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|\
172 * List of capabilities to strip
174 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
177 * Bridge interface list entry.
179 struct bridge_iflist {
180 LIST_ENTRY(bridge_iflist) bif_next;
181 struct ifnet *bif_ifp; /* member if */
182 struct bstp_port bif_stp; /* STP state */
183 uint32_t bif_flags; /* member if flags */
184 int bif_savedcaps; /* saved capabilities */
185 uint32_t bif_addrmax; /* max # of addresses */
186 uint32_t bif_addrcnt; /* cur. # of addresses */
187 uint32_t bif_addrexceeded;/* # of address violations */
193 struct bridge_rtnode {
194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
196 struct bridge_iflist *brt_dst; /* destination if */
197 unsigned long brt_expire; /* expiration time */
198 uint8_t brt_flags; /* address flags */
199 uint8_t brt_addr[ETHER_ADDR_LEN];
200 uint16_t brt_vlan; /* vlan id */
202 #define brt_ifp brt_dst->bif_ifp
205 * Software state for each bridge.
207 struct bridge_softc {
208 struct ifnet *sc_ifp; /* make this an interface */
209 LIST_ENTRY(bridge_softc) sc_list;
212 uint32_t sc_brtmax; /* max # of addresses */
213 uint32_t sc_brtcnt; /* cur. # of addresses */
214 uint32_t sc_brttimeout; /* rt timeout in seconds */
215 struct callout sc_brcallout; /* bridge callout */
216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
221 uint32_t sc_rthash_key; /* key for hash */
222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
223 struct bstp_state sc_stp; /* STP state */
224 uint32_t sc_brtexceeded; /* # of cache drops */
225 struct ifnet *sc_ifaddr; /* member mac copied from */
226 u_char sc_defaddr[6]; /* Default MAC address */
229 static struct mtx bridge_list_mtx;
230 eventhandler_tag bridge_detach_cookie = NULL;
232 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
234 uma_zone_t bridge_rtnode_zone;
236 static int bridge_clone_create(struct if_clone *, int, caddr_t);
237 static void bridge_clone_destroy(struct ifnet *);
239 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
240 static void bridge_mutecaps(struct bridge_softc *);
241 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
243 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
244 static void bridge_init(void *);
245 static void bridge_dummynet(struct mbuf *, struct ifnet *);
246 static void bridge_stop(struct ifnet *, int);
247 static int bridge_transmit(struct ifnet *, struct mbuf *);
248 static void bridge_qflush(struct ifnet *);
249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
250 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
252 static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
254 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
256 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
259 static void bridge_timer(void *);
261 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
263 static void bridge_span(struct bridge_softc *, struct mbuf *);
265 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
266 uint16_t, struct bridge_iflist *, int, uint8_t);
267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
269 static void bridge_rttrim(struct bridge_softc *);
270 static void bridge_rtage(struct bridge_softc *);
271 static void bridge_rtflush(struct bridge_softc *, int);
272 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
275 static void bridge_rtable_init(struct bridge_softc *);
276 static void bridge_rtable_fini(struct bridge_softc *);
278 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
280 const uint8_t *, uint16_t);
281 static int bridge_rtnode_insert(struct bridge_softc *,
282 struct bridge_rtnode *);
283 static void bridge_rtnode_destroy(struct bridge_softc *,
284 struct bridge_rtnode *);
285 static void bridge_rtable_expire(struct ifnet *, int);
286 static void bridge_state_change(struct ifnet *, int);
288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
292 static void bridge_delete_member(struct bridge_softc *,
293 struct bridge_iflist *, int);
294 static void bridge_delete_span(struct bridge_softc *,
295 struct bridge_iflist *);
297 static int bridge_ioctl_add(struct bridge_softc *, void *);
298 static int bridge_ioctl_del(struct bridge_softc *, void *);
299 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
300 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
301 static int bridge_ioctl_scache(struct bridge_softc *, void *);
302 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
303 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
304 static int bridge_ioctl_rts(struct bridge_softc *, void *);
305 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
306 static int bridge_ioctl_sto(struct bridge_softc *, void *);
307 static int bridge_ioctl_gto(struct bridge_softc *, void *);
308 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
309 static int bridge_ioctl_flush(struct bridge_softc *, void *);
310 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
311 static int bridge_ioctl_spri(struct bridge_softc *, void *);
312 static int bridge_ioctl_ght(struct bridge_softc *, void *);
313 static int bridge_ioctl_sht(struct bridge_softc *, void *);
314 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
315 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
316 static int bridge_ioctl_gma(struct bridge_softc *, void *);
317 static int bridge_ioctl_sma(struct bridge_softc *, void *);
318 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
319 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
320 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
321 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
322 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
323 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
324 static int bridge_ioctl_grte(struct bridge_softc *, void *);
325 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
326 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
327 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
328 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
330 static int bridge_ip_checkbasic(struct mbuf **mp);
332 static int bridge_ip6_checkbasic(struct mbuf **mp);
334 static int bridge_fragment(struct ifnet *, struct mbuf **mp,
335 struct ether_header *, int, struct llc *);
336 static void bridge_linkstate(struct ifnet *ifp);
337 static void bridge_linkcheck(struct bridge_softc *sc);
339 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
341 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
342 #define VLANTAGOF(_m) \
343 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
345 static struct bstp_cb_ops bridge_ops = {
346 .bcb_state = bridge_state_change,
347 .bcb_rtage = bridge_rtable_expire
350 SYSCTL_DECL(_net_link);
351 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
353 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
354 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
355 static int pfil_member = 1; /* run pfil hooks on the member interface */
356 static int pfil_ipfw = 0; /* layer2 filter with ipfw */
357 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */
358 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
359 locally destined packets */
360 static int log_stp = 0; /* log STP state changes */
361 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */
362 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
364 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
365 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
366 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
367 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
368 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
369 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
370 &pfil_bridge, 0, "Packet filter on the bridge interface");
371 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
372 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
373 &pfil_member, 0, "Packet filter on the member interface");
374 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
375 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
377 "Packet filter on the physical interface for locally destined packets");
378 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
379 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
380 &log_stp, 0, "Log STP state changes");
381 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
382 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
383 &bridge_inherit_mac, 0,
384 "Inherit MAC address from the first bridge member");
386 static VNET_DEFINE(int, allow_llz_overlap) = 0;
387 #define V_allow_llz_overlap VNET(allow_llz_overlap)
388 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
389 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
390 "zones of a bridge interface and the member interfaces");
392 struct bridge_control {
393 int (*bc_func)(struct bridge_softc *, void *);
398 #define BC_F_COPYIN 0x01 /* copy arguments in */
399 #define BC_F_COPYOUT 0x02 /* copy arguments out */
400 #define BC_F_SUSER 0x04 /* do super-user check */
402 const struct bridge_control bridge_control_table[] = {
403 { bridge_ioctl_add, sizeof(struct ifbreq),
404 BC_F_COPYIN|BC_F_SUSER },
405 { bridge_ioctl_del, sizeof(struct ifbreq),
406 BC_F_COPYIN|BC_F_SUSER },
408 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
409 BC_F_COPYIN|BC_F_COPYOUT },
410 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
411 BC_F_COPYIN|BC_F_SUSER },
413 { bridge_ioctl_scache, sizeof(struct ifbrparam),
414 BC_F_COPYIN|BC_F_SUSER },
415 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
418 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
419 BC_F_COPYIN|BC_F_COPYOUT },
420 { bridge_ioctl_rts, sizeof(struct ifbaconf),
421 BC_F_COPYIN|BC_F_COPYOUT },
423 { bridge_ioctl_saddr, sizeof(struct ifbareq),
424 BC_F_COPYIN|BC_F_SUSER },
426 { bridge_ioctl_sto, sizeof(struct ifbrparam),
427 BC_F_COPYIN|BC_F_SUSER },
428 { bridge_ioctl_gto, sizeof(struct ifbrparam),
431 { bridge_ioctl_daddr, sizeof(struct ifbareq),
432 BC_F_COPYIN|BC_F_SUSER },
434 { bridge_ioctl_flush, sizeof(struct ifbreq),
435 BC_F_COPYIN|BC_F_SUSER },
437 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
439 { bridge_ioctl_spri, sizeof(struct ifbrparam),
440 BC_F_COPYIN|BC_F_SUSER },
442 { bridge_ioctl_ght, sizeof(struct ifbrparam),
444 { bridge_ioctl_sht, sizeof(struct ifbrparam),
445 BC_F_COPYIN|BC_F_SUSER },
447 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
449 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
450 BC_F_COPYIN|BC_F_SUSER },
452 { bridge_ioctl_gma, sizeof(struct ifbrparam),
454 { bridge_ioctl_sma, sizeof(struct ifbrparam),
455 BC_F_COPYIN|BC_F_SUSER },
457 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
458 BC_F_COPYIN|BC_F_SUSER },
460 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
461 BC_F_COPYIN|BC_F_SUSER },
463 { bridge_ioctl_addspan, sizeof(struct ifbreq),
464 BC_F_COPYIN|BC_F_SUSER },
465 { bridge_ioctl_delspan, sizeof(struct ifbreq),
466 BC_F_COPYIN|BC_F_SUSER },
468 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
471 { bridge_ioctl_grte, sizeof(struct ifbrparam),
474 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
475 BC_F_COPYIN|BC_F_COPYOUT },
477 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
478 BC_F_COPYIN|BC_F_SUSER },
480 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
481 BC_F_COPYIN|BC_F_SUSER },
483 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
484 BC_F_COPYIN|BC_F_SUSER },
487 const int bridge_control_table_size =
488 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
490 LIST_HEAD(, bridge_softc) bridge_list;
492 static struct if_clone *bridge_cloner;
493 static const char bridge_name[] = "bridge";
496 bridge_modevent(module_t mod, int type, void *data)
501 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
502 bridge_cloner = if_clone_simple(bridge_name,
503 bridge_clone_create, bridge_clone_destroy, 0);
504 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
505 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
507 LIST_INIT(&bridge_list);
508 bridge_input_p = bridge_input;
509 bridge_output_p = bridge_output;
510 bridge_dn_p = bridge_dummynet;
511 bridge_linkstate_p = bridge_linkstate;
512 bridge_detach_cookie = EVENTHANDLER_REGISTER(
513 ifnet_departure_event, bridge_ifdetach, NULL,
514 EVENTHANDLER_PRI_ANY);
517 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
518 bridge_detach_cookie);
519 if_clone_detach(bridge_cloner);
520 uma_zdestroy(bridge_rtnode_zone);
521 bridge_input_p = NULL;
522 bridge_output_p = NULL;
524 bridge_linkstate_p = NULL;
525 mtx_destroy(&bridge_list_mtx);
533 static moduledata_t bridge_mod = {
539 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
540 MODULE_VERSION(if_bridge, 1);
541 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
544 * handler for net.link.bridge.ipfw
547 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
549 int enable = pfil_ipfw;
552 error = sysctl_handle_int(oidp, &enable, 0, req);
553 enable = (enable) ? 1 : 0;
555 if (enable != pfil_ipfw) {
559 * Disable pfil so that ipfw doesnt run twice, if the user
560 * really wants both then they can re-enable pfil_bridge and/or
561 * pfil_member. Also allow non-ip packets as ipfw can filter by
573 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
574 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
577 * bridge_clone_create:
579 * Create a new bridge instance.
582 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
584 struct bridge_softc *sc, *sc2;
585 struct ifnet *bifp, *ifp;
587 unsigned long hostid;
589 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
590 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
596 BRIDGE_LOCK_INIT(sc);
597 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
598 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
600 /* Initialize our routing table. */
601 bridge_rtable_init(sc);
603 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
605 LIST_INIT(&sc->sc_iflist);
606 LIST_INIT(&sc->sc_spanlist);
609 if_initname(ifp, bridge_name, unit);
610 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
611 ifp->if_ioctl = bridge_ioctl;
612 ifp->if_transmit = bridge_transmit;
613 ifp->if_qflush = bridge_qflush;
614 ifp->if_init = bridge_init;
615 ifp->if_type = IFT_BRIDGE;
618 * Generate an ethernet address with a locally administered address.
620 * Since we are using random ethernet addresses for the bridge, it is
621 * possible that we might have address collisions, so make sure that
622 * this hardware address isn't already in use on another bridge.
623 * The first try uses the hostid and falls back to arc4rand().
626 getcredhostid(curthread->td_ucred, &hostid);
628 if (fb || hostid == 0) {
629 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
630 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
631 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
633 sc->sc_defaddr[0] = 0x2;
634 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
635 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
636 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
637 sc->sc_defaddr[4] = hostid & 0xff;
638 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
643 mtx_lock(&bridge_list_mtx);
644 LIST_FOREACH(sc2, &bridge_list, sc_list) {
646 if (memcmp(sc->sc_defaddr,
647 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
652 mtx_unlock(&bridge_list_mtx);
653 } while (retry == 1);
655 bstp_attach(&sc->sc_stp, &bridge_ops);
656 ether_ifattach(ifp, sc->sc_defaddr);
657 /* Now undo some of the damage... */
658 ifp->if_baudrate = 0;
659 ifp->if_type = IFT_BRIDGE;
661 mtx_lock(&bridge_list_mtx);
662 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
663 mtx_unlock(&bridge_list_mtx);
669 * bridge_clone_destroy:
671 * Destroy a bridge instance.
674 bridge_clone_destroy(struct ifnet *ifp)
676 struct bridge_softc *sc = ifp->if_softc;
677 struct bridge_iflist *bif;
682 ifp->if_flags &= ~IFF_UP;
684 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
685 bridge_delete_member(sc, bif, 0);
687 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
688 bridge_delete_span(sc, bif);
693 callout_drain(&sc->sc_brcallout);
695 mtx_lock(&bridge_list_mtx);
696 LIST_REMOVE(sc, sc_list);
697 mtx_unlock(&bridge_list_mtx);
699 bstp_detach(&sc->sc_stp);
703 /* Tear down the routing table. */
704 bridge_rtable_fini(sc);
706 BRIDGE_LOCK_DESTROY(sc);
713 * Handle a control request from the operator.
716 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
718 struct bridge_softc *sc = ifp->if_softc;
719 struct ifreq *ifr = (struct ifreq *)data;
720 struct bridge_iflist *bif;
721 struct thread *td = curthread;
723 struct ifbreq ifbreq;
724 struct ifbifconf ifbifconf;
725 struct ifbareq ifbareq;
726 struct ifbaconf ifbaconf;
727 struct ifbrparam ifbrparam;
728 struct ifbropreq ifbropreq;
730 struct ifdrv *ifd = (struct ifdrv *) data;
731 const struct bridge_control *bc;
742 if (ifd->ifd_cmd >= bridge_control_table_size) {
746 bc = &bridge_control_table[ifd->ifd_cmd];
748 if (cmd == SIOCGDRVSPEC &&
749 (bc->bc_flags & BC_F_COPYOUT) == 0) {
753 else if (cmd == SIOCSDRVSPEC &&
754 (bc->bc_flags & BC_F_COPYOUT) != 0) {
759 if (bc->bc_flags & BC_F_SUSER) {
760 error = priv_check(td, PRIV_NET_BRIDGE);
765 if (ifd->ifd_len != bc->bc_argsize ||
766 ifd->ifd_len > sizeof(args)) {
771 bzero(&args, sizeof(args));
772 if (bc->bc_flags & BC_F_COPYIN) {
773 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
779 error = (*bc->bc_func)(sc, &args);
784 if (bc->bc_flags & BC_F_COPYOUT)
785 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
790 if (!(ifp->if_flags & IFF_UP) &&
791 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
793 * If interface is marked down and it is running,
794 * then stop and disable it.
799 } else if ((ifp->if_flags & IFF_UP) &&
800 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
802 * If interface is marked up and it is stopped, then
810 if (ifr->ifr_mtu < 576) {
814 if (LIST_EMPTY(&sc->sc_iflist)) {
815 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
819 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
820 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
821 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
822 " != %d\n", sc->sc_ifp->if_xname,
823 bif->bif_ifp->if_mtu,
824 bif->bif_ifp->if_xname, ifr->ifr_mtu);
830 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
835 * drop the lock as ether_ioctl() will call bridge_start() and
836 * cause the lock to be recursed.
838 error = ether_ioctl(ifp, cmd, data);
848 * Clear or restore unwanted capabilities on the member interface
851 bridge_mutecaps(struct bridge_softc *sc)
853 struct bridge_iflist *bif;
856 /* Initial bitmask of capabilities to test */
857 mask = BRIDGE_IFCAPS_MASK;
859 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
860 /* Every member must support it or its disabled */
861 mask &= bif->bif_savedcaps;
865 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
866 enabled = bif->bif_ifp->if_capenable;
867 enabled &= ~BRIDGE_IFCAPS_STRIP;
868 /* strip off mask bits and enable them again if allowed */
869 enabled &= ~BRIDGE_IFCAPS_MASK;
872 bridge_set_ifcap(sc, bif, enabled);
880 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
882 struct ifnet *ifp = bif->bif_ifp;
886 BRIDGE_UNLOCK_ASSERT(sc);
888 bzero(&ifr, sizeof(ifr));
889 ifr.ifr_reqcap = set;
891 if (ifp->if_capenable != set) {
892 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
894 if_printf(sc->sc_ifp,
895 "error setting interface capabilities on %s\n",
901 * bridge_lookup_member:
903 * Lookup a bridge member interface.
905 static struct bridge_iflist *
906 bridge_lookup_member(struct bridge_softc *sc, const char *name)
908 struct bridge_iflist *bif;
911 BRIDGE_LOCK_ASSERT(sc);
913 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
915 if (strcmp(ifp->if_xname, name) == 0)
923 * bridge_lookup_member_if:
925 * Lookup a bridge member interface by ifnet*.
927 static struct bridge_iflist *
928 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
930 struct bridge_iflist *bif;
932 BRIDGE_LOCK_ASSERT(sc);
934 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
935 if (bif->bif_ifp == member_ifp)
943 * bridge_delete_member:
945 * Delete the specified member interface.
948 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
951 struct ifnet *ifs = bif->bif_ifp;
952 struct ifnet *fif = NULL;
954 BRIDGE_LOCK_ASSERT(sc);
956 if (bif->bif_flags & IFBIF_STP)
957 bstp_disable(&bif->bif_stp);
959 ifs->if_bridge = NULL;
961 LIST_REMOVE(bif, bif_next);
965 * If removing the interface that gave the bridge its mac address, set
966 * the mac address of the bridge to the address of the next member, or
967 * to its default address if no members are left.
969 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
970 if (LIST_EMPTY(&sc->sc_iflist)) {
971 bcopy(sc->sc_defaddr,
972 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
973 sc->sc_ifaddr = NULL;
975 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
976 bcopy(IF_LLADDR(fif),
977 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
980 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
983 bridge_linkcheck(sc);
984 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
985 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
986 KASSERT(bif->bif_addrcnt == 0,
987 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
991 switch (ifs->if_type) {
995 * Take the interface out of promiscuous mode, but only
996 * if it was promiscuous in the first place. It might
997 * not be if we're in the bridge_ioctl_add() error path.
999 if (ifs->if_flags & IFF_PROMISC)
1000 (void) ifpromisc(ifs, 0);
1008 panic("bridge_delete_member: impossible");
1012 /* reneable any interface capabilities */
1013 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1015 bstp_destroy(&bif->bif_stp); /* prepare to free */
1017 free(bif, M_DEVBUF);
1021 * bridge_delete_span:
1023 * Delete the specified span interface.
1026 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1028 BRIDGE_LOCK_ASSERT(sc);
1030 KASSERT(bif->bif_ifp->if_bridge == NULL,
1031 ("%s: not a span interface", __func__));
1033 LIST_REMOVE(bif, bif_next);
1034 free(bif, M_DEVBUF);
1038 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1040 struct ifbreq *req = arg;
1041 struct bridge_iflist *bif = NULL;
1045 ifs = ifunit(req->ifbr_ifsname);
1048 if (ifs->if_ioctl == NULL) /* must be supported */
1051 /* If it's in the span list, it can't be a member. */
1052 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1053 if (ifs == bif->bif_ifp)
1056 if (ifs->if_bridge == sc)
1059 if (ifs->if_bridge != NULL)
1062 switch (ifs->if_type) {
1066 /* permitted interface types */
1074 * Two valid inet6 addresses with link-local scope must not be
1075 * on the parent interface and the member interfaces at the
1076 * same time. This restriction is needed to prevent violation
1077 * of link-local scope zone. Attempts to add a member
1078 * interface which has inet6 addresses when the parent has
1079 * inet6 triggers removal of all inet6 addresses on the member
1083 /* Check if the parent interface has a link-local scope addr. */
1084 if (V_allow_llz_overlap == 0 &&
1085 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1087 * If any, remove all inet6 addresses from the member
1091 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1092 if (in6ifa_llaonifp(bif->bif_ifp)) {
1094 in6_ifdetach(bif->bif_ifp);
1096 if_printf(sc->sc_ifp,
1097 "IPv6 addresses on %s have been removed "
1098 "before adding it as a member to prevent "
1099 "IPv6 address scope violation.\n",
1100 bif->bif_ifp->if_xname);
1104 if (in6ifa_llaonifp(ifs)) {
1108 if_printf(sc->sc_ifp,
1109 "IPv6 addresses on %s have been removed "
1110 "before adding it as a member to prevent "
1111 "IPv6 address scope violation.\n",
1116 /* Allow the first Ethernet member to define the MTU */
1117 if (LIST_EMPTY(&sc->sc_iflist))
1118 sc->sc_ifp->if_mtu = ifs->if_mtu;
1119 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1120 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1121 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1125 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1130 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1131 bif->bif_savedcaps = ifs->if_capenable;
1134 * Assign the interface's MAC address to the bridge if it's the first
1135 * member and the MAC address of the bridge has not been changed from
1136 * the default randomly generated one.
1138 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1139 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1140 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1141 sc->sc_ifaddr = ifs;
1142 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1145 ifs->if_bridge = sc;
1146 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1148 * XXX: XLOCK HERE!?!
1150 * NOTE: insert_***HEAD*** should be safe for the traversals.
1152 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1154 /* Set interface capabilities to the intersection set of all members */
1155 bridge_mutecaps(sc);
1156 bridge_linkcheck(sc);
1158 /* Place the interface into promiscuous mode */
1159 switch (ifs->if_type) {
1163 error = ifpromisc(ifs, 1);
1169 bridge_delete_member(sc, bif, 0);
1174 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1176 struct ifbreq *req = arg;
1177 struct bridge_iflist *bif;
1179 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1183 bridge_delete_member(sc, bif, 0);
1189 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1191 struct ifbreq *req = arg;
1192 struct bridge_iflist *bif;
1193 struct bstp_port *bp;
1195 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1200 req->ifbr_ifsflags = bif->bif_flags;
1201 req->ifbr_state = bp->bp_state;
1202 req->ifbr_priority = bp->bp_priority;
1203 req->ifbr_path_cost = bp->bp_path_cost;
1204 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1205 req->ifbr_proto = bp->bp_protover;
1206 req->ifbr_role = bp->bp_role;
1207 req->ifbr_stpflags = bp->bp_flags;
1208 req->ifbr_addrcnt = bif->bif_addrcnt;
1209 req->ifbr_addrmax = bif->bif_addrmax;
1210 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1212 /* Copy STP state options as flags */
1213 if (bp->bp_operedge)
1214 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1215 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1216 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1217 if (bp->bp_ptp_link)
1218 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1219 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1220 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1221 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1222 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1223 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1224 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1229 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1231 struct ifbreq *req = arg;
1232 struct bridge_iflist *bif;
1233 struct bstp_port *bp;
1236 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1241 if (req->ifbr_ifsflags & IFBIF_SPAN)
1242 /* SPAN is readonly */
1245 if (req->ifbr_ifsflags & IFBIF_STP) {
1246 if ((bif->bif_flags & IFBIF_STP) == 0) {
1247 error = bstp_enable(&bif->bif_stp);
1252 if ((bif->bif_flags & IFBIF_STP) != 0)
1253 bstp_disable(&bif->bif_stp);
1256 /* Pass on STP flags */
1257 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1258 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1259 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1260 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1262 /* Save the bits relating to the bridge */
1263 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1269 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1271 struct ifbrparam *param = arg;
1273 sc->sc_brtmax = param->ifbrp_csize;
1280 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1282 struct ifbrparam *param = arg;
1284 param->ifbrp_csize = sc->sc_brtmax;
1290 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1292 struct ifbifconf *bifc = arg;
1293 struct bridge_iflist *bif;
1296 int count, buflen, len, error = 0;
1299 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1301 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1304 buflen = sizeof(breq) * count;
1305 if (bifc->ifbic_len == 0) {
1306 bifc->ifbic_len = buflen;
1310 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1315 len = min(bifc->ifbic_len, buflen);
1316 bzero(&breq, sizeof(breq));
1317 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1318 if (len < sizeof(breq))
1321 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1322 sizeof(breq.ifbr_ifsname));
1323 /* Fill in the ifbreq structure */
1324 error = bridge_ioctl_gifflags(sc, &breq);
1327 memcpy(buf, &breq, sizeof(breq));
1329 buf += sizeof(breq);
1330 len -= sizeof(breq);
1332 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1333 if (len < sizeof(breq))
1336 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1337 sizeof(breq.ifbr_ifsname));
1338 breq.ifbr_ifsflags = bif->bif_flags;
1339 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1340 memcpy(buf, &breq, sizeof(breq));
1342 buf += sizeof(breq);
1343 len -= sizeof(breq);
1347 bifc->ifbic_len = sizeof(breq) * count;
1348 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1350 free(outbuf, M_TEMP);
1355 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1357 struct ifbaconf *bac = arg;
1358 struct bridge_rtnode *brt;
1359 struct ifbareq bareq;
1361 int count, buflen, len, error = 0;
1363 if (bac->ifbac_len == 0)
1367 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1369 buflen = sizeof(bareq) * count;
1372 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1377 len = min(bac->ifbac_len, buflen);
1378 bzero(&bareq, sizeof(bareq));
1379 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1380 if (len < sizeof(bareq))
1382 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1383 sizeof(bareq.ifba_ifsname));
1384 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1385 bareq.ifba_vlan = brt->brt_vlan;
1386 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1387 time_uptime < brt->brt_expire)
1388 bareq.ifba_expire = brt->brt_expire - time_uptime;
1390 bareq.ifba_expire = 0;
1391 bareq.ifba_flags = brt->brt_flags;
1393 memcpy(buf, &bareq, sizeof(bareq));
1395 buf += sizeof(bareq);
1396 len -= sizeof(bareq);
1400 bac->ifbac_len = sizeof(bareq) * count;
1401 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1403 free(outbuf, M_TEMP);
1408 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1410 struct ifbareq *req = arg;
1411 struct bridge_iflist *bif;
1414 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1418 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1425 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1427 struct ifbrparam *param = arg;
1429 sc->sc_brttimeout = param->ifbrp_ctime;
1434 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1436 struct ifbrparam *param = arg;
1438 param->ifbrp_ctime = sc->sc_brttimeout;
1443 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1445 struct ifbareq *req = arg;
1447 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1451 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1453 struct ifbreq *req = arg;
1455 bridge_rtflush(sc, req->ifbr_ifsflags);
1460 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1462 struct ifbrparam *param = arg;
1463 struct bstp_state *bs = &sc->sc_stp;
1465 param->ifbrp_prio = bs->bs_bridge_priority;
1470 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1472 struct ifbrparam *param = arg;
1474 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1478 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1480 struct ifbrparam *param = arg;
1481 struct bstp_state *bs = &sc->sc_stp;
1483 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1488 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1490 struct ifbrparam *param = arg;
1492 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1496 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1498 struct ifbrparam *param = arg;
1499 struct bstp_state *bs = &sc->sc_stp;
1501 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1506 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1508 struct ifbrparam *param = arg;
1510 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1514 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1516 struct ifbrparam *param = arg;
1517 struct bstp_state *bs = &sc->sc_stp;
1519 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1524 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1526 struct ifbrparam *param = arg;
1528 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1532 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1534 struct ifbreq *req = arg;
1535 struct bridge_iflist *bif;
1537 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1541 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1545 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1547 struct ifbreq *req = arg;
1548 struct bridge_iflist *bif;
1550 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1554 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1558 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1560 struct ifbreq *req = arg;
1561 struct bridge_iflist *bif;
1563 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1567 bif->bif_addrmax = req->ifbr_addrmax;
1572 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1574 struct ifbreq *req = arg;
1575 struct bridge_iflist *bif = NULL;
1578 ifs = ifunit(req->ifbr_ifsname);
1582 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1583 if (ifs == bif->bif_ifp)
1586 if (ifs->if_bridge != NULL)
1589 switch (ifs->if_type) {
1598 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1603 bif->bif_flags = IFBIF_SPAN;
1605 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1611 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1613 struct ifbreq *req = arg;
1614 struct bridge_iflist *bif;
1617 ifs = ifunit(req->ifbr_ifsname);
1621 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1622 if (ifs == bif->bif_ifp)
1628 bridge_delete_span(sc, bif);
1634 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1636 struct ifbropreq *req = arg;
1637 struct bstp_state *bs = &sc->sc_stp;
1638 struct bstp_port *root_port;
1640 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1641 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1642 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1644 root_port = bs->bs_root_port;
1645 if (root_port == NULL)
1646 req->ifbop_root_port = 0;
1648 req->ifbop_root_port = root_port->bp_ifp->if_index;
1650 req->ifbop_holdcount = bs->bs_txholdcount;
1651 req->ifbop_priority = bs->bs_bridge_priority;
1652 req->ifbop_protocol = bs->bs_protover;
1653 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1654 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1655 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1656 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1657 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1658 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1664 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1666 struct ifbrparam *param = arg;
1668 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1673 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1675 struct ifbpstpconf *bifstp = arg;
1676 struct bridge_iflist *bif;
1677 struct bstp_port *bp;
1678 struct ifbpstpreq bpreq;
1680 int count, buflen, len, error = 0;
1683 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1684 if ((bif->bif_flags & IFBIF_STP) != 0)
1688 buflen = sizeof(bpreq) * count;
1689 if (bifstp->ifbpstp_len == 0) {
1690 bifstp->ifbpstp_len = buflen;
1695 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1700 len = min(bifstp->ifbpstp_len, buflen);
1701 bzero(&bpreq, sizeof(bpreq));
1702 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1703 if (len < sizeof(bpreq))
1706 if ((bif->bif_flags & IFBIF_STP) == 0)
1710 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1711 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1712 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1713 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1714 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1715 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1717 memcpy(buf, &bpreq, sizeof(bpreq));
1719 buf += sizeof(bpreq);
1720 len -= sizeof(bpreq);
1724 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1725 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1727 free(outbuf, M_TEMP);
1732 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1734 struct ifbrparam *param = arg;
1736 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1740 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1742 struct ifbrparam *param = arg;
1744 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1750 * Detach an interface from a bridge. Called when a member
1751 * interface is detaching.
1754 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1756 struct bridge_softc *sc = ifp->if_bridge;
1757 struct bridge_iflist *bif;
1759 if (ifp->if_flags & IFF_RENAMING)
1762 /* Check if the interface is a bridge member */
1766 bif = bridge_lookup_member_if(sc, ifp);
1768 bridge_delete_member(sc, bif, 1);
1774 /* Check if the interface is a span port */
1775 mtx_lock(&bridge_list_mtx);
1776 LIST_FOREACH(sc, &bridge_list, sc_list) {
1778 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1779 if (ifp == bif->bif_ifp) {
1780 bridge_delete_span(sc, bif);
1786 mtx_unlock(&bridge_list_mtx);
1792 * Initialize a bridge interface.
1795 bridge_init(void *xsc)
1797 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1798 struct ifnet *ifp = sc->sc_ifp;
1800 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1804 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1807 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1808 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1816 * Stop the bridge interface.
1819 bridge_stop(struct ifnet *ifp, int disable)
1821 struct bridge_softc *sc = ifp->if_softc;
1823 BRIDGE_LOCK_ASSERT(sc);
1825 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1828 callout_stop(&sc->sc_brcallout);
1829 bstp_stop(&sc->sc_stp);
1831 bridge_rtflush(sc, IFBF_FLUSHDYN);
1833 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1839 * Enqueue a packet on a bridge member interface.
1843 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1849 /* We may be sending a fragment so traverse the mbuf */
1852 m->m_nextpkt = NULL;
1853 len = m->m_pkthdr.len;
1854 mflags = m->m_flags;
1857 * If underlying interface can not do VLAN tag insertion itself
1858 * then attach a packet tag that holds it.
1860 if ((m->m_flags & M_VLANTAG) &&
1861 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1862 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1865 "unable to prepend VLAN header\n");
1866 dst_ifp->if_oerrors++;
1869 m->m_flags &= ~M_VLANTAG;
1872 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1873 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1875 sc->sc_ifp->if_oerrors++;
1879 sc->sc_ifp->if_opackets++;
1880 sc->sc_ifp->if_obytes += len;
1881 if (mflags & M_MCAST)
1882 sc->sc_ifp->if_omcasts++;
1891 * Receive a queued packet from dummynet and pass it on to the output
1894 * The mbuf has the Ethernet header already attached.
1897 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1899 struct bridge_softc *sc;
1901 sc = ifp->if_bridge;
1904 * The packet didnt originate from a member interface. This should only
1905 * ever happen if a member interface is removed while packets are
1913 if (PFIL_HOOKED(&V_inet_pfil_hook)
1915 || PFIL_HOOKED(&V_inet6_pfil_hook)
1918 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1924 bridge_enqueue(sc, ifp, m);
1930 * Send output from a bridge member interface. This
1931 * performs the bridging function for locally originated
1934 * The mbuf has the Ethernet header already attached. We must
1935 * enqueue or free the mbuf before returning.
1938 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1941 struct ether_header *eh;
1942 struct ifnet *dst_if;
1943 struct bridge_softc *sc;
1946 if (m->m_len < ETHER_HDR_LEN) {
1947 m = m_pullup(m, ETHER_HDR_LEN);
1952 eh = mtod(m, struct ether_header *);
1953 sc = ifp->if_bridge;
1954 vlan = VLANTAGOF(m);
1959 * If bridge is down, but the original output interface is up,
1960 * go ahead and send out that interface. Otherwise, the packet
1963 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1969 * If the packet is a multicast, or we don't know a better way to
1970 * get there, send to all interfaces.
1972 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1975 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1976 if (dst_if == NULL) {
1977 struct bridge_iflist *bif;
1979 int error = 0, used = 0;
1983 BRIDGE_LOCK2REF(sc, error);
1989 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1990 dst_if = bif->bif_ifp;
1992 if (dst_if->if_type == IFT_GIF)
1994 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1998 * If this is not the original output interface,
1999 * and the interface is participating in spanning
2000 * tree, make sure the port is in a state that
2001 * allows forwarding.
2003 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2004 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2007 if (LIST_NEXT(bif, bif_next) == NULL) {
2011 mc = m_copypacket(m, M_NOWAIT);
2013 sc->sc_ifp->if_oerrors++;
2018 bridge_enqueue(sc, dst_if, mc);
2028 * XXX Spanning tree consideration here?
2032 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2039 bridge_enqueue(sc, dst_if, m);
2046 * Do output on a bridge.
2050 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2052 struct bridge_softc *sc;
2053 struct ether_header *eh;
2054 struct ifnet *dst_if;
2059 ETHER_BPF_MTAP(ifp, m);
2061 eh = mtod(m, struct ether_header *);
2064 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2065 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2067 error = bridge_enqueue(sc, dst_if, m);
2069 bridge_broadcast(sc, ifp, m, 0);
2075 * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2078 bridge_qflush(struct ifnet *ifp __unused)
2085 * The forwarding function of the bridge.
2087 * NOTE: Releases the lock on return.
2090 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2093 struct bridge_iflist *dbif;
2094 struct ifnet *src_if, *dst_if, *ifp;
2095 struct ether_header *eh;
2100 src_if = m->m_pkthdr.rcvif;
2104 ifp->if_ibytes += m->m_pkthdr.len;
2105 vlan = VLANTAGOF(m);
2107 if ((sbif->bif_flags & IFBIF_STP) &&
2108 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2111 eh = mtod(m, struct ether_header *);
2112 dst = eh->ether_dhost;
2114 /* If the interface is learning, record the address. */
2115 if (sbif->bif_flags & IFBIF_LEARNING) {
2116 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2117 sbif, 0, IFBAF_DYNAMIC);
2119 * If the interface has addresses limits then deny any source
2120 * that is not in the cache.
2122 if (error && sbif->bif_addrmax)
2126 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2127 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2131 * At this point, the port either doesn't participate
2132 * in spanning tree or it is in the forwarding state.
2136 * If the packet is unicast, destined for someone on
2137 * "this" side of the bridge, drop it.
2139 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2140 dst_if = bridge_rtlookup(sc, dst, vlan);
2141 if (src_if == dst_if)
2145 * Check if its a reserved multicast address, any address
2146 * listed in 802.1D section 7.12.6 may not be forwarded by the
2148 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2150 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2151 dst[2] == 0xc2 && dst[3] == 0x00 &&
2152 dst[4] == 0x00 && dst[5] <= 0x0f)
2155 /* ...forward it to all interfaces. */
2161 * If we have a destination interface which is a member of our bridge,
2162 * OR this is a unicast packet, push it through the bpf(4) machinery.
2163 * For broadcast or multicast packets, don't bother because it will
2164 * be reinjected into ether_input. We do this before we pass the packets
2165 * through the pfil(9) framework, as it is possible that pfil(9) will
2166 * drop the packet, or possibly modify it, making it difficult to debug
2167 * firewall issues on the bridge.
2169 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2170 ETHER_BPF_MTAP(ifp, m);
2172 /* run the packet filter */
2173 if (PFIL_HOOKED(&V_inet_pfil_hook)
2175 || PFIL_HOOKED(&V_inet6_pfil_hook)
2179 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2186 if (dst_if == NULL) {
2187 bridge_broadcast(sc, src_if, m, 1);
2192 * At this point, we're dealing with a unicast frame
2193 * going to a different interface.
2195 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2198 dbif = bridge_lookup_member_if(sc, dst_if);
2200 /* Not a member of the bridge (anymore?) */
2203 /* Private segments can not talk to each other */
2204 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2207 if ((dbif->bif_flags & IFBIF_STP) &&
2208 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2213 if (PFIL_HOOKED(&V_inet_pfil_hook)
2215 || PFIL_HOOKED(&V_inet6_pfil_hook)
2218 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2224 bridge_enqueue(sc, dst_if, m);
2235 * Receive input from a member interface. Queue the packet for
2236 * bridging if it is not for us.
2238 static struct mbuf *
2239 bridge_input(struct ifnet *ifp, struct mbuf *m)
2241 struct bridge_softc *sc = ifp->if_bridge;
2242 struct bridge_iflist *bif, *bif2;
2244 struct ether_header *eh;
2245 struct mbuf *mc, *mc2;
2249 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2253 vlan = VLANTAGOF(m);
2256 * Implement support for bridge monitoring. If this flag has been
2257 * set on this interface, discard the packet once we push it through
2258 * the bpf(4) machinery, but before we do, increment the byte and
2259 * packet counters associated with this interface.
2261 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2262 m->m_pkthdr.rcvif = bifp;
2263 ETHER_BPF_MTAP(bifp, m);
2264 bifp->if_ipackets++;
2265 bifp->if_ibytes += m->m_pkthdr.len;
2270 bif = bridge_lookup_member_if(sc, ifp);
2276 eh = mtod(m, struct ether_header *);
2280 if (m->m_flags & (M_BCAST|M_MCAST)) {
2281 /* Tap off 802.1D packets; they do not get forwarded. */
2282 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2283 ETHER_ADDR_LEN) == 0) {
2284 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2289 if ((bif->bif_flags & IFBIF_STP) &&
2290 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2296 * Make a deep copy of the packet and enqueue the copy
2297 * for bridge processing; return the original packet for
2300 mc = m_dup(m, M_NOWAIT);
2306 /* Perform the bridge forwarding function with the copy. */
2307 bridge_forward(sc, bif, mc);
2310 * Reinject the mbuf as arriving on the bridge so we have a
2311 * chance at claiming multicast packets. We can not loop back
2312 * here from ether_input as a bridge is never a member of a
2315 KASSERT(bifp->if_bridge == NULL,
2316 ("loop created in bridge_input"));
2317 mc2 = m_dup(m, M_NOWAIT);
2319 /* Keep the layer3 header aligned */
2320 int i = min(mc2->m_pkthdr.len, max_protohdr);
2321 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2324 mc2->m_pkthdr.rcvif = bifp;
2325 (*bifp->if_input)(bifp, mc2);
2328 /* Return the original packet for local processing. */
2332 if ((bif->bif_flags & IFBIF_STP) &&
2333 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2338 #if (defined(INET) || defined(INET6))
2339 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2340 || ((iface)->if_carp \
2341 && (*carp_forus_p)((iface), eh->ether_dhost))
2342 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2343 || ((iface)->if_carp \
2344 && (*carp_forus_p)((iface), eh->ether_shost))
2346 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2347 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2351 # define OR_PFIL_HOOKED_INET6 \
2352 || PFIL_HOOKED(&V_inet6_pfil_hook)
2354 # define OR_PFIL_HOOKED_INET6
2357 #define GRAB_OUR_PACKETS(iface) \
2358 if ((iface)->if_type == IFT_GIF) \
2360 /* It is destined for us. */ \
2361 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2362 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2364 if ((iface)->if_type == IFT_BRIDGE) { \
2365 ETHER_BPF_MTAP(iface, m); \
2366 iface->if_ipackets++; \
2367 iface->if_ibytes += m->m_pkthdr.len; \
2368 /* Filter on the physical interface. */ \
2369 if (pfil_local_phys && \
2370 (PFIL_HOOKED(&V_inet_pfil_hook) \
2371 OR_PFIL_HOOKED_INET6)) { \
2372 if (bridge_pfil(&m, NULL, ifp, \
2373 PFIL_IN) != 0 || m == NULL) { \
2374 BRIDGE_UNLOCK(sc); \
2377 eh = mtod(m, struct ether_header *); \
2380 if (bif->bif_flags & IFBIF_LEARNING) { \
2381 error = bridge_rtupdate(sc, eh->ether_shost, \
2382 vlan, bif, 0, IFBAF_DYNAMIC); \
2383 if (error && bif->bif_addrmax) { \
2384 BRIDGE_UNLOCK(sc); \
2389 m->m_pkthdr.rcvif = iface; \
2390 BRIDGE_UNLOCK(sc); \
2394 /* We just received a packet that we sent out. */ \
2395 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2396 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2398 BRIDGE_UNLOCK(sc); \
2404 * Unicast. Make sure it's not for the bridge.
2406 do { GRAB_OUR_PACKETS(bifp) } while (0);
2409 * Give a chance for ifp at first priority. This will help when the
2410 * packet comes through the interface like VLAN's with the same MACs
2411 * on several interfaces from the same bridge. This also will save
2412 * some CPU cycles in case the destination interface and the input
2413 * interface (eq ifp) are the same.
2415 do { GRAB_OUR_PACKETS(ifp) } while (0);
2417 /* Now check the all bridge members. */
2418 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2419 GRAB_OUR_PACKETS(bif2->bif_ifp)
2422 #undef OR_CARP_CHECK_WE_ARE_DST
2423 #undef OR_CARP_CHECK_WE_ARE_SRC
2424 #undef OR_PFIL_HOOKED_INET6
2425 #undef GRAB_OUR_PACKETS
2427 /* Perform the bridge forwarding function. */
2428 bridge_forward(sc, bif, m);
2436 * Send a frame to all interfaces that are members of
2437 * the bridge, except for the one on which the packet
2440 * NOTE: Releases the lock on return.
2443 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2444 struct mbuf *m, int runfilt)
2446 struct bridge_iflist *dbif, *sbif;
2448 struct ifnet *dst_if;
2449 int error = 0, used = 0, i;
2451 sbif = bridge_lookup_member_if(sc, src_if);
2453 BRIDGE_LOCK2REF(sc, error);
2459 /* Filter on the bridge interface before broadcasting */
2460 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2462 || PFIL_HOOKED(&V_inet6_pfil_hook)
2465 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2471 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2472 dst_if = dbif->bif_ifp;
2473 if (dst_if == src_if)
2476 /* Private segments can not talk to each other */
2477 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2480 if ((dbif->bif_flags & IFBIF_STP) &&
2481 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2484 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2485 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2488 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2491 if (LIST_NEXT(dbif, bif_next) == NULL) {
2495 mc = m_dup(m, M_NOWAIT);
2497 sc->sc_ifp->if_oerrors++;
2503 * Filter on the output interface. Pass a NULL bridge interface
2504 * pointer so we do not redundantly filter on the bridge for
2505 * each interface we broadcast on.
2507 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2509 || PFIL_HOOKED(&V_inet6_pfil_hook)
2513 /* Keep the layer3 header aligned */
2514 i = min(mc->m_pkthdr.len, max_protohdr);
2515 mc = m_copyup(mc, i, ETHER_ALIGN);
2517 sc->sc_ifp->if_oerrors++;
2521 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2527 bridge_enqueue(sc, dst_if, mc);
2539 * Duplicate a packet out one or more interfaces that are in span mode,
2540 * the original mbuf is unmodified.
2543 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2545 struct bridge_iflist *bif;
2546 struct ifnet *dst_if;
2549 if (LIST_EMPTY(&sc->sc_spanlist))
2552 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2553 dst_if = bif->bif_ifp;
2555 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2558 mc = m_copypacket(m, M_NOWAIT);
2560 sc->sc_ifp->if_oerrors++;
2564 bridge_enqueue(sc, dst_if, mc);
2571 * Add a bridge routing entry.
2574 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2575 struct bridge_iflist *bif, int setflags, uint8_t flags)
2577 struct bridge_rtnode *brt;
2580 BRIDGE_LOCK_ASSERT(sc);
2582 /* Check the source address is valid and not multicast. */
2583 if (ETHER_IS_MULTICAST(dst) ||
2584 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2585 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2588 /* 802.1p frames map to vlan 1 */
2593 * A route for this destination might already exist. If so,
2594 * update it, otherwise create a new one.
2596 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2597 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2598 sc->sc_brtexceeded++;
2601 /* Check per interface address limits (if enabled) */
2602 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2603 bif->bif_addrexceeded++;
2608 * Allocate a new bridge forwarding node, and
2609 * initialize the expiration time and Ethernet
2612 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2616 if (bif->bif_flags & IFBIF_STICKY)
2617 brt->brt_flags = IFBAF_STICKY;
2619 brt->brt_flags = IFBAF_DYNAMIC;
2621 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2622 brt->brt_vlan = vlan;
2624 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2625 uma_zfree(bridge_rtnode_zone, brt);
2632 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2633 brt->brt_dst != bif) {
2634 brt->brt_dst->bif_addrcnt--;
2636 brt->brt_dst->bif_addrcnt++;
2639 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2640 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2642 brt->brt_flags = flags;
2650 * Lookup the destination interface for an address.
2652 static struct ifnet *
2653 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2655 struct bridge_rtnode *brt;
2657 BRIDGE_LOCK_ASSERT(sc);
2659 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2662 return (brt->brt_ifp);
2668 * Trim the routine table so that we have a number
2669 * of routing entries less than or equal to the
2673 bridge_rttrim(struct bridge_softc *sc)
2675 struct bridge_rtnode *brt, *nbrt;
2677 BRIDGE_LOCK_ASSERT(sc);
2679 /* Make sure we actually need to do this. */
2680 if (sc->sc_brtcnt <= sc->sc_brtmax)
2683 /* Force an aging cycle; this might trim enough addresses. */
2685 if (sc->sc_brtcnt <= sc->sc_brtmax)
2688 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2689 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2690 bridge_rtnode_destroy(sc, brt);
2691 if (sc->sc_brtcnt <= sc->sc_brtmax)
2700 * Aging timer for the bridge.
2703 bridge_timer(void *arg)
2705 struct bridge_softc *sc = arg;
2707 BRIDGE_LOCK_ASSERT(sc);
2711 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2712 callout_reset(&sc->sc_brcallout,
2713 bridge_rtable_prune_period * hz, bridge_timer, sc);
2719 * Perform an aging cycle.
2722 bridge_rtage(struct bridge_softc *sc)
2724 struct bridge_rtnode *brt, *nbrt;
2726 BRIDGE_LOCK_ASSERT(sc);
2728 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2729 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2730 if (time_uptime >= brt->brt_expire)
2731 bridge_rtnode_destroy(sc, brt);
2739 * Remove all dynamic addresses from the bridge.
2742 bridge_rtflush(struct bridge_softc *sc, int full)
2744 struct bridge_rtnode *brt, *nbrt;
2746 BRIDGE_LOCK_ASSERT(sc);
2748 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2749 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2750 bridge_rtnode_destroy(sc, brt);
2757 * Remove an address from the table.
2760 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2762 struct bridge_rtnode *brt;
2765 BRIDGE_LOCK_ASSERT(sc);
2768 * If vlan is zero then we want to delete for all vlans so the lookup
2769 * may return more than one.
2771 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2772 bridge_rtnode_destroy(sc, brt);
2776 return (found ? 0 : ENOENT);
2782 * Delete routes to a speicifc member interface.
2785 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2787 struct bridge_rtnode *brt, *nbrt;
2789 BRIDGE_LOCK_ASSERT(sc);
2791 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2792 if (brt->brt_ifp == ifp && (full ||
2793 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2794 bridge_rtnode_destroy(sc, brt);
2799 * bridge_rtable_init:
2801 * Initialize the route table for this bridge.
2804 bridge_rtable_init(struct bridge_softc *sc)
2808 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2809 M_DEVBUF, M_WAITOK);
2811 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2812 LIST_INIT(&sc->sc_rthash[i]);
2814 sc->sc_rthash_key = arc4random();
2815 LIST_INIT(&sc->sc_rtlist);
2819 * bridge_rtable_fini:
2821 * Deconstruct the route table for this bridge.
2824 bridge_rtable_fini(struct bridge_softc *sc)
2827 KASSERT(sc->sc_brtcnt == 0,
2828 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2829 free(sc->sc_rthash, M_DEVBUF);
2833 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2834 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2836 #define mix(a, b, c) \
2838 a -= b; a -= c; a ^= (c >> 13); \
2839 b -= c; b -= a; b ^= (a << 8); \
2840 c -= a; c -= b; c ^= (b >> 13); \
2841 a -= b; a -= c; a ^= (c >> 12); \
2842 b -= c; b -= a; b ^= (a << 16); \
2843 c -= a; c -= b; c ^= (b >> 5); \
2844 a -= b; a -= c; a ^= (c >> 3); \
2845 b -= c; b -= a; b ^= (a << 10); \
2846 c -= a; c -= b; c ^= (b >> 15); \
2847 } while (/*CONSTCOND*/0)
2849 static __inline uint32_t
2850 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2852 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2863 return (c & BRIDGE_RTHASH_MASK);
2869 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2873 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2874 d = ((int)a[i]) - ((int)b[i]);
2881 * bridge_rtnode_lookup:
2883 * Look up a bridge route node for the specified destination. Compare the
2884 * vlan id or if zero then just return the first match.
2886 static struct bridge_rtnode *
2887 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2889 struct bridge_rtnode *brt;
2893 BRIDGE_LOCK_ASSERT(sc);
2895 hash = bridge_rthash(sc, addr);
2896 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2897 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2898 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2908 * bridge_rtnode_insert:
2910 * Insert the specified bridge node into the route table. We
2911 * assume the entry is not already in the table.
2914 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2916 struct bridge_rtnode *lbrt;
2920 BRIDGE_LOCK_ASSERT(sc);
2922 hash = bridge_rthash(sc, brt->brt_addr);
2924 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2926 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2931 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2932 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2935 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2938 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2939 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2942 lbrt = LIST_NEXT(lbrt, brt_hash);
2943 } while (lbrt != NULL);
2946 panic("bridge_rtnode_insert: impossible");
2950 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2957 * bridge_rtnode_destroy:
2959 * Destroy a bridge rtnode.
2962 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2964 BRIDGE_LOCK_ASSERT(sc);
2966 LIST_REMOVE(brt, brt_hash);
2968 LIST_REMOVE(brt, brt_list);
2970 brt->brt_dst->bif_addrcnt--;
2971 uma_zfree(bridge_rtnode_zone, brt);
2975 * bridge_rtable_expire:
2977 * Set the expiry time for all routes on an interface.
2980 bridge_rtable_expire(struct ifnet *ifp, int age)
2982 struct bridge_softc *sc = ifp->if_bridge;
2983 struct bridge_rtnode *brt;
2988 * If the age is zero then flush, otherwise set all the expiry times to
2989 * age for the interface
2992 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2994 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2995 /* Cap the expiry time to 'age' */
2996 if (brt->brt_ifp == ifp &&
2997 brt->brt_expire > time_uptime + age &&
2998 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2999 brt->brt_expire = time_uptime + age;
3006 * bridge_state_change:
3008 * Callback from the bridgestp code when a port changes states.
3011 bridge_state_change(struct ifnet *ifp, int state)
3013 struct bridge_softc *sc = ifp->if_bridge;
3014 static const char *stpstates[] = {
3024 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3025 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3029 * Send bridge packets through pfil if they are one of the types pfil can deal
3030 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3031 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3035 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3037 int snap, error, i, hlen;
3038 struct ether_header *eh1, eh2;
3041 u_int16_t ether_type;
3044 error = -1; /* Default error if not error == 0 */
3047 /* we may return with the IP fields swapped, ensure its not shared */
3048 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3051 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
3052 return (0); /* filtering is disabled */
3054 i = min((*mp)->m_pkthdr.len, max_protohdr);
3055 if ((*mp)->m_len < i) {
3056 *mp = m_pullup(*mp, i);
3058 printf("%s: m_pullup failed\n", __func__);
3063 eh1 = mtod(*mp, struct ether_header *);
3064 ether_type = ntohs(eh1->ether_type);
3067 * Check for SNAP/LLC.
3069 if (ether_type < ETHERMTU) {
3070 struct llc *llc2 = (struct llc *)(eh1 + 1);
3072 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3073 llc2->llc_dsap == LLC_SNAP_LSAP &&
3074 llc2->llc_ssap == LLC_SNAP_LSAP &&
3075 llc2->llc_control == LLC_UI) {
3076 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3082 * If we're trying to filter bridge traffic, don't look at anything
3083 * other than IP and ARP traffic. If the filter doesn't understand
3084 * IPv6, don't allow IPv6 through the bridge either. This is lame
3085 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3086 * but of course we don't have an AppleTalk filter to begin with.
3087 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3090 switch (ether_type) {
3092 case ETHERTYPE_REVARP:
3093 if (pfil_ipfw_arp == 0)
3094 return (0); /* Automatically pass */
3099 case ETHERTYPE_IPV6:
3104 * Check to see if the user wants to pass non-ip
3105 * packets, these will not be checked by pfil(9) and
3106 * passed unconditionally so the default is to drop.
3112 /* Run the packet through pfil before stripping link headers */
3113 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 &&
3114 dir == PFIL_OUT && ifp != NULL) {
3116 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3118 if (*mp == NULL || error != 0) /* packet consumed by filter */
3122 /* Strip off the Ethernet header and keep a copy. */
3123 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3124 m_adj(*mp, ETHER_HDR_LEN);
3126 /* Strip off snap header, if present */
3128 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3129 m_adj(*mp, sizeof(struct llc));
3133 * Check the IP header for alignment and errors
3135 if (dir == PFIL_IN) {
3136 switch (ether_type) {
3138 error = bridge_ip_checkbasic(mp);
3141 case ETHERTYPE_IPV6:
3142 error = bridge_ip6_checkbasic(mp);
3155 * Run the packet through pfil
3157 switch (ether_type) {
3160 * Run pfil on the member interface and the bridge, both can
3161 * be skipped by clearing pfil_member or pfil_bridge.
3164 * in_if -> bridge_if -> out_if
3166 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3167 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3170 if (*mp == NULL || error != 0) /* filter may consume */
3173 if (pfil_member && ifp != NULL)
3174 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3177 if (*mp == NULL || error != 0) /* filter may consume */
3180 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3181 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3184 if (*mp == NULL || error != 0) /* filter may consume */
3187 /* check if we need to fragment the packet */
3188 /* bridge_fragment generates a mbuf chain of packets */
3189 /* that already include eth headers */
3190 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3191 i = (*mp)->m_pkthdr.len;
3192 if (i > ifp->if_mtu) {
3193 error = bridge_fragment(ifp, mp, &eh2, snap,
3199 /* Recalculate the ip checksum. */
3200 ip = mtod(*mp, struct ip *);
3201 hlen = ip->ip_hl << 2;
3202 if (hlen < sizeof(struct ip))
3204 if (hlen > (*mp)->m_len) {
3205 if ((*mp = m_pullup(*mp, hlen)) == 0)
3207 ip = mtod(*mp, struct ip *);
3212 if (hlen == sizeof(struct ip))
3213 ip->ip_sum = in_cksum_hdr(ip);
3215 ip->ip_sum = in_cksum(*mp, hlen);
3219 case ETHERTYPE_IPV6:
3220 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3221 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3224 if (*mp == NULL || error != 0) /* filter may consume */
3227 if (pfil_member && ifp != NULL)
3228 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3231 if (*mp == NULL || error != 0) /* filter may consume */
3234 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3235 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3252 * Finally, put everything back the way it was and return
3255 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3258 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3261 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3264 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3275 * Perform basic checks on header size since
3276 * pfil assumes ip_input has already processed
3277 * it for it. Cut-and-pasted from ip_input.c.
3278 * Given how simple the IPv6 version is,
3279 * does the IPv4 version really need to be
3282 * XXX Should we update ipstat here, or not?
3283 * XXX Right now we update ipstat but not
3287 bridge_ip_checkbasic(struct mbuf **mp)
3289 struct mbuf *m = *mp;
3297 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3298 if ((m = m_copyup(m, sizeof(struct ip),
3299 (max_linkhdr + 3) & ~3)) == NULL) {
3300 /* XXXJRT new stat, please */
3301 KMOD_IPSTAT_INC(ips_toosmall);
3304 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3305 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3306 KMOD_IPSTAT_INC(ips_toosmall);
3310 ip = mtod(m, struct ip *);
3311 if (ip == NULL) goto bad;
3313 if (ip->ip_v != IPVERSION) {
3314 KMOD_IPSTAT_INC(ips_badvers);
3317 hlen = ip->ip_hl << 2;
3318 if (hlen < sizeof(struct ip)) { /* minimum header length */
3319 KMOD_IPSTAT_INC(ips_badhlen);
3322 if (hlen > m->m_len) {
3323 if ((m = m_pullup(m, hlen)) == 0) {
3324 KMOD_IPSTAT_INC(ips_badhlen);
3327 ip = mtod(m, struct ip *);
3328 if (ip == NULL) goto bad;
3331 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3332 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3334 if (hlen == sizeof(struct ip)) {
3335 sum = in_cksum_hdr(ip);
3337 sum = in_cksum(m, hlen);
3341 KMOD_IPSTAT_INC(ips_badsum);
3345 /* Retrieve the packet length. */
3346 len = ntohs(ip->ip_len);
3349 * Check for additional length bogosity
3352 KMOD_IPSTAT_INC(ips_badlen);
3357 * Check that the amount of data in the buffers
3358 * is as at least much as the IP header would have us expect.
3359 * Drop packet if shorter than we expect.
3361 if (m->m_pkthdr.len < len) {
3362 KMOD_IPSTAT_INC(ips_tooshort);
3366 /* Checks out, proceed */
3377 * Same as above, but for IPv6.
3378 * Cut-and-pasted from ip6_input.c.
3379 * XXX Should we update ip6stat, or not?
3382 bridge_ip6_checkbasic(struct mbuf **mp)
3384 struct mbuf *m = *mp;
3385 struct ip6_hdr *ip6;
3388 * If the IPv6 header is not aligned, slurp it up into a new
3389 * mbuf with space for link headers, in the event we forward
3390 * it. Otherwise, if it is aligned, make sure the entire base
3391 * IPv6 header is in the first mbuf of the chain.
3393 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3394 struct ifnet *inifp = m->m_pkthdr.rcvif;
3395 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3396 (max_linkhdr + 3) & ~3)) == NULL) {
3397 /* XXXJRT new stat, please */
3398 IP6STAT_INC(ip6s_toosmall);
3399 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3402 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3403 struct ifnet *inifp = m->m_pkthdr.rcvif;
3404 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3405 IP6STAT_INC(ip6s_toosmall);
3406 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3411 ip6 = mtod(m, struct ip6_hdr *);
3413 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3414 IP6STAT_INC(ip6s_badvers);
3415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3419 /* Checks out, proceed */
3432 * Fragment mbuf chain in multiple packets and prepend ethernet header.
3435 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3436 int snap, struct llc *llc)
3438 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3442 if (m->m_len < sizeof(struct ip) &&
3443 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3445 ip = mtod(m, struct ip *);
3447 m->m_pkthdr.csum_flags |= CSUM_IP;
3448 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3453 * Walk the chain and re-add the Ethernet header for
3456 for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3457 nextpkt = mcur->m_nextpkt;
3458 mcur->m_nextpkt = NULL;
3460 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3464 mprev->m_nextpkt = nextpkt;
3467 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3470 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3474 mprev->m_nextpkt = nextpkt;
3477 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3480 * The previous two M_PREPEND could have inserted one or two
3481 * mbufs in front so we have to update the previous packet's
3484 mcur->m_nextpkt = nextpkt;
3486 mprev->m_nextpkt = mcur;
3488 /* The first mbuf in the original chain needs to be
3495 KMOD_IPSTAT_INC(ips_fragmented);
3499 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3500 m = mcur->m_nextpkt;
3507 bridge_linkstate(struct ifnet *ifp)
3509 struct bridge_softc *sc = ifp->if_bridge;
3510 struct bridge_iflist *bif;
3513 bif = bridge_lookup_member_if(sc, ifp);
3518 bridge_linkcheck(sc);
3521 bstp_linkstate(&bif->bif_stp);
3525 bridge_linkcheck(struct bridge_softc *sc)
3527 struct bridge_iflist *bif;
3528 int new_link, hasls;
3530 BRIDGE_LOCK_ASSERT(sc);
3531 new_link = LINK_STATE_DOWN;
3533 /* Our link is considered up if at least one of our ports is active */
3534 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3535 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3537 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3538 new_link = LINK_STATE_UP;
3542 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3543 /* If no interfaces support link-state then we default to up */
3544 new_link = LINK_STATE_UP;
3546 if_link_state_change(sc->sc_ifp, new_link);