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