[deliverable/linux.git] / include / linux / if_vlan.h

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

#ifndef _LINUX_IF_VLAN_H_
#define _LINUX_IF_VLAN_H_

#ifdef __KERNEL__

/* externally defined structs */
struct hlist_node;

#include <linux/netdevice.h>
#include <linux/etherdevice.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_VID_MASK	0xfff

/* found in socket.c */
extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));

/* if this changes, algorithm will have to be reworked because this
 * depends on completely exhausting the VLAN identifier space.  Thus
 * it gives constant time look-up, but in many cases it wastes memory.
 */
#define VLAN_GROUP_ARRAY_LEN          4096
#define VLAN_GROUP_ARRAY_SPLIT_PARTS  8
#define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)

struct vlan_group {
	int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
	unsigned int		nr_vlans;
	struct hlist_node	hlist;	/* linked list */
	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
	struct rcu_head		rcu;
};

static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
						       unsigned int vlan_id)
{
	struct net_device **array;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
}

static inline void vlan_group_set_device(struct vlan_group *vg,
					 unsigned int vlan_id,
					 struct net_device *dev)
{
	struct net_device **array;
	if (!vg)
		return;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
}

struct vlan_priority_tci_mapping {
	u32 priority;
	unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
				  * at provisioning time.
				  * ((skb->priority << 13) & 0xE000)
				  */
	struct vlan_priority_tci_mapping *next;
};

/* Holds information that makes sense if this device is a VLAN device. */
struct vlan_dev_info {
	/** This will be the mapping that correlates skb->priority to
	 * 3 bits of VLAN QOS tags...
	 */
	unsigned int nr_ingress_mappings;
	u32 ingress_priority_map[8];

	unsigned int nr_egress_mappings;
	struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */

	unsigned short vlan_id;        /*  The VLAN Identifier for this interface. */
	unsigned short flags;          /* (1 << 0) re_order_header   This option will cause the
                                        *   VLAN code to move around the ethernet header on
                                        *   ingress to make the skb look **exactly** like it
                                        *   came in from an ethernet port.  This destroys some of
                                        *   the VLAN information in the skb, but it fixes programs
                                        *   like DHCP that use packet-filtering and don't understand
                                        *   802.1Q
                                        */
	struct net_device *real_dev;    /* the underlying device/interface */
	unsigned char real_dev_addr[ETH_ALEN];
	struct proc_dir_entry *dent;    /* Holds the proc data */
	unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
	unsigned long cnt_encap_on_xmit;      /* How many times did we have to encapsulate the skb on TX. */
};

#define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv))

/* inline functions */
static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
					      unsigned short vlan_tag)
{
	struct vlan_dev_info *vip = VLAN_DEV_INFO(dev);

	return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
}

/* VLAN tx hw acceleration helpers. */
struct vlan_skb_tx_cookie {
	u32	magic;
	u32	vlan_tag;
};

#define VLAN_TX_COOKIE_MAGIC	0x564c414e	/* "VLAN" in ascii. */
#define VLAN_TX_SKB_CB(__skb)	((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
#define vlan_tx_tag_present(__skb) \
	(VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
#define vlan_tx_tag_get(__skb)	(VLAN_TX_SKB_CB(__skb)->vlan_tag)

/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
				    struct vlan_group *grp,
				    unsigned short vlan_tag, int polling)
{
	struct net_device_stats *stats;

	if (skb_bond_should_drop(skb)) {
		dev_kfree_skb_any(skb);
		return NET_RX_DROP;
	}

	skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
	if (skb->dev == NULL) {
		dev_kfree_skb_any(skb);

		/* Not NET_RX_DROP, this is not being dropped
		 * due to congestion.
		 */
		return 0;
	}

	skb->dev->last_rx = jiffies;

	stats = &skb->dev->stats;
	stats->rx_packets++;
	stats->rx_bytes += skb->len;

	skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
	switch (skb->pkt_type) {
	case PACKET_BROADCAST:
		break;

	case PACKET_MULTICAST:
		stats->multicast++;
		break;

	case PACKET_OTHERHOST:
		/* Our lower layer thinks this is not local, let's make sure.
		 * This allows the VLAN to have a different MAC than the underlying
		 * device, and still route correctly.
		 */
		if (!compare_ether_addr(eth_hdr(skb)->h_dest,
				       	skb->dev->dev_addr))
			skb->pkt_type = PACKET_HOST;
		break;
	};

	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
}

static inline int vlan_hwaccel_rx(struct sk_buff *skb,
				  struct vlan_group *grp,
				  unsigned short vlan_tag)
{
	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
}

static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
					   struct vlan_group *grp,
					   unsigned short vlan_tag)
{
	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
}

/**
 * __vlan_put_tag - regular VLAN tag inserting
 * @skb: skbuff to tag
 * @tag: VLAN tag 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, unsigned short tag)
{
	struct vlan_ethhdr *veth;

	if (skb_headroom(skb) < VLAN_HLEN) {
		struct sk_buff *sk_tmp = skb;
		skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
		kfree_skb(sk_tmp);
		if (!skb) {
			printk(KERN_ERR "vlan: failed to realloc headroom\n");
			return NULL;
		}
	} else {
		skb = skb_unshare(skb, GFP_ATOMIC);
		if (!skb) {
			printk(KERN_ERR "vlan: failed to unshare skbuff\n");
			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);

	/* first, the ethernet type */
	veth->h_vlan_proto = __constant_htons(ETH_P_8021Q);

	/* now, the tag */
	veth->h_vlan_TCI = htons(tag);

	skb->protocol = __constant_htons(ETH_P_8021Q);
	skb->mac_header -= VLAN_HLEN;
	skb->network_header -= VLAN_HLEN;

	return skb;
}

/**
 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
 * @skb: skbuff to tag
 * @tag: VLAN tag to insert
 *
 * Puts the VLAN tag in @skb->cb[] and lets the device do the rest
 */
static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag)
{
	struct vlan_skb_tx_cookie *cookie;

	cookie = VLAN_TX_SKB_CB(skb);
	cookie->magic = VLAN_TX_COOKIE_MAGIC;
	cookie->vlan_tag = tag;

	return skb;
}

#define HAVE_VLAN_PUT_TAG

/**
 * vlan_put_tag - inserts VLAN tag according to device features
 * @skb: skbuff to tag
 * @tag: VLAN tag 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, unsigned short tag)
{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
		return __vlan_hwaccel_put_tag(skb, tag);
	} else {
		return __vlan_put_tag(skb, tag);
	}
}

/**
 * __vlan_get_tag - get the VLAN ID that is part of the payload
 * @skb: skbuff to query
 * @tag: buffer to store vlaue
 * 
 * Returns error if the skb is not of VLAN type
 */
static inline int __vlan_get_tag(struct sk_buff *skb, unsigned short *tag)
{
	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;

	if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
		return -EINVAL;
	}

	*tag = ntohs(veth->h_vlan_TCI);

	return 0;
}

/**
 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
 * @skb: skbuff to query
 * @tag: buffer to store vlaue
 * 
 * Returns error if @skb->cb[] is not set correctly
 */
static inline int __vlan_hwaccel_get_tag(struct sk_buff *skb, unsigned short *tag)
{
	struct vlan_skb_tx_cookie *cookie;

	cookie = VLAN_TX_SKB_CB(skb);
	if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
		*tag = cookie->vlan_tag;
		return 0;
	} else {
		*tag = 0;
		return -EINVAL;
	}
}

#define HAVE_VLAN_GET_TAG

/**
 * vlan_get_tag - get the VLAN ID from the skb
 * @skb: skbuff to query
 * @tag: buffer to store vlaue
 * 
 * Returns error if the skb is not VLAN tagged
 */
static inline int vlan_get_tag(struct sk_buff *skb, unsigned short *tag)
{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
		return __vlan_hwaccel_get_tag(skb, tag);
	} else {
		return __vlan_get_tag(skb, tag);
	}
}

#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,
};

enum vlan_name_types {
	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like:  vlan0005 */
	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like:  eth1.0005 */
	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like:  vlan5 */
	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like:  eth0.5 */
	VLAN_NAME_TYPE_HIGHEST
};

struct vlan_ioctl_args {
	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	char device1[24];

        union {
		char device2[24];
		int VID;
		unsigned int skb_priority;
		unsigned int name_type;
		unsigned int bind_type;
		unsigned int flag; /* Matches vlan_dev_info flags */
        } u;

	short vlan_qos;   
};

#endif /* !(_LINUX_IF_VLAN_H_) */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* VLAN An implementation of 802.1Q VLAN tagging.
	3	*
	4	* Authors: Ben Greear <greearb@candelatech.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*
	11	*/
	12
	13	#ifndef _LINUX_IF_VLAN_H_
	14	#define _LINUX_IF_VLAN_H_
	15
	16	#ifdef __KERNEL__
	17
	18	/* externally defined structs */
1da177e4 LT	19	struct hlist_node;
1da177e4 LT	20
1da177e4	21	#include <linux/netdevice.h>
0610d11b	22	#include <linux/etherdevice.h>
1da177e4 LT	23
	24	#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
	25	* that VLAN requires.
	26	*/
	27	#define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
	28	#define VLAN_ETH_HLEN 18 /* Total octets in header. */
	29	#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
	30
	31	/*
	32	* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
	33	*/
	34	#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
	35	#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
	36
740c15d0 PM	37	/*
	38	* struct vlan_hdr - vlan header
	39	* @h_vlan_TCI: priority and VLAN ID
	40	* @h_vlan_encapsulated_proto: packet type ID or len
	41	*/
	42	struct vlan_hdr {
	43	__be16 h_vlan_TCI;
	44	__be16 h_vlan_encapsulated_proto;
	45	};
	46
	47	/**
	48	* struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
	49	* @h_dest: destination ethernet address
	50	* @h_source: source ethernet address
	51	* @h_vlan_proto: ethernet protocol (always 0x8100)
	52	* @h_vlan_TCI: priority and VLAN ID
	53	* @h_vlan_encapsulated_proto: packet type ID or len
	54	*/
1da177e4	55	struct vlan_ethhdr {
740c15d0 PM	56	unsigned char h_dest[ETH_ALEN];
	57	unsigned char h_source[ETH_ALEN];
	58	__be16 h_vlan_proto;
	59	__be16 h_vlan_TCI;
	60	__be16 h_vlan_encapsulated_proto;
1da177e4 LT	61	};
	62
	63	#include <linux/skbuff.h>
	64
	65	static inline struct vlan_ethhdr vlan_eth_hdr(const struct sk_buff skb)
	66	{
98e399f8	67	return (struct vlan_ethhdr *)skb_mac_header(skb);
1da177e4 LT	68	}
1da177e4 LT	69
1da177e4 LT	70	#define VLAN_VID_MASK 0xfff
	71
	72	/* found in socket.c */
881d966b	73	extern void vlan_ioctl_set(int (hook)(struct net , void __user *));
1da177e4	74
1da177e4 LT	75	/* if this changes, algorithm will have to be reworked because this
	76	* depends on completely exhausting the VLAN identifier space. Thus
	77	* it gives constant time look-up, but in many cases it wastes memory.
	78	*/
5c15bdec DA	79	#define VLAN_GROUP_ARRAY_LEN 4096
	80	#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
	81	#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)
1da177e4 LT	82
	83	struct vlan_group {
	84	int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
af301517	85	unsigned int nr_vlans;
1da177e4	86	struct hlist_node hlist; /* linked list */
5c15bdec	87	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
1da177e4 LT	88	struct rcu_head rcu;
	89	};
	90
f0b5a0dc ED	91	static inline struct net_device vlan_group_get_device(struct vlan_group vg,
f0b5a0dc ED	92	unsigned int vlan_id)
5c15bdec DA	93	{
	94	struct net_device **array;
	95	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	96	return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
	97	}
	98
f0b5a0dc ED	99	static inline void vlan_group_set_device(struct vlan_group *vg,
f0b5a0dc ED	100	unsigned int vlan_id,
5c15bdec DA	101	struct net_device *dev)
	102	{
	103	struct net_device **array;
	104	if (!vg)
	105	return;
	106	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	107	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
	108	}
	109
1da177e4	110	struct vlan_priority_tci_mapping {
734423cf	111	u32 priority;
1da177e4 LT	112	unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
	113	* at provisioning time.
	114	* ((skb->priority << 13) & 0xE000)
	115	*/
	116	struct vlan_priority_tci_mapping *next;
	117	};
	118
	119	/* Holds information that makes sense if this device is a VLAN device. */
	120	struct vlan_dev_info {
	121	/** This will be the mapping that correlates skb->priority to
	122	* 3 bits of VLAN QOS tags...
	123	*/
b020cb48	124	unsigned int nr_ingress_mappings;
734423cf	125	u32 ingress_priority_map[8];
b020cb48 PM	126
b020cb48 PM	127	unsigned int nr_egress_mappings;
1da177e4 LT	128	struct vlan_priority_tci_mapping egress_priority_map[16]; / hash table */
	129
	130	unsigned short vlan_id; /* The VLAN Identifier for this interface. */
	131	unsigned short flags; /* (1 << 0) re_order_header This option will cause the
	132	* VLAN code to move around the ethernet header on
	133	* ingress to make the skb look exactly like it
	134	* came in from an ethernet port. This destroys some of
	135	* the VLAN information in the skb, but it fixes programs
	136	* like DHCP that use packet-filtering and don't understand
	137	* 802.1Q
	138	*/
1da177e4	139	struct net_device real_dev; / the underlying device/interface */
8c979c26	140	unsigned char real_dev_addr[ETH_ALEN];
1da177e4 LT	141	struct proc_dir_entry dent; / Holds the proc data */
	142	unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
	143	unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */
1da177e4 LT	144	};
	145
	146	#define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv))
	147
	148	/* inline functions */
1da177e4 LT	149	static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
	150	unsigned short vlan_tag)
	151	{
	152	struct vlan_dev_info *vip = VLAN_DEV_INFO(dev);
	153
	154	return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
	155	}
	156
	157	/* VLAN tx hw acceleration helpers. */
	158	struct vlan_skb_tx_cookie {
	159	u32 magic;
	160	u32 vlan_tag;
	161	};
	162
	163	#define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */
	164	#define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
	165	#define vlan_tx_tag_present(__skb) \
	166	(VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
	167	#define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag)
	168
	169	/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
	170	static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
	171	struct vlan_group *grp,
	172	unsigned short vlan_tag, int polling)
	173	{
	174	struct net_device_stats *stats;
	175
7ea49ed7 DM	176	if (skb_bond_should_drop(skb)) {
	177	dev_kfree_skb_any(skb);
	178	return NET_RX_DROP;
	179	}
	180
5c15bdec	181	skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
1da177e4 LT	182	if (skb->dev == NULL) {
	183	dev_kfree_skb_any(skb);
	184
	185	/* Not NET_RX_DROP, this is not being dropped
	186	* due to congestion.
	187	*/
	188	return 0;
	189	}
	190
	191	skb->dev->last_rx = jiffies;
	192
7bd38d77	193	stats = &skb->dev->stats;
1da177e4 LT	194	stats->rx_packets++;
	195	stats->rx_bytes += skb->len;
	196
	197	skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
	198	switch (skb->pkt_type) {
	199	case PACKET_BROADCAST:
	200	break;
	201
	202	case PACKET_MULTICAST:
	203	stats->multicast++;
	204	break;
	205
	206	case PACKET_OTHERHOST:
	207	/* Our lower layer thinks this is not local, let's make sure.
	208	* This allows the VLAN to have a different MAC than the underlying
	209	* device, and still route correctly.
	210	*/
0610d11b SH	211	if (!compare_ether_addr(eth_hdr(skb)->h_dest,
0610d11b SH	212	skb->dev->dev_addr))
1da177e4 LT	213	skb->pkt_type = PACKET_HOST;
	214	break;
	215	};
	216
	217	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
	218	}
	219
	220	static inline int vlan_hwaccel_rx(struct sk_buff *skb,
	221	struct vlan_group *grp,
	222	unsigned short vlan_tag)
	223	{
	224	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
	225	}
	226
	227	static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
	228	struct vlan_group *grp,
	229	unsigned short vlan_tag)
	230	{
	231	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
	232	}
	233
	234	/**
	235	* __vlan_put_tag - regular VLAN tag inserting
	236	* @skb: skbuff to tag
	237	* @tag: VLAN tag to insert
	238	*
	239	* Inserts the VLAN tag into @skb as part of the payload
	240	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	241	*
	242	* Following the skb_unshare() example, in case of error, the calling function
	243	* doesn't have to worry about freeing the original skb.
	244	*/
	245	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, unsigned short tag)
	246	{
	247	struct vlan_ethhdr *veth;
	248
	249	if (skb_headroom(skb) < VLAN_HLEN) {
	250	struct sk_buff *sk_tmp = skb;
	251	skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
	252	kfree_skb(sk_tmp);
	253	if (!skb) {
	254	printk(KERN_ERR "vlan: failed to realloc headroom\n");
	255	return NULL;
	256	}
	257	} else {
	258	skb = skb_unshare(skb, GFP_ATOMIC);
	259	if (!skb) {
	260	printk(KERN_ERR "vlan: failed to unshare skbuff\n");
	261	return NULL;
	262	}
	263	}
	264
	265	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	266
	267	/* Move the mac addresses to the beginning of the new header. */
	268	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
	269
	270	/* first, the ethernet type */
	271	veth->h_vlan_proto = __constant_htons(ETH_P_8021Q);
	272
	273	/* now, the tag */
	274	veth->h_vlan_TCI = htons(tag);
	275
	276	skb->protocol = __constant_htons(ETH_P_8021Q);
b0e380b1 ACM	277	skb->mac_header -= VLAN_HLEN;
b0e380b1 ACM	278	skb->network_header -= VLAN_HLEN;
1da177e4 LT	279
	280	return skb;
	281	}
	282
	283	/**
	284	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	285	* @skb: skbuff to tag
	286	* @tag: VLAN tag to insert
	287	*
	288	* Puts the VLAN tag in @skb->cb[] and lets the device do the rest
	289	*/
	290	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb, unsigned short tag)
	291	{
	292	struct vlan_skb_tx_cookie *cookie;
	293
	294	cookie = VLAN_TX_SKB_CB(skb);
	295	cookie->magic = VLAN_TX_COOKIE_MAGIC;
	296	cookie->vlan_tag = tag;
	297
	298	return skb;
	299	}
	300
	301	#define HAVE_VLAN_PUT_TAG
	302
	303	/**
	304	* vlan_put_tag - inserts VLAN tag according to device features
	305	* @skb: skbuff to tag
	306	* @tag: VLAN tag to insert
	307	*
	308	* Assumes skb->dev is the target that will xmit this frame.
	309	* Returns a VLAN tagged skb.
	310	*/
	311	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, unsigned short tag)
	312	{
	313	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
	314	return __vlan_hwaccel_put_tag(skb, tag);
	315	} else {
	316	return __vlan_put_tag(skb, tag);
	317	}
	318	}
	319
	320	/**
	321	* __vlan_get_tag - get the VLAN ID that is part of the payload
	322	* @skb: skbuff to query
	323	* @tag: buffer to store vlaue
	324	*
	325	* Returns error if the skb is not of VLAN type
	326	*/
	327	static inline int __vlan_get_tag(struct sk_buff skb, unsigned short tag)
	328	{
	329	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	330
	331	if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
	332	return -EINVAL;
	333	}
	334
	335	*tag = ntohs(veth->h_vlan_TCI);
	336
	337	return 0;
	338	}
	339
	340	/**
	341	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	342	* @skb: skbuff to query
343	* @tag: buffer to store vlaue
344	*
345	* Returns error if @skb->cb[] is not set correctly
346	*/
347	static inline int __vlan_hwaccel_get_tag(struct sk_buff skb, unsigned short tag)
348	{
349	struct vlan_skb_tx_cookie *cookie;
350
351	cookie = VLAN_TX_SKB_CB(skb);
352	if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
353	*tag = cookie->vlan_tag;
354	return 0;
355	} else {
356	*tag = 0;
357	return -EINVAL;
358	}
359	}
360
361	#define HAVE_VLAN_GET_TAG
362
363	/**
364	* vlan_get_tag - get the VLAN ID from the skb
365	* @skb: skbuff to query
366	* @tag: buffer to store vlaue
367	*
368	* Returns error if the skb is not VLAN tagged
369	*/
370	static inline int vlan_get_tag(struct sk_buff skb, unsigned short tag)
371	{
372	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
373	return __vlan_hwaccel_get_tag(skb, tag);
374	} else {
375	return __vlan_get_tag(skb, tag);
376	}
377	}
378
379	#endif /* __KERNEL__ */
380
381	/* VLAN IOCTLs are found in sockios.h */
382
383	/* Passed in vlan_ioctl_args structure to determine behaviour. */
384	enum vlan_ioctl_cmds {
385	ADD_VLAN_CMD,
386	DEL_VLAN_CMD,
387	SET_VLAN_INGRESS_PRIORITY_CMD,
388	SET_VLAN_EGRESS_PRIORITY_CMD,
389	GET_VLAN_INGRESS_PRIORITY_CMD,
390	GET_VLAN_EGRESS_PRIORITY_CMD,
391	SET_VLAN_NAME_TYPE_CMD,
392	SET_VLAN_FLAG_CMD,
393	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
394	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
395	};
396
a4bf3af4 PM	397	enum vlan_flags {
	398	VLAN_FLAG_REORDER_HDR = 0x1,
	399	};
	400
1da177e4 LT	401	enum vlan_name_types {
	402	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
	403	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
	404	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
	405	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
	406	VLAN_NAME_TYPE_HIGHEST
	407	};
	408
	409	struct vlan_ioctl_args {
	410	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	411	char device1[24];
	412
	413	union {
	414	char device2[24];
	415	int VID;
	416	unsigned int skb_priority;
	417	unsigned int name_type;
	418	unsigned int bind_type;
	419	unsigned int flag; /* Matches vlan_dev_info flags */
	420	} u;
	421
	422	short vlan_qos;
	423	};
	424
	425	#endif /* !(_LINUX_IF_VLAN_H_) */