FreeBSD/Linux Kernel Cross Reference
sys/net/if_bridge.c
1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
2
3 /*
4 * Copyright 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
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
23 * written permission.
24 *
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.
36 */
37
38 /*
39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
40 * All rights reserved.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
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.
50 * 3. All advertising materials mentioning features or use of this software
51 * must display the following acknowledgement:
52 * This product includes software developed by Jason L. Wright
53 * 4. The name of the author may not be used to endorse or promote products
54 * derived from this software without specific prior written permission.
55 *
56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66 * POSSIBILITY OF SUCH DAMAGE.
67 *
68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
69 */
70
71 /*
72 * Network interface bridge support.
73 *
74 * TODO:
75 *
76 * - Currently only supports Ethernet-like interfaces (Ethernet,
77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
78 * to bridge other types of interfaces (FDDI-FDDI, and maybe
79 * consider heterogenous bridges).
80 */
81
82 #include <sys/cdefs.h>
83 __FBSDID("$FreeBSD: releng/6.3/sys/net/if_bridge.c 174828 2007-12-21 05:30:47Z thompsa $");
84
85 #include "opt_inet.h"
86 #include "opt_inet6.h"
87 #include "opt_carp.h"
88
89 #include <sys/param.h>
90 #include <sys/mbuf.h>
91 #include <sys/malloc.h>
92 #include <sys/protosw.h>
93 #include <sys/systm.h>
94 #include <sys/time.h>
95 #include <sys/socket.h> /* for net/if.h */
96 #include <sys/sockio.h>
97 #include <sys/ctype.h> /* string functions */
98 #include <sys/kernel.h>
99 #include <sys/random.h>
100 #include <sys/syslog.h>
101 #include <sys/sysctl.h>
102 #include <vm/uma.h>
103 #include <sys/module.h>
104 #include <sys/proc.h>
105 #include <sys/lock.h>
106 #include <sys/mutex.h>
107
108 #include <net/bpf.h>
109 #include <net/if.h>
110 #include <net/if_clone.h>
111 #include <net/if_dl.h>
112 #include <net/if_types.h>
113 #include <net/if_var.h>
114 #include <net/pfil.h>
115
116 #include <netinet/in.h> /* for struct arpcom */
117 #include <netinet/in_systm.h>
118 #include <netinet/in_var.h>
119 #include <netinet/ip.h>
120 #include <netinet/ip_var.h>
121 #ifdef INET6
122 #include <netinet/ip6.h>
123 #include <netinet6/ip6_var.h>
124 #endif
125 #ifdef DEV_CARP
126 #include <netinet/ip_carp.h>
127 #endif
128 #include <machine/in_cksum.h>
129 #include <netinet/if_ether.h> /* for struct arpcom */
130 #include <net/bridgestp.h>
131 #include <net/if_bridgevar.h>
132 #include <net/if_llc.h>
133
134 #include <net/route.h>
135 #include <netinet/ip_fw.h>
136 #include <netinet/ip_dummynet.h>
137
138 /*
139 * Size of the route hash table. Must be a power of two.
140 */
141 #ifndef BRIDGE_RTHASH_SIZE
142 #define BRIDGE_RTHASH_SIZE 1024
143 #endif
144
145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
146
147 /*
148 * Maximum number of addresses to cache.
149 */
150 #ifndef BRIDGE_RTABLE_MAX
151 #define BRIDGE_RTABLE_MAX 100
152 #endif
153
154 /*
155 * Timeout (in seconds) for entries learned dynamically.
156 */
157 #ifndef BRIDGE_RTABLE_TIMEOUT
158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
159 #endif
160
161 /*
162 * Number of seconds between walks of the route list.
163 */
164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
166 #endif
167
168 /*
169 * List of capabilities to mask on the member interface.
170 */
171 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM
172
173 /*
174 * Bridge interface list entry.
175 */
176 struct bridge_iflist {
177 LIST_ENTRY(bridge_iflist) bif_next;
178 struct ifnet *bif_ifp; /* member if */
179 struct bstp_port bif_stp; /* STP state */
180 uint32_t bif_flags; /* member if flags */
181 int bif_mutecap; /* member muted caps */
182 };
183
184 /*
185 * Bridge route node.
186 */
187 struct bridge_rtnode {
188 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
189 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
190 struct ifnet *brt_ifp; /* destination if */
191 unsigned long brt_expire; /* expiration time */
192 uint8_t brt_flags; /* address flags */
193 uint8_t brt_addr[ETHER_ADDR_LEN];
194 };
195
196 /*
197 * Software state for each bridge.
198 */
199 struct bridge_softc {
200 struct ifnet *sc_ifp; /* make this an interface */
201 LIST_ENTRY(bridge_softc) sc_list;
202 struct mtx sc_mtx;
203 struct cv sc_cv;
204 uint32_t sc_brtmax; /* max # of addresses */
205 uint32_t sc_brtcnt; /* cur. # of addresses */
206 uint32_t sc_brttimeout; /* rt timeout in seconds */
207 struct callout sc_brcallout; /* bridge callout */
208 uint32_t sc_iflist_ref; /* refcount for sc_iflist */
209 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
210 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
211 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
212 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
213 uint32_t sc_rthash_key; /* key for hash */
214 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
215 struct bstp_state sc_stp; /* STP state */
216 uint32_t sc_brtexceeded; /* # of cache drops */
217 };
218
219 static struct mtx bridge_list_mtx;
220 eventhandler_tag bridge_detach_cookie = NULL;
221
222 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
223
224 uma_zone_t bridge_rtnode_zone;
225
226 static int bridge_clone_create(struct if_clone *, int);
227 static void bridge_clone_destroy(struct ifnet *);
228
229 static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
230 static void bridge_mutecaps(struct bridge_iflist *, int);
231 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
232 static void bridge_init(void *);
233 static void bridge_dummynet(struct mbuf *, struct ifnet *);
234 static void bridge_stop(struct ifnet *, int);
235 static void bridge_start(struct ifnet *);
236 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
237 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
238 struct rtentry *);
239 static void bridge_enqueue(struct bridge_softc *, struct ifnet *,
240 struct mbuf *);
241 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
242
243 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
244 struct mbuf *m);
245
246 static void bridge_timer(void *);
247
248 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
249 struct mbuf *, int);
250 static void bridge_span(struct bridge_softc *, struct mbuf *);
251
252 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
253 struct bridge_iflist *, int, uint8_t);
254 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *);
255 static void bridge_rttrim(struct bridge_softc *);
256 static void bridge_rtage(struct bridge_softc *);
257 static void bridge_rtflush(struct bridge_softc *, int);
258 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
259
260 static int bridge_rtable_init(struct bridge_softc *);
261 static void bridge_rtable_fini(struct bridge_softc *);
262
263 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
264 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
265 const uint8_t *);
266 static int bridge_rtnode_insert(struct bridge_softc *,
267 struct bridge_rtnode *);
268 static void bridge_rtnode_destroy(struct bridge_softc *,
269 struct bridge_rtnode *);
270 static void bridge_rtable_expire(struct ifnet *, int);
271 static void bridge_state_change(struct ifnet *, int);
272
273 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
274 const char *name);
275 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
276 struct ifnet *ifp);
277 static void bridge_delete_member(struct bridge_softc *,
278 struct bridge_iflist *, int);
279 static void bridge_delete_span(struct bridge_softc *,
280 struct bridge_iflist *);
281
282 static int bridge_ioctl_add(struct bridge_softc *, void *);
283 static int bridge_ioctl_del(struct bridge_softc *, void *);
284 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
285 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
286 static int bridge_ioctl_scache(struct bridge_softc *, void *);
287 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
288 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
289 static int bridge_ioctl_rts(struct bridge_softc *, void *);
290 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
291 static int bridge_ioctl_sto(struct bridge_softc *, void *);
292 static int bridge_ioctl_gto(struct bridge_softc *, void *);
293 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
294 static int bridge_ioctl_flush(struct bridge_softc *, void *);
295 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
296 static int bridge_ioctl_spri(struct bridge_softc *, void *);
297 static int bridge_ioctl_ght(struct bridge_softc *, void *);
298 static int bridge_ioctl_sht(struct bridge_softc *, void *);
299 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
300 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
301 static int bridge_ioctl_gma(struct bridge_softc *, void *);
302 static int bridge_ioctl_sma(struct bridge_softc *, void *);
303 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
304 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
305 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
306 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
307 static int bridge_ioctl_gbparam(struct bridge_softc *, void *);
308 static int bridge_ioctl_grte(struct bridge_softc *, void *);
309 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
310 static int bridge_ioctl_sproto(struct bridge_softc *, void *);
311 static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
312 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
313 int);
314 static int bridge_ip_checkbasic(struct mbuf **mp);
315 #ifdef INET6
316 static int bridge_ip6_checkbasic(struct mbuf **mp);
317 #endif /* INET6 */
318 static int bridge_fragment(struct ifnet *, struct mbuf *,
319 struct ether_header *, int, struct llc *);
320
321 static struct bstp_cb_ops bridge_ops = {
322 .bcb_state = bridge_state_change,
323 .bcb_rtage = bridge_rtable_expire
324 };
325
326 SYSCTL_DECL(_net_link);
327 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
328
329 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
330 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
331 static int pfil_member = 1; /* run pfil hooks on the member interface */
332 static int pfil_ipfw = 0; /* layer2 filter with ipfw */
333 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */
334 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
335 locally destined packets */
336 static int log_stp = 0; /* log STP state changes */
337 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
338 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
339 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
340 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
341 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
342 &pfil_bridge, 0, "Packet filter on the bridge interface");
343 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
344 &pfil_member, 0, "Packet filter on the member interface");
345 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
346 &pfil_local_phys, 0,
347 "Packet filter on the physical interface for locally destined packets");
348 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
349 &log_stp, 0, "Log STP state changes");
350
351 struct bridge_control {
352 int (*bc_func)(struct bridge_softc *, void *);
353 int bc_argsize;
354 int bc_flags;
355 };
356
357 #define BC_F_COPYIN 0x01 /* copy arguments in */
358 #define BC_F_COPYOUT 0x02 /* copy arguments out */
359 #define BC_F_SUSER 0x04 /* do super-user check */
360
361 const struct bridge_control bridge_control_table[] = {
362 { bridge_ioctl_add, sizeof(struct ifbreq),
363 BC_F_COPYIN|BC_F_SUSER },
364 { bridge_ioctl_del, sizeof(struct ifbreq),
365 BC_F_COPYIN|BC_F_SUSER },
366
367 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
368 BC_F_COPYIN|BC_F_COPYOUT },
369 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
370 BC_F_COPYIN|BC_F_SUSER },
371
372 { bridge_ioctl_scache, sizeof(struct ifbrparam),
373 BC_F_COPYIN|BC_F_SUSER },
374 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
375 BC_F_COPYOUT },
376
377 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
378 BC_F_COPYIN|BC_F_COPYOUT },
379 { bridge_ioctl_rts, sizeof(struct ifbaconf),
380 BC_F_COPYIN|BC_F_COPYOUT },
381
382 { bridge_ioctl_saddr, sizeof(struct ifbareq),
383 BC_F_COPYIN|BC_F_SUSER },
384
385 { bridge_ioctl_sto, sizeof(struct ifbrparam),
386 BC_F_COPYIN|BC_F_SUSER },
387 { bridge_ioctl_gto, sizeof(struct ifbrparam),
388 BC_F_COPYOUT },
389
390 { bridge_ioctl_daddr, sizeof(struct ifbareq),
391 BC_F_COPYIN|BC_F_SUSER },
392
393 { bridge_ioctl_flush, sizeof(struct ifbreq),
394 BC_F_COPYIN|BC_F_SUSER },
395
396 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
397 BC_F_COPYOUT },
398 { bridge_ioctl_spri, sizeof(struct ifbrparam),
399 BC_F_COPYIN|BC_F_SUSER },
400
401 { bridge_ioctl_ght, sizeof(struct ifbrparam),
402 BC_F_COPYOUT },
403 { bridge_ioctl_sht, sizeof(struct ifbrparam),
404 BC_F_COPYIN|BC_F_SUSER },
405
406 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
407 BC_F_COPYOUT },
408 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
409 BC_F_COPYIN|BC_F_SUSER },
410
411 { bridge_ioctl_gma, sizeof(struct ifbrparam),
412 BC_F_COPYOUT },
413 { bridge_ioctl_sma, sizeof(struct ifbrparam),
414 BC_F_COPYIN|BC_F_SUSER },
415
416 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
417 BC_F_COPYIN|BC_F_SUSER },
418
419 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
420 BC_F_COPYIN|BC_F_SUSER },
421
422 { bridge_ioctl_addspan, sizeof(struct ifbreq),
423 BC_F_COPYIN|BC_F_SUSER },
424 { bridge_ioctl_delspan, sizeof(struct ifbreq),
425 BC_F_COPYIN|BC_F_SUSER },
426
427 { bridge_ioctl_gbparam, sizeof(struct ifbropreq),
428 BC_F_COPYOUT },
429
430 { bridge_ioctl_grte, sizeof(struct ifbrparam),
431 BC_F_COPYOUT },
432
433 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
434 BC_F_COPYIN|BC_F_COPYOUT },
435
436 { bridge_ioctl_sproto, sizeof(struct ifbrparam),
437 BC_F_COPYIN|BC_F_SUSER },
438
439 { bridge_ioctl_stxhc, sizeof(struct ifbrparam),
440 BC_F_COPYIN|BC_F_SUSER },
441 };
442 const int bridge_control_table_size =
443 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
444
445 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
446 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
447
448 LIST_HEAD(, bridge_softc) bridge_list;
449
450 IFC_SIMPLE_DECLARE(bridge, 0);
451
452 static int
453 bridge_modevent(module_t mod, int type, void *data)
454 {
455
456 switch (type) {
457 case MOD_LOAD:
458 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
459 if_clone_attach(&bridge_cloner);
460 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
461 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
462 UMA_ALIGN_PTR, 0);
463 LIST_INIT(&bridge_list);
464 bridge_input_p = bridge_input;
465 bridge_output_p = bridge_output;
466 bridge_dn_p = bridge_dummynet;
467 bridge_detach_cookie = EVENTHANDLER_REGISTER(
468 ifnet_departure_event, bridge_ifdetach, NULL,
469 EVENTHANDLER_PRI_ANY);
470 break;
471 case MOD_UNLOAD:
472 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
473 bridge_detach_cookie);
474 if_clone_detach(&bridge_cloner);
475 while (!LIST_EMPTY(&bridge_list))
476 bridge_clone_destroy(LIST_FIRST(&bridge_list)->sc_ifp);
477 uma_zdestroy(bridge_rtnode_zone);
478 bridge_input_p = NULL;
479 bridge_output_p = NULL;
480 bridge_dn_p = NULL;
481 mtx_destroy(&bridge_list_mtx);
482 break;
483 default:
484 return (EOPNOTSUPP);
485 }
486 return (0);
487 }
488
489 static moduledata_t bridge_mod = {
490 "if_bridge",
491 bridge_modevent,
492 0
493 };
494
495 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
496 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
497
498 /*
499 * handler for net.link.bridge.pfil_ipfw
500 */
501 static int
502 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
503 {
504 int enable = pfil_ipfw;
505 int error;
506
507 error = sysctl_handle_int(oidp, &enable, 0, req);
508 enable = (enable) ? 1 : 0;
509
510 if (enable != pfil_ipfw) {
511 pfil_ipfw = enable;
512
513 /*
514 * Disable pfil so that ipfw doesnt run twice, if the user
515 * really wants both then they can re-enable pfil_bridge and/or
516 * pfil_member. Also allow non-ip packets as ipfw can filter by
517 * layer2 type.
518 */
519 if (pfil_ipfw) {
520 pfil_onlyip = 0;
521 pfil_bridge = 0;
522 pfil_member = 0;
523 }
524 }
525
526 return (error);
527 }
528 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
529 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
530
531 /*
532 * bridge_clone_create:
533 *
534 * Create a new bridge instance.
535 */
536 static int
537 bridge_clone_create(struct if_clone *ifc, int unit)
538 {
539 struct bridge_softc *sc, *sc2;
540 struct ifnet *bifp, *ifp;
541 u_char eaddr[6];
542 int retry;
543
544 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
545 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
546 if (ifp == NULL) {
547 free(sc, M_DEVBUF);
548 return (ENOSPC);
549 }
550
551 BRIDGE_LOCK_INIT(sc);
552 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
553 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
554
555 /* Initialize our routing table. */
556 bridge_rtable_init(sc);
557
558 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
559
560 LIST_INIT(&sc->sc_iflist);
561 LIST_INIT(&sc->sc_spanlist);
562
563 ifp->if_softc = sc;
564 if_initname(ifp, ifc->ifc_name, unit);
565 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
566 ifp->if_ioctl = bridge_ioctl;
567 ifp->if_start = bridge_start;
568 ifp->if_init = bridge_init;
569 ifp->if_type = IFT_BRIDGE;
570 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
571 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
572 IFQ_SET_READY(&ifp->if_snd);
573
574 /*
575 * Generate a random ethernet address with a locally administered
576 * address.
577 *
578 * Since we are using random ethernet addresses for the bridge, it is
579 * possible that we might have address collisions, so make sure that
580 * this hardware address isn't already in use on another bridge.
581 */
582 for (retry = 1; retry != 0;) {
583 arc4rand(eaddr, ETHER_ADDR_LEN, 1);
584 eaddr[0] &= ~1; /* clear multicast bit */
585 eaddr[0] |= 2; /* set the LAA bit */
586 retry = 0;
587 mtx_lock(&bridge_list_mtx);
588 LIST_FOREACH(sc2, &bridge_list, sc_list) {
589 bifp = sc2->sc_ifp;
590 if (memcmp(eaddr, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
591 retry = 1;
592 }
593 mtx_unlock(&bridge_list_mtx);
594 }
595
596 bstp_attach(&sc->sc_stp, &bridge_ops);
597 ether_ifattach(ifp, eaddr);
598 /* Now undo some of the damage... */
599 ifp->if_baudrate = 0;
600 ifp->if_type = IFT_BRIDGE;
601
602 mtx_lock(&bridge_list_mtx);
603 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
604 mtx_unlock(&bridge_list_mtx);
605
606 return (0);
607 }
608
609 /*
610 * bridge_clone_destroy:
611 *
612 * Destroy a bridge instance.
613 */
614 static void
615 bridge_clone_destroy(struct ifnet *ifp)
616 {
617 struct bridge_softc *sc = ifp->if_softc;
618 struct bridge_iflist *bif;
619
620 BRIDGE_LOCK(sc);
621
622 bridge_stop(ifp, 1);
623 ifp->if_flags &= ~IFF_UP;
624
625 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
626 bridge_delete_member(sc, bif, 0);
627
628 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
629 bridge_delete_span(sc, bif);
630 }
631
632 BRIDGE_UNLOCK(sc);
633
634 callout_drain(&sc->sc_brcallout);
635
636 mtx_lock(&bridge_list_mtx);
637 LIST_REMOVE(sc, sc_list);
638 mtx_unlock(&bridge_list_mtx);
639
640 bstp_detach(&sc->sc_stp);
641 ether_ifdetach(ifp);
642 if_free_type(ifp, IFT_ETHER);
643
644 /* Tear down the routing table. */
645 bridge_rtable_fini(sc);
646
647 BRIDGE_LOCK_DESTROY(sc);
648 free(sc, M_DEVBUF);
649 }
650
651 /*
652 * bridge_ioctl:
653 *
654 * Handle a control request from the operator.
655 */
656 static int
657 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
658 {
659 struct bridge_softc *sc = ifp->if_softc;
660 struct thread *td = curthread;
661 union {
662 struct ifbreq ifbreq;
663 struct ifbifconf ifbifconf;
664 struct ifbareq ifbareq;
665 struct ifbaconf ifbaconf;
666 struct ifbrparam ifbrparam;
667 struct ifbropreq ifbropreq;
668 } args;
669 struct ifdrv *ifd = (struct ifdrv *) data;
670 const struct bridge_control *bc;
671 int error = 0;
672
673 switch (cmd) {
674
675 case SIOCADDMULTI:
676 case SIOCDELMULTI:
677 break;
678
679 case SIOCGDRVSPEC:
680 case SIOCSDRVSPEC:
681 if (ifd->ifd_cmd >= bridge_control_table_size) {
682 error = EINVAL;
683 break;
684 }
685 bc = &bridge_control_table[ifd->ifd_cmd];
686
687 if (cmd == SIOCGDRVSPEC &&
688 (bc->bc_flags & BC_F_COPYOUT) == 0) {
689 error = EINVAL;
690 break;
691 }
692 else if (cmd == SIOCSDRVSPEC &&
693 (bc->bc_flags & BC_F_COPYOUT) != 0) {
694 error = EINVAL;
695 break;
696 }
697
698 if (bc->bc_flags & BC_F_SUSER) {
699 error = suser(td);
700 if (error)
701 break;
702 }
703
704 if (ifd->ifd_len != bc->bc_argsize ||
705 ifd->ifd_len > sizeof(args)) {
706 error = EINVAL;
707 break;
708 }
709
710 bzero(&args, sizeof(args));
711 if (bc->bc_flags & BC_F_COPYIN) {
712 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
713 if (error)
714 break;
715 }
716
717 BRIDGE_LOCK(sc);
718 error = (*bc->bc_func)(sc, &args);
719 BRIDGE_UNLOCK(sc);
720 if (error)
721 break;
722
723 if (bc->bc_flags & BC_F_COPYOUT)
724 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
725
726 break;
727
728 case SIOCSIFFLAGS:
729 if (!(ifp->if_flags & IFF_UP) &&
730 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
731 /*
732 * If interface is marked down and it is running,
733 * then stop and disable it.
734 */
735 BRIDGE_LOCK(sc);
736 bridge_stop(ifp, 1);
737 BRIDGE_UNLOCK(sc);
738 } else if ((ifp->if_flags & IFF_UP) &&
739 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
740 /*
741 * If interface is marked up and it is stopped, then
742 * start it.
743 */
744 (*ifp->if_init)(sc);
745 }
746 break;
747
748 case SIOCSIFMTU:
749 /* Do not allow the MTU to be changed on the bridge */
750 error = EINVAL;
751 break;
752
753 default:
754 /*
755 * drop the lock as ether_ioctl() will call bridge_start() and
756 * cause the lock to be recursed.
757 */
758 error = ether_ioctl(ifp, cmd, data);
759 break;
760 }
761
762 return (error);
763 }
764
765 /*
766 * bridge_mutecaps:
767 *
768 * Clear or restore unwanted capabilities on the member interface
769 */
770 static void
771 bridge_mutecaps(struct bridge_iflist *bif, int mute)
772 {
773 struct ifnet *ifp = bif->bif_ifp;
774 struct ifreq ifr;
775 int error;
776
777 if (ifp->if_ioctl == NULL)
778 return;
779
780 bzero(&ifr, sizeof(ifr));
781 ifr.ifr_reqcap = ifp->if_capenable;
782
783 if (mute) {
784 /* mask off and save capabilities */
785 bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK;
786 if (bif->bif_mutecap != 0)
787 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK;
788 } else
789 /* restore muted capabilities */
790 ifr.ifr_reqcap |= bif->bif_mutecap;
791
792
793 if (bif->bif_mutecap != 0) {
794 IFF_LOCKGIANT(ifp);
795 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
796 IFF_UNLOCKGIANT(ifp);
797 }
798 }
799
800 /*
801 * bridge_lookup_member:
802 *
803 * Lookup a bridge member interface.
804 */
805 static struct bridge_iflist *
806 bridge_lookup_member(struct bridge_softc *sc, const char *name)
807 {
808 struct bridge_iflist *bif;
809 struct ifnet *ifp;
810
811 BRIDGE_LOCK_ASSERT(sc);
812
813 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
814 ifp = bif->bif_ifp;
815 if (strcmp(ifp->if_xname, name) == 0)
816 return (bif);
817 }
818
819 return (NULL);
820 }
821
822 /*
823 * bridge_lookup_member_if:
824 *
825 * Lookup a bridge member interface by ifnet*.
826 */
827 static struct bridge_iflist *
828 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
829 {
830 struct bridge_iflist *bif;
831
832 BRIDGE_LOCK_ASSERT(sc);
833
834 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
835 if (bif->bif_ifp == member_ifp)
836 return (bif);
837 }
838
839 return (NULL);
840 }
841
842 /*
843 * bridge_delete_member:
844 *
845 * Delete the specified member interface.
846 */
847 static void
848 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
849 int gone)
850 {
851 struct ifnet *ifs = bif->bif_ifp;
852
853 BRIDGE_LOCK_ASSERT(sc);
854
855 if (!gone) {
856 switch (ifs->if_type) {
857 case IFT_ETHER:
858 case IFT_L2VLAN:
859 /*
860 * Take the interface out of promiscuous mode.
861 */
862 (void) ifpromisc(ifs, 0);
863 bridge_mutecaps(bif, 0);
864 break;
865
866 case IFT_GIF:
867 break;
868
869 default:
870 #ifdef DIAGNOSTIC
871 panic("bridge_delete_member: impossible");
872 #endif
873 break;
874 }
875 }
876
877 if (bif->bif_flags & IFBIF_STP)
878 bstp_disable(&bif->bif_stp);
879
880 ifs->if_bridge = NULL;
881 BRIDGE_XLOCK(sc);
882 LIST_REMOVE(bif, bif_next);
883 BRIDGE_XDROP(sc);
884
885 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
886
887 BRIDGE_UNLOCK(sc);
888 bstp_destroy(&bif->bif_stp); /* prepare to free */
889 BRIDGE_LOCK(sc);
890 free(bif, M_DEVBUF);
891 }
892
893 /*
894 * bridge_delete_span:
895 *
896 * Delete the specified span interface.
897 */
898 static void
899 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
900 {
901 BRIDGE_LOCK_ASSERT(sc);
902
903 KASSERT(bif->bif_ifp->if_bridge == NULL,
904 ("%s: not a span interface", __func__));
905
906 LIST_REMOVE(bif, bif_next);
907 free(bif, M_DEVBUF);
908 }
909
910 static int
911 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
912 {
913 struct ifbreq *req = arg;
914 struct bridge_iflist *bif = NULL;
915 struct ifnet *ifs;
916 int error = 0;
917
918 ifs = ifunit(req->ifbr_ifsname);
919 if (ifs == NULL)
920 return (ENOENT);
921
922 /* If it's in the span list, it can't be a member. */
923 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
924 if (ifs == bif->bif_ifp)
925 return (EBUSY);
926
927 /* Allow the first Ethernet member to define the MTU */
928 if (ifs->if_type != IFT_GIF) {
929 if (LIST_EMPTY(&sc->sc_iflist))
930 sc->sc_ifp->if_mtu = ifs->if_mtu;
931 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
932 if_printf(sc->sc_ifp, "invalid MTU for %s\n",
933 ifs->if_xname);
934 return (EINVAL);
935 }
936 }
937
938 if (ifs->if_bridge == sc)
939 return (EEXIST);
940
941 if (ifs->if_bridge != NULL)
942 return (EBUSY);
943
944 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
945 if (bif == NULL)
946 return (ENOMEM);
947
948 bif->bif_ifp = ifs;
949 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
950
951 switch (ifs->if_type) {
952 case IFT_ETHER:
953 case IFT_L2VLAN:
954 /*
955 * Place the interface into promiscuous mode.
956 */
957 error = ifpromisc(ifs, 1);
958 if (error)
959 goto out;
960
961 bridge_mutecaps(bif, 1);
962 break;
963
964 case IFT_GIF:
965 break;
966
967 default:
968 error = EINVAL;
969 goto out;
970 }
971
972 ifs->if_bridge = sc;
973 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
974 /*
975 * XXX: XLOCK HERE!?!
976 *
977 * NOTE: insert_***HEAD*** should be safe for the traversals.
978 */
979 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
980
981 out:
982 if (error) {
983 if (bif != NULL)
984 free(bif, M_DEVBUF);
985 }
986 return (error);
987 }
988
989 static int
990 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
991 {
992 struct ifbreq *req = arg;
993 struct bridge_iflist *bif;
994
995 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
996 if (bif == NULL)
997 return (ENOENT);
998
999 bridge_delete_member(sc, bif, 0);
1000
1001 return (0);
1002 }
1003
1004 static int
1005 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1006 {
1007 struct ifbreq *req = arg;
1008 struct bridge_iflist *bif;
1009 struct bstp_port *bp;
1010
1011 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1012 if (bif == NULL)
1013 return (ENOENT);
1014
1015 bp = &bif->bif_stp;
1016 req->ifbr_ifsflags = bif->bif_flags;
1017 req->ifbr_state = bp->bp_state;
1018 req->ifbr_priority = bp->bp_priority;
1019 req->ifbr_path_cost = bp->bp_path_cost;
1020 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1021 req->ifbr_proto = bp->bp_protover;
1022 req->ifbr_role = bp->bp_role;
1023 req->ifbr_stpflags = bp->bp_flags;
1024
1025 /* Copy STP state options as flags */
1026 if (bp->bp_operedge)
1027 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1028 if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1029 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1030 if (bp->bp_ptp_link)
1031 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1032 if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1033 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1034 if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1035 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1036 if (bp->bp_flags & BSTP_PORT_ADMCOST)
1037 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1038 return (0);
1039 }
1040
1041 static int
1042 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1043 {
1044 struct ifbreq *req = arg;
1045 struct bridge_iflist *bif;
1046 struct bstp_port *bp;
1047 int error;
1048
1049 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1050 if (bif == NULL)
1051 return (ENOENT);
1052 bp = &bif->bif_stp;
1053
1054 if (req->ifbr_ifsflags & IFBIF_SPAN)
1055 /* SPAN is readonly */
1056 return (EINVAL);
1057
1058 if (req->ifbr_ifsflags & IFBIF_STP) {
1059 if ((bif->bif_flags & IFBIF_STP) == 0) {
1060 error = bstp_enable(&bif->bif_stp);
1061 if (error)
1062 return (error);
1063 }
1064 } else {
1065 if ((bif->bif_flags & IFBIF_STP) != 0)
1066 bstp_disable(&bif->bif_stp);
1067 }
1068
1069 /* Pass on STP flags */
1070 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1071 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1072 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1073 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1074
1075 /* Save the bits relating to the bridge */
1076 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1077
1078 return (0);
1079 }
1080
1081 static int
1082 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1083 {
1084 struct ifbrparam *param = arg;
1085
1086 sc->sc_brtmax = param->ifbrp_csize;
1087 bridge_rttrim(sc);
1088
1089 return (0);
1090 }
1091
1092 static int
1093 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1094 {
1095 struct ifbrparam *param = arg;
1096
1097 param->ifbrp_csize = sc->sc_brtmax;
1098
1099 return (0);
1100 }
1101
1102 static int
1103 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1104 {
1105 struct ifbifconf *bifc = arg;
1106 struct bridge_iflist *bif;
1107 struct ifbreq breq;
1108 char *buf, *outbuf;
1109 int count, buflen, len, error = 0;
1110
1111 count = 0;
1112 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1113 count++;
1114 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1115 count++;
1116
1117 buflen = sizeof(breq) * count;
1118 if (bifc->ifbic_len == 0) {
1119 bifc->ifbic_len = buflen;
1120 return (0);
1121 }
1122 BRIDGE_UNLOCK(sc);
1123 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1124 BRIDGE_LOCK(sc);
1125
1126 count = 0;
1127 buf = outbuf;
1128 len = min(bifc->ifbic_len, buflen);
1129 bzero(&breq, sizeof(breq));
1130 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1131 if (len < sizeof(breq))
1132 break;
1133
1134 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1135 sizeof(breq.ifbr_ifsname));
1136 /* Fill in the ifbreq structure */
1137 error = bridge_ioctl_gifflags(sc, &breq);
1138 if (error)
1139 break;
1140 memcpy(buf, &breq, sizeof(breq));
1141 count++;
1142 buf += sizeof(breq);
1143 len -= sizeof(breq);
1144 }
1145 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1146 if (len < sizeof(breq))
1147 break;
1148
1149 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1150 sizeof(breq.ifbr_ifsname));
1151 breq.ifbr_ifsflags = bif->bif_flags;
1152 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1153 memcpy(buf, &breq, sizeof(breq));
1154 count++;
1155 buf += sizeof(breq);
1156 len -= sizeof(breq);
1157 }
1158
1159 BRIDGE_UNLOCK(sc);
1160 bifc->ifbic_len = sizeof(breq) * count;
1161 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1162 BRIDGE_LOCK(sc);
1163 free(outbuf, M_TEMP);
1164 return (error);
1165 }
1166
1167 static int
1168 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1169 {
1170 struct ifbaconf *bac = arg;
1171 struct bridge_rtnode *brt;
1172 struct ifbareq bareq;
1173 char *buf, *outbuf;
1174 int count, buflen, len, error = 0;
1175
1176 if (bac->ifbac_len == 0)
1177 return (0);
1178
1179 count = 0;
1180 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1181 count++;
1182 buflen = sizeof(bareq) * count;
1183
1184 BRIDGE_UNLOCK(sc);
1185 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1186 BRIDGE_LOCK(sc);
1187
1188 count = 0;
1189 buf = outbuf;
1190 len = min(bac->ifbac_len, buflen);
1191 bzero(&bareq, sizeof(bareq));
1192 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1193 if (len < sizeof(bareq))
1194 goto out;
1195 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1196 sizeof(bareq.ifba_ifsname));
1197 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1198 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1199 time_uptime < brt->brt_expire)
1200 bareq.ifba_expire = brt->brt_expire - time_uptime;
1201 else
1202 bareq.ifba_expire = 0;
1203 bareq.ifba_flags = brt->brt_flags;
1204
1205 memcpy(buf, &bareq, sizeof(bareq));
1206 count++;
1207 buf += sizeof(bareq);
1208 len -= sizeof(bareq);
1209 }
1210 out:
1211 BRIDGE_UNLOCK(sc);
1212 bac->ifbac_len = sizeof(bareq) * count;
1213 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1214 BRIDGE_LOCK(sc);
1215 free(outbuf, M_TEMP);
1216 return (error);
1217 }
1218
1219 static int
1220 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1221 {
1222 struct ifbareq *req = arg;
1223 struct bridge_iflist *bif;
1224 int error;
1225
1226 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1227 if (bif == NULL)
1228 return (ENOENT);
1229
1230 error = bridge_rtupdate(sc, req->ifba_dst, bif, 1,
1231 req->ifba_flags);
1232
1233 return (error);
1234 }
1235
1236 static int
1237 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1238 {
1239 struct ifbrparam *param = arg;
1240
1241 sc->sc_brttimeout = param->ifbrp_ctime;
1242 return (0);
1243 }
1244
1245 static int
1246 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1247 {
1248 struct ifbrparam *param = arg;
1249
1250 param->ifbrp_ctime = sc->sc_brttimeout;
1251 return (0);
1252 }
1253
1254 static int
1255 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1256 {
1257 struct ifbareq *req = arg;
1258
1259 return (bridge_rtdaddr(sc, req->ifba_dst));
1260 }
1261
1262 static int
1263 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1264 {
1265 struct ifbreq *req = arg;
1266
1267 bridge_rtflush(sc, req->ifbr_ifsflags);
1268 return (0);
1269 }
1270
1271 static int
1272 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1273 {
1274 struct ifbrparam *param = arg;
1275 struct bstp_state *bs = &sc->sc_stp;
1276
1277 param->ifbrp_prio = bs->bs_bridge_priority;
1278 return (0);
1279 }
1280
1281 static int
1282 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1283 {
1284 struct ifbrparam *param = arg;
1285
1286 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1287 }
1288
1289 static int
1290 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1291 {
1292 struct ifbrparam *param = arg;
1293 struct bstp_state *bs = &sc->sc_stp;
1294
1295 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1296 return (0);
1297 }
1298
1299 static int
1300 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1301 {
1302 struct ifbrparam *param = arg;
1303
1304 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1305 }
1306
1307 static int
1308 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1309 {
1310 struct ifbrparam *param = arg;
1311 struct bstp_state *bs = &sc->sc_stp;
1312
1313 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1314 return (0);
1315 }
1316
1317 static int
1318 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1319 {
1320 struct ifbrparam *param = arg;
1321
1322 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1323 }
1324
1325 static int
1326 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1327 {
1328 struct ifbrparam *param = arg;
1329 struct bstp_state *bs = &sc->sc_stp;
1330
1331 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1332 return (0);
1333 }
1334
1335 static int
1336 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1337 {
1338 struct ifbrparam *param = arg;
1339
1340 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1341 }
1342
1343 static int
1344 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1345 {
1346 struct ifbreq *req = arg;
1347 struct bridge_iflist *bif;
1348
1349 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1350 if (bif == NULL)
1351 return (ENOENT);
1352
1353 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1354 }
1355
1356 static int
1357 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1358 {
1359 struct ifbreq *req = arg;
1360 struct bridge_iflist *bif;
1361
1362 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1363 if (bif == NULL)
1364 return (ENOENT);
1365
1366 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1367 }
1368
1369 static int
1370 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1371 {
1372 struct ifbreq *req = arg;
1373 struct bridge_iflist *bif = NULL;
1374 struct ifnet *ifs;
1375
1376 ifs = ifunit(req->ifbr_ifsname);
1377 if (ifs == NULL)
1378 return (ENOENT);
1379
1380 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1381 if (ifs == bif->bif_ifp)
1382 return (EBUSY);
1383
1384 if (ifs->if_bridge != NULL)
1385 return (EBUSY);
1386
1387 switch (ifs->if_type) {
1388 case IFT_ETHER:
1389 case IFT_GIF:
1390 case IFT_L2VLAN:
1391 break;
1392 default:
1393 return (EINVAL);
1394 }
1395
1396 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1397 if (bif == NULL)
1398 return (ENOMEM);
1399
1400 bif->bif_ifp = ifs;
1401 bif->bif_flags = IFBIF_SPAN;
1402
1403 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1404
1405 return (0);
1406 }
1407
1408 static int
1409 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1410 {
1411 struct ifbreq *req = arg;
1412 struct bridge_iflist *bif;
1413 struct ifnet *ifs;
1414
1415 ifs = ifunit(req->ifbr_ifsname);
1416 if (ifs == NULL)
1417 return (ENOENT);
1418
1419 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1420 if (ifs == bif->bif_ifp)
1421 break;
1422
1423 if (bif == NULL)
1424 return (ENOENT);
1425
1426 bridge_delete_span(sc, bif);
1427
1428 return (0);
1429 }
1430
1431 static int
1432 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1433 {
1434 struct ifbropreq *req = arg;
1435 struct bstp_state *bs = &sc->sc_stp;
1436 struct bstp_port *root_port;
1437
1438 req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1439 req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1440 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1441
1442 root_port = bs->bs_root_port;
1443 if (root_port == NULL)
1444 req->ifbop_root_port = 0;
1445 else
1446 req->ifbop_root_port = root_port->bp_ifp->if_index;
1447
1448 req->ifbop_holdcount = bs->bs_txholdcount;
1449 req->ifbop_priority = bs->bs_bridge_priority;
1450 req->ifbop_protocol = bs->bs_protover;
1451 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1452 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1453 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1454 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1455 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1456 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1457
1458 return (0);
1459 }
1460
1461 static int
1462 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1463 {
1464 struct ifbrparam *param = arg;
1465
1466 param->ifbrp_cexceeded = sc->sc_brtexceeded;
1467 return (0);
1468 }
1469
1470 static int
1471 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1472 {
1473 struct ifbpstpconf *bifstp = arg;
1474 struct bridge_iflist *bif;
1475 struct bstp_port *bp;
1476 struct ifbpstpreq bpreq;
1477 char *buf, *outbuf;
1478 int count, buflen, len, error = 0;
1479
1480 count = 0;
1481 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1482 if ((bif->bif_flags & IFBIF_STP) != 0)
1483 count++;
1484 }
1485
1486 buflen = sizeof(bpreq) * count;
1487 if (bifstp->ifbpstp_len == 0) {
1488 bifstp->ifbpstp_len = buflen;
1489 return (0);
1490 }
1491
1492 BRIDGE_UNLOCK(sc);
1493 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1494 BRIDGE_LOCK(sc);
1495
1496 count = 0;
1497 buf = outbuf;
1498 len = min(bifstp->ifbpstp_len, buflen);
1499 bzero(&bpreq, sizeof(bpreq));
1500 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1501 if (len < sizeof(bpreq))
1502 break;
1503
1504 if ((bif->bif_flags & IFBIF_STP) == 0)
1505 continue;
1506
1507 bp = &bif->bif_stp;
1508 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1509 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1510 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1511 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1512 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1513 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1514
1515 memcpy(buf, &bpreq, sizeof(bpreq));
1516 count++;
1517 buf += sizeof(bpreq);
1518 len -= sizeof(bpreq);
1519 }
1520
1521 BRIDGE_UNLOCK(sc);
1522 bifstp->ifbpstp_len = sizeof(bpreq) * count;
1523 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1524 BRIDGE_LOCK(sc);
1525 free(outbuf, M_TEMP);
1526 return (error);
1527 }
1528
1529 static int
1530 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1531 {
1532 struct ifbrparam *param = arg;
1533
1534 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1535 }
1536
1537 static int
1538 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1539 {
1540 struct ifbrparam *param = arg;
1541
1542 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1543 }
1544
1545 /*
1546 * bridge_ifdetach:
1547 *
1548 * Detach an interface from a bridge. Called when a member
1549 * interface is detaching.
1550 */
1551 static void
1552 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1553 {
1554 struct bridge_softc *sc = ifp->if_bridge;
1555 struct bridge_iflist *bif;
1556
1557 /* Check if the interface is a bridge member */
1558 if (sc != NULL) {
1559 BRIDGE_LOCK(sc);
1560
1561 bif = bridge_lookup_member_if(sc, ifp);
1562 if (bif != NULL)
1563 bridge_delete_member(sc, bif, 1);
1564
1565 BRIDGE_UNLOCK(sc);
1566 return;
1567 }
1568
1569 /* Check if the interface is a span port */
1570 mtx_lock(&bridge_list_mtx);
1571 LIST_FOREACH(sc, &bridge_list, sc_list) {
1572 BRIDGE_LOCK(sc);
1573 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1574 if (ifp == bif->bif_ifp) {
1575 bridge_delete_span(sc, bif);
1576 break;
1577 }
1578
1579 BRIDGE_UNLOCK(sc);
1580 }
1581 mtx_unlock(&bridge_list_mtx);
1582 }
1583
1584 /*
1585 * bridge_init:
1586 *
1587 * Initialize a bridge interface.
1588 */
1589 static void
1590 bridge_init(void *xsc)
1591 {
1592 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1593 struct ifnet *ifp = sc->sc_ifp;
1594
1595 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1596 return;
1597
1598 BRIDGE_LOCK(sc);
1599 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1600 bridge_timer, sc);
1601
1602 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1603 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */
1604
1605 BRIDGE_UNLOCK(sc);
1606 }
1607
1608 /*
1609 * bridge_stop:
1610 *
1611 * Stop the bridge interface.
1612 */
1613 static void
1614 bridge_stop(struct ifnet *ifp, int disable)
1615 {
1616 struct bridge_softc *sc = ifp->if_softc;
1617
1618 BRIDGE_LOCK_ASSERT(sc);
1619
1620 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1621 return;
1622
1623 callout_stop(&sc->sc_brcallout);
1624 bstp_stop(&sc->sc_stp);
1625
1626 bridge_rtflush(sc, IFBF_FLUSHDYN);
1627
1628 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1629 }
1630
1631 /*
1632 * bridge_enqueue:
1633 *
1634 * Enqueue a packet on a bridge member interface.
1635 *
1636 */
1637 static void
1638 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1639 {
1640 int len, err = 0;
1641 short mflags;
1642 struct mbuf *m0;
1643
1644 len = m->m_pkthdr.len;
1645 mflags = m->m_flags;
1646
1647 /* We may be sending a fragment so traverse the mbuf */
1648 for (; m; m = m0) {
1649 m0 = m->m_nextpkt;
1650 m->m_nextpkt = NULL;
1651
1652 if (err == 0)
1653 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
1654 }
1655
1656 if (err == 0) {
1657
1658 sc->sc_ifp->if_opackets++;
1659 sc->sc_ifp->if_obytes += len;
1660
1661 dst_ifp->if_obytes += len;
1662
1663 if (mflags & M_MCAST) {
1664 sc->sc_ifp->if_omcasts++;
1665 dst_ifp->if_omcasts++;
1666 }
1667 }
1668
1669 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
1670 (*dst_ifp->if_start)(dst_ifp);
1671 }
1672
1673 /*
1674 * bridge_dummynet:
1675 *
1676 * Receive a queued packet from dummynet and pass it on to the output
1677 * interface.
1678 *
1679 * The mbuf has the Ethernet header already attached.
1680 */
1681 static void
1682 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1683 {
1684 struct bridge_softc *sc;
1685
1686 sc = ifp->if_bridge;
1687
1688 /*
1689 * The packet didnt originate from a member interface. This should only
1690 * ever happen if a member interface is removed while packets are
1691 * queued for it.
1692 */
1693 if (sc == NULL) {
1694 m_freem(m);
1695 return;
1696 }
1697
1698 if (inet_pfil_hook.ph_busy_count >= 0
1699 #ifdef INET6
1700 || inet6_pfil_hook.ph_busy_count >= 0
1701 #endif
1702 ) {
1703 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1704 return;
1705 if (m == NULL)
1706 return;
1707 }
1708
1709 bridge_enqueue(sc, ifp, m);
1710 }
1711
1712 /*
1713 * bridge_output:
1714 *
1715 * Send output from a bridge member interface. This
1716 * performs the bridging function for locally originated
1717 * packets.
1718 *
1719 * The mbuf has the Ethernet header already attached. We must
1720 * enqueue or free the mbuf before returning.
1721 */
1722 static int
1723 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1724 struct rtentry *rt)
1725 {
1726 struct ether_header *eh;
1727 struct ifnet *dst_if;
1728 struct bridge_softc *sc;
1729
1730 if (m->m_len < ETHER_HDR_LEN) {
1731 m = m_pullup(m, ETHER_HDR_LEN);
1732 if (m == NULL)
1733 return (0);
1734 }
1735
1736 eh = mtod(m, struct ether_header *);
1737 sc = ifp->if_bridge;
1738
1739 BRIDGE_LOCK(sc);
1740
1741 /*
1742 * If bridge is down, but the original output interface is up,
1743 * go ahead and send out that interface. Otherwise, the packet
1744 * is dropped below.
1745 */
1746 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1747 dst_if = ifp;
1748 goto sendunicast;
1749 }
1750
1751 /*
1752 * If the packet is a multicast, or we don't know a better way to
1753 * get there, send to all interfaces.
1754 */
1755 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1756 dst_if = NULL;
1757 else
1758 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1759 if (dst_if == NULL) {
1760 struct bridge_iflist *bif;
1761 struct mbuf *mc;
1762 int error = 0, used = 0;
1763
1764 bridge_span(sc, m);
1765
1766 BRIDGE_LOCK2REF(sc, error);
1767 if (error) {
1768 m_freem(m);
1769 return (0);
1770 }
1771
1772 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1773 dst_if = bif->bif_ifp;
1774
1775 if (dst_if->if_type == IFT_GIF)
1776 continue;
1777 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1778 continue;
1779
1780 /*
1781 * If this is not the original output interface,
1782 * and the interface is participating in spanning
1783 * tree, make sure the port is in a state that
1784 * allows forwarding.
1785 */
1786 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1787 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1788 continue;
1789
1790 if (LIST_NEXT(bif, bif_next) == NULL) {
1791 used = 1;
1792 mc = m;
1793 } else {
1794 mc = m_copypacket(m, M_DONTWAIT);
1795 if (mc == NULL) {
1796 sc->sc_ifp->if_oerrors++;
1797 continue;
1798 }
1799 }
1800
1801 bridge_enqueue(sc, dst_if, mc);
1802 }
1803 if (used == 0)
1804 m_freem(m);
1805 BRIDGE_UNREF(sc);
1806 return (0);
1807 }
1808
1809 sendunicast:
1810 /*
1811 * XXX Spanning tree consideration here?
1812 */
1813
1814 bridge_span(sc, m);
1815 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1816 m_freem(m);
1817 BRIDGE_UNLOCK(sc);
1818 return (0);
1819 }
1820
1821 BRIDGE_UNLOCK(sc);
1822 bridge_enqueue(sc, dst_if, m);
1823 return (0);
1824 }
1825
1826 /*
1827 * bridge_start:
1828 *
1829 * Start output on a bridge.
1830 *
1831 */
1832 static void
1833 bridge_start(struct ifnet *ifp)
1834 {
1835 struct bridge_softc *sc;
1836 struct mbuf *m;
1837 struct ether_header *eh;
1838 struct ifnet *dst_if;
1839
1840 sc = ifp->if_softc;
1841
1842 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1843 for (;;) {
1844 IFQ_DEQUEUE(&ifp->if_snd, m);
1845 if (m == 0)
1846 break;
1847 BPF_MTAP(ifp, m);
1848
1849 eh = mtod(m, struct ether_header *);
1850 dst_if = NULL;
1851
1852 BRIDGE_LOCK(sc);
1853 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
1854 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1855 }
1856
1857 if (dst_if == NULL)
1858 bridge_broadcast(sc, ifp, m, 0);
1859 else {
1860 BRIDGE_UNLOCK(sc);
1861 bridge_enqueue(sc, dst_if, m);
1862 }
1863 }
1864 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1865 }
1866
1867 /*
1868 * bridge_forward:
1869 *
1870 * The forwarding function of the bridge.
1871 *
1872 * NOTE: Releases the lock on return.
1873 */
1874 static void
1875 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
1876 struct mbuf *m)
1877 {
1878 struct bridge_iflist *dbif;
1879 struct ifnet *src_if, *dst_if, *ifp;
1880 struct ether_header *eh;
1881
1882 src_if = m->m_pkthdr.rcvif;
1883 ifp = sc->sc_ifp;
1884
1885 sc->sc_ifp->if_ipackets++;
1886 sc->sc_ifp->if_ibytes += m->m_pkthdr.len;
1887
1888 if ((sbif->bif_flags & IFBIF_STP) &&
1889 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
1890 BRIDGE_UNLOCK(sc);
1891 m_freem(m);
1892 return;
1893 }
1894
1895 eh = mtod(m, struct ether_header *);
1896
1897 /*
1898 * If the interface is learning, and the source
1899 * address is valid and not multicast, record
1900 * the address.
1901 */
1902 if ((sbif->bif_flags & IFBIF_LEARNING) != 0 &&
1903 ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
1904 (eh->ether_shost[0] == 0 &&
1905 eh->ether_shost[1] == 0 &&
1906 eh->ether_shost[2] == 0 &&
1907 eh->ether_shost[3] == 0 &&
1908 eh->ether_shost[4] == 0 &&
1909 eh->ether_shost[5] == 0) == 0) {
1910 (void) bridge_rtupdate(sc, eh->ether_shost,
1911 sbif, 0, IFBAF_DYNAMIC);
1912 }
1913
1914 if ((sbif->bif_flags & IFBIF_STP) != 0 &&
1915 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) {
1916 m_freem(m);
1917 BRIDGE_UNLOCK(sc);
1918 return;
1919 }
1920
1921 /*
1922 * At this point, the port either doesn't participate
1923 * in spanning tree or it is in the forwarding state.
1924 */
1925
1926 /*
1927 * If the packet is unicast, destined for someone on
1928 * "this" side of the bridge, drop it.
1929 */
1930 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
1931 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1932 if (src_if == dst_if) {
1933 BRIDGE_UNLOCK(sc);
1934 m_freem(m);
1935 return;
1936 }
1937 } else {
1938 /* ...forward it to all interfaces. */
1939 sc->sc_ifp->if_imcasts++;
1940 dst_if = NULL;
1941 }
1942
1943 /*
1944 * If we have a destination interface which is a member of our bridge,
1945 * OR this is a unicast packet, push it through the bpf(4) machinery.
1946 * For broadcast or multicast packets, don't bother because it will
1947 * be reinjected into ether_input. We do this before we pass the packets
1948 * through the pfil(9) framework, as it is possible that pfil(9) will
1949 * drop the packet, or possibly modify it, making it difficult to debug
1950 * firewall issues on the bridge.
1951 */
1952 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
1953 BPF_MTAP(ifp, m);
1954
1955 /* run the packet filter */
1956 if (inet_pfil_hook.ph_busy_count >= 0
1957 #ifdef INET6
1958 || inet6_pfil_hook.ph_busy_count >= 0
1959 #endif
1960 ) {
1961 BRIDGE_UNLOCK(sc);
1962 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
1963 return;
1964 if (m == NULL)
1965 return;
1966 BRIDGE_LOCK(sc);
1967 }
1968
1969 if (dst_if == NULL) {
1970 bridge_broadcast(sc, src_if, m, 1);
1971 return;
1972 }
1973
1974 /*
1975 * At this point, we're dealing with a unicast frame
1976 * going to a different interface.
1977 */
1978 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1979 BRIDGE_UNLOCK(sc);
1980 m_freem(m);
1981 return;
1982 }
1983 dbif = bridge_lookup_member_if(sc, dst_if);
1984 if (dbif == NULL) {
1985 /* Not a member of the bridge (anymore?) */
1986 BRIDGE_UNLOCK(sc);
1987 m_freem(m);
1988 return;
1989 }
1990
1991 /* Private segments can not talk to each other */
1992 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) {
1993 BRIDGE_UNLOCK(sc);
1994 m_freem(m);
1995 return;
1996 }
1997
1998 if ((dbif->bif_flags & IFBIF_STP) &&
1999 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2000 BRIDGE_UNLOCK(sc);
2001 m_freem(m);
2002 return;
2003 }
2004
2005 BRIDGE_UNLOCK(sc);
2006
2007 if (inet_pfil_hook.ph_busy_count >= 0
2008 #ifdef INET6
2009 || inet6_pfil_hook.ph_busy_count >= 0
2010 #endif
2011 ) {
2012 if (bridge_pfil(&m, sc->sc_ifp, dst_if, PFIL_OUT) != 0)
2013 return;
2014 if (m == NULL)
2015 return;
2016 }
2017
2018 bridge_enqueue(sc, dst_if, m);
2019 }
2020
2021 /*
2022 * bridge_input:
2023 *
2024 * Receive input from a member interface. Queue the packet for
2025 * bridging if it is not for us.
2026 */
2027 static struct mbuf *
2028 bridge_input(struct ifnet *ifp, struct mbuf *m)
2029 {
2030 struct bridge_softc *sc = ifp->if_bridge;
2031 struct bridge_iflist *bif, *bif2;
2032 struct ifnet *bifp;
2033 struct ether_header *eh;
2034 struct mbuf *mc, *mc2;
2035
2036 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2037 return (m);
2038
2039 bifp = sc->sc_ifp;
2040
2041 /*
2042 * Implement support for bridge monitoring. If this flag has been
2043 * set on this interface, discard the packet once we push it through
2044 * the bpf(4) machinery, but before we do, increment the byte and
2045 * packet counters associated with this interface.
2046 */
2047 if ((bifp->if_flags & IFF_MONITOR) != 0) {
2048 m->m_pkthdr.rcvif = bifp;
2049 BPF_MTAP(bifp, m);
2050 bifp->if_ipackets++;
2051 bifp->if_ibytes += m->m_pkthdr.len;
2052 m_freem(m);
2053 return (NULL);
2054 }
2055 BRIDGE_LOCK(sc);
2056 bif = bridge_lookup_member_if(sc, ifp);
2057 if (bif == NULL) {
2058 BRIDGE_UNLOCK(sc);
2059 return (m);
2060 }
2061
2062 eh = mtod(m, struct ether_header *);
2063
2064 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp),
2065 ETHER_ADDR_LEN) == 0) {
2066 /* Block redundant paths to us */
2067 if ((bif->bif_flags & IFBIF_STP) &&
2068 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2069 BRIDGE_UNLOCK(sc);
2070 return (m);
2071 }
2072
2073 /*
2074 * Filter on the physical interface.
2075 */
2076 if (pfil_local_phys && (inet_pfil_hook.ph_busy_count >= 0
2077 #ifdef INET6
2078 || inet6_pfil_hook.ph_busy_count >= 0
2079 #endif
2080 )) {
2081 if (bridge_pfil(&m, NULL, ifp, PFIL_IN) != 0 ||
2082 m == NULL) {
2083 BRIDGE_UNLOCK(sc);
2084 return (NULL);
2085 }
2086 }
2087
2088 /*
2089 * If the packet is for us, set the packets source as the
2090 * bridge, and return the packet back to ether_input for
2091 * local processing.
2092 */
2093
2094 /* Note where to send the reply to */
2095 if (bif->bif_flags & IFBIF_LEARNING)
2096 (void) bridge_rtupdate(sc,
2097 eh->ether_shost, bif, 0, IFBAF_DYNAMIC);
2098
2099 /* Mark the packet as arriving on the bridge interface */
2100 m->m_pkthdr.rcvif = bifp;
2101 BPF_MTAP(bifp, m);
2102 bifp->if_ipackets++;
2103
2104 BRIDGE_UNLOCK(sc);
2105 return (m);
2106 }
2107
2108 bridge_span(sc, m);
2109
2110 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
2111 /* Tap off 802.1D packets; they do not get forwarded. */
2112 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2113 ETHER_ADDR_LEN) == 0) {
2114 m = bstp_input(&bif->bif_stp, ifp, m);
2115 if (m == NULL) {
2116 BRIDGE_UNLOCK(sc);
2117 return (NULL);
2118 }
2119 }
2120
2121 if ((bif->bif_flags & IFBIF_STP) &&
2122 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2123 BRIDGE_UNLOCK(sc);
2124 return (m);
2125 }
2126
2127 if (bcmp(etherbroadcastaddr, eh->ether_dhost,
2128 sizeof(etherbroadcastaddr)) == 0)
2129 m->m_flags |= M_BCAST;
2130 else
2131 m->m_flags |= M_MCAST;
2132
2133 /*
2134 * Make a deep copy of the packet and enqueue the copy
2135 * for bridge processing; return the original packet for
2136 * local processing.
2137 */
2138 mc = m_dup(m, M_DONTWAIT);
2139 if (mc == NULL) {
2140 BRIDGE_UNLOCK(sc);
2141 return (m);
2142 }
2143
2144 /* Perform the bridge forwarding function with the copy. */
2145 bridge_forward(sc, bif, mc);
2146
2147 /*
2148 * Reinject the mbuf as arriving on the bridge so we have a
2149 * chance at claiming multicast packets. We can not loop back
2150 * here from ether_input as a bridge is never a member of a
2151 * bridge.
2152 */
2153 KASSERT(bifp->if_bridge == NULL,
2154 ("loop created in bridge_input"));
2155 mc2 = m_dup(m, M_DONTWAIT);
2156 if (mc2 != NULL) {
2157 /* Keep the layer3 header aligned */
2158 int i = min(mc2->m_pkthdr.len, max_protohdr);
2159 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2160 }
2161 if (mc2 != NULL) {
2162 mc2->m_pkthdr.rcvif = bifp;
2163 (*bifp->if_input)(bifp, mc2);
2164 }
2165
2166 /* Return the original packet for local processing. */
2167 return (m);
2168 }
2169
2170 if ((bif->bif_flags & IFBIF_STP) &&
2171 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2172 BRIDGE_UNLOCK(sc);
2173 return (m);
2174 }
2175
2176 #ifdef DEV_CARP
2177 # define OR_CARP_CHECK_WE_ARE_DST(iface) \
2178 || ((iface)->if_carp \
2179 && carp_forus((iface)->if_carp, eh->ether_dhost))
2180 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2181 || ((iface)->if_carp \
2182 && carp_forus((iface)->if_carp, eh->ether_shost))
2183 #else
2184 # define OR_CARP_CHECK_WE_ARE_DST(iface)
2185 # define OR_CARP_CHECK_WE_ARE_SRC(iface)
2186 #endif
2187
2188 #define GRAB_OUR_PACKETS(iface) \
2189 if ((iface)->if_type == IFT_GIF) \
2190 continue; \
2191 /* It is destined for us. */ \
2192 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
2193 OR_CARP_CHECK_WE_ARE_DST((iface)) \
2194 ) { \
2195 if (bif->bif_flags & IFBIF_LEARNING) \
2196 (void) bridge_rtupdate(sc, \
2197 eh->ether_shost, bif, 0, IFBAF_DYNAMIC); \
2198 m->m_pkthdr.rcvif = iface; \
2199 BRIDGE_UNLOCK(sc); \
2200 return (m); \
2201 } \
2202 \
2203 /* We just received a packet that we sent out. */ \
2204 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2205 OR_CARP_CHECK_WE_ARE_SRC((iface)) \
2206 ) { \
2207 BRIDGE_UNLOCK(sc); \
2208 m_freem(m); \
2209 return (NULL); \
2210 }
2211
2212 /*
2213 * Unicast. Make sure it's not for us.
2214 *
2215 * Give a chance for ifp at first priority. This will help when the
2216 * packet comes through the interface like VLAN's with the same MACs
2217 * on several interfaces from the same bridge. This also will save
2218 * some CPU cycles in case the destination interface and the input
2219 * interface (eq ifp) are the same.
2220 */
2221 do { GRAB_OUR_PACKETS(ifp) } while (0);
2222
2223 /* Now check the all bridge members. */
2224 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2225 GRAB_OUR_PACKETS(bif2->bif_ifp)
2226 }
2227
2228 #undef OR_CARP_CHECK_WE_ARE_DST
2229 #undef OR_CARP_CHECK_WE_ARE_SRC
2230 #undef GRAB_OUR_PACKETS
2231
2232 /* Perform the bridge forwarding function. */
2233 bridge_forward(sc, bif, m);
2234
2235 return (NULL);
2236 }
2237
2238 /*
2239 * bridge_broadcast:
2240 *
2241 * Send a frame to all interfaces that are members of
2242 * the bridge, except for the one on which the packet
2243 * arrived.
2244 *
2245 * NOTE: Releases the lock on return.
2246 */
2247 static void
2248 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2249 struct mbuf *m, int runfilt)
2250 {
2251 struct bridge_iflist *dbif, *sbif;
2252 struct mbuf *mc;
2253 struct ifnet *dst_if;
2254 int error = 0, used = 0, i;
2255
2256 sbif = bridge_lookup_member_if(sc, src_if);
2257
2258 BRIDGE_LOCK2REF(sc, error);
2259 if (error) {
2260 m_freem(m);
2261 return;
2262 }
2263
2264 /* Filter on the bridge interface before broadcasting */
2265 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0
2266 #ifdef INET6
2267 || inet6_pfil_hook.ph_busy_count >= 0
2268 #endif
2269 )) {
2270 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2271 goto out;
2272 if (m == NULL)
2273 goto out;
2274 }
2275
2276 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2277 dst_if = dbif->bif_ifp;
2278 if (dst_if == src_if)
2279 continue;
2280
2281 /* Private segments can not talk to each other */
2282 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2283 continue;
2284
2285 if ((dbif->bif_flags & IFBIF_STP) &&
2286 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2287 continue;
2288
2289 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2290 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2291 continue;
2292
2293 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2294 continue;
2295
2296 if (LIST_NEXT(dbif, bif_next) == NULL) {
2297 mc = m;
2298 used = 1;
2299 } else {
2300 mc = m_dup(m, M_DONTWAIT);
2301 if (mc == NULL) {
2302 sc->sc_ifp->if_oerrors++;
2303 continue;
2304 }
2305 }
2306
2307 /*
2308 * Filter on the output interface. Pass a NULL bridge interface
2309 * pointer so we do not redundantly filter on the bridge for
2310 * each interface we broadcast on.
2311 */
2312 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0
2313 #ifdef INET6
2314 || inet6_pfil_hook.ph_busy_count >= 0
2315 #endif
2316 )) {
2317 if (used == 0) {
2318 /* Keep the layer3 header aligned */
2319 i = min(mc->m_pkthdr.len, max_protohdr);
2320 mc = m_copyup(mc, i, ETHER_ALIGN);
2321 if (mc == NULL) {
2322 sc->sc_ifp->if_oerrors++;
2323 continue;
2324 }
2325 }
2326 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2327 continue;
2328 if (mc == NULL)
2329 continue;
2330 }
2331
2332 bridge_enqueue(sc, dst_if, mc);
2333 }
2334 if (used == 0)
2335 m_freem(m);
2336
2337 out:
2338 BRIDGE_UNREF(sc);
2339 }
2340
2341 /*
2342 * bridge_span:
2343 *
2344 * Duplicate a packet out one or more interfaces that are in span mode,
2345 * the original mbuf is unmodified.
2346 */
2347 static void
2348 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2349 {
2350 struct bridge_iflist *bif;
2351 struct ifnet *dst_if;
2352 struct mbuf *mc;
2353
2354 if (LIST_EMPTY(&sc->sc_spanlist))
2355 return;
2356
2357 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2358 dst_if = bif->bif_ifp;
2359
2360 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2361 continue;
2362
2363 mc = m_copypacket(m, M_DONTWAIT);
2364 if (mc == NULL) {
2365 sc->sc_ifp->if_oerrors++;
2366 continue;
2367 }
2368
2369 bridge_enqueue(sc, dst_if, mc);
2370 }
2371 }
2372
2373 /*
2374 * bridge_rtupdate:
2375 *
2376 * Add a bridge routing entry.
2377 */
2378 static int
2379 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
2380 struct bridge_iflist *bif, int setflags, uint8_t flags)
2381 {
2382 struct bridge_rtnode *brt;
2383 struct ifnet *dst_if = bif->bif_ifp;
2384 int error;
2385
2386 BRIDGE_LOCK_ASSERT(sc);
2387
2388 /*
2389 * A route for this destination might already exist. If so,
2390 * update it, otherwise create a new one.
2391 */
2392 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) {
2393 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2394 sc->sc_brtexceeded++;
2395 return (ENOSPC);
2396 }
2397
2398 /*
2399 * Allocate a new bridge forwarding node, and
2400 * initialize the expiration time and Ethernet
2401 * address.
2402 */
2403 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2404 if (brt == NULL)
2405 return (ENOMEM);
2406
2407 if (bif->bif_flags & IFBIF_STICKY)
2408 brt->brt_flags = IFBAF_STICKY;
2409 else
2410 brt->brt_flags = IFBAF_DYNAMIC;
2411
2412 brt->brt_ifp = dst_if;
2413 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2414
2415 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2416 uma_zfree(bridge_rtnode_zone, brt);
2417 return (error);
2418 }
2419 }
2420
2421 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2422 brt->brt_ifp = dst_if;
2423 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2424 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2425 if (setflags)
2426 brt->brt_flags = flags;
2427
2428 return (0);
2429 }
2430
2431 /*
2432 * bridge_rtlookup:
2433 *
2434 * Lookup the destination interface for an address.
2435 */
2436 static struct ifnet *
2437 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr)
2438 {
2439 struct bridge_rtnode *brt;
2440
2441 BRIDGE_LOCK_ASSERT(sc);
2442
2443 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
2444 return (NULL);
2445
2446 return (brt->brt_ifp);
2447 }
2448
2449 /*
2450 * bridge_rttrim:
2451 *
2452 * Trim the routine table so that we have a number
2453 * of routing entries less than or equal to the
2454 * maximum number.
2455 */
2456 static void
2457 bridge_rttrim(struct bridge_softc *sc)
2458 {
2459 struct bridge_rtnode *brt, *nbrt;
2460
2461 BRIDGE_LOCK_ASSERT(sc);
2462
2463 /* Make sure we actually need to do this. */
2464 if (sc->sc_brtcnt <= sc->sc_brtmax)
2465 return;
2466
2467 /* Force an aging cycle; this might trim enough addresses. */
2468 bridge_rtage(sc);
2469 if (sc->sc_brtcnt <= sc->sc_brtmax)
2470 return;
2471
2472 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2473 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2474 bridge_rtnode_destroy(sc, brt);
2475 if (sc->sc_brtcnt <= sc->sc_brtmax)
2476 return;
2477 }
2478 }
2479 }
2480
2481 /*
2482 * bridge_timer:
2483 *
2484 * Aging timer for the bridge.
2485 */
2486 static void
2487 bridge_timer(void *arg)
2488 {
2489 struct bridge_softc *sc = arg;
2490
2491 BRIDGE_LOCK_ASSERT(sc);
2492
2493 bridge_rtage(sc);
2494
2495 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2496 callout_reset(&sc->sc_brcallout,
2497 bridge_rtable_prune_period * hz, bridge_timer, sc);
2498 }
2499
2500 /*
2501 * bridge_rtage:
2502 *
2503 * Perform an aging cycle.
2504 */
2505 static void
2506 bridge_rtage(struct bridge_softc *sc)
2507 {
2508 struct bridge_rtnode *brt, *nbrt;
2509
2510 BRIDGE_LOCK_ASSERT(sc);
2511
2512 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2513 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2514 if (time_uptime >= brt->brt_expire)
2515 bridge_rtnode_destroy(sc, brt);
2516 }
2517 }
2518 }
2519
2520 /*
2521 * bridge_rtflush:
2522 *
2523 * Remove all dynamic addresses from the bridge.
2524 */
2525 static void
2526 bridge_rtflush(struct bridge_softc *sc, int full)
2527 {
2528 struct bridge_rtnode *brt, *nbrt;
2529
2530 BRIDGE_LOCK_ASSERT(sc);
2531
2532 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2533 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2534 bridge_rtnode_destroy(sc, brt);
2535 }
2536 }
2537
2538 /*
2539 * bridge_rtdaddr:
2540 *
2541 * Remove an address from the table.
2542 */
2543 static int
2544 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr)
2545 {
2546 struct bridge_rtnode *brt;
2547
2548 BRIDGE_LOCK_ASSERT(sc);
2549
2550 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
2551 return (ENOENT);
2552
2553 bridge_rtnode_destroy(sc, brt);
2554 return (0);
2555 }
2556
2557 /*
2558 * bridge_rtdelete:
2559 *
2560 * Delete routes to a speicifc member interface.
2561 */
2562 static void
2563 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2564 {
2565 struct bridge_rtnode *brt, *nbrt;
2566
2567 BRIDGE_LOCK_ASSERT(sc);
2568
2569 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2570 if (brt->brt_ifp == ifp && (full ||
2571 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2572 bridge_rtnode_destroy(sc, brt);
2573 }
2574 }
2575
2576 /*
2577 * bridge_rtable_init:
2578 *
2579 * Initialize the route table for this bridge.
2580 */
2581 static int
2582 bridge_rtable_init(struct bridge_softc *sc)
2583 {
2584 int i;
2585
2586 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2587 M_DEVBUF, M_NOWAIT);
2588 if (sc->sc_rthash == NULL)
2589 return (ENOMEM);
2590
2591 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2592 LIST_INIT(&sc->sc_rthash[i]);
2593
2594 sc->sc_rthash_key = arc4random();
2595
2596 LIST_INIT(&sc->sc_rtlist);
2597
2598 return (0);
2599 }
2600
2601 /*
2602 * bridge_rtable_fini:
2603 *
2604 * Deconstruct the route table for this bridge.
2605 */
2606 static void
2607 bridge_rtable_fini(struct bridge_softc *sc)
2608 {
2609
2610 free(sc->sc_rthash, M_DEVBUF);
2611 }
2612
2613 /*
2614 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2615 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2616 */
2617 #define mix(a, b, c) \
2618 do { \
2619 a -= b; a -= c; a ^= (c >> 13); \
2620 b -= c; b -= a; b ^= (a << 8); \
2621 c -= a; c -= b; c ^= (b >> 13); \
2622 a -= b; a -= c; a ^= (c >> 12); \
2623 b -= c; b -= a; b ^= (a << 16); \
2624 c -= a; c -= b; c ^= (b >> 5); \
2625 a -= b; a -= c; a ^= (c >> 3); \
2626 b -= c; b -= a; b ^= (a << 10); \
2627 c -= a; c -= b; c ^= (b >> 15); \
2628 } while (/*CONSTCOND*/0)
2629
2630 static __inline uint32_t
2631 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2632 {
2633 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2634
2635 b += addr[5] << 8;
2636 b += addr[4];
2637 a += addr[3] << 24;
2638 a += addr[2] << 16;
2639 a += addr[1] << 8;
2640 a += addr[0];
2641
2642 mix(a, b, c);
2643
2644 return (c & BRIDGE_RTHASH_MASK);
2645 }
2646
2647 #undef mix
2648
2649 static int
2650 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2651 {
2652 int i, d;
2653
2654 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2655 d = ((int)a[i]) - ((int)b[i]);
2656 }
2657
2658 return (d);
2659 }
2660
2661 /*
2662 * bridge_rtnode_lookup:
2663 *
2664 * Look up a bridge route node for the specified destination.
2665 */
2666 static struct bridge_rtnode *
2667 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr)
2668 {
2669 struct bridge_rtnode *brt;
2670 uint32_t hash;
2671 int dir;
2672
2673 BRIDGE_LOCK_ASSERT(sc);
2674
2675 hash = bridge_rthash(sc, addr);
2676 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2677 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2678 if (dir == 0)
2679 return (brt);
2680 if (dir > 0)
2681 return (NULL);
2682 }
2683
2684 return (NULL);
2685 }
2686
2687 /*
2688 * bridge_rtnode_insert:
2689 *
2690 * Insert the specified bridge node into the route table. We
2691 * assume the entry is not already in the table.
2692 */
2693 static int
2694 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2695 {
2696 struct bridge_rtnode *lbrt;
2697 uint32_t hash;
2698 int dir;
2699
2700 BRIDGE_LOCK_ASSERT(sc);
2701
2702 hash = bridge_rthash(sc, brt->brt_addr);
2703
2704 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2705 if (lbrt == NULL) {
2706 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2707 goto out;
2708 }
2709
2710 do {
2711 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2712 if (dir == 0)
2713 return (EEXIST);
2714 if (dir > 0) {
2715 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2716 goto out;
2717 }
2718 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2719 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2720 goto out;
2721 }
2722 lbrt = LIST_NEXT(lbrt, brt_hash);
2723 } while (lbrt != NULL);
2724
2725 #ifdef DIAGNOSTIC
2726 panic("bridge_rtnode_insert: impossible");
2727 #endif
2728
2729 out:
2730 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2731 sc->sc_brtcnt++;
2732
2733 return (0);
2734 }
2735
2736 /*
2737 * bridge_rtnode_destroy:
2738 *
2739 * Destroy a bridge rtnode.
2740 */
2741 static void
2742 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2743 {
2744 BRIDGE_LOCK_ASSERT(sc);
2745
2746 LIST_REMOVE(brt, brt_hash);
2747
2748 LIST_REMOVE(brt, brt_list);
2749 sc->sc_brtcnt--;
2750 uma_zfree(bridge_rtnode_zone, brt);
2751 }
2752
2753 /*
2754 * bridge_rtable_expire:
2755 *
2756 * Set the expiry time for all routes on an interface.
2757 */
2758 static void
2759 bridge_rtable_expire(struct ifnet *ifp, int age)
2760 {
2761 struct bridge_softc *sc = ifp->if_bridge;
2762 struct bridge_rtnode *brt;
2763
2764 BRIDGE_LOCK(sc);
2765
2766 /*
2767 * If the age is zero then flush, otherwise set all the expiry times to
2768 * age for the interface
2769 */
2770 if (age == 0)
2771 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2772 else {
2773 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2774 /* Cap the expiry time to 'age' */
2775 if (brt->brt_ifp == ifp &&
2776 brt->brt_expire > time_uptime + age &&
2777 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2778 brt->brt_expire = time_uptime + age;
2779 }
2780 }
2781 BRIDGE_UNLOCK(sc);
2782 }
2783
2784 /*
2785 * bridge_state_change:
2786 *
2787 * Callback from the bridgestp code when a port changes states.
2788 */
2789 static void
2790 bridge_state_change(struct ifnet *ifp, int state)
2791 {
2792 struct bridge_softc *sc = ifp->if_bridge;
2793 static const char *stpstates[] = {
2794 "disabled",
2795 "listening",
2796 "learning",
2797 "forwarding",
2798 "blocking",
2799 "discarding"
2800 };
2801
2802 if (log_stp)
2803 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
2804 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
2805 }
2806
2807 /*
2808 * Send bridge packets through pfil if they are one of the types pfil can deal
2809 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
2810 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2811 * that interface.
2812 */
2813 static int
2814 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2815 {
2816 int snap, error, i, hlen;
2817 struct ether_header *eh1, eh2;
2818 struct ip_fw_args args;
2819 struct ip *ip;
2820 struct llc llc1;
2821 u_int16_t ether_type;
2822
2823 snap = 0;
2824 error = -1; /* Default error if not error == 0 */
2825
2826 #if 0
2827 /* we may return with the IP fields swapped, ensure its not shared */
2828 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
2829 #endif
2830
2831 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
2832 return (0); /* filtering is disabled */
2833
2834 i = min((*mp)->m_pkthdr.len, max_protohdr);
2835 if ((*mp)->m_len < i) {
2836 *mp = m_pullup(*mp, i);
2837 if (*mp == NULL) {
2838 printf("%s: m_pullup failed\n", __func__);
2839 return (-1);
2840 }
2841 }
2842
2843 eh1 = mtod(*mp, struct ether_header *);
2844 ether_type = ntohs(eh1->ether_type);
2845
2846 /*
2847 * Check for SNAP/LLC.
2848 */
2849 if (ether_type < ETHERMTU) {
2850 struct llc *llc2 = (struct llc *)(eh1 + 1);
2851
2852 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
2853 llc2->llc_dsap == LLC_SNAP_LSAP &&
2854 llc2->llc_ssap == LLC_SNAP_LSAP &&
2855 llc2->llc_control == LLC_UI) {
2856 ether_type = htons(llc2->llc_un.type_snap.ether_type);
2857 snap = 1;
2858 }
2859 }
2860
2861 /*
2862 * If we're trying to filter bridge traffic, don't look at anything
2863 * other than IP and ARP traffic. If the filter doesn't understand
2864 * IPv6, don't allow IPv6 through the bridge either. This is lame
2865 * since if we really wanted, say, an AppleTalk filter, we are hosed,
2866 * but of course we don't have an AppleTalk filter to begin with.
2867 * (Note that since pfil doesn't understand ARP it will pass *ALL*
2868 * ARP traffic.)
2869 */
2870 switch (ether_type) {
2871 case ETHERTYPE_ARP:
2872 case ETHERTYPE_REVARP:
2873 if (pfil_ipfw_arp == 0)
2874 return (0); /* Automatically pass */
2875 break;
2876
2877 case ETHERTYPE_IP:
2878 #ifdef INET6
2879 case ETHERTYPE_IPV6:
2880 #endif /* INET6 */
2881 break;
2882 default:
2883 /*
2884 * Check to see if the user wants to pass non-ip
2885 * packets, these will not be checked by pfil(9) and
2886 * passed unconditionally so the default is to drop.
2887 */
2888 if (pfil_onlyip)
2889 goto bad;
2890 }
2891
2892 /* Strip off the Ethernet header and keep a copy. */
2893 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
2894 m_adj(*mp, ETHER_HDR_LEN);
2895
2896 /* Strip off snap header, if present */
2897 if (snap) {
2898 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
2899 m_adj(*mp, sizeof(struct llc));
2900 }
2901
2902 /*
2903 * Check the IP header for alignment and errors
2904 */
2905 if (dir == PFIL_IN) {
2906 switch (ether_type) {
2907 case ETHERTYPE_IP:
2908 error = bridge_ip_checkbasic(mp);
2909 break;
2910 #ifdef INET6
2911 case ETHERTYPE_IPV6:
2912 error = bridge_ip6_checkbasic(mp);
2913 break;
2914 #endif /* INET6 */
2915 default:
2916 error = 0;
2917 }
2918 if (error)
2919 goto bad;
2920 }
2921
2922 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) {
2923 error = -1;
2924 args.rule = ip_dn_claim_rule(*mp);
2925 if (args.rule != NULL && fw_one_pass)
2926 goto ipfwpass; /* packet already partially processed */
2927
2928 args.m = *mp;
2929 args.oif = ifp;
2930 args.next_hop = NULL;
2931 args.eh = &eh2;
2932 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
2933 i = ip_fw_chk_ptr(&args);
2934 *mp = args.m;
2935
2936 if (*mp == NULL)
2937 return (error);
2938
2939 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
2940
2941 /* put the Ethernet header back on */
2942 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
2943 if (*mp == NULL)
2944 return (error);
2945 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
2946
2947 /*
2948 * Pass the pkt to dummynet, which consumes it. The
2949 * packet will return to us via bridge_dummynet().
2950 */
2951 args.oif = ifp;
2952 ip_dn_io_ptr(*mp, DN_TO_IFB_FWD, &args);
2953 return (error);
2954 }
2955
2956 if (i != IP_FW_PASS) /* drop */
2957 goto bad;
2958 }
2959
2960 ipfwpass:
2961 error = 0;
2962
2963 /*
2964 * Run the packet through pfil
2965 */
2966 switch (ether_type) {
2967 case ETHERTYPE_IP:
2968 /*
2969 * before calling the firewall, swap fields the same as
2970 * IP does. here we assume the header is contiguous
2971 */
2972 ip = mtod(*mp, struct ip *);
2973
2974 ip->ip_len = ntohs(ip->ip_len);
2975 ip->ip_off = ntohs(ip->ip_off);
2976
2977 /*
2978 * Run pfil on the member interface and the bridge, both can
2979 * be skipped by clearing pfil_member or pfil_bridge.
2980 *
2981 * Keep the order:
2982 * in_if -> bridge_if -> out_if
2983 */
2984 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
2985 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
2986 dir, NULL);
2987
2988 if (*mp == NULL || error != 0) /* filter may consume */
2989 break;
2990
2991 if (pfil_member && ifp != NULL)
2992 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
2993 dir, NULL);
2994
2995 if (*mp == NULL || error != 0) /* filter may consume */
2996 break;
2997
2998 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
2999 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
3000 dir, NULL);
3001
3002 if (*mp == NULL || error != 0) /* filter may consume */
3003 break;
3004
3005 /* check if we need to fragment the packet */
3006 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3007 i = (*mp)->m_pkthdr.len;
3008 if (i > ifp->if_mtu) {
3009 error = bridge_fragment(ifp, *mp, &eh2, snap,
3010 &llc1);
3011 return (error);
3012 }
3013 }
3014
3015 /* Recalculate the ip checksum and restore byte ordering */
3016 ip = mtod(*mp, struct ip *);
3017 hlen = ip->ip_hl << 2;
3018 if (hlen < sizeof(struct ip))
3019 goto bad;
3020 if (hlen > (*mp)->m_len) {
3021 if ((*mp = m_pullup(*mp, hlen)) == 0)
3022 goto bad;
3023 ip = mtod(*mp, struct ip *);
3024 if (ip == NULL)
3025 goto bad;
3026 }
3027 ip->ip_len = htons(ip->ip_len);
3028 ip->ip_off = htons(ip->ip_off);
3029 ip->ip_sum = 0;
3030 if (hlen == sizeof(struct ip))
3031 ip->ip_sum = in_cksum_hdr(ip);
3032 else
3033 ip->ip_sum = in_cksum(*mp, hlen);
3034
3035 break;
3036 #ifdef INET6
3037 case ETHERTYPE_IPV6:
3038 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3039 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3040 dir, NULL);
3041
3042 if (*mp == NULL || error != 0) /* filter may consume */
3043 break;
3044
3045 if (pfil_member && ifp != NULL)
3046 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
3047 dir, NULL);
3048
3049 if (*mp == NULL || error != 0) /* filter may consume */
3050 break;
3051
3052 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3053 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3054 dir, NULL);
3055 break;
3056 #endif
3057 default:
3058 error = 0;
3059 break;
3060 }
3061
3062 if (*mp == NULL)
3063 return (error);
3064 if (error != 0)
3065 goto bad;
3066
3067 error = -1;
3068
3069 /*
3070 * Finally, put everything back the way it was and return
3071 */
3072 if (snap) {
3073 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
3074 if (*mp == NULL)
3075 return (error);
3076 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3077 }
3078
3079 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3080 if (*mp == NULL)
3081 return (error);
3082 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3083
3084 return (0);
3085
3086 bad:
3087 m_freem(*mp);
3088 *mp = NULL;
3089 return (error);
3090 }
3091
3092 /*
3093 * Perform basic checks on header size since
3094 * pfil assumes ip_input has already processed
3095 * it for it. Cut-and-pasted from ip_input.c.
3096 * Given how simple the IPv6 version is,
3097 * does the IPv4 version really need to be
3098 * this complicated?
3099 *
3100 * XXX Should we update ipstat here, or not?
3101 * XXX Right now we update ipstat but not
3102 * XXX csum_counter.
3103 */
3104 static int
3105 bridge_ip_checkbasic(struct mbuf **mp)
3106 {
3107 struct mbuf *m = *mp;
3108 struct ip *ip;
3109 int len, hlen;
3110 u_short sum;
3111
3112 if (*mp == NULL)
3113 return (-1);
3114
3115 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3116 if ((m = m_copyup(m, sizeof(struct ip),
3117 (max_linkhdr + 3) & ~3)) == NULL) {
3118 /* XXXJRT new stat, please */
3119 ipstat.ips_toosmall++;
3120 goto bad;
3121 }
3122 } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3123 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3124 ipstat.ips_toosmall++;
3125 goto bad;
3126 }
3127 }
3128 ip = mtod(m, struct ip *);
3129 if (ip == NULL) goto bad;
3130
3131 if (ip->ip_v != IPVERSION) {
3132 ipstat.ips_badvers++;
3133 goto bad;
3134 }
3135 hlen = ip->ip_hl << 2;
3136 if (hlen < sizeof(struct ip)) { /* minimum header length */
3137 ipstat.ips_badhlen++;
3138 goto bad;
3139 }
3140 if (hlen > m->m_len) {
3141 if ((m = m_pullup(m, hlen)) == 0) {
3142 ipstat.ips_badhlen++;
3143 goto bad;
3144 }
3145 ip = mtod(m, struct ip *);
3146 if (ip == NULL) goto bad;
3147 }
3148
3149 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3150 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3151 } else {
3152 if (hlen == sizeof(struct ip)) {
3153 sum = in_cksum_hdr(ip);
3154 } else {
3155 sum = in_cksum(m, hlen);
3156 }
3157 }
3158 if (sum) {
3159 ipstat.ips_badsum++;
3160 goto bad;
3161 }
3162
3163 /* Retrieve the packet length. */
3164 len = ntohs(ip->ip_len);
3165
3166 /*
3167 * Check for additional length bogosity
3168 */
3169 if (len < hlen) {
3170 ipstat.ips_badlen++;
3171 goto bad;
3172 }
3173
3174 /*
3175 * Check that the amount of data in the buffers
3176 * is as at least much as the IP header would have us expect.
3177 * Drop packet if shorter than we expect.
3178 */
3179 if (m->m_pkthdr.len < len) {
3180 ipstat.ips_tooshort++;
3181 goto bad;
3182 }
3183
3184 /* Checks out, proceed */
3185 *mp = m;
3186 return (0);
3187
3188 bad:
3189 *mp = m;
3190 return (-1);
3191 }
3192
3193 #ifdef INET6
3194 /*
3195 * Same as above, but for IPv6.
3196 * Cut-and-pasted from ip6_input.c.
3197 * XXX Should we update ip6stat, or not?
3198 */
3199 static int
3200 bridge_ip6_checkbasic(struct mbuf **mp)
3201 {
3202 struct mbuf *m = *mp;
3203 struct ip6_hdr *ip6;
3204
3205 /*
3206 * If the IPv6 header is not aligned, slurp it up into a new
3207 * mbuf with space for link headers, in the event we forward
3208 * it. Otherwise, if it is aligned, make sure the entire base
3209 * IPv6 header is in the first mbuf of the chain.
3210 */
3211 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3212 struct ifnet *inifp = m->m_pkthdr.rcvif;
3213 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3214 (max_linkhdr + 3) & ~3)) == NULL) {
3215 /* XXXJRT new stat, please */
3216 ip6stat.ip6s_toosmall++;
3217 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3218 goto bad;
3219 }
3220 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3221 struct ifnet *inifp = m->m_pkthdr.rcvif;
3222 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3223 ip6stat.ip6s_toosmall++;
3224 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3225 goto bad;
3226 }
3227 }
3228
3229 ip6 = mtod(m, struct ip6_hdr *);
3230
3231 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3232 ip6stat.ip6s_badvers++;
3233 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3234 goto bad;
3235 }
3236
3237 /* Checks out, proceed */
3238 *mp = m;
3239 return (0);
3240
3241 bad:
3242 *mp = m;
3243 return (-1);
3244 }
3245 #endif /* INET6 */
3246
3247 /*
3248 * bridge_fragment:
3249 *
3250 * Return a fragmented mbuf chain.
3251 */
3252 static int
3253 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3254 int snap, struct llc *llc)
3255 {
3256 struct mbuf *m0;
3257 struct ip *ip;
3258 int error = -1;
3259
3260 if (m->m_len < sizeof(struct ip) &&
3261 (m = m_pullup(m, sizeof(struct ip))) == NULL)
3262 goto out;
3263 ip = mtod(m, struct ip *);
3264
3265 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
3266 CSUM_DELAY_IP);
3267 if (error)
3268 goto out;
3269
3270 /* walk the chain and re-add the Ethernet header */
3271 for (m0 = m; m0; m0 = m0->m_nextpkt) {
3272 if (error == 0) {
3273 if (snap) {
3274 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
3275 if (m0 == NULL) {
3276 error = ENOBUFS;
3277 continue;
3278 }
3279 bcopy(llc, mtod(m0, caddr_t),
3280 sizeof(struct llc));
3281 }
3282 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
3283 if (m0 == NULL) {
3284 error = ENOBUFS;
3285 continue;
3286 }
3287 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3288 } else
3289 m_freem(m);
3290 }
3291
3292 if (error == 0)
3293 ipstat.ips_fragmented++;
3294
3295 return (error);
3296
3297 out:
3298 if (m != NULL)
3299 m_freem(m);
3300 return (error);
3301 }
Cache object: f981318fb294bb3c5434e3580dbe797e
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