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

#ifndef _LINUX_IF_TAP_H_
#define _LINUX_IF_TAP_H_

#if IS_ENABLED(CONFIG_MACVTAP)
struct socket *tap_get_socket(struct file *);
#else
#include <linux/err.h>
#include <linux/errno.h>
struct file;
struct socket;
static inline struct socket *tap_get_socket(struct file *f)
{
	return ERR_PTR(-EINVAL);
}
#endif /* CONFIG_MACVTAP */

#include <net/sock.h>
#include <linux/skb_array.h>

#define MAX_TAP_QUEUES 256

struct tap_queue;

struct tap_dev {
	struct net_device	*dev;
	u16			flags;
	/* This array tracks active taps. */
	struct tap_queue    __rcu *taps[MAX_TAP_QUEUES];
	/* This list tracks all taps (both enabled and disabled) */
	struct list_head	queue_list;
	int			numvtaps;
	int			numqueues;
	netdev_features_t	tap_features;
	int			minor;

	void (*update_features)(struct tap_dev *tap, netdev_features_t features);
	void (*count_tx_dropped)(struct tap_dev *tap);
	void (*count_rx_dropped)(struct tap_dev *tap);
};

/*
 * A tap queue is the central object of tap module, it connects
 * an open character device to virtual interface. There can be
 * multiple queues on one interface, which map back to queues
 * implemented in hardware on the underlying device.
 *
 * tap_proto is used to allocate queues through the sock allocation
 * mechanism.
 *
 */

struct tap_queue {
	struct sock sk;
	struct socket sock;
	struct socket_wq wq;
	int vnet_hdr_sz;
	struct tap_dev __rcu *tap;
	struct file *file;
	unsigned int flags;
	u16 queue_index;
	bool enabled;
	struct list_head next;
	struct skb_array skb_array;
};

rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
void tap_del_queues(struct tap_dev *tap);
int tap_get_minor(struct tap_dev *tap);
void tap_free_minor(struct tap_dev *tap);
int tap_queue_resize(struct tap_dev *tap);
int tap_create_cdev(struct cdev *tap_cdev,
		    dev_t *tap_major, const char *device_name);
void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);

#endif /*_LINUX_IF_TAP_H_*/
Commit	Line	Data
635b8c8e SG	1	#ifndef _LINUX_IF_TAP_H_
	2	#define _LINUX_IF_TAP_H_
	3
	4	#if IS_ENABLED(CONFIG_MACVTAP)
	5	struct socket tap_get_socket(struct file );
	6	#else
	7	#include <linux/err.h>
	8	#include <linux/errno.h>
	9	struct file;
	10	struct socket;
	11	static inline struct socket tap_get_socket(struct file f)
	12	{
	13	return ERR_PTR(-EINVAL);
	14	}
	15	#endif /* CONFIG_MACVTAP */
	16
6fe3faf8 SG	17	#include <net/sock.h>
	18	#include <linux/skb_array.h>
	19
	20	#define MAX_TAP_QUEUES 256
	21
	22	struct tap_queue;
	23
	24	struct tap_dev {
	25	struct net_device *dev;
	26	u16 flags;
	27	/* This array tracks active taps. */
	28	struct tap_queue __rcu *taps[MAX_TAP_QUEUES];
	29	/* This list tracks all taps (both enabled and disabled) */
	30	struct list_head queue_list;
	31	int numvtaps;
	32	int numqueues;
	33	netdev_features_t tap_features;
	34	int minor;
	35
	36	void (update_features)(struct tap_dev tap, netdev_features_t features);
	37	void (count_tx_dropped)(struct tap_dev tap);
	38	void (count_rx_dropped)(struct tap_dev tap);
	39	};
	40
	41	/*
	42	* A tap queue is the central object of tap module, it connects
	43	* an open character device to virtual interface. There can be
	44	* multiple queues on one interface, which map back to queues
	45	* implemented in hardware on the underlying device.
	46	*
	47	* tap_proto is used to allocate queues through the sock allocation
	48	* mechanism.
	49	*
	50	*/
	51
	52	struct tap_queue {
	53	struct sock sk;
	54	struct socket sock;
	55	struct socket_wq wq;
	56	int vnet_hdr_sz;
	57	struct tap_dev __rcu *tap;
	58	struct file *file;
	59	unsigned int flags;
	60	u16 queue_index;
	61	bool enabled;
	62	struct list_head next;
	63	struct skb_array skb_array;
	64	};
	65
635b8c8e	66	rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
6fe3faf8 SG	67	void tap_del_queues(struct tap_dev *tap);
	68	int tap_get_minor(struct tap_dev *tap);
	69	void tap_free_minor(struct tap_dev *tap);
	70	int tap_queue_resize(struct tap_dev *tap);
ebc05ba7 SG	71	int tap_create_cdev(struct cdev *tap_cdev,
	72	dev_t tap_major, const char device_name);
	73	void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
635b8c8e SG	74
635b8c8e SG	75	#endif /_LINUX_IF_TAP_H_/