include/linux/if_vlan.h - kernel/msm-4.9 - Gitiles

 /*
  * VLAN		An implementation of 802.1Q VLAN tagging.
  *
  * Authors:	Ben Greear <greearb@candelatech.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.
  *
  */

 #ifndef _LINUX_IF_VLAN_H_
 #define _LINUX_IF_VLAN_H_

 #ifdef __KERNEL__

 /* externally defined structs */
 struct hlist_node;

 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>

 #define VLAN_HLEN	4		/* The additional bytes (on top of the Ethernet header)
 					 * that VLAN requires.
 					 */
 #define VLAN_ETH_ALEN	6		/* Octets in one ethernet addr	 */
 #define VLAN_ETH_HLEN	18		/* Total octets in header.	 */
 #define VLAN_ETH_ZLEN	64		/* Min. octets in frame sans FCS */

 /*
  * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
  */
 #define VLAN_ETH_DATA_LEN	1500	/* Max. octets in payload	 */
 #define VLAN_ETH_FRAME_LEN	1518	/* Max. octets in frame sans FCS */

 /*
  * 	struct vlan_hdr - vlan header
  * 	@h_vlan_TCI: priority and VLAN ID
  *	@h_vlan_encapsulated_proto: packet type ID or len
  */
 struct vlan_hdr {
 	__be16	h_vlan_TCI;
 	__be16	h_vlan_encapsulated_proto;
 };

 /**
  *	struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
  *	@h_dest: destination ethernet address
  *	@h_source: source ethernet address
  *	@h_vlan_proto: ethernet protocol (always 0x8100)
  *	@h_vlan_TCI: priority and VLAN ID
  *	@h_vlan_encapsulated_proto: packet type ID or len
  */
 struct vlan_ethhdr {
 	unsigned char	h_dest[ETH_ALEN];
 	unsigned char	h_source[ETH_ALEN];
 	__be16		h_vlan_proto;
 	__be16		h_vlan_TCI;
 	__be16		h_vlan_encapsulated_proto;
 };

 #include <linux/skbuff.h>

 static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
 {
 	return (struct vlan_ethhdr *)skb_mac_header(skb);
 }

 #define VLAN_VID_MASK	0xfff

 /* found in socket.c */
 extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));

 /* if this changes, algorithm will have to be reworked because this
  * depends on completely exhausting the VLAN identifier space.  Thus
  * it gives constant time look-up, but in many cases it wastes memory.
  */
 #define VLAN_GROUP_ARRAY_LEN          4096
 #define VLAN_GROUP_ARRAY_SPLIT_PARTS  8
 #define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)

 struct vlan_group {
 	int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
 	unsigned int		nr_vlans;
 	struct hlist_node	hlist;	/* linked list */
 	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
 	struct rcu_head		rcu;
 };

 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
 						       unsigned int vlan_id)
 {
 	struct net_device **array;
 	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 	return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
 }

 static inline void vlan_group_set_device(struct vlan_group *vg,
 					 unsigned int vlan_id,
 					 struct net_device *dev)
 {
 	struct net_device **array;
 	if (!vg)
 		return;
 	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
 }

 struct vlan_priority_tci_mapping {
 	u32 priority;
 	unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
 				  * at provisioning time.
 				  * ((skb->priority << 13) & 0xE000)
 				  */
 	struct vlan_priority_tci_mapping *next;
 };

 /* Holds information that makes sense if this device is a VLAN device. */
 struct vlan_dev_info {
 	/** This will be the mapping that correlates skb->priority to
 	 * 3 bits of VLAN QOS tags...
 	 */
 	unsigned int nr_ingress_mappings;
 	u32 ingress_priority_map[8];

 	unsigned int nr_egress_mappings;
 	struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */

 	unsigned short vlan_id;        /*  The VLAN Identifier for this interface. */
 	unsigned short flags;          /* (1 << 0) re_order_header   This option will cause the
                                         *   VLAN code to move around the ethernet header on
                                         *   ingress to make the skb look **exactly** like it
                                         *   came in from an ethernet port.  This destroys some of
                                         *   the VLAN information in the skb, but it fixes programs
                                         *   like DHCP that use packet-filtering and don't understand
                                         *   802.1Q
                                         */
 	struct net_device *real_dev;    /* the underlying device/interface */
 	unsigned char real_dev_addr[ETH_ALEN];
 	struct proc_dir_entry *dent;    /* Holds the proc data */
 	unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
 	unsigned long cnt_encap_on_xmit;      /* How many times did we have to encapsulate the skb on TX. */
 };

 static inline struct vlan_dev_info *vlan_dev_info(const struct net_device *dev)
 {
 	return netdev_priv(dev);
 }

 /* inline functions */
 static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
 					      unsigned short vlan_tag)
 {
 	struct vlan_dev_info *vip = vlan_dev_info(dev);

 	return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
 }

 /* VLAN tx hw acceleration helpers. */
 struct vlan_skb_tx_cookie {
 	u32	magic;
 	u32	vlan_tag;
 };

 #define VLAN_TX_COOKIE_MAGIC	0x564c414e	/* "VLAN" in ascii. */
 #define VLAN_TX_SKB_CB(__skb)	((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
 #define vlan_tx_tag_present(__skb) \
 	(VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
 #define vlan_tx_tag_get(__skb)	(VLAN_TX_SKB_CB(__skb)->vlan_tag)

 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
 static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
 				    struct vlan_group *grp,
 				    unsigned short vlan_tag, int polling)
 {
 	struct net_device_stats *stats;

 	if (skb_bond_should_drop(skb)) {
 		dev_kfree_skb_any(skb);
 		return NET_RX_DROP;
 	}

 	skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
 	if (skb->dev == NULL) {
 		dev_kfree_skb_any(skb);

 		/* Not NET_RX_DROP, this is not being dropped
 		 * due to congestion.
 		 */
 		return 0;
 	}

 	skb->dev->last_rx = jiffies;

 	stats = &skb->dev->stats;
 	stats->rx_packets++;
 	stats->rx_bytes += skb->len;

 	skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
 	switch (skb->pkt_type) {
 	case PACKET_BROADCAST:
 		break;

 	case PACKET_MULTICAST:
 		stats->multicast++;
 		break;

 	case PACKET_OTHERHOST:
 		/* Our lower layer thinks this is not local, let's make sure.
 		 * This allows the VLAN to have a different MAC than the underlying
 		 * device, and still route correctly.
 		 */
 		if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 				       	skb->dev->dev_addr))
 			skb->pkt_type = PACKET_HOST;
 		break;
 	};

 	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
 }

 static inline int vlan_hwaccel_rx(struct sk_buff *skb,
 				  struct vlan_group *grp,
 				  unsigned short vlan_tag)
 {
 	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
 }

 static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
 					   struct vlan_group *grp,
 					   unsigned short vlan_tag)
 {
 	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
 }

 /**
  * __vlan_put_tag - regular VLAN tag inserting
  * @skb: skbuff to tag
  * @tag: VLAN tag to insert
  *
  * Inserts the VLAN tag into @skb as part of the payload
  * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
  *
  * Following the skb_unshare() example, in case of error, the calling function
  * doesn't have to worry about freeing the original skb.
  */
 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag)
 {
 	struct vlan_ethhdr *veth;

 	if (skb_headroom(skb) < VLAN_HLEN) {
 		struct sk_buff *sk_tmp = skb;
 		skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
 		kfree_skb(sk_tmp);
 		if (!skb) {
 			printk(KERN_ERR "vlan: failed to realloc headroom\n");
 			return NULL;
 		}
 	} else {
 		skb = skb_unshare(skb, GFP_ATOMIC);
 		if (!skb) {
 			printk(KERN_ERR "vlan: failed to unshare skbuff\n");
 			return NULL;
 		}
 	}

 	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);

 	/* Move the mac addresses to the beginning of the new header. */
 	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);

 	/* first, the ethernet type */
 	veth->h_vlan_proto = htons(ETH_P_8021Q);

 	/* now, the tag */
 	veth->h_vlan_TCI = htons(tag);

 	skb->protocol = htons(ETH_P_8021Q);
 	skb->mac_header -= VLAN_HLEN;
 	skb->network_header -= VLAN_HLEN;

 	return skb;
 }

 /**
  * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
  * @skb: skbuff to tag
  * @tag: VLAN tag to insert
  *
  * Puts the VLAN tag in @skb->cb[] and lets the device do the rest
  */
 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag)
 {
 	struct vlan_skb_tx_cookie *cookie;

 	cookie = VLAN_TX_SKB_CB(skb);
 	cookie->magic = VLAN_TX_COOKIE_MAGIC;
 	cookie->vlan_tag = tag;

 	return skb;
 }

 #define HAVE_VLAN_PUT_TAG

 /**
  * vlan_put_tag - inserts VLAN tag according to device features
  * @skb: skbuff to tag
  * @tag: VLAN tag to insert
  *
  * Assumes skb->dev is the target that will xmit this frame.
  * Returns a VLAN tagged skb.
  */
 static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, unsigned short tag)
 {
 	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
 		return __vlan_hwaccel_put_tag(skb, tag);
 	} else {
 		return __vlan_put_tag(skb, tag);
 	}
 }

 /**
  * __vlan_get_tag - get the VLAN ID that is part of the payload
  * @skb: skbuff to query
  * @tag: buffer to store vlaue
  *
  * Returns error if the skb is not of VLAN type
  */
 static inline int __vlan_get_tag(struct sk_buff *skb, unsigned short *tag)
 {
 	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;

 	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
 		return -EINVAL;
 	}

 	*tag = ntohs(veth->h_vlan_TCI);

 	return 0;
 }

 /**
  * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
  * @skb: skbuff to query
  * @tag: buffer to store vlaue
  *
  * Returns error if @skb->cb[] is not set correctly
  */
 static inline int __vlan_hwaccel_get_tag(struct sk_buff *skb, unsigned short *tag)
 {
 	struct vlan_skb_tx_cookie *cookie;

 	cookie = VLAN_TX_SKB_CB(skb);
 	if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
 		*tag = cookie->vlan_tag;
 		return 0;
 	} else {
 		*tag = 0;
 		return -EINVAL;
 	}
 }

 #define HAVE_VLAN_GET_TAG

 /**
  * vlan_get_tag - get the VLAN ID from the skb
  * @skb: skbuff to query
  * @tag: buffer to store vlaue
  *
  * Returns error if the skb is not VLAN tagged
  */
 static inline int vlan_get_tag(struct sk_buff *skb, unsigned short *tag)
 {
 	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
 		return __vlan_hwaccel_get_tag(skb, tag);
 	} else {
 		return __vlan_get_tag(skb, tag);
 	}
 }

 #endif /* __KERNEL__ */

 /* VLAN IOCTLs are found in sockios.h */

 /* Passed in vlan_ioctl_args structure to determine behaviour. */
 enum vlan_ioctl_cmds {
 	ADD_VLAN_CMD,
 	DEL_VLAN_CMD,
 	SET_VLAN_INGRESS_PRIORITY_CMD,
 	SET_VLAN_EGRESS_PRIORITY_CMD,
 	GET_VLAN_INGRESS_PRIORITY_CMD,
 	GET_VLAN_EGRESS_PRIORITY_CMD,
 	SET_VLAN_NAME_TYPE_CMD,
 	SET_VLAN_FLAG_CMD,
 	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
 	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
 };

 enum vlan_flags {
 	VLAN_FLAG_REORDER_HDR	= 0x1,
 };

 enum vlan_name_types {
 	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like:  vlan0005 */
 	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like:  eth1.0005 */
 	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like:  vlan5 */
 	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like:  eth0.5 */
 	VLAN_NAME_TYPE_HIGHEST
 };

 struct vlan_ioctl_args {
 	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
 	char device1[24];

         union {
 		char device2[24];
 		int VID;
 		unsigned int skb_priority;
 		unsigned int name_type;
 		unsigned int bind_type;
 		unsigned int flag; /* Matches vlan_dev_info flags */
         } u;

 	short vlan_qos;
 };

 #endif /* !(_LINUX_IF_VLAN_H_) */
	/*
	* VLAN An implementation of 802.1Q VLAN tagging.
	*
	* Authors: Ben Greear <greearb@candelatech.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.
	*
	*/

	#ifndef _LINUX_IF_VLAN_H_
	#define _LINUX_IF_VLAN_H_

	#ifdef __KERNEL__

	/* externally defined structs */
	struct hlist_node;

	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>

	#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
	* that VLAN requires.
	*/
	#define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
	#define VLAN_ETH_HLEN 18 /* Total octets in header. */
	#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */

	/*
	* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
	*/
	#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
	#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */

	/*
	* struct vlan_hdr - vlan header
	* @h_vlan_TCI: priority and VLAN ID
	* @h_vlan_encapsulated_proto: packet type ID or len
	*/
	struct vlan_hdr {
	__be16 h_vlan_TCI;
	__be16 h_vlan_encapsulated_proto;
	};

	/**
	* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
	* @h_dest: destination ethernet address
	* @h_source: source ethernet address
	* @h_vlan_proto: ethernet protocol (always 0x8100)
	* @h_vlan_TCI: priority and VLAN ID
	* @h_vlan_encapsulated_proto: packet type ID or len
	*/
	struct vlan_ethhdr {
	unsigned char h_dest[ETH_ALEN];
	unsigned char h_source[ETH_ALEN];
	__be16 h_vlan_proto;
	__be16 h_vlan_TCI;
	__be16 h_vlan_encapsulated_proto;
	};

	#include <linux/skbuff.h>

	static inline struct vlan_ethhdr vlan_eth_hdr(const struct sk_buff skb)
	{
	return (struct vlan_ethhdr *)skb_mac_header(skb);
	}

	#define VLAN_VID_MASK 0xfff

	/* found in socket.c */
	extern void vlan_ioctl_set(int (hook)(struct net , void __user *));

	/* if this changes, algorithm will have to be reworked because this
	* depends on completely exhausting the VLAN identifier space. Thus
	* it gives constant time look-up, but in many cases it wastes memory.
	*/
	#define VLAN_GROUP_ARRAY_LEN 4096
	#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
	#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)

	struct vlan_group {
	int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
	unsigned int nr_vlans;
	struct hlist_node hlist; /* linked list */
	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
	struct rcu_head rcu;
	};

	static inline struct net_device vlan_group_get_device(struct vlan_group vg,
	unsigned int vlan_id)
	{
	struct net_device **array;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
	}

	static inline void vlan_group_set_device(struct vlan_group *vg,
	unsigned int vlan_id,
	struct net_device *dev)
	{
	struct net_device **array;
	if (!vg)
	return;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
	}

	struct vlan_priority_tci_mapping {
	u32 priority;
	unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
	* at provisioning time.
	* ((skb->priority << 13) & 0xE000)
	*/
	struct vlan_priority_tci_mapping *next;
	};

	/* Holds information that makes sense if this device is a VLAN device. */
	struct vlan_dev_info {
	/** This will be the mapping that correlates skb->priority to
	* 3 bits of VLAN QOS tags...
	*/
	unsigned int nr_ingress_mappings;
	u32 ingress_priority_map[8];

	unsigned int nr_egress_mappings;
	struct vlan_priority_tci_mapping egress_priority_map[16]; / hash table */

	unsigned short vlan_id; /* The VLAN Identifier for this interface. */
	unsigned short flags; /* (1 << 0) re_order_header This option will cause the
	* VLAN code to move around the ethernet header on
	* ingress to make the skb look exactly like it
	* came in from an ethernet port. This destroys some of
	* the VLAN information in the skb, but it fixes programs
	* like DHCP that use packet-filtering and don't understand
	* 802.1Q
	*/
	struct net_device real_dev; / the underlying device/interface */
	unsigned char real_dev_addr[ETH_ALEN];
	struct proc_dir_entry dent; / Holds the proc data */
	unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
	unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */
	};

	static inline struct vlan_dev_info vlan_dev_info(const struct net_device dev)
	{
	return netdev_priv(dev);
	}

	/* inline functions */
	static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
	unsigned short vlan_tag)
	{
	struct vlan_dev_info *vip = vlan_dev_info(dev);

	return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
	}

	/* VLAN tx hw acceleration helpers. */
	struct vlan_skb_tx_cookie {
	u32 magic;
	u32 vlan_tag;
	};

	#define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */
	#define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
	#define vlan_tx_tag_present(__skb) \
	(VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
	#define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag)

	/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
	static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
	struct vlan_group *grp,
	unsigned short vlan_tag, int polling)
	{
	struct net_device_stats *stats;

	if (skb_bond_should_drop(skb)) {
	dev_kfree_skb_any(skb);
	return NET_RX_DROP;
	}

	skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
	if (skb->dev == NULL) {
	dev_kfree_skb_any(skb);

	/* Not NET_RX_DROP, this is not being dropped
	* due to congestion.
	*/
	return 0;
	}

	skb->dev->last_rx = jiffies;

	stats = &skb->dev->stats;
	stats->rx_packets++;
	stats->rx_bytes += skb->len;

	skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
	switch (skb->pkt_type) {
	case PACKET_BROADCAST:
	break;

	case PACKET_MULTICAST:
	stats->multicast++;
	break;

	case PACKET_OTHERHOST:
	/* Our lower layer thinks this is not local, let's make sure.
	* This allows the VLAN to have a different MAC than the underlying
	* device, and still route correctly.
	*/
	if (!compare_ether_addr(eth_hdr(skb)->h_dest,
	skb->dev->dev_addr))
	skb->pkt_type = PACKET_HOST;
	break;
	};

	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
	}

	static inline int vlan_hwaccel_rx(struct sk_buff *skb,
	struct vlan_group *grp,
	unsigned short vlan_tag)
	{
	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
	}

	static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
	struct vlan_group *grp,
	unsigned short vlan_tag)
	{
	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
	}

	/**
	* __vlan_put_tag - regular VLAN tag inserting
	* @skb: skbuff to tag
	* @tag: VLAN tag to insert
	*
	* Inserts the VLAN tag into @skb as part of the payload
	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	*
	* Following the skb_unshare() example, in case of error, the calling function
	* doesn't have to worry about freeing the original skb.
	*/
	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, unsigned short tag)
	{
	struct vlan_ethhdr *veth;

	if (skb_headroom(skb) < VLAN_HLEN) {
	struct sk_buff *sk_tmp = skb;
	skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
	kfree_skb(sk_tmp);
	if (!skb) {
	printk(KERN_ERR "vlan: failed to realloc headroom\n");
	return NULL;
	}
	} else {
	skb = skb_unshare(skb, GFP_ATOMIC);
	if (!skb) {
	printk(KERN_ERR "vlan: failed to unshare skbuff\n");
	return NULL;
	}
	}

	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);

	/* Move the mac addresses to the beginning of the new header. */
	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);

	/* first, the ethernet type */
	veth->h_vlan_proto = htons(ETH_P_8021Q);

	/* now, the tag */
	veth->h_vlan_TCI = htons(tag);

	skb->protocol = htons(ETH_P_8021Q);
	skb->mac_header -= VLAN_HLEN;
	skb->network_header -= VLAN_HLEN;

	return skb;
	}

	/**
	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	* @skb: skbuff to tag
	* @tag: VLAN tag to insert
	*
	* Puts the VLAN tag in @skb->cb[] and lets the device do the rest
	*/
	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb, unsigned short tag)
	{
	struct vlan_skb_tx_cookie *cookie;

	cookie = VLAN_TX_SKB_CB(skb);
	cookie->magic = VLAN_TX_COOKIE_MAGIC;
	cookie->vlan_tag = tag;

	return skb;
	}

	#define HAVE_VLAN_PUT_TAG

	/**
	* vlan_put_tag - inserts VLAN tag according to device features
	* @skb: skbuff to tag
	* @tag: VLAN tag to insert
	*
	* Assumes skb->dev is the target that will xmit this frame.
	* Returns a VLAN tagged skb.
	*/
	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, unsigned short tag)
	{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
	return __vlan_hwaccel_put_tag(skb, tag);
	} else {
	return __vlan_put_tag(skb, tag);
	}
	}

	/**
	* __vlan_get_tag - get the VLAN ID that is part of the payload
	* @skb: skbuff to query
	* @tag: buffer to store vlaue
	*
	* Returns error if the skb is not of VLAN type
	*/
	static inline int __vlan_get_tag(struct sk_buff skb, unsigned short tag)
	{
	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;

	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
	return -EINVAL;
	}

	*tag = ntohs(veth->h_vlan_TCI);

	return 0;
	}

	/**
	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	* @skb: skbuff to query
	* @tag: buffer to store vlaue
	*
	* Returns error if @skb->cb[] is not set correctly
	*/
	static inline int __vlan_hwaccel_get_tag(struct sk_buff skb, unsigned short tag)
	{
	struct vlan_skb_tx_cookie *cookie;

	cookie = VLAN_TX_SKB_CB(skb);
	if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
	*tag = cookie->vlan_tag;
	return 0;
	} else {
	*tag = 0;
	return -EINVAL;
	}
	}

	#define HAVE_VLAN_GET_TAG

	/**
	* vlan_get_tag - get the VLAN ID from the skb
	* @skb: skbuff to query
	* @tag: buffer to store vlaue
	*
	* Returns error if the skb is not VLAN tagged
	*/
	static inline int vlan_get_tag(struct sk_buff skb, unsigned short tag)
	{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
	return __vlan_hwaccel_get_tag(skb, tag);
	} else {
	return __vlan_get_tag(skb, tag);
	}
	}

	#endif /* __KERNEL__ */

	/* VLAN IOCTLs are found in sockios.h */

	/* Passed in vlan_ioctl_args structure to determine behaviour. */
	enum vlan_ioctl_cmds {
	ADD_VLAN_CMD,
	DEL_VLAN_CMD,
	SET_VLAN_INGRESS_PRIORITY_CMD,
	SET_VLAN_EGRESS_PRIORITY_CMD,
	GET_VLAN_INGRESS_PRIORITY_CMD,
	GET_VLAN_EGRESS_PRIORITY_CMD,
	SET_VLAN_NAME_TYPE_CMD,
	SET_VLAN_FLAG_CMD,
	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
	};

	enum vlan_flags {
	VLAN_FLAG_REORDER_HDR = 0x1,
	};

	enum vlan_name_types {
	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
	VLAN_NAME_TYPE_HIGHEST
	};

	struct vlan_ioctl_args {
	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	char device1[24];

	union {
	char device2[24];
	int VID;
	unsigned int skb_priority;
	unsigned int name_type;
	unsigned int bind_type;
	unsigned int flag; /* Matches vlan_dev_info flags */
	} u;

	short vlan_qos;
	};

	#endif /* !(_LINUX_IF_VLAN_H_) */