linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 *  TUN - Universal TUN/TAP device driver.

 *  Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>

 *

 *  $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $

 */

​

/*

 *  Changes:

 *

 *  Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14

 *    Add TUNSETLINK ioctl to set the link encapsulation

 *

 *  Mark Smith <markzzzsmith@yahoo.com.au>

 *    Use eth_random_addr() for tap MAC address.

 *

 *  Harald Roelle <harald.roelle@ifi.lmu.de>  2004/04/20

 *    Fixes in packet dropping, queue length setting and queue wakeup.

 *    Increased default tx queue length.

 *    Added ethtool API.

 *    Minor cleanups

 *

 *  Daniel Podlejski <underley@underley.eu.org>

 *    Modifications for 2.3.99-pre5 kernel.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#define DRV_NAME    "tun"

#define DRV_VERSION "1.6"

#define DRV_DESCRIPTION "Universal TUN/TAP device driver"

#define DRV_COPYRIGHT   "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"

​

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/sched/signal.h>

#include <linux/major.h>

#include <linux/slab.h>

#include <linux/poll.h>

#include <linux/fcntl.h>

#include <linux/init.h>

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/miscdevice.h>

#include <linux/ethtool.h>

#include <linux/rtnetlink.h>

#include <linux/compat.h>

#include <linux/if.h>

#include <linux/if_arp.h>

#include <linux/if_ether.h>

#include <linux/if_tun.h>

#include <linux/if_vlan.h>

#include <linux/crc32.h>

#include <linux/nsproxy.h>

#include <linux/virtio_net.h>

#include <linux/rcupdate.h>

#include <net/net_namespace.h>

#include <net/netns/generic.h>

#include <net/rtnetlink.h>

#include <net/sock.h>

#include <net/xdp.h>

#include <linux/seq_file.h>

#include <linux/uio.h>

#include <linux/skb_array.h>

#include <linux/bpf.h>

#include <linux/bpf_trace.h>

#include <linux/mutex.h>

​

#include <linux/uaccess.h>

#include <linux/proc_fs.h>

​

static void tun_default_link_ksettings(struct net_device *dev,

                       struct ethtool_link_ksettings *cmd);

​

/* Uncomment to enable debugging */

/* #define TUN_DEBUG 1 */

​

#ifdef TUN_DEBUG

static int debug;

​

#define tun_debug(level, tun, fmt, args...)         \

do {                                \

    if (tun->debug)                     \

        netdev_printk(level, tun->dev, fmt, ##args);    \

} while (0)

#define DBG1(level, fmt, args...)               \

do {                                \

    if (debug == 2)                     \

        printk(level fmt, ##args);          \