Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _LINUX_IF_TAP_H_
2#define _LINUX_IF_TAP_H_
3
4#if IS_ENABLED(CONFIG_TAP)
5struct socket *tap_get_socket(struct file *);
6struct skb_array *tap_get_skb_array(struct file *file);
7#else
8#include <linux/err.h>
9#include <linux/errno.h>
10struct file;
11struct socket;
12static inline struct socket *tap_get_socket(struct file *f)
13{
14 return ERR_PTR(-EINVAL);
15}
16static inline struct skb_array *tap_get_skb_array(struct file *f)
17{
18 return ERR_PTR(-EINVAL);
19}
20#endif /* CONFIG_TAP */
21
22#include <net/sock.h>
23#include <linux/skb_array.h>
24
25#define MAX_TAP_QUEUES 256
26
27struct tap_queue;
28
29struct tap_dev {
30 struct net_device *dev;
31 u16 flags;
32 /* This array tracks active taps. */
33 struct tap_queue __rcu *taps[MAX_TAP_QUEUES];
34 /* This list tracks all taps (both enabled and disabled) */
35 struct list_head queue_list;
36 int numvtaps;
37 int numqueues;
38 netdev_features_t tap_features;
39 int minor;
40
41 void (*update_features)(struct tap_dev *tap, netdev_features_t features);
42 void (*count_tx_dropped)(struct tap_dev *tap);
43 void (*count_rx_dropped)(struct tap_dev *tap);
44};
45
46/*
47 * A tap queue is the central object of tap module, it connects
48 * an open character device to virtual interface. There can be
49 * multiple queues on one interface, which map back to queues
50 * implemented in hardware on the underlying device.
51 *
52 * tap_proto is used to allocate queues through the sock allocation
53 * mechanism.
54 *
55 */
56
57struct tap_queue {
58 struct sock sk;
59 struct socket sock;
60 struct socket_wq wq;
61 int vnet_hdr_sz;
62 struct tap_dev __rcu *tap;
63 struct file *file;
64 unsigned int flags;
65 u16 queue_index;
66 bool enabled;
67 struct list_head next;
68 struct skb_array skb_array;
69};
70
71rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
72void tap_del_queues(struct tap_dev *tap);
73int tap_get_minor(dev_t major, struct tap_dev *tap);
74void tap_free_minor(dev_t major, struct tap_dev *tap);
75int tap_queue_resize(struct tap_dev *tap);
76int tap_create_cdev(struct cdev *tap_cdev,
77 dev_t *tap_major, const char *device_name);
78void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
79
80#endif /*_LINUX_IF_TAP_H_*/