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[deliverable/linux.git] / net / 8021q / vlan.c
1 /*
2 * INET 802.1Q VLAN
3 * Ethernet-type device handling.
4 *
5 * Authors: Ben Greear <greearb@candelatech.com>
6 * Please send support related email to: netdev@vger.kernel.org
7 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8 *
9 * Fixes:
10 * Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
11 * Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
12 * Correct all the locking - David S. Miller <davem@redhat.com>;
13 * Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #include <asm/uaccess.h> /* for copy_from_user */
22 #include <linux/capability.h>
23 #include <linux/module.h>
24 #include <linux/netdevice.h>
25 #include <linux/skbuff.h>
26 #include <net/datalink.h>
27 #include <linux/mm.h>
28 #include <linux/in.h>
29 #include <linux/init.h>
30 #include <net/p8022.h>
31 #include <net/arp.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/notifier.h>
34 #include <net/net_namespace.h>
35 #include <net/netns/generic.h>
36
37 #include <linux/if_vlan.h>
38 #include "vlan.h"
39 #include "vlanproc.h"
40
41 #define DRV_VERSION "1.8"
42
43 /* Global VLAN variables */
44
45 int vlan_net_id;
46
47 /* Our listing of VLAN group(s) */
48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
49
50 static char vlan_fullname[] = "802.1Q VLAN Support";
51 static char vlan_version[] = DRV_VERSION;
52 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
53 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
54
55 static struct packet_type vlan_packet_type = {
56 .type = __constant_htons(ETH_P_8021Q),
57 .func = vlan_skb_recv, /* VLAN receive method */
58 };
59
60 /* End of global variables definitions. */
61
62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
63 {
64 return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
65 }
66
67 /* Must be invoked with RCU read lock (no preempt) */
68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
69 {
70 struct vlan_group *grp;
71 struct hlist_node *n;
72 int hash = vlan_grp_hashfn(real_dev->ifindex);
73
74 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
75 if (grp->real_dev == real_dev)
76 return grp;
77 }
78
79 return NULL;
80 }
81
82 /* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
83 *
84 * Must be invoked with RCU read lock (no preempt)
85 */
86 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
87 {
88 struct vlan_group *grp = __vlan_find_group(real_dev);
89
90 if (grp)
91 return vlan_group_get_device(grp, vlan_id);
92
93 return NULL;
94 }
95
96 static void vlan_group_free(struct vlan_group *grp)
97 {
98 int i;
99
100 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
101 kfree(grp->vlan_devices_arrays[i]);
102 kfree(grp);
103 }
104
105 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
106 {
107 struct vlan_group *grp;
108
109 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
110 if (!grp)
111 return NULL;
112
113 grp->real_dev = real_dev;
114 hlist_add_head_rcu(&grp->hlist,
115 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
116 return grp;
117 }
118
119 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
120 {
121 struct net_device **array;
122 unsigned int size;
123
124 ASSERT_RTNL();
125
126 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
127 if (array != NULL)
128 return 0;
129
130 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
131 array = kzalloc(size, GFP_KERNEL);
132 if (array == NULL)
133 return -ENOBUFS;
134
135 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
136 return 0;
137 }
138
139 static void vlan_rcu_free(struct rcu_head *rcu)
140 {
141 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
142 }
143
144 void unregister_vlan_dev(struct net_device *dev)
145 {
146 struct vlan_dev_info *vlan = vlan_dev_info(dev);
147 struct net_device *real_dev = vlan->real_dev;
148 struct vlan_group *grp;
149 u16 vlan_id = vlan->vlan_id;
150
151 ASSERT_RTNL();
152
153 grp = __vlan_find_group(real_dev);
154 BUG_ON(!grp);
155
156 /* Take it out of our own structures, but be sure to interlock with
157 * HW accelerating devices or SW vlan input packet processing.
158 */
159 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
160 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
161
162 vlan_group_set_device(grp, vlan_id, NULL);
163 grp->nr_vlans--;
164
165 synchronize_net();
166
167 unregister_netdevice(dev);
168
169 /* If the group is now empty, kill off the group. */
170 if (grp->nr_vlans == 0) {
171 vlan_gvrp_uninit_applicant(real_dev);
172
173 if (real_dev->features & NETIF_F_HW_VLAN_RX)
174 real_dev->vlan_rx_register(real_dev, NULL);
175
176 hlist_del_rcu(&grp->hlist);
177
178 /* Free the group, after all cpu's are done. */
179 call_rcu(&grp->rcu, vlan_rcu_free);
180 }
181
182 /* Get rid of the vlan's reference to real_dev */
183 dev_put(real_dev);
184 }
185
186 static void vlan_transfer_operstate(const struct net_device *dev,
187 struct net_device *vlandev)
188 {
189 /* Have to respect userspace enforced dormant state
190 * of real device, also must allow supplicant running
191 * on VLAN device
192 */
193 if (dev->operstate == IF_OPER_DORMANT)
194 netif_dormant_on(vlandev);
195 else
196 netif_dormant_off(vlandev);
197
198 if (netif_carrier_ok(dev)) {
199 if (!netif_carrier_ok(vlandev))
200 netif_carrier_on(vlandev);
201 } else {
202 if (netif_carrier_ok(vlandev))
203 netif_carrier_off(vlandev);
204 }
205 }
206
207 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
208 {
209 char *name = real_dev->name;
210
211 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
212 pr_info("8021q: VLANs not supported on %s\n", name);
213 return -EOPNOTSUPP;
214 }
215
216 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
217 !real_dev->vlan_rx_register) {
218 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
219 return -EOPNOTSUPP;
220 }
221
222 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
223 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
224 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
225 return -EOPNOTSUPP;
226 }
227
228 /* The real device must be up and operating in order to
229 * assosciate a VLAN device with it.
230 */
231 if (!(real_dev->flags & IFF_UP))
232 return -ENETDOWN;
233
234 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
235 return -EEXIST;
236
237 return 0;
238 }
239
240 int register_vlan_dev(struct net_device *dev)
241 {
242 struct vlan_dev_info *vlan = vlan_dev_info(dev);
243 struct net_device *real_dev = vlan->real_dev;
244 u16 vlan_id = vlan->vlan_id;
245 struct vlan_group *grp, *ngrp = NULL;
246 int err;
247
248 grp = __vlan_find_group(real_dev);
249 if (!grp) {
250 ngrp = grp = vlan_group_alloc(real_dev);
251 if (!grp)
252 return -ENOBUFS;
253 err = vlan_gvrp_init_applicant(real_dev);
254 if (err < 0)
255 goto out_free_group;
256 }
257
258 err = vlan_group_prealloc_vid(grp, vlan_id);
259 if (err < 0)
260 goto out_uninit_applicant;
261
262 err = register_netdevice(dev);
263 if (err < 0)
264 goto out_uninit_applicant;
265
266 /* Account for reference in struct vlan_dev_info */
267 dev_hold(real_dev);
268
269 vlan_transfer_operstate(real_dev, dev);
270 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
271
272 /* So, got the sucker initialized, now lets place
273 * it into our local structure.
274 */
275 vlan_group_set_device(grp, vlan_id, dev);
276 grp->nr_vlans++;
277
278 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
279 real_dev->vlan_rx_register(real_dev, ngrp);
280 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
281 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
282
283 return 0;
284
285 out_uninit_applicant:
286 if (ngrp)
287 vlan_gvrp_uninit_applicant(real_dev);
288 out_free_group:
289 if (ngrp)
290 vlan_group_free(ngrp);
291 return err;
292 }
293
294 /* Attach a VLAN device to a mac address (ie Ethernet Card).
295 * Returns 0 if the device was created or a negative error code otherwise.
296 */
297 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
298 {
299 struct net_device *new_dev;
300 struct net *net = dev_net(real_dev);
301 struct vlan_net *vn = net_generic(net, vlan_net_id);
302 char name[IFNAMSIZ];
303 int err;
304
305 if (vlan_id >= VLAN_VID_MASK)
306 return -ERANGE;
307
308 err = vlan_check_real_dev(real_dev, vlan_id);
309 if (err < 0)
310 return err;
311
312 /* Gotta set up the fields for the device. */
313 switch (vn->name_type) {
314 case VLAN_NAME_TYPE_RAW_PLUS_VID:
315 /* name will look like: eth1.0005 */
316 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
317 break;
318 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
319 /* Put our vlan.VID in the name.
320 * Name will look like: vlan5
321 */
322 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
323 break;
324 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
325 /* Put our vlan.VID in the name.
326 * Name will look like: eth0.5
327 */
328 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
329 break;
330 case VLAN_NAME_TYPE_PLUS_VID:
331 /* Put our vlan.VID in the name.
332 * Name will look like: vlan0005
333 */
334 default:
335 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
336 }
337
338 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
339 vlan_setup);
340
341 if (new_dev == NULL)
342 return -ENOBUFS;
343
344 dev_net_set(new_dev, net);
345 /* need 4 bytes for extra VLAN header info,
346 * hope the underlying device can handle it.
347 */
348 new_dev->mtu = real_dev->mtu;
349
350 vlan_dev_info(new_dev)->vlan_id = vlan_id;
351 vlan_dev_info(new_dev)->real_dev = real_dev;
352 vlan_dev_info(new_dev)->dent = NULL;
353 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
354
355 new_dev->rtnl_link_ops = &vlan_link_ops;
356 err = register_vlan_dev(new_dev);
357 if (err < 0)
358 goto out_free_newdev;
359
360 return 0;
361
362 out_free_newdev:
363 free_netdev(new_dev);
364 return err;
365 }
366
367 static void vlan_sync_address(struct net_device *dev,
368 struct net_device *vlandev)
369 {
370 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
371
372 /* May be called without an actual change */
373 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
374 return;
375
376 /* vlan address was different from the old address and is equal to
377 * the new address */
378 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
379 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
380 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
381
382 /* vlan address was equal to the old address and is different from
383 * the new address */
384 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
385 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
386 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
387
388 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
389 }
390
391 static void vlan_transfer_features(struct net_device *dev,
392 struct net_device *vlandev)
393 {
394 unsigned long old_features = vlandev->features;
395
396 vlandev->features &= ~dev->vlan_features;
397 vlandev->features |= dev->features & dev->vlan_features;
398
399 if (old_features != vlandev->features)
400 netdev_features_change(vlandev);
401 }
402
403 static void __vlan_device_event(struct net_device *dev, unsigned long event)
404 {
405 switch (event) {
406 case NETDEV_CHANGENAME:
407 vlan_proc_rem_dev(dev);
408 if (vlan_proc_add_dev(dev) < 0)
409 pr_warning("8021q: failed to change proc name for %s\n",
410 dev->name);
411 break;
412 case NETDEV_REGISTER:
413 if (vlan_proc_add_dev(dev) < 0)
414 pr_warning("8021q: failed to add proc entry for %s\n",
415 dev->name);
416 break;
417 case NETDEV_UNREGISTER:
418 vlan_proc_rem_dev(dev);
419 break;
420 }
421 }
422
423 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
424 void *ptr)
425 {
426 struct net_device *dev = ptr;
427 struct vlan_group *grp;
428 int i, flgs;
429 struct net_device *vlandev;
430
431 if (is_vlan_dev(dev))
432 __vlan_device_event(dev, event);
433
434 grp = __vlan_find_group(dev);
435 if (!grp)
436 goto out;
437
438 /* It is OK that we do not hold the group lock right now,
439 * as we run under the RTNL lock.
440 */
441
442 switch (event) {
443 case NETDEV_CHANGE:
444 /* Propagate real device state to vlan devices */
445 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
446 vlandev = vlan_group_get_device(grp, i);
447 if (!vlandev)
448 continue;
449
450 vlan_transfer_operstate(dev, vlandev);
451 }
452 break;
453
454 case NETDEV_CHANGEADDR:
455 /* Adjust unicast filters on underlying device */
456 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
457 vlandev = vlan_group_get_device(grp, i);
458 if (!vlandev)
459 continue;
460
461 flgs = vlandev->flags;
462 if (!(flgs & IFF_UP))
463 continue;
464
465 vlan_sync_address(dev, vlandev);
466 }
467 break;
468
469 case NETDEV_FEAT_CHANGE:
470 /* Propagate device features to underlying device */
471 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
472 vlandev = vlan_group_get_device(grp, i);
473 if (!vlandev)
474 continue;
475
476 vlan_transfer_features(dev, vlandev);
477 }
478
479 break;
480
481 case NETDEV_DOWN:
482 /* Put all VLANs for this dev in the down state too. */
483 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
484 vlandev = vlan_group_get_device(grp, i);
485 if (!vlandev)
486 continue;
487
488 flgs = vlandev->flags;
489 if (!(flgs & IFF_UP))
490 continue;
491
492 dev_change_flags(vlandev, flgs & ~IFF_UP);
493 }
494 break;
495
496 case NETDEV_UP:
497 /* Put all VLANs for this dev in the up state too. */
498 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
499 vlandev = vlan_group_get_device(grp, i);
500 if (!vlandev)
501 continue;
502
503 flgs = vlandev->flags;
504 if (flgs & IFF_UP)
505 continue;
506
507 dev_change_flags(vlandev, flgs | IFF_UP);
508 }
509 break;
510
511 case NETDEV_UNREGISTER:
512 /* Delete all VLANs for this dev. */
513 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
514 vlandev = vlan_group_get_device(grp, i);
515 if (!vlandev)
516 continue;
517
518 /* unregistration of last vlan destroys group, abort
519 * afterwards */
520 if (grp->nr_vlans == 1)
521 i = VLAN_GROUP_ARRAY_LEN;
522
523 unregister_vlan_dev(vlandev);
524 }
525 break;
526 }
527
528 out:
529 return NOTIFY_DONE;
530 }
531
532 static struct notifier_block vlan_notifier_block __read_mostly = {
533 .notifier_call = vlan_device_event,
534 };
535
536 /*
537 * VLAN IOCTL handler.
538 * o execute requested action or pass command to the device driver
539 * arg is really a struct vlan_ioctl_args __user *.
540 */
541 static int vlan_ioctl_handler(struct net *net, void __user *arg)
542 {
543 int err;
544 struct vlan_ioctl_args args;
545 struct net_device *dev = NULL;
546
547 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
548 return -EFAULT;
549
550 /* Null terminate this sucker, just in case. */
551 args.device1[23] = 0;
552 args.u.device2[23] = 0;
553
554 rtnl_lock();
555
556 switch (args.cmd) {
557 case SET_VLAN_INGRESS_PRIORITY_CMD:
558 case SET_VLAN_EGRESS_PRIORITY_CMD:
559 case SET_VLAN_FLAG_CMD:
560 case ADD_VLAN_CMD:
561 case DEL_VLAN_CMD:
562 case GET_VLAN_REALDEV_NAME_CMD:
563 case GET_VLAN_VID_CMD:
564 err = -ENODEV;
565 dev = __dev_get_by_name(net, args.device1);
566 if (!dev)
567 goto out;
568
569 err = -EINVAL;
570 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
571 goto out;
572 }
573
574 switch (args.cmd) {
575 case SET_VLAN_INGRESS_PRIORITY_CMD:
576 err = -EPERM;
577 if (!capable(CAP_NET_ADMIN))
578 break;
579 vlan_dev_set_ingress_priority(dev,
580 args.u.skb_priority,
581 args.vlan_qos);
582 err = 0;
583 break;
584
585 case SET_VLAN_EGRESS_PRIORITY_CMD:
586 err = -EPERM;
587 if (!capable(CAP_NET_ADMIN))
588 break;
589 err = vlan_dev_set_egress_priority(dev,
590 args.u.skb_priority,
591 args.vlan_qos);
592 break;
593
594 case SET_VLAN_FLAG_CMD:
595 err = -EPERM;
596 if (!capable(CAP_NET_ADMIN))
597 break;
598 err = vlan_dev_change_flags(dev,
599 args.vlan_qos ? args.u.flag : 0,
600 args.u.flag);
601 break;
602
603 case SET_VLAN_NAME_TYPE_CMD:
604 err = -EPERM;
605 if (!capable(CAP_NET_ADMIN))
606 break;
607 if ((args.u.name_type >= 0) &&
608 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
609 struct vlan_net *vn;
610
611 vn = net_generic(net, vlan_net_id);
612 vn->name_type = args.u.name_type;
613 err = 0;
614 } else {
615 err = -EINVAL;
616 }
617 break;
618
619 case ADD_VLAN_CMD:
620 err = -EPERM;
621 if (!capable(CAP_NET_ADMIN))
622 break;
623 err = register_vlan_device(dev, args.u.VID);
624 break;
625
626 case DEL_VLAN_CMD:
627 err = -EPERM;
628 if (!capable(CAP_NET_ADMIN))
629 break;
630 unregister_vlan_dev(dev);
631 err = 0;
632 break;
633
634 case GET_VLAN_REALDEV_NAME_CMD:
635 err = 0;
636 vlan_dev_get_realdev_name(dev, args.u.device2);
637 if (copy_to_user(arg, &args,
638 sizeof(struct vlan_ioctl_args)))
639 err = -EFAULT;
640 break;
641
642 case GET_VLAN_VID_CMD:
643 err = 0;
644 args.u.VID = vlan_dev_vlan_id(dev);
645 if (copy_to_user(arg, &args,
646 sizeof(struct vlan_ioctl_args)))
647 err = -EFAULT;
648 break;
649
650 default:
651 err = -EOPNOTSUPP;
652 break;
653 }
654 out:
655 rtnl_unlock();
656 return err;
657 }
658
659 static int vlan_init_net(struct net *net)
660 {
661 int err;
662 struct vlan_net *vn;
663
664 err = -ENOMEM;
665 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
666 if (vn == NULL)
667 goto err_alloc;
668
669 err = net_assign_generic(net, vlan_net_id, vn);
670 if (err < 0)
671 goto err_assign;
672
673 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
674
675 err = vlan_proc_init(net);
676 if (err < 0)
677 goto err_proc;
678
679 return 0;
680
681 err_proc:
682 /* nothing */
683 err_assign:
684 kfree(vn);
685 err_alloc:
686 return err;
687 }
688
689 static void vlan_exit_net(struct net *net)
690 {
691 struct vlan_net *vn;
692
693 vn = net_generic(net, vlan_net_id);
694 rtnl_kill_links(net, &vlan_link_ops);
695 vlan_proc_cleanup(net);
696 kfree(vn);
697 }
698
699 static struct pernet_operations vlan_net_ops = {
700 .init = vlan_init_net,
701 .exit = vlan_exit_net,
702 };
703
704 static int __init vlan_proto_init(void)
705 {
706 int err;
707
708 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
709 pr_info("All bugs added by %s\n", vlan_buggyright);
710
711 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
712 if (err < 0)
713 goto err0;
714
715 err = register_netdevice_notifier(&vlan_notifier_block);
716 if (err < 0)
717 goto err2;
718
719 err = vlan_gvrp_init();
720 if (err < 0)
721 goto err3;
722
723 err = vlan_netlink_init();
724 if (err < 0)
725 goto err4;
726
727 dev_add_pack(&vlan_packet_type);
728 vlan_ioctl_set(vlan_ioctl_handler);
729 return 0;
730
731 err4:
732 vlan_gvrp_uninit();
733 err3:
734 unregister_netdevice_notifier(&vlan_notifier_block);
735 err2:
736 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
737 err0:
738 return err;
739 }
740
741 static void __exit vlan_cleanup_module(void)
742 {
743 unsigned int i;
744
745 vlan_ioctl_set(NULL);
746 vlan_netlink_fini();
747
748 unregister_netdevice_notifier(&vlan_notifier_block);
749
750 dev_remove_pack(&vlan_packet_type);
751
752 /* This table must be empty if there are no module references left. */
753 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
754 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
755
756 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
757 synchronize_net();
758
759 vlan_gvrp_uninit();
760 }
761
762 module_init(vlan_proto_init);
763 module_exit(vlan_cleanup_module);
764
765 MODULE_LICENSE("GPL");
766 MODULE_VERSION(DRV_VERSION);
Linux kernel - Deliverables
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