1 /* $NetBSD: if_bridge.c,v 1.62 2008/06/15 16:37:21 christos 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@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 2008/06/15 16:37:21 christos 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> 100 101 #if NBPFILTER > 0 102 #include <net/bpf.h> 103 #endif 104 #include <net/if.h> 105 #include <net/if_dl.h> 106 #include <net/if_types.h> 107 #include <net/if_llc.h> 108 109 #include <net/if_ether.h> 110 #include <net/if_bridgevar.h> 111 112 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 113 /* Used for bridge_ip[6]_checkbasic */ 114 #include <netinet/in.h> 115 #include <netinet/in_systm.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #include <netinet/ip_private.h> /* XXX */ 119 120 #include <netinet/ip6.h> 121 #include <netinet6/in6_var.h> 122 #include <netinet6/ip6_var.h> 123 #include <netinet6/ip6_private.h> /* XXX */ 124 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 125 126 /* 127 * Size of the route hash table. Must be a power of two. 128 */ 129 #ifndef BRIDGE_RTHASH_SIZE 130 #define BRIDGE_RTHASH_SIZE 1024 131 #endif 132 133 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 134 135 #include "carp.h" 136 #if NCARP > 0 137 #include <netinet/in.h> 138 #include <netinet/in_var.h> 139 #include <netinet/ip_carp.h> 140 #endif 141 142 /* 143 * Maximum number of addresses to cache. 144 */ 145 #ifndef BRIDGE_RTABLE_MAX 146 #define BRIDGE_RTABLE_MAX 100 147 #endif 148 149 /* 150 * Spanning tree defaults. 151 */ 152 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 153 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 154 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 155 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 156 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 157 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 158 #define BSTP_DEFAULT_PATH_COST 55 159 160 /* 161 * Timeout (in seconds) for entries learned dynamically. 162 */ 163 #ifndef BRIDGE_RTABLE_TIMEOUT 164 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 165 #endif 166 167 /* 168 * Number of seconds between walks of the route list. 169 */ 170 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 171 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 172 #endif 173 174 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 175 176 static struct pool bridge_rtnode_pool; 177 178 void bridgeattach(int); 179 180 static int bridge_clone_create(struct if_clone *, int); 181 static int bridge_clone_destroy(struct ifnet *); 182 183 static int bridge_ioctl(struct ifnet *, u_long, void *); 184 static int bridge_init(struct ifnet *); 185 static void bridge_stop(struct ifnet *, int); 186 static void bridge_start(struct ifnet *); 187 188 static void bridge_forward(struct bridge_softc *, struct mbuf *m); 189 190 static void bridge_timer(void *); 191 192 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 193 struct mbuf *); 194 195 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 196 struct ifnet *, int, uint8_t); 197 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 198 static void bridge_rttrim(struct bridge_softc *); 199 static void bridge_rtage(struct bridge_softc *); 200 static void bridge_rtflush(struct bridge_softc *, int); 201 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 202 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 203 204 static int bridge_rtable_init(struct bridge_softc *); 205 static void bridge_rtable_fini(struct bridge_softc *); 206 207 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 208 const uint8_t *); 209 static int bridge_rtnode_insert(struct bridge_softc *, 210 struct bridge_rtnode *); 211 static void bridge_rtnode_destroy(struct bridge_softc *, 212 struct bridge_rtnode *); 213 214 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 215 const char *name); 216 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 217 struct ifnet *ifp); 218 static void bridge_delete_member(struct bridge_softc *, 219 struct bridge_iflist *); 220 221 static int bridge_ioctl_add(struct bridge_softc *, void *); 222 static int bridge_ioctl_del(struct bridge_softc *, void *); 223 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 224 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 225 static int bridge_ioctl_scache(struct bridge_softc *, void *); 226 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 227 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 228 static int bridge_ioctl_rts(struct bridge_softc *, void *); 229 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 230 static int bridge_ioctl_sto(struct bridge_softc *, void *); 231 static int bridge_ioctl_gto(struct bridge_softc *, void *); 232 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 233 static int bridge_ioctl_flush(struct bridge_softc *, void *); 234 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 235 static int bridge_ioctl_spri(struct bridge_softc *, void *); 236 static int bridge_ioctl_ght(struct bridge_softc *, void *); 237 static int bridge_ioctl_sht(struct bridge_softc *, void *); 238 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 239 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 240 static int bridge_ioctl_gma(struct bridge_softc *, void *); 241 static int bridge_ioctl_sma(struct bridge_softc *, void *); 242 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 243 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 244 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 245 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 246 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 247 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 248 static int bridge_ip_checkbasic(struct mbuf **mp); 249 # ifdef INET6 250 static int bridge_ip6_checkbasic(struct mbuf **mp); 251 # endif /* INET6 */ 252 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 253 254 struct bridge_control { 255 int (*bc_func)(struct bridge_softc *, void *); 256 int bc_argsize; 257 int bc_flags; 258 }; 259 260 #define BC_F_COPYIN 0x01 /* copy arguments in */ 261 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 262 #define BC_F_SUSER 0x04 /* do super-user check */ 263 264 static const struct bridge_control bridge_control_table[] = { 265 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 266 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 267 268 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 269 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 270 271 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 272 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 273 274 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 275 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 276 277 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 278 279 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 280 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 281 282 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 283 284 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 285 286 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 287 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 288 289 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 290 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 291 292 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 293 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 294 295 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 296 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 297 298 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 299 300 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 301 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 302 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 303 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 304 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 305 }; 306 static const int bridge_control_table_size = __arraycount(bridge_control_table); 307 308 static LIST_HEAD(, bridge_softc) bridge_list; 309 310 static struct if_clone bridge_cloner = 311 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 312 313 /* 314 * bridgeattach: 315 * 316 * Pseudo-device attach routine. 317 */ 318 void 319 bridgeattach(int n) 320 { 321 322 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 323 0, 0, 0, "brtpl", NULL, IPL_NET); 324 325 LIST_INIT(&bridge_list); 326 if_clone_attach(&bridge_cloner); 327 } 328 329 /* 330 * bridge_clone_create: 331 * 332 * Create a new bridge instance. 333 */ 334 static int 335 bridge_clone_create(struct if_clone *ifc, int unit) 336 { 337 struct bridge_softc *sc; 338 struct ifnet *ifp; 339 int s; 340 341 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 342 ifp = &sc->sc_if; 343 344 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 345 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 346 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 347 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 348 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 349 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 350 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 351 sc->sc_filter_flags = 0; 352 353 /* Initialize our routing table. */ 354 bridge_rtable_init(sc); 355 356 callout_init(&sc->sc_brcallout, 0); 357 callout_init(&sc->sc_bstpcallout, 0); 358 359 LIST_INIT(&sc->sc_iflist); 360 361 if_initname(ifp, ifc->ifc_name, unit); 362 ifp->if_softc = sc; 363 ifp->if_mtu = ETHERMTU; 364 ifp->if_ioctl = bridge_ioctl; 365 ifp->if_output = bridge_output; 366 ifp->if_start = bridge_start; 367 ifp->if_stop = bridge_stop; 368 ifp->if_init = bridge_init; 369 ifp->if_type = IFT_BRIDGE; 370 ifp->if_addrlen = 0; 371 ifp->if_dlt = DLT_EN10MB; 372 ifp->if_hdrlen = ETHER_HDR_LEN; 373 374 if_attach(ifp); 375 376 if_alloc_sadl(ifp); 377 378 s = splnet(); 379 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 380 splx(s); 381 382 return (0); 383 } 384 385 /* 386 * bridge_clone_destroy: 387 * 388 * Destroy a bridge instance. 389 */ 390 static int 391 bridge_clone_destroy(struct ifnet *ifp) 392 { 393 struct bridge_softc *sc = ifp->if_softc; 394 struct bridge_iflist *bif; 395 int s; 396 397 s = splnet(); 398 399 bridge_stop(ifp, 1); 400 401 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 402 bridge_delete_member(sc, bif); 403 404 LIST_REMOVE(sc, sc_list); 405 406 splx(s); 407 408 if_detach(ifp); 409 410 /* Tear down the routing table. */ 411 bridge_rtable_fini(sc); 412 413 free(sc, M_DEVBUF); 414 415 return (0); 416 } 417 418 /* 419 * bridge_ioctl: 420 * 421 * Handle a control request from the operator. 422 */ 423 static int 424 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 425 { 426 struct bridge_softc *sc = ifp->if_softc; 427 struct lwp *l = curlwp; /* XXX */ 428 union { 429 struct ifbreq ifbreq; 430 struct ifbifconf ifbifconf; 431 struct ifbareq ifbareq; 432 struct ifbaconf ifbaconf; 433 struct ifbrparam ifbrparam; 434 } args; 435 struct ifdrv *ifd = (struct ifdrv *) data; 436 const struct bridge_control *bc; 437 int s, error = 0; 438 439 s = splnet(); 440 441 switch (cmd) { 442 case SIOCGDRVSPEC: 443 case SIOCSDRVSPEC: 444 if (ifd->ifd_cmd >= bridge_control_table_size) { 445 error = EINVAL; 446 break; 447 } 448 bc = &bridge_control_table[ifd->ifd_cmd]; 449 450 if (cmd == SIOCGDRVSPEC && 451 (bc->bc_flags & BC_F_COPYOUT) == 0) { 452 error = EINVAL; 453 break; 454 } 455 else if (cmd == SIOCSDRVSPEC && 456 (bc->bc_flags & BC_F_COPYOUT) != 0) { 457 error = EINVAL; 458 break; 459 } 460 461 if (bc->bc_flags & BC_F_SUSER) { 462 error = kauth_authorize_generic(l->l_cred, 463 KAUTH_GENERIC_ISSUSER, NULL); 464 if (error) 465 break; 466 } 467 468 if (ifd->ifd_len != bc->bc_argsize || 469 ifd->ifd_len > sizeof(args)) { 470 error = EINVAL; 471 break; 472 } 473 474 memset(&args, 0, sizeof(args)); 475 if (bc->bc_flags & BC_F_COPYIN) { 476 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 477 if (error) 478 break; 479 } 480 481 error = (*bc->bc_func)(sc, &args); 482 if (error) 483 break; 484 485 if (bc->bc_flags & BC_F_COPYOUT) 486 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 487 488 break; 489 490 case SIOCSIFFLAGS: 491 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 492 /* 493 * If interface is marked down and it is running, 494 * then stop and disable it. 495 */ 496 (*ifp->if_stop)(ifp, 1); 497 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 498 /* 499 * If interface is marked up and it is stopped, then 500 * start it. 501 */ 502 error = (*ifp->if_init)(ifp); 503 } 504 break; 505 506 default: 507 error = ENOTTY; 508 break; 509 } 510 511 splx(s); 512 513 return (error); 514 } 515 516 /* 517 * bridge_lookup_member: 518 * 519 * Lookup a bridge member interface. Must be called at splnet(). 520 */ 521 static struct bridge_iflist * 522 bridge_lookup_member(struct bridge_softc *sc, const char *name) 523 { 524 struct bridge_iflist *bif; 525 struct ifnet *ifp; 526 527 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 528 ifp = bif->bif_ifp; 529 if (strcmp(ifp->if_xname, name) == 0) 530 return (bif); 531 } 532 533 return (NULL); 534 } 535 536 /* 537 * bridge_lookup_member_if: 538 * 539 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 540 */ 541 static struct bridge_iflist * 542 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 543 { 544 struct bridge_iflist *bif; 545 546 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 547 if (bif->bif_ifp == member_ifp) 548 return (bif); 549 } 550 551 return (NULL); 552 } 553 554 /* 555 * bridge_delete_member: 556 * 557 * Delete the specified member interface. 558 */ 559 static void 560 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 561 { 562 struct ifnet *ifs = bif->bif_ifp; 563 564 switch (ifs->if_type) { 565 case IFT_ETHER: 566 /* 567 * Take the interface out of promiscuous mode. 568 */ 569 (void) ifpromisc(ifs, 0); 570 break; 571 default: 572 #ifdef DIAGNOSTIC 573 panic("bridge_delete_member: impossible"); 574 #endif 575 break; 576 } 577 578 ifs->if_bridge = NULL; 579 LIST_REMOVE(bif, bif_next); 580 581 bridge_rtdelete(sc, ifs); 582 583 free(bif, M_DEVBUF); 584 585 if (sc->sc_if.if_flags & IFF_RUNNING) 586 bstp_initialization(sc); 587 } 588 589 static int 590 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 591 { 592 struct ifbreq *req = arg; 593 struct bridge_iflist *bif = NULL; 594 struct ifnet *ifs; 595 int error = 0; 596 597 ifs = ifunit(req->ifbr_ifsname); 598 if (ifs == NULL) 599 return (ENOENT); 600 601 if (sc->sc_if.if_mtu != ifs->if_mtu) 602 return (EINVAL); 603 604 if (ifs->if_bridge == sc) 605 return (EEXIST); 606 607 if (ifs->if_bridge != NULL) 608 return (EBUSY); 609 610 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 611 if (bif == NULL) 612 return (ENOMEM); 613 614 switch (ifs->if_type) { 615 case IFT_ETHER: 616 /* 617 * Place the interface into promiscuous mode. 618 */ 619 error = ifpromisc(ifs, 1); 620 if (error) 621 goto out; 622 break; 623 default: 624 error = EINVAL; 625 goto out; 626 } 627 628 bif->bif_ifp = ifs; 629 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 630 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 631 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 632 633 ifs->if_bridge = sc; 634 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 635 636 if (sc->sc_if.if_flags & IFF_RUNNING) 637 bstp_initialization(sc); 638 else 639 bstp_stop(sc); 640 641 out: 642 if (error) { 643 if (bif != NULL) 644 free(bif, M_DEVBUF); 645 } 646 return (error); 647 } 648 649 static int 650 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 651 { 652 struct ifbreq *req = arg; 653 struct bridge_iflist *bif; 654 655 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 656 if (bif == NULL) 657 return (ENOENT); 658 659 bridge_delete_member(sc, bif); 660 661 return (0); 662 } 663 664 static int 665 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 666 { 667 struct ifbreq *req = arg; 668 struct bridge_iflist *bif; 669 670 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 671 if (bif == NULL) 672 return (ENOENT); 673 674 req->ifbr_ifsflags = bif->bif_flags; 675 req->ifbr_state = bif->bif_state; 676 req->ifbr_priority = bif->bif_priority; 677 req->ifbr_path_cost = bif->bif_path_cost; 678 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 679 680 return (0); 681 } 682 683 static int 684 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 685 { 686 struct ifbreq *req = arg; 687 struct bridge_iflist *bif; 688 689 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 690 if (bif == NULL) 691 return (ENOENT); 692 693 if (req->ifbr_ifsflags & IFBIF_STP) { 694 switch (bif->bif_ifp->if_type) { 695 case IFT_ETHER: 696 /* These can do spanning tree. */ 697 break; 698 699 default: 700 /* Nothing else can. */ 701 return (EINVAL); 702 } 703 } 704 705 bif->bif_flags = req->ifbr_ifsflags; 706 707 if (sc->sc_if.if_flags & IFF_RUNNING) 708 bstp_initialization(sc); 709 710 return (0); 711 } 712 713 static int 714 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 715 { 716 struct ifbrparam *param = arg; 717 718 sc->sc_brtmax = param->ifbrp_csize; 719 bridge_rttrim(sc); 720 721 return (0); 722 } 723 724 static int 725 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 726 { 727 struct ifbrparam *param = arg; 728 729 param->ifbrp_csize = sc->sc_brtmax; 730 731 return (0); 732 } 733 734 static int 735 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 736 { 737 struct ifbifconf *bifc = arg; 738 struct bridge_iflist *bif; 739 struct ifbreq breq; 740 int count, len, error = 0; 741 742 count = 0; 743 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 744 count++; 745 746 if (bifc->ifbic_len == 0) { 747 bifc->ifbic_len = sizeof(breq) * count; 748 return (0); 749 } 750 751 count = 0; 752 len = bifc->ifbic_len; 753 memset(&breq, 0, sizeof breq); 754 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 755 if (len < sizeof(breq)) 756 break; 757 758 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 759 sizeof(breq.ifbr_ifsname)); 760 breq.ifbr_ifsflags = bif->bif_flags; 761 breq.ifbr_state = bif->bif_state; 762 breq.ifbr_priority = bif->bif_priority; 763 breq.ifbr_path_cost = bif->bif_path_cost; 764 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 765 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 766 if (error) 767 break; 768 count++; 769 len -= sizeof(breq); 770 } 771 772 bifc->ifbic_len = sizeof(breq) * count; 773 return (error); 774 } 775 776 static int 777 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 778 { 779 struct ifbaconf *bac = arg; 780 struct bridge_rtnode *brt; 781 struct ifbareq bareq; 782 int count = 0, error = 0, len; 783 784 if (bac->ifbac_len == 0) 785 return (0); 786 787 len = bac->ifbac_len; 788 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 789 if (len < sizeof(bareq)) 790 goto out; 791 memset(&bareq, 0, sizeof(bareq)); 792 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 793 sizeof(bareq.ifba_ifsname)); 794 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 795 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 796 bareq.ifba_expire = brt->brt_expire - time_uptime; 797 } else 798 bareq.ifba_expire = 0; 799 bareq.ifba_flags = brt->brt_flags; 800 801 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 802 if (error) 803 goto out; 804 count++; 805 len -= sizeof(bareq); 806 } 807 out: 808 bac->ifbac_len = sizeof(bareq) * count; 809 return (error); 810 } 811 812 static int 813 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 814 { 815 struct ifbareq *req = arg; 816 struct bridge_iflist *bif; 817 int error; 818 819 bif = bridge_lookup_member(sc, req->ifba_ifsname); 820 if (bif == NULL) 821 return (ENOENT); 822 823 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 824 req->ifba_flags); 825 826 return (error); 827 } 828 829 static int 830 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 831 { 832 struct ifbrparam *param = arg; 833 834 sc->sc_brttimeout = param->ifbrp_ctime; 835 836 return (0); 837 } 838 839 static int 840 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 841 { 842 struct ifbrparam *param = arg; 843 844 param->ifbrp_ctime = sc->sc_brttimeout; 845 846 return (0); 847 } 848 849 static int 850 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 851 { 852 struct ifbareq *req = arg; 853 854 return (bridge_rtdaddr(sc, req->ifba_dst)); 855 } 856 857 static int 858 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 859 { 860 struct ifbreq *req = arg; 861 862 bridge_rtflush(sc, req->ifbr_ifsflags); 863 864 return (0); 865 } 866 867 static int 868 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 869 { 870 struct ifbrparam *param = arg; 871 872 param->ifbrp_prio = sc->sc_bridge_priority; 873 874 return (0); 875 } 876 877 static int 878 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 879 { 880 struct ifbrparam *param = arg; 881 882 sc->sc_bridge_priority = param->ifbrp_prio; 883 884 if (sc->sc_if.if_flags & IFF_RUNNING) 885 bstp_initialization(sc); 886 887 return (0); 888 } 889 890 static int 891 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 892 { 893 struct ifbrparam *param = arg; 894 895 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 896 897 return (0); 898 } 899 900 static int 901 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 902 { 903 struct ifbrparam *param = arg; 904 905 if (param->ifbrp_hellotime == 0) 906 return (EINVAL); 907 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 908 909 if (sc->sc_if.if_flags & IFF_RUNNING) 910 bstp_initialization(sc); 911 912 return (0); 913 } 914 915 static int 916 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 917 { 918 struct ifbrparam *param = arg; 919 920 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 921 922 return (0); 923 } 924 925 static int 926 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 927 { 928 struct ifbrparam *param = arg; 929 930 if (param->ifbrp_fwddelay == 0) 931 return (EINVAL); 932 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 933 934 if (sc->sc_if.if_flags & IFF_RUNNING) 935 bstp_initialization(sc); 936 937 return (0); 938 } 939 940 static int 941 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 942 { 943 struct ifbrparam *param = arg; 944 945 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 946 947 return (0); 948 } 949 950 static int 951 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 952 { 953 struct ifbrparam *param = arg; 954 955 if (param->ifbrp_maxage == 0) 956 return (EINVAL); 957 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 958 959 if (sc->sc_if.if_flags & IFF_RUNNING) 960 bstp_initialization(sc); 961 962 return (0); 963 } 964 965 static int 966 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 967 { 968 struct ifbreq *req = arg; 969 struct bridge_iflist *bif; 970 971 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 972 if (bif == NULL) 973 return (ENOENT); 974 975 bif->bif_priority = req->ifbr_priority; 976 977 if (sc->sc_if.if_flags & IFF_RUNNING) 978 bstp_initialization(sc); 979 980 return (0); 981 } 982 983 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 984 static int 985 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 986 { 987 struct ifbrparam *param = arg; 988 989 param->ifbrp_filter = sc->sc_filter_flags; 990 991 return (0); 992 } 993 994 static int 995 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 996 { 997 struct ifbrparam *param = arg; 998 uint32_t nflags, oflags; 999 1000 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1001 return (EINVAL); 1002 1003 nflags = param->ifbrp_filter; 1004 oflags = sc->sc_filter_flags; 1005 1006 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1007 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1008 &sc->sc_if.if_pfil); 1009 } 1010 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1011 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1012 &sc->sc_if.if_pfil); 1013 } 1014 1015 sc->sc_filter_flags = nflags; 1016 1017 return (0); 1018 } 1019 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1020 1021 static int 1022 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1023 { 1024 struct ifbreq *req = arg; 1025 struct bridge_iflist *bif; 1026 1027 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1028 if (bif == NULL) 1029 return (ENOENT); 1030 1031 bif->bif_path_cost = req->ifbr_path_cost; 1032 1033 if (sc->sc_if.if_flags & IFF_RUNNING) 1034 bstp_initialization(sc); 1035 1036 return (0); 1037 } 1038 1039 /* 1040 * bridge_ifdetach: 1041 * 1042 * Detach an interface from a bridge. Called when a member 1043 * interface is detaching. 1044 */ 1045 void 1046 bridge_ifdetach(struct ifnet *ifp) 1047 { 1048 struct bridge_softc *sc = ifp->if_bridge; 1049 struct ifbreq breq; 1050 1051 memset(&breq, 0, sizeof(breq)); 1052 snprintf(breq.ifbr_ifsname, sizeof(breq.ifbr_ifsname), ifp->if_xname); 1053 1054 (void) bridge_ioctl_del(sc, &breq); 1055 } 1056 1057 /* 1058 * bridge_init: 1059 * 1060 * Initialize a bridge interface. 1061 */ 1062 static int 1063 bridge_init(struct ifnet *ifp) 1064 { 1065 struct bridge_softc *sc = ifp->if_softc; 1066 1067 if (ifp->if_flags & IFF_RUNNING) 1068 return (0); 1069 1070 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1071 bridge_timer, sc); 1072 1073 ifp->if_flags |= IFF_RUNNING; 1074 bstp_initialization(sc); 1075 return (0); 1076 } 1077 1078 /* 1079 * bridge_stop: 1080 * 1081 * Stop the bridge interface. 1082 */ 1083 static void 1084 bridge_stop(struct ifnet *ifp, int disable) 1085 { 1086 struct bridge_softc *sc = ifp->if_softc; 1087 1088 if ((ifp->if_flags & IFF_RUNNING) == 0) 1089 return; 1090 1091 callout_stop(&sc->sc_brcallout); 1092 bstp_stop(sc); 1093 1094 IF_PURGE(&ifp->if_snd); 1095 1096 bridge_rtflush(sc, IFBF_FLUSHDYN); 1097 1098 ifp->if_flags &= ~IFF_RUNNING; 1099 } 1100 1101 /* 1102 * bridge_enqueue: 1103 * 1104 * Enqueue a packet on a bridge member interface. 1105 * 1106 * NOTE: must be called at splnet(). 1107 */ 1108 void 1109 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1110 int runfilt) 1111 { 1112 ALTQ_DECL(struct altq_pktattr pktattr;) 1113 int len, error; 1114 short mflags; 1115 1116 /* 1117 * Clear any in-bound checksum flags for this packet. 1118 */ 1119 m->m_pkthdr.csum_flags = 0; 1120 1121 #ifdef PFIL_HOOKS 1122 if (runfilt) { 1123 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1124 dst_ifp, PFIL_OUT) != 0) { 1125 if (m != NULL) 1126 m_freem(m); 1127 return; 1128 } 1129 if (m == NULL) 1130 return; 1131 } 1132 #endif /* PFIL_HOOKS */ 1133 1134 #ifdef ALTQ 1135 /* 1136 * If ALTQ is enabled on the member interface, do 1137 * classification; the queueing discipline might 1138 * not require classification, but might require 1139 * the address family/header pointer in the pktattr. 1140 */ 1141 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1142 /* XXX IFT_ETHER */ 1143 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1144 } 1145 #endif /* ALTQ */ 1146 1147 len = m->m_pkthdr.len; 1148 m->m_flags |= M_PROTO1; 1149 mflags = m->m_flags; 1150 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1151 if (error) { 1152 /* mbuf is already freed */ 1153 sc->sc_if.if_oerrors++; 1154 return; 1155 } 1156 1157 sc->sc_if.if_opackets++; 1158 sc->sc_if.if_obytes += len; 1159 1160 dst_ifp->if_obytes += len; 1161 1162 if (mflags & M_MCAST) { 1163 sc->sc_if.if_omcasts++; 1164 dst_ifp->if_omcasts++; 1165 } 1166 1167 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1168 (*dst_ifp->if_start)(dst_ifp); 1169 } 1170 1171 /* 1172 * bridge_output: 1173 * 1174 * Send output from a bridge member interface. This 1175 * performs the bridging function for locally originated 1176 * packets. 1177 * 1178 * The mbuf has the Ethernet header already attached. We must 1179 * enqueue or free the mbuf before returning. 1180 */ 1181 int 1182 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1183 struct rtentry *rt) 1184 { 1185 struct ether_header *eh; 1186 struct ifnet *dst_if; 1187 struct bridge_softc *sc; 1188 int s; 1189 1190 if (m->m_len < ETHER_HDR_LEN) { 1191 m = m_pullup(m, ETHER_HDR_LEN); 1192 if (m == NULL) 1193 return (0); 1194 } 1195 1196 eh = mtod(m, struct ether_header *); 1197 sc = ifp->if_bridge; 1198 1199 s = splnet(); 1200 1201 /* 1202 * If bridge is down, but the original output interface is up, 1203 * go ahead and send out that interface. Otherwise, the packet 1204 * is dropped below. 1205 */ 1206 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1207 dst_if = ifp; 1208 goto sendunicast; 1209 } 1210 1211 /* 1212 * If the packet is a multicast, or we don't know a better way to 1213 * get there, send to all interfaces. 1214 */ 1215 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1216 dst_if = NULL; 1217 else 1218 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1219 if (dst_if == NULL) { 1220 struct bridge_iflist *bif; 1221 struct mbuf *mc; 1222 int used = 0; 1223 1224 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1225 dst_if = bif->bif_ifp; 1226 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1227 continue; 1228 1229 /* 1230 * If this is not the original output interface, 1231 * and the interface is participating in spanning 1232 * tree, make sure the port is in a state that 1233 * allows forwarding. 1234 */ 1235 if (dst_if != ifp && 1236 (bif->bif_flags & IFBIF_STP) != 0) { 1237 switch (bif->bif_state) { 1238 case BSTP_IFSTATE_BLOCKING: 1239 case BSTP_IFSTATE_LISTENING: 1240 case BSTP_IFSTATE_DISABLED: 1241 continue; 1242 } 1243 } 1244 1245 if (LIST_NEXT(bif, bif_next) == NULL) { 1246 used = 1; 1247 mc = m; 1248 } else { 1249 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1250 if (mc == NULL) { 1251 sc->sc_if.if_oerrors++; 1252 continue; 1253 } 1254 } 1255 1256 bridge_enqueue(sc, dst_if, mc, 0); 1257 } 1258 if (used == 0) 1259 m_freem(m); 1260 splx(s); 1261 return (0); 1262 } 1263 1264 sendunicast: 1265 /* 1266 * XXX Spanning tree consideration here? 1267 */ 1268 1269 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1270 m_freem(m); 1271 splx(s); 1272 return (0); 1273 } 1274 1275 bridge_enqueue(sc, dst_if, m, 0); 1276 1277 splx(s); 1278 return (0); 1279 } 1280 1281 /* 1282 * bridge_start: 1283 * 1284 * Start output on a bridge. 1285 * 1286 * NOTE: This routine should never be called in this implementation. 1287 */ 1288 static void 1289 bridge_start(struct ifnet *ifp) 1290 { 1291 1292 printf("%s: bridge_start() called\n", ifp->if_xname); 1293 } 1294 1295 /* 1296 * bridge_forward: 1297 * 1298 * The forwarding function of the bridge. 1299 */ 1300 static void 1301 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1302 { 1303 struct bridge_iflist *bif; 1304 struct ifnet *src_if, *dst_if; 1305 struct ether_header *eh; 1306 1307 src_if = m->m_pkthdr.rcvif; 1308 1309 sc->sc_if.if_ipackets++; 1310 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1311 1312 /* 1313 * Look up the bridge_iflist. 1314 */ 1315 bif = bridge_lookup_member_if(sc, src_if); 1316 if (bif == NULL) { 1317 /* Interface is not a bridge member (anymore?) */ 1318 m_freem(m); 1319 return; 1320 } 1321 1322 if (bif->bif_flags & IFBIF_STP) { 1323 switch (bif->bif_state) { 1324 case BSTP_IFSTATE_BLOCKING: 1325 case BSTP_IFSTATE_LISTENING: 1326 case BSTP_IFSTATE_DISABLED: 1327 m_freem(m); 1328 return; 1329 } 1330 } 1331 1332 eh = mtod(m, struct ether_header *); 1333 1334 /* 1335 * If the interface is learning, and the source 1336 * address is valid and not multicast, record 1337 * the address. 1338 */ 1339 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1340 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1341 (eh->ether_shost[0] == 0 && 1342 eh->ether_shost[1] == 0 && 1343 eh->ether_shost[2] == 0 && 1344 eh->ether_shost[3] == 0 && 1345 eh->ether_shost[4] == 0 && 1346 eh->ether_shost[5] == 0) == 0) { 1347 (void) bridge_rtupdate(sc, eh->ether_shost, 1348 src_if, 0, IFBAF_DYNAMIC); 1349 } 1350 1351 if ((bif->bif_flags & IFBIF_STP) != 0 && 1352 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1353 m_freem(m); 1354 return; 1355 } 1356 1357 /* 1358 * At this point, the port either doesn't participate 1359 * in spanning tree or it is in the forwarding state. 1360 */ 1361 1362 /* 1363 * If the packet is unicast, destined for someone on 1364 * "this" side of the bridge, drop it. 1365 */ 1366 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1367 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1368 if (src_if == dst_if) { 1369 m_freem(m); 1370 return; 1371 } 1372 } else { 1373 /* ...forward it to all interfaces. */ 1374 sc->sc_if.if_imcasts++; 1375 dst_if = NULL; 1376 } 1377 1378 #ifdef PFIL_HOOKS 1379 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1380 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1381 if (m != NULL) 1382 m_freem(m); 1383 return; 1384 } 1385 if (m == NULL) 1386 return; 1387 #endif /* PFIL_HOOKS */ 1388 1389 if (dst_if == NULL) { 1390 bridge_broadcast(sc, src_if, m); 1391 return; 1392 } 1393 1394 /* 1395 * At this point, we're dealing with a unicast frame 1396 * going to a different interface. 1397 */ 1398 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1399 m_freem(m); 1400 return; 1401 } 1402 bif = bridge_lookup_member_if(sc, dst_if); 1403 if (bif == NULL) { 1404 /* Not a member of the bridge (anymore?) */ 1405 m_freem(m); 1406 return; 1407 } 1408 1409 if (bif->bif_flags & IFBIF_STP) { 1410 switch (bif->bif_state) { 1411 case BSTP_IFSTATE_DISABLED: 1412 case BSTP_IFSTATE_BLOCKING: 1413 m_freem(m); 1414 return; 1415 } 1416 } 1417 1418 bridge_enqueue(sc, dst_if, m, 1); 1419 } 1420 1421 /* 1422 * bridge_input: 1423 * 1424 * Receive input from a member interface. Queue the packet for 1425 * bridging if it is not for us. 1426 */ 1427 struct mbuf * 1428 bridge_input(struct ifnet *ifp, struct mbuf *m) 1429 { 1430 struct bridge_softc *sc = ifp->if_bridge; 1431 struct bridge_iflist *bif; 1432 struct ether_header *eh; 1433 struct mbuf *mc; 1434 1435 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1436 return (m); 1437 1438 bif = bridge_lookup_member_if(sc, ifp); 1439 if (bif == NULL) 1440 return (m); 1441 1442 eh = mtod(m, struct ether_header *); 1443 1444 if (m->m_flags & (M_BCAST|M_MCAST)) { 1445 /* Tap off 802.1D packets; they do not get forwarded. */ 1446 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1447 ETHER_ADDR_LEN) == 0) { 1448 m = bstp_input(ifp, m); 1449 if (m == NULL) 1450 return (NULL); 1451 } 1452 1453 if (bif->bif_flags & IFBIF_STP) { 1454 switch (bif->bif_state) { 1455 case BSTP_IFSTATE_BLOCKING: 1456 case BSTP_IFSTATE_LISTENING: 1457 case BSTP_IFSTATE_DISABLED: 1458 return (m); 1459 } 1460 } 1461 1462 /* 1463 * Make a deep copy of the packet and enqueue the copy 1464 * for bridge processing; return the original packet for 1465 * local processing. 1466 */ 1467 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1468 if (mc == NULL) 1469 return (m); 1470 1471 /* Perform the bridge forwarding function with the copy. */ 1472 bridge_forward(sc, mc); 1473 1474 /* Return the original packet for local processing. */ 1475 return (m); 1476 } 1477 1478 if (bif->bif_flags & IFBIF_STP) { 1479 switch (bif->bif_state) { 1480 case BSTP_IFSTATE_BLOCKING: 1481 case BSTP_IFSTATE_LISTENING: 1482 case BSTP_IFSTATE_DISABLED: 1483 return (m); 1484 } 1485 } 1486 1487 /* 1488 * Unicast. Make sure it's not for us. 1489 */ 1490 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1491 /* It is destined for us. */ 1492 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1493 ETHER_ADDR_LEN) == 0 1494 #if NCARP > 0 1495 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1496 eh, IFT_ETHER, 0) != NULL) 1497 #endif /* NCARP > 0 */ 1498 ) { 1499 if (bif->bif_flags & IFBIF_LEARNING) 1500 (void) bridge_rtupdate(sc, 1501 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1502 m->m_pkthdr.rcvif = bif->bif_ifp; 1503 return (m); 1504 } 1505 1506 /* We just received a packet that we sent out. */ 1507 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1508 ETHER_ADDR_LEN) == 0 1509 #if NCARP > 0 1510 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1511 eh, IFT_ETHER, 1) != NULL) 1512 #endif /* NCARP > 0 */ 1513 ) { 1514 m_freem(m); 1515 return (NULL); 1516 } 1517 } 1518 1519 /* Perform the bridge forwarding function. */ 1520 bridge_forward(sc, m); 1521 1522 return (NULL); 1523 } 1524 1525 /* 1526 * bridge_broadcast: 1527 * 1528 * Send a frame to all interfaces that are members of 1529 * the bridge, except for the one on which the packet 1530 * arrived. 1531 */ 1532 static void 1533 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1534 struct mbuf *m) 1535 { 1536 struct bridge_iflist *bif; 1537 struct mbuf *mc; 1538 struct ifnet *dst_if; 1539 int used = 0; 1540 1541 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1542 dst_if = bif->bif_ifp; 1543 if (dst_if == src_if) 1544 continue; 1545 1546 if (bif->bif_flags & IFBIF_STP) { 1547 switch (bif->bif_state) { 1548 case BSTP_IFSTATE_BLOCKING: 1549 case BSTP_IFSTATE_DISABLED: 1550 continue; 1551 } 1552 } 1553 1554 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1555 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1556 continue; 1557 1558 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1559 continue; 1560 1561 if (LIST_NEXT(bif, bif_next) == NULL) { 1562 mc = m; 1563 used = 1; 1564 } else { 1565 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1566 if (mc == NULL) { 1567 sc->sc_if.if_oerrors++; 1568 continue; 1569 } 1570 } 1571 1572 bridge_enqueue(sc, dst_if, mc, 1); 1573 } 1574 if (used == 0) 1575 m_freem(m); 1576 } 1577 1578 /* 1579 * bridge_rtupdate: 1580 * 1581 * Add a bridge routing entry. 1582 */ 1583 static int 1584 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1585 struct ifnet *dst_if, int setflags, uint8_t flags) 1586 { 1587 struct bridge_rtnode *brt; 1588 int error, s; 1589 1590 /* 1591 * A route for this destination might already exist. If so, 1592 * update it, otherwise create a new one. 1593 */ 1594 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1595 if (sc->sc_brtcnt >= sc->sc_brtmax) 1596 return (ENOSPC); 1597 1598 /* 1599 * Allocate a new bridge forwarding node, and 1600 * initialize the expiration time and Ethernet 1601 * address. 1602 */ 1603 s = splnet(); 1604 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1605 splx(s); 1606 if (brt == NULL) 1607 return (ENOMEM); 1608 1609 memset(brt, 0, sizeof(*brt)); 1610 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1611 brt->brt_flags = IFBAF_DYNAMIC; 1612 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1613 1614 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1615 s = splnet(); 1616 pool_put(&bridge_rtnode_pool, brt); 1617 splx(s); 1618 return (error); 1619 } 1620 } 1621 1622 brt->brt_ifp = dst_if; 1623 if (setflags) { 1624 brt->brt_flags = flags; 1625 if (flags & IFBAF_STATIC) 1626 brt->brt_expire = 0; 1627 else 1628 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1629 } 1630 1631 return (0); 1632 } 1633 1634 /* 1635 * bridge_rtlookup: 1636 * 1637 * Lookup the destination interface for an address. 1638 */ 1639 static struct ifnet * 1640 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1641 { 1642 struct bridge_rtnode *brt; 1643 1644 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1645 return (NULL); 1646 1647 return (brt->brt_ifp); 1648 } 1649 1650 /* 1651 * bridge_rttrim: 1652 * 1653 * Trim the routine table so that we have a number 1654 * of routing entries less than or equal to the 1655 * maximum number. 1656 */ 1657 static void 1658 bridge_rttrim(struct bridge_softc *sc) 1659 { 1660 struct bridge_rtnode *brt, *nbrt; 1661 1662 /* Make sure we actually need to do this. */ 1663 if (sc->sc_brtcnt <= sc->sc_brtmax) 1664 return; 1665 1666 /* Force an aging cycle; this might trim enough addresses. */ 1667 bridge_rtage(sc); 1668 if (sc->sc_brtcnt <= sc->sc_brtmax) 1669 return; 1670 1671 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1672 nbrt = LIST_NEXT(brt, brt_list); 1673 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1674 bridge_rtnode_destroy(sc, brt); 1675 if (sc->sc_brtcnt <= sc->sc_brtmax) 1676 return; 1677 } 1678 } 1679 } 1680 1681 /* 1682 * bridge_timer: 1683 * 1684 * Aging timer for the bridge. 1685 */ 1686 static void 1687 bridge_timer(void *arg) 1688 { 1689 struct bridge_softc *sc = arg; 1690 int s; 1691 1692 s = splnet(); 1693 bridge_rtage(sc); 1694 splx(s); 1695 1696 if (sc->sc_if.if_flags & IFF_RUNNING) 1697 callout_reset(&sc->sc_brcallout, 1698 bridge_rtable_prune_period * hz, bridge_timer, sc); 1699 } 1700 1701 /* 1702 * bridge_rtage: 1703 * 1704 * Perform an aging cycle. 1705 */ 1706 static void 1707 bridge_rtage(struct bridge_softc *sc) 1708 { 1709 struct bridge_rtnode *brt, *nbrt; 1710 1711 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1712 nbrt = LIST_NEXT(brt, brt_list); 1713 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1714 if (time_uptime >= brt->brt_expire) 1715 bridge_rtnode_destroy(sc, brt); 1716 } 1717 } 1718 } 1719 1720 /* 1721 * bridge_rtflush: 1722 * 1723 * Remove all dynamic addresses from the bridge. 1724 */ 1725 static void 1726 bridge_rtflush(struct bridge_softc *sc, int full) 1727 { 1728 struct bridge_rtnode *brt, *nbrt; 1729 1730 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1731 nbrt = LIST_NEXT(brt, brt_list); 1732 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1733 bridge_rtnode_destroy(sc, brt); 1734 } 1735 } 1736 1737 /* 1738 * bridge_rtdaddr: 1739 * 1740 * Remove an address from the table. 1741 */ 1742 static int 1743 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1744 { 1745 struct bridge_rtnode *brt; 1746 1747 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1748 return (ENOENT); 1749 1750 bridge_rtnode_destroy(sc, brt); 1751 return (0); 1752 } 1753 1754 /* 1755 * bridge_rtdelete: 1756 * 1757 * Delete routes to a speicifc member interface. 1758 */ 1759 static void 1760 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1761 { 1762 struct bridge_rtnode *brt, *nbrt; 1763 1764 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1765 nbrt = LIST_NEXT(brt, brt_list); 1766 if (brt->brt_ifp == ifp) 1767 bridge_rtnode_destroy(sc, brt); 1768 } 1769 } 1770 1771 /* 1772 * bridge_rtable_init: 1773 * 1774 * Initialize the route table for this bridge. 1775 */ 1776 static int 1777 bridge_rtable_init(struct bridge_softc *sc) 1778 { 1779 int i; 1780 1781 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1782 M_DEVBUF, M_NOWAIT); 1783 if (sc->sc_rthash == NULL) 1784 return (ENOMEM); 1785 1786 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1787 LIST_INIT(&sc->sc_rthash[i]); 1788 1789 sc->sc_rthash_key = arc4random(); 1790 1791 LIST_INIT(&sc->sc_rtlist); 1792 1793 return (0); 1794 } 1795 1796 /* 1797 * bridge_rtable_fini: 1798 * 1799 * Deconstruct the route table for this bridge. 1800 */ 1801 static void 1802 bridge_rtable_fini(struct bridge_softc *sc) 1803 { 1804 1805 free(sc->sc_rthash, M_DEVBUF); 1806 } 1807 1808 /* 1809 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1810 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1811 */ 1812 #define mix(a, b, c) \ 1813 do { \ 1814 a -= b; a -= c; a ^= (c >> 13); \ 1815 b -= c; b -= a; b ^= (a << 8); \ 1816 c -= a; c -= b; c ^= (b >> 13); \ 1817 a -= b; a -= c; a ^= (c >> 12); \ 1818 b -= c; b -= a; b ^= (a << 16); \ 1819 c -= a; c -= b; c ^= (b >> 5); \ 1820 a -= b; a -= c; a ^= (c >> 3); \ 1821 b -= c; b -= a; b ^= (a << 10); \ 1822 c -= a; c -= b; c ^= (b >> 15); \ 1823 } while (/*CONSTCOND*/0) 1824 1825 static inline uint32_t 1826 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1827 { 1828 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1829 1830 b += addr[5] << 8; 1831 b += addr[4]; 1832 a += addr[3] << 24; 1833 a += addr[2] << 16; 1834 a += addr[1] << 8; 1835 a += addr[0]; 1836 1837 mix(a, b, c); 1838 1839 return (c & BRIDGE_RTHASH_MASK); 1840 } 1841 1842 #undef mix 1843 1844 /* 1845 * bridge_rtnode_lookup: 1846 * 1847 * Look up a bridge route node for the specified destination. 1848 */ 1849 static struct bridge_rtnode * 1850 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1851 { 1852 struct bridge_rtnode *brt; 1853 uint32_t hash; 1854 int dir; 1855 1856 hash = bridge_rthash(sc, addr); 1857 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1858 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1859 if (dir == 0) 1860 return (brt); 1861 if (dir > 0) 1862 return (NULL); 1863 } 1864 1865 return (NULL); 1866 } 1867 1868 /* 1869 * bridge_rtnode_insert: 1870 * 1871 * Insert the specified bridge node into the route table. We 1872 * assume the entry is not already in the table. 1873 */ 1874 static int 1875 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1876 { 1877 struct bridge_rtnode *lbrt; 1878 uint32_t hash; 1879 int dir; 1880 1881 hash = bridge_rthash(sc, brt->brt_addr); 1882 1883 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1884 if (lbrt == NULL) { 1885 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1886 goto out; 1887 } 1888 1889 do { 1890 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1891 if (dir == 0) 1892 return (EEXIST); 1893 if (dir > 0) { 1894 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1895 goto out; 1896 } 1897 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1898 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1899 goto out; 1900 } 1901 lbrt = LIST_NEXT(lbrt, brt_hash); 1902 } while (lbrt != NULL); 1903 1904 #ifdef DIAGNOSTIC 1905 panic("bridge_rtnode_insert: impossible"); 1906 #endif 1907 1908 out: 1909 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1910 sc->sc_brtcnt++; 1911 1912 return (0); 1913 } 1914 1915 /* 1916 * bridge_rtnode_destroy: 1917 * 1918 * Destroy a bridge rtnode. 1919 */ 1920 static void 1921 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1922 { 1923 int s = splnet(); 1924 1925 LIST_REMOVE(brt, brt_hash); 1926 1927 LIST_REMOVE(brt, brt_list); 1928 sc->sc_brtcnt--; 1929 pool_put(&bridge_rtnode_pool, brt); 1930 1931 splx(s); 1932 } 1933 1934 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1935 extern struct pfil_head inet_pfil_hook; /* XXX */ 1936 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1937 1938 /* 1939 * Send bridge packets through IPF if they are one of the types IPF can deal 1940 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1941 * question.) 1942 */ 1943 static int 1944 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1945 { 1946 int snap, error; 1947 struct ether_header *eh1, eh2; 1948 struct llc llc1; 1949 uint16_t ether_type; 1950 1951 snap = 0; 1952 error = -1; /* Default error if not error == 0 */ 1953 eh1 = mtod(*mp, struct ether_header *); 1954 ether_type = ntohs(eh1->ether_type); 1955 1956 /* 1957 * Check for SNAP/LLC. 1958 */ 1959 if (ether_type < ETHERMTU) { 1960 struct llc *llc2 = (struct llc *)(eh1 + 1); 1961 1962 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1963 llc2->llc_dsap == LLC_SNAP_LSAP && 1964 llc2->llc_ssap == LLC_SNAP_LSAP && 1965 llc2->llc_control == LLC_UI) { 1966 ether_type = htons(llc2->llc_un.type_snap.ether_type); 1967 snap = 1; 1968 } 1969 } 1970 1971 /* 1972 * If we're trying to filter bridge traffic, don't look at anything 1973 * other than IP and ARP traffic. If the filter doesn't understand 1974 * IPv6, don't allow IPv6 through the bridge either. This is lame 1975 * since if we really wanted, say, an AppleTalk filter, we are hosed, 1976 * but of course we don't have an AppleTalk filter to begin with. 1977 * (Note that since IPF doesn't understand ARP it will pass *ALL* 1978 * ARP traffic.) 1979 */ 1980 switch (ether_type) { 1981 case ETHERTYPE_ARP: 1982 case ETHERTYPE_REVARP: 1983 return 0; /* Automatically pass */ 1984 case ETHERTYPE_IP: 1985 # ifdef INET6 1986 case ETHERTYPE_IPV6: 1987 # endif /* INET6 */ 1988 break; 1989 default: 1990 goto bad; 1991 } 1992 1993 /* Strip off the Ethernet header and keep a copy. */ 1994 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 1995 m_adj(*mp, ETHER_HDR_LEN); 1996 1997 /* Strip off snap header, if present */ 1998 if (snap) { 1999 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2000 m_adj(*mp, sizeof(struct llc)); 2001 } 2002 2003 /* 2004 * Check basic packet sanity and run IPF through pfil. 2005 */ 2006 switch (ether_type) 2007 { 2008 case ETHERTYPE_IP : 2009 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2010 if (error == 0) 2011 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2012 break; 2013 # ifdef INET6 2014 case ETHERTYPE_IPV6 : 2015 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2016 if (error == 0) 2017 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2018 break; 2019 # endif 2020 default : 2021 error = 0; 2022 break; 2023 } 2024 2025 if (*mp == NULL) 2026 return error; 2027 if (error != 0) 2028 goto bad; 2029 2030 error = -1; 2031 2032 /* 2033 * Finally, put everything back the way it was and return 2034 */ 2035 if (snap) { 2036 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2037 if (*mp == NULL) 2038 return error; 2039 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2040 } 2041 2042 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2043 if (*mp == NULL) 2044 return error; 2045 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2046 2047 return 0; 2048 2049 bad: 2050 m_freem(*mp); 2051 *mp = NULL; 2052 return error; 2053 } 2054 2055 /* 2056 * Perform basic checks on header size since 2057 * IPF assumes ip_input has already processed 2058 * it for it. Cut-and-pasted from ip_input.c. 2059 * Given how simple the IPv6 version is, 2060 * does the IPv4 version really need to be 2061 * this complicated? 2062 * 2063 * XXX Should we update ipstat here, or not? 2064 * XXX Right now we update ipstat but not 2065 * XXX csum_counter. 2066 */ 2067 static int 2068 bridge_ip_checkbasic(struct mbuf **mp) 2069 { 2070 struct mbuf *m = *mp; 2071 struct ip *ip; 2072 int len, hlen; 2073 2074 if (*mp == NULL) 2075 return -1; 2076 2077 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2078 if ((m = m_copyup(m, sizeof(struct ip), 2079 (max_linkhdr + 3) & ~3)) == NULL) { 2080 /* XXXJRT new stat, please */ 2081 ip_statinc(IP_STAT_TOOSMALL); 2082 goto bad; 2083 } 2084 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2085 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2086 ip_statinc(IP_STAT_TOOSMALL); 2087 goto bad; 2088 } 2089 } 2090 ip = mtod(m, struct ip *); 2091 if (ip == NULL) goto bad; 2092 2093 if (ip->ip_v != IPVERSION) { 2094 ip_statinc(IP_STAT_BADVERS); 2095 goto bad; 2096 } 2097 hlen = ip->ip_hl << 2; 2098 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2099 ip_statinc(IP_STAT_BADHLEN); 2100 goto bad; 2101 } 2102 if (hlen > m->m_len) { 2103 if ((m = m_pullup(m, hlen)) == 0) { 2104 ip_statinc(IP_STAT_BADHLEN); 2105 goto bad; 2106 } 2107 ip = mtod(m, struct ip *); 2108 if (ip == NULL) goto bad; 2109 } 2110 2111 switch (m->m_pkthdr.csum_flags & 2112 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2113 M_CSUM_IPv4_BAD)) { 2114 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2115 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2116 goto bad; 2117 2118 case M_CSUM_IPv4: 2119 /* Checksum was okay. */ 2120 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2121 break; 2122 2123 default: 2124 /* Must compute it ourselves. */ 2125 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2126 if (in_cksum(m, hlen) != 0) 2127 goto bad; 2128 break; 2129 } 2130 2131 /* Retrieve the packet length. */ 2132 len = ntohs(ip->ip_len); 2133 2134 /* 2135 * Check for additional length bogosity 2136 */ 2137 if (len < hlen) { 2138 ip_statinc(IP_STAT_BADLEN); 2139 goto bad; 2140 } 2141 2142 /* 2143 * Check that the amount of data in the buffers 2144 * is as at least much as the IP header would have us expect. 2145 * Drop packet if shorter than we expect. 2146 */ 2147 if (m->m_pkthdr.len < len) { 2148 ip_statinc(IP_STAT_TOOSHORT); 2149 goto bad; 2150 } 2151 2152 /* Checks out, proceed */ 2153 *mp = m; 2154 return 0; 2155 2156 bad: 2157 *mp = m; 2158 return -1; 2159 } 2160 2161 # ifdef INET6 2162 /* 2163 * Same as above, but for IPv6. 2164 * Cut-and-pasted from ip6_input.c. 2165 * XXX Should we update ip6stat, or not? 2166 */ 2167 static int 2168 bridge_ip6_checkbasic(struct mbuf **mp) 2169 { 2170 struct mbuf *m = *mp; 2171 struct ip6_hdr *ip6; 2172 2173 /* 2174 * If the IPv6 header is not aligned, slurp it up into a new 2175 * mbuf with space for link headers, in the event we forward 2176 * it. Otherwise, if it is aligned, make sure the entire base 2177 * IPv6 header is in the first mbuf of the chain. 2178 */ 2179 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2180 struct ifnet *inifp = m->m_pkthdr.rcvif; 2181 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2182 (max_linkhdr + 3) & ~3)) == NULL) { 2183 /* XXXJRT new stat, please */ 2184 ip6_statinc(IP6_STAT_TOOSMALL); 2185 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2186 goto bad; 2187 } 2188 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2189 struct ifnet *inifp = m->m_pkthdr.rcvif; 2190 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2191 ip6_statinc(IP6_STAT_TOOSMALL); 2192 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2193 goto bad; 2194 } 2195 } 2196 2197 ip6 = mtod(m, struct ip6_hdr *); 2198 2199 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2200 ip6_statinc(IP6_STAT_BADVERS); 2201 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2202 goto bad; 2203 } 2204 2205 /* Checks out, proceed */ 2206 *mp = m; 2207 return 0; 2208 2209 bad: 2210 *mp = m; 2211 return -1; 2212 } 2213 # endif /* INET6 */ 2214 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2215