xref: /freebsd/sys/net/if_bridge.c (revision 3e8eb5c7f4909209c042403ddee340b2ee7003a5)
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 locking
189  *
190  * The bridge relies heavily on the epoch(9) system to protect its data
191  * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we
192  * must ensure there is only one writer at a time.
193  *
194  * That is: for read accesses we only need to be in NET_EPOCH, but for write
195  * accesses we must hold:
196  *
197  *  - BRIDGE_RT_LOCK, for any change to bridge_rtnodes
198  *  - BRIDGE_LOCK, for any other change
199  *
200  * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl()
201  * calls to bridge member interfaces and these ioctl()s can sleep.
202  * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes
203  * required while we're in NET_EPOCH and then we're not allowed to sleep.
204  */
205 #define BRIDGE_LOCK_INIT(_sc)		do {			\
206 	sx_init(&(_sc)->sc_sx, "if_bridge");			\
207 	mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF);	\
208 } while (0)
209 #define BRIDGE_LOCK_DESTROY(_sc)	do {	\
210 	sx_destroy(&(_sc)->sc_sx);		\
211 	mtx_destroy(&(_sc)->sc_rt_mtx);		\
212 } while (0)
213 #define BRIDGE_LOCK(_sc)		sx_xlock(&(_sc)->sc_sx)
214 #define BRIDGE_UNLOCK(_sc)		sx_xunlock(&(_sc)->sc_sx)
215 #define BRIDGE_LOCK_ASSERT(_sc)		sx_assert(&(_sc)->sc_sx, SX_XLOCKED)
216 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc)	\
217 	    MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx))
218 #define BRIDGE_UNLOCK_ASSERT(_sc)	sx_assert(&(_sc)->sc_sx, SX_UNLOCKED)
219 #define BRIDGE_RT_LOCK(_sc)		mtx_lock(&(_sc)->sc_rt_mtx)
220 #define BRIDGE_RT_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_rt_mtx)
221 #define BRIDGE_RT_LOCK_ASSERT(_sc)	mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED)
222 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc)	\
223 	    MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx))
224 
225 /*
226  * Bridge interface list entry.
227  */
228 struct bridge_iflist {
229 	CK_LIST_ENTRY(bridge_iflist) bif_next;
230 	struct ifnet		*bif_ifp;	/* member if */
231 	struct bstp_port	bif_stp;	/* STP state */
232 	uint32_t		bif_flags;	/* member if flags */
233 	int			bif_savedcaps;	/* saved capabilities */
234 	uint32_t		bif_addrmax;	/* max # of addresses */
235 	uint32_t		bif_addrcnt;	/* cur. # of addresses */
236 	uint32_t		bif_addrexceeded;/* # of address violations */
237 	struct epoch_context	bif_epoch_ctx;
238 };
239 
240 /*
241  * Bridge route node.
242  */
243 struct bridge_rtnode {
244 	CK_LIST_ENTRY(bridge_rtnode) brt_hash;	/* hash table linkage */
245 	CK_LIST_ENTRY(bridge_rtnode) brt_list;	/* list linkage */
246 	struct bridge_iflist	*brt_dst;	/* destination if */
247 	unsigned long		brt_expire;	/* expiration time */
248 	uint8_t			brt_flags;	/* address flags */
249 	uint8_t			brt_addr[ETHER_ADDR_LEN];
250 	uint16_t		brt_vlan;	/* vlan id */
251 	struct	vnet		*brt_vnet;
252 	struct	epoch_context	brt_epoch_ctx;
253 };
254 #define	brt_ifp			brt_dst->bif_ifp
255 
256 /*
257  * Software state for each bridge.
258  */
259 struct bridge_softc {
260 	struct ifnet		*sc_ifp;	/* make this an interface */
261 	LIST_ENTRY(bridge_softc) sc_list;
262 	struct sx		sc_sx;
263 	struct mtx		sc_rt_mtx;
264 	uint32_t		sc_brtmax;	/* max # of addresses */
265 	uint32_t		sc_brtcnt;	/* cur. # of addresses */
266 	uint32_t		sc_brttimeout;	/* rt timeout in seconds */
267 	struct callout		sc_brcallout;	/* bridge callout */
268 	CK_LIST_HEAD(, bridge_iflist) sc_iflist;	/* member interface list */
269 	CK_LIST_HEAD(, bridge_rtnode) *sc_rthash;	/* our forwarding table */
270 	CK_LIST_HEAD(, bridge_rtnode) sc_rtlist;	/* list version of above */
271 	uint32_t		sc_rthash_key;	/* key for hash */
272 	CK_LIST_HEAD(, bridge_iflist) sc_spanlist;	/* span ports list */
273 	struct bstp_state	sc_stp;		/* STP state */
274 	uint32_t		sc_brtexceeded;	/* # of cache drops */
275 	struct ifnet		*sc_ifaddr;	/* member mac copied from */
276 	struct ether_addr	sc_defaddr;	/* Default MAC address */
277 	struct epoch_context	sc_epoch_ctx;
278 };
279 
280 VNET_DEFINE_STATIC(struct sx, bridge_list_sx);
281 #define	V_bridge_list_sx	VNET(bridge_list_sx)
282 static eventhandler_tag bridge_detach_cookie;
283 
284 int	bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
285 
286 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
287 #define	V_bridge_rtnode_zone	VNET(bridge_rtnode_zone)
288 
289 static int	bridge_clone_create(struct if_clone *, int, caddr_t);
290 static void	bridge_clone_destroy(struct ifnet *);
291 
292 static int	bridge_ioctl(struct ifnet *, u_long, caddr_t);
293 static void	bridge_mutecaps(struct bridge_softc *);
294 static void	bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
295 		    int);
296 static void	bridge_ifdetach(void *arg __unused, struct ifnet *);
297 static void	bridge_init(void *);
298 static void	bridge_dummynet(struct mbuf *, struct ifnet *);
299 static void	bridge_stop(struct ifnet *, int);
300 static int	bridge_transmit(struct ifnet *, struct mbuf *);
301 #ifdef ALTQ
302 static void	bridge_altq_start(if_t);
303 static int	bridge_altq_transmit(if_t, struct mbuf *);
304 #endif
305 static void	bridge_qflush(struct ifnet *);
306 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
307 static int	bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
308 		    struct rtentry *);
309 static int	bridge_enqueue(struct bridge_softc *, struct ifnet *,
310 		    struct mbuf *);
311 static void	bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
312 
313 static void	bridge_forward(struct bridge_softc *, struct bridge_iflist *,
314 		    struct mbuf *m);
315 
316 static void	bridge_timer(void *);
317 
318 static void	bridge_broadcast(struct bridge_softc *, struct ifnet *,
319 		    struct mbuf *, int);
320 static void	bridge_span(struct bridge_softc *, struct mbuf *);
321 
322 static int	bridge_rtupdate(struct bridge_softc *, const uint8_t *,
323 		    uint16_t, struct bridge_iflist *, int, uint8_t);
324 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
325 		    uint16_t);
326 static void	bridge_rttrim(struct bridge_softc *);
327 static void	bridge_rtage(struct bridge_softc *);
328 static void	bridge_rtflush(struct bridge_softc *, int);
329 static int	bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
330 		    uint16_t);
331 
332 static void	bridge_rtable_init(struct bridge_softc *);
333 static void	bridge_rtable_fini(struct bridge_softc *);
334 
335 static int	bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
336 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
337 		    const uint8_t *, uint16_t);
338 static int	bridge_rtnode_insert(struct bridge_softc *,
339 		    struct bridge_rtnode *);
340 static void	bridge_rtnode_destroy(struct bridge_softc *,
341 		    struct bridge_rtnode *);
342 static void	bridge_rtable_expire(struct ifnet *, int);
343 static void	bridge_state_change(struct ifnet *, int);
344 
345 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
346 		    const char *name);
347 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
348 		    struct ifnet *ifp);
349 static void	bridge_delete_member(struct bridge_softc *,
350 		    struct bridge_iflist *, int);
351 static void	bridge_delete_span(struct bridge_softc *,
352 		    struct bridge_iflist *);
353 
354 static int	bridge_ioctl_add(struct bridge_softc *, void *);
355 static int	bridge_ioctl_del(struct bridge_softc *, void *);
356 static int	bridge_ioctl_gifflags(struct bridge_softc *, void *);
357 static int	bridge_ioctl_sifflags(struct bridge_softc *, void *);
358 static int	bridge_ioctl_scache(struct bridge_softc *, void *);
359 static int	bridge_ioctl_gcache(struct bridge_softc *, void *);
360 static int	bridge_ioctl_gifs(struct bridge_softc *, void *);
361 static int	bridge_ioctl_rts(struct bridge_softc *, void *);
362 static int	bridge_ioctl_saddr(struct bridge_softc *, void *);
363 static int	bridge_ioctl_sto(struct bridge_softc *, void *);
364 static int	bridge_ioctl_gto(struct bridge_softc *, void *);
365 static int	bridge_ioctl_daddr(struct bridge_softc *, void *);
366 static int	bridge_ioctl_flush(struct bridge_softc *, void *);
367 static int	bridge_ioctl_gpri(struct bridge_softc *, void *);
368 static int	bridge_ioctl_spri(struct bridge_softc *, void *);
369 static int	bridge_ioctl_ght(struct bridge_softc *, void *);
370 static int	bridge_ioctl_sht(struct bridge_softc *, void *);
371 static int	bridge_ioctl_gfd(struct bridge_softc *, void *);
372 static int	bridge_ioctl_sfd(struct bridge_softc *, void *);
373 static int	bridge_ioctl_gma(struct bridge_softc *, void *);
374 static int	bridge_ioctl_sma(struct bridge_softc *, void *);
375 static int	bridge_ioctl_sifprio(struct bridge_softc *, void *);
376 static int	bridge_ioctl_sifcost(struct bridge_softc *, void *);
377 static int	bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
378 static int	bridge_ioctl_addspan(struct bridge_softc *, void *);
379 static int	bridge_ioctl_delspan(struct bridge_softc *, void *);
380 static int	bridge_ioctl_gbparam(struct bridge_softc *, void *);
381 static int	bridge_ioctl_grte(struct bridge_softc *, void *);
382 static int	bridge_ioctl_gifsstp(struct bridge_softc *, void *);
383 static int	bridge_ioctl_sproto(struct bridge_softc *, void *);
384 static int	bridge_ioctl_stxhc(struct bridge_softc *, void *);
385 static int	bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
386 		    int);
387 static int	bridge_ip_checkbasic(struct mbuf **mp);
388 #ifdef INET6
389 static int	bridge_ip6_checkbasic(struct mbuf **mp);
390 #endif /* INET6 */
391 static int	bridge_fragment(struct ifnet *, struct mbuf **mp,
392 		    struct ether_header *, int, struct llc *);
393 static void	bridge_linkstate(struct ifnet *ifp);
394 static void	bridge_linkcheck(struct bridge_softc *sc);
395 
396 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
397 #define	VLANTAGOF(_m)	\
398     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
399 
400 static struct bstp_cb_ops bridge_ops = {
401 	.bcb_state = bridge_state_change,
402 	.bcb_rtage = bridge_rtable_expire
403 };
404 
405 SYSCTL_DECL(_net_link);
406 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
407     "Bridge");
408 
409 /* only pass IP[46] packets when pfil is enabled */
410 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
411 #define	V_pfil_onlyip	VNET(pfil_onlyip)
412 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
413     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
414     "Only pass IP packets when pfil is enabled");
415 
416 /* run pfil hooks on the bridge interface */
417 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
418 #define	V_pfil_bridge	VNET(pfil_bridge)
419 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
420     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
421     "Packet filter on the bridge interface");
422 
423 /* layer2 filter with ipfw */
424 VNET_DEFINE_STATIC(int, pfil_ipfw);
425 #define	V_pfil_ipfw	VNET(pfil_ipfw)
426 
427 /* layer2 ARP filter with ipfw */
428 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
429 #define	V_pfil_ipfw_arp	VNET(pfil_ipfw_arp)
430 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
431     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
432     "Filter ARP packets through IPFW layer2");
433 
434 /* run pfil hooks on the member interface */
435 VNET_DEFINE_STATIC(int, pfil_member) = 1;
436 #define	V_pfil_member	VNET(pfil_member)
437 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
438     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
439     "Packet filter on the member interface");
440 
441 /* run pfil hooks on the physical interface for locally destined packets */
442 VNET_DEFINE_STATIC(int, pfil_local_phys);
443 #define	V_pfil_local_phys	VNET(pfil_local_phys)
444 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
445     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
446     "Packet filter on the physical interface for locally destined packets");
447 
448 /* log STP state changes */
449 VNET_DEFINE_STATIC(int, log_stp);
450 #define	V_log_stp	VNET(log_stp)
451 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
452     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
453     "Log STP state changes");
454 
455 /* share MAC with first bridge member */
456 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
457 #define	V_bridge_inherit_mac	VNET(bridge_inherit_mac)
458 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
459     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
460     "Inherit MAC address from the first bridge member");
461 
462 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
463 #define	V_allow_llz_overlap	VNET(allow_llz_overlap)
464 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
465     CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
466     "Allow overlap of link-local scope "
467     "zones of a bridge interface and the member interfaces");
468 
469 struct bridge_control {
470 	int	(*bc_func)(struct bridge_softc *, void *);
471 	int	bc_argsize;
472 	int	bc_flags;
473 };
474 
475 #define	BC_F_COPYIN		0x01	/* copy arguments in */
476 #define	BC_F_COPYOUT		0x02	/* copy arguments out */
477 #define	BC_F_SUSER		0x04	/* do super-user check */
478 
479 const struct bridge_control bridge_control_table[] = {
480 	{ bridge_ioctl_add,		sizeof(struct ifbreq),
481 	  BC_F_COPYIN|BC_F_SUSER },
482 	{ bridge_ioctl_del,		sizeof(struct ifbreq),
483 	  BC_F_COPYIN|BC_F_SUSER },
484 
485 	{ bridge_ioctl_gifflags,	sizeof(struct ifbreq),
486 	  BC_F_COPYIN|BC_F_COPYOUT },
487 	{ bridge_ioctl_sifflags,	sizeof(struct ifbreq),
488 	  BC_F_COPYIN|BC_F_SUSER },
489 
490 	{ bridge_ioctl_scache,		sizeof(struct ifbrparam),
491 	  BC_F_COPYIN|BC_F_SUSER },
492 	{ bridge_ioctl_gcache,		sizeof(struct ifbrparam),
493 	  BC_F_COPYOUT },
494 
495 	{ bridge_ioctl_gifs,		sizeof(struct ifbifconf),
496 	  BC_F_COPYIN|BC_F_COPYOUT },
497 	{ bridge_ioctl_rts,		sizeof(struct ifbaconf),
498 	  BC_F_COPYIN|BC_F_COPYOUT },
499 
500 	{ bridge_ioctl_saddr,		sizeof(struct ifbareq),
501 	  BC_F_COPYIN|BC_F_SUSER },
502 
503 	{ bridge_ioctl_sto,		sizeof(struct ifbrparam),
504 	  BC_F_COPYIN|BC_F_SUSER },
505 	{ bridge_ioctl_gto,		sizeof(struct ifbrparam),
506 	  BC_F_COPYOUT },
507 
508 	{ bridge_ioctl_daddr,		sizeof(struct ifbareq),
509 	  BC_F_COPYIN|BC_F_SUSER },
510 
511 	{ bridge_ioctl_flush,		sizeof(struct ifbreq),
512 	  BC_F_COPYIN|BC_F_SUSER },
513 
514 	{ bridge_ioctl_gpri,		sizeof(struct ifbrparam),
515 	  BC_F_COPYOUT },
516 	{ bridge_ioctl_spri,		sizeof(struct ifbrparam),
517 	  BC_F_COPYIN|BC_F_SUSER },
518 
519 	{ bridge_ioctl_ght,		sizeof(struct ifbrparam),
520 	  BC_F_COPYOUT },
521 	{ bridge_ioctl_sht,		sizeof(struct ifbrparam),
522 	  BC_F_COPYIN|BC_F_SUSER },
523 
524 	{ bridge_ioctl_gfd,		sizeof(struct ifbrparam),
525 	  BC_F_COPYOUT },
526 	{ bridge_ioctl_sfd,		sizeof(struct ifbrparam),
527 	  BC_F_COPYIN|BC_F_SUSER },
528 
529 	{ bridge_ioctl_gma,		sizeof(struct ifbrparam),
530 	  BC_F_COPYOUT },
531 	{ bridge_ioctl_sma,		sizeof(struct ifbrparam),
532 	  BC_F_COPYIN|BC_F_SUSER },
533 
534 	{ bridge_ioctl_sifprio,		sizeof(struct ifbreq),
535 	  BC_F_COPYIN|BC_F_SUSER },
536 
537 	{ bridge_ioctl_sifcost,		sizeof(struct ifbreq),
538 	  BC_F_COPYIN|BC_F_SUSER },
539 
540 	{ bridge_ioctl_addspan,		sizeof(struct ifbreq),
541 	  BC_F_COPYIN|BC_F_SUSER },
542 	{ bridge_ioctl_delspan,		sizeof(struct ifbreq),
543 	  BC_F_COPYIN|BC_F_SUSER },
544 
545 	{ bridge_ioctl_gbparam,		sizeof(struct ifbropreq),
546 	  BC_F_COPYOUT },
547 
548 	{ bridge_ioctl_grte,		sizeof(struct ifbrparam),
549 	  BC_F_COPYOUT },
550 
551 	{ bridge_ioctl_gifsstp,		sizeof(struct ifbpstpconf),
552 	  BC_F_COPYIN|BC_F_COPYOUT },
553 
554 	{ bridge_ioctl_sproto,		sizeof(struct ifbrparam),
555 	  BC_F_COPYIN|BC_F_SUSER },
556 
557 	{ bridge_ioctl_stxhc,		sizeof(struct ifbrparam),
558 	  BC_F_COPYIN|BC_F_SUSER },
559 
560 	{ bridge_ioctl_sifmaxaddr,	sizeof(struct ifbreq),
561 	  BC_F_COPYIN|BC_F_SUSER },
562 
563 };
564 const int bridge_control_table_size = nitems(bridge_control_table);
565 
566 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
567 #define	V_bridge_list	VNET(bridge_list)
568 #define	BRIDGE_LIST_LOCK_INIT(x)	sx_init(&V_bridge_list_sx,	\
569 					    "if_bridge list")
570 #define	BRIDGE_LIST_LOCK_DESTROY(x)	sx_destroy(&V_bridge_list_sx)
571 #define	BRIDGE_LIST_LOCK(x)		sx_xlock(&V_bridge_list_sx)
572 #define	BRIDGE_LIST_UNLOCK(x)		sx_xunlock(&V_bridge_list_sx)
573 
574 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
575 #define	V_bridge_cloner	VNET(bridge_cloner)
576 
577 static const char bridge_name[] = "bridge";
578 
579 static void
580 vnet_bridge_init(const void *unused __unused)
581 {
582 
583 	V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
584 	    sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
585 	    UMA_ALIGN_PTR, 0);
586 	BRIDGE_LIST_LOCK_INIT();
587 	LIST_INIT(&V_bridge_list);
588 	V_bridge_cloner = if_clone_simple(bridge_name,
589 	    bridge_clone_create, bridge_clone_destroy, 0);
590 }
591 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
592     vnet_bridge_init, NULL);
593 
594 static void
595 vnet_bridge_uninit(const void *unused __unused)
596 {
597 
598 	if_clone_detach(V_bridge_cloner);
599 	V_bridge_cloner = NULL;
600 	BRIDGE_LIST_LOCK_DESTROY();
601 
602 	/* Callbacks may use the UMA zone. */
603 	epoch_drain_callbacks(net_epoch_preempt);
604 
605 	uma_zdestroy(V_bridge_rtnode_zone);
606 }
607 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
608     vnet_bridge_uninit, NULL);
609 
610 static int
611 bridge_modevent(module_t mod, int type, void *data)
612 {
613 
614 	switch (type) {
615 	case MOD_LOAD:
616 		bridge_dn_p = bridge_dummynet;
617 		bridge_detach_cookie = EVENTHANDLER_REGISTER(
618 		    ifnet_departure_event, bridge_ifdetach, NULL,
619 		    EVENTHANDLER_PRI_ANY);
620 		break;
621 	case MOD_UNLOAD:
622 		EVENTHANDLER_DEREGISTER(ifnet_departure_event,
623 		    bridge_detach_cookie);
624 		bridge_dn_p = NULL;
625 		break;
626 	default:
627 		return (EOPNOTSUPP);
628 	}
629 	return (0);
630 }
631 
632 static moduledata_t bridge_mod = {
633 	"if_bridge",
634 	bridge_modevent,
635 	0
636 };
637 
638 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
639 MODULE_VERSION(if_bridge, 1);
640 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
641 
642 /*
643  * handler for net.link.bridge.ipfw
644  */
645 static int
646 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
647 {
648 	int enable = V_pfil_ipfw;
649 	int error;
650 
651 	error = sysctl_handle_int(oidp, &enable, 0, req);
652 	enable &= 1;
653 
654 	if (enable != V_pfil_ipfw) {
655 		V_pfil_ipfw = enable;
656 
657 		/*
658 		 * Disable pfil so that ipfw doesnt run twice, if the user
659 		 * really wants both then they can re-enable pfil_bridge and/or
660 		 * pfil_member. Also allow non-ip packets as ipfw can filter by
661 		 * layer2 type.
662 		 */
663 		if (V_pfil_ipfw) {
664 			V_pfil_onlyip = 0;
665 			V_pfil_bridge = 0;
666 			V_pfil_member = 0;
667 		}
668 	}
669 
670 	return (error);
671 }
672 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
673     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
674     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
675     "Layer2 filter with IPFW");
676 
677 #ifdef VIMAGE
678 static void
679 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg)
680 {
681 	struct bridge_softc *sc = ifp->if_softc;
682 	struct bridge_iflist *bif;
683 
684 	BRIDGE_LOCK(sc);
685 
686 	while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
687 		bridge_delete_member(sc, bif, 0);
688 
689 	while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
690 		bridge_delete_span(sc, bif);
691 	}
692 
693 	BRIDGE_UNLOCK(sc);
694 
695 	ether_reassign(ifp, newvnet, arg);
696 }
697 #endif
698 
699 /*
700  * bridge_clone_create:
701  *
702  *	Create a new bridge instance.
703  */
704 static int
705 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
706 {
707 	struct bridge_softc *sc;
708 	struct ifnet *ifp;
709 
710 	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
711 	ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
712 	if (ifp == NULL) {
713 		free(sc, M_DEVBUF);
714 		return (ENOSPC);
715 	}
716 
717 	BRIDGE_LOCK_INIT(sc);
718 	sc->sc_brtmax = BRIDGE_RTABLE_MAX;
719 	sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
720 
721 	/* Initialize our routing table. */
722 	bridge_rtable_init(sc);
723 
724 	callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0);
725 
726 	CK_LIST_INIT(&sc->sc_iflist);
727 	CK_LIST_INIT(&sc->sc_spanlist);
728 
729 	ifp->if_softc = sc;
730 	if_initname(ifp, bridge_name, unit);
731 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
732 	ifp->if_ioctl = bridge_ioctl;
733 #ifdef ALTQ
734 	ifp->if_start = bridge_altq_start;
735 	ifp->if_transmit = bridge_altq_transmit;
736 	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
737 	ifp->if_snd.ifq_drv_maxlen = 0;
738 	IFQ_SET_READY(&ifp->if_snd);
739 #else
740 	ifp->if_transmit = bridge_transmit;
741 #endif
742 	ifp->if_qflush = bridge_qflush;
743 	ifp->if_init = bridge_init;
744 	ifp->if_type = IFT_BRIDGE;
745 
746 	ether_gen_addr(ifp, &sc->sc_defaddr);
747 
748 	bstp_attach(&sc->sc_stp, &bridge_ops);
749 	ether_ifattach(ifp, sc->sc_defaddr.octet);
750 	/* Now undo some of the damage... */
751 	ifp->if_baudrate = 0;
752 	ifp->if_type = IFT_BRIDGE;
753 #ifdef VIMAGE
754 	ifp->if_reassign = bridge_reassign;
755 #endif
756 
757 	BRIDGE_LIST_LOCK();
758 	LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
759 	BRIDGE_LIST_UNLOCK();
760 
761 	return (0);
762 }
763 
764 static void
765 bridge_clone_destroy_cb(struct epoch_context *ctx)
766 {
767 	struct bridge_softc *sc;
768 
769 	sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx);
770 
771 	BRIDGE_LOCK_DESTROY(sc);
772 	free(sc, M_DEVBUF);
773 }
774 
775 /*
776  * bridge_clone_destroy:
777  *
778  *	Destroy a bridge instance.
779  */
780 static void
781 bridge_clone_destroy(struct ifnet *ifp)
782 {
783 	struct bridge_softc *sc = ifp->if_softc;
784 	struct bridge_iflist *bif;
785 	struct epoch_tracker et;
786 
787 	BRIDGE_LOCK(sc);
788 
789 	bridge_stop(ifp, 1);
790 	ifp->if_flags &= ~IFF_UP;
791 
792 	while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
793 		bridge_delete_member(sc, bif, 0);
794 
795 	while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
796 		bridge_delete_span(sc, bif);
797 	}
798 
799 	/* Tear down the routing table. */
800 	bridge_rtable_fini(sc);
801 
802 	BRIDGE_UNLOCK(sc);
803 
804 	NET_EPOCH_ENTER(et);
805 
806 	callout_drain(&sc->sc_brcallout);
807 
808 	BRIDGE_LIST_LOCK();
809 	LIST_REMOVE(sc, sc_list);
810 	BRIDGE_LIST_UNLOCK();
811 
812 	bstp_detach(&sc->sc_stp);
813 #ifdef ALTQ
814 	IFQ_PURGE(&ifp->if_snd);
815 #endif
816 	NET_EPOCH_EXIT(et);
817 
818 	ether_ifdetach(ifp);
819 	if_free(ifp);
820 
821 	NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx);
822 }
823 
824 /*
825  * bridge_ioctl:
826  *
827  *	Handle a control request from the operator.
828  */
829 static int
830 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
831 {
832 	struct bridge_softc *sc = ifp->if_softc;
833 	struct ifreq *ifr = (struct ifreq *)data;
834 	struct bridge_iflist *bif;
835 	struct thread *td = curthread;
836 	union {
837 		struct ifbreq ifbreq;
838 		struct ifbifconf ifbifconf;
839 		struct ifbareq ifbareq;
840 		struct ifbaconf ifbaconf;
841 		struct ifbrparam ifbrparam;
842 		struct ifbropreq ifbropreq;
843 	} args;
844 	struct ifdrv *ifd = (struct ifdrv *) data;
845 	const struct bridge_control *bc;
846 	int error = 0, oldmtu;
847 
848 	BRIDGE_LOCK(sc);
849 
850 	switch (cmd) {
851 	case SIOCADDMULTI:
852 	case SIOCDELMULTI:
853 		break;
854 
855 	case SIOCGDRVSPEC:
856 	case SIOCSDRVSPEC:
857 		if (ifd->ifd_cmd >= bridge_control_table_size) {
858 			error = EINVAL;
859 			break;
860 		}
861 		bc = &bridge_control_table[ifd->ifd_cmd];
862 
863 		if (cmd == SIOCGDRVSPEC &&
864 		    (bc->bc_flags & BC_F_COPYOUT) == 0) {
865 			error = EINVAL;
866 			break;
867 		}
868 		else if (cmd == SIOCSDRVSPEC &&
869 		    (bc->bc_flags & BC_F_COPYOUT) != 0) {
870 			error = EINVAL;
871 			break;
872 		}
873 
874 		if (bc->bc_flags & BC_F_SUSER) {
875 			error = priv_check(td, PRIV_NET_BRIDGE);
876 			if (error)
877 				break;
878 		}
879 
880 		if (ifd->ifd_len != bc->bc_argsize ||
881 		    ifd->ifd_len > sizeof(args)) {
882 			error = EINVAL;
883 			break;
884 		}
885 
886 		bzero(&args, sizeof(args));
887 		if (bc->bc_flags & BC_F_COPYIN) {
888 			error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
889 			if (error)
890 				break;
891 		}
892 
893 		oldmtu = ifp->if_mtu;
894 		error = (*bc->bc_func)(sc, &args);
895 		if (error)
896 			break;
897 
898 		/*
899 		 * Bridge MTU may change during addition of the first port.
900 		 * If it did, do network layer specific procedure.
901 		 */
902 		if (ifp->if_mtu != oldmtu) {
903 #ifdef INET6
904 			nd6_setmtu(ifp);
905 #endif
906 			rt_updatemtu(ifp);
907 		}
908 
909 		if (bc->bc_flags & BC_F_COPYOUT)
910 			error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
911 
912 		break;
913 
914 	case SIOCSIFFLAGS:
915 		if (!(ifp->if_flags & IFF_UP) &&
916 		    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
917 			/*
918 			 * If interface is marked down and it is running,
919 			 * then stop and disable it.
920 			 */
921 			bridge_stop(ifp, 1);
922 		} else if ((ifp->if_flags & IFF_UP) &&
923 		    !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
924 			/*
925 			 * If interface is marked up and it is stopped, then
926 			 * start it.
927 			 */
928 			BRIDGE_UNLOCK(sc);
929 			(*ifp->if_init)(sc);
930 			BRIDGE_LOCK(sc);
931 		}
932 		break;
933 
934 	case SIOCSIFMTU:
935 		oldmtu = sc->sc_ifp->if_mtu;
936 
937 		if (ifr->ifr_mtu < 576) {
938 			error = EINVAL;
939 			break;
940 		}
941 		if (CK_LIST_EMPTY(&sc->sc_iflist)) {
942 			sc->sc_ifp->if_mtu = ifr->ifr_mtu;
943 			break;
944 		}
945 		CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
946 			error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
947 			    SIOCSIFMTU, (caddr_t)ifr);
948 			if (error != 0) {
949 				log(LOG_NOTICE, "%s: invalid MTU: %u for"
950 				    " member %s\n", sc->sc_ifp->if_xname,
951 				    ifr->ifr_mtu,
952 				    bif->bif_ifp->if_xname);
953 				error = EINVAL;
954 				break;
955 			}
956 		}
957 		if (error) {
958 			/* Restore the previous MTU on all member interfaces. */
959 			ifr->ifr_mtu = oldmtu;
960 			CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
961 				(*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
962 				    SIOCSIFMTU, (caddr_t)ifr);
963 			}
964 		} else {
965 			sc->sc_ifp->if_mtu = ifr->ifr_mtu;
966 		}
967 		break;
968 	default:
969 		/*
970 		 * drop the lock as ether_ioctl() will call bridge_start() and
971 		 * cause the lock to be recursed.
972 		 */
973 		BRIDGE_UNLOCK(sc);
974 		error = ether_ioctl(ifp, cmd, data);
975 		BRIDGE_LOCK(sc);
976 		break;
977 	}
978 
979 	BRIDGE_UNLOCK(sc);
980 
981 	return (error);
982 }
983 
984 /*
985  * bridge_mutecaps:
986  *
987  *	Clear or restore unwanted capabilities on the member interface
988  */
989 static void
990 bridge_mutecaps(struct bridge_softc *sc)
991 {
992 	struct bridge_iflist *bif;
993 	int enabled, mask;
994 
995 	BRIDGE_LOCK_ASSERT(sc);
996 
997 	/* Initial bitmask of capabilities to test */
998 	mask = BRIDGE_IFCAPS_MASK;
999 
1000 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1001 		/* Every member must support it or its disabled */
1002 		mask &= bif->bif_savedcaps;
1003 	}
1004 
1005 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1006 		enabled = bif->bif_ifp->if_capenable;
1007 		enabled &= ~BRIDGE_IFCAPS_STRIP;
1008 		/* strip off mask bits and enable them again if allowed */
1009 		enabled &= ~BRIDGE_IFCAPS_MASK;
1010 		enabled |= mask;
1011 		bridge_set_ifcap(sc, bif, enabled);
1012 	}
1013 }
1014 
1015 static void
1016 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
1017 {
1018 	struct ifnet *ifp = bif->bif_ifp;
1019 	struct ifreq ifr;
1020 	int error, mask, stuck;
1021 
1022 	bzero(&ifr, sizeof(ifr));
1023 	ifr.ifr_reqcap = set;
1024 
1025 	if (ifp->if_capenable != set) {
1026 		error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
1027 		if (error)
1028 			if_printf(sc->sc_ifp,
1029 			    "error setting capabilities on %s: %d\n",
1030 			    ifp->if_xname, error);
1031 		mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1032 		stuck = ifp->if_capenable & mask & ~set;
1033 		if (stuck != 0)
1034 			if_printf(sc->sc_ifp,
1035 			    "can't disable some capabilities on %s: 0x%x\n",
1036 			    ifp->if_xname, stuck);
1037 	}
1038 }
1039 
1040 /*
1041  * bridge_lookup_member:
1042  *
1043  *	Lookup a bridge member interface.
1044  */
1045 static struct bridge_iflist *
1046 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1047 {
1048 	struct bridge_iflist *bif;
1049 	struct ifnet *ifp;
1050 
1051 	BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1052 
1053 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1054 		ifp = bif->bif_ifp;
1055 		if (strcmp(ifp->if_xname, name) == 0)
1056 			return (bif);
1057 	}
1058 
1059 	return (NULL);
1060 }
1061 
1062 /*
1063  * bridge_lookup_member_if:
1064  *
1065  *	Lookup a bridge member interface by ifnet*.
1066  */
1067 static struct bridge_iflist *
1068 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1069 {
1070 	struct bridge_iflist *bif;
1071 
1072 	BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1073 
1074 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1075 		if (bif->bif_ifp == member_ifp)
1076 			return (bif);
1077 	}
1078 
1079 	return (NULL);
1080 }
1081 
1082 static void
1083 bridge_delete_member_cb(struct epoch_context *ctx)
1084 {
1085 	struct bridge_iflist *bif;
1086 
1087 	bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx);
1088 
1089 	free(bif, M_DEVBUF);
1090 }
1091 
1092 /*
1093  * bridge_delete_member:
1094  *
1095  *	Delete the specified member interface.
1096  */
1097 static void
1098 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1099     int gone)
1100 {
1101 	struct ifnet *ifs = bif->bif_ifp;
1102 	struct ifnet *fif = NULL;
1103 	struct bridge_iflist *bifl;
1104 
1105 	BRIDGE_LOCK_ASSERT(sc);
1106 
1107 	if (bif->bif_flags & IFBIF_STP)
1108 		bstp_disable(&bif->bif_stp);
1109 
1110 	ifs->if_bridge = NULL;
1111 	CK_LIST_REMOVE(bif, bif_next);
1112 
1113 	/*
1114 	 * If removing the interface that gave the bridge its mac address, set
1115 	 * the mac address of the bridge to the address of the next member, or
1116 	 * to its default address if no members are left.
1117 	 */
1118 	if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1119 		if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1120 			bcopy(&sc->sc_defaddr,
1121 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1122 			sc->sc_ifaddr = NULL;
1123 		} else {
1124 			bifl = CK_LIST_FIRST(&sc->sc_iflist);
1125 			fif = bifl->bif_ifp;
1126 			bcopy(IF_LLADDR(fif),
1127 			    IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1128 			sc->sc_ifaddr = fif;
1129 		}
1130 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1131 	}
1132 
1133 	bridge_linkcheck(sc);
1134 	bridge_mutecaps(sc);	/* recalcuate now this interface is removed */
1135 	BRIDGE_RT_LOCK(sc);
1136 	bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1137 	BRIDGE_RT_UNLOCK(sc);
1138 	KASSERT(bif->bif_addrcnt == 0,
1139 	    ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1140 
1141 	ifs->if_bridge_output = NULL;
1142 	ifs->if_bridge_input = NULL;
1143 	ifs->if_bridge_linkstate = NULL;
1144 	if (!gone) {
1145 		switch (ifs->if_type) {
1146 		case IFT_ETHER:
1147 		case IFT_L2VLAN:
1148 			/*
1149 			 * Take the interface out of promiscuous mode, but only
1150 			 * if it was promiscuous in the first place. It might
1151 			 * not be if we're in the bridge_ioctl_add() error path.
1152 			 */
1153 			if (ifs->if_flags & IFF_PROMISC)
1154 				(void) ifpromisc(ifs, 0);
1155 			break;
1156 
1157 		case IFT_GIF:
1158 			break;
1159 
1160 		default:
1161 #ifdef DIAGNOSTIC
1162 			panic("bridge_delete_member: impossible");
1163 #endif
1164 			break;
1165 		}
1166 		/* reneable any interface capabilities */
1167 		bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1168 	}
1169 	bstp_destroy(&bif->bif_stp);	/* prepare to free */
1170 
1171 	NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1172 }
1173 
1174 /*
1175  * bridge_delete_span:
1176  *
1177  *	Delete the specified span interface.
1178  */
1179 static void
1180 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1181 {
1182 	BRIDGE_LOCK_ASSERT(sc);
1183 
1184 	KASSERT(bif->bif_ifp->if_bridge == NULL,
1185 	    ("%s: not a span interface", __func__));
1186 
1187 	CK_LIST_REMOVE(bif, bif_next);
1188 
1189 	NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1190 }
1191 
1192 static int
1193 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1194 {
1195 	struct ifbreq *req = arg;
1196 	struct bridge_iflist *bif = NULL;
1197 	struct ifnet *ifs;
1198 	int error = 0;
1199 
1200 	ifs = ifunit(req->ifbr_ifsname);
1201 	if (ifs == NULL)
1202 		return (ENOENT);
1203 	if (ifs->if_ioctl == NULL)	/* must be supported */
1204 		return (EINVAL);
1205 
1206 	/* If it's in the span list, it can't be a member. */
1207 	CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1208 		if (ifs == bif->bif_ifp)
1209 			return (EBUSY);
1210 
1211 	if (ifs->if_bridge == sc)
1212 		return (EEXIST);
1213 
1214 	if (ifs->if_bridge != NULL)
1215 		return (EBUSY);
1216 
1217 	switch (ifs->if_type) {
1218 	case IFT_ETHER:
1219 	case IFT_L2VLAN:
1220 	case IFT_GIF:
1221 		/* permitted interface types */
1222 		break;
1223 	default:
1224 		return (EINVAL);
1225 	}
1226 
1227 #ifdef INET6
1228 	/*
1229 	 * Two valid inet6 addresses with link-local scope must not be
1230 	 * on the parent interface and the member interfaces at the
1231 	 * same time.  This restriction is needed to prevent violation
1232 	 * of link-local scope zone.  Attempts to add a member
1233 	 * interface which has inet6 addresses when the parent has
1234 	 * inet6 triggers removal of all inet6 addresses on the member
1235 	 * interface.
1236 	 */
1237 
1238 	/* Check if the parent interface has a link-local scope addr. */
1239 	if (V_allow_llz_overlap == 0 &&
1240 	    in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1241 		/*
1242 		 * If any, remove all inet6 addresses from the member
1243 		 * interfaces.
1244 		 */
1245 		CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1246  			if (in6ifa_llaonifp(bif->bif_ifp)) {
1247 				in6_ifdetach(bif->bif_ifp);
1248 				if_printf(sc->sc_ifp,
1249 				    "IPv6 addresses on %s have been removed "
1250 				    "before adding it as a member to prevent "
1251 				    "IPv6 address scope violation.\n",
1252 				    bif->bif_ifp->if_xname);
1253 			}
1254 		}
1255 		if (in6ifa_llaonifp(ifs)) {
1256 			in6_ifdetach(ifs);
1257 			if_printf(sc->sc_ifp,
1258 			    "IPv6 addresses on %s have been removed "
1259 			    "before adding it as a member to prevent "
1260 			    "IPv6 address scope violation.\n",
1261 			    ifs->if_xname);
1262 		}
1263 	}
1264 #endif
1265 	/* Allow the first Ethernet member to define the MTU */
1266 	if (CK_LIST_EMPTY(&sc->sc_iflist))
1267 		sc->sc_ifp->if_mtu = ifs->if_mtu;
1268 	else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1269 		if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1270 		    ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1271 		return (EINVAL);
1272 	}
1273 
1274 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1275 	if (bif == NULL)
1276 		return (ENOMEM);
1277 
1278 	bif->bif_ifp = ifs;
1279 	bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1280 	bif->bif_savedcaps = ifs->if_capenable;
1281 
1282 	/*
1283 	 * Assign the interface's MAC address to the bridge if it's the first
1284 	 * member and the MAC address of the bridge has not been changed from
1285 	 * the default randomly generated one.
1286 	 */
1287 	if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1288 	    !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1289 		bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1290 		sc->sc_ifaddr = ifs;
1291 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1292 	}
1293 
1294 	ifs->if_bridge = sc;
1295 	ifs->if_bridge_output = bridge_output;
1296 	ifs->if_bridge_input = bridge_input;
1297 	ifs->if_bridge_linkstate = bridge_linkstate;
1298 	bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1299 	/*
1300 	 * XXX: XLOCK HERE!?!
1301 	 *
1302 	 * NOTE: insert_***HEAD*** should be safe for the traversals.
1303 	 */
1304 	CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1305 
1306 	/* Set interface capabilities to the intersection set of all members */
1307 	bridge_mutecaps(sc);
1308 	bridge_linkcheck(sc);
1309 
1310 	/* Place the interface into promiscuous mode */
1311 	switch (ifs->if_type) {
1312 		case IFT_ETHER:
1313 		case IFT_L2VLAN:
1314 			error = ifpromisc(ifs, 1);
1315 			break;
1316 	}
1317 
1318 	if (error)
1319 		bridge_delete_member(sc, bif, 0);
1320 	return (error);
1321 }
1322 
1323 static int
1324 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1325 {
1326 	struct ifbreq *req = arg;
1327 	struct bridge_iflist *bif;
1328 
1329 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1330 	if (bif == NULL)
1331 		return (ENOENT);
1332 
1333 	bridge_delete_member(sc, bif, 0);
1334 
1335 	return (0);
1336 }
1337 
1338 static int
1339 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1340 {
1341 	struct ifbreq *req = arg;
1342 	struct bridge_iflist *bif;
1343 	struct bstp_port *bp;
1344 
1345 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1346 	if (bif == NULL)
1347 		return (ENOENT);
1348 
1349 	bp = &bif->bif_stp;
1350 	req->ifbr_ifsflags = bif->bif_flags;
1351 	req->ifbr_state = bp->bp_state;
1352 	req->ifbr_priority = bp->bp_priority;
1353 	req->ifbr_path_cost = bp->bp_path_cost;
1354 	req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1355 	req->ifbr_proto = bp->bp_protover;
1356 	req->ifbr_role = bp->bp_role;
1357 	req->ifbr_stpflags = bp->bp_flags;
1358 	req->ifbr_addrcnt = bif->bif_addrcnt;
1359 	req->ifbr_addrmax = bif->bif_addrmax;
1360 	req->ifbr_addrexceeded = bif->bif_addrexceeded;
1361 
1362 	/* Copy STP state options as flags */
1363 	if (bp->bp_operedge)
1364 		req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1365 	if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1366 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1367 	if (bp->bp_ptp_link)
1368 		req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1369 	if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1370 		req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1371 	if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1372 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1373 	if (bp->bp_flags & BSTP_PORT_ADMCOST)
1374 		req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1375 	return (0);
1376 }
1377 
1378 static int
1379 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1380 {
1381 	struct epoch_tracker et;
1382 	struct ifbreq *req = arg;
1383 	struct bridge_iflist *bif;
1384 	struct bstp_port *bp;
1385 	int error;
1386 
1387 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1388 	if (bif == NULL)
1389 		return (ENOENT);
1390 	bp = &bif->bif_stp;
1391 
1392 	if (req->ifbr_ifsflags & IFBIF_SPAN)
1393 		/* SPAN is readonly */
1394 		return (EINVAL);
1395 
1396 	NET_EPOCH_ENTER(et);
1397 
1398 	if (req->ifbr_ifsflags & IFBIF_STP) {
1399 		if ((bif->bif_flags & IFBIF_STP) == 0) {
1400 			error = bstp_enable(&bif->bif_stp);
1401 			if (error) {
1402 				NET_EPOCH_EXIT(et);
1403 				return (error);
1404 			}
1405 		}
1406 	} else {
1407 		if ((bif->bif_flags & IFBIF_STP) != 0)
1408 			bstp_disable(&bif->bif_stp);
1409 	}
1410 
1411 	/* Pass on STP flags */
1412 	bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1413 	bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1414 	bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1415 	bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1416 
1417 	/* Save the bits relating to the bridge */
1418 	bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1419 
1420 	NET_EPOCH_EXIT(et);
1421 
1422 	return (0);
1423 }
1424 
1425 static int
1426 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1427 {
1428 	struct ifbrparam *param = arg;
1429 
1430 	sc->sc_brtmax = param->ifbrp_csize;
1431 	bridge_rttrim(sc);
1432 
1433 	return (0);
1434 }
1435 
1436 static int
1437 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1438 {
1439 	struct ifbrparam *param = arg;
1440 
1441 	param->ifbrp_csize = sc->sc_brtmax;
1442 
1443 	return (0);
1444 }
1445 
1446 static int
1447 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1448 {
1449 	struct ifbifconf *bifc = arg;
1450 	struct bridge_iflist *bif;
1451 	struct ifbreq breq;
1452 	char *buf, *outbuf;
1453 	int count, buflen, len, error = 0;
1454 
1455 	count = 0;
1456 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1457 		count++;
1458 	CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1459 		count++;
1460 
1461 	buflen = sizeof(breq) * count;
1462 	if (bifc->ifbic_len == 0) {
1463 		bifc->ifbic_len = buflen;
1464 		return (0);
1465 	}
1466 	outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1467 	if (outbuf == NULL)
1468 		return (ENOMEM);
1469 
1470 	count = 0;
1471 	buf = outbuf;
1472 	len = min(bifc->ifbic_len, buflen);
1473 	bzero(&breq, sizeof(breq));
1474 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1475 		if (len < sizeof(breq))
1476 			break;
1477 
1478 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1479 		    sizeof(breq.ifbr_ifsname));
1480 		/* Fill in the ifbreq structure */
1481 		error = bridge_ioctl_gifflags(sc, &breq);
1482 		if (error)
1483 			break;
1484 		memcpy(buf, &breq, sizeof(breq));
1485 		count++;
1486 		buf += sizeof(breq);
1487 		len -= sizeof(breq);
1488 	}
1489 	CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1490 		if (len < sizeof(breq))
1491 			break;
1492 
1493 		strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1494 		    sizeof(breq.ifbr_ifsname));
1495 		breq.ifbr_ifsflags = bif->bif_flags;
1496 		breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1497 		memcpy(buf, &breq, sizeof(breq));
1498 		count++;
1499 		buf += sizeof(breq);
1500 		len -= sizeof(breq);
1501 	}
1502 
1503 	bifc->ifbic_len = sizeof(breq) * count;
1504 	error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1505 	free(outbuf, M_TEMP);
1506 	return (error);
1507 }
1508 
1509 static int
1510 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1511 {
1512 	struct ifbaconf *bac = arg;
1513 	struct bridge_rtnode *brt;
1514 	struct ifbareq bareq;
1515 	char *buf, *outbuf;
1516 	int count, buflen, len, error = 0;
1517 
1518 	if (bac->ifbac_len == 0)
1519 		return (0);
1520 
1521 	count = 0;
1522 	CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1523 		count++;
1524 	buflen = sizeof(bareq) * count;
1525 
1526 	outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1527 	if (outbuf == NULL)
1528 		return (ENOMEM);
1529 
1530 	count = 0;
1531 	buf = outbuf;
1532 	len = min(bac->ifbac_len, buflen);
1533 	bzero(&bareq, sizeof(bareq));
1534 	CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1535 		if (len < sizeof(bareq))
1536 			goto out;
1537 		strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1538 		    sizeof(bareq.ifba_ifsname));
1539 		memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1540 		bareq.ifba_vlan = brt->brt_vlan;
1541 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1542 				time_uptime < brt->brt_expire)
1543 			bareq.ifba_expire = brt->brt_expire - time_uptime;
1544 		else
1545 			bareq.ifba_expire = 0;
1546 		bareq.ifba_flags = brt->brt_flags;
1547 
1548 		memcpy(buf, &bareq, sizeof(bareq));
1549 		count++;
1550 		buf += sizeof(bareq);
1551 		len -= sizeof(bareq);
1552 	}
1553 out:
1554 	bac->ifbac_len = sizeof(bareq) * count;
1555 	error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1556 	free(outbuf, M_TEMP);
1557 	return (error);
1558 }
1559 
1560 static int
1561 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1562 {
1563 	struct ifbareq *req = arg;
1564 	struct bridge_iflist *bif;
1565 	struct epoch_tracker et;
1566 	int error;
1567 
1568 	NET_EPOCH_ENTER(et);
1569 	bif = bridge_lookup_member(sc, req->ifba_ifsname);
1570 	if (bif == NULL) {
1571 		NET_EPOCH_EXIT(et);
1572 		return (ENOENT);
1573 	}
1574 
1575 	/* bridge_rtupdate() may acquire the lock. */
1576 	error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1577 	    req->ifba_flags);
1578 	NET_EPOCH_EXIT(et);
1579 
1580 	return (error);
1581 }
1582 
1583 static int
1584 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1585 {
1586 	struct ifbrparam *param = arg;
1587 
1588 	sc->sc_brttimeout = param->ifbrp_ctime;
1589 	return (0);
1590 }
1591 
1592 static int
1593 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1594 {
1595 	struct ifbrparam *param = arg;
1596 
1597 	param->ifbrp_ctime = sc->sc_brttimeout;
1598 	return (0);
1599 }
1600 
1601 static int
1602 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1603 {
1604 	struct ifbareq *req = arg;
1605 
1606 	return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1607 }
1608 
1609 static int
1610 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1611 {
1612 	struct ifbreq *req = arg;
1613 
1614 	BRIDGE_RT_LOCK(sc);
1615 	bridge_rtflush(sc, req->ifbr_ifsflags);
1616 	BRIDGE_RT_UNLOCK(sc);
1617 
1618 	return (0);
1619 }
1620 
1621 static int
1622 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1623 {
1624 	struct ifbrparam *param = arg;
1625 	struct bstp_state *bs = &sc->sc_stp;
1626 
1627 	param->ifbrp_prio = bs->bs_bridge_priority;
1628 	return (0);
1629 }
1630 
1631 static int
1632 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1633 {
1634 	struct ifbrparam *param = arg;
1635 
1636 	return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1637 }
1638 
1639 static int
1640 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1641 {
1642 	struct ifbrparam *param = arg;
1643 	struct bstp_state *bs = &sc->sc_stp;
1644 
1645 	param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1646 	return (0);
1647 }
1648 
1649 static int
1650 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1651 {
1652 	struct ifbrparam *param = arg;
1653 
1654 	return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1655 }
1656 
1657 static int
1658 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1659 {
1660 	struct ifbrparam *param = arg;
1661 	struct bstp_state *bs = &sc->sc_stp;
1662 
1663 	param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1664 	return (0);
1665 }
1666 
1667 static int
1668 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1669 {
1670 	struct ifbrparam *param = arg;
1671 
1672 	return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1673 }
1674 
1675 static int
1676 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1677 {
1678 	struct ifbrparam *param = arg;
1679 	struct bstp_state *bs = &sc->sc_stp;
1680 
1681 	param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1682 	return (0);
1683 }
1684 
1685 static int
1686 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1687 {
1688 	struct ifbrparam *param = arg;
1689 
1690 	return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1691 }
1692 
1693 static int
1694 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1695 {
1696 	struct ifbreq *req = arg;
1697 	struct bridge_iflist *bif;
1698 
1699 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1700 	if (bif == NULL)
1701 		return (ENOENT);
1702 
1703 	return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1704 }
1705 
1706 static int
1707 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1708 {
1709 	struct ifbreq *req = arg;
1710 	struct bridge_iflist *bif;
1711 
1712 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1713 	if (bif == NULL)
1714 		return (ENOENT);
1715 
1716 	return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1717 }
1718 
1719 static int
1720 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1721 {
1722 	struct ifbreq *req = arg;
1723 	struct bridge_iflist *bif;
1724 
1725 	bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1726 	if (bif == NULL)
1727 		return (ENOENT);
1728 
1729 	bif->bif_addrmax = req->ifbr_addrmax;
1730 	return (0);
1731 }
1732 
1733 static int
1734 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1735 {
1736 	struct ifbreq *req = arg;
1737 	struct bridge_iflist *bif = NULL;
1738 	struct ifnet *ifs;
1739 
1740 	ifs = ifunit(req->ifbr_ifsname);
1741 	if (ifs == NULL)
1742 		return (ENOENT);
1743 
1744 	CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1745 		if (ifs == bif->bif_ifp)
1746 			return (EBUSY);
1747 
1748 	if (ifs->if_bridge != NULL)
1749 		return (EBUSY);
1750 
1751 	switch (ifs->if_type) {
1752 		case IFT_ETHER:
1753 		case IFT_GIF:
1754 		case IFT_L2VLAN:
1755 			break;
1756 		default:
1757 			return (EINVAL);
1758 	}
1759 
1760 	bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1761 	if (bif == NULL)
1762 		return (ENOMEM);
1763 
1764 	bif->bif_ifp = ifs;
1765 	bif->bif_flags = IFBIF_SPAN;
1766 
1767 	CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1768 
1769 	return (0);
1770 }
1771 
1772 static int
1773 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1774 {
1775 	struct ifbreq *req = arg;
1776 	struct bridge_iflist *bif;
1777 	struct ifnet *ifs;
1778 
1779 	ifs = ifunit(req->ifbr_ifsname);
1780 	if (ifs == NULL)
1781 		return (ENOENT);
1782 
1783 	CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1784 		if (ifs == bif->bif_ifp)
1785 			break;
1786 
1787 	if (bif == NULL)
1788 		return (ENOENT);
1789 
1790 	bridge_delete_span(sc, bif);
1791 
1792 	return (0);
1793 }
1794 
1795 static int
1796 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1797 {
1798 	struct ifbropreq *req = arg;
1799 	struct bstp_state *bs = &sc->sc_stp;
1800 	struct bstp_port *root_port;
1801 
1802 	req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1803 	req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1804 	req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1805 
1806 	root_port = bs->bs_root_port;
1807 	if (root_port == NULL)
1808 		req->ifbop_root_port = 0;
1809 	else
1810 		req->ifbop_root_port = root_port->bp_ifp->if_index;
1811 
1812 	req->ifbop_holdcount = bs->bs_txholdcount;
1813 	req->ifbop_priority = bs->bs_bridge_priority;
1814 	req->ifbop_protocol = bs->bs_protover;
1815 	req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1816 	req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1817 	req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1818 	req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1819 	req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1820 	req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1821 
1822 	return (0);
1823 }
1824 
1825 static int
1826 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1827 {
1828 	struct ifbrparam *param = arg;
1829 
1830 	param->ifbrp_cexceeded = sc->sc_brtexceeded;
1831 	return (0);
1832 }
1833 
1834 static int
1835 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1836 {
1837 	struct ifbpstpconf *bifstp = arg;
1838 	struct bridge_iflist *bif;
1839 	struct bstp_port *bp;
1840 	struct ifbpstpreq bpreq;
1841 	char *buf, *outbuf;
1842 	int count, buflen, len, error = 0;
1843 
1844 	count = 0;
1845 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1846 		if ((bif->bif_flags & IFBIF_STP) != 0)
1847 			count++;
1848 	}
1849 
1850 	buflen = sizeof(bpreq) * count;
1851 	if (bifstp->ifbpstp_len == 0) {
1852 		bifstp->ifbpstp_len = buflen;
1853 		return (0);
1854 	}
1855 
1856 	outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1857 	if (outbuf == NULL)
1858 		return (ENOMEM);
1859 
1860 	count = 0;
1861 	buf = outbuf;
1862 	len = min(bifstp->ifbpstp_len, buflen);
1863 	bzero(&bpreq, sizeof(bpreq));
1864 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1865 		if (len < sizeof(bpreq))
1866 			break;
1867 
1868 		if ((bif->bif_flags & IFBIF_STP) == 0)
1869 			continue;
1870 
1871 		bp = &bif->bif_stp;
1872 		bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1873 		bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1874 		bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1875 		bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1876 		bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1877 		bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1878 
1879 		memcpy(buf, &bpreq, sizeof(bpreq));
1880 		count++;
1881 		buf += sizeof(bpreq);
1882 		len -= sizeof(bpreq);
1883 	}
1884 
1885 	bifstp->ifbpstp_len = sizeof(bpreq) * count;
1886 	error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1887 	free(outbuf, M_TEMP);
1888 	return (error);
1889 }
1890 
1891 static int
1892 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1893 {
1894 	struct ifbrparam *param = arg;
1895 
1896 	return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1897 }
1898 
1899 static int
1900 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1901 {
1902 	struct ifbrparam *param = arg;
1903 
1904 	return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1905 }
1906 
1907 /*
1908  * bridge_ifdetach:
1909  *
1910  *	Detach an interface from a bridge.  Called when a member
1911  *	interface is detaching.
1912  */
1913 static void
1914 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1915 {
1916 	struct bridge_softc *sc = ifp->if_bridge;
1917 	struct bridge_iflist *bif;
1918 
1919 	if (ifp->if_flags & IFF_RENAMING)
1920 		return;
1921 	if (V_bridge_cloner == NULL) {
1922 		/*
1923 		 * This detach handler can be called after
1924 		 * vnet_bridge_uninit().  Just return in that case.
1925 		 */
1926 		return;
1927 	}
1928 	/* Check if the interface is a bridge member */
1929 	if (sc != NULL) {
1930 		BRIDGE_LOCK(sc);
1931 
1932 		bif = bridge_lookup_member_if(sc, ifp);
1933 		if (bif != NULL)
1934 			bridge_delete_member(sc, bif, 1);
1935 
1936 		BRIDGE_UNLOCK(sc);
1937 		return;
1938 	}
1939 
1940 	/* Check if the interface is a span port */
1941 	BRIDGE_LIST_LOCK();
1942 	LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1943 		BRIDGE_LOCK(sc);
1944 		CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1945 			if (ifp == bif->bif_ifp) {
1946 				bridge_delete_span(sc, bif);
1947 				break;
1948 			}
1949 
1950 		BRIDGE_UNLOCK(sc);
1951 	}
1952 	BRIDGE_LIST_UNLOCK();
1953 }
1954 
1955 /*
1956  * bridge_init:
1957  *
1958  *	Initialize a bridge interface.
1959  */
1960 static void
1961 bridge_init(void *xsc)
1962 {
1963 	struct bridge_softc *sc = (struct bridge_softc *)xsc;
1964 	struct ifnet *ifp = sc->sc_ifp;
1965 
1966 	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1967 		return;
1968 
1969 	BRIDGE_LOCK(sc);
1970 	callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1971 	    bridge_timer, sc);
1972 
1973 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
1974 	bstp_init(&sc->sc_stp);		/* Initialize Spanning Tree */
1975 
1976 	BRIDGE_UNLOCK(sc);
1977 }
1978 
1979 /*
1980  * bridge_stop:
1981  *
1982  *	Stop the bridge interface.
1983  */
1984 static void
1985 bridge_stop(struct ifnet *ifp, int disable)
1986 {
1987 	struct bridge_softc *sc = ifp->if_softc;
1988 
1989 	BRIDGE_LOCK_ASSERT(sc);
1990 
1991 	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1992 		return;
1993 
1994 	BRIDGE_RT_LOCK(sc);
1995 	callout_stop(&sc->sc_brcallout);
1996 
1997 	bstp_stop(&sc->sc_stp);
1998 
1999 	bridge_rtflush(sc, IFBF_FLUSHDYN);
2000 	BRIDGE_RT_UNLOCK(sc);
2001 
2002 	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2003 }
2004 
2005 /*
2006  * bridge_enqueue:
2007  *
2008  *	Enqueue a packet on a bridge member interface.
2009  *
2010  */
2011 static int
2012 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
2013 {
2014 	int len, err = 0;
2015 	short mflags;
2016 	struct mbuf *m0;
2017 
2018 	/* We may be sending a fragment so traverse the mbuf */
2019 	for (; m; m = m0) {
2020 		m0 = m->m_nextpkt;
2021 		m->m_nextpkt = NULL;
2022 		len = m->m_pkthdr.len;
2023 		mflags = m->m_flags;
2024 
2025 		/*
2026 		 * If underlying interface can not do VLAN tag insertion itself
2027 		 * then attach a packet tag that holds it.
2028 		 */
2029 		if ((m->m_flags & M_VLANTAG) &&
2030 		    (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
2031 			m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2032 			if (m == NULL) {
2033 				if_printf(dst_ifp,
2034 				    "unable to prepend VLAN header\n");
2035 				if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
2036 				continue;
2037 			}
2038 			m->m_flags &= ~M_VLANTAG;
2039 		}
2040 
2041 		M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
2042 		if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
2043 			m_freem(m0);
2044 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2045 			break;
2046 		}
2047 
2048 		if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2049 		if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2050 		if (mflags & M_MCAST)
2051 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2052 	}
2053 
2054 	return (err);
2055 }
2056 
2057 /*
2058  * bridge_dummynet:
2059  *
2060  * 	Receive a queued packet from dummynet and pass it on to the output
2061  * 	interface.
2062  *
2063  *	The mbuf has the Ethernet header already attached.
2064  */
2065 static void
2066 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2067 {
2068 	struct bridge_softc *sc;
2069 
2070 	sc = ifp->if_bridge;
2071 
2072 	/*
2073 	 * The packet didnt originate from a member interface. This should only
2074 	 * ever happen if a member interface is removed while packets are
2075 	 * queued for it.
2076 	 */
2077 	if (sc == NULL) {
2078 		m_freem(m);
2079 		return;
2080 	}
2081 
2082 	if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2083 #ifdef INET6
2084 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2085 #endif
2086 	    ) {
2087 		if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2088 			return;
2089 		if (m == NULL)
2090 			return;
2091 	}
2092 
2093 	bridge_enqueue(sc, ifp, m);
2094 }
2095 
2096 /*
2097  * bridge_output:
2098  *
2099  *	Send output from a bridge member interface.  This
2100  *	performs the bridging function for locally originated
2101  *	packets.
2102  *
2103  *	The mbuf has the Ethernet header already attached.  We must
2104  *	enqueue or free the mbuf before returning.
2105  */
2106 static int
2107 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2108     struct rtentry *rt)
2109 {
2110 	struct ether_header *eh;
2111 	struct ifnet *bifp, *dst_if;
2112 	struct bridge_softc *sc;
2113 	uint16_t vlan;
2114 
2115 	NET_EPOCH_ASSERT();
2116 
2117 	if (m->m_len < ETHER_HDR_LEN) {
2118 		m = m_pullup(m, ETHER_HDR_LEN);
2119 		if (m == NULL)
2120 			return (0);
2121 	}
2122 
2123 	eh = mtod(m, struct ether_header *);
2124 	sc = ifp->if_bridge;
2125 	vlan = VLANTAGOF(m);
2126 
2127 	bifp = sc->sc_ifp;
2128 
2129 	/*
2130 	 * If bridge is down, but the original output interface is up,
2131 	 * go ahead and send out that interface.  Otherwise, the packet
2132 	 * is dropped below.
2133 	 */
2134 	if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2135 		dst_if = ifp;
2136 		goto sendunicast;
2137 	}
2138 
2139 	/*
2140 	 * If the packet is a multicast, or we don't know a better way to
2141 	 * get there, send to all interfaces.
2142 	 */
2143 	if (ETHER_IS_MULTICAST(eh->ether_dhost))
2144 		dst_if = NULL;
2145 	else
2146 		dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2147 	/* Tap any traffic not passing back out the originating interface */
2148 	if (dst_if != ifp)
2149 		ETHER_BPF_MTAP(bifp, m);
2150 	if (dst_if == NULL) {
2151 		struct bridge_iflist *bif;
2152 		struct mbuf *mc;
2153 		int used = 0;
2154 
2155 		bridge_span(sc, m);
2156 
2157 		CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2158 			dst_if = bif->bif_ifp;
2159 
2160 			if (dst_if->if_type == IFT_GIF)
2161 				continue;
2162 			if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2163 				continue;
2164 
2165 			/*
2166 			 * If this is not the original output interface,
2167 			 * and the interface is participating in spanning
2168 			 * tree, make sure the port is in a state that
2169 			 * allows forwarding.
2170 			 */
2171 			if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2172 			    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2173 				continue;
2174 
2175 			if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2176 				used = 1;
2177 				mc = m;
2178 			} else {
2179 				mc = m_dup(m, M_NOWAIT);
2180 				if (mc == NULL) {
2181 					if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2182 					continue;
2183 				}
2184 			}
2185 
2186 			bridge_enqueue(sc, dst_if, mc);
2187 		}
2188 		if (used == 0)
2189 			m_freem(m);
2190 		return (0);
2191 	}
2192 
2193 sendunicast:
2194 	/*
2195 	 * XXX Spanning tree consideration here?
2196 	 */
2197 
2198 	bridge_span(sc, m);
2199 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2200 		m_freem(m);
2201 		return (0);
2202 	}
2203 
2204 	bridge_enqueue(sc, dst_if, m);
2205 	return (0);
2206 }
2207 
2208 /*
2209  * bridge_transmit:
2210  *
2211  *	Do output on a bridge.
2212  *
2213  */
2214 static int
2215 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2216 {
2217 	struct bridge_softc *sc;
2218 	struct ether_header *eh;
2219 	struct ifnet *dst_if;
2220 	int error = 0;
2221 
2222 	sc = ifp->if_softc;
2223 
2224 	ETHER_BPF_MTAP(ifp, m);
2225 
2226 	eh = mtod(m, struct ether_header *);
2227 
2228 	if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2229 	    (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2230 		error = bridge_enqueue(sc, dst_if, m);
2231 	} else
2232 		bridge_broadcast(sc, ifp, m, 0);
2233 
2234 	return (error);
2235 }
2236 
2237 #ifdef ALTQ
2238 static void
2239 bridge_altq_start(if_t ifp)
2240 {
2241 	struct ifaltq *ifq = &ifp->if_snd;
2242 	struct mbuf *m;
2243 
2244 	IFQ_LOCK(ifq);
2245 	IFQ_DEQUEUE_NOLOCK(ifq, m);
2246 	while (m != NULL) {
2247 		bridge_transmit(ifp, m);
2248 		IFQ_DEQUEUE_NOLOCK(ifq, m);
2249 	}
2250 	IFQ_UNLOCK(ifq);
2251 }
2252 
2253 static int
2254 bridge_altq_transmit(if_t ifp, struct mbuf *m)
2255 {
2256 	int err;
2257 
2258 	if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
2259 		IFQ_ENQUEUE(&ifp->if_snd, m, err);
2260 		if (err == 0)
2261 			bridge_altq_start(ifp);
2262 	} else
2263 		err = bridge_transmit(ifp, m);
2264 
2265 	return (err);
2266 }
2267 #endif	/* ALTQ */
2268 
2269 /*
2270  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2271  */
2272 static void
2273 bridge_qflush(struct ifnet *ifp __unused)
2274 {
2275 }
2276 
2277 /*
2278  * bridge_forward:
2279  *
2280  *	The forwarding function of the bridge.
2281  *
2282  *	NOTE: Releases the lock on return.
2283  */
2284 static void
2285 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2286     struct mbuf *m)
2287 {
2288 	struct bridge_iflist *dbif;
2289 	struct ifnet *src_if, *dst_if, *ifp;
2290 	struct ether_header *eh;
2291 	uint16_t vlan;
2292 	uint8_t *dst;
2293 	int error;
2294 
2295 	NET_EPOCH_ASSERT();
2296 
2297 	src_if = m->m_pkthdr.rcvif;
2298 	ifp = sc->sc_ifp;
2299 
2300 	if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2301 	if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2302 	vlan = VLANTAGOF(m);
2303 
2304 	if ((sbif->bif_flags & IFBIF_STP) &&
2305 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2306 		goto drop;
2307 
2308 	eh = mtod(m, struct ether_header *);
2309 	dst = eh->ether_dhost;
2310 
2311 	/* If the interface is learning, record the address. */
2312 	if (sbif->bif_flags & IFBIF_LEARNING) {
2313 		error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2314 		    sbif, 0, IFBAF_DYNAMIC);
2315 		/*
2316 		 * If the interface has addresses limits then deny any source
2317 		 * that is not in the cache.
2318 		 */
2319 		if (error && sbif->bif_addrmax)
2320 			goto drop;
2321 	}
2322 
2323 	if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2324 	    sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2325 		goto drop;
2326 
2327 	/*
2328 	 * At this point, the port either doesn't participate
2329 	 * in spanning tree or it is in the forwarding state.
2330 	 */
2331 
2332 	/*
2333 	 * If the packet is unicast, destined for someone on
2334 	 * "this" side of the bridge, drop it.
2335 	 */
2336 	if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2337 		dst_if = bridge_rtlookup(sc, dst, vlan);
2338 		if (src_if == dst_if)
2339 			goto drop;
2340 	} else {
2341 		/*
2342 		 * Check if its a reserved multicast address, any address
2343 		 * listed in 802.1D section 7.12.6 may not be forwarded by the
2344 		 * bridge.
2345 		 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2346 		 */
2347 		if (dst[0] == 0x01 && dst[1] == 0x80 &&
2348 		    dst[2] == 0xc2 && dst[3] == 0x00 &&
2349 		    dst[4] == 0x00 && dst[5] <= 0x0f)
2350 			goto drop;
2351 
2352 		/* ...forward it to all interfaces. */
2353 		if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2354 		dst_if = NULL;
2355 	}
2356 
2357 	/*
2358 	 * If we have a destination interface which is a member of our bridge,
2359 	 * OR this is a unicast packet, push it through the bpf(4) machinery.
2360 	 * For broadcast or multicast packets, don't bother because it will
2361 	 * be reinjected into ether_input. We do this before we pass the packets
2362 	 * through the pfil(9) framework, as it is possible that pfil(9) will
2363 	 * drop the packet, or possibly modify it, making it difficult to debug
2364 	 * firewall issues on the bridge.
2365 	 */
2366 	if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2367 		ETHER_BPF_MTAP(ifp, m);
2368 
2369 	/* run the packet filter */
2370 	if (PFIL_HOOKED_IN(V_inet_pfil_head)
2371 #ifdef INET6
2372 	    || PFIL_HOOKED_IN(V_inet6_pfil_head)
2373 #endif
2374 	    ) {
2375 		if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2376 			return;
2377 		if (m == NULL)
2378 			return;
2379 	}
2380 
2381 	if (dst_if == NULL) {
2382 		bridge_broadcast(sc, src_if, m, 1);
2383 		return;
2384 	}
2385 
2386 	/*
2387 	 * At this point, we're dealing with a unicast frame
2388 	 * going to a different interface.
2389 	 */
2390 	if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2391 		goto drop;
2392 
2393 	dbif = bridge_lookup_member_if(sc, dst_if);
2394 	if (dbif == NULL)
2395 		/* Not a member of the bridge (anymore?) */
2396 		goto drop;
2397 
2398 	/* Private segments can not talk to each other */
2399 	if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2400 		goto drop;
2401 
2402 	if ((dbif->bif_flags & IFBIF_STP) &&
2403 	    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2404 		goto drop;
2405 
2406 	if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2407 #ifdef INET6
2408 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2409 #endif
2410 	    ) {
2411 		if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2412 			return;
2413 		if (m == NULL)
2414 			return;
2415 	}
2416 
2417 	bridge_enqueue(sc, dst_if, m);
2418 	return;
2419 
2420 drop:
2421 	m_freem(m);
2422 }
2423 
2424 /*
2425  * bridge_input:
2426  *
2427  *	Receive input from a member interface.  Queue the packet for
2428  *	bridging if it is not for us.
2429  */
2430 static struct mbuf *
2431 bridge_input(struct ifnet *ifp, struct mbuf *m)
2432 {
2433 	struct bridge_softc *sc = ifp->if_bridge;
2434 	struct bridge_iflist *bif, *bif2;
2435 	struct ifnet *bifp;
2436 	struct ether_header *eh;
2437 	struct mbuf *mc, *mc2;
2438 	uint16_t vlan;
2439 	int error;
2440 
2441 	NET_EPOCH_ASSERT();
2442 
2443 	if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2444 		return (m);
2445 
2446 	bifp = sc->sc_ifp;
2447 	vlan = VLANTAGOF(m);
2448 
2449 	/*
2450 	 * Implement support for bridge monitoring. If this flag has been
2451 	 * set on this interface, discard the packet once we push it through
2452 	 * the bpf(4) machinery, but before we do, increment the byte and
2453 	 * packet counters associated with this interface.
2454 	 */
2455 	if ((bifp->if_flags & IFF_MONITOR) != 0) {
2456 		m->m_pkthdr.rcvif  = bifp;
2457 		ETHER_BPF_MTAP(bifp, m);
2458 		if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2459 		if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2460 		m_freem(m);
2461 		return (NULL);
2462 	}
2463 	bif = bridge_lookup_member_if(sc, ifp);
2464 	if (bif == NULL) {
2465 		return (m);
2466 	}
2467 
2468 	eh = mtod(m, struct ether_header *);
2469 
2470 	bridge_span(sc, m);
2471 
2472 	if (m->m_flags & (M_BCAST|M_MCAST)) {
2473 		/* Tap off 802.1D packets; they do not get forwarded. */
2474 		if (memcmp(eh->ether_dhost, bstp_etheraddr,
2475 		    ETHER_ADDR_LEN) == 0) {
2476 			bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2477 			return (NULL);
2478 		}
2479 
2480 		if ((bif->bif_flags & IFBIF_STP) &&
2481 		    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2482 			return (m);
2483 		}
2484 
2485 		/*
2486 		 * Make a deep copy of the packet and enqueue the copy
2487 		 * for bridge processing; return the original packet for
2488 		 * local processing.
2489 		 */
2490 		mc = m_dup(m, M_NOWAIT);
2491 		if (mc == NULL) {
2492 			return (m);
2493 		}
2494 
2495 		/* Perform the bridge forwarding function with the copy. */
2496 		bridge_forward(sc, bif, mc);
2497 
2498 		/*
2499 		 * Reinject the mbuf as arriving on the bridge so we have a
2500 		 * chance at claiming multicast packets. We can not loop back
2501 		 * here from ether_input as a bridge is never a member of a
2502 		 * bridge.
2503 		 */
2504 		KASSERT(bifp->if_bridge == NULL,
2505 		    ("loop created in bridge_input"));
2506 		mc2 = m_dup(m, M_NOWAIT);
2507 		if (mc2 != NULL) {
2508 			/* Keep the layer3 header aligned */
2509 			int i = min(mc2->m_pkthdr.len, max_protohdr);
2510 			mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2511 		}
2512 		if (mc2 != NULL) {
2513 			mc2->m_pkthdr.rcvif = bifp;
2514 			(*bifp->if_input)(bifp, mc2);
2515 		}
2516 
2517 		/* Return the original packet for local processing. */
2518 		return (m);
2519 	}
2520 
2521 	if ((bif->bif_flags & IFBIF_STP) &&
2522 	    bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2523 		return (m);
2524 	}
2525 
2526 #if (defined(INET) || defined(INET6))
2527 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2528 	|| ((iface)->if_carp \
2529 	    && (*carp_forus_p)((iface), eh->ether_dhost))
2530 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2531 	|| ((iface)->if_carp \
2532 	    && (*carp_forus_p)((iface), eh->ether_shost))
2533 #else
2534 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2535 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2536 #endif
2537 
2538 #ifdef INET6
2539 #   define OR_PFIL_HOOKED_INET6 \
2540 	|| PFIL_HOOKED_IN(V_inet6_pfil_head)
2541 #else
2542 #   define OR_PFIL_HOOKED_INET6
2543 #endif
2544 
2545 #define GRAB_OUR_PACKETS(iface) \
2546 	if ((iface)->if_type == IFT_GIF) \
2547 		continue; \
2548 	/* It is destined for us. */ \
2549 	if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2550 	    OR_CARP_CHECK_WE_ARE_DST((iface))				\
2551 	    ) {								\
2552 		if (bif->bif_flags & IFBIF_LEARNING) {			\
2553 			error = bridge_rtupdate(sc, eh->ether_shost,	\
2554 			    vlan, bif, 0, IFBAF_DYNAMIC);		\
2555 			if (error && bif->bif_addrmax) {		\
2556 				m_freem(m);				\
2557 				return (NULL);				\
2558 			}						\
2559 		}							\
2560 		m->m_pkthdr.rcvif = iface;				\
2561 		if ((iface) == ifp) {					\
2562 			/* Skip bridge processing... src == dest */	\
2563 			return (m);					\
2564 		}							\
2565 		/* It's passing over or to the bridge, locally. */	\
2566 		ETHER_BPF_MTAP(bifp, m);				\
2567 		if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);		\
2568 		if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2569 		/* Filter on the physical interface. */			\
2570 		if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2571 		     OR_PFIL_HOOKED_INET6)) {				\
2572 			if (bridge_pfil(&m, NULL, ifp,			\
2573 			    PFIL_IN) != 0 || m == NULL) {		\
2574 				return (NULL);				\
2575 			}						\
2576 		}							\
2577 		if ((iface) != bifp)					\
2578 			ETHER_BPF_MTAP(iface, m);			\
2579 		return (m);						\
2580 	}								\
2581 									\
2582 	/* We just received a packet that we sent out. */		\
2583 	if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2584 	    OR_CARP_CHECK_WE_ARE_SRC((iface))			\
2585 	    ) {								\
2586 		m_freem(m);						\
2587 		return (NULL);						\
2588 	}
2589 
2590 	/*
2591 	 * Unicast.  Make sure it's not for the bridge.
2592 	 */
2593 	do { GRAB_OUR_PACKETS(bifp) } while (0);
2594 
2595 	/*
2596 	 * Give a chance for ifp at first priority. This will help when	the
2597 	 * packet comes through the interface like VLAN's with the same MACs
2598 	 * on several interfaces from the same bridge. This also will save
2599 	 * some CPU cycles in case the destination interface and the input
2600 	 * interface (eq ifp) are the same.
2601 	 */
2602 	do { GRAB_OUR_PACKETS(ifp) } while (0);
2603 
2604 	/* Now check the all bridge members. */
2605 	CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2606 		GRAB_OUR_PACKETS(bif2->bif_ifp)
2607 	}
2608 
2609 #undef OR_CARP_CHECK_WE_ARE_DST
2610 #undef OR_CARP_CHECK_WE_ARE_SRC
2611 #undef OR_PFIL_HOOKED_INET6
2612 #undef GRAB_OUR_PACKETS
2613 
2614 	/* Perform the bridge forwarding function. */
2615 	bridge_forward(sc, bif, m);
2616 
2617 	return (NULL);
2618 }
2619 
2620 /*
2621  * bridge_broadcast:
2622  *
2623  *	Send a frame to all interfaces that are members of
2624  *	the bridge, except for the one on which the packet
2625  *	arrived.
2626  *
2627  *	NOTE: Releases the lock on return.
2628  */
2629 static void
2630 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2631     struct mbuf *m, int runfilt)
2632 {
2633 	struct bridge_iflist *dbif, *sbif;
2634 	struct mbuf *mc;
2635 	struct ifnet *dst_if;
2636 	int used = 0, i;
2637 
2638 	NET_EPOCH_ASSERT();
2639 
2640 	sbif = bridge_lookup_member_if(sc, src_if);
2641 
2642 	/* Filter on the bridge interface before broadcasting */
2643 	if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2644 #ifdef INET6
2645 	    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2646 #endif
2647 	    )) {
2648 		if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2649 			return;
2650 		if (m == NULL)
2651 			return;
2652 	}
2653 
2654 	CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2655 		dst_if = dbif->bif_ifp;
2656 		if (dst_if == src_if)
2657 			continue;
2658 
2659 		/* Private segments can not talk to each other */
2660 		if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2661 			continue;
2662 
2663 		if ((dbif->bif_flags & IFBIF_STP) &&
2664 		    dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2665 			continue;
2666 
2667 		if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2668 		    (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2669 			continue;
2670 
2671 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2672 			continue;
2673 
2674 		if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
2675 			mc = m;
2676 			used = 1;
2677 		} else {
2678 			mc = m_dup(m, M_NOWAIT);
2679 			if (mc == NULL) {
2680 				if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2681 				continue;
2682 			}
2683 		}
2684 
2685 		/*
2686 		 * Filter on the output interface. Pass a NULL bridge interface
2687 		 * pointer so we do not redundantly filter on the bridge for
2688 		 * each interface we broadcast on.
2689 		 */
2690 		if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2691 #ifdef INET6
2692 		    || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2693 #endif
2694 		    )) {
2695 			if (used == 0) {
2696 				/* Keep the layer3 header aligned */
2697 				i = min(mc->m_pkthdr.len, max_protohdr);
2698 				mc = m_copyup(mc, i, ETHER_ALIGN);
2699 				if (mc == NULL) {
2700 					if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2701 					continue;
2702 				}
2703 			}
2704 			if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2705 				continue;
2706 			if (mc == NULL)
2707 				continue;
2708 		}
2709 
2710 		bridge_enqueue(sc, dst_if, mc);
2711 	}
2712 	if (used == 0)
2713 		m_freem(m);
2714 }
2715 
2716 /*
2717  * bridge_span:
2718  *
2719  *	Duplicate a packet out one or more interfaces that are in span mode,
2720  *	the original mbuf is unmodified.
2721  */
2722 static void
2723 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2724 {
2725 	struct bridge_iflist *bif;
2726 	struct ifnet *dst_if;
2727 	struct mbuf *mc;
2728 
2729 	NET_EPOCH_ASSERT();
2730 
2731 	if (CK_LIST_EMPTY(&sc->sc_spanlist))
2732 		return;
2733 
2734 	CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2735 		dst_if = bif->bif_ifp;
2736 
2737 		if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2738 			continue;
2739 
2740 		mc = m_dup(m, M_NOWAIT);
2741 		if (mc == NULL) {
2742 			if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2743 			continue;
2744 		}
2745 
2746 		bridge_enqueue(sc, dst_if, mc);
2747 	}
2748 }
2749 
2750 /*
2751  * bridge_rtupdate:
2752  *
2753  *	Add a bridge routing entry.
2754  */
2755 static int
2756 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2757     struct bridge_iflist *bif, int setflags, uint8_t flags)
2758 {
2759 	struct bridge_rtnode *brt;
2760 	int error;
2761 
2762 	BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
2763 
2764 	/* Check the source address is valid and not multicast. */
2765 	if (ETHER_IS_MULTICAST(dst) ||
2766 	    (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2767 	     dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2768 		return (EINVAL);
2769 
2770 	/* 802.1p frames map to vlan 1 */
2771 	if (vlan == 0)
2772 		vlan = 1;
2773 
2774 	/*
2775 	 * A route for this destination might already exist.  If so,
2776 	 * update it, otherwise create a new one.
2777 	 */
2778 	if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2779 		BRIDGE_RT_LOCK(sc);
2780 
2781 		/* Check again, now that we have the lock. There could have
2782 		 * been a race and we only want to insert this once. */
2783 		if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) {
2784 			BRIDGE_RT_UNLOCK(sc);
2785 			return (0);
2786 		}
2787 
2788 		if (sc->sc_brtcnt >= sc->sc_brtmax) {
2789 			sc->sc_brtexceeded++;
2790 			BRIDGE_RT_UNLOCK(sc);
2791 			return (ENOSPC);
2792 		}
2793 		/* Check per interface address limits (if enabled) */
2794 		if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2795 			bif->bif_addrexceeded++;
2796 			BRIDGE_RT_UNLOCK(sc);
2797 			return (ENOSPC);
2798 		}
2799 
2800 		/*
2801 		 * Allocate a new bridge forwarding node, and
2802 		 * initialize the expiration time and Ethernet
2803 		 * address.
2804 		 */
2805 		brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2806 		if (brt == NULL) {
2807 			BRIDGE_RT_UNLOCK(sc);
2808 			return (ENOMEM);
2809 		}
2810 		brt->brt_vnet = curvnet;
2811 
2812 		if (bif->bif_flags & IFBIF_STICKY)
2813 			brt->brt_flags = IFBAF_STICKY;
2814 		else
2815 			brt->brt_flags = IFBAF_DYNAMIC;
2816 
2817 		memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2818 		brt->brt_vlan = vlan;
2819 
2820 		if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2821 			uma_zfree(V_bridge_rtnode_zone, brt);
2822 			BRIDGE_RT_UNLOCK(sc);
2823 			return (error);
2824 		}
2825 		brt->brt_dst = bif;
2826 		bif->bif_addrcnt++;
2827 
2828 		BRIDGE_RT_UNLOCK(sc);
2829 	}
2830 
2831 	if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2832 	    brt->brt_dst != bif) {
2833 		BRIDGE_RT_LOCK(sc);
2834 		brt->brt_dst->bif_addrcnt--;
2835 		brt->brt_dst = bif;
2836 		brt->brt_dst->bif_addrcnt++;
2837 		BRIDGE_RT_UNLOCK(sc);
2838 	}
2839 
2840 	if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2841 		brt->brt_expire = time_uptime + sc->sc_brttimeout;
2842 	if (setflags)
2843 		brt->brt_flags = flags;
2844 
2845 	return (0);
2846 }
2847 
2848 /*
2849  * bridge_rtlookup:
2850  *
2851  *	Lookup the destination interface for an address.
2852  */
2853 static struct ifnet *
2854 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2855 {
2856 	struct bridge_rtnode *brt;
2857 
2858 	NET_EPOCH_ASSERT();
2859 
2860 	if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2861 		return (NULL);
2862 
2863 	return (brt->brt_ifp);
2864 }
2865 
2866 /*
2867  * bridge_rttrim:
2868  *
2869  *	Trim the routine table so that we have a number
2870  *	of routing entries less than or equal to the
2871  *	maximum number.
2872  */
2873 static void
2874 bridge_rttrim(struct bridge_softc *sc)
2875 {
2876 	struct bridge_rtnode *brt, *nbrt;
2877 
2878 	NET_EPOCH_ASSERT();
2879 	BRIDGE_RT_LOCK_ASSERT(sc);
2880 
2881 	/* Make sure we actually need to do this. */
2882 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2883 		return;
2884 
2885 	/* Force an aging cycle; this might trim enough addresses. */
2886 	bridge_rtage(sc);
2887 	if (sc->sc_brtcnt <= sc->sc_brtmax)
2888 		return;
2889 
2890 	CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2891 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2892 			bridge_rtnode_destroy(sc, brt);
2893 			if (sc->sc_brtcnt <= sc->sc_brtmax)
2894 				return;
2895 		}
2896 	}
2897 }
2898 
2899 /*
2900  * bridge_timer:
2901  *
2902  *	Aging timer for the bridge.
2903  */
2904 static void
2905 bridge_timer(void *arg)
2906 {
2907 	struct bridge_softc *sc = arg;
2908 
2909 	BRIDGE_RT_LOCK_ASSERT(sc);
2910 
2911 	/* Destruction of rtnodes requires a proper vnet context */
2912 	CURVNET_SET(sc->sc_ifp->if_vnet);
2913 	bridge_rtage(sc);
2914 
2915 	if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2916 		callout_reset(&sc->sc_brcallout,
2917 		    bridge_rtable_prune_period * hz, bridge_timer, sc);
2918 	CURVNET_RESTORE();
2919 }
2920 
2921 /*
2922  * bridge_rtage:
2923  *
2924  *	Perform an aging cycle.
2925  */
2926 static void
2927 bridge_rtage(struct bridge_softc *sc)
2928 {
2929 	struct bridge_rtnode *brt, *nbrt;
2930 
2931 	BRIDGE_RT_LOCK_ASSERT(sc);
2932 
2933 	CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2934 		if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2935 			if (time_uptime >= brt->brt_expire)
2936 				bridge_rtnode_destroy(sc, brt);
2937 		}
2938 	}
2939 }
2940 
2941 /*
2942  * bridge_rtflush:
2943  *
2944  *	Remove all dynamic addresses from the bridge.
2945  */
2946 static void
2947 bridge_rtflush(struct bridge_softc *sc, int full)
2948 {
2949 	struct bridge_rtnode *brt, *nbrt;
2950 
2951 	BRIDGE_RT_LOCK_ASSERT(sc);
2952 
2953 	CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2954 		if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2955 			bridge_rtnode_destroy(sc, brt);
2956 	}
2957 }
2958 
2959 /*
2960  * bridge_rtdaddr:
2961  *
2962  *	Remove an address from the table.
2963  */
2964 static int
2965 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2966 {
2967 	struct bridge_rtnode *brt;
2968 	int found = 0;
2969 
2970 	BRIDGE_RT_LOCK(sc);
2971 
2972 	/*
2973 	 * If vlan is zero then we want to delete for all vlans so the lookup
2974 	 * may return more than one.
2975 	 */
2976 	while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2977 		bridge_rtnode_destroy(sc, brt);
2978 		found = 1;
2979 	}
2980 
2981 	BRIDGE_RT_UNLOCK(sc);
2982 
2983 	return (found ? 0 : ENOENT);
2984 }
2985 
2986 /*
2987  * bridge_rtdelete:
2988  *
2989  *	Delete routes to a speicifc member interface.
2990  */
2991 static void
2992 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2993 {
2994 	struct bridge_rtnode *brt, *nbrt;
2995 
2996 	BRIDGE_RT_LOCK_ASSERT(sc);
2997 
2998 	CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2999 		if (brt->brt_ifp == ifp && (full ||
3000 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
3001 			bridge_rtnode_destroy(sc, brt);
3002 	}
3003 }
3004 
3005 /*
3006  * bridge_rtable_init:
3007  *
3008  *	Initialize the route table for this bridge.
3009  */
3010 static void
3011 bridge_rtable_init(struct bridge_softc *sc)
3012 {
3013 	int i;
3014 
3015 	sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
3016 	    M_DEVBUF, M_WAITOK);
3017 
3018 	for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3019 		CK_LIST_INIT(&sc->sc_rthash[i]);
3020 
3021 	sc->sc_rthash_key = arc4random();
3022 	CK_LIST_INIT(&sc->sc_rtlist);
3023 }
3024 
3025 /*
3026  * bridge_rtable_fini:
3027  *
3028  *	Deconstruct the route table for this bridge.
3029  */
3030 static void
3031 bridge_rtable_fini(struct bridge_softc *sc)
3032 {
3033 
3034 	KASSERT(sc->sc_brtcnt == 0,
3035 	    ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
3036 	free(sc->sc_rthash, M_DEVBUF);
3037 }
3038 
3039 /*
3040  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3041  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3042  */
3043 #define	mix(a, b, c)							\
3044 do {									\
3045 	a -= b; a -= c; a ^= (c >> 13);					\
3046 	b -= c; b -= a; b ^= (a << 8);					\
3047 	c -= a; c -= b; c ^= (b >> 13);					\
3048 	a -= b; a -= c; a ^= (c >> 12);					\
3049 	b -= c; b -= a; b ^= (a << 16);					\
3050 	c -= a; c -= b; c ^= (b >> 5);					\
3051 	a -= b; a -= c; a ^= (c >> 3);					\
3052 	b -= c; b -= a; b ^= (a << 10);					\
3053 	c -= a; c -= b; c ^= (b >> 15);					\
3054 } while (/*CONSTCOND*/0)
3055 
3056 static __inline uint32_t
3057 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3058 {
3059 	uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3060 
3061 	b += addr[5] << 8;
3062 	b += addr[4];
3063 	a += addr[3] << 24;
3064 	a += addr[2] << 16;
3065 	a += addr[1] << 8;
3066 	a += addr[0];
3067 
3068 	mix(a, b, c);
3069 
3070 	return (c & BRIDGE_RTHASH_MASK);
3071 }
3072 
3073 #undef mix
3074 
3075 static int
3076 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3077 {
3078 	int i, d;
3079 
3080 	for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3081 		d = ((int)a[i]) - ((int)b[i]);
3082 	}
3083 
3084 	return (d);
3085 }
3086 
3087 /*
3088  * bridge_rtnode_lookup:
3089  *
3090  *	Look up a bridge route node for the specified destination. Compare the
3091  *	vlan id or if zero then just return the first match.
3092  */
3093 static struct bridge_rtnode *
3094 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3095 {
3096 	struct bridge_rtnode *brt;
3097 	uint32_t hash;
3098 	int dir;
3099 
3100 	BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc);
3101 
3102 	hash = bridge_rthash(sc, addr);
3103 	CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3104 		dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3105 		if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
3106 			return (brt);
3107 		if (dir > 0)
3108 			return (NULL);
3109 	}
3110 
3111 	return (NULL);
3112 }
3113 
3114 /*
3115  * bridge_rtnode_insert:
3116  *
3117  *	Insert the specified bridge node into the route table.  We
3118  *	assume the entry is not already in the table.
3119  */
3120 static int
3121 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3122 {
3123 	struct bridge_rtnode *lbrt;
3124 	uint32_t hash;
3125 	int dir;
3126 
3127 	BRIDGE_RT_LOCK_ASSERT(sc);
3128 
3129 	hash = bridge_rthash(sc, brt->brt_addr);
3130 
3131 	lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3132 	if (lbrt == NULL) {
3133 		CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3134 		goto out;
3135 	}
3136 
3137 	do {
3138 		dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3139 		if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3140 			return (EEXIST);
3141 		if (dir > 0) {
3142 			CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3143 			goto out;
3144 		}
3145 		if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3146 			CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3147 			goto out;
3148 		}
3149 		lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3150 	} while (lbrt != NULL);
3151 
3152 #ifdef DIAGNOSTIC
3153 	panic("bridge_rtnode_insert: impossible");
3154 #endif
3155 
3156 out:
3157 	CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3158 	sc->sc_brtcnt++;
3159 
3160 	return (0);
3161 }
3162 
3163 static void
3164 bridge_rtnode_destroy_cb(struct epoch_context *ctx)
3165 {
3166 	struct bridge_rtnode *brt;
3167 
3168 	brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx);
3169 
3170 	CURVNET_SET(brt->brt_vnet);
3171 	uma_zfree(V_bridge_rtnode_zone, brt);
3172 	CURVNET_RESTORE();
3173 }
3174 
3175 /*
3176  * bridge_rtnode_destroy:
3177  *
3178  *	Destroy a bridge rtnode.
3179  */
3180 static void
3181 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3182 {
3183 	BRIDGE_RT_LOCK_ASSERT(sc);
3184 
3185 	CK_LIST_REMOVE(brt, brt_hash);
3186 
3187 	CK_LIST_REMOVE(brt, brt_list);
3188 	sc->sc_brtcnt--;
3189 	brt->brt_dst->bif_addrcnt--;
3190 
3191 	NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx);
3192 }
3193 
3194 /*
3195  * bridge_rtable_expire:
3196  *
3197  *	Set the expiry time for all routes on an interface.
3198  */
3199 static void
3200 bridge_rtable_expire(struct ifnet *ifp, int age)
3201 {
3202 	struct bridge_softc *sc = ifp->if_bridge;
3203 	struct bridge_rtnode *brt;
3204 
3205 	CURVNET_SET(ifp->if_vnet);
3206 	BRIDGE_RT_LOCK(sc);
3207 
3208 	/*
3209 	 * If the age is zero then flush, otherwise set all the expiry times to
3210 	 * age for the interface
3211 	 */
3212 	if (age == 0)
3213 		bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3214 	else {
3215 		CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3216 			/* Cap the expiry time to 'age' */
3217 			if (brt->brt_ifp == ifp &&
3218 			    brt->brt_expire > time_uptime + age &&
3219 			    (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3220 				brt->brt_expire = time_uptime + age;
3221 		}
3222 	}
3223 	BRIDGE_RT_UNLOCK(sc);
3224 	CURVNET_RESTORE();
3225 }
3226 
3227 /*
3228  * bridge_state_change:
3229  *
3230  *	Callback from the bridgestp code when a port changes states.
3231  */
3232 static void
3233 bridge_state_change(struct ifnet *ifp, int state)
3234 {
3235 	struct bridge_softc *sc = ifp->if_bridge;
3236 	static const char *stpstates[] = {
3237 		"disabled",
3238 		"listening",
3239 		"learning",
3240 		"forwarding",
3241 		"blocking",
3242 		"discarding"
3243 	};
3244 
3245 	CURVNET_SET(ifp->if_vnet);
3246 	if (V_log_stp)
3247 		log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3248 		    sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3249 	CURVNET_RESTORE();
3250 }
3251 
3252 /*
3253  * Send bridge packets through pfil if they are one of the types pfil can deal
3254  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3255  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3256  * that interface.
3257  */
3258 static int
3259 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3260 {
3261 	int snap, error, i, hlen;
3262 	struct ether_header *eh1, eh2;
3263 	struct ip *ip;
3264 	struct llc llc1;
3265 	u_int16_t ether_type;
3266 	pfil_return_t rv;
3267 
3268 	snap = 0;
3269 	error = -1;	/* Default error if not error == 0 */
3270 
3271 #if 0
3272 	/* we may return with the IP fields swapped, ensure its not shared */
3273 	KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3274 #endif
3275 
3276 	if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3277 		return (0); /* filtering is disabled */
3278 
3279 	i = min((*mp)->m_pkthdr.len, max_protohdr);
3280 	if ((*mp)->m_len < i) {
3281 	    *mp = m_pullup(*mp, i);
3282 	    if (*mp == NULL) {
3283 		printf("%s: m_pullup failed\n", __func__);
3284 		return (-1);
3285 	    }
3286 	}
3287 
3288 	eh1 = mtod(*mp, struct ether_header *);
3289 	ether_type = ntohs(eh1->ether_type);
3290 
3291 	/*
3292 	 * Check for SNAP/LLC.
3293 	 */
3294 	if (ether_type < ETHERMTU) {
3295 		struct llc *llc2 = (struct llc *)(eh1 + 1);
3296 
3297 		if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3298 		    llc2->llc_dsap == LLC_SNAP_LSAP &&
3299 		    llc2->llc_ssap == LLC_SNAP_LSAP &&
3300 		    llc2->llc_control == LLC_UI) {
3301 			ether_type = htons(llc2->llc_un.type_snap.ether_type);
3302 			snap = 1;
3303 		}
3304 	}
3305 
3306 	/*
3307 	 * If we're trying to filter bridge traffic, don't look at anything
3308 	 * other than IP and ARP traffic.  If the filter doesn't understand
3309 	 * IPv6, don't allow IPv6 through the bridge either.  This is lame
3310 	 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3311 	 * but of course we don't have an AppleTalk filter to begin with.
3312 	 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3313 	 * ARP traffic.)
3314 	 */
3315 	switch (ether_type) {
3316 		case ETHERTYPE_ARP:
3317 		case ETHERTYPE_REVARP:
3318 			if (V_pfil_ipfw_arp == 0)
3319 				return (0); /* Automatically pass */
3320 			break;
3321 
3322 		case ETHERTYPE_IP:
3323 #ifdef INET6
3324 		case ETHERTYPE_IPV6:
3325 #endif /* INET6 */
3326 			break;
3327 		default:
3328 			/*
3329 			 * Check to see if the user wants to pass non-ip
3330 			 * packets, these will not be checked by pfil(9) and
3331 			 * passed unconditionally so the default is to drop.
3332 			 */
3333 			if (V_pfil_onlyip)
3334 				goto bad;
3335 	}
3336 
3337 	/* Run the packet through pfil before stripping link headers */
3338 	if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3339 	    dir == PFIL_OUT && ifp != NULL) {
3340 		switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3341 		case PFIL_DROPPED:
3342 			return (EACCES);
3343 		case PFIL_CONSUMED:
3344 			return (0);
3345 		}
3346 	}
3347 
3348 	/* Strip off the Ethernet header and keep a copy. */
3349 	m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3350 	m_adj(*mp, ETHER_HDR_LEN);
3351 
3352 	/* Strip off snap header, if present */
3353 	if (snap) {
3354 		m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3355 		m_adj(*mp, sizeof(struct llc));
3356 	}
3357 
3358 	/*
3359 	 * Check the IP header for alignment and errors
3360 	 */
3361 	if (dir == PFIL_IN) {
3362 		switch (ether_type) {
3363 			case ETHERTYPE_IP:
3364 				error = bridge_ip_checkbasic(mp);
3365 				break;
3366 #ifdef INET6
3367 			case ETHERTYPE_IPV6:
3368 				error = bridge_ip6_checkbasic(mp);
3369 				break;
3370 #endif /* INET6 */
3371 			default:
3372 				error = 0;
3373 		}
3374 		if (error)
3375 			goto bad;
3376 	}
3377 
3378 	error = 0;
3379 
3380 	/*
3381 	 * Run the packet through pfil
3382 	 */
3383 	rv = PFIL_PASS;
3384 	switch (ether_type) {
3385 	case ETHERTYPE_IP:
3386 		/*
3387 		 * Run pfil on the member interface and the bridge, both can
3388 		 * be skipped by clearing pfil_member or pfil_bridge.
3389 		 *
3390 		 * Keep the order:
3391 		 *   in_if -> bridge_if -> out_if
3392 		 */
3393 		if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3394 		    pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3395 		    PFIL_PASS)
3396 			break;
3397 
3398 		if (V_pfil_member && ifp != NULL && (rv =
3399 		    pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3400 		    PFIL_PASS)
3401 			break;
3402 
3403 		if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3404 		    pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3405 		    PFIL_PASS)
3406 			break;
3407 
3408 		/* check if we need to fragment the packet */
3409 		/* bridge_fragment generates a mbuf chain of packets */
3410 		/* that already include eth headers */
3411 		if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3412 			i = (*mp)->m_pkthdr.len;
3413 			if (i > ifp->if_mtu) {
3414 				error = bridge_fragment(ifp, mp, &eh2, snap,
3415 					    &llc1);
3416 				return (error);
3417 			}
3418 		}
3419 
3420 		/* Recalculate the ip checksum. */
3421 		ip = mtod(*mp, struct ip *);
3422 		hlen = ip->ip_hl << 2;
3423 		if (hlen < sizeof(struct ip))
3424 			goto bad;
3425 		if (hlen > (*mp)->m_len) {
3426 			if ((*mp = m_pullup(*mp, hlen)) == NULL)
3427 				goto bad;
3428 			ip = mtod(*mp, struct ip *);
3429 			if (ip == NULL)
3430 				goto bad;
3431 		}
3432 		ip->ip_sum = 0;
3433 		if (hlen == sizeof(struct ip))
3434 			ip->ip_sum = in_cksum_hdr(ip);
3435 		else
3436 			ip->ip_sum = in_cksum(*mp, hlen);
3437 
3438 		break;
3439 #ifdef INET6
3440 	case ETHERTYPE_IPV6:
3441 		if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3442 		    pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3443 		    PFIL_PASS)
3444 			break;
3445 
3446 		if (V_pfil_member && ifp != NULL && (rv =
3447 		    pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3448 		    PFIL_PASS)
3449 			break;
3450 
3451 		if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3452 		    pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3453 		    PFIL_PASS)
3454 			break;
3455 		break;
3456 #endif
3457 	}
3458 
3459 	switch (rv) {
3460 	case PFIL_CONSUMED:
3461 		return (0);
3462 	case PFIL_DROPPED:
3463 		return (EACCES);
3464 	default:
3465 		break;
3466 	}
3467 
3468 	error = -1;
3469 
3470 	/*
3471 	 * Finally, put everything back the way it was and return
3472 	 */
3473 	if (snap) {
3474 		M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3475 		if (*mp == NULL)
3476 			return (error);
3477 		bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3478 	}
3479 
3480 	M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3481 	if (*mp == NULL)
3482 		return (error);
3483 	bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3484 
3485 	return (0);
3486 
3487 bad:
3488 	m_freem(*mp);
3489 	*mp = NULL;
3490 	return (error);
3491 }
3492 
3493 /*
3494  * Perform basic checks on header size since
3495  * pfil assumes ip_input has already processed
3496  * it for it.  Cut-and-pasted from ip_input.c.
3497  * Given how simple the IPv6 version is,
3498  * does the IPv4 version really need to be
3499  * this complicated?
3500  *
3501  * XXX Should we update ipstat here, or not?
3502  * XXX Right now we update ipstat but not
3503  * XXX csum_counter.
3504  */
3505 static int
3506 bridge_ip_checkbasic(struct mbuf **mp)
3507 {
3508 	struct mbuf *m = *mp;
3509 	struct ip *ip;
3510 	int len, hlen;
3511 	u_short sum;
3512 
3513 	if (*mp == NULL)
3514 		return (-1);
3515 
3516 	if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3517 		if ((m = m_copyup(m, sizeof(struct ip),
3518 			(max_linkhdr + 3) & ~3)) == NULL) {
3519 			/* XXXJRT new stat, please */
3520 			KMOD_IPSTAT_INC(ips_toosmall);
3521 			goto bad;
3522 		}
3523 	} else if (__predict_false(m->m_len < sizeof (struct ip))) {
3524 		if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3525 			KMOD_IPSTAT_INC(ips_toosmall);
3526 			goto bad;
3527 		}
3528 	}
3529 	ip = mtod(m, struct ip *);
3530 	if (ip == NULL) goto bad;
3531 
3532 	if (ip->ip_v != IPVERSION) {
3533 		KMOD_IPSTAT_INC(ips_badvers);
3534 		goto bad;
3535 	}
3536 	hlen = ip->ip_hl << 2;
3537 	if (hlen < sizeof(struct ip)) { /* minimum header length */
3538 		KMOD_IPSTAT_INC(ips_badhlen);
3539 		goto bad;
3540 	}
3541 	if (hlen > m->m_len) {
3542 		if ((m = m_pullup(m, hlen)) == NULL) {
3543 			KMOD_IPSTAT_INC(ips_badhlen);
3544 			goto bad;
3545 		}
3546 		ip = mtod(m, struct ip *);
3547 		if (ip == NULL) goto bad;
3548 	}
3549 
3550 	if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3551 		sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3552 	} else {
3553 		if (hlen == sizeof(struct ip)) {
3554 			sum = in_cksum_hdr(ip);
3555 		} else {
3556 			sum = in_cksum(m, hlen);
3557 		}
3558 	}
3559 	if (sum) {
3560 		KMOD_IPSTAT_INC(ips_badsum);
3561 		goto bad;
3562 	}
3563 
3564 	/* Retrieve the packet length. */
3565 	len = ntohs(ip->ip_len);
3566 
3567 	/*
3568 	 * Check for additional length bogosity
3569 	 */
3570 	if (len < hlen) {
3571 		KMOD_IPSTAT_INC(ips_badlen);
3572 		goto bad;
3573 	}
3574 
3575 	/*
3576 	 * Check that the amount of data in the buffers
3577 	 * is as at least much as the IP header would have us expect.
3578 	 * Drop packet if shorter than we expect.
3579 	 */
3580 	if (m->m_pkthdr.len < len) {
3581 		KMOD_IPSTAT_INC(ips_tooshort);
3582 		goto bad;
3583 	}
3584 
3585 	/* Checks out, proceed */
3586 	*mp = m;
3587 	return (0);
3588 
3589 bad:
3590 	*mp = m;
3591 	return (-1);
3592 }
3593 
3594 #ifdef INET6
3595 /*
3596  * Same as above, but for IPv6.
3597  * Cut-and-pasted from ip6_input.c.
3598  * XXX Should we update ip6stat, or not?
3599  */
3600 static int
3601 bridge_ip6_checkbasic(struct mbuf **mp)
3602 {
3603 	struct mbuf *m = *mp;
3604 	struct ip6_hdr *ip6;
3605 
3606 	/*
3607 	 * If the IPv6 header is not aligned, slurp it up into a new
3608 	 * mbuf with space for link headers, in the event we forward
3609 	 * it.  Otherwise, if it is aligned, make sure the entire base
3610 	 * IPv6 header is in the first mbuf of the chain.
3611 	 */
3612 	if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3613 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3614 		if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3615 			    (max_linkhdr + 3) & ~3)) == NULL) {
3616 			/* XXXJRT new stat, please */
3617 			IP6STAT_INC(ip6s_toosmall);
3618 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3619 			goto bad;
3620 		}
3621 	} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3622 		struct ifnet *inifp = m->m_pkthdr.rcvif;
3623 		if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3624 			IP6STAT_INC(ip6s_toosmall);
3625 			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3626 			goto bad;
3627 		}
3628 	}
3629 
3630 	ip6 = mtod(m, struct ip6_hdr *);
3631 
3632 	if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3633 		IP6STAT_INC(ip6s_badvers);
3634 		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3635 		goto bad;
3636 	}
3637 
3638 	/* Checks out, proceed */
3639 	*mp = m;
3640 	return (0);
3641 
3642 bad:
3643 	*mp = m;
3644 	return (-1);
3645 }
3646 #endif /* INET6 */
3647 
3648 /*
3649  * bridge_fragment:
3650  *
3651  *	Fragment mbuf chain in multiple packets and prepend ethernet header.
3652  */
3653 static int
3654 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3655     int snap, struct llc *llc)
3656 {
3657 	struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3658 	struct ip *ip;
3659 	int error = -1;
3660 
3661 	if (m->m_len < sizeof(struct ip) &&
3662 	    (m = m_pullup(m, sizeof(struct ip))) == NULL)
3663 		goto dropit;
3664 	ip = mtod(m, struct ip *);
3665 
3666 	m->m_pkthdr.csum_flags |= CSUM_IP;
3667 	error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3668 	if (error)
3669 		goto dropit;
3670 
3671 	/*
3672 	 * Walk the chain and re-add the Ethernet header for
3673 	 * each mbuf packet.
3674 	 */
3675 	for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3676 		nextpkt = mcur->m_nextpkt;
3677 		mcur->m_nextpkt = NULL;
3678 		if (snap) {
3679 			M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3680 			if (mcur == NULL) {
3681 				error = ENOBUFS;
3682 				if (mprev != NULL)
3683 					mprev->m_nextpkt = nextpkt;
3684 				goto dropit;
3685 			}
3686 			bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3687 		}
3688 
3689 		M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3690 		if (mcur == NULL) {
3691 			error = ENOBUFS;
3692 			if (mprev != NULL)
3693 				mprev->m_nextpkt = nextpkt;
3694 			goto dropit;
3695 		}
3696 		bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3697 
3698 		/*
3699 		 * The previous two M_PREPEND could have inserted one or two
3700 		 * mbufs in front so we have to update the previous packet's
3701 		 * m_nextpkt.
3702 		 */
3703 		mcur->m_nextpkt = nextpkt;
3704 		if (mprev != NULL)
3705 			mprev->m_nextpkt = mcur;
3706 		else {
3707 			/* The first mbuf in the original chain needs to be
3708 			 * updated. */
3709 			*mp = mcur;
3710 		}
3711 		mprev = mcur;
3712 	}
3713 
3714 	KMOD_IPSTAT_INC(ips_fragmented);
3715 	return (error);
3716 
3717 dropit:
3718 	for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3719 		m = mcur->m_nextpkt;
3720 		m_freem(mcur);
3721 	}
3722 	return (error);
3723 }
3724 
3725 static void
3726 bridge_linkstate(struct ifnet *ifp)
3727 {
3728 	struct bridge_softc *sc = ifp->if_bridge;
3729 	struct bridge_iflist *bif;
3730 	struct epoch_tracker et;
3731 
3732 	NET_EPOCH_ENTER(et);
3733 
3734 	bif = bridge_lookup_member_if(sc, ifp);
3735 	if (bif == NULL) {
3736 		NET_EPOCH_EXIT(et);
3737 		return;
3738 	}
3739 	bridge_linkcheck(sc);
3740 
3741 	bstp_linkstate(&bif->bif_stp);
3742 
3743 	NET_EPOCH_EXIT(et);
3744 }
3745 
3746 static void
3747 bridge_linkcheck(struct bridge_softc *sc)
3748 {
3749 	struct bridge_iflist *bif;
3750 	int new_link, hasls;
3751 
3752 	BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
3753 
3754 	new_link = LINK_STATE_DOWN;
3755 	hasls = 0;
3756 	/* Our link is considered up if at least one of our ports is active */
3757 	CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3758 		if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3759 			hasls++;
3760 		if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3761 			new_link = LINK_STATE_UP;
3762 			break;
3763 		}
3764 	}
3765 	if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3766 		/* If no interfaces support link-state then we default to up */
3767 		new_link = LINK_STATE_UP;
3768 	}
3769 	if_link_state_change(sc->sc_ifp, new_link);
3770 }
3771