1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright 2001 Wasabi Systems, Inc.
7 * All rights reserved.
8 *
9 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed for the NetBSD Project by
22 * Wasabi Systems, Inc.
23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
24 * or promote products derived from this software without specific prior
25 * written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 /*
41 * Copyright (c) 1999, 2000 Jason L. Wright ([email protected])
42 * All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
63 * POSSIBILITY OF SUCH DAMAGE.
64 *
65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
66 */
67
68 /*
69 * Network interface bridge support.
70 *
71 * TODO:
72 *
73 * - Currently only supports Ethernet-like interfaces (Ethernet,
74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
75 * to bridge other types of interfaces (maybe consider
76 * heterogeneous bridges).
77 */
78
79 #include <sys/cdefs.h>
80 __FBSDID("$FreeBSD$");
81
82 #include "opt_inet.h"
83 #include "opt_inet6.h"
84
85 #include <sys/param.h>
86 #include <sys/eventhandler.h>
87 #include <sys/mbuf.h>
88 #include <sys/malloc.h>
89 #include <sys/protosw.h>
90 #include <sys/systm.h>
91 #include <sys/jail.h>
92 #include <sys/time.h>
93 #include <sys/socket.h> /* for net/if.h */
94 #include <sys/sockio.h>
95 #include <sys/ctype.h> /* string functions */
96 #include <sys/kernel.h>
97 #include <sys/random.h>
98 #include <sys/syslog.h>
99 #include <sys/sysctl.h>
100 #include <vm/uma.h>
101 #include <sys/module.h>
102 #include <sys/priv.h>
103 #include <sys/proc.h>
104 #include <sys/lock.h>
105 #include <sys/mutex.h>
106
107 #include <net/bpf.h>
108 #include <net/if.h>
109 #include <net/if_clone.h>
110 #include <net/if_dl.h>
111 #include <net/if_types.h>
112 #include <net/if_var.h>
113 #include <net/pfil.h>
114 #include <net/vnet.h>
115
116 #include <netinet/in.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
121 #ifdef INET6
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
124 #include <netinet6/in6_ifattach.h>
125 #endif
126 #if defined(INET) || defined(INET6)
127 #include <netinet/ip_carp.h>
128 #endif
129 #include <machine/in_cksum.h>
130 #include <netinet/if_ether.h>
131 #include <net/bridgestp.h>
132 #include <net/if_bridgevar.h>
133 #include <net/if_llc.h>
134 #include <net/if_vlan_var.h>
135
136 #include <net/route.h>
137
138 /*
139 * Size of the route hash table. Must be a power of two.
140 */
141 #ifndef BRIDGE_RTHASH_SIZE
142 #define BRIDGE_RTHASH_SIZE 1024
143 #endif
144
145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
146
147 /*
148 * Default maximum number of addresses to cache.
149 */
150 #ifndef BRIDGE_RTABLE_MAX
151 #define BRIDGE_RTABLE_MAX 2000
152 #endif
153
154 /*
155 * Timeout (in seconds) for entries learned dynamically.
156 */
157 #ifndef BRIDGE_RTABLE_TIMEOUT
158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
159 #endif
160
161 /*
162 * Number of seconds between walks of the route list.
163 */
164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
166 #endif
167
168 /*
169 * List of capabilities to possibly mask on the member interface.
170 */
171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
172 IFCAP_TXCSUM_IPV6)
173
174 /*
175 * List of capabilities to strip
176 */
177 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
178
179 /*
180 * Bridge interface list entry.
181 */
182 struct bridge_iflist {
183 LIST_ENTRY(bridge_iflist) bif_next;
184 struct ifnet *bif_ifp; /* member if */
185 struct bstp_port bif_stp; /* STP state */
186 uint32_t bif_flags; /* member if flags */
187 int bif_savedcaps; /* saved capabilities */
188 uint32_t bif_addrmax; /* max # of addresses */
189 uint32_t bif_addrcnt; /* cur. # of addresses */
190 uint32_t bif_addrexceeded;/* # of address violations */
191 };
192
193 /*
194 * Bridge route node.
195 */
196 struct bridge_rtnode {
197 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
198 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
199 struct bridge_iflist *brt_dst; /* destination if */
200 unsigned long brt_expire; /* expiration time */
201 uint8_t brt_flags; /* address flags */
202 uint8_t brt_addr[ETHER_ADDR_LEN];
203 uint16_t brt_vlan; /* vlan id */
204 };
205 #define brt_ifp brt_dst->bif_ifp
206
207 /*
208 * Software state for each bridge.
209 */
210 struct bridge_softc {
211 struct ifnet *sc_ifp; /* make this an interface */
212 LIST_ENTRY(bridge_softc) sc_list;
213 struct mtx sc_mtx;
214 struct cv sc_cv;
215 uint32_t sc_brtmax; /* max # of addresses */
216 uint32_t sc_brtcnt; /* cur. # of addresses */
217 uint32_t sc_brttimeout; /* rt timeout in seconds */
218 struct callout sc_brcallout; /* bridge callout */
219 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
220 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
221 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
222 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
223 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
224 uint32_t sc_rthash_key; /* key for hash */
225 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
226 struct bstp_state sc_stp; /* STP state */
227 uint32_t sc_brtexceeded; /* # of cache drops */
228 struct ifnet *sc_ifaddr; /* member mac copied from */
229 struct ether_addr sc_defaddr; /* Default MAC address */
230 };
231
232 VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
233 #define V_bridge_list_mtx VNET(bridge_list_mtx)
234 static eventhandler_tag bridge_detach_cookie;
235
236 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
237
238 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
239 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone)
240
241 static int bridge_clone_create(struct if_clone *, int, caddr_t);
242 static void bridge_clone_destroy(struct ifnet *);
243
244 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
245 static void bridge_mutecaps(struct bridge_softc *);
246 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
247 int);
248 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
249 static void bridge_init(void *);
250 static void bridge_dummynet(struct mbuf *, struct ifnet *);
251 static void bridge_stop(struct ifnet *, int);
252 static int bridge_transmit(struct ifnet *, struct mbuf *);
253 static void bridge_qflush(struct ifnet *);
254 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
255 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
256 struct rtentry *);
257 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
258 struct mbuf *);
259 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
260
261 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
262 struct mbuf *m);
263
264 static void bridge_timer(void *);
265
266 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
267 struct mbuf *, int);
268 static void bridge_span(struct bridge_softc *, struct mbuf *);
269
270 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
271 uint16_t, struct bridge_iflist *, int, uint8_t);
272 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
273 uint16_t);
274 static void bridge_rttrim(struct bridge_softc *);
275 static void bridge_rtage(struct bridge_softc *);
276 static void bridge_rtflush(struct bridge_softc *, int);
277 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
278 uint16_t);
279
280 static void bridge_rtable_init(struct bridge_softc *);
281 static void bridge_rtable_fini(struct bridge_softc *);
282
283 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
284 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
285 const uint8_t *, uint16_t);
286 static int bridge_rtnode_insert(struct bridge_softc *,
287 struct bridge_rtnode *);
288 static void bridge_rtnode_destroy(struct bridge_softc *,
289 struct bridge_rtnode *);
290 static void bridge_rtable_expire(struct ifnet *, int);
291 static void bridge_state_change(struct ifnet *, int);
292
293 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
294 const char *name);
295 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
296 struct ifnet *ifp);
297 static void bridge_delete_member(struct bridge_softc *,
298 struct bridge_iflist *, int);
299 static void bridge_delete_span(struct bridge_softc *,
300 struct bridge_iflist *);
301
302 static int bridge_ioctl_add(struct bridge_softc *, void *);
303 static int bridge_ioctl_del(struct bridge_softc *, void *);
304 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
305 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
306 static int bridge_ioctl_scache(struct bridge_softc *, void *);
307 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
308 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
309 static int bridge_ioctl_rts(struct bridge_softc *, void *);
310 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
311 static int bridge_ioctl_sto(struct bridge_softc *, void *);
312 static int bridge_ioctl_gto(struct bridge_softc *, void *);
313 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
314 static int bridge_ioctl_flush(struct bridge_softc *, void *);
315 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
316 static int bridge_ioctl_spri(struct bridge_softc *, void *);
317 static int bridge_ioctl_ght(struct bridge_softc *, void *);
318 static int bridge_ioctl_sht(struct bridge_softc *, void *);
319 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
320 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
321 static int bridge_ioctl_gma(struct bridge_softc *, void *);
322 static int bridge_ioctl_sma(struct bridge_softc *, void *);
323 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
324 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
325 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
326 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
327 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
328 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
329 static int bridge_ioctl_grte(struct bridge_softc *, void *);
330 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
331 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
332 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
333 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
334 int);
335 static int bridge_ip_checkbasic(struct mbuf **mp);
336 #ifdef INET6
337 static int bridge_ip6_checkbasic(struct mbuf **mp);
338 #endif /* INET6 */
339 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
340 struct ether_header *, int, struct llc *);
341 static void bridge_linkstate(struct ifnet *ifp);
342 static void bridge_linkcheck(struct bridge_softc *sc);
343
344
345 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
346 #define VLANTAGOF(_m) \
347 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
348
349 static struct bstp_cb_ops bridge_ops = {
350 .bcb_state = bridge_state_change,
351 .bcb_rtage = bridge_rtable_expire
352 };
353
354 SYSCTL_DECL(_net_link);
355 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
356
357 /* only pass IP[46] packets when pfil is enabled */
358 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
359 #define V_pfil_onlyip VNET(pfil_onlyip)
360 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
361 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
362 "Only pass IP packets when pfil is enabled");
363
364 /* run pfil hooks on the bridge interface */
365 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
366 #define V_pfil_bridge VNET(pfil_bridge)
367 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
368 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
369 "Packet filter on the bridge interface");
370
371 /* layer2 filter with ipfw */
372 VNET_DEFINE_STATIC(int, pfil_ipfw);
373 #define V_pfil_ipfw VNET(pfil_ipfw)
374
375 /* layer2 ARP filter with ipfw */
376 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
377 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
378 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
379 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
380 "Filter ARP packets through IPFW layer2");
381
382 /* run pfil hooks on the member interface */
383 VNET_DEFINE_STATIC(int, pfil_member) = 1;
384 #define V_pfil_member VNET(pfil_member)
385 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
386 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
387 "Packet filter on the member interface");
388
389 /* run pfil hooks on the physical interface for locally destined packets */
390 VNET_DEFINE_STATIC(int, pfil_local_phys);
391 #define V_pfil_local_phys VNET(pfil_local_phys)
392 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
393 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
394 "Packet filter on the physical interface for locally destined packets");
395
396 /* log STP state changes */
397 VNET_DEFINE_STATIC(int, log_stp);
398 #define V_log_stp VNET(log_stp)
399 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
400 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
401 "Log STP state changes");
402
403 /* share MAC with first bridge member */
404 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
405 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
406 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
407 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
408 "Inherit MAC address from the first bridge member");
409
410 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
411 #define V_allow_llz_overlap VNET(allow_llz_overlap)
412 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
413 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
414 "Allow overlap of link-local scope "
415 "zones of a bridge interface and the member interfaces");
416
417 struct bridge_control {
418 int (*bc_func)(struct bridge_softc *, void *);
419 int bc_argsize;
420 int bc_flags;
421 };
422
423 #define BC_F_COPYIN 0x01 /* copy arguments in */
424 #define BC_F_COPYOUT 0x02 /* copy arguments out */
425 #define BC_F_SUSER 0x04 /* do super-user check */
426
427 const struct bridge_control bridge_control_table[] = {
428 { bridge_ioctl_add, sizeof(struct ifbreq),
429 BC_F_COPYIN|BC_F_SUSER },
430 { bridge_ioctl_del, sizeof(struct ifbreq),
431 BC_F_COPYIN|BC_F_SUSER },
432
433 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
434 BC_F_COPYIN|BC_F_COPYOUT },
435 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
436 BC_F_COPYIN|BC_F_SUSER },
437
438 { bridge_ioctl_scache, sizeof(struct ifbrparam),
439 BC_F_COPYIN|BC_F_SUSER },
440 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
441 BC_F_COPYOUT },
442
443 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
444 BC_F_COPYIN|BC_F_COPYOUT },
445 { bridge_ioctl_rts, sizeof(struct ifbaconf),
446 BC_F_COPYIN|BC_F_COPYOUT },
447
448 { bridge_ioctl_saddr, sizeof(struct ifbareq),
449 BC_F_COPYIN|BC_F_SUSER },
450
451 { bridge_ioctl_sto, sizeof(struct ifbrparam),
452 BC_F_COPYIN|BC_F_SUSER },
453 { bridge_ioctl_gto, sizeof(struct ifbrparam),
454 BC_F_COPYOUT },
455
456 { bridge_ioctl_daddr, sizeof(struct ifbareq),
457 BC_F_COPYIN|BC_F_SUSER },
458
459 { bridge_ioctl_flush, sizeof(struct ifbreq),
460 BC_F_COPYIN|BC_F_SUSER },
461
462 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
463 BC_F_COPYOUT },
464 { bridge_ioctl_spri, sizeof(struct ifbrparam),
465 BC_F_COPYIN|BC_F_SUSER },
466
467 { bridge_ioctl_ght, sizeof(struct ifbrparam),
468 BC_F_COPYOUT },
469 { bridge_ioctl_sht, sizeof(struct ifbrparam),
470 BC_F_COPYIN|BC_F_SUSER },
471
472 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
473 BC_F_COPYOUT },
474 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
475 BC_F_COPYIN|BC_F_SUSER },
476
477 { bridge_ioctl_gma, sizeof(struct ifbrparam),
478 BC_F_COPYOUT },
479 { bridge_ioctl_sma, sizeof(struct ifbrparam),
480 BC_F_COPYIN|BC_F_SUSER },
481
482 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
483 BC_F_COPYIN|BC_F_SUSER },
484
485 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
486 BC_F_COPYIN|BC_F_SUSER },
487
488 { bridge_ioctl_addspan, sizeof(struct ifbreq),
489 BC_F_COPYIN|BC_F_SUSER },
490 { bridge_ioctl_delspan, sizeof(struct ifbreq),
491 BC_F_COPYIN|BC_F_SUSER },
492
493 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
494 BC_F_COPYOUT },
495
496 { bridge_ioctl_grte, sizeof(struct ifbrparam),
497 BC_F_COPYOUT },
498
499 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
500 BC_F_COPYIN|BC_F_COPYOUT },
501
502 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
503 BC_F_COPYIN|BC_F_SUSER },
504
505 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
506 BC_F_COPYIN|BC_F_SUSER },
507
508 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
509 BC_F_COPYIN|BC_F_SUSER },
510
511 };
512 const int bridge_control_table_size = nitems(bridge_control_table);
513
514 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
515 #define V_bridge_list VNET(bridge_list)
516 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
517 "if_bridge list", NULL, MTX_DEF)
518 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
519 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
520 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
521
522 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
523 #define V_bridge_cloner VNET(bridge_cloner)
524
525 static const char bridge_name[] = "bridge";
526
527 static void
vnet_bridge_init(const void * unused __unused)528 vnet_bridge_init(const void *unused __unused)
529 {
530
531 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
532 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
533 UMA_ALIGN_PTR, 0);
534 BRIDGE_LIST_LOCK_INIT();
535 LIST_INIT(&V_bridge_list);
536 V_bridge_cloner = if_clone_simple(bridge_name,
537 bridge_clone_create, bridge_clone_destroy, 0);
538 }
539 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
540 vnet_bridge_init, NULL);
541
542 static void
vnet_bridge_uninit(const void * unused __unused)543 vnet_bridge_uninit(const void *unused __unused)
544 {
545
546 if_clone_detach(V_bridge_cloner);
547 V_bridge_cloner = NULL;
548 BRIDGE_LIST_LOCK_DESTROY();
549 uma_zdestroy(V_bridge_rtnode_zone);
550 }
551 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
552 vnet_bridge_uninit, NULL);
553
554 static int
bridge_modevent(module_t mod,int type,void * data)555 bridge_modevent(module_t mod, int type, void *data)
556 {
557
558 switch (type) {
559 case MOD_LOAD:
560 bridge_dn_p = bridge_dummynet;
561 bridge_detach_cookie = EVENTHANDLER_REGISTER(
562 ifnet_departure_event, bridge_ifdetach, NULL,
563 EVENTHANDLER_PRI_ANY);
564 break;
565 case MOD_UNLOAD:
566 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
567 bridge_detach_cookie);
568 bridge_dn_p = NULL;
569 break;
570 default:
571 return (EOPNOTSUPP);
572 }
573 return (0);
574 }
575
576 static moduledata_t bridge_mod = {
577 "if_bridge",
578 bridge_modevent,
579 0
580 };
581
582 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
583 MODULE_VERSION(if_bridge, 1);
584 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
585
586 /*
587 * handler for net.link.bridge.ipfw
588 */
589 static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)590 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
591 {
592 int enable = V_pfil_ipfw;
593 int error;
594
595 error = sysctl_handle_int(oidp, &enable, 0, req);
596 enable &= 1;
597
598 if (enable != V_pfil_ipfw) {
599 V_pfil_ipfw = enable;
600
601 /*
602 * Disable pfil so that ipfw doesnt run twice, if the user
603 * really wants both then they can re-enable pfil_bridge and/or
604 * pfil_member. Also allow non-ip packets as ipfw can filter by
605 * layer2 type.
606 */
607 if (V_pfil_ipfw) {
608 V_pfil_onlyip = 0;
609 V_pfil_bridge = 0;
610 V_pfil_member = 0;
611 }
612 }
613
614 return (error);
615 }
616 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
617 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
618 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
619 "Layer2 filter with IPFW");
620
621 /*
622 * bridge_clone_create:
623 *
624 * Create a new bridge instance.
625 */
626 static int
bridge_clone_create(struct if_clone * ifc,int unit,caddr_t params)627 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
628 {
629 struct bridge_softc *sc, *sc2;
630 struct ifnet *bifp, *ifp;
631 int fb, retry;
632 unsigned long hostid;
633
634 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
635 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
636 if (ifp == NULL) {
637 free(sc, M_DEVBUF);
638 return (ENOSPC);
639 }
640
641 BRIDGE_LOCK_INIT(sc);
642 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
643 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
644
645 /* Initialize our routing table. */
646 bridge_rtable_init(sc);
647
648 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
649
650 LIST_INIT(&sc->sc_iflist);
651 LIST_INIT(&sc->sc_spanlist);
652
653 ifp->if_softc = sc;
654 if_initname(ifp, bridge_name, unit);
655 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
656 ifp->if_ioctl = bridge_ioctl;
657 ifp->if_transmit = bridge_transmit;
658 ifp->if_qflush = bridge_qflush;
659 ifp->if_init = bridge_init;
660 ifp->if_type = IFT_BRIDGE;
661
662 /*
663 * Generate an ethernet address with a locally administered address.
664 *
665 * Since we are using random ethernet addresses for the bridge, it is
666 * possible that we might have address collisions, so make sure that
667 * this hardware address isn't already in use on another bridge.
668 * The first try uses the hostid and falls back to arc4rand().
669 */
670 fb = 0;
671 getcredhostid(curthread->td_ucred, &hostid);
672 do {
673 if (fb || hostid == 0) {
674 ether_gen_addr(ifp, &sc->sc_defaddr);
675 } else {
676 sc->sc_defaddr.octet[0] = 0x2;
677 sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff;
678 sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff;
679 sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff;
680 sc->sc_defaddr.octet[4] = hostid & 0xff;
681 sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff;
682 }
683
684 fb = 1;
685 retry = 0;
686 BRIDGE_LIST_LOCK();
687 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
688 bifp = sc2->sc_ifp;
689 if (memcmp(sc->sc_defaddr.octet,
690 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
691 retry = 1;
692 break;
693 }
694 }
695 BRIDGE_LIST_UNLOCK();
696 } while (retry == 1);
697
698 bstp_attach(&sc->sc_stp, &bridge_ops);
699 ether_ifattach(ifp, sc->sc_defaddr.octet);
700 /* Now undo some of the damage... */
701 ifp->if_baudrate = 0;
702 ifp->if_type = IFT_BRIDGE;
703
704 BRIDGE_LIST_LOCK();
705 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
706 BRIDGE_LIST_UNLOCK();
707
708 return (0);
709 }
710
711 /*
712 * bridge_clone_destroy:
713 *
714 * Destroy a bridge instance.
715 */
716 static void
bridge_clone_destroy(struct ifnet * ifp)717 bridge_clone_destroy(struct ifnet *ifp)
718 {
719 struct bridge_softc *sc = ifp->if_softc;
720 struct bridge_iflist *bif;
721
722 BRIDGE_LOCK(sc);
723
724 bridge_stop(ifp, 1);
725 ifp->if_flags &= ~IFF_UP;
726
727 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
728 bridge_delete_member(sc, bif, 0);
729
730 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
731 bridge_delete_span(sc, bif);
732 }
733
734 /* Tear down the routing table. */
735 bridge_rtable_fini(sc);
736
737 BRIDGE_UNLOCK(sc);
738
739 callout_drain(&sc->sc_brcallout);
740
741 BRIDGE_LIST_LOCK();
742 LIST_REMOVE(sc, sc_list);
743 BRIDGE_LIST_UNLOCK();
744
745 bstp_detach(&sc->sc_stp);
746 ether_ifdetach(ifp);
747 if_free(ifp);
748
749 BRIDGE_LOCK_DESTROY(sc);
750 free(sc, M_DEVBUF);
751 }
752
753 /*
754 * bridge_ioctl:
755 *
756 * Handle a control request from the operator.
757 */
758 static int
bridge_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)759 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
760 {
761 struct bridge_softc *sc = ifp->if_softc;
762 struct ifreq *ifr = (struct ifreq *)data;
763 struct bridge_iflist *bif;
764 struct thread *td = curthread;
765 union {
766 struct ifbreq ifbreq;
767 struct ifbifconf ifbifconf;
768 struct ifbareq ifbareq;
769 struct ifbaconf ifbaconf;
770 struct ifbrparam ifbrparam;
771 struct ifbropreq ifbropreq;
772 } args;
773 struct ifdrv *ifd = (struct ifdrv *) data;
774 const struct bridge_control *bc;
775 int error = 0;
776
777 switch (cmd) {
778
779 case SIOCADDMULTI:
780 case SIOCDELMULTI:
781 break;
782
783 case SIOCGDRVSPEC:
784 case SIOCSDRVSPEC:
785 if (ifd->ifd_cmd >= bridge_control_table_size) {
786 error = EINVAL;
787 break;
788 }
789 bc = &bridge_control_table[ifd->ifd_cmd];
790
791 if (cmd == SIOCGDRVSPEC &&
792 (bc->bc_flags & BC_F_COPYOUT) == 0) {
793 error = EINVAL;
794 break;
795 }
796 else if (cmd == SIOCSDRVSPEC &&
797 (bc->bc_flags & BC_F_COPYOUT) != 0) {
798 error = EINVAL;
799 break;
800 }
801
802 if (bc->bc_flags & BC_F_SUSER) {
803 error = priv_check(td, PRIV_NET_BRIDGE);
804 if (error)
805 break;
806 }
807
808 if (ifd->ifd_len != bc->bc_argsize ||
809 ifd->ifd_len > sizeof(args)) {
810 error = EINVAL;
811 break;
812 }
813
814 bzero(&args, sizeof(args));
815 if (bc->bc_flags & BC_F_COPYIN) {
816 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
817 if (error)
818 break;
819 }
820
821 BRIDGE_LOCK(sc);
822 error = (*bc->bc_func)(sc, &args);
823 BRIDGE_UNLOCK(sc);
824 if (error)
825 break;
826
827 if (bc->bc_flags & BC_F_COPYOUT)
828 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
829
830 break;
831
832 case SIOCSIFFLAGS:
833 if (!(ifp->if_flags & IFF_UP) &&
834 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
835 /*
836 * If interface is marked down and it is running,
837 * then stop and disable it.
838 */
839 BRIDGE_LOCK(sc);
840 bridge_stop(ifp, 1);
841 BRIDGE_UNLOCK(sc);
842 } else if ((ifp->if_flags & IFF_UP) &&
843 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
844 /*
845 * If interface is marked up and it is stopped, then
846 * start it.
847 */
848 (*ifp->if_init)(sc);
849 }
850 break;
851
852 case SIOCSIFMTU:
853 if (ifr->ifr_mtu < 576) {
854 error = EINVAL;
855 break;
856 }
857 if (LIST_EMPTY(&sc->sc_iflist)) {
858 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
859 break;
860 }
861 BRIDGE_LOCK(sc);
862 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
863 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
864 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
865 " != %d\n", sc->sc_ifp->if_xname,
866 bif->bif_ifp->if_mtu,
867 bif->bif_ifp->if_xname, ifr->ifr_mtu);
868 error = EINVAL;
869 break;
870 }
871 }
872 if (!error)
873 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
874 BRIDGE_UNLOCK(sc);
875 break;
876 default:
877 /*
878 * drop the lock as ether_ioctl() will call bridge_start() and
879 * cause the lock to be recursed.
880 */
881 error = ether_ioctl(ifp, cmd, data);
882 break;
883 }
884
885 return (error);
886 }
887
888 /*
889 * bridge_mutecaps:
890 *
891 * Clear or restore unwanted capabilities on the member interface
892 */
893 static void
bridge_mutecaps(struct bridge_softc * sc)894 bridge_mutecaps(struct bridge_softc *sc)
895 {
896 struct bridge_iflist *bif;
897 int enabled, mask;
898
899 /* Initial bitmask of capabilities to test */
900 mask = BRIDGE_IFCAPS_MASK;
901
902 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
903 /* Every member must support it or its disabled */
904 mask &= bif->bif_savedcaps;
905 }
906
907 BRIDGE_XLOCK(sc);
908 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
909 enabled = bif->bif_ifp->if_capenable;
910 enabled &= ~BRIDGE_IFCAPS_STRIP;
911 /* strip off mask bits and enable them again if allowed */
912 enabled &= ~BRIDGE_IFCAPS_MASK;
913 enabled |= mask;
914 BRIDGE_UNLOCK(sc);
915 bridge_set_ifcap(sc, bif, enabled);
916 BRIDGE_LOCK(sc);
917 }
918 BRIDGE_XDROP(sc);
919
920 }
921
922 static void
bridge_set_ifcap(struct bridge_softc * sc,struct bridge_iflist * bif,int set)923 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
924 {
925 struct ifnet *ifp = bif->bif_ifp;
926 struct ifreq ifr;
927 int error, mask, stuck;
928
929 BRIDGE_UNLOCK_ASSERT(sc);
930
931 bzero(&ifr, sizeof(ifr));
932 ifr.ifr_reqcap = set;
933
934 if (ifp->if_capenable != set) {
935 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
936 if (error)
937 if_printf(sc->sc_ifp,
938 "error setting capabilities on %s: %d\n",
939 ifp->if_xname, error);
940 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
941 stuck = ifp->if_capenable & mask & ~set;
942 if (stuck != 0)
943 if_printf(sc->sc_ifp,
944 "can't disable some capabilities on %s: 0x%x\n",
945 ifp->if_xname, stuck);
946 }
947 }
948
949 /*
950 * bridge_lookup_member:
951 *
952 * Lookup a bridge member interface.
953 */
954 static struct bridge_iflist *
bridge_lookup_member(struct bridge_softc * sc,const char * name)955 bridge_lookup_member(struct bridge_softc *sc, const char *name)
956 {
957 struct bridge_iflist *bif;
958 struct ifnet *ifp;
959
960 BRIDGE_LOCK_ASSERT(sc);
961
962 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
963 ifp = bif->bif_ifp;
964 if (strcmp(ifp->if_xname, name) == 0)
965 return (bif);
966 }
967
968 return (NULL);
969 }
970
971 /*
972 * bridge_lookup_member_if:
973 *
974 * Lookup a bridge member interface by ifnet*.
975 */
976 static struct bridge_iflist *
bridge_lookup_member_if(struct bridge_softc * sc,struct ifnet * member_ifp)977 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
978 {
979 struct bridge_iflist *bif;
980
981 BRIDGE_LOCK_ASSERT(sc);
982
983 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
984 if (bif->bif_ifp == member_ifp)
985 return (bif);
986 }
987
988 return (NULL);
989 }
990
991 /*
992 * bridge_delete_member:
993 *
994 * Delete the specified member interface.
995 */
996 static void
bridge_delete_member(struct bridge_softc * sc,struct bridge_iflist * bif,int gone)997 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
998 int gone)
999 {
1000 struct ifnet *ifs = bif->bif_ifp;
1001 struct ifnet *fif = NULL;
1002
1003 BRIDGE_LOCK_ASSERT(sc);
1004
1005 if (bif->bif_flags & IFBIF_STP)
1006 bstp_disable(&bif->bif_stp);
1007
1008 ifs->if_bridge = NULL;
1009 BRIDGE_XLOCK(sc);
1010 LIST_REMOVE(bif, bif_next);
1011 BRIDGE_XDROP(sc);
1012
1013 /*
1014 * If removing the interface that gave the bridge its mac address, set
1015 * the mac address of the bridge to the address of the next member, or
1016 * to its default address if no members are left.
1017 */
1018 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1019 if (LIST_EMPTY(&sc->sc_iflist)) {
1020 bcopy(&sc->sc_defaddr,
1021 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1022 sc->sc_ifaddr = NULL;
1023 } else {
1024 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1025 bcopy(IF_LLADDR(fif),
1026 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1027 sc->sc_ifaddr = fif;
1028 }
1029 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1030 }
1031
1032 bridge_linkcheck(sc);
1033 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1034 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1035 KASSERT(bif->bif_addrcnt == 0,
1036 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1037
1038 ifs->if_bridge_output = NULL;
1039 ifs->if_bridge_input = NULL;
1040 ifs->if_bridge_linkstate = NULL;
1041 BRIDGE_UNLOCK(sc);
1042 if (!gone) {
1043 switch (ifs->if_type) {
1044 case IFT_ETHER:
1045 case IFT_L2VLAN:
1046 /*
1047 * Take the interface out of promiscuous mode, but only
1048 * if it was promiscuous in the first place. It might
1049 * not be if we're in the bridge_ioctl_add() error path.
1050 */
1051 if (ifs->if_flags & IFF_PROMISC)
1052 (void) ifpromisc(ifs, 0);
1053 break;
1054
1055 case IFT_GIF:
1056 break;
1057
1058 default:
1059 #ifdef DIAGNOSTIC
1060 panic("bridge_delete_member: impossible");
1061 #endif
1062 break;
1063 }
1064 /* reneable any interface capabilities */
1065 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1066 }
1067 bstp_destroy(&bif->bif_stp); /* prepare to free */
1068 BRIDGE_LOCK(sc);
1069 free(bif, M_DEVBUF);
1070 }
1071
1072 /*
1073 * bridge_delete_span:
1074 *
1075 * Delete the specified span interface.
1076 */
1077 static void
bridge_delete_span(struct bridge_softc * sc,struct bridge_iflist * bif)1078 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1079 {
1080 BRIDGE_LOCK_ASSERT(sc);
1081
1082 KASSERT(bif->bif_ifp->if_bridge == NULL,
1083 ("%s: not a span interface", __func__));
1084
1085 LIST_REMOVE(bif, bif_next);
1086 free(bif, M_DEVBUF);
1087 }
1088
1089 static int
bridge_ioctl_add(struct bridge_softc * sc,void * arg)1090 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1091 {
1092 struct ifbreq *req = arg;
1093 struct bridge_iflist *bif = NULL;
1094 struct ifnet *ifs;
1095 int error = 0;
1096
1097 ifs = ifunit(req->ifbr_ifsname);
1098 if (ifs == NULL)
1099 return (ENOENT);
1100 if (ifs->if_ioctl == NULL) /* must be supported */
1101 return (EINVAL);
1102
1103 /* If it's in the span list, it can't be a member. */
1104 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1105 if (ifs == bif->bif_ifp)
1106 return (EBUSY);
1107
1108 if (ifs->if_bridge == sc)
1109 return (EEXIST);
1110
1111 if (ifs->if_bridge != NULL)
1112 return (EBUSY);
1113
1114 switch (ifs->if_type) {
1115 case IFT_ETHER:
1116 case IFT_L2VLAN:
1117 case IFT_GIF:
1118 /* permitted interface types */
1119 break;
1120 default:
1121 return (EINVAL);
1122 }
1123
1124 #ifdef INET6
1125 /*
1126 * Two valid inet6 addresses with link-local scope must not be
1127 * on the parent interface and the member interfaces at the
1128 * same time. This restriction is needed to prevent violation
1129 * of link-local scope zone. Attempts to add a member
1130 * interface which has inet6 addresses when the parent has
1131 * inet6 triggers removal of all inet6 addresses on the member
1132 * interface.
1133 */
1134
1135 /* Check if the parent interface has a link-local scope addr. */
1136 if (V_allow_llz_overlap == 0 &&
1137 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1138 /*
1139 * If any, remove all inet6 addresses from the member
1140 * interfaces.
1141 */
1142 BRIDGE_XLOCK(sc);
1143 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1144 if (in6ifa_llaonifp(bif->bif_ifp)) {
1145 BRIDGE_UNLOCK(sc);
1146 in6_ifdetach(bif->bif_ifp);
1147 BRIDGE_LOCK(sc);
1148 if_printf(sc->sc_ifp,
1149 "IPv6 addresses on %s have been removed "
1150 "before adding it as a member to prevent "
1151 "IPv6 address scope violation.\n",
1152 bif->bif_ifp->if_xname);
1153 }
1154 }
1155 BRIDGE_XDROP(sc);
1156 if (in6ifa_llaonifp(ifs)) {
1157 BRIDGE_UNLOCK(sc);
1158 in6_ifdetach(ifs);
1159 BRIDGE_LOCK(sc);
1160 if_printf(sc->sc_ifp,
1161 "IPv6 addresses on %s have been removed "
1162 "before adding it as a member to prevent "
1163 "IPv6 address scope violation.\n",
1164 ifs->if_xname);
1165 }
1166 }
1167 #endif
1168 /* Allow the first Ethernet member to define the MTU */
1169 if (LIST_EMPTY(&sc->sc_iflist))
1170 sc->sc_ifp->if_mtu = ifs->if_mtu;
1171 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1172 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1173 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1174 return (EINVAL);
1175 }
1176
1177 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1178 if (bif == NULL)
1179 return (ENOMEM);
1180
1181 bif->bif_ifp = ifs;
1182 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1183 bif->bif_savedcaps = ifs->if_capenable;
1184
1185 /*
1186 * Assign the interface's MAC address to the bridge if it's the first
1187 * member and the MAC address of the bridge has not been changed from
1188 * the default randomly generated one.
1189 */
1190 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1191 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1192 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1193 sc->sc_ifaddr = ifs;
1194 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1195 }
1196
1197 ifs->if_bridge = sc;
1198 ifs->if_bridge_output = bridge_output;
1199 ifs->if_bridge_input = bridge_input;
1200 ifs->if_bridge_linkstate = bridge_linkstate;
1201 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1202 /*
1203 * XXX: XLOCK HERE!?!
1204 *
1205 * NOTE: insert_***HEAD*** should be safe for the traversals.
1206 */
1207 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1208
1209 /* Set interface capabilities to the intersection set of all members */
1210 bridge_mutecaps(sc);
1211 bridge_linkcheck(sc);
1212
1213 /* Place the interface into promiscuous mode */
1214 switch (ifs->if_type) {
1215 case IFT_ETHER:
1216 case IFT_L2VLAN:
1217 BRIDGE_UNLOCK(sc);
1218 error = ifpromisc(ifs, 1);
1219 BRIDGE_LOCK(sc);
1220 break;
1221 }
1222
1223 if (error)
1224 bridge_delete_member(sc, bif, 0);
1225 return (error);
1226 }
1227
1228 static int
bridge_ioctl_del(struct bridge_softc * sc,void * arg)1229 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1230 {
1231 struct ifbreq *req = arg;
1232 struct bridge_iflist *bif;
1233
1234 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1235 if (bif == NULL)
1236 return (ENOENT);
1237
1238 bridge_delete_member(sc, bif, 0);
1239
1240 return (0);
1241 }
1242
1243 static int
bridge_ioctl_gifflags(struct bridge_softc * sc,void * arg)1244 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1245 {
1246 struct ifbreq *req = arg;
1247 struct bridge_iflist *bif;
1248 struct bstp_port *bp;
1249
1250 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1251 if (bif == NULL)
1252 return (ENOENT);
1253
1254 bp = &bif->bif_stp;
1255 req->ifbr_ifsflags = bif->bif_flags;
1256 req->ifbr_state = bp->bp_state;
1257 req->ifbr_priority = bp->bp_priority;
1258 req->ifbr_path_cost = bp->bp_path_cost;
1259 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1260 req->ifbr_proto = bp->bp_protover;
1261 req->ifbr_role = bp->bp_role;
1262 req->ifbr_stpflags = bp->bp_flags;
1263 req->ifbr_addrcnt = bif->bif_addrcnt;
1264 req->ifbr_addrmax = bif->bif_addrmax;
1265 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1266
1267 /* Copy STP state options as flags */
1268 if (bp->bp_operedge)
1269 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1270 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1271 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1272 if (bp->bp_ptp_link)
1273 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1274 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1275 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1276 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1277 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1278 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1279 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1280 return (0);
1281 }
1282
1283 static int
bridge_ioctl_sifflags(struct bridge_softc * sc,void * arg)1284 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1285 {
1286 struct ifbreq *req = arg;
1287 struct bridge_iflist *bif;
1288 struct bstp_port *bp;
1289 int error;
1290
1291 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1292 if (bif == NULL)
1293 return (ENOENT);
1294 bp = &bif->bif_stp;
1295
1296 if (req->ifbr_ifsflags & IFBIF_SPAN)
1297 /* SPAN is readonly */
1298 return (EINVAL);
1299
1300 if (req->ifbr_ifsflags & IFBIF_STP) {
1301 if ((bif->bif_flags & IFBIF_STP) == 0) {
1302 error = bstp_enable(&bif->bif_stp);
1303 if (error)
1304 return (error);
1305 }
1306 } else {
1307 if ((bif->bif_flags & IFBIF_STP) != 0)
1308 bstp_disable(&bif->bif_stp);
1309 }
1310
1311 /* Pass on STP flags */
1312 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1313 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1314 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1315 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1316
1317 /* Save the bits relating to the bridge */
1318 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1319
1320 return (0);
1321 }
1322
1323 static int
bridge_ioctl_scache(struct bridge_softc * sc,void * arg)1324 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1325 {
1326 struct ifbrparam *param = arg;
1327
1328 sc->sc_brtmax = param->ifbrp_csize;
1329 bridge_rttrim(sc);
1330
1331 return (0);
1332 }
1333
1334 static int
bridge_ioctl_gcache(struct bridge_softc * sc,void * arg)1335 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1336 {
1337 struct ifbrparam *param = arg;
1338
1339 param->ifbrp_csize = sc->sc_brtmax;
1340
1341 return (0);
1342 }
1343
1344 static int
bridge_ioctl_gifs(struct bridge_softc * sc,void * arg)1345 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1346 {
1347 struct ifbifconf *bifc = arg;
1348 struct bridge_iflist *bif;
1349 struct ifbreq breq;
1350 char *buf, *outbuf;
1351 int count, buflen, len, error = 0;
1352
1353 count = 0;
1354 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1355 count++;
1356 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1357 count++;
1358
1359 buflen = sizeof(breq) * count;
1360 if (bifc->ifbic_len == 0) {
1361 bifc->ifbic_len = buflen;
1362 return (0);
1363 }
1364 BRIDGE_UNLOCK(sc);
1365 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1366 BRIDGE_LOCK(sc);
1367
1368 count = 0;
1369 buf = outbuf;
1370 len = min(bifc->ifbic_len, buflen);
1371 bzero(&breq, sizeof(breq));
1372 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1373 if (len < sizeof(breq))
1374 break;
1375
1376 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1377 sizeof(breq.ifbr_ifsname));
1378 /* Fill in the ifbreq structure */
1379 error = bridge_ioctl_gifflags(sc, &breq);
1380 if (error)
1381 break;
1382 memcpy(buf, &breq, sizeof(breq));
1383 count++;
1384 buf += sizeof(breq);
1385 len -= sizeof(breq);
1386 }
1387 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1388 if (len < sizeof(breq))
1389 break;
1390
1391 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1392 sizeof(breq.ifbr_ifsname));
1393 breq.ifbr_ifsflags = bif->bif_flags;
1394 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1395 memcpy(buf, &breq, sizeof(breq));
1396 count++;
1397 buf += sizeof(breq);
1398 len -= sizeof(breq);
1399 }
1400
1401 BRIDGE_UNLOCK(sc);
1402 bifc->ifbic_len = sizeof(breq) * count;
1403 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1404 BRIDGE_LOCK(sc);
1405 free(outbuf, M_TEMP);
1406 return (error);
1407 }
1408
1409 static int
bridge_ioctl_rts(struct bridge_softc * sc,void * arg)1410 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1411 {
1412 struct ifbaconf *bac = arg;
1413 struct bridge_rtnode *brt;
1414 struct ifbareq bareq;
1415 char *buf, *outbuf;
1416 int count, buflen, len, error = 0;
1417
1418 if (bac->ifbac_len == 0)
1419 return (0);
1420
1421 count = 0;
1422 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1423 count++;
1424 buflen = sizeof(bareq) * count;
1425
1426 BRIDGE_UNLOCK(sc);
1427 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1428 BRIDGE_LOCK(sc);
1429
1430 count = 0;
1431 buf = outbuf;
1432 len = min(bac->ifbac_len, buflen);
1433 bzero(&bareq, sizeof(bareq));
1434 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1435 if (len < sizeof(bareq))
1436 goto out;
1437 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1438 sizeof(bareq.ifba_ifsname));
1439 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1440 bareq.ifba_vlan = brt->brt_vlan;
1441 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1442 time_uptime < brt->brt_expire)
1443 bareq.ifba_expire = brt->brt_expire - time_uptime;
1444 else
1445 bareq.ifba_expire = 0;
1446 bareq.ifba_flags = brt->brt_flags;
1447
1448 memcpy(buf, &bareq, sizeof(bareq));
1449 count++;
1450 buf += sizeof(bareq);
1451 len -= sizeof(bareq);
1452 }
1453 out:
1454 BRIDGE_UNLOCK(sc);
1455 bac->ifbac_len = sizeof(bareq) * count;
1456 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1457 BRIDGE_LOCK(sc);
1458 free(outbuf, M_TEMP);
1459 return (error);
1460 }
1461
1462 static int
bridge_ioctl_saddr(struct bridge_softc * sc,void * arg)1463 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1464 {
1465 struct ifbareq *req = arg;
1466 struct bridge_iflist *bif;
1467 int error;
1468
1469 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1470 if (bif == NULL)
1471 return (ENOENT);
1472
1473 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1474 req->ifba_flags);
1475
1476 return (error);
1477 }
1478
1479 static int
bridge_ioctl_sto(struct bridge_softc * sc,void * arg)1480 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1481 {
1482 struct ifbrparam *param = arg;
1483
1484 sc->sc_brttimeout = param->ifbrp_ctime;
1485 return (0);
1486 }
1487
1488 static int
bridge_ioctl_gto(struct bridge_softc * sc,void * arg)1489 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1490 {
1491 struct ifbrparam *param = arg;
1492
1493 param->ifbrp_ctime = sc->sc_brttimeout;
1494 return (0);
1495 }
1496
1497 static int
bridge_ioctl_daddr(struct bridge_softc * sc,void * arg)1498 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1499 {
1500 struct ifbareq *req = arg;
1501
1502 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1503 }
1504
1505 static int
bridge_ioctl_flush(struct bridge_softc * sc,void * arg)1506 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1507 {
1508 struct ifbreq *req = arg;
1509
1510 bridge_rtflush(sc, req->ifbr_ifsflags);
1511 return (0);
1512 }
1513
1514 static int
bridge_ioctl_gpri(struct bridge_softc * sc,void * arg)1515 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1516 {
1517 struct ifbrparam *param = arg;
1518 struct bstp_state *bs = &sc->sc_stp;
1519
1520 param->ifbrp_prio = bs->bs_bridge_priority;
1521 return (0);
1522 }
1523
1524 static int
bridge_ioctl_spri(struct bridge_softc * sc,void * arg)1525 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1526 {
1527 struct ifbrparam *param = arg;
1528
1529 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1530 }
1531
1532 static int
bridge_ioctl_ght(struct bridge_softc * sc,void * arg)1533 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1534 {
1535 struct ifbrparam *param = arg;
1536 struct bstp_state *bs = &sc->sc_stp;
1537
1538 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1539 return (0);
1540 }
1541
1542 static int
bridge_ioctl_sht(struct bridge_softc * sc,void * arg)1543 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1544 {
1545 struct ifbrparam *param = arg;
1546
1547 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1548 }
1549
1550 static int
bridge_ioctl_gfd(struct bridge_softc * sc,void * arg)1551 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1552 {
1553 struct ifbrparam *param = arg;
1554 struct bstp_state *bs = &sc->sc_stp;
1555
1556 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1557 return (0);
1558 }
1559
1560 static int
bridge_ioctl_sfd(struct bridge_softc * sc,void * arg)1561 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1562 {
1563 struct ifbrparam *param = arg;
1564
1565 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1566 }
1567
1568 static int
bridge_ioctl_gma(struct bridge_softc * sc,void * arg)1569 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1570 {
1571 struct ifbrparam *param = arg;
1572 struct bstp_state *bs = &sc->sc_stp;
1573
1574 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1575 return (0);
1576 }
1577
1578 static int
bridge_ioctl_sma(struct bridge_softc * sc,void * arg)1579 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1580 {
1581 struct ifbrparam *param = arg;
1582
1583 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1584 }
1585
1586 static int
bridge_ioctl_sifprio(struct bridge_softc * sc,void * arg)1587 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1588 {
1589 struct ifbreq *req = arg;
1590 struct bridge_iflist *bif;
1591
1592 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1593 if (bif == NULL)
1594 return (ENOENT);
1595
1596 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1597 }
1598
1599 static int
bridge_ioctl_sifcost(struct bridge_softc * sc,void * arg)1600 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1601 {
1602 struct ifbreq *req = arg;
1603 struct bridge_iflist *bif;
1604
1605 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1606 if (bif == NULL)
1607 return (ENOENT);
1608
1609 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1610 }
1611
1612 static int
bridge_ioctl_sifmaxaddr(struct bridge_softc * sc,void * arg)1613 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1614 {
1615 struct ifbreq *req = arg;
1616 struct bridge_iflist *bif;
1617
1618 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1619 if (bif == NULL)
1620 return (ENOENT);
1621
1622 bif->bif_addrmax = req->ifbr_addrmax;
1623 return (0);
1624 }
1625
1626 static int
bridge_ioctl_addspan(struct bridge_softc * sc,void * arg)1627 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1628 {
1629 struct ifbreq *req = arg;
1630 struct bridge_iflist *bif = NULL;
1631 struct ifnet *ifs;
1632
1633 ifs = ifunit(req->ifbr_ifsname);
1634 if (ifs == NULL)
1635 return (ENOENT);
1636
1637 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1638 if (ifs == bif->bif_ifp)
1639 return (EBUSY);
1640
1641 if (ifs->if_bridge != NULL)
1642 return (EBUSY);
1643
1644 switch (ifs->if_type) {
1645 case IFT_ETHER:
1646 case IFT_GIF:
1647 case IFT_L2VLAN:
1648 break;
1649 default:
1650 return (EINVAL);
1651 }
1652
1653 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1654 if (bif == NULL)
1655 return (ENOMEM);
1656
1657 bif->bif_ifp = ifs;
1658 bif->bif_flags = IFBIF_SPAN;
1659
1660 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1661
1662 return (0);
1663 }
1664
1665 static int
bridge_ioctl_delspan(struct bridge_softc * sc,void * arg)1666 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1667 {
1668 struct ifbreq *req = arg;
1669 struct bridge_iflist *bif;
1670 struct ifnet *ifs;
1671
1672 ifs = ifunit(req->ifbr_ifsname);
1673 if (ifs == NULL)
1674 return (ENOENT);
1675
1676 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1677 if (ifs == bif->bif_ifp)
1678 break;
1679
1680 if (bif == NULL)
1681 return (ENOENT);
1682
1683 bridge_delete_span(sc, bif);
1684
1685 return (0);
1686 }
1687
1688 static int
bridge_ioctl_gbparam(struct bridge_softc * sc,void * arg)1689 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1690 {
1691 struct ifbropreq *req = arg;
1692 struct bstp_state *bs = &sc->sc_stp;
1693 struct bstp_port *root_port;
1694
1695 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1696 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1697 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1698
1699 root_port = bs->bs_root_port;
1700 if (root_port == NULL)
1701 req->ifbop_root_port = 0;
1702 else
1703 req->ifbop_root_port = root_port->bp_ifp->if_index;
1704
1705 req->ifbop_holdcount = bs->bs_txholdcount;
1706 req->ifbop_priority = bs->bs_bridge_priority;
1707 req->ifbop_protocol = bs->bs_protover;
1708 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1709 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1710 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1711 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1712 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1713 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1714
1715 return (0);
1716 }
1717
1718 static int
bridge_ioctl_grte(struct bridge_softc * sc,void * arg)1719 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1720 {
1721 struct ifbrparam *param = arg;
1722
1723 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1724 return (0);
1725 }
1726
1727 static int
bridge_ioctl_gifsstp(struct bridge_softc * sc,void * arg)1728 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1729 {
1730 struct ifbpstpconf *bifstp = arg;
1731 struct bridge_iflist *bif;
1732 struct bstp_port *bp;
1733 struct ifbpstpreq bpreq;
1734 char *buf, *outbuf;
1735 int count, buflen, len, error = 0;
1736
1737 count = 0;
1738 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1739 if ((bif->bif_flags & IFBIF_STP) != 0)
1740 count++;
1741 }
1742
1743 buflen = sizeof(bpreq) * count;
1744 if (bifstp->ifbpstp_len == 0) {
1745 bifstp->ifbpstp_len = buflen;
1746 return (0);
1747 }
1748
1749 BRIDGE_UNLOCK(sc);
1750 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1751 BRIDGE_LOCK(sc);
1752
1753 count = 0;
1754 buf = outbuf;
1755 len = min(bifstp->ifbpstp_len, buflen);
1756 bzero(&bpreq, sizeof(bpreq));
1757 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1758 if (len < sizeof(bpreq))
1759 break;
1760
1761 if ((bif->bif_flags & IFBIF_STP) == 0)
1762 continue;
1763
1764 bp = &bif->bif_stp;
1765 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1766 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1767 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1768 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1769 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1770 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1771
1772 memcpy(buf, &bpreq, sizeof(bpreq));
1773 count++;
1774 buf += sizeof(bpreq);
1775 len -= sizeof(bpreq);
1776 }
1777
1778 BRIDGE_UNLOCK(sc);
1779 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1780 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1781 BRIDGE_LOCK(sc);
1782 free(outbuf, M_TEMP);
1783 return (error);
1784 }
1785
1786 static int
bridge_ioctl_sproto(struct bridge_softc * sc,void * arg)1787 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1788 {
1789 struct ifbrparam *param = arg;
1790
1791 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1792 }
1793
1794 static int
bridge_ioctl_stxhc(struct bridge_softc * sc,void * arg)1795 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1796 {
1797 struct ifbrparam *param = arg;
1798
1799 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1800 }
1801
1802 /*
1803 * bridge_ifdetach:
1804 *
1805 * Detach an interface from a bridge. Called when a member
1806 * interface is detaching.
1807 */
1808 static void
bridge_ifdetach(void * arg __unused,struct ifnet * ifp)1809 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1810 {
1811 struct bridge_softc *sc = ifp->if_bridge;
1812 struct bridge_iflist *bif;
1813
1814 if (ifp->if_flags & IFF_RENAMING)
1815 return;
1816 if (V_bridge_cloner == NULL) {
1817 /*
1818 * This detach handler can be called after
1819 * vnet_bridge_uninit(). Just return in that case.
1820 */
1821 return;
1822 }
1823 /* Check if the interface is a bridge member */
1824 if (sc != NULL) {
1825 BRIDGE_LOCK(sc);
1826
1827 bif = bridge_lookup_member_if(sc, ifp);
1828 if (bif != NULL)
1829 bridge_delete_member(sc, bif, 1);
1830
1831 BRIDGE_UNLOCK(sc);
1832 return;
1833 }
1834
1835 /* Check if the interface is a span port */
1836 BRIDGE_LIST_LOCK();
1837 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1838 BRIDGE_LOCK(sc);
1839 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1840 if (ifp == bif->bif_ifp) {
1841 bridge_delete_span(sc, bif);
1842 break;
1843 }
1844
1845 BRIDGE_UNLOCK(sc);
1846 }
1847 BRIDGE_LIST_UNLOCK();
1848 }
1849
1850 /*
1851 * bridge_init:
1852 *
1853 * Initialize a bridge interface.
1854 */
1855 static void
bridge_init(void * xsc)1856 bridge_init(void *xsc)
1857 {
1858 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1859 struct ifnet *ifp = sc->sc_ifp;
1860
1861 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1862 return;
1863
1864 BRIDGE_LOCK(sc);
1865 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1866 bridge_timer, sc);
1867
1868 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1869 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1870
1871 BRIDGE_UNLOCK(sc);
1872 }
1873
1874 /*
1875 * bridge_stop:
1876 *
1877 * Stop the bridge interface.
1878 */
1879 static void
bridge_stop(struct ifnet * ifp,int disable)1880 bridge_stop(struct ifnet *ifp, int disable)
1881 {
1882 struct bridge_softc *sc = ifp->if_softc;
1883
1884 BRIDGE_LOCK_ASSERT(sc);
1885
1886 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1887 return;
1888
1889 callout_stop(&sc->sc_brcallout);
1890 bstp_stop(&sc->sc_stp);
1891
1892 bridge_rtflush(sc, IFBF_FLUSHDYN);
1893
1894 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1895 }
1896
1897 /*
1898 * bridge_enqueue:
1899 *
1900 * Enqueue a packet on a bridge member interface.
1901 *
1902 */
1903 static int
bridge_enqueue(struct bridge_softc * sc,struct ifnet * dst_ifp,struct mbuf * m)1904 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1905 {
1906 int len, err = 0;
1907 short mflags;
1908 struct mbuf *m0;
1909
1910 /* We may be sending a fragment so traverse the mbuf */
1911 for (; m; m = m0) {
1912 m0 = m->m_nextpkt;
1913 m->m_nextpkt = NULL;
1914 len = m->m_pkthdr.len;
1915 mflags = m->m_flags;
1916
1917 /*
1918 * If underlying interface can not do VLAN tag insertion itself
1919 * then attach a packet tag that holds it.
1920 */
1921 if ((m->m_flags & M_VLANTAG) &&
1922 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1923 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1924 if (m == NULL) {
1925 if_printf(dst_ifp,
1926 "unable to prepend VLAN header\n");
1927 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1928 continue;
1929 }
1930 m->m_flags &= ~M_VLANTAG;
1931 }
1932
1933 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1934 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1935 m_freem(m0);
1936 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1937 break;
1938 }
1939
1940 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1941 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1942 if (mflags & M_MCAST)
1943 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1944 }
1945
1946 return (err);
1947 }
1948
1949 /*
1950 * bridge_dummynet:
1951 *
1952 * Receive a queued packet from dummynet and pass it on to the output
1953 * interface.
1954 *
1955 * The mbuf has the Ethernet header already attached.
1956 */
1957 static void
bridge_dummynet(struct mbuf * m,struct ifnet * ifp)1958 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1959 {
1960 struct bridge_softc *sc;
1961
1962 sc = ifp->if_bridge;
1963
1964 /*
1965 * The packet didnt originate from a member interface. This should only
1966 * ever happen if a member interface is removed while packets are
1967 * queued for it.
1968 */
1969 if (sc == NULL) {
1970 m_freem(m);
1971 return;
1972 }
1973
1974 if (PFIL_HOOKED(&V_inet_pfil_hook)
1975 #ifdef INET6
1976 || PFIL_HOOKED(&V_inet6_pfil_hook)
1977 #endif
1978 ) {
1979 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1980 return;
1981 if (m == NULL)
1982 return;
1983 }
1984
1985 bridge_enqueue(sc, ifp, m);
1986 }
1987
1988 /*
1989 * bridge_output:
1990 *
1991 * Send output from a bridge member interface. This
1992 * performs the bridging function for locally originated
1993 * packets.
1994 *
1995 * The mbuf has the Ethernet header already attached. We must
1996 * enqueue or free the mbuf before returning.
1997 */
1998 static int
bridge_output(struct ifnet * ifp,struct mbuf * m,struct sockaddr * sa,struct rtentry * rt)1999 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2000 struct rtentry *rt)
2001 {
2002 struct ether_header *eh;
2003 struct ifnet *dst_if;
2004 struct bridge_softc *sc;
2005 uint16_t vlan;
2006
2007 if (m->m_len < ETHER_HDR_LEN) {
2008 m = m_pullup(m, ETHER_HDR_LEN);
2009 if (m == NULL)
2010 return (0);
2011 }
2012
2013 eh = mtod(m, struct ether_header *);
2014 sc = ifp->if_bridge;
2015 vlan = VLANTAGOF(m);
2016
2017 BRIDGE_LOCK(sc);
2018
2019 /*
2020 * If bridge is down, but the original output interface is up,
2021 * go ahead and send out that interface. Otherwise, the packet
2022 * is dropped below.
2023 */
2024 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2025 dst_if = ifp;
2026 goto sendunicast;
2027 }
2028
2029 /*
2030 * If the packet is a multicast, or we don't know a better way to
2031 * get there, send to all interfaces.
2032 */
2033 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2034 dst_if = NULL;
2035 else
2036 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2037 if (dst_if == NULL) {
2038 struct bridge_iflist *bif;
2039 struct mbuf *mc;
2040 int error = 0, used = 0;
2041
2042 bridge_span(sc, m);
2043
2044 BRIDGE_LOCK2REF(sc, error);
2045 if (error) {
2046 m_freem(m);
2047 return (0);
2048 }
2049
2050 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2051 dst_if = bif->bif_ifp;
2052
2053 if (dst_if->if_type == IFT_GIF)
2054 continue;
2055 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2056 continue;
2057
2058 /*
2059 * If this is not the original output interface,
2060 * and the interface is participating in spanning
2061 * tree, make sure the port is in a state that
2062 * allows forwarding.
2063 */
2064 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2065 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2066 continue;
2067
2068 if (LIST_NEXT(bif, bif_next) == NULL) {
2069 used = 1;
2070 mc = m;
2071 } else {
2072 mc = m_copypacket(m, M_NOWAIT);
2073 if (mc == NULL) {
2074 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2075 continue;
2076 }
2077 }
2078
2079 bridge_enqueue(sc, dst_if, mc);
2080 }
2081 if (used == 0)
2082 m_freem(m);
2083 BRIDGE_UNREF(sc);
2084 return (0);
2085 }
2086
2087 sendunicast:
2088 /*
2089 * XXX Spanning tree consideration here?
2090 */
2091
2092 bridge_span(sc, m);
2093 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2094 m_freem(m);
2095 BRIDGE_UNLOCK(sc);
2096 return (0);
2097 }
2098
2099 BRIDGE_UNLOCK(sc);
2100 bridge_enqueue(sc, dst_if, m);
2101 return (0);
2102 }
2103
2104 /*
2105 * bridge_transmit:
2106 *
2107 * Do output on a bridge.
2108 *
2109 */
2110 static int
bridge_transmit(struct ifnet * ifp,struct mbuf * m)2111 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2112 {
2113 struct bridge_softc *sc;
2114 struct ether_header *eh;
2115 struct ifnet *dst_if;
2116 int error = 0;
2117
2118 sc = ifp->if_softc;
2119
2120 ETHER_BPF_MTAP(ifp, m);
2121
2122 eh = mtod(m, struct ether_header *);
2123
2124 BRIDGE_LOCK(sc);
2125 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2126 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2127 BRIDGE_UNLOCK(sc);
2128 error = bridge_enqueue(sc, dst_if, m);
2129 } else
2130 bridge_broadcast(sc, ifp, m, 0);
2131
2132 return (error);
2133 }
2134
2135 /*
2136 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2137 */
2138 static void
bridge_qflush(struct ifnet * ifp __unused)2139 bridge_qflush(struct ifnet *ifp __unused)
2140 {
2141 }
2142
2143 /*
2144 * bridge_forward:
2145 *
2146 * The forwarding function of the bridge.
2147 *
2148 * NOTE: Releases the lock on return.
2149 */
2150 static void
bridge_forward(struct bridge_softc * sc,struct bridge_iflist * sbif,struct mbuf * m)2151 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2152 struct mbuf *m)
2153 {
2154 struct bridge_iflist *dbif;
2155 struct ifnet *src_if, *dst_if, *ifp;
2156 struct ether_header *eh;
2157 uint16_t vlan;
2158 uint8_t *dst;
2159 int error;
2160
2161 src_if = m->m_pkthdr.rcvif;
2162 ifp = sc->sc_ifp;
2163
2164 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2165 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2166 vlan = VLANTAGOF(m);
2167
2168 if ((sbif->bif_flags & IFBIF_STP) &&
2169 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2170 goto drop;
2171
2172 eh = mtod(m, struct ether_header *);
2173 dst = eh->ether_dhost;
2174
2175 /* If the interface is learning, record the address. */
2176 if (sbif->bif_flags & IFBIF_LEARNING) {
2177 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2178 sbif, 0, IFBAF_DYNAMIC);
2179 /*
2180 * If the interface has addresses limits then deny any source
2181 * that is not in the cache.
2182 */
2183 if (error && sbif->bif_addrmax)
2184 goto drop;
2185 }
2186
2187 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2188 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2189 goto drop;
2190
2191 /*
2192 * At this point, the port either doesn't participate
2193 * in spanning tree or it is in the forwarding state.
2194 */
2195
2196 /*
2197 * If the packet is unicast, destined for someone on
2198 * "this" side of the bridge, drop it.
2199 */
2200 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2201 dst_if = bridge_rtlookup(sc, dst, vlan);
2202 if (src_if == dst_if)
2203 goto drop;
2204 } else {
2205 /*
2206 * Check if its a reserved multicast address, any address
2207 * listed in 802.1D section 7.12.6 may not be forwarded by the
2208 * bridge.
2209 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2210 */
2211 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2212 dst[2] == 0xc2 && dst[3] == 0x00 &&
2213 dst[4] == 0x00 && dst[5] <= 0x0f)
2214 goto drop;
2215
2216 /* ...forward it to all interfaces. */
2217 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2218 dst_if = NULL;
2219 }
2220
2221 /*
2222 * If we have a destination interface which is a member of our bridge,
2223 * OR this is a unicast packet, push it through the bpf(4) machinery.
2224 * For broadcast or multicast packets, don't bother because it will
2225 * be reinjected into ether_input. We do this before we pass the packets
2226 * through the pfil(9) framework, as it is possible that pfil(9) will
2227 * drop the packet, or possibly modify it, making it difficult to debug
2228 * firewall issues on the bridge.
2229 */
2230 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2231 ETHER_BPF_MTAP(ifp, m);
2232
2233 /* run the packet filter */
2234 if (PFIL_HOOKED(&V_inet_pfil_hook)
2235 #ifdef INET6
2236 || PFIL_HOOKED(&V_inet6_pfil_hook)
2237 #endif
2238 ) {
2239 BRIDGE_UNLOCK(sc);
2240 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2241 return;
2242 if (m == NULL)
2243 return;
2244 BRIDGE_LOCK(sc);
2245 }
2246
2247 if (dst_if == NULL) {
2248 bridge_broadcast(sc, src_if, m, 1);
2249 return;
2250 }
2251
2252 /*
2253 * At this point, we're dealing with a unicast frame
2254 * going to a different interface.
2255 */
2256 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2257 goto drop;
2258
2259 dbif = bridge_lookup_member_if(sc, dst_if);
2260 if (dbif == NULL)
2261 /* Not a member of the bridge (anymore?) */
2262 goto drop;
2263
2264 /* Private segments can not talk to each other */
2265 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2266 goto drop;
2267
2268 if ((dbif->bif_flags & IFBIF_STP) &&
2269 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2270 goto drop;
2271
2272 BRIDGE_UNLOCK(sc);
2273
2274 if (PFIL_HOOKED(&V_inet_pfil_hook)
2275 #ifdef INET6
2276 || PFIL_HOOKED(&V_inet6_pfil_hook)
2277 #endif
2278 ) {
2279 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2280 return;
2281 if (m == NULL)
2282 return;
2283 }
2284
2285 bridge_enqueue(sc, dst_if, m);
2286 return;
2287
2288 drop:
2289 BRIDGE_UNLOCK(sc);
2290 m_freem(m);
2291 }
2292
2293 /*
2294 * bridge_input:
2295 *
2296 * Receive input from a member interface. Queue the packet for
2297 * bridging if it is not for us.
2298 */
2299 static struct mbuf *
bridge_input(struct ifnet * ifp,struct mbuf * m)2300 bridge_input(struct ifnet *ifp, struct mbuf *m)
2301 {
2302 struct bridge_softc *sc = ifp->if_bridge;
2303 struct bridge_iflist *bif, *bif2;
2304 struct ifnet *bifp;
2305 struct ether_header *eh;
2306 struct mbuf *mc, *mc2;
2307 uint16_t vlan;
2308 int error;
2309
2310 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2311 return (m);
2312
2313 bifp = sc->sc_ifp;
2314 vlan = VLANTAGOF(m);
2315
2316 /*
2317 * Implement support for bridge monitoring. If this flag has been
2318 * set on this interface, discard the packet once we push it through
2319 * the bpf(4) machinery, but before we do, increment the byte and
2320 * packet counters associated with this interface.
2321 */
2322 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2323 m->m_pkthdr.rcvif = bifp;
2324 ETHER_BPF_MTAP(bifp, m);
2325 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2326 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2327 m_freem(m);
2328 return (NULL);
2329 }
2330 BRIDGE_LOCK(sc);
2331 bif = bridge_lookup_member_if(sc, ifp);
2332 if (bif == NULL) {
2333 BRIDGE_UNLOCK(sc);
2334 return (m);
2335 }
2336
2337 eh = mtod(m, struct ether_header *);
2338
2339 bridge_span(sc, m);
2340
2341 if (m->m_flags & (M_BCAST|M_MCAST)) {
2342 /* Tap off 802.1D packets; they do not get forwarded. */
2343 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2344 ETHER_ADDR_LEN) == 0) {
2345 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2346 BRIDGE_UNLOCK(sc);
2347 return (NULL);
2348 }
2349
2350 if ((bif->bif_flags & IFBIF_STP) &&
2351 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2352 BRIDGE_UNLOCK(sc);
2353 return (m);
2354 }
2355
2356 /*
2357 * Make a deep copy of the packet and enqueue the copy
2358 * for bridge processing; return the original packet for
2359 * local processing.
2360 */
2361 mc = m_dup(m, M_NOWAIT);
2362 if (mc == NULL) {
2363 BRIDGE_UNLOCK(sc);
2364 return (m);
2365 }
2366
2367 /* Perform the bridge forwarding function with the copy. */
2368 bridge_forward(sc, bif, mc);
2369
2370 /*
2371 * Reinject the mbuf as arriving on the bridge so we have a
2372 * chance at claiming multicast packets. We can not loop back
2373 * here from ether_input as a bridge is never a member of a
2374 * bridge.
2375 */
2376 KASSERT(bifp->if_bridge == NULL,
2377 ("loop created in bridge_input"));
2378 mc2 = m_dup(m, M_NOWAIT);
2379 if (mc2 != NULL) {
2380 /* Keep the layer3 header aligned */
2381 int i = min(mc2->m_pkthdr.len, max_protohdr);
2382 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2383 }
2384 if (mc2 != NULL) {
2385 mc2->m_pkthdr.rcvif = bifp;
2386 (*bifp->if_input)(bifp, mc2);
2387 }
2388
2389 /* Return the original packet for local processing. */
2390 return (m);
2391 }
2392
2393 if ((bif->bif_flags & IFBIF_STP) &&
2394 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2395 BRIDGE_UNLOCK(sc);
2396 return (m);
2397 }
2398
2399 #if (defined(INET) || defined(INET6))
2400 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2401 || ((iface)->if_carp \
2402 && (*carp_forus_p)((iface), eh->ether_dhost))
2403 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2404 || ((iface)->if_carp \
2405 && (*carp_forus_p)((iface), eh->ether_shost))
2406 #else
2407 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2408 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2409 #endif
2410
2411 #ifdef INET6
2412 # define OR_PFIL_HOOKED_INET6 \
2413 || PFIL_HOOKED(&V_inet6_pfil_hook)
2414 #else
2415 # define OR_PFIL_HOOKED_INET6
2416 #endif
2417
2418 #define GRAB_OUR_PACKETS(iface) \
2419 if ((iface)->if_type == IFT_GIF) \
2420 continue; \
2421 /* It is destined for us. */ \
2422 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2423 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2424 ) { \
2425 if ((iface)->if_type == IFT_BRIDGE) { \
2426 ETHER_BPF_MTAP(iface, m); \
2427 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \
2428 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2429 /* Filter on the physical interface. */ \
2430 if (V_pfil_local_phys && \
2431 (PFIL_HOOKED(&V_inet_pfil_hook) \
2432 OR_PFIL_HOOKED_INET6)) { \
2433 if (bridge_pfil(&m, NULL, ifp, \
2434 PFIL_IN) != 0 || m == NULL) { \
2435 BRIDGE_UNLOCK(sc); \
2436 return (NULL); \
2437 } \
2438 eh = mtod(m, struct ether_header *); \
2439 } \
2440 } \
2441 if (bif->bif_flags & IFBIF_LEARNING) { \
2442 error = bridge_rtupdate(sc, eh->ether_shost, \
2443 vlan, bif, 0, IFBAF_DYNAMIC); \
2444 if (error && bif->bif_addrmax) { \
2445 BRIDGE_UNLOCK(sc); \
2446 m_freem(m); \
2447 return (NULL); \
2448 } \
2449 } \
2450 m->m_pkthdr.rcvif = iface; \
2451 BRIDGE_UNLOCK(sc); \
2452 return (m); \
2453 } \
2454 \
2455 /* We just received a packet that we sent out. */ \
2456 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2457 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2458 ) { \
2459 BRIDGE_UNLOCK(sc); \
2460 m_freem(m); \
2461 return (NULL); \
2462 }
2463
2464 /*
2465 * Unicast. Make sure it's not for the bridge.
2466 */
2467 do { GRAB_OUR_PACKETS(bifp) } while (0);
2468
2469 /*
2470 * Give a chance for ifp at first priority. This will help when the
2471 * packet comes through the interface like VLAN's with the same MACs
2472 * on several interfaces from the same bridge. This also will save
2473 * some CPU cycles in case the destination interface and the input
2474 * interface (eq ifp) are the same.
2475 */
2476 do { GRAB_OUR_PACKETS(ifp) } while (0);
2477
2478 /* Now check the all bridge members. */
2479 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2480 GRAB_OUR_PACKETS(bif2->bif_ifp)
2481 }
2482
2483 #undef OR_CARP_CHECK_WE_ARE_DST
2484 #undef OR_CARP_CHECK_WE_ARE_SRC
2485 #undef OR_PFIL_HOOKED_INET6
2486 #undef GRAB_OUR_PACKETS
2487
2488 /* Perform the bridge forwarding function. */
2489 bridge_forward(sc, bif, m);
2490
2491 return (NULL);
2492 }
2493
2494 /*
2495 * bridge_broadcast:
2496 *
2497 * Send a frame to all interfaces that are members of
2498 * the bridge, except for the one on which the packet
2499 * arrived.
2500 *
2501 * NOTE: Releases the lock on return.
2502 */
2503 static void
bridge_broadcast(struct bridge_softc * sc,struct ifnet * src_if,struct mbuf * m,int runfilt)2504 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2505 struct mbuf *m, int runfilt)
2506 {
2507 struct bridge_iflist *dbif, *sbif;
2508 struct mbuf *mc;
2509 struct ifnet *dst_if;
2510 int error = 0, used = 0, i;
2511
2512 sbif = bridge_lookup_member_if(sc, src_if);
2513
2514 BRIDGE_LOCK2REF(sc, error);
2515 if (error) {
2516 m_freem(m);
2517 return;
2518 }
2519
2520 /* Filter on the bridge interface before broadcasting */
2521 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2522 #ifdef INET6
2523 || PFIL_HOOKED(&V_inet6_pfil_hook)
2524 #endif
2525 )) {
2526 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2527 goto out;
2528 if (m == NULL)
2529 goto out;
2530 }
2531
2532 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2533 dst_if = dbif->bif_ifp;
2534 if (dst_if == src_if)
2535 continue;
2536
2537 /* Private segments can not talk to each other */
2538 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2539 continue;
2540
2541 if ((dbif->bif_flags & IFBIF_STP) &&
2542 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2543 continue;
2544
2545 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2546 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2547 continue;
2548
2549 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2550 continue;
2551
2552 if (LIST_NEXT(dbif, bif_next) == NULL) {
2553 mc = m;
2554 used = 1;
2555 } else {
2556 mc = m_dup(m, M_NOWAIT);
2557 if (mc == NULL) {
2558 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2559 continue;
2560 }
2561 }
2562
2563 /*
2564 * Filter on the output interface. Pass a NULL bridge interface
2565 * pointer so we do not redundantly filter on the bridge for
2566 * each interface we broadcast on.
2567 */
2568 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2569 #ifdef INET6
2570 || PFIL_HOOKED(&V_inet6_pfil_hook)
2571 #endif
2572 )) {
2573 if (used == 0) {
2574 /* Keep the layer3 header aligned */
2575 i = min(mc->m_pkthdr.len, max_protohdr);
2576 mc = m_copyup(mc, i, ETHER_ALIGN);
2577 if (mc == NULL) {
2578 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2579 continue;
2580 }
2581 }
2582 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2583 continue;
2584 if (mc == NULL)
2585 continue;
2586 }
2587
2588 bridge_enqueue(sc, dst_if, mc);
2589 }
2590 if (used == 0)
2591 m_freem(m);
2592
2593 out:
2594 BRIDGE_UNREF(sc);
2595 }
2596
2597 /*
2598 * bridge_span:
2599 *
2600 * Duplicate a packet out one or more interfaces that are in span mode,
2601 * the original mbuf is unmodified.
2602 */
2603 static void
bridge_span(struct bridge_softc * sc,struct mbuf * m)2604 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2605 {
2606 struct bridge_iflist *bif;
2607 struct ifnet *dst_if;
2608 struct mbuf *mc;
2609
2610 if (LIST_EMPTY(&sc->sc_spanlist))
2611 return;
2612
2613 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2614 dst_if = bif->bif_ifp;
2615
2616 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2617 continue;
2618
2619 mc = m_copypacket(m, M_NOWAIT);
2620 if (mc == NULL) {
2621 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2622 continue;
2623 }
2624
2625 bridge_enqueue(sc, dst_if, mc);
2626 }
2627 }
2628
2629 /*
2630 * bridge_rtupdate:
2631 *
2632 * Add a bridge routing entry.
2633 */
2634 static int
bridge_rtupdate(struct bridge_softc * sc,const uint8_t * dst,uint16_t vlan,struct bridge_iflist * bif,int setflags,uint8_t flags)2635 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2636 struct bridge_iflist *bif, int setflags, uint8_t flags)
2637 {
2638 struct bridge_rtnode *brt;
2639 int error;
2640
2641 BRIDGE_LOCK_ASSERT(sc);
2642
2643 /* Check the source address is valid and not multicast. */
2644 if (ETHER_IS_MULTICAST(dst) ||
2645 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2646 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2647 return (EINVAL);
2648
2649 /* 802.1p frames map to vlan 1 */
2650 if (vlan == 0)
2651 vlan = 1;
2652
2653 /*
2654 * A route for this destination might already exist. If so,
2655 * update it, otherwise create a new one.
2656 */
2657 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2658 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2659 sc->sc_brtexceeded++;
2660 return (ENOSPC);
2661 }
2662 /* Check per interface address limits (if enabled) */
2663 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2664 bif->bif_addrexceeded++;
2665 return (ENOSPC);
2666 }
2667
2668 /*
2669 * Allocate a new bridge forwarding node, and
2670 * initialize the expiration time and Ethernet
2671 * address.
2672 */
2673 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2674 if (brt == NULL)
2675 return (ENOMEM);
2676
2677 if (bif->bif_flags & IFBIF_STICKY)
2678 brt->brt_flags = IFBAF_STICKY;
2679 else
2680 brt->brt_flags = IFBAF_DYNAMIC;
2681
2682 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2683 brt->brt_vlan = vlan;
2684
2685 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2686 uma_zfree(V_bridge_rtnode_zone, brt);
2687 return (error);
2688 }
2689 brt->brt_dst = bif;
2690 bif->bif_addrcnt++;
2691 }
2692
2693 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2694 brt->brt_dst != bif) {
2695 brt->brt_dst->bif_addrcnt--;
2696 brt->brt_dst = bif;
2697 brt->brt_dst->bif_addrcnt++;
2698 }
2699
2700 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2701 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2702 if (setflags)
2703 brt->brt_flags = flags;
2704
2705 return (0);
2706 }
2707
2708 /*
2709 * bridge_rtlookup:
2710 *
2711 * Lookup the destination interface for an address.
2712 */
2713 static struct ifnet *
bridge_rtlookup(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)2714 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2715 {
2716 struct bridge_rtnode *brt;
2717
2718 BRIDGE_LOCK_ASSERT(sc);
2719
2720 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2721 return (NULL);
2722
2723 return (brt->brt_ifp);
2724 }
2725
2726 /*
2727 * bridge_rttrim:
2728 *
2729 * Trim the routine table so that we have a number
2730 * of routing entries less than or equal to the
2731 * maximum number.
2732 */
2733 static void
bridge_rttrim(struct bridge_softc * sc)2734 bridge_rttrim(struct bridge_softc *sc)
2735 {
2736 struct bridge_rtnode *brt, *nbrt;
2737
2738 BRIDGE_LOCK_ASSERT(sc);
2739
2740 /* Make sure we actually need to do this. */
2741 if (sc->sc_brtcnt <= sc->sc_brtmax)
2742 return;
2743
2744 /* Force an aging cycle; this might trim enough addresses. */
2745 bridge_rtage(sc);
2746 if (sc->sc_brtcnt <= sc->sc_brtmax)
2747 return;
2748
2749 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2750 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2751 bridge_rtnode_destroy(sc, brt);
2752 if (sc->sc_brtcnt <= sc->sc_brtmax)
2753 return;
2754 }
2755 }
2756 }
2757
2758 /*
2759 * bridge_timer:
2760 *
2761 * Aging timer for the bridge.
2762 */
2763 static void
bridge_timer(void * arg)2764 bridge_timer(void *arg)
2765 {
2766 struct bridge_softc *sc = arg;
2767
2768 BRIDGE_LOCK_ASSERT(sc);
2769
2770 /* Destruction of rtnodes requires a proper vnet context */
2771 CURVNET_SET(sc->sc_ifp->if_vnet);
2772 bridge_rtage(sc);
2773
2774 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2775 callout_reset(&sc->sc_brcallout,
2776 bridge_rtable_prune_period * hz, bridge_timer, sc);
2777 CURVNET_RESTORE();
2778 }
2779
2780 /*
2781 * bridge_rtage:
2782 *
2783 * Perform an aging cycle.
2784 */
2785 static void
bridge_rtage(struct bridge_softc * sc)2786 bridge_rtage(struct bridge_softc *sc)
2787 {
2788 struct bridge_rtnode *brt, *nbrt;
2789
2790 BRIDGE_LOCK_ASSERT(sc);
2791
2792 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2793 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2794 if (time_uptime >= brt->brt_expire)
2795 bridge_rtnode_destroy(sc, brt);
2796 }
2797 }
2798 }
2799
2800 /*
2801 * bridge_rtflush:
2802 *
2803 * Remove all dynamic addresses from the bridge.
2804 */
2805 static void
bridge_rtflush(struct bridge_softc * sc,int full)2806 bridge_rtflush(struct bridge_softc *sc, int full)
2807 {
2808 struct bridge_rtnode *brt, *nbrt;
2809
2810 BRIDGE_LOCK_ASSERT(sc);
2811
2812 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2813 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2814 bridge_rtnode_destroy(sc, brt);
2815 }
2816 }
2817
2818 /*
2819 * bridge_rtdaddr:
2820 *
2821 * Remove an address from the table.
2822 */
2823 static int
bridge_rtdaddr(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)2824 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2825 {
2826 struct bridge_rtnode *brt;
2827 int found = 0;
2828
2829 BRIDGE_LOCK_ASSERT(sc);
2830
2831 /*
2832 * If vlan is zero then we want to delete for all vlans so the lookup
2833 * may return more than one.
2834 */
2835 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2836 bridge_rtnode_destroy(sc, brt);
2837 found = 1;
2838 }
2839
2840 return (found ? 0 : ENOENT);
2841 }
2842
2843 /*
2844 * bridge_rtdelete:
2845 *
2846 * Delete routes to a speicifc member interface.
2847 */
2848 static void
bridge_rtdelete(struct bridge_softc * sc,struct ifnet * ifp,int full)2849 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2850 {
2851 struct bridge_rtnode *brt, *nbrt;
2852
2853 BRIDGE_LOCK_ASSERT(sc);
2854
2855 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2856 if (brt->brt_ifp == ifp && (full ||
2857 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2858 bridge_rtnode_destroy(sc, brt);
2859 }
2860 }
2861
2862 /*
2863 * bridge_rtable_init:
2864 *
2865 * Initialize the route table for this bridge.
2866 */
2867 static void
bridge_rtable_init(struct bridge_softc * sc)2868 bridge_rtable_init(struct bridge_softc *sc)
2869 {
2870 int i;
2871
2872 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2873 M_DEVBUF, M_WAITOK);
2874
2875 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2876 LIST_INIT(&sc->sc_rthash[i]);
2877
2878 sc->sc_rthash_key = arc4random();
2879 LIST_INIT(&sc->sc_rtlist);
2880 }
2881
2882 /*
2883 * bridge_rtable_fini:
2884 *
2885 * Deconstruct the route table for this bridge.
2886 */
2887 static void
bridge_rtable_fini(struct bridge_softc * sc)2888 bridge_rtable_fini(struct bridge_softc *sc)
2889 {
2890
2891 KASSERT(sc->sc_brtcnt == 0,
2892 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2893 free(sc->sc_rthash, M_DEVBUF);
2894 }
2895
2896 /*
2897 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2898 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2899 */
2900 #define mix(a, b, c) \
2901 do { \
2902 a -= b; a -= c; a ^= (c >> 13); \
2903 b -= c; b -= a; b ^= (a << 8); \
2904 c -= a; c -= b; c ^= (b >> 13); \
2905 a -= b; a -= c; a ^= (c >> 12); \
2906 b -= c; b -= a; b ^= (a << 16); \
2907 c -= a; c -= b; c ^= (b >> 5); \
2908 a -= b; a -= c; a ^= (c >> 3); \
2909 b -= c; b -= a; b ^= (a << 10); \
2910 c -= a; c -= b; c ^= (b >> 15); \
2911 } while (/*CONSTCOND*/0)
2912
2913 static __inline uint32_t
bridge_rthash(struct bridge_softc * sc,const uint8_t * addr)2914 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2915 {
2916 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2917
2918 b += addr[5] << 8;
2919 b += addr[4];
2920 a += addr[3] << 24;
2921 a += addr[2] << 16;
2922 a += addr[1] << 8;
2923 a += addr[0];
2924
2925 mix(a, b, c);
2926
2927 return (c & BRIDGE_RTHASH_MASK);
2928 }
2929
2930 #undef mix
2931
2932 static int
bridge_rtnode_addr_cmp(const uint8_t * a,const uint8_t * b)2933 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2934 {
2935 int i, d;
2936
2937 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2938 d = ((int)a[i]) - ((int)b[i]);
2939 }
2940
2941 return (d);
2942 }
2943
2944 /*
2945 * bridge_rtnode_lookup:
2946 *
2947 * Look up a bridge route node for the specified destination. Compare the
2948 * vlan id or if zero then just return the first match.
2949 */
2950 static struct bridge_rtnode *
bridge_rtnode_lookup(struct bridge_softc * sc,const uint8_t * addr,uint16_t vlan)2951 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2952 {
2953 struct bridge_rtnode *brt;
2954 uint32_t hash;
2955 int dir;
2956
2957 BRIDGE_LOCK_ASSERT(sc);
2958
2959 hash = bridge_rthash(sc, addr);
2960 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2961 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2962 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2963 return (brt);
2964 if (dir > 0)
2965 return (NULL);
2966 }
2967
2968 return (NULL);
2969 }
2970
2971 /*
2972 * bridge_rtnode_insert:
2973 *
2974 * Insert the specified bridge node into the route table. We
2975 * assume the entry is not already in the table.
2976 */
2977 static int
bridge_rtnode_insert(struct bridge_softc * sc,struct bridge_rtnode * brt)2978 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2979 {
2980 struct bridge_rtnode *lbrt;
2981 uint32_t hash;
2982 int dir;
2983
2984 BRIDGE_LOCK_ASSERT(sc);
2985
2986 hash = bridge_rthash(sc, brt->brt_addr);
2987
2988 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2989 if (lbrt == NULL) {
2990 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2991 goto out;
2992 }
2993
2994 do {
2995 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2996 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2997 return (EEXIST);
2998 if (dir > 0) {
2999 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3000 goto out;
3001 }
3002 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
3003 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3004 goto out;
3005 }
3006 lbrt = LIST_NEXT(lbrt, brt_hash);
3007 } while (lbrt != NULL);
3008
3009 #ifdef DIAGNOSTIC
3010 panic("bridge_rtnode_insert: impossible");
3011 #endif
3012
3013 out:
3014 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3015 sc->sc_brtcnt++;
3016
3017 return (0);
3018 }
3019
3020 /*
3021 * bridge_rtnode_destroy:
3022 *
3023 * Destroy a bridge rtnode.
3024 */
3025 static void
bridge_rtnode_destroy(struct bridge_softc * sc,struct bridge_rtnode * brt)3026 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3027 {
3028 BRIDGE_LOCK_ASSERT(sc);
3029
3030 LIST_REMOVE(brt, brt_hash);
3031
3032 LIST_REMOVE(brt, brt_list);
3033 sc->sc_brtcnt--;
3034 brt->brt_dst->bif_addrcnt--;
3035 uma_zfree(V_bridge_rtnode_zone, brt);
3036 }
3037
3038 /*
3039 * bridge_rtable_expire:
3040 *
3041 * Set the expiry time for all routes on an interface.
3042 */
3043 static void
bridge_rtable_expire(struct ifnet * ifp,int age)3044 bridge_rtable_expire(struct ifnet *ifp, int age)
3045 {
3046 struct bridge_softc *sc = ifp->if_bridge;
3047 struct bridge_rtnode *brt;
3048
3049 CURVNET_SET(ifp->if_vnet);
3050 BRIDGE_LOCK(sc);
3051
3052 /*
3053 * If the age is zero then flush, otherwise set all the expiry times to
3054 * age for the interface
3055 */
3056 if (age == 0)
3057 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3058 else {
3059 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3060 /* Cap the expiry time to 'age' */
3061 if (brt->brt_ifp == ifp &&
3062 brt->brt_expire > time_uptime + age &&
3063 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3064 brt->brt_expire = time_uptime + age;
3065 }
3066 }
3067 BRIDGE_UNLOCK(sc);
3068 CURVNET_RESTORE();
3069 }
3070
3071 /*
3072 * bridge_state_change:
3073 *
3074 * Callback from the bridgestp code when a port changes states.
3075 */
3076 static void
bridge_state_change(struct ifnet * ifp,int state)3077 bridge_state_change(struct ifnet *ifp, int state)
3078 {
3079 struct bridge_softc *sc = ifp->if_bridge;
3080 static const char *stpstates[] = {
3081 "disabled",
3082 "listening",
3083 "learning",
3084 "forwarding",
3085 "blocking",
3086 "discarding"
3087 };
3088
3089 CURVNET_SET(ifp->if_vnet);
3090 if (V_log_stp)
3091 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3092 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3093 CURVNET_RESTORE();
3094 }
3095
3096 /*
3097 * Send bridge packets through pfil if they are one of the types pfil can deal
3098 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3099 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3100 * that interface.
3101 */
3102 static int
bridge_pfil(struct mbuf ** mp,struct ifnet * bifp,struct ifnet * ifp,int dir)3103 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3104 {
3105 int snap, error, i, hlen;
3106 struct ether_header *eh1, eh2;
3107 struct ip *ip;
3108 struct llc llc1;
3109 u_int16_t ether_type;
3110
3111 snap = 0;
3112 error = -1; /* Default error if not error == 0 */
3113
3114 #if 0
3115 /* we may return with the IP fields swapped, ensure its not shared */
3116 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3117 #endif
3118
3119 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3120 return (0); /* filtering is disabled */
3121
3122 i = min((*mp)->m_pkthdr.len, max_protohdr);
3123 if ((*mp)->m_len < i) {
3124 *mp = m_pullup(*mp, i);
3125 if (*mp == NULL) {
3126 printf("%s: m_pullup failed\n", __func__);
3127 return (-1);
3128 }
3129 }
3130
3131 eh1 = mtod(*mp, struct ether_header *);
3132 ether_type = ntohs(eh1->ether_type);
3133
3134 /*
3135 * Check for SNAP/LLC.
3136 */
3137 if (ether_type < ETHERMTU) {
3138 struct llc *llc2 = (struct llc *)(eh1 + 1);
3139
3140 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3141 llc2->llc_dsap == LLC_SNAP_LSAP &&
3142 llc2->llc_ssap == LLC_SNAP_LSAP &&
3143 llc2->llc_control == LLC_UI) {
3144 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3145 snap = 1;
3146 }
3147 }
3148
3149 /*
3150 * If we're trying to filter bridge traffic, don't look at anything
3151 * other than IP and ARP traffic. If the filter doesn't understand
3152 * IPv6, don't allow IPv6 through the bridge either. This is lame
3153 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3154 * but of course we don't have an AppleTalk filter to begin with.
3155 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3156 * ARP traffic.)
3157 */
3158 switch (ether_type) {
3159 case ETHERTYPE_ARP:
3160 case ETHERTYPE_REVARP:
3161 if (V_pfil_ipfw_arp == 0)
3162 return (0); /* Automatically pass */
3163 break;
3164
3165 case ETHERTYPE_IP:
3166 #ifdef INET6
3167 case ETHERTYPE_IPV6:
3168 #endif /* INET6 */
3169 break;
3170 default:
3171 /*
3172 * Check to see if the user wants to pass non-ip
3173 * packets, these will not be checked by pfil(9) and
3174 * passed unconditionally so the default is to drop.
3175 */
3176 if (V_pfil_onlyip)
3177 goto bad;
3178 }
3179
3180 /* Run the packet through pfil before stripping link headers */
3181 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
3182 dir == PFIL_OUT && ifp != NULL) {
3183
3184 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, 0,
3185 NULL);
3186
3187 if (*mp == NULL || error != 0) /* packet consumed by filter */
3188 return (error);
3189 }
3190
3191 /* Strip off the Ethernet header and keep a copy. */
3192 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3193 m_adj(*mp, ETHER_HDR_LEN);
3194
3195 /* Strip off snap header, if present */
3196 if (snap) {
3197 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3198 m_adj(*mp, sizeof(struct llc));
3199 }
3200
3201 /*
3202 * Check the IP header for alignment and errors
3203 */
3204 if (dir == PFIL_IN) {
3205 switch (ether_type) {
3206 case ETHERTYPE_IP:
3207 error = bridge_ip_checkbasic(mp);
3208 break;
3209 #ifdef INET6
3210 case ETHERTYPE_IPV6:
3211 error = bridge_ip6_checkbasic(mp);
3212 break;
3213 #endif /* INET6 */
3214 default:
3215 error = 0;
3216 }
3217 if (error)
3218 goto bad;
3219 }
3220
3221 error = 0;
3222
3223 /*
3224 * Run the packet through pfil
3225 */
3226 switch (ether_type) {
3227 case ETHERTYPE_IP:
3228 /*
3229 * Run pfil on the member interface and the bridge, both can
3230 * be skipped by clearing pfil_member or pfil_bridge.
3231 *
3232 * Keep the order:
3233 * in_if -> bridge_if -> out_if
3234 */
3235 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3236 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3237 dir, 0, NULL);
3238
3239 if (*mp == NULL || error != 0) /* filter may consume */
3240 break;
3241
3242 if (V_pfil_member && ifp != NULL)
3243 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3244 dir, 0, NULL);
3245
3246 if (*mp == NULL || error != 0) /* filter may consume */
3247 break;
3248
3249 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3250 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3251 dir, 0, NULL);
3252
3253 if (*mp == NULL || error != 0) /* filter may consume */
3254 break;
3255
3256 /* check if we need to fragment the packet */
3257 /* bridge_fragment generates a mbuf chain of packets */
3258 /* that already include eth headers */
3259 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3260 i = (*mp)->m_pkthdr.len;
3261 if (i > ifp->if_mtu) {
3262 error = bridge_fragment(ifp, mp, &eh2, snap,
3263 &llc1);
3264 return (error);
3265 }
3266 }
3267
3268 /* Recalculate the ip checksum. */
3269 ip = mtod(*mp, struct ip *);
3270 hlen = ip->ip_hl << 2;
3271 if (hlen < sizeof(struct ip))
3272 goto bad;
3273 if (hlen > (*mp)->m_len) {
3274 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3275 goto bad;
3276 ip = mtod(*mp, struct ip *);
3277 if (ip == NULL)
3278 goto bad;
3279 }
3280 ip->ip_sum = 0;
3281 if (hlen == sizeof(struct ip))
3282 ip->ip_sum = in_cksum_hdr(ip);
3283 else
3284 ip->ip_sum = in_cksum(*mp, hlen);
3285
3286 break;
3287 #ifdef INET6
3288 case ETHERTYPE_IPV6:
3289 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3290 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3291 dir, 0, NULL);
3292
3293 if (*mp == NULL || error != 0) /* filter may consume */
3294 break;
3295
3296 if (V_pfil_member && ifp != NULL)
3297 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3298 dir, 0, NULL);
3299
3300 if (*mp == NULL || error != 0) /* filter may consume */
3301 break;
3302
3303 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3304 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3305 dir, 0, NULL);
3306 break;
3307 #endif
3308 default:
3309 error = 0;
3310 break;
3311 }
3312
3313 if (*mp == NULL)
3314 return (error);
3315 if (error != 0)
3316 goto bad;
3317
3318 error = -1;
3319
3320 /*
3321 * Finally, put everything back the way it was and return
3322 */
3323 if (snap) {
3324 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3325 if (*mp == NULL)
3326 return (error);
3327 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3328 }
3329
3330 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3331 if (*mp == NULL)
3332 return (error);
3333 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3334
3335 return (0);
3336
3337 bad:
3338 m_freem(*mp);
3339 *mp = NULL;
3340 return (error);
3341 }
3342
3343 /*
3344 * Perform basic checks on header size since
3345 * pfil assumes ip_input has already processed
3346 * it for it. Cut-and-pasted from ip_input.c.
3347 * Given how simple the IPv6 version is,
3348 * does the IPv4 version really need to be
3349 * this complicated?
3350 *
3351 * XXX Should we update ipstat here, or not?
3352 * XXX Right now we update ipstat but not
3353 * XXX csum_counter.
3354 */
3355 static int
bridge_ip_checkbasic(struct mbuf ** mp)3356 bridge_ip_checkbasic(struct mbuf **mp)
3357 {
3358 struct mbuf *m = *mp;
3359 struct ip *ip;
3360 int len, hlen;
3361 u_short sum;
3362
3363 if (*mp == NULL)
3364 return (-1);
3365
3366 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3367 if ((m = m_copyup(m, sizeof(struct ip),
3368 (max_linkhdr + 3) & ~3)) == NULL) {
3369 /* XXXJRT new stat, please */
3370 KMOD_IPSTAT_INC(ips_toosmall);
3371 goto bad;
3372 }
3373 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3374 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3375 KMOD_IPSTAT_INC(ips_toosmall);
3376 goto bad;
3377 }
3378 }
3379 ip = mtod(m, struct ip *);
3380 if (ip == NULL) goto bad;
3381
3382 if (ip->ip_v != IPVERSION) {
3383 KMOD_IPSTAT_INC(ips_badvers);
3384 goto bad;
3385 }
3386 hlen = ip->ip_hl << 2;
3387 if (hlen < sizeof(struct ip)) { /* minimum header length */
3388 KMOD_IPSTAT_INC(ips_badhlen);
3389 goto bad;
3390 }
3391 if (hlen > m->m_len) {
3392 if ((m = m_pullup(m, hlen)) == NULL) {
3393 KMOD_IPSTAT_INC(ips_badhlen);
3394 goto bad;
3395 }
3396 ip = mtod(m, struct ip *);
3397 if (ip == NULL) goto bad;
3398 }
3399
3400 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3401 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3402 } else {
3403 if (hlen == sizeof(struct ip)) {
3404 sum = in_cksum_hdr(ip);
3405 } else {
3406 sum = in_cksum(m, hlen);
3407 }
3408 }
3409 if (sum) {
3410 KMOD_IPSTAT_INC(ips_badsum);
3411 goto bad;
3412 }
3413
3414 /* Retrieve the packet length. */
3415 len = ntohs(ip->ip_len);
3416
3417 /*
3418 * Check for additional length bogosity
3419 */
3420 if (len < hlen) {
3421 KMOD_IPSTAT_INC(ips_badlen);
3422 goto bad;
3423 }
3424
3425 /*
3426 * Check that the amount of data in the buffers
3427 * is as at least much as the IP header would have us expect.
3428 * Drop packet if shorter than we expect.
3429 */
3430 if (m->m_pkthdr.len < len) {
3431 KMOD_IPSTAT_INC(ips_tooshort);
3432 goto bad;
3433 }
3434
3435 /* Checks out, proceed */
3436 *mp = m;
3437 return (0);
3438
3439 bad:
3440 *mp = m;
3441 return (-1);
3442 }
3443
3444 #ifdef INET6
3445 /*
3446 * Same as above, but for IPv6.
3447 * Cut-and-pasted from ip6_input.c.
3448 * XXX Should we update ip6stat, or not?
3449 */
3450 static int
bridge_ip6_checkbasic(struct mbuf ** mp)3451 bridge_ip6_checkbasic(struct mbuf **mp)
3452 {
3453 struct mbuf *m = *mp;
3454 struct ip6_hdr *ip6;
3455
3456 /*
3457 * If the IPv6 header is not aligned, slurp it up into a new
3458 * mbuf with space for link headers, in the event we forward
3459 * it. Otherwise, if it is aligned, make sure the entire base
3460 * IPv6 header is in the first mbuf of the chain.
3461 */
3462 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3463 struct ifnet *inifp = m->m_pkthdr.rcvif;
3464 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3465 (max_linkhdr + 3) & ~3)) == NULL) {
3466 /* XXXJRT new stat, please */
3467 IP6STAT_INC(ip6s_toosmall);
3468 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3469 goto bad;
3470 }
3471 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3472 struct ifnet *inifp = m->m_pkthdr.rcvif;
3473 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3474 IP6STAT_INC(ip6s_toosmall);
3475 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3476 goto bad;
3477 }
3478 }
3479
3480 ip6 = mtod(m, struct ip6_hdr *);
3481
3482 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3483 IP6STAT_INC(ip6s_badvers);
3484 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3485 goto bad;
3486 }
3487
3488 /* Checks out, proceed */
3489 *mp = m;
3490 return (0);
3491
3492 bad:
3493 *mp = m;
3494 return (-1);
3495 }
3496 #endif /* INET6 */
3497
3498 /*
3499 * bridge_fragment:
3500 *
3501 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3502 */
3503 static int
bridge_fragment(struct ifnet * ifp,struct mbuf ** mp,struct ether_header * eh,int snap,struct llc * llc)3504 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3505 int snap, struct llc *llc)
3506 {
3507 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3508 struct ip *ip;
3509 int error = -1;
3510
3511 if (m->m_len < sizeof(struct ip) &&
3512 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3513 goto dropit;
3514 ip = mtod(m, struct ip *);
3515
3516 m->m_pkthdr.csum_flags |= CSUM_IP;
3517 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3518 if (error)
3519 goto dropit;
3520
3521 /*
3522 * Walk the chain and re-add the Ethernet header for
3523 * each mbuf packet.
3524 */
3525 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3526 nextpkt = mcur->m_nextpkt;
3527 mcur->m_nextpkt = NULL;
3528 if (snap) {
3529 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3530 if (mcur == NULL) {
3531 error = ENOBUFS;
3532 if (mprev != NULL)
3533 mprev->m_nextpkt = nextpkt;
3534 goto dropit;
3535 }
3536 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3537 }
3538
3539 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3540 if (mcur == NULL) {
3541 error = ENOBUFS;
3542 if (mprev != NULL)
3543 mprev->m_nextpkt = nextpkt;
3544 goto dropit;
3545 }
3546 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3547
3548 /*
3549 * The previous two M_PREPEND could have inserted one or two
3550 * mbufs in front so we have to update the previous packet's
3551 * m_nextpkt.
3552 */
3553 mcur->m_nextpkt = nextpkt;
3554 if (mprev != NULL)
3555 mprev->m_nextpkt = mcur;
3556 else {
3557 /* The first mbuf in the original chain needs to be
3558 * updated. */
3559 *mp = mcur;
3560 }
3561 mprev = mcur;
3562 }
3563
3564 KMOD_IPSTAT_INC(ips_fragmented);
3565 return (error);
3566
3567 dropit:
3568 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3569 m = mcur->m_nextpkt;
3570 m_freem(mcur);
3571 }
3572 return (error);
3573 }
3574
3575 static void
bridge_linkstate(struct ifnet * ifp)3576 bridge_linkstate(struct ifnet *ifp)
3577 {
3578 struct bridge_softc *sc = ifp->if_bridge;
3579 struct bridge_iflist *bif;
3580
3581 BRIDGE_LOCK(sc);
3582 bif = bridge_lookup_member_if(sc, ifp);
3583 if (bif == NULL) {
3584 BRIDGE_UNLOCK(sc);
3585 return;
3586 }
3587 bridge_linkcheck(sc);
3588 BRIDGE_UNLOCK(sc);
3589
3590 bstp_linkstate(&bif->bif_stp);
3591 }
3592
3593 static void
bridge_linkcheck(struct bridge_softc * sc)3594 bridge_linkcheck(struct bridge_softc *sc)
3595 {
3596 struct bridge_iflist *bif;
3597 int new_link, hasls;
3598
3599 BRIDGE_LOCK_ASSERT(sc);
3600 new_link = LINK_STATE_DOWN;
3601 hasls = 0;
3602 /* Our link is considered up if at least one of our ports is active */
3603 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3604 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3605 hasls++;
3606 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3607 new_link = LINK_STATE_UP;
3608 break;
3609 }
3610 }
3611 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3612 /* If no interfaces support link-state then we default to up */
3613 new_link = LINK_STATE_UP;
3614 }
3615 if_link_state_change(sc->sc_ifp, new_link);
3616 }
3617