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 $
69 * $DragonFly: src/sys/net/bridge/if_bridge.c,v 1.28 2008/01/11 11:59:40 sephe Exp $
73 * Network interface bridge support.
77 * - Currently only supports Ethernet-like interfaces (Ethernet,
78 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
79 * to bridge other types of interfaces (FDDI-FDDI, and maybe
80 * consider heterogenous bridges).
83 #include <sys/cdefs.h>
86 #include "opt_inet6.h"
88 #include <sys/param.h>
90 #include <sys/malloc.h>
91 #include <sys/protosw.h>
92 #include <sys/systm.h>
94 #include <sys/socket.h> /* for net/if.h */
95 #include <sys/sockio.h>
96 #include <sys/ctype.h> /* string functions */
97 #include <sys/kernel.h>
98 #include <sys/random.h>
99 #include <sys/sysctl.h>
100 #include <sys/module.h>
101 #include <sys/proc.h>
102 #include <sys/lock.h>
103 #include <sys/thread.h>
104 #include <sys/thread2.h>
105 #include <sys/mpipe.h>
109 #include <net/if_dl.h>
110 #include <net/if_types.h>
111 #include <net/if_var.h>
112 #include <net/pfil.h>
113 #include <net/ifq_var.h>
114 #include <net/if_clone.h>
116 #include <netinet/in.h> /* for struct arpcom */
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
125 #include <netinet/if_ether.h> /* for struct arpcom */
126 #include <net/bridge/if_bridgevar.h>
127 #include <net/if_llc.h>
128 #include <net/netmsg2.h>
130 #include <net/route.h>
131 #include <sys/in_cksum.h>
134 * Size of the route hash table. Must be a power of two.
136 #ifndef BRIDGE_RTHASH_SIZE
137 #define BRIDGE_RTHASH_SIZE 1024
140 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
143 * Maximum number of addresses to cache.
145 #ifndef BRIDGE_RTABLE_MAX
146 #define BRIDGE_RTABLE_MAX 100
150 * Spanning tree defaults.
152 #define BSTP_DEFAULT_MAX_AGE (20 * 256)
153 #define BSTP_DEFAULT_HELLO_TIME (2 * 256)
154 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256)
155 #define BSTP_DEFAULT_HOLD_TIME (1 * 256)
156 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000
157 #define BSTP_DEFAULT_PORT_PRIORITY 0x80
158 #define BSTP_DEFAULT_PATH_COST 55
161 * Timeout (in seconds) for entries learned dynamically.
163 #ifndef BRIDGE_RTABLE_TIMEOUT
164 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
168 * Number of seconds between walks of the route list.
170 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
171 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
175 * List of capabilities to mask on the member interface.
177 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM
179 eventhandler_tag bridge_detach_cookie = NULL;
181 extern struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
182 extern int (*bridge_output_p)(struct ifnet *, struct mbuf *,
183 struct sockaddr *, struct rtentry *);
184 extern void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
186 static int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
188 static int bridge_clone_create(struct if_clone *, int);
189 static void bridge_clone_destroy(struct ifnet *);
191 static int bridge_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
192 static void bridge_mutecaps(struct bridge_iflist *, int);
193 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
194 static void bridge_init(void *);
195 static void bridge_stop(struct ifnet *);
196 static void bridge_start(struct ifnet *);
197 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
198 static int bridge_output_serialized(struct ifnet *, struct mbuf *,
199 struct sockaddr *, struct rtentry *);
201 static void bridge_forward(struct bridge_softc *, struct mbuf *m);
203 static void bridge_timer(void *);
205 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
207 static void bridge_span(struct bridge_softc *, struct mbuf *);
209 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
210 struct ifnet *, int, uint8_t);
211 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *);
212 static void bridge_rttrim(struct bridge_softc *);
213 static void bridge_rtage(struct bridge_softc *);
214 static void bridge_rtflush(struct bridge_softc *, int);
215 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
217 static int bridge_rtable_init(struct bridge_softc *);
218 static void bridge_rtable_fini(struct bridge_softc *);
220 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
221 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
223 static int bridge_rtnode_insert(struct bridge_softc *,
224 struct bridge_rtnode *);
225 static void bridge_rtnode_destroy(struct bridge_softc *,
226 struct bridge_rtnode *);
228 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
230 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
232 static void bridge_delete_member(struct bridge_softc *,
233 struct bridge_iflist *, int);
234 static void bridge_delete_span(struct bridge_softc *,
235 struct bridge_iflist *);
237 static int bridge_ioctl_add(struct bridge_softc *, void *);
238 static int bridge_ioctl_del(struct bridge_softc *, void *);
239 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
240 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
241 static int bridge_ioctl_scache(struct bridge_softc *, void *);
242 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
243 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
244 static int bridge_ioctl_rts(struct bridge_softc *, void *);
245 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
246 static int bridge_ioctl_sto(struct bridge_softc *, void *);
247 static int bridge_ioctl_gto(struct bridge_softc *, void *);
248 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
249 static int bridge_ioctl_flush(struct bridge_softc *, void *);
250 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
251 static int bridge_ioctl_spri(struct bridge_softc *, void *);
252 static int bridge_ioctl_ght(struct bridge_softc *, void *);
253 static int bridge_ioctl_sht(struct bridge_softc *, void *);
254 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
255 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
256 static int bridge_ioctl_gma(struct bridge_softc *, void *);
257 static int bridge_ioctl_sma(struct bridge_softc *, void *);
258 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
259 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
260 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
261 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
262 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
264 static int bridge_ip_checkbasic(struct mbuf **mp);
266 static int bridge_ip6_checkbasic(struct mbuf **mp);
268 static int bridge_fragment(struct ifnet *, struct mbuf *,
269 struct ether_header *, int, struct llc *);
270 static void bridge_enqueue_internal(struct ifnet *, struct mbuf *m,
272 static void bridge_enqueue_handler(struct netmsg *);
273 static void bridge_pfil_enqueue_handler(struct netmsg *);
274 static void bridge_pfil_enqueue(struct ifnet *, struct mbuf *, int);
275 static void bridge_handoff_notags(struct ifnet *, struct mbuf *);
276 static void bridge_handoff(struct ifnet *, struct mbuf *);
278 SYSCTL_DECL(_net_link);
279 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
281 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
282 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
283 static int pfil_member = 1; /* run pfil hooks on the member interface */
284 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
285 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
286 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
287 &pfil_bridge, 0, "Packet filter on the bridge interface");
288 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
289 &pfil_member, 0, "Packet filter on the member interface");
291 struct bridge_control {
292 int (*bc_func)(struct bridge_softc *, void *);
297 #define BC_F_COPYIN 0x01 /* copy arguments in */
298 #define BC_F_COPYOUT 0x02 /* copy arguments out */
299 #define BC_F_SUSER 0x04 /* do super-user check */
301 const struct bridge_control bridge_control_table[] = {
302 { bridge_ioctl_add, sizeof(struct ifbreq),
303 BC_F_COPYIN|BC_F_SUSER },
304 { bridge_ioctl_del, sizeof(struct ifbreq),
305 BC_F_COPYIN|BC_F_SUSER },
307 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
308 BC_F_COPYIN|BC_F_COPYOUT },
309 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
310 BC_F_COPYIN|BC_F_SUSER },
312 { bridge_ioctl_scache, sizeof(struct ifbrparam),
313 BC_F_COPYIN|BC_F_SUSER },
314 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
317 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
318 BC_F_COPYIN|BC_F_COPYOUT },
319 { bridge_ioctl_rts, sizeof(struct ifbaconf),
320 BC_F_COPYIN|BC_F_COPYOUT },
322 { bridge_ioctl_saddr, sizeof(struct ifbareq),
323 BC_F_COPYIN|BC_F_SUSER },
325 { bridge_ioctl_sto, sizeof(struct ifbrparam),
326 BC_F_COPYIN|BC_F_SUSER },
327 { bridge_ioctl_gto, sizeof(struct ifbrparam),
330 { bridge_ioctl_daddr, sizeof(struct ifbareq),
331 BC_F_COPYIN|BC_F_SUSER },
333 { bridge_ioctl_flush, sizeof(struct ifbreq),
334 BC_F_COPYIN|BC_F_SUSER },
336 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
338 { bridge_ioctl_spri, sizeof(struct ifbrparam),
339 BC_F_COPYIN|BC_F_SUSER },
341 { bridge_ioctl_ght, sizeof(struct ifbrparam),
343 { bridge_ioctl_sht, sizeof(struct ifbrparam),
344 BC_F_COPYIN|BC_F_SUSER },
346 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
348 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
349 BC_F_COPYIN|BC_F_SUSER },
351 { bridge_ioctl_gma, sizeof(struct ifbrparam),
353 { bridge_ioctl_sma, sizeof(struct ifbrparam),
354 BC_F_COPYIN|BC_F_SUSER },
356 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
357 BC_F_COPYIN|BC_F_SUSER },
359 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
360 BC_F_COPYIN|BC_F_SUSER },
362 { bridge_ioctl_addspan, sizeof(struct ifbreq),
363 BC_F_COPYIN|BC_F_SUSER },
364 { bridge_ioctl_delspan, sizeof(struct ifbreq),
365 BC_F_COPYIN|BC_F_SUSER },
367 const int bridge_control_table_size =
368 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
370 LIST_HEAD(, bridge_softc) bridge_list;
372 struct if_clone bridge_cloner = IF_CLONE_INITIALIZER("bridge",
374 bridge_clone_destroy, 0, IF_MAXUNIT);
377 bridge_modevent(module_t mod, int type, void *data)
381 LIST_INIT(&bridge_list);
382 if_clone_attach(&bridge_cloner);
383 bridge_input_p = bridge_input;
384 bridge_output_p = bridge_output_serialized;
385 bridge_detach_cookie = EVENTHANDLER_REGISTER(
386 ifnet_detach_event, bridge_ifdetach, NULL,
387 EVENTHANDLER_PRI_ANY);
389 bstp_linkstate_p = bstp_linkstate;
393 if (!LIST_EMPTY(&bridge_list))
395 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
396 bridge_detach_cookie);
397 if_clone_detach(&bridge_cloner);
398 bridge_input_p = NULL;
399 bridge_output_p = NULL;
401 bstp_linkstate_p = NULL;
410 static moduledata_t bridge_mod = {
416 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
420 * bridge_clone_create:
422 * Create a new bridge instance.
425 bridge_clone_create(struct if_clone *ifc, int unit)
427 struct bridge_softc *sc;
431 sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
432 ifp = sc->sc_ifp = &sc->sc_if;
434 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
435 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
436 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
437 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME;
438 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY;
439 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
440 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME;
442 /* Initialize our routing table. */
443 bridge_rtable_init(sc);
445 callout_init(&sc->sc_brcallout);
446 callout_init(&sc->sc_bstpcallout);
448 LIST_INIT(&sc->sc_iflist);
449 LIST_INIT(&sc->sc_spanlist);
452 if_initname(ifp, ifc->ifc_name, unit);
453 ifp->if_mtu = ETHERMTU;
454 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST;
455 ifp->if_ioctl = bridge_ioctl;
456 ifp->if_start = bridge_start;
457 ifp->if_init = bridge_init;
458 ifp->if_type = IFT_BRIDGE;
459 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
460 ifp->if_snd.ifq_maxlen = ifqmaxlen;
461 ifq_set_ready(&ifp->if_snd);
462 ifp->if_hdrlen = ETHER_HDR_LEN;
465 * Generate a random ethernet address and use the private AC:DE:48
469 int rnd = karc4random();
470 bcopy(&rnd, &eaddr[0], 4); /* ETHER_ADDR_LEN == 6 */
472 bcopy(&rnd, &eaddr[2], 4); /* ETHER_ADDR_LEN == 6 */
474 eaddr[0] &= ~1; /* clear multicast bit */
475 eaddr[0] |= 2; /* set the LAA bit */
477 ether_ifattach(ifp, eaddr, NULL);
478 /* Now undo some of the damage... */
479 ifp->if_baudrate = 0;
480 ifp->if_type = IFT_BRIDGE;
483 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
490 * bridge_clone_destroy:
492 * Destroy a bridge instance.
495 bridge_clone_destroy(struct ifnet *ifp)
497 struct bridge_softc *sc = ifp->if_softc;
498 struct bridge_iflist *bif;
500 lwkt_serialize_enter(ifp->if_serializer);
503 ifp->if_flags &= ~IFF_UP;
505 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
506 bridge_delete_member(sc, bif, 0);
508 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
509 bridge_delete_span(sc, bif);
512 callout_stop(&sc->sc_brcallout);
513 callout_stop(&sc->sc_bstpcallout);
515 lwkt_serialize_exit(ifp->if_serializer);
518 LIST_REMOVE(sc, sc_list);
523 /* Tear down the routing table. */
524 bridge_rtable_fini(sc);
532 * Handle a control request from the operator.
535 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
537 struct bridge_softc *sc = ifp->if_softc;
539 struct ifbreq ifbreq;
540 struct ifbifconf ifbifconf;
541 struct ifbareq ifbareq;
542 struct ifbaconf ifbaconf;
543 struct ifbrparam ifbrparam;
545 struct ifdrv *ifd = (struct ifdrv *) data;
546 const struct bridge_control *bc;
549 ASSERT_SERIALIZED(ifp->if_serializer);
558 if (ifd->ifd_cmd >= bridge_control_table_size) {
562 bc = &bridge_control_table[ifd->ifd_cmd];
564 if (cmd == SIOCGDRVSPEC &&
565 (bc->bc_flags & BC_F_COPYOUT) == 0) {
568 } else if (cmd == SIOCSDRVSPEC &&
569 (bc->bc_flags & BC_F_COPYOUT) != 0) {
574 if (bc->bc_flags & BC_F_SUSER) {
575 error = suser_cred(cr, NULL_CRED_OKAY);
580 if (ifd->ifd_len != bc->bc_argsize ||
581 ifd->ifd_len > sizeof(args)) {
586 memset(&args, 0, sizeof(args));
587 if (bc->bc_flags & BC_F_COPYIN) {
588 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
593 error = bc->bc_func(sc, &args);
597 if (bc->bc_flags & BC_F_COPYOUT)
598 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
602 if (!(ifp->if_flags & IFF_UP) &&
603 (ifp->if_flags & IFF_RUNNING)) {
605 * If interface is marked down and it is running,
609 } else if ((ifp->if_flags & IFF_UP) &&
610 !(ifp->if_flags & IFF_RUNNING)) {
612 * If interface is marked up and it is stopped, then
620 /* Do not allow the MTU to be changed on the bridge */
625 error = ether_ioctl(ifp, cmd, data);
634 * Clear or restore unwanted capabilities on the member interface
637 bridge_mutecaps(struct bridge_iflist *bif, int mute)
639 struct ifnet *ifp = bif->bif_ifp;
643 if (ifp->if_ioctl == NULL)
646 bzero(&ifr, sizeof(ifr));
647 ifr.ifr_reqcap = ifp->if_capenable;
650 /* mask off and save capabilities */
651 bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK;
652 if (bif->bif_mutecap != 0)
653 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK;
655 /* restore muted capabilities */
656 ifr.ifr_reqcap |= bif->bif_mutecap;
658 if (bif->bif_mutecap != 0) {
659 lwkt_serialize_enter(ifp->if_serializer);
660 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr, NULL);
661 lwkt_serialize_exit(ifp->if_serializer);
666 * bridge_lookup_member:
668 * Lookup a bridge member interface.
670 static struct bridge_iflist *
671 bridge_lookup_member(struct bridge_softc *sc, const char *name)
673 struct bridge_iflist *bif;
676 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
678 if (strcmp(ifp->if_xname, name) == 0)
686 * bridge_lookup_member_if:
688 * Lookup a bridge member interface by ifnet*.
690 static struct bridge_iflist *
691 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
693 struct bridge_iflist *bif;
695 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
696 if (bif->bif_ifp == member_ifp)
704 * bridge_delete_member:
706 * Delete the specified member interface.
709 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
712 struct ifnet *ifs = bif->bif_ifp;
715 switch (ifs->if_type) {
719 * Take the interface out of promiscuous mode.
721 (void) ifpromisc(ifs, 0);
722 bridge_mutecaps(bif, 0);
730 panic("bridge_delete_member: impossible");
736 ifs->if_bridge = NULL;
737 LIST_REMOVE(bif, bif_next);
739 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
741 kfree(bif, M_DEVBUF);
743 if (sc->sc_ifp->if_flags & IFF_RUNNING)
744 bstp_initialization(sc);
748 * bridge_delete_span:
750 * Delete the specified span interface.
753 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
755 KASSERT(bif->bif_ifp->if_bridge == NULL,
756 ("%s: not a span interface", __func__));
758 LIST_REMOVE(bif, bif_next);
759 kfree(bif, M_DEVBUF);
763 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
765 struct ifbreq *req = arg;
766 struct bridge_iflist *bif = NULL;
770 ifs = ifunit(req->ifbr_ifsname);
774 /* If it's in the span list, it can't be a member. */
775 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
776 if (ifs == bif->bif_ifp)
779 /* Allow the first Ethernet member to define the MTU */
780 if (ifs->if_type != IFT_GIF) {
781 if (LIST_EMPTY(&sc->sc_iflist))
782 sc->sc_ifp->if_mtu = ifs->if_mtu;
783 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
784 if_printf(sc->sc_ifp, "invalid MTU for %s\n",
790 if (ifs->if_bridge == sc)
793 if (ifs->if_bridge != NULL)
796 bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK|M_ZERO);
798 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
799 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY;
800 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST;
802 switch (ifs->if_type) {
806 * Place the interface into promiscuous mode.
808 error = ifpromisc(ifs, 1);
812 bridge_mutecaps(bif, 1);
815 case IFT_GIF: /* :^) */
825 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
827 if (sc->sc_ifp->if_flags & IFF_RUNNING)
828 bstp_initialization(sc);
835 kfree(bif, M_DEVBUF);
841 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
843 struct ifbreq *req = arg;
844 struct bridge_iflist *bif;
846 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
850 bridge_delete_member(sc, bif, 0);
856 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
858 struct ifbreq *req = arg;
859 struct bridge_iflist *bif;
861 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
865 req->ifbr_ifsflags = bif->bif_flags;
866 req->ifbr_state = bif->bif_state;
867 req->ifbr_priority = bif->bif_priority;
868 req->ifbr_path_cost = bif->bif_path_cost;
869 req->ifbr_portno = bif->bif_ifp->if_index & 0xff;
875 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
877 struct ifbreq *req = arg;
878 struct bridge_iflist *bif;
880 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
884 if (req->ifbr_ifsflags & IFBIF_SPAN)
885 /* SPAN is readonly */
888 if (req->ifbr_ifsflags & IFBIF_STP) {
889 switch (bif->bif_ifp->if_type) {
891 /* These can do spanning tree. */
895 /* Nothing else can. */
900 bif->bif_flags = req->ifbr_ifsflags;
902 if (sc->sc_ifp->if_flags & IFF_RUNNING)
903 bstp_initialization(sc);
909 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
911 struct ifbrparam *param = arg;
913 sc->sc_brtmax = param->ifbrp_csize;
920 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
922 struct ifbrparam *param = arg;
924 param->ifbrp_csize = sc->sc_brtmax;
930 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
932 struct ifbifconf *bifc = arg;
933 struct bridge_iflist *bif;
935 int count, len, error = 0;
938 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
940 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
943 if (bifc->ifbic_len == 0) {
944 bifc->ifbic_len = sizeof(breq) * count;
949 len = bifc->ifbic_len;
950 memset(&breq, 0, sizeof breq);
951 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
952 if (len < sizeof(breq))
955 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
956 sizeof(breq.ifbr_ifsname));
957 breq.ifbr_ifsflags = bif->bif_flags;
958 breq.ifbr_state = bif->bif_state;
959 breq.ifbr_priority = bif->bif_priority;
960 breq.ifbr_path_cost = bif->bif_path_cost;
961 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
962 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
968 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
969 if (len < sizeof(breq))
972 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
973 sizeof(breq.ifbr_ifsname));
974 breq.ifbr_ifsflags = bif->bif_flags;
975 breq.ifbr_state = bif->bif_state;
976 breq.ifbr_priority = bif->bif_priority;
977 breq.ifbr_path_cost = bif->bif_path_cost;
978 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
979 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
986 bifc->ifbic_len = sizeof(breq) * count;
991 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
993 struct ifbaconf *bac = arg;
994 struct bridge_rtnode *brt;
995 struct ifbareq bareq;
996 int count = 0, error = 0, len;
998 if (bac->ifbac_len == 0)
1001 len = bac->ifbac_len;
1002 memset(&bareq, 0, sizeof(bareq));
1003 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1004 if (len < sizeof(bareq))
1006 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1007 sizeof(bareq.ifba_ifsname));
1008 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1009 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1010 time_second < brt->brt_expire)
1011 bareq.ifba_expire = brt->brt_expire - time_second;
1013 bareq.ifba_expire = 0;
1014 bareq.ifba_flags = brt->brt_flags;
1016 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq));
1020 len -= sizeof(bareq);
1023 bac->ifbac_len = sizeof(bareq) * count;
1028 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1030 struct ifbareq *req = arg;
1031 struct bridge_iflist *bif;
1034 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1038 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1,
1045 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1047 struct ifbrparam *param = arg;
1049 sc->sc_brttimeout = param->ifbrp_ctime;
1055 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1057 struct ifbrparam *param = arg;
1059 param->ifbrp_ctime = sc->sc_brttimeout;
1065 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1067 struct ifbareq *req = arg;
1069 return (bridge_rtdaddr(sc, req->ifba_dst));
1073 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1075 struct ifbreq *req = arg;
1077 bridge_rtflush(sc, req->ifbr_ifsflags);
1083 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1085 struct ifbrparam *param = arg;
1087 param->ifbrp_prio = sc->sc_bridge_priority;
1093 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1095 struct ifbrparam *param = arg;
1097 sc->sc_bridge_priority = param->ifbrp_prio;
1099 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1100 bstp_initialization(sc);
1106 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1108 struct ifbrparam *param = arg;
1110 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8;
1116 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1118 struct ifbrparam *param = arg;
1120 if (param->ifbrp_hellotime == 0)
1122 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8;
1124 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1125 bstp_initialization(sc);
1131 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1133 struct ifbrparam *param = arg;
1135 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8;
1141 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1143 struct ifbrparam *param = arg;
1145 if (param->ifbrp_fwddelay == 0)
1147 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8;
1149 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1150 bstp_initialization(sc);
1156 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1158 struct ifbrparam *param = arg;
1160 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8;
1166 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1168 struct ifbrparam *param = arg;
1170 if (param->ifbrp_maxage == 0)
1172 sc->sc_bridge_max_age = param->ifbrp_maxage << 8;
1174 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1175 bstp_initialization(sc);
1181 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1183 struct ifbreq *req = arg;
1184 struct bridge_iflist *bif;
1186 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1190 bif->bif_priority = req->ifbr_priority;
1192 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1193 bstp_initialization(sc);
1199 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1201 struct ifbreq *req = arg;
1202 struct bridge_iflist *bif;
1204 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1208 bif->bif_path_cost = req->ifbr_path_cost;
1210 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1211 bstp_initialization(sc);
1217 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1219 struct ifbreq *req = arg;
1220 struct bridge_iflist *bif = NULL;
1223 ifs = ifunit(req->ifbr_ifsname);
1227 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1228 if (ifs == bif->bif_ifp)
1231 if (ifs->if_bridge != NULL)
1234 switch (ifs->if_type) {
1243 bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK|M_ZERO);
1246 bif->bif_flags = IFBIF_SPAN;
1248 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1254 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1256 struct ifbreq *req = arg;
1257 struct bridge_iflist *bif;
1260 ifs = ifunit(req->ifbr_ifsname);
1264 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1265 if (ifs == bif->bif_ifp)
1271 bridge_delete_span(sc, bif);
1279 * Detach an interface from a bridge. Called when a member
1280 * interface is detaching.
1283 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1285 struct bridge_softc *sc = ifp->if_bridge;
1286 struct bridge_iflist *bif;
1288 /* Check if the interface is a bridge member */
1290 lwkt_serialize_enter(ifp->if_serializer);
1292 bif = bridge_lookup_member_if(sc, ifp);
1294 bridge_delete_member(sc, bif, 1);
1296 lwkt_serialize_exit(ifp->if_serializer);
1300 /* Check if the interface is a span port */
1301 LIST_FOREACH(sc, &bridge_list, sc_list) {
1302 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1303 if (ifp == bif->bif_ifp) {
1304 bridge_delete_span(sc, bif);
1313 * Initialize a bridge interface.
1316 bridge_init(void *xsc)
1318 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1319 struct ifnet *ifp = sc->sc_ifp;
1321 ASSERT_SERIALIZED(ifp->if_serializer);
1323 if (ifp->if_flags & IFF_RUNNING)
1326 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1329 ifp->if_flags |= IFF_RUNNING;
1330 bstp_initialization(sc);
1337 * Stop the bridge interface.
1340 bridge_stop(struct ifnet *ifp)
1342 struct bridge_softc *sc = ifp->if_softc;
1344 ASSERT_SERIALIZED(ifp->if_serializer);
1346 if ((ifp->if_flags & IFF_RUNNING) == 0)
1349 callout_stop(&sc->sc_brcallout);
1352 bridge_rtflush(sc, IFBF_FLUSHDYN);
1354 ifp->if_flags &= ~IFF_RUNNING;
1358 bridge_enqueue_internal(struct ifnet *dst_ifp, struct mbuf *m,
1359 netisr_fn_t handler)
1361 struct netmsg_packet *nmp;
1363 int cpu = mycpu->gd_cpuid;
1365 while (m->m_type == MT_TAG) {
1366 /* XXX see ether_output_frame for full rules check */
1370 nmp = &m->m_hdr.mh_netmsg;
1371 netmsg_init(&nmp->nm_netmsg, &netisr_apanic_rport, 0, handler);
1373 nmp->nm_netmsg.nm_lmsg.u.ms_resultp = dst_ifp;
1375 port = cpu_portfn(cpu);
1376 lwkt_sendmsg(port, &nmp->nm_netmsg.nm_lmsg);
1380 bridge_pfil_enqueue(struct ifnet *dst_ifp, struct mbuf *m,
1383 netisr_fn_t handler;
1385 if (runfilt && (inet_pfil_hook.ph_hashooks > 0
1387 || inet6_pfil_hook.ph_hashooks > 0
1390 handler = bridge_pfil_enqueue_handler;
1392 handler = bridge_enqueue_handler;
1394 bridge_enqueue_internal(dst_ifp, m, handler);
1400 * Enqueue a packet on a bridge member interface.
1404 bridge_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
1406 bridge_enqueue_internal(dst_ifp, m, bridge_enqueue_handler);
1410 * bridge_output_serialized:
1412 * Send output from a bridge member interface. This
1413 * performs the bridging function for locally originated
1416 * The mbuf has the Ethernet header already attached. We must
1417 * enqueue or free the mbuf before returning.
1420 bridge_output_serialized(struct ifnet *ifp, struct mbuf *m,
1421 struct sockaddr *sa, struct rtentry *rt)
1423 struct ether_header *eh;
1424 struct ifnet *dst_if;
1425 struct bridge_softc *sc;
1427 sc = ifp->if_bridge;
1429 ASSERT_SERIALIZED(ifp->if_serializer);
1431 if (m->m_len < ETHER_HDR_LEN) {
1432 m = m_pullup(m, ETHER_HDR_LEN);
1438 * Serialize our bridge interface. We have to get rid of the
1439 * originating interface lock to avoid a deadlock.
1441 lwkt_serialize_exit(ifp->if_serializer);
1442 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1444 eh = mtod(m, struct ether_header *);
1447 * If bridge is down, but the original output interface is up,
1448 * go ahead and send out that interface. Otherwise, the packet
1451 if ((sc->sc_ifp->if_flags & IFF_RUNNING) == 0) {
1457 * If the packet is a multicast, or we don't know a better way to
1458 * get there, send to all interfaces.
1460 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1463 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1464 if (dst_if == NULL) {
1465 struct bridge_iflist *bif;
1471 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1472 dst_if = bif->bif_ifp;
1473 if ((dst_if->if_flags & IFF_RUNNING) == 0)
1477 * If this is not the original output interface,
1478 * and the interface is participating in spanning
1479 * tree, make sure the port is in a state that
1480 * allows forwarding.
1482 if (dst_if != ifp &&
1483 (bif->bif_flags & IFBIF_STP) != 0) {
1484 switch (bif->bif_state) {
1485 case BSTP_IFSTATE_BLOCKING:
1486 case BSTP_IFSTATE_LISTENING:
1487 case BSTP_IFSTATE_DISABLED:
1492 if (LIST_NEXT(bif, bif_next) == NULL) {
1496 mc = m_copypacket(m, MB_DONTWAIT);
1498 sc->sc_ifp->if_oerrors++;
1502 bridge_enqueue(dst_if, mc);
1506 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1512 * XXX Spanning tree consideration here?
1516 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1517 if ((dst_if->if_flags & IFF_RUNNING) == 0) {
1520 bridge_enqueue(dst_if, m);
1523 lwkt_serialize_enter(ifp->if_serializer);
1530 * Start output on a bridge.
1534 bridge_start(struct ifnet *ifp)
1536 struct bridge_softc *sc = ifp->if_softc;
1538 ASSERT_SERIALIZED(ifp->if_serializer);
1540 ifp->if_flags |= IFF_OACTIVE;
1542 struct ifnet *dst_if = NULL;
1543 struct ether_header *eh;
1546 m = ifq_dequeue(&ifp->if_snd, NULL);
1550 if (m->m_len < sizeof(*eh)) {
1551 m = m_pullup(m, sizeof(*eh));
1557 eh = mtod(m, struct ether_header *);
1562 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0)
1563 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1566 bridge_broadcast(sc, ifp, m, 0);
1568 bridge_enqueue(dst_if, m);
1570 ifp->if_flags &= ~IFF_OACTIVE;
1576 * The forwarding function of the bridge.
1579 bridge_forward(struct bridge_softc *sc, struct mbuf *m)
1581 struct bridge_iflist *bif;
1582 struct ifnet *src_if, *dst_if, *ifp;
1583 struct ether_header *eh;
1585 src_if = m->m_pkthdr.rcvif;
1588 ASSERT_SERIALIZED(ifp->if_serializer);
1591 ifp->if_ibytes += m->m_pkthdr.len;
1594 * Look up the bridge_iflist.
1596 bif = bridge_lookup_member_if(sc, src_if);
1598 /* Interface is not a bridge member (anymore?) */
1603 if (bif->bif_flags & IFBIF_STP) {
1604 switch (bif->bif_state) {
1605 case BSTP_IFSTATE_BLOCKING:
1606 case BSTP_IFSTATE_LISTENING:
1607 case BSTP_IFSTATE_DISABLED:
1613 eh = mtod(m, struct ether_header *);
1616 * If the interface is learning, and the source
1617 * address is valid and not multicast, record
1620 if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
1621 ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
1622 (eh->ether_shost[0] == 0 &&
1623 eh->ether_shost[1] == 0 &&
1624 eh->ether_shost[2] == 0 &&
1625 eh->ether_shost[3] == 0 &&
1626 eh->ether_shost[4] == 0 &&
1627 eh->ether_shost[5] == 0) == 0) {
1628 bridge_rtupdate(sc, eh->ether_shost, src_if, 0, IFBAF_DYNAMIC);
1631 if ((bif->bif_flags & IFBIF_STP) != 0 &&
1632 bif->bif_state == BSTP_IFSTATE_LEARNING) {
1638 * At this point, the port either doesn't participate
1639 * in spanning tree or it is in the forwarding state.
1643 * If the packet is unicast, destined for someone on
1644 * "this" side of the bridge, drop it.
1646 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
1647 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1648 if (src_if == dst_if) {
1653 /* ...forward it to all interfaces. */
1654 sc->sc_ifp->if_imcasts++;
1658 if (dst_if == NULL) {
1659 bridge_broadcast(sc, src_if, m, 1);
1664 * At this point, we're dealing with a unicast frame
1665 * going to a different interface.
1667 if ((dst_if->if_flags & IFF_RUNNING) == 0) {
1671 bif = bridge_lookup_member_if(sc, dst_if);
1673 /* Not a member of the bridge (anymore?) */
1678 if (bif->bif_flags & IFBIF_STP) {
1679 switch (bif->bif_state) {
1680 case BSTP_IFSTATE_DISABLED:
1681 case BSTP_IFSTATE_BLOCKING:
1687 lwkt_serialize_exit(ifp->if_serializer);
1689 /* run the packet filter */
1690 if (inet_pfil_hook.ph_hashooks > 0
1692 || inet6_pfil_hook.ph_hashooks > 0
1695 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
1700 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
1705 bridge_handoff(dst_if, m);
1708 * ifp's serializer was held on entry and is expected to be held
1712 lwkt_serialize_enter(ifp->if_serializer);
1718 * Receive input from a member interface. Queue the packet for
1719 * bridging if it is not for us.
1721 static struct mbuf *
1722 bridge_input(struct ifnet *ifp, struct mbuf *m)
1724 struct bridge_softc *sc = ifp->if_bridge;
1725 struct bridge_iflist *bif;
1726 struct ifnet *bifp, *new_ifp;
1727 struct ether_header *eh;
1728 struct mbuf *mc, *mc2;
1733 lwkt_serialize_enter(bifp->if_serializer);
1735 if ((bifp->if_flags & IFF_RUNNING) == 0)
1739 * Implement support for bridge monitoring. If this flag has been
1740 * set on this interface, discard the packet once we push it through
1741 * the bpf(4) machinery, but before we do, increment the byte and
1742 * packet counters associated with this interface.
1744 if ((bifp->if_flags & IFF_MONITOR) != 0) {
1745 m->m_pkthdr.rcvif = bifp;
1747 bifp->if_ipackets++;
1748 bifp->if_ibytes += m->m_pkthdr.len;
1754 eh = mtod(m, struct ether_header *);
1756 m->m_flags &= ~M_PROTO1; /* XXX Hack - loop prevention */
1758 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
1760 * If the packet is for us, set the packets source as the
1761 * bridge, and return the packet back to ifnet.if_input for
1764 KASSERT(bifp->if_bridge == NULL,
1765 ("loop created in bridge_input"));
1771 * Tap all packets arriving on the bridge, no matter if
1772 * they are local destinations or not. In is in.
1776 bif = bridge_lookup_member_if(sc, ifp);
1782 if (m->m_flags & (M_BCAST | M_MCAST)) {
1783 /* Tap off 802.1D packets; they do not get forwarded. */
1784 if (memcmp(eh->ether_dhost, bstp_etheraddr,
1785 ETHER_ADDR_LEN) == 0) {
1786 m = bstp_input(ifp, m);
1788 ("attempt to deliver 802.1D packet\n"));
1792 if (bif->bif_flags & IFBIF_STP) {
1793 switch (bif->bif_state) {
1794 case BSTP_IFSTATE_BLOCKING:
1795 case BSTP_IFSTATE_LISTENING:
1796 case BSTP_IFSTATE_DISABLED:
1802 * Make a deep copy of the packet and enqueue the copy
1803 * for bridge processing; return the original packet for
1806 mc = m_dup(m, MB_DONTWAIT);
1810 bridge_forward(sc, mc);
1813 * Reinject the mbuf as arriving on the bridge so we have a
1814 * chance at claiming multicast packets. We can not loop back
1815 * here from ether_input as a bridge is never a member of a
1818 KASSERT(bifp->if_bridge == NULL,
1819 ("loop created in bridge_input"));
1820 mc2 = m_dup(m, MB_DONTWAIT);
1823 /* Keep the layer3 header aligned */
1824 int i = min(mc2->m_pkthdr.len, max_protohdr);
1825 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
1829 mc2->m_pkthdr.rcvif = bifp;
1830 bifp->if_ipackets++;
1831 bifp->if_input(bifp, mc2);
1834 /* Return the original packet for local processing. */
1838 if (bif->bif_flags & IFBIF_STP) {
1839 switch (bif->bif_state) {
1840 case BSTP_IFSTATE_BLOCKING:
1841 case BSTP_IFSTATE_LISTENING:
1842 case BSTP_IFSTATE_DISABLED:
1848 * Unicast. Make sure it's not for us.
1850 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1851 if (bif->bif_ifp->if_type != IFT_ETHER)
1854 /* It is destined for us. */
1855 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost,
1856 ETHER_ADDR_LEN) == 0) {
1857 if (bif->bif_flags & IFBIF_LEARNING) {
1859 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC);
1862 if (bif->bif_ifp != ifp) {
1863 /* XXX loop prevention */
1864 m->m_flags |= M_PROTO1;
1865 new_ifp = bif->bif_ifp;
1870 /* We just received a packet that we sent out. */
1871 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost,
1872 ETHER_ADDR_LEN) == 0) {
1879 /* Perform the bridge forwarding function. */
1880 bridge_forward(sc, m);
1883 lwkt_serialize_exit(bifp->if_serializer);
1885 if (new_ifp != NULL) {
1886 lwkt_serialize_enter(new_ifp->if_serializer);
1888 m->m_pkthdr.rcvif = new_ifp;
1889 new_ifp->if_ipackets++;
1890 new_ifp->if_input(new_ifp, m);
1893 lwkt_serialize_exit(new_ifp->if_serializer);
1901 * Send a frame to all interfaces that are members of
1902 * the bridge, except for the one on which the packet
1906 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
1907 struct mbuf *m, int runfilt)
1909 struct bridge_iflist *bif;
1911 struct ifnet *dst_if, *bifp;
1916 ASSERT_SERIALIZED(bifp->if_serializer);
1918 /* run the packet filter */
1919 if (runfilt && (inet_pfil_hook.ph_hashooks > 0
1921 || inet6_pfil_hook.ph_hashooks > 0
1924 lwkt_serialize_exit(bifp->if_serializer);
1926 /* Filter on the bridge interface before broadcasting */
1928 if (bridge_pfil(&m, bifp, src_if, PFIL_IN) != 0)
1933 if (bridge_pfil(&m, bifp, NULL, PFIL_OUT) != 0)
1936 lwkt_serialize_enter(bifp->if_serializer);
1941 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1942 dst_if = bif->bif_ifp;
1943 if (dst_if == src_if)
1946 if (bif->bif_flags & IFBIF_STP) {
1947 switch (bif->bif_state) {
1948 case BSTP_IFSTATE_BLOCKING:
1949 case BSTP_IFSTATE_DISABLED:
1954 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 &&
1955 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
1958 if ((dst_if->if_flags & IFF_RUNNING) == 0)
1961 if (LIST_NEXT(bif, bif_next) == NULL) {
1965 mc = m_copypacket(m, MB_DONTWAIT);
1967 sc->sc_ifp->if_oerrors++;
1971 bridge_pfil_enqueue(dst_if, mc, runfilt);
1980 * Duplicate a packet out one or more interfaces that are in span mode,
1981 * the original mbuf is unmodified.
1984 bridge_span(struct bridge_softc *sc, struct mbuf *m)
1986 struct bridge_iflist *bif;
1987 struct ifnet *dst_if;
1990 if (LIST_EMPTY(&sc->sc_spanlist))
1993 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1994 dst_if = bif->bif_ifp;
1996 if ((dst_if->if_flags & IFF_RUNNING) == 0)
1999 mc = m_copypacket(m, MB_DONTWAIT);
2001 sc->sc_ifp->if_oerrors++;
2005 bridge_enqueue(dst_if, mc);
2012 * Add a bridge routing entry.
2013 * Can be called from interrupt context.
2016 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
2017 struct ifnet *dst_if, int setflags, uint8_t flags)
2019 struct bridge_rtnode *brt;
2023 * A route for this destination might already exist. If so,
2024 * update it, otherwise create a new one.
2026 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) {
2027 if (sc->sc_brtcnt >= sc->sc_brtmax)
2031 * Allocate a new bridge forwarding node, and
2032 * initialize the expiration time and Ethernet
2035 brt = kmalloc(sizeof(struct bridge_rtnode), M_DEVBUF,
2036 M_INTNOWAIT|M_ZERO);
2040 brt->brt_flags = IFBAF_DYNAMIC;
2041 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2043 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2044 kfree(brt, M_DEVBUF);
2049 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2050 brt->brt_ifp = dst_if;
2051 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2052 brt->brt_expire = time_second + sc->sc_brttimeout;
2054 brt->brt_flags = flags;
2062 * Lookup the destination interface for an address.
2064 static struct ifnet *
2065 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr)
2067 struct bridge_rtnode *brt;
2069 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
2072 return (brt->brt_ifp);
2078 * Trim the routine table so that we have a number
2079 * of routing entries less than or equal to the
2083 bridge_rttrim(struct bridge_softc *sc)
2085 struct bridge_rtnode *brt, *nbrt;
2087 /* Make sure we actually need to do this. */
2088 if (sc->sc_brtcnt <= sc->sc_brtmax)
2091 /* Force an aging cycle; this might trim enough addresses. */
2093 if (sc->sc_brtcnt <= sc->sc_brtmax)
2096 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2097 nbrt = LIST_NEXT(brt, brt_list);
2098 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2099 bridge_rtnode_destroy(sc, brt);
2100 if (sc->sc_brtcnt <= sc->sc_brtmax)
2109 * Aging timer for the bridge.
2112 bridge_timer(void *arg)
2114 struct bridge_softc *sc = arg;
2116 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
2120 if (sc->sc_ifp->if_flags & IFF_RUNNING)
2121 callout_reset(&sc->sc_brcallout,
2122 bridge_rtable_prune_period * hz, bridge_timer, sc);
2124 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
2130 * Perform an aging cycle.
2133 bridge_rtage(struct bridge_softc *sc)
2135 struct bridge_rtnode *brt, *nbrt;
2137 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2138 nbrt = LIST_NEXT(brt, brt_list);
2139 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2140 if (time_second >= brt->brt_expire)
2141 bridge_rtnode_destroy(sc, brt);
2149 * Remove all dynamic addresses from the bridge.
2152 bridge_rtflush(struct bridge_softc *sc, int full)
2154 struct bridge_rtnode *brt, *nbrt;
2156 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2157 nbrt = LIST_NEXT(brt, brt_list);
2158 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2159 bridge_rtnode_destroy(sc, brt);
2166 * Remove an address from the table.
2169 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr)
2171 struct bridge_rtnode *brt;
2173 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
2176 bridge_rtnode_destroy(sc, brt);
2183 * Delete routes to a speicifc member interface.
2186 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2188 struct bridge_rtnode *brt, *nbrt;
2190 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2191 nbrt = LIST_NEXT(brt, brt_list);
2192 if (brt->brt_ifp == ifp && (full ||
2193 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2194 bridge_rtnode_destroy(sc, brt);
2199 * bridge_rtable_init:
2201 * Initialize the route table for this bridge.
2204 bridge_rtable_init(struct bridge_softc *sc)
2208 sc->sc_rthash = kmalloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2209 M_DEVBUF, M_WAITOK);
2211 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2212 LIST_INIT(&sc->sc_rthash[i]);
2214 sc->sc_rthash_key = karc4random();
2216 LIST_INIT(&sc->sc_rtlist);
2222 * bridge_rtable_fini:
2224 * Deconstruct the route table for this bridge.
2227 bridge_rtable_fini(struct bridge_softc *sc)
2230 kfree(sc->sc_rthash, M_DEVBUF);
2234 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2235 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2237 #define mix(a, b, c) \
2239 a -= b; a -= c; a ^= (c >> 13); \
2240 b -= c; b -= a; b ^= (a << 8); \
2241 c -= a; c -= b; c ^= (b >> 13); \
2242 a -= b; a -= c; a ^= (c >> 12); \
2243 b -= c; b -= a; b ^= (a << 16); \
2244 c -= a; c -= b; c ^= (b >> 5); \
2245 a -= b; a -= c; a ^= (c >> 3); \
2246 b -= c; b -= a; b ^= (a << 10); \
2247 c -= a; c -= b; c ^= (b >> 15); \
2248 } while (/*CONSTCOND*/0)
2250 static __inline uint32_t
2251 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2253 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2264 return (c & BRIDGE_RTHASH_MASK);
2270 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2274 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2275 d = ((int)a[i]) - ((int)b[i]);
2282 * bridge_rtnode_lookup:
2284 * Look up a bridge route node for the specified destination.
2286 static struct bridge_rtnode *
2287 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr)
2289 struct bridge_rtnode *brt;
2293 hash = bridge_rthash(sc, addr);
2294 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2295 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2306 * bridge_rtnode_insert:
2308 * Insert the specified bridge node into the route table. We
2309 * assume the entry is not already in the table.
2312 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2314 struct bridge_rtnode *lbrt;
2318 hash = bridge_rthash(sc, brt->brt_addr);
2320 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2322 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2327 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2331 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2334 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2335 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2338 lbrt = LIST_NEXT(lbrt, brt_hash);
2339 } while (lbrt != NULL);
2342 panic("bridge_rtnode_insert: impossible");
2346 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2353 * bridge_rtnode_destroy:
2355 * Destroy a bridge rtnode.
2358 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2361 LIST_REMOVE(brt, brt_hash);
2363 LIST_REMOVE(brt, brt_list);
2365 kfree(brt, M_DEVBUF);
2369 * Send bridge packets through pfil if they are one of the types pfil can deal
2370 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
2371 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2375 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2377 int snap, error, i, hlen;
2378 struct ether_header *eh1, eh2;
2381 u_int16_t ether_type;
2384 error = -1; /* Default error if not error == 0 */
2386 if (pfil_bridge == 0 && pfil_member == 0)
2387 return (0); /* filtering is disabled */
2389 i = min((*mp)->m_pkthdr.len, max_protohdr);
2390 if ((*mp)->m_len < i) {
2391 *mp = m_pullup(*mp, i);
2393 kprintf("%s: m_pullup failed\n", __func__);
2398 eh1 = mtod(*mp, struct ether_header *);
2399 ether_type = ntohs(eh1->ether_type);
2402 * Check for SNAP/LLC.
2404 if (ether_type < ETHERMTU) {
2405 struct llc *llc2 = (struct llc *)(eh1 + 1);
2407 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
2408 llc2->llc_dsap == LLC_SNAP_LSAP &&
2409 llc2->llc_ssap == LLC_SNAP_LSAP &&
2410 llc2->llc_control == LLC_UI) {
2411 ether_type = htons(llc2->llc_un.type_snap.ether_type);
2417 * If we're trying to filter bridge traffic, don't look at anything
2418 * other than IP and ARP traffic. If the filter doesn't understand
2419 * IPv6, don't allow IPv6 through the bridge either. This is lame
2420 * since if we really wanted, say, an AppleTalk filter, we are hosed,
2421 * but of course we don't have an AppleTalk filter to begin with.
2422 * (Note that since pfil doesn't understand ARP it will pass *ALL*
2425 switch (ether_type) {
2427 case ETHERTYPE_REVARP:
2428 return (0); /* Automatically pass */
2431 case ETHERTYPE_IPV6:
2436 * Check to see if the user wants to pass non-ip
2437 * packets, these will not be checked by pfil(9) and
2438 * passed unconditionally so the default is to drop.
2444 /* Strip off the Ethernet header and keep a copy. */
2445 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
2446 m_adj(*mp, ETHER_HDR_LEN);
2448 /* Strip off snap header, if present */
2450 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
2451 m_adj(*mp, sizeof(struct llc));
2455 * Check the IP header for alignment and errors
2457 if (dir == PFIL_IN) {
2458 switch (ether_type) {
2460 error = bridge_ip_checkbasic(mp);
2463 case ETHERTYPE_IPV6:
2464 error = bridge_ip6_checkbasic(mp);
2477 * Run the packet through pfil
2483 * before calling the firewall, swap fields the same as
2484 * IP does. here we assume the header is contiguous
2486 ip = mtod(*mp, struct ip *);
2488 ip->ip_len = ntohs(ip->ip_len);
2489 ip->ip_off = ntohs(ip->ip_off);
2492 * Run pfil on the member interface and the bridge, both can
2493 * be skipped by clearing pfil_member or pfil_bridge.
2496 * in_if -> bridge_if -> out_if
2498 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
2499 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
2502 if (*mp == NULL || error != 0) /* filter may consume */
2505 if (pfil_member && ifp != NULL)
2506 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
2509 if (*mp == NULL || error != 0) /* filter may consume */
2512 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
2513 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
2516 if (*mp == NULL || error != 0) /* filter may consume */
2519 /* check if we need to fragment the packet */
2520 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
2521 i = (*mp)->m_pkthdr.len;
2522 if (i > ifp->if_mtu) {
2523 error = bridge_fragment(ifp, *mp, &eh2, snap,
2529 /* Recalculate the ip checksum and restore byte ordering */
2530 ip = mtod(*mp, struct ip *);
2531 hlen = ip->ip_hl << 2;
2532 if (hlen < sizeof(struct ip))
2534 if (hlen > (*mp)->m_len) {
2535 if ((*mp = m_pullup(*mp, hlen)) == 0)
2537 ip = mtod(*mp, struct ip *);
2541 ip->ip_len = htons(ip->ip_len);
2542 ip->ip_off = htons(ip->ip_off);
2544 if (hlen == sizeof(struct ip))
2545 ip->ip_sum = in_cksum_hdr(ip);
2547 ip->ip_sum = in_cksum(*mp, hlen);
2551 case ETHERTYPE_IPV6 :
2552 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
2553 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
2556 if (*mp == NULL || error != 0) /* filter may consume */
2559 if (pfil_member && ifp != NULL)
2560 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
2563 if (*mp == NULL || error != 0) /* filter may consume */
2566 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
2567 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
2584 * Finally, put everything back the way it was and return
2587 M_PREPEND(*mp, sizeof(struct llc), MB_DONTWAIT);
2590 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
2593 M_PREPEND(*mp, ETHER_HDR_LEN, MB_DONTWAIT);
2596 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
2607 * Perform basic checks on header size since
2608 * pfil assumes ip_input has already processed
2609 * it for it. Cut-and-pasted from ip_input.c.
2610 * Given how simple the IPv6 version is,
2611 * does the IPv4 version really need to be
2614 * XXX Should we update ipstat here, or not?
2615 * XXX Right now we update ipstat but not
2619 bridge_ip_checkbasic(struct mbuf **mp)
2621 struct mbuf *m = *mp;
2629 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
2630 if ((m = m_copyup(m, sizeof(struct ip),
2631 (max_linkhdr + 3) & ~3)) == NULL) {
2632 /* XXXJRT new stat, please */
2633 ipstat.ips_toosmall++;
2638 #ifndef __predict_false
2639 #define __predict_false(x) x
2641 if (__predict_false(m->m_len < sizeof (struct ip))) {
2642 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
2643 ipstat.ips_toosmall++;
2647 ip = mtod(m, struct ip *);
2648 if (ip == NULL) goto bad;
2650 if (ip->ip_v != IPVERSION) {
2651 ipstat.ips_badvers++;
2654 hlen = ip->ip_hl << 2;
2655 if (hlen < sizeof(struct ip)) { /* minimum header length */
2656 ipstat.ips_badhlen++;
2659 if (hlen > m->m_len) {
2660 if ((m = m_pullup(m, hlen)) == 0) {
2661 ipstat.ips_badhlen++;
2664 ip = mtod(m, struct ip *);
2665 if (ip == NULL) goto bad;
2668 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
2669 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
2671 if (hlen == sizeof(struct ip)) {
2672 sum = in_cksum_hdr(ip);
2674 sum = in_cksum(m, hlen);
2678 ipstat.ips_badsum++;
2682 /* Retrieve the packet length. */
2683 len = ntohs(ip->ip_len);
2686 * Check for additional length bogosity
2689 ipstat.ips_badlen++;
2694 * Check that the amount of data in the buffers
2695 * is as at least much as the IP header would have us expect.
2696 * Drop packet if shorter than we expect.
2698 if (m->m_pkthdr.len < len) {
2699 ipstat.ips_tooshort++;
2703 /* Checks out, proceed */
2714 * Same as above, but for IPv6.
2715 * Cut-and-pasted from ip6_input.c.
2716 * XXX Should we update ip6stat, or not?
2719 bridge_ip6_checkbasic(struct mbuf **mp)
2721 struct mbuf *m = *mp;
2722 struct ip6_hdr *ip6;
2725 * If the IPv6 header is not aligned, slurp it up into a new
2726 * mbuf with space for link headers, in the event we forward
2727 * it. Otherwise, if it is aligned, make sure the entire base
2728 * IPv6 header is in the first mbuf of the chain.
2731 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
2732 struct ifnet *inifp = m->m_pkthdr.rcvif;
2733 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
2734 (max_linkhdr + 3) & ~3)) == NULL) {
2735 /* XXXJRT new stat, please */
2736 ip6stat.ip6s_toosmall++;
2737 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
2742 if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
2743 struct ifnet *inifp = m->m_pkthdr.rcvif;
2744 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
2745 ip6stat.ip6s_toosmall++;
2746 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
2751 ip6 = mtod(m, struct ip6_hdr *);
2753 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
2754 ip6stat.ip6s_badvers++;
2755 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
2759 /* Checks out, proceed */
2772 * Return a fragmented mbuf chain.
2775 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
2776 int snap, struct llc *llc)
2782 if (m->m_len < sizeof(struct ip) &&
2783 (m = m_pullup(m, sizeof(struct ip))) == NULL)
2785 ip = mtod(m, struct ip *);
2787 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
2792 /* walk the chain and re-add the Ethernet header */
2793 for (m0 = m; m0; m0 = m0->m_nextpkt) {
2796 M_PREPEND(m0, sizeof(struct llc), MB_DONTWAIT);
2801 bcopy(llc, mtod(m0, caddr_t),
2802 sizeof(struct llc));
2804 M_PREPEND(m0, ETHER_HDR_LEN, MB_DONTWAIT);
2809 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
2815 ipstat.ips_fragmented++;
2826 bridge_enqueue_handler(struct netmsg *nmsg)
2828 struct netmsg_packet *nmp;
2829 struct ifnet *dst_ifp;
2832 nmp = (struct netmsg_packet *)nmsg;
2834 dst_ifp = nmp->nm_netmsg.nm_lmsg.u.ms_resultp;
2836 bridge_handoff_notags(dst_ifp, m);
2840 bridge_pfil_enqueue_handler(struct netmsg *nmsg)
2842 struct netmsg_packet *nmp;
2843 struct ifnet *dst_ifp;
2846 nmp = (struct netmsg_packet *)nmsg;
2848 dst_ifp = nmp->nm_netmsg.nm_lmsg.u.ms_resultp;
2851 * Filter on the output interface. Pass a NULL bridge interface
2852 * pointer so we do not redundantly filter on the bridge for
2853 * each interface we broadcast on.
2855 if (inet_pfil_hook.ph_hashooks > 0
2857 || inet6_pfil_hook.ph_hashooks > 0
2860 if (bridge_pfil(&m, NULL, dst_ifp, PFIL_OUT) != 0)
2865 bridge_handoff_notags(dst_ifp, m);
2869 bridge_handoff(struct ifnet *dst_ifp, struct mbuf *m)
2871 while (m->m_type == MT_TAG) {
2872 /* XXX see ether_output_frame for full rules check */
2875 bridge_handoff_notags(dst_ifp, m);
2879 bridge_handoff_notags(struct ifnet *dst_ifp, struct mbuf *m)
2883 KKASSERT(m->m_type != MT_TAG);
2885 lwkt_serialize_enter(dst_ifp->if_serializer);
2887 /* We may be sending a fragment so traverse the mbuf */
2889 struct altq_pktattr pktattr;
2892 m->m_nextpkt = NULL;
2894 if (ifq_is_enabled(&dst_ifp->if_snd))
2895 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr);
2897 ifq_handoff(dst_ifp, m, &pktattr);
2900 lwkt_serialize_exit(dst_ifp->if_serializer);