if_bridge.c revision 1.134.6.1
1 /* $NetBSD: if_bridge.c,v 1.134.6.1 2017/10/02 13:33:41 martin 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 1.134.6.1 2017/10/02 13:33:41 martin 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 = splsoftnet(); \ 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 = splsoftnet(); 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 splsoftnet(). */ 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 = splsoftnet(); 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 splsoftnet(). */ 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 (ifs->if_bridge == sc) { 739 error = EEXIST; 740 goto out; 741 } 742 743 if (ifs->if_bridge != NULL) { 744 error = EBUSY; 745 goto out; 746 } 747 748 if (ifs->_if_input != ether_input) { 749 error = EINVAL; 750 goto out; 751 } 752 753 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 754 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 755 error = EINVAL; 756 goto out; 757 } 758 759 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 760 761 switch (ifs->if_type) { 762 case IFT_ETHER: 763 if (sc->sc_if.if_mtu != ifs->if_mtu) { 764 error = EINVAL; 765 goto out; 766 } 767 /* FALLTHROUGH */ 768 case IFT_L2TP: 769 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 770 goto out; 771 /* 772 * Place the interface into promiscuous mode. 773 */ 774 error = ifpromisc(ifs, 1); 775 if (error) 776 goto out; 777 break; 778 default: 779 error = EINVAL; 780 goto out; 781 } 782 783 bif->bif_ifp = ifs; 784 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 785 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 786 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 787 PSLIST_ENTRY_INIT(bif, bif_next); 788 psref_target_init(&bif->bif_psref, bridge_psref_class); 789 790 BRIDGE_LOCK(sc); 791 792 ifs->if_bridge = sc; 793 ifs->if_bridgeif = bif; 794 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 795 ifs->_if_input = bridge_input; 796 797 BRIDGE_UNLOCK(sc); 798 799 if (sc->sc_if.if_flags & IFF_RUNNING) 800 bstp_initialization(sc); 801 else 802 bstp_stop(sc); 803 804 out: 805 if_put(ifs, &psref); 806 if (error) { 807 if (bif != NULL) 808 kmem_free(bif, sizeof(*bif)); 809 } 810 return (error); 811 } 812 813 static int 814 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 815 { 816 struct ifbreq *req = arg; 817 const char *name = req->ifbr_ifsname; 818 struct bridge_iflist *bif; 819 struct ifnet *ifs; 820 821 BRIDGE_LOCK(sc); 822 823 /* 824 * Don't use bridge_lookup_member. We want to get a member 825 * with bif_refs == 0. 826 */ 827 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 828 ifs = bif->bif_ifp; 829 if (strcmp(ifs->if_xname, name) == 0) 830 break; 831 } 832 833 if (bif == NULL) { 834 BRIDGE_UNLOCK(sc); 835 return ENOENT; 836 } 837 838 bridge_delete_member(sc, bif); 839 840 BRIDGE_UNLOCK(sc); 841 842 switch (ifs->if_type) { 843 case IFT_ETHER: 844 case IFT_L2TP: 845 /* 846 * Take the interface out of promiscuous mode. 847 * Don't call it with holding a spin lock. 848 */ 849 (void) ifpromisc(ifs, 0); 850 (void) ether_disable_vlan_mtu(ifs); 851 break; 852 default: 853 #ifdef DIAGNOSTIC 854 panic("bridge_delete_member: impossible"); 855 #endif 856 break; 857 } 858 859 bridge_rtdelete(sc, ifs); 860 861 if (sc->sc_if.if_flags & IFF_RUNNING) 862 bstp_initialization(sc); 863 864 return 0; 865 } 866 867 static int 868 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 869 { 870 struct ifbreq *req = arg; 871 struct bridge_iflist *bif; 872 struct psref psref; 873 874 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 875 if (bif == NULL) 876 return (ENOENT); 877 878 req->ifbr_ifsflags = bif->bif_flags; 879 req->ifbr_state = bif->bif_state; 880 req->ifbr_priority = bif->bif_priority; 881 req->ifbr_path_cost = bif->bif_path_cost; 882 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 883 884 bridge_release_member(sc, bif, &psref); 885 886 return (0); 887 } 888 889 static int 890 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 891 { 892 struct ifbreq *req = arg; 893 struct bridge_iflist *bif; 894 struct psref psref; 895 896 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 897 if (bif == NULL) 898 return (ENOENT); 899 900 if (req->ifbr_ifsflags & IFBIF_STP) { 901 switch (bif->bif_ifp->if_type) { 902 case IFT_ETHER: 903 case IFT_L2TP: 904 /* These can do spanning tree. */ 905 break; 906 907 default: 908 /* Nothing else can. */ 909 bridge_release_member(sc, bif, &psref); 910 return (EINVAL); 911 } 912 } 913 914 bif->bif_flags = req->ifbr_ifsflags; 915 916 bridge_release_member(sc, bif, &psref); 917 918 if (sc->sc_if.if_flags & IFF_RUNNING) 919 bstp_initialization(sc); 920 921 return (0); 922 } 923 924 static int 925 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 926 { 927 struct ifbrparam *param = arg; 928 929 sc->sc_brtmax = param->ifbrp_csize; 930 bridge_rttrim(sc); 931 932 return (0); 933 } 934 935 static int 936 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 937 { 938 struct ifbrparam *param = arg; 939 940 param->ifbrp_csize = sc->sc_brtmax; 941 942 return (0); 943 } 944 945 static int 946 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 947 { 948 struct ifbifconf *bifc = arg; 949 struct bridge_iflist *bif; 950 struct ifbreq *breqs; 951 int i, count, error = 0; 952 953 retry: 954 BRIDGE_LOCK(sc); 955 count = 0; 956 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 957 count++; 958 BRIDGE_UNLOCK(sc); 959 960 if (count == 0) { 961 bifc->ifbic_len = 0; 962 return 0; 963 } 964 965 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 966 /* Tell that a larger buffer is needed */ 967 bifc->ifbic_len = sizeof(*breqs) * count; 968 return 0; 969 } 970 971 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 972 973 BRIDGE_LOCK(sc); 974 975 i = 0; 976 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 977 i++; 978 if (i > count) { 979 /* 980 * The number of members has been increased. 981 * We need more memory! 982 */ 983 BRIDGE_UNLOCK(sc); 984 kmem_free(breqs, sizeof(*breqs) * count); 985 goto retry; 986 } 987 988 i = 0; 989 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 990 struct ifbreq *breq = &breqs[i++]; 991 memset(breq, 0, sizeof(*breq)); 992 993 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 994 sizeof(breq->ifbr_ifsname)); 995 breq->ifbr_ifsflags = bif->bif_flags; 996 breq->ifbr_state = bif->bif_state; 997 breq->ifbr_priority = bif->bif_priority; 998 breq->ifbr_path_cost = bif->bif_path_cost; 999 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1000 } 1001 1002 /* Don't call copyout with holding the mutex */ 1003 BRIDGE_UNLOCK(sc); 1004 1005 for (i = 0; i < count; i++) { 1006 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1007 if (error) 1008 break; 1009 } 1010 bifc->ifbic_len = sizeof(*breqs) * i; 1011 1012 kmem_free(breqs, sizeof(*breqs) * count); 1013 1014 return error; 1015 } 1016 1017 static int 1018 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1019 { 1020 struct ifbaconf *bac = arg; 1021 struct bridge_rtnode *brt; 1022 struct ifbareq bareq; 1023 int count = 0, error = 0, len; 1024 1025 if (bac->ifbac_len == 0) 1026 return (0); 1027 1028 BRIDGE_RT_LOCK(sc); 1029 1030 len = bac->ifbac_len; 1031 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1032 if (len < sizeof(bareq)) 1033 goto out; 1034 memset(&bareq, 0, sizeof(bareq)); 1035 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1036 sizeof(bareq.ifba_ifsname)); 1037 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1038 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1039 bareq.ifba_expire = brt->brt_expire - time_uptime; 1040 } else 1041 bareq.ifba_expire = 0; 1042 bareq.ifba_flags = brt->brt_flags; 1043 1044 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1045 if (error) 1046 goto out; 1047 count++; 1048 len -= sizeof(bareq); 1049 } 1050 out: 1051 BRIDGE_RT_UNLOCK(sc); 1052 1053 bac->ifbac_len = sizeof(bareq) * count; 1054 return (error); 1055 } 1056 1057 static int 1058 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1059 { 1060 struct ifbareq *req = arg; 1061 struct bridge_iflist *bif; 1062 int error; 1063 struct psref psref; 1064 1065 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1066 if (bif == NULL) 1067 return (ENOENT); 1068 1069 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1070 req->ifba_flags); 1071 1072 bridge_release_member(sc, bif, &psref); 1073 1074 return (error); 1075 } 1076 1077 static int 1078 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1079 { 1080 struct ifbrparam *param = arg; 1081 1082 sc->sc_brttimeout = param->ifbrp_ctime; 1083 1084 return (0); 1085 } 1086 1087 static int 1088 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1089 { 1090 struct ifbrparam *param = arg; 1091 1092 param->ifbrp_ctime = sc->sc_brttimeout; 1093 1094 return (0); 1095 } 1096 1097 static int 1098 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1099 { 1100 struct ifbareq *req = arg; 1101 1102 return (bridge_rtdaddr(sc, req->ifba_dst)); 1103 } 1104 1105 static int 1106 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1107 { 1108 struct ifbreq *req = arg; 1109 1110 bridge_rtflush(sc, req->ifbr_ifsflags); 1111 1112 return (0); 1113 } 1114 1115 static int 1116 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1117 { 1118 struct ifbrparam *param = arg; 1119 1120 param->ifbrp_prio = sc->sc_bridge_priority; 1121 1122 return (0); 1123 } 1124 1125 static int 1126 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1127 { 1128 struct ifbrparam *param = arg; 1129 1130 sc->sc_bridge_priority = param->ifbrp_prio; 1131 1132 if (sc->sc_if.if_flags & IFF_RUNNING) 1133 bstp_initialization(sc); 1134 1135 return (0); 1136 } 1137 1138 static int 1139 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1140 { 1141 struct ifbrparam *param = arg; 1142 1143 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1144 1145 return (0); 1146 } 1147 1148 static int 1149 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1150 { 1151 struct ifbrparam *param = arg; 1152 1153 if (param->ifbrp_hellotime == 0) 1154 return (EINVAL); 1155 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1156 1157 if (sc->sc_if.if_flags & IFF_RUNNING) 1158 bstp_initialization(sc); 1159 1160 return (0); 1161 } 1162 1163 static int 1164 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1165 { 1166 struct ifbrparam *param = arg; 1167 1168 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1169 1170 return (0); 1171 } 1172 1173 static int 1174 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1175 { 1176 struct ifbrparam *param = arg; 1177 1178 if (param->ifbrp_fwddelay == 0) 1179 return (EINVAL); 1180 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1181 1182 if (sc->sc_if.if_flags & IFF_RUNNING) 1183 bstp_initialization(sc); 1184 1185 return (0); 1186 } 1187 1188 static int 1189 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1190 { 1191 struct ifbrparam *param = arg; 1192 1193 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1194 1195 return (0); 1196 } 1197 1198 static int 1199 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1200 { 1201 struct ifbrparam *param = arg; 1202 1203 if (param->ifbrp_maxage == 0) 1204 return (EINVAL); 1205 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1206 1207 if (sc->sc_if.if_flags & IFF_RUNNING) 1208 bstp_initialization(sc); 1209 1210 return (0); 1211 } 1212 1213 static int 1214 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1215 { 1216 struct ifbreq *req = arg; 1217 struct bridge_iflist *bif; 1218 struct psref psref; 1219 1220 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1221 if (bif == NULL) 1222 return (ENOENT); 1223 1224 bif->bif_priority = req->ifbr_priority; 1225 1226 if (sc->sc_if.if_flags & IFF_RUNNING) 1227 bstp_initialization(sc); 1228 1229 bridge_release_member(sc, bif, &psref); 1230 1231 return (0); 1232 } 1233 1234 #if defined(BRIDGE_IPF) 1235 static int 1236 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1237 { 1238 struct ifbrparam *param = arg; 1239 1240 param->ifbrp_filter = sc->sc_filter_flags; 1241 1242 return (0); 1243 } 1244 1245 static int 1246 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1247 { 1248 struct ifbrparam *param = arg; 1249 uint32_t nflags, oflags; 1250 1251 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1252 return (EINVAL); 1253 1254 nflags = param->ifbrp_filter; 1255 oflags = sc->sc_filter_flags; 1256 1257 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1258 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1259 sc->sc_if.if_pfil); 1260 } 1261 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1262 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1263 sc->sc_if.if_pfil); 1264 } 1265 1266 sc->sc_filter_flags = nflags; 1267 1268 return (0); 1269 } 1270 #endif /* BRIDGE_IPF */ 1271 1272 static int 1273 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1274 { 1275 struct ifbreq *req = arg; 1276 struct bridge_iflist *bif; 1277 struct psref psref; 1278 1279 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1280 if (bif == NULL) 1281 return (ENOENT); 1282 1283 bif->bif_path_cost = req->ifbr_path_cost; 1284 1285 if (sc->sc_if.if_flags & IFF_RUNNING) 1286 bstp_initialization(sc); 1287 1288 bridge_release_member(sc, bif, &psref); 1289 1290 return (0); 1291 } 1292 1293 /* 1294 * bridge_ifdetach: 1295 * 1296 * Detach an interface from a bridge. Called when a member 1297 * interface is detaching. 1298 */ 1299 void 1300 bridge_ifdetach(struct ifnet *ifp) 1301 { 1302 struct bridge_softc *sc = ifp->if_bridge; 1303 struct ifbreq breq; 1304 1305 /* ioctl_lock should prevent this from happening */ 1306 KASSERT(sc != NULL); 1307 1308 memset(&breq, 0, sizeof(breq)); 1309 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1310 1311 (void) bridge_ioctl_del(sc, &breq); 1312 } 1313 1314 /* 1315 * bridge_init: 1316 * 1317 * Initialize a bridge interface. 1318 */ 1319 static int 1320 bridge_init(struct ifnet *ifp) 1321 { 1322 struct bridge_softc *sc = ifp->if_softc; 1323 1324 if (ifp->if_flags & IFF_RUNNING) 1325 return (0); 1326 1327 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1328 bridge_timer, sc); 1329 1330 ifp->if_flags |= IFF_RUNNING; 1331 bstp_initialization(sc); 1332 return (0); 1333 } 1334 1335 /* 1336 * bridge_stop: 1337 * 1338 * Stop the bridge interface. 1339 */ 1340 static void 1341 bridge_stop(struct ifnet *ifp, int disable) 1342 { 1343 struct bridge_softc *sc = ifp->if_softc; 1344 1345 if ((ifp->if_flags & IFF_RUNNING) == 0) 1346 return; 1347 1348 callout_stop(&sc->sc_brcallout); 1349 bstp_stop(sc); 1350 1351 bridge_rtflush(sc, IFBF_FLUSHDYN); 1352 1353 ifp->if_flags &= ~IFF_RUNNING; 1354 } 1355 1356 /* 1357 * bridge_enqueue: 1358 * 1359 * Enqueue a packet on a bridge member interface. 1360 */ 1361 void 1362 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1363 int runfilt) 1364 { 1365 int len, error; 1366 short mflags; 1367 1368 /* 1369 * Clear any in-bound checksum flags for this packet. 1370 */ 1371 m->m_pkthdr.csum_flags = 0; 1372 1373 if (runfilt) { 1374 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1375 dst_ifp, PFIL_OUT) != 0) { 1376 if (m != NULL) 1377 m_freem(m); 1378 return; 1379 } 1380 if (m == NULL) 1381 return; 1382 } 1383 1384 #ifdef ALTQ 1385 KERNEL_LOCK(1, NULL); 1386 /* 1387 * If ALTQ is enabled on the member interface, do 1388 * classification; the queueing discipline might 1389 * not require classification, but might require 1390 * the address family/header pointer in the pktattr. 1391 */ 1392 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1393 /* XXX IFT_ETHER */ 1394 altq_etherclassify(&dst_ifp->if_snd, m); 1395 } 1396 KERNEL_UNLOCK_ONE(NULL); 1397 #endif /* ALTQ */ 1398 1399 len = m->m_pkthdr.len; 1400 mflags = m->m_flags; 1401 1402 error = if_transmit_lock(dst_ifp, m); 1403 if (error) { 1404 /* mbuf is already freed */ 1405 sc->sc_if.if_oerrors++; 1406 return; 1407 } 1408 1409 sc->sc_if.if_opackets++; 1410 sc->sc_if.if_obytes += len; 1411 if (mflags & M_MCAST) 1412 sc->sc_if.if_omcasts++; 1413 } 1414 1415 /* 1416 * bridge_output: 1417 * 1418 * Send output from a bridge member interface. This 1419 * performs the bridging function for locally originated 1420 * packets. 1421 * 1422 * The mbuf has the Ethernet header already attached. We must 1423 * enqueue or free the mbuf before returning. 1424 */ 1425 int 1426 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1427 const struct rtentry *rt) 1428 { 1429 struct ether_header *eh; 1430 struct ifnet *dst_if; 1431 struct bridge_softc *sc; 1432 int s; 1433 1434 /* 1435 * bridge_output() is called from ether_output(), furthermore 1436 * ifp argument doesn't point to bridge(4). So, don't assert 1437 * IFEF_OUTPUT_MPSAFE here. 1438 */ 1439 1440 if (m->m_len < ETHER_HDR_LEN) { 1441 m = m_pullup(m, ETHER_HDR_LEN); 1442 if (m == NULL) 1443 return (0); 1444 } 1445 1446 eh = mtod(m, struct ether_header *); 1447 sc = ifp->if_bridge; 1448 1449 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1450 if (memcmp(etherbroadcastaddr, 1451 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1452 m->m_flags |= M_BCAST; 1453 else 1454 m->m_flags |= M_MCAST; 1455 } 1456 1457 /* 1458 * If bridge is down, but the original output interface is up, 1459 * go ahead and send out that interface. Otherwise, the packet 1460 * is dropped below. 1461 */ 1462 if (__predict_false(sc == NULL) || 1463 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1464 dst_if = ifp; 1465 goto sendunicast; 1466 } 1467 1468 /* 1469 * If the packet is a multicast, or we don't know a better way to 1470 * get there, send to all interfaces. 1471 */ 1472 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1473 dst_if = NULL; 1474 else 1475 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1476 if (dst_if == NULL) { 1477 /* XXX Should call bridge_broadcast, but there are locking 1478 * issues which need resolving first. */ 1479 struct bridge_iflist *bif; 1480 struct mbuf *mc; 1481 bool used = false; 1482 1483 BRIDGE_PSZ_RENTER(s); 1484 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1485 struct psref psref; 1486 1487 bridge_acquire_member(sc, bif, &psref); 1488 BRIDGE_PSZ_REXIT(s); 1489 1490 dst_if = bif->bif_ifp; 1491 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1492 goto next; 1493 1494 /* 1495 * If this is not the original output interface, 1496 * and the interface is participating in spanning 1497 * tree, make sure the port is in a state that 1498 * allows forwarding. 1499 */ 1500 if (dst_if != ifp && 1501 (bif->bif_flags & IFBIF_STP) != 0) { 1502 switch (bif->bif_state) { 1503 case BSTP_IFSTATE_BLOCKING: 1504 case BSTP_IFSTATE_LISTENING: 1505 case BSTP_IFSTATE_DISABLED: 1506 goto next; 1507 } 1508 } 1509 1510 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1511 bif_next) == NULL && 1512 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1513 dst_if == ifp)) 1514 { 1515 used = true; 1516 mc = m; 1517 } else { 1518 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1519 if (mc == NULL) { 1520 sc->sc_if.if_oerrors++; 1521 goto next; 1522 } 1523 } 1524 1525 bridge_enqueue(sc, dst_if, mc, 0); 1526 1527 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1528 dst_if != ifp) 1529 { 1530 if (PSLIST_READER_NEXT(bif, 1531 struct bridge_iflist, bif_next) == NULL) 1532 { 1533 used = true; 1534 mc = m; 1535 } else { 1536 mc = m_copym(m, 0, M_COPYALL, 1537 M_DONTWAIT); 1538 if (mc == NULL) { 1539 sc->sc_if.if_oerrors++; 1540 goto next; 1541 } 1542 } 1543 1544 m_set_rcvif(mc, dst_if); 1545 mc->m_flags &= ~M_PROMISC; 1546 1547 #ifndef NET_MPSAFE 1548 s = splsoftnet(); 1549 #endif 1550 ether_input(dst_if, mc); 1551 #ifndef NET_MPSAFE 1552 splx(s); 1553 #endif 1554 } 1555 1556 next: 1557 BRIDGE_PSZ_RENTER(s); 1558 bridge_release_member(sc, bif, &psref); 1559 1560 /* Guarantee we don't re-enter the loop as we already 1561 * decided we're at the end. */ 1562 if (used) 1563 break; 1564 } 1565 BRIDGE_PSZ_REXIT(s); 1566 1567 if (!used) 1568 m_freem(m); 1569 return (0); 1570 } 1571 1572 sendunicast: 1573 /* 1574 * XXX Spanning tree consideration here? 1575 */ 1576 1577 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1578 m_freem(m); 1579 return (0); 1580 } 1581 1582 bridge_enqueue(sc, dst_if, m, 0); 1583 1584 return (0); 1585 } 1586 1587 /* 1588 * bridge_start: 1589 * 1590 * Start output on a bridge. 1591 * 1592 * NOTE: This routine should never be called in this implementation. 1593 */ 1594 static void 1595 bridge_start(struct ifnet *ifp) 1596 { 1597 1598 printf("%s: bridge_start() called\n", ifp->if_xname); 1599 } 1600 1601 /* 1602 * bridge_forward: 1603 * 1604 * The forwarding function of the bridge. 1605 */ 1606 static void 1607 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1608 { 1609 struct bridge_iflist *bif; 1610 struct ifnet *src_if, *dst_if; 1611 struct ether_header *eh; 1612 struct psref psref; 1613 struct psref psref_src; 1614 DECLARE_LOCK_VARIABLE; 1615 1616 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1617 return; 1618 1619 src_if = m_get_rcvif_psref(m, &psref_src); 1620 if (src_if == NULL) { 1621 /* Interface is being destroyed? */ 1622 m_freem(m); 1623 goto out; 1624 } 1625 1626 sc->sc_if.if_ipackets++; 1627 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1628 1629 /* 1630 * Look up the bridge_iflist. 1631 */ 1632 bif = bridge_lookup_member_if(sc, src_if, &psref); 1633 if (bif == NULL) { 1634 /* Interface is not a bridge member (anymore?) */ 1635 m_freem(m); 1636 goto out; 1637 } 1638 1639 if (bif->bif_flags & IFBIF_STP) { 1640 switch (bif->bif_state) { 1641 case BSTP_IFSTATE_BLOCKING: 1642 case BSTP_IFSTATE_LISTENING: 1643 case BSTP_IFSTATE_DISABLED: 1644 m_freem(m); 1645 bridge_release_member(sc, bif, &psref); 1646 goto out; 1647 } 1648 } 1649 1650 eh = mtod(m, struct ether_header *); 1651 1652 /* 1653 * If the interface is learning, and the source 1654 * address is valid and not multicast, record 1655 * the address. 1656 */ 1657 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1658 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1659 (eh->ether_shost[0] == 0 && 1660 eh->ether_shost[1] == 0 && 1661 eh->ether_shost[2] == 0 && 1662 eh->ether_shost[3] == 0 && 1663 eh->ether_shost[4] == 0 && 1664 eh->ether_shost[5] == 0) == 0) { 1665 (void) bridge_rtupdate(sc, eh->ether_shost, 1666 src_if, 0, IFBAF_DYNAMIC); 1667 } 1668 1669 if ((bif->bif_flags & IFBIF_STP) != 0 && 1670 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1671 m_freem(m); 1672 bridge_release_member(sc, bif, &psref); 1673 goto out; 1674 } 1675 1676 bridge_release_member(sc, bif, &psref); 1677 1678 /* 1679 * At this point, the port either doesn't participate 1680 * in spanning tree or it is in the forwarding state. 1681 */ 1682 1683 /* 1684 * If the packet is unicast, destined for someone on 1685 * "this" side of the bridge, drop it. 1686 */ 1687 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1688 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1689 if (src_if == dst_if) { 1690 m_freem(m); 1691 goto out; 1692 } 1693 } else { 1694 /* ...forward it to all interfaces. */ 1695 sc->sc_if.if_imcasts++; 1696 dst_if = NULL; 1697 } 1698 1699 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1700 if (m != NULL) 1701 m_freem(m); 1702 goto out; 1703 } 1704 if (m == NULL) 1705 goto out; 1706 1707 if (dst_if == NULL) { 1708 bridge_broadcast(sc, src_if, m); 1709 goto out; 1710 } 1711 1712 m_put_rcvif_psref(src_if, &psref_src); 1713 src_if = NULL; 1714 1715 /* 1716 * At this point, we're dealing with a unicast frame 1717 * going to a different interface. 1718 */ 1719 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1720 m_freem(m); 1721 goto out; 1722 } 1723 1724 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1725 if (bif == NULL) { 1726 /* Not a member of the bridge (anymore?) */ 1727 m_freem(m); 1728 goto out; 1729 } 1730 1731 if (bif->bif_flags & IFBIF_STP) { 1732 switch (bif->bif_state) { 1733 case BSTP_IFSTATE_DISABLED: 1734 case BSTP_IFSTATE_BLOCKING: 1735 m_freem(m); 1736 bridge_release_member(sc, bif, &psref); 1737 goto out; 1738 } 1739 } 1740 1741 bridge_release_member(sc, bif, &psref); 1742 1743 ACQUIRE_GLOBAL_LOCKS(); 1744 bridge_enqueue(sc, dst_if, m, 1); 1745 RELEASE_GLOBAL_LOCKS(); 1746 out: 1747 if (src_if != NULL) 1748 m_put_rcvif_psref(src_if, &psref_src); 1749 return; 1750 } 1751 1752 static bool 1753 bstp_state_before_learning(struct bridge_iflist *bif) 1754 { 1755 if (bif->bif_flags & IFBIF_STP) { 1756 switch (bif->bif_state) { 1757 case BSTP_IFSTATE_BLOCKING: 1758 case BSTP_IFSTATE_LISTENING: 1759 case BSTP_IFSTATE_DISABLED: 1760 return true; 1761 } 1762 } 1763 return false; 1764 } 1765 1766 static bool 1767 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1768 { 1769 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1770 1771 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1772 #if NCARP > 0 1773 || (bif->bif_ifp->if_carp && 1774 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1775 #endif /* NCARP > 0 */ 1776 ) 1777 return true; 1778 1779 return false; 1780 } 1781 1782 /* 1783 * bridge_input: 1784 * 1785 * Receive input from a member interface. Queue the packet for 1786 * bridging if it is not for us. 1787 */ 1788 static void 1789 bridge_input(struct ifnet *ifp, struct mbuf *m) 1790 { 1791 struct bridge_softc *sc = ifp->if_bridge; 1792 struct bridge_iflist *bif; 1793 struct ether_header *eh; 1794 struct psref psref; 1795 int bound; 1796 DECLARE_LOCK_VARIABLE; 1797 1798 KASSERT(!cpu_intr_p()); 1799 1800 if (__predict_false(sc == NULL) || 1801 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1802 ACQUIRE_GLOBAL_LOCKS(); 1803 ether_input(ifp, m); 1804 RELEASE_GLOBAL_LOCKS(); 1805 return; 1806 } 1807 1808 bound = curlwp_bind(); 1809 bif = bridge_lookup_member_if(sc, ifp, &psref); 1810 if (bif == NULL) { 1811 curlwp_bindx(bound); 1812 ACQUIRE_GLOBAL_LOCKS(); 1813 ether_input(ifp, m); 1814 RELEASE_GLOBAL_LOCKS(); 1815 return; 1816 } 1817 1818 eh = mtod(m, struct ether_header *); 1819 1820 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1821 if (memcmp(etherbroadcastaddr, 1822 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1823 m->m_flags |= M_BCAST; 1824 else 1825 m->m_flags |= M_MCAST; 1826 } 1827 1828 /* 1829 * A 'fast' path for packets addressed to interfaces that are 1830 * part of this bridge. 1831 */ 1832 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1833 !bstp_state_before_learning(bif)) { 1834 struct bridge_iflist *_bif; 1835 struct ifnet *_ifp = NULL; 1836 int s; 1837 struct psref _psref; 1838 1839 BRIDGE_PSZ_RENTER(s); 1840 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1841 /* It is destined for us. */ 1842 if (bridge_ourether(_bif, eh, 0)) { 1843 bridge_acquire_member(sc, _bif, &_psref); 1844 BRIDGE_PSZ_REXIT(s); 1845 if (_bif->bif_flags & IFBIF_LEARNING) 1846 (void) bridge_rtupdate(sc, 1847 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1848 m_set_rcvif(m, _bif->bif_ifp); 1849 _ifp = _bif->bif_ifp; 1850 bridge_release_member(sc, _bif, &_psref); 1851 goto out; 1852 } 1853 1854 /* We just received a packet that we sent out. */ 1855 if (bridge_ourether(_bif, eh, 1)) 1856 break; 1857 } 1858 BRIDGE_PSZ_REXIT(s); 1859 out: 1860 1861 if (_bif != NULL) { 1862 bridge_release_member(sc, bif, &psref); 1863 curlwp_bindx(bound); 1864 if (_ifp != NULL) { 1865 m->m_flags &= ~M_PROMISC; 1866 ACQUIRE_GLOBAL_LOCKS(); 1867 ether_input(_ifp, m); 1868 RELEASE_GLOBAL_LOCKS(); 1869 } else 1870 m_freem(m); 1871 return; 1872 } 1873 } 1874 1875 /* Tap off 802.1D packets; they do not get forwarded. */ 1876 if (bif->bif_flags & IFBIF_STP && 1877 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1878 bstp_input(sc, bif, m); 1879 bridge_release_member(sc, bif, &psref); 1880 curlwp_bindx(bound); 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 curlwp_bindx(bound); 1891 ACQUIRE_GLOBAL_LOCKS(); 1892 ether_input(ifp, m); 1893 RELEASE_GLOBAL_LOCKS(); 1894 return; 1895 } 1896 1897 bridge_release_member(sc, bif, &psref); 1898 1899 bridge_forward(sc, m); 1900 1901 curlwp_bindx(bound); 1902 } 1903 1904 /* 1905 * bridge_broadcast: 1906 * 1907 * Send a frame to all interfaces that are members of 1908 * the bridge, except for the one on which the packet 1909 * arrived. 1910 */ 1911 static void 1912 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1913 struct mbuf *m) 1914 { 1915 struct bridge_iflist *bif; 1916 struct mbuf *mc; 1917 struct ifnet *dst_if; 1918 bool bmcast; 1919 int s; 1920 DECLARE_LOCK_VARIABLE; 1921 1922 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1923 1924 BRIDGE_PSZ_RENTER(s); 1925 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1926 struct psref psref; 1927 1928 bridge_acquire_member(sc, bif, &psref); 1929 BRIDGE_PSZ_REXIT(s); 1930 1931 dst_if = bif->bif_ifp; 1932 1933 if (bif->bif_flags & IFBIF_STP) { 1934 switch (bif->bif_state) { 1935 case BSTP_IFSTATE_BLOCKING: 1936 case BSTP_IFSTATE_DISABLED: 1937 goto next; 1938 } 1939 } 1940 1941 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1942 goto next; 1943 1944 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1945 goto next; 1946 1947 if (dst_if != src_if) { 1948 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1949 if (mc == NULL) { 1950 sc->sc_if.if_oerrors++; 1951 goto next; 1952 } 1953 ACQUIRE_GLOBAL_LOCKS(); 1954 bridge_enqueue(sc, dst_if, mc, 1); 1955 RELEASE_GLOBAL_LOCKS(); 1956 } 1957 1958 if (bmcast) { 1959 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1960 if (mc == NULL) { 1961 sc->sc_if.if_oerrors++; 1962 goto next; 1963 } 1964 1965 m_set_rcvif(mc, dst_if); 1966 mc->m_flags &= ~M_PROMISC; 1967 1968 ACQUIRE_GLOBAL_LOCKS(); 1969 ether_input(dst_if, mc); 1970 RELEASE_GLOBAL_LOCKS(); 1971 } 1972 next: 1973 BRIDGE_PSZ_RENTER(s); 1974 bridge_release_member(sc, bif, &psref); 1975 } 1976 BRIDGE_PSZ_REXIT(s); 1977 1978 m_freem(m); 1979 } 1980 1981 static int 1982 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1983 struct bridge_rtnode **brtp) 1984 { 1985 struct bridge_rtnode *brt; 1986 int error; 1987 1988 if (sc->sc_brtcnt >= sc->sc_brtmax) 1989 return ENOSPC; 1990 1991 /* 1992 * Allocate a new bridge forwarding node, and 1993 * initialize the expiration time and Ethernet 1994 * address. 1995 */ 1996 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1997 if (brt == NULL) 1998 return ENOMEM; 1999 2000 memset(brt, 0, sizeof(*brt)); 2001 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2002 brt->brt_flags = IFBAF_DYNAMIC; 2003 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2004 2005 BRIDGE_RT_LOCK(sc); 2006 error = bridge_rtnode_insert(sc, brt); 2007 BRIDGE_RT_UNLOCK(sc); 2008 2009 if (error != 0) { 2010 pool_put(&bridge_rtnode_pool, brt); 2011 return error; 2012 } 2013 2014 *brtp = brt; 2015 return 0; 2016 } 2017 2018 /* 2019 * bridge_rtupdate: 2020 * 2021 * Add a bridge routing entry. 2022 */ 2023 static int 2024 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2025 struct ifnet *dst_if, int setflags, uint8_t flags) 2026 { 2027 struct bridge_rtnode *brt; 2028 int s; 2029 2030 again: 2031 /* 2032 * A route for this destination might already exist. If so, 2033 * update it, otherwise create a new one. 2034 */ 2035 BRIDGE_RT_RENTER(s); 2036 brt = bridge_rtnode_lookup(sc, dst); 2037 2038 if (brt != NULL) { 2039 brt->brt_ifp = dst_if; 2040 if (setflags) { 2041 brt->brt_flags = flags; 2042 if (flags & IFBAF_STATIC) 2043 brt->brt_expire = 0; 2044 else 2045 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2046 } else { 2047 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2048 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2049 } 2050 } 2051 BRIDGE_RT_REXIT(s); 2052 2053 if (brt == NULL) { 2054 int r; 2055 2056 r = bridge_rtalloc(sc, dst, &brt); 2057 if (r != 0) 2058 return r; 2059 goto again; 2060 } 2061 2062 return 0; 2063 } 2064 2065 /* 2066 * bridge_rtlookup: 2067 * 2068 * Lookup the destination interface for an address. 2069 */ 2070 static struct ifnet * 2071 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2072 { 2073 struct bridge_rtnode *brt; 2074 struct ifnet *ifs = NULL; 2075 int s; 2076 2077 BRIDGE_RT_RENTER(s); 2078 brt = bridge_rtnode_lookup(sc, addr); 2079 if (brt != NULL) 2080 ifs = brt->brt_ifp; 2081 BRIDGE_RT_REXIT(s); 2082 2083 return ifs; 2084 } 2085 2086 typedef bool (*bridge_iterate_cb_t) 2087 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2088 2089 /* 2090 * bridge_rtlist_iterate_remove: 2091 * 2092 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2093 * callback judges to remove. Removals of rtnodes are done in a manner 2094 * of pserialize. To this end, all kmem_* operations are placed out of 2095 * mutexes. 2096 */ 2097 static void 2098 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2099 { 2100 struct bridge_rtnode *brt, *nbrt; 2101 struct bridge_rtnode **brt_list; 2102 int i, count; 2103 2104 retry: 2105 count = sc->sc_brtcnt; 2106 if (count == 0) 2107 return; 2108 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2109 2110 BRIDGE_RT_LOCK(sc); 2111 if (__predict_false(sc->sc_brtcnt > count)) { 2112 /* The rtnodes increased, we need more memory */ 2113 BRIDGE_RT_UNLOCK(sc); 2114 kmem_free(brt_list, sizeof(*brt_list) * count); 2115 goto retry; 2116 } 2117 2118 i = 0; 2119 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2120 bool need_break = false; 2121 if (func(sc, brt, &need_break, arg)) { 2122 bridge_rtnode_remove(sc, brt); 2123 brt_list[i++] = brt; 2124 } 2125 if (need_break) 2126 break; 2127 } 2128 2129 if (i > 0) 2130 BRIDGE_RT_PSZ_PERFORM(sc); 2131 BRIDGE_RT_UNLOCK(sc); 2132 2133 while (--i >= 0) 2134 bridge_rtnode_destroy(brt_list[i]); 2135 2136 kmem_free(brt_list, sizeof(*brt_list) * count); 2137 } 2138 2139 static bool 2140 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2141 bool *need_break, void *arg) 2142 { 2143 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2144 /* Take into account of the subsequent removal */ 2145 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2146 *need_break = true; 2147 return true; 2148 } else 2149 return false; 2150 } 2151 2152 static void 2153 bridge_rttrim0(struct bridge_softc *sc) 2154 { 2155 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2156 } 2157 2158 /* 2159 * bridge_rttrim: 2160 * 2161 * Trim the routine table so that we have a number 2162 * of routing entries less than or equal to the 2163 * maximum number. 2164 */ 2165 static void 2166 bridge_rttrim(struct bridge_softc *sc) 2167 { 2168 2169 /* Make sure we actually need to do this. */ 2170 if (sc->sc_brtcnt <= sc->sc_brtmax) 2171 return; 2172 2173 /* Force an aging cycle; this might trim enough addresses. */ 2174 bridge_rtage(sc); 2175 if (sc->sc_brtcnt <= sc->sc_brtmax) 2176 return; 2177 2178 bridge_rttrim0(sc); 2179 2180 return; 2181 } 2182 2183 /* 2184 * bridge_timer: 2185 * 2186 * Aging timer for the bridge. 2187 */ 2188 static void 2189 bridge_timer(void *arg) 2190 { 2191 struct bridge_softc *sc = arg; 2192 2193 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2194 } 2195 2196 static void 2197 bridge_rtage_work(struct work *wk, void *arg) 2198 { 2199 struct bridge_softc *sc = arg; 2200 2201 KASSERT(wk == &sc->sc_rtage_wk); 2202 2203 bridge_rtage(sc); 2204 2205 if (sc->sc_if.if_flags & IFF_RUNNING) 2206 callout_reset(&sc->sc_brcallout, 2207 bridge_rtable_prune_period * hz, bridge_timer, sc); 2208 } 2209 2210 static bool 2211 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2212 bool *need_break, void *arg) 2213 { 2214 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2215 time_uptime >= brt->brt_expire) 2216 return true; 2217 else 2218 return false; 2219 } 2220 2221 /* 2222 * bridge_rtage: 2223 * 2224 * Perform an aging cycle. 2225 */ 2226 static void 2227 bridge_rtage(struct bridge_softc *sc) 2228 { 2229 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2230 } 2231 2232 2233 static bool 2234 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2235 bool *need_break, void *arg) 2236 { 2237 int full = *(int*)arg; 2238 2239 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2240 return true; 2241 else 2242 return false; 2243 } 2244 2245 /* 2246 * bridge_rtflush: 2247 * 2248 * Remove all dynamic addresses from the bridge. 2249 */ 2250 static void 2251 bridge_rtflush(struct bridge_softc *sc, int full) 2252 { 2253 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2254 } 2255 2256 /* 2257 * bridge_rtdaddr: 2258 * 2259 * Remove an address from the table. 2260 */ 2261 static int 2262 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2263 { 2264 struct bridge_rtnode *brt; 2265 2266 BRIDGE_RT_LOCK(sc); 2267 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2268 BRIDGE_RT_UNLOCK(sc); 2269 return ENOENT; 2270 } 2271 bridge_rtnode_remove(sc, brt); 2272 BRIDGE_RT_PSZ_PERFORM(sc); 2273 BRIDGE_RT_UNLOCK(sc); 2274 2275 bridge_rtnode_destroy(brt); 2276 2277 return 0; 2278 } 2279 2280 /* 2281 * bridge_rtdelete: 2282 * 2283 * Delete routes to a speicifc member interface. 2284 */ 2285 static void 2286 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2287 { 2288 struct bridge_rtnode *brt; 2289 2290 BRIDGE_RT_LOCK(sc); 2291 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2292 if (brt->brt_ifp == ifp) 2293 break; 2294 } 2295 if (brt == NULL) { 2296 BRIDGE_RT_UNLOCK(sc); 2297 return; 2298 } 2299 bridge_rtnode_remove(sc, brt); 2300 BRIDGE_RT_PSZ_PERFORM(sc); 2301 BRIDGE_RT_UNLOCK(sc); 2302 2303 bridge_rtnode_destroy(brt); 2304 } 2305 2306 /* 2307 * bridge_rtable_init: 2308 * 2309 * Initialize the route table for this bridge. 2310 */ 2311 static void 2312 bridge_rtable_init(struct bridge_softc *sc) 2313 { 2314 int i; 2315 2316 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2317 KM_SLEEP); 2318 2319 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2320 LIST_INIT(&sc->sc_rthash[i]); 2321 2322 sc->sc_rthash_key = cprng_fast32(); 2323 2324 LIST_INIT(&sc->sc_rtlist); 2325 2326 sc->sc_rtlist_psz = pserialize_create(); 2327 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2328 } 2329 2330 /* 2331 * bridge_rtable_fini: 2332 * 2333 * Deconstruct the route table for this bridge. 2334 */ 2335 static void 2336 bridge_rtable_fini(struct bridge_softc *sc) 2337 { 2338 2339 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2340 if (sc->sc_rtlist_lock) 2341 mutex_obj_free(sc->sc_rtlist_lock); 2342 if (sc->sc_rtlist_psz) 2343 pserialize_destroy(sc->sc_rtlist_psz); 2344 } 2345 2346 /* 2347 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2348 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2349 */ 2350 #define mix(a, b, c) \ 2351 do { \ 2352 a -= b; a -= c; a ^= (c >> 13); \ 2353 b -= c; b -= a; b ^= (a << 8); \ 2354 c -= a; c -= b; c ^= (b >> 13); \ 2355 a -= b; a -= c; a ^= (c >> 12); \ 2356 b -= c; b -= a; b ^= (a << 16); \ 2357 c -= a; c -= b; c ^= (b >> 5); \ 2358 a -= b; a -= c; a ^= (c >> 3); \ 2359 b -= c; b -= a; b ^= (a << 10); \ 2360 c -= a; c -= b; c ^= (b >> 15); \ 2361 } while (/*CONSTCOND*/0) 2362 2363 static inline uint32_t 2364 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2365 { 2366 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2367 2368 b += addr[5] << 8; 2369 b += addr[4]; 2370 a += addr[3] << 24; 2371 a += addr[2] << 16; 2372 a += addr[1] << 8; 2373 a += addr[0]; 2374 2375 mix(a, b, c); 2376 2377 return (c & BRIDGE_RTHASH_MASK); 2378 } 2379 2380 #undef mix 2381 2382 /* 2383 * bridge_rtnode_lookup: 2384 * 2385 * Look up a bridge route node for the specified destination. 2386 */ 2387 static struct bridge_rtnode * 2388 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2389 { 2390 struct bridge_rtnode *brt; 2391 uint32_t hash; 2392 int dir; 2393 2394 hash = bridge_rthash(sc, addr); 2395 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2396 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2397 if (dir == 0) 2398 return (brt); 2399 if (dir > 0) 2400 return (NULL); 2401 } 2402 2403 return (NULL); 2404 } 2405 2406 /* 2407 * bridge_rtnode_insert: 2408 * 2409 * Insert the specified bridge node into the route table. We 2410 * assume the entry is not already in the table. 2411 */ 2412 static int 2413 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2414 { 2415 struct bridge_rtnode *lbrt; 2416 uint32_t hash; 2417 int dir; 2418 2419 KASSERT(BRIDGE_RT_LOCKED(sc)); 2420 2421 hash = bridge_rthash(sc, brt->brt_addr); 2422 2423 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2424 if (lbrt == NULL) { 2425 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2426 goto out; 2427 } 2428 2429 do { 2430 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2431 if (dir == 0) 2432 return (EEXIST); 2433 if (dir > 0) { 2434 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2435 goto out; 2436 } 2437 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2438 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2439 goto out; 2440 } 2441 lbrt = LIST_NEXT(lbrt, brt_hash); 2442 } while (lbrt != NULL); 2443 2444 #ifdef DIAGNOSTIC 2445 panic("bridge_rtnode_insert: impossible"); 2446 #endif 2447 2448 out: 2449 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2450 sc->sc_brtcnt++; 2451 2452 return (0); 2453 } 2454 2455 /* 2456 * bridge_rtnode_remove: 2457 * 2458 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2459 */ 2460 static void 2461 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2462 { 2463 2464 KASSERT(BRIDGE_RT_LOCKED(sc)); 2465 2466 LIST_REMOVE(brt, brt_hash); 2467 LIST_REMOVE(brt, brt_list); 2468 sc->sc_brtcnt--; 2469 } 2470 2471 /* 2472 * bridge_rtnode_destroy: 2473 * 2474 * Destroy a bridge rtnode. 2475 */ 2476 static void 2477 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2478 { 2479 2480 pool_put(&bridge_rtnode_pool, brt); 2481 } 2482 2483 #if defined(BRIDGE_IPF) 2484 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2485 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2486 2487 /* 2488 * Send bridge packets through IPF if they are one of the types IPF can deal 2489 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2490 * question.) 2491 */ 2492 static int 2493 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2494 { 2495 int snap, error; 2496 struct ether_header *eh1, eh2; 2497 struct llc llc1; 2498 uint16_t ether_type; 2499 2500 snap = 0; 2501 error = -1; /* Default error if not error == 0 */ 2502 eh1 = mtod(*mp, struct ether_header *); 2503 ether_type = ntohs(eh1->ether_type); 2504 2505 /* 2506 * Check for SNAP/LLC. 2507 */ 2508 if (ether_type < ETHERMTU) { 2509 struct llc *llc2 = (struct llc *)(eh1 + 1); 2510 2511 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2512 llc2->llc_dsap == LLC_SNAP_LSAP && 2513 llc2->llc_ssap == LLC_SNAP_LSAP && 2514 llc2->llc_control == LLC_UI) { 2515 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2516 snap = 1; 2517 } 2518 } 2519 2520 /* 2521 * If we're trying to filter bridge traffic, don't look at anything 2522 * other than IP and ARP traffic. If the filter doesn't understand 2523 * IPv6, don't allow IPv6 through the bridge either. This is lame 2524 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2525 * but of course we don't have an AppleTalk filter to begin with. 2526 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2527 * ARP traffic.) 2528 */ 2529 switch (ether_type) { 2530 case ETHERTYPE_ARP: 2531 case ETHERTYPE_REVARP: 2532 return 0; /* Automatically pass */ 2533 case ETHERTYPE_IP: 2534 # ifdef INET6 2535 case ETHERTYPE_IPV6: 2536 # endif /* INET6 */ 2537 break; 2538 default: 2539 goto bad; 2540 } 2541 2542 /* Strip off the Ethernet header and keep a copy. */ 2543 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2544 m_adj(*mp, ETHER_HDR_LEN); 2545 2546 /* Strip off snap header, if present */ 2547 if (snap) { 2548 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2549 m_adj(*mp, sizeof(struct llc)); 2550 } 2551 2552 /* 2553 * Check basic packet sanity and run IPF through pfil. 2554 */ 2555 KASSERT(!cpu_intr_p()); 2556 switch (ether_type) 2557 { 2558 case ETHERTYPE_IP : 2559 error = bridge_ip_checkbasic(mp); 2560 if (error == 0) 2561 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2562 break; 2563 # ifdef INET6 2564 case ETHERTYPE_IPV6 : 2565 error = bridge_ip6_checkbasic(mp); 2566 if (error == 0) 2567 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2568 break; 2569 # endif 2570 default : 2571 error = 0; 2572 break; 2573 } 2574 2575 if (*mp == NULL) 2576 return error; 2577 if (error != 0) 2578 goto bad; 2579 2580 error = -1; 2581 2582 /* 2583 * Finally, put everything back the way it was and return 2584 */ 2585 if (snap) { 2586 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2587 if (*mp == NULL) 2588 return error; 2589 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2590 } 2591 2592 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2593 if (*mp == NULL) 2594 return error; 2595 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2596 2597 return 0; 2598 2599 bad: 2600 m_freem(*mp); 2601 *mp = NULL; 2602 return error; 2603 } 2604 2605 /* 2606 * Perform basic checks on header size since 2607 * IPF assumes ip_input has already processed 2608 * it for it. Cut-and-pasted from ip_input.c. 2609 * Given how simple the IPv6 version is, 2610 * does the IPv4 version really need to be 2611 * this complicated? 2612 * 2613 * XXX Should we update ipstat here, or not? 2614 * XXX Right now we update ipstat but not 2615 * XXX csum_counter. 2616 */ 2617 static int 2618 bridge_ip_checkbasic(struct mbuf **mp) 2619 { 2620 struct mbuf *m = *mp; 2621 struct ip *ip; 2622 int len, hlen; 2623 2624 if (*mp == NULL) 2625 return -1; 2626 2627 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2628 if ((m = m_copyup(m, sizeof(struct ip), 2629 (max_linkhdr + 3) & ~3)) == NULL) { 2630 /* XXXJRT new stat, please */ 2631 ip_statinc(IP_STAT_TOOSMALL); 2632 goto bad; 2633 } 2634 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2635 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2636 ip_statinc(IP_STAT_TOOSMALL); 2637 goto bad; 2638 } 2639 } 2640 ip = mtod(m, struct ip *); 2641 if (ip == NULL) goto bad; 2642 2643 if (ip->ip_v != IPVERSION) { 2644 ip_statinc(IP_STAT_BADVERS); 2645 goto bad; 2646 } 2647 hlen = ip->ip_hl << 2; 2648 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2649 ip_statinc(IP_STAT_BADHLEN); 2650 goto bad; 2651 } 2652 if (hlen > m->m_len) { 2653 if ((m = m_pullup(m, hlen)) == 0) { 2654 ip_statinc(IP_STAT_BADHLEN); 2655 goto bad; 2656 } 2657 ip = mtod(m, struct ip *); 2658 if (ip == NULL) goto bad; 2659 } 2660 2661 switch (m->m_pkthdr.csum_flags & 2662 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2663 M_CSUM_IPv4_BAD)) { 2664 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2665 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2666 goto bad; 2667 2668 case M_CSUM_IPv4: 2669 /* Checksum was okay. */ 2670 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2671 break; 2672 2673 default: 2674 /* Must compute it ourselves. */ 2675 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2676 if (in_cksum(m, hlen) != 0) 2677 goto bad; 2678 break; 2679 } 2680 2681 /* Retrieve the packet length. */ 2682 len = ntohs(ip->ip_len); 2683 2684 /* 2685 * Check for additional length bogosity 2686 */ 2687 if (len < hlen) { 2688 ip_statinc(IP_STAT_BADLEN); 2689 goto bad; 2690 } 2691 2692 /* 2693 * Check that the amount of data in the buffers 2694 * is as at least much as the IP header would have us expect. 2695 * Drop packet if shorter than we expect. 2696 */ 2697 if (m->m_pkthdr.len < len) { 2698 ip_statinc(IP_STAT_TOOSHORT); 2699 goto bad; 2700 } 2701 2702 /* Checks out, proceed */ 2703 *mp = m; 2704 return 0; 2705 2706 bad: 2707 *mp = m; 2708 return -1; 2709 } 2710 2711 # ifdef INET6 2712 /* 2713 * Same as above, but for IPv6. 2714 * Cut-and-pasted from ip6_input.c. 2715 * XXX Should we update ip6stat, or not? 2716 */ 2717 static int 2718 bridge_ip6_checkbasic(struct mbuf **mp) 2719 { 2720 struct mbuf *m = *mp; 2721 struct ip6_hdr *ip6; 2722 2723 /* 2724 * If the IPv6 header is not aligned, slurp it up into a new 2725 * mbuf with space for link headers, in the event we forward 2726 * it. Otherwise, if it is aligned, make sure the entire base 2727 * IPv6 header is in the first mbuf of the chain. 2728 */ 2729 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2730 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2731 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2732 (max_linkhdr + 3) & ~3)) == NULL) { 2733 /* XXXJRT new stat, please */ 2734 ip6_statinc(IP6_STAT_TOOSMALL); 2735 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2736 goto bad; 2737 } 2738 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2739 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2740 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2741 ip6_statinc(IP6_STAT_TOOSMALL); 2742 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2743 goto bad; 2744 } 2745 } 2746 2747 ip6 = mtod(m, struct ip6_hdr *); 2748 2749 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2750 ip6_statinc(IP6_STAT_BADVERS); 2751 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2752 goto bad; 2753 } 2754 2755 /* Checks out, proceed */ 2756 *mp = m; 2757 return 0; 2758 2759 bad: 2760 *mp = m; 2761 return -1; 2762 } 2763 # endif /* INET6 */ 2764 #endif /* BRIDGE_IPF */ 2765
Indexes created Thu Oct 02 14:10:14 GMT 2025