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