if_bridge.c revision 1.36.8.2
1 /* $NetBSD: if_bridge.c,v 1.36.8.2 2006/03/10 15:05:22 elad 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 1.36.8.2 2006/03/10 15:05:22 elad Exp $"); 84 85 #include "opt_bridge_ipf.h" 86 #include "opt_inet.h" 87 #include "opt_pfil_hooks.h" 88 #include "bpfilter.h" 89 #include "gif.h" 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/sockio.h> 97 #include <sys/systm.h> 98 #include <sys/proc.h> 99 #include <sys/pool.h> 100 101 #if NBPFILTER > 0 102 #include <net/bpf.h> 103 #endif 104 #include <net/if.h> 105 #include <net/if_dl.h> 106 #include <net/if_types.h> 107 #include <net/if_llc.h> 108 109 #include <net/if_ether.h> 110 #include <net/if_bridgevar.h> 111 112 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 113 /* Used for bridge_ip[6]_checkbasic */ 114 #include <netinet/in.h> 115 #include <netinet/in_systm.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 119 #include <netinet/ip6.h> 120 #include <netinet6/in6_var.h> 121 #include <netinet6/ip6_var.h> 122 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 123 124 /* 125 * Size of the route hash table. Must be a power of two. 126 */ 127 #ifndef BRIDGE_RTHASH_SIZE 128 #define BRIDGE_RTHASH_SIZE 1024 129 #endif 130 131 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 132 133 /* 134 * Maximum number of addresses to cache. 135 */ 136 #ifndef BRIDGE_RTABLE_MAX 137 #define BRIDGE_RTABLE_MAX 100 138 #endif 139 140 /* 141 * Spanning tree defaults. 142 */ 143 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 144 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 145 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 146 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 147 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 148 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 149 #define BSTP_DEFAULT_PATH_COST 55 150 151 /* 152 * Timeout (in seconds) for entries learned dynamically. 153 */ 154 #ifndef BRIDGE_RTABLE_TIMEOUT 155 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 156 #endif 157 158 /* 159 * Number of seconds between walks of the route list. 160 */ 161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 162 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 163 #endif 164 165 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 166 167 static struct pool bridge_rtnode_pool; 168 169 void bridgeattach(int); 170 171 static int bridge_clone_create(struct if_clone *, int); 172 static int bridge_clone_destroy(struct ifnet *); 173 174 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 175 static int bridge_init(struct ifnet *); 176 static void bridge_stop(struct ifnet *, int); 177 static void bridge_start(struct ifnet *); 178 179 static void bridge_forward(struct bridge_softc *, struct mbuf *m); 180 181 static void bridge_timer(void *); 182 183 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 184 struct mbuf *); 185 186 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 187 struct ifnet *, int, uint8_t); 188 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 189 static void bridge_rttrim(struct bridge_softc *); 190 static void bridge_rtage(struct bridge_softc *); 191 static void bridge_rtflush(struct bridge_softc *, int); 192 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 193 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 194 195 static int bridge_rtable_init(struct bridge_softc *); 196 static void bridge_rtable_fini(struct bridge_softc *); 197 198 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 199 const uint8_t *); 200 static int bridge_rtnode_insert(struct bridge_softc *, 201 struct bridge_rtnode *); 202 static void bridge_rtnode_destroy(struct bridge_softc *, 203 struct bridge_rtnode *); 204 205 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 206 const char *name); 207 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 208 struct ifnet *ifp); 209 static void bridge_delete_member(struct bridge_softc *, 210 struct bridge_iflist *); 211 212 static int bridge_ioctl_add(struct bridge_softc *, void *); 213 static int bridge_ioctl_del(struct bridge_softc *, void *); 214 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 215 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 216 static int bridge_ioctl_scache(struct bridge_softc *, void *); 217 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 218 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 219 static int bridge_ioctl_rts(struct bridge_softc *, void *); 220 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 221 static int bridge_ioctl_sto(struct bridge_softc *, void *); 222 static int bridge_ioctl_gto(struct bridge_softc *, void *); 223 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 224 static int bridge_ioctl_flush(struct bridge_softc *, void *); 225 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 226 static int bridge_ioctl_spri(struct bridge_softc *, void *); 227 static int bridge_ioctl_ght(struct bridge_softc *, void *); 228 static int bridge_ioctl_sht(struct bridge_softc *, void *); 229 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 230 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 231 static int bridge_ioctl_gma(struct bridge_softc *, void *); 232 static int bridge_ioctl_sma(struct bridge_softc *, void *); 233 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 234 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 235 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 236 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 237 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 238 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 239 static int bridge_ip_checkbasic(struct mbuf **mp); 240 # ifdef INET6 241 static int bridge_ip6_checkbasic(struct mbuf **mp); 242 # endif /* INET6 */ 243 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 244 245 struct bridge_control { 246 int (*bc_func)(struct bridge_softc *, void *); 247 int bc_argsize; 248 int bc_flags; 249 }; 250 251 #define BC_F_COPYIN 0x01 /* copy arguments in */ 252 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 253 #define BC_F_SUSER 0x04 /* do super-user check */ 254 255 static const struct bridge_control bridge_control_table[] = { 256 { bridge_ioctl_add, sizeof(struct ifbreq), 257 BC_F_COPYIN|BC_F_SUSER }, 258 { bridge_ioctl_del, sizeof(struct ifbreq), 259 BC_F_COPYIN|BC_F_SUSER }, 260 261 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 262 BC_F_COPYIN|BC_F_COPYOUT }, 263 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 264 BC_F_COPYIN|BC_F_SUSER }, 265 266 { bridge_ioctl_scache, sizeof(struct ifbrparam), 267 BC_F_COPYIN|BC_F_SUSER }, 268 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 269 BC_F_COPYOUT }, 270 271 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 272 BC_F_COPYIN|BC_F_COPYOUT }, 273 { bridge_ioctl_rts, sizeof(struct ifbaconf), 274 BC_F_COPYIN|BC_F_COPYOUT }, 275 276 { bridge_ioctl_saddr, sizeof(struct ifbareq), 277 BC_F_COPYIN|BC_F_SUSER }, 278 279 { bridge_ioctl_sto, sizeof(struct ifbrparam), 280 BC_F_COPYIN|BC_F_SUSER }, 281 { bridge_ioctl_gto, sizeof(struct ifbrparam), 282 BC_F_COPYOUT }, 283 284 { bridge_ioctl_daddr, sizeof(struct ifbareq), 285 BC_F_COPYIN|BC_F_SUSER }, 286 287 { bridge_ioctl_flush, sizeof(struct ifbreq), 288 BC_F_COPYIN|BC_F_SUSER }, 289 290 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 291 BC_F_COPYOUT }, 292 { bridge_ioctl_spri, sizeof(struct ifbrparam), 293 BC_F_COPYIN|BC_F_SUSER }, 294 295 { bridge_ioctl_ght, sizeof(struct ifbrparam), 296 BC_F_COPYOUT }, 297 { bridge_ioctl_sht, sizeof(struct ifbrparam), 298 BC_F_COPYIN|BC_F_SUSER }, 299 300 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 301 BC_F_COPYOUT }, 302 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 303 BC_F_COPYIN|BC_F_SUSER }, 304 305 { bridge_ioctl_gma, sizeof(struct ifbrparam), 306 BC_F_COPYOUT }, 307 { bridge_ioctl_sma, sizeof(struct ifbrparam), 308 BC_F_COPYIN|BC_F_SUSER }, 309 310 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 311 BC_F_COPYIN|BC_F_SUSER }, 312 313 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 314 BC_F_COPYIN|BC_F_SUSER }, 315 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 316 { bridge_ioctl_gfilt, sizeof(struct ifbrparam), 317 BC_F_COPYOUT }, 318 { bridge_ioctl_sfilt, sizeof(struct ifbrparam), 319 BC_F_COPYIN|BC_F_SUSER }, 320 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 321 }; 322 static const int bridge_control_table_size = 323 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 324 325 static LIST_HEAD(, bridge_softc) bridge_list; 326 327 static struct if_clone bridge_cloner = 328 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 329 330 /* 331 * bridgeattach: 332 * 333 * Pseudo-device attach routine. 334 */ 335 void 336 bridgeattach(int n) 337 { 338 339 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 340 0, 0, 0, "brtpl", NULL); 341 342 LIST_INIT(&bridge_list); 343 if_clone_attach(&bridge_cloner); 344 } 345 346 /* 347 * bridge_clone_create: 348 * 349 * Create a new bridge instance. 350 */ 351 static int 352 bridge_clone_create(struct if_clone *ifc, int unit) 353 { 354 struct bridge_softc *sc; 355 struct ifnet *ifp; 356 int s; 357 358 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK); 359 memset(sc, 0, sizeof(*sc)); 360 ifp = &sc->sc_if; 361 362 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 363 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 364 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 365 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 366 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 367 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 368 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 369 sc->sc_filter_flags = 0; 370 371 /* Initialize our routing table. */ 372 bridge_rtable_init(sc); 373 374 callout_init(&sc->sc_brcallout); 375 callout_init(&sc->sc_bstpcallout); 376 377 LIST_INIT(&sc->sc_iflist); 378 379 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", ifc->ifc_name, 380 unit); 381 ifp->if_softc = sc; 382 ifp->if_mtu = ETHERMTU; 383 ifp->if_ioctl = bridge_ioctl; 384 ifp->if_output = bridge_output; 385 ifp->if_start = bridge_start; 386 ifp->if_stop = bridge_stop; 387 ifp->if_init = bridge_init; 388 ifp->if_type = IFT_BRIDGE; 389 ifp->if_addrlen = 0; 390 ifp->if_dlt = DLT_EN10MB; 391 ifp->if_hdrlen = ETHER_HDR_LEN; 392 393 if_attach(ifp); 394 395 if_alloc_sadl(ifp); 396 397 s = splnet(); 398 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 399 splx(s); 400 401 return (0); 402 } 403 404 /* 405 * bridge_clone_destroy: 406 * 407 * Destroy a bridge instance. 408 */ 409 static int 410 bridge_clone_destroy(struct ifnet *ifp) 411 { 412 struct bridge_softc *sc = ifp->if_softc; 413 struct bridge_iflist *bif; 414 int s; 415 416 s = splnet(); 417 418 bridge_stop(ifp, 1); 419 420 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 421 bridge_delete_member(sc, bif); 422 423 LIST_REMOVE(sc, sc_list); 424 425 splx(s); 426 427 if_detach(ifp); 428 429 /* Tear down the routing table. */ 430 bridge_rtable_fini(sc); 431 432 free(sc, M_DEVBUF); 433 434 return (0); 435 } 436 437 /* 438 * bridge_ioctl: 439 * 440 * Handle a control request from the operator. 441 */ 442 static int 443 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 444 { 445 struct bridge_softc *sc = ifp->if_softc; 446 struct proc *p = curproc; /* XXX */ 447 union { 448 struct ifbreq ifbreq; 449 struct ifbifconf ifbifconf; 450 struct ifbareq ifbareq; 451 struct ifbaconf ifbaconf; 452 struct ifbrparam ifbrparam; 453 } args; 454 struct ifdrv *ifd = (struct ifdrv *) data; 455 const struct bridge_control *bc; 456 int s, error = 0; 457 458 s = splnet(); 459 460 switch (cmd) { 461 case SIOCGDRVSPEC: 462 case SIOCSDRVSPEC: 463 if (ifd->ifd_cmd >= bridge_control_table_size) { 464 error = EINVAL; 465 break; 466 } 467 bc = &bridge_control_table[ifd->ifd_cmd]; 468 469 if (cmd == SIOCGDRVSPEC && 470 (bc->bc_flags & BC_F_COPYOUT) == 0) { 471 error = EINVAL; 472 break; 473 } 474 else if (cmd == SIOCSDRVSPEC && 475 (bc->bc_flags & BC_F_COPYOUT) != 0) { 476 error = EINVAL; 477 break; 478 } 479 480 if (bc->bc_flags & BC_F_SUSER) { 481 error = kauth_authorize_generic(p->p_cred, 482 KAUTH_GENERIC_ISSUSER, 483 &p->p_acflag); 484 if (error) 485 break; 486 } 487 488 if (ifd->ifd_len != bc->bc_argsize || 489 ifd->ifd_len > sizeof(args)) { 490 error = EINVAL; 491 break; 492 } 493 494 memset(&args, 0, sizeof(args)); 495 if (bc->bc_flags & BC_F_COPYIN) { 496 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 497 if (error) 498 break; 499 } 500 501 error = (*bc->bc_func)(sc, &args); 502 if (error) 503 break; 504 505 if (bc->bc_flags & BC_F_COPYOUT) 506 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 507 508 break; 509 510 case SIOCSIFFLAGS: 511 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 512 /* 513 * If interface is marked down and it is running, 514 * then stop and disable it. 515 */ 516 (*ifp->if_stop)(ifp, 1); 517 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 518 /* 519 * If interface is marked up and it is stopped, then 520 * start it. 521 */ 522 error = (*ifp->if_init)(ifp); 523 } 524 break; 525 526 default: 527 error = ENOTTY; 528 break; 529 } 530 531 splx(s); 532 533 return (error); 534 } 535 536 /* 537 * bridge_lookup_member: 538 * 539 * Lookup a bridge member interface. Must be called at splnet(). 540 */ 541 static struct bridge_iflist * 542 bridge_lookup_member(struct bridge_softc *sc, const char *name) 543 { 544 struct bridge_iflist *bif; 545 struct ifnet *ifp; 546 547 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 548 ifp = bif->bif_ifp; 549 if (strcmp(ifp->if_xname, name) == 0) 550 return (bif); 551 } 552 553 return (NULL); 554 } 555 556 /* 557 * bridge_lookup_member_if: 558 * 559 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 560 */ 561 static struct bridge_iflist * 562 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 563 { 564 struct bridge_iflist *bif; 565 566 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 567 if (bif->bif_ifp == member_ifp) 568 return (bif); 569 } 570 571 return (NULL); 572 } 573 574 /* 575 * bridge_delete_member: 576 * 577 * Delete the specified member interface. 578 */ 579 static void 580 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 581 { 582 struct ifnet *ifs = bif->bif_ifp; 583 584 switch (ifs->if_type) { 585 case IFT_ETHER: 586 /* 587 * Take the interface out of promiscuous mode. 588 */ 589 (void) ifpromisc(ifs, 0); 590 break; 591 #if NGIF > 0 592 case IFT_GIF: 593 break; 594 #endif 595 default: 596 #ifdef DIAGNOSTIC 597 panic("bridge_delete_member: impossible"); 598 #endif 599 break; 600 } 601 602 ifs->if_bridge = NULL; 603 LIST_REMOVE(bif, bif_next); 604 605 bridge_rtdelete(sc, ifs); 606 607 free(bif, M_DEVBUF); 608 609 if (sc->sc_if.if_flags & IFF_RUNNING) 610 bstp_initialization(sc); 611 } 612 613 static int 614 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 615 { 616 struct ifbreq *req = arg; 617 struct bridge_iflist *bif = NULL; 618 struct ifnet *ifs; 619 int error = 0; 620 621 ifs = ifunit(req->ifbr_ifsname); 622 if (ifs == NULL) 623 return (ENOENT); 624 625 if (sc->sc_if.if_mtu != ifs->if_mtu) 626 return (EINVAL); 627 628 if (ifs->if_bridge == sc) 629 return (EEXIST); 630 631 if (ifs->if_bridge != NULL) 632 return (EBUSY); 633 634 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 635 if (bif == NULL) 636 return (ENOMEM); 637 638 switch (ifs->if_type) { 639 case IFT_ETHER: 640 /* 641 * Place the interface into promiscuous mode. 642 */ 643 error = ifpromisc(ifs, 1); 644 if (error) 645 goto out; 646 break; 647 #if NGIF > 0 648 case IFT_GIF: 649 break; 650 #endif 651 default: 652 error = EINVAL; 653 goto out; 654 } 655 656 bif->bif_ifp = ifs; 657 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 658 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 659 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 660 661 ifs->if_bridge = sc; 662 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 663 664 if (sc->sc_if.if_flags & IFF_RUNNING) 665 bstp_initialization(sc); 666 else 667 bstp_stop(sc); 668 669 out: 670 if (error) { 671 if (bif != NULL) 672 free(bif, M_DEVBUF); 673 } 674 return (error); 675 } 676 677 static int 678 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 679 { 680 struct ifbreq *req = arg; 681 struct bridge_iflist *bif; 682 683 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 684 if (bif == NULL) 685 return (ENOENT); 686 687 bridge_delete_member(sc, bif); 688 689 return (0); 690 } 691 692 static int 693 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 694 { 695 struct ifbreq *req = arg; 696 struct bridge_iflist *bif; 697 698 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 699 if (bif == NULL) 700 return (ENOENT); 701 702 req->ifbr_ifsflags = bif->bif_flags; 703 req->ifbr_state = bif->bif_state; 704 req->ifbr_priority = bif->bif_priority; 705 req->ifbr_path_cost = bif->bif_path_cost; 706 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 707 708 return (0); 709 } 710 711 static int 712 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 713 { 714 struct ifbreq *req = arg; 715 struct bridge_iflist *bif; 716 717 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 718 if (bif == NULL) 719 return (ENOENT); 720 721 if (req->ifbr_ifsflags & IFBIF_STP) { 722 switch (bif->bif_ifp->if_type) { 723 case IFT_ETHER: 724 /* These can do spanning tree. */ 725 break; 726 727 default: 728 /* Nothing else can. */ 729 return (EINVAL); 730 } 731 } 732 733 bif->bif_flags = req->ifbr_ifsflags; 734 735 if (sc->sc_if.if_flags & IFF_RUNNING) 736 bstp_initialization(sc); 737 738 return (0); 739 } 740 741 static int 742 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 743 { 744 struct ifbrparam *param = arg; 745 746 sc->sc_brtmax = param->ifbrp_csize; 747 bridge_rttrim(sc); 748 749 return (0); 750 } 751 752 static int 753 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 754 { 755 struct ifbrparam *param = arg; 756 757 param->ifbrp_csize = sc->sc_brtmax; 758 759 return (0); 760 } 761 762 static int 763 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 764 { 765 struct ifbifconf *bifc = arg; 766 struct bridge_iflist *bif; 767 struct ifbreq breq; 768 int count, len, error = 0; 769 770 count = 0; 771 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 772 count++; 773 774 if (bifc->ifbic_len == 0) { 775 bifc->ifbic_len = sizeof(breq) * count; 776 return (0); 777 } 778 779 count = 0; 780 len = bifc->ifbic_len; 781 memset(&breq, 0, sizeof breq); 782 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 783 if (len < sizeof(breq)) 784 break; 785 786 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 787 sizeof(breq.ifbr_ifsname)); 788 breq.ifbr_ifsflags = bif->bif_flags; 789 breq.ifbr_state = bif->bif_state; 790 breq.ifbr_priority = bif->bif_priority; 791 breq.ifbr_path_cost = bif->bif_path_cost; 792 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 793 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 794 if (error) 795 break; 796 count++; 797 len -= sizeof(breq); 798 } 799 800 bifc->ifbic_len = sizeof(breq) * count; 801 return (error); 802 } 803 804 static int 805 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 806 { 807 struct ifbaconf *bac = arg; 808 struct bridge_rtnode *brt; 809 struct ifbareq bareq; 810 int count = 0, error = 0, len; 811 812 if (bac->ifbac_len == 0) 813 return (0); 814 815 len = bac->ifbac_len; 816 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 817 if (len < sizeof(bareq)) 818 goto out; 819 memset(&bareq, 0, sizeof(bareq)); 820 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 821 sizeof(bareq.ifba_ifsname)); 822 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 823 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 824 bareq.ifba_expire = brt->brt_expire - mono_time.tv_sec; 825 else 826 bareq.ifba_expire = 0; 827 bareq.ifba_flags = brt->brt_flags; 828 829 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 830 if (error) 831 goto out; 832 count++; 833 len -= sizeof(bareq); 834 } 835 out: 836 bac->ifbac_len = sizeof(bareq) * count; 837 return (error); 838 } 839 840 static int 841 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 842 { 843 struct ifbareq *req = arg; 844 struct bridge_iflist *bif; 845 int error; 846 847 bif = bridge_lookup_member(sc, req->ifba_ifsname); 848 if (bif == NULL) 849 return (ENOENT); 850 851 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 852 req->ifba_flags); 853 854 return (error); 855 } 856 857 static int 858 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 859 { 860 struct ifbrparam *param = arg; 861 862 sc->sc_brttimeout = param->ifbrp_ctime; 863 864 return (0); 865 } 866 867 static int 868 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 869 { 870 struct ifbrparam *param = arg; 871 872 param->ifbrp_ctime = sc->sc_brttimeout; 873 874 return (0); 875 } 876 877 static int 878 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 879 { 880 struct ifbareq *req = arg; 881 882 return (bridge_rtdaddr(sc, req->ifba_dst)); 883 } 884 885 static int 886 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 887 { 888 struct ifbreq *req = arg; 889 890 bridge_rtflush(sc, req->ifbr_ifsflags); 891 892 return (0); 893 } 894 895 static int 896 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 897 { 898 struct ifbrparam *param = arg; 899 900 param->ifbrp_prio = sc->sc_bridge_priority; 901 902 return (0); 903 } 904 905 static int 906 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 907 { 908 struct ifbrparam *param = arg; 909 910 sc->sc_bridge_priority = param->ifbrp_prio; 911 912 if (sc->sc_if.if_flags & IFF_RUNNING) 913 bstp_initialization(sc); 914 915 return (0); 916 } 917 918 static int 919 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 920 { 921 struct ifbrparam *param = arg; 922 923 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 924 925 return (0); 926 } 927 928 static int 929 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 930 { 931 struct ifbrparam *param = arg; 932 933 if (param->ifbrp_hellotime == 0) 934 return (EINVAL); 935 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 936 937 if (sc->sc_if.if_flags & IFF_RUNNING) 938 bstp_initialization(sc); 939 940 return (0); 941 } 942 943 static int 944 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 945 { 946 struct ifbrparam *param = arg; 947 948 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 949 950 return (0); 951 } 952 953 static int 954 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 955 { 956 struct ifbrparam *param = arg; 957 958 if (param->ifbrp_fwddelay == 0) 959 return (EINVAL); 960 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 961 962 if (sc->sc_if.if_flags & IFF_RUNNING) 963 bstp_initialization(sc); 964 965 return (0); 966 } 967 968 static int 969 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 970 { 971 struct ifbrparam *param = arg; 972 973 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 974 975 return (0); 976 } 977 978 static int 979 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 980 { 981 struct ifbrparam *param = arg; 982 983 if (param->ifbrp_maxage == 0) 984 return (EINVAL); 985 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 986 987 if (sc->sc_if.if_flags & IFF_RUNNING) 988 bstp_initialization(sc); 989 990 return (0); 991 } 992 993 static int 994 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 995 { 996 struct ifbreq *req = arg; 997 struct bridge_iflist *bif; 998 999 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1000 if (bif == NULL) 1001 return (ENOENT); 1002 1003 bif->bif_priority = req->ifbr_priority; 1004 1005 if (sc->sc_if.if_flags & IFF_RUNNING) 1006 bstp_initialization(sc); 1007 1008 return (0); 1009 } 1010 1011 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1012 static int 1013 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1014 { 1015 struct ifbrparam *param = arg; 1016 1017 param->ifbrp_filter = sc->sc_filter_flags; 1018 1019 return (0); 1020 } 1021 1022 static int 1023 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1024 { 1025 struct ifbrparam *param = arg; 1026 uint32_t nflags, oflags; 1027 1028 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1029 return (EINVAL); 1030 1031 nflags = param->ifbrp_filter; 1032 oflags = sc->sc_filter_flags; 1033 1034 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1035 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1036 &sc->sc_if.if_pfil); 1037 } 1038 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1039 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1040 &sc->sc_if.if_pfil); 1041 } 1042 1043 sc->sc_filter_flags = nflags; 1044 1045 return (0); 1046 } 1047 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1048 1049 static int 1050 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1051 { 1052 struct ifbreq *req = arg; 1053 struct bridge_iflist *bif; 1054 1055 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1056 if (bif == NULL) 1057 return (ENOENT); 1058 1059 bif->bif_path_cost = req->ifbr_path_cost; 1060 1061 if (sc->sc_if.if_flags & IFF_RUNNING) 1062 bstp_initialization(sc); 1063 1064 return (0); 1065 } 1066 1067 /* 1068 * bridge_ifdetach: 1069 * 1070 * Detach an interface from a bridge. Called when a member 1071 * interface is detaching. 1072 */ 1073 void 1074 bridge_ifdetach(struct ifnet *ifp) 1075 { 1076 struct bridge_softc *sc = ifp->if_bridge; 1077 struct ifbreq breq; 1078 1079 memset(&breq, 0, sizeof(breq)); 1080 snprintf(breq.ifbr_ifsname, sizeof(breq.ifbr_ifsname), ifp->if_xname); 1081 1082 (void) bridge_ioctl_del(sc, &breq); 1083 } 1084 1085 /* 1086 * bridge_init: 1087 * 1088 * Initialize a bridge interface. 1089 */ 1090 static int 1091 bridge_init(struct ifnet *ifp) 1092 { 1093 struct bridge_softc *sc = ifp->if_softc; 1094 1095 if (ifp->if_flags & IFF_RUNNING) 1096 return (0); 1097 1098 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1099 bridge_timer, sc); 1100 1101 ifp->if_flags |= IFF_RUNNING; 1102 bstp_initialization(sc); 1103 return (0); 1104 } 1105 1106 /* 1107 * bridge_stop: 1108 * 1109 * Stop the bridge interface. 1110 */ 1111 static void 1112 bridge_stop(struct ifnet *ifp, int disable) 1113 { 1114 struct bridge_softc *sc = ifp->if_softc; 1115 1116 if ((ifp->if_flags & IFF_RUNNING) == 0) 1117 return; 1118 1119 callout_stop(&sc->sc_brcallout); 1120 bstp_stop(sc); 1121 1122 IF_PURGE(&ifp->if_snd); 1123 1124 bridge_rtflush(sc, IFBF_FLUSHDYN); 1125 1126 ifp->if_flags &= ~IFF_RUNNING; 1127 } 1128 1129 /* 1130 * bridge_enqueue: 1131 * 1132 * Enqueue a packet on a bridge member interface. 1133 * 1134 * NOTE: must be called at splnet(). 1135 */ 1136 void 1137 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1138 int runfilt) 1139 { 1140 ALTQ_DECL(struct altq_pktattr pktattr;) 1141 int len, error; 1142 short mflags; 1143 1144 /* 1145 * Clear any in-bound checksum flags for this packet. 1146 */ 1147 m->m_pkthdr.csum_flags = 0; 1148 1149 #ifdef PFIL_HOOKS 1150 if (runfilt) { 1151 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1152 dst_ifp, PFIL_OUT) != 0) { 1153 if (m != NULL) 1154 m_freem(m); 1155 return; 1156 } 1157 if (m == NULL) 1158 return; 1159 } 1160 #endif /* PFIL_HOOKS */ 1161 1162 #ifdef ALTQ 1163 /* 1164 * If ALTQ is enabled on the member interface, do 1165 * classification; the queueing discipline might 1166 * not require classification, but might require 1167 * the address family/header pointer in the pktattr. 1168 */ 1169 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1170 /* XXX IFT_ETHER */ 1171 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1172 } 1173 #endif /* ALTQ */ 1174 1175 len = m->m_pkthdr.len; 1176 m->m_flags |= M_PROTO1; 1177 mflags = m->m_flags; 1178 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1179 if (error) { 1180 /* mbuf is already freed */ 1181 sc->sc_if.if_oerrors++; 1182 return; 1183 } 1184 1185 sc->sc_if.if_opackets++; 1186 sc->sc_if.if_obytes += len; 1187 1188 dst_ifp->if_obytes += len; 1189 1190 if (mflags & M_MCAST) { 1191 sc->sc_if.if_omcasts++; 1192 dst_ifp->if_omcasts++; 1193 } 1194 1195 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1196 (*dst_ifp->if_start)(dst_ifp); 1197 } 1198 1199 /* 1200 * bridge_output: 1201 * 1202 * Send output from a bridge member interface. This 1203 * performs the bridging function for locally originated 1204 * packets. 1205 * 1206 * The mbuf has the Ethernet header already attached. We must 1207 * enqueue or free the mbuf before returning. 1208 */ 1209 int 1210 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1211 struct rtentry *rt) 1212 { 1213 struct ether_header *eh; 1214 struct ifnet *dst_if; 1215 struct bridge_softc *sc; 1216 int s; 1217 1218 if (m->m_len < ETHER_HDR_LEN) { 1219 m = m_pullup(m, ETHER_HDR_LEN); 1220 if (m == NULL) 1221 return (0); 1222 } 1223 1224 eh = mtod(m, struct ether_header *); 1225 sc = ifp->if_bridge; 1226 1227 s = splnet(); 1228 1229 /* 1230 * If bridge is down, but the original output interface is up, 1231 * go ahead and send out that interface. Otherwise, the packet 1232 * is dropped below. 1233 */ 1234 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1235 dst_if = ifp; 1236 goto sendunicast; 1237 } 1238 1239 /* 1240 * If the packet is a multicast, or we don't know a better way to 1241 * get there, send to all interfaces. 1242 */ 1243 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1244 dst_if = NULL; 1245 else 1246 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1247 if (dst_if == NULL) { 1248 struct bridge_iflist *bif; 1249 struct mbuf *mc; 1250 int used = 0; 1251 1252 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1253 dst_if = bif->bif_ifp; 1254 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1255 continue; 1256 1257 /* 1258 * If this is not the original output interface, 1259 * and the interface is participating in spanning 1260 * tree, make sure the port is in a state that 1261 * allows forwarding. 1262 */ 1263 if (dst_if != ifp && 1264 (bif->bif_flags & IFBIF_STP) != 0) { 1265 switch (bif->bif_state) { 1266 case BSTP_IFSTATE_BLOCKING: 1267 case BSTP_IFSTATE_LISTENING: 1268 case BSTP_IFSTATE_DISABLED: 1269 continue; 1270 } 1271 } 1272 1273 if (LIST_NEXT(bif, bif_next) == NULL) { 1274 used = 1; 1275 mc = m; 1276 } else { 1277 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1278 if (mc == NULL) { 1279 sc->sc_if.if_oerrors++; 1280 continue; 1281 } 1282 } 1283 1284 bridge_enqueue(sc, dst_if, mc, 0); 1285 } 1286 if (used == 0) 1287 m_freem(m); 1288 splx(s); 1289 return (0); 1290 } 1291 1292 sendunicast: 1293 /* 1294 * XXX Spanning tree consideration here? 1295 */ 1296 1297 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1298 m_freem(m); 1299 splx(s); 1300 return (0); 1301 } 1302 1303 bridge_enqueue(sc, dst_if, m, 0); 1304 1305 splx(s); 1306 return (0); 1307 } 1308 1309 /* 1310 * bridge_start: 1311 * 1312 * Start output on a bridge. 1313 * 1314 * NOTE: This routine should never be called in this implementation. 1315 */ 1316 static void 1317 bridge_start(struct ifnet *ifp) 1318 { 1319 1320 printf("%s: bridge_start() called\n", ifp->if_xname); 1321 } 1322 1323 /* 1324 * bridge_forward: 1325 * 1326 * The forwarding function of the bridge. 1327 */ 1328 static void 1329 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1330 { 1331 struct bridge_iflist *bif; 1332 struct ifnet *src_if, *dst_if; 1333 struct ether_header *eh; 1334 1335 src_if = m->m_pkthdr.rcvif; 1336 1337 sc->sc_if.if_ipackets++; 1338 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1339 1340 /* 1341 * Look up the bridge_iflist. 1342 */ 1343 bif = bridge_lookup_member_if(sc, src_if); 1344 if (bif == NULL) { 1345 /* Interface is not a bridge member (anymore?) */ 1346 m_freem(m); 1347 return; 1348 } 1349 1350 if (bif->bif_flags & IFBIF_STP) { 1351 switch (bif->bif_state) { 1352 case BSTP_IFSTATE_BLOCKING: 1353 case BSTP_IFSTATE_LISTENING: 1354 case BSTP_IFSTATE_DISABLED: 1355 m_freem(m); 1356 return; 1357 } 1358 } 1359 1360 eh = mtod(m, struct ether_header *); 1361 1362 /* 1363 * If the interface is learning, and the source 1364 * address is valid and not multicast, record 1365 * the address. 1366 */ 1367 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1368 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1369 (eh->ether_shost[0] == 0 && 1370 eh->ether_shost[1] == 0 && 1371 eh->ether_shost[2] == 0 && 1372 eh->ether_shost[3] == 0 && 1373 eh->ether_shost[4] == 0 && 1374 eh->ether_shost[5] == 0) == 0) { 1375 (void) bridge_rtupdate(sc, eh->ether_shost, 1376 src_if, 0, IFBAF_DYNAMIC); 1377 } 1378 1379 if ((bif->bif_flags & IFBIF_STP) != 0 && 1380 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1381 m_freem(m); 1382 return; 1383 } 1384 1385 /* 1386 * At this point, the port either doesn't participate 1387 * in spanning tree or it is in the forwarding state. 1388 */ 1389 1390 /* 1391 * If the packet is unicast, destined for someone on 1392 * "this" side of the bridge, drop it. 1393 */ 1394 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1395 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1396 if (src_if == dst_if) { 1397 m_freem(m); 1398 return; 1399 } 1400 } else { 1401 /* ...forward it to all interfaces. */ 1402 sc->sc_if.if_imcasts++; 1403 dst_if = NULL; 1404 } 1405 1406 #ifdef PFIL_HOOKS 1407 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1408 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1409 if (m != NULL) 1410 m_freem(m); 1411 return; 1412 } 1413 if (m == NULL) 1414 return; 1415 #endif /* PFIL_HOOKS */ 1416 1417 if (dst_if == NULL) { 1418 bridge_broadcast(sc, src_if, m); 1419 return; 1420 } 1421 1422 /* 1423 * At this point, we're dealing with a unicast frame 1424 * going to a different interface. 1425 */ 1426 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1427 m_freem(m); 1428 return; 1429 } 1430 bif = bridge_lookup_member_if(sc, dst_if); 1431 if (bif == NULL) { 1432 /* Not a member of the bridge (anymore?) */ 1433 m_freem(m); 1434 return; 1435 } 1436 1437 if (bif->bif_flags & IFBIF_STP) { 1438 switch (bif->bif_state) { 1439 case BSTP_IFSTATE_DISABLED: 1440 case BSTP_IFSTATE_BLOCKING: 1441 m_freem(m); 1442 return; 1443 } 1444 } 1445 1446 bridge_enqueue(sc, dst_if, m, 1); 1447 } 1448 1449 /* 1450 * bridge_input: 1451 * 1452 * Receive input from a member interface. Queue the packet for 1453 * bridging if it is not for us. 1454 */ 1455 struct mbuf * 1456 bridge_input(struct ifnet *ifp, struct mbuf *m) 1457 { 1458 struct bridge_softc *sc = ifp->if_bridge; 1459 struct bridge_iflist *bif; 1460 struct ether_header *eh; 1461 struct mbuf *mc; 1462 1463 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1464 return (m); 1465 1466 bif = bridge_lookup_member_if(sc, ifp); 1467 if (bif == NULL) 1468 return (m); 1469 1470 eh = mtod(m, struct ether_header *); 1471 1472 if (m->m_flags & (M_BCAST|M_MCAST)) { 1473 /* Tap off 802.1D packets; they do not get forwarded. */ 1474 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1475 ETHER_ADDR_LEN) == 0) { 1476 m = bstp_input(ifp, m); 1477 if (m == NULL) 1478 return (NULL); 1479 } 1480 1481 if (bif->bif_flags & IFBIF_STP) { 1482 switch (bif->bif_state) { 1483 case BSTP_IFSTATE_BLOCKING: 1484 case BSTP_IFSTATE_LISTENING: 1485 case BSTP_IFSTATE_DISABLED: 1486 return (m); 1487 } 1488 } 1489 1490 /* 1491 * Make a deep copy of the packet and enqueue the copy 1492 * for bridge processing; return the original packet for 1493 * local processing. 1494 */ 1495 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1496 if (mc == NULL) 1497 return (m); 1498 1499 /* Perform the bridge forwarding function with the copy. */ 1500 #if NGIF > 0 1501 if (ifp->if_type == IFT_GIF) { 1502 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1503 if (bif->bif_ifp->if_type == IFT_ETHER) 1504 break; 1505 } 1506 if (bif != NULL) { 1507 m->m_flags |= M_PROTO1; 1508 m->m_pkthdr.rcvif = bif->bif_ifp; 1509 (*bif->bif_ifp->if_input)(bif->bif_ifp, m); 1510 m = NULL; 1511 } 1512 } 1513 #endif 1514 bridge_forward(sc, mc); 1515 1516 /* Return the original packet for local processing. */ 1517 return (m); 1518 } 1519 1520 if (bif->bif_flags & IFBIF_STP) { 1521 switch (bif->bif_state) { 1522 case BSTP_IFSTATE_BLOCKING: 1523 case BSTP_IFSTATE_LISTENING: 1524 case BSTP_IFSTATE_DISABLED: 1525 return (m); 1526 } 1527 } 1528 1529 /* 1530 * Unicast. Make sure it's not for us. 1531 */ 1532 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1533 if(bif->bif_ifp->if_type != IFT_ETHER) 1534 continue; 1535 /* It is destined for us. */ 1536 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1537 ETHER_ADDR_LEN) == 0) { 1538 if (bif->bif_flags & IFBIF_LEARNING) 1539 (void) bridge_rtupdate(sc, 1540 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1541 m->m_pkthdr.rcvif = bif->bif_ifp; 1542 #if NGIF > 0 1543 if (ifp->if_type == IFT_GIF) { 1544 m->m_flags |= M_PROTO1; 1545 m->m_pkthdr.rcvif = bif->bif_ifp; 1546 (*bif->bif_ifp->if_input)(bif->bif_ifp, m); 1547 m = NULL; 1548 } 1549 #endif 1550 return (m); 1551 } 1552 1553 /* We just received a packet that we sent out. */ 1554 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1555 ETHER_ADDR_LEN) == 0) { 1556 m_freem(m); 1557 return (NULL); 1558 } 1559 } 1560 1561 /* Perform the bridge forwarding function. */ 1562 bridge_forward(sc, m); 1563 1564 return (NULL); 1565 } 1566 1567 /* 1568 * bridge_broadcast: 1569 * 1570 * Send a frame to all interfaces that are members of 1571 * the bridge, except for the one on which the packet 1572 * arrived. 1573 */ 1574 static void 1575 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1576 struct mbuf *m) 1577 { 1578 struct bridge_iflist *bif; 1579 struct mbuf *mc; 1580 struct ifnet *dst_if; 1581 int used = 0; 1582 1583 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1584 dst_if = bif->bif_ifp; 1585 if (dst_if == src_if) 1586 continue; 1587 1588 if (bif->bif_flags & IFBIF_STP) { 1589 switch (bif->bif_state) { 1590 case BSTP_IFSTATE_BLOCKING: 1591 case BSTP_IFSTATE_DISABLED: 1592 continue; 1593 } 1594 } 1595 1596 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1597 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1598 continue; 1599 1600 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1601 continue; 1602 1603 if (LIST_NEXT(bif, bif_next) == NULL) { 1604 mc = m; 1605 used = 1; 1606 } else { 1607 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1608 if (mc == NULL) { 1609 sc->sc_if.if_oerrors++; 1610 continue; 1611 } 1612 } 1613 1614 bridge_enqueue(sc, dst_if, mc, 1); 1615 } 1616 if (used == 0) 1617 m_freem(m); 1618 } 1619 1620 /* 1621 * bridge_rtupdate: 1622 * 1623 * Add a bridge routing entry. 1624 */ 1625 static int 1626 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1627 struct ifnet *dst_if, int setflags, uint8_t flags) 1628 { 1629 struct bridge_rtnode *brt; 1630 int error; 1631 1632 /* 1633 * A route for this destination might already exist. If so, 1634 * update it, otherwise create a new one. 1635 */ 1636 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1637 if (sc->sc_brtcnt >= sc->sc_brtmax) 1638 return (ENOSPC); 1639 1640 /* 1641 * Allocate a new bridge forwarding node, and 1642 * initialize the expiration time and Ethernet 1643 * address. 1644 */ 1645 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1646 if (brt == NULL) 1647 return (ENOMEM); 1648 1649 memset(brt, 0, sizeof(*brt)); 1650 brt->brt_expire = mono_time.tv_sec + sc->sc_brttimeout; 1651 brt->brt_flags = IFBAF_DYNAMIC; 1652 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1653 1654 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1655 pool_put(&bridge_rtnode_pool, brt); 1656 return (error); 1657 } 1658 } 1659 1660 brt->brt_ifp = dst_if; 1661 if (setflags) { 1662 brt->brt_flags = flags; 1663 brt->brt_expire = (flags & IFBAF_STATIC) ? 0 : 1664 mono_time.tv_sec + sc->sc_brttimeout; 1665 } 1666 1667 return (0); 1668 } 1669 1670 /* 1671 * bridge_rtlookup: 1672 * 1673 * Lookup the destination interface for an address. 1674 */ 1675 static struct ifnet * 1676 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1677 { 1678 struct bridge_rtnode *brt; 1679 1680 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1681 return (NULL); 1682 1683 return (brt->brt_ifp); 1684 } 1685 1686 /* 1687 * bridge_rttrim: 1688 * 1689 * Trim the routine table so that we have a number 1690 * of routing entries less than or equal to the 1691 * maximum number. 1692 */ 1693 static void 1694 bridge_rttrim(struct bridge_softc *sc) 1695 { 1696 struct bridge_rtnode *brt, *nbrt; 1697 1698 /* Make sure we actually need to do this. */ 1699 if (sc->sc_brtcnt <= sc->sc_brtmax) 1700 return; 1701 1702 /* Force an aging cycle; this might trim enough addresses. */ 1703 bridge_rtage(sc); 1704 if (sc->sc_brtcnt <= sc->sc_brtmax) 1705 return; 1706 1707 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1708 nbrt = LIST_NEXT(brt, brt_list); 1709 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1710 bridge_rtnode_destroy(sc, brt); 1711 if (sc->sc_brtcnt <= sc->sc_brtmax) 1712 return; 1713 } 1714 } 1715 } 1716 1717 /* 1718 * bridge_timer: 1719 * 1720 * Aging timer for the bridge. 1721 */ 1722 static void 1723 bridge_timer(void *arg) 1724 { 1725 struct bridge_softc *sc = arg; 1726 int s; 1727 1728 s = splnet(); 1729 bridge_rtage(sc); 1730 splx(s); 1731 1732 if (sc->sc_if.if_flags & IFF_RUNNING) 1733 callout_reset(&sc->sc_brcallout, 1734 bridge_rtable_prune_period * hz, bridge_timer, sc); 1735 } 1736 1737 /* 1738 * bridge_rtage: 1739 * 1740 * Perform an aging cycle. 1741 */ 1742 static void 1743 bridge_rtage(struct bridge_softc *sc) 1744 { 1745 struct bridge_rtnode *brt, *nbrt; 1746 1747 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1748 nbrt = LIST_NEXT(brt, brt_list); 1749 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1750 if (mono_time.tv_sec >= brt->brt_expire) 1751 bridge_rtnode_destroy(sc, brt); 1752 } 1753 } 1754 } 1755 1756 /* 1757 * bridge_rtflush: 1758 * 1759 * Remove all dynamic addresses from the bridge. 1760 */ 1761 static void 1762 bridge_rtflush(struct bridge_softc *sc, int full) 1763 { 1764 struct bridge_rtnode *brt, *nbrt; 1765 1766 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1767 nbrt = LIST_NEXT(brt, brt_list); 1768 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1769 bridge_rtnode_destroy(sc, brt); 1770 } 1771 } 1772 1773 /* 1774 * bridge_rtdaddr: 1775 * 1776 * Remove an address from the table. 1777 */ 1778 static int 1779 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1780 { 1781 struct bridge_rtnode *brt; 1782 1783 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1784 return (ENOENT); 1785 1786 bridge_rtnode_destroy(sc, brt); 1787 return (0); 1788 } 1789 1790 /* 1791 * bridge_rtdelete: 1792 * 1793 * Delete routes to a speicifc member interface. 1794 */ 1795 static void 1796 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1797 { 1798 struct bridge_rtnode *brt, *nbrt; 1799 1800 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1801 nbrt = LIST_NEXT(brt, brt_list); 1802 if (brt->brt_ifp == ifp) 1803 bridge_rtnode_destroy(sc, brt); 1804 } 1805 } 1806 1807 /* 1808 * bridge_rtable_init: 1809 * 1810 * Initialize the route table for this bridge. 1811 */ 1812 static int 1813 bridge_rtable_init(struct bridge_softc *sc) 1814 { 1815 int i; 1816 1817 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1818 M_DEVBUF, M_NOWAIT); 1819 if (sc->sc_rthash == NULL) 1820 return (ENOMEM); 1821 1822 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1823 LIST_INIT(&sc->sc_rthash[i]); 1824 1825 sc->sc_rthash_key = arc4random(); 1826 1827 LIST_INIT(&sc->sc_rtlist); 1828 1829 return (0); 1830 } 1831 1832 /* 1833 * bridge_rtable_fini: 1834 * 1835 * Deconstruct the route table for this bridge. 1836 */ 1837 static void 1838 bridge_rtable_fini(struct bridge_softc *sc) 1839 { 1840 1841 free(sc->sc_rthash, M_DEVBUF); 1842 } 1843 1844 /* 1845 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1846 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1847 */ 1848 #define mix(a, b, c) \ 1849 do { \ 1850 a -= b; a -= c; a ^= (c >> 13); \ 1851 b -= c; b -= a; b ^= (a << 8); \ 1852 c -= a; c -= b; c ^= (b >> 13); \ 1853 a -= b; a -= c; a ^= (c >> 12); \ 1854 b -= c; b -= a; b ^= (a << 16); \ 1855 c -= a; c -= b; c ^= (b >> 5); \ 1856 a -= b; a -= c; a ^= (c >> 3); \ 1857 b -= c; b -= a; b ^= (a << 10); \ 1858 c -= a; c -= b; c ^= (b >> 15); \ 1859 } while (/*CONSTCOND*/0) 1860 1861 static inline uint32_t 1862 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1863 { 1864 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1865 1866 b += addr[5] << 8; 1867 b += addr[4]; 1868 a += addr[3] << 24; 1869 a += addr[2] << 16; 1870 a += addr[1] << 8; 1871 a += addr[0]; 1872 1873 mix(a, b, c); 1874 1875 return (c & BRIDGE_RTHASH_MASK); 1876 } 1877 1878 #undef mix 1879 1880 /* 1881 * bridge_rtnode_lookup: 1882 * 1883 * Look up a bridge route node for the specified destination. 1884 */ 1885 static struct bridge_rtnode * 1886 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1887 { 1888 struct bridge_rtnode *brt; 1889 uint32_t hash; 1890 int dir; 1891 1892 hash = bridge_rthash(sc, addr); 1893 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1894 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1895 if (dir == 0) 1896 return (brt); 1897 if (dir > 0) 1898 return (NULL); 1899 } 1900 1901 return (NULL); 1902 } 1903 1904 /* 1905 * bridge_rtnode_insert: 1906 * 1907 * Insert the specified bridge node into the route table. We 1908 * assume the entry is not already in the table. 1909 */ 1910 static int 1911 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1912 { 1913 struct bridge_rtnode *lbrt; 1914 uint32_t hash; 1915 int dir; 1916 1917 hash = bridge_rthash(sc, brt->brt_addr); 1918 1919 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1920 if (lbrt == NULL) { 1921 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1922 goto out; 1923 } 1924 1925 do { 1926 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1927 if (dir == 0) 1928 return (EEXIST); 1929 if (dir > 0) { 1930 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1931 goto out; 1932 } 1933 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1934 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1935 goto out; 1936 } 1937 lbrt = LIST_NEXT(lbrt, brt_hash); 1938 } while (lbrt != NULL); 1939 1940 #ifdef DIAGNOSTIC 1941 panic("bridge_rtnode_insert: impossible"); 1942 #endif 1943 1944 out: 1945 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1946 sc->sc_brtcnt++; 1947 1948 return (0); 1949 } 1950 1951 /* 1952 * bridge_rtnode_destroy: 1953 * 1954 * Destroy a bridge rtnode. 1955 */ 1956 static void 1957 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1958 { 1959 1960 LIST_REMOVE(brt, brt_hash); 1961 1962 LIST_REMOVE(brt, brt_list); 1963 sc->sc_brtcnt--; 1964 pool_put(&bridge_rtnode_pool, brt); 1965 } 1966 1967 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1968 extern struct pfil_head inet_pfil_hook; /* XXX */ 1969 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1970 1971 /* 1972 * Send bridge packets through IPF if they are one of the types IPF can deal 1973 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1974 * question.) 1975 */ 1976 static int 1977 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1978 { 1979 int snap, error; 1980 struct ether_header *eh1, eh2; 1981 struct llc llc1; 1982 u_int16_t ether_type; 1983 1984 snap = 0; 1985 error = -1; /* Default error if not error == 0 */ 1986 eh1 = mtod(*mp, struct ether_header *); 1987 ether_type = ntohs(eh1->ether_type); 1988 1989 /* 1990 * Check for SNAP/LLC. 1991 */ 1992 if (ether_type < ETHERMTU) { 1993 struct llc *llc2 = (struct llc *)(eh1 + 1); 1994 1995 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1996 llc2->llc_dsap == LLC_SNAP_LSAP && 1997 llc2->llc_ssap == LLC_SNAP_LSAP && 1998 llc2->llc_control == LLC_UI) { 1999 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2000 snap = 1; 2001 } 2002 } 2003 2004 /* 2005 * If we're trying to filter bridge traffic, don't look at anything 2006 * other than IP and ARP traffic. If the filter doesn't understand 2007 * IPv6, don't allow IPv6 through the bridge either. This is lame 2008 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2009 * but of course we don't have an AppleTalk filter to begin with. 2010 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2011 * ARP traffic.) 2012 */ 2013 switch (ether_type) { 2014 case ETHERTYPE_ARP: 2015 case ETHERTYPE_REVARP: 2016 return 0; /* Automatically pass */ 2017 case ETHERTYPE_IP: 2018 # ifdef INET6 2019 case ETHERTYPE_IPV6: 2020 # endif /* INET6 */ 2021 break; 2022 default: 2023 goto bad; 2024 } 2025 2026 /* Strip off the Ethernet header and keep a copy. */ 2027 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 2028 m_adj(*mp, ETHER_HDR_LEN); 2029 2030 /* Strip off snap header, if present */ 2031 if (snap) { 2032 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 2033 m_adj(*mp, sizeof(struct llc)); 2034 } 2035 2036 /* 2037 * Check basic packet sanity and run IPF through pfil. 2038 */ 2039 switch (ether_type) 2040 { 2041 case ETHERTYPE_IP : 2042 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2043 if (error == 0) 2044 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2045 break; 2046 # ifdef INET6 2047 case ETHERTYPE_IPV6 : 2048 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2049 if (error == 0) 2050 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2051 break; 2052 # endif 2053 default : 2054 error = 0; 2055 break; 2056 } 2057 2058 if (*mp == NULL) 2059 return error; 2060 if (error != 0) 2061 goto bad; 2062 2063 error = -1; 2064 2065 /* 2066 * Finally, put everything back the way it was and return 2067 */ 2068 if (snap) { 2069 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2070 if (*mp == NULL) 2071 return error; 2072 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 2073 } 2074 2075 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2076 if (*mp == NULL) 2077 return error; 2078 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2079 2080 return 0; 2081 2082 bad: 2083 m_freem(*mp); 2084 *mp = NULL; 2085 return error; 2086 } 2087 2088 /* 2089 * Perform basic checks on header size since 2090 * IPF assumes ip_input has already processed 2091 * it for it. Cut-and-pasted from ip_input.c. 2092 * Given how simple the IPv6 version is, 2093 * does the IPv4 version really need to be 2094 * this complicated? 2095 * 2096 * XXX Should we update ipstat here, or not? 2097 * XXX Right now we update ipstat but not 2098 * XXX csum_counter. 2099 */ 2100 static int 2101 bridge_ip_checkbasic(struct mbuf **mp) 2102 { 2103 struct mbuf *m = *mp; 2104 struct ip *ip; 2105 int len, hlen; 2106 2107 if (*mp == NULL) 2108 return -1; 2109 2110 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2111 if ((m = m_copyup(m, sizeof(struct ip), 2112 (max_linkhdr + 3) & ~3)) == NULL) { 2113 /* XXXJRT new stat, please */ 2114 ipstat.ips_toosmall++; 2115 goto bad; 2116 } 2117 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2118 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2119 ipstat.ips_toosmall++; 2120 goto bad; 2121 } 2122 } 2123 ip = mtod(m, struct ip *); 2124 if (ip == NULL) goto bad; 2125 2126 if (ip->ip_v != IPVERSION) { 2127 ipstat.ips_badvers++; 2128 goto bad; 2129 } 2130 hlen = ip->ip_hl << 2; 2131 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2132 ipstat.ips_badhlen++; 2133 goto bad; 2134 } 2135 if (hlen > m->m_len) { 2136 if ((m = m_pullup(m, hlen)) == 0) { 2137 ipstat.ips_badhlen++; 2138 goto bad; 2139 } 2140 ip = mtod(m, struct ip *); 2141 if (ip == NULL) goto bad; 2142 } 2143 2144 switch (m->m_pkthdr.csum_flags & 2145 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2146 M_CSUM_IPv4_BAD)) { 2147 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2148 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2149 goto bad; 2150 2151 case M_CSUM_IPv4: 2152 /* Checksum was okay. */ 2153 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2154 break; 2155 2156 default: 2157 /* Must compute it ourselves. */ 2158 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2159 if (in_cksum(m, hlen) != 0) 2160 goto bad; 2161 break; 2162 } 2163 2164 /* Retrieve the packet length. */ 2165 len = ntohs(ip->ip_len); 2166 2167 /* 2168 * Check for additional length bogosity 2169 */ 2170 if (len < hlen) { 2171 ipstat.ips_badlen++; 2172 goto bad; 2173 } 2174 2175 /* 2176 * Check that the amount of data in the buffers 2177 * is as at least much as the IP header would have us expect. 2178 * Drop packet if shorter than we expect. 2179 */ 2180 if (m->m_pkthdr.len < len) { 2181 ipstat.ips_tooshort++; 2182 goto bad; 2183 } 2184 2185 /* Checks out, proceed */ 2186 *mp = m; 2187 return 0; 2188 2189 bad: 2190 *mp = m; 2191 return -1; 2192 } 2193 2194 # ifdef INET6 2195 /* 2196 * Same as above, but for IPv6. 2197 * Cut-and-pasted from ip6_input.c. 2198 * XXX Should we update ip6stat, or not? 2199 */ 2200 static int 2201 bridge_ip6_checkbasic(struct mbuf **mp) 2202 { 2203 struct mbuf *m = *mp; 2204 struct ip6_hdr *ip6; 2205 2206 /* 2207 * If the IPv6 header is not aligned, slurp it up into a new 2208 * mbuf with space for link headers, in the event we forward 2209 * it. Otherwise, if it is aligned, make sure the entire base 2210 * IPv6 header is in the first mbuf of the chain. 2211 */ 2212 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2213 struct ifnet *inifp = m->m_pkthdr.rcvif; 2214 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2215 (max_linkhdr + 3) & ~3)) == NULL) { 2216 /* XXXJRT new stat, please */ 2217 ip6stat.ip6s_toosmall++; 2218 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2219 goto bad; 2220 } 2221 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2222 struct ifnet *inifp = m->m_pkthdr.rcvif; 2223 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2224 ip6stat.ip6s_toosmall++; 2225 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2226 goto bad; 2227 } 2228 } 2229 2230 ip6 = mtod(m, struct ip6_hdr *); 2231 2232 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2233 ip6stat.ip6s_badvers++; 2234 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2235 goto bad; 2236 } 2237 2238 /* Checks out, proceed */ 2239 *mp = m; 2240 return 0; 2241 2242 bad: 2243 *mp = m; 2244 return -1; 2245 } 2246 # endif /* INET6 */ 2247 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2248
Indexes created Thu Oct 02 14:10:14 GMT 2025