FreeBSD/Linux Kernel Cross Reference
sys/net/if_bridge.c
1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright 2001 Wasabi Systems, Inc.
7 * All rights reserved.
8 *
9 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed for the NetBSD Project by
22 * Wasabi Systems, Inc.
23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
24 * or promote products derived from this software without specific prior
25 * written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 /*
41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
42 * All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
63 * POSSIBILITY OF SUCH DAMAGE.
64 *
65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
66 */
67
68 /*
69 * Network interface bridge support.
70 *
71 * TODO:
72 *
73 * - Currently only supports Ethernet-like interfaces (Ethernet,
74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
75 * to bridge other types of interfaces (maybe consider
76 * heterogeneous bridges).
77 */
78
79 #include <sys/cdefs.h>
80 __FBSDID("$FreeBSD: releng/12.0/sys/net/if_bridge.c 336676 2018-07-24 16:35:52Z andrew $");
81
82 #include "opt_inet.h"
83 #include "opt_inet6.h"
84
85 #include <sys/param.h>
86 #include <sys/eventhandler.h>
87 #include <sys/mbuf.h>
88 #include <sys/malloc.h>
89 #include <sys/protosw.h>
90 #include <sys/systm.h>
91 #include <sys/jail.h>
92 #include <sys/time.h>
93 #include <sys/socket.h> /* for net/if.h */
94 #include <sys/sockio.h>
95 #include <sys/ctype.h> /* string functions */
96 #include <sys/kernel.h>
97 #include <sys/random.h>
98 #include <sys/syslog.h>
99 #include <sys/sysctl.h>
100 #include <vm/uma.h>
101 #include <sys/module.h>
102 #include <sys/priv.h>
103 #include <sys/proc.h>
104 #include <sys/lock.h>
105 #include <sys/mutex.h>
106
107 #include <net/bpf.h>
108 #include <net/if.h>
109 #include <net/if_clone.h>
110 #include <net/if_dl.h>
111 #include <net/if_types.h>
112 #include <net/if_var.h>
113 #include <net/pfil.h>
114 #include <net/vnet.h>
115
116 #include <netinet/in.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
121 #ifdef INET6
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
124 #include <netinet6/in6_ifattach.h>
125 #endif
126 #if defined(INET) || defined(INET6)
127 #include <netinet/ip_carp.h>
128 #endif
129 #include <machine/in_cksum.h>
130 #include <netinet/if_ether.h>
131 #include <net/bridgestp.h>
132 #include <net/if_bridgevar.h>
133 #include <net/if_llc.h>
134 #include <net/if_vlan_var.h>
135
136 #include <net/route.h>
137
138 /*
139 * Size of the route hash table. Must be a power of two.
140 */
141 #ifndef BRIDGE_RTHASH_SIZE
142 #define BRIDGE_RTHASH_SIZE 1024
143 #endif
144
145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
146
147 /*
148 * Default maximum number of addresses to cache.
149 */
150 #ifndef BRIDGE_RTABLE_MAX
151 #define BRIDGE_RTABLE_MAX 2000
152 #endif
153
154 /*
155 * Timeout (in seconds) for entries learned dynamically.
156 */
157 #ifndef BRIDGE_RTABLE_TIMEOUT
158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
159 #endif
160
161 /*
162 * Number of seconds between walks of the route list.
163 */
164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
166 #endif
167
168 /*
169 * List of capabilities to possibly mask on the member interface.
170 */
171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
172 IFCAP_TXCSUM_IPV6)
173
174 /*
175 * List of capabilities to strip
176 */
177 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
178
179 /*
180 * Bridge interface list entry.
181 */
182 struct bridge_iflist {
183 LIST_ENTRY(bridge_iflist) bif_next;
184 struct ifnet *bif_ifp; /* member if */
185 struct bstp_port bif_stp; /* STP state */
186 uint32_t bif_flags; /* member if flags */
187 int bif_savedcaps; /* saved capabilities */
188 uint32_t bif_addrmax; /* max # of addresses */
189 uint32_t bif_addrcnt; /* cur. # of addresses */
190 uint32_t bif_addrexceeded;/* # of address violations */
191 };
192
193 /*
194 * Bridge route node.
195 */
196 struct bridge_rtnode {
197 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
198 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
199 struct bridge_iflist *brt_dst; /* destination if */
200 unsigned long brt_expire; /* expiration time */
201 uint8_t brt_flags; /* address flags */
202 uint8_t brt_addr[ETHER_ADDR_LEN];
203 uint16_t brt_vlan; /* vlan id */
204 };
205 #define brt_ifp brt_dst->bif_ifp
206
207 /*
208 * Software state for each bridge.
209 */
210 struct bridge_softc {
211 struct ifnet *sc_ifp; /* make this an interface */
212 LIST_ENTRY(bridge_softc) sc_list;
213 struct mtx sc_mtx;
214 struct cv sc_cv;
215 uint32_t sc_brtmax; /* max # of addresses */
216 uint32_t sc_brtcnt; /* cur. # of addresses */
217 uint32_t sc_brttimeout; /* rt timeout in seconds */
218 struct callout sc_brcallout; /* bridge callout */
219 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
220 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
221 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
222 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
223 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
224 uint32_t sc_rthash_key; /* key for hash */
225 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
226 struct bstp_state sc_stp; /* STP state */
227 uint32_t sc_brtexceeded; /* # of cache drops */
228 struct ifnet *sc_ifaddr; /* member mac copied from */
229 u_char sc_defaddr[6]; /* Default MAC address */
230 };
231
232 VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
233 #define V_bridge_list_mtx VNET(bridge_list_mtx)
234 static eventhandler_tag bridge_detach_cookie;
235
236 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
237
238 uma_zone_t bridge_rtnode_zone;
239
240 static int bridge_clone_create(struct if_clone *, int, caddr_t);
241 static void bridge_clone_destroy(struct ifnet *);
242
243 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
244 static void bridge_mutecaps(struct bridge_softc *);
245 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
246 int);
247 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
248 static void bridge_init(void *);
249 static void bridge_dummynet(struct mbuf *, struct ifnet *);
250 static void bridge_stop(struct ifnet *, int);
251 static int bridge_transmit(struct ifnet *, struct mbuf *);
252 static void bridge_qflush(struct ifnet *);
253 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
254 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
255 struct rtentry *);
256 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
257 struct mbuf *);
258 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
259
260 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
261 struct mbuf *m);
262
263 static void bridge_timer(void *);
264
265 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
266 struct mbuf *, int);
267 static void bridge_span(struct bridge_softc *, struct mbuf *);
268
269 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
270 uint16_t, struct bridge_iflist *, int, uint8_t);
271 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
272 uint16_t);
273 static void bridge_rttrim(struct bridge_softc *);
274 static void bridge_rtage(struct bridge_softc *);
275 static void bridge_rtflush(struct bridge_softc *, int);
276 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
277 uint16_t);
278
279 static void bridge_rtable_init(struct bridge_softc *);
280 static void bridge_rtable_fini(struct bridge_softc *);
281
282 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
283 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
284 const uint8_t *, uint16_t);
285 static int bridge_rtnode_insert(struct bridge_softc *,
286 struct bridge_rtnode *);
287 static void bridge_rtnode_destroy(struct bridge_softc *,
288 struct bridge_rtnode *);
289 static void bridge_rtable_expire(struct ifnet *, int);
290 static void bridge_state_change(struct ifnet *, int);
291
292 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
293 const char *name);
294 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
295 struct ifnet *ifp);
296 static void bridge_delete_member(struct bridge_softc *,
297 struct bridge_iflist *, int);
298 static void bridge_delete_span(struct bridge_softc *,
299 struct bridge_iflist *);
300
301 static int bridge_ioctl_add(struct bridge_softc *, void *);
302 static int bridge_ioctl_del(struct bridge_softc *, void *);
303 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
304 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
305 static int bridge_ioctl_scache(struct bridge_softc *, void *);
306 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
307 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
308 static int bridge_ioctl_rts(struct bridge_softc *, void *);
309 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
310 static int bridge_ioctl_sto(struct bridge_softc *, void *);
311 static int bridge_ioctl_gto(struct bridge_softc *, void *);
312 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
313 static int bridge_ioctl_flush(struct bridge_softc *, void *);
314 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
315 static int bridge_ioctl_spri(struct bridge_softc *, void *);
316 static int bridge_ioctl_ght(struct bridge_softc *, void *);
317 static int bridge_ioctl_sht(struct bridge_softc *, void *);
318 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
319 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
320 static int bridge_ioctl_gma(struct bridge_softc *, void *);
321 static int bridge_ioctl_sma(struct bridge_softc *, void *);
322 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
323 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
324 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
325 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
326 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
327 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
328 static int bridge_ioctl_grte(struct bridge_softc *, void *);
329 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
330 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
331 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
332 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
333 int);
334 static int bridge_ip_checkbasic(struct mbuf **mp);
335 #ifdef INET6
336 static int bridge_ip6_checkbasic(struct mbuf **mp);
337 #endif /* INET6 */
338 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
339 struct ether_header *, int, struct llc *);
340 static void bridge_linkstate(struct ifnet *ifp);
341 static void bridge_linkcheck(struct bridge_softc *sc);
342
343
344 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
345 #define VLANTAGOF(_m) \
346 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
347
348 static struct bstp_cb_ops bridge_ops = {
349 .bcb_state = bridge_state_change,
350 .bcb_rtage = bridge_rtable_expire
351 };
352
353 SYSCTL_DECL(_net_link);
354 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
355
356 /* only pass IP[46] packets when pfil is enabled */
357 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
358 #define V_pfil_onlyip VNET(pfil_onlyip)
359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
360 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
361 "Only pass IP packets when pfil is enabled");
362
363 /* run pfil hooks on the bridge interface */
364 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
365 #define V_pfil_bridge VNET(pfil_bridge)
366 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
367 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
368 "Packet filter on the bridge interface");
369
370 /* layer2 filter with ipfw */
371 VNET_DEFINE_STATIC(int, pfil_ipfw);
372 #define V_pfil_ipfw VNET(pfil_ipfw)
373
374 /* layer2 ARP filter with ipfw */
375 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
376 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
377 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
378 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
379 "Filter ARP packets through IPFW layer2");
380
381 /* run pfil hooks on the member interface */
382 VNET_DEFINE_STATIC(int, pfil_member) = 1;
383 #define V_pfil_member VNET(pfil_member)
384 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
385 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
386 "Packet filter on the member interface");
387
388 /* run pfil hooks on the physical interface for locally destined packets */
389 VNET_DEFINE_STATIC(int, pfil_local_phys);
390 #define V_pfil_local_phys VNET(pfil_local_phys)
391 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
392 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
393 "Packet filter on the physical interface for locally destined packets");
394
395 /* log STP state changes */
396 VNET_DEFINE_STATIC(int, log_stp);
397 #define V_log_stp VNET(log_stp)
398 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
399 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
400 "Log STP state changes");
401
402 /* share MAC with first bridge member */
403 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
404 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
405 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
406 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
407 "Inherit MAC address from the first bridge member");
408
409 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
410 #define V_allow_llz_overlap VNET(allow_llz_overlap)
411 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
412 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
413 "Allow overlap of link-local scope "
414 "zones of a bridge interface and the member interfaces");
415
416 struct bridge_control {
417 int (*bc_func)(struct bridge_softc *, void *);
418 int bc_argsize;
419 int bc_flags;
420 };
421
422 #define BC_F_COPYIN 0x01 /* copy arguments in */
423 #define BC_F_COPYOUT 0x02 /* copy arguments out */
424 #define BC_F_SUSER 0x04 /* do super-user check */
425
426 const struct bridge_control bridge_control_table[] = {
427 { bridge_ioctl_add, sizeof(struct ifbreq),
428 BC_F_COPYIN|BC_F_SUSER },
429 { bridge_ioctl_del, sizeof(struct ifbreq),
430 BC_F_COPYIN|BC_F_SUSER },
431
432 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
433 BC_F_COPYIN|BC_F_COPYOUT },
434 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
435 BC_F_COPYIN|BC_F_SUSER },
436
437 { bridge_ioctl_scache, sizeof(struct ifbrparam),
438 BC_F_COPYIN|BC_F_SUSER },
439 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
440 BC_F_COPYOUT },
441
442 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
443 BC_F_COPYIN|BC_F_COPYOUT },
444 { bridge_ioctl_rts, sizeof(struct ifbaconf),
445 BC_F_COPYIN|BC_F_COPYOUT },
446
447 { bridge_ioctl_saddr, sizeof(struct ifbareq),
448 BC_F_COPYIN|BC_F_SUSER },
449
450 { bridge_ioctl_sto, sizeof(struct ifbrparam),
451 BC_F_COPYIN|BC_F_SUSER },
452 { bridge_ioctl_gto, sizeof(struct ifbrparam),
453 BC_F_COPYOUT },
454
455 { bridge_ioctl_daddr, sizeof(struct ifbareq),
456 BC_F_COPYIN|BC_F_SUSER },
457
458 { bridge_ioctl_flush, sizeof(struct ifbreq),
459 BC_F_COPYIN|BC_F_SUSER },
460
461 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
462 BC_F_COPYOUT },
463 { bridge_ioctl_spri, sizeof(struct ifbrparam),
464 BC_F_COPYIN|BC_F_SUSER },
465
466 { bridge_ioctl_ght, sizeof(struct ifbrparam),
467 BC_F_COPYOUT },
468 { bridge_ioctl_sht, sizeof(struct ifbrparam),
469 BC_F_COPYIN|BC_F_SUSER },
470
471 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
472 BC_F_COPYOUT },
473 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
474 BC_F_COPYIN|BC_F_SUSER },
475
476 { bridge_ioctl_gma, sizeof(struct ifbrparam),
477 BC_F_COPYOUT },
478 { bridge_ioctl_sma, sizeof(struct ifbrparam),
479 BC_F_COPYIN|BC_F_SUSER },
480
481 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
482 BC_F_COPYIN|BC_F_SUSER },
483
484 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
485 BC_F_COPYIN|BC_F_SUSER },
486
487 { bridge_ioctl_addspan, sizeof(struct ifbreq),
488 BC_F_COPYIN|BC_F_SUSER },
489 { bridge_ioctl_delspan, sizeof(struct ifbreq),
490 BC_F_COPYIN|BC_F_SUSER },
491
492 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
493 BC_F_COPYOUT },
494
495 { bridge_ioctl_grte, sizeof(struct ifbrparam),
496 BC_F_COPYOUT },
497
498 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
499 BC_F_COPYIN|BC_F_COPYOUT },
500
501 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
502 BC_F_COPYIN|BC_F_SUSER },
503
504 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
505 BC_F_COPYIN|BC_F_SUSER },
506
507 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
508 BC_F_COPYIN|BC_F_SUSER },
509
510 };
511 const int bridge_control_table_size = nitems(bridge_control_table);
512
513 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
514 #define V_bridge_list VNET(bridge_list)
515 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
516 "if_bridge list", NULL, MTX_DEF)
517 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
518 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
519 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
520
521 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
522 #define V_bridge_cloner VNET(bridge_cloner)
523
524 static const char bridge_name[] = "bridge";
525
526 static void
527 vnet_bridge_init(const void *unused __unused)
528 {
529
530 BRIDGE_LIST_LOCK_INIT();
531 LIST_INIT(&V_bridge_list);
532 V_bridge_cloner = if_clone_simple(bridge_name,
533 bridge_clone_create, bridge_clone_destroy, 0);
534 }
535 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
536 vnet_bridge_init, NULL);
537
538 static void
539 vnet_bridge_uninit(const void *unused __unused)
540 {
541
542 if_clone_detach(V_bridge_cloner);
543 V_bridge_cloner = NULL;
544 BRIDGE_LIST_LOCK_DESTROY();
545 }
546 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
547 vnet_bridge_uninit, NULL);
548
549 static int
550 bridge_modevent(module_t mod, int type, void *data)
551 {
552
553 switch (type) {
554 case MOD_LOAD:
555 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
556 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
557 UMA_ALIGN_PTR, 0);
558 bridge_dn_p = bridge_dummynet;
559 bridge_detach_cookie = EVENTHANDLER_REGISTER(
560 ifnet_departure_event, bridge_ifdetach, NULL,
561 EVENTHANDLER_PRI_ANY);
562 break;
563 case MOD_UNLOAD:
564 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
565 bridge_detach_cookie);
566 uma_zdestroy(bridge_rtnode_zone);
567 bridge_dn_p = NULL;
568 break;
569 default:
570 return (EOPNOTSUPP);
571 }
572 return (0);
573 }
574
575 static moduledata_t bridge_mod = {
576 "if_bridge",
577 bridge_modevent,
578 0
579 };
580
581 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
582 MODULE_VERSION(if_bridge, 1);
583 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
584
585 /*
586 * handler for net.link.bridge.ipfw
587 */
588 static int
589 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
590 {
591 int enable = V_pfil_ipfw;
592 int error;
593
594 error = sysctl_handle_int(oidp, &enable, 0, req);
595 enable &= 1;
596
597 if (enable != V_pfil_ipfw) {
598 V_pfil_ipfw = enable;
599
600 /*
601 * Disable pfil so that ipfw doesnt run twice, if the user
602 * really wants both then they can re-enable pfil_bridge and/or
603 * pfil_member. Also allow non-ip packets as ipfw can filter by
604 * layer2 type.
605 */
606 if (V_pfil_ipfw) {
607 V_pfil_onlyip = 0;
608 V_pfil_bridge = 0;
609 V_pfil_member = 0;
610 }
611 }
612
613 return (error);
614 }
615 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
616 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
617 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
618 "Layer2 filter with IPFW");
619
620 /*
621 * bridge_clone_create:
622 *
623 * Create a new bridge instance.
624 */
625 static int
626 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
627 {
628 struct bridge_softc *sc, *sc2;
629 struct ifnet *bifp, *ifp;
630 int fb, retry;
631 unsigned long hostid;
632
633 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
634 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
635 if (ifp == NULL) {
636 free(sc, M_DEVBUF);
637 return (ENOSPC);
638 }
639
640 BRIDGE_LOCK_INIT(sc);
641 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
642 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
643
644 /* Initialize our routing table. */
645 bridge_rtable_init(sc);
646
647 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
648
649 LIST_INIT(&sc->sc_iflist);
650 LIST_INIT(&sc->sc_spanlist);
651
652 ifp->if_softc = sc;
653 if_initname(ifp, bridge_name, unit);
654 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
655 ifp->if_ioctl = bridge_ioctl;
656 ifp->if_transmit = bridge_transmit;
657 ifp->if_qflush = bridge_qflush;
658 ifp->if_init = bridge_init;
659 ifp->if_type = IFT_BRIDGE;
660
661 /*
662 * Generate an ethernet address with a locally administered address.
663 *
664 * Since we are using random ethernet addresses for the bridge, it is
665 * possible that we might have address collisions, so make sure that
666 * this hardware address isn't already in use on another bridge.
667 * The first try uses the hostid and falls back to arc4rand().
668 */
669 fb = 0;
670 getcredhostid(curthread->td_ucred, &hostid);
671 do {
672 if (fb || hostid == 0) {
673 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
674 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
675 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
676 } else {
677 sc->sc_defaddr[0] = 0x2;
678 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
679 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
680 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
681 sc->sc_defaddr[4] = hostid & 0xff;
682 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
683 }
684
685 fb = 1;
686 retry = 0;
687 BRIDGE_LIST_LOCK();
688 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
689 bifp = sc2->sc_ifp;
690 if (memcmp(sc->sc_defaddr,
691 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
692 retry = 1;
693 break;
694 }
695 }
696 BRIDGE_LIST_UNLOCK();
697 } while (retry == 1);
698
699 bstp_attach(&sc->sc_stp, &bridge_ops);
700 ether_ifattach(ifp, sc->sc_defaddr);
701 /* Now undo some of the damage... */
702 ifp->if_baudrate = 0;
703 ifp->if_type = IFT_BRIDGE;
704
705 BRIDGE_LIST_LOCK();
706 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
707 BRIDGE_LIST_UNLOCK();
708
709 return (0);
710 }
711
712 /*
713 * bridge_clone_destroy:
714 *
715 * Destroy a bridge instance.
716 */
717 static void
718 bridge_clone_destroy(struct ifnet *ifp)
719 {
720 struct bridge_softc *sc = ifp->if_softc;
721 struct bridge_iflist *bif;
722
723 BRIDGE_LOCK(sc);
724
725 bridge_stop(ifp, 1);
726 ifp->if_flags &= ~IFF_UP;
727
728 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
729 bridge_delete_member(sc, bif, 0);
730
731 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
732 bridge_delete_span(sc, bif);
733 }
734
735 BRIDGE_UNLOCK(sc);
736
737 callout_drain(&sc->sc_brcallout);
738
739 BRIDGE_LIST_LOCK();
740 LIST_REMOVE(sc, sc_list);
741 BRIDGE_LIST_UNLOCK();
742
743 bstp_detach(&sc->sc_stp);
744 ether_ifdetach(ifp);
745 if_free(ifp);
746
747 /* Tear down the routing table. */
748 bridge_rtable_fini(sc);
749
750 BRIDGE_LOCK_DESTROY(sc);
751 free(sc, M_DEVBUF);
752 }
753
754 /*
755 * bridge_ioctl:
756 *
757 * Handle a control request from the operator.
758 */
759 static int
760 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
761 {
762 struct bridge_softc *sc = ifp->if_softc;
763 struct ifreq *ifr = (struct ifreq *)data;
764 struct bridge_iflist *bif;
765 struct thread *td = curthread;
766 union {
767 struct ifbreq ifbreq;
768 struct ifbifconf ifbifconf;
769 struct ifbareq ifbareq;
770 struct ifbaconf ifbaconf;
771 struct ifbrparam ifbrparam;
772 struct ifbropreq ifbropreq;
773 } args;
774 struct ifdrv *ifd = (struct ifdrv *) data;
775 const struct bridge_control *bc;
776 int error = 0;
777
778 switch (cmd) {
779
780 case SIOCADDMULTI:
781 case SIOCDELMULTI:
782 break;
783
784 case SIOCGDRVSPEC:
785 case SIOCSDRVSPEC:
786 if (ifd->ifd_cmd >= bridge_control_table_size) {
787 error = EINVAL;
788 break;
789 }
790 bc = &bridge_control_table[ifd->ifd_cmd];
791
792 if (cmd == SIOCGDRVSPEC &&
793 (bc->bc_flags & BC_F_COPYOUT) == 0) {
794 error = EINVAL;
795 break;
796 }
797 else if (cmd == SIOCSDRVSPEC &&
798 (bc->bc_flags & BC_F_COPYOUT) != 0) {
799 error = EINVAL;
800 break;
801 }
802
803 if (bc->bc_flags & BC_F_SUSER) {
804 error = priv_check(td, PRIV_NET_BRIDGE);
805 if (error)
806 break;
807 }
808
809 if (ifd->ifd_len != bc->bc_argsize ||
810 ifd->ifd_len > sizeof(args)) {
811 error = EINVAL;
812 break;
813 }
814
815 bzero(&args, sizeof(args));
816 if (bc->bc_flags & BC_F_COPYIN) {
817 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
818 if (error)
819 break;
820 }
821
822 BRIDGE_LOCK(sc);
823 error = (*bc->bc_func)(sc, &args);
824 BRIDGE_UNLOCK(sc);
825 if (error)
826 break;
827
828 if (bc->bc_flags & BC_F_COPYOUT)
829 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
830
831 break;
832
833 case SIOCSIFFLAGS:
834 if (!(ifp->if_flags & IFF_UP) &&
835 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
836 /*
837 * If interface is marked down and it is running,
838 * then stop and disable it.
839 */
840 BRIDGE_LOCK(sc);
841 bridge_stop(ifp, 1);
842 BRIDGE_UNLOCK(sc);
843 } else if ((ifp->if_flags & IFF_UP) &&
844 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
845 /*
846 * If interface is marked up and it is stopped, then
847 * start it.
848 */
849 (*ifp->if_init)(sc);
850 }
851 break;
852
853 case SIOCSIFMTU:
854 if (ifr->ifr_mtu < 576) {
855 error = EINVAL;
856 break;
857 }
858 if (LIST_EMPTY(&sc->sc_iflist)) {
859 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
860 break;
861 }
862 BRIDGE_LOCK(sc);
863 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
864 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
865 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
866 " != %d\n", sc->sc_ifp->if_xname,
867 bif->bif_ifp->if_mtu,
868 bif->bif_ifp->if_xname, ifr->ifr_mtu);
869 error = EINVAL;
870 break;
871 }
872 }
873 if (!error)
874 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
875 BRIDGE_UNLOCK(sc);
876 break;
877 default:
878 /*
879 * drop the lock as ether_ioctl() will call bridge_start() and
880 * cause the lock to be recursed.
881 */
882 error = ether_ioctl(ifp, cmd, data);
883 break;
884 }
885
886 return (error);
887 }
888
889 /*
890 * bridge_mutecaps:
891 *
892 * Clear or restore unwanted capabilities on the member interface
893 */
894 static void
895 bridge_mutecaps(struct bridge_softc *sc)
896 {
897 struct bridge_iflist *bif;
898 int enabled, mask;
899
900 /* Initial bitmask of capabilities to test */
901 mask = BRIDGE_IFCAPS_MASK;
902
903 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
904 /* Every member must support it or its disabled */
905 mask &= bif->bif_savedcaps;
906 }
907
908 BRIDGE_XLOCK(sc);
909 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
910 enabled = bif->bif_ifp->if_capenable;
911 enabled &= ~BRIDGE_IFCAPS_STRIP;
912 /* strip off mask bits and enable them again if allowed */
913 enabled &= ~BRIDGE_IFCAPS_MASK;
914 enabled |= mask;
915 BRIDGE_UNLOCK(sc);
916 bridge_set_ifcap(sc, bif, enabled);
917 BRIDGE_LOCK(sc);
918 }
919 BRIDGE_XDROP(sc);
920
921 }
922
923 static void
924 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
925 {
926 struct ifnet *ifp = bif->bif_ifp;
927 struct ifreq ifr;
928 int error;
929
930 BRIDGE_UNLOCK_ASSERT(sc);
931
932 bzero(&ifr, sizeof(ifr));
933 ifr.ifr_reqcap = set;
934
935 if (ifp->if_capenable != set) {
936 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
937 if (error)
938 if_printf(sc->sc_ifp,
939 "error setting capabilities on %s: %d\n",
940 ifp->if_xname, error);
941 if ((ifp->if_capenable & ~set) != 0)
942 if_printf(sc->sc_ifp,
943 "can't disable some capabilities on %s: 0x%x\n",
944 ifp->if_xname, ifp->if_capenable & ~set);
945 }
946 }
947
948 /*
949 * bridge_lookup_member:
950 *
951 * Lookup a bridge member interface.
952 */
953 static struct bridge_iflist *
954 bridge_lookup_member(struct bridge_softc *sc, const char *name)
955 {
956 struct bridge_iflist *bif;
957 struct ifnet *ifp;
958
959 BRIDGE_LOCK_ASSERT(sc);
960
961 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
962 ifp = bif->bif_ifp;
963 if (strcmp(ifp->if_xname, name) == 0)
964 return (bif);
965 }
966
967 return (NULL);
968 }
969
970 /*
971 * bridge_lookup_member_if:
972 *
973 * Lookup a bridge member interface by ifnet*.
974 */
975 static struct bridge_iflist *
976 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
977 {
978 struct bridge_iflist *bif;
979
980 BRIDGE_LOCK_ASSERT(sc);
981
982 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
983 if (bif->bif_ifp == member_ifp)
984 return (bif);
985 }
986
987 return (NULL);
988 }
989
990 /*
991 * bridge_delete_member:
992 *
993 * Delete the specified member interface.
994 */
995 static void
996 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
997 int gone)
998 {
999 struct ifnet *ifs = bif->bif_ifp;
1000 struct ifnet *fif = NULL;
1001
1002 BRIDGE_LOCK_ASSERT(sc);
1003
1004 if (bif->bif_flags & IFBIF_STP)
1005 bstp_disable(&bif->bif_stp);
1006
1007 ifs->if_bridge = NULL;
1008 BRIDGE_XLOCK(sc);
1009 LIST_REMOVE(bif, bif_next);
1010 BRIDGE_XDROP(sc);
1011
1012 /*
1013 * If removing the interface that gave the bridge its mac address, set
1014 * the mac address of the bridge to the address of the next member, or
1015 * to its default address if no members are left.
1016 */
1017 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1018 if (LIST_EMPTY(&sc->sc_iflist)) {
1019 bcopy(sc->sc_defaddr,
1020 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1021 sc->sc_ifaddr = NULL;
1022 } else {
1023 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1024 bcopy(IF_LLADDR(fif),
1025 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1026 sc->sc_ifaddr = fif;
1027 }
1028 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1029 }
1030
1031 bridge_linkcheck(sc);
1032 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1033 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1034 KASSERT(bif->bif_addrcnt == 0,
1035 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1036
1037 ifs->if_bridge_output = NULL;
1038 ifs->if_bridge_input = NULL;
1039 ifs->if_bridge_linkstate = NULL;
1040 BRIDGE_UNLOCK(sc);
1041 if (!gone) {
1042 switch (ifs->if_type) {
1043 case IFT_ETHER:
1044 case IFT_L2VLAN:
1045 /*
1046 * Take the interface out of promiscuous mode, but only
1047 * if it was promiscuous in the first place. It might
1048 * not be if we're in the bridge_ioctl_add() error path.
1049 */
1050 if (ifs->if_flags & IFF_PROMISC)
1051 (void) ifpromisc(ifs, 0);
1052 break;
1053
1054 case IFT_GIF:
1055 break;
1056
1057 default:
1058 #ifdef DIAGNOSTIC
1059 panic("bridge_delete_member: impossible");
1060 #endif
1061 break;
1062 }
1063 /* reneable any interface capabilities */
1064 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1065 }
1066 bstp_destroy(&bif->bif_stp); /* prepare to free */
1067 BRIDGE_LOCK(sc);
1068 free(bif, M_DEVBUF);
1069 }
1070
1071 /*
1072 * bridge_delete_span:
1073 *
1074 * Delete the specified span interface.
1075 */
1076 static void
1077 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1078 {
1079 BRIDGE_LOCK_ASSERT(sc);
1080
1081 KASSERT(bif->bif_ifp->if_bridge == NULL,
1082 ("%s: not a span interface", __func__));
1083
1084 LIST_REMOVE(bif, bif_next);
1085 free(bif, M_DEVBUF);
1086 }
1087
1088 static int
1089 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1090 {
1091 struct ifbreq *req = arg;
1092 struct bridge_iflist *bif = NULL;
1093 struct ifnet *ifs;
1094 int error = 0;
1095
1096 ifs = ifunit(req->ifbr_ifsname);
1097 if (ifs == NULL)
1098 return (ENOENT);
1099 if (ifs->if_ioctl == NULL) /* must be supported */
1100 return (EINVAL);
1101
1102 /* If it's in the span list, it can't be a member. */
1103 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1104 if (ifs == bif->bif_ifp)
1105 return (EBUSY);
1106
1107 if (ifs->if_bridge == sc)
1108 return (EEXIST);
1109
1110 if (ifs->if_bridge != NULL)
1111 return (EBUSY);
1112
1113 switch (ifs->if_type) {
1114 case IFT_ETHER:
1115 case IFT_L2VLAN:
1116 case IFT_GIF:
1117 /* permitted interface types */
1118 break;
1119 default:
1120 return (EINVAL);
1121 }
1122
1123 #ifdef INET6
1124 /*
1125 * Two valid inet6 addresses with link-local scope must not be
1126 * on the parent interface and the member interfaces at the
1127 * same time. This restriction is needed to prevent violation
1128 * of link-local scope zone. Attempts to add a member
1129 * interface which has inet6 addresses when the parent has
1130 * inet6 triggers removal of all inet6 addresses on the member
1131 * interface.
1132 */
1133
1134 /* Check if the parent interface has a link-local scope addr. */
1135 if (V_allow_llz_overlap == 0 &&
1136 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1137 /*
1138 * If any, remove all inet6 addresses from the member
1139 * interfaces.
1140 */
1141 BRIDGE_XLOCK(sc);
1142 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1143 if (in6ifa_llaonifp(bif->bif_ifp)) {
1144 BRIDGE_UNLOCK(sc);
1145 in6_ifdetach(bif->bif_ifp);
1146 BRIDGE_LOCK(sc);
1147 if_printf(sc->sc_ifp,
1148 "IPv6 addresses on %s have been removed "
1149 "before adding it as a member to prevent "
1150 "IPv6 address scope violation.\n",
1151 bif->bif_ifp->if_xname);
1152 }
1153 }
1154 BRIDGE_XDROP(sc);
1155 if (in6ifa_llaonifp(ifs)) {
1156 BRIDGE_UNLOCK(sc);
1157 in6_ifdetach(ifs);
1158 BRIDGE_LOCK(sc);
1159 if_printf(sc->sc_ifp,
1160 "IPv6 addresses on %s have been removed "
1161 "before adding it as a member to prevent "
1162 "IPv6 address scope violation.\n",
1163 ifs->if_xname);
1164 }
1165 }
1166 #endif
1167 /* Allow the first Ethernet member to define the MTU */
1168 if (LIST_EMPTY(&sc->sc_iflist))
1169 sc->sc_ifp->if_mtu = ifs->if_mtu;
1170 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1171 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1172 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1173 return (EINVAL);
1174 }
1175
1176 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1177 if (bif == NULL)
1178 return (ENOMEM);
1179
1180 bif->bif_ifp = ifs;
1181 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1182 bif->bif_savedcaps = ifs->if_capenable;
1183
1184 /*
1185 * Assign the interface's MAC address to the bridge if it's the first
1186 * member and the MAC address of the bridge has not been changed from
1187 * the default randomly generated one.
1188 */
1189 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1190 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1191 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1192 sc->sc_ifaddr = ifs;
1193 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1194 }
1195
1196 ifs->if_bridge = sc;
1197 ifs->if_bridge_output = bridge_output;
1198 ifs->if_bridge_input = bridge_input;
1199 ifs->if_bridge_linkstate = bridge_linkstate;
1200 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1201 /*
1202 * XXX: XLOCK HERE!?!
1203 *
1204 * NOTE: insert_***HEAD*** should be safe for the traversals.
1205 */
1206 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1207
1208 /* Set interface capabilities to the intersection set of all members */
1209 bridge_mutecaps(sc);
1210 bridge_linkcheck(sc);
1211
1212 /* Place the interface into promiscuous mode */
1213 switch (ifs->if_type) {
1214 case IFT_ETHER:
1215 case IFT_L2VLAN:
1216 BRIDGE_UNLOCK(sc);
1217 error = ifpromisc(ifs, 1);
1218 BRIDGE_LOCK(sc);
1219 break;
1220 }
1221
1222 if (error)
1223 bridge_delete_member(sc, bif, 0);
1224 return (error);
1225 }
1226
1227 static int
1228 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1229 {
1230 struct ifbreq *req = arg;
1231 struct bridge_iflist *bif;
1232
1233 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1234 if (bif == NULL)
1235 return (ENOENT);
1236
1237 bridge_delete_member(sc, bif, 0);
1238
1239 return (0);
1240 }
1241
1242 static int
1243 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1244 {
1245 struct ifbreq *req = arg;
1246 struct bridge_iflist *bif;
1247 struct bstp_port *bp;
1248
1249 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1250 if (bif == NULL)
1251 return (ENOENT);
1252
1253 bp = &bif->bif_stp;
1254 req->ifbr_ifsflags = bif->bif_flags;
1255 req->ifbr_state = bp->bp_state;
1256 req->ifbr_priority = bp->bp_priority;
1257 req->ifbr_path_cost = bp->bp_path_cost;
1258 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1259 req->ifbr_proto = bp->bp_protover;
1260 req->ifbr_role = bp->bp_role;
1261 req->ifbr_stpflags = bp->bp_flags;
1262 req->ifbr_addrcnt = bif->bif_addrcnt;
1263 req->ifbr_addrmax = bif->bif_addrmax;
1264 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1265
1266 /* Copy STP state options as flags */
1267 if (bp->bp_operedge)
1268 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1269 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1270 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1271 if (bp->bp_ptp_link)
1272 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1273 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1274 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1275 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1276 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1277 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1278 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1279 return (0);
1280 }
1281
1282 static int
1283 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1284 {
1285 struct ifbreq *req = arg;
1286 struct bridge_iflist *bif;
1287 struct bstp_port *bp;
1288 int error;
1289
1290 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1291 if (bif == NULL)
1292 return (ENOENT);
1293 bp = &bif->bif_stp;
1294
1295 if (req->ifbr_ifsflags & IFBIF_SPAN)
1296 /* SPAN is readonly */
1297 return (EINVAL);
1298
1299 if (req->ifbr_ifsflags & IFBIF_STP) {
1300 if ((bif->bif_flags & IFBIF_STP) == 0) {
1301 error = bstp_enable(&bif->bif_stp);
1302 if (error)
1303 return (error);
1304 }
1305 } else {
1306 if ((bif->bif_flags & IFBIF_STP) != 0)
1307 bstp_disable(&bif->bif_stp);
1308 }
1309
1310 /* Pass on STP flags */
1311 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1312 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1313 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1314 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1315
1316 /* Save the bits relating to the bridge */
1317 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1318
1319 return (0);
1320 }
1321
1322 static int
1323 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1324 {
1325 struct ifbrparam *param = arg;
1326
1327 sc->sc_brtmax = param->ifbrp_csize;
1328 bridge_rttrim(sc);
1329
1330 return (0);
1331 }
1332
1333 static int
1334 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1335 {
1336 struct ifbrparam *param = arg;
1337
1338 param->ifbrp_csize = sc->sc_brtmax;
1339
1340 return (0);
1341 }
1342
1343 static int
1344 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1345 {
1346 struct ifbifconf *bifc = arg;
1347 struct bridge_iflist *bif;
1348 struct ifbreq breq;
1349 char *buf, *outbuf;
1350 int count, buflen, len, error = 0;
1351
1352 count = 0;
1353 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1354 count++;
1355 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1356 count++;
1357
1358 buflen = sizeof(breq) * count;
1359 if (bifc->ifbic_len == 0) {
1360 bifc->ifbic_len = buflen;
1361 return (0);
1362 }
1363 BRIDGE_UNLOCK(sc);
1364 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1365 BRIDGE_LOCK(sc);
1366
1367 count = 0;
1368 buf = outbuf;
1369 len = min(bifc->ifbic_len, buflen);
1370 bzero(&breq, sizeof(breq));
1371 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1372 if (len < sizeof(breq))
1373 break;
1374
1375 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1376 sizeof(breq.ifbr_ifsname));
1377 /* Fill in the ifbreq structure */
1378 error = bridge_ioctl_gifflags(sc, &breq);
1379 if (error)
1380 break;
1381 memcpy(buf, &breq, sizeof(breq));
1382 count++;
1383 buf += sizeof(breq);
1384 len -= sizeof(breq);
1385 }
1386 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1387 if (len < sizeof(breq))
1388 break;
1389
1390 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1391 sizeof(breq.ifbr_ifsname));
1392 breq.ifbr_ifsflags = bif->bif_flags;
1393 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1394 memcpy(buf, &breq, sizeof(breq));
1395 count++;
1396 buf += sizeof(breq);
1397 len -= sizeof(breq);
1398 }
1399
1400 BRIDGE_UNLOCK(sc);
1401 bifc->ifbic_len = sizeof(breq) * count;
1402 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1403 BRIDGE_LOCK(sc);
1404 free(outbuf, M_TEMP);
1405 return (error);
1406 }
1407
1408 static int
1409 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1410 {
1411 struct ifbaconf *bac = arg;
1412 struct bridge_rtnode *brt;
1413 struct ifbareq bareq;
1414 char *buf, *outbuf;
1415 int count, buflen, len, error = 0;
1416
1417 if (bac->ifbac_len == 0)
1418 return (0);
1419
1420 count = 0;
1421 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1422 count++;
1423 buflen = sizeof(bareq) * count;
1424
1425 BRIDGE_UNLOCK(sc);
1426 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1427 BRIDGE_LOCK(sc);
1428
1429 count = 0;
1430 buf = outbuf;
1431 len = min(bac->ifbac_len, buflen);
1432 bzero(&bareq, sizeof(bareq));
1433 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1434 if (len < sizeof(bareq))
1435 goto out;
1436 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1437 sizeof(bareq.ifba_ifsname));
1438 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1439 bareq.ifba_vlan = brt->brt_vlan;
1440 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1441 time_uptime < brt->brt_expire)
1442 bareq.ifba_expire = brt->brt_expire - time_uptime;
1443 else
1444 bareq.ifba_expire = 0;
1445 bareq.ifba_flags = brt->brt_flags;
1446
1447 memcpy(buf, &bareq, sizeof(bareq));
1448 count++;
1449 buf += sizeof(bareq);
1450 len -= sizeof(bareq);
1451 }
1452 out:
1453 BRIDGE_UNLOCK(sc);
1454 bac->ifbac_len = sizeof(bareq) * count;
1455 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1456 BRIDGE_LOCK(sc);
1457 free(outbuf, M_TEMP);
1458 return (error);
1459 }
1460
1461 static int
1462 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1463 {
1464 struct ifbareq *req = arg;
1465 struct bridge_iflist *bif;
1466 int error;
1467
1468 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1469 if (bif == NULL)
1470 return (ENOENT);
1471
1472 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1473 req->ifba_flags);
1474
1475 return (error);
1476 }
1477
1478 static int
1479 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1480 {
1481 struct ifbrparam *param = arg;
1482
1483 sc->sc_brttimeout = param->ifbrp_ctime;
1484 return (0);
1485 }
1486
1487 static int
1488 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1489 {
1490 struct ifbrparam *param = arg;
1491
1492 param->ifbrp_ctime = sc->sc_brttimeout;
1493 return (0);
1494 }
1495
1496 static int
1497 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1498 {
1499 struct ifbareq *req = arg;
1500
1501 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1502 }
1503
1504 static int
1505 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1506 {
1507 struct ifbreq *req = arg;
1508
1509 bridge_rtflush(sc, req->ifbr_ifsflags);
1510 return (0);
1511 }
1512
1513 static int
1514 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1515 {
1516 struct ifbrparam *param = arg;
1517 struct bstp_state *bs = &sc->sc_stp;
1518
1519 param->ifbrp_prio = bs->bs_bridge_priority;
1520 return (0);
1521 }
1522
1523 static int
1524 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1525 {
1526 struct ifbrparam *param = arg;
1527
1528 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1529 }
1530
1531 static int
1532 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1533 {
1534 struct ifbrparam *param = arg;
1535 struct bstp_state *bs = &sc->sc_stp;
1536
1537 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1538 return (0);
1539 }
1540
1541 static int
1542 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1543 {
1544 struct ifbrparam *param = arg;
1545
1546 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1547 }
1548
1549 static int
1550 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1551 {
1552 struct ifbrparam *param = arg;
1553 struct bstp_state *bs = &sc->sc_stp;
1554
1555 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1556 return (0);
1557 }
1558
1559 static int
1560 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1561 {
1562 struct ifbrparam *param = arg;
1563
1564 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1565 }
1566
1567 static int
1568 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1569 {
1570 struct ifbrparam *param = arg;
1571 struct bstp_state *bs = &sc->sc_stp;
1572
1573 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1574 return (0);
1575 }
1576
1577 static int
1578 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1579 {
1580 struct ifbrparam *param = arg;
1581
1582 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1583 }
1584
1585 static int
1586 bridge_ioctl_sifprio(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_port_priority(&bif->bif_stp, req->ifbr_priority));
1596 }
1597
1598 static int
1599 bridge_ioctl_sifcost(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 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1609 }
1610
1611 static int
1612 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1613 {
1614 struct ifbreq *req = arg;
1615 struct bridge_iflist *bif;
1616
1617 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1618 if (bif == NULL)
1619 return (ENOENT);
1620
1621 bif->bif_addrmax = req->ifbr_addrmax;
1622 return (0);
1623 }
1624
1625 static int
1626 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1627 {
1628 struct ifbreq *req = arg;
1629 struct bridge_iflist *bif = NULL;
1630 struct ifnet *ifs;
1631
1632 ifs = ifunit(req->ifbr_ifsname);
1633 if (ifs == NULL)
1634 return (ENOENT);
1635
1636 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1637 if (ifs == bif->bif_ifp)
1638 return (EBUSY);
1639
1640 if (ifs->if_bridge != NULL)
1641 return (EBUSY);
1642
1643 switch (ifs->if_type) {
1644 case IFT_ETHER:
1645 case IFT_GIF:
1646 case IFT_L2VLAN:
1647 break;
1648 default:
1649 return (EINVAL);
1650 }
1651
1652 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1653 if (bif == NULL)
1654 return (ENOMEM);
1655
1656 bif->bif_ifp = ifs;
1657 bif->bif_flags = IFBIF_SPAN;
1658
1659 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1660
1661 return (0);
1662 }
1663
1664 static int
1665 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1666 {
1667 struct ifbreq *req = arg;
1668 struct bridge_iflist *bif;
1669 struct ifnet *ifs;
1670
1671 ifs = ifunit(req->ifbr_ifsname);
1672 if (ifs == NULL)
1673 return (ENOENT);
1674
1675 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1676 if (ifs == bif->bif_ifp)
1677 break;
1678
1679 if (bif == NULL)
1680 return (ENOENT);
1681
1682 bridge_delete_span(sc, bif);
1683
1684 return (0);
1685 }
1686
1687 static int
1688 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1689 {
1690 struct ifbropreq *req = arg;
1691 struct bstp_state *bs = &sc->sc_stp;
1692 struct bstp_port *root_port;
1693
1694 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1695 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1696 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1697
1698 root_port = bs->bs_root_port;
1699 if (root_port == NULL)
1700 req->ifbop_root_port = 0;
1701 else
1702 req->ifbop_root_port = root_port->bp_ifp->if_index;
1703
1704 req->ifbop_holdcount = bs->bs_txholdcount;
1705 req->ifbop_priority = bs->bs_bridge_priority;
1706 req->ifbop_protocol = bs->bs_protover;
1707 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1708 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1709 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1710 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1711 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1712 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1713
1714 return (0);
1715 }
1716
1717 static int
1718 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1719 {
1720 struct ifbrparam *param = arg;
1721
1722 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1723 return (0);
1724 }
1725
1726 static int
1727 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1728 {
1729 struct ifbpstpconf *bifstp = arg;
1730 struct bridge_iflist *bif;
1731 struct bstp_port *bp;
1732 struct ifbpstpreq bpreq;
1733 char *buf, *outbuf;
1734 int count, buflen, len, error = 0;
1735
1736 count = 0;
1737 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1738 if ((bif->bif_flags & IFBIF_STP) != 0)
1739 count++;
1740 }
1741
1742 buflen = sizeof(bpreq) * count;
1743 if (bifstp->ifbpstp_len == 0) {
1744 bifstp->ifbpstp_len = buflen;
1745 return (0);
1746 }
1747
1748 BRIDGE_UNLOCK(sc);
1749 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1750 BRIDGE_LOCK(sc);
1751
1752 count = 0;
1753 buf = outbuf;
1754 len = min(bifstp->ifbpstp_len, buflen);
1755 bzero(&bpreq, sizeof(bpreq));
1756 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1757 if (len < sizeof(bpreq))
1758 break;
1759
1760 if ((bif->bif_flags & IFBIF_STP) == 0)
1761 continue;
1762
1763 bp = &bif->bif_stp;
1764 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1765 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1766 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1767 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1768 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1769 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1770
1771 memcpy(buf, &bpreq, sizeof(bpreq));
1772 count++;
1773 buf += sizeof(bpreq);
1774 len -= sizeof(bpreq);
1775 }
1776
1777 BRIDGE_UNLOCK(sc);
1778 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1779 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1780 BRIDGE_LOCK(sc);
1781 free(outbuf, M_TEMP);
1782 return (error);
1783 }
1784
1785 static int
1786 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1787 {
1788 struct ifbrparam *param = arg;
1789
1790 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1791 }
1792
1793 static int
1794 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1795 {
1796 struct ifbrparam *param = arg;
1797
1798 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1799 }
1800
1801 /*
1802 * bridge_ifdetach:
1803 *
1804 * Detach an interface from a bridge. Called when a member
1805 * interface is detaching.
1806 */
1807 static void
1808 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1809 {
1810 struct bridge_softc *sc = ifp->if_bridge;
1811 struct bridge_iflist *bif;
1812
1813 if (ifp->if_flags & IFF_RENAMING)
1814 return;
1815 if (V_bridge_cloner == NULL) {
1816 /*
1817 * This detach handler can be called after
1818 * vnet_bridge_uninit(). Just return in that case.
1819 */
1820 return;
1821 }
1822 /* Check if the interface is a bridge member */
1823 if (sc != NULL) {
1824 BRIDGE_LOCK(sc);
1825
1826 bif = bridge_lookup_member_if(sc, ifp);
1827 if (bif != NULL)
1828 bridge_delete_member(sc, bif, 1);
1829
1830 BRIDGE_UNLOCK(sc);
1831 return;
1832 }
1833
1834 /* Check if the interface is a span port */
1835 BRIDGE_LIST_LOCK();
1836 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1837 BRIDGE_LOCK(sc);
1838 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1839 if (ifp == bif->bif_ifp) {
1840 bridge_delete_span(sc, bif);
1841 break;
1842 }
1843
1844 BRIDGE_UNLOCK(sc);
1845 }
1846 BRIDGE_LIST_UNLOCK();
1847 }
1848
1849 /*
1850 * bridge_init:
1851 *
1852 * Initialize a bridge interface.
1853 */
1854 static void
1855 bridge_init(void *xsc)
1856 {
1857 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1858 struct ifnet *ifp = sc->sc_ifp;
1859
1860 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1861 return;
1862
1863 BRIDGE_LOCK(sc);
1864 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1865 bridge_timer, sc);
1866
1867 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1868 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1869
1870 BRIDGE_UNLOCK(sc);
1871 }
1872
1873 /*
1874 * bridge_stop:
1875 *
1876 * Stop the bridge interface.
1877 */
1878 static void
1879 bridge_stop(struct ifnet *ifp, int disable)
1880 {
1881 struct bridge_softc *sc = ifp->if_softc;
1882
1883 BRIDGE_LOCK_ASSERT(sc);
1884
1885 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1886 return;
1887
1888 callout_stop(&sc->sc_brcallout);
1889 bstp_stop(&sc->sc_stp);
1890
1891 bridge_rtflush(sc, IFBF_FLUSHDYN);
1892
1893 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1894 }
1895
1896 /*
1897 * bridge_enqueue:
1898 *
1899 * Enqueue a packet on a bridge member interface.
1900 *
1901 */
1902 static int
1903 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1904 {
1905 int len, err = 0;
1906 short mflags;
1907 struct mbuf *m0;
1908
1909 /* We may be sending a fragment so traverse the mbuf */
1910 for (; m; m = m0) {
1911 m0 = m->m_nextpkt;
1912 m->m_nextpkt = NULL;
1913 len = m->m_pkthdr.len;
1914 mflags = m->m_flags;
1915
1916 /*
1917 * If underlying interface can not do VLAN tag insertion itself
1918 * then attach a packet tag that holds it.
1919 */
1920 if ((m->m_flags & M_VLANTAG) &&
1921 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1922 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1923 if (m == NULL) {
1924 if_printf(dst_ifp,
1925 "unable to prepend VLAN header\n");
1926 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1927 continue;
1928 }
1929 m->m_flags &= ~M_VLANTAG;
1930 }
1931
1932 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1933 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1934 m_freem(m0);
1935 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1936 break;
1937 }
1938
1939 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1940 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1941 if (mflags & M_MCAST)
1942 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1943 }
1944
1945 return (err);
1946 }
1947
1948 /*
1949 * bridge_dummynet:
1950 *
1951 * Receive a queued packet from dummynet and pass it on to the output
1952 * interface.
1953 *
1954 * The mbuf has the Ethernet header already attached.
1955 */
1956 static void
1957 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1958 {
1959 struct bridge_softc *sc;
1960
1961 sc = ifp->if_bridge;
1962
1963 /*
1964 * The packet didnt originate from a member interface. This should only
1965 * ever happen if a member interface is removed while packets are
1966 * queued for it.
1967 */
1968 if (sc == NULL) {
1969 m_freem(m);
1970 return;
1971 }
1972
1973 if (PFIL_HOOKED(&V_inet_pfil_hook)
1974 #ifdef INET6
1975 || PFIL_HOOKED(&V_inet6_pfil_hook)
1976 #endif
1977 ) {
1978 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1979 return;
1980 if (m == NULL)
1981 return;
1982 }
1983
1984 bridge_enqueue(sc, ifp, m);
1985 }
1986
1987 /*
1988 * bridge_output:
1989 *
1990 * Send output from a bridge member interface. This
1991 * performs the bridging function for locally originated
1992 * packets.
1993 *
1994 * The mbuf has the Ethernet header already attached. We must
1995 * enqueue or free the mbuf before returning.
1996 */
1997 static int
1998 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1999 struct rtentry *rt)
2000 {
2001 struct ether_header *eh;
2002 struct ifnet *dst_if;
2003 struct bridge_softc *sc;
2004 uint16_t vlan;
2005
2006 if (m->m_len < ETHER_HDR_LEN) {
2007 m = m_pullup(m, ETHER_HDR_LEN);
2008 if (m == NULL)
2009 return (0);
2010 }
2011
2012 eh = mtod(m, struct ether_header *);
2013 sc = ifp->if_bridge;
2014 vlan = VLANTAGOF(m);
2015
2016 BRIDGE_LOCK(sc);
2017
2018 /*
2019 * If bridge is down, but the original output interface is up,
2020 * go ahead and send out that interface. Otherwise, the packet
2021 * is dropped below.
2022 */
2023 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2024 dst_if = ifp;
2025 goto sendunicast;
2026 }
2027
2028 /*
2029 * If the packet is a multicast, or we don't know a better way to
2030 * get there, send to all interfaces.
2031 */
2032 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2033 dst_if = NULL;
2034 else
2035 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2036 if (dst_if == NULL) {
2037 struct bridge_iflist *bif;
2038 struct mbuf *mc;
2039 int error = 0, used = 0;
2040
2041 bridge_span(sc, m);
2042
2043 BRIDGE_LOCK2REF(sc, error);
2044 if (error) {
2045 m_freem(m);
2046 return (0);
2047 }
2048
2049 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2050 dst_if = bif->bif_ifp;
2051
2052 if (dst_if->if_type == IFT_GIF)
2053 continue;
2054 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2055 continue;
2056
2057 /*
2058 * If this is not the original output interface,
2059 * and the interface is participating in spanning
2060 * tree, make sure the port is in a state that
2061 * allows forwarding.
2062 */
2063 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2064 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2065 continue;
2066
2067 if (LIST_NEXT(bif, bif_next) == NULL) {
2068 used = 1;
2069 mc = m;
2070 } else {
2071 mc = m_copypacket(m, M_NOWAIT);
2072 if (mc == NULL) {
2073 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2074 continue;
2075 }
2076 }
2077
2078 bridge_enqueue(sc, dst_if, mc);
2079 }
2080 if (used == 0)
2081 m_freem(m);
2082 BRIDGE_UNREF(sc);
2083 return (0);
2084 }
2085
2086 sendunicast:
2087 /*
2088 * XXX Spanning tree consideration here?
2089 */
2090
2091 bridge_span(sc, m);
2092 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2093 m_freem(m);
2094 BRIDGE_UNLOCK(sc);
2095 return (0);
2096 }
2097
2098 BRIDGE_UNLOCK(sc);
2099 bridge_enqueue(sc, dst_if, m);
2100 return (0);
2101 }
2102
2103 /*
2104 * bridge_transmit:
2105 *
2106 * Do output on a bridge.
2107 *
2108 */
2109 static int
2110 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2111 {
2112 struct bridge_softc *sc;
2113 struct ether_header *eh;
2114 struct ifnet *dst_if;
2115 int error = 0;
2116
2117 sc = ifp->if_softc;
2118
2119 ETHER_BPF_MTAP(ifp, m);
2120
2121 eh = mtod(m, struct ether_header *);
2122
2123 BRIDGE_LOCK(sc);
2124 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2125 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2126 BRIDGE_UNLOCK(sc);
2127 error = bridge_enqueue(sc, dst_if, m);
2128 } else
2129 bridge_broadcast(sc, ifp, m, 0);
2130
2131 return (error);
2132 }
2133
2134 /*
2135 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2136 */
2137 static void
2138 bridge_qflush(struct ifnet *ifp __unused)
2139 {
2140 }
2141
2142 /*
2143 * bridge_forward:
2144 *
2145 * The forwarding function of the bridge.
2146 *
2147 * NOTE: Releases the lock on return.
2148 */
2149 static void
2150 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2151 struct mbuf *m)
2152 {
2153 struct bridge_iflist *dbif;
2154 struct ifnet *src_if, *dst_if, *ifp;
2155 struct ether_header *eh;
2156 uint16_t vlan;
2157 uint8_t *dst;
2158 int error;
2159
2160 src_if = m->m_pkthdr.rcvif;
2161 ifp = sc->sc_ifp;
2162
2163 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2164 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2165 vlan = VLANTAGOF(m);
2166
2167 if ((sbif->bif_flags & IFBIF_STP) &&
2168 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2169 goto drop;
2170
2171 eh = mtod(m, struct ether_header *);
2172 dst = eh->ether_dhost;
2173
2174 /* If the interface is learning, record the address. */
2175 if (sbif->bif_flags & IFBIF_LEARNING) {
2176 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2177 sbif, 0, IFBAF_DYNAMIC);
2178 /*
2179 * If the interface has addresses limits then deny any source
2180 * that is not in the cache.
2181 */
2182 if (error && sbif->bif_addrmax)
2183 goto drop;
2184 }
2185
2186 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2187 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2188 goto drop;
2189
2190 /*
2191 * At this point, the port either doesn't participate
2192 * in spanning tree or it is in the forwarding state.
2193 */
2194
2195 /*
2196 * If the packet is unicast, destined for someone on
2197 * "this" side of the bridge, drop it.
2198 */
2199 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2200 dst_if = bridge_rtlookup(sc, dst, vlan);
2201 if (src_if == dst_if)
2202 goto drop;
2203 } else {
2204 /*
2205 * Check if its a reserved multicast address, any address
2206 * listed in 802.1D section 7.12.6 may not be forwarded by the
2207 * bridge.
2208 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2209 */
2210 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2211 dst[2] == 0xc2 && dst[3] == 0x00 &&
2212 dst[4] == 0x00 && dst[5] <= 0x0f)
2213 goto drop;
2214
2215 /* ...forward it to all interfaces. */
2216 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2217 dst_if = NULL;
2218 }
2219
2220 /*
2221 * If we have a destination interface which is a member of our bridge,
2222 * OR this is a unicast packet, push it through the bpf(4) machinery.
2223 * For broadcast or multicast packets, don't bother because it will
2224 * be reinjected into ether_input. We do this before we pass the packets
2225 * through the pfil(9) framework, as it is possible that pfil(9) will
2226 * drop the packet, or possibly modify it, making it difficult to debug
2227 * firewall issues on the bridge.
2228 */
2229 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2230 ETHER_BPF_MTAP(ifp, m);
2231
2232 /* run the packet filter */
2233 if (PFIL_HOOKED(&V_inet_pfil_hook)
2234 #ifdef INET6
2235 || PFIL_HOOKED(&V_inet6_pfil_hook)
2236 #endif
2237 ) {
2238 BRIDGE_UNLOCK(sc);
2239 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2240 return;
2241 if (m == NULL)
2242 return;
2243 BRIDGE_LOCK(sc);
2244 }
2245
2246 if (dst_if == NULL) {
2247 bridge_broadcast(sc, src_if, m, 1);
2248 return;
2249 }
2250
2251 /*
2252 * At this point, we're dealing with a unicast frame
2253 * going to a different interface.
2254 */
2255 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2256 goto drop;
2257
2258 dbif = bridge_lookup_member_if(sc, dst_if);
2259 if (dbif == NULL)
2260 /* Not a member of the bridge (anymore?) */
2261 goto drop;
2262
2263 /* Private segments can not talk to each other */
2264 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2265 goto drop;
2266
2267 if ((dbif->bif_flags & IFBIF_STP) &&
2268 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2269 goto drop;
2270
2271 BRIDGE_UNLOCK(sc);
2272
2273 if (PFIL_HOOKED(&V_inet_pfil_hook)
2274 #ifdef INET6
2275 || PFIL_HOOKED(&V_inet6_pfil_hook)
2276 #endif
2277 ) {
2278 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2279 return;
2280 if (m == NULL)
2281 return;
2282 }
2283
2284 bridge_enqueue(sc, dst_if, m);
2285 return;
2286
2287 drop:
2288 BRIDGE_UNLOCK(sc);
2289 m_freem(m);
2290 }
2291
2292 /*
2293 * bridge_input:
2294 *
2295 * Receive input from a member interface. Queue the packet for
2296 * bridging if it is not for us.
2297 */
2298 static struct mbuf *
2299 bridge_input(struct ifnet *ifp, struct mbuf *m)
2300 {
2301 struct bridge_softc *sc = ifp->if_bridge;
2302 struct bridge_iflist *bif, *bif2;
2303 struct ifnet *bifp;
2304 struct ether_header *eh;
2305 struct mbuf *mc, *mc2;
2306 uint16_t vlan;
2307 int error;
2308
2309 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2310 return (m);
2311
2312 bifp = sc->sc_ifp;
2313 vlan = VLANTAGOF(m);
2314
2315 /*
2316 * Implement support for bridge monitoring. If this flag has been
2317 * set on this interface, discard the packet once we push it through
2318 * the bpf(4) machinery, but before we do, increment the byte and
2319 * packet counters associated with this interface.
2320 */
2321 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2322 m->m_pkthdr.rcvif = bifp;
2323 ETHER_BPF_MTAP(bifp, m);
2324 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2325 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2326 m_freem(m);
2327 return (NULL);
2328 }
2329 BRIDGE_LOCK(sc);
2330 bif = bridge_lookup_member_if(sc, ifp);
2331 if (bif == NULL) {
2332 BRIDGE_UNLOCK(sc);
2333 return (m);
2334 }
2335
2336 eh = mtod(m, struct ether_header *);
2337
2338 bridge_span(sc, m);
2339
2340 if (m->m_flags & (M_BCAST|M_MCAST)) {
2341 /* Tap off 802.1D packets; they do not get forwarded. */
2342 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2343 ETHER_ADDR_LEN) == 0) {
2344 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2345 BRIDGE_UNLOCK(sc);
2346 return (NULL);
2347 }
2348
2349 if ((bif->bif_flags & IFBIF_STP) &&
2350 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2351 BRIDGE_UNLOCK(sc);
2352 return (m);
2353 }
2354
2355 /*
2356 * Make a deep copy of the packet and enqueue the copy
2357 * for bridge processing; return the original packet for
2358 * local processing.
2359 */
2360 mc = m_dup(m, M_NOWAIT);
2361 if (mc == NULL) {
2362 BRIDGE_UNLOCK(sc);
2363 return (m);
2364 }
2365
2366 /* Perform the bridge forwarding function with the copy. */
2367 bridge_forward(sc, bif, mc);
2368
2369 /*
2370 * Reinject the mbuf as arriving on the bridge so we have a
2371 * chance at claiming multicast packets. We can not loop back
2372 * here from ether_input as a bridge is never a member of a
2373 * bridge.
2374 */
2375 KASSERT(bifp->if_bridge == NULL,
2376 ("loop created in bridge_input"));
2377 mc2 = m_dup(m, M_NOWAIT);
2378 if (mc2 != NULL) {
2379 /* Keep the layer3 header aligned */
2380 int i = min(mc2->m_pkthdr.len, max_protohdr);
2381 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2382 }
2383 if (mc2 != NULL) {
2384 mc2->m_pkthdr.rcvif = bifp;
2385 (*bifp->if_input)(bifp, mc2);
2386 }
2387
2388 /* Return the original packet for local processing. */
2389 return (m);
2390 }
2391
2392 if ((bif->bif_flags & IFBIF_STP) &&
2393 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2394 BRIDGE_UNLOCK(sc);
2395 return (m);
2396 }
2397
2398 #if (defined(INET) || defined(INET6))
2399 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2400 || ((iface)->if_carp \
2401 && (*carp_forus_p)((iface), eh->ether_dhost))
2402 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2403 || ((iface)->if_carp \
2404 && (*carp_forus_p)((iface), eh->ether_shost))
2405 #else
2406 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2407 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2408 #endif
2409
2410 #ifdef INET6
2411 # define OR_PFIL_HOOKED_INET6 \
2412 || PFIL_HOOKED(&V_inet6_pfil_hook)
2413 #else
2414 # define OR_PFIL_HOOKED_INET6
2415 #endif
2416
2417 #define GRAB_OUR_PACKETS(iface) \
2418 if ((iface)->if_type == IFT_GIF) \
2419 continue; \
2420 /* It is destined for us. */ \
2421 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2422 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2423 ) { \
2424 if ((iface)->if_type == IFT_BRIDGE) { \
2425 ETHER_BPF_MTAP(iface, m); \
2426 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \
2427 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2428 /* Filter on the physical interface. */ \
2429 if (V_pfil_local_phys && \
2430 (PFIL_HOOKED(&V_inet_pfil_hook) \
2431 OR_PFIL_HOOKED_INET6)) { \
2432 if (bridge_pfil(&m, NULL, ifp, \
2433 PFIL_IN) != 0 || m == NULL) { \
2434 BRIDGE_UNLOCK(sc); \
2435 return (NULL); \
2436 } \
2437 eh = mtod(m, struct ether_header *); \
2438 } \
2439 } \
2440 if (bif->bif_flags & IFBIF_LEARNING) { \
2441 error = bridge_rtupdate(sc, eh->ether_shost, \
2442 vlan, bif, 0, IFBAF_DYNAMIC); \
2443 if (error && bif->bif_addrmax) { \
2444 BRIDGE_UNLOCK(sc); \
2445 m_freem(m); \
2446 return (NULL); \
2447 } \
2448 } \
2449 m->m_pkthdr.rcvif = iface; \
2450 BRIDGE_UNLOCK(sc); \
2451 return (m); \
2452 } \
2453 \
2454 /* We just received a packet that we sent out. */ \
2455 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2456 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2457 ) { \
2458 BRIDGE_UNLOCK(sc); \
2459 m_freem(m); \
2460 return (NULL); \
2461 }
2462
2463 /*
2464 * Unicast. Make sure it's not for the bridge.
2465 */
2466 do { GRAB_OUR_PACKETS(bifp) } while (0);
2467
2468 /*
2469 * Give a chance for ifp at first priority. This will help when the
2470 * packet comes through the interface like VLAN's with the same MACs
2471 * on several interfaces from the same bridge. This also will save
2472 * some CPU cycles in case the destination interface and the input
2473 * interface (eq ifp) are the same.
2474 */
2475 do { GRAB_OUR_PACKETS(ifp) } while (0);
2476
2477 /* Now check the all bridge members. */
2478 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2479 GRAB_OUR_PACKETS(bif2->bif_ifp)
2480 }
2481
2482 #undef OR_CARP_CHECK_WE_ARE_DST
2483 #undef OR_CARP_CHECK_WE_ARE_SRC
2484 #undef OR_PFIL_HOOKED_INET6
2485 #undef GRAB_OUR_PACKETS
2486
2487 /* Perform the bridge forwarding function. */
2488 bridge_forward(sc, bif, m);
2489
2490 return (NULL);
2491 }
2492
2493 /*
2494 * bridge_broadcast:
2495 *
2496 * Send a frame to all interfaces that are members of
2497 * the bridge, except for the one on which the packet
2498 * arrived.
2499 *
2500 * NOTE: Releases the lock on return.
2501 */
2502 static void
2503 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2504 struct mbuf *m, int runfilt)
2505 {
2506 struct bridge_iflist *dbif, *sbif;
2507 struct mbuf *mc;
2508 struct ifnet *dst_if;
2509 int error = 0, used = 0, i;
2510
2511 sbif = bridge_lookup_member_if(sc, src_if);
2512
2513 BRIDGE_LOCK2REF(sc, error);
2514 if (error) {
2515 m_freem(m);
2516 return;
2517 }
2518
2519 /* Filter on the bridge interface before broadcasting */
2520 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2521 #ifdef INET6
2522 || PFIL_HOOKED(&V_inet6_pfil_hook)
2523 #endif
2524 )) {
2525 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2526 goto out;
2527 if (m == NULL)
2528 goto out;
2529 }
2530
2531 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2532 dst_if = dbif->bif_ifp;
2533 if (dst_if == src_if)
2534 continue;
2535
2536 /* Private segments can not talk to each other */
2537 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2538 continue;
2539
2540 if ((dbif->bif_flags & IFBIF_STP) &&
2541 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2542 continue;
2543
2544 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2545 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2546 continue;
2547
2548 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2549 continue;
2550
2551 if (LIST_NEXT(dbif, bif_next) == NULL) {
2552 mc = m;
2553 used = 1;
2554 } else {
2555 mc = m_dup(m, M_NOWAIT);
2556 if (mc == NULL) {
2557 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2558 continue;
2559 }
2560 }
2561
2562 /*
2563 * Filter on the output interface. Pass a NULL bridge interface
2564 * pointer so we do not redundantly filter on the bridge for
2565 * each interface we broadcast on.
2566 */
2567 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2568 #ifdef INET6
2569 || PFIL_HOOKED(&V_inet6_pfil_hook)
2570 #endif
2571 )) {
2572 if (used == 0) {
2573 /* Keep the layer3 header aligned */
2574 i = min(mc->m_pkthdr.len, max_protohdr);
2575 mc = m_copyup(mc, i, ETHER_ALIGN);
2576 if (mc == NULL) {
2577 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2578 continue;
2579 }
2580 }
2581 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2582 continue;
2583 if (mc == NULL)
2584 continue;
2585 }
2586
2587 bridge_enqueue(sc, dst_if, mc);
2588 }
2589 if (used == 0)
2590 m_freem(m);
2591
2592 out:
2593 BRIDGE_UNREF(sc);
2594 }
2595
2596 /*
2597 * bridge_span:
2598 *
2599 * Duplicate a packet out one or more interfaces that are in span mode,
2600 * the original mbuf is unmodified.
2601 */
2602 static void
2603 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2604 {
2605 struct bridge_iflist *bif;
2606 struct ifnet *dst_if;
2607 struct mbuf *mc;
2608
2609 if (LIST_EMPTY(&sc->sc_spanlist))
2610 return;
2611
2612 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2613 dst_if = bif->bif_ifp;
2614
2615 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2616 continue;
2617
2618 mc = m_copypacket(m, M_NOWAIT);
2619 if (mc == NULL) {
2620 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2621 continue;
2622 }
2623
2624 bridge_enqueue(sc, dst_if, mc);
2625 }
2626 }
2627
2628 /*
2629 * bridge_rtupdate:
2630 *
2631 * Add a bridge routing entry.
2632 */
2633 static int
2634 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2635 struct bridge_iflist *bif, int setflags, uint8_t flags)
2636 {
2637 struct bridge_rtnode *brt;
2638 int error;
2639
2640 BRIDGE_LOCK_ASSERT(sc);
2641
2642 /* Check the source address is valid and not multicast. */
2643 if (ETHER_IS_MULTICAST(dst) ||
2644 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2645 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2646 return (EINVAL);
2647
2648 /* 802.1p frames map to vlan 1 */
2649 if (vlan == 0)
2650 vlan = 1;
2651
2652 /*
2653 * A route for this destination might already exist. If so,
2654 * update it, otherwise create a new one.
2655 */
2656 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2657 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2658 sc->sc_brtexceeded++;
2659 return (ENOSPC);
2660 }
2661 /* Check per interface address limits (if enabled) */
2662 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2663 bif->bif_addrexceeded++;
2664 return (ENOSPC);
2665 }
2666
2667 /*
2668 * Allocate a new bridge forwarding node, and
2669 * initialize the expiration time and Ethernet
2670 * address.
2671 */
2672 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2673 if (brt == NULL)
2674 return (ENOMEM);
2675
2676 if (bif->bif_flags & IFBIF_STICKY)
2677 brt->brt_flags = IFBAF_STICKY;
2678 else
2679 brt->brt_flags = IFBAF_DYNAMIC;
2680
2681 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2682 brt->brt_vlan = vlan;
2683
2684 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2685 uma_zfree(bridge_rtnode_zone, brt);
2686 return (error);
2687 }
2688 brt->brt_dst = bif;
2689 bif->bif_addrcnt++;
2690 }
2691
2692 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2693 brt->brt_dst != bif) {
2694 brt->brt_dst->bif_addrcnt--;
2695 brt->brt_dst = bif;
2696 brt->brt_dst->bif_addrcnt++;
2697 }
2698
2699 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2700 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2701 if (setflags)
2702 brt->brt_flags = flags;
2703
2704 return (0);
2705 }
2706
2707 /*
2708 * bridge_rtlookup:
2709 *
2710 * Lookup the destination interface for an address.
2711 */
2712 static struct ifnet *
2713 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2714 {
2715 struct bridge_rtnode *brt;
2716
2717 BRIDGE_LOCK_ASSERT(sc);
2718
2719 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2720 return (NULL);
2721
2722 return (brt->brt_ifp);
2723 }
2724
2725 /*
2726 * bridge_rttrim:
2727 *
2728 * Trim the routine table so that we have a number
2729 * of routing entries less than or equal to the
2730 * maximum number.
2731 */
2732 static void
2733 bridge_rttrim(struct bridge_softc *sc)
2734 {
2735 struct bridge_rtnode *brt, *nbrt;
2736
2737 BRIDGE_LOCK_ASSERT(sc);
2738
2739 /* Make sure we actually need to do this. */
2740 if (sc->sc_brtcnt <= sc->sc_brtmax)
2741 return;
2742
2743 /* Force an aging cycle; this might trim enough addresses. */
2744 bridge_rtage(sc);
2745 if (sc->sc_brtcnt <= sc->sc_brtmax)
2746 return;
2747
2748 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2749 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2750 bridge_rtnode_destroy(sc, brt);
2751 if (sc->sc_brtcnt <= sc->sc_brtmax)
2752 return;
2753 }
2754 }
2755 }
2756
2757 /*
2758 * bridge_timer:
2759 *
2760 * Aging timer for the bridge.
2761 */
2762 static void
2763 bridge_timer(void *arg)
2764 {
2765 struct bridge_softc *sc = arg;
2766
2767 BRIDGE_LOCK_ASSERT(sc);
2768
2769 bridge_rtage(sc);
2770
2771 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2772 callout_reset(&sc->sc_brcallout,
2773 bridge_rtable_prune_period * hz, bridge_timer, sc);
2774 }
2775
2776 /*
2777 * bridge_rtage:
2778 *
2779 * Perform an aging cycle.
2780 */
2781 static void
2782 bridge_rtage(struct bridge_softc *sc)
2783 {
2784 struct bridge_rtnode *brt, *nbrt;
2785
2786 BRIDGE_LOCK_ASSERT(sc);
2787
2788 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2789 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2790 if (time_uptime >= brt->brt_expire)
2791 bridge_rtnode_destroy(sc, brt);
2792 }
2793 }
2794 }
2795
2796 /*
2797 * bridge_rtflush:
2798 *
2799 * Remove all dynamic addresses from the bridge.
2800 */
2801 static void
2802 bridge_rtflush(struct bridge_softc *sc, int full)
2803 {
2804 struct bridge_rtnode *brt, *nbrt;
2805
2806 BRIDGE_LOCK_ASSERT(sc);
2807
2808 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2809 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2810 bridge_rtnode_destroy(sc, brt);
2811 }
2812 }
2813
2814 /*
2815 * bridge_rtdaddr:
2816 *
2817 * Remove an address from the table.
2818 */
2819 static int
2820 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2821 {
2822 struct bridge_rtnode *brt;
2823 int found = 0;
2824
2825 BRIDGE_LOCK_ASSERT(sc);
2826
2827 /*
2828 * If vlan is zero then we want to delete for all vlans so the lookup
2829 * may return more than one.
2830 */
2831 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2832 bridge_rtnode_destroy(sc, brt);
2833 found = 1;
2834 }
2835
2836 return (found ? 0 : ENOENT);
2837 }
2838
2839 /*
2840 * bridge_rtdelete:
2841 *
2842 * Delete routes to a speicifc member interface.
2843 */
2844 static void
2845 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2846 {
2847 struct bridge_rtnode *brt, *nbrt;
2848
2849 BRIDGE_LOCK_ASSERT(sc);
2850
2851 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2852 if (brt->brt_ifp == ifp && (full ||
2853 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2854 bridge_rtnode_destroy(sc, brt);
2855 }
2856 }
2857
2858 /*
2859 * bridge_rtable_init:
2860 *
2861 * Initialize the route table for this bridge.
2862 */
2863 static void
2864 bridge_rtable_init(struct bridge_softc *sc)
2865 {
2866 int i;
2867
2868 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2869 M_DEVBUF, M_WAITOK);
2870
2871 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2872 LIST_INIT(&sc->sc_rthash[i]);
2873
2874 sc->sc_rthash_key = arc4random();
2875 LIST_INIT(&sc->sc_rtlist);
2876 }
2877
2878 /*
2879 * bridge_rtable_fini:
2880 *
2881 * Deconstruct the route table for this bridge.
2882 */
2883 static void
2884 bridge_rtable_fini(struct bridge_softc *sc)
2885 {
2886
2887 KASSERT(sc->sc_brtcnt == 0,
2888 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2889 free(sc->sc_rthash, M_DEVBUF);
2890 }
2891
2892 /*
2893 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2894 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2895 */
2896 #define mix(a, b, c) \
2897 do { \
2898 a -= b; a -= c; a ^= (c >> 13); \
2899 b -= c; b -= a; b ^= (a << 8); \
2900 c -= a; c -= b; c ^= (b >> 13); \
2901 a -= b; a -= c; a ^= (c >> 12); \
2902 b -= c; b -= a; b ^= (a << 16); \
2903 c -= a; c -= b; c ^= (b >> 5); \
2904 a -= b; a -= c; a ^= (c >> 3); \
2905 b -= c; b -= a; b ^= (a << 10); \
2906 c -= a; c -= b; c ^= (b >> 15); \
2907 } while (/*CONSTCOND*/0)
2908
2909 static __inline uint32_t
2910 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2911 {
2912 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2913
2914 b += addr[5] << 8;
2915 b += addr[4];
2916 a += addr[3] << 24;
2917 a += addr[2] << 16;
2918 a += addr[1] << 8;
2919 a += addr[0];
2920
2921 mix(a, b, c);
2922
2923 return (c & BRIDGE_RTHASH_MASK);
2924 }
2925
2926 #undef mix
2927
2928 static int
2929 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2930 {
2931 int i, d;
2932
2933 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2934 d = ((int)a[i]) - ((int)b[i]);
2935 }
2936
2937 return (d);
2938 }
2939
2940 /*
2941 * bridge_rtnode_lookup:
2942 *
2943 * Look up a bridge route node for the specified destination. Compare the
2944 * vlan id or if zero then just return the first match.
2945 */
2946 static struct bridge_rtnode *
2947 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2948 {
2949 struct bridge_rtnode *brt;
2950 uint32_t hash;
2951 int dir;
2952
2953 BRIDGE_LOCK_ASSERT(sc);
2954
2955 hash = bridge_rthash(sc, addr);
2956 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2957 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2958 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2959 return (brt);
2960 if (dir > 0)
2961 return (NULL);
2962 }
2963
2964 return (NULL);
2965 }
2966
2967 /*
2968 * bridge_rtnode_insert:
2969 *
2970 * Insert the specified bridge node into the route table. We
2971 * assume the entry is not already in the table.
2972 */
2973 static int
2974 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2975 {
2976 struct bridge_rtnode *lbrt;
2977 uint32_t hash;
2978 int dir;
2979
2980 BRIDGE_LOCK_ASSERT(sc);
2981
2982 hash = bridge_rthash(sc, brt->brt_addr);
2983
2984 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2985 if (lbrt == NULL) {
2986 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2987 goto out;
2988 }
2989
2990 do {
2991 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2992 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2993 return (EEXIST);
2994 if (dir > 0) {
2995 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2996 goto out;
2997 }
2998 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2999 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3000 goto out;
3001 }
3002 lbrt = LIST_NEXT(lbrt, brt_hash);
3003 } while (lbrt != NULL);
3004
3005 #ifdef DIAGNOSTIC
3006 panic("bridge_rtnode_insert: impossible");
3007 #endif
3008
3009 out:
3010 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3011 sc->sc_brtcnt++;
3012
3013 return (0);
3014 }
3015
3016 /*
3017 * bridge_rtnode_destroy:
3018 *
3019 * Destroy a bridge rtnode.
3020 */
3021 static void
3022 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3023 {
3024 BRIDGE_LOCK_ASSERT(sc);
3025
3026 LIST_REMOVE(brt, brt_hash);
3027
3028 LIST_REMOVE(brt, brt_list);
3029 sc->sc_brtcnt--;
3030 brt->brt_dst->bif_addrcnt--;
3031 uma_zfree(bridge_rtnode_zone, brt);
3032 }
3033
3034 /*
3035 * bridge_rtable_expire:
3036 *
3037 * Set the expiry time for all routes on an interface.
3038 */
3039 static void
3040 bridge_rtable_expire(struct ifnet *ifp, int age)
3041 {
3042 struct bridge_softc *sc = ifp->if_bridge;
3043 struct bridge_rtnode *brt;
3044
3045 BRIDGE_LOCK(sc);
3046
3047 /*
3048 * If the age is zero then flush, otherwise set all the expiry times to
3049 * age for the interface
3050 */
3051 if (age == 0)
3052 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3053 else {
3054 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3055 /* Cap the expiry time to 'age' */
3056 if (brt->brt_ifp == ifp &&
3057 brt->brt_expire > time_uptime + age &&
3058 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3059 brt->brt_expire = time_uptime + age;
3060 }
3061 }
3062 BRIDGE_UNLOCK(sc);
3063 }
3064
3065 /*
3066 * bridge_state_change:
3067 *
3068 * Callback from the bridgestp code when a port changes states.
3069 */
3070 static void
3071 bridge_state_change(struct ifnet *ifp, int state)
3072 {
3073 struct bridge_softc *sc = ifp->if_bridge;
3074 static const char *stpstates[] = {
3075 "disabled",
3076 "listening",
3077 "learning",
3078 "forwarding",
3079 "blocking",
3080 "discarding"
3081 };
3082
3083 CURVNET_SET(ifp->if_vnet);
3084 if (V_log_stp)
3085 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3086 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3087 CURVNET_RESTORE();
3088 }
3089
3090 /*
3091 * Send bridge packets through pfil if they are one of the types pfil can deal
3092 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3093 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3094 * that interface.
3095 */
3096 static int
3097 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3098 {
3099 int snap, error, i, hlen;
3100 struct ether_header *eh1, eh2;
3101 struct ip *ip;
3102 struct llc llc1;
3103 u_int16_t ether_type;
3104
3105 snap = 0;
3106 error = -1; /* Default error if not error == 0 */
3107
3108 #if 0
3109 /* we may return with the IP fields swapped, ensure its not shared */
3110 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3111 #endif
3112
3113 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3114 return (0); /* filtering is disabled */
3115
3116 i = min((*mp)->m_pkthdr.len, max_protohdr);
3117 if ((*mp)->m_len < i) {
3118 *mp = m_pullup(*mp, i);
3119 if (*mp == NULL) {
3120 printf("%s: m_pullup failed\n", __func__);
3121 return (-1);
3122 }
3123 }
3124
3125 eh1 = mtod(*mp, struct ether_header *);
3126 ether_type = ntohs(eh1->ether_type);
3127
3128 /*
3129 * Check for SNAP/LLC.
3130 */
3131 if (ether_type < ETHERMTU) {
3132 struct llc *llc2 = (struct llc *)(eh1 + 1);
3133
3134 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3135 llc2->llc_dsap == LLC_SNAP_LSAP &&
3136 llc2->llc_ssap == LLC_SNAP_LSAP &&
3137 llc2->llc_control == LLC_UI) {
3138 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3139 snap = 1;
3140 }
3141 }
3142
3143 /*
3144 * If we're trying to filter bridge traffic, don't look at anything
3145 * other than IP and ARP traffic. If the filter doesn't understand
3146 * IPv6, don't allow IPv6 through the bridge either. This is lame
3147 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3148 * but of course we don't have an AppleTalk filter to begin with.
3149 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3150 * ARP traffic.)
3151 */
3152 switch (ether_type) {
3153 case ETHERTYPE_ARP:
3154 case ETHERTYPE_REVARP:
3155 if (V_pfil_ipfw_arp == 0)
3156 return (0); /* Automatically pass */
3157 break;
3158
3159 case ETHERTYPE_IP:
3160 #ifdef INET6
3161 case ETHERTYPE_IPV6:
3162 #endif /* INET6 */
3163 break;
3164 default:
3165 /*
3166 * Check to see if the user wants to pass non-ip
3167 * packets, these will not be checked by pfil(9) and
3168 * passed unconditionally so the default is to drop.
3169 */
3170 if (V_pfil_onlyip)
3171 goto bad;
3172 }
3173
3174 /* Run the packet through pfil before stripping link headers */
3175 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
3176 dir == PFIL_OUT && ifp != NULL) {
3177
3178 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, 0,
3179 NULL);
3180
3181 if (*mp == NULL || error != 0) /* packet consumed by filter */
3182 return (error);
3183 }
3184
3185 /* Strip off the Ethernet header and keep a copy. */
3186 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3187 m_adj(*mp, ETHER_HDR_LEN);
3188
3189 /* Strip off snap header, if present */
3190 if (snap) {
3191 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3192 m_adj(*mp, sizeof(struct llc));
3193 }
3194
3195 /*
3196 * Check the IP header for alignment and errors
3197 */
3198 if (dir == PFIL_IN) {
3199 switch (ether_type) {
3200 case ETHERTYPE_IP:
3201 error = bridge_ip_checkbasic(mp);
3202 break;
3203 #ifdef INET6
3204 case ETHERTYPE_IPV6:
3205 error = bridge_ip6_checkbasic(mp);
3206 break;
3207 #endif /* INET6 */
3208 default:
3209 error = 0;
3210 }
3211 if (error)
3212 goto bad;
3213 }
3214
3215 error = 0;
3216
3217 /*
3218 * Run the packet through pfil
3219 */
3220 switch (ether_type) {
3221 case ETHERTYPE_IP:
3222 /*
3223 * Run pfil on the member interface and the bridge, both can
3224 * be skipped by clearing pfil_member or pfil_bridge.
3225 *
3226 * Keep the order:
3227 * in_if -> bridge_if -> out_if
3228 */
3229 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3230 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3231 dir, 0, NULL);
3232
3233 if (*mp == NULL || error != 0) /* filter may consume */
3234 break;
3235
3236 if (V_pfil_member && ifp != NULL)
3237 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3238 dir, 0, NULL);
3239
3240 if (*mp == NULL || error != 0) /* filter may consume */
3241 break;
3242
3243 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3244 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3245 dir, 0, NULL);
3246
3247 if (*mp == NULL || error != 0) /* filter may consume */
3248 break;
3249
3250 /* check if we need to fragment the packet */
3251 /* bridge_fragment generates a mbuf chain of packets */
3252 /* that already include eth headers */
3253 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3254 i = (*mp)->m_pkthdr.len;
3255 if (i > ifp->if_mtu) {
3256 error = bridge_fragment(ifp, mp, &eh2, snap,
3257 &llc1);
3258 return (error);
3259 }
3260 }
3261
3262 /* Recalculate the ip checksum. */
3263 ip = mtod(*mp, struct ip *);
3264 hlen = ip->ip_hl << 2;
3265 if (hlen < sizeof(struct ip))
3266 goto bad;
3267 if (hlen > (*mp)->m_len) {
3268 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3269 goto bad;
3270 ip = mtod(*mp, struct ip *);
3271 if (ip == NULL)
3272 goto bad;
3273 }
3274 ip->ip_sum = 0;
3275 if (hlen == sizeof(struct ip))
3276 ip->ip_sum = in_cksum_hdr(ip);
3277 else
3278 ip->ip_sum = in_cksum(*mp, hlen);
3279
3280 break;
3281 #ifdef INET6
3282 case ETHERTYPE_IPV6:
3283 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3284 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3285 dir, 0, NULL);
3286
3287 if (*mp == NULL || error != 0) /* filter may consume */
3288 break;
3289
3290 if (V_pfil_member && ifp != NULL)
3291 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3292 dir, 0, NULL);
3293
3294 if (*mp == NULL || error != 0) /* filter may consume */
3295 break;
3296
3297 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3298 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3299 dir, 0, NULL);
3300 break;
3301 #endif
3302 default:
3303 error = 0;
3304 break;
3305 }
3306
3307 if (*mp == NULL)
3308 return (error);
3309 if (error != 0)
3310 goto bad;
3311
3312 error = -1;
3313
3314 /*
3315 * Finally, put everything back the way it was and return
3316 */
3317 if (snap) {
3318 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3319 if (*mp == NULL)
3320 return (error);
3321 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3322 }
3323
3324 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3325 if (*mp == NULL)
3326 return (error);
3327 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3328
3329 return (0);
3330
3331 bad:
3332 m_freem(*mp);
3333 *mp = NULL;
3334 return (error);
3335 }
3336
3337 /*
3338 * Perform basic checks on header size since
3339 * pfil assumes ip_input has already processed
3340 * it for it. Cut-and-pasted from ip_input.c.
3341 * Given how simple the IPv6 version is,
3342 * does the IPv4 version really need to be
3343 * this complicated?
3344 *
3345 * XXX Should we update ipstat here, or not?
3346 * XXX Right now we update ipstat but not
3347 * XXX csum_counter.
3348 */
3349 static int
3350 bridge_ip_checkbasic(struct mbuf **mp)
3351 {
3352 struct mbuf *m = *mp;
3353 struct ip *ip;
3354 int len, hlen;
3355 u_short sum;
3356
3357 if (*mp == NULL)
3358 return (-1);
3359
3360 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3361 if ((m = m_copyup(m, sizeof(struct ip),
3362 (max_linkhdr + 3) & ~3)) == NULL) {
3363 /* XXXJRT new stat, please */
3364 KMOD_IPSTAT_INC(ips_toosmall);
3365 goto bad;
3366 }
3367 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3368 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3369 KMOD_IPSTAT_INC(ips_toosmall);
3370 goto bad;
3371 }
3372 }
3373 ip = mtod(m, struct ip *);
3374 if (ip == NULL) goto bad;
3375
3376 if (ip->ip_v != IPVERSION) {
3377 KMOD_IPSTAT_INC(ips_badvers);
3378 goto bad;
3379 }
3380 hlen = ip->ip_hl << 2;
3381 if (hlen < sizeof(struct ip)) { /* minimum header length */
3382 KMOD_IPSTAT_INC(ips_badhlen);
3383 goto bad;
3384 }
3385 if (hlen > m->m_len) {
3386 if ((m = m_pullup(m, hlen)) == NULL) {
3387 KMOD_IPSTAT_INC(ips_badhlen);
3388 goto bad;
3389 }
3390 ip = mtod(m, struct ip *);
3391 if (ip == NULL) goto bad;
3392 }
3393
3394 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3395 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3396 } else {
3397 if (hlen == sizeof(struct ip)) {
3398 sum = in_cksum_hdr(ip);
3399 } else {
3400 sum = in_cksum(m, hlen);
3401 }
3402 }
3403 if (sum) {
3404 KMOD_IPSTAT_INC(ips_badsum);
3405 goto bad;
3406 }
3407
3408 /* Retrieve the packet length. */
3409 len = ntohs(ip->ip_len);
3410
3411 /*
3412 * Check for additional length bogosity
3413 */
3414 if (len < hlen) {
3415 KMOD_IPSTAT_INC(ips_badlen);
3416 goto bad;
3417 }
3418
3419 /*
3420 * Check that the amount of data in the buffers
3421 * is as at least much as the IP header would have us expect.
3422 * Drop packet if shorter than we expect.
3423 */
3424 if (m->m_pkthdr.len < len) {
3425 KMOD_IPSTAT_INC(ips_tooshort);
3426 goto bad;
3427 }
3428
3429 /* Checks out, proceed */
3430 *mp = m;
3431 return (0);
3432
3433 bad:
3434 *mp = m;
3435 return (-1);
3436 }
3437
3438 #ifdef INET6
3439 /*
3440 * Same as above, but for IPv6.
3441 * Cut-and-pasted from ip6_input.c.
3442 * XXX Should we update ip6stat, or not?
3443 */
3444 static int
3445 bridge_ip6_checkbasic(struct mbuf **mp)
3446 {
3447 struct mbuf *m = *mp;
3448 struct ip6_hdr *ip6;
3449
3450 /*
3451 * If the IPv6 header is not aligned, slurp it up into a new
3452 * mbuf with space for link headers, in the event we forward
3453 * it. Otherwise, if it is aligned, make sure the entire base
3454 * IPv6 header is in the first mbuf of the chain.
3455 */
3456 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3457 struct ifnet *inifp = m->m_pkthdr.rcvif;
3458 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3459 (max_linkhdr + 3) & ~3)) == NULL) {
3460 /* XXXJRT new stat, please */
3461 IP6STAT_INC(ip6s_toosmall);
3462 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3463 goto bad;
3464 }
3465 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3466 struct ifnet *inifp = m->m_pkthdr.rcvif;
3467 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3468 IP6STAT_INC(ip6s_toosmall);
3469 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3470 goto bad;
3471 }
3472 }
3473
3474 ip6 = mtod(m, struct ip6_hdr *);
3475
3476 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3477 IP6STAT_INC(ip6s_badvers);
3478 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3479 goto bad;
3480 }
3481
3482 /* Checks out, proceed */
3483 *mp = m;
3484 return (0);
3485
3486 bad:
3487 *mp = m;
3488 return (-1);
3489 }
3490 #endif /* INET6 */
3491
3492 /*
3493 * bridge_fragment:
3494 *
3495 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3496 */
3497 static int
3498 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3499 int snap, struct llc *llc)
3500 {
3501 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3502 struct ip *ip;
3503 int error = -1;
3504
3505 if (m->m_len < sizeof(struct ip) &&
3506 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3507 goto dropit;
3508 ip = mtod(m, struct ip *);
3509
3510 m->m_pkthdr.csum_flags |= CSUM_IP;
3511 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3512 if (error)
3513 goto dropit;
3514
3515 /*
3516 * Walk the chain and re-add the Ethernet header for
3517 * each mbuf packet.
3518 */
3519 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3520 nextpkt = mcur->m_nextpkt;
3521 mcur->m_nextpkt = NULL;
3522 if (snap) {
3523 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3524 if (mcur == NULL) {
3525 error = ENOBUFS;
3526 if (mprev != NULL)
3527 mprev->m_nextpkt = nextpkt;
3528 goto dropit;
3529 }
3530 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3531 }
3532
3533 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3534 if (mcur == NULL) {
3535 error = ENOBUFS;
3536 if (mprev != NULL)
3537 mprev->m_nextpkt = nextpkt;
3538 goto dropit;
3539 }
3540 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3541
3542 /*
3543 * The previous two M_PREPEND could have inserted one or two
3544 * mbufs in front so we have to update the previous packet's
3545 * m_nextpkt.
3546 */
3547 mcur->m_nextpkt = nextpkt;
3548 if (mprev != NULL)
3549 mprev->m_nextpkt = mcur;
3550 else {
3551 /* The first mbuf in the original chain needs to be
3552 * updated. */
3553 *mp = mcur;
3554 }
3555 mprev = mcur;
3556 }
3557
3558 KMOD_IPSTAT_INC(ips_fragmented);
3559 return (error);
3560
3561 dropit:
3562 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3563 m = mcur->m_nextpkt;
3564 m_freem(mcur);
3565 }
3566 return (error);
3567 }
3568
3569 static void
3570 bridge_linkstate(struct ifnet *ifp)
3571 {
3572 struct bridge_softc *sc = ifp->if_bridge;
3573 struct bridge_iflist *bif;
3574
3575 BRIDGE_LOCK(sc);
3576 bif = bridge_lookup_member_if(sc, ifp);
3577 if (bif == NULL) {
3578 BRIDGE_UNLOCK(sc);
3579 return;
3580 }
3581 bridge_linkcheck(sc);
3582 BRIDGE_UNLOCK(sc);
3583
3584 bstp_linkstate(&bif->bif_stp);
3585 }
3586
3587 static void
3588 bridge_linkcheck(struct bridge_softc *sc)
3589 {
3590 struct bridge_iflist *bif;
3591 int new_link, hasls;
3592
3593 BRIDGE_LOCK_ASSERT(sc);
3594 new_link = LINK_STATE_DOWN;
3595 hasls = 0;
3596 /* Our link is considered up if at least one of our ports is active */
3597 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3598 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3599 hasls++;
3600 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3601 new_link = LINK_STATE_UP;
3602 break;
3603 }
3604 }
3605 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3606 /* If no interfaces support link-state then we default to up */
3607 new_link = LINK_STATE_UP;
3608 }
3609 if_link_state_change(sc->sc_ifp, new_link);
3610 }
Cache object: 1e365bfa4a3039096f549c3dc2ed2a0b
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