1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
4 * SPDX-License-Identifier: BSD-4-Clause
6 * Copyright 2001 Wasabi Systems, Inc.
9 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed for the NetBSD Project by
22 * Wasabi Systems, Inc.
23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
24 * or promote products derived from this software without specific prior
27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
42 * All rights reserved.
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
63 * POSSIBILITY OF SUCH DAMAGE.
65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
69 * Network interface bridge support.
73 * - Currently only supports Ethernet-like interfaces (Ethernet,
74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
75 * to bridge other types of interfaces (maybe consider
76 * heterogeneous bridges).
79 #include <sys/cdefs.h>
80 __FBSDID("$FreeBSD$");
83 #include "opt_inet6.h"
85 #include <sys/param.h>
86 #include <sys/eventhandler.h>
88 #include <sys/malloc.h>
89 #include <sys/protosw.h>
90 #include <sys/systm.h>
93 #include <sys/socket.h> /* for net/if.h */
94 #include <sys/sockio.h>
95 #include <sys/ctype.h> /* string functions */
96 #include <sys/kernel.h>
97 #include <sys/random.h>
98 #include <sys/syslog.h>
99 #include <sys/sysctl.h>
101 #include <sys/module.h>
102 #include <sys/priv.h>
103 #include <sys/proc.h>
104 #include <sys/lock.h>
105 #include <sys/mutex.h>
109 #include <net/if_clone.h>
110 #include <net/if_dl.h>
111 #include <net/if_types.h>
112 #include <net/if_var.h>
113 #include <net/pfil.h>
114 #include <net/vnet.h>
116 #include <netinet/in.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
124 #include <netinet6/in6_ifattach.h>
126 #if defined(INET) || defined(INET6)
127 #include <netinet/ip_carp.h>
129 #include <machine/in_cksum.h>
130 #include <netinet/if_ether.h>
131 #include <net/bridgestp.h>
132 #include <net/if_bridgevar.h>
133 #include <net/if_llc.h>
134 #include <net/if_vlan_var.h>
136 #include <net/route.h>
139 * Size of the route hash table. Must be a power of two.
141 #ifndef BRIDGE_RTHASH_SIZE
142 #define BRIDGE_RTHASH_SIZE 1024
145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
148 * Default maximum number of addresses to cache.
150 #ifndef BRIDGE_RTABLE_MAX
151 #define BRIDGE_RTABLE_MAX 2000
155 * Timeout (in seconds) for entries learned dynamically.
157 #ifndef BRIDGE_RTABLE_TIMEOUT
158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
162 * Number of seconds between walks of the route list.
164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
169 * List of capabilities to possibly mask on the member interface.
171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
175 * List of capabilities to strip
177 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
180 * Bridge interface list entry.
182 struct bridge_iflist {
183 LIST_ENTRY(bridge_iflist) bif_next;
184 struct ifnet *bif_ifp; /* member if */
185 struct bstp_port bif_stp; /* STP state */
186 uint32_t bif_flags; /* member if flags */
187 int bif_savedcaps; /* saved capabilities */
188 uint32_t bif_addrmax; /* max # of addresses */
189 uint32_t bif_addrcnt; /* cur. # of addresses */
190 uint32_t bif_addrexceeded;/* # of address violations */
196 struct bridge_rtnode {
197 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
198 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
199 struct bridge_iflist *brt_dst; /* destination if */
200 unsigned long brt_expire; /* expiration time */
201 uint8_t brt_flags; /* address flags */
202 uint8_t brt_addr[ETHER_ADDR_LEN];
203 uint16_t brt_vlan; /* vlan id */
205 #define brt_ifp brt_dst->bif_ifp
208 * Software state for each bridge.
210 struct bridge_softc {
211 struct ifnet *sc_ifp; /* make this an interface */
212 LIST_ENTRY(bridge_softc) sc_list;
215 uint32_t sc_brtmax; /* max # of addresses */
216 uint32_t sc_brtcnt; /* cur. # of addresses */
217 uint32_t sc_brttimeout; /* rt timeout in seconds */
218 struct callout sc_brcallout; /* bridge callout */
219 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
220 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
221 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
222 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
223 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
224 uint32_t sc_rthash_key; /* key for hash */
225 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
226 struct bstp_state sc_stp; /* STP state */
227 uint32_t sc_brtexceeded; /* # of cache drops */
228 struct ifnet *sc_ifaddr; /* member mac copied from */
229 u_char sc_defaddr[6]; /* Default MAC address */
232 VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
233 #define V_bridge_list_mtx VNET(bridge_list_mtx)
234 static eventhandler_tag bridge_detach_cookie;
236 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
238 uma_zone_t bridge_rtnode_zone;
240 static int bridge_clone_create(struct if_clone *, int, caddr_t);
241 static void bridge_clone_destroy(struct ifnet *);
243 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
244 static void bridge_mutecaps(struct bridge_softc *);
245 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
247 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
248 static void bridge_init(void *);
249 static void bridge_dummynet(struct mbuf *, struct ifnet *);
250 static void bridge_stop(struct ifnet *, int);
251 static int bridge_transmit(struct ifnet *, struct mbuf *);
252 static void bridge_qflush(struct ifnet *);
253 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
254 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
256 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
258 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
260 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
263 static void bridge_timer(void *);
265 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
267 static void bridge_span(struct bridge_softc *, struct mbuf *);
269 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
270 uint16_t, struct bridge_iflist *, int, uint8_t);
271 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
273 static void bridge_rttrim(struct bridge_softc *);
274 static void bridge_rtage(struct bridge_softc *);
275 static void bridge_rtflush(struct bridge_softc *, int);
276 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
279 static void bridge_rtable_init(struct bridge_softc *);
280 static void bridge_rtable_fini(struct bridge_softc *);
282 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
283 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
284 const uint8_t *, uint16_t);
285 static int bridge_rtnode_insert(struct bridge_softc *,
286 struct bridge_rtnode *);
287 static void bridge_rtnode_destroy(struct bridge_softc *,
288 struct bridge_rtnode *);
289 static void bridge_rtable_expire(struct ifnet *, int);
290 static void bridge_state_change(struct ifnet *, int);
292 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
294 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
296 static void bridge_delete_member(struct bridge_softc *,
297 struct bridge_iflist *, int);
298 static void bridge_delete_span(struct bridge_softc *,
299 struct bridge_iflist *);
301 static int bridge_ioctl_add(struct bridge_softc *, void *);
302 static int bridge_ioctl_del(struct bridge_softc *, void *);
303 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
304 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
305 static int bridge_ioctl_scache(struct bridge_softc *, void *);
306 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
307 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
308 static int bridge_ioctl_rts(struct bridge_softc *, void *);
309 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
310 static int bridge_ioctl_sto(struct bridge_softc *, void *);
311 static int bridge_ioctl_gto(struct bridge_softc *, void *);
312 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
313 static int bridge_ioctl_flush(struct bridge_softc *, void *);
314 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
315 static int bridge_ioctl_spri(struct bridge_softc *, void *);
316 static int bridge_ioctl_ght(struct bridge_softc *, void *);
317 static int bridge_ioctl_sht(struct bridge_softc *, void *);
318 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
319 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
320 static int bridge_ioctl_gma(struct bridge_softc *, void *);
321 static int bridge_ioctl_sma(struct bridge_softc *, void *);
322 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
323 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
324 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
325 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
326 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
327 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
328 static int bridge_ioctl_grte(struct bridge_softc *, void *);
329 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
330 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
331 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
332 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
334 static int bridge_ip_checkbasic(struct mbuf **mp);
336 static int bridge_ip6_checkbasic(struct mbuf **mp);
338 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
339 struct ether_header *, int, struct llc *);
340 static void bridge_linkstate(struct ifnet *ifp);
341 static void bridge_linkcheck(struct bridge_softc *sc);
344 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
345 #define VLANTAGOF(_m) \
346 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
348 static struct bstp_cb_ops bridge_ops = {
349 .bcb_state = bridge_state_change,
350 .bcb_rtage = bridge_rtable_expire
353 SYSCTL_DECL(_net_link);
354 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
356 /* only pass IP[46] packets when pfil is enabled */
357 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
358 #define V_pfil_onlyip VNET(pfil_onlyip)
359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
360 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
361 "Only pass IP packets when pfil is enabled");
363 /* run pfil hooks on the bridge interface */
364 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
365 #define V_pfil_bridge VNET(pfil_bridge)
366 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
367 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
368 "Packet filter on the bridge interface");
370 /* layer2 filter with ipfw */
371 VNET_DEFINE_STATIC(int, pfil_ipfw);
372 #define V_pfil_ipfw VNET(pfil_ipfw)
374 /* layer2 ARP filter with ipfw */
375 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
376 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
377 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
378 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
379 "Filter ARP packets through IPFW layer2");
381 /* run pfil hooks on the member interface */
382 VNET_DEFINE_STATIC(int, pfil_member) = 1;
383 #define V_pfil_member VNET(pfil_member)
384 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
385 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
386 "Packet filter on the member interface");
388 /* run pfil hooks on the physical interface for locally destined packets */
389 VNET_DEFINE_STATIC(int, pfil_local_phys);
390 #define V_pfil_local_phys VNET(pfil_local_phys)
391 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
392 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
393 "Packet filter on the physical interface for locally destined packets");
395 /* log STP state changes */
396 VNET_DEFINE_STATIC(int, log_stp);
397 #define V_log_stp VNET(log_stp)
398 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
399 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
400 "Log STP state changes");
402 /* share MAC with first bridge member */
403 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
404 #define V_bridge_inherit_mac VNET(bridge_inherit_mac)
405 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
406 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
407 "Inherit MAC address from the first bridge member");
409 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
410 #define V_allow_llz_overlap VNET(allow_llz_overlap)
411 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
412 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
413 "Allow overlap of link-local scope "
414 "zones of a bridge interface and the member interfaces");
416 struct bridge_control {
417 int (*bc_func)(struct bridge_softc *, void *);
422 #define BC_F_COPYIN 0x01 /* copy arguments in */
423 #define BC_F_COPYOUT 0x02 /* copy arguments out */
424 #define BC_F_SUSER 0x04 /* do super-user check */
426 const struct bridge_control bridge_control_table[] = {
427 { bridge_ioctl_add, sizeof(struct ifbreq),
428 BC_F_COPYIN|BC_F_SUSER },
429 { bridge_ioctl_del, sizeof(struct ifbreq),
430 BC_F_COPYIN|BC_F_SUSER },
432 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
433 BC_F_COPYIN|BC_F_COPYOUT },
434 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
435 BC_F_COPYIN|BC_F_SUSER },
437 { bridge_ioctl_scache, sizeof(struct ifbrparam),
438 BC_F_COPYIN|BC_F_SUSER },
439 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
442 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
443 BC_F_COPYIN|BC_F_COPYOUT },
444 { bridge_ioctl_rts, sizeof(struct ifbaconf),
445 BC_F_COPYIN|BC_F_COPYOUT },
447 { bridge_ioctl_saddr, sizeof(struct ifbareq),
448 BC_F_COPYIN|BC_F_SUSER },
450 { bridge_ioctl_sto, sizeof(struct ifbrparam),
451 BC_F_COPYIN|BC_F_SUSER },
452 { bridge_ioctl_gto, sizeof(struct ifbrparam),
455 { bridge_ioctl_daddr, sizeof(struct ifbareq),
456 BC_F_COPYIN|BC_F_SUSER },
458 { bridge_ioctl_flush, sizeof(struct ifbreq),
459 BC_F_COPYIN|BC_F_SUSER },
461 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
463 { bridge_ioctl_spri, sizeof(struct ifbrparam),
464 BC_F_COPYIN|BC_F_SUSER },
466 { bridge_ioctl_ght, sizeof(struct ifbrparam),
468 { bridge_ioctl_sht, sizeof(struct ifbrparam),
469 BC_F_COPYIN|BC_F_SUSER },
471 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
473 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
474 BC_F_COPYIN|BC_F_SUSER },
476 { bridge_ioctl_gma, sizeof(struct ifbrparam),
478 { bridge_ioctl_sma, sizeof(struct ifbrparam),
479 BC_F_COPYIN|BC_F_SUSER },
481 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
482 BC_F_COPYIN|BC_F_SUSER },
484 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
485 BC_F_COPYIN|BC_F_SUSER },
487 { bridge_ioctl_addspan, sizeof(struct ifbreq),
488 BC_F_COPYIN|BC_F_SUSER },
489 { bridge_ioctl_delspan, sizeof(struct ifbreq),
490 BC_F_COPYIN|BC_F_SUSER },
492 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
495 { bridge_ioctl_grte, sizeof(struct ifbrparam),
498 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
499 BC_F_COPYIN|BC_F_COPYOUT },
501 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
502 BC_F_COPYIN|BC_F_SUSER },
504 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
505 BC_F_COPYIN|BC_F_SUSER },
507 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
508 BC_F_COPYIN|BC_F_SUSER },
511 const int bridge_control_table_size = nitems(bridge_control_table);
513 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
514 #define V_bridge_list VNET(bridge_list)
515 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
516 "if_bridge list", NULL, MTX_DEF)
517 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
518 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
519 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
521 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
522 #define V_bridge_cloner VNET(bridge_cloner)
524 static const char bridge_name[] = "bridge";
527 vnet_bridge_init(const void *unused __unused)
530 BRIDGE_LIST_LOCK_INIT();
531 LIST_INIT(&V_bridge_list);
532 V_bridge_cloner = if_clone_simple(bridge_name,
533 bridge_clone_create, bridge_clone_destroy, 0);
535 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
536 vnet_bridge_init, NULL);
539 vnet_bridge_uninit(const void *unused __unused)
542 if_clone_detach(V_bridge_cloner);
543 V_bridge_cloner = NULL;
544 BRIDGE_LIST_LOCK_DESTROY();
546 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
547 vnet_bridge_uninit, NULL);
550 bridge_modevent(module_t mod, int type, void *data)
555 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
556 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
558 bridge_dn_p = bridge_dummynet;
559 bridge_detach_cookie = EVENTHANDLER_REGISTER(
560 ifnet_departure_event, bridge_ifdetach, NULL,
561 EVENTHANDLER_PRI_ANY);
564 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
565 bridge_detach_cookie);
566 uma_zdestroy(bridge_rtnode_zone);
575 static moduledata_t bridge_mod = {
581 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
582 MODULE_VERSION(if_bridge, 1);
583 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
586 * handler for net.link.bridge.ipfw
589 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
591 int enable = V_pfil_ipfw;
594 error = sysctl_handle_int(oidp, &enable, 0, req);
597 if (enable != V_pfil_ipfw) {
598 V_pfil_ipfw = enable;
601 * Disable pfil so that ipfw doesnt run twice, if the user
602 * really wants both then they can re-enable pfil_bridge and/or
603 * pfil_member. Also allow non-ip packets as ipfw can filter by
615 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
616 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
617 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
618 "Layer2 filter with IPFW");
621 * bridge_clone_create:
623 * Create a new bridge instance.
626 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
628 struct bridge_softc *sc, *sc2;
629 struct ifnet *bifp, *ifp;
631 unsigned long hostid;
633 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
634 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
640 BRIDGE_LOCK_INIT(sc);
641 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
642 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
644 /* Initialize our routing table. */
645 bridge_rtable_init(sc);
647 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
649 LIST_INIT(&sc->sc_iflist);
650 LIST_INIT(&sc->sc_spanlist);
653 if_initname(ifp, bridge_name, unit);
654 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
655 ifp->if_ioctl = bridge_ioctl;
656 ifp->if_transmit = bridge_transmit;
657 ifp->if_qflush = bridge_qflush;
658 ifp->if_init = bridge_init;
659 ifp->if_type = IFT_BRIDGE;
662 * Generate an ethernet address with a locally administered address.
664 * Since we are using random ethernet addresses for the bridge, it is
665 * possible that we might have address collisions, so make sure that
666 * this hardware address isn't already in use on another bridge.
667 * The first try uses the hostid and falls back to arc4rand().
670 getcredhostid(curthread->td_ucred, &hostid);
672 if (fb || hostid == 0) {
673 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
674 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
675 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
677 sc->sc_defaddr[0] = 0x2;
678 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
679 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
680 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
681 sc->sc_defaddr[4] = hostid & 0xff;
682 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
688 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
690 if (memcmp(sc->sc_defaddr,
691 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
696 BRIDGE_LIST_UNLOCK();
697 } while (retry == 1);
699 bstp_attach(&sc->sc_stp, &bridge_ops);
700 ether_ifattach(ifp, sc->sc_defaddr);
701 /* Now undo some of the damage... */
702 ifp->if_baudrate = 0;
703 ifp->if_type = IFT_BRIDGE;
706 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
707 BRIDGE_LIST_UNLOCK();
713 * bridge_clone_destroy:
715 * Destroy a bridge instance.
718 bridge_clone_destroy(struct ifnet *ifp)
720 struct bridge_softc *sc = ifp->if_softc;
721 struct bridge_iflist *bif;
726 ifp->if_flags &= ~IFF_UP;
728 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
729 bridge_delete_member(sc, bif, 0);
731 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
732 bridge_delete_span(sc, bif);
737 callout_drain(&sc->sc_brcallout);
740 LIST_REMOVE(sc, sc_list);
741 BRIDGE_LIST_UNLOCK();
743 bstp_detach(&sc->sc_stp);
747 /* Tear down the routing table. */
748 bridge_rtable_fini(sc);
750 BRIDGE_LOCK_DESTROY(sc);
757 * Handle a control request from the operator.
760 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
762 struct bridge_softc *sc = ifp->if_softc;
763 struct ifreq *ifr = (struct ifreq *)data;
764 struct bridge_iflist *bif;
765 struct thread *td = curthread;
767 struct ifbreq ifbreq;
768 struct ifbifconf ifbifconf;
769 struct ifbareq ifbareq;
770 struct ifbaconf ifbaconf;
771 struct ifbrparam ifbrparam;
772 struct ifbropreq ifbropreq;
774 struct ifdrv *ifd = (struct ifdrv *) data;
775 const struct bridge_control *bc;
786 if (ifd->ifd_cmd >= bridge_control_table_size) {
790 bc = &bridge_control_table[ifd->ifd_cmd];
792 if (cmd == SIOCGDRVSPEC &&
793 (bc->bc_flags & BC_F_COPYOUT) == 0) {
797 else if (cmd == SIOCSDRVSPEC &&
798 (bc->bc_flags & BC_F_COPYOUT) != 0) {
803 if (bc->bc_flags & BC_F_SUSER) {
804 error = priv_check(td, PRIV_NET_BRIDGE);
809 if (ifd->ifd_len != bc->bc_argsize ||
810 ifd->ifd_len > sizeof(args)) {
815 bzero(&args, sizeof(args));
816 if (bc->bc_flags & BC_F_COPYIN) {
817 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
823 error = (*bc->bc_func)(sc, &args);
828 if (bc->bc_flags & BC_F_COPYOUT)
829 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
834 if (!(ifp->if_flags & IFF_UP) &&
835 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
837 * If interface is marked down and it is running,
838 * then stop and disable it.
843 } else if ((ifp->if_flags & IFF_UP) &&
844 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
846 * If interface is marked up and it is stopped, then
854 if (ifr->ifr_mtu < 576) {
858 if (LIST_EMPTY(&sc->sc_iflist)) {
859 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
863 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
864 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
865 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
866 " != %d\n", sc->sc_ifp->if_xname,
867 bif->bif_ifp->if_mtu,
868 bif->bif_ifp->if_xname, ifr->ifr_mtu);
874 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
879 * drop the lock as ether_ioctl() will call bridge_start() and
880 * cause the lock to be recursed.
882 error = ether_ioctl(ifp, cmd, data);
892 * Clear or restore unwanted capabilities on the member interface
895 bridge_mutecaps(struct bridge_softc *sc)
897 struct bridge_iflist *bif;
900 /* Initial bitmask of capabilities to test */
901 mask = BRIDGE_IFCAPS_MASK;
903 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
904 /* Every member must support it or its disabled */
905 mask &= bif->bif_savedcaps;
909 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
910 enabled = bif->bif_ifp->if_capenable;
911 enabled &= ~BRIDGE_IFCAPS_STRIP;
912 /* strip off mask bits and enable them again if allowed */
913 enabled &= ~BRIDGE_IFCAPS_MASK;
916 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 BRIDGE_UNLOCK_ASSERT(sc);
932 bzero(&ifr, sizeof(ifr));
933 ifr.ifr_reqcap = set;
935 if (ifp->if_capenable != set) {
936 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
938 if_printf(sc->sc_ifp,
939 "error setting capabilities on %s: %d\n",
940 ifp->if_xname, error);
941 if ((ifp->if_capenable & ~set) != 0)
942 if_printf(sc->sc_ifp,
943 "can't disable some capabilities on %s: 0x%x\n",
944 ifp->if_xname, ifp->if_capenable & ~set);
949 * bridge_lookup_member:
951 * Lookup a bridge member interface.
953 static struct bridge_iflist *
954 bridge_lookup_member(struct bridge_softc *sc, const char *name)
956 struct bridge_iflist *bif;
959 BRIDGE_LOCK_ASSERT(sc);
961 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
963 if (strcmp(ifp->if_xname, name) == 0)
971 * bridge_lookup_member_if:
973 * Lookup a bridge member interface by ifnet*.
975 static struct bridge_iflist *
976 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
978 struct bridge_iflist *bif;
980 BRIDGE_LOCK_ASSERT(sc);
982 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
983 if (bif->bif_ifp == member_ifp)
991 * bridge_delete_member:
993 * Delete the specified member interface.
996 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
999 struct ifnet *ifs = bif->bif_ifp;
1000 struct ifnet *fif = NULL;
1002 BRIDGE_LOCK_ASSERT(sc);
1004 if (bif->bif_flags & IFBIF_STP)
1005 bstp_disable(&bif->bif_stp);
1007 ifs->if_bridge = NULL;
1009 LIST_REMOVE(bif, bif_next);
1013 * If removing the interface that gave the bridge its mac address, set
1014 * the mac address of the bridge to the address of the next member, or
1015 * to its default address if no members are left.
1017 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1018 if (LIST_EMPTY(&sc->sc_iflist)) {
1019 bcopy(sc->sc_defaddr,
1020 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1021 sc->sc_ifaddr = NULL;
1023 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1024 bcopy(IF_LLADDR(fif),
1025 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1026 sc->sc_ifaddr = fif;
1028 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1031 bridge_linkcheck(sc);
1032 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
1033 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1034 KASSERT(bif->bif_addrcnt == 0,
1035 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1037 ifs->if_bridge_output = NULL;
1038 ifs->if_bridge_input = NULL;
1039 ifs->if_bridge_linkstate = NULL;
1042 switch (ifs->if_type) {
1046 * Take the interface out of promiscuous mode, but only
1047 * if it was promiscuous in the first place. It might
1048 * not be if we're in the bridge_ioctl_add() error path.
1050 if (ifs->if_flags & IFF_PROMISC)
1051 (void) ifpromisc(ifs, 0);
1059 panic("bridge_delete_member: impossible");
1063 /* reneable any interface capabilities */
1064 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1066 bstp_destroy(&bif->bif_stp); /* prepare to free */
1068 free(bif, M_DEVBUF);
1072 * bridge_delete_span:
1074 * Delete the specified span interface.
1077 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1079 BRIDGE_LOCK_ASSERT(sc);
1081 KASSERT(bif->bif_ifp->if_bridge == NULL,
1082 ("%s: not a span interface", __func__));
1084 LIST_REMOVE(bif, bif_next);
1085 free(bif, M_DEVBUF);
1089 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1091 struct ifbreq *req = arg;
1092 struct bridge_iflist *bif = NULL;
1096 ifs = ifunit(req->ifbr_ifsname);
1099 if (ifs->if_ioctl == NULL) /* must be supported */
1102 /* If it's in the span list, it can't be a member. */
1103 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1104 if (ifs == bif->bif_ifp)
1107 if (ifs->if_bridge == sc)
1110 if (ifs->if_bridge != NULL)
1113 switch (ifs->if_type) {
1117 /* permitted interface types */
1125 * Two valid inet6 addresses with link-local scope must not be
1126 * on the parent interface and the member interfaces at the
1127 * same time. This restriction is needed to prevent violation
1128 * of link-local scope zone. Attempts to add a member
1129 * interface which has inet6 addresses when the parent has
1130 * inet6 triggers removal of all inet6 addresses on the member
1134 /* Check if the parent interface has a link-local scope addr. */
1135 if (V_allow_llz_overlap == 0 &&
1136 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1138 * If any, remove all inet6 addresses from the member
1142 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1143 if (in6ifa_llaonifp(bif->bif_ifp)) {
1145 in6_ifdetach(bif->bif_ifp);
1147 if_printf(sc->sc_ifp,
1148 "IPv6 addresses on %s have been removed "
1149 "before adding it as a member to prevent "
1150 "IPv6 address scope violation.\n",
1151 bif->bif_ifp->if_xname);
1155 if (in6ifa_llaonifp(ifs)) {
1159 if_printf(sc->sc_ifp,
1160 "IPv6 addresses on %s have been removed "
1161 "before adding it as a member to prevent "
1162 "IPv6 address scope violation.\n",
1167 /* Allow the first Ethernet member to define the MTU */
1168 if (LIST_EMPTY(&sc->sc_iflist))
1169 sc->sc_ifp->if_mtu = ifs->if_mtu;
1170 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1171 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1172 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1176 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1181 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1182 bif->bif_savedcaps = ifs->if_capenable;
1185 * Assign the interface's MAC address to the bridge if it's the first
1186 * member and the MAC address of the bridge has not been changed from
1187 * the default randomly generated one.
1189 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1190 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1191 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1192 sc->sc_ifaddr = ifs;
1193 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1196 ifs->if_bridge = sc;
1197 ifs->if_bridge_output = bridge_output;
1198 ifs->if_bridge_input = bridge_input;
1199 ifs->if_bridge_linkstate = bridge_linkstate;
1200 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1202 * XXX: XLOCK HERE!?!
1204 * NOTE: insert_***HEAD*** should be safe for the traversals.
1206 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1208 /* Set interface capabilities to the intersection set of all members */
1209 bridge_mutecaps(sc);
1210 bridge_linkcheck(sc);
1212 /* Place the interface into promiscuous mode */
1213 switch (ifs->if_type) {
1217 error = ifpromisc(ifs, 1);
1223 bridge_delete_member(sc, bif, 0);
1228 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1230 struct ifbreq *req = arg;
1231 struct bridge_iflist *bif;
1233 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1237 bridge_delete_member(sc, bif, 0);
1243 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1245 struct ifbreq *req = arg;
1246 struct bridge_iflist *bif;
1247 struct bstp_port *bp;
1249 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1254 req->ifbr_ifsflags = bif->bif_flags;
1255 req->ifbr_state = bp->bp_state;
1256 req->ifbr_priority = bp->bp_priority;
1257 req->ifbr_path_cost = bp->bp_path_cost;
1258 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1259 req->ifbr_proto = bp->bp_protover;
1260 req->ifbr_role = bp->bp_role;
1261 req->ifbr_stpflags = bp->bp_flags;
1262 req->ifbr_addrcnt = bif->bif_addrcnt;
1263 req->ifbr_addrmax = bif->bif_addrmax;
1264 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1266 /* Copy STP state options as flags */
1267 if (bp->bp_operedge)
1268 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1269 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1270 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1271 if (bp->bp_ptp_link)
1272 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1273 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1274 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1275 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1276 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1277 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1278 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1283 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1285 struct ifbreq *req = arg;
1286 struct bridge_iflist *bif;
1287 struct bstp_port *bp;
1290 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1295 if (req->ifbr_ifsflags & IFBIF_SPAN)
1296 /* SPAN is readonly */
1299 if (req->ifbr_ifsflags & IFBIF_STP) {
1300 if ((bif->bif_flags & IFBIF_STP) == 0) {
1301 error = bstp_enable(&bif->bif_stp);
1306 if ((bif->bif_flags & IFBIF_STP) != 0)
1307 bstp_disable(&bif->bif_stp);
1310 /* Pass on STP flags */
1311 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1312 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1313 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1314 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1316 /* Save the bits relating to the bridge */
1317 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1323 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1325 struct ifbrparam *param = arg;
1327 sc->sc_brtmax = param->ifbrp_csize;
1334 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1336 struct ifbrparam *param = arg;
1338 param->ifbrp_csize = sc->sc_brtmax;
1344 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1346 struct ifbifconf *bifc = arg;
1347 struct bridge_iflist *bif;
1350 int count, buflen, len, error = 0;
1353 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1355 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1358 buflen = sizeof(breq) * count;
1359 if (bifc->ifbic_len == 0) {
1360 bifc->ifbic_len = buflen;
1364 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1369 len = min(bifc->ifbic_len, buflen);
1370 bzero(&breq, sizeof(breq));
1371 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1372 if (len < sizeof(breq))
1375 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1376 sizeof(breq.ifbr_ifsname));
1377 /* Fill in the ifbreq structure */
1378 error = bridge_ioctl_gifflags(sc, &breq);
1381 memcpy(buf, &breq, sizeof(breq));
1383 buf += sizeof(breq);
1384 len -= sizeof(breq);
1386 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1387 if (len < sizeof(breq))
1390 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1391 sizeof(breq.ifbr_ifsname));
1392 breq.ifbr_ifsflags = bif->bif_flags;
1393 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1394 memcpy(buf, &breq, sizeof(breq));
1396 buf += sizeof(breq);
1397 len -= sizeof(breq);
1401 bifc->ifbic_len = sizeof(breq) * count;
1402 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1404 free(outbuf, M_TEMP);
1409 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1411 struct ifbaconf *bac = arg;
1412 struct bridge_rtnode *brt;
1413 struct ifbareq bareq;
1415 int count, buflen, len, error = 0;
1417 if (bac->ifbac_len == 0)
1421 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1423 buflen = sizeof(bareq) * count;
1426 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1431 len = min(bac->ifbac_len, buflen);
1432 bzero(&bareq, sizeof(bareq));
1433 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1434 if (len < sizeof(bareq))
1436 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1437 sizeof(bareq.ifba_ifsname));
1438 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1439 bareq.ifba_vlan = brt->brt_vlan;
1440 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1441 time_uptime < brt->brt_expire)
1442 bareq.ifba_expire = brt->brt_expire - time_uptime;
1444 bareq.ifba_expire = 0;
1445 bareq.ifba_flags = brt->brt_flags;
1447 memcpy(buf, &bareq, sizeof(bareq));
1449 buf += sizeof(bareq);
1450 len -= sizeof(bareq);
1454 bac->ifbac_len = sizeof(bareq) * count;
1455 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1457 free(outbuf, M_TEMP);
1462 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1464 struct ifbareq *req = arg;
1465 struct bridge_iflist *bif;
1468 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1472 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1479 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1481 struct ifbrparam *param = arg;
1483 sc->sc_brttimeout = param->ifbrp_ctime;
1488 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1490 struct ifbrparam *param = arg;
1492 param->ifbrp_ctime = sc->sc_brttimeout;
1497 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1499 struct ifbareq *req = arg;
1501 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1505 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1507 struct ifbreq *req = arg;
1509 bridge_rtflush(sc, req->ifbr_ifsflags);
1514 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1516 struct ifbrparam *param = arg;
1517 struct bstp_state *bs = &sc->sc_stp;
1519 param->ifbrp_prio = bs->bs_bridge_priority;
1524 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1526 struct ifbrparam *param = arg;
1528 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1532 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1534 struct ifbrparam *param = arg;
1535 struct bstp_state *bs = &sc->sc_stp;
1537 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1542 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1544 struct ifbrparam *param = arg;
1546 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1550 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1552 struct ifbrparam *param = arg;
1553 struct bstp_state *bs = &sc->sc_stp;
1555 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1560 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1562 struct ifbrparam *param = arg;
1564 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1568 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1570 struct ifbrparam *param = arg;
1571 struct bstp_state *bs = &sc->sc_stp;
1573 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1578 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1580 struct ifbrparam *param = arg;
1582 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1586 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1588 struct ifbreq *req = arg;
1589 struct bridge_iflist *bif;
1591 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1595 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1599 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1601 struct ifbreq *req = arg;
1602 struct bridge_iflist *bif;
1604 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1608 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1612 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1614 struct ifbreq *req = arg;
1615 struct bridge_iflist *bif;
1617 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1621 bif->bif_addrmax = req->ifbr_addrmax;
1626 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1628 struct ifbreq *req = arg;
1629 struct bridge_iflist *bif = NULL;
1632 ifs = ifunit(req->ifbr_ifsname);
1636 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1637 if (ifs == bif->bif_ifp)
1640 if (ifs->if_bridge != NULL)
1643 switch (ifs->if_type) {
1652 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1657 bif->bif_flags = IFBIF_SPAN;
1659 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1665 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1667 struct ifbreq *req = arg;
1668 struct bridge_iflist *bif;
1671 ifs = ifunit(req->ifbr_ifsname);
1675 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1676 if (ifs == bif->bif_ifp)
1682 bridge_delete_span(sc, bif);
1688 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1690 struct ifbropreq *req = arg;
1691 struct bstp_state *bs = &sc->sc_stp;
1692 struct bstp_port *root_port;
1694 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1695 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1696 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1698 root_port = bs->bs_root_port;
1699 if (root_port == NULL)
1700 req->ifbop_root_port = 0;
1702 req->ifbop_root_port = root_port->bp_ifp->if_index;
1704 req->ifbop_holdcount = bs->bs_txholdcount;
1705 req->ifbop_priority = bs->bs_bridge_priority;
1706 req->ifbop_protocol = bs->bs_protover;
1707 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1708 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1709 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1710 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1711 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1712 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1718 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1720 struct ifbrparam *param = arg;
1722 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1727 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1729 struct ifbpstpconf *bifstp = arg;
1730 struct bridge_iflist *bif;
1731 struct bstp_port *bp;
1732 struct ifbpstpreq bpreq;
1734 int count, buflen, len, error = 0;
1737 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1738 if ((bif->bif_flags & IFBIF_STP) != 0)
1742 buflen = sizeof(bpreq) * count;
1743 if (bifstp->ifbpstp_len == 0) {
1744 bifstp->ifbpstp_len = buflen;
1749 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1754 len = min(bifstp->ifbpstp_len, buflen);
1755 bzero(&bpreq, sizeof(bpreq));
1756 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1757 if (len < sizeof(bpreq))
1760 if ((bif->bif_flags & IFBIF_STP) == 0)
1764 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1765 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1766 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1767 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1768 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1769 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1771 memcpy(buf, &bpreq, sizeof(bpreq));
1773 buf += sizeof(bpreq);
1774 len -= sizeof(bpreq);
1778 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1779 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1781 free(outbuf, M_TEMP);
1786 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1788 struct ifbrparam *param = arg;
1790 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1794 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1796 struct ifbrparam *param = arg;
1798 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1804 * Detach an interface from a bridge. Called when a member
1805 * interface is detaching.
1808 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1810 struct bridge_softc *sc = ifp->if_bridge;
1811 struct bridge_iflist *bif;
1813 if (ifp->if_flags & IFF_RENAMING)
1815 if (V_bridge_cloner == NULL) {
1817 * This detach handler can be called after
1818 * vnet_bridge_uninit(). Just return in that case.
1822 /* Check if the interface is a bridge member */
1826 bif = bridge_lookup_member_if(sc, ifp);
1828 bridge_delete_member(sc, bif, 1);
1834 /* Check if the interface is a span port */
1836 LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1838 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1839 if (ifp == bif->bif_ifp) {
1840 bridge_delete_span(sc, bif);
1846 BRIDGE_LIST_UNLOCK();
1852 * Initialize a bridge interface.
1855 bridge_init(void *xsc)
1857 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1858 struct ifnet *ifp = sc->sc_ifp;
1860 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1864 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1867 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1868 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1876 * Stop the bridge interface.
1879 bridge_stop(struct ifnet *ifp, int disable)
1881 struct bridge_softc *sc = ifp->if_softc;
1883 BRIDGE_LOCK_ASSERT(sc);
1885 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1888 callout_stop(&sc->sc_brcallout);
1889 bstp_stop(&sc->sc_stp);
1891 bridge_rtflush(sc, IFBF_FLUSHDYN);
1893 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1899 * Enqueue a packet on a bridge member interface.
1903 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1909 /* We may be sending a fragment so traverse the mbuf */
1912 m->m_nextpkt = NULL;
1913 len = m->m_pkthdr.len;
1914 mflags = m->m_flags;
1917 * If underlying interface can not do VLAN tag insertion itself
1918 * then attach a packet tag that holds it.
1920 if ((m->m_flags & M_VLANTAG) &&
1921 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1922 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1925 "unable to prepend VLAN header\n");
1926 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1929 m->m_flags &= ~M_VLANTAG;
1932 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1933 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1935 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1939 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1940 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1941 if (mflags & M_MCAST)
1942 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1951 * Receive a queued packet from dummynet and pass it on to the output
1954 * The mbuf has the Ethernet header already attached.
1957 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1959 struct bridge_softc *sc;
1961 sc = ifp->if_bridge;
1964 * The packet didnt originate from a member interface. This should only
1965 * ever happen if a member interface is removed while packets are
1973 if (PFIL_HOOKED(&V_inet_pfil_hook)
1975 || PFIL_HOOKED(&V_inet6_pfil_hook)
1978 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1984 bridge_enqueue(sc, ifp, m);
1990 * Send output from a bridge member interface. This
1991 * performs the bridging function for locally originated
1994 * The mbuf has the Ethernet header already attached. We must
1995 * enqueue or free the mbuf before returning.
1998 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2001 struct ether_header *eh;
2002 struct ifnet *dst_if;
2003 struct bridge_softc *sc;
2006 if (m->m_len < ETHER_HDR_LEN) {
2007 m = m_pullup(m, ETHER_HDR_LEN);
2012 eh = mtod(m, struct ether_header *);
2013 sc = ifp->if_bridge;
2014 vlan = VLANTAGOF(m);
2019 * If bridge is down, but the original output interface is up,
2020 * go ahead and send out that interface. Otherwise, the packet
2023 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2029 * If the packet is a multicast, or we don't know a better way to
2030 * get there, send to all interfaces.
2032 if (ETHER_IS_MULTICAST(eh->ether_dhost))
2035 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2036 if (dst_if == NULL) {
2037 struct bridge_iflist *bif;
2039 int error = 0, used = 0;
2043 BRIDGE_LOCK2REF(sc, error);
2049 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2050 dst_if = bif->bif_ifp;
2052 if (dst_if->if_type == IFT_GIF)
2054 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2058 * If this is not the original output interface,
2059 * and the interface is participating in spanning
2060 * tree, make sure the port is in a state that
2061 * allows forwarding.
2063 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2064 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2067 if (LIST_NEXT(bif, bif_next) == NULL) {
2071 mc = m_copypacket(m, M_NOWAIT);
2073 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2078 bridge_enqueue(sc, dst_if, mc);
2088 * XXX Spanning tree consideration here?
2092 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2099 bridge_enqueue(sc, dst_if, m);
2106 * Do output on a bridge.
2110 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2112 struct bridge_softc *sc;
2113 struct ether_header *eh;
2114 struct ifnet *dst_if;
2119 ETHER_BPF_MTAP(ifp, m);
2121 eh = mtod(m, struct ether_header *);
2124 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2125 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2127 error = bridge_enqueue(sc, dst_if, m);
2129 bridge_broadcast(sc, ifp, m, 0);
2135 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2138 bridge_qflush(struct ifnet *ifp __unused)
2145 * The forwarding function of the bridge.
2147 * NOTE: Releases the lock on return.
2150 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2153 struct bridge_iflist *dbif;
2154 struct ifnet *src_if, *dst_if, *ifp;
2155 struct ether_header *eh;
2160 src_if = m->m_pkthdr.rcvif;
2163 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2164 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2165 vlan = VLANTAGOF(m);
2167 if ((sbif->bif_flags & IFBIF_STP) &&
2168 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2171 eh = mtod(m, struct ether_header *);
2172 dst = eh->ether_dhost;
2174 /* If the interface is learning, record the address. */
2175 if (sbif->bif_flags & IFBIF_LEARNING) {
2176 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2177 sbif, 0, IFBAF_DYNAMIC);
2179 * If the interface has addresses limits then deny any source
2180 * that is not in the cache.
2182 if (error && sbif->bif_addrmax)
2186 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2187 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2191 * At this point, the port either doesn't participate
2192 * in spanning tree or it is in the forwarding state.
2196 * If the packet is unicast, destined for someone on
2197 * "this" side of the bridge, drop it.
2199 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2200 dst_if = bridge_rtlookup(sc, dst, vlan);
2201 if (src_if == dst_if)
2205 * Check if its a reserved multicast address, any address
2206 * listed in 802.1D section 7.12.6 may not be forwarded by the
2208 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2210 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2211 dst[2] == 0xc2 && dst[3] == 0x00 &&
2212 dst[4] == 0x00 && dst[5] <= 0x0f)
2215 /* ...forward it to all interfaces. */
2216 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2221 * If we have a destination interface which is a member of our bridge,
2222 * OR this is a unicast packet, push it through the bpf(4) machinery.
2223 * For broadcast or multicast packets, don't bother because it will
2224 * be reinjected into ether_input. We do this before we pass the packets
2225 * through the pfil(9) framework, as it is possible that pfil(9) will
2226 * drop the packet, or possibly modify it, making it difficult to debug
2227 * firewall issues on the bridge.
2229 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2230 ETHER_BPF_MTAP(ifp, m);
2232 /* run the packet filter */
2233 if (PFIL_HOOKED(&V_inet_pfil_hook)
2235 || PFIL_HOOKED(&V_inet6_pfil_hook)
2239 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2246 if (dst_if == NULL) {
2247 bridge_broadcast(sc, src_if, m, 1);
2252 * At this point, we're dealing with a unicast frame
2253 * going to a different interface.
2255 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2258 dbif = bridge_lookup_member_if(sc, dst_if);
2260 /* Not a member of the bridge (anymore?) */
2263 /* Private segments can not talk to each other */
2264 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2267 if ((dbif->bif_flags & IFBIF_STP) &&
2268 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2273 if (PFIL_HOOKED(&V_inet_pfil_hook)
2275 || PFIL_HOOKED(&V_inet6_pfil_hook)
2278 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2284 bridge_enqueue(sc, dst_if, m);
2295 * Receive input from a member interface. Queue the packet for
2296 * bridging if it is not for us.
2298 static struct mbuf *
2299 bridge_input(struct ifnet *ifp, struct mbuf *m)
2301 struct bridge_softc *sc = ifp->if_bridge;
2302 struct bridge_iflist *bif, *bif2;
2304 struct ether_header *eh;
2305 struct mbuf *mc, *mc2;
2309 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2313 vlan = VLANTAGOF(m);
2316 * Implement support for bridge monitoring. If this flag has been
2317 * set on this interface, discard the packet once we push it through
2318 * the bpf(4) machinery, but before we do, increment the byte and
2319 * packet counters associated with this interface.
2321 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2322 m->m_pkthdr.rcvif = bifp;
2323 ETHER_BPF_MTAP(bifp, m);
2324 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2325 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2330 bif = bridge_lookup_member_if(sc, ifp);
2336 eh = mtod(m, struct ether_header *);
2340 if (m->m_flags & (M_BCAST|M_MCAST)) {
2341 /* Tap off 802.1D packets; they do not get forwarded. */
2342 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2343 ETHER_ADDR_LEN) == 0) {
2344 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2349 if ((bif->bif_flags & IFBIF_STP) &&
2350 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2356 * Make a deep copy of the packet and enqueue the copy
2357 * for bridge processing; return the original packet for
2360 mc = m_dup(m, M_NOWAIT);
2366 /* Perform the bridge forwarding function with the copy. */
2367 bridge_forward(sc, bif, mc);
2370 * Reinject the mbuf as arriving on the bridge so we have a
2371 * chance at claiming multicast packets. We can not loop back
2372 * here from ether_input as a bridge is never a member of a
2375 KASSERT(bifp->if_bridge == NULL,
2376 ("loop created in bridge_input"));
2377 mc2 = m_dup(m, M_NOWAIT);
2379 /* Keep the layer3 header aligned */
2380 int i = min(mc2->m_pkthdr.len, max_protohdr);
2381 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2384 mc2->m_pkthdr.rcvif = bifp;
2385 (*bifp->if_input)(bifp, mc2);
2388 /* Return the original packet for local processing. */
2392 if ((bif->bif_flags & IFBIF_STP) &&
2393 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2398 #if (defined(INET) || defined(INET6))
2399 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2400 || ((iface)->if_carp \
2401 && (*carp_forus_p)((iface), eh->ether_dhost))
2402 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2403 || ((iface)->if_carp \
2404 && (*carp_forus_p)((iface), eh->ether_shost))
2406 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2407 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2411 # define OR_PFIL_HOOKED_INET6 \
2412 || PFIL_HOOKED(&V_inet6_pfil_hook)
2414 # define OR_PFIL_HOOKED_INET6
2417 #define GRAB_OUR_PACKETS(iface) \
2418 if ((iface)->if_type == IFT_GIF) \
2420 /* It is destined for us. */ \
2421 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2422 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2424 if ((iface)->if_type == IFT_BRIDGE) { \
2425 ETHER_BPF_MTAP(iface, m); \
2426 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \
2427 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2428 /* Filter on the physical interface. */ \
2429 if (V_pfil_local_phys && \
2430 (PFIL_HOOKED(&V_inet_pfil_hook) \
2431 OR_PFIL_HOOKED_INET6)) { \
2432 if (bridge_pfil(&m, NULL, ifp, \
2433 PFIL_IN) != 0 || m == NULL) { \
2434 BRIDGE_UNLOCK(sc); \
2437 eh = mtod(m, struct ether_header *); \
2440 if (bif->bif_flags & IFBIF_LEARNING) { \
2441 error = bridge_rtupdate(sc, eh->ether_shost, \
2442 vlan, bif, 0, IFBAF_DYNAMIC); \
2443 if (error && bif->bif_addrmax) { \
2444 BRIDGE_UNLOCK(sc); \
2449 m->m_pkthdr.rcvif = iface; \
2450 BRIDGE_UNLOCK(sc); \
2454 /* We just received a packet that we sent out. */ \
2455 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2456 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2458 BRIDGE_UNLOCK(sc); \
2464 * Unicast. Make sure it's not for the bridge.
2466 do { GRAB_OUR_PACKETS(bifp) } while (0);
2469 * Give a chance for ifp at first priority. This will help when the
2470 * packet comes through the interface like VLAN's with the same MACs
2471 * on several interfaces from the same bridge. This also will save
2472 * some CPU cycles in case the destination interface and the input
2473 * interface (eq ifp) are the same.
2475 do { GRAB_OUR_PACKETS(ifp) } while (0);
2477 /* Now check the all bridge members. */
2478 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2479 GRAB_OUR_PACKETS(bif2->bif_ifp)
2482 #undef OR_CARP_CHECK_WE_ARE_DST
2483 #undef OR_CARP_CHECK_WE_ARE_SRC
2484 #undef OR_PFIL_HOOKED_INET6
2485 #undef GRAB_OUR_PACKETS
2487 /* Perform the bridge forwarding function. */
2488 bridge_forward(sc, bif, m);
2496 * Send a frame to all interfaces that are members of
2497 * the bridge, except for the one on which the packet
2500 * NOTE: Releases the lock on return.
2503 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2504 struct mbuf *m, int runfilt)
2506 struct bridge_iflist *dbif, *sbif;
2508 struct ifnet *dst_if;
2509 int error = 0, used = 0, i;
2511 sbif = bridge_lookup_member_if(sc, src_if);
2513 BRIDGE_LOCK2REF(sc, error);
2519 /* Filter on the bridge interface before broadcasting */
2520 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2522 || PFIL_HOOKED(&V_inet6_pfil_hook)
2525 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2531 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2532 dst_if = dbif->bif_ifp;
2533 if (dst_if == src_if)
2536 /* Private segments can not talk to each other */
2537 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2540 if ((dbif->bif_flags & IFBIF_STP) &&
2541 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2544 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2545 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2548 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2551 if (LIST_NEXT(dbif, bif_next) == NULL) {
2555 mc = m_dup(m, M_NOWAIT);
2557 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2563 * Filter on the output interface. Pass a NULL bridge interface
2564 * pointer so we do not redundantly filter on the bridge for
2565 * each interface we broadcast on.
2567 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2569 || PFIL_HOOKED(&V_inet6_pfil_hook)
2573 /* Keep the layer3 header aligned */
2574 i = min(mc->m_pkthdr.len, max_protohdr);
2575 mc = m_copyup(mc, i, ETHER_ALIGN);
2577 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2581 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2587 bridge_enqueue(sc, dst_if, mc);
2599 * Duplicate a packet out one or more interfaces that are in span mode,
2600 * the original mbuf is unmodified.
2603 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2605 struct bridge_iflist *bif;
2606 struct ifnet *dst_if;
2609 if (LIST_EMPTY(&sc->sc_spanlist))
2612 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2613 dst_if = bif->bif_ifp;
2615 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2618 mc = m_copypacket(m, M_NOWAIT);
2620 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2624 bridge_enqueue(sc, dst_if, mc);
2631 * Add a bridge routing entry.
2634 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2635 struct bridge_iflist *bif, int setflags, uint8_t flags)
2637 struct bridge_rtnode *brt;
2640 BRIDGE_LOCK_ASSERT(sc);
2642 /* Check the source address is valid and not multicast. */
2643 if (ETHER_IS_MULTICAST(dst) ||
2644 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2645 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2648 /* 802.1p frames map to vlan 1 */
2653 * A route for this destination might already exist. If so,
2654 * update it, otherwise create a new one.
2656 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2657 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2658 sc->sc_brtexceeded++;
2661 /* Check per interface address limits (if enabled) */
2662 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2663 bif->bif_addrexceeded++;
2668 * Allocate a new bridge forwarding node, and
2669 * initialize the expiration time and Ethernet
2672 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2676 if (bif->bif_flags & IFBIF_STICKY)
2677 brt->brt_flags = IFBAF_STICKY;
2679 brt->brt_flags = IFBAF_DYNAMIC;
2681 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2682 brt->brt_vlan = vlan;
2684 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2685 uma_zfree(bridge_rtnode_zone, brt);
2692 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2693 brt->brt_dst != bif) {
2694 brt->brt_dst->bif_addrcnt--;
2696 brt->brt_dst->bif_addrcnt++;
2699 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2700 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2702 brt->brt_flags = flags;
2710 * Lookup the destination interface for an address.
2712 static struct ifnet *
2713 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2715 struct bridge_rtnode *brt;
2717 BRIDGE_LOCK_ASSERT(sc);
2719 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2722 return (brt->brt_ifp);
2728 * Trim the routine table so that we have a number
2729 * of routing entries less than or equal to the
2733 bridge_rttrim(struct bridge_softc *sc)
2735 struct bridge_rtnode *brt, *nbrt;
2737 BRIDGE_LOCK_ASSERT(sc);
2739 /* Make sure we actually need to do this. */
2740 if (sc->sc_brtcnt <= sc->sc_brtmax)
2743 /* Force an aging cycle; this might trim enough addresses. */
2745 if (sc->sc_brtcnt <= sc->sc_brtmax)
2748 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2749 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2750 bridge_rtnode_destroy(sc, brt);
2751 if (sc->sc_brtcnt <= sc->sc_brtmax)
2760 * Aging timer for the bridge.
2763 bridge_timer(void *arg)
2765 struct bridge_softc *sc = arg;
2767 BRIDGE_LOCK_ASSERT(sc);
2771 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2772 callout_reset(&sc->sc_brcallout,
2773 bridge_rtable_prune_period * hz, bridge_timer, sc);
2779 * Perform an aging cycle.
2782 bridge_rtage(struct bridge_softc *sc)
2784 struct bridge_rtnode *brt, *nbrt;
2786 BRIDGE_LOCK_ASSERT(sc);
2788 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2789 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2790 if (time_uptime >= brt->brt_expire)
2791 bridge_rtnode_destroy(sc, brt);
2799 * Remove all dynamic addresses from the bridge.
2802 bridge_rtflush(struct bridge_softc *sc, int full)
2804 struct bridge_rtnode *brt, *nbrt;
2806 BRIDGE_LOCK_ASSERT(sc);
2808 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2809 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2810 bridge_rtnode_destroy(sc, brt);
2817 * Remove an address from the table.
2820 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2822 struct bridge_rtnode *brt;
2825 BRIDGE_LOCK_ASSERT(sc);
2828 * If vlan is zero then we want to delete for all vlans so the lookup
2829 * may return more than one.
2831 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2832 bridge_rtnode_destroy(sc, brt);
2836 return (found ? 0 : ENOENT);
2842 * Delete routes to a speicifc member interface.
2845 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2847 struct bridge_rtnode *brt, *nbrt;
2849 BRIDGE_LOCK_ASSERT(sc);
2851 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2852 if (brt->brt_ifp == ifp && (full ||
2853 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2854 bridge_rtnode_destroy(sc, brt);
2859 * bridge_rtable_init:
2861 * Initialize the route table for this bridge.
2864 bridge_rtable_init(struct bridge_softc *sc)
2868 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2869 M_DEVBUF, M_WAITOK);
2871 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2872 LIST_INIT(&sc->sc_rthash[i]);
2874 sc->sc_rthash_key = arc4random();
2875 LIST_INIT(&sc->sc_rtlist);
2879 * bridge_rtable_fini:
2881 * Deconstruct the route table for this bridge.
2884 bridge_rtable_fini(struct bridge_softc *sc)
2887 KASSERT(sc->sc_brtcnt == 0,
2888 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2889 free(sc->sc_rthash, M_DEVBUF);
2893 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2894 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2896 #define mix(a, b, c) \
2898 a -= b; a -= c; a ^= (c >> 13); \
2899 b -= c; b -= a; b ^= (a << 8); \
2900 c -= a; c -= b; c ^= (b >> 13); \
2901 a -= b; a -= c; a ^= (c >> 12); \
2902 b -= c; b -= a; b ^= (a << 16); \
2903 c -= a; c -= b; c ^= (b >> 5); \
2904 a -= b; a -= c; a ^= (c >> 3); \
2905 b -= c; b -= a; b ^= (a << 10); \
2906 c -= a; c -= b; c ^= (b >> 15); \
2907 } while (/*CONSTCOND*/0)
2909 static __inline uint32_t
2910 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2912 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2923 return (c & BRIDGE_RTHASH_MASK);
2929 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2933 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2934 d = ((int)a[i]) - ((int)b[i]);
2941 * bridge_rtnode_lookup:
2943 * Look up a bridge route node for the specified destination. Compare the
2944 * vlan id or if zero then just return the first match.
2946 static struct bridge_rtnode *
2947 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2949 struct bridge_rtnode *brt;
2953 BRIDGE_LOCK_ASSERT(sc);
2955 hash = bridge_rthash(sc, addr);
2956 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2957 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2958 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2968 * bridge_rtnode_insert:
2970 * Insert the specified bridge node into the route table. We
2971 * assume the entry is not already in the table.
2974 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2976 struct bridge_rtnode *lbrt;
2980 BRIDGE_LOCK_ASSERT(sc);
2982 hash = bridge_rthash(sc, brt->brt_addr);
2984 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2986 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2991 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2992 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2995 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2998 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2999 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3002 lbrt = LIST_NEXT(lbrt, brt_hash);
3003 } while (lbrt != NULL);
3006 panic("bridge_rtnode_insert: impossible");
3010 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3017 * bridge_rtnode_destroy:
3019 * Destroy a bridge rtnode.
3022 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3024 BRIDGE_LOCK_ASSERT(sc);
3026 LIST_REMOVE(brt, brt_hash);
3028 LIST_REMOVE(brt, brt_list);
3030 brt->brt_dst->bif_addrcnt--;
3031 uma_zfree(bridge_rtnode_zone, brt);
3035 * bridge_rtable_expire:
3037 * Set the expiry time for all routes on an interface.
3040 bridge_rtable_expire(struct ifnet *ifp, int age)
3042 struct bridge_softc *sc = ifp->if_bridge;
3043 struct bridge_rtnode *brt;
3048 * If the age is zero then flush, otherwise set all the expiry times to
3049 * age for the interface
3052 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3054 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3055 /* Cap the expiry time to 'age' */
3056 if (brt->brt_ifp == ifp &&
3057 brt->brt_expire > time_uptime + age &&
3058 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3059 brt->brt_expire = time_uptime + age;
3066 * bridge_state_change:
3068 * Callback from the bridgestp code when a port changes states.
3071 bridge_state_change(struct ifnet *ifp, int state)
3073 struct bridge_softc *sc = ifp->if_bridge;
3074 static const char *stpstates[] = {
3083 CURVNET_SET(ifp->if_vnet);
3085 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3086 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3091 * Send bridge packets through pfil if they are one of the types pfil can deal
3092 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3093 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3097 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3099 int snap, error, i, hlen;
3100 struct ether_header *eh1, eh2;
3103 u_int16_t ether_type;
3106 error = -1; /* Default error if not error == 0 */
3109 /* we may return with the IP fields swapped, ensure its not shared */
3110 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3113 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3114 return (0); /* filtering is disabled */
3116 i = min((*mp)->m_pkthdr.len, max_protohdr);
3117 if ((*mp)->m_len < i) {
3118 *mp = m_pullup(*mp, i);
3120 printf("%s: m_pullup failed\n", __func__);
3125 eh1 = mtod(*mp, struct ether_header *);
3126 ether_type = ntohs(eh1->ether_type);
3129 * Check for SNAP/LLC.
3131 if (ether_type < ETHERMTU) {
3132 struct llc *llc2 = (struct llc *)(eh1 + 1);
3134 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3135 llc2->llc_dsap == LLC_SNAP_LSAP &&
3136 llc2->llc_ssap == LLC_SNAP_LSAP &&
3137 llc2->llc_control == LLC_UI) {
3138 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3144 * If we're trying to filter bridge traffic, don't look at anything
3145 * other than IP and ARP traffic. If the filter doesn't understand
3146 * IPv6, don't allow IPv6 through the bridge either. This is lame
3147 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3148 * but of course we don't have an AppleTalk filter to begin with.
3149 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3152 switch (ether_type) {
3154 case ETHERTYPE_REVARP:
3155 if (V_pfil_ipfw_arp == 0)
3156 return (0); /* Automatically pass */
3161 case ETHERTYPE_IPV6:
3166 * Check to see if the user wants to pass non-ip
3167 * packets, these will not be checked by pfil(9) and
3168 * passed unconditionally so the default is to drop.
3174 /* Run the packet through pfil before stripping link headers */
3175 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
3176 dir == PFIL_OUT && ifp != NULL) {
3178 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, 0,
3181 if (*mp == NULL || error != 0) /* packet consumed by filter */
3185 /* Strip off the Ethernet header and keep a copy. */
3186 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3187 m_adj(*mp, ETHER_HDR_LEN);
3189 /* Strip off snap header, if present */
3191 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3192 m_adj(*mp, sizeof(struct llc));
3196 * Check the IP header for alignment and errors
3198 if (dir == PFIL_IN) {
3199 switch (ether_type) {
3201 error = bridge_ip_checkbasic(mp);
3204 case ETHERTYPE_IPV6:
3205 error = bridge_ip6_checkbasic(mp);
3218 * Run the packet through pfil
3220 switch (ether_type) {
3223 * Run pfil on the member interface and the bridge, both can
3224 * be skipped by clearing pfil_member or pfil_bridge.
3227 * in_if -> bridge_if -> out_if
3229 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3230 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3233 if (*mp == NULL || error != 0) /* filter may consume */
3236 if (V_pfil_member && ifp != NULL)
3237 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3240 if (*mp == NULL || error != 0) /* filter may consume */
3243 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3244 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3247 if (*mp == NULL || error != 0) /* filter may consume */
3250 /* check if we need to fragment the packet */
3251 /* bridge_fragment generates a mbuf chain of packets */
3252 /* that already include eth headers */
3253 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3254 i = (*mp)->m_pkthdr.len;
3255 if (i > ifp->if_mtu) {
3256 error = bridge_fragment(ifp, mp, &eh2, snap,
3262 /* Recalculate the ip checksum. */
3263 ip = mtod(*mp, struct ip *);
3264 hlen = ip->ip_hl << 2;
3265 if (hlen < sizeof(struct ip))
3267 if (hlen > (*mp)->m_len) {
3268 if ((*mp = m_pullup(*mp, hlen)) == NULL)
3270 ip = mtod(*mp, struct ip *);
3275 if (hlen == sizeof(struct ip))
3276 ip->ip_sum = in_cksum_hdr(ip);
3278 ip->ip_sum = in_cksum(*mp, hlen);
3282 case ETHERTYPE_IPV6:
3283 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3284 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3287 if (*mp == NULL || error != 0) /* filter may consume */
3290 if (V_pfil_member && ifp != NULL)
3291 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3294 if (*mp == NULL || error != 0) /* filter may consume */
3297 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3298 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3315 * Finally, put everything back the way it was and return
3318 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3321 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3324 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3327 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3338 * Perform basic checks on header size since
3339 * pfil assumes ip_input has already processed
3340 * it for it. Cut-and-pasted from ip_input.c.
3341 * Given how simple the IPv6 version is,
3342 * does the IPv4 version really need to be
3345 * XXX Should we update ipstat here, or not?
3346 * XXX Right now we update ipstat but not
3350 bridge_ip_checkbasic(struct mbuf **mp)
3352 struct mbuf *m = *mp;
3360 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3361 if ((m = m_copyup(m, sizeof(struct ip),
3362 (max_linkhdr + 3) & ~3)) == NULL) {
3363 /* XXXJRT new stat, please */
3364 KMOD_IPSTAT_INC(ips_toosmall);
3367 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3368 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3369 KMOD_IPSTAT_INC(ips_toosmall);
3373 ip = mtod(m, struct ip *);
3374 if (ip == NULL) goto bad;
3376 if (ip->ip_v != IPVERSION) {
3377 KMOD_IPSTAT_INC(ips_badvers);
3380 hlen = ip->ip_hl << 2;
3381 if (hlen < sizeof(struct ip)) { /* minimum header length */
3382 KMOD_IPSTAT_INC(ips_badhlen);
3385 if (hlen > m->m_len) {
3386 if ((m = m_pullup(m, hlen)) == NULL) {
3387 KMOD_IPSTAT_INC(ips_badhlen);
3390 ip = mtod(m, struct ip *);
3391 if (ip == NULL) goto bad;
3394 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3395 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3397 if (hlen == sizeof(struct ip)) {
3398 sum = in_cksum_hdr(ip);
3400 sum = in_cksum(m, hlen);
3404 KMOD_IPSTAT_INC(ips_badsum);
3408 /* Retrieve the packet length. */
3409 len = ntohs(ip->ip_len);
3412 * Check for additional length bogosity
3415 KMOD_IPSTAT_INC(ips_badlen);
3420 * Check that the amount of data in the buffers
3421 * is as at least much as the IP header would have us expect.
3422 * Drop packet if shorter than we expect.
3424 if (m->m_pkthdr.len < len) {
3425 KMOD_IPSTAT_INC(ips_tooshort);
3429 /* Checks out, proceed */
3440 * Same as above, but for IPv6.
3441 * Cut-and-pasted from ip6_input.c.
3442 * XXX Should we update ip6stat, or not?
3445 bridge_ip6_checkbasic(struct mbuf **mp)
3447 struct mbuf *m = *mp;
3448 struct ip6_hdr *ip6;
3451 * If the IPv6 header is not aligned, slurp it up into a new
3452 * mbuf with space for link headers, in the event we forward
3453 * it. Otherwise, if it is aligned, make sure the entire base
3454 * IPv6 header is in the first mbuf of the chain.
3456 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3457 struct ifnet *inifp = m->m_pkthdr.rcvif;
3458 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3459 (max_linkhdr + 3) & ~3)) == NULL) {
3460 /* XXXJRT new stat, please */
3461 IP6STAT_INC(ip6s_toosmall);
3462 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3465 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3466 struct ifnet *inifp = m->m_pkthdr.rcvif;
3467 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3468 IP6STAT_INC(ip6s_toosmall);
3469 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3474 ip6 = mtod(m, struct ip6_hdr *);
3476 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3477 IP6STAT_INC(ip6s_badvers);
3478 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3482 /* Checks out, proceed */
3495 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3498 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3499 int snap, struct llc *llc)
3501 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3505 if (m->m_len < sizeof(struct ip) &&
3506 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3508 ip = mtod(m, struct ip *);
3510 m->m_pkthdr.csum_flags |= CSUM_IP;
3511 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3516 * Walk the chain and re-add the Ethernet header for
3519 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3520 nextpkt = mcur->m_nextpkt;
3521 mcur->m_nextpkt = NULL;
3523 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3527 mprev->m_nextpkt = nextpkt;
3530 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3533 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3537 mprev->m_nextpkt = nextpkt;
3540 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3543 * The previous two M_PREPEND could have inserted one or two
3544 * mbufs in front so we have to update the previous packet's
3547 mcur->m_nextpkt = nextpkt;
3549 mprev->m_nextpkt = mcur;
3551 /* The first mbuf in the original chain needs to be
3558 KMOD_IPSTAT_INC(ips_fragmented);
3562 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3563 m = mcur->m_nextpkt;
3570 bridge_linkstate(struct ifnet *ifp)
3572 struct bridge_softc *sc = ifp->if_bridge;
3573 struct bridge_iflist *bif;
3576 bif = bridge_lookup_member_if(sc, ifp);
3581 bridge_linkcheck(sc);
3584 bstp_linkstate(&bif->bif_stp);
3588 bridge_linkcheck(struct bridge_softc *sc)
3590 struct bridge_iflist *bif;
3591 int new_link, hasls;
3593 BRIDGE_LOCK_ASSERT(sc);
3594 new_link = LINK_STATE_DOWN;
3596 /* Our link is considered up if at least one of our ports is active */
3597 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3598 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3600 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3601 new_link = LINK_STATE_UP;
3605 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3606 /* If no interfaces support link-state then we default to up */
3607 new_link = LINK_STATE_UP;
3609 if_link_state_change(sc->sc_ifp, new_link);