1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright 2001 Wasabi Systems, Inc.
7 * All rights reserved.
8 *
9 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed for the NetBSD Project by
22 * Wasabi Systems, Inc.
23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
24 * or promote products derived from this software without specific prior
25 * written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 /*
41 * Copyright (c) 1999, 2000 Jason L. Wright ([email protected])
42 * All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
63 * POSSIBILITY OF SUCH DAMAGE.
64 *
65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
66 */
67
68 /*
69 * Network interface bridge support.
70 *
71 * TODO:
72 *
73 * - Currently only supports Ethernet-like interfaces (Ethernet,
74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
75 * to bridge other types of interfaces (maybe consider
76 * heterogeneous bridges).
77 */
78
79 #include <sys/cdefs.h>
80 __FBSDID("$FreeBSD$");
81
82 #include "opt_inet.h"
83 #include "opt_inet6.h"
84
85 #include <sys/param.h>
86 #include <sys/eventhandler.h>
87 #include <sys/mbuf.h>
88 #include <sys/malloc.h>
89 #include <sys/protosw.h>
90 #include <sys/systm.h>
91 #include <sys/jail.h>
92 #include <sys/time.h>
93 #include <sys/socket.h> /* for net/if.h */
94 #include <sys/sockio.h>
95 #include <sys/ctype.h> /* string functions */
96 #include <sys/kernel.h>
97 #include <sys/random.h>
98 #include <sys/syslog.h>
99 #include <sys/sysctl.h>
100 #include <vm/uma.h>
101 #include <sys/module.h>
102 #include <sys/priv.h>
103 #include <sys/proc.h>
104 #include <sys/lock.h>
105 #include <sys/mutex.h>
106
107 #include <net/bpf.h>
108 #include <net/if.h>
109 #include <net/if_clone.h>
110 #include <net/if_dl.h>
111 #include <net/if_types.h>
112 #include <net/if_var.h>
113 #include <net/pfil.h>
114 #include <net/vnet.h>
115
116 #include <netinet/in.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
121 #ifdef INET6
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
124 #include <netinet6/in6_ifattach.h>
125 #endif
126 #if defined(INET) || defined(INET6)
127 #include <netinet/ip_carp.h>
128 #endif
129 #include <machine/in_cksum.h>
130 #include <netinet/if_ether.h>
131 #include <net/bridgestp.h>
132 #include <net/if_bridgevar.h>
133 #include <net/if_llc.h>
134 #include <net/if_vlan_var.h>
135
136 #include <net/route.h>
137
138 #ifdef INET6
139 /*
140 * XXX: declare here to avoid to include many inet6 related files..
141 * should be more generalized?
142 */
143 extern void nd6_setmtu(struct ifnet *);
144 #endif
145
146 /*
147 * Size of the route hash table. Must be a power of two.
148 */
149 #ifndef BRIDGE_RTHASH_SIZE
150 #define BRIDGE_RTHASH_SIZE 1024
151 #endif
152
153 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
154
155 /*
156 * Default maximum number of addresses to cache.
157 */
158 #ifndef BRIDGE_RTABLE_MAX
159 #define BRIDGE_RTABLE_MAX 2000
160 #endif
161
162 /*
163 * Timeout (in seconds) for entries learned dynamically.
164 */
165 #ifndef BRIDGE_RTABLE_TIMEOUT
166 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
167 #endif
168
169 /*
170 * Number of seconds between walks of the route list.
171 */
172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
173 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
174 #endif
175
176 /*
177 * List of capabilities to possibly mask on the member interface.
178 */
179 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
180 IFCAP_TXCSUM_IPV6)
181
182 /*
183 * List of capabilities to strip
184 */
185 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
186
187 /*
188 * Bridge locking
189 *
190 * The bridge relies heavily on the epoch(9) system to protect its data
191 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we
192 * must ensure there is only one writer at a time.
193 *
194 * That is: for read accesses we only need to be in NET_EPOCH, but for write
195 * accesses we must hold:
196 *
197 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes
198 * - BRIDGE_LOCK, for any other change
199 *
200 * The BRIDGE_LOCK is a sleepable lock, because it is held accross ioctl()
201 * calls to bridge member interfaces and these ioctl()s can sleep.
202 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes
203 * required while we're in NET_EPOCH and then we're not allowed to sleep.
204 */
205 #define BRIDGE_LOCK_INIT(_sc) do { \
206 sx_init(&(_sc)->sc_sx, "if_bridge"); \
207 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \
208 } while (0)
209 #define BRIDGE_LOCK_DESTROY(_sc) do { \
210 sx_destroy(&(_sc)->sc_sx); \
211 mtx_destroy(&(_sc)->sc_rt_mtx); \
212 } while (0)
213 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx)
214 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx)
215 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED)
216 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
217 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx))
218 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED)
219 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx)
220 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx)
221 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED)
222 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
223 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx))
224
225 /*
226 * Bridge interface list entry.
227 */
228 struct bridge_iflist {
229 CK_LIST_ENTRY(bridge_iflist) bif_next;
230 struct ifnet *bif_ifp; /* member if */
231 struct bstp_port bif_stp; /* STP state */
232 uint32_t bif_flags; /* member if flags */
233 int bif_savedcaps; /* saved capabilities */
234 uint32_t bif_addrmax; /* max # of addresses */
235 uint32_t bif_addrcnt; /* cur. # of addresses */
236 uint32_t bif_addrexceeded;/* # of address violations */
237 struct epoch_context bif_epoch_ctx;
238 };
239
240 /*
241 * Bridge route node.
242 */
243 struct bridge_rtnode {
244 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
245 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
246 struct bridge_iflist *brt_dst; /* destination if */
247 unsigned long brt_expire; /* expiration time */
248 uint8_t brt_flags; /* address flags */
249 uint8_t brt_addr[ETHER_ADDR_LEN];
250 uint16_t brt_vlan; /* vlan id */
251 struct vnet *brt_vnet;
252 struct epoch_context brt_epoch_ctx;
253 };
254 #define brt_ifp brt_dst->bif_ifp
255
256 /*
257 * Software state for each bridge.
258 */
259 struct bridge_softc {
260 struct ifnet *sc_ifp; /* make this an interface */
261 LIST_ENTRY(bridge_softc) sc_list;
262 struct sx sc_sx;
263 struct mtx sc_rt_mtx;
264 uint32_t sc_brtmax; /* max # of addresses */
265 uint32_t sc_brtcnt; /* cur. # of addresses */
266 uint32_t sc_brttimeout; /* rt timeout in seconds */
267 struct callout sc_brcallout; /* bridge callout */
268 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
269 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
270 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
271 uint32_t sc_rthash_key; /* key for hash */
272 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
273 struct bstp_state sc_stp; /* STP state */
274 uint32_t sc_brtexceeded; /* # of cache drops */
275 struct ifnet *sc_ifaddr; /* member mac copied from */
276 struct ether_addr sc_defaddr; /* Default MAC address */
277 struct epoch_context sc_epoch_ctx;
278 };
279
280 VNET_DEFINE_STATIC(struct sx, bridge_list_sx);
281 #define V_bridge_list_sx VNET(bridge_list_sx)
282 static eventhandler_tag bridge_detach_cookie;
283
284 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
285
286 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
287 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone)
288
289 static int bridge_clone_create(struct if_clone *, int, caddr_t);
290 static void bridge_clone_destroy(struct ifnet *);
291
292 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
293 static void bridge_mutecaps(struct bridge_softc *);
294 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
295 int);
296 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
297 static void bridge_init(void *);
298 static void bridge_dummynet(struct mbuf *, struct ifnet *);
299 static void bridge_stop(struct ifnet *, int);
300 static int bridge_transmit(struct ifnet *, struct mbuf *);
301 #ifdef ALTQ
302 static void bridge_altq_start(if_t);
303 static int bridge_altq_transmit(if_t, struct mbuf *);
304 #endif
305 static void bridge_qflush(struct ifnet *);
306 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
307 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
308 struct rtentry *);
309 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
310 struct mbuf *);
311 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
312
313 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
314 struct mbuf *m);
315
316 static void bridge_timer(void *);
317
318 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
319 struct mbuf *, int);
320 static void bridge_span(struct bridge_softc *, struct mbuf *);
321
322 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
323 uint16_t, struct bridge_iflist *, int, uint8_t);
324 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
325 uint16_t);
326 static void bridge_rttrim(struct bridge_softc *);
327 static void bridge_rtage(struct bridge_softc *);
328 static void bridge_rtflush(struct bridge_softc *, int);
329 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
330 uint16_t);
331
332 static void bridge_rtable_init(struct bridge_softc *);
333 static void bridge_rtable_fini(struct bridge_softc *);
334
335 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
336 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
337 const uint8_t *, uint16_t);
338 static int bridge_rtnode_insert(struct bridge_softc *,
339 struct bridge_rtnode *);
340 static void bridge_rtnode_destroy(struct bridge_softc *,
341 struct bridge_rtnode *);
342 static void bridge_rtable_expire(struct ifnet *, int);
343 static void bridge_state_change(struct ifnet *, int);
344
345 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
346 const char *name);
347 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
348 struct ifnet *ifp);
349 static void bridge_delete_member(struct bridge_softc *,
350 struct bridge_iflist *, int);
351 static void bridge_delete_span(struct bridge_softc *,
352 struct bridge_iflist *);
353
354 static int bridge_ioctl_add(struct bridge_softc *, void *);
355 static int bridge_ioctl_del(struct bridge_softc *, void *);
356 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
357 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
358 static int bridge_ioctl_scache(struct bridge_softc *, void *);
359 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
360 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
361 static int bridge_ioctl_rts(struct bridge_softc *, void *);
362 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
363 static int bridge_ioctl_sto(struct bridge_softc *, void *);
364 static int bridge_ioctl_gto(struct bridge_softc *, void *);
365 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
366 static int bridge_ioctl_flush(struct bridge_softc *, void *);
367 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
368 static int bridge_ioctl_spri(struct bridge_softc *, void *);
369 static int bridge_ioctl_ght(struct bridge_softc *, void *);
370 static int bridge_ioctl_sht(struct bridge_softc *, void *);
371 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
372 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
373 static int bridge_ioctl_gma(struct bridge_softc *, void *);
374 static int bridge_ioctl_sma(struct bridge_softc *, void *);
375 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
376 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
377 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
378 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
379 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
380 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
381 static int bridge_ioctl_grte(struct bridge_softc *, void *);
382 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
383 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
384 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
385 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
386 int);
387 static int bridge_ip_checkbasic(struct mbuf **mp);
388 #ifdef INET6
389 static int bridge_ip6_checkbasic(struct mbuf **mp);
390 #endif /* INET6 */
391 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
392 struct ether_header *, int, struct llc *);
393 static void bridge_linkstate(struct ifnet *ifp);
394 static void bridge_linkcheck(struct bridge_softc *sc);
395
396 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
397 #define VLANTAGOF(_m) \
398 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
399
400 static struct bstp_cb_ops bridge_ops = {
401 .bcb_state = bridge_state_change,
402 .bcb_rtage = bridge_rtable_expire
403 };
404
405 SYSCTL_DECL(_net_link);
406 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
407 "Bridge");
408
409 /* only pass IP[46] packets when pfil is enabled */
410 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
411 #define V_pfil_onlyip VNET(pfil_onlyip)
412 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
413 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
414 "Only pass IP packets when pfil is enabled");
415
416 /* run pfil hooks on the bridge interface */
417 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
418 #define V_pfil_bridge VNET(pfil_bridge)
419 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
420 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
421 "Packet filter on the bridge interface");
422
423 /* layer2 filter with ipfw */
424 VNET_DEFINE_STATIC(int, pfil_ipfw);
425 #define V_pfil_ipfw VNET(pfil_ipfw)
426
427 /* layer2 ARP filter with ipfw */
428 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
429 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
430 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
431 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
432 "Filter ARP packets through IPFW layer2");
433
434 /* run pfil hooks on the member interface */
435 VNET_DEFINE_STATIC(int, pfil_member) = 1;
436 #define V_pfil_member VNET(pfil_member)
437 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
438 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
439 "Packet filter on the member interface");
440
441 /* run pfil hooks on the physical interface for locally destined packets */
442 VNET_DEFINE_STATIC(int, pfil_local_phys);
443 #define V_pfil_local_phys VNET(pfil_local_phys)
444 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
445 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
446 "Packet filter on the physical interface for locally destined packets");
447
448 /* log STP state changes */
449 VNET_DEFINE_STATIC(int, log_stp);
450 #define V_log_stp VNET(log_stp)
451 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
452 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
453 "Log STP state changes");
454
455 /* share MAC with first bridge member */
456 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
457 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
458 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
459 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
460 "Inherit MAC address from the first bridge member");
461
462 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
463 #define V_allow_llz_overlap VNET(allow_llz_overlap)
464 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
465 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
466 "Allow overlap of link-local scope "
467 "zones of a bridge interface and the member interfaces");
468
469 struct bridge_control {
470 int (*bc_func)(struct bridge_softc *, void *);
471 int bc_argsize;
472 int bc_flags;
473 };
474
475 #define BC_F_COPYIN 0x01 /* copy arguments in */
476 #define BC_F_COPYOUT 0x02 /* copy arguments out */
477 #define BC_F_SUSER 0x04 /* do super-user check */
478
479 const struct bridge_control bridge_control_table[] = {
480 { bridge_ioctl_add, sizeof(struct ifbreq),
481 BC_F_COPYIN|BC_F_SUSER },
482 { bridge_ioctl_del, sizeof(struct ifbreq),
483 BC_F_COPYIN|BC_F_SUSER },
484
485 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
486 BC_F_COPYIN|BC_F_COPYOUT },
487 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
488 BC_F_COPYIN|BC_F_SUSER },
489
490 { bridge_ioctl_scache, sizeof(struct ifbrparam),
491 BC_F_COPYIN|BC_F_SUSER },
492 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
493 BC_F_COPYOUT },
494
495 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
496 BC_F_COPYIN|BC_F_COPYOUT },
497 { bridge_ioctl_rts, sizeof(struct ifbaconf),
498 BC_F_COPYIN|BC_F_COPYOUT },
499
500 { bridge_ioctl_saddr, sizeof(struct ifbareq),
501 BC_F_COPYIN|BC_F_SUSER },
502
503 { bridge_ioctl_sto, sizeof(struct ifbrparam),
504 BC_F_COPYIN|BC_F_SUSER },
505 { bridge_ioctl_gto, sizeof(struct ifbrparam),
506 BC_F_COPYOUT },
507
508 { bridge_ioctl_daddr, sizeof(struct ifbareq),
509 BC_F_COPYIN|BC_F_SUSER },
510
511 { bridge_ioctl_flush, sizeof(struct ifbreq),
512 BC_F_COPYIN|BC_F_SUSER },
513
514 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
515 BC_F_COPYOUT },
516 { bridge_ioctl_spri, sizeof(struct ifbrparam),
517 BC_F_COPYIN|BC_F_SUSER },
518
519 { bridge_ioctl_ght, sizeof(struct ifbrparam),
520 BC_F_COPYOUT },
521 { bridge_ioctl_sht, sizeof(struct ifbrparam),
522 BC_F_COPYIN|BC_F_SUSER },
523
524 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
525 BC_F_COPYOUT },
526 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
527 BC_F_COPYIN|BC_F_SUSER },
528
529 { bridge_ioctl_gma, sizeof(struct ifbrparam),
530 BC_F_COPYOUT },
531 { bridge_ioctl_sma, sizeof(struct ifbrparam),
532 BC_F_COPYIN|BC_F_SUSER },
533
534 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
535 BC_F_COPYIN|BC_F_SUSER },
536
537 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
538 BC_F_COPYIN|BC_F_SUSER },
539
540 { bridge_ioctl_addspan, sizeof(struct ifbreq),
541 BC_F_COPYIN|BC_F_SUSER },
542 { bridge_ioctl_delspan, sizeof(struct ifbreq),
543 BC_F_COPYIN|BC_F_SUSER },
544
545 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
546 BC_F_COPYOUT },
547
548 { bridge_ioctl_grte, sizeof(struct ifbrparam),
549 BC_F_COPYOUT },
550
551 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
552 BC_F_COPYIN|BC_F_COPYOUT },
553
554 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
555 BC_F_COPYIN|BC_F_SUSER },
556
557 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
558 BC_F_COPYIN|BC_F_SUSER },
559
560 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
561 BC_F_COPYIN|BC_F_SUSER },
562
563 };
564 const int bridge_control_table_size = nitems(bridge_control_table);
565
566 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
567 #define V_bridge_list VNET(bridge_list)
568 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \
569 "if_bridge list")
570 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx)
571 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx)
572 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx)
573
574 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
575 #define V_bridge_cloner VNET(bridge_cloner)
576
577 static const char bridge_name[] = "bridge";
578
579 static void
vnet_bridge_init(const void * unused __unused)580 vnet_bridge_init(const void *unused __unused)
581 {
582
583 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
584 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
585 UMA_ALIGN_PTR, 0);
586 BRIDGE_LIST_LOCK_INIT();
587 LIST_INIT(&V_bridge_list);
588 V_bridge_cloner = if_clone_simple(bridge_name,
589 bridge_clone_create, bridge_clone_destroy, 0);
590 }
591 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
592 vnet_bridge_init, NULL);
593
594 static void
vnet_bridge_uninit(const void * unused __unused)595 vnet_bridge_uninit(const void *unused __unused)
596 {
597
598 if_clone_detach(V_bridge_cloner);
599 V_bridge_cloner = NULL;
600 BRIDGE_LIST_LOCK_DESTROY();
601
602 /* Callbacks may use the UMA zone. */
603 epoch_drain_callbacks(net_epoch_preempt);
604
605 uma_zdestroy(V_bridge_rtnode_zone);
606 }
607 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
608 vnet_bridge_uninit, NULL);
609
610 static int
bridge_modevent(module_t mod,int type,void * data)611 bridge_modevent(module_t mod, int type, void *data)
612 {
613
614 switch (type) {
615 case MOD_LOAD:
616 bridge_dn_p = bridge_dummynet;
617 bridge_detach_cookie = EVENTHANDLER_REGISTER(
618 ifnet_departure_event, bridge_ifdetach, NULL,
619 EVENTHANDLER_PRI_ANY);
620 break;
621 case MOD_UNLOAD:
622 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
623 bridge_detach_cookie);
624 bridge_dn_p = NULL;
625 break;
626 default:
627 return (EOPNOTSUPP);
628 }
629 return (0);
630 }
631
632 static moduledata_t bridge_mod = {
633 "if_bridge",
634 bridge_modevent,
635 0
636 };
637
638 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
639 MODULE_VERSION(if_bridge, 1);
640 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
641
642 /*
643 * handler for net.link.bridge.ipfw
644 */
645 static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)646 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
647 {
648 int enable = V_pfil_ipfw;
649 int error;
650
651 error = sysctl_handle_int(oidp, &enable, 0, req);
652 enable &= 1;
653
654 if (enable != V_pfil_ipfw) {
655 V_pfil_ipfw = enable;
656
657 /*
658 * Disable pfil so that ipfw doesnt run twice, if the user
659 * really wants both then they can re-enable pfil_bridge and/or
660 * pfil_member. Also allow non-ip packets as ipfw can filter by
661 * layer2 type.
662 */
663 if (V_pfil_ipfw) {
664 V_pfil_onlyip = 0;
665 V_pfil_bridge = 0;
666 V_pfil_member = 0;
667 }
668 }
669
670 return (error);
671 }
672 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
673 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
674 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
675 "Layer2 filter with IPFW");
676
677 #ifdef VIMAGE
678 static void
bridge_reassign(struct ifnet * ifp,struct vnet * newvnet,char * arg)679 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg)
680 {
681 struct bridge_softc *sc = ifp->if_softc;
682 struct bridge_iflist *bif;
683
684 BRIDGE_LOCK(sc);
685
686 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
687 bridge_delete_member(sc, bif, 0);
688
689 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
690 bridge_delete_span(sc, bif);
691 }
692
693 BRIDGE_UNLOCK(sc);
694
695 ether_reassign(ifp, newvnet, arg);
696 }
697 #endif
698
699 /*
700 * bridge_clone_create:
701 *
702 * Create a new bridge instance.
703 */
704 static int
bridge_clone_create(struct if_clone * ifc,int unit,caddr_t params)705 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
706 {
707 struct bridge_softc *sc;
708 struct ifnet *ifp;
709
710 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
711 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
712 if (ifp == NULL) {
713 free(sc, M_DEVBUF);
714 return (ENOSPC);
715 }
716
717 BRIDGE_LOCK_INIT(sc);
718 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
719 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
720
721 /* Initialize our routing table. */
722 bridge_rtable_init(sc);
723
724 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0);
725
726 CK_LIST_INIT(&sc->sc_iflist);
727 CK_LIST_INIT(&sc->sc_spanlist);
728
729 ifp->if_softc = sc;
730 if_initname(ifp, bridge_name, unit);
731 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
732 ifp->if_ioctl = bridge_ioctl;
733 #ifdef ALTQ
734 ifp->if_start = bridge_altq_start;
735 ifp->if_transmit = bridge_altq_transmit;
736 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
737 ifp->if_snd.ifq_drv_maxlen = 0;
738 IFQ_SET_READY(&ifp->if_snd);
739 #else
740 ifp->if_transmit = bridge_transmit;
741 #endif
742 ifp->if_qflush = bridge_qflush;
743 ifp->if_init = bridge_init;
744 ifp->if_type = IFT_BRIDGE;
745
746 ether_gen_addr(ifp, &sc->sc_defaddr);
747
748 bstp_attach(&sc->sc_stp, &bridge_ops);
749 ether_ifattach(ifp, sc->sc_defaddr.octet);
750 /* Now undo some of the damage... */
751 ifp->if_baudrate = 0;
752 ifp->if_type = IFT_BRIDGE;
753 #ifdef VIMAGE
754 ifp->if_reassign = bridge_reassign;
755 #endif
756
757 BRIDGE_LIST_LOCK();
758 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
759 BRIDGE_LIST_UNLOCK();
760
761 return (0);
762 }
763
764 static void
bridge_clone_destroy_cb(struct epoch_context * ctx)765 bridge_clone_destroy_cb(struct epoch_context *ctx)
766 {
767 struct bridge_softc *sc;
768
769 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx);
770
771 BRIDGE_LOCK_DESTROY(sc);
772 free(sc, M_DEVBUF);
773 }
774
775 /*
776 * bridge_clone_destroy:
777 *
778 * Destroy a bridge instance.
779 */
780 static void
bridge_clone_destroy(struct ifnet * ifp)781 bridge_clone_destroy(struct ifnet *ifp)
782 {
783 struct bridge_softc *sc = ifp->if_softc;
784 struct bridge_iflist *bif;
785 struct epoch_tracker et;
786
787 BRIDGE_LOCK(sc);
788
789 bridge_stop(ifp, 1);
790 ifp->if_flags &= ~IFF_UP;
791
792 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
793 bridge_delete_member(sc, bif, 0);
794
795 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
796 bridge_delete_span(sc, bif);
797 }
798
799 /* Tear down the routing table. */
800 bridge_rtable_fini(sc);
801
802 BRIDGE_UNLOCK(sc);
803
804 NET_EPOCH_ENTER(et);
805
806 callout_drain(&sc->sc_brcallout);
807
808 BRIDGE_LIST_LOCK();
809 LIST_REMOVE(sc, sc_list);
810 BRIDGE_LIST_UNLOCK();
811
812 bstp_detach(&sc->sc_stp);
813 #ifdef ALTQ
814 IFQ_PURGE(&ifp->if_snd);
815 #endif
816 NET_EPOCH_EXIT(et);
817
818 ether_ifdetach(ifp);
819 if_free(ifp);
820
821 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx);
822 }
823
824 /*
825 * bridge_ioctl:
826 *
827 * Handle a control request from the operator.
828 */
829 static int
bridge_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)830 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
831 {
832 struct bridge_softc *sc = ifp->if_softc;
833 struct ifreq *ifr = (struct ifreq *)data;
834 struct bridge_iflist *bif;
835 struct thread *td = curthread;
836 union {
837 struct ifbreq ifbreq;
838 struct ifbifconf ifbifconf;
839 struct ifbareq ifbareq;
840 struct ifbaconf ifbaconf;
841 struct ifbrparam ifbrparam;
842 struct ifbropreq ifbropreq;
843 } args;
844 struct ifdrv *ifd = (struct ifdrv *) data;
845 const struct bridge_control *bc;
846 int error = 0, oldmtu;
847
848 BRIDGE_LOCK(sc);
849
850 switch (cmd) {
851 case SIOCADDMULTI:
852 case SIOCDELMULTI:
853 break;
854
855 case SIOCGDRVSPEC:
856 case SIOCSDRVSPEC:
857 if (ifd->ifd_cmd >= bridge_control_table_size) {
858 error = EINVAL;
859 break;
860 }
861 bc = &bridge_control_table[ifd->ifd_cmd];
862
863 if (cmd == SIOCGDRVSPEC &&
864 (bc->bc_flags & BC_F_COPYOUT) == 0) {
865 error = EINVAL;
866 break;
867 }
868 else if (cmd == SIOCSDRVSPEC &&
869 (bc->bc_flags & BC_F_COPYOUT) != 0) {
870 error = EINVAL;
871 break;
872 }
873
874 if (bc->bc_flags & BC_F_SUSER) {
875 error = priv_check(td, PRIV_NET_BRIDGE);
876 if (error)
877 break;
878 }
879
880 if (ifd->ifd_len != bc->bc_argsize ||
881 ifd->ifd_len > sizeof(args)) {
882 error = EINVAL;
883 break;
884 }
885
886 bzero(&args, sizeof(args));
887 if (bc->bc_flags & BC_F_COPYIN) {
888 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
889 if (error)
890 break;
891 }
892
893 oldmtu = ifp->if_mtu;
894 error = (*bc->bc_func)(sc, &args);
895 if (error)
896 break;
897
898 /*
899 * Bridge MTU may change during addition of the first port.
900 * If it did, do network layer specific procedure.
901 */
902 if (ifp->if_mtu != oldmtu) {
903 #ifdef INET6
904 nd6_setmtu(ifp);
905 #endif
906 rt_updatemtu(ifp);
907 }
908
909 if (bc->bc_flags & BC_F_COPYOUT)
910 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
911
912 break;
913
914 case SIOCSIFFLAGS:
915 if (!(ifp->if_flags & IFF_UP) &&
916 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
917 /*
918 * If interface is marked down and it is running,
919 * then stop and disable it.
920 */
921 bridge_stop(ifp, 1);
922 } else if ((ifp->if_flags & IFF_UP) &&
923 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
924 /*
925 * If interface is marked up and it is stopped, then
926 * start it.
927 */
928 BRIDGE_UNLOCK(sc);
929 (*ifp->if_init)(sc);
930 BRIDGE_LOCK(sc);
931 }
932 break;
933
934 case SIOCSIFMTU:
935 if (ifr->ifr_mtu < 576) {
936 error = EINVAL;
937 break;
938 }
939 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
940 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
941 break;
942 }
943 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
944 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
945 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
946 " != %d\n", sc->sc_ifp->if_xname,
947 bif->bif_ifp->if_mtu,
948 bif->bif_ifp->if_xname, ifr->ifr_mtu);
949 error = EINVAL;
950 break;
951 }
952 }
953 if (!error)
954 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
955 break;
956 default:
957 /*
958 * drop the lock as ether_ioctl() will call bridge_start() and
959 * cause the lock to be recursed.
960 */
961 BRIDGE_UNLOCK(sc);
962 error = ether_ioctl(ifp, cmd, data);
963 BRIDGE_LOCK(sc);
964 break;
965 }
966
967 BRIDGE_UNLOCK(sc);
968
969 return (error);
970 }
971
972 /*
973 * bridge_mutecaps:
974 *
975 * Clear or restore unwanted capabilities on the member interface
976 */
977 static void
bridge_mutecaps(struct bridge_softc * sc)978 bridge_mutecaps(struct bridge_softc *sc)
979 {
980 struct bridge_iflist *bif;
981 int enabled, mask;
982
983 BRIDGE_LOCK_ASSERT(sc);
984
985 /* Initial bitmask of capabilities to test */
986 mask = BRIDGE_IFCAPS_MASK;
987
988 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
989 /* Every member must support it or its disabled */
990 mask &= bif->bif_savedcaps;
991 }
992
993 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
994 enabled = bif->bif_ifp->if_capenable;
995 enabled &= ~BRIDGE_IFCAPS_STRIP;
996 /* strip off mask bits and enable them again if allowed */
997 enabled &= ~BRIDGE_IFCAPS_MASK;
998 enabled |= mask;
999 bridge_set_ifcap(sc, bif, enabled);
1000 }
1001 }
1002
1003 static void
bridge_set_ifcap(struct bridge_softc * sc,struct bridge_iflist * bif,int set)1004 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
1005 {
1006 struct ifnet *ifp = bif->bif_ifp;
1007 struct ifreq ifr;
1008 int error, mask, stuck;
1009
1010 bzero(&ifr, sizeof(ifr));
1011 ifr.ifr_reqcap = set;
1012
1013 if (ifp->if_capenable != set) {
1014 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
1015 if (error)
1016 if_printf(sc->sc_ifp,
1017 "error setting capabilities on %s: %d\n",
1018 ifp->if_xname, error);
1019 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1020 stuck = ifp->if_capenable & mask & ~set;
1021 if (stuck != 0)
1022 if_printf(sc->sc_ifp,
1023 "can't disable some capabilities on %s: 0x%x\n",
1024 ifp->if_xname, stuck);
1025 }
1026 }
1027
1028 /*
1029 * bridge_lookup_member:
1030 *
1031 * Lookup a bridge member interface.
1032 */
1033 static struct bridge_iflist *
bridge_lookup_member(struct bridge_softc * sc,const char * name)1034 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1035 {
1036 struct bridge_iflist *bif;
1037 struct ifnet *ifp;
1038
1039 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1040
1041 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1042 ifp = bif->bif_ifp;
1043 if (strcmp(ifp->if_xname, name) == 0)
1044 return (bif);
1045 }
1046
1047 return (NULL);
1048 }
1049
1050 /*
1051 * bridge_lookup_member_if:
1052 *
1053 * Lookup a bridge member interface by ifnet*.
1054 */
1055 static struct bridge_iflist *
bridge_lookup_member_if(struct bridge_softc * sc,struct ifnet * member_ifp)1056 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1057 {
1058 struct bridge_iflist *bif;
1059
1060 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1061
1062 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1063 if (bif->bif_ifp == member_ifp)
1064 return (bif);
1065 }
1066
1067 return (NULL);
1068 }
1069
1070 static void
bridge_delete_member_cb(struct epoch_context * ctx)1071 bridge_delete_member_cb(struct epoch_context *ctx)
1072 {
1073 struct bridge_iflist *bif;
1074
1075 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx);
1076
1077 free(bif, M_DEVBUF);
1078 }
1079
1080 /*
1081 * bridge_delete_member:
1082 *
1083 * Delete the specified member interface.
1084 */
1085 static void
bridge_delete_member(struct bridge_softc * sc,struct bridge_iflist * bif,int gone)1086 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1087 int gone)
1088 {
1089 struct ifnet *ifs = bif->bif_ifp;
1090 struct ifnet *fif = NULL;
1091 struct bridge_iflist *bifl;
1092
1093 BRIDGE_LOCK_ASSERT(sc);
1094
1095 if (bif->bif_flags & IFBIF_STP)
1096 bstp_disable(&bif->bif_stp);
1097
1098 ifs->if_bridge = NULL;
1099 CK_LIST_REMOVE(bif, bif_next);
1100
1101 /*
1102 * If removing the interface that gave the bridge its mac address, set
1103 * the mac address of the bridge to the address of the next member, or
1104 * to its default address if no members are left.
1105 */
1106 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1107 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1108 bcopy(&sc->sc_defaddr,
1109 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1110 sc->sc_ifaddr = NULL;
1111 } else {
1112 bifl = CK_LIST_FIRST(&sc->sc_iflist);
1113 fif = bifl->bif_ifp;
1114 bcopy(IF_LLADDR(fif),
1115 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1116 sc->sc_ifaddr = fif;
1117 }
1118 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1119 }
1120
1121 bridge_linkcheck(sc);
1122 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1123 BRIDGE_RT_LOCK(sc);
1124 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1125 BRIDGE_RT_UNLOCK(sc);
1126 KASSERT(bif->bif_addrcnt == 0,
1127 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1128
1129 ifs->if_bridge_output = NULL;
1130 ifs->if_bridge_input = NULL;
1131 ifs->if_bridge_linkstate = NULL;
1132 if (!gone) {
1133 switch (ifs->if_type) {
1134 case IFT_ETHER:
1135 case IFT_L2VLAN:
1136 /*
1137 * Take the interface out of promiscuous mode, but only
1138 * if it was promiscuous in the first place. It might
1139 * not be if we're in the bridge_ioctl_add() error path.
1140 */
1141 if (ifs->if_flags & IFF_PROMISC)
1142 (void) ifpromisc(ifs, 0);
1143 break;
1144
1145 case IFT_GIF:
1146 break;
1147
1148 default:
1149 #ifdef DIAGNOSTIC
1150 panic("bridge_delete_member: impossible");
1151 #endif
1152 break;
1153 }
1154 /* reneable any interface capabilities */
1155 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1156 }
1157 bstp_destroy(&bif->bif_stp); /* prepare to free */
1158
1159 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1160 }
1161
1162 /*
1163 * bridge_delete_span:
1164 *
1165 * Delete the specified span interface.
1166 */
1167 static void
bridge_delete_span(struct bridge_softc * sc,struct bridge_iflist * bif)1168 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1169 {
1170 BRIDGE_LOCK_ASSERT(sc);
1171
1172 KASSERT(bif->bif_ifp->if_bridge == NULL,
1173 ("%s: not a span interface", __func__));
1174
1175 CK_LIST_REMOVE(bif, bif_next);
1176
1177 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1178 }
1179
1180 static int
bridge_ioctl_add(struct bridge_softc * sc,void * arg)1181 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1182 {
1183 struct ifbreq *req = arg;
1184 struct bridge_iflist *bif = NULL;
1185 struct ifnet *ifs;
1186 int error = 0;
1187
1188 ifs = ifunit(req->ifbr_ifsname);
1189 if (ifs == NULL)
1190 return (ENOENT);
1191 if (ifs->if_ioctl == NULL) /* must be supported */
1192 return (EINVAL);
1193
1194 /* If it's in the span list, it can't be a member. */
1195 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1196 if (ifs == bif->bif_ifp)
1197 return (EBUSY);
1198
1199 if (ifs->if_bridge == sc)
1200 return (EEXIST);
1201
1202 if (ifs->if_bridge != NULL)
1203 return (EBUSY);
1204
1205 switch (ifs->if_type) {
1206 case IFT_ETHER:
1207 case IFT_L2VLAN:
1208 case IFT_GIF:
1209 /* permitted interface types */
1210 break;
1211 default:
1212 return (EINVAL);
1213 }
1214
1215 #ifdef INET6
1216 /*
1217 * Two valid inet6 addresses with link-local scope must not be
1218 * on the parent interface and the member interfaces at the
1219 * same time. This restriction is needed to prevent violation
1220 * of link-local scope zone. Attempts to add a member
1221 * interface which has inet6 addresses when the parent has
1222 * inet6 triggers removal of all inet6 addresses on the member
1223 * interface.
1224 */
1225
1226 /* Check if the parent interface has a link-local scope addr. */
1227 if (V_allow_llz_overlap == 0 &&
1228 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1229 /*
1230 * If any, remove all inet6 addresses from the member
1231 * interfaces.
1232 */
1233 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1234 if (in6ifa_llaonifp(bif->bif_ifp)) {
1235 in6_ifdetach(bif->bif_ifp);
1236 if_printf(sc->sc_ifp,
1237 "IPv6 addresses on %s have been removed "
1238 "before adding it as a member to prevent "
1239 "IPv6 address scope violation.\n",
1240 bif->bif_ifp->if_xname);
1241 }
1242 }
1243 if (in6ifa_llaonifp(ifs)) {
1244 in6_ifdetach(ifs);
1245 if_printf(sc->sc_ifp,
1246 "IPv6 addresses on %s have been removed "
1247 "before adding it as a member to prevent "
1248 "IPv6 address scope violation.\n",
1249 ifs->if_xname);
1250 }
1251 }
1252 #endif
1253 /* Allow the first Ethernet member to define the MTU */
1254 if (CK_LIST_EMPTY(&sc->sc_iflist))
1255 sc->sc_ifp->if_mtu = ifs->if_mtu;
1256 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1257 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1258 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1259 return (EINVAL);
1260 }
1261
1262 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1263 if (bif == NULL)
1264 return (ENOMEM);
1265
1266 bif->bif_ifp = ifs;
1267 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1268 bif->bif_savedcaps = ifs->if_capenable;
1269
1270 /*
1271 * Assign the interface's MAC address to the bridge if it's the first
1272 * member and the MAC address of the bridge has not been changed from
1273 * the default randomly generated one.
1274 */
1275 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1276 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1277 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1278 sc->sc_ifaddr = ifs;
1279 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1280 }
1281
1282 ifs->if_bridge = sc;
1283 ifs->if_bridge_output = bridge_output;
1284 ifs->if_bridge_input = bridge_input;
1285 ifs->if_bridge_linkstate = bridge_linkstate;
1286 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1287 /*
1288 * XXX: XLOCK HERE!?!
1289 *
1290 * NOTE: insert_***HEAD*** should be safe for the traversals.
1291 */
1292 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1293
1294 /* Set interface capabilities to the intersection set of all members */
1295 bridge_mutecaps(sc);
1296 bridge_linkcheck(sc);
1297
1298 /* Place the interface into promiscuous mode */
1299 switch (ifs->if_type) {
1300 case IFT_ETHER:
1301 case IFT_L2VLAN:
1302 error = ifpromisc(ifs, 1);
1303 break;
1304 }
1305
1306 if (error)
1307 bridge_delete_member(sc, bif, 0);
1308 return (error);
1309 }
1310
1311 static int
bridge_ioctl_del(struct bridge_softc * sc,void * arg)1312 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1313 {
1314 struct ifbreq *req = arg;
1315 struct bridge_iflist *bif;
1316
1317 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1318 if (bif == NULL)
1319 return (ENOENT);
1320
1321 bridge_delete_member(sc, bif, 0);
1322
1323 return (0);
1324 }
1325
1326 static int
bridge_ioctl_gifflags(struct bridge_softc * sc,void * arg)1327 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1328 {
1329 struct ifbreq *req = arg;
1330 struct bridge_iflist *bif;
1331 struct bstp_port *bp;
1332
1333 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1334 if (bif == NULL)
1335 return (ENOENT);
1336
1337 bp = &bif->bif_stp;
1338 req->ifbr_ifsflags = bif->bif_flags;
1339 req->ifbr_state = bp->bp_state;
1340 req->ifbr_priority = bp->bp_priority;
1341 req->ifbr_path_cost = bp->bp_path_cost;
1342 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1343 req->ifbr_proto = bp->bp_protover;
1344 req->ifbr_role = bp->bp_role;
1345 req->ifbr_stpflags = bp->bp_flags;
1346 req->ifbr_addrcnt = bif->bif_addrcnt;
1347 req->ifbr_addrmax = bif->bif_addrmax;
1348 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1349
1350 /* Copy STP state options as flags */
1351 if (bp->bp_operedge)
1352 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1353 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1354 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1355 if (bp->bp_ptp_link)
1356 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1357 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1358 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1359 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1360 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1361 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1362 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1363 return (0);
1364 }
1365
1366 static int
bridge_ioctl_sifflags(struct bridge_softc * sc,void * arg)1367 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1368 {
1369 struct epoch_tracker et;
1370 struct ifbreq *req = arg;
1371 struct bridge_iflist *bif;
1372 struct bstp_port *bp;
1373 int error;
1374
1375 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1376 if (bif == NULL)
1377 return (ENOENT);
1378 bp = &bif->bif_stp;
1379
1380 if (req->ifbr_ifsflags & IFBIF_SPAN)
1381 /* SPAN is readonly */
1382 return (EINVAL);
1383
1384 NET_EPOCH_ENTER(et);
1385
1386 if (req->ifbr_ifsflags & IFBIF_STP) {
1387 if ((bif->bif_flags & IFBIF_STP) == 0) {
1388 error = bstp_enable(&bif->bif_stp);
1389 if (error) {
1390 NET_EPOCH_EXIT(et);
1391 return (error);
1392 }
1393 }
1394 } else {
1395 if ((bif->bif_flags & IFBIF_STP) != 0)
1396 bstp_disable(&bif->bif_stp);
1397 }
1398
1399 /* Pass on STP flags */
1400 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1401 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1402 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1403 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1404
1405 /* Save the bits relating to the bridge */
1406 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1407
1408 NET_EPOCH_EXIT(et);
1409
1410 return (0);
1411 }
1412
1413 static int
bridge_ioctl_scache(struct bridge_softc * sc,void * arg)1414 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1415 {
1416 struct ifbrparam *param = arg;
1417
1418 sc->sc_brtmax = param->ifbrp_csize;
1419 bridge_rttrim(sc);
1420
1421 return (0);
1422 }
1423
1424 static int
bridge_ioctl_gcache(struct bridge_softc * sc,void * arg)1425 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1426 {
1427 struct ifbrparam *param = arg;
1428
1429 param->ifbrp_csize = sc->sc_brtmax;
1430
1431 return (0);
1432 }
1433
1434 static int
bridge_ioctl_gifs(struct bridge_softc * sc,void * arg)1435 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1436 {
1437 struct ifbifconf *bifc = arg;
1438 struct bridge_iflist *bif;
1439 struct ifbreq breq;
1440 char *buf, *outbuf;
1441 int count, buflen, len, error = 0;
1442
1443 count = 0;
1444 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1445 count++;
1446 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1447 count++;
1448
1449 buflen = sizeof(breq) * count;
1450 if (bifc->ifbic_len == 0) {
1451 bifc->ifbic_len = buflen;
1452 return (0);
1453 }
1454 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1455 if (outbuf == NULL)
1456 return (ENOMEM);
1457
1458 count = 0;
1459 buf = outbuf;
1460 len = min(bifc->ifbic_len, buflen);
1461 bzero(&breq, sizeof(breq));
1462 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1463 if (len < sizeof(breq))
1464 break;
1465
1466 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1467 sizeof(breq.ifbr_ifsname));
1468 /* Fill in the ifbreq structure */
1469 error = bridge_ioctl_gifflags(sc, &breq);
1470 if (error)
1471 break;
1472 memcpy(buf, &breq, sizeof(breq));
1473 count++;
1474 buf += sizeof(breq);
1475 len -= sizeof(breq);
1476 }
1477 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1478 if (len < sizeof(breq))
1479 break;
1480
1481 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1482 sizeof(breq.ifbr_ifsname));
1483 breq.ifbr_ifsflags = bif->bif_flags;
1484 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1485 memcpy(buf, &breq, sizeof(breq));
1486 count++;
1487 buf += sizeof(breq);
1488 len -= sizeof(breq);
1489 }
1490
1491 bifc->ifbic_len = sizeof(breq) * count;
1492 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1493 free(outbuf, M_TEMP);
1494 return (error);
1495 }
1496
1497 static int
bridge_ioctl_rts(struct bridge_softc * sc,void * arg)1498 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1499 {
1500 struct ifbaconf *bac = arg;
1501 struct bridge_rtnode *brt;
1502 struct ifbareq bareq;
1503 char *buf, *outbuf;
1504 int count, buflen, len, error = 0;
1505
1506 if (bac->ifbac_len == 0)
1507 return (0);
1508
1509 count = 0;
1510 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1511 count++;
1512 buflen = sizeof(bareq) * count;
1513
1514 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1515 if (outbuf == NULL)
1516 return (ENOMEM);
1517
1518 count = 0;
1519 buf = outbuf;
1520 len = min(bac->ifbac_len, buflen);
1521 bzero(&bareq, sizeof(bareq));
1522 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1523 if (len < sizeof(bareq))
1524 goto out;
1525 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1526 sizeof(bareq.ifba_ifsname));
1527 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1528 bareq.ifba_vlan = brt->brt_vlan;
1529 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1530 time_uptime < brt->brt_expire)
1531 bareq.ifba_expire = brt->brt_expire - time_uptime;
1532 else
1533 bareq.ifba_expire = 0;
1534 bareq.ifba_flags = brt->brt_flags;
1535
1536 memcpy(buf, &bareq, sizeof(bareq));
1537 count++;
1538 buf += sizeof(bareq);
1539 len -= sizeof(bareq);
1540 }
1541 out:
1542 bac->ifbac_len = sizeof(bareq) * count;
1543 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1544 free(outbuf, M_TEMP);
1545 return (error);
1546 }
1547
1548 static int
bridge_ioctl_saddr(struct bridge_softc * sc,void * arg)1549 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1550 {
1551 struct ifbareq *req = arg;
1552 struct bridge_iflist *bif;
1553 struct epoch_tracker et;
1554 int error;
1555
1556 NET_EPOCH_ENTER(et);
1557 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1558 if (bif == NULL) {
1559 NET_EPOCH_EXIT(et);
1560 return (ENOENT);
1561 }
1562
1563 /* bridge_rtupdate() may acquire the lock. */
1564 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1565 req->ifba_flags);
1566 NET_EPOCH_EXIT(et);
1567
1568 return (error);
1569 }
1570
1571 static int
bridge_ioctl_sto(struct bridge_softc * sc,void * arg)1572 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1573 {
1574 struct ifbrparam *param = arg;
1575
1576 sc->sc_brttimeout = param->ifbrp_ctime;
1577 return (0);
1578 }
1579
1580 static int
bridge_ioctl_gto(struct bridge_softc * sc,void * arg)1581 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1582 {
1583 struct ifbrparam *param = arg;
1584
1585 param->ifbrp_ctime = sc->sc_brttimeout;
1586 return (0);
1587 }
1588
1589 static int
bridge_ioctl_daddr(struct bridge_softc * sc,void * arg)1590 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1591 {
1592 struct ifbareq *req = arg;
1593
1594 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1595 }
1596
1597 static int
bridge_ioctl_flush(struct bridge_softc * sc,void * arg)1598 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1599 {
1600 struct ifbreq *req = arg;
1601
1602 BRIDGE_RT_LOCK(sc);
1603 bridge_rtflush(sc, req->ifbr_ifsflags);
1604 BRIDGE_RT_UNLOCK(sc);
1605
1606 return (0);
1607 }
1608
1609 static int
bridge_ioctl_gpri(struct bridge_softc * sc,void * arg)1610 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1611 {
1612 struct ifbrparam *param = arg;
1613 struct bstp_state *bs = &sc->sc_stp;
1614
1615 param->ifbrp_prio = bs->bs_bridge_priority;
1616 return (0);
1617 }
1618
1619 static int
bridge_ioctl_spri(struct bridge_softc * sc,void * arg)1620 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1621 {
1622 struct ifbrparam *param = arg;
1623
1624 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1625 }
1626
1627 static int
bridge_ioctl_ght(struct bridge_softc * sc,void * arg)1628 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1629 {
1630 struct ifbrparam *param = arg;
1631 struct bstp_state *bs = &sc->sc_stp;
1632
1633 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1634 return (0);
1635 }
1636
1637 static int
bridge_ioctl_sht(struct bridge_softc * sc,void * arg)1638 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1639 {
1640 struct ifbrparam *param = arg;
1641
1642 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1643 }
1644
1645 static int
bridge_ioctl_gfd(struct bridge_softc * sc,void * arg)1646 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1647 {
1648 struct ifbrparam *param = arg;
1649 struct bstp_state *bs = &sc->sc_stp;
1650
1651 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1652 return (0);
1653 }
1654
1655 static int
bridge_ioctl_sfd(struct bridge_softc * sc,void * arg)1656 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1657 {
1658 struct ifbrparam *param = arg;
1659
1660 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1661 }
1662
1663 static int
bridge_ioctl_gma(struct bridge_softc * sc,void * arg)1664 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1665 {
1666 struct ifbrparam *param = arg;
1667 struct bstp_state *bs = &sc->sc_stp;
1668
1669 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1670 return (0);
1671 }
1672
1673 static int
bridge_ioctl_sma(struct bridge_softc * sc,void * arg)1674 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1675 {
1676 struct ifbrparam *param = arg;
1677
1678 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1679 }
1680
1681 static int
bridge_ioctl_sifprio(struct bridge_softc * sc,void * arg)1682 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1683 {
1684 struct ifbreq *req = arg;
1685 struct bridge_iflist *bif;
1686
1687 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1688 if (bif == NULL)
1689 return (ENOENT);
1690
1691 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1692 }
1693
1694 static int
bridge_ioctl_sifcost(struct bridge_softc * sc,void * arg)1695 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1696 {
1697 struct ifbreq *req = arg;
1698 struct bridge_iflist *bif;
1699
1700 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1701 if (bif == NULL)
1702 return (ENOENT);
1703
1704 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1705 }
1706
1707 static int
bridge_ioctl_sifmaxaddr(struct bridge_softc * sc,void * arg)1708 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1709 {
1710 struct ifbreq *req = arg;
1711 struct bridge_iflist *bif;
1712
1713 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1714 if (bif == NULL)
1715 return (ENOENT);
1716
1717 bif->bif_addrmax = req->ifbr_addrmax;
1718 return (0);
1719 }
1720
1721 static int
bridge_ioctl_addspan(struct bridge_softc * sc,void * arg)1722 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1723 {
1724 struct ifbreq *req = arg;
1725 struct bridge_iflist *bif = NULL;
1726 struct ifnet *ifs;
1727
1728 ifs = ifunit(req->ifbr_ifsname);
1729 if (ifs == NULL)
1730 return (ENOENT);
1731
1732 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1733 if (ifs == bif->bif_ifp)
1734 return (EBUSY);
1735
1736 if (ifs->if_bridge != NULL)
1737 return (EBUSY);
1738
1739 switch (ifs->if_type) {
1740 case IFT_ETHER:
1741 case IFT_GIF:
1742 case IFT_L2VLAN:
1743 break;
1744 default:
1745 return (EINVAL);
1746 }
1747
1748 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1749 if (bif == NULL)
1750 return (ENOMEM);
1751
1752 bif->bif_ifp = ifs;
1753 bif->bif_flags = IFBIF_SPAN;
1754
1755 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1756
1757 return (0);
1758 }
1759
1760 static int
bridge_ioctl_delspan(struct bridge_softc * sc,void * arg)1761 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1762 {
1763 struct ifbreq *req = arg;
1764 struct bridge_iflist *bif;
1765 struct ifnet *ifs;
1766
1767 ifs = ifunit(req->ifbr_ifsname);
1768 if (ifs == NULL)
1769 return (ENOENT);
1770
1771 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1772 if (ifs == bif->bif_ifp)
1773 break;
1774
1775 if (bif == NULL)
1776 return (ENOENT);
1777
1778 bridge_delete_span(sc, bif);
1779
1780 return (0);
1781 }
1782
1783 static int
bridge_ioctl_gbparam(struct bridge_softc * sc,void * arg)1784 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1785 {
1786 struct ifbropreq *req = arg;
1787 struct bstp_state *bs = &sc->sc_stp;
1788 struct bstp_port *root_port;
1789
1790 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1791 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1792 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1793
1794 root_port = bs->bs_root_port;
1795 if (root_port == NULL)
1796 req->ifbop_root_port = 0;
1797 else
1798 req->ifbop_root_port = root_port->bp_ifp->if_index;
1799
1800 req->ifbop_holdcount = bs->bs_txholdcount;
1801 req->ifbop_priority = bs->bs_bridge_priority;
1802 req->ifbop_protocol = bs->bs_protover;
1803 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1804 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1805 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1806 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1807 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1808 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1809
1810 return (0);
1811 }
1812
1813 static int
bridge_ioctl_grte(struct bridge_softc * sc,void * arg)1814 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1815 {
1816 struct ifbrparam *param = arg;
1817
1818 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1819 return (0);
1820 }
1821
1822 static int
bridge_ioctl_gifsstp(struct bridge_softc * sc,void * arg)1823 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1824 {
1825 struct ifbpstpconf *bifstp = arg;
1826 struct bridge_iflist *bif;
1827 struct bstp_port *bp;
1828 struct ifbpstpreq bpreq;
1829 char *buf, *outbuf;
1830 int count, buflen, len, error = 0;
1831
1832 count = 0;
1833 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1834 if ((bif->bif_flags & IFBIF_STP) != 0)
1835 count++;
1836 }
1837
1838 buflen = sizeof(bpreq) * count;
1839 if (bifstp->ifbpstp_len == 0) {
1840 bifstp->ifbpstp_len = buflen;
1841 return (0);
1842 }
1843
1844 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1845 if (outbuf == NULL)
1846 return (ENOMEM);
1847
1848 count = 0;
1849 buf = outbuf;
1850 len = min(bifstp->ifbpstp_len, buflen);
1851 bzero(&bpreq, sizeof(bpreq));
1852 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1853 if (len < sizeof(bpreq))
1854 break;
1855
1856 if ((bif->bif_flags & IFBIF_STP) == 0)
1857 continue;
1858
1859 bp = &bif->bif_stp;
1860 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1861 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1862 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1863 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1864 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1865 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1866
1867 memcpy(buf, &bpreq, sizeof(bpreq));
1868 count++;
1869 buf += sizeof(bpreq);
1870 len -= sizeof(bpreq);
1871 }
1872
1873 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1874 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1875 free(outbuf, M_TEMP);
1876 return (error);
1877 }
1878
1879 static int
bridge_ioctl_sproto(struct bridge_softc * sc,void * arg)1880 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1881 {
1882 struct ifbrparam *param = arg;
1883
1884 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1885 }
1886
1887 static int
bridge_ioctl_stxhc(struct bridge_softc * sc,void * arg)1888 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1889 {
1890 struct ifbrparam *param = arg;
1891
1892 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1893 }
1894
1895 /*
1896 * bridge_ifdetach:
1897 *
1898 * Detach an interface from a bridge. Called when a member
1899 * interface is detaching.
1900 */
1901 static void
bridge_ifdetach(void * arg __unused,struct ifnet * ifp)1902 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1903 {
1904 struct bridge_softc *sc = ifp->if_bridge;
1905 struct bridge_iflist *bif;
1906
1907 if (ifp->if_flags & IFF_RENAMING)
1908 return;
1909 if (V_bridge_cloner == NULL) {
1910 /*
1911 * This detach handler can be called after
1912 * vnet_bridge_uninit(). Just return in that case.
1913 */
1914 return;
1915 }
1916 /* Check if the interface is a bridge member */
1917 if (sc != NULL) {
1918 BRIDGE_LOCK(sc);
1919
1920 bif = bridge_lookup_member_if(sc, ifp);
1921 if (bif != NULL)
1922 bridge_delete_member(sc, bif, 1);
1923
1924 BRIDGE_UNLOCK(sc);
1925 return;
1926 }
1927
1928 /* Check if the interface is a span port */
1929 BRIDGE_LIST_LOCK();
1930 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1931 BRIDGE_LOCK(sc);
1932 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1933 if (ifp == bif->bif_ifp) {
1934 bridge_delete_span(sc, bif);
1935 break;
1936 }
1937
1938 BRIDGE_UNLOCK(sc);
1939 }
1940 BRIDGE_LIST_UNLOCK();
1941 }
1942
1943 /*
1944 * bridge_init:
1945 *
1946 * Initialize a bridge interface.
1947 */
1948 static void
bridge_init(void * xsc)1949 bridge_init(void *xsc)
1950 {
1951 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1952 struct ifnet *ifp = sc->sc_ifp;
1953
1954 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1955 return;
1956
1957 BRIDGE_LOCK(sc);
1958 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1959 bridge_timer, sc);
1960
1961 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1962 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1963
1964 BRIDGE_UNLOCK(sc);
1965 }
1966
1967 /*
1968 * bridge_stop:
1969 *
1970 * Stop the bridge interface.
1971 */
1972 static void
bridge_stop(struct ifnet * ifp,int disable)1973 bridge_stop(struct ifnet *ifp, int disable)
1974 {
1975 struct bridge_softc *sc = ifp->if_softc;
1976
1977 BRIDGE_LOCK_ASSERT(sc);
1978
1979 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1980 return;
1981
1982 BRIDGE_RT_LOCK(sc);
1983 callout_stop(&sc->sc_brcallout);
1984
1985 bstp_stop(&sc->sc_stp);
1986
1987 bridge_rtflush(sc, IFBF_FLUSHDYN);
1988 BRIDGE_RT_UNLOCK(sc);
1989
1990 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1991 }
1992
1993 /*
1994 * bridge_enqueue:
1995 *
1996 * Enqueue a packet on a bridge member interface.
1997 *
1998 */
1999 static int
bridge_enqueue(struct bridge_softc * sc,struct ifnet * dst_ifp,struct mbuf * m)2000 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
2001 {
2002 int len, err = 0;
2003 short mflags;
2004 struct mbuf *m0;
2005
2006 /* We may be sending a fragment so traverse the mbuf */
2007 for (; m; m = m0) {
2008 m0 = m->m_nextpkt;
2009 m->m_nextpkt = NULL;
2010 len = m->m_pkthdr.len;
2011 mflags = m->m_flags;
2012
2013 /*
2014 * If underlying interface can not do VLAN tag insertion itself
2015 * then attach a packet tag that holds it.
2016 */
2017 if ((m->m_flags & M_VLANTAG) &&
2018 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
2019 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2020 if (m == NULL) {
2021 if_printf(dst_ifp,
2022 "unable to prepend VLAN header\n");
2023 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
2024 continue;
2025 }
2026 m->m_flags &= ~M_VLANTAG;
2027 }
2028
2029 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
2030 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
2031 m_freem(m0);
2032 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2033 break;
2034 }
2035
2036 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2037 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2038 if (mflags & M_MCAST)
2039 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2040 }
2041
2042 return (err);
2043 }
2044
2045 /*
2046 * bridge_dummynet:
2047 *
2048 * Receive a queued packet from dummynet and pass it on to the output
2049 * interface.
2050 *
2051 * The mbuf has the Ethernet header already attached.
2052 */
2053 static void
bridge_dummynet(struct mbuf * m,struct ifnet * ifp)2054 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2055 {
2056 struct bridge_softc *sc;
2057
2058 sc = ifp->if_bridge;
2059
2060 /*
2061 * The packet didnt originate from a member interface. This should only
2062 * ever happen if a member interface is removed while packets are
2063 * queued for it.
2064 */
2065 if (sc == NULL) {
2066 m_freem(m);
2067 return;
2068 }
2069
2070 if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2071 #ifdef INET6
2072 || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2073 #endif
2074 ) {
2075 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2076 return;
2077 if (m == NULL)
2078 return;
2079 }
2080
2081 bridge_enqueue(sc, ifp, m);
2082 }
2083
2084 /*
2085 * bridge_output:
2086 *
2087 * Send output from a bridge member interface. This
2088 * performs the bridging function for locally originated
2089 * packets.
2090 *
2091 * The mbuf has the Ethernet header already attached. We must
2092 * enqueue or free the mbuf before returning.
2093 */
2094 static int
bridge_output(struct ifnet * ifp,struct mbuf * m,struct sockaddr * sa,struct rtentry * rt)2095 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2096 struct rtentry *rt)
2097 {
2098 struct ether_header *eh;
2099 struct ifnet *bifp, *dst_if;
2100 struct bridge_softc *sc;
2101 uint16_t vlan;
2102
2103 NET_EPOCH_ASSERT();
2104
2105 if (m->m_len < ETHER_HDR_LEN) {
2106 m = m_pullup(m, ETHER_HDR_LEN);
2107 if (m == NULL)
2108 return (0);
2109 }
2110
2111 eh = mtod(m, struct ether_header *);
2112 sc = ifp->if_bridge;
2113 vlan = VLANTAGOF(m);
2114
2115 bifp = sc->sc_ifp;
2116
2117 /*
2118 * If bridge is down, but the original output interface is up,
2119 * go ahead and send out that interface. Otherwise, the packet
2120 * is dropped below.
2121 */
2122 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2123 dst_if = ifp;
2124 goto sendunicast;
2125 }
2126
2127 /*
2128 * If the packet is a multicast, or we don't know a better way to
2129 * get there, send to all interfaces.
2130 */
2131 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2132 dst_if = NULL;
2133 else
2134 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2135 /* Tap any traffic not passing back out the originating interface */
2136 if (dst_if != ifp)
2137 ETHER_BPF_MTAP(bifp, m);
2138 if (dst_if == NULL) {
2139 struct bridge_iflist *bif;
2140 struct mbuf *mc;
2141 int used = 0;
2142
2143 bridge_span(sc, m);
2144
2145 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2146 dst_if = bif->bif_ifp;
2147
2148 if (dst_if->if_type == IFT_GIF)
2149 continue;
2150 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2151 continue;
2152
2153 /*
2154 * If this is not the original output interface,
2155 * and the interface is participating in spanning
2156 * tree, make sure the port is in a state that
2157 * allows forwarding.
2158 */
2159 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2160 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2161 continue;
2162
2163 if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2164 used = 1;
2165 mc = m;
2166 } else {
2167 mc = m_dup(m, M_NOWAIT);
2168 if (mc == NULL) {
2169 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2170 continue;
2171 }
2172 }
2173
2174 bridge_enqueue(sc, dst_if, mc);
2175 }
2176 if (used == 0)
2177 m_freem(m);
2178 return (0);
2179 }
2180
2181 sendunicast:
2182 /*
2183 * XXX Spanning tree consideration here?
2184 */
2185
2186 bridge_span(sc, m);
2187 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2188 m_freem(m);
2189 return (0);
2190 }
2191
2192 bridge_enqueue(sc, dst_if, m);
2193 return (0);
2194 }
2195
2196 /*
2197 * bridge_transmit:
2198 *
2199 * Do output on a bridge.
2200 *
2201 */
2202 static int
bridge_transmit(struct ifnet * ifp,struct mbuf * m)2203 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2204 {
2205 struct bridge_softc *sc;
2206 struct ether_header *eh;
2207 struct ifnet *dst_if;
2208 int error = 0;
2209
2210 sc = ifp->if_softc;
2211
2212 ETHER_BPF_MTAP(ifp, m);
2213
2214 eh = mtod(m, struct ether_header *);
2215
2216 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2217 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2218 error = bridge_enqueue(sc, dst_if, m);
2219 } else
2220 bridge_broadcast(sc, ifp, m, 0);
2221
2222 return (error);
2223 }
2224
2225 #ifdef ALTQ
2226 static void
bridge_altq_start(if_t ifp)2227 bridge_altq_start(if_t ifp)
2228 {
2229 struct ifaltq *ifq = &ifp->if_snd;
2230 struct mbuf *m;
2231
2232 IFQ_LOCK(ifq);
2233 IFQ_DEQUEUE_NOLOCK(ifq, m);
2234 while (m != NULL) {
2235 bridge_transmit(ifp, m);
2236 IFQ_DEQUEUE_NOLOCK(ifq, m);
2237 }
2238 IFQ_UNLOCK(ifq);
2239 }
2240
2241 static int
bridge_altq_transmit(if_t ifp,struct mbuf * m)2242 bridge_altq_transmit(if_t ifp, struct mbuf *m)
2243 {
2244 int err;
2245
2246 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
2247 IFQ_ENQUEUE(&ifp->if_snd, m, err);
2248 if (err == 0)
2249 bridge_altq_start(ifp);
2250 } else
2251 err = bridge_transmit(ifp, m);
2252
2253 return (err);
2254 }
2255 #endif /* ALTQ */
2256
2257 /*
2258 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2259 */
2260 static void
bridge_qflush(struct ifnet * ifp __unused)2261 bridge_qflush(struct ifnet *ifp __unused)
2262 {
2263 }
2264
2265 /*
2266 * bridge_forward:
2267 *
2268 * The forwarding function of the bridge.
2269 *
2270 * NOTE: Releases the lock on return.
2271 */
2272 static void
bridge_forward(struct bridge_softc * sc,struct bridge_iflist * sbif,struct mbuf * m)2273 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2274 struct mbuf *m)
2275 {
2276 struct bridge_iflist *dbif;
2277 struct ifnet *src_if, *dst_if, *ifp;
2278 struct ether_header *eh;
2279 uint16_t vlan;
2280 uint8_t *dst;
2281 int error;
2282
2283 NET_EPOCH_ASSERT();
2284
2285 src_if = m->m_pkthdr.rcvif;
2286 ifp = sc->sc_ifp;
2287
2288 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2289 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2290 vlan = VLANTAGOF(m);
2291
2292 if ((sbif->bif_flags & IFBIF_STP) &&
2293 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2294 goto drop;
2295
2296 eh = mtod(m, struct ether_header *);
2297 dst = eh->ether_dhost;
2298
2299 /* If the interface is learning, record the address. */
2300 if (sbif->bif_flags & IFBIF_LEARNING) {
2301 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2302 sbif, 0, IFBAF_DYNAMIC);
2303 /*
2304 * If the interface has addresses limits then deny any source
2305 * that is not in the cache.
2306 */
2307 if (error && sbif->bif_addrmax)
2308 goto drop;
2309 }
2310
2311 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2312 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2313 goto drop;
2314
2315 /*
2316 * At this point, the port either doesn't participate
2317 * in spanning tree or it is in the forwarding state.
2318 */
2319
2320 /*
2321 * If the packet is unicast, destined for someone on
2322 * "this" side of the bridge, drop it.
2323 */
2324 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2325 dst_if = bridge_rtlookup(sc, dst, vlan);
2326 if (src_if == dst_if)
2327 goto drop;
2328 } else {
2329 /*
2330 * Check if its a reserved multicast address, any address
2331 * listed in 802.1D section 7.12.6 may not be forwarded by the
2332 * bridge.
2333 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2334 */
2335 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2336 dst[2] == 0xc2 && dst[3] == 0x00 &&
2337 dst[4] == 0x00 && dst[5] <= 0x0f)
2338 goto drop;
2339
2340 /* ...forward it to all interfaces. */
2341 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2342 dst_if = NULL;
2343 }
2344
2345 /*
2346 * If we have a destination interface which is a member of our bridge,
2347 * OR this is a unicast packet, push it through the bpf(4) machinery.
2348 * For broadcast or multicast packets, don't bother because it will
2349 * be reinjected into ether_input. We do this before we pass the packets
2350 * through the pfil(9) framework, as it is possible that pfil(9) will
2351 * drop the packet, or possibly modify it, making it difficult to debug
2352 * firewall issues on the bridge.
2353 */
2354 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2355 ETHER_BPF_MTAP(ifp, m);
2356
2357 /* run the packet filter */
2358 if (PFIL_HOOKED_IN(V_inet_pfil_head)
2359 #ifdef INET6
2360 || PFIL_HOOKED_IN(V_inet6_pfil_head)
2361 #endif
2362 ) {
2363 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2364 return;
2365 if (m == NULL)
2366 return;
2367 }
2368
2369 if (dst_if == NULL) {
2370 bridge_broadcast(sc, src_if, m, 1);
2371 return;
2372 }
2373
2374 /*
2375 * At this point, we're dealing with a unicast frame
2376 * going to a different interface.
2377 */
2378 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2379 goto drop;
2380
2381 dbif = bridge_lookup_member_if(sc, dst_if);
2382 if (dbif == NULL)
2383 /* Not a member of the bridge (anymore?) */
2384 goto drop;
2385
2386 /* Private segments can not talk to each other */
2387 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2388 goto drop;
2389
2390 if ((dbif->bif_flags & IFBIF_STP) &&
2391 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2392 goto drop;
2393
2394 if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2395 #ifdef INET6
2396 || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2397 #endif
2398 ) {
2399 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2400 return;
2401 if (m == NULL)
2402 return;
2403 }
2404
2405 bridge_enqueue(sc, dst_if, m);
2406 return;
2407
2408 drop:
2409 m_freem(m);
2410 }
2411
2412 /*
2413 * bridge_input:
2414 *
2415 * Receive input from a member interface. Queue the packet for
2416 * bridging if it is not for us.
2417 */
2418 static struct mbuf *
bridge_input(struct ifnet * ifp,struct mbuf * m)2419 bridge_input(struct ifnet *ifp, struct mbuf *m)
2420 {
2421 struct bridge_softc *sc = ifp->if_bridge;
2422 struct bridge_iflist *bif, *bif2;
2423 struct ifnet *bifp;
2424 struct ether_header *eh;
2425 struct mbuf *mc, *mc2;
2426 uint16_t vlan;
2427 int error;
2428
2429 NET_EPOCH_ASSERT();
2430
2431 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2432 return (m);
2433
2434 bifp = sc->sc_ifp;
2435 vlan = VLANTAGOF(m);
2436
2437 /*
2438 * Implement support for bridge monitoring. If this flag has been
2439 * set on this interface, discard the packet once we push it through
2440 * the bpf(4) machinery, but before we do, increment the byte and
2441 * packet counters associated with this interface.
2442 */
2443 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2444 m->m_pkthdr.rcvif = bifp;
2445 ETHER_BPF_MTAP(bifp, m);
2446 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2447 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2448 m_freem(m);
2449 return (NULL);
2450 }
2451 bif = bridge_lookup_member_if(sc, ifp);
2452 if (bif == NULL) {
2453 return (m);
2454 }
2455
2456 eh = mtod(m, struct ether_header *);
2457
2458 bridge_span(sc, m);
2459
2460 if (m->m_flags & (M_BCAST|M_MCAST)) {
2461 /* Tap off 802.1D packets; they do not get forwarded. */
2462 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2463 ETHER_ADDR_LEN) == 0) {
2464 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2465 return (NULL);
2466 }
2467
2468 if ((bif->bif_flags & IFBIF_STP) &&
2469 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2470 return (m);
2471 }
2472
2473 /*
2474 * Make a deep copy of the packet and enqueue the copy
2475 * for bridge processing; return the original packet for
2476 * local processing.
2477 */
2478 mc = m_dup(m, M_NOWAIT);
2479 if (mc == NULL) {
2480 return (m);
2481 }
2482
2483 /* Perform the bridge forwarding function with the copy. */
2484 bridge_forward(sc, bif, mc);
2485
2486 /*
2487 * Reinject the mbuf as arriving on the bridge so we have a
2488 * chance at claiming multicast packets. We can not loop back
2489 * here from ether_input as a bridge is never a member of a
2490 * bridge.
2491 */
2492 KASSERT(bifp->if_bridge == NULL,
2493 ("loop created in bridge_input"));
2494 mc2 = m_dup(m, M_NOWAIT);
2495 if (mc2 != NULL) {
2496 /* Keep the layer3 header aligned */
2497 int i = min(mc2->m_pkthdr.len, max_protohdr);
2498 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2499 }
2500 if (mc2 != NULL) {
2501 mc2->m_pkthdr.rcvif = bifp;
2502 (*bifp->if_input)(bifp, mc2);
2503 }
2504
2505 /* Return the original packet for local processing. */
2506 return (m);
2507 }
2508
2509 if ((bif->bif_flags & IFBIF_STP) &&
2510 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2511 return (m);
2512 }
2513
2514 #if (defined(INET) || defined(INET6))
2515 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2516 || ((iface)->if_carp \
2517 && (*carp_forus_p)((iface), eh->ether_dhost))
2518 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2519 || ((iface)->if_carp \
2520 && (*carp_forus_p)((iface), eh->ether_shost))
2521 #else
2522 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2523 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2524 #endif
2525
2526 #ifdef INET6
2527 # define OR_PFIL_HOOKED_INET6 \
2528 || PFIL_HOOKED_IN(V_inet6_pfil_head)
2529 #else
2530 # define OR_PFIL_HOOKED_INET6
2531 #endif
2532
2533 #define GRAB_OUR_PACKETS(iface) \
2534 if ((iface)->if_type == IFT_GIF) \
2535 continue; \
2536 /* It is destined for us. */ \
2537 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2538 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2539 ) { \
2540 if (bif->bif_flags & IFBIF_LEARNING) { \
2541 error = bridge_rtupdate(sc, eh->ether_shost, \
2542 vlan, bif, 0, IFBAF_DYNAMIC); \
2543 if (error && bif->bif_addrmax) { \
2544 m_freem(m); \
2545 return (NULL); \
2546 } \
2547 } \
2548 m->m_pkthdr.rcvif = iface; \
2549 if ((iface) == ifp) { \
2550 /* Skip bridge processing... src == dest */ \
2551 return (m); \
2552 } \
2553 /* It's passing over or to the bridge, locally. */ \
2554 ETHER_BPF_MTAP(bifp, m); \
2555 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \
2556 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2557 /* Filter on the physical interface. */ \
2558 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2559 OR_PFIL_HOOKED_INET6)) { \
2560 if (bridge_pfil(&m, NULL, ifp, \
2561 PFIL_IN) != 0 || m == NULL) { \
2562 return (NULL); \
2563 } \
2564 } \
2565 if ((iface) != bifp) \
2566 ETHER_BPF_MTAP(iface, m); \
2567 return (m); \
2568 } \
2569 \
2570 /* We just received a packet that we sent out. */ \
2571 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2572 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2573 ) { \
2574 m_freem(m); \
2575 return (NULL); \
2576 }
2577
2578 /*
2579 * Unicast. Make sure it's not for the bridge.
2580 */
2581 do { GRAB_OUR_PACKETS(bifp) } while (0);
2582
2583 /*
2584 * Give a chance for ifp at first priority. This will help when the
2585 * packet comes through the interface like VLAN's with the same MACs
2586 * on several interfaces from the same bridge. This also will save
2587 * some CPU cycles in case the destination interface and the input
2588 * interface (eq ifp) are the same.
2589 */
2590 do { GRAB_OUR_PACKETS(ifp) } while (0);
2591
2592 /* Now check the all bridge members. */
2593 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2594 GRAB_OUR_PACKETS(bif2->bif_ifp)
2595 }
2596
2597 #undef OR_CARP_CHECK_WE_ARE_DST
2598 #undef OR_CARP_CHECK_WE_ARE_SRC
2599 #undef OR_PFIL_HOOKED_INET6
2600 #undef GRAB_OUR_PACKETS
2601
2602 /* Perform the bridge forwarding function. */
2603 bridge_forward(sc, bif, m);
2604
2605 return (NULL);
2606 }
2607
2608 /*
2609 * bridge_broadcast:
2610 *
2611 * Send a frame to all interfaces that are members of
2612 * the bridge, except for the one on which the packet
2613 * arrived.
2614 *
2615 * NOTE: Releases the lock on return.
2616 */
2617 static void
bridge_broadcast(struct bridge_softc * sc,struct ifnet * src_if,struct mbuf * m,int runfilt)2618 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2619 struct mbuf *m, int runfilt)
2620 {
2621 struct bridge_iflist *dbif, *sbif;
2622 struct mbuf *mc;
2623 struct ifnet *dst_if;
2624 int used = 0, i;
2625
2626 NET_EPOCH_ASSERT();
2627
2628 sbif = bridge_lookup_member_if(sc, src_if);
2629
2630 /* Filter on the bridge interface before broadcasting */
2631 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2632 #ifdef INET6
2633 || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2634 #endif
2635 )) {
2636 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2637 return;
2638 if (m == NULL)
2639 return;
2640 }
2641
2642 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2643 dst_if = dbif->bif_ifp;
2644 if (dst_if == src_if)
2645 continue;
2646
2647 /* Private segments can not talk to each other */
2648 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2649 continue;
2650
2651 if ((dbif->bif_flags & IFBIF_STP) &&
2652 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2653 continue;
2654
2655 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2656 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2657 continue;
2658
2659 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2660 continue;
2661
2662 if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
2663 mc = m;
2664 used = 1;
2665 } else {
2666 mc = m_dup(m, M_NOWAIT);
2667 if (mc == NULL) {
2668 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2669 continue;
2670 }
2671 }
2672
2673 /*
2674 * Filter on the output interface. Pass a NULL bridge interface
2675 * pointer so we do not redundantly filter on the bridge for
2676 * each interface we broadcast on.
2677 */
2678 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2679 #ifdef INET6
2680 || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2681 #endif
2682 )) {
2683 if (used == 0) {
2684 /* Keep the layer3 header aligned */
2685 i = min(mc->m_pkthdr.len, max_protohdr);
2686 mc = m_copyup(mc, i, ETHER_ALIGN);
2687 if (mc == NULL) {
2688 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2689 continue;
2690 }
2691 }
2692 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2693 continue;
2694 if (mc == NULL)
2695 continue;
2696 }
2697
2698 bridge_enqueue(sc, dst_if, mc);
2699 }
2700 if (used == 0)
2701 m_freem(m);
2702 }
2703
2704 /*
2705 * bridge_span:
2706 *
2707 * Duplicate a packet out one or more interfaces that are in span mode,
2708 * the original mbuf is unmodified.
2709 */
2710 static void
bridge_span(struct bridge_softc * sc,struct mbuf * m)2711 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2712 {
2713 struct bridge_iflist *bif;
2714 struct ifnet *dst_if;
2715 struct mbuf *mc;
2716
2717 NET_EPOCH_ASSERT();
2718
2719 if (CK_LIST_EMPTY(&sc->sc_spanlist))
2720 return;
2721
2722 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2723 dst_if = bif->bif_ifp;
2724
2725 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2726 continue;
2727
2728 mc = m_dup(m, M_NOWAIT);
2729 if (mc == NULL) {
2730 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2731 continue;
2732 }
2733
2734 bridge_enqueue(sc, dst_if, mc);
2735 }
2736 }
2737
2738 /*
2739 * bridge_rtupdate:
2740 *
2741 * Add a bridge routing entry.
2742 */
2743 static int
bridge_rtupdate(struct bridge_softc * sc,const uint8_t * dst,uint16_t vlan,struct bridge_iflist * bif,int setflags,uint8_t flags)2744 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2745 struct bridge_iflist *bif, int setflags, uint8_t flags)
2746 {
2747 struct bridge_rtnode *brt;
2748 int error;
2749
2750 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
2751
2752 /* Check the source address is valid and not multicast. */
2753 if (ETHER_IS_MULTICAST(dst) ||
2754 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2755 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2756 return (EINVAL);
2757
2758 /* 802.1p frames map to vlan 1 */
2759 if (vlan == 0)
2760 vlan = 1;
2761
2762 /*
2763 * A route for this destination might already exist. If so,
2764 * update it, otherwise create a new one.
2765 */
2766 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2767 BRIDGE_RT_LOCK(sc);
2768
2769 /* Check again, now that we have the lock. There could have
2770 * been a race and we only want to insert this once. */
2771 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) {
2772 BRIDGE_RT_UNLOCK(sc);
2773 return (0);
2774 }
2775
2776 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2777 sc->sc_brtexceeded++;
2778 BRIDGE_RT_UNLOCK(sc);
2779 return (ENOSPC);
2780 }
2781 /* Check per interface address limits (if enabled) */
2782 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2783 bif->bif_addrexceeded++;
2784 BRIDGE_RT_UNLOCK(sc);
2785 return (ENOSPC);
2786 }
2787
2788 /*
2789 * Allocate a new bridge forwarding node, and
2790 * initialize the expiration time and Ethernet
2791 * address.
2792 */
2793 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2794 if (brt == NULL) {
2795 BRIDGE_RT_UNLOCK(sc);
2796 return (ENOMEM);
2797 }
2798 brt->brt_vnet = curvnet;
2799
2800 if (bif->bif_flags & IFBIF_STICKY)
2801 brt->brt_flags = IFBAF_STICKY;
2802 else
2803 brt->brt_flags = IFBAF_DYNAMIC;
2804
2805 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2806 brt->brt_vlan = vlan;
2807
2808 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2809 uma_zfree(V_bridge_rtnode_zone, brt);
2810 BRIDGE_RT_UNLOCK(sc);
2811 return (error);
2812 }
2813 brt->brt_dst = bif;
2814 bif->bif_addrcnt++;
2815
2816 BRIDGE_RT_UNLOCK(sc);
2817 }
2818
2819 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2820 brt->brt_dst != bif) {
2821 BRIDGE_RT_LOCK(sc);
2822 brt->brt_dst->bif_addrcnt--;
2823 brt->brt_dst = bif;
2824 brt->brt_dst->bif_addrcnt++;
2825 BRIDGE_RT_UNLOCK(sc);
2826 }
2827
2828 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2829 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2830 if (setflags)
2831 brt->brt_flags = flags;
2832
2833 return (0);
2834 }
2835
2836 /*
2837 * bridge_rtlookup:
2838 *
2839 * Lookup the destination interface for an address.
2840 */
2841 static struct ifnet *
bridge_rtlookup(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)2842 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2843 {
2844 struct bridge_rtnode *brt;
2845
2846 NET_EPOCH_ASSERT();
2847
2848 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2849 return (NULL);
2850
2851 return (brt->brt_ifp);
2852 }
2853
2854 /*
2855 * bridge_rttrim:
2856 *
2857 * Trim the routine table so that we have a number
2858 * of routing entries less than or equal to the
2859 * maximum number.
2860 */
2861 static void
bridge_rttrim(struct bridge_softc * sc)2862 bridge_rttrim(struct bridge_softc *sc)
2863 {
2864 struct bridge_rtnode *brt, *nbrt;
2865
2866 NET_EPOCH_ASSERT();
2867 BRIDGE_RT_LOCK_ASSERT(sc);
2868
2869 /* Make sure we actually need to do this. */
2870 if (sc->sc_brtcnt <= sc->sc_brtmax)
2871 return;
2872
2873 /* Force an aging cycle; this might trim enough addresses. */
2874 bridge_rtage(sc);
2875 if (sc->sc_brtcnt <= sc->sc_brtmax)
2876 return;
2877
2878 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2879 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2880 bridge_rtnode_destroy(sc, brt);
2881 if (sc->sc_brtcnt <= sc->sc_brtmax)
2882 return;
2883 }
2884 }
2885 }
2886
2887 /*
2888 * bridge_timer:
2889 *
2890 * Aging timer for the bridge.
2891 */
2892 static void
bridge_timer(void * arg)2893 bridge_timer(void *arg)
2894 {
2895 struct bridge_softc *sc = arg;
2896
2897 BRIDGE_RT_LOCK_ASSERT(sc);
2898
2899 /* Destruction of rtnodes requires a proper vnet context */
2900 CURVNET_SET(sc->sc_ifp->if_vnet);
2901 bridge_rtage(sc);
2902
2903 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2904 callout_reset(&sc->sc_brcallout,
2905 bridge_rtable_prune_period * hz, bridge_timer, sc);
2906 CURVNET_RESTORE();
2907 }
2908
2909 /*
2910 * bridge_rtage:
2911 *
2912 * Perform an aging cycle.
2913 */
2914 static void
bridge_rtage(struct bridge_softc * sc)2915 bridge_rtage(struct bridge_softc *sc)
2916 {
2917 struct bridge_rtnode *brt, *nbrt;
2918
2919 BRIDGE_RT_LOCK_ASSERT(sc);
2920
2921 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2922 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2923 if (time_uptime >= brt->brt_expire)
2924 bridge_rtnode_destroy(sc, brt);
2925 }
2926 }
2927 }
2928
2929 /*
2930 * bridge_rtflush:
2931 *
2932 * Remove all dynamic addresses from the bridge.
2933 */
2934 static void
bridge_rtflush(struct bridge_softc * sc,int full)2935 bridge_rtflush(struct bridge_softc *sc, int full)
2936 {
2937 struct bridge_rtnode *brt, *nbrt;
2938
2939 BRIDGE_RT_LOCK_ASSERT(sc);
2940
2941 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2942 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2943 bridge_rtnode_destroy(sc, brt);
2944 }
2945 }
2946
2947 /*
2948 * bridge_rtdaddr:
2949 *
2950 * Remove an address from the table.
2951 */
2952 static int
bridge_rtdaddr(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)2953 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2954 {
2955 struct bridge_rtnode *brt;
2956 int found = 0;
2957
2958 BRIDGE_RT_LOCK(sc);
2959
2960 /*
2961 * If vlan is zero then we want to delete for all vlans so the lookup
2962 * may return more than one.
2963 */
2964 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2965 bridge_rtnode_destroy(sc, brt);
2966 found = 1;
2967 }
2968
2969 BRIDGE_RT_UNLOCK(sc);
2970
2971 return (found ? 0 : ENOENT);
2972 }
2973
2974 /*
2975 * bridge_rtdelete:
2976 *
2977 * Delete routes to a speicifc member interface.
2978 */
2979 static void
bridge_rtdelete(struct bridge_softc * sc,struct ifnet * ifp,int full)2980 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2981 {
2982 struct bridge_rtnode *brt, *nbrt;
2983
2984 BRIDGE_RT_LOCK_ASSERT(sc);
2985
2986 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2987 if (brt->brt_ifp == ifp && (full ||
2988 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2989 bridge_rtnode_destroy(sc, brt);
2990 }
2991 }
2992
2993 /*
2994 * bridge_rtable_init:
2995 *
2996 * Initialize the route table for this bridge.
2997 */
2998 static void
bridge_rtable_init(struct bridge_softc * sc)2999 bridge_rtable_init(struct bridge_softc *sc)
3000 {
3001 int i;
3002
3003 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
3004 M_DEVBUF, M_WAITOK);
3005
3006 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3007 CK_LIST_INIT(&sc->sc_rthash[i]);
3008
3009 sc->sc_rthash_key = arc4random();
3010 CK_LIST_INIT(&sc->sc_rtlist);
3011 }
3012
3013 /*
3014 * bridge_rtable_fini:
3015 *
3016 * Deconstruct the route table for this bridge.
3017 */
3018 static void
bridge_rtable_fini(struct bridge_softc * sc)3019 bridge_rtable_fini(struct bridge_softc *sc)
3020 {
3021
3022 KASSERT(sc->sc_brtcnt == 0,
3023 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
3024 free(sc->sc_rthash, M_DEVBUF);
3025 }
3026
3027 /*
3028 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3029 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3030 */
3031 #define mix(a, b, c) \
3032 do { \
3033 a -= b; a -= c; a ^= (c >> 13); \
3034 b -= c; b -= a; b ^= (a << 8); \
3035 c -= a; c -= b; c ^= (b >> 13); \
3036 a -= b; a -= c; a ^= (c >> 12); \
3037 b -= c; b -= a; b ^= (a << 16); \
3038 c -= a; c -= b; c ^= (b >> 5); \
3039 a -= b; a -= c; a ^= (c >> 3); \
3040 b -= c; b -= a; b ^= (a << 10); \
3041 c -= a; c -= b; c ^= (b >> 15); \
3042 } while (/*CONSTCOND*/0)
3043
3044 static __inline uint32_t
bridge_rthash(struct bridge_softc * sc,const uint8_t * addr)3045 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3046 {
3047 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3048
3049 b += addr[5] << 8;
3050 b += addr[4];
3051 a += addr[3] << 24;
3052 a += addr[2] << 16;
3053 a += addr[1] << 8;
3054 a += addr[0];
3055
3056 mix(a, b, c);
3057
3058 return (c & BRIDGE_RTHASH_MASK);
3059 }
3060
3061 #undef mix
3062
3063 static int
bridge_rtnode_addr_cmp(const uint8_t * a,const uint8_t * b)3064 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3065 {
3066 int i, d;
3067
3068 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3069 d = ((int)a[i]) - ((int)b[i]);
3070 }
3071
3072 return (d);
3073 }
3074
3075 /*
3076 * bridge_rtnode_lookup:
3077 *
3078 * Look up a bridge route node for the specified destination. Compare the
3079 * vlan id or if zero then just return the first match.
3080 */
3081 static struct bridge_rtnode *
bridge_rtnode_lookup(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)3082 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3083 {
3084 struct bridge_rtnode *brt;
3085 uint32_t hash;
3086 int dir;
3087
3088 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc);
3089
3090 hash = bridge_rthash(sc, addr);
3091 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3092 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3093 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
3094 return (brt);
3095 if (dir > 0)
3096 return (NULL);
3097 }
3098
3099 return (NULL);
3100 }
3101
3102 /*
3103 * bridge_rtnode_insert:
3104 *
3105 * Insert the specified bridge node into the route table. We
3106 * assume the entry is not already in the table.
3107 */
3108 static int
bridge_rtnode_insert(struct bridge_softc * sc,struct bridge_rtnode * brt)3109 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3110 {
3111 struct bridge_rtnode *lbrt;
3112 uint32_t hash;
3113 int dir;
3114
3115 BRIDGE_RT_LOCK_ASSERT(sc);
3116
3117 hash = bridge_rthash(sc, brt->brt_addr);
3118
3119 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3120 if (lbrt == NULL) {
3121 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3122 goto out;
3123 }
3124
3125 do {
3126 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3127 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3128 return (EEXIST);
3129 if (dir > 0) {
3130 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3131 goto out;
3132 }
3133 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3134 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3135 goto out;
3136 }
3137 lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3138 } while (lbrt != NULL);
3139
3140 #ifdef DIAGNOSTIC
3141 panic("bridge_rtnode_insert: impossible");
3142 #endif
3143
3144 out:
3145 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3146 sc->sc_brtcnt++;
3147
3148 return (0);
3149 }
3150
3151 static void
bridge_rtnode_destroy_cb(struct epoch_context * ctx)3152 bridge_rtnode_destroy_cb(struct epoch_context *ctx)
3153 {
3154 struct bridge_rtnode *brt;
3155
3156 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx);
3157
3158 CURVNET_SET(brt->brt_vnet);
3159 uma_zfree(V_bridge_rtnode_zone, brt);
3160 CURVNET_RESTORE();
3161 }
3162
3163 /*
3164 * bridge_rtnode_destroy:
3165 *
3166 * Destroy a bridge rtnode.
3167 */
3168 static void
bridge_rtnode_destroy(struct bridge_softc * sc,struct bridge_rtnode * brt)3169 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3170 {
3171 BRIDGE_RT_LOCK_ASSERT(sc);
3172
3173 CK_LIST_REMOVE(brt, brt_hash);
3174
3175 CK_LIST_REMOVE(brt, brt_list);
3176 sc->sc_brtcnt--;
3177 brt->brt_dst->bif_addrcnt--;
3178
3179 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx);
3180 }
3181
3182 /*
3183 * bridge_rtable_expire:
3184 *
3185 * Set the expiry time for all routes on an interface.
3186 */
3187 static void
bridge_rtable_expire(struct ifnet * ifp,int age)3188 bridge_rtable_expire(struct ifnet *ifp, int age)
3189 {
3190 struct bridge_softc *sc = ifp->if_bridge;
3191 struct bridge_rtnode *brt;
3192
3193 CURVNET_SET(ifp->if_vnet);
3194 BRIDGE_RT_LOCK(sc);
3195
3196 /*
3197 * If the age is zero then flush, otherwise set all the expiry times to
3198 * age for the interface
3199 */
3200 if (age == 0)
3201 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3202 else {
3203 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3204 /* Cap the expiry time to 'age' */
3205 if (brt->brt_ifp == ifp &&
3206 brt->brt_expire > time_uptime + age &&
3207 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3208 brt->brt_expire = time_uptime + age;
3209 }
3210 }
3211 BRIDGE_RT_UNLOCK(sc);
3212 CURVNET_RESTORE();
3213 }
3214
3215 /*
3216 * bridge_state_change:
3217 *
3218 * Callback from the bridgestp code when a port changes states.
3219 */
3220 static void
bridge_state_change(struct ifnet * ifp,int state)3221 bridge_state_change(struct ifnet *ifp, int state)
3222 {
3223 struct bridge_softc *sc = ifp->if_bridge;
3224 static const char *stpstates[] = {
3225 "disabled",
3226 "listening",
3227 "learning",
3228 "forwarding",
3229 "blocking",
3230 "discarding"
3231 };
3232
3233 CURVNET_SET(ifp->if_vnet);
3234 if (V_log_stp)
3235 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3236 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3237 CURVNET_RESTORE();
3238 }
3239
3240 /*
3241 * Send bridge packets through pfil if they are one of the types pfil can deal
3242 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3243 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3244 * that interface.
3245 */
3246 static int
bridge_pfil(struct mbuf ** mp,struct ifnet * bifp,struct ifnet * ifp,int dir)3247 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3248 {
3249 int snap, error, i, hlen;
3250 struct ether_header *eh1, eh2;
3251 struct ip *ip;
3252 struct llc llc1;
3253 u_int16_t ether_type;
3254 pfil_return_t rv;
3255
3256 snap = 0;
3257 error = -1; /* Default error if not error == 0 */
3258
3259 #if 0
3260 /* we may return with the IP fields swapped, ensure its not shared */
3261 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3262 #endif
3263
3264 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3265 return (0); /* filtering is disabled */
3266
3267 i = min((*mp)->m_pkthdr.len, max_protohdr);
3268 if ((*mp)->m_len < i) {
3269 *mp = m_pullup(*mp, i);
3270 if (*mp == NULL) {
3271 printf("%s: m_pullup failed\n", __func__);
3272 return (-1);
3273 }
3274 }
3275
3276 eh1 = mtod(*mp, struct ether_header *);
3277 ether_type = ntohs(eh1->ether_type);
3278
3279 /*
3280 * Check for SNAP/LLC.
3281 */
3282 if (ether_type < ETHERMTU) {
3283 struct llc *llc2 = (struct llc *)(eh1 + 1);
3284
3285 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3286 llc2->llc_dsap == LLC_SNAP_LSAP &&
3287 llc2->llc_ssap == LLC_SNAP_LSAP &&
3288 llc2->llc_control == LLC_UI) {
3289 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3290 snap = 1;
3291 }
3292 }
3293
3294 /*
3295 * If we're trying to filter bridge traffic, don't look at anything
3296 * other than IP and ARP traffic. If the filter doesn't understand
3297 * IPv6, don't allow IPv6 through the bridge either. This is lame
3298 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3299 * but of course we don't have an AppleTalk filter to begin with.
3300 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3301 * ARP traffic.)
3302 */
3303 switch (ether_type) {
3304 case ETHERTYPE_ARP:
3305 case ETHERTYPE_REVARP:
3306 if (V_pfil_ipfw_arp == 0)
3307 return (0); /* Automatically pass */
3308 break;
3309
3310 case ETHERTYPE_IP:
3311 #ifdef INET6
3312 case ETHERTYPE_IPV6:
3313 #endif /* INET6 */
3314 break;
3315 default:
3316 /*
3317 * Check to see if the user wants to pass non-ip
3318 * packets, these will not be checked by pfil(9) and
3319 * passed unconditionally so the default is to drop.
3320 */
3321 if (V_pfil_onlyip)
3322 goto bad;
3323 }
3324
3325 /* Run the packet through pfil before stripping link headers */
3326 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3327 dir == PFIL_OUT && ifp != NULL) {
3328 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3329 case PFIL_DROPPED:
3330 return (EACCES);
3331 case PFIL_CONSUMED:
3332 return (0);
3333 }
3334 }
3335
3336 /* Strip off the Ethernet header and keep a copy. */
3337 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3338 m_adj(*mp, ETHER_HDR_LEN);
3339
3340 /* Strip off snap header, if present */
3341 if (snap) {
3342 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3343 m_adj(*mp, sizeof(struct llc));
3344 }
3345
3346 /*
3347 * Check the IP header for alignment and errors
3348 */
3349 if (dir == PFIL_IN) {
3350 switch (ether_type) {
3351 case ETHERTYPE_IP:
3352 error = bridge_ip_checkbasic(mp);
3353 break;
3354 #ifdef INET6
3355 case ETHERTYPE_IPV6:
3356 error = bridge_ip6_checkbasic(mp);
3357 break;
3358 #endif /* INET6 */
3359 default:
3360 error = 0;
3361 }
3362 if (error)
3363 goto bad;
3364 }
3365
3366 error = 0;
3367
3368 /*
3369 * Run the packet through pfil
3370 */
3371 rv = PFIL_PASS;
3372 switch (ether_type) {
3373 case ETHERTYPE_IP:
3374 /*
3375 * Run pfil on the member interface and the bridge, both can
3376 * be skipped by clearing pfil_member or pfil_bridge.
3377 *
3378 * Keep the order:
3379 * in_if -> bridge_if -> out_if
3380 */
3381 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3382 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3383 PFIL_PASS)
3384 break;
3385
3386 if (V_pfil_member && ifp != NULL && (rv =
3387 pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3388 PFIL_PASS)
3389 break;
3390
3391 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3392 pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3393 PFIL_PASS)
3394 break;
3395
3396 /* check if we need to fragment the packet */
3397 /* bridge_fragment generates a mbuf chain of packets */
3398 /* that already include eth headers */
3399 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3400 i = (*mp)->m_pkthdr.len;
3401 if (i > ifp->if_mtu) {
3402 error = bridge_fragment(ifp, mp, &eh2, snap,
3403 &llc1);
3404 return (error);
3405 }
3406 }
3407
3408 /* Recalculate the ip checksum. */
3409 ip = mtod(*mp, struct ip *);
3410 hlen = ip->ip_hl << 2;
3411 if (hlen < sizeof(struct ip))
3412 goto bad;
3413 if (hlen > (*mp)->m_len) {
3414 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3415 goto bad;
3416 ip = mtod(*mp, struct ip *);
3417 if (ip == NULL)
3418 goto bad;
3419 }
3420 ip->ip_sum = 0;
3421 if (hlen == sizeof(struct ip))
3422 ip->ip_sum = in_cksum_hdr(ip);
3423 else
3424 ip->ip_sum = in_cksum(*mp, hlen);
3425
3426 break;
3427 #ifdef INET6
3428 case ETHERTYPE_IPV6:
3429 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3430 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3431 PFIL_PASS)
3432 break;
3433
3434 if (V_pfil_member && ifp != NULL && (rv =
3435 pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3436 PFIL_PASS)
3437 break;
3438
3439 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3440 pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3441 PFIL_PASS)
3442 break;
3443 break;
3444 #endif
3445 }
3446
3447 switch (rv) {
3448 case PFIL_CONSUMED:
3449 return (0);
3450 case PFIL_DROPPED:
3451 return (EACCES);
3452 default:
3453 break;
3454 }
3455
3456 error = -1;
3457
3458 /*
3459 * Finally, put everything back the way it was and return
3460 */
3461 if (snap) {
3462 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3463 if (*mp == NULL)
3464 return (error);
3465 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3466 }
3467
3468 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3469 if (*mp == NULL)
3470 return (error);
3471 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3472
3473 return (0);
3474
3475 bad:
3476 m_freem(*mp);
3477 *mp = NULL;
3478 return (error);
3479 }
3480
3481 /*
3482 * Perform basic checks on header size since
3483 * pfil assumes ip_input has already processed
3484 * it for it. Cut-and-pasted from ip_input.c.
3485 * Given how simple the IPv6 version is,
3486 * does the IPv4 version really need to be
3487 * this complicated?
3488 *
3489 * XXX Should we update ipstat here, or not?
3490 * XXX Right now we update ipstat but not
3491 * XXX csum_counter.
3492 */
3493 static int
bridge_ip_checkbasic(struct mbuf ** mp)3494 bridge_ip_checkbasic(struct mbuf **mp)
3495 {
3496 struct mbuf *m = *mp;
3497 struct ip *ip;
3498 int len, hlen;
3499 u_short sum;
3500
3501 if (*mp == NULL)
3502 return (-1);
3503
3504 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3505 if ((m = m_copyup(m, sizeof(struct ip),
3506 (max_linkhdr + 3) & ~3)) == NULL) {
3507 /* XXXJRT new stat, please */
3508 KMOD_IPSTAT_INC(ips_toosmall);
3509 goto bad;
3510 }
3511 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3512 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3513 KMOD_IPSTAT_INC(ips_toosmall);
3514 goto bad;
3515 }
3516 }
3517 ip = mtod(m, struct ip *);
3518 if (ip == NULL) goto bad;
3519
3520 if (ip->ip_v != IPVERSION) {
3521 KMOD_IPSTAT_INC(ips_badvers);
3522 goto bad;
3523 }
3524 hlen = ip->ip_hl << 2;
3525 if (hlen < sizeof(struct ip)) { /* minimum header length */
3526 KMOD_IPSTAT_INC(ips_badhlen);
3527 goto bad;
3528 }
3529 if (hlen > m->m_len) {
3530 if ((m = m_pullup(m, hlen)) == NULL) {
3531 KMOD_IPSTAT_INC(ips_badhlen);
3532 goto bad;
3533 }
3534 ip = mtod(m, struct ip *);
3535 if (ip == NULL) goto bad;
3536 }
3537
3538 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3539 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3540 } else {
3541 if (hlen == sizeof(struct ip)) {
3542 sum = in_cksum_hdr(ip);
3543 } else {
3544 sum = in_cksum(m, hlen);
3545 }
3546 }
3547 if (sum) {
3548 KMOD_IPSTAT_INC(ips_badsum);
3549 goto bad;
3550 }
3551
3552 /* Retrieve the packet length. */
3553 len = ntohs(ip->ip_len);
3554
3555 /*
3556 * Check for additional length bogosity
3557 */
3558 if (len < hlen) {
3559 KMOD_IPSTAT_INC(ips_badlen);
3560 goto bad;
3561 }
3562
3563 /*
3564 * Check that the amount of data in the buffers
3565 * is as at least much as the IP header would have us expect.
3566 * Drop packet if shorter than we expect.
3567 */
3568 if (m->m_pkthdr.len < len) {
3569 KMOD_IPSTAT_INC(ips_tooshort);
3570 goto bad;
3571 }
3572
3573 /* Checks out, proceed */
3574 *mp = m;
3575 return (0);
3576
3577 bad:
3578 *mp = m;
3579 return (-1);
3580 }
3581
3582 #ifdef INET6
3583 /*
3584 * Same as above, but for IPv6.
3585 * Cut-and-pasted from ip6_input.c.
3586 * XXX Should we update ip6stat, or not?
3587 */
3588 static int
bridge_ip6_checkbasic(struct mbuf ** mp)3589 bridge_ip6_checkbasic(struct mbuf **mp)
3590 {
3591 struct mbuf *m = *mp;
3592 struct ip6_hdr *ip6;
3593
3594 /*
3595 * If the IPv6 header is not aligned, slurp it up into a new
3596 * mbuf with space for link headers, in the event we forward
3597 * it. Otherwise, if it is aligned, make sure the entire base
3598 * IPv6 header is in the first mbuf of the chain.
3599 */
3600 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3601 struct ifnet *inifp = m->m_pkthdr.rcvif;
3602 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3603 (max_linkhdr + 3) & ~3)) == NULL) {
3604 /* XXXJRT new stat, please */
3605 IP6STAT_INC(ip6s_toosmall);
3606 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3607 goto bad;
3608 }
3609 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3610 struct ifnet *inifp = m->m_pkthdr.rcvif;
3611 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3612 IP6STAT_INC(ip6s_toosmall);
3613 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3614 goto bad;
3615 }
3616 }
3617
3618 ip6 = mtod(m, struct ip6_hdr *);
3619
3620 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3621 IP6STAT_INC(ip6s_badvers);
3622 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3623 goto bad;
3624 }
3625
3626 /* Checks out, proceed */
3627 *mp = m;
3628 return (0);
3629
3630 bad:
3631 *mp = m;
3632 return (-1);
3633 }
3634 #endif /* INET6 */
3635
3636 /*
3637 * bridge_fragment:
3638 *
3639 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3640 */
3641 static int
bridge_fragment(struct ifnet * ifp,struct mbuf ** mp,struct ether_header * eh,int snap,struct llc * llc)3642 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3643 int snap, struct llc *llc)
3644 {
3645 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3646 struct ip *ip;
3647 int error = -1;
3648
3649 if (m->m_len < sizeof(struct ip) &&
3650 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3651 goto dropit;
3652 ip = mtod(m, struct ip *);
3653
3654 m->m_pkthdr.csum_flags |= CSUM_IP;
3655 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3656 if (error)
3657 goto dropit;
3658
3659 /*
3660 * Walk the chain and re-add the Ethernet header for
3661 * each mbuf packet.
3662 */
3663 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3664 nextpkt = mcur->m_nextpkt;
3665 mcur->m_nextpkt = NULL;
3666 if (snap) {
3667 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3668 if (mcur == NULL) {
3669 error = ENOBUFS;
3670 if (mprev != NULL)
3671 mprev->m_nextpkt = nextpkt;
3672 goto dropit;
3673 }
3674 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3675 }
3676
3677 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3678 if (mcur == NULL) {
3679 error = ENOBUFS;
3680 if (mprev != NULL)
3681 mprev->m_nextpkt = nextpkt;
3682 goto dropit;
3683 }
3684 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3685
3686 /*
3687 * The previous two M_PREPEND could have inserted one or two
3688 * mbufs in front so we have to update the previous packet's
3689 * m_nextpkt.
3690 */
3691 mcur->m_nextpkt = nextpkt;
3692 if (mprev != NULL)
3693 mprev->m_nextpkt = mcur;
3694 else {
3695 /* The first mbuf in the original chain needs to be
3696 * updated. */
3697 *mp = mcur;
3698 }
3699 mprev = mcur;
3700 }
3701
3702 KMOD_IPSTAT_INC(ips_fragmented);
3703 return (error);
3704
3705 dropit:
3706 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3707 m = mcur->m_nextpkt;
3708 m_freem(mcur);
3709 }
3710 return (error);
3711 }
3712
3713 static void
bridge_linkstate(struct ifnet * ifp)3714 bridge_linkstate(struct ifnet *ifp)
3715 {
3716 struct bridge_softc *sc = ifp->if_bridge;
3717 struct bridge_iflist *bif;
3718 struct epoch_tracker et;
3719
3720 NET_EPOCH_ENTER(et);
3721
3722 bif = bridge_lookup_member_if(sc, ifp);
3723 if (bif == NULL) {
3724 NET_EPOCH_EXIT(et);
3725 return;
3726 }
3727 bridge_linkcheck(sc);
3728
3729 bstp_linkstate(&bif->bif_stp);
3730
3731 NET_EPOCH_EXIT(et);
3732 }
3733
3734 static void
bridge_linkcheck(struct bridge_softc * sc)3735 bridge_linkcheck(struct bridge_softc *sc)
3736 {
3737 struct bridge_iflist *bif;
3738 int new_link, hasls;
3739
3740 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
3741
3742 new_link = LINK_STATE_DOWN;
3743 hasls = 0;
3744 /* Our link is considered up if at least one of our ports is active */
3745 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3746 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3747 hasls++;
3748 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3749 new_link = LINK_STATE_UP;
3750 break;
3751 }
3752 }
3753 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3754 /* If no interfaces support link-state then we default to up */
3755 new_link = LINK_STATE_UP;
3756 }
3757 if_link_state_change(sc->sc_ifp, new_link);
3758 }
3759