[deliverable/linux.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(const 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)
#define skb_vlan_tag_get_prio(__skb)	((__skb)->vlan_tci & VLAN_PRIO_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

/**
 * eth_type_vlan - check for valid vlan ether type.
 * @ethertype: ether type to check
 *
 * Returns true if the ether type is a vlan ether type.
 */
static inline bool eth_type_vlan(__be16 ethertype)
{
	switch (ethertype) {
	case htons(ETH_P_8021Q):
	case htons(ETH_P_8021AD):
		return true;
	default:
		return false;
	}
}

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 (!eth_type_vlan(veth->h_vlan_proto))
		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 (eth_type_vlan(type)) {
		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 (eth_type_vlan(type));
	}

	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(!eth_type_vlan(skb->protocol)))
		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(!eth_type_vlan(protocol)))
			return false;

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

	if (!eth_type_vlan(protocol))
		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_HW_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
b618aaa9	76	static inline bool is_vlan_dev(const 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)
f6a66927	84	#define skb_vlan_tag_get_prio(__skb) ((__skb)->vlan_tci & VLAN_PRIO_MASK)
1da177e4	85
e267cb96 DM	86	/**
	87	* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
	88	* @rx_packets: number of received packets
	89	* @rx_bytes: number of received bytes
	90	* @rx_multicast: number of received multicast packets
	91	* @tx_packets: number of transmitted packets
	92	* @tx_bytes: number of transmitted bytes
	93	* @syncp: synchronization point for 64bit counters
	94	* @rx_errors: number of rx errors
	95	* @tx_dropped: number of tx drops
	96	*/
	97	struct vlan_pcpu_stats {
	98	u64 rx_packets;
	99	u64 rx_bytes;
	100	u64 rx_multicast;
	101	u64 tx_packets;
	102	u64 tx_bytes;
	103	struct u64_stats_sync syncp;
	104	u32 rx_errors;
	105	u32 tx_dropped;
	106	};
	107
1e85c9b6 HFS	108	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
1e85c9b6 HFS	109
f06c7f9f	110	extern struct net_device __vlan_find_dev_deep_rcu(struct net_device real_dev,
1e85c9b6 HFS	111	__be16 vlan_proto, u16 vlan_id);
	112	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	113	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
71e415e4	114	extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
1e85c9b6 HFS	115
	116	/**
	117	* struct vlan_priority_tci_mapping - vlan egress priority mappings
	118	* @priority: skb priority
	119	* @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
	120	* @next: pointer to next struct
	121	*/
	122	struct vlan_priority_tci_mapping {
	123	u32 priority;
	124	u16 vlan_qos;
	125	struct vlan_priority_tci_mapping *next;
	126	};
	127
e267cb96 DM	128	struct proc_dir_entry;
	129	struct netpoll;
	130
	131	/**
	132	* struct vlan_dev_priv - VLAN private device data
	133	* @nr_ingress_mappings: number of ingress priority mappings
	134	* @ingress_priority_map: ingress priority mappings
	135	* @nr_egress_mappings: number of egress priority mappings
	136	* @egress_priority_map: hash of egress priority mappings
	137	* @vlan_proto: VLAN encapsulation protocol
	138	* @vlan_id: VLAN identifier
	139	* @flags: device flags
	140	* @real_dev: underlying netdevice
	141	* @real_dev_addr: address of underlying netdevice
	142	* @dent: proc dir entry
	143	* @vlan_pcpu_stats: ptr to percpu rx stats
	144	*/
	145	struct vlan_dev_priv {
	146	unsigned int nr_ingress_mappings;
	147	u32 ingress_priority_map[8];
	148	unsigned int nr_egress_mappings;
	149	struct vlan_priority_tci_mapping *egress_priority_map[16];
	150
	151	__be16 vlan_proto;
	152	u16 vlan_id;
	153	u16 flags;
	154
	155	struct net_device *real_dev;
	156	unsigned char real_dev_addr[ETH_ALEN];
	157
	158	struct proc_dir_entry *dent;
	159	struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
	160	#ifdef CONFIG_NET_POLL_CONTROLLER
	161	struct netpoll *netpoll;
	162	#endif
d38569ab	163	unsigned int nest_level;
e267cb96 DM	164	};
	165
	166	static inline struct vlan_dev_priv vlan_dev_priv(const struct net_device dev)
	167	{
	168	return netdev_priv(dev);
	169	}
	170
	171	static inline u16
	172	vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
	173	{
	174	struct vlan_priority_tci_mapping *mp;
	175
	176	smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
	177
	178	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
	179	while (mp) {
	180	if (mp->priority == skprio) {
	181	return mp->vlan_qos; /* This should already be shifted
	182	* to mask correctly with the
	183	* VLAN's TCI */
	184	}
	185	mp = mp->next;
	186	}
	187	return 0;
	188	}
	189
48cc32d3	190	extern bool vlan_do_receive(struct sk_buff **skb);
9b22ea56	191
80d5c368 PM	192	extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
80d5c368 PM	193	extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
87002b03	194
348a1443 JP	195	extern int vlan_vids_add_by_dev(struct net_device *dev,
	196	const struct net_device *by_dev);
	197	extern void vlan_vids_del_by_dev(struct net_device *dev,
	198	const struct net_device *by_dev);
9b361c13 JP	199
9b361c13 JP	200	extern bool vlan_uses_dev(const struct net_device *dev);
e1618d46 VY	201
	202	static inline int vlan_get_encap_level(struct net_device *dev)
	203	{
	204	BUG_ON(!is_vlan_dev(dev));
	205	return vlan_dev_priv(dev)->nest_level;
	206	}
7750f403	207	#else
cec9c133	208	static inline struct net_device *
f06c7f9f	209	__vlan_find_dev_deep_rcu(struct net_device *real_dev,
9fae27b3	210	__be16 vlan_proto, u16 vlan_id)
cec9c133 JP	211	{
	212	return NULL;
	213	}
	214
22d1ba74 PM	215	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	216	{
	217	BUG();
	218	return NULL;
	219	}
	220
	221	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	222	{
	223	BUG();
	224	return 0;
	225	}
	226
71e415e4	227	static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
	228	{
	229	BUG();
	230	return 0;
	231	}
	232
d3243539 EP	233	static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
	234	u32 skprio)
	235	{
	236	return 0;
	237	}
	238
48cc32d3	239	static inline bool vlan_do_receive(struct sk_buff **skb)
9b22ea56	240	{
3701e513	241	return false;
9b22ea56	242	}
e1c096e2	243
9fae27b3	244	static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
87002b03 JP	245	{
	246	return 0;
	247	}
	248
9fae27b3	249	static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
87002b03 JP	250	{
87002b03 JP	251	}
348a1443 JP	252
	253	static inline int vlan_vids_add_by_dev(struct net_device *dev,
	254	const struct net_device *by_dev)
	255	{
	256	return 0;
	257	}
	258
	259	static inline void vlan_vids_del_by_dev(struct net_device *dev,
	260	const struct net_device *by_dev)
	261	{
	262	}
9b361c13 JP	263
	264	static inline bool vlan_uses_dev(const struct net_device *dev)
	265	{
	266	return false;
	267	}
e1618d46 VY	268	static inline int vlan_get_encap_level(struct net_device *dev)
	269	{
	270	BUG();
	271	return 0;
	272	}
7750f403	273	#endif
1da177e4	274
fe19c4f9 EG	275	/**
	276	* eth_type_vlan - check for valid vlan ether type.
	277	* @ethertype: ether type to check
	278	*
	279	* Returns true if the ether type is a vlan ether type.
	280	*/
	281	static inline bool eth_type_vlan(__be16 ethertype)
	282	{
	283	switch (ethertype) {
	284	case htons(ETH_P_8021Q):
	285	case htons(ETH_P_8021AD):
	286	return true;
	287	default:
	288	return false;
	289	}
	290	}
	291
86a9bad3 PM	292	static inline bool vlan_hw_offload_capable(netdev_features_t features,
	293	__be16 proto)
	294	{
	295	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
	296	return true;
8ad227ff PM	297	if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
8ad227ff PM	298	return true;
86a9bad3 PM	299	return false;
	300	}
	301
1da177e4	302	/**
15255a43	303	* __vlan_insert_tag - regular VLAN tag inserting
1da177e4	304	* @skb: skbuff to tag
86a9bad3	305	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	306	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	307	*
1da177e4 LT	308	* Inserts the VLAN tag into @skb as part of the payload
15255a43	309	* Returns error if skb_cow_head failes.
0b5c9db1 JP	310	*
0b5c9db1 JP	311	* Does not change skb->protocol so this function can be used during receive.
1da177e4	312	*/
15255a43 JP	313	static inline int __vlan_insert_tag(struct sk_buff *skb,
15255a43 JP	314	__be16 vlan_proto, u16 vlan_tci)
1da177e4 LT	315	{
	316	struct vlan_ethhdr *veth;
	317
15255a43 JP	318	if (skb_cow_head(skb, VLAN_HLEN) < 0)
	319	return -ENOMEM;
	320
1da177e4 LT	321	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	322
	323	/* Move the mac addresses to the beginning of the new header. */
a3f671b3	324	memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
e4dd6188	325	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	326
1da177e4 LT	327	/* first, the ethernet type */
86a9bad3	328	veth->h_vlan_proto = vlan_proto;
1da177e4	329
9bb8582e PM	330	/* now, the TCI */
9bb8582e PM	331	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	332
15255a43 JP	333	return 0;
	334	}
	335
	336	/**
	337	* vlan_insert_tag - regular VLAN tag inserting
	338	* @skb: skbuff to tag
	339	* @vlan_proto: VLAN encapsulation protocol
	340	* @vlan_tci: VLAN TCI to insert
	341	*
	342	* Inserts the VLAN tag into @skb as part of the payload
	343	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	344	*
	345	* Following the skb_unshare() example, in case of error, the calling function
	346	* doesn't have to worry about freeing the original skb.
	347	*
	348	* Does not change skb->protocol so this function can be used during receive.
	349	*/
	350	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb,
	351	__be16 vlan_proto, u16 vlan_tci)
	352	{
	353	int err;
	354
	355	err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
	356	if (err) {
	357	dev_kfree_skb_any(skb);
	358	return NULL;
	359	}
0b5c9db1 JP	360	return skb;
0b5c9db1 JP	361	}
1da177e4	362
0b5c9db1	363	/**
62749e2c	364	* vlan_insert_tag_set_proto - regular VLAN tag inserting
0b5c9db1	365	* @skb: skbuff to tag
62749e2c	366	* @vlan_proto: VLAN encapsulation protocol
0b5c9db1 JP	367	* @vlan_tci: VLAN TCI to insert
	368	*
	369	* Inserts the VLAN tag into @skb as part of the payload
	370	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	371	*
	372	* Following the skb_unshare() example, in case of error, the calling function
	373	* doesn't have to worry about freeing the original skb.
	374	*/
62749e2c JP	375	static inline struct sk_buff vlan_insert_tag_set_proto(struct sk_buff skb,
	376	__be16 vlan_proto,
	377	u16 vlan_tci)
0b5c9db1	378	{
86a9bad3	379	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
0b5c9db1	380	if (skb)
86a9bad3	381	skb->protocol = vlan_proto;
1da177e4 LT	382	return skb;
	383	}
	384
5968250c JP	385	/*
	386	* __vlan_hwaccel_push_inside - pushes vlan tag to the payload
	387	* @skb: skbuff to tag
	388	*
	389	* Pushes the 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	{
	396	skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
df8a39de	397	skb_vlan_tag_get(skb));
5968250c JP	398	if (likely(skb))
	399	skb->vlan_tci = 0;
	400	return skb;
	401	}
	402	/*
	403	* vlan_hwaccel_push_inside - pushes vlan tag to the payload
	404	* @skb: skbuff to tag
	405	*
	406	* Checks is tag is present in @skb->vlan_tci and if it is, it pushes the
	407	* VLAN tag from @skb->vlan_tci inside to the payload.
	408	*
	409	* Following the skb_unshare() example, in case of error, the calling function
	410	* doesn't have to worry about freeing the original skb.
	411	*/
	412	static inline struct sk_buff vlan_hwaccel_push_inside(struct sk_buff skb)
	413	{
df8a39de	414	if (skb_vlan_tag_present(skb))
5968250c JP	415	skb = __vlan_hwaccel_push_inside(skb);
	416	return skb;
	417	}
	418
1da177e4 LT	419	/**
	420	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	421	* @skb: skbuff to tag
86a9bad3	422	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	423	* @vlan_tci: VLAN TCI to insert
1da177e4	424	*
6aa895b0	425	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	426	*/
b960a0ac JP	427	static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
b960a0ac JP	428	__be16 vlan_proto, u16 vlan_tci)
1da177e4	429	{
86a9bad3	430	skb->vlan_proto = vlan_proto;
05423b24	431	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	432	}
1da177e4 LT	433
1da177e4 LT	434	/**
	435	* __vlan_get_tag - get the VLAN ID that is part of the payload
	436	* @skb: skbuff to query
f4fb874c	437	* @vlan_tci: buffer to store value
9bb8582e	438	*
1da177e4 LT	439	* Returns error if the skb is not of VLAN type
1da177e4 LT	440	*/
9bb8582e	441	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	442	{
	443	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	444
fe19c4f9	445	if (!eth_type_vlan(veth->h_vlan_proto))
1da177e4	446	return -EINVAL;
1da177e4	447
9bb8582e	448	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	449	return 0;
	450	}
	451
	452	/**
	453	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	454	* @skb: skbuff to query
f4fb874c	455	* @vlan_tci: buffer to store value
9bb8582e	456	*
6aa895b0	457	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	458	*/
18149935	459	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	460	u16 *vlan_tci)
1da177e4	461	{
df8a39de JP	462	if (skb_vlan_tag_present(skb)) {
df8a39de JP	463	*vlan_tci = skb_vlan_tag_get(skb);
1da177e4 LT	464	return 0;
1da177e4 LT	465	} else {
9bb8582e	466	*vlan_tci = 0;
1da177e4 LT	467	return -EINVAL;
	468	}
	469	}
	470
	471	#define HAVE_VLAN_GET_TAG
	472
	473	/**
	474	* vlan_get_tag - get the VLAN ID from the skb
	475	* @skb: skbuff to query
f4fb874c	476	* @vlan_tci: buffer to store value
9bb8582e	477	*
1da177e4 LT	478	* Returns error if the skb is not VLAN tagged
1da177e4 LT	479	*/
9bb8582e	480	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4	481	{
f646968f	482	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
9bb8582e	483	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	484	} else {
9bb8582e	485	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	486	}
	487	}
	488
0a85df00 HZ	489	/**
	490	* vlan_get_protocol - get protocol EtherType.
	491	* @skb: skbuff to query
d4bcef3f TM	492	* @type: first vlan protocol
d4bcef3f TM	493	* @depth: buffer to store length of eth and vlan tags in bytes
0a85df00 HZ	494	*
	495	* Returns the EtherType of the packet, regardless of whether it is
	496	* vlan encapsulated (normal or hardware accelerated) or not.
	497	*/
d4bcef3f TM	498	static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type,
d4bcef3f TM	499	int *depth)
0a85df00	500	{
d4bcef3f TM	501	unsigned int vlan_depth = skb->mac_len;
	502
	503	/* if type is 802.1Q/AD then the header should already be
	504	* present at mac_len - VLAN_HLEN (if mac_len > 0), or at
	505	* ETH_HLEN otherwise
	506	*/
fe19c4f9	507	if (eth_type_vlan(type)) {
d4bcef3f TM	508	if (vlan_depth) {
	509	if (WARN_ON(vlan_depth < VLAN_HLEN))
	510	return 0;
	511	vlan_depth -= VLAN_HLEN;
	512	} else {
	513	vlan_depth = ETH_HLEN;
	514	}
	515	do {
	516	struct vlan_hdr *vh;
	517
	518	if (unlikely(!pskb_may_pull(skb,
	519	vlan_depth + VLAN_HLEN)))
	520	return 0;
	521
	522	vh = (struct vlan_hdr *)(skb->data + vlan_depth);
	523	type = vh->h_vlan_encapsulated_proto;
	524	vlan_depth += VLAN_HLEN;
fe19c4f9	525	} while (eth_type_vlan(type));
0a85df00 HZ	526	}
0a85df00 HZ	527
d4bcef3f TM	528	if (depth)
	529	*depth = vlan_depth;
	530
	531	return type;
	532	}
	533
	534	/**
	535	* vlan_get_protocol - get protocol EtherType.
	536	* @skb: skbuff to query
	537	*
	538	* Returns the EtherType of the packet, regardless of whether it is
	539	* vlan encapsulated (normal or hardware accelerated) or not.
	540	*/
	541	static inline __be16 vlan_get_protocol(struct sk_buff *skb)
	542	{
	543	return __vlan_get_protocol(skb, skb->protocol, NULL);
0a85df00	544	}
396cf943 PS	545
	546	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	547	struct vlan_hdr *vhdr)
	548	{
	549	__be16 proto;
da8c8724	550	unsigned short *rawp;
396cf943 PS	551
	552	/*
	553	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	554	* three protocols care about.
	555	*/
	556
	557	proto = vhdr->h_vlan_encapsulated_proto;
9545b22d	558	if (eth_proto_is_802_3(proto)) {
396cf943 PS	559	skb->protocol = proto;
	560	return;
	561	}
	562
da8c8724 CW	563	rawp = (unsigned short *)(vhdr + 1);
da8c8724 CW	564	if (*rawp == 0xFFFF)
396cf943 PS	565	/*
	566	* This is a magic hack to spot IPX packets. Older Novell
	567	* breaks the protocol design and runs IPX over 802.3 without
	568	* an 802.2 LLC layer. We look for FFFF which isn't a used
	569	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	570	* but does for the rest.
	571	*/
	572	skb->protocol = htons(ETH_P_802_3);
	573	else
	574	/*
	575	* Real 802.2 LLC
	576	*/
	577	skb->protocol = htons(ETH_P_802_2);
	578	}
44a40855	579
f5a7fb88 TM	580	/**
	581	* skb_vlan_tagged - check if skb is vlan tagged.
	582	* @skb: skbuff to query
	583	*
	584	* Returns true if the skb is tagged, regardless of whether it is hardware
	585	* accelerated or not.
	586	*/
	587	static inline bool skb_vlan_tagged(const struct sk_buff *skb)
	588	{
	589	if (!skb_vlan_tag_present(skb) &&
fe19c4f9	590	likely(!eth_type_vlan(skb->protocol)))
f5a7fb88 TM	591	return false;
	592
	593	return true;
	594	}
	595
	596	/**
	597	* skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
	598	* @skb: skbuff to query
	599	*
	600	* Returns true if the skb is tagged with multiple vlan headers, regardless
	601	* of whether it is hardware accelerated or not.
	602	*/
	603	static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
	604	{
	605	__be16 protocol = skb->protocol;
	606
	607	if (!skb_vlan_tag_present(skb)) {
	608	struct vlan_ethhdr *veh;
	609
fe19c4f9	610	if (likely(!eth_type_vlan(protocol)))
f5a7fb88 TM	611	return false;
	612
	613	veh = (struct vlan_ethhdr *)skb->data;
	614	protocol = veh->h_vlan_encapsulated_proto;
	615	}
	616
fe19c4f9	617	if (!eth_type_vlan(protocol))
f5a7fb88 TM	618	return false;
	619
	620	return true;
	621	}
	622
8cb65d00 TM	623	/**
	624	* vlan_features_check - drop unsafe features for skb with multiple tags.
	625	* @skb: skbuff to query
	626	* @features: features to be checked
	627	*
	628	* Returns features without unsafe ones if the skb has multiple tags.
	629	*/
	630	static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
	631	netdev_features_t features)
	632	{
	633	if (skb_vlan_tagged_multi(skb))
	634	features = netdev_intersect_features(features,
	635	NETIF_F_SG \|
	636	NETIF_F_HIGHDMA \|
	637	NETIF_F_FRAGLIST \|
c8cd0989	638	NETIF_F_HW_CSUM \|
8cb65d00 TM	639	NETIF_F_HW_VLAN_CTAG_TX \|
	640	NETIF_F_HW_VLAN_STAG_TX);
	641
	642	return features;
	643	}
	644
66e5133f TM	645	/**
	646	* compare_vlan_header - Compare two vlan headers
	647	* @h1: Pointer to vlan header
	648	* @h2: Pointer to vlan header
	649	*
	650	* Compare two vlan headers, returns 0 if equal.
	651	*
	652	* Please note that alignment of h1 & h2 are only guaranteed to be 16 bits.
	653	*/
	654	static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1,
	655	const struct vlan_hdr *h2)
	656	{
	657	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
	658	return (u32 )h1 ^ (u32 )h2;
	659	#else
	660	return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) \|
	661	((__force u32)h1->h_vlan_encapsulated_proto ^
	662	(__force u32)h2->h_vlan_encapsulated_proto);
	663	#endif
	664	}
1da177e4	665	#endif /* !(_LINUX_IF_VLAN_H_) */