1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/mbuf.h> 85 #include <sys/malloc.h> 86 #include <sys/protosw.h> 87 #include <sys/systm.h> 88 #include <sys/jail.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 #include <sys/rwlock.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_clone.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_var.h> 111 #include <net/pfil.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> /* for struct arpcom */ 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #endif 123 #if defined(INET) || defined(INET6) 124 #include <netinet/ip_carp.h> 125 #endif 126 #include <machine/in_cksum.h> 127 #include <netinet/if_ether.h> /* for struct arpcom */ 128 #include <net/bridgestp.h> 129 #include <net/if_bridgevar.h> 130 #include <net/if_llc.h> 131 #include <net/if_vlan_var.h> 132 133 #include <net/route.h> 134 #include <netinet/ip_fw.h> 135 #include <netinet/ipfw/ip_fw_private.h> 136 137 /* 138 * Size of the route hash table. Must be a power of two. 139 */ 140 #ifndef BRIDGE_RTHASH_SIZE 141 #define BRIDGE_RTHASH_SIZE 1024 142 #endif 143 144 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 145 146 /* 147 * Default maximum number of addresses to cache. 148 */ 149 #ifndef BRIDGE_RTABLE_MAX 150 #define BRIDGE_RTABLE_MAX 2000 151 #endif 152 153 /* 154 * Timeout (in seconds) for entries learned dynamically. 155 */ 156 #ifndef BRIDGE_RTABLE_TIMEOUT 157 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 158 #endif 159 160 /* 161 * Number of seconds between walks of the route list. 162 */ 163 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 164 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 165 #endif 166 167 /* 168 * List of capabilities to possibly mask on the member interface. 169 */ 170 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 171 172 /* 173 * List of capabilities to strip 174 */ 175 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 176 177 /* 178 * Bridge interface list entry. 179 */ 180 struct bridge_iflist { 181 LIST_ENTRY(bridge_iflist) bif_next; 182 struct ifnet *bif_ifp; /* member if */ 183 struct bstp_port bif_stp; /* STP state */ 184 uint32_t bif_flags; /* member if flags */ 185 int bif_savedcaps; /* saved capabilities */ 186 uint32_t bif_addrmax; /* max # of addresses */ 187 uint32_t bif_addrcnt; /* cur. # of addresses */ 188 uint32_t bif_addrexceeded;/* # of address violations */ 189 }; 190 191 /* 192 * Bridge route node. 193 */ 194 struct bridge_rtnode { 195 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 196 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 197 struct bridge_iflist *brt_dst; /* destination if */ 198 unsigned long brt_expire; /* expiration time */ 199 uint8_t brt_flags; /* address flags */ 200 uint8_t brt_addr[ETHER_ADDR_LEN]; 201 uint16_t brt_vlan; /* vlan id */ 202 }; 203 #define brt_ifp brt_dst->bif_ifp 204 205 /* 206 * Software state for each bridge. 207 */ 208 struct bridge_softc { 209 struct ifnet *sc_ifp; /* make this an interface */ 210 LIST_ENTRY(bridge_softc) sc_list; 211 struct mtx sc_mtx; 212 struct cv sc_cv; 213 uint32_t sc_brtmax; /* max # of addresses */ 214 uint32_t sc_brtcnt; /* cur. # of addresses */ 215 uint32_t sc_brttimeout; /* rt timeout in seconds */ 216 struct callout sc_brcallout; /* bridge callout */ 217 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 218 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 219 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 220 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 221 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 222 uint32_t sc_rthash_key; /* key for hash */ 223 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 224 struct bstp_state sc_stp; /* STP state */ 225 uint32_t sc_brtexceeded; /* # of cache drops */ 226 struct ifnet *sc_ifaddr; /* member mac copied from */ 227 u_char sc_defaddr[6]; /* Default MAC address */ 228 }; 229 230 static struct mtx bridge_list_mtx; 231 eventhandler_tag bridge_detach_cookie = NULL; 232 233 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 234 235 uma_zone_t bridge_rtnode_zone; 236 237 static int bridge_clone_create(struct if_clone *, int, caddr_t); 238 static void bridge_clone_destroy(struct ifnet *); 239 240 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 241 static void bridge_mutecaps(struct bridge_softc *); 242 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 243 int); 244 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 245 static void bridge_init(void *); 246 static void bridge_dummynet(struct mbuf *, struct ifnet *); 247 static void bridge_stop(struct ifnet *, int); 248 static void bridge_start(struct ifnet *); 249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 250 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 251 struct rtentry *); 252 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 253 struct mbuf *); 254 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 255 256 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 257 struct mbuf *m); 258 259 static void bridge_timer(void *); 260 261 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 262 struct mbuf *, int); 263 static void bridge_span(struct bridge_softc *, struct mbuf *); 264 265 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 266 uint16_t, struct bridge_iflist *, int, uint8_t); 267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 268 uint16_t); 269 static void bridge_rttrim(struct bridge_softc *); 270 static void bridge_rtage(struct bridge_softc *); 271 static void bridge_rtflush(struct bridge_softc *, int); 272 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 273 uint16_t); 274 275 static int bridge_rtable_init(struct bridge_softc *); 276 static void bridge_rtable_fini(struct bridge_softc *); 277 278 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 280 const uint8_t *, uint16_t); 281 static int bridge_rtnode_insert(struct bridge_softc *, 282 struct bridge_rtnode *); 283 static void bridge_rtnode_destroy(struct bridge_softc *, 284 struct bridge_rtnode *); 285 static void bridge_rtable_expire(struct ifnet *, int); 286 static void bridge_state_change(struct ifnet *, int); 287 288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 289 const char *name); 290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 291 struct ifnet *ifp); 292 static void bridge_delete_member(struct bridge_softc *, 293 struct bridge_iflist *, int); 294 static void bridge_delete_span(struct bridge_softc *, 295 struct bridge_iflist *); 296 297 static int bridge_ioctl_add(struct bridge_softc *, void *); 298 static int bridge_ioctl_del(struct bridge_softc *, void *); 299 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 301 static int bridge_ioctl_scache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 303 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 304 static int bridge_ioctl_rts(struct bridge_softc *, void *); 305 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 306 static int bridge_ioctl_sto(struct bridge_softc *, void *); 307 static int bridge_ioctl_gto(struct bridge_softc *, void *); 308 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 309 static int bridge_ioctl_flush(struct bridge_softc *, void *); 310 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 311 static int bridge_ioctl_spri(struct bridge_softc *, void *); 312 static int bridge_ioctl_ght(struct bridge_softc *, void *); 313 static int bridge_ioctl_sht(struct bridge_softc *, void *); 314 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 316 static int bridge_ioctl_gma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sma(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 321 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 323 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 324 static int bridge_ioctl_grte(struct bridge_softc *, void *); 325 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 326 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 327 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 328 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 329 int); 330 static int bridge_ip_checkbasic(struct mbuf **mp); 331 #ifdef INET6 332 static int bridge_ip6_checkbasic(struct mbuf **mp); 333 #endif /* INET6 */ 334 static int bridge_fragment(struct ifnet *, struct mbuf *, 335 struct ether_header *, int, struct llc *); 336 static void bridge_linkstate(struct ifnet *ifp); 337 static void bridge_linkcheck(struct bridge_softc *sc); 338 339 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 340 341 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 342 #define VLANTAGOF(_m) \ 343 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 344 345 static struct bstp_cb_ops bridge_ops = { 346 .bcb_state = bridge_state_change, 347 .bcb_rtage = bridge_rtable_expire 348 }; 349 350 SYSCTL_DECL(_net_link); 351 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 352 353 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 354 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 355 static int pfil_member = 1; /* run pfil hooks on the member interface */ 356 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 357 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 358 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 359 locally destined packets */ 360 static int log_stp = 0; /* log STP state changes */ 361 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 362 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 364 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 365 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 367 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 368 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 369 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 370 &pfil_bridge, 0, "Packet filter on the bridge interface"); 371 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 372 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 373 &pfil_member, 0, "Packet filter on the member interface"); 374 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 376 &pfil_local_phys, 0, 377 "Packet filter on the physical interface for locally destined packets"); 378 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 379 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 380 &log_stp, 0, "Log STP state changes"); 381 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 382 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 383 &bridge_inherit_mac, 0, 384 "Inherit MAC address from the first bridge member"); 385 386 struct bridge_control { 387 int (*bc_func)(struct bridge_softc *, void *); 388 int bc_argsize; 389 int bc_flags; 390 }; 391 392 #define BC_F_COPYIN 0x01 /* copy arguments in */ 393 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 394 #define BC_F_SUSER 0x04 /* do super-user check */ 395 396 const struct bridge_control bridge_control_table[] = { 397 { bridge_ioctl_add, sizeof(struct ifbreq), 398 BC_F_COPYIN|BC_F_SUSER }, 399 { bridge_ioctl_del, sizeof(struct ifbreq), 400 BC_F_COPYIN|BC_F_SUSER }, 401 402 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 403 BC_F_COPYIN|BC_F_COPYOUT }, 404 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 405 BC_F_COPYIN|BC_F_SUSER }, 406 407 { bridge_ioctl_scache, sizeof(struct ifbrparam), 408 BC_F_COPYIN|BC_F_SUSER }, 409 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 410 BC_F_COPYOUT }, 411 412 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 413 BC_F_COPYIN|BC_F_COPYOUT }, 414 { bridge_ioctl_rts, sizeof(struct ifbaconf), 415 BC_F_COPYIN|BC_F_COPYOUT }, 416 417 { bridge_ioctl_saddr, sizeof(struct ifbareq), 418 BC_F_COPYIN|BC_F_SUSER }, 419 420 { bridge_ioctl_sto, sizeof(struct ifbrparam), 421 BC_F_COPYIN|BC_F_SUSER }, 422 { bridge_ioctl_gto, sizeof(struct ifbrparam), 423 BC_F_COPYOUT }, 424 425 { bridge_ioctl_daddr, sizeof(struct ifbareq), 426 BC_F_COPYIN|BC_F_SUSER }, 427 428 { bridge_ioctl_flush, sizeof(struct ifbreq), 429 BC_F_COPYIN|BC_F_SUSER }, 430 431 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 432 BC_F_COPYOUT }, 433 { bridge_ioctl_spri, sizeof(struct ifbrparam), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_ght, sizeof(struct ifbrparam), 437 BC_F_COPYOUT }, 438 { bridge_ioctl_sht, sizeof(struct ifbrparam), 439 BC_F_COPYIN|BC_F_SUSER }, 440 441 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 442 BC_F_COPYOUT }, 443 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 444 BC_F_COPYIN|BC_F_SUSER }, 445 446 { bridge_ioctl_gma, sizeof(struct ifbrparam), 447 BC_F_COPYOUT }, 448 { bridge_ioctl_sma, sizeof(struct ifbrparam), 449 BC_F_COPYIN|BC_F_SUSER }, 450 451 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 452 BC_F_COPYIN|BC_F_SUSER }, 453 454 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 455 BC_F_COPYIN|BC_F_SUSER }, 456 457 { bridge_ioctl_addspan, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 { bridge_ioctl_delspan, sizeof(struct ifbreq), 460 BC_F_COPYIN|BC_F_SUSER }, 461 462 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 463 BC_F_COPYOUT }, 464 465 { bridge_ioctl_grte, sizeof(struct ifbrparam), 466 BC_F_COPYOUT }, 467 468 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 469 BC_F_COPYIN|BC_F_COPYOUT }, 470 471 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 472 BC_F_COPYIN|BC_F_SUSER }, 473 474 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 475 BC_F_COPYIN|BC_F_SUSER }, 476 477 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 478 BC_F_COPYIN|BC_F_SUSER }, 479 480 }; 481 const int bridge_control_table_size = 482 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 483 484 LIST_HEAD(, bridge_softc) bridge_list; 485 486 IFC_SIMPLE_DECLARE(bridge, 0); 487 488 static int 489 bridge_modevent(module_t mod, int type, void *data) 490 { 491 492 switch (type) { 493 case MOD_LOAD: 494 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 495 if_clone_attach(&bridge_cloner); 496 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 497 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 498 UMA_ALIGN_PTR, 0); 499 LIST_INIT(&bridge_list); 500 bridge_input_p = bridge_input; 501 bridge_output_p = bridge_output; 502 bridge_dn_p = bridge_dummynet; 503 bridge_linkstate_p = bridge_linkstate; 504 bridge_detach_cookie = EVENTHANDLER_REGISTER( 505 ifnet_departure_event, bridge_ifdetach, NULL, 506 EVENTHANDLER_PRI_ANY); 507 break; 508 case MOD_UNLOAD: 509 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 510 bridge_detach_cookie); 511 if_clone_detach(&bridge_cloner); 512 uma_zdestroy(bridge_rtnode_zone); 513 bridge_input_p = NULL; 514 bridge_output_p = NULL; 515 bridge_dn_p = NULL; 516 bridge_linkstate_p = NULL; 517 mtx_destroy(&bridge_list_mtx); 518 break; 519 default: 520 return (EOPNOTSUPP); 521 } 522 return (0); 523 } 524 525 static moduledata_t bridge_mod = { 526 "if_bridge", 527 bridge_modevent, 528 0 529 }; 530 531 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 532 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 533 534 /* 535 * handler for net.link.bridge.pfil_ipfw 536 */ 537 static int 538 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 539 { 540 int enable = pfil_ipfw; 541 int error; 542 543 error = sysctl_handle_int(oidp, &enable, 0, req); 544 enable = (enable) ? 1 : 0; 545 546 if (enable != pfil_ipfw) { 547 pfil_ipfw = enable; 548 549 /* 550 * Disable pfil so that ipfw doesnt run twice, if the user 551 * really wants both then they can re-enable pfil_bridge and/or 552 * pfil_member. Also allow non-ip packets as ipfw can filter by 553 * layer2 type. 554 */ 555 if (pfil_ipfw) { 556 pfil_onlyip = 0; 557 pfil_bridge = 0; 558 pfil_member = 0; 559 } 560 } 561 562 return (error); 563 } 564 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 565 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 566 567 /* 568 * bridge_clone_create: 569 * 570 * Create a new bridge instance. 571 */ 572 static int 573 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 574 { 575 struct bridge_softc *sc, *sc2; 576 struct ifnet *bifp, *ifp; 577 int fb, retry; 578 unsigned long hostid; 579 580 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 581 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 582 if (ifp == NULL) { 583 free(sc, M_DEVBUF); 584 return (ENOSPC); 585 } 586 587 BRIDGE_LOCK_INIT(sc); 588 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 589 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 590 591 /* Initialize our routing table. */ 592 bridge_rtable_init(sc); 593 594 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 595 596 LIST_INIT(&sc->sc_iflist); 597 LIST_INIT(&sc->sc_spanlist); 598 599 ifp->if_softc = sc; 600 if_initname(ifp, ifc->ifc_name, unit); 601 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 602 ifp->if_ioctl = bridge_ioctl; 603 ifp->if_start = bridge_start; 604 ifp->if_init = bridge_init; 605 ifp->if_type = IFT_BRIDGE; 606 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 607 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 608 IFQ_SET_READY(&ifp->if_snd); 609 610 /* 611 * Generate an ethernet address with a locally administered address. 612 * 613 * Since we are using random ethernet addresses for the bridge, it is 614 * possible that we might have address collisions, so make sure that 615 * this hardware address isn't already in use on another bridge. 616 * The first try uses the hostid and falls back to arc4rand(). 617 */ 618 fb = 0; 619 getcredhostid(curthread->td_ucred, &hostid); 620 for (retry = 1; retry != 0;) { 621 if (fb || hostid == 0) { 622 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 623 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 624 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 625 } else { 626 sc->sc_defaddr[0] = 0x2; 627 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 628 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 629 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 630 sc->sc_defaddr[4] = hostid & 0xff; 631 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 632 } 633 634 fb = 1; 635 retry = 0; 636 mtx_lock(&bridge_list_mtx); 637 LIST_FOREACH(sc2, &bridge_list, sc_list) { 638 bifp = sc2->sc_ifp; 639 if (memcmp(sc->sc_defaddr, 640 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 641 retry = 1; 642 } 643 mtx_unlock(&bridge_list_mtx); 644 } 645 646 bstp_attach(&sc->sc_stp, &bridge_ops); 647 ether_ifattach(ifp, sc->sc_defaddr); 648 /* Now undo some of the damage... */ 649 ifp->if_baudrate = 0; 650 ifp->if_type = IFT_BRIDGE; 651 652 mtx_lock(&bridge_list_mtx); 653 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 654 mtx_unlock(&bridge_list_mtx); 655 656 return (0); 657 } 658 659 /* 660 * bridge_clone_destroy: 661 * 662 * Destroy a bridge instance. 663 */ 664 static void 665 bridge_clone_destroy(struct ifnet *ifp) 666 { 667 struct bridge_softc *sc = ifp->if_softc; 668 struct bridge_iflist *bif; 669 670 BRIDGE_LOCK(sc); 671 672 bridge_stop(ifp, 1); 673 ifp->if_flags &= ~IFF_UP; 674 675 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 676 bridge_delete_member(sc, bif, 0); 677 678 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 679 bridge_delete_span(sc, bif); 680 } 681 682 BRIDGE_UNLOCK(sc); 683 684 callout_drain(&sc->sc_brcallout); 685 686 mtx_lock(&bridge_list_mtx); 687 LIST_REMOVE(sc, sc_list); 688 mtx_unlock(&bridge_list_mtx); 689 690 bstp_detach(&sc->sc_stp); 691 ether_ifdetach(ifp); 692 if_free(ifp); 693 694 /* Tear down the routing table. */ 695 bridge_rtable_fini(sc); 696 697 BRIDGE_LOCK_DESTROY(sc); 698 free(sc, M_DEVBUF); 699 } 700 701 /* 702 * bridge_ioctl: 703 * 704 * Handle a control request from the operator. 705 */ 706 static int 707 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 708 { 709 struct bridge_softc *sc = ifp->if_softc; 710 struct ifreq *ifr = (struct ifreq *)data; 711 struct bridge_iflist *bif; 712 struct thread *td = curthread; 713 union { 714 struct ifbreq ifbreq; 715 struct ifbifconf ifbifconf; 716 struct ifbareq ifbareq; 717 struct ifbaconf ifbaconf; 718 struct ifbrparam ifbrparam; 719 struct ifbropreq ifbropreq; 720 } args; 721 struct ifdrv *ifd = (struct ifdrv *) data; 722 const struct bridge_control *bc; 723 int error = 0; 724 725 switch (cmd) { 726 727 case SIOCADDMULTI: 728 case SIOCDELMULTI: 729 break; 730 731 case SIOCGDRVSPEC: 732 case SIOCSDRVSPEC: 733 if (ifd->ifd_cmd >= bridge_control_table_size) { 734 error = EINVAL; 735 break; 736 } 737 bc = &bridge_control_table[ifd->ifd_cmd]; 738 739 if (cmd == SIOCGDRVSPEC && 740 (bc->bc_flags & BC_F_COPYOUT) == 0) { 741 error = EINVAL; 742 break; 743 } 744 else if (cmd == SIOCSDRVSPEC && 745 (bc->bc_flags & BC_F_COPYOUT) != 0) { 746 error = EINVAL; 747 break; 748 } 749 750 if (bc->bc_flags & BC_F_SUSER) { 751 error = priv_check(td, PRIV_NET_BRIDGE); 752 if (error) 753 break; 754 } 755 756 if (ifd->ifd_len != bc->bc_argsize || 757 ifd->ifd_len > sizeof(args)) { 758 error = EINVAL; 759 break; 760 } 761 762 bzero(&args, sizeof(args)); 763 if (bc->bc_flags & BC_F_COPYIN) { 764 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 765 if (error) 766 break; 767 } 768 769 BRIDGE_LOCK(sc); 770 error = (*bc->bc_func)(sc, &args); 771 BRIDGE_UNLOCK(sc); 772 if (error) 773 break; 774 775 if (bc->bc_flags & BC_F_COPYOUT) 776 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 777 778 break; 779 780 case SIOCSIFFLAGS: 781 if (!(ifp->if_flags & IFF_UP) && 782 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 783 /* 784 * If interface is marked down and it is running, 785 * then stop and disable it. 786 */ 787 BRIDGE_LOCK(sc); 788 bridge_stop(ifp, 1); 789 BRIDGE_UNLOCK(sc); 790 } else if ((ifp->if_flags & IFF_UP) && 791 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 792 /* 793 * If interface is marked up and it is stopped, then 794 * start it. 795 */ 796 (*ifp->if_init)(sc); 797 } 798 break; 799 800 case SIOCSIFMTU: 801 if (ifr->ifr_mtu < 576) { 802 error = EINVAL; 803 break; 804 } 805 if (LIST_EMPTY(&sc->sc_iflist)) { 806 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 807 break; 808 } 809 BRIDGE_LOCK(sc); 810 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 811 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 812 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 813 " != %d\n", sc->sc_ifp->if_xname, 814 bif->bif_ifp->if_mtu, 815 bif->bif_ifp->if_xname, ifr->ifr_mtu); 816 error = EINVAL; 817 break; 818 } 819 } 820 if (!error) 821 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 822 BRIDGE_UNLOCK(sc); 823 break; 824 default: 825 /* 826 * drop the lock as ether_ioctl() will call bridge_start() and 827 * cause the lock to be recursed. 828 */ 829 error = ether_ioctl(ifp, cmd, data); 830 break; 831 } 832 833 return (error); 834 } 835 836 /* 837 * bridge_mutecaps: 838 * 839 * Clear or restore unwanted capabilities on the member interface 840 */ 841 static void 842 bridge_mutecaps(struct bridge_softc *sc) 843 { 844 struct bridge_iflist *bif; 845 int enabled, mask; 846 847 /* Initial bitmask of capabilities to test */ 848 mask = BRIDGE_IFCAPS_MASK; 849 850 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 851 /* Every member must support it or its disabled */ 852 mask &= bif->bif_savedcaps; 853 } 854 855 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 856 enabled = bif->bif_ifp->if_capenable; 857 enabled &= ~BRIDGE_IFCAPS_STRIP; 858 /* strip off mask bits and enable them again if allowed */ 859 enabled &= ~BRIDGE_IFCAPS_MASK; 860 enabled |= mask; 861 bridge_set_ifcap(sc, bif, enabled); 862 } 863 864 } 865 866 static void 867 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 868 { 869 struct ifnet *ifp = bif->bif_ifp; 870 struct ifreq ifr; 871 int error; 872 873 bzero(&ifr, sizeof(ifr)); 874 ifr.ifr_reqcap = set; 875 876 if (ifp->if_capenable != set) { 877 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 878 if (error) 879 if_printf(sc->sc_ifp, 880 "error setting interface capabilities on %s\n", 881 ifp->if_xname); 882 } 883 } 884 885 /* 886 * bridge_lookup_member: 887 * 888 * Lookup a bridge member interface. 889 */ 890 static struct bridge_iflist * 891 bridge_lookup_member(struct bridge_softc *sc, const char *name) 892 { 893 struct bridge_iflist *bif; 894 struct ifnet *ifp; 895 896 BRIDGE_LOCK_ASSERT(sc); 897 898 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 899 ifp = bif->bif_ifp; 900 if (strcmp(ifp->if_xname, name) == 0) 901 return (bif); 902 } 903 904 return (NULL); 905 } 906 907 /* 908 * bridge_lookup_member_if: 909 * 910 * Lookup a bridge member interface by ifnet*. 911 */ 912 static struct bridge_iflist * 913 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 914 { 915 struct bridge_iflist *bif; 916 917 BRIDGE_LOCK_ASSERT(sc); 918 919 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 920 if (bif->bif_ifp == member_ifp) 921 return (bif); 922 } 923 924 return (NULL); 925 } 926 927 /* 928 * bridge_delete_member: 929 * 930 * Delete the specified member interface. 931 */ 932 static void 933 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 934 int gone) 935 { 936 struct ifnet *ifs = bif->bif_ifp; 937 struct ifnet *fif = NULL; 938 939 BRIDGE_LOCK_ASSERT(sc); 940 941 if (bif->bif_flags & IFBIF_STP) 942 bstp_disable(&bif->bif_stp); 943 944 ifs->if_bridge = NULL; 945 BRIDGE_XLOCK(sc); 946 LIST_REMOVE(bif, bif_next); 947 BRIDGE_XDROP(sc); 948 949 /* 950 * If removing the interface that gave the bridge its mac address, set 951 * the mac address of the bridge to the address of the next member, or 952 * to its default address if no members are left. 953 */ 954 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 955 if (LIST_EMPTY(&sc->sc_iflist)) { 956 bcopy(sc->sc_defaddr, 957 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 958 sc->sc_ifaddr = NULL; 959 } else { 960 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 961 bcopy(IF_LLADDR(fif), 962 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 963 sc->sc_ifaddr = fif; 964 } 965 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 966 } 967 968 bridge_linkcheck(sc); 969 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 970 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 971 KASSERT(bif->bif_addrcnt == 0, 972 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 973 974 BRIDGE_UNLOCK(sc); 975 if (!gone) { 976 switch (ifs->if_type) { 977 case IFT_ETHER: 978 case IFT_L2VLAN: 979 /* 980 * Take the interface out of promiscuous mode. 981 */ 982 (void) ifpromisc(ifs, 0); 983 break; 984 985 case IFT_GIF: 986 break; 987 988 default: 989 #ifdef DIAGNOSTIC 990 panic("bridge_delete_member: impossible"); 991 #endif 992 break; 993 } 994 /* reneable any interface capabilities */ 995 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 996 } 997 bstp_destroy(&bif->bif_stp); /* prepare to free */ 998 BRIDGE_LOCK(sc); 999 free(bif, M_DEVBUF); 1000 } 1001 1002 /* 1003 * bridge_delete_span: 1004 * 1005 * Delete the specified span interface. 1006 */ 1007 static void 1008 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1009 { 1010 BRIDGE_LOCK_ASSERT(sc); 1011 1012 KASSERT(bif->bif_ifp->if_bridge == NULL, 1013 ("%s: not a span interface", __func__)); 1014 1015 LIST_REMOVE(bif, bif_next); 1016 free(bif, M_DEVBUF); 1017 } 1018 1019 static int 1020 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1021 { 1022 struct ifbreq *req = arg; 1023 struct bridge_iflist *bif = NULL; 1024 struct ifnet *ifs; 1025 int error = 0; 1026 1027 ifs = ifunit(req->ifbr_ifsname); 1028 if (ifs == NULL) 1029 return (ENOENT); 1030 if (ifs->if_ioctl == NULL) /* must be supported */ 1031 return (EINVAL); 1032 1033 /* If it's in the span list, it can't be a member. */ 1034 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1035 if (ifs == bif->bif_ifp) 1036 return (EBUSY); 1037 1038 if (ifs->if_bridge == sc) 1039 return (EEXIST); 1040 1041 if (ifs->if_bridge != NULL) 1042 return (EBUSY); 1043 1044 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1045 if (bif == NULL) 1046 return (ENOMEM); 1047 1048 bif->bif_ifp = ifs; 1049 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1050 bif->bif_savedcaps = ifs->if_capenable; 1051 1052 switch (ifs->if_type) { 1053 case IFT_ETHER: 1054 case IFT_L2VLAN: 1055 case IFT_GIF: 1056 /* permitted interface types */ 1057 break; 1058 default: 1059 error = EINVAL; 1060 goto out; 1061 } 1062 1063 /* Allow the first Ethernet member to define the MTU */ 1064 if (LIST_EMPTY(&sc->sc_iflist)) 1065 sc->sc_ifp->if_mtu = ifs->if_mtu; 1066 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1067 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1068 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1069 error = EINVAL; 1070 goto out; 1071 } 1072 1073 /* 1074 * Assign the interface's MAC address to the bridge if it's the first 1075 * member and the MAC address of the bridge has not been changed from 1076 * the default randomly generated one. 1077 */ 1078 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1079 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1080 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1081 sc->sc_ifaddr = ifs; 1082 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1083 } 1084 1085 ifs->if_bridge = sc; 1086 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1087 /* 1088 * XXX: XLOCK HERE!?! 1089 * 1090 * NOTE: insert_***HEAD*** should be safe for the traversals. 1091 */ 1092 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1093 1094 /* Set interface capabilities to the intersection set of all members */ 1095 bridge_mutecaps(sc); 1096 bridge_linkcheck(sc); 1097 1098 /* Place the interface into promiscuous mode */ 1099 switch (ifs->if_type) { 1100 case IFT_ETHER: 1101 case IFT_L2VLAN: 1102 BRIDGE_UNLOCK(sc); 1103 error = ifpromisc(ifs, 1); 1104 BRIDGE_LOCK(sc); 1105 break; 1106 } 1107 if (error) 1108 bridge_delete_member(sc, bif, 0); 1109 out: 1110 if (error) { 1111 if (bif != NULL) 1112 free(bif, M_DEVBUF); 1113 } 1114 return (error); 1115 } 1116 1117 static int 1118 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1119 { 1120 struct ifbreq *req = arg; 1121 struct bridge_iflist *bif; 1122 1123 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1124 if (bif == NULL) 1125 return (ENOENT); 1126 1127 bridge_delete_member(sc, bif, 0); 1128 1129 return (0); 1130 } 1131 1132 static int 1133 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1134 { 1135 struct ifbreq *req = arg; 1136 struct bridge_iflist *bif; 1137 struct bstp_port *bp; 1138 1139 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1140 if (bif == NULL) 1141 return (ENOENT); 1142 1143 bp = &bif->bif_stp; 1144 req->ifbr_ifsflags = bif->bif_flags; 1145 req->ifbr_state = bp->bp_state; 1146 req->ifbr_priority = bp->bp_priority; 1147 req->ifbr_path_cost = bp->bp_path_cost; 1148 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1149 req->ifbr_proto = bp->bp_protover; 1150 req->ifbr_role = bp->bp_role; 1151 req->ifbr_stpflags = bp->bp_flags; 1152 req->ifbr_addrcnt = bif->bif_addrcnt; 1153 req->ifbr_addrmax = bif->bif_addrmax; 1154 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1155 1156 /* Copy STP state options as flags */ 1157 if (bp->bp_operedge) 1158 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1159 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1160 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1161 if (bp->bp_ptp_link) 1162 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1163 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1164 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1165 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1166 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1167 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1168 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1169 return (0); 1170 } 1171 1172 static int 1173 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbreq *req = arg; 1176 struct bridge_iflist *bif; 1177 struct bstp_port *bp; 1178 int error; 1179 1180 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1181 if (bif == NULL) 1182 return (ENOENT); 1183 bp = &bif->bif_stp; 1184 1185 if (req->ifbr_ifsflags & IFBIF_SPAN) 1186 /* SPAN is readonly */ 1187 return (EINVAL); 1188 1189 if (req->ifbr_ifsflags & IFBIF_STP) { 1190 if ((bif->bif_flags & IFBIF_STP) == 0) { 1191 error = bstp_enable(&bif->bif_stp); 1192 if (error) 1193 return (error); 1194 } 1195 } else { 1196 if ((bif->bif_flags & IFBIF_STP) != 0) 1197 bstp_disable(&bif->bif_stp); 1198 } 1199 1200 /* Pass on STP flags */ 1201 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1202 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1203 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1204 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1205 1206 /* Save the bits relating to the bridge */ 1207 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1208 1209 return (0); 1210 } 1211 1212 static int 1213 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1214 { 1215 struct ifbrparam *param = arg; 1216 1217 sc->sc_brtmax = param->ifbrp_csize; 1218 bridge_rttrim(sc); 1219 1220 return (0); 1221 } 1222 1223 static int 1224 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1225 { 1226 struct ifbrparam *param = arg; 1227 1228 param->ifbrp_csize = sc->sc_brtmax; 1229 1230 return (0); 1231 } 1232 1233 static int 1234 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1235 { 1236 struct ifbifconf *bifc = arg; 1237 struct bridge_iflist *bif; 1238 struct ifbreq breq; 1239 char *buf, *outbuf; 1240 int count, buflen, len, error = 0; 1241 1242 count = 0; 1243 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1244 count++; 1245 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1246 count++; 1247 1248 buflen = sizeof(breq) * count; 1249 if (bifc->ifbic_len == 0) { 1250 bifc->ifbic_len = buflen; 1251 return (0); 1252 } 1253 BRIDGE_UNLOCK(sc); 1254 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1255 BRIDGE_LOCK(sc); 1256 1257 count = 0; 1258 buf = outbuf; 1259 len = min(bifc->ifbic_len, buflen); 1260 bzero(&breq, sizeof(breq)); 1261 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1262 if (len < sizeof(breq)) 1263 break; 1264 1265 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1266 sizeof(breq.ifbr_ifsname)); 1267 /* Fill in the ifbreq structure */ 1268 error = bridge_ioctl_gifflags(sc, &breq); 1269 if (error) 1270 break; 1271 memcpy(buf, &breq, sizeof(breq)); 1272 count++; 1273 buf += sizeof(breq); 1274 len -= sizeof(breq); 1275 } 1276 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1277 if (len < sizeof(breq)) 1278 break; 1279 1280 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1281 sizeof(breq.ifbr_ifsname)); 1282 breq.ifbr_ifsflags = bif->bif_flags; 1283 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1284 memcpy(buf, &breq, sizeof(breq)); 1285 count++; 1286 buf += sizeof(breq); 1287 len -= sizeof(breq); 1288 } 1289 1290 BRIDGE_UNLOCK(sc); 1291 bifc->ifbic_len = sizeof(breq) * count; 1292 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1293 BRIDGE_LOCK(sc); 1294 free(outbuf, M_TEMP); 1295 return (error); 1296 } 1297 1298 static int 1299 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1300 { 1301 struct ifbaconf *bac = arg; 1302 struct bridge_rtnode *brt; 1303 struct ifbareq bareq; 1304 char *buf, *outbuf; 1305 int count, buflen, len, error = 0; 1306 1307 if (bac->ifbac_len == 0) 1308 return (0); 1309 1310 count = 0; 1311 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1312 count++; 1313 buflen = sizeof(bareq) * count; 1314 1315 BRIDGE_UNLOCK(sc); 1316 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1317 BRIDGE_LOCK(sc); 1318 1319 count = 0; 1320 buf = outbuf; 1321 len = min(bac->ifbac_len, buflen); 1322 bzero(&bareq, sizeof(bareq)); 1323 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1324 if (len < sizeof(bareq)) 1325 goto out; 1326 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1327 sizeof(bareq.ifba_ifsname)); 1328 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1329 bareq.ifba_vlan = brt->brt_vlan; 1330 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1331 time_uptime < brt->brt_expire) 1332 bareq.ifba_expire = brt->brt_expire - time_uptime; 1333 else 1334 bareq.ifba_expire = 0; 1335 bareq.ifba_flags = brt->brt_flags; 1336 1337 memcpy(buf, &bareq, sizeof(bareq)); 1338 count++; 1339 buf += sizeof(bareq); 1340 len -= sizeof(bareq); 1341 } 1342 out: 1343 BRIDGE_UNLOCK(sc); 1344 bac->ifbac_len = sizeof(bareq) * count; 1345 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1346 BRIDGE_LOCK(sc); 1347 free(outbuf, M_TEMP); 1348 return (error); 1349 } 1350 1351 static int 1352 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1353 { 1354 struct ifbareq *req = arg; 1355 struct bridge_iflist *bif; 1356 int error; 1357 1358 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1359 if (bif == NULL) 1360 return (ENOENT); 1361 1362 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1363 req->ifba_flags); 1364 1365 return (error); 1366 } 1367 1368 static int 1369 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1370 { 1371 struct ifbrparam *param = arg; 1372 1373 sc->sc_brttimeout = param->ifbrp_ctime; 1374 return (0); 1375 } 1376 1377 static int 1378 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1379 { 1380 struct ifbrparam *param = arg; 1381 1382 param->ifbrp_ctime = sc->sc_brttimeout; 1383 return (0); 1384 } 1385 1386 static int 1387 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1388 { 1389 struct ifbareq *req = arg; 1390 1391 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1392 } 1393 1394 static int 1395 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1396 { 1397 struct ifbreq *req = arg; 1398 1399 bridge_rtflush(sc, req->ifbr_ifsflags); 1400 return (0); 1401 } 1402 1403 static int 1404 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1405 { 1406 struct ifbrparam *param = arg; 1407 struct bstp_state *bs = &sc->sc_stp; 1408 1409 param->ifbrp_prio = bs->bs_bridge_priority; 1410 return (0); 1411 } 1412 1413 static int 1414 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1415 { 1416 struct ifbrparam *param = arg; 1417 1418 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1419 } 1420 1421 static int 1422 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1423 { 1424 struct ifbrparam *param = arg; 1425 struct bstp_state *bs = &sc->sc_stp; 1426 1427 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1428 return (0); 1429 } 1430 1431 static int 1432 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1433 { 1434 struct ifbrparam *param = arg; 1435 1436 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1437 } 1438 1439 static int 1440 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1441 { 1442 struct ifbrparam *param = arg; 1443 struct bstp_state *bs = &sc->sc_stp; 1444 1445 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1446 return (0); 1447 } 1448 1449 static int 1450 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1451 { 1452 struct ifbrparam *param = arg; 1453 1454 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1455 } 1456 1457 static int 1458 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1459 { 1460 struct ifbrparam *param = arg; 1461 struct bstp_state *bs = &sc->sc_stp; 1462 1463 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1464 return (0); 1465 } 1466 1467 static int 1468 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1469 { 1470 struct ifbrparam *param = arg; 1471 1472 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1473 } 1474 1475 static int 1476 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1477 { 1478 struct ifbreq *req = arg; 1479 struct bridge_iflist *bif; 1480 1481 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1482 if (bif == NULL) 1483 return (ENOENT); 1484 1485 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1486 } 1487 1488 static int 1489 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1490 { 1491 struct ifbreq *req = arg; 1492 struct bridge_iflist *bif; 1493 1494 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1495 if (bif == NULL) 1496 return (ENOENT); 1497 1498 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1499 } 1500 1501 static int 1502 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1503 { 1504 struct ifbreq *req = arg; 1505 struct bridge_iflist *bif; 1506 1507 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1508 if (bif == NULL) 1509 return (ENOENT); 1510 1511 bif->bif_addrmax = req->ifbr_addrmax; 1512 return (0); 1513 } 1514 1515 static int 1516 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1517 { 1518 struct ifbreq *req = arg; 1519 struct bridge_iflist *bif = NULL; 1520 struct ifnet *ifs; 1521 1522 ifs = ifunit(req->ifbr_ifsname); 1523 if (ifs == NULL) 1524 return (ENOENT); 1525 1526 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1527 if (ifs == bif->bif_ifp) 1528 return (EBUSY); 1529 1530 if (ifs->if_bridge != NULL) 1531 return (EBUSY); 1532 1533 switch (ifs->if_type) { 1534 case IFT_ETHER: 1535 case IFT_GIF: 1536 case IFT_L2VLAN: 1537 break; 1538 default: 1539 return (EINVAL); 1540 } 1541 1542 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1543 if (bif == NULL) 1544 return (ENOMEM); 1545 1546 bif->bif_ifp = ifs; 1547 bif->bif_flags = IFBIF_SPAN; 1548 1549 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1550 1551 return (0); 1552 } 1553 1554 static int 1555 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1556 { 1557 struct ifbreq *req = arg; 1558 struct bridge_iflist *bif; 1559 struct ifnet *ifs; 1560 1561 ifs = ifunit(req->ifbr_ifsname); 1562 if (ifs == NULL) 1563 return (ENOENT); 1564 1565 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1566 if (ifs == bif->bif_ifp) 1567 break; 1568 1569 if (bif == NULL) 1570 return (ENOENT); 1571 1572 bridge_delete_span(sc, bif); 1573 1574 return (0); 1575 } 1576 1577 static int 1578 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1579 { 1580 struct ifbropreq *req = arg; 1581 struct bstp_state *bs = &sc->sc_stp; 1582 struct bstp_port *root_port; 1583 1584 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1585 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1586 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1587 1588 root_port = bs->bs_root_port; 1589 if (root_port == NULL) 1590 req->ifbop_root_port = 0; 1591 else 1592 req->ifbop_root_port = root_port->bp_ifp->if_index; 1593 1594 req->ifbop_holdcount = bs->bs_txholdcount; 1595 req->ifbop_priority = bs->bs_bridge_priority; 1596 req->ifbop_protocol = bs->bs_protover; 1597 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1598 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1599 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1600 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1601 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1602 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1603 1604 return (0); 1605 } 1606 1607 static int 1608 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1609 { 1610 struct ifbrparam *param = arg; 1611 1612 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1613 return (0); 1614 } 1615 1616 static int 1617 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1618 { 1619 struct ifbpstpconf *bifstp = arg; 1620 struct bridge_iflist *bif; 1621 struct bstp_port *bp; 1622 struct ifbpstpreq bpreq; 1623 char *buf, *outbuf; 1624 int count, buflen, len, error = 0; 1625 1626 count = 0; 1627 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1628 if ((bif->bif_flags & IFBIF_STP) != 0) 1629 count++; 1630 } 1631 1632 buflen = sizeof(bpreq) * count; 1633 if (bifstp->ifbpstp_len == 0) { 1634 bifstp->ifbpstp_len = buflen; 1635 return (0); 1636 } 1637 1638 BRIDGE_UNLOCK(sc); 1639 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1640 BRIDGE_LOCK(sc); 1641 1642 count = 0; 1643 buf = outbuf; 1644 len = min(bifstp->ifbpstp_len, buflen); 1645 bzero(&bpreq, sizeof(bpreq)); 1646 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1647 if (len < sizeof(bpreq)) 1648 break; 1649 1650 if ((bif->bif_flags & IFBIF_STP) == 0) 1651 continue; 1652 1653 bp = &bif->bif_stp; 1654 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1655 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1656 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1657 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1658 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1659 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1660 1661 memcpy(buf, &bpreq, sizeof(bpreq)); 1662 count++; 1663 buf += sizeof(bpreq); 1664 len -= sizeof(bpreq); 1665 } 1666 1667 BRIDGE_UNLOCK(sc); 1668 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1669 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1670 BRIDGE_LOCK(sc); 1671 free(outbuf, M_TEMP); 1672 return (error); 1673 } 1674 1675 static int 1676 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1677 { 1678 struct ifbrparam *param = arg; 1679 1680 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1681 } 1682 1683 static int 1684 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1685 { 1686 struct ifbrparam *param = arg; 1687 1688 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1689 } 1690 1691 /* 1692 * bridge_ifdetach: 1693 * 1694 * Detach an interface from a bridge. Called when a member 1695 * interface is detaching. 1696 */ 1697 static void 1698 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1699 { 1700 struct bridge_softc *sc = ifp->if_bridge; 1701 struct bridge_iflist *bif; 1702 1703 /* Check if the interface is a bridge member */ 1704 if (sc != NULL) { 1705 BRIDGE_LOCK(sc); 1706 1707 bif = bridge_lookup_member_if(sc, ifp); 1708 if (bif != NULL) 1709 bridge_delete_member(sc, bif, 1); 1710 1711 BRIDGE_UNLOCK(sc); 1712 return; 1713 } 1714 1715 /* Check if the interface is a span port */ 1716 mtx_lock(&bridge_list_mtx); 1717 LIST_FOREACH(sc, &bridge_list, sc_list) { 1718 BRIDGE_LOCK(sc); 1719 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1720 if (ifp == bif->bif_ifp) { 1721 bridge_delete_span(sc, bif); 1722 break; 1723 } 1724 1725 BRIDGE_UNLOCK(sc); 1726 } 1727 mtx_unlock(&bridge_list_mtx); 1728 } 1729 1730 /* 1731 * bridge_init: 1732 * 1733 * Initialize a bridge interface. 1734 */ 1735 static void 1736 bridge_init(void *xsc) 1737 { 1738 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1739 struct ifnet *ifp = sc->sc_ifp; 1740 1741 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1742 return; 1743 1744 BRIDGE_LOCK(sc); 1745 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1746 bridge_timer, sc); 1747 1748 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1749 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1750 1751 BRIDGE_UNLOCK(sc); 1752 } 1753 1754 /* 1755 * bridge_stop: 1756 * 1757 * Stop the bridge interface. 1758 */ 1759 static void 1760 bridge_stop(struct ifnet *ifp, int disable) 1761 { 1762 struct bridge_softc *sc = ifp->if_softc; 1763 1764 BRIDGE_LOCK_ASSERT(sc); 1765 1766 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1767 return; 1768 1769 callout_stop(&sc->sc_brcallout); 1770 bstp_stop(&sc->sc_stp); 1771 1772 bridge_rtflush(sc, IFBF_FLUSHDYN); 1773 1774 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1775 } 1776 1777 /* 1778 * bridge_enqueue: 1779 * 1780 * Enqueue a packet on a bridge member interface. 1781 * 1782 */ 1783 static void 1784 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1785 { 1786 int len, err = 0; 1787 short mflags; 1788 struct mbuf *m0; 1789 1790 len = m->m_pkthdr.len; 1791 mflags = m->m_flags; 1792 1793 /* We may be sending a fragment so traverse the mbuf */ 1794 for (; m; m = m0) { 1795 m0 = m->m_nextpkt; 1796 m->m_nextpkt = NULL; 1797 1798 /* 1799 * If underlying interface can not do VLAN tag insertion itself 1800 * then attach a packet tag that holds it. 1801 */ 1802 if ((m->m_flags & M_VLANTAG) && 1803 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1804 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1805 if (m == NULL) { 1806 if_printf(dst_ifp, 1807 "unable to prepend VLAN header\n"); 1808 dst_ifp->if_oerrors++; 1809 continue; 1810 } 1811 m->m_flags &= ~M_VLANTAG; 1812 } 1813 1814 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1815 m_freem(m0); 1816 break; 1817 } 1818 } 1819 1820 if (err == 0) { 1821 sc->sc_ifp->if_opackets++; 1822 sc->sc_ifp->if_obytes += len; 1823 if (mflags & M_MCAST) 1824 sc->sc_ifp->if_omcasts++; 1825 } 1826 } 1827 1828 /* 1829 * bridge_dummynet: 1830 * 1831 * Receive a queued packet from dummynet and pass it on to the output 1832 * interface. 1833 * 1834 * The mbuf has the Ethernet header already attached. 1835 */ 1836 static void 1837 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1838 { 1839 struct bridge_softc *sc; 1840 1841 sc = ifp->if_bridge; 1842 1843 /* 1844 * The packet didnt originate from a member interface. This should only 1845 * ever happen if a member interface is removed while packets are 1846 * queued for it. 1847 */ 1848 if (sc == NULL) { 1849 m_freem(m); 1850 return; 1851 } 1852 1853 if (PFIL_HOOKED(&V_inet_pfil_hook) 1854 #ifdef INET6 1855 || PFIL_HOOKED(&V_inet6_pfil_hook) 1856 #endif 1857 ) { 1858 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1859 return; 1860 if (m == NULL) 1861 return; 1862 } 1863 1864 bridge_enqueue(sc, ifp, m); 1865 } 1866 1867 /* 1868 * bridge_output: 1869 * 1870 * Send output from a bridge member interface. This 1871 * performs the bridging function for locally originated 1872 * packets. 1873 * 1874 * The mbuf has the Ethernet header already attached. We must 1875 * enqueue or free the mbuf before returning. 1876 */ 1877 static int 1878 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1879 struct rtentry *rt) 1880 { 1881 struct ether_header *eh; 1882 struct ifnet *dst_if; 1883 struct bridge_softc *sc; 1884 uint16_t vlan; 1885 1886 if (m->m_len < ETHER_HDR_LEN) { 1887 m = m_pullup(m, ETHER_HDR_LEN); 1888 if (m == NULL) 1889 return (0); 1890 } 1891 1892 eh = mtod(m, struct ether_header *); 1893 sc = ifp->if_bridge; 1894 vlan = VLANTAGOF(m); 1895 1896 BRIDGE_LOCK(sc); 1897 1898 /* 1899 * If bridge is down, but the original output interface is up, 1900 * go ahead and send out that interface. Otherwise, the packet 1901 * is dropped below. 1902 */ 1903 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1904 dst_if = ifp; 1905 goto sendunicast; 1906 } 1907 1908 /* 1909 * If the packet is a multicast, or we don't know a better way to 1910 * get there, send to all interfaces. 1911 */ 1912 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1913 dst_if = NULL; 1914 else 1915 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1916 if (dst_if == NULL) { 1917 struct bridge_iflist *bif; 1918 struct mbuf *mc; 1919 int error = 0, used = 0; 1920 1921 bridge_span(sc, m); 1922 1923 BRIDGE_LOCK2REF(sc, error); 1924 if (error) { 1925 m_freem(m); 1926 return (0); 1927 } 1928 1929 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1930 dst_if = bif->bif_ifp; 1931 1932 if (dst_if->if_type == IFT_GIF) 1933 continue; 1934 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1935 continue; 1936 1937 /* 1938 * If this is not the original output interface, 1939 * and the interface is participating in spanning 1940 * tree, make sure the port is in a state that 1941 * allows forwarding. 1942 */ 1943 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1944 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1945 continue; 1946 1947 if (LIST_NEXT(bif, bif_next) == NULL) { 1948 used = 1; 1949 mc = m; 1950 } else { 1951 mc = m_copypacket(m, M_DONTWAIT); 1952 if (mc == NULL) { 1953 sc->sc_ifp->if_oerrors++; 1954 continue; 1955 } 1956 } 1957 1958 bridge_enqueue(sc, dst_if, mc); 1959 } 1960 if (used == 0) 1961 m_freem(m); 1962 BRIDGE_UNREF(sc); 1963 return (0); 1964 } 1965 1966 sendunicast: 1967 /* 1968 * XXX Spanning tree consideration here? 1969 */ 1970 1971 bridge_span(sc, m); 1972 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1973 m_freem(m); 1974 BRIDGE_UNLOCK(sc); 1975 return (0); 1976 } 1977 1978 BRIDGE_UNLOCK(sc); 1979 bridge_enqueue(sc, dst_if, m); 1980 return (0); 1981 } 1982 1983 /* 1984 * bridge_start: 1985 * 1986 * Start output on a bridge. 1987 * 1988 */ 1989 static void 1990 bridge_start(struct ifnet *ifp) 1991 { 1992 struct bridge_softc *sc; 1993 struct mbuf *m; 1994 struct ether_header *eh; 1995 struct ifnet *dst_if; 1996 1997 sc = ifp->if_softc; 1998 1999 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 2000 for (;;) { 2001 IFQ_DEQUEUE(&ifp->if_snd, m); 2002 if (m == 0) 2003 break; 2004 ETHER_BPF_MTAP(ifp, m); 2005 2006 eh = mtod(m, struct ether_header *); 2007 dst_if = NULL; 2008 2009 BRIDGE_LOCK(sc); 2010 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2011 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 2012 } 2013 2014 if (dst_if == NULL) 2015 bridge_broadcast(sc, ifp, m, 0); 2016 else { 2017 BRIDGE_UNLOCK(sc); 2018 bridge_enqueue(sc, dst_if, m); 2019 } 2020 } 2021 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 2022 } 2023 2024 /* 2025 * bridge_forward: 2026 * 2027 * The forwarding function of the bridge. 2028 * 2029 * NOTE: Releases the lock on return. 2030 */ 2031 static void 2032 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2033 struct mbuf *m) 2034 { 2035 struct bridge_iflist *dbif; 2036 struct ifnet *src_if, *dst_if, *ifp; 2037 struct ether_header *eh; 2038 uint16_t vlan; 2039 uint8_t *dst; 2040 int error; 2041 2042 src_if = m->m_pkthdr.rcvif; 2043 ifp = sc->sc_ifp; 2044 2045 ifp->if_ipackets++; 2046 ifp->if_ibytes += m->m_pkthdr.len; 2047 vlan = VLANTAGOF(m); 2048 2049 if ((sbif->bif_flags & IFBIF_STP) && 2050 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2051 goto drop; 2052 2053 eh = mtod(m, struct ether_header *); 2054 dst = eh->ether_dhost; 2055 2056 /* If the interface is learning, record the address. */ 2057 if (sbif->bif_flags & IFBIF_LEARNING) { 2058 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2059 sbif, 0, IFBAF_DYNAMIC); 2060 /* 2061 * If the interface has addresses limits then deny any source 2062 * that is not in the cache. 2063 */ 2064 if (error && sbif->bif_addrmax) 2065 goto drop; 2066 } 2067 2068 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2069 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2070 goto drop; 2071 2072 /* 2073 * At this point, the port either doesn't participate 2074 * in spanning tree or it is in the forwarding state. 2075 */ 2076 2077 /* 2078 * If the packet is unicast, destined for someone on 2079 * "this" side of the bridge, drop it. 2080 */ 2081 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2082 dst_if = bridge_rtlookup(sc, dst, vlan); 2083 if (src_if == dst_if) 2084 goto drop; 2085 } else { 2086 /* 2087 * Check if its a reserved multicast address, any address 2088 * listed in 802.1D section 7.12.6 may not be forwarded by the 2089 * bridge. 2090 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2091 */ 2092 if (dst[0] == 0x01 && dst[1] == 0x80 && 2093 dst[2] == 0xc2 && dst[3] == 0x00 && 2094 dst[4] == 0x00 && dst[5] <= 0x0f) 2095 goto drop; 2096 2097 /* ...forward it to all interfaces. */ 2098 ifp->if_imcasts++; 2099 dst_if = NULL; 2100 } 2101 2102 /* 2103 * If we have a destination interface which is a member of our bridge, 2104 * OR this is a unicast packet, push it through the bpf(4) machinery. 2105 * For broadcast or multicast packets, don't bother because it will 2106 * be reinjected into ether_input. We do this before we pass the packets 2107 * through the pfil(9) framework, as it is possible that pfil(9) will 2108 * drop the packet, or possibly modify it, making it difficult to debug 2109 * firewall issues on the bridge. 2110 */ 2111 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2112 ETHER_BPF_MTAP(ifp, m); 2113 2114 /* run the packet filter */ 2115 if (PFIL_HOOKED(&V_inet_pfil_hook) 2116 #ifdef INET6 2117 || PFIL_HOOKED(&V_inet6_pfil_hook) 2118 #endif 2119 ) { 2120 BRIDGE_UNLOCK(sc); 2121 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2122 return; 2123 if (m == NULL) 2124 return; 2125 BRIDGE_LOCK(sc); 2126 } 2127 2128 if (dst_if == NULL) { 2129 bridge_broadcast(sc, src_if, m, 1); 2130 return; 2131 } 2132 2133 /* 2134 * At this point, we're dealing with a unicast frame 2135 * going to a different interface. 2136 */ 2137 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2138 goto drop; 2139 2140 dbif = bridge_lookup_member_if(sc, dst_if); 2141 if (dbif == NULL) 2142 /* Not a member of the bridge (anymore?) */ 2143 goto drop; 2144 2145 /* Private segments can not talk to each other */ 2146 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2147 goto drop; 2148 2149 if ((dbif->bif_flags & IFBIF_STP) && 2150 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2151 goto drop; 2152 2153 BRIDGE_UNLOCK(sc); 2154 2155 if (PFIL_HOOKED(&V_inet_pfil_hook) 2156 #ifdef INET6 2157 || PFIL_HOOKED(&V_inet6_pfil_hook) 2158 #endif 2159 ) { 2160 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2161 return; 2162 if (m == NULL) 2163 return; 2164 } 2165 2166 bridge_enqueue(sc, dst_if, m); 2167 return; 2168 2169 drop: 2170 BRIDGE_UNLOCK(sc); 2171 m_freem(m); 2172 } 2173 2174 /* 2175 * bridge_input: 2176 * 2177 * Receive input from a member interface. Queue the packet for 2178 * bridging if it is not for us. 2179 */ 2180 static struct mbuf * 2181 bridge_input(struct ifnet *ifp, struct mbuf *m) 2182 { 2183 struct bridge_softc *sc = ifp->if_bridge; 2184 struct bridge_iflist *bif, *bif2; 2185 struct ifnet *bifp; 2186 struct ether_header *eh; 2187 struct mbuf *mc, *mc2; 2188 uint16_t vlan; 2189 int error; 2190 2191 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2192 return (m); 2193 2194 bifp = sc->sc_ifp; 2195 vlan = VLANTAGOF(m); 2196 2197 /* 2198 * Implement support for bridge monitoring. If this flag has been 2199 * set on this interface, discard the packet once we push it through 2200 * the bpf(4) machinery, but before we do, increment the byte and 2201 * packet counters associated with this interface. 2202 */ 2203 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2204 m->m_pkthdr.rcvif = bifp; 2205 ETHER_BPF_MTAP(bifp, m); 2206 bifp->if_ipackets++; 2207 bifp->if_ibytes += m->m_pkthdr.len; 2208 m_freem(m); 2209 return (NULL); 2210 } 2211 BRIDGE_LOCK(sc); 2212 bif = bridge_lookup_member_if(sc, ifp); 2213 if (bif == NULL) { 2214 BRIDGE_UNLOCK(sc); 2215 return (m); 2216 } 2217 2218 eh = mtod(m, struct ether_header *); 2219 2220 bridge_span(sc, m); 2221 2222 if (m->m_flags & (M_BCAST|M_MCAST)) { 2223 /* Tap off 802.1D packets; they do not get forwarded. */ 2224 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2225 ETHER_ADDR_LEN) == 0) { 2226 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2227 BRIDGE_UNLOCK(sc); 2228 return (NULL); 2229 } 2230 2231 if ((bif->bif_flags & IFBIF_STP) && 2232 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2233 BRIDGE_UNLOCK(sc); 2234 return (m); 2235 } 2236 2237 /* 2238 * Make a deep copy of the packet and enqueue the copy 2239 * for bridge processing; return the original packet for 2240 * local processing. 2241 */ 2242 mc = m_dup(m, M_DONTWAIT); 2243 if (mc == NULL) { 2244 BRIDGE_UNLOCK(sc); 2245 return (m); 2246 } 2247 2248 /* Perform the bridge forwarding function with the copy. */ 2249 bridge_forward(sc, bif, mc); 2250 2251 /* 2252 * Reinject the mbuf as arriving on the bridge so we have a 2253 * chance at claiming multicast packets. We can not loop back 2254 * here from ether_input as a bridge is never a member of a 2255 * bridge. 2256 */ 2257 KASSERT(bifp->if_bridge == NULL, 2258 ("loop created in bridge_input")); 2259 mc2 = m_dup(m, M_DONTWAIT); 2260 if (mc2 != NULL) { 2261 /* Keep the layer3 header aligned */ 2262 int i = min(mc2->m_pkthdr.len, max_protohdr); 2263 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2264 } 2265 if (mc2 != NULL) { 2266 mc2->m_pkthdr.rcvif = bifp; 2267 (*bifp->if_input)(bifp, mc2); 2268 } 2269 2270 /* Return the original packet for local processing. */ 2271 return (m); 2272 } 2273 2274 if ((bif->bif_flags & IFBIF_STP) && 2275 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2276 BRIDGE_UNLOCK(sc); 2277 return (m); 2278 } 2279 2280 #if (defined(INET) || defined(INET6)) 2281 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2282 || ((iface)->if_carp \ 2283 && (*carp_forus_p)((iface), eh->ether_dhost)) 2284 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2285 || ((iface)->if_carp \ 2286 && (*carp_forus_p)((iface), eh->ether_shost)) 2287 #else 2288 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2289 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2290 #endif 2291 2292 #ifdef INET6 2293 # define OR_PFIL_HOOKED_INET6 \ 2294 || PFIL_HOOKED(&V_inet6_pfil_hook) 2295 #else 2296 # define OR_PFIL_HOOKED_INET6 2297 #endif 2298 2299 #define GRAB_OUR_PACKETS(iface) \ 2300 if ((iface)->if_type == IFT_GIF) \ 2301 continue; \ 2302 /* It is destined for us. */ \ 2303 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2304 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2305 ) { \ 2306 if ((iface)->if_type == IFT_BRIDGE) { \ 2307 ETHER_BPF_MTAP(iface, m); \ 2308 iface->if_ipackets++; \ 2309 /* Filter on the physical interface. */ \ 2310 if (pfil_local_phys && \ 2311 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2312 OR_PFIL_HOOKED_INET6)) { \ 2313 if (bridge_pfil(&m, NULL, ifp, \ 2314 PFIL_IN) != 0 || m == NULL) { \ 2315 BRIDGE_UNLOCK(sc); \ 2316 return (NULL); \ 2317 } \ 2318 } \ 2319 } \ 2320 if (bif->bif_flags & IFBIF_LEARNING) { \ 2321 error = bridge_rtupdate(sc, eh->ether_shost, \ 2322 vlan, bif, 0, IFBAF_DYNAMIC); \ 2323 if (error && bif->bif_addrmax) { \ 2324 BRIDGE_UNLOCK(sc); \ 2325 m_freem(m); \ 2326 return (NULL); \ 2327 } \ 2328 } \ 2329 m->m_pkthdr.rcvif = iface; \ 2330 BRIDGE_UNLOCK(sc); \ 2331 return (m); \ 2332 } \ 2333 \ 2334 /* We just received a packet that we sent out. */ \ 2335 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2336 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2337 ) { \ 2338 BRIDGE_UNLOCK(sc); \ 2339 m_freem(m); \ 2340 return (NULL); \ 2341 } 2342 2343 /* 2344 * Unicast. Make sure it's not for the bridge. 2345 */ 2346 do { GRAB_OUR_PACKETS(bifp) } while (0); 2347 2348 /* 2349 * Give a chance for ifp at first priority. This will help when the 2350 * packet comes through the interface like VLAN's with the same MACs 2351 * on several interfaces from the same bridge. This also will save 2352 * some CPU cycles in case the destination interface and the input 2353 * interface (eq ifp) are the same. 2354 */ 2355 do { GRAB_OUR_PACKETS(ifp) } while (0); 2356 2357 /* Now check the all bridge members. */ 2358 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2359 GRAB_OUR_PACKETS(bif2->bif_ifp) 2360 } 2361 2362 #undef OR_CARP_CHECK_WE_ARE_DST 2363 #undef OR_CARP_CHECK_WE_ARE_SRC 2364 #undef OR_PFIL_HOOKED_INET6 2365 #undef GRAB_OUR_PACKETS 2366 2367 /* Perform the bridge forwarding function. */ 2368 bridge_forward(sc, bif, m); 2369 2370 return (NULL); 2371 } 2372 2373 /* 2374 * bridge_broadcast: 2375 * 2376 * Send a frame to all interfaces that are members of 2377 * the bridge, except for the one on which the packet 2378 * arrived. 2379 * 2380 * NOTE: Releases the lock on return. 2381 */ 2382 static void 2383 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2384 struct mbuf *m, int runfilt) 2385 { 2386 struct bridge_iflist *dbif, *sbif; 2387 struct mbuf *mc; 2388 struct ifnet *dst_if; 2389 int error = 0, used = 0, i; 2390 2391 sbif = bridge_lookup_member_if(sc, src_if); 2392 2393 BRIDGE_LOCK2REF(sc, error); 2394 if (error) { 2395 m_freem(m); 2396 return; 2397 } 2398 2399 /* Filter on the bridge interface before broadcasting */ 2400 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2401 #ifdef INET6 2402 || PFIL_HOOKED(&V_inet6_pfil_hook) 2403 #endif 2404 )) { 2405 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2406 goto out; 2407 if (m == NULL) 2408 goto out; 2409 } 2410 2411 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2412 dst_if = dbif->bif_ifp; 2413 if (dst_if == src_if) 2414 continue; 2415 2416 /* Private segments can not talk to each other */ 2417 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2418 continue; 2419 2420 if ((dbif->bif_flags & IFBIF_STP) && 2421 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2422 continue; 2423 2424 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2425 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2426 continue; 2427 2428 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2429 continue; 2430 2431 if (LIST_NEXT(dbif, bif_next) == NULL) { 2432 mc = m; 2433 used = 1; 2434 } else { 2435 mc = m_dup(m, M_DONTWAIT); 2436 if (mc == NULL) { 2437 sc->sc_ifp->if_oerrors++; 2438 continue; 2439 } 2440 } 2441 2442 /* 2443 * Filter on the output interface. Pass a NULL bridge interface 2444 * pointer so we do not redundantly filter on the bridge for 2445 * each interface we broadcast on. 2446 */ 2447 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2448 #ifdef INET6 2449 || PFIL_HOOKED(&V_inet6_pfil_hook) 2450 #endif 2451 )) { 2452 if (used == 0) { 2453 /* Keep the layer3 header aligned */ 2454 i = min(mc->m_pkthdr.len, max_protohdr); 2455 mc = m_copyup(mc, i, ETHER_ALIGN); 2456 if (mc == NULL) { 2457 sc->sc_ifp->if_oerrors++; 2458 continue; 2459 } 2460 } 2461 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2462 continue; 2463 if (mc == NULL) 2464 continue; 2465 } 2466 2467 bridge_enqueue(sc, dst_if, mc); 2468 } 2469 if (used == 0) 2470 m_freem(m); 2471 2472 out: 2473 BRIDGE_UNREF(sc); 2474 } 2475 2476 /* 2477 * bridge_span: 2478 * 2479 * Duplicate a packet out one or more interfaces that are in span mode, 2480 * the original mbuf is unmodified. 2481 */ 2482 static void 2483 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2484 { 2485 struct bridge_iflist *bif; 2486 struct ifnet *dst_if; 2487 struct mbuf *mc; 2488 2489 if (LIST_EMPTY(&sc->sc_spanlist)) 2490 return; 2491 2492 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2493 dst_if = bif->bif_ifp; 2494 2495 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2496 continue; 2497 2498 mc = m_copypacket(m, M_DONTWAIT); 2499 if (mc == NULL) { 2500 sc->sc_ifp->if_oerrors++; 2501 continue; 2502 } 2503 2504 bridge_enqueue(sc, dst_if, mc); 2505 } 2506 } 2507 2508 /* 2509 * bridge_rtupdate: 2510 * 2511 * Add a bridge routing entry. 2512 */ 2513 static int 2514 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2515 struct bridge_iflist *bif, int setflags, uint8_t flags) 2516 { 2517 struct bridge_rtnode *brt; 2518 int error; 2519 2520 BRIDGE_LOCK_ASSERT(sc); 2521 2522 /* Check the source address is valid and not multicast. */ 2523 if (ETHER_IS_MULTICAST(dst) || 2524 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2525 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2526 return (EINVAL); 2527 2528 /* 802.1p frames map to vlan 1 */ 2529 if (vlan == 0) 2530 vlan = 1; 2531 2532 /* 2533 * A route for this destination might already exist. If so, 2534 * update it, otherwise create a new one. 2535 */ 2536 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2537 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2538 sc->sc_brtexceeded++; 2539 return (ENOSPC); 2540 } 2541 /* Check per interface address limits (if enabled) */ 2542 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2543 bif->bif_addrexceeded++; 2544 return (ENOSPC); 2545 } 2546 2547 /* 2548 * Allocate a new bridge forwarding node, and 2549 * initialize the expiration time and Ethernet 2550 * address. 2551 */ 2552 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2553 if (brt == NULL) 2554 return (ENOMEM); 2555 2556 if (bif->bif_flags & IFBIF_STICKY) 2557 brt->brt_flags = IFBAF_STICKY; 2558 else 2559 brt->brt_flags = IFBAF_DYNAMIC; 2560 2561 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2562 brt->brt_vlan = vlan; 2563 2564 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2565 uma_zfree(bridge_rtnode_zone, brt); 2566 return (error); 2567 } 2568 brt->brt_dst = bif; 2569 bif->bif_addrcnt++; 2570 } 2571 2572 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2573 brt->brt_dst != bif) { 2574 brt->brt_dst->bif_addrcnt--; 2575 brt->brt_dst = bif; 2576 brt->brt_dst->bif_addrcnt++; 2577 } 2578 2579 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2580 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2581 if (setflags) 2582 brt->brt_flags = flags; 2583 2584 return (0); 2585 } 2586 2587 /* 2588 * bridge_rtlookup: 2589 * 2590 * Lookup the destination interface for an address. 2591 */ 2592 static struct ifnet * 2593 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2594 { 2595 struct bridge_rtnode *brt; 2596 2597 BRIDGE_LOCK_ASSERT(sc); 2598 2599 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2600 return (NULL); 2601 2602 return (brt->brt_ifp); 2603 } 2604 2605 /* 2606 * bridge_rttrim: 2607 * 2608 * Trim the routine table so that we have a number 2609 * of routing entries less than or equal to the 2610 * maximum number. 2611 */ 2612 static void 2613 bridge_rttrim(struct bridge_softc *sc) 2614 { 2615 struct bridge_rtnode *brt, *nbrt; 2616 2617 BRIDGE_LOCK_ASSERT(sc); 2618 2619 /* Make sure we actually need to do this. */ 2620 if (sc->sc_brtcnt <= sc->sc_brtmax) 2621 return; 2622 2623 /* Force an aging cycle; this might trim enough addresses. */ 2624 bridge_rtage(sc); 2625 if (sc->sc_brtcnt <= sc->sc_brtmax) 2626 return; 2627 2628 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2629 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2630 bridge_rtnode_destroy(sc, brt); 2631 if (sc->sc_brtcnt <= sc->sc_brtmax) 2632 return; 2633 } 2634 } 2635 } 2636 2637 /* 2638 * bridge_timer: 2639 * 2640 * Aging timer for the bridge. 2641 */ 2642 static void 2643 bridge_timer(void *arg) 2644 { 2645 struct bridge_softc *sc = arg; 2646 2647 BRIDGE_LOCK_ASSERT(sc); 2648 2649 bridge_rtage(sc); 2650 2651 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2652 callout_reset(&sc->sc_brcallout, 2653 bridge_rtable_prune_period * hz, bridge_timer, sc); 2654 } 2655 2656 /* 2657 * bridge_rtage: 2658 * 2659 * Perform an aging cycle. 2660 */ 2661 static void 2662 bridge_rtage(struct bridge_softc *sc) 2663 { 2664 struct bridge_rtnode *brt, *nbrt; 2665 2666 BRIDGE_LOCK_ASSERT(sc); 2667 2668 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2669 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2670 if (time_uptime >= brt->brt_expire) 2671 bridge_rtnode_destroy(sc, brt); 2672 } 2673 } 2674 } 2675 2676 /* 2677 * bridge_rtflush: 2678 * 2679 * Remove all dynamic addresses from the bridge. 2680 */ 2681 static void 2682 bridge_rtflush(struct bridge_softc *sc, int full) 2683 { 2684 struct bridge_rtnode *brt, *nbrt; 2685 2686 BRIDGE_LOCK_ASSERT(sc); 2687 2688 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2689 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2690 bridge_rtnode_destroy(sc, brt); 2691 } 2692 } 2693 2694 /* 2695 * bridge_rtdaddr: 2696 * 2697 * Remove an address from the table. 2698 */ 2699 static int 2700 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2701 { 2702 struct bridge_rtnode *brt; 2703 int found = 0; 2704 2705 BRIDGE_LOCK_ASSERT(sc); 2706 2707 /* 2708 * If vlan is zero then we want to delete for all vlans so the lookup 2709 * may return more than one. 2710 */ 2711 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2712 bridge_rtnode_destroy(sc, brt); 2713 found = 1; 2714 } 2715 2716 return (found ? 0 : ENOENT); 2717 } 2718 2719 /* 2720 * bridge_rtdelete: 2721 * 2722 * Delete routes to a speicifc member interface. 2723 */ 2724 static void 2725 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2726 { 2727 struct bridge_rtnode *brt, *nbrt; 2728 2729 BRIDGE_LOCK_ASSERT(sc); 2730 2731 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2732 if (brt->brt_ifp == ifp && (full || 2733 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2734 bridge_rtnode_destroy(sc, brt); 2735 } 2736 } 2737 2738 /* 2739 * bridge_rtable_init: 2740 * 2741 * Initialize the route table for this bridge. 2742 */ 2743 static int 2744 bridge_rtable_init(struct bridge_softc *sc) 2745 { 2746 int i; 2747 2748 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2749 M_DEVBUF, M_NOWAIT); 2750 if (sc->sc_rthash == NULL) 2751 return (ENOMEM); 2752 2753 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2754 LIST_INIT(&sc->sc_rthash[i]); 2755 2756 sc->sc_rthash_key = arc4random(); 2757 2758 LIST_INIT(&sc->sc_rtlist); 2759 2760 return (0); 2761 } 2762 2763 /* 2764 * bridge_rtable_fini: 2765 * 2766 * Deconstruct the route table for this bridge. 2767 */ 2768 static void 2769 bridge_rtable_fini(struct bridge_softc *sc) 2770 { 2771 2772 KASSERT(sc->sc_brtcnt == 0, 2773 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2774 free(sc->sc_rthash, M_DEVBUF); 2775 } 2776 2777 /* 2778 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2779 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2780 */ 2781 #define mix(a, b, c) \ 2782 do { \ 2783 a -= b; a -= c; a ^= (c >> 13); \ 2784 b -= c; b -= a; b ^= (a << 8); \ 2785 c -= a; c -= b; c ^= (b >> 13); \ 2786 a -= b; a -= c; a ^= (c >> 12); \ 2787 b -= c; b -= a; b ^= (a << 16); \ 2788 c -= a; c -= b; c ^= (b >> 5); \ 2789 a -= b; a -= c; a ^= (c >> 3); \ 2790 b -= c; b -= a; b ^= (a << 10); \ 2791 c -= a; c -= b; c ^= (b >> 15); \ 2792 } while (/*CONSTCOND*/0) 2793 2794 static __inline uint32_t 2795 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2796 { 2797 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2798 2799 b += addr[5] << 8; 2800 b += addr[4]; 2801 a += addr[3] << 24; 2802 a += addr[2] << 16; 2803 a += addr[1] << 8; 2804 a += addr[0]; 2805 2806 mix(a, b, c); 2807 2808 return (c & BRIDGE_RTHASH_MASK); 2809 } 2810 2811 #undef mix 2812 2813 static int 2814 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2815 { 2816 int i, d; 2817 2818 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2819 d = ((int)a[i]) - ((int)b[i]); 2820 } 2821 2822 return (d); 2823 } 2824 2825 /* 2826 * bridge_rtnode_lookup: 2827 * 2828 * Look up a bridge route node for the specified destination. Compare the 2829 * vlan id or if zero then just return the first match. 2830 */ 2831 static struct bridge_rtnode * 2832 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2833 { 2834 struct bridge_rtnode *brt; 2835 uint32_t hash; 2836 int dir; 2837 2838 BRIDGE_LOCK_ASSERT(sc); 2839 2840 hash = bridge_rthash(sc, addr); 2841 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2842 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2843 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2844 return (brt); 2845 if (dir > 0) 2846 return (NULL); 2847 } 2848 2849 return (NULL); 2850 } 2851 2852 /* 2853 * bridge_rtnode_insert: 2854 * 2855 * Insert the specified bridge node into the route table. We 2856 * assume the entry is not already in the table. 2857 */ 2858 static int 2859 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2860 { 2861 struct bridge_rtnode *lbrt; 2862 uint32_t hash; 2863 int dir; 2864 2865 BRIDGE_LOCK_ASSERT(sc); 2866 2867 hash = bridge_rthash(sc, brt->brt_addr); 2868 2869 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2870 if (lbrt == NULL) { 2871 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2872 goto out; 2873 } 2874 2875 do { 2876 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2877 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2878 return (EEXIST); 2879 if (dir > 0) { 2880 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2881 goto out; 2882 } 2883 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2884 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2885 goto out; 2886 } 2887 lbrt = LIST_NEXT(lbrt, brt_hash); 2888 } while (lbrt != NULL); 2889 2890 #ifdef DIAGNOSTIC 2891 panic("bridge_rtnode_insert: impossible"); 2892 #endif 2893 2894 out: 2895 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2896 sc->sc_brtcnt++; 2897 2898 return (0); 2899 } 2900 2901 /* 2902 * bridge_rtnode_destroy: 2903 * 2904 * Destroy a bridge rtnode. 2905 */ 2906 static void 2907 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2908 { 2909 BRIDGE_LOCK_ASSERT(sc); 2910 2911 LIST_REMOVE(brt, brt_hash); 2912 2913 LIST_REMOVE(brt, brt_list); 2914 sc->sc_brtcnt--; 2915 brt->brt_dst->bif_addrcnt--; 2916 uma_zfree(bridge_rtnode_zone, brt); 2917 } 2918 2919 /* 2920 * bridge_rtable_expire: 2921 * 2922 * Set the expiry time for all routes on an interface. 2923 */ 2924 static void 2925 bridge_rtable_expire(struct ifnet *ifp, int age) 2926 { 2927 struct bridge_softc *sc = ifp->if_bridge; 2928 struct bridge_rtnode *brt; 2929 2930 BRIDGE_LOCK(sc); 2931 2932 /* 2933 * If the age is zero then flush, otherwise set all the expiry times to 2934 * age for the interface 2935 */ 2936 if (age == 0) 2937 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2938 else { 2939 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2940 /* Cap the expiry time to 'age' */ 2941 if (brt->brt_ifp == ifp && 2942 brt->brt_expire > time_uptime + age && 2943 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2944 brt->brt_expire = time_uptime + age; 2945 } 2946 } 2947 BRIDGE_UNLOCK(sc); 2948 } 2949 2950 /* 2951 * bridge_state_change: 2952 * 2953 * Callback from the bridgestp code when a port changes states. 2954 */ 2955 static void 2956 bridge_state_change(struct ifnet *ifp, int state) 2957 { 2958 struct bridge_softc *sc = ifp->if_bridge; 2959 static const char *stpstates[] = { 2960 "disabled", 2961 "listening", 2962 "learning", 2963 "forwarding", 2964 "blocking", 2965 "discarding" 2966 }; 2967 2968 if (log_stp) 2969 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2970 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2971 } 2972 2973 /* 2974 * Send bridge packets through pfil if they are one of the types pfil can deal 2975 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2976 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2977 * that interface. 2978 */ 2979 static int 2980 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2981 { 2982 int snap, error, i, hlen; 2983 struct ether_header *eh1, eh2; 2984 struct ip_fw_args args; 2985 struct ip *ip; 2986 struct llc llc1; 2987 u_int16_t ether_type; 2988 2989 snap = 0; 2990 error = -1; /* Default error if not error == 0 */ 2991 2992 #if 0 2993 /* we may return with the IP fields swapped, ensure its not shared */ 2994 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2995 #endif 2996 2997 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2998 return (0); /* filtering is disabled */ 2999 3000 i = min((*mp)->m_pkthdr.len, max_protohdr); 3001 if ((*mp)->m_len < i) { 3002 *mp = m_pullup(*mp, i); 3003 if (*mp == NULL) { 3004 printf("%s: m_pullup failed\n", __func__); 3005 return (-1); 3006 } 3007 } 3008 3009 eh1 = mtod(*mp, struct ether_header *); 3010 ether_type = ntohs(eh1->ether_type); 3011 3012 /* 3013 * Check for SNAP/LLC. 3014 */ 3015 if (ether_type < ETHERMTU) { 3016 struct llc *llc2 = (struct llc *)(eh1 + 1); 3017 3018 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3019 llc2->llc_dsap == LLC_SNAP_LSAP && 3020 llc2->llc_ssap == LLC_SNAP_LSAP && 3021 llc2->llc_control == LLC_UI) { 3022 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3023 snap = 1; 3024 } 3025 } 3026 3027 /* 3028 * If we're trying to filter bridge traffic, don't look at anything 3029 * other than IP and ARP traffic. If the filter doesn't understand 3030 * IPv6, don't allow IPv6 through the bridge either. This is lame 3031 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3032 * but of course we don't have an AppleTalk filter to begin with. 3033 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3034 * ARP traffic.) 3035 */ 3036 switch (ether_type) { 3037 case ETHERTYPE_ARP: 3038 case ETHERTYPE_REVARP: 3039 if (pfil_ipfw_arp == 0) 3040 return (0); /* Automatically pass */ 3041 break; 3042 3043 case ETHERTYPE_IP: 3044 #ifdef INET6 3045 case ETHERTYPE_IPV6: 3046 #endif /* INET6 */ 3047 break; 3048 default: 3049 /* 3050 * Check to see if the user wants to pass non-ip 3051 * packets, these will not be checked by pfil(9) and 3052 * passed unconditionally so the default is to drop. 3053 */ 3054 if (pfil_onlyip) 3055 goto bad; 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 /* XXX this section is also in if_ethersubr.c */ 3089 // XXX PFIL_OUT or DIR_OUT ? 3090 if (V_ip_fw_chk_ptr && pfil_ipfw != 0 && 3091 dir == PFIL_OUT && ifp != NULL) { 3092 struct m_tag *mtag; 3093 3094 error = -1; 3095 /* fetch the start point from existing tags, if any */ 3096 mtag = m_tag_locate(*mp, MTAG_IPFW_RULE, 0, NULL); 3097 if (mtag == NULL) { 3098 args.rule.slot = 0; 3099 } else { 3100 struct ipfw_rule_ref *r; 3101 3102 /* XXX can we free the tag after use ? */ 3103 mtag->m_tag_id = PACKET_TAG_NONE; 3104 r = (struct ipfw_rule_ref *)(mtag + 1); 3105 /* packet already partially processed ? */ 3106 if (r->info & IPFW_ONEPASS) 3107 goto ipfwpass; 3108 args.rule = *r; 3109 } 3110 3111 args.m = *mp; 3112 args.oif = ifp; 3113 args.next_hop = NULL; 3114 args.next_hop6 = NULL; 3115 args.eh = &eh2; 3116 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3117 i = V_ip_fw_chk_ptr(&args); 3118 *mp = args.m; 3119 3120 if (*mp == NULL) 3121 return (error); 3122 3123 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) { 3124 3125 /* put the Ethernet header back on */ 3126 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3127 if (*mp == NULL) 3128 return (error); 3129 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3130 3131 /* 3132 * Pass the pkt to dummynet, which consumes it. The 3133 * packet will return to us via bridge_dummynet(). 3134 */ 3135 args.oif = ifp; 3136 ip_dn_io_ptr(mp, DIR_FWD | PROTO_IFB, &args); 3137 return (error); 3138 } 3139 3140 if (i != IP_FW_PASS) /* drop */ 3141 goto bad; 3142 } 3143 3144 ipfwpass: 3145 error = 0; 3146 3147 /* 3148 * Run the packet through pfil 3149 */ 3150 switch (ether_type) { 3151 case ETHERTYPE_IP: 3152 /* 3153 * before calling the firewall, swap fields the same as 3154 * IP does. here we assume the header is contiguous 3155 */ 3156 ip = mtod(*mp, struct ip *); 3157 3158 ip->ip_len = ntohs(ip->ip_len); 3159 ip->ip_off = ntohs(ip->ip_off); 3160 3161 /* 3162 * Run pfil on the member interface and the bridge, both can 3163 * be skipped by clearing pfil_member or pfil_bridge. 3164 * 3165 * Keep the order: 3166 * in_if -> bridge_if -> out_if 3167 */ 3168 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3169 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3170 dir, NULL); 3171 3172 if (*mp == NULL || error != 0) /* filter may consume */ 3173 break; 3174 3175 if (pfil_member && ifp != NULL) 3176 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3177 dir, NULL); 3178 3179 if (*mp == NULL || error != 0) /* filter may consume */ 3180 break; 3181 3182 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3183 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3184 dir, NULL); 3185 3186 if (*mp == NULL || error != 0) /* filter may consume */ 3187 break; 3188 3189 /* check if we need to fragment the packet */ 3190 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3191 i = (*mp)->m_pkthdr.len; 3192 if (i > ifp->if_mtu) { 3193 error = bridge_fragment(ifp, *mp, &eh2, snap, 3194 &llc1); 3195 return (error); 3196 } 3197 } 3198 3199 /* Recalculate the ip checksum and restore byte ordering */ 3200 ip = mtod(*mp, struct ip *); 3201 hlen = ip->ip_hl << 2; 3202 if (hlen < sizeof(struct ip)) 3203 goto bad; 3204 if (hlen > (*mp)->m_len) { 3205 if ((*mp = m_pullup(*mp, hlen)) == 0) 3206 goto bad; 3207 ip = mtod(*mp, struct ip *); 3208 if (ip == NULL) 3209 goto bad; 3210 } 3211 ip->ip_len = htons(ip->ip_len); 3212 ip->ip_off = htons(ip->ip_off); 3213 ip->ip_sum = 0; 3214 if (hlen == sizeof(struct ip)) 3215 ip->ip_sum = in_cksum_hdr(ip); 3216 else 3217 ip->ip_sum = in_cksum(*mp, hlen); 3218 3219 break; 3220 #ifdef INET6 3221 case ETHERTYPE_IPV6: 3222 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3223 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3224 dir, NULL); 3225 3226 if (*mp == NULL || error != 0) /* filter may consume */ 3227 break; 3228 3229 if (pfil_member && ifp != NULL) 3230 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3231 dir, NULL); 3232 3233 if (*mp == NULL || error != 0) /* filter may consume */ 3234 break; 3235 3236 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3237 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3238 dir, NULL); 3239 break; 3240 #endif 3241 default: 3242 error = 0; 3243 break; 3244 } 3245 3246 if (*mp == NULL) 3247 return (error); 3248 if (error != 0) 3249 goto bad; 3250 3251 error = -1; 3252 3253 /* 3254 * Finally, put everything back the way it was and return 3255 */ 3256 if (snap) { 3257 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3258 if (*mp == NULL) 3259 return (error); 3260 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3261 } 3262 3263 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3264 if (*mp == NULL) 3265 return (error); 3266 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3267 3268 return (0); 3269 3270 bad: 3271 m_freem(*mp); 3272 *mp = NULL; 3273 return (error); 3274 } 3275 3276 /* 3277 * Perform basic checks on header size since 3278 * pfil assumes ip_input has already processed 3279 * it for it. Cut-and-pasted from ip_input.c. 3280 * Given how simple the IPv6 version is, 3281 * does the IPv4 version really need to be 3282 * this complicated? 3283 * 3284 * XXX Should we update ipstat here, or not? 3285 * XXX Right now we update ipstat but not 3286 * XXX csum_counter. 3287 */ 3288 static int 3289 bridge_ip_checkbasic(struct mbuf **mp) 3290 { 3291 struct mbuf *m = *mp; 3292 struct ip *ip; 3293 int len, hlen; 3294 u_short sum; 3295 3296 if (*mp == NULL) 3297 return (-1); 3298 3299 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3300 if ((m = m_copyup(m, sizeof(struct ip), 3301 (max_linkhdr + 3) & ~3)) == NULL) { 3302 /* XXXJRT new stat, please */ 3303 KMOD_IPSTAT_INC(ips_toosmall); 3304 goto bad; 3305 } 3306 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3307 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3308 KMOD_IPSTAT_INC(ips_toosmall); 3309 goto bad; 3310 } 3311 } 3312 ip = mtod(m, struct ip *); 3313 if (ip == NULL) goto bad; 3314 3315 if (ip->ip_v != IPVERSION) { 3316 KMOD_IPSTAT_INC(ips_badvers); 3317 goto bad; 3318 } 3319 hlen = ip->ip_hl << 2; 3320 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3321 KMOD_IPSTAT_INC(ips_badhlen); 3322 goto bad; 3323 } 3324 if (hlen > m->m_len) { 3325 if ((m = m_pullup(m, hlen)) == 0) { 3326 KMOD_IPSTAT_INC(ips_badhlen); 3327 goto bad; 3328 } 3329 ip = mtod(m, struct ip *); 3330 if (ip == NULL) goto bad; 3331 } 3332 3333 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3334 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3335 } else { 3336 if (hlen == sizeof(struct ip)) { 3337 sum = in_cksum_hdr(ip); 3338 } else { 3339 sum = in_cksum(m, hlen); 3340 } 3341 } 3342 if (sum) { 3343 KMOD_IPSTAT_INC(ips_badsum); 3344 goto bad; 3345 } 3346 3347 /* Retrieve the packet length. */ 3348 len = ntohs(ip->ip_len); 3349 3350 /* 3351 * Check for additional length bogosity 3352 */ 3353 if (len < hlen) { 3354 KMOD_IPSTAT_INC(ips_badlen); 3355 goto bad; 3356 } 3357 3358 /* 3359 * Check that the amount of data in the buffers 3360 * is as at least much as the IP header would have us expect. 3361 * Drop packet if shorter than we expect. 3362 */ 3363 if (m->m_pkthdr.len < len) { 3364 KMOD_IPSTAT_INC(ips_tooshort); 3365 goto bad; 3366 } 3367 3368 /* Checks out, proceed */ 3369 *mp = m; 3370 return (0); 3371 3372 bad: 3373 *mp = m; 3374 return (-1); 3375 } 3376 3377 #ifdef INET6 3378 /* 3379 * Same as above, but for IPv6. 3380 * Cut-and-pasted from ip6_input.c. 3381 * XXX Should we update ip6stat, or not? 3382 */ 3383 static int 3384 bridge_ip6_checkbasic(struct mbuf **mp) 3385 { 3386 struct mbuf *m = *mp; 3387 struct ip6_hdr *ip6; 3388 3389 /* 3390 * If the IPv6 header is not aligned, slurp it up into a new 3391 * mbuf with space for link headers, in the event we forward 3392 * it. Otherwise, if it is aligned, make sure the entire base 3393 * IPv6 header is in the first mbuf of the chain. 3394 */ 3395 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3396 struct ifnet *inifp = m->m_pkthdr.rcvif; 3397 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3398 (max_linkhdr + 3) & ~3)) == NULL) { 3399 /* XXXJRT new stat, please */ 3400 V_ip6stat.ip6s_toosmall++; 3401 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3402 goto bad; 3403 } 3404 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3405 struct ifnet *inifp = m->m_pkthdr.rcvif; 3406 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3407 V_ip6stat.ip6s_toosmall++; 3408 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3409 goto bad; 3410 } 3411 } 3412 3413 ip6 = mtod(m, struct ip6_hdr *); 3414 3415 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3416 V_ip6stat.ip6s_badvers++; 3417 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3418 goto bad; 3419 } 3420 3421 /* Checks out, proceed */ 3422 *mp = m; 3423 return (0); 3424 3425 bad: 3426 *mp = m; 3427 return (-1); 3428 } 3429 #endif /* INET6 */ 3430 3431 /* 3432 * bridge_fragment: 3433 * 3434 * Return a fragmented mbuf chain. 3435 */ 3436 static int 3437 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3438 int snap, struct llc *llc) 3439 { 3440 struct mbuf *m0; 3441 struct ip *ip; 3442 int error = -1; 3443 3444 if (m->m_len < sizeof(struct ip) && 3445 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3446 goto out; 3447 ip = mtod(m, struct ip *); 3448 3449 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3450 CSUM_DELAY_IP); 3451 if (error) 3452 goto out; 3453 3454 /* walk the chain and re-add the Ethernet header */ 3455 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3456 if (error == 0) { 3457 if (snap) { 3458 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3459 if (m0 == NULL) { 3460 error = ENOBUFS; 3461 continue; 3462 } 3463 bcopy(llc, mtod(m0, caddr_t), 3464 sizeof(struct llc)); 3465 } 3466 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3467 if (m0 == NULL) { 3468 error = ENOBUFS; 3469 continue; 3470 } 3471 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3472 } else 3473 m_freem(m); 3474 } 3475 3476 if (error == 0) 3477 KMOD_IPSTAT_INC(ips_fragmented); 3478 3479 return (error); 3480 3481 out: 3482 if (m != NULL) 3483 m_freem(m); 3484 return (error); 3485 } 3486 3487 static void 3488 bridge_linkstate(struct ifnet *ifp) 3489 { 3490 struct bridge_softc *sc = ifp->if_bridge; 3491 struct bridge_iflist *bif; 3492 3493 BRIDGE_LOCK(sc); 3494 bif = bridge_lookup_member_if(sc, ifp); 3495 if (bif == NULL) { 3496 BRIDGE_UNLOCK(sc); 3497 return; 3498 } 3499 bridge_linkcheck(sc); 3500 BRIDGE_UNLOCK(sc); 3501 3502 bstp_linkstate(&bif->bif_stp); 3503 } 3504 3505 static void 3506 bridge_linkcheck(struct bridge_softc *sc) 3507 { 3508 struct bridge_iflist *bif; 3509 int new_link, hasls; 3510 3511 BRIDGE_LOCK_ASSERT(sc); 3512 new_link = LINK_STATE_DOWN; 3513 hasls = 0; 3514 /* Our link is considered up if at least one of our ports is active */ 3515 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3516 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3517 hasls++; 3518 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3519 new_link = LINK_STATE_UP; 3520 break; 3521 } 3522 } 3523 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3524 /* If no interfaces support link-state then we default to up */ 3525 new_link = LINK_STATE_UP; 3526 } 3527 if_link_state_change(sc->sc_ifp, new_link); 3528 } 3529