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>
122 #include <netinet6/in6_ifattach.h>
124 #if defined(INET) || defined(INET6)
125 #include <netinet/ip_carp.h>
127 #include <machine/in_cksum.h>
128 #include <netinet/if_ether.h> /* for struct arpcom */
129 #include <net/bridgestp.h>
130 #include <net/if_bridgevar.h>
131 #include <net/if_llc.h>
132 #include <net/if_vlan_var.h>
134 #include <net/route.h>
135 #include <netinet/ip_fw.h>
136 #include <netpfil/ipfw/ip_fw_private.h>
139 * Size of the route hash table. Must be a power of two.
141 #ifndef BRIDGE_RTHASH_SIZE
142 #define BRIDGE_RTHASH_SIZE 1024
145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
148 * Default maximum number of addresses to cache.
150 #ifndef BRIDGE_RTABLE_MAX
151 #define BRIDGE_RTABLE_MAX 2000
155 * Timeout (in seconds) for entries learned dynamically.
157 #ifndef BRIDGE_RTABLE_TIMEOUT
158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
162 * Number of seconds between walks of the route list.
164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
169 * List of capabilities to possibly mask on the member interface.
171 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
174 * List of capabilities to strip
176 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO
179 * Bridge interface list entry.
181 struct bridge_iflist {
182 LIST_ENTRY(bridge_iflist) bif_next;
183 struct ifnet *bif_ifp; /* member if */
184 struct bstp_port bif_stp; /* STP state */
185 uint32_t bif_flags; /* member if flags */
186 int bif_savedcaps; /* saved capabilities */
187 uint32_t bif_addrmax; /* max # of addresses */
188 uint32_t bif_addrcnt; /* cur. # of addresses */
189 uint32_t bif_addrexceeded;/* # of address violations */
195 struct bridge_rtnode {
196 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
197 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
198 struct bridge_iflist *brt_dst; /* destination if */
199 unsigned long brt_expire; /* expiration time */
200 uint8_t brt_flags; /* address flags */
201 uint8_t brt_addr[ETHER_ADDR_LEN];
202 uint16_t brt_vlan; /* vlan id */
204 #define brt_ifp brt_dst->bif_ifp
207 * Software state for each bridge.
209 struct bridge_softc {
210 struct ifnet *sc_ifp; /* make this an interface */
211 LIST_ENTRY(bridge_softc) sc_list;
214 uint32_t sc_brtmax; /* max # of addresses */
215 uint32_t sc_brtcnt; /* cur. # of addresses */
216 uint32_t sc_brttimeout; /* rt timeout in seconds */
217 struct callout sc_brcallout; /* bridge callout */
218 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
219 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
220 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
221 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
222 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
223 uint32_t sc_rthash_key; /* key for hash */
224 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
225 struct bstp_state sc_stp; /* STP state */
226 uint32_t sc_brtexceeded; /* # of cache drops */
227 struct ifnet *sc_ifaddr; /* member mac copied from */
228 u_char sc_defaddr[6]; /* Default MAC address */
231 static struct mtx bridge_list_mtx;
232 eventhandler_tag bridge_detach_cookie = NULL;
234 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
236 uma_zone_t bridge_rtnode_zone;
238 static int bridge_clone_create(struct if_clone *, int, caddr_t);
239 static void bridge_clone_destroy(struct ifnet *);
241 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
242 static void bridge_mutecaps(struct bridge_softc *);
243 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
245 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
246 static void bridge_init(void *);
247 static void bridge_dummynet(struct mbuf *, struct ifnet *);
248 static void bridge_stop(struct ifnet *, int);
249 static void bridge_start(struct ifnet *);
250 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
251 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
253 static void bridge_enqueue(struct bridge_softc *, struct ifnet *,
255 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
257 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
260 static void bridge_timer(void *);
262 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
264 static void bridge_span(struct bridge_softc *, struct mbuf *);
266 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
267 uint16_t, struct bridge_iflist *, int, uint8_t);
268 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
270 static void bridge_rttrim(struct bridge_softc *);
271 static void bridge_rtage(struct bridge_softc *);
272 static void bridge_rtflush(struct bridge_softc *, int);
273 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
276 static int bridge_rtable_init(struct bridge_softc *);
277 static void bridge_rtable_fini(struct bridge_softc *);
279 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
280 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
281 const uint8_t *, uint16_t);
282 static int bridge_rtnode_insert(struct bridge_softc *,
283 struct bridge_rtnode *);
284 static void bridge_rtnode_destroy(struct bridge_softc *,
285 struct bridge_rtnode *);
286 static void bridge_rtable_expire(struct ifnet *, int);
287 static void bridge_state_change(struct ifnet *, int);
289 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
291 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
293 static void bridge_delete_member(struct bridge_softc *,
294 struct bridge_iflist *, int);
295 static void bridge_delete_span(struct bridge_softc *,
296 struct bridge_iflist *);
298 static int bridge_ioctl_add(struct bridge_softc *, void *);
299 static int bridge_ioctl_del(struct bridge_softc *, void *);
300 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
301 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
302 static int bridge_ioctl_scache(struct bridge_softc *, void *);
303 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
304 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
305 static int bridge_ioctl_rts(struct bridge_softc *, void *);
306 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
307 static int bridge_ioctl_sto(struct bridge_softc *, void *);
308 static int bridge_ioctl_gto(struct bridge_softc *, void *);
309 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
310 static int bridge_ioctl_flush(struct bridge_softc *, void *);
311 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
312 static int bridge_ioctl_spri(struct bridge_softc *, void *);
313 static int bridge_ioctl_ght(struct bridge_softc *, void *);
314 static int bridge_ioctl_sht(struct bridge_softc *, void *);
315 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
316 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
317 static int bridge_ioctl_gma(struct bridge_softc *, void *);
318 static int bridge_ioctl_sma(struct bridge_softc *, void *);
319 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
320 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
321 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
322 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
323 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
324 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
325 static int bridge_ioctl_grte(struct bridge_softc *, void *);
326 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
327 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
328 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
329 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
331 static int bridge_ip_checkbasic(struct mbuf **mp);
333 static int bridge_ip6_checkbasic(struct mbuf **mp);
335 static int bridge_fragment(struct ifnet *, struct mbuf *,
336 struct ether_header *, int, struct llc *);
337 static void bridge_linkstate(struct ifnet *ifp);
338 static void bridge_linkcheck(struct bridge_softc *sc);
340 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
342 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
343 #define VLANTAGOF(_m) \
344 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
346 static struct bstp_cb_ops bridge_ops = {
347 .bcb_state = bridge_state_change,
348 .bcb_rtage = bridge_rtable_expire
351 SYSCTL_DECL(_net_link);
352 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
354 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
355 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
356 static int pfil_member = 1; /* run pfil hooks on the member interface */
357 static int pfil_ipfw = 0; /* layer2 filter with ipfw */
358 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */
359 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
360 locally destined packets */
361 static int log_stp = 0; /* log STP state changes */
362 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */
363 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
364 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
365 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
366 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
367 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
368 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
369 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
370 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
371 &pfil_bridge, 0, "Packet filter on the bridge interface");
372 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
373 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
374 &pfil_member, 0, "Packet filter on the member interface");
375 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
376 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
378 "Packet filter on the physical interface for locally destined packets");
379 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
380 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
381 &log_stp, 0, "Log STP state changes");
382 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
383 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
384 &bridge_inherit_mac, 0,
385 "Inherit MAC address from the first bridge member");
387 static VNET_DEFINE(int, allow_llz_overlap) = 0;
388 #define V_allow_llz_overlap VNET(allow_llz_overlap)
389 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
390 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
391 "zones of a bridge interface and the member interfaces");
393 struct bridge_control {
394 int (*bc_func)(struct bridge_softc *, void *);
399 #define BC_F_COPYIN 0x01 /* copy arguments in */
400 #define BC_F_COPYOUT 0x02 /* copy arguments out */
401 #define BC_F_SUSER 0x04 /* do super-user check */
403 const struct bridge_control bridge_control_table[] = {
404 { bridge_ioctl_add, sizeof(struct ifbreq),
405 BC_F_COPYIN|BC_F_SUSER },
406 { bridge_ioctl_del, sizeof(struct ifbreq),
407 BC_F_COPYIN|BC_F_SUSER },
409 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
410 BC_F_COPYIN|BC_F_COPYOUT },
411 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
412 BC_F_COPYIN|BC_F_SUSER },
414 { bridge_ioctl_scache, sizeof(struct ifbrparam),
415 BC_F_COPYIN|BC_F_SUSER },
416 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
419 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
420 BC_F_COPYIN|BC_F_COPYOUT },
421 { bridge_ioctl_rts, sizeof(struct ifbaconf),
422 BC_F_COPYIN|BC_F_COPYOUT },
424 { bridge_ioctl_saddr, sizeof(struct ifbareq),
425 BC_F_COPYIN|BC_F_SUSER },
427 { bridge_ioctl_sto, sizeof(struct ifbrparam),
428 BC_F_COPYIN|BC_F_SUSER },
429 { bridge_ioctl_gto, sizeof(struct ifbrparam),
432 { bridge_ioctl_daddr, sizeof(struct ifbareq),
433 BC_F_COPYIN|BC_F_SUSER },
435 { bridge_ioctl_flush, sizeof(struct ifbreq),
436 BC_F_COPYIN|BC_F_SUSER },
438 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
440 { bridge_ioctl_spri, sizeof(struct ifbrparam),
441 BC_F_COPYIN|BC_F_SUSER },
443 { bridge_ioctl_ght, sizeof(struct ifbrparam),
445 { bridge_ioctl_sht, sizeof(struct ifbrparam),
446 BC_F_COPYIN|BC_F_SUSER },
448 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
450 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
451 BC_F_COPYIN|BC_F_SUSER },
453 { bridge_ioctl_gma, sizeof(struct ifbrparam),
455 { bridge_ioctl_sma, sizeof(struct ifbrparam),
456 BC_F_COPYIN|BC_F_SUSER },
458 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
459 BC_F_COPYIN|BC_F_SUSER },
461 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
462 BC_F_COPYIN|BC_F_SUSER },
464 { bridge_ioctl_addspan, sizeof(struct ifbreq),
465 BC_F_COPYIN|BC_F_SUSER },
466 { bridge_ioctl_delspan, sizeof(struct ifbreq),
467 BC_F_COPYIN|BC_F_SUSER },
469 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
472 { bridge_ioctl_grte, sizeof(struct ifbrparam),
475 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
476 BC_F_COPYIN|BC_F_COPYOUT },
478 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
479 BC_F_COPYIN|BC_F_SUSER },
481 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
482 BC_F_COPYIN|BC_F_SUSER },
484 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
485 BC_F_COPYIN|BC_F_SUSER },
488 const int bridge_control_table_size =
489 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
491 LIST_HEAD(, bridge_softc) bridge_list;
493 IFC_SIMPLE_DECLARE(bridge, 0);
496 bridge_modevent(module_t mod, int type, void *data)
501 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
502 if_clone_attach(&bridge_cloner);
503 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
504 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
506 LIST_INIT(&bridge_list);
507 bridge_input_p = bridge_input;
508 bridge_output_p = bridge_output;
509 bridge_dn_p = bridge_dummynet;
510 bridge_linkstate_p = bridge_linkstate;
511 bridge_detach_cookie = EVENTHANDLER_REGISTER(
512 ifnet_departure_event, bridge_ifdetach, NULL,
513 EVENTHANDLER_PRI_ANY);
516 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
517 bridge_detach_cookie);
518 if_clone_detach(&bridge_cloner);
519 uma_zdestroy(bridge_rtnode_zone);
520 bridge_input_p = NULL;
521 bridge_output_p = NULL;
523 bridge_linkstate_p = NULL;
524 mtx_destroy(&bridge_list_mtx);
532 static moduledata_t bridge_mod = {
538 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
539 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
542 * handler for net.link.bridge.pfil_ipfw
545 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
547 int enable = pfil_ipfw;
550 error = sysctl_handle_int(oidp, &enable, 0, req);
551 enable = (enable) ? 1 : 0;
553 if (enable != pfil_ipfw) {
557 * Disable pfil so that ipfw doesnt run twice, if the user
558 * really wants both then they can re-enable pfil_bridge and/or
559 * pfil_member. Also allow non-ip packets as ipfw can filter by
571 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
572 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
575 * bridge_clone_create:
577 * Create a new bridge instance.
580 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
582 struct bridge_softc *sc, *sc2;
583 struct ifnet *bifp, *ifp;
585 unsigned long hostid;
587 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
588 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
594 BRIDGE_LOCK_INIT(sc);
595 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
596 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
598 /* Initialize our routing table. */
599 bridge_rtable_init(sc);
601 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
603 LIST_INIT(&sc->sc_iflist);
604 LIST_INIT(&sc->sc_spanlist);
607 if_initname(ifp, ifc->ifc_name, unit);
608 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
609 ifp->if_ioctl = bridge_ioctl;
610 ifp->if_start = bridge_start;
611 ifp->if_init = bridge_init;
612 ifp->if_type = IFT_BRIDGE;
613 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
614 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
615 IFQ_SET_READY(&ifp->if_snd);
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);
627 for (retry = 1; retry != 0;) {
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)
650 mtx_unlock(&bridge_list_mtx);
653 bstp_attach(&sc->sc_stp, &bridge_ops);
654 ether_ifattach(ifp, sc->sc_defaddr);
655 /* Now undo some of the damage... */
656 ifp->if_baudrate = 0;
657 ifp->if_type = IFT_BRIDGE;
659 mtx_lock(&bridge_list_mtx);
660 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
661 mtx_unlock(&bridge_list_mtx);
667 * bridge_clone_destroy:
669 * Destroy a bridge instance.
672 bridge_clone_destroy(struct ifnet *ifp)
674 struct bridge_softc *sc = ifp->if_softc;
675 struct bridge_iflist *bif;
680 ifp->if_flags &= ~IFF_UP;
682 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
683 bridge_delete_member(sc, bif, 0);
685 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
686 bridge_delete_span(sc, bif);
691 callout_drain(&sc->sc_brcallout);
693 mtx_lock(&bridge_list_mtx);
694 LIST_REMOVE(sc, sc_list);
695 mtx_unlock(&bridge_list_mtx);
697 bstp_detach(&sc->sc_stp);
699 if_free_type(ifp, IFT_ETHER);
701 /* Tear down the routing table. */
702 bridge_rtable_fini(sc);
704 BRIDGE_LOCK_DESTROY(sc);
711 * Handle a control request from the operator.
714 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
716 struct bridge_softc *sc = ifp->if_softc;
717 struct ifreq *ifr = (struct ifreq *)data;
718 struct bridge_iflist *bif;
719 struct thread *td = curthread;
721 struct ifbreq ifbreq;
722 struct ifbifconf ifbifconf;
723 struct ifbareq ifbareq;
724 struct ifbaconf ifbaconf;
725 struct ifbrparam ifbrparam;
726 struct ifbropreq ifbropreq;
728 struct ifdrv *ifd = (struct ifdrv *) data;
729 const struct bridge_control *bc;
740 if (ifd->ifd_cmd >= bridge_control_table_size) {
744 bc = &bridge_control_table[ifd->ifd_cmd];
746 if (cmd == SIOCGDRVSPEC &&
747 (bc->bc_flags & BC_F_COPYOUT) == 0) {
751 else if (cmd == SIOCSDRVSPEC &&
752 (bc->bc_flags & BC_F_COPYOUT) != 0) {
757 if (bc->bc_flags & BC_F_SUSER) {
758 error = priv_check(td, PRIV_NET_BRIDGE);
763 if (ifd->ifd_len != bc->bc_argsize ||
764 ifd->ifd_len > sizeof(args)) {
769 bzero(&args, sizeof(args));
770 if (bc->bc_flags & BC_F_COPYIN) {
771 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
777 error = (*bc->bc_func)(sc, &args);
782 if (bc->bc_flags & BC_F_COPYOUT)
783 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
788 if (!(ifp->if_flags & IFF_UP) &&
789 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
791 * If interface is marked down and it is running,
792 * then stop and disable it.
797 } else if ((ifp->if_flags & IFF_UP) &&
798 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
800 * If interface is marked up and it is stopped, then
808 if (ifr->ifr_mtu < 576) {
812 if (LIST_EMPTY(&sc->sc_iflist)) {
813 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
817 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
818 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
819 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
820 " != %d\n", sc->sc_ifp->if_xname,
821 bif->bif_ifp->if_mtu,
822 bif->bif_ifp->if_xname, ifr->ifr_mtu);
828 sc->sc_ifp->if_mtu = ifr->ifr_mtu;
833 * drop the lock as ether_ioctl() will call bridge_start() and
834 * cause the lock to be recursed.
836 error = ether_ioctl(ifp, cmd, data);
846 * Clear or restore unwanted capabilities on the member interface
849 bridge_mutecaps(struct bridge_softc *sc)
851 struct bridge_iflist *bif;
854 /* Initial bitmask of capabilities to test */
855 mask = BRIDGE_IFCAPS_MASK;
857 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
858 /* Every member must support it or its disabled */
859 mask &= bif->bif_savedcaps;
862 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
863 enabled = bif->bif_ifp->if_capenable;
864 enabled &= ~BRIDGE_IFCAPS_STRIP;
865 /* strip off mask bits and enable them again if allowed */
866 enabled &= ~BRIDGE_IFCAPS_MASK;
868 bridge_set_ifcap(sc, bif, enabled);
874 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
876 struct ifnet *ifp = bif->bif_ifp;
880 bzero(&ifr, sizeof(ifr));
881 ifr.ifr_reqcap = set;
883 if (ifp->if_capenable != set) {
884 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
886 if_printf(sc->sc_ifp,
887 "error setting interface capabilities on %s\n",
893 * bridge_lookup_member:
895 * Lookup a bridge member interface.
897 static struct bridge_iflist *
898 bridge_lookup_member(struct bridge_softc *sc, const char *name)
900 struct bridge_iflist *bif;
903 BRIDGE_LOCK_ASSERT(sc);
905 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
907 if (strcmp(ifp->if_xname, name) == 0)
915 * bridge_lookup_member_if:
917 * Lookup a bridge member interface by ifnet*.
919 static struct bridge_iflist *
920 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
922 struct bridge_iflist *bif;
924 BRIDGE_LOCK_ASSERT(sc);
926 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
927 if (bif->bif_ifp == member_ifp)
935 * bridge_delete_member:
937 * Delete the specified member interface.
940 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
943 struct ifnet *ifs = bif->bif_ifp;
944 struct ifnet *fif = NULL;
946 BRIDGE_LOCK_ASSERT(sc);
948 if (bif->bif_flags & IFBIF_STP)
949 bstp_disable(&bif->bif_stp);
951 ifs->if_bridge = NULL;
953 LIST_REMOVE(bif, bif_next);
957 * If removing the interface that gave the bridge its mac address, set
958 * the mac address of the bridge to the address of the next member, or
959 * to its default address if no members are left.
961 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
962 if (LIST_EMPTY(&sc->sc_iflist)) {
963 bcopy(sc->sc_defaddr,
964 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
965 sc->sc_ifaddr = NULL;
967 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
968 bcopy(IF_LLADDR(fif),
969 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
972 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
975 bridge_linkcheck(sc);
976 bridge_mutecaps(sc); /* recalcuate now this interface is removed */
977 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
978 KASSERT(bif->bif_addrcnt == 0,
979 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
983 switch (ifs->if_type) {
987 * Take the interface out of promiscuous mode.
989 (void) ifpromisc(ifs, 0);
997 panic("bridge_delete_member: impossible");
1001 /* reneable any interface capabilities */
1002 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1004 bstp_destroy(&bif->bif_stp); /* prepare to free */
1006 free(bif, M_DEVBUF);
1010 * bridge_delete_span:
1012 * Delete the specified span interface.
1015 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1017 BRIDGE_LOCK_ASSERT(sc);
1019 KASSERT(bif->bif_ifp->if_bridge == NULL,
1020 ("%s: not a span interface", __func__));
1022 LIST_REMOVE(bif, bif_next);
1023 free(bif, M_DEVBUF);
1027 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1029 struct ifbreq *req = arg;
1030 struct bridge_iflist *bif = NULL;
1034 ifs = ifunit(req->ifbr_ifsname);
1037 if (ifs->if_ioctl == NULL) /* must be supported */
1040 /* If it's in the span list, it can't be a member. */
1041 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1042 if (ifs == bif->bif_ifp)
1045 if (ifs->if_bridge == sc)
1048 if (ifs->if_bridge != NULL)
1051 switch (ifs->if_type) {
1055 /* permitted interface types */
1063 * Two valid inet6 addresses with link-local scope must not be
1064 * on the parent interface and the member interfaces at the
1065 * same time. This restriction is needed to prevent violation
1066 * of link-local scope zone. Attempts to add a member
1067 * interface which has inet6 addresses when the parent has
1068 * inet6 triggers removal of all inet6 addresses on the member
1072 /* Check if the parent interface has a link-local scope addr. */
1073 if (V_allow_llz_overlap == 0 &&
1074 in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1076 * If any, remove all inet6 addresses from the member
1080 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1081 if (in6ifa_llaonifp(bif->bif_ifp)) {
1083 in6_ifdetach(bif->bif_ifp);
1085 if_printf(sc->sc_ifp,
1086 "IPv6 addresses on %s have been removed "
1087 "before adding it as a member to prevent "
1088 "IPv6 address scope violation.\n",
1089 bif->bif_ifp->if_xname);
1093 if (in6ifa_llaonifp(ifs)) {
1097 if_printf(sc->sc_ifp,
1098 "IPv6 addresses on %s have been removed "
1099 "before adding it as a member to prevent "
1100 "IPv6 address scope violation.\n",
1105 /* Allow the first Ethernet member to define the MTU */
1106 if (LIST_EMPTY(&sc->sc_iflist))
1107 sc->sc_ifp->if_mtu = ifs->if_mtu;
1108 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1109 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1110 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1114 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1119 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1120 bif->bif_savedcaps = ifs->if_capenable;
1123 * Assign the interface's MAC address to the bridge if it's the first
1124 * member and the MAC address of the bridge has not been changed from
1125 * the default randomly generated one.
1127 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1128 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1129 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1130 sc->sc_ifaddr = ifs;
1131 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1134 ifs->if_bridge = sc;
1135 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1137 * XXX: XLOCK HERE!?!
1139 * NOTE: insert_***HEAD*** should be safe for the traversals.
1141 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1143 /* Set interface capabilities to the intersection set of all members */
1144 bridge_mutecaps(sc);
1145 bridge_linkcheck(sc);
1147 /* Place the interface into promiscuous mode */
1148 switch (ifs->if_type) {
1152 error = ifpromisc(ifs, 1);
1158 bridge_delete_member(sc, bif, 0);
1159 free(bif, M_DEVBUF);
1165 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1167 struct ifbreq *req = arg;
1168 struct bridge_iflist *bif;
1170 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1174 bridge_delete_member(sc, bif, 0);
1180 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1182 struct ifbreq *req = arg;
1183 struct bridge_iflist *bif;
1184 struct bstp_port *bp;
1186 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1191 req->ifbr_ifsflags = bif->bif_flags;
1192 req->ifbr_state = bp->bp_state;
1193 req->ifbr_priority = bp->bp_priority;
1194 req->ifbr_path_cost = bp->bp_path_cost;
1195 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1196 req->ifbr_proto = bp->bp_protover;
1197 req->ifbr_role = bp->bp_role;
1198 req->ifbr_stpflags = bp->bp_flags;
1199 req->ifbr_addrcnt = bif->bif_addrcnt;
1200 req->ifbr_addrmax = bif->bif_addrmax;
1201 req->ifbr_addrexceeded = bif->bif_addrexceeded;
1203 /* Copy STP state options as flags */
1204 if (bp->bp_operedge)
1205 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1206 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1207 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1208 if (bp->bp_ptp_link)
1209 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1210 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1211 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1212 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1213 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1214 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1215 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1220 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1222 struct ifbreq *req = arg;
1223 struct bridge_iflist *bif;
1224 struct bstp_port *bp;
1227 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1232 if (req->ifbr_ifsflags & IFBIF_SPAN)
1233 /* SPAN is readonly */
1236 if (req->ifbr_ifsflags & IFBIF_STP) {
1237 if ((bif->bif_flags & IFBIF_STP) == 0) {
1238 error = bstp_enable(&bif->bif_stp);
1243 if ((bif->bif_flags & IFBIF_STP) != 0)
1244 bstp_disable(&bif->bif_stp);
1247 /* Pass on STP flags */
1248 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1249 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1250 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1251 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1253 /* Save the bits relating to the bridge */
1254 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1260 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1262 struct ifbrparam *param = arg;
1264 sc->sc_brtmax = param->ifbrp_csize;
1271 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1273 struct ifbrparam *param = arg;
1275 param->ifbrp_csize = sc->sc_brtmax;
1281 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1283 struct ifbifconf *bifc = arg;
1284 struct bridge_iflist *bif;
1287 int count, buflen, len, error = 0;
1290 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1292 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1295 buflen = sizeof(breq) * count;
1296 if (bifc->ifbic_len == 0) {
1297 bifc->ifbic_len = buflen;
1301 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1306 len = min(bifc->ifbic_len, buflen);
1307 bzero(&breq, sizeof(breq));
1308 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1309 if (len < sizeof(breq))
1312 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1313 sizeof(breq.ifbr_ifsname));
1314 /* Fill in the ifbreq structure */
1315 error = bridge_ioctl_gifflags(sc, &breq);
1318 memcpy(buf, &breq, sizeof(breq));
1320 buf += sizeof(breq);
1321 len -= sizeof(breq);
1323 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1324 if (len < sizeof(breq))
1327 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1328 sizeof(breq.ifbr_ifsname));
1329 breq.ifbr_ifsflags = bif->bif_flags;
1330 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1331 memcpy(buf, &breq, sizeof(breq));
1333 buf += sizeof(breq);
1334 len -= sizeof(breq);
1338 bifc->ifbic_len = sizeof(breq) * count;
1339 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1341 free(outbuf, M_TEMP);
1346 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1348 struct ifbaconf *bac = arg;
1349 struct bridge_rtnode *brt;
1350 struct ifbareq bareq;
1352 int count, buflen, len, error = 0;
1354 if (bac->ifbac_len == 0)
1358 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1360 buflen = sizeof(bareq) * count;
1363 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1368 len = min(bac->ifbac_len, buflen);
1369 bzero(&bareq, sizeof(bareq));
1370 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1371 if (len < sizeof(bareq))
1373 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1374 sizeof(bareq.ifba_ifsname));
1375 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1376 bareq.ifba_vlan = brt->brt_vlan;
1377 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1378 time_uptime < brt->brt_expire)
1379 bareq.ifba_expire = brt->brt_expire - time_uptime;
1381 bareq.ifba_expire = 0;
1382 bareq.ifba_flags = brt->brt_flags;
1384 memcpy(buf, &bareq, sizeof(bareq));
1386 buf += sizeof(bareq);
1387 len -= sizeof(bareq);
1391 bac->ifbac_len = sizeof(bareq) * count;
1392 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1394 free(outbuf, M_TEMP);
1399 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1401 struct ifbareq *req = arg;
1402 struct bridge_iflist *bif;
1405 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1409 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1416 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1418 struct ifbrparam *param = arg;
1420 sc->sc_brttimeout = param->ifbrp_ctime;
1425 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1427 struct ifbrparam *param = arg;
1429 param->ifbrp_ctime = sc->sc_brttimeout;
1434 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1436 struct ifbareq *req = arg;
1438 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1442 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1444 struct ifbreq *req = arg;
1446 bridge_rtflush(sc, req->ifbr_ifsflags);
1451 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1453 struct ifbrparam *param = arg;
1454 struct bstp_state *bs = &sc->sc_stp;
1456 param->ifbrp_prio = bs->bs_bridge_priority;
1461 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1463 struct ifbrparam *param = arg;
1465 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1469 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1471 struct ifbrparam *param = arg;
1472 struct bstp_state *bs = &sc->sc_stp;
1474 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1479 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1481 struct ifbrparam *param = arg;
1483 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1487 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1489 struct ifbrparam *param = arg;
1490 struct bstp_state *bs = &sc->sc_stp;
1492 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1497 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1499 struct ifbrparam *param = arg;
1501 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1505 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1507 struct ifbrparam *param = arg;
1508 struct bstp_state *bs = &sc->sc_stp;
1510 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1515 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1517 struct ifbrparam *param = arg;
1519 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1523 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1525 struct ifbreq *req = arg;
1526 struct bridge_iflist *bif;
1528 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1532 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1536 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1538 struct ifbreq *req = arg;
1539 struct bridge_iflist *bif;
1541 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1545 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1549 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1551 struct ifbreq *req = arg;
1552 struct bridge_iflist *bif;
1554 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1558 bif->bif_addrmax = req->ifbr_addrmax;
1563 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1565 struct ifbreq *req = arg;
1566 struct bridge_iflist *bif = NULL;
1569 ifs = ifunit(req->ifbr_ifsname);
1573 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1574 if (ifs == bif->bif_ifp)
1577 if (ifs->if_bridge != NULL)
1580 switch (ifs->if_type) {
1589 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1594 bif->bif_flags = IFBIF_SPAN;
1596 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1602 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1604 struct ifbreq *req = arg;
1605 struct bridge_iflist *bif;
1608 ifs = ifunit(req->ifbr_ifsname);
1612 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1613 if (ifs == bif->bif_ifp)
1619 bridge_delete_span(sc, bif);
1625 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1627 struct ifbropreq *req = arg;
1628 struct bstp_state *bs = &sc->sc_stp;
1629 struct bstp_port *root_port;
1631 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1632 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1633 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1635 root_port = bs->bs_root_port;
1636 if (root_port == NULL)
1637 req->ifbop_root_port = 0;
1639 req->ifbop_root_port = root_port->bp_ifp->if_index;
1641 req->ifbop_holdcount = bs->bs_txholdcount;
1642 req->ifbop_priority = bs->bs_bridge_priority;
1643 req->ifbop_protocol = bs->bs_protover;
1644 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1645 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1646 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1647 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1648 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1649 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1655 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1657 struct ifbrparam *param = arg;
1659 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1664 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1666 struct ifbpstpconf *bifstp = arg;
1667 struct bridge_iflist *bif;
1668 struct bstp_port *bp;
1669 struct ifbpstpreq bpreq;
1671 int count, buflen, len, error = 0;
1674 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1675 if ((bif->bif_flags & IFBIF_STP) != 0)
1679 buflen = sizeof(bpreq) * count;
1680 if (bifstp->ifbpstp_len == 0) {
1681 bifstp->ifbpstp_len = buflen;
1686 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1691 len = min(bifstp->ifbpstp_len, buflen);
1692 bzero(&bpreq, sizeof(bpreq));
1693 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1694 if (len < sizeof(bpreq))
1697 if ((bif->bif_flags & IFBIF_STP) == 0)
1701 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1702 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1703 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1704 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1705 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1706 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1708 memcpy(buf, &bpreq, sizeof(bpreq));
1710 buf += sizeof(bpreq);
1711 len -= sizeof(bpreq);
1715 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1716 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1718 free(outbuf, M_TEMP);
1723 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1725 struct ifbrparam *param = arg;
1727 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1731 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1733 struct ifbrparam *param = arg;
1735 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1741 * Detach an interface from a bridge. Called when a member
1742 * interface is detaching.
1745 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1747 struct bridge_softc *sc = ifp->if_bridge;
1748 struct bridge_iflist *bif;
1750 if (ifp->if_flags & IFF_RENAMING)
1753 /* Check if the interface is a bridge member */
1757 bif = bridge_lookup_member_if(sc, ifp);
1759 bridge_delete_member(sc, bif, 1);
1765 /* Check if the interface is a span port */
1766 mtx_lock(&bridge_list_mtx);
1767 LIST_FOREACH(sc, &bridge_list, sc_list) {
1769 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1770 if (ifp == bif->bif_ifp) {
1771 bridge_delete_span(sc, bif);
1777 mtx_unlock(&bridge_list_mtx);
1783 * Initialize a bridge interface.
1786 bridge_init(void *xsc)
1788 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1789 struct ifnet *ifp = sc->sc_ifp;
1791 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1795 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1798 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1799 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1807 * Stop the bridge interface.
1810 bridge_stop(struct ifnet *ifp, int disable)
1812 struct bridge_softc *sc = ifp->if_softc;
1814 BRIDGE_LOCK_ASSERT(sc);
1816 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1819 callout_stop(&sc->sc_brcallout);
1820 bstp_stop(&sc->sc_stp);
1822 bridge_rtflush(sc, IFBF_FLUSHDYN);
1824 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1830 * Enqueue a packet on a bridge member interface.
1834 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1840 len = m->m_pkthdr.len;
1841 mflags = m->m_flags;
1843 /* We may be sending a fragment so traverse the mbuf */
1846 m->m_nextpkt = NULL;
1849 * If underlying interface can not do VLAN tag insertion itself
1850 * then attach a packet tag that holds it.
1852 if ((m->m_flags & M_VLANTAG) &&
1853 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1854 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1857 "unable to prepend VLAN header\n");
1858 dst_ifp->if_oerrors++;
1861 m->m_flags &= ~M_VLANTAG;
1864 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1871 sc->sc_ifp->if_opackets++;
1872 sc->sc_ifp->if_obytes += len;
1873 if (mflags & M_MCAST)
1874 sc->sc_ifp->if_omcasts++;
1881 * Receive a queued packet from dummynet and pass it on to the output
1884 * The mbuf has the Ethernet header already attached.
1887 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1889 struct bridge_softc *sc;
1891 sc = ifp->if_bridge;
1894 * The packet didnt originate from a member interface. This should only
1895 * ever happen if a member interface is removed while packets are
1903 if (PFIL_HOOKED(&V_inet_pfil_hook)
1905 || PFIL_HOOKED(&V_inet6_pfil_hook)
1908 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1914 bridge_enqueue(sc, ifp, m);
1920 * Send output from a bridge member interface. This
1921 * performs the bridging function for locally originated
1924 * The mbuf has the Ethernet header already attached. We must
1925 * enqueue or free the mbuf before returning.
1928 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1931 struct ether_header *eh;
1932 struct ifnet *dst_if;
1933 struct bridge_softc *sc;
1936 if (m->m_len < ETHER_HDR_LEN) {
1937 m = m_pullup(m, ETHER_HDR_LEN);
1942 eh = mtod(m, struct ether_header *);
1943 sc = ifp->if_bridge;
1944 vlan = VLANTAGOF(m);
1949 * If bridge is down, but the original output interface is up,
1950 * go ahead and send out that interface. Otherwise, the packet
1953 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1959 * If the packet is a multicast, or we don't know a better way to
1960 * get there, send to all interfaces.
1962 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1965 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1966 if (dst_if == NULL) {
1967 struct bridge_iflist *bif;
1969 int error = 0, used = 0;
1973 BRIDGE_LOCK2REF(sc, error);
1979 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1980 dst_if = bif->bif_ifp;
1982 if (dst_if->if_type == IFT_GIF)
1984 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1988 * If this is not the original output interface,
1989 * and the interface is participating in spanning
1990 * tree, make sure the port is in a state that
1991 * allows forwarding.
1993 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1994 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1997 if (LIST_NEXT(bif, bif_next) == NULL) {
2001 mc = m_copypacket(m, M_DONTWAIT);
2003 sc->sc_ifp->if_oerrors++;
2008 bridge_enqueue(sc, dst_if, mc);
2018 * XXX Spanning tree consideration here?
2022 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2029 bridge_enqueue(sc, dst_if, m);
2036 * Start output on a bridge.
2040 bridge_start(struct ifnet *ifp)
2042 struct bridge_softc *sc;
2044 struct ether_header *eh;
2045 struct ifnet *dst_if;
2049 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
2051 IFQ_DEQUEUE(&ifp->if_snd, m);
2054 ETHER_BPF_MTAP(ifp, m);
2056 eh = mtod(m, struct ether_header *);
2060 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2061 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1);
2065 bridge_broadcast(sc, ifp, m, 0);
2068 bridge_enqueue(sc, dst_if, m);
2071 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
2077 * The forwarding function of the bridge.
2079 * NOTE: Releases the lock on return.
2082 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2085 struct bridge_iflist *dbif;
2086 struct ifnet *src_if, *dst_if, *ifp;
2087 struct ether_header *eh;
2092 src_if = m->m_pkthdr.rcvif;
2096 ifp->if_ibytes += m->m_pkthdr.len;
2097 vlan = VLANTAGOF(m);
2099 if ((sbif->bif_flags & IFBIF_STP) &&
2100 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2103 eh = mtod(m, struct ether_header *);
2104 dst = eh->ether_dhost;
2106 /* If the interface is learning, record the address. */
2107 if (sbif->bif_flags & IFBIF_LEARNING) {
2108 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2109 sbif, 0, IFBAF_DYNAMIC);
2111 * If the interface has addresses limits then deny any source
2112 * that is not in the cache.
2114 if (error && sbif->bif_addrmax)
2118 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2119 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2123 * At this point, the port either doesn't participate
2124 * in spanning tree or it is in the forwarding state.
2128 * If the packet is unicast, destined for someone on
2129 * "this" side of the bridge, drop it.
2131 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2132 dst_if = bridge_rtlookup(sc, dst, vlan);
2133 if (src_if == dst_if)
2137 * Check if its a reserved multicast address, any address
2138 * listed in 802.1D section 7.12.6 may not be forwarded by the
2140 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2142 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2143 dst[2] == 0xc2 && dst[3] == 0x00 &&
2144 dst[4] == 0x00 && dst[5] <= 0x0f)
2147 /* ...forward it to all interfaces. */
2153 * If we have a destination interface which is a member of our bridge,
2154 * OR this is a unicast packet, push it through the bpf(4) machinery.
2155 * For broadcast or multicast packets, don't bother because it will
2156 * be reinjected into ether_input. We do this before we pass the packets
2157 * through the pfil(9) framework, as it is possible that pfil(9) will
2158 * drop the packet, or possibly modify it, making it difficult to debug
2159 * firewall issues on the bridge.
2161 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2162 ETHER_BPF_MTAP(ifp, m);
2164 /* run the packet filter */
2165 if (PFIL_HOOKED(&V_inet_pfil_hook)
2167 || PFIL_HOOKED(&V_inet6_pfil_hook)
2171 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2178 if (dst_if == NULL) {
2179 bridge_broadcast(sc, src_if, m, 1);
2184 * At this point, we're dealing with a unicast frame
2185 * going to a different interface.
2187 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2190 dbif = bridge_lookup_member_if(sc, dst_if);
2192 /* Not a member of the bridge (anymore?) */
2195 /* Private segments can not talk to each other */
2196 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2199 if ((dbif->bif_flags & IFBIF_STP) &&
2200 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2205 if (PFIL_HOOKED(&V_inet_pfil_hook)
2207 || PFIL_HOOKED(&V_inet6_pfil_hook)
2210 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2216 bridge_enqueue(sc, dst_if, m);
2227 * Receive input from a member interface. Queue the packet for
2228 * bridging if it is not for us.
2230 static struct mbuf *
2231 bridge_input(struct ifnet *ifp, struct mbuf *m)
2233 struct bridge_softc *sc = ifp->if_bridge;
2234 struct bridge_iflist *bif, *bif2;
2236 struct ether_header *eh;
2237 struct mbuf *mc, *mc2;
2241 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2245 vlan = VLANTAGOF(m);
2248 * Implement support for bridge monitoring. If this flag has been
2249 * set on this interface, discard the packet once we push it through
2250 * the bpf(4) machinery, but before we do, increment the byte and
2251 * packet counters associated with this interface.
2253 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2254 m->m_pkthdr.rcvif = bifp;
2255 ETHER_BPF_MTAP(bifp, m);
2256 bifp->if_ipackets++;
2257 bifp->if_ibytes += m->m_pkthdr.len;
2262 bif = bridge_lookup_member_if(sc, ifp);
2268 eh = mtod(m, struct ether_header *);
2272 if (m->m_flags & (M_BCAST|M_MCAST)) {
2273 /* Tap off 802.1D packets; they do not get forwarded. */
2274 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2275 ETHER_ADDR_LEN) == 0) {
2276 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2281 if ((bif->bif_flags & IFBIF_STP) &&
2282 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2288 * Make a deep copy of the packet and enqueue the copy
2289 * for bridge processing; return the original packet for
2292 mc = m_dup(m, M_DONTWAIT);
2298 /* Perform the bridge forwarding function with the copy. */
2299 bridge_forward(sc, bif, mc);
2302 * Reinject the mbuf as arriving on the bridge so we have a
2303 * chance at claiming multicast packets. We can not loop back
2304 * here from ether_input as a bridge is never a member of a
2307 KASSERT(bifp->if_bridge == NULL,
2308 ("loop created in bridge_input"));
2309 mc2 = m_dup(m, M_DONTWAIT);
2311 /* Keep the layer3 header aligned */
2312 int i = min(mc2->m_pkthdr.len, max_protohdr);
2313 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2316 mc2->m_pkthdr.rcvif = bifp;
2317 (*bifp->if_input)(bifp, mc2);
2320 /* Return the original packet for local processing. */
2324 if ((bif->bif_flags & IFBIF_STP) &&
2325 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2330 #if (defined(INET) || defined(INET6))
2331 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2332 || ((iface)->if_carp \
2333 && (*carp_forus_p)((iface), eh->ether_dhost))
2334 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2335 || ((iface)->if_carp \
2336 && (*carp_forus_p)((iface), eh->ether_shost))
2338 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2339 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2343 # define OR_PFIL_HOOKED_INET6 \
2344 || PFIL_HOOKED(&V_inet6_pfil_hook)
2346 # define OR_PFIL_HOOKED_INET6
2349 #define GRAB_OUR_PACKETS(iface) \
2350 if ((iface)->if_type == IFT_GIF) \
2352 /* It is destined for us. */ \
2353 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2354 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2356 if ((iface)->if_type == IFT_BRIDGE) { \
2357 ETHER_BPF_MTAP(iface, m); \
2358 iface->if_ipackets++; \
2359 /* Filter on the physical interface. */ \
2360 if (pfil_local_phys && \
2361 (PFIL_HOOKED(&V_inet_pfil_hook) \
2362 OR_PFIL_HOOKED_INET6)) { \
2363 if (bridge_pfil(&m, NULL, ifp, \
2364 PFIL_IN) != 0 || m == NULL) { \
2365 BRIDGE_UNLOCK(sc); \
2368 eh = mtod(m, struct ether_header *); \
2371 if (bif->bif_flags & IFBIF_LEARNING) { \
2372 error = bridge_rtupdate(sc, eh->ether_shost, \
2373 vlan, bif, 0, IFBAF_DYNAMIC); \
2374 if (error && bif->bif_addrmax) { \
2375 BRIDGE_UNLOCK(sc); \
2380 m->m_pkthdr.rcvif = iface; \
2381 BRIDGE_UNLOCK(sc); \
2385 /* We just received a packet that we sent out. */ \
2386 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2387 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2389 BRIDGE_UNLOCK(sc); \
2395 * Unicast. Make sure it's not for the bridge.
2397 do { GRAB_OUR_PACKETS(bifp) } while (0);
2400 * Give a chance for ifp at first priority. This will help when the
2401 * packet comes through the interface like VLAN's with the same MACs
2402 * on several interfaces from the same bridge. This also will save
2403 * some CPU cycles in case the destination interface and the input
2404 * interface (eq ifp) are the same.
2406 do { GRAB_OUR_PACKETS(ifp) } while (0);
2408 /* Now check the all bridge members. */
2409 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2410 GRAB_OUR_PACKETS(bif2->bif_ifp)
2413 #undef OR_CARP_CHECK_WE_ARE_DST
2414 #undef OR_CARP_CHECK_WE_ARE_SRC
2415 #undef OR_PFIL_HOOKED_INET6
2416 #undef GRAB_OUR_PACKETS
2418 /* Perform the bridge forwarding function. */
2419 bridge_forward(sc, bif, m);
2427 * Send a frame to all interfaces that are members of
2428 * the bridge, except for the one on which the packet
2431 * NOTE: Releases the lock on return.
2434 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2435 struct mbuf *m, int runfilt)
2437 struct bridge_iflist *dbif, *sbif;
2439 struct ifnet *dst_if;
2440 int error = 0, used = 0, i;
2442 sbif = bridge_lookup_member_if(sc, src_if);
2444 BRIDGE_LOCK2REF(sc, error);
2450 /* Filter on the bridge interface before broadcasting */
2451 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2453 || PFIL_HOOKED(&V_inet6_pfil_hook)
2456 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2462 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2463 dst_if = dbif->bif_ifp;
2464 if (dst_if == src_if)
2467 /* Private segments can not talk to each other */
2468 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2471 if ((dbif->bif_flags & IFBIF_STP) &&
2472 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2475 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2476 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2479 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2482 if (LIST_NEXT(dbif, bif_next) == NULL) {
2486 mc = m_dup(m, M_DONTWAIT);
2488 sc->sc_ifp->if_oerrors++;
2494 * Filter on the output interface. Pass a NULL bridge interface
2495 * pointer so we do not redundantly filter on the bridge for
2496 * each interface we broadcast on.
2498 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2500 || PFIL_HOOKED(&V_inet6_pfil_hook)
2504 /* Keep the layer3 header aligned */
2505 i = min(mc->m_pkthdr.len, max_protohdr);
2506 mc = m_copyup(mc, i, ETHER_ALIGN);
2508 sc->sc_ifp->if_oerrors++;
2512 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2518 bridge_enqueue(sc, dst_if, mc);
2530 * Duplicate a packet out one or more interfaces that are in span mode,
2531 * the original mbuf is unmodified.
2534 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2536 struct bridge_iflist *bif;
2537 struct ifnet *dst_if;
2540 if (LIST_EMPTY(&sc->sc_spanlist))
2543 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2544 dst_if = bif->bif_ifp;
2546 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2549 mc = m_copypacket(m, M_DONTWAIT);
2551 sc->sc_ifp->if_oerrors++;
2555 bridge_enqueue(sc, dst_if, mc);
2562 * Add a bridge routing entry.
2565 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2566 struct bridge_iflist *bif, int setflags, uint8_t flags)
2568 struct bridge_rtnode *brt;
2571 BRIDGE_LOCK_ASSERT(sc);
2573 /* Check the source address is valid and not multicast. */
2574 if (ETHER_IS_MULTICAST(dst) ||
2575 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2576 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2579 /* 802.1p frames map to vlan 1 */
2584 * A route for this destination might already exist. If so,
2585 * update it, otherwise create a new one.
2587 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2588 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2589 sc->sc_brtexceeded++;
2592 /* Check per interface address limits (if enabled) */
2593 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2594 bif->bif_addrexceeded++;
2599 * Allocate a new bridge forwarding node, and
2600 * initialize the expiration time and Ethernet
2603 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2607 if (bif->bif_flags & IFBIF_STICKY)
2608 brt->brt_flags = IFBAF_STICKY;
2610 brt->brt_flags = IFBAF_DYNAMIC;
2612 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2613 brt->brt_vlan = vlan;
2615 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2616 uma_zfree(bridge_rtnode_zone, brt);
2623 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2624 brt->brt_dst != bif) {
2625 brt->brt_dst->bif_addrcnt--;
2627 brt->brt_dst->bif_addrcnt++;
2630 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2631 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2633 brt->brt_flags = flags;
2641 * Lookup the destination interface for an address.
2643 static struct ifnet *
2644 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2646 struct bridge_rtnode *brt;
2648 BRIDGE_LOCK_ASSERT(sc);
2650 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2653 return (brt->brt_ifp);
2659 * Trim the routine table so that we have a number
2660 * of routing entries less than or equal to the
2664 bridge_rttrim(struct bridge_softc *sc)
2666 struct bridge_rtnode *brt, *nbrt;
2668 BRIDGE_LOCK_ASSERT(sc);
2670 /* Make sure we actually need to do this. */
2671 if (sc->sc_brtcnt <= sc->sc_brtmax)
2674 /* Force an aging cycle; this might trim enough addresses. */
2676 if (sc->sc_brtcnt <= sc->sc_brtmax)
2679 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2680 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2681 bridge_rtnode_destroy(sc, brt);
2682 if (sc->sc_brtcnt <= sc->sc_brtmax)
2691 * Aging timer for the bridge.
2694 bridge_timer(void *arg)
2696 struct bridge_softc *sc = arg;
2698 BRIDGE_LOCK_ASSERT(sc);
2702 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2703 callout_reset(&sc->sc_brcallout,
2704 bridge_rtable_prune_period * hz, bridge_timer, sc);
2710 * Perform an aging cycle.
2713 bridge_rtage(struct bridge_softc *sc)
2715 struct bridge_rtnode *brt, *nbrt;
2717 BRIDGE_LOCK_ASSERT(sc);
2719 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2720 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2721 if (time_uptime >= brt->brt_expire)
2722 bridge_rtnode_destroy(sc, brt);
2730 * Remove all dynamic addresses from the bridge.
2733 bridge_rtflush(struct bridge_softc *sc, int full)
2735 struct bridge_rtnode *brt, *nbrt;
2737 BRIDGE_LOCK_ASSERT(sc);
2739 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2740 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2741 bridge_rtnode_destroy(sc, brt);
2748 * Remove an address from the table.
2751 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2753 struct bridge_rtnode *brt;
2756 BRIDGE_LOCK_ASSERT(sc);
2759 * If vlan is zero then we want to delete for all vlans so the lookup
2760 * may return more than one.
2762 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2763 bridge_rtnode_destroy(sc, brt);
2767 return (found ? 0 : ENOENT);
2773 * Delete routes to a speicifc member interface.
2776 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2778 struct bridge_rtnode *brt, *nbrt;
2780 BRIDGE_LOCK_ASSERT(sc);
2782 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2783 if (brt->brt_ifp == ifp && (full ||
2784 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2785 bridge_rtnode_destroy(sc, brt);
2790 * bridge_rtable_init:
2792 * Initialize the route table for this bridge.
2795 bridge_rtable_init(struct bridge_softc *sc)
2799 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2800 M_DEVBUF, M_NOWAIT);
2801 if (sc->sc_rthash == NULL)
2804 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2805 LIST_INIT(&sc->sc_rthash[i]);
2807 sc->sc_rthash_key = arc4random();
2809 LIST_INIT(&sc->sc_rtlist);
2815 * bridge_rtable_fini:
2817 * Deconstruct the route table for this bridge.
2820 bridge_rtable_fini(struct bridge_softc *sc)
2823 KASSERT(sc->sc_brtcnt == 0,
2824 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2825 free(sc->sc_rthash, M_DEVBUF);
2829 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2830 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2832 #define mix(a, b, c) \
2834 a -= b; a -= c; a ^= (c >> 13); \
2835 b -= c; b -= a; b ^= (a << 8); \
2836 c -= a; c -= b; c ^= (b >> 13); \
2837 a -= b; a -= c; a ^= (c >> 12); \
2838 b -= c; b -= a; b ^= (a << 16); \
2839 c -= a; c -= b; c ^= (b >> 5); \
2840 a -= b; a -= c; a ^= (c >> 3); \
2841 b -= c; b -= a; b ^= (a << 10); \
2842 c -= a; c -= b; c ^= (b >> 15); \
2843 } while (/*CONSTCOND*/0)
2845 static __inline uint32_t
2846 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2848 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2859 return (c & BRIDGE_RTHASH_MASK);
2865 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2869 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2870 d = ((int)a[i]) - ((int)b[i]);
2877 * bridge_rtnode_lookup:
2879 * Look up a bridge route node for the specified destination. Compare the
2880 * vlan id or if zero then just return the first match.
2882 static struct bridge_rtnode *
2883 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2885 struct bridge_rtnode *brt;
2889 BRIDGE_LOCK_ASSERT(sc);
2891 hash = bridge_rthash(sc, addr);
2892 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2893 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2894 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2904 * bridge_rtnode_insert:
2906 * Insert the specified bridge node into the route table. We
2907 * assume the entry is not already in the table.
2910 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2912 struct bridge_rtnode *lbrt;
2916 BRIDGE_LOCK_ASSERT(sc);
2918 hash = bridge_rthash(sc, brt->brt_addr);
2920 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2922 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2927 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2928 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2931 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2934 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2935 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2938 lbrt = LIST_NEXT(lbrt, brt_hash);
2939 } while (lbrt != NULL);
2942 panic("bridge_rtnode_insert: impossible");
2946 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2953 * bridge_rtnode_destroy:
2955 * Destroy a bridge rtnode.
2958 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2960 BRIDGE_LOCK_ASSERT(sc);
2962 LIST_REMOVE(brt, brt_hash);
2964 LIST_REMOVE(brt, brt_list);
2966 brt->brt_dst->bif_addrcnt--;
2967 uma_zfree(bridge_rtnode_zone, brt);
2971 * bridge_rtable_expire:
2973 * Set the expiry time for all routes on an interface.
2976 bridge_rtable_expire(struct ifnet *ifp, int age)
2978 struct bridge_softc *sc = ifp->if_bridge;
2979 struct bridge_rtnode *brt;
2984 * If the age is zero then flush, otherwise set all the expiry times to
2985 * age for the interface
2988 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2990 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2991 /* Cap the expiry time to 'age' */
2992 if (brt->brt_ifp == ifp &&
2993 brt->brt_expire > time_uptime + age &&
2994 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2995 brt->brt_expire = time_uptime + age;
3002 * bridge_state_change:
3004 * Callback from the bridgestp code when a port changes states.
3007 bridge_state_change(struct ifnet *ifp, int state)
3009 struct bridge_softc *sc = ifp->if_bridge;
3010 static const char *stpstates[] = {
3020 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3021 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3025 * Send bridge packets through pfil if they are one of the types pfil can deal
3026 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
3027 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3031 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3033 int snap, error, i, hlen;
3034 struct ether_header *eh1, eh2;
3035 struct ip_fw_args args;
3038 u_int16_t ether_type;
3041 error = -1; /* Default error if not error == 0 */
3044 /* we may return with the IP fields swapped, ensure its not shared */
3045 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3048 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
3049 return (0); /* filtering is disabled */
3051 i = min((*mp)->m_pkthdr.len, max_protohdr);
3052 if ((*mp)->m_len < i) {
3053 *mp = m_pullup(*mp, i);
3055 printf("%s: m_pullup failed\n", __func__);
3060 eh1 = mtod(*mp, struct ether_header *);
3061 ether_type = ntohs(eh1->ether_type);
3064 * Check for SNAP/LLC.
3066 if (ether_type < ETHERMTU) {
3067 struct llc *llc2 = (struct llc *)(eh1 + 1);
3069 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3070 llc2->llc_dsap == LLC_SNAP_LSAP &&
3071 llc2->llc_ssap == LLC_SNAP_LSAP &&
3072 llc2->llc_control == LLC_UI) {
3073 ether_type = htons(llc2->llc_un.type_snap.ether_type);
3079 * If we're trying to filter bridge traffic, don't look at anything
3080 * other than IP and ARP traffic. If the filter doesn't understand
3081 * IPv6, don't allow IPv6 through the bridge either. This is lame
3082 * since if we really wanted, say, an AppleTalk filter, we are hosed,
3083 * but of course we don't have an AppleTalk filter to begin with.
3084 * (Note that since pfil doesn't understand ARP it will pass *ALL*
3087 switch (ether_type) {
3089 case ETHERTYPE_REVARP:
3090 if (pfil_ipfw_arp == 0)
3091 return (0); /* Automatically pass */
3096 case ETHERTYPE_IPV6:
3101 * Check to see if the user wants to pass non-ip
3102 * packets, these will not be checked by pfil(9) and
3103 * passed unconditionally so the default is to drop.
3109 /* Strip off the Ethernet header and keep a copy. */
3110 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3111 m_adj(*mp, ETHER_HDR_LEN);
3113 /* Strip off snap header, if present */
3115 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3116 m_adj(*mp, sizeof(struct llc));
3120 * Check the IP header for alignment and errors
3122 if (dir == PFIL_IN) {
3123 switch (ether_type) {
3125 error = bridge_ip_checkbasic(mp);
3128 case ETHERTYPE_IPV6:
3129 error = bridge_ip6_checkbasic(mp);
3139 /* XXX this section is also in if_ethersubr.c */
3140 // XXX PFIL_OUT or DIR_OUT ?
3141 if (V_ip_fw_chk_ptr && pfil_ipfw != 0 &&
3142 dir == PFIL_OUT && ifp != NULL) {
3146 /* fetch the start point from existing tags, if any */
3147 mtag = m_tag_locate(*mp, MTAG_IPFW_RULE, 0, NULL);
3151 struct ipfw_rule_ref *r;
3153 /* XXX can we free the tag after use ? */
3154 mtag->m_tag_id = PACKET_TAG_NONE;
3155 r = (struct ipfw_rule_ref *)(mtag + 1);
3156 /* packet already partially processed ? */
3157 if (r->info & IPFW_ONEPASS)
3164 args.next_hop = NULL;
3165 args.next_hop6 = NULL;
3167 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
3168 i = V_ip_fw_chk_ptr(&args);
3174 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) {
3176 /* put the Ethernet header back on */
3177 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3180 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3183 * Pass the pkt to dummynet, which consumes it. The
3184 * packet will return to us via bridge_dummynet().
3187 ip_dn_io_ptr(mp, DIR_FWD | PROTO_IFB, &args);
3191 if (i != IP_FW_PASS) /* drop */
3199 * Run the packet through pfil
3201 switch (ether_type) {
3204 * before calling the firewall, swap fields the same as
3205 * IP does. here we assume the header is contiguous
3207 ip = mtod(*mp, struct ip *);
3209 ip->ip_len = ntohs(ip->ip_len);
3210 ip->ip_off = ntohs(ip->ip_off);
3213 * Run pfil on the member interface and the bridge, both can
3214 * be skipped by clearing pfil_member or pfil_bridge.
3217 * in_if -> bridge_if -> out_if
3219 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3220 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3223 if (*mp == NULL || error != 0) /* filter may consume */
3226 if (pfil_member && ifp != NULL)
3227 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3230 if (*mp == NULL || error != 0) /* filter may consume */
3233 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3234 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3237 if (*mp == NULL || error != 0) /* filter may consume */
3240 /* check if we need to fragment the packet */
3241 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3242 i = (*mp)->m_pkthdr.len;
3243 if (i > ifp->if_mtu) {
3244 error = bridge_fragment(ifp, *mp, &eh2, snap,
3250 /* Recalculate the ip checksum and restore byte ordering */
3251 ip = mtod(*mp, struct ip *);
3252 hlen = ip->ip_hl << 2;
3253 if (hlen < sizeof(struct ip))
3255 if (hlen > (*mp)->m_len) {
3256 if ((*mp = m_pullup(*mp, hlen)) == 0)
3258 ip = mtod(*mp, struct ip *);
3262 ip->ip_len = htons(ip->ip_len);
3263 ip->ip_off = htons(ip->ip_off);
3265 if (hlen == sizeof(struct ip))
3266 ip->ip_sum = in_cksum_hdr(ip);
3268 ip->ip_sum = in_cksum(*mp, hlen);
3272 case ETHERTYPE_IPV6:
3273 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3274 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3277 if (*mp == NULL || error != 0) /* filter may consume */
3280 if (pfil_member && ifp != NULL)
3281 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3284 if (*mp == NULL || error != 0) /* filter may consume */
3287 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3288 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3305 * Finally, put everything back the way it was and return
3308 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
3311 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3314 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3317 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3328 * Perform basic checks on header size since
3329 * pfil assumes ip_input has already processed
3330 * it for it. Cut-and-pasted from ip_input.c.
3331 * Given how simple the IPv6 version is,
3332 * does the IPv4 version really need to be
3335 * XXX Should we update ipstat here, or not?
3336 * XXX Right now we update ipstat but not
3340 bridge_ip_checkbasic(struct mbuf **mp)
3342 struct mbuf *m = *mp;
3350 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3351 if ((m = m_copyup(m, sizeof(struct ip),
3352 (max_linkhdr + 3) & ~3)) == NULL) {
3353 /* XXXJRT new stat, please */
3354 KMOD_IPSTAT_INC(ips_toosmall);
3357 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3358 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3359 KMOD_IPSTAT_INC(ips_toosmall);
3363 ip = mtod(m, struct ip *);
3364 if (ip == NULL) goto bad;
3366 if (ip->ip_v != IPVERSION) {
3367 KMOD_IPSTAT_INC(ips_badvers);
3370 hlen = ip->ip_hl << 2;
3371 if (hlen < sizeof(struct ip)) { /* minimum header length */
3372 KMOD_IPSTAT_INC(ips_badhlen);
3375 if (hlen > m->m_len) {
3376 if ((m = m_pullup(m, hlen)) == 0) {
3377 KMOD_IPSTAT_INC(ips_badhlen);
3380 ip = mtod(m, struct ip *);
3381 if (ip == NULL) goto bad;
3384 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3385 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3387 if (hlen == sizeof(struct ip)) {
3388 sum = in_cksum_hdr(ip);
3390 sum = in_cksum(m, hlen);
3394 KMOD_IPSTAT_INC(ips_badsum);
3398 /* Retrieve the packet length. */
3399 len = ntohs(ip->ip_len);
3402 * Check for additional length bogosity
3405 KMOD_IPSTAT_INC(ips_badlen);
3410 * Check that the amount of data in the buffers
3411 * is as at least much as the IP header would have us expect.
3412 * Drop packet if shorter than we expect.
3414 if (m->m_pkthdr.len < len) {
3415 KMOD_IPSTAT_INC(ips_tooshort);
3419 /* Checks out, proceed */
3430 * Same as above, but for IPv6.
3431 * Cut-and-pasted from ip6_input.c.
3432 * XXX Should we update ip6stat, or not?
3435 bridge_ip6_checkbasic(struct mbuf **mp)
3437 struct mbuf *m = *mp;
3438 struct ip6_hdr *ip6;
3441 * If the IPv6 header is not aligned, slurp it up into a new
3442 * mbuf with space for link headers, in the event we forward
3443 * it. Otherwise, if it is aligned, make sure the entire base
3444 * IPv6 header is in the first mbuf of the chain.
3446 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3447 struct ifnet *inifp = m->m_pkthdr.rcvif;
3448 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3449 (max_linkhdr + 3) & ~3)) == NULL) {
3450 /* XXXJRT new stat, please */
3451 IP6STAT_INC(ip6s_toosmall);
3452 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3455 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3456 struct ifnet *inifp = m->m_pkthdr.rcvif;
3457 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3458 IP6STAT_INC(ip6s_toosmall);
3459 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3464 ip6 = mtod(m, struct ip6_hdr *);
3466 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3467 IP6STAT_INC(ip6s_badvers);
3468 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3472 /* Checks out, proceed */
3485 * Return a fragmented mbuf chain.
3488 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3489 int snap, struct llc *llc)
3495 if (m->m_len < sizeof(struct ip) &&
3496 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3498 ip = mtod(m, struct ip *);
3500 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
3505 /* walk the chain and re-add the Ethernet header */
3506 for (m0 = m; m0; m0 = m0->m_nextpkt) {
3509 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
3514 bcopy(llc, mtod(m0, caddr_t),
3515 sizeof(struct llc));
3517 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
3522 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3528 KMOD_IPSTAT_INC(ips_fragmented);
3539 bridge_linkstate(struct ifnet *ifp)
3541 struct bridge_softc *sc = ifp->if_bridge;
3542 struct bridge_iflist *bif;
3545 bif = bridge_lookup_member_if(sc, ifp);
3550 bridge_linkcheck(sc);
3553 bstp_linkstate(&bif->bif_stp);
3557 bridge_linkcheck(struct bridge_softc *sc)
3559 struct bridge_iflist *bif;
3560 int new_link, hasls;
3562 BRIDGE_LOCK_ASSERT(sc);
3563 new_link = LINK_STATE_DOWN;
3565 /* Our link is considered up if at least one of our ports is active */
3566 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3567 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3569 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3570 new_link = LINK_STATE_UP;
3574 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3575 /* If no interfaces support link-state then we default to up */
3576 new_link = LINK_STATE_UP;
3578 if_link_state_change(sc->sc_ifp, new_link);