[linux-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_

#ifdef __KERNEL__
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/bug.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 *));

struct vlan_info;

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)

extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
					       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 bool vlan_do_receive(struct sk_buff **skb, bool last_handler);
extern struct sk_buff *vlan_untag(struct sk_buff *skb);

extern int vlan_vid_add(struct net_device *dev, unsigned short vid);
extern void vlan_vid_del(struct net_device *dev, unsigned short 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);
#else
static inline struct net_device *
__vlan_find_dev_deep(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 bool vlan_do_receive(struct sk_buff **skb, bool last_handler)
{
	if (((*skb)->vlan_tci & VLAN_VID_MASK) && last_handler)
		(*skb)->pkt_type = PACKET_OTHERHOST;
	return false;
}

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

static inline int vlan_vid_add(struct net_device *dev, unsigned short vid)
{
	return 0;
}

static inline void vlan_vid_del(struct net_device *dev, unsigned short 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)
{
}
#endif

/**
 * vlan_insert_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.
 *
 * 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, 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);

	return skb;
}

/**
 * __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)
{
	skb = vlan_insert_tag(skb, vlan_tci);
	if (skb)
		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;
}

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

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

	proto = vhdr->h_vlan_encapsulated_proto;
	if (ntohs(proto) >= 1536) {
		skb->protocol = proto;
		return;
	}

	rawp = skb->data;
	if (*(unsigned short *) rawp == 0xFFFF)
		/*
		 * This is a magic hack to spot IPX packets. Older Novell
		 * breaks the protocol design and runs IPX over 802.3 without
		 * an 802.2 LLC layer. We look for FFFF which isn't a used
		 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
		 * but does for the rest.
		 */
		skb->protocol = htons(ETH_P_802_3);
	else
		/*
		 * Real 802.2 LLC
		 */
		skb->protocol = htons(ETH_P_802_2);
}
#endif /* __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_priv 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>
187f1882	20	#include <linux/bug.h>
1da177e4 LT	21
	22	#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
	23	* that VLAN requires.
	24	*/
	25	#define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
	26	#define VLAN_ETH_HLEN 18 /* Total octets in header. */
	27	#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
	28
	29	/*
	30	* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
	31	*/
	32	#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
	33	#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
	34
740c15d0 PM	35	/*
	36	* struct vlan_hdr - vlan header
	37	* @h_vlan_TCI: priority and VLAN ID
	38	* @h_vlan_encapsulated_proto: packet type ID or len
	39	*/
	40	struct vlan_hdr {
	41	__be16 h_vlan_TCI;
	42	__be16 h_vlan_encapsulated_proto;
	43	};
	44
	45	/**
	46	* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
	47	* @h_dest: destination ethernet address
	48	* @h_source: source ethernet address
	49	* @h_vlan_proto: ethernet protocol (always 0x8100)
	50	* @h_vlan_TCI: priority and VLAN ID
	51	* @h_vlan_encapsulated_proto: packet type ID or len
	52	*/
1da177e4	53	struct vlan_ethhdr {
740c15d0 PM	54	unsigned char h_dest[ETH_ALEN];
	55	unsigned char h_source[ETH_ALEN];
	56	__be16 h_vlan_proto;
	57	__be16 h_vlan_TCI;
	58	__be16 h_vlan_encapsulated_proto;
1da177e4 LT	59	};
	60
	61	#include <linux/skbuff.h>
	62
	63	static inline struct vlan_ethhdr vlan_eth_hdr(const struct sk_buff skb)
	64	{
98e399f8	65	return (struct vlan_ethhdr *)skb_mac_header(skb);
1da177e4 LT	66	}
1da177e4 LT	67
05423b24 ED	68	#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
	69	#define VLAN_PRIO_SHIFT 13
	70	#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
	71	#define VLAN_TAG_PRESENT VLAN_CFI_MASK
	72	#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
b738127d	73	#define VLAN_N_VID 4096
1da177e4 LT	74
1da177e4 LT	75	/* found in socket.c */
881d966b	76	extern void vlan_ioctl_set(int (hook)(struct net , void __user *));
1da177e4	77
5b9ea6e0	78	struct vlan_info;
1da177e4	79
6dcbbe25 NH	80	static inline int is_vlan_dev(struct net_device *dev)
	81	{
	82	return dev->priv_flags & IFF_802_1Q_VLAN;
	83	}
	84
05423b24 ED	85	#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
05423b24 ED	86	#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
1da177e4	87
7750f403	88	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
65ac6a5f	89
cec9c133 JP	90	extern struct net_device __vlan_find_dev_deep(struct net_device real_dev,
cec9c133 JP	91	u16 vlan_id);
22d1ba74 PM	92	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	93	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
	94
6a32e4f9	95	extern bool vlan_do_receive(struct sk_buff **skb, bool last_handler);
bcc6d479	96	extern struct sk_buff vlan_untag(struct sk_buff skb);
9b22ea56	97
87002b03 JP	98	extern int vlan_vid_add(struct net_device *dev, unsigned short vid);
	99	extern void vlan_vid_del(struct net_device *dev, unsigned short vid);
	100
348a1443 JP	101	extern int vlan_vids_add_by_dev(struct net_device *dev,
	102	const struct net_device *by_dev);
	103	extern void vlan_vids_del_by_dev(struct net_device *dev,
	104	const struct net_device *by_dev);
7750f403	105	#else
cec9c133 JP	106	static inline struct net_device *
	107	__vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id)
	108	{
	109	return NULL;
	110	}
	111
22d1ba74 PM	112	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	113	{
	114	BUG();
	115	return NULL;
	116	}
	117
	118	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	119	{
	120	BUG();
	121	return 0;
	122	}
	123
6a32e4f9	124	static inline bool vlan_do_receive(struct sk_buff **skb, bool last_handler)
9b22ea56	125	{
6a32e4f9	126	if (((*skb)->vlan_tci & VLAN_VID_MASK) && last_handler)
0988c4c7	127	(*skb)->pkt_type = PACKET_OTHERHOST;
3701e513	128	return false;
9b22ea56	129	}
e1c096e2	130
6139e75f	131	static inline struct sk_buff vlan_untag(struct sk_buff skb)
bcc6d479 JP	132	{
	133	return skb;
	134	}
87002b03 JP	135
	136	static inline int vlan_vid_add(struct net_device *dev, unsigned short vid)
	137	{
	138	return 0;
	139	}
	140
	141	static inline void vlan_vid_del(struct net_device *dev, unsigned short vid)
	142	{
	143	}
348a1443 JP	144
	145	static inline int vlan_vids_add_by_dev(struct net_device *dev,
	146	const struct net_device *by_dev)
	147	{
	148	return 0;
	149	}
	150
	151	static inline void vlan_vids_del_by_dev(struct net_device *dev,
	152	const struct net_device *by_dev)
	153	{
	154	}
7750f403	155	#endif
1da177e4	156
1da177e4	157	/**
0b5c9db1	158	* vlan_insert_tag - regular VLAN tag inserting
1da177e4	159	* @skb: skbuff to tag
9bb8582e	160	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	161	*
	162	* Inserts the VLAN tag into @skb as part of the payload
	163	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
9bb8582e	164	*
1da177e4 LT	165	* Following the skb_unshare() example, in case of error, the calling function
1da177e4 LT	166	* doesn't have to worry about freeing the original skb.
0b5c9db1 JP	167	*
0b5c9db1 JP	168	* Does not change skb->protocol so this function can be used during receive.
1da177e4	169	*/
0b5c9db1	170	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	171	{
	172	struct vlan_ethhdr *veth;
	173
11a100f8 PM	174	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
	175	kfree_skb(skb);
	176	return NULL;
1da177e4	177	}
1da177e4 LT	178	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	179
	180	/* Move the mac addresses to the beginning of the new header. */
	181	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
e4dd6188	182	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	183
1da177e4 LT	184	/* first, the ethernet type */
57d3ae84	185	veth->h_vlan_proto = htons(ETH_P_8021Q);
1da177e4	186
9bb8582e PM	187	/* now, the TCI */
9bb8582e PM	188	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	189
0b5c9db1 JP	190	return skb;
0b5c9db1 JP	191	}
1da177e4	192
0b5c9db1 JP	193	/**
	194	* __vlan_put_tag - regular VLAN tag inserting
	195	* @skb: skbuff to tag
	196	* @vlan_tci: VLAN TCI to insert
	197	*
	198	* Inserts the VLAN tag into @skb as part of the payload
	199	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	200	*
	201	* Following the skb_unshare() example, in case of error, the calling function
	202	* doesn't have to worry about freeing the original skb.
	203	*/
	204	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
	205	{
	206	skb = vlan_insert_tag(skb, vlan_tci);
	207	if (skb)
	208	skb->protocol = htons(ETH_P_8021Q);
1da177e4 LT	209	return skb;
	210	}
	211
	212	/**
	213	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	214	* @skb: skbuff to tag
9bb8582e	215	* @vlan_tci: VLAN TCI to insert
1da177e4	216	*
6aa895b0	217	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	218	*/
9bb8582e PM	219	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb,
9bb8582e PM	220	u16 vlan_tci)
1da177e4	221	{
05423b24	222	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	223	return skb;
	224	}
	225
	226	#define HAVE_VLAN_PUT_TAG
	227
	228	/**
	229	* vlan_put_tag - inserts VLAN tag according to device features
	230	* @skb: skbuff to tag
9bb8582e	231	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	232	*
	233	* Assumes skb->dev is the target that will xmit this frame.
	234	* Returns a VLAN tagged skb.
	235	*/
9bb8582e	236	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	237	{
1da177e4 LT	238	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	239	return __vlan_hwaccel_put_tag(skb, vlan_tci);
1da177e4	240	} else {
9bb8582e	241	return __vlan_put_tag(skb, vlan_tci);
1da177e4 LT	242	}
	243	}
	244
	245	/**
	246	* __vlan_get_tag - get the VLAN ID that is part of the payload
	247	* @skb: skbuff to query
9bb8582e PM	248	* @vlan_tci: buffer to store vlaue
9bb8582e PM	249	*
1da177e4 LT	250	* Returns error if the skb is not of VLAN type
1da177e4 LT	251	*/
9bb8582e	252	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	253	{
	254	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	255
57d3ae84	256	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
1da177e4 LT	257	return -EINVAL;
	258	}
	259
9bb8582e	260	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	261	return 0;
	262	}
	263
	264	/**
	265	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	266	* @skb: skbuff to query
9bb8582e PM	267	* @vlan_tci: buffer to store vlaue
9bb8582e PM	268	*
6aa895b0	269	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	270	*/
18149935	271	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	272	u16 *vlan_tci)
1da177e4	273	{
6aa895b0	274	if (vlan_tx_tag_present(skb)) {
05423b24	275	*vlan_tci = vlan_tx_tag_get(skb);
1da177e4 LT	276	return 0;
1da177e4 LT	277	} else {
9bb8582e	278	*vlan_tci = 0;
1da177e4 LT	279	return -EINVAL;
	280	}
	281	}
	282
	283	#define HAVE_VLAN_GET_TAG
	284
	285	/**
	286	* vlan_get_tag - get the VLAN ID from the skb
	287	* @skb: skbuff to query
9bb8582e PM	288	* @vlan_tci: buffer to store vlaue
9bb8582e PM	289	*
1da177e4 LT	290	* Returns error if the skb is not VLAN tagged
1da177e4 LT	291	*/
9bb8582e	292	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	293	{
1da177e4 LT	294	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	295	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	296	} else {
9bb8582e	297	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	298	}
	299	}
	300
0a85df00 HZ	301	/**
	302	* vlan_get_protocol - get protocol EtherType.
	303	* @skb: skbuff to query
	304	*
	305	* Returns the EtherType of the packet, regardless of whether it is
	306	* vlan encapsulated (normal or hardware accelerated) or not.
	307	*/
	308	static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
	309	{
	310	__be16 protocol = 0;
	311
	312	if (vlan_tx_tag_present(skb) \|\|
	313	skb->protocol != cpu_to_be16(ETH_P_8021Q))
	314	protocol = skb->protocol;
	315	else {
	316	__be16 proto, *protop;
	317	protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
	318	h_vlan_encapsulated_proto),
	319	sizeof(proto), &proto);
	320	if (likely(protop))
	321	protocol = *protop;
	322	}
	323
	324	return protocol;
	325	}
396cf943 PS	326
	327	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	328	struct vlan_hdr *vhdr)
	329	{
	330	__be16 proto;
	331	unsigned char *rawp;
	332
	333	/*
	334	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	335	* three protocols care about.
	336	*/
	337
	338	proto = vhdr->h_vlan_encapsulated_proto;
	339	if (ntohs(proto) >= 1536) {
	340	skb->protocol = proto;
	341	return;
	342	}
	343
	344	rawp = skb->data;
	345	if ((unsigned short ) rawp == 0xFFFF)
	346	/*
	347	* This is a magic hack to spot IPX packets. Older Novell
	348	* breaks the protocol design and runs IPX over 802.3 without
	349	* an 802.2 LLC layer. We look for FFFF which isn't a used
	350	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	351	* but does for the rest.
	352	*/
	353	skb->protocol = htons(ETH_P_802_3);
	354	else
	355	/*
	356	* Real 802.2 LLC
	357	*/
	358	skb->protocol = htons(ETH_P_802_2);
	359	}
1da177e4 LT	360	#endif /* __KERNEL__ */
	361
	362	/* VLAN IOCTLs are found in sockios.h */
	363
	364	/* Passed in vlan_ioctl_args structure to determine behaviour. */
	365	enum vlan_ioctl_cmds {
	366	ADD_VLAN_CMD,
	367	DEL_VLAN_CMD,
	368	SET_VLAN_INGRESS_PRIORITY_CMD,
	369	SET_VLAN_EGRESS_PRIORITY_CMD,
	370	GET_VLAN_INGRESS_PRIORITY_CMD,
	371	GET_VLAN_EGRESS_PRIORITY_CMD,
	372	SET_VLAN_NAME_TYPE_CMD,
	373	SET_VLAN_FLAG_CMD,
	374	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
	375	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
	376	};
	377
a4bf3af4 PM	378	enum vlan_flags {
a4bf3af4 PM	379	VLAN_FLAG_REORDER_HDR = 0x1,
70c03b49	380	VLAN_FLAG_GVRP = 0x2,
5e756593	381	VLAN_FLAG_LOOSE_BINDING = 0x4,
a4bf3af4 PM	382	};
a4bf3af4 PM	383
1da177e4 LT	384	enum vlan_name_types {
	385	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
	386	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
	387	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
	388	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
	389	VLAN_NAME_TYPE_HIGHEST
	390	};
	391
	392	struct vlan_ioctl_args {
	393	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	394	char device1[24];
	395
	396	union {
	397	char device2[24];
	398	int VID;
	399	unsigned int skb_priority;
	400	unsigned int name_type;
	401	unsigned int bind_type;
7da82c06	402	unsigned int flag; /* Matches vlan_dev_priv flags */
1da177e4 LT	403	} u;
	404
	405	short vlan_qos;
	406	};
	407
	408	#endif /* !(_LINUX_IF_VLAN_H_) */