xref: /openbmc/linux/net/8021q/vlan.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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: vlan@scry.wanfear.com
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 <asm/uaccess.h> /* for copy_from_user */
22 #include <linux/capability.h>
23 #include <linux/module.h>
24 #include <linux/netdevice.h>
25 #include <linux/skbuff.h>
26 #include <net/datalink.h>
27 #include <linux/mm.h>
28 #include <linux/in.h>
29 #include <linux/init.h>
30 #include <net/p8022.h>
31 #include <net/arp.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/notifier.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 /* Our listing of VLAN group(s) */
44 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
45 #define vlan_grp_hashfn(IDX)	((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
46 
47 static char vlan_fullname[] = "802.1Q VLAN Support";
48 static char vlan_version[] = DRV_VERSION;
49 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
50 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
51 
52 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
53 static int vlan_ioctl_handler(void __user *);
54 static int unregister_vlan_dev(struct net_device *, unsigned short );
55 
56 static struct notifier_block vlan_notifier_block = {
57 	.notifier_call = vlan_device_event,
58 };
59 
60 /* These may be changed at run-time through IOCTLs */
61 
62 /* Determines interface naming scheme. */
63 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
64 
65 static struct packet_type vlan_packet_type = {
66 	.type = __constant_htons(ETH_P_8021Q),
67 	.func = vlan_skb_recv, /* VLAN receive method */
68 };
69 
70 /* End of global variables definitions. */
71 
72 /*
73  * Function vlan_proto_init (pro)
74  *
75  *    Initialize VLAN protocol layer,
76  *
77  */
78 static int __init vlan_proto_init(void)
79 {
80 	int err;
81 
82 	printk(VLAN_INF "%s v%s %s\n",
83 	       vlan_fullname, vlan_version, vlan_copyright);
84 	printk(VLAN_INF "All bugs added by %s\n",
85 	       vlan_buggyright);
86 
87 	/* proc file system initialization */
88 	err = vlan_proc_init();
89 	if (err < 0) {
90 		printk(KERN_ERR
91 		       "%s %s: can't create entry in proc filesystem!\n",
92 		       __FUNCTION__, VLAN_NAME);
93 		return err;
94 	}
95 
96 	dev_add_pack(&vlan_packet_type);
97 
98 	/* Register us to receive netdevice events */
99 	err = register_netdevice_notifier(&vlan_notifier_block);
100 	if (err < 0) {
101 		dev_remove_pack(&vlan_packet_type);
102 		vlan_proc_cleanup();
103 		return err;
104 	}
105 
106 	vlan_ioctl_set(vlan_ioctl_handler);
107 
108 	return 0;
109 }
110 
111 /* Cleanup all vlan devices
112  * Note: devices that have been registered that but not
113  * brought up will exist but have no module ref count.
114  */
115 static void __exit vlan_cleanup_devices(void)
116 {
117 	struct net_device *dev, *nxt;
118 
119 	rtnl_lock();
120 	for_each_netdev_safe(dev, nxt) {
121 		if (dev->priv_flags & IFF_802_1Q_VLAN) {
122 			unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
123 					    VLAN_DEV_INFO(dev)->vlan_id);
124 
125 			unregister_netdevice(dev);
126 		}
127 	}
128 	rtnl_unlock();
129 }
130 
131 /*
132  *     Module 'remove' entry point.
133  *     o delete /proc/net/router directory and static entries.
134  */
135 static void __exit vlan_cleanup_module(void)
136 {
137 	int i;
138 
139 	vlan_ioctl_set(NULL);
140 
141 	/* Un-register us from receiving netdevice events */
142 	unregister_netdevice_notifier(&vlan_notifier_block);
143 
144 	dev_remove_pack(&vlan_packet_type);
145 	vlan_cleanup_devices();
146 
147 	/* This table must be empty if there are no module
148 	 * references left.
149 	 */
150 	for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
151 		BUG_ON(!hlist_empty(&vlan_group_hash[i]));
152 	}
153 	vlan_proc_cleanup();
154 
155 	synchronize_net();
156 }
157 
158 module_init(vlan_proto_init);
159 module_exit(vlan_cleanup_module);
160 
161 /* Must be invoked with RCU read lock (no preempt) */
162 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
163 {
164 	struct vlan_group *grp;
165 	struct hlist_node *n;
166 	int hash = vlan_grp_hashfn(real_dev_ifindex);
167 
168 	hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
169 		if (grp->real_dev_ifindex == real_dev_ifindex)
170 			return grp;
171 	}
172 
173 	return NULL;
174 }
175 
176 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
177  *
178  * Must be invoked with RCU read lock (no preempt)
179  */
180 struct net_device *__find_vlan_dev(struct net_device *real_dev,
181 				   unsigned short VID)
182 {
183 	struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
184 
185 	if (grp)
186 		return vlan_group_get_device(grp, VID);
187 
188 	return NULL;
189 }
190 
191 static void vlan_group_free(struct vlan_group *grp)
192 {
193 	int i;
194 
195 	for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
196 		kfree(grp->vlan_devices_arrays[i]);
197 	kfree(grp);
198 }
199 
200 static void vlan_rcu_free(struct rcu_head *rcu)
201 {
202 	vlan_group_free(container_of(rcu, struct vlan_group, rcu));
203 }
204 
205 
206 /* This returns 0 if everything went fine.
207  * It will return 1 if the group was killed as a result.
208  * A negative return indicates failure.
209  *
210  * The RTNL lock must be held.
211  */
212 static int unregister_vlan_dev(struct net_device *real_dev,
213 			       unsigned short vlan_id)
214 {
215 	struct net_device *dev = NULL;
216 	int real_dev_ifindex = real_dev->ifindex;
217 	struct vlan_group *grp;
218 	int i, ret;
219 
220 #ifdef VLAN_DEBUG
221 	printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
222 #endif
223 
224 	/* sanity check */
225 	if (vlan_id >= VLAN_VID_MASK)
226 		return -EINVAL;
227 
228 	ASSERT_RTNL();
229 	grp = __vlan_find_group(real_dev_ifindex);
230 
231 	ret = 0;
232 
233 	if (grp) {
234 		dev = vlan_group_get_device(grp, vlan_id);
235 		if (dev) {
236 			/* Remove proc entry */
237 			vlan_proc_rem_dev(dev);
238 
239 			/* Take it out of our own structures, but be sure to
240 			 * interlock with HW accelerating devices or SW vlan
241 			 * input packet processing.
242 			 */
243 			if (real_dev->features &
244 			    (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
245 				real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
246 			}
247 
248 			vlan_group_set_device(grp, vlan_id, NULL);
249 			synchronize_net();
250 
251 
252 			/* Caller unregisters (and if necessary, puts)
253 			 * VLAN device, but we get rid of the reference to
254 			 * real_dev here.
255 			 */
256 			dev_put(real_dev);
257 
258 			/* If the group is now empty, kill off the
259 			 * group.
260 			 */
261 			for (i = 0; i < VLAN_VID_MASK; i++)
262 				if (vlan_group_get_device(grp, i))
263 					break;
264 
265 			if (i == VLAN_VID_MASK) {
266 				if (real_dev->features & NETIF_F_HW_VLAN_RX)
267 					real_dev->vlan_rx_register(real_dev, NULL);
268 
269 				hlist_del_rcu(&grp->hlist);
270 
271 				/* Free the group, after all cpu's are done. */
272 				call_rcu(&grp->rcu, vlan_rcu_free);
273 
274 				grp = NULL;
275 				ret = 1;
276 			}
277 		}
278 	}
279 
280 	return ret;
281 }
282 
283 static int unregister_vlan_device(const char *vlan_IF_name)
284 {
285 	struct net_device *dev = NULL;
286 	int ret;
287 
288 
289 	dev = dev_get_by_name(vlan_IF_name);
290 	ret = -EINVAL;
291 	if (dev) {
292 		if (dev->priv_flags & IFF_802_1Q_VLAN) {
293 			rtnl_lock();
294 
295 			ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
296 						  VLAN_DEV_INFO(dev)->vlan_id);
297 
298 			dev_put(dev);
299 			unregister_netdevice(dev);
300 
301 			rtnl_unlock();
302 
303 			if (ret == 1)
304 				ret = 0;
305 		} else {
306 			printk(VLAN_ERR
307 			       "%s: ERROR:	Tried to remove a non-vlan device "
308 			       "with VLAN code, name: %s  priv_flags: %hX\n",
309 			       __FUNCTION__, dev->name, dev->priv_flags);
310 			dev_put(dev);
311 			ret = -EPERM;
312 		}
313 	} else {
314 #ifdef VLAN_DEBUG
315 		printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
316 #endif
317 		ret = -EINVAL;
318 	}
319 
320 	return ret;
321 }
322 
323 static void vlan_setup(struct net_device *new_dev)
324 {
325 	SET_MODULE_OWNER(new_dev);
326 
327 	/* new_dev->ifindex = 0;  it will be set when added to
328 	 * the global list.
329 	 * iflink is set as well.
330 	 */
331 	new_dev->get_stats = vlan_dev_get_stats;
332 
333 	/* Make this thing known as a VLAN device */
334 	new_dev->priv_flags |= IFF_802_1Q_VLAN;
335 
336 	/* Set us up to have no queue, as the underlying Hardware device
337 	 * can do all the queueing we could want.
338 	 */
339 	new_dev->tx_queue_len = 0;
340 
341 	/* set up method calls */
342 	new_dev->change_mtu = vlan_dev_change_mtu;
343 	new_dev->open = vlan_dev_open;
344 	new_dev->stop = vlan_dev_stop;
345 	new_dev->set_mac_address = vlan_dev_set_mac_address;
346 	new_dev->set_multicast_list = vlan_dev_set_multicast_list;
347 	new_dev->destructor = free_netdev;
348 	new_dev->do_ioctl = vlan_dev_ioctl;
349 }
350 
351 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
352 {
353 	/* Have to respect userspace enforced dormant state
354 	 * of real device, also must allow supplicant running
355 	 * on VLAN device
356 	 */
357 	if (dev->operstate == IF_OPER_DORMANT)
358 		netif_dormant_on(vlandev);
359 	else
360 		netif_dormant_off(vlandev);
361 
362 	if (netif_carrier_ok(dev)) {
363 		if (!netif_carrier_ok(vlandev))
364 			netif_carrier_on(vlandev);
365 	} else {
366 		if (netif_carrier_ok(vlandev))
367 			netif_carrier_off(vlandev);
368 	}
369 }
370 
371 /*
372  * vlan network devices have devices nesting below it, and are a special
373  * "super class" of normal network devices; split their locks off into a
374  * separate class since they always nest.
375  */
376 static struct lock_class_key vlan_netdev_xmit_lock_key;
377 
378 
379 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
380  *  Returns the device that was created, or NULL if there was
381  *  an error of some kind.
382  */
383 static struct net_device *register_vlan_device(const char *eth_IF_name,
384 					       unsigned short VLAN_ID)
385 {
386 	struct vlan_group *grp;
387 	struct net_device *new_dev;
388 	struct net_device *real_dev; /* the ethernet device */
389 	char name[IFNAMSIZ];
390 	int i;
391 
392 #ifdef VLAN_DEBUG
393 	printk(VLAN_DBG "%s: if_name -:%s:-	vid: %i\n",
394 		__FUNCTION__, eth_IF_name, VLAN_ID);
395 #endif
396 
397 	if (VLAN_ID >= VLAN_VID_MASK)
398 		goto out_ret_null;
399 
400 	/* find the device relating to eth_IF_name. */
401 	real_dev = dev_get_by_name(eth_IF_name);
402 	if (!real_dev)
403 		goto out_ret_null;
404 
405 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
406 		printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
407 			__FUNCTION__, real_dev->name);
408 		goto out_put_dev;
409 	}
410 
411 	if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
412 	    (real_dev->vlan_rx_register == NULL ||
413 	     real_dev->vlan_rx_kill_vid == NULL)) {
414 		printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
415 			__FUNCTION__, real_dev->name);
416 		goto out_put_dev;
417 	}
418 
419 	if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
420 	    (real_dev->vlan_rx_add_vid == NULL ||
421 	     real_dev->vlan_rx_kill_vid == NULL)) {
422 		printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
423 			__FUNCTION__, real_dev->name);
424 		goto out_put_dev;
425 	}
426 
427 	/* From this point on, all the data structures must remain
428 	 * consistent.
429 	 */
430 	rtnl_lock();
431 
432 	/* The real device must be up and operating in order to
433 	 * assosciate a VLAN device with it.
434 	 */
435 	if (!(real_dev->flags & IFF_UP))
436 		goto out_unlock;
437 
438 	if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
439 		/* was already registered. */
440 		printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
441 		goto out_unlock;
442 	}
443 
444 	/* Gotta set up the fields for the device. */
445 #ifdef VLAN_DEBUG
446 	printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
447 	       vlan_name_type);
448 #endif
449 	switch (vlan_name_type) {
450 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
451 		/* name will look like:	 eth1.0005 */
452 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
453 		break;
454 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
455 		/* Put our vlan.VID in the name.
456 		 * Name will look like:	 vlan5
457 		 */
458 		snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
459 		break;
460 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
461 		/* Put our vlan.VID in the name.
462 		 * Name will look like:	 eth0.5
463 		 */
464 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
465 		break;
466 	case VLAN_NAME_TYPE_PLUS_VID:
467 		/* Put our vlan.VID in the name.
468 		 * Name will look like:	 vlan0005
469 		 */
470 	default:
471 		snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
472 	}
473 
474 	new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
475 			       vlan_setup);
476 
477 	if (new_dev == NULL)
478 		goto out_unlock;
479 
480 #ifdef VLAN_DEBUG
481 	printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
482 #endif
483 	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
484 	new_dev->flags = real_dev->flags;
485 	new_dev->flags &= ~IFF_UP;
486 
487 	new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
488 					     (1<<__LINK_STATE_DORMANT))) |
489 			 (1<<__LINK_STATE_PRESENT);
490 
491 	/* need 4 bytes for extra VLAN header info,
492 	 * hope the underlying device can handle it.
493 	 */
494 	new_dev->mtu = real_dev->mtu;
495 
496 	/* TODO: maybe just assign it to be ETHERNET? */
497 	new_dev->type = real_dev->type;
498 
499 	new_dev->hard_header_len = real_dev->hard_header_len;
500 	if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
501 		/* Regular ethernet + 4 bytes (18 total). */
502 		new_dev->hard_header_len += VLAN_HLEN;
503 	}
504 
505 	VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
506 		     new_dev->priv,
507 		     sizeof(struct vlan_dev_info));
508 
509 	memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
510 	memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
511 	new_dev->addr_len = real_dev->addr_len;
512 
513 	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
514 		new_dev->hard_header = real_dev->hard_header;
515 		new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
516 		new_dev->rebuild_header = real_dev->rebuild_header;
517 	} else {
518 		new_dev->hard_header = vlan_dev_hard_header;
519 		new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
520 		new_dev->rebuild_header = vlan_dev_rebuild_header;
521 	}
522 	new_dev->hard_header_parse = real_dev->hard_header_parse;
523 
524 	VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
525 	VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
526 	VLAN_DEV_INFO(new_dev)->dent = NULL;
527 	VLAN_DEV_INFO(new_dev)->flags = 1;
528 
529 #ifdef VLAN_DEBUG
530 	printk(VLAN_DBG "About to go find the group for idx: %i\n",
531 	       real_dev->ifindex);
532 #endif
533 
534 	if (register_netdevice(new_dev))
535 		goto out_free_newdev;
536 
537 	lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
538 
539 	new_dev->iflink = real_dev->ifindex;
540 	vlan_transfer_operstate(real_dev, new_dev);
541 	linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
542 
543 	/* So, got the sucker initialized, now lets place
544 	 * it into our local structure.
545 	 */
546 	grp = __vlan_find_group(real_dev->ifindex);
547 
548 	/* Note, we are running under the RTNL semaphore
549 	 * so it cannot "appear" on us.
550 	 */
551 	if (!grp) { /* need to add a new group */
552 		grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
553 		if (!grp)
554 			goto out_free_unregister;
555 
556 		for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
557 			grp->vlan_devices_arrays[i] = kzalloc(
558 				sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
559 				GFP_KERNEL);
560 
561 			if (!grp->vlan_devices_arrays[i])
562 				goto out_free_arrays;
563 		}
564 
565 		/* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
566 		grp->real_dev_ifindex = real_dev->ifindex;
567 
568 		hlist_add_head_rcu(&grp->hlist,
569 				   &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
570 
571 		if (real_dev->features & NETIF_F_HW_VLAN_RX)
572 			real_dev->vlan_rx_register(real_dev, grp);
573 	}
574 
575 	vlan_group_set_device(grp, VLAN_ID, new_dev);
576 
577 	if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
578 		printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
579 							 new_dev->name);
580 
581 	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
582 		real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
583 
584 	rtnl_unlock();
585 
586 
587 #ifdef VLAN_DEBUG
588 	printk(VLAN_DBG "Allocated new device successfully, returning.\n");
589 #endif
590 	return new_dev;
591 
592 out_free_arrays:
593 	vlan_group_free(grp);
594 
595 out_free_unregister:
596 	unregister_netdev(new_dev);
597 	goto out_unlock;
598 
599 out_free_newdev:
600 	free_netdev(new_dev);
601 
602 out_unlock:
603 	rtnl_unlock();
604 
605 out_put_dev:
606 	dev_put(real_dev);
607 
608 out_ret_null:
609 	return NULL;
610 }
611 
612 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
613 {
614 	struct net_device *dev = ptr;
615 	struct vlan_group *grp = __vlan_find_group(dev->ifindex);
616 	int i, flgs;
617 	struct net_device *vlandev;
618 
619 	if (!grp)
620 		goto out;
621 
622 	/* It is OK that we do not hold the group lock right now,
623 	 * as we run under the RTNL lock.
624 	 */
625 
626 	switch (event) {
627 	case NETDEV_CHANGE:
628 		/* Propagate real device state to vlan devices */
629 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
630 			vlandev = vlan_group_get_device(grp, i);
631 			if (!vlandev)
632 				continue;
633 
634 			vlan_transfer_operstate(dev, vlandev);
635 		}
636 		break;
637 
638 	case NETDEV_DOWN:
639 		/* Put all VLANs for this dev in the down state too.  */
640 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
641 			vlandev = vlan_group_get_device(grp, i);
642 			if (!vlandev)
643 				continue;
644 
645 			flgs = vlandev->flags;
646 			if (!(flgs & IFF_UP))
647 				continue;
648 
649 			dev_change_flags(vlandev, flgs & ~IFF_UP);
650 		}
651 		break;
652 
653 	case NETDEV_UP:
654 		/* Put all VLANs for this dev in the up state too.  */
655 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
656 			vlandev = vlan_group_get_device(grp, i);
657 			if (!vlandev)
658 				continue;
659 
660 			flgs = vlandev->flags;
661 			if (flgs & IFF_UP)
662 				continue;
663 
664 			dev_change_flags(vlandev, flgs | IFF_UP);
665 		}
666 		break;
667 
668 	case NETDEV_UNREGISTER:
669 		/* Delete all VLANs for this dev. */
670 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
671 			int ret;
672 
673 			vlandev = vlan_group_get_device(grp, i);
674 			if (!vlandev)
675 				continue;
676 
677 			ret = unregister_vlan_dev(dev,
678 						  VLAN_DEV_INFO(vlandev)->vlan_id);
679 
680 			unregister_netdevice(vlandev);
681 
682 			/* Group was destroyed? */
683 			if (ret == 1)
684 				break;
685 		}
686 		break;
687 	}
688 
689 out:
690 	return NOTIFY_DONE;
691 }
692 
693 /*
694  *	VLAN IOCTL handler.
695  *	o execute requested action or pass command to the device driver
696  *   arg is really a struct vlan_ioctl_args __user *.
697  */
698 static int vlan_ioctl_handler(void __user *arg)
699 {
700 	int err = 0;
701 	unsigned short vid = 0;
702 	struct vlan_ioctl_args args;
703 
704 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
705 		return -EFAULT;
706 
707 	/* Null terminate this sucker, just in case. */
708 	args.device1[23] = 0;
709 	args.u.device2[23] = 0;
710 
711 #ifdef VLAN_DEBUG
712 	printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
713 #endif
714 
715 	switch (args.cmd) {
716 	case SET_VLAN_INGRESS_PRIORITY_CMD:
717 		if (!capable(CAP_NET_ADMIN))
718 			return -EPERM;
719 		err = vlan_dev_set_ingress_priority(args.device1,
720 						    args.u.skb_priority,
721 						    args.vlan_qos);
722 		break;
723 
724 	case SET_VLAN_EGRESS_PRIORITY_CMD:
725 		if (!capable(CAP_NET_ADMIN))
726 			return -EPERM;
727 		err = vlan_dev_set_egress_priority(args.device1,
728 						   args.u.skb_priority,
729 						   args.vlan_qos);
730 		break;
731 
732 	case SET_VLAN_FLAG_CMD:
733 		if (!capable(CAP_NET_ADMIN))
734 			return -EPERM;
735 		err = vlan_dev_set_vlan_flag(args.device1,
736 					     args.u.flag,
737 					     args.vlan_qos);
738 		break;
739 
740 	case SET_VLAN_NAME_TYPE_CMD:
741 		if (!capable(CAP_NET_ADMIN))
742 			return -EPERM;
743 		if ((args.u.name_type >= 0) &&
744 		    (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
745 			vlan_name_type = args.u.name_type;
746 			err = 0;
747 		} else {
748 			err = -EINVAL;
749 		}
750 		break;
751 
752 	case ADD_VLAN_CMD:
753 		if (!capable(CAP_NET_ADMIN))
754 			return -EPERM;
755 		/* we have been given the name of the Ethernet Device we want to
756 		 * talk to:  args.dev1	 We also have the
757 		 * VLAN ID:  args.u.VID
758 		 */
759 		if (register_vlan_device(args.device1, args.u.VID)) {
760 			err = 0;
761 		} else {
762 			err = -EINVAL;
763 		}
764 		break;
765 
766 	case DEL_VLAN_CMD:
767 		if (!capable(CAP_NET_ADMIN))
768 			return -EPERM;
769 		/* Here, the args.dev1 is the actual VLAN we want
770 		 * to get rid of.
771 		 */
772 		err = unregister_vlan_device(args.device1);
773 		break;
774 
775 	case GET_VLAN_INGRESS_PRIORITY_CMD:
776 		/* TODO:  Implement
777 		   err = vlan_dev_get_ingress_priority(args);
778 		   if (copy_to_user((void*)arg, &args,
779 			sizeof(struct vlan_ioctl_args))) {
780 			err = -EFAULT;
781 		   }
782 		*/
783 		err = -EINVAL;
784 		break;
785 	case GET_VLAN_EGRESS_PRIORITY_CMD:
786 		/* TODO:  Implement
787 		   err = vlan_dev_get_egress_priority(args.device1, &(args.args);
788 		   if (copy_to_user((void*)arg, &args,
789 			sizeof(struct vlan_ioctl_args))) {
790 			err = -EFAULT;
791 		   }
792 		*/
793 		err = -EINVAL;
794 		break;
795 	case GET_VLAN_REALDEV_NAME_CMD:
796 		err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
797 		if (err)
798 			goto out;
799 		if (copy_to_user(arg, &args,
800 				 sizeof(struct vlan_ioctl_args))) {
801 			err = -EFAULT;
802 		}
803 		break;
804 
805 	case GET_VLAN_VID_CMD:
806 		err = vlan_dev_get_vid(args.device1, &vid);
807 		if (err)
808 			goto out;
809 		args.u.VID = vid;
810 		if (copy_to_user(arg, &args,
811 				 sizeof(struct vlan_ioctl_args))) {
812 		      err = -EFAULT;
813 		}
814 		break;
815 
816 	default:
817 		/* pass on to underlying device instead?? */
818 		printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
819 			__FUNCTION__, args.cmd);
820 		return -EINVAL;
821 	}
822 out:
823 	return err;
824 }
825 
826 MODULE_LICENSE("GPL");
827 MODULE_VERSION(DRV_VERSION);
828