if_bridge.c revision 1.10
1 /* $NetBSD: if_bridge.c,v 1.10 2003/02/27 19:22:49 perseant Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 * 81 * - Add packet filter hooks. 82 */ 83 84 #include <sys/cdefs.h> 85 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.10 2003/02/27 19:22:49 perseant Exp $"); 86 87 #include "opt_bridge_ipf.h" 88 #include "bpfilter.h" 89 #include "rnd.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 NRND > 0 102 #include <sys/rnd.h> 103 #endif 104 105 #if NBPFILTER > 0 106 #include <net/bpf.h> 107 #endif 108 #include <net/if.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_llc.h> 112 113 #include <net/if_ether.h> 114 #include <net/if_bridgevar.h> 115 116 #ifdef BRIDGE_IPF /* Used for bridge_ip[6]_checkbasic */ 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 122 #include <netinet/ip6.h> 123 #include <netinet6/in6_var.h> 124 #include <netinet6/ip6_var.h> 125 #endif /* BRIDGE_IPF */ 126 127 /* 128 * Size of the route hash table. Must be a power of two. 129 */ 130 #ifndef BRIDGE_RTHASH_SIZE 131 #define BRIDGE_RTHASH_SIZE 1024 132 #endif 133 134 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 135 136 /* 137 * Maximum number of addresses to cache. 138 */ 139 #ifndef BRIDGE_RTABLE_MAX 140 #define BRIDGE_RTABLE_MAX 100 141 #endif 142 143 /* 144 * Spanning tree defaults. 145 */ 146 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 147 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 148 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 149 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 150 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 151 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 152 #define BSTP_DEFAULT_PATH_COST 55 153 154 /* 155 * Timeout (in seconds) for entries learned dynamically. 156 */ 157 #ifndef BRIDGE_RTABLE_TIMEOUT 158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 159 #endif 160 161 /* 162 * Number of seconds between walks of the route list. 163 */ 164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 166 #endif 167 168 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 169 170 struct pool bridge_rtnode_pool; 171 172 void bridgeattach(int); 173 174 int bridge_clone_create(struct if_clone *, int); 175 void bridge_clone_destroy(struct ifnet *); 176 177 int bridge_ioctl(struct ifnet *, u_long, caddr_t); 178 int bridge_init(struct ifnet *); 179 void bridge_stop(struct ifnet *, int); 180 void bridge_start(struct ifnet *); 181 182 void bridge_forward(struct bridge_softc *, struct mbuf *m); 183 184 void bridge_timer(void *); 185 186 void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *); 187 188 int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 189 struct ifnet *, int, uint8_t); 190 struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 191 void bridge_rttrim(struct bridge_softc *); 192 void bridge_rtage(struct bridge_softc *); 193 void bridge_rtflush(struct bridge_softc *, int); 194 int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 195 void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 196 197 int bridge_rtable_init(struct bridge_softc *); 198 void bridge_rtable_fini(struct bridge_softc *); 199 200 struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 201 const uint8_t *); 202 int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); 203 void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); 204 205 struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 206 const char *name); 207 struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 208 struct ifnet *ifp); 209 void bridge_delete_member(struct bridge_softc *, struct bridge_iflist *); 210 211 int bridge_ioctl_add(struct bridge_softc *, void *); 212 int bridge_ioctl_del(struct bridge_softc *, void *); 213 int bridge_ioctl_gifflags(struct bridge_softc *, void *); 214 int bridge_ioctl_sifflags(struct bridge_softc *, void *); 215 int bridge_ioctl_scache(struct bridge_softc *, void *); 216 int bridge_ioctl_gcache(struct bridge_softc *, void *); 217 int bridge_ioctl_gifs(struct bridge_softc *, void *); 218 int bridge_ioctl_rts(struct bridge_softc *, void *); 219 int bridge_ioctl_saddr(struct bridge_softc *, void *); 220 int bridge_ioctl_sto(struct bridge_softc *, void *); 221 int bridge_ioctl_gto(struct bridge_softc *, void *); 222 int bridge_ioctl_daddr(struct bridge_softc *, void *); 223 int bridge_ioctl_flush(struct bridge_softc *, void *); 224 int bridge_ioctl_gpri(struct bridge_softc *, void *); 225 int bridge_ioctl_spri(struct bridge_softc *, void *); 226 int bridge_ioctl_ght(struct bridge_softc *, void *); 227 int bridge_ioctl_sht(struct bridge_softc *, void *); 228 int bridge_ioctl_gfd(struct bridge_softc *, void *); 229 int bridge_ioctl_sfd(struct bridge_softc *, void *); 230 int bridge_ioctl_gma(struct bridge_softc *, void *); 231 int bridge_ioctl_sma(struct bridge_softc *, void *); 232 int bridge_ioctl_sifprio(struct bridge_softc *, void *); 233 #ifdef BRIDGE_IPF 234 int bridge_ioctl_gfilt(struct bridge_softc *, void *); 235 int bridge_ioctl_sfilt(struct bridge_softc *, void *); 236 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 237 static int bridge_ip_checkbasic(struct mbuf **mp); 238 # ifdef INET6 239 static int bridge_ip6_checkbasic(struct mbuf **mp); 240 # endif /* INET6 */ 241 #endif /* BRIDGE_IPF */ 242 243 struct bridge_control { 244 int (*bc_func)(struct bridge_softc *, void *); 245 int bc_argsize; 246 int bc_flags; 247 }; 248 249 #define BC_F_COPYIN 0x01 /* copy arguments in */ 250 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 251 #define BC_F_SUSER 0x04 /* do super-user check */ 252 253 const struct bridge_control bridge_control_table[] = { 254 { bridge_ioctl_add, sizeof(struct ifbreq), 255 BC_F_COPYIN|BC_F_SUSER }, 256 { bridge_ioctl_del, sizeof(struct ifbreq), 257 BC_F_COPYIN|BC_F_SUSER }, 258 259 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 260 BC_F_COPYIN|BC_F_COPYOUT }, 261 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 262 BC_F_COPYIN|BC_F_SUSER }, 263 264 { bridge_ioctl_scache, sizeof(struct ifbrparam), 265 BC_F_COPYIN|BC_F_SUSER }, 266 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 267 BC_F_COPYOUT }, 268 269 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 270 BC_F_COPYIN|BC_F_COPYOUT }, 271 { bridge_ioctl_rts, sizeof(struct ifbaconf), 272 BC_F_COPYIN|BC_F_COPYOUT }, 273 274 { bridge_ioctl_saddr, sizeof(struct ifbareq), 275 BC_F_COPYIN|BC_F_SUSER }, 276 277 { bridge_ioctl_sto, sizeof(struct ifbrparam), 278 BC_F_COPYIN|BC_F_SUSER }, 279 { bridge_ioctl_gto, sizeof(struct ifbrparam), 280 BC_F_COPYOUT }, 281 282 { bridge_ioctl_daddr, sizeof(struct ifbareq), 283 BC_F_COPYIN|BC_F_SUSER }, 284 285 { bridge_ioctl_flush, sizeof(struct ifbreq), 286 BC_F_COPYIN|BC_F_SUSER }, 287 288 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 289 BC_F_COPYOUT }, 290 { bridge_ioctl_spri, sizeof(struct ifbrparam), 291 BC_F_COPYIN|BC_F_SUSER }, 292 293 { bridge_ioctl_ght, sizeof(struct ifbrparam), 294 BC_F_COPYOUT }, 295 { bridge_ioctl_sht, sizeof(struct ifbrparam), 296 BC_F_COPYIN|BC_F_SUSER }, 297 298 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 299 BC_F_COPYOUT }, 300 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 301 BC_F_COPYIN|BC_F_SUSER }, 302 303 { bridge_ioctl_gma, sizeof(struct ifbrparam), 304 BC_F_COPYOUT }, 305 { bridge_ioctl_sma, sizeof(struct ifbrparam), 306 BC_F_COPYIN|BC_F_SUSER }, 307 308 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 309 BC_F_COPYIN|BC_F_SUSER }, 310 #ifdef BRIDGE_IPF 311 { bridge_ioctl_gfilt, sizeof(struct ifbrparam), 312 BC_F_COPYOUT }, 313 { bridge_ioctl_sfilt, sizeof(struct ifbrparam), 314 BC_F_COPYIN|BC_F_SUSER }, 315 #endif /* BRIDGE_IPF */ 316 }; 317 const int bridge_control_table_size = 318 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 319 320 LIST_HEAD(, bridge_softc) bridge_list; 321 322 struct if_clone bridge_cloner = 323 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 324 325 /* 326 * bridgeattach: 327 * 328 * Pseudo-device attach routine. 329 */ 330 void 331 bridgeattach(int n) 332 { 333 334 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 335 0, 0, 0, "brtpl", NULL); 336 337 LIST_INIT(&bridge_list); 338 if_clone_attach(&bridge_cloner); 339 } 340 341 /* 342 * bridge_clone_create: 343 * 344 * Create a new bridge instance. 345 */ 346 int 347 bridge_clone_create(struct if_clone *ifc, int unit) 348 { 349 struct bridge_softc *sc; 350 struct ifnet *ifp; 351 int s; 352 353 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK); 354 memset(sc, 0, sizeof(*sc)); 355 ifp = &sc->sc_if; 356 357 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 358 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 359 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 360 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 361 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 362 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 363 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 364 sc->sc_filter_flags = 0; 365 366 /* Initialize our routing table. */ 367 bridge_rtable_init(sc); 368 369 callout_init(&sc->sc_brcallout); 370 callout_init(&sc->sc_bstpcallout); 371 372 LIST_INIT(&sc->sc_iflist); 373 374 sprintf(ifp->if_xname, "%s%d", ifc->ifc_name, unit); 375 ifp->if_softc = sc; 376 ifp->if_mtu = ETHERMTU; 377 ifp->if_ioctl = bridge_ioctl; 378 ifp->if_output = bridge_output; 379 ifp->if_start = bridge_start; 380 ifp->if_stop = bridge_stop; 381 ifp->if_init = bridge_init; 382 ifp->if_type = IFT_BRIDGE; 383 ifp->if_addrlen = 0; 384 ifp->if_dlt = DLT_EN10MB; 385 ifp->if_hdrlen = ETHER_HDR_LEN; 386 387 if_attach(ifp); 388 389 if_alloc_sadl(ifp); 390 391 s = splnet(); 392 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 393 splx(s); 394 395 return (0); 396 } 397 398 /* 399 * bridge_clone_destroy: 400 * 401 * Destroy a bridge instance. 402 */ 403 void 404 bridge_clone_destroy(struct ifnet *ifp) 405 { 406 struct bridge_softc *sc = ifp->if_softc; 407 struct bridge_iflist *bif; 408 int s; 409 410 s = splnet(); 411 412 bridge_stop(ifp, 1); 413 414 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 415 bridge_delete_member(sc, bif); 416 417 LIST_REMOVE(sc, sc_list); 418 419 splx(s); 420 421 if_detach(ifp); 422 423 /* Tear down the routing table. */ 424 bridge_rtable_fini(sc); 425 426 free(sc, M_DEVBUF); 427 } 428 429 /* 430 * bridge_ioctl: 431 * 432 * Handle a control request from the operator. 433 */ 434 int 435 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 436 { 437 struct bridge_softc *sc = ifp->if_softc; 438 struct proc *p = curproc; /* XXX */ 439 union { 440 struct ifbreq ifbreq; 441 struct ifbifconf ifbifconf; 442 struct ifbareq ifbareq; 443 struct ifbaconf ifbaconf; 444 struct ifbrparam ifbrparam; 445 } args; 446 struct ifdrv *ifd = (struct ifdrv *) data; 447 const struct bridge_control *bc; 448 int s, error = 0; 449 450 s = splnet(); 451 452 switch (cmd) { 453 case SIOCGDRVSPEC: 454 case SIOCSDRVSPEC: 455 if (ifd->ifd_cmd >= bridge_control_table_size) { 456 error = EINVAL; 457 break; 458 } 459 bc = &bridge_control_table[ifd->ifd_cmd]; 460 461 if (cmd == SIOCGDRVSPEC && 462 (bc->bc_flags & BC_F_COPYOUT) == 0) 463 return (EINVAL); 464 else if (cmd == SIOCSDRVSPEC && 465 (bc->bc_flags & BC_F_COPYOUT) != 0) 466 return (EINVAL); 467 468 if (bc->bc_flags & BC_F_SUSER) { 469 error = suser(p->p_ucred, &p->p_acflag); 470 if (error) 471 break; 472 } 473 474 if (ifd->ifd_len != bc->bc_argsize || 475 ifd->ifd_len > sizeof(args)) { 476 error = EINVAL; 477 break; 478 } 479 480 if (bc->bc_flags & BC_F_COPYIN) { 481 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 482 if (error) 483 break; 484 } 485 486 error = (*bc->bc_func)(sc, &args); 487 if (error) 488 break; 489 490 if (bc->bc_flags & BC_F_COPYOUT) 491 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 492 493 break; 494 495 case SIOCSIFFLAGS: 496 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 497 /* 498 * If interface is marked down and it is running, 499 * then stop and disable it. 500 */ 501 (*ifp->if_stop)(ifp, 1); 502 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 503 /* 504 * If interface is marked up and it is stopped, then 505 * start it. 506 */ 507 error = (*ifp->if_init)(ifp); 508 } 509 break; 510 511 default: 512 error = ENOTTY; 513 break; 514 } 515 516 splx(s); 517 518 return (error); 519 } 520 521 /* 522 * bridge_lookup_member: 523 * 524 * Lookup a bridge member interface. Must be called at splnet(). 525 */ 526 struct bridge_iflist * 527 bridge_lookup_member(struct bridge_softc *sc, const char *name) 528 { 529 struct bridge_iflist *bif; 530 struct ifnet *ifp; 531 532 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 533 ifp = bif->bif_ifp; 534 if (strcmp(ifp->if_xname, name) == 0) 535 return (bif); 536 } 537 538 return (NULL); 539 } 540 541 /* 542 * bridge_lookup_member_if: 543 * 544 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 545 */ 546 struct bridge_iflist * 547 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 548 { 549 struct bridge_iflist *bif; 550 551 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 552 if (bif->bif_ifp == member_ifp) 553 return (bif); 554 } 555 556 return (NULL); 557 } 558 559 /* 560 * bridge_delete_member: 561 * 562 * Delete the specified member interface. 563 */ 564 void 565 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 566 { 567 struct ifnet *ifs = bif->bif_ifp; 568 569 switch (ifs->if_type) { 570 case IFT_ETHER: 571 /* 572 * Take the interface out of promiscuous mode. 573 */ 574 (void) ifpromisc(ifs, 0); 575 break; 576 577 default: 578 #ifdef DIAGNOSTIC 579 panic("bridge_delete_member: impossible"); 580 #endif 581 break; 582 } 583 584 ifs->if_bridge = NULL; 585 LIST_REMOVE(bif, bif_next); 586 587 bridge_rtdelete(sc, ifs); 588 589 free(bif, M_DEVBUF); 590 591 if (sc->sc_if.if_flags & IFF_RUNNING) 592 bstp_initialization(sc); 593 } 594 595 int 596 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 597 { 598 struct ifbreq *req = arg; 599 struct bridge_iflist *bif = NULL; 600 struct ifnet *ifs; 601 int error = 0; 602 603 ifs = ifunit(req->ifbr_ifsname); 604 if (ifs == NULL) 605 return (ENOENT); 606 607 if (sc->sc_if.if_mtu != ifs->if_mtu) 608 return (EINVAL); 609 610 if (ifs->if_bridge == sc) 611 return (EEXIST); 612 613 if (ifs->if_bridge != NULL) 614 return (EBUSY); 615 616 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 617 if (bif == NULL) 618 return (ENOMEM); 619 620 switch (ifs->if_type) { 621 case IFT_ETHER: 622 /* 623 * Place the interface into promiscuous mode. 624 */ 625 error = ifpromisc(ifs, 1); 626 if (error) 627 goto out; 628 break; 629 630 default: 631 error = EINVAL; 632 goto out; 633 } 634 635 bif->bif_ifp = ifs; 636 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 637 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 638 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 639 640 ifs->if_bridge = sc; 641 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 642 643 if (sc->sc_if.if_flags & IFF_RUNNING) 644 bstp_initialization(sc); 645 else 646 bstp_stop(sc); 647 648 out: 649 if (error) { 650 if (bif != NULL) 651 free(bif, M_DEVBUF); 652 } 653 return (error); 654 } 655 656 int 657 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 658 { 659 struct ifbreq *req = arg; 660 struct bridge_iflist *bif; 661 662 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 663 if (bif == NULL) 664 return (ENOENT); 665 666 bridge_delete_member(sc, bif); 667 668 return (0); 669 } 670 671 int 672 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 673 { 674 struct ifbreq *req = arg; 675 struct bridge_iflist *bif; 676 677 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 678 if (bif == NULL) 679 return (ENOENT); 680 681 req->ifbr_ifsflags = bif->bif_flags; 682 req->ifbr_state = bif->bif_state; 683 req->ifbr_priority = bif->bif_priority; 684 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 685 686 return (0); 687 } 688 689 int 690 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 691 { 692 struct ifbreq *req = arg; 693 struct bridge_iflist *bif; 694 695 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 696 if (bif == NULL) 697 return (ENOENT); 698 699 if (req->ifbr_ifsflags & IFBIF_STP) { 700 switch (bif->bif_ifp->if_type) { 701 case IFT_ETHER: 702 /* These can do spanning tree. */ 703 break; 704 705 default: 706 /* Nothing else can. */ 707 return (EINVAL); 708 } 709 } 710 711 bif->bif_flags = req->ifbr_ifsflags; 712 713 if (sc->sc_if.if_flags & IFF_RUNNING) 714 bstp_initialization(sc); 715 716 return (0); 717 } 718 719 int 720 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 721 { 722 struct ifbrparam *param = arg; 723 724 sc->sc_brtmax = param->ifbrp_csize; 725 bridge_rttrim(sc); 726 727 return (0); 728 } 729 730 int 731 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 732 { 733 struct ifbrparam *param = arg; 734 735 param->ifbrp_csize = sc->sc_brtmax; 736 737 return (0); 738 } 739 740 int 741 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 742 { 743 struct ifbifconf *bifc = arg; 744 struct bridge_iflist *bif; 745 struct ifbreq breq; 746 int count, len, error = 0; 747 748 count = 0; 749 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 750 count++; 751 752 if (bifc->ifbic_len == 0) { 753 bifc->ifbic_len = sizeof(breq) * count; 754 return (0); 755 } 756 757 count = 0; 758 len = bifc->ifbic_len; 759 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 760 if (len < sizeof(breq)) 761 break; 762 763 strcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname); 764 breq.ifbr_ifsflags = bif->bif_flags; 765 breq.ifbr_state = bif->bif_state; 766 breq.ifbr_priority = bif->bif_priority; 767 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 768 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 769 if (error) 770 break; 771 count++; 772 len -= sizeof(breq); 773 } 774 775 bifc->ifbic_len = sizeof(breq) * count; 776 return (error); 777 } 778 779 int 780 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 781 { 782 struct ifbaconf *bac = arg; 783 struct bridge_rtnode *brt; 784 struct ifbareq bareq; 785 int count = 0, error = 0, len; 786 787 if (bac->ifbac_len == 0) 788 return (0); 789 790 len = bac->ifbac_len; 791 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 792 if (len < sizeof(bareq)) 793 goto out; 794 strcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname); 795 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 796 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 797 bareq.ifba_expire = brt->brt_expire - mono_time.tv_sec; 798 else 799 bareq.ifba_expire = 0; 800 bareq.ifba_flags = brt->brt_flags; 801 802 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 803 if (error) 804 goto out; 805 count++; 806 len -= sizeof(bareq); 807 } 808 out: 809 bac->ifbac_len = sizeof(bareq) * count; 810 return (error); 811 } 812 813 int 814 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 815 { 816 struct ifbareq *req = arg; 817 struct bridge_iflist *bif; 818 int error; 819 820 bif = bridge_lookup_member(sc, req->ifba_ifsname); 821 if (bif == NULL) 822 return (ENOENT); 823 824 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 825 req->ifba_flags); 826 827 return (error); 828 } 829 830 int 831 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 832 { 833 struct ifbrparam *param = arg; 834 835 sc->sc_brttimeout = param->ifbrp_ctime; 836 837 return (0); 838 } 839 840 int 841 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 842 { 843 struct ifbrparam *param = arg; 844 845 param->ifbrp_ctime = sc->sc_brttimeout; 846 847 return (0); 848 } 849 850 int 851 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 852 { 853 struct ifbareq *req = arg; 854 855 return (bridge_rtdaddr(sc, req->ifba_dst)); 856 } 857 858 int 859 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 860 { 861 struct ifbreq *req = arg; 862 863 bridge_rtflush(sc, req->ifbr_ifsflags); 864 865 return (0); 866 } 867 868 int 869 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 870 { 871 struct ifbrparam *param = arg; 872 873 param->ifbrp_prio = sc->sc_bridge_priority; 874 875 return (0); 876 } 877 878 int 879 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 880 { 881 struct ifbrparam *param = arg; 882 883 sc->sc_bridge_priority = param->ifbrp_prio; 884 885 if (sc->sc_if.if_flags & IFF_RUNNING) 886 bstp_initialization(sc); 887 888 return (0); 889 } 890 891 int 892 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 893 { 894 struct ifbrparam *param = arg; 895 896 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 897 898 return (0); 899 } 900 901 int 902 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 903 { 904 struct ifbrparam *param = arg; 905 906 if (param->ifbrp_hellotime == 0) 907 return (EINVAL); 908 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 909 910 if (sc->sc_if.if_flags & IFF_RUNNING) 911 bstp_initialization(sc); 912 913 return (0); 914 } 915 916 int 917 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 918 { 919 struct ifbrparam *param = arg; 920 921 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 922 923 return (0); 924 } 925 926 int 927 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 928 { 929 struct ifbrparam *param = arg; 930 931 if (param->ifbrp_fwddelay == 0) 932 return (EINVAL); 933 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 934 935 if (sc->sc_if.if_flags & IFF_RUNNING) 936 bstp_initialization(sc); 937 938 return (0); 939 } 940 941 int 942 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 943 { 944 struct ifbrparam *param = arg; 945 946 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 947 948 return (0); 949 } 950 951 int 952 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 953 { 954 struct ifbrparam *param = arg; 955 956 if (param->ifbrp_maxage == 0) 957 return (EINVAL); 958 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 959 960 if (sc->sc_if.if_flags & IFF_RUNNING) 961 bstp_initialization(sc); 962 963 return (0); 964 } 965 966 int 967 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 968 { 969 struct ifbreq *req = arg; 970 struct bridge_iflist *bif; 971 972 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 973 if (bif == NULL) 974 return (ENOENT); 975 976 bif->bif_priority = req->ifbr_priority; 977 978 if (sc->sc_if.if_flags & IFF_RUNNING) 979 bstp_initialization(sc); 980 981 return (0); 982 } 983 984 #ifdef BRIDGE_IPF 985 int 986 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 987 { 988 struct ifbrparam *param = arg; 989 990 param->ifbrp_filter = sc->sc_filter_flags; 991 992 return (0); 993 } 994 995 int 996 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 997 { 998 struct ifbrparam *param = arg; 999 uint32_t nflags, oflags; 1000 1001 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1002 return (EINVAL); 1003 1004 nflags = param->ifbrp_filter; 1005 oflags = sc->sc_filter_flags; 1006 1007 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1008 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1009 &sc->sc_if.if_pfil); 1010 } 1011 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1012 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1013 &sc->sc_if.if_pfil); 1014 } 1015 1016 sc->sc_filter_flags = nflags; 1017 1018 return (0); 1019 } 1020 #endif /* BRIDGE_IPF */ 1021 1022 /* 1023 * bridge_ifdetach: 1024 * 1025 * Detach an interface from a bridge. Called when a member 1026 * interface is detaching. 1027 */ 1028 void 1029 bridge_ifdetach(struct ifnet *ifp) 1030 { 1031 struct bridge_softc *sc = ifp->if_bridge; 1032 struct ifbreq breq; 1033 1034 memset(&breq, 0, sizeof(breq)); 1035 sprintf(breq.ifbr_ifsname, ifp->if_xname); 1036 1037 (void) bridge_ioctl_del(sc, &breq); 1038 } 1039 1040 /* 1041 * bridge_init: 1042 * 1043 * Initialize a bridge interface. 1044 */ 1045 int 1046 bridge_init(struct ifnet *ifp) 1047 { 1048 struct bridge_softc *sc = ifp->if_softc; 1049 1050 if (ifp->if_flags & IFF_RUNNING) 1051 return (0); 1052 1053 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1054 bridge_timer, sc); 1055 1056 ifp->if_flags |= IFF_RUNNING; 1057 return (0); 1058 } 1059 1060 /* 1061 * bridge_stop: 1062 * 1063 * Stop the bridge interface. 1064 */ 1065 void 1066 bridge_stop(struct ifnet *ifp, int disable) 1067 { 1068 struct bridge_softc *sc = ifp->if_softc; 1069 1070 if ((ifp->if_flags & IFF_RUNNING) == 0) 1071 return; 1072 1073 callout_stop(&sc->sc_brcallout); 1074 bstp_stop(sc); 1075 1076 IF_PURGE(&ifp->if_snd); 1077 1078 bridge_rtflush(sc, IFBF_FLUSHDYN); 1079 1080 ifp->if_flags &= ~IFF_RUNNING; 1081 } 1082 1083 /* 1084 * bridge_enqueue: 1085 * 1086 * Enqueue a packet on a bridge member interface. 1087 * 1088 * NOTE: must be called at splnet(). 1089 */ 1090 __inline void 1091 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1092 { 1093 ALTQ_DECL(struct altq_pktattr pktattr;) 1094 int len, error; 1095 short mflags; 1096 1097 #ifdef PFIL_HOOKS 1098 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, dst_ifp, PFIL_OUT) != 0) { 1099 m_freem(m); 1100 return; 1101 } 1102 if (m == NULL) 1103 return; 1104 #endif /* PFIL_HOOKS */ 1105 1106 #ifdef ALTQ 1107 /* 1108 * If ALTQ is enabled on the member interface, do 1109 * classification; the queueing discipline might 1110 * not require classification, but might require 1111 * the address family/header pointer in the pktattr. 1112 */ 1113 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1114 /* XXX IFT_ETHER */ 1115 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1116 } 1117 #endif /* ALTQ */ 1118 1119 len = m->m_pkthdr.len; 1120 mflags = m->m_flags; 1121 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1122 if (error) { 1123 /* mbuf is already freed */ 1124 sc->sc_if.if_oerrors++; 1125 return; 1126 } 1127 1128 sc->sc_if.if_opackets++; 1129 sc->sc_if.if_obytes += len; 1130 1131 dst_ifp->if_obytes += len; 1132 1133 if (mflags & M_MCAST) { 1134 sc->sc_if.if_omcasts++; 1135 dst_ifp->if_omcasts++; 1136 } 1137 1138 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1139 (*dst_ifp->if_start)(dst_ifp); 1140 } 1141 1142 /* 1143 * bridge_output: 1144 * 1145 * Send output from a bridge member interface. This 1146 * performs the bridging function for locally originated 1147 * packets. 1148 * 1149 * The mbuf has the Ethernet header already attached. We must 1150 * enqueue or free the mbuf before returning. 1151 */ 1152 int 1153 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1154 struct rtentry *rt) 1155 { 1156 struct ether_header *eh; 1157 struct ifnet *dst_if; 1158 struct bridge_softc *sc; 1159 int s; 1160 1161 if (m->m_len < ETHER_HDR_LEN) { 1162 m = m_pullup(m, ETHER_HDR_LEN); 1163 if (m == NULL) 1164 return (0); 1165 } 1166 1167 eh = mtod(m, struct ether_header *); 1168 sc = ifp->if_bridge; 1169 1170 s = splnet(); 1171 1172 /* 1173 * If bridge is down, but the original output interface is up, 1174 * go ahead and send out that interface. Otherwise, the packet 1175 * is dropped below. 1176 */ 1177 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1178 dst_if = ifp; 1179 goto sendunicast; 1180 } 1181 1182 /* 1183 * If the packet is a multicast, or we don't know a better way to 1184 * get there, send to all interfaces. 1185 */ 1186 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1187 dst_if = NULL; 1188 else 1189 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1190 if (dst_if == NULL) { 1191 struct bridge_iflist *bif; 1192 struct mbuf *mc; 1193 int used = 0; 1194 1195 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1196 dst_if = bif->bif_ifp; 1197 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1198 continue; 1199 1200 /* 1201 * If this is not the original output interface, 1202 * and the interface is participating in spanning 1203 * tree, make sure the port is in a state that 1204 * allows forwarding. 1205 */ 1206 if (dst_if != ifp && 1207 (bif->bif_flags & IFBIF_STP) != 0) { 1208 switch (bif->bif_state) { 1209 case BSTP_IFSTATE_BLOCKING: 1210 case BSTP_IFSTATE_LISTENING: 1211 case BSTP_IFSTATE_DISABLED: 1212 continue; 1213 } 1214 } 1215 1216 if (LIST_NEXT(bif, bif_next) == NULL) { 1217 used = 1; 1218 mc = m; 1219 } else { 1220 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1221 if (mc == NULL) { 1222 sc->sc_if.if_oerrors++; 1223 continue; 1224 } 1225 } 1226 1227 bridge_enqueue(sc, dst_if, mc); 1228 } 1229 if (used == 0) 1230 m_freem(m); 1231 splx(s); 1232 return (0); 1233 } 1234 1235 sendunicast: 1236 /* 1237 * XXX Spanning tree consideration here? 1238 */ 1239 1240 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1241 m_freem(m); 1242 splx(s); 1243 return (0); 1244 } 1245 1246 bridge_enqueue(sc, dst_if, m); 1247 1248 splx(s); 1249 return (0); 1250 } 1251 1252 /* 1253 * bridge_start: 1254 * 1255 * Start output on a bridge. 1256 * 1257 * NOTE: This routine should never be called in this implementation. 1258 */ 1259 void 1260 bridge_start(struct ifnet *ifp) 1261 { 1262 1263 printf("%s: bridge_start() called\n", ifp->if_xname); 1264 } 1265 1266 /* 1267 * bridge_forward: 1268 * 1269 * The fowarding function of the bridge. 1270 */ 1271 void 1272 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1273 { 1274 struct bridge_iflist *bif; 1275 struct ifnet *src_if, *dst_if; 1276 struct ether_header *eh; 1277 1278 src_if = m->m_pkthdr.rcvif; 1279 1280 sc->sc_if.if_ipackets++; 1281 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1282 1283 /* 1284 * Look up the bridge_iflist. 1285 */ 1286 bif = bridge_lookup_member_if(sc, src_if); 1287 if (bif == NULL) { 1288 /* Interface is not a bridge member (anymore?) */ 1289 m_freem(m); 1290 return; 1291 } 1292 1293 if (bif->bif_flags & IFBIF_STP) { 1294 switch (bif->bif_state) { 1295 case BSTP_IFSTATE_BLOCKING: 1296 case BSTP_IFSTATE_LISTENING: 1297 case BSTP_IFSTATE_DISABLED: 1298 m_freem(m); 1299 return; 1300 } 1301 } 1302 1303 eh = mtod(m, struct ether_header *); 1304 1305 /* 1306 * If the interface is learning, and the source 1307 * address is valid and not multicast, record 1308 * the address. 1309 */ 1310 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1311 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1312 (eh->ether_shost[0] == 0 && 1313 eh->ether_shost[1] == 0 && 1314 eh->ether_shost[2] == 0 && 1315 eh->ether_shost[3] == 0 && 1316 eh->ether_shost[4] == 0 && 1317 eh->ether_shost[5] == 0) == 0) { 1318 (void) bridge_rtupdate(sc, eh->ether_shost, 1319 src_if, 0, IFBAF_DYNAMIC); 1320 } 1321 1322 if ((bif->bif_flags & IFBIF_STP) != 0 && 1323 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1324 m_freem(m); 1325 return; 1326 } 1327 1328 /* 1329 * At this point, the port either doesn't participate 1330 * in spanning tree or it is in the forwarding state. 1331 */ 1332 1333 /* 1334 * If the packet is unicast, destined for someone on 1335 * "this" side of the bridge, drop it. 1336 */ 1337 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1338 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1339 if (src_if == dst_if) { 1340 m_freem(m); 1341 return; 1342 } 1343 } else { 1344 /* ...forward it to all interfaces. */ 1345 sc->sc_if.if_imcasts++; 1346 dst_if = NULL; 1347 } 1348 1349 #ifdef PFIL_HOOKS 1350 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1351 m_freem(m); 1352 return; 1353 } 1354 if (m == NULL) 1355 return; 1356 #endif /* PFIL_HOOKS */ 1357 1358 if (dst_if == NULL) { 1359 bridge_broadcast(sc, src_if, m); 1360 return; 1361 } 1362 1363 /* 1364 * At this point, we're dealing with a unicast frame 1365 * going to a different interface. 1366 */ 1367 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1368 m_freem(m); 1369 return; 1370 } 1371 bif = bridge_lookup_member_if(sc, dst_if); 1372 if (bif == NULL) { 1373 /* Not a member of the bridge (anymore?) */ 1374 m_freem(m); 1375 return; 1376 } 1377 1378 if (bif->bif_flags & IFBIF_STP) { 1379 switch (bif->bif_state) { 1380 case BSTP_IFSTATE_DISABLED: 1381 case BSTP_IFSTATE_BLOCKING: 1382 m_freem(m); 1383 return; 1384 } 1385 } 1386 1387 bridge_enqueue(sc, dst_if, m); 1388 } 1389 1390 /* 1391 * bridge_input: 1392 * 1393 * Receive input from a member interface. Queue the packet for 1394 * bridging if it is not for us. 1395 */ 1396 struct mbuf * 1397 bridge_input(struct ifnet *ifp, struct mbuf *m) 1398 { 1399 struct bridge_softc *sc = ifp->if_bridge; 1400 struct bridge_iflist *bif; 1401 struct ether_header *eh; 1402 struct mbuf *mc; 1403 1404 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1405 return (m); 1406 1407 bif = bridge_lookup_member_if(sc, ifp); 1408 if (bif == NULL) 1409 return (m); 1410 1411 eh = mtod(m, struct ether_header *); 1412 1413 if (m->m_flags & (M_BCAST|M_MCAST)) { 1414 /* Tap off 802.1D packets; they do not get forwarded. */ 1415 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1416 ETHER_ADDR_LEN) == 0) { 1417 m = bstp_input(ifp, m); 1418 if (m == NULL) 1419 return (NULL); 1420 } 1421 1422 if (bif->bif_flags & IFBIF_STP) { 1423 switch (bif->bif_state) { 1424 case BSTP_IFSTATE_BLOCKING: 1425 case BSTP_IFSTATE_LISTENING: 1426 case BSTP_IFSTATE_DISABLED: 1427 return (m); 1428 } 1429 } 1430 1431 /* 1432 * Make a deep copy of the packet and enqueue the copy 1433 * for bridge processing; return the original packet for 1434 * local processing. 1435 */ 1436 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1437 if (mc == NULL) 1438 return (m); 1439 1440 /* Perform the bridge forwarding function with the copy. */ 1441 bridge_forward(sc, mc); 1442 1443 /* Return the original packet for local processing. */ 1444 return (m); 1445 } 1446 1447 if (bif->bif_flags & IFBIF_STP) { 1448 switch (bif->bif_state) { 1449 case BSTP_IFSTATE_BLOCKING: 1450 case BSTP_IFSTATE_LISTENING: 1451 case BSTP_IFSTATE_DISABLED: 1452 return (m); 1453 } 1454 } 1455 1456 /* 1457 * Unicast. Make sure it's not for us. 1458 */ 1459 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1460 /* It is destined for us. */ 1461 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1462 ETHER_ADDR_LEN) == 0) { 1463 if (bif->bif_flags & IFBIF_LEARNING) 1464 (void) bridge_rtupdate(sc, 1465 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1466 m->m_pkthdr.rcvif = bif->bif_ifp; 1467 return (m); 1468 } 1469 1470 /* We just received a packet that we sent out. */ 1471 if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1472 ETHER_ADDR_LEN) == 0) { 1473 m_freem(m); 1474 return (NULL); 1475 } 1476 } 1477 1478 /* Perform the bridge forwarding function. */ 1479 bridge_forward(sc, m); 1480 1481 return (NULL); 1482 } 1483 1484 /* 1485 * bridge_broadcast: 1486 * 1487 * Send a frame to all interfaces that are members of 1488 * the bridge, except for the one on which the packet 1489 * arrived. 1490 */ 1491 void 1492 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1493 struct mbuf *m) 1494 { 1495 struct bridge_iflist *bif; 1496 struct mbuf *mc; 1497 struct ifnet *dst_if; 1498 int used = 0; 1499 1500 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1501 dst_if = bif->bif_ifp; 1502 if (dst_if == src_if) 1503 continue; 1504 1505 if (bif->bif_flags & IFBIF_STP) { 1506 switch (bif->bif_state) { 1507 case BSTP_IFSTATE_BLOCKING: 1508 case BSTP_IFSTATE_DISABLED: 1509 continue; 1510 } 1511 } 1512 1513 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1514 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1515 continue; 1516 1517 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1518 continue; 1519 1520 if (LIST_NEXT(bif, bif_next) == NULL) { 1521 mc = m; 1522 used = 1; 1523 } else { 1524 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1525 if (mc == NULL) { 1526 sc->sc_if.if_oerrors++; 1527 continue; 1528 } 1529 } 1530 1531 bridge_enqueue(sc, dst_if, mc); 1532 } 1533 if (used == 0) 1534 m_freem(m); 1535 } 1536 1537 /* 1538 * bridge_rtupdate: 1539 * 1540 * Add a bridge routing entry. 1541 */ 1542 int 1543 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1544 struct ifnet *dst_if, int setflags, uint8_t flags) 1545 { 1546 struct bridge_rtnode *brt; 1547 int error; 1548 1549 /* 1550 * A route for this destination might already exist. If so, 1551 * update it, otherwise create a new one. 1552 */ 1553 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1554 if (sc->sc_brtcnt >= sc->sc_brtmax) 1555 return (ENOSPC); 1556 1557 /* 1558 * Allocate a new bridge forwarding node, and 1559 * initialize the expiration time and Ethernet 1560 * address. 1561 */ 1562 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1563 if (brt == NULL) 1564 return (ENOMEM); 1565 1566 memset(brt, 0, sizeof(*brt)); 1567 brt->brt_expire = mono_time.tv_sec + sc->sc_brttimeout; 1568 brt->brt_flags = IFBAF_DYNAMIC; 1569 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1570 1571 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1572 pool_put(&bridge_rtnode_pool, brt); 1573 return (error); 1574 } 1575 } 1576 1577 brt->brt_ifp = dst_if; 1578 if (setflags) { 1579 brt->brt_flags = flags; 1580 brt->brt_expire = (flags & IFBAF_STATIC) ? 0 : 1581 mono_time.tv_sec + sc->sc_brttimeout; 1582 } 1583 1584 return (0); 1585 } 1586 1587 /* 1588 * bridge_rtlookup: 1589 * 1590 * Lookup the destination interface for an address. 1591 */ 1592 struct ifnet * 1593 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1594 { 1595 struct bridge_rtnode *brt; 1596 1597 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1598 return (NULL); 1599 1600 return (brt->brt_ifp); 1601 } 1602 1603 /* 1604 * bridge_rttrim: 1605 * 1606 * Trim the routine table so that we have a number 1607 * of routing entries less than or equal to the 1608 * maximum number. 1609 */ 1610 void 1611 bridge_rttrim(struct bridge_softc *sc) 1612 { 1613 struct bridge_rtnode *brt, *nbrt; 1614 1615 /* Make sure we actually need to do this. */ 1616 if (sc->sc_brtcnt <= sc->sc_brtmax) 1617 return; 1618 1619 /* Force an aging cycle; this might trim enough addresses. */ 1620 bridge_rtage(sc); 1621 if (sc->sc_brtcnt <= sc->sc_brtmax) 1622 return; 1623 1624 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1625 nbrt = LIST_NEXT(brt, brt_list); 1626 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1627 bridge_rtnode_destroy(sc, brt); 1628 if (sc->sc_brtcnt <= sc->sc_brtmax) 1629 return; 1630 } 1631 } 1632 } 1633 1634 /* 1635 * bridge_timer: 1636 * 1637 * Aging timer for the bridge. 1638 */ 1639 void 1640 bridge_timer(void *arg) 1641 { 1642 struct bridge_softc *sc = arg; 1643 int s; 1644 1645 s = splnet(); 1646 bridge_rtage(sc); 1647 splx(s); 1648 1649 if (sc->sc_if.if_flags & IFF_RUNNING) 1650 callout_reset(&sc->sc_brcallout, 1651 bridge_rtable_prune_period * hz, bridge_timer, sc); 1652 } 1653 1654 /* 1655 * bridge_rtage: 1656 * 1657 * Perform an aging cycle. 1658 */ 1659 void 1660 bridge_rtage(struct bridge_softc *sc) 1661 { 1662 struct bridge_rtnode *brt, *nbrt; 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 if (mono_time.tv_sec >= brt->brt_expire) 1668 bridge_rtnode_destroy(sc, brt); 1669 } 1670 } 1671 } 1672 1673 /* 1674 * bridge_rtflush: 1675 * 1676 * Remove all dynamic addresses from the bridge. 1677 */ 1678 void 1679 bridge_rtflush(struct bridge_softc *sc, int full) 1680 { 1681 struct bridge_rtnode *brt, *nbrt; 1682 1683 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1684 nbrt = LIST_NEXT(brt, brt_list); 1685 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1686 bridge_rtnode_destroy(sc, brt); 1687 } 1688 } 1689 1690 /* 1691 * bridge_rtdaddr: 1692 * 1693 * Remove an address from the table. 1694 */ 1695 int 1696 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1697 { 1698 struct bridge_rtnode *brt; 1699 1700 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1701 return (ENOENT); 1702 1703 bridge_rtnode_destroy(sc, brt); 1704 return (0); 1705 } 1706 1707 /* 1708 * bridge_rtdelete: 1709 * 1710 * Delete routes to a speicifc member interface. 1711 */ 1712 void 1713 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1714 { 1715 struct bridge_rtnode *brt, *nbrt; 1716 1717 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1718 nbrt = LIST_NEXT(brt, brt_list); 1719 if (brt->brt_ifp == ifp) 1720 bridge_rtnode_destroy(sc, brt); 1721 } 1722 } 1723 1724 /* 1725 * bridge_rtable_init: 1726 * 1727 * Initialize the route table for this bridge. 1728 */ 1729 int 1730 bridge_rtable_init(struct bridge_softc *sc) 1731 { 1732 int i; 1733 1734 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1735 M_DEVBUF, M_NOWAIT); 1736 if (sc->sc_rthash == NULL) 1737 return (ENOMEM); 1738 1739 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1740 LIST_INIT(&sc->sc_rthash[i]); 1741 1742 #if NRND > 0 1743 rnd_extract_data(&sc->sc_rthash_key, sizeof(sc->sc_rthash_key), 1744 RND_EXTRACT_ANY); 1745 #else 1746 sc->sc_rthash_key = random(); 1747 #endif /* NRND > 0 */ 1748 1749 LIST_INIT(&sc->sc_rtlist); 1750 1751 return (0); 1752 } 1753 1754 /* 1755 * bridge_rtable_fini: 1756 * 1757 * Deconstruct the route table for this bridge. 1758 */ 1759 void 1760 bridge_rtable_fini(struct bridge_softc *sc) 1761 { 1762 1763 free(sc->sc_rthash, M_DEVBUF); 1764 } 1765 1766 /* 1767 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1768 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1769 */ 1770 #define mix(a, b, c) \ 1771 do { \ 1772 a -= b; a -= c; a ^= (c >> 13); \ 1773 b -= c; b -= a; b ^= (a << 8); \ 1774 c -= a; c -= b; c ^= (b >> 13); \ 1775 a -= b; a -= c; a ^= (c >> 12); \ 1776 b -= c; b -= a; b ^= (a << 16); \ 1777 c -= a; c -= b; c ^= (b >> 5); \ 1778 a -= b; a -= c; a ^= (c >> 3); \ 1779 b -= c; b -= a; b ^= (a << 10); \ 1780 c -= a; c -= b; c ^= (b >> 15); \ 1781 } while (/*CONSTCOND*/0) 1782 1783 static __inline uint32_t 1784 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1785 { 1786 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1787 1788 b += addr[5] << 8; 1789 b += addr[4]; 1790 a += addr[3] << 24; 1791 a += addr[2] << 16; 1792 a += addr[1] << 8; 1793 a += addr[0]; 1794 1795 mix(a, b, c); 1796 1797 return (c & BRIDGE_RTHASH_MASK); 1798 } 1799 1800 #undef mix 1801 1802 /* 1803 * bridge_rtnode_lookup: 1804 * 1805 * Look up a bridge route node for the specified destination. 1806 */ 1807 struct bridge_rtnode * 1808 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1809 { 1810 struct bridge_rtnode *brt; 1811 uint32_t hash; 1812 int dir; 1813 1814 hash = bridge_rthash(sc, addr); 1815 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1816 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1817 if (dir == 0) 1818 return (brt); 1819 if (dir > 0) 1820 return (NULL); 1821 } 1822 1823 return (NULL); 1824 } 1825 1826 /* 1827 * bridge_rtnode_insert: 1828 * 1829 * Insert the specified bridge node into the route table. We 1830 * assume the entry is not already in the table. 1831 */ 1832 int 1833 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1834 { 1835 struct bridge_rtnode *lbrt; 1836 uint32_t hash; 1837 int dir; 1838 1839 hash = bridge_rthash(sc, brt->brt_addr); 1840 1841 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1842 if (lbrt == NULL) { 1843 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1844 goto out; 1845 } 1846 1847 do { 1848 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1849 if (dir == 0) 1850 return (EEXIST); 1851 if (dir > 0) { 1852 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1853 goto out; 1854 } 1855 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1856 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1857 goto out; 1858 } 1859 lbrt = LIST_NEXT(lbrt, brt_hash); 1860 } while (lbrt != NULL); 1861 1862 #ifdef DIAGNOSTIC 1863 panic("bridge_rtnode_insert: impossible"); 1864 #endif 1865 1866 out: 1867 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1868 sc->sc_brtcnt++; 1869 1870 return (0); 1871 } 1872 1873 /* 1874 * bridge_rtnode_destroy: 1875 * 1876 * Destroy a bridge rtnode. 1877 */ 1878 void 1879 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1880 { 1881 1882 LIST_REMOVE(brt, brt_hash); 1883 1884 LIST_REMOVE(brt, brt_list); 1885 sc->sc_brtcnt--; 1886 pool_put(&bridge_rtnode_pool, brt); 1887 } 1888 1889 #ifdef BRIDGE_IPF 1890 extern struct pfil_head inet_pfil_hook; /* XXX */ 1891 extern struct pfil_head inet6_pfil_hook; /* XXX */ 1892 1893 /* 1894 * Send bridge packets through IPF if they are one of the types IPF can deal 1895 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 1896 * question.) 1897 */ 1898 static int bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 1899 { 1900 int snap, error; 1901 struct ether_header *eh; 1902 struct mbuf *m1, *m2; 1903 u_int16_t ether_type; 1904 1905 snap = 0; 1906 error = -1; /* Default error if not error == 0 */ 1907 eh = mtod(*mp, struct ether_header *); 1908 ether_type = ntohs(eh->ether_type); 1909 1910 /* 1911 * Check for SNAP/LLC. 1912 */ 1913 if (ether_type < ETHERMTU) { 1914 struct llc *llc = (struct llc *)(eh + 1); 1915 1916 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 1917 llc->llc_dsap == LLC_SNAP_LSAP && 1918 llc->llc_ssap == LLC_SNAP_LSAP && 1919 llc->llc_control == LLC_UI) { 1920 ether_type = htons(llc->llc_un.type_snap.ether_type); 1921 snap = 1; 1922 } 1923 } 1924 1925 /* 1926 * If we're trying to filter bridge traffic, don't look at anything 1927 * other than IP and ARP traffic. If the filter doesn't understand 1928 * IPv6, don't allow IPv6 through the bridge either. This is lame 1929 * since if we really wanted, say, an AppleTalk filter, we are hosed, 1930 * but of course we don't have an AppleTalk filter to begin with. 1931 * (Note that since IPF doesn't understand ARP it will pass *ALL* 1932 * ARP traffic.) 1933 */ 1934 switch (ether_type) { 1935 case ETHERTYPE_ARP: 1936 case ETHERTYPE_REVARP: 1937 return 0; /* Automatically pass */ 1938 case ETHERTYPE_IP: 1939 # ifdef INET6 1940 case ETHERTYPE_IPV6: 1941 # endif /* INET6 */ 1942 break; 1943 default: 1944 goto bad; 1945 } 1946 1947 /* Strip off the Ethernet header---but keep a copy. */ 1948 if ((m1 = m_split(*mp, sizeof(struct ether_header), M_NOWAIT)) == NULL) 1949 goto bad; 1950 /* Strip off snap header, if present */ 1951 if (snap) { 1952 if ((m2 = m_split(m1, sizeof(struct llc), M_NOWAIT)) == NULL) 1953 goto bad2; 1954 } else 1955 m2 = m1; 1956 1957 /* 1958 * Check basic packet sanity, if the packet is outbound, and 1959 * run IPF filter. 1960 */ 1961 if (ether_type == ETHERTYPE_IP && 1962 (dir == PFIL_OUT || bridge_ip_checkbasic(&m2) == 0)) { 1963 error = pfil_run_hooks(&inet_pfil_hook, &m2, ifp, dir); 1964 if (error) goto bad2; 1965 } 1966 # ifdef INET6 1967 if (ether_type == ETHERTYPE_IPV6 && 1968 (dir == PFIL_OUT || bridge_ip6_checkbasic(&m2) == 0)) { 1969 error = pfil_run_hooks(&inet6_pfil_hook, &m2, ifp, dir); 1970 if (error) goto bad2; 1971 } 1972 # endif 1973 if (m2 == NULL) goto bad2; 1974 1975 /* 1976 * Finally, put everything back the way it was and return 1977 */ 1978 if (snap) 1979 m_cat(m1, m2); 1980 else 1981 m1 = m2; 1982 m_cat(*mp, m1); 1983 return 0; 1984 1985 1986 bad2: 1987 if (snap) 1988 m_freem(m1); 1989 m_freem(m2); 1990 bad: 1991 m_freem(*mp); 1992 *mp = NULL; 1993 return error; 1994 } 1995 1996 /* 1997 * Perform basic checks on header size since 1998 * IPF assumes ip_input has already processed 1999 * it for it. Cut-and-pasted from ip_input.c. 2000 * Given how simple the IPv6 version is, 2001 * does the IPv4 version really need to be 2002 * this complicated? 2003 * 2004 * XXX Should we update ipstat here, or not? 2005 * XXX Right now we update ipstat but not 2006 * XXX csum_counter. 2007 */ 2008 static int 2009 bridge_ip_checkbasic(struct mbuf **mp) 2010 { 2011 struct mbuf *m = *mp; 2012 struct ip *ip; 2013 int len, hlen; 2014 2015 if (*mp == NULL) 2016 return -1; 2017 2018 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2019 if ((m = m_copyup(m, sizeof(struct ip), 2020 (max_linkhdr + 3) & ~3)) == NULL) { 2021 /* XXXJRT new stat, please */ 2022 ipstat.ips_toosmall++; 2023 goto bad; 2024 } 2025 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2026 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2027 ipstat.ips_toosmall++; 2028 goto bad; 2029 } 2030 } 2031 ip = mtod(m, struct ip *); 2032 if (ip == NULL) goto bad; 2033 2034 if (ip->ip_v != IPVERSION) { 2035 ipstat.ips_badvers++; 2036 goto bad; 2037 } 2038 hlen = ip->ip_hl << 2; 2039 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2040 ipstat.ips_badhlen++; 2041 goto bad; 2042 } 2043 if (hlen > m->m_len) { 2044 if ((m = m_pullup(m, hlen)) == 0) { 2045 ipstat.ips_badhlen++; 2046 goto bad; 2047 } 2048 ip = mtod(m, struct ip *); 2049 if (ip == NULL) goto bad; 2050 } 2051 2052 switch (m->m_pkthdr.csum_flags & 2053 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2054 M_CSUM_IPv4_BAD)) { 2055 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2056 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2057 goto bad; 2058 2059 case M_CSUM_IPv4: 2060 /* Checksum was okay. */ 2061 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2062 break; 2063 2064 default: 2065 /* Must compute it ourselves. */ 2066 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2067 if (in_cksum(m, hlen) != 0) 2068 goto bad; 2069 break; 2070 } 2071 2072 /* Retrieve the packet length. */ 2073 len = ntohs(ip->ip_len); 2074 2075 /* 2076 * Check for additional length bogosity 2077 */ 2078 if (len < hlen) { 2079 ipstat.ips_badlen++; 2080 goto bad; 2081 } 2082 2083 /* 2084 * Check that the amount of data in the buffers 2085 * is as at least much as the IP header would have us expect. 2086 * Drop packet if shorter than we expect. 2087 */ 2088 if (m->m_pkthdr.len < len) { 2089 ipstat.ips_tooshort++; 2090 goto bad; 2091 } 2092 2093 /* Checks out, proceed */ 2094 *mp = m; 2095 return 0; 2096 2097 bad: 2098 *mp = m; 2099 return -1; 2100 } 2101 2102 # ifdef INET6 2103 /* 2104 * Same as above, but for IPv6. 2105 * Cut-and-pasted from ip6_input.c. 2106 * XXX Should we update ip6stat, or not? 2107 */ 2108 static int 2109 bridge_ip6_checkbasic(struct mbuf **mp) 2110 { 2111 struct mbuf *m = *mp; 2112 struct ip6 *ip6; 2113 2114 /* 2115 * If the IPv6 header is not aligned, slurp it up into a new 2116 * mbuf with space for link headers, in the event we forward 2117 * it. Otherwise, if it is aligned, make sure the entire base 2118 * IPv6 header is in the first mbuf of the chain. 2119 */ 2120 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2121 struct ifnet *inifp = m->m_pkthdr.rcvif; 2122 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2123 (max_linkhdr + 3) & ~3)) == NULL) { 2124 /* XXXJRT new stat, please */ 2125 ip6stat.ip6s_toosmall++; 2126 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2127 goto bad; 2128 } 2129 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2130 struct ifnet *inifp = m->m_pkthdr.rcvif; 2131 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2132 ip6stat.ip6s_toosmall++; 2133 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2134 goto bad; 2135 } 2136 } 2137 2138 ip6 = mtod(m, struct ip6_hdr *); 2139 2140 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2141 ip6stat.ip6s_badvers++; 2142 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2143 goto bad; 2144 } 2145 2146 /* Checks out, proceed */ 2147 *mp = m; 2148 return 0; 2149 2150 bad: 2151 *mp = m; 2152 return -1; 2153 } 2154 # endif /* INET6 */ 2155 #endif /* BRIDGE_IPF */ 2156
Indexes created Mon Sep 22 21:09:42 GMT 2025