include/linux/if_tap.h

Source file repositories/reference/linux-study-clean/include/linux/if_tap.h

File Facts

System
Linux kernel
Corpus path
include/linux/if_tap.h
Extension
.h
Size
2267 bytes
Lines
86
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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_*/

Annotation

Implementation Notes