xref: /freebsd/sys/net/if_bridge.c (revision 6966ac055c3b7a39266fb982493330df7a097997)
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 #ifdef INET6
139 /*
140  * XXX: declare here to avoid to include many inet6 related files..
141  * should be more generalized?
142  */
143 extern void	nd6_setmtu(struct ifnet *);
144 #endif
145 
146 /*
147  * Size of the route hash table.  Must be a power of two.
148  */
149 #ifndef BRIDGE_RTHASH_SIZE
150 #define	BRIDGE_RTHASH_SIZE		1024
151 #endif
152 
153 #define	BRIDGE_RTHASH_MASK		(BRIDGE_RTHASH_SIZE - 1)
154 
155 /*
156  * Default maximum number of addresses to cache.
157  */
158 #ifndef BRIDGE_RTABLE_MAX
159 #define	BRIDGE_RTABLE_MAX		2000
160 #endif
161 
162 /*
163  * Timeout (in seconds) for entries learned dynamically.
164  */
165 #ifndef BRIDGE_RTABLE_TIMEOUT
166 #define	BRIDGE_RTABLE_TIMEOUT		(20 * 60)	/* same as ARP */
167 #endif
168 
169 /*
170  * Number of seconds between walks of the route list.
171  */
172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
173 #define	BRIDGE_RTABLE_PRUNE_PERIOD	(5 * 60)
174 #endif
175 
176 /*
177  * List of capabilities to possibly mask on the member interface.
178  */
179 #define	BRIDGE_IFCAPS_MASK		(IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
180 					 IFCAP_TXCSUM_IPV6)
181 
182 /*
183  * List of capabilities to strip
184  */
185 #define	BRIDGE_IFCAPS_STRIP		IFCAP_LRO
186 
187 /*
188  * Bridge interface list entry.
189  */
190 struct bridge_iflist {
191 	LIST_ENTRY(bridge_iflist) bif_next;
192 	struct ifnet		*bif_ifp;	/* member if */
193 	struct bstp_port	bif_stp;	/* STP state */
194 	uint32_t		bif_flags;	/* member if flags */
195 	int			bif_savedcaps;	/* saved capabilities */
196 	uint32_t		bif_addrmax;	/* max # of addresses */
197 	uint32_t		bif_addrcnt;	/* cur. # of addresses */
198 	uint32_t		bif_addrexceeded;/* # of address violations */
199 };
200 
201 /*
202  * Bridge route node.
203  */
204 struct bridge_rtnode {
205 	LIST_ENTRY(bridge_rtnode) brt_hash;	/* hash table linkage */
206 	LIST_ENTRY(bridge_rtnode) brt_list;	/* list linkage */
207 	struct bridge_iflist	*brt_dst;	/* destination if */
208 	unsigned long		brt_expire;	/* expiration time */
209 	uint8_t			brt_flags;	/* address flags */
210 	uint8_t			brt_addr[ETHER_ADDR_LEN];
211 	uint16_t		brt_vlan;	/* vlan id */
212 };
213 #define	brt_ifp			brt_dst->bif_ifp
214 
215 /*
216  * Software state for each bridge.
217  */
218 struct bridge_softc {
219 	struct ifnet		*sc_ifp;	/* make this an interface */
220 	LIST_ENTRY(bridge_softc) sc_list;
221 	struct mtx		sc_mtx;
222 	struct cv		sc_cv;
223 	uint32_t		sc_brtmax;	/* max # of addresses */
224 	uint32_t		sc_brtcnt;	/* cur. # of addresses */
225 	uint32_t		sc_brttimeout;	/* rt timeout in seconds */
226 	struct callout		sc_brcallout;	/* bridge callout */
227 	uint32_t		sc_iflist_ref;	/* refcount for sc_iflist */
228 	uint32_t		sc_iflist_xcnt;	/* refcount for sc_iflist */
229 	LIST_HEAD(, bridge_iflist) sc_iflist;	/* member interface list */
230 	LIST_HEAD(, bridge_rtnode) *sc_rthash;	/* our forwarding table */
231 	LIST_HEAD(, bridge_rtnode) sc_rtlist;	/* list version of above */
232 	uint32_t		sc_rthash_key;	/* key for hash */
233 	LIST_HEAD(, bridge_iflist) sc_spanlist;	/* span ports list */
234 	struct bstp_state	sc_stp;		/* STP state */
235 	uint32_t		sc_brtexceeded;	/* # of cache drops */
236 	struct ifnet		*sc_ifaddr;	/* member mac copied from */
237 	struct ether_addr	sc_defaddr;	/* Default MAC address */
238 };
239 
240 VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
241 #define	V_bridge_list_mtx	VNET(bridge_list_mtx)
242 static eventhandler_tag bridge_detach_cookie;
243 
244 int	bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
245 
246 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
247 #define	V_bridge_rtnode_zone	VNET(bridge_rtnode_zone)
248 
249 static int	bridge_clone_create(struct if_clone *, int, caddr_t);
250 static void	bridge_clone_destroy(struct ifnet *);
251 
252 static int	bridge_ioctl(struct ifnet *, u_long, caddr_t);
253 static void	bridge_mutecaps(struct bridge_softc *);
254 static void	bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
255 		    int);
256 static void	bridge_ifdetach(void *arg __unused, struct ifnet *);
257 static void	bridge_init(void *);
258 static void	bridge_dummynet(struct mbuf *, struct ifnet *);
259 static void	bridge_stop(struct ifnet *, int);
260 static int	bridge_transmit(struct ifnet *, struct mbuf *);
261 static void	bridge_qflush(struct ifnet *);
262 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
263 static int	bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
264 		    struct rtentry *);
265 static int	bridge_enqueue(struct bridge_softc *, struct ifnet *,
266 		    struct mbuf *);
267 static void	bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
268 
269 static void	bridge_forward(struct bridge_softc *, struct bridge_iflist *,
270 		    struct mbuf *m);
271 
272 static void	bridge_timer(void *);
273 
274 static void	bridge_broadcast(struct bridge_softc *, struct ifnet *,
275 		    struct mbuf *, int);
276 static void	bridge_span(struct bridge_softc *, struct mbuf *);
277 
278 static int	bridge_rtupdate(struct bridge_softc *, const uint8_t *,
279 		    uint16_t, struct bridge_iflist *, int, uint8_t);
280 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
281 		    uint16_t);
282 static void	bridge_rttrim(struct bridge_softc *);
283 static void	bridge_rtage(struct bridge_softc *);
284 static void	bridge_rtflush(struct bridge_softc *, int);
285 static int	bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
286 		    uint16_t);
287 
288 static void	bridge_rtable_init(struct bridge_softc *);
289 static void	bridge_rtable_fini(struct bridge_softc *);
290 
291 static int	bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
292 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
293 		    const uint8_t *, uint16_t);
294 static int	bridge_rtnode_insert(struct bridge_softc *,
295 		    struct bridge_rtnode *);
296 static void	bridge_rtnode_destroy(struct bridge_softc *,
297 		    struct bridge_rtnode *);
298 static void	bridge_rtable_expire(struct ifnet *, int);
299 static void	bridge_state_change(struct ifnet *, int);
300 
301 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
302 		    const char *name);
303 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
304 		    struct ifnet *ifp);
305 static void	bridge_delete_member(struct bridge_softc *,
306 		    struct bridge_iflist *, int);
307 static void	bridge_delete_span(struct bridge_softc *,
308 		    struct bridge_iflist *);
309 
310 static int	bridge_ioctl_add(struct bridge_softc *, void *);
311 static int	bridge_ioctl_del(struct bridge_softc *, void *);
312 static int	bridge_ioctl_gifflags(struct bridge_softc *, void *);
313 static int	bridge_ioctl_sifflags(struct bridge_softc *, void *);
314 static int	bridge_ioctl_scache(struct bridge_softc *, void *);
315 static int	bridge_ioctl_gcache(struct bridge_softc *, void *);
316 static int	bridge_ioctl_gifs(struct bridge_softc *, void *);
317 static int	bridge_ioctl_rts(struct bridge_softc *, void *);
318 static int	bridge_ioctl_saddr(struct bridge_softc *, void *);
319 static int	bridge_ioctl_sto(struct bridge_softc *, void *);
320 static int	bridge_ioctl_gto(struct bridge_softc *, void *);
321 static int	bridge_ioctl_daddr(struct bridge_softc *, void *);
322 static int	bridge_ioctl_flush(struct bridge_softc *, void *);
323 static int	bridge_ioctl_gpri(struct bridge_softc *, void *);
324 static int	bridge_ioctl_spri(struct bridge_softc *, void *);
325 static int	bridge_ioctl_ght(struct bridge_softc *, void *);
326 static int	bridge_ioctl_sht(struct bridge_softc *, void *);
327 static int	bridge_ioctl_gfd(struct bridge_softc *, void *);
328 static int	bridge_ioctl_sfd(struct bridge_softc *, void *);
329 static int	bridge_ioctl_gma(struct bridge_softc *, void *);
330 static int	bridge_ioctl_sma(struct bridge_softc *, void *);
331 static int	bridge_ioctl_sifprio(struct bridge_softc *, void *);
332 static int	bridge_ioctl_sifcost(struct bridge_softc *, void *);
333 static int	bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
334 static int	bridge_ioctl_addspan(struct bridge_softc *, void *);
335 static int	bridge_ioctl_delspan(struct bridge_softc *, void *);
336 static int	bridge_ioctl_gbparam(struct bridge_softc *, void *);
337 static int	bridge_ioctl_grte(struct bridge_softc *, void *);
338 static int	bridge_ioctl_gifsstp(struct bridge_softc *, void *);
339 static int	bridge_ioctl_sproto(struct bridge_softc *, void *);
340 static int	bridge_ioctl_stxhc(struct bridge_softc *, void *);
341 static int	bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
342 		    int);
343 static int	bridge_ip_checkbasic(struct mbuf **mp);
344 #ifdef INET6
345 static int	bridge_ip6_checkbasic(struct mbuf **mp);
346 #endif /* INET6 */
347 static int	bridge_fragment(struct ifnet *, struct mbuf **mp,
348 		    struct ether_header *, int, struct llc *);
349 static void	bridge_linkstate(struct ifnet *ifp);
350 static void	bridge_linkcheck(struct bridge_softc *sc);
351 
352 
353 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
354 #define	VLANTAGOF(_m)	\
355     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
356 
357 static struct bstp_cb_ops bridge_ops = {
358 	.bcb_state = bridge_state_change,
359 	.bcb_rtage = bridge_rtable_expire
360 };
361 
362 SYSCTL_DECL(_net_link);
363 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
364 
365 /* only pass IP[46] packets when pfil is enabled */
366 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
367 #define	V_pfil_onlyip	VNET(pfil_onlyip)
368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
369     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
370     "Only pass IP packets when pfil is enabled");
371 
372 /* run pfil hooks on the bridge interface */
373 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
374 #define	V_pfil_bridge	VNET(pfil_bridge)
375 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
376     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
377     "Packet filter on the bridge interface");
378 
379 /* layer2 filter with ipfw */
380 VNET_DEFINE_STATIC(int, pfil_ipfw);
381 #define	V_pfil_ipfw	VNET(pfil_ipfw)
382 
383 /* layer2 ARP filter with ipfw */
384 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
385 #define	V_pfil_ipfw_arp	VNET(pfil_ipfw_arp)
386 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
387     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
388     "Filter ARP packets through IPFW layer2");
389 
390 /* run pfil hooks on the member interface */
391 VNET_DEFINE_STATIC(int, pfil_member) = 1;
392 #define	V_pfil_member	VNET(pfil_member)
393 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
394     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
395     "Packet filter on the member interface");
396 
397 /* run pfil hooks on the physical interface for locally destined packets */
398 VNET_DEFINE_STATIC(int, pfil_local_phys);
399 #define	V_pfil_local_phys	VNET(pfil_local_phys)
400 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
401     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
402     "Packet filter on the physical interface for locally destined packets");
403 
404 /* log STP state changes */
405 VNET_DEFINE_STATIC(int, log_stp);
406 #define	V_log_stp	VNET(log_stp)
407 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
408     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
409     "Log STP state changes");
410 
411 /* share MAC with first bridge member */
412 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
413 #define	V_bridge_inherit_mac	VNET(bridge_inherit_mac)
414 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
415     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
416     "Inherit MAC address from the first bridge member");
417 
418 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
419 #define	V_allow_llz_overlap	VNET(allow_llz_overlap)
420 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
421     CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
422     "Allow overlap of link-local scope "
423     "zones of a bridge interface and the member interfaces");
424 
425 struct bridge_control {
426 	int	(*bc_func)(struct bridge_softc *, void *);
427 	int	bc_argsize;
428 	int	bc_flags;
429 };
430 
431 #define	BC_F_COPYIN		0x01	/* copy arguments in */
432 #define	BC_F_COPYOUT		0x02	/* copy arguments out */
433 #define	BC_F_SUSER		0x04	/* do super-user check */
434 
435 const struct bridge_control bridge_control_table[] = {
436 	{ bridge_ioctl_add,		sizeof(struct ifbreq),
437 	  BC_F_COPYIN|BC_F_SUSER },
438 	{ bridge_ioctl_del,		sizeof(struct ifbreq),
439 	  BC_F_COPYIN|BC_F_SUSER },
440 
441 	{ bridge_ioctl_gifflags,	sizeof(struct ifbreq),
442 	  BC_F_COPYIN|BC_F_COPYOUT },
443 	{ bridge_ioctl_sifflags,	sizeof(struct ifbreq),
444 	  BC_F_COPYIN|BC_F_SUSER },
445 
446 	{ bridge_ioctl_scache,		sizeof(struct ifbrparam),
447 	  BC_F_COPYIN|BC_F_SUSER },
448 	{ bridge_ioctl_gcache,		sizeof(struct ifbrparam),
449 	  BC_F_COPYOUT },
450 
451 	{ bridge_ioctl_gifs,		sizeof(struct ifbifconf),
452 	  BC_F_COPYIN|BC_F_COPYOUT },
453 	{ bridge_ioctl_rts,		sizeof(struct ifbaconf),
454 	  BC_F_COPYIN|BC_F_COPYOUT },
455 
456 	{ bridge_ioctl_saddr,		sizeof(struct ifbareq),
457 	  BC_F_COPYIN|BC_F_SUSER },
458 
459 	{ bridge_ioctl_sto,		sizeof(struct ifbrparam),
460 	  BC_F_COPYIN|BC_F_SUSER },
461 	{ bridge_ioctl_gto,		sizeof(struct ifbrparam),
462 	  BC_F_COPYOUT },
463 
464 	{ bridge_ioctl_daddr,		sizeof(struct ifbareq),
465 	  BC_F_COPYIN|BC_F_SUSER },
466 
467 	{ bridge_ioctl_flush,		sizeof(struct ifbreq),
468 	  BC_F_COPYIN|BC_F_SUSER },
469 
470 	{ bridge_ioctl_gpri,		sizeof(struct ifbrparam),
471 	  BC_F_COPYOUT },
472 	{ bridge_ioctl_spri,		sizeof(struct ifbrparam),
473 	  BC_F_COPYIN|BC_F_SUSER },
474 
475 	{ bridge_ioctl_ght,		sizeof(struct ifbrparam),
476 	  BC_F_COPYOUT },
477 	{ bridge_ioctl_sht,		sizeof(struct ifbrparam),
478 	  BC_F_COPYIN|BC_F_SUSER },
479 
480 	{ bridge_ioctl_gfd,		sizeof(struct ifbrparam),
481 	  BC_F_COPYOUT },
482 	{ bridge_ioctl_sfd,		sizeof(struct ifbrparam),
483 	  BC_F_COPYIN|BC_F_SUSER },
484 
485 	{ bridge_ioctl_gma,		sizeof(struct ifbrparam),
486 	  BC_F_COPYOUT },
487 	{ bridge_ioctl_sma,		sizeof(struct ifbrparam),
488 	  BC_F_COPYIN|BC_F_SUSER },
489 
490 	{ bridge_ioctl_sifprio,		sizeof(struct ifbreq),
491 	  BC_F_COPYIN|BC_F_SUSER },
492 
493 	{ bridge_ioctl_sifcost,		sizeof(struct ifbreq),
494 	  BC_F_COPYIN|BC_F_SUSER },
495 
496 	{ bridge_ioctl_addspan,		sizeof(struct ifbreq),
497 	  BC_F_COPYIN|BC_F_SUSER },
498 	{ bridge_ioctl_delspan,		sizeof(struct ifbreq),
499 	  BC_F_COPYIN|BC_F_SUSER },
500 
501 	{ bridge_ioctl_gbparam,		sizeof(struct ifbropreq),
502 	  BC_F_COPYOUT },
503 
504 	{ bridge_ioctl_grte,		sizeof(struct ifbrparam),
505 	  BC_F_COPYOUT },
506 
507 	{ bridge_ioctl_gifsstp,		sizeof(struct ifbpstpconf),
508 	  BC_F_COPYIN|BC_F_COPYOUT },
509 
510 	{ bridge_ioctl_sproto,		sizeof(struct ifbrparam),
511 	  BC_F_COPYIN|BC_F_SUSER },
512 
513 	{ bridge_ioctl_stxhc,		sizeof(struct ifbrparam),
514 	  BC_F_COPYIN|BC_F_SUSER },
515 
516 	{ bridge_ioctl_sifmaxaddr,	sizeof(struct ifbreq),
517 	  BC_F_COPYIN|BC_F_SUSER },
518 
519 };
520 const int bridge_control_table_size = nitems(bridge_control_table);
521 
522 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
523 #define	V_bridge_list	VNET(bridge_list)
524 #define	BRIDGE_LIST_LOCK_INIT(x)	mtx_init(&V_bridge_list_mtx,	\
525 					    "if_bridge list", NULL, MTX_DEF)
526 #define	BRIDGE_LIST_LOCK_DESTROY(x)	mtx_destroy(&V_bridge_list_mtx)
527 #define	BRIDGE_LIST_LOCK(x)		mtx_lock(&V_bridge_list_mtx)
528 #define	BRIDGE_LIST_UNLOCK(x)		mtx_unlock(&V_bridge_list_mtx)
529 
530 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
531 #define	V_bridge_cloner	VNET(bridge_cloner)
532 
533 static const char bridge_name[] = "bridge";
534 
535 static void
536 vnet_bridge_init(const void *unused __unused)
537 {
538 
539 	V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
540 	    sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
541 	    UMA_ALIGN_PTR, 0);
542 	BRIDGE_LIST_LOCK_INIT();
543 	LIST_INIT(&V_bridge_list);
544 	V_bridge_cloner = if_clone_simple(bridge_name,
545 	    bridge_clone_create, bridge_clone_destroy, 0);
546 }
547 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
548     vnet_bridge_init, NULL);
549 
550 static void
551 vnet_bridge_uninit(const void *unused __unused)
552 {
553 
554 	if_clone_detach(V_bridge_cloner);
555 	V_bridge_cloner = NULL;
556 	BRIDGE_LIST_LOCK_DESTROY();
557 	uma_zdestroy(V_bridge_rtnode_zone);
558 }
559 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
560     vnet_bridge_uninit, NULL);
561 
562 static int
563 bridge_modevent(module_t mod, int type, void *data)
564 {
565 
566 	switch (type) {
567 	case MOD_LOAD:
568 		bridge_dn_p = bridge_dummynet;
569 		bridge_detach_cookie = EVENTHANDLER_REGISTER(
570 		    ifnet_departure_event, bridge_ifdetach, NULL,
571 		    EVENTHANDLER_PRI_ANY);
572 		break;
573 	case MOD_UNLOAD:
574 		EVENTHANDLER_DEREGISTER(ifnet_departure_event,
575 		    bridge_detach_cookie);
576 		bridge_dn_p = NULL;
577 		break;
578 	default:
579 		return (EOPNOTSUPP);
580 	}
581 	return (0);
582 }
583 
584 static moduledata_t bridge_mod = {
585 	"if_bridge",
586 	bridge_modevent,
587 	0
588 };
589 
590 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
591 MODULE_VERSION(if_bridge, 1);
592 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
593 
594 /*
595  * handler for net.link.bridge.ipfw
596  */
597 static int
598 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
599 {
600 	int enable = V_pfil_ipfw;
601 	int error;
602 
603 	error = sysctl_handle_int(oidp, &enable, 0, req);
604 	enable &= 1;
605 
606 	if (enable != V_pfil_ipfw) {
607 		V_pfil_ipfw = enable;
608 
609 		/*
610 		 * Disable pfil so that ipfw doesnt run twice, if the user
611 		 * really wants both then they can re-enable pfil_bridge and/or
612 		 * pfil_member. Also allow non-ip packets as ipfw can filter by
613 		 * layer2 type.
614 		 */
615 		if (V_pfil_ipfw) {
616 			V_pfil_onlyip = 0;
617 			V_pfil_bridge = 0;
618 			V_pfil_member = 0;
619 		}
620 	}
621 
622 	return (error);
623 }
624 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
625     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
626     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
627     "Layer2 filter with IPFW");
628 
629 /*
630  * bridge_clone_create:
631  *
632  *	Create a new bridge instance.
633  */
634 static int
635 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
636 {
637 	struct bridge_softc *sc, *sc2;
638 	struct ifnet *bifp, *ifp;
639 	int fb, retry;
640 	unsigned long hostid;
641 
642 	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
643 	ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
644 	if (ifp == NULL) {
645 		free(sc, M_DEVBUF);
646 		return (ENOSPC);
647 	}
648 
649 	BRIDGE_LOCK_INIT(sc);
650 	sc->sc_brtmax = BRIDGE_RTABLE_MAX;
651 	sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
652 
653 	/* Initialize our routing table. */
654 	bridge_rtable_init(sc);
655 
656 	callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
657 
658 	LIST_INIT(&sc->sc_iflist);
659 	LIST_INIT(&sc->sc_spanlist);
660 
661 	ifp->if_softc = sc;
662 	if_initname(ifp, bridge_name, unit);
663 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
664 	ifp->if_ioctl = bridge_ioctl;
665 	ifp->if_transmit = bridge_transmit;
666 	ifp->if_qflush = bridge_qflush;
667 	ifp->if_init = bridge_init;
668 	ifp->if_type = IFT_BRIDGE;
669 
670 	/*
671 	 * Generate an ethernet address with a locally administered address.
672 	 *
673 	 * Since we are using random ethernet addresses for the bridge, it is
674 	 * possible that we might have address collisions, so make sure that
675 	 * this hardware address isn't already in use on another bridge.
676 	 * The first try uses the hostid and falls back to arc4rand().
677 	 */
678 	fb = 0;
679 	getcredhostid(curthread->td_ucred, &hostid);
680 	do {
681 		if (fb || hostid == 0) {
682 			ether_gen_addr(ifp, &sc->sc_defaddr);
683 		} else {
684 			sc->sc_defaddr.octet[0] = 0x2;
685 			sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff;
686 			sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff;
687 			sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff;
688 			sc->sc_defaddr.octet[4] =  hostid        & 0xff;
689 			sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff;
690 		}
691 
692 		fb = 1;
693 		retry = 0;
694 		BRIDGE_LIST_LOCK();
695 		LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
696 			bifp = sc2->sc_ifp;
697 			if (memcmp(sc->sc_defaddr.octet,
698 			    IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
699 				retry = 1;
700 				break;
701 			}
702 		}
703 		BRIDGE_LIST_UNLOCK();
704 	} while (retry == 1);
705 
706 	bstp_attach(&sc->sc_stp, &bridge_ops);
707 	ether_ifattach(ifp, sc->sc_defaddr.octet);
708 	/* Now undo some of the damage... */
709 	ifp->if_baudrate = 0;
710 	ifp->if_type = IFT_BRIDGE;
711 
712 	BRIDGE_LIST_LOCK();
713 	LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
714 	BRIDGE_LIST_UNLOCK();
715 
716 	return (0);
717 }
718 
719 /*
720  * bridge_clone_destroy:
721  *
722  *	Destroy a bridge instance.
723  */
724 static void
725 bridge_clone_destroy(struct ifnet *ifp)
726 {
727 	struct bridge_softc *sc = ifp->if_softc;
728 	struct bridge_iflist *bif;
729 
730 	BRIDGE_LOCK(sc);
731 
732 	bridge_stop(ifp, 1);
733 	ifp->if_flags &= ~IFF_UP;
734 
735 	while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
736 		bridge_delete_member(sc, bif, 0);
737 
738 	while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
739 		bridge_delete_span(sc, bif);
740 	}
741 
742 	/* Tear down the routing table. */
743 	bridge_rtable_fini(sc);
744 
745 	BRIDGE_UNLOCK(sc);
746 
747 	callout_drain(&sc->sc_brcallout);
748 
749 	BRIDGE_LIST_LOCK();
750 	LIST_REMOVE(sc, sc_list);
751 	BRIDGE_LIST_UNLOCK();
752 
753 	bstp_detach(&sc->sc_stp);
754 	ether_ifdetach(ifp);
755 	if_free(ifp);
756 
757 	BRIDGE_LOCK_DESTROY(sc);
758 	free(sc, M_DEVBUF);
759 }
760 
761 /*
762  * bridge_ioctl:
763  *
764  *	Handle a control request from the operator.
765  */
766 static int
767 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
768 {
769 	struct bridge_softc *sc = ifp->if_softc;
770 	struct ifreq *ifr = (struct ifreq *)data;
771 	struct bridge_iflist *bif;
772 	struct thread *td = curthread;
773 	union {
774 		struct ifbreq ifbreq;
775 		struct ifbifconf ifbifconf;
776 		struct ifbareq ifbareq;
777 		struct ifbaconf ifbaconf;
778 		struct ifbrparam ifbrparam;
779 		struct ifbropreq ifbropreq;
780 	} args;
781 	struct ifdrv *ifd = (struct ifdrv *) data;
782 	const struct bridge_control *bc;
783 	int error = 0, oldmtu;
784 
785 	switch (cmd) {
786 
787 	case SIOCADDMULTI:
788 	case SIOCDELMULTI:
789 		break;
790 
791 	case SIOCGDRVSPEC:
792 	case SIOCSDRVSPEC:
793 		if (ifd->ifd_cmd >= bridge_control_table_size) {
794 			error = EINVAL;
795 			break;
796 		}
797 		bc = &bridge_control_table[ifd->ifd_cmd];
798 
799 		if (cmd == SIOCGDRVSPEC &&
800 		    (bc->bc_flags & BC_F_COPYOUT) == 0) {
801 			error = EINVAL;
802 			break;
803 		}
804 		else if (cmd == SIOCSDRVSPEC &&
805 		    (bc->bc_flags & BC_F_COPYOUT) != 0) {
806 			error = EINVAL;
807 			break;
808 		}
809 
810 		if (bc->bc_flags & BC_F_SUSER) {
811 			error = priv_check(td, PRIV_NET_BRIDGE);
812 			if (error)
813 				break;
814 		}
815 
816 		if (ifd->ifd_len != bc->bc_argsize ||
817 		    ifd->ifd_len > sizeof(args)) {
818 			error = EINVAL;
819 			break;
820 		}
821 
822 		bzero(&args, sizeof(args));
823 		if (bc->bc_flags & BC_F_COPYIN) {
824 			error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
825 			if (error)
826 				break;
827 		}
828 
829 		oldmtu = ifp->if_mtu;
830 		BRIDGE_LOCK(sc);
831 		error = (*bc->bc_func)(sc, &args);
832 		BRIDGE_UNLOCK(sc);
833 		if (error)
834 			break;
835 
836 		/*
837 		 * Bridge MTU may change during addition of the first port.
838 		 * If it did, do network layer specific procedure.
839 		 */
840 		if (ifp->if_mtu != oldmtu) {
841 #ifdef INET6
842 			nd6_setmtu(ifp);
843 #endif
844 			rt_updatemtu(ifp);
845 		}
846 
847 		if (bc->bc_flags & BC_F_COPYOUT)
848 			error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
849 
850 		break;
851 
852 	case SIOCSIFFLAGS:
853 		if (!(ifp->if_flags & IFF_UP) &&
854 		    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
855 			/*
856 			 * If interface is marked down and it is running,
857 			 * then stop and disable it.
858 			 */
859 			BRIDGE_LOCK(sc);
860 			bridge_stop(ifp, 1);
861 			BRIDGE_UNLOCK(sc);
862 		} else if ((ifp->if_flags & IFF_UP) &&
863 		    !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
864 			/*
865 			 * If interface is marked up and it is stopped, then
866 			 * start it.
867 			 */
868 			(*ifp->if_init)(sc);
869 		}
870 		break;
871 
872 	case SIOCSIFMTU:
873 		if (ifr->ifr_mtu < 576) {
874 			error = EINVAL;
875 			break;
876 		}
877 		if (LIST_EMPTY(&sc->sc_iflist)) {
878 			sc->sc_ifp->if_mtu = ifr->ifr_mtu;
879 			break;
880 		}
881 		BRIDGE_LOCK(sc);
882 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
883 			if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
884 				log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
885 				    " != %d\n", sc->sc_ifp->if_xname,
886 				    bif->bif_ifp->if_mtu,
887 				    bif->bif_ifp->if_xname, ifr->ifr_mtu);
888 				error = EINVAL;
889 				break;
890 			}
891 		}
892 		if (!error)
893 			sc->sc_ifp->if_mtu = ifr->ifr_mtu;
894 		BRIDGE_UNLOCK(sc);
895 		break;
896 	default:
897 		/*
898 		 * drop the lock as ether_ioctl() will call bridge_start() and
899 		 * cause the lock to be recursed.
900 		 */
901 		error = ether_ioctl(ifp, cmd, data);
902 		break;
903 	}
904 
905 	return (error);
906 }
907 
908 /*
909  * bridge_mutecaps:
910  *
911  *	Clear or restore unwanted capabilities on the member interface
912  */
913 static void
914 bridge_mutecaps(struct bridge_softc *sc)
915 {
916 	struct bridge_iflist *bif;
917 	int enabled, mask;
918 
919 	/* Initial bitmask of capabilities to test */
920 	mask = BRIDGE_IFCAPS_MASK;
921 
922 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
923 		/* Every member must support it or its disabled */
924 		mask &= bif->bif_savedcaps;
925 	}
926 
927 	BRIDGE_XLOCK(sc);
928 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
929 		enabled = bif->bif_ifp->if_capenable;
930 		enabled &= ~BRIDGE_IFCAPS_STRIP;
931 		/* strip off mask bits and enable them again if allowed */
932 		enabled &= ~BRIDGE_IFCAPS_MASK;
933 		enabled |= mask;
934 		BRIDGE_UNLOCK(sc);
935 		bridge_set_ifcap(sc, bif, enabled);
936 		BRIDGE_LOCK(sc);
937 	}
938 	BRIDGE_XDROP(sc);
939 
940 }
941 
942 static void
943 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
944 {
945 	struct ifnet *ifp = bif->bif_ifp;
946 	struct ifreq ifr;
947 	int error, mask, stuck;
948 
949 	BRIDGE_UNLOCK_ASSERT(sc);
950 
951 	bzero(&ifr, sizeof(ifr));
952 	ifr.ifr_reqcap = set;
953 
954 	if (ifp->if_capenable != set) {
955 		error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
956 		if (error)
957 			if_printf(sc->sc_ifp,
958 			    "error setting capabilities on %s: %d\n",
959 			    ifp->if_xname, error);
960 		mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
961 		stuck = ifp->if_capenable & mask & ~set;
962 		if (stuck != 0)
963 			if_printf(sc->sc_ifp,
964 			    "can't disable some capabilities on %s: 0x%x\n",
965 			    ifp->if_xname, stuck);
966 	}
967 }
968 
969 /*
970  * bridge_lookup_member:
971  *
972  *	Lookup a bridge member interface.
973  */
974 static struct bridge_iflist *
975 bridge_lookup_member(struct bridge_softc *sc, const char *name)
976 {
977 	struct bridge_iflist *bif;
978 	struct ifnet *ifp;
979 
980 	BRIDGE_LOCK_ASSERT(sc);
981 
982 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
983 		ifp = bif->bif_ifp;
984 		if (strcmp(ifp->if_xname, name) == 0)
985 			return (bif);
986 	}
987 
988 	return (NULL);
989 }
990 
991 /*
992  * bridge_lookup_member_if:
993  *
994  *	Lookup a bridge member interface by ifnet*.
995  */
996 static struct bridge_iflist *
997 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
998 {
999 	struct bridge_iflist *bif;
1000 
1001 	BRIDGE_LOCK_ASSERT(sc);
1002 
1003 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1004 		if (bif->bif_ifp == member_ifp)
1005 			return (bif);
1006 	}
1007 
1008 	return (NULL);
1009 }
1010 
1011 /*
1012  * bridge_delete_member:
1013  *
1014  *	Delete the specified member interface.
1015  */
1016 static void
1017 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1018     int gone)
1019 {
1020 	struct ifnet *ifs = bif->bif_ifp;
1021 	struct ifnet *fif = NULL;
1022 
1023 	BRIDGE_LOCK_ASSERT(sc);
1024 
1025 	if (bif->bif_flags & IFBIF_STP)
1026 		bstp_disable(&bif->bif_stp);
1027 
1028 	ifs->if_bridge = NULL;
1029 	BRIDGE_XLOCK(sc);
1030 	LIST_REMOVE(bif, bif_next);
1031 	BRIDGE_XDROP(sc);
1032 
1033 	/*
1034 	 * If removing the interface that gave the bridge its mac address, set
1035 	 * the mac address of the bridge to the address of the next member, or
1036 	 * to its default address if no members are left.
1037 	 */
1038 	if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1039 		if (LIST_EMPTY(&sc->sc_iflist)) {
1040 			bcopy(&sc->sc_defaddr,
1041 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1042 			sc->sc_ifaddr = NULL;
1043 		} else {
1044 			fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1045 			bcopy(IF_LLADDR(fif),
1046 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1047 			sc->sc_ifaddr = fif;
1048 		}
1049 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1050 	}
1051 
1052 	bridge_linkcheck(sc);
1053 	bridge_mutecaps(sc);	/* recalcuate now this interface is removed */
1054 	bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1055 	KASSERT(bif->bif_addrcnt == 0,
1056 	    ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1057 
1058 	ifs->if_bridge_output = NULL;
1059 	ifs->if_bridge_input = NULL;
1060 	ifs->if_bridge_linkstate = NULL;
1061 	BRIDGE_UNLOCK(sc);
1062 	if (!gone) {
1063 		switch (ifs->if_type) {
1064 		case IFT_ETHER:
1065 		case IFT_L2VLAN:
1066 			/*
1067 			 * Take the interface out of promiscuous mode, but only
1068 			 * if it was promiscuous in the first place. It might
1069 			 * not be if we're in the bridge_ioctl_add() error path.
1070 			 */
1071 			if (ifs->if_flags & IFF_PROMISC)
1072 				(void) ifpromisc(ifs, 0);
1073 			break;
1074 
1075 		case IFT_GIF:
1076 			break;
1077 
1078 		default:
1079 #ifdef DIAGNOSTIC
1080 			panic("bridge_delete_member: impossible");
1081 #endif
1082 			break;
1083 		}
1084 		/* reneable any interface capabilities */
1085 		bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1086 	}
1087 	bstp_destroy(&bif->bif_stp);	/* prepare to free */
1088 	BRIDGE_LOCK(sc);
1089 	free(bif, M_DEVBUF);
1090 }
1091 
1092 /*
1093  * bridge_delete_span:
1094  *
1095  *	Delete the specified span interface.
1096  */
1097 static void
1098 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1099 {
1100 	BRIDGE_LOCK_ASSERT(sc);
1101 
1102 	KASSERT(bif->bif_ifp->if_bridge == NULL,
1103 	    ("%s: not a span interface", __func__));
1104 
1105 	LIST_REMOVE(bif, bif_next);
1106 	free(bif, M_DEVBUF);
1107 }
1108 
1109 static int
1110 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1111 {
1112 	struct ifbreq *req = arg;
1113 	struct bridge_iflist *bif = NULL;
1114 	struct ifnet *ifs;
1115 	int error = 0;
1116 
1117 	ifs = ifunit(req->ifbr_ifsname);
1118 	if (ifs == NULL)
1119 		return (ENOENT);
1120 	if (ifs->if_ioctl == NULL)	/* must be supported */
1121 		return (EINVAL);
1122 
1123 	/* If it's in the span list, it can't be a member. */
1124 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1125 		if (ifs == bif->bif_ifp)
1126 			return (EBUSY);
1127 
1128 	if (ifs->if_bridge == sc)
1129 		return (EEXIST);
1130 
1131 	if (ifs->if_bridge != NULL)
1132 		return (EBUSY);
1133 
1134 	switch (ifs->if_type) {
1135 	case IFT_ETHER:
1136 	case IFT_L2VLAN:
1137 	case IFT_GIF:
1138 		/* permitted interface types */
1139 		break;
1140 	default:
1141 		return (EINVAL);
1142 	}
1143 
1144 #ifdef INET6
1145 	/*
1146 	 * Two valid inet6 addresses with link-local scope must not be
1147 	 * on the parent interface and the member interfaces at the
1148 	 * same time.  This restriction is needed to prevent violation
1149 	 * of link-local scope zone.  Attempts to add a member
1150 	 * interface which has inet6 addresses when the parent has
1151 	 * inet6 triggers removal of all inet6 addresses on the member
1152 	 * interface.
1153 	 */
1154 
1155 	/* Check if the parent interface has a link-local scope addr. */
1156 	if (V_allow_llz_overlap == 0 &&
1157 	    in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1158 		/*
1159 		 * If any, remove all inet6 addresses from the member
1160 		 * interfaces.
1161 		 */
1162 		BRIDGE_XLOCK(sc);
1163 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1164  			if (in6ifa_llaonifp(bif->bif_ifp)) {
1165 				BRIDGE_UNLOCK(sc);
1166 				in6_ifdetach(bif->bif_ifp);
1167 				BRIDGE_LOCK(sc);
1168 				if_printf(sc->sc_ifp,
1169 				    "IPv6 addresses on %s have been removed "
1170 				    "before adding it as a member to prevent "
1171 				    "IPv6 address scope violation.\n",
1172 				    bif->bif_ifp->if_xname);
1173 			}
1174 		}
1175 		BRIDGE_XDROP(sc);
1176 		if (in6ifa_llaonifp(ifs)) {
1177 			BRIDGE_UNLOCK(sc);
1178 			in6_ifdetach(ifs);
1179 			BRIDGE_LOCK(sc);
1180 			if_printf(sc->sc_ifp,
1181 			    "IPv6 addresses on %s have been removed "
1182 			    "before adding it as a member to prevent "
1183 			    "IPv6 address scope violation.\n",
1184 			    ifs->if_xname);
1185 		}
1186 	}
1187 #endif
1188 	/* Allow the first Ethernet member to define the MTU */
1189 	if (LIST_EMPTY(&sc->sc_iflist))
1190 		sc->sc_ifp->if_mtu = ifs->if_mtu;
1191 	else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1192 		if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1193 		    ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1194 		return (EINVAL);
1195 	}
1196 
1197 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1198 	if (bif == NULL)
1199 		return (ENOMEM);
1200 
1201 	bif->bif_ifp = ifs;
1202 	bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1203 	bif->bif_savedcaps = ifs->if_capenable;
1204 
1205 	/*
1206 	 * Assign the interface's MAC address to the bridge if it's the first
1207 	 * member and the MAC address of the bridge has not been changed from
1208 	 * the default randomly generated one.
1209 	 */
1210 	if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1211 	    !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1212 		bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1213 		sc->sc_ifaddr = ifs;
1214 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1215 	}
1216 
1217 	ifs->if_bridge = sc;
1218 	ifs->if_bridge_output = bridge_output;
1219 	ifs->if_bridge_input = bridge_input;
1220 	ifs->if_bridge_linkstate = bridge_linkstate;
1221 	bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1222 	/*
1223 	 * XXX: XLOCK HERE!?!
1224 	 *
1225 	 * NOTE: insert_***HEAD*** should be safe for the traversals.
1226 	 */
1227 	LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1228 
1229 	/* Set interface capabilities to the intersection set of all members */
1230 	bridge_mutecaps(sc);
1231 	bridge_linkcheck(sc);
1232 
1233 	/* Place the interface into promiscuous mode */
1234 	switch (ifs->if_type) {
1235 		case IFT_ETHER:
1236 		case IFT_L2VLAN:
1237 			BRIDGE_UNLOCK(sc);
1238 			error = ifpromisc(ifs, 1);
1239 			BRIDGE_LOCK(sc);
1240 			break;
1241 	}
1242 
1243 	if (error)
1244 		bridge_delete_member(sc, bif, 0);
1245 	return (error);
1246 }
1247 
1248 static int
1249 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1250 {
1251 	struct ifbreq *req = arg;
1252 	struct bridge_iflist *bif;
1253 
1254 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1255 	if (bif == NULL)
1256 		return (ENOENT);
1257 
1258 	bridge_delete_member(sc, bif, 0);
1259 
1260 	return (0);
1261 }
1262 
1263 static int
1264 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1265 {
1266 	struct ifbreq *req = arg;
1267 	struct bridge_iflist *bif;
1268 	struct bstp_port *bp;
1269 
1270 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1271 	if (bif == NULL)
1272 		return (ENOENT);
1273 
1274 	bp = &bif->bif_stp;
1275 	req->ifbr_ifsflags = bif->bif_flags;
1276 	req->ifbr_state = bp->bp_state;
1277 	req->ifbr_priority = bp->bp_priority;
1278 	req->ifbr_path_cost = bp->bp_path_cost;
1279 	req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1280 	req->ifbr_proto = bp->bp_protover;
1281 	req->ifbr_role = bp->bp_role;
1282 	req->ifbr_stpflags = bp->bp_flags;
1283 	req->ifbr_addrcnt = bif->bif_addrcnt;
1284 	req->ifbr_addrmax = bif->bif_addrmax;
1285 	req->ifbr_addrexceeded = bif->bif_addrexceeded;
1286 
1287 	/* Copy STP state options as flags */
1288 	if (bp->bp_operedge)
1289 		req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1290 	if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1291 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1292 	if (bp->bp_ptp_link)
1293 		req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1294 	if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1295 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1296 	if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1297 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1298 	if (bp->bp_flags & BSTP_PORT_ADMCOST)
1299 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1300 	return (0);
1301 }
1302 
1303 static int
1304 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1305 {
1306 	struct ifbreq *req = arg;
1307 	struct bridge_iflist *bif;
1308 	struct bstp_port *bp;
1309 	int error;
1310 
1311 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1312 	if (bif == NULL)
1313 		return (ENOENT);
1314 	bp = &bif->bif_stp;
1315 
1316 	if (req->ifbr_ifsflags & IFBIF_SPAN)
1317 		/* SPAN is readonly */
1318 		return (EINVAL);
1319 
1320 	if (req->ifbr_ifsflags & IFBIF_STP) {
1321 		if ((bif->bif_flags & IFBIF_STP) == 0) {
1322 			error = bstp_enable(&bif->bif_stp);
1323 			if (error)
1324 				return (error);
1325 		}
1326 	} else {
1327 		if ((bif->bif_flags & IFBIF_STP) != 0)
1328 			bstp_disable(&bif->bif_stp);
1329 	}
1330 
1331 	/* Pass on STP flags */
1332 	bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1333 	bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1334 	bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1335 	bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1336 
1337 	/* Save the bits relating to the bridge */
1338 	bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1339 
1340 	return (0);
1341 }
1342 
1343 static int
1344 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1345 {
1346 	struct ifbrparam *param = arg;
1347 
1348 	sc->sc_brtmax = param->ifbrp_csize;
1349 	bridge_rttrim(sc);
1350 
1351 	return (0);
1352 }
1353 
1354 static int
1355 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1356 {
1357 	struct ifbrparam *param = arg;
1358 
1359 	param->ifbrp_csize = sc->sc_brtmax;
1360 
1361 	return (0);
1362 }
1363 
1364 static int
1365 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1366 {
1367 	struct ifbifconf *bifc = arg;
1368 	struct bridge_iflist *bif;
1369 	struct ifbreq breq;
1370 	char *buf, *outbuf;
1371 	int count, buflen, len, error = 0;
1372 
1373 	count = 0;
1374 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1375 		count++;
1376 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1377 		count++;
1378 
1379 	buflen = sizeof(breq) * count;
1380 	if (bifc->ifbic_len == 0) {
1381 		bifc->ifbic_len = buflen;
1382 		return (0);
1383 	}
1384 	BRIDGE_UNLOCK(sc);
1385 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1386 	BRIDGE_LOCK(sc);
1387 
1388 	count = 0;
1389 	buf = outbuf;
1390 	len = min(bifc->ifbic_len, buflen);
1391 	bzero(&breq, sizeof(breq));
1392 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1393 		if (len < sizeof(breq))
1394 			break;
1395 
1396 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1397 		    sizeof(breq.ifbr_ifsname));
1398 		/* Fill in the ifbreq structure */
1399 		error = bridge_ioctl_gifflags(sc, &breq);
1400 		if (error)
1401 			break;
1402 		memcpy(buf, &breq, sizeof(breq));
1403 		count++;
1404 		buf += sizeof(breq);
1405 		len -= sizeof(breq);
1406 	}
1407 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1408 		if (len < sizeof(breq))
1409 			break;
1410 
1411 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1412 		    sizeof(breq.ifbr_ifsname));
1413 		breq.ifbr_ifsflags = bif->bif_flags;
1414 		breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1415 		memcpy(buf, &breq, sizeof(breq));
1416 		count++;
1417 		buf += sizeof(breq);
1418 		len -= sizeof(breq);
1419 	}
1420 
1421 	BRIDGE_UNLOCK(sc);
1422 	bifc->ifbic_len = sizeof(breq) * count;
1423 	error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1424 	BRIDGE_LOCK(sc);
1425 	free(outbuf, M_TEMP);
1426 	return (error);
1427 }
1428 
1429 static int
1430 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1431 {
1432 	struct ifbaconf *bac = arg;
1433 	struct bridge_rtnode *brt;
1434 	struct ifbareq bareq;
1435 	char *buf, *outbuf;
1436 	int count, buflen, len, error = 0;
1437 
1438 	if (bac->ifbac_len == 0)
1439 		return (0);
1440 
1441 	count = 0;
1442 	LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1443 		count++;
1444 	buflen = sizeof(bareq) * count;
1445 
1446 	BRIDGE_UNLOCK(sc);
1447 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1448 	BRIDGE_LOCK(sc);
1449 
1450 	count = 0;
1451 	buf = outbuf;
1452 	len = min(bac->ifbac_len, buflen);
1453 	bzero(&bareq, sizeof(bareq));
1454 	LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1455 		if (len < sizeof(bareq))
1456 			goto out;
1457 		strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1458 		    sizeof(bareq.ifba_ifsname));
1459 		memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1460 		bareq.ifba_vlan = brt->brt_vlan;
1461 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1462 				time_uptime < brt->brt_expire)
1463 			bareq.ifba_expire = brt->brt_expire - time_uptime;
1464 		else
1465 			bareq.ifba_expire = 0;
1466 		bareq.ifba_flags = brt->brt_flags;
1467 
1468 		memcpy(buf, &bareq, sizeof(bareq));
1469 		count++;
1470 		buf += sizeof(bareq);
1471 		len -= sizeof(bareq);
1472 	}
1473 out:
1474 	BRIDGE_UNLOCK(sc);
1475 	bac->ifbac_len = sizeof(bareq) * count;
1476 	error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1477 	BRIDGE_LOCK(sc);
1478 	free(outbuf, M_TEMP);
1479 	return (error);
1480 }
1481 
1482 static int
1483 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1484 {
1485 	struct ifbareq *req = arg;
1486 	struct bridge_iflist *bif;
1487 	int error;
1488 
1489 	bif = bridge_lookup_member(sc, req->ifba_ifsname);
1490 	if (bif == NULL)
1491 		return (ENOENT);
1492 
1493 	error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1494 	    req->ifba_flags);
1495 
1496 	return (error);
1497 }
1498 
1499 static int
1500 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1501 {
1502 	struct ifbrparam *param = arg;
1503 
1504 	sc->sc_brttimeout = param->ifbrp_ctime;
1505 	return (0);
1506 }
1507 
1508 static int
1509 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1510 {
1511 	struct ifbrparam *param = arg;
1512 
1513 	param->ifbrp_ctime = sc->sc_brttimeout;
1514 	return (0);
1515 }
1516 
1517 static int
1518 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1519 {
1520 	struct ifbareq *req = arg;
1521 
1522 	return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1523 }
1524 
1525 static int
1526 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1527 {
1528 	struct ifbreq *req = arg;
1529 
1530 	bridge_rtflush(sc, req->ifbr_ifsflags);
1531 	return (0);
1532 }
1533 
1534 static int
1535 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1536 {
1537 	struct ifbrparam *param = arg;
1538 	struct bstp_state *bs = &sc->sc_stp;
1539 
1540 	param->ifbrp_prio = bs->bs_bridge_priority;
1541 	return (0);
1542 }
1543 
1544 static int
1545 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1546 {
1547 	struct ifbrparam *param = arg;
1548 
1549 	return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1550 }
1551 
1552 static int
1553 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1554 {
1555 	struct ifbrparam *param = arg;
1556 	struct bstp_state *bs = &sc->sc_stp;
1557 
1558 	param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1559 	return (0);
1560 }
1561 
1562 static int
1563 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1564 {
1565 	struct ifbrparam *param = arg;
1566 
1567 	return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1568 }
1569 
1570 static int
1571 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1572 {
1573 	struct ifbrparam *param = arg;
1574 	struct bstp_state *bs = &sc->sc_stp;
1575 
1576 	param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1577 	return (0);
1578 }
1579 
1580 static int
1581 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1582 {
1583 	struct ifbrparam *param = arg;
1584 
1585 	return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1586 }
1587 
1588 static int
1589 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1590 {
1591 	struct ifbrparam *param = arg;
1592 	struct bstp_state *bs = &sc->sc_stp;
1593 
1594 	param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1595 	return (0);
1596 }
1597 
1598 static int
1599 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1600 {
1601 	struct ifbrparam *param = arg;
1602 
1603 	return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1604 }
1605 
1606 static int
1607 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1608 {
1609 	struct ifbreq *req = arg;
1610 	struct bridge_iflist *bif;
1611 
1612 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1613 	if (bif == NULL)
1614 		return (ENOENT);
1615 
1616 	return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1617 }
1618 
1619 static int
1620 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1621 {
1622 	struct ifbreq *req = arg;
1623 	struct bridge_iflist *bif;
1624 
1625 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1626 	if (bif == NULL)
1627 		return (ENOENT);
1628 
1629 	return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1630 }
1631 
1632 static int
1633 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1634 {
1635 	struct ifbreq *req = arg;
1636 	struct bridge_iflist *bif;
1637 
1638 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1639 	if (bif == NULL)
1640 		return (ENOENT);
1641 
1642 	bif->bif_addrmax = req->ifbr_addrmax;
1643 	return (0);
1644 }
1645 
1646 static int
1647 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1648 {
1649 	struct ifbreq *req = arg;
1650 	struct bridge_iflist *bif = NULL;
1651 	struct ifnet *ifs;
1652 
1653 	ifs = ifunit(req->ifbr_ifsname);
1654 	if (ifs == NULL)
1655 		return (ENOENT);
1656 
1657 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1658 		if (ifs == bif->bif_ifp)
1659 			return (EBUSY);
1660 
1661 	if (ifs->if_bridge != NULL)
1662 		return (EBUSY);
1663 
1664 	switch (ifs->if_type) {
1665 		case IFT_ETHER:
1666 		case IFT_GIF:
1667 		case IFT_L2VLAN:
1668 			break;
1669 		default:
1670 			return (EINVAL);
1671 	}
1672 
1673 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1674 	if (bif == NULL)
1675 		return (ENOMEM);
1676 
1677 	bif->bif_ifp = ifs;
1678 	bif->bif_flags = IFBIF_SPAN;
1679 
1680 	LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1681 
1682 	return (0);
1683 }
1684 
1685 static int
1686 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1687 {
1688 	struct ifbreq *req = arg;
1689 	struct bridge_iflist *bif;
1690 	struct ifnet *ifs;
1691 
1692 	ifs = ifunit(req->ifbr_ifsname);
1693 	if (ifs == NULL)
1694 		return (ENOENT);
1695 
1696 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1697 		if (ifs == bif->bif_ifp)
1698 			break;
1699 
1700 	if (bif == NULL)
1701 		return (ENOENT);
1702 
1703 	bridge_delete_span(sc, bif);
1704 
1705 	return (0);
1706 }
1707 
1708 static int
1709 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1710 {
1711 	struct ifbropreq *req = arg;
1712 	struct bstp_state *bs = &sc->sc_stp;
1713 	struct bstp_port *root_port;
1714 
1715 	req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1716 	req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1717 	req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1718 
1719 	root_port = bs->bs_root_port;
1720 	if (root_port == NULL)
1721 		req->ifbop_root_port = 0;
1722 	else
1723 		req->ifbop_root_port = root_port->bp_ifp->if_index;
1724 
1725 	req->ifbop_holdcount = bs->bs_txholdcount;
1726 	req->ifbop_priority = bs->bs_bridge_priority;
1727 	req->ifbop_protocol = bs->bs_protover;
1728 	req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1729 	req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1730 	req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1731 	req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1732 	req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1733 	req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1734 
1735 	return (0);
1736 }
1737 
1738 static int
1739 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1740 {
1741 	struct ifbrparam *param = arg;
1742 
1743 	param->ifbrp_cexceeded = sc->sc_brtexceeded;
1744 	return (0);
1745 }
1746 
1747 static int
1748 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1749 {
1750 	struct ifbpstpconf *bifstp = arg;
1751 	struct bridge_iflist *bif;
1752 	struct bstp_port *bp;
1753 	struct ifbpstpreq bpreq;
1754 	char *buf, *outbuf;
1755 	int count, buflen, len, error = 0;
1756 
1757 	count = 0;
1758 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1759 		if ((bif->bif_flags & IFBIF_STP) != 0)
1760 			count++;
1761 	}
1762 
1763 	buflen = sizeof(bpreq) * count;
1764 	if (bifstp->ifbpstp_len == 0) {
1765 		bifstp->ifbpstp_len = buflen;
1766 		return (0);
1767 	}
1768 
1769 	BRIDGE_UNLOCK(sc);
1770 	outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1771 	BRIDGE_LOCK(sc);
1772 
1773 	count = 0;
1774 	buf = outbuf;
1775 	len = min(bifstp->ifbpstp_len, buflen);
1776 	bzero(&bpreq, sizeof(bpreq));
1777 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1778 		if (len < sizeof(bpreq))
1779 			break;
1780 
1781 		if ((bif->bif_flags & IFBIF_STP) == 0)
1782 			continue;
1783 
1784 		bp = &bif->bif_stp;
1785 		bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1786 		bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1787 		bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1788 		bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1789 		bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1790 		bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1791 
1792 		memcpy(buf, &bpreq, sizeof(bpreq));
1793 		count++;
1794 		buf += sizeof(bpreq);
1795 		len -= sizeof(bpreq);
1796 	}
1797 
1798 	BRIDGE_UNLOCK(sc);
1799 	bifstp->ifbpstp_len = sizeof(bpreq) * count;
1800 	error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1801 	BRIDGE_LOCK(sc);
1802 	free(outbuf, M_TEMP);
1803 	return (error);
1804 }
1805 
1806 static int
1807 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1808 {
1809 	struct ifbrparam *param = arg;
1810 
1811 	return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1812 }
1813 
1814 static int
1815 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1816 {
1817 	struct ifbrparam *param = arg;
1818 
1819 	return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1820 }
1821 
1822 /*
1823  * bridge_ifdetach:
1824  *
1825  *	Detach an interface from a bridge.  Called when a member
1826  *	interface is detaching.
1827  */
1828 static void
1829 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1830 {
1831 	struct bridge_softc *sc = ifp->if_bridge;
1832 	struct bridge_iflist *bif;
1833 
1834 	if (ifp->if_flags & IFF_RENAMING)
1835 		return;
1836 	if (V_bridge_cloner == NULL) {
1837 		/*
1838 		 * This detach handler can be called after
1839 		 * vnet_bridge_uninit().  Just return in that case.
1840 		 */
1841 		return;
1842 	}
1843 	/* Check if the interface is a bridge member */
1844 	if (sc != NULL) {
1845 		BRIDGE_LOCK(sc);
1846 
1847 		bif = bridge_lookup_member_if(sc, ifp);
1848 		if (bif != NULL)
1849 			bridge_delete_member(sc, bif, 1);
1850 
1851 		BRIDGE_UNLOCK(sc);
1852 		return;
1853 	}
1854 
1855 	/* Check if the interface is a span port */
1856 	BRIDGE_LIST_LOCK();
1857 	LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1858 		BRIDGE_LOCK(sc);
1859 		LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1860 			if (ifp == bif->bif_ifp) {
1861 				bridge_delete_span(sc, bif);
1862 				break;
1863 			}
1864 
1865 		BRIDGE_UNLOCK(sc);
1866 	}
1867 	BRIDGE_LIST_UNLOCK();
1868 }
1869 
1870 /*
1871  * bridge_init:
1872  *
1873  *	Initialize a bridge interface.
1874  */
1875 static void
1876 bridge_init(void *xsc)
1877 {
1878 	struct bridge_softc *sc = (struct bridge_softc *)xsc;
1879 	struct ifnet *ifp = sc->sc_ifp;
1880 
1881 	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1882 		return;
1883 
1884 	BRIDGE_LOCK(sc);
1885 	callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1886 	    bridge_timer, sc);
1887 
1888 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
1889 	bstp_init(&sc->sc_stp);		/* Initialize Spanning Tree */
1890 
1891 	BRIDGE_UNLOCK(sc);
1892 }
1893 
1894 /*
1895  * bridge_stop:
1896  *
1897  *	Stop the bridge interface.
1898  */
1899 static void
1900 bridge_stop(struct ifnet *ifp, int disable)
1901 {
1902 	struct bridge_softc *sc = ifp->if_softc;
1903 
1904 	BRIDGE_LOCK_ASSERT(sc);
1905 
1906 	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1907 		return;
1908 
1909 	callout_stop(&sc->sc_brcallout);
1910 	bstp_stop(&sc->sc_stp);
1911 
1912 	bridge_rtflush(sc, IFBF_FLUSHDYN);
1913 
1914 	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1915 }
1916 
1917 /*
1918  * bridge_enqueue:
1919  *
1920  *	Enqueue a packet on a bridge member interface.
1921  *
1922  */
1923 static int
1924 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1925 {
1926 	int len, err = 0;
1927 	short mflags;
1928 	struct mbuf *m0;
1929 
1930 	/* We may be sending a fragment so traverse the mbuf */
1931 	for (; m; m = m0) {
1932 		m0 = m->m_nextpkt;
1933 		m->m_nextpkt = NULL;
1934 		len = m->m_pkthdr.len;
1935 		mflags = m->m_flags;
1936 
1937 		/*
1938 		 * If underlying interface can not do VLAN tag insertion itself
1939 		 * then attach a packet tag that holds it.
1940 		 */
1941 		if ((m->m_flags & M_VLANTAG) &&
1942 		    (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1943 			m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1944 			if (m == NULL) {
1945 				if_printf(dst_ifp,
1946 				    "unable to prepend VLAN header\n");
1947 				if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1948 				continue;
1949 			}
1950 			m->m_flags &= ~M_VLANTAG;
1951 		}
1952 
1953 		M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1954 		if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1955 			m_freem(m0);
1956 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1957 			break;
1958 		}
1959 
1960 		if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1961 		if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1962 		if (mflags & M_MCAST)
1963 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1964 	}
1965 
1966 	return (err);
1967 }
1968 
1969 /*
1970  * bridge_dummynet:
1971  *
1972  * 	Receive a queued packet from dummynet and pass it on to the output
1973  * 	interface.
1974  *
1975  *	The mbuf has the Ethernet header already attached.
1976  */
1977 static void
1978 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1979 {
1980 	struct bridge_softc *sc;
1981 
1982 	sc = ifp->if_bridge;
1983 
1984 	/*
1985 	 * The packet didnt originate from a member interface. This should only
1986 	 * ever happen if a member interface is removed while packets are
1987 	 * queued for it.
1988 	 */
1989 	if (sc == NULL) {
1990 		m_freem(m);
1991 		return;
1992 	}
1993 
1994 	if (PFIL_HOOKED_OUT(V_inet_pfil_head)
1995 #ifdef INET6
1996 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
1997 #endif
1998 	    ) {
1999 		if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2000 			return;
2001 		if (m == NULL)
2002 			return;
2003 	}
2004 
2005 	bridge_enqueue(sc, ifp, m);
2006 }
2007 
2008 /*
2009  * bridge_output:
2010  *
2011  *	Send output from a bridge member interface.  This
2012  *	performs the bridging function for locally originated
2013  *	packets.
2014  *
2015  *	The mbuf has the Ethernet header already attached.  We must
2016  *	enqueue or free the mbuf before returning.
2017  */
2018 static int
2019 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2020     struct rtentry *rt)
2021 {
2022 	struct ether_header *eh;
2023 	struct ifnet *bifp, *dst_if;
2024 	struct bridge_softc *sc;
2025 	uint16_t vlan;
2026 
2027 	if (m->m_len < ETHER_HDR_LEN) {
2028 		m = m_pullup(m, ETHER_HDR_LEN);
2029 		if (m == NULL)
2030 			return (0);
2031 	}
2032 
2033 	eh = mtod(m, struct ether_header *);
2034 	sc = ifp->if_bridge;
2035 	vlan = VLANTAGOF(m);
2036 
2037 	BRIDGE_LOCK(sc);
2038 	bifp = sc->sc_ifp;
2039 
2040 	/*
2041 	 * If bridge is down, but the original output interface is up,
2042 	 * go ahead and send out that interface.  Otherwise, the packet
2043 	 * is dropped below.
2044 	 */
2045 	if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2046 		dst_if = ifp;
2047 		goto sendunicast;
2048 	}
2049 
2050 	/*
2051 	 * If the packet is a multicast, or we don't know a better way to
2052 	 * get there, send to all interfaces.
2053 	 */
2054 	if (ETHER_IS_MULTICAST(eh->ether_dhost))
2055 		dst_if = NULL;
2056 	else
2057 		dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2058 	/* Tap any traffic not passing back out the originating interface */
2059 	if (dst_if != ifp)
2060 		ETHER_BPF_MTAP(bifp, m);
2061 	if (dst_if == NULL) {
2062 		struct bridge_iflist *bif;
2063 		struct mbuf *mc;
2064 		int error = 0, used = 0;
2065 
2066 		bridge_span(sc, m);
2067 
2068 		BRIDGE_LOCK2REF(sc, error);
2069 		if (error) {
2070 			m_freem(m);
2071 			return (0);
2072 		}
2073 
2074 		LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2075 			dst_if = bif->bif_ifp;
2076 
2077 			if (dst_if->if_type == IFT_GIF)
2078 				continue;
2079 			if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2080 				continue;
2081 
2082 			/*
2083 			 * If this is not the original output interface,
2084 			 * and the interface is participating in spanning
2085 			 * tree, make sure the port is in a state that
2086 			 * allows forwarding.
2087 			 */
2088 			if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2089 			    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2090 				continue;
2091 
2092 			if (LIST_NEXT(bif, bif_next) == NULL) {
2093 				used = 1;
2094 				mc = m;
2095 			} else {
2096 				mc = m_copypacket(m, M_NOWAIT);
2097 				if (mc == NULL) {
2098 					if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2099 					continue;
2100 				}
2101 			}
2102 
2103 			bridge_enqueue(sc, dst_if, mc);
2104 		}
2105 		if (used == 0)
2106 			m_freem(m);
2107 		BRIDGE_UNREF(sc);
2108 		return (0);
2109 	}
2110 
2111 sendunicast:
2112 	/*
2113 	 * XXX Spanning tree consideration here?
2114 	 */
2115 
2116 	bridge_span(sc, m);
2117 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2118 		m_freem(m);
2119 		BRIDGE_UNLOCK(sc);
2120 		return (0);
2121 	}
2122 
2123 	BRIDGE_UNLOCK(sc);
2124 	bridge_enqueue(sc, dst_if, m);
2125 	return (0);
2126 }
2127 
2128 /*
2129  * bridge_transmit:
2130  *
2131  *	Do output on a bridge.
2132  *
2133  */
2134 static int
2135 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2136 {
2137 	struct bridge_softc *sc;
2138 	struct ether_header *eh;
2139 	struct ifnet *dst_if;
2140 	int error = 0;
2141 
2142 	sc = ifp->if_softc;
2143 
2144 	ETHER_BPF_MTAP(ifp, m);
2145 
2146 	eh = mtod(m, struct ether_header *);
2147 
2148 	BRIDGE_LOCK(sc);
2149 	if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2150 	    (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2151 		BRIDGE_UNLOCK(sc);
2152 		error = bridge_enqueue(sc, dst_if, m);
2153 	} else
2154 		bridge_broadcast(sc, ifp, m, 0);
2155 
2156 	return (error);
2157 }
2158 
2159 /*
2160  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2161  */
2162 static void
2163 bridge_qflush(struct ifnet *ifp __unused)
2164 {
2165 }
2166 
2167 /*
2168  * bridge_forward:
2169  *
2170  *	The forwarding function of the bridge.
2171  *
2172  *	NOTE: Releases the lock on return.
2173  */
2174 static void
2175 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2176     struct mbuf *m)
2177 {
2178 	struct bridge_iflist *dbif;
2179 	struct ifnet *src_if, *dst_if, *ifp;
2180 	struct ether_header *eh;
2181 	uint16_t vlan;
2182 	uint8_t *dst;
2183 	int error;
2184 
2185 	src_if = m->m_pkthdr.rcvif;
2186 	ifp = sc->sc_ifp;
2187 
2188 	if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2189 	if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2190 	vlan = VLANTAGOF(m);
2191 
2192 	if ((sbif->bif_flags & IFBIF_STP) &&
2193 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2194 		goto drop;
2195 
2196 	eh = mtod(m, struct ether_header *);
2197 	dst = eh->ether_dhost;
2198 
2199 	/* If the interface is learning, record the address. */
2200 	if (sbif->bif_flags & IFBIF_LEARNING) {
2201 		error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2202 		    sbif, 0, IFBAF_DYNAMIC);
2203 		/*
2204 		 * If the interface has addresses limits then deny any source
2205 		 * that is not in the cache.
2206 		 */
2207 		if (error && sbif->bif_addrmax)
2208 			goto drop;
2209 	}
2210 
2211 	if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2212 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2213 		goto drop;
2214 
2215 	/*
2216 	 * At this point, the port either doesn't participate
2217 	 * in spanning tree or it is in the forwarding state.
2218 	 */
2219 
2220 	/*
2221 	 * If the packet is unicast, destined for someone on
2222 	 * "this" side of the bridge, drop it.
2223 	 */
2224 	if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2225 		dst_if = bridge_rtlookup(sc, dst, vlan);
2226 		if (src_if == dst_if)
2227 			goto drop;
2228 	} else {
2229 		/*
2230 		 * Check if its a reserved multicast address, any address
2231 		 * listed in 802.1D section 7.12.6 may not be forwarded by the
2232 		 * bridge.
2233 		 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2234 		 */
2235 		if (dst[0] == 0x01 && dst[1] == 0x80 &&
2236 		    dst[2] == 0xc2 && dst[3] == 0x00 &&
2237 		    dst[4] == 0x00 && dst[5] <= 0x0f)
2238 			goto drop;
2239 
2240 		/* ...forward it to all interfaces. */
2241 		if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2242 		dst_if = NULL;
2243 	}
2244 
2245 	/*
2246 	 * If we have a destination interface which is a member of our bridge,
2247 	 * OR this is a unicast packet, push it through the bpf(4) machinery.
2248 	 * For broadcast or multicast packets, don't bother because it will
2249 	 * be reinjected into ether_input. We do this before we pass the packets
2250 	 * through the pfil(9) framework, as it is possible that pfil(9) will
2251 	 * drop the packet, or possibly modify it, making it difficult to debug
2252 	 * firewall issues on the bridge.
2253 	 */
2254 	if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2255 		ETHER_BPF_MTAP(ifp, m);
2256 
2257 	/* run the packet filter */
2258 	if (PFIL_HOOKED_IN(V_inet_pfil_head)
2259 #ifdef INET6
2260 	    || PFIL_HOOKED_IN(V_inet6_pfil_head)
2261 #endif
2262 	    ) {
2263 		BRIDGE_UNLOCK(sc);
2264 		if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2265 			return;
2266 		if (m == NULL)
2267 			return;
2268 		BRIDGE_LOCK(sc);
2269 	}
2270 
2271 	if (dst_if == NULL) {
2272 		bridge_broadcast(sc, src_if, m, 1);
2273 		return;
2274 	}
2275 
2276 	/*
2277 	 * At this point, we're dealing with a unicast frame
2278 	 * going to a different interface.
2279 	 */
2280 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2281 		goto drop;
2282 
2283 	dbif = bridge_lookup_member_if(sc, dst_if);
2284 	if (dbif == NULL)
2285 		/* Not a member of the bridge (anymore?) */
2286 		goto drop;
2287 
2288 	/* Private segments can not talk to each other */
2289 	if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2290 		goto drop;
2291 
2292 	if ((dbif->bif_flags & IFBIF_STP) &&
2293 	    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2294 		goto drop;
2295 
2296 	BRIDGE_UNLOCK(sc);
2297 
2298 	if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2299 #ifdef INET6
2300 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2301 #endif
2302 	    ) {
2303 		if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2304 			return;
2305 		if (m == NULL)
2306 			return;
2307 	}
2308 
2309 	bridge_enqueue(sc, dst_if, m);
2310 	return;
2311 
2312 drop:
2313 	BRIDGE_UNLOCK(sc);
2314 	m_freem(m);
2315 }
2316 
2317 /*
2318  * bridge_input:
2319  *
2320  *	Receive input from a member interface.  Queue the packet for
2321  *	bridging if it is not for us.
2322  */
2323 static struct mbuf *
2324 bridge_input(struct ifnet *ifp, struct mbuf *m)
2325 {
2326 	struct bridge_softc *sc = ifp->if_bridge;
2327 	struct bridge_iflist *bif, *bif2;
2328 	struct ifnet *bifp;
2329 	struct ether_header *eh;
2330 	struct mbuf *mc, *mc2;
2331 	uint16_t vlan;
2332 	int error;
2333 
2334 	if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2335 		return (m);
2336 
2337 	bifp = sc->sc_ifp;
2338 	vlan = VLANTAGOF(m);
2339 
2340 	/*
2341 	 * Implement support for bridge monitoring. If this flag has been
2342 	 * set on this interface, discard the packet once we push it through
2343 	 * the bpf(4) machinery, but before we do, increment the byte and
2344 	 * packet counters associated with this interface.
2345 	 */
2346 	if ((bifp->if_flags & IFF_MONITOR) != 0) {
2347 		m->m_pkthdr.rcvif  = bifp;
2348 		ETHER_BPF_MTAP(bifp, m);
2349 		if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2350 		if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2351 		m_freem(m);
2352 		return (NULL);
2353 	}
2354 	BRIDGE_LOCK(sc);
2355 	bif = bridge_lookup_member_if(sc, ifp);
2356 	if (bif == NULL) {
2357 		BRIDGE_UNLOCK(sc);
2358 		return (m);
2359 	}
2360 
2361 	eh = mtod(m, struct ether_header *);
2362 
2363 	bridge_span(sc, m);
2364 
2365 	if (m->m_flags & (M_BCAST|M_MCAST)) {
2366 		/* Tap off 802.1D packets; they do not get forwarded. */
2367 		if (memcmp(eh->ether_dhost, bstp_etheraddr,
2368 		    ETHER_ADDR_LEN) == 0) {
2369 			bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2370 			BRIDGE_UNLOCK(sc);
2371 			return (NULL);
2372 		}
2373 
2374 		if ((bif->bif_flags & IFBIF_STP) &&
2375 		    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2376 			BRIDGE_UNLOCK(sc);
2377 			return (m);
2378 		}
2379 
2380 		/*
2381 		 * Make a deep copy of the packet and enqueue the copy
2382 		 * for bridge processing; return the original packet for
2383 		 * local processing.
2384 		 */
2385 		mc = m_dup(m, M_NOWAIT);
2386 		if (mc == NULL) {
2387 			BRIDGE_UNLOCK(sc);
2388 			return (m);
2389 		}
2390 
2391 		/* Perform the bridge forwarding function with the copy. */
2392 		bridge_forward(sc, bif, mc);
2393 
2394 		/*
2395 		 * Reinject the mbuf as arriving on the bridge so we have a
2396 		 * chance at claiming multicast packets. We can not loop back
2397 		 * here from ether_input as a bridge is never a member of a
2398 		 * bridge.
2399 		 */
2400 		KASSERT(bifp->if_bridge == NULL,
2401 		    ("loop created in bridge_input"));
2402 		mc2 = m_dup(m, M_NOWAIT);
2403 		if (mc2 != NULL) {
2404 			/* Keep the layer3 header aligned */
2405 			int i = min(mc2->m_pkthdr.len, max_protohdr);
2406 			mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2407 		}
2408 		if (mc2 != NULL) {
2409 			mc2->m_pkthdr.rcvif = bifp;
2410 			(*bifp->if_input)(bifp, mc2);
2411 		}
2412 
2413 		/* Return the original packet for local processing. */
2414 		return (m);
2415 	}
2416 
2417 	if ((bif->bif_flags & IFBIF_STP) &&
2418 	    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2419 		BRIDGE_UNLOCK(sc);
2420 		return (m);
2421 	}
2422 
2423 #if (defined(INET) || defined(INET6))
2424 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2425 	|| ((iface)->if_carp \
2426 	    && (*carp_forus_p)((iface), eh->ether_dhost))
2427 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2428 	|| ((iface)->if_carp \
2429 	    && (*carp_forus_p)((iface), eh->ether_shost))
2430 #else
2431 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2432 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2433 #endif
2434 
2435 #ifdef INET6
2436 #   define OR_PFIL_HOOKED_INET6 \
2437 	|| PFIL_HOOKED_IN(V_inet6_pfil_head)
2438 #else
2439 #   define OR_PFIL_HOOKED_INET6
2440 #endif
2441 
2442 #define GRAB_OUR_PACKETS(iface) \
2443 	if ((iface)->if_type == IFT_GIF) \
2444 		continue; \
2445 	/* It is destined for us. */ \
2446 	if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2447 	    OR_CARP_CHECK_WE_ARE_DST((iface))				\
2448 	    ) {								\
2449 		if (bif->bif_flags & IFBIF_LEARNING) {			\
2450 			error = bridge_rtupdate(sc, eh->ether_shost,	\
2451 			    vlan, bif, 0, IFBAF_DYNAMIC);		\
2452 			if (error && bif->bif_addrmax) {		\
2453 				BRIDGE_UNLOCK(sc);			\
2454 				m_freem(m);				\
2455 				return (NULL);				\
2456 			}						\
2457 		}							\
2458 		m->m_pkthdr.rcvif = iface;				\
2459 		if ((iface) == ifp) {					\
2460 			/* Skip bridge processing... src == dest */	\
2461 			BRIDGE_UNLOCK(sc);				\
2462 			return (m);					\
2463 		}							\
2464 		/* It's passing over or to the bridge, locally. */	\
2465 		ETHER_BPF_MTAP(bifp, m);				\
2466 		if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);		\
2467 		if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2468 		/* Filter on the physical interface. */			\
2469 		if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2470 		     OR_PFIL_HOOKED_INET6)) {				\
2471 			if (bridge_pfil(&m, NULL, ifp,			\
2472 			    PFIL_IN) != 0 || m == NULL) {		\
2473 				BRIDGE_UNLOCK(sc);			\
2474 				return (NULL);				\
2475 			}						\
2476 		}							\
2477 		if ((iface) != bifp)					\
2478 			ETHER_BPF_MTAP(iface, m);			\
2479 		BRIDGE_UNLOCK(sc);					\
2480 		return (m);						\
2481 	}								\
2482 									\
2483 	/* We just received a packet that we sent out. */		\
2484 	if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2485 	    OR_CARP_CHECK_WE_ARE_SRC((iface))			\
2486 	    ) {								\
2487 		BRIDGE_UNLOCK(sc);					\
2488 		m_freem(m);						\
2489 		return (NULL);						\
2490 	}
2491 
2492 	/*
2493 	 * Unicast.  Make sure it's not for the bridge.
2494 	 */
2495 	do { GRAB_OUR_PACKETS(bifp) } while (0);
2496 
2497 	/*
2498 	 * Give a chance for ifp at first priority. This will help when	the
2499 	 * packet comes through the interface like VLAN's with the same MACs
2500 	 * on several interfaces from the same bridge. This also will save
2501 	 * some CPU cycles in case the destination interface and the input
2502 	 * interface (eq ifp) are the same.
2503 	 */
2504 	do { GRAB_OUR_PACKETS(ifp) } while (0);
2505 
2506 	/* Now check the all bridge members. */
2507 	LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2508 		GRAB_OUR_PACKETS(bif2->bif_ifp)
2509 	}
2510 
2511 #undef OR_CARP_CHECK_WE_ARE_DST
2512 #undef OR_CARP_CHECK_WE_ARE_SRC
2513 #undef OR_PFIL_HOOKED_INET6
2514 #undef GRAB_OUR_PACKETS
2515 
2516 	/* Perform the bridge forwarding function. */
2517 	bridge_forward(sc, bif, m);
2518 
2519 	return (NULL);
2520 }
2521 
2522 /*
2523  * bridge_broadcast:
2524  *
2525  *	Send a frame to all interfaces that are members of
2526  *	the bridge, except for the one on which the packet
2527  *	arrived.
2528  *
2529  *	NOTE: Releases the lock on return.
2530  */
2531 static void
2532 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2533     struct mbuf *m, int runfilt)
2534 {
2535 	struct bridge_iflist *dbif, *sbif;
2536 	struct mbuf *mc;
2537 	struct ifnet *dst_if;
2538 	int error = 0, used = 0, i;
2539 
2540 	sbif = bridge_lookup_member_if(sc, src_if);
2541 
2542 	BRIDGE_LOCK2REF(sc, error);
2543 	if (error) {
2544 		m_freem(m);
2545 		return;
2546 	}
2547 
2548 	/* Filter on the bridge interface before broadcasting */
2549 	if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2550 #ifdef INET6
2551 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2552 #endif
2553 	    )) {
2554 		if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2555 			goto out;
2556 		if (m == NULL)
2557 			goto out;
2558 	}
2559 
2560 	LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2561 		dst_if = dbif->bif_ifp;
2562 		if (dst_if == src_if)
2563 			continue;
2564 
2565 		/* Private segments can not talk to each other */
2566 		if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2567 			continue;
2568 
2569 		if ((dbif->bif_flags & IFBIF_STP) &&
2570 		    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2571 			continue;
2572 
2573 		if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2574 		    (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2575 			continue;
2576 
2577 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2578 			continue;
2579 
2580 		if (LIST_NEXT(dbif, bif_next) == NULL) {
2581 			mc = m;
2582 			used = 1;
2583 		} else {
2584 			mc = m_dup(m, M_NOWAIT);
2585 			if (mc == NULL) {
2586 				if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2587 				continue;
2588 			}
2589 		}
2590 
2591 		/*
2592 		 * Filter on the output interface. Pass a NULL bridge interface
2593 		 * pointer so we do not redundantly filter on the bridge for
2594 		 * each interface we broadcast on.
2595 		 */
2596 		if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2597 #ifdef INET6
2598 		    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2599 #endif
2600 		    )) {
2601 			if (used == 0) {
2602 				/* Keep the layer3 header aligned */
2603 				i = min(mc->m_pkthdr.len, max_protohdr);
2604 				mc = m_copyup(mc, i, ETHER_ALIGN);
2605 				if (mc == NULL) {
2606 					if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2607 					continue;
2608 				}
2609 			}
2610 			if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2611 				continue;
2612 			if (mc == NULL)
2613 				continue;
2614 		}
2615 
2616 		bridge_enqueue(sc, dst_if, mc);
2617 	}
2618 	if (used == 0)
2619 		m_freem(m);
2620 
2621 out:
2622 	BRIDGE_UNREF(sc);
2623 }
2624 
2625 /*
2626  * bridge_span:
2627  *
2628  *	Duplicate a packet out one or more interfaces that are in span mode,
2629  *	the original mbuf is unmodified.
2630  */
2631 static void
2632 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2633 {
2634 	struct bridge_iflist *bif;
2635 	struct ifnet *dst_if;
2636 	struct mbuf *mc;
2637 
2638 	if (LIST_EMPTY(&sc->sc_spanlist))
2639 		return;
2640 
2641 	LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2642 		dst_if = bif->bif_ifp;
2643 
2644 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2645 			continue;
2646 
2647 		mc = m_copypacket(m, M_NOWAIT);
2648 		if (mc == NULL) {
2649 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2650 			continue;
2651 		}
2652 
2653 		bridge_enqueue(sc, dst_if, mc);
2654 	}
2655 }
2656 
2657 /*
2658  * bridge_rtupdate:
2659  *
2660  *	Add a bridge routing entry.
2661  */
2662 static int
2663 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2664     struct bridge_iflist *bif, int setflags, uint8_t flags)
2665 {
2666 	struct bridge_rtnode *brt;
2667 	int error;
2668 
2669 	BRIDGE_LOCK_ASSERT(sc);
2670 
2671 	/* Check the source address is valid and not multicast. */
2672 	if (ETHER_IS_MULTICAST(dst) ||
2673 	    (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2674 	     dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2675 		return (EINVAL);
2676 
2677 	/* 802.1p frames map to vlan 1 */
2678 	if (vlan == 0)
2679 		vlan = 1;
2680 
2681 	/*
2682 	 * A route for this destination might already exist.  If so,
2683 	 * update it, otherwise create a new one.
2684 	 */
2685 	if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2686 		if (sc->sc_brtcnt >= sc->sc_brtmax) {
2687 			sc->sc_brtexceeded++;
2688 			return (ENOSPC);
2689 		}
2690 		/* Check per interface address limits (if enabled) */
2691 		if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2692 			bif->bif_addrexceeded++;
2693 			return (ENOSPC);
2694 		}
2695 
2696 		/*
2697 		 * Allocate a new bridge forwarding node, and
2698 		 * initialize the expiration time and Ethernet
2699 		 * address.
2700 		 */
2701 		brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2702 		if (brt == NULL)
2703 			return (ENOMEM);
2704 
2705 		if (bif->bif_flags & IFBIF_STICKY)
2706 			brt->brt_flags = IFBAF_STICKY;
2707 		else
2708 			brt->brt_flags = IFBAF_DYNAMIC;
2709 
2710 		memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2711 		brt->brt_vlan = vlan;
2712 
2713 		if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2714 			uma_zfree(V_bridge_rtnode_zone, brt);
2715 			return (error);
2716 		}
2717 		brt->brt_dst = bif;
2718 		bif->bif_addrcnt++;
2719 	}
2720 
2721 	if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2722 	    brt->brt_dst != bif) {
2723 		brt->brt_dst->bif_addrcnt--;
2724 		brt->brt_dst = bif;
2725 		brt->brt_dst->bif_addrcnt++;
2726 	}
2727 
2728 	if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2729 		brt->brt_expire = time_uptime + sc->sc_brttimeout;
2730 	if (setflags)
2731 		brt->brt_flags = flags;
2732 
2733 	return (0);
2734 }
2735 
2736 /*
2737  * bridge_rtlookup:
2738  *
2739  *	Lookup the destination interface for an address.
2740  */
2741 static struct ifnet *
2742 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2743 {
2744 	struct bridge_rtnode *brt;
2745 
2746 	BRIDGE_LOCK_ASSERT(sc);
2747 
2748 	if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2749 		return (NULL);
2750 
2751 	return (brt->brt_ifp);
2752 }
2753 
2754 /*
2755  * bridge_rttrim:
2756  *
2757  *	Trim the routine table so that we have a number
2758  *	of routing entries less than or equal to the
2759  *	maximum number.
2760  */
2761 static void
2762 bridge_rttrim(struct bridge_softc *sc)
2763 {
2764 	struct bridge_rtnode *brt, *nbrt;
2765 
2766 	BRIDGE_LOCK_ASSERT(sc);
2767 
2768 	/* Make sure we actually need to do this. */
2769 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2770 		return;
2771 
2772 	/* Force an aging cycle; this might trim enough addresses. */
2773 	bridge_rtage(sc);
2774 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2775 		return;
2776 
2777 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2778 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2779 			bridge_rtnode_destroy(sc, brt);
2780 			if (sc->sc_brtcnt <= sc->sc_brtmax)
2781 				return;
2782 		}
2783 	}
2784 }
2785 
2786 /*
2787  * bridge_timer:
2788  *
2789  *	Aging timer for the bridge.
2790  */
2791 static void
2792 bridge_timer(void *arg)
2793 {
2794 	struct bridge_softc *sc = arg;
2795 
2796 	BRIDGE_LOCK_ASSERT(sc);
2797 
2798 	/* Destruction of rtnodes requires a proper vnet context */
2799 	CURVNET_SET(sc->sc_ifp->if_vnet);
2800 	bridge_rtage(sc);
2801 
2802 	if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2803 		callout_reset(&sc->sc_brcallout,
2804 		    bridge_rtable_prune_period * hz, bridge_timer, sc);
2805 	CURVNET_RESTORE();
2806 }
2807 
2808 /*
2809  * bridge_rtage:
2810  *
2811  *	Perform an aging cycle.
2812  */
2813 static void
2814 bridge_rtage(struct bridge_softc *sc)
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 ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2822 			if (time_uptime >= brt->brt_expire)
2823 				bridge_rtnode_destroy(sc, brt);
2824 		}
2825 	}
2826 }
2827 
2828 /*
2829  * bridge_rtflush:
2830  *
2831  *	Remove all dynamic addresses from the bridge.
2832  */
2833 static void
2834 bridge_rtflush(struct bridge_softc *sc, int full)
2835 {
2836 	struct bridge_rtnode *brt, *nbrt;
2837 
2838 	BRIDGE_LOCK_ASSERT(sc);
2839 
2840 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2841 		if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2842 			bridge_rtnode_destroy(sc, brt);
2843 	}
2844 }
2845 
2846 /*
2847  * bridge_rtdaddr:
2848  *
2849  *	Remove an address from the table.
2850  */
2851 static int
2852 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2853 {
2854 	struct bridge_rtnode *brt;
2855 	int found = 0;
2856 
2857 	BRIDGE_LOCK_ASSERT(sc);
2858 
2859 	/*
2860 	 * If vlan is zero then we want to delete for all vlans so the lookup
2861 	 * may return more than one.
2862 	 */
2863 	while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2864 		bridge_rtnode_destroy(sc, brt);
2865 		found = 1;
2866 	}
2867 
2868 	return (found ? 0 : ENOENT);
2869 }
2870 
2871 /*
2872  * bridge_rtdelete:
2873  *
2874  *	Delete routes to a speicifc member interface.
2875  */
2876 static void
2877 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2878 {
2879 	struct bridge_rtnode *brt, *nbrt;
2880 
2881 	BRIDGE_LOCK_ASSERT(sc);
2882 
2883 	LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2884 		if (brt->brt_ifp == ifp && (full ||
2885 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2886 			bridge_rtnode_destroy(sc, brt);
2887 	}
2888 }
2889 
2890 /*
2891  * bridge_rtable_init:
2892  *
2893  *	Initialize the route table for this bridge.
2894  */
2895 static void
2896 bridge_rtable_init(struct bridge_softc *sc)
2897 {
2898 	int i;
2899 
2900 	sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2901 	    M_DEVBUF, M_WAITOK);
2902 
2903 	for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2904 		LIST_INIT(&sc->sc_rthash[i]);
2905 
2906 	sc->sc_rthash_key = arc4random();
2907 	LIST_INIT(&sc->sc_rtlist);
2908 }
2909 
2910 /*
2911  * bridge_rtable_fini:
2912  *
2913  *	Deconstruct the route table for this bridge.
2914  */
2915 static void
2916 bridge_rtable_fini(struct bridge_softc *sc)
2917 {
2918 
2919 	KASSERT(sc->sc_brtcnt == 0,
2920 	    ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2921 	free(sc->sc_rthash, M_DEVBUF);
2922 }
2923 
2924 /*
2925  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2926  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2927  */
2928 #define	mix(a, b, c)							\
2929 do {									\
2930 	a -= b; a -= c; a ^= (c >> 13);					\
2931 	b -= c; b -= a; b ^= (a << 8);					\
2932 	c -= a; c -= b; c ^= (b >> 13);					\
2933 	a -= b; a -= c; a ^= (c >> 12);					\
2934 	b -= c; b -= a; b ^= (a << 16);					\
2935 	c -= a; c -= b; c ^= (b >> 5);					\
2936 	a -= b; a -= c; a ^= (c >> 3);					\
2937 	b -= c; b -= a; b ^= (a << 10);					\
2938 	c -= a; c -= b; c ^= (b >> 15);					\
2939 } while (/*CONSTCOND*/0)
2940 
2941 static __inline uint32_t
2942 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2943 {
2944 	uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2945 
2946 	b += addr[5] << 8;
2947 	b += addr[4];
2948 	a += addr[3] << 24;
2949 	a += addr[2] << 16;
2950 	a += addr[1] << 8;
2951 	a += addr[0];
2952 
2953 	mix(a, b, c);
2954 
2955 	return (c & BRIDGE_RTHASH_MASK);
2956 }
2957 
2958 #undef mix
2959 
2960 static int
2961 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2962 {
2963 	int i, d;
2964 
2965 	for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2966 		d = ((int)a[i]) - ((int)b[i]);
2967 	}
2968 
2969 	return (d);
2970 }
2971 
2972 /*
2973  * bridge_rtnode_lookup:
2974  *
2975  *	Look up a bridge route node for the specified destination. Compare the
2976  *	vlan id or if zero then just return the first match.
2977  */
2978 static struct bridge_rtnode *
2979 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2980 {
2981 	struct bridge_rtnode *brt;
2982 	uint32_t hash;
2983 	int dir;
2984 
2985 	BRIDGE_LOCK_ASSERT(sc);
2986 
2987 	hash = bridge_rthash(sc, addr);
2988 	LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2989 		dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2990 		if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2991 			return (brt);
2992 		if (dir > 0)
2993 			return (NULL);
2994 	}
2995 
2996 	return (NULL);
2997 }
2998 
2999 /*
3000  * bridge_rtnode_insert:
3001  *
3002  *	Insert the specified bridge node into the route table.  We
3003  *	assume the entry is not already in the table.
3004  */
3005 static int
3006 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3007 {
3008 	struct bridge_rtnode *lbrt;
3009 	uint32_t hash;
3010 	int dir;
3011 
3012 	BRIDGE_LOCK_ASSERT(sc);
3013 
3014 	hash = bridge_rthash(sc, brt->brt_addr);
3015 
3016 	lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
3017 	if (lbrt == NULL) {
3018 		LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3019 		goto out;
3020 	}
3021 
3022 	do {
3023 		dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3024 		if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3025 			return (EEXIST);
3026 		if (dir > 0) {
3027 			LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3028 			goto out;
3029 		}
3030 		if (LIST_NEXT(lbrt, brt_hash) == NULL) {
3031 			LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3032 			goto out;
3033 		}
3034 		lbrt = LIST_NEXT(lbrt, brt_hash);
3035 	} while (lbrt != NULL);
3036 
3037 #ifdef DIAGNOSTIC
3038 	panic("bridge_rtnode_insert: impossible");
3039 #endif
3040 
3041 out:
3042 	LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3043 	sc->sc_brtcnt++;
3044 
3045 	return (0);
3046 }
3047 
3048 /*
3049  * bridge_rtnode_destroy:
3050  *
3051  *	Destroy a bridge rtnode.
3052  */
3053 static void
3054 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3055 {
3056 	BRIDGE_LOCK_ASSERT(sc);
3057 
3058 	LIST_REMOVE(brt, brt_hash);
3059 
3060 	LIST_REMOVE(brt, brt_list);
3061 	sc->sc_brtcnt--;
3062 	brt->brt_dst->bif_addrcnt--;
3063 	uma_zfree(V_bridge_rtnode_zone, brt);
3064 }
3065 
3066 /*
3067  * bridge_rtable_expire:
3068  *
3069  *	Set the expiry time for all routes on an interface.
3070  */
3071 static void
3072 bridge_rtable_expire(struct ifnet *ifp, int age)
3073 {
3074 	struct bridge_softc *sc = ifp->if_bridge;
3075 	struct bridge_rtnode *brt;
3076 
3077 	CURVNET_SET(ifp->if_vnet);
3078 	BRIDGE_LOCK(sc);
3079 
3080 	/*
3081 	 * If the age is zero then flush, otherwise set all the expiry times to
3082 	 * age for the interface
3083 	 */
3084 	if (age == 0)
3085 		bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3086 	else {
3087 		LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3088 			/* Cap the expiry time to 'age' */
3089 			if (brt->brt_ifp == ifp &&
3090 			    brt->brt_expire > time_uptime + age &&
3091 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3092 				brt->brt_expire = time_uptime + age;
3093 		}
3094 	}
3095 	BRIDGE_UNLOCK(sc);
3096 	CURVNET_RESTORE();
3097 }
3098 
3099 /*
3100  * bridge_state_change:
3101  *
3102  *	Callback from the bridgestp code when a port changes states.
3103  */
3104 static void
3105 bridge_state_change(struct ifnet *ifp, int state)
3106 {
3107 	struct bridge_softc *sc = ifp->if_bridge;
3108 	static const char *stpstates[] = {
3109 		"disabled",
3110 		"listening",
3111 		"learning",
3112 		"forwarding",
3113 		"blocking",
3114 		"discarding"
3115 	};
3116 
3117 	CURVNET_SET(ifp->if_vnet);
3118 	if (V_log_stp)
3119 		log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3120 		    sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3121 	CURVNET_RESTORE();
3122 }
3123 
3124 /*
3125  * Send bridge packets through pfil if they are one of the types pfil can deal
3126  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3127  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3128  * that interface.
3129  */
3130 static int
3131 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3132 {
3133 	int snap, error, i, hlen;
3134 	struct ether_header *eh1, eh2;
3135 	struct ip *ip;
3136 	struct llc llc1;
3137 	u_int16_t ether_type;
3138 	pfil_return_t rv;
3139 
3140 	snap = 0;
3141 	error = -1;	/* Default error if not error == 0 */
3142 
3143 #if 0
3144 	/* we may return with the IP fields swapped, ensure its not shared */
3145 	KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3146 #endif
3147 
3148 	if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3149 		return (0); /* filtering is disabled */
3150 
3151 	i = min((*mp)->m_pkthdr.len, max_protohdr);
3152 	if ((*mp)->m_len < i) {
3153 	    *mp = m_pullup(*mp, i);
3154 	    if (*mp == NULL) {
3155 		printf("%s: m_pullup failed\n", __func__);
3156 		return (-1);
3157 	    }
3158 	}
3159 
3160 	eh1 = mtod(*mp, struct ether_header *);
3161 	ether_type = ntohs(eh1->ether_type);
3162 
3163 	/*
3164 	 * Check for SNAP/LLC.
3165 	 */
3166 	if (ether_type < ETHERMTU) {
3167 		struct llc *llc2 = (struct llc *)(eh1 + 1);
3168 
3169 		if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3170 		    llc2->llc_dsap == LLC_SNAP_LSAP &&
3171 		    llc2->llc_ssap == LLC_SNAP_LSAP &&
3172 		    llc2->llc_control == LLC_UI) {
3173 			ether_type = htons(llc2->llc_un.type_snap.ether_type);
3174 			snap = 1;
3175 		}
3176 	}
3177 
3178 	/*
3179 	 * If we're trying to filter bridge traffic, don't look at anything
3180 	 * other than IP and ARP traffic.  If the filter doesn't understand
3181 	 * IPv6, don't allow IPv6 through the bridge either.  This is lame
3182 	 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3183 	 * but of course we don't have an AppleTalk filter to begin with.
3184 	 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3185 	 * ARP traffic.)
3186 	 */
3187 	switch (ether_type) {
3188 		case ETHERTYPE_ARP:
3189 		case ETHERTYPE_REVARP:
3190 			if (V_pfil_ipfw_arp == 0)
3191 				return (0); /* Automatically pass */
3192 			break;
3193 
3194 		case ETHERTYPE_IP:
3195 #ifdef INET6
3196 		case ETHERTYPE_IPV6:
3197 #endif /* INET6 */
3198 			break;
3199 		default:
3200 			/*
3201 			 * Check to see if the user wants to pass non-ip
3202 			 * packets, these will not be checked by pfil(9) and
3203 			 * passed unconditionally so the default is to drop.
3204 			 */
3205 			if (V_pfil_onlyip)
3206 				goto bad;
3207 	}
3208 
3209 	/* Run the packet through pfil before stripping link headers */
3210 	if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3211 	    dir == PFIL_OUT && ifp != NULL) {
3212 		switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3213 		case PFIL_DROPPED:
3214 			return (EACCES);
3215 		case PFIL_CONSUMED:
3216 			return (0);
3217 		}
3218 	}
3219 
3220 	/* Strip off the Ethernet header and keep a copy. */
3221 	m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3222 	m_adj(*mp, ETHER_HDR_LEN);
3223 
3224 	/* Strip off snap header, if present */
3225 	if (snap) {
3226 		m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3227 		m_adj(*mp, sizeof(struct llc));
3228 	}
3229 
3230 	/*
3231 	 * Check the IP header for alignment and errors
3232 	 */
3233 	if (dir == PFIL_IN) {
3234 		switch (ether_type) {
3235 			case ETHERTYPE_IP:
3236 				error = bridge_ip_checkbasic(mp);
3237 				break;
3238 #ifdef INET6
3239 			case ETHERTYPE_IPV6:
3240 				error = bridge_ip6_checkbasic(mp);
3241 				break;
3242 #endif /* INET6 */
3243 			default:
3244 				error = 0;
3245 		}
3246 		if (error)
3247 			goto bad;
3248 	}
3249 
3250 	error = 0;
3251 
3252 	/*
3253 	 * Run the packet through pfil
3254 	 */
3255 	rv = PFIL_PASS;
3256 	switch (ether_type) {
3257 	case ETHERTYPE_IP:
3258 		/*
3259 		 * Run pfil on the member interface and the bridge, both can
3260 		 * be skipped by clearing pfil_member or pfil_bridge.
3261 		 *
3262 		 * Keep the order:
3263 		 *   in_if -> bridge_if -> out_if
3264 		 */
3265 		if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3266 		    pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3267 		    PFIL_PASS)
3268 			break;
3269 
3270 		if (V_pfil_member && ifp != NULL && (rv =
3271 		    pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3272 		    PFIL_PASS)
3273 			break;
3274 
3275 		if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3276 		    pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3277 		    PFIL_PASS)
3278 			break;
3279 
3280 		/* check if we need to fragment the packet */
3281 		/* bridge_fragment generates a mbuf chain of packets */
3282 		/* that already include eth headers */
3283 		if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3284 			i = (*mp)->m_pkthdr.len;
3285 			if (i > ifp->if_mtu) {
3286 				error = bridge_fragment(ifp, mp, &eh2, snap,
3287 					    &llc1);
3288 				return (error);
3289 			}
3290 		}
3291 
3292 		/* Recalculate the ip checksum. */
3293 		ip = mtod(*mp, struct ip *);
3294 		hlen = ip->ip_hl << 2;
3295 		if (hlen < sizeof(struct ip))
3296 			goto bad;
3297 		if (hlen > (*mp)->m_len) {
3298 			if ((*mp = m_pullup(*mp, hlen)) == NULL)
3299 				goto bad;
3300 			ip = mtod(*mp, struct ip *);
3301 			if (ip == NULL)
3302 				goto bad;
3303 		}
3304 		ip->ip_sum = 0;
3305 		if (hlen == sizeof(struct ip))
3306 			ip->ip_sum = in_cksum_hdr(ip);
3307 		else
3308 			ip->ip_sum = in_cksum(*mp, hlen);
3309 
3310 		break;
3311 #ifdef INET6
3312 	case ETHERTYPE_IPV6:
3313 		if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3314 		    pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3315 		    PFIL_PASS)
3316 			break;
3317 
3318 		if (V_pfil_member && ifp != NULL && (rv =
3319 		    pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3320 		    PFIL_PASS)
3321 			break;
3322 
3323 		if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3324 		    pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3325 		    PFIL_PASS)
3326 			break;
3327 		break;
3328 #endif
3329 	}
3330 
3331 	switch (rv) {
3332 	case PFIL_CONSUMED:
3333 		return (0);
3334 	case PFIL_DROPPED:
3335 		return (EACCES);
3336 	default:
3337 		break;
3338 	}
3339 
3340 	error = -1;
3341 
3342 	/*
3343 	 * Finally, put everything back the way it was and return
3344 	 */
3345 	if (snap) {
3346 		M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3347 		if (*mp == NULL)
3348 			return (error);
3349 		bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3350 	}
3351 
3352 	M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3353 	if (*mp == NULL)
3354 		return (error);
3355 	bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3356 
3357 	return (0);
3358 
3359 bad:
3360 	m_freem(*mp);
3361 	*mp = NULL;
3362 	return (error);
3363 }
3364 
3365 /*
3366  * Perform basic checks on header size since
3367  * pfil assumes ip_input has already processed
3368  * it for it.  Cut-and-pasted from ip_input.c.
3369  * Given how simple the IPv6 version is,
3370  * does the IPv4 version really need to be
3371  * this complicated?
3372  *
3373  * XXX Should we update ipstat here, or not?
3374  * XXX Right now we update ipstat but not
3375  * XXX csum_counter.
3376  */
3377 static int
3378 bridge_ip_checkbasic(struct mbuf **mp)
3379 {
3380 	struct mbuf *m = *mp;
3381 	struct ip *ip;
3382 	int len, hlen;
3383 	u_short sum;
3384 
3385 	if (*mp == NULL)
3386 		return (-1);
3387 
3388 	if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3389 		if ((m = m_copyup(m, sizeof(struct ip),
3390 			(max_linkhdr + 3) & ~3)) == NULL) {
3391 			/* XXXJRT new stat, please */
3392 			KMOD_IPSTAT_INC(ips_toosmall);
3393 			goto bad;
3394 		}
3395 	} else if (__predict_false(m->m_len < sizeof (struct ip))) {
3396 		if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3397 			KMOD_IPSTAT_INC(ips_toosmall);
3398 			goto bad;
3399 		}
3400 	}
3401 	ip = mtod(m, struct ip *);
3402 	if (ip == NULL) goto bad;
3403 
3404 	if (ip->ip_v != IPVERSION) {
3405 		KMOD_IPSTAT_INC(ips_badvers);
3406 		goto bad;
3407 	}
3408 	hlen = ip->ip_hl << 2;
3409 	if (hlen < sizeof(struct ip)) { /* minimum header length */
3410 		KMOD_IPSTAT_INC(ips_badhlen);
3411 		goto bad;
3412 	}
3413 	if (hlen > m->m_len) {
3414 		if ((m = m_pullup(m, hlen)) == NULL) {
3415 			KMOD_IPSTAT_INC(ips_badhlen);
3416 			goto bad;
3417 		}
3418 		ip = mtod(m, struct ip *);
3419 		if (ip == NULL) goto bad;
3420 	}
3421 
3422 	if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3423 		sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3424 	} else {
3425 		if (hlen == sizeof(struct ip)) {
3426 			sum = in_cksum_hdr(ip);
3427 		} else {
3428 			sum = in_cksum(m, hlen);
3429 		}
3430 	}
3431 	if (sum) {
3432 		KMOD_IPSTAT_INC(ips_badsum);
3433 		goto bad;
3434 	}
3435 
3436 	/* Retrieve the packet length. */
3437 	len = ntohs(ip->ip_len);
3438 
3439 	/*
3440 	 * Check for additional length bogosity
3441 	 */
3442 	if (len < hlen) {
3443 		KMOD_IPSTAT_INC(ips_badlen);
3444 		goto bad;
3445 	}
3446 
3447 	/*
3448 	 * Check that the amount of data in the buffers
3449 	 * is as at least much as the IP header would have us expect.
3450 	 * Drop packet if shorter than we expect.
3451 	 */
3452 	if (m->m_pkthdr.len < len) {
3453 		KMOD_IPSTAT_INC(ips_tooshort);
3454 		goto bad;
3455 	}
3456 
3457 	/* Checks out, proceed */
3458 	*mp = m;
3459 	return (0);
3460 
3461 bad:
3462 	*mp = m;
3463 	return (-1);
3464 }
3465 
3466 #ifdef INET6
3467 /*
3468  * Same as above, but for IPv6.
3469  * Cut-and-pasted from ip6_input.c.
3470  * XXX Should we update ip6stat, or not?
3471  */
3472 static int
3473 bridge_ip6_checkbasic(struct mbuf **mp)
3474 {
3475 	struct mbuf *m = *mp;
3476 	struct ip6_hdr *ip6;
3477 
3478 	/*
3479 	 * If the IPv6 header is not aligned, slurp it up into a new
3480 	 * mbuf with space for link headers, in the event we forward
3481 	 * it.  Otherwise, if it is aligned, make sure the entire base
3482 	 * IPv6 header is in the first mbuf of the chain.
3483 	 */
3484 	if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3485 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3486 		if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3487 			    (max_linkhdr + 3) & ~3)) == NULL) {
3488 			/* XXXJRT new stat, please */
3489 			IP6STAT_INC(ip6s_toosmall);
3490 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3491 			goto bad;
3492 		}
3493 	} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3494 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3495 		if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3496 			IP6STAT_INC(ip6s_toosmall);
3497 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3498 			goto bad;
3499 		}
3500 	}
3501 
3502 	ip6 = mtod(m, struct ip6_hdr *);
3503 
3504 	if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3505 		IP6STAT_INC(ip6s_badvers);
3506 		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3507 		goto bad;
3508 	}
3509 
3510 	/* Checks out, proceed */
3511 	*mp = m;
3512 	return (0);
3513 
3514 bad:
3515 	*mp = m;
3516 	return (-1);
3517 }
3518 #endif /* INET6 */
3519 
3520 /*
3521  * bridge_fragment:
3522  *
3523  *	Fragment mbuf chain in multiple packets and prepend ethernet header.
3524  */
3525 static int
3526 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3527     int snap, struct llc *llc)
3528 {
3529 	struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3530 	struct ip *ip;
3531 	int error = -1;
3532 
3533 	if (m->m_len < sizeof(struct ip) &&
3534 	    (m = m_pullup(m, sizeof(struct ip))) == NULL)
3535 		goto dropit;
3536 	ip = mtod(m, struct ip *);
3537 
3538 	m->m_pkthdr.csum_flags |= CSUM_IP;
3539 	error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3540 	if (error)
3541 		goto dropit;
3542 
3543 	/*
3544 	 * Walk the chain and re-add the Ethernet header for
3545 	 * each mbuf packet.
3546 	 */
3547 	for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3548 		nextpkt = mcur->m_nextpkt;
3549 		mcur->m_nextpkt = NULL;
3550 		if (snap) {
3551 			M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3552 			if (mcur == NULL) {
3553 				error = ENOBUFS;
3554 				if (mprev != NULL)
3555 					mprev->m_nextpkt = nextpkt;
3556 				goto dropit;
3557 			}
3558 			bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3559 		}
3560 
3561 		M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3562 		if (mcur == NULL) {
3563 			error = ENOBUFS;
3564 			if (mprev != NULL)
3565 				mprev->m_nextpkt = nextpkt;
3566 			goto dropit;
3567 		}
3568 		bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3569 
3570 		/*
3571 		 * The previous two M_PREPEND could have inserted one or two
3572 		 * mbufs in front so we have to update the previous packet's
3573 		 * m_nextpkt.
3574 		 */
3575 		mcur->m_nextpkt = nextpkt;
3576 		if (mprev != NULL)
3577 			mprev->m_nextpkt = mcur;
3578 		else {
3579 			/* The first mbuf in the original chain needs to be
3580 			 * updated. */
3581 			*mp = mcur;
3582 		}
3583 		mprev = mcur;
3584 	}
3585 
3586 	KMOD_IPSTAT_INC(ips_fragmented);
3587 	return (error);
3588 
3589 dropit:
3590 	for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3591 		m = mcur->m_nextpkt;
3592 		m_freem(mcur);
3593 	}
3594 	return (error);
3595 }
3596 
3597 static void
3598 bridge_linkstate(struct ifnet *ifp)
3599 {
3600 	struct bridge_softc *sc = ifp->if_bridge;
3601 	struct bridge_iflist *bif;
3602 
3603 	BRIDGE_LOCK(sc);
3604 	bif = bridge_lookup_member_if(sc, ifp);
3605 	if (bif == NULL) {
3606 		BRIDGE_UNLOCK(sc);
3607 		return;
3608 	}
3609 	bridge_linkcheck(sc);
3610 	BRIDGE_UNLOCK(sc);
3611 
3612 	bstp_linkstate(&bif->bif_stp);
3613 }
3614 
3615 static void
3616 bridge_linkcheck(struct bridge_softc *sc)
3617 {
3618 	struct bridge_iflist *bif;
3619 	int new_link, hasls;
3620 
3621 	BRIDGE_LOCK_ASSERT(sc);
3622 	new_link = LINK_STATE_DOWN;
3623 	hasls = 0;
3624 	/* Our link is considered up if at least one of our ports is active */
3625 	LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3626 		if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3627 			hasls++;
3628 		if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3629 			new_link = LINK_STATE_UP;
3630 			break;
3631 		}
3632 	}
3633 	if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3634 		/* If no interfaces support link-state then we default to up */
3635 		new_link = LINK_STATE_UP;
3636 	}
3637 	if_link_state_change(sc->sc_ifp, new_link);
3638 }
3639