[mirror_ubuntu-artful-kernel.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_

#ifdef __KERNEL__
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>

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

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

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

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

#include <linux/skbuff.h>

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

#define VLAN_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 *));

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

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

static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
						       u16 vlan_id)
{
	struct net_device **array;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
}

static inline void vlan_group_set_device(struct vlan_group *vg,
					 u16 vlan_id,
					 struct net_device *dev)
{
	struct net_device **array;
	if (!vg)
		return;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
}

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

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
/* Must be invoked with rcu_read_lock or with RTNL. */
static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
					       u16 vlan_id)
{
	struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);

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

	return NULL;
}

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 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
			     u16 vlan_tci, int polling);
extern void vlan_hwaccel_do_receive(struct sk_buff *skb);
extern gro_result_t
vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
		 unsigned int vlan_tci, struct sk_buff *skb);
extern gro_result_t
vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
	       unsigned int vlan_tci);

#else
static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
					       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 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
				    u16 vlan_tci, int polling)
{
	BUG();
	return NET_XMIT_SUCCESS;
}

static inline void vlan_hwaccel_do_receive(struct sk_buff *skb)
{
}

static inline gro_result_t
vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
		 unsigned int vlan_tci, struct sk_buff *skb)
{
	return GRO_DROP;
}

static inline gro_result_t
vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
	       unsigned int vlan_tci)
{
	return GRO_DROP;
}
#endif

/**
 * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
 * @skb: buffer
 * @grp: vlan group
 * @vlan_tci: VLAN TCI as received from the card
 */
static inline int vlan_hwaccel_rx(struct sk_buff *skb,
				  struct vlan_group *grp,
				  u16 vlan_tci)
{
	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0);
}

/**
 * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
 * @skb: buffer
 * @grp: vlan group
 * @vlan_tci: VLAN TCI as received from the card
 */
static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
					   struct vlan_group *grp,
					   u16 vlan_tci)
{
	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1);
}

/**
 * __vlan_put_tag - regular VLAN tag inserting
 * @skb: skbuff to tag
 * @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_put_tag(struct sk_buff *skb, u16 vlan_tci)
{
	struct vlan_ethhdr *veth;

	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
		kfree_skb(skb);
		return NULL;
	}
	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);

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

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

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

	skb->protocol = htons(ETH_P_8021Q);

	return skb;
}

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

#define HAVE_VLAN_PUT_TAG

/**
 * vlan_put_tag - inserts VLAN tag according to device features
 * @skb: skbuff to tag
 * @vlan_tci: VLAN TCI to insert
 *
 * Assumes skb->dev is the target that will xmit this frame.
 * Returns a VLAN tagged skb.
 */
static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
		return __vlan_hwaccel_put_tag(skb, vlan_tci);
	} else {
		return __vlan_put_tag(skb, 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)) {
		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_TX) {
		return __vlan_hwaccel_get_tag(skb, vlan_tci);
	} else {
		return __vlan_get_tag(skb, vlan_tci);
	}
}

#endif /* __KERNEL__ */

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

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

enum vlan_flags {
	VLAN_FLAG_REORDER_HDR	= 0x1,
	VLAN_FLAG_GVRP		= 0x2,
	VLAN_FLAG_LOOSE_BINDING	= 0x4,
};

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

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

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

	short vlan_qos;   
};

#endif /* !(_LINUX_IF_VLAN_H_) */
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	*/
	12
	13	#ifndef _LINUX_IF_VLAN_H_
	14	#define _LINUX_IF_VLAN_H_
	15
	16	#ifdef __KERNEL__
1da177e4	17	#include <linux/netdevice.h>
0610d11b	18	#include <linux/etherdevice.h>
65ac6a5f	19	#include <linux/rtnetlink.h>
1da177e4 LT	20
	21	#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
	22	* that VLAN requires.
	23	*/
	24	#define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
	25	#define VLAN_ETH_HLEN 18 /* Total octets in header. */
	26	#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
	27
	28	/*
	29	* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
	30	*/
	31	#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
	32	#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
	33
740c15d0 PM	34	/*
	35	* struct vlan_hdr - vlan header
	36	* @h_vlan_TCI: priority and VLAN ID
	37	* @h_vlan_encapsulated_proto: packet type ID or len
	38	*/
	39	struct vlan_hdr {
	40	__be16 h_vlan_TCI;
	41	__be16 h_vlan_encapsulated_proto;
	42	};
	43
	44	/**
	45	* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
	46	* @h_dest: destination ethernet address
	47	* @h_source: source ethernet address
	48	* @h_vlan_proto: ethernet protocol (always 0x8100)
	49	* @h_vlan_TCI: priority and VLAN ID
	50	* @h_vlan_encapsulated_proto: packet type ID or len
	51	*/
1da177e4	52	struct vlan_ethhdr {
740c15d0 PM	53	unsigned char h_dest[ETH_ALEN];
	54	unsigned char h_source[ETH_ALEN];
	55	__be16 h_vlan_proto;
	56	__be16 h_vlan_TCI;
	57	__be16 h_vlan_encapsulated_proto;
1da177e4 LT	58	};
	59
	60	#include <linux/skbuff.h>
	61
	62	static inline struct vlan_ethhdr vlan_eth_hdr(const struct sk_buff skb)
	63	{
98e399f8	64	return (struct vlan_ethhdr *)skb_mac_header(skb);
1da177e4 LT	65	}
1da177e4 LT	66
05423b24 ED	67	#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
	68	#define VLAN_PRIO_SHIFT 13
	69	#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
	70	#define VLAN_TAG_PRESENT VLAN_CFI_MASK
	71	#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
b738127d	72	#define VLAN_N_VID 4096
1da177e4 LT	73
1da177e4 LT	74	/* found in socket.c */
881d966b	75	extern void vlan_ioctl_set(int (hook)(struct net , void __user *));
1da177e4	76
1da177e4 LT	77	/* if this changes, algorithm will have to be reworked because this
	78	* depends on completely exhausting the VLAN identifier space. Thus
	79	* it gives constant time look-up, but in many cases it wastes memory.
	80	*/
5c15bdec	81	#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
b738127d	82	#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
1da177e4 LT	83
1da177e4 LT	84	struct vlan_group {
a9fde260 PE	85	struct net_device real_dev; / The ethernet(like) device
	86	* the vlan is attached to.
	87	*/
af301517	88	unsigned int nr_vlans;
63c8099d	89	int killall;
1da177e4	90	struct hlist_node hlist; /* linked list */
5c15bdec	91	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
1da177e4 LT	92	struct rcu_head rcu;
	93	};
	94
f0b5a0dc	95	static inline struct net_device vlan_group_get_device(struct vlan_group vg,
9bb8582e	96	u16 vlan_id)
5c15bdec DA	97	{
	98	struct net_device **array;
	99	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
67727184	100	return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
5c15bdec DA	101	}
5c15bdec DA	102
f0b5a0dc	103	static inline void vlan_group_set_device(struct vlan_group *vg,
9bb8582e	104	u16 vlan_id,
5c15bdec DA	105	struct net_device *dev)
	106	{
	107	struct net_device **array;
	108	if (!vg)
	109	return;
	110	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	111	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
	112	}
	113
05423b24 ED	114	#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
05423b24 ED	115	#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
1da177e4	116
7750f403	117	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
65ac6a5f JG	118	/* Must be invoked with rcu_read_lock or with RTNL. */
	119	static inline struct net_device vlan_find_dev(struct net_device real_dev,
	120	u16 vlan_id)
	121	{
	122	struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
	123
	124	if (grp)
	125	return vlan_group_get_device(grp, vlan_id);
	126
	127	return NULL;
	128	}
	129
22d1ba74 PM	130	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	131	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
	132
7750f403	133	extern int __vlan_hwaccel_rx(struct sk_buff skb, struct vlan_group grp,
9bb8582e	134	u16 vlan_tci, int polling);
05532121	135	extern void vlan_hwaccel_do_receive(struct sk_buff *skb);
c7c4b3b6 BH	136	extern gro_result_t
	137	vlan_gro_receive(struct napi_struct napi, struct vlan_group grp,
	138	unsigned int vlan_tci, struct sk_buff *skb);
	139	extern gro_result_t
	140	vlan_gro_frags(struct napi_struct napi, struct vlan_group grp,
	141	unsigned int vlan_tci);
9b22ea56	142
7750f403	143	#else
65ac6a5f JG	144	static inline struct net_device vlan_find_dev(struct net_device real_dev,
	145	u16 vlan_id)
	146	{
	147	return NULL;
	148	}
	149
22d1ba74 PM	150	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	151	{
	152	BUG();
	153	return NULL;
	154	}
	155
	156	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	157	{
	158	BUG();
	159	return 0;
	160	}
	161
7750f403	162	static inline int __vlan_hwaccel_rx(struct sk_buff skb, struct vlan_group grp,
9bb8582e	163	u16 vlan_tci, int polling)
1da177e4	164	{
7750f403 PM	165	BUG();
7750f403 PM	166	return NET_XMIT_SUCCESS;
1da177e4	167	}
9b22ea56	168
05532121	169	static inline void vlan_hwaccel_do_receive(struct sk_buff *skb)
9b22ea56	170	{
9b22ea56	171	}
e1c096e2	172
c7c4b3b6 BH	173	static inline gro_result_t
	174	vlan_gro_receive(struct napi_struct napi, struct vlan_group grp,
	175	unsigned int vlan_tci, struct sk_buff *skb)
e1c096e2	176	{
c7c4b3b6	177	return GRO_DROP;
e1c096e2 HX	178	}
e1c096e2 HX	179
c7c4b3b6 BH	180	static inline gro_result_t
	181	vlan_gro_frags(struct napi_struct napi, struct vlan_group grp,
	182	unsigned int vlan_tci)
e1c096e2	183	{
c7c4b3b6	184	return GRO_DROP;
e1c096e2	185	}
7750f403	186	#endif
1da177e4	187
9bb8582e PM	188	/**
	189	* vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
	190	* @skb: buffer
	191	* @grp: vlan group
	192	* @vlan_tci: VLAN TCI as received from the card
	193	*/
1da177e4 LT	194	static inline int vlan_hwaccel_rx(struct sk_buff *skb,
1da177e4 LT	195	struct vlan_group *grp,
9bb8582e	196	u16 vlan_tci)
1da177e4	197	{
9bb8582e	198	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0);
1da177e4 LT	199	}
1da177e4 LT	200
9bb8582e PM	201	/**
	202	* vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
	203	* @skb: buffer
	204	* @grp: vlan group
	205	* @vlan_tci: VLAN TCI as received from the card
	206	*/
1da177e4 LT	207	static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
1da177e4 LT	208	struct vlan_group *grp,
9bb8582e	209	u16 vlan_tci)
1da177e4	210	{
9bb8582e	211	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1);
1da177e4 LT	212	}
	213
	214	/**
	215	* __vlan_put_tag - regular VLAN tag inserting
	216	* @skb: skbuff to tag
9bb8582e	217	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	218	*
	219	* Inserts the VLAN tag into @skb as part of the payload
	220	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
9bb8582e	221	*
1da177e4 LT	222	* Following the skb_unshare() example, in case of error, the calling function
	223	* doesn't have to worry about freeing the original skb.
	224	*/
9bb8582e	225	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	226	{
	227	struct vlan_ethhdr *veth;
	228
11a100f8 PM	229	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
	230	kfree_skb(skb);
	231	return NULL;
1da177e4	232	}
1da177e4 LT	233	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	234
	235	/* Move the mac addresses to the beginning of the new header. */
	236	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
e4dd6188	237	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	238
1da177e4 LT	239	/* first, the ethernet type */
57d3ae84	240	veth->h_vlan_proto = htons(ETH_P_8021Q);
1da177e4	241
9bb8582e PM	242	/* now, the TCI */
9bb8582e PM	243	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	244
57d3ae84	245	skb->protocol = htons(ETH_P_8021Q);
1da177e4 LT	246
	247	return skb;
	248	}
	249
	250	/**
	251	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	252	* @skb: skbuff to tag
9bb8582e	253	* @vlan_tci: VLAN TCI to insert
1da177e4	254	*
6aa895b0	255	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	256	*/
9bb8582e PM	257	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb,
9bb8582e PM	258	u16 vlan_tci)
1da177e4	259	{
05423b24	260	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	261	return skb;
	262	}
	263
	264	#define HAVE_VLAN_PUT_TAG
	265
	266	/**
	267	* vlan_put_tag - inserts VLAN tag according to device features
	268	* @skb: skbuff to tag
9bb8582e	269	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	270	*
	271	* Assumes skb->dev is the target that will xmit this frame.
	272	* Returns a VLAN tagged skb.
	273	*/
9bb8582e	274	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	275	{
1da177e4 LT	276	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	277	return __vlan_hwaccel_put_tag(skb, vlan_tci);
1da177e4	278	} else {
9bb8582e	279	return __vlan_put_tag(skb, vlan_tci);
1da177e4 LT	280	}
	281	}
	282
	283	/**
	284	* __vlan_get_tag - get the VLAN ID that is part of the payload
	285	* @skb: skbuff to query
9bb8582e PM	286	* @vlan_tci: buffer to store vlaue
9bb8582e PM	287	*
1da177e4 LT	288	* Returns error if the skb is not of VLAN type
1da177e4 LT	289	*/
9bb8582e	290	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	291	{
	292	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	293
57d3ae84	294	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
1da177e4 LT	295	return -EINVAL;
	296	}
	297
9bb8582e	298	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	299	return 0;
	300	}
	301
	302	/**
	303	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	304	* @skb: skbuff to query
9bb8582e PM	305	* @vlan_tci: buffer to store vlaue
9bb8582e PM	306	*
6aa895b0	307	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	308	*/
18149935	309	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	310	u16 *vlan_tci)
1da177e4	311	{
6aa895b0	312	if (vlan_tx_tag_present(skb)) {
05423b24	313	*vlan_tci = vlan_tx_tag_get(skb);
1da177e4 LT	314	return 0;
1da177e4 LT	315	} else {
9bb8582e	316	*vlan_tci = 0;
1da177e4 LT	317	return -EINVAL;
	318	}
	319	}
	320
	321	#define HAVE_VLAN_GET_TAG
	322
	323	/**
	324	* vlan_get_tag - get the VLAN ID from the skb
	325	* @skb: skbuff to query
9bb8582e PM	326	* @vlan_tci: buffer to store vlaue
9bb8582e PM	327	*
1da177e4 LT	328	* Returns error if the skb is not VLAN tagged
1da177e4 LT	329	*/
9bb8582e	330	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	331	{
1da177e4 LT	332	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	333	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	334	} else {
9bb8582e	335	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	336	}
	337	}
	338
	339	#endif /* __KERNEL__ */
	340
	341	/* VLAN IOCTLs are found in sockios.h */
	342
	343	/* Passed in vlan_ioctl_args structure to determine behaviour. */
	344	enum vlan_ioctl_cmds {
	345	ADD_VLAN_CMD,
	346	DEL_VLAN_CMD,
	347	SET_VLAN_INGRESS_PRIORITY_CMD,
	348	SET_VLAN_EGRESS_PRIORITY_CMD,
	349	GET_VLAN_INGRESS_PRIORITY_CMD,
	350	GET_VLAN_EGRESS_PRIORITY_CMD,
	351	SET_VLAN_NAME_TYPE_CMD,
	352	SET_VLAN_FLAG_CMD,
	353	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
	354	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
	355	};
	356
a4bf3af4 PM	357	enum vlan_flags {
a4bf3af4 PM	358	VLAN_FLAG_REORDER_HDR = 0x1,
70c03b49	359	VLAN_FLAG_GVRP = 0x2,
5e756593	360	VLAN_FLAG_LOOSE_BINDING = 0x4,
a4bf3af4 PM	361	};
a4bf3af4 PM	362
1da177e4 LT	363	enum vlan_name_types {
	364	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
	365	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
	366	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
	367	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
	368	VLAN_NAME_TYPE_HIGHEST
	369	};
	370
	371	struct vlan_ioctl_args {
	372	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	373	char device1[24];
	374
	375	union {
	376	char device2[24];
	377	int VID;
	378	unsigned int skb_priority;
	379	unsigned int name_type;
	380	unsigned int bind_type;
	381	unsigned int flag; /* Matches vlan_dev_info flags */
	382	} u;
	383
	384	short vlan_qos;
	385	};
	386
	387	#endif /* !(_LINUX_IF_VLAN_H_) */