if_bridge.c revision 1.62.6.2
1 /* $NetBSD: if_bridge.c,v 1.62.6.2 2009/04/04 18:01:25 snj 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 1.62.6.2 2009/04/04 18:01:25 snj 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 ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 503 /* 504 * If interface is marked down and it is running, 505 * then stop and disable it. 506 */ 507 (*ifp->if_stop)(ifp, 1); 508 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 509 /* 510 * If interface is marked up and it is stopped, then 511 * start it. 512 */ 513 error = (*ifp->if_init)(ifp); 514 } 515 break; 516 517 default: 518 error = ENOTTY; 519 break; 520 } 521 522 splx(s); 523 524 return (error); 525 } 526 527 /* 528 * bridge_lookup_member: 529 * 530 * Lookup a bridge member interface. Must be called at splnet(). 531 */ 532 static struct bridge_iflist * 533 bridge_lookup_member(struct bridge_softc *sc, const char *name) 534 { 535 struct bridge_iflist *bif; 536 struct ifnet *ifp; 537 538 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 539 ifp = bif->bif_ifp; 540 if (strcmp(ifp->if_xname, name) == 0) 541 return (bif); 542 } 543 544 return (NULL); 545 } 546 547 /* 548 * bridge_lookup_member_if: 549 * 550 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 551 */ 552 static struct bridge_iflist * 553 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 554 { 555 struct bridge_iflist *bif; 556 557 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 558 if (bif->bif_ifp == member_ifp) 559 return (bif); 560 } 561 562 return (NULL); 563 } 564 565 /* 566 * bridge_delete_member: 567 * 568 * Delete the specified member interface. 569 */ 570 static void 571 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 572 { 573 struct ifnet *ifs = bif->bif_ifp; 574 575 switch (ifs->if_type) { 576 case IFT_ETHER: 577 /* 578 * Take the interface out of promiscuous mode. 579 */ 580 (void) ifpromisc(ifs, 0); 581 break; 582 default: 583 #ifdef DIAGNOSTIC 584 panic("bridge_delete_member: impossible"); 585 #endif 586 break; 587 } 588 589 ifs->if_bridge = NULL; 590 LIST_REMOVE(bif, bif_next); 591 592 bridge_rtdelete(sc, ifs); 593 594 free(bif, M_DEVBUF); 595 596 if (sc->sc_if.if_flags & IFF_RUNNING) 597 bstp_initialization(sc); 598 } 599 600 static int 601 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 602 { 603 struct ifbreq *req = arg; 604 struct bridge_iflist *bif = NULL; 605 struct ifnet *ifs; 606 int error = 0; 607 608 ifs = ifunit(req->ifbr_ifsname); 609 if (ifs == NULL) 610 return (ENOENT); 611 612 if (sc->sc_if.if_mtu != ifs->if_mtu) 613 return (EINVAL); 614 615 if (ifs->if_bridge == sc) 616 return (EEXIST); 617 618 if (ifs->if_bridge != NULL) 619 return (EBUSY); 620 621 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 622 if (bif == NULL) 623 return (ENOMEM); 624 625 switch (ifs->if_type) { 626 case IFT_ETHER: 627 /* 628 * Place the interface into promiscuous mode. 629 */ 630 error = ifpromisc(ifs, 1); 631 if (error) 632 goto out; 633 break; 634 default: 635 error = EINVAL; 636 goto out; 637 } 638 639 bif->bif_ifp = ifs; 640 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 641 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 642 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 643 644 ifs->if_bridge = sc; 645 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 646 647 if (sc->sc_if.if_flags & IFF_RUNNING) 648 bstp_initialization(sc); 649 else 650 bstp_stop(sc); 651 652 out: 653 if (error) { 654 if (bif != NULL) 655 free(bif, M_DEVBUF); 656 } 657 return (error); 658 } 659 660 static int 661 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 662 { 663 struct ifbreq *req = arg; 664 struct bridge_iflist *bif; 665 666 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 667 if (bif == NULL) 668 return (ENOENT); 669 670 bridge_delete_member(sc, bif); 671 672 return (0); 673 } 674 675 static int 676 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 677 { 678 struct ifbreq *req = arg; 679 struct bridge_iflist *bif; 680 681 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 682 if (bif == NULL) 683 return (ENOENT); 684 685 req->ifbr_ifsflags = bif->bif_flags; 686 req->ifbr_state = bif->bif_state; 687 req->ifbr_priority = bif->bif_priority; 688 req->ifbr_path_cost = bif->bif_path_cost; 689 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 690 691 return (0); 692 } 693 694 static int 695 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 696 { 697 struct ifbreq *req = arg; 698 struct bridge_iflist *bif; 699 700 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 701 if (bif == NULL) 702 return (ENOENT); 703 704 if (req->ifbr_ifsflags & IFBIF_STP) { 705 switch (bif->bif_ifp->if_type) { 706 case IFT_ETHER: 707 /* These can do spanning tree. */ 708 break; 709 710 default: 711 /* Nothing else can. */ 712 return (EINVAL); 713 } 714 } 715 716 bif->bif_flags = req->ifbr_ifsflags; 717 718 if (sc->sc_if.if_flags & IFF_RUNNING) 719 bstp_initialization(sc); 720 721 return (0); 722 } 723 724 static int 725 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 726 { 727 struct ifbrparam *param = arg; 728 729 sc->sc_brtmax = param->ifbrp_csize; 730 bridge_rttrim(sc); 731 732 return (0); 733 } 734 735 static int 736 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 737 { 738 struct ifbrparam *param = arg; 739 740 param->ifbrp_csize = sc->sc_brtmax; 741 742 return (0); 743 } 744 745 static int 746 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 747 { 748 struct ifbifconf *bifc = arg; 749 struct bridge_iflist *bif; 750 struct ifbreq breq; 751 int count, len, error = 0; 752 753 count = 0; 754 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 755 count++; 756 757 if (bifc->ifbic_len == 0) { 758 bifc->ifbic_len = sizeof(breq) * count; 759 return (0); 760 } 761 762 count = 0; 763 len = bifc->ifbic_len; 764 memset(&breq, 0, sizeof breq); 765 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 766 if (len < sizeof(breq)) 767 break; 768 769 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 770 sizeof(breq.ifbr_ifsname)); 771 breq.ifbr_ifsflags = bif->bif_flags; 772 breq.ifbr_state = bif->bif_state; 773 breq.ifbr_priority = bif->bif_priority; 774 breq.ifbr_path_cost = bif->bif_path_cost; 775 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 776 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 777 if (error) 778 break; 779 count++; 780 len -= sizeof(breq); 781 } 782 783 bifc->ifbic_len = sizeof(breq) * count; 784 return (error); 785 } 786 787 static int 788 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 789 { 790 struct ifbaconf *bac = arg; 791 struct bridge_rtnode *brt; 792 struct ifbareq bareq; 793 int count = 0, error = 0, len; 794 795 if (bac->ifbac_len == 0) 796 return (0); 797 798 len = bac->ifbac_len; 799 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 800 if (len < sizeof(bareq)) 801 goto out; 802 memset(&bareq, 0, sizeof(bareq)); 803 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 804 sizeof(bareq.ifba_ifsname)); 805 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 806 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 807 bareq.ifba_expire = brt->brt_expire - time_uptime; 808 } else 809 bareq.ifba_expire = 0; 810 bareq.ifba_flags = brt->brt_flags; 811 812 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 813 if (error) 814 goto out; 815 count++; 816 len -= sizeof(bareq); 817 } 818 out: 819 bac->ifbac_len = sizeof(bareq) * count; 820 return (error); 821 } 822 823 static int 824 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 825 { 826 struct ifbareq *req = arg; 827 struct bridge_iflist *bif; 828 int error; 829 830 bif = bridge_lookup_member(sc, req->ifba_ifsname); 831 if (bif == NULL) 832 return (ENOENT); 833 834 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 835 req->ifba_flags); 836 837 return (error); 838 } 839 840 static int 841 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 842 { 843 struct ifbrparam *param = arg; 844 845 sc->sc_brttimeout = param->ifbrp_ctime; 846 847 return (0); 848 } 849 850 static int 851 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 852 { 853 struct ifbrparam *param = arg; 854 855 param->ifbrp_ctime = sc->sc_brttimeout; 856 857 return (0); 858 } 859 860 static int 861 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 862 { 863 struct ifbareq *req = arg; 864 865 return (bridge_rtdaddr(sc, req->ifba_dst)); 866 } 867 868 static int 869 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 870 { 871 struct ifbreq *req = arg; 872 873 bridge_rtflush(sc, req->ifbr_ifsflags); 874 875 return (0); 876 } 877 878 static int 879 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 880 { 881 struct ifbrparam *param = arg; 882 883 param->ifbrp_prio = sc->sc_bridge_priority; 884 885 return (0); 886 } 887 888 static int 889 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 890 { 891 struct ifbrparam *param = arg; 892 893 sc->sc_bridge_priority = param->ifbrp_prio; 894 895 if (sc->sc_if.if_flags & IFF_RUNNING) 896 bstp_initialization(sc); 897 898 return (0); 899 } 900 901 static int 902 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 903 { 904 struct ifbrparam *param = arg; 905 906 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 907 908 return (0); 909 } 910 911 static int 912 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 913 { 914 struct ifbrparam *param = arg; 915 916 if (param->ifbrp_hellotime == 0) 917 return (EINVAL); 918 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 919 920 if (sc->sc_if.if_flags & IFF_RUNNING) 921 bstp_initialization(sc); 922 923 return (0); 924 } 925 926 static int 927 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 928 { 929 struct ifbrparam *param = arg; 930 931 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 932 933 return (0); 934 } 935 936 static int 937 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 938 { 939 struct ifbrparam *param = arg; 940 941 if (param->ifbrp_fwddelay == 0) 942 return (EINVAL); 943 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 944 945 if (sc->sc_if.if_flags & IFF_RUNNING) 946 bstp_initialization(sc); 947 948 return (0); 949 } 950 951 static int 952 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 953 { 954 struct ifbrparam *param = arg; 955 956 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 957 958 return (0); 959 } 960 961 static int 962 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 963 { 964 struct ifbrparam *param = arg; 965 966 if (param->ifbrp_maxage == 0) 967 return (EINVAL); 968 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 969 970 if (sc->sc_if.if_flags & IFF_RUNNING) 971 bstp_initialization(sc); 972 973 return (0); 974 } 975 976 static int 977 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 978 { 979 struct ifbreq *req = arg; 980 struct bridge_iflist *bif; 981 982 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 983 if (bif == NULL) 984 return (ENOENT); 985 986 bif->bif_priority = req->ifbr_priority; 987 988 if (sc->sc_if.if_flags & IFF_RUNNING) 989 bstp_initialization(sc); 990 991 return (0); 992 } 993 994 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 995 static int 996 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 997 { 998 struct ifbrparam *param = arg; 999 1000 param->ifbrp_filter = sc->sc_filter_flags; 1001 1002 return (0); 1003 } 1004 1005 static int 1006 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1007 { 1008 struct ifbrparam *param = arg; 1009 uint32_t nflags, oflags; 1010 1011 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1012 return (EINVAL); 1013 1014 nflags = param->ifbrp_filter; 1015 oflags = sc->sc_filter_flags; 1016 1017 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1018 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1019 &sc->sc_if.if_pfil); 1020 } 1021 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1022 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1023 &sc->sc_if.if_pfil); 1024 } 1025 1026 sc->sc_filter_flags = nflags; 1027 1028 return (0); 1029 } 1030 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1031 1032 static int 1033 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1034 { 1035 struct ifbreq *req = arg; 1036 struct bridge_iflist *bif; 1037 1038 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1039 if (bif == NULL) 1040 return (ENOENT); 1041 1042 bif->bif_path_cost = req->ifbr_path_cost; 1043 1044 if (sc->sc_if.if_flags & IFF_RUNNING) 1045 bstp_initialization(sc); 1046 1047 return (0); 1048 } 1049 1050 /* 1051 * bridge_ifdetach: 1052 * 1053 * Detach an interface from a bridge. Called when a member 1054 * interface is detaching. 1055 */ 1056 void 1057 bridge_ifdetach(struct ifnet *ifp) 1058 { 1059 struct bridge_softc *sc = ifp->if_bridge; 1060 struct ifbreq breq; 1061 1062 memset(&breq, 0, sizeof(breq)); 1063 snprintf(breq.ifbr_ifsname, sizeof(breq.ifbr_ifsname), ifp->if_xname); 1064 1065 (void) bridge_ioctl_del(sc, &breq); 1066 } 1067 1068 /* 1069 * bridge_init: 1070 * 1071 * Initialize a bridge interface. 1072 */ 1073 static int 1074 bridge_init(struct ifnet *ifp) 1075 { 1076 struct bridge_softc *sc = ifp->if_softc; 1077 1078 if (ifp->if_flags & IFF_RUNNING) 1079 return (0); 1080 1081 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1082 bridge_timer, sc); 1083 1084 ifp->if_flags |= IFF_RUNNING; 1085 bstp_initialization(sc); 1086 return (0); 1087 } 1088 1089 /* 1090 * bridge_stop: 1091 * 1092 * Stop the bridge interface. 1093 */ 1094 static void 1095 bridge_stop(struct ifnet *ifp, int disable) 1096 { 1097 struct bridge_softc *sc = ifp->if_softc; 1098 1099 if ((ifp->if_flags & IFF_RUNNING) == 0) 1100 return; 1101 1102 callout_stop(&sc->sc_brcallout); 1103 bstp_stop(sc); 1104 1105 IF_PURGE(&ifp->if_snd); 1106 1107 bridge_rtflush(sc, IFBF_FLUSHDYN); 1108 1109 ifp->if_flags &= ~IFF_RUNNING; 1110 } 1111 1112 /* 1113 * bridge_enqueue: 1114 * 1115 * Enqueue a packet on a bridge member interface. 1116 * 1117 * NOTE: must be called at splnet(). 1118 */ 1119 void 1120 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1121 int runfilt) 1122 { 1123 ALTQ_DECL(struct altq_pktattr pktattr;) 1124 int len, error; 1125 short mflags; 1126 1127 /* 1128 * Clear any in-bound checksum flags for this packet. 1129 */ 1130 m->m_pkthdr.csum_flags = 0; 1131 1132 #ifdef PFIL_HOOKS 1133 if (runfilt) { 1134 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1135 dst_ifp, PFIL_OUT) != 0) { 1136 if (m != NULL) 1137 m_freem(m); 1138 return; 1139 } 1140 if (m == NULL) 1141 return; 1142 } 1143 #endif /* PFIL_HOOKS */ 1144 1145 #ifdef ALTQ 1146 /* 1147 * If ALTQ is enabled on the member interface, do 1148 * classification; the queueing discipline might 1149 * not require classification, but might require 1150 * the address family/header pointer in the pktattr. 1151 */ 1152 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1153 /* XXX IFT_ETHER */ 1154 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1155 } 1156 #endif /* ALTQ */ 1157 1158 len = m->m_pkthdr.len; 1159 m->m_flags |= M_PROTO1; 1160 mflags = m->m_flags; 1161 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1162 if (error) { 1163 /* mbuf is already freed */ 1164 sc->sc_if.if_oerrors++; 1165 return; 1166 } 1167 1168 sc->sc_if.if_opackets++; 1169 sc->sc_if.if_obytes += len; 1170 1171 dst_ifp->if_obytes += len; 1172 1173 if (mflags & M_MCAST) { 1174 sc->sc_if.if_omcasts++; 1175 dst_ifp->if_omcasts++; 1176 } 1177 1178 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1179 (*dst_ifp->if_start)(dst_ifp); 1180 } 1181 1182 /* 1183 * bridge_output: 1184 * 1185 * Send output from a bridge member interface. This 1186 * performs the bridging function for locally originated 1187 * packets. 1188 * 1189 * The mbuf has the Ethernet header already attached. We must 1190 * enqueue or free the mbuf before returning. 1191 */ 1192 int 1193 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1194 struct rtentry *rt) 1195 { 1196 struct ether_header *eh; 1197 struct ifnet *dst_if; 1198 struct bridge_softc *sc; 1199 int s; 1200 1201 if (m->m_len < ETHER_HDR_LEN) { 1202 m = m_pullup(m, ETHER_HDR_LEN); 1203 if (m == NULL) 1204 return (0); 1205 } 1206 1207 eh = mtod(m, struct ether_header *); 1208 sc = ifp->if_bridge; 1209 1210 s = splnet(); 1211 1212 /* 1213 * If bridge is down, but the original output interface is up, 1214 * go ahead and send out that interface. Otherwise, the packet 1215 * is dropped below. 1216 */ 1217 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1218 dst_if = ifp; 1219 goto sendunicast; 1220 } 1221 1222 /* 1223 * If the packet is a multicast, or we don't know a better way to 1224 * get there, send to all interfaces. 1225 */ 1226 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1227 dst_if = NULL; 1228 else 1229 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1230 if (dst_if == NULL) { 1231 struct bridge_iflist *bif; 1232 struct mbuf *mc; 1233 int used = 0; 1234 1235 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1236 dst_if = bif->bif_ifp; 1237 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1238 continue; 1239 1240 /* 1241 * If this is not the original output interface, 1242 * and the interface is participating in spanning 1243 * tree, make sure the port is in a state that 1244 * allows forwarding. 1245 */ 1246 if (dst_if != ifp && 1247 (bif->bif_flags & IFBIF_STP) != 0) { 1248 switch (bif->bif_state) { 1249 case BSTP_IFSTATE_BLOCKING: 1250 case BSTP_IFSTATE_LISTENING: 1251 case BSTP_IFSTATE_DISABLED: 1252 continue; 1253 } 1254 } 1255 1256 if (LIST_NEXT(bif, bif_next) == NULL) { 1257 used = 1; 1258 mc = m; 1259 } else { 1260 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1261 if (mc == NULL) { 1262 sc->sc_if.if_oerrors++; 1263 continue; 1264 } 1265 } 1266 1267 bridge_enqueue(sc, dst_if, mc, 0); 1268 } 1269 if (used == 0) 1270 m_freem(m); 1271 splx(s); 1272 return (0); 1273 } 1274 1275 sendunicast: 1276 /* 1277 * XXX Spanning tree consideration here? 1278 */ 1279 1280 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1281 m_freem(m); 1282 splx(s); 1283 return (0); 1284 } 1285 1286 bridge_enqueue(sc, dst_if, m, 0); 1287 1288 splx(s); 1289 return (0); 1290 } 1291 1292 /* 1293 * bridge_start: 1294 * 1295 * Start output on a bridge. 1296 * 1297 * NOTE: This routine should never be called in this implementation. 1298 */ 1299 static void 1300 bridge_start(struct ifnet *ifp) 1301 { 1302 1303 printf("%s: bridge_start() called\n", ifp->if_xname); 1304 } 1305 1306 /* 1307 * bridge_forward: 1308 * 1309 * The forwarding function of the bridge. 1310 */ 1311 static void 1312 bridge_forward(void *v) 1313 { 1314 struct bridge_softc *sc = v; 1315 struct mbuf *m; 1316 struct bridge_iflist *bif; 1317 struct ifnet *src_if, *dst_if; 1318 struct ether_header *eh; 1319 int s; 1320 1321 mutex_enter(softnet_lock); 1322 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1323 mutex_exit(softnet_lock); 1324 return; 1325 } 1326 1327 s = splnet(); 1328 while (1) { 1329 IFQ_POLL(&sc->sc_if.if_snd, m); 1330 if (m == NULL) 1331 break; 1332 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1333 1334 src_if = m->m_pkthdr.rcvif; 1335 1336 sc->sc_if.if_ipackets++; 1337 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1338 1339 /* 1340 * Look up the bridge_iflist. 1341 */ 1342 bif = bridge_lookup_member_if(sc, src_if); 1343 if (bif == NULL) { 1344 /* Interface is not a bridge member (anymore?) */ 1345 m_freem(m); 1346 continue; 1347 } 1348 1349 if (bif->bif_flags & IFBIF_STP) { 1350 switch (bif->bif_state) { 1351 case BSTP_IFSTATE_BLOCKING: 1352 case BSTP_IFSTATE_LISTENING: 1353 case BSTP_IFSTATE_DISABLED: 1354 m_freem(m); 1355 continue; 1356 } 1357 } 1358 1359 eh = mtod(m, struct ether_header *); 1360 1361 /* 1362 * If the interface is learning, and the source 1363 * address is valid and not multicast, record 1364 * the address. 1365 */ 1366 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1367 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1368 (eh->ether_shost[0] == 0 && 1369 eh->ether_shost[1] == 0 && 1370 eh->ether_shost[2] == 0 && 1371 eh->ether_shost[3] == 0 && 1372 eh->ether_shost[4] == 0 && 1373 eh->ether_shost[5] == 0) == 0) { 1374 (void) bridge_rtupdate(sc, eh->ether_shost, 1375 src_if, 0, IFBAF_DYNAMIC); 1376 } 1377 1378 if ((bif->bif_flags & IFBIF_STP) != 0 && 1379 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1380 m_freem(m); 1381 continue; 1382 } 1383 1384 /* 1385 * At this point, the port either doesn't participate 1386 * in spanning tree or it is in the forwarding state. 1387 */ 1388 1389 /* 1390 * If the packet is unicast, destined for someone on 1391 * "this" side of the bridge, drop it. 1392 */ 1393 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1394 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1395 if (src_if == dst_if) { 1396 m_freem(m); 1397 continue; 1398 } 1399 } else { 1400 /* ...forward it to all interfaces. */ 1401 sc->sc_if.if_imcasts++; 1402 dst_if = NULL; 1403 } 1404 1405 #ifdef PFIL_HOOKS 1406 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1407 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1408 if (m != NULL) 1409 m_freem(m); 1410 continue; 1411 } 1412 if (m == NULL) 1413 continue; 1414 #endif /* PFIL_HOOKS */ 1415 1416 if (dst_if == NULL) { 1417 bridge_broadcast(sc, src_if, m); 1418 continue; 1419 } 1420 1421 /* 1422 * At this point, we're dealing with a unicast frame 1423 * going to a different interface. 1424 */ 1425 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1426 m_freem(m); 1427 continue; 1428 } 1429 bif = bridge_lookup_member_if(sc, dst_if); 1430 if (bif == NULL) { 1431 /* Not a member of the bridge (anymore?) */ 1432 m_freem(m); 1433 continue; 1434 } 1435 1436 if (bif->bif_flags & IFBIF_STP) { 1437 switch (bif->bif_state) { 1438 case BSTP_IFSTATE_DISABLED: 1439 case BSTP_IFSTATE_BLOCKING: 1440 m_freem(m); 1441 continue; 1442 } 1443 } 1444 1445 bridge_enqueue(sc, dst_if, m, 1); 1446 } 1447 splx(s); 1448 mutex_exit(softnet_lock); 1449 } 1450 1451 /* 1452 * bridge_input: 1453 * 1454 * Receive input from a member interface. Queue the packet for 1455 * bridging if it is not for us. 1456 * should be called at splbio() 1457 */ 1458 struct mbuf * 1459 bridge_input(struct ifnet *ifp, struct mbuf *m) 1460 { 1461 struct bridge_softc *sc = ifp->if_bridge; 1462 struct bridge_iflist *bif; 1463 struct ether_header *eh; 1464 struct mbuf *mc; 1465 1466 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1467 return (m); 1468 1469 bif = bridge_lookup_member_if(sc, ifp); 1470 if (bif == NULL) 1471 return (m); 1472 1473 eh = mtod(m, struct ether_header *); 1474 1475 if (m->m_flags & (M_BCAST|M_MCAST)) { 1476 /* Tap off 802.1D packets; they do not get forwarded. */ 1477 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1478 ETHER_ADDR_LEN) == 0) { 1479 m = bstp_input(ifp, m); 1480 if (m == NULL) 1481 return (NULL); 1482 } 1483 1484 if (bif->bif_flags & IFBIF_STP) { 1485 switch (bif->bif_state) { 1486 case BSTP_IFSTATE_BLOCKING: 1487 case BSTP_IFSTATE_LISTENING: 1488 case BSTP_IFSTATE_DISABLED: 1489 return (m); 1490 } 1491 } 1492 1493 /* 1494 * Make a deep copy of the packet and enqueue the copy 1495 * for bridge processing; return the original packet for 1496 * local processing. 1497 */ 1498 if (IF_QFULL(&sc->sc_if.if_snd)) { 1499 IF_DROP(&sc->sc_if.if_snd); 1500 return (m); 1501 } 1502 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1503 if (mc == NULL) 1504 return (m); 1505 1506 /* Perform the bridge forwarding function with the copy. */ 1507 IF_ENQUEUE(&sc->sc_if.if_snd, mc); 1508 softint_schedule(sc->sc_softintr); 1509 1510 /* Return the original packet for local processing. */ 1511 return (m); 1512 } 1513 1514 if (bif->bif_flags & IFBIF_STP) { 1515 switch (bif->bif_state) { 1516 case BSTP_IFSTATE_BLOCKING: 1517 case BSTP_IFSTATE_LISTENING: 1518 case BSTP_IFSTATE_DISABLED: 1519 return (m); 1520 } 1521 } 1522 1523 /* 1524 * Unicast. Make sure it's not for us. 1525 */ 1526 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1527 /* It is destined for us. */ 1528 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1529 ETHER_ADDR_LEN) == 0 1530 #if NCARP > 0 1531 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1532 eh, IFT_ETHER, 0) != NULL) 1533 #endif /* NCARP > 0 */ 1534 ) { 1535 if (bif->bif_flags & IFBIF_LEARNING) 1536 (void) bridge_rtupdate(sc, 1537 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1538 m->m_pkthdr.rcvif = bif->bif_ifp; 1539 return (m); 1540 } 1541 1542 /* We just received a packet that we sent out. */ 1543 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1544 ETHER_ADDR_LEN) == 0 1545 #if NCARP > 0 1546 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1547 eh, IFT_ETHER, 1) != NULL) 1548 #endif /* NCARP > 0 */ 1549 ) { 1550 m_freem(m); 1551 return (NULL); 1552 } 1553 } 1554 1555 /* Perform the bridge forwarding function. */ 1556 if (IF_QFULL(&sc->sc_if.if_snd)) { 1557 IF_DROP(&sc->sc_if.if_snd); 1558 m_freem(m); 1559 return (NULL); 1560 } 1561 IF_ENQUEUE(&sc->sc_if.if_snd, m); 1562 softint_schedule(sc->sc_softintr); 1563 1564 return (NULL); 1565 } 1566 1567 /* 1568 * bridge_broadcast: 1569 * 1570 * Send a frame to all interfaces that are members of 1571 * the bridge, except for the one on which the packet 1572 * arrived. 1573 */ 1574 static void 1575 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1576 struct mbuf *m) 1577 { 1578 struct bridge_iflist *bif; 1579 struct mbuf *mc; 1580 struct ifnet *dst_if; 1581 int used = 0; 1582 1583 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1584 dst_if = bif->bif_ifp; 1585 if (dst_if == src_if) 1586 continue; 1587 1588 if (bif->bif_flags & IFBIF_STP) { 1589 switch (bif->bif_state) { 1590 case BSTP_IFSTATE_BLOCKING: 1591 case BSTP_IFSTATE_DISABLED: 1592 continue; 1593 } 1594 } 1595 1596 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1597 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1598 continue; 1599 1600 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1601 continue; 1602 1603 if (LIST_NEXT(bif, bif_next) == NULL) { 1604 mc = m; 1605 used = 1; 1606 } else { 1607 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1608 if (mc == NULL) { 1609 sc->sc_if.if_oerrors++; 1610 continue; 1611 } 1612 } 1613 1614 bridge_enqueue(sc, dst_if, mc, 1); 1615 } 1616 if (used == 0) 1617 m_freem(m); 1618 } 1619 1620 /* 1621 * bridge_rtupdate: 1622 * 1623 * Add a bridge routing entry. 1624 */ 1625 static int 1626 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1627 struct ifnet *dst_if, int setflags, uint8_t flags) 1628 { 1629 struct bridge_rtnode *brt; 1630 int error, s; 1631 1632 /* 1633 * A route for this destination might already exist. If so, 1634 * update it, otherwise create a new one. 1635 */ 1636 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1637 if (sc->sc_brtcnt >= sc->sc_brtmax) 1638 return (ENOSPC); 1639 1640 /* 1641 * Allocate a new bridge forwarding node, and 1642 * initialize the expiration time and Ethernet 1643 * address. 1644 */ 1645 s = splnet(); 1646 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1647 splx(s); 1648 if (brt == NULL) 1649 return (ENOMEM); 1650 1651 memset(brt, 0, sizeof(*brt)); 1652 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1653 brt->brt_flags = IFBAF_DYNAMIC; 1654 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1655 1656 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1657 s = splnet(); 1658 pool_put(&bridge_rtnode_pool, brt); 1659 splx(s); 1660 return (error); 1661 } 1662 } 1663 1664 brt->brt_ifp = dst_if; 1665 if (setflags) { 1666 brt->brt_flags = flags; 1667 if (flags & IFBAF_STATIC) 1668 brt->brt_expire = 0; 1669 else 1670 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1671 } 1672 1673 return (0); 1674 } 1675 1676 /* 1677 * bridge_rtlookup: 1678 * 1679 * Lookup the destination interface for an address. 1680 */ 1681 static struct ifnet * 1682 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1683 { 1684 struct bridge_rtnode *brt; 1685 1686 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1687 return (NULL); 1688 1689 return (brt->brt_ifp); 1690 } 1691 1692 /* 1693 * bridge_rttrim: 1694 * 1695 * Trim the routine table so that we have a number 1696 * of routing entries less than or equal to the 1697 * maximum number. 1698 */ 1699 static void 1700 bridge_rttrim(struct bridge_softc *sc) 1701 { 1702 struct bridge_rtnode *brt, *nbrt; 1703 1704 /* Make sure we actually need to do this. */ 1705 if (sc->sc_brtcnt <= sc->sc_brtmax) 1706 return; 1707 1708 /* Force an aging cycle; this might trim enough addresses. */ 1709 bridge_rtage(sc); 1710 if (sc->sc_brtcnt <= sc->sc_brtmax) 1711 return; 1712 1713 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1714 nbrt = LIST_NEXT(brt, brt_list); 1715 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1716 bridge_rtnode_destroy(sc, brt); 1717 if (sc->sc_brtcnt <= sc->sc_brtmax) 1718 return; 1719 } 1720 } 1721 } 1722 1723 /* 1724 * bridge_timer: 1725 * 1726 * Aging timer for the bridge. 1727 */ 1728 static void 1729 bridge_timer(void *arg) 1730 { 1731 struct bridge_softc *sc = arg; 1732 int s; 1733 1734 s = splnet(); 1735 bridge_rtage(sc); 1736 splx(s); 1737 1738 if (sc->sc_if.if_flags & IFF_RUNNING) 1739 callout_reset(&sc->sc_brcallout, 1740 bridge_rtable_prune_period * hz, bridge_timer, sc); 1741 } 1742 1743 /* 1744 * bridge_rtage: 1745 * 1746 * Perform an aging cycle. 1747 */ 1748 static void 1749 bridge_rtage(struct bridge_softc *sc) 1750 { 1751 struct bridge_rtnode *brt, *nbrt; 1752 1753 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1754 nbrt = LIST_NEXT(brt, brt_list); 1755 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1756 if (time_uptime >= brt->brt_expire) 1757 bridge_rtnode_destroy(sc, brt); 1758 } 1759 } 1760 } 1761 1762 /* 1763 * bridge_rtflush: 1764 * 1765 * Remove all dynamic addresses from the bridge. 1766 */ 1767 static void 1768 bridge_rtflush(struct bridge_softc *sc, int full) 1769 { 1770 struct bridge_rtnode *brt, *nbrt; 1771 1772 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1773 nbrt = LIST_NEXT(brt, brt_list); 1774 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1775 bridge_rtnode_destroy(sc, brt); 1776 } 1777 } 1778 1779 /* 1780 * bridge_rtdaddr: 1781 * 1782 * Remove an address from the table. 1783 */ 1784 static int 1785 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1786 { 1787 struct bridge_rtnode *brt; 1788 1789 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1790 return (ENOENT); 1791 1792 bridge_rtnode_destroy(sc, brt); 1793 return (0); 1794 } 1795 1796 /* 1797 * bridge_rtdelete: 1798 * 1799 * Delete routes to a speicifc member interface. 1800 */ 1801 static void 1802 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1803 { 1804 struct bridge_rtnode *brt, *nbrt; 1805 1806 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1807 nbrt = LIST_NEXT(brt, brt_list); 1808 if (brt->brt_ifp == ifp) 1809 bridge_rtnode_destroy(sc, brt); 1810 } 1811 } 1812 1813 /* 1814 * bridge_rtable_init: 1815 * 1816 * Initialize the route table for this bridge. 1817 */ 1818 static int 1819 bridge_rtable_init(struct bridge_softc *sc) 1820 { 1821 int i; 1822 1823 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1824 M_DEVBUF, M_NOWAIT); 1825 if (sc->sc_rthash == NULL) 1826 return (ENOMEM); 1827 1828 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1829 LIST_INIT(&sc->sc_rthash[i]); 1830 1831 sc->sc_rthash_key = arc4random(); 1832 1833 LIST_INIT(&sc->sc_rtlist); 1834 1835 return (0); 1836 } 1837 1838 /* 1839 * bridge_rtable_fini: 1840 * 1841 * Deconstruct the route table for this bridge. 1842 */ 1843 static void 1844 bridge_rtable_fini(struct bridge_softc *sc) 1845 { 1846 1847 free(sc->sc_rthash, M_DEVBUF); 1848 } 1849 1850 /* 1851 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1852 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1853 */ 1854 #define mix(a, b, c) \ 1855 do { \ 1856 a -= b; a -= c; a ^= (c >> 13); \ 1857 b -= c; b -= a; b ^= (a << 8); \ 1858 c -= a; c -= b; c ^= (b >> 13); \ 1859 a -= b; a -= c; a ^= (c >> 12); \ 1860 b -= c; b -= a; b ^= (a << 16); \ 1861 c -= a; c -= b; c ^= (b >> 5); \ 1862 a -= b; a -= c; a ^= (c >> 3); \ 1863 b -= c; b -= a; b ^= (a << 10); \ 1864 c -= a; c -= b; c ^= (b >> 15); \ 1865 } while (/*CONSTCOND*/0) 1866 1867 static inline uint32_t 1868 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1869 { 1870 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1871 1872 b += addr[5] << 8; 1873 b += addr[4]; 1874 a += addr[3] << 24; 1875 a += addr[2] << 16; 1876 a += addr[1] << 8; 1877 a += addr[0]; 1878 1879 mix(a, b, c); 1880 1881 return (c & BRIDGE_RTHASH_MASK); 1882 } 1883 1884 #undef mix 1885 1886 /* 1887 * bridge_rtnode_lookup: 1888 * 1889 * Look up a bridge route node for the specified destination. 1890 */ 1891 static struct bridge_rtnode * 1892 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1893 { 1894 struct bridge_rtnode *brt; 1895 uint32_t hash; 1896 int dir; 1897 1898 hash = bridge_rthash(sc, addr); 1899 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1900 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1901 if (dir == 0) 1902 return (brt); 1903 if (dir > 0) 1904 return (NULL); 1905 } 1906 1907 return (NULL); 1908 } 1909 1910 /* 1911 * bridge_rtnode_insert: 1912 * 1913 * Insert the specified bridge node into the route table. We 1914 * assume the entry is not already in the table. 1915 */ 1916 static int 1917 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1918 { 1919 struct bridge_rtnode *lbrt; 1920 uint32_t hash; 1921 int dir; 1922 1923 hash = bridge_rthash(sc, brt->brt_addr); 1924 1925 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1926 if (lbrt == NULL) { 1927 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1928 goto out; 1929 } 1930 1931 do { 1932 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1933 if (dir == 0) 1934 return (EEXIST); 1935 if (dir > 0) { 1936 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1937 goto out; 1938 } 1939 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1940 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1941 goto out; 1942 } 1943 lbrt = LIST_NEXT(lbrt, brt_hash); 1944 } while (lbrt != NULL); 1945 1946 #ifdef DIAGNOSTIC 1947 panic("bridge_rtnode_insert: impossible"); 1948 #endif 1949 1950 out: 1951 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1952 sc->sc_brtcnt++; 1953 1954 return (0); 1955 } 1956 1957 /* 1958 * bridge_rtnode_destroy: 1959 * 1960 * Destroy a bridge rtnode. 1961 */ 1962 static void 1963 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1964 { 1965 int s = splnet(); 1966 1967 LIST_REMOVE(brt, brt_hash); 1968 1969 LIST_REMOVE(brt, brt_list); 1970 sc->sc_brtcnt--; 1971 pool_put(&bridge_rtnode_pool, brt); 1972 1973 splx(s); 1974 } 1975 1976 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1977 extern struct pfil_head inet_pfil_hook; /* XXX */ 1978 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1979 1980 /* 1981 * Send bridge packets through IPF if they are one of the types IPF can deal 1982 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1983 * question.) 1984 */ 1985 static int 1986 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1987 { 1988 int snap, error; 1989 struct ether_header *eh1, eh2; 1990 struct llc llc1; 1991 uint16_t ether_type; 1992 1993 snap = 0; 1994 error = -1; /* Default error if not error == 0 */ 1995 eh1 = mtod(*mp, struct ether_header *); 1996 ether_type = ntohs(eh1->ether_type); 1997 1998 /* 1999 * Check for SNAP/LLC. 2000 */ 2001 if (ether_type < ETHERMTU) { 2002 struct llc *llc2 = (struct llc *)(eh1 + 1); 2003 2004 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2005 llc2->llc_dsap == LLC_SNAP_LSAP && 2006 llc2->llc_ssap == LLC_SNAP_LSAP && 2007 llc2->llc_control == LLC_UI) { 2008 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2009 snap = 1; 2010 } 2011 } 2012 2013 /* 2014 * If we're trying to filter bridge traffic, don't look at anything 2015 * other than IP and ARP traffic. If the filter doesn't understand 2016 * IPv6, don't allow IPv6 through the bridge either. This is lame 2017 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2018 * but of course we don't have an AppleTalk filter to begin with. 2019 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2020 * ARP traffic.) 2021 */ 2022 switch (ether_type) { 2023 case ETHERTYPE_ARP: 2024 case ETHERTYPE_REVARP: 2025 return 0; /* Automatically pass */ 2026 case ETHERTYPE_IP: 2027 # ifdef INET6 2028 case ETHERTYPE_IPV6: 2029 # endif /* INET6 */ 2030 break; 2031 default: 2032 goto bad; 2033 } 2034 2035 /* Strip off the Ethernet header and keep a copy. */ 2036 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2037 m_adj(*mp, ETHER_HDR_LEN); 2038 2039 /* Strip off snap header, if present */ 2040 if (snap) { 2041 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2042 m_adj(*mp, sizeof(struct llc)); 2043 } 2044 2045 /* 2046 * Check basic packet sanity and run IPF through pfil. 2047 */ 2048 KASSERT(!cpu_intr_p()); 2049 switch (ether_type) 2050 { 2051 case ETHERTYPE_IP : 2052 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2053 if (error == 0) 2054 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2055 break; 2056 # ifdef INET6 2057 case ETHERTYPE_IPV6 : 2058 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2059 if (error == 0) 2060 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2061 break; 2062 # endif 2063 default : 2064 error = 0; 2065 break; 2066 } 2067 2068 if (*mp == NULL) 2069 return error; 2070 if (error != 0) 2071 goto bad; 2072 2073 error = -1; 2074 2075 /* 2076 * Finally, put everything back the way it was and return 2077 */ 2078 if (snap) { 2079 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2080 if (*mp == NULL) 2081 return error; 2082 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2083 } 2084 2085 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2086 if (*mp == NULL) 2087 return error; 2088 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2089 2090 return 0; 2091 2092 bad: 2093 m_freem(*mp); 2094 *mp = NULL; 2095 return error; 2096 } 2097 2098 /* 2099 * Perform basic checks on header size since 2100 * IPF assumes ip_input has already processed 2101 * it for it. Cut-and-pasted from ip_input.c. 2102 * Given how simple the IPv6 version is, 2103 * does the IPv4 version really need to be 2104 * this complicated? 2105 * 2106 * XXX Should we update ipstat here, or not? 2107 * XXX Right now we update ipstat but not 2108 * XXX csum_counter. 2109 */ 2110 static int 2111 bridge_ip_checkbasic(struct mbuf **mp) 2112 { 2113 struct mbuf *m = *mp; 2114 struct ip *ip; 2115 int len, hlen; 2116 2117 if (*mp == NULL) 2118 return -1; 2119 2120 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2121 if ((m = m_copyup(m, sizeof(struct ip), 2122 (max_linkhdr + 3) & ~3)) == NULL) { 2123 /* XXXJRT new stat, please */ 2124 ip_statinc(IP_STAT_TOOSMALL); 2125 goto bad; 2126 } 2127 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2128 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2129 ip_statinc(IP_STAT_TOOSMALL); 2130 goto bad; 2131 } 2132 } 2133 ip = mtod(m, struct ip *); 2134 if (ip == NULL) goto bad; 2135 2136 if (ip->ip_v != IPVERSION) { 2137 ip_statinc(IP_STAT_BADVERS); 2138 goto bad; 2139 } 2140 hlen = ip->ip_hl << 2; 2141 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2142 ip_statinc(IP_STAT_BADHLEN); 2143 goto bad; 2144 } 2145 if (hlen > m->m_len) { 2146 if ((m = m_pullup(m, hlen)) == 0) { 2147 ip_statinc(IP_STAT_BADHLEN); 2148 goto bad; 2149 } 2150 ip = mtod(m, struct ip *); 2151 if (ip == NULL) goto bad; 2152 } 2153 2154 switch (m->m_pkthdr.csum_flags & 2155 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2156 M_CSUM_IPv4_BAD)) { 2157 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2158 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2159 goto bad; 2160 2161 case M_CSUM_IPv4: 2162 /* Checksum was okay. */ 2163 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2164 break; 2165 2166 default: 2167 /* Must compute it ourselves. */ 2168 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2169 if (in_cksum(m, hlen) != 0) 2170 goto bad; 2171 break; 2172 } 2173 2174 /* Retrieve the packet length. */ 2175 len = ntohs(ip->ip_len); 2176 2177 /* 2178 * Check for additional length bogosity 2179 */ 2180 if (len < hlen) { 2181 ip_statinc(IP_STAT_BADLEN); 2182 goto bad; 2183 } 2184 2185 /* 2186 * Check that the amount of data in the buffers 2187 * is as at least much as the IP header would have us expect. 2188 * Drop packet if shorter than we expect. 2189 */ 2190 if (m->m_pkthdr.len < len) { 2191 ip_statinc(IP_STAT_TOOSHORT); 2192 goto bad; 2193 } 2194 2195 /* Checks out, proceed */ 2196 *mp = m; 2197 return 0; 2198 2199 bad: 2200 *mp = m; 2201 return -1; 2202 } 2203 2204 # ifdef INET6 2205 /* 2206 * Same as above, but for IPv6. 2207 * Cut-and-pasted from ip6_input.c. 2208 * XXX Should we update ip6stat, or not? 2209 */ 2210 static int 2211 bridge_ip6_checkbasic(struct mbuf **mp) 2212 { 2213 struct mbuf *m = *mp; 2214 struct ip6_hdr *ip6; 2215 2216 /* 2217 * If the IPv6 header is not aligned, slurp it up into a new 2218 * mbuf with space for link headers, in the event we forward 2219 * it. Otherwise, if it is aligned, make sure the entire base 2220 * IPv6 header is in the first mbuf of the chain. 2221 */ 2222 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2223 struct ifnet *inifp = m->m_pkthdr.rcvif; 2224 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2225 (max_linkhdr + 3) & ~3)) == NULL) { 2226 /* XXXJRT new stat, please */ 2227 ip6_statinc(IP6_STAT_TOOSMALL); 2228 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2229 goto bad; 2230 } 2231 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2232 struct ifnet *inifp = m->m_pkthdr.rcvif; 2233 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2234 ip6_statinc(IP6_STAT_TOOSMALL); 2235 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2236 goto bad; 2237 } 2238 } 2239 2240 ip6 = mtod(m, struct ip6_hdr *); 2241 2242 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2243 ip6_statinc(IP6_STAT_BADVERS); 2244 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2245 goto bad; 2246 } 2247 2248 /* Checks out, proceed */ 2249 *mp = m; 2250 return 0; 2251 2252 bad: 2253 *mp = m; 2254 return -1; 2255 } 2256 # endif /* INET6 */ 2257 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2258
Indexes created Thu Oct 02 14:10:14 GMT 2025