1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
4 * Copyright 2001 Wasabi Systems, Inc.
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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
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.
39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
40 * All rights reserved.
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
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.
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.
63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
67 * Network interface bridge support.
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 heterogeneous bridges).
77 #include <sys/cdefs.h>
78 __FBSDID("$FreeBSD$");
81 #include "opt_inet6.h"
83 #include <sys/param.h>
84 #include <sys/eventhandler.h>
86 #include <sys/malloc.h>
87 #include <sys/protosw.h>
88 #include <sys/systm.h>
91 #include <sys/socket.h> /* for net/if.h */
92 #include <sys/sockio.h>
93 #include <sys/ctype.h> /* string functions */
94 #include <sys/kernel.h>
95 #include <sys/random.h>
96 #include <sys/syslog.h>
97 #include <sys/sysctl.h>
99 #include <sys/module.h>
100 #include <sys/priv.h>
101 #include <sys/proc.h>
102 #include <sys/lock.h>
103 #include <sys/mutex.h>
107 #include <net/if_clone.h>
108 #include <net/if_dl.h>
109 #include <net/if_types.h>
110 #include <net/if_var.h>
111 #include <net/pfil.h>
112 #include <net/vnet.h>
114 #include <netinet/in.h>
115 #include <netinet/in_systm.h>
116 #include <netinet/in_var.h>
117 #include <netinet/ip.h>
118 #include <netinet/ip_var.h>
120 #include <netinet/ip6.h>
121 #include <netinet6/ip6_var.h>
122 #include <netinet6/in6_ifattach.h>
124 #if defined(INET) || defined(INET6)
125 #include <netinet/ip_carp.h>
127 #include <machine/in_cksum.h>
128 #include <netinet/if_ether.h>
129 #include <net/bridgestp.h>
130 #include <net/if_bridgevar.h>
131 #include <net/if_llc.h>
132 #include <net/if_vlan_var.h>
134 #include <net/route.h>
137 * Size of the route hash table. Must be a power of two.
139 #ifndef BRIDGE_RTHASH_SIZE
140 #define BRIDGE_RTHASH_SIZE 1024
143 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
146 * Default maximum number of addresses to cache.
148 #ifndef BRIDGE_RTABLE_MAX
149 #define BRIDGE_RTABLE_MAX 2000
153 * Timeout (in seconds) for entries learned dynamically.
155 #ifndef BRIDGE_RTABLE_TIMEOUT
156 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
160 * Number of seconds between walks of the route list.
162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
163 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
167 * List of capabilities to possibly mask on the member interface.
169 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
173 * List of capabilities to strip
175 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
178 * Bridge interface list entry.
180 struct bridge_iflist {
181 LIST_ENTRY(bridge_iflist) bif_next;
182 struct ifnet *bif_ifp; /* member if */
183 struct bstp_port bif_stp; /* STP state */
184 uint32_t bif_flags; /* member if flags */
185 int bif_savedcaps; /* saved capabilities */
186 uint32_t bif_addrmax; /* max # of addresses */
187 uint32_t bif_addrcnt; /* cur. # of addresses */
188 uint32_t bif_addrexceeded;/* # of address violations */
194 struct bridge_rtnode {
195 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
196 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
197 struct bridge_iflist *brt_dst; /* destination if */
198 unsigned long brt_expire; /* expiration time */
199 uint8_t brt_flags; /* address flags */
200 uint8_t brt_addr[ETHER_ADDR_LEN];
201 uint16_t brt_vlan; /* vlan id */
203 #define brt_ifp brt_dst->bif_ifp
206 * Software state for each bridge.
208 struct bridge_softc {
209 struct ifnet *sc_ifp; /* make this an interface */
210 LIST_ENTRY(bridge_softc) sc_list;
213 uint32_t sc_brtmax; /* max # of addresses */
214 uint32_t sc_brtcnt; /* cur. # of addresses */
215 uint32_t sc_brttimeout; /* rt timeout in seconds */
216 struct callout sc_brcallout; /* bridge callout */
217 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
218 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
219 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
220 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
221 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
222 uint32_t sc_rthash_key; /* key for hash */
223 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
224 struct bstp_state sc_stp; /* STP state */
225 uint32_t sc_brtexceeded; /* # of cache drops */
226 struct ifnet *sc_ifaddr; /* member mac copied from */
227 u_char sc_defaddr[6]; /* Default MAC address */
230 static VNET_DEFINE(struct mtx, bridge_list_mtx);
231 #define V_bridge_list_mtx VNET(bridge_list_mtx)
232 static eventhandler_tag bridge_detach_cookie;
234 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
236 uma_zone_t bridge_rtnode_zone;
238 static int bridge_clone_create(struct if_clone *, int, caddr_t);
239 static void bridge_clone_destroy(struct ifnet *);
241 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
242 static void bridge_mutecaps(struct bridge_softc *);
243 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
245 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
246 static void bridge_init(void *);
247 static void bridge_dummynet(struct mbuf *, struct ifnet *);
248 static void bridge_stop(struct ifnet *, int);
249 static int bridge_transmit(struct ifnet *, struct mbuf *);
250 static void bridge_qflush(struct ifnet *);
251 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
252 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
254 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
256 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
258 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
261 static void bridge_timer(void *);
263 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
265 static void bridge_span(struct bridge_softc *, struct mbuf *);
267 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
268 uint16_t, struct bridge_iflist *, int, uint8_t);
269 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
271 static void bridge_rttrim(struct bridge_softc *);
272 static void bridge_rtage(struct bridge_softc *);
273 static void bridge_rtflush(struct bridge_softc *, int);
274 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
277 static void bridge_rtable_init(struct bridge_softc *);
278 static void bridge_rtable_fini(struct bridge_softc *);
280 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
281 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
282 const uint8_t *, uint16_t);
283 static int bridge_rtnode_insert(struct bridge_softc *,
284 struct bridge_rtnode *);
285 static void bridge_rtnode_destroy(struct bridge_softc *,
286 struct bridge_rtnode *);
287 static void bridge_rtable_expire(struct ifnet *, int);
288 static void bridge_state_change(struct ifnet *, int);
290 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
292 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
294 static void bridge_delete_member(struct bridge_softc *,
295 struct bridge_iflist *, int);
296 static void bridge_delete_span(struct bridge_softc *,
297 struct bridge_iflist *);
299 static int bridge_ioctl_add(struct bridge_softc *, void *);
300 static int bridge_ioctl_del(struct bridge_softc *, void *);
301 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
302 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
303 static int bridge_ioctl_scache(struct bridge_softc *, void *);
304 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
305 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
306 static int bridge_ioctl_rts(struct bridge_softc *, void *);
307 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
308 static int bridge_ioctl_sto(struct bridge_softc *, void *);
309 static int bridge_ioctl_gto(struct bridge_softc *, void *);
310 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
311 static int bridge_ioctl_flush(struct bridge_softc *, void *);
312 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
313 static int bridge_ioctl_spri(struct bridge_softc *, void *);
314 static int bridge_ioctl_ght(struct bridge_softc *, void *);
315 static int bridge_ioctl_sht(struct bridge_softc *, void *);
316 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
317 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
318 static int bridge_ioctl_gma(struct bridge_softc *, void *);
319 static int bridge_ioctl_sma(struct bridge_softc *, void *);
320 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
321 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
322 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
323 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
324 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
325 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
326 static int bridge_ioctl_grte(struct bridge_softc *, void *);
327 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
328 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
329 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
330 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
332 static int bridge_ip_checkbasic(struct mbuf **mp);
334 static int bridge_ip6_checkbasic(struct mbuf **mp);
336 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
337 struct ether_header *, int, struct llc *);
338 static void bridge_linkstate(struct ifnet *ifp);
339 static void bridge_linkcheck(struct bridge_softc *sc);
341 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
343 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
344 #define VLANTAGOF(_m) \
345 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
347 static struct bstp_cb_ops bridge_ops = {
348 .bcb_state = bridge_state_change,
349 .bcb_rtage = bridge_rtable_expire
352 SYSCTL_DECL(_net_link);
353 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
355 /* only pass IP[46] packets when pfil is enabled */
356 static VNET_DEFINE(int, pfil_onlyip) = 1;
357 #define V_pfil_onlyip VNET(pfil_onlyip)
358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
359 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
360 "Only pass IP packets when pfil is enabled");
362 /* run pfil hooks on the bridge interface */
363 static VNET_DEFINE(int, pfil_bridge) = 1;
364 #define V_pfil_bridge VNET(pfil_bridge)
365 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
366 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
367 "Packet filter on the bridge interface");
369 /* layer2 filter with ipfw */
370 static VNET_DEFINE(int, pfil_ipfw);
371 #define V_pfil_ipfw VNET(pfil_ipfw)
373 /* layer2 ARP filter with ipfw */
374 static VNET_DEFINE(int, pfil_ipfw_arp);
375 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
376 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
377 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
378 "Filter ARP packets through IPFW layer2");
380 /* run pfil hooks on the member interface */
381 static VNET_DEFINE(int, pfil_member) = 1;
382 #define V_pfil_member VNET(pfil_member)
383 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
384 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
385 "Packet filter on the member interface");
387 /* run pfil hooks on the physical interface for locally destined packets */
388 static VNET_DEFINE(int, pfil_local_phys);
389 #define V_pfil_local_phys VNET(pfil_local_phys)
390 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
391 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
392 "Packet filter on the physical interface for locally destined packets");
394 /* log STP state changes */
395 static VNET_DEFINE(int, log_stp);
396 #define V_log_stp VNET(log_stp)
397 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
398 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
399 "Log STP state changes");
401 /* share MAC with first bridge member */
402 static VNET_DEFINE(int, bridge_inherit_mac);
403 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
404 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
405 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
406 "Inherit MAC address from the first bridge member");
408 static VNET_DEFINE(int, allow_llz_overlap) = 0;
409 #define V_allow_llz_overlap VNET(allow_llz_overlap)
410 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
411 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
412 "Allow overlap of link-local scope "
413 "zones of a bridge interface and the member interfaces");
415 struct bridge_control {
416 int (*bc_func)(struct bridge_softc *, void *);
421 #define BC_F_COPYIN 0x01 /* copy arguments in */
422 #define BC_F_COPYOUT 0x02 /* copy arguments out */
423 #define BC_F_SUSER 0x04 /* do super-user check */
425 const struct bridge_control bridge_control_table[] = {
426 { bridge_ioctl_add, sizeof(struct ifbreq),
427 BC_F_COPYIN|BC_F_SUSER },
428 { bridge_ioctl_del, sizeof(struct ifbreq),
429 BC_F_COPYIN|BC_F_SUSER },
431 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
432 BC_F_COPYIN|BC_F_COPYOUT },
433 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
434 BC_F_COPYIN|BC_F_SUSER },
436 { bridge_ioctl_scache, sizeof(struct ifbrparam),
437 BC_F_COPYIN|BC_F_SUSER },
438 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
441 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
442 BC_F_COPYIN|BC_F_COPYOUT },
443 { bridge_ioctl_rts, sizeof(struct ifbaconf),
444 BC_F_COPYIN|BC_F_COPYOUT },
446 { bridge_ioctl_saddr, sizeof(struct ifbareq),
447 BC_F_COPYIN|BC_F_SUSER },
449 { bridge_ioctl_sto, sizeof(struct ifbrparam),
450 BC_F_COPYIN|BC_F_SUSER },
451 { bridge_ioctl_gto, sizeof(struct ifbrparam),
454 { bridge_ioctl_daddr, sizeof(struct ifbareq),
455 BC_F_COPYIN|BC_F_SUSER },
457 { bridge_ioctl_flush, sizeof(struct ifbreq),
458 BC_F_COPYIN|BC_F_SUSER },
460 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
462 { bridge_ioctl_spri, sizeof(struct ifbrparam),
463 BC_F_COPYIN|BC_F_SUSER },
465 { bridge_ioctl_ght, sizeof(struct ifbrparam),
467 { bridge_ioctl_sht, sizeof(struct ifbrparam),
468 BC_F_COPYIN|BC_F_SUSER },
470 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
472 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
473 BC_F_COPYIN|BC_F_SUSER },
475 { bridge_ioctl_gma, sizeof(struct ifbrparam),
477 { bridge_ioctl_sma, sizeof(struct ifbrparam),
478 BC_F_COPYIN|BC_F_SUSER },
480 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
481 BC_F_COPYIN|BC_F_SUSER },
483 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
484 BC_F_COPYIN|BC_F_SUSER },
486 { bridge_ioctl_addspan, sizeof(struct ifbreq),
487 BC_F_COPYIN|BC_F_SUSER },
488 { bridge_ioctl_delspan, sizeof(struct ifbreq),
489 BC_F_COPYIN|BC_F_SUSER },
491 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
494 { bridge_ioctl_grte, sizeof(struct ifbrparam),
497 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
498 BC_F_COPYIN|BC_F_COPYOUT },
500 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
501 BC_F_COPYIN|BC_F_SUSER },
503 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
504 BC_F_COPYIN|BC_F_SUSER },
506 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
507 BC_F_COPYIN|BC_F_SUSER },
510 const int bridge_control_table_size = nitems(bridge_control_table);
512 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list);
513 #define V_bridge_list VNET(bridge_list)
514 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
515 "if_bridge list", NULL, MTX_DEF)
516 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
517 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
518 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
520 static VNET_DEFINE(struct if_clone *, bridge_cloner);
521 #define V_bridge_cloner VNET(bridge_cloner)
523 static const char bridge_name[] = "bridge";
526 vnet_bridge_init(const void *unused __unused)
529 BRIDGE_LIST_LOCK_INIT();
530 LIST_INIT(&V_bridge_list);
531 V_bridge_cloner = if_clone_simple(bridge_name,
532 bridge_clone_create, bridge_clone_destroy, 0);
534 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
535 vnet_bridge_init, NULL);
538 vnet_bridge_uninit(const void *unused __unused)
541 if_clone_detach(V_bridge_cloner);
542 V_bridge_cloner = NULL;
543 BRIDGE_LIST_LOCK_DESTROY();
545 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
546 vnet_bridge_uninit, NULL);
549 bridge_modevent(module_t mod, int type, void *data)
554 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
555 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
557 bridge_input_p = bridge_input;
558 bridge_output_p = bridge_output;
559 bridge_dn_p = bridge_dummynet;
560 bridge_linkstate_p = bridge_linkstate;
561 bridge_detach_cookie = EVENTHANDLER_REGISTER(
562 ifnet_departure_event, bridge_ifdetach, NULL,
563 EVENTHANDLER_PRI_ANY);
566 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
567 bridge_detach_cookie);
568 uma_zdestroy(bridge_rtnode_zone);
569 bridge_input_p = NULL;
570 bridge_output_p = NULL;
572 bridge_linkstate_p = NULL;
580 static moduledata_t bridge_mod = {
586 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
587 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
590 * handler for net.link.bridge.ipfw
593 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
595 int enable = V_pfil_ipfw;
598 error = sysctl_handle_int(oidp, &enable, 0, req);
601 if (enable != V_pfil_ipfw) {
602 V_pfil_ipfw = enable;
605 * Disable pfil so that ipfw doesnt run twice, if the user
606 * really wants both then they can re-enable pfil_bridge and/or
607 * pfil_member. Also allow non-ip packets as ipfw can filter by
619 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
620 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
621 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
622 "Layer2 filter with IPFW");
625 * bridge_clone_create:
627 * Create a new bridge instance.
630 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
632 struct bridge_softc *sc, *sc2;
633 struct ifnet *bifp, *ifp;
635 unsigned long hostid;
637 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
638 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
644 BRIDGE_LOCK_INIT(sc);
645 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
646 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
648 /* Initialize our routing table. */
649 bridge_rtable_init(sc);
651 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
653 LIST_INIT(&sc->sc_iflist);
654 LIST_INIT(&sc->sc_spanlist);
657 if_initname(ifp, bridge_name, unit);
658 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
659 ifp->if_ioctl = bridge_ioctl;
660 ifp->if_transmit = bridge_transmit;
661 ifp->if_qflush = bridge_qflush;
662 ifp->if_init = bridge_init;
663 ifp->if_type = IFT_BRIDGE;
666 * Generate an ethernet address with a locally administered address.
668 * Since we are using random ethernet addresses for the bridge, it is
669 * possible that we might have address collisions, so make sure that
670 * this hardware address isn't already in use on another bridge.
671 * The first try uses the hostid and falls back to arc4rand().
674 getcredhostid(curthread->td_ucred, &hostid);
676 if (fb || hostid == 0) {
677 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
678 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
679 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
681 sc->sc_defaddr[0] = 0x2;
682 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
683 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
684 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
685 sc->sc_defaddr[4] = hostid & 0xff;
686 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
692 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
694 if (memcmp(sc->sc_defaddr,
695 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
700 BRIDGE_LIST_UNLOCK();
701 } while (retry == 1);
703 bstp_attach(&sc->sc_stp, &bridge_ops);
704 ether_ifattach(ifp, sc->sc_defaddr);
705 /* Now undo some of the damage... */
706 ifp->if_baudrate = 0;
707 ifp->if_type = IFT_BRIDGE;
710 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
711 BRIDGE_LIST_UNLOCK();
717 * bridge_clone_destroy:
719 * Destroy a bridge instance.
722 bridge_clone_destroy(struct ifnet *ifp)
724 struct bridge_softc *sc = ifp->if_softc;
725 struct bridge_iflist *bif;
730 ifp->if_flags &= ~IFF_UP;
732 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
733 bridge_delete_member(sc, bif, 0);
735 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
736 bridge_delete_span(sc, bif);
741 callout_drain(&sc->sc_brcallout);
744 LIST_REMOVE(sc, sc_list);
745 BRIDGE_LIST_UNLOCK();
747 bstp_detach(&sc->sc_stp);
751 /* Tear down the routing table. */
752 bridge_rtable_fini(sc);
754 BRIDGE_LOCK_DESTROY(sc);
761 * Handle a control request from the operator.
764 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
766 struct bridge_softc *sc = ifp->if_softc;
767 struct ifreq *ifr = (struct ifreq *)data;
768 struct bridge_iflist *bif;
769 struct thread *td = curthread;
771 struct ifbreq ifbreq;
772 struct ifbifconf ifbifconf;
773 struct ifbareq ifbareq;
774 struct ifbaconf ifbaconf;
775 struct ifbrparam ifbrparam;
776 struct ifbropreq ifbropreq;
778 struct ifdrv *ifd = (struct ifdrv *) data;
779 const struct bridge_control *bc;
790 if (ifd->ifd_cmd >= bridge_control_table_size) {
794 bc = &bridge_control_table[ifd->ifd_cmd];
796 if (cmd == SIOCGDRVSPEC &&
797 (bc->bc_flags & BC_F_COPYOUT) == 0) {
801 else if (cmd == SIOCSDRVSPEC &&
802 (bc->bc_flags & BC_F_COPYOUT) != 0) {
807 if (bc->bc_flags & BC_F_SUSER) {
808 error = priv_check(td, PRIV_NET_BRIDGE);
813 if (ifd->ifd_len != bc->bc_argsize ||
814 ifd->ifd_len > sizeof(args)) {
819 bzero(&args, sizeof(args));
820 if (bc->bc_flags & BC_F_COPYIN) {
821 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
827 error = (*bc->bc_func)(sc, &args);
832 if (bc->bc_flags & BC_F_COPYOUT)
833 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
838 if (!(ifp->if_flags & IFF_UP) &&
839 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
841 * If interface is marked down and it is running,
842 * then stop and disable it.
847 } else if ((ifp->if_flags & IFF_UP) &&
848 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
850 * If interface is marked up and it is stopped, then
858 if (ifr->ifr_mtu < 576) {
862 if (LIST_EMPTY(&sc->sc_iflist)) {
863 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
867 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
868 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
869 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
870 " != %d\n", sc->sc_ifp->if_xname,
871 bif->bif_ifp->if_mtu,
872 bif->bif_ifp->if_xname, ifr->ifr_mtu);
878 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
883 * drop the lock as ether_ioctl() will call bridge_start() and
884 * cause the lock to be recursed.
886 error = ether_ioctl(ifp, cmd, data);
896 * Clear or restore unwanted capabilities on the member interface
899 bridge_mutecaps(struct bridge_softc *sc)
901 struct bridge_iflist *bif;
904 /* Initial bitmask of capabilities to test */
905 mask = BRIDGE_IFCAPS_MASK;
907 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
908 /* Every member must support it or its disabled */
909 mask &= bif->bif_savedcaps;
912 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
913 enabled = bif->bif_ifp->if_capenable;
914 enabled &= ~BRIDGE_IFCAPS_STRIP;
915 /* strip off mask bits and enable them again if allowed */
916 enabled &= ~BRIDGE_IFCAPS_MASK;
918 bridge_set_ifcap(sc, bif, enabled);
924 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
926 struct ifnet *ifp = bif->bif_ifp;
930 bzero(&ifr, sizeof(ifr));
931 ifr.ifr_reqcap = set;
933 if (ifp->if_capenable != set) {
934 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
936 if_printf(sc->sc_ifp,
937 "error setting interface capabilities on %s\n",
943 * bridge_lookup_member:
945 * Lookup a bridge member interface.
947 static struct bridge_iflist *
948 bridge_lookup_member(struct bridge_softc *sc, const char *name)
950 struct bridge_iflist *bif;
953 BRIDGE_LOCK_ASSERT(sc);
955 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
957 if (strcmp(ifp->if_xname, name) == 0)
965 * bridge_lookup_member_if:
967 * Lookup a bridge member interface by ifnet*.
969 static struct bridge_iflist *
970 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
972 struct bridge_iflist *bif;
974 BRIDGE_LOCK_ASSERT(sc);
976 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
977 if (bif->bif_ifp == member_ifp)
985 * bridge_delete_member:
987 * Delete the specified member interface.
990 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
993 struct ifnet *ifs = bif->bif_ifp;
994 struct ifnet *fif = NULL;
996 BRIDGE_LOCK_ASSERT(sc);
998 if (bif->bif_flags & IFBIF_STP)
999 bstp_disable(&bif->bif_stp);
1001 ifs->if_bridge = NULL;
1003 LIST_REMOVE(bif, bif_next);
1007 * If removing the interface that gave the bridge its mac address, set
1008 * the mac address of the bridge to the address of the next member, or
1009 * to its default address if no members are left.
1011 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1012 if (LIST_EMPTY(&sc->sc_iflist)) {
1013 bcopy(sc->sc_defaddr,
1014 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1015 sc->sc_ifaddr = NULL;
1017 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1018 bcopy(IF_LLADDR(fif),
1019 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1020 sc->sc_ifaddr = fif;
1022 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1025 bridge_linkcheck(sc);
1026 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1027 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1028 KASSERT(bif->bif_addrcnt == 0,
1029 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1033 switch (ifs->if_type) {
1037 * Take the interface out of promiscuous mode, but only
1038 * if it was promiscuous in the first place. It might
1039 * not be if we're in the bridge_ioctl_add() error path.
1041 if (ifs->if_flags & IFF_PROMISC)
1042 (void) ifpromisc(ifs, 0);
1050 panic("bridge_delete_member: impossible");
1054 /* reneable any interface capabilities */
1055 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1057 bstp_destroy(&bif->bif_stp); /* prepare to free */
1059 free(bif, M_DEVBUF);
1063 * bridge_delete_span:
1065 * Delete the specified span interface.
1068 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1070 BRIDGE_LOCK_ASSERT(sc);
1072 KASSERT(bif->bif_ifp->if_bridge == NULL,
1073 ("%s: not a span interface", __func__));
1075 LIST_REMOVE(bif, bif_next);
1076 free(bif, M_DEVBUF);
1080 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1082 struct ifbreq *req = arg;
1083 struct bridge_iflist *bif = NULL;
1087 ifs = ifunit(req->ifbr_ifsname);
1090 if (ifs->if_ioctl == NULL) /* must be supported */
1093 /* If it's in the span list, it can't be a member. */
1094 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1095 if (ifs == bif->bif_ifp)
1098 if (ifs->if_bridge == sc)
1101 if (ifs->if_bridge != NULL)
1104 switch (ifs->if_type) {
1108 /* permitted interface types */
1116 * Two valid inet6 addresses with link-local scope must not be
1117 * on the parent interface and the member interfaces at the
1118 * same time. This restriction is needed to prevent violation
1119 * of link-local scope zone. Attempts to add a member
1120 * interface which has inet6 addresses when the parent has
1121 * inet6 triggers removal of all inet6 addresses on the member
1125 /* Check if the parent interface has a link-local scope addr. */
1126 if (V_allow_llz_overlap == 0 &&
1127 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1129 * If any, remove all inet6 addresses from the member
1133 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1134 if (in6ifa_llaonifp(bif->bif_ifp)) {
1136 in6_ifdetach(bif->bif_ifp);
1138 if_printf(sc->sc_ifp,
1139 "IPv6 addresses on %s have been removed "
1140 "before adding it as a member to prevent "
1141 "IPv6 address scope violation.\n",
1142 bif->bif_ifp->if_xname);
1146 if (in6ifa_llaonifp(ifs)) {
1150 if_printf(sc->sc_ifp,
1151 "IPv6 addresses on %s have been removed "
1152 "before adding it as a member to prevent "
1153 "IPv6 address scope violation.\n",
1158 /* Allow the first Ethernet member to define the MTU */
1159 if (LIST_EMPTY(&sc->sc_iflist))
1160 sc->sc_ifp->if_mtu = ifs->if_mtu;
1161 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1162 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1163 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1167 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1172 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1173 bif->bif_savedcaps = ifs->if_capenable;
1176 * Assign the interface's MAC address to the bridge if it's the first
1177 * member and the MAC address of the bridge has not been changed from
1178 * the default randomly generated one.
1180 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1181 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1182 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1183 sc->sc_ifaddr = ifs;
1184 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1187 ifs->if_bridge = sc;
1188 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1190 * XXX: XLOCK HERE!?!
1192 * NOTE: insert_***HEAD*** should be safe for the traversals.
1194 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1196 /* Set interface capabilities to the intersection set of all members */
1197 bridge_mutecaps(sc);
1198 bridge_linkcheck(sc);
1200 /* Place the interface into promiscuous mode */
1201 switch (ifs->if_type) {
1205 error = ifpromisc(ifs, 1);
1211 bridge_delete_member(sc, bif, 0);
1216 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1218 struct ifbreq *req = arg;
1219 struct bridge_iflist *bif;
1221 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1225 bridge_delete_member(sc, bif, 0);
1231 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1233 struct ifbreq *req = arg;
1234 struct bridge_iflist *bif;
1235 struct bstp_port *bp;
1237 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1242 req->ifbr_ifsflags = bif->bif_flags;
1243 req->ifbr_state = bp->bp_state;
1244 req->ifbr_priority = bp->bp_priority;
1245 req->ifbr_path_cost = bp->bp_path_cost;
1246 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1247 req->ifbr_proto = bp->bp_protover;
1248 req->ifbr_role = bp->bp_role;
1249 req->ifbr_stpflags = bp->bp_flags;
1250 req->ifbr_addrcnt = bif->bif_addrcnt;
1251 req->ifbr_addrmax = bif->bif_addrmax;
1252 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1254 /* Copy STP state options as flags */
1255 if (bp->bp_operedge)
1256 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1257 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1258 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1259 if (bp->bp_ptp_link)
1260 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1261 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1262 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1263 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1264 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1265 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1266 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1271 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1273 struct ifbreq *req = arg;
1274 struct bridge_iflist *bif;
1275 struct bstp_port *bp;
1278 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1283 if (req->ifbr_ifsflags & IFBIF_SPAN)
1284 /* SPAN is readonly */
1287 if (req->ifbr_ifsflags & IFBIF_STP) {
1288 if ((bif->bif_flags & IFBIF_STP) == 0) {
1289 error = bstp_enable(&bif->bif_stp);
1294 if ((bif->bif_flags & IFBIF_STP) != 0)
1295 bstp_disable(&bif->bif_stp);
1298 /* Pass on STP flags */
1299 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1300 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1301 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1302 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1304 /* Save the bits relating to the bridge */
1305 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1311 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1313 struct ifbrparam *param = arg;
1315 sc->sc_brtmax = param->ifbrp_csize;
1322 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1324 struct ifbrparam *param = arg;
1326 param->ifbrp_csize = sc->sc_brtmax;
1332 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1334 struct ifbifconf *bifc = arg;
1335 struct bridge_iflist *bif;
1338 int count, buflen, len, error = 0;
1341 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1343 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1346 buflen = sizeof(breq) * count;
1347 if (bifc->ifbic_len == 0) {
1348 bifc->ifbic_len = buflen;
1352 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1357 len = min(bifc->ifbic_len, buflen);
1358 bzero(&breq, sizeof(breq));
1359 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1360 if (len < sizeof(breq))
1363 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1364 sizeof(breq.ifbr_ifsname));
1365 /* Fill in the ifbreq structure */
1366 error = bridge_ioctl_gifflags(sc, &breq);
1369 memcpy(buf, &breq, sizeof(breq));
1371 buf += sizeof(breq);
1372 len -= sizeof(breq);
1374 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1375 if (len < sizeof(breq))
1378 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1379 sizeof(breq.ifbr_ifsname));
1380 breq.ifbr_ifsflags = bif->bif_flags;
1381 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1382 memcpy(buf, &breq, sizeof(breq));
1384 buf += sizeof(breq);
1385 len -= sizeof(breq);
1389 bifc->ifbic_len = sizeof(breq) * count;
1390 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1392 free(outbuf, M_TEMP);
1397 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1399 struct ifbaconf *bac = arg;
1400 struct bridge_rtnode *brt;
1401 struct ifbareq bareq;
1403 int count, buflen, len, error = 0;
1405 if (bac->ifbac_len == 0)
1409 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1411 buflen = sizeof(bareq) * count;
1414 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1419 len = min(bac->ifbac_len, buflen);
1420 bzero(&bareq, sizeof(bareq));
1421 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1422 if (len < sizeof(bareq))
1424 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1425 sizeof(bareq.ifba_ifsname));
1426 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1427 bareq.ifba_vlan = brt->brt_vlan;
1428 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1429 time_uptime < brt->brt_expire)
1430 bareq.ifba_expire = brt->brt_expire - time_uptime;
1432 bareq.ifba_expire = 0;
1433 bareq.ifba_flags = brt->brt_flags;
1435 memcpy(buf, &bareq, sizeof(bareq));
1437 buf += sizeof(bareq);
1438 len -= sizeof(bareq);
1442 bac->ifbac_len = sizeof(bareq) * count;
1443 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1445 free(outbuf, M_TEMP);
1450 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1452 struct ifbareq *req = arg;
1453 struct bridge_iflist *bif;
1456 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1460 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1467 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1469 struct ifbrparam *param = arg;
1471 sc->sc_brttimeout = param->ifbrp_ctime;
1476 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1478 struct ifbrparam *param = arg;
1480 param->ifbrp_ctime = sc->sc_brttimeout;
1485 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1487 struct ifbareq *req = arg;
1489 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1493 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1495 struct ifbreq *req = arg;
1497 bridge_rtflush(sc, req->ifbr_ifsflags);
1502 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1504 struct ifbrparam *param = arg;
1505 struct bstp_state *bs = &sc->sc_stp;
1507 param->ifbrp_prio = bs->bs_bridge_priority;
1512 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1514 struct ifbrparam *param = arg;
1516 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1520 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1522 struct ifbrparam *param = arg;
1523 struct bstp_state *bs = &sc->sc_stp;
1525 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1530 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1532 struct ifbrparam *param = arg;
1534 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1538 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1540 struct ifbrparam *param = arg;
1541 struct bstp_state *bs = &sc->sc_stp;
1543 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1548 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1550 struct ifbrparam *param = arg;
1552 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1556 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1558 struct ifbrparam *param = arg;
1559 struct bstp_state *bs = &sc->sc_stp;
1561 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1566 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1568 struct ifbrparam *param = arg;
1570 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1574 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1576 struct ifbreq *req = arg;
1577 struct bridge_iflist *bif;
1579 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1583 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1587 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1589 struct ifbreq *req = arg;
1590 struct bridge_iflist *bif;
1592 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1596 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1600 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1602 struct ifbreq *req = arg;
1603 struct bridge_iflist *bif;
1605 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1609 bif->bif_addrmax = req->ifbr_addrmax;
1614 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1616 struct ifbreq *req = arg;
1617 struct bridge_iflist *bif = NULL;
1620 ifs = ifunit(req->ifbr_ifsname);
1624 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1625 if (ifs == bif->bif_ifp)
1628 if (ifs->if_bridge != NULL)
1631 switch (ifs->if_type) {
1640 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1645 bif->bif_flags = IFBIF_SPAN;
1647 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1653 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1655 struct ifbreq *req = arg;
1656 struct bridge_iflist *bif;
1659 ifs = ifunit(req->ifbr_ifsname);
1663 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1664 if (ifs == bif->bif_ifp)
1670 bridge_delete_span(sc, bif);
1676 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1678 struct ifbropreq *req = arg;
1679 struct bstp_state *bs = &sc->sc_stp;
1680 struct bstp_port *root_port;
1682 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1683 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1684 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1686 root_port = bs->bs_root_port;
1687 if (root_port == NULL)
1688 req->ifbop_root_port = 0;
1690 req->ifbop_root_port = root_port->bp_ifp->if_index;
1692 req->ifbop_holdcount = bs->bs_txholdcount;
1693 req->ifbop_priority = bs->bs_bridge_priority;
1694 req->ifbop_protocol = bs->bs_protover;
1695 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1696 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1697 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1698 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1699 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1700 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1706 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1708 struct ifbrparam *param = arg;
1710 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1715 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1717 struct ifbpstpconf *bifstp = arg;
1718 struct bridge_iflist *bif;
1719 struct bstp_port *bp;
1720 struct ifbpstpreq bpreq;
1722 int count, buflen, len, error = 0;
1725 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1726 if ((bif->bif_flags & IFBIF_STP) != 0)
1730 buflen = sizeof(bpreq) * count;
1731 if (bifstp->ifbpstp_len == 0) {
1732 bifstp->ifbpstp_len = buflen;
1737 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1742 len = min(bifstp->ifbpstp_len, buflen);
1743 bzero(&bpreq, sizeof(bpreq));
1744 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1745 if (len < sizeof(bpreq))
1748 if ((bif->bif_flags & IFBIF_STP) == 0)
1752 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1753 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1754 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1755 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1756 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1757 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1759 memcpy(buf, &bpreq, sizeof(bpreq));
1761 buf += sizeof(bpreq);
1762 len -= sizeof(bpreq);
1766 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1767 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1769 free(outbuf, M_TEMP);
1774 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1776 struct ifbrparam *param = arg;
1778 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1782 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1784 struct ifbrparam *param = arg;
1786 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1792 * Detach an interface from a bridge. Called when a member
1793 * interface is detaching.
1796 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1798 struct bridge_softc *sc = ifp->if_bridge;
1799 struct bridge_iflist *bif;
1801 if (ifp->if_flags & IFF_RENAMING)
1803 if (V_bridge_cloner == NULL) {
1805 * This detach handler can be called after
1806 * vnet_bridge_uninit(). Just return in that case.
1810 /* Check if the interface is a bridge member */
1814 bif = bridge_lookup_member_if(sc, ifp);
1816 bridge_delete_member(sc, bif, 1);
1822 /* Check if the interface is a span port */
1824 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1826 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1827 if (ifp == bif->bif_ifp) {
1828 bridge_delete_span(sc, bif);
1834 BRIDGE_LIST_UNLOCK();
1840 * Initialize a bridge interface.
1843 bridge_init(void *xsc)
1845 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1846 struct ifnet *ifp = sc->sc_ifp;
1848 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1852 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1855 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1856 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1864 * Stop the bridge interface.
1867 bridge_stop(struct ifnet *ifp, int disable)
1869 struct bridge_softc *sc = ifp->if_softc;
1871 BRIDGE_LOCK_ASSERT(sc);
1873 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1876 callout_stop(&sc->sc_brcallout);
1877 bstp_stop(&sc->sc_stp);
1879 bridge_rtflush(sc, IFBF_FLUSHDYN);
1881 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1887 * Enqueue a packet on a bridge member interface.
1891 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1897 /* We may be sending a fragment so traverse the mbuf */
1900 m->m_nextpkt = NULL;
1901 len = m->m_pkthdr.len;
1902 mflags = m->m_flags;
1905 * If underlying interface can not do VLAN tag insertion itself
1906 * then attach a packet tag that holds it.
1908 if ((m->m_flags & M_VLANTAG) &&
1909 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1910 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1913 "unable to prepend VLAN header\n");
1914 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1917 m->m_flags &= ~M_VLANTAG;
1920 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1921 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1923 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1927 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1928 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1929 if (mflags & M_MCAST)
1930 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1939 * Receive a queued packet from dummynet and pass it on to the output
1942 * The mbuf has the Ethernet header already attached.
1945 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1947 struct bridge_softc *sc;
1949 sc = ifp->if_bridge;
1952 * The packet didnt originate from a member interface. This should only
1953 * ever happen if a member interface is removed while packets are
1961 if (PFIL_HOOKED(&V_inet_pfil_hook)
1963 || PFIL_HOOKED(&V_inet6_pfil_hook)
1966 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1972 bridge_enqueue(sc, ifp, m);
1978 * Send output from a bridge member interface. This
1979 * performs the bridging function for locally originated
1982 * The mbuf has the Ethernet header already attached. We must
1983 * enqueue or free the mbuf before returning.
1986 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1989 struct ether_header *eh;
1990 struct ifnet *dst_if;
1991 struct bridge_softc *sc;
1994 if (m->m_len < ETHER_HDR_LEN) {
1995 m = m_pullup(m, ETHER_HDR_LEN);
2000 eh = mtod(m, struct ether_header *);
2001 sc = ifp->if_bridge;
2002 vlan = VLANTAGOF(m);
2007 * If bridge is down, but the original output interface is up,
2008 * go ahead and send out that interface. Otherwise, the packet
2011 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2017 * If the packet is a multicast, or we don't know a better way to
2018 * get there, send to all interfaces.
2020 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2023 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2024 if (dst_if == NULL) {
2025 struct bridge_iflist *bif;
2027 int error = 0, used = 0;
2031 BRIDGE_LOCK2REF(sc, error);
2037 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2038 dst_if = bif->bif_ifp;
2040 if (dst_if->if_type == IFT_GIF)
2042 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2046 * If this is not the original output interface,
2047 * and the interface is participating in spanning
2048 * tree, make sure the port is in a state that
2049 * allows forwarding.
2051 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2052 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2055 if (LIST_NEXT(bif, bif_next) == NULL) {
2059 mc = m_copypacket(m, M_NOWAIT);
2061 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2066 bridge_enqueue(sc, dst_if, mc);
2076 * XXX Spanning tree consideration here?
2080 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2087 bridge_enqueue(sc, dst_if, m);
2094 * Do output on a bridge.
2098 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2100 struct bridge_softc *sc;
2101 struct ether_header *eh;
2102 struct ifnet *dst_if;
2107 ETHER_BPF_MTAP(ifp, m);
2109 eh = mtod(m, struct ether_header *);
2112 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2113 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2115 error = bridge_enqueue(sc, dst_if, m);
2117 bridge_broadcast(sc, ifp, m, 0);
2123 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2126 bridge_qflush(struct ifnet *ifp __unused)
2133 * The forwarding function of the bridge.
2135 * NOTE: Releases the lock on return.
2138 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2141 struct bridge_iflist *dbif;
2142 struct ifnet *src_if, *dst_if, *ifp;
2143 struct ether_header *eh;
2148 src_if = m->m_pkthdr.rcvif;
2151 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2152 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2153 vlan = VLANTAGOF(m);
2155 if ((sbif->bif_flags & IFBIF_STP) &&
2156 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2159 eh = mtod(m, struct ether_header *);
2160 dst = eh->ether_dhost;
2162 /* If the interface is learning, record the address. */
2163 if (sbif->bif_flags & IFBIF_LEARNING) {
2164 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2165 sbif, 0, IFBAF_DYNAMIC);
2167 * If the interface has addresses limits then deny any source
2168 * that is not in the cache.
2170 if (error && sbif->bif_addrmax)
2174 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2175 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2179 * At this point, the port either doesn't participate
2180 * in spanning tree or it is in the forwarding state.
2184 * If the packet is unicast, destined for someone on
2185 * "this" side of the bridge, drop it.
2187 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2188 dst_if = bridge_rtlookup(sc, dst, vlan);
2189 if (src_if == dst_if)
2193 * Check if its a reserved multicast address, any address
2194 * listed in 802.1D section 7.12.6 may not be forwarded by the
2196 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2198 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2199 dst[2] == 0xc2 && dst[3] == 0x00 &&
2200 dst[4] == 0x00 && dst[5] <= 0x0f)
2203 /* ...forward it to all interfaces. */
2204 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2209 * If we have a destination interface which is a member of our bridge,
2210 * OR this is a unicast packet, push it through the bpf(4) machinery.
2211 * For broadcast or multicast packets, don't bother because it will
2212 * be reinjected into ether_input. We do this before we pass the packets
2213 * through the pfil(9) framework, as it is possible that pfil(9) will
2214 * drop the packet, or possibly modify it, making it difficult to debug
2215 * firewall issues on the bridge.
2217 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2218 ETHER_BPF_MTAP(ifp, m);
2220 /* run the packet filter */
2221 if (PFIL_HOOKED(&V_inet_pfil_hook)
2223 || PFIL_HOOKED(&V_inet6_pfil_hook)
2227 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2234 if (dst_if == NULL) {
2235 bridge_broadcast(sc, src_if, m, 1);
2240 * At this point, we're dealing with a unicast frame
2241 * going to a different interface.
2243 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2246 dbif = bridge_lookup_member_if(sc, dst_if);
2248 /* Not a member of the bridge (anymore?) */
2251 /* Private segments can not talk to each other */
2252 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2255 if ((dbif->bif_flags & IFBIF_STP) &&
2256 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2261 if (PFIL_HOOKED(&V_inet_pfil_hook)
2263 || PFIL_HOOKED(&V_inet6_pfil_hook)
2266 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2272 bridge_enqueue(sc, dst_if, m);
2283 * Receive input from a member interface. Queue the packet for
2284 * bridging if it is not for us.
2286 static struct mbuf *
2287 bridge_input(struct ifnet *ifp, struct mbuf *m)
2289 struct bridge_softc *sc = ifp->if_bridge;
2290 struct bridge_iflist *bif, *bif2;
2292 struct ether_header *eh;
2293 struct mbuf *mc, *mc2;
2297 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2301 vlan = VLANTAGOF(m);
2304 * Implement support for bridge monitoring. If this flag has been
2305 * set on this interface, discard the packet once we push it through
2306 * the bpf(4) machinery, but before we do, increment the byte and
2307 * packet counters associated with this interface.
2309 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2310 m->m_pkthdr.rcvif = bifp;
2311 ETHER_BPF_MTAP(bifp, m);
2312 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2313 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2318 bif = bridge_lookup_member_if(sc, ifp);
2324 eh = mtod(m, struct ether_header *);
2328 if (m->m_flags & (M_BCAST|M_MCAST)) {
2329 /* Tap off 802.1D packets; they do not get forwarded. */
2330 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2331 ETHER_ADDR_LEN) == 0) {
2332 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2337 if ((bif->bif_flags & IFBIF_STP) &&
2338 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2344 * Make a deep copy of the packet and enqueue the copy
2345 * for bridge processing; return the original packet for
2348 mc = m_dup(m, M_NOWAIT);
2354 /* Perform the bridge forwarding function with the copy. */
2355 bridge_forward(sc, bif, mc);
2358 * Reinject the mbuf as arriving on the bridge so we have a
2359 * chance at claiming multicast packets. We can not loop back
2360 * here from ether_input as a bridge is never a member of a
2363 KASSERT(bifp->if_bridge == NULL,
2364 ("loop created in bridge_input"));
2365 mc2 = m_dup(m, M_NOWAIT);
2367 /* Keep the layer3 header aligned */
2368 int i = min(mc2->m_pkthdr.len, max_protohdr);
2369 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2372 mc2->m_pkthdr.rcvif = bifp;
2373 (*bifp->if_input)(bifp, mc2);
2376 /* Return the original packet for local processing. */
2380 if ((bif->bif_flags & IFBIF_STP) &&
2381 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2386 #if (defined(INET) || defined(INET6))
2387 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2388 || ((iface)->if_carp \
2389 && (*carp_forus_p)((iface), eh->ether_dhost))
2390 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2391 || ((iface)->if_carp \
2392 && (*carp_forus_p)((iface), eh->ether_shost))
2394 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2395 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2399 # define OR_PFIL_HOOKED_INET6 \
2400 || PFIL_HOOKED(&V_inet6_pfil_hook)
2402 # define OR_PFIL_HOOKED_INET6
2405 #define GRAB_OUR_PACKETS(iface) \
2406 if ((iface)->if_type == IFT_GIF) \
2408 /* It is destined for us. */ \
2409 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2410 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2412 if ((iface)->if_type == IFT_BRIDGE) { \
2413 ETHER_BPF_MTAP(iface, m); \
2414 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \
2415 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2416 /* Filter on the physical interface. */ \
2417 if (V_pfil_local_phys && \
2418 (PFIL_HOOKED(&V_inet_pfil_hook) \
2419 OR_PFIL_HOOKED_INET6)) { \
2420 if (bridge_pfil(&m, NULL, ifp, \
2421 PFIL_IN) != 0 || m == NULL) { \
2422 BRIDGE_UNLOCK(sc); \
2425 eh = mtod(m, struct ether_header *); \
2428 if (bif->bif_flags & IFBIF_LEARNING) { \
2429 error = bridge_rtupdate(sc, eh->ether_shost, \
2430 vlan, bif, 0, IFBAF_DYNAMIC); \
2431 if (error && bif->bif_addrmax) { \
2432 BRIDGE_UNLOCK(sc); \
2437 m->m_pkthdr.rcvif = iface; \
2438 BRIDGE_UNLOCK(sc); \
2442 /* We just received a packet that we sent out. */ \
2443 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2444 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2446 BRIDGE_UNLOCK(sc); \
2452 * Unicast. Make sure it's not for the bridge.
2454 do { GRAB_OUR_PACKETS(bifp) } while (0);
2457 * Give a chance for ifp at first priority. This will help when the
2458 * packet comes through the interface like VLAN's with the same MACs
2459 * on several interfaces from the same bridge. This also will save
2460 * some CPU cycles in case the destination interface and the input
2461 * interface (eq ifp) are the same.
2463 do { GRAB_OUR_PACKETS(ifp) } while (0);
2465 /* Now check the all bridge members. */
2466 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2467 GRAB_OUR_PACKETS(bif2->bif_ifp)
2470 #undef OR_CARP_CHECK_WE_ARE_DST
2471 #undef OR_CARP_CHECK_WE_ARE_SRC
2472 #undef OR_PFIL_HOOKED_INET6
2473 #undef GRAB_OUR_PACKETS
2475 /* Perform the bridge forwarding function. */
2476 bridge_forward(sc, bif, m);
2484 * Send a frame to all interfaces that are members of
2485 * the bridge, except for the one on which the packet
2488 * NOTE: Releases the lock on return.
2491 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2492 struct mbuf *m, int runfilt)
2494 struct bridge_iflist *dbif, *sbif;
2496 struct ifnet *dst_if;
2497 int error = 0, used = 0, i;
2499 sbif = bridge_lookup_member_if(sc, src_if);
2501 BRIDGE_LOCK2REF(sc, error);
2507 /* Filter on the bridge interface before broadcasting */
2508 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2510 || PFIL_HOOKED(&V_inet6_pfil_hook)
2513 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2519 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2520 dst_if = dbif->bif_ifp;
2521 if (dst_if == src_if)
2524 /* Private segments can not talk to each other */
2525 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2528 if ((dbif->bif_flags & IFBIF_STP) &&
2529 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2532 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2533 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2536 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2539 if (LIST_NEXT(dbif, bif_next) == NULL) {
2543 mc = m_dup(m, M_NOWAIT);
2545 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2551 * Filter on the output interface. Pass a NULL bridge interface
2552 * pointer so we do not redundantly filter on the bridge for
2553 * each interface we broadcast on.
2555 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2557 || PFIL_HOOKED(&V_inet6_pfil_hook)
2561 /* Keep the layer3 header aligned */
2562 i = min(mc->m_pkthdr.len, max_protohdr);
2563 mc = m_copyup(mc, i, ETHER_ALIGN);
2565 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2569 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2575 bridge_enqueue(sc, dst_if, mc);
2587 * Duplicate a packet out one or more interfaces that are in span mode,
2588 * the original mbuf is unmodified.
2591 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2593 struct bridge_iflist *bif;
2594 struct ifnet *dst_if;
2597 if (LIST_EMPTY(&sc->sc_spanlist))
2600 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2601 dst_if = bif->bif_ifp;
2603 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2606 mc = m_copypacket(m, M_NOWAIT);
2608 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2612 bridge_enqueue(sc, dst_if, mc);
2619 * Add a bridge routing entry.
2622 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2623 struct bridge_iflist *bif, int setflags, uint8_t flags)
2625 struct bridge_rtnode *brt;
2628 BRIDGE_LOCK_ASSERT(sc);
2630 /* Check the source address is valid and not multicast. */
2631 if (ETHER_IS_MULTICAST(dst) ||
2632 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2633 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2636 /* 802.1p frames map to vlan 1 */
2641 * A route for this destination might already exist. If so,
2642 * update it, otherwise create a new one.
2644 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2645 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2646 sc->sc_brtexceeded++;
2649 /* Check per interface address limits (if enabled) */
2650 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2651 bif->bif_addrexceeded++;
2656 * Allocate a new bridge forwarding node, and
2657 * initialize the expiration time and Ethernet
2660 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2664 if (bif->bif_flags & IFBIF_STICKY)
2665 brt->brt_flags = IFBAF_STICKY;
2667 brt->brt_flags = IFBAF_DYNAMIC;
2669 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2670 brt->brt_vlan = vlan;
2672 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2673 uma_zfree(bridge_rtnode_zone, brt);
2680 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2681 brt->brt_dst != bif) {
2682 brt->brt_dst->bif_addrcnt--;
2684 brt->brt_dst->bif_addrcnt++;
2687 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2688 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2690 brt->brt_flags = flags;
2698 * Lookup the destination interface for an address.
2700 static struct ifnet *
2701 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2703 struct bridge_rtnode *brt;
2705 BRIDGE_LOCK_ASSERT(sc);
2707 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2710 return (brt->brt_ifp);
2716 * Trim the routine table so that we have a number
2717 * of routing entries less than or equal to the
2721 bridge_rttrim(struct bridge_softc *sc)
2723 struct bridge_rtnode *brt, *nbrt;
2725 BRIDGE_LOCK_ASSERT(sc);
2727 /* Make sure we actually need to do this. */
2728 if (sc->sc_brtcnt <= sc->sc_brtmax)
2731 /* Force an aging cycle; this might trim enough addresses. */
2733 if (sc->sc_brtcnt <= sc->sc_brtmax)
2736 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2737 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2738 bridge_rtnode_destroy(sc, brt);
2739 if (sc->sc_brtcnt <= sc->sc_brtmax)
2748 * Aging timer for the bridge.
2751 bridge_timer(void *arg)
2753 struct bridge_softc *sc = arg;
2755 BRIDGE_LOCK_ASSERT(sc);
2759 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2760 callout_reset(&sc->sc_brcallout,
2761 bridge_rtable_prune_period * hz, bridge_timer, sc);
2767 * Perform an aging cycle.
2770 bridge_rtage(struct bridge_softc *sc)
2772 struct bridge_rtnode *brt, *nbrt;
2774 BRIDGE_LOCK_ASSERT(sc);
2776 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2777 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2778 if (time_uptime >= brt->brt_expire)
2779 bridge_rtnode_destroy(sc, brt);
2787 * Remove all dynamic addresses from the bridge.
2790 bridge_rtflush(struct bridge_softc *sc, int full)
2792 struct bridge_rtnode *brt, *nbrt;
2794 BRIDGE_LOCK_ASSERT(sc);
2796 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2797 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2798 bridge_rtnode_destroy(sc, brt);
2805 * Remove an address from the table.
2808 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2810 struct bridge_rtnode *brt;
2813 BRIDGE_LOCK_ASSERT(sc);
2816 * If vlan is zero then we want to delete for all vlans so the lookup
2817 * may return more than one.
2819 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2820 bridge_rtnode_destroy(sc, brt);
2824 return (found ? 0 : ENOENT);
2830 * Delete routes to a speicifc member interface.
2833 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2835 struct bridge_rtnode *brt, *nbrt;
2837 BRIDGE_LOCK_ASSERT(sc);
2839 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2840 if (brt->brt_ifp == ifp && (full ||
2841 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2842 bridge_rtnode_destroy(sc, brt);
2847 * bridge_rtable_init:
2849 * Initialize the route table for this bridge.
2852 bridge_rtable_init(struct bridge_softc *sc)
2856 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2857 M_DEVBUF, M_WAITOK);
2859 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2860 LIST_INIT(&sc->sc_rthash[i]);
2862 sc->sc_rthash_key = arc4random();
2863 LIST_INIT(&sc->sc_rtlist);
2867 * bridge_rtable_fini:
2869 * Deconstruct the route table for this bridge.
2872 bridge_rtable_fini(struct bridge_softc *sc)
2875 KASSERT(sc->sc_brtcnt == 0,
2876 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2877 free(sc->sc_rthash, M_DEVBUF);
2881 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2882 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2884 #define mix(a, b, c) \
2886 a -= b; a -= c; a ^= (c >> 13); \
2887 b -= c; b -= a; b ^= (a << 8); \
2888 c -= a; c -= b; c ^= (b >> 13); \
2889 a -= b; a -= c; a ^= (c >> 12); \
2890 b -= c; b -= a; b ^= (a << 16); \
2891 c -= a; c -= b; c ^= (b >> 5); \
2892 a -= b; a -= c; a ^= (c >> 3); \
2893 b -= c; b -= a; b ^= (a << 10); \
2894 c -= a; c -= b; c ^= (b >> 15); \
2895 } while (/*CONSTCOND*/0)
2897 static __inline uint32_t
2898 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2900 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2911 return (c & BRIDGE_RTHASH_MASK);
2917 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2921 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2922 d = ((int)a[i]) - ((int)b[i]);
2929 * bridge_rtnode_lookup:
2931 * Look up a bridge route node for the specified destination. Compare the
2932 * vlan id or if zero then just return the first match.
2934 static struct bridge_rtnode *
2935 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2937 struct bridge_rtnode *brt;
2941 BRIDGE_LOCK_ASSERT(sc);
2943 hash = bridge_rthash(sc, addr);
2944 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2945 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2946 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2956 * bridge_rtnode_insert:
2958 * Insert the specified bridge node into the route table. We
2959 * assume the entry is not already in the table.
2962 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2964 struct bridge_rtnode *lbrt;
2968 BRIDGE_LOCK_ASSERT(sc);
2970 hash = bridge_rthash(sc, brt->brt_addr);
2972 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2974 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2979 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2980 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2983 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2986 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2987 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2990 lbrt = LIST_NEXT(lbrt, brt_hash);
2991 } while (lbrt != NULL);
2994 panic("bridge_rtnode_insert: impossible");
2998 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3005 * bridge_rtnode_destroy:
3007 * Destroy a bridge rtnode.
3010 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3012 BRIDGE_LOCK_ASSERT(sc);
3014 LIST_REMOVE(brt, brt_hash);
3016 LIST_REMOVE(brt, brt_list);
3018 brt->brt_dst->bif_addrcnt--;
3019 uma_zfree(bridge_rtnode_zone, brt);
3023 * bridge_rtable_expire:
3025 * Set the expiry time for all routes on an interface.
3028 bridge_rtable_expire(struct ifnet *ifp, int age)
3030 struct bridge_softc *sc = ifp->if_bridge;
3031 struct bridge_rtnode *brt;
3036 * If the age is zero then flush, otherwise set all the expiry times to
3037 * age for the interface
3040 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3042 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3043 /* Cap the expiry time to 'age' */
3044 if (brt->brt_ifp == ifp &&
3045 brt->brt_expire > time_uptime + age &&
3046 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3047 brt->brt_expire = time_uptime + age;
3054 * bridge_state_change:
3056 * Callback from the bridgestp code when a port changes states.
3059 bridge_state_change(struct ifnet *ifp, int state)
3061 struct bridge_softc *sc = ifp->if_bridge;
3062 static const char *stpstates[] = {
3071 CURVNET_SET(ifp->if_vnet);
3073 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3074 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3079 * Send bridge packets through pfil if they are one of the types pfil can deal
3080 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3081 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3085 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3087 int snap, error, i, hlen;
3088 struct ether_header *eh1, eh2;
3091 u_int16_t ether_type;
3094 error = -1; /* Default error if not error == 0 */
3097 /* we may return with the IP fields swapped, ensure its not shared */
3098 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3101 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3102 return (0); /* filtering is disabled */
3104 i = min((*mp)->m_pkthdr.len, max_protohdr);
3105 if ((*mp)->m_len < i) {
3106 *mp = m_pullup(*mp, i);
3108 printf("%s: m_pullup failed\n", __func__);
3113 eh1 = mtod(*mp, struct ether_header *);
3114 ether_type = ntohs(eh1->ether_type);
3117 * Check for SNAP/LLC.
3119 if (ether_type < ETHERMTU) {
3120 struct llc *llc2 = (struct llc *)(eh1 + 1);
3122 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3123 llc2->llc_dsap == LLC_SNAP_LSAP &&
3124 llc2->llc_ssap == LLC_SNAP_LSAP &&
3125 llc2->llc_control == LLC_UI) {
3126 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3132 * If we're trying to filter bridge traffic, don't look at anything
3133 * other than IP and ARP traffic. If the filter doesn't understand
3134 * IPv6, don't allow IPv6 through the bridge either. This is lame
3135 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3136 * but of course we don't have an AppleTalk filter to begin with.
3137 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3140 switch (ether_type) {
3142 case ETHERTYPE_REVARP:
3143 if (V_pfil_ipfw_arp == 0)
3144 return (0); /* Automatically pass */
3149 case ETHERTYPE_IPV6:
3154 * Check to see if the user wants to pass non-ip
3155 * packets, these will not be checked by pfil(9) and
3156 * passed unconditionally so the default is to drop.
3162 /* Run the packet through pfil before stripping link headers */
3163 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
3164 dir == PFIL_OUT && ifp != NULL) {
3166 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3168 if (*mp == NULL || error != 0) /* packet consumed by filter */
3172 /* Strip off the Ethernet header and keep a copy. */
3173 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3174 m_adj(*mp, ETHER_HDR_LEN);
3176 /* Strip off snap header, if present */
3178 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3179 m_adj(*mp, sizeof(struct llc));
3183 * Check the IP header for alignment and errors
3185 if (dir == PFIL_IN) {
3186 switch (ether_type) {
3188 error = bridge_ip_checkbasic(mp);
3191 case ETHERTYPE_IPV6:
3192 error = bridge_ip6_checkbasic(mp);
3205 * Run the packet through pfil
3207 switch (ether_type) {
3210 * Run pfil on the member interface and the bridge, both can
3211 * be skipped by clearing pfil_member or pfil_bridge.
3214 * in_if -> bridge_if -> out_if
3216 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3217 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3220 if (*mp == NULL || error != 0) /* filter may consume */
3223 if (V_pfil_member && ifp != NULL)
3224 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3227 if (*mp == NULL || error != 0) /* filter may consume */
3230 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3231 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3234 if (*mp == NULL || error != 0) /* filter may consume */
3237 /* check if we need to fragment the packet */
3238 /* bridge_fragment generates a mbuf chain of packets */
3239 /* that already include eth headers */
3240 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3241 i = (*mp)->m_pkthdr.len;
3242 if (i > ifp->if_mtu) {
3243 error = bridge_fragment(ifp, mp, &eh2, snap,
3249 /* Recalculate the ip checksum. */
3250 ip = mtod(*mp, struct ip *);
3251 hlen = ip->ip_hl << 2;
3252 if (hlen < sizeof(struct ip))
3254 if (hlen > (*mp)->m_len) {
3255 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3257 ip = mtod(*mp, struct ip *);
3262 if (hlen == sizeof(struct ip))
3263 ip->ip_sum = in_cksum_hdr(ip);
3265 ip->ip_sum = in_cksum(*mp, hlen);
3269 case ETHERTYPE_IPV6:
3270 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3271 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3274 if (*mp == NULL || error != 0) /* filter may consume */
3277 if (V_pfil_member && ifp != NULL)
3278 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3281 if (*mp == NULL || error != 0) /* filter may consume */
3284 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3285 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3302 * Finally, put everything back the way it was and return
3305 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3308 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3311 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3314 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3325 * Perform basic checks on header size since
3326 * pfil assumes ip_input has already processed
3327 * it for it. Cut-and-pasted from ip_input.c.
3328 * Given how simple the IPv6 version is,
3329 * does the IPv4 version really need to be
3332 * XXX Should we update ipstat here, or not?
3333 * XXX Right now we update ipstat but not
3337 bridge_ip_checkbasic(struct mbuf **mp)
3339 struct mbuf *m = *mp;
3347 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3348 if ((m = m_copyup(m, sizeof(struct ip),
3349 (max_linkhdr + 3) & ~3)) == NULL) {
3350 /* XXXJRT new stat, please */
3351 KMOD_IPSTAT_INC(ips_toosmall);
3354 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3355 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3356 KMOD_IPSTAT_INC(ips_toosmall);
3360 ip = mtod(m, struct ip *);
3361 if (ip == NULL) goto bad;
3363 if (ip->ip_v != IPVERSION) {
3364 KMOD_IPSTAT_INC(ips_badvers);
3367 hlen = ip->ip_hl << 2;
3368 if (hlen < sizeof(struct ip)) { /* minimum header length */
3369 KMOD_IPSTAT_INC(ips_badhlen);
3372 if (hlen > m->m_len) {
3373 if ((m = m_pullup(m, hlen)) == NULL) {
3374 KMOD_IPSTAT_INC(ips_badhlen);
3377 ip = mtod(m, struct ip *);
3378 if (ip == NULL) goto bad;
3381 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3382 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3384 if (hlen == sizeof(struct ip)) {
3385 sum = in_cksum_hdr(ip);
3387 sum = in_cksum(m, hlen);
3391 KMOD_IPSTAT_INC(ips_badsum);
3395 /* Retrieve the packet length. */
3396 len = ntohs(ip->ip_len);
3399 * Check for additional length bogosity
3402 KMOD_IPSTAT_INC(ips_badlen);
3407 * Check that the amount of data in the buffers
3408 * is as at least much as the IP header would have us expect.
3409 * Drop packet if shorter than we expect.
3411 if (m->m_pkthdr.len < len) {
3412 KMOD_IPSTAT_INC(ips_tooshort);
3416 /* Checks out, proceed */
3427 * Same as above, but for IPv6.
3428 * Cut-and-pasted from ip6_input.c.
3429 * XXX Should we update ip6stat, or not?
3432 bridge_ip6_checkbasic(struct mbuf **mp)
3434 struct mbuf *m = *mp;
3435 struct ip6_hdr *ip6;
3438 * If the IPv6 header is not aligned, slurp it up into a new
3439 * mbuf with space for link headers, in the event we forward
3440 * it. Otherwise, if it is aligned, make sure the entire base
3441 * IPv6 header is in the first mbuf of the chain.
3443 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3444 struct ifnet *inifp = m->m_pkthdr.rcvif;
3445 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3446 (max_linkhdr + 3) & ~3)) == NULL) {
3447 /* XXXJRT new stat, please */
3448 IP6STAT_INC(ip6s_toosmall);
3449 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3452 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3453 struct ifnet *inifp = m->m_pkthdr.rcvif;
3454 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3455 IP6STAT_INC(ip6s_toosmall);
3456 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3461 ip6 = mtod(m, struct ip6_hdr *);
3463 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3464 IP6STAT_INC(ip6s_badvers);
3465 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3469 /* Checks out, proceed */
3482 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3485 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3486 int snap, struct llc *llc)
3488 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3492 if (m->m_len < sizeof(struct ip) &&
3493 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3495 ip = mtod(m, struct ip *);
3497 m->m_pkthdr.csum_flags |= CSUM_IP;
3498 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3503 * Walk the chain and re-add the Ethernet header for
3506 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3507 nextpkt = mcur->m_nextpkt;
3508 mcur->m_nextpkt = NULL;
3510 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3514 mprev->m_nextpkt = nextpkt;
3517 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3520 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3524 mprev->m_nextpkt = nextpkt;
3527 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3530 * The previous two M_PREPEND could have inserted one or two
3531 * mbufs in front so we have to update the previous packet's
3534 mcur->m_nextpkt = nextpkt;
3536 mprev->m_nextpkt = mcur;
3538 /* The first mbuf in the original chain needs to be
3545 KMOD_IPSTAT_INC(ips_fragmented);
3549 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3550 m = mcur->m_nextpkt;
3557 bridge_linkstate(struct ifnet *ifp)
3559 struct bridge_softc *sc = ifp->if_bridge;
3560 struct bridge_iflist *bif;
3563 bif = bridge_lookup_member_if(sc, ifp);
3568 bridge_linkcheck(sc);
3571 bstp_linkstate(&bif->bif_stp);
3575 bridge_linkcheck(struct bridge_softc *sc)
3577 struct bridge_iflist *bif;
3578 int new_link, hasls;
3580 BRIDGE_LOCK_ASSERT(sc);
3581 new_link = LINK_STATE_DOWN;
3583 /* Our link is considered up if at least one of our ports is active */
3584 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3585 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3587 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3588 new_link = LINK_STATE_UP;
3592 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3593 /* If no interfaces support link-state then we default to up */
3594 new_link = LINK_STATE_UP;
3596 if_link_state_change(sc->sc_ifp, new_link);