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 void 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 /* We may be sending a fragment so traverse the mbuf */ 1787 for (; m; m = m0) { 1788 m0 = m->m_nextpkt; 1789 m->m_nextpkt = NULL; 1790 len = m->m_pkthdr.len; 1791 mflags = m->m_flags; 1792 1793 /* 1794 * If underlying interface can not do VLAN tag insertion itself 1795 * then attach a packet tag that holds it. 1796 */ 1797 if ((m->m_flags & M_VLANTAG) && 1798 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1799 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1800 if (m == NULL) { 1801 if_printf(dst_ifp, 1802 "unable to prepend VLAN header\n"); 1803 dst_ifp->if_oerrors++; 1804 continue; 1805 } 1806 m->m_flags &= ~M_VLANTAG; 1807 } 1808 1809 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1810 m_freem(m0); 1811 sc->sc_ifp->if_oerrors++; 1812 break; 1813 } 1814 1815 sc->sc_ifp->if_opackets++; 1816 sc->sc_ifp->if_obytes += len; 1817 if (mflags & M_MCAST) 1818 sc->sc_ifp->if_omcasts++; 1819 } 1820 1821 return (err); 1822 } 1823 1824 /* 1825 * bridge_dummynet: 1826 * 1827 * Receive a queued packet from dummynet and pass it on to the output 1828 * interface. 1829 * 1830 * The mbuf has the Ethernet header already attached. 1831 */ 1832 static void 1833 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1834 { 1835 struct bridge_softc *sc; 1836 1837 sc = ifp->if_bridge; 1838 1839 /* 1840 * The packet didnt originate from a member interface. This should only 1841 * ever happen if a member interface is removed while packets are 1842 * queued for it. 1843 */ 1844 if (sc == NULL) { 1845 m_freem(m); 1846 return; 1847 } 1848 1849 if (PFIL_HOOKED(&V_inet_pfil_hook) 1850 #ifdef INET6 1851 || PFIL_HOOKED(&V_inet6_pfil_hook) 1852 #endif 1853 ) { 1854 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1855 return; 1856 if (m == NULL) 1857 return; 1858 } 1859 1860 bridge_enqueue(sc, ifp, m); 1861 } 1862 1863 /* 1864 * bridge_output: 1865 * 1866 * Send output from a bridge member interface. This 1867 * performs the bridging function for locally originated 1868 * packets. 1869 * 1870 * The mbuf has the Ethernet header already attached. We must 1871 * enqueue or free the mbuf before returning. 1872 */ 1873 static int 1874 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1875 struct rtentry *rt) 1876 { 1877 struct ether_header *eh; 1878 struct ifnet *dst_if; 1879 struct bridge_softc *sc; 1880 uint16_t vlan; 1881 1882 if (m->m_len < ETHER_HDR_LEN) { 1883 m = m_pullup(m, ETHER_HDR_LEN); 1884 if (m == NULL) 1885 return (0); 1886 } 1887 1888 eh = mtod(m, struct ether_header *); 1889 sc = ifp->if_bridge; 1890 vlan = VLANTAGOF(m); 1891 1892 BRIDGE_LOCK(sc); 1893 1894 /* 1895 * If bridge is down, but the original output interface is up, 1896 * go ahead and send out that interface. Otherwise, the packet 1897 * is dropped below. 1898 */ 1899 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1900 dst_if = ifp; 1901 goto sendunicast; 1902 } 1903 1904 /* 1905 * If the packet is a multicast, or we don't know a better way to 1906 * get there, send to all interfaces. 1907 */ 1908 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1909 dst_if = NULL; 1910 else 1911 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1912 if (dst_if == NULL) { 1913 struct bridge_iflist *bif; 1914 struct mbuf *mc; 1915 int error = 0, used = 0; 1916 1917 bridge_span(sc, m); 1918 1919 BRIDGE_LOCK2REF(sc, error); 1920 if (error) { 1921 m_freem(m); 1922 return (0); 1923 } 1924 1925 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1926 dst_if = bif->bif_ifp; 1927 1928 if (dst_if->if_type == IFT_GIF) 1929 continue; 1930 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1931 continue; 1932 1933 /* 1934 * If this is not the original output interface, 1935 * and the interface is participating in spanning 1936 * tree, make sure the port is in a state that 1937 * allows forwarding. 1938 */ 1939 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1940 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1941 continue; 1942 1943 if (LIST_NEXT(bif, bif_next) == NULL) { 1944 used = 1; 1945 mc = m; 1946 } else { 1947 mc = m_copypacket(m, M_DONTWAIT); 1948 if (mc == NULL) { 1949 sc->sc_ifp->if_oerrors++; 1950 continue; 1951 } 1952 } 1953 1954 bridge_enqueue(sc, dst_if, mc); 1955 } 1956 if (used == 0) 1957 m_freem(m); 1958 BRIDGE_UNREF(sc); 1959 return (0); 1960 } 1961 1962 sendunicast: 1963 /* 1964 * XXX Spanning tree consideration here? 1965 */ 1966 1967 bridge_span(sc, m); 1968 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1969 m_freem(m); 1970 BRIDGE_UNLOCK(sc); 1971 return (0); 1972 } 1973 1974 BRIDGE_UNLOCK(sc); 1975 bridge_enqueue(sc, dst_if, m); 1976 return (0); 1977 } 1978 1979 /* 1980 * bridge_transmit: 1981 * 1982 * Do output on a bridge. 1983 * 1984 */ 1985 static int 1986 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 1987 { 1988 struct bridge_softc *sc; 1989 int error = 0; 1990 1991 sc = ifp->if_softc; 1992 1993 ETHER_BPF_MTAP(ifp, m); 1994 1995 1996 BRIDGE_LOCK(sc); 1997 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1998 struct ether_header *eh; 1999 struct ifnet *dst_if; 2000 2001 eh = mtod(m, struct ether_header *); 2002 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 2003 BRIDGE_UNLOCK(sc); 2004 error = bridge_enqueue(sc, dst_if, m); 2005 } else 2006 bridge_broadcast(sc, ifp, m, 0); 2007 2008 return (error); 2009 } 2010 2011 /* 2012 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2013 */ 2014 static void 2015 bridge_qflush(struct ifnet *ifp __unused) 2016 { 2017 } 2018 2019 /* 2020 * bridge_forward: 2021 * 2022 * The forwarding function of the bridge. 2023 * 2024 * NOTE: Releases the lock on return. 2025 */ 2026 static void 2027 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2028 struct mbuf *m) 2029 { 2030 struct bridge_iflist *dbif; 2031 struct ifnet *src_if, *dst_if, *ifp; 2032 struct ether_header *eh; 2033 uint16_t vlan; 2034 uint8_t *dst; 2035 int error; 2036 2037 src_if = m->m_pkthdr.rcvif; 2038 ifp = sc->sc_ifp; 2039 2040 ifp->if_ipackets++; 2041 ifp->if_ibytes += m->m_pkthdr.len; 2042 vlan = VLANTAGOF(m); 2043 2044 if ((sbif->bif_flags & IFBIF_STP) && 2045 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2046 goto drop; 2047 2048 eh = mtod(m, struct ether_header *); 2049 dst = eh->ether_dhost; 2050 2051 /* If the interface is learning, record the address. */ 2052 if (sbif->bif_flags & IFBIF_LEARNING) { 2053 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2054 sbif, 0, IFBAF_DYNAMIC); 2055 /* 2056 * If the interface has addresses limits then deny any source 2057 * that is not in the cache. 2058 */ 2059 if (error && sbif->bif_addrmax) 2060 goto drop; 2061 } 2062 2063 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2064 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2065 goto drop; 2066 2067 /* 2068 * At this point, the port either doesn't participate 2069 * in spanning tree or it is in the forwarding state. 2070 */ 2071 2072 /* 2073 * If the packet is unicast, destined for someone on 2074 * "this" side of the bridge, drop it. 2075 */ 2076 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2077 dst_if = bridge_rtlookup(sc, dst, vlan); 2078 if (src_if == dst_if) 2079 goto drop; 2080 } else { 2081 /* 2082 * Check if its a reserved multicast address, any address 2083 * listed in 802.1D section 7.12.6 may not be forwarded by the 2084 * bridge. 2085 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2086 */ 2087 if (dst[0] == 0x01 && dst[1] == 0x80 && 2088 dst[2] == 0xc2 && dst[3] == 0x00 && 2089 dst[4] == 0x00 && dst[5] <= 0x0f) 2090 goto drop; 2091 2092 /* ...forward it to all interfaces. */ 2093 ifp->if_imcasts++; 2094 dst_if = NULL; 2095 } 2096 2097 /* 2098 * If we have a destination interface which is a member of our bridge, 2099 * OR this is a unicast packet, push it through the bpf(4) machinery. 2100 * For broadcast or multicast packets, don't bother because it will 2101 * be reinjected into ether_input. We do this before we pass the packets 2102 * through the pfil(9) framework, as it is possible that pfil(9) will 2103 * drop the packet, or possibly modify it, making it difficult to debug 2104 * firewall issues on the bridge. 2105 */ 2106 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2107 ETHER_BPF_MTAP(ifp, m); 2108 2109 /* run the packet filter */ 2110 if (PFIL_HOOKED(&V_inet_pfil_hook) 2111 #ifdef INET6 2112 || PFIL_HOOKED(&V_inet6_pfil_hook) 2113 #endif 2114 ) { 2115 BRIDGE_UNLOCK(sc); 2116 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2117 return; 2118 if (m == NULL) 2119 return; 2120 BRIDGE_LOCK(sc); 2121 } 2122 2123 if (dst_if == NULL) { 2124 bridge_broadcast(sc, src_if, m, 1); 2125 return; 2126 } 2127 2128 /* 2129 * At this point, we're dealing with a unicast frame 2130 * going to a different interface. 2131 */ 2132 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2133 goto drop; 2134 2135 dbif = bridge_lookup_member_if(sc, dst_if); 2136 if (dbif == NULL) 2137 /* Not a member of the bridge (anymore?) */ 2138 goto drop; 2139 2140 /* Private segments can not talk to each other */ 2141 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2142 goto drop; 2143 2144 if ((dbif->bif_flags & IFBIF_STP) && 2145 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2146 goto drop; 2147 2148 BRIDGE_UNLOCK(sc); 2149 2150 if (PFIL_HOOKED(&V_inet_pfil_hook) 2151 #ifdef INET6 2152 || PFIL_HOOKED(&V_inet6_pfil_hook) 2153 #endif 2154 ) { 2155 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2156 return; 2157 if (m == NULL) 2158 return; 2159 } 2160 2161 bridge_enqueue(sc, dst_if, m); 2162 return; 2163 2164 drop: 2165 BRIDGE_UNLOCK(sc); 2166 m_freem(m); 2167 } 2168 2169 /* 2170 * bridge_input: 2171 * 2172 * Receive input from a member interface. Queue the packet for 2173 * bridging if it is not for us. 2174 */ 2175 static struct mbuf * 2176 bridge_input(struct ifnet *ifp, struct mbuf *m) 2177 { 2178 struct bridge_softc *sc = ifp->if_bridge; 2179 struct bridge_iflist *bif, *bif2; 2180 struct ifnet *bifp; 2181 struct ether_header *eh; 2182 struct mbuf *mc, *mc2; 2183 uint16_t vlan; 2184 int error; 2185 2186 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2187 return (m); 2188 2189 bifp = sc->sc_ifp; 2190 vlan = VLANTAGOF(m); 2191 2192 /* 2193 * Implement support for bridge monitoring. If this flag has been 2194 * set on this interface, discard the packet once we push it through 2195 * the bpf(4) machinery, but before we do, increment the byte and 2196 * packet counters associated with this interface. 2197 */ 2198 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2199 m->m_pkthdr.rcvif = bifp; 2200 ETHER_BPF_MTAP(bifp, m); 2201 bifp->if_ipackets++; 2202 bifp->if_ibytes += m->m_pkthdr.len; 2203 m_freem(m); 2204 return (NULL); 2205 } 2206 BRIDGE_LOCK(sc); 2207 bif = bridge_lookup_member_if(sc, ifp); 2208 if (bif == NULL) { 2209 BRIDGE_UNLOCK(sc); 2210 return (m); 2211 } 2212 2213 eh = mtod(m, struct ether_header *); 2214 2215 bridge_span(sc, m); 2216 2217 if (m->m_flags & (M_BCAST|M_MCAST)) { 2218 /* Tap off 802.1D packets; they do not get forwarded. */ 2219 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2220 ETHER_ADDR_LEN) == 0) { 2221 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2222 BRIDGE_UNLOCK(sc); 2223 return (NULL); 2224 } 2225 2226 if ((bif->bif_flags & IFBIF_STP) && 2227 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2228 BRIDGE_UNLOCK(sc); 2229 return (m); 2230 } 2231 2232 /* 2233 * Make a deep copy of the packet and enqueue the copy 2234 * for bridge processing; return the original packet for 2235 * local processing. 2236 */ 2237 mc = m_dup(m, M_DONTWAIT); 2238 if (mc == NULL) { 2239 BRIDGE_UNLOCK(sc); 2240 return (m); 2241 } 2242 2243 /* Perform the bridge forwarding function with the copy. */ 2244 bridge_forward(sc, bif, mc); 2245 2246 /* 2247 * Reinject the mbuf as arriving on the bridge so we have a 2248 * chance at claiming multicast packets. We can not loop back 2249 * here from ether_input as a bridge is never a member of a 2250 * bridge. 2251 */ 2252 KASSERT(bifp->if_bridge == NULL, 2253 ("loop created in bridge_input")); 2254 mc2 = m_dup(m, M_DONTWAIT); 2255 if (mc2 != NULL) { 2256 /* Keep the layer3 header aligned */ 2257 int i = min(mc2->m_pkthdr.len, max_protohdr); 2258 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2259 } 2260 if (mc2 != NULL) { 2261 mc2->m_pkthdr.rcvif = bifp; 2262 (*bifp->if_input)(bifp, mc2); 2263 } 2264 2265 /* Return the original packet for local processing. */ 2266 return (m); 2267 } 2268 2269 if ((bif->bif_flags & IFBIF_STP) && 2270 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2271 BRIDGE_UNLOCK(sc); 2272 return (m); 2273 } 2274 2275 #if (defined(INET) || defined(INET6)) 2276 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2277 || ((iface)->if_carp \ 2278 && (*carp_forus_p)((iface), eh->ether_dhost)) 2279 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2280 || ((iface)->if_carp \ 2281 && (*carp_forus_p)((iface), eh->ether_shost)) 2282 #else 2283 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2284 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2285 #endif 2286 2287 #ifdef INET6 2288 # define OR_PFIL_HOOKED_INET6 \ 2289 || PFIL_HOOKED(&V_inet6_pfil_hook) 2290 #else 2291 # define OR_PFIL_HOOKED_INET6 2292 #endif 2293 2294 #define GRAB_OUR_PACKETS(iface) \ 2295 if ((iface)->if_type == IFT_GIF) \ 2296 continue; \ 2297 /* It is destined for us. */ \ 2298 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2299 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2300 ) { \ 2301 if ((iface)->if_type == IFT_BRIDGE) { \ 2302 ETHER_BPF_MTAP(iface, m); \ 2303 iface->if_ipackets++; \ 2304 iface->if_ibytes += m->m_pkthdr.len; \ 2305 /* Filter on the physical interface. */ \ 2306 if (pfil_local_phys && \ 2307 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2308 OR_PFIL_HOOKED_INET6)) { \ 2309 if (bridge_pfil(&m, NULL, ifp, \ 2310 PFIL_IN) != 0 || m == NULL) { \ 2311 BRIDGE_UNLOCK(sc); \ 2312 return (NULL); \ 2313 } \ 2314 } \ 2315 } \ 2316 if (bif->bif_flags & IFBIF_LEARNING) { \ 2317 error = bridge_rtupdate(sc, eh->ether_shost, \ 2318 vlan, bif, 0, IFBAF_DYNAMIC); \ 2319 if (error && bif->bif_addrmax) { \ 2320 BRIDGE_UNLOCK(sc); \ 2321 m_freem(m); \ 2322 return (NULL); \ 2323 } \ 2324 } \ 2325 m->m_pkthdr.rcvif = iface; \ 2326 BRIDGE_UNLOCK(sc); \ 2327 return (m); \ 2328 } \ 2329 \ 2330 /* We just received a packet that we sent out. */ \ 2331 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2332 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2333 ) { \ 2334 BRIDGE_UNLOCK(sc); \ 2335 m_freem(m); \ 2336 return (NULL); \ 2337 } 2338 2339 /* 2340 * Unicast. Make sure it's not for the bridge. 2341 */ 2342 do { GRAB_OUR_PACKETS(bifp) } while (0); 2343 2344 /* 2345 * Give a chance for ifp at first priority. This will help when the 2346 * packet comes through the interface like VLAN's with the same MACs 2347 * on several interfaces from the same bridge. This also will save 2348 * some CPU cycles in case the destination interface and the input 2349 * interface (eq ifp) are the same. 2350 */ 2351 do { GRAB_OUR_PACKETS(ifp) } while (0); 2352 2353 /* Now check the all bridge members. */ 2354 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2355 GRAB_OUR_PACKETS(bif2->bif_ifp) 2356 } 2357 2358 #undef OR_CARP_CHECK_WE_ARE_DST 2359 #undef OR_CARP_CHECK_WE_ARE_SRC 2360 #undef OR_PFIL_HOOKED_INET6 2361 #undef GRAB_OUR_PACKETS 2362 2363 /* Perform the bridge forwarding function. */ 2364 bridge_forward(sc, bif, m); 2365 2366 return (NULL); 2367 } 2368 2369 /* 2370 * bridge_broadcast: 2371 * 2372 * Send a frame to all interfaces that are members of 2373 * the bridge, except for the one on which the packet 2374 * arrived. 2375 * 2376 * NOTE: Releases the lock on return. 2377 */ 2378 static void 2379 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2380 struct mbuf *m, int runfilt) 2381 { 2382 struct bridge_iflist *dbif, *sbif; 2383 struct mbuf *mc; 2384 struct ifnet *dst_if; 2385 int error = 0, used = 0, i; 2386 2387 sbif = bridge_lookup_member_if(sc, src_if); 2388 2389 BRIDGE_LOCK2REF(sc, error); 2390 if (error) { 2391 m_freem(m); 2392 return; 2393 } 2394 2395 /* Filter on the bridge interface before broadcasting */ 2396 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2397 #ifdef INET6 2398 || PFIL_HOOKED(&V_inet6_pfil_hook) 2399 #endif 2400 )) { 2401 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2402 goto out; 2403 if (m == NULL) 2404 goto out; 2405 } 2406 2407 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2408 dst_if = dbif->bif_ifp; 2409 if (dst_if == src_if) 2410 continue; 2411 2412 /* Private segments can not talk to each other */ 2413 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2414 continue; 2415 2416 if ((dbif->bif_flags & IFBIF_STP) && 2417 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2418 continue; 2419 2420 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2421 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2422 continue; 2423 2424 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2425 continue; 2426 2427 if (LIST_NEXT(dbif, bif_next) == NULL) { 2428 mc = m; 2429 used = 1; 2430 } else { 2431 mc = m_dup(m, M_DONTWAIT); 2432 if (mc == NULL) { 2433 sc->sc_ifp->if_oerrors++; 2434 continue; 2435 } 2436 } 2437 2438 /* 2439 * Filter on the output interface. Pass a NULL bridge interface 2440 * pointer so we do not redundantly filter on the bridge for 2441 * each interface we broadcast on. 2442 */ 2443 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2444 #ifdef INET6 2445 || PFIL_HOOKED(&V_inet6_pfil_hook) 2446 #endif 2447 )) { 2448 if (used == 0) { 2449 /* Keep the layer3 header aligned */ 2450 i = min(mc->m_pkthdr.len, max_protohdr); 2451 mc = m_copyup(mc, i, ETHER_ALIGN); 2452 if (mc == NULL) { 2453 sc->sc_ifp->if_oerrors++; 2454 continue; 2455 } 2456 } 2457 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2458 continue; 2459 if (mc == NULL) 2460 continue; 2461 } 2462 2463 bridge_enqueue(sc, dst_if, mc); 2464 } 2465 if (used == 0) 2466 m_freem(m); 2467 2468 out: 2469 BRIDGE_UNREF(sc); 2470 } 2471 2472 /* 2473 * bridge_span: 2474 * 2475 * Duplicate a packet out one or more interfaces that are in span mode, 2476 * the original mbuf is unmodified. 2477 */ 2478 static void 2479 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2480 { 2481 struct bridge_iflist *bif; 2482 struct ifnet *dst_if; 2483 struct mbuf *mc; 2484 2485 if (LIST_EMPTY(&sc->sc_spanlist)) 2486 return; 2487 2488 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2489 dst_if = bif->bif_ifp; 2490 2491 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2492 continue; 2493 2494 mc = m_copypacket(m, M_DONTWAIT); 2495 if (mc == NULL) { 2496 sc->sc_ifp->if_oerrors++; 2497 continue; 2498 } 2499 2500 bridge_enqueue(sc, dst_if, mc); 2501 } 2502 } 2503 2504 /* 2505 * bridge_rtupdate: 2506 * 2507 * Add a bridge routing entry. 2508 */ 2509 static int 2510 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2511 struct bridge_iflist *bif, int setflags, uint8_t flags) 2512 { 2513 struct bridge_rtnode *brt; 2514 int error; 2515 2516 BRIDGE_LOCK_ASSERT(sc); 2517 2518 /* Check the source address is valid and not multicast. */ 2519 if (ETHER_IS_MULTICAST(dst) || 2520 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2521 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2522 return (EINVAL); 2523 2524 /* 802.1p frames map to vlan 1 */ 2525 if (vlan == 0) 2526 vlan = 1; 2527 2528 /* 2529 * A route for this destination might already exist. If so, 2530 * update it, otherwise create a new one. 2531 */ 2532 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2533 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2534 sc->sc_brtexceeded++; 2535 return (ENOSPC); 2536 } 2537 /* Check per interface address limits (if enabled) */ 2538 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2539 bif->bif_addrexceeded++; 2540 return (ENOSPC); 2541 } 2542 2543 /* 2544 * Allocate a new bridge forwarding node, and 2545 * initialize the expiration time and Ethernet 2546 * address. 2547 */ 2548 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2549 if (brt == NULL) 2550 return (ENOMEM); 2551 2552 if (bif->bif_flags & IFBIF_STICKY) 2553 brt->brt_flags = IFBAF_STICKY; 2554 else 2555 brt->brt_flags = IFBAF_DYNAMIC; 2556 2557 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2558 brt->brt_vlan = vlan; 2559 2560 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2561 uma_zfree(bridge_rtnode_zone, brt); 2562 return (error); 2563 } 2564 brt->brt_dst = bif; 2565 bif->bif_addrcnt++; 2566 } 2567 2568 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2569 brt->brt_dst != bif) { 2570 brt->brt_dst->bif_addrcnt--; 2571 brt->brt_dst = bif; 2572 brt->brt_dst->bif_addrcnt++; 2573 } 2574 2575 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2576 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2577 if (setflags) 2578 brt->brt_flags = flags; 2579 2580 return (0); 2581 } 2582 2583 /* 2584 * bridge_rtlookup: 2585 * 2586 * Lookup the destination interface for an address. 2587 */ 2588 static struct ifnet * 2589 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2590 { 2591 struct bridge_rtnode *brt; 2592 2593 BRIDGE_LOCK_ASSERT(sc); 2594 2595 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2596 return (NULL); 2597 2598 return (brt->brt_ifp); 2599 } 2600 2601 /* 2602 * bridge_rttrim: 2603 * 2604 * Trim the routine table so that we have a number 2605 * of routing entries less than or equal to the 2606 * maximum number. 2607 */ 2608 static void 2609 bridge_rttrim(struct bridge_softc *sc) 2610 { 2611 struct bridge_rtnode *brt, *nbrt; 2612 2613 BRIDGE_LOCK_ASSERT(sc); 2614 2615 /* Make sure we actually need to do this. */ 2616 if (sc->sc_brtcnt <= sc->sc_brtmax) 2617 return; 2618 2619 /* Force an aging cycle; this might trim enough addresses. */ 2620 bridge_rtage(sc); 2621 if (sc->sc_brtcnt <= sc->sc_brtmax) 2622 return; 2623 2624 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2625 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2626 bridge_rtnode_destroy(sc, brt); 2627 if (sc->sc_brtcnt <= sc->sc_brtmax) 2628 return; 2629 } 2630 } 2631 } 2632 2633 /* 2634 * bridge_timer: 2635 * 2636 * Aging timer for the bridge. 2637 */ 2638 static void 2639 bridge_timer(void *arg) 2640 { 2641 struct bridge_softc *sc = arg; 2642 2643 BRIDGE_LOCK_ASSERT(sc); 2644 2645 bridge_rtage(sc); 2646 2647 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2648 callout_reset(&sc->sc_brcallout, 2649 bridge_rtable_prune_period * hz, bridge_timer, sc); 2650 } 2651 2652 /* 2653 * bridge_rtage: 2654 * 2655 * Perform an aging cycle. 2656 */ 2657 static void 2658 bridge_rtage(struct bridge_softc *sc) 2659 { 2660 struct bridge_rtnode *brt, *nbrt; 2661 2662 BRIDGE_LOCK_ASSERT(sc); 2663 2664 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2665 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2666 if (time_uptime >= brt->brt_expire) 2667 bridge_rtnode_destroy(sc, brt); 2668 } 2669 } 2670 } 2671 2672 /* 2673 * bridge_rtflush: 2674 * 2675 * Remove all dynamic addresses from the bridge. 2676 */ 2677 static void 2678 bridge_rtflush(struct bridge_softc *sc, int full) 2679 { 2680 struct bridge_rtnode *brt, *nbrt; 2681 2682 BRIDGE_LOCK_ASSERT(sc); 2683 2684 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2685 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2686 bridge_rtnode_destroy(sc, brt); 2687 } 2688 } 2689 2690 /* 2691 * bridge_rtdaddr: 2692 * 2693 * Remove an address from the table. 2694 */ 2695 static int 2696 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2697 { 2698 struct bridge_rtnode *brt; 2699 int found = 0; 2700 2701 BRIDGE_LOCK_ASSERT(sc); 2702 2703 /* 2704 * If vlan is zero then we want to delete for all vlans so the lookup 2705 * may return more than one. 2706 */ 2707 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2708 bridge_rtnode_destroy(sc, brt); 2709 found = 1; 2710 } 2711 2712 return (found ? 0 : ENOENT); 2713 } 2714 2715 /* 2716 * bridge_rtdelete: 2717 * 2718 * Delete routes to a speicifc member interface. 2719 */ 2720 static void 2721 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2722 { 2723 struct bridge_rtnode *brt, *nbrt; 2724 2725 BRIDGE_LOCK_ASSERT(sc); 2726 2727 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2728 if (brt->brt_ifp == ifp && (full || 2729 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2730 bridge_rtnode_destroy(sc, brt); 2731 } 2732 } 2733 2734 /* 2735 * bridge_rtable_init: 2736 * 2737 * Initialize the route table for this bridge. 2738 */ 2739 static void 2740 bridge_rtable_init(struct bridge_softc *sc) 2741 { 2742 int i; 2743 2744 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2745 M_DEVBUF, M_WAITOK); 2746 2747 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2748 LIST_INIT(&sc->sc_rthash[i]); 2749 2750 sc->sc_rthash_key = arc4random(); 2751 LIST_INIT(&sc->sc_rtlist); 2752 } 2753 2754 /* 2755 * bridge_rtable_fini: 2756 * 2757 * Deconstruct the route table for this bridge. 2758 */ 2759 static void 2760 bridge_rtable_fini(struct bridge_softc *sc) 2761 { 2762 2763 KASSERT(sc->sc_brtcnt == 0, 2764 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2765 free(sc->sc_rthash, M_DEVBUF); 2766 } 2767 2768 /* 2769 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2770 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2771 */ 2772 #define mix(a, b, c) \ 2773 do { \ 2774 a -= b; a -= c; a ^= (c >> 13); \ 2775 b -= c; b -= a; b ^= (a << 8); \ 2776 c -= a; c -= b; c ^= (b >> 13); \ 2777 a -= b; a -= c; a ^= (c >> 12); \ 2778 b -= c; b -= a; b ^= (a << 16); \ 2779 c -= a; c -= b; c ^= (b >> 5); \ 2780 a -= b; a -= c; a ^= (c >> 3); \ 2781 b -= c; b -= a; b ^= (a << 10); \ 2782 c -= a; c -= b; c ^= (b >> 15); \ 2783 } while (/*CONSTCOND*/0) 2784 2785 static __inline uint32_t 2786 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2787 { 2788 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2789 2790 b += addr[5] << 8; 2791 b += addr[4]; 2792 a += addr[3] << 24; 2793 a += addr[2] << 16; 2794 a += addr[1] << 8; 2795 a += addr[0]; 2796 2797 mix(a, b, c); 2798 2799 return (c & BRIDGE_RTHASH_MASK); 2800 } 2801 2802 #undef mix 2803 2804 static int 2805 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2806 { 2807 int i, d; 2808 2809 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2810 d = ((int)a[i]) - ((int)b[i]); 2811 } 2812 2813 return (d); 2814 } 2815 2816 /* 2817 * bridge_rtnode_lookup: 2818 * 2819 * Look up a bridge route node for the specified destination. Compare the 2820 * vlan id or if zero then just return the first match. 2821 */ 2822 static struct bridge_rtnode * 2823 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2824 { 2825 struct bridge_rtnode *brt; 2826 uint32_t hash; 2827 int dir; 2828 2829 BRIDGE_LOCK_ASSERT(sc); 2830 2831 hash = bridge_rthash(sc, addr); 2832 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2833 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2834 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2835 return (brt); 2836 if (dir > 0) 2837 return (NULL); 2838 } 2839 2840 return (NULL); 2841 } 2842 2843 /* 2844 * bridge_rtnode_insert: 2845 * 2846 * Insert the specified bridge node into the route table. We 2847 * assume the entry is not already in the table. 2848 */ 2849 static int 2850 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2851 { 2852 struct bridge_rtnode *lbrt; 2853 uint32_t hash; 2854 int dir; 2855 2856 BRIDGE_LOCK_ASSERT(sc); 2857 2858 hash = bridge_rthash(sc, brt->brt_addr); 2859 2860 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2861 if (lbrt == NULL) { 2862 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2863 goto out; 2864 } 2865 2866 do { 2867 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2868 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2869 return (EEXIST); 2870 if (dir > 0) { 2871 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2872 goto out; 2873 } 2874 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2875 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2876 goto out; 2877 } 2878 lbrt = LIST_NEXT(lbrt, brt_hash); 2879 } while (lbrt != NULL); 2880 2881 #ifdef DIAGNOSTIC 2882 panic("bridge_rtnode_insert: impossible"); 2883 #endif 2884 2885 out: 2886 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2887 sc->sc_brtcnt++; 2888 2889 return (0); 2890 } 2891 2892 /* 2893 * bridge_rtnode_destroy: 2894 * 2895 * Destroy a bridge rtnode. 2896 */ 2897 static void 2898 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2899 { 2900 BRIDGE_LOCK_ASSERT(sc); 2901 2902 LIST_REMOVE(brt, brt_hash); 2903 2904 LIST_REMOVE(brt, brt_list); 2905 sc->sc_brtcnt--; 2906 brt->brt_dst->bif_addrcnt--; 2907 uma_zfree(bridge_rtnode_zone, brt); 2908 } 2909 2910 /* 2911 * bridge_rtable_expire: 2912 * 2913 * Set the expiry time for all routes on an interface. 2914 */ 2915 static void 2916 bridge_rtable_expire(struct ifnet *ifp, int age) 2917 { 2918 struct bridge_softc *sc = ifp->if_bridge; 2919 struct bridge_rtnode *brt; 2920 2921 BRIDGE_LOCK(sc); 2922 2923 /* 2924 * If the age is zero then flush, otherwise set all the expiry times to 2925 * age for the interface 2926 */ 2927 if (age == 0) 2928 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2929 else { 2930 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2931 /* Cap the expiry time to 'age' */ 2932 if (brt->brt_ifp == ifp && 2933 brt->brt_expire > time_uptime + age && 2934 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2935 brt->brt_expire = time_uptime + age; 2936 } 2937 } 2938 BRIDGE_UNLOCK(sc); 2939 } 2940 2941 /* 2942 * bridge_state_change: 2943 * 2944 * Callback from the bridgestp code when a port changes states. 2945 */ 2946 static void 2947 bridge_state_change(struct ifnet *ifp, int state) 2948 { 2949 struct bridge_softc *sc = ifp->if_bridge; 2950 static const char *stpstates[] = { 2951 "disabled", 2952 "listening", 2953 "learning", 2954 "forwarding", 2955 "blocking", 2956 "discarding" 2957 }; 2958 2959 if (log_stp) 2960 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2961 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2962 } 2963 2964 /* 2965 * Send bridge packets through pfil if they are one of the types pfil can deal 2966 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2967 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2968 * that interface. 2969 */ 2970 static int 2971 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2972 { 2973 int snap, error, i, hlen; 2974 struct ether_header *eh1, eh2; 2975 struct ip *ip; 2976 struct llc llc1; 2977 u_int16_t ether_type; 2978 2979 snap = 0; 2980 error = -1; /* Default error if not error == 0 */ 2981 2982 #if 0 2983 /* we may return with the IP fields swapped, ensure its not shared */ 2984 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2985 #endif 2986 2987 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2988 return (0); /* filtering is disabled */ 2989 2990 i = min((*mp)->m_pkthdr.len, max_protohdr); 2991 if ((*mp)->m_len < i) { 2992 *mp = m_pullup(*mp, i); 2993 if (*mp == NULL) { 2994 printf("%s: m_pullup failed\n", __func__); 2995 return (-1); 2996 } 2997 } 2998 2999 eh1 = mtod(*mp, struct ether_header *); 3000 ether_type = ntohs(eh1->ether_type); 3001 3002 /* 3003 * Check for SNAP/LLC. 3004 */ 3005 if (ether_type < ETHERMTU) { 3006 struct llc *llc2 = (struct llc *)(eh1 + 1); 3007 3008 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3009 llc2->llc_dsap == LLC_SNAP_LSAP && 3010 llc2->llc_ssap == LLC_SNAP_LSAP && 3011 llc2->llc_control == LLC_UI) { 3012 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3013 snap = 1; 3014 } 3015 } 3016 3017 /* 3018 * If we're trying to filter bridge traffic, don't look at anything 3019 * other than IP and ARP traffic. If the filter doesn't understand 3020 * IPv6, don't allow IPv6 through the bridge either. This is lame 3021 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3022 * but of course we don't have an AppleTalk filter to begin with. 3023 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3024 * ARP traffic.) 3025 */ 3026 switch (ether_type) { 3027 case ETHERTYPE_ARP: 3028 case ETHERTYPE_REVARP: 3029 if (pfil_ipfw_arp == 0) 3030 return (0); /* Automatically pass */ 3031 break; 3032 3033 case ETHERTYPE_IP: 3034 #ifdef INET6 3035 case ETHERTYPE_IPV6: 3036 #endif /* INET6 */ 3037 break; 3038 default: 3039 /* 3040 * Check to see if the user wants to pass non-ip 3041 * packets, these will not be checked by pfil(9) and 3042 * passed unconditionally so the default is to drop. 3043 */ 3044 if (pfil_onlyip) 3045 goto bad; 3046 } 3047 3048 /* Run the packet through pfil before stripping link headers */ 3049 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3050 dir == PFIL_OUT && ifp != NULL) { 3051 3052 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3053 3054 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3055 return (error); 3056 } 3057 3058 /* Strip off the Ethernet header and keep a copy. */ 3059 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3060 m_adj(*mp, ETHER_HDR_LEN); 3061 3062 /* Strip off snap header, if present */ 3063 if (snap) { 3064 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3065 m_adj(*mp, sizeof(struct llc)); 3066 } 3067 3068 /* 3069 * Check the IP header for alignment and errors 3070 */ 3071 if (dir == PFIL_IN) { 3072 switch (ether_type) { 3073 case ETHERTYPE_IP: 3074 error = bridge_ip_checkbasic(mp); 3075 break; 3076 #ifdef INET6 3077 case ETHERTYPE_IPV6: 3078 error = bridge_ip6_checkbasic(mp); 3079 break; 3080 #endif /* INET6 */ 3081 default: 3082 error = 0; 3083 } 3084 if (error) 3085 goto bad; 3086 } 3087 3088 error = 0; 3089 3090 /* 3091 * Run the packet through pfil 3092 */ 3093 switch (ether_type) { 3094 case ETHERTYPE_IP: 3095 /* 3096 * Run pfil on the member interface and the bridge, both can 3097 * be skipped by clearing pfil_member or pfil_bridge. 3098 * 3099 * Keep the order: 3100 * in_if -> bridge_if -> out_if 3101 */ 3102 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3103 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3104 dir, NULL); 3105 3106 if (*mp == NULL || error != 0) /* filter may consume */ 3107 break; 3108 3109 if (pfil_member && ifp != NULL) 3110 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3111 dir, NULL); 3112 3113 if (*mp == NULL || error != 0) /* filter may consume */ 3114 break; 3115 3116 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3117 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3118 dir, NULL); 3119 3120 if (*mp == NULL || error != 0) /* filter may consume */ 3121 break; 3122 3123 /* check if we need to fragment the packet */ 3124 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3125 i = (*mp)->m_pkthdr.len; 3126 if (i > ifp->if_mtu) { 3127 error = bridge_fragment(ifp, *mp, &eh2, snap, 3128 &llc1); 3129 return (error); 3130 } 3131 } 3132 3133 /* Recalculate the ip checksum. */ 3134 ip = mtod(*mp, struct ip *); 3135 hlen = ip->ip_hl << 2; 3136 if (hlen < sizeof(struct ip)) 3137 goto bad; 3138 if (hlen > (*mp)->m_len) { 3139 if ((*mp = m_pullup(*mp, hlen)) == 0) 3140 goto bad; 3141 ip = mtod(*mp, struct ip *); 3142 if (ip == NULL) 3143 goto bad; 3144 } 3145 ip->ip_sum = 0; 3146 if (hlen == sizeof(struct ip)) 3147 ip->ip_sum = in_cksum_hdr(ip); 3148 else 3149 ip->ip_sum = in_cksum(*mp, hlen); 3150 3151 break; 3152 #ifdef INET6 3153 case ETHERTYPE_IPV6: 3154 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3155 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3156 dir, NULL); 3157 3158 if (*mp == NULL || error != 0) /* filter may consume */ 3159 break; 3160 3161 if (pfil_member && ifp != NULL) 3162 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3163 dir, NULL); 3164 3165 if (*mp == NULL || error != 0) /* filter may consume */ 3166 break; 3167 3168 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3169 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3170 dir, NULL); 3171 break; 3172 #endif 3173 default: 3174 error = 0; 3175 break; 3176 } 3177 3178 if (*mp == NULL) 3179 return (error); 3180 if (error != 0) 3181 goto bad; 3182 3183 error = -1; 3184 3185 /* 3186 * Finally, put everything back the way it was and return 3187 */ 3188 if (snap) { 3189 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3190 if (*mp == NULL) 3191 return (error); 3192 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3193 } 3194 3195 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3196 if (*mp == NULL) 3197 return (error); 3198 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3199 3200 return (0); 3201 3202 bad: 3203 m_freem(*mp); 3204 *mp = NULL; 3205 return (error); 3206 } 3207 3208 /* 3209 * Perform basic checks on header size since 3210 * pfil assumes ip_input has already processed 3211 * it for it. Cut-and-pasted from ip_input.c. 3212 * Given how simple the IPv6 version is, 3213 * does the IPv4 version really need to be 3214 * this complicated? 3215 * 3216 * XXX Should we update ipstat here, or not? 3217 * XXX Right now we update ipstat but not 3218 * XXX csum_counter. 3219 */ 3220 static int 3221 bridge_ip_checkbasic(struct mbuf **mp) 3222 { 3223 struct mbuf *m = *mp; 3224 struct ip *ip; 3225 int len, hlen; 3226 u_short sum; 3227 3228 if (*mp == NULL) 3229 return (-1); 3230 3231 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3232 if ((m = m_copyup(m, sizeof(struct ip), 3233 (max_linkhdr + 3) & ~3)) == NULL) { 3234 /* XXXJRT new stat, please */ 3235 KMOD_IPSTAT_INC(ips_toosmall); 3236 goto bad; 3237 } 3238 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3239 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3240 KMOD_IPSTAT_INC(ips_toosmall); 3241 goto bad; 3242 } 3243 } 3244 ip = mtod(m, struct ip *); 3245 if (ip == NULL) goto bad; 3246 3247 if (ip->ip_v != IPVERSION) { 3248 KMOD_IPSTAT_INC(ips_badvers); 3249 goto bad; 3250 } 3251 hlen = ip->ip_hl << 2; 3252 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3253 KMOD_IPSTAT_INC(ips_badhlen); 3254 goto bad; 3255 } 3256 if (hlen > m->m_len) { 3257 if ((m = m_pullup(m, hlen)) == 0) { 3258 KMOD_IPSTAT_INC(ips_badhlen); 3259 goto bad; 3260 } 3261 ip = mtod(m, struct ip *); 3262 if (ip == NULL) goto bad; 3263 } 3264 3265 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3266 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3267 } else { 3268 if (hlen == sizeof(struct ip)) { 3269 sum = in_cksum_hdr(ip); 3270 } else { 3271 sum = in_cksum(m, hlen); 3272 } 3273 } 3274 if (sum) { 3275 KMOD_IPSTAT_INC(ips_badsum); 3276 goto bad; 3277 } 3278 3279 /* Retrieve the packet length. */ 3280 len = ntohs(ip->ip_len); 3281 3282 /* 3283 * Check for additional length bogosity 3284 */ 3285 if (len < hlen) { 3286 KMOD_IPSTAT_INC(ips_badlen); 3287 goto bad; 3288 } 3289 3290 /* 3291 * Check that the amount of data in the buffers 3292 * is as at least much as the IP header would have us expect. 3293 * Drop packet if shorter than we expect. 3294 */ 3295 if (m->m_pkthdr.len < len) { 3296 KMOD_IPSTAT_INC(ips_tooshort); 3297 goto bad; 3298 } 3299 3300 /* Checks out, proceed */ 3301 *mp = m; 3302 return (0); 3303 3304 bad: 3305 *mp = m; 3306 return (-1); 3307 } 3308 3309 #ifdef INET6 3310 /* 3311 * Same as above, but for IPv6. 3312 * Cut-and-pasted from ip6_input.c. 3313 * XXX Should we update ip6stat, or not? 3314 */ 3315 static int 3316 bridge_ip6_checkbasic(struct mbuf **mp) 3317 { 3318 struct mbuf *m = *mp; 3319 struct ip6_hdr *ip6; 3320 3321 /* 3322 * If the IPv6 header is not aligned, slurp it up into a new 3323 * mbuf with space for link headers, in the event we forward 3324 * it. Otherwise, if it is aligned, make sure the entire base 3325 * IPv6 header is in the first mbuf of the chain. 3326 */ 3327 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3328 struct ifnet *inifp = m->m_pkthdr.rcvif; 3329 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3330 (max_linkhdr + 3) & ~3)) == NULL) { 3331 /* XXXJRT new stat, please */ 3332 V_ip6stat.ip6s_toosmall++; 3333 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3334 goto bad; 3335 } 3336 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3337 struct ifnet *inifp = m->m_pkthdr.rcvif; 3338 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3339 V_ip6stat.ip6s_toosmall++; 3340 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3341 goto bad; 3342 } 3343 } 3344 3345 ip6 = mtod(m, struct ip6_hdr *); 3346 3347 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3348 V_ip6stat.ip6s_badvers++; 3349 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3350 goto bad; 3351 } 3352 3353 /* Checks out, proceed */ 3354 *mp = m; 3355 return (0); 3356 3357 bad: 3358 *mp = m; 3359 return (-1); 3360 } 3361 #endif /* INET6 */ 3362 3363 /* 3364 * bridge_fragment: 3365 * 3366 * Return a fragmented mbuf chain. 3367 */ 3368 static int 3369 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3370 int snap, struct llc *llc) 3371 { 3372 struct mbuf *m0; 3373 struct ip *ip; 3374 int error = -1; 3375 3376 if (m->m_len < sizeof(struct ip) && 3377 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3378 goto out; 3379 ip = mtod(m, struct ip *); 3380 3381 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3382 CSUM_DELAY_IP); 3383 if (error) 3384 goto out; 3385 3386 /* walk the chain and re-add the Ethernet header */ 3387 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3388 if (error == 0) { 3389 if (snap) { 3390 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3391 if (m0 == NULL) { 3392 error = ENOBUFS; 3393 continue; 3394 } 3395 bcopy(llc, mtod(m0, caddr_t), 3396 sizeof(struct llc)); 3397 } 3398 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3399 if (m0 == NULL) { 3400 error = ENOBUFS; 3401 continue; 3402 } 3403 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3404 } else 3405 m_freem(m); 3406 } 3407 3408 if (error == 0) 3409 KMOD_IPSTAT_INC(ips_fragmented); 3410 3411 return (error); 3412 3413 out: 3414 if (m != NULL) 3415 m_freem(m); 3416 return (error); 3417 } 3418 3419 static void 3420 bridge_linkstate(struct ifnet *ifp) 3421 { 3422 struct bridge_softc *sc = ifp->if_bridge; 3423 struct bridge_iflist *bif; 3424 3425 BRIDGE_LOCK(sc); 3426 bif = bridge_lookup_member_if(sc, ifp); 3427 if (bif == NULL) { 3428 BRIDGE_UNLOCK(sc); 3429 return; 3430 } 3431 bridge_linkcheck(sc); 3432 BRIDGE_UNLOCK(sc); 3433 3434 bstp_linkstate(&bif->bif_stp); 3435 } 3436 3437 static void 3438 bridge_linkcheck(struct bridge_softc *sc) 3439 { 3440 struct bridge_iflist *bif; 3441 int new_link, hasls; 3442 3443 BRIDGE_LOCK_ASSERT(sc); 3444 new_link = LINK_STATE_DOWN; 3445 hasls = 0; 3446 /* Our link is considered up if at least one of our ports is active */ 3447 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3448 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3449 hasls++; 3450 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3451 new_link = LINK_STATE_UP; 3452 break; 3453 } 3454 } 3455 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3456 /* If no interfaces support link-state then we default to up */ 3457 new_link = LINK_STATE_UP; 3458 } 3459 if_link_state_change(sc->sc_ifp, new_link); 3460 } 3461