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ed(1): simplify by using arc4random_buf().
[freebsd-src.git] / sys / net / if_bridge.c
blob4fe5e67b9fb7286ee45706685abfc54caec67427
1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*
4 * Copyright 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
40 * All rights reserved.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
61 * POSSIBILITY OF SUCH DAMAGE.
62 *
63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
64 */
65
66 /*
67 * Network interface bridge support.
68 *
69 * TODO:
70 *
71 * - Currently only supports Ethernet-like interfaces (Ethernet,
72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
73 * to bridge other types of interfaces (FDDI-FDDI, and maybe
74 * consider heterogeneous bridges).
75 */
76
77 #include <sys/cdefs.h>
78 __FBSDID("$FreeBSD$");
79
80 #include "opt_inet.h"
81 #include "opt_inet6.h"
82
83 #include <sys/param.h>
84 #include <sys/eventhandler.h>
85 #include <sys/mbuf.h>
86 #include <sys/malloc.h>
87 #include <sys/protosw.h>
88 #include <sys/systm.h>
89 #include <sys/jail.h>
90 #include <sys/time.h>
91 #include <sys/socket.h> /* for net/if.h */
92 #include <sys/sockio.h>
93 #include <sys/ctype.h> /* string functions */
94 #include <sys/kernel.h>
95 #include <sys/random.h>
96 #include <sys/syslog.h>
97 #include <sys/sysctl.h>
98 #include <vm/uma.h>
99 #include <sys/module.h>
100 #include <sys/priv.h>
101 #include <sys/proc.h>
102 #include <sys/lock.h>
103 #include <sys/mutex.h>
104
105 #include <net/bpf.h>
106 #include <net/if.h>
107 #include <net/if_clone.h>
108 #include <net/if_dl.h>
109 #include <net/if_types.h>
110 #include <net/if_var.h>
111 #include <net/pfil.h>
112 #include <net/vnet.h>
113
114 #include <netinet/in.h>
115 #include <netinet/in_systm.h>
116 #include <netinet/in_var.h>
117 #include <netinet/ip.h>
118 #include <netinet/ip_var.h>
119 #ifdef INET6
120 #include <netinet/ip6.h>
121 #include <netinet6/ip6_var.h>
122 #include <netinet6/in6_ifattach.h>
123 #endif
124 #if defined(INET) || defined(INET6)
125 #include <netinet/ip_carp.h>
126 #endif
127 #include <machine/in_cksum.h>
128 #include <netinet/if_ether.h>
129 #include <net/bridgestp.h>
130 #include <net/if_bridgevar.h>
131 #include <net/if_llc.h>
132 #include <net/if_vlan_var.h>
133
134 #include <net/route.h>
135
136 /*
137 * Size of the route hash table. Must be a power of two.
138 */
139 #ifndef BRIDGE_RTHASH_SIZE
140 #define BRIDGE_RTHASH_SIZE 1024
141 #endif
142
143 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
144
145 /*
146 * Default maximum number of addresses to cache.
147 */
148 #ifndef BRIDGE_RTABLE_MAX
149 #define BRIDGE_RTABLE_MAX 2000
150 #endif
151
152 /*
153 * Timeout (in seconds) for entries learned dynamically.
154 */
155 #ifndef BRIDGE_RTABLE_TIMEOUT
156 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
157 #endif
158
159 /*
160 * Number of seconds between walks of the route list.
161 */
162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
163 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
164 #endif
165
166 /*
167 * List of capabilities to possibly mask on the member interface.
168 */
169 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
170
171 /*
172 * List of capabilities to strip
173 */
174 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
175
176 /*
177 * Bridge interface list entry.
178 */
179 struct bridge_iflist {
180 LIST_ENTRY(bridge_iflist) bif_next;
181 struct ifnet *bif_ifp; /* member if */
182 struct bstp_port bif_stp; /* STP state */
183 uint32_t bif_flags; /* member if flags */
184 int bif_savedcaps; /* saved capabilities */
185 uint32_t bif_addrmax; /* max # of addresses */
186 uint32_t bif_addrcnt; /* cur. # of addresses */
187 uint32_t bif_addrexceeded;/* # of address violations */
188 };
189
190 /*
191 * Bridge route node.
192 */
193 struct bridge_rtnode {
194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
196 struct bridge_iflist *brt_dst; /* destination if */
197 unsigned long brt_expire; /* expiration time */
198 uint8_t brt_flags; /* address flags */
199 uint8_t brt_addr[ETHER_ADDR_LEN];
200 uint16_t brt_vlan; /* vlan id */
201 };
202 #define brt_ifp brt_dst->bif_ifp
203
204 /*
205 * Software state for each bridge.
206 */
207 struct bridge_softc {
208 struct ifnet *sc_ifp; /* make this an interface */
209 LIST_ENTRY(bridge_softc) sc_list;
210 struct mtx sc_mtx;
211 struct cv sc_cv;
212 uint32_t sc_brtmax; /* max # of addresses */
213 uint32_t sc_brtcnt; /* cur. # of addresses */
214 uint32_t sc_brttimeout; /* rt timeout in seconds */
215 struct callout sc_brcallout; /* bridge callout */
216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
221 uint32_t sc_rthash_key; /* key for hash */
222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
223 struct bstp_state sc_stp; /* STP state */
224 uint32_t sc_brtexceeded; /* # of cache drops */
225 struct ifnet *sc_ifaddr; /* member mac copied from */
226 u_char sc_defaddr[6]; /* Default MAC address */
227 };
228
229 static VNET_DEFINE(struct mtx, bridge_list_mtx);
230 #define V_bridge_list_mtx VNET(bridge_list_mtx)
231 static eventhandler_tag bridge_detach_cookie;
232
233 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
234
235 uma_zone_t bridge_rtnode_zone;
236
237 static int bridge_clone_create(struct if_clone *, int, caddr_t);
238 static void bridge_clone_destroy(struct ifnet *);
239
240 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
241 static void bridge_mutecaps(struct bridge_softc *);
242 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
243 int);
244 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
245 static void bridge_init(void *);
246 static void bridge_dummynet(struct mbuf *, struct ifnet *);
247 static void bridge_stop(struct ifnet *, int);
248 static int bridge_transmit(struct ifnet *, struct mbuf *);
249 static void bridge_qflush(struct ifnet *);
250 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
251 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
252 struct rtentry *);
253 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
254 struct mbuf *);
255 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
256
257 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
258 struct mbuf *m);
259
260 static void bridge_timer(void *);
261
262 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
263 struct mbuf *, int);
264 static void bridge_span(struct bridge_softc *, struct mbuf *);
265
266 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
267 uint16_t, struct bridge_iflist *, int, uint8_t);
268 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
269 uint16_t);
270 static void bridge_rttrim(struct bridge_softc *);
271 static void bridge_rtage(struct bridge_softc *);
272 static void bridge_rtflush(struct bridge_softc *, int);
273 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
274 uint16_t);
275
276 static void bridge_rtable_init(struct bridge_softc *);
277 static void bridge_rtable_fini(struct bridge_softc *);
278
279 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
280 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
281 const uint8_t *, uint16_t);
282 static int bridge_rtnode_insert(struct bridge_softc *,
283 struct bridge_rtnode *);
284 static void bridge_rtnode_destroy(struct bridge_softc *,
285 struct bridge_rtnode *);
286 static void bridge_rtable_expire(struct ifnet *, int);
287 static void bridge_state_change(struct ifnet *, int);
288
289 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
290 const char *name);
291 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
292 struct ifnet *ifp);
293 static void bridge_delete_member(struct bridge_softc *,
294 struct bridge_iflist *, int);
295 static void bridge_delete_span(struct bridge_softc *,
296 struct bridge_iflist *);
297
298 static int bridge_ioctl_add(struct bridge_softc *, void *);
299 static int bridge_ioctl_del(struct bridge_softc *, void *);
300 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
301 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
302 static int bridge_ioctl_scache(struct bridge_softc *, void *);
303 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
304 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
305 static int bridge_ioctl_rts(struct bridge_softc *, void *);
306 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
307 static int bridge_ioctl_sto(struct bridge_softc *, void *);
308 static int bridge_ioctl_gto(struct bridge_softc *, void *);
309 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
310 static int bridge_ioctl_flush(struct bridge_softc *, void *);
311 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
312 static int bridge_ioctl_spri(struct bridge_softc *, void *);
313 static int bridge_ioctl_ght(struct bridge_softc *, void *);
314 static int bridge_ioctl_sht(struct bridge_softc *, void *);
315 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
316 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
317 static int bridge_ioctl_gma(struct bridge_softc *, void *);
318 static int bridge_ioctl_sma(struct bridge_softc *, void *);
319 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
320 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
321 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
322 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
323 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
324 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
325 static int bridge_ioctl_grte(struct bridge_softc *, void *);
326 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
327 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
328 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
329 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
330 int);
331 static int bridge_ip_checkbasic(struct mbuf **mp);
332 #ifdef INET6
333 static int bridge_ip6_checkbasic(struct mbuf **mp);
334 #endif /* INET6 */
335 static int bridge_fragment(struct ifnet *, struct mbuf *,
336 struct ether_header *, int, struct llc *);
337 static void bridge_linkstate(struct ifnet *ifp);
338 static void bridge_linkcheck(struct bridge_softc *sc);
339
340 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
341
342 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
343 #define VLANTAGOF(_m) \
344 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
345
346 static struct bstp_cb_ops bridge_ops = {
347 .bcb_state = bridge_state_change,
348 .bcb_rtage = bridge_rtable_expire
349 };
350
351 SYSCTL_DECL(_net_link);
352 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
353
354 /* only pass IP[46] packets when pfil is enabled */
355 static VNET_DEFINE(int, pfil_onlyip) = 1;
356 #define V_pfil_onlyip VNET(pfil_onlyip)
357 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
358 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
359 "Only pass IP packets when pfil is enabled");
360
361 /* run pfil hooks on the bridge interface */
362 static VNET_DEFINE(int, pfil_bridge) = 1;
363 #define V_pfil_bridge VNET(pfil_bridge)
364 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
365 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
366 "Packet filter on the bridge interface");
367
368 /* layer2 filter with ipfw */
369 static VNET_DEFINE(int, pfil_ipfw);
370 #define V_pfil_ipfw VNET(pfil_ipfw)
371
372 /* layer2 ARP filter with ipfw */
373 static VNET_DEFINE(int, pfil_ipfw_arp);
374 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
375 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
376 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
377 "Filter ARP packets through IPFW layer2");
378
379 /* run pfil hooks on the member interface */
380 static VNET_DEFINE(int, pfil_member) = 1;
381 #define V_pfil_member VNET(pfil_member)
382 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
383 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
384 "Packet filter on the member interface");
385
386 /* run pfil hooks on the physical interface for locally destined packets */
387 static VNET_DEFINE(int, pfil_local_phys);
388 #define V_pfil_local_phys VNET(pfil_local_phys)
389 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
390 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
391 "Packet filter on the physical interface for locally destined packets");
392
393 /* log STP state changes */
394 static VNET_DEFINE(int, log_stp);
395 #define V_log_stp VNET(log_stp)
396 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
397 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
398 "Log STP state changes");
399
400 /* share MAC with first bridge member */
401 static VNET_DEFINE(int, bridge_inherit_mac);
402 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
403 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
404 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
405 "Inherit MAC address from the first bridge member");
406
407 static VNET_DEFINE(int, allow_llz_overlap) = 0;
408 #define V_allow_llz_overlap VNET(allow_llz_overlap)
409 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
410 CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
411 "Allow overlap of link-local scope "
412 "zones of a bridge interface and the member interfaces");
413
414 struct bridge_control {
415 int (*bc_func)(struct bridge_softc *, void *);
416 int bc_argsize;
417 int bc_flags;
418 };
419
420 #define BC_F_COPYIN 0x01 /* copy arguments in */
421 #define BC_F_COPYOUT 0x02 /* copy arguments out */
422 #define BC_F_SUSER 0x04 /* do super-user check */
423
424 const struct bridge_control bridge_control_table[] = {
425 { bridge_ioctl_add, sizeof(struct ifbreq),
426 BC_F_COPYIN|BC_F_SUSER },
427 { bridge_ioctl_del, sizeof(struct ifbreq),
428 BC_F_COPYIN|BC_F_SUSER },
429
430 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
431 BC_F_COPYIN|BC_F_COPYOUT },
432 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
433 BC_F_COPYIN|BC_F_SUSER },
434
435 { bridge_ioctl_scache, sizeof(struct ifbrparam),
436 BC_F_COPYIN|BC_F_SUSER },
437 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
438 BC_F_COPYOUT },
439
440 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
441 BC_F_COPYIN|BC_F_COPYOUT },
442 { bridge_ioctl_rts, sizeof(struct ifbaconf),
443 BC_F_COPYIN|BC_F_COPYOUT },
444
445 { bridge_ioctl_saddr, sizeof(struct ifbareq),
446 BC_F_COPYIN|BC_F_SUSER },
447
448 { bridge_ioctl_sto, sizeof(struct ifbrparam),
449 BC_F_COPYIN|BC_F_SUSER },
450 { bridge_ioctl_gto, sizeof(struct ifbrparam),
451 BC_F_COPYOUT },
452
453 { bridge_ioctl_daddr, sizeof(struct ifbareq),
454 BC_F_COPYIN|BC_F_SUSER },
455
456 { bridge_ioctl_flush, sizeof(struct ifbreq),
457 BC_F_COPYIN|BC_F_SUSER },
458
459 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
460 BC_F_COPYOUT },
461 { bridge_ioctl_spri, sizeof(struct ifbrparam),
462 BC_F_COPYIN|BC_F_SUSER },
463
464 { bridge_ioctl_ght, sizeof(struct ifbrparam),
465 BC_F_COPYOUT },
466 { bridge_ioctl_sht, sizeof(struct ifbrparam),
467 BC_F_COPYIN|BC_F_SUSER },
468
469 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
470 BC_F_COPYOUT },
471 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
472 BC_F_COPYIN|BC_F_SUSER },
473
474 { bridge_ioctl_gma, sizeof(struct ifbrparam),
475 BC_F_COPYOUT },
476 { bridge_ioctl_sma, sizeof(struct ifbrparam),
477 BC_F_COPYIN|BC_F_SUSER },
478
479 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
480 BC_F_COPYIN|BC_F_SUSER },
481
482 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
483 BC_F_COPYIN|BC_F_SUSER },
484
485 { bridge_ioctl_addspan, sizeof(struct ifbreq),
486 BC_F_COPYIN|BC_F_SUSER },
487 { bridge_ioctl_delspan, sizeof(struct ifbreq),
488 BC_F_COPYIN|BC_F_SUSER },
489
490 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
491 BC_F_COPYOUT },
492
493 { bridge_ioctl_grte, sizeof(struct ifbrparam),
494 BC_F_COPYOUT },
495
496 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
497 BC_F_COPYIN|BC_F_COPYOUT },
498
499 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
500 BC_F_COPYIN|BC_F_SUSER },
501
502 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
503 BC_F_COPYIN|BC_F_SUSER },
504
505 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
506 BC_F_COPYIN|BC_F_SUSER },
507
508 };
509 const int bridge_control_table_size = nitems(bridge_control_table);
510
511 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list);
512 #define V_bridge_list VNET(bridge_list)
513 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
514 "if_bridge list", NULL, MTX_DEF)
515 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
516 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
517 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
518
519 static VNET_DEFINE(struct if_clone *, bridge_cloner);
520 #define V_bridge_cloner VNET(bridge_cloner)
521
522 static const char bridge_name[] = "bridge";
523
524 static void
525 vnet_bridge_init(const void *unused __unused)
526 {
527
528 BRIDGE_LIST_LOCK_INIT();
529 LIST_INIT(&V_bridge_list);
530 V_bridge_cloner = if_clone_simple(bridge_name,
531 bridge_clone_create, bridge_clone_destroy, 0);
532 }
533 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
534 vnet_bridge_init, NULL);
535
536 static void
537 vnet_bridge_uninit(const void *unused __unused)
538 {
539
540 if_clone_detach(V_bridge_cloner);
541 V_bridge_cloner = NULL;
542 BRIDGE_LIST_LOCK_DESTROY();
543 }
544 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
545 vnet_bridge_uninit, NULL);
546
547 static int
548 bridge_modevent(module_t mod, int type, void *data)
549 {
550
551 switch (type) {
552 case MOD_LOAD:
553 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
554 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
555 UMA_ALIGN_PTR, 0);
556 bridge_input_p = bridge_input;
557 bridge_output_p = bridge_output;
558 bridge_dn_p = bridge_dummynet;
559 bridge_linkstate_p = bridge_linkstate;
560 bridge_detach_cookie = EVENTHANDLER_REGISTER(
561 ifnet_departure_event, bridge_ifdetach, NULL,
562 EVENTHANDLER_PRI_ANY);
563 break;
564 case MOD_UNLOAD:
565 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
566 bridge_detach_cookie);
567 uma_zdestroy(bridge_rtnode_zone);
568 bridge_input_p = NULL;
569 bridge_output_p = NULL;
570 bridge_dn_p = NULL;
571 bridge_linkstate_p = NULL;
572 break;
573 default:
574 return (EOPNOTSUPP);
575 }
576 return (0);
577 }
578
579 static moduledata_t bridge_mod = {
580 "if_bridge",
581 bridge_modevent,
582 0
583 };
584
585 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
586 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
587
588 /*
589 * handler for net.link.bridge.ipfw
590 */
591 static int
592 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
593 {
594 int enable = V_pfil_ipfw;
595 int error;
596
597 error = sysctl_handle_int(oidp, &enable, 0, req);
598 enable &= 1;
599
600 if (enable != V_pfil_ipfw) {
601 V_pfil_ipfw = enable;
602
603 /*
604 * Disable pfil so that ipfw doesnt run twice, if the user
605 * really wants both then they can re-enable pfil_bridge and/or
606 * pfil_member. Also allow non-ip packets as ipfw can filter by
607 * layer2 type.
608 */
609 if (V_pfil_ipfw) {
610 V_pfil_onlyip = 0;
611 V_pfil_bridge = 0;
612 V_pfil_member = 0;
613 }
614 }
615
616 return (error);
617 }
618 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
619 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
620 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
621 "Layer2 filter with IPFW");
622
623 /*
624 * bridge_clone_create:
625 *
626 * Create a new bridge instance.
627 */
628 static int
629 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
630 {
631 struct bridge_softc *sc, *sc2;
632 struct ifnet *bifp, *ifp;
633 int fb, retry;
634 unsigned long hostid;
635
636 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
637 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
638 if (ifp == NULL) {
639 free(sc, M_DEVBUF);
640 return (ENOSPC);
641 }
642
643 BRIDGE_LOCK_INIT(sc);
644 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
645 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
646
647 /* Initialize our routing table. */
648 bridge_rtable_init(sc);
649
650 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
651
652 LIST_INIT(&sc->sc_iflist);
653 LIST_INIT(&sc->sc_spanlist);
654
655 ifp->if_softc = sc;
656 if_initname(ifp, bridge_name, unit);
657 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
658 ifp->if_ioctl = bridge_ioctl;
659 ifp->if_transmit = bridge_transmit;
660 ifp->if_qflush = bridge_qflush;
661 ifp->if_init = bridge_init;
662 ifp->if_type = IFT_BRIDGE;
663
664 /*
665 * Generate an ethernet address with a locally administered address.
666 *
667 * Since we are using random ethernet addresses for the bridge, it is
668 * possible that we might have address collisions, so make sure that
669 * this hardware address isn't already in use on another bridge.
670 * The first try uses the hostid and falls back to arc4rand().
671 */
672 fb = 0;
673 getcredhostid(curthread->td_ucred, &hostid);
674 do {
675 if (fb || hostid == 0) {
676 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
677 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
678 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
679 } else {
680 sc->sc_defaddr[0] = 0x2;
681 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
682 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
683 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
684 sc->sc_defaddr[4] = hostid & 0xff;
685 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
686 }
687
688 fb = 1;
689 retry = 0;
690 BRIDGE_LIST_LOCK();
691 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
692 bifp = sc2->sc_ifp;
693 if (memcmp(sc->sc_defaddr,
694 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
695 retry = 1;
696 break;
697 }
698 }
699 BRIDGE_LIST_UNLOCK();
700 } while (retry == 1);
701
702 bstp_attach(&sc->sc_stp, &bridge_ops);
703 ether_ifattach(ifp, sc->sc_defaddr);
704 /* Now undo some of the damage... */
705 ifp->if_baudrate = 0;
706 ifp->if_type = IFT_BRIDGE;
707
708 BRIDGE_LIST_LOCK();
709 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
710 BRIDGE_LIST_UNLOCK();
711
712 return (0);
713 }
714
715 /*
716 * bridge_clone_destroy:
717 *
718 * Destroy a bridge instance.
719 */
720 static void
721 bridge_clone_destroy(struct ifnet *ifp)
722 {
723 struct bridge_softc *sc = ifp->if_softc;
724 struct bridge_iflist *bif;
725
726 BRIDGE_LOCK(sc);
727
728 bridge_stop(ifp, 1);
729 ifp->if_flags &= ~IFF_UP;
730
731 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
732 bridge_delete_member(sc, bif, 0);
733
734 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
735 bridge_delete_span(sc, bif);
736 }
737
738 BRIDGE_UNLOCK(sc);
739
740 callout_drain(&sc->sc_brcallout);
741
742 BRIDGE_LIST_LOCK();
743 LIST_REMOVE(sc, sc_list);
744 BRIDGE_LIST_UNLOCK();
745
746 bstp_detach(&sc->sc_stp);
747 ether_ifdetach(ifp);
748 if_free(ifp);
749
750 /* Tear down the routing table. */
751 bridge_rtable_fini(sc);
752
753 BRIDGE_LOCK_DESTROY(sc);
754 free(sc, M_DEVBUF);
755 }
756
757 /*
758 * bridge_ioctl:
759 *
760 * Handle a control request from the operator.
761 */
762 static int
763 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
764 {
765 struct bridge_softc *sc = ifp->if_softc;
766 struct ifreq *ifr = (struct ifreq *)data;
767 struct bridge_iflist *bif;
768 struct thread *td = curthread;
769 union {
770 struct ifbreq ifbreq;
771 struct ifbifconf ifbifconf;
772 struct ifbareq ifbareq;
773 struct ifbaconf ifbaconf;
774 struct ifbrparam ifbrparam;
775 struct ifbropreq ifbropreq;
776 } args;
777 struct ifdrv *ifd = (struct ifdrv *) data;
778 const struct bridge_control *bc;
779 int error = 0;
780
781 switch (cmd) {
782
783 case SIOCADDMULTI:
784 case SIOCDELMULTI:
785 break;
786
787 case SIOCGDRVSPEC:
788 case SIOCSDRVSPEC:
789 if (ifd->ifd_cmd >= bridge_control_table_size) {
790 error = EINVAL;
791 break;
792 }
793 bc = &bridge_control_table[ifd->ifd_cmd];
794
795 if (cmd == SIOCGDRVSPEC &&
796 (bc->bc_flags & BC_F_COPYOUT) == 0) {
797 error = EINVAL;
798 break;
799 }
800 else if (cmd == SIOCSDRVSPEC &&
801 (bc->bc_flags & BC_F_COPYOUT) != 0) {
802 error = EINVAL;
803 break;
804 }
805
806 if (bc->bc_flags & BC_F_SUSER) {
807 error = priv_check(td, PRIV_NET_BRIDGE);
808 if (error)
809 break;
810 }
811
812 if (ifd->ifd_len != bc->bc_argsize ||
813 ifd->ifd_len > sizeof(args)) {
814 error = EINVAL;
815 break;
816 }
817
818 bzero(&args, sizeof(args));
819 if (bc->bc_flags & BC_F_COPYIN) {
820 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
821 if (error)
822 break;
823 }
824
825 BRIDGE_LOCK(sc);
826 error = (*bc->bc_func)(sc, &args);
827 BRIDGE_UNLOCK(sc);
828 if (error)
829 break;
830
831 if (bc->bc_flags & BC_F_COPYOUT)
832 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
833
834 break;
835
836 case SIOCSIFFLAGS:
837 if (!(ifp->if_flags & IFF_UP) &&
838 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
839 /*
840 * If interface is marked down and it is running,
841 * then stop and disable it.
842 */
843 BRIDGE_LOCK(sc);
844 bridge_stop(ifp, 1);
845 BRIDGE_UNLOCK(sc);
846 } else if ((ifp->if_flags & IFF_UP) &&
847 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
848 /*
849 * If interface is marked up and it is stopped, then
850 * start it.
851 */
852 (*ifp->if_init)(sc);
853 }
854 break;
855
856 case SIOCSIFMTU:
857 if (ifr->ifr_mtu < 576) {
858 error = EINVAL;
859 break;
860 }
861 if (LIST_EMPTY(&sc->sc_iflist)) {
862 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
863 break;
864 }
865 BRIDGE_LOCK(sc);
866 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
867 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
868 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
869 " != %d\n", sc->sc_ifp->if_xname,
870 bif->bif_ifp->if_mtu,
871 bif->bif_ifp->if_xname, ifr->ifr_mtu);
872 error = EINVAL;
873 break;
874 }
875 }
876 if (!error)
877 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
878 BRIDGE_UNLOCK(sc);
879 break;
880 default:
881 /*
882 * drop the lock as ether_ioctl() will call bridge_start() and
883 * cause the lock to be recursed.
884 */
885 error = ether_ioctl(ifp, cmd, data);
886 break;
887 }
888
889 return (error);
890 }
891
892 /*
893 * bridge_mutecaps:
894 *
895 * Clear or restore unwanted capabilities on the member interface
896 */
897 static void
898 bridge_mutecaps(struct bridge_softc *sc)
899 {
900 struct bridge_iflist *bif;
901 int enabled, mask;
902
903 /* Initial bitmask of capabilities to test */
904 mask = BRIDGE_IFCAPS_MASK;
905
906 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
907 /* Every member must support it or its disabled */
908 mask &= bif->bif_savedcaps;
909 }
910
911 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
912 enabled = bif->bif_ifp->if_capenable;
913 enabled &= ~BRIDGE_IFCAPS_STRIP;
914 /* strip off mask bits and enable them again if allowed */
915 enabled &= ~BRIDGE_IFCAPS_MASK;
916 enabled |= mask;
917 bridge_set_ifcap(sc, bif, enabled);
918 }
919
920 }
921
922 static void
923 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
924 {
925 struct ifnet *ifp = bif->bif_ifp;
926 struct ifreq ifr;
927 int error;
928
929 bzero(&ifr, sizeof(ifr));
930 ifr.ifr_reqcap = set;
931
932 if (ifp->if_capenable != set) {
933 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
934 if (error)
935 if_printf(sc->sc_ifp,
936 "error setting interface capabilities on %s\n",
937 ifp->if_xname);
938 }
939 }
940
941 /*
942 * bridge_lookup_member:
943 *
944 * Lookup a bridge member interface.
945 */
946 static struct bridge_iflist *
947 bridge_lookup_member(struct bridge_softc *sc, const char *name)
948 {
949 struct bridge_iflist *bif;
950 struct ifnet *ifp;
951
952 BRIDGE_LOCK_ASSERT(sc);
953
954 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
955 ifp = bif->bif_ifp;
956 if (strcmp(ifp->if_xname, name) == 0)
957 return (bif);
958 }
959
960 return (NULL);
961 }
962
963 /*
964 * bridge_lookup_member_if:
965 *
966 * Lookup a bridge member interface by ifnet*.
967 */
968 static struct bridge_iflist *
969 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
970 {
971 struct bridge_iflist *bif;
972
973 BRIDGE_LOCK_ASSERT(sc);
974
975 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
976 if (bif->bif_ifp == member_ifp)
977 return (bif);
978 }
979
980 return (NULL);
981 }
982
983 /*
984 * bridge_delete_member:
985 *
986 * Delete the specified member interface.
987 */
988 static void
989 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
990 int gone)
991 {
992 struct ifnet *ifs = bif->bif_ifp;
993 struct ifnet *fif = NULL;
994
995 BRIDGE_LOCK_ASSERT(sc);
996
997 if (bif->bif_flags & IFBIF_STP)
998 bstp_disable(&bif->bif_stp);
999
1000 ifs->if_bridge = NULL;
1001 BRIDGE_XLOCK(sc);
1002 LIST_REMOVE(bif, bif_next);
1003 BRIDGE_XDROP(sc);
1004
1005 /*
1006 * If removing the interface that gave the bridge its mac address, set
1007 * the mac address of the bridge to the address of the next member, or
1008 * to its default address if no members are left.
1009 */
1010 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1011 if (LIST_EMPTY(&sc->sc_iflist)) {
1012 bcopy(sc->sc_defaddr,
1013 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1014 sc->sc_ifaddr = NULL;
1015 } else {
1016 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1017 bcopy(IF_LLADDR(fif),
1018 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1019 sc->sc_ifaddr = fif;
1020 }
1021 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1022 }
1023
1024 bridge_linkcheck(sc);
1025 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1026 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1027 KASSERT(bif->bif_addrcnt == 0,
1028 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1029
1030 BRIDGE_UNLOCK(sc);
1031 if (!gone) {
1032 switch (ifs->if_type) {
1033 case IFT_ETHER:
1034 case IFT_L2VLAN:
1035 /*
1036 * Take the interface out of promiscuous mode, but only
1037 * if it was promiscuous in the first place. It might
1038 * not be if we're in the bridge_ioctl_add() error path.
1039 */
1040 if (ifs->if_flags & IFF_PROMISC)
1041 (void) ifpromisc(ifs, 0);
1042 break;
1043
1044 case IFT_GIF:
1045 break;
1046
1047 default:
1048 #ifdef DIAGNOSTIC
1049 panic("bridge_delete_member: impossible");
1050 #endif
1051 break;
1052 }
1053 /* reneable any interface capabilities */
1054 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1055 }
1056 bstp_destroy(&bif->bif_stp); /* prepare to free */
1057 BRIDGE_LOCK(sc);
1058 free(bif, M_DEVBUF);
1059 }
1060
1061 /*
1062 * bridge_delete_span:
1063 *
1064 * Delete the specified span interface.
1065 */
1066 static void
1067 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1068 {
1069 BRIDGE_LOCK_ASSERT(sc);
1070
1071 KASSERT(bif->bif_ifp->if_bridge == NULL,
1072 ("%s: not a span interface", __func__));
1073
1074 LIST_REMOVE(bif, bif_next);
1075 free(bif, M_DEVBUF);
1076 }
1077
1078 static int
1079 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1080 {
1081 struct ifbreq *req = arg;
1082 struct bridge_iflist *bif = NULL;
1083 struct ifnet *ifs;
1084 int error = 0;
1085
1086 ifs = ifunit(req->ifbr_ifsname);
1087 if (ifs == NULL)
1088 return (ENOENT);
1089 if (ifs->if_ioctl == NULL) /* must be supported */
1090 return (EINVAL);
1091
1092 /* If it's in the span list, it can't be a member. */
1093 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1094 if (ifs == bif->bif_ifp)
1095 return (EBUSY);
1096
1097 if (ifs->if_bridge == sc)
1098 return (EEXIST);
1099
1100 if (ifs->if_bridge != NULL)
1101 return (EBUSY);
1102
1103 switch (ifs->if_type) {
1104 case IFT_ETHER:
1105 case IFT_L2VLAN:
1106 case IFT_GIF:
1107 /* permitted interface types */
1108 break;
1109 default:
1110 return (EINVAL);
1111 }
1112
1113 #ifdef INET6
1114 /*
1115 * Two valid inet6 addresses with link-local scope must not be
1116 * on the parent interface and the member interfaces at the
1117 * same time. This restriction is needed to prevent violation
1118 * of link-local scope zone. Attempts to add a member
1119 * interface which has inet6 addresses when the parent has
1120 * inet6 triggers removal of all inet6 addresses on the member
1121 * interface.
1122 */
1123
1124 /* Check if the parent interface has a link-local scope addr. */
1125 if (V_allow_llz_overlap == 0 &&
1126 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1127 /*
1128 * If any, remove all inet6 addresses from the member
1129 * interfaces.
1130 */
1131 BRIDGE_XLOCK(sc);
1132 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1133 if (in6ifa_llaonifp(bif->bif_ifp)) {
1134 BRIDGE_UNLOCK(sc);
1135 in6_ifdetach(bif->bif_ifp);
1136 BRIDGE_LOCK(sc);
1137 if_printf(sc->sc_ifp,
1138 "IPv6 addresses on %s have been removed "
1139 "before adding it as a member to prevent "
1140 "IPv6 address scope violation.\n",
1141 bif->bif_ifp->if_xname);
1142 }
1143 }
1144 BRIDGE_XDROP(sc);
1145 if (in6ifa_llaonifp(ifs)) {
1146 BRIDGE_UNLOCK(sc);
1147 in6_ifdetach(ifs);
1148 BRIDGE_LOCK(sc);
1149 if_printf(sc->sc_ifp,
1150 "IPv6 addresses on %s have been removed "
1151 "before adding it as a member to prevent "
1152 "IPv6 address scope violation.\n",
1153 ifs->if_xname);
1154 }
1155 }
1156 #endif
1157 /* Allow the first Ethernet member to define the MTU */
1158 if (LIST_EMPTY(&sc->sc_iflist))
1159 sc->sc_ifp->if_mtu = ifs->if_mtu;
1160 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1161 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1162 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1163 return (EINVAL);
1164 }
1165
1166 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1167 if (bif == NULL)
1168 return (ENOMEM);
1169
1170 bif->bif_ifp = ifs;
1171 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1172 bif->bif_savedcaps = ifs->if_capenable;
1173
1174 /*
1175 * Assign the interface's MAC address to the bridge if it's the first
1176 * member and the MAC address of the bridge has not been changed from
1177 * the default randomly generated one.
1178 */
1179 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1180 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1181 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1182 sc->sc_ifaddr = ifs;
1183 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1184 }
1185
1186 ifs->if_bridge = sc;
1187 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1188 /*
1189 * XXX: XLOCK HERE!?!
1190 *
1191 * NOTE: insert_***HEAD*** should be safe for the traversals.
1192 */
1193 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1194
1195 /* Set interface capabilities to the intersection set of all members */
1196 bridge_mutecaps(sc);
1197 bridge_linkcheck(sc);
1198
1199 /* Place the interface into promiscuous mode */
1200 switch (ifs->if_type) {
1201 case IFT_ETHER:
1202 case IFT_L2VLAN:
1203 BRIDGE_UNLOCK(sc);
1204 error = ifpromisc(ifs, 1);
1205 BRIDGE_LOCK(sc);
1206 break;
1207 }
1208
1209 if (error)
1210 bridge_delete_member(sc, bif, 0);
1211 return (error);
1212 }
1213
1214 static int
1215 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1216 {
1217 struct ifbreq *req = arg;
1218 struct bridge_iflist *bif;
1219
1220 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1221 if (bif == NULL)
1222 return (ENOENT);
1223
1224 bridge_delete_member(sc, bif, 0);
1225
1226 return (0);
1227 }
1228
1229 static int
1230 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1231 {
1232 struct ifbreq *req = arg;
1233 struct bridge_iflist *bif;
1234 struct bstp_port *bp;
1235
1236 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1237 if (bif == NULL)
1238 return (ENOENT);
1239
1240 bp = &bif->bif_stp;
1241 req->ifbr_ifsflags = bif->bif_flags;
1242 req->ifbr_state = bp->bp_state;
1243 req->ifbr_priority = bp->bp_priority;
1244 req->ifbr_path_cost = bp->bp_path_cost;
1245 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1246 req->ifbr_proto = bp->bp_protover;
1247 req->ifbr_role = bp->bp_role;
1248 req->ifbr_stpflags = bp->bp_flags;
1249 req->ifbr_addrcnt = bif->bif_addrcnt;
1250 req->ifbr_addrmax = bif->bif_addrmax;
1251 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1252
1253 /* Copy STP state options as flags */
1254 if (bp->bp_operedge)
1255 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1256 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1257 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1258 if (bp->bp_ptp_link)
1259 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1260 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1261 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1262 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1263 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1264 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1265 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1266 return (0);
1267 }
1268
1269 static int
1270 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1271 {
1272 struct ifbreq *req = arg;
1273 struct bridge_iflist *bif;
1274 struct bstp_port *bp;
1275 int error;
1276
1277 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1278 if (bif == NULL)
1279 return (ENOENT);
1280 bp = &bif->bif_stp;
1281
1282 if (req->ifbr_ifsflags & IFBIF_SPAN)
1283 /* SPAN is readonly */
1284 return (EINVAL);
1285
1286 if (req->ifbr_ifsflags & IFBIF_STP) {
1287 if ((bif->bif_flags & IFBIF_STP) == 0) {
1288 error = bstp_enable(&bif->bif_stp);
1289 if (error)
1290 return (error);
1291 }
1292 } else {
1293 if ((bif->bif_flags & IFBIF_STP) != 0)
1294 bstp_disable(&bif->bif_stp);
1295 }
1296
1297 /* Pass on STP flags */
1298 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1299 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1300 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1301 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1302
1303 /* Save the bits relating to the bridge */
1304 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1305
1306 return (0);
1307 }
1308
1309 static int
1310 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1311 {
1312 struct ifbrparam *param = arg;
1313
1314 sc->sc_brtmax = param->ifbrp_csize;
1315 bridge_rttrim(sc);
1316
1317 return (0);
1318 }
1319
1320 static int
1321 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1322 {
1323 struct ifbrparam *param = arg;
1324
1325 param->ifbrp_csize = sc->sc_brtmax;
1326
1327 return (0);
1328 }
1329
1330 static int
1331 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1332 {
1333 struct ifbifconf *bifc = arg;
1334 struct bridge_iflist *bif;
1335 struct ifbreq breq;
1336 char *buf, *outbuf;
1337 int count, buflen, len, error = 0;
1338
1339 count = 0;
1340 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1341 count++;
1342 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1343 count++;
1344
1345 buflen = sizeof(breq) * count;
1346 if (bifc->ifbic_len == 0) {
1347 bifc->ifbic_len = buflen;
1348 return (0);
1349 }
1350 BRIDGE_UNLOCK(sc);
1351 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1352 BRIDGE_LOCK(sc);
1353
1354 count = 0;
1355 buf = outbuf;
1356 len = min(bifc->ifbic_len, buflen);
1357 bzero(&breq, sizeof(breq));
1358 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1359 if (len < sizeof(breq))
1360 break;
1361
1362 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1363 sizeof(breq.ifbr_ifsname));
1364 /* Fill in the ifbreq structure */
1365 error = bridge_ioctl_gifflags(sc, &breq);
1366 if (error)
1367 break;
1368 memcpy(buf, &breq, sizeof(breq));
1369 count++;
1370 buf += sizeof(breq);
1371 len -= sizeof(breq);
1372 }
1373 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1374 if (len < sizeof(breq))
1375 break;
1376
1377 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1378 sizeof(breq.ifbr_ifsname));
1379 breq.ifbr_ifsflags = bif->bif_flags;
1380 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1381 memcpy(buf, &breq, sizeof(breq));
1382 count++;
1383 buf += sizeof(breq);
1384 len -= sizeof(breq);
1385 }
1386
1387 BRIDGE_UNLOCK(sc);
1388 bifc->ifbic_len = sizeof(breq) * count;
1389 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1390 BRIDGE_LOCK(sc);
1391 free(outbuf, M_TEMP);
1392 return (error);
1393 }
1394
1395 static int
1396 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1397 {
1398 struct ifbaconf *bac = arg;
1399 struct bridge_rtnode *brt;
1400 struct ifbareq bareq;
1401 char *buf, *outbuf;
1402 int count, buflen, len, error = 0;
1403
1404 if (bac->ifbac_len == 0)
1405 return (0);
1406
1407 count = 0;
1408 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1409 count++;
1410 buflen = sizeof(bareq) * count;
1411
1412 BRIDGE_UNLOCK(sc);
1413 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1414 BRIDGE_LOCK(sc);
1415
1416 count = 0;
1417 buf = outbuf;
1418 len = min(bac->ifbac_len, buflen);
1419 bzero(&bareq, sizeof(bareq));
1420 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1421 if (len < sizeof(bareq))
1422 goto out;
1423 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1424 sizeof(bareq.ifba_ifsname));
1425 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1426 bareq.ifba_vlan = brt->brt_vlan;
1427 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1428 time_uptime < brt->brt_expire)
1429 bareq.ifba_expire = brt->brt_expire - time_uptime;
1430 else
1431 bareq.ifba_expire = 0;
1432 bareq.ifba_flags = brt->brt_flags;
1433
1434 memcpy(buf, &bareq, sizeof(bareq));
1435 count++;
1436 buf += sizeof(bareq);
1437 len -= sizeof(bareq);
1438 }
1439 out:
1440 BRIDGE_UNLOCK(sc);
1441 bac->ifbac_len = sizeof(bareq) * count;
1442 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1443 BRIDGE_LOCK(sc);
1444 free(outbuf, M_TEMP);
1445 return (error);
1446 }
1447
1448 static int
1449 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1450 {
1451 struct ifbareq *req = arg;
1452 struct bridge_iflist *bif;
1453 int error;
1454
1455 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1456 if (bif == NULL)
1457 return (ENOENT);
1458
1459 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1460 req->ifba_flags);
1461
1462 return (error);
1463 }
1464
1465 static int
1466 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1467 {
1468 struct ifbrparam *param = arg;
1469
1470 sc->sc_brttimeout = param->ifbrp_ctime;
1471 return (0);
1472 }
1473
1474 static int
1475 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1476 {
1477 struct ifbrparam *param = arg;
1478
1479 param->ifbrp_ctime = sc->sc_brttimeout;
1480 return (0);
1481 }
1482
1483 static int
1484 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1485 {
1486 struct ifbareq *req = arg;
1487
1488 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1489 }
1490
1491 static int
1492 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1493 {
1494 struct ifbreq *req = arg;
1495
1496 bridge_rtflush(sc, req->ifbr_ifsflags);
1497 return (0);
1498 }
1499
1500 static int
1501 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1502 {
1503 struct ifbrparam *param = arg;
1504 struct bstp_state *bs = &sc->sc_stp;
1505
1506 param->ifbrp_prio = bs->bs_bridge_priority;
1507 return (0);
1508 }
1509
1510 static int
1511 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1512 {
1513 struct ifbrparam *param = arg;
1514
1515 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1516 }
1517
1518 static int
1519 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1520 {
1521 struct ifbrparam *param = arg;
1522 struct bstp_state *bs = &sc->sc_stp;
1523
1524 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1525 return (0);
1526 }
1527
1528 static int
1529 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1530 {
1531 struct ifbrparam *param = arg;
1532
1533 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1534 }
1535
1536 static int
1537 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1538 {
1539 struct ifbrparam *param = arg;
1540 struct bstp_state *bs = &sc->sc_stp;
1541
1542 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1543 return (0);
1544 }
1545
1546 static int
1547 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1548 {
1549 struct ifbrparam *param = arg;
1550
1551 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1552 }
1553
1554 static int
1555 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1556 {
1557 struct ifbrparam *param = arg;
1558 struct bstp_state *bs = &sc->sc_stp;
1559
1560 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1561 return (0);
1562 }
1563
1564 static int
1565 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1566 {
1567 struct ifbrparam *param = arg;
1568
1569 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1570 }
1571
1572 static int
1573 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1574 {
1575 struct ifbreq *req = arg;
1576 struct bridge_iflist *bif;
1577
1578 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1579 if (bif == NULL)
1580 return (ENOENT);
1581
1582 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1583 }
1584
1585 static int
1586 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1587 {
1588 struct ifbreq *req = arg;
1589 struct bridge_iflist *bif;
1590
1591 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1592 if (bif == NULL)
1593 return (ENOENT);
1594
1595 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1596 }
1597
1598 static int
1599 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1600 {
1601 struct ifbreq *req = arg;
1602 struct bridge_iflist *bif;
1603
1604 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1605 if (bif == NULL)
1606 return (ENOENT);
1607
1608 bif->bif_addrmax = req->ifbr_addrmax;
1609 return (0);
1610 }
1611
1612 static int
1613 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1614 {
1615 struct ifbreq *req = arg;
1616 struct bridge_iflist *bif = NULL;
1617 struct ifnet *ifs;
1618
1619 ifs = ifunit(req->ifbr_ifsname);
1620 if (ifs == NULL)
1621 return (ENOENT);
1622
1623 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1624 if (ifs == bif->bif_ifp)
1625 return (EBUSY);
1626
1627 if (ifs->if_bridge != NULL)
1628 return (EBUSY);
1629
1630 switch (ifs->if_type) {
1631 case IFT_ETHER:
1632 case IFT_GIF:
1633 case IFT_L2VLAN:
1634 break;
1635 default:
1636 return (EINVAL);
1637 }
1638
1639 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1640 if (bif == NULL)
1641 return (ENOMEM);
1642
1643 bif->bif_ifp = ifs;
1644 bif->bif_flags = IFBIF_SPAN;
1645
1646 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1647
1648 return (0);
1649 }
1650
1651 static int
1652 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1653 {
1654 struct ifbreq *req = arg;
1655 struct bridge_iflist *bif;
1656 struct ifnet *ifs;
1657
1658 ifs = ifunit(req->ifbr_ifsname);
1659 if (ifs == NULL)
1660 return (ENOENT);
1661
1662 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1663 if (ifs == bif->bif_ifp)
1664 break;
1665
1666 if (bif == NULL)
1667 return (ENOENT);
1668
1669 bridge_delete_span(sc, bif);
1670
1671 return (0);
1672 }
1673
1674 static int
1675 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1676 {
1677 struct ifbropreq *req = arg;
1678 struct bstp_state *bs = &sc->sc_stp;
1679 struct bstp_port *root_port;
1680
1681 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1682 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1683 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1684
1685 root_port = bs->bs_root_port;
1686 if (root_port == NULL)
1687 req->ifbop_root_port = 0;
1688 else
1689 req->ifbop_root_port = root_port->bp_ifp->if_index;
1690
1691 req->ifbop_holdcount = bs->bs_txholdcount;
1692 req->ifbop_priority = bs->bs_bridge_priority;
1693 req->ifbop_protocol = bs->bs_protover;
1694 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1695 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1696 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1697 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1698 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1699 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1700
1701 return (0);
1702 }
1703
1704 static int
1705 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1706 {
1707 struct ifbrparam *param = arg;
1708
1709 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1710 return (0);
1711 }
1712
1713 static int
1714 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1715 {
1716 struct ifbpstpconf *bifstp = arg;
1717 struct bridge_iflist *bif;
1718 struct bstp_port *bp;
1719 struct ifbpstpreq bpreq;
1720 char *buf, *outbuf;
1721 int count, buflen, len, error = 0;
1722
1723 count = 0;
1724 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1725 if ((bif->bif_flags & IFBIF_STP) != 0)
1726 count++;
1727 }
1728
1729 buflen = sizeof(bpreq) * count;
1730 if (bifstp->ifbpstp_len == 0) {
1731 bifstp->ifbpstp_len = buflen;
1732 return (0);
1733 }
1734
1735 BRIDGE_UNLOCK(sc);
1736 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1737 BRIDGE_LOCK(sc);
1738
1739 count = 0;
1740 buf = outbuf;
1741 len = min(bifstp->ifbpstp_len, buflen);
1742 bzero(&bpreq, sizeof(bpreq));
1743 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1744 if (len < sizeof(bpreq))
1745 break;
1746
1747 if ((bif->bif_flags & IFBIF_STP) == 0)
1748 continue;
1749
1750 bp = &bif->bif_stp;
1751 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1752 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1753 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1754 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1755 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1756 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1757
1758 memcpy(buf, &bpreq, sizeof(bpreq));
1759 count++;
1760 buf += sizeof(bpreq);
1761 len -= sizeof(bpreq);
1762 }
1763
1764 BRIDGE_UNLOCK(sc);
1765 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1766 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1767 BRIDGE_LOCK(sc);
1768 free(outbuf, M_TEMP);
1769 return (error);
1770 }
1771
1772 static int
1773 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1774 {
1775 struct ifbrparam *param = arg;
1776
1777 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1778 }
1779
1780 static int
1781 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1782 {
1783 struct ifbrparam *param = arg;
1784
1785 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1786 }
1787
1788 /*
1789 * bridge_ifdetach:
1790 *
1791 * Detach an interface from a bridge. Called when a member
1792 * interface is detaching.
1793 */
1794 static void
1795 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1796 {
1797 struct bridge_softc *sc = ifp->if_bridge;
1798 struct bridge_iflist *bif;
1799
1800 if (ifp->if_flags & IFF_RENAMING)
1801 return;
1802 if (V_bridge_cloner == NULL) {
1803 /*
1804 * This detach handler can be called after
1805 * vnet_bridge_uninit(). Just return in that case.
1806 */
1807 return;
1808 }
1809 /* Check if the interface is a bridge member */
1810 if (sc != NULL) {
1811 BRIDGE_LOCK(sc);
1812
1813 bif = bridge_lookup_member_if(sc, ifp);
1814 if (bif != NULL)
1815 bridge_delete_member(sc, bif, 1);
1816
1817 BRIDGE_UNLOCK(sc);
1818 return;
1819 }
1820
1821 /* Check if the interface is a span port */
1822 BRIDGE_LIST_LOCK();
1823 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1824 BRIDGE_LOCK(sc);
1825 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1826 if (ifp == bif->bif_ifp) {
1827 bridge_delete_span(sc, bif);
1828 break;
1829 }
1830
1831 BRIDGE_UNLOCK(sc);
1832 }
1833 BRIDGE_LIST_UNLOCK();
1834 }
1835
1836 /*
1837 * bridge_init:
1838 *
1839 * Initialize a bridge interface.
1840 */
1841 static void
1842 bridge_init(void *xsc)
1843 {
1844 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1845 struct ifnet *ifp = sc->sc_ifp;
1846
1847 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1848 return;
1849
1850 BRIDGE_LOCK(sc);
1851 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1852 bridge_timer, sc);
1853
1854 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1855 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1856
1857 BRIDGE_UNLOCK(sc);
1858 }
1859
1860 /*
1861 * bridge_stop:
1862 *
1863 * Stop the bridge interface.
1864 */
1865 static void
1866 bridge_stop(struct ifnet *ifp, int disable)
1867 {
1868 struct bridge_softc *sc = ifp->if_softc;
1869
1870 BRIDGE_LOCK_ASSERT(sc);
1871
1872 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1873 return;
1874
1875 callout_stop(&sc->sc_brcallout);
1876 bstp_stop(&sc->sc_stp);
1877
1878 bridge_rtflush(sc, IFBF_FLUSHDYN);
1879
1880 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1881 }
1882
1883 /*
1884 * bridge_enqueue:
1885 *
1886 * Enqueue a packet on a bridge member interface.
1887 *
1888 */
1889 static int
1890 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1891 {
1892 int len, err = 0;
1893 short mflags;
1894 struct mbuf *m0;
1895
1896 /* We may be sending a fragment so traverse the mbuf */
1897 for (; m; m = m0) {
1898 m0 = m->m_nextpkt;
1899 m->m_nextpkt = NULL;
1900 len = m->m_pkthdr.len;
1901 mflags = m->m_flags;
1902
1903 /*
1904 * If underlying interface can not do VLAN tag insertion itself
1905 * then attach a packet tag that holds it.
1906 */
1907 if ((m->m_flags & M_VLANTAG) &&
1908 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1909 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1910 if (m == NULL) {
1911 if_printf(dst_ifp,
1912 "unable to prepend VLAN header\n");
1913 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1914 continue;
1915 }
1916 m->m_flags &= ~M_VLANTAG;
1917 }
1918
1919 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1920 m_freem(m0);
1921 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1922 break;
1923 }
1924
1925 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1926 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1927 if (mflags & M_MCAST)
1928 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1929 }
1930
1931 return (err);
1932 }
1933
1934 /*
1935 * bridge_dummynet:
1936 *
1937 * Receive a queued packet from dummynet and pass it on to the output
1938 * interface.
1939 *
1940 * The mbuf has the Ethernet header already attached.
1941 */
1942 static void
1943 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1944 {
1945 struct bridge_softc *sc;
1946
1947 sc = ifp->if_bridge;
1948
1949 /*
1950 * The packet didnt originate from a member interface. This should only
1951 * ever happen if a member interface is removed while packets are
1952 * queued for it.
1953 */
1954 if (sc == NULL) {
1955 m_freem(m);
1956 return;
1957 }
1958
1959 if (PFIL_HOOKED(&V_inet_pfil_hook)
1960 #ifdef INET6
1961 || PFIL_HOOKED(&V_inet6_pfil_hook)
1962 #endif
1963 ) {
1964 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1965 return;
1966 if (m == NULL)
1967 return;
1968 }
1969
1970 bridge_enqueue(sc, ifp, m);
1971 }
1972
1973 /*
1974 * bridge_output:
1975 *
1976 * Send output from a bridge member interface. This
1977 * performs the bridging function for locally originated
1978 * packets.
1979 *
1980 * The mbuf has the Ethernet header already attached. We must
1981 * enqueue or free the mbuf before returning.
1982 */
1983 static int
1984 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1985 struct rtentry *rt)
1986 {
1987 struct ether_header *eh;
1988 struct ifnet *dst_if;
1989 struct bridge_softc *sc;
1990 uint16_t vlan;
1991
1992 if (m->m_len < ETHER_HDR_LEN) {
1993 m = m_pullup(m, ETHER_HDR_LEN);
1994 if (m == NULL)
1995 return (0);
1996 }
1997
1998 eh = mtod(m, struct ether_header *);
1999 sc = ifp->if_bridge;
2000 vlan = VLANTAGOF(m);
2001
2002 BRIDGE_LOCK(sc);
2003
2004 /*
2005 * If bridge is down, but the original output interface is up,
2006 * go ahead and send out that interface. Otherwise, the packet
2007 * is dropped below.
2008 */
2009 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2010 dst_if = ifp;
2011 goto sendunicast;
2012 }
2013
2014 /*
2015 * If the packet is a multicast, or we don't know a better way to
2016 * get there, send to all interfaces.
2017 */
2018 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2019 dst_if = NULL;
2020 else
2021 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2022 if (dst_if == NULL) {
2023 struct bridge_iflist *bif;
2024 struct mbuf *mc;
2025 int error = 0, used = 0;
2026
2027 bridge_span(sc, m);
2028
2029 BRIDGE_LOCK2REF(sc, error);
2030 if (error) {
2031 m_freem(m);
2032 return (0);
2033 }
2034
2035 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2036 dst_if = bif->bif_ifp;
2037
2038 if (dst_if->if_type == IFT_GIF)
2039 continue;
2040 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2041 continue;
2042
2043 /*
2044 * If this is not the original output interface,
2045 * and the interface is participating in spanning
2046 * tree, make sure the port is in a state that
2047 * allows forwarding.
2048 */
2049 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2050 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2051 continue;
2052
2053 if (LIST_NEXT(bif, bif_next) == NULL) {
2054 used = 1;
2055 mc = m;
2056 } else {
2057 mc = m_copypacket(m, M_NOWAIT);
2058 if (mc == NULL) {
2059 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2060 continue;
2061 }
2062 }
2063
2064 bridge_enqueue(sc, dst_if, mc);
2065 }
2066 if (used == 0)
2067 m_freem(m);
2068 BRIDGE_UNREF(sc);
2069 return (0);
2070 }
2071
2072 sendunicast:
2073 /*
2074 * XXX Spanning tree consideration here?
2075 */
2076
2077 bridge_span(sc, m);
2078 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2079 m_freem(m);
2080 BRIDGE_UNLOCK(sc);
2081 return (0);
2082 }
2083
2084 BRIDGE_UNLOCK(sc);
2085 bridge_enqueue(sc, dst_if, m);
2086 return (0);
2087 }
2088
2089 /*
2090 * bridge_transmit:
2091 *
2092 * Do output on a bridge.
2093 *
2094 */
2095 static int
2096 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2097 {
2098 struct bridge_softc *sc;
2099 struct ether_header *eh;
2100 struct ifnet *dst_if;
2101 int error = 0;
2102
2103 sc = ifp->if_softc;
2104
2105 ETHER_BPF_MTAP(ifp, m);
2106
2107 eh = mtod(m, struct ether_header *);
2108
2109 BRIDGE_LOCK(sc);
2110 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2111 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2112 BRIDGE_UNLOCK(sc);
2113 error = bridge_enqueue(sc, dst_if, m);
2114 } else
2115 bridge_broadcast(sc, ifp, m, 0);
2116
2117 return (error);
2118 }
2119
2120 /*
2121 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2122 */
2123 static void
2124 bridge_qflush(struct ifnet *ifp __unused)
2125 {
2126 }
2127
2128 /*
2129 * bridge_forward:
2130 *
2131 * The forwarding function of the bridge.
2132 *
2133 * NOTE: Releases the lock on return.
2134 */
2135 static void
2136 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2137 struct mbuf *m)
2138 {
2139 struct bridge_iflist *dbif;
2140 struct ifnet *src_if, *dst_if, *ifp;
2141 struct ether_header *eh;
2142 uint16_t vlan;
2143 uint8_t *dst;
2144 int error;
2145
2146 src_if = m->m_pkthdr.rcvif;
2147 ifp = sc->sc_ifp;
2148
2149 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2150 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2151 vlan = VLANTAGOF(m);
2152
2153 if ((sbif->bif_flags & IFBIF_STP) &&
2154 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2155 goto drop;
2156
2157 eh = mtod(m, struct ether_header *);
2158 dst = eh->ether_dhost;
2159
2160 /* If the interface is learning, record the address. */
2161 if (sbif->bif_flags & IFBIF_LEARNING) {
2162 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2163 sbif, 0, IFBAF_DYNAMIC);
2164 /*
2165 * If the interface has addresses limits then deny any source
2166 * that is not in the cache.
2167 */
2168 if (error && sbif->bif_addrmax)
2169 goto drop;
2170 }
2171
2172 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2173 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2174 goto drop;
2175
2176 /*
2177 * At this point, the port either doesn't participate
2178 * in spanning tree or it is in the forwarding state.
2179 */
2180
2181 /*
2182 * If the packet is unicast, destined for someone on
2183 * "this" side of the bridge, drop it.
2184 */
2185 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2186 dst_if = bridge_rtlookup(sc, dst, vlan);
2187 if (src_if == dst_if)
2188 goto drop;
2189 } else {
2190 /*
2191 * Check if its a reserved multicast address, any address
2192 * listed in 802.1D section 7.12.6 may not be forwarded by the
2193 * bridge.
2194 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2195 */
2196 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2197 dst[2] == 0xc2 && dst[3] == 0x00 &&
2198 dst[4] == 0x00 && dst[5] <= 0x0f)
2199 goto drop;
2200
2201 /* ...forward it to all interfaces. */
2202 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2203 dst_if = NULL;
2204 }
2205
2206 /*
2207 * If we have a destination interface which is a member of our bridge,
2208 * OR this is a unicast packet, push it through the bpf(4) machinery.
2209 * For broadcast or multicast packets, don't bother because it will
2210 * be reinjected into ether_input. We do this before we pass the packets
2211 * through the pfil(9) framework, as it is possible that pfil(9) will
2212 * drop the packet, or possibly modify it, making it difficult to debug
2213 * firewall issues on the bridge.
2214 */
2215 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2216 ETHER_BPF_MTAP(ifp, m);
2217
2218 /* run the packet filter */
2219 if (PFIL_HOOKED(&V_inet_pfil_hook)
2220 #ifdef INET6
2221 || PFIL_HOOKED(&V_inet6_pfil_hook)
2222 #endif
2223 ) {
2224 BRIDGE_UNLOCK(sc);
2225 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2226 return;
2227 if (m == NULL)
2228 return;
2229 BRIDGE_LOCK(sc);
2230 }
2231
2232 if (dst_if == NULL) {
2233 bridge_broadcast(sc, src_if, m, 1);
2234 return;
2235 }
2236
2237 /*
2238 * At this point, we're dealing with a unicast frame
2239 * going to a different interface.
2240 */
2241 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2242 goto drop;
2243
2244 dbif = bridge_lookup_member_if(sc, dst_if);
2245 if (dbif == NULL)
2246 /* Not a member of the bridge (anymore?) */
2247 goto drop;
2248
2249 /* Private segments can not talk to each other */
2250 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2251 goto drop;
2252
2253 if ((dbif->bif_flags & IFBIF_STP) &&
2254 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2255 goto drop;
2256
2257 BRIDGE_UNLOCK(sc);
2258
2259 if (PFIL_HOOKED(&V_inet_pfil_hook)
2260 #ifdef INET6
2261 || PFIL_HOOKED(&V_inet6_pfil_hook)
2262 #endif
2263 ) {
2264 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2265 return;
2266 if (m == NULL)
2267 return;
2268 }
2269
2270 bridge_enqueue(sc, dst_if, m);
2271 return;
2272
2273 drop:
2274 BRIDGE_UNLOCK(sc);
2275 m_freem(m);
2276 }
2277
2278 /*
2279 * bridge_input:
2280 *
2281 * Receive input from a member interface. Queue the packet for
2282 * bridging if it is not for us.
2283 */
2284 static struct mbuf *
2285 bridge_input(struct ifnet *ifp, struct mbuf *m)
2286 {
2287 struct bridge_softc *sc = ifp->if_bridge;
2288 struct bridge_iflist *bif, *bif2;
2289 struct ifnet *bifp;
2290 struct ether_header *eh;
2291 struct mbuf *mc, *mc2;
2292 uint16_t vlan;
2293 int error;
2294
2295 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2296 return (m);
2297
2298 bifp = sc->sc_ifp;
2299 vlan = VLANTAGOF(m);
2300
2301 /*
2302 * Implement support for bridge monitoring. If this flag has been
2303 * set on this interface, discard the packet once we push it through
2304 * the bpf(4) machinery, but before we do, increment the byte and
2305 * packet counters associated with this interface.
2306 */
2307 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2308 m->m_pkthdr.rcvif = bifp;
2309 ETHER_BPF_MTAP(bifp, m);
2310 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2311 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2312 m_freem(m);
2313 return (NULL);
2314 }
2315 BRIDGE_LOCK(sc);
2316 bif = bridge_lookup_member_if(sc, ifp);
2317 if (bif == NULL) {
2318 BRIDGE_UNLOCK(sc);
2319 return (m);
2320 }
2321
2322 eh = mtod(m, struct ether_header *);
2323
2324 bridge_span(sc, m);
2325
2326 if (m->m_flags & (M_BCAST|M_MCAST)) {
2327 /* Tap off 802.1D packets; they do not get forwarded. */
2328 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2329 ETHER_ADDR_LEN) == 0) {
2330 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2331 BRIDGE_UNLOCK(sc);
2332 return (NULL);
2333 }
2334
2335 if ((bif->bif_flags & IFBIF_STP) &&
2336 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2337 BRIDGE_UNLOCK(sc);
2338 return (m);
2339 }
2340
2341 /*
2342 * Make a deep copy of the packet and enqueue the copy
2343 * for bridge processing; return the original packet for
2344 * local processing.
2345 */
2346 mc = m_dup(m, M_NOWAIT);
2347 if (mc == NULL) {
2348 BRIDGE_UNLOCK(sc);
2349 return (m);
2350 }
2351
2352 /* Perform the bridge forwarding function with the copy. */
2353 bridge_forward(sc, bif, mc);
2354
2355 /*
2356 * Reinject the mbuf as arriving on the bridge so we have a
2357 * chance at claiming multicast packets. We can not loop back
2358 * here from ether_input as a bridge is never a member of a
2359 * bridge.
2360 */
2361 KASSERT(bifp->if_bridge == NULL,
2362 ("loop created in bridge_input"));
2363 mc2 = m_dup(m, M_NOWAIT);
2364 if (mc2 != NULL) {
2365 /* Keep the layer3 header aligned */
2366 int i = min(mc2->m_pkthdr.len, max_protohdr);
2367 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2368 }
2369 if (mc2 != NULL) {
2370 mc2->m_pkthdr.rcvif = bifp;
2371 (*bifp->if_input)(bifp, mc2);
2372 }
2373
2374 /* Return the original packet for local processing. */
2375 return (m);
2376 }
2377
2378 if ((bif->bif_flags & IFBIF_STP) &&
2379 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2380 BRIDGE_UNLOCK(sc);
2381 return (m);
2382 }
2383
2384 #if (defined(INET) || defined(INET6))
2385 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2386 || ((iface)->if_carp \
2387 && (*carp_forus_p)((iface), eh->ether_dhost))
2388 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2389 || ((iface)->if_carp \
2390 && (*carp_forus_p)((iface), eh->ether_shost))
2391 #else
2392 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2393 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2394 #endif
2395
2396 #ifdef INET6
2397 # define OR_PFIL_HOOKED_INET6 \
2398 || PFIL_HOOKED(&V_inet6_pfil_hook)
2399 #else
2400 # define OR_PFIL_HOOKED_INET6
2401 #endif
2402
2403 #define GRAB_OUR_PACKETS(iface) \
2404 if ((iface)->if_type == IFT_GIF) \
2405 continue; \
2406 /* It is destined for us. */ \
2407 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2408 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2409 ) { \
2410 if ((iface)->if_type == IFT_BRIDGE) { \
2411 ETHER_BPF_MTAP(iface, m); \
2412 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \
2413 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2414 /* Filter on the physical interface. */ \
2415 if (V_pfil_local_phys && \
2416 (PFIL_HOOKED(&V_inet_pfil_hook) \
2417 OR_PFIL_HOOKED_INET6)) { \
2418 if (bridge_pfil(&m, NULL, ifp, \
2419 PFIL_IN) != 0 || m == NULL) { \
2420 BRIDGE_UNLOCK(sc); \
2421 return (NULL); \
2422 } \
2423 eh = mtod(m, struct ether_header *); \
2424 } \
2425 } \
2426 if (bif->bif_flags & IFBIF_LEARNING) { \
2427 error = bridge_rtupdate(sc, eh->ether_shost, \
2428 vlan, bif, 0, IFBAF_DYNAMIC); \
2429 if (error && bif->bif_addrmax) { \
2430 BRIDGE_UNLOCK(sc); \
2431 m_freem(m); \
2432 return (NULL); \
2433 } \
2434 } \
2435 m->m_pkthdr.rcvif = iface; \
2436 BRIDGE_UNLOCK(sc); \
2437 return (m); \
2438 } \
2439 \
2440 /* We just received a packet that we sent out. */ \
2441 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2442 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2443 ) { \
2444 BRIDGE_UNLOCK(sc); \
2445 m_freem(m); \
2446 return (NULL); \
2447 }
2448
2449 /*
2450 * Unicast. Make sure it's not for the bridge.
2451 */
2452 do { GRAB_OUR_PACKETS(bifp) } while (0);
2453
2454 /*
2455 * Give a chance for ifp at first priority. This will help when the
2456 * packet comes through the interface like VLAN's with the same MACs
2457 * on several interfaces from the same bridge. This also will save
2458 * some CPU cycles in case the destination interface and the input
2459 * interface (eq ifp) are the same.
2460 */
2461 do { GRAB_OUR_PACKETS(ifp) } while (0);
2462
2463 /* Now check the all bridge members. */
2464 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2465 GRAB_OUR_PACKETS(bif2->bif_ifp)
2466 }
2467
2468 #undef OR_CARP_CHECK_WE_ARE_DST
2469 #undef OR_CARP_CHECK_WE_ARE_SRC
2470 #undef OR_PFIL_HOOKED_INET6
2471 #undef GRAB_OUR_PACKETS
2472
2473 /* Perform the bridge forwarding function. */
2474 bridge_forward(sc, bif, m);
2475
2476 return (NULL);
2477 }
2478
2479 /*
2480 * bridge_broadcast:
2481 *
2482 * Send a frame to all interfaces that are members of
2483 * the bridge, except for the one on which the packet
2484 * arrived.
2485 *
2486 * NOTE: Releases the lock on return.
2487 */
2488 static void
2489 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2490 struct mbuf *m, int runfilt)
2491 {
2492 struct bridge_iflist *dbif, *sbif;
2493 struct mbuf *mc;
2494 struct ifnet *dst_if;
2495 int error = 0, used = 0, i;
2496
2497 sbif = bridge_lookup_member_if(sc, src_if);
2498
2499 BRIDGE_LOCK2REF(sc, error);
2500 if (error) {
2501 m_freem(m);
2502 return;
2503 }
2504
2505 /* Filter on the bridge interface before broadcasting */
2506 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2507 #ifdef INET6
2508 || PFIL_HOOKED(&V_inet6_pfil_hook)
2509 #endif
2510 )) {
2511 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2512 goto out;
2513 if (m == NULL)
2514 goto out;
2515 }
2516
2517 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2518 dst_if = dbif->bif_ifp;
2519 if (dst_if == src_if)
2520 continue;
2521
2522 /* Private segments can not talk to each other */
2523 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2524 continue;
2525
2526 if ((dbif->bif_flags & IFBIF_STP) &&
2527 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2528 continue;
2529
2530 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2531 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2532 continue;
2533
2534 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2535 continue;
2536
2537 if (LIST_NEXT(dbif, bif_next) == NULL) {
2538 mc = m;
2539 used = 1;
2540 } else {
2541 mc = m_dup(m, M_NOWAIT);
2542 if (mc == NULL) {
2543 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2544 continue;
2545 }
2546 }
2547
2548 /*
2549 * Filter on the output interface. Pass a NULL bridge interface
2550 * pointer so we do not redundantly filter on the bridge for
2551 * each interface we broadcast on.
2552 */
2553 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2554 #ifdef INET6
2555 || PFIL_HOOKED(&V_inet6_pfil_hook)
2556 #endif
2557 )) {
2558 if (used == 0) {
2559 /* Keep the layer3 header aligned */
2560 i = min(mc->m_pkthdr.len, max_protohdr);
2561 mc = m_copyup(mc, i, ETHER_ALIGN);
2562 if (mc == NULL) {
2563 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2564 continue;
2565 }
2566 }
2567 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2568 continue;
2569 if (mc == NULL)
2570 continue;
2571 }
2572
2573 bridge_enqueue(sc, dst_if, mc);
2574 }
2575 if (used == 0)
2576 m_freem(m);
2577
2578 out:
2579 BRIDGE_UNREF(sc);
2580 }
2581
2582 /*
2583 * bridge_span:
2584 *
2585 * Duplicate a packet out one or more interfaces that are in span mode,
2586 * the original mbuf is unmodified.
2587 */
2588 static void
2589 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2590 {
2591 struct bridge_iflist *bif;
2592 struct ifnet *dst_if;
2593 struct mbuf *mc;
2594
2595 if (LIST_EMPTY(&sc->sc_spanlist))
2596 return;
2597
2598 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2599 dst_if = bif->bif_ifp;
2600
2601 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2602 continue;
2603
2604 mc = m_copypacket(m, M_NOWAIT);
2605 if (mc == NULL) {
2606 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2607 continue;
2608 }
2609
2610 bridge_enqueue(sc, dst_if, mc);
2611 }
2612 }
2613
2614 /*
2615 * bridge_rtupdate:
2616 *
2617 * Add a bridge routing entry.
2618 */
2619 static int
2620 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2621 struct bridge_iflist *bif, int setflags, uint8_t flags)
2622 {
2623 struct bridge_rtnode *brt;
2624 int error;
2625
2626 BRIDGE_LOCK_ASSERT(sc);
2627
2628 /* Check the source address is valid and not multicast. */
2629 if (ETHER_IS_MULTICAST(dst) ||
2630 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2631 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2632 return (EINVAL);
2633
2634 /* 802.1p frames map to vlan 1 */
2635 if (vlan == 0)
2636 vlan = 1;
2637
2638 /*
2639 * A route for this destination might already exist. If so,
2640 * update it, otherwise create a new one.
2641 */
2642 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2643 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2644 sc->sc_brtexceeded++;
2645 return (ENOSPC);
2646 }
2647 /* Check per interface address limits (if enabled) */
2648 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2649 bif->bif_addrexceeded++;
2650 return (ENOSPC);
2651 }
2652
2653 /*
2654 * Allocate a new bridge forwarding node, and
2655 * initialize the expiration time and Ethernet
2656 * address.
2657 */
2658 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2659 if (brt == NULL)
2660 return (ENOMEM);
2661
2662 if (bif->bif_flags & IFBIF_STICKY)
2663 brt->brt_flags = IFBAF_STICKY;
2664 else
2665 brt->brt_flags = IFBAF_DYNAMIC;
2666
2667 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2668 brt->brt_vlan = vlan;
2669
2670 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2671 uma_zfree(bridge_rtnode_zone, brt);
2672 return (error);
2673 }
2674 brt->brt_dst = bif;
2675 bif->bif_addrcnt++;
2676 }
2677
2678 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2679 brt->brt_dst != bif) {
2680 brt->brt_dst->bif_addrcnt--;
2681 brt->brt_dst = bif;
2682 brt->brt_dst->bif_addrcnt++;
2683 }
2684
2685 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2686 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2687 if (setflags)
2688 brt->brt_flags = flags;
2689
2690 return (0);
2691 }
2692
2693 /*
2694 * bridge_rtlookup:
2695 *
2696 * Lookup the destination interface for an address.
2697 */
2698 static struct ifnet *
2699 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2700 {
2701 struct bridge_rtnode *brt;
2702
2703 BRIDGE_LOCK_ASSERT(sc);
2704
2705 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2706 return (NULL);
2707
2708 return (brt->brt_ifp);
2709 }
2710
2711 /*
2712 * bridge_rttrim:
2713 *
2714 * Trim the routine table so that we have a number
2715 * of routing entries less than or equal to the
2716 * maximum number.
2717 */
2718 static void
2719 bridge_rttrim(struct bridge_softc *sc)
2720 {
2721 struct bridge_rtnode *brt, *nbrt;
2722
2723 BRIDGE_LOCK_ASSERT(sc);
2724
2725 /* Make sure we actually need to do this. */
2726 if (sc->sc_brtcnt <= sc->sc_brtmax)
2727 return;
2728
2729 /* Force an aging cycle; this might trim enough addresses. */
2730 bridge_rtage(sc);
2731 if (sc->sc_brtcnt <= sc->sc_brtmax)
2732 return;
2733
2734 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2735 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2736 bridge_rtnode_destroy(sc, brt);
2737 if (sc->sc_brtcnt <= sc->sc_brtmax)
2738 return;
2739 }
2740 }
2741 }
2742
2743 /*
2744 * bridge_timer:
2745 *
2746 * Aging timer for the bridge.
2747 */
2748 static void
2749 bridge_timer(void *arg)
2750 {
2751 struct bridge_softc *sc = arg;
2752
2753 BRIDGE_LOCK_ASSERT(sc);
2754
2755 bridge_rtage(sc);
2756
2757 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2758 callout_reset(&sc->sc_brcallout,
2759 bridge_rtable_prune_period * hz, bridge_timer, sc);
2760 }
2761
2762 /*
2763 * bridge_rtage:
2764 *
2765 * Perform an aging cycle.
2766 */
2767 static void
2768 bridge_rtage(struct bridge_softc *sc)
2769 {
2770 struct bridge_rtnode *brt, *nbrt;
2771
2772 BRIDGE_LOCK_ASSERT(sc);
2773
2774 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2775 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2776 if (time_uptime >= brt->brt_expire)
2777 bridge_rtnode_destroy(sc, brt);
2778 }
2779 }
2780 }
2781
2782 /*
2783 * bridge_rtflush:
2784 *
2785 * Remove all dynamic addresses from the bridge.
2786 */
2787 static void
2788 bridge_rtflush(struct bridge_softc *sc, int full)
2789 {
2790 struct bridge_rtnode *brt, *nbrt;
2791
2792 BRIDGE_LOCK_ASSERT(sc);
2793
2794 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2795 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2796 bridge_rtnode_destroy(sc, brt);
2797 }
2798 }
2799
2800 /*
2801 * bridge_rtdaddr:
2802 *
2803 * Remove an address from the table.
2804 */
2805 static int
2806 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2807 {
2808 struct bridge_rtnode *brt;
2809 int found = 0;
2810
2811 BRIDGE_LOCK_ASSERT(sc);
2812
2813 /*
2814 * If vlan is zero then we want to delete for all vlans so the lookup
2815 * may return more than one.
2816 */
2817 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2818 bridge_rtnode_destroy(sc, brt);
2819 found = 1;
2820 }
2821
2822 return (found ? 0 : ENOENT);
2823 }
2824
2825 /*
2826 * bridge_rtdelete:
2827 *
2828 * Delete routes to a speicifc member interface.
2829 */
2830 static void
2831 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2832 {
2833 struct bridge_rtnode *brt, *nbrt;
2834
2835 BRIDGE_LOCK_ASSERT(sc);
2836
2837 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2838 if (brt->brt_ifp == ifp && (full ||
2839 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2840 bridge_rtnode_destroy(sc, brt);
2841 }
2842 }
2843
2844 /*
2845 * bridge_rtable_init:
2846 *
2847 * Initialize the route table for this bridge.
2848 */
2849 static void
2850 bridge_rtable_init(struct bridge_softc *sc)
2851 {
2852 int i;
2853
2854 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2855 M_DEVBUF, M_WAITOK);
2856
2857 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2858 LIST_INIT(&sc->sc_rthash[i]);
2859
2860 sc->sc_rthash_key = arc4random();
2861 LIST_INIT(&sc->sc_rtlist);
2862 }
2863
2864 /*
2865 * bridge_rtable_fini:
2866 *
2867 * Deconstruct the route table for this bridge.
2868 */
2869 static void
2870 bridge_rtable_fini(struct bridge_softc *sc)
2871 {
2872
2873 KASSERT(sc->sc_brtcnt == 0,
2874 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2875 free(sc->sc_rthash, M_DEVBUF);
2876 }
2877
2878 /*
2879 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2880 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2881 */
2882 #define mix(a, b, c) \
2883 do { \
2884 a -= b; a -= c; a ^= (c >> 13); \
2885 b -= c; b -= a; b ^= (a << 8); \
2886 c -= a; c -= b; c ^= (b >> 13); \
2887 a -= b; a -= c; a ^= (c >> 12); \
2888 b -= c; b -= a; b ^= (a << 16); \
2889 c -= a; c -= b; c ^= (b >> 5); \
2890 a -= b; a -= c; a ^= (c >> 3); \
2891 b -= c; b -= a; b ^= (a << 10); \
2892 c -= a; c -= b; c ^= (b >> 15); \
2893 } while (/*CONSTCOND*/0)
2894
2895 static __inline uint32_t
2896 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2897 {
2898 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2899
2900 b += addr[5] << 8;
2901 b += addr[4];
2902 a += addr[3] << 24;
2903 a += addr[2] << 16;
2904 a += addr[1] << 8;
2905 a += addr[0];
2906
2907 mix(a, b, c);
2908
2909 return (c & BRIDGE_RTHASH_MASK);
2910 }
2911
2912 #undef mix
2913
2914 static int
2915 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2916 {
2917 int i, d;
2918
2919 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2920 d = ((int)a[i]) - ((int)b[i]);
2921 }
2922
2923 return (d);
2924 }
2925
2926 /*
2927 * bridge_rtnode_lookup:
2928 *
2929 * Look up a bridge route node for the specified destination. Compare the
2930 * vlan id or if zero then just return the first match.
2931 */
2932 static struct bridge_rtnode *
2933 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2934 {
2935 struct bridge_rtnode *brt;
2936 uint32_t hash;
2937 int dir;
2938
2939 BRIDGE_LOCK_ASSERT(sc);
2940
2941 hash = bridge_rthash(sc, addr);
2942 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2943 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2944 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2945 return (brt);
2946 if (dir > 0)
2947 return (NULL);
2948 }
2949
2950 return (NULL);
2951 }
2952
2953 /*
2954 * bridge_rtnode_insert:
2955 *
2956 * Insert the specified bridge node into the route table. We
2957 * assume the entry is not already in the table.
2958 */
2959 static int
2960 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2961 {
2962 struct bridge_rtnode *lbrt;
2963 uint32_t hash;
2964 int dir;
2965
2966 BRIDGE_LOCK_ASSERT(sc);
2967
2968 hash = bridge_rthash(sc, brt->brt_addr);
2969
2970 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2971 if (lbrt == NULL) {
2972 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2973 goto out;
2974 }
2975
2976 do {
2977 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2978 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2979 return (EEXIST);
2980 if (dir > 0) {
2981 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2982 goto out;
2983 }
2984 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2985 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2986 goto out;
2987 }
2988 lbrt = LIST_NEXT(lbrt, brt_hash);
2989 } while (lbrt != NULL);
2990
2991 #ifdef DIAGNOSTIC
2992 panic("bridge_rtnode_insert: impossible");
2993 #endif
2994
2995 out:
2996 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2997 sc->sc_brtcnt++;
2998
2999 return (0);
3000 }
3001
3002 /*
3003 * bridge_rtnode_destroy:
3004 *
3005 * Destroy a bridge rtnode.
3006 */
3007 static void
3008 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3009 {
3010 BRIDGE_LOCK_ASSERT(sc);
3011
3012 LIST_REMOVE(brt, brt_hash);
3013
3014 LIST_REMOVE(brt, brt_list);
3015 sc->sc_brtcnt--;
3016 brt->brt_dst->bif_addrcnt--;
3017 uma_zfree(bridge_rtnode_zone, brt);
3018 }
3019
3020 /*
3021 * bridge_rtable_expire:
3022 *
3023 * Set the expiry time for all routes on an interface.
3024 */
3025 static void
3026 bridge_rtable_expire(struct ifnet *ifp, int age)
3027 {
3028 struct bridge_softc *sc = ifp->if_bridge;
3029 struct bridge_rtnode *brt;
3030
3031 BRIDGE_LOCK(sc);
3032
3033 /*
3034 * If the age is zero then flush, otherwise set all the expiry times to
3035 * age for the interface
3036 */
3037 if (age == 0)
3038 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3039 else {
3040 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3041 /* Cap the expiry time to 'age' */
3042 if (brt->brt_ifp == ifp &&
3043 brt->brt_expire > time_uptime + age &&
3044 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3045 brt->brt_expire = time_uptime + age;
3046 }
3047 }
3048 BRIDGE_UNLOCK(sc);
3049 }
3050
3051 /*
3052 * bridge_state_change:
3053 *
3054 * Callback from the bridgestp code when a port changes states.
3055 */
3056 static void
3057 bridge_state_change(struct ifnet *ifp, int state)
3058 {
3059 struct bridge_softc *sc = ifp->if_bridge;
3060 static const char *stpstates[] = {
3061 "disabled",
3062 "listening",
3063 "learning",
3064 "forwarding",
3065 "blocking",
3066 "discarding"
3067 };
3068
3069 CURVNET_SET(ifp->if_vnet);
3070 if (V_log_stp)
3071 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3072 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3073 CURVNET_RESTORE();
3074 }
3075
3076 /*
3077 * Send bridge packets through pfil if they are one of the types pfil can deal
3078 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3079 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3080 * that interface.
3081 */
3082 static int
3083 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3084 {
3085 int snap, error, i, hlen;
3086 struct ether_header *eh1, eh2;
3087 struct ip *ip;
3088 struct llc llc1;
3089 u_int16_t ether_type;
3090
3091 snap = 0;
3092 error = -1; /* Default error if not error == 0 */
3093
3094 #if 0
3095 /* we may return with the IP fields swapped, ensure its not shared */
3096 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3097 #endif
3098
3099 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3100 return (0); /* filtering is disabled */
3101
3102 i = min((*mp)->m_pkthdr.len, max_protohdr);
3103 if ((*mp)->m_len < i) {
3104 *mp = m_pullup(*mp, i);
3105 if (*mp == NULL) {
3106 printf("%s: m_pullup failed\n", __func__);
3107 return (-1);
3108 }
3109 }
3110
3111 eh1 = mtod(*mp, struct ether_header *);
3112 ether_type = ntohs(eh1->ether_type);
3113
3114 /*
3115 * Check for SNAP/LLC.
3116 */
3117 if (ether_type < ETHERMTU) {
3118 struct llc *llc2 = (struct llc *)(eh1 + 1);
3119
3120 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3121 llc2->llc_dsap == LLC_SNAP_LSAP &&
3122 llc2->llc_ssap == LLC_SNAP_LSAP &&
3123 llc2->llc_control == LLC_UI) {
3124 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3125 snap = 1;
3126 }
3127 }
3128
3129 /*
3130 * If we're trying to filter bridge traffic, don't look at anything
3131 * other than IP and ARP traffic. If the filter doesn't understand
3132 * IPv6, don't allow IPv6 through the bridge either. This is lame
3133 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3134 * but of course we don't have an AppleTalk filter to begin with.
3135 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3136 * ARP traffic.)
3137 */
3138 switch (ether_type) {
3139 case ETHERTYPE_ARP:
3140 case ETHERTYPE_REVARP:
3141 if (V_pfil_ipfw_arp == 0)
3142 return (0); /* Automatically pass */
3143 break;
3144
3145 case ETHERTYPE_IP:
3146 #ifdef INET6
3147 case ETHERTYPE_IPV6:
3148 #endif /* INET6 */
3149 break;
3150 default:
3151 /*
3152 * Check to see if the user wants to pass non-ip
3153 * packets, these will not be checked by pfil(9) and
3154 * passed unconditionally so the default is to drop.
3155 */
3156 if (V_pfil_onlyip)
3157 goto bad;
3158 }
3159
3160 /* Run the packet through pfil before stripping link headers */
3161 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
3162 dir == PFIL_OUT && ifp != NULL) {
3163
3164 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3165
3166 if (*mp == NULL || error != 0) /* packet consumed by filter */
3167 return (error);
3168 }
3169
3170 /* Strip off the Ethernet header and keep a copy. */
3171 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3172 m_adj(*mp, ETHER_HDR_LEN);
3173
3174 /* Strip off snap header, if present */
3175 if (snap) {
3176 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3177 m_adj(*mp, sizeof(struct llc));
3178 }
3179
3180 /*
3181 * Check the IP header for alignment and errors
3182 */
3183 if (dir == PFIL_IN) {
3184 switch (ether_type) {
3185 case ETHERTYPE_IP:
3186 error = bridge_ip_checkbasic(mp);
3187 break;
3188 #ifdef INET6
3189 case ETHERTYPE_IPV6:
3190 error = bridge_ip6_checkbasic(mp);
3191 break;
3192 #endif /* INET6 */
3193 default:
3194 error = 0;
3195 }
3196 if (error)
3197 goto bad;
3198 }
3199
3200 error = 0;
3201
3202 /*
3203 * Run the packet through pfil
3204 */
3205 switch (ether_type) {
3206 case ETHERTYPE_IP:
3207 /*
3208 * Run pfil on the member interface and the bridge, both can
3209 * be skipped by clearing pfil_member or pfil_bridge.
3210 *
3211 * Keep the order:
3212 * in_if -> bridge_if -> out_if
3213 */
3214 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3215 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3216 dir, NULL);
3217
3218 if (*mp == NULL || error != 0) /* filter may consume */
3219 break;
3220
3221 if (V_pfil_member && ifp != NULL)
3222 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3223 dir, NULL);
3224
3225 if (*mp == NULL || error != 0) /* filter may consume */
3226 break;
3227
3228 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3229 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3230 dir, NULL);
3231
3232 if (*mp == NULL || error != 0) /* filter may consume */
3233 break;
3234
3235 /* check if we need to fragment the packet */
3236 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3237 i = (*mp)->m_pkthdr.len;
3238 if (i > ifp->if_mtu) {
3239 error = bridge_fragment(ifp, *mp, &eh2, snap,
3240 &llc1);
3241 return (error);
3242 }
3243 }
3244
3245 /* Recalculate the ip checksum. */
3246 ip = mtod(*mp, struct ip *);
3247 hlen = ip->ip_hl << 2;
3248 if (hlen < sizeof(struct ip))
3249 goto bad;
3250 if (hlen > (*mp)->m_len) {
3251 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3252 goto bad;
3253 ip = mtod(*mp, struct ip *);
3254 if (ip == NULL)
3255 goto bad;
3256 }
3257 ip->ip_sum = 0;
3258 if (hlen == sizeof(struct ip))
3259 ip->ip_sum = in_cksum_hdr(ip);
3260 else
3261 ip->ip_sum = in_cksum(*mp, hlen);
3262
3263 break;
3264 #ifdef INET6
3265 case ETHERTYPE_IPV6:
3266 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3267 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3268 dir, NULL);
3269
3270 if (*mp == NULL || error != 0) /* filter may consume */
3271 break;
3272
3273 if (V_pfil_member && ifp != NULL)
3274 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3275 dir, NULL);
3276
3277 if (*mp == NULL || error != 0) /* filter may consume */
3278 break;
3279
3280 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3281 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3282 dir, NULL);
3283 break;
3284 #endif
3285 default:
3286 error = 0;
3287 break;
3288 }
3289
3290 if (*mp == NULL)
3291 return (error);
3292 if (error != 0)
3293 goto bad;
3294
3295 error = -1;
3296
3297 /*
3298 * Finally, put everything back the way it was and return
3299 */
3300 if (snap) {
3301 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3302 if (*mp == NULL)
3303 return (error);
3304 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3305 }
3306
3307 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3308 if (*mp == NULL)
3309 return (error);
3310 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3311
3312 return (0);
3313
3314 bad:
3315 m_freem(*mp);
3316 *mp = NULL;
3317 return (error);
3318 }
3319
3320 /*
3321 * Perform basic checks on header size since
3322 * pfil assumes ip_input has already processed
3323 * it for it. Cut-and-pasted from ip_input.c.
3324 * Given how simple the IPv6 version is,
3325 * does the IPv4 version really need to be
3326 * this complicated?
3327 *
3328 * XXX Should we update ipstat here, or not?
3329 * XXX Right now we update ipstat but not
3330 * XXX csum_counter.
3331 */
3332 static int
3333 bridge_ip_checkbasic(struct mbuf **mp)
3334 {
3335 struct mbuf *m = *mp;
3336 struct ip *ip;
3337 int len, hlen;
3338 u_short sum;
3339
3340 if (*mp == NULL)
3341 return (-1);
3342
3343 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3344 if ((m = m_copyup(m, sizeof(struct ip),
3345 (max_linkhdr + 3) & ~3)) == NULL) {
3346 /* XXXJRT new stat, please */
3347 KMOD_IPSTAT_INC(ips_toosmall);
3348 goto bad;
3349 }
3350 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3351 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3352 KMOD_IPSTAT_INC(ips_toosmall);
3353 goto bad;
3354 }
3355 }
3356 ip = mtod(m, struct ip *);
3357 if (ip == NULL) goto bad;
3358
3359 if (ip->ip_v != IPVERSION) {
3360 KMOD_IPSTAT_INC(ips_badvers);
3361 goto bad;
3362 }
3363 hlen = ip->ip_hl << 2;
3364 if (hlen < sizeof(struct ip)) { /* minimum header length */
3365 KMOD_IPSTAT_INC(ips_badhlen);
3366 goto bad;
3367 }
3368 if (hlen > m->m_len) {
3369 if ((m = m_pullup(m, hlen)) == NULL) {
3370 KMOD_IPSTAT_INC(ips_badhlen);
3371 goto bad;
3372 }
3373 ip = mtod(m, struct ip *);
3374 if (ip == NULL) goto bad;
3375 }
3376
3377 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3378 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3379 } else {
3380 if (hlen == sizeof(struct ip)) {
3381 sum = in_cksum_hdr(ip);
3382 } else {
3383 sum = in_cksum(m, hlen);
3384 }
3385 }
3386 if (sum) {
3387 KMOD_IPSTAT_INC(ips_badsum);
3388 goto bad;
3389 }
3390
3391 /* Retrieve the packet length. */
3392 len = ntohs(ip->ip_len);
3393
3394 /*
3395 * Check for additional length bogosity
3396 */
3397 if (len < hlen) {
3398 KMOD_IPSTAT_INC(ips_badlen);
3399 goto bad;
3400 }
3401
3402 /*
3403 * Check that the amount of data in the buffers
3404 * is as at least much as the IP header would have us expect.
3405 * Drop packet if shorter than we expect.
3406 */
3407 if (m->m_pkthdr.len < len) {
3408 KMOD_IPSTAT_INC(ips_tooshort);
3409 goto bad;
3410 }
3411
3412 /* Checks out, proceed */
3413 *mp = m;
3414 return (0);
3415
3416 bad:
3417 *mp = m;
3418 return (-1);
3419 }
3420
3421 #ifdef INET6
3422 /*
3423 * Same as above, but for IPv6.
3424 * Cut-and-pasted from ip6_input.c.
3425 * XXX Should we update ip6stat, or not?
3426 */
3427 static int
3428 bridge_ip6_checkbasic(struct mbuf **mp)
3429 {
3430 struct mbuf *m = *mp;
3431 struct ip6_hdr *ip6;
3432
3433 /*
3434 * If the IPv6 header is not aligned, slurp it up into a new
3435 * mbuf with space for link headers, in the event we forward
3436 * it. Otherwise, if it is aligned, make sure the entire base
3437 * IPv6 header is in the first mbuf of the chain.
3438 */
3439 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3440 struct ifnet *inifp = m->m_pkthdr.rcvif;
3441 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3442 (max_linkhdr + 3) & ~3)) == NULL) {
3443 /* XXXJRT new stat, please */
3444 IP6STAT_INC(ip6s_toosmall);
3445 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3446 goto bad;
3447 }
3448 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3449 struct ifnet *inifp = m->m_pkthdr.rcvif;
3450 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3451 IP6STAT_INC(ip6s_toosmall);
3452 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3453 goto bad;
3454 }
3455 }
3456
3457 ip6 = mtod(m, struct ip6_hdr *);
3458
3459 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3460 IP6STAT_INC(ip6s_badvers);
3461 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3462 goto bad;
3463 }
3464
3465 /* Checks out, proceed */
3466 *mp = m;
3467 return (0);
3468
3469 bad:
3470 *mp = m;
3471 return (-1);
3472 }
3473 #endif /* INET6 */
3474
3475 /*
3476 * bridge_fragment:
3477 *
3478 * Return a fragmented mbuf chain.
3479 */
3480 static int
3481 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3482 int snap, struct llc *llc)
3483 {
3484 struct mbuf *m0;
3485 struct ip *ip;
3486 int error = -1;
3487
3488 if (m->m_len < sizeof(struct ip) &&
3489 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3490 goto out;
3491 ip = mtod(m, struct ip *);
3492
3493 m->m_pkthdr.csum_flags |= CSUM_IP;
3494 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3495 if (error)
3496 goto out;
3497
3498 /* walk the chain and re-add the Ethernet header */
3499 for (m0 = m; m0; m0 = m0->m_nextpkt) {
3500 if (error == 0) {
3501 if (snap) {
3502 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT);
3503 if (m0 == NULL) {
3504 error = ENOBUFS;
3505 continue;
3506 }
3507 bcopy(llc, mtod(m0, caddr_t),
3508 sizeof(struct llc));
3509 }
3510 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT);
3511 if (m0 == NULL) {
3512 error = ENOBUFS;
3513 continue;
3514 }
3515 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3516 } else
3517 m_freem(m);
3518 }
3519
3520 if (error == 0)
3521 KMOD_IPSTAT_INC(ips_fragmented);
3522
3523 return (error);
3524
3525 out:
3526 if (m != NULL)
3527 m_freem(m);
3528 return (error);
3529 }
3530
3531 static void
3532 bridge_linkstate(struct ifnet *ifp)
3533 {
3534 struct bridge_softc *sc = ifp->if_bridge;
3535 struct bridge_iflist *bif;
3536
3537 BRIDGE_LOCK(sc);
3538 bif = bridge_lookup_member_if(sc, ifp);
3539 if (bif == NULL) {
3540 BRIDGE_UNLOCK(sc);
3541 return;
3542 }
3543 bridge_linkcheck(sc);
3544 BRIDGE_UNLOCK(sc);
3545
3546 bstp_linkstate(&bif->bif_stp);
3547 }
3548
3549 static void
3550 bridge_linkcheck(struct bridge_softc *sc)
3551 {
3552 struct bridge_iflist *bif;
3553 int new_link, hasls;
3554
3555 BRIDGE_LOCK_ASSERT(sc);
3556 new_link = LINK_STATE_DOWN;
3557 hasls = 0;
3558 /* Our link is considered up if at least one of our ports is active */
3559 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3560 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3561 hasls++;
3562 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3563 new_link = LINK_STATE_UP;
3564 break;
3565 }
3566 }
3567 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3568 /* If no interfaces support link-state then we default to up */
3569 new_link = LINK_STATE_UP;
3570 }
3571 if_link_state_change(sc->sc_ifp, new_link);
3572 }
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