137 2138 BRIDGE_UNLOCK(sc); 2139 2140 if (PFIL_HOOKED(&V_inet_pfil_hook) 2141 #ifdef INET6 2142 || PFIL_HOOKED(&V_inet6_pfil_hook) 2143 #endif 2144 ) { 2145 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2146 return; 2147 if (m == NULL) 2148 return; 2149 } 2150 2151 bridge_enqueue(sc, dst_if, m); 2152 return; 2153 2154 drop: 2155 BRIDGE_UNLOCK(sc); 2156 m_freem(m); 2157 } 2158 2159 /* 2160 * bridge_input: 2161 * 2162 * Receive input from a member interface. Queue the packet for 2163 * bridging if it is not for us. 2164 */ 2165 static struct mbuf * 2166 bridge_input(struct ifnet *ifp, struct mbuf *m) 2167 { 2168 struct bridge_softc *sc = ifp->if_bridge; 2169 struct bridge_iflist *bif, *bif2; 2170 struct ifnet *bifp; 2171 struct ether_header *eh; 2172 struct mbuf *mc, *mc2; 2173 uint16_t vlan; 2174 int error; 2175 2176 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2177 return (m); 2178 2179 bifp = sc->sc_ifp; 2180 vlan = VLANTAGOF(m); 2181 2182 /* 2183 * Implement support for bridge monitoring. If this flag has been 2184 * set on this interface, discard the packet once we push it through 2185 * the bpf(4) machinery, but before we do, increment the byte and 2186 * packet counters associated with this interface. 2187 */ 2188 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2189 m->m_pkthdr.rcvif = bifp; 2190 ETHER_BPF_MTAP(bifp, m); 2191 bifp->if_ipackets++; 2192 bifp->if_ibytes += m->m_pkthdr.len; 2193 m_freem(m); 2194 return (NULL); 2195 } 2196 BRIDGE_LOCK(sc); 2197 bif = bridge_lookup_member_if(sc, ifp); 2198 if (bif == NULL) { 2199 BRIDGE_UNLOCK(sc); 2200 return (m); 2201 } 2202 2203 eh = mtod(m, struct ether_header *); 2204 2205 bridge_span(sc, m); 2206 2207 if (m->m_flags & (M_BCAST|M_MCAST)) { 2208 /* Tap off 802.1D packets; they do not get forwarded. */ 2209 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2210 ETHER_ADDR_LEN) == 0) { 2211 m = bstp_input(&bif->bif_stp, ifp, m); 2212 if (m == NULL) { 2213 BRIDGE_UNLOCK(sc); 2214 return (NULL); 2215 } 2216 } 2217 2218 if ((bif->bif_flags & IFBIF_STP) && 2219 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2220 BRIDGE_UNLOCK(sc); 2221 return (m); 2222 } 2223 2224 /* 2225 * Make a deep copy of the packet and enqueue the copy 2226 * for bridge processing; return the original packet for 2227 * local processing. 2228 */ 2229 mc = m_dup(m, M_DONTWAIT); 2230 if (mc == NULL) { 2231 BRIDGE_UNLOCK(sc); 2232 return (m); 2233 } 2234 2235 /* Perform the bridge forwarding function with the copy. */ 2236 bridge_forward(sc, bif, mc); 2237 2238 /* 2239 * Reinject the mbuf as arriving on the bridge so we have a 2240 * chance at claiming multicast packets. We can not loop back 2241 * here from ether_input as a bridge is never a member of a 2242 * bridge. 2243 */ 2244 KASSERT(bifp->if_bridge == NULL, 2245 ("loop created in bridge_input")); 2246 mc2 = m_dup(m, M_DONTWAIT); 2247 if (mc2 != NULL) { 2248 /* Keep the layer3 header aligned */ 2249 int i = min(mc2->m_pkthdr.len, max_protohdr); 2250 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2251 } 2252 if (mc2 != NULL) { 2253 mc2->m_pkthdr.rcvif = bifp; 2254 (*bifp->if_input)(bifp, mc2); 2255 } 2256 2257 /* Return the original packet for local processing. */ 2258 return (m); 2259 } 2260 2261 if ((bif->bif_flags & IFBIF_STP) && 2262 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2263 BRIDGE_UNLOCK(sc); 2264 return (m); 2265 } 2266 2267 #if (defined(INET) || defined(INET6)) 2268 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2269 || ((iface)->if_carp \ 2270 && (*carp_forus_p)((iface), eh->ether_dhost)) 2271 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2272 || ((iface)->if_carp \ 2273 && (*carp_forus_p)((iface), eh->ether_shost)) 2274 #else 2275 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2276 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2277 #endif 2278 2279 #ifdef INET6 2280 # define OR_PFIL_HOOKED_INET6 \ 2281 || PFIL_HOOKED(&V_inet6_pfil_hook) 2282 #else 2283 # define OR_PFIL_HOOKED_INET6 2284 #endif 2285 2286 #define GRAB_OUR_PACKETS(iface) \ 2287 if ((iface)->if_type == IFT_GIF) \ 2288 continue; \ 2289 /* It is destined for us. */ \ 2290 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2291 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2292 ) { \ 2293 if ((iface)->if_type == IFT_BRIDGE) { \ 2294 ETHER_BPF_MTAP(iface, m); \ 2295 iface->if_ipackets++; \ 2296 /* Filter on the physical interface. */ \ 2297 if (pfil_local_phys && \ 2298 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2299 OR_PFIL_HOOKED_INET6)) { \ 2300 if (bridge_pfil(&m, NULL, ifp, \ 2301 PFIL_IN) != 0 || m == NULL) { \ 2302 BRIDGE_UNLOCK(sc); \ 2303 return (NULL); \ 2304 } \ 2305 } \ 2306 } \ 2307 if (bif->bif_flags & IFBIF_LEARNING) { \ 2308 error = bridge_rtupdate(sc, eh->ether_shost, \ 2309 vlan, bif, 0, IFBAF_DYNAMIC); \ 2310 if (error && bif->bif_addrmax) { \ 2311 BRIDGE_UNLOCK(sc); \ 2312 m_freem(m); \ 2313 return (NULL); \ 2314 } \ 2315 } \ 2316 m->m_pkthdr.rcvif = iface; \ 2317 BRIDGE_UNLOCK(sc); \ 2318 return (m); \ 2319 } \ 2320 \ 2321 /* We just received a packet that we sent out. */ \ 2322 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2323 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2324 ) { \ 2325 BRIDGE_UNLOCK(sc); \ 2326 m_freem(m); \ 2327 return (NULL); \ 2328 } 2329 2330 /* 2331 * Unicast. Make sure it's not for the bridge. 2332 */ 2333 do { GRAB_OUR_PACKETS(bifp) } while (0); 2334 2335 /* 2336 * Give a chance for ifp at first priority. This will help when the 2337 * packet comes through the interface like VLAN's with the same MACs 2338 * on several interfaces from the same bridge. This also will save 2339 * some CPU cycles in case the destination interface and the input 2340 * interface (eq ifp) are the same. 2341 */ 2342 do { GRAB_OUR_PACKETS(ifp) } while (0); 2343 2344 /* Now check the all bridge members. */ 2345 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2346 GRAB_OUR_PACKETS(bif2->bif_ifp) 2347 } 2348 2349 #undef OR_CARP_CHECK_WE_ARE_DST 2350 #undef OR_CARP_CHECK_WE_ARE_SRC 2351 #undef OR_PFIL_HOOKED_INET6 2352 #undef GRAB_OUR_PACKETS 2353 2354 /* Perform the bridge forwarding function. */ 2355 bridge_forward(sc, bif, m); 2356 2357 return (NULL); 2358 } 2359 2360 /* 2361 * bridge_broadcast: 2362 * 2363 * Send a frame to all interfaces that are members of 2364 * the bridge, except for the one on which the packet 2365 * arrived. 2366 * 2367 * NOTE: Releases the lock on return. 2368 */ 2369 static void 2370 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2371 struct mbuf *m, int runfilt) 2372 { 2373 struct bridge_iflist *dbif, *sbif; 2374 struct mbuf *mc; 2375 struct ifnet *dst_if; 2376 int error = 0, used = 0, i; 2377 2378 sbif = bridge_lookup_member_if(sc, src_if); 2379 2380 BRIDGE_LOCK2REF(sc, error); 2381 if (error) { 2382 m_freem(m); 2383 return; 2384 } 2385 2386 /* Filter on the bridge interface before broadcasting */ 2387 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2388 #ifdef INET6 2389 || PFIL_HOOKED(&V_inet6_pfil_hook) 2390 #endif 2391 )) { 2392 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2393 goto out; 2394 if (m == NULL) 2395 goto out; 2396 } 2397 2398 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2399 dst_if = dbif->bif_ifp; 2400 if (dst_if == src_if) 2401 continue; 2402 2403 /* Private segments can not talk to each other */ 2404 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2405 continue; 2406 2407 if ((dbif->bif_flags & IFBIF_STP) && 2408 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2409 continue; 2410 2411 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2412 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2413 continue; 2414 2415 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2416 continue; 2417 2418 if (LIST_NEXT(dbif, bif_next) == NULL) { 2419 mc = m; 2420 used = 1; 2421 } else { 2422 mc = m_dup(m, M_DONTWAIT); 2423 if (mc == NULL) { 2424 sc->sc_ifp->if_oerrors++; 2425 continue; 2426 } 2427 } 2428 2429 /* 2430 * Filter on the output interface. Pass a NULL bridge interface 2431 * pointer so we do not redundantly filter on the bridge for 2432 * each interface we broadcast on. 2433 */ 2434 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2435 #ifdef INET6 2436 || PFIL_HOOKED(&V_inet6_pfil_hook) 2437 #endif 2438 )) { 2439 if (used == 0) { 2440 /* Keep the layer3 header aligned */ 2441 i = min(mc->m_pkthdr.len, max_protohdr); 2442 mc = m_copyup(mc, i, ETHER_ALIGN); 2443 if (mc == NULL) { 2444 sc->sc_ifp->if_oerrors++; 2445 continue; 2446 } 2447 } 2448 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2449 continue; 2450 if (mc == NULL) 2451 continue; 2452 } 2453 2454 bridge_enqueue(sc, dst_if, mc); 2455 } 2456 if (used == 0) 2457 m_freem(m); 2458 2459 out: 2460 BRIDGE_UNREF(sc); 2461 } 2462 2463 /* 2464 * bridge_span: 2465 * 2466 * Duplicate a packet out one or more interfaces that are in span mode, 2467 * the original mbuf is unmodified. 2468 */ 2469 static void 2470 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2471 { 2472 struct bridge_iflist *bif; 2473 struct ifnet *dst_if; 2474 struct mbuf *mc; 2475 2476 if (LIST_EMPTY(&sc->sc_spanlist)) 2477 return; 2478 2479 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2480 dst_if = bif->bif_ifp; 2481 2482 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2483 continue; 2484 2485 mc = m_copypacket(m, M_DONTWAIT); 2486 if (mc == NULL) { 2487 sc->sc_ifp->if_oerrors++; 2488 continue; 2489 } 2490 2491 bridge_enqueue(sc, dst_if, mc); 2492 } 2493 } 2494 2495 /* 2496 * bridge_rtupdate: 2497 * 2498 * Add a bridge routing entry. 2499 */ 2500 static int 2501 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2502 struct bridge_iflist *bif, int setflags, uint8_t flags) 2503 { 2504 struct bridge_rtnode *brt; 2505 int error; 2506 2507 BRIDGE_LOCK_ASSERT(sc); 2508 2509 /* Check the source address is valid and not multicast. */ 2510 if (ETHER_IS_MULTICAST(dst) || 2511 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2512 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2513 return (EINVAL); 2514 2515 /* 802.1p frames map to vlan 1 */ 2516 if (vlan == 0) 2517 vlan = 1; 2518 2519 /* 2520 * A route for this destination might already exist. If so, 2521 * update it, otherwise create a new one. 2522 */ 2523 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2524 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2525 sc->sc_brtexceeded++; 2526 return (ENOSPC); 2527 } 2528 /* Check per interface address limits (if enabled) */ 2529 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2530 bif->bif_addrexceeded++; 2531 return (ENOSPC); 2532 } 2533 2534 /* 2535 * Allocate a new bridge forwarding node, and 2536 * initialize the expiration time and Ethernet 2537 * address. 2538 */ 2539 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2540 if (brt == NULL) 2541 return (ENOMEM); 2542 2543 if (bif->bif_flags & IFBIF_STICKY) 2544 brt->brt_flags = IFBAF_STICKY; 2545 else 2546 brt->brt_flags = IFBAF_DYNAMIC; 2547 2548 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2549 brt->brt_vlan = vlan; 2550 2551 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2552 uma_zfree(bridge_rtnode_zone, brt); 2553 return (error); 2554 } 2555 brt->brt_dst = bif; 2556 bif->bif_addrcnt++; 2557 } 2558 2559 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2560 brt->brt_dst != bif) { 2561 brt->brt_dst->bif_addrcnt--; 2562 brt->brt_dst = bif; 2563 brt->brt_dst->bif_addrcnt++; 2564 } 2565 2566 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2567 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2568 if (setflags) 2569 brt->brt_flags = flags; 2570 2571 return (0); 2572 } 2573 2574 /* 2575 * bridge_rtlookup: 2576 * 2577 * Lookup the destination interface for an address. 2578 */ 2579 static struct ifnet * 2580 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2581 { 2582 struct bridge_rtnode *brt; 2583 2584 BRIDGE_LOCK_ASSERT(sc); 2585 2586 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2587 return (NULL); 2588 2589 return (brt->brt_ifp); 2590 } 2591 2592 /* 2593 * bridge_rttrim: 2594 * 2595 * Trim the routine table so that we have a number 2596 * of routing entries less than or equal to the 2597 * maximum number. 2598 */ 2599 static void 2600 bridge_rttrim(struct bridge_softc *sc) 2601 { 2602 struct bridge_rtnode *brt, *nbrt; 2603 2604 BRIDGE_LOCK_ASSERT(sc); 2605 2606 /* Make sure we actually need to do this. */ 2607 if (sc->sc_brtcnt <= sc->sc_brtmax) 2608 return; 2609 2610 /* Force an aging cycle; this might trim enough addresses. */ 2611 bridge_rtage(sc); 2612 if (sc->sc_brtcnt <= sc->sc_brtmax) 2613 return; 2614 2615 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2616 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2617 bridge_rtnode_destroy(sc, brt); 2618 if (sc->sc_brtcnt <= sc->sc_brtmax) 2619 return; 2620 } 2621 } 2622 } 2623 2624 /* 2625 * bridge_timer: 2626 * 2627 * Aging timer for the bridge. 2628 */ 2629 static void 2630 bridge_timer(void *arg) 2631 { 2632 struct bridge_softc *sc = arg; 2633 2634 BRIDGE_LOCK_ASSERT(sc); 2635 2636 bridge_rtage(sc); 2637 2638 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2639 callout_reset(&sc->sc_brcallout, 2640 bridge_rtable_prune_period * hz, bridge_timer, sc); 2641 } 2642 2643 /* 2644 * bridge_rtage: 2645 * 2646 * Perform an aging cycle. 2647 */ 2648 static void 2649 bridge_rtage(struct bridge_softc *sc) 2650 { 2651 struct bridge_rtnode *brt, *nbrt; 2652 2653 BRIDGE_LOCK_ASSERT(sc); 2654 2655 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2656 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2657 if (time_uptime >= brt->brt_expire) 2658 bridge_rtnode_destroy(sc, brt); 2659 } 2660 } 2661 } 2662 2663 /* 2664 * bridge_rtflush: 2665 * 2666 * Remove all dynamic addresses from the bridge. 2667 */ 2668 static void 2669 bridge_rtflush(struct bridge_softc *sc, int full) 2670 { 2671 struct bridge_rtnode *brt, *nbrt; 2672 2673 BRIDGE_LOCK_ASSERT(sc); 2674 2675 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2676 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2677 bridge_rtnode_destroy(sc, brt); 2678 } 2679 } 2680 2681 /* 2682 * bridge_rtdaddr: 2683 * 2684 * Remove an address from the table. 2685 */ 2686 static int 2687 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2688 { 2689 struct bridge_rtnode *brt; 2690 int found = 0; 2691 2692 BRIDGE_LOCK_ASSERT(sc); 2693 2694 /* 2695 * If vlan is zero then we want to delete for all vlans so the lookup 2696 * may return more than one. 2697 */ 2698 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2699 bridge_rtnode_destroy(sc, brt); 2700 found = 1; 2701 } 2702 2703 return (found ? 0 : ENOENT); 2704 } 2705 2706 /* 2707 * bridge_rtdelete: 2708 * 2709 * Delete routes to a speicifc member interface. 2710 */ 2711 static void 2712 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2713 { 2714 struct bridge_rtnode *brt, *nbrt; 2715 2716 BRIDGE_LOCK_ASSERT(sc); 2717 2718 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2719 if (brt->brt_ifp == ifp && (full || 2720 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2721 bridge_rtnode_destroy(sc, brt); 2722 } 2723 } 2724 2725 /* 2726 * bridge_rtable_init: 2727 * 2728 * Initialize the route table for this bridge. 2729 */ 2730 static int 2731 bridge_rtable_init(struct bridge_softc *sc) 2732 { 2733 int i; 2734 2735 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2736 M_DEVBUF, M_NOWAIT); 2737 if (sc->sc_rthash == NULL) 2738 return (ENOMEM); 2739 2740 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2741 LIST_INIT(&sc->sc_rthash[i]); 2742 2743 sc->sc_rthash_key = arc4random(); 2744 2745 LIST_INIT(&sc->sc_rtlist); 2746 2747 return (0); 2748 } 2749 2750 /* 2751 * bridge_rtable_fini: 2752 * 2753 * Deconstruct the route table for this bridge. 2754 */ 2755 static void 2756 bridge_rtable_fini(struct bridge_softc *sc) 2757 { 2758 2759 KASSERT(sc->sc_brtcnt == 0, 2760 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2761 free(sc->sc_rthash, M_DEVBUF); 2762 } 2763 2764 /* 2765 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2766 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2767 */ 2768 #define mix(a, b, c) \ 2769 do { \ 2770 a -= b; a -= c; a ^= (c >> 13); \ 2771 b -= c; b -= a; b ^= (a << 8); \ 2772 c -= a; c -= b; c ^= (b >> 13); \ 2773 a -= b; a -= c; a ^= (c >> 12); \ 2774 b -= c; b -= a; b ^= (a << 16); \ 2775 c -= a; c -= b; c ^= (b >> 5); \ 2776 a -= b; a -= c; a ^= (c >> 3); \ 2777 b -= c; b -= a; b ^= (a << 10); \ 2778 c -= a; c -= b; c ^= (b >> 15); \ 2779 } while (/*CONSTCOND*/0) 2780 2781 static __inline uint32_t 2782 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2783 { 2784 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2785 2786 b += addr[5] << 8; 2787 b += addr[4]; 2788 a += addr[3] << 24; 2789 a += addr[2] << 16; 2790 a += addr[1] << 8; 2791 a += addr[0]; 2792 2793 mix(a, b, c); 2794 2795 return (c & BRIDGE_RTHASH_MASK); 2796 } 2797 2798 #undef mix 2799 2800 static int 2801 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2802 { 2803 int i, d; 2804 2805 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2806 d = ((int)a[i]) - ((int)b[i]); 2807 } 2808 2809 return (d); 2810 } 2811 2812 /* 2813 * bridge_rtnode_lookup: 2814 * 2815 * Look up a bridge route node for the specified destination. Compare the 2816 * vlan id or if zero then just return the first match. 2817 */ 2818 static struct bridge_rtnode * 2819 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2820 { 2821 struct bridge_rtnode *brt; 2822 uint32_t hash; 2823 int dir; 2824 2825 BRIDGE_LOCK_ASSERT(sc); 2826 2827 hash = bridge_rthash(sc, addr); 2828 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2829 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2830 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2831 return (brt); 2832 if (dir > 0) 2833 return (NULL); 2834 } 2835 2836 return (NULL); 2837 } 2838 2839 /* 2840 * bridge_rtnode_insert: 2841 * 2842 * Insert the specified bridge node into the route table. We 2843 * assume the entry is not already in the table. 2844 */ 2845 static int 2846 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2847 { 2848 struct bridge_rtnode *lbrt; 2849 uint32_t hash; 2850 int dir; 2851 2852 BRIDGE_LOCK_ASSERT(sc); 2853 2854 hash = bridge_rthash(sc, brt->brt_addr); 2855 2856 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2857 if (lbrt == NULL) { 2858 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2859 goto out; 2860 } 2861 2862 do { 2863 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2864 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2865 return (EEXIST); 2866 if (dir > 0) { 2867 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2868 goto out; 2869 } 2870 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2871 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2872 goto out; 2873 } 2874 lbrt = LIST_NEXT(lbrt, brt_hash); 2875 } while (lbrt != NULL); 2876 2877 #ifdef DIAGNOSTIC 2878 panic("bridge_rtnode_insert: impossible"); 2879 #endif 2880 2881 out: 2882 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2883 sc->sc_brtcnt++; 2884 2885 return (0); 2886 } 2887 2888 /* 2889 * bridge_rtnode_destroy: 2890 * 2891 * Destroy a bridge rtnode. 2892 */ 2893 static void 2894 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2895 { 2896 BRIDGE_LOCK_ASSERT(sc); 2897 2898 LIST_REMOVE(brt, brt_hash); 2899 2900 LIST_REMOVE(brt, brt_list); 2901 sc->sc_brtcnt--; 2902 brt->brt_dst->bif_addrcnt--; 2903 uma_zfree(bridge_rtnode_zone, brt); 2904 } 2905 2906 /* 2907 * bridge_rtable_expire: 2908 * 2909 * Set the expiry time for all routes on an interface. 2910 */ 2911 static void 2912 bridge_rtable_expire(struct ifnet *ifp, int age) 2913 { 2914 struct bridge_softc *sc = ifp->if_bridge; 2915 struct bridge_rtnode *brt; 2916 2917 BRIDGE_LOCK(sc); 2918 2919 /* 2920 * If the age is zero then flush, otherwise set all the expiry times to 2921 * age for the interface 2922 */ 2923 if (age == 0) 2924 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2925 else { 2926 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2927 /* Cap the expiry time to 'age' */ 2928 if (brt->brt_ifp == ifp && 2929 brt->brt_expire > time_uptime + age && 2930 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2931 brt->brt_expire = time_uptime + age; 2932 } 2933 } 2934 BRIDGE_UNLOCK(sc); 2935 } 2936 2937 /* 2938 * bridge_state_change: 2939 * 2940 * Callback from the bridgestp code when a port changes states. 2941 */ 2942 static void 2943 bridge_state_change(struct ifnet *ifp, int state) 2944 { 2945 struct bridge_softc *sc = ifp->if_bridge; 2946 static const char *stpstates[] = { 2947 "disabled", 2948 "listening", 2949 "learning", 2950 "forwarding", 2951 "blocking", 2952 "discarding" 2953 }; 2954 2955 if (log_stp) 2956 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2957 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2958 } 2959 2960 /* 2961 * Send bridge packets through pfil if they are one of the types pfil can deal 2962 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2963 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2964 * that interface. 2965 */ 2966 static int 2967 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2968 { 2969 int snap, error, i, hlen; 2970 struct ether_header *eh1, eh2; 2971 struct ip_fw_args args; 2972 struct ip *ip; 2973 struct llc llc1; 2974 u_int16_t ether_type; 2975 2976 snap = 0; 2977 error = -1; /* Default error if not error == 0 */ 2978 2979 #if 0 2980 /* we may return with the IP fields swapped, ensure its not shared */ 2981 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2982 #endif 2983 2984 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2985 return (0); /* filtering is disabled */ 2986 2987 i = min((*mp)->m_pkthdr.len, max_protohdr); 2988 if ((*mp)->m_len < i) { 2989 *mp = m_pullup(*mp, i); 2990 if (*mp == NULL) { 2991 printf("%s: m_pullup failed\n", __func__); 2992 return (-1); 2993 } 2994 } 2995 2996 eh1 = mtod(*mp, struct ether_header *); 2997 ether_type = ntohs(eh1->ether_type); 2998 2999 /* 3000 * Check for SNAP/LLC. 3001 */ 3002 if (ether_type < ETHERMTU) { 3003 struct llc *llc2 = (struct llc *)(eh1 + 1); 3004 3005 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3006 llc2->llc_dsap == LLC_SNAP_LSAP && 3007 llc2->llc_ssap == LLC_SNAP_LSAP && 3008 llc2->llc_control == LLC_UI) { 3009 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3010 snap = 1; 3011 } 3012 } 3013 3014 /* 3015 * If we're trying to filter bridge traffic, don't look at anything 3016 * other than IP and ARP traffic. If the filter doesn't understand 3017 * IPv6, don't allow IPv6 through the bridge either. This is lame 3018 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3019 * but of course we don't have an AppleTalk filter to begin with. 3020 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3021 * ARP traffic.) 3022 */ 3023 switch (ether_type) { 3024 case ETHERTYPE_ARP: 3025 case ETHERTYPE_REVARP: 3026 if (pfil_ipfw_arp == 0) 3027 return (0); /* Automatically pass */ 3028 break; 3029 3030 case ETHERTYPE_IP: 3031 #ifdef INET6 3032 case ETHERTYPE_IPV6: 3033 #endif /* INET6 */ 3034 break; 3035 default: 3036 /* 3037 * Check to see if the user wants to pass non-ip 3038 * packets, these will not be checked by pfil(9) and 3039 * passed unconditionally so the default is to drop. 3040 */ 3041 if (pfil_onlyip) 3042 goto bad; 3043 } 3044 3045 /* Strip off the Ethernet header and keep a copy. */ 3046 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3047 m_adj(*mp, ETHER_HDR_LEN); 3048 3049 /* Strip off snap header, if present */ 3050 if (snap) { 3051 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3052 m_adj(*mp, sizeof(struct llc)); 3053 } 3054 3055 /* 3056 * Check the IP header for alignment and errors 3057 */ 3058 if (dir == PFIL_IN) { 3059 switch (ether_type) { 3060 case ETHERTYPE_IP: 3061 error = bridge_ip_checkbasic(mp); 3062 break; 3063 #ifdef INET6 3064 case ETHERTYPE_IPV6: 3065 error = bridge_ip6_checkbasic(mp); 3066 break; 3067 #endif /* INET6 */ 3068 default: 3069 error = 0; 3070 } 3071 if (error) 3072 goto bad; 3073 } 3074 3075 /* XXX this section is also in if_ethersubr.c */ 3076 // XXX PFIL_OUT or DIR_OUT ? 3077 if (V_ip_fw_chk_ptr && pfil_ipfw != 0 && 3078 dir == PFIL_OUT && ifp != NULL) { 3079 struct m_tag *mtag; 3080 3081 error = -1; 3082 /* fetch the start point from existing tags, if any */ 3083 mtag = m_tag_locate(*mp, MTAG_IPFW_RULE, 0, NULL); 3084 if (mtag == NULL) { 3085 args.rule.slot = 0; 3086 } else { 3087 struct ipfw_rule_ref *r; 3088 3089 /* XXX can we free the tag after use ? */ 3090 mtag->m_tag_id = PACKET_TAG_NONE; 3091 r = (struct ipfw_rule_ref *)(mtag + 1); 3092 /* packet already partially processed ? */ 3093 if (r->info & IPFW_ONEPASS) 3094 goto ipfwpass; 3095 args.rule = *r; 3096 } 3097 3098 args.m = *mp; 3099 args.oif = ifp; 3100 args.next_hop = NULL; 3101 args.next_hop6 = NULL; 3102 args.eh = &eh2; 3103 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3104 i = V_ip_fw_chk_ptr(&args); 3105 *mp = args.m; 3106 3107 if (*mp == NULL) 3108 return (error); 3109 3110 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) { 3111 3112 /* put the Ethernet header back on */ 3113 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3114 if (*mp == NULL) 3115 return (error); 3116 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3117 3118 /* 3119 * Pass the pkt to dummynet, which consumes it. The 3120 * packet will return to us via bridge_dummynet(). 3121 */ 3122 args.oif = ifp; 3123 ip_dn_io_ptr(mp, DIR_FWD | PROTO_IFB, &args); 3124 return (error); 3125 } 3126 3127 if (i != IP_FW_PASS) /* drop */ 3128 goto bad; 3129 } 3130 3131 ipfwpass: 3132 error = 0; 3133 3134 /* 3135 * Run the packet through pfil 3136 */ 3137 switch (ether_type) { 3138 case ETHERTYPE_IP: 3139 /* 3140 * before calling the firewall, swap fields the same as 3141 * IP does. here we assume the header is contiguous 3142 */ 3143 ip = mtod(*mp, struct ip *); 3144 3145 ip->ip_len = ntohs(ip->ip_len); 3146 ip->ip_off = ntohs(ip->ip_off); 3147 3148 /* 3149 * Run pfil on the member interface and the bridge, both can 3150 * be skipped by clearing pfil_member or pfil_bridge. 3151 * 3152 * Keep the order: 3153 * in_if -> bridge_if -> out_if 3154 */ 3155 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3156 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3157 dir, NULL); 3158 3159 if (*mp == NULL || error != 0) /* filter may consume */ 3160 break; 3161 3162 if (pfil_member && ifp != NULL) 3163 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3164 dir, NULL); 3165 3166 if (*mp == NULL || error != 0) /* filter may consume */ 3167 break; 3168 3169 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3170 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3171 dir, NULL); 3172 3173 if (*mp == NULL || error != 0) /* filter may consume */ 3174 break; 3175 3176 /* check if we need to fragment the packet */ 3177 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3178 i = (*mp)->m_pkthdr.len; 3179 if (i > ifp->if_mtu) { 3180 error = bridge_fragment(ifp, *mp, &eh2, snap, 3181 &llc1); 3182 return (error); 3183 } 3184 } 3185 3186 /* Recalculate the ip checksum and restore byte ordering */ 3187 ip = mtod(*mp, struct ip *); 3188 hlen = ip->ip_hl << 2; 3189 if (hlen < sizeof(struct ip)) 3190 goto bad; 3191 if (hlen > (*mp)->m_len) { 3192 if ((*mp = m_pullup(*mp, hlen)) == 0) 3193 goto bad; 3194 ip = mtod(*mp, struct ip *); 3195 if (ip == NULL) 3196 goto bad; 3197 } 3198 ip->ip_len = htons(ip->ip_len); 3199 ip->ip_off = htons(ip->ip_off); 3200 ip->ip_sum = 0; 3201 if (hlen == sizeof(struct ip)) 3202 ip->ip_sum = in_cksum_hdr(ip); 3203 else 3204 ip->ip_sum = in_cksum(*mp, hlen); 3205 3206 break; 3207 #ifdef INET6 3208 case ETHERTYPE_IPV6: 3209 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3210 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3211 dir, NULL); 3212 3213 if (*mp == NULL || error != 0) /* filter may consume */ 3214 break; 3215 3216 if (pfil_member && ifp != NULL) 3217 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3218 dir, NULL); 3219 3220 if (*mp == NULL || error != 0) /* filter may consume */ 3221 break; 3222 3223 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3224 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3225 dir, NULL); 3226 break; 3227 #endif 3228 default: 3229 error = 0; 3230 break; 3231 } 3232 3233 if (*mp == NULL) 3234 return (error); 3235 if (error != 0) 3236 goto bad; 3237 3238 error = -1; 3239 3240 /* 3241 * Finally, put everything back the way it was and return 3242 */ 3243 if (snap) { 3244 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3245 if (*mp == NULL) 3246 return (error); 3247 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3248 } 3249 3250 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3251 if (*mp == NULL) 3252 return (error); 3253 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3254 3255 return (0); 3256 3257 bad: 3258 m_freem(*mp); 3259 *mp = NULL; 3260 return (error); 3261 } 3262 3263 /* 3264 * Perform basic checks on header size since 3265 * pfil assumes ip_input has already processed 3266 * it for it. Cut-and-pasted from ip_input.c. 3267 * Given how simple the IPv6 version is, 3268 * does the IPv4 version really need to be 3269 * this complicated? 3270 * 3271 * XXX Should we update ipstat here, or not? 3272 * XXX Right now we update ipstat but not 3273 * XXX csum_counter. 3274 */ 3275 static int 3276 bridge_ip_checkbasic(struct mbuf **mp) 3277 { 3278 struct mbuf *m = *mp; 3279 struct ip *ip; 3280 int len, hlen; 3281 u_short sum; 3282 3283 if (*mp == NULL) 3284 return (-1); 3285 3286 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3287 if ((m = m_copyup(m, sizeof(struct ip), 3288 (max_linkhdr + 3) & ~3)) == NULL) { 3289 /* XXXJRT new stat, please */ 3290 KMOD_IPSTAT_INC(ips_toosmall); 3291 goto bad; 3292 } 3293 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3294 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3295 KMOD_IPSTAT_INC(ips_toosmall); 3296 goto bad; 3297 } 3298 } 3299 ip = mtod(m, struct ip *); 3300 if (ip == NULL) goto bad; 3301 3302 if (ip->ip_v != IPVERSION) { 3303 KMOD_IPSTAT_INC(ips_badvers); 3304 goto bad; 3305 } 3306 hlen = ip->ip_hl << 2; 3307 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3308 KMOD_IPSTAT_INC(ips_badhlen); 3309 goto bad; 3310 } 3311 if (hlen > m->m_len) { 3312 if ((m = m_pullup(m, hlen)) == 0) { 3313 KMOD_IPSTAT_INC(ips_badhlen); 3314 goto bad; 3315 } 3316 ip = mtod(m, struct ip *); 3317 if (ip == NULL) goto bad; 3318 } 3319 3320 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3321 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3322 } else { 3323 if (hlen == sizeof(struct ip)) { 3324 sum = in_cksum_hdr(ip); 3325 } else { 3326 sum = in_cksum(m, hlen); 3327 } 3328 } 3329 if (sum) { 3330 KMOD_IPSTAT_INC(ips_badsum); 3331 goto bad; 3332 } 3333 3334 /* Retrieve the packet length. */ 3335 len = ntohs(ip->ip_len); 3336 3337 /* 3338 * Check for additional length bogosity 3339 */ 3340 if (len < hlen) { 3341 KMOD_IPSTAT_INC(ips_badlen); 3342 goto bad; 3343 } 3344 3345 /* 3346 * Check that the amount of data in the buffers 3347 * is as at least much as the IP header would have us expect. 3348 * Drop packet if shorter than we expect. 3349 */ 3350 if (m->m_pkthdr.len < len) { 3351 KMOD_IPSTAT_INC(ips_tooshort); 3352 goto bad; 3353 } 3354 3355 /* Checks out, proceed */ 3356 *mp = m; 3357 return (0); 3358 3359 bad: 3360 *mp = m; 3361 return (-1); 3362 } 3363 3364 #ifdef INET6 3365 /* 3366 * Same as above, but for IPv6. 3367 * Cut-and-pasted from ip6_input.c. 3368 * XXX Should we update ip6stat, or not? 3369 */ 3370 static int 3371 bridge_ip6_checkbasic(struct mbuf **mp) 3372 { 3373 struct mbuf *m = *mp; 3374 struct ip6_hdr *ip6; 3375 3376 /* 3377 * If the IPv6 header is not aligned, slurp it up into a new 3378 * mbuf with space for link headers, in the event we forward 3379 * it. Otherwise, if it is aligned, make sure the entire base 3380 * IPv6 header is in the first mbuf of the chain. 3381 */ 3382 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3383 struct ifnet *inifp = m->m_pkthdr.rcvif; 3384 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3385 (max_linkhdr + 3) & ~3)) == NULL) { 3386 /* XXXJRT new stat, please */ 3387 V_ip6stat.ip6s_toosmall++; 3388 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3389 goto bad; 3390 } 3391 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3392 struct ifnet *inifp = m->m_pkthdr.rcvif; 3393 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3394 V_ip6stat.ip6s_toosmall++; 3395 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3396 goto bad; 3397 } 3398 } 3399 3400 ip6 = mtod(m, struct ip6_hdr *); 3401 3402 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3403 V_ip6stat.ip6s_badvers++; 3404 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3405 goto bad; 3406 } 3407 3408 /* Checks out, proceed */ 3409 *mp = m; 3410 return (0); 3411 3412 bad: 3413 *mp = m; 3414 return (-1); 3415 } 3416 #endif /* INET6 */ 3417 3418 /* 3419 * bridge_fragment: 3420 * 3421 * Return a fragmented mbuf chain. 3422 */ 3423 static int 3424 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3425 int snap, struct llc *llc) 3426 { 3427 struct mbuf *m0; 3428 struct ip *ip; 3429 int error = -1; 3430 3431 if (m->m_len < sizeof(struct ip) && 3432 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3433 goto out; 3434 ip = mtod(m, struct ip *); 3435 3436 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3437 CSUM_DELAY_IP); 3438 if (error) 3439 goto out; 3440 3441 /* walk the chain and re-add the Ethernet header */ 3442 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3443 if (error == 0) { 3444 if (snap) { 3445 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3446 if (m0 == NULL) { 3447 error = ENOBUFS; 3448 continue; 3449 } 3450 bcopy(llc, mtod(m0, caddr_t), 3451 sizeof(struct llc)); 3452 } 3453 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3454 if (m0 == NULL) { 3455 error = ENOBUFS; 3456 continue; 3457 } 3458 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3459 } else 3460 m_freem(m); 3461 } 3462 3463 if (error == 0) 3464 KMOD_IPSTAT_INC(ips_fragmented); 3465 3466 return (error); 3467 3468 out: 3469 if (m != NULL) 3470 m_freem(m); 3471 return (error); 3472 } 3473