1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright 2001 Wasabi Systems, Inc.
7 * All rights reserved.
8 *
9 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed for the NetBSD Project by
22 * Wasabi Systems, Inc.
23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
24 * or promote products derived from this software without specific prior
25 * written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 /*
41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
42 * All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
63 * POSSIBILITY OF SUCH DAMAGE.
64 *
65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
66 */
67
68 /*
69 * Network interface bridge support.
70 *
71 * TODO:
72 *
73 * - Currently only supports Ethernet-like interfaces (Ethernet,
74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
75 * to bridge other types of interfaces (maybe consider
76 * heterogeneous bridges).
77 */
78
79 #include <sys/cdefs.h>
80 #include "opt_inet.h"
81 #include "opt_inet6.h"
82
83 #include <sys/param.h>
84 #include <sys/eventhandler.h>
85 #include <sys/mbuf.h>
86 #include <sys/malloc.h>
87 #include <sys/protosw.h>
88 #include <sys/systm.h>
89 #include <sys/jail.h>
90 #include <sys/time.h>
91 #include <sys/socket.h> /* for net/if.h */
92 #include <sys/sockio.h>
93 #include <sys/ctype.h> /* string functions */
94 #include <sys/kernel.h>
95 #include <sys/random.h>
96 #include <sys/syslog.h>
97 #include <sys/sysctl.h>
98 #include <vm/uma.h>
99 #include <sys/module.h>
100 #include <sys/priv.h>
101 #include <sys/proc.h>
102 #include <sys/lock.h>
103 #include <sys/mutex.h>
104
105 #include <net/bpf.h>
106 #include <net/if.h>
107 #include <net/if_clone.h>
108 #include <net/if_dl.h>
109 #include <net/if_types.h>
110 #include <net/if_var.h>
111 #include <net/if_private.h>
112 #include <net/pfil.h>
113 #include <net/vnet.h>
114
115 #include <netinet/in.h>
116 #include <netinet/in_systm.h>
117 #include <netinet/in_var.h>
118 #include <netinet/ip.h>
119 #include <netinet/ip_var.h>
120 #ifdef INET6
121 #include <netinet/ip6.h>
122 #include <netinet6/ip6_var.h>
123 #include <netinet6/in6_ifattach.h>
124 #endif
125 #if defined(INET) || defined(INET6)
126 #include <netinet/ip_carp.h>
127 #endif
128 #include <machine/in_cksum.h>
129 #include <netinet/if_ether.h>
130 #include <net/bridgestp.h>
131 #include <net/if_bridgevar.h>
132 #include <net/if_llc.h>
133 #include <net/if_vlan_var.h>
134
135 #include <net/route.h>
136
137 /*
138 * At various points in the code we need to know if we're hooked into the INET
139 * and/or INET6 pfil. Define some macros to do that based on which IP versions
140 * are enabled in the kernel. This avoids littering the rest of the code with
141 * #ifnet INET6 to avoid referencing V_inet6_pfil_head.
142 */
143 #ifdef INET6
144 #define PFIL_HOOKED_IN_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head)
145 #define PFIL_HOOKED_OUT_INET6 PFIL_HOOKED_OUT(V_inet6_pfil_head)
146 #else
147 #define PFIL_HOOKED_IN_INET6 false
148 #define PFIL_HOOKED_OUT_INET6 false
149 #endif
150
151 #ifdef INET
152 #define PFIL_HOOKED_IN_INET PFIL_HOOKED_IN(V_inet_pfil_head)
153 #define PFIL_HOOKED_OUT_INET PFIL_HOOKED_OUT(V_inet_pfil_head)
154 #else
155 #define PFIL_HOOKED_IN_INET false
156 #define PFIL_HOOKED_OUT_INET false
157 #endif
158
159 #define PFIL_HOOKED_IN_46 (PFIL_HOOKED_IN_INET6 || PFIL_HOOKED_IN_INET)
160 #define PFIL_HOOKED_OUT_46 (PFIL_HOOKED_OUT_INET6 || PFIL_HOOKED_OUT_INET)
161
162 /*
163 * Size of the route hash table. Must be a power of two.
164 */
165 #ifndef BRIDGE_RTHASH_SIZE
166 #define BRIDGE_RTHASH_SIZE 1024
167 #endif
168
169 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
170
171 /*
172 * Default maximum number of addresses to cache.
173 */
174 #ifndef BRIDGE_RTABLE_MAX
175 #define BRIDGE_RTABLE_MAX 2000
176 #endif
177
178 /*
179 * Timeout (in seconds) for entries learned dynamically.
180 */
181 #ifndef BRIDGE_RTABLE_TIMEOUT
182 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
183 #endif
184
185 /*
186 * Number of seconds between walks of the route list.
187 */
188 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
189 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
190 #endif
191
192 /*
193 * List of capabilities to possibly mask on the member interface.
194 */
195 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
196 IFCAP_TXCSUM_IPV6)
197
198 /*
199 * List of capabilities to strip
200 */
201 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
202
203 /*
204 * Bridge locking
205 *
206 * The bridge relies heavily on the epoch(9) system to protect its data
207 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we
208 * must ensure there is only one writer at a time.
209 *
210 * That is: for read accesses we only need to be in NET_EPOCH, but for write
211 * accesses we must hold:
212 *
213 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes
214 * - BRIDGE_LOCK, for any other change
215 *
216 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl()
217 * calls to bridge member interfaces and these ioctl()s can sleep.
218 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes
219 * required while we're in NET_EPOCH and then we're not allowed to sleep.
220 */
221 #define BRIDGE_LOCK_INIT(_sc) do { \
222 sx_init(&(_sc)->sc_sx, "if_bridge"); \
223 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \
224 } while (0)
225 #define BRIDGE_LOCK_DESTROY(_sc) do { \
226 sx_destroy(&(_sc)->sc_sx); \
227 mtx_destroy(&(_sc)->sc_rt_mtx); \
228 } while (0)
229 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx)
230 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx)
231 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED)
232 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
233 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx))
234 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED)
235 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx)
236 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx)
237 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED)
238 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
239 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx))
240
241 /*
242 * Bridge interface list entry.
243 */
244 struct bridge_iflist {
245 CK_LIST_ENTRY(bridge_iflist) bif_next;
246 struct ifnet *bif_ifp; /* member if */
247 struct bstp_port bif_stp; /* STP state */
248 uint32_t bif_flags; /* member if flags */
249 int bif_savedcaps; /* saved capabilities */
250 uint32_t bif_addrmax; /* max # of addresses */
251 uint32_t bif_addrcnt; /* cur. # of addresses */
252 uint32_t bif_addrexceeded;/* # of address violations */
253 struct epoch_context bif_epoch_ctx;
254 };
255
256 /*
257 * Bridge route node.
258 */
259 struct bridge_rtnode {
260 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
261 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
262 struct bridge_iflist *brt_dst; /* destination if */
263 unsigned long brt_expire; /* expiration time */
264 uint8_t brt_flags; /* address flags */
265 uint8_t brt_addr[ETHER_ADDR_LEN];
266 uint16_t brt_vlan; /* vlan id */
267 struct vnet *brt_vnet;
268 struct epoch_context brt_epoch_ctx;
269 };
270 #define brt_ifp brt_dst->bif_ifp
271
272 /*
273 * Software state for each bridge.
274 */
275 struct bridge_softc {
276 struct ifnet *sc_ifp; /* make this an interface */
277 LIST_ENTRY(bridge_softc) sc_list;
278 struct sx sc_sx;
279 struct mtx sc_rt_mtx;
280 uint32_t sc_brtmax; /* max # of addresses */
281 uint32_t sc_brtcnt; /* cur. # of addresses */
282 uint32_t sc_brttimeout; /* rt timeout in seconds */
283 struct callout sc_brcallout; /* bridge callout */
284 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
285 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
286 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
287 uint32_t sc_rthash_key; /* key for hash */
288 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
289 struct bstp_state sc_stp; /* STP state */
290 uint32_t sc_brtexceeded; /* # of cache drops */
291 struct ifnet *sc_ifaddr; /* member mac copied from */
292 struct ether_addr sc_defaddr; /* Default MAC address */
293 if_input_fn_t sc_if_input; /* Saved copy of if_input */
294 struct epoch_context sc_epoch_ctx;
295 };
296
297 VNET_DEFINE_STATIC(struct sx, bridge_list_sx);
298 #define V_bridge_list_sx VNET(bridge_list_sx)
299 static eventhandler_tag bridge_detach_cookie;
300
301 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
302
303 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
304 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone)
305
306 static int bridge_clone_create(struct if_clone *, char *, size_t,
307 struct ifc_data *, struct ifnet **);
308 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t);
309
310 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
311 static void bridge_mutecaps(struct bridge_softc *);
312 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
313 int);
314 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
315 static void bridge_init(void *);
316 static void bridge_dummynet(struct mbuf *, struct ifnet *);
317 static void bridge_stop(struct ifnet *, int);
318 static int bridge_transmit(struct ifnet *, struct mbuf *);
319 #ifdef ALTQ
320 static void bridge_altq_start(if_t);
321 static int bridge_altq_transmit(if_t, struct mbuf *);
322 #endif
323 static void bridge_qflush(struct ifnet *);
324 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
325 static void bridge_inject(struct ifnet *, struct mbuf *);
326 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
327 struct rtentry *);
328 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
329 struct mbuf *);
330 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
331
332 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
333 struct mbuf *m);
334
335 static void bridge_timer(void *);
336
337 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
338 struct mbuf *, int);
339 static void bridge_span(struct bridge_softc *, struct mbuf *);
340
341 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
342 uint16_t, struct bridge_iflist *, int, uint8_t);
343 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
344 uint16_t);
345 static void bridge_rttrim(struct bridge_softc *);
346 static void bridge_rtage(struct bridge_softc *);
347 static void bridge_rtflush(struct bridge_softc *, int);
348 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
349 uint16_t);
350
351 static void bridge_rtable_init(struct bridge_softc *);
352 static void bridge_rtable_fini(struct bridge_softc *);
353
354 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
355 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
356 const uint8_t *, uint16_t);
357 static int bridge_rtnode_insert(struct bridge_softc *,
358 struct bridge_rtnode *);
359 static void bridge_rtnode_destroy(struct bridge_softc *,
360 struct bridge_rtnode *);
361 static void bridge_rtable_expire(struct ifnet *, int);
362 static void bridge_state_change(struct ifnet *, int);
363
364 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
365 const char *name);
366 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
367 struct ifnet *ifp);
368 static void bridge_delete_member(struct bridge_softc *,
369 struct bridge_iflist *, int);
370 static void bridge_delete_span(struct bridge_softc *,
371 struct bridge_iflist *);
372
373 static int bridge_ioctl_add(struct bridge_softc *, void *);
374 static int bridge_ioctl_del(struct bridge_softc *, void *);
375 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
376 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
377 static int bridge_ioctl_scache(struct bridge_softc *, void *);
378 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
379 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
380 static int bridge_ioctl_rts(struct bridge_softc *, void *);
381 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
382 static int bridge_ioctl_sto(struct bridge_softc *, void *);
383 static int bridge_ioctl_gto(struct bridge_softc *, void *);
384 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
385 static int bridge_ioctl_flush(struct bridge_softc *, void *);
386 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
387 static int bridge_ioctl_spri(struct bridge_softc *, void *);
388 static int bridge_ioctl_ght(struct bridge_softc *, void *);
389 static int bridge_ioctl_sht(struct bridge_softc *, void *);
390 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
391 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
392 static int bridge_ioctl_gma(struct bridge_softc *, void *);
393 static int bridge_ioctl_sma(struct bridge_softc *, void *);
394 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
395 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
396 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
397 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
398 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
399 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
400 static int bridge_ioctl_grte(struct bridge_softc *, void *);
401 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
402 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
403 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
404 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
405 int);
406 #ifdef INET
407 static int bridge_ip_checkbasic(struct mbuf **mp);
408 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
409 struct ether_header *, int, struct llc *);
410 #endif /* INET */
411 #ifdef INET6
412 static int bridge_ip6_checkbasic(struct mbuf **mp);
413 #endif /* INET6 */
414 static void bridge_linkstate(struct ifnet *ifp);
415 static void bridge_linkcheck(struct bridge_softc *sc);
416
417 /*
418 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2
419 * to indicate untagged frames.
420 */
421 #define VLANTAGOF(_m) \
422 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL
423
424 static struct bstp_cb_ops bridge_ops = {
425 .bcb_state = bridge_state_change,
426 .bcb_rtage = bridge_rtable_expire
427 };
428
429 SYSCTL_DECL(_net_link);
430 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
431 "Bridge");
432
433 /* only pass IP[46] packets when pfil is enabled */
434 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
435 #define V_pfil_onlyip VNET(pfil_onlyip)
436 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
437 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
438 "Only pass IP packets when pfil is enabled");
439
440 /* run pfil hooks on the bridge interface */
441 VNET_DEFINE_STATIC(int, pfil_bridge) = 0;
442 #define V_pfil_bridge VNET(pfil_bridge)
443 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
444 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
445 "Packet filter on the bridge interface");
446
447 /* layer2 filter with ipfw */
448 VNET_DEFINE_STATIC(int, pfil_ipfw);
449 #define V_pfil_ipfw VNET(pfil_ipfw)
450
451 /* layer2 ARP filter with ipfw */
452 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
453 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
454 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
455 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
456 "Filter ARP packets through IPFW layer2");
457
458 /* run pfil hooks on the member interface */
459 VNET_DEFINE_STATIC(int, pfil_member) = 0;
460 #define V_pfil_member VNET(pfil_member)
461 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
462 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
463 "Packet filter on the member interface");
464
465 /* run pfil hooks on the physical interface for locally destined packets */
466 VNET_DEFINE_STATIC(int, pfil_local_phys);
467 #define V_pfil_local_phys VNET(pfil_local_phys)
468 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
469 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
470 "Packet filter on the physical interface for locally destined packets");
471
472 /* log STP state changes */
473 VNET_DEFINE_STATIC(int, log_stp);
474 #define V_log_stp VNET(log_stp)
475 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
476 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
477 "Log STP state changes");
478
479 /* share MAC with first bridge member */
480 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
481 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
482 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
483 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
484 "Inherit MAC address from the first bridge member");
485
486 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
487 #define V_allow_llz_overlap VNET(allow_llz_overlap)
488 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
489 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
490 "Allow overlap of link-local scope "
491 "zones of a bridge interface and the member interfaces");
492
493 /* log MAC address port flapping */
494 VNET_DEFINE_STATIC(bool, log_mac_flap) = true;
495 #define V_log_mac_flap VNET(log_mac_flap)
496 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap,
497 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true,
498 "Log MAC address port flapping");
499
500 VNET_DEFINE_STATIC(int, log_interval) = 5;
501 VNET_DEFINE_STATIC(int, log_count) = 0;
502 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 };
503
504 #define V_log_interval VNET(log_interval)
505 #define V_log_count VNET(log_count)
506 #define V_log_last VNET(log_last)
507
508 struct bridge_control {
509 int (*bc_func)(struct bridge_softc *, void *);
510 int bc_argsize;
511 int bc_flags;
512 };
513
514 #define BC_F_COPYIN 0x01 /* copy arguments in */
515 #define BC_F_COPYOUT 0x02 /* copy arguments out */
516 #define BC_F_SUSER 0x04 /* do super-user check */
517
518 static const struct bridge_control bridge_control_table[] = {
519 { bridge_ioctl_add, sizeof(struct ifbreq),
520 BC_F_COPYIN|BC_F_SUSER },
521 { bridge_ioctl_del, sizeof(struct ifbreq),
522 BC_F_COPYIN|BC_F_SUSER },
523
524 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
525 BC_F_COPYIN|BC_F_COPYOUT },
526 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
527 BC_F_COPYIN|BC_F_SUSER },
528
529 { bridge_ioctl_scache, sizeof(struct ifbrparam),
530 BC_F_COPYIN|BC_F_SUSER },
531 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
532 BC_F_COPYOUT },
533
534 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
535 BC_F_COPYIN|BC_F_COPYOUT },
536 { bridge_ioctl_rts, sizeof(struct ifbaconf),
537 BC_F_COPYIN|BC_F_COPYOUT },
538
539 { bridge_ioctl_saddr, sizeof(struct ifbareq),
540 BC_F_COPYIN|BC_F_SUSER },
541
542 { bridge_ioctl_sto, sizeof(struct ifbrparam),
543 BC_F_COPYIN|BC_F_SUSER },
544 { bridge_ioctl_gto, sizeof(struct ifbrparam),
545 BC_F_COPYOUT },
546
547 { bridge_ioctl_daddr, sizeof(struct ifbareq),
548 BC_F_COPYIN|BC_F_SUSER },
549
550 { bridge_ioctl_flush, sizeof(struct ifbreq),
551 BC_F_COPYIN|BC_F_SUSER },
552
553 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
554 BC_F_COPYOUT },
555 { bridge_ioctl_spri, sizeof(struct ifbrparam),
556 BC_F_COPYIN|BC_F_SUSER },
557
558 { bridge_ioctl_ght, sizeof(struct ifbrparam),
559 BC_F_COPYOUT },
560 { bridge_ioctl_sht, sizeof(struct ifbrparam),
561 BC_F_COPYIN|BC_F_SUSER },
562
563 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
564 BC_F_COPYOUT },
565 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
566 BC_F_COPYIN|BC_F_SUSER },
567
568 { bridge_ioctl_gma, sizeof(struct ifbrparam),
569 BC_F_COPYOUT },
570 { bridge_ioctl_sma, sizeof(struct ifbrparam),
571 BC_F_COPYIN|BC_F_SUSER },
572
573 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
574 BC_F_COPYIN|BC_F_SUSER },
575
576 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
577 BC_F_COPYIN|BC_F_SUSER },
578
579 { bridge_ioctl_addspan, sizeof(struct ifbreq),
580 BC_F_COPYIN|BC_F_SUSER },
581 { bridge_ioctl_delspan, sizeof(struct ifbreq),
582 BC_F_COPYIN|BC_F_SUSER },
583
584 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
585 BC_F_COPYOUT },
586
587 { bridge_ioctl_grte, sizeof(struct ifbrparam),
588 BC_F_COPYOUT },
589
590 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
591 BC_F_COPYIN|BC_F_COPYOUT },
592
593 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
594 BC_F_COPYIN|BC_F_SUSER },
595
596 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
597 BC_F_COPYIN|BC_F_SUSER },
598
599 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
600 BC_F_COPYIN|BC_F_SUSER },
601
602 };
603 static const int bridge_control_table_size = nitems(bridge_control_table);
604
605 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
606 #define V_bridge_list VNET(bridge_list)
607 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \
608 "if_bridge list")
609 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx)
610 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx)
611 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx)
612
613 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
614 #define V_bridge_cloner VNET(bridge_cloner)
615
616 static const char bridge_name[] = "bridge";
617
618 static void
vnet_bridge_init(const void * unused __unused)619 vnet_bridge_init(const void *unused __unused)
620 {
621
622 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
623 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
624 UMA_ALIGN_PTR, 0);
625 BRIDGE_LIST_LOCK_INIT();
626 LIST_INIT(&V_bridge_list);
627
628 struct if_clone_addreq req = {
629 .create_f = bridge_clone_create,
630 .destroy_f = bridge_clone_destroy,
631 .flags = IFC_F_AUTOUNIT,
632 };
633 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req);
634 }
635 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
636 vnet_bridge_init, NULL);
637
638 static void
vnet_bridge_uninit(const void * unused __unused)639 vnet_bridge_uninit(const void *unused __unused)
640 {
641
642 ifc_detach_cloner(V_bridge_cloner);
643 V_bridge_cloner = NULL;
644 BRIDGE_LIST_LOCK_DESTROY();
645
646 /* Callbacks may use the UMA zone. */
647 NET_EPOCH_DRAIN_CALLBACKS();
648
649 uma_zdestroy(V_bridge_rtnode_zone);
650 }
651 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
652 vnet_bridge_uninit, NULL);
653
654 static int
bridge_modevent(module_t mod,int type,void * data)655 bridge_modevent(module_t mod, int type, void *data)
656 {
657
658 switch (type) {
659 case MOD_LOAD:
660 bridge_dn_p = bridge_dummynet;
661 bridge_detach_cookie = EVENTHANDLER_REGISTER(
662 ifnet_departure_event, bridge_ifdetach, NULL,
663 EVENTHANDLER_PRI_ANY);
664 break;
665 case MOD_UNLOAD:
666 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
667 bridge_detach_cookie);
668 bridge_dn_p = NULL;
669 break;
670 default:
671 return (EOPNOTSUPP);
672 }
673 return (0);
674 }
675
676 static moduledata_t bridge_mod = {
677 "if_bridge",
678 bridge_modevent,
679 0
680 };
681
682 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
683 MODULE_VERSION(if_bridge, 1);
684 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
685
686 /*
687 * handler for net.link.bridge.ipfw
688 */
689 static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)690 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
691 {
692 int enable = V_pfil_ipfw;
693 int error;
694
695 error = sysctl_handle_int(oidp, &enable, 0, req);
696 enable &= 1;
697
698 if (enable != V_pfil_ipfw) {
699 V_pfil_ipfw = enable;
700
701 /*
702 * Disable pfil so that ipfw doesnt run twice, if the user
703 * really wants both then they can re-enable pfil_bridge and/or
704 * pfil_member. Also allow non-ip packets as ipfw can filter by
705 * layer2 type.
706 */
707 if (V_pfil_ipfw) {
708 V_pfil_onlyip = 0;
709 V_pfil_bridge = 0;
710 V_pfil_member = 0;
711 }
712 }
713
714 return (error);
715 }
716 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
717 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
718 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
719 "Layer2 filter with IPFW");
720
721 #ifdef VIMAGE
722 static void
bridge_reassign(struct ifnet * ifp,struct vnet * newvnet,char * arg)723 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg)
724 {
725 struct bridge_softc *sc = ifp->if_softc;
726 struct bridge_iflist *bif;
727
728 BRIDGE_LOCK(sc);
729
730 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
731 bridge_delete_member(sc, bif, 0);
732
733 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
734 bridge_delete_span(sc, bif);
735 }
736
737 BRIDGE_UNLOCK(sc);
738
739 ether_reassign(ifp, newvnet, arg);
740 }
741 #endif
742
743 /*
744 * bridge_clone_create:
745 *
746 * Create a new bridge instance.
747 */
748 static int
bridge_clone_create(struct if_clone * ifc,char * name,size_t len,struct ifc_data * ifd,struct ifnet ** ifpp)749 bridge_clone_create(struct if_clone *ifc, char *name, size_t len,
750 struct ifc_data *ifd, struct ifnet **ifpp)
751 {
752 struct bridge_softc *sc;
753 struct ifnet *ifp;
754
755 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
756 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
757 if (ifp == NULL) {
758 free(sc, M_DEVBUF);
759 return (ENOSPC);
760 }
761
762 BRIDGE_LOCK_INIT(sc);
763 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
764 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
765
766 /* Initialize our routing table. */
767 bridge_rtable_init(sc);
768
769 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0);
770
771 CK_LIST_INIT(&sc->sc_iflist);
772 CK_LIST_INIT(&sc->sc_spanlist);
773
774 ifp->if_softc = sc;
775 if_initname(ifp, bridge_name, ifd->unit);
776 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
777 ifp->if_ioctl = bridge_ioctl;
778 #ifdef ALTQ
779 ifp->if_start = bridge_altq_start;
780 ifp->if_transmit = bridge_altq_transmit;
781 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
782 ifp->if_snd.ifq_drv_maxlen = 0;
783 IFQ_SET_READY(&ifp->if_snd);
784 #else
785 ifp->if_transmit = bridge_transmit;
786 #endif
787 ifp->if_qflush = bridge_qflush;
788 ifp->if_init = bridge_init;
789 ifp->if_type = IFT_BRIDGE;
790
791 ether_gen_addr(ifp, &sc->sc_defaddr);
792
793 bstp_attach(&sc->sc_stp, &bridge_ops);
794 ether_ifattach(ifp, sc->sc_defaddr.octet);
795 /* Now undo some of the damage... */
796 ifp->if_baudrate = 0;
797 ifp->if_type = IFT_BRIDGE;
798 #ifdef VIMAGE
799 ifp->if_reassign = bridge_reassign;
800 #endif
801 sc->sc_if_input = ifp->if_input; /* ether_input */
802 ifp->if_input = bridge_inject;
803
804 /*
805 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge
806 * itself via bridge_inject(). This is required for netmap but
807 * otherwise has no effect.
808 */
809 ifp->if_bridge_input = bridge_input;
810
811 BRIDGE_LIST_LOCK();
812 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
813 BRIDGE_LIST_UNLOCK();
814 *ifpp = ifp;
815
816 return (0);
817 }
818
819 static void
bridge_clone_destroy_cb(struct epoch_context * ctx)820 bridge_clone_destroy_cb(struct epoch_context *ctx)
821 {
822 struct bridge_softc *sc;
823
824 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx);
825
826 BRIDGE_LOCK_DESTROY(sc);
827 free(sc, M_DEVBUF);
828 }
829
830 /*
831 * bridge_clone_destroy:
832 *
833 * Destroy a bridge instance.
834 */
835 static int
bridge_clone_destroy(struct if_clone * ifc,struct ifnet * ifp,uint32_t flags)836 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
837 {
838 struct bridge_softc *sc = ifp->if_softc;
839 struct bridge_iflist *bif;
840 struct epoch_tracker et;
841
842 BRIDGE_LOCK(sc);
843
844 bridge_stop(ifp, 1);
845 ifp->if_flags &= ~IFF_UP;
846
847 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
848 bridge_delete_member(sc, bif, 0);
849
850 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
851 bridge_delete_span(sc, bif);
852 }
853
854 /* Tear down the routing table. */
855 bridge_rtable_fini(sc);
856
857 BRIDGE_UNLOCK(sc);
858
859 NET_EPOCH_ENTER(et);
860
861 callout_drain(&sc->sc_brcallout);
862
863 BRIDGE_LIST_LOCK();
864 LIST_REMOVE(sc, sc_list);
865 BRIDGE_LIST_UNLOCK();
866
867 bstp_detach(&sc->sc_stp);
868 #ifdef ALTQ
869 IFQ_PURGE(&ifp->if_snd);
870 #endif
871 NET_EPOCH_EXIT(et);
872
873 ether_ifdetach(ifp);
874 if_free(ifp);
875
876 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx);
877
878 return (0);
879 }
880
881 /*
882 * bridge_ioctl:
883 *
884 * Handle a control request from the operator.
885 */
886 static int
bridge_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)887 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
888 {
889 struct bridge_softc *sc = ifp->if_softc;
890 struct ifreq *ifr = (struct ifreq *)data;
891 struct bridge_iflist *bif;
892 struct thread *td = curthread;
893 union {
894 struct ifbreq ifbreq;
895 struct ifbifconf ifbifconf;
896 struct ifbareq ifbareq;
897 struct ifbaconf ifbaconf;
898 struct ifbrparam ifbrparam;
899 struct ifbropreq ifbropreq;
900 } args;
901 struct ifdrv *ifd = (struct ifdrv *) data;
902 const struct bridge_control *bc;
903 int error = 0, oldmtu;
904
905 BRIDGE_LOCK(sc);
906
907 switch (cmd) {
908 case SIOCADDMULTI:
909 case SIOCDELMULTI:
910 break;
911
912 case SIOCGDRVSPEC:
913 case SIOCSDRVSPEC:
914 if (ifd->ifd_cmd >= bridge_control_table_size) {
915 error = EINVAL;
916 break;
917 }
918 bc = &bridge_control_table[ifd->ifd_cmd];
919
920 if (cmd == SIOCGDRVSPEC &&
921 (bc->bc_flags & BC_F_COPYOUT) == 0) {
922 error = EINVAL;
923 break;
924 }
925 else if (cmd == SIOCSDRVSPEC &&
926 (bc->bc_flags & BC_F_COPYOUT) != 0) {
927 error = EINVAL;
928 break;
929 }
930
931 if (bc->bc_flags & BC_F_SUSER) {
932 error = priv_check(td, PRIV_NET_BRIDGE);
933 if (error)
934 break;
935 }
936
937 if (ifd->ifd_len != bc->bc_argsize ||
938 ifd->ifd_len > sizeof(args)) {
939 error = EINVAL;
940 break;
941 }
942
943 bzero(&args, sizeof(args));
944 if (bc->bc_flags & BC_F_COPYIN) {
945 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
946 if (error)
947 break;
948 }
949
950 oldmtu = ifp->if_mtu;
951 error = (*bc->bc_func)(sc, &args);
952 if (error)
953 break;
954
955 /*
956 * Bridge MTU may change during addition of the first port.
957 * If it did, do network layer specific procedure.
958 */
959 if (ifp->if_mtu != oldmtu)
960 if_notifymtu(ifp);
961
962 if (bc->bc_flags & BC_F_COPYOUT)
963 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
964
965 break;
966
967 case SIOCSIFFLAGS:
968 if (!(ifp->if_flags & IFF_UP) &&
969 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
970 /*
971 * If interface is marked down and it is running,
972 * then stop and disable it.
973 */
974 bridge_stop(ifp, 1);
975 } else if ((ifp->if_flags & IFF_UP) &&
976 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
977 /*
978 * If interface is marked up and it is stopped, then
979 * start it.
980 */
981 BRIDGE_UNLOCK(sc);
982 (*ifp->if_init)(sc);
983 BRIDGE_LOCK(sc);
984 }
985 break;
986
987 case SIOCSIFMTU:
988 oldmtu = sc->sc_ifp->if_mtu;
989
990 if (ifr->ifr_mtu < IF_MINMTU) {
991 error = EINVAL;
992 break;
993 }
994 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
995 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
996 break;
997 }
998 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
999 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
1000 SIOCSIFMTU, (caddr_t)ifr);
1001 if (error != 0) {
1002 log(LOG_NOTICE, "%s: invalid MTU: %u for"
1003 " member %s\n", sc->sc_ifp->if_xname,
1004 ifr->ifr_mtu,
1005 bif->bif_ifp->if_xname);
1006 error = EINVAL;
1007 break;
1008 }
1009 }
1010 if (error) {
1011 /* Restore the previous MTU on all member interfaces. */
1012 ifr->ifr_mtu = oldmtu;
1013 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1014 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
1015 SIOCSIFMTU, (caddr_t)ifr);
1016 }
1017 } else {
1018 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
1019 }
1020 break;
1021 default:
1022 /*
1023 * drop the lock as ether_ioctl() will call bridge_start() and
1024 * cause the lock to be recursed.
1025 */
1026 BRIDGE_UNLOCK(sc);
1027 error = ether_ioctl(ifp, cmd, data);
1028 BRIDGE_LOCK(sc);
1029 break;
1030 }
1031
1032 BRIDGE_UNLOCK(sc);
1033
1034 return (error);
1035 }
1036
1037 /*
1038 * bridge_mutecaps:
1039 *
1040 * Clear or restore unwanted capabilities on the member interface
1041 */
1042 static void
bridge_mutecaps(struct bridge_softc * sc)1043 bridge_mutecaps(struct bridge_softc *sc)
1044 {
1045 struct bridge_iflist *bif;
1046 int enabled, mask;
1047
1048 BRIDGE_LOCK_ASSERT(sc);
1049
1050 /* Initial bitmask of capabilities to test */
1051 mask = BRIDGE_IFCAPS_MASK;
1052
1053 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1054 /* Every member must support it or its disabled */
1055 mask &= bif->bif_savedcaps;
1056 }
1057
1058 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1059 enabled = bif->bif_ifp->if_capenable;
1060 enabled &= ~BRIDGE_IFCAPS_STRIP;
1061 /* strip off mask bits and enable them again if allowed */
1062 enabled &= ~BRIDGE_IFCAPS_MASK;
1063 enabled |= mask;
1064 bridge_set_ifcap(sc, bif, enabled);
1065 }
1066 }
1067
1068 static void
bridge_set_ifcap(struct bridge_softc * sc,struct bridge_iflist * bif,int set)1069 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
1070 {
1071 struct ifnet *ifp = bif->bif_ifp;
1072 struct ifreq ifr;
1073 int error, mask, stuck;
1074
1075 bzero(&ifr, sizeof(ifr));
1076 ifr.ifr_reqcap = set;
1077
1078 if (ifp->if_capenable != set) {
1079 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
1080 if (error)
1081 if_printf(sc->sc_ifp,
1082 "error setting capabilities on %s: %d\n",
1083 ifp->if_xname, error);
1084 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1085 stuck = ifp->if_capenable & mask & ~set;
1086 if (stuck != 0)
1087 if_printf(sc->sc_ifp,
1088 "can't disable some capabilities on %s: 0x%x\n",
1089 ifp->if_xname, stuck);
1090 }
1091 }
1092
1093 /*
1094 * bridge_lookup_member:
1095 *
1096 * Lookup a bridge member interface.
1097 */
1098 static struct bridge_iflist *
bridge_lookup_member(struct bridge_softc * sc,const char * name)1099 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1100 {
1101 struct bridge_iflist *bif;
1102 struct ifnet *ifp;
1103
1104 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1105
1106 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1107 ifp = bif->bif_ifp;
1108 if (strcmp(ifp->if_xname, name) == 0)
1109 return (bif);
1110 }
1111
1112 return (NULL);
1113 }
1114
1115 /*
1116 * bridge_lookup_member_if:
1117 *
1118 * Lookup a bridge member interface by ifnet*.
1119 */
1120 static struct bridge_iflist *
bridge_lookup_member_if(struct bridge_softc * sc,struct ifnet * member_ifp)1121 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1122 {
1123 struct bridge_iflist *bif;
1124
1125 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1126
1127 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1128 if (bif->bif_ifp == member_ifp)
1129 return (bif);
1130 }
1131
1132 return (NULL);
1133 }
1134
1135 static void
bridge_delete_member_cb(struct epoch_context * ctx)1136 bridge_delete_member_cb(struct epoch_context *ctx)
1137 {
1138 struct bridge_iflist *bif;
1139
1140 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx);
1141
1142 free(bif, M_DEVBUF);
1143 }
1144
1145 /*
1146 * bridge_delete_member:
1147 *
1148 * Delete the specified member interface.
1149 */
1150 static void
bridge_delete_member(struct bridge_softc * sc,struct bridge_iflist * bif,int gone)1151 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1152 int gone)
1153 {
1154 struct ifnet *ifs = bif->bif_ifp;
1155 struct ifnet *fif = NULL;
1156 struct bridge_iflist *bifl;
1157
1158 BRIDGE_LOCK_ASSERT(sc);
1159
1160 if (bif->bif_flags & IFBIF_STP)
1161 bstp_disable(&bif->bif_stp);
1162
1163 ifs->if_bridge = NULL;
1164 CK_LIST_REMOVE(bif, bif_next);
1165
1166 /*
1167 * If removing the interface that gave the bridge its mac address, set
1168 * the mac address of the bridge to the address of the next member, or
1169 * to its default address if no members are left.
1170 */
1171 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1172 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1173 bcopy(&sc->sc_defaddr,
1174 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1175 sc->sc_ifaddr = NULL;
1176 } else {
1177 bifl = CK_LIST_FIRST(&sc->sc_iflist);
1178 fif = bifl->bif_ifp;
1179 bcopy(IF_LLADDR(fif),
1180 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1181 sc->sc_ifaddr = fif;
1182 }
1183 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1184 }
1185
1186 bridge_linkcheck(sc);
1187 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1188 BRIDGE_RT_LOCK(sc);
1189 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1190 BRIDGE_RT_UNLOCK(sc);
1191 KASSERT(bif->bif_addrcnt == 0,
1192 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1193
1194 ifs->if_bridge_output = NULL;
1195 ifs->if_bridge_input = NULL;
1196 ifs->if_bridge_linkstate = NULL;
1197 if (!gone) {
1198 switch (ifs->if_type) {
1199 case IFT_ETHER:
1200 case IFT_L2VLAN:
1201 /*
1202 * Take the interface out of promiscuous mode, but only
1203 * if it was promiscuous in the first place. It might
1204 * not be if we're in the bridge_ioctl_add() error path.
1205 */
1206 if (ifs->if_flags & IFF_PROMISC)
1207 (void) ifpromisc(ifs, 0);
1208 break;
1209
1210 case IFT_GIF:
1211 break;
1212
1213 default:
1214 #ifdef DIAGNOSTIC
1215 panic("bridge_delete_member: impossible");
1216 #endif
1217 break;
1218 }
1219 /* reneable any interface capabilities */
1220 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1221 }
1222 bstp_destroy(&bif->bif_stp); /* prepare to free */
1223
1224 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1225 }
1226
1227 /*
1228 * bridge_delete_span:
1229 *
1230 * Delete the specified span interface.
1231 */
1232 static void
bridge_delete_span(struct bridge_softc * sc,struct bridge_iflist * bif)1233 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1234 {
1235 BRIDGE_LOCK_ASSERT(sc);
1236
1237 KASSERT(bif->bif_ifp->if_bridge == NULL,
1238 ("%s: not a span interface", __func__));
1239
1240 CK_LIST_REMOVE(bif, bif_next);
1241
1242 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1243 }
1244
1245 static int
bridge_ioctl_add(struct bridge_softc * sc,void * arg)1246 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1247 {
1248 struct ifbreq *req = arg;
1249 struct bridge_iflist *bif = NULL;
1250 struct ifnet *ifs;
1251 int error = 0;
1252
1253 ifs = ifunit(req->ifbr_ifsname);
1254 if (ifs == NULL)
1255 return (ENOENT);
1256 if (ifs->if_ioctl == NULL) /* must be supported */
1257 return (EINVAL);
1258
1259 /* If it's in the span list, it can't be a member. */
1260 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1261 if (ifs == bif->bif_ifp)
1262 return (EBUSY);
1263
1264 if (ifs->if_bridge == sc)
1265 return (EEXIST);
1266
1267 if (ifs->if_bridge != NULL)
1268 return (EBUSY);
1269
1270 switch (ifs->if_type) {
1271 case IFT_ETHER:
1272 case IFT_L2VLAN:
1273 case IFT_GIF:
1274 /* permitted interface types */
1275 break;
1276 default:
1277 return (EINVAL);
1278 }
1279
1280 #ifdef INET6
1281 /*
1282 * Two valid inet6 addresses with link-local scope must not be
1283 * on the parent interface and the member interfaces at the
1284 * same time. This restriction is needed to prevent violation
1285 * of link-local scope zone. Attempts to add a member
1286 * interface which has inet6 addresses when the parent has
1287 * inet6 triggers removal of all inet6 addresses on the member
1288 * interface.
1289 */
1290
1291 /* Check if the parent interface has a link-local scope addr. */
1292 if (V_allow_llz_overlap == 0 &&
1293 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1294 /*
1295 * If any, remove all inet6 addresses from the member
1296 * interfaces.
1297 */
1298 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1299 if (in6ifa_llaonifp(bif->bif_ifp)) {
1300 in6_ifdetach(bif->bif_ifp);
1301 if_printf(sc->sc_ifp,
1302 "IPv6 addresses on %s have been removed "
1303 "before adding it as a member to prevent "
1304 "IPv6 address scope violation.\n",
1305 bif->bif_ifp->if_xname);
1306 }
1307 }
1308 if (in6ifa_llaonifp(ifs)) {
1309 in6_ifdetach(ifs);
1310 if_printf(sc->sc_ifp,
1311 "IPv6 addresses on %s have been removed "
1312 "before adding it as a member to prevent "
1313 "IPv6 address scope violation.\n",
1314 ifs->if_xname);
1315 }
1316 }
1317 #endif
1318 /* Allow the first Ethernet member to define the MTU */
1319 if (CK_LIST_EMPTY(&sc->sc_iflist))
1320 sc->sc_ifp->if_mtu = ifs->if_mtu;
1321 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1322 struct ifreq ifr;
1323
1324 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s",
1325 ifs->if_xname);
1326 ifr.ifr_mtu = sc->sc_ifp->if_mtu;
1327
1328 error = (*ifs->if_ioctl)(ifs,
1329 SIOCSIFMTU, (caddr_t)&ifr);
1330 if (error != 0) {
1331 log(LOG_NOTICE, "%s: invalid MTU: %u for"
1332 " new member %s\n", sc->sc_ifp->if_xname,
1333 ifr.ifr_mtu,
1334 ifs->if_xname);
1335 return (EINVAL);
1336 }
1337 }
1338
1339 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1340 if (bif == NULL)
1341 return (ENOMEM);
1342
1343 bif->bif_ifp = ifs;
1344 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1345 bif->bif_savedcaps = ifs->if_capenable;
1346
1347 /*
1348 * Assign the interface's MAC address to the bridge if it's the first
1349 * member and the MAC address of the bridge has not been changed from
1350 * the default randomly generated one.
1351 */
1352 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1353 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1354 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1355 sc->sc_ifaddr = ifs;
1356 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1357 }
1358
1359 ifs->if_bridge = sc;
1360 ifs->if_bridge_output = bridge_output;
1361 ifs->if_bridge_input = bridge_input;
1362 ifs->if_bridge_linkstate = bridge_linkstate;
1363 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1364 /*
1365 * XXX: XLOCK HERE!?!
1366 *
1367 * NOTE: insert_***HEAD*** should be safe for the traversals.
1368 */
1369 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1370
1371 /* Set interface capabilities to the intersection set of all members */
1372 bridge_mutecaps(sc);
1373 bridge_linkcheck(sc);
1374
1375 /* Place the interface into promiscuous mode */
1376 switch (ifs->if_type) {
1377 case IFT_ETHER:
1378 case IFT_L2VLAN:
1379 error = ifpromisc(ifs, 1);
1380 break;
1381 }
1382
1383 if (error)
1384 bridge_delete_member(sc, bif, 0);
1385 return (error);
1386 }
1387
1388 static int
bridge_ioctl_del(struct bridge_softc * sc,void * arg)1389 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1390 {
1391 struct ifbreq *req = arg;
1392 struct bridge_iflist *bif;
1393
1394 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1395 if (bif == NULL)
1396 return (ENOENT);
1397
1398 bridge_delete_member(sc, bif, 0);
1399
1400 return (0);
1401 }
1402
1403 static int
bridge_ioctl_gifflags(struct bridge_softc * sc,void * arg)1404 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1405 {
1406 struct ifbreq *req = arg;
1407 struct bridge_iflist *bif;
1408 struct bstp_port *bp;
1409
1410 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1411 if (bif == NULL)
1412 return (ENOENT);
1413
1414 bp = &bif->bif_stp;
1415 req->ifbr_ifsflags = bif->bif_flags;
1416 req->ifbr_state = bp->bp_state;
1417 req->ifbr_priority = bp->bp_priority;
1418 req->ifbr_path_cost = bp->bp_path_cost;
1419 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1420 req->ifbr_proto = bp->bp_protover;
1421 req->ifbr_role = bp->bp_role;
1422 req->ifbr_stpflags = bp->bp_flags;
1423 req->ifbr_addrcnt = bif->bif_addrcnt;
1424 req->ifbr_addrmax = bif->bif_addrmax;
1425 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1426
1427 /* Copy STP state options as flags */
1428 if (bp->bp_operedge)
1429 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1430 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1431 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1432 if (bp->bp_ptp_link)
1433 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1434 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1435 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1436 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1437 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1438 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1439 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1440 return (0);
1441 }
1442
1443 static int
bridge_ioctl_sifflags(struct bridge_softc * sc,void * arg)1444 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1445 {
1446 struct epoch_tracker et;
1447 struct ifbreq *req = arg;
1448 struct bridge_iflist *bif;
1449 struct bstp_port *bp;
1450 int error;
1451
1452 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1453 if (bif == NULL)
1454 return (ENOENT);
1455 bp = &bif->bif_stp;
1456
1457 if (req->ifbr_ifsflags & IFBIF_SPAN)
1458 /* SPAN is readonly */
1459 return (EINVAL);
1460
1461 NET_EPOCH_ENTER(et);
1462
1463 if (req->ifbr_ifsflags & IFBIF_STP) {
1464 if ((bif->bif_flags & IFBIF_STP) == 0) {
1465 error = bstp_enable(&bif->bif_stp);
1466 if (error) {
1467 NET_EPOCH_EXIT(et);
1468 return (error);
1469 }
1470 }
1471 } else {
1472 if ((bif->bif_flags & IFBIF_STP) != 0)
1473 bstp_disable(&bif->bif_stp);
1474 }
1475
1476 /* Pass on STP flags */
1477 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1478 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1479 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1480 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1481
1482 /* Save the bits relating to the bridge */
1483 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1484
1485 NET_EPOCH_EXIT(et);
1486
1487 return (0);
1488 }
1489
1490 static int
bridge_ioctl_scache(struct bridge_softc * sc,void * arg)1491 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1492 {
1493 struct ifbrparam *param = arg;
1494
1495 sc->sc_brtmax = param->ifbrp_csize;
1496 bridge_rttrim(sc);
1497
1498 return (0);
1499 }
1500
1501 static int
bridge_ioctl_gcache(struct bridge_softc * sc,void * arg)1502 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1503 {
1504 struct ifbrparam *param = arg;
1505
1506 param->ifbrp_csize = sc->sc_brtmax;
1507
1508 return (0);
1509 }
1510
1511 static int
bridge_ioctl_gifs(struct bridge_softc * sc,void * arg)1512 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1513 {
1514 struct ifbifconf *bifc = arg;
1515 struct bridge_iflist *bif;
1516 struct ifbreq breq;
1517 char *buf, *outbuf;
1518 int count, buflen, len, error = 0;
1519
1520 count = 0;
1521 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1522 count++;
1523 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1524 count++;
1525
1526 buflen = sizeof(breq) * count;
1527 if (bifc->ifbic_len == 0) {
1528 bifc->ifbic_len = buflen;
1529 return (0);
1530 }
1531 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1532 if (outbuf == NULL)
1533 return (ENOMEM);
1534
1535 count = 0;
1536 buf = outbuf;
1537 len = min(bifc->ifbic_len, buflen);
1538 bzero(&breq, sizeof(breq));
1539 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1540 if (len < sizeof(breq))
1541 break;
1542
1543 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1544 sizeof(breq.ifbr_ifsname));
1545 /* Fill in the ifbreq structure */
1546 error = bridge_ioctl_gifflags(sc, &breq);
1547 if (error)
1548 break;
1549 memcpy(buf, &breq, sizeof(breq));
1550 count++;
1551 buf += sizeof(breq);
1552 len -= sizeof(breq);
1553 }
1554 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1555 if (len < sizeof(breq))
1556 break;
1557
1558 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1559 sizeof(breq.ifbr_ifsname));
1560 breq.ifbr_ifsflags = bif->bif_flags;
1561 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1562 memcpy(buf, &breq, sizeof(breq));
1563 count++;
1564 buf += sizeof(breq);
1565 len -= sizeof(breq);
1566 }
1567
1568 bifc->ifbic_len = sizeof(breq) * count;
1569 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1570 free(outbuf, M_TEMP);
1571 return (error);
1572 }
1573
1574 static int
bridge_ioctl_rts(struct bridge_softc * sc,void * arg)1575 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1576 {
1577 struct ifbaconf *bac = arg;
1578 struct bridge_rtnode *brt;
1579 struct ifbareq bareq;
1580 char *buf, *outbuf;
1581 int count, buflen, len, error = 0;
1582
1583 if (bac->ifbac_len == 0)
1584 return (0);
1585
1586 count = 0;
1587 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1588 count++;
1589 buflen = sizeof(bareq) * count;
1590
1591 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1592 if (outbuf == NULL)
1593 return (ENOMEM);
1594
1595 count = 0;
1596 buf = outbuf;
1597 len = min(bac->ifbac_len, buflen);
1598 bzero(&bareq, sizeof(bareq));
1599 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1600 if (len < sizeof(bareq))
1601 goto out;
1602 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1603 sizeof(bareq.ifba_ifsname));
1604 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1605 bareq.ifba_vlan = brt->brt_vlan;
1606 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1607 time_uptime < brt->brt_expire)
1608 bareq.ifba_expire = brt->brt_expire - time_uptime;
1609 else
1610 bareq.ifba_expire = 0;
1611 bareq.ifba_flags = brt->brt_flags;
1612
1613 memcpy(buf, &bareq, sizeof(bareq));
1614 count++;
1615 buf += sizeof(bareq);
1616 len -= sizeof(bareq);
1617 }
1618 out:
1619 bac->ifbac_len = sizeof(bareq) * count;
1620 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1621 free(outbuf, M_TEMP);
1622 return (error);
1623 }
1624
1625 static int
bridge_ioctl_saddr(struct bridge_softc * sc,void * arg)1626 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1627 {
1628 struct ifbareq *req = arg;
1629 struct bridge_iflist *bif;
1630 struct epoch_tracker et;
1631 int error;
1632
1633 NET_EPOCH_ENTER(et);
1634 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1635 if (bif == NULL) {
1636 NET_EPOCH_EXIT(et);
1637 return (ENOENT);
1638 }
1639
1640 /* bridge_rtupdate() may acquire the lock. */
1641 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1642 req->ifba_flags);
1643 NET_EPOCH_EXIT(et);
1644
1645 return (error);
1646 }
1647
1648 static int
bridge_ioctl_sto(struct bridge_softc * sc,void * arg)1649 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1650 {
1651 struct ifbrparam *param = arg;
1652
1653 sc->sc_brttimeout = param->ifbrp_ctime;
1654 return (0);
1655 }
1656
1657 static int
bridge_ioctl_gto(struct bridge_softc * sc,void * arg)1658 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1659 {
1660 struct ifbrparam *param = arg;
1661
1662 param->ifbrp_ctime = sc->sc_brttimeout;
1663 return (0);
1664 }
1665
1666 static int
bridge_ioctl_daddr(struct bridge_softc * sc,void * arg)1667 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1668 {
1669 struct ifbareq *req = arg;
1670 int vlan = req->ifba_vlan;
1671
1672 /* Userspace uses '0' to mean 'any vlan' */
1673 if (vlan == 0)
1674 vlan = DOT1Q_VID_RSVD_IMPL;
1675
1676 return (bridge_rtdaddr(sc, req->ifba_dst, vlan));
1677 }
1678
1679 static int
bridge_ioctl_flush(struct bridge_softc * sc,void * arg)1680 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1681 {
1682 struct ifbreq *req = arg;
1683
1684 BRIDGE_RT_LOCK(sc);
1685 bridge_rtflush(sc, req->ifbr_ifsflags);
1686 BRIDGE_RT_UNLOCK(sc);
1687
1688 return (0);
1689 }
1690
1691 static int
bridge_ioctl_gpri(struct bridge_softc * sc,void * arg)1692 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1693 {
1694 struct ifbrparam *param = arg;
1695 struct bstp_state *bs = &sc->sc_stp;
1696
1697 param->ifbrp_prio = bs->bs_bridge_priority;
1698 return (0);
1699 }
1700
1701 static int
bridge_ioctl_spri(struct bridge_softc * sc,void * arg)1702 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1703 {
1704 struct ifbrparam *param = arg;
1705
1706 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1707 }
1708
1709 static int
bridge_ioctl_ght(struct bridge_softc * sc,void * arg)1710 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1711 {
1712 struct ifbrparam *param = arg;
1713 struct bstp_state *bs = &sc->sc_stp;
1714
1715 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1716 return (0);
1717 }
1718
1719 static int
bridge_ioctl_sht(struct bridge_softc * sc,void * arg)1720 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1721 {
1722 struct ifbrparam *param = arg;
1723
1724 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1725 }
1726
1727 static int
bridge_ioctl_gfd(struct bridge_softc * sc,void * arg)1728 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1729 {
1730 struct ifbrparam *param = arg;
1731 struct bstp_state *bs = &sc->sc_stp;
1732
1733 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1734 return (0);
1735 }
1736
1737 static int
bridge_ioctl_sfd(struct bridge_softc * sc,void * arg)1738 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1739 {
1740 struct ifbrparam *param = arg;
1741
1742 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1743 }
1744
1745 static int
bridge_ioctl_gma(struct bridge_softc * sc,void * arg)1746 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1747 {
1748 struct ifbrparam *param = arg;
1749 struct bstp_state *bs = &sc->sc_stp;
1750
1751 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1752 return (0);
1753 }
1754
1755 static int
bridge_ioctl_sma(struct bridge_softc * sc,void * arg)1756 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1757 {
1758 struct ifbrparam *param = arg;
1759
1760 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1761 }
1762
1763 static int
bridge_ioctl_sifprio(struct bridge_softc * sc,void * arg)1764 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1765 {
1766 struct ifbreq *req = arg;
1767 struct bridge_iflist *bif;
1768
1769 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1770 if (bif == NULL)
1771 return (ENOENT);
1772
1773 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1774 }
1775
1776 static int
bridge_ioctl_sifcost(struct bridge_softc * sc,void * arg)1777 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1778 {
1779 struct ifbreq *req = arg;
1780 struct bridge_iflist *bif;
1781
1782 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1783 if (bif == NULL)
1784 return (ENOENT);
1785
1786 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1787 }
1788
1789 static int
bridge_ioctl_sifmaxaddr(struct bridge_softc * sc,void * arg)1790 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1791 {
1792 struct ifbreq *req = arg;
1793 struct bridge_iflist *bif;
1794
1795 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1796 if (bif == NULL)
1797 return (ENOENT);
1798
1799 bif->bif_addrmax = req->ifbr_addrmax;
1800 return (0);
1801 }
1802
1803 static int
bridge_ioctl_addspan(struct bridge_softc * sc,void * arg)1804 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1805 {
1806 struct ifbreq *req = arg;
1807 struct bridge_iflist *bif = NULL;
1808 struct ifnet *ifs;
1809
1810 ifs = ifunit(req->ifbr_ifsname);
1811 if (ifs == NULL)
1812 return (ENOENT);
1813
1814 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1815 if (ifs == bif->bif_ifp)
1816 return (EBUSY);
1817
1818 if (ifs->if_bridge != NULL)
1819 return (EBUSY);
1820
1821 switch (ifs->if_type) {
1822 case IFT_ETHER:
1823 case IFT_GIF:
1824 case IFT_L2VLAN:
1825 break;
1826 default:
1827 return (EINVAL);
1828 }
1829
1830 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1831 if (bif == NULL)
1832 return (ENOMEM);
1833
1834 bif->bif_ifp = ifs;
1835 bif->bif_flags = IFBIF_SPAN;
1836
1837 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1838
1839 return (0);
1840 }
1841
1842 static int
bridge_ioctl_delspan(struct bridge_softc * sc,void * arg)1843 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1844 {
1845 struct ifbreq *req = arg;
1846 struct bridge_iflist *bif;
1847 struct ifnet *ifs;
1848
1849 ifs = ifunit(req->ifbr_ifsname);
1850 if (ifs == NULL)
1851 return (ENOENT);
1852
1853 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1854 if (ifs == bif->bif_ifp)
1855 break;
1856
1857 if (bif == NULL)
1858 return (ENOENT);
1859
1860 bridge_delete_span(sc, bif);
1861
1862 return (0);
1863 }
1864
1865 static int
bridge_ioctl_gbparam(struct bridge_softc * sc,void * arg)1866 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1867 {
1868 struct ifbropreq *req = arg;
1869 struct bstp_state *bs = &sc->sc_stp;
1870 struct bstp_port *root_port;
1871
1872 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1873 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1874 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1875
1876 root_port = bs->bs_root_port;
1877 if (root_port == NULL)
1878 req->ifbop_root_port = 0;
1879 else
1880 req->ifbop_root_port = root_port->bp_ifp->if_index;
1881
1882 req->ifbop_holdcount = bs->bs_txholdcount;
1883 req->ifbop_priority = bs->bs_bridge_priority;
1884 req->ifbop_protocol = bs->bs_protover;
1885 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1886 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1887 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1888 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1889 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1890 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1891
1892 return (0);
1893 }
1894
1895 static int
bridge_ioctl_grte(struct bridge_softc * sc,void * arg)1896 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1897 {
1898 struct ifbrparam *param = arg;
1899
1900 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1901 return (0);
1902 }
1903
1904 static int
bridge_ioctl_gifsstp(struct bridge_softc * sc,void * arg)1905 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1906 {
1907 struct ifbpstpconf *bifstp = arg;
1908 struct bridge_iflist *bif;
1909 struct bstp_port *bp;
1910 struct ifbpstpreq bpreq;
1911 char *buf, *outbuf;
1912 int count, buflen, len, error = 0;
1913
1914 count = 0;
1915 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1916 if ((bif->bif_flags & IFBIF_STP) != 0)
1917 count++;
1918 }
1919
1920 buflen = sizeof(bpreq) * count;
1921 if (bifstp->ifbpstp_len == 0) {
1922 bifstp->ifbpstp_len = buflen;
1923 return (0);
1924 }
1925
1926 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1927 if (outbuf == NULL)
1928 return (ENOMEM);
1929
1930 count = 0;
1931 buf = outbuf;
1932 len = min(bifstp->ifbpstp_len, buflen);
1933 bzero(&bpreq, sizeof(bpreq));
1934 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1935 if (len < sizeof(bpreq))
1936 break;
1937
1938 if ((bif->bif_flags & IFBIF_STP) == 0)
1939 continue;
1940
1941 bp = &bif->bif_stp;
1942 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1943 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1944 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1945 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1946 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1947 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1948
1949 memcpy(buf, &bpreq, sizeof(bpreq));
1950 count++;
1951 buf += sizeof(bpreq);
1952 len -= sizeof(bpreq);
1953 }
1954
1955 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1956 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1957 free(outbuf, M_TEMP);
1958 return (error);
1959 }
1960
1961 static int
bridge_ioctl_sproto(struct bridge_softc * sc,void * arg)1962 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1963 {
1964 struct ifbrparam *param = arg;
1965
1966 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1967 }
1968
1969 static int
bridge_ioctl_stxhc(struct bridge_softc * sc,void * arg)1970 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1971 {
1972 struct ifbrparam *param = arg;
1973
1974 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1975 }
1976
1977 /*
1978 * bridge_ifdetach:
1979 *
1980 * Detach an interface from a bridge. Called when a member
1981 * interface is detaching.
1982 */
1983 static void
bridge_ifdetach(void * arg __unused,struct ifnet * ifp)1984 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1985 {
1986 struct bridge_softc *sc = ifp->if_bridge;
1987 struct bridge_iflist *bif;
1988
1989 if (ifp->if_flags & IFF_RENAMING)
1990 return;
1991 if (V_bridge_cloner == NULL) {
1992 /*
1993 * This detach handler can be called after
1994 * vnet_bridge_uninit(). Just return in that case.
1995 */
1996 return;
1997 }
1998 /* Check if the interface is a bridge member */
1999 if (sc != NULL) {
2000 BRIDGE_LOCK(sc);
2001
2002 bif = bridge_lookup_member_if(sc, ifp);
2003 if (bif != NULL)
2004 bridge_delete_member(sc, bif, 1);
2005
2006 BRIDGE_UNLOCK(sc);
2007 return;
2008 }
2009
2010 /* Check if the interface is a span port */
2011 BRIDGE_LIST_LOCK();
2012 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
2013 BRIDGE_LOCK(sc);
2014 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
2015 if (ifp == bif->bif_ifp) {
2016 bridge_delete_span(sc, bif);
2017 break;
2018 }
2019
2020 BRIDGE_UNLOCK(sc);
2021 }
2022 BRIDGE_LIST_UNLOCK();
2023 }
2024
2025 /*
2026 * bridge_init:
2027 *
2028 * Initialize a bridge interface.
2029 */
2030 static void
bridge_init(void * xsc)2031 bridge_init(void *xsc)
2032 {
2033 struct bridge_softc *sc = (struct bridge_softc *)xsc;
2034 struct ifnet *ifp = sc->sc_ifp;
2035
2036 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
2037 return;
2038
2039 BRIDGE_LOCK(sc);
2040 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
2041 bridge_timer, sc);
2042
2043 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2044 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
2045
2046 BRIDGE_UNLOCK(sc);
2047 }
2048
2049 /*
2050 * bridge_stop:
2051 *
2052 * Stop the bridge interface.
2053 */
2054 static void
bridge_stop(struct ifnet * ifp,int disable)2055 bridge_stop(struct ifnet *ifp, int disable)
2056 {
2057 struct bridge_softc *sc = ifp->if_softc;
2058
2059 BRIDGE_LOCK_ASSERT(sc);
2060
2061 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2062 return;
2063
2064 BRIDGE_RT_LOCK(sc);
2065 callout_stop(&sc->sc_brcallout);
2066
2067 bstp_stop(&sc->sc_stp);
2068
2069 bridge_rtflush(sc, IFBF_FLUSHDYN);
2070 BRIDGE_RT_UNLOCK(sc);
2071
2072 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2073 }
2074
2075 /*
2076 * bridge_enqueue:
2077 *
2078 * Enqueue a packet on a bridge member interface.
2079 *
2080 */
2081 static int
bridge_enqueue(struct bridge_softc * sc,struct ifnet * dst_ifp,struct mbuf * m)2082 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
2083 {
2084 int len, err = 0;
2085 short mflags;
2086 struct mbuf *m0;
2087
2088 /* We may be sending a fragment so traverse the mbuf */
2089 for (; m; m = m0) {
2090 m0 = m->m_nextpkt;
2091 m->m_nextpkt = NULL;
2092 len = m->m_pkthdr.len;
2093 mflags = m->m_flags;
2094
2095 /*
2096 * If underlying interface can not do VLAN tag insertion itself
2097 * then attach a packet tag that holds it.
2098 */
2099 if ((m->m_flags & M_VLANTAG) &&
2100 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
2101 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2102 if (m == NULL) {
2103 if_printf(dst_ifp,
2104 "unable to prepend VLAN header\n");
2105 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
2106 continue;
2107 }
2108 m->m_flags &= ~M_VLANTAG;
2109 }
2110
2111 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
2112 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
2113 int n;
2114
2115 for (m = m0, n = 1; m != NULL; m = m0, n++) {
2116 m0 = m->m_nextpkt;
2117 m_freem(m);
2118 }
2119 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n);
2120 break;
2121 }
2122
2123 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2124 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2125 if (mflags & M_MCAST)
2126 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2127 }
2128
2129 return (err);
2130 }
2131
2132 /*
2133 * bridge_dummynet:
2134 *
2135 * Receive a queued packet from dummynet and pass it on to the output
2136 * interface.
2137 *
2138 * The mbuf has the Ethernet header already attached.
2139 */
2140 static void
bridge_dummynet(struct mbuf * m,struct ifnet * ifp)2141 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2142 {
2143 struct bridge_softc *sc;
2144
2145 sc = ifp->if_bridge;
2146
2147 /*
2148 * The packet didnt originate from a member interface. This should only
2149 * ever happen if a member interface is removed while packets are
2150 * queued for it.
2151 */
2152 if (sc == NULL) {
2153 m_freem(m);
2154 return;
2155 }
2156
2157 if (PFIL_HOOKED_OUT_46) {
2158 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2159 return;
2160 if (m == NULL)
2161 return;
2162 }
2163
2164 bridge_enqueue(sc, ifp, m);
2165 }
2166
2167 /*
2168 * bridge_output:
2169 *
2170 * Send output from a bridge member interface. This
2171 * performs the bridging function for locally originated
2172 * packets.
2173 *
2174 * The mbuf has the Ethernet header already attached. We must
2175 * enqueue or free the mbuf before returning.
2176 */
2177 static int
bridge_output(struct ifnet * ifp,struct mbuf * m,struct sockaddr * sa,struct rtentry * rt)2178 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2179 struct rtentry *rt)
2180 {
2181 struct ether_header *eh;
2182 struct ifnet *bifp, *dst_if;
2183 struct bridge_softc *sc;
2184 uint16_t vlan;
2185
2186 NET_EPOCH_ASSERT();
2187
2188 if (m->m_len < ETHER_HDR_LEN) {
2189 m = m_pullup(m, ETHER_HDR_LEN);
2190 if (m == NULL)
2191 return (0);
2192 }
2193
2194 eh = mtod(m, struct ether_header *);
2195 sc = ifp->if_bridge;
2196 vlan = VLANTAGOF(m);
2197
2198 bifp = sc->sc_ifp;
2199
2200 /*
2201 * If bridge is down, but the original output interface is up,
2202 * go ahead and send out that interface. Otherwise, the packet
2203 * is dropped below.
2204 */
2205 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2206 dst_if = ifp;
2207 goto sendunicast;
2208 }
2209
2210 /*
2211 * If the packet is a multicast, or we don't know a better way to
2212 * get there, send to all interfaces.
2213 */
2214 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2215 dst_if = NULL;
2216 else
2217 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2218 /* Tap any traffic not passing back out the originating interface */
2219 if (dst_if != ifp)
2220 ETHER_BPF_MTAP(bifp, m);
2221 if (dst_if == NULL) {
2222 struct bridge_iflist *bif;
2223 struct mbuf *mc;
2224 int used = 0;
2225
2226 bridge_span(sc, m);
2227
2228 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2229 dst_if = bif->bif_ifp;
2230
2231 if (dst_if->if_type == IFT_GIF)
2232 continue;
2233 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2234 continue;
2235
2236 /*
2237 * If this is not the original output interface,
2238 * and the interface is participating in spanning
2239 * tree, make sure the port is in a state that
2240 * allows forwarding.
2241 */
2242 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2243 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2244 continue;
2245
2246 if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2247 used = 1;
2248 mc = m;
2249 } else {
2250 mc = m_dup(m, M_NOWAIT);
2251 if (mc == NULL) {
2252 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2253 continue;
2254 }
2255 }
2256
2257 bridge_enqueue(sc, dst_if, mc);
2258 }
2259 if (used == 0)
2260 m_freem(m);
2261 return (0);
2262 }
2263
2264 sendunicast:
2265 /*
2266 * XXX Spanning tree consideration here?
2267 */
2268
2269 bridge_span(sc, m);
2270 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2271 m_freem(m);
2272 return (0);
2273 }
2274
2275 bridge_enqueue(sc, dst_if, m);
2276 return (0);
2277 }
2278
2279 /*
2280 * bridge_transmit:
2281 *
2282 * Do output on a bridge.
2283 *
2284 */
2285 static int
bridge_transmit(struct ifnet * ifp,struct mbuf * m)2286 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2287 {
2288 struct bridge_softc *sc;
2289 struct ether_header *eh;
2290 struct ifnet *dst_if;
2291 int error = 0;
2292
2293 sc = ifp->if_softc;
2294
2295 ETHER_BPF_MTAP(ifp, m);
2296
2297 eh = mtod(m, struct ether_header *);
2298
2299 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2300 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, DOT1Q_VID_NULL)) !=
2301 NULL) {
2302 error = bridge_enqueue(sc, dst_if, m);
2303 } else
2304 bridge_broadcast(sc, ifp, m, 0);
2305
2306 return (error);
2307 }
2308
2309 #ifdef ALTQ
2310 static void
bridge_altq_start(if_t ifp)2311 bridge_altq_start(if_t ifp)
2312 {
2313 struct ifaltq *ifq = &ifp->if_snd;
2314 struct mbuf *m;
2315
2316 IFQ_LOCK(ifq);
2317 IFQ_DEQUEUE_NOLOCK(ifq, m);
2318 while (m != NULL) {
2319 bridge_transmit(ifp, m);
2320 IFQ_DEQUEUE_NOLOCK(ifq, m);
2321 }
2322 IFQ_UNLOCK(ifq);
2323 }
2324
2325 static int
bridge_altq_transmit(if_t ifp,struct mbuf * m)2326 bridge_altq_transmit(if_t ifp, struct mbuf *m)
2327 {
2328 int err;
2329
2330 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
2331 IFQ_ENQUEUE(&ifp->if_snd, m, err);
2332 if (err == 0)
2333 bridge_altq_start(ifp);
2334 } else
2335 err = bridge_transmit(ifp, m);
2336
2337 return (err);
2338 }
2339 #endif /* ALTQ */
2340
2341 /*
2342 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2343 */
2344 static void
bridge_qflush(struct ifnet * ifp __unused)2345 bridge_qflush(struct ifnet *ifp __unused)
2346 {
2347 }
2348
2349 /*
2350 * bridge_forward:
2351 *
2352 * The forwarding function of the bridge.
2353 *
2354 * NOTE: Releases the lock on return.
2355 */
2356 static void
bridge_forward(struct bridge_softc * sc,struct bridge_iflist * sbif,struct mbuf * m)2357 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2358 struct mbuf *m)
2359 {
2360 struct bridge_iflist *dbif;
2361 struct ifnet *src_if, *dst_if, *ifp;
2362 struct ether_header *eh;
2363 uint16_t vlan;
2364 uint8_t *dst;
2365 int error;
2366
2367 NET_EPOCH_ASSERT();
2368
2369 src_if = m->m_pkthdr.rcvif;
2370 ifp = sc->sc_ifp;
2371
2372 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2373 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2374 vlan = VLANTAGOF(m);
2375
2376 if ((sbif->bif_flags & IFBIF_STP) &&
2377 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2378 goto drop;
2379
2380 eh = mtod(m, struct ether_header *);
2381 dst = eh->ether_dhost;
2382
2383 /* If the interface is learning, record the address. */
2384 if (sbif->bif_flags & IFBIF_LEARNING) {
2385 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2386 sbif, 0, IFBAF_DYNAMIC);
2387 /*
2388 * If the interface has addresses limits then deny any source
2389 * that is not in the cache.
2390 */
2391 if (error && sbif->bif_addrmax)
2392 goto drop;
2393 }
2394
2395 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2396 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2397 goto drop;
2398
2399 #ifdef DEV_NETMAP
2400 /*
2401 * Hand the packet to netmap only if it wasn't injected by netmap
2402 * itself.
2403 */
2404 if ((m->m_flags & M_BRIDGE_INJECT) == 0 &&
2405 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) {
2406 ifp->if_input(ifp, m);
2407 return;
2408 }
2409 m->m_flags &= ~M_BRIDGE_INJECT;
2410 #endif
2411
2412 /*
2413 * At this point, the port either doesn't participate
2414 * in spanning tree or it is in the forwarding state.
2415 */
2416
2417 /*
2418 * If the packet is unicast, destined for someone on
2419 * "this" side of the bridge, drop it.
2420 */
2421 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2422 dst_if = bridge_rtlookup(sc, dst, vlan);
2423 if (src_if == dst_if)
2424 goto drop;
2425 } else {
2426 /*
2427 * Check if its a reserved multicast address, any address
2428 * listed in 802.1D section 7.12.6 may not be forwarded by the
2429 * bridge.
2430 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2431 */
2432 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2433 dst[2] == 0xc2 && dst[3] == 0x00 &&
2434 dst[4] == 0x00 && dst[5] <= 0x0f)
2435 goto drop;
2436
2437 /* ...forward it to all interfaces. */
2438 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2439 dst_if = NULL;
2440 }
2441
2442 /*
2443 * If we have a destination interface which is a member of our bridge,
2444 * OR this is a unicast packet, push it through the bpf(4) machinery.
2445 * For broadcast or multicast packets, don't bother because it will
2446 * be reinjected into ether_input. We do this before we pass the packets
2447 * through the pfil(9) framework, as it is possible that pfil(9) will
2448 * drop the packet, or possibly modify it, making it difficult to debug
2449 * firewall issues on the bridge.
2450 */
2451 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2452 ETHER_BPF_MTAP(ifp, m);
2453
2454 /* run the packet filter */
2455 if (PFIL_HOOKED_IN_46) {
2456 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2457 return;
2458 if (m == NULL)
2459 return;
2460 }
2461
2462 if (dst_if == NULL) {
2463 bridge_broadcast(sc, src_if, m, 1);
2464 return;
2465 }
2466
2467 /*
2468 * At this point, we're dealing with a unicast frame
2469 * going to a different interface.
2470 */
2471 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2472 goto drop;
2473
2474 dbif = bridge_lookup_member_if(sc, dst_if);
2475 if (dbif == NULL)
2476 /* Not a member of the bridge (anymore?) */
2477 goto drop;
2478
2479 /* Private segments can not talk to each other */
2480 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2481 goto drop;
2482
2483 if ((dbif->bif_flags & IFBIF_STP) &&
2484 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2485 goto drop;
2486
2487 if (PFIL_HOOKED_OUT_46) {
2488 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2489 return;
2490 if (m == NULL)
2491 return;
2492 }
2493
2494 bridge_enqueue(sc, dst_if, m);
2495 return;
2496
2497 drop:
2498 m_freem(m);
2499 }
2500
2501 /*
2502 * bridge_input:
2503 *
2504 * Receive input from a member interface. Queue the packet for
2505 * bridging if it is not for us.
2506 */
2507 static struct mbuf *
bridge_input(struct ifnet * ifp,struct mbuf * m)2508 bridge_input(struct ifnet *ifp, struct mbuf *m)
2509 {
2510 struct bridge_softc *sc;
2511 struct bridge_iflist *bif, *bif2;
2512 struct ifnet *bifp;
2513 struct ether_header *eh;
2514 struct mbuf *mc, *mc2;
2515 uint16_t vlan;
2516 int error;
2517
2518 NET_EPOCH_ASSERT();
2519
2520 eh = mtod(m, struct ether_header *);
2521 vlan = VLANTAGOF(m);
2522
2523 sc = ifp->if_bridge;
2524 if (sc == NULL) {
2525 /*
2526 * This packet originated from the bridge itself, so it must
2527 * have been transmitted by netmap. Derive the "source"
2528 * interface from the source address and drop the packet if the
2529 * source address isn't known.
2530 */
2531 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0,
2532 ("%s: ifnet %p missing a bridge softc", __func__, ifp));
2533 sc = if_getsoftc(ifp);
2534 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan);
2535 if (ifp == NULL) {
2536 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1);
2537 m_freem(m);
2538 return (NULL);
2539 }
2540 m->m_pkthdr.rcvif = ifp;
2541 }
2542 bifp = sc->sc_ifp;
2543 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2544 return (m);
2545
2546 /*
2547 * Implement support for bridge monitoring. If this flag has been
2548 * set on this interface, discard the packet once we push it through
2549 * the bpf(4) machinery, but before we do, increment the byte and
2550 * packet counters associated with this interface.
2551 */
2552 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2553 m->m_pkthdr.rcvif = bifp;
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 m_freem(m);
2558 return (NULL);
2559 }
2560 bif = bridge_lookup_member_if(sc, ifp);
2561 if (bif == NULL) {
2562 return (m);
2563 }
2564
2565 bridge_span(sc, m);
2566
2567 if (m->m_flags & (M_BCAST|M_MCAST)) {
2568 /* Tap off 802.1D packets; they do not get forwarded. */
2569 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2570 ETHER_ADDR_LEN) == 0) {
2571 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2572 return (NULL);
2573 }
2574
2575 if ((bif->bif_flags & IFBIF_STP) &&
2576 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2577 return (m);
2578 }
2579
2580 /*
2581 * Make a deep copy of the packet and enqueue the copy
2582 * for bridge processing; return the original packet for
2583 * local processing.
2584 */
2585 mc = m_dup(m, M_NOWAIT);
2586 if (mc == NULL) {
2587 return (m);
2588 }
2589
2590 /* Perform the bridge forwarding function with the copy. */
2591 bridge_forward(sc, bif, mc);
2592
2593 #ifdef DEV_NETMAP
2594 /*
2595 * If netmap is enabled and has not already seen this packet,
2596 * then it will be consumed by bridge_forward().
2597 */
2598 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 &&
2599 (m->m_flags & M_BRIDGE_INJECT) == 0) {
2600 m_freem(m);
2601 return (NULL);
2602 }
2603 #endif
2604
2605 /*
2606 * Reinject the mbuf as arriving on the bridge so we have a
2607 * chance at claiming multicast packets. We can not loop back
2608 * here from ether_input as a bridge is never a member of a
2609 * bridge.
2610 */
2611 KASSERT(bifp->if_bridge == NULL,
2612 ("loop created in bridge_input"));
2613 mc2 = m_dup(m, M_NOWAIT);
2614 if (mc2 != NULL) {
2615 /* Keep the layer3 header aligned */
2616 int i = min(mc2->m_pkthdr.len, max_protohdr);
2617 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2618 }
2619 if (mc2 != NULL) {
2620 mc2->m_pkthdr.rcvif = bifp;
2621 mc2->m_flags &= ~M_BRIDGE_INJECT;
2622 sc->sc_if_input(bifp, mc2);
2623 }
2624
2625 /* Return the original packet for local processing. */
2626 return (m);
2627 }
2628
2629 if ((bif->bif_flags & IFBIF_STP) &&
2630 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2631 return (m);
2632 }
2633
2634 #if defined(INET) || defined(INET6)
2635 #define CARP_CHECK_WE_ARE_DST(iface) \
2636 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost))
2637 #define CARP_CHECK_WE_ARE_SRC(iface) \
2638 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost))
2639 #else
2640 #define CARP_CHECK_WE_ARE_DST(iface) false
2641 #define CARP_CHECK_WE_ARE_SRC(iface) false
2642 #endif
2643
2644 #ifdef DEV_NETMAP
2645 #define GRAB_FOR_NETMAP(ifp, m) do { \
2646 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \
2647 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \
2648 (ifp)->if_input(ifp, m); \
2649 return (NULL); \
2650 } \
2651 } while (0)
2652 #else
2653 #define GRAB_FOR_NETMAP(ifp, m)
2654 #endif
2655
2656 #define GRAB_OUR_PACKETS(iface) \
2657 if ((iface)->if_type == IFT_GIF) \
2658 continue; \
2659 /* It is destined for us. */ \
2660 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \
2661 CARP_CHECK_WE_ARE_DST(iface)) { \
2662 if (bif->bif_flags & IFBIF_LEARNING) { \
2663 error = bridge_rtupdate(sc, eh->ether_shost, \
2664 vlan, bif, 0, IFBAF_DYNAMIC); \
2665 if (error && bif->bif_addrmax) { \
2666 m_freem(m); \
2667 return (NULL); \
2668 } \
2669 } \
2670 m->m_pkthdr.rcvif = iface; \
2671 if ((iface) == ifp) { \
2672 /* Skip bridge processing... src == dest */ \
2673 return (m); \
2674 } \
2675 /* It's passing over or to the bridge, locally. */ \
2676 ETHER_BPF_MTAP(bifp, m); \
2677 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \
2678 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\
2679 /* Hand the packet over to netmap if necessary. */ \
2680 GRAB_FOR_NETMAP(bifp, m); \
2681 /* Filter on the physical interface. */ \
2682 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \
2683 if (bridge_pfil(&m, NULL, ifp, \
2684 PFIL_IN) != 0 || m == NULL) { \
2685 return (NULL); \
2686 } \
2687 } \
2688 if ((iface) != bifp) \
2689 ETHER_BPF_MTAP(iface, m); \
2690 return (m); \
2691 } \
2692 \
2693 /* We just received a packet that we sent out. */ \
2694 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \
2695 CARP_CHECK_WE_ARE_SRC(iface)) { \
2696 m_freem(m); \
2697 return (NULL); \
2698 }
2699
2700 /*
2701 * Unicast. Make sure it's not for the bridge.
2702 */
2703 do { GRAB_OUR_PACKETS(bifp) } while (0);
2704
2705 /*
2706 * Give a chance for ifp at first priority. This will help when the
2707 * packet comes through the interface like VLAN's with the same MACs
2708 * on several interfaces from the same bridge. This also will save
2709 * some CPU cycles in case the destination interface and the input
2710 * interface (eq ifp) are the same.
2711 */
2712 do { GRAB_OUR_PACKETS(ifp) } while (0);
2713
2714 /* Now check the all bridge members. */
2715 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2716 GRAB_OUR_PACKETS(bif2->bif_ifp)
2717 }
2718
2719 #undef CARP_CHECK_WE_ARE_DST
2720 #undef CARP_CHECK_WE_ARE_SRC
2721 #undef GRAB_FOR_NETMAP
2722 #undef GRAB_OUR_PACKETS
2723
2724 /* Perform the bridge forwarding function. */
2725 bridge_forward(sc, bif, m);
2726
2727 return (NULL);
2728 }
2729
2730 /*
2731 * Inject a packet back into the host ethernet stack. This will generally only
2732 * be used by netmap when an application writes to the host TX ring. The
2733 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge
2734 * interface after ethernet processing.
2735 */
2736 static void
bridge_inject(struct ifnet * ifp,struct mbuf * m)2737 bridge_inject(struct ifnet *ifp, struct mbuf *m)
2738 {
2739 struct bridge_softc *sc;
2740
2741 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0,
2742 ("%s: iface %s is not running in netmap mode",
2743 __func__, if_name(ifp)));
2744 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0,
2745 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m));
2746
2747 m->m_flags |= M_BRIDGE_INJECT;
2748 sc = if_getsoftc(ifp);
2749 sc->sc_if_input(ifp, m);
2750 }
2751
2752 /*
2753 * bridge_broadcast:
2754 *
2755 * Send a frame to all interfaces that are members of
2756 * the bridge, except for the one on which the packet
2757 * arrived.
2758 *
2759 * NOTE: Releases the lock on return.
2760 */
2761 static void
bridge_broadcast(struct bridge_softc * sc,struct ifnet * src_if,struct mbuf * m,int runfilt)2762 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2763 struct mbuf *m, int runfilt)
2764 {
2765 struct bridge_iflist *dbif, *sbif;
2766 struct mbuf *mc;
2767 struct ifnet *dst_if;
2768 int used = 0, i;
2769
2770 NET_EPOCH_ASSERT();
2771
2772 sbif = bridge_lookup_member_if(sc, src_if);
2773
2774 /* Filter on the bridge interface before broadcasting */
2775 if (runfilt && PFIL_HOOKED_OUT_46) {
2776 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2777 return;
2778 if (m == NULL)
2779 return;
2780 }
2781
2782 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2783 dst_if = dbif->bif_ifp;
2784 if (dst_if == src_if)
2785 continue;
2786
2787 /* Private segments can not talk to each other */
2788 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2789 continue;
2790
2791 if ((dbif->bif_flags & IFBIF_STP) &&
2792 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2793 continue;
2794
2795 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2796 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2797 continue;
2798
2799 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2800 continue;
2801
2802 if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
2803 mc = m;
2804 used = 1;
2805 } else {
2806 mc = m_dup(m, M_NOWAIT);
2807 if (mc == NULL) {
2808 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2809 continue;
2810 }
2811 }
2812
2813 /*
2814 * Filter on the output interface. Pass a NULL bridge interface
2815 * pointer so we do not redundantly filter on the bridge for
2816 * each interface we broadcast on.
2817 */
2818 if (runfilt && PFIL_HOOKED_OUT_46) {
2819 if (used == 0) {
2820 /* Keep the layer3 header aligned */
2821 i = min(mc->m_pkthdr.len, max_protohdr);
2822 mc = m_copyup(mc, i, ETHER_ALIGN);
2823 if (mc == NULL) {
2824 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2825 continue;
2826 }
2827 }
2828 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2829 continue;
2830 if (mc == NULL)
2831 continue;
2832 }
2833
2834 bridge_enqueue(sc, dst_if, mc);
2835 }
2836 if (used == 0)
2837 m_freem(m);
2838 }
2839
2840 /*
2841 * bridge_span:
2842 *
2843 * Duplicate a packet out one or more interfaces that are in span mode,
2844 * the original mbuf is unmodified.
2845 */
2846 static void
bridge_span(struct bridge_softc * sc,struct mbuf * m)2847 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2848 {
2849 struct bridge_iflist *bif;
2850 struct ifnet *dst_if;
2851 struct mbuf *mc;
2852
2853 NET_EPOCH_ASSERT();
2854
2855 if (CK_LIST_EMPTY(&sc->sc_spanlist))
2856 return;
2857
2858 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2859 dst_if = bif->bif_ifp;
2860
2861 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2862 continue;
2863
2864 mc = m_dup(m, M_NOWAIT);
2865 if (mc == NULL) {
2866 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2867 continue;
2868 }
2869
2870 bridge_enqueue(sc, dst_if, mc);
2871 }
2872 }
2873
2874 /*
2875 * bridge_rtupdate:
2876 *
2877 * Add a bridge routing entry.
2878 */
2879 static int
bridge_rtupdate(struct bridge_softc * sc,const uint8_t * dst,uint16_t vlan,struct bridge_iflist * bif,int setflags,uint8_t flags)2880 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2881 struct bridge_iflist *bif, int setflags, uint8_t flags)
2882 {
2883 struct bridge_rtnode *brt;
2884 struct bridge_iflist *obif;
2885 int error;
2886
2887 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
2888
2889 /* Check the source address is valid and not multicast. */
2890 if (ETHER_IS_MULTICAST(dst) ||
2891 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2892 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2893 return (EINVAL);
2894
2895 /*
2896 * A route for this destination might already exist. If so,
2897 * update it, otherwise create a new one.
2898 */
2899 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2900 BRIDGE_RT_LOCK(sc);
2901
2902 /* Check again, now that we have the lock. There could have
2903 * been a race and we only want to insert this once. */
2904 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) {
2905 BRIDGE_RT_UNLOCK(sc);
2906 return (0);
2907 }
2908
2909 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2910 sc->sc_brtexceeded++;
2911 BRIDGE_RT_UNLOCK(sc);
2912 return (ENOSPC);
2913 }
2914 /* Check per interface address limits (if enabled) */
2915 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2916 bif->bif_addrexceeded++;
2917 BRIDGE_RT_UNLOCK(sc);
2918 return (ENOSPC);
2919 }
2920
2921 /*
2922 * Allocate a new bridge forwarding node, and
2923 * initialize the expiration time and Ethernet
2924 * address.
2925 */
2926 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2927 if (brt == NULL) {
2928 BRIDGE_RT_UNLOCK(sc);
2929 return (ENOMEM);
2930 }
2931 brt->brt_vnet = curvnet;
2932
2933 if (bif->bif_flags & IFBIF_STICKY)
2934 brt->brt_flags = IFBAF_STICKY;
2935 else
2936 brt->brt_flags = IFBAF_DYNAMIC;
2937
2938 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2939 brt->brt_vlan = vlan;
2940
2941 brt->brt_dst = bif;
2942 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2943 uma_zfree(V_bridge_rtnode_zone, brt);
2944 BRIDGE_RT_UNLOCK(sc);
2945 return (error);
2946 }
2947 bif->bif_addrcnt++;
2948
2949 BRIDGE_RT_UNLOCK(sc);
2950 }
2951
2952 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2953 (obif = brt->brt_dst) != bif) {
2954 MPASS(obif != NULL);
2955
2956 BRIDGE_RT_LOCK(sc);
2957 brt->brt_dst->bif_addrcnt--;
2958 brt->brt_dst = bif;
2959 brt->brt_dst->bif_addrcnt++;
2960 BRIDGE_RT_UNLOCK(sc);
2961
2962 if (V_log_mac_flap &&
2963 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) {
2964 log(LOG_NOTICE,
2965 "%s: mac address %6D vlan %d moved from %s to %s\n",
2966 sc->sc_ifp->if_xname,
2967 &brt->brt_addr[0], ":",
2968 brt->brt_vlan,
2969 obif->bif_ifp->if_xname,
2970 bif->bif_ifp->if_xname);
2971 }
2972 }
2973
2974 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2975 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2976 if (setflags)
2977 brt->brt_flags = flags;
2978
2979 return (0);
2980 }
2981
2982 /*
2983 * bridge_rtlookup:
2984 *
2985 * Lookup the destination interface for an address.
2986 */
2987 static struct ifnet *
bridge_rtlookup(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)2988 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2989 {
2990 struct bridge_rtnode *brt;
2991
2992 NET_EPOCH_ASSERT();
2993
2994 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2995 return (NULL);
2996
2997 return (brt->brt_ifp);
2998 }
2999
3000 /*
3001 * bridge_rttrim:
3002 *
3003 * Trim the routine table so that we have a number
3004 * of routing entries less than or equal to the
3005 * maximum number.
3006 */
3007 static void
bridge_rttrim(struct bridge_softc * sc)3008 bridge_rttrim(struct bridge_softc *sc)
3009 {
3010 struct bridge_rtnode *brt, *nbrt;
3011
3012 NET_EPOCH_ASSERT();
3013 BRIDGE_RT_LOCK_ASSERT(sc);
3014
3015 /* Make sure we actually need to do this. */
3016 if (sc->sc_brtcnt <= sc->sc_brtmax)
3017 return;
3018
3019 /* Force an aging cycle; this might trim enough addresses. */
3020 bridge_rtage(sc);
3021 if (sc->sc_brtcnt <= sc->sc_brtmax)
3022 return;
3023
3024 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3025 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
3026 bridge_rtnode_destroy(sc, brt);
3027 if (sc->sc_brtcnt <= sc->sc_brtmax)
3028 return;
3029 }
3030 }
3031 }
3032
3033 /*
3034 * bridge_timer:
3035 *
3036 * Aging timer for the bridge.
3037 */
3038 static void
bridge_timer(void * arg)3039 bridge_timer(void *arg)
3040 {
3041 struct bridge_softc *sc = arg;
3042
3043 BRIDGE_RT_LOCK_ASSERT(sc);
3044
3045 /* Destruction of rtnodes requires a proper vnet context */
3046 CURVNET_SET(sc->sc_ifp->if_vnet);
3047 bridge_rtage(sc);
3048
3049 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
3050 callout_reset(&sc->sc_brcallout,
3051 bridge_rtable_prune_period * hz, bridge_timer, sc);
3052 CURVNET_RESTORE();
3053 }
3054
3055 /*
3056 * bridge_rtage:
3057 *
3058 * Perform an aging cycle.
3059 */
3060 static void
bridge_rtage(struct bridge_softc * sc)3061 bridge_rtage(struct bridge_softc *sc)
3062 {
3063 struct bridge_rtnode *brt, *nbrt;
3064
3065 BRIDGE_RT_LOCK_ASSERT(sc);
3066
3067 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3068 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
3069 if (time_uptime >= brt->brt_expire)
3070 bridge_rtnode_destroy(sc, brt);
3071 }
3072 }
3073 }
3074
3075 /*
3076 * bridge_rtflush:
3077 *
3078 * Remove all dynamic addresses from the bridge.
3079 */
3080 static void
bridge_rtflush(struct bridge_softc * sc,int full)3081 bridge_rtflush(struct bridge_softc *sc, int full)
3082 {
3083 struct bridge_rtnode *brt, *nbrt;
3084
3085 BRIDGE_RT_LOCK_ASSERT(sc);
3086
3087 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3088 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3089 bridge_rtnode_destroy(sc, brt);
3090 }
3091 }
3092
3093 /*
3094 * bridge_rtdaddr:
3095 *
3096 * Remove an address from the table.
3097 */
3098 static int
bridge_rtdaddr(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)3099 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3100 {
3101 struct bridge_rtnode *brt;
3102 int found = 0;
3103
3104 BRIDGE_RT_LOCK(sc);
3105
3106 /*
3107 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans
3108 * so the lookup may return more than one.
3109 */
3110 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
3111 bridge_rtnode_destroy(sc, brt);
3112 found = 1;
3113 }
3114
3115 BRIDGE_RT_UNLOCK(sc);
3116
3117 return (found ? 0 : ENOENT);
3118 }
3119
3120 /*
3121 * bridge_rtdelete:
3122 *
3123 * Delete routes to a speicifc member interface.
3124 */
3125 static void
bridge_rtdelete(struct bridge_softc * sc,struct ifnet * ifp,int full)3126 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
3127 {
3128 struct bridge_rtnode *brt, *nbrt;
3129
3130 BRIDGE_RT_LOCK_ASSERT(sc);
3131
3132 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3133 if (brt->brt_ifp == ifp && (full ||
3134 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
3135 bridge_rtnode_destroy(sc, brt);
3136 }
3137 }
3138
3139 /*
3140 * bridge_rtable_init:
3141 *
3142 * Initialize the route table for this bridge.
3143 */
3144 static void
bridge_rtable_init(struct bridge_softc * sc)3145 bridge_rtable_init(struct bridge_softc *sc)
3146 {
3147 int i;
3148
3149 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
3150 M_DEVBUF, M_WAITOK);
3151
3152 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3153 CK_LIST_INIT(&sc->sc_rthash[i]);
3154
3155 sc->sc_rthash_key = arc4random();
3156 CK_LIST_INIT(&sc->sc_rtlist);
3157 }
3158
3159 /*
3160 * bridge_rtable_fini:
3161 *
3162 * Deconstruct the route table for this bridge.
3163 */
3164 static void
bridge_rtable_fini(struct bridge_softc * sc)3165 bridge_rtable_fini(struct bridge_softc *sc)
3166 {
3167
3168 KASSERT(sc->sc_brtcnt == 0,
3169 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
3170 free(sc->sc_rthash, M_DEVBUF);
3171 }
3172
3173 /*
3174 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3175 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3176 */
3177 #define mix(a, b, c) \
3178 do { \
3179 a -= b; a -= c; a ^= (c >> 13); \
3180 b -= c; b -= a; b ^= (a << 8); \
3181 c -= a; c -= b; c ^= (b >> 13); \
3182 a -= b; a -= c; a ^= (c >> 12); \
3183 b -= c; b -= a; b ^= (a << 16); \
3184 c -= a; c -= b; c ^= (b >> 5); \
3185 a -= b; a -= c; a ^= (c >> 3); \
3186 b -= c; b -= a; b ^= (a << 10); \
3187 c -= a; c -= b; c ^= (b >> 15); \
3188 } while (/*CONSTCOND*/0)
3189
3190 static __inline uint32_t
bridge_rthash(struct bridge_softc * sc,const uint8_t * addr)3191 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3192 {
3193 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3194
3195 b += addr[5] << 8;
3196 b += addr[4];
3197 a += addr[3] << 24;
3198 a += addr[2] << 16;
3199 a += addr[1] << 8;
3200 a += addr[0];
3201
3202 mix(a, b, c);
3203
3204 return (c & BRIDGE_RTHASH_MASK);
3205 }
3206
3207 #undef mix
3208
3209 static int
bridge_rtnode_addr_cmp(const uint8_t * a,const uint8_t * b)3210 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3211 {
3212 int i, d;
3213
3214 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3215 d = ((int)a[i]) - ((int)b[i]);
3216 }
3217
3218 return (d);
3219 }
3220
3221 /*
3222 * bridge_rtnode_lookup:
3223 *
3224 * Look up a bridge route node for the specified destination. Compare the
3225 * vlan id or if zero then just return the first match.
3226 */
3227 static struct bridge_rtnode *
bridge_rtnode_lookup(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)3228 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3229 {
3230 struct bridge_rtnode *brt;
3231 uint32_t hash;
3232 int dir;
3233
3234 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc);
3235
3236 hash = bridge_rthash(sc, addr);
3237 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3238 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3239 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL))
3240 return (brt);
3241 if (dir > 0)
3242 return (NULL);
3243 }
3244
3245 return (NULL);
3246 }
3247
3248 /*
3249 * bridge_rtnode_insert:
3250 *
3251 * Insert the specified bridge node into the route table. We
3252 * assume the entry is not already in the table.
3253 */
3254 static int
bridge_rtnode_insert(struct bridge_softc * sc,struct bridge_rtnode * brt)3255 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3256 {
3257 struct bridge_rtnode *lbrt;
3258 uint32_t hash;
3259 int dir;
3260
3261 BRIDGE_RT_LOCK_ASSERT(sc);
3262
3263 hash = bridge_rthash(sc, brt->brt_addr);
3264
3265 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3266 if (lbrt == NULL) {
3267 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3268 goto out;
3269 }
3270
3271 do {
3272 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3273 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3274 return (EEXIST);
3275 if (dir > 0) {
3276 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3277 goto out;
3278 }
3279 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3280 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3281 goto out;
3282 }
3283 lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3284 } while (lbrt != NULL);
3285
3286 #ifdef DIAGNOSTIC
3287 panic("bridge_rtnode_insert: impossible");
3288 #endif
3289
3290 out:
3291 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3292 sc->sc_brtcnt++;
3293
3294 return (0);
3295 }
3296
3297 static void
bridge_rtnode_destroy_cb(struct epoch_context * ctx)3298 bridge_rtnode_destroy_cb(struct epoch_context *ctx)
3299 {
3300 struct bridge_rtnode *brt;
3301
3302 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx);
3303
3304 CURVNET_SET(brt->brt_vnet);
3305 uma_zfree(V_bridge_rtnode_zone, brt);
3306 CURVNET_RESTORE();
3307 }
3308
3309 /*
3310 * bridge_rtnode_destroy:
3311 *
3312 * Destroy a bridge rtnode.
3313 */
3314 static void
bridge_rtnode_destroy(struct bridge_softc * sc,struct bridge_rtnode * brt)3315 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3316 {
3317 BRIDGE_RT_LOCK_ASSERT(sc);
3318
3319 CK_LIST_REMOVE(brt, brt_hash);
3320
3321 CK_LIST_REMOVE(brt, brt_list);
3322 sc->sc_brtcnt--;
3323 brt->brt_dst->bif_addrcnt--;
3324
3325 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx);
3326 }
3327
3328 /*
3329 * bridge_rtable_expire:
3330 *
3331 * Set the expiry time for all routes on an interface.
3332 */
3333 static void
bridge_rtable_expire(struct ifnet * ifp,int age)3334 bridge_rtable_expire(struct ifnet *ifp, int age)
3335 {
3336 struct bridge_softc *sc = ifp->if_bridge;
3337 struct bridge_rtnode *brt;
3338
3339 CURVNET_SET(ifp->if_vnet);
3340 BRIDGE_RT_LOCK(sc);
3341
3342 /*
3343 * If the age is zero then flush, otherwise set all the expiry times to
3344 * age for the interface
3345 */
3346 if (age == 0)
3347 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3348 else {
3349 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3350 /* Cap the expiry time to 'age' */
3351 if (brt->brt_ifp == ifp &&
3352 brt->brt_expire > time_uptime + age &&
3353 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3354 brt->brt_expire = time_uptime + age;
3355 }
3356 }
3357 BRIDGE_RT_UNLOCK(sc);
3358 CURVNET_RESTORE();
3359 }
3360
3361 /*
3362 * bridge_state_change:
3363 *
3364 * Callback from the bridgestp code when a port changes states.
3365 */
3366 static void
bridge_state_change(struct ifnet * ifp,int state)3367 bridge_state_change(struct ifnet *ifp, int state)
3368 {
3369 struct bridge_softc *sc = ifp->if_bridge;
3370 static const char *stpstates[] = {
3371 "disabled",
3372 "listening",
3373 "learning",
3374 "forwarding",
3375 "blocking",
3376 "discarding"
3377 };
3378
3379 CURVNET_SET(ifp->if_vnet);
3380 if (V_log_stp)
3381 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3382 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3383 CURVNET_RESTORE();
3384 }
3385
3386 /*
3387 * Send bridge packets through pfil if they are one of the types pfil can deal
3388 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3389 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3390 * that interface.
3391 */
3392 static int
bridge_pfil(struct mbuf ** mp,struct ifnet * bifp,struct ifnet * ifp,int dir)3393 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3394 {
3395 int snap, error, i;
3396 struct ether_header *eh1, eh2;
3397 struct llc llc1;
3398 u_int16_t ether_type;
3399 pfil_return_t rv;
3400 #ifdef INET
3401 struct ip *ip = NULL;
3402 int hlen = 0;
3403 #endif
3404
3405 snap = 0;
3406 error = -1; /* Default error if not error == 0 */
3407
3408 #if 0
3409 /* we may return with the IP fields swapped, ensure its not shared */
3410 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3411 #endif
3412
3413 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3414 return (0); /* filtering is disabled */
3415
3416 i = min((*mp)->m_pkthdr.len, max_protohdr);
3417 if ((*mp)->m_len < i) {
3418 *mp = m_pullup(*mp, i);
3419 if (*mp == NULL) {
3420 printf("%s: m_pullup failed\n", __func__);
3421 return (-1);
3422 }
3423 }
3424
3425 eh1 = mtod(*mp, struct ether_header *);
3426 ether_type = ntohs(eh1->ether_type);
3427
3428 /*
3429 * Check for SNAP/LLC.
3430 */
3431 if (ether_type < ETHERMTU) {
3432 struct llc *llc2 = (struct llc *)(eh1 + 1);
3433
3434 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3435 llc2->llc_dsap == LLC_SNAP_LSAP &&
3436 llc2->llc_ssap == LLC_SNAP_LSAP &&
3437 llc2->llc_control == LLC_UI) {
3438 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3439 snap = 1;
3440 }
3441 }
3442
3443 /*
3444 * If we're trying to filter bridge traffic, only look at traffic for
3445 * protocols available in the kernel (IPv4 and/or IPv6) to avoid
3446 * passing traffic for an unsupported protocol to the filter. This is
3447 * lame since if we really wanted, say, an AppleTalk filter, we are
3448 * hosed, but of course we don't have an AppleTalk filter to begin
3449 * with. (Note that since pfil doesn't understand ARP it will pass
3450 * *ALL* ARP traffic.)
3451 */
3452 switch (ether_type) {
3453 #ifdef INET
3454 case ETHERTYPE_ARP:
3455 case ETHERTYPE_REVARP:
3456 if (V_pfil_ipfw_arp == 0)
3457 return (0); /* Automatically pass */
3458
3459 /* FALLTHROUGH */
3460 case ETHERTYPE_IP:
3461 #endif
3462 #ifdef INET6
3463 case ETHERTYPE_IPV6:
3464 #endif /* INET6 */
3465 break;
3466
3467 default:
3468 /*
3469 * We get here if the packet isn't from a supported
3470 * protocol. Check to see if the user wants to pass
3471 * non-IP packets, these will not be checked by pfil(9)
3472 * and passed unconditionally so the default is to
3473 * drop.
3474 */
3475 if (V_pfil_onlyip)
3476 goto bad;
3477 }
3478
3479 /* Run the packet through pfil before stripping link headers */
3480 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3481 dir == PFIL_OUT && ifp != NULL) {
3482 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) {
3483 case PFIL_DROPPED:
3484 return (EACCES);
3485 case PFIL_CONSUMED:
3486 return (0);
3487 }
3488 }
3489
3490 /* Strip off the Ethernet header and keep a copy. */
3491 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3492 m_adj(*mp, ETHER_HDR_LEN);
3493
3494 /* Strip off snap header, if present */
3495 if (snap) {
3496 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3497 m_adj(*mp, sizeof(struct llc));
3498 }
3499
3500 /*
3501 * Check the IP header for alignment and errors
3502 */
3503 if (dir == PFIL_IN) {
3504 switch (ether_type) {
3505 #ifdef INET
3506 case ETHERTYPE_IP:
3507 error = bridge_ip_checkbasic(mp);
3508 break;
3509 #endif
3510 #ifdef INET6
3511 case ETHERTYPE_IPV6:
3512 error = bridge_ip6_checkbasic(mp);
3513 break;
3514 #endif /* INET6 */
3515 default:
3516 error = 0;
3517 }
3518 if (error)
3519 goto bad;
3520 }
3521
3522 error = 0;
3523
3524 /*
3525 * Run the packet through pfil
3526 */
3527 rv = PFIL_PASS;
3528 switch (ether_type) {
3529 #ifdef INET
3530 case ETHERTYPE_IP:
3531 /*
3532 * Run pfil on the member interface and the bridge, both can
3533 * be skipped by clearing pfil_member or pfil_bridge.
3534 *
3535 * Keep the order:
3536 * in_if -> bridge_if -> out_if
3537 */
3538 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3539 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) !=
3540 PFIL_PASS)
3541 break;
3542
3543 if (V_pfil_member && ifp != NULL) {
3544 rv = (dir == PFIL_OUT) ?
3545 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) :
3546 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL);
3547 if (rv != PFIL_PASS)
3548 break;
3549 }
3550
3551 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3552 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) !=
3553 PFIL_PASS)
3554 break;
3555
3556 /* check if we need to fragment the packet */
3557 /* bridge_fragment generates a mbuf chain of packets */
3558 /* that already include eth headers */
3559 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3560 i = (*mp)->m_pkthdr.len;
3561 if (i > ifp->if_mtu) {
3562 error = bridge_fragment(ifp, mp, &eh2, snap,
3563 &llc1);
3564 return (error);
3565 }
3566 }
3567
3568 /* Recalculate the ip checksum. */
3569 ip = mtod(*mp, struct ip *);
3570 hlen = ip->ip_hl << 2;
3571 if (hlen < sizeof(struct ip))
3572 goto bad;
3573 if (hlen > (*mp)->m_len) {
3574 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3575 goto bad;
3576 ip = mtod(*mp, struct ip *);
3577 if (ip == NULL)
3578 goto bad;
3579 }
3580 ip->ip_sum = 0;
3581 if (hlen == sizeof(struct ip))
3582 ip->ip_sum = in_cksum_hdr(ip);
3583 else
3584 ip->ip_sum = in_cksum(*mp, hlen);
3585
3586 break;
3587 #endif /* INET */
3588 #ifdef INET6
3589 case ETHERTYPE_IPV6:
3590 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3591 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) !=
3592 PFIL_PASS)
3593 break;
3594
3595 if (V_pfil_member && ifp != NULL) {
3596 rv = (dir == PFIL_OUT) ?
3597 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) :
3598 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL);
3599 if (rv != PFIL_PASS)
3600 break;
3601 }
3602
3603 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3604 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) !=
3605 PFIL_PASS)
3606 break;
3607 break;
3608 #endif
3609 }
3610
3611 switch (rv) {
3612 case PFIL_CONSUMED:
3613 return (0);
3614 case PFIL_DROPPED:
3615 return (EACCES);
3616 default:
3617 break;
3618 }
3619
3620 error = -1;
3621
3622 /*
3623 * Finally, put everything back the way it was and return
3624 */
3625 if (snap) {
3626 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3627 if (*mp == NULL)
3628 return (error);
3629 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3630 }
3631
3632 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3633 if (*mp == NULL)
3634 return (error);
3635 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3636
3637 return (0);
3638
3639 bad:
3640 m_freem(*mp);
3641 *mp = NULL;
3642 return (error);
3643 }
3644
3645 #ifdef INET
3646 /*
3647 * Perform basic checks on header size since
3648 * pfil assumes ip_input has already processed
3649 * it for it. Cut-and-pasted from ip_input.c.
3650 * Given how simple the IPv6 version is,
3651 * does the IPv4 version really need to be
3652 * this complicated?
3653 *
3654 * XXX Should we update ipstat here, or not?
3655 * XXX Right now we update ipstat but not
3656 * XXX csum_counter.
3657 */
3658 static int
bridge_ip_checkbasic(struct mbuf ** mp)3659 bridge_ip_checkbasic(struct mbuf **mp)
3660 {
3661 struct mbuf *m = *mp;
3662 struct ip *ip;
3663 int len, hlen;
3664 u_short sum;
3665
3666 if (*mp == NULL)
3667 return (-1);
3668
3669 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3670 if ((m = m_copyup(m, sizeof(struct ip),
3671 (max_linkhdr + 3) & ~3)) == NULL) {
3672 /* XXXJRT new stat, please */
3673 KMOD_IPSTAT_INC(ips_toosmall);
3674 goto bad;
3675 }
3676 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3677 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3678 KMOD_IPSTAT_INC(ips_toosmall);
3679 goto bad;
3680 }
3681 }
3682 ip = mtod(m, struct ip *);
3683 if (ip == NULL) goto bad;
3684
3685 if (ip->ip_v != IPVERSION) {
3686 KMOD_IPSTAT_INC(ips_badvers);
3687 goto bad;
3688 }
3689 hlen = ip->ip_hl << 2;
3690 if (hlen < sizeof(struct ip)) { /* minimum header length */
3691 KMOD_IPSTAT_INC(ips_badhlen);
3692 goto bad;
3693 }
3694 if (hlen > m->m_len) {
3695 if ((m = m_pullup(m, hlen)) == NULL) {
3696 KMOD_IPSTAT_INC(ips_badhlen);
3697 goto bad;
3698 }
3699 ip = mtod(m, struct ip *);
3700 if (ip == NULL) goto bad;
3701 }
3702
3703 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3704 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3705 } else {
3706 if (hlen == sizeof(struct ip)) {
3707 sum = in_cksum_hdr(ip);
3708 } else {
3709 sum = in_cksum(m, hlen);
3710 }
3711 }
3712 if (sum) {
3713 KMOD_IPSTAT_INC(ips_badsum);
3714 goto bad;
3715 }
3716
3717 /* Retrieve the packet length. */
3718 len = ntohs(ip->ip_len);
3719
3720 /*
3721 * Check for additional length bogosity
3722 */
3723 if (len < hlen) {
3724 KMOD_IPSTAT_INC(ips_badlen);
3725 goto bad;
3726 }
3727
3728 /*
3729 * Check that the amount of data in the buffers
3730 * is as at least much as the IP header would have us expect.
3731 * Drop packet if shorter than we expect.
3732 */
3733 if (m->m_pkthdr.len < len) {
3734 KMOD_IPSTAT_INC(ips_tooshort);
3735 goto bad;
3736 }
3737
3738 /* Checks out, proceed */
3739 *mp = m;
3740 return (0);
3741
3742 bad:
3743 *mp = m;
3744 return (-1);
3745 }
3746 #endif /* INET */
3747
3748 #ifdef INET6
3749 /*
3750 * Same as above, but for IPv6.
3751 * Cut-and-pasted from ip6_input.c.
3752 * XXX Should we update ip6stat, or not?
3753 */
3754 static int
bridge_ip6_checkbasic(struct mbuf ** mp)3755 bridge_ip6_checkbasic(struct mbuf **mp)
3756 {
3757 struct mbuf *m = *mp;
3758 struct ip6_hdr *ip6;
3759
3760 /*
3761 * If the IPv6 header is not aligned, slurp it up into a new
3762 * mbuf with space for link headers, in the event we forward
3763 * it. Otherwise, if it is aligned, make sure the entire base
3764 * IPv6 header is in the first mbuf of the chain.
3765 */
3766 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3767 struct ifnet *inifp = m->m_pkthdr.rcvif;
3768 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3769 (max_linkhdr + 3) & ~3)) == NULL) {
3770 /* XXXJRT new stat, please */
3771 IP6STAT_INC(ip6s_toosmall);
3772 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3773 goto bad;
3774 }
3775 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3776 struct ifnet *inifp = m->m_pkthdr.rcvif;
3777 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3778 IP6STAT_INC(ip6s_toosmall);
3779 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3780 goto bad;
3781 }
3782 }
3783
3784 ip6 = mtod(m, struct ip6_hdr *);
3785
3786 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3787 IP6STAT_INC(ip6s_badvers);
3788 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3789 goto bad;
3790 }
3791
3792 /* Checks out, proceed */
3793 *mp = m;
3794 return (0);
3795
3796 bad:
3797 *mp = m;
3798 return (-1);
3799 }
3800 #endif /* INET6 */
3801
3802 #ifdef INET
3803 /*
3804 * bridge_fragment:
3805 *
3806 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3807 */
3808 static int
bridge_fragment(struct ifnet * ifp,struct mbuf ** mp,struct ether_header * eh,int snap,struct llc * llc)3809 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3810 int snap, struct llc *llc)
3811 {
3812 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3813 struct ip *ip;
3814 int error = -1;
3815
3816 if (m->m_len < sizeof(struct ip) &&
3817 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3818 goto dropit;
3819 ip = mtod(m, struct ip *);
3820
3821 m->m_pkthdr.csum_flags |= CSUM_IP;
3822 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3823 if (error)
3824 goto dropit;
3825
3826 /*
3827 * Walk the chain and re-add the Ethernet header for
3828 * each mbuf packet.
3829 */
3830 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3831 nextpkt = mcur->m_nextpkt;
3832 mcur->m_nextpkt = NULL;
3833 if (snap) {
3834 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3835 if (mcur == NULL) {
3836 error = ENOBUFS;
3837 if (mprev != NULL)
3838 mprev->m_nextpkt = nextpkt;
3839 goto dropit;
3840 }
3841 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3842 }
3843
3844 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3845 if (mcur == NULL) {
3846 error = ENOBUFS;
3847 if (mprev != NULL)
3848 mprev->m_nextpkt = nextpkt;
3849 goto dropit;
3850 }
3851 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3852
3853 /*
3854 * The previous two M_PREPEND could have inserted one or two
3855 * mbufs in front so we have to update the previous packet's
3856 * m_nextpkt.
3857 */
3858 mcur->m_nextpkt = nextpkt;
3859 if (mprev != NULL)
3860 mprev->m_nextpkt = mcur;
3861 else {
3862 /* The first mbuf in the original chain needs to be
3863 * updated. */
3864 *mp = mcur;
3865 }
3866 mprev = mcur;
3867 }
3868
3869 KMOD_IPSTAT_INC(ips_fragmented);
3870 return (error);
3871
3872 dropit:
3873 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3874 m = mcur->m_nextpkt;
3875 m_freem(mcur);
3876 }
3877 return (error);
3878 }
3879 #endif /* INET */
3880
3881 static void
bridge_linkstate(struct ifnet * ifp)3882 bridge_linkstate(struct ifnet *ifp)
3883 {
3884 struct bridge_softc *sc = ifp->if_bridge;
3885 struct bridge_iflist *bif;
3886 struct epoch_tracker et;
3887
3888 NET_EPOCH_ENTER(et);
3889
3890 bif = bridge_lookup_member_if(sc, ifp);
3891 if (bif == NULL) {
3892 NET_EPOCH_EXIT(et);
3893 return;
3894 }
3895 bridge_linkcheck(sc);
3896
3897 bstp_linkstate(&bif->bif_stp);
3898
3899 NET_EPOCH_EXIT(et);
3900 }
3901
3902 static void
bridge_linkcheck(struct bridge_softc * sc)3903 bridge_linkcheck(struct bridge_softc *sc)
3904 {
3905 struct bridge_iflist *bif;
3906 int new_link, hasls;
3907
3908 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
3909
3910 new_link = LINK_STATE_DOWN;
3911 hasls = 0;
3912 /* Our link is considered up if at least one of our ports is active */
3913 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3914 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3915 hasls++;
3916 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3917 new_link = LINK_STATE_UP;
3918 break;
3919 }
3920 }
3921 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3922 /* If no interfaces support link-state then we default to up */
3923 new_link = LINK_STATE_UP;
3924 }
3925 if_link_state_change(sc->sc_ifp, new_link);
3926 }
3927