if_bridge.c revision 1.73
1 /* $NetBSD: if_bridge.c,v 1.73 2011/05/23 21:52:54 joerg 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 1.73 2011/05/23 21:52:54 joerg Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_pfil_hooks.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> 103 104 #include <net/bpf.h> 105 #include <net/if.h> 106 #include <net/if_dl.h> 107 #include <net/if_types.h> 108 #include <net/if_llc.h> 109 110 #include <net/if_ether.h> 111 #include <net/if_bridgevar.h> 112 113 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 114 /* Used for bridge_ip[6]_checkbasic */ 115 #include <netinet/in.h> 116 #include <netinet/in_systm.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #include <netinet/ip_private.h> /* XXX */ 120 121 #include <netinet/ip6.h> 122 #include <netinet6/in6_var.h> 123 #include <netinet6/ip6_var.h> 124 #include <netinet6/ip6_private.h> /* XXX */ 125 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 126 127 /* 128 * Size of the route hash table. Must be a power of two. 129 */ 130 #ifndef BRIDGE_RTHASH_SIZE 131 #define BRIDGE_RTHASH_SIZE 1024 132 #endif 133 134 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 135 136 #include "carp.h" 137 #if NCARP > 0 138 #include <netinet/in.h> 139 #include <netinet/in_var.h> 140 #include <netinet/ip_carp.h> 141 #endif 142 143 /* 144 * Maximum number of addresses to cache. 145 */ 146 #ifndef BRIDGE_RTABLE_MAX 147 #define BRIDGE_RTABLE_MAX 100 148 #endif 149 150 /* 151 * Spanning tree defaults. 152 */ 153 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 154 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 155 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 156 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 157 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 158 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 159 #define BSTP_DEFAULT_PATH_COST 55 160 161 /* 162 * Timeout (in seconds) for entries learned dynamically. 163 */ 164 #ifndef BRIDGE_RTABLE_TIMEOUT 165 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 166 #endif 167 168 /* 169 * Number of seconds between walks of the route list. 170 */ 171 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 172 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 173 #endif 174 175 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 176 177 static struct pool bridge_rtnode_pool; 178 179 void bridgeattach(int); 180 181 static int bridge_clone_create(struct if_clone *, int); 182 static int bridge_clone_destroy(struct ifnet *); 183 184 static int bridge_ioctl(struct ifnet *, u_long, void *); 185 static int bridge_init(struct ifnet *); 186 static void bridge_stop(struct ifnet *, int); 187 static void bridge_start(struct ifnet *); 188 189 static void bridge_forward(void *); 190 191 static void bridge_timer(void *); 192 193 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 194 struct mbuf *); 195 196 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 197 struct ifnet *, int, uint8_t); 198 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 199 static void bridge_rttrim(struct bridge_softc *); 200 static void bridge_rtage(struct bridge_softc *); 201 static void bridge_rtflush(struct bridge_softc *, int); 202 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 203 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 204 205 static int bridge_rtable_init(struct bridge_softc *); 206 static void bridge_rtable_fini(struct bridge_softc *); 207 208 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 209 const uint8_t *); 210 static int bridge_rtnode_insert(struct bridge_softc *, 211 struct bridge_rtnode *); 212 static void bridge_rtnode_destroy(struct bridge_softc *, 213 struct bridge_rtnode *); 214 215 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 216 const char *name); 217 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 218 struct ifnet *ifp); 219 static void bridge_delete_member(struct bridge_softc *, 220 struct bridge_iflist *); 221 222 static int bridge_ioctl_add(struct bridge_softc *, void *); 223 static int bridge_ioctl_del(struct bridge_softc *, void *); 224 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 225 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 226 static int bridge_ioctl_scache(struct bridge_softc *, void *); 227 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 228 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 229 static int bridge_ioctl_rts(struct bridge_softc *, void *); 230 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 231 static int bridge_ioctl_sto(struct bridge_softc *, void *); 232 static int bridge_ioctl_gto(struct bridge_softc *, void *); 233 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 234 static int bridge_ioctl_flush(struct bridge_softc *, void *); 235 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 236 static int bridge_ioctl_spri(struct bridge_softc *, void *); 237 static int bridge_ioctl_ght(struct bridge_softc *, void *); 238 static int bridge_ioctl_sht(struct bridge_softc *, void *); 239 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 240 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 241 static int bridge_ioctl_gma(struct bridge_softc *, void *); 242 static int bridge_ioctl_sma(struct bridge_softc *, void *); 243 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 244 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 245 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 246 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 247 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 248 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 249 static int bridge_ip_checkbasic(struct mbuf **mp); 250 # ifdef INET6 251 static int bridge_ip6_checkbasic(struct mbuf **mp); 252 # endif /* INET6 */ 253 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 254 255 struct bridge_control { 256 int (*bc_func)(struct bridge_softc *, void *); 257 int bc_argsize; 258 int bc_flags; 259 }; 260 261 #define BC_F_COPYIN 0x01 /* copy arguments in */ 262 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 263 #define BC_F_SUSER 0x04 /* do super-user check */ 264 265 static const struct bridge_control bridge_control_table[] = { 266 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 267 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 268 269 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 270 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 271 272 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 273 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 274 275 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 276 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 277 278 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 279 280 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 281 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 282 283 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 284 285 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 286 287 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 288 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 289 290 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 291 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 292 293 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 294 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 295 296 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 297 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 298 299 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 300 301 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 302 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 303 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 304 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 305 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 306 }; 307 static const int bridge_control_table_size = __arraycount(bridge_control_table); 308 309 static LIST_HEAD(, bridge_softc) bridge_list; 310 311 static struct if_clone bridge_cloner = 312 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 313 314 /* 315 * bridgeattach: 316 * 317 * Pseudo-device attach routine. 318 */ 319 void 320 bridgeattach(int n) 321 { 322 323 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 324 0, 0, 0, "brtpl", NULL, IPL_NET); 325 326 LIST_INIT(&bridge_list); 327 if_clone_attach(&bridge_cloner); 328 } 329 330 /* 331 * bridge_clone_create: 332 * 333 * Create a new bridge instance. 334 */ 335 static int 336 bridge_clone_create(struct if_clone *ifc, int unit) 337 { 338 struct bridge_softc *sc; 339 struct ifnet *ifp; 340 int s; 341 342 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 343 ifp = &sc->sc_if; 344 345 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 346 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 347 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 348 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 349 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 350 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 351 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 352 sc->sc_filter_flags = 0; 353 354 /* software interrupt to do the work */ 355 sc->sc_softintr = softint_establish(SOFTINT_NET, bridge_forward, sc); 356 if (sc->sc_softintr == NULL) { 357 free(sc, M_DEVBUF); 358 return ENOMEM; 359 } 360 361 /* Initialize our routing table. */ 362 bridge_rtable_init(sc); 363 364 callout_init(&sc->sc_brcallout, 0); 365 callout_init(&sc->sc_bstpcallout, 0); 366 367 LIST_INIT(&sc->sc_iflist); 368 369 if_initname(ifp, ifc->ifc_name, unit); 370 ifp->if_softc = sc; 371 ifp->if_mtu = ETHERMTU; 372 ifp->if_ioctl = bridge_ioctl; 373 ifp->if_output = bridge_output; 374 ifp->if_start = bridge_start; 375 ifp->if_stop = bridge_stop; 376 ifp->if_init = bridge_init; 377 ifp->if_type = IFT_BRIDGE; 378 ifp->if_addrlen = 0; 379 ifp->if_dlt = DLT_EN10MB; 380 ifp->if_hdrlen = ETHER_HDR_LEN; 381 IFQ_SET_READY(&ifp->if_snd); 382 383 if_attach(ifp); 384 385 if_alloc_sadl(ifp); 386 387 s = splnet(); 388 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 389 splx(s); 390 391 return (0); 392 } 393 394 /* 395 * bridge_clone_destroy: 396 * 397 * Destroy a bridge instance. 398 */ 399 static int 400 bridge_clone_destroy(struct ifnet *ifp) 401 { 402 struct bridge_softc *sc = ifp->if_softc; 403 struct bridge_iflist *bif; 404 int s; 405 406 s = splnet(); 407 408 bridge_stop(ifp, 1); 409 410 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 411 bridge_delete_member(sc, bif); 412 413 LIST_REMOVE(sc, sc_list); 414 415 splx(s); 416 417 if_detach(ifp); 418 419 /* Tear down the routing table. */ 420 bridge_rtable_fini(sc); 421 422 softint_disestablish(sc->sc_softintr); 423 424 free(sc, M_DEVBUF); 425 426 return (0); 427 } 428 429 /* 430 * bridge_ioctl: 431 * 432 * Handle a control request from the operator. 433 */ 434 static int 435 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 436 { 437 struct bridge_softc *sc = ifp->if_softc; 438 struct lwp *l = curlwp; /* XXX */ 439 union { 440 struct ifbreq ifbreq; 441 struct ifbifconf ifbifconf; 442 struct ifbareq ifbareq; 443 struct ifbaconf ifbaconf; 444 struct ifbrparam ifbrparam; 445 } args; 446 struct ifdrv *ifd = (struct ifdrv *) data; 447 const struct bridge_control *bc = NULL; /* XXXGCC */ 448 int s, error = 0; 449 450 /* Authorize command before calling splnet(). */ 451 switch (cmd) { 452 case SIOCGDRVSPEC: 453 case SIOCSDRVSPEC: 454 if (ifd->ifd_cmd >= bridge_control_table_size) { 455 error = EINVAL; 456 return error; 457 } 458 459 bc = &bridge_control_table[ifd->ifd_cmd]; 460 461 /* We only care about BC_F_SUSER at this point. */ 462 if ((bc->bc_flags & BC_F_SUSER) == 0) 463 break; 464 465 error = kauth_authorize_generic(l->l_cred, 466 KAUTH_GENERIC_ISSUSER, NULL); 467 if (error) 468 return (error); 469 470 break; 471 } 472 473 s = splnet(); 474 475 switch (cmd) { 476 case SIOCGDRVSPEC: 477 case SIOCSDRVSPEC: 478 KASSERT(bc != NULL); 479 if (cmd == SIOCGDRVSPEC && 480 (bc->bc_flags & BC_F_COPYOUT) == 0) { 481 error = EINVAL; 482 break; 483 } 484 else if (cmd == SIOCSDRVSPEC && 485 (bc->bc_flags & BC_F_COPYOUT) != 0) { 486 error = EINVAL; 487 break; 488 } 489 490 /* BC_F_SUSER is checked above, before splnet(). */ 491 492 if (ifd->ifd_len != bc->bc_argsize || 493 ifd->ifd_len > sizeof(args)) { 494 error = EINVAL; 495 break; 496 } 497 498 memset(&args, 0, sizeof(args)); 499 if (bc->bc_flags & BC_F_COPYIN) { 500 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 501 if (error) 502 break; 503 } 504 505 error = (*bc->bc_func)(sc, &args); 506 if (error) 507 break; 508 509 if (bc->bc_flags & BC_F_COPYOUT) 510 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 511 512 break; 513 514 case SIOCSIFFLAGS: 515 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 516 break; 517 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 518 case IFF_RUNNING: 519 /* 520 * If interface is marked down and it is running, 521 * then stop and disable it. 522 */ 523 (*ifp->if_stop)(ifp, 1); 524 break; 525 case IFF_UP: 526 /* 527 * If interface is marked up and it is stopped, then 528 * start it. 529 */ 530 error = (*ifp->if_init)(ifp); 531 break; 532 default: 533 break; 534 } 535 break; 536 537 default: 538 error = ifioctl_common(ifp, cmd, data); 539 break; 540 } 541 542 splx(s); 543 544 return (error); 545 } 546 547 /* 548 * bridge_lookup_member: 549 * 550 * Lookup a bridge member interface. Must be called at splnet(). 551 */ 552 static struct bridge_iflist * 553 bridge_lookup_member(struct bridge_softc *sc, const char *name) 554 { 555 struct bridge_iflist *bif; 556 struct ifnet *ifp; 557 558 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 559 ifp = bif->bif_ifp; 560 if (strcmp(ifp->if_xname, name) == 0) 561 return (bif); 562 } 563 564 return (NULL); 565 } 566 567 /* 568 * bridge_lookup_member_if: 569 * 570 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 571 */ 572 static struct bridge_iflist * 573 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 574 { 575 struct bridge_iflist *bif; 576 577 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 578 if (bif->bif_ifp == member_ifp) 579 return (bif); 580 } 581 582 return (NULL); 583 } 584 585 /* 586 * bridge_delete_member: 587 * 588 * Delete the specified member interface. 589 */ 590 static void 591 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 592 { 593 struct ifnet *ifs = bif->bif_ifp; 594 595 switch (ifs->if_type) { 596 case IFT_ETHER: 597 /* 598 * Take the interface out of promiscuous mode. 599 */ 600 (void) ifpromisc(ifs, 0); 601 break; 602 default: 603 #ifdef DIAGNOSTIC 604 panic("bridge_delete_member: impossible"); 605 #endif 606 break; 607 } 608 609 ifs->if_bridge = NULL; 610 LIST_REMOVE(bif, bif_next); 611 612 bridge_rtdelete(sc, ifs); 613 614 free(bif, M_DEVBUF); 615 616 if (sc->sc_if.if_flags & IFF_RUNNING) 617 bstp_initialization(sc); 618 } 619 620 static int 621 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 622 { 623 struct ifbreq *req = arg; 624 struct bridge_iflist *bif = NULL; 625 struct ifnet *ifs; 626 int error = 0; 627 628 ifs = ifunit(req->ifbr_ifsname); 629 if (ifs == NULL) 630 return (ENOENT); 631 632 if (sc->sc_if.if_mtu != ifs->if_mtu) 633 return (EINVAL); 634 635 if (ifs->if_bridge == sc) 636 return (EEXIST); 637 638 if (ifs->if_bridge != NULL) 639 return (EBUSY); 640 641 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 642 if (bif == NULL) 643 return (ENOMEM); 644 645 switch (ifs->if_type) { 646 case IFT_ETHER: 647 /* 648 * Place the interface into promiscuous mode. 649 */ 650 error = ifpromisc(ifs, 1); 651 if (error) 652 goto out; 653 break; 654 default: 655 error = EINVAL; 656 goto out; 657 } 658 659 bif->bif_ifp = ifs; 660 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 661 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 662 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 663 664 ifs->if_bridge = sc; 665 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 666 667 if (sc->sc_if.if_flags & IFF_RUNNING) 668 bstp_initialization(sc); 669 else 670 bstp_stop(sc); 671 672 out: 673 if (error) { 674 if (bif != NULL) 675 free(bif, M_DEVBUF); 676 } 677 return (error); 678 } 679 680 static int 681 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 682 { 683 struct ifbreq *req = arg; 684 struct bridge_iflist *bif; 685 686 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 687 if (bif == NULL) 688 return (ENOENT); 689 690 bridge_delete_member(sc, bif); 691 692 return (0); 693 } 694 695 static int 696 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 697 { 698 struct ifbreq *req = arg; 699 struct bridge_iflist *bif; 700 701 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 702 if (bif == NULL) 703 return (ENOENT); 704 705 req->ifbr_ifsflags = bif->bif_flags; 706 req->ifbr_state = bif->bif_state; 707 req->ifbr_priority = bif->bif_priority; 708 req->ifbr_path_cost = bif->bif_path_cost; 709 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 710 711 return (0); 712 } 713 714 static int 715 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 716 { 717 struct ifbreq *req = arg; 718 struct bridge_iflist *bif; 719 720 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 721 if (bif == NULL) 722 return (ENOENT); 723 724 if (req->ifbr_ifsflags & IFBIF_STP) { 725 switch (bif->bif_ifp->if_type) { 726 case IFT_ETHER: 727 /* These can do spanning tree. */ 728 break; 729 730 default: 731 /* Nothing else can. */ 732 return (EINVAL); 733 } 734 } 735 736 bif->bif_flags = req->ifbr_ifsflags; 737 738 if (sc->sc_if.if_flags & IFF_RUNNING) 739 bstp_initialization(sc); 740 741 return (0); 742 } 743 744 static int 745 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 746 { 747 struct ifbrparam *param = arg; 748 749 sc->sc_brtmax = param->ifbrp_csize; 750 bridge_rttrim(sc); 751 752 return (0); 753 } 754 755 static int 756 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 757 { 758 struct ifbrparam *param = arg; 759 760 param->ifbrp_csize = sc->sc_brtmax; 761 762 return (0); 763 } 764 765 static int 766 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 767 { 768 struct ifbifconf *bifc = arg; 769 struct bridge_iflist *bif; 770 struct ifbreq breq; 771 int count, len, error = 0; 772 773 count = 0; 774 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 775 count++; 776 777 if (bifc->ifbic_len == 0) { 778 bifc->ifbic_len = sizeof(breq) * count; 779 return (0); 780 } 781 782 count = 0; 783 len = bifc->ifbic_len; 784 memset(&breq, 0, sizeof breq); 785 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 786 if (len < sizeof(breq)) 787 break; 788 789 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 790 sizeof(breq.ifbr_ifsname)); 791 breq.ifbr_ifsflags = bif->bif_flags; 792 breq.ifbr_state = bif->bif_state; 793 breq.ifbr_priority = bif->bif_priority; 794 breq.ifbr_path_cost = bif->bif_path_cost; 795 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 796 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 797 if (error) 798 break; 799 count++; 800 len -= sizeof(breq); 801 } 802 803 bifc->ifbic_len = sizeof(breq) * count; 804 return (error); 805 } 806 807 static int 808 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 809 { 810 struct ifbaconf *bac = arg; 811 struct bridge_rtnode *brt; 812 struct ifbareq bareq; 813 int count = 0, error = 0, len; 814 815 if (bac->ifbac_len == 0) 816 return (0); 817 818 len = bac->ifbac_len; 819 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 820 if (len < sizeof(bareq)) 821 goto out; 822 memset(&bareq, 0, sizeof(bareq)); 823 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 824 sizeof(bareq.ifba_ifsname)); 825 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 826 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 827 bareq.ifba_expire = brt->brt_expire - time_uptime; 828 } else 829 bareq.ifba_expire = 0; 830 bareq.ifba_flags = brt->brt_flags; 831 832 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 833 if (error) 834 goto out; 835 count++; 836 len -= sizeof(bareq); 837 } 838 out: 839 bac->ifbac_len = sizeof(bareq) * count; 840 return (error); 841 } 842 843 static int 844 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 845 { 846 struct ifbareq *req = arg; 847 struct bridge_iflist *bif; 848 int error; 849 850 bif = bridge_lookup_member(sc, req->ifba_ifsname); 851 if (bif == NULL) 852 return (ENOENT); 853 854 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 855 req->ifba_flags); 856 857 return (error); 858 } 859 860 static int 861 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 862 { 863 struct ifbrparam *param = arg; 864 865 sc->sc_brttimeout = param->ifbrp_ctime; 866 867 return (0); 868 } 869 870 static int 871 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 872 { 873 struct ifbrparam *param = arg; 874 875 param->ifbrp_ctime = sc->sc_brttimeout; 876 877 return (0); 878 } 879 880 static int 881 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 882 { 883 struct ifbareq *req = arg; 884 885 return (bridge_rtdaddr(sc, req->ifba_dst)); 886 } 887 888 static int 889 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 890 { 891 struct ifbreq *req = arg; 892 893 bridge_rtflush(sc, req->ifbr_ifsflags); 894 895 return (0); 896 } 897 898 static int 899 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 900 { 901 struct ifbrparam *param = arg; 902 903 param->ifbrp_prio = sc->sc_bridge_priority; 904 905 return (0); 906 } 907 908 static int 909 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 910 { 911 struct ifbrparam *param = arg; 912 913 sc->sc_bridge_priority = param->ifbrp_prio; 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_ght(struct bridge_softc *sc, void *arg) 923 { 924 struct ifbrparam *param = arg; 925 926 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 927 928 return (0); 929 } 930 931 static int 932 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 933 { 934 struct ifbrparam *param = arg; 935 936 if (param->ifbrp_hellotime == 0) 937 return (EINVAL); 938 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 939 940 if (sc->sc_if.if_flags & IFF_RUNNING) 941 bstp_initialization(sc); 942 943 return (0); 944 } 945 946 static int 947 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 948 { 949 struct ifbrparam *param = arg; 950 951 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 952 953 return (0); 954 } 955 956 static int 957 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 958 { 959 struct ifbrparam *param = arg; 960 961 if (param->ifbrp_fwddelay == 0) 962 return (EINVAL); 963 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 964 965 if (sc->sc_if.if_flags & IFF_RUNNING) 966 bstp_initialization(sc); 967 968 return (0); 969 } 970 971 static int 972 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 973 { 974 struct ifbrparam *param = arg; 975 976 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 977 978 return (0); 979 } 980 981 static int 982 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 983 { 984 struct ifbrparam *param = arg; 985 986 if (param->ifbrp_maxage == 0) 987 return (EINVAL); 988 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 989 990 if (sc->sc_if.if_flags & IFF_RUNNING) 991 bstp_initialization(sc); 992 993 return (0); 994 } 995 996 static int 997 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 998 { 999 struct ifbreq *req = arg; 1000 struct bridge_iflist *bif; 1001 1002 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1003 if (bif == NULL) 1004 return (ENOENT); 1005 1006 bif->bif_priority = req->ifbr_priority; 1007 1008 if (sc->sc_if.if_flags & IFF_RUNNING) 1009 bstp_initialization(sc); 1010 1011 return (0); 1012 } 1013 1014 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1015 static int 1016 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1017 { 1018 struct ifbrparam *param = arg; 1019 1020 param->ifbrp_filter = sc->sc_filter_flags; 1021 1022 return (0); 1023 } 1024 1025 static int 1026 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1027 { 1028 struct ifbrparam *param = arg; 1029 uint32_t nflags, oflags; 1030 1031 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1032 return (EINVAL); 1033 1034 nflags = param->ifbrp_filter; 1035 oflags = sc->sc_filter_flags; 1036 1037 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1038 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1039 &sc->sc_if.if_pfil); 1040 } 1041 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1042 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1043 &sc->sc_if.if_pfil); 1044 } 1045 1046 sc->sc_filter_flags = nflags; 1047 1048 return (0); 1049 } 1050 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1051 1052 static int 1053 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1054 { 1055 struct ifbreq *req = arg; 1056 struct bridge_iflist *bif; 1057 1058 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1059 if (bif == NULL) 1060 return (ENOENT); 1061 1062 bif->bif_path_cost = req->ifbr_path_cost; 1063 1064 if (sc->sc_if.if_flags & IFF_RUNNING) 1065 bstp_initialization(sc); 1066 1067 return (0); 1068 } 1069 1070 /* 1071 * bridge_ifdetach: 1072 * 1073 * Detach an interface from a bridge. Called when a member 1074 * interface is detaching. 1075 */ 1076 void 1077 bridge_ifdetach(struct ifnet *ifp) 1078 { 1079 struct bridge_softc *sc = ifp->if_bridge; 1080 struct ifbreq breq; 1081 1082 memset(&breq, 0, sizeof(breq)); 1083 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1084 1085 (void) bridge_ioctl_del(sc, &breq); 1086 } 1087 1088 /* 1089 * bridge_init: 1090 * 1091 * Initialize a bridge interface. 1092 */ 1093 static int 1094 bridge_init(struct ifnet *ifp) 1095 { 1096 struct bridge_softc *sc = ifp->if_softc; 1097 1098 if (ifp->if_flags & IFF_RUNNING) 1099 return (0); 1100 1101 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1102 bridge_timer, sc); 1103 1104 ifp->if_flags |= IFF_RUNNING; 1105 bstp_initialization(sc); 1106 return (0); 1107 } 1108 1109 /* 1110 * bridge_stop: 1111 * 1112 * Stop the bridge interface. 1113 */ 1114 static void 1115 bridge_stop(struct ifnet *ifp, int disable) 1116 { 1117 struct bridge_softc *sc = ifp->if_softc; 1118 1119 if ((ifp->if_flags & IFF_RUNNING) == 0) 1120 return; 1121 1122 callout_stop(&sc->sc_brcallout); 1123 bstp_stop(sc); 1124 1125 IF_PURGE(&ifp->if_snd); 1126 1127 bridge_rtflush(sc, IFBF_FLUSHDYN); 1128 1129 ifp->if_flags &= ~IFF_RUNNING; 1130 } 1131 1132 /* 1133 * bridge_enqueue: 1134 * 1135 * Enqueue a packet on a bridge member interface. 1136 * 1137 * NOTE: must be called at splnet(). 1138 */ 1139 void 1140 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1141 int runfilt) 1142 { 1143 ALTQ_DECL(struct altq_pktattr pktattr;) 1144 int len, error; 1145 short mflags; 1146 1147 /* 1148 * Clear any in-bound checksum flags for this packet. 1149 */ 1150 m->m_pkthdr.csum_flags = 0; 1151 1152 #ifdef PFIL_HOOKS 1153 if (runfilt) { 1154 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1155 dst_ifp, PFIL_OUT) != 0) { 1156 if (m != NULL) 1157 m_freem(m); 1158 return; 1159 } 1160 if (m == NULL) 1161 return; 1162 } 1163 #endif /* PFIL_HOOKS */ 1164 1165 #ifdef ALTQ 1166 /* 1167 * If ALTQ is enabled on the member interface, do 1168 * classification; the queueing discipline might 1169 * not require classification, but might require 1170 * the address family/header pointer in the pktattr. 1171 */ 1172 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1173 /* XXX IFT_ETHER */ 1174 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1175 } 1176 #endif /* ALTQ */ 1177 1178 len = m->m_pkthdr.len; 1179 m->m_flags |= M_PROTO1; 1180 mflags = m->m_flags; 1181 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1182 if (error) { 1183 /* mbuf is already freed */ 1184 sc->sc_if.if_oerrors++; 1185 return; 1186 } 1187 1188 sc->sc_if.if_opackets++; 1189 sc->sc_if.if_obytes += len; 1190 1191 dst_ifp->if_obytes += len; 1192 1193 if (mflags & M_MCAST) { 1194 sc->sc_if.if_omcasts++; 1195 dst_ifp->if_omcasts++; 1196 } 1197 1198 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1199 (*dst_ifp->if_start)(dst_ifp); 1200 } 1201 1202 /* 1203 * bridge_output: 1204 * 1205 * Send output from a bridge member interface. This 1206 * performs the bridging function for locally originated 1207 * packets. 1208 * 1209 * The mbuf has the Ethernet header already attached. We must 1210 * enqueue or free the mbuf before returning. 1211 */ 1212 int 1213 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1214 struct rtentry *rt) 1215 { 1216 struct ether_header *eh; 1217 struct ifnet *dst_if; 1218 struct bridge_softc *sc; 1219 int s; 1220 1221 if (m->m_len < ETHER_HDR_LEN) { 1222 m = m_pullup(m, ETHER_HDR_LEN); 1223 if (m == NULL) 1224 return (0); 1225 } 1226 1227 eh = mtod(m, struct ether_header *); 1228 sc = ifp->if_bridge; 1229 1230 s = splnet(); 1231 1232 /* 1233 * If bridge is down, but the original output interface is up, 1234 * go ahead and send out that interface. Otherwise, the packet 1235 * is dropped below. 1236 */ 1237 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1238 dst_if = ifp; 1239 goto sendunicast; 1240 } 1241 1242 /* 1243 * If the packet is a multicast, or we don't know a better way to 1244 * get there, send to all interfaces. 1245 */ 1246 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1247 dst_if = NULL; 1248 else 1249 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1250 if (dst_if == NULL) { 1251 struct bridge_iflist *bif; 1252 struct mbuf *mc; 1253 int used = 0; 1254 1255 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1256 dst_if = bif->bif_ifp; 1257 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1258 continue; 1259 1260 /* 1261 * If this is not the original output interface, 1262 * and the interface is participating in spanning 1263 * tree, make sure the port is in a state that 1264 * allows forwarding. 1265 */ 1266 if (dst_if != ifp && 1267 (bif->bif_flags & IFBIF_STP) != 0) { 1268 switch (bif->bif_state) { 1269 case BSTP_IFSTATE_BLOCKING: 1270 case BSTP_IFSTATE_LISTENING: 1271 case BSTP_IFSTATE_DISABLED: 1272 continue; 1273 } 1274 } 1275 1276 if (LIST_NEXT(bif, bif_next) == NULL) { 1277 used = 1; 1278 mc = m; 1279 } else { 1280 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1281 if (mc == NULL) { 1282 sc->sc_if.if_oerrors++; 1283 continue; 1284 } 1285 } 1286 1287 bridge_enqueue(sc, dst_if, mc, 0); 1288 } 1289 if (used == 0) 1290 m_freem(m); 1291 splx(s); 1292 return (0); 1293 } 1294 1295 sendunicast: 1296 /* 1297 * XXX Spanning tree consideration here? 1298 */ 1299 1300 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1301 m_freem(m); 1302 splx(s); 1303 return (0); 1304 } 1305 1306 bridge_enqueue(sc, dst_if, m, 0); 1307 1308 splx(s); 1309 return (0); 1310 } 1311 1312 /* 1313 * bridge_start: 1314 * 1315 * Start output on a bridge. 1316 * 1317 * NOTE: This routine should never be called in this implementation. 1318 */ 1319 static void 1320 bridge_start(struct ifnet *ifp) 1321 { 1322 1323 printf("%s: bridge_start() called\n", ifp->if_xname); 1324 } 1325 1326 /* 1327 * bridge_forward: 1328 * 1329 * The forwarding function of the bridge. 1330 */ 1331 static void 1332 bridge_forward(void *v) 1333 { 1334 struct bridge_softc *sc = v; 1335 struct mbuf *m; 1336 struct bridge_iflist *bif; 1337 struct ifnet *src_if, *dst_if; 1338 struct ether_header *eh; 1339 int s; 1340 1341 mutex_enter(softnet_lock); 1342 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1343 mutex_exit(softnet_lock); 1344 return; 1345 } 1346 1347 s = splnet(); 1348 while (1) { 1349 IFQ_POLL(&sc->sc_if.if_snd, m); 1350 if (m == NULL) 1351 break; 1352 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1353 1354 src_if = m->m_pkthdr.rcvif; 1355 1356 sc->sc_if.if_ipackets++; 1357 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1358 1359 /* 1360 * Look up the bridge_iflist. 1361 */ 1362 bif = bridge_lookup_member_if(sc, src_if); 1363 if (bif == NULL) { 1364 /* Interface is not a bridge member (anymore?) */ 1365 m_freem(m); 1366 continue; 1367 } 1368 1369 if (bif->bif_flags & IFBIF_STP) { 1370 switch (bif->bif_state) { 1371 case BSTP_IFSTATE_BLOCKING: 1372 case BSTP_IFSTATE_LISTENING: 1373 case BSTP_IFSTATE_DISABLED: 1374 m_freem(m); 1375 continue; 1376 } 1377 } 1378 1379 eh = mtod(m, struct ether_header *); 1380 1381 /* 1382 * If the interface is learning, and the source 1383 * address is valid and not multicast, record 1384 * the address. 1385 */ 1386 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1387 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1388 (eh->ether_shost[0] == 0 && 1389 eh->ether_shost[1] == 0 && 1390 eh->ether_shost[2] == 0 && 1391 eh->ether_shost[3] == 0 && 1392 eh->ether_shost[4] == 0 && 1393 eh->ether_shost[5] == 0) == 0) { 1394 (void) bridge_rtupdate(sc, eh->ether_shost, 1395 src_if, 0, IFBAF_DYNAMIC); 1396 } 1397 1398 if ((bif->bif_flags & IFBIF_STP) != 0 && 1399 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1400 m_freem(m); 1401 continue; 1402 } 1403 1404 /* 1405 * At this point, the port either doesn't participate 1406 * in spanning tree or it is in the forwarding state. 1407 */ 1408 1409 /* 1410 * If the packet is unicast, destined for someone on 1411 * "this" side of the bridge, drop it. 1412 */ 1413 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1414 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1415 if (src_if == dst_if) { 1416 m_freem(m); 1417 continue; 1418 } 1419 } else { 1420 /* ...forward it to all interfaces. */ 1421 sc->sc_if.if_imcasts++; 1422 dst_if = NULL; 1423 } 1424 1425 #ifdef PFIL_HOOKS 1426 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1427 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1428 if (m != NULL) 1429 m_freem(m); 1430 continue; 1431 } 1432 if (m == NULL) 1433 continue; 1434 #endif /* PFIL_HOOKS */ 1435 1436 if (dst_if == NULL) { 1437 bridge_broadcast(sc, src_if, m); 1438 continue; 1439 } 1440 1441 /* 1442 * At this point, we're dealing with a unicast frame 1443 * going to a different interface. 1444 */ 1445 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1446 m_freem(m); 1447 continue; 1448 } 1449 bif = bridge_lookup_member_if(sc, dst_if); 1450 if (bif == NULL) { 1451 /* Not a member of the bridge (anymore?) */ 1452 m_freem(m); 1453 continue; 1454 } 1455 1456 if (bif->bif_flags & IFBIF_STP) { 1457 switch (bif->bif_state) { 1458 case BSTP_IFSTATE_DISABLED: 1459 case BSTP_IFSTATE_BLOCKING: 1460 m_freem(m); 1461 continue; 1462 } 1463 } 1464 1465 bridge_enqueue(sc, dst_if, m, 1); 1466 } 1467 splx(s); 1468 mutex_exit(softnet_lock); 1469 } 1470 1471 /* 1472 * bridge_input: 1473 * 1474 * Receive input from a member interface. Queue the packet for 1475 * bridging if it is not for us. 1476 * should be called at splnet() 1477 */ 1478 struct mbuf * 1479 bridge_input(struct ifnet *ifp, struct mbuf *m) 1480 { 1481 struct bridge_softc *sc = ifp->if_bridge; 1482 struct bridge_iflist *bif; 1483 struct ether_header *eh; 1484 struct mbuf *mc; 1485 1486 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1487 return (m); 1488 1489 bif = bridge_lookup_member_if(sc, ifp); 1490 if (bif == NULL) 1491 return (m); 1492 1493 eh = mtod(m, struct ether_header *); 1494 1495 if (m->m_flags & (M_BCAST|M_MCAST)) { 1496 if (bif->bif_flags & IFBIF_STP) { 1497 /* Tap off 802.1D packets; they do not get forwarded. */ 1498 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1499 ETHER_ADDR_LEN) == 0) { 1500 m = bstp_input(sc, bif, m); 1501 if (m == NULL) 1502 return (NULL); 1503 } 1504 1505 switch (bif->bif_state) { 1506 case BSTP_IFSTATE_BLOCKING: 1507 case BSTP_IFSTATE_LISTENING: 1508 case BSTP_IFSTATE_DISABLED: 1509 return (m); 1510 } 1511 } 1512 1513 /* 1514 * Make a deep copy of the packet and enqueue the copy 1515 * for bridge processing; return the original packet for 1516 * local processing. 1517 */ 1518 if (IF_QFULL(&sc->sc_if.if_snd)) { 1519 IF_DROP(&sc->sc_if.if_snd); 1520 return (m); 1521 } 1522 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1523 if (mc == NULL) 1524 return (m); 1525 1526 /* Perform the bridge forwarding function with the copy. */ 1527 IF_ENQUEUE(&sc->sc_if.if_snd, mc); 1528 softint_schedule(sc->sc_softintr); 1529 1530 /* Return the original packet for local processing. */ 1531 return (m); 1532 } 1533 1534 if (bif->bif_flags & IFBIF_STP) { 1535 switch (bif->bif_state) { 1536 case BSTP_IFSTATE_BLOCKING: 1537 case BSTP_IFSTATE_LISTENING: 1538 case BSTP_IFSTATE_DISABLED: 1539 return (m); 1540 } 1541 } 1542 1543 /* 1544 * Unicast. Make sure it's not for us. 1545 */ 1546 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1547 /* It is destined for us. */ 1548 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1549 ETHER_ADDR_LEN) == 0 1550 #if NCARP > 0 1551 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1552 eh, IFT_ETHER, 0) != NULL) 1553 #endif /* NCARP > 0 */ 1554 ) { 1555 if (bif->bif_flags & IFBIF_LEARNING) 1556 (void) bridge_rtupdate(sc, 1557 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1558 m->m_pkthdr.rcvif = bif->bif_ifp; 1559 return (m); 1560 } 1561 1562 /* We just received a packet that we sent out. */ 1563 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1564 ETHER_ADDR_LEN) == 0 1565 #if NCARP > 0 1566 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1567 eh, IFT_ETHER, 1) != NULL) 1568 #endif /* NCARP > 0 */ 1569 ) { 1570 m_freem(m); 1571 return (NULL); 1572 } 1573 } 1574 1575 /* Perform the bridge forwarding function. */ 1576 if (IF_QFULL(&sc->sc_if.if_snd)) { 1577 IF_DROP(&sc->sc_if.if_snd); 1578 m_freem(m); 1579 return (NULL); 1580 } 1581 IF_ENQUEUE(&sc->sc_if.if_snd, m); 1582 softint_schedule(sc->sc_softintr); 1583 1584 return (NULL); 1585 } 1586 1587 /* 1588 * bridge_broadcast: 1589 * 1590 * Send a frame to all interfaces that are members of 1591 * the bridge, except for the one on which the packet 1592 * arrived. 1593 */ 1594 static void 1595 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1596 struct mbuf *m) 1597 { 1598 struct bridge_iflist *bif; 1599 struct mbuf *mc; 1600 struct ifnet *dst_if; 1601 int used = 0; 1602 1603 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1604 dst_if = bif->bif_ifp; 1605 if (dst_if == src_if) 1606 continue; 1607 1608 if (bif->bif_flags & IFBIF_STP) { 1609 switch (bif->bif_state) { 1610 case BSTP_IFSTATE_BLOCKING: 1611 case BSTP_IFSTATE_DISABLED: 1612 continue; 1613 } 1614 } 1615 1616 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1617 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1618 continue; 1619 1620 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1621 continue; 1622 1623 if (LIST_NEXT(bif, bif_next) == NULL) { 1624 mc = m; 1625 used = 1; 1626 } else { 1627 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1628 if (mc == NULL) { 1629 sc->sc_if.if_oerrors++; 1630 continue; 1631 } 1632 } 1633 1634 bridge_enqueue(sc, dst_if, mc, 1); 1635 } 1636 if (used == 0) 1637 m_freem(m); 1638 } 1639 1640 /* 1641 * bridge_rtupdate: 1642 * 1643 * Add a bridge routing entry. 1644 */ 1645 static int 1646 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1647 struct ifnet *dst_if, int setflags, uint8_t flags) 1648 { 1649 struct bridge_rtnode *brt; 1650 int error, s; 1651 1652 /* 1653 * A route for this destination might already exist. If so, 1654 * update it, otherwise create a new one. 1655 */ 1656 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1657 if (sc->sc_brtcnt >= sc->sc_brtmax) 1658 return (ENOSPC); 1659 1660 /* 1661 * Allocate a new bridge forwarding node, and 1662 * initialize the expiration time and Ethernet 1663 * address. 1664 */ 1665 s = splnet(); 1666 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1667 splx(s); 1668 if (brt == NULL) 1669 return (ENOMEM); 1670 1671 memset(brt, 0, sizeof(*brt)); 1672 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1673 brt->brt_flags = IFBAF_DYNAMIC; 1674 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1675 1676 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1677 s = splnet(); 1678 pool_put(&bridge_rtnode_pool, brt); 1679 splx(s); 1680 return (error); 1681 } 1682 } 1683 1684 brt->brt_ifp = dst_if; 1685 if (setflags) { 1686 brt->brt_flags = flags; 1687 if (flags & IFBAF_STATIC) 1688 brt->brt_expire = 0; 1689 else 1690 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1691 } 1692 1693 return (0); 1694 } 1695 1696 /* 1697 * bridge_rtlookup: 1698 * 1699 * Lookup the destination interface for an address. 1700 */ 1701 static struct ifnet * 1702 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1703 { 1704 struct bridge_rtnode *brt; 1705 1706 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1707 return (NULL); 1708 1709 return (brt->brt_ifp); 1710 } 1711 1712 /* 1713 * bridge_rttrim: 1714 * 1715 * Trim the routine table so that we have a number 1716 * of routing entries less than or equal to the 1717 * maximum number. 1718 */ 1719 static void 1720 bridge_rttrim(struct bridge_softc *sc) 1721 { 1722 struct bridge_rtnode *brt, *nbrt; 1723 1724 /* Make sure we actually need to do this. */ 1725 if (sc->sc_brtcnt <= sc->sc_brtmax) 1726 return; 1727 1728 /* Force an aging cycle; this might trim enough addresses. */ 1729 bridge_rtage(sc); 1730 if (sc->sc_brtcnt <= sc->sc_brtmax) 1731 return; 1732 1733 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1734 nbrt = LIST_NEXT(brt, brt_list); 1735 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1736 bridge_rtnode_destroy(sc, brt); 1737 if (sc->sc_brtcnt <= sc->sc_brtmax) 1738 return; 1739 } 1740 } 1741 } 1742 1743 /* 1744 * bridge_timer: 1745 * 1746 * Aging timer for the bridge. 1747 */ 1748 static void 1749 bridge_timer(void *arg) 1750 { 1751 struct bridge_softc *sc = arg; 1752 int s; 1753 1754 s = splnet(); 1755 bridge_rtage(sc); 1756 splx(s); 1757 1758 if (sc->sc_if.if_flags & IFF_RUNNING) 1759 callout_reset(&sc->sc_brcallout, 1760 bridge_rtable_prune_period * hz, bridge_timer, sc); 1761 } 1762 1763 /* 1764 * bridge_rtage: 1765 * 1766 * Perform an aging cycle. 1767 */ 1768 static void 1769 bridge_rtage(struct bridge_softc *sc) 1770 { 1771 struct bridge_rtnode *brt, *nbrt; 1772 1773 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1774 nbrt = LIST_NEXT(brt, brt_list); 1775 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1776 if (time_uptime >= brt->brt_expire) 1777 bridge_rtnode_destroy(sc, brt); 1778 } 1779 } 1780 } 1781 1782 /* 1783 * bridge_rtflush: 1784 * 1785 * Remove all dynamic addresses from the bridge. 1786 */ 1787 static void 1788 bridge_rtflush(struct bridge_softc *sc, int full) 1789 { 1790 struct bridge_rtnode *brt, *nbrt; 1791 1792 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1793 nbrt = LIST_NEXT(brt, brt_list); 1794 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1795 bridge_rtnode_destroy(sc, brt); 1796 } 1797 } 1798 1799 /* 1800 * bridge_rtdaddr: 1801 * 1802 * Remove an address from the table. 1803 */ 1804 static int 1805 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1806 { 1807 struct bridge_rtnode *brt; 1808 1809 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1810 return (ENOENT); 1811 1812 bridge_rtnode_destroy(sc, brt); 1813 return (0); 1814 } 1815 1816 /* 1817 * bridge_rtdelete: 1818 * 1819 * Delete routes to a speicifc member interface. 1820 */ 1821 static void 1822 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1823 { 1824 struct bridge_rtnode *brt, *nbrt; 1825 1826 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1827 nbrt = LIST_NEXT(brt, brt_list); 1828 if (brt->brt_ifp == ifp) 1829 bridge_rtnode_destroy(sc, brt); 1830 } 1831 } 1832 1833 /* 1834 * bridge_rtable_init: 1835 * 1836 * Initialize the route table for this bridge. 1837 */ 1838 static int 1839 bridge_rtable_init(struct bridge_softc *sc) 1840 { 1841 int i; 1842 1843 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1844 M_DEVBUF, M_NOWAIT); 1845 if (sc->sc_rthash == NULL) 1846 return (ENOMEM); 1847 1848 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1849 LIST_INIT(&sc->sc_rthash[i]); 1850 1851 sc->sc_rthash_key = arc4random(); 1852 1853 LIST_INIT(&sc->sc_rtlist); 1854 1855 return (0); 1856 } 1857 1858 /* 1859 * bridge_rtable_fini: 1860 * 1861 * Deconstruct the route table for this bridge. 1862 */ 1863 static void 1864 bridge_rtable_fini(struct bridge_softc *sc) 1865 { 1866 1867 free(sc->sc_rthash, M_DEVBUF); 1868 } 1869 1870 /* 1871 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1872 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1873 */ 1874 #define mix(a, b, c) \ 1875 do { \ 1876 a -= b; a -= c; a ^= (c >> 13); \ 1877 b -= c; b -= a; b ^= (a << 8); \ 1878 c -= a; c -= b; c ^= (b >> 13); \ 1879 a -= b; a -= c; a ^= (c >> 12); \ 1880 b -= c; b -= a; b ^= (a << 16); \ 1881 c -= a; c -= b; c ^= (b >> 5); \ 1882 a -= b; a -= c; a ^= (c >> 3); \ 1883 b -= c; b -= a; b ^= (a << 10); \ 1884 c -= a; c -= b; c ^= (b >> 15); \ 1885 } while (/*CONSTCOND*/0) 1886 1887 static inline uint32_t 1888 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1889 { 1890 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1891 1892 b += addr[5] << 8; 1893 b += addr[4]; 1894 a += addr[3] << 24; 1895 a += addr[2] << 16; 1896 a += addr[1] << 8; 1897 a += addr[0]; 1898 1899 mix(a, b, c); 1900 1901 return (c & BRIDGE_RTHASH_MASK); 1902 } 1903 1904 #undef mix 1905 1906 /* 1907 * bridge_rtnode_lookup: 1908 * 1909 * Look up a bridge route node for the specified destination. 1910 */ 1911 static struct bridge_rtnode * 1912 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1913 { 1914 struct bridge_rtnode *brt; 1915 uint32_t hash; 1916 int dir; 1917 1918 hash = bridge_rthash(sc, addr); 1919 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1920 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1921 if (dir == 0) 1922 return (brt); 1923 if (dir > 0) 1924 return (NULL); 1925 } 1926 1927 return (NULL); 1928 } 1929 1930 /* 1931 * bridge_rtnode_insert: 1932 * 1933 * Insert the specified bridge node into the route table. We 1934 * assume the entry is not already in the table. 1935 */ 1936 static int 1937 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1938 { 1939 struct bridge_rtnode *lbrt; 1940 uint32_t hash; 1941 int dir; 1942 1943 hash = bridge_rthash(sc, brt->brt_addr); 1944 1945 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1946 if (lbrt == NULL) { 1947 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1948 goto out; 1949 } 1950 1951 do { 1952 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1953 if (dir == 0) 1954 return (EEXIST); 1955 if (dir > 0) { 1956 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1957 goto out; 1958 } 1959 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1960 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1961 goto out; 1962 } 1963 lbrt = LIST_NEXT(lbrt, brt_hash); 1964 } while (lbrt != NULL); 1965 1966 #ifdef DIAGNOSTIC 1967 panic("bridge_rtnode_insert: impossible"); 1968 #endif 1969 1970 out: 1971 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1972 sc->sc_brtcnt++; 1973 1974 return (0); 1975 } 1976 1977 /* 1978 * bridge_rtnode_destroy: 1979 * 1980 * Destroy a bridge rtnode. 1981 */ 1982 static void 1983 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1984 { 1985 int s = splnet(); 1986 1987 LIST_REMOVE(brt, brt_hash); 1988 1989 LIST_REMOVE(brt, brt_list); 1990 sc->sc_brtcnt--; 1991 pool_put(&bridge_rtnode_pool, brt); 1992 1993 splx(s); 1994 } 1995 1996 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1997 extern struct pfil_head inet_pfil_hook; /* XXX */ 1998 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1999 2000 /* 2001 * Send bridge packets through IPF if they are one of the types IPF can deal 2002 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2003 * question.) 2004 */ 2005 static int 2006 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2007 { 2008 int snap, error; 2009 struct ether_header *eh1, eh2; 2010 struct llc llc1; 2011 uint16_t ether_type; 2012 2013 snap = 0; 2014 error = -1; /* Default error if not error == 0 */ 2015 eh1 = mtod(*mp, struct ether_header *); 2016 ether_type = ntohs(eh1->ether_type); 2017 2018 /* 2019 * Check for SNAP/LLC. 2020 */ 2021 if (ether_type < ETHERMTU) { 2022 struct llc *llc2 = (struct llc *)(eh1 + 1); 2023 2024 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2025 llc2->llc_dsap == LLC_SNAP_LSAP && 2026 llc2->llc_ssap == LLC_SNAP_LSAP && 2027 llc2->llc_control == LLC_UI) { 2028 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2029 snap = 1; 2030 } 2031 } 2032 2033 /* 2034 * If we're trying to filter bridge traffic, don't look at anything 2035 * other than IP and ARP traffic. If the filter doesn't understand 2036 * IPv6, don't allow IPv6 through the bridge either. This is lame 2037 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2038 * but of course we don't have an AppleTalk filter to begin with. 2039 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2040 * ARP traffic.) 2041 */ 2042 switch (ether_type) { 2043 case ETHERTYPE_ARP: 2044 case ETHERTYPE_REVARP: 2045 return 0; /* Automatically pass */ 2046 case ETHERTYPE_IP: 2047 # ifdef INET6 2048 case ETHERTYPE_IPV6: 2049 # endif /* INET6 */ 2050 break; 2051 default: 2052 goto bad; 2053 } 2054 2055 /* Strip off the Ethernet header and keep a copy. */ 2056 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2057 m_adj(*mp, ETHER_HDR_LEN); 2058 2059 /* Strip off snap header, if present */ 2060 if (snap) { 2061 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2062 m_adj(*mp, sizeof(struct llc)); 2063 } 2064 2065 /* 2066 * Check basic packet sanity and run IPF through pfil. 2067 */ 2068 KASSERT(!cpu_intr_p()); 2069 switch (ether_type) 2070 { 2071 case ETHERTYPE_IP : 2072 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2073 if (error == 0) 2074 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2075 break; 2076 # ifdef INET6 2077 case ETHERTYPE_IPV6 : 2078 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2079 if (error == 0) 2080 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2081 break; 2082 # endif 2083 default : 2084 error = 0; 2085 break; 2086 } 2087 2088 if (*mp == NULL) 2089 return error; 2090 if (error != 0) 2091 goto bad; 2092 2093 error = -1; 2094 2095 /* 2096 * Finally, put everything back the way it was and return 2097 */ 2098 if (snap) { 2099 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2100 if (*mp == NULL) 2101 return error; 2102 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2103 } 2104 2105 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2106 if (*mp == NULL) 2107 return error; 2108 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2109 2110 return 0; 2111 2112 bad: 2113 m_freem(*mp); 2114 *mp = NULL; 2115 return error; 2116 } 2117 2118 /* 2119 * Perform basic checks on header size since 2120 * IPF assumes ip_input has already processed 2121 * it for it. Cut-and-pasted from ip_input.c. 2122 * Given how simple the IPv6 version is, 2123 * does the IPv4 version really need to be 2124 * this complicated? 2125 * 2126 * XXX Should we update ipstat here, or not? 2127 * XXX Right now we update ipstat but not 2128 * XXX csum_counter. 2129 */ 2130 static int 2131 bridge_ip_checkbasic(struct mbuf **mp) 2132 { 2133 struct mbuf *m = *mp; 2134 struct ip *ip; 2135 int len, hlen; 2136 2137 if (*mp == NULL) 2138 return -1; 2139 2140 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2141 if ((m = m_copyup(m, sizeof(struct ip), 2142 (max_linkhdr + 3) & ~3)) == NULL) { 2143 /* XXXJRT new stat, please */ 2144 ip_statinc(IP_STAT_TOOSMALL); 2145 goto bad; 2146 } 2147 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2148 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2149 ip_statinc(IP_STAT_TOOSMALL); 2150 goto bad; 2151 } 2152 } 2153 ip = mtod(m, struct ip *); 2154 if (ip == NULL) goto bad; 2155 2156 if (ip->ip_v != IPVERSION) { 2157 ip_statinc(IP_STAT_BADVERS); 2158 goto bad; 2159 } 2160 hlen = ip->ip_hl << 2; 2161 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2162 ip_statinc(IP_STAT_BADHLEN); 2163 goto bad; 2164 } 2165 if (hlen > m->m_len) { 2166 if ((m = m_pullup(m, hlen)) == 0) { 2167 ip_statinc(IP_STAT_BADHLEN); 2168 goto bad; 2169 } 2170 ip = mtod(m, struct ip *); 2171 if (ip == NULL) goto bad; 2172 } 2173 2174 switch (m->m_pkthdr.csum_flags & 2175 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2176 M_CSUM_IPv4_BAD)) { 2177 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2178 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2179 goto bad; 2180 2181 case M_CSUM_IPv4: 2182 /* Checksum was okay. */ 2183 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2184 break; 2185 2186 default: 2187 /* Must compute it ourselves. */ 2188 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2189 if (in_cksum(m, hlen) != 0) 2190 goto bad; 2191 break; 2192 } 2193 2194 /* Retrieve the packet length. */ 2195 len = ntohs(ip->ip_len); 2196 2197 /* 2198 * Check for additional length bogosity 2199 */ 2200 if (len < hlen) { 2201 ip_statinc(IP_STAT_BADLEN); 2202 goto bad; 2203 } 2204 2205 /* 2206 * Check that the amount of data in the buffers 2207 * is as at least much as the IP header would have us expect. 2208 * Drop packet if shorter than we expect. 2209 */ 2210 if (m->m_pkthdr.len < len) { 2211 ip_statinc(IP_STAT_TOOSHORT); 2212 goto bad; 2213 } 2214 2215 /* Checks out, proceed */ 2216 *mp = m; 2217 return 0; 2218 2219 bad: 2220 *mp = m; 2221 return -1; 2222 } 2223 2224 # ifdef INET6 2225 /* 2226 * Same as above, but for IPv6. 2227 * Cut-and-pasted from ip6_input.c. 2228 * XXX Should we update ip6stat, or not? 2229 */ 2230 static int 2231 bridge_ip6_checkbasic(struct mbuf **mp) 2232 { 2233 struct mbuf *m = *mp; 2234 struct ip6_hdr *ip6; 2235 2236 /* 2237 * If the IPv6 header is not aligned, slurp it up into a new 2238 * mbuf with space for link headers, in the event we forward 2239 * it. Otherwise, if it is aligned, make sure the entire base 2240 * IPv6 header is in the first mbuf of the chain. 2241 */ 2242 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2243 struct ifnet *inifp = m->m_pkthdr.rcvif; 2244 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2245 (max_linkhdr + 3) & ~3)) == NULL) { 2246 /* XXXJRT new stat, please */ 2247 ip6_statinc(IP6_STAT_TOOSMALL); 2248 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2249 goto bad; 2250 } 2251 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2252 struct ifnet *inifp = m->m_pkthdr.rcvif; 2253 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2254 ip6_statinc(IP6_STAT_TOOSMALL); 2255 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2256 goto bad; 2257 } 2258 } 2259 2260 ip6 = mtod(m, struct ip6_hdr *); 2261 2262 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2263 ip6_statinc(IP6_STAT_BADVERS); 2264 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2265 goto bad; 2266 } 2267 2268 /* Checks out, proceed */ 2269 *mp = m; 2270 return 0; 2271 2272 bad: 2273 *mp = m; 2274 return -1; 2275 } 2276 # endif /* INET6 */ 2277 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2278
Indexes created Tue Sep 23 02:09:52 GMT 2025