LXR linux/include/linux/if

   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)
   6struct socket *tap_get_socket(struct file *);
   7struct skb_array *tap_get_skb_array(struct file *file);
   8#else
   9#include <linux/err.h>
  10#include <linux/errno.h>
  11struct file;
  12struct socket;
  13static inline struct socket *tap_get_socket(struct file *f)
  14{
  15        return ERR_PTR(-EINVAL);
  16}
  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
  28struct tap_queue;
  29
  30struct 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
  58struct 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
  72rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
  73void tap_del_queues(struct tap_dev *tap);
  74int tap_get_minor(dev_t major, struct tap_dev *tap);
  75void tap_free_minor(dev_t major, struct tap_dev *tap);
  76int tap_queue_resize(struct tap_dev *tap);
  77int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,
  78                    const char *device_name, struct module *module);
  79void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
  80
  81#endif /*_LINUX_IF_TAP_H_*/
  82