xref: /freebsd/sys/net/if_bridge.c (revision 195ebc7e9e4b129de810833791a19dfb4349d6a9)
1 /*	$NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $	*/
2 
3 /*
4  * Copyright 2001 Wasabi Systems, Inc.
5  * All rights reserved.
6  *
7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *	This product includes software developed for the NetBSD Project by
20  *	Wasabi Systems, Inc.
21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22  *    or promote products derived from this software without specific prior
23  *    written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35  * POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 /*
39  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
40  * All rights reserved.
41  *
42  * Redistribution and use in source and binary forms, with or without
43  * modification, are permitted provided that the following conditions
44  * are met:
45  * 1. Redistributions of source code must retain the above copyright
46  *    notice, this list of conditions and the following disclaimer.
47  * 2. Redistributions in binary form must reproduce the above copyright
48  *    notice, this list of conditions and the following disclaimer in the
49  *    documentation and/or other materials provided with the distribution.
50  *
51  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
52  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
53  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
54  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
55  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
56  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
57  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
59  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
60  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
61  * POSSIBILITY OF SUCH DAMAGE.
62  *
63  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
64  */
65 
66 /*
67  * Network interface bridge support.
68  *
69  * TODO:
70  *
71  *	- Currently only supports Ethernet-like interfaces (Ethernet,
72  *	  802.11, VLANs on Ethernet, etc.)  Figure out a nice way
73  *	  to bridge other types of interfaces (FDDI-FDDI, and maybe
74  *	  consider heterogenous bridges).
75  */
76 
77 #include <sys/cdefs.h>
78 __FBSDID("$FreeBSD$");
79 
80 #include "opt_inet.h"
81 #include "opt_inet6.h"
82 #include "opt_carp.h"
83 
84 #include <sys/param.h>
85 #include <sys/mbuf.h>
86 #include <sys/malloc.h>
87 #include <sys/protosw.h>
88 #include <sys/systm.h>
89 #include <sys/time.h>
90 #include <sys/socket.h> /* for net/if.h */
91 #include <sys/sockio.h>
92 #include <sys/ctype.h>  /* string functions */
93 #include <sys/kernel.h>
94 #include <sys/random.h>
95 #include <sys/syslog.h>
96 #include <sys/sysctl.h>
97 #include <vm/uma.h>
98 #include <sys/module.h>
99 #include <sys/priv.h>
100 #include <sys/proc.h>
101 #include <sys/lock.h>
102 #include <sys/mutex.h>
103 #include <sys/rwlock.h>
104 #include <sys/vimage.h>
105 
106 #include <net/bpf.h>
107 #include <net/if.h>
108 #include <net/if_clone.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 
114 #include <netinet/in.h> /* for struct arpcom */
115 #include <netinet/in_systm.h>
116 #include <netinet/in_var.h>
117 #include <netinet/ip.h>
118 #include <netinet/ip_var.h>
119 #include <netinet/vinet.h>
120 #ifdef INET6
121 #include <netinet/ip6.h>
122 #include <netinet6/ip6_var.h>
123 #include <netinet6/vinet6.h>
124 #endif
125 #ifdef DEV_CARP
126 #include <netinet/ip_carp.h>
127 #endif
128 #include <machine/in_cksum.h>
129 #include <netinet/if_ether.h> /* for struct arpcom */
130 #include <net/bridgestp.h>
131 #include <net/if_bridgevar.h>
132 #include <net/if_llc.h>
133 #include <net/if_vlan_var.h>
134 
135 #include <net/route.h>
136 #include <netinet/ip_fw.h>
137 #include <netinet/ip_dummynet.h>
138 
139 /*
140  * Size of the route hash table.  Must be a power of two.
141  */
142 #ifndef BRIDGE_RTHASH_SIZE
143 #define	BRIDGE_RTHASH_SIZE		1024
144 #endif
145 
146 #define	BRIDGE_RTHASH_MASK		(BRIDGE_RTHASH_SIZE - 1)
147 
148 /*
149  * Maximum number of addresses to cache.
150  */
151 #ifndef BRIDGE_RTABLE_MAX
152 #define	BRIDGE_RTABLE_MAX		100
153 #endif
154 
155 /*
156  * Timeout (in seconds) for entries learned dynamically.
157  */
158 #ifndef BRIDGE_RTABLE_TIMEOUT
159 #define	BRIDGE_RTABLE_TIMEOUT		(20 * 60)	/* same as ARP */
160 #endif
161 
162 /*
163  * Number of seconds between walks of the route list.
164  */
165 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
166 #define	BRIDGE_RTABLE_PRUNE_PERIOD	(5 * 60)
167 #endif
168 
169 /*
170  * List of capabilities to possibly mask on the member interface.
171  */
172 #define	BRIDGE_IFCAPS_MASK		(IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
173 
174 /*
175  * Bridge interface list entry.
176  */
177 struct bridge_iflist {
178 	LIST_ENTRY(bridge_iflist) bif_next;
179 	struct ifnet		*bif_ifp;	/* member if */
180 	struct bstp_port	bif_stp;	/* STP state */
181 	uint32_t		bif_flags;	/* member if flags */
182 	int			bif_savedcaps;	/* saved capabilities */
183 	uint32_t		bif_addrmax;	/* max # of addresses */
184 	uint32_t		bif_addrcnt;	/* cur. # of addresses */
185 	uint32_t		bif_addrexceeded;/* # of address violations */
186 };
187 
188 /*
189  * Bridge route node.
190  */
191 struct bridge_rtnode {
192 	LIST_ENTRY(bridge_rtnode) brt_hash;	/* hash table linkage */
193 	LIST_ENTRY(bridge_rtnode) brt_list;	/* list linkage */
194 	struct bridge_iflist	*brt_dst;	/* destination if */
195 	unsigned long		brt_expire;	/* expiration time */
196 	uint8_t			brt_flags;	/* address flags */
197 	uint8_t			brt_addr[ETHER_ADDR_LEN];
198 	uint16_t		brt_vlan;	/* vlan id */
199 };
200 #define	brt_ifp			brt_dst->bif_ifp
201 
202 /*
203  * Software state for each bridge.
204  */
205 struct bridge_softc {
206 	struct ifnet		*sc_ifp;	/* make this an interface */
207 	LIST_ENTRY(bridge_softc) sc_list;
208 	struct mtx		sc_mtx;
209 	struct cv		sc_cv;
210 	uint32_t		sc_brtmax;	/* max # of addresses */
211 	uint32_t		sc_brtcnt;	/* cur. # of addresses */
212 	uint32_t		sc_brttimeout;	/* rt timeout in seconds */
213 	struct callout		sc_brcallout;	/* bridge callout */
214 	uint32_t		sc_iflist_ref;	/* refcount for sc_iflist */
215 	uint32_t		sc_iflist_xcnt;	/* refcount for sc_iflist */
216 	LIST_HEAD(, bridge_iflist) sc_iflist;	/* member interface list */
217 	LIST_HEAD(, bridge_rtnode) *sc_rthash;	/* our forwarding table */
218 	LIST_HEAD(, bridge_rtnode) sc_rtlist;	/* list version of above */
219 	uint32_t		sc_rthash_key;	/* key for hash */
220 	LIST_HEAD(, bridge_iflist) sc_spanlist;	/* span ports list */
221 	struct bstp_state	sc_stp;		/* STP state */
222 	uint32_t		sc_brtexceeded;	/* # of cache drops */
223 	struct ifnet		*sc_ifaddr;	/* member mac copied from */
224 	u_char			sc_defaddr[6];	/* Default MAC address */
225 };
226 
227 static struct mtx 	bridge_list_mtx;
228 eventhandler_tag	bridge_detach_cookie = NULL;
229 
230 int	bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
231 
232 uma_zone_t bridge_rtnode_zone;
233 
234 static int	bridge_clone_create(struct if_clone *, int, caddr_t);
235 static void	bridge_clone_destroy(struct ifnet *);
236 
237 static int	bridge_ioctl(struct ifnet *, u_long, caddr_t);
238 static void	bridge_mutecaps(struct bridge_softc *);
239 static void	bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
240 		    int);
241 static void	bridge_ifdetach(void *arg __unused, struct ifnet *);
242 static void	bridge_init(void *);
243 static void	bridge_dummynet(struct mbuf *, struct ifnet *);
244 static void	bridge_stop(struct ifnet *, int);
245 static void	bridge_start(struct ifnet *);
246 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
247 static int	bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
248 		    struct rtentry *);
249 static void	bridge_enqueue(struct bridge_softc *, struct ifnet *,
250 		    struct mbuf *);
251 static void	bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
252 
253 static void	bridge_forward(struct bridge_softc *, struct bridge_iflist *,
254 		    struct mbuf *m);
255 
256 static void	bridge_timer(void *);
257 
258 static void	bridge_broadcast(struct bridge_softc *, struct ifnet *,
259 		    struct mbuf *, int);
260 static void	bridge_span(struct bridge_softc *, struct mbuf *);
261 
262 static int	bridge_rtupdate(struct bridge_softc *, const uint8_t *,
263 		    uint16_t, struct bridge_iflist *, int, uint8_t);
264 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
265 		    uint16_t);
266 static void	bridge_rttrim(struct bridge_softc *);
267 static void	bridge_rtage(struct bridge_softc *);
268 static void	bridge_rtflush(struct bridge_softc *, int);
269 static int	bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
270 		    uint16_t);
271 
272 static int	bridge_rtable_init(struct bridge_softc *);
273 static void	bridge_rtable_fini(struct bridge_softc *);
274 
275 static int	bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
276 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
277 		    const uint8_t *, uint16_t);
278 static int	bridge_rtnode_insert(struct bridge_softc *,
279 		    struct bridge_rtnode *);
280 static void	bridge_rtnode_destroy(struct bridge_softc *,
281 		    struct bridge_rtnode *);
282 static void	bridge_rtable_expire(struct ifnet *, int);
283 static void	bridge_state_change(struct ifnet *, int);
284 
285 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
286 		    const char *name);
287 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
288 		    struct ifnet *ifp);
289 static void	bridge_delete_member(struct bridge_softc *,
290 		    struct bridge_iflist *, int);
291 static void	bridge_delete_span(struct bridge_softc *,
292 		    struct bridge_iflist *);
293 
294 static int	bridge_ioctl_add(struct bridge_softc *, void *);
295 static int	bridge_ioctl_del(struct bridge_softc *, void *);
296 static int	bridge_ioctl_gifflags(struct bridge_softc *, void *);
297 static int	bridge_ioctl_sifflags(struct bridge_softc *, void *);
298 static int	bridge_ioctl_scache(struct bridge_softc *, void *);
299 static int	bridge_ioctl_gcache(struct bridge_softc *, void *);
300 static int	bridge_ioctl_gifs(struct bridge_softc *, void *);
301 static int	bridge_ioctl_rts(struct bridge_softc *, void *);
302 static int	bridge_ioctl_saddr(struct bridge_softc *, void *);
303 static int	bridge_ioctl_sto(struct bridge_softc *, void *);
304 static int	bridge_ioctl_gto(struct bridge_softc *, void *);
305 static int	bridge_ioctl_daddr(struct bridge_softc *, void *);
306 static int	bridge_ioctl_flush(struct bridge_softc *, void *);
307 static int	bridge_ioctl_gpri(struct bridge_softc *, void *);
308 static int	bridge_ioctl_spri(struct bridge_softc *, void *);
309 static int	bridge_ioctl_ght(struct bridge_softc *, void *);
310 static int	bridge_ioctl_sht(struct bridge_softc *, void *);
311 static int	bridge_ioctl_gfd(struct bridge_softc *, void *);
312 static int	bridge_ioctl_sfd(struct bridge_softc *, void *);
313 static int	bridge_ioctl_gma(struct bridge_softc *, void *);
314 static int	bridge_ioctl_sma(struct bridge_softc *, void *);
315 static int	bridge_ioctl_sifprio(struct bridge_softc *, void *);
316 static int	bridge_ioctl_sifcost(struct bridge_softc *, void *);
317 static int	bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
318 static int	bridge_ioctl_addspan(struct bridge_softc *, void *);
319 static int	bridge_ioctl_delspan(struct bridge_softc *, void *);
320 static int	bridge_ioctl_gbparam(struct bridge_softc *, void *);
321 static int	bridge_ioctl_grte(struct bridge_softc *, void *);
322 static int	bridge_ioctl_gifsstp(struct bridge_softc *, void *);
323 static int	bridge_ioctl_sproto(struct bridge_softc *, void *);
324 static int	bridge_ioctl_stxhc(struct bridge_softc *, void *);
325 static int	bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
326 		    int);
327 static int	bridge_ip_checkbasic(struct mbuf **mp);
328 #ifdef INET6
329 static int	bridge_ip6_checkbasic(struct mbuf **mp);
330 #endif /* INET6 */
331 static int	bridge_fragment(struct ifnet *, struct mbuf *,
332 		    struct ether_header *, int, struct llc *);
333 
334 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
335 #define	VLANTAGOF(_m)	\
336     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
337 
338 static struct bstp_cb_ops bridge_ops = {
339 	.bcb_state = bridge_state_change,
340 	.bcb_rtage = bridge_rtable_expire
341 };
342 
343 SYSCTL_DECL(_net_link);
344 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
345 
346 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
347 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
348 static int pfil_member = 1; /* run pfil hooks on the member interface */
349 static int pfil_ipfw = 0;   /* layer2 filter with ipfw */
350 static int pfil_ipfw_arp = 0;   /* layer2 filter with ipfw */
351 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
352                                    locally destined packets */
353 static int log_stp   = 0;   /* log STP state changes */
354 static int bridge_inherit_mac = 0;   /* share MAC with first bridge member */
355 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
356     &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
357 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
358     &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
360     &pfil_bridge, 0, "Packet filter on the bridge interface");
361 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
362     &pfil_member, 0, "Packet filter on the member interface");
363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
364     &pfil_local_phys, 0,
365     "Packet filter on the physical interface for locally destined packets");
366 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
367     &log_stp, 0, "Log STP state changes");
368 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
369     &bridge_inherit_mac, 0,
370     "Inherit MAC address from the first bridge member");
371 
372 struct bridge_control {
373 	int	(*bc_func)(struct bridge_softc *, void *);
374 	int	bc_argsize;
375 	int	bc_flags;
376 };
377 
378 #define	BC_F_COPYIN		0x01	/* copy arguments in */
379 #define	BC_F_COPYOUT		0x02	/* copy arguments out */
380 #define	BC_F_SUSER		0x04	/* do super-user check */
381 
382 const struct bridge_control bridge_control_table[] = {
383 	{ bridge_ioctl_add,		sizeof(struct ifbreq),
384 	  BC_F_COPYIN|BC_F_SUSER },
385 	{ bridge_ioctl_del,		sizeof(struct ifbreq),
386 	  BC_F_COPYIN|BC_F_SUSER },
387 
388 	{ bridge_ioctl_gifflags,	sizeof(struct ifbreq),
389 	  BC_F_COPYIN|BC_F_COPYOUT },
390 	{ bridge_ioctl_sifflags,	sizeof(struct ifbreq),
391 	  BC_F_COPYIN|BC_F_SUSER },
392 
393 	{ bridge_ioctl_scache,		sizeof(struct ifbrparam),
394 	  BC_F_COPYIN|BC_F_SUSER },
395 	{ bridge_ioctl_gcache,		sizeof(struct ifbrparam),
396 	  BC_F_COPYOUT },
397 
398 	{ bridge_ioctl_gifs,		sizeof(struct ifbifconf),
399 	  BC_F_COPYIN|BC_F_COPYOUT },
400 	{ bridge_ioctl_rts,		sizeof(struct ifbaconf),
401 	  BC_F_COPYIN|BC_F_COPYOUT },
402 
403 	{ bridge_ioctl_saddr,		sizeof(struct ifbareq),
404 	  BC_F_COPYIN|BC_F_SUSER },
405 
406 	{ bridge_ioctl_sto,		sizeof(struct ifbrparam),
407 	  BC_F_COPYIN|BC_F_SUSER },
408 	{ bridge_ioctl_gto,		sizeof(struct ifbrparam),
409 	  BC_F_COPYOUT },
410 
411 	{ bridge_ioctl_daddr,		sizeof(struct ifbareq),
412 	  BC_F_COPYIN|BC_F_SUSER },
413 
414 	{ bridge_ioctl_flush,		sizeof(struct ifbreq),
415 	  BC_F_COPYIN|BC_F_SUSER },
416 
417 	{ bridge_ioctl_gpri,		sizeof(struct ifbrparam),
418 	  BC_F_COPYOUT },
419 	{ bridge_ioctl_spri,		sizeof(struct ifbrparam),
420 	  BC_F_COPYIN|BC_F_SUSER },
421 
422 	{ bridge_ioctl_ght,		sizeof(struct ifbrparam),
423 	  BC_F_COPYOUT },
424 	{ bridge_ioctl_sht,		sizeof(struct ifbrparam),
425 	  BC_F_COPYIN|BC_F_SUSER },
426 
427 	{ bridge_ioctl_gfd,		sizeof(struct ifbrparam),
428 	  BC_F_COPYOUT },
429 	{ bridge_ioctl_sfd,		sizeof(struct ifbrparam),
430 	  BC_F_COPYIN|BC_F_SUSER },
431 
432 	{ bridge_ioctl_gma,		sizeof(struct ifbrparam),
433 	  BC_F_COPYOUT },
434 	{ bridge_ioctl_sma,		sizeof(struct ifbrparam),
435 	  BC_F_COPYIN|BC_F_SUSER },
436 
437 	{ bridge_ioctl_sifprio,		sizeof(struct ifbreq),
438 	  BC_F_COPYIN|BC_F_SUSER },
439 
440 	{ bridge_ioctl_sifcost,		sizeof(struct ifbreq),
441 	  BC_F_COPYIN|BC_F_SUSER },
442 
443 	{ bridge_ioctl_addspan,		sizeof(struct ifbreq),
444 	  BC_F_COPYIN|BC_F_SUSER },
445 	{ bridge_ioctl_delspan,		sizeof(struct ifbreq),
446 	  BC_F_COPYIN|BC_F_SUSER },
447 
448 	{ bridge_ioctl_gbparam,		sizeof(struct ifbropreq),
449 	  BC_F_COPYOUT },
450 
451 	{ bridge_ioctl_grte,		sizeof(struct ifbrparam),
452 	  BC_F_COPYOUT },
453 
454 	{ bridge_ioctl_gifsstp,		sizeof(struct ifbpstpconf),
455 	  BC_F_COPYIN|BC_F_COPYOUT },
456 
457 	{ bridge_ioctl_sproto,		sizeof(struct ifbrparam),
458 	  BC_F_COPYIN|BC_F_SUSER },
459 
460 	{ bridge_ioctl_stxhc,		sizeof(struct ifbrparam),
461 	  BC_F_COPYIN|BC_F_SUSER },
462 
463 	{ bridge_ioctl_sifmaxaddr,	sizeof(struct ifbreq),
464 	  BC_F_COPYIN|BC_F_SUSER },
465 
466 };
467 const int bridge_control_table_size =
468     sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
469 
470 LIST_HEAD(, bridge_softc) bridge_list;
471 
472 IFC_SIMPLE_DECLARE(bridge, 0);
473 
474 static int
475 bridge_modevent(module_t mod, int type, void *data)
476 {
477 
478 	switch (type) {
479 	case MOD_LOAD:
480 		mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
481 		if_clone_attach(&bridge_cloner);
482 		bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
483 		    sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
484 		    UMA_ALIGN_PTR, 0);
485 		LIST_INIT(&bridge_list);
486 		bridge_input_p = bridge_input;
487 		bridge_output_p = bridge_output;
488 		bridge_dn_p = bridge_dummynet;
489 		bridge_detach_cookie = EVENTHANDLER_REGISTER(
490 		    ifnet_departure_event, bridge_ifdetach, NULL,
491 		    EVENTHANDLER_PRI_ANY);
492 		break;
493 	case MOD_UNLOAD:
494 		EVENTHANDLER_DEREGISTER(ifnet_departure_event,
495 		    bridge_detach_cookie);
496 		if_clone_detach(&bridge_cloner);
497 		uma_zdestroy(bridge_rtnode_zone);
498 		bridge_input_p = NULL;
499 		bridge_output_p = NULL;
500 		bridge_dn_p = NULL;
501 		mtx_destroy(&bridge_list_mtx);
502 		break;
503 	default:
504 		return (EOPNOTSUPP);
505 	}
506 	return (0);
507 }
508 
509 static moduledata_t bridge_mod = {
510 	"if_bridge",
511 	bridge_modevent,
512 	0
513 };
514 
515 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
516 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
517 
518 /*
519  * handler for net.link.bridge.pfil_ipfw
520  */
521 static int
522 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
523 {
524 	int enable = pfil_ipfw;
525 	int error;
526 
527 	error = sysctl_handle_int(oidp, &enable, 0, req);
528 	enable = (enable) ? 1 : 0;
529 
530 	if (enable != pfil_ipfw) {
531 		pfil_ipfw = enable;
532 
533 		/*
534 		 * Disable pfil so that ipfw doesnt run twice, if the user
535 		 * really wants both then they can re-enable pfil_bridge and/or
536 		 * pfil_member. Also allow non-ip packets as ipfw can filter by
537 		 * layer2 type.
538 		 */
539 		if (pfil_ipfw) {
540 			pfil_onlyip = 0;
541 			pfil_bridge = 0;
542 			pfil_member = 0;
543 		}
544 	}
545 
546 	return (error);
547 }
548 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
549 	    &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
550 
551 /*
552  * bridge_clone_create:
553  *
554  *	Create a new bridge instance.
555  */
556 static int
557 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
558 {
559 	struct bridge_softc *sc, *sc2;
560 	struct ifnet *bifp, *ifp;
561 	int retry;
562 
563 	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
564 	ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
565 	if (ifp == NULL) {
566 		free(sc, M_DEVBUF);
567 		return (ENOSPC);
568 	}
569 
570 	BRIDGE_LOCK_INIT(sc);
571 	sc->sc_brtmax = BRIDGE_RTABLE_MAX;
572 	sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
573 
574 	/* Initialize our routing table. */
575 	bridge_rtable_init(sc);
576 
577 	callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
578 
579 	LIST_INIT(&sc->sc_iflist);
580 	LIST_INIT(&sc->sc_spanlist);
581 
582 	ifp->if_softc = sc;
583 	if_initname(ifp, ifc->ifc_name, unit);
584 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
585 	ifp->if_ioctl = bridge_ioctl;
586 	ifp->if_start = bridge_start;
587 	ifp->if_init = bridge_init;
588 	ifp->if_type = IFT_BRIDGE;
589 	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
590 	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
591 	IFQ_SET_READY(&ifp->if_snd);
592 
593 	/*
594 	 * Generate a random ethernet address with a locally administered
595 	 * address.
596 	 *
597 	 * Since we are using random ethernet addresses for the bridge, it is
598 	 * possible that we might have address collisions, so make sure that
599 	 * this hardware address isn't already in use on another bridge.
600 	 */
601 	for (retry = 1; retry != 0;) {
602 		arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
603 		sc->sc_defaddr[0] &= ~1;	/* clear multicast bit */
604 		sc->sc_defaddr[0] |= 2;		/* set the LAA bit */
605 		retry = 0;
606 		mtx_lock(&bridge_list_mtx);
607 		LIST_FOREACH(sc2, &bridge_list, sc_list) {
608 			bifp = sc2->sc_ifp;
609 			if (memcmp(sc->sc_defaddr,
610 			    IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
611 				retry = 1;
612 		}
613 		mtx_unlock(&bridge_list_mtx);
614 	}
615 
616 	bstp_attach(&sc->sc_stp, &bridge_ops);
617 	ether_ifattach(ifp, sc->sc_defaddr);
618 	/* Now undo some of the damage... */
619 	ifp->if_baudrate = 0;
620 	ifp->if_type = IFT_BRIDGE;
621 
622 	mtx_lock(&bridge_list_mtx);
623 	LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
624 	mtx_unlock(&bridge_list_mtx);
625 
626 	return (0);
627 }
628 
629 /*
630  * bridge_clone_destroy:
631  *
632  *	Destroy a bridge instance.
633  */
634 static void
635 bridge_clone_destroy(struct ifnet *ifp)
636 {
637 	struct bridge_softc *sc = ifp->if_softc;
638 	struct bridge_iflist *bif;
639 
640 	BRIDGE_LOCK(sc);
641 
642 	bridge_stop(ifp, 1);
643 	ifp->if_flags &= ~IFF_UP;
644 
645 	while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
646 		bridge_delete_member(sc, bif, 0);
647 
648 	while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
649 		bridge_delete_span(sc, bif);
650 	}
651 
652 	BRIDGE_UNLOCK(sc);
653 
654 	callout_drain(&sc->sc_brcallout);
655 
656 	mtx_lock(&bridge_list_mtx);
657 	LIST_REMOVE(sc, sc_list);
658 	mtx_unlock(&bridge_list_mtx);
659 
660 	bstp_detach(&sc->sc_stp);
661 	ether_ifdetach(ifp);
662 	if_free_type(ifp, IFT_ETHER);
663 
664 	/* Tear down the routing table. */
665 	bridge_rtable_fini(sc);
666 
667 	BRIDGE_LOCK_DESTROY(sc);
668 	free(sc, M_DEVBUF);
669 }
670 
671 /*
672  * bridge_ioctl:
673  *
674  *	Handle a control request from the operator.
675  */
676 static int
677 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
678 {
679 	struct bridge_softc *sc = ifp->if_softc;
680 	struct thread *td = curthread;
681 	union {
682 		struct ifbreq ifbreq;
683 		struct ifbifconf ifbifconf;
684 		struct ifbareq ifbareq;
685 		struct ifbaconf ifbaconf;
686 		struct ifbrparam ifbrparam;
687 		struct ifbropreq ifbropreq;
688 	} args;
689 	struct ifdrv *ifd = (struct ifdrv *) data;
690 	const struct bridge_control *bc;
691 	int error = 0;
692 
693 	switch (cmd) {
694 
695 	case SIOCADDMULTI:
696 	case SIOCDELMULTI:
697 		break;
698 
699 	case SIOCGDRVSPEC:
700 	case SIOCSDRVSPEC:
701 		if (ifd->ifd_cmd >= bridge_control_table_size) {
702 			error = EINVAL;
703 			break;
704 		}
705 		bc = &bridge_control_table[ifd->ifd_cmd];
706 
707 		if (cmd == SIOCGDRVSPEC &&
708 		    (bc->bc_flags & BC_F_COPYOUT) == 0) {
709 			error = EINVAL;
710 			break;
711 		}
712 		else if (cmd == SIOCSDRVSPEC &&
713 		    (bc->bc_flags & BC_F_COPYOUT) != 0) {
714 			error = EINVAL;
715 			break;
716 		}
717 
718 		if (bc->bc_flags & BC_F_SUSER) {
719 			error = priv_check(td, PRIV_NET_BRIDGE);
720 			if (error)
721 				break;
722 		}
723 
724 		if (ifd->ifd_len != bc->bc_argsize ||
725 		    ifd->ifd_len > sizeof(args)) {
726 			error = EINVAL;
727 			break;
728 		}
729 
730 		bzero(&args, sizeof(args));
731 		if (bc->bc_flags & BC_F_COPYIN) {
732 			error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
733 			if (error)
734 				break;
735 		}
736 
737 		BRIDGE_LOCK(sc);
738 		error = (*bc->bc_func)(sc, &args);
739 		BRIDGE_UNLOCK(sc);
740 		if (error)
741 			break;
742 
743 		if (bc->bc_flags & BC_F_COPYOUT)
744 			error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
745 
746 		break;
747 
748 	case SIOCSIFFLAGS:
749 		if (!(ifp->if_flags & IFF_UP) &&
750 		    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
751 			/*
752 			 * If interface is marked down and it is running,
753 			 * then stop and disable it.
754 			 */
755 			BRIDGE_LOCK(sc);
756 			bridge_stop(ifp, 1);
757 			BRIDGE_UNLOCK(sc);
758 		} else if ((ifp->if_flags & IFF_UP) &&
759 		    !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
760 			/*
761 			 * If interface is marked up and it is stopped, then
762 			 * start it.
763 			 */
764 			(*ifp->if_init)(sc);
765 		}
766 		break;
767 
768 	case SIOCSIFMTU:
769 		/* Do not allow the MTU to be changed on the bridge */
770 		error = EINVAL;
771 		break;
772 
773 	default:
774 		/*
775 		 * drop the lock as ether_ioctl() will call bridge_start() and
776 		 * cause the lock to be recursed.
777 		 */
778 		error = ether_ioctl(ifp, cmd, data);
779 		break;
780 	}
781 
782 	return (error);
783 }
784 
785 /*
786  * bridge_mutecaps:
787  *
788  *	Clear or restore unwanted capabilities on the member interface
789  */
790 static void
791 bridge_mutecaps(struct bridge_softc *sc)
792 {
793 	struct bridge_iflist *bif;
794 	int enabled, mask;
795 
796 	/* Initial bitmask of capabilities to test */
797 	mask = BRIDGE_IFCAPS_MASK;
798 
799 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
800 		/* Every member must support it or its disabled */
801 		mask &= bif->bif_savedcaps;
802 	}
803 
804 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
805 		enabled = bif->bif_ifp->if_capenable;
806 		/* strip off mask bits and enable them again if allowed */
807 		enabled &= ~BRIDGE_IFCAPS_MASK;
808 		enabled |= mask;
809 		/*
810 		 * Receive offload can only be enabled if all members also
811 		 * support send offload.
812 		 */
813 		if ((enabled & IFCAP_TSO) == 0)
814 			enabled &= ~IFCAP_LRO;
815 
816 		bridge_set_ifcap(sc, bif, enabled);
817 	}
818 
819 }
820 
821 static void
822 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
823 {
824 	struct ifnet *ifp = bif->bif_ifp;
825 	struct ifreq ifr;
826 	int error;
827 
828 	bzero(&ifr, sizeof(ifr));
829 	ifr.ifr_reqcap = set;
830 
831 	if (ifp->if_capenable != set) {
832 		error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
833 		if (error)
834 			if_printf(sc->sc_ifp,
835 			    "error setting interface capabilities on %s\n",
836 			    ifp->if_xname);
837 	}
838 }
839 
840 /*
841  * bridge_lookup_member:
842  *
843  *	Lookup a bridge member interface.
844  */
845 static struct bridge_iflist *
846 bridge_lookup_member(struct bridge_softc *sc, const char *name)
847 {
848 	struct bridge_iflist *bif;
849 	struct ifnet *ifp;
850 
851 	BRIDGE_LOCK_ASSERT(sc);
852 
853 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
854 		ifp = bif->bif_ifp;
855 		if (strcmp(ifp->if_xname, name) == 0)
856 			return (bif);
857 	}
858 
859 	return (NULL);
860 }
861 
862 /*
863  * bridge_lookup_member_if:
864  *
865  *	Lookup a bridge member interface by ifnet*.
866  */
867 static struct bridge_iflist *
868 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
869 {
870 	struct bridge_iflist *bif;
871 
872 	BRIDGE_LOCK_ASSERT(sc);
873 
874 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
875 		if (bif->bif_ifp == member_ifp)
876 			return (bif);
877 	}
878 
879 	return (NULL);
880 }
881 
882 /*
883  * bridge_delete_member:
884  *
885  *	Delete the specified member interface.
886  */
887 static void
888 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
889     int gone)
890 {
891 	struct ifnet *ifs = bif->bif_ifp;
892 	struct ifnet *fif = NULL;
893 
894 	BRIDGE_LOCK_ASSERT(sc);
895 
896 	if (bif->bif_flags & IFBIF_STP)
897 		bstp_disable(&bif->bif_stp);
898 
899 	ifs->if_bridge = NULL;
900 	BRIDGE_XLOCK(sc);
901 	LIST_REMOVE(bif, bif_next);
902 	BRIDGE_XDROP(sc);
903 
904 	/*
905 	 * If removing the interface that gave the bridge its mac address, set
906 	 * the mac address of the bridge to the address of the next member, or
907 	 * to its default address if no members are left.
908 	 */
909 	if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
910 		if (LIST_EMPTY(&sc->sc_iflist)) {
911 			bcopy(sc->sc_defaddr,
912 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
913 			sc->sc_ifaddr = NULL;
914 		} else {
915 			fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
916 			bcopy(IF_LLADDR(fif),
917 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
918 			sc->sc_ifaddr = fif;
919 		}
920 	}
921 
922 	bridge_mutecaps(sc);	/* recalcuate now this interface is removed */
923 	bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
924 	KASSERT(bif->bif_addrcnt == 0,
925 	    ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
926 
927 	BRIDGE_UNLOCK(sc);
928 	if (!gone) {
929 		switch (ifs->if_type) {
930 		case IFT_ETHER:
931 		case IFT_L2VLAN:
932 			/*
933 			 * Take the interface out of promiscuous mode.
934 			 */
935 			(void) ifpromisc(ifs, 0);
936 			break;
937 
938 		case IFT_GIF:
939 			break;
940 
941 		default:
942 #ifdef DIAGNOSTIC
943 			panic("bridge_delete_member: impossible");
944 #endif
945 			break;
946 		}
947 		/* reneable any interface capabilities */
948 		bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
949 	}
950 	bstp_destroy(&bif->bif_stp);	/* prepare to free */
951 	BRIDGE_LOCK(sc);
952 	free(bif, M_DEVBUF);
953 }
954 
955 /*
956  * bridge_delete_span:
957  *
958  *	Delete the specified span interface.
959  */
960 static void
961 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
962 {
963 	BRIDGE_LOCK_ASSERT(sc);
964 
965 	KASSERT(bif->bif_ifp->if_bridge == NULL,
966 	    ("%s: not a span interface", __func__));
967 
968 	LIST_REMOVE(bif, bif_next);
969 	free(bif, M_DEVBUF);
970 }
971 
972 static int
973 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
974 {
975 	struct ifbreq *req = arg;
976 	struct bridge_iflist *bif = NULL;
977 	struct ifnet *ifs;
978 	int error = 0;
979 
980 	ifs = ifunit(req->ifbr_ifsname);
981 	if (ifs == NULL)
982 		return (ENOENT);
983 	if (ifs->if_ioctl == NULL)	/* must be supported */
984 		return (EINVAL);
985 
986 	/* If it's in the span list, it can't be a member. */
987 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
988 		if (ifs == bif->bif_ifp)
989 			return (EBUSY);
990 
991 	/* Allow the first Ethernet member to define the MTU */
992 	if (ifs->if_type != IFT_GIF) {
993 		if (LIST_EMPTY(&sc->sc_iflist))
994 			sc->sc_ifp->if_mtu = ifs->if_mtu;
995 		else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
996 			if_printf(sc->sc_ifp, "invalid MTU for %s\n",
997 			    ifs->if_xname);
998 			return (EINVAL);
999 		}
1000 	}
1001 
1002 	if (ifs->if_bridge == sc)
1003 		return (EEXIST);
1004 
1005 	if (ifs->if_bridge != NULL)
1006 		return (EBUSY);
1007 
1008 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1009 	if (bif == NULL)
1010 		return (ENOMEM);
1011 
1012 	bif->bif_ifp = ifs;
1013 	bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1014 	bif->bif_savedcaps = ifs->if_capenable;
1015 
1016 	switch (ifs->if_type) {
1017 	case IFT_ETHER:
1018 	case IFT_L2VLAN:
1019 	case IFT_GIF:
1020 		/* permitted interface types */
1021 		break;
1022 	default:
1023 		error = EINVAL;
1024 		goto out;
1025 	}
1026 
1027 	/*
1028 	 * Assign the interface's MAC address to the bridge if it's the first
1029 	 * member and the MAC address of the bridge has not been changed from
1030 	 * the default randomly generated one.
1031 	 */
1032 	if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1033 	    !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1034 		bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1035 		sc->sc_ifaddr = ifs;
1036 	}
1037 
1038 	ifs->if_bridge = sc;
1039 	bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1040 	/*
1041 	 * XXX: XLOCK HERE!?!
1042 	 *
1043 	 * NOTE: insert_***HEAD*** should be safe for the traversals.
1044 	 */
1045 	LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1046 
1047 	/* Set interface capabilities to the intersection set of all members */
1048 	bridge_mutecaps(sc);
1049 
1050 	switch (ifs->if_type) {
1051 	case IFT_ETHER:
1052 	case IFT_L2VLAN:
1053 		/*
1054 		 * Place the interface into promiscuous mode.
1055 		 */
1056 		BRIDGE_UNLOCK(sc);
1057 		error = ifpromisc(ifs, 1);
1058 		BRIDGE_LOCK(sc);
1059 		break;
1060 	}
1061 	if (error)
1062 		bridge_delete_member(sc, bif, 0);
1063 out:
1064 	if (error) {
1065 		if (bif != NULL)
1066 			free(bif, M_DEVBUF);
1067 	}
1068 	return (error);
1069 }
1070 
1071 static int
1072 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1073 {
1074 	struct ifbreq *req = arg;
1075 	struct bridge_iflist *bif;
1076 
1077 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1078 	if (bif == NULL)
1079 		return (ENOENT);
1080 
1081 	bridge_delete_member(sc, bif, 0);
1082 
1083 	return (0);
1084 }
1085 
1086 static int
1087 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1088 {
1089 	struct ifbreq *req = arg;
1090 	struct bridge_iflist *bif;
1091 	struct bstp_port *bp;
1092 
1093 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1094 	if (bif == NULL)
1095 		return (ENOENT);
1096 
1097 	bp = &bif->bif_stp;
1098 	req->ifbr_ifsflags = bif->bif_flags;
1099 	req->ifbr_state = bp->bp_state;
1100 	req->ifbr_priority = bp->bp_priority;
1101 	req->ifbr_path_cost = bp->bp_path_cost;
1102 	req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1103 	req->ifbr_proto = bp->bp_protover;
1104 	req->ifbr_role = bp->bp_role;
1105 	req->ifbr_stpflags = bp->bp_flags;
1106 	req->ifbr_addrcnt = bif->bif_addrcnt;
1107 	req->ifbr_addrmax = bif->bif_addrmax;
1108 	req->ifbr_addrexceeded = bif->bif_addrexceeded;
1109 
1110 	/* Copy STP state options as flags */
1111 	if (bp->bp_operedge)
1112 		req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1113 	if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1114 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1115 	if (bp->bp_ptp_link)
1116 		req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1117 	if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1118 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1119 	if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1120 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1121 	if (bp->bp_flags & BSTP_PORT_ADMCOST)
1122 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1123 	return (0);
1124 }
1125 
1126 static int
1127 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1128 {
1129 	struct ifbreq *req = arg;
1130 	struct bridge_iflist *bif;
1131 	struct bstp_port *bp;
1132 	int error;
1133 
1134 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1135 	if (bif == NULL)
1136 		return (ENOENT);
1137 	bp = &bif->bif_stp;
1138 
1139 	if (req->ifbr_ifsflags & IFBIF_SPAN)
1140 		/* SPAN is readonly */
1141 		return (EINVAL);
1142 
1143 	if (req->ifbr_ifsflags & IFBIF_STP) {
1144 		if ((bif->bif_flags & IFBIF_STP) == 0) {
1145 			error = bstp_enable(&bif->bif_stp);
1146 			if (error)
1147 				return (error);
1148 		}
1149 	} else {
1150 		if ((bif->bif_flags & IFBIF_STP) != 0)
1151 			bstp_disable(&bif->bif_stp);
1152 	}
1153 
1154 	/* Pass on STP flags */
1155 	bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1156 	bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1157 	bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1158 	bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1159 
1160 	/* Save the bits relating to the bridge */
1161 	bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1162 
1163 	return (0);
1164 }
1165 
1166 static int
1167 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1168 {
1169 	struct ifbrparam *param = arg;
1170 
1171 	sc->sc_brtmax = param->ifbrp_csize;
1172 	bridge_rttrim(sc);
1173 
1174 	return (0);
1175 }
1176 
1177 static int
1178 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1179 {
1180 	struct ifbrparam *param = arg;
1181 
1182 	param->ifbrp_csize = sc->sc_brtmax;
1183 
1184 	return (0);
1185 }
1186 
1187 static int
1188 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1189 {
1190 	struct ifbifconf *bifc = arg;
1191 	struct bridge_iflist *bif;
1192 	struct ifbreq breq;
1193 	char *buf, *outbuf;
1194 	int count, buflen, len, error = 0;
1195 
1196 	count = 0;
1197 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1198 		count++;
1199 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1200 		count++;
1201 
1202 	buflen = sizeof(breq) * count;
1203 	if (bifc->ifbic_len == 0) {
1204 		bifc->ifbic_len = buflen;
1205 		return (0);
1206 	}
1207 	BRIDGE_UNLOCK(sc);
1208 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1209 	BRIDGE_LOCK(sc);
1210 
1211 	count = 0;
1212 	buf = outbuf;
1213 	len = min(bifc->ifbic_len, buflen);
1214 	bzero(&breq, sizeof(breq));
1215 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1216 		if (len < sizeof(breq))
1217 			break;
1218 
1219 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1220 		    sizeof(breq.ifbr_ifsname));
1221 		/* Fill in the ifbreq structure */
1222 		error = bridge_ioctl_gifflags(sc, &breq);
1223 		if (error)
1224 			break;
1225 		memcpy(buf, &breq, sizeof(breq));
1226 		count++;
1227 		buf += sizeof(breq);
1228 		len -= sizeof(breq);
1229 	}
1230 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1231 		if (len < sizeof(breq))
1232 			break;
1233 
1234 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1235 		    sizeof(breq.ifbr_ifsname));
1236 		breq.ifbr_ifsflags = bif->bif_flags;
1237 		breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1238 		memcpy(buf, &breq, sizeof(breq));
1239 		count++;
1240 		buf += sizeof(breq);
1241 		len -= sizeof(breq);
1242 	}
1243 
1244 	BRIDGE_UNLOCK(sc);
1245 	bifc->ifbic_len = sizeof(breq) * count;
1246 	error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1247 	BRIDGE_LOCK(sc);
1248 	free(outbuf, M_TEMP);
1249 	return (error);
1250 }
1251 
1252 static int
1253 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1254 {
1255 	struct ifbaconf *bac = arg;
1256 	struct bridge_rtnode *brt;
1257 	struct ifbareq bareq;
1258 	char *buf, *outbuf;
1259 	int count, buflen, len, error = 0;
1260 
1261 	if (bac->ifbac_len == 0)
1262 		return (0);
1263 
1264 	count = 0;
1265 	LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1266 		count++;
1267 	buflen = sizeof(bareq) * count;
1268 
1269 	BRIDGE_UNLOCK(sc);
1270 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1271 	BRIDGE_LOCK(sc);
1272 
1273 	count = 0;
1274 	buf = outbuf;
1275 	len = min(bac->ifbac_len, buflen);
1276 	bzero(&bareq, sizeof(bareq));
1277 	LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1278 		if (len < sizeof(bareq))
1279 			goto out;
1280 		strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1281 		    sizeof(bareq.ifba_ifsname));
1282 		memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1283 		bareq.ifba_vlan = brt->brt_vlan;
1284 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1285 				time_uptime < brt->brt_expire)
1286 			bareq.ifba_expire = brt->brt_expire - time_uptime;
1287 		else
1288 			bareq.ifba_expire = 0;
1289 		bareq.ifba_flags = brt->brt_flags;
1290 
1291 		memcpy(buf, &bareq, sizeof(bareq));
1292 		count++;
1293 		buf += sizeof(bareq);
1294 		len -= sizeof(bareq);
1295 	}
1296 out:
1297 	BRIDGE_UNLOCK(sc);
1298 	bac->ifbac_len = sizeof(bareq) * count;
1299 	error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1300 	BRIDGE_LOCK(sc);
1301 	free(outbuf, M_TEMP);
1302 	return (error);
1303 }
1304 
1305 static int
1306 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1307 {
1308 	struct ifbareq *req = arg;
1309 	struct bridge_iflist *bif;
1310 	int error;
1311 
1312 	bif = bridge_lookup_member(sc, req->ifba_ifsname);
1313 	if (bif == NULL)
1314 		return (ENOENT);
1315 
1316 	error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1317 	    req->ifba_flags);
1318 
1319 	return (error);
1320 }
1321 
1322 static int
1323 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1324 {
1325 	struct ifbrparam *param = arg;
1326 
1327 	sc->sc_brttimeout = param->ifbrp_ctime;
1328 	return (0);
1329 }
1330 
1331 static int
1332 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1333 {
1334 	struct ifbrparam *param = arg;
1335 
1336 	param->ifbrp_ctime = sc->sc_brttimeout;
1337 	return (0);
1338 }
1339 
1340 static int
1341 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1342 {
1343 	struct ifbareq *req = arg;
1344 
1345 	return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1346 }
1347 
1348 static int
1349 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1350 {
1351 	struct ifbreq *req = arg;
1352 
1353 	bridge_rtflush(sc, req->ifbr_ifsflags);
1354 	return (0);
1355 }
1356 
1357 static int
1358 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1359 {
1360 	struct ifbrparam *param = arg;
1361 	struct bstp_state *bs = &sc->sc_stp;
1362 
1363 	param->ifbrp_prio = bs->bs_bridge_priority;
1364 	return (0);
1365 }
1366 
1367 static int
1368 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1369 {
1370 	struct ifbrparam *param = arg;
1371 
1372 	return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1373 }
1374 
1375 static int
1376 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1377 {
1378 	struct ifbrparam *param = arg;
1379 	struct bstp_state *bs = &sc->sc_stp;
1380 
1381 	param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1382 	return (0);
1383 }
1384 
1385 static int
1386 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1387 {
1388 	struct ifbrparam *param = arg;
1389 
1390 	return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1391 }
1392 
1393 static int
1394 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1395 {
1396 	struct ifbrparam *param = arg;
1397 	struct bstp_state *bs = &sc->sc_stp;
1398 
1399 	param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1400 	return (0);
1401 }
1402 
1403 static int
1404 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1405 {
1406 	struct ifbrparam *param = arg;
1407 
1408 	return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1409 }
1410 
1411 static int
1412 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1413 {
1414 	struct ifbrparam *param = arg;
1415 	struct bstp_state *bs = &sc->sc_stp;
1416 
1417 	param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1418 	return (0);
1419 }
1420 
1421 static int
1422 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1423 {
1424 	struct ifbrparam *param = arg;
1425 
1426 	return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1427 }
1428 
1429 static int
1430 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1431 {
1432 	struct ifbreq *req = arg;
1433 	struct bridge_iflist *bif;
1434 
1435 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1436 	if (bif == NULL)
1437 		return (ENOENT);
1438 
1439 	return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1440 }
1441 
1442 static int
1443 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1444 {
1445 	struct ifbreq *req = arg;
1446 	struct bridge_iflist *bif;
1447 
1448 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1449 	if (bif == NULL)
1450 		return (ENOENT);
1451 
1452 	return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1453 }
1454 
1455 static int
1456 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1457 {
1458 	struct ifbreq *req = arg;
1459 	struct bridge_iflist *bif;
1460 
1461 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1462 	if (bif == NULL)
1463 		return (ENOENT);
1464 
1465 	bif->bif_addrmax = req->ifbr_addrmax;
1466 	return (0);
1467 }
1468 
1469 static int
1470 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1471 {
1472 	struct ifbreq *req = arg;
1473 	struct bridge_iflist *bif = NULL;
1474 	struct ifnet *ifs;
1475 
1476 	ifs = ifunit(req->ifbr_ifsname);
1477 	if (ifs == NULL)
1478 		return (ENOENT);
1479 
1480 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1481 		if (ifs == bif->bif_ifp)
1482 			return (EBUSY);
1483 
1484 	if (ifs->if_bridge != NULL)
1485 		return (EBUSY);
1486 
1487 	switch (ifs->if_type) {
1488 		case IFT_ETHER:
1489 		case IFT_GIF:
1490 		case IFT_L2VLAN:
1491 			break;
1492 		default:
1493 			return (EINVAL);
1494 	}
1495 
1496 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1497 	if (bif == NULL)
1498 		return (ENOMEM);
1499 
1500 	bif->bif_ifp = ifs;
1501 	bif->bif_flags = IFBIF_SPAN;
1502 
1503 	LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1504 
1505 	return (0);
1506 }
1507 
1508 static int
1509 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1510 {
1511 	struct ifbreq *req = arg;
1512 	struct bridge_iflist *bif;
1513 	struct ifnet *ifs;
1514 
1515 	ifs = ifunit(req->ifbr_ifsname);
1516 	if (ifs == NULL)
1517 		return (ENOENT);
1518 
1519 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1520 		if (ifs == bif->bif_ifp)
1521 			break;
1522 
1523 	if (bif == NULL)
1524 		return (ENOENT);
1525 
1526 	bridge_delete_span(sc, bif);
1527 
1528 	return (0);
1529 }
1530 
1531 static int
1532 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1533 {
1534 	struct ifbropreq *req = arg;
1535 	struct bstp_state *bs = &sc->sc_stp;
1536 	struct bstp_port *root_port;
1537 
1538 	req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1539 	req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1540 	req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1541 
1542 	root_port = bs->bs_root_port;
1543 	if (root_port == NULL)
1544 		req->ifbop_root_port = 0;
1545 	else
1546 		req->ifbop_root_port = root_port->bp_ifp->if_index;
1547 
1548 	req->ifbop_holdcount = bs->bs_txholdcount;
1549 	req->ifbop_priority = bs->bs_bridge_priority;
1550 	req->ifbop_protocol = bs->bs_protover;
1551 	req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1552 	req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1553 	req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1554 	req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1555 	req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1556 	req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1557 
1558 	return (0);
1559 }
1560 
1561 static int
1562 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1563 {
1564 	struct ifbrparam *param = arg;
1565 
1566 	param->ifbrp_cexceeded = sc->sc_brtexceeded;
1567 	return (0);
1568 }
1569 
1570 static int
1571 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1572 {
1573 	struct ifbpstpconf *bifstp = arg;
1574 	struct bridge_iflist *bif;
1575 	struct bstp_port *bp;
1576 	struct ifbpstpreq bpreq;
1577 	char *buf, *outbuf;
1578 	int count, buflen, len, error = 0;
1579 
1580 	count = 0;
1581 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1582 		if ((bif->bif_flags & IFBIF_STP) != 0)
1583 			count++;
1584 	}
1585 
1586 	buflen = sizeof(bpreq) * count;
1587 	if (bifstp->ifbpstp_len == 0) {
1588 		bifstp->ifbpstp_len = buflen;
1589 		return (0);
1590 	}
1591 
1592 	BRIDGE_UNLOCK(sc);
1593 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1594 	BRIDGE_LOCK(sc);
1595 
1596 	count = 0;
1597 	buf = outbuf;
1598 	len = min(bifstp->ifbpstp_len, buflen);
1599 	bzero(&bpreq, sizeof(bpreq));
1600 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1601 		if (len < sizeof(bpreq))
1602 			break;
1603 
1604 		if ((bif->bif_flags & IFBIF_STP) == 0)
1605 			continue;
1606 
1607 		bp = &bif->bif_stp;
1608 		bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1609 		bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1610 		bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1611 		bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1612 		bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1613 		bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1614 
1615 		memcpy(buf, &bpreq, sizeof(bpreq));
1616 		count++;
1617 		buf += sizeof(bpreq);
1618 		len -= sizeof(bpreq);
1619 	}
1620 
1621 	BRIDGE_UNLOCK(sc);
1622 	bifstp->ifbpstp_len = sizeof(bpreq) * count;
1623 	error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1624 	BRIDGE_LOCK(sc);
1625 	free(outbuf, M_TEMP);
1626 	return (error);
1627 }
1628 
1629 static int
1630 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1631 {
1632 	struct ifbrparam *param = arg;
1633 
1634 	return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1635 }
1636 
1637 static int
1638 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1639 {
1640 	struct ifbrparam *param = arg;
1641 
1642 	return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1643 }
1644 
1645 /*
1646  * bridge_ifdetach:
1647  *
1648  *	Detach an interface from a bridge.  Called when a member
1649  *	interface is detaching.
1650  */
1651 static void
1652 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1653 {
1654 	struct bridge_softc *sc = ifp->if_bridge;
1655 	struct bridge_iflist *bif;
1656 
1657 	/* Check if the interface is a bridge member */
1658 	if (sc != NULL) {
1659 		BRIDGE_LOCK(sc);
1660 
1661 		bif = bridge_lookup_member_if(sc, ifp);
1662 		if (bif != NULL)
1663 			bridge_delete_member(sc, bif, 1);
1664 
1665 		BRIDGE_UNLOCK(sc);
1666 		return;
1667 	}
1668 
1669 	/* Check if the interface is a span port */
1670 	mtx_lock(&bridge_list_mtx);
1671 	LIST_FOREACH(sc, &bridge_list, sc_list) {
1672 		BRIDGE_LOCK(sc);
1673 		LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1674 			if (ifp == bif->bif_ifp) {
1675 				bridge_delete_span(sc, bif);
1676 				break;
1677 			}
1678 
1679 		BRIDGE_UNLOCK(sc);
1680 	}
1681 	mtx_unlock(&bridge_list_mtx);
1682 }
1683 
1684 /*
1685  * bridge_init:
1686  *
1687  *	Initialize a bridge interface.
1688  */
1689 static void
1690 bridge_init(void *xsc)
1691 {
1692 	struct bridge_softc *sc = (struct bridge_softc *)xsc;
1693 	struct ifnet *ifp = sc->sc_ifp;
1694 
1695 	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1696 		return;
1697 
1698 	BRIDGE_LOCK(sc);
1699 	callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1700 	    bridge_timer, sc);
1701 
1702 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
1703 	bstp_init(&sc->sc_stp);		/* Initialize Spanning Tree */
1704 
1705 	BRIDGE_UNLOCK(sc);
1706 }
1707 
1708 /*
1709  * bridge_stop:
1710  *
1711  *	Stop the bridge interface.
1712  */
1713 static void
1714 bridge_stop(struct ifnet *ifp, int disable)
1715 {
1716 	struct bridge_softc *sc = ifp->if_softc;
1717 
1718 	BRIDGE_LOCK_ASSERT(sc);
1719 
1720 	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1721 		return;
1722 
1723 	callout_stop(&sc->sc_brcallout);
1724 	bstp_stop(&sc->sc_stp);
1725 
1726 	bridge_rtflush(sc, IFBF_FLUSHDYN);
1727 
1728 	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1729 }
1730 
1731 /*
1732  * bridge_enqueue:
1733  *
1734  *	Enqueue a packet on a bridge member interface.
1735  *
1736  */
1737 static void
1738 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1739 {
1740 	int len, err = 0;
1741 	short mflags;
1742 	struct mbuf *m0;
1743 
1744 	len = m->m_pkthdr.len;
1745 	mflags = m->m_flags;
1746 
1747 	/* We may be sending a fragment so traverse the mbuf */
1748 	for (; m; m = m0) {
1749 		m0 = m->m_nextpkt;
1750 		m->m_nextpkt = NULL;
1751 
1752 		/*
1753 		 * If underlying interface can not do VLAN tag insertion itself
1754 		 * then attach a packet tag that holds it.
1755 		 */
1756 		if ((m->m_flags & M_VLANTAG) &&
1757 		    (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1758 			m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1759 			if (m == NULL) {
1760 				if_printf(dst_ifp,
1761 				    "unable to prepend VLAN header\n");
1762 				dst_ifp->if_oerrors++;
1763 				continue;
1764 			}
1765 			m->m_flags &= ~M_VLANTAG;
1766 		}
1767 
1768 		if (err == 0)
1769 			dst_ifp->if_transmit(dst_ifp, m);
1770 	}
1771 
1772 	if (err == 0) {
1773 		sc->sc_ifp->if_opackets++;
1774 		sc->sc_ifp->if_obytes += len;
1775 		if (mflags & M_MCAST)
1776 			sc->sc_ifp->if_omcasts++;
1777 	}
1778 }
1779 
1780 /*
1781  * bridge_dummynet:
1782  *
1783  * 	Receive a queued packet from dummynet and pass it on to the output
1784  * 	interface.
1785  *
1786  *	The mbuf has the Ethernet header already attached.
1787  */
1788 static void
1789 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1790 {
1791 	struct bridge_softc *sc;
1792 
1793 	sc = ifp->if_bridge;
1794 
1795 	/*
1796 	 * The packet didnt originate from a member interface. This should only
1797 	 * ever happen if a member interface is removed while packets are
1798 	 * queued for it.
1799 	 */
1800 	if (sc == NULL) {
1801 		m_freem(m);
1802 		return;
1803 	}
1804 
1805 	if (PFIL_HOOKED(&inet_pfil_hook)
1806 #ifdef INET6
1807 	    || PFIL_HOOKED(&inet6_pfil_hook)
1808 #endif
1809 	    ) {
1810 		if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1811 			return;
1812 		if (m == NULL)
1813 			return;
1814 	}
1815 
1816 	bridge_enqueue(sc, ifp, m);
1817 }
1818 
1819 /*
1820  * bridge_output:
1821  *
1822  *	Send output from a bridge member interface.  This
1823  *	performs the bridging function for locally originated
1824  *	packets.
1825  *
1826  *	The mbuf has the Ethernet header already attached.  We must
1827  *	enqueue or free the mbuf before returning.
1828  */
1829 static int
1830 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1831     struct rtentry *rt)
1832 {
1833 	struct ether_header *eh;
1834 	struct ifnet *dst_if;
1835 	struct bridge_softc *sc;
1836 	uint16_t vlan;
1837 
1838 	if (m->m_len < ETHER_HDR_LEN) {
1839 		m = m_pullup(m, ETHER_HDR_LEN);
1840 		if (m == NULL)
1841 			return (0);
1842 	}
1843 
1844 	eh = mtod(m, struct ether_header *);
1845 	sc = ifp->if_bridge;
1846 	vlan = VLANTAGOF(m);
1847 
1848 	BRIDGE_LOCK(sc);
1849 
1850 	/*
1851 	 * If bridge is down, but the original output interface is up,
1852 	 * go ahead and send out that interface.  Otherwise, the packet
1853 	 * is dropped below.
1854 	 */
1855 	if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1856 		dst_if = ifp;
1857 		goto sendunicast;
1858 	}
1859 
1860 	/*
1861 	 * If the packet is a multicast, or we don't know a better way to
1862 	 * get there, send to all interfaces.
1863 	 */
1864 	if (ETHER_IS_MULTICAST(eh->ether_dhost))
1865 		dst_if = NULL;
1866 	else
1867 		dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1868 	if (dst_if == NULL) {
1869 		struct bridge_iflist *bif;
1870 		struct mbuf *mc;
1871 		int error = 0, used = 0;
1872 
1873 		bridge_span(sc, m);
1874 
1875 		BRIDGE_LOCK2REF(sc, error);
1876 		if (error) {
1877 			m_freem(m);
1878 			return (0);
1879 		}
1880 
1881 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1882 			dst_if = bif->bif_ifp;
1883 
1884 			if (dst_if->if_type == IFT_GIF)
1885 				continue;
1886 			if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1887 				continue;
1888 
1889 			/*
1890 			 * If this is not the original output interface,
1891 			 * and the interface is participating in spanning
1892 			 * tree, make sure the port is in a state that
1893 			 * allows forwarding.
1894 			 */
1895 			if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1896 			    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1897 				continue;
1898 
1899 			if (LIST_NEXT(bif, bif_next) == NULL) {
1900 				used = 1;
1901 				mc = m;
1902 			} else {
1903 				mc = m_copypacket(m, M_DONTWAIT);
1904 				if (mc == NULL) {
1905 					sc->sc_ifp->if_oerrors++;
1906 					continue;
1907 				}
1908 			}
1909 
1910 			bridge_enqueue(sc, dst_if, mc);
1911 		}
1912 		if (used == 0)
1913 			m_freem(m);
1914 		BRIDGE_UNREF(sc);
1915 		return (0);
1916 	}
1917 
1918 sendunicast:
1919 	/*
1920 	 * XXX Spanning tree consideration here?
1921 	 */
1922 
1923 	bridge_span(sc, m);
1924 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1925 		m_freem(m);
1926 		BRIDGE_UNLOCK(sc);
1927 		return (0);
1928 	}
1929 
1930 	BRIDGE_UNLOCK(sc);
1931 	bridge_enqueue(sc, dst_if, m);
1932 	return (0);
1933 }
1934 
1935 /*
1936  * bridge_start:
1937  *
1938  *	Start output on a bridge.
1939  *
1940  */
1941 static void
1942 bridge_start(struct ifnet *ifp)
1943 {
1944 	struct bridge_softc *sc;
1945 	struct mbuf *m;
1946 	struct ether_header *eh;
1947 	struct ifnet *dst_if;
1948 
1949 	sc = ifp->if_softc;
1950 
1951 	ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1952 	for (;;) {
1953 		IFQ_DEQUEUE(&ifp->if_snd, m);
1954 		if (m == 0)
1955 			break;
1956 		ETHER_BPF_MTAP(ifp, m);
1957 
1958 		eh = mtod(m, struct ether_header *);
1959 		dst_if = NULL;
1960 
1961 		BRIDGE_LOCK(sc);
1962 		if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
1963 			dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1);
1964 		}
1965 
1966 		if (dst_if == NULL)
1967 			bridge_broadcast(sc, ifp, m, 0);
1968 		else {
1969 			BRIDGE_UNLOCK(sc);
1970 			bridge_enqueue(sc, dst_if, m);
1971 		}
1972 	}
1973 	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1974 }
1975 
1976 /*
1977  * bridge_forward:
1978  *
1979  *	The forwarding function of the bridge.
1980  *
1981  *	NOTE: Releases the lock on return.
1982  */
1983 static void
1984 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
1985     struct mbuf *m)
1986 {
1987 	struct bridge_iflist *dbif;
1988 	struct ifnet *src_if, *dst_if, *ifp;
1989 	struct ether_header *eh;
1990 	uint16_t vlan;
1991 	uint8_t *dst;
1992 	int error;
1993 
1994 	src_if = m->m_pkthdr.rcvif;
1995 	ifp = sc->sc_ifp;
1996 
1997 	ifp->if_ipackets++;
1998 	ifp->if_ibytes += m->m_pkthdr.len;
1999 	vlan = VLANTAGOF(m);
2000 
2001 	if ((sbif->bif_flags & IFBIF_STP) &&
2002 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2003 		goto drop;
2004 
2005 	eh = mtod(m, struct ether_header *);
2006 	dst = eh->ether_dhost;
2007 
2008 	/* If the interface is learning, record the address. */
2009 	if (sbif->bif_flags & IFBIF_LEARNING) {
2010 		error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2011 		    sbif, 0, IFBAF_DYNAMIC);
2012 		/*
2013 		 * If the interface has addresses limits then deny any source
2014 		 * that is not in the cache.
2015 		 */
2016 		if (error && sbif->bif_addrmax)
2017 			goto drop;
2018 	}
2019 
2020 	if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2021 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2022 		goto drop;
2023 
2024 	/*
2025 	 * At this point, the port either doesn't participate
2026 	 * in spanning tree or it is in the forwarding state.
2027 	 */
2028 
2029 	/*
2030 	 * If the packet is unicast, destined for someone on
2031 	 * "this" side of the bridge, drop it.
2032 	 */
2033 	if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2034 		dst_if = bridge_rtlookup(sc, dst, vlan);
2035 		if (src_if == dst_if)
2036 			goto drop;
2037 	} else {
2038 		/*
2039 		 * Check if its a reserved multicast address, any address
2040 		 * listed in 802.1D section 7.12.6 may not be forwarded by the
2041 		 * bridge.
2042 		 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2043 		 */
2044 		if (dst[0] == 0x01 && dst[1] == 0x80 &&
2045 		    dst[2] == 0xc2 && dst[3] == 0x00 &&
2046 		    dst[4] == 0x00 && dst[5] <= 0x0f)
2047 			goto drop;
2048 
2049 		/* ...forward it to all interfaces. */
2050 		ifp->if_imcasts++;
2051 		dst_if = NULL;
2052 	}
2053 
2054 	/*
2055 	 * If we have a destination interface which is a member of our bridge,
2056 	 * OR this is a unicast packet, push it through the bpf(4) machinery.
2057 	 * For broadcast or multicast packets, don't bother because it will
2058 	 * be reinjected into ether_input. We do this before we pass the packets
2059 	 * through the pfil(9) framework, as it is possible that pfil(9) will
2060 	 * drop the packet, or possibly modify it, making it difficult to debug
2061 	 * firewall issues on the bridge.
2062 	 */
2063 	if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2064 		ETHER_BPF_MTAP(ifp, m);
2065 
2066 	/* run the packet filter */
2067 	if (PFIL_HOOKED(&inet_pfil_hook)
2068 #ifdef INET6
2069 	    || PFIL_HOOKED(&inet6_pfil_hook)
2070 #endif
2071 	    ) {
2072 		BRIDGE_UNLOCK(sc);
2073 		if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2074 			return;
2075 		if (m == NULL)
2076 			return;
2077 		BRIDGE_LOCK(sc);
2078 	}
2079 
2080 	if (dst_if == NULL) {
2081 		bridge_broadcast(sc, src_if, m, 1);
2082 		return;
2083 	}
2084 
2085 	/*
2086 	 * At this point, we're dealing with a unicast frame
2087 	 * going to a different interface.
2088 	 */
2089 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2090 		goto drop;
2091 
2092 	dbif = bridge_lookup_member_if(sc, dst_if);
2093 	if (dbif == NULL)
2094 		/* Not a member of the bridge (anymore?) */
2095 		goto drop;
2096 
2097 	/* Private segments can not talk to each other */
2098 	if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2099 		goto drop;
2100 
2101 	if ((dbif->bif_flags & IFBIF_STP) &&
2102 	    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2103 		goto drop;
2104 
2105 	BRIDGE_UNLOCK(sc);
2106 
2107 	if (PFIL_HOOKED(&inet_pfil_hook)
2108 #ifdef INET6
2109 	    || PFIL_HOOKED(&inet6_pfil_hook)
2110 #endif
2111 	    ) {
2112 		if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2113 			return;
2114 		if (m == NULL)
2115 			return;
2116 	}
2117 
2118 	bridge_enqueue(sc, dst_if, m);
2119 	return;
2120 
2121 drop:
2122 	BRIDGE_UNLOCK(sc);
2123 	m_freem(m);
2124 }
2125 
2126 /*
2127  * bridge_input:
2128  *
2129  *	Receive input from a member interface.  Queue the packet for
2130  *	bridging if it is not for us.
2131  */
2132 static struct mbuf *
2133 bridge_input(struct ifnet *ifp, struct mbuf *m)
2134 {
2135 	struct bridge_softc *sc = ifp->if_bridge;
2136 	struct bridge_iflist *bif, *bif2;
2137 	struct ifnet *bifp;
2138 	struct ether_header *eh;
2139 	struct mbuf *mc, *mc2;
2140 	uint16_t vlan;
2141 	int error;
2142 
2143 	if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2144 		return (m);
2145 
2146 	bifp = sc->sc_ifp;
2147 	vlan = VLANTAGOF(m);
2148 
2149 	/*
2150 	 * Implement support for bridge monitoring. If this flag has been
2151 	 * set on this interface, discard the packet once we push it through
2152 	 * the bpf(4) machinery, but before we do, increment the byte and
2153 	 * packet counters associated with this interface.
2154 	 */
2155 	if ((bifp->if_flags & IFF_MONITOR) != 0) {
2156 		m->m_pkthdr.rcvif  = bifp;
2157 		ETHER_BPF_MTAP(bifp, m);
2158 		bifp->if_ipackets++;
2159 		bifp->if_ibytes += m->m_pkthdr.len;
2160 		m_freem(m);
2161 		return (NULL);
2162 	}
2163 	BRIDGE_LOCK(sc);
2164 	bif = bridge_lookup_member_if(sc, ifp);
2165 	if (bif == NULL) {
2166 		BRIDGE_UNLOCK(sc);
2167 		return (m);
2168 	}
2169 
2170 	eh = mtod(m, struct ether_header *);
2171 
2172 	bridge_span(sc, m);
2173 
2174 	if (m->m_flags & (M_BCAST|M_MCAST)) {
2175 		/* Tap off 802.1D packets; they do not get forwarded. */
2176 		if (memcmp(eh->ether_dhost, bstp_etheraddr,
2177 		    ETHER_ADDR_LEN) == 0) {
2178 			m = bstp_input(&bif->bif_stp, ifp, m);
2179 			if (m == NULL) {
2180 				BRIDGE_UNLOCK(sc);
2181 				return (NULL);
2182 			}
2183 		}
2184 
2185 		if ((bif->bif_flags & IFBIF_STP) &&
2186 		    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2187 			BRIDGE_UNLOCK(sc);
2188 			return (m);
2189 		}
2190 
2191 		/*
2192 		 * Make a deep copy of the packet and enqueue the copy
2193 		 * for bridge processing; return the original packet for
2194 		 * local processing.
2195 		 */
2196 		mc = m_dup(m, M_DONTWAIT);
2197 		if (mc == NULL) {
2198 			BRIDGE_UNLOCK(sc);
2199 			return (m);
2200 		}
2201 
2202 		/* Perform the bridge forwarding function with the copy. */
2203 		bridge_forward(sc, bif, mc);
2204 
2205 		/*
2206 		 * Reinject the mbuf as arriving on the bridge so we have a
2207 		 * chance at claiming multicast packets. We can not loop back
2208 		 * here from ether_input as a bridge is never a member of a
2209 		 * bridge.
2210 		 */
2211 		KASSERT(bifp->if_bridge == NULL,
2212 		    ("loop created in bridge_input"));
2213 		mc2 = m_dup(m, M_DONTWAIT);
2214 		if (mc2 != NULL) {
2215 			/* Keep the layer3 header aligned */
2216 			int i = min(mc2->m_pkthdr.len, max_protohdr);
2217 			mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2218 		}
2219 		if (mc2 != NULL) {
2220 			mc2->m_pkthdr.rcvif = bifp;
2221 			(*bifp->if_input)(bifp, mc2);
2222 		}
2223 
2224 		/* Return the original packet for local processing. */
2225 		return (m);
2226 	}
2227 
2228 	if ((bif->bif_flags & IFBIF_STP) &&
2229 	    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2230 		BRIDGE_UNLOCK(sc);
2231 		return (m);
2232 	}
2233 
2234 #ifdef DEV_CARP
2235 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2236 	|| ((iface)->if_carp \
2237 	    && carp_forus((iface)->if_carp, eh->ether_dhost))
2238 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2239 	|| ((iface)->if_carp \
2240 	    && carp_forus((iface)->if_carp, eh->ether_shost))
2241 #else
2242 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2243 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2244 #endif
2245 
2246 #ifdef INET6
2247 #   define OR_PFIL_HOOKED_INET6 \
2248 	|| PFIL_HOOKED(&inet6_pfil_hook)
2249 #else
2250 #   define OR_PFIL_HOOKED_INET6
2251 #endif
2252 
2253 #define GRAB_OUR_PACKETS(iface) \
2254 	if ((iface)->if_type == IFT_GIF) \
2255 		continue; \
2256 	/* It is destined for us. */ \
2257 	if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2258 	    OR_CARP_CHECK_WE_ARE_DST((iface))				\
2259 	    ) {								\
2260 		if ((iface)->if_type == IFT_BRIDGE) {			\
2261 			ETHER_BPF_MTAP(iface, m);			\
2262 			iface->if_ipackets++;				\
2263 			/* Filter on the physical interface. */		\
2264 			if (pfil_local_phys &&				\
2265 			    (PFIL_HOOKED(&inet_pfil_hook)		\
2266 			     OR_PFIL_HOOKED_INET6)) {			\
2267 				if (bridge_pfil(&m, NULL, ifp,		\
2268 				    PFIL_IN) != 0 || m == NULL) {	\
2269 					BRIDGE_UNLOCK(sc);		\
2270 					return (NULL);			\
2271 				}					\
2272 			}						\
2273 		}							\
2274 		if (bif->bif_flags & IFBIF_LEARNING) {			\
2275 			error = bridge_rtupdate(sc, eh->ether_shost,	\
2276 			    vlan, bif, 0, IFBAF_DYNAMIC);		\
2277 			if (error && bif->bif_addrmax) {		\
2278 				BRIDGE_UNLOCK(sc);			\
2279 				m_freem(m);				\
2280 				return (NULL);				\
2281 			}						\
2282 		}							\
2283 		m->m_pkthdr.rcvif = iface;				\
2284 		BRIDGE_UNLOCK(sc);					\
2285 		return (m);						\
2286 	}								\
2287 									\
2288 	/* We just received a packet that we sent out. */		\
2289 	if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2290 	    OR_CARP_CHECK_WE_ARE_SRC((iface))			\
2291 	    ) {								\
2292 		BRIDGE_UNLOCK(sc);					\
2293 		m_freem(m);						\
2294 		return (NULL);						\
2295 	}
2296 
2297 	/*
2298 	 * Unicast.  Make sure it's not for the bridge.
2299 	 */
2300 	do { GRAB_OUR_PACKETS(bifp) } while (0);
2301 
2302 	/*
2303 	 * Give a chance for ifp at first priority. This will help when	the
2304 	 * packet comes through the interface like VLAN's with the same MACs
2305 	 * on several interfaces from the same bridge. This also will save
2306 	 * some CPU cycles in case the destination interface and the input
2307 	 * interface (eq ifp) are the same.
2308 	 */
2309 	do { GRAB_OUR_PACKETS(ifp) } while (0);
2310 
2311 	/* Now check the all bridge members. */
2312 	LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2313 		GRAB_OUR_PACKETS(bif2->bif_ifp)
2314 	}
2315 
2316 #undef OR_CARP_CHECK_WE_ARE_DST
2317 #undef OR_CARP_CHECK_WE_ARE_SRC
2318 #undef OR_PFIL_HOOKED_INET6
2319 #undef GRAB_OUR_PACKETS
2320 
2321 	/* Perform the bridge forwarding function. */
2322 	bridge_forward(sc, bif, m);
2323 
2324 	return (NULL);
2325 }
2326 
2327 /*
2328  * bridge_broadcast:
2329  *
2330  *	Send a frame to all interfaces that are members of
2331  *	the bridge, except for the one on which the packet
2332  *	arrived.
2333  *
2334  *	NOTE: Releases the lock on return.
2335  */
2336 static void
2337 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2338     struct mbuf *m, int runfilt)
2339 {
2340 	struct bridge_iflist *dbif, *sbif;
2341 	struct mbuf *mc;
2342 	struct ifnet *dst_if;
2343 	int error = 0, used = 0, i;
2344 
2345 	sbif = bridge_lookup_member_if(sc, src_if);
2346 
2347 	BRIDGE_LOCK2REF(sc, error);
2348 	if (error) {
2349 		m_freem(m);
2350 		return;
2351 	}
2352 
2353 	/* Filter on the bridge interface before broadcasting */
2354 	if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
2355 #ifdef INET6
2356 	    || PFIL_HOOKED(&inet6_pfil_hook)
2357 #endif
2358 	    )) {
2359 		if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2360 			goto out;
2361 		if (m == NULL)
2362 			goto out;
2363 	}
2364 
2365 	LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2366 		dst_if = dbif->bif_ifp;
2367 		if (dst_if == src_if)
2368 			continue;
2369 
2370 		/* Private segments can not talk to each other */
2371 		if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2372 			continue;
2373 
2374 		if ((dbif->bif_flags & IFBIF_STP) &&
2375 		    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2376 			continue;
2377 
2378 		if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2379 		    (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2380 			continue;
2381 
2382 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2383 			continue;
2384 
2385 		if (LIST_NEXT(dbif, bif_next) == NULL) {
2386 			mc = m;
2387 			used = 1;
2388 		} else {
2389 			mc = m_dup(m, M_DONTWAIT);
2390 			if (mc == NULL) {
2391 				sc->sc_ifp->if_oerrors++;
2392 				continue;
2393 			}
2394 		}
2395 
2396 		/*
2397 		 * Filter on the output interface. Pass a NULL bridge interface
2398 		 * pointer so we do not redundantly filter on the bridge for
2399 		 * each interface we broadcast on.
2400 		 */
2401 		if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
2402 #ifdef INET6
2403 		    || PFIL_HOOKED(&inet6_pfil_hook)
2404 #endif
2405 		    )) {
2406 			if (used == 0) {
2407 				/* Keep the layer3 header aligned */
2408 				i = min(mc->m_pkthdr.len, max_protohdr);
2409 				mc = m_copyup(mc, i, ETHER_ALIGN);
2410 				if (mc == NULL) {
2411 					sc->sc_ifp->if_oerrors++;
2412 					continue;
2413 				}
2414 			}
2415 			if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2416 				continue;
2417 			if (mc == NULL)
2418 				continue;
2419 		}
2420 
2421 		bridge_enqueue(sc, dst_if, mc);
2422 	}
2423 	if (used == 0)
2424 		m_freem(m);
2425 
2426 out:
2427 	BRIDGE_UNREF(sc);
2428 }
2429 
2430 /*
2431  * bridge_span:
2432  *
2433  *	Duplicate a packet out one or more interfaces that are in span mode,
2434  *	the original mbuf is unmodified.
2435  */
2436 static void
2437 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2438 {
2439 	struct bridge_iflist *bif;
2440 	struct ifnet *dst_if;
2441 	struct mbuf *mc;
2442 
2443 	if (LIST_EMPTY(&sc->sc_spanlist))
2444 		return;
2445 
2446 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2447 		dst_if = bif->bif_ifp;
2448 
2449 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2450 			continue;
2451 
2452 		mc = m_copypacket(m, M_DONTWAIT);
2453 		if (mc == NULL) {
2454 			sc->sc_ifp->if_oerrors++;
2455 			continue;
2456 		}
2457 
2458 		bridge_enqueue(sc, dst_if, mc);
2459 	}
2460 }
2461 
2462 /*
2463  * bridge_rtupdate:
2464  *
2465  *	Add a bridge routing entry.
2466  */
2467 static int
2468 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2469     struct bridge_iflist *bif, int setflags, uint8_t flags)
2470 {
2471 	struct bridge_rtnode *brt;
2472 	int error;
2473 
2474 	BRIDGE_LOCK_ASSERT(sc);
2475 
2476 	/* Check the source address is valid and not multicast. */
2477 	if (ETHER_IS_MULTICAST(dst) ||
2478 	    (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2479 	     dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2480 		return (EINVAL);
2481 
2482 	/* 802.1p frames map to vlan 1 */
2483 	if (vlan == 0)
2484 		vlan = 1;
2485 
2486 	/*
2487 	 * A route for this destination might already exist.  If so,
2488 	 * update it, otherwise create a new one.
2489 	 */
2490 	if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2491 		if (sc->sc_brtcnt >= sc->sc_brtmax) {
2492 			sc->sc_brtexceeded++;
2493 			return (ENOSPC);
2494 		}
2495 		/* Check per interface address limits (if enabled) */
2496 		if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2497 			bif->bif_addrexceeded++;
2498 			return (ENOSPC);
2499 		}
2500 
2501 		/*
2502 		 * Allocate a new bridge forwarding node, and
2503 		 * initialize the expiration time and Ethernet
2504 		 * address.
2505 		 */
2506 		brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2507 		if (brt == NULL)
2508 			return (ENOMEM);
2509 
2510 		if (bif->bif_flags & IFBIF_STICKY)
2511 			brt->brt_flags = IFBAF_STICKY;
2512 		else
2513 			brt->brt_flags = IFBAF_DYNAMIC;
2514 
2515 		memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2516 		brt->brt_vlan = vlan;
2517 
2518 		if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2519 			uma_zfree(bridge_rtnode_zone, brt);
2520 			return (error);
2521 		}
2522 		brt->brt_dst = bif;
2523 		bif->bif_addrcnt++;
2524 	}
2525 
2526 	if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2527 	    brt->brt_dst != bif) {
2528 		brt->brt_dst->bif_addrcnt--;
2529 		brt->brt_dst = bif;
2530 		brt->brt_dst->bif_addrcnt++;
2531 	}
2532 
2533 	if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2534 		brt->brt_expire = time_uptime + sc->sc_brttimeout;
2535 	if (setflags)
2536 		brt->brt_flags = flags;
2537 
2538 	return (0);
2539 }
2540 
2541 /*
2542  * bridge_rtlookup:
2543  *
2544  *	Lookup the destination interface for an address.
2545  */
2546 static struct ifnet *
2547 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2548 {
2549 	struct bridge_rtnode *brt;
2550 
2551 	BRIDGE_LOCK_ASSERT(sc);
2552 
2553 	if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2554 		return (NULL);
2555 
2556 	return (brt->brt_ifp);
2557 }
2558 
2559 /*
2560  * bridge_rttrim:
2561  *
2562  *	Trim the routine table so that we have a number
2563  *	of routing entries less than or equal to the
2564  *	maximum number.
2565  */
2566 static void
2567 bridge_rttrim(struct bridge_softc *sc)
2568 {
2569 	struct bridge_rtnode *brt, *nbrt;
2570 
2571 	BRIDGE_LOCK_ASSERT(sc);
2572 
2573 	/* Make sure we actually need to do this. */
2574 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2575 		return;
2576 
2577 	/* Force an aging cycle; this might trim enough addresses. */
2578 	bridge_rtage(sc);
2579 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2580 		return;
2581 
2582 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2583 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2584 			bridge_rtnode_destroy(sc, brt);
2585 			if (sc->sc_brtcnt <= sc->sc_brtmax)
2586 				return;
2587 		}
2588 	}
2589 }
2590 
2591 /*
2592  * bridge_timer:
2593  *
2594  *	Aging timer for the bridge.
2595  */
2596 static void
2597 bridge_timer(void *arg)
2598 {
2599 	struct bridge_softc *sc = arg;
2600 
2601 	BRIDGE_LOCK_ASSERT(sc);
2602 
2603 	bridge_rtage(sc);
2604 
2605 	if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2606 		callout_reset(&sc->sc_brcallout,
2607 		    bridge_rtable_prune_period * hz, bridge_timer, sc);
2608 }
2609 
2610 /*
2611  * bridge_rtage:
2612  *
2613  *	Perform an aging cycle.
2614  */
2615 static void
2616 bridge_rtage(struct bridge_softc *sc)
2617 {
2618 	struct bridge_rtnode *brt, *nbrt;
2619 
2620 	BRIDGE_LOCK_ASSERT(sc);
2621 
2622 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2623 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2624 			if (time_uptime >= brt->brt_expire)
2625 				bridge_rtnode_destroy(sc, brt);
2626 		}
2627 	}
2628 }
2629 
2630 /*
2631  * bridge_rtflush:
2632  *
2633  *	Remove all dynamic addresses from the bridge.
2634  */
2635 static void
2636 bridge_rtflush(struct bridge_softc *sc, int full)
2637 {
2638 	struct bridge_rtnode *brt, *nbrt;
2639 
2640 	BRIDGE_LOCK_ASSERT(sc);
2641 
2642 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2643 		if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2644 			bridge_rtnode_destroy(sc, brt);
2645 	}
2646 }
2647 
2648 /*
2649  * bridge_rtdaddr:
2650  *
2651  *	Remove an address from the table.
2652  */
2653 static int
2654 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2655 {
2656 	struct bridge_rtnode *brt;
2657 	int found = 0;
2658 
2659 	BRIDGE_LOCK_ASSERT(sc);
2660 
2661 	/*
2662 	 * If vlan is zero then we want to delete for all vlans so the lookup
2663 	 * may return more than one.
2664 	 */
2665 	while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2666 		bridge_rtnode_destroy(sc, brt);
2667 		found = 1;
2668 	}
2669 
2670 	return (found ? 0 : ENOENT);
2671 }
2672 
2673 /*
2674  * bridge_rtdelete:
2675  *
2676  *	Delete routes to a speicifc member interface.
2677  */
2678 static void
2679 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2680 {
2681 	struct bridge_rtnode *brt, *nbrt;
2682 
2683 	BRIDGE_LOCK_ASSERT(sc);
2684 
2685 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2686 		if (brt->brt_ifp == ifp && (full ||
2687 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2688 			bridge_rtnode_destroy(sc, brt);
2689 	}
2690 }
2691 
2692 /*
2693  * bridge_rtable_init:
2694  *
2695  *	Initialize the route table for this bridge.
2696  */
2697 static int
2698 bridge_rtable_init(struct bridge_softc *sc)
2699 {
2700 	int i;
2701 
2702 	sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2703 	    M_DEVBUF, M_NOWAIT);
2704 	if (sc->sc_rthash == NULL)
2705 		return (ENOMEM);
2706 
2707 	for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2708 		LIST_INIT(&sc->sc_rthash[i]);
2709 
2710 	sc->sc_rthash_key = arc4random();
2711 
2712 	LIST_INIT(&sc->sc_rtlist);
2713 
2714 	return (0);
2715 }
2716 
2717 /*
2718  * bridge_rtable_fini:
2719  *
2720  *	Deconstruct the route table for this bridge.
2721  */
2722 static void
2723 bridge_rtable_fini(struct bridge_softc *sc)
2724 {
2725 
2726 	KASSERT(sc->sc_brtcnt == 0,
2727 	    ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2728 	free(sc->sc_rthash, M_DEVBUF);
2729 }
2730 
2731 /*
2732  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2733  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2734  */
2735 #define	mix(a, b, c)							\
2736 do {									\
2737 	a -= b; a -= c; a ^= (c >> 13);					\
2738 	b -= c; b -= a; b ^= (a << 8);					\
2739 	c -= a; c -= b; c ^= (b >> 13);					\
2740 	a -= b; a -= c; a ^= (c >> 12);					\
2741 	b -= c; b -= a; b ^= (a << 16);					\
2742 	c -= a; c -= b; c ^= (b >> 5);					\
2743 	a -= b; a -= c; a ^= (c >> 3);					\
2744 	b -= c; b -= a; b ^= (a << 10);					\
2745 	c -= a; c -= b; c ^= (b >> 15);					\
2746 } while (/*CONSTCOND*/0)
2747 
2748 static __inline uint32_t
2749 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2750 {
2751 	uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2752 
2753 	b += addr[5] << 8;
2754 	b += addr[4];
2755 	a += addr[3] << 24;
2756 	a += addr[2] << 16;
2757 	a += addr[1] << 8;
2758 	a += addr[0];
2759 
2760 	mix(a, b, c);
2761 
2762 	return (c & BRIDGE_RTHASH_MASK);
2763 }
2764 
2765 #undef mix
2766 
2767 static int
2768 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2769 {
2770 	int i, d;
2771 
2772 	for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2773 		d = ((int)a[i]) - ((int)b[i]);
2774 	}
2775 
2776 	return (d);
2777 }
2778 
2779 /*
2780  * bridge_rtnode_lookup:
2781  *
2782  *	Look up a bridge route node for the specified destination. Compare the
2783  *	vlan id or if zero then just return the first match.
2784  */
2785 static struct bridge_rtnode *
2786 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2787 {
2788 	struct bridge_rtnode *brt;
2789 	uint32_t hash;
2790 	int dir;
2791 
2792 	BRIDGE_LOCK_ASSERT(sc);
2793 
2794 	hash = bridge_rthash(sc, addr);
2795 	LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2796 		dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2797 		if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2798 			return (brt);
2799 		if (dir > 0)
2800 			return (NULL);
2801 	}
2802 
2803 	return (NULL);
2804 }
2805 
2806 /*
2807  * bridge_rtnode_insert:
2808  *
2809  *	Insert the specified bridge node into the route table.  We
2810  *	assume the entry is not already in the table.
2811  */
2812 static int
2813 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2814 {
2815 	struct bridge_rtnode *lbrt;
2816 	uint32_t hash;
2817 	int dir;
2818 
2819 	BRIDGE_LOCK_ASSERT(sc);
2820 
2821 	hash = bridge_rthash(sc, brt->brt_addr);
2822 
2823 	lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2824 	if (lbrt == NULL) {
2825 		LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2826 		goto out;
2827 	}
2828 
2829 	do {
2830 		dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2831 		if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2832 			return (EEXIST);
2833 		if (dir > 0) {
2834 			LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2835 			goto out;
2836 		}
2837 		if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2838 			LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2839 			goto out;
2840 		}
2841 		lbrt = LIST_NEXT(lbrt, brt_hash);
2842 	} while (lbrt != NULL);
2843 
2844 #ifdef DIAGNOSTIC
2845 	panic("bridge_rtnode_insert: impossible");
2846 #endif
2847 
2848 out:
2849 	LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2850 	sc->sc_brtcnt++;
2851 
2852 	return (0);
2853 }
2854 
2855 /*
2856  * bridge_rtnode_destroy:
2857  *
2858  *	Destroy a bridge rtnode.
2859  */
2860 static void
2861 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2862 {
2863 	BRIDGE_LOCK_ASSERT(sc);
2864 
2865 	LIST_REMOVE(brt, brt_hash);
2866 
2867 	LIST_REMOVE(brt, brt_list);
2868 	sc->sc_brtcnt--;
2869 	brt->brt_dst->bif_addrcnt--;
2870 	uma_zfree(bridge_rtnode_zone, brt);
2871 }
2872 
2873 /*
2874  * bridge_rtable_expire:
2875  *
2876  *	Set the expiry time for all routes on an interface.
2877  */
2878 static void
2879 bridge_rtable_expire(struct ifnet *ifp, int age)
2880 {
2881 	struct bridge_softc *sc = ifp->if_bridge;
2882 	struct bridge_rtnode *brt;
2883 
2884 	BRIDGE_LOCK(sc);
2885 
2886 	/*
2887 	 * If the age is zero then flush, otherwise set all the expiry times to
2888 	 * age for the interface
2889 	 */
2890 	if (age == 0)
2891 		bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2892 	else {
2893 		LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2894 			/* Cap the expiry time to 'age' */
2895 			if (brt->brt_ifp == ifp &&
2896 			    brt->brt_expire > time_uptime + age &&
2897 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2898 				brt->brt_expire = time_uptime + age;
2899 		}
2900 	}
2901 	BRIDGE_UNLOCK(sc);
2902 }
2903 
2904 /*
2905  * bridge_state_change:
2906  *
2907  *	Callback from the bridgestp code when a port changes states.
2908  */
2909 static void
2910 bridge_state_change(struct ifnet *ifp, int state)
2911 {
2912 	struct bridge_softc *sc = ifp->if_bridge;
2913 	static const char *stpstates[] = {
2914 		"disabled",
2915 		"listening",
2916 		"learning",
2917 		"forwarding",
2918 		"blocking",
2919 		"discarding"
2920 	};
2921 
2922 	if (log_stp)
2923 		log(LOG_NOTICE, "%s: state changed to %s on %s\n",
2924 		    sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
2925 }
2926 
2927 /*
2928  * Send bridge packets through pfil if they are one of the types pfil can deal
2929  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
2930  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2931  * that interface.
2932  */
2933 static int
2934 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2935 {
2936 	int snap, error, i, hlen;
2937 	struct ether_header *eh1, eh2;
2938 	struct ip_fw_args args;
2939 	struct ip *ip;
2940 	struct llc llc1;
2941 	u_int16_t ether_type;
2942 
2943 	snap = 0;
2944 	error = -1;	/* Default error if not error == 0 */
2945 
2946 #if 0
2947 	/* we may return with the IP fields swapped, ensure its not shared */
2948 	KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
2949 #endif
2950 
2951 	if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
2952 		return (0); /* filtering is disabled */
2953 
2954 	i = min((*mp)->m_pkthdr.len, max_protohdr);
2955 	if ((*mp)->m_len < i) {
2956 	    *mp = m_pullup(*mp, i);
2957 	    if (*mp == NULL) {
2958 		printf("%s: m_pullup failed\n", __func__);
2959 		return (-1);
2960 	    }
2961 	}
2962 
2963 	eh1 = mtod(*mp, struct ether_header *);
2964 	ether_type = ntohs(eh1->ether_type);
2965 
2966 	/*
2967 	 * Check for SNAP/LLC.
2968 	 */
2969 	if (ether_type < ETHERMTU) {
2970 		struct llc *llc2 = (struct llc *)(eh1 + 1);
2971 
2972 		if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
2973 		    llc2->llc_dsap == LLC_SNAP_LSAP &&
2974 		    llc2->llc_ssap == LLC_SNAP_LSAP &&
2975 		    llc2->llc_control == LLC_UI) {
2976 			ether_type = htons(llc2->llc_un.type_snap.ether_type);
2977 			snap = 1;
2978 		}
2979 	}
2980 
2981 	/*
2982 	 * If we're trying to filter bridge traffic, don't look at anything
2983 	 * other than IP and ARP traffic.  If the filter doesn't understand
2984 	 * IPv6, don't allow IPv6 through the bridge either.  This is lame
2985 	 * since if we really wanted, say, an AppleTalk filter, we are hosed,
2986 	 * but of course we don't have an AppleTalk filter to begin with.
2987 	 * (Note that since pfil doesn't understand ARP it will pass *ALL*
2988 	 * ARP traffic.)
2989 	 */
2990 	switch (ether_type) {
2991 		case ETHERTYPE_ARP:
2992 		case ETHERTYPE_REVARP:
2993 			if (pfil_ipfw_arp == 0)
2994 				return (0); /* Automatically pass */
2995 			break;
2996 
2997 		case ETHERTYPE_IP:
2998 #ifdef INET6
2999 		case ETHERTYPE_IPV6:
3000 #endif /* INET6 */
3001 			break;
3002 		default:
3003 			/*
3004 			 * Check to see if the user wants to pass non-ip
3005 			 * packets, these will not be checked by pfil(9) and
3006 			 * passed unconditionally so the default is to drop.
3007 			 */
3008 			if (pfil_onlyip)
3009 				goto bad;
3010 	}
3011 
3012 	/* Strip off the Ethernet header and keep a copy. */
3013 	m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3014 	m_adj(*mp, ETHER_HDR_LEN);
3015 
3016 	/* Strip off snap header, if present */
3017 	if (snap) {
3018 		m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3019 		m_adj(*mp, sizeof(struct llc));
3020 	}
3021 
3022 	/*
3023 	 * Check the IP header for alignment and errors
3024 	 */
3025 	if (dir == PFIL_IN) {
3026 		switch (ether_type) {
3027 			case ETHERTYPE_IP:
3028 				error = bridge_ip_checkbasic(mp);
3029 				break;
3030 #ifdef INET6
3031 			case ETHERTYPE_IPV6:
3032 				error = bridge_ip6_checkbasic(mp);
3033 				break;
3034 #endif /* INET6 */
3035 			default:
3036 				error = 0;
3037 		}
3038 		if (error)
3039 			goto bad;
3040 	}
3041 
3042 	if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) {
3043 		INIT_VNET_INET(curvnet);
3044 
3045 		error = -1;
3046 		args.rule = ip_dn_claim_rule(*mp);
3047 		if (args.rule != NULL && V_fw_one_pass)
3048 			goto ipfwpass; /* packet already partially processed */
3049 
3050 		args.m = *mp;
3051 		args.oif = ifp;
3052 		args.next_hop = NULL;
3053 		args.eh = &eh2;
3054 		args.inp = NULL;	/* used by ipfw uid/gid/jail rules */
3055 		i = ip_fw_chk_ptr(&args);
3056 		*mp = args.m;
3057 
3058 		if (*mp == NULL)
3059 			return (error);
3060 
3061 		if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
3062 
3063 			/* put the Ethernet header back on */
3064 			M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3065 			if (*mp == NULL)
3066 				return (error);
3067 			bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3068 
3069 			/*
3070 			 * Pass the pkt to dummynet, which consumes it. The
3071 			 * packet will return to us via bridge_dummynet().
3072 			 */
3073 			args.oif = ifp;
3074 			ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args);
3075 			return (error);
3076 		}
3077 
3078 		if (i != IP_FW_PASS) /* drop */
3079 			goto bad;
3080 	}
3081 
3082 ipfwpass:
3083 	error = 0;
3084 
3085 	/*
3086 	 * Run the packet through pfil
3087 	 */
3088 	switch (ether_type) {
3089 	case ETHERTYPE_IP:
3090 		/*
3091 		 * before calling the firewall, swap fields the same as
3092 		 * IP does. here we assume the header is contiguous
3093 		 */
3094 		ip = mtod(*mp, struct ip *);
3095 
3096 		ip->ip_len = ntohs(ip->ip_len);
3097 		ip->ip_off = ntohs(ip->ip_off);
3098 
3099 		/*
3100 		 * Run pfil on the member interface and the bridge, both can
3101 		 * be skipped by clearing pfil_member or pfil_bridge.
3102 		 *
3103 		 * Keep the order:
3104 		 *   in_if -> bridge_if -> out_if
3105 		 */
3106 		if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3107 			error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
3108 					dir, NULL);
3109 
3110 		if (*mp == NULL || error != 0) /* filter may consume */
3111 			break;
3112 
3113 		if (pfil_member && ifp != NULL)
3114 			error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
3115 					dir, NULL);
3116 
3117 		if (*mp == NULL || error != 0) /* filter may consume */
3118 			break;
3119 
3120 		if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3121 			error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
3122 					dir, NULL);
3123 
3124 		if (*mp == NULL || error != 0) /* filter may consume */
3125 			break;
3126 
3127 		/* check if we need to fragment the packet */
3128 		if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3129 			i = (*mp)->m_pkthdr.len;
3130 			if (i > ifp->if_mtu) {
3131 				error = bridge_fragment(ifp, *mp, &eh2, snap,
3132 					    &llc1);
3133 				return (error);
3134 			}
3135 		}
3136 
3137 		/* Recalculate the ip checksum and restore byte ordering */
3138 		ip = mtod(*mp, struct ip *);
3139 		hlen = ip->ip_hl << 2;
3140 		if (hlen < sizeof(struct ip))
3141 			goto bad;
3142 		if (hlen > (*mp)->m_len) {
3143 			if ((*mp = m_pullup(*mp, hlen)) == 0)
3144 				goto bad;
3145 			ip = mtod(*mp, struct ip *);
3146 			if (ip == NULL)
3147 				goto bad;
3148 		}
3149 		ip->ip_len = htons(ip->ip_len);
3150 		ip->ip_off = htons(ip->ip_off);
3151 		ip->ip_sum = 0;
3152 		if (hlen == sizeof(struct ip))
3153 			ip->ip_sum = in_cksum_hdr(ip);
3154 		else
3155 			ip->ip_sum = in_cksum(*mp, hlen);
3156 
3157 		break;
3158 #ifdef INET6
3159 	case ETHERTYPE_IPV6:
3160 		if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3161 			error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3162 					dir, NULL);
3163 
3164 		if (*mp == NULL || error != 0) /* filter may consume */
3165 			break;
3166 
3167 		if (pfil_member && ifp != NULL)
3168 			error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
3169 					dir, NULL);
3170 
3171 		if (*mp == NULL || error != 0) /* filter may consume */
3172 			break;
3173 
3174 		if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3175 			error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3176 					dir, NULL);
3177 		break;
3178 #endif
3179 	default:
3180 		error = 0;
3181 		break;
3182 	}
3183 
3184 	if (*mp == NULL)
3185 		return (error);
3186 	if (error != 0)
3187 		goto bad;
3188 
3189 	error = -1;
3190 
3191 	/*
3192 	 * Finally, put everything back the way it was and return
3193 	 */
3194 	if (snap) {
3195 		M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
3196 		if (*mp == NULL)
3197 			return (error);
3198 		bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3199 	}
3200 
3201 	M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3202 	if (*mp == NULL)
3203 		return (error);
3204 	bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3205 
3206 	return (0);
3207 
3208 bad:
3209 	m_freem(*mp);
3210 	*mp = NULL;
3211 	return (error);
3212 }
3213 
3214 /*
3215  * Perform basic checks on header size since
3216  * pfil assumes ip_input has already processed
3217  * it for it.  Cut-and-pasted from ip_input.c.
3218  * Given how simple the IPv6 version is,
3219  * does the IPv4 version really need to be
3220  * this complicated?
3221  *
3222  * XXX Should we update ipstat here, or not?
3223  * XXX Right now we update ipstat but not
3224  * XXX csum_counter.
3225  */
3226 static int
3227 bridge_ip_checkbasic(struct mbuf **mp)
3228 {
3229 	INIT_VNET_INET(curvnet);
3230 	struct mbuf *m = *mp;
3231 	struct ip *ip;
3232 	int len, hlen;
3233 	u_short sum;
3234 
3235 	if (*mp == NULL)
3236 		return (-1);
3237 
3238 	if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3239 		if ((m = m_copyup(m, sizeof(struct ip),
3240 			(max_linkhdr + 3) & ~3)) == NULL) {
3241 			/* XXXJRT new stat, please */
3242 			IPSTAT_INC(ips_toosmall);
3243 			goto bad;
3244 		}
3245 	} else if (__predict_false(m->m_len < sizeof (struct ip))) {
3246 		if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3247 			IPSTAT_INC(ips_toosmall);
3248 			goto bad;
3249 		}
3250 	}
3251 	ip = mtod(m, struct ip *);
3252 	if (ip == NULL) goto bad;
3253 
3254 	if (ip->ip_v != IPVERSION) {
3255 		IPSTAT_INC(ips_badvers);
3256 		goto bad;
3257 	}
3258 	hlen = ip->ip_hl << 2;
3259 	if (hlen < sizeof(struct ip)) { /* minimum header length */
3260 		IPSTAT_INC(ips_badhlen);
3261 		goto bad;
3262 	}
3263 	if (hlen > m->m_len) {
3264 		if ((m = m_pullup(m, hlen)) == 0) {
3265 			IPSTAT_INC(ips_badhlen);
3266 			goto bad;
3267 		}
3268 		ip = mtod(m, struct ip *);
3269 		if (ip == NULL) goto bad;
3270 	}
3271 
3272 	if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3273 		sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3274 	} else {
3275 		if (hlen == sizeof(struct ip)) {
3276 			sum = in_cksum_hdr(ip);
3277 		} else {
3278 			sum = in_cksum(m, hlen);
3279 		}
3280 	}
3281 	if (sum) {
3282 		IPSTAT_INC(ips_badsum);
3283 		goto bad;
3284 	}
3285 
3286 	/* Retrieve the packet length. */
3287 	len = ntohs(ip->ip_len);
3288 
3289 	/*
3290 	 * Check for additional length bogosity
3291 	 */
3292 	if (len < hlen) {
3293 		IPSTAT_INC(ips_badlen);
3294 		goto bad;
3295 	}
3296 
3297 	/*
3298 	 * Check that the amount of data in the buffers
3299 	 * is as at least much as the IP header would have us expect.
3300 	 * Drop packet if shorter than we expect.
3301 	 */
3302 	if (m->m_pkthdr.len < len) {
3303 		IPSTAT_INC(ips_tooshort);
3304 		goto bad;
3305 	}
3306 
3307 	/* Checks out, proceed */
3308 	*mp = m;
3309 	return (0);
3310 
3311 bad:
3312 	*mp = m;
3313 	return (-1);
3314 }
3315 
3316 #ifdef INET6
3317 /*
3318  * Same as above, but for IPv6.
3319  * Cut-and-pasted from ip6_input.c.
3320  * XXX Should we update ip6stat, or not?
3321  */
3322 static int
3323 bridge_ip6_checkbasic(struct mbuf **mp)
3324 {
3325 	INIT_VNET_INET6(curvnet);
3326 	struct mbuf *m = *mp;
3327 	struct ip6_hdr *ip6;
3328 
3329 	/*
3330 	 * If the IPv6 header is not aligned, slurp it up into a new
3331 	 * mbuf with space for link headers, in the event we forward
3332 	 * it.  Otherwise, if it is aligned, make sure the entire base
3333 	 * IPv6 header is in the first mbuf of the chain.
3334 	 */
3335 	if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3336 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3337 		if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3338 			    (max_linkhdr + 3) & ~3)) == NULL) {
3339 			/* XXXJRT new stat, please */
3340 			V_ip6stat.ip6s_toosmall++;
3341 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3342 			goto bad;
3343 		}
3344 	} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3345 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3346 		if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3347 			V_ip6stat.ip6s_toosmall++;
3348 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3349 			goto bad;
3350 		}
3351 	}
3352 
3353 	ip6 = mtod(m, struct ip6_hdr *);
3354 
3355 	if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3356 		V_ip6stat.ip6s_badvers++;
3357 		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3358 		goto bad;
3359 	}
3360 
3361 	/* Checks out, proceed */
3362 	*mp = m;
3363 	return (0);
3364 
3365 bad:
3366 	*mp = m;
3367 	return (-1);
3368 }
3369 #endif /* INET6 */
3370 
3371 /*
3372  * bridge_fragment:
3373  *
3374  *	Return a fragmented mbuf chain.
3375  */
3376 static int
3377 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3378     int snap, struct llc *llc)
3379 {
3380 	INIT_VNET_INET(curvnet);
3381 	struct mbuf *m0;
3382 	struct ip *ip;
3383 	int error = -1;
3384 
3385 	if (m->m_len < sizeof(struct ip) &&
3386 	    (m = m_pullup(m, sizeof(struct ip))) == NULL)
3387 		goto out;
3388 	ip = mtod(m, struct ip *);
3389 
3390 	error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
3391 		    CSUM_DELAY_IP);
3392 	if (error)
3393 		goto out;
3394 
3395 	/* walk the chain and re-add the Ethernet header */
3396 	for (m0 = m; m0; m0 = m0->m_nextpkt) {
3397 		if (error == 0) {
3398 			if (snap) {
3399 				M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
3400 				if (m0 == NULL) {
3401 					error = ENOBUFS;
3402 					continue;
3403 				}
3404 				bcopy(llc, mtod(m0, caddr_t),
3405 				    sizeof(struct llc));
3406 			}
3407 			M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
3408 			if (m0 == NULL) {
3409 				error = ENOBUFS;
3410 				continue;
3411 			}
3412 			bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3413 		} else
3414 			m_freem(m);
3415 	}
3416 
3417 	if (error == 0)
3418 		IPSTAT_INC(ips_fragmented);
3419 
3420 	return (error);
3421 
3422 out:
3423 	if (m != NULL)
3424 		m_freem(m);
3425 	return (error);
3426 }
3427