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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_IF_TAP_H_#define _LINUX_IF_TAP_H_
#include <net/sock.h>#include <linux/skb_array.h>
struct file;struct socket;
#if IS_ENABLED(CONFIG_TAP)struct socket *tap_get_socket(struct file *);struct ptr_ring *tap_get_ptr_ring(struct file *file);#else#include <linux/err.h>#include <linux/errno.h>static inline struct socket *tap_get_socket(struct file *f){ return ERR_PTR(-EINVAL);}static inline struct ptr_ring *tap_get_ptr_ring(struct file *f){ return ERR_PTR(-EINVAL);}#endif /* CONFIG_TAP */
/* * Maximum times a tap device can be opened. This can be used to * configure the number of receive queue, e.g. for multiqueue virtio. */#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; 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 ptr_ring ring;};
rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);void tap_del_queues(struct tap_dev *tap);int tap_get_minor(dev_t major, struct tap_dev *tap);void tap_free_minor(dev_t major, 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, struct module *module);void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
#endif /*_LINUX_IF_TAP_H_*/