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>
103 #include <sys/rwlock.h>
107 #include <net/if_clone.h>
108 #include <net/if_dl.h>
109 #include <net/if_types.h>
110 #include <net/if_var.h>
111 #include <net/pfil.h>
112 #include <net/vnet.h>
114 #include <netinet/in.h> /* for struct arpcom */
115 #include <netinet/in_systm.h>
116 #include <netinet/in_var.h>
117 #include <netinet/ip.h>
118 #include <netinet/ip_var.h>
120 #include <netinet/ip6.h>
121 #include <netinet6/ip6_var.h>
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>
134 #include <netinet/ip_fw.h>
135 #include <netinet/ipfw/ip_fw_private.h>
138 * Size of the route hash table. Must be a power of two.
140 #ifndef BRIDGE_RTHASH_SIZE
141 #define BRIDGE_RTHASH_SIZE 1024
144 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
147 * Default maximum number of addresses to cache.
149 #ifndef BRIDGE_RTABLE_MAX
150 #define BRIDGE_RTABLE_MAX 2000
154 * Timeout (in seconds) for entries learned dynamically.
156 #ifndef BRIDGE_RTABLE_TIMEOUT
157 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
161 * Number of seconds between walks of the route list.
163 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
164 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
168 * List of capabilities to possibly mask on the member interface.
170 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
173 * List of capabilities to strip
175 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
178 * Bridge interface list entry.
180 struct bridge_iflist {
181 LIST_ENTRY(bridge_iflist) bif_next;
182 struct ifnet *bif_ifp; /* member if */
183 struct bstp_port bif_stp; /* STP state */
184 uint32_t bif_flags; /* member if flags */
185 int bif_savedcaps; /* saved capabilities */
186 uint32_t bif_addrmax; /* max # of addresses */
187 uint32_t bif_addrcnt; /* cur. # of addresses */
188 uint32_t bif_addrexceeded;/* # of address violations */
194 struct bridge_rtnode {
195 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
196 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
197 struct bridge_iflist *brt_dst; /* destination if */
198 unsigned long brt_expire; /* expiration time */
199 uint8_t brt_flags; /* address flags */
200 uint8_t brt_addr[ETHER_ADDR_LEN];
201 uint16_t brt_vlan; /* vlan id */
203 #define brt_ifp brt_dst->bif_ifp
206 * Software state for each bridge.
208 struct bridge_softc {
209 struct ifnet *sc_ifp; /* make this an interface */
210 LIST_ENTRY(bridge_softc) sc_list;
213 uint32_t sc_brtmax; /* max # of addresses */
214 uint32_t sc_brtcnt; /* cur. # of addresses */
215 uint32_t sc_brttimeout; /* rt timeout in seconds */
216 struct callout sc_brcallout; /* bridge callout */
217 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
218 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
219 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
220 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
221 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
222 uint32_t sc_rthash_key; /* key for hash */
223 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
224 struct bstp_state sc_stp; /* STP state */
225 uint32_t sc_brtexceeded; /* # of cache drops */
226 struct ifnet *sc_ifaddr; /* member mac copied from */
227 u_char sc_defaddr[6]; /* Default MAC address */
230 static struct mtx bridge_list_mtx;
231 eventhandler_tag bridge_detach_cookie = NULL;
233 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
235 uma_zone_t bridge_rtnode_zone;
237 static int bridge_clone_create(struct if_clone *, int, caddr_t);
238 static void bridge_clone_destroy(struct ifnet *);
240 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
241 static void bridge_mutecaps(struct bridge_softc *);
242 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
244 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
245 static void bridge_init(void *);
246 static void bridge_dummynet(struct mbuf *, struct ifnet *);
247 static void bridge_stop(struct ifnet *, int);
248 static void bridge_start(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 void 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 int 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 *,
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 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 struct bridge_control {
387 int (*bc_func)(struct bridge_softc *, void *);
392 #define BC_F_COPYIN 0x01 /* copy arguments in */
393 #define BC_F_COPYOUT 0x02 /* copy arguments out */
394 #define BC_F_SUSER 0x04 /* do super-user check */
396 const struct bridge_control bridge_control_table[] = {
397 { bridge_ioctl_add, sizeof(struct ifbreq),
398 BC_F_COPYIN|BC_F_SUSER },
399 { bridge_ioctl_del, sizeof(struct ifbreq),
400 BC_F_COPYIN|BC_F_SUSER },
402 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
403 BC_F_COPYIN|BC_F_COPYOUT },
404 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
405 BC_F_COPYIN|BC_F_SUSER },
407 { bridge_ioctl_scache, sizeof(struct ifbrparam),
408 BC_F_COPYIN|BC_F_SUSER },
409 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
412 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
413 BC_F_COPYIN|BC_F_COPYOUT },
414 { bridge_ioctl_rts, sizeof(struct ifbaconf),
415 BC_F_COPYIN|BC_F_COPYOUT },
417 { bridge_ioctl_saddr, sizeof(struct ifbareq),
418 BC_F_COPYIN|BC_F_SUSER },
420 { bridge_ioctl_sto, sizeof(struct ifbrparam),
421 BC_F_COPYIN|BC_F_SUSER },
422 { bridge_ioctl_gto, sizeof(struct ifbrparam),
425 { bridge_ioctl_daddr, sizeof(struct ifbareq),
426 BC_F_COPYIN|BC_F_SUSER },
428 { bridge_ioctl_flush, sizeof(struct ifbreq),
429 BC_F_COPYIN|BC_F_SUSER },
431 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
433 { bridge_ioctl_spri, sizeof(struct ifbrparam),
434 BC_F_COPYIN|BC_F_SUSER },
436 { bridge_ioctl_ght, sizeof(struct ifbrparam),
438 { bridge_ioctl_sht, sizeof(struct ifbrparam),
439 BC_F_COPYIN|BC_F_SUSER },
441 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
443 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
444 BC_F_COPYIN|BC_F_SUSER },
446 { bridge_ioctl_gma, sizeof(struct ifbrparam),
448 { bridge_ioctl_sma, sizeof(struct ifbrparam),
449 BC_F_COPYIN|BC_F_SUSER },
451 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
452 BC_F_COPYIN|BC_F_SUSER },
454 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
455 BC_F_COPYIN|BC_F_SUSER },
457 { bridge_ioctl_addspan, sizeof(struct ifbreq),
458 BC_F_COPYIN|BC_F_SUSER },
459 { bridge_ioctl_delspan, sizeof(struct ifbreq),
460 BC_F_COPYIN|BC_F_SUSER },
462 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
465 { bridge_ioctl_grte, sizeof(struct ifbrparam),
468 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
469 BC_F_COPYIN|BC_F_COPYOUT },
471 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
472 BC_F_COPYIN|BC_F_SUSER },
474 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
475 BC_F_COPYIN|BC_F_SUSER },
477 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
478 BC_F_COPYIN|BC_F_SUSER },
481 const int bridge_control_table_size =
482 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
484 LIST_HEAD(, bridge_softc) bridge_list;
486 IFC_SIMPLE_DECLARE(bridge, 0);
489 bridge_modevent(module_t mod, int type, void *data)
494 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
495 if_clone_attach(&bridge_cloner);
496 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
497 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
499 LIST_INIT(&bridge_list);
500 bridge_input_p = bridge_input;
501 bridge_output_p = bridge_output;
502 bridge_dn_p = bridge_dummynet;
503 bridge_linkstate_p = bridge_linkstate;
504 bridge_detach_cookie = EVENTHANDLER_REGISTER(
505 ifnet_departure_event, bridge_ifdetach, NULL,
506 EVENTHANDLER_PRI_ANY);
509 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
510 bridge_detach_cookie);
511 if_clone_detach(&bridge_cloner);
512 uma_zdestroy(bridge_rtnode_zone);
513 bridge_input_p = NULL;
514 bridge_output_p = NULL;
516 bridge_linkstate_p = NULL;
517 mtx_destroy(&bridge_list_mtx);
525 static moduledata_t bridge_mod = {
531 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
532 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
535 * handler for net.link.bridge.pfil_ipfw
538 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
540 int enable = pfil_ipfw;
543 error = sysctl_handle_int(oidp, &enable, 0, req);
544 enable = (enable) ? 1 : 0;
546 if (enable != pfil_ipfw) {
550 * Disable pfil so that ipfw doesnt run twice, if the user
551 * really wants both then they can re-enable pfil_bridge and/or
552 * pfil_member. Also allow non-ip packets as ipfw can filter by
564 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
565 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
568 * bridge_clone_create:
570 * Create a new bridge instance.
573 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
575 struct bridge_softc *sc, *sc2;
576 struct ifnet *bifp, *ifp;
578 unsigned long hostid;
580 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
581 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
587 BRIDGE_LOCK_INIT(sc);
588 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
589 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
591 /* Initialize our routing table. */
592 bridge_rtable_init(sc);
594 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
596 LIST_INIT(&sc->sc_iflist);
597 LIST_INIT(&sc->sc_spanlist);
600 if_initname(ifp, ifc->ifc_name, unit);
601 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
602 ifp->if_ioctl = bridge_ioctl;
603 ifp->if_start = bridge_start;
604 ifp->if_init = bridge_init;
605 ifp->if_type = IFT_BRIDGE;
606 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
607 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
608 IFQ_SET_READY(&ifp->if_snd);
611 * Generate an ethernet address with a locally administered address.
613 * Since we are using random ethernet addresses for the bridge, it is
614 * possible that we might have address collisions, so make sure that
615 * this hardware address isn't already in use on another bridge.
616 * The first try uses the hostid and falls back to arc4rand().
619 getcredhostid(curthread->td_ucred, &hostid);
620 for (retry = 1; retry != 0;) {
621 if (fb || hostid == 0) {
622 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
623 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
624 sc->sc_defaddr[0] |= 2; /* set the LAA bit */
626 sc->sc_defaddr[0] = 0x2;
627 sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
628 sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
629 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
630 sc->sc_defaddr[4] = hostid & 0xff;
631 sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
636 mtx_lock(&bridge_list_mtx);
637 LIST_FOREACH(sc2, &bridge_list, sc_list) {
639 if (memcmp(sc->sc_defaddr,
640 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
643 mtx_unlock(&bridge_list_mtx);
646 bstp_attach(&sc->sc_stp, &bridge_ops);
647 ether_ifattach(ifp, sc->sc_defaddr);
648 /* Now undo some of the damage... */
649 ifp->if_baudrate = 0;
650 ifp->if_type = IFT_BRIDGE;
652 mtx_lock(&bridge_list_mtx);
653 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
654 mtx_unlock(&bridge_list_mtx);
660 * bridge_clone_destroy:
662 * Destroy a bridge instance.
665 bridge_clone_destroy(struct ifnet *ifp)
667 struct bridge_softc *sc = ifp->if_softc;
668 struct bridge_iflist *bif;
673 ifp->if_flags &= ~IFF_UP;
675 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
676 bridge_delete_member(sc, bif, 0);
678 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
679 bridge_delete_span(sc, bif);
684 callout_drain(&sc->sc_brcallout);
686 mtx_lock(&bridge_list_mtx);
687 LIST_REMOVE(sc, sc_list);
688 mtx_unlock(&bridge_list_mtx);
690 bstp_detach(&sc->sc_stp);
692 if_free_type(ifp, IFT_ETHER);
694 /* Tear down the routing table. */
695 bridge_rtable_fini(sc);
697 BRIDGE_LOCK_DESTROY(sc);
704 * Handle a control request from the operator.
707 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
709 struct bridge_softc *sc = ifp->if_softc;
710 struct ifreq *ifr = (struct ifreq *)data;
711 struct bridge_iflist *bif;
712 struct thread *td = curthread;
714 struct ifbreq ifbreq;
715 struct ifbifconf ifbifconf;
716 struct ifbareq ifbareq;
717 struct ifbaconf ifbaconf;
718 struct ifbrparam ifbrparam;
719 struct ifbropreq ifbropreq;
721 struct ifdrv *ifd = (struct ifdrv *) data;
722 const struct bridge_control *bc;
733 if (ifd->ifd_cmd >= bridge_control_table_size) {
737 bc = &bridge_control_table[ifd->ifd_cmd];
739 if (cmd == SIOCGDRVSPEC &&
740 (bc->bc_flags & BC_F_COPYOUT) == 0) {
744 else if (cmd == SIOCSDRVSPEC &&
745 (bc->bc_flags & BC_F_COPYOUT) != 0) {
750 if (bc->bc_flags & BC_F_SUSER) {
751 error = priv_check(td, PRIV_NET_BRIDGE);
756 if (ifd->ifd_len != bc->bc_argsize ||
757 ifd->ifd_len > sizeof(args)) {
762 bzero(&args, sizeof(args));
763 if (bc->bc_flags & BC_F_COPYIN) {
764 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
770 error = (*bc->bc_func)(sc, &args);
775 if (bc->bc_flags & BC_F_COPYOUT)
776 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
781 if (!(ifp->if_flags & IFF_UP) &&
782 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
784 * If interface is marked down and it is running,
785 * then stop and disable it.
790 } else if ((ifp->if_flags & IFF_UP) &&
791 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
793 * If interface is marked up and it is stopped, then
801 if (ifr->ifr_mtu < 576) {
805 if (LIST_EMPTY(&sc->sc_iflist)) {
806 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
810 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
811 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
812 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
813 " != %d\n", sc->sc_ifp->if_xname,
814 bif->bif_ifp->if_mtu,
815 bif->bif_ifp->if_xname, ifr->ifr_mtu);
821 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
826 * drop the lock as ether_ioctl() will call bridge_start() and
827 * cause the lock to be recursed.
829 error = ether_ioctl(ifp, cmd, data);
839 * Clear or restore unwanted capabilities on the member interface
842 bridge_mutecaps(struct bridge_softc *sc)
844 struct bridge_iflist *bif;
847 /* Initial bitmask of capabilities to test */
848 mask = BRIDGE_IFCAPS_MASK;
850 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
851 /* Every member must support it or its disabled */
852 mask &= bif->bif_savedcaps;
855 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
856 enabled = bif->bif_ifp->if_capenable;
857 enabled &= ~BRIDGE_IFCAPS_STRIP;
858 /* strip off mask bits and enable them again if allowed */
859 enabled &= ~BRIDGE_IFCAPS_MASK;
861 bridge_set_ifcap(sc, bif, enabled);
867 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
869 struct ifnet *ifp = bif->bif_ifp;
873 bzero(&ifr, sizeof(ifr));
874 ifr.ifr_reqcap = set;
876 if (ifp->if_capenable != set) {
877 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
879 if_printf(sc->sc_ifp,
880 "error setting interface capabilities on %s\n",
886 * bridge_lookup_member:
888 * Lookup a bridge member interface.
890 static struct bridge_iflist *
891 bridge_lookup_member(struct bridge_softc *sc, const char *name)
893 struct bridge_iflist *bif;
896 BRIDGE_LOCK_ASSERT(sc);
898 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
900 if (strcmp(ifp->if_xname, name) == 0)
908 * bridge_lookup_member_if:
910 * Lookup a bridge member interface by ifnet*.
912 static struct bridge_iflist *
913 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
915 struct bridge_iflist *bif;
917 BRIDGE_LOCK_ASSERT(sc);
919 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
920 if (bif->bif_ifp == member_ifp)
928 * bridge_delete_member:
930 * Delete the specified member interface.
933 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
936 struct ifnet *ifs = bif->bif_ifp;
937 struct ifnet *fif = NULL;
939 BRIDGE_LOCK_ASSERT(sc);
941 if (bif->bif_flags & IFBIF_STP)
942 bstp_disable(&bif->bif_stp);
944 ifs->if_bridge = NULL;
946 LIST_REMOVE(bif, bif_next);
950 * If removing the interface that gave the bridge its mac address, set
951 * the mac address of the bridge to the address of the next member, or
952 * to its default address if no members are left.
954 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
955 if (LIST_EMPTY(&sc->sc_iflist)) {
956 bcopy(sc->sc_defaddr,
957 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
958 sc->sc_ifaddr = NULL;
960 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
961 bcopy(IF_LLADDR(fif),
962 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
965 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
968 bridge_linkcheck(sc);
969 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
970 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
971 KASSERT(bif->bif_addrcnt == 0,
972 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
976 switch (ifs->if_type) {
980 * Take the interface out of promiscuous mode.
982 (void) ifpromisc(ifs, 0);
990 panic("bridge_delete_member: impossible");
994 /* reneable any interface capabilities */
995 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
997 bstp_destroy(&bif->bif_stp); /* prepare to free */
1003 * bridge_delete_span:
1005 * Delete the specified span interface.
1008 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1010 BRIDGE_LOCK_ASSERT(sc);
1012 KASSERT(bif->bif_ifp->if_bridge == NULL,
1013 ("%s: not a span interface", __func__));
1015 LIST_REMOVE(bif, bif_next);
1016 free(bif, M_DEVBUF);
1020 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1022 struct ifbreq *req = arg;
1023 struct bridge_iflist *bif = NULL;
1027 ifs = ifunit(req->ifbr_ifsname);
1030 if (ifs->if_ioctl == NULL) /* must be supported */
1033 /* If it's in the span list, it can't be a member. */
1034 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1035 if (ifs == bif->bif_ifp)
1038 if (ifs->if_bridge == sc)
1041 if (ifs->if_bridge != NULL)
1044 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1049 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1050 bif->bif_savedcaps = ifs->if_capenable;
1052 switch (ifs->if_type) {
1056 /* permitted interface types */
1063 /* Allow the first Ethernet member to define the MTU */
1064 if (LIST_EMPTY(&sc->sc_iflist))
1065 sc->sc_ifp->if_mtu = ifs->if_mtu;
1066 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1067 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1068 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1074 * Assign the interface's MAC address to the bridge if it's the first
1075 * member and the MAC address of the bridge has not been changed from
1076 * the default randomly generated one.
1078 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1079 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1080 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1081 sc->sc_ifaddr = ifs;
1082 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1085 ifs->if_bridge = sc;
1086 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1088 * XXX: XLOCK HERE!?!
1090 * NOTE: insert_***HEAD*** should be safe for the traversals.
1092 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1094 /* Set interface capabilities to the intersection set of all members */
1095 bridge_mutecaps(sc);
1096 bridge_linkcheck(sc);
1098 /* Place the interface into promiscuous mode */
1099 switch (ifs->if_type) {
1103 error = ifpromisc(ifs, 1);
1108 bridge_delete_member(sc, bif, 0);
1112 free(bif, M_DEVBUF);
1118 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1120 struct ifbreq *req = arg;
1121 struct bridge_iflist *bif;
1123 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1127 bridge_delete_member(sc, bif, 0);
1133 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1135 struct ifbreq *req = arg;
1136 struct bridge_iflist *bif;
1137 struct bstp_port *bp;
1139 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1144 req->ifbr_ifsflags = bif->bif_flags;
1145 req->ifbr_state = bp->bp_state;
1146 req->ifbr_priority = bp->bp_priority;
1147 req->ifbr_path_cost = bp->bp_path_cost;
1148 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1149 req->ifbr_proto = bp->bp_protover;
1150 req->ifbr_role = bp->bp_role;
1151 req->ifbr_stpflags = bp->bp_flags;
1152 req->ifbr_addrcnt = bif->bif_addrcnt;
1153 req->ifbr_addrmax = bif->bif_addrmax;
1154 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1156 /* Copy STP state options as flags */
1157 if (bp->bp_operedge)
1158 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1159 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1160 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1161 if (bp->bp_ptp_link)
1162 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1163 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1164 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1165 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1166 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1167 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1168 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1173 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1175 struct ifbreq *req = arg;
1176 struct bridge_iflist *bif;
1177 struct bstp_port *bp;
1180 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1185 if (req->ifbr_ifsflags & IFBIF_SPAN)
1186 /* SPAN is readonly */
1189 if (req->ifbr_ifsflags & IFBIF_STP) {
1190 if ((bif->bif_flags & IFBIF_STP) == 0) {
1191 error = bstp_enable(&bif->bif_stp);
1196 if ((bif->bif_flags & IFBIF_STP) != 0)
1197 bstp_disable(&bif->bif_stp);
1200 /* Pass on STP flags */
1201 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1202 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1203 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1204 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1206 /* Save the bits relating to the bridge */
1207 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1213 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1215 struct ifbrparam *param = arg;
1217 sc->sc_brtmax = param->ifbrp_csize;
1224 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1226 struct ifbrparam *param = arg;
1228 param->ifbrp_csize = sc->sc_brtmax;
1234 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1236 struct ifbifconf *bifc = arg;
1237 struct bridge_iflist *bif;
1240 int count, buflen, len, error = 0;
1243 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1245 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1248 buflen = sizeof(breq) * count;
1249 if (bifc->ifbic_len == 0) {
1250 bifc->ifbic_len = buflen;
1254 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1259 len = min(bifc->ifbic_len, buflen);
1260 bzero(&breq, sizeof(breq));
1261 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1262 if (len < sizeof(breq))
1265 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1266 sizeof(breq.ifbr_ifsname));
1267 /* Fill in the ifbreq structure */
1268 error = bridge_ioctl_gifflags(sc, &breq);
1271 memcpy(buf, &breq, sizeof(breq));
1273 buf += sizeof(breq);
1274 len -= sizeof(breq);
1276 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1277 if (len < sizeof(breq))
1280 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1281 sizeof(breq.ifbr_ifsname));
1282 breq.ifbr_ifsflags = bif->bif_flags;
1283 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1284 memcpy(buf, &breq, sizeof(breq));
1286 buf += sizeof(breq);
1287 len -= sizeof(breq);
1291 bifc->ifbic_len = sizeof(breq) * count;
1292 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1294 free(outbuf, M_TEMP);
1299 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1301 struct ifbaconf *bac = arg;
1302 struct bridge_rtnode *brt;
1303 struct ifbareq bareq;
1305 int count, buflen, len, error = 0;
1307 if (bac->ifbac_len == 0)
1311 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1313 buflen = sizeof(bareq) * count;
1316 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1321 len = min(bac->ifbac_len, buflen);
1322 bzero(&bareq, sizeof(bareq));
1323 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1324 if (len < sizeof(bareq))
1326 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1327 sizeof(bareq.ifba_ifsname));
1328 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1329 bareq.ifba_vlan = brt->brt_vlan;
1330 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1331 time_uptime < brt->brt_expire)
1332 bareq.ifba_expire = brt->brt_expire - time_uptime;
1334 bareq.ifba_expire = 0;
1335 bareq.ifba_flags = brt->brt_flags;
1337 memcpy(buf, &bareq, sizeof(bareq));
1339 buf += sizeof(bareq);
1340 len -= sizeof(bareq);
1344 bac->ifbac_len = sizeof(bareq) * count;
1345 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1347 free(outbuf, M_TEMP);
1352 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1354 struct ifbareq *req = arg;
1355 struct bridge_iflist *bif;
1358 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1362 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1369 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1371 struct ifbrparam *param = arg;
1373 sc->sc_brttimeout = param->ifbrp_ctime;
1378 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1380 struct ifbrparam *param = arg;
1382 param->ifbrp_ctime = sc->sc_brttimeout;
1387 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1389 struct ifbareq *req = arg;
1391 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1395 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1397 struct ifbreq *req = arg;
1399 bridge_rtflush(sc, req->ifbr_ifsflags);
1404 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1406 struct ifbrparam *param = arg;
1407 struct bstp_state *bs = &sc->sc_stp;
1409 param->ifbrp_prio = bs->bs_bridge_priority;
1414 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1416 struct ifbrparam *param = arg;
1418 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1422 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1424 struct ifbrparam *param = arg;
1425 struct bstp_state *bs = &sc->sc_stp;
1427 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1432 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1434 struct ifbrparam *param = arg;
1436 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1440 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1442 struct ifbrparam *param = arg;
1443 struct bstp_state *bs = &sc->sc_stp;
1445 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1450 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1452 struct ifbrparam *param = arg;
1454 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1458 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1460 struct ifbrparam *param = arg;
1461 struct bstp_state *bs = &sc->sc_stp;
1463 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1468 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1470 struct ifbrparam *param = arg;
1472 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1476 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1478 struct ifbreq *req = arg;
1479 struct bridge_iflist *bif;
1481 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1485 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1489 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1491 struct ifbreq *req = arg;
1492 struct bridge_iflist *bif;
1494 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1498 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1502 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1504 struct ifbreq *req = arg;
1505 struct bridge_iflist *bif;
1507 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1511 bif->bif_addrmax = req->ifbr_addrmax;
1516 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1518 struct ifbreq *req = arg;
1519 struct bridge_iflist *bif = NULL;
1522 ifs = ifunit(req->ifbr_ifsname);
1526 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1527 if (ifs == bif->bif_ifp)
1530 if (ifs->if_bridge != NULL)
1533 switch (ifs->if_type) {
1542 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1547 bif->bif_flags = IFBIF_SPAN;
1549 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1555 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1557 struct ifbreq *req = arg;
1558 struct bridge_iflist *bif;
1561 ifs = ifunit(req->ifbr_ifsname);
1565 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1566 if (ifs == bif->bif_ifp)
1572 bridge_delete_span(sc, bif);
1578 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1580 struct ifbropreq *req = arg;
1581 struct bstp_state *bs = &sc->sc_stp;
1582 struct bstp_port *root_port;
1584 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1585 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1586 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1588 root_port = bs->bs_root_port;
1589 if (root_port == NULL)
1590 req->ifbop_root_port = 0;
1592 req->ifbop_root_port = root_port->bp_ifp->if_index;
1594 req->ifbop_holdcount = bs->bs_txholdcount;
1595 req->ifbop_priority = bs->bs_bridge_priority;
1596 req->ifbop_protocol = bs->bs_protover;
1597 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1598 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1599 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1600 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1601 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1602 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1608 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1610 struct ifbrparam *param = arg;
1612 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1617 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1619 struct ifbpstpconf *bifstp = arg;
1620 struct bridge_iflist *bif;
1621 struct bstp_port *bp;
1622 struct ifbpstpreq bpreq;
1624 int count, buflen, len, error = 0;
1627 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1628 if ((bif->bif_flags & IFBIF_STP) != 0)
1632 buflen = sizeof(bpreq) * count;
1633 if (bifstp->ifbpstp_len == 0) {
1634 bifstp->ifbpstp_len = buflen;
1639 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1644 len = min(bifstp->ifbpstp_len, buflen);
1645 bzero(&bpreq, sizeof(bpreq));
1646 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1647 if (len < sizeof(bpreq))
1650 if ((bif->bif_flags & IFBIF_STP) == 0)
1654 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1655 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1656 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1657 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1658 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1659 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1661 memcpy(buf, &bpreq, sizeof(bpreq));
1663 buf += sizeof(bpreq);
1664 len -= sizeof(bpreq);
1668 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1669 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1671 free(outbuf, M_TEMP);
1676 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1678 struct ifbrparam *param = arg;
1680 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1684 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1686 struct ifbrparam *param = arg;
1688 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1694 * Detach an interface from a bridge. Called when a member
1695 * interface is detaching.
1698 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1700 struct bridge_softc *sc = ifp->if_bridge;
1701 struct bridge_iflist *bif;
1703 /* Check if the interface is a bridge member */
1707 bif = bridge_lookup_member_if(sc, ifp);
1709 bridge_delete_member(sc, bif, 1);
1715 /* Check if the interface is a span port */
1716 mtx_lock(&bridge_list_mtx);
1717 LIST_FOREACH(sc, &bridge_list, sc_list) {
1719 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1720 if (ifp == bif->bif_ifp) {
1721 bridge_delete_span(sc, bif);
1727 mtx_unlock(&bridge_list_mtx);
1733 * Initialize a bridge interface.
1736 bridge_init(void *xsc)
1738 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1739 struct ifnet *ifp = sc->sc_ifp;
1741 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1745 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1748 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1749 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1757 * Stop the bridge interface.
1760 bridge_stop(struct ifnet *ifp, int disable)
1762 struct bridge_softc *sc = ifp->if_softc;
1764 BRIDGE_LOCK_ASSERT(sc);
1766 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1769 callout_stop(&sc->sc_brcallout);
1770 bstp_stop(&sc->sc_stp);
1772 bridge_rtflush(sc, IFBF_FLUSHDYN);
1774 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1780 * Enqueue a packet on a bridge member interface.
1784 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1790 len = m->m_pkthdr.len;
1791 mflags = m->m_flags;
1793 /* We may be sending a fragment so traverse the mbuf */
1796 m->m_nextpkt = NULL;
1799 * If underlying interface can not do VLAN tag insertion itself
1800 * then attach a packet tag that holds it.
1802 if ((m->m_flags & M_VLANTAG) &&
1803 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1804 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1807 "unable to prepend VLAN header\n");
1808 dst_ifp->if_oerrors++;
1811 m->m_flags &= ~M_VLANTAG;
1815 dst_ifp->if_transmit(dst_ifp, m);
1819 sc->sc_ifp->if_opackets++;
1820 sc->sc_ifp->if_obytes += len;
1821 if (mflags & M_MCAST)
1822 sc->sc_ifp->if_omcasts++;
1829 * Receive a queued packet from dummynet and pass it on to the output
1832 * The mbuf has the Ethernet header already attached.
1835 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1837 struct bridge_softc *sc;
1839 sc = ifp->if_bridge;
1842 * The packet didnt originate from a member interface. This should only
1843 * ever happen if a member interface is removed while packets are
1851 if (PFIL_HOOKED(&V_inet_pfil_hook)
1853 || PFIL_HOOKED(&V_inet6_pfil_hook)
1856 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1862 bridge_enqueue(sc, ifp, m);
1868 * Send output from a bridge member interface. This
1869 * performs the bridging function for locally originated
1872 * The mbuf has the Ethernet header already attached. We must
1873 * enqueue or free the mbuf before returning.
1876 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1879 struct ether_header *eh;
1880 struct ifnet *dst_if;
1881 struct bridge_softc *sc;
1884 if (m->m_len < ETHER_HDR_LEN) {
1885 m = m_pullup(m, ETHER_HDR_LEN);
1890 eh = mtod(m, struct ether_header *);
1891 sc = ifp->if_bridge;
1892 vlan = VLANTAGOF(m);
1897 * If bridge is down, but the original output interface is up,
1898 * go ahead and send out that interface. Otherwise, the packet
1901 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1907 * If the packet is a multicast, or we don't know a better way to
1908 * get there, send to all interfaces.
1910 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1913 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1914 if (dst_if == NULL) {
1915 struct bridge_iflist *bif;
1917 int error = 0, used = 0;
1921 BRIDGE_LOCK2REF(sc, error);
1927 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1928 dst_if = bif->bif_ifp;
1930 if (dst_if->if_type == IFT_GIF)
1932 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1936 * If this is not the original output interface,
1937 * and the interface is participating in spanning
1938 * tree, make sure the port is in a state that
1939 * allows forwarding.
1941 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1942 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1945 if (LIST_NEXT(bif, bif_next) == NULL) {
1949 mc = m_copypacket(m, M_DONTWAIT);
1951 sc->sc_ifp->if_oerrors++;
1956 bridge_enqueue(sc, dst_if, mc);
1966 * XXX Spanning tree consideration here?
1970 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1977 bridge_enqueue(sc, dst_if, m);
1984 * Start output on a bridge.
1988 bridge_start(struct ifnet *ifp)
1990 struct bridge_softc *sc;
1992 struct ether_header *eh;
1993 struct ifnet *dst_if;
1997 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1999 IFQ_DEQUEUE(&ifp->if_snd, m);
2002 ETHER_BPF_MTAP(ifp, m);
2004 eh = mtod(m, struct ether_header *);
2008 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2009 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1);
2013 bridge_broadcast(sc, ifp, m, 0);
2016 bridge_enqueue(sc, dst_if, m);
2019 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
2025 * The forwarding function of the bridge.
2027 * NOTE: Releases the lock on return.
2030 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2033 struct bridge_iflist *dbif;
2034 struct ifnet *src_if, *dst_if, *ifp;
2035 struct ether_header *eh;
2040 src_if = m->m_pkthdr.rcvif;
2044 ifp->if_ibytes += m->m_pkthdr.len;
2045 vlan = VLANTAGOF(m);
2047 if ((sbif->bif_flags & IFBIF_STP) &&
2048 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2051 eh = mtod(m, struct ether_header *);
2052 dst = eh->ether_dhost;
2054 /* If the interface is learning, record the address. */
2055 if (sbif->bif_flags & IFBIF_LEARNING) {
2056 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2057 sbif, 0, IFBAF_DYNAMIC);
2059 * If the interface has addresses limits then deny any source
2060 * that is not in the cache.
2062 if (error && sbif->bif_addrmax)
2066 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2067 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2071 * At this point, the port either doesn't participate
2072 * in spanning tree or it is in the forwarding state.
2076 * If the packet is unicast, destined for someone on
2077 * "this" side of the bridge, drop it.
2079 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2080 dst_if = bridge_rtlookup(sc, dst, vlan);
2081 if (src_if == dst_if)
2085 * Check if its a reserved multicast address, any address
2086 * listed in 802.1D section 7.12.6 may not be forwarded by the
2088 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2090 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2091 dst[2] == 0xc2 && dst[3] == 0x00 &&
2092 dst[4] == 0x00 && dst[5] <= 0x0f)
2095 /* ...forward it to all interfaces. */
2101 * If we have a destination interface which is a member of our bridge,
2102 * OR this is a unicast packet, push it through the bpf(4) machinery.
2103 * For broadcast or multicast packets, don't bother because it will
2104 * be reinjected into ether_input. We do this before we pass the packets
2105 * through the pfil(9) framework, as it is possible that pfil(9) will
2106 * drop the packet, or possibly modify it, making it difficult to debug
2107 * firewall issues on the bridge.
2109 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2110 ETHER_BPF_MTAP(ifp, m);
2112 /* run the packet filter */
2113 if (PFIL_HOOKED(&V_inet_pfil_hook)
2115 || PFIL_HOOKED(&V_inet6_pfil_hook)
2119 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2126 if (dst_if == NULL) {
2127 bridge_broadcast(sc, src_if, m, 1);
2132 * At this point, we're dealing with a unicast frame
2133 * going to a different interface.
2135 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2138 dbif = bridge_lookup_member_if(sc, dst_if);
2140 /* Not a member of the bridge (anymore?) */
2143 /* Private segments can not talk to each other */
2144 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2147 if ((dbif->bif_flags & IFBIF_STP) &&
2148 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2153 if (PFIL_HOOKED(&V_inet_pfil_hook)
2155 || PFIL_HOOKED(&V_inet6_pfil_hook)
2158 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2164 bridge_enqueue(sc, dst_if, m);
2175 * Receive input from a member interface. Queue the packet for
2176 * bridging if it is not for us.
2178 static struct mbuf *
2179 bridge_input(struct ifnet *ifp, struct mbuf *m)
2181 struct bridge_softc *sc = ifp->if_bridge;
2182 struct bridge_iflist *bif, *bif2;
2184 struct ether_header *eh;
2185 struct mbuf *mc, *mc2;
2189 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2193 vlan = VLANTAGOF(m);
2196 * Implement support for bridge monitoring. If this flag has been
2197 * set on this interface, discard the packet once we push it through
2198 * the bpf(4) machinery, but before we do, increment the byte and
2199 * packet counters associated with this interface.
2201 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2202 m->m_pkthdr.rcvif = bifp;
2203 ETHER_BPF_MTAP(bifp, m);
2204 bifp->if_ipackets++;
2205 bifp->if_ibytes += m->m_pkthdr.len;
2210 bif = bridge_lookup_member_if(sc, ifp);
2216 eh = mtod(m, struct ether_header *);
2220 if (m->m_flags & (M_BCAST|M_MCAST)) {
2221 /* Tap off 802.1D packets; they do not get forwarded. */
2222 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2223 ETHER_ADDR_LEN) == 0) {
2224 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2229 if ((bif->bif_flags & IFBIF_STP) &&
2230 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2236 * Make a deep copy of the packet and enqueue the copy
2237 * for bridge processing; return the original packet for
2240 mc = m_dup(m, M_DONTWAIT);
2246 /* Perform the bridge forwarding function with the copy. */
2247 bridge_forward(sc, bif, mc);
2250 * Reinject the mbuf as arriving on the bridge so we have a
2251 * chance at claiming multicast packets. We can not loop back
2252 * here from ether_input as a bridge is never a member of a
2255 KASSERT(bifp->if_bridge == NULL,
2256 ("loop created in bridge_input"));
2257 mc2 = m_dup(m, M_DONTWAIT);
2259 /* Keep the layer3 header aligned */
2260 int i = min(mc2->m_pkthdr.len, max_protohdr);
2261 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2264 mc2->m_pkthdr.rcvif = bifp;
2265 (*bifp->if_input)(bifp, mc2);
2268 /* Return the original packet for local processing. */
2272 if ((bif->bif_flags & IFBIF_STP) &&
2273 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2278 #if (defined(INET) || defined(INET6))
2279 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2280 || ((iface)->if_carp \
2281 && (*carp_forus_p)((iface), eh->ether_dhost))
2282 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2283 || ((iface)->if_carp \
2284 && (*carp_forus_p)((iface), eh->ether_shost))
2286 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2287 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2291 # define OR_PFIL_HOOKED_INET6 \
2292 || PFIL_HOOKED(&V_inet6_pfil_hook)
2294 # define OR_PFIL_HOOKED_INET6
2297 #define GRAB_OUR_PACKETS(iface) \
2298 if ((iface)->if_type == IFT_GIF) \
2300 /* It is destined for us. */ \
2301 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2302 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2304 if ((iface)->if_type == IFT_BRIDGE) { \
2305 ETHER_BPF_MTAP(iface, m); \
2306 iface->if_ipackets++; \
2307 /* Filter on the physical interface. */ \
2308 if (pfil_local_phys && \
2309 (PFIL_HOOKED(&V_inet_pfil_hook) \
2310 OR_PFIL_HOOKED_INET6)) { \
2311 if (bridge_pfil(&m, NULL, ifp, \
2312 PFIL_IN) != 0 || m == NULL) { \
2313 BRIDGE_UNLOCK(sc); \
2318 if (bif->bif_flags & IFBIF_LEARNING) { \
2319 error = bridge_rtupdate(sc, eh->ether_shost, \
2320 vlan, bif, 0, IFBAF_DYNAMIC); \
2321 if (error && bif->bif_addrmax) { \
2322 BRIDGE_UNLOCK(sc); \
2327 m->m_pkthdr.rcvif = iface; \
2328 BRIDGE_UNLOCK(sc); \
2332 /* We just received a packet that we sent out. */ \
2333 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2334 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2336 BRIDGE_UNLOCK(sc); \
2342 * Unicast. Make sure it's not for the bridge.
2344 do { GRAB_OUR_PACKETS(bifp) } while (0);
2347 * Give a chance for ifp at first priority. This will help when the
2348 * packet comes through the interface like VLAN's with the same MACs
2349 * on several interfaces from the same bridge. This also will save
2350 * some CPU cycles in case the destination interface and the input
2351 * interface (eq ifp) are the same.
2353 do { GRAB_OUR_PACKETS(ifp) } while (0);
2355 /* Now check the all bridge members. */
2356 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2357 GRAB_OUR_PACKETS(bif2->bif_ifp)
2360 #undef OR_CARP_CHECK_WE_ARE_DST
2361 #undef OR_CARP_CHECK_WE_ARE_SRC
2362 #undef OR_PFIL_HOOKED_INET6
2363 #undef GRAB_OUR_PACKETS
2365 /* Perform the bridge forwarding function. */
2366 bridge_forward(sc, bif, m);
2374 * Send a frame to all interfaces that are members of
2375 * the bridge, except for the one on which the packet
2378 * NOTE: Releases the lock on return.
2381 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2382 struct mbuf *m, int runfilt)
2384 struct bridge_iflist *dbif, *sbif;
2386 struct ifnet *dst_if;
2387 int error = 0, used = 0, i;
2389 sbif = bridge_lookup_member_if(sc, src_if);
2391 BRIDGE_LOCK2REF(sc, error);
2397 /* Filter on the bridge interface before broadcasting */
2398 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2400 || PFIL_HOOKED(&V_inet6_pfil_hook)
2403 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2409 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2410 dst_if = dbif->bif_ifp;
2411 if (dst_if == src_if)
2414 /* Private segments can not talk to each other */
2415 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2418 if ((dbif->bif_flags & IFBIF_STP) &&
2419 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2422 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2423 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2426 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2429 if (LIST_NEXT(dbif, bif_next) == NULL) {
2433 mc = m_dup(m, M_DONTWAIT);
2435 sc->sc_ifp->if_oerrors++;
2441 * Filter on the output interface. Pass a NULL bridge interface
2442 * pointer so we do not redundantly filter on the bridge for
2443 * each interface we broadcast on.
2445 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2447 || PFIL_HOOKED(&V_inet6_pfil_hook)
2451 /* Keep the layer3 header aligned */
2452 i = min(mc->m_pkthdr.len, max_protohdr);
2453 mc = m_copyup(mc, i, ETHER_ALIGN);
2455 sc->sc_ifp->if_oerrors++;
2459 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2465 bridge_enqueue(sc, dst_if, mc);
2477 * Duplicate a packet out one or more interfaces that are in span mode,
2478 * the original mbuf is unmodified.
2481 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2483 struct bridge_iflist *bif;
2484 struct ifnet *dst_if;
2487 if (LIST_EMPTY(&sc->sc_spanlist))
2490 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2491 dst_if = bif->bif_ifp;
2493 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2496 mc = m_copypacket(m, M_DONTWAIT);
2498 sc->sc_ifp->if_oerrors++;
2502 bridge_enqueue(sc, dst_if, mc);
2509 * Add a bridge routing entry.
2512 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2513 struct bridge_iflist *bif, int setflags, uint8_t flags)
2515 struct bridge_rtnode *brt;
2518 BRIDGE_LOCK_ASSERT(sc);
2520 /* Check the source address is valid and not multicast. */
2521 if (ETHER_IS_MULTICAST(dst) ||
2522 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2523 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2526 /* 802.1p frames map to vlan 1 */
2531 * A route for this destination might already exist. If so,
2532 * update it, otherwise create a new one.
2534 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2535 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2536 sc->sc_brtexceeded++;
2539 /* Check per interface address limits (if enabled) */
2540 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2541 bif->bif_addrexceeded++;
2546 * Allocate a new bridge forwarding node, and
2547 * initialize the expiration time and Ethernet
2550 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2554 if (bif->bif_flags & IFBIF_STICKY)
2555 brt->brt_flags = IFBAF_STICKY;
2557 brt->brt_flags = IFBAF_DYNAMIC;
2559 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2560 brt->brt_vlan = vlan;
2562 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2563 uma_zfree(bridge_rtnode_zone, brt);
2570 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2571 brt->brt_dst != bif) {
2572 brt->brt_dst->bif_addrcnt--;
2574 brt->brt_dst->bif_addrcnt++;
2577 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2578 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2580 brt->brt_flags = flags;
2588 * Lookup the destination interface for an address.
2590 static struct ifnet *
2591 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2593 struct bridge_rtnode *brt;
2595 BRIDGE_LOCK_ASSERT(sc);
2597 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2600 return (brt->brt_ifp);
2606 * Trim the routine table so that we have a number
2607 * of routing entries less than or equal to the
2611 bridge_rttrim(struct bridge_softc *sc)
2613 struct bridge_rtnode *brt, *nbrt;
2615 BRIDGE_LOCK_ASSERT(sc);
2617 /* Make sure we actually need to do this. */
2618 if (sc->sc_brtcnt <= sc->sc_brtmax)
2621 /* Force an aging cycle; this might trim enough addresses. */
2623 if (sc->sc_brtcnt <= sc->sc_brtmax)
2626 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2627 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2628 bridge_rtnode_destroy(sc, brt);
2629 if (sc->sc_brtcnt <= sc->sc_brtmax)
2638 * Aging timer for the bridge.
2641 bridge_timer(void *arg)
2643 struct bridge_softc *sc = arg;
2645 BRIDGE_LOCK_ASSERT(sc);
2649 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2650 callout_reset(&sc->sc_brcallout,
2651 bridge_rtable_prune_period * hz, bridge_timer, sc);
2657 * Perform an aging cycle.
2660 bridge_rtage(struct bridge_softc *sc)
2662 struct bridge_rtnode *brt, *nbrt;
2664 BRIDGE_LOCK_ASSERT(sc);
2666 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2667 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2668 if (time_uptime >= brt->brt_expire)
2669 bridge_rtnode_destroy(sc, brt);
2677 * Remove all dynamic addresses from the bridge.
2680 bridge_rtflush(struct bridge_softc *sc, int full)
2682 struct bridge_rtnode *brt, *nbrt;
2684 BRIDGE_LOCK_ASSERT(sc);
2686 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2687 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2688 bridge_rtnode_destroy(sc, brt);
2695 * Remove an address from the table.
2698 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2700 struct bridge_rtnode *brt;
2703 BRIDGE_LOCK_ASSERT(sc);
2706 * If vlan is zero then we want to delete for all vlans so the lookup
2707 * may return more than one.
2709 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2710 bridge_rtnode_destroy(sc, brt);
2714 return (found ? 0 : ENOENT);
2720 * Delete routes to a speicifc member interface.
2723 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2725 struct bridge_rtnode *brt, *nbrt;
2727 BRIDGE_LOCK_ASSERT(sc);
2729 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2730 if (brt->brt_ifp == ifp && (full ||
2731 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2732 bridge_rtnode_destroy(sc, brt);
2737 * bridge_rtable_init:
2739 * Initialize the route table for this bridge.
2742 bridge_rtable_init(struct bridge_softc *sc)
2746 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2747 M_DEVBUF, M_NOWAIT);
2748 if (sc->sc_rthash == NULL)
2751 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2752 LIST_INIT(&sc->sc_rthash[i]);
2754 sc->sc_rthash_key = arc4random();
2756 LIST_INIT(&sc->sc_rtlist);
2762 * bridge_rtable_fini:
2764 * Deconstruct the route table for this bridge.
2767 bridge_rtable_fini(struct bridge_softc *sc)
2770 KASSERT(sc->sc_brtcnt == 0,
2771 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2772 free(sc->sc_rthash, M_DEVBUF);
2776 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2777 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2779 #define mix(a, b, c) \
2781 a -= b; a -= c; a ^= (c >> 13); \
2782 b -= c; b -= a; b ^= (a << 8); \
2783 c -= a; c -= b; c ^= (b >> 13); \
2784 a -= b; a -= c; a ^= (c >> 12); \
2785 b -= c; b -= a; b ^= (a << 16); \
2786 c -= a; c -= b; c ^= (b >> 5); \
2787 a -= b; a -= c; a ^= (c >> 3); \
2788 b -= c; b -= a; b ^= (a << 10); \
2789 c -= a; c -= b; c ^= (b >> 15); \
2790 } while (/*CONSTCOND*/0)
2792 static __inline uint32_t
2793 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2795 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2806 return (c & BRIDGE_RTHASH_MASK);
2812 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2816 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2817 d = ((int)a[i]) - ((int)b[i]);
2824 * bridge_rtnode_lookup:
2826 * Look up a bridge route node for the specified destination. Compare the
2827 * vlan id or if zero then just return the first match.
2829 static struct bridge_rtnode *
2830 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2832 struct bridge_rtnode *brt;
2836 BRIDGE_LOCK_ASSERT(sc);
2838 hash = bridge_rthash(sc, addr);
2839 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2840 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2841 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2851 * bridge_rtnode_insert:
2853 * Insert the specified bridge node into the route table. We
2854 * assume the entry is not already in the table.
2857 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2859 struct bridge_rtnode *lbrt;
2863 BRIDGE_LOCK_ASSERT(sc);
2865 hash = bridge_rthash(sc, brt->brt_addr);
2867 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2869 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2874 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2875 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2878 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2881 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2882 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2885 lbrt = LIST_NEXT(lbrt, brt_hash);
2886 } while (lbrt != NULL);
2889 panic("bridge_rtnode_insert: impossible");
2893 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2900 * bridge_rtnode_destroy:
2902 * Destroy a bridge rtnode.
2905 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2907 BRIDGE_LOCK_ASSERT(sc);
2909 LIST_REMOVE(brt, brt_hash);
2911 LIST_REMOVE(brt, brt_list);
2913 brt->brt_dst->bif_addrcnt--;
2914 uma_zfree(bridge_rtnode_zone, brt);
2918 * bridge_rtable_expire:
2920 * Set the expiry time for all routes on an interface.
2923 bridge_rtable_expire(struct ifnet *ifp, int age)
2925 struct bridge_softc *sc = ifp->if_bridge;
2926 struct bridge_rtnode *brt;
2931 * If the age is zero then flush, otherwise set all the expiry times to
2932 * age for the interface
2935 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2937 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2938 /* Cap the expiry time to 'age' */
2939 if (brt->brt_ifp == ifp &&
2940 brt->brt_expire > time_uptime + age &&
2941 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2942 brt->brt_expire = time_uptime + age;
2949 * bridge_state_change:
2951 * Callback from the bridgestp code when a port changes states.
2954 bridge_state_change(struct ifnet *ifp, int state)
2956 struct bridge_softc *sc = ifp->if_bridge;
2957 static const char *stpstates[] = {
2967 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
2968 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
2972 * Send bridge packets through pfil if they are one of the types pfil can deal
2973 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
2974 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2978 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2980 int snap, error, i, hlen;
2981 struct ether_header *eh1, eh2;
2982 struct ip_fw_args args;
2985 u_int16_t ether_type;
2988 error = -1; /* Default error if not error == 0 */
2991 /* we may return with the IP fields swapped, ensure its not shared */
2992 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
2995 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
2996 return (0); /* filtering is disabled */
2998 i = min((*mp)->m_pkthdr.len, max_protohdr);
2999 if ((*mp)->m_len < i) {
3000 *mp = m_pullup(*mp, i);
3002 printf("%s: m_pullup failed\n", __func__);
3007 eh1 = mtod(*mp, struct ether_header *);
3008 ether_type = ntohs(eh1->ether_type);
3011 * Check for SNAP/LLC.
3013 if (ether_type < ETHERMTU) {
3014 struct llc *llc2 = (struct llc *)(eh1 + 1);
3016 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3017 llc2->llc_dsap == LLC_SNAP_LSAP &&
3018 llc2->llc_ssap == LLC_SNAP_LSAP &&
3019 llc2->llc_control == LLC_UI) {
3020 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3026 * If we're trying to filter bridge traffic, don't look at anything
3027 * other than IP and ARP traffic. If the filter doesn't understand
3028 * IPv6, don't allow IPv6 through the bridge either. This is lame
3029 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3030 * but of course we don't have an AppleTalk filter to begin with.
3031 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3034 switch (ether_type) {
3036 case ETHERTYPE_REVARP:
3037 if (pfil_ipfw_arp == 0)
3038 return (0); /* Automatically pass */
3043 case ETHERTYPE_IPV6:
3048 * Check to see if the user wants to pass non-ip
3049 * packets, these will not be checked by pfil(9) and
3050 * passed unconditionally so the default is to drop.
3056 /* Strip off the Ethernet header and keep a copy. */
3057 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3058 m_adj(*mp, ETHER_HDR_LEN);
3060 /* Strip off snap header, if present */
3062 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3063 m_adj(*mp, sizeof(struct llc));
3067 * Check the IP header for alignment and errors
3069 if (dir == PFIL_IN) {
3070 switch (ether_type) {
3072 error = bridge_ip_checkbasic(mp);
3075 case ETHERTYPE_IPV6:
3076 error = bridge_ip6_checkbasic(mp);
3086 /* XXX this section is also in if_ethersubr.c */
3087 // XXX PFIL_OUT or DIR_OUT ?
3088 if (V_ip_fw_chk_ptr && pfil_ipfw != 0 &&
3089 dir == PFIL_OUT && ifp != NULL) {
3093 /* fetch the start point from existing tags, if any */
3094 mtag = m_tag_locate(*mp, MTAG_IPFW_RULE, 0, NULL);
3098 struct ipfw_rule_ref *r;
3100 /* XXX can we free the tag after use ? */
3101 mtag->m_tag_id = PACKET_TAG_NONE;
3102 r = (struct ipfw_rule_ref *)(mtag + 1);
3103 /* packet already partially processed ? */
3104 if (r->info & IPFW_ONEPASS)
3111 args.next_hop = NULL;
3112 args.next_hop6 = NULL;
3114 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
3115 i = V_ip_fw_chk_ptr(&args);
3121 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) {
3123 /* put the Ethernet header back on */
3124 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3127 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3130 * Pass the pkt to dummynet, which consumes it. The
3131 * packet will return to us via bridge_dummynet().
3134 ip_dn_io_ptr(mp, DIR_FWD | PROTO_IFB, &args);
3138 if (i != IP_FW_PASS) /* drop */
3146 * Run the packet through pfil
3148 switch (ether_type) {
3151 * before calling the firewall, swap fields the same as
3152 * IP does. here we assume the header is contiguous
3154 ip = mtod(*mp, struct ip *);
3156 ip->ip_len = ntohs(ip->ip_len);
3157 ip->ip_off = ntohs(ip->ip_off);
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 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3189 i = (*mp)->m_pkthdr.len;
3190 if (i > ifp->if_mtu) {
3191 error = bridge_fragment(ifp, *mp, &eh2, snap,
3197 /* Recalculate the ip checksum and restore byte ordering */
3198 ip = mtod(*mp, struct ip *);
3199 hlen = ip->ip_hl << 2;
3200 if (hlen < sizeof(struct ip))
3202 if (hlen > (*mp)->m_len) {
3203 if ((*mp = m_pullup(*mp, hlen)) == 0)
3205 ip = mtod(*mp, struct ip *);
3209 ip->ip_len = htons(ip->ip_len);
3210 ip->ip_off = htons(ip->ip_off);
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_DONTWAIT);
3258 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3261 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
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 V_ip6stat.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 V_ip6stat.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 V_ip6stat.ip6s_badvers++;
3415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3419 /* Checks out, proceed */
3432 * Return a fragmented mbuf chain.
3435 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3436 int snap, struct llc *llc)
3442 if (m->m_len < sizeof(struct ip) &&
3443 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3445 ip = mtod(m, struct ip *);
3447 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
3452 /* walk the chain and re-add the Ethernet header */
3453 for (m0 = m; m0; m0 = m0->m_nextpkt) {
3456 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
3461 bcopy(llc, mtod(m0, caddr_t),
3462 sizeof(struct llc));
3464 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
3469 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3475 KMOD_IPSTAT_INC(ips_fragmented);
3486 bridge_linkstate(struct ifnet *ifp)
3488 struct bridge_softc *sc = ifp->if_bridge;
3489 struct bridge_iflist *bif;
3492 bif = bridge_lookup_member_if(sc, ifp);
3497 bridge_linkcheck(sc);
3500 bstp_linkstate(&bif->bif_stp);
3504 bridge_linkcheck(struct bridge_softc *sc)
3506 struct bridge_iflist *bif;
3507 int new_link, hasls;
3509 BRIDGE_LOCK_ASSERT(sc);
3510 new_link = LINK_STATE_DOWN;
3512 /* Our link is considered up if at least one of our ports is active */
3513 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3514 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3516 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3517 new_link = LINK_STATE_UP;
3521 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3522 /* If no interfaces support link-state then we default to up */
3523 new_link = LINK_STATE_UP;
3525 if_link_state_change(sc->sc_ifp, new_link);