LXR linux/lib/test

   1/*
   2 * proc sysctl test driver
   3 *
   4 * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the Free
   8 * Software Foundation; either version 2 of the License, or at your option any
   9 * later version; or, when distributed separately from the Linux kernel or
  10 * when incorporated into other software packages, subject to the following
  11 * license:
  12 *
  13 * This program is free software; you can redistribute it and/or modify it
  14 * under the terms of copyleft-next (version 0.3.1 or later) as published
  15 * at http://copyleft-next.org/.
  16 */
  17
  18/*
  19 * This module provides an interface to the proc sysctl interfaces.  This
  20 * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
  21 * system unless explicitly requested by name. You can also build this driver
  22 * into your kernel.
  23 */
  24
  25#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  26
  27#include <linux/init.h>
  28#include <linux/list.h>
  29#include <linux/module.h>
  30#include <linux/printk.h>
  31#include <linux/fs.h>
  32#include <linux/miscdevice.h>
  33#include <linux/slab.h>
  34#include <linux/uaccess.h>
  35#include <linux/async.h>
  36#include <linux/delay.h>
  37#include <linux/vmalloc.h>
  38
  39static int i_zero;
  40static int i_one_hundred = 100;
  41
  42struct test_sysctl_data {
  43        int int_0001;
  44        int int_0002;
  45        int int_0003[4];
  46
  47        int boot_int;
  48
  49        unsigned int uint_0001;
  50
  51        char string_0001[65];
  52
  53#define SYSCTL_TEST_BITMAP_SIZE 65536
  54        unsigned long *bitmap_0001;
  55};
  56
  57static struct test_sysctl_data test_data = {
  58        .int_0001 = 60,
  59        .int_0002 = 1,
  60
  61        .int_0003[0] = 0,
  62        .int_0003[1] = 1,
  63        .int_0003[2] = 2,
  64        .int_0003[3] = 3,
  65
  66        .boot_int = 0,
  67
  68        .uint_0001 = 314,
  69
  70        .string_0001 = "(none)",
  71};
  72
  73/* These are all under /proc/sys/debug/test_sysctl/ */
  74static struct ctl_table test_table[] = {
  75        {
  76                .procname       = "int_0001",
  77                .data           = &test_data.int_0001,
  78                .maxlen         = sizeof(int),
  79                .mode           = 0644,
  80                .proc_handler   = proc_dointvec_minmax,
  81                .extra1         = &i_zero,
  82                .extra2         = &i_one_hundred,
  83        },
  84        {
  85                .procname       = "int_0002",
  86                .data           = &test_data.int_0002,
  87                .maxlen         = sizeof(int),
  88                .mode           = 0644,
  89                .proc_handler   = proc_dointvec,
  90        },
  91        {
  92                .procname       = "int_0003",
  93                .data           = &test_data.int_0003,
  94                .maxlen         = sizeof(test_data.int_0003),
  95                .mode           = 0644,
  96                .proc_handler   = proc_dointvec,
  97        },
  98        {
  99                .procname       = "boot_int",
 100                .data           = &test_data.boot_int,
 101                .maxlen         = sizeof(test_data.boot_int),
 102                .mode           = 0644,
 103                .proc_handler   = proc_dointvec,
 104                .extra1         = SYSCTL_ZERO,
 105                .extra2         = SYSCTL_ONE,
 106        },
 107        {
 108                .procname       = "uint_0001",
 109                .data           = &test_data.uint_0001,
 110                .maxlen         = sizeof(unsigned int),
 111                .mode           = 0644,
 112                .proc_handler   = proc_douintvec,
 113        },
 114        {
 115                .procname       = "string_0001",
 116                .data           = &test_data.string_0001,
 117                .maxlen         = sizeof(test_data.string_0001),
 118                .mode           = 0644,
 119                .proc_handler   = proc_dostring,
 120        },
 121        {
 122                .procname       = "bitmap_0001",
 123                .data           = &test_data.bitmap_0001,
 124                .maxlen         = SYSCTL_TEST_BITMAP_SIZE,
 125                .mode           = 0644,
 126                .proc_handler   = proc_do_large_bitmap,
 127        },
 128        { }
 129};
 130
 131static struct ctl_table test_sysctl_table[] = {
 132        {
 133                .procname       = "test_sysctl",
 134                .maxlen         = 0,
 135                .mode           = 0555,
 136                .child          = test_table,
 137        },
 138        { }
 139};
 140
 141static struct ctl_table test_sysctl_root_table[] = {
 142        {
 143                .procname       = "debug",
 144                .maxlen         = 0,
 145                .mode           = 0555,
 146                .child          = test_sysctl_table,
 147        },
 148        { }
 149};
 150
 151static struct ctl_table_header *test_sysctl_header;
 152
 153static int __init test_sysctl_init(void)
 154{
 155        test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
 156        if (!test_data.bitmap_0001)
 157                return -ENOMEM;
 158        test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
 159        if (!test_sysctl_header) {
 160                kfree(test_data.bitmap_0001);
 161                return -ENOMEM;
 162        }
 163        return 0;
 164}
 165module_init(test_sysctl_init);
 166
 167static void __exit test_sysctl_exit(void)
 168{
 169        kfree(test_data.bitmap_0001);
 170        if (test_sysctl_header)
 171                unregister_sysctl_table(test_sysctl_header);
 172}
 173
 174module_exit(test_sysctl_exit);
 175
 176MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
 177MODULE_LICENSE("GPL");
 178