if_bridge.c revision 1.134.6.6
1 /* $NetBSD: if_bridge.c,v 1.134.6.6 2018/01/16 13:01:10 martin Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.134.6.6 2018/01/16 13:01:10 martin Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_net_mpsafe.h" 89 #endif /* _KERNEL_OPT */ 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> /* for softnet_lock */ 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 #include <sys/kauth.h> 102 #include <sys/cpu.h> 103 #include <sys/cprng.h> 104 #include <sys/mutex.h> 105 #include <sys/kmem.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_llc.h> 112 113 #include <net/if_ether.h> 114 #include <net/if_bridgevar.h> 115 116 #if defined(BRIDGE_IPF) 117 /* Used for bridge_ip[6]_checkbasic */ 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #include <netinet/ip_private.h> /* XXX */ 123 124 #include <netinet/ip6.h> 125 #include <netinet6/in6_var.h> 126 #include <netinet6/ip6_var.h> 127 #include <netinet6/ip6_private.h> /* XXX */ 128 #endif /* BRIDGE_IPF */ 129 130 /* 131 * Size of the route hash table. Must be a power of two. 132 */ 133 #ifndef BRIDGE_RTHASH_SIZE 134 #define BRIDGE_RTHASH_SIZE 1024 135 #endif 136 137 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 138 139 #include "carp.h" 140 #if NCARP > 0 141 #include <netinet/in.h> 142 #include <netinet/in_var.h> 143 #include <netinet/ip_carp.h> 144 #endif 145 146 #include "ioconf.h" 147 148 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 149 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 150 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 151 152 /* 153 * Maximum number of addresses to cache. 154 */ 155 #ifndef BRIDGE_RTABLE_MAX 156 #define BRIDGE_RTABLE_MAX 100 157 #endif 158 159 /* 160 * Spanning tree defaults. 161 */ 162 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 163 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 164 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 165 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 166 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 167 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 168 #define BSTP_DEFAULT_PATH_COST 55 169 170 /* 171 * Timeout (in seconds) for entries learned dynamically. 172 */ 173 #ifndef BRIDGE_RTABLE_TIMEOUT 174 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 175 #endif 176 177 /* 178 * Number of seconds between walks of the route list. 179 */ 180 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 181 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 182 #endif 183 184 #define BRIDGE_RT_LOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 185 mutex_enter((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 187 mutex_exit((_sc)->sc_rtlist_lock) 188 #define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \ 189 mutex_owned((_sc)->sc_rtlist_lock)) 190 191 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 192 if ((_sc)->sc_rtlist_psz != NULL) \ 193 pserialize_perform((_sc)->sc_rtlist_psz); 194 195 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 196 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 197 198 199 #ifdef NET_MPSAFE 200 #define DECLARE_LOCK_VARIABLE 201 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 202 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 203 #else 204 #define DECLARE_LOCK_VARIABLE int __s 205 #define ACQUIRE_GLOBAL_LOCKS() do { \ 206 KERNEL_LOCK(1, NULL); \ 207 mutex_enter(softnet_lock); \ 208 __s = splsoftnet(); \ 209 } while (0) 210 #define RELEASE_GLOBAL_LOCKS() do { \ 211 splx(__s); \ 212 mutex_exit(softnet_lock); \ 213 KERNEL_UNLOCK_ONE(NULL); \ 214 } while (0) 215 #endif 216 217 struct psref_class *bridge_psref_class __read_mostly; 218 219 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 220 221 static struct pool bridge_rtnode_pool; 222 223 static int bridge_clone_create(struct if_clone *, int); 224 static int bridge_clone_destroy(struct ifnet *); 225 226 static int bridge_ioctl(struct ifnet *, u_long, void *); 227 static int bridge_init(struct ifnet *); 228 static void bridge_stop(struct ifnet *, int); 229 static void bridge_start(struct ifnet *); 230 231 static void bridge_input(struct ifnet *, struct mbuf *); 232 static void bridge_forward(struct bridge_softc *, struct mbuf *); 233 234 static void bridge_timer(void *); 235 236 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 237 struct mbuf *); 238 239 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 240 struct ifnet *, int, uint8_t); 241 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 242 static void bridge_rttrim(struct bridge_softc *); 243 static void bridge_rtage(struct bridge_softc *); 244 static void bridge_rtage_work(struct work *, void *); 245 static void bridge_rtflush(struct bridge_softc *, int); 246 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 247 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 248 249 static void bridge_rtable_init(struct bridge_softc *); 250 static void bridge_rtable_fini(struct bridge_softc *); 251 252 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 253 const uint8_t *); 254 static int bridge_rtnode_insert(struct bridge_softc *, 255 struct bridge_rtnode *); 256 static void bridge_rtnode_remove(struct bridge_softc *, 257 struct bridge_rtnode *); 258 static void bridge_rtnode_destroy(struct bridge_rtnode *); 259 260 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 261 const char *name, 262 struct psref *); 263 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 264 struct ifnet *ifp, 265 struct psref *); 266 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 267 struct psref *); 268 static void bridge_delete_member(struct bridge_softc *, 269 struct bridge_iflist *); 270 static void bridge_acquire_member(struct bridge_softc *sc, 271 struct bridge_iflist *, 272 struct psref *); 273 274 static int bridge_ioctl_add(struct bridge_softc *, void *); 275 static int bridge_ioctl_del(struct bridge_softc *, void *); 276 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 277 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 278 static int bridge_ioctl_scache(struct bridge_softc *, void *); 279 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 280 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 281 static int bridge_ioctl_rts(struct bridge_softc *, void *); 282 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 283 static int bridge_ioctl_sto(struct bridge_softc *, void *); 284 static int bridge_ioctl_gto(struct bridge_softc *, void *); 285 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 286 static int bridge_ioctl_flush(struct bridge_softc *, void *); 287 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 288 static int bridge_ioctl_spri(struct bridge_softc *, void *); 289 static int bridge_ioctl_ght(struct bridge_softc *, void *); 290 static int bridge_ioctl_sht(struct bridge_softc *, void *); 291 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 292 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 293 static int bridge_ioctl_gma(struct bridge_softc *, void *); 294 static int bridge_ioctl_sma(struct bridge_softc *, void *); 295 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 297 #if defined(BRIDGE_IPF) 298 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 299 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 300 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 301 static int bridge_ip_checkbasic(struct mbuf **mp); 302 # ifdef INET6 303 static int bridge_ip6_checkbasic(struct mbuf **mp); 304 # endif /* INET6 */ 305 #endif /* BRIDGE_IPF */ 306 307 struct bridge_control { 308 int (*bc_func)(struct bridge_softc *, void *); 309 int bc_argsize; 310 int bc_flags; 311 }; 312 313 #define BC_F_COPYIN 0x01 /* copy arguments in */ 314 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 315 #define BC_F_SUSER 0x04 /* do super-user check */ 316 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 317 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 318 319 static const struct bridge_control bridge_control_table[] = { 320 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 321 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 322 323 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 324 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 325 326 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 327 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 328 329 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 330 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 331 332 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 333 334 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 335 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 336 337 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 338 339 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 343 344 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 345 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 350 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 351 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 354 355 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 356 #if defined(BRIDGE_IPF) 357 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 358 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 359 #endif /* BRIDGE_IPF */ 360 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 361 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 362 }; 363 364 static const int bridge_control_table_size = __arraycount(bridge_control_table); 365 366 static struct if_clone bridge_cloner = 367 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 368 369 /* 370 * bridgeattach: 371 * 372 * Pseudo-device attach routine. 373 */ 374 void 375 bridgeattach(int n) 376 { 377 378 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 379 0, 0, 0, "brtpl", NULL, IPL_NET); 380 381 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 382 383 if_clone_attach(&bridge_cloner); 384 } 385 386 /* 387 * bridge_clone_create: 388 * 389 * Create a new bridge instance. 390 */ 391 static int 392 bridge_clone_create(struct if_clone *ifc, int unit) 393 { 394 struct bridge_softc *sc; 395 struct ifnet *ifp; 396 int error; 397 398 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 399 ifp = &sc->sc_if; 400 401 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 402 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 403 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 404 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 405 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 406 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 407 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 408 sc->sc_filter_flags = 0; 409 410 /* Initialize our routing table. */ 411 bridge_rtable_init(sc); 412 413 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 414 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 415 if (error) 416 panic("%s: workqueue_create %d\n", __func__, error); 417 418 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 419 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 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_NO_LINK_STATE_CHANGE; 428 #ifdef NET_MPSAFE 429 ifp->if_extflags |= IFEF_MPSAFE; 430 #endif 431 ifp->if_mtu = ETHERMTU; 432 ifp->if_ioctl = bridge_ioctl; 433 ifp->if_output = bridge_output; 434 ifp->if_start = bridge_start; 435 ifp->if_stop = bridge_stop; 436 ifp->if_init = bridge_init; 437 ifp->if_type = IFT_BRIDGE; 438 ifp->if_addrlen = 0; 439 ifp->if_dlt = DLT_EN10MB; 440 ifp->if_hdrlen = ETHER_HDR_LEN; 441 442 error = if_initialize(ifp); 443 if (error != 0) { 444 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 445 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 446 callout_destroy(&sc->sc_brcallout); 447 callout_destroy(&sc->sc_bstpcallout); 448 workqueue_destroy(sc->sc_rtage_wq); 449 bridge_rtable_fini(sc); 450 kmem_free(sc, sizeof(*sc)); 451 452 return error; 453 } 454 if_register(ifp); 455 456 if_alloc_sadl(ifp); 457 458 return 0; 459 } 460 461 /* 462 * bridge_clone_destroy: 463 * 464 * Destroy a bridge instance. 465 */ 466 static int 467 bridge_clone_destroy(struct ifnet *ifp) 468 { 469 struct bridge_softc *sc = ifp->if_softc; 470 struct bridge_iflist *bif; 471 int s; 472 473 s = splsoftnet(); 474 475 bridge_stop(ifp, 1); 476 477 BRIDGE_LOCK(sc); 478 for (;;) { 479 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 480 bif_next); 481 if (bif == NULL) 482 break; 483 bridge_delete_member(sc, bif); 484 } 485 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 486 BRIDGE_UNLOCK(sc); 487 488 splx(s); 489 490 if_detach(ifp); 491 492 /* Tear down the routing table. */ 493 bridge_rtable_fini(sc); 494 495 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 496 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 497 callout_destroy(&sc->sc_brcallout); 498 callout_destroy(&sc->sc_bstpcallout); 499 workqueue_destroy(sc->sc_rtage_wq); 500 kmem_free(sc, sizeof(*sc)); 501 502 return 0; 503 } 504 505 /* 506 * bridge_ioctl: 507 * 508 * Handle a control request from the operator. 509 */ 510 static int 511 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 512 { 513 struct bridge_softc *sc = ifp->if_softc; 514 struct lwp *l = curlwp; /* XXX */ 515 union { 516 struct ifbreq ifbreq; 517 struct ifbifconf ifbifconf; 518 struct ifbareq ifbareq; 519 struct ifbaconf ifbaconf; 520 struct ifbrparam ifbrparam; 521 } args; 522 struct ifdrv *ifd = (struct ifdrv *) data; 523 const struct bridge_control *bc = NULL; /* XXXGCC */ 524 int s, error = 0; 525 526 /* Authorize command before calling splsoftnet(). */ 527 switch (cmd) { 528 case SIOCGDRVSPEC: 529 case SIOCSDRVSPEC: 530 if (ifd->ifd_cmd >= bridge_control_table_size 531 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 532 error = EINVAL; 533 return error; 534 } 535 536 /* We only care about BC_F_SUSER at this point. */ 537 if ((bc->bc_flags & BC_F_SUSER) == 0) 538 break; 539 540 error = kauth_authorize_network(l->l_cred, 541 KAUTH_NETWORK_INTERFACE_BRIDGE, 542 cmd == SIOCGDRVSPEC ? 543 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 544 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 545 ifd, NULL, NULL); 546 if (error) 547 return error; 548 549 break; 550 } 551 552 s = splsoftnet(); 553 554 switch (cmd) { 555 case SIOCGDRVSPEC: 556 case SIOCSDRVSPEC: 557 KASSERT(bc != NULL); 558 if (cmd == SIOCGDRVSPEC && 559 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 560 error = EINVAL; 561 break; 562 } 563 else if (cmd == SIOCSDRVSPEC && 564 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 565 error = EINVAL; 566 break; 567 } 568 569 /* BC_F_SUSER is checked above, before splsoftnet(). */ 570 571 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 572 && (ifd->ifd_len != bc->bc_argsize 573 || ifd->ifd_len > sizeof(args))) { 574 error = EINVAL; 575 break; 576 } 577 578 memset(&args, 0, sizeof(args)); 579 if (bc->bc_flags & BC_F_COPYIN) { 580 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 581 if (error) 582 break; 583 } else if (bc->bc_flags & BC_F_XLATEIN) { 584 args.ifbifconf.ifbic_len = ifd->ifd_len; 585 args.ifbifconf.ifbic_buf = ifd->ifd_data; 586 } 587 588 error = (*bc->bc_func)(sc, &args); 589 if (error) 590 break; 591 592 if (bc->bc_flags & BC_F_COPYOUT) { 593 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 594 } else if (bc->bc_flags & BC_F_XLATEOUT) { 595 ifd->ifd_len = args.ifbifconf.ifbic_len; 596 ifd->ifd_data = args.ifbifconf.ifbic_buf; 597 } 598 break; 599 600 case SIOCSIFFLAGS: 601 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 602 break; 603 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 604 case IFF_RUNNING: 605 /* 606 * If interface is marked down and it is running, 607 * then stop and disable it. 608 */ 609 (*ifp->if_stop)(ifp, 1); 610 break; 611 case IFF_UP: 612 /* 613 * If interface is marked up and it is stopped, then 614 * start it. 615 */ 616 error = (*ifp->if_init)(ifp); 617 break; 618 default: 619 break; 620 } 621 break; 622 623 case SIOCSIFMTU: 624 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 625 error = 0; 626 break; 627 628 default: 629 error = ifioctl_common(ifp, cmd, data); 630 break; 631 } 632 633 splx(s); 634 635 return error; 636 } 637 638 /* 639 * bridge_lookup_member: 640 * 641 * Lookup a bridge member interface. 642 */ 643 static struct bridge_iflist * 644 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 645 { 646 struct bridge_iflist *bif; 647 struct ifnet *ifp; 648 int s; 649 650 BRIDGE_PSZ_RENTER(s); 651 652 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 653 ifp = bif->bif_ifp; 654 if (strcmp(ifp->if_xname, name) == 0) 655 break; 656 } 657 if (bif != NULL) 658 bridge_acquire_member(sc, bif, psref); 659 660 BRIDGE_PSZ_REXIT(s); 661 662 return bif; 663 } 664 665 /* 666 * bridge_lookup_member_if: 667 * 668 * Lookup a bridge member interface by ifnet*. 669 */ 670 static struct bridge_iflist * 671 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 672 struct psref *psref) 673 { 674 struct bridge_iflist *bif; 675 int s; 676 677 BRIDGE_PSZ_RENTER(s); 678 679 bif = member_ifp->if_bridgeif; 680 if (bif != NULL) { 681 psref_acquire(psref, &bif->bif_psref, 682 bridge_psref_class); 683 } 684 685 BRIDGE_PSZ_REXIT(s); 686 687 return bif; 688 } 689 690 static void 691 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 692 struct psref *psref) 693 { 694 695 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 696 } 697 698 /* 699 * bridge_release_member: 700 * 701 * Release the specified member interface. 702 */ 703 static void 704 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 705 struct psref *psref) 706 { 707 708 psref_release(psref, &bif->bif_psref, bridge_psref_class); 709 } 710 711 /* 712 * bridge_delete_member: 713 * 714 * Delete the specified member interface. 715 */ 716 static void 717 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 718 { 719 struct ifnet *ifs = bif->bif_ifp; 720 721 KASSERT(BRIDGE_LOCKED(sc)); 722 723 ifs->_if_input = ether_input; 724 ifs->if_bridge = NULL; 725 ifs->if_bridgeif = NULL; 726 727 PSLIST_WRITER_REMOVE(bif, bif_next); 728 BRIDGE_PSZ_PERFORM(sc); 729 BRIDGE_UNLOCK(sc); 730 731 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 732 733 PSLIST_ENTRY_DESTROY(bif, bif_next); 734 kmem_free(bif, sizeof(*bif)); 735 736 BRIDGE_LOCK(sc); 737 } 738 739 static int 740 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 741 { 742 struct ifbreq *req = arg; 743 struct bridge_iflist *bif = NULL; 744 struct ifnet *ifs; 745 int error = 0; 746 struct psref psref; 747 748 ifs = if_get(req->ifbr_ifsname, &psref); 749 if (ifs == NULL) 750 return ENOENT; 751 752 if (ifs->if_bridge == sc) { 753 error = EEXIST; 754 goto out; 755 } 756 757 if (ifs->if_bridge != NULL) { 758 error = EBUSY; 759 goto out; 760 } 761 762 if (ifs->_if_input != ether_input) { 763 error = EINVAL; 764 goto out; 765 } 766 767 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 768 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 769 error = EINVAL; 770 goto out; 771 } 772 773 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 774 775 switch (ifs->if_type) { 776 case IFT_ETHER: 777 if (sc->sc_if.if_mtu != ifs->if_mtu) { 778 error = EINVAL; 779 goto out; 780 } 781 /* FALLTHROUGH */ 782 case IFT_L2TP: 783 IFNET_LOCK(ifs); 784 error = ether_enable_vlan_mtu(ifs); 785 IFNET_UNLOCK(ifs); 786 if (error > 0) 787 goto out; 788 /* 789 * Place the interface into promiscuous mode. 790 */ 791 error = ifpromisc(ifs, 1); 792 if (error) 793 goto out; 794 break; 795 default: 796 error = EINVAL; 797 goto out; 798 } 799 800 bif->bif_ifp = ifs; 801 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 802 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 803 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 804 PSLIST_ENTRY_INIT(bif, bif_next); 805 psref_target_init(&bif->bif_psref, bridge_psref_class); 806 807 BRIDGE_LOCK(sc); 808 809 ifs->if_bridge = sc; 810 ifs->if_bridgeif = bif; 811 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 812 ifs->_if_input = bridge_input; 813 814 BRIDGE_UNLOCK(sc); 815 816 if (sc->sc_if.if_flags & IFF_RUNNING) 817 bstp_initialization(sc); 818 else 819 bstp_stop(sc); 820 821 out: 822 if_put(ifs, &psref); 823 if (error) { 824 if (bif != NULL) 825 kmem_free(bif, sizeof(*bif)); 826 } 827 return error; 828 } 829 830 static int 831 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 832 { 833 struct ifbreq *req = arg; 834 const char *name = req->ifbr_ifsname; 835 struct bridge_iflist *bif; 836 struct ifnet *ifs; 837 838 BRIDGE_LOCK(sc); 839 840 /* 841 * Don't use bridge_lookup_member. We want to get a member 842 * with bif_refs == 0. 843 */ 844 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 845 ifs = bif->bif_ifp; 846 if (strcmp(ifs->if_xname, name) == 0) 847 break; 848 } 849 850 if (bif == NULL) { 851 BRIDGE_UNLOCK(sc); 852 return ENOENT; 853 } 854 855 bridge_delete_member(sc, bif); 856 857 BRIDGE_UNLOCK(sc); 858 859 switch (ifs->if_type) { 860 case IFT_ETHER: 861 case IFT_L2TP: 862 /* 863 * Take the interface out of promiscuous mode. 864 * Don't call it with holding a spin lock. 865 */ 866 (void) ifpromisc(ifs, 0); 867 IFNET_LOCK(ifs); 868 (void) ether_disable_vlan_mtu(ifs); 869 IFNET_UNLOCK(ifs); 870 break; 871 default: 872 #ifdef DIAGNOSTIC 873 panic("bridge_delete_member: impossible"); 874 #endif 875 break; 876 } 877 878 bridge_rtdelete(sc, ifs); 879 880 if (sc->sc_if.if_flags & IFF_RUNNING) 881 bstp_initialization(sc); 882 883 return 0; 884 } 885 886 static int 887 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 888 { 889 struct ifbreq *req = arg; 890 struct bridge_iflist *bif; 891 struct psref psref; 892 893 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 894 if (bif == NULL) 895 return ENOENT; 896 897 req->ifbr_ifsflags = bif->bif_flags; 898 req->ifbr_state = bif->bif_state; 899 req->ifbr_priority = bif->bif_priority; 900 req->ifbr_path_cost = bif->bif_path_cost; 901 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 902 903 bridge_release_member(sc, bif, &psref); 904 905 return 0; 906 } 907 908 static int 909 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 910 { 911 struct ifbreq *req = arg; 912 struct bridge_iflist *bif; 913 struct psref psref; 914 915 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 916 if (bif == NULL) 917 return ENOENT; 918 919 if (req->ifbr_ifsflags & IFBIF_STP) { 920 switch (bif->bif_ifp->if_type) { 921 case IFT_ETHER: 922 case IFT_L2TP: 923 /* These can do spanning tree. */ 924 break; 925 926 default: 927 /* Nothing else can. */ 928 bridge_release_member(sc, bif, &psref); 929 return EINVAL; 930 } 931 } 932 933 bif->bif_flags = req->ifbr_ifsflags; 934 935 bridge_release_member(sc, bif, &psref); 936 937 if (sc->sc_if.if_flags & IFF_RUNNING) 938 bstp_initialization(sc); 939 940 return 0; 941 } 942 943 static int 944 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 945 { 946 struct ifbrparam *param = arg; 947 948 sc->sc_brtmax = param->ifbrp_csize; 949 bridge_rttrim(sc); 950 951 return 0; 952 } 953 954 static int 955 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 956 { 957 struct ifbrparam *param = arg; 958 959 param->ifbrp_csize = sc->sc_brtmax; 960 961 return 0; 962 } 963 964 static int 965 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 966 { 967 struct ifbifconf *bifc = arg; 968 struct bridge_iflist *bif; 969 struct ifbreq *breqs; 970 int i, count, error = 0; 971 972 retry: 973 BRIDGE_LOCK(sc); 974 count = 0; 975 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 976 count++; 977 BRIDGE_UNLOCK(sc); 978 979 if (count == 0) { 980 bifc->ifbic_len = 0; 981 return 0; 982 } 983 984 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 985 /* Tell that a larger buffer is needed */ 986 bifc->ifbic_len = sizeof(*breqs) * count; 987 return 0; 988 } 989 990 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 991 992 BRIDGE_LOCK(sc); 993 994 i = 0; 995 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 996 i++; 997 if (i > count) { 998 /* 999 * The number of members has been increased. 1000 * We need more memory! 1001 */ 1002 BRIDGE_UNLOCK(sc); 1003 kmem_free(breqs, sizeof(*breqs) * count); 1004 goto retry; 1005 } 1006 1007 i = 0; 1008 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1009 struct ifbreq *breq = &breqs[i++]; 1010 memset(breq, 0, sizeof(*breq)); 1011 1012 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1013 sizeof(breq->ifbr_ifsname)); 1014 breq->ifbr_ifsflags = bif->bif_flags; 1015 breq->ifbr_state = bif->bif_state; 1016 breq->ifbr_priority = bif->bif_priority; 1017 breq->ifbr_path_cost = bif->bif_path_cost; 1018 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1019 } 1020 1021 /* Don't call copyout with holding the mutex */ 1022 BRIDGE_UNLOCK(sc); 1023 1024 for (i = 0; i < count; i++) { 1025 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1026 if (error) 1027 break; 1028 } 1029 bifc->ifbic_len = sizeof(*breqs) * i; 1030 1031 kmem_free(breqs, sizeof(*breqs) * count); 1032 1033 return error; 1034 } 1035 1036 static int 1037 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1038 { 1039 struct ifbaconf *bac = arg; 1040 struct bridge_rtnode *brt; 1041 struct ifbareq bareq; 1042 int count = 0, error = 0, len; 1043 1044 if (bac->ifbac_len == 0) 1045 return 0; 1046 1047 BRIDGE_RT_LOCK(sc); 1048 1049 len = bac->ifbac_len; 1050 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1051 if (len < sizeof(bareq)) 1052 goto out; 1053 memset(&bareq, 0, sizeof(bareq)); 1054 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1055 sizeof(bareq.ifba_ifsname)); 1056 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1057 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1058 bareq.ifba_expire = brt->brt_expire - time_uptime; 1059 } else 1060 bareq.ifba_expire = 0; 1061 bareq.ifba_flags = brt->brt_flags; 1062 1063 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1064 if (error) 1065 goto out; 1066 count++; 1067 len -= sizeof(bareq); 1068 } 1069 out: 1070 BRIDGE_RT_UNLOCK(sc); 1071 1072 bac->ifbac_len = sizeof(bareq) * count; 1073 return error; 1074 } 1075 1076 static int 1077 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1078 { 1079 struct ifbareq *req = arg; 1080 struct bridge_iflist *bif; 1081 int error; 1082 struct psref psref; 1083 1084 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1085 if (bif == NULL) 1086 return ENOENT; 1087 1088 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1089 req->ifba_flags); 1090 1091 bridge_release_member(sc, bif, &psref); 1092 1093 return error; 1094 } 1095 1096 static int 1097 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1098 { 1099 struct ifbrparam *param = arg; 1100 1101 sc->sc_brttimeout = param->ifbrp_ctime; 1102 1103 return 0; 1104 } 1105 1106 static int 1107 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1108 { 1109 struct ifbrparam *param = arg; 1110 1111 param->ifbrp_ctime = sc->sc_brttimeout; 1112 1113 return 0; 1114 } 1115 1116 static int 1117 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1118 { 1119 struct ifbareq *req = arg; 1120 1121 return (bridge_rtdaddr(sc, req->ifba_dst)); 1122 } 1123 1124 static int 1125 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1126 { 1127 struct ifbreq *req = arg; 1128 1129 bridge_rtflush(sc, req->ifbr_ifsflags); 1130 1131 return 0; 1132 } 1133 1134 static int 1135 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1136 { 1137 struct ifbrparam *param = arg; 1138 1139 param->ifbrp_prio = sc->sc_bridge_priority; 1140 1141 return 0; 1142 } 1143 1144 static int 1145 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1146 { 1147 struct ifbrparam *param = arg; 1148 1149 sc->sc_bridge_priority = param->ifbrp_prio; 1150 1151 if (sc->sc_if.if_flags & IFF_RUNNING) 1152 bstp_initialization(sc); 1153 1154 return 0; 1155 } 1156 1157 static int 1158 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1159 { 1160 struct ifbrparam *param = arg; 1161 1162 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1163 1164 return 0; 1165 } 1166 1167 static int 1168 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1169 { 1170 struct ifbrparam *param = arg; 1171 1172 if (param->ifbrp_hellotime == 0) 1173 return EINVAL; 1174 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1175 1176 if (sc->sc_if.if_flags & IFF_RUNNING) 1177 bstp_initialization(sc); 1178 1179 return 0; 1180 } 1181 1182 static int 1183 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1184 { 1185 struct ifbrparam *param = arg; 1186 1187 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1188 1189 return 0; 1190 } 1191 1192 static int 1193 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1194 { 1195 struct ifbrparam *param = arg; 1196 1197 if (param->ifbrp_fwddelay == 0) 1198 return EINVAL; 1199 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1200 1201 if (sc->sc_if.if_flags & IFF_RUNNING) 1202 bstp_initialization(sc); 1203 1204 return 0; 1205 } 1206 1207 static int 1208 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1209 { 1210 struct ifbrparam *param = arg; 1211 1212 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1213 1214 return 0; 1215 } 1216 1217 static int 1218 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1219 { 1220 struct ifbrparam *param = arg; 1221 1222 if (param->ifbrp_maxage == 0) 1223 return EINVAL; 1224 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1225 1226 if (sc->sc_if.if_flags & IFF_RUNNING) 1227 bstp_initialization(sc); 1228 1229 return 0; 1230 } 1231 1232 static int 1233 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1234 { 1235 struct ifbreq *req = arg; 1236 struct bridge_iflist *bif; 1237 struct psref psref; 1238 1239 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1240 if (bif == NULL) 1241 return ENOENT; 1242 1243 bif->bif_priority = req->ifbr_priority; 1244 1245 if (sc->sc_if.if_flags & IFF_RUNNING) 1246 bstp_initialization(sc); 1247 1248 bridge_release_member(sc, bif, &psref); 1249 1250 return 0; 1251 } 1252 1253 #if defined(BRIDGE_IPF) 1254 static int 1255 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1256 { 1257 struct ifbrparam *param = arg; 1258 1259 param->ifbrp_filter = sc->sc_filter_flags; 1260 1261 return 0; 1262 } 1263 1264 static int 1265 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1266 { 1267 struct ifbrparam *param = arg; 1268 uint32_t nflags, oflags; 1269 1270 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1271 return EINVAL; 1272 1273 nflags = param->ifbrp_filter; 1274 oflags = sc->sc_filter_flags; 1275 1276 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1277 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1278 sc->sc_if.if_pfil); 1279 } 1280 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1281 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1282 sc->sc_if.if_pfil); 1283 } 1284 1285 sc->sc_filter_flags = nflags; 1286 1287 return 0; 1288 } 1289 #endif /* BRIDGE_IPF */ 1290 1291 static int 1292 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1293 { 1294 struct ifbreq *req = arg; 1295 struct bridge_iflist *bif; 1296 struct psref psref; 1297 1298 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1299 if (bif == NULL) 1300 return ENOENT; 1301 1302 bif->bif_path_cost = req->ifbr_path_cost; 1303 1304 if (sc->sc_if.if_flags & IFF_RUNNING) 1305 bstp_initialization(sc); 1306 1307 bridge_release_member(sc, bif, &psref); 1308 1309 return 0; 1310 } 1311 1312 /* 1313 * bridge_ifdetach: 1314 * 1315 * Detach an interface from a bridge. Called when a member 1316 * interface is detaching. 1317 */ 1318 void 1319 bridge_ifdetach(struct ifnet *ifp) 1320 { 1321 struct bridge_softc *sc = ifp->if_bridge; 1322 struct ifbreq breq; 1323 1324 /* ioctl_lock should prevent this from happening */ 1325 KASSERT(sc != NULL); 1326 1327 memset(&breq, 0, sizeof(breq)); 1328 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1329 1330 (void) bridge_ioctl_del(sc, &breq); 1331 } 1332 1333 /* 1334 * bridge_init: 1335 * 1336 * Initialize a bridge interface. 1337 */ 1338 static int 1339 bridge_init(struct ifnet *ifp) 1340 { 1341 struct bridge_softc *sc = ifp->if_softc; 1342 1343 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1344 1345 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1346 bridge_timer, sc); 1347 bstp_initialization(sc); 1348 1349 ifp->if_flags |= IFF_RUNNING; 1350 return 0; 1351 } 1352 1353 /* 1354 * bridge_stop: 1355 * 1356 * Stop the bridge interface. 1357 */ 1358 static void 1359 bridge_stop(struct ifnet *ifp, int disable) 1360 { 1361 struct bridge_softc *sc = ifp->if_softc; 1362 1363 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1364 ifp->if_flags &= ~IFF_RUNNING; 1365 1366 callout_halt(&sc->sc_brcallout, NULL); 1367 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1368 bstp_stop(sc); 1369 bridge_rtflush(sc, IFBF_FLUSHDYN); 1370 } 1371 1372 /* 1373 * bridge_enqueue: 1374 * 1375 * Enqueue a packet on a bridge member interface. 1376 */ 1377 void 1378 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1379 int runfilt) 1380 { 1381 int len, error; 1382 short mflags; 1383 1384 /* 1385 * Clear any in-bound checksum flags for this packet. 1386 */ 1387 m->m_pkthdr.csum_flags = 0; 1388 1389 if (runfilt) { 1390 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1391 dst_ifp, PFIL_OUT) != 0) { 1392 if (m != NULL) 1393 m_freem(m); 1394 return; 1395 } 1396 if (m == NULL) 1397 return; 1398 } 1399 1400 #ifdef ALTQ 1401 KERNEL_LOCK(1, NULL); 1402 /* 1403 * If ALTQ is enabled on the member interface, do 1404 * classification; the queueing discipline might 1405 * not require classification, but might require 1406 * the address family/header pointer in the pktattr. 1407 */ 1408 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1409 /* XXX IFT_ETHER */ 1410 altq_etherclassify(&dst_ifp->if_snd, m); 1411 } 1412 KERNEL_UNLOCK_ONE(NULL); 1413 #endif /* ALTQ */ 1414 1415 len = m->m_pkthdr.len; 1416 mflags = m->m_flags; 1417 1418 error = if_transmit_lock(dst_ifp, m); 1419 if (error) { 1420 /* mbuf is already freed */ 1421 sc->sc_if.if_oerrors++; 1422 return; 1423 } 1424 1425 sc->sc_if.if_opackets++; 1426 sc->sc_if.if_obytes += len; 1427 if (mflags & M_MCAST) 1428 sc->sc_if.if_omcasts++; 1429 } 1430 1431 /* 1432 * bridge_output: 1433 * 1434 * Send output from a bridge member interface. This 1435 * performs the bridging function for locally originated 1436 * packets. 1437 * 1438 * The mbuf has the Ethernet header already attached. We must 1439 * enqueue or free the mbuf before returning. 1440 */ 1441 int 1442 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1443 const struct rtentry *rt) 1444 { 1445 struct ether_header *eh; 1446 struct ifnet *dst_if; 1447 struct bridge_softc *sc; 1448 int s; 1449 1450 /* 1451 * bridge_output() is called from ether_output(), furthermore 1452 * ifp argument doesn't point to bridge(4). So, don't assert 1453 * IFEF_MPSAFE here. 1454 */ 1455 1456 if (m->m_len < ETHER_HDR_LEN) { 1457 m = m_pullup(m, ETHER_HDR_LEN); 1458 if (m == NULL) 1459 return 0; 1460 } 1461 1462 eh = mtod(m, struct ether_header *); 1463 sc = ifp->if_bridge; 1464 1465 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1466 if (memcmp(etherbroadcastaddr, 1467 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1468 m->m_flags |= M_BCAST; 1469 else 1470 m->m_flags |= M_MCAST; 1471 } 1472 1473 /* 1474 * If bridge is down, but the original output interface is up, 1475 * go ahead and send out that interface. Otherwise, the packet 1476 * is dropped below. 1477 */ 1478 if (__predict_false(sc == NULL) || 1479 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1480 dst_if = ifp; 1481 goto sendunicast; 1482 } 1483 1484 /* 1485 * If the packet is a multicast, or we don't know a better way to 1486 * get there, send to all interfaces. 1487 */ 1488 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1489 dst_if = NULL; 1490 else 1491 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1492 if (dst_if == NULL) { 1493 /* XXX Should call bridge_broadcast, but there are locking 1494 * issues which need resolving first. */ 1495 struct bridge_iflist *bif; 1496 struct mbuf *mc; 1497 bool used = false; 1498 1499 BRIDGE_PSZ_RENTER(s); 1500 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1501 struct psref psref; 1502 1503 bridge_acquire_member(sc, bif, &psref); 1504 BRIDGE_PSZ_REXIT(s); 1505 1506 dst_if = bif->bif_ifp; 1507 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1508 goto next; 1509 1510 /* 1511 * If this is not the original output interface, 1512 * and the interface is participating in spanning 1513 * tree, make sure the port is in a state that 1514 * allows forwarding. 1515 */ 1516 if (dst_if != ifp && 1517 (bif->bif_flags & IFBIF_STP) != 0) { 1518 switch (bif->bif_state) { 1519 case BSTP_IFSTATE_BLOCKING: 1520 case BSTP_IFSTATE_LISTENING: 1521 case BSTP_IFSTATE_DISABLED: 1522 goto next; 1523 } 1524 } 1525 1526 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1527 bif_next) == NULL && 1528 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1529 dst_if == ifp)) 1530 { 1531 used = true; 1532 mc = m; 1533 } else { 1534 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1535 if (mc == NULL) { 1536 sc->sc_if.if_oerrors++; 1537 goto next; 1538 } 1539 } 1540 1541 bridge_enqueue(sc, dst_if, mc, 0); 1542 1543 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1544 dst_if != ifp) 1545 { 1546 if (PSLIST_READER_NEXT(bif, 1547 struct bridge_iflist, bif_next) == NULL) 1548 { 1549 used = true; 1550 mc = m; 1551 } else { 1552 mc = m_copym(m, 0, M_COPYALL, 1553 M_DONTWAIT); 1554 if (mc == NULL) { 1555 sc->sc_if.if_oerrors++; 1556 goto next; 1557 } 1558 } 1559 1560 m_set_rcvif(mc, dst_if); 1561 mc->m_flags &= ~M_PROMISC; 1562 1563 #ifndef NET_MPSAFE 1564 s = splsoftnet(); 1565 #endif 1566 ether_input(dst_if, mc); 1567 #ifndef NET_MPSAFE 1568 splx(s); 1569 #endif 1570 } 1571 1572 next: 1573 BRIDGE_PSZ_RENTER(s); 1574 bridge_release_member(sc, bif, &psref); 1575 1576 /* Guarantee we don't re-enter the loop as we already 1577 * decided we're at the end. */ 1578 if (used) 1579 break; 1580 } 1581 BRIDGE_PSZ_REXIT(s); 1582 1583 if (!used) 1584 m_freem(m); 1585 return 0; 1586 } 1587 1588 sendunicast: 1589 /* 1590 * XXX Spanning tree consideration here? 1591 */ 1592 1593 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1594 m_freem(m); 1595 return 0; 1596 } 1597 1598 bridge_enqueue(sc, dst_if, m, 0); 1599 1600 return 0; 1601 } 1602 1603 /* 1604 * bridge_start: 1605 * 1606 * Start output on a bridge. 1607 * 1608 * NOTE: This routine should never be called in this implementation. 1609 */ 1610 static void 1611 bridge_start(struct ifnet *ifp) 1612 { 1613 1614 printf("%s: bridge_start() called\n", ifp->if_xname); 1615 } 1616 1617 /* 1618 * bridge_forward: 1619 * 1620 * The forwarding function of the bridge. 1621 */ 1622 static void 1623 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1624 { 1625 struct bridge_iflist *bif; 1626 struct ifnet *src_if, *dst_if; 1627 struct ether_header *eh; 1628 struct psref psref; 1629 struct psref psref_src; 1630 DECLARE_LOCK_VARIABLE; 1631 1632 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1633 return; 1634 1635 src_if = m_get_rcvif_psref(m, &psref_src); 1636 if (src_if == NULL) { 1637 /* Interface is being destroyed? */ 1638 m_freem(m); 1639 goto out; 1640 } 1641 1642 sc->sc_if.if_ipackets++; 1643 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1644 1645 /* 1646 * Look up the bridge_iflist. 1647 */ 1648 bif = bridge_lookup_member_if(sc, src_if, &psref); 1649 if (bif == NULL) { 1650 /* Interface is not a bridge member (anymore?) */ 1651 m_freem(m); 1652 goto out; 1653 } 1654 1655 if (bif->bif_flags & IFBIF_STP) { 1656 switch (bif->bif_state) { 1657 case BSTP_IFSTATE_BLOCKING: 1658 case BSTP_IFSTATE_LISTENING: 1659 case BSTP_IFSTATE_DISABLED: 1660 m_freem(m); 1661 bridge_release_member(sc, bif, &psref); 1662 goto out; 1663 } 1664 } 1665 1666 eh = mtod(m, struct ether_header *); 1667 1668 /* 1669 * If the interface is learning, and the source 1670 * address is valid and not multicast, record 1671 * the address. 1672 */ 1673 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1674 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1675 (eh->ether_shost[0] == 0 && 1676 eh->ether_shost[1] == 0 && 1677 eh->ether_shost[2] == 0 && 1678 eh->ether_shost[3] == 0 && 1679 eh->ether_shost[4] == 0 && 1680 eh->ether_shost[5] == 0) == 0) { 1681 (void) bridge_rtupdate(sc, eh->ether_shost, 1682 src_if, 0, IFBAF_DYNAMIC); 1683 } 1684 1685 if ((bif->bif_flags & IFBIF_STP) != 0 && 1686 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1687 m_freem(m); 1688 bridge_release_member(sc, bif, &psref); 1689 goto out; 1690 } 1691 1692 bridge_release_member(sc, bif, &psref); 1693 1694 /* 1695 * At this point, the port either doesn't participate 1696 * in spanning tree or it is in the forwarding state. 1697 */ 1698 1699 /* 1700 * If the packet is unicast, destined for someone on 1701 * "this" side of the bridge, drop it. 1702 */ 1703 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1704 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1705 if (src_if == dst_if) { 1706 m_freem(m); 1707 goto out; 1708 } 1709 } else { 1710 /* ...forward it to all interfaces. */ 1711 sc->sc_if.if_imcasts++; 1712 dst_if = NULL; 1713 } 1714 1715 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1716 if (m != NULL) 1717 m_freem(m); 1718 goto out; 1719 } 1720 if (m == NULL) 1721 goto out; 1722 1723 if (dst_if == NULL) { 1724 bridge_broadcast(sc, src_if, m); 1725 goto out; 1726 } 1727 1728 m_put_rcvif_psref(src_if, &psref_src); 1729 src_if = NULL; 1730 1731 /* 1732 * At this point, we're dealing with a unicast frame 1733 * going to a different interface. 1734 */ 1735 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1736 m_freem(m); 1737 goto out; 1738 } 1739 1740 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1741 if (bif == NULL) { 1742 /* Not a member of the bridge (anymore?) */ 1743 m_freem(m); 1744 goto out; 1745 } 1746 1747 if (bif->bif_flags & IFBIF_STP) { 1748 switch (bif->bif_state) { 1749 case BSTP_IFSTATE_DISABLED: 1750 case BSTP_IFSTATE_BLOCKING: 1751 m_freem(m); 1752 bridge_release_member(sc, bif, &psref); 1753 goto out; 1754 } 1755 } 1756 1757 bridge_release_member(sc, bif, &psref); 1758 1759 ACQUIRE_GLOBAL_LOCKS(); 1760 bridge_enqueue(sc, dst_if, m, 1); 1761 RELEASE_GLOBAL_LOCKS(); 1762 out: 1763 if (src_if != NULL) 1764 m_put_rcvif_psref(src_if, &psref_src); 1765 return; 1766 } 1767 1768 static bool 1769 bstp_state_before_learning(struct bridge_iflist *bif) 1770 { 1771 if (bif->bif_flags & IFBIF_STP) { 1772 switch (bif->bif_state) { 1773 case BSTP_IFSTATE_BLOCKING: 1774 case BSTP_IFSTATE_LISTENING: 1775 case BSTP_IFSTATE_DISABLED: 1776 return true; 1777 } 1778 } 1779 return false; 1780 } 1781 1782 static bool 1783 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1784 { 1785 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1786 1787 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1788 #if NCARP > 0 1789 || (bif->bif_ifp->if_carp && 1790 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1791 #endif /* NCARP > 0 */ 1792 ) 1793 return true; 1794 1795 return false; 1796 } 1797 1798 /* 1799 * bridge_input: 1800 * 1801 * Receive input from a member interface. Queue the packet for 1802 * bridging if it is not for us. 1803 */ 1804 static void 1805 bridge_input(struct ifnet *ifp, struct mbuf *m) 1806 { 1807 struct bridge_softc *sc = ifp->if_bridge; 1808 struct bridge_iflist *bif; 1809 struct ether_header *eh; 1810 struct psref psref; 1811 int bound; 1812 DECLARE_LOCK_VARIABLE; 1813 1814 KASSERT(!cpu_intr_p()); 1815 1816 if (__predict_false(sc == NULL) || 1817 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1818 ACQUIRE_GLOBAL_LOCKS(); 1819 ether_input(ifp, m); 1820 RELEASE_GLOBAL_LOCKS(); 1821 return; 1822 } 1823 1824 bound = curlwp_bind(); 1825 bif = bridge_lookup_member_if(sc, ifp, &psref); 1826 if (bif == NULL) { 1827 curlwp_bindx(bound); 1828 ACQUIRE_GLOBAL_LOCKS(); 1829 ether_input(ifp, m); 1830 RELEASE_GLOBAL_LOCKS(); 1831 return; 1832 } 1833 1834 eh = mtod(m, struct ether_header *); 1835 1836 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1837 if (memcmp(etherbroadcastaddr, 1838 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1839 m->m_flags |= M_BCAST; 1840 else 1841 m->m_flags |= M_MCAST; 1842 } 1843 1844 /* 1845 * A 'fast' path for packets addressed to interfaces that are 1846 * part of this bridge. 1847 */ 1848 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1849 !bstp_state_before_learning(bif)) { 1850 struct bridge_iflist *_bif; 1851 struct ifnet *_ifp = NULL; 1852 int s; 1853 struct psref _psref; 1854 1855 BRIDGE_PSZ_RENTER(s); 1856 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1857 /* It is destined for us. */ 1858 if (bridge_ourether(_bif, eh, 0)) { 1859 bridge_acquire_member(sc, _bif, &_psref); 1860 BRIDGE_PSZ_REXIT(s); 1861 if (_bif->bif_flags & IFBIF_LEARNING) 1862 (void) bridge_rtupdate(sc, 1863 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1864 m_set_rcvif(m, _bif->bif_ifp); 1865 _ifp = _bif->bif_ifp; 1866 bridge_release_member(sc, _bif, &_psref); 1867 goto out; 1868 } 1869 1870 /* We just received a packet that we sent out. */ 1871 if (bridge_ourether(_bif, eh, 1)) 1872 break; 1873 } 1874 BRIDGE_PSZ_REXIT(s); 1875 out: 1876 1877 if (_bif != NULL) { 1878 bridge_release_member(sc, bif, &psref); 1879 curlwp_bindx(bound); 1880 if (_ifp != NULL) { 1881 m->m_flags &= ~M_PROMISC; 1882 ACQUIRE_GLOBAL_LOCKS(); 1883 ether_input(_ifp, m); 1884 RELEASE_GLOBAL_LOCKS(); 1885 } else 1886 m_freem(m); 1887 return; 1888 } 1889 } 1890 1891 /* Tap off 802.1D packets; they do not get forwarded. */ 1892 if (bif->bif_flags & IFBIF_STP && 1893 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1894 bstp_input(sc, bif, m); 1895 bridge_release_member(sc, bif, &psref); 1896 curlwp_bindx(bound); 1897 return; 1898 } 1899 1900 /* 1901 * A normal switch would discard the packet here, but that's not what 1902 * we've done historically. This also prevents some obnoxious behaviour. 1903 */ 1904 if (bstp_state_before_learning(bif)) { 1905 bridge_release_member(sc, bif, &psref); 1906 curlwp_bindx(bound); 1907 ACQUIRE_GLOBAL_LOCKS(); 1908 ether_input(ifp, m); 1909 RELEASE_GLOBAL_LOCKS(); 1910 return; 1911 } 1912 1913 bridge_release_member(sc, bif, &psref); 1914 1915 bridge_forward(sc, m); 1916 1917 curlwp_bindx(bound); 1918 } 1919 1920 /* 1921 * bridge_broadcast: 1922 * 1923 * Send a frame to all interfaces that are members of 1924 * the bridge, except for the one on which the packet 1925 * arrived. 1926 */ 1927 static void 1928 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1929 struct mbuf *m) 1930 { 1931 struct bridge_iflist *bif; 1932 struct mbuf *mc; 1933 struct ifnet *dst_if; 1934 bool bmcast; 1935 int s; 1936 DECLARE_LOCK_VARIABLE; 1937 1938 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1939 1940 BRIDGE_PSZ_RENTER(s); 1941 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1942 struct psref psref; 1943 1944 bridge_acquire_member(sc, bif, &psref); 1945 BRIDGE_PSZ_REXIT(s); 1946 1947 dst_if = bif->bif_ifp; 1948 1949 if (bif->bif_flags & IFBIF_STP) { 1950 switch (bif->bif_state) { 1951 case BSTP_IFSTATE_BLOCKING: 1952 case BSTP_IFSTATE_DISABLED: 1953 goto next; 1954 } 1955 } 1956 1957 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1958 goto next; 1959 1960 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1961 goto next; 1962 1963 if (dst_if != src_if) { 1964 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1965 if (mc == NULL) { 1966 sc->sc_if.if_oerrors++; 1967 goto next; 1968 } 1969 ACQUIRE_GLOBAL_LOCKS(); 1970 bridge_enqueue(sc, dst_if, mc, 1); 1971 RELEASE_GLOBAL_LOCKS(); 1972 } 1973 1974 if (bmcast) { 1975 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1976 if (mc == NULL) { 1977 sc->sc_if.if_oerrors++; 1978 goto next; 1979 } 1980 1981 m_set_rcvif(mc, dst_if); 1982 mc->m_flags &= ~M_PROMISC; 1983 1984 ACQUIRE_GLOBAL_LOCKS(); 1985 ether_input(dst_if, mc); 1986 RELEASE_GLOBAL_LOCKS(); 1987 } 1988 next: 1989 BRIDGE_PSZ_RENTER(s); 1990 bridge_release_member(sc, bif, &psref); 1991 } 1992 BRIDGE_PSZ_REXIT(s); 1993 1994 m_freem(m); 1995 } 1996 1997 static int 1998 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1999 struct bridge_rtnode **brtp) 2000 { 2001 struct bridge_rtnode *brt; 2002 int error; 2003 2004 if (sc->sc_brtcnt >= sc->sc_brtmax) 2005 return ENOSPC; 2006 2007 /* 2008 * Allocate a new bridge forwarding node, and 2009 * initialize the expiration time and Ethernet 2010 * address. 2011 */ 2012 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2013 if (brt == NULL) 2014 return ENOMEM; 2015 2016 memset(brt, 0, sizeof(*brt)); 2017 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2018 brt->brt_flags = IFBAF_DYNAMIC; 2019 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2020 2021 BRIDGE_RT_LOCK(sc); 2022 error = bridge_rtnode_insert(sc, brt); 2023 BRIDGE_RT_UNLOCK(sc); 2024 2025 if (error != 0) { 2026 pool_put(&bridge_rtnode_pool, brt); 2027 return error; 2028 } 2029 2030 *brtp = brt; 2031 return 0; 2032 } 2033 2034 /* 2035 * bridge_rtupdate: 2036 * 2037 * Add a bridge routing entry. 2038 */ 2039 static int 2040 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2041 struct ifnet *dst_if, int setflags, uint8_t flags) 2042 { 2043 struct bridge_rtnode *brt; 2044 int s; 2045 2046 again: 2047 /* 2048 * A route for this destination might already exist. If so, 2049 * update it, otherwise create a new one. 2050 */ 2051 BRIDGE_RT_RENTER(s); 2052 brt = bridge_rtnode_lookup(sc, dst); 2053 2054 if (brt != NULL) { 2055 brt->brt_ifp = dst_if; 2056 if (setflags) { 2057 brt->brt_flags = flags; 2058 if (flags & IFBAF_STATIC) 2059 brt->brt_expire = 0; 2060 else 2061 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2062 } else { 2063 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2064 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2065 } 2066 } 2067 BRIDGE_RT_REXIT(s); 2068 2069 if (brt == NULL) { 2070 int r; 2071 2072 r = bridge_rtalloc(sc, dst, &brt); 2073 if (r != 0) 2074 return r; 2075 goto again; 2076 } 2077 2078 return 0; 2079 } 2080 2081 /* 2082 * bridge_rtlookup: 2083 * 2084 * Lookup the destination interface for an address. 2085 */ 2086 static struct ifnet * 2087 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2088 { 2089 struct bridge_rtnode *brt; 2090 struct ifnet *ifs = NULL; 2091 int s; 2092 2093 BRIDGE_RT_RENTER(s); 2094 brt = bridge_rtnode_lookup(sc, addr); 2095 if (brt != NULL) 2096 ifs = brt->brt_ifp; 2097 BRIDGE_RT_REXIT(s); 2098 2099 return ifs; 2100 } 2101 2102 typedef bool (*bridge_iterate_cb_t) 2103 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2104 2105 /* 2106 * bridge_rtlist_iterate_remove: 2107 * 2108 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2109 * callback judges to remove. Removals of rtnodes are done in a manner 2110 * of pserialize. To this end, all kmem_* operations are placed out of 2111 * mutexes. 2112 */ 2113 static void 2114 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2115 { 2116 struct bridge_rtnode *brt, *nbrt; 2117 struct bridge_rtnode **brt_list; 2118 int i, count; 2119 2120 retry: 2121 count = sc->sc_brtcnt; 2122 if (count == 0) 2123 return; 2124 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2125 2126 BRIDGE_RT_LOCK(sc); 2127 if (__predict_false(sc->sc_brtcnt > count)) { 2128 /* The rtnodes increased, we need more memory */ 2129 BRIDGE_RT_UNLOCK(sc); 2130 kmem_free(brt_list, sizeof(*brt_list) * count); 2131 goto retry; 2132 } 2133 2134 i = 0; 2135 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2136 bool need_break = false; 2137 if (func(sc, brt, &need_break, arg)) { 2138 bridge_rtnode_remove(sc, brt); 2139 brt_list[i++] = brt; 2140 } 2141 if (need_break) 2142 break; 2143 } 2144 2145 if (i > 0) 2146 BRIDGE_RT_PSZ_PERFORM(sc); 2147 BRIDGE_RT_UNLOCK(sc); 2148 2149 while (--i >= 0) 2150 bridge_rtnode_destroy(brt_list[i]); 2151 2152 kmem_free(brt_list, sizeof(*brt_list) * count); 2153 } 2154 2155 static bool 2156 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2157 bool *need_break, void *arg) 2158 { 2159 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2160 /* Take into account of the subsequent removal */ 2161 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2162 *need_break = true; 2163 return true; 2164 } else 2165 return false; 2166 } 2167 2168 static void 2169 bridge_rttrim0(struct bridge_softc *sc) 2170 { 2171 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2172 } 2173 2174 /* 2175 * bridge_rttrim: 2176 * 2177 * Trim the routine table so that we have a number 2178 * of routing entries less than or equal to the 2179 * maximum number. 2180 */ 2181 static void 2182 bridge_rttrim(struct bridge_softc *sc) 2183 { 2184 2185 /* Make sure we actually need to do this. */ 2186 if (sc->sc_brtcnt <= sc->sc_brtmax) 2187 return; 2188 2189 /* Force an aging cycle; this might trim enough addresses. */ 2190 bridge_rtage(sc); 2191 if (sc->sc_brtcnt <= sc->sc_brtmax) 2192 return; 2193 2194 bridge_rttrim0(sc); 2195 2196 return; 2197 } 2198 2199 /* 2200 * bridge_timer: 2201 * 2202 * Aging timer for the bridge. 2203 */ 2204 static void 2205 bridge_timer(void *arg) 2206 { 2207 struct bridge_softc *sc = arg; 2208 2209 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2210 } 2211 2212 static void 2213 bridge_rtage_work(struct work *wk, void *arg) 2214 { 2215 struct bridge_softc *sc = arg; 2216 2217 KASSERT(wk == &sc->sc_rtage_wk); 2218 2219 bridge_rtage(sc); 2220 2221 if (sc->sc_if.if_flags & IFF_RUNNING) 2222 callout_reset(&sc->sc_brcallout, 2223 bridge_rtable_prune_period * hz, bridge_timer, sc); 2224 } 2225 2226 static bool 2227 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2228 bool *need_break, void *arg) 2229 { 2230 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2231 time_uptime >= brt->brt_expire) 2232 return true; 2233 else 2234 return false; 2235 } 2236 2237 /* 2238 * bridge_rtage: 2239 * 2240 * Perform an aging cycle. 2241 */ 2242 static void 2243 bridge_rtage(struct bridge_softc *sc) 2244 { 2245 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2246 } 2247 2248 2249 static bool 2250 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2251 bool *need_break, void *arg) 2252 { 2253 int full = *(int*)arg; 2254 2255 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2256 return true; 2257 else 2258 return false; 2259 } 2260 2261 /* 2262 * bridge_rtflush: 2263 * 2264 * Remove all dynamic addresses from the bridge. 2265 */ 2266 static void 2267 bridge_rtflush(struct bridge_softc *sc, int full) 2268 { 2269 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2270 } 2271 2272 /* 2273 * bridge_rtdaddr: 2274 * 2275 * Remove an address from the table. 2276 */ 2277 static int 2278 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2279 { 2280 struct bridge_rtnode *brt; 2281 2282 BRIDGE_RT_LOCK(sc); 2283 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2284 BRIDGE_RT_UNLOCK(sc); 2285 return ENOENT; 2286 } 2287 bridge_rtnode_remove(sc, brt); 2288 BRIDGE_RT_PSZ_PERFORM(sc); 2289 BRIDGE_RT_UNLOCK(sc); 2290 2291 bridge_rtnode_destroy(brt); 2292 2293 return 0; 2294 } 2295 2296 /* 2297 * bridge_rtdelete: 2298 * 2299 * Delete routes to a speicifc member interface. 2300 */ 2301 static void 2302 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2303 { 2304 struct bridge_rtnode *brt; 2305 2306 BRIDGE_RT_LOCK(sc); 2307 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2308 if (brt->brt_ifp == ifp) 2309 break; 2310 } 2311 if (brt == NULL) { 2312 BRIDGE_RT_UNLOCK(sc); 2313 return; 2314 } 2315 bridge_rtnode_remove(sc, brt); 2316 BRIDGE_RT_PSZ_PERFORM(sc); 2317 BRIDGE_RT_UNLOCK(sc); 2318 2319 bridge_rtnode_destroy(brt); 2320 } 2321 2322 /* 2323 * bridge_rtable_init: 2324 * 2325 * Initialize the route table for this bridge. 2326 */ 2327 static void 2328 bridge_rtable_init(struct bridge_softc *sc) 2329 { 2330 int i; 2331 2332 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2333 KM_SLEEP); 2334 2335 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2336 LIST_INIT(&sc->sc_rthash[i]); 2337 2338 sc->sc_rthash_key = cprng_fast32(); 2339 2340 LIST_INIT(&sc->sc_rtlist); 2341 2342 sc->sc_rtlist_psz = pserialize_create(); 2343 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2344 } 2345 2346 /* 2347 * bridge_rtable_fini: 2348 * 2349 * Deconstruct the route table for this bridge. 2350 */ 2351 static void 2352 bridge_rtable_fini(struct bridge_softc *sc) 2353 { 2354 2355 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2356 if (sc->sc_rtlist_lock) 2357 mutex_obj_free(sc->sc_rtlist_lock); 2358 if (sc->sc_rtlist_psz) 2359 pserialize_destroy(sc->sc_rtlist_psz); 2360 } 2361 2362 /* 2363 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2364 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2365 */ 2366 #define mix(a, b, c) \ 2367 do { \ 2368 a -= b; a -= c; a ^= (c >> 13); \ 2369 b -= c; b -= a; b ^= (a << 8); \ 2370 c -= a; c -= b; c ^= (b >> 13); \ 2371 a -= b; a -= c; a ^= (c >> 12); \ 2372 b -= c; b -= a; b ^= (a << 16); \ 2373 c -= a; c -= b; c ^= (b >> 5); \ 2374 a -= b; a -= c; a ^= (c >> 3); \ 2375 b -= c; b -= a; b ^= (a << 10); \ 2376 c -= a; c -= b; c ^= (b >> 15); \ 2377 } while (/*CONSTCOND*/0) 2378 2379 static inline uint32_t 2380 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2381 { 2382 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2383 2384 b += addr[5] << 8; 2385 b += addr[4]; 2386 a += addr[3] << 24; 2387 a += addr[2] << 16; 2388 a += addr[1] << 8; 2389 a += addr[0]; 2390 2391 mix(a, b, c); 2392 2393 return (c & BRIDGE_RTHASH_MASK); 2394 } 2395 2396 #undef mix 2397 2398 /* 2399 * bridge_rtnode_lookup: 2400 * 2401 * Look up a bridge route node for the specified destination. 2402 */ 2403 static struct bridge_rtnode * 2404 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2405 { 2406 struct bridge_rtnode *brt; 2407 uint32_t hash; 2408 int dir; 2409 2410 hash = bridge_rthash(sc, addr); 2411 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2412 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2413 if (dir == 0) 2414 return brt; 2415 if (dir > 0) 2416 return NULL; 2417 } 2418 2419 return NULL; 2420 } 2421 2422 /* 2423 * bridge_rtnode_insert: 2424 * 2425 * Insert the specified bridge node into the route table. We 2426 * assume the entry is not already in the table. 2427 */ 2428 static int 2429 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2430 { 2431 struct bridge_rtnode *lbrt; 2432 uint32_t hash; 2433 int dir; 2434 2435 KASSERT(BRIDGE_RT_LOCKED(sc)); 2436 2437 hash = bridge_rthash(sc, brt->brt_addr); 2438 2439 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2440 if (lbrt == NULL) { 2441 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2442 goto out; 2443 } 2444 2445 do { 2446 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2447 if (dir == 0) 2448 return EEXIST; 2449 if (dir > 0) { 2450 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2451 goto out; 2452 } 2453 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2454 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2455 goto out; 2456 } 2457 lbrt = LIST_NEXT(lbrt, brt_hash); 2458 } while (lbrt != NULL); 2459 2460 #ifdef DIAGNOSTIC 2461 panic("bridge_rtnode_insert: impossible"); 2462 #endif 2463 2464 out: 2465 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2466 sc->sc_brtcnt++; 2467 2468 return 0; 2469 } 2470 2471 /* 2472 * bridge_rtnode_remove: 2473 * 2474 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2475 */ 2476 static void 2477 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2478 { 2479 2480 KASSERT(BRIDGE_RT_LOCKED(sc)); 2481 2482 LIST_REMOVE(brt, brt_hash); 2483 LIST_REMOVE(brt, brt_list); 2484 sc->sc_brtcnt--; 2485 } 2486 2487 /* 2488 * bridge_rtnode_destroy: 2489 * 2490 * Destroy a bridge rtnode. 2491 */ 2492 static void 2493 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2494 { 2495 2496 pool_put(&bridge_rtnode_pool, brt); 2497 } 2498 2499 #if defined(BRIDGE_IPF) 2500 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2501 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2502 2503 /* 2504 * Send bridge packets through IPF if they are one of the types IPF can deal 2505 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2506 * question.) 2507 */ 2508 static int 2509 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2510 { 2511 int snap, error; 2512 struct ether_header *eh1, eh2; 2513 struct llc llc1; 2514 uint16_t ether_type; 2515 2516 snap = 0; 2517 error = -1; /* Default error if not error == 0 */ 2518 eh1 = mtod(*mp, struct ether_header *); 2519 ether_type = ntohs(eh1->ether_type); 2520 2521 /* 2522 * Check for SNAP/LLC. 2523 */ 2524 if (ether_type < ETHERMTU) { 2525 struct llc *llc2 = (struct llc *)(eh1 + 1); 2526 2527 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2528 llc2->llc_dsap == LLC_SNAP_LSAP && 2529 llc2->llc_ssap == LLC_SNAP_LSAP && 2530 llc2->llc_control == LLC_UI) { 2531 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2532 snap = 1; 2533 } 2534 } 2535 2536 /* 2537 * If we're trying to filter bridge traffic, don't look at anything 2538 * other than IP and ARP traffic. If the filter doesn't understand 2539 * IPv6, don't allow IPv6 through the bridge either. This is lame 2540 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2541 * but of course we don't have an AppleTalk filter to begin with. 2542 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2543 * ARP traffic.) 2544 */ 2545 switch (ether_type) { 2546 case ETHERTYPE_ARP: 2547 case ETHERTYPE_REVARP: 2548 return 0; /* Automatically pass */ 2549 case ETHERTYPE_IP: 2550 # ifdef INET6 2551 case ETHERTYPE_IPV6: 2552 # endif /* INET6 */ 2553 break; 2554 default: 2555 goto bad; 2556 } 2557 2558 /* Strip off the Ethernet header and keep a copy. */ 2559 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2560 m_adj(*mp, ETHER_HDR_LEN); 2561 2562 /* Strip off snap header, if present */ 2563 if (snap) { 2564 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2565 m_adj(*mp, sizeof(struct llc)); 2566 } 2567 2568 /* 2569 * Check basic packet sanity and run IPF through pfil. 2570 */ 2571 KASSERT(!cpu_intr_p()); 2572 switch (ether_type) 2573 { 2574 case ETHERTYPE_IP : 2575 error = bridge_ip_checkbasic(mp); 2576 if (error == 0) 2577 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2578 break; 2579 # ifdef INET6 2580 case ETHERTYPE_IPV6 : 2581 error = bridge_ip6_checkbasic(mp); 2582 if (error == 0) 2583 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2584 break; 2585 # endif 2586 default : 2587 error = 0; 2588 break; 2589 } 2590 2591 if (*mp == NULL) 2592 return error; 2593 if (error != 0) 2594 goto bad; 2595 2596 error = -1; 2597 2598 /* 2599 * Finally, put everything back the way it was and return 2600 */ 2601 if (snap) { 2602 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2603 if (*mp == NULL) 2604 return error; 2605 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2606 } 2607 2608 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2609 if (*mp == NULL) 2610 return error; 2611 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2612 2613 return 0; 2614 2615 bad: 2616 m_freem(*mp); 2617 *mp = NULL; 2618 return error; 2619 } 2620 2621 /* 2622 * Perform basic checks on header size since 2623 * IPF assumes ip_input has already processed 2624 * it for it. Cut-and-pasted from ip_input.c. 2625 * Given how simple the IPv6 version is, 2626 * does the IPv4 version really need to be 2627 * this complicated? 2628 * 2629 * XXX Should we update ipstat here, or not? 2630 * XXX Right now we update ipstat but not 2631 * XXX csum_counter. 2632 */ 2633 static int 2634 bridge_ip_checkbasic(struct mbuf **mp) 2635 { 2636 struct mbuf *m = *mp; 2637 struct ip *ip; 2638 int len, hlen; 2639 2640 if (*mp == NULL) 2641 return -1; 2642 2643 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2644 if ((m = m_copyup(m, sizeof(struct ip), 2645 (max_linkhdr + 3) & ~3)) == NULL) { 2646 /* XXXJRT new stat, please */ 2647 ip_statinc(IP_STAT_TOOSMALL); 2648 goto bad; 2649 } 2650 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2651 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2652 ip_statinc(IP_STAT_TOOSMALL); 2653 goto bad; 2654 } 2655 } 2656 ip = mtod(m, struct ip *); 2657 if (ip == NULL) goto bad; 2658 2659 if (ip->ip_v != IPVERSION) { 2660 ip_statinc(IP_STAT_BADVERS); 2661 goto bad; 2662 } 2663 hlen = ip->ip_hl << 2; 2664 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2665 ip_statinc(IP_STAT_BADHLEN); 2666 goto bad; 2667 } 2668 if (hlen > m->m_len) { 2669 if ((m = m_pullup(m, hlen)) == 0) { 2670 ip_statinc(IP_STAT_BADHLEN); 2671 goto bad; 2672 } 2673 ip = mtod(m, struct ip *); 2674 if (ip == NULL) goto bad; 2675 } 2676 2677 switch (m->m_pkthdr.csum_flags & 2678 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2679 M_CSUM_IPv4_BAD)) { 2680 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2681 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2682 goto bad; 2683 2684 case M_CSUM_IPv4: 2685 /* Checksum was okay. */ 2686 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2687 break; 2688 2689 default: 2690 /* Must compute it ourselves. */ 2691 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2692 if (in_cksum(m, hlen) != 0) 2693 goto bad; 2694 break; 2695 } 2696 2697 /* Retrieve the packet length. */ 2698 len = ntohs(ip->ip_len); 2699 2700 /* 2701 * Check for additional length bogosity 2702 */ 2703 if (len < hlen) { 2704 ip_statinc(IP_STAT_BADLEN); 2705 goto bad; 2706 } 2707 2708 /* 2709 * Check that the amount of data in the buffers 2710 * is as at least much as the IP header would have us expect. 2711 * Drop packet if shorter than we expect. 2712 */ 2713 if (m->m_pkthdr.len < len) { 2714 ip_statinc(IP_STAT_TOOSHORT); 2715 goto bad; 2716 } 2717 2718 /* Checks out, proceed */ 2719 *mp = m; 2720 return 0; 2721 2722 bad: 2723 *mp = m; 2724 return -1; 2725 } 2726 2727 # ifdef INET6 2728 /* 2729 * Same as above, but for IPv6. 2730 * Cut-and-pasted from ip6_input.c. 2731 * XXX Should we update ip6stat, or not? 2732 */ 2733 static int 2734 bridge_ip6_checkbasic(struct mbuf **mp) 2735 { 2736 struct mbuf *m = *mp; 2737 struct ip6_hdr *ip6; 2738 2739 /* 2740 * If the IPv6 header is not aligned, slurp it up into a new 2741 * mbuf with space for link headers, in the event we forward 2742 * it. Otherwise, if it is aligned, make sure the entire base 2743 * IPv6 header is in the first mbuf of the chain. 2744 */ 2745 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2746 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2747 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2748 (max_linkhdr + 3) & ~3)) == NULL) { 2749 /* XXXJRT new stat, please */ 2750 ip6_statinc(IP6_STAT_TOOSMALL); 2751 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2752 goto bad; 2753 } 2754 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2755 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2756 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2757 ip6_statinc(IP6_STAT_TOOSMALL); 2758 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2759 goto bad; 2760 } 2761 } 2762 2763 ip6 = mtod(m, struct ip6_hdr *); 2764 2765 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2766 ip6_statinc(IP6_STAT_BADVERS); 2767 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2768 goto bad; 2769 } 2770 2771 /* Checks out, proceed */ 2772 *mp = m; 2773 return 0; 2774 2775 bad: 2776 *mp = m; 2777 return -1; 2778 } 2779 # endif /* INET6 */ 2780 #endif /* BRIDGE_IPF */ 2781
Indexes created Thu Oct 02 14:10:14 GMT 2025