if_bridge.c revision 1.127
1 /* $NetBSD: if_bridge.c,v 1.127 2016/06/20 07:23:56 knakahara Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.127 2016/06/20 07:23:56 knakahara Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_net_mpsafe.h" 89 #endif /* _KERNEL_OPT */ 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> /* for softnet_lock */ 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 #include <sys/kauth.h> 102 #include <sys/cpu.h> 103 #include <sys/cprng.h> 104 #include <sys/mutex.h> 105 #include <sys/kmem.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_llc.h> 112 113 #include <net/if_ether.h> 114 #include <net/if_bridgevar.h> 115 116 #if defined(BRIDGE_IPF) 117 /* Used for bridge_ip[6]_checkbasic */ 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #include <netinet/ip_private.h> /* XXX */ 123 124 #include <netinet/ip6.h> 125 #include <netinet6/in6_var.h> 126 #include <netinet6/ip6_var.h> 127 #include <netinet6/ip6_private.h> /* XXX */ 128 #endif /* BRIDGE_IPF */ 129 130 /* 131 * Size of the route hash table. Must be a power of two. 132 */ 133 #ifndef BRIDGE_RTHASH_SIZE 134 #define BRIDGE_RTHASH_SIZE 1024 135 #endif 136 137 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 138 139 #include "carp.h" 140 #if NCARP > 0 141 #include <netinet/in.h> 142 #include <netinet/in_var.h> 143 #include <netinet/ip_carp.h> 144 #endif 145 146 #include "ioconf.h" 147 148 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 149 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 150 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 151 152 /* 153 * Maximum number of addresses to cache. 154 */ 155 #ifndef BRIDGE_RTABLE_MAX 156 #define BRIDGE_RTABLE_MAX 100 157 #endif 158 159 /* 160 * Spanning tree defaults. 161 */ 162 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 163 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 164 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 165 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 166 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 167 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 168 #define BSTP_DEFAULT_PATH_COST 55 169 170 /* 171 * Timeout (in seconds) for entries learned dynamically. 172 */ 173 #ifndef BRIDGE_RTABLE_TIMEOUT 174 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 175 #endif 176 177 /* 178 * Number of seconds between walks of the route list. 179 */ 180 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 181 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 182 #endif 183 184 #define BRIDGE_RT_LOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 185 mutex_enter((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 187 mutex_exit((_sc)->sc_rtlist_lock) 188 #define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \ 189 mutex_owned((_sc)->sc_rtlist_lock)) 190 191 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 192 if ((_sc)->sc_rtlist_psz != NULL) \ 193 pserialize_perform((_sc)->sc_rtlist_psz); 194 195 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 196 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 197 198 199 #ifdef NET_MPSAFE 200 #define DECLARE_LOCK_VARIABLE 201 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 202 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 203 #else 204 #define DECLARE_LOCK_VARIABLE int __s 205 #define ACQUIRE_GLOBAL_LOCKS() do { \ 206 KERNEL_LOCK(1, NULL); \ 207 mutex_enter(softnet_lock); \ 208 __s = splnet(); \ 209 } while (0) 210 #define RELEASE_GLOBAL_LOCKS() do { \ 211 splx(__s); \ 212 mutex_exit(softnet_lock); \ 213 KERNEL_UNLOCK_ONE(NULL); \ 214 } while (0) 215 #endif 216 217 struct psref_class *bridge_psref_class __read_mostly; 218 219 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 220 221 static struct pool bridge_rtnode_pool; 222 223 static int bridge_clone_create(struct if_clone *, int); 224 static int bridge_clone_destroy(struct ifnet *); 225 226 static int bridge_ioctl(struct ifnet *, u_long, void *); 227 static int bridge_init(struct ifnet *); 228 static void bridge_stop(struct ifnet *, int); 229 static void bridge_start(struct ifnet *); 230 231 static void bridge_input(struct ifnet *, struct mbuf *); 232 static void bridge_forward(struct bridge_softc *, struct mbuf *); 233 234 static void bridge_timer(void *); 235 236 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 237 struct mbuf *); 238 239 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 240 struct ifnet *, int, uint8_t); 241 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 242 static void bridge_rttrim(struct bridge_softc *); 243 static void bridge_rtage(struct bridge_softc *); 244 static void bridge_rtage_work(struct work *, void *); 245 static void bridge_rtflush(struct bridge_softc *, int); 246 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 247 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 248 249 static void bridge_rtable_init(struct bridge_softc *); 250 static void bridge_rtable_fini(struct bridge_softc *); 251 252 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 253 const uint8_t *); 254 static int bridge_rtnode_insert(struct bridge_softc *, 255 struct bridge_rtnode *); 256 static void bridge_rtnode_remove(struct bridge_softc *, 257 struct bridge_rtnode *); 258 static void bridge_rtnode_destroy(struct bridge_rtnode *); 259 260 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 261 const char *name, 262 struct psref *); 263 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 264 struct ifnet *ifp, 265 struct psref *); 266 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 267 struct psref *); 268 static void bridge_delete_member(struct bridge_softc *, 269 struct bridge_iflist *); 270 static void bridge_acquire_member(struct bridge_softc *sc, 271 struct bridge_iflist *, 272 struct psref *); 273 274 static int bridge_ioctl_add(struct bridge_softc *, void *); 275 static int bridge_ioctl_del(struct bridge_softc *, void *); 276 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 277 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 278 static int bridge_ioctl_scache(struct bridge_softc *, void *); 279 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 280 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 281 static int bridge_ioctl_rts(struct bridge_softc *, void *); 282 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 283 static int bridge_ioctl_sto(struct bridge_softc *, void *); 284 static int bridge_ioctl_gto(struct bridge_softc *, void *); 285 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 286 static int bridge_ioctl_flush(struct bridge_softc *, void *); 287 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 288 static int bridge_ioctl_spri(struct bridge_softc *, void *); 289 static int bridge_ioctl_ght(struct bridge_softc *, void *); 290 static int bridge_ioctl_sht(struct bridge_softc *, void *); 291 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 292 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 293 static int bridge_ioctl_gma(struct bridge_softc *, void *); 294 static int bridge_ioctl_sma(struct bridge_softc *, void *); 295 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 297 #if defined(BRIDGE_IPF) 298 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 299 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 300 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 301 static int bridge_ip_checkbasic(struct mbuf **mp); 302 # ifdef INET6 303 static int bridge_ip6_checkbasic(struct mbuf **mp); 304 # endif /* INET6 */ 305 #endif /* BRIDGE_IPF */ 306 307 struct bridge_control { 308 int (*bc_func)(struct bridge_softc *, void *); 309 int bc_argsize; 310 int bc_flags; 311 }; 312 313 #define BC_F_COPYIN 0x01 /* copy arguments in */ 314 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 315 #define BC_F_SUSER 0x04 /* do super-user check */ 316 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 317 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 318 319 static const struct bridge_control bridge_control_table[] = { 320 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 321 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 322 323 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 324 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 325 326 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 327 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 328 329 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 330 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 331 332 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 333 334 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 335 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 336 337 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 338 339 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 343 344 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 345 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 350 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 351 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 354 355 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 356 #if defined(BRIDGE_IPF) 357 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 358 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 359 #endif /* BRIDGE_IPF */ 360 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 361 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 362 }; 363 364 static const int bridge_control_table_size = __arraycount(bridge_control_table); 365 366 static struct if_clone bridge_cloner = 367 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 368 369 /* 370 * bridgeattach: 371 * 372 * Pseudo-device attach routine. 373 */ 374 void 375 bridgeattach(int n) 376 { 377 378 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 379 0, 0, 0, "brtpl", NULL, IPL_NET); 380 381 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 382 383 if_clone_attach(&bridge_cloner); 384 } 385 386 /* 387 * bridge_clone_create: 388 * 389 * Create a new bridge instance. 390 */ 391 static int 392 bridge_clone_create(struct if_clone *ifc, int unit) 393 { 394 struct bridge_softc *sc; 395 struct ifnet *ifp; 396 int error; 397 398 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 399 ifp = &sc->sc_if; 400 401 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 402 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 403 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 404 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 405 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 406 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 407 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 408 sc->sc_filter_flags = 0; 409 410 /* Initialize our routing table. */ 411 bridge_rtable_init(sc); 412 413 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 414 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 415 if (error) 416 panic("%s: workqueue_create %d\n", __func__, error); 417 418 callout_init(&sc->sc_brcallout, 0); 419 callout_init(&sc->sc_bstpcallout, 0); 420 421 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 422 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 423 sc->sc_iflist_psref.bip_psz = pserialize_create(); 424 425 if_initname(ifp, ifc->ifc_name, unit); 426 ifp->if_softc = sc; 427 ifp->if_extflags = IFEF_OUTPUT_MPSAFE; 428 ifp->if_mtu = ETHERMTU; 429 ifp->if_ioctl = bridge_ioctl; 430 ifp->if_output = bridge_output; 431 ifp->if_start = bridge_start; 432 ifp->if_stop = bridge_stop; 433 ifp->if_init = bridge_init; 434 ifp->if_type = IFT_BRIDGE; 435 ifp->if_addrlen = 0; 436 ifp->if_dlt = DLT_EN10MB; 437 ifp->if_hdrlen = ETHER_HDR_LEN; 438 439 if_initialize(ifp); 440 if_register(ifp); 441 442 if_alloc_sadl(ifp); 443 444 return (0); 445 } 446 447 /* 448 * bridge_clone_destroy: 449 * 450 * Destroy a bridge instance. 451 */ 452 static int 453 bridge_clone_destroy(struct ifnet *ifp) 454 { 455 struct bridge_softc *sc = ifp->if_softc; 456 struct bridge_iflist *bif; 457 int s; 458 459 s = splnet(); 460 461 bridge_stop(ifp, 1); 462 463 BRIDGE_LOCK(sc); 464 for (;;) { 465 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 466 bif_next); 467 if (bif == NULL) 468 break; 469 bridge_delete_member(sc, bif); 470 } 471 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 472 BRIDGE_UNLOCK(sc); 473 474 splx(s); 475 476 if_detach(ifp); 477 478 /* Tear down the routing table. */ 479 bridge_rtable_fini(sc); 480 481 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 482 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 483 484 workqueue_destroy(sc->sc_rtage_wq); 485 486 kmem_free(sc, sizeof(*sc)); 487 488 return (0); 489 } 490 491 /* 492 * bridge_ioctl: 493 * 494 * Handle a control request from the operator. 495 */ 496 static int 497 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 498 { 499 struct bridge_softc *sc = ifp->if_softc; 500 struct lwp *l = curlwp; /* XXX */ 501 union { 502 struct ifbreq ifbreq; 503 struct ifbifconf ifbifconf; 504 struct ifbareq ifbareq; 505 struct ifbaconf ifbaconf; 506 struct ifbrparam ifbrparam; 507 } args; 508 struct ifdrv *ifd = (struct ifdrv *) data; 509 const struct bridge_control *bc = NULL; /* XXXGCC */ 510 int s, error = 0; 511 512 /* Authorize command before calling splnet(). */ 513 switch (cmd) { 514 case SIOCGDRVSPEC: 515 case SIOCSDRVSPEC: 516 if (ifd->ifd_cmd >= bridge_control_table_size 517 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 518 error = EINVAL; 519 return error; 520 } 521 522 /* We only care about BC_F_SUSER at this point. */ 523 if ((bc->bc_flags & BC_F_SUSER) == 0) 524 break; 525 526 error = kauth_authorize_network(l->l_cred, 527 KAUTH_NETWORK_INTERFACE_BRIDGE, 528 cmd == SIOCGDRVSPEC ? 529 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 530 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 531 ifd, NULL, NULL); 532 if (error) 533 return (error); 534 535 break; 536 } 537 538 s = splnet(); 539 540 switch (cmd) { 541 case SIOCGDRVSPEC: 542 case SIOCSDRVSPEC: 543 KASSERT(bc != NULL); 544 if (cmd == SIOCGDRVSPEC && 545 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 546 error = EINVAL; 547 break; 548 } 549 else if (cmd == SIOCSDRVSPEC && 550 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 551 error = EINVAL; 552 break; 553 } 554 555 /* BC_F_SUSER is checked above, before splnet(). */ 556 557 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 558 && (ifd->ifd_len != bc->bc_argsize 559 || ifd->ifd_len > sizeof(args))) { 560 error = EINVAL; 561 break; 562 } 563 564 memset(&args, 0, sizeof(args)); 565 if (bc->bc_flags & BC_F_COPYIN) { 566 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 567 if (error) 568 break; 569 } else if (bc->bc_flags & BC_F_XLATEIN) { 570 args.ifbifconf.ifbic_len = ifd->ifd_len; 571 args.ifbifconf.ifbic_buf = ifd->ifd_data; 572 } 573 574 error = (*bc->bc_func)(sc, &args); 575 if (error) 576 break; 577 578 if (bc->bc_flags & BC_F_COPYOUT) { 579 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 580 } else if (bc->bc_flags & BC_F_XLATEOUT) { 581 ifd->ifd_len = args.ifbifconf.ifbic_len; 582 ifd->ifd_data = args.ifbifconf.ifbic_buf; 583 } 584 break; 585 586 case SIOCSIFFLAGS: 587 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 588 break; 589 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 590 case IFF_RUNNING: 591 /* 592 * If interface is marked down and it is running, 593 * then stop and disable it. 594 */ 595 (*ifp->if_stop)(ifp, 1); 596 break; 597 case IFF_UP: 598 /* 599 * If interface is marked up and it is stopped, then 600 * start it. 601 */ 602 error = (*ifp->if_init)(ifp); 603 break; 604 default: 605 break; 606 } 607 break; 608 609 case SIOCSIFMTU: 610 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 611 error = 0; 612 break; 613 614 default: 615 error = ifioctl_common(ifp, cmd, data); 616 break; 617 } 618 619 splx(s); 620 621 return (error); 622 } 623 624 /* 625 * bridge_lookup_member: 626 * 627 * Lookup a bridge member interface. 628 */ 629 static struct bridge_iflist * 630 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 631 { 632 struct bridge_iflist *bif; 633 struct ifnet *ifp; 634 int s; 635 636 BRIDGE_PSZ_RENTER(s); 637 638 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 639 ifp = bif->bif_ifp; 640 if (strcmp(ifp->if_xname, name) == 0) 641 break; 642 } 643 if (bif != NULL) 644 bridge_acquire_member(sc, bif, psref); 645 646 BRIDGE_PSZ_REXIT(s); 647 648 return bif; 649 } 650 651 /* 652 * bridge_lookup_member_if: 653 * 654 * Lookup a bridge member interface by ifnet*. 655 */ 656 static struct bridge_iflist * 657 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 658 struct psref *psref) 659 { 660 struct bridge_iflist *bif; 661 int s; 662 663 BRIDGE_PSZ_RENTER(s); 664 665 bif = member_ifp->if_bridgeif; 666 if (bif != NULL) { 667 psref_acquire(psref, &bif->bif_psref, 668 bridge_psref_class); 669 } 670 671 BRIDGE_PSZ_REXIT(s); 672 673 return bif; 674 } 675 676 static void 677 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 678 struct psref *psref) 679 { 680 681 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 682 } 683 684 /* 685 * bridge_release_member: 686 * 687 * Release the specified member interface. 688 */ 689 static void 690 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 691 struct psref *psref) 692 { 693 694 psref_release(psref, &bif->bif_psref, bridge_psref_class); 695 } 696 697 /* 698 * bridge_delete_member: 699 * 700 * Delete the specified member interface. 701 */ 702 static void 703 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 704 { 705 struct ifnet *ifs = bif->bif_ifp; 706 707 KASSERT(BRIDGE_LOCKED(sc)); 708 709 ifs->_if_input = ether_input; 710 ifs->if_bridge = NULL; 711 ifs->if_bridgeif = NULL; 712 713 PSLIST_WRITER_REMOVE(bif, bif_next); 714 BRIDGE_PSZ_PERFORM(sc); 715 BRIDGE_UNLOCK(sc); 716 717 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 718 719 PSLIST_ENTRY_DESTROY(bif, bif_next); 720 kmem_free(bif, sizeof(*bif)); 721 722 BRIDGE_LOCK(sc); 723 } 724 725 static int 726 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 727 { 728 struct ifbreq *req = arg; 729 struct bridge_iflist *bif = NULL; 730 struct ifnet *ifs; 731 int error = 0; 732 struct psref psref; 733 734 ifs = if_get(req->ifbr_ifsname, &psref); 735 if (ifs == NULL) 736 return (ENOENT); 737 738 if (sc->sc_if.if_mtu != ifs->if_mtu) { 739 error = EINVAL; 740 goto out; 741 } 742 743 if (ifs->if_bridge == sc) { 744 error = EEXIST; 745 goto out; 746 } 747 748 if (ifs->if_bridge != NULL) { 749 error = EBUSY; 750 goto out; 751 } 752 753 if (ifs->_if_input != ether_input) { 754 error = EINVAL; 755 goto out; 756 } 757 758 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 759 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 760 error = EINVAL; 761 goto out; 762 } 763 764 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 765 766 switch (ifs->if_type) { 767 case IFT_ETHER: 768 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 769 goto out; 770 /* 771 * Place the interface into promiscuous mode. 772 */ 773 error = ifpromisc(ifs, 1); 774 if (error) 775 goto out; 776 break; 777 default: 778 error = EINVAL; 779 goto out; 780 } 781 782 bif->bif_ifp = ifs; 783 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 784 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 785 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 786 PSLIST_ENTRY_INIT(bif, bif_next); 787 psref_target_init(&bif->bif_psref, bridge_psref_class); 788 789 BRIDGE_LOCK(sc); 790 791 ifs->if_bridge = sc; 792 ifs->if_bridgeif = bif; 793 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 794 ifs->_if_input = bridge_input; 795 796 BRIDGE_UNLOCK(sc); 797 798 if (sc->sc_if.if_flags & IFF_RUNNING) 799 bstp_initialization(sc); 800 else 801 bstp_stop(sc); 802 803 out: 804 if_put(ifs, &psref); 805 if (error) { 806 if (bif != NULL) 807 kmem_free(bif, sizeof(*bif)); 808 } 809 return (error); 810 } 811 812 static int 813 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 814 { 815 struct ifbreq *req = arg; 816 const char *name = req->ifbr_ifsname; 817 struct bridge_iflist *bif; 818 struct ifnet *ifs; 819 820 BRIDGE_LOCK(sc); 821 822 /* 823 * Don't use bridge_lookup_member. We want to get a member 824 * with bif_refs == 0. 825 */ 826 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 827 ifs = bif->bif_ifp; 828 if (strcmp(ifs->if_xname, name) == 0) 829 break; 830 } 831 832 if (bif == NULL) { 833 BRIDGE_UNLOCK(sc); 834 return ENOENT; 835 } 836 837 bridge_delete_member(sc, bif); 838 839 BRIDGE_UNLOCK(sc); 840 841 switch (ifs->if_type) { 842 case IFT_ETHER: 843 /* 844 * Take the interface out of promiscuous mode. 845 * Don't call it with holding a spin lock. 846 */ 847 (void) ifpromisc(ifs, 0); 848 (void) ether_disable_vlan_mtu(ifs); 849 break; 850 default: 851 #ifdef DIAGNOSTIC 852 panic("bridge_delete_member: impossible"); 853 #endif 854 break; 855 } 856 857 bridge_rtdelete(sc, ifs); 858 859 if (sc->sc_if.if_flags & IFF_RUNNING) 860 bstp_initialization(sc); 861 862 return 0; 863 } 864 865 static int 866 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 867 { 868 struct ifbreq *req = arg; 869 struct bridge_iflist *bif; 870 struct psref psref; 871 872 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 873 if (bif == NULL) 874 return (ENOENT); 875 876 req->ifbr_ifsflags = bif->bif_flags; 877 req->ifbr_state = bif->bif_state; 878 req->ifbr_priority = bif->bif_priority; 879 req->ifbr_path_cost = bif->bif_path_cost; 880 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 881 882 bridge_release_member(sc, bif, &psref); 883 884 return (0); 885 } 886 887 static int 888 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 889 { 890 struct ifbreq *req = arg; 891 struct bridge_iflist *bif; 892 struct psref psref; 893 894 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 895 if (bif == NULL) 896 return (ENOENT); 897 898 if (req->ifbr_ifsflags & IFBIF_STP) { 899 switch (bif->bif_ifp->if_type) { 900 case IFT_ETHER: 901 /* These can do spanning tree. */ 902 break; 903 904 default: 905 /* Nothing else can. */ 906 bridge_release_member(sc, bif, &psref); 907 return (EINVAL); 908 } 909 } 910 911 bif->bif_flags = req->ifbr_ifsflags; 912 913 bridge_release_member(sc, bif, &psref); 914 915 if (sc->sc_if.if_flags & IFF_RUNNING) 916 bstp_initialization(sc); 917 918 return (0); 919 } 920 921 static int 922 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 923 { 924 struct ifbrparam *param = arg; 925 926 sc->sc_brtmax = param->ifbrp_csize; 927 bridge_rttrim(sc); 928 929 return (0); 930 } 931 932 static int 933 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 934 { 935 struct ifbrparam *param = arg; 936 937 param->ifbrp_csize = sc->sc_brtmax; 938 939 return (0); 940 } 941 942 static int 943 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 944 { 945 struct ifbifconf *bifc = arg; 946 struct bridge_iflist *bif; 947 struct ifbreq *breqs; 948 int i, count, error = 0; 949 950 retry: 951 BRIDGE_LOCK(sc); 952 count = 0; 953 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 954 count++; 955 BRIDGE_UNLOCK(sc); 956 957 if (count == 0) { 958 bifc->ifbic_len = 0; 959 return 0; 960 } 961 962 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 963 /* Tell that a larger buffer is needed */ 964 bifc->ifbic_len = sizeof(*breqs) * count; 965 return 0; 966 } 967 968 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 969 970 BRIDGE_LOCK(sc); 971 972 i = 0; 973 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 974 i++; 975 if (i > count) { 976 /* 977 * The number of members has been increased. 978 * We need more memory! 979 */ 980 BRIDGE_UNLOCK(sc); 981 kmem_free(breqs, sizeof(*breqs) * count); 982 goto retry; 983 } 984 985 i = 0; 986 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 987 struct ifbreq *breq = &breqs[i++]; 988 memset(breq, 0, sizeof(*breq)); 989 990 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 991 sizeof(breq->ifbr_ifsname)); 992 breq->ifbr_ifsflags = bif->bif_flags; 993 breq->ifbr_state = bif->bif_state; 994 breq->ifbr_priority = bif->bif_priority; 995 breq->ifbr_path_cost = bif->bif_path_cost; 996 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 997 } 998 999 /* Don't call copyout with holding the mutex */ 1000 BRIDGE_UNLOCK(sc); 1001 1002 for (i = 0; i < count; i++) { 1003 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1004 if (error) 1005 break; 1006 } 1007 bifc->ifbic_len = sizeof(*breqs) * i; 1008 1009 kmem_free(breqs, sizeof(*breqs) * count); 1010 1011 return error; 1012 } 1013 1014 static int 1015 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1016 { 1017 struct ifbaconf *bac = arg; 1018 struct bridge_rtnode *brt; 1019 struct ifbareq bareq; 1020 int count = 0, error = 0, len; 1021 1022 if (bac->ifbac_len == 0) 1023 return (0); 1024 1025 BRIDGE_RT_LOCK(sc); 1026 1027 len = bac->ifbac_len; 1028 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1029 if (len < sizeof(bareq)) 1030 goto out; 1031 memset(&bareq, 0, sizeof(bareq)); 1032 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1033 sizeof(bareq.ifba_ifsname)); 1034 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1035 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1036 bareq.ifba_expire = brt->brt_expire - time_uptime; 1037 } else 1038 bareq.ifba_expire = 0; 1039 bareq.ifba_flags = brt->brt_flags; 1040 1041 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1042 if (error) 1043 goto out; 1044 count++; 1045 len -= sizeof(bareq); 1046 } 1047 out: 1048 BRIDGE_RT_UNLOCK(sc); 1049 1050 bac->ifbac_len = sizeof(bareq) * count; 1051 return (error); 1052 } 1053 1054 static int 1055 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1056 { 1057 struct ifbareq *req = arg; 1058 struct bridge_iflist *bif; 1059 int error; 1060 struct psref psref; 1061 1062 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1063 if (bif == NULL) 1064 return (ENOENT); 1065 1066 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1067 req->ifba_flags); 1068 1069 bridge_release_member(sc, bif, &psref); 1070 1071 return (error); 1072 } 1073 1074 static int 1075 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1076 { 1077 struct ifbrparam *param = arg; 1078 1079 sc->sc_brttimeout = param->ifbrp_ctime; 1080 1081 return (0); 1082 } 1083 1084 static int 1085 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1086 { 1087 struct ifbrparam *param = arg; 1088 1089 param->ifbrp_ctime = sc->sc_brttimeout; 1090 1091 return (0); 1092 } 1093 1094 static int 1095 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1096 { 1097 struct ifbareq *req = arg; 1098 1099 return (bridge_rtdaddr(sc, req->ifba_dst)); 1100 } 1101 1102 static int 1103 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1104 { 1105 struct ifbreq *req = arg; 1106 1107 bridge_rtflush(sc, req->ifbr_ifsflags); 1108 1109 return (0); 1110 } 1111 1112 static int 1113 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1114 { 1115 struct ifbrparam *param = arg; 1116 1117 param->ifbrp_prio = sc->sc_bridge_priority; 1118 1119 return (0); 1120 } 1121 1122 static int 1123 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1124 { 1125 struct ifbrparam *param = arg; 1126 1127 sc->sc_bridge_priority = param->ifbrp_prio; 1128 1129 if (sc->sc_if.if_flags & IFF_RUNNING) 1130 bstp_initialization(sc); 1131 1132 return (0); 1133 } 1134 1135 static int 1136 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1137 { 1138 struct ifbrparam *param = arg; 1139 1140 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1141 1142 return (0); 1143 } 1144 1145 static int 1146 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1147 { 1148 struct ifbrparam *param = arg; 1149 1150 if (param->ifbrp_hellotime == 0) 1151 return (EINVAL); 1152 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1153 1154 if (sc->sc_if.if_flags & IFF_RUNNING) 1155 bstp_initialization(sc); 1156 1157 return (0); 1158 } 1159 1160 static int 1161 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1162 { 1163 struct ifbrparam *param = arg; 1164 1165 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1166 1167 return (0); 1168 } 1169 1170 static int 1171 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1172 { 1173 struct ifbrparam *param = arg; 1174 1175 if (param->ifbrp_fwddelay == 0) 1176 return (EINVAL); 1177 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1178 1179 if (sc->sc_if.if_flags & IFF_RUNNING) 1180 bstp_initialization(sc); 1181 1182 return (0); 1183 } 1184 1185 static int 1186 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1187 { 1188 struct ifbrparam *param = arg; 1189 1190 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1191 1192 return (0); 1193 } 1194 1195 static int 1196 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1197 { 1198 struct ifbrparam *param = arg; 1199 1200 if (param->ifbrp_maxage == 0) 1201 return (EINVAL); 1202 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1203 1204 if (sc->sc_if.if_flags & IFF_RUNNING) 1205 bstp_initialization(sc); 1206 1207 return (0); 1208 } 1209 1210 static int 1211 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1212 { 1213 struct ifbreq *req = arg; 1214 struct bridge_iflist *bif; 1215 struct psref psref; 1216 1217 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1218 if (bif == NULL) 1219 return (ENOENT); 1220 1221 bif->bif_priority = req->ifbr_priority; 1222 1223 if (sc->sc_if.if_flags & IFF_RUNNING) 1224 bstp_initialization(sc); 1225 1226 bridge_release_member(sc, bif, &psref); 1227 1228 return (0); 1229 } 1230 1231 #if defined(BRIDGE_IPF) 1232 static int 1233 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1234 { 1235 struct ifbrparam *param = arg; 1236 1237 param->ifbrp_filter = sc->sc_filter_flags; 1238 1239 return (0); 1240 } 1241 1242 static int 1243 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1244 { 1245 struct ifbrparam *param = arg; 1246 uint32_t nflags, oflags; 1247 1248 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1249 return (EINVAL); 1250 1251 nflags = param->ifbrp_filter; 1252 oflags = sc->sc_filter_flags; 1253 1254 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1255 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1256 sc->sc_if.if_pfil); 1257 } 1258 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1259 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1260 sc->sc_if.if_pfil); 1261 } 1262 1263 sc->sc_filter_flags = nflags; 1264 1265 return (0); 1266 } 1267 #endif /* BRIDGE_IPF */ 1268 1269 static int 1270 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1271 { 1272 struct ifbreq *req = arg; 1273 struct bridge_iflist *bif; 1274 struct psref psref; 1275 1276 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1277 if (bif == NULL) 1278 return (ENOENT); 1279 1280 bif->bif_path_cost = req->ifbr_path_cost; 1281 1282 if (sc->sc_if.if_flags & IFF_RUNNING) 1283 bstp_initialization(sc); 1284 1285 bridge_release_member(sc, bif, &psref); 1286 1287 return (0); 1288 } 1289 1290 /* 1291 * bridge_ifdetach: 1292 * 1293 * Detach an interface from a bridge. Called when a member 1294 * interface is detaching. 1295 */ 1296 void 1297 bridge_ifdetach(struct ifnet *ifp) 1298 { 1299 struct bridge_softc *sc = ifp->if_bridge; 1300 struct ifbreq breq; 1301 1302 /* ioctl_lock should prevent this from happening */ 1303 KASSERT(sc != NULL); 1304 1305 memset(&breq, 0, sizeof(breq)); 1306 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1307 1308 (void) bridge_ioctl_del(sc, &breq); 1309 } 1310 1311 /* 1312 * bridge_init: 1313 * 1314 * Initialize a bridge interface. 1315 */ 1316 static int 1317 bridge_init(struct ifnet *ifp) 1318 { 1319 struct bridge_softc *sc = ifp->if_softc; 1320 1321 if (ifp->if_flags & IFF_RUNNING) 1322 return (0); 1323 1324 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1325 bridge_timer, sc); 1326 1327 ifp->if_flags |= IFF_RUNNING; 1328 bstp_initialization(sc); 1329 return (0); 1330 } 1331 1332 /* 1333 * bridge_stop: 1334 * 1335 * Stop the bridge interface. 1336 */ 1337 static void 1338 bridge_stop(struct ifnet *ifp, int disable) 1339 { 1340 struct bridge_softc *sc = ifp->if_softc; 1341 1342 if ((ifp->if_flags & IFF_RUNNING) == 0) 1343 return; 1344 1345 callout_stop(&sc->sc_brcallout); 1346 bstp_stop(sc); 1347 1348 bridge_rtflush(sc, IFBF_FLUSHDYN); 1349 1350 ifp->if_flags &= ~IFF_RUNNING; 1351 } 1352 1353 /* 1354 * bridge_enqueue: 1355 * 1356 * Enqueue a packet on a bridge member interface. 1357 */ 1358 void 1359 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1360 int runfilt) 1361 { 1362 int len, error; 1363 short mflags; 1364 1365 /* 1366 * Clear any in-bound checksum flags for this packet. 1367 */ 1368 m->m_pkthdr.csum_flags = 0; 1369 1370 if (runfilt) { 1371 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1372 dst_ifp, PFIL_OUT) != 0) { 1373 if (m != NULL) 1374 m_freem(m); 1375 return; 1376 } 1377 if (m == NULL) 1378 return; 1379 } 1380 1381 #ifdef ALTQ 1382 KERNEL_LOCK(1, NULL); 1383 /* 1384 * If ALTQ is enabled on the member interface, do 1385 * classification; the queueing discipline might 1386 * not require classification, but might require 1387 * the address family/header pointer in the pktattr. 1388 */ 1389 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1390 /* XXX IFT_ETHER */ 1391 altq_etherclassify(&dst_ifp->if_snd, m); 1392 } 1393 KERNEL_UNLOCK_ONE(NULL); 1394 #endif /* ALTQ */ 1395 1396 len = m->m_pkthdr.len; 1397 mflags = m->m_flags; 1398 1399 error = (*dst_ifp->if_transmit)(dst_ifp, m); 1400 if (error) { 1401 /* mbuf is already freed */ 1402 sc->sc_if.if_oerrors++; 1403 return; 1404 } 1405 1406 sc->sc_if.if_opackets++; 1407 sc->sc_if.if_obytes += len; 1408 if (mflags & M_MCAST) 1409 sc->sc_if.if_omcasts++; 1410 } 1411 1412 /* 1413 * bridge_output: 1414 * 1415 * Send output from a bridge member interface. This 1416 * performs the bridging function for locally originated 1417 * packets. 1418 * 1419 * The mbuf has the Ethernet header already attached. We must 1420 * enqueue or free the mbuf before returning. 1421 */ 1422 int 1423 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1424 const struct rtentry *rt) 1425 { 1426 struct ether_header *eh; 1427 struct ifnet *dst_if; 1428 struct bridge_softc *sc; 1429 int s; 1430 1431 if (m->m_len < ETHER_HDR_LEN) { 1432 m = m_pullup(m, ETHER_HDR_LEN); 1433 if (m == NULL) 1434 return (0); 1435 } 1436 1437 eh = mtod(m, struct ether_header *); 1438 sc = ifp->if_bridge; 1439 1440 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1441 if (memcmp(etherbroadcastaddr, 1442 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1443 m->m_flags |= M_BCAST; 1444 else 1445 m->m_flags |= M_MCAST; 1446 } 1447 1448 /* 1449 * If bridge is down, but the original output interface is up, 1450 * go ahead and send out that interface. Otherwise, the packet 1451 * is dropped below. 1452 */ 1453 if (__predict_false(sc == NULL) || 1454 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1455 dst_if = ifp; 1456 goto sendunicast; 1457 } 1458 1459 /* 1460 * If the packet is a multicast, or we don't know a better way to 1461 * get there, send to all interfaces. 1462 */ 1463 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1464 dst_if = NULL; 1465 else 1466 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1467 if (dst_if == NULL) { 1468 /* XXX Should call bridge_broadcast, but there are locking 1469 * issues which need resolving first. */ 1470 struct bridge_iflist *bif; 1471 struct mbuf *mc; 1472 bool used = false; 1473 1474 BRIDGE_PSZ_RENTER(s); 1475 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1476 struct psref psref; 1477 1478 bridge_acquire_member(sc, bif, &psref); 1479 BRIDGE_PSZ_REXIT(s); 1480 1481 dst_if = bif->bif_ifp; 1482 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1483 goto next; 1484 1485 /* 1486 * If this is not the original output interface, 1487 * and the interface is participating in spanning 1488 * tree, make sure the port is in a state that 1489 * allows forwarding. 1490 */ 1491 if (dst_if != ifp && 1492 (bif->bif_flags & IFBIF_STP) != 0) { 1493 switch (bif->bif_state) { 1494 case BSTP_IFSTATE_BLOCKING: 1495 case BSTP_IFSTATE_LISTENING: 1496 case BSTP_IFSTATE_DISABLED: 1497 goto next; 1498 } 1499 } 1500 1501 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1502 bif_next) == NULL && 1503 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1504 dst_if == ifp)) 1505 { 1506 used = true; 1507 mc = m; 1508 } else { 1509 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1510 if (mc == NULL) { 1511 sc->sc_if.if_oerrors++; 1512 goto next; 1513 } 1514 } 1515 1516 #ifndef NET_MPSAFE 1517 s = splnet(); 1518 #endif 1519 bridge_enqueue(sc, dst_if, mc, 0); 1520 #ifndef NET_MPSAFE 1521 splx(s); 1522 #endif 1523 1524 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1525 dst_if != ifp) 1526 { 1527 if (PSLIST_READER_NEXT(bif, 1528 struct bridge_iflist, bif_next) == NULL) 1529 { 1530 used = true; 1531 mc = m; 1532 } else { 1533 mc = m_copym(m, 0, M_COPYALL, 1534 M_DONTWAIT); 1535 if (mc == NULL) { 1536 sc->sc_if.if_oerrors++; 1537 goto next; 1538 } 1539 } 1540 1541 m_set_rcvif(mc, dst_if); 1542 mc->m_flags &= ~M_PROMISC; 1543 1544 #ifndef NET_MPSAFE 1545 s = splnet(); 1546 #endif 1547 ether_input(dst_if, mc); 1548 #ifndef NET_MPSAFE 1549 splx(s); 1550 #endif 1551 } 1552 1553 next: 1554 BRIDGE_PSZ_RENTER(s); 1555 bridge_release_member(sc, bif, &psref); 1556 1557 /* Guarantee we don't re-enter the loop as we already 1558 * decided we're at the end. */ 1559 if (used) 1560 break; 1561 } 1562 BRIDGE_PSZ_REXIT(s); 1563 1564 if (!used) 1565 m_freem(m); 1566 return (0); 1567 } 1568 1569 sendunicast: 1570 /* 1571 * XXX Spanning tree consideration here? 1572 */ 1573 1574 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1575 m_freem(m); 1576 return (0); 1577 } 1578 1579 #ifndef NET_MPSAFE 1580 s = splnet(); 1581 #endif 1582 bridge_enqueue(sc, dst_if, m, 0); 1583 #ifndef NET_MPSAFE 1584 splx(s); 1585 #endif 1586 1587 return (0); 1588 } 1589 1590 /* 1591 * bridge_start: 1592 * 1593 * Start output on a bridge. 1594 * 1595 * NOTE: This routine should never be called in this implementation. 1596 */ 1597 static void 1598 bridge_start(struct ifnet *ifp) 1599 { 1600 1601 printf("%s: bridge_start() called\n", ifp->if_xname); 1602 } 1603 1604 /* 1605 * bridge_forward: 1606 * 1607 * The forwarding function of the bridge. 1608 */ 1609 static void 1610 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1611 { 1612 struct bridge_iflist *bif; 1613 struct ifnet *src_if, *dst_if; 1614 struct ether_header *eh; 1615 struct psref psref; 1616 struct psref psref_src; 1617 DECLARE_LOCK_VARIABLE; 1618 1619 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1620 return; 1621 1622 src_if = m_get_rcvif_psref(m, &psref_src); 1623 if (src_if == NULL) { 1624 /* Interface is being destroyed? */ 1625 m_freem(m); 1626 goto out; 1627 } 1628 1629 sc->sc_if.if_ipackets++; 1630 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1631 1632 /* 1633 * Look up the bridge_iflist. 1634 */ 1635 bif = bridge_lookup_member_if(sc, src_if, &psref); 1636 if (bif == NULL) { 1637 /* Interface is not a bridge member (anymore?) */ 1638 m_freem(m); 1639 goto out; 1640 } 1641 1642 if (bif->bif_flags & IFBIF_STP) { 1643 switch (bif->bif_state) { 1644 case BSTP_IFSTATE_BLOCKING: 1645 case BSTP_IFSTATE_LISTENING: 1646 case BSTP_IFSTATE_DISABLED: 1647 m_freem(m); 1648 bridge_release_member(sc, bif, &psref); 1649 goto out; 1650 } 1651 } 1652 1653 eh = mtod(m, struct ether_header *); 1654 1655 /* 1656 * If the interface is learning, and the source 1657 * address is valid and not multicast, record 1658 * the address. 1659 */ 1660 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1661 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1662 (eh->ether_shost[0] == 0 && 1663 eh->ether_shost[1] == 0 && 1664 eh->ether_shost[2] == 0 && 1665 eh->ether_shost[3] == 0 && 1666 eh->ether_shost[4] == 0 && 1667 eh->ether_shost[5] == 0) == 0) { 1668 (void) bridge_rtupdate(sc, eh->ether_shost, 1669 src_if, 0, IFBAF_DYNAMIC); 1670 } 1671 1672 if ((bif->bif_flags & IFBIF_STP) != 0 && 1673 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1674 m_freem(m); 1675 bridge_release_member(sc, bif, &psref); 1676 goto out; 1677 } 1678 1679 bridge_release_member(sc, bif, &psref); 1680 1681 /* 1682 * At this point, the port either doesn't participate 1683 * in spanning tree or it is in the forwarding state. 1684 */ 1685 1686 /* 1687 * If the packet is unicast, destined for someone on 1688 * "this" side of the bridge, drop it. 1689 */ 1690 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1691 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1692 if (src_if == dst_if) { 1693 m_freem(m); 1694 goto out; 1695 } 1696 } else { 1697 /* ...forward it to all interfaces. */ 1698 sc->sc_if.if_imcasts++; 1699 dst_if = NULL; 1700 } 1701 1702 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1703 if (m != NULL) 1704 m_freem(m); 1705 goto out; 1706 } 1707 if (m == NULL) 1708 goto out; 1709 1710 if (dst_if == NULL) { 1711 bridge_broadcast(sc, src_if, m); 1712 goto out; 1713 } 1714 1715 m_put_rcvif_psref(src_if, &psref_src); 1716 src_if = NULL; 1717 1718 /* 1719 * At this point, we're dealing with a unicast frame 1720 * going to a different interface. 1721 */ 1722 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1723 m_freem(m); 1724 goto out; 1725 } 1726 1727 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1728 if (bif == NULL) { 1729 /* Not a member of the bridge (anymore?) */ 1730 m_freem(m); 1731 goto out; 1732 } 1733 1734 if (bif->bif_flags & IFBIF_STP) { 1735 switch (bif->bif_state) { 1736 case BSTP_IFSTATE_DISABLED: 1737 case BSTP_IFSTATE_BLOCKING: 1738 m_freem(m); 1739 bridge_release_member(sc, bif, &psref); 1740 goto out; 1741 } 1742 } 1743 1744 bridge_release_member(sc, bif, &psref); 1745 1746 ACQUIRE_GLOBAL_LOCKS(); 1747 bridge_enqueue(sc, dst_if, m, 1); 1748 RELEASE_GLOBAL_LOCKS(); 1749 out: 1750 if (src_if != NULL) 1751 m_put_rcvif_psref(src_if, &psref_src); 1752 return; 1753 } 1754 1755 static bool 1756 bstp_state_before_learning(struct bridge_iflist *bif) 1757 { 1758 if (bif->bif_flags & IFBIF_STP) { 1759 switch (bif->bif_state) { 1760 case BSTP_IFSTATE_BLOCKING: 1761 case BSTP_IFSTATE_LISTENING: 1762 case BSTP_IFSTATE_DISABLED: 1763 return true; 1764 } 1765 } 1766 return false; 1767 } 1768 1769 static bool 1770 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1771 { 1772 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1773 1774 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1775 #if NCARP > 0 1776 || (bif->bif_ifp->if_carp && 1777 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1778 #endif /* NCARP > 0 */ 1779 ) 1780 return true; 1781 1782 return false; 1783 } 1784 1785 /* 1786 * bridge_input: 1787 * 1788 * Receive input from a member interface. Queue the packet for 1789 * bridging if it is not for us. 1790 */ 1791 static void 1792 bridge_input(struct ifnet *ifp, struct mbuf *m) 1793 { 1794 struct bridge_softc *sc = ifp->if_bridge; 1795 struct bridge_iflist *bif; 1796 struct ether_header *eh; 1797 struct psref psref; 1798 DECLARE_LOCK_VARIABLE; 1799 1800 KASSERT(!cpu_intr_p()); 1801 1802 if (__predict_false(sc == NULL) || 1803 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1804 ACQUIRE_GLOBAL_LOCKS(); 1805 ether_input(ifp, m); 1806 RELEASE_GLOBAL_LOCKS(); 1807 return; 1808 } 1809 1810 bif = bridge_lookup_member_if(sc, ifp, &psref); 1811 if (bif == NULL) { 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 if (_ifp != NULL) { 1864 m->m_flags &= ~M_PROMISC; 1865 ACQUIRE_GLOBAL_LOCKS(); 1866 ether_input(_ifp, m); 1867 RELEASE_GLOBAL_LOCKS(); 1868 } else 1869 m_freem(m); 1870 return; 1871 } 1872 } 1873 1874 /* Tap off 802.1D packets; they do not get forwarded. */ 1875 if (bif->bif_flags & IFBIF_STP && 1876 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1877 bstp_input(sc, bif, m); 1878 bridge_release_member(sc, bif, &psref); 1879 return; 1880 } 1881 1882 /* 1883 * A normal switch would discard the packet here, but that's not what 1884 * we've done historically. This also prevents some obnoxious behaviour. 1885 */ 1886 if (bstp_state_before_learning(bif)) { 1887 bridge_release_member(sc, bif, &psref); 1888 ACQUIRE_GLOBAL_LOCKS(); 1889 ether_input(ifp, m); 1890 RELEASE_GLOBAL_LOCKS(); 1891 return; 1892 } 1893 1894 bridge_release_member(sc, bif, &psref); 1895 1896 bridge_forward(sc, m); 1897 } 1898 1899 /* 1900 * bridge_broadcast: 1901 * 1902 * Send a frame to all interfaces that are members of 1903 * the bridge, except for the one on which the packet 1904 * arrived. 1905 */ 1906 static void 1907 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1908 struct mbuf *m) 1909 { 1910 struct bridge_iflist *bif; 1911 struct mbuf *mc; 1912 struct ifnet *dst_if; 1913 bool bmcast; 1914 int s; 1915 DECLARE_LOCK_VARIABLE; 1916 1917 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1918 1919 BRIDGE_PSZ_RENTER(s); 1920 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1921 struct psref psref; 1922 1923 bridge_acquire_member(sc, bif, &psref); 1924 BRIDGE_PSZ_REXIT(s); 1925 1926 dst_if = bif->bif_ifp; 1927 1928 if (bif->bif_flags & IFBIF_STP) { 1929 switch (bif->bif_state) { 1930 case BSTP_IFSTATE_BLOCKING: 1931 case BSTP_IFSTATE_DISABLED: 1932 goto next; 1933 } 1934 } 1935 1936 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1937 goto next; 1938 1939 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1940 goto next; 1941 1942 if (dst_if != src_if) { 1943 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1944 if (mc == NULL) { 1945 sc->sc_if.if_oerrors++; 1946 goto next; 1947 } 1948 ACQUIRE_GLOBAL_LOCKS(); 1949 bridge_enqueue(sc, dst_if, mc, 1); 1950 RELEASE_GLOBAL_LOCKS(); 1951 } 1952 1953 if (bmcast) { 1954 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1955 if (mc == NULL) { 1956 sc->sc_if.if_oerrors++; 1957 goto next; 1958 } 1959 1960 m_set_rcvif(mc, dst_if); 1961 mc->m_flags &= ~M_PROMISC; 1962 1963 ACQUIRE_GLOBAL_LOCKS(); 1964 ether_input(dst_if, mc); 1965 RELEASE_GLOBAL_LOCKS(); 1966 } 1967 next: 1968 BRIDGE_PSZ_RENTER(s); 1969 bridge_release_member(sc, bif, &psref); 1970 } 1971 BRIDGE_PSZ_REXIT(s); 1972 1973 m_freem(m); 1974 } 1975 1976 static int 1977 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1978 struct bridge_rtnode **brtp) 1979 { 1980 struct bridge_rtnode *brt; 1981 int error; 1982 1983 if (sc->sc_brtcnt >= sc->sc_brtmax) 1984 return ENOSPC; 1985 1986 /* 1987 * Allocate a new bridge forwarding node, and 1988 * initialize the expiration time and Ethernet 1989 * address. 1990 */ 1991 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1992 if (brt == NULL) 1993 return ENOMEM; 1994 1995 memset(brt, 0, sizeof(*brt)); 1996 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1997 brt->brt_flags = IFBAF_DYNAMIC; 1998 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1999 2000 BRIDGE_RT_LOCK(sc); 2001 error = bridge_rtnode_insert(sc, brt); 2002 BRIDGE_RT_UNLOCK(sc); 2003 2004 if (error != 0) { 2005 pool_put(&bridge_rtnode_pool, brt); 2006 return error; 2007 } 2008 2009 *brtp = brt; 2010 return 0; 2011 } 2012 2013 /* 2014 * bridge_rtupdate: 2015 * 2016 * Add a bridge routing entry. 2017 */ 2018 static int 2019 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2020 struct ifnet *dst_if, int setflags, uint8_t flags) 2021 { 2022 struct bridge_rtnode *brt; 2023 int s; 2024 2025 again: 2026 /* 2027 * A route for this destination might already exist. If so, 2028 * update it, otherwise create a new one. 2029 */ 2030 BRIDGE_RT_RENTER(s); 2031 brt = bridge_rtnode_lookup(sc, dst); 2032 2033 if (brt != NULL) { 2034 brt->brt_ifp = dst_if; 2035 if (setflags) { 2036 brt->brt_flags = flags; 2037 if (flags & IFBAF_STATIC) 2038 brt->brt_expire = 0; 2039 else 2040 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2041 } else { 2042 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2043 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2044 } 2045 } 2046 BRIDGE_RT_REXIT(s); 2047 2048 if (brt == NULL) { 2049 int r; 2050 2051 r = bridge_rtalloc(sc, dst, &brt); 2052 if (r != 0) 2053 return r; 2054 goto again; 2055 } 2056 2057 return 0; 2058 } 2059 2060 /* 2061 * bridge_rtlookup: 2062 * 2063 * Lookup the destination interface for an address. 2064 */ 2065 static struct ifnet * 2066 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2067 { 2068 struct bridge_rtnode *brt; 2069 struct ifnet *ifs = NULL; 2070 int s; 2071 2072 BRIDGE_RT_RENTER(s); 2073 brt = bridge_rtnode_lookup(sc, addr); 2074 if (brt != NULL) 2075 ifs = brt->brt_ifp; 2076 BRIDGE_RT_REXIT(s); 2077 2078 return ifs; 2079 } 2080 2081 typedef bool (*bridge_iterate_cb_t) 2082 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2083 2084 /* 2085 * bridge_rtlist_iterate_remove: 2086 * 2087 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2088 * callback judges to remove. Removals of rtnodes are done in a manner 2089 * of pserialize. To this end, all kmem_* operations are placed out of 2090 * mutexes. 2091 */ 2092 static void 2093 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2094 { 2095 struct bridge_rtnode *brt, *nbrt; 2096 struct bridge_rtnode **brt_list; 2097 int i, count; 2098 2099 retry: 2100 count = sc->sc_brtcnt; 2101 if (count == 0) 2102 return; 2103 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2104 2105 BRIDGE_RT_LOCK(sc); 2106 if (__predict_false(sc->sc_brtcnt > count)) { 2107 /* The rtnodes increased, we need more memory */ 2108 BRIDGE_RT_UNLOCK(sc); 2109 kmem_free(brt_list, sizeof(*brt_list) * count); 2110 goto retry; 2111 } 2112 2113 i = 0; 2114 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2115 bool need_break = false; 2116 if (func(sc, brt, &need_break, arg)) { 2117 bridge_rtnode_remove(sc, brt); 2118 brt_list[i++] = brt; 2119 } 2120 if (need_break) 2121 break; 2122 } 2123 2124 if (i > 0) 2125 BRIDGE_RT_PSZ_PERFORM(sc); 2126 BRIDGE_RT_UNLOCK(sc); 2127 2128 while (--i >= 0) 2129 bridge_rtnode_destroy(brt_list[i]); 2130 2131 kmem_free(brt_list, sizeof(*brt_list) * count); 2132 } 2133 2134 static bool 2135 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2136 bool *need_break, void *arg) 2137 { 2138 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2139 /* Take into account of the subsequent removal */ 2140 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2141 *need_break = true; 2142 return true; 2143 } else 2144 return false; 2145 } 2146 2147 static void 2148 bridge_rttrim0(struct bridge_softc *sc) 2149 { 2150 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2151 } 2152 2153 /* 2154 * bridge_rttrim: 2155 * 2156 * Trim the routine table so that we have a number 2157 * of routing entries less than or equal to the 2158 * maximum number. 2159 */ 2160 static void 2161 bridge_rttrim(struct bridge_softc *sc) 2162 { 2163 2164 /* Make sure we actually need to do this. */ 2165 if (sc->sc_brtcnt <= sc->sc_brtmax) 2166 return; 2167 2168 /* Force an aging cycle; this might trim enough addresses. */ 2169 bridge_rtage(sc); 2170 if (sc->sc_brtcnt <= sc->sc_brtmax) 2171 return; 2172 2173 bridge_rttrim0(sc); 2174 2175 return; 2176 } 2177 2178 /* 2179 * bridge_timer: 2180 * 2181 * Aging timer for the bridge. 2182 */ 2183 static void 2184 bridge_timer(void *arg) 2185 { 2186 struct bridge_softc *sc = arg; 2187 2188 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2189 } 2190 2191 static void 2192 bridge_rtage_work(struct work *wk, void *arg) 2193 { 2194 struct bridge_softc *sc = arg; 2195 2196 KASSERT(wk == &sc->sc_rtage_wk); 2197 2198 bridge_rtage(sc); 2199 2200 if (sc->sc_if.if_flags & IFF_RUNNING) 2201 callout_reset(&sc->sc_brcallout, 2202 bridge_rtable_prune_period * hz, bridge_timer, sc); 2203 } 2204 2205 static bool 2206 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2207 bool *need_break, void *arg) 2208 { 2209 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2210 time_uptime >= brt->brt_expire) 2211 return true; 2212 else 2213 return false; 2214 } 2215 2216 /* 2217 * bridge_rtage: 2218 * 2219 * Perform an aging cycle. 2220 */ 2221 static void 2222 bridge_rtage(struct bridge_softc *sc) 2223 { 2224 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2225 } 2226 2227 2228 static bool 2229 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2230 bool *need_break, void *arg) 2231 { 2232 int full = *(int*)arg; 2233 2234 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2235 return true; 2236 else 2237 return false; 2238 } 2239 2240 /* 2241 * bridge_rtflush: 2242 * 2243 * Remove all dynamic addresses from the bridge. 2244 */ 2245 static void 2246 bridge_rtflush(struct bridge_softc *sc, int full) 2247 { 2248 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2249 } 2250 2251 /* 2252 * bridge_rtdaddr: 2253 * 2254 * Remove an address from the table. 2255 */ 2256 static int 2257 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2258 { 2259 struct bridge_rtnode *brt; 2260 2261 BRIDGE_RT_LOCK(sc); 2262 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2263 BRIDGE_RT_UNLOCK(sc); 2264 return ENOENT; 2265 } 2266 bridge_rtnode_remove(sc, brt); 2267 BRIDGE_RT_PSZ_PERFORM(sc); 2268 BRIDGE_RT_UNLOCK(sc); 2269 2270 bridge_rtnode_destroy(brt); 2271 2272 return 0; 2273 } 2274 2275 /* 2276 * bridge_rtdelete: 2277 * 2278 * Delete routes to a speicifc member interface. 2279 */ 2280 static void 2281 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2282 { 2283 struct bridge_rtnode *brt; 2284 2285 BRIDGE_RT_LOCK(sc); 2286 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2287 if (brt->brt_ifp == ifp) 2288 break; 2289 } 2290 if (brt == NULL) { 2291 BRIDGE_RT_UNLOCK(sc); 2292 return; 2293 } 2294 bridge_rtnode_remove(sc, brt); 2295 BRIDGE_RT_PSZ_PERFORM(sc); 2296 BRIDGE_RT_UNLOCK(sc); 2297 2298 bridge_rtnode_destroy(brt); 2299 } 2300 2301 /* 2302 * bridge_rtable_init: 2303 * 2304 * Initialize the route table for this bridge. 2305 */ 2306 static void 2307 bridge_rtable_init(struct bridge_softc *sc) 2308 { 2309 int i; 2310 2311 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2312 KM_SLEEP); 2313 2314 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2315 LIST_INIT(&sc->sc_rthash[i]); 2316 2317 sc->sc_rthash_key = cprng_fast32(); 2318 2319 LIST_INIT(&sc->sc_rtlist); 2320 2321 sc->sc_rtlist_psz = pserialize_create(); 2322 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2323 } 2324 2325 /* 2326 * bridge_rtable_fini: 2327 * 2328 * Deconstruct the route table for this bridge. 2329 */ 2330 static void 2331 bridge_rtable_fini(struct bridge_softc *sc) 2332 { 2333 2334 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2335 if (sc->sc_rtlist_lock) 2336 mutex_obj_free(sc->sc_rtlist_lock); 2337 if (sc->sc_rtlist_psz) 2338 pserialize_destroy(sc->sc_rtlist_psz); 2339 } 2340 2341 /* 2342 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2343 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2344 */ 2345 #define mix(a, b, c) \ 2346 do { \ 2347 a -= b; a -= c; a ^= (c >> 13); \ 2348 b -= c; b -= a; b ^= (a << 8); \ 2349 c -= a; c -= b; c ^= (b >> 13); \ 2350 a -= b; a -= c; a ^= (c >> 12); \ 2351 b -= c; b -= a; b ^= (a << 16); \ 2352 c -= a; c -= b; c ^= (b >> 5); \ 2353 a -= b; a -= c; a ^= (c >> 3); \ 2354 b -= c; b -= a; b ^= (a << 10); \ 2355 c -= a; c -= b; c ^= (b >> 15); \ 2356 } while (/*CONSTCOND*/0) 2357 2358 static inline uint32_t 2359 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2360 { 2361 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2362 2363 b += addr[5] << 8; 2364 b += addr[4]; 2365 a += addr[3] << 24; 2366 a += addr[2] << 16; 2367 a += addr[1] << 8; 2368 a += addr[0]; 2369 2370 mix(a, b, c); 2371 2372 return (c & BRIDGE_RTHASH_MASK); 2373 } 2374 2375 #undef mix 2376 2377 /* 2378 * bridge_rtnode_lookup: 2379 * 2380 * Look up a bridge route node for the specified destination. 2381 */ 2382 static struct bridge_rtnode * 2383 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2384 { 2385 struct bridge_rtnode *brt; 2386 uint32_t hash; 2387 int dir; 2388 2389 hash = bridge_rthash(sc, addr); 2390 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2391 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2392 if (dir == 0) 2393 return (brt); 2394 if (dir > 0) 2395 return (NULL); 2396 } 2397 2398 return (NULL); 2399 } 2400 2401 /* 2402 * bridge_rtnode_insert: 2403 * 2404 * Insert the specified bridge node into the route table. We 2405 * assume the entry is not already in the table. 2406 */ 2407 static int 2408 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2409 { 2410 struct bridge_rtnode *lbrt; 2411 uint32_t hash; 2412 int dir; 2413 2414 KASSERT(BRIDGE_RT_LOCKED(sc)); 2415 2416 hash = bridge_rthash(sc, brt->brt_addr); 2417 2418 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2419 if (lbrt == NULL) { 2420 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2421 goto out; 2422 } 2423 2424 do { 2425 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2426 if (dir == 0) 2427 return (EEXIST); 2428 if (dir > 0) { 2429 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2430 goto out; 2431 } 2432 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2433 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2434 goto out; 2435 } 2436 lbrt = LIST_NEXT(lbrt, brt_hash); 2437 } while (lbrt != NULL); 2438 2439 #ifdef DIAGNOSTIC 2440 panic("bridge_rtnode_insert: impossible"); 2441 #endif 2442 2443 out: 2444 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2445 sc->sc_brtcnt++; 2446 2447 return (0); 2448 } 2449 2450 /* 2451 * bridge_rtnode_remove: 2452 * 2453 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2454 */ 2455 static void 2456 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2457 { 2458 2459 KASSERT(BRIDGE_RT_LOCKED(sc)); 2460 2461 LIST_REMOVE(brt, brt_hash); 2462 LIST_REMOVE(brt, brt_list); 2463 sc->sc_brtcnt--; 2464 } 2465 2466 /* 2467 * bridge_rtnode_destroy: 2468 * 2469 * Destroy a bridge rtnode. 2470 */ 2471 static void 2472 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2473 { 2474 2475 pool_put(&bridge_rtnode_pool, brt); 2476 } 2477 2478 #if defined(BRIDGE_IPF) 2479 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2480 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2481 2482 /* 2483 * Send bridge packets through IPF if they are one of the types IPF can deal 2484 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2485 * question.) 2486 */ 2487 static int 2488 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2489 { 2490 int snap, error; 2491 struct ether_header *eh1, eh2; 2492 struct llc llc1; 2493 uint16_t ether_type; 2494 2495 snap = 0; 2496 error = -1; /* Default error if not error == 0 */ 2497 eh1 = mtod(*mp, struct ether_header *); 2498 ether_type = ntohs(eh1->ether_type); 2499 2500 /* 2501 * Check for SNAP/LLC. 2502 */ 2503 if (ether_type < ETHERMTU) { 2504 struct llc *llc2 = (struct llc *)(eh1 + 1); 2505 2506 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2507 llc2->llc_dsap == LLC_SNAP_LSAP && 2508 llc2->llc_ssap == LLC_SNAP_LSAP && 2509 llc2->llc_control == LLC_UI) { 2510 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2511 snap = 1; 2512 } 2513 } 2514 2515 /* 2516 * If we're trying to filter bridge traffic, don't look at anything 2517 * other than IP and ARP traffic. If the filter doesn't understand 2518 * IPv6, don't allow IPv6 through the bridge either. This is lame 2519 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2520 * but of course we don't have an AppleTalk filter to begin with. 2521 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2522 * ARP traffic.) 2523 */ 2524 switch (ether_type) { 2525 case ETHERTYPE_ARP: 2526 case ETHERTYPE_REVARP: 2527 return 0; /* Automatically pass */ 2528 case ETHERTYPE_IP: 2529 # ifdef INET6 2530 case ETHERTYPE_IPV6: 2531 # endif /* INET6 */ 2532 break; 2533 default: 2534 goto bad; 2535 } 2536 2537 /* Strip off the Ethernet header and keep a copy. */ 2538 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2539 m_adj(*mp, ETHER_HDR_LEN); 2540 2541 /* Strip off snap header, if present */ 2542 if (snap) { 2543 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2544 m_adj(*mp, sizeof(struct llc)); 2545 } 2546 2547 /* 2548 * Check basic packet sanity and run IPF through pfil. 2549 */ 2550 KASSERT(!cpu_intr_p()); 2551 switch (ether_type) 2552 { 2553 case ETHERTYPE_IP : 2554 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2555 if (error == 0) 2556 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2557 break; 2558 # ifdef INET6 2559 case ETHERTYPE_IPV6 : 2560 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2561 if (error == 0) 2562 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2563 break; 2564 # endif 2565 default : 2566 error = 0; 2567 break; 2568 } 2569 2570 if (*mp == NULL) 2571 return error; 2572 if (error != 0) 2573 goto bad; 2574 2575 error = -1; 2576 2577 /* 2578 * Finally, put everything back the way it was and return 2579 */ 2580 if (snap) { 2581 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2582 if (*mp == NULL) 2583 return error; 2584 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2585 } 2586 2587 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2588 if (*mp == NULL) 2589 return error; 2590 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2591 2592 return 0; 2593 2594 bad: 2595 m_freem(*mp); 2596 *mp = NULL; 2597 return error; 2598 } 2599 2600 /* 2601 * Perform basic checks on header size since 2602 * IPF assumes ip_input has already processed 2603 * it for it. Cut-and-pasted from ip_input.c. 2604 * Given how simple the IPv6 version is, 2605 * does the IPv4 version really need to be 2606 * this complicated? 2607 * 2608 * XXX Should we update ipstat here, or not? 2609 * XXX Right now we update ipstat but not 2610 * XXX csum_counter. 2611 */ 2612 static int 2613 bridge_ip_checkbasic(struct mbuf **mp) 2614 { 2615 struct mbuf *m = *mp; 2616 struct ip *ip; 2617 int len, hlen; 2618 2619 if (*mp == NULL) 2620 return -1; 2621 2622 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2623 if ((m = m_copyup(m, sizeof(struct ip), 2624 (max_linkhdr + 3) & ~3)) == NULL) { 2625 /* XXXJRT new stat, please */ 2626 ip_statinc(IP_STAT_TOOSMALL); 2627 goto bad; 2628 } 2629 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2630 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2631 ip_statinc(IP_STAT_TOOSMALL); 2632 goto bad; 2633 } 2634 } 2635 ip = mtod(m, struct ip *); 2636 if (ip == NULL) goto bad; 2637 2638 if (ip->ip_v != IPVERSION) { 2639 ip_statinc(IP_STAT_BADVERS); 2640 goto bad; 2641 } 2642 hlen = ip->ip_hl << 2; 2643 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2644 ip_statinc(IP_STAT_BADHLEN); 2645 goto bad; 2646 } 2647 if (hlen > m->m_len) { 2648 if ((m = m_pullup(m, hlen)) == 0) { 2649 ip_statinc(IP_STAT_BADHLEN); 2650 goto bad; 2651 } 2652 ip = mtod(m, struct ip *); 2653 if (ip == NULL) goto bad; 2654 } 2655 2656 switch (m->m_pkthdr.csum_flags & 2657 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2658 M_CSUM_IPv4_BAD)) { 2659 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2660 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2661 goto bad; 2662 2663 case M_CSUM_IPv4: 2664 /* Checksum was okay. */ 2665 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2666 break; 2667 2668 default: 2669 /* Must compute it ourselves. */ 2670 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2671 if (in_cksum(m, hlen) != 0) 2672 goto bad; 2673 break; 2674 } 2675 2676 /* Retrieve the packet length. */ 2677 len = ntohs(ip->ip_len); 2678 2679 /* 2680 * Check for additional length bogosity 2681 */ 2682 if (len < hlen) { 2683 ip_statinc(IP_STAT_BADLEN); 2684 goto bad; 2685 } 2686 2687 /* 2688 * Check that the amount of data in the buffers 2689 * is as at least much as the IP header would have us expect. 2690 * Drop packet if shorter than we expect. 2691 */ 2692 if (m->m_pkthdr.len < len) { 2693 ip_statinc(IP_STAT_TOOSHORT); 2694 goto bad; 2695 } 2696 2697 /* Checks out, proceed */ 2698 *mp = m; 2699 return 0; 2700 2701 bad: 2702 *mp = m; 2703 return -1; 2704 } 2705 2706 # ifdef INET6 2707 /* 2708 * Same as above, but for IPv6. 2709 * Cut-and-pasted from ip6_input.c. 2710 * XXX Should we update ip6stat, or not? 2711 */ 2712 static int 2713 bridge_ip6_checkbasic(struct mbuf **mp) 2714 { 2715 struct mbuf *m = *mp; 2716 struct ip6_hdr *ip6; 2717 2718 /* 2719 * If the IPv6 header is not aligned, slurp it up into a new 2720 * mbuf with space for link headers, in the event we forward 2721 * it. Otherwise, if it is aligned, make sure the entire base 2722 * IPv6 header is in the first mbuf of the chain. 2723 */ 2724 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2725 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2726 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2727 (max_linkhdr + 3) & ~3)) == NULL) { 2728 /* XXXJRT new stat, please */ 2729 ip6_statinc(IP6_STAT_TOOSMALL); 2730 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2731 goto bad; 2732 } 2733 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2734 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2735 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2736 ip6_statinc(IP6_STAT_TOOSMALL); 2737 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2738 goto bad; 2739 } 2740 } 2741 2742 ip6 = mtod(m, struct ip6_hdr *); 2743 2744 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2745 ip6_statinc(IP6_STAT_BADVERS); 2746 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2747 goto bad; 2748 } 2749 2750 /* Checks out, proceed */ 2751 *mp = m; 2752 return 0; 2753 2754 bad: 2755 *mp = m; 2756 return -1; 2757 } 2758 # endif /* INET6 */ 2759 #endif /* BRIDGE_IPF */ 2760
Indexes created Fri Oct 03 02:09:57 GMT 2025