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; 13 static inline struct socket *tap_get_socket(struct file *f) 14 { 15 return ERR_PTR(-EINVAL); 16 } 17 static 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 /* 27 * Maximum times a tap device can be opened. This can be used to 28 * configure the number of receive queue, e.g. for multiqueue virtio. 29 */ 30 #define MAX_TAP_QUEUES 256 31 32 struct tap_queue; 33 34 struct tap_dev { 35 struct net_device *dev; 36 u16 flags; 37 /* This array tracks active taps. */ 38 struct tap_queue __rcu *taps[MAX_TAP_QUEUES]; 39 /* This list tracks all taps (both enabled and disabled) */ 40 struct list_head queue_list; 41 int numvtaps; 42 int numqueues; 43 netdev_features_t tap_features; 44 int minor; 45 46 void (*update_features)(struct tap_dev *tap, netdev_features_t features); 47 void (*count_tx_dropped)(struct tap_dev *tap); 48 void (*count_rx_dropped)(struct tap_dev *tap); 49 }; 50 51 /* 52 * A tap queue is the central object of tap module, it connects 53 * an open character device to virtual interface. There can be 54 * multiple queues on one interface, which map back to queues 55 * implemented in hardware on the underlying device. 56 * 57 * tap_proto is used to allocate queues through the sock allocation 58 * mechanism. 59 * 60 */ 61 62 struct tap_queue { 63 struct sock sk; 64 struct socket sock; 65 struct socket_wq wq; 66 int vnet_hdr_sz; 67 struct tap_dev __rcu *tap; 68 struct file *file; 69 unsigned int flags; 70 u16 queue_index; 71 bool enabled; 72 struct list_head next; 73 struct skb_array skb_array; 74 }; 75 76 rx_handler_result_t tap_handle_frame(struct sk_buff **pskb); 77 void tap_del_queues(struct tap_dev *tap); 78 int tap_get_minor(dev_t major, struct tap_dev *tap); 79 void tap_free_minor(dev_t major, struct tap_dev *tap); 80 int tap_queue_resize(struct tap_dev *tap); 81 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major, 82 const char *device_name, struct module *module); 83 void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev); 84 85 #endif /*_LINUX_IF_TAP_H_*/ 86