[mirror_ubuntu-artful-kernel.git] / include / linux / if_vlan.h

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

#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
 *	@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_tag_get(__skb)		((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
#define vlan_tx_tag_get_id(__skb)	((__skb)->vlan_tci & VLAN_VID_MASK)

/**
 *	struct vlan_pcpu_stats - VLAN percpu rx/tx stats
 *	@rx_packets: number of received packets
 *	@rx_bytes: number of received bytes
 *	@rx_multicast: number of received multicast packets
 *	@tx_packets: number of transmitted packets
 *	@tx_bytes: number of transmitted bytes
 *	@syncp: synchronization point for 64bit counters
 *	@rx_errors: number of rx errors
 *	@tx_dropped: number of tx drops
 */
struct vlan_pcpu_stats {
	u64			rx_packets;
	u64			rx_bytes;
	u64			rx_multicast;
	u64			tx_packets;
	u64			tx_bytes;
	struct u64_stats_sync	syncp;
	u32			rx_errors;
	u32			tx_dropped;
};

#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 __be16 vlan_dev_vlan_proto(const struct net_device *dev);

/**
 *	struct vlan_priority_tci_mapping - vlan egress priority mappings
 *	@priority: skb priority
 *	@vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
 *	@next: pointer to next struct
 */
struct vlan_priority_tci_mapping {
	u32					priority;
	u16					vlan_qos;
	struct vlan_priority_tci_mapping	*next;
};

struct proc_dir_entry;
struct netpoll;

/**
 *	struct vlan_dev_priv - VLAN private device data
 *	@nr_ingress_mappings: number of ingress priority mappings
 *	@ingress_priority_map: ingress priority mappings
 *	@nr_egress_mappings: number of egress priority mappings
 *	@egress_priority_map: hash of egress priority mappings
 *	@vlan_proto: VLAN encapsulation protocol
 *	@vlan_id: VLAN identifier
 *	@flags: device flags
 *	@real_dev: underlying netdevice
 *	@real_dev_addr: address of underlying netdevice
 *	@dent: proc dir entry
 *	@vlan_pcpu_stats: ptr to percpu rx stats
 */
struct vlan_dev_priv {
	unsigned int				nr_ingress_mappings;
	u32					ingress_priority_map[8];
	unsigned int				nr_egress_mappings;
	struct vlan_priority_tci_mapping	*egress_priority_map[16];

	__be16					vlan_proto;
	u16					vlan_id;
	u16					flags;

	struct net_device			*real_dev;
	unsigned char				real_dev_addr[ETH_ALEN];

	struct proc_dir_entry			*dent;
	struct vlan_pcpu_stats __percpu		*vlan_pcpu_stats;
#ifdef CONFIG_NET_POLL_CONTROLLER
	struct netpoll				*netpoll;
#endif
};

static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
{
	return netdev_priv(dev);
}

static inline u16
vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
{
	struct vlan_priority_tci_mapping *mp;

	smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */

	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
	while (mp) {
		if (mp->priority == skprio) {
			return mp->vlan_qos; /* This should already be shifted
					      * to mask correctly with the
					      * VLAN's TCI */
		}
		mp = mp->next;
	}
	return 0;
}

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,
		     __be16 vlan_proto, 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 __be16 vlan_dev_vlan_proto(const struct net_device *dev)
{
	BUG();
	return 0;
}

static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
					       u32 skprio)
{
	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, __be16 proto, u16 vid)
{
	return 0;
}

static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 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;
	if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_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) {
		dev_kfree_skb_any(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;
}

/**
 * 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) &&
	    veth->h_vlan_proto != htons(ETH_P_8021AD))
		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
a7bf5804	47	* @h_vlan_proto: ethernet protocol
740c15d0 PM	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 ED	81	#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
05423b24 ED	82	#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
d4b812de	83	#define vlan_tx_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
1da177e4	84
e267cb96 DM	85	/**
	86	* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
	87	* @rx_packets: number of received packets
	88	* @rx_bytes: number of received bytes
	89	* @rx_multicast: number of received multicast packets
	90	* @tx_packets: number of transmitted packets
	91	* @tx_bytes: number of transmitted bytes
	92	* @syncp: synchronization point for 64bit counters
	93	* @rx_errors: number of rx errors
	94	* @tx_dropped: number of tx drops
	95	*/
	96	struct vlan_pcpu_stats {
	97	u64 rx_packets;
	98	u64 rx_bytes;
	99	u64 rx_multicast;
	100	u64 tx_packets;
	101	u64 tx_bytes;
	102	struct u64_stats_sync syncp;
	103	u32 rx_errors;
	104	u32 tx_dropped;
	105	};
	106
1e85c9b6 HFS	107	#if defined(CONFIG_VLAN_8021Q) \|\| defined(CONFIG_VLAN_8021Q_MODULE)
	108
	109	extern struct net_device __vlan_find_dev_deep(struct net_device real_dev,
	110	__be16 vlan_proto, u16 vlan_id);
	111	extern struct net_device vlan_dev_real_dev(const struct net_device dev);
	112	extern u16 vlan_dev_vlan_id(const struct net_device *dev);
71e415e4	113	extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
1e85c9b6 HFS	114
	115	/**
	116	* struct vlan_priority_tci_mapping - vlan egress priority mappings
	117	* @priority: skb priority
	118	* @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
	119	* @next: pointer to next struct
	120	*/
	121	struct vlan_priority_tci_mapping {
	122	u32 priority;
	123	u16 vlan_qos;
	124	struct vlan_priority_tci_mapping *next;
	125	};
	126
e267cb96 DM	127	struct proc_dir_entry;
	128	struct netpoll;
	129
	130	/**
	131	* struct vlan_dev_priv - VLAN private device data
	132	* @nr_ingress_mappings: number of ingress priority mappings
	133	* @ingress_priority_map: ingress priority mappings
	134	* @nr_egress_mappings: number of egress priority mappings
	135	* @egress_priority_map: hash of egress priority mappings
	136	* @vlan_proto: VLAN encapsulation protocol
	137	* @vlan_id: VLAN identifier
	138	* @flags: device flags
	139	* @real_dev: underlying netdevice
	140	* @real_dev_addr: address of underlying netdevice
	141	* @dent: proc dir entry
	142	* @vlan_pcpu_stats: ptr to percpu rx stats
	143	*/
	144	struct vlan_dev_priv {
	145	unsigned int nr_ingress_mappings;
	146	u32 ingress_priority_map[8];
	147	unsigned int nr_egress_mappings;
	148	struct vlan_priority_tci_mapping *egress_priority_map[16];
	149
	150	__be16 vlan_proto;
	151	u16 vlan_id;
	152	u16 flags;
	153
	154	struct net_device *real_dev;
	155	unsigned char real_dev_addr[ETH_ALEN];
	156
	157	struct proc_dir_entry *dent;
	158	struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
	159	#ifdef CONFIG_NET_POLL_CONTROLLER
	160	struct netpoll *netpoll;
	161	#endif
	162	};
	163
	164	static inline struct vlan_dev_priv vlan_dev_priv(const struct net_device dev)
	165	{
	166	return netdev_priv(dev);
	167	}
	168
	169	static inline u16
	170	vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
	171	{
	172	struct vlan_priority_tci_mapping *mp;
	173
	174	smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
	175
	176	mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
	177	while (mp) {
	178	if (mp->priority == skprio) {
	179	return mp->vlan_qos; /* This should already be shifted
	180	* to mask correctly with the
	181	* VLAN's TCI */
	182	}
	183	mp = mp->next;
	184	}
	185	return 0;
	186	}
	187
48cc32d3	188	extern bool vlan_do_receive(struct sk_buff **skb);
bcc6d479	189	extern struct sk_buff vlan_untag(struct sk_buff skb);
9b22ea56	190
80d5c368 PM	191	extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
80d5c368 PM	192	extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
87002b03	193
348a1443 JP	194	extern int vlan_vids_add_by_dev(struct net_device *dev,
	195	const struct net_device *by_dev);
	196	extern void vlan_vids_del_by_dev(struct net_device *dev,
	197	const struct net_device *by_dev);
9b361c13 JP	198
9b361c13 JP	199	extern bool vlan_uses_dev(const struct net_device *dev);
7750f403	200	#else
cec9c133	201	static inline struct net_device *
9fae27b3 PM	202	__vlan_find_dev_deep(struct net_device *real_dev,
9fae27b3 PM	203	__be16 vlan_proto, u16 vlan_id)
cec9c133 JP	204	{
	205	return NULL;
	206	}
	207
22d1ba74 PM	208	static inline struct net_device vlan_dev_real_dev(const struct net_device dev)
	209	{
	210	BUG();
	211	return NULL;
	212	}
	213
	214	static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
	215	{
	216	BUG();
	217	return 0;
	218	}
	219
71e415e4	220	static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
	221	{
	222	BUG();
	223	return 0;
	224	}
	225
d3243539 EP	226	static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
	227	u32 skprio)
	228	{
	229	return 0;
	230	}
	231
48cc32d3	232	static inline bool vlan_do_receive(struct sk_buff **skb)
9b22ea56	233	{
3701e513	234	return false;
9b22ea56	235	}
e1c096e2	236
6139e75f	237	static inline struct sk_buff vlan_untag(struct sk_buff skb)
bcc6d479 JP	238	{
	239	return skb;
	240	}
87002b03	241
9fae27b3	242	static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
87002b03 JP	243	{
	244	return 0;
	245	}
	246
9fae27b3	247	static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
87002b03 JP	248	{
87002b03 JP	249	}
348a1443 JP	250
	251	static inline int vlan_vids_add_by_dev(struct net_device *dev,
	252	const struct net_device *by_dev)
	253	{
	254	return 0;
	255	}
	256
	257	static inline void vlan_vids_del_by_dev(struct net_device *dev,
	258	const struct net_device *by_dev)
	259	{
	260	}
9b361c13 JP	261
	262	static inline bool vlan_uses_dev(const struct net_device *dev)
	263	{
	264	return false;
	265	}
7750f403	266	#endif
1da177e4	267
86a9bad3 PM	268	static inline bool vlan_hw_offload_capable(netdev_features_t features,
	269	__be16 proto)
	270	{
	271	if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
	272	return true;
8ad227ff PM	273	if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
8ad227ff PM	274	return true;
86a9bad3 PM	275	return false;
	276	}
	277
1da177e4	278	/**
0b5c9db1	279	* vlan_insert_tag - regular VLAN tag inserting
1da177e4	280	* @skb: skbuff to tag
86a9bad3	281	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	282	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	283	*
	284	* Inserts the VLAN tag into @skb as part of the payload
	285	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
9bb8582e	286	*
1da177e4 LT	287	* Following the skb_unshare() example, in case of error, the calling function
1da177e4 LT	288	* doesn't have to worry about freeing the original skb.
0b5c9db1 JP	289	*
0b5c9db1 JP	290	* Does not change skb->protocol so this function can be used during receive.
1da177e4	291	*/
86a9bad3 PM	292	static inline struct sk_buff vlan_insert_tag(struct sk_buff skb,
86a9bad3 PM	293	__be16 vlan_proto, u16 vlan_tci)
1da177e4 LT	294	{
	295	struct vlan_ethhdr *veth;
	296
11a100f8	297	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
fb7c03df	298	dev_kfree_skb_any(skb);
11a100f8	299	return NULL;
1da177e4	300	}
1da177e4 LT	301	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	302
	303	/* Move the mac addresses to the beginning of the new header. */
a3f671b3	304	memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
e4dd6188	305	skb->mac_header -= VLAN_HLEN;
1da177e4 LT	306
1da177e4 LT	307	/* first, the ethernet type */
86a9bad3	308	veth->h_vlan_proto = vlan_proto;
1da177e4	309
9bb8582e PM	310	/* now, the TCI */
9bb8582e PM	311	veth->h_vlan_TCI = htons(vlan_tci);
1da177e4	312
0b5c9db1 JP	313	return skb;
0b5c9db1 JP	314	}
1da177e4	315
0b5c9db1 JP	316	/**
	317	* __vlan_put_tag - regular VLAN tag inserting
	318	* @skb: skbuff to tag
	319	* @vlan_tci: VLAN TCI to insert
	320	*
	321	* Inserts the VLAN tag into @skb as part of the payload
	322	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	323	*
	324	* Following the skb_unshare() example, in case of error, the calling function
	325	* doesn't have to worry about freeing the original skb.
	326	*/
86a9bad3 PM	327	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb,
86a9bad3 PM	328	__be16 vlan_proto, u16 vlan_tci)
0b5c9db1	329	{
86a9bad3	330	skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
0b5c9db1	331	if (skb)
86a9bad3	332	skb->protocol = vlan_proto;
1da177e4 LT	333	return skb;
	334	}
	335
	336	/**
	337	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	338	* @skb: skbuff to tag
86a9bad3	339	* @vlan_proto: VLAN encapsulation protocol
9bb8582e	340	* @vlan_tci: VLAN TCI to insert
1da177e4	341	*
6aa895b0	342	* Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
1da177e4	343	*/
9bb8582e	344	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb,
86a9bad3	345	__be16 vlan_proto,
9bb8582e	346	u16 vlan_tci)
1da177e4	347	{
86a9bad3	348	skb->vlan_proto = vlan_proto;
05423b24	349	skb->vlan_tci = VLAN_TAG_PRESENT \| vlan_tci;
1da177e4 LT	350	return skb;
	351	}
	352
1da177e4 LT	353	/**
	354	* vlan_put_tag - inserts VLAN tag according to device features
	355	* @skb: skbuff to tag
9bb8582e	356	* @vlan_tci: VLAN TCI to insert
1da177e4 LT	357	*
	358	* Assumes skb->dev is the target that will xmit this frame.
	359	* Returns a VLAN tagged skb.
	360	*/
86a9bad3 PM	361	static inline struct sk_buff vlan_put_tag(struct sk_buff skb,
86a9bad3 PM	362	__be16 vlan_proto, u16 vlan_tci)
1da177e4	363	{
86a9bad3 PM	364	if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
86a9bad3 PM	365	return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
1da177e4	366	} else {
86a9bad3	367	return __vlan_put_tag(skb, vlan_proto, vlan_tci);
1da177e4 LT	368	}
	369	}
	370
	371	/**
	372	* __vlan_get_tag - get the VLAN ID that is part of the payload
	373	* @skb: skbuff to query
9bb8582e PM	374	* @vlan_tci: buffer to store vlaue
9bb8582e PM	375	*
1da177e4 LT	376	* Returns error if the skb is not of VLAN type
1da177e4 LT	377	*/
9bb8582e	378	static inline int __vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4 LT	379	{
	380	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	381
8ad227ff PM	382	if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
8ad227ff PM	383	veth->h_vlan_proto != htons(ETH_P_8021AD))
1da177e4	384	return -EINVAL;
1da177e4	385
9bb8582e	386	*vlan_tci = ntohs(veth->h_vlan_TCI);
1da177e4 LT	387	return 0;
	388	}
	389
	390	/**
	391	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	392	* @skb: skbuff to query
9bb8582e PM	393	* @vlan_tci: buffer to store vlaue
9bb8582e PM	394	*
6aa895b0	395	* Returns error if @skb->vlan_tci is not set correctly
1da177e4	396	*/
18149935	397	static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
9bb8582e	398	u16 *vlan_tci)
1da177e4	399	{
6aa895b0	400	if (vlan_tx_tag_present(skb)) {
05423b24	401	*vlan_tci = vlan_tx_tag_get(skb);
1da177e4 LT	402	return 0;
1da177e4 LT	403	} else {
9bb8582e	404	*vlan_tci = 0;
1da177e4 LT	405	return -EINVAL;
	406	}
	407	}
	408
	409	#define HAVE_VLAN_GET_TAG
	410
	411	/**
	412	* vlan_get_tag - get the VLAN ID from the skb
	413	* @skb: skbuff to query
9bb8582e PM	414	* @vlan_tci: buffer to store vlaue
9bb8582e PM	415	*
1da177e4 LT	416	* Returns error if the skb is not VLAN tagged
1da177e4 LT	417	*/
9bb8582e	418	static inline int vlan_get_tag(const struct sk_buff skb, u16 vlan_tci)
1da177e4	419	{
f646968f	420	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
9bb8582e	421	return __vlan_hwaccel_get_tag(skb, vlan_tci);
1da177e4	422	} else {
9bb8582e	423	return __vlan_get_tag(skb, vlan_tci);
1da177e4 LT	424	}
	425	}
	426
0a85df00 HZ	427	/**
	428	* vlan_get_protocol - get protocol EtherType.
	429	* @skb: skbuff to query
	430	*
	431	* Returns the EtherType of the packet, regardless of whether it is
	432	* vlan encapsulated (normal or hardware accelerated) or not.
	433	*/
	434	static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
	435	{
	436	__be16 protocol = 0;
	437
	438	if (vlan_tx_tag_present(skb) \|\|
	439	skb->protocol != cpu_to_be16(ETH_P_8021Q))
	440	protocol = skb->protocol;
	441	else {
	442	__be16 proto, *protop;
	443	protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
	444	h_vlan_encapsulated_proto),
	445	sizeof(proto), &proto);
	446	if (likely(protop))
	447	protocol = *protop;
	448	}
	449
	450	return protocol;
	451	}
396cf943 PS	452
	453	static inline void vlan_set_encap_proto(struct sk_buff *skb,
	454	struct vlan_hdr *vhdr)
	455	{
	456	__be16 proto;
da8c8724	457	unsigned short *rawp;
396cf943 PS	458
	459	/*
	460	* Was a VLAN packet, grab the encapsulated protocol, which the layer
	461	* three protocols care about.
	462	*/
	463
	464	proto = vhdr->h_vlan_encapsulated_proto;
e5c5d22e	465	if (ntohs(proto) >= ETH_P_802_3_MIN) {
396cf943 PS	466	skb->protocol = proto;
	467	return;
	468	}
	469
da8c8724 CW	470	rawp = (unsigned short *)(vhdr + 1);
da8c8724 CW	471	if (*rawp == 0xFFFF)
396cf943 PS	472	/*
	473	* This is a magic hack to spot IPX packets. Older Novell
	474	* breaks the protocol design and runs IPX over 802.3 without
	475	* an 802.2 LLC layer. We look for FFFF which isn't a used
	476	* 802.2 SSAP/DSAP. This won't work for fault tolerant netware
	477	* but does for the rest.
	478	*/
	479	skb->protocol = htons(ETH_P_802_3);
	480	else
	481	/*
	482	* Real 802.2 LLC
	483	*/
	484	skb->protocol = htons(ETH_P_802_2);
	485	}
1da177e4	486	#endif /* !(_LINUX_IF_VLAN_H_) */