[linux-2.6-block.git] / include / linux / if_vlan.h

/*
 * VLAN		An implementation of 802.1Q VLAN tagging.
 *
 * Authors:	Ben Greear <greearb@candelatech.com>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 */
#ifndef _LINUX_IF_VLAN_H_
#define _LINUX_IF_VLAN_H_

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/bug.h>
#include <uapi/linux/if_vlan.h>

#define VLAN_HLEN	4		/* The additional bytes required by VLAN
					 * (in addition to the Ethernet header)
					 */
#define VLAN_ETH_HLEN	18		/* Total octets in header.	 */
#define VLAN_ETH_ZLEN	64		/* Min. octets in frame sans FCS */

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

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

/**
 *	struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
 *	@h_dest: destination ethernet address
 *	@h_source: source ethernet address
 *	@h_vlan_proto: ethernet protocol (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 *));

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_nonzero_tag_present(__skb) \
	(vlan_tx_tag_present(__skb) && ((__skb)->vlan_tci & VLAN_VID_MASK))
#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);
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);

extern bool vlan_uses_dev(const struct net_device *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)
{
	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)
{
}

static inline bool vlan_uses_dev(const struct net_device *dev)
{
	return false;
}
#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 * 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 short *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 = (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);
}
#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
	47	* @h_vlan_proto: ethernet protocol (always 0x8100)
	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
6dcbbe25 NH	76	static inline int is_vlan_dev(struct net_device *dev)
	77	{
	78	return dev->priv_flags & IFF_802_1Q_VLAN;
	79	}
	80
05423b24	81	#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
48cc32d3 FZ	82	#define vlan_tx_nonzero_tag_present(__skb) \
48cc32d3 FZ	83	(vlan_tx_tag_present(__skb) && ((__skb)->vlan_tci & VLAN_VID_MASK))
05423b24	84	#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
1da177e4	85
7750f403	86	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
65ac6a5f	87
cec9c133 JP	88	extern struct net_device __vlan_find_dev_deep(struct net_device real_dev,
cec9c133 JP	89	u16 vlan_id);
22d1ba74 PM	90	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	91	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
	92
48cc32d3	93	extern bool vlan_do_receive(struct sk_buff **skb);
bcc6d479	94	extern struct sk_buff vlan_untag(struct sk_buff skb);
9b22ea56	95
87002b03 JP	96	extern int vlan_vid_add(struct net_device *dev, unsigned short vid);
	97	extern void vlan_vid_del(struct net_device *dev, unsigned short vid);
	98
348a1443 JP	99	extern int vlan_vids_add_by_dev(struct net_device *dev,
	100	const struct net_device *by_dev);
	101	extern void vlan_vids_del_by_dev(struct net_device *dev,
	102	const struct net_device *by_dev);
9b361c13 JP	103
9b361c13 JP	104	extern bool vlan_uses_dev(const struct net_device *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
48cc32d3	124	static inline bool vlan_do_receive(struct sk_buff **skb)
9b22ea56	125	{
3701e513	126	return false;
9b22ea56	127	}
e1c096e2	128
6139e75f	129	static inline struct sk_buff vlan_untag(struct sk_buff skb)
bcc6d479 JP	130	{
	131	return skb;
	132	}
87002b03 JP	133
	134	static inline int vlan_vid_add(struct net_device *dev, unsigned short vid)
	135	{
	136	return 0;
	137	}
	138
	139	static inline void vlan_vid_del(struct net_device *dev, unsigned short vid)
	140	{
	141	}
348a1443 JP	142
	143	static inline int vlan_vids_add_by_dev(struct net_device *dev,
	144	const struct net_device *by_dev)
	145	{
	146	return 0;
	147	}
	148
	149	static inline void vlan_vids_del_by_dev(struct net_device *dev,
	150	const struct net_device *by_dev)
	151	{
	152	}
9b361c13 JP	153
	154	static inline bool vlan_uses_dev(const struct net_device *dev)
	155	{
	156	return false;
	157	}
7750f403	158	#endif
1da177e4	159
1da177e4	160	/**
0b5c9db1	161	* vlan_insert_tag - regular VLAN tag inserting
1da177e4	162	* @skb: skbuff to tag
9bb8582e	163	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	164	*
	165	* Inserts the VLAN tag into @skb as part of the payload
	166	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
9bb8582e	167	*
1da177e4 LT	168	* Following the skb_unshare() example, in case of error, the calling function
1da177e4 LT	169	* doesn't have to worry about freeing the original skb.
0b5c9db1 JP	170	*
0b5c9db1 JP	171	* Does not change skb->protocol so this function can be used during receive.
1da177e4	172	*/
0b5c9db1	173	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	174	{
	175	struct vlan_ethhdr *veth;
	176
11a100f8 PM	177	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
	178	kfree_skb(skb);
	179	return NULL;
1da177e4	180	}
1da177e4 LT	181	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	182
	183	/* Move the mac addresses to the beginning of the new header. */
a3f671b3	184	memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
e4dd6188	185	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	186
1da177e4 LT	187	/* first, the ethernet type */
57d3ae84	188	veth->h_vlan_proto = htons(ETH_P_8021Q);
1da177e4	189
9bb8582e PM	190	/* now, the TCI */
9bb8582e PM	191	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	192
0b5c9db1 JP	193	return skb;
0b5c9db1 JP	194	}
1da177e4	195
0b5c9db1 JP	196	/**
	197	* __vlan_put_tag - regular VLAN tag inserting
	198	* @skb: skbuff to tag
	199	* @vlan_tci: VLAN TCI to insert
	200	*
	201	* Inserts the VLAN tag into @skb as part of the payload
	202	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	203	*
	204	* Following the skb_unshare() example, in case of error, the calling function
	205	* doesn't have to worry about freeing the original skb.
	206	*/
	207	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
	208	{
	209	skb = vlan_insert_tag(skb, vlan_tci);
	210	if (skb)
	211	skb->protocol = htons(ETH_P_8021Q);
1da177e4 LT	212	return skb;
	213	}
	214
	215	/**
	216	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	217	* @skb: skbuff to tag
9bb8582e	218	* @vlan_tci: VLAN TCI to insert
1da177e4	219	*
6aa895b0	220	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	221	*/
9bb8582e PM	222	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb,
9bb8582e PM	223	u16 vlan_tci)
1da177e4	224	{
05423b24	225	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	226	return skb;
	227	}
	228
	229	#define HAVE_VLAN_PUT_TAG
	230
	231	/**
	232	* vlan_put_tag - inserts VLAN tag according to device features
	233	* @skb: skbuff to tag
9bb8582e	234	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	235	*
	236	* Assumes skb->dev is the target that will xmit this frame.
	237	* Returns a VLAN tagged skb.
	238	*/
9bb8582e	239	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	240	{
1da177e4 LT	241	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	242	return __vlan_hwaccel_put_tag(skb, vlan_tci);
1da177e4	243	} else {
9bb8582e	244	return __vlan_put_tag(skb, vlan_tci);
1da177e4 LT	245	}
	246	}
	247
	248	/**
	249	* __vlan_get_tag - get the VLAN ID that is part of the payload
	250	* @skb: skbuff to query
9bb8582e PM	251	* @vlan_tci: buffer to store vlaue
9bb8582e PM	252	*
1da177e4 LT	253	* Returns error if the skb is not of VLAN type
1da177e4 LT	254	*/
9bb8582e	255	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	256	{
	257	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	258
57d3ae84	259	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
1da177e4 LT	260	return -EINVAL;
	261	}
	262
9bb8582e	263	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	264	return 0;
	265	}
	266
	267	/**
	268	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	269	* @skb: skbuff to query
9bb8582e PM	270	* @vlan_tci: buffer to store vlaue
9bb8582e PM	271	*
6aa895b0	272	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	273	*/
18149935	274	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	275	u16 *vlan_tci)
1da177e4	276	{
6aa895b0	277	if (vlan_tx_tag_present(skb)) {
05423b24	278	*vlan_tci = vlan_tx_tag_get(skb);
1da177e4 LT	279	return 0;
1da177e4 LT	280	} else {
9bb8582e	281	*vlan_tci = 0;
1da177e4 LT	282	return -EINVAL;
	283	}
	284	}
	285
	286	#define HAVE_VLAN_GET_TAG
	287
	288	/**
	289	* vlan_get_tag - get the VLAN ID from the skb
	290	* @skb: skbuff to query
9bb8582e PM	291	* @vlan_tci: buffer to store vlaue
9bb8582e PM	292	*
1da177e4 LT	293	* Returns error if the skb is not VLAN tagged
1da177e4 LT	294	*/
9bb8582e	295	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	296	{
1da177e4 LT	297	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
9bb8582e	298	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	299	} else {
9bb8582e	300	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	301	}
	302	}
	303
0a85df00 HZ	304	/**
	305	* vlan_get_protocol - get protocol EtherType.
	306	* @skb: skbuff to query
	307	*
	308	* Returns the EtherType of the packet, regardless of whether it is
	309	* vlan encapsulated (normal or hardware accelerated) or not.
	310	*/
	311	static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
	312	{
	313	__be16 protocol = 0;
	314
	315	if (vlan_tx_tag_present(skb) \|\|
	316	skb->protocol != cpu_to_be16(ETH_P_8021Q))
	317	protocol = skb->protocol;
	318	else {
	319	__be16 proto, *protop;
	320	protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
	321	h_vlan_encapsulated_proto),
	322	sizeof(proto), &proto);
	323	if (likely(protop))
	324	protocol = *protop;
	325	}
	326
	327	return protocol;
	328	}
396cf943 PS	329
	330	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	331	struct vlan_hdr *vhdr)
	332	{
	333	__be16 proto;
da8c8724	334	unsigned short *rawp;
396cf943 PS	335
	336	/*
	337	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	338	* three protocols care about.
	339	*/
	340
	341	proto = vhdr->h_vlan_encapsulated_proto;
	342	if (ntohs(proto) >= 1536) {
	343	skb->protocol = proto;
	344	return;
	345	}
	346
da8c8724 CW	347	rawp = (unsigned short *)(vhdr + 1);
da8c8724 CW	348	if (*rawp == 0xFFFF)
396cf943 PS	349	/*
	350	* This is a magic hack to spot IPX packets. Older Novell
	351	* breaks the protocol design and runs IPX over 802.3 without
	352	* an 802.2 LLC layer. We look for FFFF which isn't a used
	353	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	354	* but does for the rest.
	355	*/
	356	skb->protocol = htons(ETH_P_802_3);
	357	else
	358	/*
	359	* Real 802.2 LLC
	360	*/
	361	skb->protocol = htons(ETH_P_802_2);
	362	}
1da177e4	363	#endif /* !(_LINUX_IF_VLAN_H_) */