1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * INET 802.1Q VLAN
4 * Ethernet-type device handling.
5 *
6 * Authors: Ben Greear <greearb@candelatech.com>
7 * Please send support related email to: netdev@vger.kernel.org
8 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
9 *
10 * Fixes:
11 * Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
12 * Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
13 * Correct all the locking - David S. Miller <davem@redhat.com>;
14 * Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
15 */
16
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <linux/capability.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/rculist.h>
26 #include <net/p8022.h>
27 #include <net/arp.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/notifier.h>
30 #include <net/rtnetlink.h>
31 #include <net/net_namespace.h>
32 #include <net/netns/generic.h>
33 #include <linux/uaccess.h>
34
35 #include <linux/if_vlan.h>
36 #include "vlan.h"
37 #include "vlanproc.h"
38
39 #define DRV_VERSION "1.8"
40
41 /* Global VLAN variables */
42
43 unsigned int vlan_net_id __read_mostly;
44
45 const char vlan_fullname[] = "802.1Q VLAN Support";
46 const char vlan_version[] = DRV_VERSION;
47
48 /* End of global variables definitions. */
49
vlan_group_prealloc_vid(struct vlan_group * vg,__be16 vlan_proto,u16 vlan_id)50 static int vlan_group_prealloc_vid(struct vlan_group *vg,
51 __be16 vlan_proto, u16 vlan_id)
52 {
53 struct net_device **array;
54 unsigned int vidx;
55 unsigned int size;
56 int pidx;
57
58 ASSERT_RTNL();
59
60 pidx = vlan_proto_idx(vlan_proto);
61 if (pidx < 0)
62 return -EINVAL;
63
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_ACCOUNT);
71 if (array == NULL)
72 return -ENOBUFS;
73
74 /* paired with smp_rmb() in __vlan_group_get_device() */
75 smp_wmb();
76
77 vg->vlan_devices_arrays[pidx][vidx] = array;
78 return 0;
79 }
80
vlan_stacked_transfer_operstate(const struct net_device * rootdev,struct net_device * dev,struct vlan_dev_priv * vlan)81 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
82 struct net_device *dev,
83 struct vlan_dev_priv *vlan)
84 {
85 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
86 netif_stacked_transfer_operstate(rootdev, dev);
87 }
88
unregister_vlan_dev(struct net_device * dev,struct list_head * head)89 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
90 {
91 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
92 struct net_device *real_dev = vlan->real_dev;
93 struct vlan_info *vlan_info;
94 struct vlan_group *grp;
95 u16 vlan_id = vlan->vlan_id;
96
97 ASSERT_RTNL();
98
99 vlan_info = rtnl_dereference(real_dev->vlan_info);
100 BUG_ON(!vlan_info);
101
102 grp = &vlan_info->grp;
103
104 grp->nr_vlan_devs--;
105
106 if (vlan->flags & VLAN_FLAG_MVRP)
107 vlan_mvrp_request_leave(dev);
108 if (vlan->flags & VLAN_FLAG_GVRP)
109 vlan_gvrp_request_leave(dev);
110
111 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
112
113 netdev_upper_dev_unlink(real_dev, dev);
114 /* Because unregister_netdevice_queue() makes sure at least one rcu
115 * grace period is respected before device freeing,
116 * we dont need to call synchronize_net() here.
117 */
118 unregister_netdevice_queue(dev, head);
119
120 if (grp->nr_vlan_devs == 0) {
121 vlan_mvrp_uninit_applicant(real_dev);
122 vlan_gvrp_uninit_applicant(real_dev);
123 }
124
125 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
126 }
127
vlan_check_real_dev(struct net_device * real_dev,__be16 protocol,u16 vlan_id,struct netlink_ext_ack * extack)128 int vlan_check_real_dev(struct net_device *real_dev,
129 __be16 protocol, u16 vlan_id,
130 struct netlink_ext_ack *extack)
131 {
132 const char *name = real_dev->name;
133
134 if (real_dev->features & NETIF_F_VLAN_CHALLENGED ||
135 real_dev->type != ARPHRD_ETHER) {
136 pr_info("VLANs not supported on %s\n", name);
137 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
138 return -EOPNOTSUPP;
139 }
140
141 if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
142 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
143 return -EEXIST;
144 }
145
146 return 0;
147 }
148
register_vlan_dev(struct net_device * dev,struct netlink_ext_ack * extack)149 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
150 {
151 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
152 struct net_device *real_dev = vlan->real_dev;
153 u16 vlan_id = vlan->vlan_id;
154 struct vlan_info *vlan_info;
155 struct vlan_group *grp;
156 int err;
157
158 err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
159 if (err)
160 return err;
161
162 vlan_info = rtnl_dereference(real_dev->vlan_info);
163 /* vlan_info should be there now. vlan_vid_add took care of it */
164 BUG_ON(!vlan_info);
165
166 grp = &vlan_info->grp;
167 if (grp->nr_vlan_devs == 0) {
168 err = vlan_gvrp_init_applicant(real_dev);
169 if (err < 0)
170 goto out_vid_del;
171 err = vlan_mvrp_init_applicant(real_dev);
172 if (err < 0)
173 goto out_uninit_gvrp;
174 }
175
176 err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
177 if (err < 0)
178 goto out_uninit_mvrp;
179
180 err = register_netdevice(dev);
181 if (err < 0)
182 goto out_uninit_mvrp;
183
184 err = netdev_upper_dev_link(real_dev, dev, extack);
185 if (err)
186 goto out_unregister_netdev;
187
188 vlan_stacked_transfer_operstate(real_dev, dev, vlan);
189 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
190
191 /* So, got the sucker initialized, now lets place
192 * it into our local structure.
193 */
194 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
195 grp->nr_vlan_devs++;
196
197 return 0;
198
199 out_unregister_netdev:
200 unregister_netdevice(dev);
201 out_uninit_mvrp:
202 if (grp->nr_vlan_devs == 0)
203 vlan_mvrp_uninit_applicant(real_dev);
204 out_uninit_gvrp:
205 if (grp->nr_vlan_devs == 0)
206 vlan_gvrp_uninit_applicant(real_dev);
207 out_vid_del:
208 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
209 return err;
210 }
211
212 /* Attach a VLAN device to a mac address (ie Ethernet Card).
213 * Returns 0 if the device was created or a negative error code otherwise.
214 */
register_vlan_device(struct net_device * real_dev,u16 vlan_id)215 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
216 {
217 struct net_device *new_dev;
218 struct vlan_dev_priv *vlan;
219 struct net *net = dev_net(real_dev);
220 struct vlan_net *vn = net_generic(net, vlan_net_id);
221 char name[IFNAMSIZ];
222 int err;
223
224 if (vlan_id >= VLAN_VID_MASK)
225 return -ERANGE;
226
227 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
228 NULL);
229 if (err < 0)
230 return err;
231
232 /* Gotta set up the fields for the device. */
233 switch (vn->name_type) {
234 case VLAN_NAME_TYPE_RAW_PLUS_VID:
235 /* name will look like: eth1.0005 */
236 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
237 break;
238 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
239 /* Put our vlan.VID in the name.
240 * Name will look like: vlan5
241 */
242 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
243 break;
244 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
245 /* Put our vlan.VID in the name.
246 * Name will look like: eth0.5
247 */
248 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
249 break;
250 case VLAN_NAME_TYPE_PLUS_VID:
251 /* Put our vlan.VID in the name.
252 * Name will look like: vlan0005
253 */
254 default:
255 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
256 }
257
258 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
259 NET_NAME_UNKNOWN, vlan_setup);
260
261 if (new_dev == NULL)
262 return -ENOBUFS;
263
264 dev_net_set(new_dev, net);
265 /* need 4 bytes for extra VLAN header info,
266 * hope the underlying device can handle it.
267 */
268 new_dev->mtu = real_dev->mtu;
269
270 vlan = vlan_dev_priv(new_dev);
271 vlan->vlan_proto = htons(ETH_P_8021Q);
272 vlan->vlan_id = vlan_id;
273 vlan->real_dev = real_dev;
274 vlan->dent = NULL;
275 vlan->flags = VLAN_FLAG_REORDER_HDR;
276
277 new_dev->rtnl_link_ops = &vlan_link_ops;
278 err = register_vlan_dev(new_dev, NULL);
279 if (err < 0)
280 goto out_free_newdev;
281
282 return 0;
283
284 out_free_newdev:
285 free_netdev(new_dev);
286 return err;
287 }
288
vlan_sync_address(struct net_device * dev,struct net_device * vlandev)289 static void vlan_sync_address(struct net_device *dev,
290 struct net_device *vlandev)
291 {
292 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
293
294 /* May be called without an actual change */
295 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
296 return;
297
298 /* vlan continues to inherit address of lower device */
299 if (vlan_dev_inherit_address(vlandev, dev))
300 goto out;
301
302 /* vlan address was different from the old address and is equal to
303 * the new address */
304 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
305 ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
306 dev_uc_del(dev, vlandev->dev_addr);
307
308 /* vlan address was equal to the old address and is different from
309 * the new address */
310 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
311 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
312 dev_uc_add(dev, vlandev->dev_addr);
313
314 out:
315 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
316 }
317
vlan_transfer_features(struct net_device * dev,struct net_device * vlandev)318 static void vlan_transfer_features(struct net_device *dev,
319 struct net_device *vlandev)
320 {
321 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
322
323 netif_inherit_tso_max(vlandev, dev);
324
325 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
326 vlandev->hard_header_len = dev->hard_header_len;
327 else
328 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
329
330 #if IS_ENABLED(CONFIG_FCOE)
331 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
332 #endif
333
334 vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
335 vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
336 vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
337
338 netdev_update_features(vlandev);
339 }
340
__vlan_device_event(struct net_device * dev,unsigned long event)341 static int __vlan_device_event(struct net_device *dev, unsigned long event)
342 {
343 int err = 0;
344
345 switch (event) {
346 case NETDEV_CHANGENAME:
347 vlan_proc_rem_dev(dev);
348 err = vlan_proc_add_dev(dev);
349 break;
350 case NETDEV_REGISTER:
351 err = vlan_proc_add_dev(dev);
352 break;
353 case NETDEV_UNREGISTER:
354 vlan_proc_rem_dev(dev);
355 break;
356 }
357
358 return err;
359 }
360
vlan_vid0_add(struct net_device * dev)361 static void vlan_vid0_add(struct net_device *dev)
362 {
363 struct vlan_info *vlan_info;
364 int err;
365
366 if (!(dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
367 return;
368
369 pr_info("adding VLAN 0 to HW filter on device %s\n", dev->name);
370
371 err = vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
372 if (err)
373 return;
374
375 vlan_info = rtnl_dereference(dev->vlan_info);
376 vlan_info->auto_vid0 = true;
377 }
378
vlan_vid0_del(struct net_device * dev)379 static void vlan_vid0_del(struct net_device *dev)
380 {
381 struct vlan_info *vlan_info = rtnl_dereference(dev->vlan_info);
382
383 if (!vlan_info || !vlan_info->auto_vid0)
384 return;
385
386 vlan_info->auto_vid0 = false;
387 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
388 }
389
vlan_device_event(struct notifier_block * unused,unsigned long event,void * ptr)390 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
391 void *ptr)
392 {
393 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
394 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
395 struct vlan_group *grp;
396 struct vlan_info *vlan_info;
397 int i, flgs;
398 struct net_device *vlandev;
399 struct vlan_dev_priv *vlan;
400 bool last = false;
401 LIST_HEAD(list);
402 int err;
403
404 if (is_vlan_dev(dev)) {
405 int err = __vlan_device_event(dev, event);
406
407 if (err)
408 return notifier_from_errno(err);
409 }
410
411 if (event == NETDEV_UP)
412 vlan_vid0_add(dev);
413 else if (event == NETDEV_DOWN)
414 vlan_vid0_del(dev);
415
416 vlan_info = rtnl_dereference(dev->vlan_info);
417 if (!vlan_info)
418 goto out;
419 grp = &vlan_info->grp;
420
421 /* It is OK that we do not hold the group lock right now,
422 * as we run under the RTNL lock.
423 */
424
425 switch (event) {
426 case NETDEV_CHANGE:
427 /* Propagate real device state to vlan devices */
428 vlan_group_for_each_dev(grp, i, vlandev)
429 vlan_stacked_transfer_operstate(dev, vlandev,
430 vlan_dev_priv(vlandev));
431 break;
432
433 case NETDEV_CHANGEADDR:
434 /* Adjust unicast filters on underlying device */
435 vlan_group_for_each_dev(grp, i, vlandev) {
436 flgs = vlandev->flags;
437 if (!(flgs & IFF_UP))
438 continue;
439
440 vlan_sync_address(dev, vlandev);
441 }
442 break;
443
444 case NETDEV_CHANGEMTU:
445 vlan_group_for_each_dev(grp, i, vlandev) {
446 if (vlandev->mtu <= dev->mtu)
447 continue;
448
449 dev_set_mtu(vlandev, dev->mtu);
450 }
451 break;
452
453 case NETDEV_FEAT_CHANGE:
454 /* Propagate device features to underlying device */
455 vlan_group_for_each_dev(grp, i, vlandev)
456 vlan_transfer_features(dev, vlandev);
457 break;
458
459 case NETDEV_DOWN: {
460 struct net_device *tmp;
461 LIST_HEAD(close_list);
462
463 /* Put all VLANs for this dev in the down state too. */
464 vlan_group_for_each_dev(grp, i, vlandev) {
465 flgs = vlandev->flags;
466 if (!(flgs & IFF_UP))
467 continue;
468
469 vlan = vlan_dev_priv(vlandev);
470 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
471 list_add(&vlandev->close_list, &close_list);
472 }
473
474 dev_close_many(&close_list, false);
475
476 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
477 vlan_stacked_transfer_operstate(dev, vlandev,
478 vlan_dev_priv(vlandev));
479 list_del_init(&vlandev->close_list);
480 }
481 list_del(&close_list);
482 break;
483 }
484 case NETDEV_UP:
485 /* Put all VLANs for this dev in the up state too. */
486 vlan_group_for_each_dev(grp, i, vlandev) {
487 flgs = dev_get_flags(vlandev);
488 if (flgs & IFF_UP)
489 continue;
490
491 vlan = vlan_dev_priv(vlandev);
492 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
493 dev_change_flags(vlandev, flgs | IFF_UP,
494 extack);
495 vlan_stacked_transfer_operstate(dev, vlandev, vlan);
496 }
497 break;
498
499 case NETDEV_UNREGISTER:
500 /* twiddle thumbs on netns device moves */
501 if (dev->reg_state != NETREG_UNREGISTERING)
502 break;
503
504 vlan_group_for_each_dev(grp, i, vlandev) {
505 /* removal of last vid destroys vlan_info, abort
506 * afterwards */
507 if (vlan_info->nr_vids == 1)
508 last = true;
509
510 unregister_vlan_dev(vlandev, &list);
511 if (last)
512 break;
513 }
514 unregister_netdevice_many(&list);
515 break;
516
517 case NETDEV_PRE_TYPE_CHANGE:
518 /* Forbid underlaying device to change its type. */
519 if (vlan_uses_dev(dev))
520 return NOTIFY_BAD;
521 break;
522
523 case NETDEV_NOTIFY_PEERS:
524 case NETDEV_BONDING_FAILOVER:
525 case NETDEV_RESEND_IGMP:
526 /* Propagate to vlan devices */
527 vlan_group_for_each_dev(grp, i, vlandev)
528 call_netdevice_notifiers(event, vlandev);
529 break;
530
531 case NETDEV_CVLAN_FILTER_PUSH_INFO:
532 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
533 if (err)
534 return notifier_from_errno(err);
535 break;
536
537 case NETDEV_CVLAN_FILTER_DROP_INFO:
538 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
539 break;
540
541 case NETDEV_SVLAN_FILTER_PUSH_INFO:
542 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
543 if (err)
544 return notifier_from_errno(err);
545 break;
546
547 case NETDEV_SVLAN_FILTER_DROP_INFO:
548 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
549 break;
550 }
551
552 out:
553 return NOTIFY_DONE;
554 }
555
556 static struct notifier_block vlan_notifier_block __read_mostly = {
557 .notifier_call = vlan_device_event,
558 };
559
560 /*
561 * VLAN IOCTL handler.
562 * o execute requested action or pass command to the device driver
563 * arg is really a struct vlan_ioctl_args __user *.
564 */
vlan_ioctl_handler(struct net * net,void __user * arg)565 static int vlan_ioctl_handler(struct net *net, void __user *arg)
566 {
567 int err;
568 struct vlan_ioctl_args args;
569 struct net_device *dev = NULL;
570
571 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
572 return -EFAULT;
573
574 /* Null terminate this sucker, just in case. */
575 args.device1[sizeof(args.device1) - 1] = 0;
576 args.u.device2[sizeof(args.u.device2) - 1] = 0;
577
578 rtnl_lock();
579
580 switch (args.cmd) {
581 case SET_VLAN_INGRESS_PRIORITY_CMD:
582 case SET_VLAN_EGRESS_PRIORITY_CMD:
583 case SET_VLAN_FLAG_CMD:
584 case ADD_VLAN_CMD:
585 case DEL_VLAN_CMD:
586 case GET_VLAN_REALDEV_NAME_CMD:
587 case GET_VLAN_VID_CMD:
588 err = -ENODEV;
589 dev = __dev_get_by_name(net, args.device1);
590 if (!dev)
591 goto out;
592
593 err = -EINVAL;
594 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
595 goto out;
596 }
597
598 switch (args.cmd) {
599 case SET_VLAN_INGRESS_PRIORITY_CMD:
600 err = -EPERM;
601 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
602 break;
603 vlan_dev_set_ingress_priority(dev,
604 args.u.skb_priority,
605 args.vlan_qos);
606 err = 0;
607 break;
608
609 case SET_VLAN_EGRESS_PRIORITY_CMD:
610 err = -EPERM;
611 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
612 break;
613 err = vlan_dev_set_egress_priority(dev,
614 args.u.skb_priority,
615 args.vlan_qos);
616 break;
617
618 case SET_VLAN_FLAG_CMD:
619 err = -EPERM;
620 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
621 break;
622 err = vlan_dev_change_flags(dev,
623 args.vlan_qos ? args.u.flag : 0,
624 args.u.flag);
625 break;
626
627 case SET_VLAN_NAME_TYPE_CMD:
628 err = -EPERM;
629 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
630 break;
631 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
632 struct vlan_net *vn;
633
634 vn = net_generic(net, vlan_net_id);
635 vn->name_type = args.u.name_type;
636 err = 0;
637 } else {
638 err = -EINVAL;
639 }
640 break;
641
642 case ADD_VLAN_CMD:
643 err = -EPERM;
644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
645 break;
646 err = register_vlan_device(dev, args.u.VID);
647 break;
648
649 case DEL_VLAN_CMD:
650 err = -EPERM;
651 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
652 break;
653 unregister_vlan_dev(dev, NULL);
654 err = 0;
655 break;
656
657 case GET_VLAN_REALDEV_NAME_CMD:
658 err = 0;
659 vlan_dev_get_realdev_name(dev, args.u.device2,
660 sizeof(args.u.device2));
661 if (copy_to_user(arg, &args,
662 sizeof(struct vlan_ioctl_args)))
663 err = -EFAULT;
664 break;
665
666 case GET_VLAN_VID_CMD:
667 err = 0;
668 args.u.VID = vlan_dev_vlan_id(dev);
669 if (copy_to_user(arg, &args,
670 sizeof(struct vlan_ioctl_args)))
671 err = -EFAULT;
672 break;
673
674 default:
675 err = -EOPNOTSUPP;
676 break;
677 }
678 out:
679 rtnl_unlock();
680 return err;
681 }
682
vlan_init_net(struct net * net)683 static int __net_init vlan_init_net(struct net *net)
684 {
685 struct vlan_net *vn = net_generic(net, vlan_net_id);
686 int err;
687
688 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
689
690 err = vlan_proc_init(net);
691
692 return err;
693 }
694
vlan_exit_net(struct net * net)695 static void __net_exit vlan_exit_net(struct net *net)
696 {
697 vlan_proc_cleanup(net);
698 }
699
700 static struct pernet_operations vlan_net_ops = {
701 .init = vlan_init_net,
702 .exit = vlan_exit_net,
703 .id = &vlan_net_id,
704 .size = sizeof(struct vlan_net),
705 };
706
vlan_proto_init(void)707 static int __init vlan_proto_init(void)
708 {
709 int err;
710
711 pr_info("%s v%s\n", vlan_fullname, vlan_version);
712
713 err = register_pernet_subsys(&vlan_net_ops);
714 if (err < 0)
715 goto err0;
716
717 err = register_netdevice_notifier(&vlan_notifier_block);
718 if (err < 0)
719 goto err2;
720
721 err = vlan_gvrp_init();
722 if (err < 0)
723 goto err3;
724
725 err = vlan_mvrp_init();
726 if (err < 0)
727 goto err4;
728
729 err = vlan_netlink_init();
730 if (err < 0)
731 goto err5;
732
733 vlan_ioctl_set(vlan_ioctl_handler);
734 return 0;
735
736 err5:
737 vlan_mvrp_uninit();
738 err4:
739 vlan_gvrp_uninit();
740 err3:
741 unregister_netdevice_notifier(&vlan_notifier_block);
742 err2:
743 unregister_pernet_subsys(&vlan_net_ops);
744 err0:
745 return err;
746 }
747
vlan_cleanup_module(void)748 static void __exit vlan_cleanup_module(void)
749 {
750 vlan_ioctl_set(NULL);
751
752 vlan_netlink_fini();
753
754 unregister_netdevice_notifier(&vlan_notifier_block);
755
756 unregister_pernet_subsys(&vlan_net_ops);
757 rcu_barrier(); /* Wait for completion of call_rcu()'s */
758
759 vlan_mvrp_uninit();
760 vlan_gvrp_uninit();
761 }
762
763 module_init(vlan_proto_init);
764 module_exit(vlan_cleanup_module);
765
766 MODULE_LICENSE("GPL");
767 MODULE_VERSION(DRV_VERSION);
768