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