if_bridge.c revision 1.50
1 /* $NetBSD: if_bridge.c,v 1.50 2007/03/04 06:03:15 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 (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 1.50 2007/03/04 06:03:15 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> 118 119 #include <netinet/ip6.h> 120 #include <netinet6/in6_var.h> 121 #include <netinet6/ip6_var.h> 122 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 123 124 /* 125 * Size of the route hash table. Must be a power of two. 126 */ 127 #ifndef BRIDGE_RTHASH_SIZE 128 #define BRIDGE_RTHASH_SIZE 1024 129 #endif 130 131 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 132 133 #include "carp.h" 134 #if NCARP > 0 135 #include <netinet/in.h> 136 #include <netinet/in_var.h> 137 #include <netinet/ip_carp.h> 138 #endif 139 140 /* 141 * Maximum number of addresses to cache. 142 */ 143 #ifndef BRIDGE_RTABLE_MAX 144 #define BRIDGE_RTABLE_MAX 100 145 #endif 146 147 /* 148 * Spanning tree defaults. 149 */ 150 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 151 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 152 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 153 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 154 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 155 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 156 #define BSTP_DEFAULT_PATH_COST 55 157 158 /* 159 * Timeout (in seconds) for entries learned dynamically. 160 */ 161 #ifndef BRIDGE_RTABLE_TIMEOUT 162 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 163 #endif 164 165 /* 166 * Number of seconds between walks of the route list. 167 */ 168 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 169 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 170 #endif 171 172 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 173 174 static struct pool bridge_rtnode_pool; 175 176 void bridgeattach(int); 177 178 static int bridge_clone_create(struct if_clone *, int); 179 static int bridge_clone_destroy(struct ifnet *); 180 181 static int bridge_ioctl(struct ifnet *, u_long, void *); 182 static int bridge_init(struct ifnet *); 183 static void bridge_stop(struct ifnet *, int); 184 static void bridge_start(struct ifnet *); 185 186 static void bridge_forward(struct bridge_softc *, struct mbuf *m); 187 188 static void bridge_timer(void *); 189 190 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 191 struct mbuf *); 192 193 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 194 struct ifnet *, int, uint8_t); 195 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 196 static void bridge_rttrim(struct bridge_softc *); 197 static void bridge_rtage(struct bridge_softc *); 198 static void bridge_rtflush(struct bridge_softc *, int); 199 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 200 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 201 202 static int bridge_rtable_init(struct bridge_softc *); 203 static void bridge_rtable_fini(struct bridge_softc *); 204 205 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 206 const uint8_t *); 207 static int bridge_rtnode_insert(struct bridge_softc *, 208 struct bridge_rtnode *); 209 static void bridge_rtnode_destroy(struct bridge_softc *, 210 struct bridge_rtnode *); 211 212 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 213 const char *name); 214 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 215 struct ifnet *ifp); 216 static void bridge_delete_member(struct bridge_softc *, 217 struct bridge_iflist *); 218 219 static int bridge_ioctl_add(struct bridge_softc *, void *); 220 static int bridge_ioctl_del(struct bridge_softc *, void *); 221 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 222 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 223 static int bridge_ioctl_scache(struct bridge_softc *, void *); 224 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 225 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 226 static int bridge_ioctl_rts(struct bridge_softc *, void *); 227 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 228 static int bridge_ioctl_sto(struct bridge_softc *, void *); 229 static int bridge_ioctl_gto(struct bridge_softc *, void *); 230 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 231 static int bridge_ioctl_flush(struct bridge_softc *, void *); 232 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 233 static int bridge_ioctl_spri(struct bridge_softc *, void *); 234 static int bridge_ioctl_ght(struct bridge_softc *, void *); 235 static int bridge_ioctl_sht(struct bridge_softc *, void *); 236 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 237 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 238 static int bridge_ioctl_gma(struct bridge_softc *, void *); 239 static int bridge_ioctl_sma(struct bridge_softc *, void *); 240 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 241 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 242 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 243 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 244 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 245 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 246 static int bridge_ip_checkbasic(struct mbuf **mp); 247 # ifdef INET6 248 static int bridge_ip6_checkbasic(struct mbuf **mp); 249 # endif /* INET6 */ 250 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 251 252 struct bridge_control { 253 int (*bc_func)(struct bridge_softc *, void *); 254 int bc_argsize; 255 int bc_flags; 256 }; 257 258 #define BC_F_COPYIN 0x01 /* copy arguments in */ 259 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 260 #define BC_F_SUSER 0x04 /* do super-user check */ 261 262 static const struct bridge_control bridge_control_table[] = { 263 { bridge_ioctl_add, sizeof(struct ifbreq), 264 BC_F_COPYIN|BC_F_SUSER }, 265 { bridge_ioctl_del, sizeof(struct ifbreq), 266 BC_F_COPYIN|BC_F_SUSER }, 267 268 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 269 BC_F_COPYIN|BC_F_COPYOUT }, 270 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 271 BC_F_COPYIN|BC_F_SUSER }, 272 273 { bridge_ioctl_scache, sizeof(struct ifbrparam), 274 BC_F_COPYIN|BC_F_SUSER }, 275 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 276 BC_F_COPYOUT }, 277 278 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 279 BC_F_COPYIN|BC_F_COPYOUT }, 280 { bridge_ioctl_rts, sizeof(struct ifbaconf), 281 BC_F_COPYIN|BC_F_COPYOUT }, 282 283 { bridge_ioctl_saddr, sizeof(struct ifbareq), 284 BC_F_COPYIN|BC_F_SUSER }, 285 286 { bridge_ioctl_sto, sizeof(struct ifbrparam), 287 BC_F_COPYIN|BC_F_SUSER }, 288 { bridge_ioctl_gto, sizeof(struct ifbrparam), 289 BC_F_COPYOUT }, 290 291 { bridge_ioctl_daddr, sizeof(struct ifbareq), 292 BC_F_COPYIN|BC_F_SUSER }, 293 294 { bridge_ioctl_flush, sizeof(struct ifbreq), 295 BC_F_COPYIN|BC_F_SUSER }, 296 297 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 298 BC_F_COPYOUT }, 299 { bridge_ioctl_spri, sizeof(struct ifbrparam), 300 BC_F_COPYIN|BC_F_SUSER }, 301 302 { bridge_ioctl_ght, sizeof(struct ifbrparam), 303 BC_F_COPYOUT }, 304 { bridge_ioctl_sht, sizeof(struct ifbrparam), 305 BC_F_COPYIN|BC_F_SUSER }, 306 307 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 308 BC_F_COPYOUT }, 309 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 310 BC_F_COPYIN|BC_F_SUSER }, 311 312 { bridge_ioctl_gma, sizeof(struct ifbrparam), 313 BC_F_COPYOUT }, 314 { bridge_ioctl_sma, sizeof(struct ifbrparam), 315 BC_F_COPYIN|BC_F_SUSER }, 316 317 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 318 BC_F_COPYIN|BC_F_SUSER }, 319 320 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 321 BC_F_COPYIN|BC_F_SUSER }, 322 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 323 { bridge_ioctl_gfilt, sizeof(struct ifbrparam), 324 BC_F_COPYOUT }, 325 { bridge_ioctl_sfilt, sizeof(struct ifbrparam), 326 BC_F_COPYIN|BC_F_SUSER }, 327 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 328 }; 329 static const int bridge_control_table_size = __arraycount(bridge_control_table); 330 331 static LIST_HEAD(, bridge_softc) bridge_list; 332 333 static struct if_clone bridge_cloner = 334 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 335 336 /* 337 * bridgeattach: 338 * 339 * Pseudo-device attach routine. 340 */ 341 void 342 bridgeattach(int n) 343 { 344 345 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 346 0, 0, 0, "brtpl", NULL); 347 348 LIST_INIT(&bridge_list); 349 if_clone_attach(&bridge_cloner); 350 } 351 352 /* 353 * bridge_clone_create: 354 * 355 * Create a new bridge instance. 356 */ 357 static int 358 bridge_clone_create(struct if_clone *ifc, int unit) 359 { 360 struct bridge_softc *sc; 361 struct ifnet *ifp; 362 int s; 363 364 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK); 365 memset(sc, 0, sizeof(*sc)); 366 ifp = &sc->sc_if; 367 368 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 369 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 370 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 371 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 372 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 373 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 374 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 375 sc->sc_filter_flags = 0; 376 377 /* Initialize our routing table. */ 378 bridge_rtable_init(sc); 379 380 callout_init(&sc->sc_brcallout); 381 callout_init(&sc->sc_bstpcallout); 382 383 LIST_INIT(&sc->sc_iflist); 384 385 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", ifc->ifc_name, 386 unit); 387 ifp->if_softc = sc; 388 ifp->if_mtu = ETHERMTU; 389 ifp->if_ioctl = bridge_ioctl; 390 ifp->if_output = bridge_output; 391 ifp->if_start = bridge_start; 392 ifp->if_stop = bridge_stop; 393 ifp->if_init = bridge_init; 394 ifp->if_type = IFT_BRIDGE; 395 ifp->if_addrlen = 0; 396 ifp->if_dlt = DLT_EN10MB; 397 ifp->if_hdrlen = ETHER_HDR_LEN; 398 399 if_attach(ifp); 400 401 if_alloc_sadl(ifp); 402 403 s = splnet(); 404 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 405 splx(s); 406 407 return (0); 408 } 409 410 /* 411 * bridge_clone_destroy: 412 * 413 * Destroy a bridge instance. 414 */ 415 static int 416 bridge_clone_destroy(struct ifnet *ifp) 417 { 418 struct bridge_softc *sc = ifp->if_softc; 419 struct bridge_iflist *bif; 420 int s; 421 422 s = splnet(); 423 424 bridge_stop(ifp, 1); 425 426 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 427 bridge_delete_member(sc, bif); 428 429 LIST_REMOVE(sc, sc_list); 430 431 splx(s); 432 433 if_detach(ifp); 434 435 /* Tear down the routing table. */ 436 bridge_rtable_fini(sc); 437 438 free(sc, M_DEVBUF); 439 440 return (0); 441 } 442 443 /* 444 * bridge_ioctl: 445 * 446 * Handle a control request from the operator. 447 */ 448 static int 449 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 450 { 451 struct bridge_softc *sc = ifp->if_softc; 452 struct lwp *l = curlwp; /* XXX */ 453 union { 454 struct ifbreq ifbreq; 455 struct ifbifconf ifbifconf; 456 struct ifbareq ifbareq; 457 struct ifbaconf ifbaconf; 458 struct ifbrparam ifbrparam; 459 } args; 460 struct ifdrv *ifd = (struct ifdrv *) data; 461 const struct bridge_control *bc; 462 int s, error = 0; 463 464 s = splnet(); 465 466 switch (cmd) { 467 case SIOCGDRVSPEC: 468 case SIOCSDRVSPEC: 469 if (ifd->ifd_cmd >= bridge_control_table_size) { 470 error = EINVAL; 471 break; 472 } 473 bc = &bridge_control_table[ifd->ifd_cmd]; 474 475 if (cmd == SIOCGDRVSPEC && 476 (bc->bc_flags & BC_F_COPYOUT) == 0) { 477 error = EINVAL; 478 break; 479 } 480 else if (cmd == SIOCSDRVSPEC && 481 (bc->bc_flags & BC_F_COPYOUT) != 0) { 482 error = EINVAL; 483 break; 484 } 485 486 if (bc->bc_flags & BC_F_SUSER) { 487 error = kauth_authorize_generic(l->l_cred, 488 KAUTH_GENERIC_ISSUSER, NULL); 489 if (error) 490 break; 491 } 492 493 if (ifd->ifd_len != bc->bc_argsize || 494 ifd->ifd_len > sizeof(args)) { 495 error = EINVAL; 496 break; 497 } 498 499 memset(&args, 0, sizeof(args)); 500 if (bc->bc_flags & BC_F_COPYIN) { 501 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 502 if (error) 503 break; 504 } 505 506 error = (*bc->bc_func)(sc, &args); 507 if (error) 508 break; 509 510 if (bc->bc_flags & BC_F_COPYOUT) 511 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 512 513 break; 514 515 case SIOCSIFFLAGS: 516 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 517 /* 518 * If interface is marked down and it is running, 519 * then stop and disable it. 520 */ 521 (*ifp->if_stop)(ifp, 1); 522 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 523 /* 524 * If interface is marked up and it is stopped, then 525 * start it. 526 */ 527 error = (*ifp->if_init)(ifp); 528 } 529 break; 530 531 default: 532 error = ENOTTY; 533 break; 534 } 535 536 splx(s); 537 538 return (error); 539 } 540 541 /* 542 * bridge_lookup_member: 543 * 544 * Lookup a bridge member interface. Must be called at splnet(). 545 */ 546 static struct bridge_iflist * 547 bridge_lookup_member(struct bridge_softc *sc, const char *name) 548 { 549 struct bridge_iflist *bif; 550 struct ifnet *ifp; 551 552 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 553 ifp = bif->bif_ifp; 554 if (strcmp(ifp->if_xname, name) == 0) 555 return (bif); 556 } 557 558 return (NULL); 559 } 560 561 /* 562 * bridge_lookup_member_if: 563 * 564 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 565 */ 566 static struct bridge_iflist * 567 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 568 { 569 struct bridge_iflist *bif; 570 571 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 572 if (bif->bif_ifp == member_ifp) 573 return (bif); 574 } 575 576 return (NULL); 577 } 578 579 /* 580 * bridge_delete_member: 581 * 582 * Delete the specified member interface. 583 */ 584 static void 585 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 586 { 587 struct ifnet *ifs = bif->bif_ifp; 588 589 switch (ifs->if_type) { 590 case IFT_ETHER: 591 /* 592 * Take the interface out of promiscuous mode. 593 */ 594 (void) ifpromisc(ifs, 0); 595 break; 596 default: 597 #ifdef DIAGNOSTIC 598 panic("bridge_delete_member: impossible"); 599 #endif 600 break; 601 } 602 603 ifs->if_bridge = NULL; 604 LIST_REMOVE(bif, bif_next); 605 606 bridge_rtdelete(sc, ifs); 607 608 free(bif, M_DEVBUF); 609 610 if (sc->sc_if.if_flags & IFF_RUNNING) 611 bstp_initialization(sc); 612 } 613 614 static int 615 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 616 { 617 struct ifbreq *req = arg; 618 struct bridge_iflist *bif = NULL; 619 struct ifnet *ifs; 620 int error = 0; 621 622 ifs = ifunit(req->ifbr_ifsname); 623 if (ifs == NULL) 624 return (ENOENT); 625 626 if (sc->sc_if.if_mtu != ifs->if_mtu) 627 return (EINVAL); 628 629 if (ifs->if_bridge == sc) 630 return (EEXIST); 631 632 if (ifs->if_bridge != NULL) 633 return (EBUSY); 634 635 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 636 if (bif == NULL) 637 return (ENOMEM); 638 639 switch (ifs->if_type) { 640 case IFT_ETHER: 641 /* 642 * Place the interface into promiscuous mode. 643 */ 644 error = ifpromisc(ifs, 1); 645 if (error) 646 goto out; 647 break; 648 default: 649 error = EINVAL; 650 goto out; 651 } 652 653 bif->bif_ifp = ifs; 654 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 655 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 656 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 657 658 ifs->if_bridge = sc; 659 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 660 661 if (sc->sc_if.if_flags & IFF_RUNNING) 662 bstp_initialization(sc); 663 else 664 bstp_stop(sc); 665 666 out: 667 if (error) { 668 if (bif != NULL) 669 free(bif, M_DEVBUF); 670 } 671 return (error); 672 } 673 674 static int 675 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 676 { 677 struct ifbreq *req = arg; 678 struct bridge_iflist *bif; 679 680 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 681 if (bif == NULL) 682 return (ENOENT); 683 684 bridge_delete_member(sc, bif); 685 686 return (0); 687 } 688 689 static int 690 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 691 { 692 struct ifbreq *req = arg; 693 struct bridge_iflist *bif; 694 695 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 696 if (bif == NULL) 697 return (ENOENT); 698 699 req->ifbr_ifsflags = bif->bif_flags; 700 req->ifbr_state = bif->bif_state; 701 req->ifbr_priority = bif->bif_priority; 702 req->ifbr_path_cost = bif->bif_path_cost; 703 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 704 705 return (0); 706 } 707 708 static int 709 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 710 { 711 struct ifbreq *req = arg; 712 struct bridge_iflist *bif; 713 714 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 715 if (bif == NULL) 716 return (ENOENT); 717 718 if (req->ifbr_ifsflags & IFBIF_STP) { 719 switch (bif->bif_ifp->if_type) { 720 case IFT_ETHER: 721 /* These can do spanning tree. */ 722 break; 723 724 default: 725 /* Nothing else can. */ 726 return (EINVAL); 727 } 728 } 729 730 bif->bif_flags = req->ifbr_ifsflags; 731 732 if (sc->sc_if.if_flags & IFF_RUNNING) 733 bstp_initialization(sc); 734 735 return (0); 736 } 737 738 static int 739 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 740 { 741 struct ifbrparam *param = arg; 742 743 sc->sc_brtmax = param->ifbrp_csize; 744 bridge_rttrim(sc); 745 746 return (0); 747 } 748 749 static int 750 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 751 { 752 struct ifbrparam *param = arg; 753 754 param->ifbrp_csize = sc->sc_brtmax; 755 756 return (0); 757 } 758 759 static int 760 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 761 { 762 struct ifbifconf *bifc = arg; 763 struct bridge_iflist *bif; 764 struct ifbreq breq; 765 int count, len, error = 0; 766 767 count = 0; 768 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 769 count++; 770 771 if (bifc->ifbic_len == 0) { 772 bifc->ifbic_len = sizeof(breq) * count; 773 return (0); 774 } 775 776 count = 0; 777 len = bifc->ifbic_len; 778 memset(&breq, 0, sizeof breq); 779 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 780 if (len < sizeof(breq)) 781 break; 782 783 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 784 sizeof(breq.ifbr_ifsname)); 785 breq.ifbr_ifsflags = bif->bif_flags; 786 breq.ifbr_state = bif->bif_state; 787 breq.ifbr_priority = bif->bif_priority; 788 breq.ifbr_path_cost = bif->bif_path_cost; 789 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 790 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 791 if (error) 792 break; 793 count++; 794 len -= sizeof(breq); 795 } 796 797 bifc->ifbic_len = sizeof(breq) * count; 798 return (error); 799 } 800 801 static int 802 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 803 { 804 struct ifbaconf *bac = arg; 805 struct bridge_rtnode *brt; 806 struct ifbareq bareq; 807 int count = 0, error = 0, len; 808 809 if (bac->ifbac_len == 0) 810 return (0); 811 812 len = bac->ifbac_len; 813 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 814 if (len < sizeof(bareq)) 815 goto out; 816 memset(&bareq, 0, sizeof(bareq)); 817 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 818 sizeof(bareq.ifba_ifsname)); 819 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 820 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 821 bareq.ifba_expire = brt->brt_expire - time_uptime; 822 } else 823 bareq.ifba_expire = 0; 824 bareq.ifba_flags = brt->brt_flags; 825 826 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 827 if (error) 828 goto out; 829 count++; 830 len -= sizeof(bareq); 831 } 832 out: 833 bac->ifbac_len = sizeof(bareq) * count; 834 return (error); 835 } 836 837 static int 838 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 839 { 840 struct ifbareq *req = arg; 841 struct bridge_iflist *bif; 842 int error; 843 844 bif = bridge_lookup_member(sc, req->ifba_ifsname); 845 if (bif == NULL) 846 return (ENOENT); 847 848 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 849 req->ifba_flags); 850 851 return (error); 852 } 853 854 static int 855 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 856 { 857 struct ifbrparam *param = arg; 858 859 sc->sc_brttimeout = param->ifbrp_ctime; 860 861 return (0); 862 } 863 864 static int 865 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 866 { 867 struct ifbrparam *param = arg; 868 869 param->ifbrp_ctime = sc->sc_brttimeout; 870 871 return (0); 872 } 873 874 static int 875 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 876 { 877 struct ifbareq *req = arg; 878 879 return (bridge_rtdaddr(sc, req->ifba_dst)); 880 } 881 882 static int 883 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 884 { 885 struct ifbreq *req = arg; 886 887 bridge_rtflush(sc, req->ifbr_ifsflags); 888 889 return (0); 890 } 891 892 static int 893 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 894 { 895 struct ifbrparam *param = arg; 896 897 param->ifbrp_prio = sc->sc_bridge_priority; 898 899 return (0); 900 } 901 902 static int 903 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 904 { 905 struct ifbrparam *param = arg; 906 907 sc->sc_bridge_priority = param->ifbrp_prio; 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_ght(struct bridge_softc *sc, void *arg) 917 { 918 struct ifbrparam *param = arg; 919 920 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 921 922 return (0); 923 } 924 925 static int 926 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 927 { 928 struct ifbrparam *param = arg; 929 930 if (param->ifbrp_hellotime == 0) 931 return (EINVAL); 932 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 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_gfd(struct bridge_softc *sc, void *arg) 942 { 943 struct ifbrparam *param = arg; 944 945 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 946 947 return (0); 948 } 949 950 static int 951 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 952 { 953 struct ifbrparam *param = arg; 954 955 if (param->ifbrp_fwddelay == 0) 956 return (EINVAL); 957 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 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_gma(struct bridge_softc *sc, void *arg) 967 { 968 struct ifbrparam *param = arg; 969 970 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 971 972 return (0); 973 } 974 975 static int 976 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 977 { 978 struct ifbrparam *param = arg; 979 980 if (param->ifbrp_maxage == 0) 981 return (EINVAL); 982 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 983 984 if (sc->sc_if.if_flags & IFF_RUNNING) 985 bstp_initialization(sc); 986 987 return (0); 988 } 989 990 static int 991 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 992 { 993 struct ifbreq *req = arg; 994 struct bridge_iflist *bif; 995 996 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 997 if (bif == NULL) 998 return (ENOENT); 999 1000 bif->bif_priority = req->ifbr_priority; 1001 1002 if (sc->sc_if.if_flags & IFF_RUNNING) 1003 bstp_initialization(sc); 1004 1005 return (0); 1006 } 1007 1008 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1009 static int 1010 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1011 { 1012 struct ifbrparam *param = arg; 1013 1014 param->ifbrp_filter = sc->sc_filter_flags; 1015 1016 return (0); 1017 } 1018 1019 static int 1020 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1021 { 1022 struct ifbrparam *param = arg; 1023 uint32_t nflags, oflags; 1024 1025 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1026 return (EINVAL); 1027 1028 nflags = param->ifbrp_filter; 1029 oflags = sc->sc_filter_flags; 1030 1031 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1032 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1033 &sc->sc_if.if_pfil); 1034 } 1035 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1036 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1037 &sc->sc_if.if_pfil); 1038 } 1039 1040 sc->sc_filter_flags = nflags; 1041 1042 return (0); 1043 } 1044 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1045 1046 static int 1047 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1048 { 1049 struct ifbreq *req = arg; 1050 struct bridge_iflist *bif; 1051 1052 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1053 if (bif == NULL) 1054 return (ENOENT); 1055 1056 bif->bif_path_cost = req->ifbr_path_cost; 1057 1058 if (sc->sc_if.if_flags & IFF_RUNNING) 1059 bstp_initialization(sc); 1060 1061 return (0); 1062 } 1063 1064 /* 1065 * bridge_ifdetach: 1066 * 1067 * Detach an interface from a bridge. Called when a member 1068 * interface is detaching. 1069 */ 1070 void 1071 bridge_ifdetach(struct ifnet *ifp) 1072 { 1073 struct bridge_softc *sc = ifp->if_bridge; 1074 struct ifbreq breq; 1075 1076 memset(&breq, 0, sizeof(breq)); 1077 snprintf(breq.ifbr_ifsname, sizeof(breq.ifbr_ifsname), ifp->if_xname); 1078 1079 (void) bridge_ioctl_del(sc, &breq); 1080 } 1081 1082 /* 1083 * bridge_init: 1084 * 1085 * Initialize a bridge interface. 1086 */ 1087 static int 1088 bridge_init(struct ifnet *ifp) 1089 { 1090 struct bridge_softc *sc = ifp->if_softc; 1091 1092 if (ifp->if_flags & IFF_RUNNING) 1093 return (0); 1094 1095 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1096 bridge_timer, sc); 1097 1098 ifp->if_flags |= IFF_RUNNING; 1099 bstp_initialization(sc); 1100 return (0); 1101 } 1102 1103 /* 1104 * bridge_stop: 1105 * 1106 * Stop the bridge interface. 1107 */ 1108 static void 1109 bridge_stop(struct ifnet *ifp, int disable) 1110 { 1111 struct bridge_softc *sc = ifp->if_softc; 1112 1113 if ((ifp->if_flags & IFF_RUNNING) == 0) 1114 return; 1115 1116 callout_stop(&sc->sc_brcallout); 1117 bstp_stop(sc); 1118 1119 IF_PURGE(&ifp->if_snd); 1120 1121 bridge_rtflush(sc, IFBF_FLUSHDYN); 1122 1123 ifp->if_flags &= ~IFF_RUNNING; 1124 } 1125 1126 /* 1127 * bridge_enqueue: 1128 * 1129 * Enqueue a packet on a bridge member interface. 1130 * 1131 * NOTE: must be called at splnet(). 1132 */ 1133 void 1134 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1135 int runfilt) 1136 { 1137 ALTQ_DECL(struct altq_pktattr pktattr;) 1138 int len, error; 1139 short mflags; 1140 1141 /* 1142 * Clear any in-bound checksum flags for this packet. 1143 */ 1144 m->m_pkthdr.csum_flags = 0; 1145 1146 #ifdef PFIL_HOOKS 1147 if (runfilt) { 1148 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1149 dst_ifp, PFIL_OUT) != 0) { 1150 if (m != NULL) 1151 m_freem(m); 1152 return; 1153 } 1154 if (m == NULL) 1155 return; 1156 } 1157 #endif /* PFIL_HOOKS */ 1158 1159 #ifdef ALTQ 1160 /* 1161 * If ALTQ is enabled on the member interface, do 1162 * classification; the queueing discipline might 1163 * not require classification, but might require 1164 * the address family/header pointer in the pktattr. 1165 */ 1166 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1167 /* XXX IFT_ETHER */ 1168 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1169 } 1170 #endif /* ALTQ */ 1171 1172 len = m->m_pkthdr.len; 1173 m->m_flags |= M_PROTO1; 1174 mflags = m->m_flags; 1175 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1176 if (error) { 1177 /* mbuf is already freed */ 1178 sc->sc_if.if_oerrors++; 1179 return; 1180 } 1181 1182 sc->sc_if.if_opackets++; 1183 sc->sc_if.if_obytes += len; 1184 1185 dst_ifp->if_obytes += len; 1186 1187 if (mflags & M_MCAST) { 1188 sc->sc_if.if_omcasts++; 1189 dst_ifp->if_omcasts++; 1190 } 1191 1192 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1193 (*dst_ifp->if_start)(dst_ifp); 1194 } 1195 1196 /* 1197 * bridge_output: 1198 * 1199 * Send output from a bridge member interface. This 1200 * performs the bridging function for locally originated 1201 * packets. 1202 * 1203 * The mbuf has the Ethernet header already attached. We must 1204 * enqueue or free the mbuf before returning. 1205 */ 1206 int 1207 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1208 struct rtentry *rt) 1209 { 1210 struct ether_header *eh; 1211 struct ifnet *dst_if; 1212 struct bridge_softc *sc; 1213 int s; 1214 1215 if (m->m_len < ETHER_HDR_LEN) { 1216 m = m_pullup(m, ETHER_HDR_LEN); 1217 if (m == NULL) 1218 return (0); 1219 } 1220 1221 eh = mtod(m, struct ether_header *); 1222 sc = ifp->if_bridge; 1223 1224 s = splnet(); 1225 1226 /* 1227 * If bridge is down, but the original output interface is up, 1228 * go ahead and send out that interface. Otherwise, the packet 1229 * is dropped below. 1230 */ 1231 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1232 dst_if = ifp; 1233 goto sendunicast; 1234 } 1235 1236 /* 1237 * If the packet is a multicast, or we don't know a better way to 1238 * get there, send to all interfaces. 1239 */ 1240 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1241 dst_if = NULL; 1242 else 1243 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1244 if (dst_if == NULL) { 1245 struct bridge_iflist *bif; 1246 struct mbuf *mc; 1247 int used = 0; 1248 1249 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1250 dst_if = bif->bif_ifp; 1251 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1252 continue; 1253 1254 /* 1255 * If this is not the original output interface, 1256 * and the interface is participating in spanning 1257 * tree, make sure the port is in a state that 1258 * allows forwarding. 1259 */ 1260 if (dst_if != ifp && 1261 (bif->bif_flags & IFBIF_STP) != 0) { 1262 switch (bif->bif_state) { 1263 case BSTP_IFSTATE_BLOCKING: 1264 case BSTP_IFSTATE_LISTENING: 1265 case BSTP_IFSTATE_DISABLED: 1266 continue; 1267 } 1268 } 1269 1270 if (LIST_NEXT(bif, bif_next) == NULL) { 1271 used = 1; 1272 mc = m; 1273 } else { 1274 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1275 if (mc == NULL) { 1276 sc->sc_if.if_oerrors++; 1277 continue; 1278 } 1279 } 1280 1281 bridge_enqueue(sc, dst_if, mc, 0); 1282 } 1283 if (used == 0) 1284 m_freem(m); 1285 splx(s); 1286 return (0); 1287 } 1288 1289 sendunicast: 1290 /* 1291 * XXX Spanning tree consideration here? 1292 */ 1293 1294 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1295 m_freem(m); 1296 splx(s); 1297 return (0); 1298 } 1299 1300 bridge_enqueue(sc, dst_if, m, 0); 1301 1302 splx(s); 1303 return (0); 1304 } 1305 1306 /* 1307 * bridge_start: 1308 * 1309 * Start output on a bridge. 1310 * 1311 * NOTE: This routine should never be called in this implementation. 1312 */ 1313 static void 1314 bridge_start(struct ifnet *ifp) 1315 { 1316 1317 printf("%s: bridge_start() called\n", ifp->if_xname); 1318 } 1319 1320 /* 1321 * bridge_forward: 1322 * 1323 * The forwarding function of the bridge. 1324 */ 1325 static void 1326 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1327 { 1328 struct bridge_iflist *bif; 1329 struct ifnet *src_if, *dst_if; 1330 struct ether_header *eh; 1331 1332 src_if = m->m_pkthdr.rcvif; 1333 1334 sc->sc_if.if_ipackets++; 1335 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1336 1337 /* 1338 * Look up the bridge_iflist. 1339 */ 1340 bif = bridge_lookup_member_if(sc, src_if); 1341 if (bif == NULL) { 1342 /* Interface is not a bridge member (anymore?) */ 1343 m_freem(m); 1344 return; 1345 } 1346 1347 if (bif->bif_flags & IFBIF_STP) { 1348 switch (bif->bif_state) { 1349 case BSTP_IFSTATE_BLOCKING: 1350 case BSTP_IFSTATE_LISTENING: 1351 case BSTP_IFSTATE_DISABLED: 1352 m_freem(m); 1353 return; 1354 } 1355 } 1356 1357 eh = mtod(m, struct ether_header *); 1358 1359 /* 1360 * If the interface is learning, and the source 1361 * address is valid and not multicast, record 1362 * the address. 1363 */ 1364 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1365 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1366 (eh->ether_shost[0] == 0 && 1367 eh->ether_shost[1] == 0 && 1368 eh->ether_shost[2] == 0 && 1369 eh->ether_shost[3] == 0 && 1370 eh->ether_shost[4] == 0 && 1371 eh->ether_shost[5] == 0) == 0) { 1372 (void) bridge_rtupdate(sc, eh->ether_shost, 1373 src_if, 0, IFBAF_DYNAMIC); 1374 } 1375 1376 if ((bif->bif_flags & IFBIF_STP) != 0 && 1377 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1378 m_freem(m); 1379 return; 1380 } 1381 1382 /* 1383 * At this point, the port either doesn't participate 1384 * in spanning tree or it is in the forwarding state. 1385 */ 1386 1387 /* 1388 * If the packet is unicast, destined for someone on 1389 * "this" side of the bridge, drop it. 1390 */ 1391 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1392 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1393 if (src_if == dst_if) { 1394 m_freem(m); 1395 return; 1396 } 1397 } else { 1398 /* ...forward it to all interfaces. */ 1399 sc->sc_if.if_imcasts++; 1400 dst_if = NULL; 1401 } 1402 1403 #ifdef PFIL_HOOKS 1404 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1405 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1406 if (m != NULL) 1407 m_freem(m); 1408 return; 1409 } 1410 if (m == NULL) 1411 return; 1412 #endif /* PFIL_HOOKS */ 1413 1414 if (dst_if == NULL) { 1415 bridge_broadcast(sc, src_if, m); 1416 return; 1417 } 1418 1419 /* 1420 * At this point, we're dealing with a unicast frame 1421 * going to a different interface. 1422 */ 1423 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1424 m_freem(m); 1425 return; 1426 } 1427 bif = bridge_lookup_member_if(sc, dst_if); 1428 if (bif == NULL) { 1429 /* Not a member of the bridge (anymore?) */ 1430 m_freem(m); 1431 return; 1432 } 1433 1434 if (bif->bif_flags & IFBIF_STP) { 1435 switch (bif->bif_state) { 1436 case BSTP_IFSTATE_DISABLED: 1437 case BSTP_IFSTATE_BLOCKING: 1438 m_freem(m); 1439 return; 1440 } 1441 } 1442 1443 bridge_enqueue(sc, dst_if, m, 1); 1444 } 1445 1446 /* 1447 * bridge_input: 1448 * 1449 * Receive input from a member interface. Queue the packet for 1450 * bridging if it is not for us. 1451 */ 1452 struct mbuf * 1453 bridge_input(struct ifnet *ifp, struct mbuf *m) 1454 { 1455 struct bridge_softc *sc = ifp->if_bridge; 1456 struct bridge_iflist *bif; 1457 struct ether_header *eh; 1458 struct mbuf *mc; 1459 1460 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1461 return (m); 1462 1463 bif = bridge_lookup_member_if(sc, ifp); 1464 if (bif == NULL) 1465 return (m); 1466 1467 eh = mtod(m, struct ether_header *); 1468 1469 if (m->m_flags & (M_BCAST|M_MCAST)) { 1470 /* Tap off 802.1D packets; they do not get forwarded. */ 1471 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1472 ETHER_ADDR_LEN) == 0) { 1473 m = bstp_input(ifp, m); 1474 if (m == NULL) 1475 return (NULL); 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 * Make a deep copy of the packet and enqueue the copy 1489 * for bridge processing; return the original packet for 1490 * local processing. 1491 */ 1492 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1493 if (mc == NULL) 1494 return (m); 1495 1496 /* Perform the bridge forwarding function with the copy. */ 1497 bridge_forward(sc, mc); 1498 1499 /* Return the original packet for local processing. */ 1500 return (m); 1501 } 1502 1503 if (bif->bif_flags & IFBIF_STP) { 1504 switch (bif->bif_state) { 1505 case BSTP_IFSTATE_BLOCKING: 1506 case BSTP_IFSTATE_LISTENING: 1507 case BSTP_IFSTATE_DISABLED: 1508 return (m); 1509 } 1510 } 1511 1512 /* 1513 * Unicast. Make sure it's not for us. 1514 */ 1515 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1516 /* It is destined for us. */ 1517 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1518 ETHER_ADDR_LEN) == 0 1519 #if NCARP > 0 1520 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1521 eh, IFT_ETHER, 0) != NULL) 1522 #endif /* NCARP > 0 */ 1523 ) { 1524 if (bif->bif_flags & IFBIF_LEARNING) 1525 (void) bridge_rtupdate(sc, 1526 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1527 m->m_pkthdr.rcvif = bif->bif_ifp; 1528 return (m); 1529 } 1530 1531 /* We just received a packet that we sent out. */ 1532 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1533 ETHER_ADDR_LEN) == 0 1534 #if NCARP > 0 1535 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1536 eh, IFT_ETHER, 1) != NULL) 1537 #endif /* NCARP > 0 */ 1538 ) { 1539 m_freem(m); 1540 return (NULL); 1541 } 1542 } 1543 1544 /* Perform the bridge forwarding function. */ 1545 bridge_forward(sc, m); 1546 1547 return (NULL); 1548 } 1549 1550 /* 1551 * bridge_broadcast: 1552 * 1553 * Send a frame to all interfaces that are members of 1554 * the bridge, except for the one on which the packet 1555 * arrived. 1556 */ 1557 static void 1558 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1559 struct mbuf *m) 1560 { 1561 struct bridge_iflist *bif; 1562 struct mbuf *mc; 1563 struct ifnet *dst_if; 1564 int used = 0; 1565 1566 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1567 dst_if = bif->bif_ifp; 1568 if (dst_if == src_if) 1569 continue; 1570 1571 if (bif->bif_flags & IFBIF_STP) { 1572 switch (bif->bif_state) { 1573 case BSTP_IFSTATE_BLOCKING: 1574 case BSTP_IFSTATE_DISABLED: 1575 continue; 1576 } 1577 } 1578 1579 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1580 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1581 continue; 1582 1583 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1584 continue; 1585 1586 if (LIST_NEXT(bif, bif_next) == NULL) { 1587 mc = m; 1588 used = 1; 1589 } else { 1590 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1591 if (mc == NULL) { 1592 sc->sc_if.if_oerrors++; 1593 continue; 1594 } 1595 } 1596 1597 bridge_enqueue(sc, dst_if, mc, 1); 1598 } 1599 if (used == 0) 1600 m_freem(m); 1601 } 1602 1603 /* 1604 * bridge_rtupdate: 1605 * 1606 * Add a bridge routing entry. 1607 */ 1608 static int 1609 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1610 struct ifnet *dst_if, int setflags, uint8_t flags) 1611 { 1612 struct bridge_rtnode *brt; 1613 int error, s; 1614 1615 /* 1616 * A route for this destination might already exist. If so, 1617 * update it, otherwise create a new one. 1618 */ 1619 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1620 if (sc->sc_brtcnt >= sc->sc_brtmax) 1621 return (ENOSPC); 1622 1623 /* 1624 * Allocate a new bridge forwarding node, and 1625 * initialize the expiration time and Ethernet 1626 * address. 1627 */ 1628 s = splnet(); 1629 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1630 splx(s); 1631 if (brt == NULL) 1632 return (ENOMEM); 1633 1634 memset(brt, 0, sizeof(*brt)); 1635 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1636 brt->brt_flags = IFBAF_DYNAMIC; 1637 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1638 1639 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1640 s = splnet(); 1641 pool_put(&bridge_rtnode_pool, brt); 1642 splx(s); 1643 return (error); 1644 } 1645 } 1646 1647 brt->brt_ifp = dst_if; 1648 if (setflags) { 1649 brt->brt_flags = flags; 1650 if (flags & IFBAF_STATIC) 1651 brt->brt_expire = 0; 1652 else 1653 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1654 } 1655 1656 return (0); 1657 } 1658 1659 /* 1660 * bridge_rtlookup: 1661 * 1662 * Lookup the destination interface for an address. 1663 */ 1664 static struct ifnet * 1665 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1666 { 1667 struct bridge_rtnode *brt; 1668 1669 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1670 return (NULL); 1671 1672 return (brt->brt_ifp); 1673 } 1674 1675 /* 1676 * bridge_rttrim: 1677 * 1678 * Trim the routine table so that we have a number 1679 * of routing entries less than or equal to the 1680 * maximum number. 1681 */ 1682 static void 1683 bridge_rttrim(struct bridge_softc *sc) 1684 { 1685 struct bridge_rtnode *brt, *nbrt; 1686 1687 /* Make sure we actually need to do this. */ 1688 if (sc->sc_brtcnt <= sc->sc_brtmax) 1689 return; 1690 1691 /* Force an aging cycle; this might trim enough addresses. */ 1692 bridge_rtage(sc); 1693 if (sc->sc_brtcnt <= sc->sc_brtmax) 1694 return; 1695 1696 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1697 nbrt = LIST_NEXT(brt, brt_list); 1698 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1699 bridge_rtnode_destroy(sc, brt); 1700 if (sc->sc_brtcnt <= sc->sc_brtmax) 1701 return; 1702 } 1703 } 1704 } 1705 1706 /* 1707 * bridge_timer: 1708 * 1709 * Aging timer for the bridge. 1710 */ 1711 static void 1712 bridge_timer(void *arg) 1713 { 1714 struct bridge_softc *sc = arg; 1715 int s; 1716 1717 s = splnet(); 1718 bridge_rtage(sc); 1719 splx(s); 1720 1721 if (sc->sc_if.if_flags & IFF_RUNNING) 1722 callout_reset(&sc->sc_brcallout, 1723 bridge_rtable_prune_period * hz, bridge_timer, sc); 1724 } 1725 1726 /* 1727 * bridge_rtage: 1728 * 1729 * Perform an aging cycle. 1730 */ 1731 static void 1732 bridge_rtage(struct bridge_softc *sc) 1733 { 1734 struct bridge_rtnode *brt, *nbrt; 1735 1736 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1737 nbrt = LIST_NEXT(brt, brt_list); 1738 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1739 if (time_uptime >= brt->brt_expire) 1740 bridge_rtnode_destroy(sc, brt); 1741 } 1742 } 1743 } 1744 1745 /* 1746 * bridge_rtflush: 1747 * 1748 * Remove all dynamic addresses from the bridge. 1749 */ 1750 static void 1751 bridge_rtflush(struct bridge_softc *sc, int full) 1752 { 1753 struct bridge_rtnode *brt, *nbrt; 1754 1755 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1756 nbrt = LIST_NEXT(brt, brt_list); 1757 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1758 bridge_rtnode_destroy(sc, brt); 1759 } 1760 } 1761 1762 /* 1763 * bridge_rtdaddr: 1764 * 1765 * Remove an address from the table. 1766 */ 1767 static int 1768 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1769 { 1770 struct bridge_rtnode *brt; 1771 1772 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1773 return (ENOENT); 1774 1775 bridge_rtnode_destroy(sc, brt); 1776 return (0); 1777 } 1778 1779 /* 1780 * bridge_rtdelete: 1781 * 1782 * Delete routes to a speicifc member interface. 1783 */ 1784 static void 1785 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1786 { 1787 struct bridge_rtnode *brt, *nbrt; 1788 1789 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1790 nbrt = LIST_NEXT(brt, brt_list); 1791 if (brt->brt_ifp == ifp) 1792 bridge_rtnode_destroy(sc, brt); 1793 } 1794 } 1795 1796 /* 1797 * bridge_rtable_init: 1798 * 1799 * Initialize the route table for this bridge. 1800 */ 1801 static int 1802 bridge_rtable_init(struct bridge_softc *sc) 1803 { 1804 int i; 1805 1806 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1807 M_DEVBUF, M_NOWAIT); 1808 if (sc->sc_rthash == NULL) 1809 return (ENOMEM); 1810 1811 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1812 LIST_INIT(&sc->sc_rthash[i]); 1813 1814 sc->sc_rthash_key = arc4random(); 1815 1816 LIST_INIT(&sc->sc_rtlist); 1817 1818 return (0); 1819 } 1820 1821 /* 1822 * bridge_rtable_fini: 1823 * 1824 * Deconstruct the route table for this bridge. 1825 */ 1826 static void 1827 bridge_rtable_fini(struct bridge_softc *sc) 1828 { 1829 1830 free(sc->sc_rthash, M_DEVBUF); 1831 } 1832 1833 /* 1834 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1835 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1836 */ 1837 #define mix(a, b, c) \ 1838 do { \ 1839 a -= b; a -= c; a ^= (c >> 13); \ 1840 b -= c; b -= a; b ^= (a << 8); \ 1841 c -= a; c -= b; c ^= (b >> 13); \ 1842 a -= b; a -= c; a ^= (c >> 12); \ 1843 b -= c; b -= a; b ^= (a << 16); \ 1844 c -= a; c -= b; c ^= (b >> 5); \ 1845 a -= b; a -= c; a ^= (c >> 3); \ 1846 b -= c; b -= a; b ^= (a << 10); \ 1847 c -= a; c -= b; c ^= (b >> 15); \ 1848 } while (/*CONSTCOND*/0) 1849 1850 static inline uint32_t 1851 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1852 { 1853 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1854 1855 b += addr[5] << 8; 1856 b += addr[4]; 1857 a += addr[3] << 24; 1858 a += addr[2] << 16; 1859 a += addr[1] << 8; 1860 a += addr[0]; 1861 1862 mix(a, b, c); 1863 1864 return (c & BRIDGE_RTHASH_MASK); 1865 } 1866 1867 #undef mix 1868 1869 /* 1870 * bridge_rtnode_lookup: 1871 * 1872 * Look up a bridge route node for the specified destination. 1873 */ 1874 static struct bridge_rtnode * 1875 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1876 { 1877 struct bridge_rtnode *brt; 1878 uint32_t hash; 1879 int dir; 1880 1881 hash = bridge_rthash(sc, addr); 1882 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1883 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1884 if (dir == 0) 1885 return (brt); 1886 if (dir > 0) 1887 return (NULL); 1888 } 1889 1890 return (NULL); 1891 } 1892 1893 /* 1894 * bridge_rtnode_insert: 1895 * 1896 * Insert the specified bridge node into the route table. We 1897 * assume the entry is not already in the table. 1898 */ 1899 static int 1900 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1901 { 1902 struct bridge_rtnode *lbrt; 1903 uint32_t hash; 1904 int dir; 1905 1906 hash = bridge_rthash(sc, brt->brt_addr); 1907 1908 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1909 if (lbrt == NULL) { 1910 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1911 goto out; 1912 } 1913 1914 do { 1915 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1916 if (dir == 0) 1917 return (EEXIST); 1918 if (dir > 0) { 1919 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1920 goto out; 1921 } 1922 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1923 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1924 goto out; 1925 } 1926 lbrt = LIST_NEXT(lbrt, brt_hash); 1927 } while (lbrt != NULL); 1928 1929 #ifdef DIAGNOSTIC 1930 panic("bridge_rtnode_insert: impossible"); 1931 #endif 1932 1933 out: 1934 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1935 sc->sc_brtcnt++; 1936 1937 return (0); 1938 } 1939 1940 /* 1941 * bridge_rtnode_destroy: 1942 * 1943 * Destroy a bridge rtnode. 1944 */ 1945 static void 1946 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1947 { 1948 int s = splnet(); 1949 1950 LIST_REMOVE(brt, brt_hash); 1951 1952 LIST_REMOVE(brt, brt_list); 1953 sc->sc_brtcnt--; 1954 pool_put(&bridge_rtnode_pool, brt); 1955 1956 splx(s); 1957 } 1958 1959 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1960 extern struct pfil_head inet_pfil_hook; /* XXX */ 1961 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1962 1963 /* 1964 * Send bridge packets through IPF if they are one of the types IPF can deal 1965 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1966 * question.) 1967 */ 1968 static int 1969 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1970 { 1971 int snap, error; 1972 struct ether_header *eh1, eh2; 1973 struct llc llc1; 1974 u_int16_t ether_type; 1975 1976 snap = 0; 1977 error = -1; /* Default error if not error == 0 */ 1978 eh1 = mtod(*mp, struct ether_header *); 1979 ether_type = ntohs(eh1->ether_type); 1980 1981 /* 1982 * Check for SNAP/LLC. 1983 */ 1984 if (ether_type < ETHERMTU) { 1985 struct llc *llc2 = (struct llc *)(eh1 + 1); 1986 1987 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1988 llc2->llc_dsap == LLC_SNAP_LSAP && 1989 llc2->llc_ssap == LLC_SNAP_LSAP && 1990 llc2->llc_control == LLC_UI) { 1991 ether_type = htons(llc2->llc_un.type_snap.ether_type); 1992 snap = 1; 1993 } 1994 } 1995 1996 /* 1997 * If we're trying to filter bridge traffic, don't look at anything 1998 * other than IP and ARP traffic. If the filter doesn't understand 1999 * IPv6, don't allow IPv6 through the bridge either. This is lame 2000 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2001 * but of course we don't have an AppleTalk filter to begin with. 2002 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2003 * ARP traffic.) 2004 */ 2005 switch (ether_type) { 2006 case ETHERTYPE_ARP: 2007 case ETHERTYPE_REVARP: 2008 return 0; /* Automatically pass */ 2009 case ETHERTYPE_IP: 2010 # ifdef INET6 2011 case ETHERTYPE_IPV6: 2012 # endif /* INET6 */ 2013 break; 2014 default: 2015 goto bad; 2016 } 2017 2018 /* Strip off the Ethernet header and keep a copy. */ 2019 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2020 m_adj(*mp, ETHER_HDR_LEN); 2021 2022 /* Strip off snap header, if present */ 2023 if (snap) { 2024 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2025 m_adj(*mp, sizeof(struct llc)); 2026 } 2027 2028 /* 2029 * Check basic packet sanity and run IPF through pfil. 2030 */ 2031 switch (ether_type) 2032 { 2033 case ETHERTYPE_IP : 2034 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2035 if (error == 0) 2036 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2037 break; 2038 # ifdef INET6 2039 case ETHERTYPE_IPV6 : 2040 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2041 if (error == 0) 2042 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2043 break; 2044 # endif 2045 default : 2046 error = 0; 2047 break; 2048 } 2049 2050 if (*mp == NULL) 2051 return error; 2052 if (error != 0) 2053 goto bad; 2054 2055 error = -1; 2056 2057 /* 2058 * Finally, put everything back the way it was and return 2059 */ 2060 if (snap) { 2061 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2062 if (*mp == NULL) 2063 return error; 2064 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2065 } 2066 2067 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2068 if (*mp == NULL) 2069 return error; 2070 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2071 2072 return 0; 2073 2074 bad: 2075 m_freem(*mp); 2076 *mp = NULL; 2077 return error; 2078 } 2079 2080 /* 2081 * Perform basic checks on header size since 2082 * IPF assumes ip_input has already processed 2083 * it for it. Cut-and-pasted from ip_input.c. 2084 * Given how simple the IPv6 version is, 2085 * does the IPv4 version really need to be 2086 * this complicated? 2087 * 2088 * XXX Should we update ipstat here, or not? 2089 * XXX Right now we update ipstat but not 2090 * XXX csum_counter. 2091 */ 2092 static int 2093 bridge_ip_checkbasic(struct mbuf **mp) 2094 { 2095 struct mbuf *m = *mp; 2096 struct ip *ip; 2097 int len, hlen; 2098 2099 if (*mp == NULL) 2100 return -1; 2101 2102 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2103 if ((m = m_copyup(m, sizeof(struct ip), 2104 (max_linkhdr + 3) & ~3)) == NULL) { 2105 /* XXXJRT new stat, please */ 2106 ipstat.ips_toosmall++; 2107 goto bad; 2108 } 2109 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2110 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2111 ipstat.ips_toosmall++; 2112 goto bad; 2113 } 2114 } 2115 ip = mtod(m, struct ip *); 2116 if (ip == NULL) goto bad; 2117 2118 if (ip->ip_v != IPVERSION) { 2119 ipstat.ips_badvers++; 2120 goto bad; 2121 } 2122 hlen = ip->ip_hl << 2; 2123 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2124 ipstat.ips_badhlen++; 2125 goto bad; 2126 } 2127 if (hlen > m->m_len) { 2128 if ((m = m_pullup(m, hlen)) == 0) { 2129 ipstat.ips_badhlen++; 2130 goto bad; 2131 } 2132 ip = mtod(m, struct ip *); 2133 if (ip == NULL) goto bad; 2134 } 2135 2136 switch (m->m_pkthdr.csum_flags & 2137 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2138 M_CSUM_IPv4_BAD)) { 2139 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2140 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2141 goto bad; 2142 2143 case M_CSUM_IPv4: 2144 /* Checksum was okay. */ 2145 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2146 break; 2147 2148 default: 2149 /* Must compute it ourselves. */ 2150 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2151 if (in_cksum(m, hlen) != 0) 2152 goto bad; 2153 break; 2154 } 2155 2156 /* Retrieve the packet length. */ 2157 len = ntohs(ip->ip_len); 2158 2159 /* 2160 * Check for additional length bogosity 2161 */ 2162 if (len < hlen) { 2163 ipstat.ips_badlen++; 2164 goto bad; 2165 } 2166 2167 /* 2168 * Check that the amount of data in the buffers 2169 * is as at least much as the IP header would have us expect. 2170 * Drop packet if shorter than we expect. 2171 */ 2172 if (m->m_pkthdr.len < len) { 2173 ipstat.ips_tooshort++; 2174 goto bad; 2175 } 2176 2177 /* Checks out, proceed */ 2178 *mp = m; 2179 return 0; 2180 2181 bad: 2182 *mp = m; 2183 return -1; 2184 } 2185 2186 # ifdef INET6 2187 /* 2188 * Same as above, but for IPv6. 2189 * Cut-and-pasted from ip6_input.c. 2190 * XXX Should we update ip6stat, or not? 2191 */ 2192 static int 2193 bridge_ip6_checkbasic(struct mbuf **mp) 2194 { 2195 struct mbuf *m = *mp; 2196 struct ip6_hdr *ip6; 2197 2198 /* 2199 * If the IPv6 header is not aligned, slurp it up into a new 2200 * mbuf with space for link headers, in the event we forward 2201 * it. Otherwise, if it is aligned, make sure the entire base 2202 * IPv6 header is in the first mbuf of the chain. 2203 */ 2204 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2205 struct ifnet *inifp = m->m_pkthdr.rcvif; 2206 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2207 (max_linkhdr + 3) & ~3)) == NULL) { 2208 /* XXXJRT new stat, please */ 2209 ip6stat.ip6s_toosmall++; 2210 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2211 goto bad; 2212 } 2213 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2214 struct ifnet *inifp = m->m_pkthdr.rcvif; 2215 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2216 ip6stat.ip6s_toosmall++; 2217 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2218 goto bad; 2219 } 2220 } 2221 2222 ip6 = mtod(m, struct ip6_hdr *); 2223 2224 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2225 ip6stat.ip6s_badvers++; 2226 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2227 goto bad; 2228 } 2229 2230 /* Checks out, proceed */ 2231 *mp = m; 2232 return 0; 2233 2234 bad: 2235 *mp = m; 2236 return -1; 2237 } 2238 # endif /* INET6 */ 2239 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2240
Indexes created Mon Sep 22 13:09:51 GMT 2025