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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 pidx, vidx;
55 	unsigned int size;
56 
57 	ASSERT_RTNL();
58 
59 	pidx  = vlan_proto_idx(vlan_proto);
60 	vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
61 	array = vg->vlan_devices_arrays[pidx][vidx];
62 	if (array != NULL)
63 		return 0;
64 
65 	size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
66 	array = kzalloc(size, GFP_KERNEL);
67 	if (array == NULL)
68 		return -ENOBUFS;
69 
70 	vg->vlan_devices_arrays[pidx][vidx] = array;
71 	return 0;
72 }
73 
vlan_stacked_transfer_operstate(const struct net_device * rootdev,struct net_device * dev,struct vlan_dev_priv * vlan)74 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
75 					    struct net_device *dev,
76 					    struct vlan_dev_priv *vlan)
77 {
78 	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
79 		netif_stacked_transfer_operstate(rootdev, dev);
80 }
81 
unregister_vlan_dev(struct net_device * dev,struct list_head * head)82 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
83 {
84 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
85 	struct net_device *real_dev = vlan->real_dev;
86 	struct vlan_info *vlan_info;
87 	struct vlan_group *grp;
88 	u16 vlan_id = vlan->vlan_id;
89 
90 	ASSERT_RTNL();
91 
92 	vlan_info = rtnl_dereference(real_dev->vlan_info);
93 	BUG_ON(!vlan_info);
94 
95 	grp = &vlan_info->grp;
96 
97 	grp->nr_vlan_devs--;
98 
99 	if (vlan->flags & VLAN_FLAG_MVRP)
100 		vlan_mvrp_request_leave(dev);
101 	if (vlan->flags & VLAN_FLAG_GVRP)
102 		vlan_gvrp_request_leave(dev);
103 
104 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
105 
106 	netdev_upper_dev_unlink(real_dev, dev);
107 	/* Because unregister_netdevice_queue() makes sure at least one rcu
108 	 * grace period is respected before device freeing,
109 	 * we dont need to call synchronize_net() here.
110 	 */
111 	unregister_netdevice_queue(dev, head);
112 
113 	if (grp->nr_vlan_devs == 0) {
114 		vlan_mvrp_uninit_applicant(real_dev);
115 		vlan_gvrp_uninit_applicant(real_dev);
116 	}
117 
118 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
119 }
120 
vlan_check_real_dev(struct net_device * real_dev,__be16 protocol,u16 vlan_id,struct netlink_ext_ack * extack)121 int vlan_check_real_dev(struct net_device *real_dev,
122 			__be16 protocol, u16 vlan_id,
123 			struct netlink_ext_ack *extack)
124 {
125 	const char *name = real_dev->name;
126 
127 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
128 		pr_info("VLANs not supported on %s\n", name);
129 		NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
130 		return -EOPNOTSUPP;
131 	}
132 
133 	if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
134 		NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
135 		return -EEXIST;
136 	}
137 
138 	return 0;
139 }
140 
register_vlan_dev(struct net_device * dev,struct netlink_ext_ack * extack)141 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
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 	err = register_netdevice(dev);
173 	if (err < 0)
174 		goto out_uninit_mvrp;
175 
176 	err = netdev_upper_dev_link(real_dev, dev, extack);
177 	if (err)
178 		goto out_unregister_netdev;
179 
180 	vlan_stacked_transfer_operstate(real_dev, dev, vlan);
181 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
182 
183 	/* So, got the sucker initialized, now lets place
184 	 * it into our local structure.
185 	 */
186 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
187 	grp->nr_vlan_devs++;
188 
189 	return 0;
190 
191 out_unregister_netdev:
192 	unregister_netdevice(dev);
193 out_uninit_mvrp:
194 	if (grp->nr_vlan_devs == 0)
195 		vlan_mvrp_uninit_applicant(real_dev);
196 out_uninit_gvrp:
197 	if (grp->nr_vlan_devs == 0)
198 		vlan_gvrp_uninit_applicant(real_dev);
199 out_vid_del:
200 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
201 	return err;
202 }
203 
204 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
205  *  Returns 0 if the device was created or a negative error code otherwise.
206  */
register_vlan_device(struct net_device * real_dev,u16 vlan_id)207 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
208 {
209 	struct net_device *new_dev;
210 	struct vlan_dev_priv *vlan;
211 	struct net *net = dev_net(real_dev);
212 	struct vlan_net *vn = net_generic(net, vlan_net_id);
213 	char name[IFNAMSIZ];
214 	int err;
215 
216 	if (vlan_id >= VLAN_VID_MASK)
217 		return -ERANGE;
218 
219 	err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
220 				  NULL);
221 	if (err < 0)
222 		return err;
223 
224 	/* Gotta set up the fields for the device. */
225 	switch (vn->name_type) {
226 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
227 		/* name will look like:	 eth1.0005 */
228 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
229 		break;
230 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
231 		/* Put our vlan.VID in the name.
232 		 * Name will look like:	 vlan5
233 		 */
234 		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
235 		break;
236 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
237 		/* Put our vlan.VID in the name.
238 		 * Name will look like:	 eth0.5
239 		 */
240 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
241 		break;
242 	case VLAN_NAME_TYPE_PLUS_VID:
243 		/* Put our vlan.VID in the name.
244 		 * Name will look like:	 vlan0005
245 		 */
246 	default:
247 		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
248 	}
249 
250 	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
251 			       NET_NAME_UNKNOWN, vlan_setup);
252 
253 	if (new_dev == NULL)
254 		return -ENOBUFS;
255 
256 	dev_net_set(new_dev, net);
257 	/* need 4 bytes for extra VLAN header info,
258 	 * hope the underlying device can handle it.
259 	 */
260 	new_dev->mtu = real_dev->mtu;
261 
262 	vlan = vlan_dev_priv(new_dev);
263 	vlan->vlan_proto = htons(ETH_P_8021Q);
264 	vlan->vlan_id = vlan_id;
265 	vlan->real_dev = real_dev;
266 	vlan->dent = NULL;
267 	vlan->flags = VLAN_FLAG_REORDER_HDR;
268 
269 	new_dev->rtnl_link_ops = &vlan_link_ops;
270 	err = register_vlan_dev(new_dev, NULL);
271 	if (err < 0)
272 		goto out_free_newdev;
273 
274 	return 0;
275 
276 out_free_newdev:
277 	if (new_dev->reg_state == NETREG_UNINITIALIZED ||
278 	    new_dev->reg_state == NETREG_UNREGISTERED)
279 		free_netdev(new_dev);
280 	return err;
281 }
282 
vlan_sync_address(struct net_device * dev,struct net_device * vlandev)283 static void vlan_sync_address(struct net_device *dev,
284 			      struct net_device *vlandev)
285 {
286 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
287 
288 	/* May be called without an actual change */
289 	if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
290 		return;
291 
292 	/* vlan continues to inherit address of lower device */
293 	if (vlan_dev_inherit_address(vlandev, dev))
294 		goto out;
295 
296 	/* vlan address was different from the old address and is equal to
297 	 * the new address */
298 	if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
299 	    ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
300 		dev_uc_del(dev, vlandev->dev_addr);
301 
302 	/* vlan address was equal to the old address and is different from
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_add(dev, vlandev->dev_addr);
307 
308 out:
309 	ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
310 }
311 
vlan_transfer_features(struct net_device * dev,struct net_device * vlandev)312 static void vlan_transfer_features(struct net_device *dev,
313 				   struct net_device *vlandev)
314 {
315 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
316 
317 	vlandev->gso_max_size = dev->gso_max_size;
318 	vlandev->gso_max_segs = dev->gso_max_segs;
319 
320 	if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
321 		vlandev->hard_header_len = dev->hard_header_len;
322 	else
323 		vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
324 
325 #if IS_ENABLED(CONFIG_FCOE)
326 	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
327 #endif
328 
329 	vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
330 	vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
331 	vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
332 
333 	netdev_update_features(vlandev);
334 }
335 
__vlan_device_event(struct net_device * dev,unsigned long event)336 static int __vlan_device_event(struct net_device *dev, unsigned long event)
337 {
338 	int err = 0;
339 
340 	switch (event) {
341 	case NETDEV_CHANGENAME:
342 		vlan_proc_rem_dev(dev);
343 		err = vlan_proc_add_dev(dev);
344 		break;
345 	case NETDEV_REGISTER:
346 		err = vlan_proc_add_dev(dev);
347 		break;
348 	case NETDEV_UNREGISTER:
349 		vlan_proc_rem_dev(dev);
350 		break;
351 	}
352 
353 	return err;
354 }
355 
vlan_device_event(struct notifier_block * unused,unsigned long event,void * ptr)356 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
357 			     void *ptr)
358 {
359 	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
360 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
361 	struct vlan_group *grp;
362 	struct vlan_info *vlan_info;
363 	int i, flgs;
364 	struct net_device *vlandev;
365 	struct vlan_dev_priv *vlan;
366 	bool last = false;
367 	LIST_HEAD(list);
368 	int err;
369 
370 	if (is_vlan_dev(dev)) {
371 		int err = __vlan_device_event(dev, event);
372 
373 		if (err)
374 			return notifier_from_errno(err);
375 	}
376 
377 	if ((event == NETDEV_UP) &&
378 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
379 		pr_info("adding VLAN 0 to HW filter on device %s\n",
380 			dev->name);
381 		vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
382 	}
383 	if (event == NETDEV_DOWN &&
384 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
385 		vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
386 
387 	vlan_info = rtnl_dereference(dev->vlan_info);
388 	if (!vlan_info)
389 		goto out;
390 	grp = &vlan_info->grp;
391 
392 	/* It is OK that we do not hold the group lock right now,
393 	 * as we run under the RTNL lock.
394 	 */
395 
396 	switch (event) {
397 	case NETDEV_CHANGE:
398 		/* Propagate real device state to vlan devices */
399 		vlan_group_for_each_dev(grp, i, vlandev)
400 			vlan_stacked_transfer_operstate(dev, vlandev,
401 							vlan_dev_priv(vlandev));
402 		break;
403 
404 	case NETDEV_CHANGEADDR:
405 		/* Adjust unicast filters on underlying device */
406 		vlan_group_for_each_dev(grp, i, vlandev) {
407 			flgs = vlandev->flags;
408 			if (!(flgs & IFF_UP))
409 				continue;
410 
411 			vlan_sync_address(dev, vlandev);
412 		}
413 		break;
414 
415 	case NETDEV_CHANGEMTU:
416 		vlan_group_for_each_dev(grp, i, vlandev) {
417 			if (vlandev->mtu <= dev->mtu)
418 				continue;
419 
420 			dev_set_mtu(vlandev, dev->mtu);
421 		}
422 		break;
423 
424 	case NETDEV_FEAT_CHANGE:
425 		/* Propagate device features to underlying device */
426 		vlan_group_for_each_dev(grp, i, vlandev)
427 			vlan_transfer_features(dev, vlandev);
428 		break;
429 
430 	case NETDEV_DOWN: {
431 		struct net_device *tmp;
432 		LIST_HEAD(close_list);
433 
434 		/* Put all VLANs for this dev in the down state too.  */
435 		vlan_group_for_each_dev(grp, i, vlandev) {
436 			flgs = vlandev->flags;
437 			if (!(flgs & IFF_UP))
438 				continue;
439 
440 			vlan = vlan_dev_priv(vlandev);
441 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
442 				list_add(&vlandev->close_list, &close_list);
443 		}
444 
445 		dev_close_many(&close_list, false);
446 
447 		list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
448 			vlan_stacked_transfer_operstate(dev, vlandev,
449 							vlan_dev_priv(vlandev));
450 			list_del_init(&vlandev->close_list);
451 		}
452 		list_del(&close_list);
453 		break;
454 	}
455 	case NETDEV_UP:
456 		/* Put all VLANs for this dev in the up state too.  */
457 		vlan_group_for_each_dev(grp, i, vlandev) {
458 			flgs = dev_get_flags(vlandev);
459 			if (flgs & IFF_UP)
460 				continue;
461 
462 			vlan = vlan_dev_priv(vlandev);
463 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
464 				dev_change_flags(vlandev, flgs | IFF_UP,
465 						 extack);
466 			vlan_stacked_transfer_operstate(dev, vlandev, vlan);
467 		}
468 		break;
469 
470 	case NETDEV_UNREGISTER:
471 		/* twiddle thumbs on netns device moves */
472 		if (dev->reg_state != NETREG_UNREGISTERING)
473 			break;
474 
475 		vlan_group_for_each_dev(grp, i, vlandev) {
476 			/* removal of last vid destroys vlan_info, abort
477 			 * afterwards */
478 			if (vlan_info->nr_vids == 1)
479 				last = true;
480 
481 			unregister_vlan_dev(vlandev, &list);
482 			if (last)
483 				break;
484 		}
485 		unregister_netdevice_many(&list);
486 		break;
487 
488 	case NETDEV_PRE_TYPE_CHANGE:
489 		/* Forbid underlaying device to change its type. */
490 		if (vlan_uses_dev(dev))
491 			return NOTIFY_BAD;
492 		break;
493 
494 	case NETDEV_NOTIFY_PEERS:
495 	case NETDEV_BONDING_FAILOVER:
496 	case NETDEV_RESEND_IGMP:
497 		/* Propagate to vlan devices */
498 		vlan_group_for_each_dev(grp, i, vlandev)
499 			call_netdevice_notifiers(event, vlandev);
500 		break;
501 
502 	case NETDEV_CVLAN_FILTER_PUSH_INFO:
503 		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
504 		if (err)
505 			return notifier_from_errno(err);
506 		break;
507 
508 	case NETDEV_CVLAN_FILTER_DROP_INFO:
509 		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
510 		break;
511 
512 	case NETDEV_SVLAN_FILTER_PUSH_INFO:
513 		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
514 		if (err)
515 			return notifier_from_errno(err);
516 		break;
517 
518 	case NETDEV_SVLAN_FILTER_DROP_INFO:
519 		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
520 		break;
521 	}
522 
523 out:
524 	return NOTIFY_DONE;
525 }
526 
527 static struct notifier_block vlan_notifier_block __read_mostly = {
528 	.notifier_call = vlan_device_event,
529 };
530 
531 /*
532  *	VLAN IOCTL handler.
533  *	o execute requested action or pass command to the device driver
534  *   arg is really a struct vlan_ioctl_args __user *.
535  */
vlan_ioctl_handler(struct net * net,void __user * arg)536 static int vlan_ioctl_handler(struct net *net, void __user *arg)
537 {
538 	int err;
539 	struct vlan_ioctl_args args;
540 	struct net_device *dev = NULL;
541 
542 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
543 		return -EFAULT;
544 
545 	/* Null terminate this sucker, just in case. */
546 	args.device1[sizeof(args.device1) - 1] = 0;
547 	args.u.device2[sizeof(args.u.device2) - 1] = 0;
548 
549 	rtnl_lock();
550 
551 	switch (args.cmd) {
552 	case SET_VLAN_INGRESS_PRIORITY_CMD:
553 	case SET_VLAN_EGRESS_PRIORITY_CMD:
554 	case SET_VLAN_FLAG_CMD:
555 	case ADD_VLAN_CMD:
556 	case DEL_VLAN_CMD:
557 	case GET_VLAN_REALDEV_NAME_CMD:
558 	case GET_VLAN_VID_CMD:
559 		err = -ENODEV;
560 		dev = __dev_get_by_name(net, args.device1);
561 		if (!dev)
562 			goto out;
563 
564 		err = -EINVAL;
565 		if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
566 			goto out;
567 	}
568 
569 	switch (args.cmd) {
570 	case SET_VLAN_INGRESS_PRIORITY_CMD:
571 		err = -EPERM;
572 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
573 			break;
574 		vlan_dev_set_ingress_priority(dev,
575 					      args.u.skb_priority,
576 					      args.vlan_qos);
577 		err = 0;
578 		break;
579 
580 	case SET_VLAN_EGRESS_PRIORITY_CMD:
581 		err = -EPERM;
582 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
583 			break;
584 		err = vlan_dev_set_egress_priority(dev,
585 						   args.u.skb_priority,
586 						   args.vlan_qos);
587 		break;
588 
589 	case SET_VLAN_FLAG_CMD:
590 		err = -EPERM;
591 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
592 			break;
593 		err = vlan_dev_change_flags(dev,
594 					    args.vlan_qos ? args.u.flag : 0,
595 					    args.u.flag);
596 		break;
597 
598 	case SET_VLAN_NAME_TYPE_CMD:
599 		err = -EPERM;
600 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
601 			break;
602 		if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
603 			struct vlan_net *vn;
604 
605 			vn = net_generic(net, vlan_net_id);
606 			vn->name_type = args.u.name_type;
607 			err = 0;
608 		} else {
609 			err = -EINVAL;
610 		}
611 		break;
612 
613 	case ADD_VLAN_CMD:
614 		err = -EPERM;
615 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
616 			break;
617 		err = register_vlan_device(dev, args.u.VID);
618 		break;
619 
620 	case DEL_VLAN_CMD:
621 		err = -EPERM;
622 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
623 			break;
624 		unregister_vlan_dev(dev, NULL);
625 		err = 0;
626 		break;
627 
628 	case GET_VLAN_REALDEV_NAME_CMD:
629 		err = 0;
630 		vlan_dev_get_realdev_name(dev, args.u.device2);
631 		if (copy_to_user(arg, &args,
632 				 sizeof(struct vlan_ioctl_args)))
633 			err = -EFAULT;
634 		break;
635 
636 	case GET_VLAN_VID_CMD:
637 		err = 0;
638 		args.u.VID = vlan_dev_vlan_id(dev);
639 		if (copy_to_user(arg, &args,
640 				 sizeof(struct vlan_ioctl_args)))
641 		      err = -EFAULT;
642 		break;
643 
644 	default:
645 		err = -EOPNOTSUPP;
646 		break;
647 	}
648 out:
649 	rtnl_unlock();
650 	return err;
651 }
652 
vlan_init_net(struct net * net)653 static int __net_init vlan_init_net(struct net *net)
654 {
655 	struct vlan_net *vn = net_generic(net, vlan_net_id);
656 	int err;
657 
658 	vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
659 
660 	err = vlan_proc_init(net);
661 
662 	return err;
663 }
664 
vlan_exit_net(struct net * net)665 static void __net_exit vlan_exit_net(struct net *net)
666 {
667 	vlan_proc_cleanup(net);
668 }
669 
670 static struct pernet_operations vlan_net_ops = {
671 	.init = vlan_init_net,
672 	.exit = vlan_exit_net,
673 	.id   = &vlan_net_id,
674 	.size = sizeof(struct vlan_net),
675 };
676 
vlan_proto_init(void)677 static int __init vlan_proto_init(void)
678 {
679 	int err;
680 
681 	pr_info("%s v%s\n", vlan_fullname, vlan_version);
682 
683 	err = register_pernet_subsys(&vlan_net_ops);
684 	if (err < 0)
685 		goto err0;
686 
687 	err = register_netdevice_notifier(&vlan_notifier_block);
688 	if (err < 0)
689 		goto err2;
690 
691 	err = vlan_gvrp_init();
692 	if (err < 0)
693 		goto err3;
694 
695 	err = vlan_mvrp_init();
696 	if (err < 0)
697 		goto err4;
698 
699 	err = vlan_netlink_init();
700 	if (err < 0)
701 		goto err5;
702 
703 	vlan_ioctl_set(vlan_ioctl_handler);
704 	return 0;
705 
706 err5:
707 	vlan_mvrp_uninit();
708 err4:
709 	vlan_gvrp_uninit();
710 err3:
711 	unregister_netdevice_notifier(&vlan_notifier_block);
712 err2:
713 	unregister_pernet_subsys(&vlan_net_ops);
714 err0:
715 	return err;
716 }
717 
vlan_cleanup_module(void)718 static void __exit vlan_cleanup_module(void)
719 {
720 	vlan_ioctl_set(NULL);
721 
722 	vlan_netlink_fini();
723 
724 	unregister_netdevice_notifier(&vlan_notifier_block);
725 
726 	unregister_pernet_subsys(&vlan_net_ops);
727 	rcu_barrier(); /* Wait for completion of call_rcu()'s */
728 
729 	vlan_mvrp_uninit();
730 	vlan_gvrp_uninit();
731 }
732 
733 module_init(vlan_proto_init);
734 module_exit(vlan_cleanup_module);
735 
736 MODULE_LICENSE("GPL");
737 MODULE_VERSION(DRV_VERSION);
738