if_bridge.c revision 1.13
1 /* $NetBSD: if_bridge.c,v 1.13 2003/05/16 04:54:55 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 (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 * - Add packet filter hooks. 82 */ 83 84 #include <sys/cdefs.h> 85 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.13 2003/05/16 04:54:55 itojun Exp $"); 86 87 #include "opt_bridge_ipf.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> 99 100 #if NBPFILTER > 0 101 #include <net/bpf.h> 102 #endif 103 #include <net/if.h> 104 #include <net/if_dl.h> 105 #include <net/if_types.h> 106 #include <net/if_llc.h> 107 108 #include <net/if_ether.h> 109 #include <net/if_bridgevar.h> 110 111 #ifdef BRIDGE_IPF /* Used for bridge_ip[6]_checkbasic */ 112 #include <netinet/in.h> 113 #include <netinet/in_systm.h> 114 #include <netinet/ip.h> 115 #include <netinet/ip_var.h> 116 117 #include <netinet/ip6.h> 118 #include <netinet6/in6_var.h> 119 #include <netinet6/ip6_var.h> 120 #endif /* BRIDGE_IPF */ 121 122 /* 123 * Size of the route hash table. Must be a power of two. 124 */ 125 #ifndef BRIDGE_RTHASH_SIZE 126 #define BRIDGE_RTHASH_SIZE 1024 127 #endif 128 129 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 130 131 /* 132 * Maximum number of addresses to cache. 133 */ 134 #ifndef BRIDGE_RTABLE_MAX 135 #define BRIDGE_RTABLE_MAX 100 136 #endif 137 138 /* 139 * Spanning tree defaults. 140 */ 141 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 142 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 143 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 144 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 145 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 146 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 147 #define BSTP_DEFAULT_PATH_COST 55 148 149 /* 150 * Timeout (in seconds) for entries learned dynamically. 151 */ 152 #ifndef BRIDGE_RTABLE_TIMEOUT 153 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 154 #endif 155 156 /* 157 * Number of seconds between walks of the route list. 158 */ 159 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 160 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 161 #endif 162 163 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 164 165 struct pool bridge_rtnode_pool; 166 167 void bridgeattach(int); 168 169 int bridge_clone_create(struct if_clone *, int); 170 void bridge_clone_destroy(struct ifnet *); 171 172 int bridge_ioctl(struct ifnet *, u_long, caddr_t); 173 int bridge_init(struct ifnet *); 174 void bridge_stop(struct ifnet *, int); 175 void bridge_start(struct ifnet *); 176 177 void bridge_forward(struct bridge_softc *, struct mbuf *m); 178 179 void bridge_timer(void *); 180 181 void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *); 182 183 int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 184 struct ifnet *, int, uint8_t); 185 struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 186 void bridge_rttrim(struct bridge_softc *); 187 void bridge_rtage(struct bridge_softc *); 188 void bridge_rtflush(struct bridge_softc *, int); 189 int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 190 void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 191 192 int bridge_rtable_init(struct bridge_softc *); 193 void bridge_rtable_fini(struct bridge_softc *); 194 195 struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 196 const uint8_t *); 197 int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); 198 void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); 199 200 struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 201 const char *name); 202 struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 203 struct ifnet *ifp); 204 void bridge_delete_member(struct bridge_softc *, struct bridge_iflist *); 205 206 int bridge_ioctl_add(struct bridge_softc *, void *); 207 int bridge_ioctl_del(struct bridge_softc *, void *); 208 int bridge_ioctl_gifflags(struct bridge_softc *, void *); 209 int bridge_ioctl_sifflags(struct bridge_softc *, void *); 210 int bridge_ioctl_scache(struct bridge_softc *, void *); 211 int bridge_ioctl_gcache(struct bridge_softc *, void *); 212 int bridge_ioctl_gifs(struct bridge_softc *, void *); 213 int bridge_ioctl_rts(struct bridge_softc *, void *); 214 int bridge_ioctl_saddr(struct bridge_softc *, void *); 215 int bridge_ioctl_sto(struct bridge_softc *, void *); 216 int bridge_ioctl_gto(struct bridge_softc *, void *); 217 int bridge_ioctl_daddr(struct bridge_softc *, void *); 218 int bridge_ioctl_flush(struct bridge_softc *, void *); 219 int bridge_ioctl_gpri(struct bridge_softc *, void *); 220 int bridge_ioctl_spri(struct bridge_softc *, void *); 221 int bridge_ioctl_ght(struct bridge_softc *, void *); 222 int bridge_ioctl_sht(struct bridge_softc *, void *); 223 int bridge_ioctl_gfd(struct bridge_softc *, void *); 224 int bridge_ioctl_sfd(struct bridge_softc *, void *); 225 int bridge_ioctl_gma(struct bridge_softc *, void *); 226 int bridge_ioctl_sma(struct bridge_softc *, void *); 227 int bridge_ioctl_sifprio(struct bridge_softc *, void *); 228 int bridge_ioctl_sifcost(struct bridge_softc *, void *); 229 #ifdef BRIDGE_IPF 230 int bridge_ioctl_gfilt(struct bridge_softc *, void *); 231 int bridge_ioctl_sfilt(struct bridge_softc *, void *); 232 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 233 static int bridge_ip_checkbasic(struct mbuf **mp); 234 # ifdef INET6 235 static int bridge_ip6_checkbasic(struct mbuf **mp); 236 # endif /* INET6 */ 237 #endif /* BRIDGE_IPF */ 238 239 struct bridge_control { 240 int (*bc_func)(struct bridge_softc *, void *); 241 int bc_argsize; 242 int bc_flags; 243 }; 244 245 #define BC_F_COPYIN 0x01 /* copy arguments in */ 246 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 247 #define BC_F_SUSER 0x04 /* do super-user check */ 248 249 const struct bridge_control bridge_control_table[] = { 250 { bridge_ioctl_add, sizeof(struct ifbreq), 251 BC_F_COPYIN|BC_F_SUSER }, 252 { bridge_ioctl_del, sizeof(struct ifbreq), 253 BC_F_COPYIN|BC_F_SUSER }, 254 255 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 256 BC_F_COPYIN|BC_F_COPYOUT }, 257 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 258 BC_F_COPYIN|BC_F_SUSER }, 259 260 { bridge_ioctl_scache, sizeof(struct ifbrparam), 261 BC_F_COPYIN|BC_F_SUSER }, 262 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 263 BC_F_COPYOUT }, 264 265 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 266 BC_F_COPYIN|BC_F_COPYOUT }, 267 { bridge_ioctl_rts, sizeof(struct ifbaconf), 268 BC_F_COPYIN|BC_F_COPYOUT }, 269 270 { bridge_ioctl_saddr, sizeof(struct ifbareq), 271 BC_F_COPYIN|BC_F_SUSER }, 272 273 { bridge_ioctl_sto, sizeof(struct ifbrparam), 274 BC_F_COPYIN|BC_F_SUSER }, 275 { bridge_ioctl_gto, sizeof(struct ifbrparam), 276 BC_F_COPYOUT }, 277 278 { bridge_ioctl_daddr, sizeof(struct ifbareq), 279 BC_F_COPYIN|BC_F_SUSER }, 280 281 { bridge_ioctl_flush, sizeof(struct ifbreq), 282 BC_F_COPYIN|BC_F_SUSER }, 283 284 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 285 BC_F_COPYOUT }, 286 { bridge_ioctl_spri, sizeof(struct ifbrparam), 287 BC_F_COPYIN|BC_F_SUSER }, 288 289 { bridge_ioctl_ght, sizeof(struct ifbrparam), 290 BC_F_COPYOUT }, 291 { bridge_ioctl_sht, sizeof(struct ifbrparam), 292 BC_F_COPYIN|BC_F_SUSER }, 293 294 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 295 BC_F_COPYOUT }, 296 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 297 BC_F_COPYIN|BC_F_SUSER }, 298 299 { bridge_ioctl_gma, sizeof(struct ifbrparam), 300 BC_F_COPYOUT }, 301 { bridge_ioctl_sma, sizeof(struct ifbrparam), 302 BC_F_COPYIN|BC_F_SUSER }, 303 304 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 305 BC_F_COPYIN|BC_F_SUSER }, 306 307 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 308 BC_F_COPYIN|BC_F_SUSER }, 309 #ifdef BRIDGE_IPF 310 { bridge_ioctl_gfilt, sizeof(struct ifbrparam), 311 BC_F_COPYOUT }, 312 { bridge_ioctl_sfilt, sizeof(struct ifbrparam), 313 BC_F_COPYIN|BC_F_SUSER }, 314 #endif /* BRIDGE_IPF */ 315 }; 316 const int bridge_control_table_size = 317 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 318 319 LIST_HEAD(, bridge_softc) bridge_list; 320 321 struct if_clone bridge_cloner = 322 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 323 324 /* 325 * bridgeattach: 326 * 327 * Pseudo-device attach routine. 328 */ 329 void 330 bridgeattach(int n) 331 { 332 333 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 334 0, 0, 0, "brtpl", NULL); 335 336 LIST_INIT(&bridge_list); 337 if_clone_attach(&bridge_cloner); 338 } 339 340 /* 341 * bridge_clone_create: 342 * 343 * Create a new bridge instance. 344 */ 345 int 346 bridge_clone_create(struct if_clone *ifc, int unit) 347 { 348 struct bridge_softc *sc; 349 struct ifnet *ifp; 350 int s; 351 352 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK); 353 memset(sc, 0, sizeof(*sc)); 354 ifp = &sc->sc_if; 355 356 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 357 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 358 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 359 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 360 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 361 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 362 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 363 sc->sc_filter_flags = 0; 364 365 /* Initialize our routing table. */ 366 bridge_rtable_init(sc); 367 368 callout_init(&sc->sc_brcallout); 369 callout_init(&sc->sc_bstpcallout); 370 371 LIST_INIT(&sc->sc_iflist); 372 373 sprintf(ifp->if_xname, "%s%d", ifc->ifc_name, unit); 374 ifp->if_softc = sc; 375 ifp->if_mtu = ETHERMTU; 376 ifp->if_ioctl = bridge_ioctl; 377 ifp->if_output = bridge_output; 378 ifp->if_start = bridge_start; 379 ifp->if_stop = bridge_stop; 380 ifp->if_init = bridge_init; 381 ifp->if_type = IFT_BRIDGE; 382 ifp->if_addrlen = 0; 383 ifp->if_dlt = DLT_EN10MB; 384 ifp->if_hdrlen = ETHER_HDR_LEN; 385 386 if_attach(ifp); 387 388 if_alloc_sadl(ifp); 389 390 s = splnet(); 391 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 392 splx(s); 393 394 return (0); 395 } 396 397 /* 398 * bridge_clone_destroy: 399 * 400 * Destroy a bridge instance. 401 */ 402 void 403 bridge_clone_destroy(struct ifnet *ifp) 404 { 405 struct bridge_softc *sc = ifp->if_softc; 406 struct bridge_iflist *bif; 407 int s; 408 409 s = splnet(); 410 411 bridge_stop(ifp, 1); 412 413 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 414 bridge_delete_member(sc, bif); 415 416 LIST_REMOVE(sc, sc_list); 417 418 splx(s); 419 420 if_detach(ifp); 421 422 /* Tear down the routing table. */ 423 bridge_rtable_fini(sc); 424 425 free(sc, M_DEVBUF); 426 } 427 428 /* 429 * bridge_ioctl: 430 * 431 * Handle a control request from the operator. 432 */ 433 int 434 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 435 { 436 struct bridge_softc *sc = ifp->if_softc; 437 struct proc *p = curproc; /* XXX */ 438 union { 439 struct ifbreq ifbreq; 440 struct ifbifconf ifbifconf; 441 struct ifbareq ifbareq; 442 struct ifbaconf ifbaconf; 443 struct ifbrparam ifbrparam; 444 } args; 445 struct ifdrv *ifd = (struct ifdrv *) data; 446 const struct bridge_control *bc; 447 int s, error = 0; 448 449 s = splnet(); 450 451 switch (cmd) { 452 case SIOCGDRVSPEC: 453 case SIOCSDRVSPEC: 454 if (ifd->ifd_cmd >= bridge_control_table_size) { 455 error = EINVAL; 456 break; 457 } 458 bc = &bridge_control_table[ifd->ifd_cmd]; 459 460 if (cmd == SIOCGDRVSPEC && 461 (bc->bc_flags & BC_F_COPYOUT) == 0) 462 return (EINVAL); 463 else if (cmd == SIOCSDRVSPEC && 464 (bc->bc_flags & BC_F_COPYOUT) != 0) 465 return (EINVAL); 466 467 if (bc->bc_flags & BC_F_SUSER) { 468 error = suser(p->p_ucred, &p->p_acflag); 469 if (error) 470 break; 471 } 472 473 if (ifd->ifd_len != bc->bc_argsize || 474 ifd->ifd_len > sizeof(args)) { 475 error = EINVAL; 476 break; 477 } 478 479 if (bc->bc_flags & BC_F_COPYIN) { 480 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 481 if (error) 482 break; 483 } 484 485 error = (*bc->bc_func)(sc, &args); 486 if (error) 487 break; 488 489 if (bc->bc_flags & BC_F_COPYOUT) 490 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 491 492 break; 493 494 case SIOCSIFFLAGS: 495 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 496 /* 497 * If interface is marked down and it is running, 498 * then stop and disable it. 499 */ 500 (*ifp->if_stop)(ifp, 1); 501 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 502 /* 503 * If interface is marked up and it is stopped, then 504 * start it. 505 */ 506 error = (*ifp->if_init)(ifp); 507 } 508 break; 509 510 default: 511 error = ENOTTY; 512 break; 513 } 514 515 splx(s); 516 517 return (error); 518 } 519 520 /* 521 * bridge_lookup_member: 522 * 523 * Lookup a bridge member interface. Must be called at splnet(). 524 */ 525 struct bridge_iflist * 526 bridge_lookup_member(struct bridge_softc *sc, const char *name) 527 { 528 struct bridge_iflist *bif; 529 struct ifnet *ifp; 530 531 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 532 ifp = bif->bif_ifp; 533 if (strcmp(ifp->if_xname, name) == 0) 534 return (bif); 535 } 536 537 return (NULL); 538 } 539 540 /* 541 * bridge_lookup_member_if: 542 * 543 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 544 */ 545 struct bridge_iflist * 546 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 547 { 548 struct bridge_iflist *bif; 549 550 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 551 if (bif->bif_ifp == member_ifp) 552 return (bif); 553 } 554 555 return (NULL); 556 } 557 558 /* 559 * bridge_delete_member: 560 * 561 * Delete the specified member interface. 562 */ 563 void 564 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 565 { 566 struct ifnet *ifs = bif->bif_ifp; 567 568 switch (ifs->if_type) { 569 case IFT_ETHER: 570 /* 571 * Take the interface out of promiscuous mode. 572 */ 573 (void) ifpromisc(ifs, 0); 574 break; 575 576 default: 577 #ifdef DIAGNOSTIC 578 panic("bridge_delete_member: impossible"); 579 #endif 580 break; 581 } 582 583 ifs->if_bridge = NULL; 584 LIST_REMOVE(bif, bif_next); 585 586 bridge_rtdelete(sc, ifs); 587 588 free(bif, M_DEVBUF); 589 590 if (sc->sc_if.if_flags & IFF_RUNNING) 591 bstp_initialization(sc); 592 } 593 594 int 595 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 596 { 597 struct ifbreq *req = arg; 598 struct bridge_iflist *bif = NULL; 599 struct ifnet *ifs; 600 int error = 0; 601 602 ifs = ifunit(req->ifbr_ifsname); 603 if (ifs == NULL) 604 return (ENOENT); 605 606 if (sc->sc_if.if_mtu != ifs->if_mtu) 607 return (EINVAL); 608 609 if (ifs->if_bridge == sc) 610 return (EEXIST); 611 612 if (ifs->if_bridge != NULL) 613 return (EBUSY); 614 615 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 616 if (bif == NULL) 617 return (ENOMEM); 618 619 switch (ifs->if_type) { 620 case IFT_ETHER: 621 /* 622 * Place the interface into promiscuous mode. 623 */ 624 error = ifpromisc(ifs, 1); 625 if (error) 626 goto out; 627 break; 628 629 default: 630 error = EINVAL; 631 goto out; 632 } 633 634 bif->bif_ifp = ifs; 635 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 636 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 637 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 638 639 ifs->if_bridge = sc; 640 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 641 642 if (sc->sc_if.if_flags & IFF_RUNNING) 643 bstp_initialization(sc); 644 else 645 bstp_stop(sc); 646 647 out: 648 if (error) { 649 if (bif != NULL) 650 free(bif, M_DEVBUF); 651 } 652 return (error); 653 } 654 655 int 656 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 657 { 658 struct ifbreq *req = arg; 659 struct bridge_iflist *bif; 660 661 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 662 if (bif == NULL) 663 return (ENOENT); 664 665 bridge_delete_member(sc, bif); 666 667 return (0); 668 } 669 670 int 671 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 672 { 673 struct ifbreq *req = arg; 674 struct bridge_iflist *bif; 675 676 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 677 if (bif == NULL) 678 return (ENOENT); 679 680 req->ifbr_ifsflags = bif->bif_flags; 681 req->ifbr_state = bif->bif_state; 682 req->ifbr_priority = bif->bif_priority; 683 req->ifbr_path_cost = bif->bif_path_cost; 684 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 685 686 return (0); 687 } 688 689 int 690 bridge_ioctl_sifflags(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 if (req->ifbr_ifsflags & IFBIF_STP) { 700 switch (bif->bif_ifp->if_type) { 701 case IFT_ETHER: 702 /* These can do spanning tree. */ 703 break; 704 705 default: 706 /* Nothing else can. */ 707 return (EINVAL); 708 } 709 } 710 711 bif->bif_flags = req->ifbr_ifsflags; 712 713 if (sc->sc_if.if_flags & IFF_RUNNING) 714 bstp_initialization(sc); 715 716 return (0); 717 } 718 719 int 720 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 721 { 722 struct ifbrparam *param = arg; 723 724 sc->sc_brtmax = param->ifbrp_csize; 725 bridge_rttrim(sc); 726 727 return (0); 728 } 729 730 int 731 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 732 { 733 struct ifbrparam *param = arg; 734 735 param->ifbrp_csize = sc->sc_brtmax; 736 737 return (0); 738 } 739 740 int 741 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 742 { 743 struct ifbifconf *bifc = arg; 744 struct bridge_iflist *bif; 745 struct ifbreq breq; 746 int count, len, error = 0; 747 748 count = 0; 749 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 750 count++; 751 752 if (bifc->ifbic_len == 0) { 753 bifc->ifbic_len = sizeof(breq) * count; 754 return (0); 755 } 756 757 count = 0; 758 len = bifc->ifbic_len; 759 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 760 if (len < sizeof(breq)) 761 break; 762 763 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 764 sizeof(breq.ifbr_ifsname)); 765 breq.ifbr_ifsflags = bif->bif_flags; 766 breq.ifbr_state = bif->bif_state; 767 breq.ifbr_priority = bif->bif_priority; 768 breq.ifbr_path_cost = bif->bif_path_cost; 769 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 770 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 771 if (error) 772 break; 773 count++; 774 len -= sizeof(breq); 775 } 776 777 bifc->ifbic_len = sizeof(breq) * count; 778 return (error); 779 } 780 781 int 782 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 783 { 784 struct ifbaconf *bac = arg; 785 struct bridge_rtnode *brt; 786 struct ifbareq bareq; 787 int count = 0, error = 0, len; 788 789 if (bac->ifbac_len == 0) 790 return (0); 791 792 len = bac->ifbac_len; 793 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 794 if (len < sizeof(bareq)) 795 goto out; 796 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 797 sizeof(bareq.ifba_ifsname)); 798 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 799 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 800 bareq.ifba_expire = brt->brt_expire - mono_time.tv_sec; 801 else 802 bareq.ifba_expire = 0; 803 bareq.ifba_flags = brt->brt_flags; 804 805 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 806 if (error) 807 goto out; 808 count++; 809 len -= sizeof(bareq); 810 } 811 out: 812 bac->ifbac_len = sizeof(bareq) * count; 813 return (error); 814 } 815 816 int 817 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 818 { 819 struct ifbareq *req = arg; 820 struct bridge_iflist *bif; 821 int error; 822 823 bif = bridge_lookup_member(sc, req->ifba_ifsname); 824 if (bif == NULL) 825 return (ENOENT); 826 827 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 828 req->ifba_flags); 829 830 return (error); 831 } 832 833 int 834 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 835 { 836 struct ifbrparam *param = arg; 837 838 sc->sc_brttimeout = param->ifbrp_ctime; 839 840 return (0); 841 } 842 843 int 844 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 845 { 846 struct ifbrparam *param = arg; 847 848 param->ifbrp_ctime = sc->sc_brttimeout; 849 850 return (0); 851 } 852 853 int 854 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 855 { 856 struct ifbareq *req = arg; 857 858 return (bridge_rtdaddr(sc, req->ifba_dst)); 859 } 860 861 int 862 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 863 { 864 struct ifbreq *req = arg; 865 866 bridge_rtflush(sc, req->ifbr_ifsflags); 867 868 return (0); 869 } 870 871 int 872 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 873 { 874 struct ifbrparam *param = arg; 875 876 param->ifbrp_prio = sc->sc_bridge_priority; 877 878 return (0); 879 } 880 881 int 882 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 883 { 884 struct ifbrparam *param = arg; 885 886 sc->sc_bridge_priority = param->ifbrp_prio; 887 888 if (sc->sc_if.if_flags & IFF_RUNNING) 889 bstp_initialization(sc); 890 891 return (0); 892 } 893 894 int 895 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 896 { 897 struct ifbrparam *param = arg; 898 899 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 900 901 return (0); 902 } 903 904 int 905 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 906 { 907 struct ifbrparam *param = arg; 908 909 if (param->ifbrp_hellotime == 0) 910 return (EINVAL); 911 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 912 913 if (sc->sc_if.if_flags & IFF_RUNNING) 914 bstp_initialization(sc); 915 916 return (0); 917 } 918 919 int 920 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 921 { 922 struct ifbrparam *param = arg; 923 924 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 925 926 return (0); 927 } 928 929 int 930 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 931 { 932 struct ifbrparam *param = arg; 933 934 if (param->ifbrp_fwddelay == 0) 935 return (EINVAL); 936 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 937 938 if (sc->sc_if.if_flags & IFF_RUNNING) 939 bstp_initialization(sc); 940 941 return (0); 942 } 943 944 int 945 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 946 { 947 struct ifbrparam *param = arg; 948 949 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 950 951 return (0); 952 } 953 954 int 955 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 956 { 957 struct ifbrparam *param = arg; 958 959 if (param->ifbrp_maxage == 0) 960 return (EINVAL); 961 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 962 963 if (sc->sc_if.if_flags & IFF_RUNNING) 964 bstp_initialization(sc); 965 966 return (0); 967 } 968 969 int 970 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 971 { 972 struct ifbreq *req = arg; 973 struct bridge_iflist *bif; 974 975 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 976 if (bif == NULL) 977 return (ENOENT); 978 979 bif->bif_priority = req->ifbr_priority; 980 981 if (sc->sc_if.if_flags & IFF_RUNNING) 982 bstp_initialization(sc); 983 984 return (0); 985 } 986 987 #ifdef BRIDGE_IPF 988 int 989 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 990 { 991 struct ifbrparam *param = arg; 992 993 param->ifbrp_filter = sc->sc_filter_flags; 994 995 return (0); 996 } 997 998 int 999 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1000 { 1001 struct ifbrparam *param = arg; 1002 uint32_t nflags, oflags; 1003 1004 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1005 return (EINVAL); 1006 1007 nflags = param->ifbrp_filter; 1008 oflags = sc->sc_filter_flags; 1009 1010 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1011 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1012 &sc->sc_if.if_pfil); 1013 } 1014 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1015 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1016 &sc->sc_if.if_pfil); 1017 } 1018 1019 sc->sc_filter_flags = nflags; 1020 1021 return (0); 1022 } 1023 #endif /* BRIDGE_IPF */ 1024 1025 int 1026 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1027 { 1028 struct ifbreq *req = arg; 1029 struct bridge_iflist *bif; 1030 1031 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1032 if (bif == NULL) 1033 return (ENOENT); 1034 1035 bif->bif_path_cost = req->ifbr_path_cost; 1036 1037 if (sc->sc_if.if_flags & IFF_RUNNING) 1038 bstp_initialization(sc); 1039 1040 return (0); 1041 } 1042 1043 /* 1044 * bridge_ifdetach: 1045 * 1046 * Detach an interface from a bridge. Called when a member 1047 * interface is detaching. 1048 */ 1049 void 1050 bridge_ifdetach(struct ifnet *ifp) 1051 { 1052 struct bridge_softc *sc = ifp->if_bridge; 1053 struct ifbreq breq; 1054 1055 memset(&breq, 0, sizeof(breq)); 1056 sprintf(breq.ifbr_ifsname, ifp->if_xname); 1057 1058 (void) bridge_ioctl_del(sc, &breq); 1059 } 1060 1061 /* 1062 * bridge_init: 1063 * 1064 * Initialize a bridge interface. 1065 */ 1066 int 1067 bridge_init(struct ifnet *ifp) 1068 { 1069 struct bridge_softc *sc = ifp->if_softc; 1070 1071 if (ifp->if_flags & IFF_RUNNING) 1072 return (0); 1073 1074 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1075 bridge_timer, sc); 1076 1077 ifp->if_flags |= IFF_RUNNING; 1078 bstp_initialization(sc); 1079 return (0); 1080 } 1081 1082 /* 1083 * bridge_stop: 1084 * 1085 * Stop the bridge interface. 1086 */ 1087 void 1088 bridge_stop(struct ifnet *ifp, int disable) 1089 { 1090 struct bridge_softc *sc = ifp->if_softc; 1091 1092 if ((ifp->if_flags & IFF_RUNNING) == 0) 1093 return; 1094 1095 callout_stop(&sc->sc_brcallout); 1096 bstp_stop(sc); 1097 1098 IF_PURGE(&ifp->if_snd); 1099 1100 bridge_rtflush(sc, IFBF_FLUSHDYN); 1101 1102 ifp->if_flags &= ~IFF_RUNNING; 1103 } 1104 1105 /* 1106 * bridge_enqueue: 1107 * 1108 * Enqueue a packet on a bridge member interface. 1109 * 1110 * NOTE: must be called at splnet(). 1111 */ 1112 __inline void 1113 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1114 { 1115 ALTQ_DECL(struct altq_pktattr pktattr;) 1116 int len, error; 1117 short mflags; 1118 1119 #ifdef PFIL_HOOKS 1120 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, dst_ifp, PFIL_OUT) != 0) { 1121 m_freem(m); 1122 return; 1123 } 1124 if (m == NULL) 1125 return; 1126 #endif /* PFIL_HOOKS */ 1127 1128 #ifdef ALTQ 1129 /* 1130 * If ALTQ is enabled on the member interface, do 1131 * classification; the queueing discipline might 1132 * not require classification, but might require 1133 * the address family/header pointer in the pktattr. 1134 */ 1135 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1136 /* XXX IFT_ETHER */ 1137 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1138 } 1139 #endif /* ALTQ */ 1140 1141 len = m->m_pkthdr.len; 1142 mflags = m->m_flags; 1143 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1144 if (error) { 1145 /* mbuf is already freed */ 1146 sc->sc_if.if_oerrors++; 1147 return; 1148 } 1149 1150 sc->sc_if.if_opackets++; 1151 sc->sc_if.if_obytes += len; 1152 1153 dst_ifp->if_obytes += len; 1154 1155 if (mflags & M_MCAST) { 1156 sc->sc_if.if_omcasts++; 1157 dst_ifp->if_omcasts++; 1158 } 1159 1160 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1161 (*dst_ifp->if_start)(dst_ifp); 1162 } 1163 1164 /* 1165 * bridge_output: 1166 * 1167 * Send output from a bridge member interface. This 1168 * performs the bridging function for locally originated 1169 * packets. 1170 * 1171 * The mbuf has the Ethernet header already attached. We must 1172 * enqueue or free the mbuf before returning. 1173 */ 1174 int 1175 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1176 struct rtentry *rt) 1177 { 1178 struct ether_header *eh; 1179 struct ifnet *dst_if; 1180 struct bridge_softc *sc; 1181 int s; 1182 1183 if (m->m_len < ETHER_HDR_LEN) { 1184 m = m_pullup(m, ETHER_HDR_LEN); 1185 if (m == NULL) 1186 return (0); 1187 } 1188 1189 eh = mtod(m, struct ether_header *); 1190 sc = ifp->if_bridge; 1191 1192 s = splnet(); 1193 1194 /* 1195 * If bridge is down, but the original output interface is up, 1196 * go ahead and send out that interface. Otherwise, the packet 1197 * is dropped below. 1198 */ 1199 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1200 dst_if = ifp; 1201 goto sendunicast; 1202 } 1203 1204 /* 1205 * If the packet is a multicast, or we don't know a better way to 1206 * get there, send to all interfaces. 1207 */ 1208 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1209 dst_if = NULL; 1210 else 1211 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1212 if (dst_if == NULL) { 1213 struct bridge_iflist *bif; 1214 struct mbuf *mc; 1215 int used = 0; 1216 1217 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1218 dst_if = bif->bif_ifp; 1219 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1220 continue; 1221 1222 /* 1223 * If this is not the original output interface, 1224 * and the interface is participating in spanning 1225 * tree, make sure the port is in a state that 1226 * allows forwarding. 1227 */ 1228 if (dst_if != ifp && 1229 (bif->bif_flags & IFBIF_STP) != 0) { 1230 switch (bif->bif_state) { 1231 case BSTP_IFSTATE_BLOCKING: 1232 case BSTP_IFSTATE_LISTENING: 1233 case BSTP_IFSTATE_DISABLED: 1234 continue; 1235 } 1236 } 1237 1238 if (LIST_NEXT(bif, bif_next) == NULL) { 1239 used = 1; 1240 mc = m; 1241 } else { 1242 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1243 if (mc == NULL) { 1244 sc->sc_if.if_oerrors++; 1245 continue; 1246 } 1247 } 1248 1249 bridge_enqueue(sc, dst_if, mc); 1250 } 1251 if (used == 0) 1252 m_freem(m); 1253 splx(s); 1254 return (0); 1255 } 1256 1257 sendunicast: 1258 /* 1259 * XXX Spanning tree consideration here? 1260 */ 1261 1262 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1263 m_freem(m); 1264 splx(s); 1265 return (0); 1266 } 1267 1268 bridge_enqueue(sc, dst_if, m); 1269 1270 splx(s); 1271 return (0); 1272 } 1273 1274 /* 1275 * bridge_start: 1276 * 1277 * Start output on a bridge. 1278 * 1279 * NOTE: This routine should never be called in this implementation. 1280 */ 1281 void 1282 bridge_start(struct ifnet *ifp) 1283 { 1284 1285 printf("%s: bridge_start() called\n", ifp->if_xname); 1286 } 1287 1288 /* 1289 * bridge_forward: 1290 * 1291 * The fowarding function of the bridge. 1292 */ 1293 void 1294 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1295 { 1296 struct bridge_iflist *bif; 1297 struct ifnet *src_if, *dst_if; 1298 struct ether_header *eh; 1299 1300 src_if = m->m_pkthdr.rcvif; 1301 1302 sc->sc_if.if_ipackets++; 1303 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1304 1305 /* 1306 * Look up the bridge_iflist. 1307 */ 1308 bif = bridge_lookup_member_if(sc, src_if); 1309 if (bif == NULL) { 1310 /* Interface is not a bridge member (anymore?) */ 1311 m_freem(m); 1312 return; 1313 } 1314 1315 if (bif->bif_flags & IFBIF_STP) { 1316 switch (bif->bif_state) { 1317 case BSTP_IFSTATE_BLOCKING: 1318 case BSTP_IFSTATE_LISTENING: 1319 case BSTP_IFSTATE_DISABLED: 1320 m_freem(m); 1321 return; 1322 } 1323 } 1324 1325 eh = mtod(m, struct ether_header *); 1326 1327 /* 1328 * If the interface is learning, and the source 1329 * address is valid and not multicast, record 1330 * the address. 1331 */ 1332 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1333 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1334 (eh->ether_shost[0] == 0 && 1335 eh->ether_shost[1] == 0 && 1336 eh->ether_shost[2] == 0 && 1337 eh->ether_shost[3] == 0 && 1338 eh->ether_shost[4] == 0 && 1339 eh->ether_shost[5] == 0) == 0) { 1340 (void) bridge_rtupdate(sc, eh->ether_shost, 1341 src_if, 0, IFBAF_DYNAMIC); 1342 } 1343 1344 if ((bif->bif_flags & IFBIF_STP) != 0 && 1345 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1346 m_freem(m); 1347 return; 1348 } 1349 1350 /* 1351 * At this point, the port either doesn't participate 1352 * in spanning tree or it is in the forwarding state. 1353 */ 1354 1355 /* 1356 * If the packet is unicast, destined for someone on 1357 * "this" side of the bridge, drop it. 1358 */ 1359 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1360 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1361 if (src_if == dst_if) { 1362 m_freem(m); 1363 return; 1364 } 1365 } else { 1366 /* ...forward it to all interfaces. */ 1367 sc->sc_if.if_imcasts++; 1368 dst_if = NULL; 1369 } 1370 1371 #ifdef PFIL_HOOKS 1372 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1373 m_freem(m); 1374 return; 1375 } 1376 if (m == NULL) 1377 return; 1378 #endif /* PFIL_HOOKS */ 1379 1380 if (dst_if == NULL) { 1381 bridge_broadcast(sc, src_if, m); 1382 return; 1383 } 1384 1385 /* 1386 * At this point, we're dealing with a unicast frame 1387 * going to a different interface. 1388 */ 1389 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1390 m_freem(m); 1391 return; 1392 } 1393 bif = bridge_lookup_member_if(sc, dst_if); 1394 if (bif == NULL) { 1395 /* Not a member of the bridge (anymore?) */ 1396 m_freem(m); 1397 return; 1398 } 1399 1400 if (bif->bif_flags & IFBIF_STP) { 1401 switch (bif->bif_state) { 1402 case BSTP_IFSTATE_DISABLED: 1403 case BSTP_IFSTATE_BLOCKING: 1404 m_freem(m); 1405 return; 1406 } 1407 } 1408 1409 bridge_enqueue(sc, dst_if, m); 1410 } 1411 1412 /* 1413 * bridge_input: 1414 * 1415 * Receive input from a member interface. Queue the packet for 1416 * bridging if it is not for us. 1417 */ 1418 struct mbuf * 1419 bridge_input(struct ifnet *ifp, struct mbuf *m) 1420 { 1421 struct bridge_softc *sc = ifp->if_bridge; 1422 struct bridge_iflist *bif; 1423 struct ether_header *eh; 1424 struct mbuf *mc; 1425 1426 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1427 return (m); 1428 1429 bif = bridge_lookup_member_if(sc, ifp); 1430 if (bif == NULL) 1431 return (m); 1432 1433 eh = mtod(m, struct ether_header *); 1434 1435 if (m->m_flags & (M_BCAST|M_MCAST)) { 1436 /* Tap off 802.1D packets; they do not get forwarded. */ 1437 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1438 ETHER_ADDR_LEN) == 0) { 1439 m = bstp_input(ifp, m); 1440 if (m == NULL) 1441 return (NULL); 1442 } 1443 1444 if (bif->bif_flags & IFBIF_STP) { 1445 switch (bif->bif_state) { 1446 case BSTP_IFSTATE_BLOCKING: 1447 case BSTP_IFSTATE_LISTENING: 1448 case BSTP_IFSTATE_DISABLED: 1449 return (m); 1450 } 1451 } 1452 1453 /* 1454 * Make a deep copy of the packet and enqueue the copy 1455 * for bridge processing; return the original packet for 1456 * local processing. 1457 */ 1458 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1459 if (mc == NULL) 1460 return (m); 1461 1462 /* Perform the bridge forwarding function with the copy. */ 1463 bridge_forward(sc, mc); 1464 1465 /* Return the original packet for local processing. */ 1466 return (m); 1467 } 1468 1469 if (bif->bif_flags & IFBIF_STP) { 1470 switch (bif->bif_state) { 1471 case BSTP_IFSTATE_BLOCKING: 1472 case BSTP_IFSTATE_LISTENING: 1473 case BSTP_IFSTATE_DISABLED: 1474 return (m); 1475 } 1476 } 1477 1478 /* 1479 * Unicast. Make sure it's not for us. 1480 */ 1481 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1482 /* It is destined for us. */ 1483 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1484 ETHER_ADDR_LEN) == 0) { 1485 if (bif->bif_flags & IFBIF_LEARNING) 1486 (void) bridge_rtupdate(sc, 1487 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1488 m->m_pkthdr.rcvif = bif->bif_ifp; 1489 return (m); 1490 } 1491 1492 /* We just received a packet that we sent out. */ 1493 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1494 ETHER_ADDR_LEN) == 0) { 1495 m_freem(m); 1496 return (NULL); 1497 } 1498 } 1499 1500 /* Perform the bridge forwarding function. */ 1501 bridge_forward(sc, m); 1502 1503 return (NULL); 1504 } 1505 1506 /* 1507 * bridge_broadcast: 1508 * 1509 * Send a frame to all interfaces that are members of 1510 * the bridge, except for the one on which the packet 1511 * arrived. 1512 */ 1513 void 1514 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1515 struct mbuf *m) 1516 { 1517 struct bridge_iflist *bif; 1518 struct mbuf *mc; 1519 struct ifnet *dst_if; 1520 int used = 0; 1521 1522 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1523 dst_if = bif->bif_ifp; 1524 if (dst_if == src_if) 1525 continue; 1526 1527 if (bif->bif_flags & IFBIF_STP) { 1528 switch (bif->bif_state) { 1529 case BSTP_IFSTATE_BLOCKING: 1530 case BSTP_IFSTATE_DISABLED: 1531 continue; 1532 } 1533 } 1534 1535 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1536 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1537 continue; 1538 1539 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1540 continue; 1541 1542 if (LIST_NEXT(bif, bif_next) == NULL) { 1543 mc = m; 1544 used = 1; 1545 } else { 1546 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1547 if (mc == NULL) { 1548 sc->sc_if.if_oerrors++; 1549 continue; 1550 } 1551 } 1552 1553 bridge_enqueue(sc, dst_if, mc); 1554 } 1555 if (used == 0) 1556 m_freem(m); 1557 } 1558 1559 /* 1560 * bridge_rtupdate: 1561 * 1562 * Add a bridge routing entry. 1563 */ 1564 int 1565 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1566 struct ifnet *dst_if, int setflags, uint8_t flags) 1567 { 1568 struct bridge_rtnode *brt; 1569 int error; 1570 1571 /* 1572 * A route for this destination might already exist. If so, 1573 * update it, otherwise create a new one. 1574 */ 1575 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1576 if (sc->sc_brtcnt >= sc->sc_brtmax) 1577 return (ENOSPC); 1578 1579 /* 1580 * Allocate a new bridge forwarding node, and 1581 * initialize the expiration time and Ethernet 1582 * address. 1583 */ 1584 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1585 if (brt == NULL) 1586 return (ENOMEM); 1587 1588 memset(brt, 0, sizeof(*brt)); 1589 brt->brt_expire = mono_time.tv_sec + sc->sc_brttimeout; 1590 brt->brt_flags = IFBAF_DYNAMIC; 1591 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1592 1593 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1594 pool_put(&bridge_rtnode_pool, brt); 1595 return (error); 1596 } 1597 } 1598 1599 brt->brt_ifp = dst_if; 1600 if (setflags) { 1601 brt->brt_flags = flags; 1602 brt->brt_expire = (flags & IFBAF_STATIC) ? 0 : 1603 mono_time.tv_sec + sc->sc_brttimeout; 1604 } 1605 1606 return (0); 1607 } 1608 1609 /* 1610 * bridge_rtlookup: 1611 * 1612 * Lookup the destination interface for an address. 1613 */ 1614 struct ifnet * 1615 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1616 { 1617 struct bridge_rtnode *brt; 1618 1619 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1620 return (NULL); 1621 1622 return (brt->brt_ifp); 1623 } 1624 1625 /* 1626 * bridge_rttrim: 1627 * 1628 * Trim the routine table so that we have a number 1629 * of routing entries less than or equal to the 1630 * maximum number. 1631 */ 1632 void 1633 bridge_rttrim(struct bridge_softc *sc) 1634 { 1635 struct bridge_rtnode *brt, *nbrt; 1636 1637 /* Make sure we actually need to do this. */ 1638 if (sc->sc_brtcnt <= sc->sc_brtmax) 1639 return; 1640 1641 /* Force an aging cycle; this might trim enough addresses. */ 1642 bridge_rtage(sc); 1643 if (sc->sc_brtcnt <= sc->sc_brtmax) 1644 return; 1645 1646 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1647 nbrt = LIST_NEXT(brt, brt_list); 1648 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1649 bridge_rtnode_destroy(sc, brt); 1650 if (sc->sc_brtcnt <= sc->sc_brtmax) 1651 return; 1652 } 1653 } 1654 } 1655 1656 /* 1657 * bridge_timer: 1658 * 1659 * Aging timer for the bridge. 1660 */ 1661 void 1662 bridge_timer(void *arg) 1663 { 1664 struct bridge_softc *sc = arg; 1665 int s; 1666 1667 s = splnet(); 1668 bridge_rtage(sc); 1669 splx(s); 1670 1671 if (sc->sc_if.if_flags & IFF_RUNNING) 1672 callout_reset(&sc->sc_brcallout, 1673 bridge_rtable_prune_period * hz, bridge_timer, sc); 1674 } 1675 1676 /* 1677 * bridge_rtage: 1678 * 1679 * Perform an aging cycle. 1680 */ 1681 void 1682 bridge_rtage(struct bridge_softc *sc) 1683 { 1684 struct bridge_rtnode *brt, *nbrt; 1685 1686 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1687 nbrt = LIST_NEXT(brt, brt_list); 1688 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1689 if (mono_time.tv_sec >= brt->brt_expire) 1690 bridge_rtnode_destroy(sc, brt); 1691 } 1692 } 1693 } 1694 1695 /* 1696 * bridge_rtflush: 1697 * 1698 * Remove all dynamic addresses from the bridge. 1699 */ 1700 void 1701 bridge_rtflush(struct bridge_softc *sc, int full) 1702 { 1703 struct bridge_rtnode *brt, *nbrt; 1704 1705 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1706 nbrt = LIST_NEXT(brt, brt_list); 1707 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1708 bridge_rtnode_destroy(sc, brt); 1709 } 1710 } 1711 1712 /* 1713 * bridge_rtdaddr: 1714 * 1715 * Remove an address from the table. 1716 */ 1717 int 1718 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1719 { 1720 struct bridge_rtnode *brt; 1721 1722 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1723 return (ENOENT); 1724 1725 bridge_rtnode_destroy(sc, brt); 1726 return (0); 1727 } 1728 1729 /* 1730 * bridge_rtdelete: 1731 * 1732 * Delete routes to a speicifc member interface. 1733 */ 1734 void 1735 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1736 { 1737 struct bridge_rtnode *brt, *nbrt; 1738 1739 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1740 nbrt = LIST_NEXT(brt, brt_list); 1741 if (brt->brt_ifp == ifp) 1742 bridge_rtnode_destroy(sc, brt); 1743 } 1744 } 1745 1746 /* 1747 * bridge_rtable_init: 1748 * 1749 * Initialize the route table for this bridge. 1750 */ 1751 int 1752 bridge_rtable_init(struct bridge_softc *sc) 1753 { 1754 int i; 1755 1756 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1757 M_DEVBUF, M_NOWAIT); 1758 if (sc->sc_rthash == NULL) 1759 return (ENOMEM); 1760 1761 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1762 LIST_INIT(&sc->sc_rthash[i]); 1763 1764 sc->sc_rthash_key = arc4random(); 1765 1766 LIST_INIT(&sc->sc_rtlist); 1767 1768 return (0); 1769 } 1770 1771 /* 1772 * bridge_rtable_fini: 1773 * 1774 * Deconstruct the route table for this bridge. 1775 */ 1776 void 1777 bridge_rtable_fini(struct bridge_softc *sc) 1778 { 1779 1780 free(sc->sc_rthash, M_DEVBUF); 1781 } 1782 1783 /* 1784 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1785 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1786 */ 1787 #define mix(a, b, c) \ 1788 do { \ 1789 a -= b; a -= c; a ^= (c >> 13); \ 1790 b -= c; b -= a; b ^= (a << 8); \ 1791 c -= a; c -= b; c ^= (b >> 13); \ 1792 a -= b; a -= c; a ^= (c >> 12); \ 1793 b -= c; b -= a; b ^= (a << 16); \ 1794 c -= a; c -= b; c ^= (b >> 5); \ 1795 a -= b; a -= c; a ^= (c >> 3); \ 1796 b -= c; b -= a; b ^= (a << 10); \ 1797 c -= a; c -= b; c ^= (b >> 15); \ 1798 } while (/*CONSTCOND*/0) 1799 1800 static __inline uint32_t 1801 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1802 { 1803 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1804 1805 b += addr[5] << 8; 1806 b += addr[4]; 1807 a += addr[3] << 24; 1808 a += addr[2] << 16; 1809 a += addr[1] << 8; 1810 a += addr[0]; 1811 1812 mix(a, b, c); 1813 1814 return (c & BRIDGE_RTHASH_MASK); 1815 } 1816 1817 #undef mix 1818 1819 /* 1820 * bridge_rtnode_lookup: 1821 * 1822 * Look up a bridge route node for the specified destination. 1823 */ 1824 struct bridge_rtnode * 1825 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1826 { 1827 struct bridge_rtnode *brt; 1828 uint32_t hash; 1829 int dir; 1830 1831 hash = bridge_rthash(sc, addr); 1832 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1833 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1834 if (dir == 0) 1835 return (brt); 1836 if (dir > 0) 1837 return (NULL); 1838 } 1839 1840 return (NULL); 1841 } 1842 1843 /* 1844 * bridge_rtnode_insert: 1845 * 1846 * Insert the specified bridge node into the route table. We 1847 * assume the entry is not already in the table. 1848 */ 1849 int 1850 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1851 { 1852 struct bridge_rtnode *lbrt; 1853 uint32_t hash; 1854 int dir; 1855 1856 hash = bridge_rthash(sc, brt->brt_addr); 1857 1858 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1859 if (lbrt == NULL) { 1860 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1861 goto out; 1862 } 1863 1864 do { 1865 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1866 if (dir == 0) 1867 return (EEXIST); 1868 if (dir > 0) { 1869 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1870 goto out; 1871 } 1872 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1873 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1874 goto out; 1875 } 1876 lbrt = LIST_NEXT(lbrt, brt_hash); 1877 } while (lbrt != NULL); 1878 1879 #ifdef DIAGNOSTIC 1880 panic("bridge_rtnode_insert: impossible"); 1881 #endif 1882 1883 out: 1884 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1885 sc->sc_brtcnt++; 1886 1887 return (0); 1888 } 1889 1890 /* 1891 * bridge_rtnode_destroy: 1892 * 1893 * Destroy a bridge rtnode. 1894 */ 1895 void 1896 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1897 { 1898 1899 LIST_REMOVE(brt, brt_hash); 1900 1901 LIST_REMOVE(brt, brt_list); 1902 sc->sc_brtcnt--; 1903 pool_put(&bridge_rtnode_pool, brt); 1904 } 1905 1906 #ifdef BRIDGE_IPF 1907 extern struct pfil_head inet_pfil_hook; /* XXX */ 1908 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1909 1910 /* 1911 * Send bridge packets through IPF if they are one of the types IPF can deal 1912 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1913 * question.) 1914 */ 1915 static int bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1916 { 1917 int snap, error; 1918 struct ether_header *eh; 1919 struct mbuf *m1, *m2; 1920 u_int16_t ether_type; 1921 1922 snap = 0; 1923 error = -1; /* Default error if not error == 0 */ 1924 eh = mtod(*mp, struct ether_header *); 1925 ether_type = ntohs(eh->ether_type); 1926 1927 /* 1928 * Check for SNAP/LLC. 1929 */ 1930 if (ether_type < ETHERMTU) { 1931 struct llc *llc = (struct llc *)(eh + 1); 1932 1933 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1934 llc->llc_dsap == LLC_SNAP_LSAP && 1935 llc->llc_ssap == LLC_SNAP_LSAP && 1936 llc->llc_control == LLC_UI) { 1937 ether_type = htons(llc->llc_un.type_snap.ether_type); 1938 snap = 1; 1939 } 1940 } 1941 1942 /* 1943 * If we're trying to filter bridge traffic, don't look at anything 1944 * other than IP and ARP traffic. If the filter doesn't understand 1945 * IPv6, don't allow IPv6 through the bridge either. This is lame 1946 * since if we really wanted, say, an AppleTalk filter, we are hosed, 1947 * but of course we don't have an AppleTalk filter to begin with. 1948 * (Note that since IPF doesn't understand ARP it will pass *ALL* 1949 * ARP traffic.) 1950 */ 1951 switch (ether_type) { 1952 case ETHERTYPE_ARP: 1953 case ETHERTYPE_REVARP: 1954 return 0; /* Automatically pass */ 1955 case ETHERTYPE_IP: 1956 # ifdef INET6 1957 case ETHERTYPE_IPV6: 1958 # endif /* INET6 */ 1959 break; 1960 default: 1961 goto bad; 1962 } 1963 1964 /* Strip off the Ethernet header---but keep a copy. */ 1965 if ((m1 = m_split(*mp, sizeof(struct ether_header), M_NOWAIT)) == NULL) 1966 goto bad; 1967 /* Strip off snap header, if present */ 1968 if (snap) { 1969 if ((m2 = m_split(m1, sizeof(struct llc), M_NOWAIT)) == NULL) 1970 goto bad2; 1971 } else 1972 m2 = m1; 1973 1974 /* 1975 * Check basic packet sanity, if the packet is outbound, and 1976 * run IPF filter. 1977 */ 1978 if (ether_type == ETHERTYPE_IP && 1979 (dir == PFIL_OUT || bridge_ip_checkbasic(&m2) == 0)) { 1980 error = pfil_run_hooks(&inet_pfil_hook, &m2, ifp, dir); 1981 if (error) goto bad2; 1982 } 1983 # ifdef INET6 1984 if (ether_type == ETHERTYPE_IPV6 && 1985 (dir == PFIL_OUT || bridge_ip6_checkbasic(&m2) == 0)) { 1986 error = pfil_run_hooks(&inet6_pfil_hook, &m2, ifp, dir); 1987 if (error) goto bad2; 1988 } 1989 # endif 1990 if (m2 == NULL) goto bad2; 1991 1992 /* 1993 * Finally, put everything back the way it was and return 1994 */ 1995 if (snap) 1996 m_cat(m1, m2); 1997 else 1998 m1 = m2; 1999 m_cat(*mp, m1); 2000 return 0; 2001 2002 2003 bad2: 2004 if (snap) 2005 m_freem(m1); 2006 m_freem(m2); 2007 bad: 2008 m_freem(*mp); 2009 *mp = NULL; 2010 return error; 2011 } 2012 2013 /* 2014 * Perform basic checks on header size since 2015 * IPF assumes ip_input has already processed 2016 * it for it. Cut-and-pasted from ip_input.c. 2017 * Given how simple the IPv6 version is, 2018 * does the IPv4 version really need to be 2019 * this complicated? 2020 * 2021 * XXX Should we update ipstat here, or not? 2022 * XXX Right now we update ipstat but not 2023 * XXX csum_counter. 2024 */ 2025 static int 2026 bridge_ip_checkbasic(struct mbuf **mp) 2027 { 2028 struct mbuf *m = *mp; 2029 struct ip *ip; 2030 int len, hlen; 2031 2032 if (*mp == NULL) 2033 return -1; 2034 2035 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2036 if ((m = m_copyup(m, sizeof(struct ip), 2037 (max_linkhdr + 3) & ~3)) == NULL) { 2038 /* XXXJRT new stat, please */ 2039 ipstat.ips_toosmall++; 2040 goto bad; 2041 } 2042 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2043 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2044 ipstat.ips_toosmall++; 2045 goto bad; 2046 } 2047 } 2048 ip = mtod(m, struct ip *); 2049 if (ip == NULL) goto bad; 2050 2051 if (ip->ip_v != IPVERSION) { 2052 ipstat.ips_badvers++; 2053 goto bad; 2054 } 2055 hlen = ip->ip_hl << 2; 2056 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2057 ipstat.ips_badhlen++; 2058 goto bad; 2059 } 2060 if (hlen > m->m_len) { 2061 if ((m = m_pullup(m, hlen)) == 0) { 2062 ipstat.ips_badhlen++; 2063 goto bad; 2064 } 2065 ip = mtod(m, struct ip *); 2066 if (ip == NULL) goto bad; 2067 } 2068 2069 switch (m->m_pkthdr.csum_flags & 2070 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2071 M_CSUM_IPv4_BAD)) { 2072 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2073 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2074 goto bad; 2075 2076 case M_CSUM_IPv4: 2077 /* Checksum was okay. */ 2078 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2079 break; 2080 2081 default: 2082 /* Must compute it ourselves. */ 2083 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2084 if (in_cksum(m, hlen) != 0) 2085 goto bad; 2086 break; 2087 } 2088 2089 /* Retrieve the packet length. */ 2090 len = ntohs(ip->ip_len); 2091 2092 /* 2093 * Check for additional length bogosity 2094 */ 2095 if (len < hlen) { 2096 ipstat.ips_badlen++; 2097 goto bad; 2098 } 2099 2100 /* 2101 * Check that the amount of data in the buffers 2102 * is as at least much as the IP header would have us expect. 2103 * Drop packet if shorter than we expect. 2104 */ 2105 if (m->m_pkthdr.len < len) { 2106 ipstat.ips_tooshort++; 2107 goto bad; 2108 } 2109 2110 /* Checks out, proceed */ 2111 *mp = m; 2112 return 0; 2113 2114 bad: 2115 *mp = m; 2116 return -1; 2117 } 2118 2119 # ifdef INET6 2120 /* 2121 * Same as above, but for IPv6. 2122 * Cut-and-pasted from ip6_input.c. 2123 * XXX Should we update ip6stat, or not? 2124 */ 2125 static int 2126 bridge_ip6_checkbasic(struct mbuf **mp) 2127 { 2128 struct mbuf *m = *mp; 2129 struct ip6 *ip6; 2130 2131 /* 2132 * If the IPv6 header is not aligned, slurp it up into a new 2133 * mbuf with space for link headers, in the event we forward 2134 * it. Otherwise, if it is aligned, make sure the entire base 2135 * IPv6 header is in the first mbuf of the chain. 2136 */ 2137 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2138 struct ifnet *inifp = m->m_pkthdr.rcvif; 2139 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2140 (max_linkhdr + 3) & ~3)) == NULL) { 2141 /* XXXJRT new stat, please */ 2142 ip6stat.ip6s_toosmall++; 2143 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2144 goto bad; 2145 } 2146 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2147 struct ifnet *inifp = m->m_pkthdr.rcvif; 2148 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2149 ip6stat.ip6s_toosmall++; 2150 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2151 goto bad; 2152 } 2153 } 2154 2155 ip6 = mtod(m, struct ip6_hdr *); 2156 2157 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2158 ip6stat.ip6s_badvers++; 2159 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2160 goto bad; 2161 } 2162 2163 /* Checks out, proceed */ 2164 *mp = m; 2165 return 0; 2166 2167 bad: 2168 *mp = m; 2169 return -1; 2170 } 2171 # endif /* INET6 */ 2172 #endif /* BRIDGE_IPF */ 2173
Indexes created Thu Oct 02 14:10:14 GMT 2025