if_bridge.c revision 1.22.2.2
1 /* $NetBSD: if_bridge.c,v 1.22.2.2 2006/01/09 13:31:22 tron Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.22.2.2 2006/01/09 13:31:22 tron Exp $"); 84 85 #include "opt_bridge_ipf.h" 86 #include "opt_inet.h" 87 #include "opt_pfil_hooks.h" 88 #include "bpfilter.h" 89 90 #include <sys/param.h> 91 #include <sys/kernel.h> 92 #include <sys/mbuf.h> 93 #include <sys/queue.h> 94 #include <sys/socket.h> 95 #include <sys/sockio.h> 96 #include <sys/systm.h> 97 #include <sys/proc.h> 98 #include <sys/pool.h> 99 100 #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 error = EINVAL; 463 break; 464 } 465 else if (cmd == SIOCSDRVSPEC && 466 (bc->bc_flags & BC_F_COPYOUT) != 0) { 467 error = EINVAL; 468 break; 469 } 470 471 if (bc->bc_flags & BC_F_SUSER) { 472 error = suser(p->p_ucred, &p->p_acflag); 473 if (error) 474 break; 475 } 476 477 if (ifd->ifd_len != bc->bc_argsize || 478 ifd->ifd_len > sizeof(args)) { 479 error = EINVAL; 480 break; 481 } 482 483 memset(&args, 0, sizeof(args)); 484 if (bc->bc_flags & BC_F_COPYIN) { 485 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 486 if (error) 487 break; 488 } 489 490 error = (*bc->bc_func)(sc, &args); 491 if (error) 492 break; 493 494 if (bc->bc_flags & BC_F_COPYOUT) 495 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 496 497 break; 498 499 case SIOCSIFFLAGS: 500 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 501 /* 502 * If interface is marked down and it is running, 503 * then stop and disable it. 504 */ 505 (*ifp->if_stop)(ifp, 1); 506 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 507 /* 508 * If interface is marked up and it is stopped, then 509 * start it. 510 */ 511 error = (*ifp->if_init)(ifp); 512 } 513 break; 514 515 default: 516 error = ENOTTY; 517 break; 518 } 519 520 splx(s); 521 522 return (error); 523 } 524 525 /* 526 * bridge_lookup_member: 527 * 528 * Lookup a bridge member interface. Must be called at splnet(). 529 */ 530 struct bridge_iflist * 531 bridge_lookup_member(struct bridge_softc *sc, const char *name) 532 { 533 struct bridge_iflist *bif; 534 struct ifnet *ifp; 535 536 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 537 ifp = bif->bif_ifp; 538 if (strcmp(ifp->if_xname, name) == 0) 539 return (bif); 540 } 541 542 return (NULL); 543 } 544 545 /* 546 * bridge_lookup_member_if: 547 * 548 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 549 */ 550 struct bridge_iflist * 551 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 552 { 553 struct bridge_iflist *bif; 554 555 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 556 if (bif->bif_ifp == member_ifp) 557 return (bif); 558 } 559 560 return (NULL); 561 } 562 563 /* 564 * bridge_delete_member: 565 * 566 * Delete the specified member interface. 567 */ 568 void 569 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 570 { 571 struct ifnet *ifs = bif->bif_ifp; 572 573 switch (ifs->if_type) { 574 case IFT_ETHER: 575 /* 576 * Take the interface out of promiscuous mode. 577 */ 578 (void) ifpromisc(ifs, 0); 579 break; 580 581 default: 582 #ifdef DIAGNOSTIC 583 panic("bridge_delete_member: impossible"); 584 #endif 585 break; 586 } 587 588 ifs->if_bridge = NULL; 589 LIST_REMOVE(bif, bif_next); 590 591 bridge_rtdelete(sc, ifs); 592 593 free(bif, M_DEVBUF); 594 595 if (sc->sc_if.if_flags & IFF_RUNNING) 596 bstp_initialization(sc); 597 } 598 599 int 600 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 601 { 602 struct ifbreq *req = arg; 603 struct bridge_iflist *bif = NULL; 604 struct ifnet *ifs; 605 int error = 0; 606 607 ifs = ifunit(req->ifbr_ifsname); 608 if (ifs == NULL) 609 return (ENOENT); 610 611 if (sc->sc_if.if_mtu != ifs->if_mtu) 612 return (EINVAL); 613 614 if (ifs->if_bridge == sc) 615 return (EEXIST); 616 617 if (ifs->if_bridge != NULL) 618 return (EBUSY); 619 620 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 621 if (bif == NULL) 622 return (ENOMEM); 623 624 switch (ifs->if_type) { 625 case IFT_ETHER: 626 /* 627 * Place the interface into promiscuous mode. 628 */ 629 error = ifpromisc(ifs, 1); 630 if (error) 631 goto out; 632 break; 633 634 default: 635 error = EINVAL; 636 goto out; 637 } 638 639 bif->bif_ifp = ifs; 640 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 641 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 642 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 643 644 ifs->if_bridge = sc; 645 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 646 647 if (sc->sc_if.if_flags & IFF_RUNNING) 648 bstp_initialization(sc); 649 else 650 bstp_stop(sc); 651 652 out: 653 if (error) { 654 if (bif != NULL) 655 free(bif, M_DEVBUF); 656 } 657 return (error); 658 } 659 660 int 661 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 662 { 663 struct ifbreq *req = arg; 664 struct bridge_iflist *bif; 665 666 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 667 if (bif == NULL) 668 return (ENOENT); 669 670 bridge_delete_member(sc, bif); 671 672 return (0); 673 } 674 675 int 676 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 677 { 678 struct ifbreq *req = arg; 679 struct bridge_iflist *bif; 680 681 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 682 if (bif == NULL) 683 return (ENOENT); 684 685 req->ifbr_ifsflags = bif->bif_flags; 686 req->ifbr_state = bif->bif_state; 687 req->ifbr_priority = bif->bif_priority; 688 req->ifbr_path_cost = bif->bif_path_cost; 689 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 690 691 return (0); 692 } 693 694 int 695 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 696 { 697 struct ifbreq *req = arg; 698 struct bridge_iflist *bif; 699 700 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 701 if (bif == NULL) 702 return (ENOENT); 703 704 if (req->ifbr_ifsflags & IFBIF_STP) { 705 switch (bif->bif_ifp->if_type) { 706 case IFT_ETHER: 707 /* These can do spanning tree. */ 708 break; 709 710 default: 711 /* Nothing else can. */ 712 return (EINVAL); 713 } 714 } 715 716 bif->bif_flags = req->ifbr_ifsflags; 717 718 if (sc->sc_if.if_flags & IFF_RUNNING) 719 bstp_initialization(sc); 720 721 return (0); 722 } 723 724 int 725 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 726 { 727 struct ifbrparam *param = arg; 728 729 sc->sc_brtmax = param->ifbrp_csize; 730 bridge_rttrim(sc); 731 732 return (0); 733 } 734 735 int 736 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 737 { 738 struct ifbrparam *param = arg; 739 740 param->ifbrp_csize = sc->sc_brtmax; 741 742 return (0); 743 } 744 745 int 746 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 747 { 748 struct ifbifconf *bifc = arg; 749 struct bridge_iflist *bif; 750 struct ifbreq breq; 751 int count, len, error = 0; 752 753 count = 0; 754 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 755 count++; 756 757 if (bifc->ifbic_len == 0) { 758 bifc->ifbic_len = sizeof(breq) * count; 759 return (0); 760 } 761 762 count = 0; 763 len = bifc->ifbic_len; 764 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 765 if (len < sizeof(breq)) 766 break; 767 768 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 769 sizeof(breq.ifbr_ifsname)); 770 breq.ifbr_ifsflags = bif->bif_flags; 771 breq.ifbr_state = bif->bif_state; 772 breq.ifbr_priority = bif->bif_priority; 773 breq.ifbr_path_cost = bif->bif_path_cost; 774 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 775 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 776 if (error) 777 break; 778 count++; 779 len -= sizeof(breq); 780 } 781 782 bifc->ifbic_len = sizeof(breq) * count; 783 return (error); 784 } 785 786 int 787 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 788 { 789 struct ifbaconf *bac = arg; 790 struct bridge_rtnode *brt; 791 struct ifbareq bareq; 792 int count = 0, error = 0, len; 793 794 if (bac->ifbac_len == 0) 795 return (0); 796 797 len = bac->ifbac_len; 798 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 799 if (len < sizeof(bareq)) 800 goto out; 801 memset(&bareq, 0, sizeof(bareq)); 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 int runfilt) 1121 { 1122 ALTQ_DECL(struct altq_pktattr pktattr;) 1123 int len, error; 1124 short mflags; 1125 1126 /* 1127 * Clear any in-bound checksum flags for this packet. 1128 */ 1129 m->m_pkthdr.csum_flags = 0; 1130 1131 #ifdef PFIL_HOOKS 1132 if (runfilt) { 1133 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1134 dst_ifp, PFIL_OUT) != 0) { 1135 if (m != NULL) 1136 m_freem(m); 1137 return; 1138 } 1139 if (m == NULL) 1140 return; 1141 } 1142 #endif /* PFIL_HOOKS */ 1143 1144 #ifdef ALTQ 1145 /* 1146 * If ALTQ is enabled on the member interface, do 1147 * classification; the queueing discipline might 1148 * not require classification, but might require 1149 * the address family/header pointer in the pktattr. 1150 */ 1151 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1152 /* XXX IFT_ETHER */ 1153 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1154 } 1155 #endif /* ALTQ */ 1156 1157 len = m->m_pkthdr.len; 1158 mflags = m->m_flags; 1159 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1160 if (error) { 1161 /* mbuf is already freed */ 1162 sc->sc_if.if_oerrors++; 1163 return; 1164 } 1165 1166 sc->sc_if.if_opackets++; 1167 sc->sc_if.if_obytes += len; 1168 1169 dst_ifp->if_obytes += len; 1170 1171 if (mflags & M_MCAST) { 1172 sc->sc_if.if_omcasts++; 1173 dst_ifp->if_omcasts++; 1174 } 1175 1176 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1177 (*dst_ifp->if_start)(dst_ifp); 1178 } 1179 1180 /* 1181 * bridge_output: 1182 * 1183 * Send output from a bridge member interface. This 1184 * performs the bridging function for locally originated 1185 * packets. 1186 * 1187 * The mbuf has the Ethernet header already attached. We must 1188 * enqueue or free the mbuf before returning. 1189 */ 1190 int 1191 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1192 struct rtentry *rt) 1193 { 1194 struct ether_header *eh; 1195 struct ifnet *dst_if; 1196 struct bridge_softc *sc; 1197 int s; 1198 1199 if (m->m_len < ETHER_HDR_LEN) { 1200 m = m_pullup(m, ETHER_HDR_LEN); 1201 if (m == NULL) 1202 return (0); 1203 } 1204 1205 eh = mtod(m, struct ether_header *); 1206 sc = ifp->if_bridge; 1207 1208 s = splnet(); 1209 1210 /* 1211 * If bridge is down, but the original output interface is up, 1212 * go ahead and send out that interface. Otherwise, the packet 1213 * is dropped below. 1214 */ 1215 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1216 dst_if = ifp; 1217 goto sendunicast; 1218 } 1219 1220 /* 1221 * If the packet is a multicast, or we don't know a better way to 1222 * get there, send to all interfaces. 1223 */ 1224 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1225 dst_if = NULL; 1226 else 1227 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1228 if (dst_if == NULL) { 1229 struct bridge_iflist *bif; 1230 struct mbuf *mc; 1231 int used = 0; 1232 1233 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1234 dst_if = bif->bif_ifp; 1235 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1236 continue; 1237 1238 /* 1239 * If this is not the original output interface, 1240 * and the interface is participating in spanning 1241 * tree, make sure the port is in a state that 1242 * allows forwarding. 1243 */ 1244 if (dst_if != ifp && 1245 (bif->bif_flags & IFBIF_STP) != 0) { 1246 switch (bif->bif_state) { 1247 case BSTP_IFSTATE_BLOCKING: 1248 case BSTP_IFSTATE_LISTENING: 1249 case BSTP_IFSTATE_DISABLED: 1250 continue; 1251 } 1252 } 1253 1254 if (LIST_NEXT(bif, bif_next) == NULL) { 1255 used = 1; 1256 mc = m; 1257 } else { 1258 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1259 if (mc == NULL) { 1260 sc->sc_if.if_oerrors++; 1261 continue; 1262 } 1263 } 1264 1265 bridge_enqueue(sc, dst_if, mc, 0); 1266 } 1267 if (used == 0) 1268 m_freem(m); 1269 splx(s); 1270 return (0); 1271 } 1272 1273 sendunicast: 1274 /* 1275 * XXX Spanning tree consideration here? 1276 */ 1277 1278 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1279 m_freem(m); 1280 splx(s); 1281 return (0); 1282 } 1283 1284 bridge_enqueue(sc, dst_if, m, 0); 1285 1286 splx(s); 1287 return (0); 1288 } 1289 1290 /* 1291 * bridge_start: 1292 * 1293 * Start output on a bridge. 1294 * 1295 * NOTE: This routine should never be called in this implementation. 1296 */ 1297 void 1298 bridge_start(struct ifnet *ifp) 1299 { 1300 1301 printf("%s: bridge_start() called\n", ifp->if_xname); 1302 } 1303 1304 /* 1305 * bridge_forward: 1306 * 1307 * The forwarding function of the bridge. 1308 */ 1309 void 1310 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1311 { 1312 struct bridge_iflist *bif; 1313 struct ifnet *src_if, *dst_if; 1314 struct ether_header *eh; 1315 1316 src_if = m->m_pkthdr.rcvif; 1317 1318 sc->sc_if.if_ipackets++; 1319 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1320 1321 /* 1322 * Look up the bridge_iflist. 1323 */ 1324 bif = bridge_lookup_member_if(sc, src_if); 1325 if (bif == NULL) { 1326 /* Interface is not a bridge member (anymore?) */ 1327 m_freem(m); 1328 return; 1329 } 1330 1331 if (bif->bif_flags & IFBIF_STP) { 1332 switch (bif->bif_state) { 1333 case BSTP_IFSTATE_BLOCKING: 1334 case BSTP_IFSTATE_LISTENING: 1335 case BSTP_IFSTATE_DISABLED: 1336 m_freem(m); 1337 return; 1338 } 1339 } 1340 1341 eh = mtod(m, struct ether_header *); 1342 1343 /* 1344 * If the interface is learning, and the source 1345 * address is valid and not multicast, record 1346 * the address. 1347 */ 1348 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1349 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1350 (eh->ether_shost[0] == 0 && 1351 eh->ether_shost[1] == 0 && 1352 eh->ether_shost[2] == 0 && 1353 eh->ether_shost[3] == 0 && 1354 eh->ether_shost[4] == 0 && 1355 eh->ether_shost[5] == 0) == 0) { 1356 (void) bridge_rtupdate(sc, eh->ether_shost, 1357 src_if, 0, IFBAF_DYNAMIC); 1358 } 1359 1360 if ((bif->bif_flags & IFBIF_STP) != 0 && 1361 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1362 m_freem(m); 1363 return; 1364 } 1365 1366 /* 1367 * At this point, the port either doesn't participate 1368 * in spanning tree or it is in the forwarding state. 1369 */ 1370 1371 /* 1372 * If the packet is unicast, destined for someone on 1373 * "this" side of the bridge, drop it. 1374 */ 1375 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1376 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1377 if (src_if == dst_if) { 1378 m_freem(m); 1379 return; 1380 } 1381 } else { 1382 /* ...forward it to all interfaces. */ 1383 sc->sc_if.if_imcasts++; 1384 dst_if = NULL; 1385 } 1386 1387 #ifdef PFIL_HOOKS 1388 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1389 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1390 if (m != NULL) 1391 m_freem(m); 1392 return; 1393 } 1394 if (m == NULL) 1395 return; 1396 #endif /* PFIL_HOOKS */ 1397 1398 if (dst_if == NULL) { 1399 bridge_broadcast(sc, src_if, m); 1400 return; 1401 } 1402 1403 /* 1404 * At this point, we're dealing with a unicast frame 1405 * going to a different interface. 1406 */ 1407 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1408 m_freem(m); 1409 return; 1410 } 1411 bif = bridge_lookup_member_if(sc, dst_if); 1412 if (bif == NULL) { 1413 /* Not a member of the bridge (anymore?) */ 1414 m_freem(m); 1415 return; 1416 } 1417 1418 if (bif->bif_flags & IFBIF_STP) { 1419 switch (bif->bif_state) { 1420 case BSTP_IFSTATE_DISABLED: 1421 case BSTP_IFSTATE_BLOCKING: 1422 m_freem(m); 1423 return; 1424 } 1425 } 1426 1427 bridge_enqueue(sc, dst_if, m, 1); 1428 } 1429 1430 /* 1431 * bridge_input: 1432 * 1433 * Receive input from a member interface. Queue the packet for 1434 * bridging if it is not for us. 1435 */ 1436 struct mbuf * 1437 bridge_input(struct ifnet *ifp, struct mbuf *m) 1438 { 1439 struct bridge_softc *sc = ifp->if_bridge; 1440 struct bridge_iflist *bif; 1441 struct ether_header *eh; 1442 struct mbuf *mc; 1443 1444 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1445 return (m); 1446 1447 bif = bridge_lookup_member_if(sc, ifp); 1448 if (bif == NULL) 1449 return (m); 1450 1451 eh = mtod(m, struct ether_header *); 1452 1453 if (m->m_flags & (M_BCAST|M_MCAST)) { 1454 /* Tap off 802.1D packets; they do not get forwarded. */ 1455 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1456 ETHER_ADDR_LEN) == 0) { 1457 m = bstp_input(ifp, m); 1458 if (m == NULL) 1459 return (NULL); 1460 } 1461 1462 if (bif->bif_flags & IFBIF_STP) { 1463 switch (bif->bif_state) { 1464 case BSTP_IFSTATE_BLOCKING: 1465 case BSTP_IFSTATE_LISTENING: 1466 case BSTP_IFSTATE_DISABLED: 1467 return (m); 1468 } 1469 } 1470 1471 /* 1472 * Make a deep copy of the packet and enqueue the copy 1473 * for bridge processing; return the original packet for 1474 * local processing. 1475 */ 1476 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1477 if (mc == NULL) 1478 return (m); 1479 1480 /* Perform the bridge forwarding function with the copy. */ 1481 bridge_forward(sc, mc); 1482 1483 /* Return the original packet for local processing. */ 1484 return (m); 1485 } 1486 1487 if (bif->bif_flags & IFBIF_STP) { 1488 switch (bif->bif_state) { 1489 case BSTP_IFSTATE_BLOCKING: 1490 case BSTP_IFSTATE_LISTENING: 1491 case BSTP_IFSTATE_DISABLED: 1492 return (m); 1493 } 1494 } 1495 1496 /* 1497 * Unicast. Make sure it's not for us. 1498 */ 1499 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1500 /* It is destined for us. */ 1501 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1502 ETHER_ADDR_LEN) == 0) { 1503 if (bif->bif_flags & IFBIF_LEARNING) 1504 (void) bridge_rtupdate(sc, 1505 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1506 m->m_pkthdr.rcvif = bif->bif_ifp; 1507 return (m); 1508 } 1509 1510 /* We just received a packet that we sent out. */ 1511 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1512 ETHER_ADDR_LEN) == 0) { 1513 m_freem(m); 1514 return (NULL); 1515 } 1516 } 1517 1518 /* Perform the bridge forwarding function. */ 1519 bridge_forward(sc, m); 1520 1521 return (NULL); 1522 } 1523 1524 /* 1525 * bridge_broadcast: 1526 * 1527 * Send a frame to all interfaces that are members of 1528 * the bridge, except for the one on which the packet 1529 * arrived. 1530 */ 1531 void 1532 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1533 struct mbuf *m) 1534 { 1535 struct bridge_iflist *bif; 1536 struct mbuf *mc; 1537 struct ifnet *dst_if; 1538 int used = 0; 1539 1540 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1541 dst_if = bif->bif_ifp; 1542 if (dst_if == src_if) 1543 continue; 1544 1545 if (bif->bif_flags & IFBIF_STP) { 1546 switch (bif->bif_state) { 1547 case BSTP_IFSTATE_BLOCKING: 1548 case BSTP_IFSTATE_DISABLED: 1549 continue; 1550 } 1551 } 1552 1553 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1554 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1555 continue; 1556 1557 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1558 continue; 1559 1560 if (LIST_NEXT(bif, bif_next) == NULL) { 1561 mc = m; 1562 used = 1; 1563 } else { 1564 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1565 if (mc == NULL) { 1566 sc->sc_if.if_oerrors++; 1567 continue; 1568 } 1569 } 1570 1571 bridge_enqueue(sc, dst_if, mc, 1); 1572 } 1573 if (used == 0) 1574 m_freem(m); 1575 } 1576 1577 /* 1578 * bridge_rtupdate: 1579 * 1580 * Add a bridge routing entry. 1581 */ 1582 int 1583 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1584 struct ifnet *dst_if, int setflags, uint8_t flags) 1585 { 1586 struct bridge_rtnode *brt; 1587 int error; 1588 1589 /* 1590 * A route for this destination might already exist. If so, 1591 * update it, otherwise create a new one. 1592 */ 1593 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1594 if (sc->sc_brtcnt >= sc->sc_brtmax) 1595 return (ENOSPC); 1596 1597 /* 1598 * Allocate a new bridge forwarding node, and 1599 * initialize the expiration time and Ethernet 1600 * address. 1601 */ 1602 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1603 if (brt == NULL) 1604 return (ENOMEM); 1605 1606 memset(brt, 0, sizeof(*brt)); 1607 brt->brt_expire = mono_time.tv_sec + sc->sc_brttimeout; 1608 brt->brt_flags = IFBAF_DYNAMIC; 1609 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1610 1611 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1612 pool_put(&bridge_rtnode_pool, brt); 1613 return (error); 1614 } 1615 } 1616 1617 brt->brt_ifp = dst_if; 1618 if (setflags) { 1619 brt->brt_flags = flags; 1620 brt->brt_expire = (flags & IFBAF_STATIC) ? 0 : 1621 mono_time.tv_sec + sc->sc_brttimeout; 1622 } 1623 1624 return (0); 1625 } 1626 1627 /* 1628 * bridge_rtlookup: 1629 * 1630 * Lookup the destination interface for an address. 1631 */ 1632 struct ifnet * 1633 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1634 { 1635 struct bridge_rtnode *brt; 1636 1637 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1638 return (NULL); 1639 1640 return (brt->brt_ifp); 1641 } 1642 1643 /* 1644 * bridge_rttrim: 1645 * 1646 * Trim the routine table so that we have a number 1647 * of routing entries less than or equal to the 1648 * maximum number. 1649 */ 1650 void 1651 bridge_rttrim(struct bridge_softc *sc) 1652 { 1653 struct bridge_rtnode *brt, *nbrt; 1654 1655 /* Make sure we actually need to do this. */ 1656 if (sc->sc_brtcnt <= sc->sc_brtmax) 1657 return; 1658 1659 /* Force an aging cycle; this might trim enough addresses. */ 1660 bridge_rtage(sc); 1661 if (sc->sc_brtcnt <= sc->sc_brtmax) 1662 return; 1663 1664 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1665 nbrt = LIST_NEXT(brt, brt_list); 1666 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1667 bridge_rtnode_destroy(sc, brt); 1668 if (sc->sc_brtcnt <= sc->sc_brtmax) 1669 return; 1670 } 1671 } 1672 } 1673 1674 /* 1675 * bridge_timer: 1676 * 1677 * Aging timer for the bridge. 1678 */ 1679 void 1680 bridge_timer(void *arg) 1681 { 1682 struct bridge_softc *sc = arg; 1683 int s; 1684 1685 s = splnet(); 1686 bridge_rtage(sc); 1687 splx(s); 1688 1689 if (sc->sc_if.if_flags & IFF_RUNNING) 1690 callout_reset(&sc->sc_brcallout, 1691 bridge_rtable_prune_period * hz, bridge_timer, sc); 1692 } 1693 1694 /* 1695 * bridge_rtage: 1696 * 1697 * Perform an aging cycle. 1698 */ 1699 void 1700 bridge_rtage(struct bridge_softc *sc) 1701 { 1702 struct bridge_rtnode *brt, *nbrt; 1703 1704 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1705 nbrt = LIST_NEXT(brt, brt_list); 1706 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1707 if (mono_time.tv_sec >= brt->brt_expire) 1708 bridge_rtnode_destroy(sc, brt); 1709 } 1710 } 1711 } 1712 1713 /* 1714 * bridge_rtflush: 1715 * 1716 * Remove all dynamic addresses from the bridge. 1717 */ 1718 void 1719 bridge_rtflush(struct bridge_softc *sc, int full) 1720 { 1721 struct bridge_rtnode *brt, *nbrt; 1722 1723 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1724 nbrt = LIST_NEXT(brt, brt_list); 1725 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1726 bridge_rtnode_destroy(sc, brt); 1727 } 1728 } 1729 1730 /* 1731 * bridge_rtdaddr: 1732 * 1733 * Remove an address from the table. 1734 */ 1735 int 1736 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1737 { 1738 struct bridge_rtnode *brt; 1739 1740 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1741 return (ENOENT); 1742 1743 bridge_rtnode_destroy(sc, brt); 1744 return (0); 1745 } 1746 1747 /* 1748 * bridge_rtdelete: 1749 * 1750 * Delete routes to a speicifc member interface. 1751 */ 1752 void 1753 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1754 { 1755 struct bridge_rtnode *brt, *nbrt; 1756 1757 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1758 nbrt = LIST_NEXT(brt, brt_list); 1759 if (brt->brt_ifp == ifp) 1760 bridge_rtnode_destroy(sc, brt); 1761 } 1762 } 1763 1764 /* 1765 * bridge_rtable_init: 1766 * 1767 * Initialize the route table for this bridge. 1768 */ 1769 int 1770 bridge_rtable_init(struct bridge_softc *sc) 1771 { 1772 int i; 1773 1774 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1775 M_DEVBUF, M_NOWAIT); 1776 if (sc->sc_rthash == NULL) 1777 return (ENOMEM); 1778 1779 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1780 LIST_INIT(&sc->sc_rthash[i]); 1781 1782 sc->sc_rthash_key = arc4random(); 1783 1784 LIST_INIT(&sc->sc_rtlist); 1785 1786 return (0); 1787 } 1788 1789 /* 1790 * bridge_rtable_fini: 1791 * 1792 * Deconstruct the route table for this bridge. 1793 */ 1794 void 1795 bridge_rtable_fini(struct bridge_softc *sc) 1796 { 1797 1798 free(sc->sc_rthash, M_DEVBUF); 1799 } 1800 1801 /* 1802 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1803 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1804 */ 1805 #define mix(a, b, c) \ 1806 do { \ 1807 a -= b; a -= c; a ^= (c >> 13); \ 1808 b -= c; b -= a; b ^= (a << 8); \ 1809 c -= a; c -= b; c ^= (b >> 13); \ 1810 a -= b; a -= c; a ^= (c >> 12); \ 1811 b -= c; b -= a; b ^= (a << 16); \ 1812 c -= a; c -= b; c ^= (b >> 5); \ 1813 a -= b; a -= c; a ^= (c >> 3); \ 1814 b -= c; b -= a; b ^= (a << 10); \ 1815 c -= a; c -= b; c ^= (b >> 15); \ 1816 } while (/*CONSTCOND*/0) 1817 1818 static __inline uint32_t 1819 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1820 { 1821 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1822 1823 b += addr[5] << 8; 1824 b += addr[4]; 1825 a += addr[3] << 24; 1826 a += addr[2] << 16; 1827 a += addr[1] << 8; 1828 a += addr[0]; 1829 1830 mix(a, b, c); 1831 1832 return (c & BRIDGE_RTHASH_MASK); 1833 } 1834 1835 #undef mix 1836 1837 /* 1838 * bridge_rtnode_lookup: 1839 * 1840 * Look up a bridge route node for the specified destination. 1841 */ 1842 struct bridge_rtnode * 1843 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1844 { 1845 struct bridge_rtnode *brt; 1846 uint32_t hash; 1847 int dir; 1848 1849 hash = bridge_rthash(sc, addr); 1850 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1851 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1852 if (dir == 0) 1853 return (brt); 1854 if (dir > 0) 1855 return (NULL); 1856 } 1857 1858 return (NULL); 1859 } 1860 1861 /* 1862 * bridge_rtnode_insert: 1863 * 1864 * Insert the specified bridge node into the route table. We 1865 * assume the entry is not already in the table. 1866 */ 1867 int 1868 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1869 { 1870 struct bridge_rtnode *lbrt; 1871 uint32_t hash; 1872 int dir; 1873 1874 hash = bridge_rthash(sc, brt->brt_addr); 1875 1876 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1877 if (lbrt == NULL) { 1878 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1879 goto out; 1880 } 1881 1882 do { 1883 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1884 if (dir == 0) 1885 return (EEXIST); 1886 if (dir > 0) { 1887 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1888 goto out; 1889 } 1890 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1891 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1892 goto out; 1893 } 1894 lbrt = LIST_NEXT(lbrt, brt_hash); 1895 } while (lbrt != NULL); 1896 1897 #ifdef DIAGNOSTIC 1898 panic("bridge_rtnode_insert: impossible"); 1899 #endif 1900 1901 out: 1902 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1903 sc->sc_brtcnt++; 1904 1905 return (0); 1906 } 1907 1908 /* 1909 * bridge_rtnode_destroy: 1910 * 1911 * Destroy a bridge rtnode. 1912 */ 1913 void 1914 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1915 { 1916 1917 LIST_REMOVE(brt, brt_hash); 1918 1919 LIST_REMOVE(brt, brt_list); 1920 sc->sc_brtcnt--; 1921 pool_put(&bridge_rtnode_pool, brt); 1922 } 1923 1924 #ifdef BRIDGE_IPF 1925 extern struct pfil_head inet_pfil_hook; /* XXX */ 1926 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1927 1928 /* 1929 * Send bridge packets through IPF if they are one of the types IPF can deal 1930 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1931 * question.) 1932 */ 1933 static int bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1934 { 1935 int snap, error; 1936 struct ether_header *eh1, eh2; 1937 struct llc llc; 1938 u_int16_t ether_type; 1939 1940 snap = 0; 1941 error = -1; /* Default error if not error == 0 */ 1942 eh1 = mtod(*mp, struct ether_header *); 1943 ether_type = ntohs(eh1->ether_type); 1944 1945 /* 1946 * Check for SNAP/LLC. 1947 */ 1948 if (ether_type < ETHERMTU) { 1949 struct llc *llc = (struct llc *)(eh1 + 1); 1950 1951 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1952 llc->llc_dsap == LLC_SNAP_LSAP && 1953 llc->llc_ssap == LLC_SNAP_LSAP && 1954 llc->llc_control == LLC_UI) { 1955 ether_type = htons(llc->llc_un.type_snap.ether_type); 1956 snap = 1; 1957 } 1958 } 1959 1960 /* 1961 * If we're trying to filter bridge traffic, don't look at anything 1962 * other than IP and ARP traffic. If the filter doesn't understand 1963 * IPv6, don't allow IPv6 through the bridge either. This is lame 1964 * since if we really wanted, say, an AppleTalk filter, we are hosed, 1965 * but of course we don't have an AppleTalk filter to begin with. 1966 * (Note that since IPF doesn't understand ARP it will pass *ALL* 1967 * ARP traffic.) 1968 */ 1969 switch (ether_type) { 1970 case ETHERTYPE_ARP: 1971 case ETHERTYPE_REVARP: 1972 return 0; /* Automatically pass */ 1973 case ETHERTYPE_IP: 1974 # ifdef INET6 1975 case ETHERTYPE_IPV6: 1976 # endif /* INET6 */ 1977 break; 1978 default: 1979 goto bad; 1980 } 1981 1982 /* Strip off the Ethernet header and keep a copy. */ 1983 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 1984 m_adj(*mp, ETHER_HDR_LEN); 1985 1986 /* Strip off snap header, if present */ 1987 if (snap) { 1988 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc); 1989 m_adj(*mp, sizeof(struct llc)); 1990 } 1991 1992 /* 1993 * Check basic packet sanity and run IPF through pfil. 1994 */ 1995 switch (ether_type) 1996 { 1997 case ETHERTYPE_IP : 1998 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 1999 if (error == 0) 2000 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2001 break; 2002 # ifdef INET6 2003 case ETHERTYPE_IPV6 : 2004 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2005 if (error == 0) 2006 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2007 break; 2008 # endif 2009 default : 2010 error = 0; 2011 break; 2012 } 2013 2014 if (*mp == NULL) 2015 return error; 2016 if (error != 0) 2017 goto bad; 2018 2019 error = -1; 2020 2021 /* 2022 * Finally, put everything back the way it was and return 2023 */ 2024 if (snap) { 2025 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2026 if (*mp == NULL) 2027 return error; 2028 bcopy(&llc, mtod(*mp, caddr_t), sizeof(struct llc)); 2029 } 2030 2031 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2032 if (*mp == NULL) 2033 return error; 2034 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2035 2036 return 0; 2037 2038 bad: 2039 m_freem(*mp); 2040 *mp = NULL; 2041 return error; 2042 } 2043 2044 /* 2045 * Perform basic checks on header size since 2046 * IPF assumes ip_input has already processed 2047 * it for it. Cut-and-pasted from ip_input.c. 2048 * Given how simple the IPv6 version is, 2049 * does the IPv4 version really need to be 2050 * this complicated? 2051 * 2052 * XXX Should we update ipstat here, or not? 2053 * XXX Right now we update ipstat but not 2054 * XXX csum_counter. 2055 */ 2056 static int 2057 bridge_ip_checkbasic(struct mbuf **mp) 2058 { 2059 struct mbuf *m = *mp; 2060 struct ip *ip; 2061 int len, hlen; 2062 2063 if (*mp == NULL) 2064 return -1; 2065 2066 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2067 if ((m = m_copyup(m, sizeof(struct ip), 2068 (max_linkhdr + 3) & ~3)) == NULL) { 2069 /* XXXJRT new stat, please */ 2070 ipstat.ips_toosmall++; 2071 goto bad; 2072 } 2073 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2074 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2075 ipstat.ips_toosmall++; 2076 goto bad; 2077 } 2078 } 2079 ip = mtod(m, struct ip *); 2080 if (ip == NULL) goto bad; 2081 2082 if (ip->ip_v != IPVERSION) { 2083 ipstat.ips_badvers++; 2084 goto bad; 2085 } 2086 hlen = ip->ip_hl << 2; 2087 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2088 ipstat.ips_badhlen++; 2089 goto bad; 2090 } 2091 if (hlen > m->m_len) { 2092 if ((m = m_pullup(m, hlen)) == 0) { 2093 ipstat.ips_badhlen++; 2094 goto bad; 2095 } 2096 ip = mtod(m, struct ip *); 2097 if (ip == NULL) goto bad; 2098 } 2099 2100 switch (m->m_pkthdr.csum_flags & 2101 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2102 M_CSUM_IPv4_BAD)) { 2103 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2104 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2105 goto bad; 2106 2107 case M_CSUM_IPv4: 2108 /* Checksum was okay. */ 2109 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2110 break; 2111 2112 default: 2113 /* Must compute it ourselves. */ 2114 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2115 if (in_cksum(m, hlen) != 0) 2116 goto bad; 2117 break; 2118 } 2119 2120 /* Retrieve the packet length. */ 2121 len = ntohs(ip->ip_len); 2122 2123 /* 2124 * Check for additional length bogosity 2125 */ 2126 if (len < hlen) { 2127 ipstat.ips_badlen++; 2128 goto bad; 2129 } 2130 2131 /* 2132 * Check that the amount of data in the buffers 2133 * is as at least much as the IP header would have us expect. 2134 * Drop packet if shorter than we expect. 2135 */ 2136 if (m->m_pkthdr.len < len) { 2137 ipstat.ips_tooshort++; 2138 goto bad; 2139 } 2140 2141 /* Checks out, proceed */ 2142 *mp = m; 2143 return 0; 2144 2145 bad: 2146 *mp = m; 2147 return -1; 2148 } 2149 2150 # ifdef INET6 2151 /* 2152 * Same as above, but for IPv6. 2153 * Cut-and-pasted from ip6_input.c. 2154 * XXX Should we update ip6stat, or not? 2155 */ 2156 static int 2157 bridge_ip6_checkbasic(struct mbuf **mp) 2158 { 2159 struct mbuf *m = *mp; 2160 struct ip6_hdr *ip6; 2161 2162 /* 2163 * If the IPv6 header is not aligned, slurp it up into a new 2164 * mbuf with space for link headers, in the event we forward 2165 * it. Otherwise, if it is aligned, make sure the entire base 2166 * IPv6 header is in the first mbuf of the chain. 2167 */ 2168 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2169 struct ifnet *inifp = m->m_pkthdr.rcvif; 2170 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2171 (max_linkhdr + 3) & ~3)) == NULL) { 2172 /* XXXJRT new stat, please */ 2173 ip6stat.ip6s_toosmall++; 2174 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2175 goto bad; 2176 } 2177 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2178 struct ifnet *inifp = m->m_pkthdr.rcvif; 2179 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2180 ip6stat.ip6s_toosmall++; 2181 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2182 goto bad; 2183 } 2184 } 2185 2186 ip6 = mtod(m, struct ip6_hdr *); 2187 2188 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2189 ip6stat.ip6s_badvers++; 2190 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2191 goto bad; 2192 } 2193 2194 /* Checks out, proceed */ 2195 *mp = m; 2196 return 0; 2197 2198 bad: 2199 *mp = m; 2200 return -1; 2201 } 2202 # endif /* INET6 */ 2203 #endif /* BRIDGE_IPF */ 2204
Indexes created Thu Oct 02 14:10:14 GMT 2025