Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 22 
 23 #include <linux/capability.h>
 24 #include <linux/module.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/skbuff.h>
 27 #include <linux/slab.h>
 28 #include <linux/init.h>
 29 #include <linux/rculist.h>
 30 #include <net/p8022.h>
 31 #include <net/arp.h>
 32 #include <linux/rtnetlink.h>
 33 #include <linux/notifier.h>
 34 #include <net/rtnetlink.h>
 35 #include <net/net_namespace.h>
 36 #include <net/netns/generic.h>
 37 #include <asm/uaccess.h>
 38 
 39 #include <linux/if_vlan.h>
 40 #include "vlan.h"
 41 #include "vlanproc.h"
 42 
 43 #define DRV_VERSION "1.8"
 44 
 45 /* Global VLAN variables */
 46 
 47 int vlan_net_id __read_mostly;
 48 
 49 const char vlan_fullname[] = "802.1Q VLAN Support";
 50 const char vlan_version[] = DRV_VERSION;
 51 
 52 /* End of global variables definitions. */
 53 
 54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
 55                                    __be16 vlan_proto, u16 vlan_id)
 56 {
 57         struct net_device **array;
 58         unsigned int pidx, vidx;
 59         unsigned int size;
 60 
 61         ASSERT_RTNL();
 62 
 63         pidx  = vlan_proto_idx(vlan_proto);
 64         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
 65         array = vg->vlan_devices_arrays[pidx][vidx];
 66         if (array != NULL)
 67                 return 0;
 68 
 69         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 70         array = kzalloc(size, GFP_KERNEL);
 71         if (array == NULL)
 72                 return -ENOBUFS;
 73 
 74         vg->vlan_devices_arrays[pidx][vidx] = array;
 75         return 0;
 76 }
 77 
 78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 79 {
 80         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 81         struct net_device *real_dev = vlan->real_dev;
 82         struct vlan_info *vlan_info;
 83         struct vlan_group *grp;
 84         u16 vlan_id = vlan->vlan_id;
 85 
 86         ASSERT_RTNL();
 87 
 88         vlan_info = rtnl_dereference(real_dev->vlan_info);
 89         BUG_ON(!vlan_info);
 90 
 91         grp = &vlan_info->grp;
 92 
 93         grp->nr_vlan_devs--;
 94 
 95         if (vlan->flags & VLAN_FLAG_MVRP)
 96                 vlan_mvrp_request_leave(dev);
 97         if (vlan->flags & VLAN_FLAG_GVRP)
 98                 vlan_gvrp_request_leave(dev);
 99 
100         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
101 
102         netdev_upper_dev_unlink(real_dev, dev);
103         /* Because unregister_netdevice_queue() makes sure at least one rcu
104          * grace period is respected before device freeing,
105          * we dont need to call synchronize_net() here.
106          */
107         unregister_netdevice_queue(dev, head);
108 
109         if (grp->nr_vlan_devs == 0) {
110                 vlan_mvrp_uninit_applicant(real_dev);
111                 vlan_gvrp_uninit_applicant(real_dev);
112         }
113 
114         /* Take it out of our own structures, but be sure to interlock with
115          * HW accelerating devices or SW vlan input packet processing if
116          * VLAN is not 0 (leave it there for 802.1p).
117          */
118         if (vlan_id)
119                 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
120 
121         /* Get rid of the vlan's reference to real_dev */
122         dev_put(real_dev);
123 }
124 
125 int vlan_check_real_dev(struct net_device *real_dev,
126                         __be16 protocol, u16 vlan_id)
127 {
128         const char *name = real_dev->name;
129 
130         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
131                 pr_info("VLANs not supported on %s\n", name);
132                 return -EOPNOTSUPP;
133         }
134 
135         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL)
136                 return -EEXIST;
137 
138         return 0;
139 }
140 
141 int register_vlan_dev(struct net_device *dev)
142 {
143         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
144         struct net_device *real_dev = vlan->real_dev;
145         u16 vlan_id = vlan->vlan_id;
146         struct vlan_info *vlan_info;
147         struct vlan_group *grp;
148         int err;
149 
150         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
151         if (err)
152                 return err;
153 
154         vlan_info = rtnl_dereference(real_dev->vlan_info);
155         /* vlan_info should be there now. vlan_vid_add took care of it */
156         BUG_ON(!vlan_info);
157 
158         grp = &vlan_info->grp;
159         if (grp->nr_vlan_devs == 0) {
160                 err = vlan_gvrp_init_applicant(real_dev);
161                 if (err < 0)
162                         goto out_vid_del;
163                 err = vlan_mvrp_init_applicant(real_dev);
164                 if (err < 0)
165                         goto out_uninit_gvrp;
166         }
167 
168         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
169         if (err < 0)
170                 goto out_uninit_mvrp;
171 
172         vlan->nest_level = dev_get_nest_level(real_dev, is_vlan_dev) + 1;
173         err = register_netdevice(dev);
174         if (err < 0)
175                 goto out_uninit_mvrp;
176 
177         err = netdev_upper_dev_link(real_dev, dev);
178         if (err)
179                 goto out_unregister_netdev;
180 
181         /* Account for reference in struct vlan_dev_priv */
182         dev_hold(real_dev);
183 
184         netif_stacked_transfer_operstate(real_dev, dev);
185         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
186 
187         /* So, got the sucker initialized, now lets place
188          * it into our local structure.
189          */
190         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
191         grp->nr_vlan_devs++;
192 
193         return 0;
194 
195 out_unregister_netdev:
196         unregister_netdevice(dev);
197 out_uninit_mvrp:
198         if (grp->nr_vlan_devs == 0)
199                 vlan_mvrp_uninit_applicant(real_dev);
200 out_uninit_gvrp:
201         if (grp->nr_vlan_devs == 0)
202                 vlan_gvrp_uninit_applicant(real_dev);
203 out_vid_del:
204         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
205         return err;
206 }
207 
208 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
209  *  Returns 0 if the device was created or a negative error code otherwise.
210  */
211 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
212 {
213         struct net_device *new_dev;
214         struct vlan_dev_priv *vlan;
215         struct net *net = dev_net(real_dev);
216         struct vlan_net *vn = net_generic(net, vlan_net_id);
217         char name[IFNAMSIZ];
218         int err;
219 
220         if (vlan_id >= VLAN_VID_MASK)
221                 return -ERANGE;
222 
223         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
224         if (err < 0)
225                 return err;
226 
227         /* Gotta set up the fields for the device. */
228         switch (vn->name_type) {
229         case VLAN_NAME_TYPE_RAW_PLUS_VID:
230                 /* name will look like:  eth1.0005 */
231                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
232                 break;
233         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
234                 /* Put our vlan.VID in the name.
235                  * Name will look like:  vlan5
236                  */
237                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
238                 break;
239         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
240                 /* Put our vlan.VID in the name.
241                  * Name will look like:  eth0.5
242                  */
243                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
244                 break;
245         case VLAN_NAME_TYPE_PLUS_VID:
246                 /* Put our vlan.VID in the name.
247                  * Name will look like:  vlan0005
248                  */
249         default:
250                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
251         }
252 
253         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
254 
255         if (new_dev == NULL)
256                 return -ENOBUFS;
257 
258         dev_net_set(new_dev, net);
259         /* need 4 bytes for extra VLAN header info,
260          * hope the underlying device can handle it.
261          */
262         new_dev->mtu = real_dev->mtu;
263         new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
264 
265         vlan = vlan_dev_priv(new_dev);
266         vlan->vlan_proto = htons(ETH_P_8021Q);
267         vlan->vlan_id = vlan_id;
268         vlan->real_dev = real_dev;
269         vlan->dent = NULL;
270         vlan->flags = VLAN_FLAG_REORDER_HDR;
271 
272         new_dev->rtnl_link_ops = &vlan_link_ops;
273         err = register_vlan_dev(new_dev);
274         if (err < 0)
275                 goto out_free_newdev;
276 
277         return 0;
278 
279 out_free_newdev:
280         free_netdev(new_dev);
281         return err;
282 }
283 
284 static void vlan_sync_address(struct net_device *dev,
285                               struct net_device *vlandev)
286 {
287         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
288 
289         /* May be called without an actual change */
290         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
291                 return;
292 
293         /* vlan address was different from the old address and is equal to
294          * the new address */
295         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
296             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
297                 dev_uc_del(dev, vlandev->dev_addr);
298 
299         /* vlan address was equal to the old address and is different from
300          * the new address */
301         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
302             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
303                 dev_uc_add(dev, vlandev->dev_addr);
304 
305         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
306 }
307 
308 static void vlan_transfer_features(struct net_device *dev,
309                                    struct net_device *vlandev)
310 {
311         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
312 
313         vlandev->gso_max_size = dev->gso_max_size;
314 
315         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
316                 vlandev->hard_header_len = dev->hard_header_len;
317         else
318                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
319 
320 #if IS_ENABLED(CONFIG_FCOE)
321         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
322 #endif
323 
324         netdev_update_features(vlandev);
325 }
326 
327 static void __vlan_device_event(struct net_device *dev, unsigned long event)
328 {
329         switch (event) {
330         case NETDEV_CHANGENAME:
331                 vlan_proc_rem_dev(dev);
332                 if (vlan_proc_add_dev(dev) < 0)
333                         pr_warn("failed to change proc name for %s\n",
334                                 dev->name);
335                 break;
336         case NETDEV_REGISTER:
337                 if (vlan_proc_add_dev(dev) < 0)
338                         pr_warn("failed to add proc entry for %s\n", dev->name);
339                 break;
340         case NETDEV_UNREGISTER:
341                 vlan_proc_rem_dev(dev);
342                 break;
343         }
344 }
345 
346 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
347                              void *ptr)
348 {
349         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
350         struct vlan_group *grp;
351         struct vlan_info *vlan_info;
352         int i, flgs;
353         struct net_device *vlandev;
354         struct vlan_dev_priv *vlan;
355         bool last = false;
356         LIST_HEAD(list);
357 
358         if (is_vlan_dev(dev))
359                 __vlan_device_event(dev, event);
360 
361         if ((event == NETDEV_UP) &&
362             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
363                 pr_info("adding VLAN 0 to HW filter on device %s\n",
364                         dev->name);
365                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
366         }
367 
368         vlan_info = rtnl_dereference(dev->vlan_info);
369         if (!vlan_info)
370                 goto out;
371         grp = &vlan_info->grp;
372 
373         /* It is OK that we do not hold the group lock right now,
374          * as we run under the RTNL lock.
375          */
376 
377         switch (event) {
378         case NETDEV_CHANGE:
379                 /* Propagate real device state to vlan devices */
380                 vlan_group_for_each_dev(grp, i, vlandev)
381                         netif_stacked_transfer_operstate(dev, vlandev);
382                 break;
383 
384         case NETDEV_CHANGEADDR:
385                 /* Adjust unicast filters on underlying device */
386                 vlan_group_for_each_dev(grp, i, vlandev) {
387                         flgs = vlandev->flags;
388                         if (!(flgs & IFF_UP))
389                                 continue;
390 
391                         vlan_sync_address(dev, vlandev);
392                 }
393                 break;
394 
395         case NETDEV_CHANGEMTU:
396                 vlan_group_for_each_dev(grp, i, vlandev) {
397                         if (vlandev->mtu <= dev->mtu)
398                                 continue;
399 
400                         dev_set_mtu(vlandev, dev->mtu);
401                 }
402                 break;
403 
404         case NETDEV_FEAT_CHANGE:
405                 /* Propagate device features to underlying device */
406                 vlan_group_for_each_dev(grp, i, vlandev)
407                         vlan_transfer_features(dev, vlandev);
408                 break;
409 
410         case NETDEV_DOWN:
411                 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
412                         vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
413 
414                 /* Put all VLANs for this dev in the down state too.  */
415                 vlan_group_for_each_dev(grp, i, vlandev) {
416                         flgs = vlandev->flags;
417                         if (!(flgs & IFF_UP))
418                                 continue;
419 
420                         vlan = vlan_dev_priv(vlandev);
421                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
422                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
423                         netif_stacked_transfer_operstate(dev, vlandev);
424                 }
425                 break;
426 
427         case NETDEV_UP:
428                 /* Put all VLANs for this dev in the up state too.  */
429                 vlan_group_for_each_dev(grp, i, vlandev) {
430                         flgs = vlandev->flags;
431                         if (flgs & IFF_UP)
432                                 continue;
433 
434                         vlan = vlan_dev_priv(vlandev);
435                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
436                                 dev_change_flags(vlandev, flgs | IFF_UP);
437                         netif_stacked_transfer_operstate(dev, vlandev);
438                 }
439                 break;
440 
441         case NETDEV_UNREGISTER:
442                 /* twiddle thumbs on netns device moves */
443                 if (dev->reg_state != NETREG_UNREGISTERING)
444                         break;
445 
446                 vlan_group_for_each_dev(grp, i, vlandev) {
447                         /* removal of last vid destroys vlan_info, abort
448                          * afterwards */
449                         if (vlan_info->nr_vids == 1)
450                                 last = true;
451 
452                         unregister_vlan_dev(vlandev, &list);
453                         if (last)
454                                 break;
455                 }
456                 unregister_netdevice_many(&list);
457                 break;
458 
459         case NETDEV_PRE_TYPE_CHANGE:
460                 /* Forbid underlaying device to change its type. */
461                 if (vlan_uses_dev(dev))
462                         return NOTIFY_BAD;
463                 break;
464 
465         case NETDEV_NOTIFY_PEERS:
466         case NETDEV_BONDING_FAILOVER:
467         case NETDEV_RESEND_IGMP:
468                 /* Propagate to vlan devices */
469                 vlan_group_for_each_dev(grp, i, vlandev)
470                         call_netdevice_notifiers(event, vlandev);
471                 break;
472         }
473 
474 out:
475         return NOTIFY_DONE;
476 }
477 
478 static struct notifier_block vlan_notifier_block __read_mostly = {
479         .notifier_call = vlan_device_event,
480 };
481 
482 /*
483  *      VLAN IOCTL handler.
484  *      o execute requested action or pass command to the device driver
485  *   arg is really a struct vlan_ioctl_args __user *.
486  */
487 static int vlan_ioctl_handler(struct net *net, void __user *arg)
488 {
489         int err;
490         struct vlan_ioctl_args args;
491         struct net_device *dev = NULL;
492 
493         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
494                 return -EFAULT;
495 
496         /* Null terminate this sucker, just in case. */
497         args.device1[23] = 0;
498         args.u.device2[23] = 0;
499 
500         rtnl_lock();
501 
502         switch (args.cmd) {
503         case SET_VLAN_INGRESS_PRIORITY_CMD:
504         case SET_VLAN_EGRESS_PRIORITY_CMD:
505         case SET_VLAN_FLAG_CMD:
506         case ADD_VLAN_CMD:
507         case DEL_VLAN_CMD:
508         case GET_VLAN_REALDEV_NAME_CMD:
509         case GET_VLAN_VID_CMD:
510                 err = -ENODEV;
511                 dev = __dev_get_by_name(net, args.device1);
512                 if (!dev)
513                         goto out;
514 
515                 err = -EINVAL;
516                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
517                         goto out;
518         }
519 
520         switch (args.cmd) {
521         case SET_VLAN_INGRESS_PRIORITY_CMD:
522                 err = -EPERM;
523                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
524                         break;
525                 vlan_dev_set_ingress_priority(dev,
526                                               args.u.skb_priority,
527                                               args.vlan_qos);
528                 err = 0;
529                 break;
530 
531         case SET_VLAN_EGRESS_PRIORITY_CMD:
532                 err = -EPERM;
533                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
534                         break;
535                 err = vlan_dev_set_egress_priority(dev,
536                                                    args.u.skb_priority,
537                                                    args.vlan_qos);
538                 break;
539 
540         case SET_VLAN_FLAG_CMD:
541                 err = -EPERM;
542                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
543                         break;
544                 err = vlan_dev_change_flags(dev,
545                                             args.vlan_qos ? args.u.flag : 0,
546                                             args.u.flag);
547                 break;
548 
549         case SET_VLAN_NAME_TYPE_CMD:
550                 err = -EPERM;
551                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
552                         break;
553                 if ((args.u.name_type >= 0) &&
554                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
555                         struct vlan_net *vn;
556 
557                         vn = net_generic(net, vlan_net_id);
558                         vn->name_type = args.u.name_type;
559                         err = 0;
560                 } else {
561                         err = -EINVAL;
562                 }
563                 break;
564 
565         case ADD_VLAN_CMD:
566                 err = -EPERM;
567                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
568                         break;
569                 err = register_vlan_device(dev, args.u.VID);
570                 break;
571 
572         case DEL_VLAN_CMD:
573                 err = -EPERM;
574                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
575                         break;
576                 unregister_vlan_dev(dev, NULL);
577                 err = 0;
578                 break;
579 
580         case GET_VLAN_REALDEV_NAME_CMD:
581                 err = 0;
582                 vlan_dev_get_realdev_name(dev, args.u.device2);
583                 if (copy_to_user(arg, &args,
584                                  sizeof(struct vlan_ioctl_args)))
585                         err = -EFAULT;
586                 break;
587 
588         case GET_VLAN_VID_CMD:
589                 err = 0;
590                 args.u.VID = vlan_dev_vlan_id(dev);
591                 if (copy_to_user(arg, &args,
592                                  sizeof(struct vlan_ioctl_args)))
593                       err = -EFAULT;
594                 break;
595 
596         default:
597                 err = -EOPNOTSUPP;
598                 break;
599         }
600 out:
601         rtnl_unlock();
602         return err;
603 }
604 
605 static int __net_init vlan_init_net(struct net *net)
606 {
607         struct vlan_net *vn = net_generic(net, vlan_net_id);
608         int err;
609 
610         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
611 
612         err = vlan_proc_init(net);
613 
614         return err;
615 }
616 
617 static void __net_exit vlan_exit_net(struct net *net)
618 {
619         vlan_proc_cleanup(net);
620 }
621 
622 static struct pernet_operations vlan_net_ops = {
623         .init = vlan_init_net,
624         .exit = vlan_exit_net,
625         .id   = &vlan_net_id,
626         .size = sizeof(struct vlan_net),
627 };
628 
629 static int __init vlan_proto_init(void)
630 {
631         int err;
632 
633         pr_info("%s v%s\n", vlan_fullname, vlan_version);
634 
635         err = register_pernet_subsys(&vlan_net_ops);
636         if (err < 0)
637                 goto err0;
638 
639         err = register_netdevice_notifier(&vlan_notifier_block);
640         if (err < 0)
641                 goto err2;
642 
643         err = vlan_gvrp_init();
644         if (err < 0)
645                 goto err3;
646 
647         err = vlan_mvrp_init();
648         if (err < 0)
649                 goto err4;
650 
651         err = vlan_netlink_init();
652         if (err < 0)
653                 goto err5;
654 
655         vlan_ioctl_set(vlan_ioctl_handler);
656         return 0;
657 
658 err5:
659         vlan_mvrp_uninit();
660 err4:
661         vlan_gvrp_uninit();
662 err3:
663         unregister_netdevice_notifier(&vlan_notifier_block);
664 err2:
665         unregister_pernet_subsys(&vlan_net_ops);
666 err0:
667         return err;
668 }
669 
670 static void __exit vlan_cleanup_module(void)
671 {
672         vlan_ioctl_set(NULL);
673         vlan_netlink_fini();
674 
675         unregister_netdevice_notifier(&vlan_notifier_block);
676 
677         unregister_pernet_subsys(&vlan_net_ops);
678         rcu_barrier(); /* Wait for completion of call_rcu()'s */
679 
680         vlan_mvrp_uninit();
681         vlan_gvrp_uninit();
682 }
683 
684 module_init(vlan_proto_init);
685 module_exit(vlan_cleanup_module);
686 
687 MODULE_LICENSE("GPL");
688 MODULE_VERSION(DRV_VERSION);
689 

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