net/8021q/vlan.c - kernel/msm-4.19 - Gitiles

 /*
  * INET		802.1Q VLAN
  *		Ethernet-type device handling.
  *
  * Authors:	Ben Greear <greearb@candelatech.com>
  *              Please send support related email to: vlan@scry.wanfear.com
  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
  *
  * Fixes:
  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  *		Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  *		Correct all the locking - David S. Miller <davem@redhat.com>;
  *		Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  *
  *		This program is free software; you can redistribute it and/or
  *		modify it under the terms of the GNU General Public License
  *		as published by the Free Software Foundation; either version
  *		2 of the License, or (at your option) any later version.
  */

 #include <asm/uaccess.h> /* for copy_from_user */
 #include <linux/capability.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <net/datalink.h>
 #include <linux/mm.h>
 #include <linux/in.h>
 #include <linux/init.h>
 #include <net/p8022.h>
 #include <net/arp.h>
 #include <linux/rtnetlink.h>
 #include <linux/notifier.h>

 #include <linux/if_vlan.h>
 #include "vlan.h"
 #include "vlanproc.h"

 #define DRV_VERSION "1.8"

 /* Global VLAN variables */

 /* Our listing of VLAN group(s) */
 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
 #define vlan_grp_hashfn(IDX)	((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)

 static char vlan_fullname[] = "802.1Q VLAN Support";
 static char vlan_version[] = DRV_VERSION;
 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";

 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
 static int vlan_ioctl_handler(void __user *);
 static int unregister_vlan_dev(struct net_device *, unsigned short );

 static struct notifier_block vlan_notifier_block = {
 	.notifier_call = vlan_device_event,
 };

 /* These may be changed at run-time through IOCTLs */

 /* Determines interface naming scheme. */
 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;

 static struct packet_type vlan_packet_type = {
 	.type = __constant_htons(ETH_P_8021Q),
 	.func = vlan_skb_recv, /* VLAN receive method */
 };

 /* End of global variables definitions. */

 /*
  * Function vlan_proto_init (pro)
  *
  *    Initialize VLAN protocol layer,
  *
  */
 static int __init vlan_proto_init(void)
 {
 	int err;

 	printk(VLAN_INF "%s v%s %s\n",
 	       vlan_fullname, vlan_version, vlan_copyright);
 	printk(VLAN_INF "All bugs added by %s\n",
 	       vlan_buggyright);

 	/* proc file system initialization */
 	err = vlan_proc_init();
 	if (err < 0) {
 		printk(KERN_ERR
 		       "%s %s: can't create entry in proc filesystem!\n",
 		       __FUNCTION__, VLAN_NAME);
 		return err;
 	}

 	dev_add_pack(&vlan_packet_type);

 	/* Register us to receive netdevice events */
 	err = register_netdevice_notifier(&vlan_notifier_block);
 	if (err < 0)
 		goto err1;

 	err = vlan_netlink_init();
 	if (err < 0)
 		goto err2;

 	vlan_ioctl_set(vlan_ioctl_handler);
 	return 0;

 err2:
 	unregister_netdevice_notifier(&vlan_notifier_block);
 err1:
 	vlan_proc_cleanup();
 	dev_remove_pack(&vlan_packet_type);
 	return err;
 }

 /*
  *     Module 'remove' entry point.
  *     o delete /proc/net/router directory and static entries.
  */
 static void __exit vlan_cleanup_module(void)
 {
 	int i;

 	vlan_netlink_fini();
 	vlan_ioctl_set(NULL);

 	/* Un-register us from receiving netdevice events */
 	unregister_netdevice_notifier(&vlan_notifier_block);

 	dev_remove_pack(&vlan_packet_type);

 	/* This table must be empty if there are no module
 	 * references left.
 	 */
 	for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 		BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 	}
 	vlan_proc_cleanup();

 	synchronize_net();
 }

 module_init(vlan_proto_init);
 module_exit(vlan_cleanup_module);

 /* Must be invoked with RCU read lock (no preempt) */
 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 {
 	struct vlan_group *grp;
 	struct hlist_node *n;
 	int hash = vlan_grp_hashfn(real_dev_ifindex);

 	hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 		if (grp->real_dev_ifindex == real_dev_ifindex)
 			return grp;
 	}

 	return NULL;
 }

 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  *
  * Must be invoked with RCU read lock (no preempt)
  */
 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 				   unsigned short VID)
 {
 	struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);

 	if (grp)
 		return vlan_group_get_device(grp, VID);

 	return NULL;
 }

 static void vlan_group_free(struct vlan_group *grp)
 {
 	int i;

 	for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 		kfree(grp->vlan_devices_arrays[i]);
 	kfree(grp);
 }

 static struct vlan_group *vlan_group_alloc(int ifindex)
 {
 	struct vlan_group *grp;
 	unsigned int size;
 	unsigned int i;

 	grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 	if (!grp)
 		return NULL;

 	size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;

 	for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 		grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
 		if (!grp->vlan_devices_arrays[i])
 			goto err;
 	}

 	grp->real_dev_ifindex = ifindex;
 	hlist_add_head_rcu(&grp->hlist,
 			   &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
 	return grp;

 err:
 	vlan_group_free(grp);
 	return NULL;
 }

 static void vlan_rcu_free(struct rcu_head *rcu)
 {
 	vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 }


 /* This returns 0 if everything went fine.
  * It will return 1 if the group was killed as a result.
  * A negative return indicates failure.
  *
  * The RTNL lock must be held.
  */
 static int unregister_vlan_dev(struct net_device *real_dev,
 			       unsigned short vlan_id)
 {
 	struct net_device *dev = NULL;
 	int real_dev_ifindex = real_dev->ifindex;
 	struct vlan_group *grp;
 	int i, ret;

 #ifdef VLAN_DEBUG
 	printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 #endif

 	/* sanity check */
 	if (vlan_id >= VLAN_VID_MASK)
 		return -EINVAL;

 	ASSERT_RTNL();
 	grp = __vlan_find_group(real_dev_ifindex);

 	ret = 0;

 	if (grp) {
 		dev = vlan_group_get_device(grp, vlan_id);
 		if (dev) {
 			/* Remove proc entry */
 			vlan_proc_rem_dev(dev);

 			/* Take it out of our own structures, but be sure to
 			 * interlock with HW accelerating devices or SW vlan
 			 * input packet processing.
 			 */
 			if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 				real_dev->vlan_rx_kill_vid(real_dev, vlan_id);

 			vlan_group_set_device(grp, vlan_id, NULL);
 			synchronize_net();


 			/* Caller unregisters (and if necessary, puts)
 			 * VLAN device, but we get rid of the reference to
 			 * real_dev here.
 			 */
 			dev_put(real_dev);

 			/* If the group is now empty, kill off the
 			 * group.
 			 */
 			for (i = 0; i < VLAN_VID_MASK; i++)
 				if (vlan_group_get_device(grp, i))
 					break;

 			if (i == VLAN_VID_MASK) {
 				if (real_dev->features & NETIF_F_HW_VLAN_RX)
 					real_dev->vlan_rx_register(real_dev, NULL);

 				hlist_del_rcu(&grp->hlist);

 				/* Free the group, after all cpu's are done. */
 				call_rcu(&grp->rcu, vlan_rcu_free);

 				grp = NULL;
 				ret = 1;
 			}
 		}
 	}

 	return ret;
 }

 int unregister_vlan_device(struct net_device *dev)
 {
 	int ret;

 	ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 				  VLAN_DEV_INFO(dev)->vlan_id);
 	unregister_netdevice(dev);

 	if (ret == 1)
 		ret = 0;
 	return ret;
 }

 /*
  * vlan network devices have devices nesting below it, and are a special
  * "super class" of normal network devices; split their locks off into a
  * separate class since they always nest.
  */
 static struct lock_class_key vlan_netdev_xmit_lock_key;

 static int vlan_dev_init(struct net_device *dev)
 {
 	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

 	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
 	dev->flags  = real_dev->flags & ~IFF_UP;
 	dev->iflink = real_dev->ifindex;
 	dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 					  (1<<__LINK_STATE_DORMANT))) |
 		      (1<<__LINK_STATE_PRESENT);

 	if (is_zero_ether_addr(dev->dev_addr))
 		memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 	if (is_zero_ether_addr(dev->broadcast))
 		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);

 	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 		dev->hard_header     = real_dev->hard_header;
 		dev->hard_header_len = real_dev->hard_header_len;
 		dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 		dev->rebuild_header  = real_dev->rebuild_header;
 	} else {
 		dev->hard_header     = vlan_dev_hard_header;
 		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 		dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 		dev->rebuild_header  = vlan_dev_rebuild_header;
 	}
 	dev->hard_header_parse = real_dev->hard_header_parse;
 	dev->hard_header_cache = NULL;

 	lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 	return 0;
 }

 void vlan_setup(struct net_device *new_dev)
 {
 	SET_MODULE_OWNER(new_dev);

 	ether_setup(new_dev);

 	/* new_dev->ifindex = 0;  it will be set when added to
 	 * the global list.
 	 * iflink is set as well.
 	 */
 	new_dev->get_stats = vlan_dev_get_stats;

 	/* Make this thing known as a VLAN device */
 	new_dev->priv_flags |= IFF_802_1Q_VLAN;

 	/* Set us up to have no queue, as the underlying Hardware device
 	 * can do all the queueing we could want.
 	 */
 	new_dev->tx_queue_len = 0;

 	/* set up method calls */
 	new_dev->change_mtu = vlan_dev_change_mtu;
 	new_dev->init = vlan_dev_init;
 	new_dev->open = vlan_dev_open;
 	new_dev->stop = vlan_dev_stop;
 	new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 	new_dev->change_rx_flags = vlan_change_rx_flags;
 	new_dev->destructor = free_netdev;
 	new_dev->do_ioctl = vlan_dev_ioctl;

 	memset(new_dev->broadcast, 0, ETH_ALEN);
 }

 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 {
 	/* Have to respect userspace enforced dormant state
 	 * of real device, also must allow supplicant running
 	 * on VLAN device
 	 */
 	if (dev->operstate == IF_OPER_DORMANT)
 		netif_dormant_on(vlandev);
 	else
 		netif_dormant_off(vlandev);

 	if (netif_carrier_ok(dev)) {
 		if (!netif_carrier_ok(vlandev))
 			netif_carrier_on(vlandev);
 	} else {
 		if (netif_carrier_ok(vlandev))
 			netif_carrier_off(vlandev);
 	}
 }

 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 {
 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 		printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 			__FUNCTION__, real_dev->name);
 		return -EOPNOTSUPP;
 	}

 	if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 	    !real_dev->vlan_rx_register) {
 		printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 			__FUNCTION__, real_dev->name);
 		return -EOPNOTSUPP;
 	}

 	if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 	    (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 		printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 			__FUNCTION__, real_dev->name);
 		return -EOPNOTSUPP;
 	}

 	/* The real device must be up and operating in order to
 	 * assosciate a VLAN device with it.
 	 */
 	if (!(real_dev->flags & IFF_UP))
 		return -ENETDOWN;

 	if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
 		/* was already registered. */
 		printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 		return -EEXIST;
 	}

 	return 0;
 }

 int register_vlan_dev(struct net_device *dev)
 {
 	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 	struct net_device *real_dev = vlan->real_dev;
 	unsigned short vlan_id = vlan->vlan_id;
 	struct vlan_group *grp, *ngrp = NULL;
 	int err;

 	grp = __vlan_find_group(real_dev->ifindex);
 	if (!grp) {
 		ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 		if (!grp)
 			return -ENOBUFS;
 	}

 	err = register_netdevice(dev);
 	if (err < 0)
 		goto out_free_group;

 	/* Account for reference in struct vlan_dev_info */
 	dev_hold(real_dev);

 	vlan_transfer_operstate(real_dev, dev);
 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */

 	/* So, got the sucker initialized, now lets place
 	 * it into our local structure.
 	 */
 	vlan_group_set_device(grp, vlan_id, dev);
 	if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 		real_dev->vlan_rx_register(real_dev, ngrp);
 	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 		real_dev->vlan_rx_add_vid(real_dev, vlan_id);

 	if (vlan_proc_add_dev(dev) < 0)
 		printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 		       dev->name);
 	return 0;

 out_free_group:
 	if (ngrp)
 		vlan_group_free(ngrp);
 	return err;
 }

 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
  *  Returns 0 if the device was created or a negative error code otherwise.
  */
 static int register_vlan_device(struct net_device *real_dev,
 				unsigned short VLAN_ID)
 {
 	struct net_device *new_dev;
 	char name[IFNAMSIZ];
 	int err;

 #ifdef VLAN_DEBUG
 	printk(VLAN_DBG "%s: if_name -:%s:-	vid: %i\n",
 		__FUNCTION__, eth_IF_name, VLAN_ID);
 #endif

 	if (VLAN_ID >= VLAN_VID_MASK)
 		return -ERANGE;

 	err = vlan_check_real_dev(real_dev, VLAN_ID);
 	if (err < 0)
 		return err;

 	/* Gotta set up the fields for the device. */
 #ifdef VLAN_DEBUG
 	printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 	       vlan_name_type);
 #endif
 	switch (vlan_name_type) {
 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
 		/* name will look like:	 eth1.0005 */
 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 		break;
 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 		/* Put our vlan.VID in the name.
 		 * Name will look like:	 vlan5
 		 */
 		snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 		break;
 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 		/* Put our vlan.VID in the name.
 		 * Name will look like:	 eth0.5
 		 */
 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 		break;
 	case VLAN_NAME_TYPE_PLUS_VID:
 		/* Put our vlan.VID in the name.
 		 * Name will look like:	 vlan0005
 		 */
 	default:
 		snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 	}

 	new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 			       vlan_setup);

 	if (new_dev == NULL)
 		return -ENOBUFS;

 	/* need 4 bytes for extra VLAN header info,
 	 * hope the underlying device can handle it.
 	 */
 	new_dev->mtu = real_dev->mtu;

 #ifdef VLAN_DEBUG
 	printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 	VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 		     new_dev->priv,
 		     sizeof(struct vlan_dev_info));
 #endif

 	VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 	VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 	VLAN_DEV_INFO(new_dev)->dent = NULL;
 	VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;

 	new_dev->rtnl_link_ops = &vlan_link_ops;
 	err = register_vlan_dev(new_dev);
 	if (err < 0)
 		goto out_free_newdev;

 	/* Account for reference in struct vlan_dev_info */
 	dev_hold(real_dev);
 #ifdef VLAN_DEBUG
 	printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 #endif
 	return 0;

 out_free_newdev:
 	free_netdev(new_dev);
 	return err;
 }

 static void vlan_sync_address(struct net_device *dev,
 			      struct net_device *vlandev)
 {
 	struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);

 	/* May be called without an actual change */
 	if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 		return;

 	/* vlan address was different from the old address and is equal to
 	 * the new address */
 	if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 	    !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 		dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);

 	/* vlan address was equal to the old address and is different from
 	 * the new address */
 	if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 	    compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 		dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);

 	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 }

 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 {
 	struct net_device *dev = ptr;
 	struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 	int i, flgs;
 	struct net_device *vlandev;

 	if (!grp)
 		goto out;

 	/* It is OK that we do not hold the group lock right now,
 	 * as we run under the RTNL lock.
 	 */

 	switch (event) {
 	case NETDEV_CHANGE:
 		/* Propagate real device state to vlan devices */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 			vlandev = vlan_group_get_device(grp, i);
 			if (!vlandev)
 				continue;

 			vlan_transfer_operstate(dev, vlandev);
 		}
 		break;

 	case NETDEV_CHANGEADDR:
 		/* Adjust unicast filters on underlying device */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 			vlandev = vlan_group_get_device(grp, i);
 			if (!vlandev)
 				continue;

 			vlan_sync_address(dev, vlandev);
 		}
 		break;

 	case NETDEV_DOWN:
 		/* Put all VLANs for this dev in the down state too.  */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 			vlandev = vlan_group_get_device(grp, i);
 			if (!vlandev)
 				continue;

 			flgs = vlandev->flags;
 			if (!(flgs & IFF_UP))
 				continue;

 			dev_change_flags(vlandev, flgs & ~IFF_UP);
 		}
 		break;

 	case NETDEV_UP:
 		/* Put all VLANs for this dev in the up state too.  */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 			vlandev = vlan_group_get_device(grp, i);
 			if (!vlandev)
 				continue;

 			flgs = vlandev->flags;
 			if (flgs & IFF_UP)
 				continue;

 			dev_change_flags(vlandev, flgs | IFF_UP);
 		}
 		break;

 	case NETDEV_UNREGISTER:
 		/* Delete all VLANs for this dev. */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 			int ret;

 			vlandev = vlan_group_get_device(grp, i);
 			if (!vlandev)
 				continue;

 			ret = unregister_vlan_dev(dev,
 						  VLAN_DEV_INFO(vlandev)->vlan_id);

 			unregister_netdevice(vlandev);

 			/* Group was destroyed? */
 			if (ret == 1)
 				break;
 		}
 		break;
 	}

 out:
 	return NOTIFY_DONE;
 }

 /*
  *	VLAN IOCTL handler.
  *	o execute requested action or pass command to the device driver
  *   arg is really a struct vlan_ioctl_args __user *.
  */
 static int vlan_ioctl_handler(void __user *arg)
 {
 	int err;
 	unsigned short vid = 0;
 	struct vlan_ioctl_args args;
 	struct net_device *dev = NULL;

 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 		return -EFAULT;

 	/* Null terminate this sucker, just in case. */
 	args.device1[23] = 0;
 	args.u.device2[23] = 0;

 #ifdef VLAN_DEBUG
 	printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 #endif

 	rtnl_lock();

 	switch (args.cmd) {
 	case SET_VLAN_INGRESS_PRIORITY_CMD:
 	case SET_VLAN_EGRESS_PRIORITY_CMD:
 	case SET_VLAN_FLAG_CMD:
 	case ADD_VLAN_CMD:
 	case DEL_VLAN_CMD:
 	case GET_VLAN_REALDEV_NAME_CMD:
 	case GET_VLAN_VID_CMD:
 		err = -ENODEV;
 		dev = __dev_get_by_name(args.device1);
 		if (!dev)
 			goto out;

 		err = -EINVAL;
 		if (args.cmd != ADD_VLAN_CMD &&
 		    !(dev->priv_flags & IFF_802_1Q_VLAN))
 			goto out;
 	}

 	switch (args.cmd) {
 	case SET_VLAN_INGRESS_PRIORITY_CMD:
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			break;
 		vlan_dev_set_ingress_priority(dev,
 					      args.u.skb_priority,
 					      args.vlan_qos);
 		break;

 	case SET_VLAN_EGRESS_PRIORITY_CMD:
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			break;
 		err = vlan_dev_set_egress_priority(dev,
 						   args.u.skb_priority,
 						   args.vlan_qos);
 		break;

 	case SET_VLAN_FLAG_CMD:
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			break;
 		err = vlan_dev_set_vlan_flag(dev,
 					     args.u.flag,
 					     args.vlan_qos);
 		break;

 	case SET_VLAN_NAME_TYPE_CMD:
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 		if ((args.u.name_type >= 0) &&
 		    (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 			vlan_name_type = args.u.name_type;
 			err = 0;
 		} else {
 			err = -EINVAL;
 		}
 		break;

 	case ADD_VLAN_CMD:
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			break;
 		err = register_vlan_device(dev, args.u.VID);
 		break;

 	case DEL_VLAN_CMD:
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			break;
 		err = unregister_vlan_device(dev);
 		break;

 	case GET_VLAN_INGRESS_PRIORITY_CMD:
 		/* TODO:  Implement
 		   err = vlan_dev_get_ingress_priority(args);
 		   if (copy_to_user((void*)arg, &args,
 			sizeof(struct vlan_ioctl_args))) {
 			err = -EFAULT;
 		   }
 		*/
 		err = -EINVAL;
 		break;
 	case GET_VLAN_EGRESS_PRIORITY_CMD:
 		/* TODO:  Implement
 		   err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 		   if (copy_to_user((void*)arg, &args,
 			sizeof(struct vlan_ioctl_args))) {
 			err = -EFAULT;
 		   }
 		*/
 		err = -EINVAL;
 		break;
 	case GET_VLAN_REALDEV_NAME_CMD:
 		err = 0;
 		vlan_dev_get_realdev_name(dev, args.u.device2);
 		if (copy_to_user(arg, &args,
 				 sizeof(struct vlan_ioctl_args))) {
 			err = -EFAULT;
 		}
 		break;

 	case GET_VLAN_VID_CMD:
 		err = 0;
 		vlan_dev_get_vid(dev, &vid);
 		args.u.VID = vid;
 		if (copy_to_user(arg, &args,
 				 sizeof(struct vlan_ioctl_args))) {
 		      err = -EFAULT;
 		}
 		break;

 	default:
 		/* pass on to underlying device instead?? */
 		printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 			__FUNCTION__, args.cmd);
 		err = -EINVAL;
 		break;
 	}
 out:
 	rtnl_unlock();
 	return err;
 }

 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_VERSION);
	/*
	* INET 802.1Q VLAN
	* Ethernet-type device handling.
	*
	* Authors: Ben Greear <greearb@candelatech.com>
	* Please send support related email to: vlan@scry.wanfear.com
	* VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
	*
	* Fixes:
	* Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
	* Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
	* Correct all the locking - David S. Miller <davem@redhat.com>;
	* Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#include <asm/uaccess.h> /* for copy_from_user */
	#include <linux/capability.h>
	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/skbuff.h>
	#include <net/datalink.h>
	#include <linux/mm.h>
	#include <linux/in.h>
	#include <linux/init.h>
	#include <net/p8022.h>
	#include <net/arp.h>
	#include <linux/rtnetlink.h>
	#include <linux/notifier.h>

	#include <linux/if_vlan.h>
	#include "vlan.h"
	#include "vlanproc.h"

	#define DRV_VERSION "1.8"

	/* Global VLAN variables */

	/* Our listing of VLAN group(s) */
	static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
	#define vlan_grp_hashfn(IDX) ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)

	static char vlan_fullname[] = "802.1Q VLAN Support";
	static char vlan_version[] = DRV_VERSION;
	static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
	static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";

	static int vlan_device_event(struct notifier_block , unsigned long, void );
	static int vlan_ioctl_handler(void __user *);
	static int unregister_vlan_dev(struct net_device *, unsigned short );

	static struct notifier_block vlan_notifier_block = {
	.notifier_call = vlan_device_event,
	};

	/* These may be changed at run-time through IOCTLs */

	/* Determines interface naming scheme. */
	unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;

	static struct packet_type vlan_packet_type = {
	.type = __constant_htons(ETH_P_8021Q),
	.func = vlan_skb_recv, /* VLAN receive method */
	};

	/* End of global variables definitions. */

	/*
	* Function vlan_proto_init (pro)
	*
	* Initialize VLAN protocol layer,
	*
	*/
	static int __init vlan_proto_init(void)
	{
	int err;

	printk(VLAN_INF "%s v%s %s\n",
	vlan_fullname, vlan_version, vlan_copyright);
	printk(VLAN_INF "All bugs added by %s\n",
	vlan_buggyright);

	/* proc file system initialization */
	err = vlan_proc_init();
	if (err < 0) {
	printk(KERN_ERR
	"%s %s: can't create entry in proc filesystem!\n",
	__FUNCTION__, VLAN_NAME);
	return err;
	}

	dev_add_pack(&vlan_packet_type);

	/* Register us to receive netdevice events */
	err = register_netdevice_notifier(&vlan_notifier_block);
	if (err < 0)
	goto err1;

	err = vlan_netlink_init();
	if (err < 0)
	goto err2;

	vlan_ioctl_set(vlan_ioctl_handler);
	return 0;

	err2:
	unregister_netdevice_notifier(&vlan_notifier_block);
	err1:
	vlan_proc_cleanup();
	dev_remove_pack(&vlan_packet_type);
	return err;
	}

	/*
	* Module 'remove' entry point.
	* o delete /proc/net/router directory and static entries.
	*/
	static void __exit vlan_cleanup_module(void)
	{
	int i;

	vlan_netlink_fini();
	vlan_ioctl_set(NULL);

	/* Un-register us from receiving netdevice events */
	unregister_netdevice_notifier(&vlan_notifier_block);

	dev_remove_pack(&vlan_packet_type);

	/* This table must be empty if there are no module
	* references left.
	*/
	for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
	BUG_ON(!hlist_empty(&vlan_group_hash[i]));
	}
	vlan_proc_cleanup();

	synchronize_net();
	}

	module_init(vlan_proto_init);
	module_exit(vlan_cleanup_module);

	/* Must be invoked with RCU read lock (no preempt) */
	static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
	{
	struct vlan_group *grp;
	struct hlist_node *n;
	int hash = vlan_grp_hashfn(real_dev_ifindex);

	hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
	if (grp->real_dev_ifindex == real_dev_ifindex)
	return grp;
	}

	return NULL;
	}

	/* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
	*
	* Must be invoked with RCU read lock (no preempt)
	*/
	struct net_device __find_vlan_dev(struct net_device real_dev,
	unsigned short VID)
	{
	struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);

	if (grp)
	return vlan_group_get_device(grp, VID);

	return NULL;
	}

	static void vlan_group_free(struct vlan_group *grp)
	{
	int i;

	for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
	kfree(grp->vlan_devices_arrays[i]);
	kfree(grp);
	}

	static struct vlan_group *vlan_group_alloc(int ifindex)
	{
	struct vlan_group *grp;
	unsigned int size;
	unsigned int i;

	grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
	if (!grp)
	return NULL;

	size = sizeof(struct net_device ) VLAN_GROUP_ARRAY_PART_LEN;

	for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
	grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
	if (!grp->vlan_devices_arrays[i])
	goto err;
	}

	grp->real_dev_ifindex = ifindex;
	hlist_add_head_rcu(&grp->hlist,
	&vlan_group_hash[vlan_grp_hashfn(ifindex)]);
	return grp;

	err:
	vlan_group_free(grp);
	return NULL;
	}

	static void vlan_rcu_free(struct rcu_head *rcu)
	{
	vlan_group_free(container_of(rcu, struct vlan_group, rcu));
	}


	/* This returns 0 if everything went fine.
	* It will return 1 if the group was killed as a result.
	* A negative return indicates failure.
	*
	* The RTNL lock must be held.
	*/
	static int unregister_vlan_dev(struct net_device *real_dev,
	unsigned short vlan_id)
	{
	struct net_device *dev = NULL;
	int real_dev_ifindex = real_dev->ifindex;
	struct vlan_group *grp;
	int i, ret;

	#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
	#endif

	/* sanity check */
	if (vlan_id >= VLAN_VID_MASK)
	return -EINVAL;

	ASSERT_RTNL();
	grp = __vlan_find_group(real_dev_ifindex);

	ret = 0;

	if (grp) {
	dev = vlan_group_get_device(grp, vlan_id);
	if (dev) {
	/* Remove proc entry */
	vlan_proc_rem_dev(dev);

	/* Take it out of our own structures, but be sure to
	* interlock with HW accelerating devices or SW vlan
	* input packet processing.
	*/
	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
	real_dev->vlan_rx_kill_vid(real_dev, vlan_id);

	vlan_group_set_device(grp, vlan_id, NULL);
	synchronize_net();


	/* Caller unregisters (and if necessary, puts)
	* VLAN device, but we get rid of the reference to
	* real_dev here.
	*/
	dev_put(real_dev);

	/* If the group is now empty, kill off the
	* group.
	*/
	for (i = 0; i < VLAN_VID_MASK; i++)
	if (vlan_group_get_device(grp, i))
	break;

	if (i == VLAN_VID_MASK) {
	if (real_dev->features & NETIF_F_HW_VLAN_RX)
	real_dev->vlan_rx_register(real_dev, NULL);

	hlist_del_rcu(&grp->hlist);

	/* Free the group, after all cpu's are done. */
	call_rcu(&grp->rcu, vlan_rcu_free);

	grp = NULL;
	ret = 1;
	}
	}
	}

	return ret;
	}

	int unregister_vlan_device(struct net_device *dev)
	{
	int ret;

	ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
	VLAN_DEV_INFO(dev)->vlan_id);
	unregister_netdevice(dev);

	if (ret == 1)
	ret = 0;
	return ret;
	}

	/*
	* vlan network devices have devices nesting below it, and are a special
	* "super class" of normal network devices; split their locks off into a
	* separate class since they always nest.
	*/
	static struct lock_class_key vlan_netdev_xmit_lock_key;

	static int vlan_dev_init(struct net_device *dev)
	{
	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

	/* IFF_BROADCAST\|IFF_MULTICAST; ??? */
	dev->flags = real_dev->flags & ~IFF_UP;
	dev->iflink = real_dev->ifindex;
	dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) \|
	(1<<__LINK_STATE_DORMANT))) \|
	(1<<__LINK_STATE_PRESENT);

	if (is_zero_ether_addr(dev->dev_addr))
	memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
	if (is_zero_ether_addr(dev->broadcast))
	memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);

	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
	dev->hard_header = real_dev->hard_header;
	dev->hard_header_len = real_dev->hard_header_len;
	dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
	dev->rebuild_header = real_dev->rebuild_header;
	} else {
	dev->hard_header = vlan_dev_hard_header;
	dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
	dev->hard_start_xmit = vlan_dev_hard_start_xmit;
	dev->rebuild_header = vlan_dev_rebuild_header;
	}
	dev->hard_header_parse = real_dev->hard_header_parse;
	dev->hard_header_cache = NULL;

	lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
	return 0;
	}

	void vlan_setup(struct net_device *new_dev)
	{
	SET_MODULE_OWNER(new_dev);

	ether_setup(new_dev);

	/* new_dev->ifindex = 0; it will be set when added to
	* the global list.
	* iflink is set as well.
	*/
	new_dev->get_stats = vlan_dev_get_stats;

	/* Make this thing known as a VLAN device */
	new_dev->priv_flags \|= IFF_802_1Q_VLAN;

	/* Set us up to have no queue, as the underlying Hardware device
	* can do all the queueing we could want.
	*/
	new_dev->tx_queue_len = 0;

	/* set up method calls */
	new_dev->change_mtu = vlan_dev_change_mtu;
	new_dev->init = vlan_dev_init;
	new_dev->open = vlan_dev_open;
	new_dev->stop = vlan_dev_stop;
	new_dev->set_multicast_list = vlan_dev_set_multicast_list;
	new_dev->change_rx_flags = vlan_change_rx_flags;
	new_dev->destructor = free_netdev;
	new_dev->do_ioctl = vlan_dev_ioctl;

	memset(new_dev->broadcast, 0, ETH_ALEN);
	}

	static void vlan_transfer_operstate(const struct net_device dev, struct net_device vlandev)
	{
	/* Have to respect userspace enforced dormant state
	* of real device, also must allow supplicant running
	* on VLAN device
	*/
	if (dev->operstate == IF_OPER_DORMANT)
	netif_dormant_on(vlandev);
	else
	netif_dormant_off(vlandev);

	if (netif_carrier_ok(dev)) {
	if (!netif_carrier_ok(vlandev))
	netif_carrier_on(vlandev);
	} else {
	if (netif_carrier_ok(vlandev))
	netif_carrier_off(vlandev);
	}
	}

	int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
	{
	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
	printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
	__FUNCTION__, real_dev->name);
	return -EOPNOTSUPP;
	}

	if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
	!real_dev->vlan_rx_register) {
	printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
	__FUNCTION__, real_dev->name);
	return -EOPNOTSUPP;
	}

	if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
	(!real_dev->vlan_rx_add_vid \|\| !real_dev->vlan_rx_kill_vid)) {
	printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
	__FUNCTION__, real_dev->name);
	return -EOPNOTSUPP;
	}

	/* The real device must be up and operating in order to
	* assosciate a VLAN device with it.
	*/
	if (!(real_dev->flags & IFF_UP))
	return -ENETDOWN;

	if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
	/* was already registered. */
	printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
	return -EEXIST;
	}

	return 0;
	}

	int register_vlan_dev(struct net_device *dev)
	{
	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
	struct net_device *real_dev = vlan->real_dev;
	unsigned short vlan_id = vlan->vlan_id;
	struct vlan_group grp, ngrp = NULL;
	int err;

	grp = __vlan_find_group(real_dev->ifindex);
	if (!grp) {
	ngrp = grp = vlan_group_alloc(real_dev->ifindex);
	if (!grp)
	return -ENOBUFS;
	}

	err = register_netdevice(dev);
	if (err < 0)
	goto out_free_group;

	/* Account for reference in struct vlan_dev_info */
	dev_hold(real_dev);

	vlan_transfer_operstate(real_dev, dev);
	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */

	/* So, got the sucker initialized, now lets place
	* it into our local structure.
	*/
	vlan_group_set_device(grp, vlan_id, dev);
	if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
	real_dev->vlan_rx_register(real_dev, ngrp);
	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
	real_dev->vlan_rx_add_vid(real_dev, vlan_id);

	if (vlan_proc_add_dev(dev) < 0)
	printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
	dev->name);
	return 0;

	out_free_group:
	if (ngrp)
	vlan_group_free(ngrp);
	return err;
	}

	/* Attach a VLAN device to a mac address (ie Ethernet Card).
	* Returns 0 if the device was created or a negative error code otherwise.
	*/
	static int register_vlan_device(struct net_device *real_dev,
	unsigned short VLAN_ID)
	{
	struct net_device *new_dev;
	char name[IFNAMSIZ];
	int err;

	#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: if_name -:%s:- vid: %i\n",
	__FUNCTION__, eth_IF_name, VLAN_ID);
	#endif

	if (VLAN_ID >= VLAN_VID_MASK)
	return -ERANGE;

	err = vlan_check_real_dev(real_dev, VLAN_ID);
	if (err < 0)
	return err;

	/* Gotta set up the fields for the device. */
	#ifdef VLAN_DEBUG
	printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
	vlan_name_type);
	#endif
	switch (vlan_name_type) {
	case VLAN_NAME_TYPE_RAW_PLUS_VID:
	/* name will look like: eth1.0005 */
	snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
	break;
	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
	/* Put our vlan.VID in the name.
	* Name will look like: vlan5
	*/
	snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
	break;
	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
	/* Put our vlan.VID in the name.
	* Name will look like: eth0.5
	*/
	snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
	break;
	case VLAN_NAME_TYPE_PLUS_VID:
	/* Put our vlan.VID in the name.
	* Name will look like: vlan0005
	*/
	default:
	snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
	}

	new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
	vlan_setup);

	if (new_dev == NULL)
	return -ENOBUFS;

	/* need 4 bytes for extra VLAN header info,
	* hope the underlying device can handle it.
	*/
	new_dev->mtu = real_dev->mtu;

	#ifdef VLAN_DEBUG
	printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
	VLAN_MEM_DBG("new_dev->priv malloc, addr: %p size: %i\n",
	new_dev->priv,
	sizeof(struct vlan_dev_info));
	#endif

	VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
	VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
	VLAN_DEV_INFO(new_dev)->dent = NULL;
	VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;

	new_dev->rtnl_link_ops = &vlan_link_ops;
	err = register_vlan_dev(new_dev);
	if (err < 0)
	goto out_free_newdev;

	/* Account for reference in struct vlan_dev_info */
	dev_hold(real_dev);
	#ifdef VLAN_DEBUG
	printk(VLAN_DBG "Allocated new device successfully, returning.\n");
	#endif
	return 0;

	out_free_newdev:
	free_netdev(new_dev);
	return err;
	}

	static void vlan_sync_address(struct net_device *dev,
	struct net_device *vlandev)
	{
	struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);

	/* May be called without an actual change */
	if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
	return;

	/* vlan address was different from the old address and is equal to
	* the new address */
	if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
	!compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
	dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);

	/* vlan address was equal to the old address and is different from
	* the new address */
	if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
	compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
	dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);

	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
	}

	static int vlan_device_event(struct notifier_block unused, unsigned long event, void ptr)
	{
	struct net_device *dev = ptr;
	struct vlan_group *grp = __vlan_find_group(dev->ifindex);
	int i, flgs;
	struct net_device *vlandev;

	if (!grp)
	goto out;

	/* It is OK that we do not hold the group lock right now,
	* as we run under the RTNL lock.
	*/

	switch (event) {
	case NETDEV_CHANGE:
	/* Propagate real device state to vlan devices */
	for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
	vlandev = vlan_group_get_device(grp, i);
	if (!vlandev)
	continue;

	vlan_transfer_operstate(dev, vlandev);
	}
	break;

	case NETDEV_CHANGEADDR:
	/* Adjust unicast filters on underlying device */
	for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
	vlandev = vlan_group_get_device(grp, i);
	if (!vlandev)
	continue;

	vlan_sync_address(dev, vlandev);
	}
	break;

	case NETDEV_DOWN:
	/* Put all VLANs for this dev in the down state too. */
	for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
	vlandev = vlan_group_get_device(grp, i);
	if (!vlandev)
	continue;

	flgs = vlandev->flags;
	if (!(flgs & IFF_UP))
	continue;

	dev_change_flags(vlandev, flgs & ~IFF_UP);
	}
	break;

	case NETDEV_UP:
	/* Put all VLANs for this dev in the up state too. */
	for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
	vlandev = vlan_group_get_device(grp, i);
	if (!vlandev)
	continue;

	flgs = vlandev->flags;
	if (flgs & IFF_UP)
	continue;

	dev_change_flags(vlandev, flgs \| IFF_UP);
	}
	break;

	case NETDEV_UNREGISTER:
	/* Delete all VLANs for this dev. */
	for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
	int ret;

	vlandev = vlan_group_get_device(grp, i);
	if (!vlandev)
	continue;

	ret = unregister_vlan_dev(dev,
	VLAN_DEV_INFO(vlandev)->vlan_id);

	unregister_netdevice(vlandev);

	/* Group was destroyed? */
	if (ret == 1)
	break;
	}
	break;
	}

	out:
	return NOTIFY_DONE;
	}

	/*
	* VLAN IOCTL handler.
	* o execute requested action or pass command to the device driver
	* arg is really a struct vlan_ioctl_args __user *.
	*/
	static int vlan_ioctl_handler(void __user *arg)
	{
	int err;
	unsigned short vid = 0;
	struct vlan_ioctl_args args;
	struct net_device *dev = NULL;

	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
	return -EFAULT;

	/* Null terminate this sucker, just in case. */
	args.device1[23] = 0;
	args.u.device2[23] = 0;

	#ifdef VLAN_DEBUG
	printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
	#endif

	rtnl_lock();

	switch (args.cmd) {
	case SET_VLAN_INGRESS_PRIORITY_CMD:
	case SET_VLAN_EGRESS_PRIORITY_CMD:
	case SET_VLAN_FLAG_CMD:
	case ADD_VLAN_CMD:
	case DEL_VLAN_CMD:
	case GET_VLAN_REALDEV_NAME_CMD:
	case GET_VLAN_VID_CMD:
	err = -ENODEV;
	dev = __dev_get_by_name(args.device1);
	if (!dev)
	goto out;

	err = -EINVAL;
	if (args.cmd != ADD_VLAN_CMD &&
	!(dev->priv_flags & IFF_802_1Q_VLAN))
	goto out;
	}

	switch (args.cmd) {
	case SET_VLAN_INGRESS_PRIORITY_CMD:
	err = -EPERM;
	if (!capable(CAP_NET_ADMIN))
	break;
	vlan_dev_set_ingress_priority(dev,
	args.u.skb_priority,
	args.vlan_qos);
	break;

	case SET_VLAN_EGRESS_PRIORITY_CMD:
	err = -EPERM;
	if (!capable(CAP_NET_ADMIN))
	break;
	err = vlan_dev_set_egress_priority(dev,
	args.u.skb_priority,
	args.vlan_qos);
	break;

	case SET_VLAN_FLAG_CMD:
	err = -EPERM;
	if (!capable(CAP_NET_ADMIN))
	break;
	err = vlan_dev_set_vlan_flag(dev,
	args.u.flag,
	args.vlan_qos);
	break;

	case SET_VLAN_NAME_TYPE_CMD:
	err = -EPERM;
	if (!capable(CAP_NET_ADMIN))
	return -EPERM;
	if ((args.u.name_type >= 0) &&
	(args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
	vlan_name_type = args.u.name_type;
	err = 0;
	} else {
	err = -EINVAL;
	}
	break;

	case ADD_VLAN_CMD:
	err = -EPERM;
	if (!capable(CAP_NET_ADMIN))
	break;
	err = register_vlan_device(dev, args.u.VID);
	break;

	case DEL_VLAN_CMD:
	err = -EPERM;
	if (!capable(CAP_NET_ADMIN))
	break;
	err = unregister_vlan_device(dev);
	break;

	case GET_VLAN_INGRESS_PRIORITY_CMD:
	/* TODO: Implement
	err = vlan_dev_get_ingress_priority(args);
	if (copy_to_user((void*)arg, &args,
	sizeof(struct vlan_ioctl_args))) {
	err = -EFAULT;
	}
	*/
	err = -EINVAL;
	break;
	case GET_VLAN_EGRESS_PRIORITY_CMD:
	/* TODO: Implement
	err = vlan_dev_get_egress_priority(args.device1, &(args.args);
	if (copy_to_user((void*)arg, &args,
	sizeof(struct vlan_ioctl_args))) {
	err = -EFAULT;
	}
	*/
	err = -EINVAL;
	break;
	case GET_VLAN_REALDEV_NAME_CMD:
	err = 0;
	vlan_dev_get_realdev_name(dev, args.u.device2);
	if (copy_to_user(arg, &args,
	sizeof(struct vlan_ioctl_args))) {
	err = -EFAULT;
	}
	break;

	case GET_VLAN_VID_CMD:
	err = 0;
	vlan_dev_get_vid(dev, &vid);
	args.u.VID = vid;
	if (copy_to_user(arg, &args,
	sizeof(struct vlan_ioctl_args))) {
	err = -EFAULT;
	}
	break;

	default:
	/* pass on to underlying device instead?? */
	printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
	__FUNCTION__, args.cmd);
	err = -EINVAL;
	break;
	}
	out:
	rtnl_unlock();
	return err;
	}

	MODULE_LICENSE("GPL");
	MODULE_VERSION(DRV_VERSION);