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- In bridge_enqueue(), dispatch the mbuf to the current cpu's netisr, instead
[dragonfly/vkernel-mp.git] / sys / net / bridge / if_bridge.c
blob96427a57d3a2b85bd860557016e8fe0be16b72e1
1 /*
2 * Copyright 2001 Wasabi Systems, Inc.
3 * All rights reserved.
4 *
5 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed for the NetBSD Project by
18 * Wasabi Systems, Inc.
19 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
20 * or promote products derived from this software without specific prior
21 * written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 /*
37 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
38 * All rights reserved.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by Jason L. Wright
51 * 4. The name of the author may not be used to endorse or promote products
52 * derived from this software without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
55 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
56 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
57 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
58 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
59 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
60 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
62 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
63 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
64 * POSSIBILITY OF SUCH DAMAGE.
65 *
66 * $OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp $
67 * $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $
68 * $FreeBSD: src/sys/net/if_bridge.c,v 1.26 2005/10/13 23:05:55 thompsa Exp $
69 * $DragonFly: src/sys/net/bridge/if_bridge.c,v 1.25 2007/06/16 15:27:27 sephe Exp $
70 */
71
72 /*
73 * Network interface bridge support.
74 *
75 * TODO:
76 *
77 * - Currently only supports Ethernet-like interfaces (Ethernet,
78 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way
79 * to bridge other types of interfaces (FDDI-FDDI, and maybe
80 * consider heterogenous bridges).
81 */
82
83 #include <sys/cdefs.h>
84
85 #include "opt_inet.h"
86 #include "opt_inet6.h"
87
88 #include <sys/param.h>
89 #include <sys/mbuf.h>
90 #include <sys/malloc.h>
91 #include <sys/protosw.h>
92 #include <sys/systm.h>
93 #include <sys/time.h>
94 #include <sys/socket.h> /* for net/if.h */
95 #include <sys/sockio.h>
96 #include <sys/ctype.h> /* string functions */
97 #include <sys/kernel.h>
98 #include <sys/random.h>
99 #include <sys/sysctl.h>
100 #include <sys/module.h>
101 #include <sys/proc.h>
102 #include <sys/lock.h>
103 #include <sys/thread.h>
104 #include <sys/thread2.h>
105 #include <sys/mpipe.h>
106
107 #include <net/bpf.h>
108 #include <net/if.h>
109 #include <net/if_dl.h>
110 #include <net/if_types.h>
111 #include <net/if_var.h>
112 #include <net/pfil.h>
113 #include <net/ifq_var.h>
114
115 #include <netinet/in.h> /* for struct arpcom */
116 #include <netinet/in_systm.h>
117 #include <netinet/in_var.h>
118 #include <netinet/ip.h>
119 #include <netinet/ip_var.h>
120 #ifdef INET6
121 #include <netinet/ip6.h>
122 #include <netinet6/ip6_var.h>
123 #endif
124 #include <netinet/if_ether.h> /* for struct arpcom */
125 #include <net/bridge/if_bridgevar.h>
126 #include <net/if_llc.h>
127 #include <net/netmsg2.h>
128
129 #include <net/route.h>
130 #include <sys/in_cksum.h>
131
132 /*
133 * Size of the route hash table. Must be a power of two.
134 */
135 #ifndef BRIDGE_RTHASH_SIZE
136 #define BRIDGE_RTHASH_SIZE 1024
137 #endif
138
139 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
140
141 /*
142 * Maximum number of addresses to cache.
143 */
144 #ifndef BRIDGE_RTABLE_MAX
145 #define BRIDGE_RTABLE_MAX 100
146 #endif
147
148 /*
149 * Spanning tree defaults.
150 */
151 #define BSTP_DEFAULT_MAX_AGE (20 * 256)
152 #define BSTP_DEFAULT_HELLO_TIME (2 * 256)
153 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256)
154 #define BSTP_DEFAULT_HOLD_TIME (1 * 256)
155 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000
156 #define BSTP_DEFAULT_PORT_PRIORITY 0x80
157 #define BSTP_DEFAULT_PATH_COST 55
158
159 /*
160 * Timeout (in seconds) for entries learned dynamically.
161 */
162 #ifndef BRIDGE_RTABLE_TIMEOUT
163 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
164 #endif
165
166 /*
167 * Number of seconds between walks of the route list.
168 */
169 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
170 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
171 #endif
172
173 /*
174 * List of capabilities to mask on the member interface.
175 */
176 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM
177
178 eventhandler_tag bridge_detach_cookie = NULL;
179
180 extern struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
181 extern int (*bridge_output_p)(struct ifnet *, struct mbuf *,
182 struct sockaddr *, struct rtentry *);
183 extern void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
184
185 static int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
186
187 static int bridge_clone_create(struct if_clone *, int);
188 static void bridge_clone_destroy(struct ifnet *);
189
190 static int bridge_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
191 static void bridge_mutecaps(struct bridge_iflist *, int);
192 static void bridge_ifdetach(void *arg __unused, struct ifnet *);
193 static void bridge_init(void *);
194 static void bridge_stop(struct ifnet *);
195 static void bridge_start(struct ifnet *);
196 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
197 static int bridge_output_serialized(struct ifnet *, struct mbuf *,
198 struct sockaddr *, struct rtentry *);
199
200 static void bridge_forward(struct bridge_softc *, struct mbuf *m);
201
202 static void bridge_timer(void *);
203
204 static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
205 struct mbuf *, int);
206 static void bridge_span(struct bridge_softc *, struct mbuf *);
207
208 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
209 struct ifnet *, int, uint8_t);
210 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *);
211 static void bridge_rttrim(struct bridge_softc *);
212 static void bridge_rtage(struct bridge_softc *);
213 static void bridge_rtflush(struct bridge_softc *, int);
214 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
215
216 static int bridge_rtable_init(struct bridge_softc *);
217 static void bridge_rtable_fini(struct bridge_softc *);
218
219 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
220 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
221 const uint8_t *);
222 static int bridge_rtnode_insert(struct bridge_softc *,
223 struct bridge_rtnode *);
224 static void bridge_rtnode_destroy(struct bridge_softc *,
225 struct bridge_rtnode *);
226
227 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
228 const char *name);
229 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
230 struct ifnet *ifp);
231 static void bridge_delete_member(struct bridge_softc *,
232 struct bridge_iflist *, int);
233 static void bridge_delete_span(struct bridge_softc *,
234 struct bridge_iflist *);
235
236 static int bridge_ioctl_add(struct bridge_softc *, void *);
237 static int bridge_ioctl_del(struct bridge_softc *, void *);
238 static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
239 static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
240 static int bridge_ioctl_scache(struct bridge_softc *, void *);
241 static int bridge_ioctl_gcache(struct bridge_softc *, void *);
242 static int bridge_ioctl_gifs(struct bridge_softc *, void *);
243 static int bridge_ioctl_rts(struct bridge_softc *, void *);
244 static int bridge_ioctl_saddr(struct bridge_softc *, void *);
245 static int bridge_ioctl_sto(struct bridge_softc *, void *);
246 static int bridge_ioctl_gto(struct bridge_softc *, void *);
247 static int bridge_ioctl_daddr(struct bridge_softc *, void *);
248 static int bridge_ioctl_flush(struct bridge_softc *, void *);
249 static int bridge_ioctl_gpri(struct bridge_softc *, void *);
250 static int bridge_ioctl_spri(struct bridge_softc *, void *);
251 static int bridge_ioctl_ght(struct bridge_softc *, void *);
252 static int bridge_ioctl_sht(struct bridge_softc *, void *);
253 static int bridge_ioctl_gfd(struct bridge_softc *, void *);
254 static int bridge_ioctl_sfd(struct bridge_softc *, void *);
255 static int bridge_ioctl_gma(struct bridge_softc *, void *);
256 static int bridge_ioctl_sma(struct bridge_softc *, void *);
257 static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
258 static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
259 static int bridge_ioctl_addspan(struct bridge_softc *, void *);
260 static int bridge_ioctl_delspan(struct bridge_softc *, void *);
261 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
262 int);
263 static int bridge_ip_checkbasic(struct mbuf **mp);
264 #ifdef INET6
265 static int bridge_ip6_checkbasic(struct mbuf **mp);
266 #endif /* INET6 */
267 static int bridge_fragment(struct ifnet *, struct mbuf *,
268 struct ether_header *, int, struct llc *);
269 static void bridge_enqueue_internal(struct ifnet *, struct mbuf *m,
270 netisr_fn_t);
271 static void bridge_enqueue_handler(struct netmsg *);
272 static void bridge_pfil_enqueue_handler(struct netmsg *);
273 static void bridge_pfil_enqueue(struct ifnet *, struct mbuf *, int);
274 static void bridge_handoff_notags(struct ifnet *, struct mbuf *);
275 static void bridge_handoff(struct ifnet *, struct mbuf *);
276
277 SYSCTL_DECL(_net_link);
278 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
279
280 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
281 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
282 static int pfil_member = 1; /* run pfil hooks on the member interface */
283 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
284 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
285 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
286 &pfil_bridge, 0, "Packet filter on the bridge interface");
287 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
288 &pfil_member, 0, "Packet filter on the member interface");
289
290 struct bridge_control {
291 int (*bc_func)(struct bridge_softc *, void *);
292 int bc_argsize;
293 int bc_flags;
294 };
295
296 #define BC_F_COPYIN 0x01 /* copy arguments in */
297 #define BC_F_COPYOUT 0x02 /* copy arguments out */
298 #define BC_F_SUSER 0x04 /* do super-user check */
299
300 const struct bridge_control bridge_control_table[] = {
301 { bridge_ioctl_add, sizeof(struct ifbreq),
302 BC_F_COPYIN|BC_F_SUSER },
303 { bridge_ioctl_del, sizeof(struct ifbreq),
304 BC_F_COPYIN|BC_F_SUSER },
305
306 { bridge_ioctl_gifflags, sizeof(struct ifbreq),
307 BC_F_COPYIN|BC_F_COPYOUT },
308 { bridge_ioctl_sifflags, sizeof(struct ifbreq),
309 BC_F_COPYIN|BC_F_SUSER },
310
311 { bridge_ioctl_scache, sizeof(struct ifbrparam),
312 BC_F_COPYIN|BC_F_SUSER },
313 { bridge_ioctl_gcache, sizeof(struct ifbrparam),
314 BC_F_COPYOUT },
315
316 { bridge_ioctl_gifs, sizeof(struct ifbifconf),
317 BC_F_COPYIN|BC_F_COPYOUT },
318 { bridge_ioctl_rts, sizeof(struct ifbaconf),
319 BC_F_COPYIN|BC_F_COPYOUT },
320
321 { bridge_ioctl_saddr, sizeof(struct ifbareq),
322 BC_F_COPYIN|BC_F_SUSER },
323
324 { bridge_ioctl_sto, sizeof(struct ifbrparam),
325 BC_F_COPYIN|BC_F_SUSER },
326 { bridge_ioctl_gto, sizeof(struct ifbrparam),
327 BC_F_COPYOUT },
328
329 { bridge_ioctl_daddr, sizeof(struct ifbareq),
330 BC_F_COPYIN|BC_F_SUSER },
331
332 { bridge_ioctl_flush, sizeof(struct ifbreq),
333 BC_F_COPYIN|BC_F_SUSER },
334
335 { bridge_ioctl_gpri, sizeof(struct ifbrparam),
336 BC_F_COPYOUT },
337 { bridge_ioctl_spri, sizeof(struct ifbrparam),
338 BC_F_COPYIN|BC_F_SUSER },
339
340 { bridge_ioctl_ght, sizeof(struct ifbrparam),
341 BC_F_COPYOUT },
342 { bridge_ioctl_sht, sizeof(struct ifbrparam),
343 BC_F_COPYIN|BC_F_SUSER },
344
345 { bridge_ioctl_gfd, sizeof(struct ifbrparam),
346 BC_F_COPYOUT },
347 { bridge_ioctl_sfd, sizeof(struct ifbrparam),
348 BC_F_COPYIN|BC_F_SUSER },
349
350 { bridge_ioctl_gma, sizeof(struct ifbrparam),
351 BC_F_COPYOUT },
352 { bridge_ioctl_sma, sizeof(struct ifbrparam),
353 BC_F_COPYIN|BC_F_SUSER },
354
355 { bridge_ioctl_sifprio, sizeof(struct ifbreq),
356 BC_F_COPYIN|BC_F_SUSER },
357
358 { bridge_ioctl_sifcost, sizeof(struct ifbreq),
359 BC_F_COPYIN|BC_F_SUSER },
360
361 { bridge_ioctl_addspan, sizeof(struct ifbreq),
362 BC_F_COPYIN|BC_F_SUSER },
363 { bridge_ioctl_delspan, sizeof(struct ifbreq),
364 BC_F_COPYIN|BC_F_SUSER },
365 };
366 const int bridge_control_table_size =
367 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
368
369 LIST_HEAD(, bridge_softc) bridge_list;
370
371 struct if_clone bridge_cloner = IF_CLONE_INITIALIZER("bridge",
372 bridge_clone_create,
373 bridge_clone_destroy, 0, IF_MAXUNIT);
374
375 static int
376 bridge_modevent(module_t mod, int type, void *data)
377 {
378 switch (type) {
379 case MOD_LOAD:
380 LIST_INIT(&bridge_list);
381 if_clone_attach(&bridge_cloner);
382 bridge_input_p = bridge_input;
383 bridge_output_p = bridge_output_serialized;
384 bridge_detach_cookie = EVENTHANDLER_REGISTER(
385 ifnet_detach_event, bridge_ifdetach, NULL,
386 EVENTHANDLER_PRI_ANY);
387 #if notyet
388 bstp_linkstate_p = bstp_linkstate;
389 #endif
390 break;
391 case MOD_UNLOAD:
392 if (!LIST_EMPTY(&bridge_list))
393 return (EBUSY);
394 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
395 bridge_detach_cookie);
396 if_clone_detach(&bridge_cloner);
397 bridge_input_p = NULL;
398 bridge_output_p = NULL;
399 #if notyet
400 bstp_linkstate_p = NULL;
401 #endif
402 break;
403 default:
404 return (EOPNOTSUPP);
405 }
406 return (0);
407 }
408
409 static moduledata_t bridge_mod = {
410 "if_bridge",
411 bridge_modevent,
412 0
413 };
414
415 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
416
417
418 /*
419 * bridge_clone_create:
420 *
421 * Create a new bridge instance.
422 */
423 static int
424 bridge_clone_create(struct if_clone *ifc, int unit)
425 {
426 struct bridge_softc *sc;
427 struct ifnet *ifp;
428 u_char eaddr[6];
429
430 sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
431 ifp = sc->sc_ifp = &sc->sc_if;
432
433 sc->sc_brtmax = BRIDGE_RTABLE_MAX;
434 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
435 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
436 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME;
437 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY;
438 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
439 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME;
440
441 /* Initialize our routing table. */
442 bridge_rtable_init(sc);
443
444 callout_init(&sc->sc_brcallout);
445 callout_init(&sc->sc_bstpcallout);
446
447 LIST_INIT(&sc->sc_iflist);
448 LIST_INIT(&sc->sc_spanlist);
449
450 ifp->if_softc = sc;
451 if_initname(ifp, ifc->ifc_name, unit);
452 ifp->if_mtu = ETHERMTU;
453 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST;
454 ifp->if_ioctl = bridge_ioctl;
455 ifp->if_start = bridge_start;
456 ifp->if_init = bridge_init;
457 ifp->if_type = IFT_BRIDGE;
458 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
459 ifp->if_snd.ifq_maxlen = ifqmaxlen;
460 ifq_set_ready(&ifp->if_snd);
461 ifp->if_hdrlen = ETHER_HDR_LEN;
462
463 /*
464 * Generate a random ethernet address and use the private AC:DE:48
465 * OUI code.
466 */
467 {
468 int rnd = karc4random();
469 bcopy(&rnd, &eaddr[0], 4); /* ETHER_ADDR_LEN == 6 */
470 rnd = karc4random();
471 bcopy(&rnd, &eaddr[2], 4); /* ETHER_ADDR_LEN == 6 */
472 }
473 eaddr[0] &= ~1; /* clear multicast bit */
474 eaddr[0] |= 2; /* set the LAA bit */
475
476 ether_ifattach(ifp, eaddr, NULL);
477 /* Now undo some of the damage... */
478 ifp->if_baudrate = 0;
479 ifp->if_type = IFT_BRIDGE;
480
481 crit_enter();
482 LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
483 crit_exit();
484
485 return (0);
486 }
487
488 /*
489 * bridge_clone_destroy:
490 *
491 * Destroy a bridge instance.
492 */
493 static void
494 bridge_clone_destroy(struct ifnet *ifp)
495 {
496 struct bridge_softc *sc = ifp->if_softc;
497 struct bridge_iflist *bif;
498
499 lwkt_serialize_enter(ifp->if_serializer);
500
501 bridge_stop(ifp);
502 ifp->if_flags &= ~IFF_UP;
503
504 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
505 bridge_delete_member(sc, bif, 0);
506
507 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
508 bridge_delete_span(sc, bif);
509 }
510
511 callout_stop(&sc->sc_brcallout);
512 callout_stop(&sc->sc_bstpcallout);
513
514 lwkt_serialize_exit(ifp->if_serializer);
515
516 crit_enter();
517 LIST_REMOVE(sc, sc_list);
518 crit_exit();
519
520 ether_ifdetach(ifp);
521
522 /* Tear down the routing table. */
523 bridge_rtable_fini(sc);
524
525 kfree(sc, M_DEVBUF);
526 }
527
528 /*
529 * bridge_ioctl:
530 *
531 * Handle a control request from the operator.
532 */
533 static int
534 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
535 {
536 struct bridge_softc *sc = ifp->if_softc;
537 union {
538 struct ifbreq ifbreq;
539 struct ifbifconf ifbifconf;
540 struct ifbareq ifbareq;
541 struct ifbaconf ifbaconf;
542 struct ifbrparam ifbrparam;
543 } args;
544 struct ifdrv *ifd = (struct ifdrv *) data;
545 const struct bridge_control *bc;
546 int error = 0;
547
548 ASSERT_SERIALIZED(ifp->if_serializer);
549
550 switch (cmd) {
551 case SIOCADDMULTI:
552 case SIOCDELMULTI:
553 break;
554
555 case SIOCGDRVSPEC:
556 case SIOCSDRVSPEC:
557 if (ifd->ifd_cmd >= bridge_control_table_size) {
558 error = EINVAL;
559 break;
560 }
561 bc = &bridge_control_table[ifd->ifd_cmd];
562
563 if (cmd == SIOCGDRVSPEC &&
564 (bc->bc_flags & BC_F_COPYOUT) == 0) {
565 error = EINVAL;
566 break;
567 } else if (cmd == SIOCSDRVSPEC &&
568 (bc->bc_flags & BC_F_COPYOUT) != 0) {
569 error = EINVAL;
570 break;
571 }
572
573 if (bc->bc_flags & BC_F_SUSER) {
574 error = suser_cred(cr, NULL_CRED_OKAY);
575 if (error)
576 break;
577 }
578
579 if (ifd->ifd_len != bc->bc_argsize ||
580 ifd->ifd_len > sizeof(args)) {
581 error = EINVAL;
582 break;
583 }
584
585 memset(&args, 0, sizeof(args));
586 if (bc->bc_flags & BC_F_COPYIN) {
587 error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
588 if (error)
589 break;
590 }
591
592 error = bc->bc_func(sc, &args);
593 if (error)
594 break;
595
596 if (bc->bc_flags & BC_F_COPYOUT)
597 error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
598 break;
599
600 case SIOCSIFFLAGS:
601 if (!(ifp->if_flags & IFF_UP) &&
602 (ifp->if_flags & IFF_RUNNING)) {
603 /*
604 * If interface is marked down and it is running,
605 * then stop it.
606 */
607 bridge_stop(ifp);
608 } else if ((ifp->if_flags & IFF_UP) &&
609 !(ifp->if_flags & IFF_RUNNING)) {
610 /*
611 * If interface is marked up and it is stopped, then
612 * start it.
613 */
614 ifp->if_init(sc);
615 }
616 break;
617
618 case SIOCSIFMTU:
619 /* Do not allow the MTU to be changed on the bridge */
620 error = EINVAL;
621 break;
622
623 default:
624 error = ether_ioctl(ifp, cmd, data);
625 break;
626 }
627 return (error);
628 }
629
630 /*
631 * bridge_mutecaps:
632 *
633 * Clear or restore unwanted capabilities on the member interface
634 */
635 static void
636 bridge_mutecaps(struct bridge_iflist *bif, int mute)
637 {
638 struct ifnet *ifp = bif->bif_ifp;
639 struct ifreq ifr;
640 int error;
641
642 if (ifp->if_ioctl == NULL)
643 return;
644
645 bzero(&ifr, sizeof(ifr));
646 ifr.ifr_reqcap = ifp->if_capenable;
647
648 if (mute) {
649 /* mask off and save capabilities */
650 bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK;
651 if (bif->bif_mutecap != 0)
652 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK;
653 } else
654 /* restore muted capabilities */
655 ifr.ifr_reqcap |= bif->bif_mutecap;
656
657 if (bif->bif_mutecap != 0) {
658 lwkt_serialize_enter(ifp->if_serializer);
659 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr, NULL);
660 lwkt_serialize_exit(ifp->if_serializer);
661 }
662 }
663
664 /*
665 * bridge_lookup_member:
666 *
667 * Lookup a bridge member interface.
668 */
669 static struct bridge_iflist *
670 bridge_lookup_member(struct bridge_softc *sc, const char *name)
671 {
672 struct bridge_iflist *bif;
673 struct ifnet *ifp;
674
675 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
676 ifp = bif->bif_ifp;
677 if (strcmp(ifp->if_xname, name) == 0)
678 return (bif);
679 }
680
681 return (NULL);
682 }
683
684 /*
685 * bridge_lookup_member_if:
686 *
687 * Lookup a bridge member interface by ifnet*.
688 */
689 static struct bridge_iflist *
690 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
691 {
692 struct bridge_iflist *bif;
693
694 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
695 if (bif->bif_ifp == member_ifp)
696 return (bif);
697 }
698
699 return (NULL);
700 }
701
702 /*
703 * bridge_delete_member:
704 *
705 * Delete the specified member interface.
706 */
707 static void
708 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
709 int gone)
710 {
711 struct ifnet *ifs = bif->bif_ifp;
712
713 if (!gone) {
714 switch (ifs->if_type) {
715 case IFT_ETHER:
716 case IFT_L2VLAN:
717 /*
718 * Take the interface out of promiscuous mode.
719 */
720 (void) ifpromisc(ifs, 0);
721 bridge_mutecaps(bif, 0);
722 break;
723
724 case IFT_GIF:
725 break;
726
727 default:
728 #ifdef DIAGNOSTIC
729 panic("bridge_delete_member: impossible");
730 #endif
731 break;
732 }
733 }
734
735 ifs->if_bridge = NULL;
736 LIST_REMOVE(bif, bif_next);
737
738 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
739
740 kfree(bif, M_DEVBUF);
741
742 if (sc->sc_ifp->if_flags & IFF_RUNNING)
743 bstp_initialization(sc);
744 }
745
746 /*
747 * bridge_delete_span:
748 *
749 * Delete the specified span interface.
750 */
751 static void
752 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
753 {
754 KASSERT(bif->bif_ifp->if_bridge == NULL,
755 ("%s: not a span interface", __func__));
756
757 LIST_REMOVE(bif, bif_next);
758 kfree(bif, M_DEVBUF);
759 }
760
761 static int
762 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
763 {
764 struct ifbreq *req = arg;
765 struct bridge_iflist *bif = NULL;
766 struct ifnet *ifs;
767 int error = 0;
768
769 ifs = ifunit(req->ifbr_ifsname);
770 if (ifs == NULL)
771 return (ENOENT);
772
773 /* If it's in the span list, it can't be a member. */
774 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
775 if (ifs == bif->bif_ifp)
776 return (EBUSY);
777
778 /* Allow the first Ethernet member to define the MTU */
779 if (ifs->if_type != IFT_GIF) {
780 if (LIST_EMPTY(&sc->sc_iflist))
781 sc->sc_ifp->if_mtu = ifs->if_mtu;
782 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
783 if_printf(sc->sc_ifp, "invalid MTU for %s\n",
784 ifs->if_xname);
785 return (EINVAL);
786 }
787 }
788
789 if (ifs->if_bridge == sc)
790 return (EEXIST);
791
792 if (ifs->if_bridge != NULL)
793 return (EBUSY);
794
795 bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK|M_ZERO);
796 bif->bif_ifp = ifs;
797 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
798 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY;
799 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST;
800
801 switch (ifs->if_type) {
802 case IFT_ETHER:
803 case IFT_L2VLAN:
804 /*
805 * Place the interface into promiscuous mode.
806 */
807 error = ifpromisc(ifs, 1);
808 if (error)
809 goto out;
810
811 bridge_mutecaps(bif, 1);
812 break;
813
814 case IFT_GIF: /* :^) */
815 break;
816
817 default:
818 error = EINVAL;
819 goto out;
820 }
821
822 ifs->if_bridge = sc;
823
824 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
825
826 if (sc->sc_ifp->if_flags & IFF_RUNNING)
827 bstp_initialization(sc);
828 else
829 bstp_stop(sc);
830
831 out:
832 if (error) {
833 if (bif != NULL)
834 kfree(bif, M_DEVBUF);
835 }
836 return (error);
837 }
838
839 static int
840 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
841 {
842 struct ifbreq *req = arg;
843 struct bridge_iflist *bif;
844
845 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
846 if (bif == NULL)
847 return (ENOENT);
848
849 bridge_delete_member(sc, bif, 0);
850
851 return (0);
852 }
853
854 static int
855 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
856 {
857 struct ifbreq *req = arg;
858 struct bridge_iflist *bif;
859
860 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
861 if (bif == NULL)
862 return (ENOENT);
863
864 req->ifbr_ifsflags = bif->bif_flags;
865 req->ifbr_state = bif->bif_state;
866 req->ifbr_priority = bif->bif_priority;
867 req->ifbr_path_cost = bif->bif_path_cost;
868 req->ifbr_portno = bif->bif_ifp->if_index & 0xff;
869
870 return (0);
871 }
872
873 static int
874 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
875 {
876 struct ifbreq *req = arg;
877 struct bridge_iflist *bif;
878
879 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
880 if (bif == NULL)
881 return (ENOENT);
882
883 if (req->ifbr_ifsflags & IFBIF_SPAN)
884 /* SPAN is readonly */
885 return (EINVAL);
886
887 if (req->ifbr_ifsflags & IFBIF_STP) {
888 switch (bif->bif_ifp->if_type) {
889 case IFT_ETHER:
890 /* These can do spanning tree. */
891 break;
892
893 default:
894 /* Nothing else can. */
895 return (EINVAL);
896 }
897 }
898
899 bif->bif_flags = req->ifbr_ifsflags;
900
901 if (sc->sc_ifp->if_flags & IFF_RUNNING)
902 bstp_initialization(sc);
903
904 return (0);
905 }
906
907 static int
908 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
909 {
910 struct ifbrparam *param = arg;
911
912 sc->sc_brtmax = param->ifbrp_csize;
913 bridge_rttrim(sc);
914
915 return (0);
916 }
917
918 static int
919 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
920 {
921 struct ifbrparam *param = arg;
922
923 param->ifbrp_csize = sc->sc_brtmax;
924
925 return (0);
926 }
927
928 static int
929 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
930 {
931 struct ifbifconf *bifc = arg;
932 struct bridge_iflist *bif;
933 struct ifbreq breq;
934 int count, len, error = 0;
935
936 count = 0;
937 LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
938 count++;
939 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
940 count++;
941
942 if (bifc->ifbic_len == 0) {
943 bifc->ifbic_len = sizeof(breq) * count;
944 return (0);
945 }
946
947 count = 0;
948 len = bifc->ifbic_len;
949 memset(&breq, 0, sizeof breq);
950 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
951 if (len < sizeof(breq))
952 break;
953
954 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
955 sizeof(breq.ifbr_ifsname));
956 breq.ifbr_ifsflags = bif->bif_flags;
957 breq.ifbr_state = bif->bif_state;
958 breq.ifbr_priority = bif->bif_priority;
959 breq.ifbr_path_cost = bif->bif_path_cost;
960 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
961 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
962 if (error)
963 break;
964 count++;
965 len -= sizeof(breq);
966 }
967 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
968 if (len < sizeof(breq))
969 break;
970
971 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
972 sizeof(breq.ifbr_ifsname));
973 breq.ifbr_ifsflags = bif->bif_flags;
974 breq.ifbr_state = bif->bif_state;
975 breq.ifbr_priority = bif->bif_priority;
976 breq.ifbr_path_cost = bif->bif_path_cost;
977 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
978 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
979 if (error)
980 break;
981 count++;
982 len -= sizeof(breq);
983 }
984
985 bifc->ifbic_len = sizeof(breq) * count;
986 return (error);
987 }
988
989 static int
990 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
991 {
992 struct ifbaconf *bac = arg;
993 struct bridge_rtnode *brt;
994 struct ifbareq bareq;
995 int count = 0, error = 0, len;
996
997 if (bac->ifbac_len == 0)
998 return (0);
999
1000 len = bac->ifbac_len;
1001 memset(&bareq, 0, sizeof(bareq));
1002 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1003 if (len < sizeof(bareq))
1004 goto out;
1005 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1006 sizeof(bareq.ifba_ifsname));
1007 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1008 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1009 time_second < brt->brt_expire)
1010 bareq.ifba_expire = brt->brt_expire - time_second;
1011 else
1012 bareq.ifba_expire = 0;
1013 bareq.ifba_flags = brt->brt_flags;
1014
1015 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq));
1016 if (error)
1017 goto out;
1018 count++;
1019 len -= sizeof(bareq);
1020 }
1021 out:
1022 bac->ifbac_len = sizeof(bareq) * count;
1023 return (error);
1024 }
1025
1026 static int
1027 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1028 {
1029 struct ifbareq *req = arg;
1030 struct bridge_iflist *bif;
1031 int error;
1032
1033 bif = bridge_lookup_member(sc, req->ifba_ifsname);
1034 if (bif == NULL)
1035 return (ENOENT);
1036
1037 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1,
1038 req->ifba_flags);
1039
1040 return (error);
1041 }
1042
1043 static int
1044 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1045 {
1046 struct ifbrparam *param = arg;
1047
1048 sc->sc_brttimeout = param->ifbrp_ctime;
1049
1050 return (0);
1051 }
1052
1053 static int
1054 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1055 {
1056 struct ifbrparam *param = arg;
1057
1058 param->ifbrp_ctime = sc->sc_brttimeout;
1059
1060 return (0);
1061 }
1062
1063 static int
1064 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1065 {
1066 struct ifbareq *req = arg;
1067
1068 return (bridge_rtdaddr(sc, req->ifba_dst));
1069 }
1070
1071 static int
1072 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1073 {
1074 struct ifbreq *req = arg;
1075
1076 bridge_rtflush(sc, req->ifbr_ifsflags);
1077
1078 return (0);
1079 }
1080
1081 static int
1082 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1083 {
1084 struct ifbrparam *param = arg;
1085
1086 param->ifbrp_prio = sc->sc_bridge_priority;
1087
1088 return (0);
1089 }
1090
1091 static int
1092 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1093 {
1094 struct ifbrparam *param = arg;
1095
1096 sc->sc_bridge_priority = param->ifbrp_prio;
1097
1098 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1099 bstp_initialization(sc);
1100
1101 return (0);
1102 }
1103
1104 static int
1105 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1106 {
1107 struct ifbrparam *param = arg;
1108
1109 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8;
1110
1111 return (0);
1112 }
1113
1114 static int
1115 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1116 {
1117 struct ifbrparam *param = arg;
1118
1119 if (param->ifbrp_hellotime == 0)
1120 return (EINVAL);
1121 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8;
1122
1123 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1124 bstp_initialization(sc);
1125
1126 return (0);
1127 }
1128
1129 static int
1130 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1131 {
1132 struct ifbrparam *param = arg;
1133
1134 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8;
1135
1136 return (0);
1137 }
1138
1139 static int
1140 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1141 {
1142 struct ifbrparam *param = arg;
1143
1144 if (param->ifbrp_fwddelay == 0)
1145 return (EINVAL);
1146 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8;
1147
1148 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1149 bstp_initialization(sc);
1150
1151 return (0);
1152 }
1153
1154 static int
1155 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1156 {
1157 struct ifbrparam *param = arg;
1158
1159 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8;
1160
1161 return (0);
1162 }
1163
1164 static int
1165 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1166 {
1167 struct ifbrparam *param = arg;
1168
1169 if (param->ifbrp_maxage == 0)
1170 return (EINVAL);
1171 sc->sc_bridge_max_age = param->ifbrp_maxage << 8;
1172
1173 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1174 bstp_initialization(sc);
1175
1176 return (0);
1177 }
1178
1179 static int
1180 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1181 {
1182 struct ifbreq *req = arg;
1183 struct bridge_iflist *bif;
1184
1185 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1186 if (bif == NULL)
1187 return (ENOENT);
1188
1189 bif->bif_priority = req->ifbr_priority;
1190
1191 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1192 bstp_initialization(sc);
1193
1194 return (0);
1195 }
1196
1197 static int
1198 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1199 {
1200 struct ifbreq *req = arg;
1201 struct bridge_iflist *bif;
1202
1203 bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1204 if (bif == NULL)
1205 return (ENOENT);
1206
1207 bif->bif_path_cost = req->ifbr_path_cost;
1208
1209 if (sc->sc_ifp->if_flags & IFF_RUNNING)
1210 bstp_initialization(sc);
1211
1212 return (0);
1213 }
1214
1215 static int
1216 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1217 {
1218 struct ifbreq *req = arg;
1219 struct bridge_iflist *bif = NULL;
1220 struct ifnet *ifs;
1221
1222 ifs = ifunit(req->ifbr_ifsname);
1223 if (ifs == NULL)
1224 return (ENOENT);
1225
1226 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1227 if (ifs == bif->bif_ifp)
1228 return (EBUSY);
1229
1230 if (ifs->if_bridge != NULL)
1231 return (EBUSY);
1232
1233 switch (ifs->if_type) {
1234 case IFT_ETHER:
1235 case IFT_GIF:
1236 case IFT_L2VLAN:
1237 break;
1238 default:
1239 return (EINVAL);
1240 }
1241
1242 bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK|M_ZERO);
1243 if (bif == NULL)
1244 return (ENOMEM);
1245
1246 bif->bif_ifp = ifs;
1247 bif->bif_flags = IFBIF_SPAN;
1248
1249 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1250
1251 return (0);
1252 }
1253
1254 static int
1255 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1256 {
1257 struct ifbreq *req = arg;
1258 struct bridge_iflist *bif;
1259 struct ifnet *ifs;
1260
1261 ifs = ifunit(req->ifbr_ifsname);
1262 if (ifs == NULL)
1263 return (ENOENT);
1264
1265 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1266 if (ifs == bif->bif_ifp)
1267 break;
1268
1269 if (bif == NULL)
1270 return (ENOENT);
1271
1272 bridge_delete_span(sc, bif);
1273
1274 return (0);
1275 }
1276
1277 /*
1278 * bridge_ifdetach:
1279 *
1280 * Detach an interface from a bridge. Called when a member
1281 * interface is detaching.
1282 */
1283 static void
1284 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1285 {
1286 struct bridge_softc *sc = ifp->if_bridge;
1287 struct bridge_iflist *bif;
1288
1289 /* Check if the interface is a bridge member */
1290 if (sc != NULL) {
1291 lwkt_serialize_enter(ifp->if_serializer);
1292
1293 bif = bridge_lookup_member_if(sc, ifp);
1294 if (bif != NULL)
1295 bridge_delete_member(sc, bif, 1);
1296
1297 lwkt_serialize_exit(ifp->if_serializer);
1298 return;
1299 }
1300
1301 /* Check if the interface is a span port */
1302 LIST_FOREACH(sc, &bridge_list, sc_list) {
1303 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1304 if (ifp == bif->bif_ifp) {
1305 bridge_delete_span(sc, bif);
1306 break;
1307 }
1308 }
1309 }
1310
1311 /*
1312 * bridge_init:
1313 *
1314 * Initialize a bridge interface.
1315 */
1316 static void
1317 bridge_init(void *xsc)
1318 {
1319 struct bridge_softc *sc = (struct bridge_softc *)xsc;
1320 struct ifnet *ifp = sc->sc_ifp;
1321
1322 ASSERT_SERIALIZED(ifp->if_serializer);
1323
1324 if (ifp->if_flags & IFF_RUNNING)
1325 return;
1326
1327 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1328 bridge_timer, sc);
1329
1330 ifp->if_flags |= IFF_RUNNING;
1331 bstp_initialization(sc);
1332 return;
1333 }
1334
1335 /*
1336 * bridge_stop:
1337 *
1338 * Stop the bridge interface.
1339 */
1340 static void
1341 bridge_stop(struct ifnet *ifp)
1342 {
1343 struct bridge_softc *sc = ifp->if_softc;
1344
1345 ASSERT_SERIALIZED(ifp->if_serializer);
1346
1347 if ((ifp->if_flags & IFF_RUNNING) == 0)
1348 return;
1349
1350 callout_stop(&sc->sc_brcallout);
1351 bstp_stop(sc);
1352
1353 bridge_rtflush(sc, IFBF_FLUSHDYN);
1354
1355 ifp->if_flags &= ~IFF_RUNNING;
1356 }
1357
1358 static void
1359 bridge_enqueue_internal(struct ifnet *dst_ifp, struct mbuf *m,
1360 netisr_fn_t handler)
1361 {
1362 struct netmsg_packet *nmp;
1363 lwkt_port_t port;
1364 int cpu = mycpu->gd_cpuid;
1365
1366 while (m->m_type == MT_TAG) {
1367 /* XXX see ether_output_frame for full rules check */
1368 m = m->m_next;
1369 }
1370
1371 nmp = &m->m_hdr.mh_netmsg;
1372 netmsg_init(&nmp->nm_netmsg, &netisr_apanic_rport, 0, handler);
1373 nmp->nm_packet = m;
1374 nmp->nm_netmsg.nm_lmsg.u.ms_resultp = dst_ifp;
1375
1376 port = cpu_portfn(cpu);
1377 lwkt_sendmsg(port, &nmp->nm_netmsg.nm_lmsg);
1378 }
1379
1380 static void
1381 bridge_pfil_enqueue(struct ifnet *dst_ifp, struct mbuf *m,
1382 int runfilt)
1383 {
1384 netisr_fn_t handler;
1385
1386 if (runfilt && (inet_pfil_hook.ph_hashooks > 0
1387 #ifdef INET6
1388 || inet6_pfil_hook.ph_hashooks > 0
1389 #endif
1390 )) {
1391 handler = bridge_pfil_enqueue_handler;
1392 } else {
1393 handler = bridge_enqueue_handler;
1394 }
1395 bridge_enqueue_internal(dst_ifp, m, handler);
1396 }
1397
1398 /*
1399 * bridge_enqueue:
1400 *
1401 * Enqueue a packet on a bridge member interface.
1402 *
1403 */
1404 void
1405 bridge_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
1406 {
1407 bridge_enqueue_internal(dst_ifp, m, bridge_enqueue_handler);
1408 }
1409
1410 /*
1411 * bridge_output_serialized:
1412 *
1413 * Send output from a bridge member interface. This
1414 * performs the bridging function for locally originated
1415 * packets.
1416 *
1417 * The mbuf has the Ethernet header already attached. We must
1418 * enqueue or free the mbuf before returning.
1419 */
1420 static int
1421 bridge_output_serialized(struct ifnet *ifp, struct mbuf *m,
1422 struct sockaddr *sa, struct rtentry *rt)
1423 {
1424 struct ether_header *eh;
1425 struct ifnet *dst_if;
1426 struct bridge_softc *sc;
1427
1428 sc = ifp->if_bridge;
1429
1430 ASSERT_SERIALIZED(ifp->if_serializer);
1431
1432 if (m->m_len < ETHER_HDR_LEN) {
1433 m = m_pullup(m, ETHER_HDR_LEN);
1434 if (m == NULL)
1435 return (0);
1436 }
1437
1438 /*
1439 * Serialize our bridge interface. We have to get rid of the
1440 * originating interface lock to avoid a deadlock.
1441 */
1442 lwkt_serialize_exit(ifp->if_serializer);
1443 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1444
1445 eh = mtod(m, struct ether_header *);
1446
1447 /*
1448 * If bridge is down, but the original output interface is up,
1449 * go ahead and send out that interface. Otherwise, the packet
1450 * is dropped below.
1451 */
1452 if ((sc->sc_ifp->if_flags & IFF_RUNNING) == 0) {
1453 dst_if = ifp;
1454 goto sendunicast;
1455 }
1456
1457 /*
1458 * If the packet is a multicast, or we don't know a better way to
1459 * get there, send to all interfaces.
1460 */
1461 if (ETHER_IS_MULTICAST(eh->ether_dhost))
1462 dst_if = NULL;
1463 else
1464 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1465 if (dst_if == NULL) {
1466 struct bridge_iflist *bif;
1467 struct mbuf *mc;
1468 int used = 0;
1469
1470 bridge_span(sc, m);
1471
1472 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1473 dst_if = bif->bif_ifp;
1474 if ((dst_if->if_flags & IFF_RUNNING) == 0)
1475 continue;
1476
1477 /*
1478 * If this is not the original output interface,
1479 * and the interface is participating in spanning
1480 * tree, make sure the port is in a state that
1481 * allows forwarding.
1482 */
1483 if (dst_if != ifp &&
1484 (bif->bif_flags & IFBIF_STP) != 0) {
1485 switch (bif->bif_state) {
1486 case BSTP_IFSTATE_BLOCKING:
1487 case BSTP_IFSTATE_LISTENING:
1488 case BSTP_IFSTATE_DISABLED:
1489 continue;
1490 }
1491 }
1492
1493 if (LIST_NEXT(bif, bif_next) == NULL) {
1494 used = 1;
1495 mc = m;
1496 } else {
1497 mc = m_copypacket(m, MB_DONTWAIT);
1498 if (mc == NULL) {
1499 sc->sc_ifp->if_oerrors++;
1500 continue;
1501 }
1502 }
1503 bridge_enqueue(dst_if, mc);
1504 }
1505 if (used == 0)
1506 m_freem(m);
1507 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1508 goto done;
1509 }
1510
1511 sendunicast:
1512 /*
1513 * XXX Spanning tree consideration here?
1514 */
1515
1516 bridge_span(sc, m);
1517 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1518 if ((dst_if->if_flags & IFF_RUNNING) == 0) {
1519 m_freem(m);
1520 } else {
1521 bridge_enqueue(dst_if, m);
1522 }
1523 done:
1524 lwkt_serialize_enter(ifp->if_serializer);
1525 return (0);
1526 }
1527
1528 /*
1529 * bridge_start:
1530 *
1531 * Start output on a bridge.
1532 *
1533 */
1534 static void
1535 bridge_start(struct ifnet *ifp)
1536 {
1537 struct bridge_softc *sc = ifp->if_softc;
1538
1539 ASSERT_SERIALIZED(ifp->if_serializer);
1540
1541 ifp->if_flags |= IFF_OACTIVE;
1542 for (;;) {
1543 struct ifnet *dst_if = NULL;
1544 struct ether_header *eh;
1545 struct mbuf *m;
1546
1547 m = ifq_dequeue(&ifp->if_snd, NULL);
1548 if (m == NULL)
1549 break;
1550
1551 if (m->m_len < sizeof(*eh)) {
1552 m = m_pullup(m, sizeof(*eh));
1553 if (m == NULL) {
1554 ifp->if_oerrors++;
1555 continue;
1556 }
1557 }
1558 eh = mtod(m, struct ether_header *);
1559
1560 BPF_MTAP(ifp, m);
1561 ifp->if_opackets++;
1562
1563 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0)
1564 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1565
1566 if (dst_if == NULL)
1567 bridge_broadcast(sc, ifp, m, 0);
1568 else
1569 bridge_enqueue(dst_if, m);
1570 }
1571 ifp->if_flags &= ~IFF_OACTIVE;
1572 }
1573
1574 /*
1575 * bridge_forward:
1576 *
1577 * The forwarding function of the bridge.
1578 */
1579 static void
1580 bridge_forward(struct bridge_softc *sc, struct mbuf *m)
1581 {
1582 struct bridge_iflist *bif;
1583 struct ifnet *src_if, *dst_if, *ifp;
1584 struct ether_header *eh;
1585
1586 src_if = m->m_pkthdr.rcvif;
1587 ifp = sc->sc_ifp;
1588
1589 ASSERT_SERIALIZED(ifp->if_serializer);
1590
1591 ifp->if_ipackets++;
1592 ifp->if_ibytes += m->m_pkthdr.len;
1593
1594 /*
1595 * Look up the bridge_iflist.
1596 */
1597 bif = bridge_lookup_member_if(sc, src_if);
1598 if (bif == NULL) {
1599 /* Interface is not a bridge member (anymore?) */
1600 m_freem(m);
1601 return;
1602 }
1603
1604 if (bif->bif_flags & IFBIF_STP) {
1605 switch (bif->bif_state) {
1606 case BSTP_IFSTATE_BLOCKING:
1607 case BSTP_IFSTATE_LISTENING:
1608 case BSTP_IFSTATE_DISABLED:
1609 m_freem(m);
1610 return;
1611 }
1612 }
1613
1614 eh = mtod(m, struct ether_header *);
1615
1616 /*
1617 * If the interface is learning, and the source
1618 * address is valid and not multicast, record
1619 * the address.
1620 */
1621 if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
1622 ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
1623 (eh->ether_shost[0] == 0 &&
1624 eh->ether_shost[1] == 0 &&
1625 eh->ether_shost[2] == 0 &&
1626 eh->ether_shost[3] == 0 &&
1627 eh->ether_shost[4] == 0 &&
1628 eh->ether_shost[5] == 0) == 0) {
1629 bridge_rtupdate(sc, eh->ether_shost, src_if, 0, IFBAF_DYNAMIC);
1630 }
1631
1632 if ((bif->bif_flags & IFBIF_STP) != 0 &&
1633 bif->bif_state == BSTP_IFSTATE_LEARNING) {
1634 m_freem(m);
1635 return;
1636 }
1637
1638 /*
1639 * At this point, the port either doesn't participate
1640 * in spanning tree or it is in the forwarding state.
1641 */
1642
1643 /*
1644 * If the packet is unicast, destined for someone on
1645 * "this" side of the bridge, drop it.
1646 */
1647 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
1648 dst_if = bridge_rtlookup(sc, eh->ether_dhost);
1649 if (src_if == dst_if) {
1650 m_freem(m);
1651 return;
1652 }
1653 } else {
1654 /* ...forward it to all interfaces. */
1655 sc->sc_ifp->if_imcasts++;
1656 dst_if = NULL;
1657 }
1658
1659 if (dst_if == NULL) {
1660 bridge_broadcast(sc, src_if, m, 1);
1661 return;
1662 }
1663
1664 /*
1665 * At this point, we're dealing with a unicast frame
1666 * going to a different interface.
1667 */
1668 if ((dst_if->if_flags & IFF_RUNNING) == 0) {
1669 m_freem(m);
1670 return;
1671 }
1672 bif = bridge_lookup_member_if(sc, dst_if);
1673 if (bif == NULL) {
1674 /* Not a member of the bridge (anymore?) */
1675 m_freem(m);
1676 return;
1677 }
1678
1679 if (bif->bif_flags & IFBIF_STP) {
1680 switch (bif->bif_state) {
1681 case BSTP_IFSTATE_DISABLED:
1682 case BSTP_IFSTATE_BLOCKING:
1683 m_freem(m);
1684 return;
1685 }
1686 }
1687
1688 lwkt_serialize_exit(ifp->if_serializer);
1689
1690 /* run the packet filter */
1691 if (inet_pfil_hook.ph_hashooks > 0
1692 #ifdef INET6
1693 || inet6_pfil_hook.ph_hashooks > 0
1694 #endif
1695 ) {
1696 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
1697 goto done;
1698 if (m == NULL)
1699 goto done;
1700
1701 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
1702 goto done;
1703 if (m == NULL)
1704 goto done;
1705 }
1706 bridge_handoff(dst_if, m);
1707
1708 /*
1709 * ifp's serializer was held on entry and is expected to be held
1710 * on return.
1711 */
1712 done:
1713 lwkt_serialize_enter(ifp->if_serializer);
1714 }
1715
1716 /*
1717 * bridge_input:
1718 *
1719 * Receive input from a member interface. Queue the packet for
1720 * bridging if it is not for us.
1721 */
1722 static struct mbuf *
1723 bridge_input(struct ifnet *ifp, struct mbuf *m)
1724 {
1725 struct bridge_softc *sc = ifp->if_bridge;
1726 struct bridge_iflist *bif;
1727 struct ifnet *bifp, *new_ifp;
1728 struct ether_header *eh;
1729 struct mbuf *mc, *mc2;
1730
1731 new_ifp = NULL;
1732 bifp = sc->sc_ifp;
1733
1734 lwkt_serialize_enter(bifp->if_serializer);
1735
1736 if ((bifp->if_flags & IFF_RUNNING) == 0)
1737 goto out;
1738
1739 /*
1740 * Implement support for bridge monitoring. If this flag has been
1741 * set on this interface, discard the packet once we push it through
1742 * the bpf(4) machinery, but before we do, increment the byte and
1743 * packet counters associated with this interface.
1744 */
1745 if ((bifp->if_flags & IFF_MONITOR) != 0) {
1746 m->m_pkthdr.rcvif = bifp;
1747 BPF_MTAP(bifp, m);
1748 bifp->if_ipackets++;
1749 bifp->if_ibytes += m->m_pkthdr.len;
1750 m_freem(m);
1751 m = NULL;
1752 goto out;
1753 }
1754
1755 eh = mtod(m, struct ether_header *);
1756
1757 m->m_flags &= ~M_PROTO1; /* XXX Hack - loop prevention */
1758
1759 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
1760 /*
1761 * If the packet is for us, set the packets source as the
1762 * bridge, and return the packet back to ifnet.if_input for
1763 * local processing.
1764 */
1765 KASSERT(bifp->if_bridge == NULL,
1766 ("loop created in bridge_input"));
1767 new_ifp = bifp;
1768 goto out;
1769 }
1770
1771 /*
1772 * Tap all packets arriving on the bridge, no matter if
1773 * they are local destinations or not. In is in.
1774 */
1775 BPF_MTAP(bifp, m);
1776
1777 bif = bridge_lookup_member_if(sc, ifp);
1778 if (bif == NULL)
1779 goto out;
1780
1781 bridge_span(sc, m);
1782
1783 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
1784 /* Tap off 802.1D packets; they do not get forwarded. */
1785 if (memcmp(eh->ether_dhost, bstp_etheraddr,
1786 ETHER_ADDR_LEN) == 0) {
1787 m = bstp_input(ifp, m);
1788 KASSERT(m == NULL,
1789 ("attempt to deliver 802.1D packet\n"));
1790 goto out;
1791 }
1792
1793 if (bif->bif_flags & IFBIF_STP) {
1794 switch (bif->bif_state) {
1795 case BSTP_IFSTATE_BLOCKING:
1796 case BSTP_IFSTATE_LISTENING:
1797 case BSTP_IFSTATE_DISABLED:
1798 goto out;
1799 }
1800 }
1801
1802 if (bcmp(etherbroadcastaddr, eh->ether_dhost,
1803 sizeof(etherbroadcastaddr)) == 0)
1804 m->m_flags |= M_BCAST;
1805 else
1806 m->m_flags |= M_MCAST;
1807
1808 /*
1809 * Make a deep copy of the packet and enqueue the copy
1810 * for bridge processing; return the original packet for
1811 * local processing.
1812 */
1813 mc = m_dup(m, MB_DONTWAIT);
1814 if (mc == NULL)
1815 goto out;
1816
1817 bridge_forward(sc, mc);
1818
1819 /*
1820 * Reinject the mbuf as arriving on the bridge so we have a
1821 * chance at claiming multicast packets. We can not loop back
1822 * here from ether_input as a bridge is never a member of a
1823 * bridge.
1824 */
1825 KASSERT(bifp->if_bridge == NULL,
1826 ("loop created in bridge_input"));
1827 mc2 = m_dup(m, MB_DONTWAIT);
1828 #ifdef notyet
1829 if (mc2 != NULL) {
1830 /* Keep the layer3 header aligned */
1831 int i = min(mc2->m_pkthdr.len, max_protohdr);
1832 mc2 = m_copyup(mc2, i, ETHER_ALIGN);
1833 }
1834 #endif
1835 if (mc2 != NULL) {
1836 mc2->m_pkthdr.rcvif = bifp;
1837 bifp->if_ipackets++;
1838 bifp->if_input(bifp, mc2);
1839 }
1840
1841 /* Return the original packet for local processing. */
1842 goto out;
1843 }
1844
1845 if (bif->bif_flags & IFBIF_STP) {
1846 switch (bif->bif_state) {
1847 case BSTP_IFSTATE_BLOCKING:
1848 case BSTP_IFSTATE_LISTENING:
1849 case BSTP_IFSTATE_DISABLED:
1850 goto out;
1851 }
1852 }
1853
1854 /*
1855 * Unicast. Make sure it's not for us.
1856 */
1857 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1858 if (bif->bif_ifp->if_type != IFT_ETHER)
1859 continue;
1860
1861 /* It is destined for us. */
1862 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost,
1863 ETHER_ADDR_LEN) == 0) {
1864 if (bif->bif_flags & IFBIF_LEARNING) {
1865 bridge_rtupdate(sc,
1866 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC);
1867 }
1868
1869 if (bif->bif_ifp != ifp) {
1870 /* XXX loop prevention */
1871 m->m_flags |= M_PROTO1;
1872 new_ifp = bif->bif_ifp;
1873 }
1874 goto out;
1875 }
1876
1877 /* We just received a packet that we sent out. */
1878 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost,
1879 ETHER_ADDR_LEN) == 0) {
1880 m_freem(m);
1881 m = NULL;
1882 goto out;
1883 }
1884 }
1885
1886 /* Perform the bridge forwarding function. */
1887 bridge_forward(sc, m);
1888 m = NULL;
1889 out:
1890 lwkt_serialize_exit(bifp->if_serializer);
1891
1892 if (new_ifp != NULL) {
1893 lwkt_serialize_enter(new_ifp->if_serializer);
1894
1895 m->m_pkthdr.rcvif = new_ifp;
1896 new_ifp->if_ipackets++;
1897 new_ifp->if_input(new_ifp, m);
1898 m = NULL;
1899
1900 lwkt_serialize_exit(new_ifp->if_serializer);
1901 }
1902 return (m);
1903 }
1904
1905 /*
1906 * bridge_broadcast:
1907 *
1908 * Send a frame to all interfaces that are members of
1909 * the bridge, except for the one on which the packet
1910 * arrived.
1911 */
1912 static void
1913 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
1914 struct mbuf *m, int runfilt)
1915 {
1916 struct bridge_iflist *bif;
1917 struct mbuf *mc;
1918 struct ifnet *dst_if, *bifp;
1919 int used = 0;
1920
1921 bifp = sc->sc_ifp;
1922
1923 ASSERT_SERIALIZED(bifp->if_serializer);
1924
1925 /* run the packet filter */
1926 if (runfilt && (inet_pfil_hook.ph_hashooks > 0
1927 #ifdef INET6
1928 || inet6_pfil_hook.ph_hashooks > 0
1929 #endif
1930 )) {
1931 lwkt_serialize_exit(bifp->if_serializer);
1932
1933 /* Filter on the bridge interface before broadcasting */
1934
1935 if (bridge_pfil(&m, bifp, src_if, PFIL_IN) != 0)
1936 goto filt;
1937 if (m == NULL)
1938 goto filt;
1939
1940 if (bridge_pfil(&m, bifp, NULL, PFIL_OUT) != 0)
1941 m = NULL;
1942 filt:
1943 lwkt_serialize_enter(bifp->if_serializer);
1944 if (m == NULL)
1945 return;
1946 }
1947
1948 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1949 dst_if = bif->bif_ifp;
1950 if (dst_if == src_if)
1951 continue;
1952
1953 if (bif->bif_flags & IFBIF_STP) {
1954 switch (bif->bif_state) {
1955 case BSTP_IFSTATE_BLOCKING:
1956 case BSTP_IFSTATE_DISABLED:
1957 continue;
1958 }
1959 }
1960
1961 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 &&
1962 (m->m_flags & (M_BCAST|M_MCAST)) == 0)
1963 continue;
1964
1965 if ((dst_if->if_flags & IFF_RUNNING) == 0)
1966 continue;
1967
1968 if (LIST_NEXT(bif, bif_next) == NULL) {
1969 mc = m;
1970 used = 1;
1971 } else {
1972 mc = m_copypacket(m, MB_DONTWAIT);
1973 if (mc == NULL) {
1974 sc->sc_ifp->if_oerrors++;
1975 continue;
1976 }
1977 }
1978 bridge_pfil_enqueue(dst_if, mc, runfilt);
1979 }
1980 if (used == 0)
1981 m_freem(m);
1982 }
1983
1984 /*
1985 * bridge_span:
1986 *
1987 * Duplicate a packet out one or more interfaces that are in span mode,
1988 * the original mbuf is unmodified.
1989 */
1990 static void
1991 bridge_span(struct bridge_softc *sc, struct mbuf *m)
1992 {
1993 struct bridge_iflist *bif;
1994 struct ifnet *dst_if;
1995 struct mbuf *mc;
1996
1997 if (LIST_EMPTY(&sc->sc_spanlist))
1998 return;
1999
2000 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2001 dst_if = bif->bif_ifp;
2002
2003 if ((dst_if->if_flags & IFF_RUNNING) == 0)
2004 continue;
2005
2006 mc = m_copypacket(m, MB_DONTWAIT);
2007 if (mc == NULL) {
2008 sc->sc_ifp->if_oerrors++;
2009 continue;
2010 }
2011
2012 bridge_enqueue(dst_if, mc);
2013 }
2014 }
2015
2016 /*
2017 * bridge_rtupdate:
2018 *
2019 * Add a bridge routing entry.
2020 * Can be called from interrupt context.
2021 */
2022 static int
2023 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
2024 struct ifnet *dst_if, int setflags, uint8_t flags)
2025 {
2026 struct bridge_rtnode *brt;
2027 int error;
2028
2029 /*
2030 * A route for this destination might already exist. If so,
2031 * update it, otherwise create a new one.
2032 */
2033 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) {
2034 if (sc->sc_brtcnt >= sc->sc_brtmax)
2035 return (ENOSPC);
2036
2037 /*
2038 * Allocate a new bridge forwarding node, and
2039 * initialize the expiration time and Ethernet
2040 * address.
2041 */
2042 brt = kmalloc(sizeof(struct bridge_rtnode), M_DEVBUF,
2043 M_INTNOWAIT|M_ZERO);
2044 if (brt == NULL)
2045 return (ENOMEM);
2046
2047 brt->brt_flags = IFBAF_DYNAMIC;
2048 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2049
2050 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2051 kfree(brt, M_DEVBUF);
2052 return (error);
2053 }
2054 }
2055
2056 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2057 brt->brt_ifp = dst_if;
2058 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2059 brt->brt_expire = time_second + sc->sc_brttimeout;
2060 if (setflags)
2061 brt->brt_flags = flags;
2062
2063 return (0);
2064 }
2065
2066 /*
2067 * bridge_rtlookup:
2068 *
2069 * Lookup the destination interface for an address.
2070 */
2071 static struct ifnet *
2072 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr)
2073 {
2074 struct bridge_rtnode *brt;
2075
2076 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
2077 return (NULL);
2078
2079 return (brt->brt_ifp);
2080 }
2081
2082 /*
2083 * bridge_rttrim:
2084 *
2085 * Trim the routine table so that we have a number
2086 * of routing entries less than or equal to the
2087 * maximum number.
2088 */
2089 static void
2090 bridge_rttrim(struct bridge_softc *sc)
2091 {
2092 struct bridge_rtnode *brt, *nbrt;
2093
2094 /* Make sure we actually need to do this. */
2095 if (sc->sc_brtcnt <= sc->sc_brtmax)
2096 return;
2097
2098 /* Force an aging cycle; this might trim enough addresses. */
2099 bridge_rtage(sc);
2100 if (sc->sc_brtcnt <= sc->sc_brtmax)
2101 return;
2102
2103 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2104 nbrt = LIST_NEXT(brt, brt_list);
2105 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2106 bridge_rtnode_destroy(sc, brt);
2107 if (sc->sc_brtcnt <= sc->sc_brtmax)
2108 return;
2109 }
2110 }
2111 }
2112
2113 /*
2114 * bridge_timer:
2115 *
2116 * Aging timer for the bridge.
2117 */
2118 static void
2119 bridge_timer(void *arg)
2120 {
2121 struct bridge_softc *sc = arg;
2122
2123 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
2124
2125 bridge_rtage(sc);
2126
2127 if (sc->sc_ifp->if_flags & IFF_RUNNING)
2128 callout_reset(&sc->sc_brcallout,
2129 bridge_rtable_prune_period * hz, bridge_timer, sc);
2130
2131 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
2132 }
2133
2134 /*
2135 * bridge_rtage:
2136 *
2137 * Perform an aging cycle.
2138 */
2139 static void
2140 bridge_rtage(struct bridge_softc *sc)
2141 {
2142 struct bridge_rtnode *brt, *nbrt;
2143
2144 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2145 nbrt = LIST_NEXT(brt, brt_list);
2146 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2147 if (time_second >= brt->brt_expire)
2148 bridge_rtnode_destroy(sc, brt);
2149 }
2150 }
2151 }
2152
2153 /*
2154 * bridge_rtflush:
2155 *
2156 * Remove all dynamic addresses from the bridge.
2157 */
2158 static void
2159 bridge_rtflush(struct bridge_softc *sc, int full)
2160 {
2161 struct bridge_rtnode *brt, *nbrt;
2162
2163 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2164 nbrt = LIST_NEXT(brt, brt_list);
2165 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2166 bridge_rtnode_destroy(sc, brt);
2167 }
2168 }
2169
2170 /*
2171 * bridge_rtdaddr:
2172 *
2173 * Remove an address from the table.
2174 */
2175 static int
2176 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr)
2177 {
2178 struct bridge_rtnode *brt;
2179
2180 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
2181 return (ENOENT);
2182
2183 bridge_rtnode_destroy(sc, brt);
2184 return (0);
2185 }
2186
2187 /*
2188 * bridge_rtdelete:
2189 *
2190 * Delete routes to a speicifc member interface.
2191 */
2192 void
2193 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2194 {
2195 struct bridge_rtnode *brt, *nbrt;
2196
2197 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
2198 nbrt = LIST_NEXT(brt, brt_list);
2199 if (brt->brt_ifp == ifp && (full ||
2200 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2201 bridge_rtnode_destroy(sc, brt);
2202 }
2203 }
2204
2205 /*
2206 * bridge_rtable_init:
2207 *
2208 * Initialize the route table for this bridge.
2209 */
2210 static int
2211 bridge_rtable_init(struct bridge_softc *sc)
2212 {
2213 int i;
2214
2215 sc->sc_rthash = kmalloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2216 M_DEVBUF, M_WAITOK);
2217
2218 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2219 LIST_INIT(&sc->sc_rthash[i]);
2220
2221 sc->sc_rthash_key = karc4random();
2222
2223 LIST_INIT(&sc->sc_rtlist);
2224
2225 return (0);
2226 }
2227
2228 /*
2229 * bridge_rtable_fini:
2230 *
2231 * Deconstruct the route table for this bridge.
2232 */
2233 static void
2234 bridge_rtable_fini(struct bridge_softc *sc)
2235 {
2236
2237 kfree(sc->sc_rthash, M_DEVBUF);
2238 }
2239
2240 /*
2241 * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2242 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2243 */
2244 #define mix(a, b, c) \
2245 do { \
2246 a -= b; a -= c; a ^= (c >> 13); \
2247 b -= c; b -= a; b ^= (a << 8); \
2248 c -= a; c -= b; c ^= (b >> 13); \
2249 a -= b; a -= c; a ^= (c >> 12); \
2250 b -= c; b -= a; b ^= (a << 16); \
2251 c -= a; c -= b; c ^= (b >> 5); \
2252 a -= b; a -= c; a ^= (c >> 3); \
2253 b -= c; b -= a; b ^= (a << 10); \
2254 c -= a; c -= b; c ^= (b >> 15); \
2255 } while (/*CONSTCOND*/0)
2256
2257 static __inline uint32_t
2258 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2259 {
2260 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2261
2262 b += addr[5] << 8;
2263 b += addr[4];
2264 a += addr[3] << 24;
2265 a += addr[2] << 16;
2266 a += addr[1] << 8;
2267 a += addr[0];
2268
2269 mix(a, b, c);
2270
2271 return (c & BRIDGE_RTHASH_MASK);
2272 }
2273
2274 #undef mix
2275
2276 static int
2277 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2278 {
2279 int i, d;
2280
2281 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2282 d = ((int)a[i]) - ((int)b[i]);
2283 }
2284
2285 return (d);
2286 }
2287
2288 /*
2289 * bridge_rtnode_lookup:
2290 *
2291 * Look up a bridge route node for the specified destination.
2292 */
2293 static struct bridge_rtnode *
2294 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr)
2295 {
2296 struct bridge_rtnode *brt;
2297 uint32_t hash;
2298 int dir;
2299
2300 hash = bridge_rthash(sc, addr);
2301 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2302 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2303 if (dir == 0)
2304 return (brt);
2305 if (dir > 0)
2306 return (NULL);
2307 }
2308
2309 return (NULL);
2310 }
2311
2312 /*
2313 * bridge_rtnode_insert:
2314 *
2315 * Insert the specified bridge node into the route table. We
2316 * assume the entry is not already in the table.
2317 */
2318 static int
2319 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2320 {
2321 struct bridge_rtnode *lbrt;
2322 uint32_t hash;
2323 int dir;
2324
2325 hash = bridge_rthash(sc, brt->brt_addr);
2326
2327 lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2328 if (lbrt == NULL) {
2329 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2330 goto out;
2331 }
2332
2333 do {
2334 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2335 if (dir == 0)
2336 return (EEXIST);
2337 if (dir > 0) {
2338 LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2339 goto out;
2340 }
2341 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2342 LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2343 goto out;
2344 }
2345 lbrt = LIST_NEXT(lbrt, brt_hash);
2346 } while (lbrt != NULL);
2347
2348 #ifdef DIAGNOSTIC
2349 panic("bridge_rtnode_insert: impossible");
2350 #endif
2351
2352 out:
2353 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2354 sc->sc_brtcnt++;
2355
2356 return (0);
2357 }
2358
2359 /*
2360 * bridge_rtnode_destroy:
2361 *
2362 * Destroy a bridge rtnode.
2363 */
2364 static void
2365 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2366 {
2367
2368 LIST_REMOVE(brt, brt_hash);
2369
2370 LIST_REMOVE(brt, brt_list);
2371 sc->sc_brtcnt--;
2372 kfree(brt, M_DEVBUF);
2373 }
2374
2375 /*
2376 * Send bridge packets through pfil if they are one of the types pfil can deal
2377 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
2378 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2379 * that interface.
2380 */
2381 static int
2382 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2383 {
2384 int snap, error, i, hlen;
2385 struct ether_header *eh1, eh2;
2386 struct ip *ip;
2387 struct llc llc1;
2388 u_int16_t ether_type;
2389
2390 snap = 0;
2391 error = -1; /* Default error if not error == 0 */
2392
2393 if (pfil_bridge == 0 && pfil_member == 0)
2394 return (0); /* filtering is disabled */
2395
2396 i = min((*mp)->m_pkthdr.len, max_protohdr);
2397 if ((*mp)->m_len < i) {
2398 *mp = m_pullup(*mp, i);
2399 if (*mp == NULL) {
2400 kprintf("%s: m_pullup failed\n", __func__);
2401 return (-1);
2402 }
2403 }
2404
2405 eh1 = mtod(*mp, struct ether_header *);
2406 ether_type = ntohs(eh1->ether_type);
2407
2408 /*
2409 * Check for SNAP/LLC.
2410 */
2411 if (ether_type < ETHERMTU) {
2412 struct llc *llc2 = (struct llc *)(eh1 + 1);
2413
2414 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
2415 llc2->llc_dsap == LLC_SNAP_LSAP &&
2416 llc2->llc_ssap == LLC_SNAP_LSAP &&
2417 llc2->llc_control == LLC_UI) {
2418 ether_type = htons(llc2->llc_un.type_snap.ether_type);
2419 snap = 1;
2420 }
2421 }
2422
2423 /*
2424 * If we're trying to filter bridge traffic, don't look at anything
2425 * other than IP and ARP traffic. If the filter doesn't understand
2426 * IPv6, don't allow IPv6 through the bridge either. This is lame
2427 * since if we really wanted, say, an AppleTalk filter, we are hosed,
2428 * but of course we don't have an AppleTalk filter to begin with.
2429 * (Note that since pfil doesn't understand ARP it will pass *ALL*
2430 * ARP traffic.)
2431 */
2432 switch (ether_type) {
2433 case ETHERTYPE_ARP:
2434 case ETHERTYPE_REVARP:
2435 return (0); /* Automatically pass */
2436 case ETHERTYPE_IP:
2437 #ifdef INET6
2438 case ETHERTYPE_IPV6:
2439 #endif /* INET6 */
2440 break;
2441 default:
2442 /*
2443 * Check to see if the user wants to pass non-ip
2444 * packets, these will not be checked by pfil(9) and
2445 * passed unconditionally so the default is to drop.
2446 */
2447 if (pfil_onlyip)
2448 goto bad;
2449 }
2450
2451 /* Strip off the Ethernet header and keep a copy. */
2452 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
2453 m_adj(*mp, ETHER_HDR_LEN);
2454
2455 /* Strip off snap header, if present */
2456 if (snap) {
2457 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
2458 m_adj(*mp, sizeof(struct llc));
2459 }
2460
2461 /*
2462 * Check the IP header for alignment and errors
2463 */
2464 if (dir == PFIL_IN) {
2465 switch (ether_type) {
2466 case ETHERTYPE_IP:
2467 error = bridge_ip_checkbasic(mp);
2468 break;
2469 #ifdef INET6
2470 case ETHERTYPE_IPV6:
2471 error = bridge_ip6_checkbasic(mp);
2472 break;
2473 #endif /* INET6 */
2474 default:
2475 error = 0;
2476 }
2477 if (error)
2478 goto bad;
2479 }
2480
2481 error = 0;
2482
2483 /*
2484 * Run the packet through pfil
2485 */
2486 switch (ether_type)
2487 {
2488 case ETHERTYPE_IP :
2489 /*
2490 * before calling the firewall, swap fields the same as
2491 * IP does. here we assume the header is contiguous
2492 */
2493 ip = mtod(*mp, struct ip *);
2494
2495 ip->ip_len = ntohs(ip->ip_len);
2496 ip->ip_off = ntohs(ip->ip_off);
2497
2498 /*
2499 * Run pfil on the member interface and the bridge, both can
2500 * be skipped by clearing pfil_member or pfil_bridge.
2501 *
2502 * Keep the order:
2503 * in_if -> bridge_if -> out_if
2504 */
2505 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
2506 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
2507 dir);
2508
2509 if (*mp == NULL || error != 0) /* filter may consume */
2510 break;
2511
2512 if (pfil_member && ifp != NULL)
2513 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
2514 dir);
2515
2516 if (*mp == NULL || error != 0) /* filter may consume */
2517 break;
2518
2519 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
2520 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
2521 dir);
2522
2523 if (*mp == NULL || error != 0) /* filter may consume */
2524 break;
2525
2526 /* check if we need to fragment the packet */
2527 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
2528 i = (*mp)->m_pkthdr.len;
2529 if (i > ifp->if_mtu) {
2530 error = bridge_fragment(ifp, *mp, &eh2, snap,
2531 &llc1);
2532 return (error);
2533 }
2534 }
2535
2536 /* Recalculate the ip checksum and restore byte ordering */
2537 ip = mtod(*mp, struct ip *);
2538 hlen = ip->ip_hl << 2;
2539 if (hlen < sizeof(struct ip))
2540 goto bad;
2541 if (hlen > (*mp)->m_len) {
2542 if ((*mp = m_pullup(*mp, hlen)) == 0)
2543 goto bad;
2544 ip = mtod(*mp, struct ip *);
2545 if (ip == NULL)
2546 goto bad;
2547 }
2548 ip->ip_len = htons(ip->ip_len);
2549 ip->ip_off = htons(ip->ip_off);
2550 ip->ip_sum = 0;
2551 if (hlen == sizeof(struct ip))
2552 ip->ip_sum = in_cksum_hdr(ip);
2553 else
2554 ip->ip_sum = in_cksum(*mp, hlen);
2555
2556 break;
2557 #ifdef INET6
2558 case ETHERTYPE_IPV6 :
2559 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
2560 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
2561 dir);
2562
2563 if (*mp == NULL || error != 0) /* filter may consume */
2564 break;
2565
2566 if (pfil_member && ifp != NULL)
2567 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
2568 dir);
2569
2570 if (*mp == NULL || error != 0) /* filter may consume */
2571 break;
2572
2573 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
2574 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
2575 dir);
2576 break;
2577 #endif
2578 default :
2579 error = 0;
2580 break;
2581 }
2582
2583 if (*mp == NULL)
2584 return (error);
2585 if (error != 0)
2586 goto bad;
2587
2588 error = -1;
2589
2590 /*
2591 * Finally, put everything back the way it was and return
2592 */
2593 if (snap) {
2594 M_PREPEND(*mp, sizeof(struct llc), MB_DONTWAIT);
2595 if (*mp == NULL)
2596 return (error);
2597 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
2598 }
2599
2600 M_PREPEND(*mp, ETHER_HDR_LEN, MB_DONTWAIT);
2601 if (*mp == NULL)
2602 return (error);
2603 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
2604
2605 return (0);
2606
2607 bad:
2608 m_freem(*mp);
2609 *mp = NULL;
2610 return (error);
2611 }
2612
2613 /*
2614 * Perform basic checks on header size since
2615 * pfil assumes ip_input has already processed
2616 * it for it. Cut-and-pasted from ip_input.c.
2617 * Given how simple the IPv6 version is,
2618 * does the IPv4 version really need to be
2619 * this complicated?
2620 *
2621 * XXX Should we update ipstat here, or not?
2622 * XXX Right now we update ipstat but not
2623 * XXX csum_counter.
2624 */
2625 static int
2626 bridge_ip_checkbasic(struct mbuf **mp)
2627 {
2628 struct mbuf *m = *mp;
2629 struct ip *ip;
2630 int len, hlen;
2631 u_short sum;
2632
2633 if (*mp == NULL)
2634 return (-1);
2635 #if notyet
2636 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
2637 if ((m = m_copyup(m, sizeof(struct ip),
2638 (max_linkhdr + 3) & ~3)) == NULL) {
2639 /* XXXJRT new stat, please */
2640 ipstat.ips_toosmall++;
2641 goto bad;
2642 }
2643 } else
2644 #endif
2645 #ifndef __predict_false
2646 #define __predict_false(x) x
2647 #endif
2648 if (__predict_false(m->m_len < sizeof (struct ip))) {
2649 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
2650 ipstat.ips_toosmall++;
2651 goto bad;
2652 }
2653 }
2654 ip = mtod(m, struct ip *);
2655 if (ip == NULL) goto bad;
2656
2657 if (ip->ip_v != IPVERSION) {
2658 ipstat.ips_badvers++;
2659 goto bad;
2660 }
2661 hlen = ip->ip_hl << 2;
2662 if (hlen < sizeof(struct ip)) { /* minimum header length */
2663 ipstat.ips_badhlen++;
2664 goto bad;
2665 }
2666 if (hlen > m->m_len) {
2667 if ((m = m_pullup(m, hlen)) == 0) {
2668 ipstat.ips_badhlen++;
2669 goto bad;
2670 }
2671 ip = mtod(m, struct ip *);
2672 if (ip == NULL) goto bad;
2673 }
2674
2675 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
2676 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
2677 } else {
2678 if (hlen == sizeof(struct ip)) {
2679 sum = in_cksum_hdr(ip);
2680 } else {
2681 sum = in_cksum(m, hlen);
2682 }
2683 }
2684 if (sum) {
2685 ipstat.ips_badsum++;
2686 goto bad;
2687 }
2688
2689 /* Retrieve the packet length. */
2690 len = ntohs(ip->ip_len);
2691
2692 /*
2693 * Check for additional length bogosity
2694 */
2695 if (len < hlen) {
2696 ipstat.ips_badlen++;
2697 goto bad;
2698 }
2699
2700 /*
2701 * Check that the amount of data in the buffers
2702 * is as at least much as the IP header would have us expect.
2703 * Drop packet if shorter than we expect.
2704 */
2705 if (m->m_pkthdr.len < len) {
2706 ipstat.ips_tooshort++;
2707 goto bad;
2708 }
2709
2710 /* Checks out, proceed */
2711 *mp = m;
2712 return (0);
2713
2714 bad:
2715 *mp = m;
2716 return (-1);
2717 }
2718
2719 #ifdef INET6
2720 /*
2721 * Same as above, but for IPv6.
2722 * Cut-and-pasted from ip6_input.c.
2723 * XXX Should we update ip6stat, or not?
2724 */
2725 static int
2726 bridge_ip6_checkbasic(struct mbuf **mp)
2727 {
2728 struct mbuf *m = *mp;
2729 struct ip6_hdr *ip6;
2730
2731 /*
2732 * If the IPv6 header is not aligned, slurp it up into a new
2733 * mbuf with space for link headers, in the event we forward
2734 * it. Otherwise, if it is aligned, make sure the entire base
2735 * IPv6 header is in the first mbuf of the chain.
2736 */
2737 #if notyet
2738 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
2739 struct ifnet *inifp = m->m_pkthdr.rcvif;
2740 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
2741 (max_linkhdr + 3) & ~3)) == NULL) {
2742 /* XXXJRT new stat, please */
2743 ip6stat.ip6s_toosmall++;
2744 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
2745 goto bad;
2746 }
2747 } else
2748 #endif
2749 if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
2750 struct ifnet *inifp = m->m_pkthdr.rcvif;
2751 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
2752 ip6stat.ip6s_toosmall++;
2753 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
2754 goto bad;
2755 }
2756 }
2757
2758 ip6 = mtod(m, struct ip6_hdr *);
2759
2760 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
2761 ip6stat.ip6s_badvers++;
2762 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
2763 goto bad;
2764 }
2765
2766 /* Checks out, proceed */
2767 *mp = m;
2768 return (0);
2769
2770 bad:
2771 *mp = m;
2772 return (-1);
2773 }
2774 #endif /* INET6 */
2775
2776 /*
2777 * bridge_fragment:
2778 *
2779 * Return a fragmented mbuf chain.
2780 */
2781 static int
2782 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
2783 int snap, struct llc *llc)
2784 {
2785 struct mbuf *m0;
2786 struct ip *ip;
2787 int error = -1;
2788
2789 if (m->m_len < sizeof(struct ip) &&
2790 (m = m_pullup(m, sizeof(struct ip))) == NULL)
2791 goto out;
2792 ip = mtod(m, struct ip *);
2793
2794 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
2795 CSUM_DELAY_IP);
2796 if (error)
2797 goto out;
2798
2799 /* walk the chain and re-add the Ethernet header */
2800 for (m0 = m; m0; m0 = m0->m_nextpkt) {
2801 if (error == 0) {
2802 if (snap) {
2803 M_PREPEND(m0, sizeof(struct llc), MB_DONTWAIT);
2804 if (m0 == NULL) {
2805 error = ENOBUFS;
2806 continue;
2807 }
2808 bcopy(llc, mtod(m0, caddr_t),
2809 sizeof(struct llc));
2810 }
2811 M_PREPEND(m0, ETHER_HDR_LEN, MB_DONTWAIT);
2812 if (m0 == NULL) {
2813 error = ENOBUFS;
2814 continue;
2815 }
2816 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
2817 } else
2818 m_freem(m);
2819 }
2820
2821 if (error == 0)
2822 ipstat.ips_fragmented++;
2823
2824 return (error);
2825
2826 out:
2827 if (m != NULL)
2828 m_freem(m);
2829 return (error);
2830 }
2831
2832 static void
2833 bridge_enqueue_handler(struct netmsg *nmsg)
2834 {
2835 struct netmsg_packet *nmp;
2836 struct ifnet *dst_ifp;
2837 struct mbuf *m;
2838
2839 nmp = (struct netmsg_packet *)nmsg;
2840 m = nmp->nm_packet;
2841 dst_ifp = nmp->nm_netmsg.nm_lmsg.u.ms_resultp;
2842
2843 bridge_handoff_notags(dst_ifp, m);
2844 }
2845
2846 static void
2847 bridge_pfil_enqueue_handler(struct netmsg *nmsg)
2848 {
2849 struct netmsg_packet *nmp;
2850 struct ifnet *dst_ifp;
2851 struct mbuf *m;
2852
2853 nmp = (struct netmsg_packet *)nmsg;
2854 m = nmp->nm_packet;
2855 dst_ifp = nmp->nm_netmsg.nm_lmsg.u.ms_resultp;
2856
2857 /*
2858 * Filter on the output interface. Pass a NULL bridge interface
2859 * pointer so we do not redundantly filter on the bridge for
2860 * each interface we broadcast on.
2861 */
2862 if (inet_pfil_hook.ph_hashooks > 0
2863 #ifdef INET6
2864 || inet6_pfil_hook.ph_hashooks > 0
2865 #endif
2866 ) {
2867 if (bridge_pfil(&m, NULL, dst_ifp, PFIL_OUT) != 0)
2868 return;
2869 if (m == NULL)
2870 return;
2871 }
2872 bridge_handoff_notags(dst_ifp, m);
2873 }
2874
2875 static void
2876 bridge_handoff(struct ifnet *dst_ifp, struct mbuf *m)
2877 {
2878 while (m->m_type == MT_TAG) {
2879 /* XXX see ether_output_frame for full rules check */
2880 m = m->m_next;
2881 }
2882 bridge_handoff_notags(dst_ifp, m);
2883 }
2884
2885 static void
2886 bridge_handoff_notags(struct ifnet *dst_ifp, struct mbuf *m)
2887 {
2888 struct mbuf *m0;
2889
2890 KKASSERT(m->m_type != MT_TAG);
2891
2892 lwkt_serialize_enter(dst_ifp->if_serializer);
2893
2894 /* We may be sending a fragment so traverse the mbuf */
2895 for (; m; m = m0) {
2896 struct altq_pktattr pktattr;
2897
2898 m0 = m->m_nextpkt;
2899 m->m_nextpkt = NULL;
2900
2901 if (ifq_is_enabled(&dst_ifp->if_snd))
2902 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr);
2903
2904 ifq_handoff(dst_ifp, m, &pktattr);
2905 }
2906
2907 lwkt_serialize_exit(dst_ifp->if_serializer);
2908 }
DragonFly vkernel multiprocessor port