if_bridge.c revision 1.66
1 /* $NetBSD: if_bridge.c,v 1.66 2009/04/04 15:31:47 bouyer 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 1.66 2009/04/04 15:31:47 bouyer Exp $"); 84 85 #include "opt_bridge_ipf.h" 86 #include "opt_inet.h" 87 #include "opt_pfil_hooks.h" 88 #include "bpfilter.h" 89 90 #include <sys/param.h> 91 #include <sys/kernel.h> 92 #include <sys/mbuf.h> 93 #include <sys/queue.h> 94 #include <sys/socket.h> 95 #include <sys/sockio.h> 96 #include <sys/systm.h> 97 #include <sys/proc.h> 98 #include <sys/pool.h> 99 #include <sys/kauth.h> 100 #include <sys/cpu.h> 101 102 #if NBPFILTER > 0 103 #include <net/bpf.h> 104 #endif 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; 448 int s, error = 0; 449 450 s = splnet(); 451 452 switch (cmd) { 453 case SIOCGDRVSPEC: 454 case SIOCSDRVSPEC: 455 if (ifd->ifd_cmd >= bridge_control_table_size) { 456 error = EINVAL; 457 break; 458 } 459 bc = &bridge_control_table[ifd->ifd_cmd]; 460 461 if (cmd == SIOCGDRVSPEC && 462 (bc->bc_flags & BC_F_COPYOUT) == 0) { 463 error = EINVAL; 464 break; 465 } 466 else if (cmd == SIOCSDRVSPEC && 467 (bc->bc_flags & BC_F_COPYOUT) != 0) { 468 error = EINVAL; 469 break; 470 } 471 472 if (bc->bc_flags & BC_F_SUSER) { 473 error = kauth_authorize_generic(l->l_cred, 474 KAUTH_GENERIC_ISSUSER, NULL); 475 if (error) 476 break; 477 } 478 479 if (ifd->ifd_len != bc->bc_argsize || 480 ifd->ifd_len > sizeof(args)) { 481 error = EINVAL; 482 break; 483 } 484 485 memset(&args, 0, sizeof(args)); 486 if (bc->bc_flags & BC_F_COPYIN) { 487 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 488 if (error) 489 break; 490 } 491 492 error = (*bc->bc_func)(sc, &args); 493 if (error) 494 break; 495 496 if (bc->bc_flags & BC_F_COPYOUT) 497 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 498 499 break; 500 501 case SIOCSIFFLAGS: 502 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 503 break; 504 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 505 case IFF_RUNNING: 506 /* 507 * If interface is marked down and it is running, 508 * then stop and disable it. 509 */ 510 (*ifp->if_stop)(ifp, 1); 511 break; 512 case IFF_UP: 513 /* 514 * If interface is marked up and it is stopped, then 515 * start it. 516 */ 517 error = (*ifp->if_init)(ifp); 518 break; 519 default: 520 break; 521 } 522 break; 523 524 default: 525 error = ifioctl_common(ifp, cmd, data); 526 break; 527 } 528 529 splx(s); 530 531 return (error); 532 } 533 534 /* 535 * bridge_lookup_member: 536 * 537 * Lookup a bridge member interface. Must be called at splnet(). 538 */ 539 static struct bridge_iflist * 540 bridge_lookup_member(struct bridge_softc *sc, const char *name) 541 { 542 struct bridge_iflist *bif; 543 struct ifnet *ifp; 544 545 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 546 ifp = bif->bif_ifp; 547 if (strcmp(ifp->if_xname, name) == 0) 548 return (bif); 549 } 550 551 return (NULL); 552 } 553 554 /* 555 * bridge_lookup_member_if: 556 * 557 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 558 */ 559 static struct bridge_iflist * 560 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 561 { 562 struct bridge_iflist *bif; 563 564 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 565 if (bif->bif_ifp == member_ifp) 566 return (bif); 567 } 568 569 return (NULL); 570 } 571 572 /* 573 * bridge_delete_member: 574 * 575 * Delete the specified member interface. 576 */ 577 static void 578 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 579 { 580 struct ifnet *ifs = bif->bif_ifp; 581 582 switch (ifs->if_type) { 583 case IFT_ETHER: 584 /* 585 * Take the interface out of promiscuous mode. 586 */ 587 (void) ifpromisc(ifs, 0); 588 break; 589 default: 590 #ifdef DIAGNOSTIC 591 panic("bridge_delete_member: impossible"); 592 #endif 593 break; 594 } 595 596 ifs->if_bridge = NULL; 597 LIST_REMOVE(bif, bif_next); 598 599 bridge_rtdelete(sc, ifs); 600 601 free(bif, M_DEVBUF); 602 603 if (sc->sc_if.if_flags & IFF_RUNNING) 604 bstp_initialization(sc); 605 } 606 607 static int 608 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 609 { 610 struct ifbreq *req = arg; 611 struct bridge_iflist *bif = NULL; 612 struct ifnet *ifs; 613 int error = 0; 614 615 ifs = ifunit(req->ifbr_ifsname); 616 if (ifs == NULL) 617 return (ENOENT); 618 619 if (sc->sc_if.if_mtu != ifs->if_mtu) 620 return (EINVAL); 621 622 if (ifs->if_bridge == sc) 623 return (EEXIST); 624 625 if (ifs->if_bridge != NULL) 626 return (EBUSY); 627 628 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 629 if (bif == NULL) 630 return (ENOMEM); 631 632 switch (ifs->if_type) { 633 case IFT_ETHER: 634 /* 635 * Place the interface into promiscuous mode. 636 */ 637 error = ifpromisc(ifs, 1); 638 if (error) 639 goto out; 640 break; 641 default: 642 error = EINVAL; 643 goto out; 644 } 645 646 bif->bif_ifp = ifs; 647 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 648 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 649 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 650 651 ifs->if_bridge = sc; 652 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 653 654 if (sc->sc_if.if_flags & IFF_RUNNING) 655 bstp_initialization(sc); 656 else 657 bstp_stop(sc); 658 659 out: 660 if (error) { 661 if (bif != NULL) 662 free(bif, M_DEVBUF); 663 } 664 return (error); 665 } 666 667 static int 668 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 669 { 670 struct ifbreq *req = arg; 671 struct bridge_iflist *bif; 672 673 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 674 if (bif == NULL) 675 return (ENOENT); 676 677 bridge_delete_member(sc, bif); 678 679 return (0); 680 } 681 682 static int 683 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 684 { 685 struct ifbreq *req = arg; 686 struct bridge_iflist *bif; 687 688 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 689 if (bif == NULL) 690 return (ENOENT); 691 692 req->ifbr_ifsflags = bif->bif_flags; 693 req->ifbr_state = bif->bif_state; 694 req->ifbr_priority = bif->bif_priority; 695 req->ifbr_path_cost = bif->bif_path_cost; 696 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 697 698 return (0); 699 } 700 701 static int 702 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 703 { 704 struct ifbreq *req = arg; 705 struct bridge_iflist *bif; 706 707 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 708 if (bif == NULL) 709 return (ENOENT); 710 711 if (req->ifbr_ifsflags & IFBIF_STP) { 712 switch (bif->bif_ifp->if_type) { 713 case IFT_ETHER: 714 /* These can do spanning tree. */ 715 break; 716 717 default: 718 /* Nothing else can. */ 719 return (EINVAL); 720 } 721 } 722 723 bif->bif_flags = req->ifbr_ifsflags; 724 725 if (sc->sc_if.if_flags & IFF_RUNNING) 726 bstp_initialization(sc); 727 728 return (0); 729 } 730 731 static int 732 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 733 { 734 struct ifbrparam *param = arg; 735 736 sc->sc_brtmax = param->ifbrp_csize; 737 bridge_rttrim(sc); 738 739 return (0); 740 } 741 742 static int 743 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 744 { 745 struct ifbrparam *param = arg; 746 747 param->ifbrp_csize = sc->sc_brtmax; 748 749 return (0); 750 } 751 752 static int 753 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 754 { 755 struct ifbifconf *bifc = arg; 756 struct bridge_iflist *bif; 757 struct ifbreq breq; 758 int count, len, error = 0; 759 760 count = 0; 761 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 762 count++; 763 764 if (bifc->ifbic_len == 0) { 765 bifc->ifbic_len = sizeof(breq) * count; 766 return (0); 767 } 768 769 count = 0; 770 len = bifc->ifbic_len; 771 memset(&breq, 0, sizeof breq); 772 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 773 if (len < sizeof(breq)) 774 break; 775 776 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 777 sizeof(breq.ifbr_ifsname)); 778 breq.ifbr_ifsflags = bif->bif_flags; 779 breq.ifbr_state = bif->bif_state; 780 breq.ifbr_priority = bif->bif_priority; 781 breq.ifbr_path_cost = bif->bif_path_cost; 782 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 783 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 784 if (error) 785 break; 786 count++; 787 len -= sizeof(breq); 788 } 789 790 bifc->ifbic_len = sizeof(breq) * count; 791 return (error); 792 } 793 794 static int 795 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 796 { 797 struct ifbaconf *bac = arg; 798 struct bridge_rtnode *brt; 799 struct ifbareq bareq; 800 int count = 0, error = 0, len; 801 802 if (bac->ifbac_len == 0) 803 return (0); 804 805 len = bac->ifbac_len; 806 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 807 if (len < sizeof(bareq)) 808 goto out; 809 memset(&bareq, 0, sizeof(bareq)); 810 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 811 sizeof(bareq.ifba_ifsname)); 812 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 813 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 814 bareq.ifba_expire = brt->brt_expire - time_uptime; 815 } else 816 bareq.ifba_expire = 0; 817 bareq.ifba_flags = brt->brt_flags; 818 819 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 820 if (error) 821 goto out; 822 count++; 823 len -= sizeof(bareq); 824 } 825 out: 826 bac->ifbac_len = sizeof(bareq) * count; 827 return (error); 828 } 829 830 static int 831 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 832 { 833 struct ifbareq *req = arg; 834 struct bridge_iflist *bif; 835 int error; 836 837 bif = bridge_lookup_member(sc, req->ifba_ifsname); 838 if (bif == NULL) 839 return (ENOENT); 840 841 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 842 req->ifba_flags); 843 844 return (error); 845 } 846 847 static int 848 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 849 { 850 struct ifbrparam *param = arg; 851 852 sc->sc_brttimeout = param->ifbrp_ctime; 853 854 return (0); 855 } 856 857 static int 858 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 859 { 860 struct ifbrparam *param = arg; 861 862 param->ifbrp_ctime = sc->sc_brttimeout; 863 864 return (0); 865 } 866 867 static int 868 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 869 { 870 struct ifbareq *req = arg; 871 872 return (bridge_rtdaddr(sc, req->ifba_dst)); 873 } 874 875 static int 876 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 877 { 878 struct ifbreq *req = arg; 879 880 bridge_rtflush(sc, req->ifbr_ifsflags); 881 882 return (0); 883 } 884 885 static int 886 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 887 { 888 struct ifbrparam *param = arg; 889 890 param->ifbrp_prio = sc->sc_bridge_priority; 891 892 return (0); 893 } 894 895 static int 896 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 897 { 898 struct ifbrparam *param = arg; 899 900 sc->sc_bridge_priority = param->ifbrp_prio; 901 902 if (sc->sc_if.if_flags & IFF_RUNNING) 903 bstp_initialization(sc); 904 905 return (0); 906 } 907 908 static int 909 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 910 { 911 struct ifbrparam *param = arg; 912 913 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 914 915 return (0); 916 } 917 918 static int 919 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 920 { 921 struct ifbrparam *param = arg; 922 923 if (param->ifbrp_hellotime == 0) 924 return (EINVAL); 925 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 926 927 if (sc->sc_if.if_flags & IFF_RUNNING) 928 bstp_initialization(sc); 929 930 return (0); 931 } 932 933 static int 934 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 935 { 936 struct ifbrparam *param = arg; 937 938 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 939 940 return (0); 941 } 942 943 static int 944 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 945 { 946 struct ifbrparam *param = arg; 947 948 if (param->ifbrp_fwddelay == 0) 949 return (EINVAL); 950 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 951 952 if (sc->sc_if.if_flags & IFF_RUNNING) 953 bstp_initialization(sc); 954 955 return (0); 956 } 957 958 static int 959 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 960 { 961 struct ifbrparam *param = arg; 962 963 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 964 965 return (0); 966 } 967 968 static int 969 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 970 { 971 struct ifbrparam *param = arg; 972 973 if (param->ifbrp_maxage == 0) 974 return (EINVAL); 975 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 976 977 if (sc->sc_if.if_flags & IFF_RUNNING) 978 bstp_initialization(sc); 979 980 return (0); 981 } 982 983 static int 984 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 985 { 986 struct ifbreq *req = arg; 987 struct bridge_iflist *bif; 988 989 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 990 if (bif == NULL) 991 return (ENOENT); 992 993 bif->bif_priority = req->ifbr_priority; 994 995 if (sc->sc_if.if_flags & IFF_RUNNING) 996 bstp_initialization(sc); 997 998 return (0); 999 } 1000 1001 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1002 static int 1003 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1004 { 1005 struct ifbrparam *param = arg; 1006 1007 param->ifbrp_filter = sc->sc_filter_flags; 1008 1009 return (0); 1010 } 1011 1012 static int 1013 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1014 { 1015 struct ifbrparam *param = arg; 1016 uint32_t nflags, oflags; 1017 1018 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1019 return (EINVAL); 1020 1021 nflags = param->ifbrp_filter; 1022 oflags = sc->sc_filter_flags; 1023 1024 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1025 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1026 &sc->sc_if.if_pfil); 1027 } 1028 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1029 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1030 &sc->sc_if.if_pfil); 1031 } 1032 1033 sc->sc_filter_flags = nflags; 1034 1035 return (0); 1036 } 1037 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1038 1039 static int 1040 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1041 { 1042 struct ifbreq *req = arg; 1043 struct bridge_iflist *bif; 1044 1045 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1046 if (bif == NULL) 1047 return (ENOENT); 1048 1049 bif->bif_path_cost = req->ifbr_path_cost; 1050 1051 if (sc->sc_if.if_flags & IFF_RUNNING) 1052 bstp_initialization(sc); 1053 1054 return (0); 1055 } 1056 1057 /* 1058 * bridge_ifdetach: 1059 * 1060 * Detach an interface from a bridge. Called when a member 1061 * interface is detaching. 1062 */ 1063 void 1064 bridge_ifdetach(struct ifnet *ifp) 1065 { 1066 struct bridge_softc *sc = ifp->if_bridge; 1067 struct ifbreq breq; 1068 1069 memset(&breq, 0, sizeof(breq)); 1070 snprintf(breq.ifbr_ifsname, sizeof(breq.ifbr_ifsname), ifp->if_xname); 1071 1072 (void) bridge_ioctl_del(sc, &breq); 1073 } 1074 1075 /* 1076 * bridge_init: 1077 * 1078 * Initialize a bridge interface. 1079 */ 1080 static int 1081 bridge_init(struct ifnet *ifp) 1082 { 1083 struct bridge_softc *sc = ifp->if_softc; 1084 1085 if (ifp->if_flags & IFF_RUNNING) 1086 return (0); 1087 1088 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1089 bridge_timer, sc); 1090 1091 ifp->if_flags |= IFF_RUNNING; 1092 bstp_initialization(sc); 1093 return (0); 1094 } 1095 1096 /* 1097 * bridge_stop: 1098 * 1099 * Stop the bridge interface. 1100 */ 1101 static void 1102 bridge_stop(struct ifnet *ifp, int disable) 1103 { 1104 struct bridge_softc *sc = ifp->if_softc; 1105 1106 if ((ifp->if_flags & IFF_RUNNING) == 0) 1107 return; 1108 1109 callout_stop(&sc->sc_brcallout); 1110 bstp_stop(sc); 1111 1112 IF_PURGE(&ifp->if_snd); 1113 1114 bridge_rtflush(sc, IFBF_FLUSHDYN); 1115 1116 ifp->if_flags &= ~IFF_RUNNING; 1117 } 1118 1119 /* 1120 * bridge_enqueue: 1121 * 1122 * Enqueue a packet on a bridge member interface. 1123 * 1124 * NOTE: must be called at splnet(). 1125 */ 1126 void 1127 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1128 int runfilt) 1129 { 1130 ALTQ_DECL(struct altq_pktattr pktattr;) 1131 int len, error; 1132 short mflags; 1133 1134 /* 1135 * Clear any in-bound checksum flags for this packet. 1136 */ 1137 m->m_pkthdr.csum_flags = 0; 1138 1139 #ifdef PFIL_HOOKS 1140 if (runfilt) { 1141 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1142 dst_ifp, PFIL_OUT) != 0) { 1143 if (m != NULL) 1144 m_freem(m); 1145 return; 1146 } 1147 if (m == NULL) 1148 return; 1149 } 1150 #endif /* PFIL_HOOKS */ 1151 1152 #ifdef ALTQ 1153 /* 1154 * If ALTQ is enabled on the member interface, do 1155 * classification; the queueing discipline might 1156 * not require classification, but might require 1157 * the address family/header pointer in the pktattr. 1158 */ 1159 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1160 /* XXX IFT_ETHER */ 1161 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1162 } 1163 #endif /* ALTQ */ 1164 1165 len = m->m_pkthdr.len; 1166 m->m_flags |= M_PROTO1; 1167 mflags = m->m_flags; 1168 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1169 if (error) { 1170 /* mbuf is already freed */ 1171 sc->sc_if.if_oerrors++; 1172 return; 1173 } 1174 1175 sc->sc_if.if_opackets++; 1176 sc->sc_if.if_obytes += len; 1177 1178 dst_ifp->if_obytes += len; 1179 1180 if (mflags & M_MCAST) { 1181 sc->sc_if.if_omcasts++; 1182 dst_ifp->if_omcasts++; 1183 } 1184 1185 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1186 (*dst_ifp->if_start)(dst_ifp); 1187 } 1188 1189 /* 1190 * bridge_output: 1191 * 1192 * Send output from a bridge member interface. This 1193 * performs the bridging function for locally originated 1194 * packets. 1195 * 1196 * The mbuf has the Ethernet header already attached. We must 1197 * enqueue or free the mbuf before returning. 1198 */ 1199 int 1200 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1201 struct rtentry *rt) 1202 { 1203 struct ether_header *eh; 1204 struct ifnet *dst_if; 1205 struct bridge_softc *sc; 1206 int s; 1207 1208 if (m->m_len < ETHER_HDR_LEN) { 1209 m = m_pullup(m, ETHER_HDR_LEN); 1210 if (m == NULL) 1211 return (0); 1212 } 1213 1214 eh = mtod(m, struct ether_header *); 1215 sc = ifp->if_bridge; 1216 1217 s = splnet(); 1218 1219 /* 1220 * If bridge is down, but the original output interface is up, 1221 * go ahead and send out that interface. Otherwise, the packet 1222 * is dropped below. 1223 */ 1224 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1225 dst_if = ifp; 1226 goto sendunicast; 1227 } 1228 1229 /* 1230 * If the packet is a multicast, or we don't know a better way to 1231 * get there, send to all interfaces. 1232 */ 1233 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1234 dst_if = NULL; 1235 else 1236 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1237 if (dst_if == NULL) { 1238 struct bridge_iflist *bif; 1239 struct mbuf *mc; 1240 int used = 0; 1241 1242 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1243 dst_if = bif->bif_ifp; 1244 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1245 continue; 1246 1247 /* 1248 * If this is not the original output interface, 1249 * and the interface is participating in spanning 1250 * tree, make sure the port is in a state that 1251 * allows forwarding. 1252 */ 1253 if (dst_if != ifp && 1254 (bif->bif_flags & IFBIF_STP) != 0) { 1255 switch (bif->bif_state) { 1256 case BSTP_IFSTATE_BLOCKING: 1257 case BSTP_IFSTATE_LISTENING: 1258 case BSTP_IFSTATE_DISABLED: 1259 continue; 1260 } 1261 } 1262 1263 if (LIST_NEXT(bif, bif_next) == NULL) { 1264 used = 1; 1265 mc = m; 1266 } else { 1267 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1268 if (mc == NULL) { 1269 sc->sc_if.if_oerrors++; 1270 continue; 1271 } 1272 } 1273 1274 bridge_enqueue(sc, dst_if, mc, 0); 1275 } 1276 if (used == 0) 1277 m_freem(m); 1278 splx(s); 1279 return (0); 1280 } 1281 1282 sendunicast: 1283 /* 1284 * XXX Spanning tree consideration here? 1285 */ 1286 1287 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1288 m_freem(m); 1289 splx(s); 1290 return (0); 1291 } 1292 1293 bridge_enqueue(sc, dst_if, m, 0); 1294 1295 splx(s); 1296 return (0); 1297 } 1298 1299 /* 1300 * bridge_start: 1301 * 1302 * Start output on a bridge. 1303 * 1304 * NOTE: This routine should never be called in this implementation. 1305 */ 1306 static void 1307 bridge_start(struct ifnet *ifp) 1308 { 1309 1310 printf("%s: bridge_start() called\n", ifp->if_xname); 1311 } 1312 1313 /* 1314 * bridge_forward: 1315 * 1316 * The forwarding function of the bridge. 1317 */ 1318 static void 1319 bridge_forward(void *v) 1320 { 1321 struct bridge_softc *sc = v; 1322 struct mbuf *m; 1323 struct bridge_iflist *bif; 1324 struct ifnet *src_if, *dst_if; 1325 struct ether_header *eh; 1326 int s; 1327 1328 mutex_enter(softnet_lock); 1329 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1330 mutex_exit(softnet_lock); 1331 return; 1332 } 1333 1334 s = splnet(); 1335 while (1) { 1336 IFQ_POLL(&sc->sc_if.if_snd, m); 1337 if (m == NULL) 1338 break; 1339 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1340 1341 src_if = m->m_pkthdr.rcvif; 1342 1343 sc->sc_if.if_ipackets++; 1344 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1345 1346 /* 1347 * Look up the bridge_iflist. 1348 */ 1349 bif = bridge_lookup_member_if(sc, src_if); 1350 if (bif == NULL) { 1351 /* Interface is not a bridge member (anymore?) */ 1352 m_freem(m); 1353 continue; 1354 } 1355 1356 if (bif->bif_flags & IFBIF_STP) { 1357 switch (bif->bif_state) { 1358 case BSTP_IFSTATE_BLOCKING: 1359 case BSTP_IFSTATE_LISTENING: 1360 case BSTP_IFSTATE_DISABLED: 1361 m_freem(m); 1362 continue; 1363 } 1364 } 1365 1366 eh = mtod(m, struct ether_header *); 1367 1368 /* 1369 * If the interface is learning, and the source 1370 * address is valid and not multicast, record 1371 * the address. 1372 */ 1373 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1374 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1375 (eh->ether_shost[0] == 0 && 1376 eh->ether_shost[1] == 0 && 1377 eh->ether_shost[2] == 0 && 1378 eh->ether_shost[3] == 0 && 1379 eh->ether_shost[4] == 0 && 1380 eh->ether_shost[5] == 0) == 0) { 1381 (void) bridge_rtupdate(sc, eh->ether_shost, 1382 src_if, 0, IFBAF_DYNAMIC); 1383 } 1384 1385 if ((bif->bif_flags & IFBIF_STP) != 0 && 1386 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1387 m_freem(m); 1388 continue; 1389 } 1390 1391 /* 1392 * At this point, the port either doesn't participate 1393 * in spanning tree or it is in the forwarding state. 1394 */ 1395 1396 /* 1397 * If the packet is unicast, destined for someone on 1398 * "this" side of the bridge, drop it. 1399 */ 1400 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1401 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1402 if (src_if == dst_if) { 1403 m_freem(m); 1404 continue; 1405 } 1406 } else { 1407 /* ...forward it to all interfaces. */ 1408 sc->sc_if.if_imcasts++; 1409 dst_if = NULL; 1410 } 1411 1412 #ifdef PFIL_HOOKS 1413 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1414 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1415 if (m != NULL) 1416 m_freem(m); 1417 continue; 1418 } 1419 if (m == NULL) 1420 continue; 1421 #endif /* PFIL_HOOKS */ 1422 1423 if (dst_if == NULL) { 1424 bridge_broadcast(sc, src_if, m); 1425 continue; 1426 } 1427 1428 /* 1429 * At this point, we're dealing with a unicast frame 1430 * going to a different interface. 1431 */ 1432 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1433 m_freem(m); 1434 continue; 1435 } 1436 bif = bridge_lookup_member_if(sc, dst_if); 1437 if (bif == NULL) { 1438 /* Not a member of the bridge (anymore?) */ 1439 m_freem(m); 1440 continue; 1441 } 1442 1443 if (bif->bif_flags & IFBIF_STP) { 1444 switch (bif->bif_state) { 1445 case BSTP_IFSTATE_DISABLED: 1446 case BSTP_IFSTATE_BLOCKING: 1447 m_freem(m); 1448 continue; 1449 } 1450 } 1451 1452 bridge_enqueue(sc, dst_if, m, 1); 1453 } 1454 splx(s); 1455 mutex_exit(softnet_lock); 1456 } 1457 1458 /* 1459 * bridge_input: 1460 * 1461 * Receive input from a member interface. Queue the packet for 1462 * bridging if it is not for us. 1463 * should be called at splbio() 1464 */ 1465 struct mbuf * 1466 bridge_input(struct ifnet *ifp, struct mbuf *m) 1467 { 1468 struct bridge_softc *sc = ifp->if_bridge; 1469 struct bridge_iflist *bif; 1470 struct ether_header *eh; 1471 struct mbuf *mc; 1472 1473 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1474 return (m); 1475 1476 bif = bridge_lookup_member_if(sc, ifp); 1477 if (bif == NULL) 1478 return (m); 1479 1480 eh = mtod(m, struct ether_header *); 1481 1482 if (m->m_flags & (M_BCAST|M_MCAST)) { 1483 if (bif->bif_flags & IFBIF_STP) { 1484 /* Tap off 802.1D packets; they do not get forwarded. */ 1485 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1486 ETHER_ADDR_LEN) == 0) { 1487 m = bstp_input(sc, bif, m); 1488 if (m == NULL) 1489 return (NULL); 1490 } 1491 1492 switch (bif->bif_state) { 1493 case BSTP_IFSTATE_BLOCKING: 1494 case BSTP_IFSTATE_LISTENING: 1495 case BSTP_IFSTATE_DISABLED: 1496 return (m); 1497 } 1498 } 1499 1500 /* 1501 * Make a deep copy of the packet and enqueue the copy 1502 * for bridge processing; return the original packet for 1503 * local processing. 1504 */ 1505 if (IF_QFULL(&sc->sc_if.if_snd)) { 1506 IF_DROP(&sc->sc_if.if_snd); 1507 return (m); 1508 } 1509 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1510 if (mc == NULL) 1511 return (m); 1512 1513 /* Perform the bridge forwarding function with the copy. */ 1514 IF_ENQUEUE(&sc->sc_if.if_snd, mc); 1515 softint_schedule(sc->sc_softintr); 1516 1517 /* Return the original packet for local processing. */ 1518 return (m); 1519 } 1520 1521 if (bif->bif_flags & IFBIF_STP) { 1522 switch (bif->bif_state) { 1523 case BSTP_IFSTATE_BLOCKING: 1524 case BSTP_IFSTATE_LISTENING: 1525 case BSTP_IFSTATE_DISABLED: 1526 return (m); 1527 } 1528 } 1529 1530 /* 1531 * Unicast. Make sure it's not for us. 1532 */ 1533 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1534 /* It is destined for us. */ 1535 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1536 ETHER_ADDR_LEN) == 0 1537 #if NCARP > 0 1538 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1539 eh, IFT_ETHER, 0) != NULL) 1540 #endif /* NCARP > 0 */ 1541 ) { 1542 if (bif->bif_flags & IFBIF_LEARNING) 1543 (void) bridge_rtupdate(sc, 1544 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1545 m->m_pkthdr.rcvif = bif->bif_ifp; 1546 return (m); 1547 } 1548 1549 /* We just received a packet that we sent out. */ 1550 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1551 ETHER_ADDR_LEN) == 0 1552 #if NCARP > 0 1553 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1554 eh, IFT_ETHER, 1) != NULL) 1555 #endif /* NCARP > 0 */ 1556 ) { 1557 m_freem(m); 1558 return (NULL); 1559 } 1560 } 1561 1562 /* Perform the bridge forwarding function. */ 1563 if (IF_QFULL(&sc->sc_if.if_snd)) { 1564 IF_DROP(&sc->sc_if.if_snd); 1565 m_freem(m); 1566 return (NULL); 1567 } 1568 IF_ENQUEUE(&sc->sc_if.if_snd, m); 1569 softint_schedule(sc->sc_softintr); 1570 1571 return (NULL); 1572 } 1573 1574 /* 1575 * bridge_broadcast: 1576 * 1577 * Send a frame to all interfaces that are members of 1578 * the bridge, except for the one on which the packet 1579 * arrived. 1580 */ 1581 static void 1582 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1583 struct mbuf *m) 1584 { 1585 struct bridge_iflist *bif; 1586 struct mbuf *mc; 1587 struct ifnet *dst_if; 1588 int used = 0; 1589 1590 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1591 dst_if = bif->bif_ifp; 1592 if (dst_if == src_if) 1593 continue; 1594 1595 if (bif->bif_flags & IFBIF_STP) { 1596 switch (bif->bif_state) { 1597 case BSTP_IFSTATE_BLOCKING: 1598 case BSTP_IFSTATE_DISABLED: 1599 continue; 1600 } 1601 } 1602 1603 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1604 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1605 continue; 1606 1607 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1608 continue; 1609 1610 if (LIST_NEXT(bif, bif_next) == NULL) { 1611 mc = m; 1612 used = 1; 1613 } else { 1614 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1615 if (mc == NULL) { 1616 sc->sc_if.if_oerrors++; 1617 continue; 1618 } 1619 } 1620 1621 bridge_enqueue(sc, dst_if, mc, 1); 1622 } 1623 if (used == 0) 1624 m_freem(m); 1625 } 1626 1627 /* 1628 * bridge_rtupdate: 1629 * 1630 * Add a bridge routing entry. 1631 */ 1632 static int 1633 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1634 struct ifnet *dst_if, int setflags, uint8_t flags) 1635 { 1636 struct bridge_rtnode *brt; 1637 int error, s; 1638 1639 /* 1640 * A route for this destination might already exist. If so, 1641 * update it, otherwise create a new one. 1642 */ 1643 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1644 if (sc->sc_brtcnt >= sc->sc_brtmax) 1645 return (ENOSPC); 1646 1647 /* 1648 * Allocate a new bridge forwarding node, and 1649 * initialize the expiration time and Ethernet 1650 * address. 1651 */ 1652 s = splnet(); 1653 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1654 splx(s); 1655 if (brt == NULL) 1656 return (ENOMEM); 1657 1658 memset(brt, 0, sizeof(*brt)); 1659 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1660 brt->brt_flags = IFBAF_DYNAMIC; 1661 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1662 1663 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1664 s = splnet(); 1665 pool_put(&bridge_rtnode_pool, brt); 1666 splx(s); 1667 return (error); 1668 } 1669 } 1670 1671 brt->brt_ifp = dst_if; 1672 if (setflags) { 1673 brt->brt_flags = flags; 1674 if (flags & IFBAF_STATIC) 1675 brt->brt_expire = 0; 1676 else 1677 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1678 } 1679 1680 return (0); 1681 } 1682 1683 /* 1684 * bridge_rtlookup: 1685 * 1686 * Lookup the destination interface for an address. 1687 */ 1688 static struct ifnet * 1689 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1690 { 1691 struct bridge_rtnode *brt; 1692 1693 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1694 return (NULL); 1695 1696 return (brt->brt_ifp); 1697 } 1698 1699 /* 1700 * bridge_rttrim: 1701 * 1702 * Trim the routine table so that we have a number 1703 * of routing entries less than or equal to the 1704 * maximum number. 1705 */ 1706 static void 1707 bridge_rttrim(struct bridge_softc *sc) 1708 { 1709 struct bridge_rtnode *brt, *nbrt; 1710 1711 /* Make sure we actually need to do this. */ 1712 if (sc->sc_brtcnt <= sc->sc_brtmax) 1713 return; 1714 1715 /* Force an aging cycle; this might trim enough addresses. */ 1716 bridge_rtage(sc); 1717 if (sc->sc_brtcnt <= sc->sc_brtmax) 1718 return; 1719 1720 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1721 nbrt = LIST_NEXT(brt, brt_list); 1722 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1723 bridge_rtnode_destroy(sc, brt); 1724 if (sc->sc_brtcnt <= sc->sc_brtmax) 1725 return; 1726 } 1727 } 1728 } 1729 1730 /* 1731 * bridge_timer: 1732 * 1733 * Aging timer for the bridge. 1734 */ 1735 static void 1736 bridge_timer(void *arg) 1737 { 1738 struct bridge_softc *sc = arg; 1739 int s; 1740 1741 s = splnet(); 1742 bridge_rtage(sc); 1743 splx(s); 1744 1745 if (sc->sc_if.if_flags & IFF_RUNNING) 1746 callout_reset(&sc->sc_brcallout, 1747 bridge_rtable_prune_period * hz, bridge_timer, sc); 1748 } 1749 1750 /* 1751 * bridge_rtage: 1752 * 1753 * Perform an aging cycle. 1754 */ 1755 static void 1756 bridge_rtage(struct bridge_softc *sc) 1757 { 1758 struct bridge_rtnode *brt, *nbrt; 1759 1760 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1761 nbrt = LIST_NEXT(brt, brt_list); 1762 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1763 if (time_uptime >= brt->brt_expire) 1764 bridge_rtnode_destroy(sc, brt); 1765 } 1766 } 1767 } 1768 1769 /* 1770 * bridge_rtflush: 1771 * 1772 * Remove all dynamic addresses from the bridge. 1773 */ 1774 static void 1775 bridge_rtflush(struct bridge_softc *sc, int full) 1776 { 1777 struct bridge_rtnode *brt, *nbrt; 1778 1779 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1780 nbrt = LIST_NEXT(brt, brt_list); 1781 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1782 bridge_rtnode_destroy(sc, brt); 1783 } 1784 } 1785 1786 /* 1787 * bridge_rtdaddr: 1788 * 1789 * Remove an address from the table. 1790 */ 1791 static int 1792 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1793 { 1794 struct bridge_rtnode *brt; 1795 1796 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1797 return (ENOENT); 1798 1799 bridge_rtnode_destroy(sc, brt); 1800 return (0); 1801 } 1802 1803 /* 1804 * bridge_rtdelete: 1805 * 1806 * Delete routes to a speicifc member interface. 1807 */ 1808 static void 1809 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1810 { 1811 struct bridge_rtnode *brt, *nbrt; 1812 1813 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1814 nbrt = LIST_NEXT(brt, brt_list); 1815 if (brt->brt_ifp == ifp) 1816 bridge_rtnode_destroy(sc, brt); 1817 } 1818 } 1819 1820 /* 1821 * bridge_rtable_init: 1822 * 1823 * Initialize the route table for this bridge. 1824 */ 1825 static int 1826 bridge_rtable_init(struct bridge_softc *sc) 1827 { 1828 int i; 1829 1830 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1831 M_DEVBUF, M_NOWAIT); 1832 if (sc->sc_rthash == NULL) 1833 return (ENOMEM); 1834 1835 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1836 LIST_INIT(&sc->sc_rthash[i]); 1837 1838 sc->sc_rthash_key = arc4random(); 1839 1840 LIST_INIT(&sc->sc_rtlist); 1841 1842 return (0); 1843 } 1844 1845 /* 1846 * bridge_rtable_fini: 1847 * 1848 * Deconstruct the route table for this bridge. 1849 */ 1850 static void 1851 bridge_rtable_fini(struct bridge_softc *sc) 1852 { 1853 1854 free(sc->sc_rthash, M_DEVBUF); 1855 } 1856 1857 /* 1858 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1859 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1860 */ 1861 #define mix(a, b, c) \ 1862 do { \ 1863 a -= b; a -= c; a ^= (c >> 13); \ 1864 b -= c; b -= a; b ^= (a << 8); \ 1865 c -= a; c -= b; c ^= (b >> 13); \ 1866 a -= b; a -= c; a ^= (c >> 12); \ 1867 b -= c; b -= a; b ^= (a << 16); \ 1868 c -= a; c -= b; c ^= (b >> 5); \ 1869 a -= b; a -= c; a ^= (c >> 3); \ 1870 b -= c; b -= a; b ^= (a << 10); \ 1871 c -= a; c -= b; c ^= (b >> 15); \ 1872 } while (/*CONSTCOND*/0) 1873 1874 static inline uint32_t 1875 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1876 { 1877 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1878 1879 b += addr[5] << 8; 1880 b += addr[4]; 1881 a += addr[3] << 24; 1882 a += addr[2] << 16; 1883 a += addr[1] << 8; 1884 a += addr[0]; 1885 1886 mix(a, b, c); 1887 1888 return (c & BRIDGE_RTHASH_MASK); 1889 } 1890 1891 #undef mix 1892 1893 /* 1894 * bridge_rtnode_lookup: 1895 * 1896 * Look up a bridge route node for the specified destination. 1897 */ 1898 static struct bridge_rtnode * 1899 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1900 { 1901 struct bridge_rtnode *brt; 1902 uint32_t hash; 1903 int dir; 1904 1905 hash = bridge_rthash(sc, addr); 1906 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1907 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1908 if (dir == 0) 1909 return (brt); 1910 if (dir > 0) 1911 return (NULL); 1912 } 1913 1914 return (NULL); 1915 } 1916 1917 /* 1918 * bridge_rtnode_insert: 1919 * 1920 * Insert the specified bridge node into the route table. We 1921 * assume the entry is not already in the table. 1922 */ 1923 static int 1924 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1925 { 1926 struct bridge_rtnode *lbrt; 1927 uint32_t hash; 1928 int dir; 1929 1930 hash = bridge_rthash(sc, brt->brt_addr); 1931 1932 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1933 if (lbrt == NULL) { 1934 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1935 goto out; 1936 } 1937 1938 do { 1939 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1940 if (dir == 0) 1941 return (EEXIST); 1942 if (dir > 0) { 1943 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1944 goto out; 1945 } 1946 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1947 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1948 goto out; 1949 } 1950 lbrt = LIST_NEXT(lbrt, brt_hash); 1951 } while (lbrt != NULL); 1952 1953 #ifdef DIAGNOSTIC 1954 panic("bridge_rtnode_insert: impossible"); 1955 #endif 1956 1957 out: 1958 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1959 sc->sc_brtcnt++; 1960 1961 return (0); 1962 } 1963 1964 /* 1965 * bridge_rtnode_destroy: 1966 * 1967 * Destroy a bridge rtnode. 1968 */ 1969 static void 1970 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1971 { 1972 int s = splnet(); 1973 1974 LIST_REMOVE(brt, brt_hash); 1975 1976 LIST_REMOVE(brt, brt_list); 1977 sc->sc_brtcnt--; 1978 pool_put(&bridge_rtnode_pool, brt); 1979 1980 splx(s); 1981 } 1982 1983 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1984 extern struct pfil_head inet_pfil_hook; /* XXX */ 1985 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1986 1987 /* 1988 * Send bridge packets through IPF if they are one of the types IPF can deal 1989 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1990 * question.) 1991 */ 1992 static int 1993 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1994 { 1995 int snap, error; 1996 struct ether_header *eh1, eh2; 1997 struct llc llc1; 1998 uint16_t ether_type; 1999 2000 snap = 0; 2001 error = -1; /* Default error if not error == 0 */ 2002 eh1 = mtod(*mp, struct ether_header *); 2003 ether_type = ntohs(eh1->ether_type); 2004 2005 /* 2006 * Check for SNAP/LLC. 2007 */ 2008 if (ether_type < ETHERMTU) { 2009 struct llc *llc2 = (struct llc *)(eh1 + 1); 2010 2011 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2012 llc2->llc_dsap == LLC_SNAP_LSAP && 2013 llc2->llc_ssap == LLC_SNAP_LSAP && 2014 llc2->llc_control == LLC_UI) { 2015 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2016 snap = 1; 2017 } 2018 } 2019 2020 /* 2021 * If we're trying to filter bridge traffic, don't look at anything 2022 * other than IP and ARP traffic. If the filter doesn't understand 2023 * IPv6, don't allow IPv6 through the bridge either. This is lame 2024 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2025 * but of course we don't have an AppleTalk filter to begin with. 2026 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2027 * ARP traffic.) 2028 */ 2029 switch (ether_type) { 2030 case ETHERTYPE_ARP: 2031 case ETHERTYPE_REVARP: 2032 return 0; /* Automatically pass */ 2033 case ETHERTYPE_IP: 2034 # ifdef INET6 2035 case ETHERTYPE_IPV6: 2036 # endif /* INET6 */ 2037 break; 2038 default: 2039 goto bad; 2040 } 2041 2042 /* Strip off the Ethernet header and keep a copy. */ 2043 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2044 m_adj(*mp, ETHER_HDR_LEN); 2045 2046 /* Strip off snap header, if present */ 2047 if (snap) { 2048 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2049 m_adj(*mp, sizeof(struct llc)); 2050 } 2051 2052 /* 2053 * Check basic packet sanity and run IPF through pfil. 2054 */ 2055 KASSERT(!cpu_intr_p()); 2056 switch (ether_type) 2057 { 2058 case ETHERTYPE_IP : 2059 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2060 if (error == 0) 2061 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2062 break; 2063 # ifdef INET6 2064 case ETHERTYPE_IPV6 : 2065 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2066 if (error == 0) 2067 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2068 break; 2069 # endif 2070 default : 2071 error = 0; 2072 break; 2073 } 2074 2075 if (*mp == NULL) 2076 return error; 2077 if (error != 0) 2078 goto bad; 2079 2080 error = -1; 2081 2082 /* 2083 * Finally, put everything back the way it was and return 2084 */ 2085 if (snap) { 2086 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2087 if (*mp == NULL) 2088 return error; 2089 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2090 } 2091 2092 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2093 if (*mp == NULL) 2094 return error; 2095 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2096 2097 return 0; 2098 2099 bad: 2100 m_freem(*mp); 2101 *mp = NULL; 2102 return error; 2103 } 2104 2105 /* 2106 * Perform basic checks on header size since 2107 * IPF assumes ip_input has already processed 2108 * it for it. Cut-and-pasted from ip_input.c. 2109 * Given how simple the IPv6 version is, 2110 * does the IPv4 version really need to be 2111 * this complicated? 2112 * 2113 * XXX Should we update ipstat here, or not? 2114 * XXX Right now we update ipstat but not 2115 * XXX csum_counter. 2116 */ 2117 static int 2118 bridge_ip_checkbasic(struct mbuf **mp) 2119 { 2120 struct mbuf *m = *mp; 2121 struct ip *ip; 2122 int len, hlen; 2123 2124 if (*mp == NULL) 2125 return -1; 2126 2127 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2128 if ((m = m_copyup(m, sizeof(struct ip), 2129 (max_linkhdr + 3) & ~3)) == NULL) { 2130 /* XXXJRT new stat, please */ 2131 ip_statinc(IP_STAT_TOOSMALL); 2132 goto bad; 2133 } 2134 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2135 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2136 ip_statinc(IP_STAT_TOOSMALL); 2137 goto bad; 2138 } 2139 } 2140 ip = mtod(m, struct ip *); 2141 if (ip == NULL) goto bad; 2142 2143 if (ip->ip_v != IPVERSION) { 2144 ip_statinc(IP_STAT_BADVERS); 2145 goto bad; 2146 } 2147 hlen = ip->ip_hl << 2; 2148 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2149 ip_statinc(IP_STAT_BADHLEN); 2150 goto bad; 2151 } 2152 if (hlen > m->m_len) { 2153 if ((m = m_pullup(m, hlen)) == 0) { 2154 ip_statinc(IP_STAT_BADHLEN); 2155 goto bad; 2156 } 2157 ip = mtod(m, struct ip *); 2158 if (ip == NULL) goto bad; 2159 } 2160 2161 switch (m->m_pkthdr.csum_flags & 2162 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2163 M_CSUM_IPv4_BAD)) { 2164 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2165 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2166 goto bad; 2167 2168 case M_CSUM_IPv4: 2169 /* Checksum was okay. */ 2170 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2171 break; 2172 2173 default: 2174 /* Must compute it ourselves. */ 2175 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2176 if (in_cksum(m, hlen) != 0) 2177 goto bad; 2178 break; 2179 } 2180 2181 /* Retrieve the packet length. */ 2182 len = ntohs(ip->ip_len); 2183 2184 /* 2185 * Check for additional length bogosity 2186 */ 2187 if (len < hlen) { 2188 ip_statinc(IP_STAT_BADLEN); 2189 goto bad; 2190 } 2191 2192 /* 2193 * Check that the amount of data in the buffers 2194 * is as at least much as the IP header would have us expect. 2195 * Drop packet if shorter than we expect. 2196 */ 2197 if (m->m_pkthdr.len < len) { 2198 ip_statinc(IP_STAT_TOOSHORT); 2199 goto bad; 2200 } 2201 2202 /* Checks out, proceed */ 2203 *mp = m; 2204 return 0; 2205 2206 bad: 2207 *mp = m; 2208 return -1; 2209 } 2210 2211 # ifdef INET6 2212 /* 2213 * Same as above, but for IPv6. 2214 * Cut-and-pasted from ip6_input.c. 2215 * XXX Should we update ip6stat, or not? 2216 */ 2217 static int 2218 bridge_ip6_checkbasic(struct mbuf **mp) 2219 { 2220 struct mbuf *m = *mp; 2221 struct ip6_hdr *ip6; 2222 2223 /* 2224 * If the IPv6 header is not aligned, slurp it up into a new 2225 * mbuf with space for link headers, in the event we forward 2226 * it. Otherwise, if it is aligned, make sure the entire base 2227 * IPv6 header is in the first mbuf of the chain. 2228 */ 2229 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2230 struct ifnet *inifp = m->m_pkthdr.rcvif; 2231 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2232 (max_linkhdr + 3) & ~3)) == NULL) { 2233 /* XXXJRT new stat, please */ 2234 ip6_statinc(IP6_STAT_TOOSMALL); 2235 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2236 goto bad; 2237 } 2238 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2239 struct ifnet *inifp = m->m_pkthdr.rcvif; 2240 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2241 ip6_statinc(IP6_STAT_TOOSMALL); 2242 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2243 goto bad; 2244 } 2245 } 2246 2247 ip6 = mtod(m, struct ip6_hdr *); 2248 2249 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2250 ip6_statinc(IP6_STAT_BADVERS); 2251 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2252 goto bad; 2253 } 2254 2255 /* Checks out, proceed */ 2256 *mp = m; 2257 return 0; 2258 2259 bad: 2260 *mp = m; 2261 return -1; 2262 } 2263 # endif /* INET6 */ 2264 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2265
Indexes created Mon Sep 22 21:09:42 GMT 2025