xref: /freebsd/sys/net/if_bridge.c (revision e40139ff33b48b56a24c808b166b04b8ee6f5b21)
1 /*	$NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-4-Clause
5  *
6  * Copyright 2001 Wasabi Systems, Inc.
7  * All rights reserved.
8  *
9  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  *    must display the following acknowledgement:
21  *	This product includes software developed for the NetBSD Project by
22  *	Wasabi Systems, Inc.
23  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
24  *    or promote products derived from this software without specific prior
25  *    written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGE.
38  */
39 
40 /*
41  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
42  * All rights reserved.
43  *
44  * Redistribution and use in source and binary forms, with or without
45  * modification, are permitted provided that the following conditions
46  * are met:
47  * 1. Redistributions of source code must retain the above copyright
48  *    notice, this list of conditions and the following disclaimer.
49  * 2. Redistributions in binary form must reproduce the above copyright
50  *    notice, this list of conditions and the following disclaimer in the
51  *    documentation and/or other materials provided with the distribution.
52  *
53  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
54  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
55  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
56  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
57  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
58  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
59  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
61  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
62  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
63  * POSSIBILITY OF SUCH DAMAGE.
64  *
65  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
66  */
67 
68 /*
69  * Network interface bridge support.
70  *
71  * TODO:
72  *
73  *	- Currently only supports Ethernet-like interfaces (Ethernet,
74  *	  802.11, VLANs on Ethernet, etc.)  Figure out a nice way
75  *	  to bridge other types of interfaces (maybe consider
76  *	  heterogeneous bridges).
77  */
78 
79 #include <sys/cdefs.h>
80 __FBSDID("$FreeBSD$");
81 
82 #include "opt_inet.h"
83 #include "opt_inet6.h"
84 
85 #include <sys/param.h>
86 #include <sys/eventhandler.h>
87 #include <sys/mbuf.h>
88 #include <sys/malloc.h>
89 #include <sys/protosw.h>
90 #include <sys/systm.h>
91 #include <sys/jail.h>
92 #include <sys/time.h>
93 #include <sys/socket.h> /* for net/if.h */
94 #include <sys/sockio.h>
95 #include <sys/ctype.h>  /* string functions */
96 #include <sys/kernel.h>
97 #include <sys/random.h>
98 #include <sys/syslog.h>
99 #include <sys/sysctl.h>
100 #include <vm/uma.h>
101 #include <sys/module.h>
102 #include <sys/priv.h>
103 #include <sys/proc.h>
104 #include <sys/lock.h>
105 #include <sys/mutex.h>
106 
107 #include <net/bpf.h>
108 #include <net/if.h>
109 #include <net/if_clone.h>
110 #include <net/if_dl.h>
111 #include <net/if_types.h>
112 #include <net/if_var.h>
113 #include <net/pfil.h>
114 #include <net/vnet.h>
115 
116 #include <netinet/in.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
121 #ifdef INET6
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
124 #include <netinet6/in6_ifattach.h>
125 #endif
126 #if defined(INET) || defined(INET6)
127 #include <netinet/ip_carp.h>
128 #endif
129 #include <machine/in_cksum.h>
130 #include <netinet/if_ether.h>
131 #include <net/bridgestp.h>
132 #include <net/if_bridgevar.h>
133 #include <net/if_llc.h>
134 #include <net/if_vlan_var.h>
135 
136 #include <net/route.h>
137 
138 /*
139  * Size of the route hash table.  Must be a power of two.
140  */
141 #ifndef BRIDGE_RTHASH_SIZE
142 #define	BRIDGE_RTHASH_SIZE		1024
143 #endif
144 
145 #define	BRIDGE_RTHASH_MASK		(BRIDGE_RTHASH_SIZE - 1)
146 
147 /*
148  * Default maximum number of addresses to cache.
149  */
150 #ifndef BRIDGE_RTABLE_MAX
151 #define	BRIDGE_RTABLE_MAX		2000
152 #endif
153 
154 /*
155  * Timeout (in seconds) for entries learned dynamically.
156  */
157 #ifndef BRIDGE_RTABLE_TIMEOUT
158 #define	BRIDGE_RTABLE_TIMEOUT		(20 * 60)	/* same as ARP */
159 #endif
160 
161 /*
162  * Number of seconds between walks of the route list.
163  */
164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
165 #define	BRIDGE_RTABLE_PRUNE_PERIOD	(5 * 60)
166 #endif
167 
168 /*
169  * List of capabilities to possibly mask on the member interface.
170  */
171 #define	BRIDGE_IFCAPS_MASK		(IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
172 					 IFCAP_TXCSUM_IPV6)
173 
174 /*
175  * List of capabilities to strip
176  */
177 #define	BRIDGE_IFCAPS_STRIP		IFCAP_LRO
178 
179 /*
180  * Bridge interface list entry.
181  */
182 struct bridge_iflist {
183 	LIST_ENTRY(bridge_iflist) bif_next;
184 	struct ifnet		*bif_ifp;	/* member if */
185 	struct bstp_port	bif_stp;	/* STP state */
186 	uint32_t		bif_flags;	/* member if flags */
187 	int			bif_savedcaps;	/* saved capabilities */
188 	uint32_t		bif_addrmax;	/* max # of addresses */
189 	uint32_t		bif_addrcnt;	/* cur. # of addresses */
190 	uint32_t		bif_addrexceeded;/* # of address violations */
191 };
192 
193 /*
194  * Bridge route node.
195  */
196 struct bridge_rtnode {
197 	LIST_ENTRY(bridge_rtnode) brt_hash;	/* hash table linkage */
198 	LIST_ENTRY(bridge_rtnode) brt_list;	/* list linkage */
199 	struct bridge_iflist	*brt_dst;	/* destination if */
200 	unsigned long		brt_expire;	/* expiration time */
201 	uint8_t			brt_flags;	/* address flags */
202 	uint8_t			brt_addr[ETHER_ADDR_LEN];
203 	uint16_t		brt_vlan;	/* vlan id */
204 };
205 #define	brt_ifp			brt_dst->bif_ifp
206 
207 /*
208  * Software state for each bridge.
209  */
210 struct bridge_softc {
211 	struct ifnet		*sc_ifp;	/* make this an interface */
212 	LIST_ENTRY(bridge_softc) sc_list;
213 	struct mtx		sc_mtx;
214 	struct cv		sc_cv;
215 	uint32_t		sc_brtmax;	/* max # of addresses */
216 	uint32_t		sc_brtcnt;	/* cur. # of addresses */
217 	uint32_t		sc_brttimeout;	/* rt timeout in seconds */
218 	struct callout		sc_brcallout;	/* bridge callout */
219 	uint32_t		sc_iflist_ref;	/* refcount for sc_iflist */
220 	uint32_t		sc_iflist_xcnt;	/* refcount for sc_iflist */
221 	LIST_HEAD(, bridge_iflist) sc_iflist;	/* member interface list */
222 	LIST_HEAD(, bridge_rtnode) *sc_rthash;	/* our forwarding table */
223 	LIST_HEAD(, bridge_rtnode) sc_rtlist;	/* list version of above */
224 	uint32_t		sc_rthash_key;	/* key for hash */
225 	LIST_HEAD(, bridge_iflist) sc_spanlist;	/* span ports list */
226 	struct bstp_state	sc_stp;		/* STP state */
227 	uint32_t		sc_brtexceeded;	/* # of cache drops */
228 	struct ifnet		*sc_ifaddr;	/* member mac copied from */
229 	struct ether_addr	sc_defaddr;	/* Default MAC address */
230 };
231 
232 VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
233 #define	V_bridge_list_mtx	VNET(bridge_list_mtx)
234 static eventhandler_tag bridge_detach_cookie;
235 
236 int	bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
237 
238 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
239 #define	V_bridge_rtnode_zone	VNET(bridge_rtnode_zone)
240 
241 static int	bridge_clone_create(struct if_clone *, int, caddr_t);
242 static void	bridge_clone_destroy(struct ifnet *);
243 
244 static int	bridge_ioctl(struct ifnet *, u_long, caddr_t);
245 static void	bridge_mutecaps(struct bridge_softc *);
246 static void	bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
247 		    int);
248 static void	bridge_ifdetach(void *arg __unused, struct ifnet *);
249 static void	bridge_init(void *);
250 static void	bridge_dummynet(struct mbuf *, struct ifnet *);
251 static void	bridge_stop(struct ifnet *, int);
252 static int	bridge_transmit(struct ifnet *, struct mbuf *);
253 static void	bridge_qflush(struct ifnet *);
254 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
255 static int	bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
256 		    struct rtentry *);
257 static int	bridge_enqueue(struct bridge_softc *, struct ifnet *,
258 		    struct mbuf *);
259 static void	bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
260 
261 static void	bridge_forward(struct bridge_softc *, struct bridge_iflist *,
262 		    struct mbuf *m);
263 
264 static void	bridge_timer(void *);
265 
266 static void	bridge_broadcast(struct bridge_softc *, struct ifnet *,
267 		    struct mbuf *, int);
268 static void	bridge_span(struct bridge_softc *, struct mbuf *);
269 
270 static int	bridge_rtupdate(struct bridge_softc *, const uint8_t *,
271 		    uint16_t, struct bridge_iflist *, int, uint8_t);
272 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
273 		    uint16_t);
274 static void	bridge_rttrim(struct bridge_softc *);
275 static void	bridge_rtage(struct bridge_softc *);
276 static void	bridge_rtflush(struct bridge_softc *, int);
277 static int	bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
278 		    uint16_t);
279 
280 static void	bridge_rtable_init(struct bridge_softc *);
281 static void	bridge_rtable_fini(struct bridge_softc *);
282 
283 static int	bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
284 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
285 		    const uint8_t *, uint16_t);
286 static int	bridge_rtnode_insert(struct bridge_softc *,
287 		    struct bridge_rtnode *);
288 static void	bridge_rtnode_destroy(struct bridge_softc *,
289 		    struct bridge_rtnode *);
290 static void	bridge_rtable_expire(struct ifnet *, int);
291 static void	bridge_state_change(struct ifnet *, int);
292 
293 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
294 		    const char *name);
295 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
296 		    struct ifnet *ifp);
297 static void	bridge_delete_member(struct bridge_softc *,
298 		    struct bridge_iflist *, int);
299 static void	bridge_delete_span(struct bridge_softc *,
300 		    struct bridge_iflist *);
301 
302 static int	bridge_ioctl_add(struct bridge_softc *, void *);
303 static int	bridge_ioctl_del(struct bridge_softc *, void *);
304 static int	bridge_ioctl_gifflags(struct bridge_softc *, void *);
305 static int	bridge_ioctl_sifflags(struct bridge_softc *, void *);
306 static int	bridge_ioctl_scache(struct bridge_softc *, void *);
307 static int	bridge_ioctl_gcache(struct bridge_softc *, void *);
308 static int	bridge_ioctl_gifs(struct bridge_softc *, void *);
309 static int	bridge_ioctl_rts(struct bridge_softc *, void *);
310 static int	bridge_ioctl_saddr(struct bridge_softc *, void *);
311 static int	bridge_ioctl_sto(struct bridge_softc *, void *);
312 static int	bridge_ioctl_gto(struct bridge_softc *, void *);
313 static int	bridge_ioctl_daddr(struct bridge_softc *, void *);
314 static int	bridge_ioctl_flush(struct bridge_softc *, void *);
315 static int	bridge_ioctl_gpri(struct bridge_softc *, void *);
316 static int	bridge_ioctl_spri(struct bridge_softc *, void *);
317 static int	bridge_ioctl_ght(struct bridge_softc *, void *);
318 static int	bridge_ioctl_sht(struct bridge_softc *, void *);
319 static int	bridge_ioctl_gfd(struct bridge_softc *, void *);
320 static int	bridge_ioctl_sfd(struct bridge_softc *, void *);
321 static int	bridge_ioctl_gma(struct bridge_softc *, void *);
322 static int	bridge_ioctl_sma(struct bridge_softc *, void *);
323 static int	bridge_ioctl_sifprio(struct bridge_softc *, void *);
324 static int	bridge_ioctl_sifcost(struct bridge_softc *, void *);
325 static int	bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
326 static int	bridge_ioctl_addspan(struct bridge_softc *, void *);
327 static int	bridge_ioctl_delspan(struct bridge_softc *, void *);
328 static int	bridge_ioctl_gbparam(struct bridge_softc *, void *);
329 static int	bridge_ioctl_grte(struct bridge_softc *, void *);
330 static int	bridge_ioctl_gifsstp(struct bridge_softc *, void *);
331 static int	bridge_ioctl_sproto(struct bridge_softc *, void *);
332 static int	bridge_ioctl_stxhc(struct bridge_softc *, void *);
333 static int	bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
334 		    int);
335 static int	bridge_ip_checkbasic(struct mbuf **mp);
336 #ifdef INET6
337 static int	bridge_ip6_checkbasic(struct mbuf **mp);
338 #endif /* INET6 */
339 static int	bridge_fragment(struct ifnet *, struct mbuf **mp,
340 		    struct ether_header *, int, struct llc *);
341 static void	bridge_linkstate(struct ifnet *ifp);
342 static void	bridge_linkcheck(struct bridge_softc *sc);
343 
344 
345 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
346 #define	VLANTAGOF(_m)	\
347     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
348 
349 static struct bstp_cb_ops bridge_ops = {
350 	.bcb_state = bridge_state_change,
351 	.bcb_rtage = bridge_rtable_expire
352 };
353 
354 SYSCTL_DECL(_net_link);
355 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
356 
357 /* only pass IP[46] packets when pfil is enabled */
358 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
359 #define	V_pfil_onlyip	VNET(pfil_onlyip)
360 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
361     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
362     "Only pass IP packets when pfil is enabled");
363 
364 /* run pfil hooks on the bridge interface */
365 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
366 #define	V_pfil_bridge	VNET(pfil_bridge)
367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
368     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
369     "Packet filter on the bridge interface");
370 
371 /* layer2 filter with ipfw */
372 VNET_DEFINE_STATIC(int, pfil_ipfw);
373 #define	V_pfil_ipfw	VNET(pfil_ipfw)
374 
375 /* layer2 ARP filter with ipfw */
376 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
377 #define	V_pfil_ipfw_arp	VNET(pfil_ipfw_arp)
378 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
379     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
380     "Filter ARP packets through IPFW layer2");
381 
382 /* run pfil hooks on the member interface */
383 VNET_DEFINE_STATIC(int, pfil_member) = 1;
384 #define	V_pfil_member	VNET(pfil_member)
385 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
386     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
387     "Packet filter on the member interface");
388 
389 /* run pfil hooks on the physical interface for locally destined packets */
390 VNET_DEFINE_STATIC(int, pfil_local_phys);
391 #define	V_pfil_local_phys	VNET(pfil_local_phys)
392 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
393     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
394     "Packet filter on the physical interface for locally destined packets");
395 
396 /* log STP state changes */
397 VNET_DEFINE_STATIC(int, log_stp);
398 #define	V_log_stp	VNET(log_stp)
399 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
400     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
401     "Log STP state changes");
402 
403 /* share MAC with first bridge member */
404 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
405 #define	V_bridge_inherit_mac	VNET(bridge_inherit_mac)
406 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
407     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
408     "Inherit MAC address from the first bridge member");
409 
410 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
411 #define	V_allow_llz_overlap	VNET(allow_llz_overlap)
412 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
413     CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
414     "Allow overlap of link-local scope "
415     "zones of a bridge interface and the member interfaces");
416 
417 struct bridge_control {
418 	int	(*bc_func)(struct bridge_softc *, void *);
419 	int	bc_argsize;
420 	int	bc_flags;
421 };
422 
423 #define	BC_F_COPYIN		0x01	/* copy arguments in */
424 #define	BC_F_COPYOUT		0x02	/* copy arguments out */
425 #define	BC_F_SUSER		0x04	/* do super-user check */
426 
427 const struct bridge_control bridge_control_table[] = {
428 	{ bridge_ioctl_add,		sizeof(struct ifbreq),
429 	  BC_F_COPYIN|BC_F_SUSER },
430 	{ bridge_ioctl_del,		sizeof(struct ifbreq),
431 	  BC_F_COPYIN|BC_F_SUSER },
432 
433 	{ bridge_ioctl_gifflags,	sizeof(struct ifbreq),
434 	  BC_F_COPYIN|BC_F_COPYOUT },
435 	{ bridge_ioctl_sifflags,	sizeof(struct ifbreq),
436 	  BC_F_COPYIN|BC_F_SUSER },
437 
438 	{ bridge_ioctl_scache,		sizeof(struct ifbrparam),
439 	  BC_F_COPYIN|BC_F_SUSER },
440 	{ bridge_ioctl_gcache,		sizeof(struct ifbrparam),
441 	  BC_F_COPYOUT },
442 
443 	{ bridge_ioctl_gifs,		sizeof(struct ifbifconf),
444 	  BC_F_COPYIN|BC_F_COPYOUT },
445 	{ bridge_ioctl_rts,		sizeof(struct ifbaconf),
446 	  BC_F_COPYIN|BC_F_COPYOUT },
447 
448 	{ bridge_ioctl_saddr,		sizeof(struct ifbareq),
449 	  BC_F_COPYIN|BC_F_SUSER },
450 
451 	{ bridge_ioctl_sto,		sizeof(struct ifbrparam),
452 	  BC_F_COPYIN|BC_F_SUSER },
453 	{ bridge_ioctl_gto,		sizeof(struct ifbrparam),
454 	  BC_F_COPYOUT },
455 
456 	{ bridge_ioctl_daddr,		sizeof(struct ifbareq),
457 	  BC_F_COPYIN|BC_F_SUSER },
458 
459 	{ bridge_ioctl_flush,		sizeof(struct ifbreq),
460 	  BC_F_COPYIN|BC_F_SUSER },
461 
462 	{ bridge_ioctl_gpri,		sizeof(struct ifbrparam),
463 	  BC_F_COPYOUT },
464 	{ bridge_ioctl_spri,		sizeof(struct ifbrparam),
465 	  BC_F_COPYIN|BC_F_SUSER },
466 
467 	{ bridge_ioctl_ght,		sizeof(struct ifbrparam),
468 	  BC_F_COPYOUT },
469 	{ bridge_ioctl_sht,		sizeof(struct ifbrparam),
470 	  BC_F_COPYIN|BC_F_SUSER },
471 
472 	{ bridge_ioctl_gfd,		sizeof(struct ifbrparam),
473 	  BC_F_COPYOUT },
474 	{ bridge_ioctl_sfd,		sizeof(struct ifbrparam),
475 	  BC_F_COPYIN|BC_F_SUSER },
476 
477 	{ bridge_ioctl_gma,		sizeof(struct ifbrparam),
478 	  BC_F_COPYOUT },
479 	{ bridge_ioctl_sma,		sizeof(struct ifbrparam),
480 	  BC_F_COPYIN|BC_F_SUSER },
481 
482 	{ bridge_ioctl_sifprio,		sizeof(struct ifbreq),
483 	  BC_F_COPYIN|BC_F_SUSER },
484 
485 	{ bridge_ioctl_sifcost,		sizeof(struct ifbreq),
486 	  BC_F_COPYIN|BC_F_SUSER },
487 
488 	{ bridge_ioctl_addspan,		sizeof(struct ifbreq),
489 	  BC_F_COPYIN|BC_F_SUSER },
490 	{ bridge_ioctl_delspan,		sizeof(struct ifbreq),
491 	  BC_F_COPYIN|BC_F_SUSER },
492 
493 	{ bridge_ioctl_gbparam,		sizeof(struct ifbropreq),
494 	  BC_F_COPYOUT },
495 
496 	{ bridge_ioctl_grte,		sizeof(struct ifbrparam),
497 	  BC_F_COPYOUT },
498 
499 	{ bridge_ioctl_gifsstp,		sizeof(struct ifbpstpconf),
500 	  BC_F_COPYIN|BC_F_COPYOUT },
501 
502 	{ bridge_ioctl_sproto,		sizeof(struct ifbrparam),
503 	  BC_F_COPYIN|BC_F_SUSER },
504 
505 	{ bridge_ioctl_stxhc,		sizeof(struct ifbrparam),
506 	  BC_F_COPYIN|BC_F_SUSER },
507 
508 	{ bridge_ioctl_sifmaxaddr,	sizeof(struct ifbreq),
509 	  BC_F_COPYIN|BC_F_SUSER },
510 
511 };
512 const int bridge_control_table_size = nitems(bridge_control_table);
513 
514 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
515 #define	V_bridge_list	VNET(bridge_list)
516 #define	BRIDGE_LIST_LOCK_INIT(x)	mtx_init(&V_bridge_list_mtx,	\
517 					    "if_bridge list", NULL, MTX_DEF)
518 #define	BRIDGE_LIST_LOCK_DESTROY(x)	mtx_destroy(&V_bridge_list_mtx)
519 #define	BRIDGE_LIST_LOCK(x)		mtx_lock(&V_bridge_list_mtx)
520 #define	BRIDGE_LIST_UNLOCK(x)		mtx_unlock(&V_bridge_list_mtx)
521 
522 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
523 #define	V_bridge_cloner	VNET(bridge_cloner)
524 
525 static const char bridge_name[] = "bridge";
526 
527 static void
528 vnet_bridge_init(const void *unused __unused)
529 {
530 
531 	V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
532 	    sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
533 	    UMA_ALIGN_PTR, 0);
534 	BRIDGE_LIST_LOCK_INIT();
535 	LIST_INIT(&V_bridge_list);
536 	V_bridge_cloner = if_clone_simple(bridge_name,
537 	    bridge_clone_create, bridge_clone_destroy, 0);
538 }
539 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
540     vnet_bridge_init, NULL);
541 
542 static void
543 vnet_bridge_uninit(const void *unused __unused)
544 {
545 
546 	if_clone_detach(V_bridge_cloner);
547 	V_bridge_cloner = NULL;
548 	BRIDGE_LIST_LOCK_DESTROY();
549 	uma_zdestroy(V_bridge_rtnode_zone);
550 }
551 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
552     vnet_bridge_uninit, NULL);
553 
554 static int
555 bridge_modevent(module_t mod, int type, void *data)
556 {
557 
558 	switch (type) {
559 	case MOD_LOAD:
560 		bridge_dn_p = bridge_dummynet;
561 		bridge_detach_cookie = EVENTHANDLER_REGISTER(
562 		    ifnet_departure_event, bridge_ifdetach, NULL,
563 		    EVENTHANDLER_PRI_ANY);
564 		break;
565 	case MOD_UNLOAD:
566 		EVENTHANDLER_DEREGISTER(ifnet_departure_event,
567 		    bridge_detach_cookie);
568 		bridge_dn_p = NULL;
569 		break;
570 	default:
571 		return (EOPNOTSUPP);
572 	}
573 	return (0);
574 }
575 
576 static moduledata_t bridge_mod = {
577 	"if_bridge",
578 	bridge_modevent,
579 	0
580 };
581 
582 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
583 MODULE_VERSION(if_bridge, 1);
584 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
585 
586 /*
587  * handler for net.link.bridge.ipfw
588  */
589 static int
590 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
591 {
592 	int enable = V_pfil_ipfw;
593 	int error;
594 
595 	error = sysctl_handle_int(oidp, &enable, 0, req);
596 	enable &= 1;
597 
598 	if (enable != V_pfil_ipfw) {
599 		V_pfil_ipfw = enable;
600 
601 		/*
602 		 * Disable pfil so that ipfw doesnt run twice, if the user
603 		 * really wants both then they can re-enable pfil_bridge and/or
604 		 * pfil_member. Also allow non-ip packets as ipfw can filter by
605 		 * layer2 type.
606 		 */
607 		if (V_pfil_ipfw) {
608 			V_pfil_onlyip = 0;
609 			V_pfil_bridge = 0;
610 			V_pfil_member = 0;
611 		}
612 	}
613 
614 	return (error);
615 }
616 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
617     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
618     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
619     "Layer2 filter with IPFW");
620 
621 /*
622  * bridge_clone_create:
623  *
624  *	Create a new bridge instance.
625  */
626 static int
627 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
628 {
629 	struct bridge_softc *sc, *sc2;
630 	struct ifnet *bifp, *ifp;
631 	int fb, retry;
632 	unsigned long hostid;
633 
634 	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
635 	ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
636 	if (ifp == NULL) {
637 		free(sc, M_DEVBUF);
638 		return (ENOSPC);
639 	}
640 
641 	BRIDGE_LOCK_INIT(sc);
642 	sc->sc_brtmax = BRIDGE_RTABLE_MAX;
643 	sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
644 
645 	/* Initialize our routing table. */
646 	bridge_rtable_init(sc);
647 
648 	callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
649 
650 	LIST_INIT(&sc->sc_iflist);
651 	LIST_INIT(&sc->sc_spanlist);
652 
653 	ifp->if_softc = sc;
654 	if_initname(ifp, bridge_name, unit);
655 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
656 	ifp->if_ioctl = bridge_ioctl;
657 	ifp->if_transmit = bridge_transmit;
658 	ifp->if_qflush = bridge_qflush;
659 	ifp->if_init = bridge_init;
660 	ifp->if_type = IFT_BRIDGE;
661 
662 	/*
663 	 * Generate an ethernet address with a locally administered address.
664 	 *
665 	 * Since we are using random ethernet addresses for the bridge, it is
666 	 * possible that we might have address collisions, so make sure that
667 	 * this hardware address isn't already in use on another bridge.
668 	 * The first try uses the hostid and falls back to arc4rand().
669 	 */
670 	fb = 0;
671 	getcredhostid(curthread->td_ucred, &hostid);
672 	do {
673 		if (fb || hostid == 0) {
674 			ether_gen_addr(ifp, &sc->sc_defaddr);
675 		} else {
676 			sc->sc_defaddr.octet[0] = 0x2;
677 			sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff;
678 			sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff;
679 			sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff;
680 			sc->sc_defaddr.octet[4] =  hostid        & 0xff;
681 			sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff;
682 		}
683 
684 		fb = 1;
685 		retry = 0;
686 		BRIDGE_LIST_LOCK();
687 		LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
688 			bifp = sc2->sc_ifp;
689 			if (memcmp(sc->sc_defaddr.octet,
690 			    IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
691 				retry = 1;
692 				break;
693 			}
694 		}
695 		BRIDGE_LIST_UNLOCK();
696 	} while (retry == 1);
697 
698 	bstp_attach(&sc->sc_stp, &bridge_ops);
699 	ether_ifattach(ifp, sc->sc_defaddr.octet);
700 	/* Now undo some of the damage... */
701 	ifp->if_baudrate = 0;
702 	ifp->if_type = IFT_BRIDGE;
703 
704 	BRIDGE_LIST_LOCK();
705 	LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
706 	BRIDGE_LIST_UNLOCK();
707 
708 	return (0);
709 }
710 
711 /*
712  * bridge_clone_destroy:
713  *
714  *	Destroy a bridge instance.
715  */
716 static void
717 bridge_clone_destroy(struct ifnet *ifp)
718 {
719 	struct bridge_softc *sc = ifp->if_softc;
720 	struct bridge_iflist *bif;
721 
722 	BRIDGE_LOCK(sc);
723 
724 	bridge_stop(ifp, 1);
725 	ifp->if_flags &= ~IFF_UP;
726 
727 	while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
728 		bridge_delete_member(sc, bif, 0);
729 
730 	while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
731 		bridge_delete_span(sc, bif);
732 	}
733 
734 	/* Tear down the routing table. */
735 	bridge_rtable_fini(sc);
736 
737 	BRIDGE_UNLOCK(sc);
738 
739 	callout_drain(&sc->sc_brcallout);
740 
741 	BRIDGE_LIST_LOCK();
742 	LIST_REMOVE(sc, sc_list);
743 	BRIDGE_LIST_UNLOCK();
744 
745 	bstp_detach(&sc->sc_stp);
746 	ether_ifdetach(ifp);
747 	if_free(ifp);
748 
749 	BRIDGE_LOCK_DESTROY(sc);
750 	free(sc, M_DEVBUF);
751 }
752 
753 /*
754  * bridge_ioctl:
755  *
756  *	Handle a control request from the operator.
757  */
758 static int
759 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
760 {
761 	struct bridge_softc *sc = ifp->if_softc;
762 	struct ifreq *ifr = (struct ifreq *)data;
763 	struct bridge_iflist *bif;
764 	struct thread *td = curthread;
765 	union {
766 		struct ifbreq ifbreq;
767 		struct ifbifconf ifbifconf;
768 		struct ifbareq ifbareq;
769 		struct ifbaconf ifbaconf;
770 		struct ifbrparam ifbrparam;
771 		struct ifbropreq ifbropreq;
772 	} args;
773 	struct ifdrv *ifd = (struct ifdrv *) data;
774 	const struct bridge_control *bc;
775 	int error = 0;
776 
777 	switch (cmd) {
778 
779 	case SIOCADDMULTI:
780 	case SIOCDELMULTI:
781 		break;
782 
783 	case SIOCGDRVSPEC:
784 	case SIOCSDRVSPEC:
785 		if (ifd->ifd_cmd >= bridge_control_table_size) {
786 			error = EINVAL;
787 			break;
788 		}
789 		bc = &bridge_control_table[ifd->ifd_cmd];
790 
791 		if (cmd == SIOCGDRVSPEC &&
792 		    (bc->bc_flags & BC_F_COPYOUT) == 0) {
793 			error = EINVAL;
794 			break;
795 		}
796 		else if (cmd == SIOCSDRVSPEC &&
797 		    (bc->bc_flags & BC_F_COPYOUT) != 0) {
798 			error = EINVAL;
799 			break;
800 		}
801 
802 		if (bc->bc_flags & BC_F_SUSER) {
803 			error = priv_check(td, PRIV_NET_BRIDGE);
804 			if (error)
805 				break;
806 		}
807 
808 		if (ifd->ifd_len != bc->bc_argsize ||
809 		    ifd->ifd_len > sizeof(args)) {
810 			error = EINVAL;
811 			break;
812 		}
813 
814 		bzero(&args, sizeof(args));
815 		if (bc->bc_flags & BC_F_COPYIN) {
816 			error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
817 			if (error)
818 				break;
819 		}
820 
821 		BRIDGE_LOCK(sc);
822 		error = (*bc->bc_func)(sc, &args);
823 		BRIDGE_UNLOCK(sc);
824 		if (error)
825 			break;
826 
827 		if (bc->bc_flags & BC_F_COPYOUT)
828 			error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
829 
830 		break;
831 
832 	case SIOCSIFFLAGS:
833 		if (!(ifp->if_flags & IFF_UP) &&
834 		    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
835 			/*
836 			 * If interface is marked down and it is running,
837 			 * then stop and disable it.
838 			 */
839 			BRIDGE_LOCK(sc);
840 			bridge_stop(ifp, 1);
841 			BRIDGE_UNLOCK(sc);
842 		} else if ((ifp->if_flags & IFF_UP) &&
843 		    !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
844 			/*
845 			 * If interface is marked up and it is stopped, then
846 			 * start it.
847 			 */
848 			(*ifp->if_init)(sc);
849 		}
850 		break;
851 
852 	case SIOCSIFMTU:
853 		if (ifr->ifr_mtu < 576) {
854 			error = EINVAL;
855 			break;
856 		}
857 		if (LIST_EMPTY(&sc->sc_iflist)) {
858 			sc->sc_ifp->if_mtu = ifr->ifr_mtu;
859 			break;
860 		}
861 		BRIDGE_LOCK(sc);
862 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
863 			if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
864 				log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
865 				    " != %d\n", sc->sc_ifp->if_xname,
866 				    bif->bif_ifp->if_mtu,
867 				    bif->bif_ifp->if_xname, ifr->ifr_mtu);
868 				error = EINVAL;
869 				break;
870 			}
871 		}
872 		if (!error)
873 			sc->sc_ifp->if_mtu = ifr->ifr_mtu;
874 		BRIDGE_UNLOCK(sc);
875 		break;
876 	default:
877 		/*
878 		 * drop the lock as ether_ioctl() will call bridge_start() and
879 		 * cause the lock to be recursed.
880 		 */
881 		error = ether_ioctl(ifp, cmd, data);
882 		break;
883 	}
884 
885 	return (error);
886 }
887 
888 /*
889  * bridge_mutecaps:
890  *
891  *	Clear or restore unwanted capabilities on the member interface
892  */
893 static void
894 bridge_mutecaps(struct bridge_softc *sc)
895 {
896 	struct bridge_iflist *bif;
897 	int enabled, mask;
898 
899 	/* Initial bitmask of capabilities to test */
900 	mask = BRIDGE_IFCAPS_MASK;
901 
902 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
903 		/* Every member must support it or its disabled */
904 		mask &= bif->bif_savedcaps;
905 	}
906 
907 	BRIDGE_XLOCK(sc);
908 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
909 		enabled = bif->bif_ifp->if_capenable;
910 		enabled &= ~BRIDGE_IFCAPS_STRIP;
911 		/* strip off mask bits and enable them again if allowed */
912 		enabled &= ~BRIDGE_IFCAPS_MASK;
913 		enabled |= mask;
914 		BRIDGE_UNLOCK(sc);
915 		bridge_set_ifcap(sc, bif, enabled);
916 		BRIDGE_LOCK(sc);
917 	}
918 	BRIDGE_XDROP(sc);
919 
920 }
921 
922 static void
923 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
924 {
925 	struct ifnet *ifp = bif->bif_ifp;
926 	struct ifreq ifr;
927 	int error, mask, stuck;
928 
929 	BRIDGE_UNLOCK_ASSERT(sc);
930 
931 	bzero(&ifr, sizeof(ifr));
932 	ifr.ifr_reqcap = set;
933 
934 	if (ifp->if_capenable != set) {
935 		error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
936 		if (error)
937 			if_printf(sc->sc_ifp,
938 			    "error setting capabilities on %s: %d\n",
939 			    ifp->if_xname, error);
940 		mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
941 		stuck = ifp->if_capenable & mask & ~set;
942 		if (stuck != 0)
943 			if_printf(sc->sc_ifp,
944 			    "can't disable some capabilities on %s: 0x%x\n",
945 			    ifp->if_xname, stuck);
946 	}
947 }
948 
949 /*
950  * bridge_lookup_member:
951  *
952  *	Lookup a bridge member interface.
953  */
954 static struct bridge_iflist *
955 bridge_lookup_member(struct bridge_softc *sc, const char *name)
956 {
957 	struct bridge_iflist *bif;
958 	struct ifnet *ifp;
959 
960 	BRIDGE_LOCK_ASSERT(sc);
961 
962 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
963 		ifp = bif->bif_ifp;
964 		if (strcmp(ifp->if_xname, name) == 0)
965 			return (bif);
966 	}
967 
968 	return (NULL);
969 }
970 
971 /*
972  * bridge_lookup_member_if:
973  *
974  *	Lookup a bridge member interface by ifnet*.
975  */
976 static struct bridge_iflist *
977 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
978 {
979 	struct bridge_iflist *bif;
980 
981 	BRIDGE_LOCK_ASSERT(sc);
982 
983 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
984 		if (bif->bif_ifp == member_ifp)
985 			return (bif);
986 	}
987 
988 	return (NULL);
989 }
990 
991 /*
992  * bridge_delete_member:
993  *
994  *	Delete the specified member interface.
995  */
996 static void
997 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
998     int gone)
999 {
1000 	struct ifnet *ifs = bif->bif_ifp;
1001 	struct ifnet *fif = NULL;
1002 
1003 	BRIDGE_LOCK_ASSERT(sc);
1004 
1005 	if (bif->bif_flags & IFBIF_STP)
1006 		bstp_disable(&bif->bif_stp);
1007 
1008 	ifs->if_bridge = NULL;
1009 	BRIDGE_XLOCK(sc);
1010 	LIST_REMOVE(bif, bif_next);
1011 	BRIDGE_XDROP(sc);
1012 
1013 	/*
1014 	 * If removing the interface that gave the bridge its mac address, set
1015 	 * the mac address of the bridge to the address of the next member, or
1016 	 * to its default address if no members are left.
1017 	 */
1018 	if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1019 		if (LIST_EMPTY(&sc->sc_iflist)) {
1020 			bcopy(&sc->sc_defaddr,
1021 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1022 			sc->sc_ifaddr = NULL;
1023 		} else {
1024 			fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1025 			bcopy(IF_LLADDR(fif),
1026 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1027 			sc->sc_ifaddr = fif;
1028 		}
1029 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1030 	}
1031 
1032 	bridge_linkcheck(sc);
1033 	bridge_mutecaps(sc);	/* recalcuate now this interface is removed */
1034 	bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1035 	KASSERT(bif->bif_addrcnt == 0,
1036 	    ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1037 
1038 	ifs->if_bridge_output = NULL;
1039 	ifs->if_bridge_input = NULL;
1040 	ifs->if_bridge_linkstate = NULL;
1041 	BRIDGE_UNLOCK(sc);
1042 	if (!gone) {
1043 		switch (ifs->if_type) {
1044 		case IFT_ETHER:
1045 		case IFT_L2VLAN:
1046 			/*
1047 			 * Take the interface out of promiscuous mode, but only
1048 			 * if it was promiscuous in the first place. It might
1049 			 * not be if we're in the bridge_ioctl_add() error path.
1050 			 */
1051 			if (ifs->if_flags & IFF_PROMISC)
1052 				(void) ifpromisc(ifs, 0);
1053 			break;
1054 
1055 		case IFT_GIF:
1056 			break;
1057 
1058 		default:
1059 #ifdef DIAGNOSTIC
1060 			panic("bridge_delete_member: impossible");
1061 #endif
1062 			break;
1063 		}
1064 		/* reneable any interface capabilities */
1065 		bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1066 	}
1067 	bstp_destroy(&bif->bif_stp);	/* prepare to free */
1068 	BRIDGE_LOCK(sc);
1069 	free(bif, M_DEVBUF);
1070 }
1071 
1072 /*
1073  * bridge_delete_span:
1074  *
1075  *	Delete the specified span interface.
1076  */
1077 static void
1078 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1079 {
1080 	BRIDGE_LOCK_ASSERT(sc);
1081 
1082 	KASSERT(bif->bif_ifp->if_bridge == NULL,
1083 	    ("%s: not a span interface", __func__));
1084 
1085 	LIST_REMOVE(bif, bif_next);
1086 	free(bif, M_DEVBUF);
1087 }
1088 
1089 static int
1090 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1091 {
1092 	struct ifbreq *req = arg;
1093 	struct bridge_iflist *bif = NULL;
1094 	struct ifnet *ifs;
1095 	int error = 0;
1096 
1097 	ifs = ifunit(req->ifbr_ifsname);
1098 	if (ifs == NULL)
1099 		return (ENOENT);
1100 	if (ifs->if_ioctl == NULL)	/* must be supported */
1101 		return (EINVAL);
1102 
1103 	/* If it's in the span list, it can't be a member. */
1104 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1105 		if (ifs == bif->bif_ifp)
1106 			return (EBUSY);
1107 
1108 	if (ifs->if_bridge == sc)
1109 		return (EEXIST);
1110 
1111 	if (ifs->if_bridge != NULL)
1112 		return (EBUSY);
1113 
1114 	switch (ifs->if_type) {
1115 	case IFT_ETHER:
1116 	case IFT_L2VLAN:
1117 	case IFT_GIF:
1118 		/* permitted interface types */
1119 		break;
1120 	default:
1121 		return (EINVAL);
1122 	}
1123 
1124 #ifdef INET6
1125 	/*
1126 	 * Two valid inet6 addresses with link-local scope must not be
1127 	 * on the parent interface and the member interfaces at the
1128 	 * same time.  This restriction is needed to prevent violation
1129 	 * of link-local scope zone.  Attempts to add a member
1130 	 * interface which has inet6 addresses when the parent has
1131 	 * inet6 triggers removal of all inet6 addresses on the member
1132 	 * interface.
1133 	 */
1134 
1135 	/* Check if the parent interface has a link-local scope addr. */
1136 	if (V_allow_llz_overlap == 0 &&
1137 	    in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1138 		/*
1139 		 * If any, remove all inet6 addresses from the member
1140 		 * interfaces.
1141 		 */
1142 		BRIDGE_XLOCK(sc);
1143 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1144  			if (in6ifa_llaonifp(bif->bif_ifp)) {
1145 				BRIDGE_UNLOCK(sc);
1146 				in6_ifdetach(bif->bif_ifp);
1147 				BRIDGE_LOCK(sc);
1148 				if_printf(sc->sc_ifp,
1149 				    "IPv6 addresses on %s have been removed "
1150 				    "before adding it as a member to prevent "
1151 				    "IPv6 address scope violation.\n",
1152 				    bif->bif_ifp->if_xname);
1153 			}
1154 		}
1155 		BRIDGE_XDROP(sc);
1156 		if (in6ifa_llaonifp(ifs)) {
1157 			BRIDGE_UNLOCK(sc);
1158 			in6_ifdetach(ifs);
1159 			BRIDGE_LOCK(sc);
1160 			if_printf(sc->sc_ifp,
1161 			    "IPv6 addresses on %s have been removed "
1162 			    "before adding it as a member to prevent "
1163 			    "IPv6 address scope violation.\n",
1164 			    ifs->if_xname);
1165 		}
1166 	}
1167 #endif
1168 	/* Allow the first Ethernet member to define the MTU */
1169 	if (LIST_EMPTY(&sc->sc_iflist))
1170 		sc->sc_ifp->if_mtu = ifs->if_mtu;
1171 	else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1172 		if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1173 		    ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1174 		return (EINVAL);
1175 	}
1176 
1177 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1178 	if (bif == NULL)
1179 		return (ENOMEM);
1180 
1181 	bif->bif_ifp = ifs;
1182 	bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1183 	bif->bif_savedcaps = ifs->if_capenable;
1184 
1185 	/*
1186 	 * Assign the interface's MAC address to the bridge if it's the first
1187 	 * member and the MAC address of the bridge has not been changed from
1188 	 * the default randomly generated one.
1189 	 */
1190 	if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1191 	    !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1192 		bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1193 		sc->sc_ifaddr = ifs;
1194 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1195 	}
1196 
1197 	ifs->if_bridge = sc;
1198 	ifs->if_bridge_output = bridge_output;
1199 	ifs->if_bridge_input = bridge_input;
1200 	ifs->if_bridge_linkstate = bridge_linkstate;
1201 	bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1202 	/*
1203 	 * XXX: XLOCK HERE!?!
1204 	 *
1205 	 * NOTE: insert_***HEAD*** should be safe for the traversals.
1206 	 */
1207 	LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1208 
1209 	/* Set interface capabilities to the intersection set of all members */
1210 	bridge_mutecaps(sc);
1211 	bridge_linkcheck(sc);
1212 
1213 	/* Place the interface into promiscuous mode */
1214 	switch (ifs->if_type) {
1215 		case IFT_ETHER:
1216 		case IFT_L2VLAN:
1217 			BRIDGE_UNLOCK(sc);
1218 			error = ifpromisc(ifs, 1);
1219 			BRIDGE_LOCK(sc);
1220 			break;
1221 	}
1222 
1223 	if (error)
1224 		bridge_delete_member(sc, bif, 0);
1225 	return (error);
1226 }
1227 
1228 static int
1229 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1230 {
1231 	struct ifbreq *req = arg;
1232 	struct bridge_iflist *bif;
1233 
1234 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1235 	if (bif == NULL)
1236 		return (ENOENT);
1237 
1238 	bridge_delete_member(sc, bif, 0);
1239 
1240 	return (0);
1241 }
1242 
1243 static int
1244 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1245 {
1246 	struct ifbreq *req = arg;
1247 	struct bridge_iflist *bif;
1248 	struct bstp_port *bp;
1249 
1250 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1251 	if (bif == NULL)
1252 		return (ENOENT);
1253 
1254 	bp = &bif->bif_stp;
1255 	req->ifbr_ifsflags = bif->bif_flags;
1256 	req->ifbr_state = bp->bp_state;
1257 	req->ifbr_priority = bp->bp_priority;
1258 	req->ifbr_path_cost = bp->bp_path_cost;
1259 	req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1260 	req->ifbr_proto = bp->bp_protover;
1261 	req->ifbr_role = bp->bp_role;
1262 	req->ifbr_stpflags = bp->bp_flags;
1263 	req->ifbr_addrcnt = bif->bif_addrcnt;
1264 	req->ifbr_addrmax = bif->bif_addrmax;
1265 	req->ifbr_addrexceeded = bif->bif_addrexceeded;
1266 
1267 	/* Copy STP state options as flags */
1268 	if (bp->bp_operedge)
1269 		req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1270 	if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1271 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1272 	if (bp->bp_ptp_link)
1273 		req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1274 	if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1275 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1276 	if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1277 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1278 	if (bp->bp_flags & BSTP_PORT_ADMCOST)
1279 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1280 	return (0);
1281 }
1282 
1283 static int
1284 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1285 {
1286 	struct ifbreq *req = arg;
1287 	struct bridge_iflist *bif;
1288 	struct bstp_port *bp;
1289 	int error;
1290 
1291 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1292 	if (bif == NULL)
1293 		return (ENOENT);
1294 	bp = &bif->bif_stp;
1295 
1296 	if (req->ifbr_ifsflags & IFBIF_SPAN)
1297 		/* SPAN is readonly */
1298 		return (EINVAL);
1299 
1300 	if (req->ifbr_ifsflags & IFBIF_STP) {
1301 		if ((bif->bif_flags & IFBIF_STP) == 0) {
1302 			error = bstp_enable(&bif->bif_stp);
1303 			if (error)
1304 				return (error);
1305 		}
1306 	} else {
1307 		if ((bif->bif_flags & IFBIF_STP) != 0)
1308 			bstp_disable(&bif->bif_stp);
1309 	}
1310 
1311 	/* Pass on STP flags */
1312 	bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1313 	bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1314 	bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1315 	bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1316 
1317 	/* Save the bits relating to the bridge */
1318 	bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1319 
1320 	return (0);
1321 }
1322 
1323 static int
1324 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1325 {
1326 	struct ifbrparam *param = arg;
1327 
1328 	sc->sc_brtmax = param->ifbrp_csize;
1329 	bridge_rttrim(sc);
1330 
1331 	return (0);
1332 }
1333 
1334 static int
1335 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1336 {
1337 	struct ifbrparam *param = arg;
1338 
1339 	param->ifbrp_csize = sc->sc_brtmax;
1340 
1341 	return (0);
1342 }
1343 
1344 static int
1345 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1346 {
1347 	struct ifbifconf *bifc = arg;
1348 	struct bridge_iflist *bif;
1349 	struct ifbreq breq;
1350 	char *buf, *outbuf;
1351 	int count, buflen, len, error = 0;
1352 
1353 	count = 0;
1354 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1355 		count++;
1356 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1357 		count++;
1358 
1359 	buflen = sizeof(breq) * count;
1360 	if (bifc->ifbic_len == 0) {
1361 		bifc->ifbic_len = buflen;
1362 		return (0);
1363 	}
1364 	BRIDGE_UNLOCK(sc);
1365 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1366 	BRIDGE_LOCK(sc);
1367 
1368 	count = 0;
1369 	buf = outbuf;
1370 	len = min(bifc->ifbic_len, buflen);
1371 	bzero(&breq, sizeof(breq));
1372 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1373 		if (len < sizeof(breq))
1374 			break;
1375 
1376 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1377 		    sizeof(breq.ifbr_ifsname));
1378 		/* Fill in the ifbreq structure */
1379 		error = bridge_ioctl_gifflags(sc, &breq);
1380 		if (error)
1381 			break;
1382 		memcpy(buf, &breq, sizeof(breq));
1383 		count++;
1384 		buf += sizeof(breq);
1385 		len -= sizeof(breq);
1386 	}
1387 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1388 		if (len < sizeof(breq))
1389 			break;
1390 
1391 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1392 		    sizeof(breq.ifbr_ifsname));
1393 		breq.ifbr_ifsflags = bif->bif_flags;
1394 		breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1395 		memcpy(buf, &breq, sizeof(breq));
1396 		count++;
1397 		buf += sizeof(breq);
1398 		len -= sizeof(breq);
1399 	}
1400 
1401 	BRIDGE_UNLOCK(sc);
1402 	bifc->ifbic_len = sizeof(breq) * count;
1403 	error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1404 	BRIDGE_LOCK(sc);
1405 	free(outbuf, M_TEMP);
1406 	return (error);
1407 }
1408 
1409 static int
1410 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1411 {
1412 	struct ifbaconf *bac = arg;
1413 	struct bridge_rtnode *brt;
1414 	struct ifbareq bareq;
1415 	char *buf, *outbuf;
1416 	int count, buflen, len, error = 0;
1417 
1418 	if (bac->ifbac_len == 0)
1419 		return (0);
1420 
1421 	count = 0;
1422 	LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1423 		count++;
1424 	buflen = sizeof(bareq) * count;
1425 
1426 	BRIDGE_UNLOCK(sc);
1427 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1428 	BRIDGE_LOCK(sc);
1429 
1430 	count = 0;
1431 	buf = outbuf;
1432 	len = min(bac->ifbac_len, buflen);
1433 	bzero(&bareq, sizeof(bareq));
1434 	LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1435 		if (len < sizeof(bareq))
1436 			goto out;
1437 		strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1438 		    sizeof(bareq.ifba_ifsname));
1439 		memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1440 		bareq.ifba_vlan = brt->brt_vlan;
1441 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1442 				time_uptime < brt->brt_expire)
1443 			bareq.ifba_expire = brt->brt_expire - time_uptime;
1444 		else
1445 			bareq.ifba_expire = 0;
1446 		bareq.ifba_flags = brt->brt_flags;
1447 
1448 		memcpy(buf, &bareq, sizeof(bareq));
1449 		count++;
1450 		buf += sizeof(bareq);
1451 		len -= sizeof(bareq);
1452 	}
1453 out:
1454 	BRIDGE_UNLOCK(sc);
1455 	bac->ifbac_len = sizeof(bareq) * count;
1456 	error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1457 	BRIDGE_LOCK(sc);
1458 	free(outbuf, M_TEMP);
1459 	return (error);
1460 }
1461 
1462 static int
1463 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1464 {
1465 	struct ifbareq *req = arg;
1466 	struct bridge_iflist *bif;
1467 	int error;
1468 
1469 	bif = bridge_lookup_member(sc, req->ifba_ifsname);
1470 	if (bif == NULL)
1471 		return (ENOENT);
1472 
1473 	error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1474 	    req->ifba_flags);
1475 
1476 	return (error);
1477 }
1478 
1479 static int
1480 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1481 {
1482 	struct ifbrparam *param = arg;
1483 
1484 	sc->sc_brttimeout = param->ifbrp_ctime;
1485 	return (0);
1486 }
1487 
1488 static int
1489 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1490 {
1491 	struct ifbrparam *param = arg;
1492 
1493 	param->ifbrp_ctime = sc->sc_brttimeout;
1494 	return (0);
1495 }
1496 
1497 static int
1498 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1499 {
1500 	struct ifbareq *req = arg;
1501 
1502 	return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1503 }
1504 
1505 static int
1506 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1507 {
1508 	struct ifbreq *req = arg;
1509 
1510 	bridge_rtflush(sc, req->ifbr_ifsflags);
1511 	return (0);
1512 }
1513 
1514 static int
1515 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1516 {
1517 	struct ifbrparam *param = arg;
1518 	struct bstp_state *bs = &sc->sc_stp;
1519 
1520 	param->ifbrp_prio = bs->bs_bridge_priority;
1521 	return (0);
1522 }
1523 
1524 static int
1525 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1526 {
1527 	struct ifbrparam *param = arg;
1528 
1529 	return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1530 }
1531 
1532 static int
1533 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1534 {
1535 	struct ifbrparam *param = arg;
1536 	struct bstp_state *bs = &sc->sc_stp;
1537 
1538 	param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1539 	return (0);
1540 }
1541 
1542 static int
1543 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1544 {
1545 	struct ifbrparam *param = arg;
1546 
1547 	return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1548 }
1549 
1550 static int
1551 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1552 {
1553 	struct ifbrparam *param = arg;
1554 	struct bstp_state *bs = &sc->sc_stp;
1555 
1556 	param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1557 	return (0);
1558 }
1559 
1560 static int
1561 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1562 {
1563 	struct ifbrparam *param = arg;
1564 
1565 	return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1566 }
1567 
1568 static int
1569 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1570 {
1571 	struct ifbrparam *param = arg;
1572 	struct bstp_state *bs = &sc->sc_stp;
1573 
1574 	param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1575 	return (0);
1576 }
1577 
1578 static int
1579 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1580 {
1581 	struct ifbrparam *param = arg;
1582 
1583 	return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1584 }
1585 
1586 static int
1587 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1588 {
1589 	struct ifbreq *req = arg;
1590 	struct bridge_iflist *bif;
1591 
1592 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1593 	if (bif == NULL)
1594 		return (ENOENT);
1595 
1596 	return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1597 }
1598 
1599 static int
1600 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1601 {
1602 	struct ifbreq *req = arg;
1603 	struct bridge_iflist *bif;
1604 
1605 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1606 	if (bif == NULL)
1607 		return (ENOENT);
1608 
1609 	return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1610 }
1611 
1612 static int
1613 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1614 {
1615 	struct ifbreq *req = arg;
1616 	struct bridge_iflist *bif;
1617 
1618 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1619 	if (bif == NULL)
1620 		return (ENOENT);
1621 
1622 	bif->bif_addrmax = req->ifbr_addrmax;
1623 	return (0);
1624 }
1625 
1626 static int
1627 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1628 {
1629 	struct ifbreq *req = arg;
1630 	struct bridge_iflist *bif = NULL;
1631 	struct ifnet *ifs;
1632 
1633 	ifs = ifunit(req->ifbr_ifsname);
1634 	if (ifs == NULL)
1635 		return (ENOENT);
1636 
1637 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1638 		if (ifs == bif->bif_ifp)
1639 			return (EBUSY);
1640 
1641 	if (ifs->if_bridge != NULL)
1642 		return (EBUSY);
1643 
1644 	switch (ifs->if_type) {
1645 		case IFT_ETHER:
1646 		case IFT_GIF:
1647 		case IFT_L2VLAN:
1648 			break;
1649 		default:
1650 			return (EINVAL);
1651 	}
1652 
1653 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1654 	if (bif == NULL)
1655 		return (ENOMEM);
1656 
1657 	bif->bif_ifp = ifs;
1658 	bif->bif_flags = IFBIF_SPAN;
1659 
1660 	LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1661 
1662 	return (0);
1663 }
1664 
1665 static int
1666 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1667 {
1668 	struct ifbreq *req = arg;
1669 	struct bridge_iflist *bif;
1670 	struct ifnet *ifs;
1671 
1672 	ifs = ifunit(req->ifbr_ifsname);
1673 	if (ifs == NULL)
1674 		return (ENOENT);
1675 
1676 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1677 		if (ifs == bif->bif_ifp)
1678 			break;
1679 
1680 	if (bif == NULL)
1681 		return (ENOENT);
1682 
1683 	bridge_delete_span(sc, bif);
1684 
1685 	return (0);
1686 }
1687 
1688 static int
1689 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1690 {
1691 	struct ifbropreq *req = arg;
1692 	struct bstp_state *bs = &sc->sc_stp;
1693 	struct bstp_port *root_port;
1694 
1695 	req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1696 	req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1697 	req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1698 
1699 	root_port = bs->bs_root_port;
1700 	if (root_port == NULL)
1701 		req->ifbop_root_port = 0;
1702 	else
1703 		req->ifbop_root_port = root_port->bp_ifp->if_index;
1704 
1705 	req->ifbop_holdcount = bs->bs_txholdcount;
1706 	req->ifbop_priority = bs->bs_bridge_priority;
1707 	req->ifbop_protocol = bs->bs_protover;
1708 	req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1709 	req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1710 	req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1711 	req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1712 	req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1713 	req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1714 
1715 	return (0);
1716 }
1717 
1718 static int
1719 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1720 {
1721 	struct ifbrparam *param = arg;
1722 
1723 	param->ifbrp_cexceeded = sc->sc_brtexceeded;
1724 	return (0);
1725 }
1726 
1727 static int
1728 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1729 {
1730 	struct ifbpstpconf *bifstp = arg;
1731 	struct bridge_iflist *bif;
1732 	struct bstp_port *bp;
1733 	struct ifbpstpreq bpreq;
1734 	char *buf, *outbuf;
1735 	int count, buflen, len, error = 0;
1736 
1737 	count = 0;
1738 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1739 		if ((bif->bif_flags & IFBIF_STP) != 0)
1740 			count++;
1741 	}
1742 
1743 	buflen = sizeof(bpreq) * count;
1744 	if (bifstp->ifbpstp_len == 0) {
1745 		bifstp->ifbpstp_len = buflen;
1746 		return (0);
1747 	}
1748 
1749 	BRIDGE_UNLOCK(sc);
1750 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1751 	BRIDGE_LOCK(sc);
1752 
1753 	count = 0;
1754 	buf = outbuf;
1755 	len = min(bifstp->ifbpstp_len, buflen);
1756 	bzero(&bpreq, sizeof(bpreq));
1757 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1758 		if (len < sizeof(bpreq))
1759 			break;
1760 
1761 		if ((bif->bif_flags & IFBIF_STP) == 0)
1762 			continue;
1763 
1764 		bp = &bif->bif_stp;
1765 		bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1766 		bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1767 		bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1768 		bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1769 		bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1770 		bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1771 
1772 		memcpy(buf, &bpreq, sizeof(bpreq));
1773 		count++;
1774 		buf += sizeof(bpreq);
1775 		len -= sizeof(bpreq);
1776 	}
1777 
1778 	BRIDGE_UNLOCK(sc);
1779 	bifstp->ifbpstp_len = sizeof(bpreq) * count;
1780 	error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1781 	BRIDGE_LOCK(sc);
1782 	free(outbuf, M_TEMP);
1783 	return (error);
1784 }
1785 
1786 static int
1787 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1788 {
1789 	struct ifbrparam *param = arg;
1790 
1791 	return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1792 }
1793 
1794 static int
1795 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1796 {
1797 	struct ifbrparam *param = arg;
1798 
1799 	return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1800 }
1801 
1802 /*
1803  * bridge_ifdetach:
1804  *
1805  *	Detach an interface from a bridge.  Called when a member
1806  *	interface is detaching.
1807  */
1808 static void
1809 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1810 {
1811 	struct bridge_softc *sc = ifp->if_bridge;
1812 	struct bridge_iflist *bif;
1813 
1814 	if (ifp->if_flags & IFF_RENAMING)
1815 		return;
1816 	if (V_bridge_cloner == NULL) {
1817 		/*
1818 		 * This detach handler can be called after
1819 		 * vnet_bridge_uninit().  Just return in that case.
1820 		 */
1821 		return;
1822 	}
1823 	/* Check if the interface is a bridge member */
1824 	if (sc != NULL) {
1825 		BRIDGE_LOCK(sc);
1826 
1827 		bif = bridge_lookup_member_if(sc, ifp);
1828 		if (bif != NULL)
1829 			bridge_delete_member(sc, bif, 1);
1830 
1831 		BRIDGE_UNLOCK(sc);
1832 		return;
1833 	}
1834 
1835 	/* Check if the interface is a span port */
1836 	BRIDGE_LIST_LOCK();
1837 	LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1838 		BRIDGE_LOCK(sc);
1839 		LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1840 			if (ifp == bif->bif_ifp) {
1841 				bridge_delete_span(sc, bif);
1842 				break;
1843 			}
1844 
1845 		BRIDGE_UNLOCK(sc);
1846 	}
1847 	BRIDGE_LIST_UNLOCK();
1848 }
1849 
1850 /*
1851  * bridge_init:
1852  *
1853  *	Initialize a bridge interface.
1854  */
1855 static void
1856 bridge_init(void *xsc)
1857 {
1858 	struct bridge_softc *sc = (struct bridge_softc *)xsc;
1859 	struct ifnet *ifp = sc->sc_ifp;
1860 
1861 	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1862 		return;
1863 
1864 	BRIDGE_LOCK(sc);
1865 	callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1866 	    bridge_timer, sc);
1867 
1868 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
1869 	bstp_init(&sc->sc_stp);		/* Initialize Spanning Tree */
1870 
1871 	BRIDGE_UNLOCK(sc);
1872 }
1873 
1874 /*
1875  * bridge_stop:
1876  *
1877  *	Stop the bridge interface.
1878  */
1879 static void
1880 bridge_stop(struct ifnet *ifp, int disable)
1881 {
1882 	struct bridge_softc *sc = ifp->if_softc;
1883 
1884 	BRIDGE_LOCK_ASSERT(sc);
1885 
1886 	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1887 		return;
1888 
1889 	callout_stop(&sc->sc_brcallout);
1890 	bstp_stop(&sc->sc_stp);
1891 
1892 	bridge_rtflush(sc, IFBF_FLUSHDYN);
1893 
1894 	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1895 }
1896 
1897 /*
1898  * bridge_enqueue:
1899  *
1900  *	Enqueue a packet on a bridge member interface.
1901  *
1902  */
1903 static int
1904 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1905 {
1906 	int len, err = 0;
1907 	short mflags;
1908 	struct mbuf *m0;
1909 
1910 	/* We may be sending a fragment so traverse the mbuf */
1911 	for (; m; m = m0) {
1912 		m0 = m->m_nextpkt;
1913 		m->m_nextpkt = NULL;
1914 		len = m->m_pkthdr.len;
1915 		mflags = m->m_flags;
1916 
1917 		/*
1918 		 * If underlying interface can not do VLAN tag insertion itself
1919 		 * then attach a packet tag that holds it.
1920 		 */
1921 		if ((m->m_flags & M_VLANTAG) &&
1922 		    (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1923 			m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1924 			if (m == NULL) {
1925 				if_printf(dst_ifp,
1926 				    "unable to prepend VLAN header\n");
1927 				if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1928 				continue;
1929 			}
1930 			m->m_flags &= ~M_VLANTAG;
1931 		}
1932 
1933 		M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1934 		if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1935 			m_freem(m0);
1936 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1937 			break;
1938 		}
1939 
1940 		if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1941 		if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1942 		if (mflags & M_MCAST)
1943 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1944 	}
1945 
1946 	return (err);
1947 }
1948 
1949 /*
1950  * bridge_dummynet:
1951  *
1952  * 	Receive a queued packet from dummynet and pass it on to the output
1953  * 	interface.
1954  *
1955  *	The mbuf has the Ethernet header already attached.
1956  */
1957 static void
1958 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1959 {
1960 	struct bridge_softc *sc;
1961 
1962 	sc = ifp->if_bridge;
1963 
1964 	/*
1965 	 * The packet didnt originate from a member interface. This should only
1966 	 * ever happen if a member interface is removed while packets are
1967 	 * queued for it.
1968 	 */
1969 	if (sc == NULL) {
1970 		m_freem(m);
1971 		return;
1972 	}
1973 
1974 	if (PFIL_HOOKED_OUT(V_inet_pfil_head)
1975 #ifdef INET6
1976 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
1977 #endif
1978 	    ) {
1979 		if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1980 			return;
1981 		if (m == NULL)
1982 			return;
1983 	}
1984 
1985 	bridge_enqueue(sc, ifp, m);
1986 }
1987 
1988 /*
1989  * bridge_output:
1990  *
1991  *	Send output from a bridge member interface.  This
1992  *	performs the bridging function for locally originated
1993  *	packets.
1994  *
1995  *	The mbuf has the Ethernet header already attached.  We must
1996  *	enqueue or free the mbuf before returning.
1997  */
1998 static int
1999 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2000     struct rtentry *rt)
2001 {
2002 	struct ether_header *eh;
2003 	struct ifnet *bifp, *dst_if;
2004 	struct bridge_softc *sc;
2005 	uint16_t vlan;
2006 
2007 	if (m->m_len < ETHER_HDR_LEN) {
2008 		m = m_pullup(m, ETHER_HDR_LEN);
2009 		if (m == NULL)
2010 			return (0);
2011 	}
2012 
2013 	eh = mtod(m, struct ether_header *);
2014 	sc = ifp->if_bridge;
2015 	vlan = VLANTAGOF(m);
2016 
2017 	BRIDGE_LOCK(sc);
2018 	bifp = sc->sc_ifp;
2019 
2020 	/*
2021 	 * If bridge is down, but the original output interface is up,
2022 	 * go ahead and send out that interface.  Otherwise, the packet
2023 	 * is dropped below.
2024 	 */
2025 	if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2026 		dst_if = ifp;
2027 		goto sendunicast;
2028 	}
2029 
2030 	/*
2031 	 * If the packet is a multicast, or we don't know a better way to
2032 	 * get there, send to all interfaces.
2033 	 */
2034 	if (ETHER_IS_MULTICAST(eh->ether_dhost))
2035 		dst_if = NULL;
2036 	else
2037 		dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2038 	/* Tap any traffic not passing back out the originating interface */
2039 	if (dst_if != ifp)
2040 		ETHER_BPF_MTAP(bifp, m);
2041 	if (dst_if == NULL) {
2042 		struct bridge_iflist *bif;
2043 		struct mbuf *mc;
2044 		int error = 0, used = 0;
2045 
2046 		bridge_span(sc, m);
2047 
2048 		BRIDGE_LOCK2REF(sc, error);
2049 		if (error) {
2050 			m_freem(m);
2051 			return (0);
2052 		}
2053 
2054 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2055 			dst_if = bif->bif_ifp;
2056 
2057 			if (dst_if->if_type == IFT_GIF)
2058 				continue;
2059 			if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2060 				continue;
2061 
2062 			/*
2063 			 * If this is not the original output interface,
2064 			 * and the interface is participating in spanning
2065 			 * tree, make sure the port is in a state that
2066 			 * allows forwarding.
2067 			 */
2068 			if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2069 			    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2070 				continue;
2071 
2072 			if (LIST_NEXT(bif, bif_next) == NULL) {
2073 				used = 1;
2074 				mc = m;
2075 			} else {
2076 				mc = m_copypacket(m, M_NOWAIT);
2077 				if (mc == NULL) {
2078 					if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2079 					continue;
2080 				}
2081 			}
2082 
2083 			bridge_enqueue(sc, dst_if, mc);
2084 		}
2085 		if (used == 0)
2086 			m_freem(m);
2087 		BRIDGE_UNREF(sc);
2088 		return (0);
2089 	}
2090 
2091 sendunicast:
2092 	/*
2093 	 * XXX Spanning tree consideration here?
2094 	 */
2095 
2096 	bridge_span(sc, m);
2097 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2098 		m_freem(m);
2099 		BRIDGE_UNLOCK(sc);
2100 		return (0);
2101 	}
2102 
2103 	BRIDGE_UNLOCK(sc);
2104 	bridge_enqueue(sc, dst_if, m);
2105 	return (0);
2106 }
2107 
2108 /*
2109  * bridge_transmit:
2110  *
2111  *	Do output on a bridge.
2112  *
2113  */
2114 static int
2115 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2116 {
2117 	struct bridge_softc *sc;
2118 	struct ether_header *eh;
2119 	struct ifnet *dst_if;
2120 	int error = 0;
2121 
2122 	sc = ifp->if_softc;
2123 
2124 	ETHER_BPF_MTAP(ifp, m);
2125 
2126 	eh = mtod(m, struct ether_header *);
2127 
2128 	BRIDGE_LOCK(sc);
2129 	if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2130 	    (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2131 		BRIDGE_UNLOCK(sc);
2132 		error = bridge_enqueue(sc, dst_if, m);
2133 	} else
2134 		bridge_broadcast(sc, ifp, m, 0);
2135 
2136 	return (error);
2137 }
2138 
2139 /*
2140  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2141  */
2142 static void
2143 bridge_qflush(struct ifnet *ifp __unused)
2144 {
2145 }
2146 
2147 /*
2148  * bridge_forward:
2149  *
2150  *	The forwarding function of the bridge.
2151  *
2152  *	NOTE: Releases the lock on return.
2153  */
2154 static void
2155 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2156     struct mbuf *m)
2157 {
2158 	struct bridge_iflist *dbif;
2159 	struct ifnet *src_if, *dst_if, *ifp;
2160 	struct ether_header *eh;
2161 	uint16_t vlan;
2162 	uint8_t *dst;
2163 	int error;
2164 
2165 	src_if = m->m_pkthdr.rcvif;
2166 	ifp = sc->sc_ifp;
2167 
2168 	if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2169 	if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2170 	vlan = VLANTAGOF(m);
2171 
2172 	if ((sbif->bif_flags & IFBIF_STP) &&
2173 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2174 		goto drop;
2175 
2176 	eh = mtod(m, struct ether_header *);
2177 	dst = eh->ether_dhost;
2178 
2179 	/* If the interface is learning, record the address. */
2180 	if (sbif->bif_flags & IFBIF_LEARNING) {
2181 		error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2182 		    sbif, 0, IFBAF_DYNAMIC);
2183 		/*
2184 		 * If the interface has addresses limits then deny any source
2185 		 * that is not in the cache.
2186 		 */
2187 		if (error && sbif->bif_addrmax)
2188 			goto drop;
2189 	}
2190 
2191 	if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2192 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2193 		goto drop;
2194 
2195 	/*
2196 	 * At this point, the port either doesn't participate
2197 	 * in spanning tree or it is in the forwarding state.
2198 	 */
2199 
2200 	/*
2201 	 * If the packet is unicast, destined for someone on
2202 	 * "this" side of the bridge, drop it.
2203 	 */
2204 	if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2205 		dst_if = bridge_rtlookup(sc, dst, vlan);
2206 		if (src_if == dst_if)
2207 			goto drop;
2208 	} else {
2209 		/*
2210 		 * Check if its a reserved multicast address, any address
2211 		 * listed in 802.1D section 7.12.6 may not be forwarded by the
2212 		 * bridge.
2213 		 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2214 		 */
2215 		if (dst[0] == 0x01 && dst[1] == 0x80 &&
2216 		    dst[2] == 0xc2 && dst[3] == 0x00 &&
2217 		    dst[4] == 0x00 && dst[5] <= 0x0f)
2218 			goto drop;
2219 
2220 		/* ...forward it to all interfaces. */
2221 		if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2222 		dst_if = NULL;
2223 	}
2224 
2225 	/*
2226 	 * If we have a destination interface which is a member of our bridge,
2227 	 * OR this is a unicast packet, push it through the bpf(4) machinery.
2228 	 * For broadcast or multicast packets, don't bother because it will
2229 	 * be reinjected into ether_input. We do this before we pass the packets
2230 	 * through the pfil(9) framework, as it is possible that pfil(9) will
2231 	 * drop the packet, or possibly modify it, making it difficult to debug
2232 	 * firewall issues on the bridge.
2233 	 */
2234 	if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2235 		ETHER_BPF_MTAP(ifp, m);
2236 
2237 	/* run the packet filter */
2238 	if (PFIL_HOOKED_IN(V_inet_pfil_head)
2239 #ifdef INET6
2240 	    || PFIL_HOOKED_IN(V_inet6_pfil_head)
2241 #endif
2242 	    ) {
2243 		BRIDGE_UNLOCK(sc);
2244 		if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2245 			return;
2246 		if (m == NULL)
2247 			return;
2248 		BRIDGE_LOCK(sc);
2249 	}
2250 
2251 	if (dst_if == NULL) {
2252 		bridge_broadcast(sc, src_if, m, 1);
2253 		return;
2254 	}
2255 
2256 	/*
2257 	 * At this point, we're dealing with a unicast frame
2258 	 * going to a different interface.
2259 	 */
2260 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2261 		goto drop;
2262 
2263 	dbif = bridge_lookup_member_if(sc, dst_if);
2264 	if (dbif == NULL)
2265 		/* Not a member of the bridge (anymore?) */
2266 		goto drop;
2267 
2268 	/* Private segments can not talk to each other */
2269 	if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2270 		goto drop;
2271 
2272 	if ((dbif->bif_flags & IFBIF_STP) &&
2273 	    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2274 		goto drop;
2275 
2276 	BRIDGE_UNLOCK(sc);
2277 
2278 	if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2279 #ifdef INET6
2280 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2281 #endif
2282 	    ) {
2283 		if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2284 			return;
2285 		if (m == NULL)
2286 			return;
2287 	}
2288 
2289 	bridge_enqueue(sc, dst_if, m);
2290 	return;
2291 
2292 drop:
2293 	BRIDGE_UNLOCK(sc);
2294 	m_freem(m);
2295 }
2296 
2297 /*
2298  * bridge_input:
2299  *
2300  *	Receive input from a member interface.  Queue the packet for
2301  *	bridging if it is not for us.
2302  */
2303 static struct mbuf *
2304 bridge_input(struct ifnet *ifp, struct mbuf *m)
2305 {
2306 	struct bridge_softc *sc = ifp->if_bridge;
2307 	struct bridge_iflist *bif, *bif2;
2308 	struct ifnet *bifp;
2309 	struct ether_header *eh;
2310 	struct mbuf *mc, *mc2;
2311 	uint16_t vlan;
2312 	int error;
2313 
2314 	if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2315 		return (m);
2316 
2317 	bifp = sc->sc_ifp;
2318 	vlan = VLANTAGOF(m);
2319 
2320 	/*
2321 	 * Implement support for bridge monitoring. If this flag has been
2322 	 * set on this interface, discard the packet once we push it through
2323 	 * the bpf(4) machinery, but before we do, increment the byte and
2324 	 * packet counters associated with this interface.
2325 	 */
2326 	if ((bifp->if_flags & IFF_MONITOR) != 0) {
2327 		m->m_pkthdr.rcvif  = bifp;
2328 		ETHER_BPF_MTAP(bifp, m);
2329 		if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2330 		if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2331 		m_freem(m);
2332 		return (NULL);
2333 	}
2334 	BRIDGE_LOCK(sc);
2335 	bif = bridge_lookup_member_if(sc, ifp);
2336 	if (bif == NULL) {
2337 		BRIDGE_UNLOCK(sc);
2338 		return (m);
2339 	}
2340 
2341 	eh = mtod(m, struct ether_header *);
2342 
2343 	bridge_span(sc, m);
2344 
2345 	if (m->m_flags & (M_BCAST|M_MCAST)) {
2346 		/* Tap off 802.1D packets; they do not get forwarded. */
2347 		if (memcmp(eh->ether_dhost, bstp_etheraddr,
2348 		    ETHER_ADDR_LEN) == 0) {
2349 			bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2350 			BRIDGE_UNLOCK(sc);
2351 			return (NULL);
2352 		}
2353 
2354 		if ((bif->bif_flags & IFBIF_STP) &&
2355 		    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2356 			BRIDGE_UNLOCK(sc);
2357 			return (m);
2358 		}
2359 
2360 		/*
2361 		 * Make a deep copy of the packet and enqueue the copy
2362 		 * for bridge processing; return the original packet for
2363 		 * local processing.
2364 		 */
2365 		mc = m_dup(m, M_NOWAIT);
2366 		if (mc == NULL) {
2367 			BRIDGE_UNLOCK(sc);
2368 			return (m);
2369 		}
2370 
2371 		/* Perform the bridge forwarding function with the copy. */
2372 		bridge_forward(sc, bif, mc);
2373 
2374 		/*
2375 		 * Reinject the mbuf as arriving on the bridge so we have a
2376 		 * chance at claiming multicast packets. We can not loop back
2377 		 * here from ether_input as a bridge is never a member of a
2378 		 * bridge.
2379 		 */
2380 		KASSERT(bifp->if_bridge == NULL,
2381 		    ("loop created in bridge_input"));
2382 		mc2 = m_dup(m, M_NOWAIT);
2383 		if (mc2 != NULL) {
2384 			/* Keep the layer3 header aligned */
2385 			int i = min(mc2->m_pkthdr.len, max_protohdr);
2386 			mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2387 		}
2388 		if (mc2 != NULL) {
2389 			mc2->m_pkthdr.rcvif = bifp;
2390 			(*bifp->if_input)(bifp, mc2);
2391 		}
2392 
2393 		/* Return the original packet for local processing. */
2394 		return (m);
2395 	}
2396 
2397 	if ((bif->bif_flags & IFBIF_STP) &&
2398 	    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2399 		BRIDGE_UNLOCK(sc);
2400 		return (m);
2401 	}
2402 
2403 #if (defined(INET) || defined(INET6))
2404 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2405 	|| ((iface)->if_carp \
2406 	    && (*carp_forus_p)((iface), eh->ether_dhost))
2407 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2408 	|| ((iface)->if_carp \
2409 	    && (*carp_forus_p)((iface), eh->ether_shost))
2410 #else
2411 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2412 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2413 #endif
2414 
2415 #ifdef INET6
2416 #   define OR_PFIL_HOOKED_INET6 \
2417 	|| PFIL_HOOKED_IN(V_inet6_pfil_head)
2418 #else
2419 #   define OR_PFIL_HOOKED_INET6
2420 #endif
2421 
2422 #define GRAB_OUR_PACKETS(iface) \
2423 	if ((iface)->if_type == IFT_GIF) \
2424 		continue; \
2425 	/* It is destined for us. */ \
2426 	if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2427 	    OR_CARP_CHECK_WE_ARE_DST((iface))				\
2428 	    ) {								\
2429 		if (bif->bif_flags & IFBIF_LEARNING) {			\
2430 			error = bridge_rtupdate(sc, eh->ether_shost,	\
2431 			    vlan, bif, 0, IFBAF_DYNAMIC);		\
2432 			if (error && bif->bif_addrmax) {		\
2433 				BRIDGE_UNLOCK(sc);			\
2434 				m_freem(m);				\
2435 				return (NULL);				\
2436 			}						\
2437 		}							\
2438 		m->m_pkthdr.rcvif = iface;				\
2439 		if ((iface) == ifp) {					\
2440 			/* Skip bridge processing... src == dest */	\
2441 			BRIDGE_UNLOCK(sc);				\
2442 			return (m);					\
2443 		}							\
2444 		/* It's passing over or to the bridge, locally. */	\
2445 		ETHER_BPF_MTAP(bifp, m);				\
2446 		if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);		\
2447 		if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2448 		/* Filter on the physical interface. */			\
2449 		if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2450 		     OR_PFIL_HOOKED_INET6)) {				\
2451 			if (bridge_pfil(&m, NULL, ifp,			\
2452 			    PFIL_IN) != 0 || m == NULL) {		\
2453 				BRIDGE_UNLOCK(sc);			\
2454 				return (NULL);				\
2455 			}						\
2456 		}							\
2457 		if ((iface) != bifp)					\
2458 			ETHER_BPF_MTAP(iface, m);			\
2459 		BRIDGE_UNLOCK(sc);					\
2460 		return (m);						\
2461 	}								\
2462 									\
2463 	/* We just received a packet that we sent out. */		\
2464 	if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2465 	    OR_CARP_CHECK_WE_ARE_SRC((iface))			\
2466 	    ) {								\
2467 		BRIDGE_UNLOCK(sc);					\
2468 		m_freem(m);						\
2469 		return (NULL);						\
2470 	}
2471 
2472 	/*
2473 	 * Unicast.  Make sure it's not for the bridge.
2474 	 */
2475 	do { GRAB_OUR_PACKETS(bifp) } while (0);
2476 
2477 	/*
2478 	 * Give a chance for ifp at first priority. This will help when	the
2479 	 * packet comes through the interface like VLAN's with the same MACs
2480 	 * on several interfaces from the same bridge. This also will save
2481 	 * some CPU cycles in case the destination interface and the input
2482 	 * interface (eq ifp) are the same.
2483 	 */
2484 	do { GRAB_OUR_PACKETS(ifp) } while (0);
2485 
2486 	/* Now check the all bridge members. */
2487 	LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2488 		GRAB_OUR_PACKETS(bif2->bif_ifp)
2489 	}
2490 
2491 #undef OR_CARP_CHECK_WE_ARE_DST
2492 #undef OR_CARP_CHECK_WE_ARE_SRC
2493 #undef OR_PFIL_HOOKED_INET6
2494 #undef GRAB_OUR_PACKETS
2495 
2496 	/* Perform the bridge forwarding function. */
2497 	bridge_forward(sc, bif, m);
2498 
2499 	return (NULL);
2500 }
2501 
2502 /*
2503  * bridge_broadcast:
2504  *
2505  *	Send a frame to all interfaces that are members of
2506  *	the bridge, except for the one on which the packet
2507  *	arrived.
2508  *
2509  *	NOTE: Releases the lock on return.
2510  */
2511 static void
2512 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2513     struct mbuf *m, int runfilt)
2514 {
2515 	struct bridge_iflist *dbif, *sbif;
2516 	struct mbuf *mc;
2517 	struct ifnet *dst_if;
2518 	int error = 0, used = 0, i;
2519 
2520 	sbif = bridge_lookup_member_if(sc, src_if);
2521 
2522 	BRIDGE_LOCK2REF(sc, error);
2523 	if (error) {
2524 		m_freem(m);
2525 		return;
2526 	}
2527 
2528 	/* Filter on the bridge interface before broadcasting */
2529 	if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2530 #ifdef INET6
2531 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2532 #endif
2533 	    )) {
2534 		if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2535 			goto out;
2536 		if (m == NULL)
2537 			goto out;
2538 	}
2539 
2540 	LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2541 		dst_if = dbif->bif_ifp;
2542 		if (dst_if == src_if)
2543 			continue;
2544 
2545 		/* Private segments can not talk to each other */
2546 		if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2547 			continue;
2548 
2549 		if ((dbif->bif_flags & IFBIF_STP) &&
2550 		    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2551 			continue;
2552 
2553 		if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2554 		    (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2555 			continue;
2556 
2557 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2558 			continue;
2559 
2560 		if (LIST_NEXT(dbif, bif_next) == NULL) {
2561 			mc = m;
2562 			used = 1;
2563 		} else {
2564 			mc = m_dup(m, M_NOWAIT);
2565 			if (mc == NULL) {
2566 				if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2567 				continue;
2568 			}
2569 		}
2570 
2571 		/*
2572 		 * Filter on the output interface. Pass a NULL bridge interface
2573 		 * pointer so we do not redundantly filter on the bridge for
2574 		 * each interface we broadcast on.
2575 		 */
2576 		if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2577 #ifdef INET6
2578 		    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2579 #endif
2580 		    )) {
2581 			if (used == 0) {
2582 				/* Keep the layer3 header aligned */
2583 				i = min(mc->m_pkthdr.len, max_protohdr);
2584 				mc = m_copyup(mc, i, ETHER_ALIGN);
2585 				if (mc == NULL) {
2586 					if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2587 					continue;
2588 				}
2589 			}
2590 			if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2591 				continue;
2592 			if (mc == NULL)
2593 				continue;
2594 		}
2595 
2596 		bridge_enqueue(sc, dst_if, mc);
2597 	}
2598 	if (used == 0)
2599 		m_freem(m);
2600 
2601 out:
2602 	BRIDGE_UNREF(sc);
2603 }
2604 
2605 /*
2606  * bridge_span:
2607  *
2608  *	Duplicate a packet out one or more interfaces that are in span mode,
2609  *	the original mbuf is unmodified.
2610  */
2611 static void
2612 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2613 {
2614 	struct bridge_iflist *bif;
2615 	struct ifnet *dst_if;
2616 	struct mbuf *mc;
2617 
2618 	if (LIST_EMPTY(&sc->sc_spanlist))
2619 		return;
2620 
2621 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2622 		dst_if = bif->bif_ifp;
2623 
2624 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2625 			continue;
2626 
2627 		mc = m_copypacket(m, M_NOWAIT);
2628 		if (mc == NULL) {
2629 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2630 			continue;
2631 		}
2632 
2633 		bridge_enqueue(sc, dst_if, mc);
2634 	}
2635 }
2636 
2637 /*
2638  * bridge_rtupdate:
2639  *
2640  *	Add a bridge routing entry.
2641  */
2642 static int
2643 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2644     struct bridge_iflist *bif, int setflags, uint8_t flags)
2645 {
2646 	struct bridge_rtnode *brt;
2647 	int error;
2648 
2649 	BRIDGE_LOCK_ASSERT(sc);
2650 
2651 	/* Check the source address is valid and not multicast. */
2652 	if (ETHER_IS_MULTICAST(dst) ||
2653 	    (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2654 	     dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2655 		return (EINVAL);
2656 
2657 	/* 802.1p frames map to vlan 1 */
2658 	if (vlan == 0)
2659 		vlan = 1;
2660 
2661 	/*
2662 	 * A route for this destination might already exist.  If so,
2663 	 * update it, otherwise create a new one.
2664 	 */
2665 	if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2666 		if (sc->sc_brtcnt >= sc->sc_brtmax) {
2667 			sc->sc_brtexceeded++;
2668 			return (ENOSPC);
2669 		}
2670 		/* Check per interface address limits (if enabled) */
2671 		if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2672 			bif->bif_addrexceeded++;
2673 			return (ENOSPC);
2674 		}
2675 
2676 		/*
2677 		 * Allocate a new bridge forwarding node, and
2678 		 * initialize the expiration time and Ethernet
2679 		 * address.
2680 		 */
2681 		brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2682 		if (brt == NULL)
2683 			return (ENOMEM);
2684 
2685 		if (bif->bif_flags & IFBIF_STICKY)
2686 			brt->brt_flags = IFBAF_STICKY;
2687 		else
2688 			brt->brt_flags = IFBAF_DYNAMIC;
2689 
2690 		memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2691 		brt->brt_vlan = vlan;
2692 
2693 		if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2694 			uma_zfree(V_bridge_rtnode_zone, brt);
2695 			return (error);
2696 		}
2697 		brt->brt_dst = bif;
2698 		bif->bif_addrcnt++;
2699 	}
2700 
2701 	if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2702 	    brt->brt_dst != bif) {
2703 		brt->brt_dst->bif_addrcnt--;
2704 		brt->brt_dst = bif;
2705 		brt->brt_dst->bif_addrcnt++;
2706 	}
2707 
2708 	if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2709 		brt->brt_expire = time_uptime + sc->sc_brttimeout;
2710 	if (setflags)
2711 		brt->brt_flags = flags;
2712 
2713 	return (0);
2714 }
2715 
2716 /*
2717  * bridge_rtlookup:
2718  *
2719  *	Lookup the destination interface for an address.
2720  */
2721 static struct ifnet *
2722 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2723 {
2724 	struct bridge_rtnode *brt;
2725 
2726 	BRIDGE_LOCK_ASSERT(sc);
2727 
2728 	if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2729 		return (NULL);
2730 
2731 	return (brt->brt_ifp);
2732 }
2733 
2734 /*
2735  * bridge_rttrim:
2736  *
2737  *	Trim the routine table so that we have a number
2738  *	of routing entries less than or equal to the
2739  *	maximum number.
2740  */
2741 static void
2742 bridge_rttrim(struct bridge_softc *sc)
2743 {
2744 	struct bridge_rtnode *brt, *nbrt;
2745 
2746 	BRIDGE_LOCK_ASSERT(sc);
2747 
2748 	/* Make sure we actually need to do this. */
2749 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2750 		return;
2751 
2752 	/* Force an aging cycle; this might trim enough addresses. */
2753 	bridge_rtage(sc);
2754 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2755 		return;
2756 
2757 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2758 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2759 			bridge_rtnode_destroy(sc, brt);
2760 			if (sc->sc_brtcnt <= sc->sc_brtmax)
2761 				return;
2762 		}
2763 	}
2764 }
2765 
2766 /*
2767  * bridge_timer:
2768  *
2769  *	Aging timer for the bridge.
2770  */
2771 static void
2772 bridge_timer(void *arg)
2773 {
2774 	struct bridge_softc *sc = arg;
2775 
2776 	BRIDGE_LOCK_ASSERT(sc);
2777 
2778 	/* Destruction of rtnodes requires a proper vnet context */
2779 	CURVNET_SET(sc->sc_ifp->if_vnet);
2780 	bridge_rtage(sc);
2781 
2782 	if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2783 		callout_reset(&sc->sc_brcallout,
2784 		    bridge_rtable_prune_period * hz, bridge_timer, sc);
2785 	CURVNET_RESTORE();
2786 }
2787 
2788 /*
2789  * bridge_rtage:
2790  *
2791  *	Perform an aging cycle.
2792  */
2793 static void
2794 bridge_rtage(struct bridge_softc *sc)
2795 {
2796 	struct bridge_rtnode *brt, *nbrt;
2797 
2798 	BRIDGE_LOCK_ASSERT(sc);
2799 
2800 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2801 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2802 			if (time_uptime >= brt->brt_expire)
2803 				bridge_rtnode_destroy(sc, brt);
2804 		}
2805 	}
2806 }
2807 
2808 /*
2809  * bridge_rtflush:
2810  *
2811  *	Remove all dynamic addresses from the bridge.
2812  */
2813 static void
2814 bridge_rtflush(struct bridge_softc *sc, int full)
2815 {
2816 	struct bridge_rtnode *brt, *nbrt;
2817 
2818 	BRIDGE_LOCK_ASSERT(sc);
2819 
2820 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2821 		if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2822 			bridge_rtnode_destroy(sc, brt);
2823 	}
2824 }
2825 
2826 /*
2827  * bridge_rtdaddr:
2828  *
2829  *	Remove an address from the table.
2830  */
2831 static int
2832 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2833 {
2834 	struct bridge_rtnode *brt;
2835 	int found = 0;
2836 
2837 	BRIDGE_LOCK_ASSERT(sc);
2838 
2839 	/*
2840 	 * If vlan is zero then we want to delete for all vlans so the lookup
2841 	 * may return more than one.
2842 	 */
2843 	while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2844 		bridge_rtnode_destroy(sc, brt);
2845 		found = 1;
2846 	}
2847 
2848 	return (found ? 0 : ENOENT);
2849 }
2850 
2851 /*
2852  * bridge_rtdelete:
2853  *
2854  *	Delete routes to a speicifc member interface.
2855  */
2856 static void
2857 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2858 {
2859 	struct bridge_rtnode *brt, *nbrt;
2860 
2861 	BRIDGE_LOCK_ASSERT(sc);
2862 
2863 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2864 		if (brt->brt_ifp == ifp && (full ||
2865 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2866 			bridge_rtnode_destroy(sc, brt);
2867 	}
2868 }
2869 
2870 /*
2871  * bridge_rtable_init:
2872  *
2873  *	Initialize the route table for this bridge.
2874  */
2875 static void
2876 bridge_rtable_init(struct bridge_softc *sc)
2877 {
2878 	int i;
2879 
2880 	sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2881 	    M_DEVBUF, M_WAITOK);
2882 
2883 	for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2884 		LIST_INIT(&sc->sc_rthash[i]);
2885 
2886 	sc->sc_rthash_key = arc4random();
2887 	LIST_INIT(&sc->sc_rtlist);
2888 }
2889 
2890 /*
2891  * bridge_rtable_fini:
2892  *
2893  *	Deconstruct the route table for this bridge.
2894  */
2895 static void
2896 bridge_rtable_fini(struct bridge_softc *sc)
2897 {
2898 
2899 	KASSERT(sc->sc_brtcnt == 0,
2900 	    ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2901 	free(sc->sc_rthash, M_DEVBUF);
2902 }
2903 
2904 /*
2905  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2906  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2907  */
2908 #define	mix(a, b, c)							\
2909 do {									\
2910 	a -= b; a -= c; a ^= (c >> 13);					\
2911 	b -= c; b -= a; b ^= (a << 8);					\
2912 	c -= a; c -= b; c ^= (b >> 13);					\
2913 	a -= b; a -= c; a ^= (c >> 12);					\
2914 	b -= c; b -= a; b ^= (a << 16);					\
2915 	c -= a; c -= b; c ^= (b >> 5);					\
2916 	a -= b; a -= c; a ^= (c >> 3);					\
2917 	b -= c; b -= a; b ^= (a << 10);					\
2918 	c -= a; c -= b; c ^= (b >> 15);					\
2919 } while (/*CONSTCOND*/0)
2920 
2921 static __inline uint32_t
2922 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2923 {
2924 	uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2925 
2926 	b += addr[5] << 8;
2927 	b += addr[4];
2928 	a += addr[3] << 24;
2929 	a += addr[2] << 16;
2930 	a += addr[1] << 8;
2931 	a += addr[0];
2932 
2933 	mix(a, b, c);
2934 
2935 	return (c & BRIDGE_RTHASH_MASK);
2936 }
2937 
2938 #undef mix
2939 
2940 static int
2941 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2942 {
2943 	int i, d;
2944 
2945 	for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2946 		d = ((int)a[i]) - ((int)b[i]);
2947 	}
2948 
2949 	return (d);
2950 }
2951 
2952 /*
2953  * bridge_rtnode_lookup:
2954  *
2955  *	Look up a bridge route node for the specified destination. Compare the
2956  *	vlan id or if zero then just return the first match.
2957  */
2958 static struct bridge_rtnode *
2959 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2960 {
2961 	struct bridge_rtnode *brt;
2962 	uint32_t hash;
2963 	int dir;
2964 
2965 	BRIDGE_LOCK_ASSERT(sc);
2966 
2967 	hash = bridge_rthash(sc, addr);
2968 	LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2969 		dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2970 		if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2971 			return (brt);
2972 		if (dir > 0)
2973 			return (NULL);
2974 	}
2975 
2976 	return (NULL);
2977 }
2978 
2979 /*
2980  * bridge_rtnode_insert:
2981  *
2982  *	Insert the specified bridge node into the route table.  We
2983  *	assume the entry is not already in the table.
2984  */
2985 static int
2986 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2987 {
2988 	struct bridge_rtnode *lbrt;
2989 	uint32_t hash;
2990 	int dir;
2991 
2992 	BRIDGE_LOCK_ASSERT(sc);
2993 
2994 	hash = bridge_rthash(sc, brt->brt_addr);
2995 
2996 	lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2997 	if (lbrt == NULL) {
2998 		LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2999 		goto out;
3000 	}
3001 
3002 	do {
3003 		dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3004 		if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3005 			return (EEXIST);
3006 		if (dir > 0) {
3007 			LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3008 			goto out;
3009 		}
3010 		if (LIST_NEXT(lbrt, brt_hash) == NULL) {
3011 			LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3012 			goto out;
3013 		}
3014 		lbrt = LIST_NEXT(lbrt, brt_hash);
3015 	} while (lbrt != NULL);
3016 
3017 #ifdef DIAGNOSTIC
3018 	panic("bridge_rtnode_insert: impossible");
3019 #endif
3020 
3021 out:
3022 	LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3023 	sc->sc_brtcnt++;
3024 
3025 	return (0);
3026 }
3027 
3028 /*
3029  * bridge_rtnode_destroy:
3030  *
3031  *	Destroy a bridge rtnode.
3032  */
3033 static void
3034 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3035 {
3036 	BRIDGE_LOCK_ASSERT(sc);
3037 
3038 	LIST_REMOVE(brt, brt_hash);
3039 
3040 	LIST_REMOVE(brt, brt_list);
3041 	sc->sc_brtcnt--;
3042 	brt->brt_dst->bif_addrcnt--;
3043 	uma_zfree(V_bridge_rtnode_zone, brt);
3044 }
3045 
3046 /*
3047  * bridge_rtable_expire:
3048  *
3049  *	Set the expiry time for all routes on an interface.
3050  */
3051 static void
3052 bridge_rtable_expire(struct ifnet *ifp, int age)
3053 {
3054 	struct bridge_softc *sc = ifp->if_bridge;
3055 	struct bridge_rtnode *brt;
3056 
3057 	CURVNET_SET(ifp->if_vnet);
3058 	BRIDGE_LOCK(sc);
3059 
3060 	/*
3061 	 * If the age is zero then flush, otherwise set all the expiry times to
3062 	 * age for the interface
3063 	 */
3064 	if (age == 0)
3065 		bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3066 	else {
3067 		LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3068 			/* Cap the expiry time to 'age' */
3069 			if (brt->brt_ifp == ifp &&
3070 			    brt->brt_expire > time_uptime + age &&
3071 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3072 				brt->brt_expire = time_uptime + age;
3073 		}
3074 	}
3075 	BRIDGE_UNLOCK(sc);
3076 	CURVNET_RESTORE();
3077 }
3078 
3079 /*
3080  * bridge_state_change:
3081  *
3082  *	Callback from the bridgestp code when a port changes states.
3083  */
3084 static void
3085 bridge_state_change(struct ifnet *ifp, int state)
3086 {
3087 	struct bridge_softc *sc = ifp->if_bridge;
3088 	static const char *stpstates[] = {
3089 		"disabled",
3090 		"listening",
3091 		"learning",
3092 		"forwarding",
3093 		"blocking",
3094 		"discarding"
3095 	};
3096 
3097 	CURVNET_SET(ifp->if_vnet);
3098 	if (V_log_stp)
3099 		log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3100 		    sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3101 	CURVNET_RESTORE();
3102 }
3103 
3104 /*
3105  * Send bridge packets through pfil if they are one of the types pfil can deal
3106  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3107  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3108  * that interface.
3109  */
3110 static int
3111 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3112 {
3113 	int snap, error, i, hlen;
3114 	struct ether_header *eh1, eh2;
3115 	struct ip *ip;
3116 	struct llc llc1;
3117 	u_int16_t ether_type;
3118 	pfil_return_t rv;
3119 
3120 	snap = 0;
3121 	error = -1;	/* Default error if not error == 0 */
3122 
3123 #if 0
3124 	/* we may return with the IP fields swapped, ensure its not shared */
3125 	KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3126 #endif
3127 
3128 	if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3129 		return (0); /* filtering is disabled */
3130 
3131 	i = min((*mp)->m_pkthdr.len, max_protohdr);
3132 	if ((*mp)->m_len < i) {
3133 	    *mp = m_pullup(*mp, i);
3134 	    if (*mp == NULL) {
3135 		printf("%s: m_pullup failed\n", __func__);
3136 		return (-1);
3137 	    }
3138 	}
3139 
3140 	eh1 = mtod(*mp, struct ether_header *);
3141 	ether_type = ntohs(eh1->ether_type);
3142 
3143 	/*
3144 	 * Check for SNAP/LLC.
3145 	 */
3146 	if (ether_type < ETHERMTU) {
3147 		struct llc *llc2 = (struct llc *)(eh1 + 1);
3148 
3149 		if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3150 		    llc2->llc_dsap == LLC_SNAP_LSAP &&
3151 		    llc2->llc_ssap == LLC_SNAP_LSAP &&
3152 		    llc2->llc_control == LLC_UI) {
3153 			ether_type = htons(llc2->llc_un.type_snap.ether_type);
3154 			snap = 1;
3155 		}
3156 	}
3157 
3158 	/*
3159 	 * If we're trying to filter bridge traffic, don't look at anything
3160 	 * other than IP and ARP traffic.  If the filter doesn't understand
3161 	 * IPv6, don't allow IPv6 through the bridge either.  This is lame
3162 	 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3163 	 * but of course we don't have an AppleTalk filter to begin with.
3164 	 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3165 	 * ARP traffic.)
3166 	 */
3167 	switch (ether_type) {
3168 		case ETHERTYPE_ARP:
3169 		case ETHERTYPE_REVARP:
3170 			if (V_pfil_ipfw_arp == 0)
3171 				return (0); /* Automatically pass */
3172 			break;
3173 
3174 		case ETHERTYPE_IP:
3175 #ifdef INET6
3176 		case ETHERTYPE_IPV6:
3177 #endif /* INET6 */
3178 			break;
3179 		default:
3180 			/*
3181 			 * Check to see if the user wants to pass non-ip
3182 			 * packets, these will not be checked by pfil(9) and
3183 			 * passed unconditionally so the default is to drop.
3184 			 */
3185 			if (V_pfil_onlyip)
3186 				goto bad;
3187 	}
3188 
3189 	/* Run the packet through pfil before stripping link headers */
3190 	if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3191 	    dir == PFIL_OUT && ifp != NULL) {
3192 		switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3193 		case PFIL_DROPPED:
3194 			return (EACCES);
3195 		case PFIL_CONSUMED:
3196 			return (0);
3197 		}
3198 	}
3199 
3200 	/* Strip off the Ethernet header and keep a copy. */
3201 	m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3202 	m_adj(*mp, ETHER_HDR_LEN);
3203 
3204 	/* Strip off snap header, if present */
3205 	if (snap) {
3206 		m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3207 		m_adj(*mp, sizeof(struct llc));
3208 	}
3209 
3210 	/*
3211 	 * Check the IP header for alignment and errors
3212 	 */
3213 	if (dir == PFIL_IN) {
3214 		switch (ether_type) {
3215 			case ETHERTYPE_IP:
3216 				error = bridge_ip_checkbasic(mp);
3217 				break;
3218 #ifdef INET6
3219 			case ETHERTYPE_IPV6:
3220 				error = bridge_ip6_checkbasic(mp);
3221 				break;
3222 #endif /* INET6 */
3223 			default:
3224 				error = 0;
3225 		}
3226 		if (error)
3227 			goto bad;
3228 	}
3229 
3230 	error = 0;
3231 
3232 	/*
3233 	 * Run the packet through pfil
3234 	 */
3235 	rv = PFIL_PASS;
3236 	switch (ether_type) {
3237 	case ETHERTYPE_IP:
3238 		/*
3239 		 * Run pfil on the member interface and the bridge, both can
3240 		 * be skipped by clearing pfil_member or pfil_bridge.
3241 		 *
3242 		 * Keep the order:
3243 		 *   in_if -> bridge_if -> out_if
3244 		 */
3245 		if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3246 		    pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3247 		    PFIL_PASS)
3248 			break;
3249 
3250 		if (V_pfil_member && ifp != NULL && (rv =
3251 		    pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3252 		    PFIL_PASS)
3253 			break;
3254 
3255 		if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3256 		    pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3257 		    PFIL_PASS)
3258 			break;
3259 
3260 		/* check if we need to fragment the packet */
3261 		/* bridge_fragment generates a mbuf chain of packets */
3262 		/* that already include eth headers */
3263 		if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3264 			i = (*mp)->m_pkthdr.len;
3265 			if (i > ifp->if_mtu) {
3266 				error = bridge_fragment(ifp, mp, &eh2, snap,
3267 					    &llc1);
3268 				return (error);
3269 			}
3270 		}
3271 
3272 		/* Recalculate the ip checksum. */
3273 		ip = mtod(*mp, struct ip *);
3274 		hlen = ip->ip_hl << 2;
3275 		if (hlen < sizeof(struct ip))
3276 			goto bad;
3277 		if (hlen > (*mp)->m_len) {
3278 			if ((*mp = m_pullup(*mp, hlen)) == NULL)
3279 				goto bad;
3280 			ip = mtod(*mp, struct ip *);
3281 			if (ip == NULL)
3282 				goto bad;
3283 		}
3284 		ip->ip_sum = 0;
3285 		if (hlen == sizeof(struct ip))
3286 			ip->ip_sum = in_cksum_hdr(ip);
3287 		else
3288 			ip->ip_sum = in_cksum(*mp, hlen);
3289 
3290 		break;
3291 #ifdef INET6
3292 	case ETHERTYPE_IPV6:
3293 		if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3294 		    pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3295 		    PFIL_PASS)
3296 			break;
3297 
3298 		if (V_pfil_member && ifp != NULL && (rv =
3299 		    pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3300 		    PFIL_PASS)
3301 			break;
3302 
3303 		if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3304 		    pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3305 		    PFIL_PASS)
3306 			break;
3307 		break;
3308 #endif
3309 	}
3310 
3311 	switch (rv) {
3312 	case PFIL_CONSUMED:
3313 		return (0);
3314 	case PFIL_DROPPED:
3315 		return (EACCES);
3316 	default:
3317 		break;
3318 	}
3319 
3320 	error = -1;
3321 
3322 	/*
3323 	 * Finally, put everything back the way it was and return
3324 	 */
3325 	if (snap) {
3326 		M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3327 		if (*mp == NULL)
3328 			return (error);
3329 		bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3330 	}
3331 
3332 	M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3333 	if (*mp == NULL)
3334 		return (error);
3335 	bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3336 
3337 	return (0);
3338 
3339 bad:
3340 	m_freem(*mp);
3341 	*mp = NULL;
3342 	return (error);
3343 }
3344 
3345 /*
3346  * Perform basic checks on header size since
3347  * pfil assumes ip_input has already processed
3348  * it for it.  Cut-and-pasted from ip_input.c.
3349  * Given how simple the IPv6 version is,
3350  * does the IPv4 version really need to be
3351  * this complicated?
3352  *
3353  * XXX Should we update ipstat here, or not?
3354  * XXX Right now we update ipstat but not
3355  * XXX csum_counter.
3356  */
3357 static int
3358 bridge_ip_checkbasic(struct mbuf **mp)
3359 {
3360 	struct mbuf *m = *mp;
3361 	struct ip *ip;
3362 	int len, hlen;
3363 	u_short sum;
3364 
3365 	if (*mp == NULL)
3366 		return (-1);
3367 
3368 	if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3369 		if ((m = m_copyup(m, sizeof(struct ip),
3370 			(max_linkhdr + 3) & ~3)) == NULL) {
3371 			/* XXXJRT new stat, please */
3372 			KMOD_IPSTAT_INC(ips_toosmall);
3373 			goto bad;
3374 		}
3375 	} else if (__predict_false(m->m_len < sizeof (struct ip))) {
3376 		if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3377 			KMOD_IPSTAT_INC(ips_toosmall);
3378 			goto bad;
3379 		}
3380 	}
3381 	ip = mtod(m, struct ip *);
3382 	if (ip == NULL) goto bad;
3383 
3384 	if (ip->ip_v != IPVERSION) {
3385 		KMOD_IPSTAT_INC(ips_badvers);
3386 		goto bad;
3387 	}
3388 	hlen = ip->ip_hl << 2;
3389 	if (hlen < sizeof(struct ip)) { /* minimum header length */
3390 		KMOD_IPSTAT_INC(ips_badhlen);
3391 		goto bad;
3392 	}
3393 	if (hlen > m->m_len) {
3394 		if ((m = m_pullup(m, hlen)) == NULL) {
3395 			KMOD_IPSTAT_INC(ips_badhlen);
3396 			goto bad;
3397 		}
3398 		ip = mtod(m, struct ip *);
3399 		if (ip == NULL) goto bad;
3400 	}
3401 
3402 	if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3403 		sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3404 	} else {
3405 		if (hlen == sizeof(struct ip)) {
3406 			sum = in_cksum_hdr(ip);
3407 		} else {
3408 			sum = in_cksum(m, hlen);
3409 		}
3410 	}
3411 	if (sum) {
3412 		KMOD_IPSTAT_INC(ips_badsum);
3413 		goto bad;
3414 	}
3415 
3416 	/* Retrieve the packet length. */
3417 	len = ntohs(ip->ip_len);
3418 
3419 	/*
3420 	 * Check for additional length bogosity
3421 	 */
3422 	if (len < hlen) {
3423 		KMOD_IPSTAT_INC(ips_badlen);
3424 		goto bad;
3425 	}
3426 
3427 	/*
3428 	 * Check that the amount of data in the buffers
3429 	 * is as at least much as the IP header would have us expect.
3430 	 * Drop packet if shorter than we expect.
3431 	 */
3432 	if (m->m_pkthdr.len < len) {
3433 		KMOD_IPSTAT_INC(ips_tooshort);
3434 		goto bad;
3435 	}
3436 
3437 	/* Checks out, proceed */
3438 	*mp = m;
3439 	return (0);
3440 
3441 bad:
3442 	*mp = m;
3443 	return (-1);
3444 }
3445 
3446 #ifdef INET6
3447 /*
3448  * Same as above, but for IPv6.
3449  * Cut-and-pasted from ip6_input.c.
3450  * XXX Should we update ip6stat, or not?
3451  */
3452 static int
3453 bridge_ip6_checkbasic(struct mbuf **mp)
3454 {
3455 	struct mbuf *m = *mp;
3456 	struct ip6_hdr *ip6;
3457 
3458 	/*
3459 	 * If the IPv6 header is not aligned, slurp it up into a new
3460 	 * mbuf with space for link headers, in the event we forward
3461 	 * it.  Otherwise, if it is aligned, make sure the entire base
3462 	 * IPv6 header is in the first mbuf of the chain.
3463 	 */
3464 	if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3465 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3466 		if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3467 			    (max_linkhdr + 3) & ~3)) == NULL) {
3468 			/* XXXJRT new stat, please */
3469 			IP6STAT_INC(ip6s_toosmall);
3470 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3471 			goto bad;
3472 		}
3473 	} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3474 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3475 		if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3476 			IP6STAT_INC(ip6s_toosmall);
3477 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3478 			goto bad;
3479 		}
3480 	}
3481 
3482 	ip6 = mtod(m, struct ip6_hdr *);
3483 
3484 	if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3485 		IP6STAT_INC(ip6s_badvers);
3486 		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3487 		goto bad;
3488 	}
3489 
3490 	/* Checks out, proceed */
3491 	*mp = m;
3492 	return (0);
3493 
3494 bad:
3495 	*mp = m;
3496 	return (-1);
3497 }
3498 #endif /* INET6 */
3499 
3500 /*
3501  * bridge_fragment:
3502  *
3503  *	Fragment mbuf chain in multiple packets and prepend ethernet header.
3504  */
3505 static int
3506 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3507     int snap, struct llc *llc)
3508 {
3509 	struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3510 	struct ip *ip;
3511 	int error = -1;
3512 
3513 	if (m->m_len < sizeof(struct ip) &&
3514 	    (m = m_pullup(m, sizeof(struct ip))) == NULL)
3515 		goto dropit;
3516 	ip = mtod(m, struct ip *);
3517 
3518 	m->m_pkthdr.csum_flags |= CSUM_IP;
3519 	error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3520 	if (error)
3521 		goto dropit;
3522 
3523 	/*
3524 	 * Walk the chain and re-add the Ethernet header for
3525 	 * each mbuf packet.
3526 	 */
3527 	for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3528 		nextpkt = mcur->m_nextpkt;
3529 		mcur->m_nextpkt = NULL;
3530 		if (snap) {
3531 			M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3532 			if (mcur == NULL) {
3533 				error = ENOBUFS;
3534 				if (mprev != NULL)
3535 					mprev->m_nextpkt = nextpkt;
3536 				goto dropit;
3537 			}
3538 			bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3539 		}
3540 
3541 		M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3542 		if (mcur == NULL) {
3543 			error = ENOBUFS;
3544 			if (mprev != NULL)
3545 				mprev->m_nextpkt = nextpkt;
3546 			goto dropit;
3547 		}
3548 		bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3549 
3550 		/*
3551 		 * The previous two M_PREPEND could have inserted one or two
3552 		 * mbufs in front so we have to update the previous packet's
3553 		 * m_nextpkt.
3554 		 */
3555 		mcur->m_nextpkt = nextpkt;
3556 		if (mprev != NULL)
3557 			mprev->m_nextpkt = mcur;
3558 		else {
3559 			/* The first mbuf in the original chain needs to be
3560 			 * updated. */
3561 			*mp = mcur;
3562 		}
3563 		mprev = mcur;
3564 	}
3565 
3566 	KMOD_IPSTAT_INC(ips_fragmented);
3567 	return (error);
3568 
3569 dropit:
3570 	for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3571 		m = mcur->m_nextpkt;
3572 		m_freem(mcur);
3573 	}
3574 	return (error);
3575 }
3576 
3577 static void
3578 bridge_linkstate(struct ifnet *ifp)
3579 {
3580 	struct bridge_softc *sc = ifp->if_bridge;
3581 	struct bridge_iflist *bif;
3582 
3583 	BRIDGE_LOCK(sc);
3584 	bif = bridge_lookup_member_if(sc, ifp);
3585 	if (bif == NULL) {
3586 		BRIDGE_UNLOCK(sc);
3587 		return;
3588 	}
3589 	bridge_linkcheck(sc);
3590 	BRIDGE_UNLOCK(sc);
3591 
3592 	bstp_linkstate(&bif->bif_stp);
3593 }
3594 
3595 static void
3596 bridge_linkcheck(struct bridge_softc *sc)
3597 {
3598 	struct bridge_iflist *bif;
3599 	int new_link, hasls;
3600 
3601 	BRIDGE_LOCK_ASSERT(sc);
3602 	new_link = LINK_STATE_DOWN;
3603 	hasls = 0;
3604 	/* Our link is considered up if at least one of our ports is active */
3605 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3606 		if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3607 			hasls++;
3608 		if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3609 			new_link = LINK_STATE_UP;
3610 			break;
3611 		}
3612 	}
3613 	if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3614 		/* If no interfaces support link-state then we default to up */
3615 		new_link = LINK_STATE_UP;
3616 	}
3617 	if_link_state_change(sc->sc_ifp, new_link);
3618 }
3619