[mirror_ubuntu-zesty-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_

#ifdef __KERNEL__

/* externally defined structs */
struct vlan_group;
struct net_device;
struct packet_type;
struct vlan_collection;
struct vlan_dev_info;
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_ethhdr {
   unsigned char	h_dest[ETH_ALEN];	   /* destination eth addr	*/
   unsigned char	h_source[ETH_ALEN];	   /* source ether addr	*/
   __be16               h_vlan_proto;              /* Should always be 0x8100 */
   __be16               h_vlan_TCI;                /* Encapsulates priority and VLAN ID */
   __be16		h_vlan_encapsulated_proto; /* packet type ID field (or len) */
};

#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);
}

struct vlan_hdr {
   __be16               h_vlan_TCI;                /* Encapsulates priority and VLAN ID */
   __be16               h_vlan_encapsulated_proto; /* packet type ID field (or len) */
};

#define VLAN_VID_MASK	0xfff

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

#define VLAN_NAME "vlan"

/* 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. */
	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, 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, 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 {
	unsigned long 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 long ingress_priority_map[8];
	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 dev_mc_list *old_mc_list;  /* old multi-cast list for the VLAN interface..
                                           * we save this so we can tell what changes were
                                           * made, in order to feed the right changes down
                                           * to the real hardware...
                                           */
	int old_allmulti;               /* similar to above. */
	int old_promiscuity;            /* similar to above. */
	struct net_device *real_dev;    /* the underlying device/interface */
	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. */
	struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */
};

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

/* inline functions */

static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
{
	return &(VLAN_DEV_INFO(dev)->dev_stats);
}

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 = vlan_dev_get_stats(skb->dev);
	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_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 */
	19	struct vlan_group;
	20	struct net_device;
	21	struct packet_type;
	22	struct vlan_collection;
	23	struct vlan_dev_info;
	24	struct hlist_node;
	25
1da177e4	26	#include <linux/netdevice.h>
0610d11b	27	#include <linux/etherdevice.h>
1da177e4 LT	28
	29	#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
	30	* that VLAN requires.
	31	*/
	32	#define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
	33	#define VLAN_ETH_HLEN 18 /* Total octets in header. */
	34	#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
	35
	36	/*
	37	* According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
	38	*/
	39	#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
	40	#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
	41
	42	struct vlan_ethhdr {
	43	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
	44	unsigned char h_source[ETH_ALEN]; /* source ether addr */
3c3f8f25 AD	45	__be16 h_vlan_proto; /* Should always be 0x8100 */
3c3f8f25 AD	46	__be16 h_vlan_TCI; /* Encapsulates priority and VLAN ID */
d136fe72	47	__be16 h_vlan_encapsulated_proto; /* packet type ID field (or len) */
1da177e4 LT	48	};
	49
	50	#include <linux/skbuff.h>
	51
	52	static inline struct vlan_ethhdr vlan_eth_hdr(const struct sk_buff skb)
	53	{
98e399f8	54	return (struct vlan_ethhdr *)skb_mac_header(skb);
1da177e4 LT	55	}
	56
	57	struct vlan_hdr {
3c3f8f25 AD	58	__be16 h_vlan_TCI; /* Encapsulates priority and VLAN ID */
3c3f8f25 AD	59	__be16 h_vlan_encapsulated_proto; /* packet type ID field (or len) */
1da177e4 LT	60	};
	61
	62	#define VLAN_VID_MASK 0xfff
	63
	64	/* found in socket.c */
	65	extern void vlan_ioctl_set(int (hook)(void __user ));
	66
	67	#define VLAN_NAME "vlan"
	68
	69	/* if this changes, algorithm will have to be reworked because this
	70	* depends on completely exhausting the VLAN identifier space. Thus
	71	* it gives constant time look-up, but in many cases it wastes memory.
	72	*/
5c15bdec DA	73	#define VLAN_GROUP_ARRAY_LEN 4096
	74	#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
	75	#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)
1da177e4 LT	76
	77	struct vlan_group {
	78	int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
	79	struct hlist_node hlist; /* linked list */
5c15bdec	80	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
1da177e4 LT	81	struct rcu_head rcu;
	82	};
	83
5c15bdec DA	84	static inline struct net_device vlan_group_get_device(struct vlan_group vg, int vlan_id)
	85	{
	86	struct net_device **array;
	87	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	88	return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
	89	}
	90
	91	static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id,
	92	struct net_device *dev)
	93	{
	94	struct net_device **array;
	95	if (!vg)
	96	return;
	97	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	98	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
	99	}
	100
1da177e4 LT	101	struct vlan_priority_tci_mapping {
	102	unsigned long priority;
	103	unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
	104	* at provisioning time.
	105	* ((skb->priority << 13) & 0xE000)
	106	*/
	107	struct vlan_priority_tci_mapping *next;
	108	};
	109
	110	/* Holds information that makes sense if this device is a VLAN device. */
	111	struct vlan_dev_info {
	112	/** This will be the mapping that correlates skb->priority to
	113	* 3 bits of VLAN QOS tags...
	114	*/
	115	unsigned long ingress_priority_map[8];
	116	struct vlan_priority_tci_mapping egress_priority_map[16]; / hash table */
	117
	118	unsigned short vlan_id; /* The VLAN Identifier for this interface. */
	119	unsigned short flags; /* (1 << 0) re_order_header This option will cause the
	120	* VLAN code to move around the ethernet header on
	121	* ingress to make the skb look exactly like it
	122	* came in from an ethernet port. This destroys some of
	123	* the VLAN information in the skb, but it fixes programs
	124	* like DHCP that use packet-filtering and don't understand
	125	* 802.1Q
	126	*/
	127	struct dev_mc_list old_mc_list; / old multi-cast list for the VLAN interface..
	128	* we save this so we can tell what changes were
	129	* made, in order to feed the right changes down
	130	* to the real hardware...
	131	*/
	132	int old_allmulti; /* similar to above. */
	133	int old_promiscuity; /* similar to above. */
	134	struct net_device real_dev; / the underlying device/interface */
	135	struct proc_dir_entry dent; / Holds the proc data */
	136	unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */
	137	unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */
	138	struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */
	139	};
	140
	141	#define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv))
	142
	143	/* inline functions */
	144
	145	static inline struct net_device_stats vlan_dev_get_stats(struct net_device dev)
	146	{
	147	return &(VLAN_DEV_INFO(dev)->dev_stats);
	148	}
	149
	150	static inline __u32 vlan_get_ingress_priority(struct net_device *dev,
	151	unsigned short vlan_tag)
	152	{
	153	struct vlan_dev_info *vip = VLAN_DEV_INFO(dev);
	154
	155	return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7];
	156	}
	157
	158	/* VLAN tx hw acceleration helpers. */
	159	struct vlan_skb_tx_cookie {
	160	u32 magic;
	161	u32 vlan_tag;
	162	};
	163
	164	#define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */
165	#define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
166	#define vlan_tx_tag_present(__skb) \
167	(VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
168	#define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag)
169
170	/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
171	static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
172	struct vlan_group *grp,
173	unsigned short vlan_tag, int polling)
174	{
175	struct net_device_stats *stats;
176
7ea49ed7 DM	177	if (skb_bond_should_drop(skb)) {
	178	dev_kfree_skb_any(skb);
	179	return NET_RX_DROP;
	180	}
	181
5c15bdec	182	skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
1da177e4 LT	183	if (skb->dev == NULL) {
	184	dev_kfree_skb_any(skb);
	185
	186	/* Not NET_RX_DROP, this is not being dropped
	187	* due to congestion.
	188	*/
	189	return 0;
	190	}
	191
	192	skb->dev->last_rx = jiffies;
	193
	194	stats = vlan_dev_get_stats(skb->dev);
	195	stats->rx_packets++;
	196	stats->rx_bytes += skb->len;
	197
	198	skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
	199	switch (skb->pkt_type) {
	200	case PACKET_BROADCAST:
	201	break;
	202
	203	case PACKET_MULTICAST:
	204	stats->multicast++;
	205	break;
	206
	207	case PACKET_OTHERHOST:
	208	/* Our lower layer thinks this is not local, let's make sure.
	209	* This allows the VLAN to have a different MAC than the underlying
	210	* device, and still route correctly.
	211	*/
0610d11b SH	212	if (!compare_ether_addr(eth_hdr(skb)->h_dest,
0610d11b SH	213	skb->dev->dev_addr))
1da177e4 LT	214	skb->pkt_type = PACKET_HOST;
	215	break;
	216	};
	217
	218	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
	219	}
	220
	221	static inline int vlan_hwaccel_rx(struct sk_buff *skb,
	222	struct vlan_group *grp,
	223	unsigned short vlan_tag)
	224	{
	225	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
	226	}
	227
	228	static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
	229	struct vlan_group *grp,
	230	unsigned short vlan_tag)
	231	{
	232	return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
	233	}
	234
	235	/**
	236	* __vlan_put_tag - regular VLAN tag inserting
	237	* @skb: skbuff to tag
	238	* @tag: VLAN tag to insert
	239	*
	240	* Inserts the VLAN tag into @skb as part of the payload
	241	* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
	242	*
	243	* Following the skb_unshare() example, in case of error, the calling function
	244	* doesn't have to worry about freeing the original skb.
	245	*/
	246	static inline struct sk_buff __vlan_put_tag(struct sk_buff skb, unsigned short tag)
	247	{
	248	struct vlan_ethhdr *veth;
	249
	250	if (skb_headroom(skb) < VLAN_HLEN) {
	251	struct sk_buff *sk_tmp = skb;
	252	skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
	253	kfree_skb(sk_tmp);
	254	if (!skb) {
	255	printk(KERN_ERR "vlan: failed to realloc headroom\n");
	256	return NULL;
	257	}
	258	} else {
	259	skb = skb_unshare(skb, GFP_ATOMIC);
	260	if (!skb) {
	261	printk(KERN_ERR "vlan: failed to unshare skbuff\n");
	262	return NULL;
	263	}
	264	}
	265
	266	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
	267
	268	/* Move the mac addresses to the beginning of the new header. */
	269	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
	270
	271	/* first, the ethernet type */
	272	veth->h_vlan_proto = __constant_htons(ETH_P_8021Q);
	273
	274	/* now, the tag */
	275	veth->h_vlan_TCI = htons(tag);
	276
	277	skb->protocol = __constant_htons(ETH_P_8021Q);
b0e380b1 ACM	278	skb->mac_header -= VLAN_HLEN;
b0e380b1 ACM	279	skb->network_header -= VLAN_HLEN;
1da177e4 LT	280
	281	return skb;
	282	}
	283
	284	/**
	285	* __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
	286	* @skb: skbuff to tag
	287	* @tag: VLAN tag to insert
	288	*
	289	* Puts the VLAN tag in @skb->cb[] and lets the device do the rest
	290	*/
	291	static inline struct sk_buff __vlan_hwaccel_put_tag(struct sk_buff skb, unsigned short tag)
	292	{
	293	struct vlan_skb_tx_cookie *cookie;
	294
	295	cookie = VLAN_TX_SKB_CB(skb);
	296	cookie->magic = VLAN_TX_COOKIE_MAGIC;
	297	cookie->vlan_tag = tag;
	298
	299	return skb;
	300	}
	301
	302	#define HAVE_VLAN_PUT_TAG
	303
	304	/**
	305	* vlan_put_tag - inserts VLAN tag according to device features
	306	* @skb: skbuff to tag
	307	* @tag: VLAN tag to insert
	308	*
	309	* Assumes skb->dev is the target that will xmit this frame.
	310	* Returns a VLAN tagged skb.
	311	*/
	312	static inline struct sk_buff vlan_put_tag(struct sk_buff skb, unsigned short tag)
	313	{
	314	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
	315	return __vlan_hwaccel_put_tag(skb, tag);
	316	} else {
	317	return __vlan_put_tag(skb, tag);
	318	}
	319	}
	320
	321	/**
	322	* __vlan_get_tag - get the VLAN ID that is part of the payload
	323	* @skb: skbuff to query
	324	* @tag: buffer to store vlaue
	325	*
	326	* Returns error if the skb is not of VLAN type
	327	*/
	328	static inline int __vlan_get_tag(struct sk_buff skb, unsigned short tag)
	329	{
	330	struct vlan_ethhdr veth = (struct vlan_ethhdr )skb->data;
	331
	332	if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
	333	return -EINVAL;
	334	}
	335
	336	*tag = ntohs(veth->h_vlan_TCI);
	337
	338	return 0;
	339	}
	340
	341	/**
	342	* __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
	343	* @skb: skbuff to query
344	* @tag: buffer to store vlaue
345	*
346	* Returns error if @skb->cb[] is not set correctly
347	*/
348	static inline int __vlan_hwaccel_get_tag(struct sk_buff skb, unsigned short tag)
349	{
350	struct vlan_skb_tx_cookie *cookie;
351
352	cookie = VLAN_TX_SKB_CB(skb);
353	if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
354	*tag = cookie->vlan_tag;
355	return 0;
356	} else {
357	*tag = 0;
358	return -EINVAL;
359	}
360	}
361
362	#define HAVE_VLAN_GET_TAG
363
364	/**
365	* vlan_get_tag - get the VLAN ID from the skb
366	* @skb: skbuff to query
367	* @tag: buffer to store vlaue
368	*
369	* Returns error if the skb is not VLAN tagged
370	*/
371	static inline int vlan_get_tag(struct sk_buff skb, unsigned short tag)
372	{
373	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
374	return __vlan_hwaccel_get_tag(skb, tag);
375	} else {
376	return __vlan_get_tag(skb, tag);
377	}
378	}
379
380	#endif /* __KERNEL__ */
381
382	/* VLAN IOCTLs are found in sockios.h */
383
384	/* Passed in vlan_ioctl_args structure to determine behaviour. */
385	enum vlan_ioctl_cmds {
386	ADD_VLAN_CMD,
387	DEL_VLAN_CMD,
388	SET_VLAN_INGRESS_PRIORITY_CMD,
389	SET_VLAN_EGRESS_PRIORITY_CMD,
390	GET_VLAN_INGRESS_PRIORITY_CMD,
391	GET_VLAN_EGRESS_PRIORITY_CMD,
392	SET_VLAN_NAME_TYPE_CMD,
393	SET_VLAN_FLAG_CMD,
394	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
395	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
396	};
397
398	enum vlan_name_types {
399	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
400	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
401	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
402	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
403	VLAN_NAME_TYPE_HIGHEST
404	};
405
406	struct vlan_ioctl_args {
407	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
408	char device1[24];
409
410	union {
411	char device2[24];
412	int VID;
413	unsigned int skb_priority;
414	unsigned int name_type;
415	unsigned int bind_type;
416	unsigned int flag; /* Matches vlan_dev_info flags */
417	} u;
418
419	short vlan_qos;
420	};
421
422	#endif /* !(_LINUX_IF_VLAN_H_) */