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635b8c8e SG |
1 | #ifndef _LINUX_IF_TAP_H_ |
2 | #define _LINUX_IF_TAP_H_ | |
3 | ||
9a393b5d | 4 | #if IS_ENABLED(CONFIG_TAP) |
635b8c8e SG |
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 | } | |
9a393b5d | 15 | #endif /* CONFIG_TAP */ |
635b8c8e | 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 | 67 | void tap_del_queues(struct tap_dev *tap); |
d9f1f61c SG |
68 | int tap_get_minor(dev_t major, struct tap_dev *tap); |
69 | void tap_free_minor(dev_t major, struct tap_dev *tap); | |
6fe3faf8 | 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 | |
75 | #endif /*_LINUX_IF_TAP_H_*/ |