[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_

#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;
	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;
}

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

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

#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 bool vlan_do_receive(struct sk_buff **skb);
extern struct sk_buff *vlan_untag(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 bool vlan_do_receive(struct sk_buff **skb)
{
	if ((*skb)->vlan_tci & VLAN_VID_MASK)
		(*skb)->pkt_type = PACKET_OTHERHOST;
	return false;
}

static inline struct sk_buff *vlan_untag(struct sk_buff *skb)
{
	return 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);
	}
}

/**
 * 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(const struct sk_buff *skb)
{
	__be16 protocol = 0;

	if (vlan_tx_tag_present(skb) ||
	     skb->protocol != cpu_to_be16(ETH_P_8021Q))
		protocol = skb->protocol;
	else {
		__be16 proto, *protop;
		protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
						h_vlan_encapsulated_proto),
						sizeof(proto), &proto);
		if (likely(protop))
			protocol = *protop;
	}

	return protocol;
}
#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;
1da177e4	89	struct hlist_node hlist; /* linked list */
5c15bdec	90	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
1da177e4 LT	91	struct rcu_head rcu;
	92	};
	93
f0b5a0dc	94	static inline struct net_device vlan_group_get_device(struct vlan_group vg,
9bb8582e	95	u16 vlan_id)
5c15bdec DA	96	{
	97	struct net_device **array;
	98	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
67727184	99	return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
5c15bdec DA	100	}
5c15bdec DA	101
f0b5a0dc	102	static inline void vlan_group_set_device(struct vlan_group *vg,
9bb8582e	103	u16 vlan_id,
5c15bdec DA	104	struct net_device *dev)
	105	{
	106	struct net_device **array;
	107	if (!vg)
	108	return;
	109	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	110	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
	111	}
	112
6dcbbe25 NH	113	static inline int is_vlan_dev(struct net_device *dev)
	114	{
	115	return dev->priv_flags & IFF_802_1Q_VLAN;
	116	}
	117
05423b24 ED	118	#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
05423b24 ED	119	#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
1da177e4	120
7750f403	121	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
65ac6a5f JG	122	/* Must be invoked with rcu_read_lock or with RTNL. */
	123	static inline struct net_device vlan_find_dev(struct net_device real_dev,
	124	u16 vlan_id)
	125	{
	126	struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
	127
	128	if (grp)
	129	return vlan_group_get_device(grp, vlan_id);
	130
	131	return NULL;
	132	}
	133
22d1ba74 PM	134	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	135	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
	136
7750f403	137	extern int __vlan_hwaccel_rx(struct sk_buff skb, struct vlan_group grp,
9bb8582e	138	u16 vlan_tci, int polling);
bcc6d479 JP	139	extern bool vlan_do_receive(struct sk_buff **skb);
bcc6d479 JP	140	extern struct sk_buff vlan_untag(struct sk_buff skb);
c7c4b3b6 BH	141	extern gro_result_t
	142	vlan_gro_receive(struct napi_struct napi, struct vlan_group grp,
	143	unsigned int vlan_tci, struct sk_buff *skb);
	144	extern gro_result_t
	145	vlan_gro_frags(struct napi_struct napi, struct vlan_group grp,
	146	unsigned int vlan_tci);
9b22ea56	147
7750f403	148	#else
65ac6a5f JG	149	static inline struct net_device vlan_find_dev(struct net_device real_dev,
	150	u16 vlan_id)
	151	{
	152	return NULL;
	153	}
	154
22d1ba74 PM	155	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	156	{
	157	BUG();
	158	return NULL;
	159	}
	160
	161	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	162	{
	163	BUG();
	164	return 0;
	165	}
	166
7750f403	167	static inline int __vlan_hwaccel_rx(struct sk_buff skb, struct vlan_group grp,
9bb8582e	168	u16 vlan_tci, int polling)
1da177e4	169	{
7750f403 PM	170	BUG();
7750f403 PM	171	return NET_XMIT_SUCCESS;
1da177e4	172	}
9b22ea56	173
bcc6d479	174	static inline bool vlan_do_receive(struct sk_buff **skb)
9b22ea56	175	{
0988c4c7 JG	176	if ((*skb)->vlan_tci & VLAN_VID_MASK)
0988c4c7 JG	177	(*skb)->pkt_type = PACKET_OTHERHOST;
3701e513	178	return false;
9b22ea56	179	}
e1c096e2	180
6139e75f	181	static inline struct sk_buff vlan_untag(struct sk_buff skb)
bcc6d479 JP	182	{
	183	return skb;
	184	}
	185
c7c4b3b6 BH	186	static inline gro_result_t
	187	vlan_gro_receive(struct napi_struct napi, struct vlan_group grp,
	188	unsigned int vlan_tci, struct sk_buff *skb)
e1c096e2	189	{
c7c4b3b6	190	return GRO_DROP;
e1c096e2 HX	191	}
e1c096e2 HX	192
c7c4b3b6 BH	193	static inline gro_result_t
	194	vlan_gro_frags(struct napi_struct napi, struct vlan_group grp,
	195	unsigned int vlan_tci)
e1c096e2	196	{
c7c4b3b6	197	return GRO_DROP;
e1c096e2	198	}
7750f403	199	#endif
1da177e4	200
9bb8582e PM	201	/**
	202	* vlan_hwaccel_rx - netif_rx 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_rx(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, 0);
1da177e4 LT	212	}
1da177e4 LT	213
9bb8582e PM	214	/**
	215	* vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
	216	* @skb: buffer
	217	* @grp: vlan group
	218	* @vlan_tci: VLAN TCI as received from the card
	219	*/
1da177e4 LT	220	static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
1da177e4 LT	221	struct vlan_group *grp,
9bb8582e	222	u16 vlan_tci)
1da177e4	223	{
9bb8582e	224	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1);
1da177e4 LT	225	}
	226
	227	/**
	228	* __vlan_put_tag - regular VLAN tag inserting
	229	* @skb: skbuff to tag
9bb8582e	230	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	231	*
	232	* Inserts the VLAN tag into @skb as part of the payload
	233	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
9bb8582e	234	*
1da177e4 LT	235	* Following the skb_unshare() example, in case of error, the calling function
	236	* doesn't have to worry about freeing the original skb.
	237	*/
9bb8582e	238	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	239	{
	240	struct vlan_ethhdr *veth;
	241
11a100f8 PM	242	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
	243	kfree_skb(skb);
	244	return NULL;
1da177e4	245	}
1da177e4 LT	246	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	247
	248	/* Move the mac addresses to the beginning of the new header. */
	249	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
e4dd6188	250	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	251
1da177e4 LT	252	/* first, the ethernet type */
57d3ae84	253	veth->h_vlan_proto = htons(ETH_P_8021Q);
1da177e4	254
9bb8582e PM	255	/* now, the TCI */
9bb8582e PM	256	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	257
57d3ae84	258	skb->protocol = htons(ETH_P_8021Q);
1da177e4 LT	259
	260	return skb;
	261	}
	262
	263	/**
	264	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	265	* @skb: skbuff to tag
9bb8582e	266	* @vlan_tci: VLAN TCI to insert
1da177e4	267	*
6aa895b0	268	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	269	*/
9bb8582e PM	270	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb,
9bb8582e PM	271	u16 vlan_tci)
1da177e4	272	{
05423b24	273	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	274	return skb;
	275	}
	276
	277	#define HAVE_VLAN_PUT_TAG
	278
	279	/**
	280	* vlan_put_tag - inserts VLAN tag according to device features
	281	* @skb: skbuff to tag
9bb8582e	282	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	283	*
	284	* Assumes skb->dev is the target that will xmit this frame.
	285	* Returns a VLAN tagged skb.
	286	*/
9bb8582e	287	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	288	{
1da177e4 LT	289	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	290	return __vlan_hwaccel_put_tag(skb, vlan_tci);
1da177e4	291	} else {
9bb8582e	292	return __vlan_put_tag(skb, vlan_tci);
1da177e4 LT	293	}
	294	}
	295
	296	/**
	297	* __vlan_get_tag - get the VLAN ID that is part of the payload
	298	* @skb: skbuff to query
9bb8582e PM	299	* @vlan_tci: buffer to store vlaue
9bb8582e PM	300	*
1da177e4 LT	301	* Returns error if the skb is not of VLAN type
1da177e4 LT	302	*/
9bb8582e	303	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	304	{
	305	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	306
57d3ae84	307	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
1da177e4 LT	308	return -EINVAL;
	309	}
	310
9bb8582e	311	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	312	return 0;
	313	}
	314
	315	/**
	316	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	317	* @skb: skbuff to query
9bb8582e PM	318	* @vlan_tci: buffer to store vlaue
9bb8582e PM	319	*
6aa895b0	320	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	321	*/
18149935	322	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	323	u16 *vlan_tci)
1da177e4	324	{
6aa895b0	325	if (vlan_tx_tag_present(skb)) {
05423b24	326	*vlan_tci = vlan_tx_tag_get(skb);
1da177e4 LT	327	return 0;
1da177e4 LT	328	} else {
9bb8582e	329	*vlan_tci = 0;
1da177e4 LT	330	return -EINVAL;
	331	}
	332	}
	333
	334	#define HAVE_VLAN_GET_TAG
	335
	336	/**
	337	* vlan_get_tag - get the VLAN ID from the skb
	338	* @skb: skbuff to query
9bb8582e PM	339	* @vlan_tci: buffer to store vlaue
9bb8582e PM	340	*
1da177e4 LT	341	* Returns error if the skb is not VLAN tagged
1da177e4 LT	342	*/
9bb8582e	343	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	344	{
1da177e4 LT	345	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	346	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	347	} else {
9bb8582e	348	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	349	}
	350	}
	351
0a85df00 HZ	352	/**
	353	* vlan_get_protocol - get protocol EtherType.
	354	* @skb: skbuff to query
	355	*
	356	* Returns the EtherType of the packet, regardless of whether it is
	357	* vlan encapsulated (normal or hardware accelerated) or not.
	358	*/
	359	static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
	360	{
	361	__be16 protocol = 0;
	362
	363	if (vlan_tx_tag_present(skb) \|\|
	364	skb->protocol != cpu_to_be16(ETH_P_8021Q))
	365	protocol = skb->protocol;
	366	else {
	367	__be16 proto, *protop;
	368	protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
	369	h_vlan_encapsulated_proto),
	370	sizeof(proto), &proto);
	371	if (likely(protop))
	372	protocol = *protop;
	373	}
	374
	375	return protocol;
	376	}
1da177e4 LT	377	#endif /* __KERNEL__ */
	378
	379	/* VLAN IOCTLs are found in sockios.h */
	380
	381	/* Passed in vlan_ioctl_args structure to determine behaviour. */
	382	enum vlan_ioctl_cmds {
	383	ADD_VLAN_CMD,
	384	DEL_VLAN_CMD,
	385	SET_VLAN_INGRESS_PRIORITY_CMD,
	386	SET_VLAN_EGRESS_PRIORITY_CMD,
	387	GET_VLAN_INGRESS_PRIORITY_CMD,
	388	GET_VLAN_EGRESS_PRIORITY_CMD,
	389	SET_VLAN_NAME_TYPE_CMD,
	390	SET_VLAN_FLAG_CMD,
	391	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
	392	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
	393	};
	394
a4bf3af4 PM	395	enum vlan_flags {
a4bf3af4 PM	396	VLAN_FLAG_REORDER_HDR = 0x1,
70c03b49	397	VLAN_FLAG_GVRP = 0x2,
5e756593	398	VLAN_FLAG_LOOSE_BINDING = 0x4,
a4bf3af4 PM	399	};
a4bf3af4 PM	400
1da177e4 LT	401	enum vlan_name_types {
	402	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
	403	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
	404	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
	405	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
	406	VLAN_NAME_TYPE_HIGHEST
	407	};
	408
	409	struct vlan_ioctl_args {
	410	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	411	char device1[24];
	412
	413	union {
	414	char device2[24];
	415	int VID;
	416	unsigned int skb_priority;
	417	unsigned int name_type;
	418	unsigned int bind_type;
	419	unsigned int flag; /* Matches vlan_dev_info flags */
	420	} u;
	421
	422	short vlan_qos;
	423	};
	424
	425	#endif /* !(_LINUX_IF_VLAN_H_) */