1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/mbuf.h> 85 #include <sys/malloc.h> 86 #include <sys/protosw.h> 87 #include <sys/systm.h> 88 #include <sys/jail.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 104 #include <net/bpf.h> 105 #include <net/if.h> 106 #include <net/if_clone.h> 107 #include <net/if_dl.h> 108 #include <net/if_types.h> 109 #include <net/if_var.h> 110 #include <net/pfil.h> 111 #include <net/vnet.h> 112 113 #include <netinet/in.h> /* for struct arpcom */ 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #ifdef INET6 119 #include <netinet/ip6.h> 120 #include <netinet6/ip6_var.h> 121 #endif 122 #if defined(INET) || defined(INET6) 123 #include <netinet/ip_carp.h> 124 #endif 125 #include <machine/in_cksum.h> 126 #include <netinet/if_ether.h> /* for struct arpcom */ 127 #include <net/bridgestp.h> 128 #include <net/if_bridgevar.h> 129 #include <net/if_llc.h> 130 #include <net/if_vlan_var.h> 131 132 #include <net/route.h> 133 134 /* 135 * Size of the route hash table. Must be a power of two. 136 */ 137 #ifndef BRIDGE_RTHASH_SIZE 138 #define BRIDGE_RTHASH_SIZE 1024 139 #endif 140 141 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 142 143 /* 144 * Default maximum number of addresses to cache. 145 */ 146 #ifndef BRIDGE_RTABLE_MAX 147 #define BRIDGE_RTABLE_MAX 2000 148 #endif 149 150 /* 151 * Timeout (in seconds) for entries learned dynamically. 152 */ 153 #ifndef BRIDGE_RTABLE_TIMEOUT 154 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 155 #endif 156 157 /* 158 * Number of seconds between walks of the route list. 159 */ 160 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 161 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 162 #endif 163 164 /* 165 * List of capabilities to possibly mask on the member interface. 166 */ 167 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 168 169 /* 170 * List of capabilities to strip 171 */ 172 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 173 174 /* 175 * Bridge interface list entry. 176 */ 177 struct bridge_iflist { 178 LIST_ENTRY(bridge_iflist) bif_next; 179 struct ifnet *bif_ifp; /* member if */ 180 struct bstp_port bif_stp; /* STP state */ 181 uint32_t bif_flags; /* member if flags */ 182 int bif_savedcaps; /* saved capabilities */ 183 uint32_t bif_addrmax; /* max # of addresses */ 184 uint32_t bif_addrcnt; /* cur. # of addresses */ 185 uint32_t bif_addrexceeded;/* # of address violations */ 186 }; 187 188 /* 189 * Bridge route node. 190 */ 191 struct bridge_rtnode { 192 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 193 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 194 struct bridge_iflist *brt_dst; /* destination if */ 195 unsigned long brt_expire; /* expiration time */ 196 uint8_t brt_flags; /* address flags */ 197 uint8_t brt_addr[ETHER_ADDR_LEN]; 198 uint16_t brt_vlan; /* vlan id */ 199 }; 200 #define brt_ifp brt_dst->bif_ifp 201 202 /* 203 * Software state for each bridge. 204 */ 205 struct bridge_softc { 206 struct ifnet *sc_ifp; /* make this an interface */ 207 LIST_ENTRY(bridge_softc) sc_list; 208 struct mtx sc_mtx; 209 struct cv sc_cv; 210 uint32_t sc_brtmax; /* max # of addresses */ 211 uint32_t sc_brtcnt; /* cur. # of addresses */ 212 uint32_t sc_brttimeout; /* rt timeout in seconds */ 213 struct callout sc_brcallout; /* bridge callout */ 214 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 215 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 216 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 217 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 218 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 219 uint32_t sc_rthash_key; /* key for hash */ 220 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 221 struct bstp_state sc_stp; /* STP state */ 222 uint32_t sc_brtexceeded; /* # of cache drops */ 223 struct ifnet *sc_ifaddr; /* member mac copied from */ 224 u_char sc_defaddr[6]; /* Default MAC address */ 225 }; 226 227 static struct mtx bridge_list_mtx; 228 eventhandler_tag bridge_detach_cookie = NULL; 229 230 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 231 232 uma_zone_t bridge_rtnode_zone; 233 234 static int bridge_clone_create(struct if_clone *, int, caddr_t); 235 static void bridge_clone_destroy(struct ifnet *); 236 237 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 238 static void bridge_mutecaps(struct bridge_softc *); 239 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 240 int); 241 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 242 static void bridge_init(void *); 243 static void bridge_dummynet(struct mbuf *, struct ifnet *); 244 static void bridge_stop(struct ifnet *, int); 245 static int bridge_transmit(struct ifnet *, struct mbuf *); 246 static void bridge_qflush(struct ifnet *); 247 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 248 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 249 struct rtentry *); 250 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 251 struct mbuf *); 252 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 253 254 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 255 struct mbuf *m); 256 257 static void bridge_timer(void *); 258 259 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 260 struct mbuf *, int); 261 static void bridge_span(struct bridge_softc *, struct mbuf *); 262 263 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 264 uint16_t, struct bridge_iflist *, int, uint8_t); 265 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 266 uint16_t); 267 static void bridge_rttrim(struct bridge_softc *); 268 static void bridge_rtage(struct bridge_softc *); 269 static void bridge_rtflush(struct bridge_softc *, int); 270 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 271 uint16_t); 272 273 static int bridge_rtable_init(struct bridge_softc *); 274 static void bridge_rtable_fini(struct bridge_softc *); 275 276 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 277 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 278 const uint8_t *, uint16_t); 279 static int bridge_rtnode_insert(struct bridge_softc *, 280 struct bridge_rtnode *); 281 static void bridge_rtnode_destroy(struct bridge_softc *, 282 struct bridge_rtnode *); 283 static void bridge_rtable_expire(struct ifnet *, int); 284 static void bridge_state_change(struct ifnet *, int); 285 286 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 287 const char *name); 288 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 289 struct ifnet *ifp); 290 static void bridge_delete_member(struct bridge_softc *, 291 struct bridge_iflist *, int); 292 static void bridge_delete_span(struct bridge_softc *, 293 struct bridge_iflist *); 294 295 static int bridge_ioctl_add(struct bridge_softc *, void *); 296 static int bridge_ioctl_del(struct bridge_softc *, void *); 297 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 298 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 299 static int bridge_ioctl_scache(struct bridge_softc *, void *); 300 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 301 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 302 static int bridge_ioctl_rts(struct bridge_softc *, void *); 303 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 304 static int bridge_ioctl_sto(struct bridge_softc *, void *); 305 static int bridge_ioctl_gto(struct bridge_softc *, void *); 306 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 307 static int bridge_ioctl_flush(struct bridge_softc *, void *); 308 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 309 static int bridge_ioctl_spri(struct bridge_softc *, void *); 310 static int bridge_ioctl_ght(struct bridge_softc *, void *); 311 static int bridge_ioctl_sht(struct bridge_softc *, void *); 312 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 313 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 314 static int bridge_ioctl_gma(struct bridge_softc *, void *); 315 static int bridge_ioctl_sma(struct bridge_softc *, void *); 316 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 319 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 320 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 321 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 322 static int bridge_ioctl_grte(struct bridge_softc *, void *); 323 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 324 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 325 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 326 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 327 int); 328 static int bridge_ip_checkbasic(struct mbuf **mp); 329 #ifdef INET6 330 static int bridge_ip6_checkbasic(struct mbuf **mp); 331 #endif /* INET6 */ 332 static int bridge_fragment(struct ifnet *, struct mbuf *, 333 struct ether_header *, int, struct llc *); 334 static void bridge_linkstate(struct ifnet *ifp); 335 static void bridge_linkcheck(struct bridge_softc *sc); 336 337 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 338 339 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 340 #define VLANTAGOF(_m) \ 341 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 342 343 static struct bstp_cb_ops bridge_ops = { 344 .bcb_state = bridge_state_change, 345 .bcb_rtage = bridge_rtable_expire 346 }; 347 348 SYSCTL_DECL(_net_link); 349 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 350 351 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 352 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 353 static int pfil_member = 1; /* run pfil hooks on the member interface */ 354 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 355 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 356 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 357 locally destined packets */ 358 static int log_stp = 0; /* log STP state changes */ 359 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 360 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 362 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 363 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 365 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 366 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 368 &pfil_bridge, 0, "Packet filter on the bridge interface"); 369 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 370 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 371 &pfil_member, 0, "Packet filter on the member interface"); 372 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 373 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 374 &pfil_local_phys, 0, 375 "Packet filter on the physical interface for locally destined packets"); 376 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 377 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 378 &log_stp, 0, "Log STP state changes"); 379 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 380 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 381 &bridge_inherit_mac, 0, 382 "Inherit MAC address from the first bridge member"); 383 384 struct bridge_control { 385 int (*bc_func)(struct bridge_softc *, void *); 386 int bc_argsize; 387 int bc_flags; 388 }; 389 390 #define BC_F_COPYIN 0x01 /* copy arguments in */ 391 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 392 #define BC_F_SUSER 0x04 /* do super-user check */ 393 394 const struct bridge_control bridge_control_table[] = { 395 { bridge_ioctl_add, sizeof(struct ifbreq), 396 BC_F_COPYIN|BC_F_SUSER }, 397 { bridge_ioctl_del, sizeof(struct ifbreq), 398 BC_F_COPYIN|BC_F_SUSER }, 399 400 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 401 BC_F_COPYIN|BC_F_COPYOUT }, 402 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 403 BC_F_COPYIN|BC_F_SUSER }, 404 405 { bridge_ioctl_scache, sizeof(struct ifbrparam), 406 BC_F_COPYIN|BC_F_SUSER }, 407 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 408 BC_F_COPYOUT }, 409 410 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 411 BC_F_COPYIN|BC_F_COPYOUT }, 412 { bridge_ioctl_rts, sizeof(struct ifbaconf), 413 BC_F_COPYIN|BC_F_COPYOUT }, 414 415 { bridge_ioctl_saddr, sizeof(struct ifbareq), 416 BC_F_COPYIN|BC_F_SUSER }, 417 418 { bridge_ioctl_sto, sizeof(struct ifbrparam), 419 BC_F_COPYIN|BC_F_SUSER }, 420 { bridge_ioctl_gto, sizeof(struct ifbrparam), 421 BC_F_COPYOUT }, 422 423 { bridge_ioctl_daddr, sizeof(struct ifbareq), 424 BC_F_COPYIN|BC_F_SUSER }, 425 426 { bridge_ioctl_flush, sizeof(struct ifbreq), 427 BC_F_COPYIN|BC_F_SUSER }, 428 429 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 430 BC_F_COPYOUT }, 431 { bridge_ioctl_spri, sizeof(struct ifbrparam), 432 BC_F_COPYIN|BC_F_SUSER }, 433 434 { bridge_ioctl_ght, sizeof(struct ifbrparam), 435 BC_F_COPYOUT }, 436 { bridge_ioctl_sht, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 439 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 440 BC_F_COPYOUT }, 441 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 442 BC_F_COPYIN|BC_F_SUSER }, 443 444 { bridge_ioctl_gma, sizeof(struct ifbrparam), 445 BC_F_COPYOUT }, 446 { bridge_ioctl_sma, sizeof(struct ifbrparam), 447 BC_F_COPYIN|BC_F_SUSER }, 448 449 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 450 BC_F_COPYIN|BC_F_SUSER }, 451 452 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 453 BC_F_COPYIN|BC_F_SUSER }, 454 455 { bridge_ioctl_addspan, sizeof(struct ifbreq), 456 BC_F_COPYIN|BC_F_SUSER }, 457 { bridge_ioctl_delspan, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 461 BC_F_COPYOUT }, 462 463 { bridge_ioctl_grte, sizeof(struct ifbrparam), 464 BC_F_COPYOUT }, 465 466 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 467 BC_F_COPYIN|BC_F_COPYOUT }, 468 469 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 470 BC_F_COPYIN|BC_F_SUSER }, 471 472 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 473 BC_F_COPYIN|BC_F_SUSER }, 474 475 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 476 BC_F_COPYIN|BC_F_SUSER }, 477 478 }; 479 const int bridge_control_table_size = 480 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 481 482 LIST_HEAD(, bridge_softc) bridge_list; 483 484 IFC_SIMPLE_DECLARE(bridge, 0); 485 486 static int 487 bridge_modevent(module_t mod, int type, void *data) 488 { 489 490 switch (type) { 491 case MOD_LOAD: 492 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 493 if_clone_attach(&bridge_cloner); 494 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 495 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 496 UMA_ALIGN_PTR, 0); 497 LIST_INIT(&bridge_list); 498 bridge_input_p = bridge_input; 499 bridge_output_p = bridge_output; 500 bridge_dn_p = bridge_dummynet; 501 bridge_linkstate_p = bridge_linkstate; 502 bridge_detach_cookie = EVENTHANDLER_REGISTER( 503 ifnet_departure_event, bridge_ifdetach, NULL, 504 EVENTHANDLER_PRI_ANY); 505 break; 506 case MOD_UNLOAD: 507 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 508 bridge_detach_cookie); 509 if_clone_detach(&bridge_cloner); 510 uma_zdestroy(bridge_rtnode_zone); 511 bridge_input_p = NULL; 512 bridge_output_p = NULL; 513 bridge_dn_p = NULL; 514 bridge_linkstate_p = NULL; 515 mtx_destroy(&bridge_list_mtx); 516 break; 517 default: 518 return (EOPNOTSUPP); 519 } 520 return (0); 521 } 522 523 static moduledata_t bridge_mod = { 524 "if_bridge", 525 bridge_modevent, 526 0 527 }; 528 529 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 530 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 531 532 /* 533 * handler for net.link.bridge.pfil_ipfw 534 */ 535 static int 536 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 537 { 538 int enable = pfil_ipfw; 539 int error; 540 541 error = sysctl_handle_int(oidp, &enable, 0, req); 542 enable = (enable) ? 1 : 0; 543 544 if (enable != pfil_ipfw) { 545 pfil_ipfw = enable; 546 547 /* 548 * Disable pfil so that ipfw doesnt run twice, if the user 549 * really wants both then they can re-enable pfil_bridge and/or 550 * pfil_member. Also allow non-ip packets as ipfw can filter by 551 * layer2 type. 552 */ 553 if (pfil_ipfw) { 554 pfil_onlyip = 0; 555 pfil_bridge = 0; 556 pfil_member = 0; 557 } 558 } 559 560 return (error); 561 } 562 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 563 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 564 565 /* 566 * bridge_clone_create: 567 * 568 * Create a new bridge instance. 569 */ 570 static int 571 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 572 { 573 struct bridge_softc *sc, *sc2; 574 struct ifnet *bifp, *ifp; 575 int fb, retry; 576 unsigned long hostid; 577 578 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 579 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 580 if (ifp == NULL) { 581 free(sc, M_DEVBUF); 582 return (ENOSPC); 583 } 584 585 BRIDGE_LOCK_INIT(sc); 586 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 587 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 588 589 /* Initialize our routing table. */ 590 bridge_rtable_init(sc); 591 592 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 593 594 LIST_INIT(&sc->sc_iflist); 595 LIST_INIT(&sc->sc_spanlist); 596 597 ifp->if_softc = sc; 598 if_initname(ifp, ifc->ifc_name, unit); 599 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 600 ifp->if_ioctl = bridge_ioctl; 601 ifp->if_transmit = bridge_transmit; 602 ifp->if_qflush = bridge_qflush; 603 ifp->if_init = bridge_init; 604 ifp->if_type = IFT_BRIDGE; 605 606 /* 607 * Generate an ethernet address with a locally administered address. 608 * 609 * Since we are using random ethernet addresses for the bridge, it is 610 * possible that we might have address collisions, so make sure that 611 * this hardware address isn't already in use on another bridge. 612 * The first try uses the hostid and falls back to arc4rand(). 613 */ 614 fb = 0; 615 getcredhostid(curthread->td_ucred, &hostid); 616 for (retry = 1; retry != 0;) { 617 if (fb || hostid == 0) { 618 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 619 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 620 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 621 } else { 622 sc->sc_defaddr[0] = 0x2; 623 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 624 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 625 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 626 sc->sc_defaddr[4] = hostid & 0xff; 627 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 628 } 629 630 fb = 1; 631 retry = 0; 632 mtx_lock(&bridge_list_mtx); 633 LIST_FOREACH(sc2, &bridge_list, sc_list) { 634 bifp = sc2->sc_ifp; 635 if (memcmp(sc->sc_defaddr, 636 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 637 retry = 1; 638 } 639 mtx_unlock(&bridge_list_mtx); 640 } 641 642 bstp_attach(&sc->sc_stp, &bridge_ops); 643 ether_ifattach(ifp, sc->sc_defaddr); 644 /* Now undo some of the damage... */ 645 ifp->if_baudrate = 0; 646 ifp->if_type = IFT_BRIDGE; 647 648 mtx_lock(&bridge_list_mtx); 649 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 650 mtx_unlock(&bridge_list_mtx); 651 652 return (0); 653 } 654 655 /* 656 * bridge_clone_destroy: 657 * 658 * Destroy a bridge instance. 659 */ 660 static void 661 bridge_clone_destroy(struct ifnet *ifp) 662 { 663 struct bridge_softc *sc = ifp->if_softc; 664 struct bridge_iflist *bif; 665 666 BRIDGE_LOCK(sc); 667 668 bridge_stop(ifp, 1); 669 ifp->if_flags &= ~IFF_UP; 670 671 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 672 bridge_delete_member(sc, bif, 0); 673 674 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 675 bridge_delete_span(sc, bif); 676 } 677 678 BRIDGE_UNLOCK(sc); 679 680 callout_drain(&sc->sc_brcallout); 681 682 mtx_lock(&bridge_list_mtx); 683 LIST_REMOVE(sc, sc_list); 684 mtx_unlock(&bridge_list_mtx); 685 686 bstp_detach(&sc->sc_stp); 687 ether_ifdetach(ifp); 688 if_free(ifp); 689 690 /* Tear down the routing table. */ 691 bridge_rtable_fini(sc); 692 693 BRIDGE_LOCK_DESTROY(sc); 694 free(sc, M_DEVBUF); 695 } 696 697 /* 698 * bridge_ioctl: 699 * 700 * Handle a control request from the operator. 701 */ 702 static int 703 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 704 { 705 struct bridge_softc *sc = ifp->if_softc; 706 struct ifreq *ifr = (struct ifreq *)data; 707 struct bridge_iflist *bif; 708 struct thread *td = curthread; 709 union { 710 struct ifbreq ifbreq; 711 struct ifbifconf ifbifconf; 712 struct ifbareq ifbareq; 713 struct ifbaconf ifbaconf; 714 struct ifbrparam ifbrparam; 715 struct ifbropreq ifbropreq; 716 } args; 717 struct ifdrv *ifd = (struct ifdrv *) data; 718 const struct bridge_control *bc; 719 int error = 0; 720 721 switch (cmd) { 722 723 case SIOCADDMULTI: 724 case SIOCDELMULTI: 725 break; 726 727 case SIOCGDRVSPEC: 728 case SIOCSDRVSPEC: 729 if (ifd->ifd_cmd >= bridge_control_table_size) { 730 error = EINVAL; 731 break; 732 } 733 bc = &bridge_control_table[ifd->ifd_cmd]; 734 735 if (cmd == SIOCGDRVSPEC && 736 (bc->bc_flags & BC_F_COPYOUT) == 0) { 737 error = EINVAL; 738 break; 739 } 740 else if (cmd == SIOCSDRVSPEC && 741 (bc->bc_flags & BC_F_COPYOUT) != 0) { 742 error = EINVAL; 743 break; 744 } 745 746 if (bc->bc_flags & BC_F_SUSER) { 747 error = priv_check(td, PRIV_NET_BRIDGE); 748 if (error) 749 break; 750 } 751 752 if (ifd->ifd_len != bc->bc_argsize || 753 ifd->ifd_len > sizeof(args)) { 754 error = EINVAL; 755 break; 756 } 757 758 bzero(&args, sizeof(args)); 759 if (bc->bc_flags & BC_F_COPYIN) { 760 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 761 if (error) 762 break; 763 } 764 765 BRIDGE_LOCK(sc); 766 error = (*bc->bc_func)(sc, &args); 767 BRIDGE_UNLOCK(sc); 768 if (error) 769 break; 770 771 if (bc->bc_flags & BC_F_COPYOUT) 772 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 773 774 break; 775 776 case SIOCSIFFLAGS: 777 if (!(ifp->if_flags & IFF_UP) && 778 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 779 /* 780 * If interface is marked down and it is running, 781 * then stop and disable it. 782 */ 783 BRIDGE_LOCK(sc); 784 bridge_stop(ifp, 1); 785 BRIDGE_UNLOCK(sc); 786 } else if ((ifp->if_flags & IFF_UP) && 787 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 788 /* 789 * If interface is marked up and it is stopped, then 790 * start it. 791 */ 792 (*ifp->if_init)(sc); 793 } 794 break; 795 796 case SIOCSIFMTU: 797 if (ifr->ifr_mtu < 576) { 798 error = EINVAL; 799 break; 800 } 801 if (LIST_EMPTY(&sc->sc_iflist)) { 802 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 803 break; 804 } 805 BRIDGE_LOCK(sc); 806 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 807 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 808 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 809 " != %d\n", sc->sc_ifp->if_xname, 810 bif->bif_ifp->if_mtu, 811 bif->bif_ifp->if_xname, ifr->ifr_mtu); 812 error = EINVAL; 813 break; 814 } 815 } 816 if (!error) 817 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 818 BRIDGE_UNLOCK(sc); 819 break; 820 default: 821 /* 822 * drop the lock as ether_ioctl() will call bridge_start() and 823 * cause the lock to be recursed. 824 */ 825 error = ether_ioctl(ifp, cmd, data); 826 break; 827 } 828 829 return (error); 830 } 831 832 /* 833 * bridge_mutecaps: 834 * 835 * Clear or restore unwanted capabilities on the member interface 836 */ 837 static void 838 bridge_mutecaps(struct bridge_softc *sc) 839 { 840 struct bridge_iflist *bif; 841 int enabled, mask; 842 843 /* Initial bitmask of capabilities to test */ 844 mask = BRIDGE_IFCAPS_MASK; 845 846 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 847 /* Every member must support it or its disabled */ 848 mask &= bif->bif_savedcaps; 849 } 850 851 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 852 enabled = bif->bif_ifp->if_capenable; 853 enabled &= ~BRIDGE_IFCAPS_STRIP; 854 /* strip off mask bits and enable them again if allowed */ 855 enabled &= ~BRIDGE_IFCAPS_MASK; 856 enabled |= mask; 857 bridge_set_ifcap(sc, bif, enabled); 858 } 859 860 } 861 862 static void 863 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 864 { 865 struct ifnet *ifp = bif->bif_ifp; 866 struct ifreq ifr; 867 int error; 868 869 bzero(&ifr, sizeof(ifr)); 870 ifr.ifr_reqcap = set; 871 872 if (ifp->if_capenable != set) { 873 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 874 if (error) 875 if_printf(sc->sc_ifp, 876 "error setting interface capabilities on %s\n", 877 ifp->if_xname); 878 } 879 } 880 881 /* 882 * bridge_lookup_member: 883 * 884 * Lookup a bridge member interface. 885 */ 886 static struct bridge_iflist * 887 bridge_lookup_member(struct bridge_softc *sc, const char *name) 888 { 889 struct bridge_iflist *bif; 890 struct ifnet *ifp; 891 892 BRIDGE_LOCK_ASSERT(sc); 893 894 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 895 ifp = bif->bif_ifp; 896 if (strcmp(ifp->if_xname, name) == 0) 897 return (bif); 898 } 899 900 return (NULL); 901 } 902 903 /* 904 * bridge_lookup_member_if: 905 * 906 * Lookup a bridge member interface by ifnet*. 907 */ 908 static struct bridge_iflist * 909 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 910 { 911 struct bridge_iflist *bif; 912 913 BRIDGE_LOCK_ASSERT(sc); 914 915 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 916 if (bif->bif_ifp == member_ifp) 917 return (bif); 918 } 919 920 return (NULL); 921 } 922 923 /* 924 * bridge_delete_member: 925 * 926 * Delete the specified member interface. 927 */ 928 static void 929 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 930 int gone) 931 { 932 struct ifnet *ifs = bif->bif_ifp; 933 struct ifnet *fif = NULL; 934 935 BRIDGE_LOCK_ASSERT(sc); 936 937 if (bif->bif_flags & IFBIF_STP) 938 bstp_disable(&bif->bif_stp); 939 940 ifs->if_bridge = NULL; 941 BRIDGE_XLOCK(sc); 942 LIST_REMOVE(bif, bif_next); 943 BRIDGE_XDROP(sc); 944 945 /* 946 * If removing the interface that gave the bridge its mac address, set 947 * the mac address of the bridge to the address of the next member, or 948 * to its default address if no members are left. 949 */ 950 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 951 if (LIST_EMPTY(&sc->sc_iflist)) { 952 bcopy(sc->sc_defaddr, 953 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 954 sc->sc_ifaddr = NULL; 955 } else { 956 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 957 bcopy(IF_LLADDR(fif), 958 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 959 sc->sc_ifaddr = fif; 960 } 961 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 962 } 963 964 bridge_linkcheck(sc); 965 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 966 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 967 KASSERT(bif->bif_addrcnt == 0, 968 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 969 970 BRIDGE_UNLOCK(sc); 971 if (!gone) { 972 switch (ifs->if_type) { 973 case IFT_ETHER: 974 case IFT_L2VLAN: 975 /* 976 * Take the interface out of promiscuous mode. 977 */ 978 (void) ifpromisc(ifs, 0); 979 break; 980 981 case IFT_GIF: 982 break; 983 984 default: 985 #ifdef DIAGNOSTIC 986 panic("bridge_delete_member: impossible"); 987 #endif 988 break; 989 } 990 /* reneable any interface capabilities */ 991 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 992 } 993 bstp_destroy(&bif->bif_stp); /* prepare to free */ 994 BRIDGE_LOCK(sc); 995 free(bif, M_DEVBUF); 996 } 997 998 /* 999 * bridge_delete_span: 1000 * 1001 * Delete the specified span interface. 1002 */ 1003 static void 1004 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1005 { 1006 BRIDGE_LOCK_ASSERT(sc); 1007 1008 KASSERT(bif->bif_ifp->if_bridge == NULL, 1009 ("%s: not a span interface", __func__)); 1010 1011 LIST_REMOVE(bif, bif_next); 1012 free(bif, M_DEVBUF); 1013 } 1014 1015 static int 1016 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1017 { 1018 struct ifbreq *req = arg; 1019 struct bridge_iflist *bif = NULL; 1020 struct ifnet *ifs; 1021 int error = 0; 1022 1023 ifs = ifunit(req->ifbr_ifsname); 1024 if (ifs == NULL) 1025 return (ENOENT); 1026 if (ifs->if_ioctl == NULL) /* must be supported */ 1027 return (EINVAL); 1028 1029 /* If it's in the span list, it can't be a member. */ 1030 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1031 if (ifs == bif->bif_ifp) 1032 return (EBUSY); 1033 1034 if (ifs->if_bridge == sc) 1035 return (EEXIST); 1036 1037 if (ifs->if_bridge != NULL) 1038 return (EBUSY); 1039 1040 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1041 if (bif == NULL) 1042 return (ENOMEM); 1043 1044 bif->bif_ifp = ifs; 1045 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1046 bif->bif_savedcaps = ifs->if_capenable; 1047 1048 switch (ifs->if_type) { 1049 case IFT_ETHER: 1050 case IFT_L2VLAN: 1051 case IFT_GIF: 1052 /* permitted interface types */ 1053 break; 1054 default: 1055 error = EINVAL; 1056 goto out; 1057 } 1058 1059 /* Allow the first Ethernet member to define the MTU */ 1060 if (LIST_EMPTY(&sc->sc_iflist)) 1061 sc->sc_ifp->if_mtu = ifs->if_mtu; 1062 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1063 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1064 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1065 error = EINVAL; 1066 goto out; 1067 } 1068 1069 /* 1070 * Assign the interface's MAC address to the bridge if it's the first 1071 * member and the MAC address of the bridge has not been changed from 1072 * the default randomly generated one. 1073 */ 1074 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1075 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1076 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1077 sc->sc_ifaddr = ifs; 1078 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1079 } 1080 1081 ifs->if_bridge = sc; 1082 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1083 /* 1084 * XXX: XLOCK HERE!?! 1085 * 1086 * NOTE: insert_***HEAD*** should be safe for the traversals. 1087 */ 1088 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1089 1090 /* Set interface capabilities to the intersection set of all members */ 1091 bridge_mutecaps(sc); 1092 bridge_linkcheck(sc); 1093 1094 /* Place the interface into promiscuous mode */ 1095 switch (ifs->if_type) { 1096 case IFT_ETHER: 1097 case IFT_L2VLAN: 1098 BRIDGE_UNLOCK(sc); 1099 error = ifpromisc(ifs, 1); 1100 BRIDGE_LOCK(sc); 1101 break; 1102 } 1103 if (error) 1104 bridge_delete_member(sc, bif, 0); 1105 out: 1106 if (error) { 1107 if (bif != NULL) 1108 free(bif, M_DEVBUF); 1109 } 1110 return (error); 1111 } 1112 1113 static int 1114 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1115 { 1116 struct ifbreq *req = arg; 1117 struct bridge_iflist *bif; 1118 1119 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1120 if (bif == NULL) 1121 return (ENOENT); 1122 1123 bridge_delete_member(sc, bif, 0); 1124 1125 return (0); 1126 } 1127 1128 static int 1129 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1130 { 1131 struct ifbreq *req = arg; 1132 struct bridge_iflist *bif; 1133 struct bstp_port *bp; 1134 1135 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1136 if (bif == NULL) 1137 return (ENOENT); 1138 1139 bp = &bif->bif_stp; 1140 req->ifbr_ifsflags = bif->bif_flags; 1141 req->ifbr_state = bp->bp_state; 1142 req->ifbr_priority = bp->bp_priority; 1143 req->ifbr_path_cost = bp->bp_path_cost; 1144 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1145 req->ifbr_proto = bp->bp_protover; 1146 req->ifbr_role = bp->bp_role; 1147 req->ifbr_stpflags = bp->bp_flags; 1148 req->ifbr_addrcnt = bif->bif_addrcnt; 1149 req->ifbr_addrmax = bif->bif_addrmax; 1150 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1151 1152 /* Copy STP state options as flags */ 1153 if (bp->bp_operedge) 1154 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1155 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1156 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1157 if (bp->bp_ptp_link) 1158 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1159 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1160 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1161 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1162 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1163 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1164 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1165 return (0); 1166 } 1167 1168 static int 1169 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1170 { 1171 struct ifbreq *req = arg; 1172 struct bridge_iflist *bif; 1173 struct bstp_port *bp; 1174 int error; 1175 1176 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1177 if (bif == NULL) 1178 return (ENOENT); 1179 bp = &bif->bif_stp; 1180 1181 if (req->ifbr_ifsflags & IFBIF_SPAN) 1182 /* SPAN is readonly */ 1183 return (EINVAL); 1184 1185 if (req->ifbr_ifsflags & IFBIF_STP) { 1186 if ((bif->bif_flags & IFBIF_STP) == 0) { 1187 error = bstp_enable(&bif->bif_stp); 1188 if (error) 1189 return (error); 1190 } 1191 } else { 1192 if ((bif->bif_flags & IFBIF_STP) != 0) 1193 bstp_disable(&bif->bif_stp); 1194 } 1195 1196 /* Pass on STP flags */ 1197 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1198 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1199 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1200 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1201 1202 /* Save the bits relating to the bridge */ 1203 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1204 1205 return (0); 1206 } 1207 1208 static int 1209 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1210 { 1211 struct ifbrparam *param = arg; 1212 1213 sc->sc_brtmax = param->ifbrp_csize; 1214 bridge_rttrim(sc); 1215 1216 return (0); 1217 } 1218 1219 static int 1220 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1221 { 1222 struct ifbrparam *param = arg; 1223 1224 param->ifbrp_csize = sc->sc_brtmax; 1225 1226 return (0); 1227 } 1228 1229 static int 1230 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1231 { 1232 struct ifbifconf *bifc = arg; 1233 struct bridge_iflist *bif; 1234 struct ifbreq breq; 1235 char *buf, *outbuf; 1236 int count, buflen, len, error = 0; 1237 1238 count = 0; 1239 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1240 count++; 1241 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1242 count++; 1243 1244 buflen = sizeof(breq) * count; 1245 if (bifc->ifbic_len == 0) { 1246 bifc->ifbic_len = buflen; 1247 return (0); 1248 } 1249 BRIDGE_UNLOCK(sc); 1250 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1251 BRIDGE_LOCK(sc); 1252 1253 count = 0; 1254 buf = outbuf; 1255 len = min(bifc->ifbic_len, buflen); 1256 bzero(&breq, sizeof(breq)); 1257 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1258 if (len < sizeof(breq)) 1259 break; 1260 1261 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1262 sizeof(breq.ifbr_ifsname)); 1263 /* Fill in the ifbreq structure */ 1264 error = bridge_ioctl_gifflags(sc, &breq); 1265 if (error) 1266 break; 1267 memcpy(buf, &breq, sizeof(breq)); 1268 count++; 1269 buf += sizeof(breq); 1270 len -= sizeof(breq); 1271 } 1272 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1273 if (len < sizeof(breq)) 1274 break; 1275 1276 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1277 sizeof(breq.ifbr_ifsname)); 1278 breq.ifbr_ifsflags = bif->bif_flags; 1279 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1280 memcpy(buf, &breq, sizeof(breq)); 1281 count++; 1282 buf += sizeof(breq); 1283 len -= sizeof(breq); 1284 } 1285 1286 BRIDGE_UNLOCK(sc); 1287 bifc->ifbic_len = sizeof(breq) * count; 1288 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1289 BRIDGE_LOCK(sc); 1290 free(outbuf, M_TEMP); 1291 return (error); 1292 } 1293 1294 static int 1295 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1296 { 1297 struct ifbaconf *bac = arg; 1298 struct bridge_rtnode *brt; 1299 struct ifbareq bareq; 1300 char *buf, *outbuf; 1301 int count, buflen, len, error = 0; 1302 1303 if (bac->ifbac_len == 0) 1304 return (0); 1305 1306 count = 0; 1307 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1308 count++; 1309 buflen = sizeof(bareq) * count; 1310 1311 BRIDGE_UNLOCK(sc); 1312 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1313 BRIDGE_LOCK(sc); 1314 1315 count = 0; 1316 buf = outbuf; 1317 len = min(bac->ifbac_len, buflen); 1318 bzero(&bareq, sizeof(bareq)); 1319 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1320 if (len < sizeof(bareq)) 1321 goto out; 1322 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1323 sizeof(bareq.ifba_ifsname)); 1324 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1325 bareq.ifba_vlan = brt->brt_vlan; 1326 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1327 time_uptime < brt->brt_expire) 1328 bareq.ifba_expire = brt->brt_expire - time_uptime; 1329 else 1330 bareq.ifba_expire = 0; 1331 bareq.ifba_flags = brt->brt_flags; 1332 1333 memcpy(buf, &bareq, sizeof(bareq)); 1334 count++; 1335 buf += sizeof(bareq); 1336 len -= sizeof(bareq); 1337 } 1338 out: 1339 BRIDGE_UNLOCK(sc); 1340 bac->ifbac_len = sizeof(bareq) * count; 1341 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1342 BRIDGE_LOCK(sc); 1343 free(outbuf, M_TEMP); 1344 return (error); 1345 } 1346 1347 static int 1348 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1349 { 1350 struct ifbareq *req = arg; 1351 struct bridge_iflist *bif; 1352 int error; 1353 1354 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1355 if (bif == NULL) 1356 return (ENOENT); 1357 1358 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1359 req->ifba_flags); 1360 1361 return (error); 1362 } 1363 1364 static int 1365 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1366 { 1367 struct ifbrparam *param = arg; 1368 1369 sc->sc_brttimeout = param->ifbrp_ctime; 1370 return (0); 1371 } 1372 1373 static int 1374 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1375 { 1376 struct ifbrparam *param = arg; 1377 1378 param->ifbrp_ctime = sc->sc_brttimeout; 1379 return (0); 1380 } 1381 1382 static int 1383 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1384 { 1385 struct ifbareq *req = arg; 1386 1387 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1388 } 1389 1390 static int 1391 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1392 { 1393 struct ifbreq *req = arg; 1394 1395 bridge_rtflush(sc, req->ifbr_ifsflags); 1396 return (0); 1397 } 1398 1399 static int 1400 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1401 { 1402 struct ifbrparam *param = arg; 1403 struct bstp_state *bs = &sc->sc_stp; 1404 1405 param->ifbrp_prio = bs->bs_bridge_priority; 1406 return (0); 1407 } 1408 1409 static int 1410 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1411 { 1412 struct ifbrparam *param = arg; 1413 1414 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1415 } 1416 1417 static int 1418 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1419 { 1420 struct ifbrparam *param = arg; 1421 struct bstp_state *bs = &sc->sc_stp; 1422 1423 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1424 return (0); 1425 } 1426 1427 static int 1428 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1429 { 1430 struct ifbrparam *param = arg; 1431 1432 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1433 } 1434 1435 static int 1436 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1437 { 1438 struct ifbrparam *param = arg; 1439 struct bstp_state *bs = &sc->sc_stp; 1440 1441 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1442 return (0); 1443 } 1444 1445 static int 1446 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1447 { 1448 struct ifbrparam *param = arg; 1449 1450 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1451 } 1452 1453 static int 1454 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1455 { 1456 struct ifbrparam *param = arg; 1457 struct bstp_state *bs = &sc->sc_stp; 1458 1459 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1460 return (0); 1461 } 1462 1463 static int 1464 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1465 { 1466 struct ifbrparam *param = arg; 1467 1468 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1469 } 1470 1471 static int 1472 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1473 { 1474 struct ifbreq *req = arg; 1475 struct bridge_iflist *bif; 1476 1477 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1478 if (bif == NULL) 1479 return (ENOENT); 1480 1481 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1482 } 1483 1484 static int 1485 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1486 { 1487 struct ifbreq *req = arg; 1488 struct bridge_iflist *bif; 1489 1490 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1491 if (bif == NULL) 1492 return (ENOENT); 1493 1494 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1495 } 1496 1497 static int 1498 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1499 { 1500 struct ifbreq *req = arg; 1501 struct bridge_iflist *bif; 1502 1503 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1504 if (bif == NULL) 1505 return (ENOENT); 1506 1507 bif->bif_addrmax = req->ifbr_addrmax; 1508 return (0); 1509 } 1510 1511 static int 1512 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1513 { 1514 struct ifbreq *req = arg; 1515 struct bridge_iflist *bif = NULL; 1516 struct ifnet *ifs; 1517 1518 ifs = ifunit(req->ifbr_ifsname); 1519 if (ifs == NULL) 1520 return (ENOENT); 1521 1522 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1523 if (ifs == bif->bif_ifp) 1524 return (EBUSY); 1525 1526 if (ifs->if_bridge != NULL) 1527 return (EBUSY); 1528 1529 switch (ifs->if_type) { 1530 case IFT_ETHER: 1531 case IFT_GIF: 1532 case IFT_L2VLAN: 1533 break; 1534 default: 1535 return (EINVAL); 1536 } 1537 1538 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1539 if (bif == NULL) 1540 return (ENOMEM); 1541 1542 bif->bif_ifp = ifs; 1543 bif->bif_flags = IFBIF_SPAN; 1544 1545 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1546 1547 return (0); 1548 } 1549 1550 static int 1551 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1552 { 1553 struct ifbreq *req = arg; 1554 struct bridge_iflist *bif; 1555 struct ifnet *ifs; 1556 1557 ifs = ifunit(req->ifbr_ifsname); 1558 if (ifs == NULL) 1559 return (ENOENT); 1560 1561 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1562 if (ifs == bif->bif_ifp) 1563 break; 1564 1565 if (bif == NULL) 1566 return (ENOENT); 1567 1568 bridge_delete_span(sc, bif); 1569 1570 return (0); 1571 } 1572 1573 static int 1574 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1575 { 1576 struct ifbropreq *req = arg; 1577 struct bstp_state *bs = &sc->sc_stp; 1578 struct bstp_port *root_port; 1579 1580 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1581 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1582 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1583 1584 root_port = bs->bs_root_port; 1585 if (root_port == NULL) 1586 req->ifbop_root_port = 0; 1587 else 1588 req->ifbop_root_port = root_port->bp_ifp->if_index; 1589 1590 req->ifbop_holdcount = bs->bs_txholdcount; 1591 req->ifbop_priority = bs->bs_bridge_priority; 1592 req->ifbop_protocol = bs->bs_protover; 1593 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1594 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1595 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1596 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1597 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1598 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1599 1600 return (0); 1601 } 1602 1603 static int 1604 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1605 { 1606 struct ifbrparam *param = arg; 1607 1608 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1609 return (0); 1610 } 1611 1612 static int 1613 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1614 { 1615 struct ifbpstpconf *bifstp = arg; 1616 struct bridge_iflist *bif; 1617 struct bstp_port *bp; 1618 struct ifbpstpreq bpreq; 1619 char *buf, *outbuf; 1620 int count, buflen, len, error = 0; 1621 1622 count = 0; 1623 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1624 if ((bif->bif_flags & IFBIF_STP) != 0) 1625 count++; 1626 } 1627 1628 buflen = sizeof(bpreq) * count; 1629 if (bifstp->ifbpstp_len == 0) { 1630 bifstp->ifbpstp_len = buflen; 1631 return (0); 1632 } 1633 1634 BRIDGE_UNLOCK(sc); 1635 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1636 BRIDGE_LOCK(sc); 1637 1638 count = 0; 1639 buf = outbuf; 1640 len = min(bifstp->ifbpstp_len, buflen); 1641 bzero(&bpreq, sizeof(bpreq)); 1642 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1643 if (len < sizeof(bpreq)) 1644 break; 1645 1646 if ((bif->bif_flags & IFBIF_STP) == 0) 1647 continue; 1648 1649 bp = &bif->bif_stp; 1650 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1651 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1652 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1653 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1654 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1655 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1656 1657 memcpy(buf, &bpreq, sizeof(bpreq)); 1658 count++; 1659 buf += sizeof(bpreq); 1660 len -= sizeof(bpreq); 1661 } 1662 1663 BRIDGE_UNLOCK(sc); 1664 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1665 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1666 BRIDGE_LOCK(sc); 1667 free(outbuf, M_TEMP); 1668 return (error); 1669 } 1670 1671 static int 1672 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1673 { 1674 struct ifbrparam *param = arg; 1675 1676 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1677 } 1678 1679 static int 1680 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1681 { 1682 struct ifbrparam *param = arg; 1683 1684 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1685 } 1686 1687 /* 1688 * bridge_ifdetach: 1689 * 1690 * Detach an interface from a bridge. Called when a member 1691 * interface is detaching. 1692 */ 1693 static void 1694 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1695 { 1696 struct bridge_softc *sc = ifp->if_bridge; 1697 struct bridge_iflist *bif; 1698 1699 /* Check if the interface is a bridge member */ 1700 if (sc != NULL) { 1701 BRIDGE_LOCK(sc); 1702 1703 bif = bridge_lookup_member_if(sc, ifp); 1704 if (bif != NULL) 1705 bridge_delete_member(sc, bif, 1); 1706 1707 BRIDGE_UNLOCK(sc); 1708 return; 1709 } 1710 1711 /* Check if the interface is a span port */ 1712 mtx_lock(&bridge_list_mtx); 1713 LIST_FOREACH(sc, &bridge_list, sc_list) { 1714 BRIDGE_LOCK(sc); 1715 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1716 if (ifp == bif->bif_ifp) { 1717 bridge_delete_span(sc, bif); 1718 break; 1719 } 1720 1721 BRIDGE_UNLOCK(sc); 1722 } 1723 mtx_unlock(&bridge_list_mtx); 1724 } 1725 1726 /* 1727 * bridge_init: 1728 * 1729 * Initialize a bridge interface. 1730 */ 1731 static void 1732 bridge_init(void *xsc) 1733 { 1734 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1735 struct ifnet *ifp = sc->sc_ifp; 1736 1737 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1738 return; 1739 1740 BRIDGE_LOCK(sc); 1741 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1742 bridge_timer, sc); 1743 1744 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1745 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1746 1747 BRIDGE_UNLOCK(sc); 1748 } 1749 1750 /* 1751 * bridge_stop: 1752 * 1753 * Stop the bridge interface. 1754 */ 1755 static void 1756 bridge_stop(struct ifnet *ifp, int disable) 1757 { 1758 struct bridge_softc *sc = ifp->if_softc; 1759 1760 BRIDGE_LOCK_ASSERT(sc); 1761 1762 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1763 return; 1764 1765 callout_stop(&sc->sc_brcallout); 1766 bstp_stop(&sc->sc_stp); 1767 1768 bridge_rtflush(sc, IFBF_FLUSHDYN); 1769 1770 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1771 } 1772 1773 /* 1774 * bridge_enqueue: 1775 * 1776 * Enqueue a packet on a bridge member interface. 1777 * 1778 */ 1779 static int 1780 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1781 { 1782 int len, err = 0; 1783 short mflags; 1784 struct mbuf *m0; 1785 1786 len = m->m_pkthdr.len; 1787 mflags = m->m_flags; 1788 1789 /* We may be sending a fragment so traverse the mbuf */ 1790 for (; m; m = m0) { 1791 m0 = m->m_nextpkt; 1792 m->m_nextpkt = NULL; 1793 1794 /* 1795 * If underlying interface can not do VLAN tag insertion itself 1796 * then attach a packet tag that holds it. 1797 */ 1798 if ((m->m_flags & M_VLANTAG) && 1799 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1800 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1801 if (m == NULL) { 1802 if_printf(dst_ifp, 1803 "unable to prepend VLAN header\n"); 1804 dst_ifp->if_oerrors++; 1805 continue; 1806 } 1807 m->m_flags &= ~M_VLANTAG; 1808 } 1809 1810 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1811 m_freem(m0); 1812 break; 1813 } 1814 } 1815 1816 if (err == 0) { 1817 sc->sc_ifp->if_opackets++; 1818 sc->sc_ifp->if_obytes += len; 1819 if (mflags & M_MCAST) 1820 sc->sc_ifp->if_omcasts++; 1821 } 1822 1823 return (err); 1824 } 1825 1826 /* 1827 * bridge_dummynet: 1828 * 1829 * Receive a queued packet from dummynet and pass it on to the output 1830 * interface. 1831 * 1832 * The mbuf has the Ethernet header already attached. 1833 */ 1834 static void 1835 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1836 { 1837 struct bridge_softc *sc; 1838 1839 sc = ifp->if_bridge; 1840 1841 /* 1842 * The packet didnt originate from a member interface. This should only 1843 * ever happen if a member interface is removed while packets are 1844 * queued for it. 1845 */ 1846 if (sc == NULL) { 1847 m_freem(m); 1848 return; 1849 } 1850 1851 if (PFIL_HOOKED(&V_inet_pfil_hook) 1852 #ifdef INET6 1853 || PFIL_HOOKED(&V_inet6_pfil_hook) 1854 #endif 1855 ) { 1856 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1857 return; 1858 if (m == NULL) 1859 return; 1860 } 1861 1862 bridge_enqueue(sc, ifp, m); 1863 } 1864 1865 /* 1866 * bridge_output: 1867 * 1868 * Send output from a bridge member interface. This 1869 * performs the bridging function for locally originated 1870 * packets. 1871 * 1872 * The mbuf has the Ethernet header already attached. We must 1873 * enqueue or free the mbuf before returning. 1874 */ 1875 static int 1876 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1877 struct rtentry *rt) 1878 { 1879 struct ether_header *eh; 1880 struct ifnet *dst_if; 1881 struct bridge_softc *sc; 1882 uint16_t vlan; 1883 1884 if (m->m_len < ETHER_HDR_LEN) { 1885 m = m_pullup(m, ETHER_HDR_LEN); 1886 if (m == NULL) 1887 return (0); 1888 } 1889 1890 eh = mtod(m, struct ether_header *); 1891 sc = ifp->if_bridge; 1892 vlan = VLANTAGOF(m); 1893 1894 BRIDGE_LOCK(sc); 1895 1896 /* 1897 * If bridge is down, but the original output interface is up, 1898 * go ahead and send out that interface. Otherwise, the packet 1899 * is dropped below. 1900 */ 1901 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1902 dst_if = ifp; 1903 goto sendunicast; 1904 } 1905 1906 /* 1907 * If the packet is a multicast, or we don't know a better way to 1908 * get there, send to all interfaces. 1909 */ 1910 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1911 dst_if = NULL; 1912 else 1913 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1914 if (dst_if == NULL) { 1915 struct bridge_iflist *bif; 1916 struct mbuf *mc; 1917 int error = 0, used = 0; 1918 1919 bridge_span(sc, m); 1920 1921 BRIDGE_LOCK2REF(sc, error); 1922 if (error) { 1923 m_freem(m); 1924 return (0); 1925 } 1926 1927 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1928 dst_if = bif->bif_ifp; 1929 1930 if (dst_if->if_type == IFT_GIF) 1931 continue; 1932 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1933 continue; 1934 1935 /* 1936 * If this is not the original output interface, 1937 * and the interface is participating in spanning 1938 * tree, make sure the port is in a state that 1939 * allows forwarding. 1940 */ 1941 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1942 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1943 continue; 1944 1945 if (LIST_NEXT(bif, bif_next) == NULL) { 1946 used = 1; 1947 mc = m; 1948 } else { 1949 mc = m_copypacket(m, M_DONTWAIT); 1950 if (mc == NULL) { 1951 sc->sc_ifp->if_oerrors++; 1952 continue; 1953 } 1954 } 1955 1956 bridge_enqueue(sc, dst_if, mc); 1957 } 1958 if (used == 0) 1959 m_freem(m); 1960 BRIDGE_UNREF(sc); 1961 return (0); 1962 } 1963 1964 sendunicast: 1965 /* 1966 * XXX Spanning tree consideration here? 1967 */ 1968 1969 bridge_span(sc, m); 1970 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1971 m_freem(m); 1972 BRIDGE_UNLOCK(sc); 1973 return (0); 1974 } 1975 1976 BRIDGE_UNLOCK(sc); 1977 bridge_enqueue(sc, dst_if, m); 1978 return (0); 1979 } 1980 1981 /* 1982 * bridge_transmit: 1983 * 1984 * Do output on a bridge. 1985 * 1986 */ 1987 static int 1988 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 1989 { 1990 struct bridge_softc *sc; 1991 int error = 0; 1992 1993 sc = ifp->if_softc; 1994 1995 ETHER_BPF_MTAP(ifp, m); 1996 1997 1998 BRIDGE_LOCK(sc); 1999 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2000 struct ether_header *eh; 2001 struct ifnet *dst_if; 2002 2003 eh = mtod(m, struct ether_header *); 2004 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 2005 BRIDGE_UNLOCK(sc); 2006 error = bridge_enqueue(sc, dst_if, m); 2007 } else 2008 bridge_broadcast(sc, ifp, m, 0); 2009 2010 return (error); 2011 } 2012 2013 /* 2014 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2015 */ 2016 static void 2017 bridge_qflush(struct ifnet *ifp __unused) 2018 { 2019 } 2020 2021 /* 2022 * bridge_forward: 2023 * 2024 * The forwarding function of the bridge. 2025 * 2026 * NOTE: Releases the lock on return. 2027 */ 2028 static void 2029 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2030 struct mbuf *m) 2031 { 2032 struct bridge_iflist *dbif; 2033 struct ifnet *src_if, *dst_if, *ifp; 2034 struct ether_header *eh; 2035 uint16_t vlan; 2036 uint8_t *dst; 2037 int error; 2038 2039 src_if = m->m_pkthdr.rcvif; 2040 ifp = sc->sc_ifp; 2041 2042 ifp->if_ipackets++; 2043 ifp->if_ibytes += m->m_pkthdr.len; 2044 vlan = VLANTAGOF(m); 2045 2046 if ((sbif->bif_flags & IFBIF_STP) && 2047 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2048 goto drop; 2049 2050 eh = mtod(m, struct ether_header *); 2051 dst = eh->ether_dhost; 2052 2053 /* If the interface is learning, record the address. */ 2054 if (sbif->bif_flags & IFBIF_LEARNING) { 2055 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2056 sbif, 0, IFBAF_DYNAMIC); 2057 /* 2058 * If the interface has addresses limits then deny any source 2059 * that is not in the cache. 2060 */ 2061 if (error && sbif->bif_addrmax) 2062 goto drop; 2063 } 2064 2065 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2066 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2067 goto drop; 2068 2069 /* 2070 * At this point, the port either doesn't participate 2071 * in spanning tree or it is in the forwarding state. 2072 */ 2073 2074 /* 2075 * If the packet is unicast, destined for someone on 2076 * "this" side of the bridge, drop it. 2077 */ 2078 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2079 dst_if = bridge_rtlookup(sc, dst, vlan); 2080 if (src_if == dst_if) 2081 goto drop; 2082 } else { 2083 /* 2084 * Check if its a reserved multicast address, any address 2085 * listed in 802.1D section 7.12.6 may not be forwarded by the 2086 * bridge. 2087 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2088 */ 2089 if (dst[0] == 0x01 && dst[1] == 0x80 && 2090 dst[2] == 0xc2 && dst[3] == 0x00 && 2091 dst[4] == 0x00 && dst[5] <= 0x0f) 2092 goto drop; 2093 2094 /* ...forward it to all interfaces. */ 2095 ifp->if_imcasts++; 2096 dst_if = NULL; 2097 } 2098 2099 /* 2100 * If we have a destination interface which is a member of our bridge, 2101 * OR this is a unicast packet, push it through the bpf(4) machinery. 2102 * For broadcast or multicast packets, don't bother because it will 2103 * be reinjected into ether_input. We do this before we pass the packets 2104 * through the pfil(9) framework, as it is possible that pfil(9) will 2105 * drop the packet, or possibly modify it, making it difficult to debug 2106 * firewall issues on the bridge. 2107 */ 2108 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2109 ETHER_BPF_MTAP(ifp, m); 2110 2111 /* run the packet filter */ 2112 if (PFIL_HOOKED(&V_inet_pfil_hook) 2113 #ifdef INET6 2114 || PFIL_HOOKED(&V_inet6_pfil_hook) 2115 #endif 2116 ) { 2117 BRIDGE_UNLOCK(sc); 2118 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2119 return; 2120 if (m == NULL) 2121 return; 2122 BRIDGE_LOCK(sc); 2123 } 2124 2125 if (dst_if == NULL) { 2126 bridge_broadcast(sc, src_if, m, 1); 2127 return; 2128 } 2129 2130 /* 2131 * At this point, we're dealing with a unicast frame 2132 * going to a different interface. 2133 */ 2134 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2135 goto drop; 2136 2137 dbif = bridge_lookup_member_if(sc, dst_if); 2138 if (dbif == NULL) 2139 /* Not a member of the bridge (anymore?) */ 2140 goto drop; 2141 2142 /* Private segments can not talk to each other */ 2143 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2144 goto drop; 2145 2146 if ((dbif->bif_flags & IFBIF_STP) && 2147 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2148 goto drop; 2149 2150 BRIDGE_UNLOCK(sc); 2151 2152 if (PFIL_HOOKED(&V_inet_pfil_hook) 2153 #ifdef INET6 2154 || PFIL_HOOKED(&V_inet6_pfil_hook) 2155 #endif 2156 ) { 2157 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2158 return; 2159 if (m == NULL) 2160 return; 2161 } 2162 2163 bridge_enqueue(sc, dst_if, m); 2164 return; 2165 2166 drop: 2167 BRIDGE_UNLOCK(sc); 2168 m_freem(m); 2169 } 2170 2171 /* 2172 * bridge_input: 2173 * 2174 * Receive input from a member interface. Queue the packet for 2175 * bridging if it is not for us. 2176 */ 2177 static struct mbuf * 2178 bridge_input(struct ifnet *ifp, struct mbuf *m) 2179 { 2180 struct bridge_softc *sc = ifp->if_bridge; 2181 struct bridge_iflist *bif, *bif2; 2182 struct ifnet *bifp; 2183 struct ether_header *eh; 2184 struct mbuf *mc, *mc2; 2185 uint16_t vlan; 2186 int error; 2187 2188 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2189 return (m); 2190 2191 bifp = sc->sc_ifp; 2192 vlan = VLANTAGOF(m); 2193 2194 /* 2195 * Implement support for bridge monitoring. If this flag has been 2196 * set on this interface, discard the packet once we push it through 2197 * the bpf(4) machinery, but before we do, increment the byte and 2198 * packet counters associated with this interface. 2199 */ 2200 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2201 m->m_pkthdr.rcvif = bifp; 2202 ETHER_BPF_MTAP(bifp, m); 2203 bifp->if_ipackets++; 2204 bifp->if_ibytes += m->m_pkthdr.len; 2205 m_freem(m); 2206 return (NULL); 2207 } 2208 BRIDGE_LOCK(sc); 2209 bif = bridge_lookup_member_if(sc, ifp); 2210 if (bif == NULL) { 2211 BRIDGE_UNLOCK(sc); 2212 return (m); 2213 } 2214 2215 eh = mtod(m, struct ether_header *); 2216 2217 bridge_span(sc, m); 2218 2219 if (m->m_flags & (M_BCAST|M_MCAST)) { 2220 /* Tap off 802.1D packets; they do not get forwarded. */ 2221 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2222 ETHER_ADDR_LEN) == 0) { 2223 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2224 BRIDGE_UNLOCK(sc); 2225 return (NULL); 2226 } 2227 2228 if ((bif->bif_flags & IFBIF_STP) && 2229 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2230 BRIDGE_UNLOCK(sc); 2231 return (m); 2232 } 2233 2234 /* 2235 * Make a deep copy of the packet and enqueue the copy 2236 * for bridge processing; return the original packet for 2237 * local processing. 2238 */ 2239 mc = m_dup(m, M_DONTWAIT); 2240 if (mc == NULL) { 2241 BRIDGE_UNLOCK(sc); 2242 return (m); 2243 } 2244 2245 /* Perform the bridge forwarding function with the copy. */ 2246 bridge_forward(sc, bif, mc); 2247 2248 /* 2249 * Reinject the mbuf as arriving on the bridge so we have a 2250 * chance at claiming multicast packets. We can not loop back 2251 * here from ether_input as a bridge is never a member of a 2252 * bridge. 2253 */ 2254 KASSERT(bifp->if_bridge == NULL, 2255 ("loop created in bridge_input")); 2256 mc2 = m_dup(m, M_DONTWAIT); 2257 if (mc2 != NULL) { 2258 /* Keep the layer3 header aligned */ 2259 int i = min(mc2->m_pkthdr.len, max_protohdr); 2260 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2261 } 2262 if (mc2 != NULL) { 2263 mc2->m_pkthdr.rcvif = bifp; 2264 (*bifp->if_input)(bifp, mc2); 2265 } 2266 2267 /* Return the original packet for local processing. */ 2268 return (m); 2269 } 2270 2271 if ((bif->bif_flags & IFBIF_STP) && 2272 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2273 BRIDGE_UNLOCK(sc); 2274 return (m); 2275 } 2276 2277 #if (defined(INET) || defined(INET6)) 2278 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2279 || ((iface)->if_carp \ 2280 && (*carp_forus_p)((iface), eh->ether_dhost)) 2281 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2282 || ((iface)->if_carp \ 2283 && (*carp_forus_p)((iface), eh->ether_shost)) 2284 #else 2285 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2286 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2287 #endif 2288 2289 #ifdef INET6 2290 # define OR_PFIL_HOOKED_INET6 \ 2291 || PFIL_HOOKED(&V_inet6_pfil_hook) 2292 #else 2293 # define OR_PFIL_HOOKED_INET6 2294 #endif 2295 2296 #define GRAB_OUR_PACKETS(iface) \ 2297 if ((iface)->if_type == IFT_GIF) \ 2298 continue; \ 2299 /* It is destined for us. */ \ 2300 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2301 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2302 ) { \ 2303 if ((iface)->if_type == IFT_BRIDGE) { \ 2304 ETHER_BPF_MTAP(iface, m); \ 2305 iface->if_ipackets++; \ 2306 /* Filter on the physical interface. */ \ 2307 if (pfil_local_phys && \ 2308 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2309 OR_PFIL_HOOKED_INET6)) { \ 2310 if (bridge_pfil(&m, NULL, ifp, \ 2311 PFIL_IN) != 0 || m == NULL) { \ 2312 BRIDGE_UNLOCK(sc); \ 2313 return (NULL); \ 2314 } \ 2315 } \ 2316 } \ 2317 if (bif->bif_flags & IFBIF_LEARNING) { \ 2318 error = bridge_rtupdate(sc, eh->ether_shost, \ 2319 vlan, bif, 0, IFBAF_DYNAMIC); \ 2320 if (error && bif->bif_addrmax) { \ 2321 BRIDGE_UNLOCK(sc); \ 2322 m_freem(m); \ 2323 return (NULL); \ 2324 } \ 2325 } \ 2326 m->m_pkthdr.rcvif = iface; \ 2327 BRIDGE_UNLOCK(sc); \ 2328 return (m); \ 2329 } \ 2330 \ 2331 /* We just received a packet that we sent out. */ \ 2332 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2333 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2334 ) { \ 2335 BRIDGE_UNLOCK(sc); \ 2336 m_freem(m); \ 2337 return (NULL); \ 2338 } 2339 2340 /* 2341 * Unicast. Make sure it's not for the bridge. 2342 */ 2343 do { GRAB_OUR_PACKETS(bifp) } while (0); 2344 2345 /* 2346 * Give a chance for ifp at first priority. This will help when the 2347 * packet comes through the interface like VLAN's with the same MACs 2348 * on several interfaces from the same bridge. This also will save 2349 * some CPU cycles in case the destination interface and the input 2350 * interface (eq ifp) are the same. 2351 */ 2352 do { GRAB_OUR_PACKETS(ifp) } while (0); 2353 2354 /* Now check the all bridge members. */ 2355 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2356 GRAB_OUR_PACKETS(bif2->bif_ifp) 2357 } 2358 2359 #undef OR_CARP_CHECK_WE_ARE_DST 2360 #undef OR_CARP_CHECK_WE_ARE_SRC 2361 #undef OR_PFIL_HOOKED_INET6 2362 #undef GRAB_OUR_PACKETS 2363 2364 /* Perform the bridge forwarding function. */ 2365 bridge_forward(sc, bif, m); 2366 2367 return (NULL); 2368 } 2369 2370 /* 2371 * bridge_broadcast: 2372 * 2373 * Send a frame to all interfaces that are members of 2374 * the bridge, except for the one on which the packet 2375 * arrived. 2376 * 2377 * NOTE: Releases the lock on return. 2378 */ 2379 static void 2380 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2381 struct mbuf *m, int runfilt) 2382 { 2383 struct bridge_iflist *dbif, *sbif; 2384 struct mbuf *mc; 2385 struct ifnet *dst_if; 2386 int error = 0, used = 0, i; 2387 2388 sbif = bridge_lookup_member_if(sc, src_if); 2389 2390 BRIDGE_LOCK2REF(sc, error); 2391 if (error) { 2392 m_freem(m); 2393 return; 2394 } 2395 2396 /* Filter on the bridge interface before broadcasting */ 2397 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2398 #ifdef INET6 2399 || PFIL_HOOKED(&V_inet6_pfil_hook) 2400 #endif 2401 )) { 2402 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2403 goto out; 2404 if (m == NULL) 2405 goto out; 2406 } 2407 2408 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2409 dst_if = dbif->bif_ifp; 2410 if (dst_if == src_if) 2411 continue; 2412 2413 /* Private segments can not talk to each other */ 2414 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2415 continue; 2416 2417 if ((dbif->bif_flags & IFBIF_STP) && 2418 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2419 continue; 2420 2421 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2422 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2423 continue; 2424 2425 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2426 continue; 2427 2428 if (LIST_NEXT(dbif, bif_next) == NULL) { 2429 mc = m; 2430 used = 1; 2431 } else { 2432 mc = m_dup(m, M_DONTWAIT); 2433 if (mc == NULL) { 2434 sc->sc_ifp->if_oerrors++; 2435 continue; 2436 } 2437 } 2438 2439 /* 2440 * Filter on the output interface. Pass a NULL bridge interface 2441 * pointer so we do not redundantly filter on the bridge for 2442 * each interface we broadcast on. 2443 */ 2444 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2445 #ifdef INET6 2446 || PFIL_HOOKED(&V_inet6_pfil_hook) 2447 #endif 2448 )) { 2449 if (used == 0) { 2450 /* Keep the layer3 header aligned */ 2451 i = min(mc->m_pkthdr.len, max_protohdr); 2452 mc = m_copyup(mc, i, ETHER_ALIGN); 2453 if (mc == NULL) { 2454 sc->sc_ifp->if_oerrors++; 2455 continue; 2456 } 2457 } 2458 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2459 continue; 2460 if (mc == NULL) 2461 continue; 2462 } 2463 2464 bridge_enqueue(sc, dst_if, mc); 2465 } 2466 if (used == 0) 2467 m_freem(m); 2468 2469 out: 2470 BRIDGE_UNREF(sc); 2471 } 2472 2473 /* 2474 * bridge_span: 2475 * 2476 * Duplicate a packet out one or more interfaces that are in span mode, 2477 * the original mbuf is unmodified. 2478 */ 2479 static void 2480 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2481 { 2482 struct bridge_iflist *bif; 2483 struct ifnet *dst_if; 2484 struct mbuf *mc; 2485 2486 if (LIST_EMPTY(&sc->sc_spanlist)) 2487 return; 2488 2489 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2490 dst_if = bif->bif_ifp; 2491 2492 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2493 continue; 2494 2495 mc = m_copypacket(m, M_DONTWAIT); 2496 if (mc == NULL) { 2497 sc->sc_ifp->if_oerrors++; 2498 continue; 2499 } 2500 2501 bridge_enqueue(sc, dst_if, mc); 2502 } 2503 } 2504 2505 /* 2506 * bridge_rtupdate: 2507 * 2508 * Add a bridge routing entry. 2509 */ 2510 static int 2511 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2512 struct bridge_iflist *bif, int setflags, uint8_t flags) 2513 { 2514 struct bridge_rtnode *brt; 2515 int error; 2516 2517 BRIDGE_LOCK_ASSERT(sc); 2518 2519 /* Check the source address is valid and not multicast. */ 2520 if (ETHER_IS_MULTICAST(dst) || 2521 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2522 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2523 return (EINVAL); 2524 2525 /* 802.1p frames map to vlan 1 */ 2526 if (vlan == 0) 2527 vlan = 1; 2528 2529 /* 2530 * A route for this destination might already exist. If so, 2531 * update it, otherwise create a new one. 2532 */ 2533 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2534 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2535 sc->sc_brtexceeded++; 2536 return (ENOSPC); 2537 } 2538 /* Check per interface address limits (if enabled) */ 2539 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2540 bif->bif_addrexceeded++; 2541 return (ENOSPC); 2542 } 2543 2544 /* 2545 * Allocate a new bridge forwarding node, and 2546 * initialize the expiration time and Ethernet 2547 * address. 2548 */ 2549 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2550 if (brt == NULL) 2551 return (ENOMEM); 2552 2553 if (bif->bif_flags & IFBIF_STICKY) 2554 brt->brt_flags = IFBAF_STICKY; 2555 else 2556 brt->brt_flags = IFBAF_DYNAMIC; 2557 2558 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2559 brt->brt_vlan = vlan; 2560 2561 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2562 uma_zfree(bridge_rtnode_zone, brt); 2563 return (error); 2564 } 2565 brt->brt_dst = bif; 2566 bif->bif_addrcnt++; 2567 } 2568 2569 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2570 brt->brt_dst != bif) { 2571 brt->brt_dst->bif_addrcnt--; 2572 brt->brt_dst = bif; 2573 brt->brt_dst->bif_addrcnt++; 2574 } 2575 2576 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2577 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2578 if (setflags) 2579 brt->brt_flags = flags; 2580 2581 return (0); 2582 } 2583 2584 /* 2585 * bridge_rtlookup: 2586 * 2587 * Lookup the destination interface for an address. 2588 */ 2589 static struct ifnet * 2590 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2591 { 2592 struct bridge_rtnode *brt; 2593 2594 BRIDGE_LOCK_ASSERT(sc); 2595 2596 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2597 return (NULL); 2598 2599 return (brt->brt_ifp); 2600 } 2601 2602 /* 2603 * bridge_rttrim: 2604 * 2605 * Trim the routine table so that we have a number 2606 * of routing entries less than or equal to the 2607 * maximum number. 2608 */ 2609 static void 2610 bridge_rttrim(struct bridge_softc *sc) 2611 { 2612 struct bridge_rtnode *brt, *nbrt; 2613 2614 BRIDGE_LOCK_ASSERT(sc); 2615 2616 /* Make sure we actually need to do this. */ 2617 if (sc->sc_brtcnt <= sc->sc_brtmax) 2618 return; 2619 2620 /* Force an aging cycle; this might trim enough addresses. */ 2621 bridge_rtage(sc); 2622 if (sc->sc_brtcnt <= sc->sc_brtmax) 2623 return; 2624 2625 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2626 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2627 bridge_rtnode_destroy(sc, brt); 2628 if (sc->sc_brtcnt <= sc->sc_brtmax) 2629 return; 2630 } 2631 } 2632 } 2633 2634 /* 2635 * bridge_timer: 2636 * 2637 * Aging timer for the bridge. 2638 */ 2639 static void 2640 bridge_timer(void *arg) 2641 { 2642 struct bridge_softc *sc = arg; 2643 2644 BRIDGE_LOCK_ASSERT(sc); 2645 2646 bridge_rtage(sc); 2647 2648 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2649 callout_reset(&sc->sc_brcallout, 2650 bridge_rtable_prune_period * hz, bridge_timer, sc); 2651 } 2652 2653 /* 2654 * bridge_rtage: 2655 * 2656 * Perform an aging cycle. 2657 */ 2658 static void 2659 bridge_rtage(struct bridge_softc *sc) 2660 { 2661 struct bridge_rtnode *brt, *nbrt; 2662 2663 BRIDGE_LOCK_ASSERT(sc); 2664 2665 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2666 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2667 if (time_uptime >= brt->brt_expire) 2668 bridge_rtnode_destroy(sc, brt); 2669 } 2670 } 2671 } 2672 2673 /* 2674 * bridge_rtflush: 2675 * 2676 * Remove all dynamic addresses from the bridge. 2677 */ 2678 static void 2679 bridge_rtflush(struct bridge_softc *sc, int full) 2680 { 2681 struct bridge_rtnode *brt, *nbrt; 2682 2683 BRIDGE_LOCK_ASSERT(sc); 2684 2685 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2686 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2687 bridge_rtnode_destroy(sc, brt); 2688 } 2689 } 2690 2691 /* 2692 * bridge_rtdaddr: 2693 * 2694 * Remove an address from the table. 2695 */ 2696 static int 2697 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2698 { 2699 struct bridge_rtnode *brt; 2700 int found = 0; 2701 2702 BRIDGE_LOCK_ASSERT(sc); 2703 2704 /* 2705 * If vlan is zero then we want to delete for all vlans so the lookup 2706 * may return more than one. 2707 */ 2708 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2709 bridge_rtnode_destroy(sc, brt); 2710 found = 1; 2711 } 2712 2713 return (found ? 0 : ENOENT); 2714 } 2715 2716 /* 2717 * bridge_rtdelete: 2718 * 2719 * Delete routes to a speicifc member interface. 2720 */ 2721 static void 2722 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2723 { 2724 struct bridge_rtnode *brt, *nbrt; 2725 2726 BRIDGE_LOCK_ASSERT(sc); 2727 2728 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2729 if (brt->brt_ifp == ifp && (full || 2730 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2731 bridge_rtnode_destroy(sc, brt); 2732 } 2733 } 2734 2735 /* 2736 * bridge_rtable_init: 2737 * 2738 * Initialize the route table for this bridge. 2739 */ 2740 static int 2741 bridge_rtable_init(struct bridge_softc *sc) 2742 { 2743 int i; 2744 2745 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2746 M_DEVBUF, M_NOWAIT); 2747 if (sc->sc_rthash == NULL) 2748 return (ENOMEM); 2749 2750 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2751 LIST_INIT(&sc->sc_rthash[i]); 2752 2753 sc->sc_rthash_key = arc4random(); 2754 2755 LIST_INIT(&sc->sc_rtlist); 2756 2757 return (0); 2758 } 2759 2760 /* 2761 * bridge_rtable_fini: 2762 * 2763 * Deconstruct the route table for this bridge. 2764 */ 2765 static void 2766 bridge_rtable_fini(struct bridge_softc *sc) 2767 { 2768 2769 KASSERT(sc->sc_brtcnt == 0, 2770 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2771 free(sc->sc_rthash, M_DEVBUF); 2772 } 2773 2774 /* 2775 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2776 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2777 */ 2778 #define mix(a, b, c) \ 2779 do { \ 2780 a -= b; a -= c; a ^= (c >> 13); \ 2781 b -= c; b -= a; b ^= (a << 8); \ 2782 c -= a; c -= b; c ^= (b >> 13); \ 2783 a -= b; a -= c; a ^= (c >> 12); \ 2784 b -= c; b -= a; b ^= (a << 16); \ 2785 c -= a; c -= b; c ^= (b >> 5); \ 2786 a -= b; a -= c; a ^= (c >> 3); \ 2787 b -= c; b -= a; b ^= (a << 10); \ 2788 c -= a; c -= b; c ^= (b >> 15); \ 2789 } while (/*CONSTCOND*/0) 2790 2791 static __inline uint32_t 2792 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2793 { 2794 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2795 2796 b += addr[5] << 8; 2797 b += addr[4]; 2798 a += addr[3] << 24; 2799 a += addr[2] << 16; 2800 a += addr[1] << 8; 2801 a += addr[0]; 2802 2803 mix(a, b, c); 2804 2805 return (c & BRIDGE_RTHASH_MASK); 2806 } 2807 2808 #undef mix 2809 2810 static int 2811 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2812 { 2813 int i, d; 2814 2815 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2816 d = ((int)a[i]) - ((int)b[i]); 2817 } 2818 2819 return (d); 2820 } 2821 2822 /* 2823 * bridge_rtnode_lookup: 2824 * 2825 * Look up a bridge route node for the specified destination. Compare the 2826 * vlan id or if zero then just return the first match. 2827 */ 2828 static struct bridge_rtnode * 2829 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2830 { 2831 struct bridge_rtnode *brt; 2832 uint32_t hash; 2833 int dir; 2834 2835 BRIDGE_LOCK_ASSERT(sc); 2836 2837 hash = bridge_rthash(sc, addr); 2838 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2839 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2840 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2841 return (brt); 2842 if (dir > 0) 2843 return (NULL); 2844 } 2845 2846 return (NULL); 2847 } 2848 2849 /* 2850 * bridge_rtnode_insert: 2851 * 2852 * Insert the specified bridge node into the route table. We 2853 * assume the entry is not already in the table. 2854 */ 2855 static int 2856 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2857 { 2858 struct bridge_rtnode *lbrt; 2859 uint32_t hash; 2860 int dir; 2861 2862 BRIDGE_LOCK_ASSERT(sc); 2863 2864 hash = bridge_rthash(sc, brt->brt_addr); 2865 2866 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2867 if (lbrt == NULL) { 2868 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2869 goto out; 2870 } 2871 2872 do { 2873 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2874 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2875 return (EEXIST); 2876 if (dir > 0) { 2877 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2878 goto out; 2879 } 2880 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2881 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2882 goto out; 2883 } 2884 lbrt = LIST_NEXT(lbrt, brt_hash); 2885 } while (lbrt != NULL); 2886 2887 #ifdef DIAGNOSTIC 2888 panic("bridge_rtnode_insert: impossible"); 2889 #endif 2890 2891 out: 2892 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2893 sc->sc_brtcnt++; 2894 2895 return (0); 2896 } 2897 2898 /* 2899 * bridge_rtnode_destroy: 2900 * 2901 * Destroy a bridge rtnode. 2902 */ 2903 static void 2904 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2905 { 2906 BRIDGE_LOCK_ASSERT(sc); 2907 2908 LIST_REMOVE(brt, brt_hash); 2909 2910 LIST_REMOVE(brt, brt_list); 2911 sc->sc_brtcnt--; 2912 brt->brt_dst->bif_addrcnt--; 2913 uma_zfree(bridge_rtnode_zone, brt); 2914 } 2915 2916 /* 2917 * bridge_rtable_expire: 2918 * 2919 * Set the expiry time for all routes on an interface. 2920 */ 2921 static void 2922 bridge_rtable_expire(struct ifnet *ifp, int age) 2923 { 2924 struct bridge_softc *sc = ifp->if_bridge; 2925 struct bridge_rtnode *brt; 2926 2927 BRIDGE_LOCK(sc); 2928 2929 /* 2930 * If the age is zero then flush, otherwise set all the expiry times to 2931 * age for the interface 2932 */ 2933 if (age == 0) 2934 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2935 else { 2936 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2937 /* Cap the expiry time to 'age' */ 2938 if (brt->brt_ifp == ifp && 2939 brt->brt_expire > time_uptime + age && 2940 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2941 brt->brt_expire = time_uptime + age; 2942 } 2943 } 2944 BRIDGE_UNLOCK(sc); 2945 } 2946 2947 /* 2948 * bridge_state_change: 2949 * 2950 * Callback from the bridgestp code when a port changes states. 2951 */ 2952 static void 2953 bridge_state_change(struct ifnet *ifp, int state) 2954 { 2955 struct bridge_softc *sc = ifp->if_bridge; 2956 static const char *stpstates[] = { 2957 "disabled", 2958 "listening", 2959 "learning", 2960 "forwarding", 2961 "blocking", 2962 "discarding" 2963 }; 2964 2965 if (log_stp) 2966 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2967 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2968 } 2969 2970 /* 2971 * Send bridge packets through pfil if they are one of the types pfil can deal 2972 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2973 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2974 * that interface. 2975 */ 2976 static int 2977 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2978 { 2979 int snap, error, i, hlen; 2980 struct ether_header *eh1, eh2; 2981 struct ip *ip; 2982 struct llc llc1; 2983 u_int16_t ether_type; 2984 2985 snap = 0; 2986 error = -1; /* Default error if not error == 0 */ 2987 2988 #if 0 2989 /* we may return with the IP fields swapped, ensure its not shared */ 2990 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2991 #endif 2992 2993 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2994 return (0); /* filtering is disabled */ 2995 2996 i = min((*mp)->m_pkthdr.len, max_protohdr); 2997 if ((*mp)->m_len < i) { 2998 *mp = m_pullup(*mp, i); 2999 if (*mp == NULL) { 3000 printf("%s: m_pullup failed\n", __func__); 3001 return (-1); 3002 } 3003 } 3004 3005 eh1 = mtod(*mp, struct ether_header *); 3006 ether_type = ntohs(eh1->ether_type); 3007 3008 /* 3009 * Check for SNAP/LLC. 3010 */ 3011 if (ether_type < ETHERMTU) { 3012 struct llc *llc2 = (struct llc *)(eh1 + 1); 3013 3014 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3015 llc2->llc_dsap == LLC_SNAP_LSAP && 3016 llc2->llc_ssap == LLC_SNAP_LSAP && 3017 llc2->llc_control == LLC_UI) { 3018 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3019 snap = 1; 3020 } 3021 } 3022 3023 /* 3024 * If we're trying to filter bridge traffic, don't look at anything 3025 * other than IP and ARP traffic. If the filter doesn't understand 3026 * IPv6, don't allow IPv6 through the bridge either. This is lame 3027 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3028 * but of course we don't have an AppleTalk filter to begin with. 3029 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3030 * ARP traffic.) 3031 */ 3032 switch (ether_type) { 3033 case ETHERTYPE_ARP: 3034 case ETHERTYPE_REVARP: 3035 if (pfil_ipfw_arp == 0) 3036 return (0); /* Automatically pass */ 3037 break; 3038 3039 case ETHERTYPE_IP: 3040 #ifdef INET6 3041 case ETHERTYPE_IPV6: 3042 #endif /* INET6 */ 3043 break; 3044 default: 3045 /* 3046 * Check to see if the user wants to pass non-ip 3047 * packets, these will not be checked by pfil(9) and 3048 * passed unconditionally so the default is to drop. 3049 */ 3050 if (pfil_onlyip) 3051 goto bad; 3052 } 3053 3054 /* Run the packet through pfil before stripping link headers */ 3055 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3056 dir == PFIL_OUT && ifp != NULL) { 3057 3058 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3059 3060 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3061 return (error); 3062 } 3063 3064 /* Strip off the Ethernet header and keep a copy. */ 3065 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3066 m_adj(*mp, ETHER_HDR_LEN); 3067 3068 /* Strip off snap header, if present */ 3069 if (snap) { 3070 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3071 m_adj(*mp, sizeof(struct llc)); 3072 } 3073 3074 /* 3075 * Check the IP header for alignment and errors 3076 */ 3077 if (dir == PFIL_IN) { 3078 switch (ether_type) { 3079 case ETHERTYPE_IP: 3080 error = bridge_ip_checkbasic(mp); 3081 break; 3082 #ifdef INET6 3083 case ETHERTYPE_IPV6: 3084 error = bridge_ip6_checkbasic(mp); 3085 break; 3086 #endif /* INET6 */ 3087 default: 3088 error = 0; 3089 } 3090 if (error) 3091 goto bad; 3092 } 3093 3094 error = 0; 3095 3096 /* 3097 * Run the packet through pfil 3098 */ 3099 switch (ether_type) { 3100 case ETHERTYPE_IP: 3101 /* 3102 * before calling the firewall, swap fields the same as 3103 * IP does. here we assume the header is contiguous 3104 */ 3105 ip = mtod(*mp, struct ip *); 3106 3107 ip->ip_len = ntohs(ip->ip_len); 3108 ip->ip_off = ntohs(ip->ip_off); 3109 3110 /* 3111 * Run pfil on the member interface and the bridge, both can 3112 * be skipped by clearing pfil_member or pfil_bridge. 3113 * 3114 * Keep the order: 3115 * in_if -> bridge_if -> out_if 3116 */ 3117 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3118 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3119 dir, NULL); 3120 3121 if (*mp == NULL || error != 0) /* filter may consume */ 3122 break; 3123 3124 if (pfil_member && ifp != NULL) 3125 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3126 dir, NULL); 3127 3128 if (*mp == NULL || error != 0) /* filter may consume */ 3129 break; 3130 3131 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3132 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3133 dir, NULL); 3134 3135 if (*mp == NULL || error != 0) /* filter may consume */ 3136 break; 3137 3138 /* check if we need to fragment the packet */ 3139 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3140 i = (*mp)->m_pkthdr.len; 3141 if (i > ifp->if_mtu) { 3142 error = bridge_fragment(ifp, *mp, &eh2, snap, 3143 &llc1); 3144 return (error); 3145 } 3146 } 3147 3148 /* Recalculate the ip checksum and restore byte ordering */ 3149 ip = mtod(*mp, struct ip *); 3150 hlen = ip->ip_hl << 2; 3151 if (hlen < sizeof(struct ip)) 3152 goto bad; 3153 if (hlen > (*mp)->m_len) { 3154 if ((*mp = m_pullup(*mp, hlen)) == 0) 3155 goto bad; 3156 ip = mtod(*mp, struct ip *); 3157 if (ip == NULL) 3158 goto bad; 3159 } 3160 ip->ip_len = htons(ip->ip_len); 3161 ip->ip_off = htons(ip->ip_off); 3162 ip->ip_sum = 0; 3163 if (hlen == sizeof(struct ip)) 3164 ip->ip_sum = in_cksum_hdr(ip); 3165 else 3166 ip->ip_sum = in_cksum(*mp, hlen); 3167 3168 break; 3169 #ifdef INET6 3170 case ETHERTYPE_IPV6: 3171 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3172 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3173 dir, NULL); 3174 3175 if (*mp == NULL || error != 0) /* filter may consume */ 3176 break; 3177 3178 if (pfil_member && ifp != NULL) 3179 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3180 dir, NULL); 3181 3182 if (*mp == NULL || error != 0) /* filter may consume */ 3183 break; 3184 3185 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3186 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3187 dir, NULL); 3188 break; 3189 #endif 3190 default: 3191 error = 0; 3192 break; 3193 } 3194 3195 if (*mp == NULL) 3196 return (error); 3197 if (error != 0) 3198 goto bad; 3199 3200 error = -1; 3201 3202 /* 3203 * Finally, put everything back the way it was and return 3204 */ 3205 if (snap) { 3206 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3207 if (*mp == NULL) 3208 return (error); 3209 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3210 } 3211 3212 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3213 if (*mp == NULL) 3214 return (error); 3215 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3216 3217 return (0); 3218 3219 bad: 3220 m_freem(*mp); 3221 *mp = NULL; 3222 return (error); 3223 } 3224 3225 /* 3226 * Perform basic checks on header size since 3227 * pfil assumes ip_input has already processed 3228 * it for it. Cut-and-pasted from ip_input.c. 3229 * Given how simple the IPv6 version is, 3230 * does the IPv4 version really need to be 3231 * this complicated? 3232 * 3233 * XXX Should we update ipstat here, or not? 3234 * XXX Right now we update ipstat but not 3235 * XXX csum_counter. 3236 */ 3237 static int 3238 bridge_ip_checkbasic(struct mbuf **mp) 3239 { 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 KMOD_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 KMOD_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 KMOD_IPSTAT_INC(ips_badvers); 3266 goto bad; 3267 } 3268 hlen = ip->ip_hl << 2; 3269 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3270 KMOD_IPSTAT_INC(ips_badhlen); 3271 goto bad; 3272 } 3273 if (hlen > m->m_len) { 3274 if ((m = m_pullup(m, hlen)) == 0) { 3275 KMOD_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 KMOD_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 KMOD_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 KMOD_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 struct mbuf *m = *mp; 3336 struct ip6_hdr *ip6; 3337 3338 /* 3339 * If the IPv6 header is not aligned, slurp it up into a new 3340 * mbuf with space for link headers, in the event we forward 3341 * it. Otherwise, if it is aligned, make sure the entire base 3342 * IPv6 header is in the first mbuf of the chain. 3343 */ 3344 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3345 struct ifnet *inifp = m->m_pkthdr.rcvif; 3346 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3347 (max_linkhdr + 3) & ~3)) == NULL) { 3348 /* XXXJRT new stat, please */ 3349 V_ip6stat.ip6s_toosmall++; 3350 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3351 goto bad; 3352 } 3353 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3354 struct ifnet *inifp = m->m_pkthdr.rcvif; 3355 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3356 V_ip6stat.ip6s_toosmall++; 3357 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3358 goto bad; 3359 } 3360 } 3361 3362 ip6 = mtod(m, struct ip6_hdr *); 3363 3364 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3365 V_ip6stat.ip6s_badvers++; 3366 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3367 goto bad; 3368 } 3369 3370 /* Checks out, proceed */ 3371 *mp = m; 3372 return (0); 3373 3374 bad: 3375 *mp = m; 3376 return (-1); 3377 } 3378 #endif /* INET6 */ 3379 3380 /* 3381 * bridge_fragment: 3382 * 3383 * Return a fragmented mbuf chain. 3384 */ 3385 static int 3386 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3387 int snap, struct llc *llc) 3388 { 3389 struct mbuf *m0; 3390 struct ip *ip; 3391 int error = -1; 3392 3393 if (m->m_len < sizeof(struct ip) && 3394 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3395 goto out; 3396 ip = mtod(m, struct ip *); 3397 3398 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3399 CSUM_DELAY_IP); 3400 if (error) 3401 goto out; 3402 3403 /* walk the chain and re-add the Ethernet header */ 3404 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3405 if (error == 0) { 3406 if (snap) { 3407 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3408 if (m0 == NULL) { 3409 error = ENOBUFS; 3410 continue; 3411 } 3412 bcopy(llc, mtod(m0, caddr_t), 3413 sizeof(struct llc)); 3414 } 3415 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3416 if (m0 == NULL) { 3417 error = ENOBUFS; 3418 continue; 3419 } 3420 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3421 } else 3422 m_freem(m); 3423 } 3424 3425 if (error == 0) 3426 KMOD_IPSTAT_INC(ips_fragmented); 3427 3428 return (error); 3429 3430 out: 3431 if (m != NULL) 3432 m_freem(m); 3433 return (error); 3434 } 3435 3436 static void 3437 bridge_linkstate(struct ifnet *ifp) 3438 { 3439 struct bridge_softc *sc = ifp->if_bridge; 3440 struct bridge_iflist *bif; 3441 3442 BRIDGE_LOCK(sc); 3443 bif = bridge_lookup_member_if(sc, ifp); 3444 if (bif == NULL) { 3445 BRIDGE_UNLOCK(sc); 3446 return; 3447 } 3448 bridge_linkcheck(sc); 3449 BRIDGE_UNLOCK(sc); 3450 3451 bstp_linkstate(&bif->bif_stp); 3452 } 3453 3454 static void 3455 bridge_linkcheck(struct bridge_softc *sc) 3456 { 3457 struct bridge_iflist *bif; 3458 int new_link, hasls; 3459 3460 BRIDGE_LOCK_ASSERT(sc); 3461 new_link = LINK_STATE_DOWN; 3462 hasls = 0; 3463 /* Our link is considered up if at least one of our ports is active */ 3464 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3465 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3466 hasls++; 3467 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3468 new_link = LINK_STATE_UP; 3469 break; 3470 } 3471 } 3472 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3473 /* If no interfaces support link-state then we default to up */ 3474 new_link = LINK_STATE_UP; 3475 } 3476 if_link_state_change(sc->sc_ifp, new_link); 3477 } 3478