if_bridge.c revision 1.122
1 /* $NetBSD: if_bridge.c,v 1.122 2016/05/04 18:59:55 roy 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 1.122 2016/05/04 18:59:55 roy 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_mtu = ETHERMTU; 428 ifp->if_ioctl = bridge_ioctl; 429 ifp->if_output = bridge_output; 430 ifp->if_start = bridge_start; 431 ifp->if_stop = bridge_stop; 432 ifp->if_init = bridge_init; 433 ifp->if_type = IFT_BRIDGE; 434 ifp->if_addrlen = 0; 435 ifp->if_dlt = DLT_EN10MB; 436 ifp->if_hdrlen = ETHER_HDR_LEN; 437 438 if_initialize(ifp); 439 if_register(ifp); 440 441 if_alloc_sadl(ifp); 442 443 return (0); 444 } 445 446 /* 447 * bridge_clone_destroy: 448 * 449 * Destroy a bridge instance. 450 */ 451 static int 452 bridge_clone_destroy(struct ifnet *ifp) 453 { 454 struct bridge_softc *sc = ifp->if_softc; 455 struct bridge_iflist *bif; 456 int s; 457 458 s = splnet(); 459 460 bridge_stop(ifp, 1); 461 462 BRIDGE_LOCK(sc); 463 for (;;) { 464 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 465 bif_next); 466 if (bif == NULL) 467 break; 468 bridge_delete_member(sc, bif); 469 } 470 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 471 BRIDGE_UNLOCK(sc); 472 473 splx(s); 474 475 if_detach(ifp); 476 477 /* Tear down the routing table. */ 478 bridge_rtable_fini(sc); 479 480 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 481 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 482 483 workqueue_destroy(sc->sc_rtage_wq); 484 485 kmem_free(sc, sizeof(*sc)); 486 487 return (0); 488 } 489 490 /* 491 * bridge_ioctl: 492 * 493 * Handle a control request from the operator. 494 */ 495 static int 496 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 497 { 498 struct bridge_softc *sc = ifp->if_softc; 499 struct lwp *l = curlwp; /* XXX */ 500 union { 501 struct ifbreq ifbreq; 502 struct ifbifconf ifbifconf; 503 struct ifbareq ifbareq; 504 struct ifbaconf ifbaconf; 505 struct ifbrparam ifbrparam; 506 } args; 507 struct ifdrv *ifd = (struct ifdrv *) data; 508 const struct bridge_control *bc = NULL; /* XXXGCC */ 509 int s, error = 0; 510 511 /* Authorize command before calling splnet(). */ 512 switch (cmd) { 513 case SIOCGDRVSPEC: 514 case SIOCSDRVSPEC: 515 if (ifd->ifd_cmd >= bridge_control_table_size 516 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 517 error = EINVAL; 518 return error; 519 } 520 521 /* We only care about BC_F_SUSER at this point. */ 522 if ((bc->bc_flags & BC_F_SUSER) == 0) 523 break; 524 525 error = kauth_authorize_network(l->l_cred, 526 KAUTH_NETWORK_INTERFACE_BRIDGE, 527 cmd == SIOCGDRVSPEC ? 528 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 529 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 530 ifd, NULL, NULL); 531 if (error) 532 return (error); 533 534 break; 535 } 536 537 s = splnet(); 538 539 switch (cmd) { 540 case SIOCGDRVSPEC: 541 case SIOCSDRVSPEC: 542 KASSERT(bc != NULL); 543 if (cmd == SIOCGDRVSPEC && 544 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 545 error = EINVAL; 546 break; 547 } 548 else if (cmd == SIOCSDRVSPEC && 549 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 550 error = EINVAL; 551 break; 552 } 553 554 /* BC_F_SUSER is checked above, before splnet(). */ 555 556 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 557 && (ifd->ifd_len != bc->bc_argsize 558 || ifd->ifd_len > sizeof(args))) { 559 error = EINVAL; 560 break; 561 } 562 563 memset(&args, 0, sizeof(args)); 564 if (bc->bc_flags & BC_F_COPYIN) { 565 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 566 if (error) 567 break; 568 } else if (bc->bc_flags & BC_F_XLATEIN) { 569 args.ifbifconf.ifbic_len = ifd->ifd_len; 570 args.ifbifconf.ifbic_buf = ifd->ifd_data; 571 } 572 573 error = (*bc->bc_func)(sc, &args); 574 if (error) 575 break; 576 577 if (bc->bc_flags & BC_F_COPYOUT) { 578 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 579 } else if (bc->bc_flags & BC_F_XLATEOUT) { 580 ifd->ifd_len = args.ifbifconf.ifbic_len; 581 ifd->ifd_data = args.ifbifconf.ifbic_buf; 582 } 583 break; 584 585 case SIOCSIFFLAGS: 586 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 587 break; 588 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 589 case IFF_RUNNING: 590 /* 591 * If interface is marked down and it is running, 592 * then stop and disable it. 593 */ 594 (*ifp->if_stop)(ifp, 1); 595 break; 596 case IFF_UP: 597 /* 598 * If interface is marked up and it is stopped, then 599 * start it. 600 */ 601 error = (*ifp->if_init)(ifp); 602 break; 603 default: 604 break; 605 } 606 break; 607 608 case SIOCSIFMTU: 609 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 610 error = 0; 611 break; 612 613 default: 614 error = ifioctl_common(ifp, cmd, data); 615 break; 616 } 617 618 splx(s); 619 620 return (error); 621 } 622 623 /* 624 * bridge_lookup_member: 625 * 626 * Lookup a bridge member interface. 627 */ 628 static struct bridge_iflist * 629 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 630 { 631 struct bridge_iflist *bif; 632 struct ifnet *ifp; 633 int s; 634 635 BRIDGE_PSZ_RENTER(s); 636 637 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 638 ifp = bif->bif_ifp; 639 if (strcmp(ifp->if_xname, name) == 0) 640 break; 641 } 642 if (bif != NULL) 643 bridge_acquire_member(sc, bif, psref); 644 645 BRIDGE_PSZ_REXIT(s); 646 647 return bif; 648 } 649 650 /* 651 * bridge_lookup_member_if: 652 * 653 * Lookup a bridge member interface by ifnet*. 654 */ 655 static struct bridge_iflist * 656 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 657 struct psref *psref) 658 { 659 struct bridge_iflist *bif; 660 int s; 661 662 BRIDGE_PSZ_RENTER(s); 663 664 bif = member_ifp->if_bridgeif; 665 if (bif != NULL) { 666 psref_acquire(psref, &bif->bif_psref, 667 bridge_psref_class); 668 } 669 670 BRIDGE_PSZ_REXIT(s); 671 672 return bif; 673 } 674 675 static void 676 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 677 struct psref *psref) 678 { 679 680 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 681 } 682 683 /* 684 * bridge_release_member: 685 * 686 * Release the specified member interface. 687 */ 688 static void 689 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 690 struct psref *psref) 691 { 692 693 psref_release(psref, &bif->bif_psref, bridge_psref_class); 694 } 695 696 /* 697 * bridge_delete_member: 698 * 699 * Delete the specified member interface. 700 */ 701 static void 702 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 703 { 704 struct ifnet *ifs = bif->bif_ifp; 705 706 KASSERT(BRIDGE_LOCKED(sc)); 707 708 ifs->_if_input = ether_input; 709 ifs->if_bridge = NULL; 710 ifs->if_bridgeif = NULL; 711 712 PSLIST_WRITER_REMOVE(bif, bif_next); 713 BRIDGE_PSZ_PERFORM(sc); 714 BRIDGE_UNLOCK(sc); 715 716 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 717 718 PSLIST_ENTRY_DESTROY(bif, bif_next); 719 kmem_free(bif, sizeof(*bif)); 720 721 BRIDGE_LOCK(sc); 722 } 723 724 static int 725 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 726 { 727 struct ifbreq *req = arg; 728 struct bridge_iflist *bif = NULL; 729 struct ifnet *ifs; 730 int error = 0; 731 732 ifs = ifunit(req->ifbr_ifsname); 733 if (ifs == NULL) 734 return (ENOENT); 735 736 if (sc->sc_if.if_mtu != ifs->if_mtu) 737 return (EINVAL); 738 739 if (ifs->if_bridge == sc) 740 return (EEXIST); 741 742 if (ifs->if_bridge != NULL) 743 return (EBUSY); 744 745 if (ifs->_if_input != ether_input) 746 return EINVAL; 747 748 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 749 if ((ifs->if_flags & IFF_SIMPLEX) == 0) 750 return EINVAL; 751 752 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 753 754 switch (ifs->if_type) { 755 case IFT_ETHER: 756 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 757 goto out; 758 /* 759 * Place the interface into promiscuous mode. 760 */ 761 error = ifpromisc(ifs, 1); 762 if (error) 763 goto out; 764 break; 765 default: 766 error = EINVAL; 767 goto out; 768 } 769 770 bif->bif_ifp = ifs; 771 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 772 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 773 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 774 PSLIST_ENTRY_INIT(bif, bif_next); 775 psref_target_init(&bif->bif_psref, bridge_psref_class); 776 777 BRIDGE_LOCK(sc); 778 779 ifs->if_bridge = sc; 780 ifs->if_bridgeif = bif; 781 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 782 ifs->_if_input = bridge_input; 783 784 BRIDGE_UNLOCK(sc); 785 786 if (sc->sc_if.if_flags & IFF_RUNNING) 787 bstp_initialization(sc); 788 else 789 bstp_stop(sc); 790 791 out: 792 if (error) { 793 if (bif != NULL) 794 kmem_free(bif, sizeof(*bif)); 795 } 796 return (error); 797 } 798 799 static int 800 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 801 { 802 struct ifbreq *req = arg; 803 const char *name = req->ifbr_ifsname; 804 struct bridge_iflist *bif; 805 struct ifnet *ifs; 806 807 BRIDGE_LOCK(sc); 808 809 /* 810 * Don't use bridge_lookup_member. We want to get a member 811 * with bif_refs == 0. 812 */ 813 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 814 ifs = bif->bif_ifp; 815 if (strcmp(ifs->if_xname, name) == 0) 816 break; 817 } 818 819 if (bif == NULL) { 820 BRIDGE_UNLOCK(sc); 821 return ENOENT; 822 } 823 824 bridge_delete_member(sc, bif); 825 826 BRIDGE_UNLOCK(sc); 827 828 switch (ifs->if_type) { 829 case IFT_ETHER: 830 /* 831 * Take the interface out of promiscuous mode. 832 * Don't call it with holding a spin lock. 833 */ 834 (void) ifpromisc(ifs, 0); 835 (void) ether_disable_vlan_mtu(ifs); 836 break; 837 default: 838 #ifdef DIAGNOSTIC 839 panic("bridge_delete_member: impossible"); 840 #endif 841 break; 842 } 843 844 bridge_rtdelete(sc, ifs); 845 846 if (sc->sc_if.if_flags & IFF_RUNNING) 847 bstp_initialization(sc); 848 849 return 0; 850 } 851 852 static int 853 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 854 { 855 struct ifbreq *req = arg; 856 struct bridge_iflist *bif; 857 struct psref psref; 858 859 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 860 if (bif == NULL) 861 return (ENOENT); 862 863 req->ifbr_ifsflags = bif->bif_flags; 864 req->ifbr_state = bif->bif_state; 865 req->ifbr_priority = bif->bif_priority; 866 req->ifbr_path_cost = bif->bif_path_cost; 867 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 868 869 bridge_release_member(sc, bif, &psref); 870 871 return (0); 872 } 873 874 static int 875 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 876 { 877 struct ifbreq *req = arg; 878 struct bridge_iflist *bif; 879 struct psref psref; 880 881 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 882 if (bif == NULL) 883 return (ENOENT); 884 885 if (req->ifbr_ifsflags & IFBIF_STP) { 886 switch (bif->bif_ifp->if_type) { 887 case IFT_ETHER: 888 /* These can do spanning tree. */ 889 break; 890 891 default: 892 /* Nothing else can. */ 893 bridge_release_member(sc, bif, &psref); 894 return (EINVAL); 895 } 896 } 897 898 bif->bif_flags = req->ifbr_ifsflags; 899 900 bridge_release_member(sc, bif, &psref); 901 902 if (sc->sc_if.if_flags & IFF_RUNNING) 903 bstp_initialization(sc); 904 905 return (0); 906 } 907 908 static int 909 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 910 { 911 struct ifbrparam *param = arg; 912 913 sc->sc_brtmax = param->ifbrp_csize; 914 bridge_rttrim(sc); 915 916 return (0); 917 } 918 919 static int 920 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 921 { 922 struct ifbrparam *param = arg; 923 924 param->ifbrp_csize = sc->sc_brtmax; 925 926 return (0); 927 } 928 929 static int 930 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 931 { 932 struct ifbifconf *bifc = arg; 933 struct bridge_iflist *bif; 934 struct ifbreq *breqs; 935 int i, count, error = 0; 936 937 retry: 938 BRIDGE_LOCK(sc); 939 count = 0; 940 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 941 count++; 942 BRIDGE_UNLOCK(sc); 943 944 if (count == 0) { 945 bifc->ifbic_len = 0; 946 return 0; 947 } 948 949 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 950 /* Tell that a larger buffer is needed */ 951 bifc->ifbic_len = sizeof(*breqs) * count; 952 return 0; 953 } 954 955 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 956 957 BRIDGE_LOCK(sc); 958 959 i = 0; 960 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 961 i++; 962 if (i > count) { 963 /* 964 * The number of members has been increased. 965 * We need more memory! 966 */ 967 BRIDGE_UNLOCK(sc); 968 kmem_free(breqs, sizeof(*breqs) * count); 969 goto retry; 970 } 971 972 i = 0; 973 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 974 struct ifbreq *breq = &breqs[i++]; 975 memset(breq, 0, sizeof(*breq)); 976 977 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 978 sizeof(breq->ifbr_ifsname)); 979 breq->ifbr_ifsflags = bif->bif_flags; 980 breq->ifbr_state = bif->bif_state; 981 breq->ifbr_priority = bif->bif_priority; 982 breq->ifbr_path_cost = bif->bif_path_cost; 983 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 984 } 985 986 /* Don't call copyout with holding the mutex */ 987 BRIDGE_UNLOCK(sc); 988 989 for (i = 0; i < count; i++) { 990 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 991 if (error) 992 break; 993 } 994 bifc->ifbic_len = sizeof(*breqs) * i; 995 996 kmem_free(breqs, sizeof(*breqs) * count); 997 998 return error; 999 } 1000 1001 static int 1002 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1003 { 1004 struct ifbaconf *bac = arg; 1005 struct bridge_rtnode *brt; 1006 struct ifbareq bareq; 1007 int count = 0, error = 0, len; 1008 1009 if (bac->ifbac_len == 0) 1010 return (0); 1011 1012 BRIDGE_RT_LOCK(sc); 1013 1014 len = bac->ifbac_len; 1015 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1016 if (len < sizeof(bareq)) 1017 goto out; 1018 memset(&bareq, 0, sizeof(bareq)); 1019 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1020 sizeof(bareq.ifba_ifsname)); 1021 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1022 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1023 bareq.ifba_expire = brt->brt_expire - time_uptime; 1024 } else 1025 bareq.ifba_expire = 0; 1026 bareq.ifba_flags = brt->brt_flags; 1027 1028 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1029 if (error) 1030 goto out; 1031 count++; 1032 len -= sizeof(bareq); 1033 } 1034 out: 1035 BRIDGE_RT_UNLOCK(sc); 1036 1037 bac->ifbac_len = sizeof(bareq) * count; 1038 return (error); 1039 } 1040 1041 static int 1042 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1043 { 1044 struct ifbareq *req = arg; 1045 struct bridge_iflist *bif; 1046 int error; 1047 struct psref psref; 1048 1049 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1050 if (bif == NULL) 1051 return (ENOENT); 1052 1053 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1054 req->ifba_flags); 1055 1056 bridge_release_member(sc, bif, &psref); 1057 1058 return (error); 1059 } 1060 1061 static int 1062 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1063 { 1064 struct ifbrparam *param = arg; 1065 1066 sc->sc_brttimeout = param->ifbrp_ctime; 1067 1068 return (0); 1069 } 1070 1071 static int 1072 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1073 { 1074 struct ifbrparam *param = arg; 1075 1076 param->ifbrp_ctime = sc->sc_brttimeout; 1077 1078 return (0); 1079 } 1080 1081 static int 1082 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1083 { 1084 struct ifbareq *req = arg; 1085 1086 return (bridge_rtdaddr(sc, req->ifba_dst)); 1087 } 1088 1089 static int 1090 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1091 { 1092 struct ifbreq *req = arg; 1093 1094 bridge_rtflush(sc, req->ifbr_ifsflags); 1095 1096 return (0); 1097 } 1098 1099 static int 1100 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1101 { 1102 struct ifbrparam *param = arg; 1103 1104 param->ifbrp_prio = sc->sc_bridge_priority; 1105 1106 return (0); 1107 } 1108 1109 static int 1110 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1111 { 1112 struct ifbrparam *param = arg; 1113 1114 sc->sc_bridge_priority = param->ifbrp_prio; 1115 1116 if (sc->sc_if.if_flags & IFF_RUNNING) 1117 bstp_initialization(sc); 1118 1119 return (0); 1120 } 1121 1122 static int 1123 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1124 { 1125 struct ifbrparam *param = arg; 1126 1127 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1128 1129 return (0); 1130 } 1131 1132 static int 1133 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1134 { 1135 struct ifbrparam *param = arg; 1136 1137 if (param->ifbrp_hellotime == 0) 1138 return (EINVAL); 1139 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1140 1141 if (sc->sc_if.if_flags & IFF_RUNNING) 1142 bstp_initialization(sc); 1143 1144 return (0); 1145 } 1146 1147 static int 1148 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1149 { 1150 struct ifbrparam *param = arg; 1151 1152 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1153 1154 return (0); 1155 } 1156 1157 static int 1158 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1159 { 1160 struct ifbrparam *param = arg; 1161 1162 if (param->ifbrp_fwddelay == 0) 1163 return (EINVAL); 1164 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1165 1166 if (sc->sc_if.if_flags & IFF_RUNNING) 1167 bstp_initialization(sc); 1168 1169 return (0); 1170 } 1171 1172 static int 1173 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbrparam *param = arg; 1176 1177 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1178 1179 return (0); 1180 } 1181 1182 static int 1183 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1184 { 1185 struct ifbrparam *param = arg; 1186 1187 if (param->ifbrp_maxage == 0) 1188 return (EINVAL); 1189 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1190 1191 if (sc->sc_if.if_flags & IFF_RUNNING) 1192 bstp_initialization(sc); 1193 1194 return (0); 1195 } 1196 1197 static int 1198 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1199 { 1200 struct ifbreq *req = arg; 1201 struct bridge_iflist *bif; 1202 struct psref psref; 1203 1204 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1205 if (bif == NULL) 1206 return (ENOENT); 1207 1208 bif->bif_priority = req->ifbr_priority; 1209 1210 if (sc->sc_if.if_flags & IFF_RUNNING) 1211 bstp_initialization(sc); 1212 1213 bridge_release_member(sc, bif, &psref); 1214 1215 return (0); 1216 } 1217 1218 #if defined(BRIDGE_IPF) 1219 static int 1220 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1221 { 1222 struct ifbrparam *param = arg; 1223 1224 param->ifbrp_filter = sc->sc_filter_flags; 1225 1226 return (0); 1227 } 1228 1229 static int 1230 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1231 { 1232 struct ifbrparam *param = arg; 1233 uint32_t nflags, oflags; 1234 1235 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1236 return (EINVAL); 1237 1238 nflags = param->ifbrp_filter; 1239 oflags = sc->sc_filter_flags; 1240 1241 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1242 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1243 sc->sc_if.if_pfil); 1244 } 1245 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1246 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1247 sc->sc_if.if_pfil); 1248 } 1249 1250 sc->sc_filter_flags = nflags; 1251 1252 return (0); 1253 } 1254 #endif /* BRIDGE_IPF */ 1255 1256 static int 1257 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1258 { 1259 struct ifbreq *req = arg; 1260 struct bridge_iflist *bif; 1261 struct psref psref; 1262 1263 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1264 if (bif == NULL) 1265 return (ENOENT); 1266 1267 bif->bif_path_cost = req->ifbr_path_cost; 1268 1269 if (sc->sc_if.if_flags & IFF_RUNNING) 1270 bstp_initialization(sc); 1271 1272 bridge_release_member(sc, bif, &psref); 1273 1274 return (0); 1275 } 1276 1277 /* 1278 * bridge_ifdetach: 1279 * 1280 * Detach an interface from a bridge. Called when a member 1281 * interface is detaching. 1282 */ 1283 void 1284 bridge_ifdetach(struct ifnet *ifp) 1285 { 1286 struct bridge_softc *sc = ifp->if_bridge; 1287 struct ifbreq breq; 1288 1289 /* ioctl_lock should prevent this from happening */ 1290 KASSERT(sc != NULL); 1291 1292 memset(&breq, 0, sizeof(breq)); 1293 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1294 1295 (void) bridge_ioctl_del(sc, &breq); 1296 } 1297 1298 /* 1299 * bridge_init: 1300 * 1301 * Initialize a bridge interface. 1302 */ 1303 static int 1304 bridge_init(struct ifnet *ifp) 1305 { 1306 struct bridge_softc *sc = ifp->if_softc; 1307 1308 if (ifp->if_flags & IFF_RUNNING) 1309 return (0); 1310 1311 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1312 bridge_timer, sc); 1313 1314 ifp->if_flags |= IFF_RUNNING; 1315 bstp_initialization(sc); 1316 return (0); 1317 } 1318 1319 /* 1320 * bridge_stop: 1321 * 1322 * Stop the bridge interface. 1323 */ 1324 static void 1325 bridge_stop(struct ifnet *ifp, int disable) 1326 { 1327 struct bridge_softc *sc = ifp->if_softc; 1328 1329 if ((ifp->if_flags & IFF_RUNNING) == 0) 1330 return; 1331 1332 callout_stop(&sc->sc_brcallout); 1333 bstp_stop(sc); 1334 1335 bridge_rtflush(sc, IFBF_FLUSHDYN); 1336 1337 ifp->if_flags &= ~IFF_RUNNING; 1338 } 1339 1340 /* 1341 * bridge_enqueue: 1342 * 1343 * Enqueue a packet on a bridge member interface. 1344 */ 1345 void 1346 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1347 int runfilt) 1348 { 1349 int len, error; 1350 short mflags; 1351 1352 /* 1353 * Clear any in-bound checksum flags for this packet. 1354 */ 1355 m->m_pkthdr.csum_flags = 0; 1356 1357 if (runfilt) { 1358 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1359 dst_ifp, PFIL_OUT) != 0) { 1360 if (m != NULL) 1361 m_freem(m); 1362 return; 1363 } 1364 if (m == NULL) 1365 return; 1366 } 1367 1368 #ifdef ALTQ 1369 /* 1370 * If ALTQ is enabled on the member interface, do 1371 * classification; the queueing discipline might 1372 * not require classification, but might require 1373 * the address family/header pointer in the pktattr. 1374 */ 1375 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1376 /* XXX IFT_ETHER */ 1377 altq_etherclassify(&dst_ifp->if_snd, m); 1378 } 1379 #endif /* ALTQ */ 1380 1381 len = m->m_pkthdr.len; 1382 mflags = m->m_flags; 1383 1384 error = (*dst_ifp->if_transmit)(dst_ifp, m); 1385 if (error) { 1386 /* mbuf is already freed */ 1387 sc->sc_if.if_oerrors++; 1388 return; 1389 } 1390 1391 sc->sc_if.if_opackets++; 1392 sc->sc_if.if_obytes += len; 1393 if (mflags & M_MCAST) 1394 sc->sc_if.if_omcasts++; 1395 } 1396 1397 /* 1398 * bridge_output: 1399 * 1400 * Send output from a bridge member interface. This 1401 * performs the bridging function for locally originated 1402 * packets. 1403 * 1404 * The mbuf has the Ethernet header already attached. We must 1405 * enqueue or free the mbuf before returning. 1406 */ 1407 int 1408 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1409 const struct rtentry *rt) 1410 { 1411 struct ether_header *eh; 1412 struct ifnet *dst_if; 1413 struct bridge_softc *sc; 1414 int s; 1415 1416 if (m->m_len < ETHER_HDR_LEN) { 1417 m = m_pullup(m, ETHER_HDR_LEN); 1418 if (m == NULL) 1419 return (0); 1420 } 1421 1422 eh = mtod(m, struct ether_header *); 1423 sc = ifp->if_bridge; 1424 1425 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1426 if (memcmp(etherbroadcastaddr, 1427 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1428 m->m_flags |= M_BCAST; 1429 else 1430 m->m_flags |= M_MCAST; 1431 } 1432 1433 /* 1434 * If bridge is down, but the original output interface is up, 1435 * go ahead and send out that interface. Otherwise, the packet 1436 * is dropped below. 1437 */ 1438 if (__predict_false(sc == NULL) || 1439 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1440 dst_if = ifp; 1441 goto sendunicast; 1442 } 1443 1444 /* 1445 * If the packet is a multicast, or we don't know a better way to 1446 * get there, send to all interfaces. 1447 */ 1448 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1449 dst_if = NULL; 1450 else 1451 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1452 if (dst_if == NULL) { 1453 /* XXX Should call bridge_broadcast, but there are locking 1454 * issues which need resolving first. */ 1455 struct bridge_iflist *bif; 1456 struct mbuf *mc; 1457 bool used = false; 1458 1459 BRIDGE_PSZ_RENTER(s); 1460 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1461 struct psref psref; 1462 1463 bridge_acquire_member(sc, bif, &psref); 1464 BRIDGE_PSZ_REXIT(s); 1465 1466 dst_if = bif->bif_ifp; 1467 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1468 goto next; 1469 1470 /* 1471 * If this is not the original output interface, 1472 * and the interface is participating in spanning 1473 * tree, make sure the port is in a state that 1474 * allows forwarding. 1475 */ 1476 if (dst_if != ifp && 1477 (bif->bif_flags & IFBIF_STP) != 0) { 1478 switch (bif->bif_state) { 1479 case BSTP_IFSTATE_BLOCKING: 1480 case BSTP_IFSTATE_LISTENING: 1481 case BSTP_IFSTATE_DISABLED: 1482 goto next; 1483 } 1484 } 1485 1486 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1487 bif_next) == NULL && 1488 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1489 dst_if == ifp)) 1490 { 1491 used = true; 1492 mc = m; 1493 } else { 1494 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1495 if (mc == NULL) { 1496 sc->sc_if.if_oerrors++; 1497 goto next; 1498 } 1499 } 1500 1501 #ifndef NET_MPSAFE 1502 s = splnet(); 1503 #endif 1504 bridge_enqueue(sc, dst_if, mc, 0); 1505 #ifndef NET_MPSAFE 1506 splx(s); 1507 #endif 1508 1509 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1510 dst_if != ifp) 1511 { 1512 if (PSLIST_READER_NEXT(bif, 1513 struct bridge_iflist, bif_next) == NULL) 1514 { 1515 used = true; 1516 mc = m; 1517 } else { 1518 mc = m_copym(m, 0, M_COPYALL, 1519 M_DONTWAIT); 1520 if (mc == NULL) { 1521 sc->sc_if.if_oerrors++; 1522 goto next; 1523 } 1524 } 1525 1526 mc->m_pkthdr.rcvif = dst_if; 1527 mc->m_flags &= ~M_PROMISC; 1528 1529 #ifndef NET_MPSAFE 1530 s = splnet(); 1531 #endif 1532 ether_input(dst_if, mc); 1533 #ifndef NET_MPSAFE 1534 splx(s); 1535 #endif 1536 } 1537 1538 next: 1539 BRIDGE_PSZ_RENTER(s); 1540 bridge_release_member(sc, bif, &psref); 1541 1542 /* Guarantee we don't re-enter the loop as we already 1543 * decided we're at the end. */ 1544 if (used) 1545 break; 1546 } 1547 BRIDGE_PSZ_REXIT(s); 1548 1549 if (!used) 1550 m_freem(m); 1551 return (0); 1552 } 1553 1554 sendunicast: 1555 /* 1556 * XXX Spanning tree consideration here? 1557 */ 1558 1559 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1560 m_freem(m); 1561 return (0); 1562 } 1563 1564 #ifndef NET_MPSAFE 1565 s = splnet(); 1566 #endif 1567 bridge_enqueue(sc, dst_if, m, 0); 1568 #ifndef NET_MPSAFE 1569 splx(s); 1570 #endif 1571 1572 return (0); 1573 } 1574 1575 /* 1576 * bridge_start: 1577 * 1578 * Start output on a bridge. 1579 * 1580 * NOTE: This routine should never be called in this implementation. 1581 */ 1582 static void 1583 bridge_start(struct ifnet *ifp) 1584 { 1585 1586 printf("%s: bridge_start() called\n", ifp->if_xname); 1587 } 1588 1589 /* 1590 * bridge_forward: 1591 * 1592 * The forwarding function of the bridge. 1593 */ 1594 static void 1595 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1596 { 1597 struct bridge_iflist *bif; 1598 struct ifnet *src_if, *dst_if; 1599 struct ether_header *eh; 1600 struct psref psref; 1601 DECLARE_LOCK_VARIABLE; 1602 1603 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1604 return; 1605 1606 src_if = m->m_pkthdr.rcvif; 1607 1608 sc->sc_if.if_ipackets++; 1609 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1610 1611 /* 1612 * Look up the bridge_iflist. 1613 */ 1614 bif = bridge_lookup_member_if(sc, src_if, &psref); 1615 if (bif == NULL) { 1616 /* Interface is not a bridge member (anymore?) */ 1617 m_freem(m); 1618 goto out; 1619 } 1620 1621 if (bif->bif_flags & IFBIF_STP) { 1622 switch (bif->bif_state) { 1623 case BSTP_IFSTATE_BLOCKING: 1624 case BSTP_IFSTATE_LISTENING: 1625 case BSTP_IFSTATE_DISABLED: 1626 m_freem(m); 1627 bridge_release_member(sc, bif, &psref); 1628 goto out; 1629 } 1630 } 1631 1632 eh = mtod(m, struct ether_header *); 1633 1634 /* 1635 * If the interface is learning, and the source 1636 * address is valid and not multicast, record 1637 * the address. 1638 */ 1639 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1640 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1641 (eh->ether_shost[0] == 0 && 1642 eh->ether_shost[1] == 0 && 1643 eh->ether_shost[2] == 0 && 1644 eh->ether_shost[3] == 0 && 1645 eh->ether_shost[4] == 0 && 1646 eh->ether_shost[5] == 0) == 0) { 1647 (void) bridge_rtupdate(sc, eh->ether_shost, 1648 src_if, 0, IFBAF_DYNAMIC); 1649 } 1650 1651 if ((bif->bif_flags & IFBIF_STP) != 0 && 1652 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1653 m_freem(m); 1654 bridge_release_member(sc, bif, &psref); 1655 goto out; 1656 } 1657 1658 bridge_release_member(sc, bif, &psref); 1659 1660 /* 1661 * At this point, the port either doesn't participate 1662 * in spanning tree or it is in the forwarding state. 1663 */ 1664 1665 /* 1666 * If the packet is unicast, destined for someone on 1667 * "this" side of the bridge, drop it. 1668 */ 1669 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1670 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1671 if (src_if == dst_if) { 1672 m_freem(m); 1673 goto out; 1674 } 1675 } else { 1676 /* ...forward it to all interfaces. */ 1677 sc->sc_if.if_imcasts++; 1678 dst_if = NULL; 1679 } 1680 1681 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1682 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1683 if (m != NULL) 1684 m_freem(m); 1685 goto out; 1686 } 1687 if (m == NULL) 1688 goto out; 1689 1690 if (dst_if == NULL) { 1691 bridge_broadcast(sc, src_if, m); 1692 goto out; 1693 } 1694 1695 /* 1696 * At this point, we're dealing with a unicast frame 1697 * going to a different interface. 1698 */ 1699 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1700 m_freem(m); 1701 goto out; 1702 } 1703 1704 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1705 if (bif == NULL) { 1706 /* Not a member of the bridge (anymore?) */ 1707 m_freem(m); 1708 goto out; 1709 } 1710 1711 if (bif->bif_flags & IFBIF_STP) { 1712 switch (bif->bif_state) { 1713 case BSTP_IFSTATE_DISABLED: 1714 case BSTP_IFSTATE_BLOCKING: 1715 m_freem(m); 1716 bridge_release_member(sc, bif, &psref); 1717 goto out; 1718 } 1719 } 1720 1721 bridge_release_member(sc, bif, &psref); 1722 1723 ACQUIRE_GLOBAL_LOCKS(); 1724 bridge_enqueue(sc, dst_if, m, 1); 1725 RELEASE_GLOBAL_LOCKS(); 1726 out: 1727 /* XXX gcc */ 1728 return; 1729 } 1730 1731 static bool 1732 bstp_state_before_learning(struct bridge_iflist *bif) 1733 { 1734 if (bif->bif_flags & IFBIF_STP) { 1735 switch (bif->bif_state) { 1736 case BSTP_IFSTATE_BLOCKING: 1737 case BSTP_IFSTATE_LISTENING: 1738 case BSTP_IFSTATE_DISABLED: 1739 return true; 1740 } 1741 } 1742 return false; 1743 } 1744 1745 static bool 1746 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1747 { 1748 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1749 1750 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1751 #if NCARP > 0 1752 || (bif->bif_ifp->if_carp && 1753 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1754 #endif /* NCARP > 0 */ 1755 ) 1756 return true; 1757 1758 return false; 1759 } 1760 1761 /* 1762 * bridge_input: 1763 * 1764 * Receive input from a member interface. Queue the packet for 1765 * bridging if it is not for us. 1766 */ 1767 static void 1768 bridge_input(struct ifnet *ifp, struct mbuf *m) 1769 { 1770 struct bridge_softc *sc = ifp->if_bridge; 1771 struct bridge_iflist *bif; 1772 struct ether_header *eh; 1773 struct psref psref; 1774 DECLARE_LOCK_VARIABLE; 1775 1776 KASSERT(!cpu_intr_p()); 1777 1778 if (__predict_false(sc == NULL) || 1779 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1780 ACQUIRE_GLOBAL_LOCKS(); 1781 ether_input(ifp, m); 1782 RELEASE_GLOBAL_LOCKS(); 1783 return; 1784 } 1785 1786 bif = bridge_lookup_member_if(sc, ifp, &psref); 1787 if (bif == NULL) { 1788 ACQUIRE_GLOBAL_LOCKS(); 1789 ether_input(ifp, m); 1790 RELEASE_GLOBAL_LOCKS(); 1791 return; 1792 } 1793 1794 eh = mtod(m, struct ether_header *); 1795 1796 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1797 if (memcmp(etherbroadcastaddr, 1798 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1799 m->m_flags |= M_BCAST; 1800 else 1801 m->m_flags |= M_MCAST; 1802 } 1803 1804 /* 1805 * A 'fast' path for packets addressed to interfaces that are 1806 * part of this bridge. 1807 */ 1808 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1809 !bstp_state_before_learning(bif)) { 1810 struct bridge_iflist *_bif; 1811 struct ifnet *_ifp = NULL; 1812 int s; 1813 struct psref _psref; 1814 1815 BRIDGE_PSZ_RENTER(s); 1816 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1817 /* It is destined for us. */ 1818 if (bridge_ourether(_bif, eh, 0)) { 1819 bridge_acquire_member(sc, _bif, &_psref); 1820 BRIDGE_PSZ_REXIT(s); 1821 if (_bif->bif_flags & IFBIF_LEARNING) 1822 (void) bridge_rtupdate(sc, 1823 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1824 _ifp = m->m_pkthdr.rcvif = _bif->bif_ifp; 1825 bridge_release_member(sc, _bif, &_psref); 1826 goto out; 1827 } 1828 1829 /* We just received a packet that we sent out. */ 1830 if (bridge_ourether(_bif, eh, 1)) 1831 break; 1832 } 1833 BRIDGE_PSZ_REXIT(s); 1834 out: 1835 1836 if (_bif != NULL) { 1837 bridge_release_member(sc, bif, &psref); 1838 if (_ifp != NULL) { 1839 m->m_flags &= ~M_PROMISC; 1840 ACQUIRE_GLOBAL_LOCKS(); 1841 ether_input(_ifp, m); 1842 RELEASE_GLOBAL_LOCKS(); 1843 } else 1844 m_freem(m); 1845 return; 1846 } 1847 } 1848 1849 /* Tap off 802.1D packets; they do not get forwarded. */ 1850 if (bif->bif_flags & IFBIF_STP && 1851 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1852 bstp_input(sc, bif, m); 1853 bridge_release_member(sc, bif, &psref); 1854 return; 1855 } 1856 1857 /* 1858 * A normal switch would discard the packet here, but that's not what 1859 * we've done historically. This also prevents some obnoxious behaviour. 1860 */ 1861 if (bstp_state_before_learning(bif)) { 1862 bridge_release_member(sc, bif, &psref); 1863 ACQUIRE_GLOBAL_LOCKS(); 1864 ether_input(ifp, m); 1865 RELEASE_GLOBAL_LOCKS(); 1866 return; 1867 } 1868 1869 bridge_release_member(sc, bif, &psref); 1870 1871 bridge_forward(sc, m); 1872 } 1873 1874 /* 1875 * bridge_broadcast: 1876 * 1877 * Send a frame to all interfaces that are members of 1878 * the bridge, except for the one on which the packet 1879 * arrived. 1880 */ 1881 static void 1882 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1883 struct mbuf *m) 1884 { 1885 struct bridge_iflist *bif; 1886 struct mbuf *mc; 1887 struct ifnet *dst_if; 1888 bool bmcast; 1889 int s; 1890 DECLARE_LOCK_VARIABLE; 1891 1892 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1893 1894 BRIDGE_PSZ_RENTER(s); 1895 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1896 struct psref psref; 1897 1898 bridge_acquire_member(sc, bif, &psref); 1899 BRIDGE_PSZ_REXIT(s); 1900 1901 dst_if = bif->bif_ifp; 1902 1903 if (bif->bif_flags & IFBIF_STP) { 1904 switch (bif->bif_state) { 1905 case BSTP_IFSTATE_BLOCKING: 1906 case BSTP_IFSTATE_DISABLED: 1907 goto next; 1908 } 1909 } 1910 1911 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1912 goto next; 1913 1914 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1915 goto next; 1916 1917 if (dst_if != src_if) { 1918 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1919 if (mc == NULL) { 1920 sc->sc_if.if_oerrors++; 1921 goto next; 1922 } 1923 ACQUIRE_GLOBAL_LOCKS(); 1924 bridge_enqueue(sc, dst_if, mc, 1); 1925 RELEASE_GLOBAL_LOCKS(); 1926 } 1927 1928 if (bmcast) { 1929 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1930 if (mc == NULL) { 1931 sc->sc_if.if_oerrors++; 1932 goto next; 1933 } 1934 1935 mc->m_pkthdr.rcvif = dst_if; 1936 mc->m_flags &= ~M_PROMISC; 1937 1938 ACQUIRE_GLOBAL_LOCKS(); 1939 ether_input(dst_if, mc); 1940 RELEASE_GLOBAL_LOCKS(); 1941 } 1942 next: 1943 BRIDGE_PSZ_RENTER(s); 1944 bridge_release_member(sc, bif, &psref); 1945 } 1946 BRIDGE_PSZ_REXIT(s); 1947 1948 m_freem(m); 1949 } 1950 1951 static int 1952 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1953 struct bridge_rtnode **brtp) 1954 { 1955 struct bridge_rtnode *brt; 1956 int error; 1957 1958 if (sc->sc_brtcnt >= sc->sc_brtmax) 1959 return ENOSPC; 1960 1961 /* 1962 * Allocate a new bridge forwarding node, and 1963 * initialize the expiration time and Ethernet 1964 * address. 1965 */ 1966 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1967 if (brt == NULL) 1968 return ENOMEM; 1969 1970 memset(brt, 0, sizeof(*brt)); 1971 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1972 brt->brt_flags = IFBAF_DYNAMIC; 1973 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1974 1975 BRIDGE_RT_LOCK(sc); 1976 error = bridge_rtnode_insert(sc, brt); 1977 BRIDGE_RT_UNLOCK(sc); 1978 1979 if (error != 0) { 1980 pool_put(&bridge_rtnode_pool, brt); 1981 return error; 1982 } 1983 1984 *brtp = brt; 1985 return 0; 1986 } 1987 1988 /* 1989 * bridge_rtupdate: 1990 * 1991 * Add a bridge routing entry. 1992 */ 1993 static int 1994 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1995 struct ifnet *dst_if, int setflags, uint8_t flags) 1996 { 1997 struct bridge_rtnode *brt; 1998 int s; 1999 2000 again: 2001 /* 2002 * A route for this destination might already exist. If so, 2003 * update it, otherwise create a new one. 2004 */ 2005 BRIDGE_RT_RENTER(s); 2006 brt = bridge_rtnode_lookup(sc, dst); 2007 2008 if (brt != NULL) { 2009 brt->brt_ifp = dst_if; 2010 if (setflags) { 2011 brt->brt_flags = flags; 2012 if (flags & IFBAF_STATIC) 2013 brt->brt_expire = 0; 2014 else 2015 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2016 } else { 2017 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2018 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2019 } 2020 } 2021 BRIDGE_RT_REXIT(s); 2022 2023 if (brt == NULL) { 2024 int r; 2025 2026 r = bridge_rtalloc(sc, dst, &brt); 2027 if (r != 0) 2028 return r; 2029 goto again; 2030 } 2031 2032 return 0; 2033 } 2034 2035 /* 2036 * bridge_rtlookup: 2037 * 2038 * Lookup the destination interface for an address. 2039 */ 2040 static struct ifnet * 2041 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2042 { 2043 struct bridge_rtnode *brt; 2044 struct ifnet *ifs = NULL; 2045 int s; 2046 2047 BRIDGE_RT_RENTER(s); 2048 brt = bridge_rtnode_lookup(sc, addr); 2049 if (brt != NULL) 2050 ifs = brt->brt_ifp; 2051 BRIDGE_RT_REXIT(s); 2052 2053 return ifs; 2054 } 2055 2056 typedef bool (*bridge_iterate_cb_t) 2057 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2058 2059 /* 2060 * bridge_rtlist_iterate_remove: 2061 * 2062 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2063 * callback judges to remove. Removals of rtnodes are done in a manner 2064 * of pserialize. To this end, all kmem_* operations are placed out of 2065 * mutexes. 2066 */ 2067 static void 2068 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2069 { 2070 struct bridge_rtnode *brt, *nbrt; 2071 struct bridge_rtnode **brt_list; 2072 int i, count; 2073 2074 retry: 2075 count = sc->sc_brtcnt; 2076 if (count == 0) 2077 return; 2078 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2079 2080 BRIDGE_RT_LOCK(sc); 2081 if (__predict_false(sc->sc_brtcnt > count)) { 2082 /* The rtnodes increased, we need more memory */ 2083 BRIDGE_RT_UNLOCK(sc); 2084 kmem_free(brt_list, sizeof(*brt_list) * count); 2085 goto retry; 2086 } 2087 2088 i = 0; 2089 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2090 bool need_break = false; 2091 if (func(sc, brt, &need_break, arg)) { 2092 bridge_rtnode_remove(sc, brt); 2093 brt_list[i++] = brt; 2094 } 2095 if (need_break) 2096 break; 2097 } 2098 2099 if (i > 0) 2100 BRIDGE_RT_PSZ_PERFORM(sc); 2101 BRIDGE_RT_UNLOCK(sc); 2102 2103 while (--i >= 0) 2104 bridge_rtnode_destroy(brt_list[i]); 2105 2106 kmem_free(brt_list, sizeof(*brt_list) * count); 2107 } 2108 2109 static bool 2110 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2111 bool *need_break, void *arg) 2112 { 2113 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2114 /* Take into account of the subsequent removal */ 2115 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2116 *need_break = true; 2117 return true; 2118 } else 2119 return false; 2120 } 2121 2122 static void 2123 bridge_rttrim0(struct bridge_softc *sc) 2124 { 2125 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2126 } 2127 2128 /* 2129 * bridge_rttrim: 2130 * 2131 * Trim the routine table so that we have a number 2132 * of routing entries less than or equal to the 2133 * maximum number. 2134 */ 2135 static void 2136 bridge_rttrim(struct bridge_softc *sc) 2137 { 2138 2139 /* Make sure we actually need to do this. */ 2140 if (sc->sc_brtcnt <= sc->sc_brtmax) 2141 return; 2142 2143 /* Force an aging cycle; this might trim enough addresses. */ 2144 bridge_rtage(sc); 2145 if (sc->sc_brtcnt <= sc->sc_brtmax) 2146 return; 2147 2148 bridge_rttrim0(sc); 2149 2150 return; 2151 } 2152 2153 /* 2154 * bridge_timer: 2155 * 2156 * Aging timer for the bridge. 2157 */ 2158 static void 2159 bridge_timer(void *arg) 2160 { 2161 struct bridge_softc *sc = arg; 2162 2163 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2164 } 2165 2166 static void 2167 bridge_rtage_work(struct work *wk, void *arg) 2168 { 2169 struct bridge_softc *sc = arg; 2170 2171 KASSERT(wk == &sc->sc_rtage_wk); 2172 2173 bridge_rtage(sc); 2174 2175 if (sc->sc_if.if_flags & IFF_RUNNING) 2176 callout_reset(&sc->sc_brcallout, 2177 bridge_rtable_prune_period * hz, bridge_timer, sc); 2178 } 2179 2180 static bool 2181 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2182 bool *need_break, void *arg) 2183 { 2184 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2185 time_uptime >= brt->brt_expire) 2186 return true; 2187 else 2188 return false; 2189 } 2190 2191 /* 2192 * bridge_rtage: 2193 * 2194 * Perform an aging cycle. 2195 */ 2196 static void 2197 bridge_rtage(struct bridge_softc *sc) 2198 { 2199 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2200 } 2201 2202 2203 static bool 2204 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2205 bool *need_break, void *arg) 2206 { 2207 int full = *(int*)arg; 2208 2209 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2210 return true; 2211 else 2212 return false; 2213 } 2214 2215 /* 2216 * bridge_rtflush: 2217 * 2218 * Remove all dynamic addresses from the bridge. 2219 */ 2220 static void 2221 bridge_rtflush(struct bridge_softc *sc, int full) 2222 { 2223 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2224 } 2225 2226 /* 2227 * bridge_rtdaddr: 2228 * 2229 * Remove an address from the table. 2230 */ 2231 static int 2232 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2233 { 2234 struct bridge_rtnode *brt; 2235 2236 BRIDGE_RT_LOCK(sc); 2237 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2238 BRIDGE_RT_UNLOCK(sc); 2239 return ENOENT; 2240 } 2241 bridge_rtnode_remove(sc, brt); 2242 BRIDGE_RT_PSZ_PERFORM(sc); 2243 BRIDGE_RT_UNLOCK(sc); 2244 2245 bridge_rtnode_destroy(brt); 2246 2247 return 0; 2248 } 2249 2250 /* 2251 * bridge_rtdelete: 2252 * 2253 * Delete routes to a speicifc member interface. 2254 */ 2255 static void 2256 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2257 { 2258 struct bridge_rtnode *brt; 2259 2260 BRIDGE_RT_LOCK(sc); 2261 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2262 if (brt->brt_ifp == ifp) 2263 break; 2264 } 2265 if (brt == NULL) { 2266 BRIDGE_RT_UNLOCK(sc); 2267 return; 2268 } 2269 bridge_rtnode_remove(sc, brt); 2270 BRIDGE_RT_PSZ_PERFORM(sc); 2271 BRIDGE_RT_UNLOCK(sc); 2272 2273 bridge_rtnode_destroy(brt); 2274 } 2275 2276 /* 2277 * bridge_rtable_init: 2278 * 2279 * Initialize the route table for this bridge. 2280 */ 2281 static void 2282 bridge_rtable_init(struct bridge_softc *sc) 2283 { 2284 int i; 2285 2286 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2287 KM_SLEEP); 2288 2289 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2290 LIST_INIT(&sc->sc_rthash[i]); 2291 2292 sc->sc_rthash_key = cprng_fast32(); 2293 2294 LIST_INIT(&sc->sc_rtlist); 2295 2296 sc->sc_rtlist_psz = pserialize_create(); 2297 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2298 } 2299 2300 /* 2301 * bridge_rtable_fini: 2302 * 2303 * Deconstruct the route table for this bridge. 2304 */ 2305 static void 2306 bridge_rtable_fini(struct bridge_softc *sc) 2307 { 2308 2309 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2310 if (sc->sc_rtlist_lock) 2311 mutex_obj_free(sc->sc_rtlist_lock); 2312 if (sc->sc_rtlist_psz) 2313 pserialize_destroy(sc->sc_rtlist_psz); 2314 } 2315 2316 /* 2317 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2318 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2319 */ 2320 #define mix(a, b, c) \ 2321 do { \ 2322 a -= b; a -= c; a ^= (c >> 13); \ 2323 b -= c; b -= a; b ^= (a << 8); \ 2324 c -= a; c -= b; c ^= (b >> 13); \ 2325 a -= b; a -= c; a ^= (c >> 12); \ 2326 b -= c; b -= a; b ^= (a << 16); \ 2327 c -= a; c -= b; c ^= (b >> 5); \ 2328 a -= b; a -= c; a ^= (c >> 3); \ 2329 b -= c; b -= a; b ^= (a << 10); \ 2330 c -= a; c -= b; c ^= (b >> 15); \ 2331 } while (/*CONSTCOND*/0) 2332 2333 static inline uint32_t 2334 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2335 { 2336 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2337 2338 b += addr[5] << 8; 2339 b += addr[4]; 2340 a += addr[3] << 24; 2341 a += addr[2] << 16; 2342 a += addr[1] << 8; 2343 a += addr[0]; 2344 2345 mix(a, b, c); 2346 2347 return (c & BRIDGE_RTHASH_MASK); 2348 } 2349 2350 #undef mix 2351 2352 /* 2353 * bridge_rtnode_lookup: 2354 * 2355 * Look up a bridge route node for the specified destination. 2356 */ 2357 static struct bridge_rtnode * 2358 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2359 { 2360 struct bridge_rtnode *brt; 2361 uint32_t hash; 2362 int dir; 2363 2364 hash = bridge_rthash(sc, addr); 2365 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2366 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2367 if (dir == 0) 2368 return (brt); 2369 if (dir > 0) 2370 return (NULL); 2371 } 2372 2373 return (NULL); 2374 } 2375 2376 /* 2377 * bridge_rtnode_insert: 2378 * 2379 * Insert the specified bridge node into the route table. We 2380 * assume the entry is not already in the table. 2381 */ 2382 static int 2383 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2384 { 2385 struct bridge_rtnode *lbrt; 2386 uint32_t hash; 2387 int dir; 2388 2389 KASSERT(BRIDGE_RT_LOCKED(sc)); 2390 2391 hash = bridge_rthash(sc, brt->brt_addr); 2392 2393 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2394 if (lbrt == NULL) { 2395 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2396 goto out; 2397 } 2398 2399 do { 2400 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2401 if (dir == 0) 2402 return (EEXIST); 2403 if (dir > 0) { 2404 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2405 goto out; 2406 } 2407 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2408 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2409 goto out; 2410 } 2411 lbrt = LIST_NEXT(lbrt, brt_hash); 2412 } while (lbrt != NULL); 2413 2414 #ifdef DIAGNOSTIC 2415 panic("bridge_rtnode_insert: impossible"); 2416 #endif 2417 2418 out: 2419 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2420 sc->sc_brtcnt++; 2421 2422 return (0); 2423 } 2424 2425 /* 2426 * bridge_rtnode_remove: 2427 * 2428 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2429 */ 2430 static void 2431 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2432 { 2433 2434 KASSERT(BRIDGE_RT_LOCKED(sc)); 2435 2436 LIST_REMOVE(brt, brt_hash); 2437 LIST_REMOVE(brt, brt_list); 2438 sc->sc_brtcnt--; 2439 } 2440 2441 /* 2442 * bridge_rtnode_destroy: 2443 * 2444 * Destroy a bridge rtnode. 2445 */ 2446 static void 2447 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2448 { 2449 2450 pool_put(&bridge_rtnode_pool, brt); 2451 } 2452 2453 #if defined(BRIDGE_IPF) 2454 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2455 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2456 2457 /* 2458 * Send bridge packets through IPF if they are one of the types IPF can deal 2459 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2460 * question.) 2461 */ 2462 static int 2463 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2464 { 2465 int snap, error; 2466 struct ether_header *eh1, eh2; 2467 struct llc llc1; 2468 uint16_t ether_type; 2469 2470 snap = 0; 2471 error = -1; /* Default error if not error == 0 */ 2472 eh1 = mtod(*mp, struct ether_header *); 2473 ether_type = ntohs(eh1->ether_type); 2474 2475 /* 2476 * Check for SNAP/LLC. 2477 */ 2478 if (ether_type < ETHERMTU) { 2479 struct llc *llc2 = (struct llc *)(eh1 + 1); 2480 2481 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2482 llc2->llc_dsap == LLC_SNAP_LSAP && 2483 llc2->llc_ssap == LLC_SNAP_LSAP && 2484 llc2->llc_control == LLC_UI) { 2485 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2486 snap = 1; 2487 } 2488 } 2489 2490 /* 2491 * If we're trying to filter bridge traffic, don't look at anything 2492 * other than IP and ARP traffic. If the filter doesn't understand 2493 * IPv6, don't allow IPv6 through the bridge either. This is lame 2494 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2495 * but of course we don't have an AppleTalk filter to begin with. 2496 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2497 * ARP traffic.) 2498 */ 2499 switch (ether_type) { 2500 case ETHERTYPE_ARP: 2501 case ETHERTYPE_REVARP: 2502 return 0; /* Automatically pass */ 2503 case ETHERTYPE_IP: 2504 # ifdef INET6 2505 case ETHERTYPE_IPV6: 2506 # endif /* INET6 */ 2507 break; 2508 default: 2509 goto bad; 2510 } 2511 2512 /* Strip off the Ethernet header and keep a copy. */ 2513 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2514 m_adj(*mp, ETHER_HDR_LEN); 2515 2516 /* Strip off snap header, if present */ 2517 if (snap) { 2518 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2519 m_adj(*mp, sizeof(struct llc)); 2520 } 2521 2522 /* 2523 * Check basic packet sanity and run IPF through pfil. 2524 */ 2525 KASSERT(!cpu_intr_p()); 2526 switch (ether_type) 2527 { 2528 case ETHERTYPE_IP : 2529 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2530 if (error == 0) 2531 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2532 break; 2533 # ifdef INET6 2534 case ETHERTYPE_IPV6 : 2535 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2536 if (error == 0) 2537 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2538 break; 2539 # endif 2540 default : 2541 error = 0; 2542 break; 2543 } 2544 2545 if (*mp == NULL) 2546 return error; 2547 if (error != 0) 2548 goto bad; 2549 2550 error = -1; 2551 2552 /* 2553 * Finally, put everything back the way it was and return 2554 */ 2555 if (snap) { 2556 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2557 if (*mp == NULL) 2558 return error; 2559 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2560 } 2561 2562 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2563 if (*mp == NULL) 2564 return error; 2565 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2566 2567 return 0; 2568 2569 bad: 2570 m_freem(*mp); 2571 *mp = NULL; 2572 return error; 2573 } 2574 2575 /* 2576 * Perform basic checks on header size since 2577 * IPF assumes ip_input has already processed 2578 * it for it. Cut-and-pasted from ip_input.c. 2579 * Given how simple the IPv6 version is, 2580 * does the IPv4 version really need to be 2581 * this complicated? 2582 * 2583 * XXX Should we update ipstat here, or not? 2584 * XXX Right now we update ipstat but not 2585 * XXX csum_counter. 2586 */ 2587 static int 2588 bridge_ip_checkbasic(struct mbuf **mp) 2589 { 2590 struct mbuf *m = *mp; 2591 struct ip *ip; 2592 int len, hlen; 2593 2594 if (*mp == NULL) 2595 return -1; 2596 2597 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2598 if ((m = m_copyup(m, sizeof(struct ip), 2599 (max_linkhdr + 3) & ~3)) == NULL) { 2600 /* XXXJRT new stat, please */ 2601 ip_statinc(IP_STAT_TOOSMALL); 2602 goto bad; 2603 } 2604 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2605 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2606 ip_statinc(IP_STAT_TOOSMALL); 2607 goto bad; 2608 } 2609 } 2610 ip = mtod(m, struct ip *); 2611 if (ip == NULL) goto bad; 2612 2613 if (ip->ip_v != IPVERSION) { 2614 ip_statinc(IP_STAT_BADVERS); 2615 goto bad; 2616 } 2617 hlen = ip->ip_hl << 2; 2618 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2619 ip_statinc(IP_STAT_BADHLEN); 2620 goto bad; 2621 } 2622 if (hlen > m->m_len) { 2623 if ((m = m_pullup(m, hlen)) == 0) { 2624 ip_statinc(IP_STAT_BADHLEN); 2625 goto bad; 2626 } 2627 ip = mtod(m, struct ip *); 2628 if (ip == NULL) goto bad; 2629 } 2630 2631 switch (m->m_pkthdr.csum_flags & 2632 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2633 M_CSUM_IPv4_BAD)) { 2634 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2635 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2636 goto bad; 2637 2638 case M_CSUM_IPv4: 2639 /* Checksum was okay. */ 2640 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2641 break; 2642 2643 default: 2644 /* Must compute it ourselves. */ 2645 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2646 if (in_cksum(m, hlen) != 0) 2647 goto bad; 2648 break; 2649 } 2650 2651 /* Retrieve the packet length. */ 2652 len = ntohs(ip->ip_len); 2653 2654 /* 2655 * Check for additional length bogosity 2656 */ 2657 if (len < hlen) { 2658 ip_statinc(IP_STAT_BADLEN); 2659 goto bad; 2660 } 2661 2662 /* 2663 * Check that the amount of data in the buffers 2664 * is as at least much as the IP header would have us expect. 2665 * Drop packet if shorter than we expect. 2666 */ 2667 if (m->m_pkthdr.len < len) { 2668 ip_statinc(IP_STAT_TOOSHORT); 2669 goto bad; 2670 } 2671 2672 /* Checks out, proceed */ 2673 *mp = m; 2674 return 0; 2675 2676 bad: 2677 *mp = m; 2678 return -1; 2679 } 2680 2681 # ifdef INET6 2682 /* 2683 * Same as above, but for IPv6. 2684 * Cut-and-pasted from ip6_input.c. 2685 * XXX Should we update ip6stat, or not? 2686 */ 2687 static int 2688 bridge_ip6_checkbasic(struct mbuf **mp) 2689 { 2690 struct mbuf *m = *mp; 2691 struct ip6_hdr *ip6; 2692 2693 /* 2694 * If the IPv6 header is not aligned, slurp it up into a new 2695 * mbuf with space for link headers, in the event we forward 2696 * it. Otherwise, if it is aligned, make sure the entire base 2697 * IPv6 header is in the first mbuf of the chain. 2698 */ 2699 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2700 struct ifnet *inifp = m->m_pkthdr.rcvif; 2701 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2702 (max_linkhdr + 3) & ~3)) == NULL) { 2703 /* XXXJRT new stat, please */ 2704 ip6_statinc(IP6_STAT_TOOSMALL); 2705 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2706 goto bad; 2707 } 2708 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2709 struct ifnet *inifp = m->m_pkthdr.rcvif; 2710 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2711 ip6_statinc(IP6_STAT_TOOSMALL); 2712 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2713 goto bad; 2714 } 2715 } 2716 2717 ip6 = mtod(m, struct ip6_hdr *); 2718 2719 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2720 ip6_statinc(IP6_STAT_BADVERS); 2721 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2722 goto bad; 2723 } 2724 2725 /* Checks out, proceed */ 2726 *mp = m; 2727 return 0; 2728 2729 bad: 2730 *mp = m; 2731 return -1; 2732 } 2733 # endif /* INET6 */ 2734 #endif /* BRIDGE_IPF */ 2735
Indexes created Mon Sep 22 21:09:42 GMT 2025