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> 135 136 /* 137 * Size of the route hash table. Must be a power of two. 138 */ 139 #ifndef BRIDGE_RTHASH_SIZE 140 #define BRIDGE_RTHASH_SIZE 1024 141 #endif 142 143 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 144 145 /* 146 * Default maximum number of addresses to cache. 147 */ 148 #ifndef BRIDGE_RTABLE_MAX 149 #define BRIDGE_RTABLE_MAX 2000 150 #endif 151 152 /* 153 * Timeout (in seconds) for entries learned dynamically. 154 */ 155 #ifndef BRIDGE_RTABLE_TIMEOUT 156 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 157 #endif 158 159 /* 160 * Number of seconds between walks of the route list. 161 */ 162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 163 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 164 #endif 165 166 /* 167 * List of capabilities to possibly mask on the member interface. 168 */ 169 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 170 171 /* 172 * List of capabilities to strip 173 */ 174 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 175 176 /* 177 * Bridge interface list entry. 178 */ 179 struct bridge_iflist { 180 LIST_ENTRY(bridge_iflist) bif_next; 181 struct ifnet *bif_ifp; /* member if */ 182 struct bstp_port bif_stp; /* STP state */ 183 uint32_t bif_flags; /* member if flags */ 184 int bif_savedcaps; /* saved capabilities */ 185 uint32_t bif_addrmax; /* max # of addresses */ 186 uint32_t bif_addrcnt; /* cur. # of addresses */ 187 uint32_t bif_addrexceeded;/* # of address violations */ 188 }; 189 190 /* 191 * Bridge route node. 192 */ 193 struct bridge_rtnode { 194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 196 struct bridge_iflist *brt_dst; /* destination if */ 197 unsigned long brt_expire; /* expiration time */ 198 uint8_t brt_flags; /* address flags */ 199 uint8_t brt_addr[ETHER_ADDR_LEN]; 200 uint16_t brt_vlan; /* vlan id */ 201 }; 202 #define brt_ifp brt_dst->bif_ifp 203 204 /* 205 * Software state for each bridge. 206 */ 207 struct bridge_softc { 208 struct ifnet *sc_ifp; /* make this an interface */ 209 LIST_ENTRY(bridge_softc) sc_list; 210 struct mtx sc_mtx; 211 struct cv sc_cv; 212 uint32_t sc_brtmax; /* max # of addresses */ 213 uint32_t sc_brtcnt; /* cur. # of addresses */ 214 uint32_t sc_brttimeout; /* rt timeout in seconds */ 215 struct callout sc_brcallout; /* bridge callout */ 216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 221 uint32_t sc_rthash_key; /* key for hash */ 222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 223 struct bstp_state sc_stp; /* STP state */ 224 uint32_t sc_brtexceeded; /* # of cache drops */ 225 struct ifnet *sc_ifaddr; /* member mac copied from */ 226 u_char sc_defaddr[6]; /* Default MAC address */ 227 }; 228 229 static struct mtx bridge_list_mtx; 230 eventhandler_tag bridge_detach_cookie = NULL; 231 232 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 233 234 uma_zone_t bridge_rtnode_zone; 235 236 static int bridge_clone_create(struct if_clone *, int, caddr_t); 237 static void bridge_clone_destroy(struct ifnet *); 238 239 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 240 static void bridge_mutecaps(struct bridge_softc *); 241 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 242 int); 243 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 244 static void bridge_init(void *); 245 static void bridge_dummynet(struct mbuf *, struct ifnet *); 246 static void bridge_stop(struct ifnet *, int); 247 static void bridge_start(struct ifnet *); 248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 249 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 250 struct rtentry *); 251 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 252 struct mbuf *); 253 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 254 255 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 256 struct mbuf *m); 257 258 static void bridge_timer(void *); 259 260 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 261 struct mbuf *, int); 262 static void bridge_span(struct bridge_softc *, struct mbuf *); 263 264 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 265 uint16_t, struct bridge_iflist *, int, uint8_t); 266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 267 uint16_t); 268 static void bridge_rttrim(struct bridge_softc *); 269 static void bridge_rtage(struct bridge_softc *); 270 static void bridge_rtflush(struct bridge_softc *, int); 271 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 272 uint16_t); 273 274 static int bridge_rtable_init(struct bridge_softc *); 275 static void bridge_rtable_fini(struct bridge_softc *); 276 277 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 279 const uint8_t *, uint16_t); 280 static int bridge_rtnode_insert(struct bridge_softc *, 281 struct bridge_rtnode *); 282 static void bridge_rtnode_destroy(struct bridge_softc *, 283 struct bridge_rtnode *); 284 static void bridge_rtable_expire(struct ifnet *, int); 285 static void bridge_state_change(struct ifnet *, int); 286 287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 288 const char *name); 289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 290 struct ifnet *ifp); 291 static void bridge_delete_member(struct bridge_softc *, 292 struct bridge_iflist *, int); 293 static void bridge_delete_span(struct bridge_softc *, 294 struct bridge_iflist *); 295 296 static int bridge_ioctl_add(struct bridge_softc *, void *); 297 static int bridge_ioctl_del(struct bridge_softc *, void *); 298 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 299 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_scache(struct bridge_softc *, void *); 301 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 303 static int bridge_ioctl_rts(struct bridge_softc *, void *); 304 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 305 static int bridge_ioctl_sto(struct bridge_softc *, void *); 306 static int bridge_ioctl_gto(struct bridge_softc *, void *); 307 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 308 static int bridge_ioctl_flush(struct bridge_softc *, void *); 309 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 310 static int bridge_ioctl_spri(struct bridge_softc *, void *); 311 static int bridge_ioctl_ght(struct bridge_softc *, void *); 312 static int bridge_ioctl_sht(struct bridge_softc *, void *); 313 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 314 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_gma(struct bridge_softc *, void *); 316 static int bridge_ioctl_sma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 320 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 321 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 323 static int bridge_ioctl_grte(struct bridge_softc *, void *); 324 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 325 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 326 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 327 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 328 int); 329 static int bridge_ip_checkbasic(struct mbuf **mp); 330 #ifdef INET6 331 static int bridge_ip6_checkbasic(struct mbuf **mp); 332 #endif /* INET6 */ 333 static int bridge_fragment(struct ifnet *, struct mbuf *, 334 struct ether_header *, int, struct llc *); 335 static void bridge_linkstate(struct ifnet *ifp); 336 337 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 338 339 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 340 #define VLANTAGOF(_m) \ 341 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 342 343 static struct bstp_cb_ops bridge_ops = { 344 .bcb_state = bridge_state_change, 345 .bcb_rtage = bridge_rtable_expire 346 }; 347 348 SYSCTL_DECL(_net_link); 349 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 350 351 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 352 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 353 static int pfil_member = 1; /* run pfil hooks on the member interface */ 354 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 355 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 356 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 357 locally destined packets */ 358 static int log_stp = 0; /* log STP state changes */ 359 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 360 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 362 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 363 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 365 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 366 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 368 &pfil_bridge, 0, "Packet filter on the bridge interface"); 369 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 370 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 371 &pfil_member, 0, "Packet filter on the member interface"); 372 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 373 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 374 &pfil_local_phys, 0, 375 "Packet filter on the physical interface for locally destined packets"); 376 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 377 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 378 &log_stp, 0, "Log STP state changes"); 379 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 380 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 381 &bridge_inherit_mac, 0, 382 "Inherit MAC address from the first bridge member"); 383 384 struct bridge_control { 385 int (*bc_func)(struct bridge_softc *, void *); 386 int bc_argsize; 387 int bc_flags; 388 }; 389 390 #define BC_F_COPYIN 0x01 /* copy arguments in */ 391 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 392 #define BC_F_SUSER 0x04 /* do super-user check */ 393 394 const struct bridge_control bridge_control_table[] = { 395 { bridge_ioctl_add, sizeof(struct ifbreq), 396 BC_F_COPYIN|BC_F_SUSER }, 397 { bridge_ioctl_del, sizeof(struct ifbreq), 398 BC_F_COPYIN|BC_F_SUSER }, 399 400 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 401 BC_F_COPYIN|BC_F_COPYOUT }, 402 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 403 BC_F_COPYIN|BC_F_SUSER }, 404 405 { bridge_ioctl_scache, sizeof(struct ifbrparam), 406 BC_F_COPYIN|BC_F_SUSER }, 407 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 408 BC_F_COPYOUT }, 409 410 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 411 BC_F_COPYIN|BC_F_COPYOUT }, 412 { bridge_ioctl_rts, sizeof(struct ifbaconf), 413 BC_F_COPYIN|BC_F_COPYOUT }, 414 415 { bridge_ioctl_saddr, sizeof(struct ifbareq), 416 BC_F_COPYIN|BC_F_SUSER }, 417 418 { bridge_ioctl_sto, sizeof(struct ifbrparam), 419 BC_F_COPYIN|BC_F_SUSER }, 420 { bridge_ioctl_gto, sizeof(struct ifbrparam), 421 BC_F_COPYOUT }, 422 423 { bridge_ioctl_daddr, sizeof(struct ifbareq), 424 BC_F_COPYIN|BC_F_SUSER }, 425 426 { bridge_ioctl_flush, sizeof(struct ifbreq), 427 BC_F_COPYIN|BC_F_SUSER }, 428 429 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 430 BC_F_COPYOUT }, 431 { bridge_ioctl_spri, sizeof(struct ifbrparam), 432 BC_F_COPYIN|BC_F_SUSER }, 433 434 { bridge_ioctl_ght, sizeof(struct ifbrparam), 435 BC_F_COPYOUT }, 436 { bridge_ioctl_sht, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 439 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 440 BC_F_COPYOUT }, 441 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 442 BC_F_COPYIN|BC_F_SUSER }, 443 444 { bridge_ioctl_gma, sizeof(struct ifbrparam), 445 BC_F_COPYOUT }, 446 { bridge_ioctl_sma, sizeof(struct ifbrparam), 447 BC_F_COPYIN|BC_F_SUSER }, 448 449 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 450 BC_F_COPYIN|BC_F_SUSER }, 451 452 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 453 BC_F_COPYIN|BC_F_SUSER }, 454 455 { bridge_ioctl_addspan, sizeof(struct ifbreq), 456 BC_F_COPYIN|BC_F_SUSER }, 457 { bridge_ioctl_delspan, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 461 BC_F_COPYOUT }, 462 463 { bridge_ioctl_grte, sizeof(struct ifbrparam), 464 BC_F_COPYOUT }, 465 466 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 467 BC_F_COPYIN|BC_F_COPYOUT }, 468 469 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 470 BC_F_COPYIN|BC_F_SUSER }, 471 472 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 473 BC_F_COPYIN|BC_F_SUSER }, 474 475 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 476 BC_F_COPYIN|BC_F_SUSER }, 477 478 }; 479 const int bridge_control_table_size = 480 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 481 482 LIST_HEAD(, bridge_softc) bridge_list; 483 484 IFC_SIMPLE_DECLARE(bridge, 0); 485 486 static int 487 bridge_modevent(module_t mod, int type, void *data) 488 { 489 490 switch (type) { 491 case MOD_LOAD: 492 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 493 if_clone_attach(&bridge_cloner); 494 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 495 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 496 UMA_ALIGN_PTR, 0); 497 LIST_INIT(&bridge_list); 498 bridge_input_p = bridge_input; 499 bridge_output_p = bridge_output; 500 bridge_dn_p = bridge_dummynet; 501 bridge_linkstate_p = bridge_linkstate; 502 bridge_detach_cookie = EVENTHANDLER_REGISTER( 503 ifnet_departure_event, bridge_ifdetach, NULL, 504 EVENTHANDLER_PRI_ANY); 505 break; 506 case MOD_UNLOAD: 507 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 508 bridge_detach_cookie); 509 if_clone_detach(&bridge_cloner); 510 uma_zdestroy(bridge_rtnode_zone); 511 bridge_input_p = NULL; 512 bridge_output_p = NULL; 513 bridge_dn_p = NULL; 514 bridge_linkstate_p = NULL; 515 mtx_destroy(&bridge_list_mtx); 516 break; 517 default: 518 return (EOPNOTSUPP); 519 } 520 return (0); 521 } 522 523 static moduledata_t bridge_mod = { 524 "if_bridge", 525 bridge_modevent, 526 0 527 }; 528 529 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 530 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 531 532 /* 533 * handler for net.link.bridge.pfil_ipfw 534 */ 535 static int 536 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 537 { 538 int enable = pfil_ipfw; 539 int error; 540 541 error = sysctl_handle_int(oidp, &enable, 0, req); 542 enable = (enable) ? 1 : 0; 543 544 if (enable != pfil_ipfw) { 545 pfil_ipfw = enable; 546 547 /* 548 * Disable pfil so that ipfw doesnt run twice, if the user 549 * really wants both then they can re-enable pfil_bridge and/or 550 * pfil_member. Also allow non-ip packets as ipfw can filter by 551 * layer2 type. 552 */ 553 if (pfil_ipfw) { 554 pfil_onlyip = 0; 555 pfil_bridge = 0; 556 pfil_member = 0; 557 } 558 } 559 560 return (error); 561 } 562 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 563 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 564 565 /* 566 * bridge_clone_create: 567 * 568 * Create a new bridge instance. 569 */ 570 static int 571 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 572 { 573 struct bridge_softc *sc, *sc2; 574 struct ifnet *bifp, *ifp; 575 int fb, retry; 576 unsigned long hostid; 577 578 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 579 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 580 if (ifp == NULL) { 581 free(sc, M_DEVBUF); 582 return (ENOSPC); 583 } 584 585 BRIDGE_LOCK_INIT(sc); 586 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 587 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 588 589 /* Initialize our routing table. */ 590 bridge_rtable_init(sc); 591 592 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 593 594 LIST_INIT(&sc->sc_iflist); 595 LIST_INIT(&sc->sc_spanlist); 596 597 ifp->if_softc = sc; 598 if_initname(ifp, ifc->ifc_name, unit); 599 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 600 ifp->if_ioctl = bridge_ioctl; 601 ifp->if_start = bridge_start; 602 ifp->if_init = bridge_init; 603 ifp->if_type = IFT_BRIDGE; 604 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 605 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 606 IFQ_SET_READY(&ifp->if_snd); 607 608 /* 609 * Generate an ethernet address with a locally administered address. 610 * 611 * Since we are using random ethernet addresses for the bridge, it is 612 * possible that we might have address collisions, so make sure that 613 * this hardware address isn't already in use on another bridge. 614 * The first try uses the hostid and falls back to arc4rand(). 615 */ 616 fb = 0; 617 getcredhostid(curthread->td_ucred, &hostid); 618 for (retry = 1; retry != 0;) { 619 if (fb || hostid == 0) { 620 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 621 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 622 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 623 } else { 624 sc->sc_defaddr[0] = 0x2; 625 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 626 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 627 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 628 sc->sc_defaddr[4] = hostid & 0xff; 629 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 630 } 631 632 fb = 1; 633 retry = 0; 634 mtx_lock(&bridge_list_mtx); 635 LIST_FOREACH(sc2, &bridge_list, sc_list) { 636 bifp = sc2->sc_ifp; 637 if (memcmp(sc->sc_defaddr, 638 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 639 retry = 1; 640 } 641 mtx_unlock(&bridge_list_mtx); 642 } 643 644 bstp_attach(&sc->sc_stp, &bridge_ops); 645 ether_ifattach(ifp, sc->sc_defaddr); 646 /* Now undo some of the damage... */ 647 ifp->if_baudrate = 0; 648 ifp->if_type = IFT_BRIDGE; 649 650 mtx_lock(&bridge_list_mtx); 651 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 652 mtx_unlock(&bridge_list_mtx); 653 654 return (0); 655 } 656 657 /* 658 * bridge_clone_destroy: 659 * 660 * Destroy a bridge instance. 661 */ 662 static void 663 bridge_clone_destroy(struct ifnet *ifp) 664 { 665 struct bridge_softc *sc = ifp->if_softc; 666 struct bridge_iflist *bif; 667 668 BRIDGE_LOCK(sc); 669 670 bridge_stop(ifp, 1); 671 ifp->if_flags &= ~IFF_UP; 672 673 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 674 bridge_delete_member(sc, bif, 0); 675 676 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 677 bridge_delete_span(sc, bif); 678 } 679 680 BRIDGE_UNLOCK(sc); 681 682 callout_drain(&sc->sc_brcallout); 683 684 mtx_lock(&bridge_list_mtx); 685 LIST_REMOVE(sc, sc_list); 686 mtx_unlock(&bridge_list_mtx); 687 688 bstp_detach(&sc->sc_stp); 689 ether_ifdetach(ifp); 690 if_free(ifp); 691 692 /* Tear down the routing table. */ 693 bridge_rtable_fini(sc); 694 695 BRIDGE_LOCK_DESTROY(sc); 696 free(sc, M_DEVBUF); 697 } 698 699 /* 700 * bridge_ioctl: 701 * 702 * Handle a control request from the operator. 703 */ 704 static int 705 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 706 { 707 struct bridge_softc *sc = ifp->if_softc; 708 struct ifreq *ifr = (struct ifreq *)data; 709 struct bridge_iflist *bif; 710 struct thread *td = curthread; 711 union { 712 struct ifbreq ifbreq; 713 struct ifbifconf ifbifconf; 714 struct ifbareq ifbareq; 715 struct ifbaconf ifbaconf; 716 struct ifbrparam ifbrparam; 717 struct ifbropreq ifbropreq; 718 } args; 719 struct ifdrv *ifd = (struct ifdrv *) data; 720 const struct bridge_control *bc; 721 int error = 0; 722 723 switch (cmd) { 724 725 case SIOCADDMULTI: 726 case SIOCDELMULTI: 727 break; 728 729 case SIOCGDRVSPEC: 730 case SIOCSDRVSPEC: 731 if (ifd->ifd_cmd >= bridge_control_table_size) { 732 error = EINVAL; 733 break; 734 } 735 bc = &bridge_control_table[ifd->ifd_cmd]; 736 737 if (cmd == SIOCGDRVSPEC && 738 (bc->bc_flags & BC_F_COPYOUT) == 0) { 739 error = EINVAL; 740 break; 741 } 742 else if (cmd == SIOCSDRVSPEC && 743 (bc->bc_flags & BC_F_COPYOUT) != 0) { 744 error = EINVAL; 745 break; 746 } 747 748 if (bc->bc_flags & BC_F_SUSER) { 749 error = priv_check(td, PRIV_NET_BRIDGE); 750 if (error) 751 break; 752 } 753 754 if (ifd->ifd_len != bc->bc_argsize || 755 ifd->ifd_len > sizeof(args)) { 756 error = EINVAL; 757 break; 758 } 759 760 bzero(&args, sizeof(args)); 761 if (bc->bc_flags & BC_F_COPYIN) { 762 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 763 if (error) 764 break; 765 } 766 767 BRIDGE_LOCK(sc); 768 error = (*bc->bc_func)(sc, &args); 769 BRIDGE_UNLOCK(sc); 770 if (error) 771 break; 772 773 if (bc->bc_flags & BC_F_COPYOUT) 774 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 775 776 break; 777 778 case SIOCSIFFLAGS: 779 if (!(ifp->if_flags & IFF_UP) && 780 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 781 /* 782 * If interface is marked down and it is running, 783 * then stop and disable it. 784 */ 785 BRIDGE_LOCK(sc); 786 bridge_stop(ifp, 1); 787 BRIDGE_UNLOCK(sc); 788 } else if ((ifp->if_flags & IFF_UP) && 789 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 790 /* 791 * If interface is marked up and it is stopped, then 792 * start it. 793 */ 794 (*ifp->if_init)(sc); 795 } 796 break; 797 798 case SIOCSIFMTU: 799 if (ifr->ifr_mtu < 576) { 800 error = EINVAL; 801 break; 802 } 803 if (LIST_EMPTY(&sc->sc_iflist)) { 804 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 805 break; 806 } 807 BRIDGE_LOCK(sc); 808 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 809 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 810 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 811 " != %d\n", sc->sc_ifp->if_xname, 812 bif->bif_ifp->if_mtu, 813 bif->bif_ifp->if_xname, ifr->ifr_mtu); 814 error = EINVAL; 815 break; 816 } 817 } 818 if (!error) 819 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 820 BRIDGE_UNLOCK(sc); 821 break; 822 default: 823 /* 824 * drop the lock as ether_ioctl() will call bridge_start() and 825 * cause the lock to be recursed. 826 */ 827 error = ether_ioctl(ifp, cmd, data); 828 break; 829 } 830 831 return (error); 832 } 833 834 /* 835 * bridge_mutecaps: 836 * 837 * Clear or restore unwanted capabilities on the member interface 838 */ 839 static void 840 bridge_mutecaps(struct bridge_softc *sc) 841 { 842 struct bridge_iflist *bif; 843 int enabled, mask; 844 845 /* Initial bitmask of capabilities to test */ 846 mask = BRIDGE_IFCAPS_MASK; 847 848 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 849 /* Every member must support it or its disabled */ 850 mask &= bif->bif_savedcaps; 851 } 852 853 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 854 enabled = bif->bif_ifp->if_capenable; 855 enabled &= ~BRIDGE_IFCAPS_STRIP; 856 /* strip off mask bits and enable them again if allowed */ 857 enabled &= ~BRIDGE_IFCAPS_MASK; 858 enabled |= mask; 859 bridge_set_ifcap(sc, bif, enabled); 860 } 861 862 } 863 864 static void 865 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 866 { 867 struct ifnet *ifp = bif->bif_ifp; 868 struct ifreq ifr; 869 int error; 870 871 bzero(&ifr, sizeof(ifr)); 872 ifr.ifr_reqcap = set; 873 874 if (ifp->if_capenable != set) { 875 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 876 if (error) 877 if_printf(sc->sc_ifp, 878 "error setting interface capabilities on %s\n", 879 ifp->if_xname); 880 } 881 } 882 883 /* 884 * bridge_lookup_member: 885 * 886 * Lookup a bridge member interface. 887 */ 888 static struct bridge_iflist * 889 bridge_lookup_member(struct bridge_softc *sc, const char *name) 890 { 891 struct bridge_iflist *bif; 892 struct ifnet *ifp; 893 894 BRIDGE_LOCK_ASSERT(sc); 895 896 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 897 ifp = bif->bif_ifp; 898 if (strcmp(ifp->if_xname, name) == 0) 899 return (bif); 900 } 901 902 return (NULL); 903 } 904 905 /* 906 * bridge_lookup_member_if: 907 * 908 * Lookup a bridge member interface by ifnet*. 909 */ 910 static struct bridge_iflist * 911 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 912 { 913 struct bridge_iflist *bif; 914 915 BRIDGE_LOCK_ASSERT(sc); 916 917 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 918 if (bif->bif_ifp == member_ifp) 919 return (bif); 920 } 921 922 return (NULL); 923 } 924 925 /* 926 * bridge_delete_member: 927 * 928 * Delete the specified member interface. 929 */ 930 static void 931 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 932 int gone) 933 { 934 struct ifnet *ifs = bif->bif_ifp; 935 struct ifnet *fif = NULL; 936 937 BRIDGE_LOCK_ASSERT(sc); 938 939 if (bif->bif_flags & IFBIF_STP) 940 bstp_disable(&bif->bif_stp); 941 942 ifs->if_bridge = NULL; 943 BRIDGE_XLOCK(sc); 944 LIST_REMOVE(bif, bif_next); 945 BRIDGE_XDROP(sc); 946 947 /* 948 * If removing the interface that gave the bridge its mac address, set 949 * the mac address of the bridge to the address of the next member, or 950 * to its default address if no members are left. 951 */ 952 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 953 if (LIST_EMPTY(&sc->sc_iflist)) { 954 bcopy(sc->sc_defaddr, 955 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 956 sc->sc_ifaddr = NULL; 957 } else { 958 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 959 bcopy(IF_LLADDR(fif), 960 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 961 sc->sc_ifaddr = fif; 962 } 963 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 964 } 965 966 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 967 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 968 KASSERT(bif->bif_addrcnt == 0, 969 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 970 971 BRIDGE_UNLOCK(sc); 972 if (!gone) { 973 switch (ifs->if_type) { 974 case IFT_ETHER: 975 case IFT_L2VLAN: 976 /* 977 * Take the interface out of promiscuous mode. 978 */ 979 (void) ifpromisc(ifs, 0); 980 break; 981 982 case IFT_GIF: 983 break; 984 985 default: 986 #ifdef DIAGNOSTIC 987 panic("bridge_delete_member: impossible"); 988 #endif 989 break; 990 } 991 /* reneable any interface capabilities */ 992 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 993 } 994 bstp_destroy(&bif->bif_stp); /* prepare to free */ 995 bridge_linkstate(ifs); 996 BRIDGE_LOCK(sc); 997 free(bif, M_DEVBUF); 998 } 999 1000 /* 1001 * bridge_delete_span: 1002 * 1003 * Delete the specified span interface. 1004 */ 1005 static void 1006 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1007 { 1008 BRIDGE_LOCK_ASSERT(sc); 1009 1010 KASSERT(bif->bif_ifp->if_bridge == NULL, 1011 ("%s: not a span interface", __func__)); 1012 1013 LIST_REMOVE(bif, bif_next); 1014 free(bif, M_DEVBUF); 1015 } 1016 1017 static int 1018 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1019 { 1020 struct ifbreq *req = arg; 1021 struct bridge_iflist *bif = NULL; 1022 struct ifnet *ifs; 1023 int error = 0; 1024 1025 ifs = ifunit(req->ifbr_ifsname); 1026 if (ifs == NULL) 1027 return (ENOENT); 1028 if (ifs->if_ioctl == NULL) /* must be supported */ 1029 return (EINVAL); 1030 1031 /* If it's in the span list, it can't be a member. */ 1032 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1033 if (ifs == bif->bif_ifp) 1034 return (EBUSY); 1035 1036 if (ifs->if_bridge == sc) 1037 return (EEXIST); 1038 1039 if (ifs->if_bridge != NULL) 1040 return (EBUSY); 1041 1042 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1043 if (bif == NULL) 1044 return (ENOMEM); 1045 1046 bif->bif_ifp = ifs; 1047 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1048 bif->bif_savedcaps = ifs->if_capenable; 1049 1050 switch (ifs->if_type) { 1051 case IFT_ETHER: 1052 case IFT_L2VLAN: 1053 case IFT_GIF: 1054 /* permitted interface types */ 1055 break; 1056 default: 1057 error = EINVAL; 1058 goto out; 1059 } 1060 1061 /* Allow the first Ethernet member to define the MTU */ 1062 if (LIST_EMPTY(&sc->sc_iflist)) 1063 sc->sc_ifp->if_mtu = ifs->if_mtu; 1064 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1065 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1066 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1067 error = EINVAL; 1068 goto out; 1069 } 1070 1071 /* 1072 * Assign the interface's MAC address to the bridge if it's the first 1073 * member and the MAC address of the bridge has not been changed from 1074 * the default randomly generated one. 1075 */ 1076 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1077 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1078 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1079 sc->sc_ifaddr = ifs; 1080 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1081 } 1082 1083 ifs->if_bridge = sc; 1084 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1085 /* 1086 * XXX: XLOCK HERE!?! 1087 * 1088 * NOTE: insert_***HEAD*** should be safe for the traversals. 1089 */ 1090 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1091 1092 /* Set interface capabilities to the intersection set of all members */ 1093 bridge_mutecaps(sc); 1094 1095 BRIDGE_UNLOCK(sc); 1096 /* Update the linkstate for the bridge */ 1097 bridge_linkstate(ifs); 1098 /* Place the interface into promiscuous mode */ 1099 switch (ifs->if_type) { 1100 case IFT_ETHER: 1101 case IFT_L2VLAN: 1102 error = ifpromisc(ifs, 1); 1103 break; 1104 } 1105 BRIDGE_LOCK(sc); 1106 if (error) 1107 bridge_delete_member(sc, bif, 0); 1108 out: 1109 if (error) { 1110 if (bif != NULL) 1111 free(bif, M_DEVBUF); 1112 } 1113 return (error); 1114 } 1115 1116 static int 1117 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1118 { 1119 struct ifbreq *req = arg; 1120 struct bridge_iflist *bif; 1121 1122 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1123 if (bif == NULL) 1124 return (ENOENT); 1125 1126 bridge_delete_member(sc, bif, 0); 1127 1128 return (0); 1129 } 1130 1131 static int 1132 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1133 { 1134 struct ifbreq *req = arg; 1135 struct bridge_iflist *bif; 1136 struct bstp_port *bp; 1137 1138 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1139 if (bif == NULL) 1140 return (ENOENT); 1141 1142 bp = &bif->bif_stp; 1143 req->ifbr_ifsflags = bif->bif_flags; 1144 req->ifbr_state = bp->bp_state; 1145 req->ifbr_priority = bp->bp_priority; 1146 req->ifbr_path_cost = bp->bp_path_cost; 1147 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1148 req->ifbr_proto = bp->bp_protover; 1149 req->ifbr_role = bp->bp_role; 1150 req->ifbr_stpflags = bp->bp_flags; 1151 req->ifbr_addrcnt = bif->bif_addrcnt; 1152 req->ifbr_addrmax = bif->bif_addrmax; 1153 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1154 1155 /* Copy STP state options as flags */ 1156 if (bp->bp_operedge) 1157 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1158 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1159 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1160 if (bp->bp_ptp_link) 1161 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1162 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1163 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1164 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1165 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1166 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1167 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1168 return (0); 1169 } 1170 1171 static int 1172 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1173 { 1174 struct ifbreq *req = arg; 1175 struct bridge_iflist *bif; 1176 struct bstp_port *bp; 1177 int error; 1178 1179 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1180 if (bif == NULL) 1181 return (ENOENT); 1182 bp = &bif->bif_stp; 1183 1184 if (req->ifbr_ifsflags & IFBIF_SPAN) 1185 /* SPAN is readonly */ 1186 return (EINVAL); 1187 1188 if (req->ifbr_ifsflags & IFBIF_STP) { 1189 if ((bif->bif_flags & IFBIF_STP) == 0) { 1190 error = bstp_enable(&bif->bif_stp); 1191 if (error) 1192 return (error); 1193 } 1194 } else { 1195 if ((bif->bif_flags & IFBIF_STP) != 0) 1196 bstp_disable(&bif->bif_stp); 1197 } 1198 1199 /* Pass on STP flags */ 1200 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1201 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1202 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1203 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1204 1205 /* Save the bits relating to the bridge */ 1206 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1207 1208 return (0); 1209 } 1210 1211 static int 1212 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1213 { 1214 struct ifbrparam *param = arg; 1215 1216 sc->sc_brtmax = param->ifbrp_csize; 1217 bridge_rttrim(sc); 1218 1219 return (0); 1220 } 1221 1222 static int 1223 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1224 { 1225 struct ifbrparam *param = arg; 1226 1227 param->ifbrp_csize = sc->sc_brtmax; 1228 1229 return (0); 1230 } 1231 1232 static int 1233 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1234 { 1235 struct ifbifconf *bifc = arg; 1236 struct bridge_iflist *bif; 1237 struct ifbreq breq; 1238 char *buf, *outbuf; 1239 int count, buflen, len, error = 0; 1240 1241 count = 0; 1242 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1243 count++; 1244 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1245 count++; 1246 1247 buflen = sizeof(breq) * count; 1248 if (bifc->ifbic_len == 0) { 1249 bifc->ifbic_len = buflen; 1250 return (0); 1251 } 1252 BRIDGE_UNLOCK(sc); 1253 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1254 BRIDGE_LOCK(sc); 1255 1256 count = 0; 1257 buf = outbuf; 1258 len = min(bifc->ifbic_len, buflen); 1259 bzero(&breq, sizeof(breq)); 1260 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1261 if (len < sizeof(breq)) 1262 break; 1263 1264 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1265 sizeof(breq.ifbr_ifsname)); 1266 /* Fill in the ifbreq structure */ 1267 error = bridge_ioctl_gifflags(sc, &breq); 1268 if (error) 1269 break; 1270 memcpy(buf, &breq, sizeof(breq)); 1271 count++; 1272 buf += sizeof(breq); 1273 len -= sizeof(breq); 1274 } 1275 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1276 if (len < sizeof(breq)) 1277 break; 1278 1279 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1280 sizeof(breq.ifbr_ifsname)); 1281 breq.ifbr_ifsflags = bif->bif_flags; 1282 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1283 memcpy(buf, &breq, sizeof(breq)); 1284 count++; 1285 buf += sizeof(breq); 1286 len -= sizeof(breq); 1287 } 1288 1289 BRIDGE_UNLOCK(sc); 1290 bifc->ifbic_len = sizeof(breq) * count; 1291 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1292 BRIDGE_LOCK(sc); 1293 free(outbuf, M_TEMP); 1294 return (error); 1295 } 1296 1297 static int 1298 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1299 { 1300 struct ifbaconf *bac = arg; 1301 struct bridge_rtnode *brt; 1302 struct ifbareq bareq; 1303 char *buf, *outbuf; 1304 int count, buflen, len, error = 0; 1305 1306 if (bac->ifbac_len == 0) 1307 return (0); 1308 1309 count = 0; 1310 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1311 count++; 1312 buflen = sizeof(bareq) * count; 1313 1314 BRIDGE_UNLOCK(sc); 1315 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1316 BRIDGE_LOCK(sc); 1317 1318 count = 0; 1319 buf = outbuf; 1320 len = min(bac->ifbac_len, buflen); 1321 bzero(&bareq, sizeof(bareq)); 1322 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1323 if (len < sizeof(bareq)) 1324 goto out; 1325 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1326 sizeof(bareq.ifba_ifsname)); 1327 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1328 bareq.ifba_vlan = brt->brt_vlan; 1329 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1330 time_uptime < brt->brt_expire) 1331 bareq.ifba_expire = brt->brt_expire - time_uptime; 1332 else 1333 bareq.ifba_expire = 0; 1334 bareq.ifba_flags = brt->brt_flags; 1335 1336 memcpy(buf, &bareq, sizeof(bareq)); 1337 count++; 1338 buf += sizeof(bareq); 1339 len -= sizeof(bareq); 1340 } 1341 out: 1342 BRIDGE_UNLOCK(sc); 1343 bac->ifbac_len = sizeof(bareq) * count; 1344 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1345 BRIDGE_LOCK(sc); 1346 free(outbuf, M_TEMP); 1347 return (error); 1348 } 1349 1350 static int 1351 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1352 { 1353 struct ifbareq *req = arg; 1354 struct bridge_iflist *bif; 1355 int error; 1356 1357 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1358 if (bif == NULL) 1359 return (ENOENT); 1360 1361 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1362 req->ifba_flags); 1363 1364 return (error); 1365 } 1366 1367 static int 1368 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1369 { 1370 struct ifbrparam *param = arg; 1371 1372 sc->sc_brttimeout = param->ifbrp_ctime; 1373 return (0); 1374 } 1375 1376 static int 1377 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1378 { 1379 struct ifbrparam *param = arg; 1380 1381 param->ifbrp_ctime = sc->sc_brttimeout; 1382 return (0); 1383 } 1384 1385 static int 1386 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1387 { 1388 struct ifbareq *req = arg; 1389 1390 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1391 } 1392 1393 static int 1394 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1395 { 1396 struct ifbreq *req = arg; 1397 1398 bridge_rtflush(sc, req->ifbr_ifsflags); 1399 return (0); 1400 } 1401 1402 static int 1403 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1404 { 1405 struct ifbrparam *param = arg; 1406 struct bstp_state *bs = &sc->sc_stp; 1407 1408 param->ifbrp_prio = bs->bs_bridge_priority; 1409 return (0); 1410 } 1411 1412 static int 1413 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1414 { 1415 struct ifbrparam *param = arg; 1416 1417 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1418 } 1419 1420 static int 1421 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1422 { 1423 struct ifbrparam *param = arg; 1424 struct bstp_state *bs = &sc->sc_stp; 1425 1426 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1427 return (0); 1428 } 1429 1430 static int 1431 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1432 { 1433 struct ifbrparam *param = arg; 1434 1435 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1436 } 1437 1438 static int 1439 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1440 { 1441 struct ifbrparam *param = arg; 1442 struct bstp_state *bs = &sc->sc_stp; 1443 1444 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1445 return (0); 1446 } 1447 1448 static int 1449 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1450 { 1451 struct ifbrparam *param = arg; 1452 1453 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1454 } 1455 1456 static int 1457 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1458 { 1459 struct ifbrparam *param = arg; 1460 struct bstp_state *bs = &sc->sc_stp; 1461 1462 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1463 return (0); 1464 } 1465 1466 static int 1467 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1468 { 1469 struct ifbrparam *param = arg; 1470 1471 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1472 } 1473 1474 static int 1475 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1476 { 1477 struct ifbreq *req = arg; 1478 struct bridge_iflist *bif; 1479 1480 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1481 if (bif == NULL) 1482 return (ENOENT); 1483 1484 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1485 } 1486 1487 static int 1488 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1489 { 1490 struct ifbreq *req = arg; 1491 struct bridge_iflist *bif; 1492 1493 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1494 if (bif == NULL) 1495 return (ENOENT); 1496 1497 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1498 } 1499 1500 static int 1501 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1502 { 1503 struct ifbreq *req = arg; 1504 struct bridge_iflist *bif; 1505 1506 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1507 if (bif == NULL) 1508 return (ENOENT); 1509 1510 bif->bif_addrmax = req->ifbr_addrmax; 1511 return (0); 1512 } 1513 1514 static int 1515 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1516 { 1517 struct ifbreq *req = arg; 1518 struct bridge_iflist *bif = NULL; 1519 struct ifnet *ifs; 1520 1521 ifs = ifunit(req->ifbr_ifsname); 1522 if (ifs == NULL) 1523 return (ENOENT); 1524 1525 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1526 if (ifs == bif->bif_ifp) 1527 return (EBUSY); 1528 1529 if (ifs->if_bridge != NULL) 1530 return (EBUSY); 1531 1532 switch (ifs->if_type) { 1533 case IFT_ETHER: 1534 case IFT_GIF: 1535 case IFT_L2VLAN: 1536 break; 1537 default: 1538 return (EINVAL); 1539 } 1540 1541 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1542 if (bif == NULL) 1543 return (ENOMEM); 1544 1545 bif->bif_ifp = ifs; 1546 bif->bif_flags = IFBIF_SPAN; 1547 1548 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1549 1550 return (0); 1551 } 1552 1553 static int 1554 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1555 { 1556 struct ifbreq *req = arg; 1557 struct bridge_iflist *bif; 1558 struct ifnet *ifs; 1559 1560 ifs = ifunit(req->ifbr_ifsname); 1561 if (ifs == NULL) 1562 return (ENOENT); 1563 1564 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1565 if (ifs == bif->bif_ifp) 1566 break; 1567 1568 if (bif == NULL) 1569 return (ENOENT); 1570 1571 bridge_delete_span(sc, bif); 1572 1573 return (0); 1574 } 1575 1576 static int 1577 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1578 { 1579 struct ifbropreq *req = arg; 1580 struct bstp_state *bs = &sc->sc_stp; 1581 struct bstp_port *root_port; 1582 1583 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1584 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1585 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1586 1587 root_port = bs->bs_root_port; 1588 if (root_port == NULL) 1589 req->ifbop_root_port = 0; 1590 else 1591 req->ifbop_root_port = root_port->bp_ifp->if_index; 1592 1593 req->ifbop_holdcount = bs->bs_txholdcount; 1594 req->ifbop_priority = bs->bs_bridge_priority; 1595 req->ifbop_protocol = bs->bs_protover; 1596 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1597 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1598 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1599 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1600 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1601 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1602 1603 return (0); 1604 } 1605 1606 static int 1607 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1608 { 1609 struct ifbrparam *param = arg; 1610 1611 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1612 return (0); 1613 } 1614 1615 static int 1616 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1617 { 1618 struct ifbpstpconf *bifstp = arg; 1619 struct bridge_iflist *bif; 1620 struct bstp_port *bp; 1621 struct ifbpstpreq bpreq; 1622 char *buf, *outbuf; 1623 int count, buflen, len, error = 0; 1624 1625 count = 0; 1626 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1627 if ((bif->bif_flags & IFBIF_STP) != 0) 1628 count++; 1629 } 1630 1631 buflen = sizeof(bpreq) * count; 1632 if (bifstp->ifbpstp_len == 0) { 1633 bifstp->ifbpstp_len = buflen; 1634 return (0); 1635 } 1636 1637 BRIDGE_UNLOCK(sc); 1638 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1639 BRIDGE_LOCK(sc); 1640 1641 count = 0; 1642 buf = outbuf; 1643 len = min(bifstp->ifbpstp_len, buflen); 1644 bzero(&bpreq, sizeof(bpreq)); 1645 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1646 if (len < sizeof(bpreq)) 1647 break; 1648 1649 if ((bif->bif_flags & IFBIF_STP) == 0) 1650 continue; 1651 1652 bp = &bif->bif_stp; 1653 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1654 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1655 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1656 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1657 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1658 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1659 1660 memcpy(buf, &bpreq, sizeof(bpreq)); 1661 count++; 1662 buf += sizeof(bpreq); 1663 len -= sizeof(bpreq); 1664 } 1665 1666 BRIDGE_UNLOCK(sc); 1667 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1668 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1669 BRIDGE_LOCK(sc); 1670 free(outbuf, M_TEMP); 1671 return (error); 1672 } 1673 1674 static int 1675 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1676 { 1677 struct ifbrparam *param = arg; 1678 1679 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1680 } 1681 1682 static int 1683 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1684 { 1685 struct ifbrparam *param = arg; 1686 1687 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1688 } 1689 1690 /* 1691 * bridge_ifdetach: 1692 * 1693 * Detach an interface from a bridge. Called when a member 1694 * interface is detaching. 1695 */ 1696 static void 1697 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1698 { 1699 struct bridge_softc *sc = ifp->if_bridge; 1700 struct bridge_iflist *bif; 1701 1702 /* Check if the interface is a bridge member */ 1703 if (sc != NULL) { 1704 BRIDGE_LOCK(sc); 1705 1706 bif = bridge_lookup_member_if(sc, ifp); 1707 if (bif != NULL) 1708 bridge_delete_member(sc, bif, 1); 1709 1710 BRIDGE_UNLOCK(sc); 1711 return; 1712 } 1713 1714 /* Check if the interface is a span port */ 1715 mtx_lock(&bridge_list_mtx); 1716 LIST_FOREACH(sc, &bridge_list, sc_list) { 1717 BRIDGE_LOCK(sc); 1718 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1719 if (ifp == bif->bif_ifp) { 1720 bridge_delete_span(sc, bif); 1721 break; 1722 } 1723 1724 BRIDGE_UNLOCK(sc); 1725 } 1726 mtx_unlock(&bridge_list_mtx); 1727 } 1728 1729 /* 1730 * bridge_init: 1731 * 1732 * Initialize a bridge interface. 1733 */ 1734 static void 1735 bridge_init(void *xsc) 1736 { 1737 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1738 struct ifnet *ifp = sc->sc_ifp; 1739 1740 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1741 return; 1742 1743 BRIDGE_LOCK(sc); 1744 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1745 bridge_timer, sc); 1746 1747 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1748 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1749 1750 BRIDGE_UNLOCK(sc); 1751 } 1752 1753 /* 1754 * bridge_stop: 1755 * 1756 * Stop the bridge interface. 1757 */ 1758 static void 1759 bridge_stop(struct ifnet *ifp, int disable) 1760 { 1761 struct bridge_softc *sc = ifp->if_softc; 1762 1763 BRIDGE_LOCK_ASSERT(sc); 1764 1765 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1766 return; 1767 1768 callout_stop(&sc->sc_brcallout); 1769 bstp_stop(&sc->sc_stp); 1770 1771 bridge_rtflush(sc, IFBF_FLUSHDYN); 1772 1773 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1774 } 1775 1776 /* 1777 * bridge_enqueue: 1778 * 1779 * Enqueue a packet on a bridge member interface. 1780 * 1781 */ 1782 static void 1783 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1784 { 1785 int len, err = 0; 1786 short mflags; 1787 struct mbuf *m0; 1788 1789 len = m->m_pkthdr.len; 1790 mflags = m->m_flags; 1791 1792 /* We may be sending a fragment so traverse the mbuf */ 1793 for (; m; m = m0) { 1794 m0 = m->m_nextpkt; 1795 m->m_nextpkt = NULL; 1796 1797 /* 1798 * If underlying interface can not do VLAN tag insertion itself 1799 * then attach a packet tag that holds it. 1800 */ 1801 if ((m->m_flags & M_VLANTAG) && 1802 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1803 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1804 if (m == NULL) { 1805 if_printf(dst_ifp, 1806 "unable to prepend VLAN header\n"); 1807 dst_ifp->if_oerrors++; 1808 continue; 1809 } 1810 m->m_flags &= ~M_VLANTAG; 1811 } 1812 1813 if (err == 0) 1814 dst_ifp->if_transmit(dst_ifp, m); 1815 } 1816 1817 if (err == 0) { 1818 sc->sc_ifp->if_opackets++; 1819 sc->sc_ifp->if_obytes += len; 1820 if (mflags & M_MCAST) 1821 sc->sc_ifp->if_omcasts++; 1822 } 1823 } 1824 1825 /* 1826 * bridge_dummynet: 1827 * 1828 * Receive a queued packet from dummynet and pass it on to the output 1829 * interface. 1830 * 1831 * The mbuf has the Ethernet header already attached. 1832 */ 1833 static void 1834 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1835 { 1836 struct bridge_softc *sc; 1837 1838 sc = ifp->if_bridge; 1839 1840 /* 1841 * The packet didnt originate from a member interface. This should only 1842 * ever happen if a member interface is removed while packets are 1843 * queued for it. 1844 */ 1845 if (sc == NULL) { 1846 m_freem(m); 1847 return; 1848 } 1849 1850 if (PFIL_HOOKED(&V_inet_pfil_hook) 1851 #ifdef INET6 1852 || PFIL_HOOKED(&V_inet6_pfil_hook) 1853 #endif 1854 ) { 1855 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1856 return; 1857 if (m == NULL) 1858 return; 1859 } 1860 1861 bridge_enqueue(sc, ifp, m); 1862 } 1863 1864 /* 1865 * bridge_output: 1866 * 1867 * Send output from a bridge member interface. This 1868 * performs the bridging function for locally originated 1869 * packets. 1870 * 1871 * The mbuf has the Ethernet header already attached. We must 1872 * enqueue or free the mbuf before returning. 1873 */ 1874 static int 1875 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1876 struct rtentry *rt) 1877 { 1878 struct ether_header *eh; 1879 struct ifnet *dst_if; 1880 struct bridge_softc *sc; 1881 uint16_t vlan; 1882 1883 if (m->m_len < ETHER_HDR_LEN) { 1884 m = m_pullup(m, ETHER_HDR_LEN); 1885 if (m == NULL) 1886 return (0); 1887 } 1888 1889 eh = mtod(m, struct ether_header *); 1890 sc = ifp->if_bridge; 1891 vlan = VLANTAGOF(m); 1892 1893 BRIDGE_LOCK(sc); 1894 1895 /* 1896 * If bridge is down, but the original output interface is up, 1897 * go ahead and send out that interface. Otherwise, the packet 1898 * is dropped below. 1899 */ 1900 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1901 dst_if = ifp; 1902 goto sendunicast; 1903 } 1904 1905 /* 1906 * If the packet is a multicast, or we don't know a better way to 1907 * get there, send to all interfaces. 1908 */ 1909 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1910 dst_if = NULL; 1911 else 1912 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1913 if (dst_if == NULL) { 1914 struct bridge_iflist *bif; 1915 struct mbuf *mc; 1916 int error = 0, used = 0; 1917 1918 bridge_span(sc, m); 1919 1920 BRIDGE_LOCK2REF(sc, error); 1921 if (error) { 1922 m_freem(m); 1923 return (0); 1924 } 1925 1926 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1927 dst_if = bif->bif_ifp; 1928 1929 if (dst_if->if_type == IFT_GIF) 1930 continue; 1931 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1932 continue; 1933 1934 /* 1935 * If this is not the original output interface, 1936 * and the interface is participating in spanning 1937 * tree, make sure the port is in a state that 1938 * allows forwarding. 1939 */ 1940 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1941 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1942 continue; 1943 1944 if (LIST_NEXT(bif, bif_next) == NULL) { 1945 used = 1; 1946 mc = m; 1947 } else { 1948 mc = m_copypacket(m, M_DONTWAIT); 1949 if (mc == NULL) { 1950 sc->sc_ifp->if_oerrors++; 1951 continue; 1952 } 1953 } 1954 1955 bridge_enqueue(sc, dst_if, mc); 1956 } 1957 if (used == 0) 1958 m_freem(m); 1959 BRIDGE_UNREF(sc); 1960 return (0); 1961 } 1962 1963 sendunicast: 1964 /* 1965 * XXX Spanning tree consideration here? 1966 */ 1967 1968 bridge_span(sc, m); 1969 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1970 m_freem(m); 1971 BRIDGE_UNLOCK(sc); 1972 return (0); 1973 } 1974 1975 BRIDGE_UNLOCK(sc); 1976 bridge_enqueue(sc, dst_if, m); 1977 return (0); 1978 } 1979 1980 /* 1981 * bridge_start: 1982 * 1983 * Start output on a bridge. 1984 * 1985 */ 1986 static void 1987 bridge_start(struct ifnet *ifp) 1988 { 1989 struct bridge_softc *sc; 1990 struct mbuf *m; 1991 struct ether_header *eh; 1992 struct ifnet *dst_if; 1993 1994 sc = ifp->if_softc; 1995 1996 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1997 for (;;) { 1998 IFQ_DEQUEUE(&ifp->if_snd, m); 1999 if (m == 0) 2000 break; 2001 ETHER_BPF_MTAP(ifp, m); 2002 2003 eh = mtod(m, struct ether_header *); 2004 dst_if = NULL; 2005 2006 BRIDGE_LOCK(sc); 2007 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2008 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 2009 } 2010 2011 if (dst_if == NULL) 2012 bridge_broadcast(sc, ifp, m, 0); 2013 else { 2014 BRIDGE_UNLOCK(sc); 2015 bridge_enqueue(sc, dst_if, m); 2016 } 2017 } 2018 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 2019 } 2020 2021 /* 2022 * bridge_forward: 2023 * 2024 * The forwarding function of the bridge. 2025 * 2026 * NOTE: Releases the lock on return. 2027 */ 2028 static void 2029 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2030 struct mbuf *m) 2031 { 2032 struct bridge_iflist *dbif; 2033 struct ifnet *src_if, *dst_if, *ifp; 2034 struct ether_header *eh; 2035 uint16_t vlan; 2036 uint8_t *dst; 2037 int error; 2038 2039 src_if = m->m_pkthdr.rcvif; 2040 ifp = sc->sc_ifp; 2041 2042 ifp->if_ipackets++; 2043 ifp->if_ibytes += m->m_pkthdr.len; 2044 vlan = VLANTAGOF(m); 2045 2046 if ((sbif->bif_flags & IFBIF_STP) && 2047 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2048 goto drop; 2049 2050 eh = mtod(m, struct ether_header *); 2051 dst = eh->ether_dhost; 2052 2053 /* If the interface is learning, record the address. */ 2054 if (sbif->bif_flags & IFBIF_LEARNING) { 2055 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2056 sbif, 0, IFBAF_DYNAMIC); 2057 /* 2058 * If the interface has addresses limits then deny any source 2059 * that is not in the cache. 2060 */ 2061 if (error && sbif->bif_addrmax) 2062 goto drop; 2063 } 2064 2065 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2066 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2067 goto drop; 2068 2069 /* 2070 * At this point, the port either doesn't participate 2071 * in spanning tree or it is in the forwarding state. 2072 */ 2073 2074 /* 2075 * If the packet is unicast, destined for someone on 2076 * "this" side of the bridge, drop it. 2077 */ 2078 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2079 dst_if = bridge_rtlookup(sc, dst, vlan); 2080 if (src_if == dst_if) 2081 goto drop; 2082 } else { 2083 /* 2084 * Check if its a reserved multicast address, any address 2085 * listed in 802.1D section 7.12.6 may not be forwarded by the 2086 * bridge. 2087 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2088 */ 2089 if (dst[0] == 0x01 && dst[1] == 0x80 && 2090 dst[2] == 0xc2 && dst[3] == 0x00 && 2091 dst[4] == 0x00 && dst[5] <= 0x0f) 2092 goto drop; 2093 2094 /* ...forward it to all interfaces. */ 2095 ifp->if_imcasts++; 2096 dst_if = NULL; 2097 } 2098 2099 /* 2100 * If we have a destination interface which is a member of our bridge, 2101 * OR this is a unicast packet, push it through the bpf(4) machinery. 2102 * For broadcast or multicast packets, don't bother because it will 2103 * be reinjected into ether_input. We do this before we pass the packets 2104 * through the pfil(9) framework, as it is possible that pfil(9) will 2105 * drop the packet, or possibly modify it, making it difficult to debug 2106 * firewall issues on the bridge. 2107 */ 2108 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2109 ETHER_BPF_MTAP(ifp, m); 2110 2111 /* run the packet filter */ 2112 if (PFIL_HOOKED(&V_inet_pfil_hook) 2113 #ifdef INET6 2114 || PFIL_HOOKED(&V_inet6_pfil_hook) 2115 #endif 2116 ) { 2117 BRIDGE_UNLOCK(sc); 2118 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2119 return; 2120 if (m == NULL) 2121 return; 2122 BRIDGE_LOCK(sc); 2123 } 2124 2125 if (dst_if == NULL) { 2126 bridge_broadcast(sc, src_if, m, 1); 2127 return; 2128 } 2129 2130 /* 2131 * At this point, we're dealing with a unicast frame 2132 * going to a different interface. 2133 */ 2134 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2135 goto drop; 2136 2137 dbif = bridge_lookup_member_if(sc, dst_if); 2138 if (dbif == NULL) 2139 /* Not a member of the bridge (anymore?) */ 2140 goto drop; 2141 2142 /* Private segments can not talk to each other */ 2143 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2144 goto drop; 2145 2146 if ((dbif->bif_flags & IFBIF_STP) && 2147 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2148 goto drop; 2149 2150 BRIDGE_UNLOCK(sc); 2151 2152 if (PFIL_HOOKED(&V_inet_pfil_hook) 2153 #ifdef INET6 2154 || PFIL_HOOKED(&V_inet6_pfil_hook) 2155 #endif 2156 ) { 2157 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2158 return; 2159 if (m == NULL) 2160 return; 2161 } 2162 2163 bridge_enqueue(sc, dst_if, m); 2164 return; 2165 2166 drop: 2167 BRIDGE_UNLOCK(sc); 2168 m_freem(m); 2169 } 2170 2171 /* 2172 * bridge_input: 2173 * 2174 * Receive input from a member interface. Queue the packet for 2175 * bridging if it is not for us. 2176 */ 2177 static struct mbuf * 2178 bridge_input(struct ifnet *ifp, struct mbuf *m) 2179 { 2180 struct bridge_softc *sc = ifp->if_bridge; 2181 struct bridge_iflist *bif, *bif2; 2182 struct ifnet *bifp; 2183 struct ether_header *eh; 2184 struct mbuf *mc, *mc2; 2185 uint16_t vlan; 2186 int error; 2187 2188 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2189 return (m); 2190 2191 bifp = sc->sc_ifp; 2192 vlan = VLANTAGOF(m); 2193 2194 /* 2195 * Implement support for bridge monitoring. If this flag has been 2196 * set on this interface, discard the packet once we push it through 2197 * the bpf(4) machinery, but before we do, increment the byte and 2198 * packet counters associated with this interface. 2199 */ 2200 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2201 m->m_pkthdr.rcvif = bifp; 2202 ETHER_BPF_MTAP(bifp, m); 2203 bifp->if_ipackets++; 2204 bifp->if_ibytes += m->m_pkthdr.len; 2205 m_freem(m); 2206 return (NULL); 2207 } 2208 BRIDGE_LOCK(sc); 2209 bif = bridge_lookup_member_if(sc, ifp); 2210 if (bif == NULL) { 2211 BRIDGE_UNLOCK(sc); 2212 return (m); 2213 } 2214 2215 eh = mtod(m, struct ether_header *); 2216 2217 bridge_span(sc, m); 2218 2219 if (m->m_flags & (M_BCAST|M_MCAST)) { 2220 /* Tap off 802.1D packets; they do not get forwarded. */ 2221 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2222 ETHER_ADDR_LEN) == 0) { 2223 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2224 BRIDGE_UNLOCK(sc); 2225 return (NULL); 2226 } 2227 2228 if ((bif->bif_flags & IFBIF_STP) && 2229 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2230 BRIDGE_UNLOCK(sc); 2231 return (m); 2232 } 2233 2234 /* 2235 * Make a deep copy of the packet and enqueue the copy 2236 * for bridge processing; return the original packet for 2237 * local processing. 2238 */ 2239 mc = m_dup(m, M_DONTWAIT); 2240 if (mc == NULL) { 2241 BRIDGE_UNLOCK(sc); 2242 return (m); 2243 } 2244 2245 /* Perform the bridge forwarding function with the copy. */ 2246 bridge_forward(sc, bif, mc); 2247 2248 /* 2249 * Reinject the mbuf as arriving on the bridge so we have a 2250 * chance at claiming multicast packets. We can not loop back 2251 * here from ether_input as a bridge is never a member of a 2252 * bridge. 2253 */ 2254 KASSERT(bifp->if_bridge == NULL, 2255 ("loop created in bridge_input")); 2256 mc2 = m_dup(m, M_DONTWAIT); 2257 if (mc2 != NULL) { 2258 /* Keep the layer3 header aligned */ 2259 int i = min(mc2->m_pkthdr.len, max_protohdr); 2260 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2261 } 2262 if (mc2 != NULL) { 2263 mc2->m_pkthdr.rcvif = bifp; 2264 (*bifp->if_input)(bifp, mc2); 2265 } 2266 2267 /* Return the original packet for local processing. */ 2268 return (m); 2269 } 2270 2271 if ((bif->bif_flags & IFBIF_STP) && 2272 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2273 BRIDGE_UNLOCK(sc); 2274 return (m); 2275 } 2276 2277 #if (defined(INET) || defined(INET6)) 2278 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2279 || ((iface)->if_carp \ 2280 && (*carp_forus_p)((iface), eh->ether_dhost)) 2281 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2282 || ((iface)->if_carp \ 2283 && (*carp_forus_p)((iface), eh->ether_shost)) 2284 #else 2285 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2286 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2287 #endif 2288 2289 #ifdef INET6 2290 # define OR_PFIL_HOOKED_INET6 \ 2291 || PFIL_HOOKED(&V_inet6_pfil_hook) 2292 #else 2293 # define OR_PFIL_HOOKED_INET6 2294 #endif 2295 2296 #define GRAB_OUR_PACKETS(iface) \ 2297 if ((iface)->if_type == IFT_GIF) \ 2298 continue; \ 2299 /* It is destined for us. */ \ 2300 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2301 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2302 ) { \ 2303 if ((iface)->if_type == IFT_BRIDGE) { \ 2304 ETHER_BPF_MTAP(iface, m); \ 2305 iface->if_ipackets++; \ 2306 /* Filter on the physical interface. */ \ 2307 if (pfil_local_phys && \ 2308 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2309 OR_PFIL_HOOKED_INET6)) { \ 2310 if (bridge_pfil(&m, NULL, ifp, \ 2311 PFIL_IN) != 0 || m == NULL) { \ 2312 BRIDGE_UNLOCK(sc); \ 2313 return (NULL); \ 2314 } \ 2315 } \ 2316 } \ 2317 if (bif->bif_flags & IFBIF_LEARNING) { \ 2318 error = bridge_rtupdate(sc, eh->ether_shost, \ 2319 vlan, bif, 0, IFBAF_DYNAMIC); \ 2320 if (error && bif->bif_addrmax) { \ 2321 BRIDGE_UNLOCK(sc); \ 2322 m_freem(m); \ 2323 return (NULL); \ 2324 } \ 2325 } \ 2326 m->m_pkthdr.rcvif = iface; \ 2327 BRIDGE_UNLOCK(sc); \ 2328 return (m); \ 2329 } \ 2330 \ 2331 /* We just received a packet that we sent out. */ \ 2332 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2333 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2334 ) { \ 2335 BRIDGE_UNLOCK(sc); \ 2336 m_freem(m); \ 2337 return (NULL); \ 2338 } 2339 2340 /* 2341 * Unicast. Make sure it's not for the bridge. 2342 */ 2343 do { GRAB_OUR_PACKETS(bifp) } while (0); 2344 2345 /* 2346 * Give a chance for ifp at first priority. This will help when the 2347 * packet comes through the interface like VLAN's with the same MACs 2348 * on several interfaces from the same bridge. This also will save 2349 * some CPU cycles in case the destination interface and the input 2350 * interface (eq ifp) are the same. 2351 */ 2352 do { GRAB_OUR_PACKETS(ifp) } while (0); 2353 2354 /* Now check the all bridge members. */ 2355 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2356 GRAB_OUR_PACKETS(bif2->bif_ifp) 2357 } 2358 2359 #undef OR_CARP_CHECK_WE_ARE_DST 2360 #undef OR_CARP_CHECK_WE_ARE_SRC 2361 #undef OR_PFIL_HOOKED_INET6 2362 #undef GRAB_OUR_PACKETS 2363 2364 /* Perform the bridge forwarding function. */ 2365 bridge_forward(sc, bif, m); 2366 2367 return (NULL); 2368 } 2369 2370 /* 2371 * bridge_broadcast: 2372 * 2373 * Send a frame to all interfaces that are members of 2374 * the bridge, except for the one on which the packet 2375 * arrived. 2376 * 2377 * NOTE: Releases the lock on return. 2378 */ 2379 static void 2380 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2381 struct mbuf *m, int runfilt) 2382 { 2383 struct bridge_iflist *dbif, *sbif; 2384 struct mbuf *mc; 2385 struct ifnet *dst_if; 2386 int error = 0, used = 0, i; 2387 2388 sbif = bridge_lookup_member_if(sc, src_if); 2389 2390 BRIDGE_LOCK2REF(sc, error); 2391 if (error) { 2392 m_freem(m); 2393 return; 2394 } 2395 2396 /* Filter on the bridge interface before broadcasting */ 2397 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2398 #ifdef INET6 2399 || PFIL_HOOKED(&V_inet6_pfil_hook) 2400 #endif 2401 )) { 2402 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2403 goto out; 2404 if (m == NULL) 2405 goto out; 2406 } 2407 2408 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2409 dst_if = dbif->bif_ifp; 2410 if (dst_if == src_if) 2411 continue; 2412 2413 /* Private segments can not talk to each other */ 2414 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2415 continue; 2416 2417 if ((dbif->bif_flags & IFBIF_STP) && 2418 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2419 continue; 2420 2421 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2422 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2423 continue; 2424 2425 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2426 continue; 2427 2428 if (LIST_NEXT(dbif, bif_next) == NULL) { 2429 mc = m; 2430 used = 1; 2431 } else { 2432 mc = m_dup(m, M_DONTWAIT); 2433 if (mc == NULL) { 2434 sc->sc_ifp->if_oerrors++; 2435 continue; 2436 } 2437 } 2438 2439 /* 2440 * Filter on the output interface. Pass a NULL bridge interface 2441 * pointer so we do not redundantly filter on the bridge for 2442 * each interface we broadcast on. 2443 */ 2444 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2445 #ifdef INET6 2446 || PFIL_HOOKED(&V_inet6_pfil_hook) 2447 #endif 2448 )) { 2449 if (used == 0) { 2450 /* Keep the layer3 header aligned */ 2451 i = min(mc->m_pkthdr.len, max_protohdr); 2452 mc = m_copyup(mc, i, ETHER_ALIGN); 2453 if (mc == NULL) { 2454 sc->sc_ifp->if_oerrors++; 2455 continue; 2456 } 2457 } 2458 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2459 continue; 2460 if (mc == NULL) 2461 continue; 2462 } 2463 2464 bridge_enqueue(sc, dst_if, mc); 2465 } 2466 if (used == 0) 2467 m_freem(m); 2468 2469 out: 2470 BRIDGE_UNREF(sc); 2471 } 2472 2473 /* 2474 * bridge_span: 2475 * 2476 * Duplicate a packet out one or more interfaces that are in span mode, 2477 * the original mbuf is unmodified. 2478 */ 2479 static void 2480 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2481 { 2482 struct bridge_iflist *bif; 2483 struct ifnet *dst_if; 2484 struct mbuf *mc; 2485 2486 if (LIST_EMPTY(&sc->sc_spanlist)) 2487 return; 2488 2489 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2490 dst_if = bif->bif_ifp; 2491 2492 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2493 continue; 2494 2495 mc = m_copypacket(m, M_DONTWAIT); 2496 if (mc == NULL) { 2497 sc->sc_ifp->if_oerrors++; 2498 continue; 2499 } 2500 2501 bridge_enqueue(sc, dst_if, mc); 2502 } 2503 } 2504 2505 /* 2506 * bridge_rtupdate: 2507 * 2508 * Add a bridge routing entry. 2509 */ 2510 static int 2511 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2512 struct bridge_iflist *bif, int setflags, uint8_t flags) 2513 { 2514 struct bridge_rtnode *brt; 2515 int error; 2516 2517 BRIDGE_LOCK_ASSERT(sc); 2518 2519 /* Check the source address is valid and not multicast. */ 2520 if (ETHER_IS_MULTICAST(dst) || 2521 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2522 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2523 return (EINVAL); 2524 2525 /* 802.1p frames map to vlan 1 */ 2526 if (vlan == 0) 2527 vlan = 1; 2528 2529 /* 2530 * A route for this destination might already exist. If so, 2531 * update it, otherwise create a new one. 2532 */ 2533 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2534 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2535 sc->sc_brtexceeded++; 2536 return (ENOSPC); 2537 } 2538 /* Check per interface address limits (if enabled) */ 2539 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2540 bif->bif_addrexceeded++; 2541 return (ENOSPC); 2542 } 2543 2544 /* 2545 * Allocate a new bridge forwarding node, and 2546 * initialize the expiration time and Ethernet 2547 * address. 2548 */ 2549 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2550 if (brt == NULL) 2551 return (ENOMEM); 2552 2553 if (bif->bif_flags & IFBIF_STICKY) 2554 brt->brt_flags = IFBAF_STICKY; 2555 else 2556 brt->brt_flags = IFBAF_DYNAMIC; 2557 2558 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2559 brt->brt_vlan = vlan; 2560 2561 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2562 uma_zfree(bridge_rtnode_zone, brt); 2563 return (error); 2564 } 2565 brt->brt_dst = bif; 2566 bif->bif_addrcnt++; 2567 } 2568 2569 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2570 brt->brt_dst != bif) { 2571 brt->brt_dst->bif_addrcnt--; 2572 brt->brt_dst = bif; 2573 brt->brt_dst->bif_addrcnt++; 2574 } 2575 2576 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2577 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2578 if (setflags) 2579 brt->brt_flags = flags; 2580 2581 return (0); 2582 } 2583 2584 /* 2585 * bridge_rtlookup: 2586 * 2587 * Lookup the destination interface for an address. 2588 */ 2589 static struct ifnet * 2590 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2591 { 2592 struct bridge_rtnode *brt; 2593 2594 BRIDGE_LOCK_ASSERT(sc); 2595 2596 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2597 return (NULL); 2598 2599 return (brt->brt_ifp); 2600 } 2601 2602 /* 2603 * bridge_rttrim: 2604 * 2605 * Trim the routine table so that we have a number 2606 * of routing entries less than or equal to the 2607 * maximum number. 2608 */ 2609 static void 2610 bridge_rttrim(struct bridge_softc *sc) 2611 { 2612 struct bridge_rtnode *brt, *nbrt; 2613 2614 BRIDGE_LOCK_ASSERT(sc); 2615 2616 /* Make sure we actually need to do this. */ 2617 if (sc->sc_brtcnt <= sc->sc_brtmax) 2618 return; 2619 2620 /* Force an aging cycle; this might trim enough addresses. */ 2621 bridge_rtage(sc); 2622 if (sc->sc_brtcnt <= sc->sc_brtmax) 2623 return; 2624 2625 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2626 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2627 bridge_rtnode_destroy(sc, brt); 2628 if (sc->sc_brtcnt <= sc->sc_brtmax) 2629 return; 2630 } 2631 } 2632 } 2633 2634 /* 2635 * bridge_timer: 2636 * 2637 * Aging timer for the bridge. 2638 */ 2639 static void 2640 bridge_timer(void *arg) 2641 { 2642 struct bridge_softc *sc = arg; 2643 2644 BRIDGE_LOCK_ASSERT(sc); 2645 2646 bridge_rtage(sc); 2647 2648 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2649 callout_reset(&sc->sc_brcallout, 2650 bridge_rtable_prune_period * hz, bridge_timer, sc); 2651 } 2652 2653 /* 2654 * bridge_rtage: 2655 * 2656 * Perform an aging cycle. 2657 */ 2658 static void 2659 bridge_rtage(struct bridge_softc *sc) 2660 { 2661 struct bridge_rtnode *brt, *nbrt; 2662 2663 BRIDGE_LOCK_ASSERT(sc); 2664 2665 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2666 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2667 if (time_uptime >= brt->brt_expire) 2668 bridge_rtnode_destroy(sc, brt); 2669 } 2670 } 2671 } 2672 2673 /* 2674 * bridge_rtflush: 2675 * 2676 * Remove all dynamic addresses from the bridge. 2677 */ 2678 static void 2679 bridge_rtflush(struct bridge_softc *sc, int full) 2680 { 2681 struct bridge_rtnode *brt, *nbrt; 2682 2683 BRIDGE_LOCK_ASSERT(sc); 2684 2685 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2686 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2687 bridge_rtnode_destroy(sc, brt); 2688 } 2689 } 2690 2691 /* 2692 * bridge_rtdaddr: 2693 * 2694 * Remove an address from the table. 2695 */ 2696 static int 2697 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2698 { 2699 struct bridge_rtnode *brt; 2700 int found = 0; 2701 2702 BRIDGE_LOCK_ASSERT(sc); 2703 2704 /* 2705 * If vlan is zero then we want to delete for all vlans so the lookup 2706 * may return more than one. 2707 */ 2708 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2709 bridge_rtnode_destroy(sc, brt); 2710 found = 1; 2711 } 2712 2713 return (found ? 0 : ENOENT); 2714 } 2715 2716 /* 2717 * bridge_rtdelete: 2718 * 2719 * Delete routes to a speicifc member interface. 2720 */ 2721 static void 2722 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2723 { 2724 struct bridge_rtnode *brt, *nbrt; 2725 2726 BRIDGE_LOCK_ASSERT(sc); 2727 2728 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2729 if (brt->brt_ifp == ifp && (full || 2730 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2731 bridge_rtnode_destroy(sc, brt); 2732 } 2733 } 2734 2735 /* 2736 * bridge_rtable_init: 2737 * 2738 * Initialize the route table for this bridge. 2739 */ 2740 static int 2741 bridge_rtable_init(struct bridge_softc *sc) 2742 { 2743 int i; 2744 2745 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2746 M_DEVBUF, M_NOWAIT); 2747 if (sc->sc_rthash == NULL) 2748 return (ENOMEM); 2749 2750 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2751 LIST_INIT(&sc->sc_rthash[i]); 2752 2753 sc->sc_rthash_key = arc4random(); 2754 2755 LIST_INIT(&sc->sc_rtlist); 2756 2757 return (0); 2758 } 2759 2760 /* 2761 * bridge_rtable_fini: 2762 * 2763 * Deconstruct the route table for this bridge. 2764 */ 2765 static void 2766 bridge_rtable_fini(struct bridge_softc *sc) 2767 { 2768 2769 KASSERT(sc->sc_brtcnt == 0, 2770 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2771 free(sc->sc_rthash, M_DEVBUF); 2772 } 2773 2774 /* 2775 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2776 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2777 */ 2778 #define mix(a, b, c) \ 2779 do { \ 2780 a -= b; a -= c; a ^= (c >> 13); \ 2781 b -= c; b -= a; b ^= (a << 8); \ 2782 c -= a; c -= b; c ^= (b >> 13); \ 2783 a -= b; a -= c; a ^= (c >> 12); \ 2784 b -= c; b -= a; b ^= (a << 16); \ 2785 c -= a; c -= b; c ^= (b >> 5); \ 2786 a -= b; a -= c; a ^= (c >> 3); \ 2787 b -= c; b -= a; b ^= (a << 10); \ 2788 c -= a; c -= b; c ^= (b >> 15); \ 2789 } while (/*CONSTCOND*/0) 2790 2791 static __inline uint32_t 2792 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2793 { 2794 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2795 2796 b += addr[5] << 8; 2797 b += addr[4]; 2798 a += addr[3] << 24; 2799 a += addr[2] << 16; 2800 a += addr[1] << 8; 2801 a += addr[0]; 2802 2803 mix(a, b, c); 2804 2805 return (c & BRIDGE_RTHASH_MASK); 2806 } 2807 2808 #undef mix 2809 2810 static int 2811 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2812 { 2813 int i, d; 2814 2815 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2816 d = ((int)a[i]) - ((int)b[i]); 2817 } 2818 2819 return (d); 2820 } 2821 2822 /* 2823 * bridge_rtnode_lookup: 2824 * 2825 * Look up a bridge route node for the specified destination. Compare the 2826 * vlan id or if zero then just return the first match. 2827 */ 2828 static struct bridge_rtnode * 2829 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2830 { 2831 struct bridge_rtnode *brt; 2832 uint32_t hash; 2833 int dir; 2834 2835 BRIDGE_LOCK_ASSERT(sc); 2836 2837 hash = bridge_rthash(sc, addr); 2838 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2839 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2840 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2841 return (brt); 2842 if (dir > 0) 2843 return (NULL); 2844 } 2845 2846 return (NULL); 2847 } 2848 2849 /* 2850 * bridge_rtnode_insert: 2851 * 2852 * Insert the specified bridge node into the route table. We 2853 * assume the entry is not already in the table. 2854 */ 2855 static int 2856 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2857 { 2858 struct bridge_rtnode *lbrt; 2859 uint32_t hash; 2860 int dir; 2861 2862 BRIDGE_LOCK_ASSERT(sc); 2863 2864 hash = bridge_rthash(sc, brt->brt_addr); 2865 2866 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2867 if (lbrt == NULL) { 2868 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2869 goto out; 2870 } 2871 2872 do { 2873 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2874 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2875 return (EEXIST); 2876 if (dir > 0) { 2877 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2878 goto out; 2879 } 2880 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2881 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2882 goto out; 2883 } 2884 lbrt = LIST_NEXT(lbrt, brt_hash); 2885 } while (lbrt != NULL); 2886 2887 #ifdef DIAGNOSTIC 2888 panic("bridge_rtnode_insert: impossible"); 2889 #endif 2890 2891 out: 2892 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2893 sc->sc_brtcnt++; 2894 2895 return (0); 2896 } 2897 2898 /* 2899 * bridge_rtnode_destroy: 2900 * 2901 * Destroy a bridge rtnode. 2902 */ 2903 static void 2904 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2905 { 2906 BRIDGE_LOCK_ASSERT(sc); 2907 2908 LIST_REMOVE(brt, brt_hash); 2909 2910 LIST_REMOVE(brt, brt_list); 2911 sc->sc_brtcnt--; 2912 brt->brt_dst->bif_addrcnt--; 2913 uma_zfree(bridge_rtnode_zone, brt); 2914 } 2915 2916 /* 2917 * bridge_rtable_expire: 2918 * 2919 * Set the expiry time for all routes on an interface. 2920 */ 2921 static void 2922 bridge_rtable_expire(struct ifnet *ifp, int age) 2923 { 2924 struct bridge_softc *sc = ifp->if_bridge; 2925 struct bridge_rtnode *brt; 2926 2927 BRIDGE_LOCK(sc); 2928 2929 /* 2930 * If the age is zero then flush, otherwise set all the expiry times to 2931 * age for the interface 2932 */ 2933 if (age == 0) 2934 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2935 else { 2936 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2937 /* Cap the expiry time to 'age' */ 2938 if (brt->brt_ifp == ifp && 2939 brt->brt_expire > time_uptime + age && 2940 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2941 brt->brt_expire = time_uptime + age; 2942 } 2943 } 2944 BRIDGE_UNLOCK(sc); 2945 } 2946 2947 /* 2948 * bridge_state_change: 2949 * 2950 * Callback from the bridgestp code when a port changes states. 2951 */ 2952 static void 2953 bridge_state_change(struct ifnet *ifp, int state) 2954 { 2955 struct bridge_softc *sc = ifp->if_bridge; 2956 static const char *stpstates[] = { 2957 "disabled", 2958 "listening", 2959 "learning", 2960 "forwarding", 2961 "blocking", 2962 "discarding" 2963 }; 2964 2965 if (log_stp) 2966 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2967 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2968 } 2969 2970 /* 2971 * Send bridge packets through pfil if they are one of the types pfil can deal 2972 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2973 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2974 * that interface. 2975 */ 2976 static int 2977 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2978 { 2979 int snap, error, i, hlen; 2980 struct ether_header *eh1, eh2; 2981 struct ip_fw_args args; 2982 struct ip *ip; 2983 struct llc llc1; 2984 u_int16_t ether_type; 2985 2986 snap = 0; 2987 error = -1; /* Default error if not error == 0 */ 2988 2989 #if 0 2990 /* we may return with the IP fields swapped, ensure its not shared */ 2991 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2992 #endif 2993 2994 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2995 return (0); /* filtering is disabled */ 2996 2997 i = min((*mp)->m_pkthdr.len, max_protohdr); 2998 if ((*mp)->m_len < i) { 2999 *mp = m_pullup(*mp, i); 3000 if (*mp == NULL) { 3001 printf("%s: m_pullup failed\n", __func__); 3002 return (-1); 3003 } 3004 } 3005 3006 eh1 = mtod(*mp, struct ether_header *); 3007 ether_type = ntohs(eh1->ether_type); 3008 3009 /* 3010 * Check for SNAP/LLC. 3011 */ 3012 if (ether_type < ETHERMTU) { 3013 struct llc *llc2 = (struct llc *)(eh1 + 1); 3014 3015 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3016 llc2->llc_dsap == LLC_SNAP_LSAP && 3017 llc2->llc_ssap == LLC_SNAP_LSAP && 3018 llc2->llc_control == LLC_UI) { 3019 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3020 snap = 1; 3021 } 3022 } 3023 3024 /* 3025 * If we're trying to filter bridge traffic, don't look at anything 3026 * other than IP and ARP traffic. If the filter doesn't understand 3027 * IPv6, don't allow IPv6 through the bridge either. This is lame 3028 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3029 * but of course we don't have an AppleTalk filter to begin with. 3030 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3031 * ARP traffic.) 3032 */ 3033 switch (ether_type) { 3034 case ETHERTYPE_ARP: 3035 case ETHERTYPE_REVARP: 3036 if (pfil_ipfw_arp == 0) 3037 return (0); /* Automatically pass */ 3038 break; 3039 3040 case ETHERTYPE_IP: 3041 #ifdef INET6 3042 case ETHERTYPE_IPV6: 3043 #endif /* INET6 */ 3044 break; 3045 default: 3046 /* 3047 * Check to see if the user wants to pass non-ip 3048 * packets, these will not be checked by pfil(9) and 3049 * passed unconditionally so the default is to drop. 3050 */ 3051 if (pfil_onlyip) 3052 goto bad; 3053 } 3054 3055 /* Strip off the Ethernet header and keep a copy. */ 3056 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3057 m_adj(*mp, ETHER_HDR_LEN); 3058 3059 /* Strip off snap header, if present */ 3060 if (snap) { 3061 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3062 m_adj(*mp, sizeof(struct llc)); 3063 } 3064 3065 /* 3066 * Check the IP header for alignment and errors 3067 */ 3068 if (dir == PFIL_IN) { 3069 switch (ether_type) { 3070 case ETHERTYPE_IP: 3071 error = bridge_ip_checkbasic(mp); 3072 break; 3073 #ifdef INET6 3074 case ETHERTYPE_IPV6: 3075 error = bridge_ip6_checkbasic(mp); 3076 break; 3077 #endif /* INET6 */ 3078 default: 3079 error = 0; 3080 } 3081 if (error) 3082 goto bad; 3083 } 3084 3085 /* XXX this section is also in if_ethersubr.c */ 3086 // XXX PFIL_OUT or DIR_OUT ? 3087 if (V_ip_fw_chk_ptr && pfil_ipfw != 0 && 3088 dir == PFIL_OUT && ifp != NULL) { 3089 struct m_tag *mtag; 3090 3091 error = -1; 3092 /* fetch the start point from existing tags, if any */ 3093 mtag = m_tag_locate(*mp, MTAG_IPFW_RULE, 0, NULL); 3094 if (mtag == NULL) { 3095 args.rule.slot = 0; 3096 } else { 3097 struct ipfw_rule_ref *r; 3098 3099 /* XXX can we free the tag after use ? */ 3100 mtag->m_tag_id = PACKET_TAG_NONE; 3101 r = (struct ipfw_rule_ref *)(mtag + 1); 3102 /* packet already partially processed ? */ 3103 if (r->info & IPFW_ONEPASS) 3104 goto ipfwpass; 3105 args.rule = *r; 3106 } 3107 3108 args.m = *mp; 3109 args.oif = ifp; 3110 args.next_hop = NULL; 3111 args.next_hop6 = NULL; 3112 args.eh = &eh2; 3113 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3114 i = V_ip_fw_chk_ptr(&args); 3115 *mp = args.m; 3116 3117 if (*mp == NULL) 3118 return (error); 3119 3120 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) { 3121 3122 /* put the Ethernet header back on */ 3123 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3124 if (*mp == NULL) 3125 return (error); 3126 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3127 3128 /* 3129 * Pass the pkt to dummynet, which consumes it. The 3130 * packet will return to us via bridge_dummynet(). 3131 */ 3132 args.oif = ifp; 3133 ip_dn_io_ptr(mp, DIR_FWD | PROTO_IFB, &args); 3134 return (error); 3135 } 3136 3137 if (i != IP_FW_PASS) /* drop */ 3138 goto bad; 3139 } 3140 3141 ipfwpass: 3142 error = 0; 3143 3144 /* 3145 * Run the packet through pfil 3146 */ 3147 switch (ether_type) { 3148 case ETHERTYPE_IP: 3149 /* 3150 * before calling the firewall, swap fields the same as 3151 * IP does. here we assume the header is contiguous 3152 */ 3153 ip = mtod(*mp, struct ip *); 3154 3155 ip->ip_len = ntohs(ip->ip_len); 3156 ip->ip_off = ntohs(ip->ip_off); 3157 3158 /* 3159 * Run pfil on the member interface and the bridge, both can 3160 * be skipped by clearing pfil_member or pfil_bridge. 3161 * 3162 * Keep the order: 3163 * in_if -> bridge_if -> out_if 3164 */ 3165 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3166 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3167 dir, NULL); 3168 3169 if (*mp == NULL || error != 0) /* filter may consume */ 3170 break; 3171 3172 if (pfil_member && ifp != NULL) 3173 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3174 dir, NULL); 3175 3176 if (*mp == NULL || error != 0) /* filter may consume */ 3177 break; 3178 3179 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3180 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3181 dir, NULL); 3182 3183 if (*mp == NULL || error != 0) /* filter may consume */ 3184 break; 3185 3186 /* check if we need to fragment the packet */ 3187 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3188 i = (*mp)->m_pkthdr.len; 3189 if (i > ifp->if_mtu) { 3190 error = bridge_fragment(ifp, *mp, &eh2, snap, 3191 &llc1); 3192 return (error); 3193 } 3194 } 3195 3196 /* Recalculate the ip checksum and restore byte ordering */ 3197 ip = mtod(*mp, struct ip *); 3198 hlen = ip->ip_hl << 2; 3199 if (hlen < sizeof(struct ip)) 3200 goto bad; 3201 if (hlen > (*mp)->m_len) { 3202 if ((*mp = m_pullup(*mp, hlen)) == 0) 3203 goto bad; 3204 ip = mtod(*mp, struct ip *); 3205 if (ip == NULL) 3206 goto bad; 3207 } 3208 ip->ip_len = htons(ip->ip_len); 3209 ip->ip_off = htons(ip->ip_off); 3210 ip->ip_sum = 0; 3211 if (hlen == sizeof(struct ip)) 3212 ip->ip_sum = in_cksum_hdr(ip); 3213 else 3214 ip->ip_sum = in_cksum(*mp, hlen); 3215 3216 break; 3217 #ifdef INET6 3218 case ETHERTYPE_IPV6: 3219 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3220 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3221 dir, NULL); 3222 3223 if (*mp == NULL || error != 0) /* filter may consume */ 3224 break; 3225 3226 if (pfil_member && ifp != NULL) 3227 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3228 dir, NULL); 3229 3230 if (*mp == NULL || error != 0) /* filter may consume */ 3231 break; 3232 3233 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3234 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3235 dir, NULL); 3236 break; 3237 #endif 3238 default: 3239 error = 0; 3240 break; 3241 } 3242 3243 if (*mp == NULL) 3244 return (error); 3245 if (error != 0) 3246 goto bad; 3247 3248 error = -1; 3249 3250 /* 3251 * Finally, put everything back the way it was and return 3252 */ 3253 if (snap) { 3254 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3255 if (*mp == NULL) 3256 return (error); 3257 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3258 } 3259 3260 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3261 if (*mp == NULL) 3262 return (error); 3263 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3264 3265 return (0); 3266 3267 bad: 3268 m_freem(*mp); 3269 *mp = NULL; 3270 return (error); 3271 } 3272 3273 /* 3274 * Perform basic checks on header size since 3275 * pfil assumes ip_input has already processed 3276 * it for it. Cut-and-pasted from ip_input.c. 3277 * Given how simple the IPv6 version is, 3278 * does the IPv4 version really need to be 3279 * this complicated? 3280 * 3281 * XXX Should we update ipstat here, or not? 3282 * XXX Right now we update ipstat but not 3283 * XXX csum_counter. 3284 */ 3285 static int 3286 bridge_ip_checkbasic(struct mbuf **mp) 3287 { 3288 struct mbuf *m = *mp; 3289 struct ip *ip; 3290 int len, hlen; 3291 u_short sum; 3292 3293 if (*mp == NULL) 3294 return (-1); 3295 3296 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3297 if ((m = m_copyup(m, sizeof(struct ip), 3298 (max_linkhdr + 3) & ~3)) == NULL) { 3299 /* XXXJRT new stat, please */ 3300 KMOD_IPSTAT_INC(ips_toosmall); 3301 goto bad; 3302 } 3303 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3304 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3305 KMOD_IPSTAT_INC(ips_toosmall); 3306 goto bad; 3307 } 3308 } 3309 ip = mtod(m, struct ip *); 3310 if (ip == NULL) goto bad; 3311 3312 if (ip->ip_v != IPVERSION) { 3313 KMOD_IPSTAT_INC(ips_badvers); 3314 goto bad; 3315 } 3316 hlen = ip->ip_hl << 2; 3317 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3318 KMOD_IPSTAT_INC(ips_badhlen); 3319 goto bad; 3320 } 3321 if (hlen > m->m_len) { 3322 if ((m = m_pullup(m, hlen)) == 0) { 3323 KMOD_IPSTAT_INC(ips_badhlen); 3324 goto bad; 3325 } 3326 ip = mtod(m, struct ip *); 3327 if (ip == NULL) goto bad; 3328 } 3329 3330 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3331 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3332 } else { 3333 if (hlen == sizeof(struct ip)) { 3334 sum = in_cksum_hdr(ip); 3335 } else { 3336 sum = in_cksum(m, hlen); 3337 } 3338 } 3339 if (sum) { 3340 KMOD_IPSTAT_INC(ips_badsum); 3341 goto bad; 3342 } 3343 3344 /* Retrieve the packet length. */ 3345 len = ntohs(ip->ip_len); 3346 3347 /* 3348 * Check for additional length bogosity 3349 */ 3350 if (len < hlen) { 3351 KMOD_IPSTAT_INC(ips_badlen); 3352 goto bad; 3353 } 3354 3355 /* 3356 * Check that the amount of data in the buffers 3357 * is as at least much as the IP header would have us expect. 3358 * Drop packet if shorter than we expect. 3359 */ 3360 if (m->m_pkthdr.len < len) { 3361 KMOD_IPSTAT_INC(ips_tooshort); 3362 goto bad; 3363 } 3364 3365 /* Checks out, proceed */ 3366 *mp = m; 3367 return (0); 3368 3369 bad: 3370 *mp = m; 3371 return (-1); 3372 } 3373 3374 #ifdef INET6 3375 /* 3376 * Same as above, but for IPv6. 3377 * Cut-and-pasted from ip6_input.c. 3378 * XXX Should we update ip6stat, or not? 3379 */ 3380 static int 3381 bridge_ip6_checkbasic(struct mbuf **mp) 3382 { 3383 struct mbuf *m = *mp; 3384 struct ip6_hdr *ip6; 3385 3386 /* 3387 * If the IPv6 header is not aligned, slurp it up into a new 3388 * mbuf with space for link headers, in the event we forward 3389 * it. Otherwise, if it is aligned, make sure the entire base 3390 * IPv6 header is in the first mbuf of the chain. 3391 */ 3392 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3393 struct ifnet *inifp = m->m_pkthdr.rcvif; 3394 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3395 (max_linkhdr + 3) & ~3)) == NULL) { 3396 /* XXXJRT new stat, please */ 3397 V_ip6stat.ip6s_toosmall++; 3398 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3399 goto bad; 3400 } 3401 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3402 struct ifnet *inifp = m->m_pkthdr.rcvif; 3403 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3404 V_ip6stat.ip6s_toosmall++; 3405 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3406 goto bad; 3407 } 3408 } 3409 3410 ip6 = mtod(m, struct ip6_hdr *); 3411 3412 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3413 V_ip6stat.ip6s_badvers++; 3414 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3415 goto bad; 3416 } 3417 3418 /* Checks out, proceed */ 3419 *mp = m; 3420 return (0); 3421 3422 bad: 3423 *mp = m; 3424 return (-1); 3425 } 3426 #endif /* INET6 */ 3427 3428 /* 3429 * bridge_fragment: 3430 * 3431 * Return a fragmented mbuf chain. 3432 */ 3433 static int 3434 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3435 int snap, struct llc *llc) 3436 { 3437 struct mbuf *m0; 3438 struct ip *ip; 3439 int error = -1; 3440 3441 if (m->m_len < sizeof(struct ip) && 3442 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3443 goto out; 3444 ip = mtod(m, struct ip *); 3445 3446 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3447 CSUM_DELAY_IP); 3448 if (error) 3449 goto out; 3450 3451 /* walk the chain and re-add the Ethernet header */ 3452 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3453 if (error == 0) { 3454 if (snap) { 3455 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3456 if (m0 == NULL) { 3457 error = ENOBUFS; 3458 continue; 3459 } 3460 bcopy(llc, mtod(m0, caddr_t), 3461 sizeof(struct llc)); 3462 } 3463 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3464 if (m0 == NULL) { 3465 error = ENOBUFS; 3466 continue; 3467 } 3468 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3469 } else 3470 m_freem(m); 3471 } 3472 3473 if (error == 0) 3474 KMOD_IPSTAT_INC(ips_fragmented); 3475 3476 return (error); 3477 3478 out: 3479 if (m != NULL) 3480 m_freem(m); 3481 return (error); 3482 } 3483 3484 static void 3485 bridge_linkstate(struct ifnet *ifp) 3486 { 3487 struct bridge_softc *sc = ifp->if_bridge; 3488 struct bridge_iflist *bif, *bif2; 3489 int new_link, hasls; 3490 3491 BRIDGE_LOCK(sc); 3492 bif = bridge_lookup_member_if(sc, ifp); 3493 if (bif == NULL) { 3494 BRIDGE_UNLOCK(sc); 3495 return; 3496 } 3497 new_link = LINK_STATE_DOWN; 3498 hasls = 0; 3499 /* Our link is considered up if at least one of our ports is active */ 3500 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 3501 if (bif2->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3502 hasls++; 3503 if (bif2->bif_ifp->if_link_state == LINK_STATE_UP) { 3504 new_link = LINK_STATE_UP; 3505 break; 3506 } 3507 } 3508 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3509 /* If no interfaces support link-state then we default to up */ 3510 new_link = LINK_STATE_UP; 3511 } 3512 if_link_state_change(sc->sc_ifp, new_link); 3513 BRIDGE_UNLOCK(sc); 3514 3515 bstp_linkstate(&bif->bif_stp); 3516 } 3517 3518