cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

if_tap.h (2266B)

      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 ptr_ring *tap_get_ptr_ring(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 ptr_ring *tap_get_ptr_ring(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
     32struct tap_queue;
     33
     34struct 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
     62struct tap_queue {
     63	struct sock sk;
     64	struct socket sock;
     65	int vnet_hdr_sz;
     66	struct tap_dev __rcu *tap;
     67	struct file *file;
     68	unsigned int flags;
     69	u16 queue_index;
     70	bool enabled;
     71	struct list_head next;
     72	struct ptr_ring ring;
     73};
     74
     75rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
     76void tap_del_queues(struct tap_dev *tap);
     77int tap_get_minor(dev_t major, struct tap_dev *tap);
     78void tap_free_minor(dev_t major, struct tap_dev *tap);
     79int tap_queue_resize(struct tap_dev *tap);
     80int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,
     81		    const char *device_name, struct module *module);
     82void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
     83
     84#endif /*_LINUX_IF_TAP_H_*/