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sys/net/if_bridge.c
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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: releng/8.0/sys/net/if_bridge.c 196997 2009-09-08 23:25:39Z jfv $"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 #include "opt_carp.h" 83 84 #include <sys/param.h> 85 #include <sys/mbuf.h> 86 #include <sys/malloc.h> 87 #include <sys/protosw.h> 88 #include <sys/systm.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 #include <sys/rwlock.h> 104 105 #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> 112 113 #include <netinet/in.h> /* for struct arpcom */ 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #ifdef INET6 119 #include <netinet/ip6.h> 120 #include <netinet6/ip6_var.h> 121 #endif 122 #if defined(INET) || defined(INET6) 123 #ifdef DEV_CARP 124 #include <netinet/ip_carp.h> 125 #endif 126 #endif 127 #include <machine/in_cksum.h> 128 #include <netinet/if_ether.h> /* for struct arpcom */ 129 #include <net/bridgestp.h> 130 #include <net/if_bridgevar.h> 131 #include <net/if_llc.h> 132 #include <net/if_vlan_var.h> 133 134 #include <net/route.h> 135 #include <netinet/ip_fw.h> 136 #include <netinet/ip_dummynet.h> 137 138 /* 139 * Size of the route hash table. Must be a power of two. 140 */ 141 #ifndef BRIDGE_RTHASH_SIZE 142 #define BRIDGE_RTHASH_SIZE 1024 143 #endif 144 145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 146 147 /* 148 * Maximum number of addresses to cache. 149 */ 150 #ifndef BRIDGE_RTABLE_MAX 151 #define BRIDGE_RTABLE_MAX 100 152 #endif 153 154 /* 155 * Timeout (in seconds) for entries learned dynamically. 156 */ 157 #ifndef BRIDGE_RTABLE_TIMEOUT 158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 159 #endif 160 161 /* 162 * Number of seconds between walks of the route list. 163 */ 164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 166 #endif 167 168 /* 169 * List of capabilities to possibly mask on the member interface. 170 */ 171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 172 173 /* 174 * List of capabilities to strip 175 */ 176 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 177 178 /* 179 * Bridge interface list entry. 180 */ 181 struct bridge_iflist { 182 LIST_ENTRY(bridge_iflist) bif_next; 183 struct ifnet *bif_ifp; /* member if */ 184 struct bstp_port bif_stp; /* STP state */ 185 uint32_t bif_flags; /* member if flags */ 186 int bif_savedcaps; /* saved capabilities */ 187 uint32_t bif_addrmax; /* max # of addresses */ 188 uint32_t bif_addrcnt; /* cur. # of addresses */ 189 uint32_t bif_addrexceeded;/* # of address violations */ 190 }; 191 192 /* 193 * Bridge route node. 194 */ 195 struct bridge_rtnode { 196 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 197 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 198 struct bridge_iflist *brt_dst; /* destination if */ 199 unsigned long brt_expire; /* expiration time */ 200 uint8_t brt_flags; /* address flags */ 201 uint8_t brt_addr[ETHER_ADDR_LEN]; 202 uint16_t brt_vlan; /* vlan id */ 203 }; 204 #define brt_ifp brt_dst->bif_ifp 205 206 /* 207 * Software state for each bridge. 208 */ 209 struct bridge_softc { 210 struct ifnet *sc_ifp; /* make this an interface */ 211 LIST_ENTRY(bridge_softc) sc_list; 212 struct mtx sc_mtx; 213 struct cv sc_cv; 214 uint32_t sc_brtmax; /* max # of addresses */ 215 uint32_t sc_brtcnt; /* cur. # of addresses */ 216 uint32_t sc_brttimeout; /* rt timeout in seconds */ 217 struct callout sc_brcallout; /* bridge callout */ 218 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 219 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 220 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 221 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 222 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 223 uint32_t sc_rthash_key; /* key for hash */ 224 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 225 struct bstp_state sc_stp; /* STP state */ 226 uint32_t sc_brtexceeded; /* # of cache drops */ 227 struct ifnet *sc_ifaddr; /* member mac copied from */ 228 u_char sc_defaddr[6]; /* Default MAC address */ 229 }; 230 231 static struct mtx bridge_list_mtx; 232 eventhandler_tag bridge_detach_cookie = NULL; 233 234 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 235 236 uma_zone_t bridge_rtnode_zone; 237 238 static int bridge_clone_create(struct if_clone *, int, caddr_t); 239 static void bridge_clone_destroy(struct ifnet *); 240 241 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 242 static void bridge_mutecaps(struct bridge_softc *); 243 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 244 int); 245 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 246 static void bridge_init(void *); 247 static void bridge_dummynet(struct mbuf *, struct ifnet *); 248 static void bridge_stop(struct ifnet *, int); 249 static void bridge_start(struct ifnet *); 250 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 251 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 252 struct rtentry *); 253 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 254 struct mbuf *); 255 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 256 257 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 258 struct mbuf *m); 259 260 static void bridge_timer(void *); 261 262 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 263 struct mbuf *, int); 264 static void bridge_span(struct bridge_softc *, struct mbuf *); 265 266 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 267 uint16_t, struct bridge_iflist *, int, uint8_t); 268 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 269 uint16_t); 270 static void bridge_rttrim(struct bridge_softc *); 271 static void bridge_rtage(struct bridge_softc *); 272 static void bridge_rtflush(struct bridge_softc *, int); 273 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 274 uint16_t); 275 276 static int bridge_rtable_init(struct bridge_softc *); 277 static void bridge_rtable_fini(struct bridge_softc *); 278 279 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 280 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 281 const uint8_t *, uint16_t); 282 static int bridge_rtnode_insert(struct bridge_softc *, 283 struct bridge_rtnode *); 284 static void bridge_rtnode_destroy(struct bridge_softc *, 285 struct bridge_rtnode *); 286 static void bridge_rtable_expire(struct ifnet *, int); 287 static void bridge_state_change(struct ifnet *, int); 288 289 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 290 const char *name); 291 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 292 struct ifnet *ifp); 293 static void bridge_delete_member(struct bridge_softc *, 294 struct bridge_iflist *, int); 295 static void bridge_delete_span(struct bridge_softc *, 296 struct bridge_iflist *); 297 298 static int bridge_ioctl_add(struct bridge_softc *, void *); 299 static int bridge_ioctl_del(struct bridge_softc *, void *); 300 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 301 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 302 static int bridge_ioctl_scache(struct bridge_softc *, void *); 303 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 304 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 305 static int bridge_ioctl_rts(struct bridge_softc *, void *); 306 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 307 static int bridge_ioctl_sto(struct bridge_softc *, void *); 308 static int bridge_ioctl_gto(struct bridge_softc *, void *); 309 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 310 static int bridge_ioctl_flush(struct bridge_softc *, void *); 311 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 312 static int bridge_ioctl_spri(struct bridge_softc *, void *); 313 static int bridge_ioctl_ght(struct bridge_softc *, void *); 314 static int bridge_ioctl_sht(struct bridge_softc *, void *); 315 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 316 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 317 static int bridge_ioctl_gma(struct bridge_softc *, void *); 318 static int bridge_ioctl_sma(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 321 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 322 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 323 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 324 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 325 static int bridge_ioctl_grte(struct bridge_softc *, void *); 326 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 327 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 328 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 329 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 330 int); 331 static int bridge_ip_checkbasic(struct mbuf **mp); 332 #ifdef INET6 333 static int bridge_ip6_checkbasic(struct mbuf **mp); 334 #endif /* INET6 */ 335 static int bridge_fragment(struct ifnet *, struct mbuf *, 336 struct ether_header *, int, struct llc *); 337 338 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 339 #define VLANTAGOF(_m) \ 340 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 341 342 static struct bstp_cb_ops bridge_ops = { 343 .bcb_state = bridge_state_change, 344 .bcb_rtage = bridge_rtable_expire 345 }; 346 347 SYSCTL_DECL(_net_link); 348 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 349 350 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 351 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 352 static int pfil_member = 1; /* run pfil hooks on the member interface */ 353 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 354 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 355 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 356 locally destined packets */ 357 static int log_stp = 0; /* log STP state changes */ 358 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 360 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 362 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 364 &pfil_bridge, 0, "Packet filter on the bridge interface"); 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 366 &pfil_member, 0, "Packet filter on the member interface"); 367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 368 &pfil_local_phys, 0, 369 "Packet filter on the physical interface for locally destined packets"); 370 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 371 &log_stp, 0, "Log STP state changes"); 372 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 373 &bridge_inherit_mac, 0, 374 "Inherit MAC address from the first bridge member"); 375 376 struct bridge_control { 377 int (*bc_func)(struct bridge_softc *, void *); 378 int bc_argsize; 379 int bc_flags; 380 }; 381 382 #define BC_F_COPYIN 0x01 /* copy arguments in */ 383 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 384 #define BC_F_SUSER 0x04 /* do super-user check */ 385 386 const struct bridge_control bridge_control_table[] = { 387 { bridge_ioctl_add, sizeof(struct ifbreq), 388 BC_F_COPYIN|BC_F_SUSER }, 389 { bridge_ioctl_del, sizeof(struct ifbreq), 390 BC_F_COPYIN|BC_F_SUSER }, 391 392 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 393 BC_F_COPYIN|BC_F_COPYOUT }, 394 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 395 BC_F_COPYIN|BC_F_SUSER }, 396 397 { bridge_ioctl_scache, sizeof(struct ifbrparam), 398 BC_F_COPYIN|BC_F_SUSER }, 399 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 400 BC_F_COPYOUT }, 401 402 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 403 BC_F_COPYIN|BC_F_COPYOUT }, 404 { bridge_ioctl_rts, sizeof(struct ifbaconf), 405 BC_F_COPYIN|BC_F_COPYOUT }, 406 407 { bridge_ioctl_saddr, sizeof(struct ifbareq), 408 BC_F_COPYIN|BC_F_SUSER }, 409 410 { bridge_ioctl_sto, sizeof(struct ifbrparam), 411 BC_F_COPYIN|BC_F_SUSER }, 412 { bridge_ioctl_gto, sizeof(struct ifbrparam), 413 BC_F_COPYOUT }, 414 415 { bridge_ioctl_daddr, sizeof(struct ifbareq), 416 BC_F_COPYIN|BC_F_SUSER }, 417 418 { bridge_ioctl_flush, sizeof(struct ifbreq), 419 BC_F_COPYIN|BC_F_SUSER }, 420 421 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 422 BC_F_COPYOUT }, 423 { bridge_ioctl_spri, sizeof(struct ifbrparam), 424 BC_F_COPYIN|BC_F_SUSER }, 425 426 { bridge_ioctl_ght, sizeof(struct ifbrparam), 427 BC_F_COPYOUT }, 428 { bridge_ioctl_sht, sizeof(struct ifbrparam), 429 BC_F_COPYIN|BC_F_SUSER }, 430 431 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 432 BC_F_COPYOUT }, 433 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_gma, sizeof(struct ifbrparam), 437 BC_F_COPYOUT }, 438 { bridge_ioctl_sma, sizeof(struct ifbrparam), 439 BC_F_COPYIN|BC_F_SUSER }, 440 441 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 442 BC_F_COPYIN|BC_F_SUSER }, 443 444 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 445 BC_F_COPYIN|BC_F_SUSER }, 446 447 { bridge_ioctl_addspan, sizeof(struct ifbreq), 448 BC_F_COPYIN|BC_F_SUSER }, 449 { bridge_ioctl_delspan, sizeof(struct ifbreq), 450 BC_F_COPYIN|BC_F_SUSER }, 451 452 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 453 BC_F_COPYOUT }, 454 455 { bridge_ioctl_grte, sizeof(struct ifbrparam), 456 BC_F_COPYOUT }, 457 458 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 459 BC_F_COPYIN|BC_F_COPYOUT }, 460 461 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 462 BC_F_COPYIN|BC_F_SUSER }, 463 464 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 465 BC_F_COPYIN|BC_F_SUSER }, 466 467 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 468 BC_F_COPYIN|BC_F_SUSER }, 469 470 }; 471 const int bridge_control_table_size = 472 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 473 474 LIST_HEAD(, bridge_softc) bridge_list; 475 476 IFC_SIMPLE_DECLARE(bridge, 0); 477 478 static int 479 bridge_modevent(module_t mod, int type, void *data) 480 { 481 482 switch (type) { 483 case MOD_LOAD: 484 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 485 if_clone_attach(&bridge_cloner); 486 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 487 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 488 UMA_ALIGN_PTR, 0); 489 LIST_INIT(&bridge_list); 490 bridge_input_p = bridge_input; 491 bridge_output_p = bridge_output; 492 bridge_dn_p = bridge_dummynet; 493 bridge_detach_cookie = EVENTHANDLER_REGISTER( 494 ifnet_departure_event, bridge_ifdetach, NULL, 495 EVENTHANDLER_PRI_ANY); 496 break; 497 case MOD_UNLOAD: 498 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 499 bridge_detach_cookie); 500 if_clone_detach(&bridge_cloner); 501 uma_zdestroy(bridge_rtnode_zone); 502 bridge_input_p = NULL; 503 bridge_output_p = NULL; 504 bridge_dn_p = NULL; 505 mtx_destroy(&bridge_list_mtx); 506 break; 507 default: 508 return (EOPNOTSUPP); 509 } 510 return (0); 511 } 512 513 static moduledata_t bridge_mod = { 514 "if_bridge", 515 bridge_modevent, 516 0 517 }; 518 519 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 520 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 521 522 /* 523 * handler for net.link.bridge.pfil_ipfw 524 */ 525 static int 526 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 527 { 528 int enable = pfil_ipfw; 529 int error; 530 531 error = sysctl_handle_int(oidp, &enable, 0, req); 532 enable = (enable) ? 1 : 0; 533 534 if (enable != pfil_ipfw) { 535 pfil_ipfw = enable; 536 537 /* 538 * Disable pfil so that ipfw doesnt run twice, if the user 539 * really wants both then they can re-enable pfil_bridge and/or 540 * pfil_member. Also allow non-ip packets as ipfw can filter by 541 * layer2 type. 542 */ 543 if (pfil_ipfw) { 544 pfil_onlyip = 0; 545 pfil_bridge = 0; 546 pfil_member = 0; 547 } 548 } 549 550 return (error); 551 } 552 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 553 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 554 555 /* 556 * bridge_clone_create: 557 * 558 * Create a new bridge instance. 559 */ 560 static int 561 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 562 { 563 struct bridge_softc *sc, *sc2; 564 struct ifnet *bifp, *ifp; 565 int retry; 566 567 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 568 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 569 if (ifp == NULL) { 570 free(sc, M_DEVBUF); 571 return (ENOSPC); 572 } 573 574 BRIDGE_LOCK_INIT(sc); 575 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 576 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 577 578 /* Initialize our routing table. */ 579 bridge_rtable_init(sc); 580 581 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 582 583 LIST_INIT(&sc->sc_iflist); 584 LIST_INIT(&sc->sc_spanlist); 585 586 ifp->if_softc = sc; 587 if_initname(ifp, ifc->ifc_name, unit); 588 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 589 ifp->if_ioctl = bridge_ioctl; 590 ifp->if_start = bridge_start; 591 ifp->if_init = bridge_init; 592 ifp->if_type = IFT_BRIDGE; 593 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 594 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 595 IFQ_SET_READY(&ifp->if_snd); 596 597 /* 598 * Generate a random ethernet address with a locally administered 599 * address. 600 * 601 * Since we are using random ethernet addresses for the bridge, it is 602 * possible that we might have address collisions, so make sure that 603 * this hardware address isn't already in use on another bridge. 604 */ 605 for (retry = 1; retry != 0;) { 606 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 607 sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ 608 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 609 retry = 0; 610 mtx_lock(&bridge_list_mtx); 611 LIST_FOREACH(sc2, &bridge_list, sc_list) { 612 bifp = sc2->sc_ifp; 613 if (memcmp(sc->sc_defaddr, 614 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 615 retry = 1; 616 } 617 mtx_unlock(&bridge_list_mtx); 618 } 619 620 bstp_attach(&sc->sc_stp, &bridge_ops); 621 ether_ifattach(ifp, sc->sc_defaddr); 622 /* Now undo some of the damage... */ 623 ifp->if_baudrate = 0; 624 ifp->if_type = IFT_BRIDGE; 625 626 mtx_lock(&bridge_list_mtx); 627 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 628 mtx_unlock(&bridge_list_mtx); 629 630 return (0); 631 } 632 633 /* 634 * bridge_clone_destroy: 635 * 636 * Destroy a bridge instance. 637 */ 638 static void 639 bridge_clone_destroy(struct ifnet *ifp) 640 { 641 struct bridge_softc *sc = ifp->if_softc; 642 struct bridge_iflist *bif; 643 644 BRIDGE_LOCK(sc); 645 646 bridge_stop(ifp, 1); 647 ifp->if_flags &= ~IFF_UP; 648 649 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 650 bridge_delete_member(sc, bif, 0); 651 652 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 653 bridge_delete_span(sc, bif); 654 } 655 656 BRIDGE_UNLOCK(sc); 657 658 callout_drain(&sc->sc_brcallout); 659 660 mtx_lock(&bridge_list_mtx); 661 LIST_REMOVE(sc, sc_list); 662 mtx_unlock(&bridge_list_mtx); 663 664 bstp_detach(&sc->sc_stp); 665 ether_ifdetach(ifp); 666 if_free_type(ifp, IFT_ETHER); 667 668 /* Tear down the routing table. */ 669 bridge_rtable_fini(sc); 670 671 BRIDGE_LOCK_DESTROY(sc); 672 free(sc, M_DEVBUF); 673 } 674 675 /* 676 * bridge_ioctl: 677 * 678 * Handle a control request from the operator. 679 */ 680 static int 681 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 682 { 683 struct bridge_softc *sc = ifp->if_softc; 684 struct thread *td = curthread; 685 union { 686 struct ifbreq ifbreq; 687 struct ifbifconf ifbifconf; 688 struct ifbareq ifbareq; 689 struct ifbaconf ifbaconf; 690 struct ifbrparam ifbrparam; 691 struct ifbropreq ifbropreq; 692 } args; 693 struct ifdrv *ifd = (struct ifdrv *) data; 694 const struct bridge_control *bc; 695 int error = 0; 696 697 switch (cmd) { 698 699 case SIOCADDMULTI: 700 case SIOCDELMULTI: 701 break; 702 703 case SIOCGDRVSPEC: 704 case SIOCSDRVSPEC: 705 if (ifd->ifd_cmd >= bridge_control_table_size) { 706 error = EINVAL; 707 break; 708 } 709 bc = &bridge_control_table[ifd->ifd_cmd]; 710 711 if (cmd == SIOCGDRVSPEC && 712 (bc->bc_flags & BC_F_COPYOUT) == 0) { 713 error = EINVAL; 714 break; 715 } 716 else if (cmd == SIOCSDRVSPEC && 717 (bc->bc_flags & BC_F_COPYOUT) != 0) { 718 error = EINVAL; 719 break; 720 } 721 722 if (bc->bc_flags & BC_F_SUSER) { 723 error = priv_check(td, PRIV_NET_BRIDGE); 724 if (error) 725 break; 726 } 727 728 if (ifd->ifd_len != bc->bc_argsize || 729 ifd->ifd_len > sizeof(args)) { 730 error = EINVAL; 731 break; 732 } 733 734 bzero(&args, sizeof(args)); 735 if (bc->bc_flags & BC_F_COPYIN) { 736 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 737 if (error) 738 break; 739 } 740 741 BRIDGE_LOCK(sc); 742 error = (*bc->bc_func)(sc, &args); 743 BRIDGE_UNLOCK(sc); 744 if (error) 745 break; 746 747 if (bc->bc_flags & BC_F_COPYOUT) 748 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 749 750 break; 751 752 case SIOCSIFFLAGS: 753 if (!(ifp->if_flags & IFF_UP) && 754 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 755 /* 756 * If interface is marked down and it is running, 757 * then stop and disable it. 758 */ 759 BRIDGE_LOCK(sc); 760 bridge_stop(ifp, 1); 761 BRIDGE_UNLOCK(sc); 762 } else if ((ifp->if_flags & IFF_UP) && 763 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 764 /* 765 * If interface is marked up and it is stopped, then 766 * start it. 767 */ 768 (*ifp->if_init)(sc); 769 } 770 break; 771 772 case SIOCSIFMTU: 773 /* Do not allow the MTU to be changed on the bridge */ 774 error = EINVAL; 775 break; 776 777 default: 778 /* 779 * drop the lock as ether_ioctl() will call bridge_start() and 780 * cause the lock to be recursed. 781 */ 782 error = ether_ioctl(ifp, cmd, data); 783 break; 784 } 785 786 return (error); 787 } 788 789 /* 790 * bridge_mutecaps: 791 * 792 * Clear or restore unwanted capabilities on the member interface 793 */ 794 static void 795 bridge_mutecaps(struct bridge_softc *sc) 796 { 797 struct bridge_iflist *bif; 798 int enabled, mask; 799 800 /* Initial bitmask of capabilities to test */ 801 mask = BRIDGE_IFCAPS_MASK; 802 803 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 804 /* Every member must support it or its disabled */ 805 mask &= bif->bif_savedcaps; 806 } 807 808 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 809 enabled = bif->bif_ifp->if_capenable; 810 enabled &= ~BRIDGE_IFCAPS_STRIP; 811 /* strip off mask bits and enable them again if allowed */ 812 enabled &= ~BRIDGE_IFCAPS_MASK; 813 enabled |= mask; 814 bridge_set_ifcap(sc, bif, enabled); 815 } 816 817 } 818 819 static void 820 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 821 { 822 struct ifnet *ifp = bif->bif_ifp; 823 struct ifreq ifr; 824 int error; 825 826 bzero(&ifr, sizeof(ifr)); 827 ifr.ifr_reqcap = set; 828 829 if (ifp->if_capenable != set) { 830 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 831 if (error) 832 if_printf(sc->sc_ifp, 833 "error setting interface capabilities on %s\n", 834 ifp->if_xname); 835 } 836 } 837 838 /* 839 * bridge_lookup_member: 840 * 841 * Lookup a bridge member interface. 842 */ 843 static struct bridge_iflist * 844 bridge_lookup_member(struct bridge_softc *sc, const char *name) 845 { 846 struct bridge_iflist *bif; 847 struct ifnet *ifp; 848 849 BRIDGE_LOCK_ASSERT(sc); 850 851 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 852 ifp = bif->bif_ifp; 853 if (strcmp(ifp->if_xname, name) == 0) 854 return (bif); 855 } 856 857 return (NULL); 858 } 859 860 /* 861 * bridge_lookup_member_if: 862 * 863 * Lookup a bridge member interface by ifnet*. 864 */ 865 static struct bridge_iflist * 866 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 867 { 868 struct bridge_iflist *bif; 869 870 BRIDGE_LOCK_ASSERT(sc); 871 872 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 873 if (bif->bif_ifp == member_ifp) 874 return (bif); 875 } 876 877 return (NULL); 878 } 879 880 /* 881 * bridge_delete_member: 882 * 883 * Delete the specified member interface. 884 */ 885 static void 886 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 887 int gone) 888 { 889 struct ifnet *ifs = bif->bif_ifp; 890 struct ifnet *fif = NULL; 891 892 BRIDGE_LOCK_ASSERT(sc); 893 894 if (bif->bif_flags & IFBIF_STP) 895 bstp_disable(&bif->bif_stp); 896 897 ifs->if_bridge = NULL; 898 BRIDGE_XLOCK(sc); 899 LIST_REMOVE(bif, bif_next); 900 BRIDGE_XDROP(sc); 901 902 /* 903 * If removing the interface that gave the bridge its mac address, set 904 * the mac address of the bridge to the address of the next member, or 905 * to its default address if no members are left. 906 */ 907 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 908 if (LIST_EMPTY(&sc->sc_iflist)) { 909 bcopy(sc->sc_defaddr, 910 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 911 sc->sc_ifaddr = NULL; 912 } else { 913 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 914 bcopy(IF_LLADDR(fif), 915 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 916 sc->sc_ifaddr = fif; 917 } 918 } 919 920 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 921 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 922 KASSERT(bif->bif_addrcnt == 0, 923 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 924 925 BRIDGE_UNLOCK(sc); 926 if (!gone) { 927 switch (ifs->if_type) { 928 case IFT_ETHER: 929 case IFT_L2VLAN: 930 /* 931 * Take the interface out of promiscuous mode. 932 */ 933 (void) ifpromisc(ifs, 0); 934 break; 935 936 case IFT_GIF: 937 break; 938 939 default: 940 #ifdef DIAGNOSTIC 941 panic("bridge_delete_member: impossible"); 942 #endif 943 break; 944 } 945 /* reneable any interface capabilities */ 946 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 947 } 948 bstp_destroy(&bif->bif_stp); /* prepare to free */ 949 BRIDGE_LOCK(sc); 950 free(bif, M_DEVBUF); 951 } 952 953 /* 954 * bridge_delete_span: 955 * 956 * Delete the specified span interface. 957 */ 958 static void 959 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 960 { 961 BRIDGE_LOCK_ASSERT(sc); 962 963 KASSERT(bif->bif_ifp->if_bridge == NULL, 964 ("%s: not a span interface", __func__)); 965 966 LIST_REMOVE(bif, bif_next); 967 free(bif, M_DEVBUF); 968 } 969 970 static int 971 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 972 { 973 struct ifbreq *req = arg; 974 struct bridge_iflist *bif = NULL; 975 struct ifnet *ifs; 976 int error = 0; 977 978 ifs = ifunit(req->ifbr_ifsname); 979 if (ifs == NULL) 980 return (ENOENT); 981 if (ifs->if_ioctl == NULL) /* must be supported */ 982 return (EINVAL); 983 984 /* If it's in the span list, it can't be a member. */ 985 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 986 if (ifs == bif->bif_ifp) 987 return (EBUSY); 988 989 /* Allow the first Ethernet member to define the MTU */ 990 if (ifs->if_type != IFT_GIF) { 991 if (LIST_EMPTY(&sc->sc_iflist)) 992 sc->sc_ifp->if_mtu = ifs->if_mtu; 993 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 994 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 995 ifs->if_xname); 996 return (EINVAL); 997 } 998 } 999 1000 if (ifs->if_bridge == sc) 1001 return (EEXIST); 1002 1003 if (ifs->if_bridge != NULL) 1004 return (EBUSY); 1005 1006 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1007 if (bif == NULL) 1008 return (ENOMEM); 1009 1010 bif->bif_ifp = ifs; 1011 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1012 bif->bif_savedcaps = ifs->if_capenable; 1013 1014 switch (ifs->if_type) { 1015 case IFT_ETHER: 1016 case IFT_L2VLAN: 1017 case IFT_GIF: 1018 /* permitted interface types */ 1019 break; 1020 default: 1021 error = EINVAL; 1022 goto out; 1023 } 1024 1025 /* 1026 * Assign the interface's MAC address to the bridge if it's the first 1027 * member and the MAC address of the bridge has not been changed from 1028 * the default randomly generated one. 1029 */ 1030 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1031 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1032 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1033 sc->sc_ifaddr = ifs; 1034 } 1035 1036 ifs->if_bridge = sc; 1037 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1038 /* 1039 * XXX: XLOCK HERE!?! 1040 * 1041 * NOTE: insert_***HEAD*** should be safe for the traversals. 1042 */ 1043 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1044 1045 /* Set interface capabilities to the intersection set of all members */ 1046 bridge_mutecaps(sc); 1047 1048 switch (ifs->if_type) { 1049 case IFT_ETHER: 1050 case IFT_L2VLAN: 1051 /* 1052 * Place the interface into promiscuous mode. 1053 */ 1054 BRIDGE_UNLOCK(sc); 1055 error = ifpromisc(ifs, 1); 1056 BRIDGE_LOCK(sc); 1057 break; 1058 } 1059 if (error) 1060 bridge_delete_member(sc, bif, 0); 1061 out: 1062 if (error) { 1063 if (bif != NULL) 1064 free(bif, M_DEVBUF); 1065 } 1066 return (error); 1067 } 1068 1069 static int 1070 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1071 { 1072 struct ifbreq *req = arg; 1073 struct bridge_iflist *bif; 1074 1075 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1076 if (bif == NULL) 1077 return (ENOENT); 1078 1079 bridge_delete_member(sc, bif, 0); 1080 1081 return (0); 1082 } 1083 1084 static int 1085 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1086 { 1087 struct ifbreq *req = arg; 1088 struct bridge_iflist *bif; 1089 struct bstp_port *bp; 1090 1091 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1092 if (bif == NULL) 1093 return (ENOENT); 1094 1095 bp = &bif->bif_stp; 1096 req->ifbr_ifsflags = bif->bif_flags; 1097 req->ifbr_state = bp->bp_state; 1098 req->ifbr_priority = bp->bp_priority; 1099 req->ifbr_path_cost = bp->bp_path_cost; 1100 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1101 req->ifbr_proto = bp->bp_protover; 1102 req->ifbr_role = bp->bp_role; 1103 req->ifbr_stpflags = bp->bp_flags; 1104 req->ifbr_addrcnt = bif->bif_addrcnt; 1105 req->ifbr_addrmax = bif->bif_addrmax; 1106 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1107 1108 /* Copy STP state options as flags */ 1109 if (bp->bp_operedge) 1110 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1111 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1112 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1113 if (bp->bp_ptp_link) 1114 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1115 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1116 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1117 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1118 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1119 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1120 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1121 return (0); 1122 } 1123 1124 static int 1125 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1126 { 1127 struct ifbreq *req = arg; 1128 struct bridge_iflist *bif; 1129 struct bstp_port *bp; 1130 int error; 1131 1132 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1133 if (bif == NULL) 1134 return (ENOENT); 1135 bp = &bif->bif_stp; 1136 1137 if (req->ifbr_ifsflags & IFBIF_SPAN) 1138 /* SPAN is readonly */ 1139 return (EINVAL); 1140 1141 if (req->ifbr_ifsflags & IFBIF_STP) { 1142 if ((bif->bif_flags & IFBIF_STP) == 0) { 1143 error = bstp_enable(&bif->bif_stp); 1144 if (error) 1145 return (error); 1146 } 1147 } else { 1148 if ((bif->bif_flags & IFBIF_STP) != 0) 1149 bstp_disable(&bif->bif_stp); 1150 } 1151 1152 /* Pass on STP flags */ 1153 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1154 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1155 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1156 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1157 1158 /* Save the bits relating to the bridge */ 1159 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1160 1161 return (0); 1162 } 1163 1164 static int 1165 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1166 { 1167 struct ifbrparam *param = arg; 1168 1169 sc->sc_brtmax = param->ifbrp_csize; 1170 bridge_rttrim(sc); 1171 1172 return (0); 1173 } 1174 1175 static int 1176 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1177 { 1178 struct ifbrparam *param = arg; 1179 1180 param->ifbrp_csize = sc->sc_brtmax; 1181 1182 return (0); 1183 } 1184 1185 static int 1186 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1187 { 1188 struct ifbifconf *bifc = arg; 1189 struct bridge_iflist *bif; 1190 struct ifbreq breq; 1191 char *buf, *outbuf; 1192 int count, buflen, len, error = 0; 1193 1194 count = 0; 1195 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1196 count++; 1197 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1198 count++; 1199 1200 buflen = sizeof(breq) * count; 1201 if (bifc->ifbic_len == 0) { 1202 bifc->ifbic_len = buflen; 1203 return (0); 1204 } 1205 BRIDGE_UNLOCK(sc); 1206 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1207 BRIDGE_LOCK(sc); 1208 1209 count = 0; 1210 buf = outbuf; 1211 len = min(bifc->ifbic_len, buflen); 1212 bzero(&breq, sizeof(breq)); 1213 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1214 if (len < sizeof(breq)) 1215 break; 1216 1217 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1218 sizeof(breq.ifbr_ifsname)); 1219 /* Fill in the ifbreq structure */ 1220 error = bridge_ioctl_gifflags(sc, &breq); 1221 if (error) 1222 break; 1223 memcpy(buf, &breq, sizeof(breq)); 1224 count++; 1225 buf += sizeof(breq); 1226 len -= sizeof(breq); 1227 } 1228 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1229 if (len < sizeof(breq)) 1230 break; 1231 1232 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1233 sizeof(breq.ifbr_ifsname)); 1234 breq.ifbr_ifsflags = bif->bif_flags; 1235 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1236 memcpy(buf, &breq, sizeof(breq)); 1237 count++; 1238 buf += sizeof(breq); 1239 len -= sizeof(breq); 1240 } 1241 1242 BRIDGE_UNLOCK(sc); 1243 bifc->ifbic_len = sizeof(breq) * count; 1244 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1245 BRIDGE_LOCK(sc); 1246 free(outbuf, M_TEMP); 1247 return (error); 1248 } 1249 1250 static int 1251 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1252 { 1253 struct ifbaconf *bac = arg; 1254 struct bridge_rtnode *brt; 1255 struct ifbareq bareq; 1256 char *buf, *outbuf; 1257 int count, buflen, len, error = 0; 1258 1259 if (bac->ifbac_len == 0) 1260 return (0); 1261 1262 count = 0; 1263 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1264 count++; 1265 buflen = sizeof(bareq) * count; 1266 1267 BRIDGE_UNLOCK(sc); 1268 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1269 BRIDGE_LOCK(sc); 1270 1271 count = 0; 1272 buf = outbuf; 1273 len = min(bac->ifbac_len, buflen); 1274 bzero(&bareq, sizeof(bareq)); 1275 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1276 if (len < sizeof(bareq)) 1277 goto out; 1278 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1279 sizeof(bareq.ifba_ifsname)); 1280 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1281 bareq.ifba_vlan = brt->brt_vlan; 1282 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1283 time_uptime < brt->brt_expire) 1284 bareq.ifba_expire = brt->brt_expire - time_uptime; 1285 else 1286 bareq.ifba_expire = 0; 1287 bareq.ifba_flags = brt->brt_flags; 1288 1289 memcpy(buf, &bareq, sizeof(bareq)); 1290 count++; 1291 buf += sizeof(bareq); 1292 len -= sizeof(bareq); 1293 } 1294 out: 1295 BRIDGE_UNLOCK(sc); 1296 bac->ifbac_len = sizeof(bareq) * count; 1297 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1298 BRIDGE_LOCK(sc); 1299 free(outbuf, M_TEMP); 1300 return (error); 1301 } 1302 1303 static int 1304 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1305 { 1306 struct ifbareq *req = arg; 1307 struct bridge_iflist *bif; 1308 int error; 1309 1310 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1311 if (bif == NULL) 1312 return (ENOENT); 1313 1314 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1315 req->ifba_flags); 1316 1317 return (error); 1318 } 1319 1320 static int 1321 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1322 { 1323 struct ifbrparam *param = arg; 1324 1325 sc->sc_brttimeout = param->ifbrp_ctime; 1326 return (0); 1327 } 1328 1329 static int 1330 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1331 { 1332 struct ifbrparam *param = arg; 1333 1334 param->ifbrp_ctime = sc->sc_brttimeout; 1335 return (0); 1336 } 1337 1338 static int 1339 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1340 { 1341 struct ifbareq *req = arg; 1342 1343 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1344 } 1345 1346 static int 1347 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1348 { 1349 struct ifbreq *req = arg; 1350 1351 bridge_rtflush(sc, req->ifbr_ifsflags); 1352 return (0); 1353 } 1354 1355 static int 1356 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1357 { 1358 struct ifbrparam *param = arg; 1359 struct bstp_state *bs = &sc->sc_stp; 1360 1361 param->ifbrp_prio = bs->bs_bridge_priority; 1362 return (0); 1363 } 1364 1365 static int 1366 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1367 { 1368 struct ifbrparam *param = arg; 1369 1370 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1371 } 1372 1373 static int 1374 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1375 { 1376 struct ifbrparam *param = arg; 1377 struct bstp_state *bs = &sc->sc_stp; 1378 1379 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1380 return (0); 1381 } 1382 1383 static int 1384 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1385 { 1386 struct ifbrparam *param = arg; 1387 1388 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1389 } 1390 1391 static int 1392 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1393 { 1394 struct ifbrparam *param = arg; 1395 struct bstp_state *bs = &sc->sc_stp; 1396 1397 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1398 return (0); 1399 } 1400 1401 static int 1402 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1403 { 1404 struct ifbrparam *param = arg; 1405 1406 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1407 } 1408 1409 static int 1410 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1411 { 1412 struct ifbrparam *param = arg; 1413 struct bstp_state *bs = &sc->sc_stp; 1414 1415 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1416 return (0); 1417 } 1418 1419 static int 1420 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1421 { 1422 struct ifbrparam *param = arg; 1423 1424 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1425 } 1426 1427 static int 1428 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1429 { 1430 struct ifbreq *req = arg; 1431 struct bridge_iflist *bif; 1432 1433 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1434 if (bif == NULL) 1435 return (ENOENT); 1436 1437 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1438 } 1439 1440 static int 1441 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1442 { 1443 struct ifbreq *req = arg; 1444 struct bridge_iflist *bif; 1445 1446 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1447 if (bif == NULL) 1448 return (ENOENT); 1449 1450 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1451 } 1452 1453 static int 1454 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1455 { 1456 struct ifbreq *req = arg; 1457 struct bridge_iflist *bif; 1458 1459 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1460 if (bif == NULL) 1461 return (ENOENT); 1462 1463 bif->bif_addrmax = req->ifbr_addrmax; 1464 return (0); 1465 } 1466 1467 static int 1468 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1469 { 1470 struct ifbreq *req = arg; 1471 struct bridge_iflist *bif = NULL; 1472 struct ifnet *ifs; 1473 1474 ifs = ifunit(req->ifbr_ifsname); 1475 if (ifs == NULL) 1476 return (ENOENT); 1477 1478 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1479 if (ifs == bif->bif_ifp) 1480 return (EBUSY); 1481 1482 if (ifs->if_bridge != NULL) 1483 return (EBUSY); 1484 1485 switch (ifs->if_type) { 1486 case IFT_ETHER: 1487 case IFT_GIF: 1488 case IFT_L2VLAN: 1489 break; 1490 default: 1491 return (EINVAL); 1492 } 1493 1494 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1495 if (bif == NULL) 1496 return (ENOMEM); 1497 1498 bif->bif_ifp = ifs; 1499 bif->bif_flags = IFBIF_SPAN; 1500 1501 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1502 1503 return (0); 1504 } 1505 1506 static int 1507 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1508 { 1509 struct ifbreq *req = arg; 1510 struct bridge_iflist *bif; 1511 struct ifnet *ifs; 1512 1513 ifs = ifunit(req->ifbr_ifsname); 1514 if (ifs == NULL) 1515 return (ENOENT); 1516 1517 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1518 if (ifs == bif->bif_ifp) 1519 break; 1520 1521 if (bif == NULL) 1522 return (ENOENT); 1523 1524 bridge_delete_span(sc, bif); 1525 1526 return (0); 1527 } 1528 1529 static int 1530 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1531 { 1532 struct ifbropreq *req = arg; 1533 struct bstp_state *bs = &sc->sc_stp; 1534 struct bstp_port *root_port; 1535 1536 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1537 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1538 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1539 1540 root_port = bs->bs_root_port; 1541 if (root_port == NULL) 1542 req->ifbop_root_port = 0; 1543 else 1544 req->ifbop_root_port = root_port->bp_ifp->if_index; 1545 1546 req->ifbop_holdcount = bs->bs_txholdcount; 1547 req->ifbop_priority = bs->bs_bridge_priority; 1548 req->ifbop_protocol = bs->bs_protover; 1549 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1550 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1551 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1552 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1553 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1554 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1555 1556 return (0); 1557 } 1558 1559 static int 1560 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1561 { 1562 struct ifbrparam *param = arg; 1563 1564 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1565 return (0); 1566 } 1567 1568 static int 1569 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1570 { 1571 struct ifbpstpconf *bifstp = arg; 1572 struct bridge_iflist *bif; 1573 struct bstp_port *bp; 1574 struct ifbpstpreq bpreq; 1575 char *buf, *outbuf; 1576 int count, buflen, len, error = 0; 1577 1578 count = 0; 1579 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1580 if ((bif->bif_flags & IFBIF_STP) != 0) 1581 count++; 1582 } 1583 1584 buflen = sizeof(bpreq) * count; 1585 if (bifstp->ifbpstp_len == 0) { 1586 bifstp->ifbpstp_len = buflen; 1587 return (0); 1588 } 1589 1590 BRIDGE_UNLOCK(sc); 1591 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1592 BRIDGE_LOCK(sc); 1593 1594 count = 0; 1595 buf = outbuf; 1596 len = min(bifstp->ifbpstp_len, buflen); 1597 bzero(&bpreq, sizeof(bpreq)); 1598 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1599 if (len < sizeof(bpreq)) 1600 break; 1601 1602 if ((bif->bif_flags & IFBIF_STP) == 0) 1603 continue; 1604 1605 bp = &bif->bif_stp; 1606 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1607 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1608 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1609 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1610 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1611 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1612 1613 memcpy(buf, &bpreq, sizeof(bpreq)); 1614 count++; 1615 buf += sizeof(bpreq); 1616 len -= sizeof(bpreq); 1617 } 1618 1619 BRIDGE_UNLOCK(sc); 1620 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1621 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1622 BRIDGE_LOCK(sc); 1623 free(outbuf, M_TEMP); 1624 return (error); 1625 } 1626 1627 static int 1628 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1629 { 1630 struct ifbrparam *param = arg; 1631 1632 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1633 } 1634 1635 static int 1636 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1637 { 1638 struct ifbrparam *param = arg; 1639 1640 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1641 } 1642 1643 /* 1644 * bridge_ifdetach: 1645 * 1646 * Detach an interface from a bridge. Called when a member 1647 * interface is detaching. 1648 */ 1649 static void 1650 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1651 { 1652 struct bridge_softc *sc = ifp->if_bridge; 1653 struct bridge_iflist *bif; 1654 1655 /* Check if the interface is a bridge member */ 1656 if (sc != NULL) { 1657 BRIDGE_LOCK(sc); 1658 1659 bif = bridge_lookup_member_if(sc, ifp); 1660 if (bif != NULL) 1661 bridge_delete_member(sc, bif, 1); 1662 1663 BRIDGE_UNLOCK(sc); 1664 return; 1665 } 1666 1667 /* Check if the interface is a span port */ 1668 mtx_lock(&bridge_list_mtx); 1669 LIST_FOREACH(sc, &bridge_list, sc_list) { 1670 BRIDGE_LOCK(sc); 1671 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1672 if (ifp == bif->bif_ifp) { 1673 bridge_delete_span(sc, bif); 1674 break; 1675 } 1676 1677 BRIDGE_UNLOCK(sc); 1678 } 1679 mtx_unlock(&bridge_list_mtx); 1680 } 1681 1682 /* 1683 * bridge_init: 1684 * 1685 * Initialize a bridge interface. 1686 */ 1687 static void 1688 bridge_init(void *xsc) 1689 { 1690 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1691 struct ifnet *ifp = sc->sc_ifp; 1692 1693 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1694 return; 1695 1696 BRIDGE_LOCK(sc); 1697 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1698 bridge_timer, sc); 1699 1700 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1701 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1702 1703 BRIDGE_UNLOCK(sc); 1704 } 1705 1706 /* 1707 * bridge_stop: 1708 * 1709 * Stop the bridge interface. 1710 */ 1711 static void 1712 bridge_stop(struct ifnet *ifp, int disable) 1713 { 1714 struct bridge_softc *sc = ifp->if_softc; 1715 1716 BRIDGE_LOCK_ASSERT(sc); 1717 1718 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1719 return; 1720 1721 callout_stop(&sc->sc_brcallout); 1722 bstp_stop(&sc->sc_stp); 1723 1724 bridge_rtflush(sc, IFBF_FLUSHDYN); 1725 1726 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1727 } 1728 1729 /* 1730 * bridge_enqueue: 1731 * 1732 * Enqueue a packet on a bridge member interface. 1733 * 1734 */ 1735 static void 1736 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1737 { 1738 int len, err = 0; 1739 short mflags; 1740 struct mbuf *m0; 1741 1742 len = m->m_pkthdr.len; 1743 mflags = m->m_flags; 1744 1745 /* We may be sending a fragment so traverse the mbuf */ 1746 for (; m; m = m0) { 1747 m0 = m->m_nextpkt; 1748 m->m_nextpkt = NULL; 1749 1750 /* 1751 * If underlying interface can not do VLAN tag insertion itself 1752 * then attach a packet tag that holds it. 1753 */ 1754 if ((m->m_flags & M_VLANTAG) && 1755 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1756 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1757 if (m == NULL) { 1758 if_printf(dst_ifp, 1759 "unable to prepend VLAN header\n"); 1760 dst_ifp->if_oerrors++; 1761 continue; 1762 } 1763 m->m_flags &= ~M_VLANTAG; 1764 } 1765 1766 if (err == 0) 1767 dst_ifp->if_transmit(dst_ifp, m); 1768 } 1769 1770 if (err == 0) { 1771 sc->sc_ifp->if_opackets++; 1772 sc->sc_ifp->if_obytes += len; 1773 if (mflags & M_MCAST) 1774 sc->sc_ifp->if_omcasts++; 1775 } 1776 } 1777 1778 /* 1779 * bridge_dummynet: 1780 * 1781 * Receive a queued packet from dummynet and pass it on to the output 1782 * interface. 1783 * 1784 * The mbuf has the Ethernet header already attached. 1785 */ 1786 static void 1787 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1788 { 1789 struct bridge_softc *sc; 1790 1791 sc = ifp->if_bridge; 1792 1793 /* 1794 * The packet didnt originate from a member interface. This should only 1795 * ever happen if a member interface is removed while packets are 1796 * queued for it. 1797 */ 1798 if (sc == NULL) { 1799 m_freem(m); 1800 return; 1801 } 1802 1803 if (PFIL_HOOKED(&inet_pfil_hook) 1804 #ifdef INET6 1805 || PFIL_HOOKED(&inet6_pfil_hook) 1806 #endif 1807 ) { 1808 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1809 return; 1810 if (m == NULL) 1811 return; 1812 } 1813 1814 bridge_enqueue(sc, ifp, m); 1815 } 1816 1817 /* 1818 * bridge_output: 1819 * 1820 * Send output from a bridge member interface. This 1821 * performs the bridging function for locally originated 1822 * packets. 1823 * 1824 * The mbuf has the Ethernet header already attached. We must 1825 * enqueue or free the mbuf before returning. 1826 */ 1827 static int 1828 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1829 struct rtentry *rt) 1830 { 1831 struct ether_header *eh; 1832 struct ifnet *dst_if; 1833 struct bridge_softc *sc; 1834 uint16_t vlan; 1835 1836 if (m->m_len < ETHER_HDR_LEN) { 1837 m = m_pullup(m, ETHER_HDR_LEN); 1838 if (m == NULL) 1839 return (0); 1840 } 1841 1842 eh = mtod(m, struct ether_header *); 1843 sc = ifp->if_bridge; 1844 vlan = VLANTAGOF(m); 1845 1846 BRIDGE_LOCK(sc); 1847 1848 /* 1849 * If bridge is down, but the original output interface is up, 1850 * go ahead and send out that interface. Otherwise, the packet 1851 * is dropped below. 1852 */ 1853 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1854 dst_if = ifp; 1855 goto sendunicast; 1856 } 1857 1858 /* 1859 * If the packet is a multicast, or we don't know a better way to 1860 * get there, send to all interfaces. 1861 */ 1862 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1863 dst_if = NULL; 1864 else 1865 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1866 if (dst_if == NULL) { 1867 struct bridge_iflist *bif; 1868 struct mbuf *mc; 1869 int error = 0, used = 0; 1870 1871 bridge_span(sc, m); 1872 1873 BRIDGE_LOCK2REF(sc, error); 1874 if (error) { 1875 m_freem(m); 1876 return (0); 1877 } 1878 1879 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1880 dst_if = bif->bif_ifp; 1881 1882 if (dst_if->if_type == IFT_GIF) 1883 continue; 1884 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1885 continue; 1886 1887 /* 1888 * If this is not the original output interface, 1889 * and the interface is participating in spanning 1890 * tree, make sure the port is in a state that 1891 * allows forwarding. 1892 */ 1893 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1894 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1895 continue; 1896 1897 if (LIST_NEXT(bif, bif_next) == NULL) { 1898 used = 1; 1899 mc = m; 1900 } else { 1901 mc = m_copypacket(m, M_DONTWAIT); 1902 if (mc == NULL) { 1903 sc->sc_ifp->if_oerrors++; 1904 continue; 1905 } 1906 } 1907 1908 bridge_enqueue(sc, dst_if, mc); 1909 } 1910 if (used == 0) 1911 m_freem(m); 1912 BRIDGE_UNREF(sc); 1913 return (0); 1914 } 1915 1916 sendunicast: 1917 /* 1918 * XXX Spanning tree consideration here? 1919 */ 1920 1921 bridge_span(sc, m); 1922 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1923 m_freem(m); 1924 BRIDGE_UNLOCK(sc); 1925 return (0); 1926 } 1927 1928 BRIDGE_UNLOCK(sc); 1929 bridge_enqueue(sc, dst_if, m); 1930 return (0); 1931 } 1932 1933 /* 1934 * bridge_start: 1935 * 1936 * Start output on a bridge. 1937 * 1938 */ 1939 static void 1940 bridge_start(struct ifnet *ifp) 1941 { 1942 struct bridge_softc *sc; 1943 struct mbuf *m; 1944 struct ether_header *eh; 1945 struct ifnet *dst_if; 1946 1947 sc = ifp->if_softc; 1948 1949 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1950 for (;;) { 1951 IFQ_DEQUEUE(&ifp->if_snd, m); 1952 if (m == 0) 1953 break; 1954 ETHER_BPF_MTAP(ifp, m); 1955 1956 eh = mtod(m, struct ether_header *); 1957 dst_if = NULL; 1958 1959 BRIDGE_LOCK(sc); 1960 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1961 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1962 } 1963 1964 if (dst_if == NULL) 1965 bridge_broadcast(sc, ifp, m, 0); 1966 else { 1967 BRIDGE_UNLOCK(sc); 1968 bridge_enqueue(sc, dst_if, m); 1969 } 1970 } 1971 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1972 } 1973 1974 /* 1975 * bridge_forward: 1976 * 1977 * The forwarding function of the bridge. 1978 * 1979 * NOTE: Releases the lock on return. 1980 */ 1981 static void 1982 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1983 struct mbuf *m) 1984 { 1985 struct bridge_iflist *dbif; 1986 struct ifnet *src_if, *dst_if, *ifp; 1987 struct ether_header *eh; 1988 uint16_t vlan; 1989 uint8_t *dst; 1990 int error; 1991 1992 src_if = m->m_pkthdr.rcvif; 1993 ifp = sc->sc_ifp; 1994 1995 ifp->if_ipackets++; 1996 ifp->if_ibytes += m->m_pkthdr.len; 1997 vlan = VLANTAGOF(m); 1998 1999 if ((sbif->bif_flags & IFBIF_STP) && 2000 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2001 goto drop; 2002 2003 eh = mtod(m, struct ether_header *); 2004 dst = eh->ether_dhost; 2005 2006 /* If the interface is learning, record the address. */ 2007 if (sbif->bif_flags & IFBIF_LEARNING) { 2008 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2009 sbif, 0, IFBAF_DYNAMIC); 2010 /* 2011 * If the interface has addresses limits then deny any source 2012 * that is not in the cache. 2013 */ 2014 if (error && sbif->bif_addrmax) 2015 goto drop; 2016 } 2017 2018 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2019 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2020 goto drop; 2021 2022 /* 2023 * At this point, the port either doesn't participate 2024 * in spanning tree or it is in the forwarding state. 2025 */ 2026 2027 /* 2028 * If the packet is unicast, destined for someone on 2029 * "this" side of the bridge, drop it. 2030 */ 2031 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2032 dst_if = bridge_rtlookup(sc, dst, vlan); 2033 if (src_if == dst_if) 2034 goto drop; 2035 } else { 2036 /* 2037 * Check if its a reserved multicast address, any address 2038 * listed in 802.1D section 7.12.6 may not be forwarded by the 2039 * bridge. 2040 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2041 */ 2042 if (dst[0] == 0x01 && dst[1] == 0x80 && 2043 dst[2] == 0xc2 && dst[3] == 0x00 && 2044 dst[4] == 0x00 && dst[5] <= 0x0f) 2045 goto drop; 2046 2047 /* ...forward it to all interfaces. */ 2048 ifp->if_imcasts++; 2049 dst_if = NULL; 2050 } 2051 2052 /* 2053 * If we have a destination interface which is a member of our bridge, 2054 * OR this is a unicast packet, push it through the bpf(4) machinery. 2055 * For broadcast or multicast packets, don't bother because it will 2056 * be reinjected into ether_input. We do this before we pass the packets 2057 * through the pfil(9) framework, as it is possible that pfil(9) will 2058 * drop the packet, or possibly modify it, making it difficult to debug 2059 * firewall issues on the bridge. 2060 */ 2061 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2062 ETHER_BPF_MTAP(ifp, m); 2063 2064 /* run the packet filter */ 2065 if (PFIL_HOOKED(&inet_pfil_hook) 2066 #ifdef INET6 2067 || PFIL_HOOKED(&inet6_pfil_hook) 2068 #endif 2069 ) { 2070 BRIDGE_UNLOCK(sc); 2071 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2072 return; 2073 if (m == NULL) 2074 return; 2075 BRIDGE_LOCK(sc); 2076 } 2077 2078 if (dst_if == NULL) { 2079 bridge_broadcast(sc, src_if, m, 1); 2080 return; 2081 } 2082 2083 /* 2084 * At this point, we're dealing with a unicast frame 2085 * going to a different interface. 2086 */ 2087 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2088 goto drop; 2089 2090 dbif = bridge_lookup_member_if(sc, dst_if); 2091 if (dbif == NULL) 2092 /* Not a member of the bridge (anymore?) */ 2093 goto drop; 2094 2095 /* Private segments can not talk to each other */ 2096 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2097 goto drop; 2098 2099 if ((dbif->bif_flags & IFBIF_STP) && 2100 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2101 goto drop; 2102 2103 BRIDGE_UNLOCK(sc); 2104 2105 if (PFIL_HOOKED(&inet_pfil_hook) 2106 #ifdef INET6 2107 || PFIL_HOOKED(&inet6_pfil_hook) 2108 #endif 2109 ) { 2110 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2111 return; 2112 if (m == NULL) 2113 return; 2114 } 2115 2116 bridge_enqueue(sc, dst_if, m); 2117 return; 2118 2119 drop: 2120 BRIDGE_UNLOCK(sc); 2121 m_freem(m); 2122 } 2123 2124 /* 2125 * bridge_input: 2126 * 2127 * Receive input from a member interface. Queue the packet for 2128 * bridging if it is not for us. 2129 */ 2130 static struct mbuf * 2131 bridge_input(struct ifnet *ifp, struct mbuf *m) 2132 { 2133 struct bridge_softc *sc = ifp->if_bridge; 2134 struct bridge_iflist *bif, *bif2; 2135 struct ifnet *bifp; 2136 struct ether_header *eh; 2137 struct mbuf *mc, *mc2; 2138 uint16_t vlan; 2139 int error; 2140 2141 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2142 return (m); 2143 2144 bifp = sc->sc_ifp; 2145 vlan = VLANTAGOF(m); 2146 2147 /* 2148 * Implement support for bridge monitoring. If this flag has been 2149 * set on this interface, discard the packet once we push it through 2150 * the bpf(4) machinery, but before we do, increment the byte and 2151 * packet counters associated with this interface. 2152 */ 2153 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2154 m->m_pkthdr.rcvif = bifp; 2155 ETHER_BPF_MTAP(bifp, m); 2156 bifp->if_ipackets++; 2157 bifp->if_ibytes += m->m_pkthdr.len; 2158 m_freem(m); 2159 return (NULL); 2160 } 2161 BRIDGE_LOCK(sc); 2162 bif = bridge_lookup_member_if(sc, ifp); 2163 if (bif == NULL) { 2164 BRIDGE_UNLOCK(sc); 2165 return (m); 2166 } 2167 2168 eh = mtod(m, struct ether_header *); 2169 2170 bridge_span(sc, m); 2171 2172 if (m->m_flags & (M_BCAST|M_MCAST)) { 2173 /* Tap off 802.1D packets; they do not get forwarded. */ 2174 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2175 ETHER_ADDR_LEN) == 0) { 2176 m = bstp_input(&bif->bif_stp, ifp, m); 2177 if (m == NULL) { 2178 BRIDGE_UNLOCK(sc); 2179 return (NULL); 2180 } 2181 } 2182 2183 if ((bif->bif_flags & IFBIF_STP) && 2184 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2185 BRIDGE_UNLOCK(sc); 2186 return (m); 2187 } 2188 2189 /* 2190 * Make a deep copy of the packet and enqueue the copy 2191 * for bridge processing; return the original packet for 2192 * local processing. 2193 */ 2194 mc = m_dup(m, M_DONTWAIT); 2195 if (mc == NULL) { 2196 BRIDGE_UNLOCK(sc); 2197 return (m); 2198 } 2199 2200 /* Perform the bridge forwarding function with the copy. */ 2201 bridge_forward(sc, bif, mc); 2202 2203 /* 2204 * Reinject the mbuf as arriving on the bridge so we have a 2205 * chance at claiming multicast packets. We can not loop back 2206 * here from ether_input as a bridge is never a member of a 2207 * bridge. 2208 */ 2209 KASSERT(bifp->if_bridge == NULL, 2210 ("loop created in bridge_input")); 2211 mc2 = m_dup(m, M_DONTWAIT); 2212 if (mc2 != NULL) { 2213 /* Keep the layer3 header aligned */ 2214 int i = min(mc2->m_pkthdr.len, max_protohdr); 2215 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2216 } 2217 if (mc2 != NULL) { 2218 mc2->m_pkthdr.rcvif = bifp; 2219 (*bifp->if_input)(bifp, mc2); 2220 } 2221 2222 /* Return the original packet for local processing. */ 2223 return (m); 2224 } 2225 2226 if ((bif->bif_flags & IFBIF_STP) && 2227 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2228 BRIDGE_UNLOCK(sc); 2229 return (m); 2230 } 2231 2232 #if (defined(INET) || defined(INET6)) && defined(DEV_CARP) 2233 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2234 || ((iface)->if_carp \ 2235 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2236 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2237 || ((iface)->if_carp \ 2238 && carp_forus((iface)->if_carp, eh->ether_shost)) 2239 #else 2240 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2241 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2242 #endif 2243 2244 #ifdef INET6 2245 # define OR_PFIL_HOOKED_INET6 \ 2246 || PFIL_HOOKED(&inet6_pfil_hook) 2247 #else 2248 # define OR_PFIL_HOOKED_INET6 2249 #endif 2250 2251 #define GRAB_OUR_PACKETS(iface) \ 2252 if ((iface)->if_type == IFT_GIF) \ 2253 continue; \ 2254 /* It is destined for us. */ \ 2255 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2256 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2257 ) { \ 2258 if ((iface)->if_type == IFT_BRIDGE) { \ 2259 ETHER_BPF_MTAP(iface, m); \ 2260 iface->if_ipackets++; \ 2261 /* Filter on the physical interface. */ \ 2262 if (pfil_local_phys && \ 2263 (PFIL_HOOKED(&inet_pfil_hook) \ 2264 OR_PFIL_HOOKED_INET6)) { \ 2265 if (bridge_pfil(&m, NULL, ifp, \ 2266 PFIL_IN) != 0 || m == NULL) { \ 2267 BRIDGE_UNLOCK(sc); \ 2268 return (NULL); \ 2269 } \ 2270 } \ 2271 } \ 2272 if (bif->bif_flags & IFBIF_LEARNING) { \ 2273 error = bridge_rtupdate(sc, eh->ether_shost, \ 2274 vlan, bif, 0, IFBAF_DYNAMIC); \ 2275 if (error && bif->bif_addrmax) { \ 2276 BRIDGE_UNLOCK(sc); \ 2277 m_freem(m); \ 2278 return (NULL); \ 2279 } \ 2280 } \ 2281 m->m_pkthdr.rcvif = iface; \ 2282 BRIDGE_UNLOCK(sc); \ 2283 return (m); \ 2284 } \ 2285 \ 2286 /* We just received a packet that we sent out. */ \ 2287 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2288 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2289 ) { \ 2290 BRIDGE_UNLOCK(sc); \ 2291 m_freem(m); \ 2292 return (NULL); \ 2293 } 2294 2295 /* 2296 * Unicast. Make sure it's not for the bridge. 2297 */ 2298 do { GRAB_OUR_PACKETS(bifp) } while (0); 2299 2300 /* 2301 * Give a chance for ifp at first priority. This will help when the 2302 * packet comes through the interface like VLAN's with the same MACs 2303 * on several interfaces from the same bridge. This also will save 2304 * some CPU cycles in case the destination interface and the input 2305 * interface (eq ifp) are the same. 2306 */ 2307 do { GRAB_OUR_PACKETS(ifp) } while (0); 2308 2309 /* Now check the all bridge members. */ 2310 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2311 GRAB_OUR_PACKETS(bif2->bif_ifp) 2312 } 2313 2314 #undef OR_CARP_CHECK_WE_ARE_DST 2315 #undef OR_CARP_CHECK_WE_ARE_SRC 2316 #undef OR_PFIL_HOOKED_INET6 2317 #undef GRAB_OUR_PACKETS 2318 2319 /* Perform the bridge forwarding function. */ 2320 bridge_forward(sc, bif, m); 2321 2322 return (NULL); 2323 } 2324 2325 /* 2326 * bridge_broadcast: 2327 * 2328 * Send a frame to all interfaces that are members of 2329 * the bridge, except for the one on which the packet 2330 * arrived. 2331 * 2332 * NOTE: Releases the lock on return. 2333 */ 2334 static void 2335 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2336 struct mbuf *m, int runfilt) 2337 { 2338 struct bridge_iflist *dbif, *sbif; 2339 struct mbuf *mc; 2340 struct ifnet *dst_if; 2341 int error = 0, used = 0, i; 2342 2343 sbif = bridge_lookup_member_if(sc, src_if); 2344 2345 BRIDGE_LOCK2REF(sc, error); 2346 if (error) { 2347 m_freem(m); 2348 return; 2349 } 2350 2351 /* Filter on the bridge interface before broadcasting */ 2352 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2353 #ifdef INET6 2354 || PFIL_HOOKED(&inet6_pfil_hook) 2355 #endif 2356 )) { 2357 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2358 goto out; 2359 if (m == NULL) 2360 goto out; 2361 } 2362 2363 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2364 dst_if = dbif->bif_ifp; 2365 if (dst_if == src_if) 2366 continue; 2367 2368 /* Private segments can not talk to each other */ 2369 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2370 continue; 2371 2372 if ((dbif->bif_flags & IFBIF_STP) && 2373 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2374 continue; 2375 2376 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2377 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2378 continue; 2379 2380 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2381 continue; 2382 2383 if (LIST_NEXT(dbif, bif_next) == NULL) { 2384 mc = m; 2385 used = 1; 2386 } else { 2387 mc = m_dup(m, M_DONTWAIT); 2388 if (mc == NULL) { 2389 sc->sc_ifp->if_oerrors++; 2390 continue; 2391 } 2392 } 2393 2394 /* 2395 * Filter on the output interface. Pass a NULL bridge interface 2396 * pointer so we do not redundantly filter on the bridge for 2397 * each interface we broadcast on. 2398 */ 2399 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2400 #ifdef INET6 2401 || PFIL_HOOKED(&inet6_pfil_hook) 2402 #endif 2403 )) { 2404 if (used == 0) { 2405 /* Keep the layer3 header aligned */ 2406 i = min(mc->m_pkthdr.len, max_protohdr); 2407 mc = m_copyup(mc, i, ETHER_ALIGN); 2408 if (mc == NULL) { 2409 sc->sc_ifp->if_oerrors++; 2410 continue; 2411 } 2412 } 2413 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2414 continue; 2415 if (mc == NULL) 2416 continue; 2417 } 2418 2419 bridge_enqueue(sc, dst_if, mc); 2420 } 2421 if (used == 0) 2422 m_freem(m); 2423 2424 out: 2425 BRIDGE_UNREF(sc); 2426 } 2427 2428 /* 2429 * bridge_span: 2430 * 2431 * Duplicate a packet out one or more interfaces that are in span mode, 2432 * the original mbuf is unmodified. 2433 */ 2434 static void 2435 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2436 { 2437 struct bridge_iflist *bif; 2438 struct ifnet *dst_if; 2439 struct mbuf *mc; 2440 2441 if (LIST_EMPTY(&sc->sc_spanlist)) 2442 return; 2443 2444 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2445 dst_if = bif->bif_ifp; 2446 2447 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2448 continue; 2449 2450 mc = m_copypacket(m, M_DONTWAIT); 2451 if (mc == NULL) { 2452 sc->sc_ifp->if_oerrors++; 2453 continue; 2454 } 2455 2456 bridge_enqueue(sc, dst_if, mc); 2457 } 2458 } 2459 2460 /* 2461 * bridge_rtupdate: 2462 * 2463 * Add a bridge routing entry. 2464 */ 2465 static int 2466 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2467 struct bridge_iflist *bif, int setflags, uint8_t flags) 2468 { 2469 struct bridge_rtnode *brt; 2470 int error; 2471 2472 BRIDGE_LOCK_ASSERT(sc); 2473 2474 /* Check the source address is valid and not multicast. */ 2475 if (ETHER_IS_MULTICAST(dst) || 2476 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2477 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2478 return (EINVAL); 2479 2480 /* 802.1p frames map to vlan 1 */ 2481 if (vlan == 0) 2482 vlan = 1; 2483 2484 /* 2485 * A route for this destination might already exist. If so, 2486 * update it, otherwise create a new one. 2487 */ 2488 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2489 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2490 sc->sc_brtexceeded++; 2491 return (ENOSPC); 2492 } 2493 /* Check per interface address limits (if enabled) */ 2494 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2495 bif->bif_addrexceeded++; 2496 return (ENOSPC); 2497 } 2498 2499 /* 2500 * Allocate a new bridge forwarding node, and 2501 * initialize the expiration time and Ethernet 2502 * address. 2503 */ 2504 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2505 if (brt == NULL) 2506 return (ENOMEM); 2507 2508 if (bif->bif_flags & IFBIF_STICKY) 2509 brt->brt_flags = IFBAF_STICKY; 2510 else 2511 brt->brt_flags = IFBAF_DYNAMIC; 2512 2513 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2514 brt->brt_vlan = vlan; 2515 2516 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2517 uma_zfree(bridge_rtnode_zone, brt); 2518 return (error); 2519 } 2520 brt->brt_dst = bif; 2521 bif->bif_addrcnt++; 2522 } 2523 2524 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2525 brt->brt_dst != bif) { 2526 brt->brt_dst->bif_addrcnt--; 2527 brt->brt_dst = bif; 2528 brt->brt_dst->bif_addrcnt++; 2529 } 2530 2531 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2532 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2533 if (setflags) 2534 brt->brt_flags = flags; 2535 2536 return (0); 2537 } 2538 2539 /* 2540 * bridge_rtlookup: 2541 * 2542 * Lookup the destination interface for an address. 2543 */ 2544 static struct ifnet * 2545 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2546 { 2547 struct bridge_rtnode *brt; 2548 2549 BRIDGE_LOCK_ASSERT(sc); 2550 2551 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2552 return (NULL); 2553 2554 return (brt->brt_ifp); 2555 } 2556 2557 /* 2558 * bridge_rttrim: 2559 * 2560 * Trim the routine table so that we have a number 2561 * of routing entries less than or equal to the 2562 * maximum number. 2563 */ 2564 static void 2565 bridge_rttrim(struct bridge_softc *sc) 2566 { 2567 struct bridge_rtnode *brt, *nbrt; 2568 2569 BRIDGE_LOCK_ASSERT(sc); 2570 2571 /* Make sure we actually need to do this. */ 2572 if (sc->sc_brtcnt <= sc->sc_brtmax) 2573 return; 2574 2575 /* Force an aging cycle; this might trim enough addresses. */ 2576 bridge_rtage(sc); 2577 if (sc->sc_brtcnt <= sc->sc_brtmax) 2578 return; 2579 2580 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2581 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2582 bridge_rtnode_destroy(sc, brt); 2583 if (sc->sc_brtcnt <= sc->sc_brtmax) 2584 return; 2585 } 2586 } 2587 } 2588 2589 /* 2590 * bridge_timer: 2591 * 2592 * Aging timer for the bridge. 2593 */ 2594 static void 2595 bridge_timer(void *arg) 2596 { 2597 struct bridge_softc *sc = arg; 2598 2599 BRIDGE_LOCK_ASSERT(sc); 2600 2601 bridge_rtage(sc); 2602 2603 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2604 callout_reset(&sc->sc_brcallout, 2605 bridge_rtable_prune_period * hz, bridge_timer, sc); 2606 } 2607 2608 /* 2609 * bridge_rtage: 2610 * 2611 * Perform an aging cycle. 2612 */ 2613 static void 2614 bridge_rtage(struct bridge_softc *sc) 2615 { 2616 struct bridge_rtnode *brt, *nbrt; 2617 2618 BRIDGE_LOCK_ASSERT(sc); 2619 2620 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2621 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2622 if (time_uptime >= brt->brt_expire) 2623 bridge_rtnode_destroy(sc, brt); 2624 } 2625 } 2626 } 2627 2628 /* 2629 * bridge_rtflush: 2630 * 2631 * Remove all dynamic addresses from the bridge. 2632 */ 2633 static void 2634 bridge_rtflush(struct bridge_softc *sc, int full) 2635 { 2636 struct bridge_rtnode *brt, *nbrt; 2637 2638 BRIDGE_LOCK_ASSERT(sc); 2639 2640 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2641 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2642 bridge_rtnode_destroy(sc, brt); 2643 } 2644 } 2645 2646 /* 2647 * bridge_rtdaddr: 2648 * 2649 * Remove an address from the table. 2650 */ 2651 static int 2652 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2653 { 2654 struct bridge_rtnode *brt; 2655 int found = 0; 2656 2657 BRIDGE_LOCK_ASSERT(sc); 2658 2659 /* 2660 * If vlan is zero then we want to delete for all vlans so the lookup 2661 * may return more than one. 2662 */ 2663 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2664 bridge_rtnode_destroy(sc, brt); 2665 found = 1; 2666 } 2667 2668 return (found ? 0 : ENOENT); 2669 } 2670 2671 /* 2672 * bridge_rtdelete: 2673 * 2674 * Delete routes to a speicifc member interface. 2675 */ 2676 static void 2677 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2678 { 2679 struct bridge_rtnode *brt, *nbrt; 2680 2681 BRIDGE_LOCK_ASSERT(sc); 2682 2683 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2684 if (brt->brt_ifp == ifp && (full || 2685 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2686 bridge_rtnode_destroy(sc, brt); 2687 } 2688 } 2689 2690 /* 2691 * bridge_rtable_init: 2692 * 2693 * Initialize the route table for this bridge. 2694 */ 2695 static int 2696 bridge_rtable_init(struct bridge_softc *sc) 2697 { 2698 int i; 2699 2700 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2701 M_DEVBUF, M_NOWAIT); 2702 if (sc->sc_rthash == NULL) 2703 return (ENOMEM); 2704 2705 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2706 LIST_INIT(&sc->sc_rthash[i]); 2707 2708 sc->sc_rthash_key = arc4random(); 2709 2710 LIST_INIT(&sc->sc_rtlist); 2711 2712 return (0); 2713 } 2714 2715 /* 2716 * bridge_rtable_fini: 2717 * 2718 * Deconstruct the route table for this bridge. 2719 */ 2720 static void 2721 bridge_rtable_fini(struct bridge_softc *sc) 2722 { 2723 2724 KASSERT(sc->sc_brtcnt == 0, 2725 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2726 free(sc->sc_rthash, M_DEVBUF); 2727 } 2728 2729 /* 2730 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2731 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2732 */ 2733 #define mix(a, b, c) \ 2734 do { \ 2735 a -= b; a -= c; a ^= (c >> 13); \ 2736 b -= c; b -= a; b ^= (a << 8); \ 2737 c -= a; c -= b; c ^= (b >> 13); \ 2738 a -= b; a -= c; a ^= (c >> 12); \ 2739 b -= c; b -= a; b ^= (a << 16); \ 2740 c -= a; c -= b; c ^= (b >> 5); \ 2741 a -= b; a -= c; a ^= (c >> 3); \ 2742 b -= c; b -= a; b ^= (a << 10); \ 2743 c -= a; c -= b; c ^= (b >> 15); \ 2744 } while (/*CONSTCOND*/0) 2745 2746 static __inline uint32_t 2747 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2748 { 2749 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2750 2751 b += addr[5] << 8; 2752 b += addr[4]; 2753 a += addr[3] << 24; 2754 a += addr[2] << 16; 2755 a += addr[1] << 8; 2756 a += addr[0]; 2757 2758 mix(a, b, c); 2759 2760 return (c & BRIDGE_RTHASH_MASK); 2761 } 2762 2763 #undef mix 2764 2765 static int 2766 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2767 { 2768 int i, d; 2769 2770 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2771 d = ((int)a[i]) - ((int)b[i]); 2772 } 2773 2774 return (d); 2775 } 2776 2777 /* 2778 * bridge_rtnode_lookup: 2779 * 2780 * Look up a bridge route node for the specified destination. Compare the 2781 * vlan id or if zero then just return the first match. 2782 */ 2783 static struct bridge_rtnode * 2784 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2785 { 2786 struct bridge_rtnode *brt; 2787 uint32_t hash; 2788 int dir; 2789 2790 BRIDGE_LOCK_ASSERT(sc); 2791 2792 hash = bridge_rthash(sc, addr); 2793 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2794 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2795 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2796 return (brt); 2797 if (dir > 0) 2798 return (NULL); 2799 } 2800 2801 return (NULL); 2802 } 2803 2804 /* 2805 * bridge_rtnode_insert: 2806 * 2807 * Insert the specified bridge node into the route table. We 2808 * assume the entry is not already in the table. 2809 */ 2810 static int 2811 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2812 { 2813 struct bridge_rtnode *lbrt; 2814 uint32_t hash; 2815 int dir; 2816 2817 BRIDGE_LOCK_ASSERT(sc); 2818 2819 hash = bridge_rthash(sc, brt->brt_addr); 2820 2821 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2822 if (lbrt == NULL) { 2823 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2824 goto out; 2825 } 2826 2827 do { 2828 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2829 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2830 return (EEXIST); 2831 if (dir > 0) { 2832 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2833 goto out; 2834 } 2835 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2836 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2837 goto out; 2838 } 2839 lbrt = LIST_NEXT(lbrt, brt_hash); 2840 } while (lbrt != NULL); 2841 2842 #ifdef DIAGNOSTIC 2843 panic("bridge_rtnode_insert: impossible"); 2844 #endif 2845 2846 out: 2847 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2848 sc->sc_brtcnt++; 2849 2850 return (0); 2851 } 2852 2853 /* 2854 * bridge_rtnode_destroy: 2855 * 2856 * Destroy a bridge rtnode. 2857 */ 2858 static void 2859 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2860 { 2861 BRIDGE_LOCK_ASSERT(sc); 2862 2863 LIST_REMOVE(brt, brt_hash); 2864 2865 LIST_REMOVE(brt, brt_list); 2866 sc->sc_brtcnt--; 2867 brt->brt_dst->bif_addrcnt--; 2868 uma_zfree(bridge_rtnode_zone, brt); 2869 } 2870 2871 /* 2872 * bridge_rtable_expire: 2873 * 2874 * Set the expiry time for all routes on an interface. 2875 */ 2876 static void 2877 bridge_rtable_expire(struct ifnet *ifp, int age) 2878 { 2879 struct bridge_softc *sc = ifp->if_bridge; 2880 struct bridge_rtnode *brt; 2881 2882 BRIDGE_LOCK(sc); 2883 2884 /* 2885 * If the age is zero then flush, otherwise set all the expiry times to 2886 * age for the interface 2887 */ 2888 if (age == 0) 2889 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2890 else { 2891 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2892 /* Cap the expiry time to 'age' */ 2893 if (brt->brt_ifp == ifp && 2894 brt->brt_expire > time_uptime + age && 2895 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2896 brt->brt_expire = time_uptime + age; 2897 } 2898 } 2899 BRIDGE_UNLOCK(sc); 2900 } 2901 2902 /* 2903 * bridge_state_change: 2904 * 2905 * Callback from the bridgestp code when a port changes states. 2906 */ 2907 static void 2908 bridge_state_change(struct ifnet *ifp, int state) 2909 { 2910 struct bridge_softc *sc = ifp->if_bridge; 2911 static const char *stpstates[] = { 2912 "disabled", 2913 "listening", 2914 "learning", 2915 "forwarding", 2916 "blocking", 2917 "discarding" 2918 }; 2919 2920 if (log_stp) 2921 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2922 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2923 } 2924 2925 /* 2926 * Send bridge packets through pfil if they are one of the types pfil can deal 2927 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2928 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2929 * that interface. 2930 */ 2931 static int 2932 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2933 { 2934 int snap, error, i, hlen; 2935 struct ether_header *eh1, eh2; 2936 struct ip_fw_args args; 2937 struct ip *ip; 2938 struct llc llc1; 2939 u_int16_t ether_type; 2940 2941 snap = 0; 2942 error = -1; /* Default error if not error == 0 */ 2943 2944 #if 0 2945 /* we may return with the IP fields swapped, ensure its not shared */ 2946 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2947 #endif 2948 2949 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2950 return (0); /* filtering is disabled */ 2951 2952 i = min((*mp)->m_pkthdr.len, max_protohdr); 2953 if ((*mp)->m_len < i) { 2954 *mp = m_pullup(*mp, i); 2955 if (*mp == NULL) { 2956 printf("%s: m_pullup failed\n", __func__); 2957 return (-1); 2958 } 2959 } 2960 2961 eh1 = mtod(*mp, struct ether_header *); 2962 ether_type = ntohs(eh1->ether_type); 2963 2964 /* 2965 * Check for SNAP/LLC. 2966 */ 2967 if (ether_type < ETHERMTU) { 2968 struct llc *llc2 = (struct llc *)(eh1 + 1); 2969 2970 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2971 llc2->llc_dsap == LLC_SNAP_LSAP && 2972 llc2->llc_ssap == LLC_SNAP_LSAP && 2973 llc2->llc_control == LLC_UI) { 2974 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2975 snap = 1; 2976 } 2977 } 2978 2979 /* 2980 * If we're trying to filter bridge traffic, don't look at anything 2981 * other than IP and ARP traffic. If the filter doesn't understand 2982 * IPv6, don't allow IPv6 through the bridge either. This is lame 2983 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2984 * but of course we don't have an AppleTalk filter to begin with. 2985 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2986 * ARP traffic.) 2987 */ 2988 switch (ether_type) { 2989 case ETHERTYPE_ARP: 2990 case ETHERTYPE_REVARP: 2991 if (pfil_ipfw_arp == 0) 2992 return (0); /* Automatically pass */ 2993 break; 2994 2995 case ETHERTYPE_IP: 2996 #ifdef INET6 2997 case ETHERTYPE_IPV6: 2998 #endif /* INET6 */ 2999 break; 3000 default: 3001 /* 3002 * Check to see if the user wants to pass non-ip 3003 * packets, these will not be checked by pfil(9) and 3004 * passed unconditionally so the default is to drop. 3005 */ 3006 if (pfil_onlyip) 3007 goto bad; 3008 } 3009 3010 /* Strip off the Ethernet header and keep a copy. */ 3011 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3012 m_adj(*mp, ETHER_HDR_LEN); 3013 3014 /* Strip off snap header, if present */ 3015 if (snap) { 3016 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3017 m_adj(*mp, sizeof(struct llc)); 3018 } 3019 3020 /* 3021 * Check the IP header for alignment and errors 3022 */ 3023 if (dir == PFIL_IN) { 3024 switch (ether_type) { 3025 case ETHERTYPE_IP: 3026 error = bridge_ip_checkbasic(mp); 3027 break; 3028 #ifdef INET6 3029 case ETHERTYPE_IPV6: 3030 error = bridge_ip6_checkbasic(mp); 3031 break; 3032 #endif /* INET6 */ 3033 default: 3034 error = 0; 3035 } 3036 if (error) 3037 goto bad; 3038 } 3039 3040 if (ip_fw_chk_ptr && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3041 struct dn_pkt_tag *dn_tag; 3042 3043 error = -1; 3044 dn_tag = ip_dn_claim_tag(*mp); 3045 if (dn_tag != NULL) { 3046 if (dn_tag->rule != NULL && V_fw_one_pass) 3047 /* packet already partially processed */ 3048 goto ipfwpass; 3049 args.rule = dn_tag->rule; /* matching rule to restart */ 3050 args.rule_id = dn_tag->rule_id; 3051 args.chain_id = dn_tag->chain_id; 3052 } else 3053 args.rule = NULL; 3054 3055 args.m = *mp; 3056 args.oif = ifp; 3057 args.next_hop = NULL; 3058 args.eh = &eh2; 3059 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3060 i = ip_fw_chk_ptr(&args); 3061 *mp = args.m; 3062 3063 if (*mp == NULL) 3064 return (error); 3065 3066 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) { 3067 3068 /* put the Ethernet header back on */ 3069 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3070 if (*mp == NULL) 3071 return (error); 3072 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3073 3074 /* 3075 * Pass the pkt to dummynet, which consumes it. The 3076 * packet will return to us via bridge_dummynet(). 3077 */ 3078 args.oif = ifp; 3079 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3080 return (error); 3081 } 3082 3083 if (i != IP_FW_PASS) /* drop */ 3084 goto bad; 3085 } 3086 3087 ipfwpass: 3088 error = 0; 3089 3090 /* 3091 * Run the packet through pfil 3092 */ 3093 switch (ether_type) { 3094 case ETHERTYPE_IP: 3095 /* 3096 * before calling the firewall, swap fields the same as 3097 * IP does. here we assume the header is contiguous 3098 */ 3099 ip = mtod(*mp, struct ip *); 3100 3101 ip->ip_len = ntohs(ip->ip_len); 3102 ip->ip_off = ntohs(ip->ip_off); 3103 3104 /* 3105 * Run pfil on the member interface and the bridge, both can 3106 * be skipped by clearing pfil_member or pfil_bridge. 3107 * 3108 * Keep the order: 3109 * in_if -> bridge_if -> out_if 3110 */ 3111 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3112 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3113 dir, NULL); 3114 3115 if (*mp == NULL || error != 0) /* filter may consume */ 3116 break; 3117 3118 if (pfil_member && ifp != NULL) 3119 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3120 dir, NULL); 3121 3122 if (*mp == NULL || error != 0) /* filter may consume */ 3123 break; 3124 3125 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3126 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3127 dir, NULL); 3128 3129 if (*mp == NULL || error != 0) /* filter may consume */ 3130 break; 3131 3132 /* check if we need to fragment the packet */ 3133 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3134 i = (*mp)->m_pkthdr.len; 3135 if (i > ifp->if_mtu) { 3136 error = bridge_fragment(ifp, *mp, &eh2, snap, 3137 &llc1); 3138 return (error); 3139 } 3140 } 3141 3142 /* Recalculate the ip checksum and restore byte ordering */ 3143 ip = mtod(*mp, struct ip *); 3144 hlen = ip->ip_hl << 2; 3145 if (hlen < sizeof(struct ip)) 3146 goto bad; 3147 if (hlen > (*mp)->m_len) { 3148 if ((*mp = m_pullup(*mp, hlen)) == 0) 3149 goto bad; 3150 ip = mtod(*mp, struct ip *); 3151 if (ip == NULL) 3152 goto bad; 3153 } 3154 ip->ip_len = htons(ip->ip_len); 3155 ip->ip_off = htons(ip->ip_off); 3156 ip->ip_sum = 0; 3157 if (hlen == sizeof(struct ip)) 3158 ip->ip_sum = in_cksum_hdr(ip); 3159 else 3160 ip->ip_sum = in_cksum(*mp, hlen); 3161 3162 break; 3163 #ifdef INET6 3164 case ETHERTYPE_IPV6: 3165 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3166 error = pfil_run_hooks(&inet6_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(&inet6_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(&inet6_pfil_hook, mp, bifp, 3181 dir, NULL); 3182 break; 3183 #endif 3184 default: 3185 error = 0; 3186 break; 3187 } 3188 3189 if (*mp == NULL) 3190 return (error); 3191 if (error != 0) 3192 goto bad; 3193 3194 error = -1; 3195 3196 /* 3197 * Finally, put everything back the way it was and return 3198 */ 3199 if (snap) { 3200 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3201 if (*mp == NULL) 3202 return (error); 3203 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3204 } 3205 3206 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3207 if (*mp == NULL) 3208 return (error); 3209 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3210 3211 return (0); 3212 3213 bad: 3214 m_freem(*mp); 3215 *mp = NULL; 3216 return (error); 3217 } 3218 3219 /* 3220 * Perform basic checks on header size since 3221 * pfil assumes ip_input has already processed 3222 * it for it. Cut-and-pasted from ip_input.c. 3223 * Given how simple the IPv6 version is, 3224 * does the IPv4 version really need to be 3225 * this complicated? 3226 * 3227 * XXX Should we update ipstat here, or not? 3228 * XXX Right now we update ipstat but not 3229 * XXX csum_counter. 3230 */ 3231 static int 3232 bridge_ip_checkbasic(struct mbuf **mp) 3233 { 3234 struct mbuf *m = *mp; 3235 struct ip *ip; 3236 int len, hlen; 3237 u_short sum; 3238 3239 if (*mp == NULL) 3240 return (-1); 3241 3242 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3243 if ((m = m_copyup(m, sizeof(struct ip), 3244 (max_linkhdr + 3) & ~3)) == NULL) { 3245 /* XXXJRT new stat, please */ 3246 KMOD_IPSTAT_INC(ips_toosmall); 3247 goto bad; 3248 } 3249 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3250 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3251 KMOD_IPSTAT_INC(ips_toosmall); 3252 goto bad; 3253 } 3254 } 3255 ip = mtod(m, struct ip *); 3256 if (ip == NULL) goto bad; 3257 3258 if (ip->ip_v != IPVERSION) { 3259 KMOD_IPSTAT_INC(ips_badvers); 3260 goto bad; 3261 } 3262 hlen = ip->ip_hl << 2; 3263 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3264 KMOD_IPSTAT_INC(ips_badhlen); 3265 goto bad; 3266 } 3267 if (hlen > m->m_len) { 3268 if ((m = m_pullup(m, hlen)) == 0) { 3269 KMOD_IPSTAT_INC(ips_badhlen); 3270 goto bad; 3271 } 3272 ip = mtod(m, struct ip *); 3273 if (ip == NULL) goto bad; 3274 } 3275 3276 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3277 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3278 } else { 3279 if (hlen == sizeof(struct ip)) { 3280 sum = in_cksum_hdr(ip); 3281 } else { 3282 sum = in_cksum(m, hlen); 3283 } 3284 } 3285 if (sum) { 3286 KMOD_IPSTAT_INC(ips_badsum); 3287 goto bad; 3288 } 3289 3290 /* Retrieve the packet length. */ 3291 len = ntohs(ip->ip_len); 3292 3293 /* 3294 * Check for additional length bogosity 3295 */ 3296 if (len < hlen) { 3297 KMOD_IPSTAT_INC(ips_badlen); 3298 goto bad; 3299 } 3300 3301 /* 3302 * Check that the amount of data in the buffers 3303 * is as at least much as the IP header would have us expect. 3304 * Drop packet if shorter than we expect. 3305 */ 3306 if (m->m_pkthdr.len < len) { 3307 KMOD_IPSTAT_INC(ips_tooshort); 3308 goto bad; 3309 } 3310 3311 /* Checks out, proceed */ 3312 *mp = m; 3313 return (0); 3314 3315 bad: 3316 *mp = m; 3317 return (-1); 3318 } 3319 3320 #ifdef INET6 3321 /* 3322 * Same as above, but for IPv6. 3323 * Cut-and-pasted from ip6_input.c. 3324 * XXX Should we update ip6stat, or not? 3325 */ 3326 static int 3327 bridge_ip6_checkbasic(struct mbuf **mp) 3328 { 3329 struct mbuf *m = *mp; 3330 struct ip6_hdr *ip6; 3331 3332 /* 3333 * If the IPv6 header is not aligned, slurp it up into a new 3334 * mbuf with space for link headers, in the event we forward 3335 * it. Otherwise, if it is aligned, make sure the entire base 3336 * IPv6 header is in the first mbuf of the chain. 3337 */ 3338 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3339 struct ifnet *inifp = m->m_pkthdr.rcvif; 3340 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3341 (max_linkhdr + 3) & ~3)) == NULL) { 3342 /* XXXJRT new stat, please */ 3343 V_ip6stat.ip6s_toosmall++; 3344 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3345 goto bad; 3346 } 3347 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3348 struct ifnet *inifp = m->m_pkthdr.rcvif; 3349 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3350 V_ip6stat.ip6s_toosmall++; 3351 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3352 goto bad; 3353 } 3354 } 3355 3356 ip6 = mtod(m, struct ip6_hdr *); 3357 3358 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3359 V_ip6stat.ip6s_badvers++; 3360 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3361 goto bad; 3362 } 3363 3364 /* Checks out, proceed */ 3365 *mp = m; 3366 return (0); 3367 3368 bad: 3369 *mp = m; 3370 return (-1); 3371 } 3372 #endif /* INET6 */ 3373 3374 /* 3375 * bridge_fragment: 3376 * 3377 * Return a fragmented mbuf chain. 3378 */ 3379 static int 3380 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3381 int snap, struct llc *llc) 3382 { 3383 struct mbuf *m0; 3384 struct ip *ip; 3385 int error = -1; 3386 3387 if (m->m_len < sizeof(struct ip) && 3388 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3389 goto out; 3390 ip = mtod(m, struct ip *); 3391 3392 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3393 CSUM_DELAY_IP); 3394 if (error) 3395 goto out; 3396 3397 /* walk the chain and re-add the Ethernet header */ 3398 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3399 if (error == 0) { 3400 if (snap) { 3401 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3402 if (m0 == NULL) { 3403 error = ENOBUFS; 3404 continue; 3405 } 3406 bcopy(llc, mtod(m0, caddr_t), 3407 sizeof(struct llc)); 3408 } 3409 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3410 if (m0 == NULL) { 3411 error = ENOBUFS; 3412 continue; 3413 } 3414 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3415 } else 3416 m_freem(m); 3417 } 3418 3419 if (error == 0) 3420 KMOD_IPSTAT_INC(ips_fragmented); 3421 3422 return (error); 3423 3424 out: 3425 if (m != NULL) 3426 m_freem(m); 3427 return (error); 3428 }
Cache object: cd68b840879a15a8943be386b16681e9
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