1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 #include "opt_carp.h" 83 84 #include <sys/param.h> 85 #include <sys/mbuf.h> 86 #include <sys/malloc.h> 87 #include <sys/protosw.h> 88 #include <sys/systm.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 #include <sys/rwlock.h> 104 #include <sys/vimage.h> 105 106 #include <net/bpf.h> 107 #include <net/if.h> 108 #include <net/if_clone.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_var.h> 112 #include <net/pfil.h> 113 114 #include <netinet/in.h> /* for struct arpcom */ 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #include <netinet/vinet.h> 120 #ifdef INET6 121 #include <netinet/ip6.h> 122 #include <netinet6/ip6_var.h> 123 #include <netinet6/vinet6.h> 124 #endif 125 #if defined(INET) || defined(INET6) 126 #ifdef DEV_CARP 127 #include <netinet/ip_carp.h> 128 #endif 129 #endif 130 #include <machine/in_cksum.h> 131 #include <netinet/if_ether.h> /* for struct arpcom */ 132 #include <net/bridgestp.h> 133 #include <net/if_bridgevar.h> 134 #include <net/if_llc.h> 135 #include <net/if_vlan_var.h> 136 137 #include <net/route.h> 138 #include <netinet/ip_fw.h> 139 #include <netinet/ip_dummynet.h> 140 141 /* 142 * Size of the route hash table. Must be a power of two. 143 */ 144 #ifndef BRIDGE_RTHASH_SIZE 145 #define BRIDGE_RTHASH_SIZE 1024 146 #endif 147 148 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 149 150 /* 151 * Maximum number of addresses to cache. 152 */ 153 #ifndef BRIDGE_RTABLE_MAX 154 #define BRIDGE_RTABLE_MAX 100 155 #endif 156 157 /* 158 * Timeout (in seconds) for entries learned dynamically. 159 */ 160 #ifndef BRIDGE_RTABLE_TIMEOUT 161 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 162 #endif 163 164 /* 165 * Number of seconds between walks of the route list. 166 */ 167 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 168 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 169 #endif 170 171 /* 172 * List of capabilities to possibly mask on the member interface. 173 */ 174 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 175 176 /* 177 * Bridge interface list entry. 178 */ 179 struct bridge_iflist { 180 LIST_ENTRY(bridge_iflist) bif_next; 181 struct ifnet *bif_ifp; /* member if */ 182 struct bstp_port bif_stp; /* STP state */ 183 uint32_t bif_flags; /* member if flags */ 184 int bif_savedcaps; /* saved capabilities */ 185 uint32_t bif_addrmax; /* max # of addresses */ 186 uint32_t bif_addrcnt; /* cur. # of addresses */ 187 uint32_t bif_addrexceeded;/* # of address violations */ 188 }; 189 190 /* 191 * Bridge route node. 192 */ 193 struct bridge_rtnode { 194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 196 struct bridge_iflist *brt_dst; /* destination if */ 197 unsigned long brt_expire; /* expiration time */ 198 uint8_t brt_flags; /* address flags */ 199 uint8_t brt_addr[ETHER_ADDR_LEN]; 200 uint16_t brt_vlan; /* vlan id */ 201 }; 202 #define brt_ifp brt_dst->bif_ifp 203 204 /* 205 * Software state for each bridge. 206 */ 207 struct bridge_softc { 208 struct ifnet *sc_ifp; /* make this an interface */ 209 LIST_ENTRY(bridge_softc) sc_list; 210 struct mtx sc_mtx; 211 struct cv sc_cv; 212 uint32_t sc_brtmax; /* max # of addresses */ 213 uint32_t sc_brtcnt; /* cur. # of addresses */ 214 uint32_t sc_brttimeout; /* rt timeout in seconds */ 215 struct callout sc_brcallout; /* bridge callout */ 216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 221 uint32_t sc_rthash_key; /* key for hash */ 222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 223 struct bstp_state sc_stp; /* STP state */ 224 uint32_t sc_brtexceeded; /* # of cache drops */ 225 struct ifnet *sc_ifaddr; /* member mac copied from */ 226 u_char sc_defaddr[6]; /* Default MAC address */ 227 }; 228 229 static struct mtx bridge_list_mtx; 230 eventhandler_tag bridge_detach_cookie = NULL; 231 232 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 233 234 uma_zone_t bridge_rtnode_zone; 235 236 static int bridge_clone_create(struct if_clone *, int, caddr_t); 237 static void bridge_clone_destroy(struct ifnet *); 238 239 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 240 static void bridge_mutecaps(struct bridge_softc *); 241 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 242 int); 243 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 244 static void bridge_init(void *); 245 static void bridge_dummynet(struct mbuf *, struct ifnet *); 246 static void bridge_stop(struct ifnet *, int); 247 static void bridge_start(struct ifnet *); 248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 249 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 250 struct rtentry *); 251 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 252 struct mbuf *); 253 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 254 255 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 256 struct mbuf *m); 257 258 static void bridge_timer(void *); 259 260 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 261 struct mbuf *, int); 262 static void bridge_span(struct bridge_softc *, struct mbuf *); 263 264 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 265 uint16_t, struct bridge_iflist *, int, uint8_t); 266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 267 uint16_t); 268 static void bridge_rttrim(struct bridge_softc *); 269 static void bridge_rtage(struct bridge_softc *); 270 static void bridge_rtflush(struct bridge_softc *, int); 271 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 272 uint16_t); 273 274 static int bridge_rtable_init(struct bridge_softc *); 275 static void bridge_rtable_fini(struct bridge_softc *); 276 277 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 279 const uint8_t *, uint16_t); 280 static int bridge_rtnode_insert(struct bridge_softc *, 281 struct bridge_rtnode *); 282 static void bridge_rtnode_destroy(struct bridge_softc *, 283 struct bridge_rtnode *); 284 static void bridge_rtable_expire(struct ifnet *, int); 285 static void bridge_state_change(struct ifnet *, int); 286 287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 288 const char *name); 289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 290 struct ifnet *ifp); 291 static void bridge_delete_member(struct bridge_softc *, 292 struct bridge_iflist *, int); 293 static void bridge_delete_span(struct bridge_softc *, 294 struct bridge_iflist *); 295 296 static int bridge_ioctl_add(struct bridge_softc *, void *); 297 static int bridge_ioctl_del(struct bridge_softc *, void *); 298 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 299 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_scache(struct bridge_softc *, void *); 301 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 303 static int bridge_ioctl_rts(struct bridge_softc *, void *); 304 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 305 static int bridge_ioctl_sto(struct bridge_softc *, void *); 306 static int bridge_ioctl_gto(struct bridge_softc *, void *); 307 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 308 static int bridge_ioctl_flush(struct bridge_softc *, void *); 309 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 310 static int bridge_ioctl_spri(struct bridge_softc *, void *); 311 static int bridge_ioctl_ght(struct bridge_softc *, void *); 312 static int bridge_ioctl_sht(struct bridge_softc *, void *); 313 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 314 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_gma(struct bridge_softc *, void *); 316 static int bridge_ioctl_sma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 320 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 321 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 323 static int bridge_ioctl_grte(struct bridge_softc *, void *); 324 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 325 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 326 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 327 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 328 int); 329 static int bridge_ip_checkbasic(struct mbuf **mp); 330 #ifdef INET6 331 static int bridge_ip6_checkbasic(struct mbuf **mp); 332 #endif /* INET6 */ 333 static int bridge_fragment(struct ifnet *, struct mbuf *, 334 struct ether_header *, int, struct llc *); 335 336 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 337 #define VLANTAGOF(_m) \ 338 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 339 340 static struct bstp_cb_ops bridge_ops = { 341 .bcb_state = bridge_state_change, 342 .bcb_rtage = bridge_rtable_expire 343 }; 344 345 SYSCTL_DECL(_net_link); 346 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 347 348 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 349 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 350 static int pfil_member = 1; /* run pfil hooks on the member interface */ 351 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 352 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 353 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 354 locally destined packets */ 355 static int log_stp = 0; /* log STP state changes */ 356 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 357 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 358 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 359 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 360 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 362 &pfil_bridge, 0, "Packet filter on the bridge interface"); 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 364 &pfil_member, 0, "Packet filter on the member interface"); 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 366 &pfil_local_phys, 0, 367 "Packet filter on the physical interface for locally destined packets"); 368 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 369 &log_stp, 0, "Log STP state changes"); 370 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 371 &bridge_inherit_mac, 0, 372 "Inherit MAC address from the first bridge member"); 373 374 struct bridge_control { 375 int (*bc_func)(struct bridge_softc *, void *); 376 int bc_argsize; 377 int bc_flags; 378 }; 379 380 #define BC_F_COPYIN 0x01 /* copy arguments in */ 381 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 382 #define BC_F_SUSER 0x04 /* do super-user check */ 383 384 const struct bridge_control bridge_control_table[] = { 385 { bridge_ioctl_add, sizeof(struct ifbreq), 386 BC_F_COPYIN|BC_F_SUSER }, 387 { bridge_ioctl_del, sizeof(struct ifbreq), 388 BC_F_COPYIN|BC_F_SUSER }, 389 390 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 391 BC_F_COPYIN|BC_F_COPYOUT }, 392 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 393 BC_F_COPYIN|BC_F_SUSER }, 394 395 { bridge_ioctl_scache, sizeof(struct ifbrparam), 396 BC_F_COPYIN|BC_F_SUSER }, 397 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 398 BC_F_COPYOUT }, 399 400 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 401 BC_F_COPYIN|BC_F_COPYOUT }, 402 { bridge_ioctl_rts, sizeof(struct ifbaconf), 403 BC_F_COPYIN|BC_F_COPYOUT }, 404 405 { bridge_ioctl_saddr, sizeof(struct ifbareq), 406 BC_F_COPYIN|BC_F_SUSER }, 407 408 { bridge_ioctl_sto, sizeof(struct ifbrparam), 409 BC_F_COPYIN|BC_F_SUSER }, 410 { bridge_ioctl_gto, sizeof(struct ifbrparam), 411 BC_F_COPYOUT }, 412 413 { bridge_ioctl_daddr, sizeof(struct ifbareq), 414 BC_F_COPYIN|BC_F_SUSER }, 415 416 { bridge_ioctl_flush, sizeof(struct ifbreq), 417 BC_F_COPYIN|BC_F_SUSER }, 418 419 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 420 BC_F_COPYOUT }, 421 { bridge_ioctl_spri, sizeof(struct ifbrparam), 422 BC_F_COPYIN|BC_F_SUSER }, 423 424 { bridge_ioctl_ght, sizeof(struct ifbrparam), 425 BC_F_COPYOUT }, 426 { bridge_ioctl_sht, sizeof(struct ifbrparam), 427 BC_F_COPYIN|BC_F_SUSER }, 428 429 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 430 BC_F_COPYOUT }, 431 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 432 BC_F_COPYIN|BC_F_SUSER }, 433 434 { bridge_ioctl_gma, sizeof(struct ifbrparam), 435 BC_F_COPYOUT }, 436 { bridge_ioctl_sma, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 439 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 440 BC_F_COPYIN|BC_F_SUSER }, 441 442 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 443 BC_F_COPYIN|BC_F_SUSER }, 444 445 { bridge_ioctl_addspan, sizeof(struct ifbreq), 446 BC_F_COPYIN|BC_F_SUSER }, 447 { bridge_ioctl_delspan, sizeof(struct ifbreq), 448 BC_F_COPYIN|BC_F_SUSER }, 449 450 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 451 BC_F_COPYOUT }, 452 453 { bridge_ioctl_grte, sizeof(struct ifbrparam), 454 BC_F_COPYOUT }, 455 456 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 457 BC_F_COPYIN|BC_F_COPYOUT }, 458 459 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 460 BC_F_COPYIN|BC_F_SUSER }, 461 462 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 463 BC_F_COPYIN|BC_F_SUSER }, 464 465 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 466 BC_F_COPYIN|BC_F_SUSER }, 467 468 }; 469 const int bridge_control_table_size = 470 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 471 472 LIST_HEAD(, bridge_softc) bridge_list; 473 474 IFC_SIMPLE_DECLARE(bridge, 0); 475 476 static int 477 bridge_modevent(module_t mod, int type, void *data) 478 { 479 480 switch (type) { 481 case MOD_LOAD: 482 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 483 if_clone_attach(&bridge_cloner); 484 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 485 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 486 UMA_ALIGN_PTR, 0); 487 LIST_INIT(&bridge_list); 488 bridge_input_p = bridge_input; 489 bridge_output_p = bridge_output; 490 bridge_dn_p = bridge_dummynet; 491 bridge_detach_cookie = EVENTHANDLER_REGISTER( 492 ifnet_departure_event, bridge_ifdetach, NULL, 493 EVENTHANDLER_PRI_ANY); 494 break; 495 case MOD_UNLOAD: 496 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 497 bridge_detach_cookie); 498 if_clone_detach(&bridge_cloner); 499 uma_zdestroy(bridge_rtnode_zone); 500 bridge_input_p = NULL; 501 bridge_output_p = NULL; 502 bridge_dn_p = NULL; 503 mtx_destroy(&bridge_list_mtx); 504 break; 505 default: 506 return (EOPNOTSUPP); 507 } 508 return (0); 509 } 510 511 static moduledata_t bridge_mod = { 512 "if_bridge", 513 bridge_modevent, 514 0 515 }; 516 517 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 518 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 519 520 /* 521 * handler for net.link.bridge.pfil_ipfw 522 */ 523 static int 524 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 525 { 526 int enable = pfil_ipfw; 527 int error; 528 529 error = sysctl_handle_int(oidp, &enable, 0, req); 530 enable = (enable) ? 1 : 0; 531 532 if (enable != pfil_ipfw) { 533 pfil_ipfw = enable; 534 535 /* 536 * Disable pfil so that ipfw doesnt run twice, if the user 537 * really wants both then they can re-enable pfil_bridge and/or 538 * pfil_member. Also allow non-ip packets as ipfw can filter by 539 * layer2 type. 540 */ 541 if (pfil_ipfw) { 542 pfil_onlyip = 0; 543 pfil_bridge = 0; 544 pfil_member = 0; 545 } 546 } 547 548 return (error); 549 } 550 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 551 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 552 553 /* 554 * bridge_clone_create: 555 * 556 * Create a new bridge instance. 557 */ 558 static int 559 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 560 { 561 struct bridge_softc *sc, *sc2; 562 struct ifnet *bifp, *ifp; 563 int retry; 564 565 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 566 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 567 if (ifp == NULL) { 568 free(sc, M_DEVBUF); 569 return (ENOSPC); 570 } 571 572 BRIDGE_LOCK_INIT(sc); 573 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 574 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 575 576 /* Initialize our routing table. */ 577 bridge_rtable_init(sc); 578 579 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 580 581 LIST_INIT(&sc->sc_iflist); 582 LIST_INIT(&sc->sc_spanlist); 583 584 ifp->if_softc = sc; 585 if_initname(ifp, ifc->ifc_name, unit); 586 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 587 ifp->if_ioctl = bridge_ioctl; 588 ifp->if_start = bridge_start; 589 ifp->if_init = bridge_init; 590 ifp->if_type = IFT_BRIDGE; 591 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 592 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 593 IFQ_SET_READY(&ifp->if_snd); 594 595 /* 596 * Generate a random ethernet address with a locally administered 597 * address. 598 * 599 * Since we are using random ethernet addresses for the bridge, it is 600 * possible that we might have address collisions, so make sure that 601 * this hardware address isn't already in use on another bridge. 602 */ 603 for (retry = 1; retry != 0;) { 604 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 605 sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ 606 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 607 retry = 0; 608 mtx_lock(&bridge_list_mtx); 609 LIST_FOREACH(sc2, &bridge_list, sc_list) { 610 bifp = sc2->sc_ifp; 611 if (memcmp(sc->sc_defaddr, 612 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 613 retry = 1; 614 } 615 mtx_unlock(&bridge_list_mtx); 616 } 617 618 bstp_attach(&sc->sc_stp, &bridge_ops); 619 ether_ifattach(ifp, sc->sc_defaddr); 620 /* Now undo some of the damage... */ 621 ifp->if_baudrate = 0; 622 ifp->if_type = IFT_BRIDGE; 623 624 mtx_lock(&bridge_list_mtx); 625 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 626 mtx_unlock(&bridge_list_mtx); 627 628 return (0); 629 } 630 631 /* 632 * bridge_clone_destroy: 633 * 634 * Destroy a bridge instance. 635 */ 636 static void 637 bridge_clone_destroy(struct ifnet *ifp) 638 { 639 struct bridge_softc *sc = ifp->if_softc; 640 struct bridge_iflist *bif; 641 642 BRIDGE_LOCK(sc); 643 644 bridge_stop(ifp, 1); 645 ifp->if_flags &= ~IFF_UP; 646 647 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 648 bridge_delete_member(sc, bif, 0); 649 650 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 651 bridge_delete_span(sc, bif); 652 } 653 654 BRIDGE_UNLOCK(sc); 655 656 callout_drain(&sc->sc_brcallout); 657 658 mtx_lock(&bridge_list_mtx); 659 LIST_REMOVE(sc, sc_list); 660 mtx_unlock(&bridge_list_mtx); 661 662 bstp_detach(&sc->sc_stp); 663 ether_ifdetach(ifp); 664 if_free_type(ifp, IFT_ETHER); 665 666 /* Tear down the routing table. */ 667 bridge_rtable_fini(sc); 668 669 BRIDGE_LOCK_DESTROY(sc); 670 free(sc, M_DEVBUF); 671 } 672 673 /* 674 * bridge_ioctl: 675 * 676 * Handle a control request from the operator. 677 */ 678 static int 679 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 680 { 681 struct bridge_softc *sc = ifp->if_softc; 682 struct thread *td = curthread; 683 union { 684 struct ifbreq ifbreq; 685 struct ifbifconf ifbifconf; 686 struct ifbareq ifbareq; 687 struct ifbaconf ifbaconf; 688 struct ifbrparam ifbrparam; 689 struct ifbropreq ifbropreq; 690 } args; 691 struct ifdrv *ifd = (struct ifdrv *) data; 692 const struct bridge_control *bc; 693 int error = 0; 694 695 switch (cmd) { 696 697 case SIOCADDMULTI: 698 case SIOCDELMULTI: 699 break; 700 701 case SIOCGDRVSPEC: 702 case SIOCSDRVSPEC: 703 if (ifd->ifd_cmd >= bridge_control_table_size) { 704 error = EINVAL; 705 break; 706 } 707 bc = &bridge_control_table[ifd->ifd_cmd]; 708 709 if (cmd == SIOCGDRVSPEC && 710 (bc->bc_flags & BC_F_COPYOUT) == 0) { 711 error = EINVAL; 712 break; 713 } 714 else if (cmd == SIOCSDRVSPEC && 715 (bc->bc_flags & BC_F_COPYOUT) != 0) { 716 error = EINVAL; 717 break; 718 } 719 720 if (bc->bc_flags & BC_F_SUSER) { 721 error = priv_check(td, PRIV_NET_BRIDGE); 722 if (error) 723 break; 724 } 725 726 if (ifd->ifd_len != bc->bc_argsize || 727 ifd->ifd_len > sizeof(args)) { 728 error = EINVAL; 729 break; 730 } 731 732 bzero(&args, sizeof(args)); 733 if (bc->bc_flags & BC_F_COPYIN) { 734 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 735 if (error) 736 break; 737 } 738 739 BRIDGE_LOCK(sc); 740 error = (*bc->bc_func)(sc, &args); 741 BRIDGE_UNLOCK(sc); 742 if (error) 743 break; 744 745 if (bc->bc_flags & BC_F_COPYOUT) 746 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 747 748 break; 749 750 case SIOCSIFFLAGS: 751 if (!(ifp->if_flags & IFF_UP) && 752 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 753 /* 754 * If interface is marked down and it is running, 755 * then stop and disable it. 756 */ 757 BRIDGE_LOCK(sc); 758 bridge_stop(ifp, 1); 759 BRIDGE_UNLOCK(sc); 760 } else if ((ifp->if_flags & IFF_UP) && 761 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 762 /* 763 * If interface is marked up and it is stopped, then 764 * start it. 765 */ 766 (*ifp->if_init)(sc); 767 } 768 break; 769 770 case SIOCSIFMTU: 771 /* Do not allow the MTU to be changed on the bridge */ 772 error = EINVAL; 773 break; 774 775 default: 776 /* 777 * drop the lock as ether_ioctl() will call bridge_start() and 778 * cause the lock to be recursed. 779 */ 780 error = ether_ioctl(ifp, cmd, data); 781 break; 782 } 783 784 return (error); 785 } 786 787 /* 788 * bridge_mutecaps: 789 * 790 * Clear or restore unwanted capabilities on the member interface 791 */ 792 static void 793 bridge_mutecaps(struct bridge_softc *sc) 794 { 795 struct bridge_iflist *bif; 796 int enabled, mask; 797 798 /* Initial bitmask of capabilities to test */ 799 mask = BRIDGE_IFCAPS_MASK; 800 801 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 802 /* Every member must support it or its disabled */ 803 mask &= bif->bif_savedcaps; 804 } 805 806 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 807 enabled = bif->bif_ifp->if_capenable; 808 /* strip off mask bits and enable them again if allowed */ 809 enabled &= ~BRIDGE_IFCAPS_MASK; 810 enabled |= mask; 811 /* 812 * Receive offload can only be enabled if all members also 813 * support send offload. 814 */ 815 if ((enabled & IFCAP_TSO) == 0) 816 enabled &= ~IFCAP_LRO; 817 818 bridge_set_ifcap(sc, bif, enabled); 819 } 820 821 } 822 823 static void 824 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 825 { 826 struct ifnet *ifp = bif->bif_ifp; 827 struct ifreq ifr; 828 int error; 829 830 bzero(&ifr, sizeof(ifr)); 831 ifr.ifr_reqcap = set; 832 833 if (ifp->if_capenable != set) { 834 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 835 if (error) 836 if_printf(sc->sc_ifp, 837 "error setting interface capabilities on %s\n", 838 ifp->if_xname); 839 } 840 } 841 842 /* 843 * bridge_lookup_member: 844 * 845 * Lookup a bridge member interface. 846 */ 847 static struct bridge_iflist * 848 bridge_lookup_member(struct bridge_softc *sc, const char *name) 849 { 850 struct bridge_iflist *bif; 851 struct ifnet *ifp; 852 853 BRIDGE_LOCK_ASSERT(sc); 854 855 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 856 ifp = bif->bif_ifp; 857 if (strcmp(ifp->if_xname, name) == 0) 858 return (bif); 859 } 860 861 return (NULL); 862 } 863 864 /* 865 * bridge_lookup_member_if: 866 * 867 * Lookup a bridge member interface by ifnet*. 868 */ 869 static struct bridge_iflist * 870 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 871 { 872 struct bridge_iflist *bif; 873 874 BRIDGE_LOCK_ASSERT(sc); 875 876 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 877 if (bif->bif_ifp == member_ifp) 878 return (bif); 879 } 880 881 return (NULL); 882 } 883 884 /* 885 * bridge_delete_member: 886 * 887 * Delete the specified member interface. 888 */ 889 static void 890 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 891 int gone) 892 { 893 struct ifnet *ifs = bif->bif_ifp; 894 struct ifnet *fif = NULL; 895 896 BRIDGE_LOCK_ASSERT(sc); 897 898 if (bif->bif_flags & IFBIF_STP) 899 bstp_disable(&bif->bif_stp); 900 901 ifs->if_bridge = NULL; 902 BRIDGE_XLOCK(sc); 903 LIST_REMOVE(bif, bif_next); 904 BRIDGE_XDROP(sc); 905 906 /* 907 * If removing the interface that gave the bridge its mac address, set 908 * the mac address of the bridge to the address of the next member, or 909 * to its default address if no members are left. 910 */ 911 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 912 if (LIST_EMPTY(&sc->sc_iflist)) { 913 bcopy(sc->sc_defaddr, 914 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 915 sc->sc_ifaddr = NULL; 916 } else { 917 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 918 bcopy(IF_LLADDR(fif), 919 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 920 sc->sc_ifaddr = fif; 921 } 922 } 923 924 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 925 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 926 KASSERT(bif->bif_addrcnt == 0, 927 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 928 929 BRIDGE_UNLOCK(sc); 930 if (!gone) { 931 switch (ifs->if_type) { 932 case IFT_ETHER: 933 case IFT_L2VLAN: 934 /* 935 * Take the interface out of promiscuous mode. 936 */ 937 (void) ifpromisc(ifs, 0); 938 break; 939 940 case IFT_GIF: 941 break; 942 943 default: 944 #ifdef DIAGNOSTIC 945 panic("bridge_delete_member: impossible"); 946 #endif 947 break; 948 } 949 /* reneable any interface capabilities */ 950 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 951 } 952 bstp_destroy(&bif->bif_stp); /* prepare to free */ 953 BRIDGE_LOCK(sc); 954 free(bif, M_DEVBUF); 955 } 956 957 /* 958 * bridge_delete_span: 959 * 960 * Delete the specified span interface. 961 */ 962 static void 963 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 964 { 965 BRIDGE_LOCK_ASSERT(sc); 966 967 KASSERT(bif->bif_ifp->if_bridge == NULL, 968 ("%s: not a span interface", __func__)); 969 970 LIST_REMOVE(bif, bif_next); 971 free(bif, M_DEVBUF); 972 } 973 974 static int 975 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 976 { 977 struct ifbreq *req = arg; 978 struct bridge_iflist *bif = NULL; 979 struct ifnet *ifs; 980 int error = 0; 981 982 ifs = ifunit(req->ifbr_ifsname); 983 if (ifs == NULL) 984 return (ENOENT); 985 if (ifs->if_ioctl == NULL) /* must be supported */ 986 return (EINVAL); 987 988 /* If it's in the span list, it can't be a member. */ 989 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 990 if (ifs == bif->bif_ifp) 991 return (EBUSY); 992 993 /* Allow the first Ethernet member to define the MTU */ 994 if (ifs->if_type != IFT_GIF) { 995 if (LIST_EMPTY(&sc->sc_iflist)) 996 sc->sc_ifp->if_mtu = ifs->if_mtu; 997 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 998 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 999 ifs->if_xname); 1000 return (EINVAL); 1001 } 1002 } 1003 1004 if (ifs->if_bridge == sc) 1005 return (EEXIST); 1006 1007 if (ifs->if_bridge != NULL) 1008 return (EBUSY); 1009 1010 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1011 if (bif == NULL) 1012 return (ENOMEM); 1013 1014 bif->bif_ifp = ifs; 1015 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1016 bif->bif_savedcaps = ifs->if_capenable; 1017 1018 switch (ifs->if_type) { 1019 case IFT_ETHER: 1020 case IFT_L2VLAN: 1021 case IFT_GIF: 1022 /* permitted interface types */ 1023 break; 1024 default: 1025 error = EINVAL; 1026 goto out; 1027 } 1028 1029 /* 1030 * Assign the interface's MAC address to the bridge if it's the first 1031 * member and the MAC address of the bridge has not been changed from 1032 * the default randomly generated one. 1033 */ 1034 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1035 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1036 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1037 sc->sc_ifaddr = ifs; 1038 } 1039 1040 ifs->if_bridge = sc; 1041 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1042 /* 1043 * XXX: XLOCK HERE!?! 1044 * 1045 * NOTE: insert_***HEAD*** should be safe for the traversals. 1046 */ 1047 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1048 1049 /* Set interface capabilities to the intersection set of all members */ 1050 bridge_mutecaps(sc); 1051 1052 switch (ifs->if_type) { 1053 case IFT_ETHER: 1054 case IFT_L2VLAN: 1055 /* 1056 * Place the interface into promiscuous mode. 1057 */ 1058 BRIDGE_UNLOCK(sc); 1059 error = ifpromisc(ifs, 1); 1060 BRIDGE_LOCK(sc); 1061 break; 1062 } 1063 if (error) 1064 bridge_delete_member(sc, bif, 0); 1065 out: 1066 if (error) { 1067 if (bif != NULL) 1068 free(bif, M_DEVBUF); 1069 } 1070 return (error); 1071 } 1072 1073 static int 1074 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1075 { 1076 struct ifbreq *req = arg; 1077 struct bridge_iflist *bif; 1078 1079 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1080 if (bif == NULL) 1081 return (ENOENT); 1082 1083 bridge_delete_member(sc, bif, 0); 1084 1085 return (0); 1086 } 1087 1088 static int 1089 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1090 { 1091 struct ifbreq *req = arg; 1092 struct bridge_iflist *bif; 1093 struct bstp_port *bp; 1094 1095 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1096 if (bif == NULL) 1097 return (ENOENT); 1098 1099 bp = &bif->bif_stp; 1100 req->ifbr_ifsflags = bif->bif_flags; 1101 req->ifbr_state = bp->bp_state; 1102 req->ifbr_priority = bp->bp_priority; 1103 req->ifbr_path_cost = bp->bp_path_cost; 1104 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1105 req->ifbr_proto = bp->bp_protover; 1106 req->ifbr_role = bp->bp_role; 1107 req->ifbr_stpflags = bp->bp_flags; 1108 req->ifbr_addrcnt = bif->bif_addrcnt; 1109 req->ifbr_addrmax = bif->bif_addrmax; 1110 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1111 1112 /* Copy STP state options as flags */ 1113 if (bp->bp_operedge) 1114 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1115 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1116 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1117 if (bp->bp_ptp_link) 1118 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1119 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1120 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1121 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1122 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1123 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1124 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1125 return (0); 1126 } 1127 1128 static int 1129 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1130 { 1131 struct ifbreq *req = arg; 1132 struct bridge_iflist *bif; 1133 struct bstp_port *bp; 1134 int error; 1135 1136 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1137 if (bif == NULL) 1138 return (ENOENT); 1139 bp = &bif->bif_stp; 1140 1141 if (req->ifbr_ifsflags & IFBIF_SPAN) 1142 /* SPAN is readonly */ 1143 return (EINVAL); 1144 1145 if (req->ifbr_ifsflags & IFBIF_STP) { 1146 if ((bif->bif_flags & IFBIF_STP) == 0) { 1147 error = bstp_enable(&bif->bif_stp); 1148 if (error) 1149 return (error); 1150 } 1151 } else { 1152 if ((bif->bif_flags & IFBIF_STP) != 0) 1153 bstp_disable(&bif->bif_stp); 1154 } 1155 1156 /* Pass on STP flags */ 1157 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1158 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1159 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1160 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1161 1162 /* Save the bits relating to the bridge */ 1163 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1164 1165 return (0); 1166 } 1167 1168 static int 1169 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1170 { 1171 struct ifbrparam *param = arg; 1172 1173 sc->sc_brtmax = param->ifbrp_csize; 1174 bridge_rttrim(sc); 1175 1176 return (0); 1177 } 1178 1179 static int 1180 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbrparam *param = arg; 1183 1184 param->ifbrp_csize = sc->sc_brtmax; 1185 1186 return (0); 1187 } 1188 1189 static int 1190 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1191 { 1192 struct ifbifconf *bifc = arg; 1193 struct bridge_iflist *bif; 1194 struct ifbreq breq; 1195 char *buf, *outbuf; 1196 int count, buflen, len, error = 0; 1197 1198 count = 0; 1199 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1200 count++; 1201 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1202 count++; 1203 1204 buflen = sizeof(breq) * count; 1205 if (bifc->ifbic_len == 0) { 1206 bifc->ifbic_len = buflen; 1207 return (0); 1208 } 1209 BRIDGE_UNLOCK(sc); 1210 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1211 BRIDGE_LOCK(sc); 1212 1213 count = 0; 1214 buf = outbuf; 1215 len = min(bifc->ifbic_len, buflen); 1216 bzero(&breq, sizeof(breq)); 1217 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1218 if (len < sizeof(breq)) 1219 break; 1220 1221 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1222 sizeof(breq.ifbr_ifsname)); 1223 /* Fill in the ifbreq structure */ 1224 error = bridge_ioctl_gifflags(sc, &breq); 1225 if (error) 1226 break; 1227 memcpy(buf, &breq, sizeof(breq)); 1228 count++; 1229 buf += sizeof(breq); 1230 len -= sizeof(breq); 1231 } 1232 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1233 if (len < sizeof(breq)) 1234 break; 1235 1236 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1237 sizeof(breq.ifbr_ifsname)); 1238 breq.ifbr_ifsflags = bif->bif_flags; 1239 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1240 memcpy(buf, &breq, sizeof(breq)); 1241 count++; 1242 buf += sizeof(breq); 1243 len -= sizeof(breq); 1244 } 1245 1246 BRIDGE_UNLOCK(sc); 1247 bifc->ifbic_len = sizeof(breq) * count; 1248 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1249 BRIDGE_LOCK(sc); 1250 free(outbuf, M_TEMP); 1251 return (error); 1252 } 1253 1254 static int 1255 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1256 { 1257 struct ifbaconf *bac = arg; 1258 struct bridge_rtnode *brt; 1259 struct ifbareq bareq; 1260 char *buf, *outbuf; 1261 int count, buflen, len, error = 0; 1262 1263 if (bac->ifbac_len == 0) 1264 return (0); 1265 1266 count = 0; 1267 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1268 count++; 1269 buflen = sizeof(bareq) * count; 1270 1271 BRIDGE_UNLOCK(sc); 1272 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1273 BRIDGE_LOCK(sc); 1274 1275 count = 0; 1276 buf = outbuf; 1277 len = min(bac->ifbac_len, buflen); 1278 bzero(&bareq, sizeof(bareq)); 1279 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1280 if (len < sizeof(bareq)) 1281 goto out; 1282 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1283 sizeof(bareq.ifba_ifsname)); 1284 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1285 bareq.ifba_vlan = brt->brt_vlan; 1286 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1287 time_uptime < brt->brt_expire) 1288 bareq.ifba_expire = brt->brt_expire - time_uptime; 1289 else 1290 bareq.ifba_expire = 0; 1291 bareq.ifba_flags = brt->brt_flags; 1292 1293 memcpy(buf, &bareq, sizeof(bareq)); 1294 count++; 1295 buf += sizeof(bareq); 1296 len -= sizeof(bareq); 1297 } 1298 out: 1299 BRIDGE_UNLOCK(sc); 1300 bac->ifbac_len = sizeof(bareq) * count; 1301 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1302 BRIDGE_LOCK(sc); 1303 free(outbuf, M_TEMP); 1304 return (error); 1305 } 1306 1307 static int 1308 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1309 { 1310 struct ifbareq *req = arg; 1311 struct bridge_iflist *bif; 1312 int error; 1313 1314 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1315 if (bif == NULL) 1316 return (ENOENT); 1317 1318 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1319 req->ifba_flags); 1320 1321 return (error); 1322 } 1323 1324 static int 1325 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1326 { 1327 struct ifbrparam *param = arg; 1328 1329 sc->sc_brttimeout = param->ifbrp_ctime; 1330 return (0); 1331 } 1332 1333 static int 1334 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1335 { 1336 struct ifbrparam *param = arg; 1337 1338 param->ifbrp_ctime = sc->sc_brttimeout; 1339 return (0); 1340 } 1341 1342 static int 1343 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1344 { 1345 struct ifbareq *req = arg; 1346 1347 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1348 } 1349 1350 static int 1351 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1352 { 1353 struct ifbreq *req = arg; 1354 1355 bridge_rtflush(sc, req->ifbr_ifsflags); 1356 return (0); 1357 } 1358 1359 static int 1360 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1361 { 1362 struct ifbrparam *param = arg; 1363 struct bstp_state *bs = &sc->sc_stp; 1364 1365 param->ifbrp_prio = bs->bs_bridge_priority; 1366 return (0); 1367 } 1368 1369 static int 1370 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1371 { 1372 struct ifbrparam *param = arg; 1373 1374 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1375 } 1376 1377 static int 1378 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1379 { 1380 struct ifbrparam *param = arg; 1381 struct bstp_state *bs = &sc->sc_stp; 1382 1383 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1384 return (0); 1385 } 1386 1387 static int 1388 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1389 { 1390 struct ifbrparam *param = arg; 1391 1392 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1393 } 1394 1395 static int 1396 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1397 { 1398 struct ifbrparam *param = arg; 1399 struct bstp_state *bs = &sc->sc_stp; 1400 1401 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1402 return (0); 1403 } 1404 1405 static int 1406 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1407 { 1408 struct ifbrparam *param = arg; 1409 1410 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1411 } 1412 1413 static int 1414 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1415 { 1416 struct ifbrparam *param = arg; 1417 struct bstp_state *bs = &sc->sc_stp; 1418 1419 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1420 return (0); 1421 } 1422 1423 static int 1424 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1425 { 1426 struct ifbrparam *param = arg; 1427 1428 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1429 } 1430 1431 static int 1432 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1433 { 1434 struct ifbreq *req = arg; 1435 struct bridge_iflist *bif; 1436 1437 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1438 if (bif == NULL) 1439 return (ENOENT); 1440 1441 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1442 } 1443 1444 static int 1445 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1446 { 1447 struct ifbreq *req = arg; 1448 struct bridge_iflist *bif; 1449 1450 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1451 if (bif == NULL) 1452 return (ENOENT); 1453 1454 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1455 } 1456 1457 static int 1458 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1459 { 1460 struct ifbreq *req = arg; 1461 struct bridge_iflist *bif; 1462 1463 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1464 if (bif == NULL) 1465 return (ENOENT); 1466 1467 bif->bif_addrmax = req->ifbr_addrmax; 1468 return (0); 1469 } 1470 1471 static int 1472 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1473 { 1474 struct ifbreq *req = arg; 1475 struct bridge_iflist *bif = NULL; 1476 struct ifnet *ifs; 1477 1478 ifs = ifunit(req->ifbr_ifsname); 1479 if (ifs == NULL) 1480 return (ENOENT); 1481 1482 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1483 if (ifs == bif->bif_ifp) 1484 return (EBUSY); 1485 1486 if (ifs->if_bridge != NULL) 1487 return (EBUSY); 1488 1489 switch (ifs->if_type) { 1490 case IFT_ETHER: 1491 case IFT_GIF: 1492 case IFT_L2VLAN: 1493 break; 1494 default: 1495 return (EINVAL); 1496 } 1497 1498 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1499 if (bif == NULL) 1500 return (ENOMEM); 1501 1502 bif->bif_ifp = ifs; 1503 bif->bif_flags = IFBIF_SPAN; 1504 1505 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1506 1507 return (0); 1508 } 1509 1510 static int 1511 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1512 { 1513 struct ifbreq *req = arg; 1514 struct bridge_iflist *bif; 1515 struct ifnet *ifs; 1516 1517 ifs = ifunit(req->ifbr_ifsname); 1518 if (ifs == NULL) 1519 return (ENOENT); 1520 1521 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1522 if (ifs == bif->bif_ifp) 1523 break; 1524 1525 if (bif == NULL) 1526 return (ENOENT); 1527 1528 bridge_delete_span(sc, bif); 1529 1530 return (0); 1531 } 1532 1533 static int 1534 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1535 { 1536 struct ifbropreq *req = arg; 1537 struct bstp_state *bs = &sc->sc_stp; 1538 struct bstp_port *root_port; 1539 1540 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1541 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1542 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1543 1544 root_port = bs->bs_root_port; 1545 if (root_port == NULL) 1546 req->ifbop_root_port = 0; 1547 else 1548 req->ifbop_root_port = root_port->bp_ifp->if_index; 1549 1550 req->ifbop_holdcount = bs->bs_txholdcount; 1551 req->ifbop_priority = bs->bs_bridge_priority; 1552 req->ifbop_protocol = bs->bs_protover; 1553 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1554 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1555 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1556 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1557 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1558 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1559 1560 return (0); 1561 } 1562 1563 static int 1564 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1565 { 1566 struct ifbrparam *param = arg; 1567 1568 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1569 return (0); 1570 } 1571 1572 static int 1573 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1574 { 1575 struct ifbpstpconf *bifstp = arg; 1576 struct bridge_iflist *bif; 1577 struct bstp_port *bp; 1578 struct ifbpstpreq bpreq; 1579 char *buf, *outbuf; 1580 int count, buflen, len, error = 0; 1581 1582 count = 0; 1583 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1584 if ((bif->bif_flags & IFBIF_STP) != 0) 1585 count++; 1586 } 1587 1588 buflen = sizeof(bpreq) * count; 1589 if (bifstp->ifbpstp_len == 0) { 1590 bifstp->ifbpstp_len = buflen; 1591 return (0); 1592 } 1593 1594 BRIDGE_UNLOCK(sc); 1595 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1596 BRIDGE_LOCK(sc); 1597 1598 count = 0; 1599 buf = outbuf; 1600 len = min(bifstp->ifbpstp_len, buflen); 1601 bzero(&bpreq, sizeof(bpreq)); 1602 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1603 if (len < sizeof(bpreq)) 1604 break; 1605 1606 if ((bif->bif_flags & IFBIF_STP) == 0) 1607 continue; 1608 1609 bp = &bif->bif_stp; 1610 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1611 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1612 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1613 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1614 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1615 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1616 1617 memcpy(buf, &bpreq, sizeof(bpreq)); 1618 count++; 1619 buf += sizeof(bpreq); 1620 len -= sizeof(bpreq); 1621 } 1622 1623 BRIDGE_UNLOCK(sc); 1624 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1625 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1626 BRIDGE_LOCK(sc); 1627 free(outbuf, M_TEMP); 1628 return (error); 1629 } 1630 1631 static int 1632 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1633 { 1634 struct ifbrparam *param = arg; 1635 1636 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1637 } 1638 1639 static int 1640 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1641 { 1642 struct ifbrparam *param = arg; 1643 1644 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1645 } 1646 1647 /* 1648 * bridge_ifdetach: 1649 * 1650 * Detach an interface from a bridge. Called when a member 1651 * interface is detaching. 1652 */ 1653 static void 1654 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1655 { 1656 struct bridge_softc *sc = ifp->if_bridge; 1657 struct bridge_iflist *bif; 1658 1659 /* Check if the interface is a bridge member */ 1660 if (sc != NULL) { 1661 BRIDGE_LOCK(sc); 1662 1663 bif = bridge_lookup_member_if(sc, ifp); 1664 if (bif != NULL) 1665 bridge_delete_member(sc, bif, 1); 1666 1667 BRIDGE_UNLOCK(sc); 1668 return; 1669 } 1670 1671 /* Check if the interface is a span port */ 1672 mtx_lock(&bridge_list_mtx); 1673 LIST_FOREACH(sc, &bridge_list, sc_list) { 1674 BRIDGE_LOCK(sc); 1675 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1676 if (ifp == bif->bif_ifp) { 1677 bridge_delete_span(sc, bif); 1678 break; 1679 } 1680 1681 BRIDGE_UNLOCK(sc); 1682 } 1683 mtx_unlock(&bridge_list_mtx); 1684 } 1685 1686 /* 1687 * bridge_init: 1688 * 1689 * Initialize a bridge interface. 1690 */ 1691 static void 1692 bridge_init(void *xsc) 1693 { 1694 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1695 struct ifnet *ifp = sc->sc_ifp; 1696 1697 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1698 return; 1699 1700 BRIDGE_LOCK(sc); 1701 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1702 bridge_timer, sc); 1703 1704 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1705 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1706 1707 BRIDGE_UNLOCK(sc); 1708 } 1709 1710 /* 1711 * bridge_stop: 1712 * 1713 * Stop the bridge interface. 1714 */ 1715 static void 1716 bridge_stop(struct ifnet *ifp, int disable) 1717 { 1718 struct bridge_softc *sc = ifp->if_softc; 1719 1720 BRIDGE_LOCK_ASSERT(sc); 1721 1722 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1723 return; 1724 1725 callout_stop(&sc->sc_brcallout); 1726 bstp_stop(&sc->sc_stp); 1727 1728 bridge_rtflush(sc, IFBF_FLUSHDYN); 1729 1730 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1731 } 1732 1733 /* 1734 * bridge_enqueue: 1735 * 1736 * Enqueue a packet on a bridge member interface. 1737 * 1738 */ 1739 static void 1740 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1741 { 1742 int len, err = 0; 1743 short mflags; 1744 struct mbuf *m0; 1745 1746 len = m->m_pkthdr.len; 1747 mflags = m->m_flags; 1748 1749 /* We may be sending a fragment so traverse the mbuf */ 1750 for (; m; m = m0) { 1751 m0 = m->m_nextpkt; 1752 m->m_nextpkt = NULL; 1753 1754 /* 1755 * If underlying interface can not do VLAN tag insertion itself 1756 * then attach a packet tag that holds it. 1757 */ 1758 if ((m->m_flags & M_VLANTAG) && 1759 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1760 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1761 if (m == NULL) { 1762 if_printf(dst_ifp, 1763 "unable to prepend VLAN header\n"); 1764 dst_ifp->if_oerrors++; 1765 continue; 1766 } 1767 m->m_flags &= ~M_VLANTAG; 1768 } 1769 1770 if (err == 0) 1771 dst_ifp->if_transmit(dst_ifp, m); 1772 } 1773 1774 if (err == 0) { 1775 sc->sc_ifp->if_opackets++; 1776 sc->sc_ifp->if_obytes += len; 1777 if (mflags & M_MCAST) 1778 sc->sc_ifp->if_omcasts++; 1779 } 1780 } 1781 1782 /* 1783 * bridge_dummynet: 1784 * 1785 * Receive a queued packet from dummynet and pass it on to the output 1786 * interface. 1787 * 1788 * The mbuf has the Ethernet header already attached. 1789 */ 1790 static void 1791 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1792 { 1793 struct bridge_softc *sc; 1794 1795 sc = ifp->if_bridge; 1796 1797 /* 1798 * The packet didnt originate from a member interface. This should only 1799 * ever happen if a member interface is removed while packets are 1800 * queued for it. 1801 */ 1802 if (sc == NULL) { 1803 m_freem(m); 1804 return; 1805 } 1806 1807 if (PFIL_HOOKED(&inet_pfil_hook) 1808 #ifdef INET6 1809 || PFIL_HOOKED(&inet6_pfil_hook) 1810 #endif 1811 ) { 1812 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1813 return; 1814 if (m == NULL) 1815 return; 1816 } 1817 1818 bridge_enqueue(sc, ifp, m); 1819 } 1820 1821 /* 1822 * bridge_output: 1823 * 1824 * Send output from a bridge member interface. This 1825 * performs the bridging function for locally originated 1826 * packets. 1827 * 1828 * The mbuf has the Ethernet header already attached. We must 1829 * enqueue or free the mbuf before returning. 1830 */ 1831 static int 1832 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1833 struct rtentry *rt) 1834 { 1835 struct ether_header *eh; 1836 struct ifnet *dst_if; 1837 struct bridge_softc *sc; 1838 uint16_t vlan; 1839 1840 if (m->m_len < ETHER_HDR_LEN) { 1841 m = m_pullup(m, ETHER_HDR_LEN); 1842 if (m == NULL) 1843 return (0); 1844 } 1845 1846 eh = mtod(m, struct ether_header *); 1847 sc = ifp->if_bridge; 1848 vlan = VLANTAGOF(m); 1849 1850 BRIDGE_LOCK(sc); 1851 1852 /* 1853 * If bridge is down, but the original output interface is up, 1854 * go ahead and send out that interface. Otherwise, the packet 1855 * is dropped below. 1856 */ 1857 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1858 dst_if = ifp; 1859 goto sendunicast; 1860 } 1861 1862 /* 1863 * If the packet is a multicast, or we don't know a better way to 1864 * get there, send to all interfaces. 1865 */ 1866 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1867 dst_if = NULL; 1868 else 1869 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1870 if (dst_if == NULL) { 1871 struct bridge_iflist *bif; 1872 struct mbuf *mc; 1873 int error = 0, used = 0; 1874 1875 bridge_span(sc, m); 1876 1877 BRIDGE_LOCK2REF(sc, error); 1878 if (error) { 1879 m_freem(m); 1880 return (0); 1881 } 1882 1883 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1884 dst_if = bif->bif_ifp; 1885 1886 if (dst_if->if_type == IFT_GIF) 1887 continue; 1888 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1889 continue; 1890 1891 /* 1892 * If this is not the original output interface, 1893 * and the interface is participating in spanning 1894 * tree, make sure the port is in a state that 1895 * allows forwarding. 1896 */ 1897 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1898 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1899 continue; 1900 1901 if (LIST_NEXT(bif, bif_next) == NULL) { 1902 used = 1; 1903 mc = m; 1904 } else { 1905 mc = m_copypacket(m, M_DONTWAIT); 1906 if (mc == NULL) { 1907 sc->sc_ifp->if_oerrors++; 1908 continue; 1909 } 1910 } 1911 1912 bridge_enqueue(sc, dst_if, mc); 1913 } 1914 if (used == 0) 1915 m_freem(m); 1916 BRIDGE_UNREF(sc); 1917 return (0); 1918 } 1919 1920 sendunicast: 1921 /* 1922 * XXX Spanning tree consideration here? 1923 */ 1924 1925 bridge_span(sc, m); 1926 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1927 m_freem(m); 1928 BRIDGE_UNLOCK(sc); 1929 return (0); 1930 } 1931 1932 BRIDGE_UNLOCK(sc); 1933 bridge_enqueue(sc, dst_if, m); 1934 return (0); 1935 } 1936 1937 /* 1938 * bridge_start: 1939 * 1940 * Start output on a bridge. 1941 * 1942 */ 1943 static void 1944 bridge_start(struct ifnet *ifp) 1945 { 1946 struct bridge_softc *sc; 1947 struct mbuf *m; 1948 struct ether_header *eh; 1949 struct ifnet *dst_if; 1950 1951 sc = ifp->if_softc; 1952 1953 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1954 for (;;) { 1955 IFQ_DEQUEUE(&ifp->if_snd, m); 1956 if (m == 0) 1957 break; 1958 ETHER_BPF_MTAP(ifp, m); 1959 1960 eh = mtod(m, struct ether_header *); 1961 dst_if = NULL; 1962 1963 BRIDGE_LOCK(sc); 1964 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1965 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1966 } 1967 1968 if (dst_if == NULL) 1969 bridge_broadcast(sc, ifp, m, 0); 1970 else { 1971 BRIDGE_UNLOCK(sc); 1972 bridge_enqueue(sc, dst_if, m); 1973 } 1974 } 1975 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1976 } 1977 1978 /* 1979 * bridge_forward: 1980 * 1981 * The forwarding function of the bridge. 1982 * 1983 * NOTE: Releases the lock on return. 1984 */ 1985 static void 1986 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1987 struct mbuf *m) 1988 { 1989 struct bridge_iflist *dbif; 1990 struct ifnet *src_if, *dst_if, *ifp; 1991 struct ether_header *eh; 1992 uint16_t vlan; 1993 uint8_t *dst; 1994 int error; 1995 1996 src_if = m->m_pkthdr.rcvif; 1997 ifp = sc->sc_ifp; 1998 1999 ifp->if_ipackets++; 2000 ifp->if_ibytes += m->m_pkthdr.len; 2001 vlan = VLANTAGOF(m); 2002 2003 if ((sbif->bif_flags & IFBIF_STP) && 2004 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2005 goto drop; 2006 2007 eh = mtod(m, struct ether_header *); 2008 dst = eh->ether_dhost; 2009 2010 /* If the interface is learning, record the address. */ 2011 if (sbif->bif_flags & IFBIF_LEARNING) { 2012 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2013 sbif, 0, IFBAF_DYNAMIC); 2014 /* 2015 * If the interface has addresses limits then deny any source 2016 * that is not in the cache. 2017 */ 2018 if (error && sbif->bif_addrmax) 2019 goto drop; 2020 } 2021 2022 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2023 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2024 goto drop; 2025 2026 /* 2027 * At this point, the port either doesn't participate 2028 * in spanning tree or it is in the forwarding state. 2029 */ 2030 2031 /* 2032 * If the packet is unicast, destined for someone on 2033 * "this" side of the bridge, drop it. 2034 */ 2035 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2036 dst_if = bridge_rtlookup(sc, dst, vlan); 2037 if (src_if == dst_if) 2038 goto drop; 2039 } else { 2040 /* 2041 * Check if its a reserved multicast address, any address 2042 * listed in 802.1D section 7.12.6 may not be forwarded by the 2043 * bridge. 2044 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2045 */ 2046 if (dst[0] == 0x01 && dst[1] == 0x80 && 2047 dst[2] == 0xc2 && dst[3] == 0x00 && 2048 dst[4] == 0x00 && dst[5] <= 0x0f) 2049 goto drop; 2050 2051 /* ...forward it to all interfaces. */ 2052 ifp->if_imcasts++; 2053 dst_if = NULL; 2054 } 2055 2056 /* 2057 * If we have a destination interface which is a member of our bridge, 2058 * OR this is a unicast packet, push it through the bpf(4) machinery. 2059 * For broadcast or multicast packets, don't bother because it will 2060 * be reinjected into ether_input. We do this before we pass the packets 2061 * through the pfil(9) framework, as it is possible that pfil(9) will 2062 * drop the packet, or possibly modify it, making it difficult to debug 2063 * firewall issues on the bridge. 2064 */ 2065 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2066 ETHER_BPF_MTAP(ifp, m); 2067 2068 /* run the packet filter */ 2069 if (PFIL_HOOKED(&inet_pfil_hook) 2070 #ifdef INET6 2071 || PFIL_HOOKED(&inet6_pfil_hook) 2072 #endif 2073 ) { 2074 BRIDGE_UNLOCK(sc); 2075 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2076 return; 2077 if (m == NULL) 2078 return; 2079 BRIDGE_LOCK(sc); 2080 } 2081 2082 if (dst_if == NULL) { 2083 bridge_broadcast(sc, src_if, m, 1); 2084 return; 2085 } 2086 2087 /* 2088 * At this point, we're dealing with a unicast frame 2089 * going to a different interface. 2090 */ 2091 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2092 goto drop; 2093 2094 dbif = bridge_lookup_member_if(sc, dst_if); 2095 if (dbif == NULL) 2096 /* Not a member of the bridge (anymore?) */ 2097 goto drop; 2098 2099 /* Private segments can not talk to each other */ 2100 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2101 goto drop; 2102 2103 if ((dbif->bif_flags & IFBIF_STP) && 2104 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2105 goto drop; 2106 2107 BRIDGE_UNLOCK(sc); 2108 2109 if (PFIL_HOOKED(&inet_pfil_hook) 2110 #ifdef INET6 2111 || PFIL_HOOKED(&inet6_pfil_hook) 2112 #endif 2113 ) { 2114 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2115 return; 2116 if (m == NULL) 2117 return; 2118 } 2119 2120 bridge_enqueue(sc, dst_if, m); 2121 return; 2122 2123 drop: 2124 BRIDGE_UNLOCK(sc); 2125 m_freem(m); 2126 } 2127 2128 /* 2129 * bridge_input: 2130 * 2131 * Receive input from a member interface. Queue the packet for 2132 * bridging if it is not for us. 2133 */ 2134 static struct mbuf * 2135 bridge_input(struct ifnet *ifp, struct mbuf *m) 2136 { 2137 struct bridge_softc *sc = ifp->if_bridge; 2138 struct bridge_iflist *bif, *bif2; 2139 struct ifnet *bifp; 2140 struct ether_header *eh; 2141 struct mbuf *mc, *mc2; 2142 uint16_t vlan; 2143 int error; 2144 2145 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2146 return (m); 2147 2148 bifp = sc->sc_ifp; 2149 vlan = VLANTAGOF(m); 2150 2151 /* 2152 * Implement support for bridge monitoring. If this flag has been 2153 * set on this interface, discard the packet once we push it through 2154 * the bpf(4) machinery, but before we do, increment the byte and 2155 * packet counters associated with this interface. 2156 */ 2157 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2158 m->m_pkthdr.rcvif = bifp; 2159 ETHER_BPF_MTAP(bifp, m); 2160 bifp->if_ipackets++; 2161 bifp->if_ibytes += m->m_pkthdr.len; 2162 m_freem(m); 2163 return (NULL); 2164 } 2165 BRIDGE_LOCK(sc); 2166 bif = bridge_lookup_member_if(sc, ifp); 2167 if (bif == NULL) { 2168 BRIDGE_UNLOCK(sc); 2169 return (m); 2170 } 2171 2172 eh = mtod(m, struct ether_header *); 2173 2174 bridge_span(sc, m); 2175 2176 if (m->m_flags & (M_BCAST|M_MCAST)) { 2177 /* Tap off 802.1D packets; they do not get forwarded. */ 2178 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2179 ETHER_ADDR_LEN) == 0) { 2180 m = bstp_input(&bif->bif_stp, ifp, m); 2181 if (m == NULL) { 2182 BRIDGE_UNLOCK(sc); 2183 return (NULL); 2184 } 2185 } 2186 2187 if ((bif->bif_flags & IFBIF_STP) && 2188 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2189 BRIDGE_UNLOCK(sc); 2190 return (m); 2191 } 2192 2193 /* 2194 * Make a deep copy of the packet and enqueue the copy 2195 * for bridge processing; return the original packet for 2196 * local processing. 2197 */ 2198 mc = m_dup(m, M_DONTWAIT); 2199 if (mc == NULL) { 2200 BRIDGE_UNLOCK(sc); 2201 return (m); 2202 } 2203 2204 /* Perform the bridge forwarding function with the copy. */ 2205 bridge_forward(sc, bif, mc); 2206 2207 /* 2208 * Reinject the mbuf as arriving on the bridge so we have a 2209 * chance at claiming multicast packets. We can not loop back 2210 * here from ether_input as a bridge is never a member of a 2211 * bridge. 2212 */ 2213 KASSERT(bifp->if_bridge == NULL, 2214 ("loop created in bridge_input")); 2215 mc2 = m_dup(m, M_DONTWAIT); 2216 if (mc2 != NULL) { 2217 /* Keep the layer3 header aligned */ 2218 int i = min(mc2->m_pkthdr.len, max_protohdr); 2219 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2220 } 2221 if (mc2 != NULL) { 2222 mc2->m_pkthdr.rcvif = bifp; 2223 (*bifp->if_input)(bifp, mc2); 2224 } 2225 2226 /* Return the original packet for local processing. */ 2227 return (m); 2228 } 2229 2230 if ((bif->bif_flags & IFBIF_STP) && 2231 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2232 BRIDGE_UNLOCK(sc); 2233 return (m); 2234 } 2235 2236 #if (defined(INET) || defined(INET6)) && defined(DEV_CARP) 2237 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2238 || ((iface)->if_carp \ 2239 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2240 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2241 || ((iface)->if_carp \ 2242 && carp_forus((iface)->if_carp, eh->ether_shost)) 2243 #else 2244 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2245 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2246 #endif 2247 2248 #ifdef INET6 2249 # define OR_PFIL_HOOKED_INET6 \ 2250 || PFIL_HOOKED(&inet6_pfil_hook) 2251 #else 2252 # define OR_PFIL_HOOKED_INET6 2253 #endif 2254 2255 #define GRAB_OUR_PACKETS(iface) \ 2256 if ((iface)->if_type == IFT_GIF) \ 2257 continue; \ 2258 /* It is destined for us. */ \ 2259 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2260 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2261 ) { \ 2262 if ((iface)->if_type == IFT_BRIDGE) { \ 2263 ETHER_BPF_MTAP(iface, m); \ 2264 iface->if_ipackets++; \ 2265 /* Filter on the physical interface. */ \ 2266 if (pfil_local_phys && \ 2267 (PFIL_HOOKED(&inet_pfil_hook) \ 2268 OR_PFIL_HOOKED_INET6)) { \ 2269 if (bridge_pfil(&m, NULL, ifp, \ 2270 PFIL_IN) != 0 || m == NULL) { \ 2271 BRIDGE_UNLOCK(sc); \ 2272 return (NULL); \ 2273 } \ 2274 } \ 2275 } \ 2276 if (bif->bif_flags & IFBIF_LEARNING) { \ 2277 error = bridge_rtupdate(sc, eh->ether_shost, \ 2278 vlan, bif, 0, IFBAF_DYNAMIC); \ 2279 if (error && bif->bif_addrmax) { \ 2280 BRIDGE_UNLOCK(sc); \ 2281 m_freem(m); \ 2282 return (NULL); \ 2283 } \ 2284 } \ 2285 m->m_pkthdr.rcvif = iface; \ 2286 BRIDGE_UNLOCK(sc); \ 2287 return (m); \ 2288 } \ 2289 \ 2290 /* We just received a packet that we sent out. */ \ 2291 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2292 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2293 ) { \ 2294 BRIDGE_UNLOCK(sc); \ 2295 m_freem(m); \ 2296 return (NULL); \ 2297 } 2298 2299 /* 2300 * Unicast. Make sure it's not for the bridge. 2301 */ 2302 do { GRAB_OUR_PACKETS(bifp) } while (0); 2303 2304 /* 2305 * Give a chance for ifp at first priority. This will help when the 2306 * packet comes through the interface like VLAN's with the same MACs 2307 * on several interfaces from the same bridge. This also will save 2308 * some CPU cycles in case the destination interface and the input 2309 * interface (eq ifp) are the same. 2310 */ 2311 do { GRAB_OUR_PACKETS(ifp) } while (0); 2312 2313 /* Now check the all bridge members. */ 2314 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2315 GRAB_OUR_PACKETS(bif2->bif_ifp) 2316 } 2317 2318 #undef OR_CARP_CHECK_WE_ARE_DST 2319 #undef OR_CARP_CHECK_WE_ARE_SRC 2320 #undef OR_PFIL_HOOKED_INET6 2321 #undef GRAB_OUR_PACKETS 2322 2323 /* Perform the bridge forwarding function. */ 2324 bridge_forward(sc, bif, m); 2325 2326 return (NULL); 2327 } 2328 2329 /* 2330 * bridge_broadcast: 2331 * 2332 * Send a frame to all interfaces that are members of 2333 * the bridge, except for the one on which the packet 2334 * arrived. 2335 * 2336 * NOTE: Releases the lock on return. 2337 */ 2338 static void 2339 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2340 struct mbuf *m, int runfilt) 2341 { 2342 struct bridge_iflist *dbif, *sbif; 2343 struct mbuf *mc; 2344 struct ifnet *dst_if; 2345 int error = 0, used = 0, i; 2346 2347 sbif = bridge_lookup_member_if(sc, src_if); 2348 2349 BRIDGE_LOCK2REF(sc, error); 2350 if (error) { 2351 m_freem(m); 2352 return; 2353 } 2354 2355 /* Filter on the bridge interface before broadcasting */ 2356 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2357 #ifdef INET6 2358 || PFIL_HOOKED(&inet6_pfil_hook) 2359 #endif 2360 )) { 2361 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2362 goto out; 2363 if (m == NULL) 2364 goto out; 2365 } 2366 2367 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2368 dst_if = dbif->bif_ifp; 2369 if (dst_if == src_if) 2370 continue; 2371 2372 /* Private segments can not talk to each other */ 2373 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2374 continue; 2375 2376 if ((dbif->bif_flags & IFBIF_STP) && 2377 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2378 continue; 2379 2380 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2381 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2382 continue; 2383 2384 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2385 continue; 2386 2387 if (LIST_NEXT(dbif, bif_next) == NULL) { 2388 mc = m; 2389 used = 1; 2390 } else { 2391 mc = m_dup(m, M_DONTWAIT); 2392 if (mc == NULL) { 2393 sc->sc_ifp->if_oerrors++; 2394 continue; 2395 } 2396 } 2397 2398 /* 2399 * Filter on the output interface. Pass a NULL bridge interface 2400 * pointer so we do not redundantly filter on the bridge for 2401 * each interface we broadcast on. 2402 */ 2403 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2404 #ifdef INET6 2405 || PFIL_HOOKED(&inet6_pfil_hook) 2406 #endif 2407 )) { 2408 if (used == 0) { 2409 /* Keep the layer3 header aligned */ 2410 i = min(mc->m_pkthdr.len, max_protohdr); 2411 mc = m_copyup(mc, i, ETHER_ALIGN); 2412 if (mc == NULL) { 2413 sc->sc_ifp->if_oerrors++; 2414 continue; 2415 } 2416 } 2417 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2418 continue; 2419 if (mc == NULL) 2420 continue; 2421 } 2422 2423 bridge_enqueue(sc, dst_if, mc); 2424 } 2425 if (used == 0) 2426 m_freem(m); 2427 2428 out: 2429 BRIDGE_UNREF(sc); 2430 } 2431 2432 /* 2433 * bridge_span: 2434 * 2435 * Duplicate a packet out one or more interfaces that are in span mode, 2436 * the original mbuf is unmodified. 2437 */ 2438 static void 2439 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2440 { 2441 struct bridge_iflist *bif; 2442 struct ifnet *dst_if; 2443 struct mbuf *mc; 2444 2445 if (LIST_EMPTY(&sc->sc_spanlist)) 2446 return; 2447 2448 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2449 dst_if = bif->bif_ifp; 2450 2451 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2452 continue; 2453 2454 mc = m_copypacket(m, M_DONTWAIT); 2455 if (mc == NULL) { 2456 sc->sc_ifp->if_oerrors++; 2457 continue; 2458 } 2459 2460 bridge_enqueue(sc, dst_if, mc); 2461 } 2462 } 2463 2464 /* 2465 * bridge_rtupdate: 2466 * 2467 * Add a bridge routing entry. 2468 */ 2469 static int 2470 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2471 struct bridge_iflist *bif, int setflags, uint8_t flags) 2472 { 2473 struct bridge_rtnode *brt; 2474 int error; 2475 2476 BRIDGE_LOCK_ASSERT(sc); 2477 2478 /* Check the source address is valid and not multicast. */ 2479 if (ETHER_IS_MULTICAST(dst) || 2480 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2481 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2482 return (EINVAL); 2483 2484 /* 802.1p frames map to vlan 1 */ 2485 if (vlan == 0) 2486 vlan = 1; 2487 2488 /* 2489 * A route for this destination might already exist. If so, 2490 * update it, otherwise create a new one. 2491 */ 2492 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2493 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2494 sc->sc_brtexceeded++; 2495 return (ENOSPC); 2496 } 2497 /* Check per interface address limits (if enabled) */ 2498 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2499 bif->bif_addrexceeded++; 2500 return (ENOSPC); 2501 } 2502 2503 /* 2504 * Allocate a new bridge forwarding node, and 2505 * initialize the expiration time and Ethernet 2506 * address. 2507 */ 2508 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2509 if (brt == NULL) 2510 return (ENOMEM); 2511 2512 if (bif->bif_flags & IFBIF_STICKY) 2513 brt->brt_flags = IFBAF_STICKY; 2514 else 2515 brt->brt_flags = IFBAF_DYNAMIC; 2516 2517 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2518 brt->brt_vlan = vlan; 2519 2520 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2521 uma_zfree(bridge_rtnode_zone, brt); 2522 return (error); 2523 } 2524 brt->brt_dst = bif; 2525 bif->bif_addrcnt++; 2526 } 2527 2528 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2529 brt->brt_dst != bif) { 2530 brt->brt_dst->bif_addrcnt--; 2531 brt->brt_dst = bif; 2532 brt->brt_dst->bif_addrcnt++; 2533 } 2534 2535 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2536 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2537 if (setflags) 2538 brt->brt_flags = flags; 2539 2540 return (0); 2541 } 2542 2543 /* 2544 * bridge_rtlookup: 2545 * 2546 * Lookup the destination interface for an address. 2547 */ 2548 static struct ifnet * 2549 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2550 { 2551 struct bridge_rtnode *brt; 2552 2553 BRIDGE_LOCK_ASSERT(sc); 2554 2555 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2556 return (NULL); 2557 2558 return (brt->brt_ifp); 2559 } 2560 2561 /* 2562 * bridge_rttrim: 2563 * 2564 * Trim the routine table so that we have a number 2565 * of routing entries less than or equal to the 2566 * maximum number. 2567 */ 2568 static void 2569 bridge_rttrim(struct bridge_softc *sc) 2570 { 2571 struct bridge_rtnode *brt, *nbrt; 2572 2573 BRIDGE_LOCK_ASSERT(sc); 2574 2575 /* Make sure we actually need to do this. */ 2576 if (sc->sc_brtcnt <= sc->sc_brtmax) 2577 return; 2578 2579 /* Force an aging cycle; this might trim enough addresses. */ 2580 bridge_rtage(sc); 2581 if (sc->sc_brtcnt <= sc->sc_brtmax) 2582 return; 2583 2584 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2585 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2586 bridge_rtnode_destroy(sc, brt); 2587 if (sc->sc_brtcnt <= sc->sc_brtmax) 2588 return; 2589 } 2590 } 2591 } 2592 2593 /* 2594 * bridge_timer: 2595 * 2596 * Aging timer for the bridge. 2597 */ 2598 static void 2599 bridge_timer(void *arg) 2600 { 2601 struct bridge_softc *sc = arg; 2602 2603 BRIDGE_LOCK_ASSERT(sc); 2604 2605 bridge_rtage(sc); 2606 2607 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2608 callout_reset(&sc->sc_brcallout, 2609 bridge_rtable_prune_period * hz, bridge_timer, sc); 2610 } 2611 2612 /* 2613 * bridge_rtage: 2614 * 2615 * Perform an aging cycle. 2616 */ 2617 static void 2618 bridge_rtage(struct bridge_softc *sc) 2619 { 2620 struct bridge_rtnode *brt, *nbrt; 2621 2622 BRIDGE_LOCK_ASSERT(sc); 2623 2624 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2625 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2626 if (time_uptime >= brt->brt_expire) 2627 bridge_rtnode_destroy(sc, brt); 2628 } 2629 } 2630 } 2631 2632 /* 2633 * bridge_rtflush: 2634 * 2635 * Remove all dynamic addresses from the bridge. 2636 */ 2637 static void 2638 bridge_rtflush(struct bridge_softc *sc, int full) 2639 { 2640 struct bridge_rtnode *brt, *nbrt; 2641 2642 BRIDGE_LOCK_ASSERT(sc); 2643 2644 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2645 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2646 bridge_rtnode_destroy(sc, brt); 2647 } 2648 } 2649 2650 /* 2651 * bridge_rtdaddr: 2652 * 2653 * Remove an address from the table. 2654 */ 2655 static int 2656 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2657 { 2658 struct bridge_rtnode *brt; 2659 int found = 0; 2660 2661 BRIDGE_LOCK_ASSERT(sc); 2662 2663 /* 2664 * If vlan is zero then we want to delete for all vlans so the lookup 2665 * may return more than one. 2666 */ 2667 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2668 bridge_rtnode_destroy(sc, brt); 2669 found = 1; 2670 } 2671 2672 return (found ? 0 : ENOENT); 2673 } 2674 2675 /* 2676 * bridge_rtdelete: 2677 * 2678 * Delete routes to a speicifc member interface. 2679 */ 2680 static void 2681 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2682 { 2683 struct bridge_rtnode *brt, *nbrt; 2684 2685 BRIDGE_LOCK_ASSERT(sc); 2686 2687 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2688 if (brt->brt_ifp == ifp && (full || 2689 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2690 bridge_rtnode_destroy(sc, brt); 2691 } 2692 } 2693 2694 /* 2695 * bridge_rtable_init: 2696 * 2697 * Initialize the route table for this bridge. 2698 */ 2699 static int 2700 bridge_rtable_init(struct bridge_softc *sc) 2701 { 2702 int i; 2703 2704 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2705 M_DEVBUF, M_NOWAIT); 2706 if (sc->sc_rthash == NULL) 2707 return (ENOMEM); 2708 2709 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2710 LIST_INIT(&sc->sc_rthash[i]); 2711 2712 sc->sc_rthash_key = arc4random(); 2713 2714 LIST_INIT(&sc->sc_rtlist); 2715 2716 return (0); 2717 } 2718 2719 /* 2720 * bridge_rtable_fini: 2721 * 2722 * Deconstruct the route table for this bridge. 2723 */ 2724 static void 2725 bridge_rtable_fini(struct bridge_softc *sc) 2726 { 2727 2728 KASSERT(sc->sc_brtcnt == 0, 2729 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2730 free(sc->sc_rthash, M_DEVBUF); 2731 } 2732 2733 /* 2734 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2735 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2736 */ 2737 #define mix(a, b, c) \ 2738 do { \ 2739 a -= b; a -= c; a ^= (c >> 13); \ 2740 b -= c; b -= a; b ^= (a << 8); \ 2741 c -= a; c -= b; c ^= (b >> 13); \ 2742 a -= b; a -= c; a ^= (c >> 12); \ 2743 b -= c; b -= a; b ^= (a << 16); \ 2744 c -= a; c -= b; c ^= (b >> 5); \ 2745 a -= b; a -= c; a ^= (c >> 3); \ 2746 b -= c; b -= a; b ^= (a << 10); \ 2747 c -= a; c -= b; c ^= (b >> 15); \ 2748 } while (/*CONSTCOND*/0) 2749 2750 static __inline uint32_t 2751 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2752 { 2753 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2754 2755 b += addr[5] << 8; 2756 b += addr[4]; 2757 a += addr[3] << 24; 2758 a += addr[2] << 16; 2759 a += addr[1] << 8; 2760 a += addr[0]; 2761 2762 mix(a, b, c); 2763 2764 return (c & BRIDGE_RTHASH_MASK); 2765 } 2766 2767 #undef mix 2768 2769 static int 2770 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2771 { 2772 int i, d; 2773 2774 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2775 d = ((int)a[i]) - ((int)b[i]); 2776 } 2777 2778 return (d); 2779 } 2780 2781 /* 2782 * bridge_rtnode_lookup: 2783 * 2784 * Look up a bridge route node for the specified destination. Compare the 2785 * vlan id or if zero then just return the first match. 2786 */ 2787 static struct bridge_rtnode * 2788 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2789 { 2790 struct bridge_rtnode *brt; 2791 uint32_t hash; 2792 int dir; 2793 2794 BRIDGE_LOCK_ASSERT(sc); 2795 2796 hash = bridge_rthash(sc, addr); 2797 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2798 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2799 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2800 return (brt); 2801 if (dir > 0) 2802 return (NULL); 2803 } 2804 2805 return (NULL); 2806 } 2807 2808 /* 2809 * bridge_rtnode_insert: 2810 * 2811 * Insert the specified bridge node into the route table. We 2812 * assume the entry is not already in the table. 2813 */ 2814 static int 2815 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2816 { 2817 struct bridge_rtnode *lbrt; 2818 uint32_t hash; 2819 int dir; 2820 2821 BRIDGE_LOCK_ASSERT(sc); 2822 2823 hash = bridge_rthash(sc, brt->brt_addr); 2824 2825 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2826 if (lbrt == NULL) { 2827 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2828 goto out; 2829 } 2830 2831 do { 2832 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2833 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2834 return (EEXIST); 2835 if (dir > 0) { 2836 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2837 goto out; 2838 } 2839 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2840 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2841 goto out; 2842 } 2843 lbrt = LIST_NEXT(lbrt, brt_hash); 2844 } while (lbrt != NULL); 2845 2846 #ifdef DIAGNOSTIC 2847 panic("bridge_rtnode_insert: impossible"); 2848 #endif 2849 2850 out: 2851 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2852 sc->sc_brtcnt++; 2853 2854 return (0); 2855 } 2856 2857 /* 2858 * bridge_rtnode_destroy: 2859 * 2860 * Destroy a bridge rtnode. 2861 */ 2862 static void 2863 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2864 { 2865 BRIDGE_LOCK_ASSERT(sc); 2866 2867 LIST_REMOVE(brt, brt_hash); 2868 2869 LIST_REMOVE(brt, brt_list); 2870 sc->sc_brtcnt--; 2871 brt->brt_dst->bif_addrcnt--; 2872 uma_zfree(bridge_rtnode_zone, brt); 2873 } 2874 2875 /* 2876 * bridge_rtable_expire: 2877 * 2878 * Set the expiry time for all routes on an interface. 2879 */ 2880 static void 2881 bridge_rtable_expire(struct ifnet *ifp, int age) 2882 { 2883 struct bridge_softc *sc = ifp->if_bridge; 2884 struct bridge_rtnode *brt; 2885 2886 BRIDGE_LOCK(sc); 2887 2888 /* 2889 * If the age is zero then flush, otherwise set all the expiry times to 2890 * age for the interface 2891 */ 2892 if (age == 0) 2893 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2894 else { 2895 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2896 /* Cap the expiry time to 'age' */ 2897 if (brt->brt_ifp == ifp && 2898 brt->brt_expire > time_uptime + age && 2899 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2900 brt->brt_expire = time_uptime + age; 2901 } 2902 } 2903 BRIDGE_UNLOCK(sc); 2904 } 2905 2906 /* 2907 * bridge_state_change: 2908 * 2909 * Callback from the bridgestp code when a port changes states. 2910 */ 2911 static void 2912 bridge_state_change(struct ifnet *ifp, int state) 2913 { 2914 struct bridge_softc *sc = ifp->if_bridge; 2915 static const char *stpstates[] = { 2916 "disabled", 2917 "listening", 2918 "learning", 2919 "forwarding", 2920 "blocking", 2921 "discarding" 2922 }; 2923 2924 if (log_stp) 2925 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2926 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2927 } 2928 2929 /* 2930 * Send bridge packets through pfil if they are one of the types pfil can deal 2931 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2932 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2933 * that interface. 2934 */ 2935 static int 2936 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2937 { 2938 int snap, error, i, hlen; 2939 struct ether_header *eh1, eh2; 2940 struct ip_fw_args args; 2941 struct ip *ip; 2942 struct llc llc1; 2943 u_int16_t ether_type; 2944 2945 snap = 0; 2946 error = -1; /* Default error if not error == 0 */ 2947 2948 #if 0 2949 /* we may return with the IP fields swapped, ensure its not shared */ 2950 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2951 #endif 2952 2953 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2954 return (0); /* filtering is disabled */ 2955 2956 i = min((*mp)->m_pkthdr.len, max_protohdr); 2957 if ((*mp)->m_len < i) { 2958 *mp = m_pullup(*mp, i); 2959 if (*mp == NULL) { 2960 printf("%s: m_pullup failed\n", __func__); 2961 return (-1); 2962 } 2963 } 2964 2965 eh1 = mtod(*mp, struct ether_header *); 2966 ether_type = ntohs(eh1->ether_type); 2967 2968 /* 2969 * Check for SNAP/LLC. 2970 */ 2971 if (ether_type < ETHERMTU) { 2972 struct llc *llc2 = (struct llc *)(eh1 + 1); 2973 2974 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2975 llc2->llc_dsap == LLC_SNAP_LSAP && 2976 llc2->llc_ssap == LLC_SNAP_LSAP && 2977 llc2->llc_control == LLC_UI) { 2978 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2979 snap = 1; 2980 } 2981 } 2982 2983 /* 2984 * If we're trying to filter bridge traffic, don't look at anything 2985 * other than IP and ARP traffic. If the filter doesn't understand 2986 * IPv6, don't allow IPv6 through the bridge either. This is lame 2987 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2988 * but of course we don't have an AppleTalk filter to begin with. 2989 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2990 * ARP traffic.) 2991 */ 2992 switch (ether_type) { 2993 case ETHERTYPE_ARP: 2994 case ETHERTYPE_REVARP: 2995 if (pfil_ipfw_arp == 0) 2996 return (0); /* Automatically pass */ 2997 break; 2998 2999 case ETHERTYPE_IP: 3000 #ifdef INET6 3001 case ETHERTYPE_IPV6: 3002 #endif /* INET6 */ 3003 break; 3004 default: 3005 /* 3006 * Check to see if the user wants to pass non-ip 3007 * packets, these will not be checked by pfil(9) and 3008 * passed unconditionally so the default is to drop. 3009 */ 3010 if (pfil_onlyip) 3011 goto bad; 3012 } 3013 3014 /* Strip off the Ethernet header and keep a copy. */ 3015 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3016 m_adj(*mp, ETHER_HDR_LEN); 3017 3018 /* Strip off snap header, if present */ 3019 if (snap) { 3020 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3021 m_adj(*mp, sizeof(struct llc)); 3022 } 3023 3024 /* 3025 * Check the IP header for alignment and errors 3026 */ 3027 if (dir == PFIL_IN) { 3028 switch (ether_type) { 3029 case ETHERTYPE_IP: 3030 error = bridge_ip_checkbasic(mp); 3031 break; 3032 #ifdef INET6 3033 case ETHERTYPE_IPV6: 3034 error = bridge_ip6_checkbasic(mp); 3035 break; 3036 #endif /* INET6 */ 3037 default: 3038 error = 0; 3039 } 3040 if (error) 3041 goto bad; 3042 } 3043 3044 if (ip_fw_chk_ptr && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3045 INIT_VNET_INET(curvnet); 3046 struct dn_pkt_tag *dn_tag; 3047 3048 error = -1; 3049 dn_tag = ip_dn_claim_tag(*mp); 3050 if (dn_tag != NULL) { 3051 if (dn_tag->rule != NULL && V_fw_one_pass) 3052 /* packet already partially processed */ 3053 goto ipfwpass; 3054 args.rule = dn_tag->rule; /* matching rule to restart */ 3055 args.rule_id = dn_tag->rule_id; 3056 args.chain_id = dn_tag->chain_id; 3057 } else 3058 args.rule = NULL; 3059 3060 args.m = *mp; 3061 args.oif = ifp; 3062 args.next_hop = NULL; 3063 args.eh = &eh2; 3064 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3065 i = ip_fw_chk_ptr(&args); 3066 *mp = args.m; 3067 3068 if (*mp == NULL) 3069 return (error); 3070 3071 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) { 3072 3073 /* put the Ethernet header back on */ 3074 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3075 if (*mp == NULL) 3076 return (error); 3077 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3078 3079 /* 3080 * Pass the pkt to dummynet, which consumes it. The 3081 * packet will return to us via bridge_dummynet(). 3082 */ 3083 args.oif = ifp; 3084 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3085 return (error); 3086 } 3087 3088 if (i != IP_FW_PASS) /* drop */ 3089 goto bad; 3090 } 3091 3092 ipfwpass: 3093 error = 0; 3094 3095 /* 3096 * Run the packet through pfil 3097 */ 3098 switch (ether_type) { 3099 case ETHERTYPE_IP: 3100 /* 3101 * before calling the firewall, swap fields the same as 3102 * IP does. here we assume the header is contiguous 3103 */ 3104 ip = mtod(*mp, struct ip *); 3105 3106 ip->ip_len = ntohs(ip->ip_len); 3107 ip->ip_off = ntohs(ip->ip_off); 3108 3109 /* 3110 * Run pfil on the member interface and the bridge, both can 3111 * be skipped by clearing pfil_member or pfil_bridge. 3112 * 3113 * Keep the order: 3114 * in_if -> bridge_if -> out_if 3115 */ 3116 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3117 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3118 dir, NULL); 3119 3120 if (*mp == NULL || error != 0) /* filter may consume */ 3121 break; 3122 3123 if (pfil_member && ifp != NULL) 3124 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3125 dir, NULL); 3126 3127 if (*mp == NULL || error != 0) /* filter may consume */ 3128 break; 3129 3130 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3131 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3132 dir, NULL); 3133 3134 if (*mp == NULL || error != 0) /* filter may consume */ 3135 break; 3136 3137 /* check if we need to fragment the packet */ 3138 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3139 i = (*mp)->m_pkthdr.len; 3140 if (i > ifp->if_mtu) { 3141 error = bridge_fragment(ifp, *mp, &eh2, snap, 3142 &llc1); 3143 return (error); 3144 } 3145 } 3146 3147 /* Recalculate the ip checksum and restore byte ordering */ 3148 ip = mtod(*mp, struct ip *); 3149 hlen = ip->ip_hl << 2; 3150 if (hlen < sizeof(struct ip)) 3151 goto bad; 3152 if (hlen > (*mp)->m_len) { 3153 if ((*mp = m_pullup(*mp, hlen)) == 0) 3154 goto bad; 3155 ip = mtod(*mp, struct ip *); 3156 if (ip == NULL) 3157 goto bad; 3158 } 3159 ip->ip_len = htons(ip->ip_len); 3160 ip->ip_off = htons(ip->ip_off); 3161 ip->ip_sum = 0; 3162 if (hlen == sizeof(struct ip)) 3163 ip->ip_sum = in_cksum_hdr(ip); 3164 else 3165 ip->ip_sum = in_cksum(*mp, hlen); 3166 3167 break; 3168 #ifdef INET6 3169 case ETHERTYPE_IPV6: 3170 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3171 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3172 dir, NULL); 3173 3174 if (*mp == NULL || error != 0) /* filter may consume */ 3175 break; 3176 3177 if (pfil_member && ifp != NULL) 3178 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3179 dir, NULL); 3180 3181 if (*mp == NULL || error != 0) /* filter may consume */ 3182 break; 3183 3184 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3185 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3186 dir, NULL); 3187 break; 3188 #endif 3189 default: 3190 error = 0; 3191 break; 3192 } 3193 3194 if (*mp == NULL) 3195 return (error); 3196 if (error != 0) 3197 goto bad; 3198 3199 error = -1; 3200 3201 /* 3202 * Finally, put everything back the way it was and return 3203 */ 3204 if (snap) { 3205 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3206 if (*mp == NULL) 3207 return (error); 3208 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3209 } 3210 3211 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3212 if (*mp == NULL) 3213 return (error); 3214 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3215 3216 return (0); 3217 3218 bad: 3219 m_freem(*mp); 3220 *mp = NULL; 3221 return (error); 3222 } 3223 3224 /* 3225 * Perform basic checks on header size since 3226 * pfil assumes ip_input has already processed 3227 * it for it. Cut-and-pasted from ip_input.c. 3228 * Given how simple the IPv6 version is, 3229 * does the IPv4 version really need to be 3230 * this complicated? 3231 * 3232 * XXX Should we update ipstat here, or not? 3233 * XXX Right now we update ipstat but not 3234 * XXX csum_counter. 3235 */ 3236 static int 3237 bridge_ip_checkbasic(struct mbuf **mp) 3238 { 3239 INIT_VNET_INET(curvnet); 3240 struct mbuf *m = *mp; 3241 struct ip *ip; 3242 int len, hlen; 3243 u_short sum; 3244 3245 if (*mp == NULL) 3246 return (-1); 3247 3248 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3249 if ((m = m_copyup(m, sizeof(struct ip), 3250 (max_linkhdr + 3) & ~3)) == NULL) { 3251 /* XXXJRT new stat, please */ 3252 IPSTAT_INC(ips_toosmall); 3253 goto bad; 3254 } 3255 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3256 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3257 IPSTAT_INC(ips_toosmall); 3258 goto bad; 3259 } 3260 } 3261 ip = mtod(m, struct ip *); 3262 if (ip == NULL) goto bad; 3263 3264 if (ip->ip_v != IPVERSION) { 3265 IPSTAT_INC(ips_badvers); 3266 goto bad; 3267 } 3268 hlen = ip->ip_hl << 2; 3269 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3270 IPSTAT_INC(ips_badhlen); 3271 goto bad; 3272 } 3273 if (hlen > m->m_len) { 3274 if ((m = m_pullup(m, hlen)) == 0) { 3275 IPSTAT_INC(ips_badhlen); 3276 goto bad; 3277 } 3278 ip = mtod(m, struct ip *); 3279 if (ip == NULL) goto bad; 3280 } 3281 3282 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3283 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3284 } else { 3285 if (hlen == sizeof(struct ip)) { 3286 sum = in_cksum_hdr(ip); 3287 } else { 3288 sum = in_cksum(m, hlen); 3289 } 3290 } 3291 if (sum) { 3292 IPSTAT_INC(ips_badsum); 3293 goto bad; 3294 } 3295 3296 /* Retrieve the packet length. */ 3297 len = ntohs(ip->ip_len); 3298 3299 /* 3300 * Check for additional length bogosity 3301 */ 3302 if (len < hlen) { 3303 IPSTAT_INC(ips_badlen); 3304 goto bad; 3305 } 3306 3307 /* 3308 * Check that the amount of data in the buffers 3309 * is as at least much as the IP header would have us expect. 3310 * Drop packet if shorter than we expect. 3311 */ 3312 if (m->m_pkthdr.len < len) { 3313 IPSTAT_INC(ips_tooshort); 3314 goto bad; 3315 } 3316 3317 /* Checks out, proceed */ 3318 *mp = m; 3319 return (0); 3320 3321 bad: 3322 *mp = m; 3323 return (-1); 3324 } 3325 3326 #ifdef INET6 3327 /* 3328 * Same as above, but for IPv6. 3329 * Cut-and-pasted from ip6_input.c. 3330 * XXX Should we update ip6stat, or not? 3331 */ 3332 static int 3333 bridge_ip6_checkbasic(struct mbuf **mp) 3334 { 3335 INIT_VNET_INET6(curvnet); 3336 struct mbuf *m = *mp; 3337 struct ip6_hdr *ip6; 3338 3339 /* 3340 * If the IPv6 header is not aligned, slurp it up into a new 3341 * mbuf with space for link headers, in the event we forward 3342 * it. Otherwise, if it is aligned, make sure the entire base 3343 * IPv6 header is in the first mbuf of the chain. 3344 */ 3345 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3346 struct ifnet *inifp = m->m_pkthdr.rcvif; 3347 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3348 (max_linkhdr + 3) & ~3)) == NULL) { 3349 /* XXXJRT new stat, please */ 3350 V_ip6stat.ip6s_toosmall++; 3351 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3352 goto bad; 3353 } 3354 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3355 struct ifnet *inifp = m->m_pkthdr.rcvif; 3356 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3357 V_ip6stat.ip6s_toosmall++; 3358 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3359 goto bad; 3360 } 3361 } 3362 3363 ip6 = mtod(m, struct ip6_hdr *); 3364 3365 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3366 V_ip6stat.ip6s_badvers++; 3367 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3368 goto bad; 3369 } 3370 3371 /* Checks out, proceed */ 3372 *mp = m; 3373 return (0); 3374 3375 bad: 3376 *mp = m; 3377 return (-1); 3378 } 3379 #endif /* INET6 */ 3380 3381 /* 3382 * bridge_fragment: 3383 * 3384 * Return a fragmented mbuf chain. 3385 */ 3386 static int 3387 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3388 int snap, struct llc *llc) 3389 { 3390 INIT_VNET_INET(curvnet); 3391 struct mbuf *m0; 3392 struct ip *ip; 3393 int error = -1; 3394 3395 if (m->m_len < sizeof(struct ip) && 3396 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3397 goto out; 3398 ip = mtod(m, struct ip *); 3399 3400 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3401 CSUM_DELAY_IP); 3402 if (error) 3403 goto out; 3404 3405 /* walk the chain and re-add the Ethernet header */ 3406 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3407 if (error == 0) { 3408 if (snap) { 3409 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3410 if (m0 == NULL) { 3411 error = ENOBUFS; 3412 continue; 3413 } 3414 bcopy(llc, mtod(m0, caddr_t), 3415 sizeof(struct llc)); 3416 } 3417 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3418 if (m0 == NULL) { 3419 error = ENOBUFS; 3420 continue; 3421 } 3422 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3423 } else 3424 m_freem(m); 3425 } 3426 3427 if (error == 0) 3428 IPSTAT_INC(ips_fragmented); 3429 3430 return (error); 3431 3432 out: 3433 if (m != NULL) 3434 m_freem(m); 3435 return (error); 3436 } 3437