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 <linux/capability.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/init.h>
26 #include <linux/rculist.h>
27 #include <net/p8022.h>
28 #include <net/arp.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/notifier.h>
31 #include <net/rtnetlink.h>
32 #include <net/net_namespace.h>
33 #include <net/netns/generic.h>
34 #include <asm/uaccess.h>
35
36 #include <linux/if_vlan.h>
37 #include "vlan.h"
38 #include "vlanproc.h"
39
40 #define DRV_VERSION "1.8"
41
42 /* Global VLAN variables */
43
44 int vlan_net_id;
45
46 /* Our listing of VLAN group(s) */
47 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
48
49 const char vlan_fullname[] = "802.1Q VLAN Support";
50 const char vlan_version[] = DRV_VERSION;
51 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
52 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
53
54 static struct packet_type vlan_packet_type __read_mostly = {
55 .type = cpu_to_be16(ETH_P_8021Q),
56 .func = vlan_skb_recv, /* VLAN receive method */
57 };
58
59 /* End of global variables definitions. */
60
61 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
62 {
63 return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
64 }
65
66 /* Must be invoked with RCU read lock (no preempt) */
67 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
68 {
69 struct vlan_group *grp;
70 struct hlist_node *n;
71 int hash = vlan_grp_hashfn(real_dev->ifindex);
72
73 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
74 if (grp->real_dev == real_dev)
75 return grp;
76 }
77
78 return NULL;
79 }
80
81 /* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
82 *
83 * Must be invoked with RCU read lock (no preempt)
84 */
85 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
86 {
87 struct vlan_group *grp = __vlan_find_group(real_dev);
88
89 if (grp)
90 return vlan_group_get_device(grp, vlan_id);
91
92 return NULL;
93 }
94
95 static void vlan_group_free(struct vlan_group *grp)
96 {
97 int i;
98
99 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
100 kfree(grp->vlan_devices_arrays[i]);
101 kfree(grp);
102 }
103
104 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
105 {
106 struct vlan_group *grp;
107
108 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
109 if (!grp)
110 return NULL;
111
112 grp->real_dev = real_dev;
113 hlist_add_head_rcu(&grp->hlist,
114 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
115 return grp;
116 }
117
118 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
119 {
120 struct net_device **array;
121 unsigned int size;
122
123 ASSERT_RTNL();
124
125 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
126 if (array != NULL)
127 return 0;
128
129 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
130 array = kzalloc(size, GFP_KERNEL);
131 if (array == NULL)
132 return -ENOBUFS;
133
134 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
135 return 0;
136 }
137
138 static void vlan_rcu_free(struct rcu_head *rcu)
139 {
140 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
141 }
142
143 void unregister_vlan_dev(struct net_device *dev)
144 {
145 struct vlan_dev_info *vlan = vlan_dev_info(dev);
146 struct net_device *real_dev = vlan->real_dev;
147 const struct net_device_ops *ops = real_dev->netdev_ops;
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 ops->ndo_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 ops->ndo_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 const char *name = real_dev->name;
210 const struct net_device_ops *ops = real_dev->netdev_ops;
211
212 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
213 pr_info("8021q: VLANs not supported on %s\n", name);
214 return -EOPNOTSUPP;
215 }
216
217 if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_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 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_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 const struct net_device_ops *ops = real_dev->netdev_ops;
245 u16 vlan_id = vlan->vlan_id;
246 struct vlan_group *grp, *ngrp = NULL;
247 int err;
248
249 grp = __vlan_find_group(real_dev);
250 if (!grp) {
251 ngrp = grp = vlan_group_alloc(real_dev);
252 if (!grp)
253 return -ENOBUFS;
254 err = vlan_gvrp_init_applicant(real_dev);
255 if (err < 0)
256 goto out_free_group;
257 }
258
259 err = vlan_group_prealloc_vid(grp, vlan_id);
260 if (err < 0)
261 goto out_uninit_applicant;
262
263 err = register_netdevice(dev);
264 if (err < 0)
265 goto out_uninit_applicant;
266
267 /* Account for reference in struct vlan_dev_info */
268 dev_hold(real_dev);
269
270 vlan_transfer_operstate(real_dev, dev);
271 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
272
273 /* So, got the sucker initialized, now lets place
274 * it into our local structure.
275 */
276 vlan_group_set_device(grp, vlan_id, dev);
277 grp->nr_vlans++;
278
279 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
280 ops->ndo_vlan_rx_register(real_dev, ngrp);
281 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
282 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
283
284 return 0;
285
286 out_uninit_applicant:
287 if (ngrp)
288 vlan_gvrp_uninit_applicant(real_dev);
289 out_free_group:
290 if (ngrp) {
291 hlist_del_rcu(&ngrp->hlist);
292 /* Free the group, after all cpu's are done. */
293 call_rcu(&ngrp->rcu, vlan_rcu_free);
294 }
295 return err;
296 }
297
298 /* Attach a VLAN device to a mac address (ie Ethernet Card).
299 * Returns 0 if the device was created or a negative error code otherwise.
300 */
301 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
302 {
303 struct net_device *new_dev;
304 struct net *net = dev_net(real_dev);
305 struct vlan_net *vn = net_generic(net, vlan_net_id);
306 char name[IFNAMSIZ];
307 int err;
308
309 if (vlan_id >= VLAN_VID_MASK)
310 return -ERANGE;
311
312 err = vlan_check_real_dev(real_dev, vlan_id);
313 if (err < 0)
314 return err;
315
316 /* Gotta set up the fields for the device. */
317 switch (vn->name_type) {
318 case VLAN_NAME_TYPE_RAW_PLUS_VID:
319 /* name will look like: eth1.0005 */
320 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
321 break;
322 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
323 /* Put our vlan.VID in the name.
324 * Name will look like: vlan5
325 */
326 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
327 break;
328 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
329 /* Put our vlan.VID in the name.
330 * Name will look like: eth0.5
331 */
332 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
333 break;
334 case VLAN_NAME_TYPE_PLUS_VID:
335 /* Put our vlan.VID in the name.
336 * Name will look like: vlan0005
337 */
338 default:
339 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
340 }
341
342 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
343 vlan_setup);
344
345 if (new_dev == NULL)
346 return -ENOBUFS;
347
348 dev_net_set(new_dev, net);
349 /* need 4 bytes for extra VLAN header info,
350 * hope the underlying device can handle it.
351 */
352 new_dev->mtu = real_dev->mtu;
353
354 vlan_dev_info(new_dev)->vlan_id = vlan_id;
355 vlan_dev_info(new_dev)->real_dev = real_dev;
356 vlan_dev_info(new_dev)->dent = NULL;
357 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
358
359 new_dev->rtnl_link_ops = &vlan_link_ops;
360 err = register_vlan_dev(new_dev);
361 if (err < 0)
362 goto out_free_newdev;
363
364 return 0;
365
366 out_free_newdev:
367 free_netdev(new_dev);
368 return err;
369 }
370
371 static void vlan_sync_address(struct net_device *dev,
372 struct net_device *vlandev)
373 {
374 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
375
376 /* May be called without an actual change */
377 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
378 return;
379
380 /* vlan address was different from the old address and is equal to
381 * the new address */
382 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
383 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
384 dev_unicast_delete(dev, vlandev->dev_addr);
385
386 /* vlan address was equal to the old address and is different from
387 * the new address */
388 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
389 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
390 dev_unicast_add(dev, vlandev->dev_addr);
391
392 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
393 }
394
395 static void vlan_transfer_features(struct net_device *dev,
396 struct net_device *vlandev)
397 {
398 unsigned long old_features = vlandev->features;
399
400 vlandev->features &= ~dev->vlan_features;
401 vlandev->features |= dev->features & dev->vlan_features;
402 vlandev->gso_max_size = dev->gso_max_size;
403
404 if (old_features != vlandev->features)
405 netdev_features_change(vlandev);
406 }
407
408 static void __vlan_device_event(struct net_device *dev, unsigned long event)
409 {
410 switch (event) {
411 case NETDEV_CHANGENAME:
412 vlan_proc_rem_dev(dev);
413 if (vlan_proc_add_dev(dev) < 0)
414 pr_warning("8021q: failed to change proc name for %s\n",
415 dev->name);
416 break;
417 case NETDEV_REGISTER:
418 if (vlan_proc_add_dev(dev) < 0)
419 pr_warning("8021q: failed to add proc entry for %s\n",
420 dev->name);
421 break;
422 case NETDEV_UNREGISTER:
423 vlan_proc_rem_dev(dev);
424 break;
425 }
426 }
427
428 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
429 void *ptr)
430 {
431 struct net_device *dev = ptr;
432 struct vlan_group *grp;
433 int i, flgs;
434 struct net_device *vlandev;
435
436 if (is_vlan_dev(dev))
437 __vlan_device_event(dev, event);
438
439 grp = __vlan_find_group(dev);
440 if (!grp)
441 goto out;
442
443 /* It is OK that we do not hold the group lock right now,
444 * as we run under the RTNL lock.
445 */
446
447 switch (event) {
448 case NETDEV_CHANGE:
449 /* Propagate real device state to vlan devices */
450 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
451 vlandev = vlan_group_get_device(grp, i);
452 if (!vlandev)
453 continue;
454
455 vlan_transfer_operstate(dev, vlandev);
456 }
457 break;
458
459 case NETDEV_CHANGEADDR:
460 /* Adjust unicast filters on underlying device */
461 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
462 vlandev = vlan_group_get_device(grp, i);
463 if (!vlandev)
464 continue;
465
466 flgs = vlandev->flags;
467 if (!(flgs & IFF_UP))
468 continue;
469
470 vlan_sync_address(dev, vlandev);
471 }
472 break;
473
474 case NETDEV_FEAT_CHANGE:
475 /* Propagate device features to underlying device */
476 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
477 vlandev = vlan_group_get_device(grp, i);
478 if (!vlandev)
479 continue;
480
481 vlan_transfer_features(dev, vlandev);
482 }
483
484 break;
485
486 case NETDEV_DOWN:
487 /* Put all VLANs for this dev in the down state too. */
488 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
489 vlandev = vlan_group_get_device(grp, i);
490 if (!vlandev)
491 continue;
492
493 flgs = vlandev->flags;
494 if (!(flgs & IFF_UP))
495 continue;
496
497 dev_change_flags(vlandev, flgs & ~IFF_UP);
498 vlan_transfer_operstate(dev, vlandev);
499 }
500 break;
501
502 case NETDEV_UP:
503 /* Put all VLANs for this dev in the up state too. */
504 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
505 vlandev = vlan_group_get_device(grp, i);
506 if (!vlandev)
507 continue;
508
509 flgs = vlandev->flags;
510 if (flgs & IFF_UP)
511 continue;
512
513 dev_change_flags(vlandev, flgs | IFF_UP);
514 vlan_transfer_operstate(dev, vlandev);
515 }
516 break;
517
518 case NETDEV_UNREGISTER:
519 /* Delete all VLANs for this dev. */
520 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
521 vlandev = vlan_group_get_device(grp, i);
522 if (!vlandev)
523 continue;
524
525 /* unregistration of last vlan destroys group, abort
526 * afterwards */
527 if (grp->nr_vlans == 1)
528 i = VLAN_GROUP_ARRAY_LEN;
529
530 unregister_vlan_dev(vlandev);
531 }
532 break;
533 }
534
535 out:
536 return NOTIFY_DONE;
537 }
538
539 static struct notifier_block vlan_notifier_block __read_mostly = {
540 .notifier_call = vlan_device_event,
541 };
542
543 /*
544 * VLAN IOCTL handler.
545 * o execute requested action or pass command to the device driver
546 * arg is really a struct vlan_ioctl_args __user *.
547 */
548 static int vlan_ioctl_handler(struct net *net, void __user *arg)
549 {
550 int err;
551 struct vlan_ioctl_args args;
552 struct net_device *dev = NULL;
553
554 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
555 return -EFAULT;
556
557 /* Null terminate this sucker, just in case. */
558 args.device1[23] = 0;
559 args.u.device2[23] = 0;
560
561 rtnl_lock();
562
563 switch (args.cmd) {
564 case SET_VLAN_INGRESS_PRIORITY_CMD:
565 case SET_VLAN_EGRESS_PRIORITY_CMD:
566 case SET_VLAN_FLAG_CMD:
567 case ADD_VLAN_CMD:
568 case DEL_VLAN_CMD:
569 case GET_VLAN_REALDEV_NAME_CMD:
570 case GET_VLAN_VID_CMD:
571 err = -ENODEV;
572 dev = __dev_get_by_name(net, args.device1);
573 if (!dev)
574 goto out;
575
576 err = -EINVAL;
577 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
578 goto out;
579 }
580
581 switch (args.cmd) {
582 case SET_VLAN_INGRESS_PRIORITY_CMD:
583 err = -EPERM;
584 if (!capable(CAP_NET_ADMIN))
585 break;
586 vlan_dev_set_ingress_priority(dev,
587 args.u.skb_priority,
588 args.vlan_qos);
589 err = 0;
590 break;
591
592 case SET_VLAN_EGRESS_PRIORITY_CMD:
593 err = -EPERM;
594 if (!capable(CAP_NET_ADMIN))
595 break;
596 err = vlan_dev_set_egress_priority(dev,
597 args.u.skb_priority,
598 args.vlan_qos);
599 break;
600
601 case SET_VLAN_FLAG_CMD:
602 err = -EPERM;
603 if (!capable(CAP_NET_ADMIN))
604 break;
605 err = vlan_dev_change_flags(dev,
606 args.vlan_qos ? args.u.flag : 0,
607 args.u.flag);
608 break;
609
610 case SET_VLAN_NAME_TYPE_CMD:
611 err = -EPERM;
612 if (!capable(CAP_NET_ADMIN))
613 break;
614 if ((args.u.name_type >= 0) &&
615 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
616 struct vlan_net *vn;
617
618 vn = net_generic(net, vlan_net_id);
619 vn->name_type = args.u.name_type;
620 err = 0;
621 } else {
622 err = -EINVAL;
623 }
624 break;
625
626 case ADD_VLAN_CMD:
627 err = -EPERM;
628 if (!capable(CAP_NET_ADMIN))
629 break;
630 err = register_vlan_device(dev, args.u.VID);
631 break;
632
633 case DEL_VLAN_CMD:
634 err = -EPERM;
635 if (!capable(CAP_NET_ADMIN))
636 break;
637 unregister_vlan_dev(dev);
638 err = 0;
639 break;
640
641 case GET_VLAN_REALDEV_NAME_CMD:
642 err = 0;
643 vlan_dev_get_realdev_name(dev, args.u.device2);
644 if (copy_to_user(arg, &args,
645 sizeof(struct vlan_ioctl_args)))
646 err = -EFAULT;
647 break;
648
649 case GET_VLAN_VID_CMD:
650 err = 0;
651 args.u.VID = vlan_dev_vlan_id(dev);
652 if (copy_to_user(arg, &args,
653 sizeof(struct vlan_ioctl_args)))
654 err = -EFAULT;
655 break;
656
657 default:
658 err = -EOPNOTSUPP;
659 break;
660 }
661 out:
662 rtnl_unlock();
663 return err;
664 }
665
666 static int vlan_init_net(struct net *net)
667 {
668 int err;
669 struct vlan_net *vn;
670
671 err = -ENOMEM;
672 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
673 if (vn == NULL)
674 goto err_alloc;
675
676 err = net_assign_generic(net, vlan_net_id, vn);
677 if (err < 0)
678 goto err_assign;
679
680 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
681
682 err = vlan_proc_init(net);
683 if (err < 0)
684 goto err_proc;
685
686 return 0;
687
688 err_proc:
689 /* nothing */
690 err_assign:
691 kfree(vn);
692 err_alloc:
693 return err;
694 }
695
696 static void vlan_exit_net(struct net *net)
697 {
698 struct vlan_net *vn;
699
700 vn = net_generic(net, vlan_net_id);
701 rtnl_kill_links(net, &vlan_link_ops);
702 vlan_proc_cleanup(net);
703 kfree(vn);
704 }
705
706 static struct pernet_operations vlan_net_ops = {
707 .init = vlan_init_net,
708 .exit = vlan_exit_net,
709 };
710
711 static int __init vlan_proto_init(void)
712 {
713 int err;
714
715 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
716 pr_info("All bugs added by %s\n", vlan_buggyright);
717
718 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
719 if (err < 0)
720 goto err0;
721
722 err = register_netdevice_notifier(&vlan_notifier_block);
723 if (err < 0)
724 goto err2;
725
726 err = vlan_gvrp_init();
727 if (err < 0)
728 goto err3;
729
730 err = vlan_netlink_init();
731 if (err < 0)
732 goto err4;
733
734 dev_add_pack(&vlan_packet_type);
735 vlan_ioctl_set(vlan_ioctl_handler);
736 return 0;
737
738 err4:
739 vlan_gvrp_uninit();
740 err3:
741 unregister_netdevice_notifier(&vlan_notifier_block);
742 err2:
743 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
744 err0:
745 return err;
746 }
747
748 static void __exit vlan_cleanup_module(void)
749 {
750 unsigned int i;
751
752 vlan_ioctl_set(NULL);
753 vlan_netlink_fini();
754
755 unregister_netdevice_notifier(&vlan_notifier_block);
756
757 dev_remove_pack(&vlan_packet_type);
758
759 /* This table must be empty if there are no module references left. */
760 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
761 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
762
763 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
764 rcu_barrier(); /* Wait for completion of call_rcu()'s */
765
766 vlan_gvrp_uninit();
767 }
768
769 module_init(vlan_proto_init);
770 module_exit(vlan_cleanup_module);
771
772 MODULE_LICENSE("GPL");
773 MODULE_VERSION(DRV_VERSION);
774
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