FreeBSD/Linux Kernel Cross Reference
sys/net/if_bridge.c
1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*
4 * Copyright 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
40 * All rights reserved.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
61 * POSSIBILITY OF SUCH DAMAGE.
62 *
63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
64 */
65
66 /*
67 * Network interface bridge support.
68 *
69 * TODO:
70 *
71 * - Currently only supports Ethernet-like interfaces (Ethernet,
72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
73 * to bridge other types of interfaces (FDDI-FDDI, and maybe
74 * consider heterogenous bridges).
75 */
76
77 #include <sys/cdefs.h>
78 __FBSDID("$FreeBSD: releng/10.1/sys/net/if_bridge.c 253751 2013-07-28 19:49:39Z hrs $");
79
80 #include "opt_inet.h"
81 #include "opt_inet6.h"
82
83 #include <sys/param.h>
84 #include <sys/mbuf.h>
85 #include <sys/malloc.h>
86 #include <sys/protosw.h>
87 #include <sys/systm.h>
88 #include <sys/jail.h>
89 #include <sys/time.h>
90 #include <sys/socket.h> /* for net/if.h */
91 #include <sys/sockio.h>
92 #include <sys/ctype.h> /* string functions */
93 #include <sys/kernel.h>
94 #include <sys/random.h>
95 #include <sys/syslog.h>
96 #include <sys/sysctl.h>
97 #include <vm/uma.h>
98 #include <sys/module.h>
99 #include <sys/priv.h>
100 #include <sys/proc.h>
101 #include <sys/lock.h>
102 #include <sys/mutex.h>
103
104 #include <net/bpf.h>
105 #include <net/if.h>
106 #include <net/if_clone.h>
107 #include <net/if_dl.h>
108 #include <net/if_types.h>
109 #include <net/if_var.h>
110 #include <net/pfil.h>
111 #include <net/vnet.h>
112
113 #include <netinet/in.h> /* for struct arpcom */
114 #include <netinet/in_systm.h>
115 #include <netinet/in_var.h>
116 #include <netinet/ip.h>
117 #include <netinet/ip_var.h>
118 #ifdef INET6
119 #include <netinet/ip6.h>
120 #include <netinet6/ip6_var.h>
121 #include <netinet6/in6_ifattach.h>
122 #endif
123 #if defined(INET) || defined(INET6)
124 #include <netinet/ip_carp.h>
125 #endif
126 #include <machine/in_cksum.h>
127 #include <netinet/if_ether.h> /* for struct arpcom */
128 #include <net/bridgestp.h>
129 #include <net/if_bridgevar.h>
130 #include <net/if_llc.h>
131 #include <net/if_vlan_var.h>
132
133 #include <net/route.h>
134
135 /*
136 * Size of the route hash table. Must be a power of two.
137 */
138 #ifndef BRIDGE_RTHASH_SIZE
139 #define BRIDGE_RTHASH_SIZE 1024
140 #endif
141
142 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
143
144 /*
145 * Default maximum number of addresses to cache.
146 */
147 #ifndef BRIDGE_RTABLE_MAX
148 #define BRIDGE_RTABLE_MAX 2000
149 #endif
150
151 /*
152 * Timeout (in seconds) for entries learned dynamically.
153 */
154 #ifndef BRIDGE_RTABLE_TIMEOUT
155 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
156 #endif
157
158 /*
159 * Number of seconds between walks of the route list.
160 */
161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
162 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
163 #endif
164
165 /*
166 * List of capabilities to possibly mask on the member interface.
167 */
168 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
169
170 /*
171 * List of capabilities to strip
172 */
173 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
174
175 /*
176 * Bridge interface list entry.
177 */
178 struct bridge_iflist {
179 LIST_ENTRY(bridge_iflist) bif_next;
180 struct ifnet *bif_ifp; /* member if */
181 struct bstp_port bif_stp; /* STP state */
182 uint32_t bif_flags; /* member if flags */
183 int bif_savedcaps; /* saved capabilities */
184 uint32_t bif_addrmax; /* max # of addresses */
185 uint32_t bif_addrcnt; /* cur. # of addresses */
186 uint32_t bif_addrexceeded;/* # of address violations */
187 };
188
189 /*
190 * Bridge route node.
191 */
192 struct bridge_rtnode {
193 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
194 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
195 struct bridge_iflist *brt_dst; /* destination if */
196 unsigned long brt_expire; /* expiration time */
197 uint8_t brt_flags; /* address flags */
198 uint8_t brt_addr[ETHER_ADDR_LEN];
199 uint16_t brt_vlan; /* vlan id */
200 };
201 #define brt_ifp brt_dst->bif_ifp
202
203 /*
204 * Software state for each bridge.
205 */
206 struct bridge_softc {
207 struct ifnet *sc_ifp; /* make this an interface */
208 LIST_ENTRY(bridge_softc) sc_list;
209 struct mtx sc_mtx;
210 struct cv sc_cv;
211 uint32_t sc_brtmax; /* max # of addresses */
212 uint32_t sc_brtcnt; /* cur. # of addresses */
213 uint32_t sc_brttimeout; /* rt timeout in seconds */
214 struct callout sc_brcallout; /* bridge callout */
215 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
216 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
217 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
218 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
219 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
220 uint32_t sc_rthash_key; /* key for hash */
221 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
222 struct bstp_state sc_stp; /* STP state */
223 uint32_t sc_brtexceeded; /* # of cache drops */
224 struct ifnet *sc_ifaddr; /* member mac copied from */
225 u_char sc_defaddr[6]; /* Default MAC address */
226 };
227
228 static struct mtx bridge_list_mtx;
229 eventhandler_tag bridge_detach_cookie = NULL;
230
231 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
232
233 uma_zone_t bridge_rtnode_zone;
234
235 static int bridge_clone_create(struct if_clone *, int, caddr_t);
236 static void bridge_clone_destroy(struct ifnet *);
237
238 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
239 static void bridge_mutecaps(struct bridge_softc *);
240 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
241 int);
242 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
243 static void bridge_init(void *);
244 static void bridge_dummynet(struct mbuf *, struct ifnet *);
245 static void bridge_stop(struct ifnet *, int);
246 static int bridge_transmit(struct ifnet *, struct mbuf *);
247 static void bridge_qflush(struct ifnet *);
248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
249 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
250 struct rtentry *);
251 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
252 struct mbuf *);
253 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
254
255 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
256 struct mbuf *m);
257
258 static void bridge_timer(void *);
259
260 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
261 struct mbuf *, int);
262 static void bridge_span(struct bridge_softc *, struct mbuf *);
263
264 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
265 uint16_t, struct bridge_iflist *, int, uint8_t);
266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
267 uint16_t);
268 static void bridge_rttrim(struct bridge_softc *);
269 static void bridge_rtage(struct bridge_softc *);
270 static void bridge_rtflush(struct bridge_softc *, int);
271 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
272 uint16_t);
273
274 static void bridge_rtable_init(struct bridge_softc *);
275 static void bridge_rtable_fini(struct bridge_softc *);
276
277 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
279 const uint8_t *, uint16_t);
280 static int bridge_rtnode_insert(struct bridge_softc *,
281 struct bridge_rtnode *);
282 static void bridge_rtnode_destroy(struct bridge_softc *,
283 struct bridge_rtnode *);
284 static void bridge_rtable_expire(struct ifnet *, int);
285 static void bridge_state_change(struct ifnet *, int);
286
287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
288 const char *name);
289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
290 struct ifnet *ifp);
291 static void bridge_delete_member(struct bridge_softc *,
292 struct bridge_iflist *, int);
293 static void bridge_delete_span(struct bridge_softc *,
294 struct bridge_iflist *);
295
296 static int bridge_ioctl_add(struct bridge_softc *, void *);
297 static int bridge_ioctl_del(struct bridge_softc *, void *);
298 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
299 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
300 static int bridge_ioctl_scache(struct bridge_softc *, void *);
301 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
302 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
303 static int bridge_ioctl_rts(struct bridge_softc *, void *);
304 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
305 static int bridge_ioctl_sto(struct bridge_softc *, void *);
306 static int bridge_ioctl_gto(struct bridge_softc *, void *);
307 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
308 static int bridge_ioctl_flush(struct bridge_softc *, void *);
309 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
310 static int bridge_ioctl_spri(struct bridge_softc *, void *);
311 static int bridge_ioctl_ght(struct bridge_softc *, void *);
312 static int bridge_ioctl_sht(struct bridge_softc *, void *);
313 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
314 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
315 static int bridge_ioctl_gma(struct bridge_softc *, void *);
316 static int bridge_ioctl_sma(struct bridge_softc *, void *);
317 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
318 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
319 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
320 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
321 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
322 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
323 static int bridge_ioctl_grte(struct bridge_softc *, void *);
324 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
325 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
326 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
327 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
328 int);
329 static int bridge_ip_checkbasic(struct mbuf **mp);
330 #ifdef INET6
331 static int bridge_ip6_checkbasic(struct mbuf **mp);
332 #endif /* INET6 */
333 static int bridge_fragment(struct ifnet *, struct mbuf *,
334 struct ether_header *, int, struct llc *);
335 static void bridge_linkstate(struct ifnet *ifp);
336 static void bridge_linkcheck(struct bridge_softc *sc);
337
338 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
339
340 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
341 #define VLANTAGOF(_m) \
342 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
343
344 static struct bstp_cb_ops bridge_ops = {
345 .bcb_state = bridge_state_change,
346 .bcb_rtage = bridge_rtable_expire
347 };
348
349 SYSCTL_DECL(_net_link);
350 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
351
352 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
353 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
354 static int pfil_member = 1; /* run pfil hooks on the member interface */
355 static int pfil_ipfw = 0; /* layer2 filter with ipfw */
356 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */
357 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
358 locally destined packets */
359 static int log_stp = 0; /* log STP state changes */
360 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */
361 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
363 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
364 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
365 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
366 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
367 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
369 &pfil_bridge, 0, "Packet filter on the bridge interface");
370 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
371 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
372 &pfil_member, 0, "Packet filter on the member interface");
373 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
374 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
375 &pfil_local_phys, 0,
376 "Packet filter on the physical interface for locally destined packets");
377 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
378 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
379 &log_stp, 0, "Log STP state changes");
380 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
381 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
382 &bridge_inherit_mac, 0,
383 "Inherit MAC address from the first bridge member");
384
385 static VNET_DEFINE(int, allow_llz_overlap) = 0;
386 #define V_allow_llz_overlap VNET(allow_llz_overlap)
387 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
388 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
389 "zones of a bridge interface and the member interfaces");
390
391 struct bridge_control {
392 int (*bc_func)(struct bridge_softc *, void *);
393 int bc_argsize;
394 int bc_flags;
395 };
396
397 #define BC_F_COPYIN 0x01 /* copy arguments in */
398 #define BC_F_COPYOUT 0x02 /* copy arguments out */
399 #define BC_F_SUSER 0x04 /* do super-user check */
400
401 const struct bridge_control bridge_control_table[] = {
402 { bridge_ioctl_add, sizeof(struct ifbreq),
403 BC_F_COPYIN|BC_F_SUSER },
404 { bridge_ioctl_del, sizeof(struct ifbreq),
405 BC_F_COPYIN|BC_F_SUSER },
406
407 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
408 BC_F_COPYIN|BC_F_COPYOUT },
409 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
410 BC_F_COPYIN|BC_F_SUSER },
411
412 { bridge_ioctl_scache, sizeof(struct ifbrparam),
413 BC_F_COPYIN|BC_F_SUSER },
414 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
415 BC_F_COPYOUT },
416
417 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
418 BC_F_COPYIN|BC_F_COPYOUT },
419 { bridge_ioctl_rts, sizeof(struct ifbaconf),
420 BC_F_COPYIN|BC_F_COPYOUT },
421
422 { bridge_ioctl_saddr, sizeof(struct ifbareq),
423 BC_F_COPYIN|BC_F_SUSER },
424
425 { bridge_ioctl_sto, sizeof(struct ifbrparam),
426 BC_F_COPYIN|BC_F_SUSER },
427 { bridge_ioctl_gto, sizeof(struct ifbrparam),
428 BC_F_COPYOUT },
429
430 { bridge_ioctl_daddr, sizeof(struct ifbareq),
431 BC_F_COPYIN|BC_F_SUSER },
432
433 { bridge_ioctl_flush, sizeof(struct ifbreq),
434 BC_F_COPYIN|BC_F_SUSER },
435
436 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
437 BC_F_COPYOUT },
438 { bridge_ioctl_spri, sizeof(struct ifbrparam),
439 BC_F_COPYIN|BC_F_SUSER },
440
441 { bridge_ioctl_ght, sizeof(struct ifbrparam),
442 BC_F_COPYOUT },
443 { bridge_ioctl_sht, sizeof(struct ifbrparam),
444 BC_F_COPYIN|BC_F_SUSER },
445
446 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
447 BC_F_COPYOUT },
448 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
449 BC_F_COPYIN|BC_F_SUSER },
450
451 { bridge_ioctl_gma, sizeof(struct ifbrparam),
452 BC_F_COPYOUT },
453 { bridge_ioctl_sma, sizeof(struct ifbrparam),
454 BC_F_COPYIN|BC_F_SUSER },
455
456 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
457 BC_F_COPYIN|BC_F_SUSER },
458
459 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
460 BC_F_COPYIN|BC_F_SUSER },
461
462 { bridge_ioctl_addspan, sizeof(struct ifbreq),
463 BC_F_COPYIN|BC_F_SUSER },
464 { bridge_ioctl_delspan, sizeof(struct ifbreq),
465 BC_F_COPYIN|BC_F_SUSER },
466
467 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
468 BC_F_COPYOUT },
469
470 { bridge_ioctl_grte, sizeof(struct ifbrparam),
471 BC_F_COPYOUT },
472
473 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
474 BC_F_COPYIN|BC_F_COPYOUT },
475
476 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
477 BC_F_COPYIN|BC_F_SUSER },
478
479 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
480 BC_F_COPYIN|BC_F_SUSER },
481
482 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
483 BC_F_COPYIN|BC_F_SUSER },
484
485 };
486 const int bridge_control_table_size =
487 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
488
489 LIST_HEAD(, bridge_softc) bridge_list;
490
491 static struct if_clone *bridge_cloner;
492 static const char bridge_name[] = "bridge";
493
494 static int
495 bridge_modevent(module_t mod, int type, void *data)
496 {
497
498 switch (type) {
499 case MOD_LOAD:
500 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
501 bridge_cloner = if_clone_simple(bridge_name,
502 bridge_clone_create, bridge_clone_destroy, 0);
503 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
504 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
505 UMA_ALIGN_PTR, 0);
506 LIST_INIT(&bridge_list);
507 bridge_input_p = bridge_input;
508 bridge_output_p = bridge_output;
509 bridge_dn_p = bridge_dummynet;
510 bridge_linkstate_p = bridge_linkstate;
511 bridge_detach_cookie = EVENTHANDLER_REGISTER(
512 ifnet_departure_event, bridge_ifdetach, NULL,
513 EVENTHANDLER_PRI_ANY);
514 break;
515 case MOD_UNLOAD:
516 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
517 bridge_detach_cookie);
518 if_clone_detach(bridge_cloner);
519 uma_zdestroy(bridge_rtnode_zone);
520 bridge_input_p = NULL;
521 bridge_output_p = NULL;
522 bridge_dn_p = NULL;
523 bridge_linkstate_p = NULL;
524 mtx_destroy(&bridge_list_mtx);
525 break;
526 default:
527 return (EOPNOTSUPP);
528 }
529 return (0);
530 }
531
532 static moduledata_t bridge_mod = {
533 "if_bridge",
534 bridge_modevent,
535 0
536 };
537
538 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
539 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
540
541 /*
542 * handler for net.link.bridge.ipfw
543 */
544 static int
545 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
546 {
547 int enable = pfil_ipfw;
548 int error;
549
550 error = sysctl_handle_int(oidp, &enable, 0, req);
551 enable = (enable) ? 1 : 0;
552
553 if (enable != pfil_ipfw) {
554 pfil_ipfw = enable;
555
556 /*
557 * Disable pfil so that ipfw doesnt run twice, if the user
558 * really wants both then they can re-enable pfil_bridge and/or
559 * pfil_member. Also allow non-ip packets as ipfw can filter by
560 * layer2 type.
561 */
562 if (pfil_ipfw) {
563 pfil_onlyip = 0;
564 pfil_bridge = 0;
565 pfil_member = 0;
566 }
567 }
568
569 return (error);
570 }
571 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
572 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
573
574 /*
575 * bridge_clone_create:
576 *
577 * Create a new bridge instance.
578 */
579 static int
580 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
581 {
582 struct bridge_softc *sc, *sc2;
583 struct ifnet *bifp, *ifp;
584 int fb, retry;
585 unsigned long hostid;
586
587 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
588 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
589 if (ifp == NULL) {
590 free(sc, M_DEVBUF);
591 return (ENOSPC);
592 }
593
594 BRIDGE_LOCK_INIT(sc);
595 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
596 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
597
598 /* Initialize our routing table. */
599 bridge_rtable_init(sc);
600
601 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
602
603 LIST_INIT(&sc->sc_iflist);
604 LIST_INIT(&sc->sc_spanlist);
605
606 ifp->if_softc = sc;
607 if_initname(ifp, bridge_name, unit);
608 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
609 ifp->if_ioctl = bridge_ioctl;
610 ifp->if_transmit = bridge_transmit;
611 ifp->if_qflush = bridge_qflush;
612 ifp->if_init = bridge_init;
613 ifp->if_type = IFT_BRIDGE;
614
615 /*
616 * Generate an ethernet address with a locally administered address.
617 *
618 * Since we are using random ethernet addresses for the bridge, it is
619 * possible that we might have address collisions, so make sure that
620 * this hardware address isn't already in use on another bridge.
621 * The first try uses the hostid and falls back to arc4rand().
622 */
623 fb = 0;
624 getcredhostid(curthread->td_ucred, &hostid);
625 do {
626 if (fb || hostid == 0) {
627 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
628 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
629 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
630 } else {
631 sc->sc_defaddr[0] = 0x2;
632 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
633 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
634 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
635 sc->sc_defaddr[4] = hostid & 0xff;
636 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
637 }
638
639 fb = 1;
640 retry = 0;
641 mtx_lock(&bridge_list_mtx);
642 LIST_FOREACH(sc2, &bridge_list, sc_list) {
643 bifp = sc2->sc_ifp;
644 if (memcmp(sc->sc_defaddr,
645 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
646 retry = 1;
647 break;
648 }
649 }
650 mtx_unlock(&bridge_list_mtx);
651 } while (retry == 1);
652
653 bstp_attach(&sc->sc_stp, &bridge_ops);
654 ether_ifattach(ifp, sc->sc_defaddr);
655 /* Now undo some of the damage... */
656 ifp->if_baudrate = 0;
657 ifp->if_type = IFT_BRIDGE;
658
659 mtx_lock(&bridge_list_mtx);
660 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
661 mtx_unlock(&bridge_list_mtx);
662
663 return (0);
664 }
665
666 /*
667 * bridge_clone_destroy:
668 *
669 * Destroy a bridge instance.
670 */
671 static void
672 bridge_clone_destroy(struct ifnet *ifp)
673 {
674 struct bridge_softc *sc = ifp->if_softc;
675 struct bridge_iflist *bif;
676
677 BRIDGE_LOCK(sc);
678
679 bridge_stop(ifp, 1);
680 ifp->if_flags &= ~IFF_UP;
681
682 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
683 bridge_delete_member(sc, bif, 0);
684
685 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
686 bridge_delete_span(sc, bif);
687 }
688
689 BRIDGE_UNLOCK(sc);
690
691 callout_drain(&sc->sc_brcallout);
692
693 mtx_lock(&bridge_list_mtx);
694 LIST_REMOVE(sc, sc_list);
695 mtx_unlock(&bridge_list_mtx);
696
697 bstp_detach(&sc->sc_stp);
698 ether_ifdetach(ifp);
699 if_free(ifp);
700
701 /* Tear down the routing table. */
702 bridge_rtable_fini(sc);
703
704 BRIDGE_LOCK_DESTROY(sc);
705 free(sc, M_DEVBUF);
706 }
707
708 /*
709 * bridge_ioctl:
710 *
711 * Handle a control request from the operator.
712 */
713 static int
714 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
715 {
716 struct bridge_softc *sc = ifp->if_softc;
717 struct ifreq *ifr = (struct ifreq *)data;
718 struct bridge_iflist *bif;
719 struct thread *td = curthread;
720 union {
721 struct ifbreq ifbreq;
722 struct ifbifconf ifbifconf;
723 struct ifbareq ifbareq;
724 struct ifbaconf ifbaconf;
725 struct ifbrparam ifbrparam;
726 struct ifbropreq ifbropreq;
727 } args;
728 struct ifdrv *ifd = (struct ifdrv *) data;
729 const struct bridge_control *bc;
730 int error = 0;
731
732 switch (cmd) {
733
734 case SIOCADDMULTI:
735 case SIOCDELMULTI:
736 break;
737
738 case SIOCGDRVSPEC:
739 case SIOCSDRVSPEC:
740 if (ifd->ifd_cmd >= bridge_control_table_size) {
741 error = EINVAL;
742 break;
743 }
744 bc = &bridge_control_table[ifd->ifd_cmd];
745
746 if (cmd == SIOCGDRVSPEC &&
747 (bc->bc_flags & BC_F_COPYOUT) == 0) {
748 error = EINVAL;
749 break;
750 }
751 else if (cmd == SIOCSDRVSPEC &&
752 (bc->bc_flags & BC_F_COPYOUT) != 0) {
753 error = EINVAL;
754 break;
755 }
756
757 if (bc->bc_flags & BC_F_SUSER) {
758 error = priv_check(td, PRIV_NET_BRIDGE);
759 if (error)
760 break;
761 }
762
763 if (ifd->ifd_len != bc->bc_argsize ||
764 ifd->ifd_len > sizeof(args)) {
765 error = EINVAL;
766 break;
767 }
768
769 bzero(&args, sizeof(args));
770 if (bc->bc_flags & BC_F_COPYIN) {
771 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
772 if (error)
773 break;
774 }
775
776 BRIDGE_LOCK(sc);
777 error = (*bc->bc_func)(sc, &args);
778 BRIDGE_UNLOCK(sc);
779 if (error)
780 break;
781
782 if (bc->bc_flags & BC_F_COPYOUT)
783 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
784
785 break;
786
787 case SIOCSIFFLAGS:
788 if (!(ifp->if_flags & IFF_UP) &&
789 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
790 /*
791 * If interface is marked down and it is running,
792 * then stop and disable it.
793 */
794 BRIDGE_LOCK(sc);
795 bridge_stop(ifp, 1);
796 BRIDGE_UNLOCK(sc);
797 } else if ((ifp->if_flags & IFF_UP) &&
798 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
799 /*
800 * If interface is marked up and it is stopped, then
801 * start it.
802 */
803 (*ifp->if_init)(sc);
804 }
805 break;
806
807 case SIOCSIFMTU:
808 if (ifr->ifr_mtu < 576) {
809 error = EINVAL;
810 break;
811 }
812 if (LIST_EMPTY(&sc->sc_iflist)) {
813 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
814 break;
815 }
816 BRIDGE_LOCK(sc);
817 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
818 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
819 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
820 " != %d\n", sc->sc_ifp->if_xname,
821 bif->bif_ifp->if_mtu,
822 bif->bif_ifp->if_xname, ifr->ifr_mtu);
823 error = EINVAL;
824 break;
825 }
826 }
827 if (!error)
828 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
829 BRIDGE_UNLOCK(sc);
830 break;
831 default:
832 /*
833 * drop the lock as ether_ioctl() will call bridge_start() and
834 * cause the lock to be recursed.
835 */
836 error = ether_ioctl(ifp, cmd, data);
837 break;
838 }
839
840 return (error);
841 }
842
843 /*
844 * bridge_mutecaps:
845 *
846 * Clear or restore unwanted capabilities on the member interface
847 */
848 static void
849 bridge_mutecaps(struct bridge_softc *sc)
850 {
851 struct bridge_iflist *bif;
852 int enabled, mask;
853
854 /* Initial bitmask of capabilities to test */
855 mask = BRIDGE_IFCAPS_MASK;
856
857 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
858 /* Every member must support it or its disabled */
859 mask &= bif->bif_savedcaps;
860 }
861
862 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
863 enabled = bif->bif_ifp->if_capenable;
864 enabled &= ~BRIDGE_IFCAPS_STRIP;
865 /* strip off mask bits and enable them again if allowed */
866 enabled &= ~BRIDGE_IFCAPS_MASK;
867 enabled |= mask;
868 bridge_set_ifcap(sc, bif, enabled);
869 }
870
871 }
872
873 static void
874 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
875 {
876 struct ifnet *ifp = bif->bif_ifp;
877 struct ifreq ifr;
878 int error;
879
880 bzero(&ifr, sizeof(ifr));
881 ifr.ifr_reqcap = set;
882
883 if (ifp->if_capenable != set) {
884 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
885 if (error)
886 if_printf(sc->sc_ifp,
887 "error setting interface capabilities on %s\n",
888 ifp->if_xname);
889 }
890 }
891
892 /*
893 * bridge_lookup_member:
894 *
895 * Lookup a bridge member interface.
896 */
897 static struct bridge_iflist *
898 bridge_lookup_member(struct bridge_softc *sc, const char *name)
899 {
900 struct bridge_iflist *bif;
901 struct ifnet *ifp;
902
903 BRIDGE_LOCK_ASSERT(sc);
904
905 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
906 ifp = bif->bif_ifp;
907 if (strcmp(ifp->if_xname, name) == 0)
908 return (bif);
909 }
910
911 return (NULL);
912 }
913
914 /*
915 * bridge_lookup_member_if:
916 *
917 * Lookup a bridge member interface by ifnet*.
918 */
919 static struct bridge_iflist *
920 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
921 {
922 struct bridge_iflist *bif;
923
924 BRIDGE_LOCK_ASSERT(sc);
925
926 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
927 if (bif->bif_ifp == member_ifp)
928 return (bif);
929 }
930
931 return (NULL);
932 }
933
934 /*
935 * bridge_delete_member:
936 *
937 * Delete the specified member interface.
938 */
939 static void
940 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
941 int gone)
942 {
943 struct ifnet *ifs = bif->bif_ifp;
944 struct ifnet *fif = NULL;
945
946 BRIDGE_LOCK_ASSERT(sc);
947
948 if (bif->bif_flags & IFBIF_STP)
949 bstp_disable(&bif->bif_stp);
950
951 ifs->if_bridge = NULL;
952 BRIDGE_XLOCK(sc);
953 LIST_REMOVE(bif, bif_next);
954 BRIDGE_XDROP(sc);
955
956 /*
957 * If removing the interface that gave the bridge its mac address, set
958 * the mac address of the bridge to the address of the next member, or
959 * to its default address if no members are left.
960 */
961 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
962 if (LIST_EMPTY(&sc->sc_iflist)) {
963 bcopy(sc->sc_defaddr,
964 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
965 sc->sc_ifaddr = NULL;
966 } else {
967 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
968 bcopy(IF_LLADDR(fif),
969 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
970 sc->sc_ifaddr = fif;
971 }
972 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
973 }
974
975 bridge_linkcheck(sc);
976 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
977 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
978 KASSERT(bif->bif_addrcnt == 0,
979 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
980
981 BRIDGE_UNLOCK(sc);
982 if (!gone) {
983 switch (ifs->if_type) {
984 case IFT_ETHER:
985 case IFT_L2VLAN:
986 /*
987 * Take the interface out of promiscuous mode.
988 */
989 (void) ifpromisc(ifs, 0);
990 break;
991
992 case IFT_GIF:
993 break;
994
995 default:
996 #ifdef DIAGNOSTIC
997 panic("bridge_delete_member: impossible");
998 #endif
999 break;
1000 }
1001 /* reneable any interface capabilities */
1002 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1003 }
1004 bstp_destroy(&bif->bif_stp); /* prepare to free */
1005 BRIDGE_LOCK(sc);
1006 free(bif, M_DEVBUF);
1007 }
1008
1009 /*
1010 * bridge_delete_span:
1011 *
1012 * Delete the specified span interface.
1013 */
1014 static void
1015 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1016 {
1017 BRIDGE_LOCK_ASSERT(sc);
1018
1019 KASSERT(bif->bif_ifp->if_bridge == NULL,
1020 ("%s: not a span interface", __func__));
1021
1022 LIST_REMOVE(bif, bif_next);
1023 free(bif, M_DEVBUF);
1024 }
1025
1026 static int
1027 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1028 {
1029 struct ifbreq *req = arg;
1030 struct bridge_iflist *bif = NULL;
1031 struct ifnet *ifs;
1032 int error = 0;
1033
1034 ifs = ifunit(req->ifbr_ifsname);
1035 if (ifs == NULL)
1036 return (ENOENT);
1037 if (ifs->if_ioctl == NULL) /* must be supported */
1038 return (EINVAL);
1039
1040 /* If it's in the span list, it can't be a member. */
1041 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1042 if (ifs == bif->bif_ifp)
1043 return (EBUSY);
1044
1045 if (ifs->if_bridge == sc)
1046 return (EEXIST);
1047
1048 if (ifs->if_bridge != NULL)
1049 return (EBUSY);
1050
1051 switch (ifs->if_type) {
1052 case IFT_ETHER:
1053 case IFT_L2VLAN:
1054 case IFT_GIF:
1055 /* permitted interface types */
1056 break;
1057 default:
1058 return (EINVAL);
1059 }
1060
1061 #ifdef INET6
1062 /*
1063 * Two valid inet6 addresses with link-local scope must not be
1064 * on the parent interface and the member interfaces at the
1065 * same time. This restriction is needed to prevent violation
1066 * of link-local scope zone. Attempts to add a member
1067 * interface which has inet6 addresses when the parent has
1068 * inet6 triggers removal of all inet6 addresses on the member
1069 * interface.
1070 */
1071
1072 /* Check if the parent interface has a link-local scope addr. */
1073 if (V_allow_llz_overlap == 0 &&
1074 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1075 /*
1076 * If any, remove all inet6 addresses from the member
1077 * interfaces.
1078 */
1079 BRIDGE_XLOCK(sc);
1080 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1081 if (in6ifa_llaonifp(bif->bif_ifp)) {
1082 BRIDGE_UNLOCK(sc);
1083 in6_ifdetach(bif->bif_ifp);
1084 BRIDGE_LOCK(sc);
1085 if_printf(sc->sc_ifp,
1086 "IPv6 addresses on %s have been removed "
1087 "before adding it as a member to prevent "
1088 "IPv6 address scope violation.\n",
1089 bif->bif_ifp->if_xname);
1090 }
1091 }
1092 BRIDGE_XDROP(sc);
1093 if (in6ifa_llaonifp(ifs)) {
1094 BRIDGE_UNLOCK(sc);
1095 in6_ifdetach(ifs);
1096 BRIDGE_LOCK(sc);
1097 if_printf(sc->sc_ifp,
1098 "IPv6 addresses on %s have been removed "
1099 "before adding it as a member to prevent "
1100 "IPv6 address scope violation.\n",
1101 ifs->if_xname);
1102 }
1103 }
1104 #endif
1105 /* Allow the first Ethernet member to define the MTU */
1106 if (LIST_EMPTY(&sc->sc_iflist))
1107 sc->sc_ifp->if_mtu = ifs->if_mtu;
1108 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1109 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1110 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1111 return (EINVAL);
1112 }
1113
1114 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1115 if (bif == NULL)
1116 return (ENOMEM);
1117
1118 bif->bif_ifp = ifs;
1119 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1120 bif->bif_savedcaps = ifs->if_capenable;
1121
1122 /*
1123 * Assign the interface's MAC address to the bridge if it's the first
1124 * member and the MAC address of the bridge has not been changed from
1125 * the default randomly generated one.
1126 */
1127 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1128 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1129 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1130 sc->sc_ifaddr = ifs;
1131 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1132 }
1133
1134 ifs->if_bridge = sc;
1135 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1136 /*
1137 * XXX: XLOCK HERE!?!
1138 *
1139 * NOTE: insert_***HEAD*** should be safe for the traversals.
1140 */
1141 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1142
1143 /* Set interface capabilities to the intersection set of all members */
1144 bridge_mutecaps(sc);
1145 bridge_linkcheck(sc);
1146
1147 /* Place the interface into promiscuous mode */
1148 switch (ifs->if_type) {
1149 case IFT_ETHER:
1150 case IFT_L2VLAN:
1151 BRIDGE_UNLOCK(sc);
1152 error = ifpromisc(ifs, 1);
1153 BRIDGE_LOCK(sc);
1154 break;
1155 }
1156
1157 if (error) {
1158 bridge_delete_member(sc, bif, 0);
1159 free(bif, M_DEVBUF);
1160 }
1161 return (error);
1162 }
1163
1164 static int
1165 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1166 {
1167 struct ifbreq *req = arg;
1168 struct bridge_iflist *bif;
1169
1170 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1171 if (bif == NULL)
1172 return (ENOENT);
1173
1174 bridge_delete_member(sc, bif, 0);
1175
1176 return (0);
1177 }
1178
1179 static int
1180 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1181 {
1182 struct ifbreq *req = arg;
1183 struct bridge_iflist *bif;
1184 struct bstp_port *bp;
1185
1186 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1187 if (bif == NULL)
1188 return (ENOENT);
1189
1190 bp = &bif->bif_stp;
1191 req->ifbr_ifsflags = bif->bif_flags;
1192 req->ifbr_state = bp->bp_state;
1193 req->ifbr_priority = bp->bp_priority;
1194 req->ifbr_path_cost = bp->bp_path_cost;
1195 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1196 req->ifbr_proto = bp->bp_protover;
1197 req->ifbr_role = bp->bp_role;
1198 req->ifbr_stpflags = bp->bp_flags;
1199 req->ifbr_addrcnt = bif->bif_addrcnt;
1200 req->ifbr_addrmax = bif->bif_addrmax;
1201 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1202
1203 /* Copy STP state options as flags */
1204 if (bp->bp_operedge)
1205 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1206 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1207 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1208 if (bp->bp_ptp_link)
1209 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1210 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1211 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1212 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1213 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1214 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1215 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1216 return (0);
1217 }
1218
1219 static int
1220 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1221 {
1222 struct ifbreq *req = arg;
1223 struct bridge_iflist *bif;
1224 struct bstp_port *bp;
1225 int error;
1226
1227 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1228 if (bif == NULL)
1229 return (ENOENT);
1230 bp = &bif->bif_stp;
1231
1232 if (req->ifbr_ifsflags & IFBIF_SPAN)
1233 /* SPAN is readonly */
1234 return (EINVAL);
1235
1236 if (req->ifbr_ifsflags & IFBIF_STP) {
1237 if ((bif->bif_flags & IFBIF_STP) == 0) {
1238 error = bstp_enable(&bif->bif_stp);
1239 if (error)
1240 return (error);
1241 }
1242 } else {
1243 if ((bif->bif_flags & IFBIF_STP) != 0)
1244 bstp_disable(&bif->bif_stp);
1245 }
1246
1247 /* Pass on STP flags */
1248 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1249 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1250 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1251 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1252
1253 /* Save the bits relating to the bridge */
1254 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1255
1256 return (0);
1257 }
1258
1259 static int
1260 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1261 {
1262 struct ifbrparam *param = arg;
1263
1264 sc->sc_brtmax = param->ifbrp_csize;
1265 bridge_rttrim(sc);
1266
1267 return (0);
1268 }
1269
1270 static int
1271 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1272 {
1273 struct ifbrparam *param = arg;
1274
1275 param->ifbrp_csize = sc->sc_brtmax;
1276
1277 return (0);
1278 }
1279
1280 static int
1281 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1282 {
1283 struct ifbifconf *bifc = arg;
1284 struct bridge_iflist *bif;
1285 struct ifbreq breq;
1286 char *buf, *outbuf;
1287 int count, buflen, len, error = 0;
1288
1289 count = 0;
1290 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1291 count++;
1292 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1293 count++;
1294
1295 buflen = sizeof(breq) * count;
1296 if (bifc->ifbic_len == 0) {
1297 bifc->ifbic_len = buflen;
1298 return (0);
1299 }
1300 BRIDGE_UNLOCK(sc);
1301 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1302 BRIDGE_LOCK(sc);
1303
1304 count = 0;
1305 buf = outbuf;
1306 len = min(bifc->ifbic_len, buflen);
1307 bzero(&breq, sizeof(breq));
1308 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1309 if (len < sizeof(breq))
1310 break;
1311
1312 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1313 sizeof(breq.ifbr_ifsname));
1314 /* Fill in the ifbreq structure */
1315 error = bridge_ioctl_gifflags(sc, &breq);
1316 if (error)
1317 break;
1318 memcpy(buf, &breq, sizeof(breq));
1319 count++;
1320 buf += sizeof(breq);
1321 len -= sizeof(breq);
1322 }
1323 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1324 if (len < sizeof(breq))
1325 break;
1326
1327 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1328 sizeof(breq.ifbr_ifsname));
1329 breq.ifbr_ifsflags = bif->bif_flags;
1330 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1331 memcpy(buf, &breq, sizeof(breq));
1332 count++;
1333 buf += sizeof(breq);
1334 len -= sizeof(breq);
1335 }
1336
1337 BRIDGE_UNLOCK(sc);
1338 bifc->ifbic_len = sizeof(breq) * count;
1339 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1340 BRIDGE_LOCK(sc);
1341 free(outbuf, M_TEMP);
1342 return (error);
1343 }
1344
1345 static int
1346 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1347 {
1348 struct ifbaconf *bac = arg;
1349 struct bridge_rtnode *brt;
1350 struct ifbareq bareq;
1351 char *buf, *outbuf;
1352 int count, buflen, len, error = 0;
1353
1354 if (bac->ifbac_len == 0)
1355 return (0);
1356
1357 count = 0;
1358 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1359 count++;
1360 buflen = sizeof(bareq) * count;
1361
1362 BRIDGE_UNLOCK(sc);
1363 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1364 BRIDGE_LOCK(sc);
1365
1366 count = 0;
1367 buf = outbuf;
1368 len = min(bac->ifbac_len, buflen);
1369 bzero(&bareq, sizeof(bareq));
1370 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1371 if (len < sizeof(bareq))
1372 goto out;
1373 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1374 sizeof(bareq.ifba_ifsname));
1375 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1376 bareq.ifba_vlan = brt->brt_vlan;
1377 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1378 time_uptime < brt->brt_expire)
1379 bareq.ifba_expire = brt->brt_expire - time_uptime;
1380 else
1381 bareq.ifba_expire = 0;
1382 bareq.ifba_flags = brt->brt_flags;
1383
1384 memcpy(buf, &bareq, sizeof(bareq));
1385 count++;
1386 buf += sizeof(bareq);
1387 len -= sizeof(bareq);
1388 }
1389 out:
1390 BRIDGE_UNLOCK(sc);
1391 bac->ifbac_len = sizeof(bareq) * count;
1392 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1393 BRIDGE_LOCK(sc);
1394 free(outbuf, M_TEMP);
1395 return (error);
1396 }
1397
1398 static int
1399 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1400 {
1401 struct ifbareq *req = arg;
1402 struct bridge_iflist *bif;
1403 int error;
1404
1405 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1406 if (bif == NULL)
1407 return (ENOENT);
1408
1409 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1410 req->ifba_flags);
1411
1412 return (error);
1413 }
1414
1415 static int
1416 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1417 {
1418 struct ifbrparam *param = arg;
1419
1420 sc->sc_brttimeout = param->ifbrp_ctime;
1421 return (0);
1422 }
1423
1424 static int
1425 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1426 {
1427 struct ifbrparam *param = arg;
1428
1429 param->ifbrp_ctime = sc->sc_brttimeout;
1430 return (0);
1431 }
1432
1433 static int
1434 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1435 {
1436 struct ifbareq *req = arg;
1437
1438 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1439 }
1440
1441 static int
1442 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1443 {
1444 struct ifbreq *req = arg;
1445
1446 bridge_rtflush(sc, req->ifbr_ifsflags);
1447 return (0);
1448 }
1449
1450 static int
1451 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1452 {
1453 struct ifbrparam *param = arg;
1454 struct bstp_state *bs = &sc->sc_stp;
1455
1456 param->ifbrp_prio = bs->bs_bridge_priority;
1457 return (0);
1458 }
1459
1460 static int
1461 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1462 {
1463 struct ifbrparam *param = arg;
1464
1465 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1466 }
1467
1468 static int
1469 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1470 {
1471 struct ifbrparam *param = arg;
1472 struct bstp_state *bs = &sc->sc_stp;
1473
1474 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1475 return (0);
1476 }
1477
1478 static int
1479 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1480 {
1481 struct ifbrparam *param = arg;
1482
1483 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1484 }
1485
1486 static int
1487 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1488 {
1489 struct ifbrparam *param = arg;
1490 struct bstp_state *bs = &sc->sc_stp;
1491
1492 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1493 return (0);
1494 }
1495
1496 static int
1497 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1498 {
1499 struct ifbrparam *param = arg;
1500
1501 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1502 }
1503
1504 static int
1505 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1506 {
1507 struct ifbrparam *param = arg;
1508 struct bstp_state *bs = &sc->sc_stp;
1509
1510 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1511 return (0);
1512 }
1513
1514 static int
1515 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1516 {
1517 struct ifbrparam *param = arg;
1518
1519 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1520 }
1521
1522 static int
1523 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1524 {
1525 struct ifbreq *req = arg;
1526 struct bridge_iflist *bif;
1527
1528 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1529 if (bif == NULL)
1530 return (ENOENT);
1531
1532 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1533 }
1534
1535 static int
1536 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1537 {
1538 struct ifbreq *req = arg;
1539 struct bridge_iflist *bif;
1540
1541 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1542 if (bif == NULL)
1543 return (ENOENT);
1544
1545 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1546 }
1547
1548 static int
1549 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1550 {
1551 struct ifbreq *req = arg;
1552 struct bridge_iflist *bif;
1553
1554 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1555 if (bif == NULL)
1556 return (ENOENT);
1557
1558 bif->bif_addrmax = req->ifbr_addrmax;
1559 return (0);
1560 }
1561
1562 static int
1563 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1564 {
1565 struct ifbreq *req = arg;
1566 struct bridge_iflist *bif = NULL;
1567 struct ifnet *ifs;
1568
1569 ifs = ifunit(req->ifbr_ifsname);
1570 if (ifs == NULL)
1571 return (ENOENT);
1572
1573 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1574 if (ifs == bif->bif_ifp)
1575 return (EBUSY);
1576
1577 if (ifs->if_bridge != NULL)
1578 return (EBUSY);
1579
1580 switch (ifs->if_type) {
1581 case IFT_ETHER:
1582 case IFT_GIF:
1583 case IFT_L2VLAN:
1584 break;
1585 default:
1586 return (EINVAL);
1587 }
1588
1589 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1590 if (bif == NULL)
1591 return (ENOMEM);
1592
1593 bif->bif_ifp = ifs;
1594 bif->bif_flags = IFBIF_SPAN;
1595
1596 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1597
1598 return (0);
1599 }
1600
1601 static int
1602 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1603 {
1604 struct ifbreq *req = arg;
1605 struct bridge_iflist *bif;
1606 struct ifnet *ifs;
1607
1608 ifs = ifunit(req->ifbr_ifsname);
1609 if (ifs == NULL)
1610 return (ENOENT);
1611
1612 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1613 if (ifs == bif->bif_ifp)
1614 break;
1615
1616 if (bif == NULL)
1617 return (ENOENT);
1618
1619 bridge_delete_span(sc, bif);
1620
1621 return (0);
1622 }
1623
1624 static int
1625 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1626 {
1627 struct ifbropreq *req = arg;
1628 struct bstp_state *bs = &sc->sc_stp;
1629 struct bstp_port *root_port;
1630
1631 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1632 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1633 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1634
1635 root_port = bs->bs_root_port;
1636 if (root_port == NULL)
1637 req->ifbop_root_port = 0;
1638 else
1639 req->ifbop_root_port = root_port->bp_ifp->if_index;
1640
1641 req->ifbop_holdcount = bs->bs_txholdcount;
1642 req->ifbop_priority = bs->bs_bridge_priority;
1643 req->ifbop_protocol = bs->bs_protover;
1644 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1645 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1646 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1647 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1648 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1649 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1650
1651 return (0);
1652 }
1653
1654 static int
1655 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1656 {
1657 struct ifbrparam *param = arg;
1658
1659 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1660 return (0);
1661 }
1662
1663 static int
1664 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1665 {
1666 struct ifbpstpconf *bifstp = arg;
1667 struct bridge_iflist *bif;
1668 struct bstp_port *bp;
1669 struct ifbpstpreq bpreq;
1670 char *buf, *outbuf;
1671 int count, buflen, len, error = 0;
1672
1673 count = 0;
1674 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1675 if ((bif->bif_flags & IFBIF_STP) != 0)
1676 count++;
1677 }
1678
1679 buflen = sizeof(bpreq) * count;
1680 if (bifstp->ifbpstp_len == 0) {
1681 bifstp->ifbpstp_len = buflen;
1682 return (0);
1683 }
1684
1685 BRIDGE_UNLOCK(sc);
1686 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1687 BRIDGE_LOCK(sc);
1688
1689 count = 0;
1690 buf = outbuf;
1691 len = min(bifstp->ifbpstp_len, buflen);
1692 bzero(&bpreq, sizeof(bpreq));
1693 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1694 if (len < sizeof(bpreq))
1695 break;
1696
1697 if ((bif->bif_flags & IFBIF_STP) == 0)
1698 continue;
1699
1700 bp = &bif->bif_stp;
1701 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1702 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1703 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1704 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1705 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1706 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1707
1708 memcpy(buf, &bpreq, sizeof(bpreq));
1709 count++;
1710 buf += sizeof(bpreq);
1711 len -= sizeof(bpreq);
1712 }
1713
1714 BRIDGE_UNLOCK(sc);
1715 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1716 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1717 BRIDGE_LOCK(sc);
1718 free(outbuf, M_TEMP);
1719 return (error);
1720 }
1721
1722 static int
1723 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1724 {
1725 struct ifbrparam *param = arg;
1726
1727 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1728 }
1729
1730 static int
1731 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1732 {
1733 struct ifbrparam *param = arg;
1734
1735 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1736 }
1737
1738 /*
1739 * bridge_ifdetach:
1740 *
1741 * Detach an interface from a bridge. Called when a member
1742 * interface is detaching.
1743 */
1744 static void
1745 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1746 {
1747 struct bridge_softc *sc = ifp->if_bridge;
1748 struct bridge_iflist *bif;
1749
1750 if (ifp->if_flags & IFF_RENAMING)
1751 return;
1752
1753 /* Check if the interface is a bridge member */
1754 if (sc != NULL) {
1755 BRIDGE_LOCK(sc);
1756
1757 bif = bridge_lookup_member_if(sc, ifp);
1758 if (bif != NULL)
1759 bridge_delete_member(sc, bif, 1);
1760
1761 BRIDGE_UNLOCK(sc);
1762 return;
1763 }
1764
1765 /* Check if the interface is a span port */
1766 mtx_lock(&bridge_list_mtx);
1767 LIST_FOREACH(sc, &bridge_list, sc_list) {
1768 BRIDGE_LOCK(sc);
1769 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1770 if (ifp == bif->bif_ifp) {
1771 bridge_delete_span(sc, bif);
1772 break;
1773 }
1774
1775 BRIDGE_UNLOCK(sc);
1776 }
1777 mtx_unlock(&bridge_list_mtx);
1778 }
1779
1780 /*
1781 * bridge_init:
1782 *
1783 * Initialize a bridge interface.
1784 */
1785 static void
1786 bridge_init(void *xsc)
1787 {
1788 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1789 struct ifnet *ifp = sc->sc_ifp;
1790
1791 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1792 return;
1793
1794 BRIDGE_LOCK(sc);
1795 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1796 bridge_timer, sc);
1797
1798 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1799 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1800
1801 BRIDGE_UNLOCK(sc);
1802 }
1803
1804 /*
1805 * bridge_stop:
1806 *
1807 * Stop the bridge interface.
1808 */
1809 static void
1810 bridge_stop(struct ifnet *ifp, int disable)
1811 {
1812 struct bridge_softc *sc = ifp->if_softc;
1813
1814 BRIDGE_LOCK_ASSERT(sc);
1815
1816 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1817 return;
1818
1819 callout_stop(&sc->sc_brcallout);
1820 bstp_stop(&sc->sc_stp);
1821
1822 bridge_rtflush(sc, IFBF_FLUSHDYN);
1823
1824 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1825 }
1826
1827 /*
1828 * bridge_enqueue:
1829 *
1830 * Enqueue a packet on a bridge member interface.
1831 *
1832 */
1833 static int
1834 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1835 {
1836 int len, err = 0;
1837 short mflags;
1838 struct mbuf *m0;
1839
1840 /* We may be sending a fragment so traverse the mbuf */
1841 for (; m; m = m0) {
1842 m0 = m->m_nextpkt;
1843 m->m_nextpkt = NULL;
1844 len = m->m_pkthdr.len;
1845 mflags = m->m_flags;
1846
1847 /*
1848 * If underlying interface can not do VLAN tag insertion itself
1849 * then attach a packet tag that holds it.
1850 */
1851 if ((m->m_flags & M_VLANTAG) &&
1852 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1853 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1854 if (m == NULL) {
1855 if_printf(dst_ifp,
1856 "unable to prepend VLAN header\n");
1857 dst_ifp->if_oerrors++;
1858 continue;
1859 }
1860 m->m_flags &= ~M_VLANTAG;
1861 }
1862
1863 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1864 m_freem(m0);
1865 sc->sc_ifp->if_oerrors++;
1866 break;
1867 }
1868
1869 sc->sc_ifp->if_opackets++;
1870 sc->sc_ifp->if_obytes += len;
1871 if (mflags & M_MCAST)
1872 sc->sc_ifp->if_omcasts++;
1873 }
1874
1875 return (err);
1876 }
1877
1878 /*
1879 * bridge_dummynet:
1880 *
1881 * Receive a queued packet from dummynet and pass it on to the output
1882 * interface.
1883 *
1884 * The mbuf has the Ethernet header already attached.
1885 */
1886 static void
1887 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1888 {
1889 struct bridge_softc *sc;
1890
1891 sc = ifp->if_bridge;
1892
1893 /*
1894 * The packet didnt originate from a member interface. This should only
1895 * ever happen if a member interface is removed while packets are
1896 * queued for it.
1897 */
1898 if (sc == NULL) {
1899 m_freem(m);
1900 return;
1901 }
1902
1903 if (PFIL_HOOKED(&V_inet_pfil_hook)
1904 #ifdef INET6
1905 || PFIL_HOOKED(&V_inet6_pfil_hook)
1906 #endif
1907 ) {
1908 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1909 return;
1910 if (m == NULL)
1911 return;
1912 }
1913
1914 bridge_enqueue(sc, ifp, m);
1915 }
1916
1917 /*
1918 * bridge_output:
1919 *
1920 * Send output from a bridge member interface. This
1921 * performs the bridging function for locally originated
1922 * packets.
1923 *
1924 * The mbuf has the Ethernet header already attached. We must
1925 * enqueue or free the mbuf before returning.
1926 */
1927 static int
1928 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1929 struct rtentry *rt)
1930 {
1931 struct ether_header *eh;
1932 struct ifnet *dst_if;
1933 struct bridge_softc *sc;
1934 uint16_t vlan;
1935
1936 if (m->m_len < ETHER_HDR_LEN) {
1937 m = m_pullup(m, ETHER_HDR_LEN);
1938 if (m == NULL)
1939 return (0);
1940 }
1941
1942 eh = mtod(m, struct ether_header *);
1943 sc = ifp->if_bridge;
1944 vlan = VLANTAGOF(m);
1945
1946 BRIDGE_LOCK(sc);
1947
1948 /*
1949 * If bridge is down, but the original output interface is up,
1950 * go ahead and send out that interface. Otherwise, the packet
1951 * is dropped below.
1952 */
1953 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1954 dst_if = ifp;
1955 goto sendunicast;
1956 }
1957
1958 /*
1959 * If the packet is a multicast, or we don't know a better way to
1960 * get there, send to all interfaces.
1961 */
1962 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1963 dst_if = NULL;
1964 else
1965 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1966 if (dst_if == NULL) {
1967 struct bridge_iflist *bif;
1968 struct mbuf *mc;
1969 int error = 0, used = 0;
1970
1971 bridge_span(sc, m);
1972
1973 BRIDGE_LOCK2REF(sc, error);
1974 if (error) {
1975 m_freem(m);
1976 return (0);
1977 }
1978
1979 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1980 dst_if = bif->bif_ifp;
1981
1982 if (dst_if->if_type == IFT_GIF)
1983 continue;
1984 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1985 continue;
1986
1987 /*
1988 * If this is not the original output interface,
1989 * and the interface is participating in spanning
1990 * tree, make sure the port is in a state that
1991 * allows forwarding.
1992 */
1993 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1994 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1995 continue;
1996
1997 if (LIST_NEXT(bif, bif_next) == NULL) {
1998 used = 1;
1999 mc = m;
2000 } else {
2001 mc = m_copypacket(m, M_NOWAIT);
2002 if (mc == NULL) {
2003 sc->sc_ifp->if_oerrors++;
2004 continue;
2005 }
2006 }
2007
2008 bridge_enqueue(sc, dst_if, mc);
2009 }
2010 if (used == 0)
2011 m_freem(m);
2012 BRIDGE_UNREF(sc);
2013 return (0);
2014 }
2015
2016 sendunicast:
2017 /*
2018 * XXX Spanning tree consideration here?
2019 */
2020
2021 bridge_span(sc, m);
2022 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2023 m_freem(m);
2024 BRIDGE_UNLOCK(sc);
2025 return (0);
2026 }
2027
2028 BRIDGE_UNLOCK(sc);
2029 bridge_enqueue(sc, dst_if, m);
2030 return (0);
2031 }
2032
2033 /*
2034 * bridge_transmit:
2035 *
2036 * Do output on a bridge.
2037 *
2038 */
2039 static int
2040 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2041 {
2042 struct bridge_softc *sc;
2043 struct ether_header *eh;
2044 struct ifnet *dst_if;
2045 int error = 0;
2046
2047 sc = ifp->if_softc;
2048
2049 ETHER_BPF_MTAP(ifp, m);
2050
2051 eh = mtod(m, struct ether_header *);
2052
2053 BRIDGE_LOCK(sc);
2054 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2055 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2056 BRIDGE_UNLOCK(sc);
2057 error = bridge_enqueue(sc, dst_if, m);
2058 } else
2059 bridge_broadcast(sc, ifp, m, 0);
2060
2061 return (error);
2062 }
2063
2064 /*
2065 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2066 */
2067 static void
2068 bridge_qflush(struct ifnet *ifp __unused)
2069 {
2070 }
2071
2072 /*
2073 * bridge_forward:
2074 *
2075 * The forwarding function of the bridge.
2076 *
2077 * NOTE: Releases the lock on return.
2078 */
2079 static void
2080 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2081 struct mbuf *m)
2082 {
2083 struct bridge_iflist *dbif;
2084 struct ifnet *src_if, *dst_if, *ifp;
2085 struct ether_header *eh;
2086 uint16_t vlan;
2087 uint8_t *dst;
2088 int error;
2089
2090 src_if = m->m_pkthdr.rcvif;
2091 ifp = sc->sc_ifp;
2092
2093 ifp->if_ipackets++;
2094 ifp->if_ibytes += m->m_pkthdr.len;
2095 vlan = VLANTAGOF(m);
2096
2097 if ((sbif->bif_flags & IFBIF_STP) &&
2098 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2099 goto drop;
2100
2101 eh = mtod(m, struct ether_header *);
2102 dst = eh->ether_dhost;
2103
2104 /* If the interface is learning, record the address. */
2105 if (sbif->bif_flags & IFBIF_LEARNING) {
2106 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2107 sbif, 0, IFBAF_DYNAMIC);
2108 /*
2109 * If the interface has addresses limits then deny any source
2110 * that is not in the cache.
2111 */
2112 if (error && sbif->bif_addrmax)
2113 goto drop;
2114 }
2115
2116 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2117 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2118 goto drop;
2119
2120 /*
2121 * At this point, the port either doesn't participate
2122 * in spanning tree or it is in the forwarding state.
2123 */
2124
2125 /*
2126 * If the packet is unicast, destined for someone on
2127 * "this" side of the bridge, drop it.
2128 */
2129 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2130 dst_if = bridge_rtlookup(sc, dst, vlan);
2131 if (src_if == dst_if)
2132 goto drop;
2133 } else {
2134 /*
2135 * Check if its a reserved multicast address, any address
2136 * listed in 802.1D section 7.12.6 may not be forwarded by the
2137 * bridge.
2138 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2139 */
2140 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2141 dst[2] == 0xc2 && dst[3] == 0x00 &&
2142 dst[4] == 0x00 && dst[5] <= 0x0f)
2143 goto drop;
2144
2145 /* ...forward it to all interfaces. */
2146 ifp->if_imcasts++;
2147 dst_if = NULL;
2148 }
2149
2150 /*
2151 * If we have a destination interface which is a member of our bridge,
2152 * OR this is a unicast packet, push it through the bpf(4) machinery.
2153 * For broadcast or multicast packets, don't bother because it will
2154 * be reinjected into ether_input. We do this before we pass the packets
2155 * through the pfil(9) framework, as it is possible that pfil(9) will
2156 * drop the packet, or possibly modify it, making it difficult to debug
2157 * firewall issues on the bridge.
2158 */
2159 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2160 ETHER_BPF_MTAP(ifp, m);
2161
2162 /* run the packet filter */
2163 if (PFIL_HOOKED(&V_inet_pfil_hook)
2164 #ifdef INET6
2165 || PFIL_HOOKED(&V_inet6_pfil_hook)
2166 #endif
2167 ) {
2168 BRIDGE_UNLOCK(sc);
2169 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2170 return;
2171 if (m == NULL)
2172 return;
2173 BRIDGE_LOCK(sc);
2174 }
2175
2176 if (dst_if == NULL) {
2177 bridge_broadcast(sc, src_if, m, 1);
2178 return;
2179 }
2180
2181 /*
2182 * At this point, we're dealing with a unicast frame
2183 * going to a different interface.
2184 */
2185 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2186 goto drop;
2187
2188 dbif = bridge_lookup_member_if(sc, dst_if);
2189 if (dbif == NULL)
2190 /* Not a member of the bridge (anymore?) */
2191 goto drop;
2192
2193 /* Private segments can not talk to each other */
2194 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2195 goto drop;
2196
2197 if ((dbif->bif_flags & IFBIF_STP) &&
2198 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2199 goto drop;
2200
2201 BRIDGE_UNLOCK(sc);
2202
2203 if (PFIL_HOOKED(&V_inet_pfil_hook)
2204 #ifdef INET6
2205 || PFIL_HOOKED(&V_inet6_pfil_hook)
2206 #endif
2207 ) {
2208 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2209 return;
2210 if (m == NULL)
2211 return;
2212 }
2213
2214 bridge_enqueue(sc, dst_if, m);
2215 return;
2216
2217 drop:
2218 BRIDGE_UNLOCK(sc);
2219 m_freem(m);
2220 }
2221
2222 /*
2223 * bridge_input:
2224 *
2225 * Receive input from a member interface. Queue the packet for
2226 * bridging if it is not for us.
2227 */
2228 static struct mbuf *
2229 bridge_input(struct ifnet *ifp, struct mbuf *m)
2230 {
2231 struct bridge_softc *sc = ifp->if_bridge;
2232 struct bridge_iflist *bif, *bif2;
2233 struct ifnet *bifp;
2234 struct ether_header *eh;
2235 struct mbuf *mc, *mc2;
2236 uint16_t vlan;
2237 int error;
2238
2239 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2240 return (m);
2241
2242 bifp = sc->sc_ifp;
2243 vlan = VLANTAGOF(m);
2244
2245 /*
2246 * Implement support for bridge monitoring. If this flag has been
2247 * set on this interface, discard the packet once we push it through
2248 * the bpf(4) machinery, but before we do, increment the byte and
2249 * packet counters associated with this interface.
2250 */
2251 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2252 m->m_pkthdr.rcvif = bifp;
2253 ETHER_BPF_MTAP(bifp, m);
2254 bifp->if_ipackets++;
2255 bifp->if_ibytes += m->m_pkthdr.len;
2256 m_freem(m);
2257 return (NULL);
2258 }
2259 BRIDGE_LOCK(sc);
2260 bif = bridge_lookup_member_if(sc, ifp);
2261 if (bif == NULL) {
2262 BRIDGE_UNLOCK(sc);
2263 return (m);
2264 }
2265
2266 eh = mtod(m, struct ether_header *);
2267
2268 bridge_span(sc, m);
2269
2270 if (m->m_flags & (M_BCAST|M_MCAST)) {
2271 /* Tap off 802.1D packets; they do not get forwarded. */
2272 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2273 ETHER_ADDR_LEN) == 0) {
2274 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2275 BRIDGE_UNLOCK(sc);
2276 return (NULL);
2277 }
2278
2279 if ((bif->bif_flags & IFBIF_STP) &&
2280 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2281 BRIDGE_UNLOCK(sc);
2282 return (m);
2283 }
2284
2285 /*
2286 * Make a deep copy of the packet and enqueue the copy
2287 * for bridge processing; return the original packet for
2288 * local processing.
2289 */
2290 mc = m_dup(m, M_NOWAIT);
2291 if (mc == NULL) {
2292 BRIDGE_UNLOCK(sc);
2293 return (m);
2294 }
2295
2296 /* Perform the bridge forwarding function with the copy. */
2297 bridge_forward(sc, bif, mc);
2298
2299 /*
2300 * Reinject the mbuf as arriving on the bridge so we have a
2301 * chance at claiming multicast packets. We can not loop back
2302 * here from ether_input as a bridge is never a member of a
2303 * bridge.
2304 */
2305 KASSERT(bifp->if_bridge == NULL,
2306 ("loop created in bridge_input"));
2307 mc2 = m_dup(m, M_NOWAIT);
2308 if (mc2 != NULL) {
2309 /* Keep the layer3 header aligned */
2310 int i = min(mc2->m_pkthdr.len, max_protohdr);
2311 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2312 }
2313 if (mc2 != NULL) {
2314 mc2->m_pkthdr.rcvif = bifp;
2315 (*bifp->if_input)(bifp, mc2);
2316 }
2317
2318 /* Return the original packet for local processing. */
2319 return (m);
2320 }
2321
2322 if ((bif->bif_flags & IFBIF_STP) &&
2323 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2324 BRIDGE_UNLOCK(sc);
2325 return (m);
2326 }
2327
2328 #if (defined(INET) || defined(INET6))
2329 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2330 || ((iface)->if_carp \
2331 && (*carp_forus_p)((iface), eh->ether_dhost))
2332 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2333 || ((iface)->if_carp \
2334 && (*carp_forus_p)((iface), eh->ether_shost))
2335 #else
2336 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2337 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2338 #endif
2339
2340 #ifdef INET6
2341 # define OR_PFIL_HOOKED_INET6 \
2342 || PFIL_HOOKED(&V_inet6_pfil_hook)
2343 #else
2344 # define OR_PFIL_HOOKED_INET6
2345 #endif
2346
2347 #define GRAB_OUR_PACKETS(iface) \
2348 if ((iface)->if_type == IFT_GIF) \
2349 continue; \
2350 /* It is destined for us. */ \
2351 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2352 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2353 ) { \
2354 if ((iface)->if_type == IFT_BRIDGE) { \
2355 ETHER_BPF_MTAP(iface, m); \
2356 iface->if_ipackets++; \
2357 iface->if_ibytes += m->m_pkthdr.len; \
2358 /* Filter on the physical interface. */ \
2359 if (pfil_local_phys && \
2360 (PFIL_HOOKED(&V_inet_pfil_hook) \
2361 OR_PFIL_HOOKED_INET6)) { \
2362 if (bridge_pfil(&m, NULL, ifp, \
2363 PFIL_IN) != 0 || m == NULL) { \
2364 BRIDGE_UNLOCK(sc); \
2365 return (NULL); \
2366 } \
2367 eh = mtod(m, struct ether_header *); \
2368 } \
2369 } \
2370 if (bif->bif_flags & IFBIF_LEARNING) { \
2371 error = bridge_rtupdate(sc, eh->ether_shost, \
2372 vlan, bif, 0, IFBAF_DYNAMIC); \
2373 if (error && bif->bif_addrmax) { \
2374 BRIDGE_UNLOCK(sc); \
2375 m_freem(m); \
2376 return (NULL); \
2377 } \
2378 } \
2379 m->m_pkthdr.rcvif = iface; \
2380 BRIDGE_UNLOCK(sc); \
2381 return (m); \
2382 } \
2383 \
2384 /* We just received a packet that we sent out. */ \
2385 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2386 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2387 ) { \
2388 BRIDGE_UNLOCK(sc); \
2389 m_freem(m); \
2390 return (NULL); \
2391 }
2392
2393 /*
2394 * Unicast. Make sure it's not for the bridge.
2395 */
2396 do { GRAB_OUR_PACKETS(bifp) } while (0);
2397
2398 /*
2399 * Give a chance for ifp at first priority. This will help when the
2400 * packet comes through the interface like VLAN's with the same MACs
2401 * on several interfaces from the same bridge. This also will save
2402 * some CPU cycles in case the destination interface and the input
2403 * interface (eq ifp) are the same.
2404 */
2405 do { GRAB_OUR_PACKETS(ifp) } while (0);
2406
2407 /* Now check the all bridge members. */
2408 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2409 GRAB_OUR_PACKETS(bif2->bif_ifp)
2410 }
2411
2412 #undef OR_CARP_CHECK_WE_ARE_DST
2413 #undef OR_CARP_CHECK_WE_ARE_SRC
2414 #undef OR_PFIL_HOOKED_INET6
2415 #undef GRAB_OUR_PACKETS
2416
2417 /* Perform the bridge forwarding function. */
2418 bridge_forward(sc, bif, m);
2419
2420 return (NULL);
2421 }
2422
2423 /*
2424 * bridge_broadcast:
2425 *
2426 * Send a frame to all interfaces that are members of
2427 * the bridge, except for the one on which the packet
2428 * arrived.
2429 *
2430 * NOTE: Releases the lock on return.
2431 */
2432 static void
2433 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2434 struct mbuf *m, int runfilt)
2435 {
2436 struct bridge_iflist *dbif, *sbif;
2437 struct mbuf *mc;
2438 struct ifnet *dst_if;
2439 int error = 0, used = 0, i;
2440
2441 sbif = bridge_lookup_member_if(sc, src_if);
2442
2443 BRIDGE_LOCK2REF(sc, error);
2444 if (error) {
2445 m_freem(m);
2446 return;
2447 }
2448
2449 /* Filter on the bridge interface before broadcasting */
2450 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2451 #ifdef INET6
2452 || PFIL_HOOKED(&V_inet6_pfil_hook)
2453 #endif
2454 )) {
2455 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2456 goto out;
2457 if (m == NULL)
2458 goto out;
2459 }
2460
2461 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2462 dst_if = dbif->bif_ifp;
2463 if (dst_if == src_if)
2464 continue;
2465
2466 /* Private segments can not talk to each other */
2467 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2468 continue;
2469
2470 if ((dbif->bif_flags & IFBIF_STP) &&
2471 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2472 continue;
2473
2474 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2475 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2476 continue;
2477
2478 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2479 continue;
2480
2481 if (LIST_NEXT(dbif, bif_next) == NULL) {
2482 mc = m;
2483 used = 1;
2484 } else {
2485 mc = m_dup(m, M_NOWAIT);
2486 if (mc == NULL) {
2487 sc->sc_ifp->if_oerrors++;
2488 continue;
2489 }
2490 }
2491
2492 /*
2493 * Filter on the output interface. Pass a NULL bridge interface
2494 * pointer so we do not redundantly filter on the bridge for
2495 * each interface we broadcast on.
2496 */
2497 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2498 #ifdef INET6
2499 || PFIL_HOOKED(&V_inet6_pfil_hook)
2500 #endif
2501 )) {
2502 if (used == 0) {
2503 /* Keep the layer3 header aligned */
2504 i = min(mc->m_pkthdr.len, max_protohdr);
2505 mc = m_copyup(mc, i, ETHER_ALIGN);
2506 if (mc == NULL) {
2507 sc->sc_ifp->if_oerrors++;
2508 continue;
2509 }
2510 }
2511 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2512 continue;
2513 if (mc == NULL)
2514 continue;
2515 }
2516
2517 bridge_enqueue(sc, dst_if, mc);
2518 }
2519 if (used == 0)
2520 m_freem(m);
2521
2522 out:
2523 BRIDGE_UNREF(sc);
2524 }
2525
2526 /*
2527 * bridge_span:
2528 *
2529 * Duplicate a packet out one or more interfaces that are in span mode,
2530 * the original mbuf is unmodified.
2531 */
2532 static void
2533 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2534 {
2535 struct bridge_iflist *bif;
2536 struct ifnet *dst_if;
2537 struct mbuf *mc;
2538
2539 if (LIST_EMPTY(&sc->sc_spanlist))
2540 return;
2541
2542 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2543 dst_if = bif->bif_ifp;
2544
2545 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2546 continue;
2547
2548 mc = m_copypacket(m, M_NOWAIT);
2549 if (mc == NULL) {
2550 sc->sc_ifp->if_oerrors++;
2551 continue;
2552 }
2553
2554 bridge_enqueue(sc, dst_if, mc);
2555 }
2556 }
2557
2558 /*
2559 * bridge_rtupdate:
2560 *
2561 * Add a bridge routing entry.
2562 */
2563 static int
2564 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2565 struct bridge_iflist *bif, int setflags, uint8_t flags)
2566 {
2567 struct bridge_rtnode *brt;
2568 int error;
2569
2570 BRIDGE_LOCK_ASSERT(sc);
2571
2572 /* Check the source address is valid and not multicast. */
2573 if (ETHER_IS_MULTICAST(dst) ||
2574 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2575 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2576 return (EINVAL);
2577
2578 /* 802.1p frames map to vlan 1 */
2579 if (vlan == 0)
2580 vlan = 1;
2581
2582 /*
2583 * A route for this destination might already exist. If so,
2584 * update it, otherwise create a new one.
2585 */
2586 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2587 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2588 sc->sc_brtexceeded++;
2589 return (ENOSPC);
2590 }
2591 /* Check per interface address limits (if enabled) */
2592 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2593 bif->bif_addrexceeded++;
2594 return (ENOSPC);
2595 }
2596
2597 /*
2598 * Allocate a new bridge forwarding node, and
2599 * initialize the expiration time and Ethernet
2600 * address.
2601 */
2602 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2603 if (brt == NULL)
2604 return (ENOMEM);
2605
2606 if (bif->bif_flags & IFBIF_STICKY)
2607 brt->brt_flags = IFBAF_STICKY;
2608 else
2609 brt->brt_flags = IFBAF_DYNAMIC;
2610
2611 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2612 brt->brt_vlan = vlan;
2613
2614 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2615 uma_zfree(bridge_rtnode_zone, brt);
2616 return (error);
2617 }
2618 brt->brt_dst = bif;
2619 bif->bif_addrcnt++;
2620 }
2621
2622 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2623 brt->brt_dst != bif) {
2624 brt->brt_dst->bif_addrcnt--;
2625 brt->brt_dst = bif;
2626 brt->brt_dst->bif_addrcnt++;
2627 }
2628
2629 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2630 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2631 if (setflags)
2632 brt->brt_flags = flags;
2633
2634 return (0);
2635 }
2636
2637 /*
2638 * bridge_rtlookup:
2639 *
2640 * Lookup the destination interface for an address.
2641 */
2642 static struct ifnet *
2643 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2644 {
2645 struct bridge_rtnode *brt;
2646
2647 BRIDGE_LOCK_ASSERT(sc);
2648
2649 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2650 return (NULL);
2651
2652 return (brt->brt_ifp);
2653 }
2654
2655 /*
2656 * bridge_rttrim:
2657 *
2658 * Trim the routine table so that we have a number
2659 * of routing entries less than or equal to the
2660 * maximum number.
2661 */
2662 static void
2663 bridge_rttrim(struct bridge_softc *sc)
2664 {
2665 struct bridge_rtnode *brt, *nbrt;
2666
2667 BRIDGE_LOCK_ASSERT(sc);
2668
2669 /* Make sure we actually need to do this. */
2670 if (sc->sc_brtcnt <= sc->sc_brtmax)
2671 return;
2672
2673 /* Force an aging cycle; this might trim enough addresses. */
2674 bridge_rtage(sc);
2675 if (sc->sc_brtcnt <= sc->sc_brtmax)
2676 return;
2677
2678 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2679 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2680 bridge_rtnode_destroy(sc, brt);
2681 if (sc->sc_brtcnt <= sc->sc_brtmax)
2682 return;
2683 }
2684 }
2685 }
2686
2687 /*
2688 * bridge_timer:
2689 *
2690 * Aging timer for the bridge.
2691 */
2692 static void
2693 bridge_timer(void *arg)
2694 {
2695 struct bridge_softc *sc = arg;
2696
2697 BRIDGE_LOCK_ASSERT(sc);
2698
2699 bridge_rtage(sc);
2700
2701 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2702 callout_reset(&sc->sc_brcallout,
2703 bridge_rtable_prune_period * hz, bridge_timer, sc);
2704 }
2705
2706 /*
2707 * bridge_rtage:
2708 *
2709 * Perform an aging cycle.
2710 */
2711 static void
2712 bridge_rtage(struct bridge_softc *sc)
2713 {
2714 struct bridge_rtnode *brt, *nbrt;
2715
2716 BRIDGE_LOCK_ASSERT(sc);
2717
2718 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2719 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2720 if (time_uptime >= brt->brt_expire)
2721 bridge_rtnode_destroy(sc, brt);
2722 }
2723 }
2724 }
2725
2726 /*
2727 * bridge_rtflush:
2728 *
2729 * Remove all dynamic addresses from the bridge.
2730 */
2731 static void
2732 bridge_rtflush(struct bridge_softc *sc, int full)
2733 {
2734 struct bridge_rtnode *brt, *nbrt;
2735
2736 BRIDGE_LOCK_ASSERT(sc);
2737
2738 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2739 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2740 bridge_rtnode_destroy(sc, brt);
2741 }
2742 }
2743
2744 /*
2745 * bridge_rtdaddr:
2746 *
2747 * Remove an address from the table.
2748 */
2749 static int
2750 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2751 {
2752 struct bridge_rtnode *brt;
2753 int found = 0;
2754
2755 BRIDGE_LOCK_ASSERT(sc);
2756
2757 /*
2758 * If vlan is zero then we want to delete for all vlans so the lookup
2759 * may return more than one.
2760 */
2761 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2762 bridge_rtnode_destroy(sc, brt);
2763 found = 1;
2764 }
2765
2766 return (found ? 0 : ENOENT);
2767 }
2768
2769 /*
2770 * bridge_rtdelete:
2771 *
2772 * Delete routes to a speicifc member interface.
2773 */
2774 static void
2775 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2776 {
2777 struct bridge_rtnode *brt, *nbrt;
2778
2779 BRIDGE_LOCK_ASSERT(sc);
2780
2781 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2782 if (brt->brt_ifp == ifp && (full ||
2783 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2784 bridge_rtnode_destroy(sc, brt);
2785 }
2786 }
2787
2788 /*
2789 * bridge_rtable_init:
2790 *
2791 * Initialize the route table for this bridge.
2792 */
2793 static void
2794 bridge_rtable_init(struct bridge_softc *sc)
2795 {
2796 int i;
2797
2798 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2799 M_DEVBUF, M_WAITOK);
2800
2801 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2802 LIST_INIT(&sc->sc_rthash[i]);
2803
2804 sc->sc_rthash_key = arc4random();
2805 LIST_INIT(&sc->sc_rtlist);
2806 }
2807
2808 /*
2809 * bridge_rtable_fini:
2810 *
2811 * Deconstruct the route table for this bridge.
2812 */
2813 static void
2814 bridge_rtable_fini(struct bridge_softc *sc)
2815 {
2816
2817 KASSERT(sc->sc_brtcnt == 0,
2818 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2819 free(sc->sc_rthash, M_DEVBUF);
2820 }
2821
2822 /*
2823 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2824 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2825 */
2826 #define mix(a, b, c) \
2827 do { \
2828 a -= b; a -= c; a ^= (c >> 13); \
2829 b -= c; b -= a; b ^= (a << 8); \
2830 c -= a; c -= b; c ^= (b >> 13); \
2831 a -= b; a -= c; a ^= (c >> 12); \
2832 b -= c; b -= a; b ^= (a << 16); \
2833 c -= a; c -= b; c ^= (b >> 5); \
2834 a -= b; a -= c; a ^= (c >> 3); \
2835 b -= c; b -= a; b ^= (a << 10); \
2836 c -= a; c -= b; c ^= (b >> 15); \
2837 } while (/*CONSTCOND*/0)
2838
2839 static __inline uint32_t
2840 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2841 {
2842 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2843
2844 b += addr[5] << 8;
2845 b += addr[4];
2846 a += addr[3] << 24;
2847 a += addr[2] << 16;
2848 a += addr[1] << 8;
2849 a += addr[0];
2850
2851 mix(a, b, c);
2852
2853 return (c & BRIDGE_RTHASH_MASK);
2854 }
2855
2856 #undef mix
2857
2858 static int
2859 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2860 {
2861 int i, d;
2862
2863 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2864 d = ((int)a[i]) - ((int)b[i]);
2865 }
2866
2867 return (d);
2868 }
2869
2870 /*
2871 * bridge_rtnode_lookup:
2872 *
2873 * Look up a bridge route node for the specified destination. Compare the
2874 * vlan id or if zero then just return the first match.
2875 */
2876 static struct bridge_rtnode *
2877 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2878 {
2879 struct bridge_rtnode *brt;
2880 uint32_t hash;
2881 int dir;
2882
2883 BRIDGE_LOCK_ASSERT(sc);
2884
2885 hash = bridge_rthash(sc, addr);
2886 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2887 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2888 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2889 return (brt);
2890 if (dir > 0)
2891 return (NULL);
2892 }
2893
2894 return (NULL);
2895 }
2896
2897 /*
2898 * bridge_rtnode_insert:
2899 *
2900 * Insert the specified bridge node into the route table. We
2901 * assume the entry is not already in the table.
2902 */
2903 static int
2904 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2905 {
2906 struct bridge_rtnode *lbrt;
2907 uint32_t hash;
2908 int dir;
2909
2910 BRIDGE_LOCK_ASSERT(sc);
2911
2912 hash = bridge_rthash(sc, brt->brt_addr);
2913
2914 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2915 if (lbrt == NULL) {
2916 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2917 goto out;
2918 }
2919
2920 do {
2921 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2922 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2923 return (EEXIST);
2924 if (dir > 0) {
2925 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2926 goto out;
2927 }
2928 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2929 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2930 goto out;
2931 }
2932 lbrt = LIST_NEXT(lbrt, brt_hash);
2933 } while (lbrt != NULL);
2934
2935 #ifdef DIAGNOSTIC
2936 panic("bridge_rtnode_insert: impossible");
2937 #endif
2938
2939 out:
2940 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2941 sc->sc_brtcnt++;
2942
2943 return (0);
2944 }
2945
2946 /*
2947 * bridge_rtnode_destroy:
2948 *
2949 * Destroy a bridge rtnode.
2950 */
2951 static void
2952 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2953 {
2954 BRIDGE_LOCK_ASSERT(sc);
2955
2956 LIST_REMOVE(brt, brt_hash);
2957
2958 LIST_REMOVE(brt, brt_list);
2959 sc->sc_brtcnt--;
2960 brt->brt_dst->bif_addrcnt--;
2961 uma_zfree(bridge_rtnode_zone, brt);
2962 }
2963
2964 /*
2965 * bridge_rtable_expire:
2966 *
2967 * Set the expiry time for all routes on an interface.
2968 */
2969 static void
2970 bridge_rtable_expire(struct ifnet *ifp, int age)
2971 {
2972 struct bridge_softc *sc = ifp->if_bridge;
2973 struct bridge_rtnode *brt;
2974
2975 BRIDGE_LOCK(sc);
2976
2977 /*
2978 * If the age is zero then flush, otherwise set all the expiry times to
2979 * age for the interface
2980 */
2981 if (age == 0)
2982 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2983 else {
2984 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2985 /* Cap the expiry time to 'age' */
2986 if (brt->brt_ifp == ifp &&
2987 brt->brt_expire > time_uptime + age &&
2988 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2989 brt->brt_expire = time_uptime + age;
2990 }
2991 }
2992 BRIDGE_UNLOCK(sc);
2993 }
2994
2995 /*
2996 * bridge_state_change:
2997 *
2998 * Callback from the bridgestp code when a port changes states.
2999 */
3000 static void
3001 bridge_state_change(struct ifnet *ifp, int state)
3002 {
3003 struct bridge_softc *sc = ifp->if_bridge;
3004 static const char *stpstates[] = {
3005 "disabled",
3006 "listening",
3007 "learning",
3008 "forwarding",
3009 "blocking",
3010 "discarding"
3011 };
3012
3013 if (log_stp)
3014 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3015 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3016 }
3017
3018 /*
3019 * Send bridge packets through pfil if they are one of the types pfil can deal
3020 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3021 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3022 * that interface.
3023 */
3024 static int
3025 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3026 {
3027 int snap, error, i, hlen;
3028 struct ether_header *eh1, eh2;
3029 struct ip *ip;
3030 struct llc llc1;
3031 u_int16_t ether_type;
3032
3033 snap = 0;
3034 error = -1; /* Default error if not error == 0 */
3035
3036 #if 0
3037 /* we may return with the IP fields swapped, ensure its not shared */
3038 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3039 #endif
3040
3041 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
3042 return (0); /* filtering is disabled */
3043
3044 i = min((*mp)->m_pkthdr.len, max_protohdr);
3045 if ((*mp)->m_len < i) {
3046 *mp = m_pullup(*mp, i);
3047 if (*mp == NULL) {
3048 printf("%s: m_pullup failed\n", __func__);
3049 return (-1);
3050 }
3051 }
3052
3053 eh1 = mtod(*mp, struct ether_header *);
3054 ether_type = ntohs(eh1->ether_type);
3055
3056 /*
3057 * Check for SNAP/LLC.
3058 */
3059 if (ether_type < ETHERMTU) {
3060 struct llc *llc2 = (struct llc *)(eh1 + 1);
3061
3062 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3063 llc2->llc_dsap == LLC_SNAP_LSAP &&
3064 llc2->llc_ssap == LLC_SNAP_LSAP &&
3065 llc2->llc_control == LLC_UI) {
3066 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3067 snap = 1;
3068 }
3069 }
3070
3071 /*
3072 * If we're trying to filter bridge traffic, don't look at anything
3073 * other than IP and ARP traffic. If the filter doesn't understand
3074 * IPv6, don't allow IPv6 through the bridge either. This is lame
3075 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3076 * but of course we don't have an AppleTalk filter to begin with.
3077 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3078 * ARP traffic.)
3079 */
3080 switch (ether_type) {
3081 case ETHERTYPE_ARP:
3082 case ETHERTYPE_REVARP:
3083 if (pfil_ipfw_arp == 0)
3084 return (0); /* Automatically pass */
3085 break;
3086
3087 case ETHERTYPE_IP:
3088 #ifdef INET6
3089 case ETHERTYPE_IPV6:
3090 #endif /* INET6 */
3091 break;
3092 default:
3093 /*
3094 * Check to see if the user wants to pass non-ip
3095 * packets, these will not be checked by pfil(9) and
3096 * passed unconditionally so the default is to drop.
3097 */
3098 if (pfil_onlyip)
3099 goto bad;
3100 }
3101
3102 /* Run the packet through pfil before stripping link headers */
3103 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 &&
3104 dir == PFIL_OUT && ifp != NULL) {
3105
3106 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3107
3108 if (*mp == NULL || error != 0) /* packet consumed by filter */
3109 return (error);
3110 }
3111
3112 /* Strip off the Ethernet header and keep a copy. */
3113 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3114 m_adj(*mp, ETHER_HDR_LEN);
3115
3116 /* Strip off snap header, if present */
3117 if (snap) {
3118 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3119 m_adj(*mp, sizeof(struct llc));
3120 }
3121
3122 /*
3123 * Check the IP header for alignment and errors
3124 */
3125 if (dir == PFIL_IN) {
3126 switch (ether_type) {
3127 case ETHERTYPE_IP:
3128 error = bridge_ip_checkbasic(mp);
3129 break;
3130 #ifdef INET6
3131 case ETHERTYPE_IPV6:
3132 error = bridge_ip6_checkbasic(mp);
3133 break;
3134 #endif /* INET6 */
3135 default:
3136 error = 0;
3137 }
3138 if (error)
3139 goto bad;
3140 }
3141
3142 error = 0;
3143
3144 /*
3145 * Run the packet through pfil
3146 */
3147 switch (ether_type) {
3148 case ETHERTYPE_IP:
3149 /*
3150 * Run pfil on the member interface and the bridge, both can
3151 * be skipped by clearing pfil_member or pfil_bridge.
3152 *
3153 * Keep the order:
3154 * in_if -> bridge_if -> out_if
3155 */
3156 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3157 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3158 dir, NULL);
3159
3160 if (*mp == NULL || error != 0) /* filter may consume */
3161 break;
3162
3163 if (pfil_member && ifp != NULL)
3164 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3165 dir, NULL);
3166
3167 if (*mp == NULL || error != 0) /* filter may consume */
3168 break;
3169
3170 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3171 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3172 dir, NULL);
3173
3174 if (*mp == NULL || error != 0) /* filter may consume */
3175 break;
3176
3177 /* check if we need to fragment the packet */
3178 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3179 i = (*mp)->m_pkthdr.len;
3180 if (i > ifp->if_mtu) {
3181 error = bridge_fragment(ifp, *mp, &eh2, snap,
3182 &llc1);
3183 return (error);
3184 }
3185 }
3186
3187 /* Recalculate the ip checksum. */
3188 ip = mtod(*mp, struct ip *);
3189 hlen = ip->ip_hl << 2;
3190 if (hlen < sizeof(struct ip))
3191 goto bad;
3192 if (hlen > (*mp)->m_len) {
3193 if ((*mp = m_pullup(*mp, hlen)) == 0)
3194 goto bad;
3195 ip = mtod(*mp, struct ip *);
3196 if (ip == NULL)
3197 goto bad;
3198 }
3199 ip->ip_sum = 0;
3200 if (hlen == sizeof(struct ip))
3201 ip->ip_sum = in_cksum_hdr(ip);
3202 else
3203 ip->ip_sum = in_cksum(*mp, hlen);
3204
3205 break;
3206 #ifdef INET6
3207 case ETHERTYPE_IPV6:
3208 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3209 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3210 dir, NULL);
3211
3212 if (*mp == NULL || error != 0) /* filter may consume */
3213 break;
3214
3215 if (pfil_member && ifp != NULL)
3216 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3217 dir, NULL);
3218
3219 if (*mp == NULL || error != 0) /* filter may consume */
3220 break;
3221
3222 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3223 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3224 dir, NULL);
3225 break;
3226 #endif
3227 default:
3228 error = 0;
3229 break;
3230 }
3231
3232 if (*mp == NULL)
3233 return (error);
3234 if (error != 0)
3235 goto bad;
3236
3237 error = -1;
3238
3239 /*
3240 * Finally, put everything back the way it was and return
3241 */
3242 if (snap) {
3243 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3244 if (*mp == NULL)
3245 return (error);
3246 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3247 }
3248
3249 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3250 if (*mp == NULL)
3251 return (error);
3252 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3253
3254 return (0);
3255
3256 bad:
3257 m_freem(*mp);
3258 *mp = NULL;
3259 return (error);
3260 }
3261
3262 /*
3263 * Perform basic checks on header size since
3264 * pfil assumes ip_input has already processed
3265 * it for it. Cut-and-pasted from ip_input.c.
3266 * Given how simple the IPv6 version is,
3267 * does the IPv4 version really need to be
3268 * this complicated?
3269 *
3270 * XXX Should we update ipstat here, or not?
3271 * XXX Right now we update ipstat but not
3272 * XXX csum_counter.
3273 */
3274 static int
3275 bridge_ip_checkbasic(struct mbuf **mp)
3276 {
3277 struct mbuf *m = *mp;
3278 struct ip *ip;
3279 int len, hlen;
3280 u_short sum;
3281
3282 if (*mp == NULL)
3283 return (-1);
3284
3285 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3286 if ((m = m_copyup(m, sizeof(struct ip),
3287 (max_linkhdr + 3) & ~3)) == NULL) {
3288 /* XXXJRT new stat, please */
3289 KMOD_IPSTAT_INC(ips_toosmall);
3290 goto bad;
3291 }
3292 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3293 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3294 KMOD_IPSTAT_INC(ips_toosmall);
3295 goto bad;
3296 }
3297 }
3298 ip = mtod(m, struct ip *);
3299 if (ip == NULL) goto bad;
3300
3301 if (ip->ip_v != IPVERSION) {
3302 KMOD_IPSTAT_INC(ips_badvers);
3303 goto bad;
3304 }
3305 hlen = ip->ip_hl << 2;
3306 if (hlen < sizeof(struct ip)) { /* minimum header length */
3307 KMOD_IPSTAT_INC(ips_badhlen);
3308 goto bad;
3309 }
3310 if (hlen > m->m_len) {
3311 if ((m = m_pullup(m, hlen)) == 0) {
3312 KMOD_IPSTAT_INC(ips_badhlen);
3313 goto bad;
3314 }
3315 ip = mtod(m, struct ip *);
3316 if (ip == NULL) goto bad;
3317 }
3318
3319 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3320 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3321 } else {
3322 if (hlen == sizeof(struct ip)) {
3323 sum = in_cksum_hdr(ip);
3324 } else {
3325 sum = in_cksum(m, hlen);
3326 }
3327 }
3328 if (sum) {
3329 KMOD_IPSTAT_INC(ips_badsum);
3330 goto bad;
3331 }
3332
3333 /* Retrieve the packet length. */
3334 len = ntohs(ip->ip_len);
3335
3336 /*
3337 * Check for additional length bogosity
3338 */
3339 if (len < hlen) {
3340 KMOD_IPSTAT_INC(ips_badlen);
3341 goto bad;
3342 }
3343
3344 /*
3345 * Check that the amount of data in the buffers
3346 * is as at least much as the IP header would have us expect.
3347 * Drop packet if shorter than we expect.
3348 */
3349 if (m->m_pkthdr.len < len) {
3350 KMOD_IPSTAT_INC(ips_tooshort);
3351 goto bad;
3352 }
3353
3354 /* Checks out, proceed */
3355 *mp = m;
3356 return (0);
3357
3358 bad:
3359 *mp = m;
3360 return (-1);
3361 }
3362
3363 #ifdef INET6
3364 /*
3365 * Same as above, but for IPv6.
3366 * Cut-and-pasted from ip6_input.c.
3367 * XXX Should we update ip6stat, or not?
3368 */
3369 static int
3370 bridge_ip6_checkbasic(struct mbuf **mp)
3371 {
3372 struct mbuf *m = *mp;
3373 struct ip6_hdr *ip6;
3374
3375 /*
3376 * If the IPv6 header is not aligned, slurp it up into a new
3377 * mbuf with space for link headers, in the event we forward
3378 * it. Otherwise, if it is aligned, make sure the entire base
3379 * IPv6 header is in the first mbuf of the chain.
3380 */
3381 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3382 struct ifnet *inifp = m->m_pkthdr.rcvif;
3383 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3384 (max_linkhdr + 3) & ~3)) == NULL) {
3385 /* XXXJRT new stat, please */
3386 IP6STAT_INC(ip6s_toosmall);
3387 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3388 goto bad;
3389 }
3390 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3391 struct ifnet *inifp = m->m_pkthdr.rcvif;
3392 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3393 IP6STAT_INC(ip6s_toosmall);
3394 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3395 goto bad;
3396 }
3397 }
3398
3399 ip6 = mtod(m, struct ip6_hdr *);
3400
3401 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3402 IP6STAT_INC(ip6s_badvers);
3403 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3404 goto bad;
3405 }
3406
3407 /* Checks out, proceed */
3408 *mp = m;
3409 return (0);
3410
3411 bad:
3412 *mp = m;
3413 return (-1);
3414 }
3415 #endif /* INET6 */
3416
3417 /*
3418 * bridge_fragment:
3419 *
3420 * Return a fragmented mbuf chain.
3421 */
3422 static int
3423 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3424 int snap, struct llc *llc)
3425 {
3426 struct mbuf *m0;
3427 struct ip *ip;
3428 int error = -1;
3429
3430 if (m->m_len < sizeof(struct ip) &&
3431 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3432 goto out;
3433 ip = mtod(m, struct ip *);
3434
3435 m->m_pkthdr.csum_flags |= CSUM_IP;
3436 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3437 if (error)
3438 goto out;
3439
3440 /* walk the chain and re-add the Ethernet header */
3441 for (m0 = m; m0; m0 = m0->m_nextpkt) {
3442 if (error == 0) {
3443 if (snap) {
3444 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT);
3445 if (m0 == NULL) {
3446 error = ENOBUFS;
3447 continue;
3448 }
3449 bcopy(llc, mtod(m0, caddr_t),
3450 sizeof(struct llc));
3451 }
3452 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT);
3453 if (m0 == NULL) {
3454 error = ENOBUFS;
3455 continue;
3456 }
3457 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3458 } else
3459 m_freem(m);
3460 }
3461
3462 if (error == 0)
3463 KMOD_IPSTAT_INC(ips_fragmented);
3464
3465 return (error);
3466
3467 out:
3468 if (m != NULL)
3469 m_freem(m);
3470 return (error);
3471 }
3472
3473 static void
3474 bridge_linkstate(struct ifnet *ifp)
3475 {
3476 struct bridge_softc *sc = ifp->if_bridge;
3477 struct bridge_iflist *bif;
3478
3479 BRIDGE_LOCK(sc);
3480 bif = bridge_lookup_member_if(sc, ifp);
3481 if (bif == NULL) {
3482 BRIDGE_UNLOCK(sc);
3483 return;
3484 }
3485 bridge_linkcheck(sc);
3486 BRIDGE_UNLOCK(sc);
3487
3488 bstp_linkstate(&bif->bif_stp);
3489 }
3490
3491 static void
3492 bridge_linkcheck(struct bridge_softc *sc)
3493 {
3494 struct bridge_iflist *bif;
3495 int new_link, hasls;
3496
3497 BRIDGE_LOCK_ASSERT(sc);
3498 new_link = LINK_STATE_DOWN;
3499 hasls = 0;
3500 /* Our link is considered up if at least one of our ports is active */
3501 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3502 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3503 hasls++;
3504 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3505 new_link = LINK_STATE_UP;
3506 break;
3507 }
3508 }
3509 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3510 /* If no interfaces support link-state then we default to up */
3511 new_link = LINK_STATE_UP;
3512 }
3513 if_link_state_change(sc->sc_ifp, new_link);
3514 }
Cache object: f0d879d16be651785ffd1a373b00d169
|