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 heterogenous bridges).
77 #include <sys/cdefs.h>
78 __FBSDID("$FreeBSD$");
81 #include "opt_inet6.h"
83 #include <sys/param.h>
85 #include <sys/malloc.h>
86 #include <sys/protosw.h>
87 #include <sys/systm.h>
90 #include <sys/socket.h> /* for net/if.h */
91 #include <sys/sockio.h>
92 #include <sys/ctype.h> /* string functions */
93 #include <sys/kernel.h>
94 #include <sys/random.h>
95 #include <sys/syslog.h>
96 #include <sys/sysctl.h>
98 #include <sys/module.h>
100 #include <sys/proc.h>
101 #include <sys/lock.h>
102 #include <sys/mutex.h>
106 #include <net/if_clone.h>
107 #include <net/if_dl.h>
108 #include <net/if_types.h>
109 #include <net/if_var.h>
110 #include <net/pfil.h>
111 #include <net/vnet.h>
113 #include <netinet/in.h> /* for struct arpcom */
114 #include <netinet/in_systm.h>
115 #include <netinet/in_var.h>
116 #include <netinet/ip.h>
117 #include <netinet/ip_var.h>
119 #include <netinet/ip6.h>
120 #include <netinet6/ip6_var.h>
121 #include <netinet6/in6_ifattach.h>
123 #if defined(INET) || defined(INET6)
124 #include <netinet/ip_carp.h>
126 #include <machine/in_cksum.h>
127 #include <netinet/if_ether.h> /* for struct arpcom */
128 #include <net/bridgestp.h>
129 #include <net/if_bridgevar.h>
130 #include <net/if_llc.h>
131 #include <net/if_vlan_var.h>
133 #include <net/route.h>
136 * Size of the route hash table. Must be a power of two.
138 #ifndef BRIDGE_RTHASH_SIZE
139 #define BRIDGE_RTHASH_SIZE 1024
142 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
145 * Default maximum number of addresses to cache.
147 #ifndef BRIDGE_RTABLE_MAX
148 #define BRIDGE_RTABLE_MAX 2000
152 * Timeout (in seconds) for entries learned dynamically.
154 #ifndef BRIDGE_RTABLE_TIMEOUT
155 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
159 * Number of seconds between walks of the route list.
161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
162 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
166 * List of capabilities to possibly mask on the member interface.
168 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
171 * List of capabilities to strip
173 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
176 * Bridge interface list entry.
178 struct bridge_iflist {
179 LIST_ENTRY(bridge_iflist) bif_next;
180 struct ifnet *bif_ifp; /* member if */
181 struct bstp_port bif_stp; /* STP state */
182 uint32_t bif_flags; /* member if flags */
183 int bif_savedcaps; /* saved capabilities */
184 uint32_t bif_addrmax; /* max # of addresses */
185 uint32_t bif_addrcnt; /* cur. # of addresses */
186 uint32_t bif_addrexceeded;/* # of address violations */
192 struct bridge_rtnode {
193 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
194 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
195 struct bridge_iflist *brt_dst; /* destination if */
196 unsigned long brt_expire; /* expiration time */
197 uint8_t brt_flags; /* address flags */
198 uint8_t brt_addr[ETHER_ADDR_LEN];
199 uint16_t brt_vlan; /* vlan id */
201 #define brt_ifp brt_dst->bif_ifp
204 * Software state for each bridge.
206 struct bridge_softc {
207 struct ifnet *sc_ifp; /* make this an interface */
208 LIST_ENTRY(bridge_softc) sc_list;
211 uint32_t sc_brtmax; /* max # of addresses */
212 uint32_t sc_brtcnt; /* cur. # of addresses */
213 uint32_t sc_brttimeout; /* rt timeout in seconds */
214 struct callout sc_brcallout; /* bridge callout */
215 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
216 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
217 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
218 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
219 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
220 uint32_t sc_rthash_key; /* key for hash */
221 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
222 struct bstp_state sc_stp; /* STP state */
223 uint32_t sc_brtexceeded; /* # of cache drops */
224 struct ifnet *sc_ifaddr; /* member mac copied from */
225 u_char sc_defaddr[6]; /* Default MAC address */
228 static struct mtx bridge_list_mtx;
229 eventhandler_tag bridge_detach_cookie = NULL;
231 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
233 uma_zone_t bridge_rtnode_zone;
235 static int bridge_clone_create(struct if_clone *, int, caddr_t);
236 static void bridge_clone_destroy(struct ifnet *);
238 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
239 static void bridge_mutecaps(struct bridge_softc *);
240 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
242 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
243 static void bridge_init(void *);
244 static void bridge_dummynet(struct mbuf *, struct ifnet *);
245 static void bridge_stop(struct ifnet *, int);
246 static int bridge_transmit(struct ifnet *, struct mbuf *);
247 static void bridge_qflush(struct ifnet *);
248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
249 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
251 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
253 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
255 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
258 static void bridge_timer(void *);
260 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
262 static void bridge_span(struct bridge_softc *, struct mbuf *);
264 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
265 uint16_t, struct bridge_iflist *, int, uint8_t);
266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
268 static void bridge_rttrim(struct bridge_softc *);
269 static void bridge_rtage(struct bridge_softc *);
270 static void bridge_rtflush(struct bridge_softc *, int);
271 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
274 static void bridge_rtable_init(struct bridge_softc *);
275 static void bridge_rtable_fini(struct bridge_softc *);
277 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
279 const uint8_t *, uint16_t);
280 static int bridge_rtnode_insert(struct bridge_softc *,
281 struct bridge_rtnode *);
282 static void bridge_rtnode_destroy(struct bridge_softc *,
283 struct bridge_rtnode *);
284 static void bridge_rtable_expire(struct ifnet *, int);
285 static void bridge_state_change(struct ifnet *, int);
287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
291 static void bridge_delete_member(struct bridge_softc *,
292 struct bridge_iflist *, int);
293 static void bridge_delete_span(struct bridge_softc *,
294 struct bridge_iflist *);
296 static int bridge_ioctl_add(struct bridge_softc *, void *);
297 static int bridge_ioctl_del(struct bridge_softc *, void *);
298 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
299 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
300 static int bridge_ioctl_scache(struct bridge_softc *, void *);
301 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
302 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
303 static int bridge_ioctl_rts(struct bridge_softc *, void *);
304 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
305 static int bridge_ioctl_sto(struct bridge_softc *, void *);
306 static int bridge_ioctl_gto(struct bridge_softc *, void *);
307 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
308 static int bridge_ioctl_flush(struct bridge_softc *, void *);
309 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
310 static int bridge_ioctl_spri(struct bridge_softc *, void *);
311 static int bridge_ioctl_ght(struct bridge_softc *, void *);
312 static int bridge_ioctl_sht(struct bridge_softc *, void *);
313 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
314 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
315 static int bridge_ioctl_gma(struct bridge_softc *, void *);
316 static int bridge_ioctl_sma(struct bridge_softc *, void *);
317 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
318 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
319 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
320 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
321 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
322 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
323 static int bridge_ioctl_grte(struct bridge_softc *, void *);
324 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
325 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
326 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
327 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
329 static int bridge_ip_checkbasic(struct mbuf **mp);
331 static int bridge_ip6_checkbasic(struct mbuf **mp);
333 static int bridge_fragment(struct ifnet *, struct mbuf *,
334 struct ether_header *, int, struct llc *);
335 static void bridge_linkstate(struct ifnet *ifp);
336 static void bridge_linkcheck(struct bridge_softc *sc);
338 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
340 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
341 #define VLANTAGOF(_m) \
342 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
344 static struct bstp_cb_ops bridge_ops = {
345 .bcb_state = bridge_state_change,
346 .bcb_rtage = bridge_rtable_expire
349 SYSCTL_DECL(_net_link);
350 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
352 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
353 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
354 static int pfil_member = 1; /* run pfil hooks on the member interface */
355 static int pfil_ipfw = 0; /* layer2 filter with ipfw */
356 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */
357 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
358 locally destined packets */
359 static int log_stp = 0; /* log STP state changes */
360 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */
361 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
363 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
364 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
365 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
366 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
367 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
369 &pfil_bridge, 0, "Packet filter on the bridge interface");
370 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
371 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
372 &pfil_member, 0, "Packet filter on the member interface");
373 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
374 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
376 "Packet filter on the physical interface for locally destined packets");
377 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
378 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
379 &log_stp, 0, "Log STP state changes");
380 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
381 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
382 &bridge_inherit_mac, 0,
383 "Inherit MAC address from the first bridge member");
385 static VNET_DEFINE(int, allow_llz_overlap) = 0;
386 #define V_allow_llz_overlap VNET(allow_llz_overlap)
387 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
388 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
389 "zones of a bridge interface and the member interfaces");
391 struct bridge_control {
392 int (*bc_func)(struct bridge_softc *, void *);
397 #define BC_F_COPYIN 0x01 /* copy arguments in */
398 #define BC_F_COPYOUT 0x02 /* copy arguments out */
399 #define BC_F_SUSER 0x04 /* do super-user check */
401 const struct bridge_control bridge_control_table[] = {
402 { bridge_ioctl_add, sizeof(struct ifbreq),
403 BC_F_COPYIN|BC_F_SUSER },
404 { bridge_ioctl_del, sizeof(struct ifbreq),
405 BC_F_COPYIN|BC_F_SUSER },
407 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
408 BC_F_COPYIN|BC_F_COPYOUT },
409 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
410 BC_F_COPYIN|BC_F_SUSER },
412 { bridge_ioctl_scache, sizeof(struct ifbrparam),
413 BC_F_COPYIN|BC_F_SUSER },
414 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
417 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
418 BC_F_COPYIN|BC_F_COPYOUT },
419 { bridge_ioctl_rts, sizeof(struct ifbaconf),
420 BC_F_COPYIN|BC_F_COPYOUT },
422 { bridge_ioctl_saddr, sizeof(struct ifbareq),
423 BC_F_COPYIN|BC_F_SUSER },
425 { bridge_ioctl_sto, sizeof(struct ifbrparam),
426 BC_F_COPYIN|BC_F_SUSER },
427 { bridge_ioctl_gto, sizeof(struct ifbrparam),
430 { bridge_ioctl_daddr, sizeof(struct ifbareq),
431 BC_F_COPYIN|BC_F_SUSER },
433 { bridge_ioctl_flush, sizeof(struct ifbreq),
434 BC_F_COPYIN|BC_F_SUSER },
436 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
438 { bridge_ioctl_spri, sizeof(struct ifbrparam),
439 BC_F_COPYIN|BC_F_SUSER },
441 { bridge_ioctl_ght, sizeof(struct ifbrparam),
443 { bridge_ioctl_sht, sizeof(struct ifbrparam),
444 BC_F_COPYIN|BC_F_SUSER },
446 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
448 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
449 BC_F_COPYIN|BC_F_SUSER },
451 { bridge_ioctl_gma, sizeof(struct ifbrparam),
453 { bridge_ioctl_sma, sizeof(struct ifbrparam),
454 BC_F_COPYIN|BC_F_SUSER },
456 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
457 BC_F_COPYIN|BC_F_SUSER },
459 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
460 BC_F_COPYIN|BC_F_SUSER },
462 { bridge_ioctl_addspan, sizeof(struct ifbreq),
463 BC_F_COPYIN|BC_F_SUSER },
464 { bridge_ioctl_delspan, sizeof(struct ifbreq),
465 BC_F_COPYIN|BC_F_SUSER },
467 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
470 { bridge_ioctl_grte, sizeof(struct ifbrparam),
473 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
474 BC_F_COPYIN|BC_F_COPYOUT },
476 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
477 BC_F_COPYIN|BC_F_SUSER },
479 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
480 BC_F_COPYIN|BC_F_SUSER },
482 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
483 BC_F_COPYIN|BC_F_SUSER },
486 const int bridge_control_table_size =
487 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
489 LIST_HEAD(, bridge_softc) bridge_list;
491 static struct if_clone *bridge_cloner;
492 static const char bridge_name[] = "bridge";
495 bridge_modevent(module_t mod, int type, void *data)
500 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
501 bridge_cloner = if_clone_simple(bridge_name,
502 bridge_clone_create, bridge_clone_destroy, 0);
503 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
504 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
506 LIST_INIT(&bridge_list);
507 bridge_input_p = bridge_input;
508 bridge_output_p = bridge_output;
509 bridge_dn_p = bridge_dummynet;
510 bridge_linkstate_p = bridge_linkstate;
511 bridge_detach_cookie = EVENTHANDLER_REGISTER(
512 ifnet_departure_event, bridge_ifdetach, NULL,
513 EVENTHANDLER_PRI_ANY);
516 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
517 bridge_detach_cookie);
518 if_clone_detach(bridge_cloner);
519 uma_zdestroy(bridge_rtnode_zone);
520 bridge_input_p = NULL;
521 bridge_output_p = NULL;
523 bridge_linkstate_p = NULL;
524 mtx_destroy(&bridge_list_mtx);
532 static moduledata_t bridge_mod = {
538 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
539 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
542 * handler for net.link.bridge.ipfw
545 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
547 int enable = pfil_ipfw;
550 error = sysctl_handle_int(oidp, &enable, 0, req);
551 enable = (enable) ? 1 : 0;
553 if (enable != pfil_ipfw) {
557 * Disable pfil so that ipfw doesnt run twice, if the user
558 * really wants both then they can re-enable pfil_bridge and/or
559 * pfil_member. Also allow non-ip packets as ipfw can filter by
571 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
572 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
575 * bridge_clone_create:
577 * Create a new bridge instance.
580 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
582 struct bridge_softc *sc, *sc2;
583 struct ifnet *bifp, *ifp;
585 unsigned long hostid;
587 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
588 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
594 BRIDGE_LOCK_INIT(sc);
595 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
596 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
598 /* Initialize our routing table. */
599 bridge_rtable_init(sc);
601 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
603 LIST_INIT(&sc->sc_iflist);
604 LIST_INIT(&sc->sc_spanlist);
607 if_initname(ifp, bridge_name, unit);
608 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
609 ifp->if_ioctl = bridge_ioctl;
610 ifp->if_transmit = bridge_transmit;
611 ifp->if_qflush = bridge_qflush;
612 ifp->if_init = bridge_init;
613 ifp->if_type = IFT_BRIDGE;
616 * Generate an ethernet address with a locally administered address.
618 * Since we are using random ethernet addresses for the bridge, it is
619 * possible that we might have address collisions, so make sure that
620 * this hardware address isn't already in use on another bridge.
621 * The first try uses the hostid and falls back to arc4rand().
624 getcredhostid(curthread->td_ucred, &hostid);
626 if (fb || hostid == 0) {
627 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
628 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
629 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
631 sc->sc_defaddr[0] = 0x2;
632 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
633 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
634 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
635 sc->sc_defaddr[4] = hostid & 0xff;
636 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
641 mtx_lock(&bridge_list_mtx);
642 LIST_FOREACH(sc2, &bridge_list, sc_list) {
644 if (memcmp(sc->sc_defaddr,
645 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
650 mtx_unlock(&bridge_list_mtx);
651 } while (retry == 1);
653 bstp_attach(&sc->sc_stp, &bridge_ops);
654 ether_ifattach(ifp, sc->sc_defaddr);
655 /* Now undo some of the damage... */
656 ifp->if_baudrate = 0;
657 ifp->if_type = IFT_BRIDGE;
659 mtx_lock(&bridge_list_mtx);
660 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
661 mtx_unlock(&bridge_list_mtx);
667 * bridge_clone_destroy:
669 * Destroy a bridge instance.
672 bridge_clone_destroy(struct ifnet *ifp)
674 struct bridge_softc *sc = ifp->if_softc;
675 struct bridge_iflist *bif;
680 ifp->if_flags &= ~IFF_UP;
682 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
683 bridge_delete_member(sc, bif, 0);
685 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
686 bridge_delete_span(sc, bif);
691 callout_drain(&sc->sc_brcallout);
693 mtx_lock(&bridge_list_mtx);
694 LIST_REMOVE(sc, sc_list);
695 mtx_unlock(&bridge_list_mtx);
697 bstp_detach(&sc->sc_stp);
701 /* Tear down the routing table. */
702 bridge_rtable_fini(sc);
704 BRIDGE_LOCK_DESTROY(sc);
711 * Handle a control request from the operator.
714 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
716 struct bridge_softc *sc = ifp->if_softc;
717 struct ifreq *ifr = (struct ifreq *)data;
718 struct bridge_iflist *bif;
719 struct thread *td = curthread;
721 struct ifbreq ifbreq;
722 struct ifbifconf ifbifconf;
723 struct ifbareq ifbareq;
724 struct ifbaconf ifbaconf;
725 struct ifbrparam ifbrparam;
726 struct ifbropreq ifbropreq;
728 struct ifdrv *ifd = (struct ifdrv *) data;
729 const struct bridge_control *bc;
740 if (ifd->ifd_cmd >= bridge_control_table_size) {
744 bc = &bridge_control_table[ifd->ifd_cmd];
746 if (cmd == SIOCGDRVSPEC &&
747 (bc->bc_flags & BC_F_COPYOUT) == 0) {
751 else if (cmd == SIOCSDRVSPEC &&
752 (bc->bc_flags & BC_F_COPYOUT) != 0) {
757 if (bc->bc_flags & BC_F_SUSER) {
758 error = priv_check(td, PRIV_NET_BRIDGE);
763 if (ifd->ifd_len != bc->bc_argsize ||
764 ifd->ifd_len > sizeof(args)) {
769 bzero(&args, sizeof(args));
770 if (bc->bc_flags & BC_F_COPYIN) {
771 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
777 error = (*bc->bc_func)(sc, &args);
782 if (bc->bc_flags & BC_F_COPYOUT)
783 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
788 if (!(ifp->if_flags & IFF_UP) &&
789 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
791 * If interface is marked down and it is running,
792 * then stop and disable it.
797 } else if ((ifp->if_flags & IFF_UP) &&
798 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
800 * If interface is marked up and it is stopped, then
808 if (ifr->ifr_mtu < 576) {
812 if (LIST_EMPTY(&sc->sc_iflist)) {
813 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
817 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
818 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
819 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
820 " != %d\n", sc->sc_ifp->if_xname,
821 bif->bif_ifp->if_mtu,
822 bif->bif_ifp->if_xname, ifr->ifr_mtu);
828 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
833 * drop the lock as ether_ioctl() will call bridge_start() and
834 * cause the lock to be recursed.
836 error = ether_ioctl(ifp, cmd, data);
846 * Clear or restore unwanted capabilities on the member interface
849 bridge_mutecaps(struct bridge_softc *sc)
851 struct bridge_iflist *bif;
854 /* Initial bitmask of capabilities to test */
855 mask = BRIDGE_IFCAPS_MASK;
857 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
858 /* Every member must support it or its disabled */
859 mask &= bif->bif_savedcaps;
862 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
863 enabled = bif->bif_ifp->if_capenable;
864 enabled &= ~BRIDGE_IFCAPS_STRIP;
865 /* strip off mask bits and enable them again if allowed */
866 enabled &= ~BRIDGE_IFCAPS_MASK;
868 bridge_set_ifcap(sc, bif, enabled);
874 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
876 struct ifnet *ifp = bif->bif_ifp;
880 bzero(&ifr, sizeof(ifr));
881 ifr.ifr_reqcap = set;
883 if (ifp->if_capenable != set) {
884 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
886 if_printf(sc->sc_ifp,
887 "error setting interface capabilities on %s\n",
893 * bridge_lookup_member:
895 * Lookup a bridge member interface.
897 static struct bridge_iflist *
898 bridge_lookup_member(struct bridge_softc *sc, const char *name)
900 struct bridge_iflist *bif;
903 BRIDGE_LOCK_ASSERT(sc);
905 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
907 if (strcmp(ifp->if_xname, name) == 0)
915 * bridge_lookup_member_if:
917 * Lookup a bridge member interface by ifnet*.
919 static struct bridge_iflist *
920 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
922 struct bridge_iflist *bif;
924 BRIDGE_LOCK_ASSERT(sc);
926 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
927 if (bif->bif_ifp == member_ifp)
935 * bridge_delete_member:
937 * Delete the specified member interface.
940 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
943 struct ifnet *ifs = bif->bif_ifp;
944 struct ifnet *fif = NULL;
946 BRIDGE_LOCK_ASSERT(sc);
948 if (bif->bif_flags & IFBIF_STP)
949 bstp_disable(&bif->bif_stp);
951 ifs->if_bridge = NULL;
953 LIST_REMOVE(bif, bif_next);
957 * If removing the interface that gave the bridge its mac address, set
958 * the mac address of the bridge to the address of the next member, or
959 * to its default address if no members are left.
961 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
962 if (LIST_EMPTY(&sc->sc_iflist)) {
963 bcopy(sc->sc_defaddr,
964 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
965 sc->sc_ifaddr = NULL;
967 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
968 bcopy(IF_LLADDR(fif),
969 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
972 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
975 bridge_linkcheck(sc);
976 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
977 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
978 KASSERT(bif->bif_addrcnt == 0,
979 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
983 switch (ifs->if_type) {
987 * Take the interface out of promiscuous mode.
989 (void) ifpromisc(ifs, 0);
997 panic("bridge_delete_member: impossible");
1001 /* reneable any interface capabilities */
1002 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1004 bstp_destroy(&bif->bif_stp); /* prepare to free */
1006 free(bif, M_DEVBUF);
1010 * bridge_delete_span:
1012 * Delete the specified span interface.
1015 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1017 BRIDGE_LOCK_ASSERT(sc);
1019 KASSERT(bif->bif_ifp->if_bridge == NULL,
1020 ("%s: not a span interface", __func__));
1022 LIST_REMOVE(bif, bif_next);
1023 free(bif, M_DEVBUF);
1027 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1029 struct ifbreq *req = arg;
1030 struct bridge_iflist *bif = NULL;
1034 ifs = ifunit(req->ifbr_ifsname);
1037 if (ifs->if_ioctl == NULL) /* must be supported */
1040 /* If it's in the span list, it can't be a member. */
1041 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1042 if (ifs == bif->bif_ifp)
1045 if (ifs->if_bridge == sc)
1048 if (ifs->if_bridge != NULL)
1051 switch (ifs->if_type) {
1055 /* permitted interface types */
1063 * Two valid inet6 addresses with link-local scope must not be
1064 * on the parent interface and the member interfaces at the
1065 * same time. This restriction is needed to prevent violation
1066 * of link-local scope zone. Attempts to add a member
1067 * interface which has inet6 addresses when the parent has
1068 * inet6 triggers removal of all inet6 addresses on the member
1072 /* Check if the parent interface has a link-local scope addr. */
1073 if (V_allow_llz_overlap == 0 &&
1074 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1076 * If any, remove all inet6 addresses from the member
1080 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1081 if (in6ifa_llaonifp(bif->bif_ifp)) {
1083 in6_ifdetach(bif->bif_ifp);
1085 if_printf(sc->sc_ifp,
1086 "IPv6 addresses on %s have been removed "
1087 "before adding it as a member to prevent "
1088 "IPv6 address scope violation.\n",
1089 bif->bif_ifp->if_xname);
1093 if (in6ifa_llaonifp(ifs)) {
1097 if_printf(sc->sc_ifp,
1098 "IPv6 addresses on %s have been removed "
1099 "before adding it as a member to prevent "
1100 "IPv6 address scope violation.\n",
1105 /* Allow the first Ethernet member to define the MTU */
1106 if (LIST_EMPTY(&sc->sc_iflist))
1107 sc->sc_ifp->if_mtu = ifs->if_mtu;
1108 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1109 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1110 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1114 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1119 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1120 bif->bif_savedcaps = ifs->if_capenable;
1123 * Assign the interface's MAC address to the bridge if it's the first
1124 * member and the MAC address of the bridge has not been changed from
1125 * the default randomly generated one.
1127 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1128 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1129 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1130 sc->sc_ifaddr = ifs;
1131 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1134 ifs->if_bridge = sc;
1135 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1137 * XXX: XLOCK HERE!?!
1139 * NOTE: insert_***HEAD*** should be safe for the traversals.
1141 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1143 /* Set interface capabilities to the intersection set of all members */
1144 bridge_mutecaps(sc);
1145 bridge_linkcheck(sc);
1147 /* Place the interface into promiscuous mode */
1148 switch (ifs->if_type) {
1152 error = ifpromisc(ifs, 1);
1158 bridge_delete_member(sc, bif, 0);
1159 free(bif, M_DEVBUF);
1165 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1167 struct ifbreq *req = arg;
1168 struct bridge_iflist *bif;
1170 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1174 bridge_delete_member(sc, bif, 0);
1180 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1182 struct ifbreq *req = arg;
1183 struct bridge_iflist *bif;
1184 struct bstp_port *bp;
1186 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1191 req->ifbr_ifsflags = bif->bif_flags;
1192 req->ifbr_state = bp->bp_state;
1193 req->ifbr_priority = bp->bp_priority;
1194 req->ifbr_path_cost = bp->bp_path_cost;
1195 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1196 req->ifbr_proto = bp->bp_protover;
1197 req->ifbr_role = bp->bp_role;
1198 req->ifbr_stpflags = bp->bp_flags;
1199 req->ifbr_addrcnt = bif->bif_addrcnt;
1200 req->ifbr_addrmax = bif->bif_addrmax;
1201 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1203 /* Copy STP state options as flags */
1204 if (bp->bp_operedge)
1205 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1206 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1207 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1208 if (bp->bp_ptp_link)
1209 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1210 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1211 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1212 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1213 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1214 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1215 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1220 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1222 struct ifbreq *req = arg;
1223 struct bridge_iflist *bif;
1224 struct bstp_port *bp;
1227 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1232 if (req->ifbr_ifsflags & IFBIF_SPAN)
1233 /* SPAN is readonly */
1236 if (req->ifbr_ifsflags & IFBIF_STP) {
1237 if ((bif->bif_flags & IFBIF_STP) == 0) {
1238 error = bstp_enable(&bif->bif_stp);
1243 if ((bif->bif_flags & IFBIF_STP) != 0)
1244 bstp_disable(&bif->bif_stp);
1247 /* Pass on STP flags */
1248 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1249 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1250 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1251 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1253 /* Save the bits relating to the bridge */
1254 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1260 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1262 struct ifbrparam *param = arg;
1264 sc->sc_brtmax = param->ifbrp_csize;
1271 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1273 struct ifbrparam *param = arg;
1275 param->ifbrp_csize = sc->sc_brtmax;
1281 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1283 struct ifbifconf *bifc = arg;
1284 struct bridge_iflist *bif;
1287 int count, buflen, len, error = 0;
1290 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1292 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1295 buflen = sizeof(breq) * count;
1296 if (bifc->ifbic_len == 0) {
1297 bifc->ifbic_len = buflen;
1301 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1306 len = min(bifc->ifbic_len, buflen);
1307 bzero(&breq, sizeof(breq));
1308 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1309 if (len < sizeof(breq))
1312 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1313 sizeof(breq.ifbr_ifsname));
1314 /* Fill in the ifbreq structure */
1315 error = bridge_ioctl_gifflags(sc, &breq);
1318 memcpy(buf, &breq, sizeof(breq));
1320 buf += sizeof(breq);
1321 len -= sizeof(breq);
1323 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1324 if (len < sizeof(breq))
1327 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1328 sizeof(breq.ifbr_ifsname));
1329 breq.ifbr_ifsflags = bif->bif_flags;
1330 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1331 memcpy(buf, &breq, sizeof(breq));
1333 buf += sizeof(breq);
1334 len -= sizeof(breq);
1338 bifc->ifbic_len = sizeof(breq) * count;
1339 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1341 free(outbuf, M_TEMP);
1346 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1348 struct ifbaconf *bac = arg;
1349 struct bridge_rtnode *brt;
1350 struct ifbareq bareq;
1352 int count, buflen, len, error = 0;
1354 if (bac->ifbac_len == 0)
1358 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1360 buflen = sizeof(bareq) * count;
1363 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1368 len = min(bac->ifbac_len, buflen);
1369 bzero(&bareq, sizeof(bareq));
1370 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1371 if (len < sizeof(bareq))
1373 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1374 sizeof(bareq.ifba_ifsname));
1375 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1376 bareq.ifba_vlan = brt->brt_vlan;
1377 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1378 time_uptime < brt->brt_expire)
1379 bareq.ifba_expire = brt->brt_expire - time_uptime;
1381 bareq.ifba_expire = 0;
1382 bareq.ifba_flags = brt->brt_flags;
1384 memcpy(buf, &bareq, sizeof(bareq));
1386 buf += sizeof(bareq);
1387 len -= sizeof(bareq);
1391 bac->ifbac_len = sizeof(bareq) * count;
1392 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1394 free(outbuf, M_TEMP);
1399 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1401 struct ifbareq *req = arg;
1402 struct bridge_iflist *bif;
1405 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1409 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1416 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1418 struct ifbrparam *param = arg;
1420 sc->sc_brttimeout = param->ifbrp_ctime;
1425 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1427 struct ifbrparam *param = arg;
1429 param->ifbrp_ctime = sc->sc_brttimeout;
1434 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1436 struct ifbareq *req = arg;
1438 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1442 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1444 struct ifbreq *req = arg;
1446 bridge_rtflush(sc, req->ifbr_ifsflags);
1451 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1453 struct ifbrparam *param = arg;
1454 struct bstp_state *bs = &sc->sc_stp;
1456 param->ifbrp_prio = bs->bs_bridge_priority;
1461 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1463 struct ifbrparam *param = arg;
1465 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1469 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1471 struct ifbrparam *param = arg;
1472 struct bstp_state *bs = &sc->sc_stp;
1474 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1479 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1481 struct ifbrparam *param = arg;
1483 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1487 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1489 struct ifbrparam *param = arg;
1490 struct bstp_state *bs = &sc->sc_stp;
1492 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1497 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1499 struct ifbrparam *param = arg;
1501 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1505 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1507 struct ifbrparam *param = arg;
1508 struct bstp_state *bs = &sc->sc_stp;
1510 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1515 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1517 struct ifbrparam *param = arg;
1519 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1523 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1525 struct ifbreq *req = arg;
1526 struct bridge_iflist *bif;
1528 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1532 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1536 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1538 struct ifbreq *req = arg;
1539 struct bridge_iflist *bif;
1541 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1545 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1549 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1551 struct ifbreq *req = arg;
1552 struct bridge_iflist *bif;
1554 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1558 bif->bif_addrmax = req->ifbr_addrmax;
1563 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1565 struct ifbreq *req = arg;
1566 struct bridge_iflist *bif = NULL;
1569 ifs = ifunit(req->ifbr_ifsname);
1573 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1574 if (ifs == bif->bif_ifp)
1577 if (ifs->if_bridge != NULL)
1580 switch (ifs->if_type) {
1589 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1594 bif->bif_flags = IFBIF_SPAN;
1596 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1602 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1604 struct ifbreq *req = arg;
1605 struct bridge_iflist *bif;
1608 ifs = ifunit(req->ifbr_ifsname);
1612 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1613 if (ifs == bif->bif_ifp)
1619 bridge_delete_span(sc, bif);
1625 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1627 struct ifbropreq *req = arg;
1628 struct bstp_state *bs = &sc->sc_stp;
1629 struct bstp_port *root_port;
1631 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1632 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1633 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1635 root_port = bs->bs_root_port;
1636 if (root_port == NULL)
1637 req->ifbop_root_port = 0;
1639 req->ifbop_root_port = root_port->bp_ifp->if_index;
1641 req->ifbop_holdcount = bs->bs_txholdcount;
1642 req->ifbop_priority = bs->bs_bridge_priority;
1643 req->ifbop_protocol = bs->bs_protover;
1644 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1645 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1646 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1647 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1648 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1649 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1655 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1657 struct ifbrparam *param = arg;
1659 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1664 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1666 struct ifbpstpconf *bifstp = arg;
1667 struct bridge_iflist *bif;
1668 struct bstp_port *bp;
1669 struct ifbpstpreq bpreq;
1671 int count, buflen, len, error = 0;
1674 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1675 if ((bif->bif_flags & IFBIF_STP) != 0)
1679 buflen = sizeof(bpreq) * count;
1680 if (bifstp->ifbpstp_len == 0) {
1681 bifstp->ifbpstp_len = buflen;
1686 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1691 len = min(bifstp->ifbpstp_len, buflen);
1692 bzero(&bpreq, sizeof(bpreq));
1693 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1694 if (len < sizeof(bpreq))
1697 if ((bif->bif_flags & IFBIF_STP) == 0)
1701 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1702 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1703 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1704 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1705 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1706 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1708 memcpy(buf, &bpreq, sizeof(bpreq));
1710 buf += sizeof(bpreq);
1711 len -= sizeof(bpreq);
1715 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1716 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1718 free(outbuf, M_TEMP);
1723 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1725 struct ifbrparam *param = arg;
1727 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1731 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1733 struct ifbrparam *param = arg;
1735 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1741 * Detach an interface from a bridge. Called when a member
1742 * interface is detaching.
1745 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1747 struct bridge_softc *sc = ifp->if_bridge;
1748 struct bridge_iflist *bif;
1750 if (ifp->if_flags & IFF_RENAMING)
1753 /* Check if the interface is a bridge member */
1757 bif = bridge_lookup_member_if(sc, ifp);
1759 bridge_delete_member(sc, bif, 1);
1765 /* Check if the interface is a span port */
1766 mtx_lock(&bridge_list_mtx);
1767 LIST_FOREACH(sc, &bridge_list, sc_list) {
1769 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1770 if (ifp == bif->bif_ifp) {
1771 bridge_delete_span(sc, bif);
1777 mtx_unlock(&bridge_list_mtx);
1783 * Initialize a bridge interface.
1786 bridge_init(void *xsc)
1788 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1789 struct ifnet *ifp = sc->sc_ifp;
1791 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1795 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1798 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1799 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1807 * Stop the bridge interface.
1810 bridge_stop(struct ifnet *ifp, int disable)
1812 struct bridge_softc *sc = ifp->if_softc;
1814 BRIDGE_LOCK_ASSERT(sc);
1816 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1819 callout_stop(&sc->sc_brcallout);
1820 bstp_stop(&sc->sc_stp);
1822 bridge_rtflush(sc, IFBF_FLUSHDYN);
1824 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1830 * Enqueue a packet on a bridge member interface.
1834 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1840 /* We may be sending a fragment so traverse the mbuf */
1843 m->m_nextpkt = NULL;
1844 len = m->m_pkthdr.len;
1845 mflags = m->m_flags;
1848 * If underlying interface can not do VLAN tag insertion itself
1849 * then attach a packet tag that holds it.
1851 if ((m->m_flags & M_VLANTAG) &&
1852 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1853 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1856 "unable to prepend VLAN header\n");
1857 dst_ifp->if_oerrors++;
1860 m->m_flags &= ~M_VLANTAG;
1863 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1865 sc->sc_ifp->if_oerrors++;
1869 sc->sc_ifp->if_opackets++;
1870 sc->sc_ifp->if_obytes += len;
1871 if (mflags & M_MCAST)
1872 sc->sc_ifp->if_omcasts++;
1881 * Receive a queued packet from dummynet and pass it on to the output
1884 * The mbuf has the Ethernet header already attached.
1887 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1889 struct bridge_softc *sc;
1891 sc = ifp->if_bridge;
1894 * The packet didnt originate from a member interface. This should only
1895 * ever happen if a member interface is removed while packets are
1903 if (PFIL_HOOKED(&V_inet_pfil_hook)
1905 || PFIL_HOOKED(&V_inet6_pfil_hook)
1908 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1914 bridge_enqueue(sc, ifp, m);
1920 * Send output from a bridge member interface. This
1921 * performs the bridging function for locally originated
1924 * The mbuf has the Ethernet header already attached. We must
1925 * enqueue or free the mbuf before returning.
1928 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1931 struct ether_header *eh;
1932 struct ifnet *dst_if;
1933 struct bridge_softc *sc;
1936 if (m->m_len < ETHER_HDR_LEN) {
1937 m = m_pullup(m, ETHER_HDR_LEN);
1942 eh = mtod(m, struct ether_header *);
1943 sc = ifp->if_bridge;
1944 vlan = VLANTAGOF(m);
1949 * If bridge is down, but the original output interface is up,
1950 * go ahead and send out that interface. Otherwise, the packet
1953 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1959 * If the packet is a multicast, or we don't know a better way to
1960 * get there, send to all interfaces.
1962 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1965 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1966 if (dst_if == NULL) {
1967 struct bridge_iflist *bif;
1969 int error = 0, used = 0;
1973 BRIDGE_LOCK2REF(sc, error);
1979 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1980 dst_if = bif->bif_ifp;
1982 if (dst_if->if_type == IFT_GIF)
1984 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1988 * If this is not the original output interface,
1989 * and the interface is participating in spanning
1990 * tree, make sure the port is in a state that
1991 * allows forwarding.
1993 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1994 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1997 if (LIST_NEXT(bif, bif_next) == NULL) {
2001 mc = m_copypacket(m, M_NOWAIT);
2003 sc->sc_ifp->if_oerrors++;
2008 bridge_enqueue(sc, dst_if, mc);
2018 * XXX Spanning tree consideration here?
2022 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2029 bridge_enqueue(sc, dst_if, m);
2036 * Do output on a bridge.
2040 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2042 struct bridge_softc *sc;
2043 struct ether_header *eh;
2044 struct ifnet *dst_if;
2049 ETHER_BPF_MTAP(ifp, m);
2051 eh = mtod(m, struct ether_header *);
2054 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2055 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2057 error = bridge_enqueue(sc, dst_if, m);
2059 bridge_broadcast(sc, ifp, m, 0);
2065 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2068 bridge_qflush(struct ifnet *ifp __unused)
2075 * The forwarding function of the bridge.
2077 * NOTE: Releases the lock on return.
2080 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2083 struct bridge_iflist *dbif;
2084 struct ifnet *src_if, *dst_if, *ifp;
2085 struct ether_header *eh;
2090 src_if = m->m_pkthdr.rcvif;
2094 ifp->if_ibytes += m->m_pkthdr.len;
2095 vlan = VLANTAGOF(m);
2097 if ((sbif->bif_flags & IFBIF_STP) &&
2098 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2101 eh = mtod(m, struct ether_header *);
2102 dst = eh->ether_dhost;
2104 /* If the interface is learning, record the address. */
2105 if (sbif->bif_flags & IFBIF_LEARNING) {
2106 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2107 sbif, 0, IFBAF_DYNAMIC);
2109 * If the interface has addresses limits then deny any source
2110 * that is not in the cache.
2112 if (error && sbif->bif_addrmax)
2116 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2117 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2121 * At this point, the port either doesn't participate
2122 * in spanning tree or it is in the forwarding state.
2126 * If the packet is unicast, destined for someone on
2127 * "this" side of the bridge, drop it.
2129 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2130 dst_if = bridge_rtlookup(sc, dst, vlan);
2131 if (src_if == dst_if)
2135 * Check if its a reserved multicast address, any address
2136 * listed in 802.1D section 7.12.6 may not be forwarded by the
2138 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2140 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2141 dst[2] == 0xc2 && dst[3] == 0x00 &&
2142 dst[4] == 0x00 && dst[5] <= 0x0f)
2145 /* ...forward it to all interfaces. */
2151 * If we have a destination interface which is a member of our bridge,
2152 * OR this is a unicast packet, push it through the bpf(4) machinery.
2153 * For broadcast or multicast packets, don't bother because it will
2154 * be reinjected into ether_input. We do this before we pass the packets
2155 * through the pfil(9) framework, as it is possible that pfil(9) will
2156 * drop the packet, or possibly modify it, making it difficult to debug
2157 * firewall issues on the bridge.
2159 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2160 ETHER_BPF_MTAP(ifp, m);
2162 /* run the packet filter */
2163 if (PFIL_HOOKED(&V_inet_pfil_hook)
2165 || PFIL_HOOKED(&V_inet6_pfil_hook)
2169 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2176 if (dst_if == NULL) {
2177 bridge_broadcast(sc, src_if, m, 1);
2182 * At this point, we're dealing with a unicast frame
2183 * going to a different interface.
2185 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2188 dbif = bridge_lookup_member_if(sc, dst_if);
2190 /* Not a member of the bridge (anymore?) */
2193 /* Private segments can not talk to each other */
2194 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2197 if ((dbif->bif_flags & IFBIF_STP) &&
2198 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2203 if (PFIL_HOOKED(&V_inet_pfil_hook)
2205 || PFIL_HOOKED(&V_inet6_pfil_hook)
2208 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2214 bridge_enqueue(sc, dst_if, m);
2225 * Receive input from a member interface. Queue the packet for
2226 * bridging if it is not for us.
2228 static struct mbuf *
2229 bridge_input(struct ifnet *ifp, struct mbuf *m)
2231 struct bridge_softc *sc = ifp->if_bridge;
2232 struct bridge_iflist *bif, *bif2;
2234 struct ether_header *eh;
2235 struct mbuf *mc, *mc2;
2239 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2243 vlan = VLANTAGOF(m);
2246 * Implement support for bridge monitoring. If this flag has been
2247 * set on this interface, discard the packet once we push it through
2248 * the bpf(4) machinery, but before we do, increment the byte and
2249 * packet counters associated with this interface.
2251 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2252 m->m_pkthdr.rcvif = bifp;
2253 ETHER_BPF_MTAP(bifp, m);
2254 bifp->if_ipackets++;
2255 bifp->if_ibytes += m->m_pkthdr.len;
2260 bif = bridge_lookup_member_if(sc, ifp);
2266 eh = mtod(m, struct ether_header *);
2270 if (m->m_flags & (M_BCAST|M_MCAST)) {
2271 /* Tap off 802.1D packets; they do not get forwarded. */
2272 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2273 ETHER_ADDR_LEN) == 0) {
2274 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2279 if ((bif->bif_flags & IFBIF_STP) &&
2280 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2286 * Make a deep copy of the packet and enqueue the copy
2287 * for bridge processing; return the original packet for
2290 mc = m_dup(m, M_NOWAIT);
2296 /* Perform the bridge forwarding function with the copy. */
2297 bridge_forward(sc, bif, mc);
2300 * Reinject the mbuf as arriving on the bridge so we have a
2301 * chance at claiming multicast packets. We can not loop back
2302 * here from ether_input as a bridge is never a member of a
2305 KASSERT(bifp->if_bridge == NULL,
2306 ("loop created in bridge_input"));
2307 mc2 = m_dup(m, M_NOWAIT);
2309 /* Keep the layer3 header aligned */
2310 int i = min(mc2->m_pkthdr.len, max_protohdr);
2311 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2314 mc2->m_pkthdr.rcvif = bifp;
2315 (*bifp->if_input)(bifp, mc2);
2318 /* Return the original packet for local processing. */
2322 if ((bif->bif_flags & IFBIF_STP) &&
2323 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2328 #if (defined(INET) || defined(INET6))
2329 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2330 || ((iface)->if_carp \
2331 && (*carp_forus_p)((iface), eh->ether_dhost))
2332 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2333 || ((iface)->if_carp \
2334 && (*carp_forus_p)((iface), eh->ether_shost))
2336 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2337 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2341 # define OR_PFIL_HOOKED_INET6 \
2342 || PFIL_HOOKED(&V_inet6_pfil_hook)
2344 # define OR_PFIL_HOOKED_INET6
2347 #define GRAB_OUR_PACKETS(iface) \
2348 if ((iface)->if_type == IFT_GIF) \
2350 /* It is destined for us. */ \
2351 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2352 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2354 if ((iface)->if_type == IFT_BRIDGE) { \
2355 ETHER_BPF_MTAP(iface, m); \
2356 iface->if_ipackets++; \
2357 iface->if_ibytes += m->m_pkthdr.len; \
2358 /* Filter on the physical interface. */ \
2359 if (pfil_local_phys && \
2360 (PFIL_HOOKED(&V_inet_pfil_hook) \
2361 OR_PFIL_HOOKED_INET6)) { \
2362 if (bridge_pfil(&m, NULL, ifp, \
2363 PFIL_IN) != 0 || m == NULL) { \
2364 BRIDGE_UNLOCK(sc); \
2367 eh = mtod(m, struct ether_header *); \
2370 if (bif->bif_flags & IFBIF_LEARNING) { \
2371 error = bridge_rtupdate(sc, eh->ether_shost, \
2372 vlan, bif, 0, IFBAF_DYNAMIC); \
2373 if (error && bif->bif_addrmax) { \
2374 BRIDGE_UNLOCK(sc); \
2379 m->m_pkthdr.rcvif = iface; \
2380 BRIDGE_UNLOCK(sc); \
2384 /* We just received a packet that we sent out. */ \
2385 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2386 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2388 BRIDGE_UNLOCK(sc); \
2394 * Unicast. Make sure it's not for the bridge.
2396 do { GRAB_OUR_PACKETS(bifp) } while (0);
2399 * Give a chance for ifp at first priority. This will help when the
2400 * packet comes through the interface like VLAN's with the same MACs
2401 * on several interfaces from the same bridge. This also will save
2402 * some CPU cycles in case the destination interface and the input
2403 * interface (eq ifp) are the same.
2405 do { GRAB_OUR_PACKETS(ifp) } while (0);
2407 /* Now check the all bridge members. */
2408 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2409 GRAB_OUR_PACKETS(bif2->bif_ifp)
2412 #undef OR_CARP_CHECK_WE_ARE_DST
2413 #undef OR_CARP_CHECK_WE_ARE_SRC
2414 #undef OR_PFIL_HOOKED_INET6
2415 #undef GRAB_OUR_PACKETS
2417 /* Perform the bridge forwarding function. */
2418 bridge_forward(sc, bif, m);
2426 * Send a frame to all interfaces that are members of
2427 * the bridge, except for the one on which the packet
2430 * NOTE: Releases the lock on return.
2433 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2434 struct mbuf *m, int runfilt)
2436 struct bridge_iflist *dbif, *sbif;
2438 struct ifnet *dst_if;
2439 int error = 0, used = 0, i;
2441 sbif = bridge_lookup_member_if(sc, src_if);
2443 BRIDGE_LOCK2REF(sc, error);
2449 /* Filter on the bridge interface before broadcasting */
2450 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2452 || PFIL_HOOKED(&V_inet6_pfil_hook)
2455 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2461 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2462 dst_if = dbif->bif_ifp;
2463 if (dst_if == src_if)
2466 /* Private segments can not talk to each other */
2467 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2470 if ((dbif->bif_flags & IFBIF_STP) &&
2471 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2474 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2475 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2478 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2481 if (LIST_NEXT(dbif, bif_next) == NULL) {
2485 mc = m_dup(m, M_NOWAIT);
2487 sc->sc_ifp->if_oerrors++;
2493 * Filter on the output interface. Pass a NULL bridge interface
2494 * pointer so we do not redundantly filter on the bridge for
2495 * each interface we broadcast on.
2497 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2499 || PFIL_HOOKED(&V_inet6_pfil_hook)
2503 /* Keep the layer3 header aligned */
2504 i = min(mc->m_pkthdr.len, max_protohdr);
2505 mc = m_copyup(mc, i, ETHER_ALIGN);
2507 sc->sc_ifp->if_oerrors++;
2511 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2517 bridge_enqueue(sc, dst_if, mc);
2529 * Duplicate a packet out one or more interfaces that are in span mode,
2530 * the original mbuf is unmodified.
2533 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2535 struct bridge_iflist *bif;
2536 struct ifnet *dst_if;
2539 if (LIST_EMPTY(&sc->sc_spanlist))
2542 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2543 dst_if = bif->bif_ifp;
2545 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2548 mc = m_copypacket(m, M_NOWAIT);
2550 sc->sc_ifp->if_oerrors++;
2554 bridge_enqueue(sc, dst_if, mc);
2561 * Add a bridge routing entry.
2564 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2565 struct bridge_iflist *bif, int setflags, uint8_t flags)
2567 struct bridge_rtnode *brt;
2570 BRIDGE_LOCK_ASSERT(sc);
2572 /* Check the source address is valid and not multicast. */
2573 if (ETHER_IS_MULTICAST(dst) ||
2574 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2575 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2578 /* 802.1p frames map to vlan 1 */
2583 * A route for this destination might already exist. If so,
2584 * update it, otherwise create a new one.
2586 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2587 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2588 sc->sc_brtexceeded++;
2591 /* Check per interface address limits (if enabled) */
2592 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2593 bif->bif_addrexceeded++;
2598 * Allocate a new bridge forwarding node, and
2599 * initialize the expiration time and Ethernet
2602 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2606 if (bif->bif_flags & IFBIF_STICKY)
2607 brt->brt_flags = IFBAF_STICKY;
2609 brt->brt_flags = IFBAF_DYNAMIC;
2611 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2612 brt->brt_vlan = vlan;
2614 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2615 uma_zfree(bridge_rtnode_zone, brt);
2622 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2623 brt->brt_dst != bif) {
2624 brt->brt_dst->bif_addrcnt--;
2626 brt->brt_dst->bif_addrcnt++;
2629 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2630 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2632 brt->brt_flags = flags;
2640 * Lookup the destination interface for an address.
2642 static struct ifnet *
2643 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2645 struct bridge_rtnode *brt;
2647 BRIDGE_LOCK_ASSERT(sc);
2649 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2652 return (brt->brt_ifp);
2658 * Trim the routine table so that we have a number
2659 * of routing entries less than or equal to the
2663 bridge_rttrim(struct bridge_softc *sc)
2665 struct bridge_rtnode *brt, *nbrt;
2667 BRIDGE_LOCK_ASSERT(sc);
2669 /* Make sure we actually need to do this. */
2670 if (sc->sc_brtcnt <= sc->sc_brtmax)
2673 /* Force an aging cycle; this might trim enough addresses. */
2675 if (sc->sc_brtcnt <= sc->sc_brtmax)
2678 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2679 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2680 bridge_rtnode_destroy(sc, brt);
2681 if (sc->sc_brtcnt <= sc->sc_brtmax)
2690 * Aging timer for the bridge.
2693 bridge_timer(void *arg)
2695 struct bridge_softc *sc = arg;
2697 BRIDGE_LOCK_ASSERT(sc);
2701 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2702 callout_reset(&sc->sc_brcallout,
2703 bridge_rtable_prune_period * hz, bridge_timer, sc);
2709 * Perform an aging cycle.
2712 bridge_rtage(struct bridge_softc *sc)
2714 struct bridge_rtnode *brt, *nbrt;
2716 BRIDGE_LOCK_ASSERT(sc);
2718 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2719 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2720 if (time_uptime >= brt->brt_expire)
2721 bridge_rtnode_destroy(sc, brt);
2729 * Remove all dynamic addresses from the bridge.
2732 bridge_rtflush(struct bridge_softc *sc, int full)
2734 struct bridge_rtnode *brt, *nbrt;
2736 BRIDGE_LOCK_ASSERT(sc);
2738 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2739 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2740 bridge_rtnode_destroy(sc, brt);
2747 * Remove an address from the table.
2750 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2752 struct bridge_rtnode *brt;
2755 BRIDGE_LOCK_ASSERT(sc);
2758 * If vlan is zero then we want to delete for all vlans so the lookup
2759 * may return more than one.
2761 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2762 bridge_rtnode_destroy(sc, brt);
2766 return (found ? 0 : ENOENT);
2772 * Delete routes to a speicifc member interface.
2775 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2777 struct bridge_rtnode *brt, *nbrt;
2779 BRIDGE_LOCK_ASSERT(sc);
2781 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2782 if (brt->brt_ifp == ifp && (full ||
2783 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2784 bridge_rtnode_destroy(sc, brt);
2789 * bridge_rtable_init:
2791 * Initialize the route table for this bridge.
2794 bridge_rtable_init(struct bridge_softc *sc)
2798 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2799 M_DEVBUF, M_WAITOK);
2801 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2802 LIST_INIT(&sc->sc_rthash[i]);
2804 sc->sc_rthash_key = arc4random();
2805 LIST_INIT(&sc->sc_rtlist);
2809 * bridge_rtable_fini:
2811 * Deconstruct the route table for this bridge.
2814 bridge_rtable_fini(struct bridge_softc *sc)
2817 KASSERT(sc->sc_brtcnt == 0,
2818 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2819 free(sc->sc_rthash, M_DEVBUF);
2823 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2824 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2826 #define mix(a, b, c) \
2828 a -= b; a -= c; a ^= (c >> 13); \
2829 b -= c; b -= a; b ^= (a << 8); \
2830 c -= a; c -= b; c ^= (b >> 13); \
2831 a -= b; a -= c; a ^= (c >> 12); \
2832 b -= c; b -= a; b ^= (a << 16); \
2833 c -= a; c -= b; c ^= (b >> 5); \
2834 a -= b; a -= c; a ^= (c >> 3); \
2835 b -= c; b -= a; b ^= (a << 10); \
2836 c -= a; c -= b; c ^= (b >> 15); \
2837 } while (/*CONSTCOND*/0)
2839 static __inline uint32_t
2840 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2842 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2853 return (c & BRIDGE_RTHASH_MASK);
2859 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2863 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2864 d = ((int)a[i]) - ((int)b[i]);
2871 * bridge_rtnode_lookup:
2873 * Look up a bridge route node for the specified destination. Compare the
2874 * vlan id or if zero then just return the first match.
2876 static struct bridge_rtnode *
2877 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2879 struct bridge_rtnode *brt;
2883 BRIDGE_LOCK_ASSERT(sc);
2885 hash = bridge_rthash(sc, addr);
2886 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2887 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2888 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2898 * bridge_rtnode_insert:
2900 * Insert the specified bridge node into the route table. We
2901 * assume the entry is not already in the table.
2904 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2906 struct bridge_rtnode *lbrt;
2910 BRIDGE_LOCK_ASSERT(sc);
2912 hash = bridge_rthash(sc, brt->brt_addr);
2914 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2916 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2921 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2922 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2925 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2928 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2929 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2932 lbrt = LIST_NEXT(lbrt, brt_hash);
2933 } while (lbrt != NULL);
2936 panic("bridge_rtnode_insert: impossible");
2940 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2947 * bridge_rtnode_destroy:
2949 * Destroy a bridge rtnode.
2952 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2954 BRIDGE_LOCK_ASSERT(sc);
2956 LIST_REMOVE(brt, brt_hash);
2958 LIST_REMOVE(brt, brt_list);
2960 brt->brt_dst->bif_addrcnt--;
2961 uma_zfree(bridge_rtnode_zone, brt);
2965 * bridge_rtable_expire:
2967 * Set the expiry time for all routes on an interface.
2970 bridge_rtable_expire(struct ifnet *ifp, int age)
2972 struct bridge_softc *sc = ifp->if_bridge;
2973 struct bridge_rtnode *brt;
2978 * If the age is zero then flush, otherwise set all the expiry times to
2979 * age for the interface
2982 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2984 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2985 /* Cap the expiry time to 'age' */
2986 if (brt->brt_ifp == ifp &&
2987 brt->brt_expire > time_uptime + age &&
2988 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2989 brt->brt_expire = time_uptime + age;
2996 * bridge_state_change:
2998 * Callback from the bridgestp code when a port changes states.
3001 bridge_state_change(struct ifnet *ifp, int state)
3003 struct bridge_softc *sc = ifp->if_bridge;
3004 static const char *stpstates[] = {
3014 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3015 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3019 * Send bridge packets through pfil if they are one of the types pfil can deal
3020 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3021 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3025 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3027 int snap, error, i, hlen;
3028 struct ether_header *eh1, eh2;
3031 u_int16_t ether_type;
3034 error = -1; /* Default error if not error == 0 */
3037 /* we may return with the IP fields swapped, ensure its not shared */
3038 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3041 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
3042 return (0); /* filtering is disabled */
3044 i = min((*mp)->m_pkthdr.len, max_protohdr);
3045 if ((*mp)->m_len < i) {
3046 *mp = m_pullup(*mp, i);
3048 printf("%s: m_pullup failed\n", __func__);
3053 eh1 = mtod(*mp, struct ether_header *);
3054 ether_type = ntohs(eh1->ether_type);
3057 * Check for SNAP/LLC.
3059 if (ether_type < ETHERMTU) {
3060 struct llc *llc2 = (struct llc *)(eh1 + 1);
3062 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3063 llc2->llc_dsap == LLC_SNAP_LSAP &&
3064 llc2->llc_ssap == LLC_SNAP_LSAP &&
3065 llc2->llc_control == LLC_UI) {
3066 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3072 * If we're trying to filter bridge traffic, don't look at anything
3073 * other than IP and ARP traffic. If the filter doesn't understand
3074 * IPv6, don't allow IPv6 through the bridge either. This is lame
3075 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3076 * but of course we don't have an AppleTalk filter to begin with.
3077 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3080 switch (ether_type) {
3082 case ETHERTYPE_REVARP:
3083 if (pfil_ipfw_arp == 0)
3084 return (0); /* Automatically pass */
3089 case ETHERTYPE_IPV6:
3094 * Check to see if the user wants to pass non-ip
3095 * packets, these will not be checked by pfil(9) and
3096 * passed unconditionally so the default is to drop.
3102 /* Run the packet through pfil before stripping link headers */
3103 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 &&
3104 dir == PFIL_OUT && ifp != NULL) {
3106 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3108 if (*mp == NULL || error != 0) /* packet consumed by filter */
3112 /* Strip off the Ethernet header and keep a copy. */
3113 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3114 m_adj(*mp, ETHER_HDR_LEN);
3116 /* Strip off snap header, if present */
3118 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3119 m_adj(*mp, sizeof(struct llc));
3123 * Check the IP header for alignment and errors
3125 if (dir == PFIL_IN) {
3126 switch (ether_type) {
3128 error = bridge_ip_checkbasic(mp);
3131 case ETHERTYPE_IPV6:
3132 error = bridge_ip6_checkbasic(mp);
3145 * Run the packet through pfil
3147 switch (ether_type) {
3150 * Run pfil on the member interface and the bridge, both can
3151 * be skipped by clearing pfil_member or pfil_bridge.
3154 * in_if -> bridge_if -> out_if
3156 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3157 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3160 if (*mp == NULL || error != 0) /* filter may consume */
3163 if (pfil_member && ifp != NULL)
3164 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3167 if (*mp == NULL || error != 0) /* filter may consume */
3170 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3171 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3174 if (*mp == NULL || error != 0) /* filter may consume */
3177 /* check if we need to fragment the packet */
3178 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3179 i = (*mp)->m_pkthdr.len;
3180 if (i > ifp->if_mtu) {
3181 error = bridge_fragment(ifp, *mp, &eh2, snap,
3187 /* Recalculate the ip checksum. */
3188 ip = mtod(*mp, struct ip *);
3189 hlen = ip->ip_hl << 2;
3190 if (hlen < sizeof(struct ip))
3192 if (hlen > (*mp)->m_len) {
3193 if ((*mp = m_pullup(*mp, hlen)) == 0)
3195 ip = mtod(*mp, struct ip *);
3200 if (hlen == sizeof(struct ip))
3201 ip->ip_sum = in_cksum_hdr(ip);
3203 ip->ip_sum = in_cksum(*mp, hlen);
3207 case ETHERTYPE_IPV6:
3208 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3209 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3212 if (*mp == NULL || error != 0) /* filter may consume */
3215 if (pfil_member && ifp != NULL)
3216 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3219 if (*mp == NULL || error != 0) /* filter may consume */
3222 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3223 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3240 * Finally, put everything back the way it was and return
3243 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3246 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3249 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3252 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3263 * Perform basic checks on header size since
3264 * pfil assumes ip_input has already processed
3265 * it for it. Cut-and-pasted from ip_input.c.
3266 * Given how simple the IPv6 version is,
3267 * does the IPv4 version really need to be
3270 * XXX Should we update ipstat here, or not?
3271 * XXX Right now we update ipstat but not
3275 bridge_ip_checkbasic(struct mbuf **mp)
3277 struct mbuf *m = *mp;
3285 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3286 if ((m = m_copyup(m, sizeof(struct ip),
3287 (max_linkhdr + 3) & ~3)) == NULL) {
3288 /* XXXJRT new stat, please */
3289 KMOD_IPSTAT_INC(ips_toosmall);
3292 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3293 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3294 KMOD_IPSTAT_INC(ips_toosmall);
3298 ip = mtod(m, struct ip *);
3299 if (ip == NULL) goto bad;
3301 if (ip->ip_v != IPVERSION) {
3302 KMOD_IPSTAT_INC(ips_badvers);
3305 hlen = ip->ip_hl << 2;
3306 if (hlen < sizeof(struct ip)) { /* minimum header length */
3307 KMOD_IPSTAT_INC(ips_badhlen);
3310 if (hlen > m->m_len) {
3311 if ((m = m_pullup(m, hlen)) == 0) {
3312 KMOD_IPSTAT_INC(ips_badhlen);
3315 ip = mtod(m, struct ip *);
3316 if (ip == NULL) goto bad;
3319 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3320 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3322 if (hlen == sizeof(struct ip)) {
3323 sum = in_cksum_hdr(ip);
3325 sum = in_cksum(m, hlen);
3329 KMOD_IPSTAT_INC(ips_badsum);
3333 /* Retrieve the packet length. */
3334 len = ntohs(ip->ip_len);
3337 * Check for additional length bogosity
3340 KMOD_IPSTAT_INC(ips_badlen);
3345 * Check that the amount of data in the buffers
3346 * is as at least much as the IP header would have us expect.
3347 * Drop packet if shorter than we expect.
3349 if (m->m_pkthdr.len < len) {
3350 KMOD_IPSTAT_INC(ips_tooshort);
3354 /* Checks out, proceed */
3365 * Same as above, but for IPv6.
3366 * Cut-and-pasted from ip6_input.c.
3367 * XXX Should we update ip6stat, or not?
3370 bridge_ip6_checkbasic(struct mbuf **mp)
3372 struct mbuf *m = *mp;
3373 struct ip6_hdr *ip6;
3376 * If the IPv6 header is not aligned, slurp it up into a new
3377 * mbuf with space for link headers, in the event we forward
3378 * it. Otherwise, if it is aligned, make sure the entire base
3379 * IPv6 header is in the first mbuf of the chain.
3381 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3382 struct ifnet *inifp = m->m_pkthdr.rcvif;
3383 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3384 (max_linkhdr + 3) & ~3)) == NULL) {
3385 /* XXXJRT new stat, please */
3386 IP6STAT_INC(ip6s_toosmall);
3387 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3390 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3391 struct ifnet *inifp = m->m_pkthdr.rcvif;
3392 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3393 IP6STAT_INC(ip6s_toosmall);
3394 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3399 ip6 = mtod(m, struct ip6_hdr *);
3401 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3402 IP6STAT_INC(ip6s_badvers);
3403 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3407 /* Checks out, proceed */
3420 * Return a fragmented mbuf chain.
3423 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3424 int snap, struct llc *llc)
3430 if (m->m_len < sizeof(struct ip) &&
3431 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3433 ip = mtod(m, struct ip *);
3435 m->m_pkthdr.csum_flags |= CSUM_IP;
3436 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3440 /* walk the chain and re-add the Ethernet header */
3441 for (m0 = m; m0; m0 = m0->m_nextpkt) {
3444 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT);
3449 bcopy(llc, mtod(m0, caddr_t),
3450 sizeof(struct llc));
3452 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT);
3457 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3463 KMOD_IPSTAT_INC(ips_fragmented);
3474 bridge_linkstate(struct ifnet *ifp)
3476 struct bridge_softc *sc = ifp->if_bridge;
3477 struct bridge_iflist *bif;
3480 bif = bridge_lookup_member_if(sc, ifp);
3485 bridge_linkcheck(sc);
3488 bstp_linkstate(&bif->bif_stp);
3492 bridge_linkcheck(struct bridge_softc *sc)
3494 struct bridge_iflist *bif;
3495 int new_link, hasls;
3497 BRIDGE_LOCK_ASSERT(sc);
3498 new_link = LINK_STATE_DOWN;
3500 /* Our link is considered up if at least one of our ports is active */
3501 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3502 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3504 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3505 new_link = LINK_STATE_UP;
3509 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3510 /* If no interfaces support link-state then we default to up */
3511 new_link = LINK_STATE_UP;
3513 if_link_state_change(sc->sc_ifp, new_link);