[linux-2.6-block.git] / include / 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 skb_vlan_tag_present(__skb)	((__skb)->vlan_tci & VLAN_TAG_PRESENT)
#define skb_vlan_tag_get(__skb)		((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
#define skb_vlan_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,
					skb_vlan_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 (skb_vlan_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 value
 *
 * 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 value
 *
 * 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 (skb_vlan_tag_present(skb)) {
		*vlan_tci = skb_vlan_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 value
 *
 * 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 (eth_proto_is_802_3(proto)) {
		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);
}

/**
 * skb_vlan_tagged - check if skb is vlan tagged.
 * @skb: skbuff to query
 *
 * Returns true if the skb is tagged, regardless of whether it is hardware
 * accelerated or not.
 */
static inline bool skb_vlan_tagged(const struct sk_buff *skb)
{
	if (!skb_vlan_tag_present(skb) &&
	    likely(skb->protocol != htons(ETH_P_8021Q) &&
		   skb->protocol != htons(ETH_P_8021AD)))
		return false;

	return true;
}

/**
 * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
 * @skb: skbuff to query
 *
 * Returns true if the skb is tagged with multiple vlan headers, regardless
 * of whether it is hardware accelerated or not.
 */
static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
{
	__be16 protocol = skb->protocol;

	if (!skb_vlan_tag_present(skb)) {
		struct vlan_ethhdr *veh;

		if (likely(protocol != htons(ETH_P_8021Q) &&
			   protocol != htons(ETH_P_8021AD)))
			return false;

		veh = (struct vlan_ethhdr *)skb->data;
		protocol = veh->h_vlan_encapsulated_proto;
	}

	if (protocol != htons(ETH_P_8021Q) && protocol != htons(ETH_P_8021AD))
		return false;

	return true;
}

/**
 * vlan_features_check - drop unsafe features for skb with multiple tags.
 * @skb: skbuff to query
 * @features: features to be checked
 *
 * Returns features without unsafe ones if the skb has multiple tags.
 */
static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
						    netdev_features_t features)
{
	if (skb_vlan_tagged_multi(skb))
		features = netdev_intersect_features(features,
						     NETIF_F_SG |
						     NETIF_F_HIGHDMA |
						     NETIF_F_FRAGLIST |
						     NETIF_F_GEN_CSUM |
						     NETIF_F_HW_VLAN_CTAG_TX |
						     NETIF_F_HW_VLAN_STAG_TX);

	return features;
}

/**
 * compare_vlan_header - Compare two vlan headers
 * @h1: Pointer to vlan header
 * @h2: Pointer to vlan header
 *
 * Compare two vlan headers, returns 0 if equal.
 *
 * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits.
 */
static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1,
						const struct vlan_hdr *h2)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
	return *(u32 *)h1 ^ *(u32 *)h2;
#else
	return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) |
	       ((__force u32)h1->h_vlan_encapsulated_proto ^
		(__force u32)h2->h_vlan_encapsulated_proto);
#endif
}
#endif /* !(_LINUX_IF_VLAN_H_) */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* VLAN An implementation of 802.1Q VLAN tagging.
	3	*
	4	* Authors: Ben Greear <greearb@candelatech.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*
	11	*/
1da177e4 LT	12	#ifndef _LINUX_IF_VLAN_H_
	13	#define _LINUX_IF_VLAN_H_
	14
1da177e4	15	#include <linux/netdevice.h>
0610d11b	16	#include <linux/etherdevice.h>
65ac6a5f	17	#include <linux/rtnetlink.h>
187f1882	18	#include <linux/bug.h>
607ca46e	19	#include <uapi/linux/if_vlan.h>
1da177e4	20
a3f671b3 JP	21	#define VLAN_HLEN 4 /* The additional bytes required by VLAN
a3f671b3 JP	22	* (in addition to the Ethernet header)
1da177e4	23	*/
1da177e4 LT	24	#define VLAN_ETH_HLEN 18 /* Total octets in header. */
	25	#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
	26
	27	/*
	28	* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
	29	*/
	30	#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
	31	#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
	32
740c15d0 PM	33	/*
	34	* struct vlan_hdr - vlan header
	35	* @h_vlan_TCI: priority and VLAN ID
	36	* @h_vlan_encapsulated_proto: packet type ID or len
	37	*/
	38	struct vlan_hdr {
	39	__be16 h_vlan_TCI;
	40	__be16 h_vlan_encapsulated_proto;
	41	};
	42
	43	/**
	44	* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
	45	* @h_dest: destination ethernet address
	46	* @h_source: source ethernet address
a7bf5804	47	* @h_vlan_proto: ethernet protocol
740c15d0 PM	48	* @h_vlan_TCI: priority and VLAN ID
	49	* @h_vlan_encapsulated_proto: packet type ID or len
	50	*/
1da177e4	51	struct vlan_ethhdr {
740c15d0 PM	52	unsigned char h_dest[ETH_ALEN];
	53	unsigned char h_source[ETH_ALEN];
	54	__be16 h_vlan_proto;
	55	__be16 h_vlan_TCI;
	56	__be16 h_vlan_encapsulated_proto;
1da177e4 LT	57	};
	58
	59	#include <linux/skbuff.h>
	60
	61	static inline struct vlan_ethhdr vlan_eth_hdr(const struct sk_buff skb)
	62	{
98e399f8	63	return (struct vlan_ethhdr *)skb_mac_header(skb);
1da177e4 LT	64	}
1da177e4 LT	65
05423b24 ED	66	#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
	67	#define VLAN_PRIO_SHIFT 13
	68	#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
	69	#define VLAN_TAG_PRESENT VLAN_CFI_MASK
	70	#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
b738127d	71	#define VLAN_N_VID 4096
1da177e4 LT	72
1da177e4 LT	73	/* found in socket.c */
881d966b	74	extern void vlan_ioctl_set(int (hook)(struct net , void __user *));
1da177e4	75
d38569ab	76	static inline bool is_vlan_dev(struct net_device *dev)
6dcbbe25 NH	77	{
	78	return dev->priv_flags & IFF_802_1Q_VLAN;
	79	}
	80
df8a39de JP	81	#define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
	82	#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
	83	#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
1da177e4	84
e267cb96 DM	85	/**
	86	* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
	87	* @rx_packets: number of received packets
	88	* @rx_bytes: number of received bytes
	89	* @rx_multicast: number of received multicast packets
	90	* @tx_packets: number of transmitted packets
	91	* @tx_bytes: number of transmitted bytes
	92	* @syncp: synchronization point for 64bit counters
	93	* @rx_errors: number of rx errors
	94	* @tx_dropped: number of tx drops
	95	*/
	96	struct vlan_pcpu_stats {
	97	u64 rx_packets;
	98	u64 rx_bytes;
	99	u64 rx_multicast;
	100	u64 tx_packets;
	101	u64 tx_bytes;
	102	struct u64_stats_sync syncp;
	103	u32 rx_errors;
	104	u32 tx_dropped;
	105	};
	106
1e85c9b6 HFS	107	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
1e85c9b6 HFS	108
f06c7f9f	109	extern struct net_device __vlan_find_dev_deep_rcu(struct net_device real_dev,
1e85c9b6 HFS	110	__be16 vlan_proto, u16 vlan_id);
	111	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	112	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
71e415e4	113	extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
1e85c9b6 HFS	114
	115	/**
	116	* struct vlan_priority_tci_mapping - vlan egress priority mappings
	117	* @priority: skb priority
	118	* @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
	119	* @next: pointer to next struct
	120	*/
	121	struct vlan_priority_tci_mapping {
	122	u32 priority;
	123	u16 vlan_qos;
	124	struct vlan_priority_tci_mapping *next;
	125	};
	126
e267cb96 DM	127	struct proc_dir_entry;
	128	struct netpoll;
	129
	130	/**
	131	* struct vlan_dev_priv - VLAN private device data
	132	* @nr_ingress_mappings: number of ingress priority mappings
	133	* @ingress_priority_map: ingress priority mappings
	134	* @nr_egress_mappings: number of egress priority mappings
	135	* @egress_priority_map: hash of egress priority mappings
	136	* @vlan_proto: VLAN encapsulation protocol
	137	* @vlan_id: VLAN identifier
	138	* @flags: device flags
	139	* @real_dev: underlying netdevice
	140	* @real_dev_addr: address of underlying netdevice
	141	* @dent: proc dir entry
	142	* @vlan_pcpu_stats: ptr to percpu rx stats
	143	*/
	144	struct vlan_dev_priv {
	145	unsigned int nr_ingress_mappings;
	146	u32 ingress_priority_map[8];
	147	unsigned int nr_egress_mappings;
	148	struct vlan_priority_tci_mapping *egress_priority_map[16];
	149
	150	__be16 vlan_proto;
	151	u16 vlan_id;
	152	u16 flags;
	153
	154	struct net_device *real_dev;
	155	unsigned char real_dev_addr[ETH_ALEN];
	156
	157	struct proc_dir_entry *dent;
	158	struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
	159	#ifdef CONFIG_NET_POLL_CONTROLLER
	160	struct netpoll *netpoll;
	161	#endif
d38569ab	162	unsigned int nest_level;
e267cb96 DM	163	};
	164
	165	static inline struct vlan_dev_priv vlan_dev_priv(const struct net_device dev)
	166	{
	167	return netdev_priv(dev);
	168	}
	169
	170	static inline u16
	171	vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
	172	{
	173	struct vlan_priority_tci_mapping *mp;
	174
	175	smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
	176
	177	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
	178	while (mp) {
	179	if (mp->priority == skprio) {
	180	return mp->vlan_qos; /* This should already be shifted
	181	* to mask correctly with the
	182	* VLAN's TCI */
	183	}
	184	mp = mp->next;
	185	}
	186	return 0;
	187	}
	188
48cc32d3	189	extern bool vlan_do_receive(struct sk_buff **skb);
9b22ea56	190
80d5c368 PM	191	extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
80d5c368 PM	192	extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
87002b03	193
348a1443 JP	194	extern int vlan_vids_add_by_dev(struct net_device *dev,
	195	const struct net_device *by_dev);
	196	extern void vlan_vids_del_by_dev(struct net_device *dev,
	197	const struct net_device *by_dev);
9b361c13 JP	198
9b361c13 JP	199	extern bool vlan_uses_dev(const struct net_device *dev);
e1618d46 VY	200
	201	static inline int vlan_get_encap_level(struct net_device *dev)
	202	{
	203	BUG_ON(!is_vlan_dev(dev));
	204	return vlan_dev_priv(dev)->nest_level;
	205	}
7750f403	206	#else
cec9c133	207	static inline struct net_device *
f06c7f9f	208	__vlan_find_dev_deep_rcu(struct net_device *real_dev,
9fae27b3	209	__be16 vlan_proto, u16 vlan_id)
cec9c133 JP	210	{
	211	return NULL;
	212	}
	213
22d1ba74 PM	214	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	215	{
	216	BUG();
	217	return NULL;
	218	}
	219
	220	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	221	{
	222	BUG();
	223	return 0;
	224	}
	225
71e415e4	226	static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
	227	{
	228	BUG();
	229	return 0;
	230	}
	231
d3243539 EP	232	static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
	233	u32 skprio)
	234	{
	235	return 0;
	236	}
	237
48cc32d3	238	static inline bool vlan_do_receive(struct sk_buff **skb)
9b22ea56	239	{
3701e513	240	return false;
9b22ea56	241	}
e1c096e2	242
9fae27b3	243	static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
87002b03 JP	244	{
	245	return 0;
	246	}
	247
9fae27b3	248	static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
87002b03 JP	249	{
87002b03 JP	250	}
348a1443 JP	251
	252	static inline int vlan_vids_add_by_dev(struct net_device *dev,
	253	const struct net_device *by_dev)
	254	{
	255	return 0;
	256	}
	257
	258	static inline void vlan_vids_del_by_dev(struct net_device *dev,
	259	const struct net_device *by_dev)
	260	{
	261	}
9b361c13 JP	262
	263	static inline bool vlan_uses_dev(const struct net_device *dev)
	264	{
	265	return false;
	266	}
e1618d46 VY	267	static inline int vlan_get_encap_level(struct net_device *dev)
	268	{
	269	BUG();
	270	return 0;
	271	}
7750f403	272	#endif
1da177e4	273
86a9bad3 PM	274	static inline bool vlan_hw_offload_capable(netdev_features_t features,
	275	__be16 proto)
	276	{
	277	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
	278	return true;
8ad227ff PM	279	if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
8ad227ff PM	280	return true;
86a9bad3 PM	281	return false;
	282	}
	283
1da177e4	284	/**
15255a43	285	* __vlan_insert_tag - regular VLAN tag inserting
1da177e4	286	* @skb: skbuff to tag
86a9bad3	287	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	288	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	289	*
1da177e4 LT	290	* Inserts the VLAN tag into @skb as part of the payload
15255a43	291	* Returns error if skb_cow_head failes.
0b5c9db1 JP	292	*
0b5c9db1 JP	293	* Does not change skb->protocol so this function can be used during receive.
1da177e4	294	*/
15255a43 JP	295	static inline int __vlan_insert_tag(struct sk_buff *skb,
15255a43 JP	296	__be16 vlan_proto, u16 vlan_tci)
1da177e4 LT	297	{
	298	struct vlan_ethhdr *veth;
	299
15255a43 JP	300	if (skb_cow_head(skb, VLAN_HLEN) < 0)
	301	return -ENOMEM;
	302
1da177e4 LT	303	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	304
	305	/* Move the mac addresses to the beginning of the new header. */
a3f671b3	306	memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
e4dd6188	307	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	308
1da177e4 LT	309	/* first, the ethernet type */
86a9bad3	310	veth->h_vlan_proto = vlan_proto;
1da177e4	311
9bb8582e PM	312	/* now, the TCI */
9bb8582e PM	313	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	314
15255a43 JP	315	return 0;
	316	}
	317
	318	/**
	319	* vlan_insert_tag - regular VLAN tag inserting
	320	* @skb: skbuff to tag
	321	* @vlan_proto: VLAN encapsulation protocol
	322	* @vlan_tci: VLAN TCI to insert
	323	*
	324	* Inserts the VLAN tag into @skb as part of the payload
	325	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	326	*
	327	* Following the skb_unshare() example, in case of error, the calling function
	328	* doesn't have to worry about freeing the original skb.
	329	*
	330	* Does not change skb->protocol so this function can be used during receive.
	331	*/
	332	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb,
	333	__be16 vlan_proto, u16 vlan_tci)
	334	{
	335	int err;
	336
	337	err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
	338	if (err) {
	339	dev_kfree_skb_any(skb);
	340	return NULL;
	341	}
0b5c9db1 JP	342	return skb;
0b5c9db1 JP	343	}
1da177e4	344
0b5c9db1	345	/**
62749e2c	346	* vlan_insert_tag_set_proto - regular VLAN tag inserting
0b5c9db1	347	* @skb: skbuff to tag
62749e2c	348	* @vlan_proto: VLAN encapsulation protocol
0b5c9db1 JP	349	* @vlan_tci: VLAN TCI to insert
	350	*
	351	* Inserts the VLAN tag into @skb as part of the payload
	352	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	353	*
	354	* Following the skb_unshare() example, in case of error, the calling function
	355	* doesn't have to worry about freeing the original skb.
	356	*/
62749e2c JP	357	static inline struct sk_buff vlan_insert_tag_set_proto(struct sk_buff skb,
	358	__be16 vlan_proto,
	359	u16 vlan_tci)
0b5c9db1	360	{
86a9bad3	361	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
0b5c9db1	362	if (skb)
86a9bad3	363	skb->protocol = vlan_proto;
1da177e4 LT	364	return skb;
	365	}
	366
5968250c JP	367	/*
	368	* __vlan_hwaccel_push_inside - pushes vlan tag to the payload
	369	* @skb: skbuff to tag
	370	*
	371	* Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
	372	*
	373	* Following the skb_unshare() example, in case of error, the calling function
	374	* doesn't have to worry about freeing the original skb.
	375	*/
	376	static inline struct sk_buff __vlan_hwaccel_push_inside(struct sk_buff skb)
	377	{
	378	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
df8a39de	379	skb_vlan_tag_get(skb));
5968250c JP	380	if (likely(skb))
	381	skb->vlan_tci = 0;
	382	return skb;
	383	}
	384	/*
	385	* vlan_hwaccel_push_inside - pushes vlan tag to the payload
	386	* @skb: skbuff to tag
	387	*
	388	* Checks is tag is present in @skb->vlan_tci and if it is, it pushes the
	389	* VLAN tag from @skb->vlan_tci inside to the payload.
	390	*
	391	* Following the skb_unshare() example, in case of error, the calling function
	392	* doesn't have to worry about freeing the original skb.
	393	*/
	394	static inline struct sk_buff vlan_hwaccel_push_inside(struct sk_buff skb)
	395	{
df8a39de	396	if (skb_vlan_tag_present(skb))
5968250c JP	397	skb = __vlan_hwaccel_push_inside(skb);
	398	return skb;
	399	}
	400
1da177e4 LT	401	/**
	402	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	403	* @skb: skbuff to tag
86a9bad3	404	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	405	* @vlan_tci: VLAN TCI to insert
1da177e4	406	*
6aa895b0	407	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	408	*/
b960a0ac JP	409	static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
b960a0ac JP	410	__be16 vlan_proto, u16 vlan_tci)
1da177e4	411	{
86a9bad3	412	skb->vlan_proto = vlan_proto;
05423b24	413	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	414	}
1da177e4 LT	415
1da177e4 LT	416	/**
	417	* __vlan_get_tag - get the VLAN ID that is part of the payload
	418	* @skb: skbuff to query
f4fb874c	419	* @vlan_tci: buffer to store value
9bb8582e	420	*
1da177e4 LT	421	* Returns error if the skb is not of VLAN type
1da177e4 LT	422	*/
9bb8582e	423	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	424	{
	425	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	426
8ad227ff PM	427	if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
8ad227ff PM	428	veth->h_vlan_proto != htons(ETH_P_8021AD))
1da177e4	429	return -EINVAL;
1da177e4	430
9bb8582e	431	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	432	return 0;
	433	}
	434
	435	/**
	436	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	437	* @skb: skbuff to query
f4fb874c	438	* @vlan_tci: buffer to store value
9bb8582e	439	*
6aa895b0	440	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	441	*/
18149935	442	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	443	u16 *vlan_tci)
1da177e4	444	{
df8a39de JP	445	if (skb_vlan_tag_present(skb)) {
df8a39de JP	446	*vlan_tci = skb_vlan_tag_get(skb);
1da177e4 LT	447	return 0;
1da177e4 LT	448	} else {
9bb8582e	449	*vlan_tci = 0;
1da177e4 LT	450	return -EINVAL;
	451	}
	452	}
	453
	454	#define HAVE_VLAN_GET_TAG
	455
	456	/**
	457	* vlan_get_tag - get the VLAN ID from the skb
	458	* @skb: skbuff to query
f4fb874c	459	* @vlan_tci: buffer to store value
9bb8582e	460	*
1da177e4 LT	461	* Returns error if the skb is not VLAN tagged
1da177e4 LT	462	*/
9bb8582e	463	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4	464	{
f646968f	465	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
9bb8582e	466	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	467	} else {
9bb8582e	468	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	469	}
	470	}
	471
0a85df00 HZ	472	/**
	473	* vlan_get_protocol - get protocol EtherType.
	474	* @skb: skbuff to query
d4bcef3f TM	475	* @type: first vlan protocol
d4bcef3f TM	476	* @depth: buffer to store length of eth and vlan tags in bytes
0a85df00 HZ	477	*
	478	* Returns the EtherType of the packet, regardless of whether it is
	479	* vlan encapsulated (normal or hardware accelerated) or not.
	480	*/
d4bcef3f TM	481	static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type,
d4bcef3f TM	482	int *depth)
0a85df00	483	{
d4bcef3f TM	484	unsigned int vlan_depth = skb->mac_len;
	485
	486	/* if type is 802.1Q/AD then the header should already be
	487	* present at mac_len - VLAN_HLEN (if mac_len > 0), or at
	488	* ETH_HLEN otherwise
	489	*/
	490	if (type == htons(ETH_P_8021Q) \|\| type == htons(ETH_P_8021AD)) {
	491	if (vlan_depth) {
	492	if (WARN_ON(vlan_depth < VLAN_HLEN))
	493	return 0;
	494	vlan_depth -= VLAN_HLEN;
	495	} else {
	496	vlan_depth = ETH_HLEN;
	497	}
	498	do {
	499	struct vlan_hdr *vh;
	500
	501	if (unlikely(!pskb_may_pull(skb,
	502	vlan_depth + VLAN_HLEN)))
	503	return 0;
	504
	505	vh = (struct vlan_hdr *)(skb->data + vlan_depth);
	506	type = vh->h_vlan_encapsulated_proto;
	507	vlan_depth += VLAN_HLEN;
	508	} while (type == htons(ETH_P_8021Q) \|\|
	509	type == htons(ETH_P_8021AD));
0a85df00 HZ	510	}
0a85df00 HZ	511
d4bcef3f TM	512	if (depth)
	513	*depth = vlan_depth;
	514
	515	return type;
	516	}
	517
	518	/**
	519	* vlan_get_protocol - get protocol EtherType.
	520	* @skb: skbuff to query
	521	*
	522	* Returns the EtherType of the packet, regardless of whether it is
	523	* vlan encapsulated (normal or hardware accelerated) or not.
	524	*/
	525	static inline __be16 vlan_get_protocol(struct sk_buff *skb)
	526	{
	527	return __vlan_get_protocol(skb, skb->protocol, NULL);
0a85df00	528	}
396cf943 PS	529
	530	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	531	struct vlan_hdr *vhdr)
	532	{
	533	__be16 proto;
da8c8724	534	unsigned short *rawp;
396cf943 PS	535
	536	/*
	537	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	538	* three protocols care about.
	539	*/
	540
	541	proto = vhdr->h_vlan_encapsulated_proto;
9545b22d	542	if (eth_proto_is_802_3(proto)) {
396cf943 PS	543	skb->protocol = proto;
	544	return;
	545	}
	546
da8c8724 CW	547	rawp = (unsigned short *)(vhdr + 1);
da8c8724 CW	548	if (*rawp == 0xFFFF)
396cf943 PS	549	/*
	550	* This is a magic hack to spot IPX packets. Older Novell
	551	* breaks the protocol design and runs IPX over 802.3 without
	552	* an 802.2 LLC layer. We look for FFFF which isn't a used
	553	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	554	* but does for the rest.
	555	*/
	556	skb->protocol = htons(ETH_P_802_3);
	557	else
	558	/*
	559	* Real 802.2 LLC
	560	*/
	561	skb->protocol = htons(ETH_P_802_2);
	562	}
44a40855	563
f5a7fb88 TM	564	/**
	565	* skb_vlan_tagged - check if skb is vlan tagged.
	566	* @skb: skbuff to query
	567	*
	568	* Returns true if the skb is tagged, regardless of whether it is hardware
	569	* accelerated or not.
	570	*/
	571	static inline bool skb_vlan_tagged(const struct sk_buff *skb)
	572	{
	573	if (!skb_vlan_tag_present(skb) &&
	574	likely(skb->protocol != htons(ETH_P_8021Q) &&
	575	skb->protocol != htons(ETH_P_8021AD)))
	576	return false;
	577
	578	return true;
	579	}
	580
	581	/**
	582	* skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
	583	* @skb: skbuff to query
	584	*
	585	* Returns true if the skb is tagged with multiple vlan headers, regardless
	586	* of whether it is hardware accelerated or not.
	587	*/
	588	static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
	589	{
	590	__be16 protocol = skb->protocol;
	591
	592	if (!skb_vlan_tag_present(skb)) {
	593	struct vlan_ethhdr *veh;
	594
	595	if (likely(protocol != htons(ETH_P_8021Q) &&
	596	protocol != htons(ETH_P_8021AD)))
	597	return false;
	598
	599	veh = (struct vlan_ethhdr *)skb->data;
	600	protocol = veh->h_vlan_encapsulated_proto;
	601	}
	602
	603	if (protocol != htons(ETH_P_8021Q) && protocol != htons(ETH_P_8021AD))
	604	return false;
	605
	606	return true;
	607	}
	608
8cb65d00 TM	609	/**
	610	* vlan_features_check - drop unsafe features for skb with multiple tags.
	611	* @skb: skbuff to query
	612	* @features: features to be checked
	613	*
	614	* Returns features without unsafe ones if the skb has multiple tags.
	615	*/
	616	static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
	617	netdev_features_t features)
	618	{
	619	if (skb_vlan_tagged_multi(skb))
	620	features = netdev_intersect_features(features,
	621	NETIF_F_SG \|
	622	NETIF_F_HIGHDMA \|
	623	NETIF_F_FRAGLIST \|
	624	NETIF_F_GEN_CSUM \|
	625	NETIF_F_HW_VLAN_CTAG_TX \|
	626	NETIF_F_HW_VLAN_STAG_TX);
	627
	628	return features;
	629	}
	630
66e5133f TM	631	/**
	632	* compare_vlan_header - Compare two vlan headers
	633	* @h1: Pointer to vlan header
	634	* @h2: Pointer to vlan header
	635	*
	636	* Compare two vlan headers, returns 0 if equal.
	637	*
	638	* Please note that alignment of h1 & h2 are only guaranteed to be 16 bits.
	639	*/
	640	static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1,
	641	const struct vlan_hdr *h2)
	642	{
	643	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
	644	return (u32 )h1 ^ (u32 )h2;
	645	#else
	646	return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) \|
	647	((__force u32)h1->h_vlan_encapsulated_proto ^
	648	(__force u32)h2->h_vlan_encapsulated_proto);
	649	#endif
	650	}
1da177e4	651	#endif /* !(_LINUX_IF_VLAN_H_) */