1 /* $NetBSD: if_bridge.c,v 1.17 2003/08/11 15:14:16 itojun 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 * - Add packet filter hooks. 82 */ 83 84 #include <sys/cdefs.h> 85 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.17 2003/08/11 15:14:16 itojun Exp $"); 86 87 #include "opt_bridge_ipf.h" 88 #include "opt_inet.h" 89 #include "opt_pfil_hooks.h" 90 #include "bpfilter.h" 91 92 #include <sys/param.h> 93 #include <sys/kernel.h> 94 #include <sys/mbuf.h> 95 #include <sys/queue.h> 96 #include <sys/socket.h> 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 102 #if NBPFILTER > 0 103 #include <net/bpf.h> 104 #endif 105 #include <net/if.h> 106 #include <net/if_dl.h> 107 #include <net/if_types.h> 108 #include <net/if_llc.h> 109 110 #include <net/if_ether.h> 111 #include <net/if_bridgevar.h> 112 113 #ifdef BRIDGE_IPF /* 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 */ 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 /* 134 * Maximum number of addresses to cache. 135 */ 136 #ifndef BRIDGE_RTABLE_MAX 137 #define BRIDGE_RTABLE_MAX 100 138 #endif 139 140 /* 141 * Spanning tree defaults. 142 */ 143 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 144 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 145 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 146 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 147 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 148 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 149 #define BSTP_DEFAULT_PATH_COST 55 150 151 /* 152 * Timeout (in seconds) for entries learned dynamically. 153 */ 154 #ifndef BRIDGE_RTABLE_TIMEOUT 155 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 156 #endif 157 158 /* 159 * Number of seconds between walks of the route list. 160 */ 161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 162 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 163 #endif 164 165 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 166 167 struct pool bridge_rtnode_pool; 168 169 void bridgeattach(int); 170 171 int bridge_clone_create(struct if_clone *, int); 172 void bridge_clone_destroy(struct ifnet *); 173 174 int bridge_ioctl(struct ifnet *, u_long, caddr_t); 175 int bridge_init(struct ifnet *); 176 void bridge_stop(struct ifnet *, int); 177 void bridge_start(struct ifnet *); 178 179 void bridge_forward(struct bridge_softc *, struct mbuf *m); 180 181 void bridge_timer(void *); 182 183 void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *); 184 185 int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 186 struct ifnet *, int, uint8_t); 187 struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 188 void bridge_rttrim(struct bridge_softc *); 189 void bridge_rtage(struct bridge_softc *); 190 void bridge_rtflush(struct bridge_softc *, int); 191 int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 192 void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 193 194 int bridge_rtable_init(struct bridge_softc *); 195 void bridge_rtable_fini(struct bridge_softc *); 196 197 struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 198 const uint8_t *); 199 int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); 200 void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); 201 202 struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 203 const char *name); 204 struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 205 struct ifnet *ifp); 206 void bridge_delete_member(struct bridge_softc *, struct bridge_iflist *); 207 208 int bridge_ioctl_add(struct bridge_softc *, void *); 209 int bridge_ioctl_del(struct bridge_softc *, void *); 210 int bridge_ioctl_gifflags(struct bridge_softc *, void *); 211 int bridge_ioctl_sifflags(struct bridge_softc *, void *); 212 int bridge_ioctl_scache(struct bridge_softc *, void *); 213 int bridge_ioctl_gcache(struct bridge_softc *, void *); 214 int bridge_ioctl_gifs(struct bridge_softc *, void *); 215 int bridge_ioctl_rts(struct bridge_softc *, void *); 216 int bridge_ioctl_saddr(struct bridge_softc *, void *); 217 int bridge_ioctl_sto(struct bridge_softc *, void *); 218 int bridge_ioctl_gto(struct bridge_softc *, void *); 219 int bridge_ioctl_daddr(struct bridge_softc *, void *); 220 int bridge_ioctl_flush(struct bridge_softc *, void *); 221 int bridge_ioctl_gpri(struct bridge_softc *, void *); 222 int bridge_ioctl_spri(struct bridge_softc *, void *); 223 int bridge_ioctl_ght(struct bridge_softc *, void *); 224 int bridge_ioctl_sht(struct bridge_softc *, void *); 225 int bridge_ioctl_gfd(struct bridge_softc *, void *); 226 int bridge_ioctl_sfd(struct bridge_softc *, void *); 227 int bridge_ioctl_gma(struct bridge_softc *, void *); 228 int bridge_ioctl_sma(struct bridge_softc *, void *); 229 int bridge_ioctl_sifprio(struct bridge_softc *, void *); 230 int bridge_ioctl_sifcost(struct bridge_softc *, void *); 231 #ifdef BRIDGE_IPF 232 int bridge_ioctl_gfilt(struct bridge_softc *, void *); 233 int bridge_ioctl_sfilt(struct bridge_softc *, void *); 234 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 235 static int bridge_ip_checkbasic(struct mbuf **mp); 236 # ifdef INET6 237 static int bridge_ip6_checkbasic(struct mbuf **mp); 238 # endif /* INET6 */ 239 #endif /* BRIDGE_IPF */ 240 241 struct bridge_control { 242 int (*bc_func)(struct bridge_softc *, void *); 243 int bc_argsize; 244 int bc_flags; 245 }; 246 247 #define BC_F_COPYIN 0x01 /* copy arguments in */ 248 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 249 #define BC_F_SUSER 0x04 /* do super-user check */ 250 251 const struct bridge_control bridge_control_table[] = { 252 { bridge_ioctl_add, sizeof(struct ifbreq), 253 BC_F_COPYIN|BC_F_SUSER }, 254 { bridge_ioctl_del, sizeof(struct ifbreq), 255 BC_F_COPYIN|BC_F_SUSER }, 256 257 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 258 BC_F_COPYIN|BC_F_COPYOUT }, 259 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 260 BC_F_COPYIN|BC_F_SUSER }, 261 262 { bridge_ioctl_scache, sizeof(struct ifbrparam), 263 BC_F_COPYIN|BC_F_SUSER }, 264 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 265 BC_F_COPYOUT }, 266 267 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 268 BC_F_COPYIN|BC_F_COPYOUT }, 269 { bridge_ioctl_rts, sizeof(struct ifbaconf), 270 BC_F_COPYIN|BC_F_COPYOUT }, 271 272 { bridge_ioctl_saddr, sizeof(struct ifbareq), 273 BC_F_COPYIN|BC_F_SUSER }, 274 275 { bridge_ioctl_sto, sizeof(struct ifbrparam), 276 BC_F_COPYIN|BC_F_SUSER }, 277 { bridge_ioctl_gto, sizeof(struct ifbrparam), 278 BC_F_COPYOUT }, 279 280 { bridge_ioctl_daddr, sizeof(struct ifbareq), 281 BC_F_COPYIN|BC_F_SUSER }, 282 283 { bridge_ioctl_flush, sizeof(struct ifbreq), 284 BC_F_COPYIN|BC_F_SUSER }, 285 286 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 287 BC_F_COPYOUT }, 288 { bridge_ioctl_spri, sizeof(struct ifbrparam), 289 BC_F_COPYIN|BC_F_SUSER }, 290 291 { bridge_ioctl_ght, sizeof(struct ifbrparam), 292 BC_F_COPYOUT }, 293 { bridge_ioctl_sht, sizeof(struct ifbrparam), 294 BC_F_COPYIN|BC_F_SUSER }, 295 296 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 297 BC_F_COPYOUT }, 298 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 299 BC_F_COPYIN|BC_F_SUSER }, 300 301 { bridge_ioctl_gma, sizeof(struct ifbrparam), 302 BC_F_COPYOUT }, 303 { bridge_ioctl_sma, sizeof(struct ifbrparam), 304 BC_F_COPYIN|BC_F_SUSER }, 305 306 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 307 BC_F_COPYIN|BC_F_SUSER }, 308 309 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 310 BC_F_COPYIN|BC_F_SUSER }, 311 #ifdef BRIDGE_IPF 312 { bridge_ioctl_gfilt, sizeof(struct ifbrparam), 313 BC_F_COPYOUT }, 314 { bridge_ioctl_sfilt, sizeof(struct ifbrparam), 315 BC_F_COPYIN|BC_F_SUSER }, 316 #endif /* BRIDGE_IPF */ 317 }; 318 const int bridge_control_table_size = 319 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 320 321 LIST_HEAD(, bridge_softc) bridge_list; 322 323 struct if_clone bridge_cloner = 324 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 325 326 /* 327 * bridgeattach: 328 * 329 * Pseudo-device attach routine. 330 */ 331 void 332 bridgeattach(int n) 333 { 334 335 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 336 0, 0, 0, "brtpl", NULL); 337 338 LIST_INIT(&bridge_list); 339 if_clone_attach(&bridge_cloner); 340 } 341 342 /* 343 * bridge_clone_create: 344 * 345 * Create a new bridge instance. 346 */ 347 int 348 bridge_clone_create(struct if_clone *ifc, int unit) 349 { 350 struct bridge_softc *sc; 351 struct ifnet *ifp; 352 int s; 353 354 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK); 355 memset(sc, 0, sizeof(*sc)); 356 ifp = &sc->sc_if; 357 358 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 359 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 360 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 361 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 362 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 363 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 364 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 365 sc->sc_filter_flags = 0; 366 367 /* Initialize our routing table. */ 368 bridge_rtable_init(sc); 369 370 callout_init(&sc->sc_brcallout); 371 callout_init(&sc->sc_bstpcallout); 372 373 LIST_INIT(&sc->sc_iflist); 374 375 sprintf(ifp->if_xname, "%s%d", ifc->ifc_name, unit); 376 ifp->if_softc = sc; 377 ifp->if_mtu = ETHERMTU; 378 ifp->if_ioctl = bridge_ioctl; 379 ifp->if_output = bridge_output; 380 ifp->if_start = bridge_start; 381 ifp->if_stop = bridge_stop; 382 ifp->if_init = bridge_init; 383 ifp->if_type = IFT_BRIDGE; 384 ifp->if_addrlen = 0; 385 ifp->if_dlt = DLT_EN10MB; 386 ifp->if_hdrlen = ETHER_HDR_LEN; 387 388 if_attach(ifp); 389 390 if_alloc_sadl(ifp); 391 392 s = splnet(); 393 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 394 splx(s); 395 396 return (0); 397 } 398 399 /* 400 * bridge_clone_destroy: 401 * 402 * Destroy a bridge instance. 403 */ 404 void 405 bridge_clone_destroy(struct ifnet *ifp) 406 { 407 struct bridge_softc *sc = ifp->if_softc; 408 struct bridge_iflist *bif; 409 int s; 410 411 s = splnet(); 412 413 bridge_stop(ifp, 1); 414 415 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 416 bridge_delete_member(sc, bif); 417 418 LIST_REMOVE(sc, sc_list); 419 420 splx(s); 421 422 if_detach(ifp); 423 424 /* Tear down the routing table. */ 425 bridge_rtable_fini(sc); 426 427 free(sc, M_DEVBUF); 428 } 429 430 /* 431 * bridge_ioctl: 432 * 433 * Handle a control request from the operator. 434 */ 435 int 436 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 437 { 438 struct bridge_softc *sc = ifp->if_softc; 439 struct proc *p = curproc; /* XXX */ 440 union { 441 struct ifbreq ifbreq; 442 struct ifbifconf ifbifconf; 443 struct ifbareq ifbareq; 444 struct ifbaconf ifbaconf; 445 struct ifbrparam ifbrparam; 446 } args; 447 struct ifdrv *ifd = (struct ifdrv *) data; 448 const struct bridge_control *bc; 449 int s, error = 0; 450 451 s = splnet(); 452 453 switch (cmd) { 454 case SIOCGDRVSPEC: 455 case SIOCSDRVSPEC: 456 if (ifd->ifd_cmd >= bridge_control_table_size) { 457 error = EINVAL; 458 break; 459 } 460 bc = &bridge_control_table[ifd->ifd_cmd]; 461 462 if (cmd == SIOCGDRVSPEC && 463 (bc->bc_flags & BC_F_COPYOUT) == 0) { 464 error = EINVAL; 465 break; 466 } 467 else if (cmd == SIOCSDRVSPEC && 468 (bc->bc_flags & BC_F_COPYOUT) != 0) { 469 error = EINVAL; 470 break; 471 } 472 473 if (bc->bc_flags & BC_F_SUSER) { 474 error = suser(p->p_ucred, &p->p_acflag); 475 if (error) 476 break; 477 } 478 479 if (ifd->ifd_len != bc->bc_argsize || 480 ifd->ifd_len > sizeof(args)) { 481 error = EINVAL; 482 break; 483 } 484 485 if (bc->bc_flags & BC_F_COPYIN) { 486 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 487 if (error) 488 break; 489 } 490 491 error = (*bc->bc_func)(sc, &args); 492 if (error) 493 break; 494 495 if (bc->bc_flags & BC_F_COPYOUT) 496 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 497 498 break; 499 500 case SIOCSIFFLAGS: 501 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 502 /* 503 * If interface is marked down and it is running, 504 * then stop and disable it. 505 */ 506 (*ifp->if_stop)(ifp, 1); 507 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 508 /* 509 * If interface is marked up and it is stopped, then 510 * start it. 511 */ 512 error = (*ifp->if_init)(ifp); 513 } 514 break; 515 516 default: 517 error = ENOTTY; 518 break; 519 } 520 521 splx(s); 522 523 return (error); 524 } 525 526 /* 527 * bridge_lookup_member: 528 * 529 * Lookup a bridge member interface. Must be called at splnet(). 530 */ 531 struct bridge_iflist * 532 bridge_lookup_member(struct bridge_softc *sc, const char *name) 533 { 534 struct bridge_iflist *bif; 535 struct ifnet *ifp; 536 537 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 538 ifp = bif->bif_ifp; 539 if (strcmp(ifp->if_xname, name) == 0) 540 return (bif); 541 } 542 543 return (NULL); 544 } 545 546 /* 547 * bridge_lookup_member_if: 548 * 549 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 550 */ 551 struct bridge_iflist * 552 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 553 { 554 struct bridge_iflist *bif; 555 556 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 557 if (bif->bif_ifp == member_ifp) 558 return (bif); 559 } 560 561 return (NULL); 562 } 563 564 /* 565 * bridge_delete_member: 566 * 567 * Delete the specified member interface. 568 */ 569 void 570 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 571 { 572 struct ifnet *ifs = bif->bif_ifp; 573 574 switch (ifs->if_type) { 575 case IFT_ETHER: 576 /* 577 * Take the interface out of promiscuous mode. 578 */ 579 (void) ifpromisc(ifs, 0); 580 break; 581 582 default: 583 #ifdef DIAGNOSTIC 584 panic("bridge_delete_member: impossible"); 585 #endif 586 break; 587 } 588 589 ifs->if_bridge = NULL; 590 LIST_REMOVE(bif, bif_next); 591 592 bridge_rtdelete(sc, ifs); 593 594 free(bif, M_DEVBUF); 595 596 if (sc->sc_if.if_flags & IFF_RUNNING) 597 bstp_initialization(sc); 598 } 599 600 int 601 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 602 { 603 struct ifbreq *req = arg; 604 struct bridge_iflist *bif = NULL; 605 struct ifnet *ifs; 606 int error = 0; 607 608 ifs = ifunit(req->ifbr_ifsname); 609 if (ifs == NULL) 610 return (ENOENT); 611 612 if (sc->sc_if.if_mtu != ifs->if_mtu) 613 return (EINVAL); 614 615 if (ifs->if_bridge == sc) 616 return (EEXIST); 617 618 if (ifs->if_bridge != NULL) 619 return (EBUSY); 620 621 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 622 if (bif == NULL) 623 return (ENOMEM); 624 625 switch (ifs->if_type) { 626 case IFT_ETHER: 627 /* 628 * Place the interface into promiscuous mode. 629 */ 630 error = ifpromisc(ifs, 1); 631 if (error) 632 goto out; 633 break; 634 635 default: 636 error = EINVAL; 637 goto out; 638 } 639 640 bif->bif_ifp = ifs; 641 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 642 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 643 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 644 645 ifs->if_bridge = sc; 646 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 647 648 if (sc->sc_if.if_flags & IFF_RUNNING) 649 bstp_initialization(sc); 650 else 651 bstp_stop(sc); 652 653 out: 654 if (error) { 655 if (bif != NULL) 656 free(bif, M_DEVBUF); 657 } 658 return (error); 659 } 660 661 int 662 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 663 { 664 struct ifbreq *req = arg; 665 struct bridge_iflist *bif; 666 667 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 668 if (bif == NULL) 669 return (ENOENT); 670 671 bridge_delete_member(sc, bif); 672 673 return (0); 674 } 675 676 int 677 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 678 { 679 struct ifbreq *req = arg; 680 struct bridge_iflist *bif; 681 682 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 683 if (bif == NULL) 684 return (ENOENT); 685 686 req->ifbr_ifsflags = bif->bif_flags; 687 req->ifbr_state = bif->bif_state; 688 req->ifbr_priority = bif->bif_priority; 689 req->ifbr_path_cost = bif->bif_path_cost; 690 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 691 692 return (0); 693 } 694 695 int 696 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 697 { 698 struct ifbreq *req = arg; 699 struct bridge_iflist *bif; 700 701 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 702 if (bif == NULL) 703 return (ENOENT); 704 705 if (req->ifbr_ifsflags & IFBIF_STP) { 706 switch (bif->bif_ifp->if_type) { 707 case IFT_ETHER: 708 /* These can do spanning tree. */ 709 break; 710 711 default: 712 /* Nothing else can. */ 713 return (EINVAL); 714 } 715 } 716 717 bif->bif_flags = req->ifbr_ifsflags; 718 719 if (sc->sc_if.if_flags & IFF_RUNNING) 720 bstp_initialization(sc); 721 722 return (0); 723 } 724 725 int 726 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 727 { 728 struct ifbrparam *param = arg; 729 730 sc->sc_brtmax = param->ifbrp_csize; 731 bridge_rttrim(sc); 732 733 return (0); 734 } 735 736 int 737 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 738 { 739 struct ifbrparam *param = arg; 740 741 param->ifbrp_csize = sc->sc_brtmax; 742 743 return (0); 744 } 745 746 int 747 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 748 { 749 struct ifbifconf *bifc = arg; 750 struct bridge_iflist *bif; 751 struct ifbreq breq; 752 int count, len, error = 0; 753 754 count = 0; 755 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 756 count++; 757 758 if (bifc->ifbic_len == 0) { 759 bifc->ifbic_len = sizeof(breq) * count; 760 return (0); 761 } 762 763 count = 0; 764 len = bifc->ifbic_len; 765 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 766 if (len < sizeof(breq)) 767 break; 768 769 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 770 sizeof(breq.ifbr_ifsname)); 771 breq.ifbr_ifsflags = bif->bif_flags; 772 breq.ifbr_state = bif->bif_state; 773 breq.ifbr_priority = bif->bif_priority; 774 breq.ifbr_path_cost = bif->bif_path_cost; 775 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 776 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 777 if (error) 778 break; 779 count++; 780 len -= sizeof(breq); 781 } 782 783 bifc->ifbic_len = sizeof(breq) * count; 784 return (error); 785 } 786 787 int 788 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 789 { 790 struct ifbaconf *bac = arg; 791 struct bridge_rtnode *brt; 792 struct ifbareq bareq; 793 int count = 0, error = 0, len; 794 795 if (bac->ifbac_len == 0) 796 return (0); 797 798 len = bac->ifbac_len; 799 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 800 if (len < sizeof(bareq)) 801 goto out; 802 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 803 sizeof(bareq.ifba_ifsname)); 804 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 805 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 806 bareq.ifba_expire = brt->brt_expire - mono_time.tv_sec; 807 else 808 bareq.ifba_expire = 0; 809 bareq.ifba_flags = brt->brt_flags; 810 811 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 812 if (error) 813 goto out; 814 count++; 815 len -= sizeof(bareq); 816 } 817 out: 818 bac->ifbac_len = sizeof(bareq) * count; 819 return (error); 820 } 821 822 int 823 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 824 { 825 struct ifbareq *req = arg; 826 struct bridge_iflist *bif; 827 int error; 828 829 bif = bridge_lookup_member(sc, req->ifba_ifsname); 830 if (bif == NULL) 831 return (ENOENT); 832 833 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 834 req->ifba_flags); 835 836 return (error); 837 } 838 839 int 840 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 841 { 842 struct ifbrparam *param = arg; 843 844 sc->sc_brttimeout = param->ifbrp_ctime; 845 846 return (0); 847 } 848 849 int 850 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 851 { 852 struct ifbrparam *param = arg; 853 854 param->ifbrp_ctime = sc->sc_brttimeout; 855 856 return (0); 857 } 858 859 int 860 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 861 { 862 struct ifbareq *req = arg; 863 864 return (bridge_rtdaddr(sc, req->ifba_dst)); 865 } 866 867 int 868 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 869 { 870 struct ifbreq *req = arg; 871 872 bridge_rtflush(sc, req->ifbr_ifsflags); 873 874 return (0); 875 } 876 877 int 878 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 879 { 880 struct ifbrparam *param = arg; 881 882 param->ifbrp_prio = sc->sc_bridge_priority; 883 884 return (0); 885 } 886 887 int 888 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 889 { 890 struct ifbrparam *param = arg; 891 892 sc->sc_bridge_priority = param->ifbrp_prio; 893 894 if (sc->sc_if.if_flags & IFF_RUNNING) 895 bstp_initialization(sc); 896 897 return (0); 898 } 899 900 int 901 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 902 { 903 struct ifbrparam *param = arg; 904 905 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 906 907 return (0); 908 } 909 910 int 911 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 912 { 913 struct ifbrparam *param = arg; 914 915 if (param->ifbrp_hellotime == 0) 916 return (EINVAL); 917 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 918 919 if (sc->sc_if.if_flags & IFF_RUNNING) 920 bstp_initialization(sc); 921 922 return (0); 923 } 924 925 int 926 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 927 { 928 struct ifbrparam *param = arg; 929 930 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 931 932 return (0); 933 } 934 935 int 936 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 937 { 938 struct ifbrparam *param = arg; 939 940 if (param->ifbrp_fwddelay == 0) 941 return (EINVAL); 942 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 943 944 if (sc->sc_if.if_flags & IFF_RUNNING) 945 bstp_initialization(sc); 946 947 return (0); 948 } 949 950 int 951 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 952 { 953 struct ifbrparam *param = arg; 954 955 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 956 957 return (0); 958 } 959 960 int 961 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 962 { 963 struct ifbrparam *param = arg; 964 965 if (param->ifbrp_maxage == 0) 966 return (EINVAL); 967 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 968 969 if (sc->sc_if.if_flags & IFF_RUNNING) 970 bstp_initialization(sc); 971 972 return (0); 973 } 974 975 int 976 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 977 { 978 struct ifbreq *req = arg; 979 struct bridge_iflist *bif; 980 981 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 982 if (bif == NULL) 983 return (ENOENT); 984 985 bif->bif_priority = req->ifbr_priority; 986 987 if (sc->sc_if.if_flags & IFF_RUNNING) 988 bstp_initialization(sc); 989 990 return (0); 991 } 992 993 #ifdef BRIDGE_IPF 994 int 995 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 996 { 997 struct ifbrparam *param = arg; 998 999 param->ifbrp_filter = sc->sc_filter_flags; 1000 1001 return (0); 1002 } 1003 1004 int 1005 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1006 { 1007 struct ifbrparam *param = arg; 1008 uint32_t nflags, oflags; 1009 1010 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1011 return (EINVAL); 1012 1013 nflags = param->ifbrp_filter; 1014 oflags = sc->sc_filter_flags; 1015 1016 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1017 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1018 &sc->sc_if.if_pfil); 1019 } 1020 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1021 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1022 &sc->sc_if.if_pfil); 1023 } 1024 1025 sc->sc_filter_flags = nflags; 1026 1027 return (0); 1028 } 1029 #endif /* BRIDGE_IPF */ 1030 1031 int 1032 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1033 { 1034 struct ifbreq *req = arg; 1035 struct bridge_iflist *bif; 1036 1037 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1038 if (bif == NULL) 1039 return (ENOENT); 1040 1041 bif->bif_path_cost = req->ifbr_path_cost; 1042 1043 if (sc->sc_if.if_flags & IFF_RUNNING) 1044 bstp_initialization(sc); 1045 1046 return (0); 1047 } 1048 1049 /* 1050 * bridge_ifdetach: 1051 * 1052 * Detach an interface from a bridge. Called when a member 1053 * interface is detaching. 1054 */ 1055 void 1056 bridge_ifdetach(struct ifnet *ifp) 1057 { 1058 struct bridge_softc *sc = ifp->if_bridge; 1059 struct ifbreq breq; 1060 1061 memset(&breq, 0, sizeof(breq)); 1062 sprintf(breq.ifbr_ifsname, ifp->if_xname); 1063 1064 (void) bridge_ioctl_del(sc, &breq); 1065 } 1066 1067 /* 1068 * bridge_init: 1069 * 1070 * Initialize a bridge interface. 1071 */ 1072 int 1073 bridge_init(struct ifnet *ifp) 1074 { 1075 struct bridge_softc *sc = ifp->if_softc; 1076 1077 if (ifp->if_flags & IFF_RUNNING) 1078 return (0); 1079 1080 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1081 bridge_timer, sc); 1082 1083 ifp->if_flags |= IFF_RUNNING; 1084 bstp_initialization(sc); 1085 return (0); 1086 } 1087 1088 /* 1089 * bridge_stop: 1090 * 1091 * Stop the bridge interface. 1092 */ 1093 void 1094 bridge_stop(struct ifnet *ifp, int disable) 1095 { 1096 struct bridge_softc *sc = ifp->if_softc; 1097 1098 if ((ifp->if_flags & IFF_RUNNING) == 0) 1099 return; 1100 1101 callout_stop(&sc->sc_brcallout); 1102 bstp_stop(sc); 1103 1104 IF_PURGE(&ifp->if_snd); 1105 1106 bridge_rtflush(sc, IFBF_FLUSHDYN); 1107 1108 ifp->if_flags &= ~IFF_RUNNING; 1109 } 1110 1111 /* 1112 * bridge_enqueue: 1113 * 1114 * Enqueue a packet on a bridge member interface. 1115 * 1116 * NOTE: must be called at splnet(). 1117 */ 1118 __inline void 1119 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1120 { 1121 ALTQ_DECL(struct altq_pktattr pktattr;) 1122 int len, error; 1123 short mflags; 1124 1125 #ifdef PFIL_HOOKS 1126 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, dst_ifp, PFIL_OUT) != 0) { 1127 m_freem(m); 1128 return; 1129 } 1130 if (m == NULL) 1131 return; 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 mflags = m->m_flags; 1149 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1150 if (error) { 1151 /* mbuf is already freed */ 1152 sc->sc_if.if_oerrors++; 1153 return; 1154 } 1155 1156 sc->sc_if.if_opackets++; 1157 sc->sc_if.if_obytes += len; 1158 1159 dst_ifp->if_obytes += len; 1160 1161 if (mflags & M_MCAST) { 1162 sc->sc_if.if_omcasts++; 1163 dst_ifp->if_omcasts++; 1164 } 1165 1166 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1167 (*dst_ifp->if_start)(dst_ifp); 1168 } 1169 1170 /* 1171 * bridge_output: 1172 * 1173 * Send output from a bridge member interface. This 1174 * performs the bridging function for locally originated 1175 * packets. 1176 * 1177 * The mbuf has the Ethernet header already attached. We must 1178 * enqueue or free the mbuf before returning. 1179 */ 1180 int 1181 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1182 struct rtentry *rt) 1183 { 1184 struct ether_header *eh; 1185 struct ifnet *dst_if; 1186 struct bridge_softc *sc; 1187 int s; 1188 1189 if (m->m_len < ETHER_HDR_LEN) { 1190 m = m_pullup(m, ETHER_HDR_LEN); 1191 if (m == NULL) 1192 return (0); 1193 } 1194 1195 eh = mtod(m, struct ether_header *); 1196 sc = ifp->if_bridge; 1197 1198 s = splnet(); 1199 1200 /* 1201 * If bridge is down, but the original output interface is up, 1202 * go ahead and send out that interface. Otherwise, the packet 1203 * is dropped below. 1204 */ 1205 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1206 dst_if = ifp; 1207 goto sendunicast; 1208 } 1209 1210 /* 1211 * If the packet is a multicast, or we don't know a better way to 1212 * get there, send to all interfaces. 1213 */ 1214 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1215 dst_if = NULL; 1216 else 1217 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1218 if (dst_if == NULL) { 1219 struct bridge_iflist *bif; 1220 struct mbuf *mc; 1221 int used = 0; 1222 1223 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1224 dst_if = bif->bif_ifp; 1225 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1226 continue; 1227 1228 /* 1229 * If this is not the original output interface, 1230 * and the interface is participating in spanning 1231 * tree, make sure the port is in a state that 1232 * allows forwarding. 1233 */ 1234 if (dst_if != ifp && 1235 (bif->bif_flags & IFBIF_STP) != 0) { 1236 switch (bif->bif_state) { 1237 case BSTP_IFSTATE_BLOCKING: 1238 case BSTP_IFSTATE_LISTENING: 1239 case BSTP_IFSTATE_DISABLED: 1240 continue; 1241 } 1242 } 1243 1244 if (LIST_NEXT(bif, bif_next) == NULL) { 1245 used = 1; 1246 mc = m; 1247 } else { 1248 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1249 if (mc == NULL) { 1250 sc->sc_if.if_oerrors++; 1251 continue; 1252 } 1253 } 1254 1255 bridge_enqueue(sc, dst_if, mc); 1256 } 1257 if (used == 0) 1258 m_freem(m); 1259 splx(s); 1260 return (0); 1261 } 1262 1263 sendunicast: 1264 /* 1265 * XXX Spanning tree consideration here? 1266 */ 1267 1268 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1269 m_freem(m); 1270 splx(s); 1271 return (0); 1272 } 1273 1274 bridge_enqueue(sc, dst_if, m); 1275 1276 splx(s); 1277 return (0); 1278 } 1279 1280 /* 1281 * bridge_start: 1282 * 1283 * Start output on a bridge. 1284 * 1285 * NOTE: This routine should never be called in this implementation. 1286 */ 1287 void 1288 bridge_start(struct ifnet *ifp) 1289 { 1290 1291 printf("%s: bridge_start() called\n", ifp->if_xname); 1292 } 1293 1294 /* 1295 * bridge_forward: 1296 * 1297 * The fowarding function of the bridge. 1298 */ 1299 void 1300 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1301 { 1302 struct bridge_iflist *bif; 1303 struct ifnet *src_if, *dst_if; 1304 struct ether_header *eh; 1305 1306 src_if = m->m_pkthdr.rcvif; 1307 1308 sc->sc_if.if_ipackets++; 1309 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1310 1311 /* 1312 * Look up the bridge_iflist. 1313 */ 1314 bif = bridge_lookup_member_if(sc, src_if); 1315 if (bif == NULL) { 1316 /* Interface is not a bridge member (anymore?) */ 1317 m_freem(m); 1318 return; 1319 } 1320 1321 if (bif->bif_flags & IFBIF_STP) { 1322 switch (bif->bif_state) { 1323 case BSTP_IFSTATE_BLOCKING: 1324 case BSTP_IFSTATE_LISTENING: 1325 case BSTP_IFSTATE_DISABLED: 1326 m_freem(m); 1327 return; 1328 } 1329 } 1330 1331 eh = mtod(m, struct ether_header *); 1332 1333 /* 1334 * If the interface is learning, and the source 1335 * address is valid and not multicast, record 1336 * the address. 1337 */ 1338 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1339 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1340 (eh->ether_shost[0] == 0 && 1341 eh->ether_shost[1] == 0 && 1342 eh->ether_shost[2] == 0 && 1343 eh->ether_shost[3] == 0 && 1344 eh->ether_shost[4] == 0 && 1345 eh->ether_shost[5] == 0) == 0) { 1346 (void) bridge_rtupdate(sc, eh->ether_shost, 1347 src_if, 0, IFBAF_DYNAMIC); 1348 } 1349 1350 if ((bif->bif_flags & IFBIF_STP) != 0 && 1351 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1352 m_freem(m); 1353 return; 1354 } 1355 1356 /* 1357 * At this point, the port either doesn't participate 1358 * in spanning tree or it is in the forwarding state. 1359 */ 1360 1361 /* 1362 * If the packet is unicast, destined for someone on 1363 * "this" side of the bridge, drop it. 1364 */ 1365 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1366 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1367 if (src_if == dst_if) { 1368 m_freem(m); 1369 return; 1370 } 1371 } else { 1372 /* ...forward it to all interfaces. */ 1373 sc->sc_if.if_imcasts++; 1374 dst_if = NULL; 1375 } 1376 1377 #ifdef PFIL_HOOKS 1378 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1379 m_freem(m); 1380 return; 1381 } 1382 if (m == NULL) 1383 return; 1384 #endif /* PFIL_HOOKS */ 1385 1386 if (dst_if == NULL) { 1387 bridge_broadcast(sc, src_if, m); 1388 return; 1389 } 1390 1391 /* 1392 * At this point, we're dealing with a unicast frame 1393 * going to a different interface. 1394 */ 1395 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1396 m_freem(m); 1397 return; 1398 } 1399 bif = bridge_lookup_member_if(sc, dst_if); 1400 if (bif == NULL) { 1401 /* Not a member of the bridge (anymore?) */ 1402 m_freem(m); 1403 return; 1404 } 1405 1406 if (bif->bif_flags & IFBIF_STP) { 1407 switch (bif->bif_state) { 1408 case BSTP_IFSTATE_DISABLED: 1409 case BSTP_IFSTATE_BLOCKING: 1410 m_freem(m); 1411 return; 1412 } 1413 } 1414 1415 bridge_enqueue(sc, dst_if, m); 1416 } 1417 1418 /* 1419 * bridge_input: 1420 * 1421 * Receive input from a member interface. Queue the packet for 1422 * bridging if it is not for us. 1423 */ 1424 struct mbuf * 1425 bridge_input(struct ifnet *ifp, struct mbuf *m) 1426 { 1427 struct bridge_softc *sc = ifp->if_bridge; 1428 struct bridge_iflist *bif; 1429 struct ether_header *eh; 1430 struct mbuf *mc; 1431 1432 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1433 return (m); 1434 1435 bif = bridge_lookup_member_if(sc, ifp); 1436 if (bif == NULL) 1437 return (m); 1438 1439 eh = mtod(m, struct ether_header *); 1440 1441 if (m->m_flags & (M_BCAST|M_MCAST)) { 1442 /* Tap off 802.1D packets; they do not get forwarded. */ 1443 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1444 ETHER_ADDR_LEN) == 0) { 1445 m = bstp_input(ifp, m); 1446 if (m == NULL) 1447 return (NULL); 1448 } 1449 1450 if (bif->bif_flags & IFBIF_STP) { 1451 switch (bif->bif_state) { 1452 case BSTP_IFSTATE_BLOCKING: 1453 case BSTP_IFSTATE_LISTENING: 1454 case BSTP_IFSTATE_DISABLED: 1455 return (m); 1456 } 1457 } 1458 1459 /* 1460 * Make a deep copy of the packet and enqueue the copy 1461 * for bridge processing; return the original packet for 1462 * local processing. 1463 */ 1464 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1465 if (mc == NULL) 1466 return (m); 1467 1468 /* Perform the bridge forwarding function with the copy. */ 1469 bridge_forward(sc, mc); 1470 1471 /* Return the original packet for local processing. */ 1472 return (m); 1473 } 1474 1475 if (bif->bif_flags & IFBIF_STP) { 1476 switch (bif->bif_state) { 1477 case BSTP_IFSTATE_BLOCKING: 1478 case BSTP_IFSTATE_LISTENING: 1479 case BSTP_IFSTATE_DISABLED: 1480 return (m); 1481 } 1482 } 1483 1484 /* 1485 * Unicast. Make sure it's not for us. 1486 */ 1487 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1488 /* It is destined for us. */ 1489 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1490 ETHER_ADDR_LEN) == 0) { 1491 if (bif->bif_flags & IFBIF_LEARNING) 1492 (void) bridge_rtupdate(sc, 1493 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1494 m->m_pkthdr.rcvif = bif->bif_ifp; 1495 return (m); 1496 } 1497 1498 /* We just received a packet that we sent out. */ 1499 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1500 ETHER_ADDR_LEN) == 0) { 1501 m_freem(m); 1502 return (NULL); 1503 } 1504 } 1505 1506 /* Perform the bridge forwarding function. */ 1507 bridge_forward(sc, m); 1508 1509 return (NULL); 1510 } 1511 1512 /* 1513 * bridge_broadcast: 1514 * 1515 * Send a frame to all interfaces that are members of 1516 * the bridge, except for the one on which the packet 1517 * arrived. 1518 */ 1519 void 1520 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1521 struct mbuf *m) 1522 { 1523 struct bridge_iflist *bif; 1524 struct mbuf *mc; 1525 struct ifnet *dst_if; 1526 int used = 0; 1527 1528 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1529 dst_if = bif->bif_ifp; 1530 if (dst_if == src_if) 1531 continue; 1532 1533 if (bif->bif_flags & IFBIF_STP) { 1534 switch (bif->bif_state) { 1535 case BSTP_IFSTATE_BLOCKING: 1536 case BSTP_IFSTATE_DISABLED: 1537 continue; 1538 } 1539 } 1540 1541 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1542 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1543 continue; 1544 1545 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1546 continue; 1547 1548 if (LIST_NEXT(bif, bif_next) == NULL) { 1549 mc = m; 1550 used = 1; 1551 } else { 1552 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1553 if (mc == NULL) { 1554 sc->sc_if.if_oerrors++; 1555 continue; 1556 } 1557 } 1558 1559 bridge_enqueue(sc, dst_if, mc); 1560 } 1561 if (used == 0) 1562 m_freem(m); 1563 } 1564 1565 /* 1566 * bridge_rtupdate: 1567 * 1568 * Add a bridge routing entry. 1569 */ 1570 int 1571 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1572 struct ifnet *dst_if, int setflags, uint8_t flags) 1573 { 1574 struct bridge_rtnode *brt; 1575 int error; 1576 1577 /* 1578 * A route for this destination might already exist. If so, 1579 * update it, otherwise create a new one. 1580 */ 1581 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1582 if (sc->sc_brtcnt >= sc->sc_brtmax) 1583 return (ENOSPC); 1584 1585 /* 1586 * Allocate a new bridge forwarding node, and 1587 * initialize the expiration time and Ethernet 1588 * address. 1589 */ 1590 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1591 if (brt == NULL) 1592 return (ENOMEM); 1593 1594 memset(brt, 0, sizeof(*brt)); 1595 brt->brt_expire = mono_time.tv_sec + sc->sc_brttimeout; 1596 brt->brt_flags = IFBAF_DYNAMIC; 1597 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1598 1599 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1600 pool_put(&bridge_rtnode_pool, brt); 1601 return (error); 1602 } 1603 } 1604 1605 brt->brt_ifp = dst_if; 1606 if (setflags) { 1607 brt->brt_flags = flags; 1608 brt->brt_expire = (flags & IFBAF_STATIC) ? 0 : 1609 mono_time.tv_sec + sc->sc_brttimeout; 1610 } 1611 1612 return (0); 1613 } 1614 1615 /* 1616 * bridge_rtlookup: 1617 * 1618 * Lookup the destination interface for an address. 1619 */ 1620 struct ifnet * 1621 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1622 { 1623 struct bridge_rtnode *brt; 1624 1625 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1626 return (NULL); 1627 1628 return (brt->brt_ifp); 1629 } 1630 1631 /* 1632 * bridge_rttrim: 1633 * 1634 * Trim the routine table so that we have a number 1635 * of routing entries less than or equal to the 1636 * maximum number. 1637 */ 1638 void 1639 bridge_rttrim(struct bridge_softc *sc) 1640 { 1641 struct bridge_rtnode *brt, *nbrt; 1642 1643 /* Make sure we actually need to do this. */ 1644 if (sc->sc_brtcnt <= sc->sc_brtmax) 1645 return; 1646 1647 /* Force an aging cycle; this might trim enough addresses. */ 1648 bridge_rtage(sc); 1649 if (sc->sc_brtcnt <= sc->sc_brtmax) 1650 return; 1651 1652 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1653 nbrt = LIST_NEXT(brt, brt_list); 1654 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1655 bridge_rtnode_destroy(sc, brt); 1656 if (sc->sc_brtcnt <= sc->sc_brtmax) 1657 return; 1658 } 1659 } 1660 } 1661 1662 /* 1663 * bridge_timer: 1664 * 1665 * Aging timer for the bridge. 1666 */ 1667 void 1668 bridge_timer(void *arg) 1669 { 1670 struct bridge_softc *sc = arg; 1671 int s; 1672 1673 s = splnet(); 1674 bridge_rtage(sc); 1675 splx(s); 1676 1677 if (sc->sc_if.if_flags & IFF_RUNNING) 1678 callout_reset(&sc->sc_brcallout, 1679 bridge_rtable_prune_period * hz, bridge_timer, sc); 1680 } 1681 1682 /* 1683 * bridge_rtage: 1684 * 1685 * Perform an aging cycle. 1686 */ 1687 void 1688 bridge_rtage(struct bridge_softc *sc) 1689 { 1690 struct bridge_rtnode *brt, *nbrt; 1691 1692 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1693 nbrt = LIST_NEXT(brt, brt_list); 1694 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1695 if (mono_time.tv_sec >= brt->brt_expire) 1696 bridge_rtnode_destroy(sc, brt); 1697 } 1698 } 1699 } 1700 1701 /* 1702 * bridge_rtflush: 1703 * 1704 * Remove all dynamic addresses from the bridge. 1705 */ 1706 void 1707 bridge_rtflush(struct bridge_softc *sc, int full) 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 (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1714 bridge_rtnode_destroy(sc, brt); 1715 } 1716 } 1717 1718 /* 1719 * bridge_rtdaddr: 1720 * 1721 * Remove an address from the table. 1722 */ 1723 int 1724 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1725 { 1726 struct bridge_rtnode *brt; 1727 1728 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1729 return (ENOENT); 1730 1731 bridge_rtnode_destroy(sc, brt); 1732 return (0); 1733 } 1734 1735 /* 1736 * bridge_rtdelete: 1737 * 1738 * Delete routes to a speicifc member interface. 1739 */ 1740 void 1741 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1742 { 1743 struct bridge_rtnode *brt, *nbrt; 1744 1745 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1746 nbrt = LIST_NEXT(brt, brt_list); 1747 if (brt->brt_ifp == ifp) 1748 bridge_rtnode_destroy(sc, brt); 1749 } 1750 } 1751 1752 /* 1753 * bridge_rtable_init: 1754 * 1755 * Initialize the route table for this bridge. 1756 */ 1757 int 1758 bridge_rtable_init(struct bridge_softc *sc) 1759 { 1760 int i; 1761 1762 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1763 M_DEVBUF, M_NOWAIT); 1764 if (sc->sc_rthash == NULL) 1765 return (ENOMEM); 1766 1767 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1768 LIST_INIT(&sc->sc_rthash[i]); 1769 1770 sc->sc_rthash_key = arc4random(); 1771 1772 LIST_INIT(&sc->sc_rtlist); 1773 1774 return (0); 1775 } 1776 1777 /* 1778 * bridge_rtable_fini: 1779 * 1780 * Deconstruct the route table for this bridge. 1781 */ 1782 void 1783 bridge_rtable_fini(struct bridge_softc *sc) 1784 { 1785 1786 free(sc->sc_rthash, M_DEVBUF); 1787 } 1788 1789 /* 1790 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1791 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1792 */ 1793 #define mix(a, b, c) \ 1794 do { \ 1795 a -= b; a -= c; a ^= (c >> 13); \ 1796 b -= c; b -= a; b ^= (a << 8); \ 1797 c -= a; c -= b; c ^= (b >> 13); \ 1798 a -= b; a -= c; a ^= (c >> 12); \ 1799 b -= c; b -= a; b ^= (a << 16); \ 1800 c -= a; c -= b; c ^= (b >> 5); \ 1801 a -= b; a -= c; a ^= (c >> 3); \ 1802 b -= c; b -= a; b ^= (a << 10); \ 1803 c -= a; c -= b; c ^= (b >> 15); \ 1804 } while (/*CONSTCOND*/0) 1805 1806 static __inline uint32_t 1807 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1808 { 1809 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1810 1811 b += addr[5] << 8; 1812 b += addr[4]; 1813 a += addr[3] << 24; 1814 a += addr[2] << 16; 1815 a += addr[1] << 8; 1816 a += addr[0]; 1817 1818 mix(a, b, c); 1819 1820 return (c & BRIDGE_RTHASH_MASK); 1821 } 1822 1823 #undef mix 1824 1825 /* 1826 * bridge_rtnode_lookup: 1827 * 1828 * Look up a bridge route node for the specified destination. 1829 */ 1830 struct bridge_rtnode * 1831 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1832 { 1833 struct bridge_rtnode *brt; 1834 uint32_t hash; 1835 int dir; 1836 1837 hash = bridge_rthash(sc, addr); 1838 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1839 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1840 if (dir == 0) 1841 return (brt); 1842 if (dir > 0) 1843 return (NULL); 1844 } 1845 1846 return (NULL); 1847 } 1848 1849 /* 1850 * bridge_rtnode_insert: 1851 * 1852 * Insert the specified bridge node into the route table. We 1853 * assume the entry is not already in the table. 1854 */ 1855 int 1856 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1857 { 1858 struct bridge_rtnode *lbrt; 1859 uint32_t hash; 1860 int dir; 1861 1862 hash = bridge_rthash(sc, brt->brt_addr); 1863 1864 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1865 if (lbrt == NULL) { 1866 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1867 goto out; 1868 } 1869 1870 do { 1871 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1872 if (dir == 0) 1873 return (EEXIST); 1874 if (dir > 0) { 1875 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1876 goto out; 1877 } 1878 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1879 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1880 goto out; 1881 } 1882 lbrt = LIST_NEXT(lbrt, brt_hash); 1883 } while (lbrt != NULL); 1884 1885 #ifdef DIAGNOSTIC 1886 panic("bridge_rtnode_insert: impossible"); 1887 #endif 1888 1889 out: 1890 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1891 sc->sc_brtcnt++; 1892 1893 return (0); 1894 } 1895 1896 /* 1897 * bridge_rtnode_destroy: 1898 * 1899 * Destroy a bridge rtnode. 1900 */ 1901 void 1902 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1903 { 1904 1905 LIST_REMOVE(brt, brt_hash); 1906 1907 LIST_REMOVE(brt, brt_list); 1908 sc->sc_brtcnt--; 1909 pool_put(&bridge_rtnode_pool, brt); 1910 } 1911 1912 #ifdef BRIDGE_IPF 1913 extern struct pfil_head inet_pfil_hook; /* XXX */ 1914 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1915 1916 /* 1917 * Send bridge packets through IPF if they are one of the types IPF can deal 1918 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1919 * question.) 1920 */ 1921 static int bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1922 { 1923 int snap, error; 1924 struct ether_header *eh; 1925 struct mbuf *m1, *m2; 1926 u_int16_t ether_type; 1927 1928 snap = 0; 1929 error = -1; /* Default error if not error == 0 */ 1930 eh = mtod(*mp, struct ether_header *); 1931 ether_type = ntohs(eh->ether_type); 1932 1933 /* 1934 * Check for SNAP/LLC. 1935 */ 1936 if (ether_type < ETHERMTU) { 1937 struct llc *llc = (struct llc *)(eh + 1); 1938 1939 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1940 llc->llc_dsap == LLC_SNAP_LSAP && 1941 llc->llc_ssap == LLC_SNAP_LSAP && 1942 llc->llc_control == LLC_UI) { 1943 ether_type = htons(llc->llc_un.type_snap.ether_type); 1944 snap = 1; 1945 } 1946 } 1947 1948 /* 1949 * If we're trying to filter bridge traffic, don't look at anything 1950 * other than IP and ARP traffic. If the filter doesn't understand 1951 * IPv6, don't allow IPv6 through the bridge either. This is lame 1952 * since if we really wanted, say, an AppleTalk filter, we are hosed, 1953 * but of course we don't have an AppleTalk filter to begin with. 1954 * (Note that since IPF doesn't understand ARP it will pass *ALL* 1955 * ARP traffic.) 1956 */ 1957 switch (ether_type) { 1958 case ETHERTYPE_ARP: 1959 case ETHERTYPE_REVARP: 1960 return 0; /* Automatically pass */ 1961 case ETHERTYPE_IP: 1962 # ifdef INET6 1963 case ETHERTYPE_IPV6: 1964 # endif /* INET6 */ 1965 break; 1966 default: 1967 goto bad; 1968 } 1969 1970 /* Strip off the Ethernet header---but keep a copy. */ 1971 if ((m1 = m_split(*mp, sizeof(struct ether_header), M_NOWAIT)) == NULL) 1972 goto bad; 1973 /* Strip off snap header, if present */ 1974 if (snap) { 1975 if ((m2 = m_split(m1, sizeof(struct llc), M_NOWAIT)) == NULL) 1976 goto bad2; 1977 } else 1978 m2 = m1; 1979 1980 /* 1981 * Check basic packet sanity, if the packet is outbound, and 1982 * run IPF filter. 1983 */ 1984 if (ether_type == ETHERTYPE_IP && 1985 (dir == PFIL_OUT || bridge_ip_checkbasic(&m2) == 0)) { 1986 error = pfil_run_hooks(&inet_pfil_hook, &m2, ifp, dir); 1987 if (error) goto bad2; 1988 } 1989 # ifdef INET6 1990 if (ether_type == ETHERTYPE_IPV6 && 1991 (dir == PFIL_OUT || bridge_ip6_checkbasic(&m2) == 0)) { 1992 error = pfil_run_hooks(&inet6_pfil_hook, &m2, ifp, dir); 1993 if (error) goto bad2; 1994 } 1995 # endif 1996 if (m2 == NULL) goto bad2; 1997 1998 /* 1999 * Finally, put everything back the way it was and return 2000 */ 2001 if (snap) 2002 m_cat(m1, m2); 2003 else 2004 m1 = m2; 2005 m_cat(*mp, m1); 2006 return 0; 2007 2008 bad2: 2009 if (snap) 2010 m_freem(m1); 2011 m_freem(m2); 2012 bad: 2013 m_freem(*mp); 2014 *mp = NULL; 2015 return error; 2016 } 2017 2018 /* 2019 * Perform basic checks on header size since 2020 * IPF assumes ip_input has already processed 2021 * it for it. Cut-and-pasted from ip_input.c. 2022 * Given how simple the IPv6 version is, 2023 * does the IPv4 version really need to be 2024 * this complicated? 2025 * 2026 * XXX Should we update ipstat here, or not? 2027 * XXX Right now we update ipstat but not 2028 * XXX csum_counter. 2029 */ 2030 static int 2031 bridge_ip_checkbasic(struct mbuf **mp) 2032 { 2033 struct mbuf *m = *mp; 2034 struct ip *ip; 2035 int len, hlen; 2036 2037 if (*mp == NULL) 2038 return -1; 2039 2040 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2041 if ((m = m_copyup(m, sizeof(struct ip), 2042 (max_linkhdr + 3) & ~3)) == NULL) { 2043 /* XXXJRT new stat, please */ 2044 ipstat.ips_toosmall++; 2045 goto bad; 2046 } 2047 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2048 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2049 ipstat.ips_toosmall++; 2050 goto bad; 2051 } 2052 } 2053 ip = mtod(m, struct ip *); 2054 if (ip == NULL) goto bad; 2055 2056 if (ip->ip_v != IPVERSION) { 2057 ipstat.ips_badvers++; 2058 goto bad; 2059 } 2060 hlen = ip->ip_hl << 2; 2061 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2062 ipstat.ips_badhlen++; 2063 goto bad; 2064 } 2065 if (hlen > m->m_len) { 2066 if ((m = m_pullup(m, hlen)) == 0) { 2067 ipstat.ips_badhlen++; 2068 goto bad; 2069 } 2070 ip = mtod(m, struct ip *); 2071 if (ip == NULL) goto bad; 2072 } 2073 2074 switch (m->m_pkthdr.csum_flags & 2075 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2076 M_CSUM_IPv4_BAD)) { 2077 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2078 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2079 goto bad; 2080 2081 case M_CSUM_IPv4: 2082 /* Checksum was okay. */ 2083 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2084 break; 2085 2086 default: 2087 /* Must compute it ourselves. */ 2088 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2089 if (in_cksum(m, hlen) != 0) 2090 goto bad; 2091 break; 2092 } 2093 2094 /* Retrieve the packet length. */ 2095 len = ntohs(ip->ip_len); 2096 2097 /* 2098 * Check for additional length bogosity 2099 */ 2100 if (len < hlen) { 2101 ipstat.ips_badlen++; 2102 goto bad; 2103 } 2104 2105 /* 2106 * Check that the amount of data in the buffers 2107 * is as at least much as the IP header would have us expect. 2108 * Drop packet if shorter than we expect. 2109 */ 2110 if (m->m_pkthdr.len < len) { 2111 ipstat.ips_tooshort++; 2112 goto bad; 2113 } 2114 2115 /* Checks out, proceed */ 2116 *mp = m; 2117 return 0; 2118 2119 bad: 2120 *mp = m; 2121 return -1; 2122 } 2123 2124 # ifdef INET6 2125 /* 2126 * Same as above, but for IPv6. 2127 * Cut-and-pasted from ip6_input.c. 2128 * XXX Should we update ip6stat, or not? 2129 */ 2130 static int 2131 bridge_ip6_checkbasic(struct mbuf **mp) 2132 { 2133 struct mbuf *m = *mp; 2134 struct ip6_hdr *ip6; 2135 2136 /* 2137 * If the IPv6 header is not aligned, slurp it up into a new 2138 * mbuf with space for link headers, in the event we forward 2139 * it. Otherwise, if it is aligned, make sure the entire base 2140 * IPv6 header is in the first mbuf of the chain. 2141 */ 2142 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2143 struct ifnet *inifp = m->m_pkthdr.rcvif; 2144 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2145 (max_linkhdr + 3) & ~3)) == NULL) { 2146 /* XXXJRT new stat, please */ 2147 ip6stat.ip6s_toosmall++; 2148 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2149 goto bad; 2150 } 2151 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2152 struct ifnet *inifp = m->m_pkthdr.rcvif; 2153 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2154 ip6stat.ip6s_toosmall++; 2155 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2156 goto bad; 2157 } 2158 } 2159 2160 ip6 = mtod(m, struct ip6_hdr *); 2161 2162 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2163 ip6stat.ip6s_badvers++; 2164 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2165 goto bad; 2166 } 2167 2168 /* Checks out, proceed */ 2169 *mp = m; 2170 return 0; 2171 2172 bad: 2173 *mp = m; 2174 return -1; 2175 } 2176 # endif /* INET6 */ 2177 #endif /* BRIDGE_IPF */ 2178