include/linux/if_tap.h

   1 #ifndef _LINUX_IF_TAP_H_
   2 #define _LINUX_IF_TAP_H_
   3
   4 #if IS_ENABLED(CONFIG_TAP)
   5 struct socket *tap_get_socket(struct file *);
   6 struct skb_array *tap_get_skb_array(struct file *file);
   7 #else
   8 #include <linux/err.h>
   9 #include <linux/errno.h>
  10 struct file;
  11 struct socket;
  12 static inline struct socket *tap_get_socket(struct file *f)
  13 {
  14         return ERR_PTR(-EINVAL);
  15 }
  16 static 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
  27 struct tap_queue;
  28
  29 struct 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
  57 struct 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
  71 rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
  72 void tap_del_queues(struct tap_dev *tap);
  73 int tap_get_minor(dev_t major, struct tap_dev *tap);
  74 void tap_free_minor(dev_t major, struct tap_dev *tap);
  75 int tap_queue_resize(struct tap_dev *tap);
  76 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,
  77                     const char *device_name, struct module *module);
  78 void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
  79
  80 #endif /*_LINUX_IF_TAP_H_*/