1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_IF_TAP_H_ 3 #define _LINUX_IF_TAP_H_ 4 5 #if IS_ENABLED(CONFIG_TAP) 6 struct socket *tap_get_socket(struct file *); 7 struct skb_array *tap_get_skb_array(struct file *file); 8 #else 9 #include <linux/err.h> 10 #include <linux/errno.h> 11 struct file; 12 struct socket; tap_get_socket(struct file * f)13static inline struct socket *tap_get_socket(struct file *f) 14 { 15 return ERR_PTR(-EINVAL); 16 } tap_get_skb_array(struct file * f)17static inline struct skb_array *tap_get_skb_array(struct file *f) 18 { 19 return ERR_PTR(-EINVAL); 20 } 21 #endif /* CONFIG_TAP */ 22 23 #include <net/sock.h> 24 #include <linux/skb_array.h> 25 26 #define MAX_TAP_QUEUES 256 27 28 struct tap_queue; 29 30 struct tap_dev { 31 struct net_device *dev; 32 u16 flags; 33 /* This array tracks active taps. */ 34 struct tap_queue __rcu *taps[MAX_TAP_QUEUES]; 35 /* This list tracks all taps (both enabled and disabled) */ 36 struct list_head queue_list; 37 int numvtaps; 38 int numqueues; 39 netdev_features_t tap_features; 40 int minor; 41 42 void (*update_features)(struct tap_dev *tap, netdev_features_t features); 43 void (*count_tx_dropped)(struct tap_dev *tap); 44 void (*count_rx_dropped)(struct tap_dev *tap); 45 }; 46 47 /* 48 * A tap queue is the central object of tap module, it connects 49 * an open character device to virtual interface. There can be 50 * multiple queues on one interface, which map back to queues 51 * implemented in hardware on the underlying device. 52 * 53 * tap_proto is used to allocate queues through the sock allocation 54 * mechanism. 55 * 56 */ 57 58 struct tap_queue { 59 struct sock sk; 60 struct socket sock; 61 struct socket_wq wq; 62 int vnet_hdr_sz; 63 struct tap_dev __rcu *tap; 64 struct file *file; 65 unsigned int flags; 66 u16 queue_index; 67 bool enabled; 68 struct list_head next; 69 struct skb_array skb_array; 70 }; 71 72 rx_handler_result_t tap_handle_frame(struct sk_buff **pskb); 73 void tap_del_queues(struct tap_dev *tap); 74 int tap_get_minor(dev_t major, struct tap_dev *tap); 75 void tap_free_minor(dev_t major, struct tap_dev *tap); 76 int tap_queue_resize(struct tap_dev *tap); 77 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major, 78 const char *device_name, struct module *module); 79 void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev); 80 81 #endif /*_LINUX_IF_TAP_H_*/ 82