if_bridge.c revision 1.126
1 /* $NetBSD: if_bridge.c,v 1.126 2016/06/20 07:06:06 knakahara 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 (at) 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 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.126 2016/06/20 07:06:06 knakahara Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_net_mpsafe.h" 89 #endif /* _KERNEL_OPT */ 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> /* for softnet_lock */ 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 #include <sys/kauth.h> 102 #include <sys/cpu.h> 103 #include <sys/cprng.h> 104 #include <sys/mutex.h> 105 #include <sys/kmem.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_llc.h> 112 113 #include <net/if_ether.h> 114 #include <net/if_bridgevar.h> 115 116 #if defined(BRIDGE_IPF) 117 /* Used for bridge_ip[6]_checkbasic */ 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #include <netinet/ip_private.h> /* XXX */ 123 124 #include <netinet/ip6.h> 125 #include <netinet6/in6_var.h> 126 #include <netinet6/ip6_var.h> 127 #include <netinet6/ip6_private.h> /* XXX */ 128 #endif /* BRIDGE_IPF */ 129 130 /* 131 * Size of the route hash table. Must be a power of two. 132 */ 133 #ifndef BRIDGE_RTHASH_SIZE 134 #define BRIDGE_RTHASH_SIZE 1024 135 #endif 136 137 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 138 139 #include "carp.h" 140 #if NCARP > 0 141 #include <netinet/in.h> 142 #include <netinet/in_var.h> 143 #include <netinet/ip_carp.h> 144 #endif 145 146 #include "ioconf.h" 147 148 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 149 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 150 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 151 152 /* 153 * Maximum number of addresses to cache. 154 */ 155 #ifndef BRIDGE_RTABLE_MAX 156 #define BRIDGE_RTABLE_MAX 100 157 #endif 158 159 /* 160 * Spanning tree defaults. 161 */ 162 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 163 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 164 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 165 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 166 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 167 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 168 #define BSTP_DEFAULT_PATH_COST 55 169 170 /* 171 * Timeout (in seconds) for entries learned dynamically. 172 */ 173 #ifndef BRIDGE_RTABLE_TIMEOUT 174 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 175 #endif 176 177 /* 178 * Number of seconds between walks of the route list. 179 */ 180 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 181 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 182 #endif 183 184 #define BRIDGE_RT_LOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 185 mutex_enter((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 187 mutex_exit((_sc)->sc_rtlist_lock) 188 #define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \ 189 mutex_owned((_sc)->sc_rtlist_lock)) 190 191 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 192 if ((_sc)->sc_rtlist_psz != NULL) \ 193 pserialize_perform((_sc)->sc_rtlist_psz); 194 195 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 196 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 197 198 199 #ifdef NET_MPSAFE 200 #define DECLARE_LOCK_VARIABLE 201 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 202 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 203 #else 204 #define DECLARE_LOCK_VARIABLE int __s 205 #define ACQUIRE_GLOBAL_LOCKS() do { \ 206 KERNEL_LOCK(1, NULL); \ 207 mutex_enter(softnet_lock); \ 208 __s = splnet(); \ 209 } while (0) 210 #define RELEASE_GLOBAL_LOCKS() do { \ 211 splx(__s); \ 212 mutex_exit(softnet_lock); \ 213 KERNEL_UNLOCK_ONE(NULL); \ 214 } while (0) 215 #endif 216 217 struct psref_class *bridge_psref_class __read_mostly; 218 219 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 220 221 static struct pool bridge_rtnode_pool; 222 223 static int bridge_clone_create(struct if_clone *, int); 224 static int bridge_clone_destroy(struct ifnet *); 225 226 static int bridge_ioctl(struct ifnet *, u_long, void *); 227 static int bridge_init(struct ifnet *); 228 static void bridge_stop(struct ifnet *, int); 229 static void bridge_start(struct ifnet *); 230 231 static void bridge_input(struct ifnet *, struct mbuf *); 232 static void bridge_forward(struct bridge_softc *, struct mbuf *); 233 234 static void bridge_timer(void *); 235 236 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 237 struct mbuf *); 238 239 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 240 struct ifnet *, int, uint8_t); 241 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 242 static void bridge_rttrim(struct bridge_softc *); 243 static void bridge_rtage(struct bridge_softc *); 244 static void bridge_rtage_work(struct work *, void *); 245 static void bridge_rtflush(struct bridge_softc *, int); 246 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 247 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 248 249 static void bridge_rtable_init(struct bridge_softc *); 250 static void bridge_rtable_fini(struct bridge_softc *); 251 252 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 253 const uint8_t *); 254 static int bridge_rtnode_insert(struct bridge_softc *, 255 struct bridge_rtnode *); 256 static void bridge_rtnode_remove(struct bridge_softc *, 257 struct bridge_rtnode *); 258 static void bridge_rtnode_destroy(struct bridge_rtnode *); 259 260 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 261 const char *name, 262 struct psref *); 263 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 264 struct ifnet *ifp, 265 struct psref *); 266 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 267 struct psref *); 268 static void bridge_delete_member(struct bridge_softc *, 269 struct bridge_iflist *); 270 static void bridge_acquire_member(struct bridge_softc *sc, 271 struct bridge_iflist *, 272 struct psref *); 273 274 static int bridge_ioctl_add(struct bridge_softc *, void *); 275 static int bridge_ioctl_del(struct bridge_softc *, void *); 276 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 277 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 278 static int bridge_ioctl_scache(struct bridge_softc *, void *); 279 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 280 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 281 static int bridge_ioctl_rts(struct bridge_softc *, void *); 282 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 283 static int bridge_ioctl_sto(struct bridge_softc *, void *); 284 static int bridge_ioctl_gto(struct bridge_softc *, void *); 285 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 286 static int bridge_ioctl_flush(struct bridge_softc *, void *); 287 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 288 static int bridge_ioctl_spri(struct bridge_softc *, void *); 289 static int bridge_ioctl_ght(struct bridge_softc *, void *); 290 static int bridge_ioctl_sht(struct bridge_softc *, void *); 291 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 292 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 293 static int bridge_ioctl_gma(struct bridge_softc *, void *); 294 static int bridge_ioctl_sma(struct bridge_softc *, void *); 295 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 297 #if defined(BRIDGE_IPF) 298 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 299 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 300 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 301 static int bridge_ip_checkbasic(struct mbuf **mp); 302 # ifdef INET6 303 static int bridge_ip6_checkbasic(struct mbuf **mp); 304 # endif /* INET6 */ 305 #endif /* BRIDGE_IPF */ 306 307 struct bridge_control { 308 int (*bc_func)(struct bridge_softc *, void *); 309 int bc_argsize; 310 int bc_flags; 311 }; 312 313 #define BC_F_COPYIN 0x01 /* copy arguments in */ 314 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 315 #define BC_F_SUSER 0x04 /* do super-user check */ 316 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 317 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 318 319 static const struct bridge_control bridge_control_table[] = { 320 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 321 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 322 323 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 324 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 325 326 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 327 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 328 329 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 330 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 331 332 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 333 334 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 335 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 336 337 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 338 339 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 343 344 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 345 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 350 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 351 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 354 355 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 356 #if defined(BRIDGE_IPF) 357 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 358 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 359 #endif /* BRIDGE_IPF */ 360 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 361 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 362 }; 363 364 static const int bridge_control_table_size = __arraycount(bridge_control_table); 365 366 static struct if_clone bridge_cloner = 367 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 368 369 /* 370 * bridgeattach: 371 * 372 * Pseudo-device attach routine. 373 */ 374 void 375 bridgeattach(int n) 376 { 377 378 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 379 0, 0, 0, "brtpl", NULL, IPL_NET); 380 381 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 382 383 if_clone_attach(&bridge_cloner); 384 } 385 386 /* 387 * bridge_clone_create: 388 * 389 * Create a new bridge instance. 390 */ 391 static int 392 bridge_clone_create(struct if_clone *ifc, int unit) 393 { 394 struct bridge_softc *sc; 395 struct ifnet *ifp; 396 int error; 397 398 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 399 ifp = &sc->sc_if; 400 401 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 402 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 403 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 404 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 405 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 406 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 407 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 408 sc->sc_filter_flags = 0; 409 410 /* Initialize our routing table. */ 411 bridge_rtable_init(sc); 412 413 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 414 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 415 if (error) 416 panic("%s: workqueue_create %d\n", __func__, error); 417 418 callout_init(&sc->sc_brcallout, 0); 419 callout_init(&sc->sc_bstpcallout, 0); 420 421 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 422 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 423 sc->sc_iflist_psref.bip_psz = pserialize_create(); 424 425 if_initname(ifp, ifc->ifc_name, unit); 426 ifp->if_softc = sc; 427 ifp->if_extflags = IFEF_OUTPUT_MPSAFE; 428 ifp->if_mtu = ETHERMTU; 429 ifp->if_ioctl = bridge_ioctl; 430 ifp->if_output = bridge_output; 431 ifp->if_start = bridge_start; 432 ifp->if_stop = bridge_stop; 433 ifp->if_init = bridge_init; 434 ifp->if_type = IFT_BRIDGE; 435 ifp->if_addrlen = 0; 436 ifp->if_dlt = DLT_EN10MB; 437 ifp->if_hdrlen = ETHER_HDR_LEN; 438 439 if_initialize(ifp); 440 if_register(ifp); 441 442 if_alloc_sadl(ifp); 443 444 return (0); 445 } 446 447 /* 448 * bridge_clone_destroy: 449 * 450 * Destroy a bridge instance. 451 */ 452 static int 453 bridge_clone_destroy(struct ifnet *ifp) 454 { 455 struct bridge_softc *sc = ifp->if_softc; 456 struct bridge_iflist *bif; 457 int s; 458 459 s = splnet(); 460 461 bridge_stop(ifp, 1); 462 463 BRIDGE_LOCK(sc); 464 for (;;) { 465 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 466 bif_next); 467 if (bif == NULL) 468 break; 469 bridge_delete_member(sc, bif); 470 } 471 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 472 BRIDGE_UNLOCK(sc); 473 474 splx(s); 475 476 if_detach(ifp); 477 478 /* Tear down the routing table. */ 479 bridge_rtable_fini(sc); 480 481 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 482 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 483 484 workqueue_destroy(sc->sc_rtage_wq); 485 486 kmem_free(sc, sizeof(*sc)); 487 488 return (0); 489 } 490 491 /* 492 * bridge_ioctl: 493 * 494 * Handle a control request from the operator. 495 */ 496 static int 497 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 498 { 499 struct bridge_softc *sc = ifp->if_softc; 500 struct lwp *l = curlwp; /* XXX */ 501 union { 502 struct ifbreq ifbreq; 503 struct ifbifconf ifbifconf; 504 struct ifbareq ifbareq; 505 struct ifbaconf ifbaconf; 506 struct ifbrparam ifbrparam; 507 } args; 508 struct ifdrv *ifd = (struct ifdrv *) data; 509 const struct bridge_control *bc = NULL; /* XXXGCC */ 510 int s, error = 0; 511 512 /* Authorize command before calling splnet(). */ 513 switch (cmd) { 514 case SIOCGDRVSPEC: 515 case SIOCSDRVSPEC: 516 if (ifd->ifd_cmd >= bridge_control_table_size 517 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 518 error = EINVAL; 519 return error; 520 } 521 522 /* We only care about BC_F_SUSER at this point. */ 523 if ((bc->bc_flags & BC_F_SUSER) == 0) 524 break; 525 526 error = kauth_authorize_network(l->l_cred, 527 KAUTH_NETWORK_INTERFACE_BRIDGE, 528 cmd == SIOCGDRVSPEC ? 529 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 530 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 531 ifd, NULL, NULL); 532 if (error) 533 return (error); 534 535 break; 536 } 537 538 s = splnet(); 539 540 switch (cmd) { 541 case SIOCGDRVSPEC: 542 case SIOCSDRVSPEC: 543 KASSERT(bc != NULL); 544 if (cmd == SIOCGDRVSPEC && 545 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 546 error = EINVAL; 547 break; 548 } 549 else if (cmd == SIOCSDRVSPEC && 550 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 551 error = EINVAL; 552 break; 553 } 554 555 /* BC_F_SUSER is checked above, before splnet(). */ 556 557 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 558 && (ifd->ifd_len != bc->bc_argsize 559 || ifd->ifd_len > sizeof(args))) { 560 error = EINVAL; 561 break; 562 } 563 564 memset(&args, 0, sizeof(args)); 565 if (bc->bc_flags & BC_F_COPYIN) { 566 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 567 if (error) 568 break; 569 } else if (bc->bc_flags & BC_F_XLATEIN) { 570 args.ifbifconf.ifbic_len = ifd->ifd_len; 571 args.ifbifconf.ifbic_buf = ifd->ifd_data; 572 } 573 574 error = (*bc->bc_func)(sc, &args); 575 if (error) 576 break; 577 578 if (bc->bc_flags & BC_F_COPYOUT) { 579 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 580 } else if (bc->bc_flags & BC_F_XLATEOUT) { 581 ifd->ifd_len = args.ifbifconf.ifbic_len; 582 ifd->ifd_data = args.ifbifconf.ifbic_buf; 583 } 584 break; 585 586 case SIOCSIFFLAGS: 587 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 588 break; 589 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 590 case IFF_RUNNING: 591 /* 592 * If interface is marked down and it is running, 593 * then stop and disable it. 594 */ 595 (*ifp->if_stop)(ifp, 1); 596 break; 597 case IFF_UP: 598 /* 599 * If interface is marked up and it is stopped, then 600 * start it. 601 */ 602 error = (*ifp->if_init)(ifp); 603 break; 604 default: 605 break; 606 } 607 break; 608 609 case SIOCSIFMTU: 610 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 611 error = 0; 612 break; 613 614 default: 615 error = ifioctl_common(ifp, cmd, data); 616 break; 617 } 618 619 splx(s); 620 621 return (error); 622 } 623 624 /* 625 * bridge_lookup_member: 626 * 627 * Lookup a bridge member interface. 628 */ 629 static struct bridge_iflist * 630 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 631 { 632 struct bridge_iflist *bif; 633 struct ifnet *ifp; 634 int s; 635 636 BRIDGE_PSZ_RENTER(s); 637 638 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 639 ifp = bif->bif_ifp; 640 if (strcmp(ifp->if_xname, name) == 0) 641 break; 642 } 643 if (bif != NULL) 644 bridge_acquire_member(sc, bif, psref); 645 646 BRIDGE_PSZ_REXIT(s); 647 648 return bif; 649 } 650 651 /* 652 * bridge_lookup_member_if: 653 * 654 * Lookup a bridge member interface by ifnet*. 655 */ 656 static struct bridge_iflist * 657 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 658 struct psref *psref) 659 { 660 struct bridge_iflist *bif; 661 int s; 662 663 BRIDGE_PSZ_RENTER(s); 664 665 bif = member_ifp->if_bridgeif; 666 if (bif != NULL) { 667 psref_acquire(psref, &bif->bif_psref, 668 bridge_psref_class); 669 } 670 671 BRIDGE_PSZ_REXIT(s); 672 673 return bif; 674 } 675 676 static void 677 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 678 struct psref *psref) 679 { 680 681 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 682 } 683 684 /* 685 * bridge_release_member: 686 * 687 * Release the specified member interface. 688 */ 689 static void 690 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 691 struct psref *psref) 692 { 693 694 psref_release(psref, &bif->bif_psref, bridge_psref_class); 695 } 696 697 /* 698 * bridge_delete_member: 699 * 700 * Delete the specified member interface. 701 */ 702 static void 703 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 704 { 705 struct ifnet *ifs = bif->bif_ifp; 706 707 KASSERT(BRIDGE_LOCKED(sc)); 708 709 ifs->_if_input = ether_input; 710 ifs->if_bridge = NULL; 711 ifs->if_bridgeif = NULL; 712 713 PSLIST_WRITER_REMOVE(bif, bif_next); 714 BRIDGE_PSZ_PERFORM(sc); 715 BRIDGE_UNLOCK(sc); 716 717 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 718 719 PSLIST_ENTRY_DESTROY(bif, bif_next); 720 kmem_free(bif, sizeof(*bif)); 721 722 BRIDGE_LOCK(sc); 723 } 724 725 static int 726 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 727 { 728 struct ifbreq *req = arg; 729 struct bridge_iflist *bif = NULL; 730 struct ifnet *ifs; 731 int error = 0; 732 struct psref psref; 733 734 ifs = if_get(req->ifbr_ifsname, &psref); 735 if (ifs == NULL) 736 return (ENOENT); 737 738 if (sc->sc_if.if_mtu != ifs->if_mtu) { 739 error = EINVAL; 740 goto out; 741 } 742 743 if (ifs->if_bridge == sc) { 744 error = EEXIST; 745 goto out; 746 } 747 748 if (ifs->if_bridge != NULL) { 749 error = EBUSY; 750 goto out; 751 } 752 753 if (ifs->_if_input != ether_input) { 754 error = EINVAL; 755 goto out; 756 } 757 758 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 759 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 760 error = EINVAL; 761 goto out; 762 } 763 764 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 765 766 switch (ifs->if_type) { 767 case IFT_ETHER: 768 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 769 goto out; 770 /* 771 * Place the interface into promiscuous mode. 772 */ 773 error = ifpromisc(ifs, 1); 774 if (error) 775 goto out; 776 break; 777 default: 778 error = EINVAL; 779 goto out; 780 } 781 782 bif->bif_ifp = ifs; 783 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 784 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 785 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 786 PSLIST_ENTRY_INIT(bif, bif_next); 787 psref_target_init(&bif->bif_psref, bridge_psref_class); 788 789 BRIDGE_LOCK(sc); 790 791 ifs->if_bridge = sc; 792 ifs->if_bridgeif = bif; 793 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 794 ifs->_if_input = bridge_input; 795 796 BRIDGE_UNLOCK(sc); 797 798 if (sc->sc_if.if_flags & IFF_RUNNING) 799 bstp_initialization(sc); 800 else 801 bstp_stop(sc); 802 803 out: 804 if_put(ifs, &psref); 805 if (error) { 806 if (bif != NULL) 807 kmem_free(bif, sizeof(*bif)); 808 } 809 return (error); 810 } 811 812 static int 813 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 814 { 815 struct ifbreq *req = arg; 816 const char *name = req->ifbr_ifsname; 817 struct bridge_iflist *bif; 818 struct ifnet *ifs; 819 820 BRIDGE_LOCK(sc); 821 822 /* 823 * Don't use bridge_lookup_member. We want to get a member 824 * with bif_refs == 0. 825 */ 826 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 827 ifs = bif->bif_ifp; 828 if (strcmp(ifs->if_xname, name) == 0) 829 break; 830 } 831 832 if (bif == NULL) { 833 BRIDGE_UNLOCK(sc); 834 return ENOENT; 835 } 836 837 bridge_delete_member(sc, bif); 838 839 BRIDGE_UNLOCK(sc); 840 841 switch (ifs->if_type) { 842 case IFT_ETHER: 843 /* 844 * Take the interface out of promiscuous mode. 845 * Don't call it with holding a spin lock. 846 */ 847 (void) ifpromisc(ifs, 0); 848 (void) ether_disable_vlan_mtu(ifs); 849 break; 850 default: 851 #ifdef DIAGNOSTIC 852 panic("bridge_delete_member: impossible"); 853 #endif 854 break; 855 } 856 857 bridge_rtdelete(sc, ifs); 858 859 if (sc->sc_if.if_flags & IFF_RUNNING) 860 bstp_initialization(sc); 861 862 return 0; 863 } 864 865 static int 866 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 867 { 868 struct ifbreq *req = arg; 869 struct bridge_iflist *bif; 870 struct psref psref; 871 872 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 873 if (bif == NULL) 874 return (ENOENT); 875 876 req->ifbr_ifsflags = bif->bif_flags; 877 req->ifbr_state = bif->bif_state; 878 req->ifbr_priority = bif->bif_priority; 879 req->ifbr_path_cost = bif->bif_path_cost; 880 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 881 882 bridge_release_member(sc, bif, &psref); 883 884 return (0); 885 } 886 887 static int 888 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 889 { 890 struct ifbreq *req = arg; 891 struct bridge_iflist *bif; 892 struct psref psref; 893 894 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 895 if (bif == NULL) 896 return (ENOENT); 897 898 if (req->ifbr_ifsflags & IFBIF_STP) { 899 switch (bif->bif_ifp->if_type) { 900 case IFT_ETHER: 901 /* These can do spanning tree. */ 902 break; 903 904 default: 905 /* Nothing else can. */ 906 bridge_release_member(sc, bif, &psref); 907 return (EINVAL); 908 } 909 } 910 911 bif->bif_flags = req->ifbr_ifsflags; 912 913 bridge_release_member(sc, bif, &psref); 914 915 if (sc->sc_if.if_flags & IFF_RUNNING) 916 bstp_initialization(sc); 917 918 return (0); 919 } 920 921 static int 922 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 923 { 924 struct ifbrparam *param = arg; 925 926 sc->sc_brtmax = param->ifbrp_csize; 927 bridge_rttrim(sc); 928 929 return (0); 930 } 931 932 static int 933 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 934 { 935 struct ifbrparam *param = arg; 936 937 param->ifbrp_csize = sc->sc_brtmax; 938 939 return (0); 940 } 941 942 static int 943 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 944 { 945 struct ifbifconf *bifc = arg; 946 struct bridge_iflist *bif; 947 struct ifbreq *breqs; 948 int i, count, error = 0; 949 950 retry: 951 BRIDGE_LOCK(sc); 952 count = 0; 953 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 954 count++; 955 BRIDGE_UNLOCK(sc); 956 957 if (count == 0) { 958 bifc->ifbic_len = 0; 959 return 0; 960 } 961 962 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 963 /* Tell that a larger buffer is needed */ 964 bifc->ifbic_len = sizeof(*breqs) * count; 965 return 0; 966 } 967 968 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 969 970 BRIDGE_LOCK(sc); 971 972 i = 0; 973 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 974 i++; 975 if (i > count) { 976 /* 977 * The number of members has been increased. 978 * We need more memory! 979 */ 980 BRIDGE_UNLOCK(sc); 981 kmem_free(breqs, sizeof(*breqs) * count); 982 goto retry; 983 } 984 985 i = 0; 986 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 987 struct ifbreq *breq = &breqs[i++]; 988 memset(breq, 0, sizeof(*breq)); 989 990 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 991 sizeof(breq->ifbr_ifsname)); 992 breq->ifbr_ifsflags = bif->bif_flags; 993 breq->ifbr_state = bif->bif_state; 994 breq->ifbr_priority = bif->bif_priority; 995 breq->ifbr_path_cost = bif->bif_path_cost; 996 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 997 } 998 999 /* Don't call copyout with holding the mutex */ 1000 BRIDGE_UNLOCK(sc); 1001 1002 for (i = 0; i < count; i++) { 1003 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1004 if (error) 1005 break; 1006 } 1007 bifc->ifbic_len = sizeof(*breqs) * i; 1008 1009 kmem_free(breqs, sizeof(*breqs) * count); 1010 1011 return error; 1012 } 1013 1014 static int 1015 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1016 { 1017 struct ifbaconf *bac = arg; 1018 struct bridge_rtnode *brt; 1019 struct ifbareq bareq; 1020 int count = 0, error = 0, len; 1021 1022 if (bac->ifbac_len == 0) 1023 return (0); 1024 1025 BRIDGE_RT_LOCK(sc); 1026 1027 len = bac->ifbac_len; 1028 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1029 if (len < sizeof(bareq)) 1030 goto out; 1031 memset(&bareq, 0, sizeof(bareq)); 1032 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1033 sizeof(bareq.ifba_ifsname)); 1034 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1035 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1036 bareq.ifba_expire = brt->brt_expire - time_uptime; 1037 } else 1038 bareq.ifba_expire = 0; 1039 bareq.ifba_flags = brt->brt_flags; 1040 1041 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1042 if (error) 1043 goto out; 1044 count++; 1045 len -= sizeof(bareq); 1046 } 1047 out: 1048 BRIDGE_RT_UNLOCK(sc); 1049 1050 bac->ifbac_len = sizeof(bareq) * count; 1051 return (error); 1052 } 1053 1054 static int 1055 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1056 { 1057 struct ifbareq *req = arg; 1058 struct bridge_iflist *bif; 1059 int error; 1060 struct psref psref; 1061 1062 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1063 if (bif == NULL) 1064 return (ENOENT); 1065 1066 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1067 req->ifba_flags); 1068 1069 bridge_release_member(sc, bif, &psref); 1070 1071 return (error); 1072 } 1073 1074 static int 1075 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1076 { 1077 struct ifbrparam *param = arg; 1078 1079 sc->sc_brttimeout = param->ifbrp_ctime; 1080 1081 return (0); 1082 } 1083 1084 static int 1085 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1086 { 1087 struct ifbrparam *param = arg; 1088 1089 param->ifbrp_ctime = sc->sc_brttimeout; 1090 1091 return (0); 1092 } 1093 1094 static int 1095 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1096 { 1097 struct ifbareq *req = arg; 1098 1099 return (bridge_rtdaddr(sc, req->ifba_dst)); 1100 } 1101 1102 static int 1103 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1104 { 1105 struct ifbreq *req = arg; 1106 1107 bridge_rtflush(sc, req->ifbr_ifsflags); 1108 1109 return (0); 1110 } 1111 1112 static int 1113 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1114 { 1115 struct ifbrparam *param = arg; 1116 1117 param->ifbrp_prio = sc->sc_bridge_priority; 1118 1119 return (0); 1120 } 1121 1122 static int 1123 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1124 { 1125 struct ifbrparam *param = arg; 1126 1127 sc->sc_bridge_priority = param->ifbrp_prio; 1128 1129 if (sc->sc_if.if_flags & IFF_RUNNING) 1130 bstp_initialization(sc); 1131 1132 return (0); 1133 } 1134 1135 static int 1136 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1137 { 1138 struct ifbrparam *param = arg; 1139 1140 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1141 1142 return (0); 1143 } 1144 1145 static int 1146 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1147 { 1148 struct ifbrparam *param = arg; 1149 1150 if (param->ifbrp_hellotime == 0) 1151 return (EINVAL); 1152 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1153 1154 if (sc->sc_if.if_flags & IFF_RUNNING) 1155 bstp_initialization(sc); 1156 1157 return (0); 1158 } 1159 1160 static int 1161 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1162 { 1163 struct ifbrparam *param = arg; 1164 1165 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1166 1167 return (0); 1168 } 1169 1170 static int 1171 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1172 { 1173 struct ifbrparam *param = arg; 1174 1175 if (param->ifbrp_fwddelay == 0) 1176 return (EINVAL); 1177 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1178 1179 if (sc->sc_if.if_flags & IFF_RUNNING) 1180 bstp_initialization(sc); 1181 1182 return (0); 1183 } 1184 1185 static int 1186 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1187 { 1188 struct ifbrparam *param = arg; 1189 1190 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1191 1192 return (0); 1193 } 1194 1195 static int 1196 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1197 { 1198 struct ifbrparam *param = arg; 1199 1200 if (param->ifbrp_maxage == 0) 1201 return (EINVAL); 1202 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1203 1204 if (sc->sc_if.if_flags & IFF_RUNNING) 1205 bstp_initialization(sc); 1206 1207 return (0); 1208 } 1209 1210 static int 1211 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1212 { 1213 struct ifbreq *req = arg; 1214 struct bridge_iflist *bif; 1215 struct psref psref; 1216 1217 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1218 if (bif == NULL) 1219 return (ENOENT); 1220 1221 bif->bif_priority = req->ifbr_priority; 1222 1223 if (sc->sc_if.if_flags & IFF_RUNNING) 1224 bstp_initialization(sc); 1225 1226 bridge_release_member(sc, bif, &psref); 1227 1228 return (0); 1229 } 1230 1231 #if defined(BRIDGE_IPF) 1232 static int 1233 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1234 { 1235 struct ifbrparam *param = arg; 1236 1237 param->ifbrp_filter = sc->sc_filter_flags; 1238 1239 return (0); 1240 } 1241 1242 static int 1243 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1244 { 1245 struct ifbrparam *param = arg; 1246 uint32_t nflags, oflags; 1247 1248 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1249 return (EINVAL); 1250 1251 nflags = param->ifbrp_filter; 1252 oflags = sc->sc_filter_flags; 1253 1254 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1255 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1256 sc->sc_if.if_pfil); 1257 } 1258 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1259 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1260 sc->sc_if.if_pfil); 1261 } 1262 1263 sc->sc_filter_flags = nflags; 1264 1265 return (0); 1266 } 1267 #endif /* BRIDGE_IPF */ 1268 1269 static int 1270 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1271 { 1272 struct ifbreq *req = arg; 1273 struct bridge_iflist *bif; 1274 struct psref psref; 1275 1276 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1277 if (bif == NULL) 1278 return (ENOENT); 1279 1280 bif->bif_path_cost = req->ifbr_path_cost; 1281 1282 if (sc->sc_if.if_flags & IFF_RUNNING) 1283 bstp_initialization(sc); 1284 1285 bridge_release_member(sc, bif, &psref); 1286 1287 return (0); 1288 } 1289 1290 /* 1291 * bridge_ifdetach: 1292 * 1293 * Detach an interface from a bridge. Called when a member 1294 * interface is detaching. 1295 */ 1296 void 1297 bridge_ifdetach(struct ifnet *ifp) 1298 { 1299 struct bridge_softc *sc = ifp->if_bridge; 1300 struct ifbreq breq; 1301 1302 /* ioctl_lock should prevent this from happening */ 1303 KASSERT(sc != NULL); 1304 1305 memset(&breq, 0, sizeof(breq)); 1306 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1307 1308 (void) bridge_ioctl_del(sc, &breq); 1309 } 1310 1311 /* 1312 * bridge_init: 1313 * 1314 * Initialize a bridge interface. 1315 */ 1316 static int 1317 bridge_init(struct ifnet *ifp) 1318 { 1319 struct bridge_softc *sc = ifp->if_softc; 1320 1321 if (ifp->if_flags & IFF_RUNNING) 1322 return (0); 1323 1324 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1325 bridge_timer, sc); 1326 1327 ifp->if_flags |= IFF_RUNNING; 1328 bstp_initialization(sc); 1329 return (0); 1330 } 1331 1332 /* 1333 * bridge_stop: 1334 * 1335 * Stop the bridge interface. 1336 */ 1337 static void 1338 bridge_stop(struct ifnet *ifp, int disable) 1339 { 1340 struct bridge_softc *sc = ifp->if_softc; 1341 1342 if ((ifp->if_flags & IFF_RUNNING) == 0) 1343 return; 1344 1345 callout_stop(&sc->sc_brcallout); 1346 bstp_stop(sc); 1347 1348 bridge_rtflush(sc, IFBF_FLUSHDYN); 1349 1350 ifp->if_flags &= ~IFF_RUNNING; 1351 } 1352 1353 /* 1354 * bridge_enqueue: 1355 * 1356 * Enqueue a packet on a bridge member interface. 1357 */ 1358 void 1359 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1360 int runfilt) 1361 { 1362 int len, error; 1363 short mflags; 1364 1365 /* 1366 * Clear any in-bound checksum flags for this packet. 1367 */ 1368 m->m_pkthdr.csum_flags = 0; 1369 1370 if (runfilt) { 1371 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1372 dst_ifp, PFIL_OUT) != 0) { 1373 if (m != NULL) 1374 m_freem(m); 1375 return; 1376 } 1377 if (m == NULL) 1378 return; 1379 } 1380 1381 #ifdef ALTQ 1382 KERNEL_LOCK(1, NULL); 1383 /* 1384 * If ALTQ is enabled on the member interface, do 1385 * classification; the queueing discipline might 1386 * not require classification, but might require 1387 * the address family/header pointer in the pktattr. 1388 */ 1389 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1390 /* XXX IFT_ETHER */ 1391 altq_etherclassify(&dst_ifp->if_snd, m); 1392 } 1393 KERNEL_UNLOCK_ONE(NULL); 1394 #endif /* ALTQ */ 1395 1396 len = m->m_pkthdr.len; 1397 mflags = m->m_flags; 1398 1399 error = (*dst_ifp->if_transmit)(dst_ifp, m); 1400 if (error) { 1401 /* mbuf is already freed */ 1402 sc->sc_if.if_oerrors++; 1403 return; 1404 } 1405 1406 sc->sc_if.if_opackets++; 1407 sc->sc_if.if_obytes += len; 1408 if (mflags & M_MCAST) 1409 sc->sc_if.if_omcasts++; 1410 } 1411 1412 /* 1413 * bridge_output: 1414 * 1415 * Send output from a bridge member interface. This 1416 * performs the bridging function for locally originated 1417 * packets. 1418 * 1419 * The mbuf has the Ethernet header already attached. We must 1420 * enqueue or free the mbuf before returning. 1421 */ 1422 int 1423 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1424 const struct rtentry *rt) 1425 { 1426 struct ether_header *eh; 1427 struct ifnet *dst_if; 1428 struct bridge_softc *sc; 1429 int s; 1430 1431 KASSERT(ifp->if_extflags & IFEF_OUTPUT_MPSAFE); 1432 1433 if (m->m_len < ETHER_HDR_LEN) { 1434 m = m_pullup(m, ETHER_HDR_LEN); 1435 if (m == NULL) 1436 return (0); 1437 } 1438 1439 eh = mtod(m, struct ether_header *); 1440 sc = ifp->if_bridge; 1441 1442 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1443 if (memcmp(etherbroadcastaddr, 1444 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1445 m->m_flags |= M_BCAST; 1446 else 1447 m->m_flags |= M_MCAST; 1448 } 1449 1450 /* 1451 * If bridge is down, but the original output interface is up, 1452 * go ahead and send out that interface. Otherwise, the packet 1453 * is dropped below. 1454 */ 1455 if (__predict_false(sc == NULL) || 1456 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1457 dst_if = ifp; 1458 goto sendunicast; 1459 } 1460 1461 /* 1462 * If the packet is a multicast, or we don't know a better way to 1463 * get there, send to all interfaces. 1464 */ 1465 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1466 dst_if = NULL; 1467 else 1468 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1469 if (dst_if == NULL) { 1470 /* XXX Should call bridge_broadcast, but there are locking 1471 * issues which need resolving first. */ 1472 struct bridge_iflist *bif; 1473 struct mbuf *mc; 1474 bool used = false; 1475 1476 BRIDGE_PSZ_RENTER(s); 1477 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1478 struct psref psref; 1479 1480 bridge_acquire_member(sc, bif, &psref); 1481 BRIDGE_PSZ_REXIT(s); 1482 1483 dst_if = bif->bif_ifp; 1484 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1485 goto next; 1486 1487 /* 1488 * If this is not the original output interface, 1489 * and the interface is participating in spanning 1490 * tree, make sure the port is in a state that 1491 * allows forwarding. 1492 */ 1493 if (dst_if != ifp && 1494 (bif->bif_flags & IFBIF_STP) != 0) { 1495 switch (bif->bif_state) { 1496 case BSTP_IFSTATE_BLOCKING: 1497 case BSTP_IFSTATE_LISTENING: 1498 case BSTP_IFSTATE_DISABLED: 1499 goto next; 1500 } 1501 } 1502 1503 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1504 bif_next) == NULL && 1505 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1506 dst_if == ifp)) 1507 { 1508 used = true; 1509 mc = m; 1510 } else { 1511 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1512 if (mc == NULL) { 1513 sc->sc_if.if_oerrors++; 1514 goto next; 1515 } 1516 } 1517 1518 #ifndef NET_MPSAFE 1519 s = splnet(); 1520 #endif 1521 bridge_enqueue(sc, dst_if, mc, 0); 1522 #ifndef NET_MPSAFE 1523 splx(s); 1524 #endif 1525 1526 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1527 dst_if != ifp) 1528 { 1529 if (PSLIST_READER_NEXT(bif, 1530 struct bridge_iflist, bif_next) == NULL) 1531 { 1532 used = true; 1533 mc = m; 1534 } else { 1535 mc = m_copym(m, 0, M_COPYALL, 1536 M_DONTWAIT); 1537 if (mc == NULL) { 1538 sc->sc_if.if_oerrors++; 1539 goto next; 1540 } 1541 } 1542 1543 m_set_rcvif(mc, dst_if); 1544 mc->m_flags &= ~M_PROMISC; 1545 1546 #ifndef NET_MPSAFE 1547 s = splnet(); 1548 #endif 1549 ether_input(dst_if, mc); 1550 #ifndef NET_MPSAFE 1551 splx(s); 1552 #endif 1553 } 1554 1555 next: 1556 BRIDGE_PSZ_RENTER(s); 1557 bridge_release_member(sc, bif, &psref); 1558 1559 /* Guarantee we don't re-enter the loop as we already 1560 * decided we're at the end. */ 1561 if (used) 1562 break; 1563 } 1564 BRIDGE_PSZ_REXIT(s); 1565 1566 if (!used) 1567 m_freem(m); 1568 return (0); 1569 } 1570 1571 sendunicast: 1572 /* 1573 * XXX Spanning tree consideration here? 1574 */ 1575 1576 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1577 m_freem(m); 1578 return (0); 1579 } 1580 1581 #ifndef NET_MPSAFE 1582 s = splnet(); 1583 #endif 1584 bridge_enqueue(sc, dst_if, m, 0); 1585 #ifndef NET_MPSAFE 1586 splx(s); 1587 #endif 1588 1589 return (0); 1590 } 1591 1592 /* 1593 * bridge_start: 1594 * 1595 * Start output on a bridge. 1596 * 1597 * NOTE: This routine should never be called in this implementation. 1598 */ 1599 static void 1600 bridge_start(struct ifnet *ifp) 1601 { 1602 1603 printf("%s: bridge_start() called\n", ifp->if_xname); 1604 } 1605 1606 /* 1607 * bridge_forward: 1608 * 1609 * The forwarding function of the bridge. 1610 */ 1611 static void 1612 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1613 { 1614 struct bridge_iflist *bif; 1615 struct ifnet *src_if, *dst_if; 1616 struct ether_header *eh; 1617 struct psref psref; 1618 struct psref psref_src; 1619 DECLARE_LOCK_VARIABLE; 1620 1621 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1622 return; 1623 1624 src_if = m_get_rcvif_psref(m, &psref_src); 1625 if (src_if == NULL) { 1626 /* Interface is being destroyed? */ 1627 m_freem(m); 1628 goto out; 1629 } 1630 1631 sc->sc_if.if_ipackets++; 1632 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1633 1634 /* 1635 * Look up the bridge_iflist. 1636 */ 1637 bif = bridge_lookup_member_if(sc, src_if, &psref); 1638 if (bif == NULL) { 1639 /* Interface is not a bridge member (anymore?) */ 1640 m_freem(m); 1641 goto out; 1642 } 1643 1644 if (bif->bif_flags & IFBIF_STP) { 1645 switch (bif->bif_state) { 1646 case BSTP_IFSTATE_BLOCKING: 1647 case BSTP_IFSTATE_LISTENING: 1648 case BSTP_IFSTATE_DISABLED: 1649 m_freem(m); 1650 bridge_release_member(sc, bif, &psref); 1651 goto out; 1652 } 1653 } 1654 1655 eh = mtod(m, struct ether_header *); 1656 1657 /* 1658 * If the interface is learning, and the source 1659 * address is valid and not multicast, record 1660 * the address. 1661 */ 1662 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1663 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1664 (eh->ether_shost[0] == 0 && 1665 eh->ether_shost[1] == 0 && 1666 eh->ether_shost[2] == 0 && 1667 eh->ether_shost[3] == 0 && 1668 eh->ether_shost[4] == 0 && 1669 eh->ether_shost[5] == 0) == 0) { 1670 (void) bridge_rtupdate(sc, eh->ether_shost, 1671 src_if, 0, IFBAF_DYNAMIC); 1672 } 1673 1674 if ((bif->bif_flags & IFBIF_STP) != 0 && 1675 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1676 m_freem(m); 1677 bridge_release_member(sc, bif, &psref); 1678 goto out; 1679 } 1680 1681 bridge_release_member(sc, bif, &psref); 1682 1683 /* 1684 * At this point, the port either doesn't participate 1685 * in spanning tree or it is in the forwarding state. 1686 */ 1687 1688 /* 1689 * If the packet is unicast, destined for someone on 1690 * "this" side of the bridge, drop it. 1691 */ 1692 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1693 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1694 if (src_if == dst_if) { 1695 m_freem(m); 1696 goto out; 1697 } 1698 } else { 1699 /* ...forward it to all interfaces. */ 1700 sc->sc_if.if_imcasts++; 1701 dst_if = NULL; 1702 } 1703 1704 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1705 if (m != NULL) 1706 m_freem(m); 1707 goto out; 1708 } 1709 if (m == NULL) 1710 goto out; 1711 1712 if (dst_if == NULL) { 1713 bridge_broadcast(sc, src_if, m); 1714 goto out; 1715 } 1716 1717 m_put_rcvif_psref(src_if, &psref_src); 1718 src_if = NULL; 1719 1720 /* 1721 * At this point, we're dealing with a unicast frame 1722 * going to a different interface. 1723 */ 1724 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1725 m_freem(m); 1726 goto out; 1727 } 1728 1729 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1730 if (bif == NULL) { 1731 /* Not a member of the bridge (anymore?) */ 1732 m_freem(m); 1733 goto out; 1734 } 1735 1736 if (bif->bif_flags & IFBIF_STP) { 1737 switch (bif->bif_state) { 1738 case BSTP_IFSTATE_DISABLED: 1739 case BSTP_IFSTATE_BLOCKING: 1740 m_freem(m); 1741 bridge_release_member(sc, bif, &psref); 1742 goto out; 1743 } 1744 } 1745 1746 bridge_release_member(sc, bif, &psref); 1747 1748 ACQUIRE_GLOBAL_LOCKS(); 1749 bridge_enqueue(sc, dst_if, m, 1); 1750 RELEASE_GLOBAL_LOCKS(); 1751 out: 1752 if (src_if != NULL) 1753 m_put_rcvif_psref(src_if, &psref_src); 1754 return; 1755 } 1756 1757 static bool 1758 bstp_state_before_learning(struct bridge_iflist *bif) 1759 { 1760 if (bif->bif_flags & IFBIF_STP) { 1761 switch (bif->bif_state) { 1762 case BSTP_IFSTATE_BLOCKING: 1763 case BSTP_IFSTATE_LISTENING: 1764 case BSTP_IFSTATE_DISABLED: 1765 return true; 1766 } 1767 } 1768 return false; 1769 } 1770 1771 static bool 1772 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1773 { 1774 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1775 1776 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1777 #if NCARP > 0 1778 || (bif->bif_ifp->if_carp && 1779 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1780 #endif /* NCARP > 0 */ 1781 ) 1782 return true; 1783 1784 return false; 1785 } 1786 1787 /* 1788 * bridge_input: 1789 * 1790 * Receive input from a member interface. Queue the packet for 1791 * bridging if it is not for us. 1792 */ 1793 static void 1794 bridge_input(struct ifnet *ifp, struct mbuf *m) 1795 { 1796 struct bridge_softc *sc = ifp->if_bridge; 1797 struct bridge_iflist *bif; 1798 struct ether_header *eh; 1799 struct psref psref; 1800 DECLARE_LOCK_VARIABLE; 1801 1802 KASSERT(!cpu_intr_p()); 1803 1804 if (__predict_false(sc == NULL) || 1805 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1806 ACQUIRE_GLOBAL_LOCKS(); 1807 ether_input(ifp, m); 1808 RELEASE_GLOBAL_LOCKS(); 1809 return; 1810 } 1811 1812 bif = bridge_lookup_member_if(sc, ifp, &psref); 1813 if (bif == NULL) { 1814 ACQUIRE_GLOBAL_LOCKS(); 1815 ether_input(ifp, m); 1816 RELEASE_GLOBAL_LOCKS(); 1817 return; 1818 } 1819 1820 eh = mtod(m, struct ether_header *); 1821 1822 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1823 if (memcmp(etherbroadcastaddr, 1824 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1825 m->m_flags |= M_BCAST; 1826 else 1827 m->m_flags |= M_MCAST; 1828 } 1829 1830 /* 1831 * A 'fast' path for packets addressed to interfaces that are 1832 * part of this bridge. 1833 */ 1834 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1835 !bstp_state_before_learning(bif)) { 1836 struct bridge_iflist *_bif; 1837 struct ifnet *_ifp = NULL; 1838 int s; 1839 struct psref _psref; 1840 1841 BRIDGE_PSZ_RENTER(s); 1842 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1843 /* It is destined for us. */ 1844 if (bridge_ourether(_bif, eh, 0)) { 1845 bridge_acquire_member(sc, _bif, &_psref); 1846 BRIDGE_PSZ_REXIT(s); 1847 if (_bif->bif_flags & IFBIF_LEARNING) 1848 (void) bridge_rtupdate(sc, 1849 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1850 m_set_rcvif(m, _bif->bif_ifp); 1851 _ifp = _bif->bif_ifp; 1852 bridge_release_member(sc, _bif, &_psref); 1853 goto out; 1854 } 1855 1856 /* We just received a packet that we sent out. */ 1857 if (bridge_ourether(_bif, eh, 1)) 1858 break; 1859 } 1860 BRIDGE_PSZ_REXIT(s); 1861 out: 1862 1863 if (_bif != NULL) { 1864 bridge_release_member(sc, bif, &psref); 1865 if (_ifp != NULL) { 1866 m->m_flags &= ~M_PROMISC; 1867 ACQUIRE_GLOBAL_LOCKS(); 1868 ether_input(_ifp, m); 1869 RELEASE_GLOBAL_LOCKS(); 1870 } else 1871 m_freem(m); 1872 return; 1873 } 1874 } 1875 1876 /* Tap off 802.1D packets; they do not get forwarded. */ 1877 if (bif->bif_flags & IFBIF_STP && 1878 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1879 bstp_input(sc, bif, m); 1880 bridge_release_member(sc, bif, &psref); 1881 return; 1882 } 1883 1884 /* 1885 * A normal switch would discard the packet here, but that's not what 1886 * we've done historically. This also prevents some obnoxious behaviour. 1887 */ 1888 if (bstp_state_before_learning(bif)) { 1889 bridge_release_member(sc, bif, &psref); 1890 ACQUIRE_GLOBAL_LOCKS(); 1891 ether_input(ifp, m); 1892 RELEASE_GLOBAL_LOCKS(); 1893 return; 1894 } 1895 1896 bridge_release_member(sc, bif, &psref); 1897 1898 bridge_forward(sc, m); 1899 } 1900 1901 /* 1902 * bridge_broadcast: 1903 * 1904 * Send a frame to all interfaces that are members of 1905 * the bridge, except for the one on which the packet 1906 * arrived. 1907 */ 1908 static void 1909 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1910 struct mbuf *m) 1911 { 1912 struct bridge_iflist *bif; 1913 struct mbuf *mc; 1914 struct ifnet *dst_if; 1915 bool bmcast; 1916 int s; 1917 DECLARE_LOCK_VARIABLE; 1918 1919 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1920 1921 BRIDGE_PSZ_RENTER(s); 1922 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1923 struct psref psref; 1924 1925 bridge_acquire_member(sc, bif, &psref); 1926 BRIDGE_PSZ_REXIT(s); 1927 1928 dst_if = bif->bif_ifp; 1929 1930 if (bif->bif_flags & IFBIF_STP) { 1931 switch (bif->bif_state) { 1932 case BSTP_IFSTATE_BLOCKING: 1933 case BSTP_IFSTATE_DISABLED: 1934 goto next; 1935 } 1936 } 1937 1938 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1939 goto next; 1940 1941 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1942 goto next; 1943 1944 if (dst_if != src_if) { 1945 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1946 if (mc == NULL) { 1947 sc->sc_if.if_oerrors++; 1948 goto next; 1949 } 1950 ACQUIRE_GLOBAL_LOCKS(); 1951 bridge_enqueue(sc, dst_if, mc, 1); 1952 RELEASE_GLOBAL_LOCKS(); 1953 } 1954 1955 if (bmcast) { 1956 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1957 if (mc == NULL) { 1958 sc->sc_if.if_oerrors++; 1959 goto next; 1960 } 1961 1962 m_set_rcvif(mc, dst_if); 1963 mc->m_flags &= ~M_PROMISC; 1964 1965 ACQUIRE_GLOBAL_LOCKS(); 1966 ether_input(dst_if, mc); 1967 RELEASE_GLOBAL_LOCKS(); 1968 } 1969 next: 1970 BRIDGE_PSZ_RENTER(s); 1971 bridge_release_member(sc, bif, &psref); 1972 } 1973 BRIDGE_PSZ_REXIT(s); 1974 1975 m_freem(m); 1976 } 1977 1978 static int 1979 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1980 struct bridge_rtnode **brtp) 1981 { 1982 struct bridge_rtnode *brt; 1983 int error; 1984 1985 if (sc->sc_brtcnt >= sc->sc_brtmax) 1986 return ENOSPC; 1987 1988 /* 1989 * Allocate a new bridge forwarding node, and 1990 * initialize the expiration time and Ethernet 1991 * address. 1992 */ 1993 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1994 if (brt == NULL) 1995 return ENOMEM; 1996 1997 memset(brt, 0, sizeof(*brt)); 1998 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1999 brt->brt_flags = IFBAF_DYNAMIC; 2000 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2001 2002 BRIDGE_RT_LOCK(sc); 2003 error = bridge_rtnode_insert(sc, brt); 2004 BRIDGE_RT_UNLOCK(sc); 2005 2006 if (error != 0) { 2007 pool_put(&bridge_rtnode_pool, brt); 2008 return error; 2009 } 2010 2011 *brtp = brt; 2012 return 0; 2013 } 2014 2015 /* 2016 * bridge_rtupdate: 2017 * 2018 * Add a bridge routing entry. 2019 */ 2020 static int 2021 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2022 struct ifnet *dst_if, int setflags, uint8_t flags) 2023 { 2024 struct bridge_rtnode *brt; 2025 int s; 2026 2027 again: 2028 /* 2029 * A route for this destination might already exist. If so, 2030 * update it, otherwise create a new one. 2031 */ 2032 BRIDGE_RT_RENTER(s); 2033 brt = bridge_rtnode_lookup(sc, dst); 2034 2035 if (brt != NULL) { 2036 brt->brt_ifp = dst_if; 2037 if (setflags) { 2038 brt->brt_flags = flags; 2039 if (flags & IFBAF_STATIC) 2040 brt->brt_expire = 0; 2041 else 2042 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2043 } else { 2044 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2045 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2046 } 2047 } 2048 BRIDGE_RT_REXIT(s); 2049 2050 if (brt == NULL) { 2051 int r; 2052 2053 r = bridge_rtalloc(sc, dst, &brt); 2054 if (r != 0) 2055 return r; 2056 goto again; 2057 } 2058 2059 return 0; 2060 } 2061 2062 /* 2063 * bridge_rtlookup: 2064 * 2065 * Lookup the destination interface for an address. 2066 */ 2067 static struct ifnet * 2068 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2069 { 2070 struct bridge_rtnode *brt; 2071 struct ifnet *ifs = NULL; 2072 int s; 2073 2074 BRIDGE_RT_RENTER(s); 2075 brt = bridge_rtnode_lookup(sc, addr); 2076 if (brt != NULL) 2077 ifs = brt->brt_ifp; 2078 BRIDGE_RT_REXIT(s); 2079 2080 return ifs; 2081 } 2082 2083 typedef bool (*bridge_iterate_cb_t) 2084 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2085 2086 /* 2087 * bridge_rtlist_iterate_remove: 2088 * 2089 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2090 * callback judges to remove. Removals of rtnodes are done in a manner 2091 * of pserialize. To this end, all kmem_* operations are placed out of 2092 * mutexes. 2093 */ 2094 static void 2095 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2096 { 2097 struct bridge_rtnode *brt, *nbrt; 2098 struct bridge_rtnode **brt_list; 2099 int i, count; 2100 2101 retry: 2102 count = sc->sc_brtcnt; 2103 if (count == 0) 2104 return; 2105 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2106 2107 BRIDGE_RT_LOCK(sc); 2108 if (__predict_false(sc->sc_brtcnt > count)) { 2109 /* The rtnodes increased, we need more memory */ 2110 BRIDGE_RT_UNLOCK(sc); 2111 kmem_free(brt_list, sizeof(*brt_list) * count); 2112 goto retry; 2113 } 2114 2115 i = 0; 2116 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2117 bool need_break = false; 2118 if (func(sc, brt, &need_break, arg)) { 2119 bridge_rtnode_remove(sc, brt); 2120 brt_list[i++] = brt; 2121 } 2122 if (need_break) 2123 break; 2124 } 2125 2126 if (i > 0) 2127 BRIDGE_RT_PSZ_PERFORM(sc); 2128 BRIDGE_RT_UNLOCK(sc); 2129 2130 while (--i >= 0) 2131 bridge_rtnode_destroy(brt_list[i]); 2132 2133 kmem_free(brt_list, sizeof(*brt_list) * count); 2134 } 2135 2136 static bool 2137 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2138 bool *need_break, void *arg) 2139 { 2140 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2141 /* Take into account of the subsequent removal */ 2142 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2143 *need_break = true; 2144 return true; 2145 } else 2146 return false; 2147 } 2148 2149 static void 2150 bridge_rttrim0(struct bridge_softc *sc) 2151 { 2152 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2153 } 2154 2155 /* 2156 * bridge_rttrim: 2157 * 2158 * Trim the routine table so that we have a number 2159 * of routing entries less than or equal to the 2160 * maximum number. 2161 */ 2162 static void 2163 bridge_rttrim(struct bridge_softc *sc) 2164 { 2165 2166 /* Make sure we actually need to do this. */ 2167 if (sc->sc_brtcnt <= sc->sc_brtmax) 2168 return; 2169 2170 /* Force an aging cycle; this might trim enough addresses. */ 2171 bridge_rtage(sc); 2172 if (sc->sc_brtcnt <= sc->sc_brtmax) 2173 return; 2174 2175 bridge_rttrim0(sc); 2176 2177 return; 2178 } 2179 2180 /* 2181 * bridge_timer: 2182 * 2183 * Aging timer for the bridge. 2184 */ 2185 static void 2186 bridge_timer(void *arg) 2187 { 2188 struct bridge_softc *sc = arg; 2189 2190 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2191 } 2192 2193 static void 2194 bridge_rtage_work(struct work *wk, void *arg) 2195 { 2196 struct bridge_softc *sc = arg; 2197 2198 KASSERT(wk == &sc->sc_rtage_wk); 2199 2200 bridge_rtage(sc); 2201 2202 if (sc->sc_if.if_flags & IFF_RUNNING) 2203 callout_reset(&sc->sc_brcallout, 2204 bridge_rtable_prune_period * hz, bridge_timer, sc); 2205 } 2206 2207 static bool 2208 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2209 bool *need_break, void *arg) 2210 { 2211 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2212 time_uptime >= brt->brt_expire) 2213 return true; 2214 else 2215 return false; 2216 } 2217 2218 /* 2219 * bridge_rtage: 2220 * 2221 * Perform an aging cycle. 2222 */ 2223 static void 2224 bridge_rtage(struct bridge_softc *sc) 2225 { 2226 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2227 } 2228 2229 2230 static bool 2231 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2232 bool *need_break, void *arg) 2233 { 2234 int full = *(int*)arg; 2235 2236 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2237 return true; 2238 else 2239 return false; 2240 } 2241 2242 /* 2243 * bridge_rtflush: 2244 * 2245 * Remove all dynamic addresses from the bridge. 2246 */ 2247 static void 2248 bridge_rtflush(struct bridge_softc *sc, int full) 2249 { 2250 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2251 } 2252 2253 /* 2254 * bridge_rtdaddr: 2255 * 2256 * Remove an address from the table. 2257 */ 2258 static int 2259 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2260 { 2261 struct bridge_rtnode *brt; 2262 2263 BRIDGE_RT_LOCK(sc); 2264 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2265 BRIDGE_RT_UNLOCK(sc); 2266 return ENOENT; 2267 } 2268 bridge_rtnode_remove(sc, brt); 2269 BRIDGE_RT_PSZ_PERFORM(sc); 2270 BRIDGE_RT_UNLOCK(sc); 2271 2272 bridge_rtnode_destroy(brt); 2273 2274 return 0; 2275 } 2276 2277 /* 2278 * bridge_rtdelete: 2279 * 2280 * Delete routes to a speicifc member interface. 2281 */ 2282 static void 2283 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2284 { 2285 struct bridge_rtnode *brt; 2286 2287 BRIDGE_RT_LOCK(sc); 2288 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2289 if (brt->brt_ifp == ifp) 2290 break; 2291 } 2292 if (brt == NULL) { 2293 BRIDGE_RT_UNLOCK(sc); 2294 return; 2295 } 2296 bridge_rtnode_remove(sc, brt); 2297 BRIDGE_RT_PSZ_PERFORM(sc); 2298 BRIDGE_RT_UNLOCK(sc); 2299 2300 bridge_rtnode_destroy(brt); 2301 } 2302 2303 /* 2304 * bridge_rtable_init: 2305 * 2306 * Initialize the route table for this bridge. 2307 */ 2308 static void 2309 bridge_rtable_init(struct bridge_softc *sc) 2310 { 2311 int i; 2312 2313 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2314 KM_SLEEP); 2315 2316 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2317 LIST_INIT(&sc->sc_rthash[i]); 2318 2319 sc->sc_rthash_key = cprng_fast32(); 2320 2321 LIST_INIT(&sc->sc_rtlist); 2322 2323 sc->sc_rtlist_psz = pserialize_create(); 2324 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2325 } 2326 2327 /* 2328 * bridge_rtable_fini: 2329 * 2330 * Deconstruct the route table for this bridge. 2331 */ 2332 static void 2333 bridge_rtable_fini(struct bridge_softc *sc) 2334 { 2335 2336 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2337 if (sc->sc_rtlist_lock) 2338 mutex_obj_free(sc->sc_rtlist_lock); 2339 if (sc->sc_rtlist_psz) 2340 pserialize_destroy(sc->sc_rtlist_psz); 2341 } 2342 2343 /* 2344 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2345 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2346 */ 2347 #define mix(a, b, c) \ 2348 do { \ 2349 a -= b; a -= c; a ^= (c >> 13); \ 2350 b -= c; b -= a; b ^= (a << 8); \ 2351 c -= a; c -= b; c ^= (b >> 13); \ 2352 a -= b; a -= c; a ^= (c >> 12); \ 2353 b -= c; b -= a; b ^= (a << 16); \ 2354 c -= a; c -= b; c ^= (b >> 5); \ 2355 a -= b; a -= c; a ^= (c >> 3); \ 2356 b -= c; b -= a; b ^= (a << 10); \ 2357 c -= a; c -= b; c ^= (b >> 15); \ 2358 } while (/*CONSTCOND*/0) 2359 2360 static inline uint32_t 2361 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2362 { 2363 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2364 2365 b += addr[5] << 8; 2366 b += addr[4]; 2367 a += addr[3] << 24; 2368 a += addr[2] << 16; 2369 a += addr[1] << 8; 2370 a += addr[0]; 2371 2372 mix(a, b, c); 2373 2374 return (c & BRIDGE_RTHASH_MASK); 2375 } 2376 2377 #undef mix 2378 2379 /* 2380 * bridge_rtnode_lookup: 2381 * 2382 * Look up a bridge route node for the specified destination. 2383 */ 2384 static struct bridge_rtnode * 2385 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2386 { 2387 struct bridge_rtnode *brt; 2388 uint32_t hash; 2389 int dir; 2390 2391 hash = bridge_rthash(sc, addr); 2392 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2393 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2394 if (dir == 0) 2395 return (brt); 2396 if (dir > 0) 2397 return (NULL); 2398 } 2399 2400 return (NULL); 2401 } 2402 2403 /* 2404 * bridge_rtnode_insert: 2405 * 2406 * Insert the specified bridge node into the route table. We 2407 * assume the entry is not already in the table. 2408 */ 2409 static int 2410 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2411 { 2412 struct bridge_rtnode *lbrt; 2413 uint32_t hash; 2414 int dir; 2415 2416 KASSERT(BRIDGE_RT_LOCKED(sc)); 2417 2418 hash = bridge_rthash(sc, brt->brt_addr); 2419 2420 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2421 if (lbrt == NULL) { 2422 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2423 goto out; 2424 } 2425 2426 do { 2427 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2428 if (dir == 0) 2429 return (EEXIST); 2430 if (dir > 0) { 2431 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2432 goto out; 2433 } 2434 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2435 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2436 goto out; 2437 } 2438 lbrt = LIST_NEXT(lbrt, brt_hash); 2439 } while (lbrt != NULL); 2440 2441 #ifdef DIAGNOSTIC 2442 panic("bridge_rtnode_insert: impossible"); 2443 #endif 2444 2445 out: 2446 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2447 sc->sc_brtcnt++; 2448 2449 return (0); 2450 } 2451 2452 /* 2453 * bridge_rtnode_remove: 2454 * 2455 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2456 */ 2457 static void 2458 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2459 { 2460 2461 KASSERT(BRIDGE_RT_LOCKED(sc)); 2462 2463 LIST_REMOVE(brt, brt_hash); 2464 LIST_REMOVE(brt, brt_list); 2465 sc->sc_brtcnt--; 2466 } 2467 2468 /* 2469 * bridge_rtnode_destroy: 2470 * 2471 * Destroy a bridge rtnode. 2472 */ 2473 static void 2474 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2475 { 2476 2477 pool_put(&bridge_rtnode_pool, brt); 2478 } 2479 2480 #if defined(BRIDGE_IPF) 2481 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2482 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2483 2484 /* 2485 * Send bridge packets through IPF if they are one of the types IPF can deal 2486 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2487 * question.) 2488 */ 2489 static int 2490 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2491 { 2492 int snap, error; 2493 struct ether_header *eh1, eh2; 2494 struct llc llc1; 2495 uint16_t ether_type; 2496 2497 snap = 0; 2498 error = -1; /* Default error if not error == 0 */ 2499 eh1 = mtod(*mp, struct ether_header *); 2500 ether_type = ntohs(eh1->ether_type); 2501 2502 /* 2503 * Check for SNAP/LLC. 2504 */ 2505 if (ether_type < ETHERMTU) { 2506 struct llc *llc2 = (struct llc *)(eh1 + 1); 2507 2508 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2509 llc2->llc_dsap == LLC_SNAP_LSAP && 2510 llc2->llc_ssap == LLC_SNAP_LSAP && 2511 llc2->llc_control == LLC_UI) { 2512 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2513 snap = 1; 2514 } 2515 } 2516 2517 /* 2518 * If we're trying to filter bridge traffic, don't look at anything 2519 * other than IP and ARP traffic. If the filter doesn't understand 2520 * IPv6, don't allow IPv6 through the bridge either. This is lame 2521 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2522 * but of course we don't have an AppleTalk filter to begin with. 2523 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2524 * ARP traffic.) 2525 */ 2526 switch (ether_type) { 2527 case ETHERTYPE_ARP: 2528 case ETHERTYPE_REVARP: 2529 return 0; /* Automatically pass */ 2530 case ETHERTYPE_IP: 2531 # ifdef INET6 2532 case ETHERTYPE_IPV6: 2533 # endif /* INET6 */ 2534 break; 2535 default: 2536 goto bad; 2537 } 2538 2539 /* Strip off the Ethernet header and keep a copy. */ 2540 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2541 m_adj(*mp, ETHER_HDR_LEN); 2542 2543 /* Strip off snap header, if present */ 2544 if (snap) { 2545 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2546 m_adj(*mp, sizeof(struct llc)); 2547 } 2548 2549 /* 2550 * Check basic packet sanity and run IPF through pfil. 2551 */ 2552 KASSERT(!cpu_intr_p()); 2553 switch (ether_type) 2554 { 2555 case ETHERTYPE_IP : 2556 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2557 if (error == 0) 2558 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2559 break; 2560 # ifdef INET6 2561 case ETHERTYPE_IPV6 : 2562 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2563 if (error == 0) 2564 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2565 break; 2566 # endif 2567 default : 2568 error = 0; 2569 break; 2570 } 2571 2572 if (*mp == NULL) 2573 return error; 2574 if (error != 0) 2575 goto bad; 2576 2577 error = -1; 2578 2579 /* 2580 * Finally, put everything back the way it was and return 2581 */ 2582 if (snap) { 2583 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2584 if (*mp == NULL) 2585 return error; 2586 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2587 } 2588 2589 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2590 if (*mp == NULL) 2591 return error; 2592 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2593 2594 return 0; 2595 2596 bad: 2597 m_freem(*mp); 2598 *mp = NULL; 2599 return error; 2600 } 2601 2602 /* 2603 * Perform basic checks on header size since 2604 * IPF assumes ip_input has already processed 2605 * it for it. Cut-and-pasted from ip_input.c. 2606 * Given how simple the IPv6 version is, 2607 * does the IPv4 version really need to be 2608 * this complicated? 2609 * 2610 * XXX Should we update ipstat here, or not? 2611 * XXX Right now we update ipstat but not 2612 * XXX csum_counter. 2613 */ 2614 static int 2615 bridge_ip_checkbasic(struct mbuf **mp) 2616 { 2617 struct mbuf *m = *mp; 2618 struct ip *ip; 2619 int len, hlen; 2620 2621 if (*mp == NULL) 2622 return -1; 2623 2624 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2625 if ((m = m_copyup(m, sizeof(struct ip), 2626 (max_linkhdr + 3) & ~3)) == NULL) { 2627 /* XXXJRT new stat, please */ 2628 ip_statinc(IP_STAT_TOOSMALL); 2629 goto bad; 2630 } 2631 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2632 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2633 ip_statinc(IP_STAT_TOOSMALL); 2634 goto bad; 2635 } 2636 } 2637 ip = mtod(m, struct ip *); 2638 if (ip == NULL) goto bad; 2639 2640 if (ip->ip_v != IPVERSION) { 2641 ip_statinc(IP_STAT_BADVERS); 2642 goto bad; 2643 } 2644 hlen = ip->ip_hl << 2; 2645 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2646 ip_statinc(IP_STAT_BADHLEN); 2647 goto bad; 2648 } 2649 if (hlen > m->m_len) { 2650 if ((m = m_pullup(m, hlen)) == 0) { 2651 ip_statinc(IP_STAT_BADHLEN); 2652 goto bad; 2653 } 2654 ip = mtod(m, struct ip *); 2655 if (ip == NULL) goto bad; 2656 } 2657 2658 switch (m->m_pkthdr.csum_flags & 2659 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2660 M_CSUM_IPv4_BAD)) { 2661 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2662 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2663 goto bad; 2664 2665 case M_CSUM_IPv4: 2666 /* Checksum was okay. */ 2667 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2668 break; 2669 2670 default: 2671 /* Must compute it ourselves. */ 2672 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2673 if (in_cksum(m, hlen) != 0) 2674 goto bad; 2675 break; 2676 } 2677 2678 /* Retrieve the packet length. */ 2679 len = ntohs(ip->ip_len); 2680 2681 /* 2682 * Check for additional length bogosity 2683 */ 2684 if (len < hlen) { 2685 ip_statinc(IP_STAT_BADLEN); 2686 goto bad; 2687 } 2688 2689 /* 2690 * Check that the amount of data in the buffers 2691 * is as at least much as the IP header would have us expect. 2692 * Drop packet if shorter than we expect. 2693 */ 2694 if (m->m_pkthdr.len < len) { 2695 ip_statinc(IP_STAT_TOOSHORT); 2696 goto bad; 2697 } 2698 2699 /* Checks out, proceed */ 2700 *mp = m; 2701 return 0; 2702 2703 bad: 2704 *mp = m; 2705 return -1; 2706 } 2707 2708 # ifdef INET6 2709 /* 2710 * Same as above, but for IPv6. 2711 * Cut-and-pasted from ip6_input.c. 2712 * XXX Should we update ip6stat, or not? 2713 */ 2714 static int 2715 bridge_ip6_checkbasic(struct mbuf **mp) 2716 { 2717 struct mbuf *m = *mp; 2718 struct ip6_hdr *ip6; 2719 2720 /* 2721 * If the IPv6 header is not aligned, slurp it up into a new 2722 * mbuf with space for link headers, in the event we forward 2723 * it. Otherwise, if it is aligned, make sure the entire base 2724 * IPv6 header is in the first mbuf of the chain. 2725 */ 2726 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2727 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2728 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2729 (max_linkhdr + 3) & ~3)) == NULL) { 2730 /* XXXJRT new stat, please */ 2731 ip6_statinc(IP6_STAT_TOOSMALL); 2732 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2733 goto bad; 2734 } 2735 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2736 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2737 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2738 ip6_statinc(IP6_STAT_TOOSMALL); 2739 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2740 goto bad; 2741 } 2742 } 2743 2744 ip6 = mtod(m, struct ip6_hdr *); 2745 2746 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2747 ip6_statinc(IP6_STAT_BADVERS); 2748 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2749 goto bad; 2750 } 2751 2752 /* Checks out, proceed */ 2753 *mp = m; 2754 return 0; 2755 2756 bad: 2757 *mp = m; 2758 return -1; 2759 } 2760 # endif /* INET6 */ 2761 #endif /* BRIDGE_IPF */ 2762
Indexes created Fri Oct 03 02:09:57 GMT 2025