xref: /openbmc/linux/net/8021q/vlan.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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 __read_mostly;
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, struct list_head *head)
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 	grp->nr_vlans--;
163 
164 	vlan_group_set_device(grp, vlan_id, NULL);
165 	if (!grp->killall)
166 		synchronize_net();
167 
168 	unregister_netdevice_queue(dev, head);
169 
170 	/* If the group is now empty, kill off the group. */
171 	if (grp->nr_vlans == 0) {
172 		vlan_gvrp_uninit_applicant(real_dev);
173 
174 		if (real_dev->features & NETIF_F_HW_VLAN_RX)
175 			ops->ndo_vlan_rx_register(real_dev, NULL);
176 
177 		hlist_del_rcu(&grp->hlist);
178 
179 		/* Free the group, after all cpu's are done. */
180 		call_rcu(&grp->rcu, vlan_rcu_free);
181 	}
182 
183 	/* Get rid of the vlan's reference to real_dev */
184 	dev_put(real_dev);
185 }
186 
187 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
188 {
189 	const char *name = real_dev->name;
190 	const struct net_device_ops *ops = real_dev->netdev_ops;
191 
192 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
193 		pr_info("8021q: VLANs not supported on %s\n", name);
194 		return -EOPNOTSUPP;
195 	}
196 
197 	if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
198 		pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
199 		return -EOPNOTSUPP;
200 	}
201 
202 	if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
203 	    (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
204 		pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
205 		return -EOPNOTSUPP;
206 	}
207 
208 	if (__find_vlan_dev(real_dev, vlan_id) != NULL)
209 		return -EEXIST;
210 
211 	return 0;
212 }
213 
214 int register_vlan_dev(struct net_device *dev)
215 {
216 	struct vlan_dev_info *vlan = vlan_dev_info(dev);
217 	struct net_device *real_dev = vlan->real_dev;
218 	const struct net_device_ops *ops = real_dev->netdev_ops;
219 	u16 vlan_id = vlan->vlan_id;
220 	struct vlan_group *grp, *ngrp = NULL;
221 	int err;
222 
223 	grp = __vlan_find_group(real_dev);
224 	if (!grp) {
225 		ngrp = grp = vlan_group_alloc(real_dev);
226 		if (!grp)
227 			return -ENOBUFS;
228 		err = vlan_gvrp_init_applicant(real_dev);
229 		if (err < 0)
230 			goto out_free_group;
231 	}
232 
233 	err = vlan_group_prealloc_vid(grp, vlan_id);
234 	if (err < 0)
235 		goto out_uninit_applicant;
236 
237 	err = register_netdevice(dev);
238 	if (err < 0)
239 		goto out_uninit_applicant;
240 
241 	/* Account for reference in struct vlan_dev_info */
242 	dev_hold(real_dev);
243 
244 	netif_stacked_transfer_operstate(real_dev, dev);
245 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
246 
247 	/* So, got the sucker initialized, now lets place
248 	 * it into our local structure.
249 	 */
250 	vlan_group_set_device(grp, vlan_id, dev);
251 	grp->nr_vlans++;
252 
253 	if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
254 		ops->ndo_vlan_rx_register(real_dev, ngrp);
255 	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
256 		ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
257 
258 	return 0;
259 
260 out_uninit_applicant:
261 	if (ngrp)
262 		vlan_gvrp_uninit_applicant(real_dev);
263 out_free_group:
264 	if (ngrp) {
265 		hlist_del_rcu(&ngrp->hlist);
266 		/* Free the group, after all cpu's are done. */
267 		call_rcu(&ngrp->rcu, vlan_rcu_free);
268 	}
269 	return err;
270 }
271 
272 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
273  *  Returns 0 if the device was created or a negative error code otherwise.
274  */
275 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
276 {
277 	struct net_device *new_dev;
278 	struct net *net = dev_net(real_dev);
279 	struct vlan_net *vn = net_generic(net, vlan_net_id);
280 	char name[IFNAMSIZ];
281 	int err;
282 
283 	if (vlan_id >= VLAN_VID_MASK)
284 		return -ERANGE;
285 
286 	err = vlan_check_real_dev(real_dev, vlan_id);
287 	if (err < 0)
288 		return err;
289 
290 	/* Gotta set up the fields for the device. */
291 	switch (vn->name_type) {
292 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
293 		/* name will look like:	 eth1.0005 */
294 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
295 		break;
296 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
297 		/* Put our vlan.VID in the name.
298 		 * Name will look like:	 vlan5
299 		 */
300 		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
301 		break;
302 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
303 		/* Put our vlan.VID in the name.
304 		 * Name will look like:	 eth0.5
305 		 */
306 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
307 		break;
308 	case VLAN_NAME_TYPE_PLUS_VID:
309 		/* Put our vlan.VID in the name.
310 		 * Name will look like:	 vlan0005
311 		 */
312 	default:
313 		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
314 	}
315 
316 	new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
317 				  vlan_setup, real_dev->num_tx_queues);
318 
319 	if (new_dev == NULL)
320 		return -ENOBUFS;
321 
322 	new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
323 	dev_net_set(new_dev, net);
324 	/* need 4 bytes for extra VLAN header info,
325 	 * hope the underlying device can handle it.
326 	 */
327 	new_dev->mtu = real_dev->mtu;
328 
329 	vlan_dev_info(new_dev)->vlan_id = vlan_id;
330 	vlan_dev_info(new_dev)->real_dev = real_dev;
331 	vlan_dev_info(new_dev)->dent = NULL;
332 	vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
333 
334 	new_dev->rtnl_link_ops = &vlan_link_ops;
335 	err = register_vlan_dev(new_dev);
336 	if (err < 0)
337 		goto out_free_newdev;
338 
339 	return 0;
340 
341 out_free_newdev:
342 	free_netdev(new_dev);
343 	return err;
344 }
345 
346 static void vlan_sync_address(struct net_device *dev,
347 			      struct net_device *vlandev)
348 {
349 	struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
350 
351 	/* May be called without an actual change */
352 	if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
353 		return;
354 
355 	/* vlan address was different from the old address and is equal to
356 	 * the new address */
357 	if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
358 	    !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
359 		dev_unicast_delete(dev, vlandev->dev_addr);
360 
361 	/* vlan address was equal to the old address and is different from
362 	 * the new address */
363 	if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
364 	    compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
365 		dev_unicast_add(dev, vlandev->dev_addr);
366 
367 	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
368 }
369 
370 static void vlan_transfer_features(struct net_device *dev,
371 				   struct net_device *vlandev)
372 {
373 	unsigned long old_features = vlandev->features;
374 
375 	vlandev->features &= ~dev->vlan_features;
376 	vlandev->features |= dev->features & dev->vlan_features;
377 	vlandev->gso_max_size = dev->gso_max_size;
378 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
379 	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
380 #endif
381 
382 	if (old_features != vlandev->features)
383 		netdev_features_change(vlandev);
384 }
385 
386 static void __vlan_device_event(struct net_device *dev, unsigned long event)
387 {
388 	switch (event) {
389 	case NETDEV_CHANGENAME:
390 		vlan_proc_rem_dev(dev);
391 		if (vlan_proc_add_dev(dev) < 0)
392 			pr_warning("8021q: failed to change proc name for %s\n",
393 					dev->name);
394 		break;
395 	case NETDEV_REGISTER:
396 		if (vlan_proc_add_dev(dev) < 0)
397 			pr_warning("8021q: failed to add proc entry for %s\n",
398 					dev->name);
399 		break;
400 	case NETDEV_UNREGISTER:
401 		vlan_proc_rem_dev(dev);
402 		break;
403 	}
404 }
405 
406 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
407 			     void *ptr)
408 {
409 	struct net_device *dev = ptr;
410 	struct vlan_group *grp;
411 	int i, flgs;
412 	struct net_device *vlandev;
413 	struct vlan_dev_info *vlan;
414 	LIST_HEAD(list);
415 
416 	if (is_vlan_dev(dev))
417 		__vlan_device_event(dev, event);
418 
419 	grp = __vlan_find_group(dev);
420 	if (!grp)
421 		goto out;
422 
423 	/* It is OK that we do not hold the group lock right now,
424 	 * as we run under the RTNL lock.
425 	 */
426 
427 	switch (event) {
428 	case NETDEV_CHANGE:
429 		/* Propagate real device state to vlan devices */
430 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
431 			vlandev = vlan_group_get_device(grp, i);
432 			if (!vlandev)
433 				continue;
434 
435 			netif_stacked_transfer_operstate(dev, vlandev);
436 		}
437 		break;
438 
439 	case NETDEV_CHANGEADDR:
440 		/* Adjust unicast filters on underlying device */
441 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
442 			vlandev = vlan_group_get_device(grp, i);
443 			if (!vlandev)
444 				continue;
445 
446 			flgs = vlandev->flags;
447 			if (!(flgs & IFF_UP))
448 				continue;
449 
450 			vlan_sync_address(dev, vlandev);
451 		}
452 		break;
453 
454 	case NETDEV_CHANGEMTU:
455 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
456 			vlandev = vlan_group_get_device(grp, i);
457 			if (!vlandev)
458 				continue;
459 
460 			if (vlandev->mtu <= dev->mtu)
461 				continue;
462 
463 			dev_set_mtu(vlandev, dev->mtu);
464 		}
465 		break;
466 
467 	case NETDEV_FEAT_CHANGE:
468 		/* Propagate device features to underlying device */
469 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
470 			vlandev = vlan_group_get_device(grp, i);
471 			if (!vlandev)
472 				continue;
473 
474 			vlan_transfer_features(dev, vlandev);
475 		}
476 
477 		break;
478 
479 	case NETDEV_DOWN:
480 		/* Put all VLANs for this dev in the down state too.  */
481 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
482 			vlandev = vlan_group_get_device(grp, i);
483 			if (!vlandev)
484 				continue;
485 
486 			flgs = vlandev->flags;
487 			if (!(flgs & IFF_UP))
488 				continue;
489 
490 			vlan = vlan_dev_info(vlandev);
491 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
492 				dev_change_flags(vlandev, flgs & ~IFF_UP);
493 			netif_stacked_transfer_operstate(dev, vlandev);
494 		}
495 		break;
496 
497 	case NETDEV_UP:
498 		/* Put all VLANs for this dev in the up state too.  */
499 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
500 			vlandev = vlan_group_get_device(grp, i);
501 			if (!vlandev)
502 				continue;
503 
504 			flgs = vlandev->flags;
505 			if (flgs & IFF_UP)
506 				continue;
507 
508 			vlan = vlan_dev_info(vlandev);
509 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
510 				dev_change_flags(vlandev, flgs | IFF_UP);
511 			netif_stacked_transfer_operstate(dev, vlandev);
512 		}
513 		break;
514 
515 	case NETDEV_UNREGISTER:
516 		/* Delete all VLANs for this dev. */
517 		grp->killall = 1;
518 
519 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
520 			vlandev = vlan_group_get_device(grp, i);
521 			if (!vlandev)
522 				continue;
523 
524 			/* unregistration of last vlan destroys group, abort
525 			 * afterwards */
526 			if (grp->nr_vlans == 1)
527 				i = VLAN_GROUP_ARRAY_LEN;
528 
529 			unregister_vlan_dev(vlandev, &list);
530 		}
531 		unregister_netdevice_many(&list);
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, NULL);
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 	struct vlan_net *vn = net_generic(net, vlan_net_id);
669 	int err;
670 
671 	vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
672 
673 	err = vlan_proc_init(net);
674 
675 	return err;
676 }
677 
678 static void vlan_exit_net(struct net *net)
679 {
680 	vlan_proc_cleanup(net);
681 }
682 
683 static struct pernet_operations vlan_net_ops = {
684 	.init = vlan_init_net,
685 	.exit = vlan_exit_net,
686 	.id   = &vlan_net_id,
687 	.size = sizeof(struct vlan_net),
688 };
689 
690 static int __init vlan_proto_init(void)
691 {
692 	int err;
693 
694 	pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
695 	pr_info("All bugs added by %s\n", vlan_buggyright);
696 
697 	err = register_pernet_subsys(&vlan_net_ops);
698 	if (err < 0)
699 		goto err0;
700 
701 	err = register_netdevice_notifier(&vlan_notifier_block);
702 	if (err < 0)
703 		goto err2;
704 
705 	err = vlan_gvrp_init();
706 	if (err < 0)
707 		goto err3;
708 
709 	err = vlan_netlink_init();
710 	if (err < 0)
711 		goto err4;
712 
713 	dev_add_pack(&vlan_packet_type);
714 	vlan_ioctl_set(vlan_ioctl_handler);
715 	return 0;
716 
717 err4:
718 	vlan_gvrp_uninit();
719 err3:
720 	unregister_netdevice_notifier(&vlan_notifier_block);
721 err2:
722 	unregister_pernet_subsys(&vlan_net_ops);
723 err0:
724 	return err;
725 }
726 
727 static void __exit vlan_cleanup_module(void)
728 {
729 	unsigned int i;
730 
731 	vlan_ioctl_set(NULL);
732 	vlan_netlink_fini();
733 
734 	unregister_netdevice_notifier(&vlan_notifier_block);
735 
736 	dev_remove_pack(&vlan_packet_type);
737 
738 	/* This table must be empty if there are no module references left. */
739 	for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
740 		BUG_ON(!hlist_empty(&vlan_group_hash[i]));
741 
742 	unregister_pernet_subsys(&vlan_net_ops);
743 	rcu_barrier(); /* Wait for completion of call_rcu()'s */
744 
745 	vlan_gvrp_uninit();
746 }
747 
748 module_init(vlan_proto_init);
749 module_exit(vlan_cleanup_module);
750 
751 MODULE_LICENSE("GPL");
752 MODULE_VERSION(DRV_VERSION);
753