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_

 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/bug.h>
 #include <uapi/linux/if_vlan.h>

 #define VLAN_HLEN	4		/* The additional bytes required by VLAN
 					 * (in addition to the Ethernet header)
 					 */
 #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
  *	@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_PRIO_MASK		0xe000 /* Priority Code Point */
 #define VLAN_PRIO_SHIFT		13
 #define VLAN_CFI_MASK		0x1000 /* Canonical Format Indicator */
 #define VLAN_TAG_PRESENT	VLAN_CFI_MASK
 #define VLAN_VID_MASK		0x0fff /* VLAN Identifier */
 #define VLAN_N_VID		4096

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

 static inline bool is_vlan_dev(struct net_device *dev)
 {
         return dev->priv_flags & IFF_802_1Q_VLAN;
 }

 #define vlan_tx_tag_present(__skb)	((__skb)->vlan_tci & VLAN_TAG_PRESENT)
 #define vlan_tx_tag_get(__skb)		((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
 #define vlan_tx_tag_get_id(__skb)	((__skb)->vlan_tci & VLAN_VID_MASK)

 /**
  *	struct vlan_pcpu_stats - VLAN percpu rx/tx stats
  *	@rx_packets: number of received packets
  *	@rx_bytes: number of received bytes
  *	@rx_multicast: number of received multicast packets
  *	@tx_packets: number of transmitted packets
  *	@tx_bytes: number of transmitted bytes
  *	@syncp: synchronization point for 64bit counters
  *	@rx_errors: number of rx errors
  *	@tx_dropped: number of tx drops
  */
 struct vlan_pcpu_stats {
 	u64			rx_packets;
 	u64			rx_bytes;
 	u64			rx_multicast;
 	u64			tx_packets;
 	u64			tx_bytes;
 	struct u64_stats_sync	syncp;
 	u32			rx_errors;
 	u32			tx_dropped;
 };

 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)

 extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
 					       __be16 vlan_proto, u16 vlan_id);
 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
 extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);

 /**
  *	struct vlan_priority_tci_mapping - vlan egress priority mappings
  *	@priority: skb priority
  *	@vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
  *	@next: pointer to next struct
  */
 struct vlan_priority_tci_mapping {
 	u32					priority;
 	u16					vlan_qos;
 	struct vlan_priority_tci_mapping	*next;
 };

 struct proc_dir_entry;
 struct netpoll;

 /**
  *	struct vlan_dev_priv - VLAN private device data
  *	@nr_ingress_mappings: number of ingress priority mappings
  *	@ingress_priority_map: ingress priority mappings
  *	@nr_egress_mappings: number of egress priority mappings
  *	@egress_priority_map: hash of egress priority mappings
  *	@vlan_proto: VLAN encapsulation protocol
  *	@vlan_id: VLAN identifier
  *	@flags: device flags
  *	@real_dev: underlying netdevice
  *	@real_dev_addr: address of underlying netdevice
  *	@dent: proc dir entry
  *	@vlan_pcpu_stats: ptr to percpu rx stats
  */
 struct vlan_dev_priv {
 	unsigned int				nr_ingress_mappings;
 	u32					ingress_priority_map[8];
 	unsigned int				nr_egress_mappings;
 	struct vlan_priority_tci_mapping	*egress_priority_map[16];

 	__be16					vlan_proto;
 	u16					vlan_id;
 	u16					flags;

 	struct net_device			*real_dev;
 	unsigned char				real_dev_addr[ETH_ALEN];

 	struct proc_dir_entry			*dent;
 	struct vlan_pcpu_stats __percpu		*vlan_pcpu_stats;
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	struct netpoll				*netpoll;
 #endif
 	unsigned int				nest_level;
 };

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

 static inline u16
 vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
 {
 	struct vlan_priority_tci_mapping *mp;

 	smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */

 	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
 	while (mp) {
 		if (mp->priority == skprio) {
 			return mp->vlan_qos; /* This should already be shifted
 					      * to mask correctly with the
 					      * VLAN's TCI */
 		}
 		mp = mp->next;
 	}
 	return 0;
 }

 extern bool vlan_do_receive(struct sk_buff **skb);

 extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
 extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);

 extern int vlan_vids_add_by_dev(struct net_device *dev,
 				const struct net_device *by_dev);
 extern void vlan_vids_del_by_dev(struct net_device *dev,
 				 const struct net_device *by_dev);

 extern bool vlan_uses_dev(const struct net_device *dev);

 static inline int vlan_get_encap_level(struct net_device *dev)
 {
 	BUG_ON(!is_vlan_dev(dev));
 	return vlan_dev_priv(dev)->nest_level;
 }
 #else
 static inline struct net_device *
 __vlan_find_dev_deep_rcu(struct net_device *real_dev,
 		     __be16 vlan_proto, u16 vlan_id)
 {
 	return NULL;
 }

 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
 {
 	BUG();
 	return NULL;
 }

 static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
 {
 	BUG();
 	return 0;
 }

 static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
 {
 	BUG();
 	return 0;
 }

 static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
 					       u32 skprio)
 {
 	return 0;
 }

 static inline bool vlan_do_receive(struct sk_buff **skb)
 {
 	return false;
 }

 static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
 {
 	return 0;
 }

 static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
 {
 }

 static inline int vlan_vids_add_by_dev(struct net_device *dev,
 				       const struct net_device *by_dev)
 {
 	return 0;
 }

 static inline void vlan_vids_del_by_dev(struct net_device *dev,
 					const struct net_device *by_dev)
 {
 }

 static inline bool vlan_uses_dev(const struct net_device *dev)
 {
 	return false;
 }
 static inline int vlan_get_encap_level(struct net_device *dev)
 {
 	BUG();
 	return 0;
 }
 #endif

 static inline bool vlan_hw_offload_capable(netdev_features_t features,
 					   __be16 proto)
 {
 	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
 		return true;
 	if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
 		return true;
 	return false;
 }

 /**
  * __vlan_insert_tag - regular VLAN tag inserting
  * @skb: skbuff to tag
  * @vlan_proto: VLAN encapsulation protocol
  * @vlan_tci: VLAN TCI to insert
  *
  * Inserts the VLAN tag into @skb as part of the payload
  * Returns error if skb_cow_head failes.
  *
  * Does not change skb->protocol so this function can be used during receive.
  */
 static inline int __vlan_insert_tag(struct sk_buff *skb,
 				    __be16 vlan_proto, u16 vlan_tci)
 {
 	struct vlan_ethhdr *veth;

 	if (skb_cow_head(skb, VLAN_HLEN) < 0)
 		return -ENOMEM;

 	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 * ETH_ALEN);
 	skb->mac_header -= VLAN_HLEN;

 	/* first, the ethernet type */
 	veth->h_vlan_proto = vlan_proto;

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

 	return 0;
 }

 /**
  * vlan_insert_tag - regular VLAN tag inserting
  * @skb: skbuff to tag
  * @vlan_proto: VLAN encapsulation protocol
  * @vlan_tci: VLAN TCI 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.
  *
  * Does not change skb->protocol so this function can be used during receive.
  */
 static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
 					      __be16 vlan_proto, u16 vlan_tci)
 {
 	int err;

 	err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
 	if (err) {
 		dev_kfree_skb_any(skb);
 		return NULL;
 	}
 	return skb;
 }

 /**
  * vlan_insert_tag_set_proto - regular VLAN tag inserting
  * @skb: skbuff to tag
  * @vlan_proto: VLAN encapsulation protocol
  * @vlan_tci: VLAN TCI 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_insert_tag_set_proto(struct sk_buff *skb,
 							__be16 vlan_proto,
 							u16 vlan_tci)
 {
 	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
 	if (skb)
 		skb->protocol = vlan_proto;
 	return skb;
 }

 /*
  * __vlan_hwaccel_push_inside - pushes vlan tag to the payload
  * @skb: skbuff to tag
  *
  * Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
  *
  * 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_hwaccel_push_inside(struct sk_buff *skb)
 {
 	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 					vlan_tx_tag_get(skb));
 	if (likely(skb))
 		skb->vlan_tci = 0;
 	return skb;
 }
 /*
  * vlan_hwaccel_push_inside - pushes vlan tag to the payload
  * @skb: skbuff to tag
  *
  * Checks is tag is present in @skb->vlan_tci and if it is, it pushes the
  * VLAN tag from @skb->vlan_tci inside to the payload.
  *
  * 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_hwaccel_push_inside(struct sk_buff *skb)
 {
 	if (vlan_tx_tag_present(skb))
 		skb = __vlan_hwaccel_push_inside(skb);
 	return skb;
 }

 /**
  * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
  * @skb: skbuff to tag
  * @vlan_proto: VLAN encapsulation protocol
  * @vlan_tci: VLAN TCI to insert
  *
  * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
  */
 static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
 					  __be16 vlan_proto, u16 vlan_tci)
 {
 	skb->vlan_proto = vlan_proto;
 	skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
 }

 /**
  * __vlan_get_tag - get the VLAN ID that is part of the payload
  * @skb: skbuff to query
  * @vlan_tci: buffer to store vlaue
  *
  * Returns error if the skb is not of VLAN type
  */
 static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
 {
 	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;

 	if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
 	    veth->h_vlan_proto != htons(ETH_P_8021AD))
 		return -EINVAL;

 	*vlan_tci = ntohs(veth->h_vlan_TCI);
 	return 0;
 }

 /**
  * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
  * @skb: skbuff to query
  * @vlan_tci: buffer to store vlaue
  *
  * Returns error if @skb->vlan_tci is not set correctly
  */
 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
 					 u16 *vlan_tci)
 {
 	if (vlan_tx_tag_present(skb)) {
 		*vlan_tci = vlan_tx_tag_get(skb);
 		return 0;
 	} else {
 		*vlan_tci = 0;
 		return -EINVAL;
 	}
 }

 #define HAVE_VLAN_GET_TAG

 /**
  * vlan_get_tag - get the VLAN ID from the skb
  * @skb: skbuff to query
  * @vlan_tci: buffer to store vlaue
  *
  * Returns error if the skb is not VLAN tagged
  */
 static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
 {
 	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
 		return __vlan_hwaccel_get_tag(skb, vlan_tci);
 	} else {
 		return __vlan_get_tag(skb, vlan_tci);
 	}
 }

 /**
  * vlan_get_protocol - get protocol EtherType.
  * @skb: skbuff to query
  * @type: first vlan protocol
  * @depth: buffer to store length of eth and vlan tags in bytes
  *
  * Returns the EtherType of the packet, regardless of whether it is
  * vlan encapsulated (normal or hardware accelerated) or not.
  */
 static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type,
 					 int *depth)
 {
 	unsigned int vlan_depth = skb->mac_len;

 	/* if type is 802.1Q/AD then the header should already be
 	 * present at mac_len - VLAN_HLEN (if mac_len > 0), or at
 	 * ETH_HLEN otherwise
 	 */
 	if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) {
 		if (vlan_depth) {
 			if (WARN_ON(vlan_depth < VLAN_HLEN))
 				return 0;
 			vlan_depth -= VLAN_HLEN;
 		} else {
 			vlan_depth = ETH_HLEN;
 		}
 		do {
 			struct vlan_hdr *vh;

 			if (unlikely(!pskb_may_pull(skb,
 						    vlan_depth + VLAN_HLEN)))
 				return 0;

 			vh = (struct vlan_hdr *)(skb->data + vlan_depth);
 			type = vh->h_vlan_encapsulated_proto;
 			vlan_depth += VLAN_HLEN;
 		} while (type == htons(ETH_P_8021Q) ||
 			 type == htons(ETH_P_8021AD));
 	}

 	if (depth)
 		*depth = vlan_depth;

 	return type;
 }

 /**
  * vlan_get_protocol - get protocol EtherType.
  * @skb: skbuff to query
  *
  * Returns the EtherType of the packet, regardless of whether it is
  * vlan encapsulated (normal or hardware accelerated) or not.
  */
 static inline __be16 vlan_get_protocol(struct sk_buff *skb)
 {
 	return __vlan_get_protocol(skb, skb->protocol, NULL);
 }

 static inline void vlan_set_encap_proto(struct sk_buff *skb,
 					struct vlan_hdr *vhdr)
 {
 	__be16 proto;
 	unsigned short *rawp;

 	/*
 	 * Was a VLAN packet, grab the encapsulated protocol, which the layer
 	 * three protocols care about.
 	 */

 	proto = vhdr->h_vlan_encapsulated_proto;
 	if (ntohs(proto) >= ETH_P_802_3_MIN) {
 		skb->protocol = proto;
 		return;
 	}

 	rawp = (unsigned short *)(vhdr + 1);
 	if (*rawp == 0xFFFF)
 		/*
 		 * This is a magic hack to spot IPX packets. Older Novell
 		 * breaks the protocol design and runs IPX over 802.3 without
 		 * an 802.2 LLC layer. We look for FFFF which isn't a used
 		 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 		 * but does for the rest.
 		 */
 		skb->protocol = htons(ETH_P_802_3);
 	else
 		/*
 		 * Real 802.2 LLC
 		 */
 		skb->protocol = htons(ETH_P_802_2);
 }

 #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_

	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/rtnetlink.h>
	#include <linux/bug.h>
	#include <uapi/linux/if_vlan.h>

	#define VLAN_HLEN 4 /* The additional bytes required by VLAN
	* (in addition to the Ethernet header)
	*/
	#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
	* @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_PRIO_MASK 0xe000 /* Priority Code Point */
	#define VLAN_PRIO_SHIFT 13
	#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
	#define VLAN_TAG_PRESENT VLAN_CFI_MASK
	#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
	#define VLAN_N_VID 4096

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

	static inline bool is_vlan_dev(struct net_device *dev)
	{
	return dev->priv_flags & IFF_802_1Q_VLAN;
	}

	#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
	#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
	#define vlan_tx_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)

	/**
	* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
	* @rx_packets: number of received packets
	* @rx_bytes: number of received bytes
	* @rx_multicast: number of received multicast packets
	* @tx_packets: number of transmitted packets
	* @tx_bytes: number of transmitted bytes
	* @syncp: synchronization point for 64bit counters
	* @rx_errors: number of rx errors
	* @tx_dropped: number of tx drops
	*/
	struct vlan_pcpu_stats {
	u64 rx_packets;
	u64 rx_bytes;
	u64 rx_multicast;
	u64 tx_packets;
	u64 tx_bytes;
	struct u64_stats_sync syncp;
	u32 rx_errors;
	u32 tx_dropped;
	};

	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)

	extern struct net_device __vlan_find_dev_deep_rcu(struct net_device real_dev,
	__be16 vlan_proto, u16 vlan_id);
	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
	extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);

	/**
	* struct vlan_priority_tci_mapping - vlan egress priority mappings
	* @priority: skb priority
	* @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
	* @next: pointer to next struct
	*/
	struct vlan_priority_tci_mapping {
	u32 priority;
	u16 vlan_qos;
	struct vlan_priority_tci_mapping *next;
	};

	struct proc_dir_entry;
	struct netpoll;

	/**
	* struct vlan_dev_priv - VLAN private device data
	* @nr_ingress_mappings: number of ingress priority mappings
	* @ingress_priority_map: ingress priority mappings
	* @nr_egress_mappings: number of egress priority mappings
	* @egress_priority_map: hash of egress priority mappings
	* @vlan_proto: VLAN encapsulation protocol
	* @vlan_id: VLAN identifier
	* @flags: device flags
	* @real_dev: underlying netdevice
	* @real_dev_addr: address of underlying netdevice
	* @dent: proc dir entry
	* @vlan_pcpu_stats: ptr to percpu rx stats
	*/
	struct vlan_dev_priv {
	unsigned int nr_ingress_mappings;
	u32 ingress_priority_map[8];
	unsigned int nr_egress_mappings;
	struct vlan_priority_tci_mapping *egress_priority_map[16];

	__be16 vlan_proto;
	u16 vlan_id;
	u16 flags;

	struct net_device *real_dev;
	unsigned char real_dev_addr[ETH_ALEN];

	struct proc_dir_entry *dent;
	struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
	#ifdef CONFIG_NET_POLL_CONTROLLER
	struct netpoll *netpoll;
	#endif
	unsigned int nest_level;
	};

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

	static inline u16
	vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
	{
	struct vlan_priority_tci_mapping *mp;

	smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */

	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
	while (mp) {
	if (mp->priority == skprio) {
	return mp->vlan_qos; /* This should already be shifted
	* to mask correctly with the
	* VLAN's TCI */
	}
	mp = mp->next;
	}
	return 0;
	}

	extern bool vlan_do_receive(struct sk_buff **skb);

	extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
	extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);

	extern int vlan_vids_add_by_dev(struct net_device *dev,
	const struct net_device *by_dev);
	extern void vlan_vids_del_by_dev(struct net_device *dev,
	const struct net_device *by_dev);

	extern bool vlan_uses_dev(const struct net_device *dev);

	static inline int vlan_get_encap_level(struct net_device *dev)
	{
	BUG_ON(!is_vlan_dev(dev));
	return vlan_dev_priv(dev)->nest_level;
	}
	#else
	static inline struct net_device *
	__vlan_find_dev_deep_rcu(struct net_device *real_dev,
	__be16 vlan_proto, u16 vlan_id)
	{
	return NULL;
	}

	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	{
	BUG();
	return NULL;
	}

	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	{
	BUG();
	return 0;
	}

	static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
	{
	BUG();
	return 0;
	}

	static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
	u32 skprio)
	{
	return 0;
	}

	static inline bool vlan_do_receive(struct sk_buff **skb)
	{
	return false;
	}

	static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
	{
	return 0;
	}

	static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
	{
	}

	static inline int vlan_vids_add_by_dev(struct net_device *dev,
	const struct net_device *by_dev)
	{
	return 0;
	}

	static inline void vlan_vids_del_by_dev(struct net_device *dev,
	const struct net_device *by_dev)
	{
	}

	static inline bool vlan_uses_dev(const struct net_device *dev)
	{
	return false;
	}
	static inline int vlan_get_encap_level(struct net_device *dev)
	{
	BUG();
	return 0;
	}
	#endif

	static inline bool vlan_hw_offload_capable(netdev_features_t features,
	__be16 proto)
	{
	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
	return true;
	if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
	return true;
	return false;
	}

	/**
	* __vlan_insert_tag - regular VLAN tag inserting
	* @skb: skbuff to tag
	* @vlan_proto: VLAN encapsulation protocol
	* @vlan_tci: VLAN TCI to insert
	*
	* Inserts the VLAN tag into @skb as part of the payload
	* Returns error if skb_cow_head failes.
	*
	* Does not change skb->protocol so this function can be used during receive.
	*/
	static inline int __vlan_insert_tag(struct sk_buff *skb,
	__be16 vlan_proto, u16 vlan_tci)
	{
	struct vlan_ethhdr *veth;

	if (skb_cow_head(skb, VLAN_HLEN) < 0)
	return -ENOMEM;

	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 * ETH_ALEN);
	skb->mac_header -= VLAN_HLEN;

	/* first, the ethernet type */
	veth->h_vlan_proto = vlan_proto;

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

	return 0;
	}

	/**
	* vlan_insert_tag - regular VLAN tag inserting
	* @skb: skbuff to tag
	* @vlan_proto: VLAN encapsulation protocol
	* @vlan_tci: VLAN TCI 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.
	*
	* Does not change skb->protocol so this function can be used during receive.
	*/
	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb,
	__be16 vlan_proto, u16 vlan_tci)
	{
	int err;

	err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
	if (err) {
	dev_kfree_skb_any(skb);
	return NULL;
	}
	return skb;
	}

	/**
	* vlan_insert_tag_set_proto - regular VLAN tag inserting
	* @skb: skbuff to tag
	* @vlan_proto: VLAN encapsulation protocol
	* @vlan_tci: VLAN TCI 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_insert_tag_set_proto(struct sk_buff skb,
	__be16 vlan_proto,
	u16 vlan_tci)
	{
	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
	if (skb)
	skb->protocol = vlan_proto;
	return skb;
	}

	/*
	* __vlan_hwaccel_push_inside - pushes vlan tag to the payload
	* @skb: skbuff to tag
	*
	* Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
	*
	* 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_hwaccel_push_inside(struct sk_buff skb)
	{
	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
	vlan_tx_tag_get(skb));
	if (likely(skb))
	skb->vlan_tci = 0;
	return skb;
	}
	/*
	* vlan_hwaccel_push_inside - pushes vlan tag to the payload
	* @skb: skbuff to tag
	*
	* Checks is tag is present in @skb->vlan_tci and if it is, it pushes the
	* VLAN tag from @skb->vlan_tci inside to the payload.
	*
	* 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_hwaccel_push_inside(struct sk_buff skb)
	{
	if (vlan_tx_tag_present(skb))
	skb = __vlan_hwaccel_push_inside(skb);
	return skb;
	}

	/**
	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	* @skb: skbuff to tag
	* @vlan_proto: VLAN encapsulation protocol
	* @vlan_tci: VLAN TCI to insert
	*
	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
	*/
	static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
	__be16 vlan_proto, u16 vlan_tci)
	{
	skb->vlan_proto = vlan_proto;
	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
	}

	/**
	* __vlan_get_tag - get the VLAN ID that is part of the payload
	* @skb: skbuff to query
	* @vlan_tci: buffer to store vlaue
	*
	* Returns error if the skb is not of VLAN type
	*/
	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
	{
	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;

	if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
	veth->h_vlan_proto != htons(ETH_P_8021AD))
	return -EINVAL;

	*vlan_tci = ntohs(veth->h_vlan_TCI);
	return 0;
	}

	/**
	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	* @skb: skbuff to query
	* @vlan_tci: buffer to store vlaue
	*
	* Returns error if @skb->vlan_tci is not set correctly
	*/
	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
	u16 *vlan_tci)
	{
	if (vlan_tx_tag_present(skb)) {
	*vlan_tci = vlan_tx_tag_get(skb);
	return 0;
	} else {
	*vlan_tci = 0;
	return -EINVAL;
	}
	}

	#define HAVE_VLAN_GET_TAG

	/**
	* vlan_get_tag - get the VLAN ID from the skb
	* @skb: skbuff to query
	* @vlan_tci: buffer to store vlaue
	*
	* Returns error if the skb is not VLAN tagged
	*/
	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
	{
	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
	return __vlan_hwaccel_get_tag(skb, vlan_tci);
	} else {
	return __vlan_get_tag(skb, vlan_tci);
	}
	}

	/**
	* vlan_get_protocol - get protocol EtherType.
	* @skb: skbuff to query
	* @type: first vlan protocol
	* @depth: buffer to store length of eth and vlan tags in bytes
	*
	* Returns the EtherType of the packet, regardless of whether it is
	* vlan encapsulated (normal or hardware accelerated) or not.
	*/
	static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type,
	int *depth)
	{
	unsigned int vlan_depth = skb->mac_len;

	/* if type is 802.1Q/AD then the header should already be
	* present at mac_len - VLAN_HLEN (if mac_len > 0), or at
	* ETH_HLEN otherwise
	*/
	if (type == htons(ETH_P_8021Q) \|\| type == htons(ETH_P_8021AD)) {
	if (vlan_depth) {
	if (WARN_ON(vlan_depth < VLAN_HLEN))
	return 0;
	vlan_depth -= VLAN_HLEN;
	} else {
	vlan_depth = ETH_HLEN;
	}
	do {
	struct vlan_hdr *vh;

	if (unlikely(!pskb_may_pull(skb,
	vlan_depth + VLAN_HLEN)))
	return 0;

	vh = (struct vlan_hdr *)(skb->data + vlan_depth);
	type = vh->h_vlan_encapsulated_proto;
	vlan_depth += VLAN_HLEN;
	} while (type == htons(ETH_P_8021Q) \|\|
	type == htons(ETH_P_8021AD));
	}

	if (depth)
	*depth = vlan_depth;

	return type;
	}

	/**
	* vlan_get_protocol - get protocol EtherType.
	* @skb: skbuff to query
	*
	* Returns the EtherType of the packet, regardless of whether it is
	* vlan encapsulated (normal or hardware accelerated) or not.
	*/
	static inline __be16 vlan_get_protocol(struct sk_buff *skb)
	{
	return __vlan_get_protocol(skb, skb->protocol, NULL);
	}

	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	struct vlan_hdr *vhdr)
	{
	__be16 proto;
	unsigned short *rawp;

	/*
	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	* three protocols care about.
	*/

	proto = vhdr->h_vlan_encapsulated_proto;
	if (ntohs(proto) >= ETH_P_802_3_MIN) {
	skb->protocol = proto;
	return;
	}

	rawp = (unsigned short *)(vhdr + 1);
	if (*rawp == 0xFFFF)
	/*
	* This is a magic hack to spot IPX packets. Older Novell
	* breaks the protocol design and runs IPX over 802.3 without
	* an 802.2 LLC layer. We look for FFFF which isn't a used
	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	* but does for the rest.
	*/
	skb->protocol = htons(ETH_P_802_3);
	else
	/*
	* Real 802.2 LLC
	*/
	skb->protocol = htons(ETH_P_802_2);
	}

	#endif /* !(_LINUX_IF_VLAN_H_) */