FreeBSD/Linux Kernel Cross Reference
sys/net/bridge.c
1 /*-
2 * Copyright (c) 1998-2002 Luigi Rizzo
3 *
4 * Work partly supported by: Cisco Systems, Inc. - NSITE lab, RTP, NC
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/5.4/sys/net/bridge.c 145335 2005-04-20 19:11:07Z cvs2svn $
28 */
29
30 /*
31 * This code implements bridging in FreeBSD. It only acts on ethernet
32 * interfaces, including VLANs (others are still usable for routing).
33 * A FreeBSD host can implement multiple logical bridges, called
34 * "clusters". Each cluster is made of a set of interfaces, and
35 * identified by a "cluster-id" which is a number in the range 1..2^16-1.
36 *
37 * Bridging is enabled by the sysctl variable
38 * net.link.ether.bridge.enable
39 * the grouping of interfaces into clusters is done with
40 * net.link.ether.bridge.config
41 * containing a list of interfaces each optionally followed by
42 * a colon and the cluster it belongs to (1 is the default).
43 * Separators can be spaces, commas or tabs, e.g.
44 * net.link.ether.bridge.config="fxp0:2 fxp1:2 dc0 dc1:1"
45 * Optionally bridged packets can be passed through the firewall,
46 * this is controlled by the variable
47 * net.link.ether.bridge.ipfw
48 *
49 * For each cluster there is a descriptor (cluster_softc) storing
50 * the following data structures:
51 * - a hash table with the MAC address and destination interface for each
52 * known node. The table is indexed using a hash of the source address.
53 * - an array with the MAC addresses of the interfaces used in the cluster.
54 *
55 * Input packets are tapped near the beginning of ether_input(), and
56 * analysed by bridge_in(). Depending on the result, the packet
57 * can be forwarded to one or more output interfaces using bdg_forward(),
58 * and/or sent to the upper layer (e.g. in case of multicast).
59 *
60 * Output packets are intercepted near the end of ether_output().
61 * The correct destination is selected by bridge_dst_lookup(),
62 * and then forwarding is done by bdg_forward().
63 *
64 * The arp code is also modified to let a machine answer to requests
65 * irrespective of the port the request came from.
66 *
67 * In case of loops in the bridging topology, the bridge detects this
68 * event and temporarily mutes output bridging on one of the ports.
69 * Periodically, interfaces are unmuted by bdg_timeout().
70 * Muting is only implemented as a safety measure, and also as
71 * a mechanism to support a user-space implementation of the spanning
72 * tree algorithm.
73 *
74 * To build a bridging kernel, use the following option
75 * option BRIDGE
76 * and then at runtime set the sysctl variable to enable bridging.
77 *
78 * Only one interface per cluster is supposed to have addresses set (but
79 * there are no substantial problems if you set addresses for none or
80 * for more than one interface).
81 * Bridging will act before routing, but nothing prevents a machine
82 * from doing both (modulo bugs in the implementation...).
83 *
84 * THINGS TO REMEMBER
85 * - bridging is incompatible with multicast routing on the same
86 * machine. There is not an easy fix to this.
87 * - be very careful when bridging VLANs
88 * - loop detection is still not very robust.
89 */
90
91 #include <sys/param.h>
92 #include <sys/mbuf.h>
93 #include <sys/malloc.h>
94 #include <sys/protosw.h>
95 #include <sys/systm.h>
96 #include <sys/socket.h> /* for net/if.h */
97 #include <sys/ctype.h> /* string functions */
98 #include <sys/kernel.h>
99 #include <sys/module.h>
100 #include <sys/sysctl.h>
101
102 #include <net/ethernet.h>
103 #include <net/if.h>
104 #include <net/if_arp.h> /* for struct arpcom */
105 #include <net/if_types.h>
106 #include <net/if_var.h>
107 #include <net/pfil.h>
108
109 #include <netinet/in.h>
110 #include <netinet/in_systm.h>
111 #include <netinet/in_var.h>
112 #include <netinet/ip.h>
113 #include <netinet/ip_var.h>
114
115 #include <net/route.h>
116 #include <netinet/ip_fw.h>
117 #include <netinet/ip_dummynet.h>
118 #include <net/bridge.h>
119
120 /*--------------------*/
121
122 #define ETHER_ADDR_COPY(_dst,_src) bcopy(_src, _dst, ETHER_ADDR_LEN)
123 #define ETHER_ADDR_EQ(_a1,_a2) (bcmp(_a1, _a2, ETHER_ADDR_LEN) == 0)
124
125 /*
126 * For each cluster, source MAC addresses are stored into a hash
127 * table which locates the port they reside on.
128 */
129 #define HASH_SIZE 8192 /* Table size, must be a power of 2 */
130
131 typedef struct hash_table { /* each entry. */
132 struct ifnet * name;
133 u_char etheraddr[ETHER_ADDR_LEN];
134 u_int16_t used; /* also, padding */
135 } bdg_hash_table ;
136
137 /*
138 * The hash function applied to MAC addresses. Out of the 6 bytes,
139 * the last ones tend to vary more. Since we are on a little endian machine,
140 * we have to do some gimmick...
141 */
142 #define HASH_FN(addr) ( \
143 ntohs( ((u_int16_t *)addr)[1] ^ ((u_int16_t *)addr)[2] ) & (HASH_SIZE -1))
144
145 /*
146 * This is the data structure where local addresses are stored.
147 */
148 struct bdg_addr {
149 u_char etheraddr[ETHER_ADDR_LEN];
150 u_int16_t _padding;
151 };
152
153 /*
154 * The configuration of each cluster includes the cluster id, a pointer to
155 * the hash table, and an array of local MAC addresses (of size "ports").
156 */
157 struct cluster_softc {
158 u_int16_t cluster_id;
159 u_int16_t ports;
160 bdg_hash_table *ht;
161 struct bdg_addr *my_macs; /* local MAC addresses */
162 };
163
164
165 extern struct protosw inetsw[]; /* from netinet/ip_input.c */
166
167 static int n_clusters; /* number of clusters */
168 static struct cluster_softc *clusters;
169
170 static struct mtx bdg_mtx;
171 #define BDG_LOCK_INIT() mtx_init(&bdg_mtx, "bridge", NULL, MTX_DEF)
172 #define BDG_LOCK_DESTROY() mtx_destroy(&bdg_mtx)
173 #define BDG_LOCK() mtx_lock(&bdg_mtx)
174 #define BDG_UNLOCK() mtx_unlock(&bdg_mtx)
175 #define BDG_LOCK_ASSERT() mtx_assert(&bdg_mtx, MA_OWNED)
176
177 #define BDG_MUTED(ifp) (ifp2sc[ifp->if_index].flags & IFF_MUTE)
178 #define BDG_MUTE(ifp) ifp2sc[ifp->if_index].flags |= IFF_MUTE
179 #define BDG_CLUSTER(ifp) (ifp2sc[ifp->if_index].cluster)
180
181 #define BDG_SAMECLUSTER(ifp,src) \
182 (src == NULL || BDG_CLUSTER(ifp) == BDG_CLUSTER(src) )
183
184 #ifdef __i386__
185 #define BDG_MATCH(a,b) ( \
186 ((u_int16_t *)(a))[2] == ((u_int16_t *)(b))[2] && \
187 *((u_int32_t *)(a)) == *((u_int32_t *)(b)) )
188 #define IS_ETHER_BROADCAST(a) ( \
189 *((u_int32_t *)(a)) == 0xffffffff && \
190 ((u_int16_t *)(a))[2] == 0xffff )
191 #else
192 /* for machines that do not support unaligned access */
193 #define BDG_MATCH(a,b) ETHER_ADDR_EQ(a,b)
194 #define IS_ETHER_BROADCAST(a) ETHER_ADDR_EQ(a,"\377\377\377\377\377\377")
195 #endif
196
197 SYSCTL_DECL(_net_link_ether);
198 SYSCTL_NODE(_net_link_ether, OID_AUTO, bridge, CTLFLAG_RD, 0,
199 "Bridge parameters");
200 static char bridge_version[] = "031224";
201 SYSCTL_STRING(_net_link_ether_bridge, OID_AUTO, version, CTLFLAG_RD,
202 bridge_version, 0, "software version");
203
204 #define BRIDGE_DEBUG
205 #ifdef BRIDGE_DEBUG
206 int bridge_debug = 0;
207 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, debug, CTLFLAG_RW, &bridge_debug,
208 0, "control debugging printfs");
209 #define DPRINTF(X) if (bridge_debug) printf X
210 #else
211 #define DPRINTF(X)
212 #endif
213
214 #ifdef BRIDGE_TIMING
215 /*
216 * For timing-related debugging, you can use the following macros.
217 * remember, rdtsc() only works on Pentium-class machines
218
219 quad_t ticks;
220 DDB(ticks = rdtsc();)
221 ... interesting code ...
222 DDB(bdg_fw_ticks += (u_long)(rdtsc() - ticks) ; bdg_fw_count++ ;)
223
224 *
225 */
226 #define DDB(x) x
227
228 static int bdg_fw_avg;
229 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, fw_avg, CTLFLAG_RW,
230 &bdg_fw_avg, 0,"Cycle counter avg");
231 static int bdg_fw_ticks;
232 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, fw_ticks, CTLFLAG_RW,
233 &bdg_fw_ticks, 0,"Cycle counter item");
234 static int bdg_fw_count;
235 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, fw_count, CTLFLAG_RW,
236 &bdg_fw_count, 0,"Cycle counter count");
237 #else
238 #define DDB(x)
239 #endif
240
241 static int bdginit(void);
242 static void parse_bdg_cfg(void);
243
244 static int bdg_ipf; /* IPFilter enabled in bridge */
245 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, ipf, CTLFLAG_RW,
246 &bdg_ipf, 0,"Pass bridged pkts through IPFilter");
247 static int bdg_ipfw;
248 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, ipfw, CTLFLAG_RW,
249 &bdg_ipfw,0,"Pass bridged pkts through firewall");
250
251 static int bdg_copy;
252 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, copy, CTLFLAG_RW,
253 &bdg_copy, 0, "Force packet copy in bdg_forward");
254
255 int bdg_ipfw_drops;
256 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, ipfw_drop,
257 CTLFLAG_RW, &bdg_ipfw_drops,0,"");
258 int bdg_ipfw_colls;
259 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, ipfw_collisions,
260 CTLFLAG_RW, &bdg_ipfw_colls,0,"");
261
262 static int bdg_thru;
263 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, packets, CTLFLAG_RW,
264 &bdg_thru, 0, "Packets through bridge");
265 static int bdg_dropped;
266 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, dropped, CTLFLAG_RW,
267 &bdg_dropped, 0, "Packets dropped in bdg_forward");
268 static int bdg_predict;
269 SYSCTL_INT(_net_link_ether_bridge, OID_AUTO, predict, CTLFLAG_RW,
270 &bdg_predict, 0, "Correctly predicted header location");
271
272 #ifdef BRIDGE_DEBUG
273 static char *bdg_dst_names[] = {
274 "BDG_NULL ",
275 "BDG_BCAST ",
276 "BDG_MCAST ",
277 "BDG_LOCAL ",
278 "BDG_DROP ",
279 "BDG_UNKNOWN ",
280 "BDG_IN ",
281 "BDG_OUT ",
282 "BDG_FORWARD " };
283 #endif /* BRIDGE_DEBUG */
284
285 /*
286 * System initialization
287 */
288 static struct bdg_stats bdg_stats ;
289 SYSCTL_STRUCT(_net_link_ether_bridge, OID_AUTO, stats, CTLFLAG_RD,
290 &bdg_stats, bdg_stats, "bridge statistics");
291
292 static struct callout bdg_callout;
293
294 /*
295 * Add an interface to a cluster, possibly creating a new entry in
296 * the cluster table. This requires reallocation of the table and
297 * updating pointers in ifp2sc.
298 */
299 static struct cluster_softc *
300 add_cluster(u_int16_t cluster_id, struct ifnet *ifp)
301 {
302 struct cluster_softc *c = NULL;
303 int i;
304
305 BDG_LOCK_ASSERT();
306
307 for (i = 0; i < n_clusters ; i++)
308 if (clusters[i].cluster_id == cluster_id)
309 goto found;
310
311 /* Not found, need to reallocate */
312 c = malloc((1+n_clusters) * sizeof (*c), M_IFADDR, M_NOWAIT | M_ZERO);
313 if (c == NULL) {/* malloc failure */
314 printf("-- bridge: cannot add new cluster\n");
315 goto bad;
316 }
317 c[n_clusters].ht = (struct hash_table *)
318 malloc(HASH_SIZE * sizeof(struct hash_table),
319 M_IFADDR, M_NOWAIT | M_ZERO);
320 if (c[n_clusters].ht == NULL) {
321 printf("-- bridge: cannot allocate hash table for new cluster\n");
322 goto bad;
323 }
324 c[n_clusters].my_macs = (struct bdg_addr *)
325 malloc(BDG_MAX_PORTS * sizeof(struct bdg_addr),
326 M_IFADDR, M_NOWAIT | M_ZERO);
327 if (c[n_clusters].my_macs == NULL) {
328 printf("-- bridge: cannot allocate mac addr table for new cluster\n");
329 free(c[n_clusters].ht, M_IFADDR);
330 goto bad;
331 }
332
333 c[n_clusters].cluster_id = cluster_id;
334 c[n_clusters].ports = 0;
335 /*
336 * now copy old descriptors here
337 */
338 if (n_clusters > 0) {
339 for (i=0; i < n_clusters; i++)
340 c[i] = clusters[i];
341 /*
342 * and finally update pointers in ifp2sc
343 */
344 for (i = 0 ; i < if_index && i < BDG_MAX_PORTS; i++)
345 if (ifp2sc[i].cluster != NULL)
346 ifp2sc[i].cluster = c + (ifp2sc[i].cluster - clusters);
347 free(clusters, M_IFADDR);
348 }
349 clusters = c;
350 i = n_clusters; /* index of cluster entry */
351 n_clusters++;
352 found:
353 c = clusters + i; /* the right cluster ... */
354 ETHER_ADDR_COPY(c->my_macs[c->ports].etheraddr, IFP2AC(ifp)->ac_enaddr);
355 c->ports++;
356 return c;
357 bad:
358 if (c)
359 free(c, M_IFADDR);
360 return NULL;
361 }
362
363
364 /*
365 * Turn off bridging, by clearing promisc mode on the interface,
366 * marking the interface as unused, and clearing the name in the
367 * stats entry.
368 * Also dispose the hash tables associated with the clusters.
369 */
370 static void
371 bridge_off(void)
372 {
373 struct ifnet *ifp ;
374 int i;
375
376 BDG_LOCK_ASSERT();
377
378 DPRINTF(("%s: n_clusters %d\n", __func__, n_clusters));
379
380 IFNET_RLOCK();
381 TAILQ_FOREACH(ifp, &ifnet, if_link) {
382 struct bdg_softc *b;
383
384 if (ifp->if_index >= BDG_MAX_PORTS)
385 continue; /* make sure we do not go beyond the end */
386 b = &ifp2sc[ifp->if_index];
387
388 if ( b->flags & IFF_BDG_PROMISC ) {
389 ifpromisc(ifp, 0);
390 b->flags &= ~(IFF_BDG_PROMISC|IFF_MUTE) ;
391 DPRINTF(("%s: %s promisc OFF if_flags 0x%x "
392 "bdg_flags 0x%x\n", __func__, ifp->if_xname,
393 ifp->if_flags, b->flags));
394 }
395 b->flags &= ~(IFF_USED) ;
396 b->cluster = NULL;
397 bdg_stats.s[ifp->if_index].name[0] = '\0';
398 }
399 IFNET_RUNLOCK();
400 /* flush_tables */
401
402 for (i=0; i < n_clusters; i++) {
403 free(clusters[i].ht, M_IFADDR);
404 free(clusters[i].my_macs, M_IFADDR);
405 }
406 if (clusters != NULL)
407 free(clusters, M_IFADDR);
408 clusters = NULL;
409 n_clusters =0;
410 }
411
412 /*
413 * set promisc mode on the interfaces we use.
414 */
415 static void
416 bridge_on(void)
417 {
418 struct ifnet *ifp ;
419
420 BDG_LOCK_ASSERT();
421
422 IFNET_RLOCK();
423 TAILQ_FOREACH(ifp, &ifnet, if_link) {
424 struct bdg_softc *b = &ifp2sc[ifp->if_index];
425
426 if ( !(b->flags & IFF_USED) )
427 continue ;
428 if ( !( ifp->if_flags & IFF_UP) ) {
429 if_up(ifp);
430 }
431 if ( !(b->flags & IFF_BDG_PROMISC) ) {
432 (void) ifpromisc(ifp, 1);
433 b->flags |= IFF_BDG_PROMISC ;
434 DPRINTF(("%s: %s promisc ON if_flags 0x%x bdg_flags 0x%x\n",
435 __func__, ifp->if_xname, ifp->if_flags, b->flags));
436 }
437 if (b->flags & IFF_MUTE) {
438 DPRINTF(("%s: unmuting %s\n", __func__, ifp->if_xname));
439 b->flags &= ~IFF_MUTE;
440 }
441 }
442 IFNET_RUNLOCK();
443 }
444
445 static char bridge_cfg[1024]; /* NB: in BSS so initialized to zero */
446
447 /**
448 * reconfigure bridge.
449 * This is also done every time we attach or detach an interface.
450 * Main use is to make sure that we do not bridge on some old
451 * (ejected) device. So, it would be really useful to have a
452 * pointer to the modified device as an argument. Without it, we
453 * have to scan all interfaces.
454 */
455 static void
456 reconfigure_bridge_locked(void)
457 {
458 BDG_LOCK_ASSERT();
459
460 bridge_off();
461 if (do_bridge) {
462 if (if_index >= BDG_MAX_PORTS) {
463 printf("-- sorry too many interfaces (%d, max is %d),"
464 " disabling bridging\n", if_index, BDG_MAX_PORTS);
465 do_bridge = 0;
466 return;
467 }
468 parse_bdg_cfg();
469 bridge_on();
470 }
471 }
472
473 static void
474 reconfigure_bridge(void)
475 {
476 BDG_LOCK();
477 reconfigure_bridge_locked();
478 BDG_UNLOCK();
479 }
480
481 /*
482 * parse the config string, set IFF_USED, name and cluster_id
483 * for all interfaces found.
484 * The config string is a list of "if[:cluster]" with
485 * a number of possible separators (see "sep"). In particular the
486 * use of the space lets you set bridge_cfg with the output from
487 * "ifconfig -l"
488 */
489 static void
490 parse_bdg_cfg(void)
491 {
492 char *p, *beg;
493 int l, cluster;
494 static const char *sep = ", \t";
495
496 BDG_LOCK_ASSERT();
497
498 for (p = bridge_cfg; *p ; p++) {
499 struct ifnet *ifp;
500 int found = 0;
501 char c;
502
503 if (index(sep, *p)) /* skip separators */
504 continue ;
505 /* names are lowercase and digits */
506 for ( beg = p ; islower(*p) || isdigit(*p) ; p++ )
507 ;
508 l = p - beg ; /* length of name string */
509 if (l == 0) /* invalid name */
510 break ;
511 if ( *p != ':' ) /* no ':', assume default cluster 1 */
512 cluster = 1 ;
513 else /* fetch cluster */
514 cluster = strtoul( p+1, &p, 10);
515 c = *p;
516 *p = '\0';
517 /*
518 * now search in interface list for a matching name
519 */
520 IFNET_RLOCK(); /* could sleep XXX */
521 TAILQ_FOREACH(ifp, &ifnet, if_link) {
522
523 if (!strncmp(beg, ifp->if_xname, max(l, strlen(ifp->if_xname)))) {
524 struct bdg_softc *b = &ifp2sc[ifp->if_index];
525 if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN) {
526 printf("%s is not an ethernet, continue\n", ifp->if_xname);
527 continue;
528 }
529 if (b->flags & IFF_USED) {
530 printf("%s already used, skipping\n", ifp->if_xname);
531 break;
532 }
533 b->cluster = add_cluster(htons(cluster), ifp);
534 b->flags |= IFF_USED ;
535 snprintf(bdg_stats.s[ifp->if_index].name,
536 sizeof(bdg_stats.s[ifp->if_index].name),
537 "%s:%d", ifp->if_xname, cluster);
538
539 DPRINTF(("%s: found %s next c %d\n", __func__,
540 bdg_stats.s[ifp->if_index].name, c));
541 found = 1;
542 break ;
543 }
544 }
545 IFNET_RUNLOCK();
546 if (!found)
547 printf("interface %s Not found in bridge\n", beg);
548 *p = c;
549 if (c == '\0')
550 break; /* no more */
551 }
552 }
553
554 /*
555 * handler for net.link.ether.bridge
556 */
557 static int
558 sysctl_bdg(SYSCTL_HANDLER_ARGS)
559 {
560 int enable = do_bridge;
561 int error;
562
563 error = sysctl_handle_int(oidp, &enable, 0, req);
564 enable = (enable) ? 1 : 0;
565 BDG_LOCK();
566 if (enable != do_bridge) {
567 do_bridge = enable;
568 reconfigure_bridge_locked();
569 }
570 BDG_UNLOCK();
571 return error ;
572 }
573 SYSCTL_PROC(_net_link_ether_bridge, OID_AUTO, enable, CTLTYPE_INT|CTLFLAG_RW,
574 &do_bridge, 0, &sysctl_bdg, "I", "Bridging");
575
576 /*
577 * handler for net.link.ether.bridge_cfg
578 */
579 static int
580 sysctl_bdg_cfg(SYSCTL_HANDLER_ARGS)
581 {
582 int error;
583 char *new_cfg;
584
585 new_cfg = malloc(sizeof(bridge_cfg), M_TEMP, M_WAITOK);
586 bcopy(bridge_cfg, new_cfg, sizeof(bridge_cfg));
587
588 error = sysctl_handle_string(oidp, new_cfg, oidp->oid_arg2, req);
589 if (error == 0) {
590 BDG_LOCK();
591 if (strcmp(new_cfg, bridge_cfg)) {
592 bcopy(new_cfg, bridge_cfg, sizeof(bridge_cfg));
593 reconfigure_bridge_locked();
594 }
595 BDG_UNLOCK();
596 }
597
598 free(new_cfg, M_TEMP);
599
600 return error;
601 }
602 SYSCTL_PROC(_net_link_ether_bridge, OID_AUTO, config, CTLTYPE_STRING|CTLFLAG_RW,
603 &bridge_cfg, sizeof(bridge_cfg), &sysctl_bdg_cfg, "A",
604 "Bridge configuration");
605
606 static int
607 sysctl_refresh(SYSCTL_HANDLER_ARGS)
608 {
609 if (req->newptr)
610 reconfigure_bridge();
611
612 return 0;
613 }
614 SYSCTL_PROC(_net_link_ether_bridge, OID_AUTO, refresh, CTLTYPE_INT|CTLFLAG_WR,
615 NULL, 0, &sysctl_refresh, "I", "iface refresh");
616
617 #ifndef BURN_BRIDGES
618 #define SYSCTL_OID_COMPAT(parent, nbr, name, kind, a1, a2, handler, fmt, descr)\
619 static struct sysctl_oid sysctl__##parent##_##name##_compat = { \
620 &sysctl_##parent##_children, { 0 }, \
621 nbr, kind, a1, a2, #name, handler, fmt, 0, descr }; \
622 DATA_SET(sysctl_set, sysctl__##parent##_##name##_compat)
623 #define SYSCTL_INT_COMPAT(parent, nbr, name, access, ptr, val, descr) \
624 SYSCTL_OID_COMPAT(parent, nbr, name, CTLTYPE_INT|(access), \
625 ptr, val, sysctl_handle_int, "I", descr)
626 #define SYSCTL_STRUCT_COMPAT(parent, nbr, name, access, ptr, type, descr)\
627 SYSCTL_OID_COMPAT(parent, nbr, name, CTLTYPE_OPAQUE|(access), \
628 ptr, sizeof(struct type), sysctl_handle_opaque, \
629 "S," #type, descr)
630 #define SYSCTL_PROC_COMPAT(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
631 SYSCTL_OID_COMPAT(parent, nbr, name, (access), \
632 ptr, arg, handler, fmt, descr)
633
634 SYSCTL_INT_COMPAT(_net_link_ether, OID_AUTO, bridge_ipf, CTLFLAG_RW,
635 &bdg_ipf, 0,"Pass bridged pkts through IPFilter");
636 SYSCTL_INT_COMPAT(_net_link_ether, OID_AUTO, bridge_ipfw, CTLFLAG_RW,
637 &bdg_ipfw,0,"Pass bridged pkts through firewall");
638 SYSCTL_STRUCT_COMPAT(_net_link_ether, PF_BDG, bdgstats, CTLFLAG_RD,
639 &bdg_stats, bdg_stats, "bridge statistics");
640 SYSCTL_PROC_COMPAT(_net_link_ether, OID_AUTO, bridge_cfg,
641 CTLTYPE_STRING|CTLFLAG_RW,
642 &bridge_cfg, sizeof(bridge_cfg), &sysctl_bdg_cfg, "A",
643 "Bridge configuration");
644 SYSCTL_PROC_COMPAT(_net_link_ether, OID_AUTO, bridge_refresh,
645 CTLTYPE_INT|CTLFLAG_WR,
646 NULL, 0, &sysctl_refresh, "I", "iface refresh");
647 #endif
648
649 static int bdg_loops;
650 static int bdg_slowtimer = 0;
651 static int bdg_age_index = 0; /* index of table position to age */
652
653 /*
654 * called periodically to flush entries etc.
655 */
656 static void
657 bdg_timeout(void *dummy)
658 {
659 if (do_bridge) {
660 int l, i;
661
662 BDG_LOCK();
663 /*
664 * age entries in the forwarding table.
665 */
666 l = bdg_age_index + HASH_SIZE/4 ;
667 if (l > HASH_SIZE)
668 l = HASH_SIZE;
669
670 for (i = 0; i < n_clusters; i++) {
671 bdg_hash_table *bdg_table = clusters[i].ht;
672 for (; bdg_age_index < l; bdg_age_index++)
673 if (bdg_table[bdg_age_index].used)
674 bdg_table[bdg_age_index].used = 0;
675 else if (bdg_table[bdg_age_index].name) {
676 DPRINTF(("%s: flushing stale entry %d\n",
677 __func__, bdg_age_index));
678 bdg_table[bdg_age_index].name = NULL;
679 }
680 }
681 if (bdg_age_index >= HASH_SIZE)
682 bdg_age_index = 0;
683
684 if (--bdg_slowtimer <= 0 ) {
685 bdg_slowtimer = 5;
686
687 bridge_on(); /* we just need unmute, really */
688 bdg_loops = 0;
689 }
690 BDG_UNLOCK();
691 }
692 callout_reset(&bdg_callout, 2*hz, bdg_timeout, NULL);
693 }
694
695 /*
696 * Find the right pkt destination:
697 * BDG_BCAST is a broadcast
698 * BDG_MCAST is a multicast
699 * BDG_LOCAL is for a local address
700 * BDG_DROP must be dropped
701 * other ifp of the dest. interface (incl.self)
702 *
703 * We assume this is only called for interfaces for which bridging
704 * is enabled, i.e. BDG_USED(ifp) is true.
705 */
706 static __inline struct ifnet *
707 bridge_dst_lookup(struct ether_header *eh, struct cluster_softc *c)
708 {
709 bdg_hash_table *bt; /* pointer to entry in hash table */
710
711 BDG_LOCK_ASSERT();
712
713 if (ETHER_IS_MULTICAST(eh->ether_dhost))
714 return IS_ETHER_BROADCAST(eh->ether_dhost) ? BDG_BCAST : BDG_MCAST;
715 /*
716 * Lookup local addresses in case one matches. We optimize
717 * for the common case of two interfaces.
718 */
719 KASSERT(c->ports != 0, ("lookup with no ports!"));
720 switch (c->ports) {
721 int i;
722 default:
723 for (i = c->ports-1; i > 1; i--) {
724 if (ETHER_ADDR_EQ(c->my_macs[i].etheraddr, eh->ether_dhost))
725 return BDG_LOCAL;
726 }
727 /* fall thru... */
728 case 2:
729 if (ETHER_ADDR_EQ(c->my_macs[1].etheraddr, eh->ether_dhost))
730 return BDG_LOCAL;
731 case 1:
732 if (ETHER_ADDR_EQ(c->my_macs[0].etheraddr, eh->ether_dhost))
733 return BDG_LOCAL;
734 }
735 /*
736 * Look for a possible destination in table
737 */
738 bt = &c->ht[HASH_FN(eh->ether_dhost)];
739 if (bt->name && ETHER_ADDR_EQ(bt->etheraddr, eh->ether_dhost))
740 return bt->name;
741 else
742 return BDG_UNKNOWN;
743 }
744
745 /**
746 * bridge_in() is invoked to perform bridging decision on input packets.
747 *
748 * On Input:
749 * eh Ethernet header of the incoming packet.
750 * ifp interface the packet is coming from.
751 *
752 * On Return: destination of packet, one of
753 * BDG_BCAST broadcast
754 * BDG_MCAST multicast
755 * BDG_LOCAL is only for a local address (do not forward)
756 * BDG_DROP drop the packet
757 * ifp ifp of the destination interface.
758 *
759 * Forwarding is not done directly to give a chance to some drivers
760 * to fetch more of the packet, or simply drop it completely.
761 */
762
763 static struct ifnet *
764 bridge_in(struct ifnet *ifp, struct ether_header *eh)
765 {
766 int index;
767 struct ifnet *dst, *old;
768 bdg_hash_table *bt; /* location in hash table */
769 int dropit = BDG_MUTED(ifp);
770
771 /*
772 * hash the source address
773 */
774 BDG_LOCK();
775 index = HASH_FN(eh->ether_shost);
776 bt = &BDG_CLUSTER(ifp)->ht[index];
777 bt->used = 1;
778 old = bt->name;
779 if (old) { /* the entry is valid */
780 if (!ETHER_ADDR_EQ(eh->ether_shost, bt->etheraddr)) {
781 bdg_ipfw_colls++;
782 bt->name = NULL; /* NB: will overwrite below */
783 } else if (old != ifp) {
784 /*
785 * Found a loop. Either a machine has moved, or there
786 * is a misconfiguration/reconfiguration of the network.
787 * First, do not forward this packet!
788 * Record the relocation anyways; then, if loops persist,
789 * suspect a reconfiguration and disable forwarding
790 * from the old interface.
791 */
792 bt->name = ifp; /* relocate address */
793 printf("-- loop (%d) %6D to %s from %s (%s)\n",
794 bdg_loops, eh->ether_shost, ".",
795 ifp->if_xname, old->if_xname,
796 BDG_MUTED(old) ? "muted":"active");
797 dropit = 1;
798 if (!BDG_MUTED(old)) {
799 if (bdg_loops++ > 10)
800 BDG_MUTE(old);
801 }
802 }
803 }
804
805 /*
806 * now write the source address into the table
807 */
808 if (bt->name == NULL) {
809 DPRINTF(("%s: new addr %6D at %d for %s\n",
810 __func__, eh->ether_shost, ".", index, ifp->if_xname));
811 ETHER_ADDR_COPY(bt->etheraddr, eh->ether_shost);
812 bt->name = ifp;
813 }
814 dst = bridge_dst_lookup(eh, BDG_CLUSTER(ifp));
815 BDG_UNLOCK();
816
817 /*
818 * bridge_dst_lookup can return the following values:
819 * BDG_BCAST, BDG_MCAST, BDG_LOCAL, BDG_UNKNOWN, BDG_DROP, ifp.
820 * For muted interfaces, or when we detect a loop, the first 3 are
821 * changed in BDG_LOCAL (we still listen to incoming traffic),
822 * and others to BDG_DROP (no use for the local host).
823 * Also, for incoming packets, ifp is changed to BDG_DROP if ifp == src.
824 * These changes are not necessary for outgoing packets from ether_output().
825 */
826 BDG_STAT(ifp, BDG_IN);
827 switch ((uintptr_t)dst) {
828 case (uintptr_t)BDG_BCAST:
829 case (uintptr_t)BDG_MCAST:
830 case (uintptr_t)BDG_LOCAL:
831 case (uintptr_t)BDG_UNKNOWN:
832 case (uintptr_t)BDG_DROP:
833 BDG_STAT(ifp, dst);
834 break;
835 default:
836 if (dst == ifp || dropit)
837 BDG_STAT(ifp, BDG_DROP);
838 else
839 BDG_STAT(ifp, BDG_FORWARD);
840 break;
841 }
842
843 if (dropit) {
844 if (dst == BDG_BCAST || dst == BDG_MCAST || dst == BDG_LOCAL)
845 dst = BDG_LOCAL;
846 else
847 dst = BDG_DROP;
848 } else {
849 if (dst == ifp)
850 dst = BDG_DROP;
851 }
852 DPRINTF(("%s: %6D ->%6D ty 0x%04x dst %s\n", __func__,
853 eh->ether_shost, ".",
854 eh->ether_dhost, ".",
855 ntohs(eh->ether_type),
856 (dst <= BDG_FORWARD) ? bdg_dst_names[(uintptr_t)dst] :
857 dst->if_xname));
858
859 return dst;
860 }
861
862 /*
863 * Return 1 if it's ok to send a packet out the specified interface.
864 * The interface must be:
865 * used for bridging,
866 * not muted,
867 * not full,
868 * up and running,
869 * not the source interface, and
870 * belong to the same cluster as the 'real_dst'.
871 */
872 static __inline int
873 bridge_ifok(struct ifnet *ifp, struct ifnet *src, struct ifnet *dst)
874 {
875 return (BDG_USED(ifp)
876 && !BDG_MUTED(ifp)
877 && !_IF_QFULL(&ifp->if_snd)
878 && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING)
879 && ifp != src
880 && BDG_SAMECLUSTER(ifp, dst));
881 }
882
883 /*
884 * Forward a packet to dst -- which can be a single interface or
885 * an entire cluster. The src port and muted interfaces are excluded.
886 *
887 * If src == NULL, the pkt comes from ether_output, and dst is the real
888 * interface the packet is originally sent to. In this case, we must forward
889 * it to the whole cluster.
890 * We never call bdg_forward from ether_output on interfaces which are
891 * not part of a cluster.
892 *
893 * If possible (i.e. we can determine that the caller does not need
894 * a copy), the packet is consumed here, and bdg_forward returns NULL.
895 * Otherwise, a pointer to a copy of the packet is returned.
896 */
897 static struct mbuf *
898 bdg_forward(struct mbuf *m0, struct ifnet *dst)
899 {
900 #define EH_RESTORE(_m) do { \
901 M_PREPEND((_m), ETHER_HDR_LEN, M_DONTWAIT); \
902 if ((_m) == NULL) { \
903 bdg_dropped++; \
904 return NULL; \
905 } \
906 if (eh != mtod((_m), struct ether_header *)) \
907 bcopy(&save_eh, mtod((_m), struct ether_header *), ETHER_HDR_LEN); \
908 else \
909 bdg_predict++; \
910 } while (0);
911 struct ether_header *eh;
912 struct ifnet *src;
913 struct ifnet *ifp, *last;
914 int shared = bdg_copy; /* someone else is using the mbuf */
915 int error;
916 struct ifnet *real_dst = dst; /* real dst from ether_output */
917 struct ip_fw_args args;
918 struct ether_header save_eh;
919 struct mbuf *m;
920
921 DDB(quad_t ticks; ticks = rdtsc();)
922
923 args.rule = ip_dn_claim_rule(m0);
924 if (args.rule)
925 shared = 0; /* For sure this is our own mbuf. */
926 else
927 bdg_thru++; /* count 1st time through bdg_forward */
928
929 /*
930 * The packet arrives with the Ethernet header at the front.
931 */
932 eh = mtod(m0, struct ether_header *);
933
934 src = m0->m_pkthdr.rcvif;
935 if (src == NULL) { /* packet from ether_output */
936 BDG_LOCK();
937 dst = bridge_dst_lookup(eh, BDG_CLUSTER(real_dst));
938 BDG_UNLOCK();
939 }
940
941 if (dst == BDG_DROP) { /* this should not happen */
942 printf("xx bdg_forward for BDG_DROP\n");
943 m_freem(m0);
944 bdg_dropped++;
945 return NULL;
946 }
947 if (dst == BDG_LOCAL) { /* this should not happen as well */
948 printf("xx ouch, bdg_forward for local pkt\n");
949 return m0;
950 }
951 if (dst == BDG_BCAST || dst == BDG_MCAST) {
952 /* need a copy for the local stack */
953 shared = 1;
954 }
955
956 /*
957 * Do filtering in a very similar way to what is done in ip_output.
958 * Only if firewall is loaded, enabled, and the packet is not
959 * from ether_output() (src==NULL, or we would filter it twice).
960 * Additional restrictions may apply e.g. non-IP, short packets,
961 * and pkts already gone through a pipe.
962 */
963 if (src != NULL && (
964 (inet_pfil_hook.ph_busy_count >= 0 && bdg_ipf != 0) ||
965 (IPFW_LOADED && bdg_ipfw != 0))) {
966
967 int i;
968
969 if (args.rule != NULL && fw_one_pass)
970 goto forward; /* packet already partially processed */
971 /*
972 * i need some amt of data to be contiguous, and in case others need
973 * the packet (shared==1) also better be in the first mbuf.
974 */
975 i = min(m0->m_pkthdr.len, max_protohdr) ;
976 if (shared || m0->m_len < i) {
977 m0 = m_pullup(m0, i);
978 if (m0 == NULL) {
979 printf("%s: m_pullup failed\n", __func__); /* XXXDPRINTF*/
980 bdg_dropped++;
981 return NULL;
982 }
983 eh = mtod(m0, struct ether_header *);
984 }
985
986 /*
987 * Processing below expects the Ethernet header is stripped.
988 * Furthermore, the mbuf chain might be replaced at various
989 * places. To deal with this we copy the header to a temporary
990 * location, strip the header, and restore it as needed.
991 */
992 bcopy(eh, &save_eh, ETHER_HDR_LEN); /* local copy for restore */
993 m_adj(m0, ETHER_HDR_LEN); /* temporarily strip header */
994
995 /*
996 * NetBSD-style generic packet filter, pfil(9), hooks.
997 * Enables ipf(8) in bridging.
998 */
999 if (!IPFW_LOADED) { /* XXX: Prevent ipfw from being run twice. */
1000 if (inet_pfil_hook.ph_busy_count >= 0 &&
1001 m0->m_pkthdr.len >= sizeof(struct ip) &&
1002 ntohs(save_eh.ether_type) == ETHERTYPE_IP) {
1003 /*
1004 * before calling the firewall, swap fields the same as IP does.
1005 * here we assume the pkt is an IP one and the header is contiguous
1006 */
1007 struct ip *ip = mtod(m0, struct ip *);
1008
1009 ip->ip_len = ntohs(ip->ip_len);
1010 ip->ip_off = ntohs(ip->ip_off);
1011
1012 if (pfil_run_hooks(&inet_pfil_hook, &m0, src, PFIL_IN, NULL) != 0) {
1013 /* NB: hook should consume packet */
1014 return NULL;
1015 }
1016 if (m0 == NULL) /* consumed by filter */
1017 return m0;
1018 /*
1019 * If we get here, the firewall has passed the pkt, but the mbuf
1020 * pointer might have changed. Restore ip and the fields ntohs()'d.
1021 */
1022 ip = mtod(m0, struct ip *);
1023 ip->ip_len = htons(ip->ip_len);
1024 ip->ip_off = htons(ip->ip_off);
1025 }
1026 } /* XXX: Prevent ipfw from being run twice. */
1027
1028 /*
1029 * Prepare arguments and call the firewall.
1030 */
1031 if (!IPFW_LOADED || bdg_ipfw == 0) {
1032 EH_RESTORE(m0); /* restore Ethernet header */
1033 goto forward; /* not using ipfw, accept the packet */
1034 }
1035
1036 /*
1037 * XXX The following code is very similar to the one in
1038 * if_ethersubr.c:ether_ipfw_chk()
1039 */
1040
1041 args.m = m0; /* the packet we are looking at */
1042 args.oif = NULL; /* this is an input packet */
1043 args.next_hop = NULL; /* we do not support forward yet */
1044 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
1045 i = ip_fw_chk_ptr(&args);
1046 m0 = args.m; /* in case the firewall used the mbuf */
1047
1048 if (m0 != NULL)
1049 EH_RESTORE(m0); /* restore Ethernet header */
1050
1051 if ( (i & IP_FW_PORT_DENY_FLAG) || m0 == NULL) /* drop */
1052 return m0;
1053
1054 if (i == 0) /* a PASS rule. */
1055 goto forward;
1056 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
1057 /*
1058 * Pass the pkt to dummynet, which consumes it.
1059 * If shared, make a copy and keep the original.
1060 */
1061 if (shared) {
1062 m = m_copypacket(m0, M_DONTWAIT);
1063 if (m == NULL) { /* copy failed, give up */
1064 bdg_dropped++;
1065 return NULL;
1066 }
1067 } else {
1068 m = m0 ; /* pass the original to dummynet */
1069 m0 = NULL ; /* and nothing back to the caller */
1070 }
1071
1072 args.oif = real_dst;
1073 ip_dn_io_ptr(m, (i & 0xffff),DN_TO_BDG_FWD, &args);
1074 return m0;
1075 }
1076 /*
1077 * XXX at some point, add support for divert/forward actions.
1078 * If none of the above matches, we have to drop the packet.
1079 */
1080 bdg_ipfw_drops++;
1081 return m0;
1082 }
1083 forward:
1084 /*
1085 * Again, bring up the headers in case of shared bufs to avoid
1086 * corruptions in the future.
1087 */
1088 if (shared) {
1089 int i = min(m0->m_pkthdr.len, max_protohdr);
1090
1091 m0 = m_pullup(m0, i);
1092 if (m0 == NULL) {
1093 bdg_dropped++;
1094 return NULL;
1095 }
1096 /* NB: eh is not used below; no need to recalculate it */
1097 }
1098
1099 /*
1100 * now real_dst is used to determine the cluster where to forward.
1101 * For packets coming from ether_input, this is the one of the 'src'
1102 * interface, whereas for locally generated packets (src==NULL) it
1103 * is the cluster of the original destination interface, which
1104 * was already saved into real_dst.
1105 */
1106 if (src != NULL)
1107 real_dst = src;
1108
1109 last = NULL;
1110 if (dst == BDG_BCAST || dst == BDG_MCAST || dst == BDG_UNKNOWN) {
1111 /*
1112 * Scan all ports and send copies to all but the last.
1113 */
1114 IFNET_RLOCK(); /* XXX replace with generation # */
1115 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1116 if (bridge_ifok(ifp, src, real_dst)) {
1117 if (last) {
1118 /*
1119 * At this point we know two interfaces need a copy
1120 * of the packet (last + ifp) so we must create a
1121 * copy to handoff to last.
1122 */
1123 m = m_copypacket(m0, M_DONTWAIT);
1124 if (m == NULL) {
1125 IFNET_RUNLOCK();
1126 printf("%s: , m_copypacket failed!\n", __func__);
1127 bdg_dropped++;
1128 return m0; /* the original is still there... */
1129 }
1130 IFQ_HANDOFF(last, m, error);
1131 if (!error)
1132 BDG_STAT(last, BDG_OUT);
1133 else
1134 bdg_dropped++;
1135 }
1136 last = ifp;
1137 }
1138 }
1139 IFNET_RUNLOCK();
1140 } else {
1141 if (bridge_ifok(dst, src, real_dst))
1142 last = dst;
1143 }
1144 if (last) {
1145 if (shared) { /* need to copy */
1146 m = m_copypacket(m0, M_DONTWAIT);
1147 if (m == NULL) {
1148 printf("%s: sorry, m_copypacket failed!\n", __func__);
1149 bdg_dropped++ ;
1150 return m0; /* the original is still there... */
1151 }
1152 } else { /* consume original */
1153 m = m0, m0 = NULL;
1154 }
1155 IFQ_HANDOFF(last, m, error);
1156 if (!error)
1157 BDG_STAT(last, BDG_OUT);
1158 else
1159 bdg_dropped++;
1160 }
1161
1162 DDB(bdg_fw_ticks += (u_long)(rdtsc() - ticks) ; bdg_fw_count++ ;
1163 if (bdg_fw_count != 0) bdg_fw_avg = bdg_fw_ticks/bdg_fw_count; )
1164 return m0;
1165 #undef EH_RESTORE
1166 }
1167
1168 /*
1169 * initialization of bridge code.
1170 */
1171 static int
1172 bdginit(void)
1173 {
1174 if (bootverbose)
1175 printf("BRIDGE %s loaded\n", bridge_version);
1176
1177 ifp2sc = malloc(BDG_MAX_PORTS * sizeof(struct bdg_softc),
1178 M_IFADDR, M_WAITOK | M_ZERO );
1179 if (ifp2sc == NULL)
1180 return ENOMEM;
1181
1182 BDG_LOCK_INIT();
1183
1184 n_clusters = 0;
1185 clusters = NULL;
1186 do_bridge = 0;
1187
1188 bzero(&bdg_stats, sizeof(bdg_stats));
1189
1190 bridge_in_ptr = bridge_in;
1191 bdg_forward_ptr = bdg_forward;
1192 bdgtakeifaces_ptr = reconfigure_bridge;
1193
1194 bdgtakeifaces_ptr(); /* XXX does this do anything? */
1195
1196 callout_init(&bdg_callout, debug_mpsafenet ? CALLOUT_MPSAFE : 0);
1197 bdg_timeout(0);
1198 return 0 ;
1199 }
1200
1201 static void
1202 bdgdestroy(void)
1203 {
1204 bridge_in_ptr = NULL;
1205 bdg_forward_ptr = NULL;
1206 bdgtakeifaces_ptr = NULL;
1207
1208 callout_stop(&bdg_callout);
1209 BDG_LOCK();
1210 bridge_off();
1211
1212 if (ifp2sc) {
1213 free(ifp2sc, M_IFADDR);
1214 ifp2sc = NULL;
1215 }
1216 BDG_LOCK_DESTROY();
1217 }
1218
1219 /*
1220 * initialization code, both for static and dynamic loading.
1221 */
1222 static int
1223 bridge_modevent(module_t mod, int type, void *unused)
1224 {
1225 int err;
1226
1227 switch (type) {
1228 case MOD_LOAD:
1229 if (BDG_LOADED)
1230 err = EEXIST;
1231 else
1232 err = bdginit();
1233 break;
1234 case MOD_UNLOAD:
1235 do_bridge = 0;
1236 bdgdestroy();
1237 err = 0;
1238 break;
1239 default:
1240 err = EINVAL;
1241 break;
1242 }
1243 return err;
1244 }
1245
1246 static moduledata_t bridge_mod = {
1247 "bridge",
1248 bridge_modevent,
1249 0
1250 };
1251
1252 DECLARE_MODULE(bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
1253 MODULE_VERSION(bridge, 1);
Cache object: 6af6170f91b0085ae44582c6530448c9
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