[mirror_ubuntu-bionic-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_

#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,
					       __be16 vlan_proto, u16 vlan_id);
extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
extern u16 vlan_dev_vlan_id(const struct net_device *dev);

extern 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, __be16 proto, u16 vid);
extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);

extern int vlan_vids_add_by_dev(struct net_device *dev,
				const struct net_device *by_dev);
extern void vlan_vids_del_by_dev(struct net_device *dev,
				 const struct net_device *by_dev);

extern bool vlan_uses_dev(const struct net_device *dev);
#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

static inline bool vlan_hw_offload_capable(netdev_features_t features,
					   __be16 proto)
{
	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
		return true;
	return false;
}

/**
 * vlan_insert_tag - regular VLAN tag inserting
 * @skb: skbuff to tag
 * @vlan_proto: VLAN encapsulation protocol
 * @vlan_tci: VLAN TCI to insert
 *
 * Inserts the VLAN tag into @skb as part of the payload
 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
 *
 * Following the skb_unshare() example, in case of error, the calling function
 * doesn't have to worry about freeing the original skb.
 *
 * Does not change skb->protocol so this function can be used during receive.
 */
static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
					      __be16 vlan_proto, u16 vlan_tci)
{
	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 = vlan_proto;

	/* 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,
					     __be16 vlan_proto, u16 vlan_tci)
{
	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
	if (skb)
		skb->protocol = vlan_proto;
	return skb;
}

/**
 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
 * @skb: skbuff to tag
 * @vlan_proto: VLAN encapsulation protocol
 * @vlan_tci: VLAN TCI to insert
 *
 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
 */
static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
						     __be16 vlan_proto,
						     u16 vlan_tci)
{
	skb->vlan_proto = vlan_proto;
	skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
	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,
					   __be16 vlan_proto, u16 vlan_tci)
{
	if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
		return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
	} else {
		return __vlan_put_tag(skb, vlan_proto, 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_CTAG_TX) {
		return __vlan_hwaccel_get_tag(skb, vlan_tci);
	} else {
		return __vlan_get_tag(skb, vlan_tci);
	}
}

/**
 * vlan_get_protocol - get protocol EtherType.
 * @skb: skbuff to query
 *
 * 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) >= ETH_P_802_3_MIN) {
		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	88	extern struct net_device __vlan_find_dev_deep(struct net_device real_dev,
1fd9b1fc	89	__be16 vlan_proto, 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
80d5c368 PM	96	extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
80d5c368 PM	97	extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
87002b03	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
86a9bad3 PM	160	static inline bool vlan_hw_offload_capable(netdev_features_t features,
	161	__be16 proto)
	162	{
	163	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
	164	return true;
	165	return false;
	166	}
	167
1da177e4	168	/**
0b5c9db1	169	* vlan_insert_tag - regular VLAN tag inserting
1da177e4	170	* @skb: skbuff to tag
86a9bad3	171	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	172	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	173	*
	174	* Inserts the VLAN tag into @skb as part of the payload
	175	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
9bb8582e	176	*
1da177e4 LT	177	* Following the skb_unshare() example, in case of error, the calling function
1da177e4 LT	178	* doesn't have to worry about freeing the original skb.
0b5c9db1 JP	179	*
0b5c9db1 JP	180	* Does not change skb->protocol so this function can be used during receive.
1da177e4	181	*/
86a9bad3 PM	182	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb,
86a9bad3 PM	183	__be16 vlan_proto, u16 vlan_tci)
1da177e4 LT	184	{
	185	struct vlan_ethhdr *veth;
	186
11a100f8 PM	187	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
	188	kfree_skb(skb);
	189	return NULL;
1da177e4	190	}
1da177e4 LT	191	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	192
	193	/* Move the mac addresses to the beginning of the new header. */
a3f671b3	194	memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
e4dd6188	195	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	196
1da177e4 LT	197	/* first, the ethernet type */
86a9bad3	198	veth->h_vlan_proto = vlan_proto;
1da177e4	199
9bb8582e PM	200	/* now, the TCI */
9bb8582e PM	201	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	202
0b5c9db1 JP	203	return skb;
0b5c9db1 JP	204	}
1da177e4	205
0b5c9db1 JP	206	/**
	207	* __vlan_put_tag - regular VLAN tag inserting
	208	* @skb: skbuff to tag
	209	* @vlan_tci: VLAN TCI to insert
	210	*
	211	* Inserts the VLAN tag into @skb as part of the payload
	212	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	213	*
	214	* Following the skb_unshare() example, in case of error, the calling function
	215	* doesn't have to worry about freeing the original skb.
	216	*/
86a9bad3 PM	217	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb,
86a9bad3 PM	218	__be16 vlan_proto, u16 vlan_tci)
0b5c9db1	219	{
86a9bad3	220	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
0b5c9db1	221	if (skb)
86a9bad3	222	skb->protocol = vlan_proto;
1da177e4 LT	223	return skb;
	224	}
	225
	226	/**
	227	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	228	* @skb: skbuff to tag
86a9bad3	229	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	230	* @vlan_tci: VLAN TCI to insert
1da177e4	231	*
6aa895b0	232	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	233	*/
9bb8582e	234	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb,
86a9bad3	235	__be16 vlan_proto,
9bb8582e	236	u16 vlan_tci)
1da177e4	237	{
86a9bad3	238	skb->vlan_proto = vlan_proto;
05423b24	239	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	240	return skb;
	241	}
	242
	243	#define HAVE_VLAN_PUT_TAG
	244
	245	/**
	246	* vlan_put_tag - inserts VLAN tag according to device features
	247	* @skb: skbuff to tag
9bb8582e	248	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	249	*
	250	* Assumes skb->dev is the target that will xmit this frame.
	251	* Returns a VLAN tagged skb.
	252	*/
86a9bad3 PM	253	static inline struct sk_buff vlan_put_tag(struct sk_buff skb,
86a9bad3 PM	254	__be16 vlan_proto, u16 vlan_tci)
1da177e4	255	{
86a9bad3 PM	256	if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
86a9bad3 PM	257	return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
1da177e4	258	} else {
86a9bad3	259	return __vlan_put_tag(skb, vlan_proto, vlan_tci);
1da177e4 LT	260	}
	261	}
	262
	263	/**
	264	* __vlan_get_tag - get the VLAN ID that is part of the payload
	265	* @skb: skbuff to query
9bb8582e PM	266	* @vlan_tci: buffer to store vlaue
9bb8582e PM	267	*
1da177e4 LT	268	* Returns error if the skb is not of VLAN type
1da177e4 LT	269	*/
9bb8582e	270	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	271	{
	272	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	273
57d3ae84	274	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
1da177e4 LT	275	return -EINVAL;
	276	}
	277
9bb8582e	278	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	279	return 0;
	280	}
	281
	282	/**
	283	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	284	* @skb: skbuff to query
9bb8582e PM	285	* @vlan_tci: buffer to store vlaue
9bb8582e PM	286	*
6aa895b0	287	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	288	*/
18149935	289	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	290	u16 *vlan_tci)
1da177e4	291	{
6aa895b0	292	if (vlan_tx_tag_present(skb)) {
05423b24	293	*vlan_tci = vlan_tx_tag_get(skb);
1da177e4 LT	294	return 0;
1da177e4 LT	295	} else {
9bb8582e	296	*vlan_tci = 0;
1da177e4 LT	297	return -EINVAL;
	298	}
	299	}
	300
	301	#define HAVE_VLAN_GET_TAG
	302
	303	/**
	304	* vlan_get_tag - get the VLAN ID from the skb
	305	* @skb: skbuff to query
9bb8582e PM	306	* @vlan_tci: buffer to store vlaue
9bb8582e PM	307	*
1da177e4 LT	308	* Returns error if the skb is not VLAN tagged
1da177e4 LT	309	*/
9bb8582e	310	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4	311	{
f646968f	312	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
9bb8582e	313	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	314	} else {
9bb8582e	315	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	316	}
	317	}
	318
0a85df00 HZ	319	/**
	320	* vlan_get_protocol - get protocol EtherType.
	321	* @skb: skbuff to query
	322	*
	323	* Returns the EtherType of the packet, regardless of whether it is
	324	* vlan encapsulated (normal or hardware accelerated) or not.
	325	*/
	326	static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
	327	{
	328	__be16 protocol = 0;
	329
	330	if (vlan_tx_tag_present(skb) \|\|
	331	skb->protocol != cpu_to_be16(ETH_P_8021Q))
	332	protocol = skb->protocol;
	333	else {
	334	__be16 proto, *protop;
	335	protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
	336	h_vlan_encapsulated_proto),
	337	sizeof(proto), &proto);
	338	if (likely(protop))
	339	protocol = *protop;
	340	}
	341
	342	return protocol;
	343	}
396cf943 PS	344
	345	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	346	struct vlan_hdr *vhdr)
	347	{
	348	__be16 proto;
da8c8724	349	unsigned short *rawp;
396cf943 PS	350
	351	/*
	352	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	353	* three protocols care about.
	354	*/
	355
	356	proto = vhdr->h_vlan_encapsulated_proto;
e5c5d22e	357	if (ntohs(proto) >= ETH_P_802_3_MIN) {
396cf943 PS	358	skb->protocol = proto;
	359	return;
	360	}
	361
da8c8724 CW	362	rawp = (unsigned short *)(vhdr + 1);
da8c8724 CW	363	if (*rawp == 0xFFFF)
396cf943 PS	364	/*
	365	* This is a magic hack to spot IPX packets. Older Novell
	366	* breaks the protocol design and runs IPX over 802.3 without
	367	* an 802.2 LLC layer. We look for FFFF which isn't a used
	368	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	369	* but does for the rest.
	370	*/
	371	skb->protocol = htons(ETH_P_802_3);
	372	else
	373	/*
	374	* Real 802.2 LLC
	375	*/
	376	skb->protocol = htons(ETH_P_802_2);
	377	}
1da177e4	378	#endif /* !(_LINUX_IF_VLAN_H_) */