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 "opt_inet.h"
80 #include "opt_inet6.h"
81
82 #define EXTERR_CATEGORY EXTERR_CAT_BRIDGE
83
84 #include <sys/param.h>
85 #include <sys/ctype.h> /* string functions */
86 #include <sys/eventhandler.h>
87 #include <sys/exterrvar.h>
88 #include <sys/jail.h>
89 #include <sys/kernel.h>
90 #include <sys/lock.h>
91 #include <sys/malloc.h>
92 #include <sys/mbuf.h>
93 #include <sys/module.h>
94 #include <sys/mutex.h>
95 #include <sys/priv.h>
96 #include <sys/proc.h>
97 #include <sys/protosw.h>
98 #include <sys/random.h>
99 #include <sys/systm.h>
100 #include <sys/socket.h> /* for net/if.h */
101 #include <sys/sockio.h>
102 #include <sys/syslog.h>
103 #include <sys/sysctl.h>
104 #include <sys/time.h>
105
106 #include <vm/uma.h>
107
108 #include <net/bpf.h>
109 #include <net/if.h>
110 #include <net/if_clone.h>
111 #include <net/if_dl.h>
112 #include <net/if_types.h>
113 #include <net/if_var.h>
114 #include <net/if_private.h>
115 #include <net/pfil.h>
116 #include <net/vnet.h>
117
118 #include <netinet/in.h>
119 #include <netinet/in_systm.h>
120 #include <netinet/in_var.h>
121 #include <netinet/ip.h>
122 #include <netinet/ip_var.h>
123 #ifdef INET6
124 #include <netinet/ip6.h>
125 #include <netinet6/ip6_var.h>
126 #include <netinet6/in6_ifattach.h>
127 #endif
128 #if defined(INET) || defined(INET6)
129 #include <netinet/ip_carp.h>
130 #endif
131 #include <machine/in_cksum.h>
132 #include <netinet/if_ether.h>
133 #include <net/bridgestp.h>
134 #include <net/if_bridgevar.h>
135 #include <net/if_llc.h>
136 #include <net/if_vlan_var.h>
137
138 #include <net/route.h>
139
140 /*
141 * At various points in the code we need to know if we're hooked into the INET
142 * and/or INET6 pfil. Define some macros to do that based on which IP versions
143 * are enabled in the kernel. This avoids littering the rest of the code with
144 * #ifnet INET6 to avoid referencing V_inet6_pfil_head.
145 */
146 #ifdef INET6
147 #define PFIL_HOOKED_IN_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head)
148 #define PFIL_HOOKED_OUT_INET6 PFIL_HOOKED_OUT(V_inet6_pfil_head)
149 #else
150 #define PFIL_HOOKED_IN_INET6 false
151 #define PFIL_HOOKED_OUT_INET6 false
152 #endif
153
154 #ifdef INET
155 #define PFIL_HOOKED_IN_INET PFIL_HOOKED_IN(V_inet_pfil_head)
156 #define PFIL_HOOKED_OUT_INET PFIL_HOOKED_OUT(V_inet_pfil_head)
157 #else
158 #define PFIL_HOOKED_IN_INET false
159 #define PFIL_HOOKED_OUT_INET false
160 #endif
161
162 #define PFIL_HOOKED_IN_46 (PFIL_HOOKED_IN_INET6 || PFIL_HOOKED_IN_INET)
163 #define PFIL_HOOKED_OUT_46 (PFIL_HOOKED_OUT_INET6 || PFIL_HOOKED_OUT_INET)
164
165 /*
166 * Size of the route hash table. Must be a power of two.
167 */
168 #ifndef BRIDGE_RTHASH_SIZE
169 #define BRIDGE_RTHASH_SIZE 1024
170 #endif
171
172 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
173
174 /*
175 * Default maximum number of addresses to cache.
176 */
177 #ifndef BRIDGE_RTABLE_MAX
178 #define BRIDGE_RTABLE_MAX 2000
179 #endif
180
181 /*
182 * Timeout (in seconds) for entries learned dynamically.
183 */
184 #ifndef BRIDGE_RTABLE_TIMEOUT
185 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
186 #endif
187
188 /*
189 * Number of seconds between walks of the route list.
190 */
191 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
192 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
193 #endif
194
195 /*
196 * List of capabilities to possibly mask on the member interface.
197 */
198 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
199 IFCAP_TXCSUM_IPV6|IFCAP_MEXTPG)
200
201 /*
202 * List of capabilities to strip
203 */
204 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
205
206 /*
207 * Bridge locking
208 *
209 * The bridge relies heavily on the epoch(9) system to protect its data
210 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we
211 * must ensure there is only one writer at a time.
212 *
213 * That is: for read accesses we only need to be in NET_EPOCH, but for write
214 * accesses we must hold:
215 *
216 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes
217 * - BRIDGE_LOCK, for any other change
218 *
219 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl()
220 * calls to bridge member interfaces and these ioctl()s can sleep.
221 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes
222 * required while we're in NET_EPOCH and then we're not allowed to sleep.
223 */
224 #define BRIDGE_LOCK_INIT(_sc) do { \
225 sx_init(&(_sc)->sc_sx, "if_bridge"); \
226 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \
227 } while (0)
228 #define BRIDGE_LOCK_DESTROY(_sc) do { \
229 sx_destroy(&(_sc)->sc_sx); \
230 mtx_destroy(&(_sc)->sc_rt_mtx); \
231 } while (0)
232 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx)
233 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx)
234 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED)
235 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
236 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx))
237 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED)
238 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx)
239 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx)
240 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED)
241 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
242 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx))
243
244 struct bridge_softc;
245
246 /*
247 * Bridge interface list entry.
248 */
249 struct bridge_iflist {
250 CK_LIST_ENTRY(bridge_iflist) bif_next;
251 struct ifnet *bif_ifp; /* member if */
252 struct bridge_softc *bif_sc; /* parent bridge */
253 struct bstp_port bif_stp; /* STP state */
254 uint32_t bif_flags; /* member if flags */
255 int bif_savedcaps; /* saved capabilities */
256 uint32_t bif_addrmax; /* max # of addresses */
257 uint32_t bif_addrcnt; /* cur. # of addresses */
258 uint32_t bif_addrexceeded;/* # of address violations */
259 struct epoch_context bif_epoch_ctx;
260 ether_vlanid_t bif_pvid; /* port vlan id */
261 ifbvlan_set_t bif_vlan_set; /* if allowed tagged vlans */
262 uint16_t bif_vlanproto; /* vlan protocol */
263 };
264
265 /*
266 * Bridge route node.
267 */
268 struct bridge_rtnode {
269 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
270 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
271 struct bridge_iflist *brt_dst; /* destination if */
272 unsigned long brt_expire; /* expiration time */
273 uint8_t brt_flags; /* address flags */
274 uint8_t brt_addr[ETHER_ADDR_LEN];
275 ether_vlanid_t brt_vlan; /* vlan id */
276 struct vnet *brt_vnet;
277 struct epoch_context brt_epoch_ctx;
278 };
279 #define brt_ifp brt_dst->bif_ifp
280
281 /*
282 * Software state for each bridge.
283 */
284 struct bridge_softc {
285 struct ifnet *sc_ifp; /* make this an interface */
286 LIST_ENTRY(bridge_softc) sc_list;
287 struct sx sc_sx;
288 struct mtx sc_rt_mtx;
289 uint32_t sc_brtmax; /* max # of addresses */
290 uint32_t sc_brtcnt; /* cur. # of addresses */
291 uint32_t sc_brttimeout; /* rt timeout in seconds */
292 struct callout sc_brcallout; /* bridge callout */
293 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
294 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
295 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
296 uint32_t sc_rthash_key; /* key for hash */
297 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
298 struct bstp_state sc_stp; /* STP state */
299 uint32_t sc_brtexceeded; /* # of cache drops */
300 struct ifnet *sc_ifaddr; /* member mac copied from */
301 struct ether_addr sc_defaddr; /* Default MAC address */
302 if_input_fn_t sc_if_input; /* Saved copy of if_input */
303 struct epoch_context sc_epoch_ctx;
304 ifbr_flags_t sc_flags; /* bridge flags */
305 ether_vlanid_t sc_defpvid; /* default PVID */
306 };
307
308 VNET_DEFINE_STATIC(struct sx, bridge_list_sx);
309 #define V_bridge_list_sx VNET(bridge_list_sx)
310 static eventhandler_tag bridge_detach_cookie;
311
312 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
313
314 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
315 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone)
316
317 static int bridge_clone_create(struct if_clone *, char *, size_t,
318 struct ifc_data *, struct ifnet **);
319 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t);
320
321 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
322 static void bridge_mutecaps(struct bridge_softc *);
323 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
324 int);
325 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
326 static void bridge_init(void *);
327 static void bridge_dummynet(struct mbuf *, struct ifnet *);
328 static bool bridge_same(const void *, const void *);
329 static void *bridge_get_softc(struct ifnet *);
330 static void bridge_stop(struct ifnet *, int);
331 static int bridge_transmit(struct ifnet *, struct mbuf *);
332 #ifdef ALTQ
333 static void bridge_altq_start(if_t);
334 static int bridge_altq_transmit(if_t, struct mbuf *);
335 #endif
336 static void bridge_qflush(struct ifnet *);
337 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
338 static void bridge_inject(struct ifnet *, struct mbuf *);
339 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
340 struct rtentry *);
341 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
342 struct mbuf *, struct bridge_iflist *);
343 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
344
345 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
346 struct mbuf *m);
347 static bool bridge_member_ifaddrs(void);
348 static void bridge_timer(void *);
349
350 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
351 struct mbuf *, int);
352 static void bridge_span(struct bridge_softc *, struct mbuf *);
353
354 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
355 ether_vlanid_t, struct bridge_iflist *, int, uint8_t);
356 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
357 ether_vlanid_t);
358 static void bridge_rttrim(struct bridge_softc *);
359 static void bridge_rtage(struct bridge_softc *);
360 static void bridge_rtflush(struct bridge_softc *, int);
361 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
362 ether_vlanid_t);
363 static bool bridge_vfilter_in(const struct bridge_iflist *, struct mbuf *);
364 static bool bridge_vfilter_out(const struct bridge_iflist *,
365 const struct mbuf *);
366
367 static void bridge_rtable_init(struct bridge_softc *);
368 static void bridge_rtable_fini(struct bridge_softc *);
369
370 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
371 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
372 const uint8_t *, ether_vlanid_t);
373 static int bridge_rtnode_insert(struct bridge_softc *,
374 struct bridge_rtnode *);
375 static void bridge_rtnode_destroy(struct bridge_softc *,
376 struct bridge_rtnode *);
377 static void bridge_rtable_expire(struct ifnet *, int);
378 static void bridge_state_change(struct ifnet *, int);
379
380 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
381 const char *name);
382 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
383 struct ifnet *ifp);
384 static void bridge_delete_member(struct bridge_softc *,
385 struct bridge_iflist *, int);
386 static void bridge_delete_span(struct bridge_softc *,
387 struct bridge_iflist *);
388
389 static int bridge_ioctl_add(struct bridge_softc *, void *);
390 static int bridge_ioctl_del(struct bridge_softc *, void *);
391 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
392 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
393 static int bridge_ioctl_scache(struct bridge_softc *, void *);
394 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
395 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
396 static int bridge_ioctl_rts(struct bridge_softc *, void *);
397 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
398 static int bridge_ioctl_sto(struct bridge_softc *, void *);
399 static int bridge_ioctl_gto(struct bridge_softc *, void *);
400 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
401 static int bridge_ioctl_flush(struct bridge_softc *, void *);
402 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
403 static int bridge_ioctl_spri(struct bridge_softc *, void *);
404 static int bridge_ioctl_ght(struct bridge_softc *, void *);
405 static int bridge_ioctl_sht(struct bridge_softc *, void *);
406 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
407 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
408 static int bridge_ioctl_gma(struct bridge_softc *, void *);
409 static int bridge_ioctl_sma(struct bridge_softc *, void *);
410 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
411 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
412 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
413 static int bridge_ioctl_sifpvid(struct bridge_softc *, void *);
414 static int bridge_ioctl_sifvlanset(struct bridge_softc *, void *);
415 static int bridge_ioctl_gifvlanset(struct bridge_softc *, void *);
416 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
417 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
418 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
419 static int bridge_ioctl_grte(struct bridge_softc *, void *);
420 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
421 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
422 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
423 static int bridge_ioctl_gflags(struct bridge_softc *, void *);
424 static int bridge_ioctl_sflags(struct bridge_softc *, void *);
425 static int bridge_ioctl_gdefpvid(struct bridge_softc *, void *);
426 static int bridge_ioctl_sdefpvid(struct bridge_softc *, void *);
427 static int bridge_ioctl_svlanproto(struct bridge_softc *, void *);
428 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
429 int);
430 #ifdef INET
431 static int bridge_ip_checkbasic(struct mbuf **mp);
432 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
433 struct ether_header *, int, struct llc *);
434 #endif /* INET */
435 #ifdef INET6
436 static int bridge_ip6_checkbasic(struct mbuf **mp);
437 #endif /* INET6 */
438 static void bridge_linkstate(struct ifnet *ifp);
439 static void bridge_linkcheck(struct bridge_softc *sc);
440
441 /*
442 * Use the "null" value from IEEE 802.1Q-2014 Table 9-2
443 * to indicate untagged frames.
444 */
445 #define VLANTAGOF(_m) \
446 ((_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : DOT1Q_VID_NULL)
447
448 static struct bstp_cb_ops bridge_ops = {
449 .bcb_state = bridge_state_change,
450 .bcb_rtage = bridge_rtable_expire
451 };
452
453 SYSCTL_DECL(_net_link);
454 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
455 "Bridge");
456
457 /* only pass IP[46] packets when pfil is enabled */
458 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
459 #define V_pfil_onlyip VNET(pfil_onlyip)
460 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
461 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
462 "Only pass IP packets when pfil is enabled");
463
464 /* run pfil hooks on the bridge interface */
465 VNET_DEFINE_STATIC(int, pfil_bridge) = 0;
466 #define V_pfil_bridge VNET(pfil_bridge)
467 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
468 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
469 "Packet filter on the bridge interface");
470
471 /* layer2 filter with ipfw */
472 VNET_DEFINE_STATIC(int, pfil_ipfw);
473 #define V_pfil_ipfw VNET(pfil_ipfw)
474
475 /* layer2 ARP filter with ipfw */
476 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
477 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
478 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
479 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
480 "Filter ARP packets through IPFW layer2");
481
482 /* run pfil hooks on the member interface */
483 VNET_DEFINE_STATIC(int, pfil_member) = 0;
484 #define V_pfil_member VNET(pfil_member)
485 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
486 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
487 "Packet filter on the member interface");
488
489 /* run pfil hooks on the physical interface for locally destined packets */
490 VNET_DEFINE_STATIC(int, pfil_local_phys);
491 #define V_pfil_local_phys VNET(pfil_local_phys)
492 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
493 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
494 "Packet filter on the physical interface for locally destined packets");
495
496 /* log STP state changes */
497 VNET_DEFINE_STATIC(int, log_stp);
498 #define V_log_stp VNET(log_stp)
499 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
500 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
501 "Log STP state changes");
502
503 /* share MAC with first bridge member */
504 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
505 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
506 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
507 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
508 "Inherit MAC address from the first bridge member");
509
510 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
511 #define V_allow_llz_overlap VNET(allow_llz_overlap)
512 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
513 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
514 "Allow overlap of link-local scope "
515 "zones of a bridge interface and the member interfaces");
516
517 /* log MAC address port flapping */
518 VNET_DEFINE_STATIC(bool, log_mac_flap) = true;
519 #define V_log_mac_flap VNET(log_mac_flap)
520 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, log_mac_flap,
521 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(log_mac_flap), true,
522 "Log MAC address port flapping");
523
524 /* allow IP addresses on bridge members */
525 VNET_DEFINE_STATIC(bool, member_ifaddrs) = true;
526 #define V_member_ifaddrs VNET(member_ifaddrs)
527 SYSCTL_BOOL(_net_link_bridge, OID_AUTO, member_ifaddrs,
528 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(member_ifaddrs), false,
529 "Allow layer 3 addresses on bridge members (deprecated)");
530
531 static bool
bridge_member_ifaddrs(void)532 bridge_member_ifaddrs(void)
533 {
534 return (V_member_ifaddrs);
535 }
536
537 VNET_DEFINE_STATIC(int, log_interval) = 5;
538 VNET_DEFINE_STATIC(int, log_count) = 0;
539 VNET_DEFINE_STATIC(struct timeval, log_last) = { 0 };
540
541 #define V_log_interval VNET(log_interval)
542 #define V_log_count VNET(log_count)
543 #define V_log_last VNET(log_last)
544
545 struct bridge_control {
546 int (*bc_func)(struct bridge_softc *, void *);
547 int bc_argsize;
548 int bc_flags;
549 };
550
551 #define BC_F_COPYIN 0x01 /* copy arguments in */
552 #define BC_F_COPYOUT 0x02 /* copy arguments out */
553 #define BC_F_SUSER 0x04 /* do super-user check */
554
555 static const struct bridge_control bridge_control_table[] = {
556 { bridge_ioctl_add, sizeof(struct ifbreq),
557 BC_F_COPYIN|BC_F_SUSER },
558 { bridge_ioctl_del, sizeof(struct ifbreq),
559 BC_F_COPYIN|BC_F_SUSER },
560
561 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
562 BC_F_COPYIN|BC_F_COPYOUT },
563 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
564 BC_F_COPYIN|BC_F_SUSER },
565
566 { bridge_ioctl_scache, sizeof(struct ifbrparam),
567 BC_F_COPYIN|BC_F_SUSER },
568 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
569 BC_F_COPYOUT },
570
571 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
572 BC_F_COPYIN|BC_F_COPYOUT },
573 { bridge_ioctl_rts, sizeof(struct ifbaconf),
574 BC_F_COPYIN|BC_F_COPYOUT },
575
576 { bridge_ioctl_saddr, sizeof(struct ifbareq),
577 BC_F_COPYIN|BC_F_SUSER },
578
579 { bridge_ioctl_sto, sizeof(struct ifbrparam),
580 BC_F_COPYIN|BC_F_SUSER },
581 { bridge_ioctl_gto, sizeof(struct ifbrparam),
582 BC_F_COPYOUT },
583
584 { bridge_ioctl_daddr, sizeof(struct ifbareq),
585 BC_F_COPYIN|BC_F_SUSER },
586
587 { bridge_ioctl_flush, sizeof(struct ifbreq),
588 BC_F_COPYIN|BC_F_SUSER },
589
590 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
591 BC_F_COPYOUT },
592 { bridge_ioctl_spri, sizeof(struct ifbrparam),
593 BC_F_COPYIN|BC_F_SUSER },
594
595 { bridge_ioctl_ght, sizeof(struct ifbrparam),
596 BC_F_COPYOUT },
597 { bridge_ioctl_sht, sizeof(struct ifbrparam),
598 BC_F_COPYIN|BC_F_SUSER },
599
600 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
601 BC_F_COPYOUT },
602 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
603 BC_F_COPYIN|BC_F_SUSER },
604
605 { bridge_ioctl_gma, sizeof(struct ifbrparam),
606 BC_F_COPYOUT },
607 { bridge_ioctl_sma, sizeof(struct ifbrparam),
608 BC_F_COPYIN|BC_F_SUSER },
609
610 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
611 BC_F_COPYIN|BC_F_SUSER },
612
613 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
614 BC_F_COPYIN|BC_F_SUSER },
615
616 { bridge_ioctl_addspan, sizeof(struct ifbreq),
617 BC_F_COPYIN|BC_F_SUSER },
618 { bridge_ioctl_delspan, sizeof(struct ifbreq),
619 BC_F_COPYIN|BC_F_SUSER },
620
621 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
622 BC_F_COPYOUT },
623
624 { bridge_ioctl_grte, sizeof(struct ifbrparam),
625 BC_F_COPYOUT },
626
627 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
628 BC_F_COPYIN|BC_F_COPYOUT },
629
630 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
631 BC_F_COPYIN|BC_F_SUSER },
632
633 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
634 BC_F_COPYIN|BC_F_SUSER },
635
636 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
637 BC_F_COPYIN|BC_F_SUSER },
638
639 { bridge_ioctl_sifpvid, sizeof(struct ifbreq),
640 BC_F_COPYIN|BC_F_SUSER },
641
642 { bridge_ioctl_sifvlanset, sizeof(struct ifbif_vlan_req),
643 BC_F_COPYIN|BC_F_SUSER },
644
645 { bridge_ioctl_gifvlanset, sizeof(struct ifbif_vlan_req),
646 BC_F_COPYIN|BC_F_COPYOUT },
647
648 { bridge_ioctl_gflags, sizeof(struct ifbrparam),
649 BC_F_COPYOUT },
650
651 { bridge_ioctl_sflags, sizeof(struct ifbrparam),
652 BC_F_COPYIN|BC_F_SUSER },
653
654 { bridge_ioctl_gdefpvid, sizeof(struct ifbrparam),
655 BC_F_COPYOUT },
656
657 { bridge_ioctl_sdefpvid, sizeof(struct ifbrparam),
658 BC_F_COPYIN|BC_F_SUSER },
659
660 { bridge_ioctl_svlanproto, sizeof(struct ifbreq),
661 BC_F_COPYIN|BC_F_SUSER },
662 };
663 static const int bridge_control_table_size = nitems(bridge_control_table);
664
665 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list) =
666 LIST_HEAD_INITIALIZER();
667 #define V_bridge_list VNET(bridge_list)
668 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \
669 "if_bridge list")
670 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx)
671 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx)
672 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx)
673
674 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
675 #define V_bridge_cloner VNET(bridge_cloner)
676
677 static const char bridge_name[] = "bridge";
678
679 static void
vnet_bridge_init(const void * unused __unused)680 vnet_bridge_init(const void *unused __unused)
681 {
682
683 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
684 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
685 UMA_ALIGN_PTR, 0);
686 BRIDGE_LIST_LOCK_INIT();
687
688 struct if_clone_addreq req = {
689 .create_f = bridge_clone_create,
690 .destroy_f = bridge_clone_destroy,
691 .flags = IFC_F_AUTOUNIT,
692 };
693 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req);
694 }
695 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
696 vnet_bridge_init, NULL);
697
698 static void
vnet_bridge_uninit(const void * unused __unused)699 vnet_bridge_uninit(const void *unused __unused)
700 {
701
702 ifc_detach_cloner(V_bridge_cloner);
703 V_bridge_cloner = NULL;
704 BRIDGE_LIST_LOCK_DESTROY();
705
706 /* Callbacks may use the UMA zone. */
707 NET_EPOCH_DRAIN_CALLBACKS();
708
709 uma_zdestroy(V_bridge_rtnode_zone);
710 }
711 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
712 vnet_bridge_uninit, NULL);
713
714 static int
bridge_modevent(module_t mod,int type,void * data)715 bridge_modevent(module_t mod, int type, void *data)
716 {
717
718 switch (type) {
719 case MOD_LOAD:
720 bridge_dn_p = bridge_dummynet;
721 bridge_same_p = bridge_same;
722 bridge_get_softc_p = bridge_get_softc;
723 bridge_member_ifaddrs_p = bridge_member_ifaddrs;
724 bridge_detach_cookie = EVENTHANDLER_REGISTER(
725 ifnet_departure_event, bridge_ifdetach, NULL,
726 EVENTHANDLER_PRI_ANY);
727 break;
728 case MOD_UNLOAD:
729 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
730 bridge_detach_cookie);
731 bridge_dn_p = NULL;
732 bridge_same_p = NULL;
733 bridge_get_softc_p = NULL;
734 bridge_member_ifaddrs_p = NULL;
735 break;
736 default:
737 return (EOPNOTSUPP);
738 }
739 return (0);
740 }
741
742 static moduledata_t bridge_mod = {
743 "if_bridge",
744 bridge_modevent,
745 0
746 };
747
748 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
749 MODULE_VERSION(if_bridge, 1);
750 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
751
752 /*
753 * handler for net.link.bridge.ipfw
754 */
755 static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)756 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
757 {
758 int enable = V_pfil_ipfw;
759 int error;
760
761 error = sysctl_handle_int(oidp, &enable, 0, req);
762 enable &= 1;
763
764 if (enable != V_pfil_ipfw) {
765 V_pfil_ipfw = enable;
766
767 /*
768 * Disable pfil so that ipfw doesnt run twice, if the user
769 * really wants both then they can re-enable pfil_bridge and/or
770 * pfil_member. Also allow non-ip packets as ipfw can filter by
771 * layer2 type.
772 */
773 if (V_pfil_ipfw) {
774 V_pfil_onlyip = 0;
775 V_pfil_bridge = 0;
776 V_pfil_member = 0;
777 }
778 }
779
780 return (error);
781 }
782 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
783 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
784 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
785 "Layer2 filter with IPFW");
786
787 #ifdef VIMAGE
788 static void
bridge_reassign(struct ifnet * ifp,struct vnet * newvnet,char * arg)789 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg)
790 {
791 struct bridge_softc *sc = ifp->if_softc;
792 struct bridge_iflist *bif;
793
794 BRIDGE_LOCK(sc);
795
796 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
797 bridge_delete_member(sc, bif, 0);
798
799 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
800 bridge_delete_span(sc, bif);
801 }
802
803 BRIDGE_UNLOCK(sc);
804
805 ether_reassign(ifp, newvnet, arg);
806 }
807 #endif
808
809 /*
810 * bridge_get_softc:
811 *
812 * Return the bridge softc for an ifnet.
813 */
814 static void *
bridge_get_softc(struct ifnet * ifp)815 bridge_get_softc(struct ifnet *ifp)
816 {
817 struct bridge_iflist *bif;
818
819 NET_EPOCH_ASSERT();
820
821 bif = ifp->if_bridge;
822 if (bif == NULL)
823 return (NULL);
824 return (bif->bif_sc);
825 }
826
827 /*
828 * bridge_same:
829 *
830 * Return true if two interfaces are in the same bridge. This is only used by
831 * bridgestp via bridge_same_p.
832 */
833 static bool
bridge_same(const void * bifap,const void * bifbp)834 bridge_same(const void *bifap, const void *bifbp)
835 {
836 const struct bridge_iflist *bifa = bifap, *bifb = bifbp;
837
838 NET_EPOCH_ASSERT();
839
840 if (bifa == NULL || bifb == NULL)
841 return (false);
842
843 return (bifa->bif_sc == bifb->bif_sc);
844 }
845
846 /*
847 * bridge_clone_create:
848 *
849 * Create a new bridge instance.
850 */
851 static int
bridge_clone_create(struct if_clone * ifc,char * name,size_t len,struct ifc_data * ifd,struct ifnet ** ifpp)852 bridge_clone_create(struct if_clone *ifc, char *name, size_t len,
853 struct ifc_data *ifd, struct ifnet **ifpp)
854 {
855 struct bridge_softc *sc;
856 struct ifnet *ifp;
857
858 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
859 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
860
861 BRIDGE_LOCK_INIT(sc);
862 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
863 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
864
865 /* Initialize our routing table. */
866 bridge_rtable_init(sc);
867
868 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0);
869
870 CK_LIST_INIT(&sc->sc_iflist);
871 CK_LIST_INIT(&sc->sc_spanlist);
872
873 ifp->if_softc = sc;
874 if_initname(ifp, bridge_name, ifd->unit);
875 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
876 ifp->if_capabilities = ifp->if_capenable = IFCAP_VLAN_HWTAGGING;
877 ifp->if_ioctl = bridge_ioctl;
878 #ifdef ALTQ
879 ifp->if_start = bridge_altq_start;
880 ifp->if_transmit = bridge_altq_transmit;
881 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
882 ifp->if_snd.ifq_drv_maxlen = 0;
883 IFQ_SET_READY(&ifp->if_snd);
884 #else
885 ifp->if_transmit = bridge_transmit;
886 #endif
887 ifp->if_qflush = bridge_qflush;
888 ifp->if_init = bridge_init;
889 ifp->if_type = IFT_BRIDGE;
890
891 ether_gen_addr(ifp, &sc->sc_defaddr);
892
893 bstp_attach(&sc->sc_stp, &bridge_ops);
894 ether_ifattach(ifp, sc->sc_defaddr.octet);
895 /* Now undo some of the damage... */
896 ifp->if_baudrate = 0;
897 #ifdef VIMAGE
898 ifp->if_reassign = bridge_reassign;
899 #endif
900 sc->sc_if_input = ifp->if_input; /* ether_input */
901 ifp->if_input = bridge_inject;
902
903 /*
904 * Allow BRIDGE_INPUT() to pass in packets originating from the bridge
905 * itself via bridge_inject(). This is required for netmap but
906 * otherwise has no effect.
907 */
908 ifp->if_bridge_input = bridge_input;
909
910 BRIDGE_LIST_LOCK();
911 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
912 BRIDGE_LIST_UNLOCK();
913 *ifpp = ifp;
914
915 return (0);
916 }
917
918 static void
bridge_clone_destroy_cb(struct epoch_context * ctx)919 bridge_clone_destroy_cb(struct epoch_context *ctx)
920 {
921 struct bridge_softc *sc;
922
923 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx);
924
925 BRIDGE_LOCK_DESTROY(sc);
926 free(sc, M_DEVBUF);
927 }
928
929 /*
930 * bridge_clone_destroy:
931 *
932 * Destroy a bridge instance.
933 */
934 static int
bridge_clone_destroy(struct if_clone * ifc,struct ifnet * ifp,uint32_t flags)935 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
936 {
937 struct bridge_softc *sc = ifp->if_softc;
938 struct bridge_iflist *bif;
939 struct epoch_tracker et;
940
941 BRIDGE_LOCK(sc);
942
943 bridge_stop(ifp, 1);
944 ifp->if_flags &= ~IFF_UP;
945
946 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
947 bridge_delete_member(sc, bif, 0);
948
949 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
950 bridge_delete_span(sc, bif);
951 }
952
953 /* Tear down the routing table. */
954 bridge_rtable_fini(sc);
955
956 BRIDGE_UNLOCK(sc);
957
958 NET_EPOCH_ENTER(et);
959
960 callout_drain(&sc->sc_brcallout);
961
962 BRIDGE_LIST_LOCK();
963 LIST_REMOVE(sc, sc_list);
964 BRIDGE_LIST_UNLOCK();
965
966 bstp_detach(&sc->sc_stp);
967 #ifdef ALTQ
968 IFQ_PURGE(&ifp->if_snd);
969 #endif
970 NET_EPOCH_EXIT(et);
971
972 ether_ifdetach(ifp);
973 if_free(ifp);
974
975 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx);
976
977 return (0);
978 }
979
980 /*
981 * bridge_ioctl:
982 *
983 * Handle a control request from the operator.
984 */
985 static int
bridge_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)986 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
987 {
988 struct bridge_softc *sc = ifp->if_softc;
989 struct ifreq *ifr = (struct ifreq *)data;
990 struct bridge_iflist *bif;
991 struct thread *td = curthread;
992 union {
993 struct ifbreq ifbreq;
994 struct ifbifconf ifbifconf;
995 struct ifbareq ifbareq;
996 struct ifbaconf ifbaconf;
997 struct ifbrparam ifbrparam;
998 struct ifbropreq ifbropreq;
999 struct ifbif_vlan_req ifvlanreq;
1000 } args;
1001 struct ifdrv *ifd = (struct ifdrv *) data;
1002 const struct bridge_control *bc;
1003 int error = 0, oldmtu;
1004
1005 BRIDGE_LOCK(sc);
1006
1007 switch (cmd) {
1008 case SIOCADDMULTI:
1009 case SIOCDELMULTI:
1010 break;
1011
1012 case SIOCGDRVSPEC:
1013 case SIOCSDRVSPEC:
1014 if (ifd->ifd_cmd >= bridge_control_table_size) {
1015 error = EXTERROR(EINVAL, "Invalid control command");
1016 break;
1017 }
1018 bc = &bridge_control_table[ifd->ifd_cmd];
1019
1020 if (cmd == SIOCGDRVSPEC &&
1021 (bc->bc_flags & BC_F_COPYOUT) == 0) {
1022 error = EXTERROR(EINVAL,
1023 "Inappropriate ioctl for command "
1024 "(expected SIOCSDRVSPEC)");
1025 break;
1026 }
1027 else if (cmd == SIOCSDRVSPEC &&
1028 (bc->bc_flags & BC_F_COPYOUT) != 0) {
1029 error = EXTERROR(EINVAL,
1030 "Inappropriate ioctl for command "
1031 "(expected SIOCGDRVSPEC)");
1032 break;
1033 }
1034
1035 if (bc->bc_flags & BC_F_SUSER) {
1036 error = priv_check(td, PRIV_NET_BRIDGE);
1037 if (error) {
1038 EXTERROR(error, "PRIV_NET_BRIDGE required");
1039 break;
1040 }
1041 }
1042
1043 if (ifd->ifd_len != bc->bc_argsize ||
1044 ifd->ifd_len > sizeof(args)) {
1045 error = EXTERROR(EINVAL, "Invalid argument size");
1046 break;
1047 }
1048
1049 bzero(&args, sizeof(args));
1050 if (bc->bc_flags & BC_F_COPYIN) {
1051 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
1052 if (error)
1053 break;
1054 }
1055
1056 oldmtu = ifp->if_mtu;
1057 error = (*bc->bc_func)(sc, &args);
1058 if (error)
1059 break;
1060
1061 /*
1062 * Bridge MTU may change during addition of the first port.
1063 * If it did, do network layer specific procedure.
1064 */
1065 if (ifp->if_mtu != oldmtu)
1066 if_notifymtu(ifp);
1067
1068 if (bc->bc_flags & BC_F_COPYOUT)
1069 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
1070
1071 break;
1072
1073 case SIOCSIFFLAGS:
1074 if (!(ifp->if_flags & IFF_UP) &&
1075 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1076 /*
1077 * If interface is marked down and it is running,
1078 * then stop and disable it.
1079 */
1080 bridge_stop(ifp, 1);
1081 } else if ((ifp->if_flags & IFF_UP) &&
1082 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1083 /*
1084 * If interface is marked up and it is stopped, then
1085 * start it.
1086 */
1087 BRIDGE_UNLOCK(sc);
1088 (*ifp->if_init)(sc);
1089 BRIDGE_LOCK(sc);
1090 }
1091 break;
1092
1093 case SIOCSIFMTU:
1094 oldmtu = sc->sc_ifp->if_mtu;
1095
1096 if (ifr->ifr_mtu < IF_MINMTU) {
1097 error = EXTERROR(EINVAL,
1098 "Requested MTU is lower than IF_MINMTU");
1099 break;
1100 }
1101 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1102 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
1103 break;
1104 }
1105 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1106 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
1107 SIOCSIFMTU, (caddr_t)ifr);
1108 if (error != 0) {
1109 log(LOG_NOTICE, "%s: invalid MTU: %u for"
1110 " member %s\n", sc->sc_ifp->if_xname,
1111 ifr->ifr_mtu,
1112 bif->bif_ifp->if_xname);
1113 error = EINVAL;
1114 break;
1115 }
1116 }
1117 if (error) {
1118 /* Restore the previous MTU on all member interfaces. */
1119 ifr->ifr_mtu = oldmtu;
1120 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1121 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
1122 SIOCSIFMTU, (caddr_t)ifr);
1123 }
1124 EXTERROR(error,
1125 "Failed to set MTU on member interface");
1126 } else {
1127 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
1128 }
1129 break;
1130 default:
1131 /*
1132 * drop the lock as ether_ioctl() will call bridge_start() and
1133 * cause the lock to be recursed.
1134 */
1135 BRIDGE_UNLOCK(sc);
1136 error = ether_ioctl(ifp, cmd, data);
1137 BRIDGE_LOCK(sc);
1138 break;
1139 }
1140
1141 BRIDGE_UNLOCK(sc);
1142
1143 return (error);
1144 }
1145
1146 /*
1147 * bridge_mutecaps:
1148 *
1149 * Clear or restore unwanted capabilities on the member interface
1150 */
1151 static void
bridge_mutecaps(struct bridge_softc * sc)1152 bridge_mutecaps(struct bridge_softc *sc)
1153 {
1154 struct bridge_iflist *bif;
1155 int enabled, mask;
1156
1157 BRIDGE_LOCK_ASSERT(sc);
1158
1159 /* Initial bitmask of capabilities to test */
1160 mask = BRIDGE_IFCAPS_MASK;
1161
1162 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1163 /* Every member must support it or it's disabled */
1164 mask &= bif->bif_savedcaps;
1165 }
1166
1167 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1168 enabled = bif->bif_ifp->if_capenable;
1169 enabled &= ~BRIDGE_IFCAPS_STRIP;
1170 /* Strip off mask bits and enable them again if allowed */
1171 enabled &= ~BRIDGE_IFCAPS_MASK;
1172 enabled |= mask;
1173 bridge_set_ifcap(sc, bif, enabled);
1174 }
1175 }
1176
1177 static void
bridge_set_ifcap(struct bridge_softc * sc,struct bridge_iflist * bif,int set)1178 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
1179 {
1180 struct ifnet *ifp = bif->bif_ifp;
1181 struct ifreq ifr;
1182 int error, mask, stuck;
1183
1184 bzero(&ifr, sizeof(ifr));
1185 ifr.ifr_reqcap = set;
1186
1187 if (ifp->if_capenable != set) {
1188 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
1189 if (error)
1190 if_printf(sc->sc_ifp,
1191 "error setting capabilities on %s: %d\n",
1192 ifp->if_xname, error);
1193 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1194 stuck = ifp->if_capenable & mask & ~set;
1195 if (stuck != 0)
1196 if_printf(sc->sc_ifp,
1197 "can't disable some capabilities on %s: 0x%x\n",
1198 ifp->if_xname, stuck);
1199 }
1200 }
1201
1202 /*
1203 * bridge_lookup_member:
1204 *
1205 * Lookup a bridge member interface.
1206 */
1207 static struct bridge_iflist *
bridge_lookup_member(struct bridge_softc * sc,const char * name)1208 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1209 {
1210 struct bridge_iflist *bif;
1211 struct ifnet *ifp;
1212
1213 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1214
1215 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1216 ifp = bif->bif_ifp;
1217 if (strcmp(ifp->if_xname, name) == 0)
1218 return (bif);
1219 }
1220
1221 return (NULL);
1222 }
1223
1224 /*
1225 * bridge_lookup_member_if:
1226 *
1227 * Lookup a bridge member interface by ifnet*.
1228 */
1229 static struct bridge_iflist *
bridge_lookup_member_if(struct bridge_softc * sc,struct ifnet * member_ifp)1230 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1231 {
1232 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1233 return (member_ifp->if_bridge);
1234 }
1235
1236 static void
bridge_delete_member_cb(struct epoch_context * ctx)1237 bridge_delete_member_cb(struct epoch_context *ctx)
1238 {
1239 struct bridge_iflist *bif;
1240
1241 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx);
1242
1243 free(bif, M_DEVBUF);
1244 }
1245
1246 /*
1247 * bridge_delete_member:
1248 *
1249 * Delete the specified member interface.
1250 */
1251 static void
bridge_delete_member(struct bridge_softc * sc,struct bridge_iflist * bif,int gone)1252 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1253 int gone)
1254 {
1255 struct ifnet *ifs = bif->bif_ifp;
1256 struct ifnet *fif = NULL;
1257 struct bridge_iflist *bifl;
1258
1259 BRIDGE_LOCK_ASSERT(sc);
1260
1261 if (bif->bif_flags & IFBIF_STP)
1262 bstp_disable(&bif->bif_stp);
1263
1264 ifs->if_bridge = NULL;
1265 CK_LIST_REMOVE(bif, bif_next);
1266
1267 /*
1268 * If removing the interface that gave the bridge its mac address, set
1269 * the mac address of the bridge to the address of the next member, or
1270 * to its default address if no members are left.
1271 */
1272 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1273 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1274 bcopy(&sc->sc_defaddr,
1275 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1276 sc->sc_ifaddr = NULL;
1277 } else {
1278 bifl = CK_LIST_FIRST(&sc->sc_iflist);
1279 fif = bifl->bif_ifp;
1280 bcopy(IF_LLADDR(fif),
1281 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1282 sc->sc_ifaddr = fif;
1283 }
1284 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1285 }
1286
1287 bridge_linkcheck(sc);
1288 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1289 BRIDGE_RT_LOCK(sc);
1290 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1291 BRIDGE_RT_UNLOCK(sc);
1292 KASSERT(bif->bif_addrcnt == 0,
1293 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1294
1295 ifs->if_bridge_output = NULL;
1296 ifs->if_bridge_input = NULL;
1297 ifs->if_bridge_linkstate = NULL;
1298 if (!gone) {
1299 switch (ifs->if_type) {
1300 case IFT_ETHER:
1301 case IFT_L2VLAN:
1302 /*
1303 * Take the interface out of promiscuous mode, but only
1304 * if it was promiscuous in the first place. It might
1305 * not be if we're in the bridge_ioctl_add() error path.
1306 */
1307 if (ifs->if_flags & IFF_PROMISC)
1308 (void) ifpromisc(ifs, 0);
1309 break;
1310
1311 case IFT_GIF:
1312 break;
1313
1314 default:
1315 #ifdef DIAGNOSTIC
1316 panic("bridge_delete_member: impossible");
1317 #endif
1318 break;
1319 }
1320 /* Re-enable any interface capabilities */
1321 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1322 }
1323 bstp_destroy(&bif->bif_stp); /* prepare to free */
1324
1325 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1326 }
1327
1328 /*
1329 * bridge_delete_span:
1330 *
1331 * Delete the specified span interface.
1332 */
1333 static void
bridge_delete_span(struct bridge_softc * sc,struct bridge_iflist * bif)1334 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1335 {
1336 BRIDGE_LOCK_ASSERT(sc);
1337
1338 KASSERT(bif->bif_ifp->if_bridge == NULL,
1339 ("%s: not a span interface", __func__));
1340
1341 CK_LIST_REMOVE(bif, bif_next);
1342
1343 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1344 }
1345
1346 static int
bridge_ioctl_add(struct bridge_softc * sc,void * arg)1347 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1348 {
1349 struct ifbreq *req = arg;
1350 struct bridge_iflist *bif = NULL;
1351 struct ifnet *ifs;
1352 int error = 0;
1353
1354 ifs = ifunit(req->ifbr_ifsname);
1355 if (ifs == NULL)
1356 return (EXTERROR(ENOENT, "No such interface",
1357 req->ifbr_ifsname));
1358 if (ifs->if_ioctl == NULL) /* must be supported */
1359 return (EXTERROR(EINVAL, "Interface must support ioctl(2)"));
1360
1361 /*
1362 * If the new interface is a vlan(4), it could be a bridge SVI.
1363 * Don't allow such things to be added to bridges.
1364 */
1365 if (ifs->if_type == IFT_L2VLAN) {
1366 struct ifnet *parent;
1367 struct epoch_tracker et;
1368 bool is_bridge;
1369
1370 /*
1371 * Entering NET_EPOCH with BRIDGE_LOCK held, but this is okay
1372 * since we don't sleep here.
1373 */
1374 NET_EPOCH_ENTER(et);
1375 parent = VLAN_TRUNKDEV(ifs);
1376 is_bridge = (parent != NULL && parent->if_type == IFT_BRIDGE);
1377 NET_EPOCH_EXIT(et);
1378
1379 if (is_bridge)
1380 return (EXTERROR(EINVAL,
1381 "Bridge SVI cannot be added to a bridge"));
1382 }
1383
1384 /* If it's in the span list, it can't be a member. */
1385 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1386 if (ifs == bif->bif_ifp)
1387 return (EXTERROR(EBUSY,
1388 "Span interface cannot be a member"));
1389
1390 if (ifs->if_bridge) {
1391 struct bridge_iflist *sbif = ifs->if_bridge;
1392 if (sbif->bif_sc == sc)
1393 return (EXTERROR(EEXIST,
1394 "Interface is already a member of this bridge"));
1395
1396 return (EXTERROR(EBUSY,
1397 "Interface is already a member of another bridge"));
1398 }
1399
1400 switch (ifs->if_type) {
1401 case IFT_ETHER:
1402 case IFT_L2VLAN:
1403 case IFT_GIF:
1404 /* permitted interface types */
1405 break;
1406 default:
1407 return (EXTERROR(EINVAL, "Unsupported interface type"));
1408 }
1409
1410 #ifdef INET6
1411 /*
1412 * Two valid inet6 addresses with link-local scope must not be
1413 * on the parent interface and the member interfaces at the
1414 * same time. This restriction is needed to prevent violation
1415 * of link-local scope zone. Attempts to add a member
1416 * interface which has inet6 addresses when the parent has
1417 * inet6 triggers removal of all inet6 addresses on the member
1418 * interface.
1419 */
1420
1421 /* Check if the parent interface has a link-local scope addr. */
1422 if (V_allow_llz_overlap == 0 &&
1423 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1424 /*
1425 * If any, remove all inet6 addresses from the member
1426 * interfaces.
1427 */
1428 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1429 if (in6ifa_llaonifp(bif->bif_ifp)) {
1430 in6_ifdetach(bif->bif_ifp);
1431 if_printf(sc->sc_ifp,
1432 "IPv6 addresses on %s have been removed "
1433 "before adding it as a member to prevent "
1434 "IPv6 address scope violation.\n",
1435 bif->bif_ifp->if_xname);
1436 }
1437 }
1438 if (in6ifa_llaonifp(ifs)) {
1439 in6_ifdetach(ifs);
1440 if_printf(sc->sc_ifp,
1441 "IPv6 addresses on %s have been removed "
1442 "before adding it as a member to prevent "
1443 "IPv6 address scope violation.\n",
1444 ifs->if_xname);
1445 }
1446 }
1447 #endif
1448
1449 /*
1450 * If member_ifaddrs is disabled, do not allow an interface with
1451 * assigned IP addresses to be added to a bridge. Skip this check
1452 * for gif interfaces, because the IP address assigned to a gif
1453 * interface is separate from the bridge's Ethernet segment.
1454 */
1455 if (ifs->if_type != IFT_GIF) {
1456 struct ifaddr *ifa;
1457
1458 CK_STAILQ_FOREACH(ifa, &ifs->if_addrhead, ifa_link) {
1459 if (ifa->ifa_addr->sa_family != AF_INET &&
1460 ifa->ifa_addr->sa_family != AF_INET6)
1461 continue;
1462
1463 if (V_member_ifaddrs) {
1464 if_printf(sc->sc_ifp,
1465 "WARNING: Adding member interface %s which "
1466 "has an IP address assigned is deprecated "
1467 "and will be unsupported in a future "
1468 "release.\n", ifs->if_xname);
1469 break;
1470 } else {
1471 return (EXTERROR(EINVAL,
1472 "Member interface may not have "
1473 "an IP address assigned"));
1474 }
1475 }
1476 }
1477
1478 /* Allow the first Ethernet member to define the MTU */
1479 if (CK_LIST_EMPTY(&sc->sc_iflist))
1480 sc->sc_ifp->if_mtu = ifs->if_mtu;
1481 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1482 struct ifreq ifr;
1483
1484 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s",
1485 ifs->if_xname);
1486 ifr.ifr_mtu = sc->sc_ifp->if_mtu;
1487
1488 error = (*ifs->if_ioctl)(ifs,
1489 SIOCSIFMTU, (caddr_t)&ifr);
1490 if (error != 0) {
1491 log(LOG_NOTICE, "%s: invalid MTU: %u for"
1492 " new member %s\n", sc->sc_ifp->if_xname,
1493 ifr.ifr_mtu,
1494 ifs->if_xname);
1495 return (EXTERROR(EINVAL,
1496 "Failed to set MTU on new member"));
1497 }
1498 }
1499
1500 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1501 if (bif == NULL)
1502 return (ENOMEM);
1503
1504 bif->bif_sc = sc;
1505 bif->bif_ifp = ifs;
1506 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1507 bif->bif_savedcaps = ifs->if_capenable;
1508 bif->bif_vlanproto = ETHERTYPE_VLAN;
1509 bif->bif_pvid = sc->sc_defpvid;
1510 if (sc->sc_flags & IFBRF_DEFQINQ)
1511 bif->bif_flags |= IFBIF_QINQ;
1512
1513 /*
1514 * Assign the interface's MAC address to the bridge if it's the first
1515 * member and the MAC address of the bridge has not been changed from
1516 * the default randomly generated one.
1517 */
1518 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1519 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1520 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1521 sc->sc_ifaddr = ifs;
1522 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1523 }
1524
1525 ifs->if_bridge = bif;
1526 ifs->if_bridge_output = bridge_output;
1527 ifs->if_bridge_input = bridge_input;
1528 ifs->if_bridge_linkstate = bridge_linkstate;
1529 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1530 /*
1531 * XXX: XLOCK HERE!?!
1532 *
1533 * NOTE: insert_***HEAD*** should be safe for the traversals.
1534 */
1535 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1536
1537 /* Set interface capabilities to the intersection set of all members */
1538 bridge_mutecaps(sc);
1539 bridge_linkcheck(sc);
1540
1541 /* Place the interface into promiscuous mode */
1542 switch (ifs->if_type) {
1543 case IFT_ETHER:
1544 case IFT_L2VLAN:
1545 error = ifpromisc(ifs, 1);
1546 break;
1547 }
1548
1549 if (error)
1550 bridge_delete_member(sc, bif, 0);
1551 return (error);
1552 }
1553
1554 static int
bridge_ioctl_del(struct bridge_softc * sc,void * arg)1555 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1556 {
1557 struct ifbreq *req = arg;
1558 struct bridge_iflist *bif;
1559
1560 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1561 if (bif == NULL)
1562 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1563
1564 bridge_delete_member(sc, bif, 0);
1565
1566 return (0);
1567 }
1568
1569 static int
bridge_ioctl_gifflags(struct bridge_softc * sc,void * arg)1570 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1571 {
1572 struct ifbreq *req = arg;
1573 struct bridge_iflist *bif;
1574 struct bstp_port *bp;
1575
1576 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1577 if (bif == NULL)
1578 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1579
1580 bp = &bif->bif_stp;
1581 req->ifbr_ifsflags = bif->bif_flags;
1582 req->ifbr_state = bp->bp_state;
1583 req->ifbr_priority = bp->bp_priority;
1584 req->ifbr_path_cost = bp->bp_path_cost;
1585 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1586 req->ifbr_proto = bp->bp_protover;
1587 req->ifbr_role = bp->bp_role;
1588 req->ifbr_stpflags = bp->bp_flags;
1589 req->ifbr_addrcnt = bif->bif_addrcnt;
1590 req->ifbr_addrmax = bif->bif_addrmax;
1591 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1592 req->ifbr_pvid = bif->bif_pvid;
1593 req->ifbr_vlanproto = bif->bif_vlanproto;
1594
1595 /* Copy STP state options as flags */
1596 if (bp->bp_operedge)
1597 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1598 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1599 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1600 if (bp->bp_ptp_link)
1601 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1602 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1603 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1604 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1605 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1606 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1607 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1608 return (0);
1609 }
1610
1611 static int
bridge_ioctl_sifflags(struct bridge_softc * sc,void * arg)1612 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1613 {
1614 struct epoch_tracker et;
1615 struct ifbreq *req = arg;
1616 struct bridge_iflist *bif;
1617 struct bstp_port *bp;
1618 int error;
1619
1620 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1621 if (bif == NULL)
1622 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1623 bp = &bif->bif_stp;
1624
1625 if (req->ifbr_ifsflags & IFBIF_SPAN)
1626 /* SPAN is readonly */
1627 return (EXTERROR(EINVAL, "Span interface cannot be modified"));
1628
1629 NET_EPOCH_ENTER(et);
1630
1631 if (req->ifbr_ifsflags & IFBIF_STP) {
1632 if ((bif->bif_flags & IFBIF_STP) == 0) {
1633 error = bstp_enable(&bif->bif_stp);
1634 if (error) {
1635 NET_EPOCH_EXIT(et);
1636 return (EXTERROR(error,
1637 "Failed to enable STP"));
1638 }
1639 }
1640 } else {
1641 if ((bif->bif_flags & IFBIF_STP) != 0)
1642 bstp_disable(&bif->bif_stp);
1643 }
1644
1645 /* Pass on STP flags */
1646 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1647 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1648 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1649 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1650
1651 /* Save the bits relating to the bridge */
1652 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1653
1654 NET_EPOCH_EXIT(et);
1655
1656 return (0);
1657 }
1658
1659 static int
bridge_ioctl_scache(struct bridge_softc * sc,void * arg)1660 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1661 {
1662 struct ifbrparam *param = arg;
1663
1664 sc->sc_brtmax = param->ifbrp_csize;
1665 bridge_rttrim(sc);
1666
1667 return (0);
1668 }
1669
1670 static int
bridge_ioctl_gcache(struct bridge_softc * sc,void * arg)1671 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1672 {
1673 struct ifbrparam *param = arg;
1674
1675 param->ifbrp_csize = sc->sc_brtmax;
1676
1677 return (0);
1678 }
1679
1680 static int
bridge_ioctl_gifs(struct bridge_softc * sc,void * arg)1681 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1682 {
1683 struct ifbifconf *bifc = arg;
1684 struct bridge_iflist *bif;
1685 struct ifbreq breq;
1686 char *buf, *outbuf;
1687 int count, buflen, len, error = 0;
1688
1689 count = 0;
1690 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1691 count++;
1692 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1693 count++;
1694
1695 buflen = sizeof(breq) * count;
1696 if (bifc->ifbic_len == 0) {
1697 bifc->ifbic_len = buflen;
1698 return (0);
1699 }
1700 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1701 if (outbuf == NULL)
1702 return (ENOMEM);
1703
1704 count = 0;
1705 buf = outbuf;
1706 len = min(bifc->ifbic_len, buflen);
1707 bzero(&breq, sizeof(breq));
1708 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1709 if (len < sizeof(breq))
1710 break;
1711
1712 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1713 sizeof(breq.ifbr_ifsname));
1714 /* Fill in the ifbreq structure */
1715 error = bridge_ioctl_gifflags(sc, &breq);
1716 if (error)
1717 break;
1718 memcpy(buf, &breq, sizeof(breq));
1719 count++;
1720 buf += sizeof(breq);
1721 len -= sizeof(breq);
1722 }
1723 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1724 if (len < sizeof(breq))
1725 break;
1726
1727 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1728 sizeof(breq.ifbr_ifsname));
1729 breq.ifbr_ifsflags = bif->bif_flags;
1730 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1731 memcpy(buf, &breq, sizeof(breq));
1732 count++;
1733 buf += sizeof(breq);
1734 len -= sizeof(breq);
1735 }
1736
1737 bifc->ifbic_len = sizeof(breq) * count;
1738 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1739 free(outbuf, M_TEMP);
1740 return (error);
1741 }
1742
1743 static int
bridge_ioctl_rts(struct bridge_softc * sc,void * arg)1744 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1745 {
1746 struct ifbaconf *bac = arg;
1747 struct bridge_rtnode *brt;
1748 struct ifbareq bareq;
1749 char *buf, *outbuf;
1750 int count, buflen, len, error = 0;
1751
1752 if (bac->ifbac_len == 0)
1753 return (0);
1754
1755 count = 0;
1756 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1757 count++;
1758 buflen = sizeof(bareq) * count;
1759
1760 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1761 if (outbuf == NULL)
1762 return (ENOMEM);
1763
1764 count = 0;
1765 buf = outbuf;
1766 len = min(bac->ifbac_len, buflen);
1767 bzero(&bareq, sizeof(bareq));
1768 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1769 if (len < sizeof(bareq))
1770 goto out;
1771 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1772 sizeof(bareq.ifba_ifsname));
1773 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1774 bareq.ifba_vlan = brt->brt_vlan;
1775 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1776 time_uptime < brt->brt_expire)
1777 bareq.ifba_expire = brt->brt_expire - time_uptime;
1778 else
1779 bareq.ifba_expire = 0;
1780 bareq.ifba_flags = brt->brt_flags;
1781
1782 memcpy(buf, &bareq, sizeof(bareq));
1783 count++;
1784 buf += sizeof(bareq);
1785 len -= sizeof(bareq);
1786 }
1787 out:
1788 bac->ifbac_len = sizeof(bareq) * count;
1789 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1790 free(outbuf, M_TEMP);
1791 return (error);
1792 }
1793
1794 static int
bridge_ioctl_saddr(struct bridge_softc * sc,void * arg)1795 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1796 {
1797 struct ifbareq *req = arg;
1798 struct bridge_iflist *bif;
1799 struct epoch_tracker et;
1800 int error;
1801
1802 NET_EPOCH_ENTER(et);
1803 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1804 if (bif == NULL) {
1805 NET_EPOCH_EXIT(et);
1806 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1807 }
1808
1809 /* bridge_rtupdate() may acquire the lock. */
1810 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1811 req->ifba_flags);
1812 NET_EPOCH_EXIT(et);
1813
1814 return (error);
1815 }
1816
1817 static int
bridge_ioctl_sto(struct bridge_softc * sc,void * arg)1818 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1819 {
1820 struct ifbrparam *param = arg;
1821
1822 sc->sc_brttimeout = param->ifbrp_ctime;
1823 return (0);
1824 }
1825
1826 static int
bridge_ioctl_gto(struct bridge_softc * sc,void * arg)1827 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1828 {
1829 struct ifbrparam *param = arg;
1830
1831 param->ifbrp_ctime = sc->sc_brttimeout;
1832 return (0);
1833 }
1834
1835 static int
bridge_ioctl_daddr(struct bridge_softc * sc,void * arg)1836 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1837 {
1838 struct ifbareq *req = arg;
1839 int vlan = req->ifba_vlan;
1840
1841 /* Userspace uses '0' to mean 'any vlan' */
1842 if (vlan == 0)
1843 vlan = DOT1Q_VID_RSVD_IMPL;
1844
1845 return (bridge_rtdaddr(sc, req->ifba_dst, vlan));
1846 }
1847
1848 static int
bridge_ioctl_flush(struct bridge_softc * sc,void * arg)1849 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1850 {
1851 struct ifbreq *req = arg;
1852
1853 BRIDGE_RT_LOCK(sc);
1854 bridge_rtflush(sc, req->ifbr_ifsflags);
1855 BRIDGE_RT_UNLOCK(sc);
1856
1857 return (0);
1858 }
1859
1860 static int
bridge_ioctl_gpri(struct bridge_softc * sc,void * arg)1861 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1862 {
1863 struct ifbrparam *param = arg;
1864 struct bstp_state *bs = &sc->sc_stp;
1865
1866 param->ifbrp_prio = bs->bs_bridge_priority;
1867 return (0);
1868 }
1869
1870 static int
bridge_ioctl_spri(struct bridge_softc * sc,void * arg)1871 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1872 {
1873 struct ifbrparam *param = arg;
1874
1875 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1876 }
1877
1878 static int
bridge_ioctl_ght(struct bridge_softc * sc,void * arg)1879 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1880 {
1881 struct ifbrparam *param = arg;
1882 struct bstp_state *bs = &sc->sc_stp;
1883
1884 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1885 return (0);
1886 }
1887
1888 static int
bridge_ioctl_sht(struct bridge_softc * sc,void * arg)1889 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1890 {
1891 struct ifbrparam *param = arg;
1892
1893 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1894 }
1895
1896 static int
bridge_ioctl_gfd(struct bridge_softc * sc,void * arg)1897 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1898 {
1899 struct ifbrparam *param = arg;
1900 struct bstp_state *bs = &sc->sc_stp;
1901
1902 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1903 return (0);
1904 }
1905
1906 static int
bridge_ioctl_sfd(struct bridge_softc * sc,void * arg)1907 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1908 {
1909 struct ifbrparam *param = arg;
1910
1911 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1912 }
1913
1914 static int
bridge_ioctl_gma(struct bridge_softc * sc,void * arg)1915 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1916 {
1917 struct ifbrparam *param = arg;
1918 struct bstp_state *bs = &sc->sc_stp;
1919
1920 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1921 return (0);
1922 }
1923
1924 static int
bridge_ioctl_sma(struct bridge_softc * sc,void * arg)1925 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1926 {
1927 struct ifbrparam *param = arg;
1928
1929 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1930 }
1931
1932 static int
bridge_ioctl_sifprio(struct bridge_softc * sc,void * arg)1933 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1934 {
1935 struct ifbreq *req = arg;
1936 struct bridge_iflist *bif;
1937
1938 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1939 if (bif == NULL)
1940 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1941
1942 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1943 }
1944
1945 static int
bridge_ioctl_sifcost(struct bridge_softc * sc,void * arg)1946 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1947 {
1948 struct ifbreq *req = arg;
1949 struct bridge_iflist *bif;
1950
1951 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1952 if (bif == NULL)
1953 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1954
1955 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1956 }
1957
1958 static int
bridge_ioctl_sifmaxaddr(struct bridge_softc * sc,void * arg)1959 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1960 {
1961 struct ifbreq *req = arg;
1962 struct bridge_iflist *bif;
1963
1964 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1965 if (bif == NULL)
1966 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1967
1968 bif->bif_addrmax = req->ifbr_addrmax;
1969 return (0);
1970 }
1971
1972 static int
bridge_ioctl_sifpvid(struct bridge_softc * sc,void * arg)1973 bridge_ioctl_sifpvid(struct bridge_softc *sc, void *arg)
1974 {
1975 struct ifbreq *req = arg;
1976 struct bridge_iflist *bif;
1977
1978 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1979 if (bif == NULL)
1980 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
1981
1982 if (req->ifbr_pvid > DOT1Q_VID_MAX)
1983 return (EXTERROR(EINVAL, "Invalid VLAN ID"));
1984
1985 bif->bif_pvid = req->ifbr_pvid;
1986 return (0);
1987 }
1988
1989 static int
bridge_ioctl_sifvlanset(struct bridge_softc * sc,void * arg)1990 bridge_ioctl_sifvlanset(struct bridge_softc *sc, void *arg)
1991 {
1992 struct ifbif_vlan_req *req = arg;
1993 struct bridge_iflist *bif;
1994
1995 if ((sc->sc_flags & IFBRF_VLANFILTER) == 0)
1996 return (EXTERROR(EINVAL, "VLAN filtering not enabled"));
1997
1998 bif = bridge_lookup_member(sc, req->bv_ifname);
1999 if (bif == NULL)
2000 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
2001
2002 /* Reject invalid VIDs. */
2003 if (BRVLAN_TEST(&req->bv_set, DOT1Q_VID_NULL) ||
2004 BRVLAN_TEST(&req->bv_set, DOT1Q_VID_RSVD_IMPL))
2005 return (EXTERROR(EINVAL, "Invalid VLAN ID in set"));
2006
2007 switch (req->bv_op) {
2008 /* Replace the existing vlan set with the new set */
2009 case BRDG_VLAN_OP_SET:
2010 BIT_COPY(BRVLAN_SETSIZE, &req->bv_set, &bif->bif_vlan_set);
2011 break;
2012
2013 /* Modify the existing vlan set to add the given vlans */
2014 case BRDG_VLAN_OP_ADD:
2015 BIT_OR(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set);
2016 break;
2017
2018 /* Modify the existing vlan set to remove the given vlans */
2019 case BRDG_VLAN_OP_DEL:
2020 BIT_ANDNOT(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set);
2021 break;
2022
2023 /* Invalid or unknown operation */
2024 default:
2025 return (EXTERROR(EINVAL,
2026 "Unsupported BRDGSIFVLANSET operation"));
2027 }
2028
2029 return (0);
2030 }
2031
2032 static int
bridge_ioctl_gifvlanset(struct bridge_softc * sc,void * arg)2033 bridge_ioctl_gifvlanset(struct bridge_softc *sc, void *arg)
2034 {
2035 struct ifbif_vlan_req *req = arg;
2036 struct bridge_iflist *bif;
2037
2038 bif = bridge_lookup_member(sc, req->bv_ifname);
2039 if (bif == NULL)
2040 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
2041
2042 BIT_COPY(BRVLAN_SETSIZE, &bif->bif_vlan_set, &req->bv_set);
2043 return (0);
2044 }
2045
2046 static int
bridge_ioctl_addspan(struct bridge_softc * sc,void * arg)2047 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
2048 {
2049 struct ifbreq *req = arg;
2050 struct bridge_iflist *bif = NULL;
2051 struct ifnet *ifs;
2052
2053 ifs = ifunit(req->ifbr_ifsname);
2054 if (ifs == NULL)
2055 return (EXTERROR(ENOENT, "No such interface"));
2056
2057 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
2058 if (ifs == bif->bif_ifp)
2059 return (EXTERROR(EBUSY,
2060 "Interface is already a span port"));
2061
2062 if (ifs->if_bridge != NULL)
2063 return (EXTERROR(EEXIST,
2064 "Interface is already a bridge member"));
2065
2066 switch (ifs->if_type) {
2067 case IFT_ETHER:
2068 case IFT_GIF:
2069 case IFT_L2VLAN:
2070 break;
2071 default:
2072 return (EXTERROR(EINVAL, "Unsupported interface type"));
2073 }
2074
2075 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
2076 if (bif == NULL)
2077 return (ENOMEM);
2078
2079 bif->bif_ifp = ifs;
2080 bif->bif_flags = IFBIF_SPAN;
2081
2082 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
2083
2084 return (0);
2085 }
2086
2087 static int
bridge_ioctl_delspan(struct bridge_softc * sc,void * arg)2088 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
2089 {
2090 struct ifbreq *req = arg;
2091 struct bridge_iflist *bif;
2092 struct ifnet *ifs;
2093
2094 ifs = ifunit(req->ifbr_ifsname);
2095 if (ifs == NULL)
2096 return (EXTERROR(ENOENT, "No such interface"));
2097
2098 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
2099 if (ifs == bif->bif_ifp)
2100 break;
2101
2102 if (bif == NULL)
2103 return (EXTERROR(ENOENT, "Interface is not a span port"));
2104
2105 bridge_delete_span(sc, bif);
2106
2107 return (0);
2108 }
2109
2110 static int
bridge_ioctl_gbparam(struct bridge_softc * sc,void * arg)2111 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
2112 {
2113 struct ifbropreq *req = arg;
2114 struct bstp_state *bs = &sc->sc_stp;
2115 struct bstp_port *root_port;
2116
2117 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
2118 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
2119 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
2120
2121 root_port = bs->bs_root_port;
2122 if (root_port == NULL)
2123 req->ifbop_root_port = 0;
2124 else
2125 req->ifbop_root_port = root_port->bp_ifp->if_index;
2126
2127 req->ifbop_holdcount = bs->bs_txholdcount;
2128 req->ifbop_priority = bs->bs_bridge_priority;
2129 req->ifbop_protocol = bs->bs_protover;
2130 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
2131 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
2132 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
2133 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
2134 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
2135 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
2136
2137 return (0);
2138 }
2139
2140 static int
bridge_ioctl_grte(struct bridge_softc * sc,void * arg)2141 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
2142 {
2143 struct ifbrparam *param = arg;
2144
2145 param->ifbrp_cexceeded = sc->sc_brtexceeded;
2146 return (0);
2147 }
2148
2149 static int
bridge_ioctl_gifsstp(struct bridge_softc * sc,void * arg)2150 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
2151 {
2152 struct ifbpstpconf *bifstp = arg;
2153 struct bridge_iflist *bif;
2154 struct bstp_port *bp;
2155 struct ifbpstpreq bpreq;
2156 char *buf, *outbuf;
2157 int count, buflen, len, error = 0;
2158
2159 count = 0;
2160 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2161 if ((bif->bif_flags & IFBIF_STP) != 0)
2162 count++;
2163 }
2164
2165 buflen = sizeof(bpreq) * count;
2166 if (bifstp->ifbpstp_len == 0) {
2167 bifstp->ifbpstp_len = buflen;
2168 return (0);
2169 }
2170
2171 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
2172 if (outbuf == NULL)
2173 return (ENOMEM);
2174
2175 count = 0;
2176 buf = outbuf;
2177 len = min(bifstp->ifbpstp_len, buflen);
2178 bzero(&bpreq, sizeof(bpreq));
2179 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2180 if (len < sizeof(bpreq))
2181 break;
2182
2183 if ((bif->bif_flags & IFBIF_STP) == 0)
2184 continue;
2185
2186 bp = &bif->bif_stp;
2187 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
2188 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
2189 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
2190 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
2191 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
2192 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
2193
2194 memcpy(buf, &bpreq, sizeof(bpreq));
2195 count++;
2196 buf += sizeof(bpreq);
2197 len -= sizeof(bpreq);
2198 }
2199
2200 bifstp->ifbpstp_len = sizeof(bpreq) * count;
2201 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
2202 free(outbuf, M_TEMP);
2203 return (error);
2204 }
2205
2206 static int
bridge_ioctl_sproto(struct bridge_softc * sc,void * arg)2207 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
2208 {
2209 struct ifbrparam *param = arg;
2210
2211 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
2212 }
2213
2214 static int
bridge_ioctl_stxhc(struct bridge_softc * sc,void * arg)2215 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
2216 {
2217 struct ifbrparam *param = arg;
2218
2219 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
2220 }
2221
2222 static int
bridge_ioctl_gflags(struct bridge_softc * sc,void * arg)2223 bridge_ioctl_gflags(struct bridge_softc *sc, void *arg)
2224 {
2225 struct ifbrparam *param = arg;
2226
2227 param->ifbrp_flags = sc->sc_flags;
2228
2229 return (0);
2230 }
2231
2232 static int
bridge_ioctl_sflags(struct bridge_softc * sc,void * arg)2233 bridge_ioctl_sflags(struct bridge_softc *sc, void *arg)
2234 {
2235 struct ifbrparam *param = arg;
2236
2237 sc->sc_flags = param->ifbrp_flags;
2238
2239 return (0);
2240 }
2241
2242 static int
bridge_ioctl_gdefpvid(struct bridge_softc * sc,void * arg)2243 bridge_ioctl_gdefpvid(struct bridge_softc *sc, void *arg)
2244 {
2245 struct ifbrparam *param = arg;
2246
2247 param->ifbrp_defpvid = sc->sc_defpvid;
2248
2249 return (0);
2250 }
2251
2252 static int
bridge_ioctl_sdefpvid(struct bridge_softc * sc,void * arg)2253 bridge_ioctl_sdefpvid(struct bridge_softc *sc, void *arg)
2254 {
2255 struct ifbrparam *param = arg;
2256
2257 /* Reject invalid VIDs, but allow 0 to mean 'none'. */
2258 if (param->ifbrp_defpvid > DOT1Q_VID_MAX)
2259 return (EINVAL);
2260
2261 sc->sc_defpvid = param->ifbrp_defpvid;
2262
2263 return (0);
2264 }
2265
2266 static int
bridge_ioctl_svlanproto(struct bridge_softc * sc,void * arg)2267 bridge_ioctl_svlanproto(struct bridge_softc *sc, void *arg)
2268 {
2269 struct ifbreq *req = arg;
2270 struct bridge_iflist *bif;
2271
2272 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
2273 if (bif == NULL)
2274 return (EXTERROR(ENOENT, "Interface is not a bridge member"));
2275
2276 if (req->ifbr_vlanproto != ETHERTYPE_VLAN &&
2277 req->ifbr_vlanproto != ETHERTYPE_QINQ)
2278 return (EXTERROR(EINVAL, "Invalid VLAN protocol"));
2279
2280 bif->bif_vlanproto = req->ifbr_vlanproto;
2281
2282 return (0);
2283 }
2284 /*
2285 * bridge_ifdetach:
2286 *
2287 * Detach an interface from a bridge. Called when a member
2288 * interface is detaching.
2289 */
2290 static void
bridge_ifdetach(void * arg __unused,struct ifnet * ifp)2291 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
2292 {
2293 struct bridge_iflist *bif = ifp->if_bridge;
2294 struct bridge_softc *sc = NULL;
2295
2296 if (bif)
2297 sc = bif->bif_sc;
2298
2299 if (ifp->if_flags & IFF_RENAMING)
2300 return;
2301 if (V_bridge_cloner == NULL) {
2302 /*
2303 * This detach handler can be called after
2304 * vnet_bridge_uninit(). Just return in that case.
2305 */
2306 return;
2307 }
2308 /* Check if the interface is a bridge member */
2309 if (sc != NULL) {
2310 BRIDGE_LOCK(sc);
2311 bridge_delete_member(sc, bif, 1);
2312 BRIDGE_UNLOCK(sc);
2313 return;
2314 }
2315
2316 /* Check if the interface is a span port */
2317 BRIDGE_LIST_LOCK();
2318 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
2319 BRIDGE_LOCK(sc);
2320 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
2321 if (ifp == bif->bif_ifp) {
2322 bridge_delete_span(sc, bif);
2323 break;
2324 }
2325
2326 BRIDGE_UNLOCK(sc);
2327 }
2328 BRIDGE_LIST_UNLOCK();
2329 }
2330
2331 /*
2332 * bridge_init:
2333 *
2334 * Initialize a bridge interface.
2335 */
2336 static void
bridge_init(void * xsc)2337 bridge_init(void *xsc)
2338 {
2339 struct bridge_softc *sc = (struct bridge_softc *)xsc;
2340 struct ifnet *ifp = sc->sc_ifp;
2341
2342 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
2343 return;
2344
2345 BRIDGE_LOCK(sc);
2346 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
2347 bridge_timer, sc);
2348
2349 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2350 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
2351
2352 BRIDGE_UNLOCK(sc);
2353 }
2354
2355 /*
2356 * bridge_stop:
2357 *
2358 * Stop the bridge interface.
2359 */
2360 static void
bridge_stop(struct ifnet * ifp,int disable)2361 bridge_stop(struct ifnet *ifp, int disable)
2362 {
2363 struct bridge_softc *sc = ifp->if_softc;
2364
2365 BRIDGE_LOCK_ASSERT(sc);
2366
2367 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2368 return;
2369
2370 BRIDGE_RT_LOCK(sc);
2371 callout_stop(&sc->sc_brcallout);
2372
2373 bstp_stop(&sc->sc_stp);
2374
2375 bridge_rtflush(sc, IFBF_FLUSHDYN);
2376 BRIDGE_RT_UNLOCK(sc);
2377
2378 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2379 }
2380
2381 /*
2382 * bridge_enqueue:
2383 *
2384 * Enqueue a packet on a bridge member interface.
2385 *
2386 */
2387 static int
bridge_enqueue(struct bridge_softc * sc,struct ifnet * dst_ifp,struct mbuf * m,struct bridge_iflist * bif)2388 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m,
2389 struct bridge_iflist *bif)
2390 {
2391 int len, err = 0;
2392 short mflags;
2393 struct mbuf *m0;
2394
2395 /*
2396 * Find the bridge member port this packet is being sent on, if the
2397 * caller didn't already provide it.
2398 */
2399 if (bif == NULL)
2400 bif = bridge_lookup_member_if(sc, dst_ifp);
2401 if (bif == NULL) {
2402 /* Perhaps the interface was removed from the bridge */
2403 m_freem(m);
2404 return (EINVAL);
2405 }
2406
2407 /* Do VLAN filtering. */
2408 if (!bridge_vfilter_out(bif, m)) {
2409 m_freem(m);
2410 return (0);
2411 }
2412
2413 /* We may be sending a fragment so traverse the mbuf */
2414 for (; m; m = m0) {
2415 m0 = m->m_nextpkt;
2416 m->m_nextpkt = NULL;
2417 len = m->m_pkthdr.len;
2418 mflags = m->m_flags;
2419
2420 /*
2421 * If the native VLAN ID of the outgoing interface matches the
2422 * VLAN ID of the frame, remove the VLAN tag.
2423 */
2424 if (bif->bif_pvid != DOT1Q_VID_NULL &&
2425 VLANTAGOF(m) == bif->bif_pvid) {
2426 m->m_flags &= ~M_VLANTAG;
2427 m->m_pkthdr.ether_vtag = 0;
2428 }
2429
2430 /*
2431 * There are two cases where we have to insert our own tag:
2432 * if the member interface doesn't support hardware tagging,
2433 * or if the tag proto is not 802.1q.
2434 */
2435 if ((m->m_flags & M_VLANTAG) &&
2436 ((dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0 ||
2437 bif->bif_vlanproto != ETHERTYPE_VLAN)) {
2438 m = ether_vlanencap_proto(m, m->m_pkthdr.ether_vtag,
2439 bif->bif_vlanproto);
2440 if (m == NULL) {
2441 if_printf(dst_ifp,
2442 "unable to prepend VLAN header\n");
2443 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
2444 continue;
2445 }
2446 m->m_flags &= ~M_VLANTAG;
2447 }
2448
2449 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
2450 /*
2451 * XXXZL: gif(4) requires the af to be saved in csum_data field
2452 * so that gif_transmit() routine can pull it back.
2453 */
2454 if (dst_ifp->if_type == IFT_GIF)
2455 m->m_pkthdr.csum_data = AF_LINK;
2456 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
2457 int n;
2458
2459 for (m = m0, n = 1; m != NULL; m = m0, n++) {
2460 m0 = m->m_nextpkt;
2461 m_freem(m);
2462 }
2463 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n);
2464 break;
2465 }
2466
2467 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2468 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2469 if (mflags & M_MCAST)
2470 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2471 }
2472
2473 return (err);
2474 }
2475
2476 /*
2477 * bridge_dummynet:
2478 *
2479 * Receive a queued packet from dummynet and pass it on to the output
2480 * interface.
2481 *
2482 * The mbuf has the Ethernet header already attached.
2483 */
2484 static void
bridge_dummynet(struct mbuf * m,struct ifnet * ifp)2485 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2486 {
2487 struct bridge_iflist *bif = ifp->if_bridge;
2488 struct bridge_softc *sc = NULL;
2489
2490 if (bif)
2491 sc = bif->bif_sc;
2492
2493 /*
2494 * The packet didnt originate from a member interface. This should only
2495 * ever happen if a member interface is removed while packets are
2496 * queued for it.
2497 */
2498 if (sc == NULL) {
2499 m_freem(m);
2500 return;
2501 }
2502
2503 if (PFIL_HOOKED_OUT_46) {
2504 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2505 return;
2506 if (m == NULL)
2507 return;
2508 }
2509
2510 bridge_enqueue(sc, ifp, m, NULL);
2511 }
2512
2513 /*
2514 * bridge_output:
2515 *
2516 * Send output from a bridge member interface. This
2517 * performs the bridging function for locally originated
2518 * packets.
2519 *
2520 * The mbuf has the Ethernet header already attached. We must
2521 * enqueue or free the mbuf before returning.
2522 */
2523 static int
bridge_output(struct ifnet * ifp,struct mbuf * m,struct sockaddr * sa,struct rtentry * rt)2524 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2525 struct rtentry *rt)
2526 {
2527 struct ether_header *eh;
2528 struct bridge_iflist *sbif;
2529 struct ifnet *bifp, *dst_if;
2530 struct bridge_softc *sc;
2531 ether_vlanid_t vlan;
2532
2533 NET_EPOCH_ASSERT();
2534
2535 if (m->m_len < ETHER_HDR_LEN) {
2536 m = m_pullup(m, ETHER_HDR_LEN);
2537 if (m == NULL)
2538 return (0);
2539 }
2540
2541 sbif = ifp->if_bridge;
2542 sc = sbif->bif_sc;
2543 bifp = sc->sc_ifp;
2544
2545 eh = mtod(m, struct ether_header *);
2546 vlan = VLANTAGOF(m);
2547
2548 /*
2549 * If bridge is down, but the original output interface is up,
2550 * go ahead and send out that interface. Otherwise, the packet
2551 * is dropped below.
2552 */
2553 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2554 dst_if = ifp;
2555 goto sendunicast;
2556 }
2557
2558 /*
2559 * If the packet is a multicast, or we don't know a better way to
2560 * get there, send to all interfaces.
2561 */
2562 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2563 dst_if = NULL;
2564 else
2565 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2566 /* Tap any traffic not passing back out the originating interface */
2567 if (dst_if != ifp)
2568 ETHER_BPF_MTAP(bifp, m);
2569 if (dst_if == NULL) {
2570 struct bridge_iflist *bif;
2571 struct mbuf *mc;
2572 int used = 0;
2573
2574 bridge_span(sc, m);
2575
2576 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2577 dst_if = bif->bif_ifp;
2578
2579 if (dst_if->if_type == IFT_GIF)
2580 continue;
2581 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2582 continue;
2583
2584 /*
2585 * If this is not the original output interface,
2586 * and the interface is participating in spanning
2587 * tree, make sure the port is in a state that
2588 * allows forwarding.
2589 */
2590 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2591 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2592 continue;
2593
2594 if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2595 used = 1;
2596 mc = m;
2597 } else {
2598 mc = m_dup(m, M_NOWAIT);
2599 if (mc == NULL) {
2600 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2601 continue;
2602 }
2603 }
2604
2605 bridge_enqueue(sc, dst_if, mc, bif);
2606 }
2607 if (used == 0)
2608 m_freem(m);
2609 return (0);
2610 }
2611
2612 sendunicast:
2613 /*
2614 * XXX Spanning tree consideration here?
2615 */
2616
2617 bridge_span(sc, m);
2618 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2619 m_freem(m);
2620 return (0);
2621 }
2622
2623 bridge_enqueue(sc, dst_if, m, NULL);
2624 return (0);
2625 }
2626
2627 /*
2628 * bridge_transmit:
2629 *
2630 * Do output on a bridge.
2631 *
2632 */
2633 static int
bridge_transmit(struct ifnet * ifp,struct mbuf * m)2634 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2635 {
2636 struct bridge_softc *sc;
2637 struct ether_header *eh;
2638 struct ifnet *dst_if;
2639 int error = 0;
2640 ether_vlanid_t vlan;
2641
2642 sc = ifp->if_softc;
2643
2644 ETHER_BPF_MTAP(ifp, m);
2645
2646 eh = mtod(m, struct ether_header *);
2647 vlan = VLANTAGOF(m);
2648
2649 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2650 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan)) != NULL) {
2651 error = bridge_enqueue(sc, dst_if, m, NULL);
2652 } else
2653 bridge_broadcast(sc, ifp, m, 0);
2654
2655 return (error);
2656 }
2657
2658 #ifdef ALTQ
2659 static void
bridge_altq_start(if_t ifp)2660 bridge_altq_start(if_t ifp)
2661 {
2662 struct ifaltq *ifq = &ifp->if_snd;
2663 struct mbuf *m;
2664
2665 IFQ_LOCK(ifq);
2666 IFQ_DEQUEUE_NOLOCK(ifq, m);
2667 while (m != NULL) {
2668 bridge_transmit(ifp, m);
2669 IFQ_DEQUEUE_NOLOCK(ifq, m);
2670 }
2671 IFQ_UNLOCK(ifq);
2672 }
2673
2674 static int
bridge_altq_transmit(if_t ifp,struct mbuf * m)2675 bridge_altq_transmit(if_t ifp, struct mbuf *m)
2676 {
2677 int err;
2678
2679 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
2680 IFQ_ENQUEUE(&ifp->if_snd, m, err);
2681 if (err == 0)
2682 bridge_altq_start(ifp);
2683 } else
2684 err = bridge_transmit(ifp, m);
2685
2686 return (err);
2687 }
2688 #endif /* ALTQ */
2689
2690 /*
2691 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2692 */
2693 static void
bridge_qflush(struct ifnet * ifp __unused)2694 bridge_qflush(struct ifnet *ifp __unused)
2695 {
2696 }
2697
2698 /*
2699 * bridge_forward:
2700 *
2701 * The forwarding function of the bridge.
2702 *
2703 * NOTE: Releases the lock on return.
2704 */
2705 static void
bridge_forward(struct bridge_softc * sc,struct bridge_iflist * sbif,struct mbuf * m)2706 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2707 struct mbuf *m)
2708 {
2709 struct bridge_iflist *dbif;
2710 struct ifnet *src_if, *dst_if, *ifp;
2711 struct ether_header *eh;
2712 uint8_t *dst;
2713 int error;
2714 ether_vlanid_t vlan;
2715
2716 NET_EPOCH_ASSERT();
2717
2718 src_if = m->m_pkthdr.rcvif;
2719 ifp = sc->sc_ifp;
2720 vlan = VLANTAGOF(m);
2721
2722 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2723 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2724
2725 if ((sbif->bif_flags & IFBIF_STP) &&
2726 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2727 goto drop;
2728
2729 eh = mtod(m, struct ether_header *);
2730 dst = eh->ether_dhost;
2731
2732 /* If the interface is learning, record the address. */
2733 if (sbif->bif_flags & IFBIF_LEARNING) {
2734 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2735 sbif, 0, IFBAF_DYNAMIC);
2736 /*
2737 * If the interface has addresses limits then deny any source
2738 * that is not in the cache.
2739 */
2740 if (error && sbif->bif_addrmax)
2741 goto drop;
2742 }
2743
2744 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2745 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2746 goto drop;
2747
2748 #ifdef DEV_NETMAP
2749 /*
2750 * Hand the packet to netmap only if it wasn't injected by netmap
2751 * itself.
2752 */
2753 if ((m->m_flags & M_BRIDGE_INJECT) == 0 &&
2754 (if_getcapenable(ifp) & IFCAP_NETMAP) != 0) {
2755 ifp->if_input(ifp, m);
2756 return;
2757 }
2758 m->m_flags &= ~M_BRIDGE_INJECT;
2759 #endif
2760
2761 /*
2762 * At this point, the port either doesn't participate
2763 * in spanning tree or it is in the forwarding state.
2764 */
2765
2766 /*
2767 * If the packet is unicast, destined for someone on
2768 * "this" side of the bridge, drop it.
2769 */
2770 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2771 dst_if = bridge_rtlookup(sc, dst, vlan);
2772 if (src_if == dst_if)
2773 goto drop;
2774 } else {
2775 /*
2776 * Check if its a reserved multicast address, any address
2777 * listed in 802.1D section 7.12.6 may not be forwarded by the
2778 * bridge.
2779 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2780 */
2781 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2782 dst[2] == 0xc2 && dst[3] == 0x00 &&
2783 dst[4] == 0x00 && dst[5] <= 0x0f)
2784 goto drop;
2785
2786 /* ...forward it to all interfaces. */
2787 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2788 dst_if = NULL;
2789 }
2790
2791 /*
2792 * If we have a destination interface which is a member of our bridge,
2793 * OR this is a unicast packet, push it through the bpf(4) machinery.
2794 * For broadcast or multicast packets, don't bother because it will
2795 * be reinjected into ether_input. We do this before we pass the packets
2796 * through the pfil(9) framework, as it is possible that pfil(9) will
2797 * drop the packet, or possibly modify it, making it difficult to debug
2798 * firewall issues on the bridge.
2799 */
2800 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2801 ETHER_BPF_MTAP(ifp, m);
2802
2803 /* run the packet filter */
2804 if (PFIL_HOOKED_IN_46) {
2805 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2806 return;
2807 if (m == NULL)
2808 return;
2809 }
2810
2811 if (dst_if == NULL) {
2812 bridge_broadcast(sc, src_if, m, 1);
2813 return;
2814 }
2815
2816 /*
2817 * At this point, we're dealing with a unicast frame
2818 * going to a different interface.
2819 */
2820 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2821 goto drop;
2822
2823 dbif = bridge_lookup_member_if(sc, dst_if);
2824 if (dbif == NULL)
2825 /* Not a member of the bridge (anymore?) */
2826 goto drop;
2827
2828 /* Private segments can not talk to each other */
2829 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2830 goto drop;
2831
2832 if ((dbif->bif_flags & IFBIF_STP) &&
2833 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2834 goto drop;
2835
2836 if (PFIL_HOOKED_OUT_46) {
2837 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2838 return;
2839 if (m == NULL)
2840 return;
2841 }
2842
2843 bridge_enqueue(sc, dst_if, m, dbif);
2844 return;
2845
2846 drop:
2847 m_freem(m);
2848 }
2849
2850 /*
2851 * bridge_input:
2852 *
2853 * Receive input from a member interface. Queue the packet for
2854 * bridging if it is not for us.
2855 */
2856 static struct mbuf *
bridge_input(struct ifnet * ifp,struct mbuf * m)2857 bridge_input(struct ifnet *ifp, struct mbuf *m)
2858 {
2859 struct bridge_softc *sc = NULL;
2860 struct bridge_iflist *bif, *bif2;
2861 struct ifnet *bifp;
2862 struct ether_header *eh;
2863 struct mbuf *mc, *mc2;
2864 ether_vlanid_t vlan;
2865 int error;
2866
2867 NET_EPOCH_ASSERT();
2868
2869 /* We need the Ethernet header later, so make sure we have it now. */
2870 if (m->m_len < ETHER_HDR_LEN) {
2871 m = m_pullup(m, ETHER_HDR_LEN);
2872 if (m == NULL) {
2873 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1);
2874 m_freem(m);
2875 return (NULL);
2876 }
2877 }
2878
2879 eh = mtod(m, struct ether_header *);
2880 vlan = VLANTAGOF(m);
2881
2882 /*
2883 * If this frame has a VLAN tag and the receiving interface has a
2884 * vlan(4) trunk, then it is is destined for vlan(4), not for us.
2885 * This means if vlan(4) and bridge(4) are configured on the same
2886 * interface, vlan(4) is preferred, which is what users typically
2887 * expect.
2888 */
2889 if (vlan != DOT1Q_VID_NULL && ifp->if_vlantrunk != NULL)
2890 return (m);
2891
2892 bif = ifp->if_bridge;
2893 if (bif)
2894 sc = bif->bif_sc;
2895
2896 if (sc == NULL) {
2897 /*
2898 * This packet originated from the bridge itself, so it must
2899 * have been transmitted by netmap. Derive the "source"
2900 * interface from the source address and drop the packet if the
2901 * source address isn't known.
2902 */
2903 KASSERT((m->m_flags & M_BRIDGE_INJECT) != 0,
2904 ("%s: ifnet %p missing a bridge softc", __func__, ifp));
2905 sc = if_getsoftc(ifp);
2906 ifp = bridge_rtlookup(sc, eh->ether_shost, vlan);
2907 if (ifp == NULL) {
2908 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1);
2909 m_freem(m);
2910 return (NULL);
2911 }
2912 m->m_pkthdr.rcvif = ifp;
2913 }
2914 bifp = sc->sc_ifp;
2915 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2916 return (m);
2917
2918 /*
2919 * Implement support for bridge monitoring. If this flag has been
2920 * set on this interface, discard the packet once we push it through
2921 * the bpf(4) machinery, but before we do, increment the byte and
2922 * packet counters associated with this interface.
2923 */
2924 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2925 m->m_pkthdr.rcvif = bifp;
2926 ETHER_BPF_MTAP(bifp, m);
2927 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2928 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2929 m_freem(m);
2930 return (NULL);
2931 }
2932
2933 /* Do VLAN filtering. */
2934 if (!bridge_vfilter_in(bif, m)) {
2935 if_inc_counter(sc->sc_ifp, IFCOUNTER_IERRORS, 1);
2936 m_freem(m);
2937 return (NULL);
2938 }
2939 /* bridge_vfilter_in() may add a tag */
2940 vlan = VLANTAGOF(m);
2941
2942 bridge_span(sc, m);
2943
2944 if (m->m_flags & (M_BCAST|M_MCAST)) {
2945 /* Tap off 802.1D packets; they do not get forwarded. */
2946 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2947 ETHER_ADDR_LEN) == 0) {
2948 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2949 return (NULL);
2950 }
2951
2952 if ((bif->bif_flags & IFBIF_STP) &&
2953 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2954 return (m);
2955 }
2956
2957 /*
2958 * Make a deep copy of the packet and enqueue the copy
2959 * for bridge processing; return the original packet for
2960 * local processing.
2961 */
2962 mc = m_dup(m, M_NOWAIT);
2963 if (mc == NULL) {
2964 return (m);
2965 }
2966
2967 /* Perform the bridge forwarding function with the copy. */
2968 bridge_forward(sc, bif, mc);
2969
2970 #ifdef DEV_NETMAP
2971 /*
2972 * If netmap is enabled and has not already seen this packet,
2973 * then it will be consumed by bridge_forward().
2974 */
2975 if ((if_getcapenable(bifp) & IFCAP_NETMAP) != 0 &&
2976 (m->m_flags & M_BRIDGE_INJECT) == 0) {
2977 m_freem(m);
2978 return (NULL);
2979 }
2980 #endif
2981
2982 /*
2983 * Reinject the mbuf as arriving on the bridge so we have a
2984 * chance at claiming multicast packets. We can not loop back
2985 * here from ether_input as a bridge is never a member of a
2986 * bridge.
2987 */
2988 KASSERT(bifp->if_bridge == NULL,
2989 ("loop created in bridge_input"));
2990 mc2 = m_dup(m, M_NOWAIT);
2991 if (mc2 != NULL) {
2992 /* Keep the layer3 header aligned */
2993 int i = min(mc2->m_pkthdr.len, max_protohdr);
2994 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2995 }
2996 if (mc2 != NULL) {
2997 mc2->m_pkthdr.rcvif = bifp;
2998 mc2->m_flags &= ~M_BRIDGE_INJECT;
2999 sc->sc_if_input(bifp, mc2);
3000 }
3001
3002 /* Return the original packet for local processing. */
3003 return (m);
3004 }
3005
3006 if ((bif->bif_flags & IFBIF_STP) &&
3007 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
3008 return (m);
3009 }
3010
3011 #if defined(INET) || defined(INET6)
3012 #define CARP_CHECK_WE_ARE_DST(iface) \
3013 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost))
3014 #define CARP_CHECK_WE_ARE_SRC(iface) \
3015 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost))
3016 #else
3017 #define CARP_CHECK_WE_ARE_DST(iface) false
3018 #define CARP_CHECK_WE_ARE_SRC(iface) false
3019 #endif
3020
3021 #ifdef DEV_NETMAP
3022 #define GRAB_FOR_NETMAP(ifp, m) do { \
3023 if ((if_getcapenable(ifp) & IFCAP_NETMAP) != 0 && \
3024 ((m)->m_flags & M_BRIDGE_INJECT) == 0) { \
3025 (ifp)->if_input(ifp, m); \
3026 return (NULL); \
3027 } \
3028 } while (0)
3029 #else
3030 #define GRAB_FOR_NETMAP(ifp, m)
3031 #endif
3032
3033 #define GRAB_OUR_PACKETS(iface) \
3034 if ((iface)->if_type == IFT_GIF) \
3035 continue; \
3036 /* It is destined for us. */ \
3037 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \
3038 CARP_CHECK_WE_ARE_DST(iface)) { \
3039 if (bif->bif_flags & IFBIF_LEARNING) { \
3040 error = bridge_rtupdate(sc, eh->ether_shost, \
3041 vlan, bif, 0, IFBAF_DYNAMIC); \
3042 if (error && bif->bif_addrmax) { \
3043 m_freem(m); \
3044 return (NULL); \
3045 } \
3046 } \
3047 m->m_pkthdr.rcvif = iface; \
3048 if ((iface) == ifp) { \
3049 /* Skip bridge processing... src == dest */ \
3050 return (m); \
3051 } \
3052 /* It's passing over or to the bridge, locally. */ \
3053 ETHER_BPF_MTAP(bifp, m); \
3054 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \
3055 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);\
3056 /* Hand the packet over to netmap if necessary. */ \
3057 GRAB_FOR_NETMAP(bifp, m); \
3058 /* Filter on the physical interface. */ \
3059 if (V_pfil_local_phys && PFIL_HOOKED_IN_46) { \
3060 if (bridge_pfil(&m, NULL, ifp, \
3061 PFIL_IN) != 0 || m == NULL) { \
3062 return (NULL); \
3063 } \
3064 } \
3065 if ((iface) != bifp) \
3066 ETHER_BPF_MTAP(iface, m); \
3067 /* Pass tagged packets to if_vlan, if it's loaded */ \
3068 if (VLANTAGOF(m) != 0) { \
3069 if (bifp->if_vlantrunk == NULL) { \
3070 m_freem(m); \
3071 return (NULL); \
3072 } \
3073 (*vlan_input_p)(bifp, m); \
3074 return (NULL); \
3075 } \
3076 return (m); \
3077 } \
3078 \
3079 /* We just received a packet that we sent out. */ \
3080 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \
3081 CARP_CHECK_WE_ARE_SRC(iface)) { \
3082 m_freem(m); \
3083 return (NULL); \
3084 }
3085
3086 /*
3087 * Unicast. Make sure it's not for the bridge.
3088 */
3089 do { GRAB_OUR_PACKETS(bifp) } while (0);
3090
3091 /*
3092 * If member_ifaddrs is enabled, see if the packet is destined for
3093 * one of the members' addresses.
3094 */
3095 if (V_member_ifaddrs) {
3096 /* Check the interface the packet arrived on. */
3097 do { GRAB_OUR_PACKETS(ifp) } while (0);
3098
3099 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
3100 GRAB_OUR_PACKETS(bif2->bif_ifp)
3101 }
3102 }
3103
3104 #undef CARP_CHECK_WE_ARE_DST
3105 #undef CARP_CHECK_WE_ARE_SRC
3106 #undef GRAB_FOR_NETMAP
3107 #undef GRAB_OUR_PACKETS
3108
3109 /* Perform the bridge forwarding function. */
3110 bridge_forward(sc, bif, m);
3111
3112 return (NULL);
3113 }
3114
3115 /*
3116 * Inject a packet back into the host ethernet stack. This will generally only
3117 * be used by netmap when an application writes to the host TX ring. The
3118 * M_BRIDGE_INJECT flag ensures that the packet is re-routed to the bridge
3119 * interface after ethernet processing.
3120 */
3121 static void
bridge_inject(struct ifnet * ifp,struct mbuf * m)3122 bridge_inject(struct ifnet *ifp, struct mbuf *m)
3123 {
3124 struct bridge_softc *sc;
3125
3126 if (ifp->if_type == IFT_L2VLAN) {
3127 /*
3128 * vlan(4) gives us the vlan ifnet, so we need to get the
3129 * bridge softc to get a pointer to ether_input to send the
3130 * packet to.
3131 */
3132 struct ifnet *bifp = NULL;
3133
3134 if (vlan_trunkdev_p == NULL) {
3135 m_freem(m);
3136 return;
3137 }
3138
3139 bifp = vlan_trunkdev_p(ifp);
3140 if (bifp == NULL) {
3141 m_freem(m);
3142 return;
3143 }
3144
3145 sc = if_getsoftc(bifp);
3146 sc->sc_if_input(ifp, m);
3147 return;
3148 }
3149
3150 KASSERT((if_getcapenable(ifp) & IFCAP_NETMAP) != 0,
3151 ("%s: iface %s is not running in netmap mode",
3152 __func__, if_name(ifp)));
3153 KASSERT((m->m_flags & M_BRIDGE_INJECT) == 0,
3154 ("%s: mbuf %p has M_BRIDGE_INJECT set", __func__, m));
3155
3156 m->m_flags |= M_BRIDGE_INJECT;
3157 sc = if_getsoftc(ifp);
3158 sc->sc_if_input(ifp, m);
3159 }
3160
3161 /*
3162 * bridge_broadcast:
3163 *
3164 * Send a frame to all interfaces that are members of
3165 * the bridge, except for the one on which the packet
3166 * arrived.
3167 *
3168 * NOTE: Releases the lock on return.
3169 */
3170 static void
bridge_broadcast(struct bridge_softc * sc,struct ifnet * src_if,struct mbuf * m,int runfilt)3171 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
3172 struct mbuf *m, int runfilt)
3173 {
3174 struct bridge_iflist *dbif, *sbif;
3175 struct mbuf *mc;
3176 struct ifnet *dst_if;
3177 int used = 0, i;
3178
3179 NET_EPOCH_ASSERT();
3180
3181 sbif = bridge_lookup_member_if(sc, src_if);
3182
3183 /* Filter on the bridge interface before broadcasting */
3184 if (runfilt && PFIL_HOOKED_OUT_46) {
3185 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
3186 return;
3187 if (m == NULL)
3188 return;
3189 }
3190
3191 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
3192 dst_if = dbif->bif_ifp;
3193 if (dst_if == src_if)
3194 continue;
3195
3196 /* Private segments can not talk to each other */
3197 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
3198 continue;
3199
3200 if ((dbif->bif_flags & IFBIF_STP) &&
3201 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
3202 continue;
3203
3204 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
3205 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
3206 continue;
3207
3208 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
3209 continue;
3210
3211 if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
3212 mc = m;
3213 used = 1;
3214 } else {
3215 mc = m_dup(m, M_NOWAIT);
3216 if (mc == NULL) {
3217 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
3218 continue;
3219 }
3220 }
3221
3222 /*
3223 * Filter on the output interface. Pass a NULL bridge interface
3224 * pointer so we do not redundantly filter on the bridge for
3225 * each interface we broadcast on.
3226 */
3227 if (runfilt && PFIL_HOOKED_OUT_46) {
3228 if (used == 0) {
3229 /* Keep the layer3 header aligned */
3230 i = min(mc->m_pkthdr.len, max_protohdr);
3231 mc = m_copyup(mc, i, ETHER_ALIGN);
3232 if (mc == NULL) {
3233 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
3234 continue;
3235 }
3236 }
3237 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
3238 continue;
3239 if (mc == NULL)
3240 continue;
3241 }
3242
3243 bridge_enqueue(sc, dst_if, mc, dbif);
3244 }
3245 if (used == 0)
3246 m_freem(m);
3247 }
3248
3249 /*
3250 * bridge_span:
3251 *
3252 * Duplicate a packet out one or more interfaces that are in span mode,
3253 * the original mbuf is unmodified.
3254 */
3255 static void
bridge_span(struct bridge_softc * sc,struct mbuf * m)3256 bridge_span(struct bridge_softc *sc, struct mbuf *m)
3257 {
3258 struct bridge_iflist *bif;
3259 struct ifnet *dst_if;
3260 struct mbuf *mc;
3261
3262 NET_EPOCH_ASSERT();
3263
3264 if (CK_LIST_EMPTY(&sc->sc_spanlist))
3265 return;
3266
3267 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
3268 dst_if = bif->bif_ifp;
3269
3270 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
3271 continue;
3272
3273 mc = m_dup(m, M_NOWAIT);
3274 if (mc == NULL) {
3275 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
3276 continue;
3277 }
3278
3279 bridge_enqueue(sc, dst_if, mc, bif);
3280 }
3281 }
3282
3283 /*
3284 * Incoming VLAN filtering. Given a frame and the member interface it was
3285 * received on, decide whether the port configuration allows it.
3286 */
3287 static bool
bridge_vfilter_in(const struct bridge_iflist * sbif,struct mbuf * m)3288 bridge_vfilter_in(const struct bridge_iflist *sbif, struct mbuf *m)
3289 {
3290 ether_vlanid_t vlan;
3291
3292 vlan = VLANTAGOF(m);
3293 /* Make sure the vlan id is reasonable. */
3294 if (vlan > DOT1Q_VID_MAX)
3295 return (false);
3296
3297 /*
3298 * If VLAN filtering isn't enabled, pass everything, but add a tag
3299 * if the port has a pvid configured.
3300 */
3301 if ((sbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0) {
3302 if (vlan == DOT1Q_VID_NULL &&
3303 sbif->bif_pvid != DOT1Q_VID_NULL) {
3304 m->m_pkthdr.ether_vtag = sbif->bif_pvid;
3305 m->m_flags |= M_VLANTAG;
3306 }
3307
3308 return (true);
3309 }
3310
3311 /* If Q-in-Q is disabled, check for stacked tags. */
3312 if ((sbif->bif_flags & IFBIF_QINQ) == 0) {
3313 struct ether_header *eh;
3314 uint16_t proto;
3315
3316 eh = mtod(m, struct ether_header *);
3317 proto = ntohs(eh->ether_type);
3318
3319 if (proto == ETHERTYPE_VLAN || proto == ETHERTYPE_QINQ)
3320 return (false);
3321 }
3322
3323 if (vlan == DOT1Q_VID_NULL) {
3324 /*
3325 * The frame doesn't have a tag. If the interface does not
3326 * have an untagged vlan configured, drop the frame.
3327 */
3328 if (sbif->bif_pvid == DOT1Q_VID_NULL)
3329 return (false);
3330
3331 /*
3332 * Otherwise, insert a new tag based on the interface's
3333 * untagged vlan id.
3334 */
3335 m->m_pkthdr.ether_vtag = sbif->bif_pvid;
3336 m->m_flags |= M_VLANTAG;
3337 } else {
3338 /*
3339 * The frame has a tag, so check it matches the interface's
3340 * vlan access list. We explicitly do not accept tagged
3341 * frames for the untagged vlan id here (unless it's also
3342 * in the access list).
3343 */
3344 if (!BRVLAN_TEST(&sbif->bif_vlan_set, vlan))
3345 return (false);
3346 }
3347
3348 /* Accept the frame. */
3349 return (true);
3350 }
3351
3352 /*
3353 * Outgoing VLAN filtering. Given a frame, its vlan, and the member interface
3354 * we intend to send it to, decide whether the port configuration allows it to
3355 * be sent.
3356 */
3357 static bool
bridge_vfilter_out(const struct bridge_iflist * dbif,const struct mbuf * m)3358 bridge_vfilter_out(const struct bridge_iflist *dbif, const struct mbuf *m)
3359 {
3360 struct ether_header *eh;
3361 ether_vlanid_t vlan;
3362
3363 NET_EPOCH_ASSERT();
3364
3365 /*
3366 * If the interface is in span mode, then bif_sc will be NULL.
3367 * Since the purpose of span interfaces is to receive all frames,
3368 * pass everything.
3369 */
3370 if (dbif->bif_sc == NULL)
3371 return (true);
3372
3373 /* If VLAN filtering isn't enabled, pass everything. */
3374 if ((dbif->bif_sc->sc_flags & IFBRF_VLANFILTER) == 0)
3375 return (true);
3376
3377 vlan = VLANTAGOF(m);
3378
3379 /*
3380 * Always allow untagged 802.1D STP frames, even if they would
3381 * otherwise be dropped. This is required for STP to work on
3382 * a filtering bridge.
3383 *
3384 * Tagged STP (Cisco PVST+) is a non-standard extension, so
3385 * handle those frames via the normal filtering path.
3386 */
3387 eh = mtod(m, struct ether_header *);
3388 if (vlan == DOT1Q_VID_NULL &&
3389 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0)
3390 return (true);
3391
3392 /*
3393 * If the frame wasn't assigned to a vlan at ingress, drop it.
3394 * We can't forward these frames to filtering ports because we
3395 * don't know what VLAN they're supposed to be in.
3396 */
3397 if (vlan == DOT1Q_VID_NULL)
3398 return (false);
3399
3400 /*
3401 * If the frame's vlan matches the interfaces's untagged vlan,
3402 * allow it.
3403 */
3404 if (vlan == dbif->bif_pvid)
3405 return (true);
3406
3407 /*
3408 * If the frame's vlan is on the interface's tagged access list,
3409 * allow it.
3410 */
3411 if (BRVLAN_TEST(&dbif->bif_vlan_set, vlan))
3412 return (true);
3413
3414 /* The frame was not permitted, so drop it. */
3415 return (false);
3416 }
3417
3418 /*
3419 * bridge_rtupdate:
3420 *
3421 * Add a bridge routing entry.
3422 */
3423 static int
bridge_rtupdate(struct bridge_softc * sc,const uint8_t * dst,ether_vlanid_t vlan,struct bridge_iflist * bif,int setflags,uint8_t flags)3424 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
3425 ether_vlanid_t vlan, struct bridge_iflist *bif,
3426 int setflags, uint8_t flags)
3427 {
3428 struct bridge_rtnode *brt;
3429 struct bridge_iflist *obif;
3430 int error;
3431
3432 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
3433
3434 /* Check the source address is valid and not multicast. */
3435 if (ETHER_IS_MULTICAST(dst))
3436 return (EXTERROR(EINVAL, "Multicast address not permitted"));
3437 if (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
3438 dst[3] == 0 && dst[4] == 0 && dst[5] == 0)
3439 return (EXTERROR(EINVAL, "Zero address not permitted"));
3440
3441 /*
3442 * A route for this destination might already exist. If so,
3443 * update it, otherwise create a new one.
3444 */
3445 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
3446 BRIDGE_RT_LOCK(sc);
3447
3448 /* Check again, now that we have the lock. There could have
3449 * been a race and we only want to insert this once. */
3450 if (bridge_rtnode_lookup(sc, dst, vlan) != NULL) {
3451 BRIDGE_RT_UNLOCK(sc);
3452 return (0);
3453 }
3454
3455 if (sc->sc_brtcnt >= sc->sc_brtmax) {
3456 sc->sc_brtexceeded++;
3457 BRIDGE_RT_UNLOCK(sc);
3458 return (EXTERROR(ENOSPC, "Address table is full"));
3459 }
3460 /* Check per interface address limits (if enabled) */
3461 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
3462 bif->bif_addrexceeded++;
3463 BRIDGE_RT_UNLOCK(sc);
3464 return (EXTERROR(ENOSPC,
3465 "Interface address limit exceeded"));
3466 }
3467
3468 /*
3469 * Allocate a new bridge forwarding node, and
3470 * initialize the expiration time and Ethernet
3471 * address.
3472 */
3473 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
3474 if (brt == NULL) {
3475 BRIDGE_RT_UNLOCK(sc);
3476 return (EXTERROR(ENOMEM,
3477 "Cannot allocate address node"));
3478 }
3479 brt->brt_vnet = curvnet;
3480
3481 if (bif->bif_flags & IFBIF_STICKY)
3482 brt->brt_flags = IFBAF_STICKY;
3483 else
3484 brt->brt_flags = IFBAF_DYNAMIC;
3485
3486 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
3487 brt->brt_vlan = vlan;
3488
3489 brt->brt_dst = bif;
3490 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
3491 uma_zfree(V_bridge_rtnode_zone, brt);
3492 BRIDGE_RT_UNLOCK(sc);
3493 return (error);
3494 }
3495 bif->bif_addrcnt++;
3496
3497 BRIDGE_RT_UNLOCK(sc);
3498 }
3499
3500 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
3501 (obif = brt->brt_dst) != bif) {
3502 MPASS(obif != NULL);
3503
3504 BRIDGE_RT_LOCK(sc);
3505 brt->brt_dst->bif_addrcnt--;
3506 brt->brt_dst = bif;
3507 brt->brt_dst->bif_addrcnt++;
3508 BRIDGE_RT_UNLOCK(sc);
3509
3510 if (V_log_mac_flap &&
3511 ppsratecheck(&V_log_last, &V_log_count, V_log_interval)) {
3512 log(LOG_NOTICE,
3513 "%s: mac address %6D vlan %d moved from %s to %s\n",
3514 sc->sc_ifp->if_xname,
3515 &brt->brt_addr[0], ":",
3516 brt->brt_vlan,
3517 obif->bif_ifp->if_xname,
3518 bif->bif_ifp->if_xname);
3519 }
3520 }
3521
3522 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3523 brt->brt_expire = time_uptime + sc->sc_brttimeout;
3524 if (setflags)
3525 brt->brt_flags = flags;
3526
3527 return (0);
3528 }
3529
3530 /*
3531 * bridge_rtlookup:
3532 *
3533 * Lookup the destination interface for an address.
3534 */
3535 static struct ifnet *
bridge_rtlookup(struct bridge_softc * sc,const uint8_t * addr,ether_vlanid_t vlan)3536 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr,
3537 ether_vlanid_t vlan)
3538 {
3539 struct bridge_rtnode *brt;
3540
3541 NET_EPOCH_ASSERT();
3542
3543 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
3544 return (NULL);
3545
3546 return (brt->brt_ifp);
3547 }
3548
3549 /*
3550 * bridge_rttrim:
3551 *
3552 * Trim the routine table so that we have a number
3553 * of routing entries less than or equal to the
3554 * maximum number.
3555 */
3556 static void
bridge_rttrim(struct bridge_softc * sc)3557 bridge_rttrim(struct bridge_softc *sc)
3558 {
3559 struct bridge_rtnode *brt, *nbrt;
3560
3561 NET_EPOCH_ASSERT();
3562 BRIDGE_RT_LOCK_ASSERT(sc);
3563
3564 /* Make sure we actually need to do this. */
3565 if (sc->sc_brtcnt <= sc->sc_brtmax)
3566 return;
3567
3568 /* Force an aging cycle; this might trim enough addresses. */
3569 bridge_rtage(sc);
3570 if (sc->sc_brtcnt <= sc->sc_brtmax)
3571 return;
3572
3573 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3574 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
3575 bridge_rtnode_destroy(sc, brt);
3576 if (sc->sc_brtcnt <= sc->sc_brtmax)
3577 return;
3578 }
3579 }
3580 }
3581
3582 /*
3583 * bridge_timer:
3584 *
3585 * Aging timer for the bridge.
3586 */
3587 static void
bridge_timer(void * arg)3588 bridge_timer(void *arg)
3589 {
3590 struct bridge_softc *sc = arg;
3591
3592 BRIDGE_RT_LOCK_ASSERT(sc);
3593
3594 /* Destruction of rtnodes requires a proper vnet context */
3595 CURVNET_SET(sc->sc_ifp->if_vnet);
3596 bridge_rtage(sc);
3597
3598 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
3599 callout_reset(&sc->sc_brcallout,
3600 bridge_rtable_prune_period * hz, bridge_timer, sc);
3601 CURVNET_RESTORE();
3602 }
3603
3604 /*
3605 * bridge_rtage:
3606 *
3607 * Perform an aging cycle.
3608 */
3609 static void
bridge_rtage(struct bridge_softc * sc)3610 bridge_rtage(struct bridge_softc *sc)
3611 {
3612 struct bridge_rtnode *brt, *nbrt;
3613
3614 BRIDGE_RT_LOCK_ASSERT(sc);
3615
3616 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3617 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
3618 if (time_uptime >= brt->brt_expire)
3619 bridge_rtnode_destroy(sc, brt);
3620 }
3621 }
3622 }
3623
3624 /*
3625 * bridge_rtflush:
3626 *
3627 * Remove all dynamic addresses from the bridge.
3628 */
3629 static void
bridge_rtflush(struct bridge_softc * sc,int full)3630 bridge_rtflush(struct bridge_softc *sc, int full)
3631 {
3632 struct bridge_rtnode *brt, *nbrt;
3633
3634 BRIDGE_RT_LOCK_ASSERT(sc);
3635
3636 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3637 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3638 bridge_rtnode_destroy(sc, brt);
3639 }
3640 }
3641
3642 /*
3643 * bridge_rtdaddr:
3644 *
3645 * Remove an address from the table.
3646 */
3647 static int
bridge_rtdaddr(struct bridge_softc * sc,const uint8_t * addr,ether_vlanid_t vlan)3648 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr,
3649 ether_vlanid_t vlan)
3650 {
3651 struct bridge_rtnode *brt;
3652 int found = 0;
3653
3654 BRIDGE_RT_LOCK(sc);
3655
3656 /*
3657 * If vlan is DOT1Q_VID_RSVD_IMPL then we want to delete for all vlans
3658 * so the lookup may return more than one.
3659 */
3660 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
3661 bridge_rtnode_destroy(sc, brt);
3662 found = 1;
3663 }
3664
3665 BRIDGE_RT_UNLOCK(sc);
3666
3667 return (found ? 0 : ENOENT);
3668 }
3669
3670 /*
3671 * bridge_rtdelete:
3672 *
3673 * Delete routes to a speicifc member interface.
3674 */
3675 static void
bridge_rtdelete(struct bridge_softc * sc,struct ifnet * ifp,int full)3676 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
3677 {
3678 struct bridge_rtnode *brt, *nbrt;
3679
3680 BRIDGE_RT_LOCK_ASSERT(sc);
3681
3682 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3683 if (brt->brt_ifp == ifp && (full ||
3684 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
3685 bridge_rtnode_destroy(sc, brt);
3686 }
3687 }
3688
3689 /*
3690 * bridge_rtable_init:
3691 *
3692 * Initialize the route table for this bridge.
3693 */
3694 static void
bridge_rtable_init(struct bridge_softc * sc)3695 bridge_rtable_init(struct bridge_softc *sc)
3696 {
3697 int i;
3698
3699 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
3700 M_DEVBUF, M_WAITOK);
3701
3702 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3703 CK_LIST_INIT(&sc->sc_rthash[i]);
3704
3705 sc->sc_rthash_key = arc4random();
3706 CK_LIST_INIT(&sc->sc_rtlist);
3707 }
3708
3709 /*
3710 * bridge_rtable_fini:
3711 *
3712 * Deconstruct the route table for this bridge.
3713 */
3714 static void
bridge_rtable_fini(struct bridge_softc * sc)3715 bridge_rtable_fini(struct bridge_softc *sc)
3716 {
3717
3718 KASSERT(sc->sc_brtcnt == 0,
3719 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
3720 free(sc->sc_rthash, M_DEVBUF);
3721 }
3722
3723 /*
3724 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3725 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3726 */
3727 #define mix(a, b, c) \
3728 do { \
3729 a -= b; a -= c; a ^= (c >> 13); \
3730 b -= c; b -= a; b ^= (a << 8); \
3731 c -= a; c -= b; c ^= (b >> 13); \
3732 a -= b; a -= c; a ^= (c >> 12); \
3733 b -= c; b -= a; b ^= (a << 16); \
3734 c -= a; c -= b; c ^= (b >> 5); \
3735 a -= b; a -= c; a ^= (c >> 3); \
3736 b -= c; b -= a; b ^= (a << 10); \
3737 c -= a; c -= b; c ^= (b >> 15); \
3738 } while (/*CONSTCOND*/0)
3739
3740 static __inline uint32_t
bridge_rthash(struct bridge_softc * sc,const uint8_t * addr)3741 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3742 {
3743 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3744
3745 b += addr[5] << 8;
3746 b += addr[4];
3747 a += addr[3] << 24;
3748 a += addr[2] << 16;
3749 a += addr[1] << 8;
3750 a += addr[0];
3751
3752 mix(a, b, c);
3753
3754 return (c & BRIDGE_RTHASH_MASK);
3755 }
3756
3757 #undef mix
3758
3759 static int
bridge_rtnode_addr_cmp(const uint8_t * a,const uint8_t * b)3760 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3761 {
3762 int i, d;
3763
3764 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3765 d = ((int)a[i]) - ((int)b[i]);
3766 }
3767
3768 return (d);
3769 }
3770
3771 /*
3772 * bridge_rtnode_lookup:
3773 *
3774 * Look up a bridge route node for the specified destination. Compare the
3775 * vlan id or if zero then just return the first match.
3776 */
3777 static struct bridge_rtnode *
bridge_rtnode_lookup(struct bridge_softc * sc,const uint8_t * addr,ether_vlanid_t vlan)3778 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr,
3779 ether_vlanid_t vlan)
3780 {
3781 struct bridge_rtnode *brt;
3782 uint32_t hash;
3783 int dir;
3784
3785 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc);
3786
3787 hash = bridge_rthash(sc, addr);
3788 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3789 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3790 if (dir == 0 && (brt->brt_vlan == vlan || vlan == DOT1Q_VID_RSVD_IMPL))
3791 return (brt);
3792 if (dir > 0)
3793 return (NULL);
3794 }
3795
3796 return (NULL);
3797 }
3798
3799 /*
3800 * bridge_rtnode_insert:
3801 *
3802 * Insert the specified bridge node into the route table. We
3803 * assume the entry is not already in the table.
3804 */
3805 static int
bridge_rtnode_insert(struct bridge_softc * sc,struct bridge_rtnode * brt)3806 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3807 {
3808 struct bridge_rtnode *lbrt;
3809 uint32_t hash;
3810 int dir;
3811
3812 BRIDGE_RT_LOCK_ASSERT(sc);
3813
3814 hash = bridge_rthash(sc, brt->brt_addr);
3815
3816 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3817 if (lbrt == NULL) {
3818 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3819 goto out;
3820 }
3821
3822 do {
3823 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3824 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3825 return (EXTERROR(EEXIST, "Address already exists"));
3826 if (dir > 0) {
3827 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3828 goto out;
3829 }
3830 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3831 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3832 goto out;
3833 }
3834 lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3835 } while (lbrt != NULL);
3836
3837 #ifdef DIAGNOSTIC
3838 panic("bridge_rtnode_insert: impossible");
3839 #endif
3840
3841 out:
3842 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3843 sc->sc_brtcnt++;
3844
3845 return (0);
3846 }
3847
3848 static void
bridge_rtnode_destroy_cb(struct epoch_context * ctx)3849 bridge_rtnode_destroy_cb(struct epoch_context *ctx)
3850 {
3851 struct bridge_rtnode *brt;
3852
3853 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx);
3854
3855 CURVNET_SET(brt->brt_vnet);
3856 uma_zfree(V_bridge_rtnode_zone, brt);
3857 CURVNET_RESTORE();
3858 }
3859
3860 /*
3861 * bridge_rtnode_destroy:
3862 *
3863 * Destroy a bridge rtnode.
3864 */
3865 static void
bridge_rtnode_destroy(struct bridge_softc * sc,struct bridge_rtnode * brt)3866 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3867 {
3868 BRIDGE_RT_LOCK_ASSERT(sc);
3869
3870 CK_LIST_REMOVE(brt, brt_hash);
3871
3872 CK_LIST_REMOVE(brt, brt_list);
3873 sc->sc_brtcnt--;
3874 brt->brt_dst->bif_addrcnt--;
3875
3876 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx);
3877 }
3878
3879 /*
3880 * bridge_rtable_expire:
3881 *
3882 * Set the expiry time for all routes on an interface.
3883 */
3884 static void
bridge_rtable_expire(struct ifnet * ifp,int age)3885 bridge_rtable_expire(struct ifnet *ifp, int age)
3886 {
3887 struct bridge_iflist *bif = NULL;
3888 struct bridge_softc *sc = NULL;
3889 struct bridge_rtnode *brt;
3890
3891 CURVNET_SET(ifp->if_vnet);
3892
3893 bif = ifp->if_bridge;
3894 if (bif)
3895 sc = bif->bif_sc;
3896 MPASS(sc != NULL);
3897 BRIDGE_RT_LOCK(sc);
3898
3899 /*
3900 * If the age is zero then flush, otherwise set all the expiry times to
3901 * age for the interface
3902 */
3903 if (age == 0)
3904 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3905 else {
3906 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3907 /* Cap the expiry time to 'age' */
3908 if (brt->brt_ifp == ifp &&
3909 brt->brt_expire > time_uptime + age &&
3910 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3911 brt->brt_expire = time_uptime + age;
3912 }
3913 }
3914 BRIDGE_RT_UNLOCK(sc);
3915 CURVNET_RESTORE();
3916 }
3917
3918 /*
3919 * bridge_state_change:
3920 *
3921 * Callback from the bridgestp code when a port changes states.
3922 */
3923 static void
bridge_state_change(struct ifnet * ifp,int state)3924 bridge_state_change(struct ifnet *ifp, int state)
3925 {
3926 struct bridge_iflist *bif = ifp->if_bridge;
3927 struct bridge_softc *sc = bif->bif_sc;
3928 static const char *stpstates[] = {
3929 "disabled",
3930 "listening",
3931 "learning",
3932 "forwarding",
3933 "blocking",
3934 "discarding"
3935 };
3936
3937 CURVNET_SET(ifp->if_vnet);
3938 if (V_log_stp)
3939 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3940 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3941 CURVNET_RESTORE();
3942 }
3943
3944 /*
3945 * Send bridge packets through pfil if they are one of the types pfil can deal
3946 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3947 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3948 * that interface.
3949 */
3950 static int
bridge_pfil(struct mbuf ** mp,struct ifnet * bifp,struct ifnet * ifp,int dir)3951 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3952 {
3953 int snap, error, i;
3954 struct ether_header *eh1, eh2;
3955 struct llc llc1;
3956 u_int16_t ether_type;
3957 pfil_return_t rv;
3958 #ifdef INET
3959 struct ip *ip = NULL;
3960 int hlen = 0;
3961 #endif
3962
3963 snap = 0;
3964 error = -1; /* Default error if not error == 0 */
3965
3966 #if 0
3967 /* we may return with the IP fields swapped, ensure its not shared */
3968 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3969 #endif
3970
3971 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3972 return (0); /* filtering is disabled */
3973
3974 i = min((*mp)->m_pkthdr.len, max_protohdr);
3975 if ((*mp)->m_len < i) {
3976 *mp = m_pullup(*mp, i);
3977 if (*mp == NULL) {
3978 printf("%s: m_pullup failed\n", __func__);
3979 return (-1);
3980 }
3981 }
3982
3983 eh1 = mtod(*mp, struct ether_header *);
3984 ether_type = ntohs(eh1->ether_type);
3985
3986 /*
3987 * Check for SNAP/LLC.
3988 */
3989 if (ether_type < ETHERMTU) {
3990 struct llc *llc2 = (struct llc *)(eh1 + 1);
3991
3992 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3993 llc2->llc_dsap == LLC_SNAP_LSAP &&
3994 llc2->llc_ssap == LLC_SNAP_LSAP &&
3995 llc2->llc_control == LLC_UI) {
3996 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3997 snap = 1;
3998 }
3999 }
4000
4001 /*
4002 * If we're trying to filter bridge traffic, only look at traffic for
4003 * protocols available in the kernel (IPv4 and/or IPv6) to avoid
4004 * passing traffic for an unsupported protocol to the filter. This is
4005 * lame since if we really wanted, say, an AppleTalk filter, we are
4006 * hosed, but of course we don't have an AppleTalk filter to begin
4007 * with. (Note that since pfil doesn't understand ARP it will pass
4008 * *ALL* ARP traffic.)
4009 */
4010 switch (ether_type) {
4011 #ifdef INET
4012 case ETHERTYPE_ARP:
4013 case ETHERTYPE_REVARP:
4014 if (V_pfil_ipfw_arp == 0)
4015 return (0); /* Automatically pass */
4016
4017 /* FALLTHROUGH */
4018 case ETHERTYPE_IP:
4019 #endif
4020 #ifdef INET6
4021 case ETHERTYPE_IPV6:
4022 #endif /* INET6 */
4023 break;
4024
4025 default:
4026 /*
4027 * We get here if the packet isn't from a supported
4028 * protocol. Check to see if the user wants to pass
4029 * non-IP packets, these will not be checked by pfil(9)
4030 * and passed unconditionally so the default is to
4031 * drop.
4032 */
4033 if (V_pfil_onlyip)
4034 goto bad;
4035 }
4036
4037 /* Run the packet through pfil before stripping link headers */
4038 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
4039 dir == PFIL_OUT && ifp != NULL) {
4040 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) {
4041 case PFIL_DROPPED:
4042 return (EACCES);
4043 case PFIL_CONSUMED:
4044 return (0);
4045 }
4046 }
4047
4048 /* Strip off the Ethernet header and keep a copy. */
4049 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
4050 m_adj(*mp, ETHER_HDR_LEN);
4051
4052 /* Strip off snap header, if present */
4053 if (snap) {
4054 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
4055 m_adj(*mp, sizeof(struct llc));
4056 }
4057
4058 /*
4059 * Check the IP header for alignment and errors
4060 */
4061 if (dir == PFIL_IN) {
4062 switch (ether_type) {
4063 #ifdef INET
4064 case ETHERTYPE_IP:
4065 error = bridge_ip_checkbasic(mp);
4066 break;
4067 #endif
4068 #ifdef INET6
4069 case ETHERTYPE_IPV6:
4070 error = bridge_ip6_checkbasic(mp);
4071 break;
4072 #endif /* INET6 */
4073 default:
4074 error = 0;
4075 }
4076 if (error)
4077 goto bad;
4078 }
4079
4080 error = 0;
4081
4082 /*
4083 * Run the packet through pfil
4084 */
4085 rv = PFIL_PASS;
4086 switch (ether_type) {
4087 #ifdef INET
4088 case ETHERTYPE_IP:
4089 /*
4090 * Run pfil on the member interface and the bridge, both can
4091 * be skipped by clearing pfil_member or pfil_bridge.
4092 *
4093 * Keep the order:
4094 * in_if -> bridge_if -> out_if
4095 */
4096 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
4097 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) !=
4098 PFIL_PASS)
4099 break;
4100
4101 if (V_pfil_member && ifp != NULL) {
4102 rv = (dir == PFIL_OUT) ?
4103 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) :
4104 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL);
4105 if (rv != PFIL_PASS)
4106 break;
4107 }
4108
4109 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
4110 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) !=
4111 PFIL_PASS)
4112 break;
4113
4114 /* check if we need to fragment the packet */
4115 /* bridge_fragment generates a mbuf chain of packets */
4116 /* that already include eth headers */
4117 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
4118 i = (*mp)->m_pkthdr.len;
4119 if (i > ifp->if_mtu) {
4120 error = bridge_fragment(ifp, mp, &eh2, snap,
4121 &llc1);
4122 return (error);
4123 }
4124 }
4125
4126 /* Recalculate the ip checksum. */
4127 ip = mtod(*mp, struct ip *);
4128 hlen = ip->ip_hl << 2;
4129 if (hlen < sizeof(struct ip))
4130 goto bad;
4131 if (hlen > (*mp)->m_len) {
4132 if ((*mp = m_pullup(*mp, hlen)) == NULL)
4133 goto bad;
4134 ip = mtod(*mp, struct ip *);
4135 if (ip == NULL)
4136 goto bad;
4137 }
4138 ip->ip_sum = 0;
4139 if (hlen == sizeof(struct ip))
4140 ip->ip_sum = in_cksum_hdr(ip);
4141 else
4142 ip->ip_sum = in_cksum(*mp, hlen);
4143
4144 break;
4145 #endif /* INET */
4146 #ifdef INET6
4147 case ETHERTYPE_IPV6:
4148 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
4149 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) !=
4150 PFIL_PASS)
4151 break;
4152
4153 if (V_pfil_member && ifp != NULL) {
4154 rv = (dir == PFIL_OUT) ?
4155 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) :
4156 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL);
4157 if (rv != PFIL_PASS)
4158 break;
4159 }
4160
4161 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
4162 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) !=
4163 PFIL_PASS)
4164 break;
4165 break;
4166 #endif
4167 }
4168
4169 switch (rv) {
4170 case PFIL_CONSUMED:
4171 return (0);
4172 case PFIL_DROPPED:
4173 return (EACCES);
4174 default:
4175 break;
4176 }
4177
4178 error = -1;
4179
4180 /*
4181 * Finally, put everything back the way it was and return
4182 */
4183 if (snap) {
4184 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
4185 if (*mp == NULL)
4186 return (error);
4187 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
4188 }
4189
4190 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
4191 if (*mp == NULL)
4192 return (error);
4193 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
4194
4195 return (0);
4196
4197 bad:
4198 m_freem(*mp);
4199 *mp = NULL;
4200 return (error);
4201 }
4202
4203 #ifdef INET
4204 /*
4205 * Perform basic checks on header size since
4206 * pfil assumes ip_input has already processed
4207 * it for it. Cut-and-pasted from ip_input.c.
4208 * Given how simple the IPv6 version is,
4209 * does the IPv4 version really need to be
4210 * this complicated?
4211 *
4212 * XXX Should we update ipstat here, or not?
4213 * XXX Right now we update ipstat but not
4214 * XXX csum_counter.
4215 */
4216 static int
bridge_ip_checkbasic(struct mbuf ** mp)4217 bridge_ip_checkbasic(struct mbuf **mp)
4218 {
4219 struct mbuf *m = *mp;
4220 struct ip *ip;
4221 int len, hlen;
4222 u_short sum;
4223
4224 if (*mp == NULL)
4225 return (-1);
4226
4227 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
4228 if ((m = m_copyup(m, sizeof(struct ip),
4229 (max_linkhdr + 3) & ~3)) == NULL) {
4230 /* XXXJRT new stat, please */
4231 KMOD_IPSTAT_INC(ips_toosmall);
4232 goto bad;
4233 }
4234 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
4235 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
4236 KMOD_IPSTAT_INC(ips_toosmall);
4237 goto bad;
4238 }
4239 }
4240 ip = mtod(m, struct ip *);
4241 if (ip == NULL) goto bad;
4242
4243 if (ip->ip_v != IPVERSION) {
4244 KMOD_IPSTAT_INC(ips_badvers);
4245 goto bad;
4246 }
4247 hlen = ip->ip_hl << 2;
4248 if (hlen < sizeof(struct ip)) { /* minimum header length */
4249 KMOD_IPSTAT_INC(ips_badhlen);
4250 goto bad;
4251 }
4252 if (hlen > m->m_len) {
4253 if ((m = m_pullup(m, hlen)) == NULL) {
4254 KMOD_IPSTAT_INC(ips_badhlen);
4255 goto bad;
4256 }
4257 ip = mtod(m, struct ip *);
4258 if (ip == NULL) goto bad;
4259 }
4260
4261 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
4262 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
4263 } else {
4264 if (hlen == sizeof(struct ip)) {
4265 sum = in_cksum_hdr(ip);
4266 } else {
4267 sum = in_cksum(m, hlen);
4268 }
4269 }
4270 if (sum) {
4271 KMOD_IPSTAT_INC(ips_badsum);
4272 goto bad;
4273 }
4274
4275 /* Retrieve the packet length. */
4276 len = ntohs(ip->ip_len);
4277
4278 /*
4279 * Check for additional length bogosity
4280 */
4281 if (len < hlen) {
4282 KMOD_IPSTAT_INC(ips_badlen);
4283 goto bad;
4284 }
4285
4286 /*
4287 * Check that the amount of data in the buffers
4288 * is as at least much as the IP header would have us expect.
4289 * Drop packet if shorter than we expect.
4290 */
4291 if (m->m_pkthdr.len < len) {
4292 KMOD_IPSTAT_INC(ips_tooshort);
4293 goto bad;
4294 }
4295
4296 /* Checks out, proceed */
4297 *mp = m;
4298 return (0);
4299
4300 bad:
4301 *mp = m;
4302 return (-1);
4303 }
4304 #endif /* INET */
4305
4306 #ifdef INET6
4307 /*
4308 * Same as above, but for IPv6.
4309 * Cut-and-pasted from ip6_input.c.
4310 * XXX Should we update ip6stat, or not?
4311 */
4312 static int
bridge_ip6_checkbasic(struct mbuf ** mp)4313 bridge_ip6_checkbasic(struct mbuf **mp)
4314 {
4315 struct mbuf *m = *mp;
4316 struct ip6_hdr *ip6;
4317
4318 /*
4319 * If the IPv6 header is not aligned, slurp it up into a new
4320 * mbuf with space for link headers, in the event we forward
4321 * it. Otherwise, if it is aligned, make sure the entire base
4322 * IPv6 header is in the first mbuf of the chain.
4323 */
4324 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
4325 struct ifnet *inifp = m->m_pkthdr.rcvif;
4326 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
4327 (max_linkhdr + 3) & ~3)) == NULL) {
4328 /* XXXJRT new stat, please */
4329 IP6STAT_INC(ip6s_toosmall);
4330 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
4331 goto bad;
4332 }
4333 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
4334 struct ifnet *inifp = m->m_pkthdr.rcvif;
4335 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
4336 IP6STAT_INC(ip6s_toosmall);
4337 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
4338 goto bad;
4339 }
4340 }
4341
4342 ip6 = mtod(m, struct ip6_hdr *);
4343
4344 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
4345 IP6STAT_INC(ip6s_badvers);
4346 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
4347 goto bad;
4348 }
4349
4350 /* Checks out, proceed */
4351 *mp = m;
4352 return (0);
4353
4354 bad:
4355 *mp = m;
4356 return (-1);
4357 }
4358 #endif /* INET6 */
4359
4360 #ifdef INET
4361 /*
4362 * bridge_fragment:
4363 *
4364 * Fragment mbuf chain in multiple packets and prepend ethernet header.
4365 */
4366 static int
bridge_fragment(struct ifnet * ifp,struct mbuf ** mp,struct ether_header * eh,int snap,struct llc * llc)4367 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
4368 int snap, struct llc *llc)
4369 {
4370 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
4371 struct ip *ip;
4372 int error = -1;
4373
4374 if (m->m_len < sizeof(struct ip) &&
4375 (m = m_pullup(m, sizeof(struct ip))) == NULL)
4376 goto dropit;
4377 ip = mtod(m, struct ip *);
4378
4379 m->m_pkthdr.csum_flags |= CSUM_IP;
4380 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
4381 if (error)
4382 goto dropit;
4383
4384 /*
4385 * Walk the chain and re-add the Ethernet header for
4386 * each mbuf packet.
4387 */
4388 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
4389 nextpkt = mcur->m_nextpkt;
4390 mcur->m_nextpkt = NULL;
4391 if (snap) {
4392 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
4393 if (mcur == NULL) {
4394 error = ENOBUFS;
4395 if (mprev != NULL)
4396 mprev->m_nextpkt = nextpkt;
4397 goto dropit;
4398 }
4399 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
4400 }
4401
4402 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
4403 if (mcur == NULL) {
4404 error = ENOBUFS;
4405 if (mprev != NULL)
4406 mprev->m_nextpkt = nextpkt;
4407 goto dropit;
4408 }
4409 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
4410
4411 /*
4412 * The previous two M_PREPEND could have inserted one or two
4413 * mbufs in front so we have to update the previous packet's
4414 * m_nextpkt.
4415 */
4416 mcur->m_nextpkt = nextpkt;
4417 if (mprev != NULL)
4418 mprev->m_nextpkt = mcur;
4419 else {
4420 /* The first mbuf in the original chain needs to be
4421 * updated. */
4422 *mp = mcur;
4423 }
4424 mprev = mcur;
4425 }
4426
4427 KMOD_IPSTAT_INC(ips_fragmented);
4428 return (error);
4429
4430 dropit:
4431 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
4432 m = mcur->m_nextpkt;
4433 m_freem(mcur);
4434 }
4435 return (error);
4436 }
4437 #endif /* INET */
4438
4439 static void
bridge_linkstate(struct ifnet * ifp)4440 bridge_linkstate(struct ifnet *ifp)
4441 {
4442 struct bridge_softc *sc = NULL;
4443 struct bridge_iflist *bif;
4444 struct epoch_tracker et;
4445
4446 NET_EPOCH_ENTER(et);
4447
4448 bif = ifp->if_bridge;
4449 if (bif)
4450 sc = bif->bif_sc;
4451
4452 if (sc != NULL) {
4453 bridge_linkcheck(sc);
4454 bstp_linkstate(&bif->bif_stp);
4455 }
4456
4457 NET_EPOCH_EXIT(et);
4458 }
4459
4460 static void
bridge_linkcheck(struct bridge_softc * sc)4461 bridge_linkcheck(struct bridge_softc *sc)
4462 {
4463 struct bridge_iflist *bif;
4464 int new_link, hasls;
4465
4466 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
4467
4468 new_link = LINK_STATE_DOWN;
4469 hasls = 0;
4470 /* Our link is considered up if at least one of our ports is active */
4471 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
4472 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
4473 hasls++;
4474 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
4475 new_link = LINK_STATE_UP;
4476 break;
4477 }
4478 }
4479 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
4480 /* If no interfaces support link-state then we default to up */
4481 new_link = LINK_STATE_UP;
4482 }
4483 if_link_state_change(sc->sc_ifp, new_link);
4484 }
4485