2 * Copyright 2001 Wasabi Systems, Inc.
5 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed for the NetBSD Project by
18 * Wasabi Systems, Inc.
19 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
20 * or promote products derived from this software without specific prior
23 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
37 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
38 * All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by Jason L. Wright
51 * 4. The name of the author may not be used to endorse or promote products
52 * derived from this software without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
55 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
56 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
57 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
58 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
59 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
60 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
62 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
63 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
64 * POSSIBILITY OF SUCH DAMAGE.
66 * $OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp $
67 * $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $
68 * $FreeBSD: src/sys/net/if_bridge.c,v 1.26 2005/10/13 23:05:55 thompsa Exp $
72 * Network interface bridge support.
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).
82 * Bridge's route information is duplicated to each CPUs:
85 * +-----------+ +-----------+ +-----------+ +-----------+
86 * | rtnode | | rtnode | | rtnode | | rtnode |
88 * | dst eaddr | | dst eaddr | | dst eaddr | | dst eaddr |
89 * +-----------+ +-----------+ +-----------+ +-----------+
92 * | | +----------+ | |
96 * +-------------->| timeout |<-------------+
100 * We choose to put timeout and dst_ifp into shared part, so updating
101 * them will be cheaper than using message forwarding. Also there is
102 * not need to use spinlock to protect the updating: timeout and dst_ifp
103 * is not related and specific field's updating order has no importance.
104 * The cache pollution by the share part should not be heavy: in a stable
105 * setup, dst_ifp probably will be not changed in rtnode's life time,
106 * while timeout is refreshed once per second; most of the time, timeout
107 * and dst_ifp are read-only accessed.
110 * Bridge route information installation on bridge_input path:
112 * CPU0 CPU1 CPU2 CPU3
119 * ifnet0<-----------------------+
122 * rtnode exists?(Y)free nmsg :
153 * The netmsgs forwarded between protocol threads and ifnet threads are
154 * allocated with (M_WAITOK|M_NULLOK), so it will not fail under most
155 * cases (route information is too precious to be not installed :).
156 * Since multiple threads may try to install route information for the
157 * same dst eaddr, we look up route information in ifnet0. However, this
158 * looking up only need to be performed on ifnet0, which is the start
159 * point of the route information installation process.
162 * Bridge route information deleting/flushing:
164 * CPU0 CPU1 CPU2 CPU3
168 * find suitable rtnodes,
169 * mark their rtinfo dead
171 * | domsg <------------------------------------------+
174 * V fwdmsg fwdmsg fwdmsg |
175 * ifnet0 --------> ifnet1 --------> ifnet2 --------> ifnet3
176 * delete rtnodes delete rtnodes delete rtnodes delete rtnodes
177 * w/ dead rtinfo w/ dead rtinfo w/ dead rtinfo w/ dead rtinfo
180 * All deleting/flushing operations are serialized by netisr0, so each
181 * operation only reaps the route information marked dead by itself.
184 * Bridge route information adding/deleting/flushing:
185 * Since all operation is serialized by the fixed message flow between
186 * ifnet threads, it is not possible to create corrupted per-cpu route
191 * Percpu member interface list iteration with blocking operation:
192 * Since one bridge could only delete one member interface at a time and
193 * the deleted member interface is not freed after netmsg_service_sync(),
194 * following way is used to make sure that even if the certain member
195 * interface is ripped from the percpu list during the blocking operation,
196 * the iteration still could keep going:
198 * TAILQ_FOREACH_MUTABLE(bif, sc->sc_iflists[mycpuid], bif_next, nbif) {
199 * blocking operation;
200 * blocking operation;
203 * if (nbif != NULL && !nbif->bif_onlist) {
204 * KKASSERT(bif->bif_onlist);
205 * nbif = TAILQ_NEXT(bif, bif_next);
209 * As mentioned above only one member interface could be unlinked from the
210 * percpu member interface list, so either bif or nbif may be not on the list,
211 * but _not_ both. To keep the list iteration, we don't care about bif, but
212 * only nbif. Since removed member interface will only be freed after we
213 * finish our work, it is safe to access any field in an unlinked bif (here
214 * bif_onlist). If nbif is no longer on the list, then bif must be on the
215 * list, so we change nbif to the next element of bif and keep going.
218 #include "opt_inet.h"
219 #include "opt_inet6.h"
221 #include <sys/param.h>
222 #include <sys/mbuf.h>
223 #include <sys/malloc.h>
224 #include <sys/protosw.h>
225 #include <sys/systm.h>
226 #include <sys/time.h>
227 #include <sys/socket.h> /* for net/if.h */
228 #include <sys/sockio.h>
229 #include <sys/ctype.h> /* string functions */
230 #include <sys/kernel.h>
231 #include <sys/random.h>
232 #include <sys/sysctl.h>
233 #include <sys/module.h>
234 #include <sys/proc.h>
235 #include <sys/priv.h>
236 #include <sys/lock.h>
237 #include <sys/thread.h>
238 #include <sys/thread2.h>
239 #include <sys/mpipe.h>
243 #include <net/if_dl.h>
244 #include <net/if_types.h>
245 #include <net/if_var.h>
246 #include <net/pfil.h>
247 #include <net/ifq_var.h>
248 #include <net/if_clone.h>
250 #include <netinet/in.h> /* for struct arpcom */
251 #include <netinet/in_systm.h>
252 #include <netinet/in_var.h>
253 #include <netinet/ip.h>
254 #include <netinet/ip_var.h>
256 #include <netinet/ip6.h>
257 #include <netinet6/ip6_var.h>
259 #include <netinet/if_ether.h> /* for struct arpcom */
260 #include <net/bridge/if_bridgevar.h>
261 #include <net/if_llc.h>
262 #include <net/netmsg2.h>
264 #include <net/route.h>
265 #include <sys/in_cksum.h>
268 * Size of the route hash table. Must be a power of two.
270 #ifndef BRIDGE_RTHASH_SIZE
271 #define BRIDGE_RTHASH_SIZE 1024
274 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
277 * Maximum number of addresses to cache.
279 #ifndef BRIDGE_RTABLE_MAX
280 #define BRIDGE_RTABLE_MAX 100
284 * Spanning tree defaults.
286 #define BSTP_DEFAULT_MAX_AGE (20 * 256)
287 #define BSTP_DEFAULT_HELLO_TIME (2 * 256)
288 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256)
289 #define BSTP_DEFAULT_HOLD_TIME (1 * 256)
290 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000
291 #define BSTP_DEFAULT_PORT_PRIORITY 0x80
292 #define BSTP_DEFAULT_PATH_COST 55
295 * Timeout (in seconds) for entries learned dynamically.
297 #ifndef BRIDGE_RTABLE_TIMEOUT
298 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
302 * Number of seconds between walks of the route list.
304 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
305 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
309 * List of capabilities to mask on the member interface.
311 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM
313 typedef int (*bridge_ctl_t)(struct bridge_softc *, void *);
315 struct netmsg_brctl {
316 struct netmsg_base base;
317 bridge_ctl_t bc_func;
318 struct bridge_softc *bc_sc;
322 struct netmsg_brsaddr {
323 struct netmsg_base base;
324 struct bridge_softc *br_softc;
325 struct ifnet *br_dst_if;
326 struct bridge_rtinfo *br_rtinfo;
328 uint8_t br_dst[ETHER_ADDR_LEN];
332 struct netmsg_braddbif {
333 struct netmsg_base base;
334 struct bridge_softc *br_softc;
335 struct bridge_ifinfo *br_bif_info;
336 struct ifnet *br_bif_ifp;
339 struct netmsg_brdelbif {
340 struct netmsg_base base;
341 struct bridge_softc *br_softc;
342 struct bridge_ifinfo *br_bif_info;
343 struct bridge_iflist_head *br_bif_list;
346 struct netmsg_brsflags {
347 struct netmsg_base base;
348 struct bridge_softc *br_softc;
349 struct bridge_ifinfo *br_bif_info;
350 uint32_t br_bif_flags;
353 eventhandler_tag bridge_detach_cookie = NULL;
355 extern struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
356 extern int (*bridge_output_p)(struct ifnet *, struct mbuf *);
357 extern void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
358 extern struct ifnet *(*bridge_interface_p)(void *if_bridge);
360 static int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
362 static int bridge_clone_create(struct if_clone *, int, caddr_t);
363 static int bridge_clone_destroy(struct ifnet *);
365 static int bridge_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
366 static void bridge_mutecaps(struct bridge_ifinfo *, struct ifnet *, int);
367 static void bridge_ifdetach(void *, struct ifnet *);
368 static void bridge_init(void *);
369 static int bridge_from_us(struct bridge_softc *, struct ether_header *);
370 static void bridge_stop(struct ifnet *);
371 static void bridge_start(struct ifnet *);
372 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
373 static int bridge_output(struct ifnet *, struct mbuf *);
374 static struct ifnet *bridge_interface(void *if_bridge);
376 static void bridge_forward(struct bridge_softc *, struct mbuf *m);
378 static void bridge_timer_handler(netmsg_t);
379 static void bridge_timer(void *);
381 static void bridge_start_bcast(struct bridge_softc *, struct mbuf *);
382 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
384 static void bridge_span(struct bridge_softc *, struct mbuf *);
386 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
387 struct ifnet *, uint8_t);
388 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *);
389 static void bridge_rtreap(struct bridge_softc *);
390 static void bridge_rtreap_async(struct bridge_softc *);
391 static void bridge_rttrim(struct bridge_softc *);
392 static int bridge_rtage_finddead(struct bridge_softc *);
393 static void bridge_rtage(struct bridge_softc *);
394 static void bridge_rtflush(struct bridge_softc *, int);
395 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
396 static int bridge_rtsaddr(struct bridge_softc *, const uint8_t *,
397 struct ifnet *, uint8_t);
398 static void bridge_rtmsg_sync(struct bridge_softc *sc);
399 static void bridge_rtreap_handler(netmsg_t);
400 static void bridge_rtinstall_handler(netmsg_t);
401 static int bridge_rtinstall_oncpu(struct bridge_softc *, const uint8_t *,
402 struct ifnet *, int, uint8_t, struct bridge_rtinfo **);
404 static void bridge_rtable_init(struct bridge_softc *);
405 static void bridge_rtable_fini(struct bridge_softc *);
407 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
408 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
410 static void bridge_rtnode_insert(struct bridge_softc *,
411 struct bridge_rtnode *);
412 static void bridge_rtnode_destroy(struct bridge_softc *,
413 struct bridge_rtnode *);
415 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
417 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
419 static struct bridge_iflist *bridge_lookup_member_ifinfo(struct bridge_softc *,
420 struct bridge_ifinfo *);
421 static void bridge_delete_member(struct bridge_softc *,
422 struct bridge_iflist *, int);
423 static void bridge_delete_span(struct bridge_softc *,
424 struct bridge_iflist *);
426 static int bridge_control(struct bridge_softc *, u_long,
427 bridge_ctl_t, void *);
428 static int bridge_ioctl_init(struct bridge_softc *, void *);
429 static int bridge_ioctl_stop(struct bridge_softc *, void *);
430 static int bridge_ioctl_add(struct bridge_softc *, void *);
431 static int bridge_ioctl_del(struct bridge_softc *, void *);
432 static void bridge_ioctl_fillflags(struct bridge_softc *sc,
433 struct bridge_iflist *bif, struct ifbreq *req);
434 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
435 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
436 static int bridge_ioctl_scache(struct bridge_softc *, void *);
437 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
438 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
439 static int bridge_ioctl_rts(struct bridge_softc *, void *);
440 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
441 static int bridge_ioctl_sto(struct bridge_softc *, void *);
442 static int bridge_ioctl_gto(struct bridge_softc *, void *);
443 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
444 static int bridge_ioctl_flush(struct bridge_softc *, void *);
445 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
446 static int bridge_ioctl_spri(struct bridge_softc *, void *);
447 static int bridge_ioctl_reinit(struct bridge_softc *, void *);
448 static int bridge_ioctl_ght(struct bridge_softc *, void *);
449 static int bridge_ioctl_sht(struct bridge_softc *, void *);
450 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
451 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
452 static int bridge_ioctl_gma(struct bridge_softc *, void *);
453 static int bridge_ioctl_sma(struct bridge_softc *, void *);
454 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
455 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
456 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
457 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
458 static int bridge_ioctl_sifbondwght(struct bridge_softc *, void *);
459 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
461 static int bridge_ip_checkbasic(struct mbuf **mp);
463 static int bridge_ip6_checkbasic(struct mbuf **mp);
465 static int bridge_fragment(struct ifnet *, struct mbuf *,
466 struct ether_header *, int, struct llc *);
467 static void bridge_enqueue_handler(netmsg_t);
468 static void bridge_handoff(struct bridge_softc *, struct ifnet *,
471 static void bridge_del_bif_handler(netmsg_t);
472 static void bridge_add_bif_handler(netmsg_t);
473 static void bridge_del_bif(struct bridge_softc *, struct bridge_ifinfo *,
474 struct bridge_iflist_head *);
475 static void bridge_add_bif(struct bridge_softc *, struct bridge_ifinfo *,
478 SYSCTL_DECL(_net_link);
479 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
481 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
482 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
483 static int pfil_member = 1; /* run pfil hooks on the member interface */
484 static int bridge_debug;
485 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
486 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
487 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
488 &pfil_bridge, 0, "Packet filter on the bridge interface");
489 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
490 &pfil_member, 0, "Packet filter on the member interface");
491 SYSCTL_INT(_net_link_bridge, OID_AUTO, debug, CTLFLAG_RW,
492 &bridge_debug, 0, "Bridge debug mode");
494 struct bridge_control_arg {
496 struct ifbreq ifbreq;
497 struct ifbifconf ifbifconf;
498 struct ifbareq ifbareq;
499 struct ifbaconf ifbaconf;
500 struct ifbrparam ifbrparam;
507 struct bridge_control {
508 bridge_ctl_t bc_func;
513 #define BC_F_COPYIN 0x01 /* copy arguments in */
514 #define BC_F_COPYOUT 0x02 /* copy arguments out */
515 #define BC_F_SUSER 0x04 /* do super-user check */
517 const struct bridge_control bridge_control_table[] = {
518 { bridge_ioctl_add, sizeof(struct ifbreq),
519 BC_F_COPYIN|BC_F_SUSER },
520 { bridge_ioctl_del, sizeof(struct ifbreq),
521 BC_F_COPYIN|BC_F_SUSER },
523 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
524 BC_F_COPYIN|BC_F_COPYOUT },
525 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
526 BC_F_COPYIN|BC_F_SUSER },
528 { bridge_ioctl_scache, sizeof(struct ifbrparam),
529 BC_F_COPYIN|BC_F_SUSER },
530 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
533 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
534 BC_F_COPYIN|BC_F_COPYOUT },
535 { bridge_ioctl_rts, sizeof(struct ifbaconf),
536 BC_F_COPYIN|BC_F_COPYOUT },
538 { bridge_ioctl_saddr, sizeof(struct ifbareq),
539 BC_F_COPYIN|BC_F_SUSER },
541 { bridge_ioctl_sto, sizeof(struct ifbrparam),
542 BC_F_COPYIN|BC_F_SUSER },
543 { bridge_ioctl_gto, sizeof(struct ifbrparam),
546 { bridge_ioctl_daddr, sizeof(struct ifbareq),
547 BC_F_COPYIN|BC_F_SUSER },
549 { bridge_ioctl_flush, sizeof(struct ifbreq),
550 BC_F_COPYIN|BC_F_SUSER },
552 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
554 { bridge_ioctl_spri, sizeof(struct ifbrparam),
555 BC_F_COPYIN|BC_F_SUSER },
557 { bridge_ioctl_ght, sizeof(struct ifbrparam),
559 { bridge_ioctl_sht, sizeof(struct ifbrparam),
560 BC_F_COPYIN|BC_F_SUSER },
562 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
564 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
565 BC_F_COPYIN|BC_F_SUSER },
567 { bridge_ioctl_gma, sizeof(struct ifbrparam),
569 { bridge_ioctl_sma, sizeof(struct ifbrparam),
570 BC_F_COPYIN|BC_F_SUSER },
572 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
573 BC_F_COPYIN|BC_F_SUSER },
575 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
576 BC_F_COPYIN|BC_F_SUSER },
578 { bridge_ioctl_addspan, sizeof(struct ifbreq),
579 BC_F_COPYIN|BC_F_SUSER },
580 { bridge_ioctl_delspan, sizeof(struct ifbreq),
581 BC_F_COPYIN|BC_F_SUSER },
583 { bridge_ioctl_sifbondwght, sizeof(struct ifbreq),
584 BC_F_COPYIN|BC_F_SUSER },
587 static const int bridge_control_table_size = NELEM(bridge_control_table);
589 LIST_HEAD(, bridge_softc) bridge_list;
591 struct if_clone bridge_cloner = IF_CLONE_INITIALIZER("bridge",
593 bridge_clone_destroy, 0, IF_MAXUNIT);
596 bridge_modevent(module_t mod, int type, void *data)
600 LIST_INIT(&bridge_list);
601 if_clone_attach(&bridge_cloner);
602 bridge_input_p = bridge_input;
603 bridge_output_p = bridge_output;
604 bridge_interface_p = bridge_interface;
605 bridge_detach_cookie = EVENTHANDLER_REGISTER(
606 ifnet_detach_event, bridge_ifdetach, NULL,
607 EVENTHANDLER_PRI_ANY);
609 bstp_linkstate_p = bstp_linkstate;
613 if (!LIST_EMPTY(&bridge_list))
615 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
616 bridge_detach_cookie);
617 if_clone_detach(&bridge_cloner);
618 bridge_input_p = NULL;
619 bridge_output_p = NULL;
620 bridge_interface_p = NULL;
622 bstp_linkstate_p = NULL;
631 static moduledata_t bridge_mod = {
637 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
641 * bridge_clone_create:
643 * Create a new bridge instance.
646 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
648 struct bridge_softc *sc;
653 sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
654 ifp = sc->sc_ifp = &sc->sc_if;
656 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
657 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
658 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
659 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME;
660 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY;
661 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
662 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME;
664 /* Initialize our routing table. */
665 bridge_rtable_init(sc);
667 callout_init(&sc->sc_brcallout);
668 netmsg_init(&sc->sc_brtimemsg, NULL, &netisr_adone_rport,
669 MSGF_DROPABLE, bridge_timer_handler);
670 sc->sc_brtimemsg.lmsg.u.ms_resultp = sc;
672 callout_init(&sc->sc_bstpcallout);
673 netmsg_init(&sc->sc_bstptimemsg, NULL, &netisr_adone_rport,
674 MSGF_DROPABLE, bstp_tick_handler);
675 sc->sc_bstptimemsg.lmsg.u.ms_resultp = sc;
677 /* Initialize per-cpu member iface lists */
678 sc->sc_iflists = kmalloc(sizeof(*sc->sc_iflists) * ncpus,
680 for (cpu = 0; cpu < ncpus; ++cpu)
681 TAILQ_INIT(&sc->sc_iflists[cpu]);
683 TAILQ_INIT(&sc->sc_spanlist);
686 if_initname(ifp, ifc->ifc_name, unit);
687 ifp->if_mtu = ETHERMTU;
688 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST;
689 ifp->if_ioctl = bridge_ioctl;
690 ifp->if_start = bridge_start;
691 ifp->if_init = bridge_init;
692 ifp->if_type = IFT_ETHER;
693 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
694 ifq_set_ready(&ifp->if_snd);
695 ifp->if_hdrlen = ETHER_HDR_LEN;
698 * Generate a random ethernet address and use the private AC:DE:48
702 bcopy(&rnd, &eaddr[0], 4); /* ETHER_ADDR_LEN == 6 */
704 bcopy(&rnd, &eaddr[2], 4); /* ETHER_ADDR_LEN == 6 */
706 eaddr[0] &= ~1; /* clear multicast bit */
707 eaddr[0] |= 2; /* set the LAA bit */
709 ether_ifattach(ifp, eaddr, NULL);
710 /* Now undo some of the damage... */
711 ifp->if_baudrate = 0;
712 /*ifp->if_type = IFT_BRIDGE;*/
714 crit_enter(); /* XXX MP */
715 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
722 bridge_delete_dispatch(netmsg_t msg)
724 struct bridge_softc *sc = msg->lmsg.u.ms_resultp;
725 struct ifnet *bifp = sc->sc_ifp;
726 struct bridge_iflist *bif;
728 ifnet_serialize_all(bifp);
730 while ((bif = TAILQ_FIRST(&sc->sc_iflists[mycpuid])) != NULL)
731 bridge_delete_member(sc, bif, 0);
733 while ((bif = TAILQ_FIRST(&sc->sc_spanlist)) != NULL)
734 bridge_delete_span(sc, bif);
736 ifnet_deserialize_all(bifp);
738 lwkt_replymsg(&msg->lmsg, 0);
742 * bridge_clone_destroy:
744 * Destroy a bridge instance.
747 bridge_clone_destroy(struct ifnet *ifp)
749 struct bridge_softc *sc = ifp->if_softc;
750 struct netmsg_base msg;
752 ifnet_serialize_all(ifp);
755 ifp->if_flags &= ~IFF_UP;
757 ifnet_deserialize_all(ifp);
759 netmsg_init(&msg, NULL, &curthread->td_msgport,
760 0, bridge_delete_dispatch);
761 msg.lmsg.u.ms_resultp = sc;
762 lwkt_domsg(BRIDGE_CFGPORT, &msg.lmsg, 0);
764 crit_enter(); /* XXX MP */
765 LIST_REMOVE(sc, sc_list);
770 /* Tear down the routing table. */
771 bridge_rtable_fini(sc);
773 /* Free per-cpu member iface lists */
774 kfree(sc->sc_iflists, M_DEVBUF);
784 * Handle a control request from the operator.
787 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
789 struct bridge_softc *sc = ifp->if_softc;
790 struct bridge_control_arg args;
791 struct ifdrv *ifd = (struct ifdrv *) data;
792 const struct bridge_control *bc;
795 ASSERT_IFNET_SERIALIZED_ALL(ifp);
804 if (ifd->ifd_cmd >= bridge_control_table_size) {
808 bc = &bridge_control_table[ifd->ifd_cmd];
810 if (cmd == SIOCGDRVSPEC &&
811 (bc->bc_flags & BC_F_COPYOUT) == 0) {
814 } else if (cmd == SIOCSDRVSPEC &&
815 (bc->bc_flags & BC_F_COPYOUT)) {
820 if (bc->bc_flags & BC_F_SUSER) {
821 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
826 if (ifd->ifd_len != bc->bc_argsize ||
827 ifd->ifd_len > sizeof(args.bca_u)) {
832 memset(&args, 0, sizeof(args));
833 if (bc->bc_flags & BC_F_COPYIN) {
834 error = copyin(ifd->ifd_data, &args.bca_u,
840 error = bridge_control(sc, cmd, bc->bc_func, &args);
842 KKASSERT(args.bca_len == 0 && args.bca_kptr == NULL);
846 if (bc->bc_flags & BC_F_COPYOUT) {
847 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
848 if (args.bca_len != 0) {
849 KKASSERT(args.bca_kptr != NULL);
851 error = copyout(args.bca_kptr,
852 args.bca_uptr, args.bca_len);
854 kfree(args.bca_kptr, M_TEMP);
856 KKASSERT(args.bca_kptr == NULL);
859 KKASSERT(args.bca_len == 0 && args.bca_kptr == NULL);
864 if (!(ifp->if_flags & IFF_UP) &&
865 (ifp->if_flags & IFF_RUNNING)) {
867 * If interface is marked down and it is running,
871 } else if ((ifp->if_flags & IFF_UP) &&
872 !(ifp->if_flags & IFF_RUNNING)) {
874 * If interface is marked up and it is stopped, then
881 * If running and link flag state change we have to
882 * reinitialize as well.
884 if ((ifp->if_flags & IFF_RUNNING) &&
885 (ifp->if_flags & (IFF_LINK0|IFF_LINK1|IFF_LINK2)) !=
887 sc->sc_copy_flags = ifp->if_flags &
888 (IFF_LINK0|IFF_LINK1|IFF_LINK2);
889 bridge_control(sc, 0, bridge_ioctl_reinit, NULL);
895 /* Do not allow the MTU to be changed on the bridge */
900 error = ether_ioctl(ifp, cmd, data);
909 * Clear or restore unwanted capabilities on the member interface
912 bridge_mutecaps(struct bridge_ifinfo *bif_info, struct ifnet *ifp, int mute)
917 if (ifp->if_ioctl == NULL)
920 bzero(&ifr, sizeof(ifr));
921 ifr.ifr_reqcap = ifp->if_capenable;
924 /* mask off and save capabilities */
925 bif_info->bifi_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK;
926 if (bif_info->bifi_mutecap != 0)
927 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK;
929 /* restore muted capabilities */
930 ifr.ifr_reqcap |= bif_info->bifi_mutecap;
933 if (bif_info->bifi_mutecap != 0) {
934 ifnet_serialize_all(ifp);
935 error = ifp->if_ioctl(ifp, SIOCSIFCAP, (caddr_t)&ifr, NULL);
936 ifnet_deserialize_all(ifp);
941 * bridge_lookup_member:
943 * Lookup a bridge member interface.
945 static struct bridge_iflist *
946 bridge_lookup_member(struct bridge_softc *sc, const char *name)
948 struct bridge_iflist *bif;
950 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
951 if (strcmp(bif->bif_ifp->if_xname, name) == 0)
958 * bridge_lookup_member_if:
960 * Lookup a bridge member interface by ifnet*.
962 static struct bridge_iflist *
963 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
965 struct bridge_iflist *bif;
967 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
968 if (bif->bif_ifp == member_ifp)
975 * bridge_lookup_member_ifinfo:
977 * Lookup a bridge member interface by bridge_ifinfo.
979 static struct bridge_iflist *
980 bridge_lookup_member_ifinfo(struct bridge_softc *sc,
981 struct bridge_ifinfo *bif_info)
983 struct bridge_iflist *bif;
985 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
986 if (bif->bif_info == bif_info)
993 * bridge_delete_member:
995 * Delete the specified member interface.
998 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1001 struct ifnet *ifs = bif->bif_ifp;
1002 struct ifnet *bifp = sc->sc_ifp;
1003 struct bridge_ifinfo *bif_info = bif->bif_info;
1004 struct bridge_iflist_head saved_bifs;
1006 ASSERT_IFNET_SERIALIZED_ALL(bifp);
1007 KKASSERT(bif_info != NULL);
1009 ifs->if_bridge = NULL;
1012 * Release bridge interface's serializer:
1013 * - To avoid possible dead lock.
1014 * - Various sync operation will block the current thread.
1016 ifnet_deserialize_all(bifp);
1019 switch (ifs->if_type) {
1023 * Take the interface out of promiscuous mode.
1026 bridge_mutecaps(bif_info, ifs, 0);
1033 panic("bridge_delete_member: impossible");
1039 * Remove bifs from percpu linked list.
1041 * Removed bifs are not freed immediately, instead,
1042 * they are saved in saved_bifs. They will be freed
1043 * after we make sure that no one is accessing them,
1044 * i.e. after following netmsg_service_sync()
1046 TAILQ_INIT(&saved_bifs);
1047 bridge_del_bif(sc, bif_info, &saved_bifs);
1050 * Make sure that all protocol threads:
1051 * o see 'ifs' if_bridge is changed
1052 * o know that bif is removed from the percpu linked list
1054 netmsg_service_sync();
1057 * Free the removed bifs
1059 KKASSERT(!TAILQ_EMPTY(&saved_bifs));
1060 while ((bif = TAILQ_FIRST(&saved_bifs)) != NULL) {
1061 TAILQ_REMOVE(&saved_bifs, bif, bif_next);
1062 kfree(bif, M_DEVBUF);
1065 /* See the comment in bridge_ioctl_stop() */
1066 bridge_rtmsg_sync(sc);
1067 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL | IFBF_FLUSHSYNC);
1069 ifnet_serialize_all(bifp);
1071 if (bifp->if_flags & IFF_RUNNING)
1072 bstp_initialization(sc);
1075 * Free the bif_info after bstp_initialization(), so that
1076 * bridge_softc.sc_root_port will not reference a dangling
1079 kfree(bif_info, M_DEVBUF);
1083 * bridge_delete_span:
1085 * Delete the specified span interface.
1088 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1090 KASSERT(bif->bif_ifp->if_bridge == NULL,
1091 ("%s: not a span interface", __func__));
1093 TAILQ_REMOVE(&sc->sc_iflists[mycpuid], bif, bif_next);
1094 kfree(bif, M_DEVBUF);
1098 bridge_ioctl_init(struct bridge_softc *sc, void *arg __unused)
1100 struct ifnet *ifp = sc->sc_ifp;
1102 if (ifp->if_flags & IFF_RUNNING)
1105 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1108 ifp->if_flags |= IFF_RUNNING;
1109 bstp_initialization(sc);
1114 bridge_ioctl_stop(struct bridge_softc *sc, void *arg __unused)
1116 struct ifnet *ifp = sc->sc_ifp;
1117 struct lwkt_msg *lmsg;
1119 if ((ifp->if_flags & IFF_RUNNING) == 0)
1122 callout_stop(&sc->sc_brcallout);
1125 lmsg = &sc->sc_brtimemsg.lmsg;
1126 if ((lmsg->ms_flags & MSGF_DONE) == 0) {
1127 /* Pending to be processed; drop it */
1134 ifp->if_flags &= ~IFF_RUNNING;
1136 ifnet_deserialize_all(ifp);
1138 /* Let everyone know that we are stopped */
1139 netmsg_service_sync();
1142 * Sync ifnetX msgports in the order we forward rtnode
1143 * installation message. This is used to make sure that
1144 * all rtnode installation messages sent by bridge_rtupdate()
1145 * during above netmsg_service_sync() are flushed.
1147 bridge_rtmsg_sync(sc);
1148 bridge_rtflush(sc, IFBF_FLUSHDYN | IFBF_FLUSHSYNC);
1150 ifnet_serialize_all(ifp);
1155 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1157 struct ifbreq *req = arg;
1158 struct bridge_iflist *bif;
1159 struct bridge_ifinfo *bif_info;
1160 struct ifnet *ifs, *bifp;
1164 ASSERT_IFNET_SERIALIZED_ALL(bifp);
1166 ifs = ifunit(req->ifbr_ifsname);
1170 /* If it's in the span list, it can't be a member. */
1171 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next)
1172 if (ifs == bif->bif_ifp)
1175 /* Allow the first Ethernet member to define the MTU */
1176 if (ifs->if_type != IFT_GIF) {
1177 if (TAILQ_EMPTY(&sc->sc_iflists[mycpuid])) {
1178 bifp->if_mtu = ifs->if_mtu;
1179 } else if (bifp->if_mtu != ifs->if_mtu) {
1180 if_printf(bifp, "invalid MTU for %s\n", ifs->if_xname);
1185 if (ifs->if_bridge == sc)
1188 if (ifs->if_bridge != NULL)
1191 bif_info = kmalloc(sizeof(*bif_info), M_DEVBUF, M_WAITOK | M_ZERO);
1192 bif_info->bifi_priority = BSTP_DEFAULT_PORT_PRIORITY;
1193 bif_info->bifi_path_cost = BSTP_DEFAULT_PATH_COST;
1194 bif_info->bifi_ifp = ifs;
1195 bif_info->bifi_bond_weight = 1;
1198 * Release bridge interface's serializer:
1199 * - To avoid possible dead lock.
1200 * - Various sync operation will block the current thread.
1202 ifnet_deserialize_all(bifp);
1204 switch (ifs->if_type) {
1208 * Place the interface into promiscuous mode.
1210 error = ifpromisc(ifs, 1);
1212 ifnet_serialize_all(bifp);
1215 bridge_mutecaps(bif_info, ifs, 1);
1218 case IFT_GIF: /* :^) */
1223 ifnet_serialize_all(bifp);
1228 * Add bifs to percpu linked lists
1230 bridge_add_bif(sc, bif_info, ifs);
1232 ifnet_serialize_all(bifp);
1234 if (bifp->if_flags & IFF_RUNNING)
1235 bstp_initialization(sc);
1240 * Everything has been setup, so let the member interface
1241 * deliver packets to this bridge on its input/output path.
1243 ifs->if_bridge = sc;
1246 if (bif_info != NULL)
1247 kfree(bif_info, M_DEVBUF);
1253 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1255 struct ifbreq *req = arg;
1256 struct bridge_iflist *bif;
1258 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1262 bridge_delete_member(sc, bif, 0);
1268 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1270 struct ifbreq *req = arg;
1271 struct bridge_iflist *bif;
1273 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1276 bridge_ioctl_fillflags(sc, bif, req);
1281 bridge_ioctl_fillflags(struct bridge_softc *sc, struct bridge_iflist *bif,
1284 req->ifbr_ifsflags = bif->bif_flags;
1285 req->ifbr_state = bif->bif_state;
1286 req->ifbr_priority = bif->bif_priority;
1287 req->ifbr_path_cost = bif->bif_path_cost;
1288 req->ifbr_bond_weight = bif->bif_bond_weight;
1289 req->ifbr_portno = bif->bif_ifp->if_index & 0xff;
1290 if (bif->bif_flags & IFBIF_STP) {
1291 req->ifbr_peer_root = bif->bif_peer_root;
1292 req->ifbr_peer_bridge = bif->bif_peer_bridge;
1293 req->ifbr_peer_cost = bif->bif_peer_cost;
1294 req->ifbr_peer_port = bif->bif_peer_port;
1295 if (bstp_supersedes_port_info(sc, bif)) {
1296 req->ifbr_designated_root = bif->bif_peer_root;
1297 req->ifbr_designated_bridge = bif->bif_peer_bridge;
1298 req->ifbr_designated_cost = bif->bif_peer_cost;
1299 req->ifbr_designated_port = bif->bif_peer_port;
1301 req->ifbr_designated_root = sc->sc_bridge_id;
1302 req->ifbr_designated_bridge = sc->sc_bridge_id;
1303 req->ifbr_designated_cost = bif->bif_path_cost +
1305 req->ifbr_designated_port = bif->bif_port_id;
1308 req->ifbr_peer_root = 0;
1309 req->ifbr_peer_bridge = 0;
1310 req->ifbr_peer_cost = 0;
1311 req->ifbr_peer_port = 0;
1312 req->ifbr_designated_root = 0;
1313 req->ifbr_designated_bridge = 0;
1314 req->ifbr_designated_cost = 0;
1315 req->ifbr_designated_port = 0;
1320 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1322 struct ifbreq *req = arg;
1323 struct bridge_iflist *bif;
1324 struct ifnet *bifp = sc->sc_ifp;
1326 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1330 if (req->ifbr_ifsflags & IFBIF_SPAN) {
1331 /* SPAN is readonly */
1335 if (req->ifbr_ifsflags & IFBIF_STP) {
1336 switch (bif->bif_ifp->if_type) {
1338 /* These can do spanning tree. */
1342 /* Nothing else can. */
1347 bif->bif_flags = (bif->bif_flags & IFBIF_KEEPMASK) |
1348 (req->ifbr_ifsflags & ~IFBIF_KEEPMASK);
1349 if (bifp->if_flags & IFF_RUNNING)
1350 bstp_initialization(sc);
1356 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1358 struct ifbrparam *param = arg;
1359 struct ifnet *ifp = sc->sc_ifp;
1361 sc->sc_brtmax = param->ifbrp_csize;
1363 ifnet_deserialize_all(ifp);
1365 ifnet_serialize_all(ifp);
1371 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1373 struct ifbrparam *param = arg;
1375 param->ifbrp_csize = sc->sc_brtmax;
1381 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1383 struct bridge_control_arg *bc_arg = arg;
1384 struct ifbifconf *bifc = arg;
1385 struct bridge_iflist *bif;
1386 struct ifbreq *breq;
1390 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next)
1392 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next)
1395 if (bifc->ifbic_len == 0) {
1396 bifc->ifbic_len = sizeof(*breq) * count;
1398 } else if (count == 0 || bifc->ifbic_len < sizeof(*breq)) {
1399 bifc->ifbic_len = 0;
1403 len = min(bifc->ifbic_len, sizeof(*breq) * count);
1404 KKASSERT(len >= sizeof(*breq));
1406 breq = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1408 bifc->ifbic_len = 0;
1411 bc_arg->bca_kptr = breq;
1414 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
1415 if (len < sizeof(*breq))
1418 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname,
1419 sizeof(breq->ifbr_ifsname));
1420 bridge_ioctl_fillflags(sc, bif, breq);
1423 len -= sizeof(*breq);
1425 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1426 if (len < sizeof(*breq))
1429 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname,
1430 sizeof(breq->ifbr_ifsname));
1431 breq->ifbr_ifsflags = bif->bif_flags;
1432 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff;
1435 len -= sizeof(*breq);
1438 bifc->ifbic_len = sizeof(*breq) * count;
1439 KKASSERT(bifc->ifbic_len > 0);
1441 bc_arg->bca_len = bifc->ifbic_len;
1442 bc_arg->bca_uptr = bifc->ifbic_req;
1447 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1449 struct bridge_control_arg *bc_arg = arg;
1450 struct ifbaconf *bac = arg;
1451 struct bridge_rtnode *brt;
1452 struct ifbareq *bareq;
1456 LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list)
1459 if (bac->ifbac_len == 0) {
1460 bac->ifbac_len = sizeof(*bareq) * count;
1462 } else if (count == 0 || bac->ifbac_len < sizeof(*bareq)) {
1467 len = min(bac->ifbac_len, sizeof(*bareq) * count);
1468 KKASSERT(len >= sizeof(*bareq));
1470 bareq = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1471 if (bareq == NULL) {
1475 bc_arg->bca_kptr = bareq;
1478 LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) {
1479 struct bridge_rtinfo *bri = brt->brt_info;
1480 unsigned long expire;
1482 if (len < sizeof(*bareq))
1485 strlcpy(bareq->ifba_ifsname, bri->bri_ifp->if_xname,
1486 sizeof(bareq->ifba_ifsname));
1487 memcpy(bareq->ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1488 expire = bri->bri_expire;
1489 if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1490 time_second < expire)
1491 bareq->ifba_expire = expire - time_second;
1493 bareq->ifba_expire = 0;
1494 bareq->ifba_flags = bri->bri_flags;
1497 len -= sizeof(*bareq);
1500 bac->ifbac_len = sizeof(*bareq) * count;
1501 KKASSERT(bac->ifbac_len > 0);
1503 bc_arg->bca_len = bac->ifbac_len;
1504 bc_arg->bca_uptr = bac->ifbac_req;
1509 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1511 struct ifbareq *req = arg;
1512 struct bridge_iflist *bif;
1513 struct ifnet *ifp = sc->sc_ifp;
1516 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1518 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1522 ifnet_deserialize_all(ifp);
1523 error = bridge_rtsaddr(sc, req->ifba_dst, bif->bif_ifp,
1525 ifnet_serialize_all(ifp);
1530 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1532 struct ifbrparam *param = arg;
1534 sc->sc_brttimeout = param->ifbrp_ctime;
1540 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1542 struct ifbrparam *param = arg;
1544 param->ifbrp_ctime = sc->sc_brttimeout;
1550 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1552 struct ifbareq *req = arg;
1553 struct ifnet *ifp = sc->sc_ifp;
1556 ifnet_deserialize_all(ifp);
1557 error = bridge_rtdaddr(sc, req->ifba_dst);
1558 ifnet_serialize_all(ifp);
1563 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1565 struct ifbreq *req = arg;
1566 struct ifnet *ifp = sc->sc_ifp;
1568 ifnet_deserialize_all(ifp);
1569 bridge_rtflush(sc, req->ifbr_ifsflags | IFBF_FLUSHSYNC);
1570 ifnet_serialize_all(ifp);
1576 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1578 struct ifbrparam *param = arg;
1580 param->ifbrp_prio = sc->sc_bridge_priority;
1586 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1588 struct ifbrparam *param = arg;
1590 sc->sc_bridge_priority = param->ifbrp_prio;
1592 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1593 bstp_initialization(sc);
1599 bridge_ioctl_reinit(struct bridge_softc *sc, void *arg __unused)
1601 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1602 bstp_initialization(sc);
1607 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1609 struct ifbrparam *param = arg;
1611 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8;
1617 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1619 struct ifbrparam *param = arg;
1621 if (param->ifbrp_hellotime == 0)
1623 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8;
1625 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1626 bstp_initialization(sc);
1632 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1634 struct ifbrparam *param = arg;
1636 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8;
1642 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1644 struct ifbrparam *param = arg;
1646 if (param->ifbrp_fwddelay == 0)
1648 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8;
1650 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1651 bstp_initialization(sc);
1657 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1659 struct ifbrparam *param = arg;
1661 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8;
1667 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1669 struct ifbrparam *param = arg;
1671 if (param->ifbrp_maxage == 0)
1673 sc->sc_bridge_max_age = param->ifbrp_maxage << 8;
1675 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1676 bstp_initialization(sc);
1682 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1684 struct ifbreq *req = arg;
1685 struct bridge_iflist *bif;
1687 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1691 bif->bif_priority = req->ifbr_priority;
1693 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1694 bstp_initialization(sc);
1700 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1702 struct ifbreq *req = arg;
1703 struct bridge_iflist *bif;
1705 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1709 bif->bif_path_cost = req->ifbr_path_cost;
1711 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1712 bstp_initialization(sc);
1718 bridge_ioctl_sifbondwght(struct bridge_softc *sc, void *arg)
1720 struct ifbreq *req = arg;
1721 struct bridge_iflist *bif;
1723 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1727 bif->bif_bond_weight = req->ifbr_bond_weight;
1729 /* no reinit needed */
1735 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1737 struct ifbreq *req = arg;
1738 struct bridge_iflist *bif;
1740 struct bridge_ifinfo *bif_info;
1742 ifs = ifunit(req->ifbr_ifsname);
1746 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next)
1747 if (ifs == bif->bif_ifp)
1750 if (ifs->if_bridge != NULL)
1753 switch (ifs->if_type) {
1764 * bif_info is needed for bif_flags
1766 bif_info = kmalloc(sizeof(*bif_info), M_DEVBUF, M_WAITOK | M_ZERO);
1767 bif_info->bifi_ifp = ifs;
1769 bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK | M_ZERO);
1771 bif->bif_info = bif_info;
1772 bif->bif_flags = IFBIF_SPAN;
1773 /* NOTE: span bif does not need bridge_ifinfo */
1775 TAILQ_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1783 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1785 struct ifbreq *req = arg;
1786 struct bridge_iflist *bif;
1789 ifs = ifunit(req->ifbr_ifsname);
1793 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next)
1794 if (ifs == bif->bif_ifp)
1800 bridge_delete_span(sc, bif);
1802 if (TAILQ_EMPTY(&sc->sc_spanlist))
1809 bridge_ifdetach_dispatch(netmsg_t msg)
1811 struct ifnet *ifp, *bifp;
1812 struct bridge_softc *sc;
1813 struct bridge_iflist *bif;
1815 ifp = msg->lmsg.u.ms_resultp;
1816 sc = ifp->if_bridge;
1818 /* Check if the interface is a bridge member */
1822 ifnet_serialize_all(bifp);
1824 bif = bridge_lookup_member_if(sc, ifp);
1826 bridge_delete_member(sc, bif, 1);
1828 /* XXX Why bif will be NULL? */
1831 ifnet_deserialize_all(bifp);
1835 crit_enter(); /* XXX MP */
1837 /* Check if the interface is a span port */
1838 LIST_FOREACH(sc, &bridge_list, sc_list) {
1841 ifnet_serialize_all(bifp);
1843 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next)
1844 if (ifp == bif->bif_ifp) {
1845 bridge_delete_span(sc, bif);
1849 ifnet_deserialize_all(bifp);
1855 lwkt_replymsg(&msg->lmsg, 0);
1861 * Detach an interface from a bridge. Called when a member
1862 * interface is detaching.
1865 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1867 struct netmsg_base msg;
1869 netmsg_init(&msg, NULL, &curthread->td_msgport,
1870 0, bridge_ifdetach_dispatch);
1871 msg.lmsg.u.ms_resultp = ifp;
1873 lwkt_domsg(BRIDGE_CFGPORT, &msg.lmsg, 0);
1879 * Initialize a bridge interface.
1882 bridge_init(void *xsc)
1884 bridge_control(xsc, SIOCSIFFLAGS, bridge_ioctl_init, NULL);
1890 * Stop the bridge interface.
1893 bridge_stop(struct ifnet *ifp)
1895 bridge_control(ifp->if_softc, SIOCSIFFLAGS, bridge_ioctl_stop, NULL);
1899 * Returns TRUE if the packet is being sent 'from us'... from our bridge
1900 * interface or from any member of our bridge interface. This is used
1901 * later on to force the MAC to be the MAC of our bridge interface.
1904 bridge_from_us(struct bridge_softc *sc, struct ether_header *eh)
1906 struct bridge_iflist *bif;
1908 if (memcmp(eh->ether_shost, IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN) == 0)
1911 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
1912 if (memcmp(eh->ether_shost, IF_LLADDR(bif->bif_ifp),
1913 ETHER_ADDR_LEN) == 0) {
1923 * Enqueue a packet on a bridge member interface.
1927 bridge_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
1929 struct netmsg_packet *nmp;
1933 nmp = &m->m_hdr.mh_netmsg;
1934 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport,
1935 0, bridge_enqueue_handler);
1937 nmp->base.lmsg.u.ms_resultp = dst_ifp;
1939 lwkt_sendmsg(ifnet_portfn(mycpu->gd_cpuid), &nmp->base.lmsg);
1943 * After looking up dst_if in our forwarding table we still have to
1944 * deal with channel bonding. Find the best interface in the bonding set.
1946 static struct ifnet *
1947 bridge_select_unicast(struct bridge_softc *sc, struct ifnet *dst_if,
1948 int from_blocking, struct mbuf *m)
1950 struct bridge_iflist *bif, *nbif;
1951 struct ifnet *alt_if;
1956 * Unicast, kinda replicates the output side of bridge_output().
1958 * Even though this is a uni-cast packet we may have to select
1959 * an interface from a bonding set.
1961 bif = bridge_lookup_member_if(sc, dst_if);
1963 /* Not a member of the bridge (anymore?) */
1968 * If STP is enabled on the target we are an equal opportunity
1969 * employer and do not necessarily output to dst_if. Instead
1970 * scan available links with the same MAC as the current dst_if
1971 * and choose the best one.
1973 * We also need to do this because arp entries tag onto a particular
1974 * interface and if it happens to be dead then the packets will
1975 * go into a bit bucket.
1977 * If LINK2 is set the matching links are bonded and we-round robin.
1978 * (the MAC address must be the same for the participating links).
1979 * In this case links in a STP FORWARDING or BONDED state are
1980 * allowed for unicast packets.
1982 if (bif->bif_flags & IFBIF_STP) {
1987 TAILQ_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid],
1990 * dst_if may imply a bonding set so we must compare
1993 if (memcmp(IF_LLADDR(bif->bif_ifp),
1995 ETHER_ADDR_LEN) != 0) {
1999 if ((bif->bif_ifp->if_flags & IFF_RUNNING) == 0)
2003 * NOTE: We allow tranmissions through a BLOCKING
2004 * or LEARNING interface only as a last resort.
2005 * We DISALLOW both cases if the receiving
2007 * NOTE: If we send a packet through a learning
2008 * interface the receiving end (if also in
2009 * LEARNING) will throw it away, so this is
2010 * the ultimate last resort.
2012 switch(bif->bif_state) {
2013 case BSTP_IFSTATE_BLOCKING:
2014 if (from_blocking == 0 &&
2015 bif->bif_priority + 256 > alt_priority) {
2016 alt_priority = bif->bif_priority + 256;
2017 alt_if = bif->bif_ifp;
2020 case BSTP_IFSTATE_LEARNING:
2021 if (from_blocking == 0 &&
2022 bif->bif_priority > alt_priority) {
2023 alt_priority = bif->bif_priority;
2024 alt_if = bif->bif_ifp;
2027 case BSTP_IFSTATE_L1BLOCKING:
2028 case BSTP_IFSTATE_LISTENING:
2029 case BSTP_IFSTATE_DISABLED:
2032 /* FORWARDING, BONDED */
2037 * XXX we need to use the toepliz hash or
2038 * something like that instead of
2041 if (sc->sc_ifp->if_flags & IFF_LINK2) {
2042 dst_if = bif->bif_ifp;
2043 if (++bif->bif_bond_count >=
2044 bif->bif_bond_weight) {
2045 bif->bif_bond_count = 0;
2046 TAILQ_REMOVE(&sc->sc_iflists[mycpuid],
2049 &sc->sc_iflists[mycpuid],
2057 * Select best interface in the FORWARDING or
2058 * BONDED set. Well, there shouldn't be any
2059 * in a BONDED state if LINK2 is not set (they
2060 * will all be in a BLOCKING) state, but there
2061 * could be a transitory condition here.
2063 if (bif->bif_priority > priority) {
2064 priority = bif->bif_priority;
2065 dst_if = bif->bif_ifp;
2070 * If no suitable interfaces were found but a suitable
2071 * alternative interface was found, use the alternative
2074 if (priority == 0 && alt_if)
2079 * At this point, we're dealing with a unicast frame
2080 * going to a different interface.
2082 if ((dst_if->if_flags & IFF_RUNNING) == 0)
2091 * Send output from a bridge member interface. This
2092 * performs the bridging function for locally originated
2095 * The mbuf has the Ethernet header already attached. We must
2096 * enqueue or free the mbuf before returning.
2099 bridge_output(struct ifnet *ifp, struct mbuf *m)
2101 struct bridge_softc *sc = ifp->if_bridge;
2102 struct bridge_iflist *bif, *nbif;
2103 struct ether_header *eh;
2104 struct ifnet *dst_if, *alt_if, *bifp;
2108 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
2112 * Make sure that we are still a member of a bridge interface.
2123 if (m->m_len < ETHER_HDR_LEN) {
2124 m = m_pullup(m, ETHER_HDR_LEN);
2130 eh = mtod(m, struct ether_header *);
2131 from_us = bridge_from_us(sc, eh);
2134 * If bridge is down, but the original output interface is up,
2135 * go ahead and send out that interface. Otherwise, the packet
2138 if ((bifp->if_flags & IFF_RUNNING) == 0) {
2144 * If the packet is a multicast, or we don't know a better way to
2145 * get there, send to all interfaces.
2147 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2150 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
2152 if (dst_if == NULL) {
2162 TAILQ_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid],
2164 dst_if = bif->bif_ifp;
2166 if ((dst_if->if_flags & IFF_RUNNING) == 0)
2170 * If this is not the original output interface,
2171 * and the interface is participating in spanning
2172 * tree, make sure the port is in a state that
2173 * allows forwarding.
2175 * We keep track of a possible backup IF if we are
2176 * unable to find any interfaces to forward through.
2178 * NOTE: Currently round-robining is not implemented
2179 * across bonded interface groups (needs an
2180 * algorithm to track each group somehow).
2182 * Similarly we track only one alternative
2183 * interface if no suitable interfaces are
2186 if (dst_if != ifp &&
2187 (bif->bif_flags & IFBIF_STP) != 0) {
2188 switch (bif->bif_state) {
2189 case BSTP_IFSTATE_BONDED:
2190 if (bif->bif_priority + 512 >
2193 bif->bif_priority + 512;
2194 alt_if = bif->bif_ifp;
2197 case BSTP_IFSTATE_BLOCKING:
2198 if (bif->bif_priority + 256 >
2201 bif->bif_priority + 256;
2202 alt_if = bif->bif_ifp;
2205 case BSTP_IFSTATE_LEARNING:
2206 if (bif->bif_priority > alt_priority) {
2209 alt_if = bif->bif_ifp;
2212 case BSTP_IFSTATE_L1BLOCKING:
2213 case BSTP_IFSTATE_LISTENING:
2214 case BSTP_IFSTATE_DISABLED:
2222 KKASSERT(used == 0);
2223 if (TAILQ_NEXT(bif, bif_next) == NULL) {
2227 mc = m_copypacket(m, MB_DONTWAIT);
2235 * If the packet is 'from' us override ether_shost.
2237 bridge_handoff(sc, dst_if, mc, from_us);
2240 if (nbif != NULL && !nbif->bif_onlist) {
2241 KKASSERT(bif->bif_onlist);
2242 nbif = TAILQ_NEXT(bif, bif_next);
2247 * If we couldn't find anything use the backup interface
2250 if (found == 0 && alt_if) {
2251 KKASSERT(used == 0);
2254 bridge_handoff(sc, alt_if, mc, from_us);
2266 dst_if = bridge_select_unicast(sc, dst_if, 0, m);
2273 bridge_handoff(sc, dst_if, m, from_us);
2278 * Returns the bridge interface associated with an ifc.
2279 * Pass ifp->if_bridge (must not be NULL). Used by the ARP
2280 * code to supply the bridge for the is-at info, making
2281 * the bridge responsible for matching local addresses.
2283 * Without this the ARP code will supply bridge member interfaces
2284 * for the is-at which makes it difficult the bridge to fail-over
2285 * interfaces (amoung other things).
2287 static struct ifnet *
2288 bridge_interface(void *if_bridge)
2290 struct bridge_softc *sc = if_bridge;
2291 return (sc->sc_ifp);
2297 * Start output on a bridge.
2300 bridge_start(struct ifnet *ifp)
2302 struct bridge_softc *sc = ifp->if_softc;
2304 ASSERT_IFNET_SERIALIZED_TX(ifp);
2306 ifp->if_flags |= IFF_OACTIVE;
2308 struct ifnet *dst_if = NULL;
2309 struct ether_header *eh;
2312 m = ifq_dequeue(&ifp->if_snd, NULL);
2317 if (m->m_len < sizeof(*eh)) {
2318 m = m_pullup(m, sizeof(*eh));
2324 eh = mtod(m, struct ether_header *);
2329 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0)
2330 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
2333 * Multicast or broadcast
2335 if (dst_if == NULL) {
2336 bridge_start_bcast(sc, m);
2343 dst_if = bridge_select_unicast(sc, dst_if, 0, m);
2348 bridge_enqueue(dst_if, m);
2350 ifp->if_flags &= ~IFF_OACTIVE;
2356 * Forward packets received on a bridge interface via the input
2359 * This implements the forwarding function of the bridge.
2362 bridge_forward(struct bridge_softc *sc, struct mbuf *m)
2364 struct bridge_iflist *bif;
2365 struct ifnet *src_if, *dst_if, *ifp;
2366 struct ether_header *eh;
2370 src_if = m->m_pkthdr.rcvif;
2373 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
2376 ifp->if_ibytes += m->m_pkthdr.len;
2379 * Look up the bridge_iflist.
2381 bif = bridge_lookup_member_if(sc, src_if);
2383 /* Interface is not a bridge member (anymore?) */
2389 * In spanning tree mode receiving a packet from an interface
2390 * in a BLOCKING state is allowed, it could be a member of last
2391 * resort from the sender's point of view, but forwarding it is
2394 * The sender's spanning tree will eventually sync up and the
2395 * sender will go into a BLOCKING state too (but this still may be
2396 * an interface of last resort during state changes).
2398 if (bif->bif_flags & IFBIF_STP) {
2399 switch (bif->bif_state) {
2400 case BSTP_IFSTATE_L1BLOCKING:
2401 case BSTP_IFSTATE_LISTENING:
2402 case BSTP_IFSTATE_DISABLED:
2406 /* learning, blocking, bonded, forwarding */
2410 from_blocking = (bif->bif_state == BSTP_IFSTATE_BLOCKING);
2412 eh = mtod(m, struct ether_header *);
2415 * If the interface is learning, and the source
2416 * address is valid and not multicast, record
2419 if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
2420 from_blocking == 0 &&
2421 ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
2422 (eh->ether_shost[0] == 0 &&
2423 eh->ether_shost[1] == 0 &&
2424 eh->ether_shost[2] == 0 &&
2425 eh->ether_shost[3] == 0 &&
2426 eh->ether_shost[4] == 0 &&
2427 eh->ether_shost[5] == 0) == 0) {
2428 bridge_rtupdate(sc, eh->ether_shost, src_if, IFBAF_DYNAMIC);
2432 * Don't forward from an interface in the listening or learning
2433 * state. That is, in the learning state we learn information
2434 * but we throw away the packets.
2436 * We let through packets on interfaces in the blocking state.
2437 * The blocking state is applicable to the send side, not the
2440 if ((bif->bif_flags & IFBIF_STP) != 0 &&
2441 (bif->bif_state == BSTP_IFSTATE_LISTENING ||
2442 bif->bif_state == BSTP_IFSTATE_LEARNING)) {
2448 * At this point, the port either doesn't participate
2449 * in spanning tree or it is in the forwarding state.
2453 * If the packet is unicast, destined for someone on
2454 * "this" side of the bridge, drop it.
2456 * src_if implies the entire bonding set so we have to compare MAC
2457 * addresses and not just if pointers.
2459 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2460 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
2461 if (dst_if && memcmp(IF_LLADDR(src_if), IF_LLADDR(dst_if),
2462 ETHER_ADDR_LEN) == 0) {
2467 /* ...forward it to all interfaces. */
2473 * Brodcast if we do not have forwarding information. However, if
2474 * we received the packet on a blocking interface we do not do this
2475 * (unless you really want to blow up your network).
2477 if (dst_if == NULL) {
2481 bridge_broadcast(sc, src_if, m);
2485 dst_if = bridge_select_unicast(sc, dst_if, from_blocking, m);
2487 if (dst_if == NULL) {
2492 if (inet_pfil_hook.ph_hashooks > 0
2494 || inet6_pfil_hook.ph_hashooks > 0
2497 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2502 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2507 bridge_handoff(sc, dst_if, m, 0);
2513 * Receive input from a member interface. Queue the packet for
2514 * bridging if it is not for us.
2516 static struct mbuf *
2517 bridge_input(struct ifnet *ifp, struct mbuf *m)
2519 struct bridge_softc *sc = ifp->if_bridge;
2520 struct bridge_iflist *bif;
2521 struct ifnet *bifp, *new_ifp;
2522 struct ether_header *eh;
2523 struct mbuf *mc, *mc2;
2526 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
2530 * Make sure that we are still a member of a bridge interface.
2538 if ((bifp->if_flags & IFF_RUNNING) == 0)
2542 * Implement support for bridge monitoring. If this flag has been
2543 * set on this interface, discard the packet once we push it through
2544 * the bpf(4) machinery, but before we do, increment various counters
2545 * associated with this bridge.
2547 if (bifp->if_flags & IFF_MONITOR) {
2548 /* Change input interface to this bridge */
2549 m->m_pkthdr.rcvif = bifp;
2553 /* Update bridge's ifnet statistics */
2554 bifp->if_ipackets++;
2555 bifp->if_ibytes += m->m_pkthdr.len;
2556 if (m->m_flags & (M_MCAST | M_BCAST))
2565 * Handle the ether_header
2567 * In all cases if the packet is destined for us via our MAC
2568 * we must clear BRIDGE_MBUF_TAGGED to ensure that we don't
2569 * repeat the source MAC out the same interface.
2571 * This first test against our bridge MAC is the fast-path.
2573 * NOTE! The bridge interface can serve as an endpoint for
2574 * communication but normally there are no IPs associated
2575 * with it so you cannot route through it. Instead what
2576 * you do is point your default route *THROUGH* the bridge
2577 * to the actual default router for one of the bridged spaces.
2579 * Another possibility is to put all your IP specifications
2580 * on the bridge instead of on the individual interfaces. If
2581 * you do this it should be possible to use the bridge as an
2582 * end point and route (rather than switch) through it using
2583 * the default route or ipfw forwarding rules.
2589 if (m->m_len < ETHER_HDR_LEN) {
2590 m = m_pullup(m, ETHER_HDR_LEN);
2594 eh = mtod(m, struct ether_header *);
2595 m->m_pkthdr.fw_flags |= BRIDGE_MBUF_TAGGED;
2596 bcopy(eh, &m->m_pkthdr.br.ether, sizeof(*eh));
2598 if ((bridge_debug & 1) &&
2599 (ntohs(eh->ether_type) == ETHERTYPE_ARP ||
2600 ntohs(eh->ether_type) == ETHERTYPE_REVARP)) {
2601 kprintf("%02x:%02x:%02x:%02x:%02x:%02x "
2602 "%02x:%02x:%02x:%02x:%02x:%02x type %04x "
2603 "lla %02x:%02x:%02x:%02x:%02x:%02x\n",
2617 ((u_char *)IF_LLADDR(bifp))[0],
2618 ((u_char *)IF_LLADDR(bifp))[1],
2619 ((u_char *)IF_LLADDR(bifp))[2],
2620 ((u_char *)IF_LLADDR(bifp))[3],
2621 ((u_char *)IF_LLADDR(bifp))[4],
2622 ((u_char *)IF_LLADDR(bifp))[5]
2626 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
2628 * If the packet is for us, set the packets source as the
2629 * bridge, and return the packet back to ifnet.if_input for
2632 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2633 KASSERT(bifp->if_bridge == NULL,
2634 ("loop created in bridge_input"));
2635 if (pfil_member != 0) {
2636 if (inet_pfil_hook.ph_hashooks > 0
2638 || inet6_pfil_hook.ph_hashooks > 0
2641 if (bridge_pfil(&m, NULL, ifp, PFIL_IN) != 0)
2652 * Tap all packets arriving on the bridge, no matter if
2653 * they are local destinations or not. In is in.
2657 bif = bridge_lookup_member_if(sc, ifp);
2664 if (m->m_flags & (M_BCAST | M_MCAST)) {
2666 * Tap off 802.1D packets; they do not get forwarded.
2668 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2669 ETHER_ADDR_LEN) == 0) {
2670 ifnet_serialize_all(bifp);
2671 bstp_input(sc, bif, m);
2672 ifnet_deserialize_all(bifp);
2674 /* m is freed by bstp_input */
2680 * Other than 802.11d packets, ignore packets if the
2681 * interface is not in a good state.
2683 * NOTE: Broadcast/mcast packets received on a blocking or
2684 * learning interface are allowed for local processing.
2686 * The sending side of a blocked port will stop
2687 * transmitting when a better alternative is found.
2688 * However, later on we will disallow the forwarding
2689 * of bcast/mcsat packets over a blocking interface.
2691 if (bif->bif_flags & IFBIF_STP) {
2692 switch (bif->bif_state) {
2693 case BSTP_IFSTATE_L1BLOCKING:
2694 case BSTP_IFSTATE_LISTENING:
2695 case BSTP_IFSTATE_DISABLED:
2698 /* blocking, learning, bonded, forwarding */
2704 * Make a deep copy of the packet and enqueue the copy
2705 * for bridge processing; return the original packet for
2708 mc = m_dup(m, MB_DONTWAIT);
2713 * It's just too dangerous to allow bcast/mcast over a
2714 * blocked interface, eventually the network will sort
2715 * itself out and a better path will be found.
2717 if ((bif->bif_flags & IFBIF_STP) == 0 ||
2718 bif->bif_state != BSTP_IFSTATE_BLOCKING) {
2719 bridge_forward(sc, mc);
2723 * Reinject the mbuf as arriving on the bridge so we have a
2724 * chance at claiming multicast packets. We can not loop back
2725 * here from ether_input as a bridge is never a member of a
2728 KASSERT(bifp->if_bridge == NULL,
2729 ("loop created in bridge_input"));
2730 mc2 = m_dup(m, MB_DONTWAIT);
2733 /* Keep the layer3 header aligned */
2734 int i = min(mc2->m_pkthdr.len, max_protohdr);
2735 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2740 * Don't tap to bpf(4) again; we have already done
2743 * Leave m_pkthdr.rcvif alone, so ARP replies are
2744 * processed as coming in on the correct interface.
2746 * Clear the bridge flag for local processing in
2747 * case the packet gets routed.
2749 mc2->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2750 ether_reinput_oncpu(bifp, mc2, 0);
2753 /* Return the original packet for local processing. */
2758 * Input of a unicast packet. We have to allow unicast packets
2759 * input from links in the BLOCKING state as this might be an
2760 * interface of last resort.
2762 * NOTE: We explicitly ignore normal packets received on a link
2763 * in the BLOCKING state. The point of being in that state
2764 * is to avoid getting duplicate packets.
2766 * HOWEVER, if LINK2 is set the normal spanning tree code
2767 * will mark an interface BLOCKING to avoid multi-cast/broadcast
2768 * loops. Unicast packets CAN still loop if we allow the
2769 * case (hence we only do it in LINK2), but it isn't quite as
2770 * bad as a broadcast packet looping.
2773 if (bif->bif_flags & IFBIF_STP) {
2774 switch (bif->bif_state) {
2775 case BSTP_IFSTATE_L1BLOCKING:
2776 case BSTP_IFSTATE_LISTENING:
2777 case BSTP_IFSTATE_DISABLED:
2779 case BSTP_IFSTATE_BLOCKING:
2783 /* blocking, bonded, forwarding, learning */
2789 * Unicast. Make sure it's not for us.
2791 * This loop is MPSAFE; the only blocking operation (bridge_rtupdate)
2792 * is followed by breaking out of the loop.
2794 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
2795 if (bif->bif_ifp->if_type != IFT_ETHER)
2799 * It is destined for an interface linked to the bridge.
2800 * We want the bridge itself to take care of link level
2801 * forwarding to member interfaces so reinput on the bridge.
2802 * i.e. if you ping an IP on a target interface associated
2803 * with the bridge, the arp is-at response should indicate
2806 * Only update our addr list when learning if the port
2807 * is not in a blocking state. If it is we still allow
2808 * the packet but we do not try to learn from it.
2810 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost,
2811 ETHER_ADDR_LEN) == 0) {
2812 if (bif->bif_ifp != ifp) {
2813 /* XXX loop prevention */
2814 m->m_flags |= M_ETHER_BRIDGED;
2816 if ((bif->bif_flags & IFBIF_LEARNING) &&
2817 bif->bif_state != BSTP_IFSTATE_BLOCKING) {
2818 bridge_rtupdate(sc, eh->ether_shost,
2819 ifp, IFBAF_DYNAMIC);
2821 new_ifp = bifp; /* not bif->bif_ifp */
2822 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2827 * Ignore received packets that were sent by us.
2829 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost,
2830 ETHER_ADDR_LEN) == 0) {
2840 * Perform the bridge forwarding function, but disallow bridging
2841 * to interfaces in the blocking state if the packet came in on
2842 * an interface in the blocking state.
2844 bridge_forward(sc, m);
2848 * ether_reinput_oncpu() will reprocess rcvif as
2849 * coming from new_ifp (since we do not specify
2850 * REINPUT_KEEPRCVIF).
2853 if (new_ifp != NULL) {
2855 * Clear the bridge flag for local processing in
2856 * case the packet gets routed.
2858 ether_reinput_oncpu(new_ifp, m, REINPUT_RUNBPF);
2865 * bridge_start_bcast:
2867 * Broadcast the packet sent from bridge to all member
2869 * This is a simplified version of bridge_broadcast(), however,
2870 * this function expects caller to hold bridge's serializer.
2873 bridge_start_bcast(struct bridge_softc *sc, struct mbuf *m)
2875 struct bridge_iflist *bif;
2877 struct ifnet *dst_if, *alt_if, *bifp;
2884 ASSERT_IFNET_SERIALIZED_ALL(bifp);
2887 * Following loop is MPSAFE; nothing is blocking
2890 * NOTE: We transmit through an member in the BLOCKING state only
2896 TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) {
2897 dst_if = bif->bif_ifp;
2899 if (bif->bif_flags & IFBIF_STP) {
2900 switch (bif->bif_state) {
2901 case BSTP_IFSTATE_BLOCKING:
2902 if (bif->bif_priority > alt_priority) {
2903 alt_priority = bif->bif_priority;
2904 alt_if = bif->bif_ifp;
2907 case BSTP_IFSTATE_L1BLOCKING:
2908 case BSTP_IFSTATE_DISABLED:
2911 /* listening, learning, bonded, forwarding */
2916 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 &&
2917 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2920 if ((dst_if->if_flags & IFF_RUNNING) == 0)
2923 if (TAILQ_NEXT(bif, bif_next) == NULL) {
2927 mc = m_copypacket(m, MB_DONTWAIT);
2934 bridge_enqueue(dst_if, mc);
2937 if (found == 0 && alt_if) {
2938 KKASSERT(used == 0);
2941 bridge_enqueue(alt_if, mc);
2951 * Send a frame to all interfaces that are members of
2952 * the bridge, except for the one on which the packet
2956 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2959 struct bridge_iflist *bif, *nbif;
2960 struct ether_header *eh;
2962 struct ifnet *dst_if, *alt_if, *bifp;
2970 ASSERT_IFNET_NOT_SERIALIZED_ALL(bifp);
2972 eh = mtod(m, struct ether_header *);
2973 from_us = bridge_from_us(sc, eh);
2975 if (inet_pfil_hook.ph_hashooks > 0
2977 || inet6_pfil_hook.ph_hashooks > 0
2980 if (bridge_pfil(&m, bifp, src_if, PFIL_IN) != 0)
2985 /* Filter on the bridge interface before broadcasting */
2986 if (bridge_pfil(&m, bifp, NULL, PFIL_OUT) != 0)
2997 TAILQ_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) {
2998 dst_if = bif->bif_ifp;
3000 if ((dst_if->if_flags & IFF_RUNNING) == 0)
3004 * Don't bounce the packet out the same interface it came
3005 * in on. We have to test MAC addresses because a packet
3006 * can come in a bonded interface and we don't want it to
3007 * be echod out the forwarding interface for the same bonding
3010 if (src_if && memcmp(IF_LLADDR(src_if), IF_LLADDR(dst_if),
3011 ETHER_ADDR_LEN) == 0) {
3016 * Generally speaking we only broadcast through forwarding
3017 * interfaces. If no interfaces are available we select
3018 * a BONDED, BLOCKING, or LEARNING interface to forward
3021 if (bif->bif_flags & IFBIF_STP) {
3022 switch (bif->bif_state) {
3023 case BSTP_IFSTATE_BONDED:
3024 if (bif->bif_priority + 512 > alt_priority) {
3025 alt_priority = bif->bif_priority + 512;
3026 alt_if = bif->bif_ifp;
3029 case BSTP_IFSTATE_BLOCKING:
3030 if (bif->bif_priority + 256 > alt_priority) {
3031 alt_priority = bif->bif_priority + 256;
3032 alt_if = bif->bif_ifp;
3035 case BSTP_IFSTATE_LEARNING:
3036 if (bif->bif_priority > alt_priority) {
3037 alt_priority = bif->bif_priority;
3038 alt_if = bif->bif_ifp;
3041 case BSTP_IFSTATE_L1BLOCKING:
3042 case BSTP_IFSTATE_DISABLED:
3043 case BSTP_IFSTATE_LISTENING:
3051 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 &&
3052 (m->m_flags & (M_BCAST|M_MCAST)) == 0) {
3056 if (TAILQ_NEXT(bif, bif_next) == NULL) {
3060 mc = m_copypacket(m, MB_DONTWAIT);
3062 sc->sc_ifp->if_oerrors++;
3069 * Filter on the output interface. Pass a NULL bridge
3070 * interface pointer so we do not redundantly filter on
3071 * the bridge for each interface we broadcast on.
3073 if (inet_pfil_hook.ph_hashooks > 0
3075 || inet6_pfil_hook.ph_hashooks > 0
3078 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
3083 bridge_handoff(sc, dst_if, mc, from_us);
3085 if (nbif != NULL && !nbif->bif_onlist) {
3086 KKASSERT(bif->bif_onlist);
3087 nbif = TAILQ_NEXT(bif, bif_next);
3091 if (found == 0 && alt_if) {
3092 KKASSERT(used == 0);
3095 bridge_enqueue(alt_if, mc);
3105 * Duplicate a packet out one or more interfaces that are in span mode,
3106 * the original mbuf is unmodified.
3109 bridge_span(struct bridge_softc *sc, struct mbuf *m)
3111 struct bridge_iflist *bif;
3112 struct ifnet *dst_if, *bifp;
3117 ifnet_serialize_all(bifp);
3119 TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) {
3120 dst_if = bif->bif_ifp;
3122 if ((dst_if->if_flags & IFF_RUNNING) == 0)
3125 mc = m_copypacket(m, MB_DONTWAIT);
3127 sc->sc_ifp->if_oerrors++;
3130 bridge_enqueue(dst_if, mc);
3133 ifnet_deserialize_all(bifp);
3137 bridge_rtmsg_sync_handler(netmsg_t msg)
3139 ifnet_forwardmsg(&msg->lmsg, mycpuid + 1);
3143 bridge_rtmsg_sync(struct bridge_softc *sc)
3145 struct netmsg_base msg;
3147 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
3149 netmsg_init(&msg, NULL, &curthread->td_msgport,
3150 0, bridge_rtmsg_sync_handler);
3151 ifnet_domsg(&msg.lmsg, 0);
3154 static __inline void
3155 bridge_rtinfo_update(struct bridge_rtinfo *bri, struct ifnet *dst_if,
3156 int setflags, uint8_t flags, uint32_t timeo)
3158 if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
3159 bri->bri_ifp != dst_if)
3160 bri->bri_ifp = dst_if;
3161 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
3162 bri->bri_expire != time_second + timeo)
3163 bri->bri_expire = time_second + timeo;
3165 bri->bri_flags = flags;
3169 bridge_rtinstall_oncpu(struct bridge_softc *sc, const uint8_t *dst,
3170 struct ifnet *dst_if, int setflags, uint8_t flags,
3171 struct bridge_rtinfo **bri0)
3173 struct bridge_rtnode *brt;
3174 struct bridge_rtinfo *bri;
3177 brt = bridge_rtnode_lookup(sc, dst);
3180 * rtnode for 'dst' already exists. We inform the
3181 * caller about this by leaving bri0 as NULL. The
3182 * caller will terminate the intallation upon getting
3183 * NULL bri0. However, we still need to update the
3186 KKASSERT(*bri0 == NULL);
3189 bridge_rtinfo_update(brt->brt_info, dst_if, setflags,
3190 flags, sc->sc_brttimeout);
3195 * We only need to check brtcnt on CPU0, since if limit
3196 * is to be exceeded, ENOSPC is returned. Caller knows
3197 * this and will terminate the installation.
3199 if (sc->sc_brtcnt >= sc->sc_brtmax)
3202 KKASSERT(*bri0 == NULL);
3203 bri = kmalloc(sizeof(struct bridge_rtinfo), M_DEVBUF,
3208 bri->bri_flags = IFBAF_DYNAMIC;
3209 bridge_rtinfo_update(bri, dst_if, setflags, flags,
3213 KKASSERT(bri != NULL);
3216 brt = kmalloc(sizeof(struct bridge_rtnode), M_DEVBUF,
3218 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
3219 brt->brt_info = bri;
3221 bridge_rtnode_insert(sc, brt);
3226 bridge_rtinstall_handler(netmsg_t msg)
3228 struct netmsg_brsaddr *brmsg = (struct netmsg_brsaddr *)msg;
3231 error = bridge_rtinstall_oncpu(brmsg->br_softc,
3232 brmsg->br_dst, brmsg->br_dst_if,
3233 brmsg->br_setflags, brmsg->br_flags,
3236 KKASSERT(mycpuid == 0 && brmsg->br_rtinfo == NULL);
3237 lwkt_replymsg(&brmsg->base.lmsg, error);
3239 } else if (brmsg->br_rtinfo == NULL) {
3240 /* rtnode already exists for 'dst' */
3241 KKASSERT(mycpuid == 0);
3242 lwkt_replymsg(&brmsg->base.lmsg, 0);
3245 ifnet_forwardmsg(&brmsg->base.lmsg, mycpuid + 1);
3251 * Add/Update a bridge routing entry.
3254 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
3255 struct ifnet *dst_if, uint8_t flags)
3257 struct bridge_rtnode *brt;
3260 * A route for this destination might already exist. If so,
3261 * update it, otherwise create a new one.
3263 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) {
3264 struct netmsg_brsaddr *brmsg;
3266 if (sc->sc_brtcnt >= sc->sc_brtmax)
3269 brmsg = kmalloc(sizeof(*brmsg), M_LWKTMSG, M_WAITOK | M_NULLOK);
3273 netmsg_init(&brmsg->base, NULL, &netisr_afree_rport,
3274 0, bridge_rtinstall_handler);
3275 memcpy(brmsg->br_dst, dst, ETHER_ADDR_LEN);
3276 brmsg->br_dst_if = dst_if;
3277 brmsg->br_flags = flags;
3278 brmsg->br_setflags = 0;
3279 brmsg->br_softc = sc;
3280 brmsg->br_rtinfo = NULL;
3282 ifnet_sendmsg(&brmsg->base.lmsg, 0);
3285 bridge_rtinfo_update(brt->brt_info, dst_if, 0, flags,
3291 bridge_rtsaddr(struct bridge_softc *sc, const uint8_t *dst,
3292 struct ifnet *dst_if, uint8_t flags)
3294 struct netmsg_brsaddr brmsg;
3296 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
3298 netmsg_init(&brmsg.base, NULL, &curthread->td_msgport,
3299 0, bridge_rtinstall_handler);
3300 memcpy(brmsg.br_dst, dst, ETHER_ADDR_LEN);
3301 brmsg.br_dst_if = dst_if;
3302 brmsg.br_flags = flags;
3303 brmsg.br_setflags = 1;
3304 brmsg.br_softc = sc;
3305 brmsg.br_rtinfo = NULL;
3307 return ifnet_domsg(&brmsg.base.lmsg, 0);
3313 * Lookup the destination interface for an address.
3315 static struct ifnet *
3316 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr)
3318 struct bridge_rtnode *brt;
3320 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
3322 return brt->brt_info->bri_ifp;
3326 bridge_rtreap_handler(netmsg_t msg)
3328 struct bridge_softc *sc = msg->lmsg.u.ms_resultp;
3329 struct bridge_rtnode *brt, *nbrt;
3331 LIST_FOREACH_MUTABLE(brt, &sc->sc_rtlists[mycpuid], brt_list, nbrt) {
3332 if (brt->brt_info->bri_dead)
3333 bridge_rtnode_destroy(sc, brt);
3335 ifnet_forwardmsg(&msg->lmsg, mycpuid + 1);
3339 bridge_rtreap(struct bridge_softc *sc)
3341 struct netmsg_base msg;
3343 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
3345 netmsg_init(&msg, NULL, &curthread->td_msgport,
3346 0, bridge_rtreap_handler);
3347 msg.lmsg.u.ms_resultp = sc;
3349 ifnet_domsg(&msg.lmsg, 0);
3353 bridge_rtreap_async(struct bridge_softc *sc)
3355 struct netmsg_base *msg;
3357 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK);
3359 netmsg_init(msg, NULL, &netisr_afree_rport,
3360 0, bridge_rtreap_handler);
3361 msg->lmsg.u.ms_resultp = sc;
3363 ifnet_sendmsg(&msg->lmsg, 0);
3369 * Trim the routine table so that we have a number
3370 * of routing entries less than or equal to the
3374 bridge_rttrim(struct bridge_softc *sc)
3376 struct bridge_rtnode *brt;
3379 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
3381 /* Make sure we actually need to do this. */
3382 if (sc->sc_brtcnt <= sc->sc_brtmax)
3386 * Find out how many rtnodes are dead
3388 dead = bridge_rtage_finddead(sc);
3389 KKASSERT(dead <= sc->sc_brtcnt);
3391 if (sc->sc_brtcnt - dead <= sc->sc_brtmax) {
3392 /* Enough dead rtnodes are found */
3398 * Kill some dynamic rtnodes to meet the brtmax
3400 LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) {
3401 struct bridge_rtinfo *bri = brt->brt_info;
3403 if (bri->bri_dead) {
3405 * We have counted this rtnode in
3406 * bridge_rtage_finddead()
3411 if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
3414 KKASSERT(dead <= sc->sc_brtcnt);
3416 if (sc->sc_brtcnt - dead <= sc->sc_brtmax) {
3417 /* Enough rtnodes are collected */
3429 * Aging timer for the bridge.
3432 bridge_timer(void *arg)
3434 struct bridge_softc *sc = arg;
3435 struct netmsg_base *msg;
3437 KKASSERT(mycpuid == BRIDGE_CFGCPU);
3441 if (callout_pending(&sc->sc_brcallout) ||
3442 !callout_active(&sc->sc_brcallout)) {
3446 callout_deactivate(&sc->sc_brcallout);
3448 msg = &sc->sc_brtimemsg;
3449 KKASSERT(msg->lmsg.ms_flags & MSGF_DONE);
3450 lwkt_sendmsg(BRIDGE_CFGPORT, &msg->lmsg);
3456 bridge_timer_handler(netmsg_t msg)
3458 struct bridge_softc *sc = msg->lmsg.u.ms_resultp;
3460 KKASSERT(&curthread->td_msgport == BRIDGE_CFGPORT);
3464 lwkt_replymsg(&msg->lmsg, 0);
3468 if (sc->sc_ifp->if_flags & IFF_RUNNING) {
3469 callout_reset(&sc->sc_brcallout,
3470 bridge_rtable_prune_period * hz, bridge_timer, sc);
3475 bridge_rtage_finddead(struct bridge_softc *sc)
3477 struct bridge_rtnode *brt;
3480 LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) {
3481 struct bridge_rtinfo *bri = brt->brt_info;
3483 if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
3484 time_second >= bri->bri_expire) {
3487 KKASSERT(dead <= sc->sc_brtcnt);
3496 * Perform an aging cycle.
3499 bridge_rtage(struct bridge_softc *sc)
3501 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
3503 if (bridge_rtage_finddead(sc))
3510 * Remove all dynamic addresses from the bridge.
3513 bridge_rtflush(struct bridge_softc *sc, int bf)
3515 struct bridge_rtnode *brt;
3519 LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) {
3520 struct bridge_rtinfo *bri = brt->brt_info;
3522 if ((bf & IFBF_FLUSHALL) ||
3523 (bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
3529 if (bf & IFBF_FLUSHSYNC)
3532 bridge_rtreap_async(sc);
3539 * Remove an address from the table.
3542 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr)
3544 struct bridge_rtnode *brt;
3546 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
3548 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
3551 /* TODO: add a cheaper delete operation */
3552 brt->brt_info->bri_dead = 1;
3560 * Delete routes to a speicifc member interface.
3563 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int bf)
3565 struct bridge_rtnode *brt;
3569 LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) {
3570 struct bridge_rtinfo *bri = brt->brt_info;
3572 if (bri->bri_ifp == ifp &&
3573 ((bf & IFBF_FLUSHALL) ||
3574 (bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) {
3580 if (bf & IFBF_FLUSHSYNC)
3583 bridge_rtreap_async(sc);
3588 * bridge_rtable_init:
3590 * Initialize the route table for this bridge.
3593 bridge_rtable_init(struct bridge_softc *sc)
3598 * Initialize per-cpu hash tables
3600 sc->sc_rthashs = kmalloc(sizeof(*sc->sc_rthashs) * ncpus,
3601 M_DEVBUF, M_WAITOK);
3602 for (cpu = 0; cpu < ncpus; ++cpu) {
3605 sc->sc_rthashs[cpu] =
3606 kmalloc(sizeof(struct bridge_rtnode_head) * BRIDGE_RTHASH_SIZE,
3607 M_DEVBUF, M_WAITOK);
3609 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3610 LIST_INIT(&sc->sc_rthashs[cpu][i]);
3612 sc->sc_rthash_key = karc4random();
3615 * Initialize per-cpu lists
3617 sc->sc_rtlists = kmalloc(sizeof(struct bridge_rtnode_head) * ncpus,
3618 M_DEVBUF, M_WAITOK);
3619 for (cpu = 0; cpu < ncpus; ++cpu)
3620 LIST_INIT(&sc->sc_rtlists[cpu]);
3624 * bridge_rtable_fini:
3626 * Deconstruct the route table for this bridge.
3629 bridge_rtable_fini(struct bridge_softc *sc)
3634 * Free per-cpu hash tables
3636 for (cpu = 0; cpu < ncpus; ++cpu)
3637 kfree(sc->sc_rthashs[cpu], M_DEVBUF);
3638 kfree(sc->sc_rthashs, M_DEVBUF);
3641 * Free per-cpu lists
3643 kfree(sc->sc_rtlists, M_DEVBUF);
3647 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3648 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3650 #define mix(a, b, c) \
3652 a -= b; a -= c; a ^= (c >> 13); \
3653 b -= c; b -= a; b ^= (a << 8); \
3654 c -= a; c -= b; c ^= (b >> 13); \
3655 a -= b; a -= c; a ^= (c >> 12); \
3656 b -= c; b -= a; b ^= (a << 16); \
3657 c -= a; c -= b; c ^= (b >> 5); \
3658 a -= b; a -= c; a ^= (c >> 3); \
3659 b -= c; b -= a; b ^= (a << 10); \
3660 c -= a; c -= b; c ^= (b >> 15); \
3661 } while (/*CONSTCOND*/0)
3663 static __inline uint32_t
3664 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3666 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3677 return (c & BRIDGE_RTHASH_MASK);
3683 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3687 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3688 d = ((int)a[i]) - ((int)b[i]);
3695 * bridge_rtnode_lookup:
3697 * Look up a bridge route node for the specified destination.
3699 static struct bridge_rtnode *
3700 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr)
3702 struct bridge_rtnode *brt;
3706 hash = bridge_rthash(sc, addr);
3707 LIST_FOREACH(brt, &sc->sc_rthashs[mycpuid][hash], brt_hash) {
3708 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3719 * bridge_rtnode_insert:
3721 * Insert the specified bridge node into the route table.
3722 * Caller has to make sure that rtnode does not exist.
3725 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3727 struct bridge_rtnode *lbrt;
3731 hash = bridge_rthash(sc, brt->brt_addr);
3733 lbrt = LIST_FIRST(&sc->sc_rthashs[mycpuid][hash]);
3735 LIST_INSERT_HEAD(&sc->sc_rthashs[mycpuid][hash],
3741 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3742 KASSERT(dir != 0, ("rtnode already exist\n"));
3745 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3748 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
3749 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3752 lbrt = LIST_NEXT(lbrt, brt_hash);
3753 } while (lbrt != NULL);
3755 panic("no suitable position found for rtnode\n");
3757 LIST_INSERT_HEAD(&sc->sc_rtlists[mycpuid], brt, brt_list);
3760 * Update the brtcnt.
3761 * We only need to do it once and we do it on CPU0.
3768 * bridge_rtnode_destroy:
3770 * Destroy a bridge rtnode.
3773 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3775 LIST_REMOVE(brt, brt_hash);
3776 LIST_REMOVE(brt, brt_list);
3778 if (mycpuid + 1 == ncpus) {
3779 /* Free rtinfo associated with rtnode on the last cpu */
3780 kfree(brt->brt_info, M_DEVBUF);
3782 kfree(brt, M_DEVBUF);
3785 /* Update brtcnt only on CPU0 */
3791 bridge_post_pfil(struct mbuf *m)
3793 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED)
3797 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED)
3804 * Send bridge packets through pfil if they are one of the types pfil can deal
3805 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3806 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3810 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3812 int snap, error, i, hlen;
3813 struct ether_header *eh1, eh2;
3816 u_int16_t ether_type;
3819 error = -1; /* Default error if not error == 0 */
3821 if (pfil_bridge == 0 && pfil_member == 0)
3822 return (0); /* filtering is disabled */
3824 i = min((*mp)->m_pkthdr.len, max_protohdr);
3825 if ((*mp)->m_len < i) {
3826 *mp = m_pullup(*mp, i);
3828 kprintf("%s: m_pullup failed\n", __func__);
3833 eh1 = mtod(*mp, struct ether_header *);
3834 ether_type = ntohs(eh1->ether_type);
3837 * Check for SNAP/LLC.
3839 if (ether_type < ETHERMTU) {
3840 struct llc *llc2 = (struct llc *)(eh1 + 1);
3842 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3843 llc2->llc_dsap == LLC_SNAP_LSAP &&
3844 llc2->llc_ssap == LLC_SNAP_LSAP &&
3845 llc2->llc_control == LLC_UI) {
3846 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3852 * If we're trying to filter bridge traffic, don't look at anything
3853 * other than IP and ARP traffic. If the filter doesn't understand
3854 * IPv6, don't allow IPv6 through the bridge either. This is lame
3855 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3856 * but of course we don't have an AppleTalk filter to begin with.
3857 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3860 switch (ether_type) {
3862 case ETHERTYPE_REVARP:
3863 return (0); /* Automatically pass */
3867 case ETHERTYPE_IPV6:
3873 * Check to see if the user wants to pass non-ip
3874 * packets, these will not be checked by pfil(9)
3875 * and passed unconditionally so the default is to drop.
3881 /* Strip off the Ethernet header and keep a copy. */
3882 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3883 m_adj(*mp, ETHER_HDR_LEN);
3885 /* Strip off snap header, if present */
3887 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3888 m_adj(*mp, sizeof(struct llc));
3892 * Check the IP header for alignment and errors
3894 if (dir == PFIL_IN) {
3895 switch (ether_type) {
3897 error = bridge_ip_checkbasic(mp);
3900 case ETHERTYPE_IPV6:
3901 error = bridge_ip6_checkbasic(mp);
3914 * Run the packet through pfil
3916 switch (ether_type) {
3919 * before calling the firewall, swap fields the same as
3920 * IP does. here we assume the header is contiguous
3922 ip = mtod(*mp, struct ip *);
3924 ip->ip_len = ntohs(ip->ip_len);
3925 ip->ip_off = ntohs(ip->ip_off);
3928 * Run pfil on the member interface and the bridge, both can
3929 * be skipped by clearing pfil_member or pfil_bridge.
3932 * in_if -> bridge_if -> out_if
3934 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) {
3935 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir);
3936 if (*mp == NULL || error != 0) /* filter may consume */
3938 error = bridge_post_pfil(*mp);
3943 if (pfil_member && ifp != NULL) {
3944 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir);
3945 if (*mp == NULL || error != 0) /* filter may consume */
3947 error = bridge_post_pfil(*mp);
3952 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) {
3953 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir);
3954 if (*mp == NULL || error != 0) /* filter may consume */
3956 error = bridge_post_pfil(*mp);
3961 /* check if we need to fragment the packet */
3962 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3963 i = (*mp)->m_pkthdr.len;
3964 if (i > ifp->if_mtu) {
3965 error = bridge_fragment(ifp, *mp, &eh2, snap,
3971 /* Recalculate the ip checksum and restore byte ordering */
3972 ip = mtod(*mp, struct ip *);
3973 hlen = ip->ip_hl << 2;
3974 if (hlen < sizeof(struct ip))
3976 if (hlen > (*mp)->m_len) {
3977 if ((*mp = m_pullup(*mp, hlen)) == 0)
3979 ip = mtod(*mp, struct ip *);
3983 ip->ip_len = htons(ip->ip_len);
3984 ip->ip_off = htons(ip->ip_off);
3986 if (hlen == sizeof(struct ip))
3987 ip->ip_sum = in_cksum_hdr(ip);
3989 ip->ip_sum = in_cksum(*mp, hlen);
3993 case ETHERTYPE_IPV6:
3994 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3995 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3998 if (*mp == NULL || error != 0) /* filter may consume */
4001 if (pfil_member && ifp != NULL)
4002 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
4005 if (*mp == NULL || error != 0) /* filter may consume */
4008 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
4009 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
4026 * Finally, put everything back the way it was and return
4029 M_PREPEND(*mp, sizeof(struct llc), MB_DONTWAIT);
4032 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
4035 M_PREPEND(*mp, ETHER_HDR_LEN, MB_DONTWAIT);
4038 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
4049 * Perform basic checks on header size since
4050 * pfil assumes ip_input has already processed
4051 * it for it. Cut-and-pasted from ip_input.c.
4052 * Given how simple the IPv6 version is,
4053 * does the IPv4 version really need to be
4056 * XXX Should we update ipstat here, or not?
4057 * XXX Right now we update ipstat but not
4061 bridge_ip_checkbasic(struct mbuf **mp)
4063 struct mbuf *m = *mp;
4071 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
4072 if ((m = m_copyup(m, sizeof(struct ip),
4073 (max_linkhdr + 3) & ~3)) == NULL) {
4074 /* XXXJRT new stat, please */
4075 ipstat.ips_toosmall++;
4080 #ifndef __predict_false
4081 #define __predict_false(x) x
4083 if (__predict_false(m->m_len < sizeof (struct ip))) {
4084 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
4085 ipstat.ips_toosmall++;
4089 ip = mtod(m, struct ip *);
4090 if (ip == NULL) goto bad;
4092 if (ip->ip_v != IPVERSION) {
4093 ipstat.ips_badvers++;
4096 hlen = ip->ip_hl << 2;
4097 if (hlen < sizeof(struct ip)) { /* minimum header length */
4098 ipstat.ips_badhlen++;
4101 if (hlen > m->m_len) {
4102 if ((m = m_pullup(m, hlen)) == 0) {
4103 ipstat.ips_badhlen++;
4106 ip = mtod(m, struct ip *);
4107 if (ip == NULL) goto bad;
4110 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
4111 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
4113 if (hlen == sizeof(struct ip)) {
4114 sum = in_cksum_hdr(ip);
4116 sum = in_cksum(m, hlen);
4120 ipstat.ips_badsum++;
4124 /* Retrieve the packet length. */
4125 len = ntohs(ip->ip_len);
4128 * Check for additional length bogosity
4131 ipstat.ips_badlen++;
4136 * Check that the amount of data in the buffers
4137 * is as at least much as the IP header would have us expect.
4138 * Drop packet if shorter than we expect.
4140 if (m->m_pkthdr.len < len) {
4141 ipstat.ips_tooshort++;
4145 /* Checks out, proceed */
4156 * Same as above, but for IPv6.
4157 * Cut-and-pasted from ip6_input.c.
4158 * XXX Should we update ip6stat, or not?
4161 bridge_ip6_checkbasic(struct mbuf **mp)
4163 struct mbuf *m = *mp;
4164 struct ip6_hdr *ip6;
4167 * If the IPv6 header is not aligned, slurp it up into a new
4168 * mbuf with space for link headers, in the event we forward
4169 * it. Otherwise, if it is aligned, make sure the entire base
4170 * IPv6 header is in the first mbuf of the chain.
4173 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
4174 struct ifnet *inifp = m->m_pkthdr.rcvif;
4175 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
4176 (max_linkhdr + 3) & ~3)) == NULL) {
4177 /* XXXJRT new stat, please */
4178 ip6stat.ip6s_toosmall++;
4179 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
4184 if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
4185 struct ifnet *inifp = m->m_pkthdr.rcvif;
4186 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
4187 ip6stat.ip6s_toosmall++;
4188 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
4193 ip6 = mtod(m, struct ip6_hdr *);
4195 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
4196 ip6stat.ip6s_badvers++;
4197 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
4201 /* Checks out, proceed */
4214 * Return a fragmented mbuf chain.
4217 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
4218 int snap, struct llc *llc)
4224 if (m->m_len < sizeof(struct ip) &&
4225 (m = m_pullup(m, sizeof(struct ip))) == NULL)
4227 ip = mtod(m, struct ip *);
4229 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
4234 /* walk the chain and re-add the Ethernet header */
4235 for (m0 = m; m0; m0 = m0->m_nextpkt) {
4238 M_PREPEND(m0, sizeof(struct llc), MB_DONTWAIT);
4243 bcopy(llc, mtod(m0, caddr_t),
4244 sizeof(struct llc));
4246 M_PREPEND(m0, ETHER_HDR_LEN, MB_DONTWAIT);
4251 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
4257 ipstat.ips_fragmented++;
4268 bridge_enqueue_handler(netmsg_t msg)
4270 struct netmsg_packet *nmp;
4271 struct ifnet *dst_ifp;
4276 dst_ifp = nmp->base.lmsg.u.ms_resultp;
4279 bridge_handoff(dst_ifp->if_bridge, dst_ifp, m, 1);
4283 bridge_handoff(struct bridge_softc *sc, struct ifnet *dst_ifp,
4284 struct mbuf *m, int from_us)
4292 /* We may be sending a fragment so traverse the mbuf */
4294 struct altq_pktattr pktattr;
4297 m->m_nextpkt = NULL;
4300 * If being sent from our host override ether_shost
4301 * with the bridge MAC. This is mandatory for ARP
4302 * so things don't get confused. In particular we
4303 * don't want ARPs to get associated with link interfaces
4304 * under the bridge which might or might not stay valid.
4306 * Also override ether_shost when relaying a packet out
4307 * the same interface it came in on, due to multi-homed
4308 * addresses & default routes, otherwise switches will
4309 * get very confused.
4311 * Otherwise if we are in transparent mode.
4313 if (from_us || m->m_pkthdr.rcvif == dst_ifp) {
4315 offsetof(struct ether_header, ether_shost),
4316 ETHER_ADDR_LEN, IF_LLADDR(sc->sc_ifp));
4317 } else if ((bifp->if_flags & IFF_LINK0) &&
4318 (m->m_pkthdr.fw_flags & BRIDGE_MBUF_TAGGED)) {
4320 offsetof(struct ether_header, ether_shost),
4322 m->m_pkthdr.br.ether.ether_shost);
4323 } /* else retain shost */
4325 if (ifq_is_enabled(&dst_ifp->if_snd))
4326 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr);
4328 ifq_dispatch(dst_ifp, m, &pktattr);
4333 bridge_control_dispatch(netmsg_t msg)
4335 struct netmsg_brctl *bc_msg = (struct netmsg_brctl *)msg;
4336 struct ifnet *bifp = bc_msg->bc_sc->sc_ifp;
4339 ifnet_serialize_all(bifp);
4340 error = bc_msg->bc_func(bc_msg->bc_sc, bc_msg->bc_arg);
4341 ifnet_deserialize_all(bifp);
4343 lwkt_replymsg(&bc_msg->base.lmsg, error);
4347 bridge_control(struct bridge_softc *sc, u_long cmd,
4348 bridge_ctl_t bc_func, void *bc_arg)
4350 struct ifnet *bifp = sc->sc_ifp;
4351 struct netmsg_brctl bc_msg;
4354 ASSERT_IFNET_SERIALIZED_ALL(bifp);
4356 bzero(&bc_msg, sizeof(bc_msg));
4358 netmsg_init(&bc_msg.base, NULL, &curthread->td_msgport,
4359 0, bridge_control_dispatch);
4360 bc_msg.bc_func = bc_func;
4362 bc_msg.bc_arg = bc_arg;
4364 ifnet_deserialize_all(bifp);
4365 error = lwkt_domsg(BRIDGE_CFGPORT, &bc_msg.base.lmsg, 0);
4366 ifnet_serialize_all(bifp);
4371 bridge_add_bif_handler(netmsg_t msg)
4373 struct netmsg_braddbif *amsg = (struct netmsg_braddbif *)msg;
4374 struct bridge_softc *sc;
4375 struct bridge_iflist *bif;
4377 sc = amsg->br_softc;
4379 bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK | M_ZERO);
4380 bif->bif_ifp = amsg->br_bif_ifp;
4381 bif->bif_onlist = 1;
4382 bif->bif_info = amsg->br_bif_info;
4385 * runs through bif_info
4387 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
4389 TAILQ_INSERT_HEAD(&sc->sc_iflists[mycpuid], bif, bif_next);
4391 ifnet_forwardmsg(&amsg->base.lmsg, mycpuid + 1);
4395 bridge_add_bif(struct bridge_softc *sc, struct bridge_ifinfo *bif_info,
4398 struct netmsg_braddbif amsg;
4400 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
4402 netmsg_init(&amsg.base, NULL, &curthread->td_msgport,
4403 0, bridge_add_bif_handler);
4405 amsg.br_bif_info = bif_info;
4406 amsg.br_bif_ifp = ifp;
4408 ifnet_domsg(&amsg.base.lmsg, 0);
4412 bridge_del_bif_handler(netmsg_t msg)
4414 struct netmsg_brdelbif *dmsg = (struct netmsg_brdelbif *)msg;
4415 struct bridge_softc *sc;
4416 struct bridge_iflist *bif;
4418 sc = dmsg->br_softc;
4421 * Locate the bif associated with the br_bif_info
4422 * on the current CPU
4424 bif = bridge_lookup_member_ifinfo(sc, dmsg->br_bif_info);
4425 KKASSERT(bif != NULL && bif->bif_onlist);
4427 /* Remove the bif from the current CPU's iflist */
4428 bif->bif_onlist = 0;
4429 TAILQ_REMOVE(dmsg->br_bif_list, bif, bif_next);
4431 /* Save the removed bif for later freeing */
4432 TAILQ_INSERT_HEAD(dmsg->br_bif_list, bif, bif_next);
4434 ifnet_forwardmsg(&dmsg->base.lmsg, mycpuid + 1);
4438 bridge_del_bif(struct bridge_softc *sc, struct bridge_ifinfo *bif_info,
4439 struct bridge_iflist_head *saved_bifs)
4441 struct netmsg_brdelbif dmsg;
4443 ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp);
4445 netmsg_init(&dmsg.base, NULL, &curthread->td_msgport,
4446 0, bridge_del_bif_handler);
4448 dmsg.br_bif_info = bif_info;
4449 dmsg.br_bif_list = saved_bifs;
4451 ifnet_domsg(&dmsg.base.lmsg, 0);