xref: /openbmc/linux/net/8021q/vlan.c (revision 64c70b1c)
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 & NETIF_F_HW_VLAN_FILTER)
244 				real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
245 
246 			vlan_group_set_device(grp, vlan_id, NULL);
247 			synchronize_net();
248 
249 
250 			/* Caller unregisters (and if necessary, puts)
251 			 * VLAN device, but we get rid of the reference to
252 			 * real_dev here.
253 			 */
254 			dev_put(real_dev);
255 
256 			/* If the group is now empty, kill off the
257 			 * group.
258 			 */
259 			for (i = 0; i < VLAN_VID_MASK; i++)
260 				if (vlan_group_get_device(grp, i))
261 					break;
262 
263 			if (i == VLAN_VID_MASK) {
264 				if (real_dev->features & NETIF_F_HW_VLAN_RX)
265 					real_dev->vlan_rx_register(real_dev, NULL);
266 
267 				hlist_del_rcu(&grp->hlist);
268 
269 				/* Free the group, after all cpu's are done. */
270 				call_rcu(&grp->rcu, vlan_rcu_free);
271 
272 				grp = NULL;
273 				ret = 1;
274 			}
275 		}
276 	}
277 
278 	return ret;
279 }
280 
281 static int unregister_vlan_device(const char *vlan_IF_name)
282 {
283 	struct net_device *dev = NULL;
284 	int ret;
285 
286 
287 	dev = dev_get_by_name(vlan_IF_name);
288 	ret = -EINVAL;
289 	if (dev) {
290 		if (dev->priv_flags & IFF_802_1Q_VLAN) {
291 			rtnl_lock();
292 
293 			ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
294 						  VLAN_DEV_INFO(dev)->vlan_id);
295 
296 			dev_put(dev);
297 			unregister_netdevice(dev);
298 
299 			rtnl_unlock();
300 
301 			if (ret == 1)
302 				ret = 0;
303 		} else {
304 			printk(VLAN_ERR
305 			       "%s: ERROR:	Tried to remove a non-vlan device "
306 			       "with VLAN code, name: %s  priv_flags: %hX\n",
307 			       __FUNCTION__, dev->name, dev->priv_flags);
308 			dev_put(dev);
309 			ret = -EPERM;
310 		}
311 	} else {
312 #ifdef VLAN_DEBUG
313 		printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
314 #endif
315 		ret = -EINVAL;
316 	}
317 
318 	return ret;
319 }
320 
321 static void vlan_setup(struct net_device *new_dev)
322 {
323 	SET_MODULE_OWNER(new_dev);
324 
325 	/* new_dev->ifindex = 0;  it will be set when added to
326 	 * the global list.
327 	 * iflink is set as well.
328 	 */
329 	new_dev->get_stats = vlan_dev_get_stats;
330 
331 	/* Make this thing known as a VLAN device */
332 	new_dev->priv_flags |= IFF_802_1Q_VLAN;
333 
334 	/* Set us up to have no queue, as the underlying Hardware device
335 	 * can do all the queueing we could want.
336 	 */
337 	new_dev->tx_queue_len = 0;
338 
339 	/* set up method calls */
340 	new_dev->change_mtu = vlan_dev_change_mtu;
341 	new_dev->open = vlan_dev_open;
342 	new_dev->stop = vlan_dev_stop;
343 	new_dev->set_mac_address = vlan_dev_set_mac_address;
344 	new_dev->set_multicast_list = vlan_dev_set_multicast_list;
345 	new_dev->destructor = free_netdev;
346 	new_dev->do_ioctl = vlan_dev_ioctl;
347 }
348 
349 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
350 {
351 	/* Have to respect userspace enforced dormant state
352 	 * of real device, also must allow supplicant running
353 	 * on VLAN device
354 	 */
355 	if (dev->operstate == IF_OPER_DORMANT)
356 		netif_dormant_on(vlandev);
357 	else
358 		netif_dormant_off(vlandev);
359 
360 	if (netif_carrier_ok(dev)) {
361 		if (!netif_carrier_ok(vlandev))
362 			netif_carrier_on(vlandev);
363 	} else {
364 		if (netif_carrier_ok(vlandev))
365 			netif_carrier_off(vlandev);
366 	}
367 }
368 
369 /*
370  * vlan network devices have devices nesting below it, and are a special
371  * "super class" of normal network devices; split their locks off into a
372  * separate class since they always nest.
373  */
374 static struct lock_class_key vlan_netdev_xmit_lock_key;
375 
376 
377 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
378  *  Returns the device that was created, or NULL if there was
379  *  an error of some kind.
380  */
381 static struct net_device *register_vlan_device(const char *eth_IF_name,
382 					       unsigned short VLAN_ID)
383 {
384 	struct vlan_group *grp;
385 	struct net_device *new_dev;
386 	struct net_device *real_dev; /* the ethernet device */
387 	char name[IFNAMSIZ];
388 	int i;
389 
390 #ifdef VLAN_DEBUG
391 	printk(VLAN_DBG "%s: if_name -:%s:-	vid: %i\n",
392 		__FUNCTION__, eth_IF_name, VLAN_ID);
393 #endif
394 
395 	if (VLAN_ID >= VLAN_VID_MASK)
396 		goto out_ret_null;
397 
398 	/* find the device relating to eth_IF_name. */
399 	real_dev = dev_get_by_name(eth_IF_name);
400 	if (!real_dev)
401 		goto out_ret_null;
402 
403 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
404 		printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
405 			__FUNCTION__, real_dev->name);
406 		goto out_put_dev;
407 	}
408 
409 	if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
410 	    !real_dev->vlan_rx_register) {
411 		printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
412 			__FUNCTION__, real_dev->name);
413 		goto out_put_dev;
414 	}
415 
416 	if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
417 	    (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
418 		printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
419 			__FUNCTION__, real_dev->name);
420 		goto out_put_dev;
421 	}
422 
423 	/* From this point on, all the data structures must remain
424 	 * consistent.
425 	 */
426 	rtnl_lock();
427 
428 	/* The real device must be up and operating in order to
429 	 * assosciate a VLAN device with it.
430 	 */
431 	if (!(real_dev->flags & IFF_UP))
432 		goto out_unlock;
433 
434 	if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
435 		/* was already registered. */
436 		printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
437 		goto out_unlock;
438 	}
439 
440 	/* Gotta set up the fields for the device. */
441 #ifdef VLAN_DEBUG
442 	printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
443 	       vlan_name_type);
444 #endif
445 	switch (vlan_name_type) {
446 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
447 		/* name will look like:	 eth1.0005 */
448 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
449 		break;
450 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
451 		/* Put our vlan.VID in the name.
452 		 * Name will look like:	 vlan5
453 		 */
454 		snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
455 		break;
456 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
457 		/* Put our vlan.VID in the name.
458 		 * Name will look like:	 eth0.5
459 		 */
460 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
461 		break;
462 	case VLAN_NAME_TYPE_PLUS_VID:
463 		/* Put our vlan.VID in the name.
464 		 * Name will look like:	 vlan0005
465 		 */
466 	default:
467 		snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
468 	}
469 
470 	new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
471 			       vlan_setup);
472 
473 	if (new_dev == NULL)
474 		goto out_unlock;
475 
476 #ifdef VLAN_DEBUG
477 	printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
478 #endif
479 	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
480 	new_dev->flags = real_dev->flags;
481 	new_dev->flags &= ~IFF_UP;
482 
483 	new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
484 					     (1<<__LINK_STATE_DORMANT))) |
485 			 (1<<__LINK_STATE_PRESENT);
486 
487 	/* need 4 bytes for extra VLAN header info,
488 	 * hope the underlying device can handle it.
489 	 */
490 	new_dev->mtu = real_dev->mtu;
491 
492 	/* TODO: maybe just assign it to be ETHERNET? */
493 	new_dev->type = real_dev->type;
494 
495 	new_dev->hard_header_len = real_dev->hard_header_len;
496 	if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
497 		/* Regular ethernet + 4 bytes (18 total). */
498 		new_dev->hard_header_len += VLAN_HLEN;
499 	}
500 
501 	VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
502 		     new_dev->priv,
503 		     sizeof(struct vlan_dev_info));
504 
505 	memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
506 	memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
507 	new_dev->addr_len = real_dev->addr_len;
508 
509 	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
510 		new_dev->hard_header = real_dev->hard_header;
511 		new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
512 		new_dev->rebuild_header = real_dev->rebuild_header;
513 	} else {
514 		new_dev->hard_header = vlan_dev_hard_header;
515 		new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
516 		new_dev->rebuild_header = vlan_dev_rebuild_header;
517 	}
518 	new_dev->hard_header_parse = real_dev->hard_header_parse;
519 
520 	VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
521 	VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
522 	VLAN_DEV_INFO(new_dev)->dent = NULL;
523 	VLAN_DEV_INFO(new_dev)->flags = 1;
524 
525 #ifdef VLAN_DEBUG
526 	printk(VLAN_DBG "About to go find the group for idx: %i\n",
527 	       real_dev->ifindex);
528 #endif
529 
530 	if (register_netdevice(new_dev))
531 		goto out_free_newdev;
532 
533 	lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
534 
535 	new_dev->iflink = real_dev->ifindex;
536 	vlan_transfer_operstate(real_dev, new_dev);
537 	linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
538 
539 	/* So, got the sucker initialized, now lets place
540 	 * it into our local structure.
541 	 */
542 	grp = __vlan_find_group(real_dev->ifindex);
543 
544 	/* Note, we are running under the RTNL semaphore
545 	 * so it cannot "appear" on us.
546 	 */
547 	if (!grp) { /* need to add a new group */
548 		grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
549 		if (!grp)
550 			goto out_free_unregister;
551 
552 		for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
553 			grp->vlan_devices_arrays[i] = kzalloc(
554 				sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
555 				GFP_KERNEL);
556 
557 			if (!grp->vlan_devices_arrays[i])
558 				goto out_free_arrays;
559 		}
560 
561 		/* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
562 		grp->real_dev_ifindex = real_dev->ifindex;
563 
564 		hlist_add_head_rcu(&grp->hlist,
565 				   &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
566 
567 		if (real_dev->features & NETIF_F_HW_VLAN_RX)
568 			real_dev->vlan_rx_register(real_dev, grp);
569 	}
570 
571 	vlan_group_set_device(grp, VLAN_ID, new_dev);
572 
573 	if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
574 		printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
575 							 new_dev->name);
576 
577 	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
578 		real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
579 
580 	rtnl_unlock();
581 
582 
583 #ifdef VLAN_DEBUG
584 	printk(VLAN_DBG "Allocated new device successfully, returning.\n");
585 #endif
586 	return new_dev;
587 
588 out_free_arrays:
589 	vlan_group_free(grp);
590 
591 out_free_unregister:
592 	unregister_netdev(new_dev);
593 	goto out_unlock;
594 
595 out_free_newdev:
596 	free_netdev(new_dev);
597 
598 out_unlock:
599 	rtnl_unlock();
600 
601 out_put_dev:
602 	dev_put(real_dev);
603 
604 out_ret_null:
605 	return NULL;
606 }
607 
608 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
609 {
610 	struct net_device *dev = ptr;
611 	struct vlan_group *grp = __vlan_find_group(dev->ifindex);
612 	int i, flgs;
613 	struct net_device *vlandev;
614 
615 	if (!grp)
616 		goto out;
617 
618 	/* It is OK that we do not hold the group lock right now,
619 	 * as we run under the RTNL lock.
620 	 */
621 
622 	switch (event) {
623 	case NETDEV_CHANGE:
624 		/* Propagate real device state to vlan devices */
625 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
626 			vlandev = vlan_group_get_device(grp, i);
627 			if (!vlandev)
628 				continue;
629 
630 			vlan_transfer_operstate(dev, vlandev);
631 		}
632 		break;
633 
634 	case NETDEV_DOWN:
635 		/* Put all VLANs for this dev in the down state too.  */
636 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
637 			vlandev = vlan_group_get_device(grp, i);
638 			if (!vlandev)
639 				continue;
640 
641 			flgs = vlandev->flags;
642 			if (!(flgs & IFF_UP))
643 				continue;
644 
645 			dev_change_flags(vlandev, flgs & ~IFF_UP);
646 		}
647 		break;
648 
649 	case NETDEV_UP:
650 		/* Put all VLANs for this dev in the up state too.  */
651 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
652 			vlandev = vlan_group_get_device(grp, i);
653 			if (!vlandev)
654 				continue;
655 
656 			flgs = vlandev->flags;
657 			if (flgs & IFF_UP)
658 				continue;
659 
660 			dev_change_flags(vlandev, flgs | IFF_UP);
661 		}
662 		break;
663 
664 	case NETDEV_UNREGISTER:
665 		/* Delete all VLANs for this dev. */
666 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
667 			int ret;
668 
669 			vlandev = vlan_group_get_device(grp, i);
670 			if (!vlandev)
671 				continue;
672 
673 			ret = unregister_vlan_dev(dev,
674 						  VLAN_DEV_INFO(vlandev)->vlan_id);
675 
676 			unregister_netdevice(vlandev);
677 
678 			/* Group was destroyed? */
679 			if (ret == 1)
680 				break;
681 		}
682 		break;
683 	}
684 
685 out:
686 	return NOTIFY_DONE;
687 }
688 
689 /*
690  *	VLAN IOCTL handler.
691  *	o execute requested action or pass command to the device driver
692  *   arg is really a struct vlan_ioctl_args __user *.
693  */
694 static int vlan_ioctl_handler(void __user *arg)
695 {
696 	int err = 0;
697 	unsigned short vid = 0;
698 	struct vlan_ioctl_args args;
699 
700 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
701 		return -EFAULT;
702 
703 	/* Null terminate this sucker, just in case. */
704 	args.device1[23] = 0;
705 	args.u.device2[23] = 0;
706 
707 #ifdef VLAN_DEBUG
708 	printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
709 #endif
710 
711 	switch (args.cmd) {
712 	case SET_VLAN_INGRESS_PRIORITY_CMD:
713 		if (!capable(CAP_NET_ADMIN))
714 			return -EPERM;
715 		err = vlan_dev_set_ingress_priority(args.device1,
716 						    args.u.skb_priority,
717 						    args.vlan_qos);
718 		break;
719 
720 	case SET_VLAN_EGRESS_PRIORITY_CMD:
721 		if (!capable(CAP_NET_ADMIN))
722 			return -EPERM;
723 		err = vlan_dev_set_egress_priority(args.device1,
724 						   args.u.skb_priority,
725 						   args.vlan_qos);
726 		break;
727 
728 	case SET_VLAN_FLAG_CMD:
729 		if (!capable(CAP_NET_ADMIN))
730 			return -EPERM;
731 		err = vlan_dev_set_vlan_flag(args.device1,
732 					     args.u.flag,
733 					     args.vlan_qos);
734 		break;
735 
736 	case SET_VLAN_NAME_TYPE_CMD:
737 		if (!capable(CAP_NET_ADMIN))
738 			return -EPERM;
739 		if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
740 			vlan_name_type = args.u.name_type;
741 			err = 0;
742 		} else {
743 			err = -EINVAL;
744 		}
745 		break;
746 
747 	case ADD_VLAN_CMD:
748 		if (!capable(CAP_NET_ADMIN))
749 			return -EPERM;
750 		/* we have been given the name of the Ethernet Device we want to
751 		 * talk to:  args.dev1	 We also have the
752 		 * VLAN ID:  args.u.VID
753 		 */
754 		if (register_vlan_device(args.device1, args.u.VID)) {
755 			err = 0;
756 		} else {
757 			err = -EINVAL;
758 		}
759 		break;
760 
761 	case DEL_VLAN_CMD:
762 		if (!capable(CAP_NET_ADMIN))
763 			return -EPERM;
764 		/* Here, the args.dev1 is the actual VLAN we want
765 		 * to get rid of.
766 		 */
767 		err = unregister_vlan_device(args.device1);
768 		break;
769 
770 	case GET_VLAN_INGRESS_PRIORITY_CMD:
771 		/* TODO:  Implement
772 		   err = vlan_dev_get_ingress_priority(args);
773 		   if (copy_to_user((void*)arg, &args,
774 			sizeof(struct vlan_ioctl_args))) {
775 			err = -EFAULT;
776 		   }
777 		*/
778 		err = -EINVAL;
779 		break;
780 	case GET_VLAN_EGRESS_PRIORITY_CMD:
781 		/* TODO:  Implement
782 		   err = vlan_dev_get_egress_priority(args.device1, &(args.args);
783 		   if (copy_to_user((void*)arg, &args,
784 			sizeof(struct vlan_ioctl_args))) {
785 			err = -EFAULT;
786 		   }
787 		*/
788 		err = -EINVAL;
789 		break;
790 	case GET_VLAN_REALDEV_NAME_CMD:
791 		err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
792 		if (err)
793 			goto out;
794 		if (copy_to_user(arg, &args,
795 				 sizeof(struct vlan_ioctl_args))) {
796 			err = -EFAULT;
797 		}
798 		break;
799 
800 	case GET_VLAN_VID_CMD:
801 		err = vlan_dev_get_vid(args.device1, &vid);
802 		if (err)
803 			goto out;
804 		args.u.VID = vid;
805 		if (copy_to_user(arg, &args,
806 				 sizeof(struct vlan_ioctl_args))) {
807 		      err = -EFAULT;
808 		}
809 		break;
810 
811 	default:
812 		/* pass on to underlying device instead?? */
813 		printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
814 			__FUNCTION__, args.cmd);
815 		return -EINVAL;
816 	}
817 out:
818 	return err;
819 }
820 
821 MODULE_LICENSE("GPL");
822 MODULE_VERSION(DRV_VERSION);
823