[linux-block.git] / lib / test_sysctl.c

// SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1
/*
 * proc sysctl test driver
 *
 * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
 */

/*
 * This module provides an interface to the proc sysctl interfaces.  This
 * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
 * system unless explicitly requested by name. You can also build this driver
 * into your kernel.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/async.h>
#include <linux/delay.h>
#include <linux/vmalloc.h>

static int i_zero;
static int i_one_hundred = 100;
static int match_int_ok = 1;

struct test_sysctl_data {
	int int_0001;
	int int_0002;
	int int_0003[4];

	int boot_int;

	unsigned int uint_0001;

	char string_0001[65];

#define SYSCTL_TEST_BITMAP_SIZE	65536
	unsigned long *bitmap_0001;
};

static struct test_sysctl_data test_data = {
	.int_0001 = 60,
	.int_0002 = 1,

	.int_0003[0] = 0,
	.int_0003[1] = 1,
	.int_0003[2] = 2,
	.int_0003[3] = 3,

	.boot_int = 0,

	.uint_0001 = 314,

	.string_0001 = "(none)",
};

/* These are all under /proc/sys/debug/test_sysctl/ */
static struct ctl_table test_table[] = {
	{
		.procname	= "int_0001",
		.data		= &test_data.int_0001,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	},
	{
		.procname	= "int_0002",
		.data		= &test_data.int_0002,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "int_0003",
		.data		= &test_data.int_0003,
		.maxlen		= sizeof(test_data.int_0003),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "match_int",
		.data		= &match_int_ok,
		.maxlen		= sizeof(match_int_ok),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "boot_int",
		.data		= &test_data.boot_int,
		.maxlen		= sizeof(test_data.boot_int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= SYSCTL_ZERO,
		.extra2         = SYSCTL_ONE,
	},
	{
		.procname	= "uint_0001",
		.data		= &test_data.uint_0001,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_douintvec,
	},
	{
		.procname	= "string_0001",
		.data		= &test_data.string_0001,
		.maxlen		= sizeof(test_data.string_0001),
		.mode		= 0644,
		.proc_handler	= proc_dostring,
	},
	{
		.procname	= "bitmap_0001",
		.data		= &test_data.bitmap_0001,
		.maxlen		= SYSCTL_TEST_BITMAP_SIZE,
		.mode		= 0644,
		.proc_handler	= proc_do_large_bitmap,
	},
	{ }
};

static struct ctl_table_header *test_sysctl_header;

static int __init test_sysctl_init(void)
{
	int i;

	struct {
		int defined;
		int wanted;
	} match_int[] = {
		{.defined = *(int *)SYSCTL_ZERO,	.wanted = 0},
		{.defined = *(int *)SYSCTL_ONE,		.wanted = 1},
		{.defined = *(int *)SYSCTL_TWO,		.wanted = 2},
		{.defined = *(int *)SYSCTL_THREE,	.wanted = 3},
		{.defined = *(int *)SYSCTL_FOUR,	.wanted = 4},
		{.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100},
		{.defined = *(int *)SYSCTL_TWO_HUNDRED,	.wanted = 200},
		{.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000},
		{.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000},
		{.defined = *(int *)SYSCTL_INT_MAX,	.wanted = INT_MAX},
		{.defined = *(int *)SYSCTL_MAXOLDUID,	.wanted = 65535},
		{.defined = *(int *)SYSCTL_NEG_ONE,	.wanted = -1},
	};

	for (i = 0; i < ARRAY_SIZE(match_int); i++)
		if (match_int[i].defined != match_int[i].wanted)
			match_int_ok = 0;

	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	if (!test_data.bitmap_0001)
		return -ENOMEM;
	test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
	if (!test_sysctl_header) {
		kfree(test_data.bitmap_0001);
		return -ENOMEM;
	}
	return 0;
}
module_init(test_sysctl_init);

static void __exit test_sysctl_exit(void)
{
	kfree(test_data.bitmap_0001);
	if (test_sysctl_header)
		unregister_sysctl_table(test_sysctl_header);
}

module_exit(test_sysctl_exit);

MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
MODULE_LICENSE("GPL");
Commit	Line	Data
6cad1ecd	1	// SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1
9308f2f9 LR	2	/*
	3	* proc sysctl test driver
	4	*
	5	* Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
9308f2f9 LR	6	*/
	7
	8	/*
2d046981	9	* This module provides an interface to the proc sysctl interfaces. This
9308f2f9 LR	10	* driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
	11	* system unless explicitly requested by name. You can also build this driver
	12	* into your kernel.
	13	*/
	14
	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	16
	17	#include <linux/init.h>
	18	#include <linux/list.h>
	19	#include <linux/module.h>
	20	#include <linux/printk.h>
	21	#include <linux/fs.h>
	22	#include <linux/miscdevice.h>
	23	#include <linux/slab.h>
	24	#include <linux/uaccess.h>
	25	#include <linux/async.h>
	26	#include <linux/delay.h>
	27	#include <linux/vmalloc.h>
	28
	29	static int i_zero;
	30	static int i_one_hundred = 100;
57b19468	31	static int match_int_ok = 1;
9308f2f9 LR	32
	33	struct test_sysctl_data {
	34	int int_0001;
eb965eda	35	int int_0002;
7c43a657	36	int int_0003[4];
eb965eda	37
4f2f682d VB	38	int boot_int;
4f2f682d VB	39
2920fad3 LR	40	unsigned int uint_0001;
2920fad3 LR	41
9308f2f9	42	char string_0001[65];
2ea622b8 ES	43
	44	#define SYSCTL_TEST_BITMAP_SIZE 65536
	45	unsigned long *bitmap_0001;
9308f2f9 LR	46	};
	47
	48	static struct test_sysctl_data test_data = {
	49	.int_0001 = 60,
eb965eda LR	50	.int_0002 = 1,
eb965eda LR	51
7c43a657 LR	52	.int_0003[0] = 0,
	53	.int_0003[1] = 1,
	54	.int_0003[2] = 2,
	55	.int_0003[3] = 3,
	56
4f2f682d VB	57	.boot_int = 0,
4f2f682d VB	58
2920fad3 LR	59	.uint_0001 = 314,
2920fad3 LR	60
9308f2f9 LR	61	.string_0001 = "(none)",
	62	};
	63
	64	/* These are all under /proc/sys/debug/test_sysctl/ */
	65	static struct ctl_table test_table[] = {
	66	{
	67	.procname = "int_0001",
	68	.data = &test_data.int_0001,
	69	.maxlen = sizeof(int),
	70	.mode = 0644,
	71	.proc_handler = proc_dointvec_minmax,
	72	.extra1 = &i_zero,
	73	.extra2 = &i_one_hundred,
	74	},
eb965eda LR	75	{
	76	.procname = "int_0002",
	77	.data = &test_data.int_0002,
	78	.maxlen = sizeof(int),
	79	.mode = 0644,
	80	.proc_handler = proc_dointvec,
	81	},
7c43a657 LR	82	{
	83	.procname = "int_0003",
	84	.data = &test_data.int_0003,
	85	.maxlen = sizeof(test_data.int_0003),
	86	.mode = 0644,
	87	.proc_handler = proc_dointvec,
	88	},
57b19468 TZ	89	{
	90	.procname = "match_int",
	91	.data = &match_int_ok,
	92	.maxlen = sizeof(match_int_ok),
	93	.mode = 0444,
	94	.proc_handler = proc_dointvec,
	95	},
4f2f682d VB	96	{
	97	.procname = "boot_int",
	98	.data = &test_data.boot_int,
	99	.maxlen = sizeof(test_data.boot_int),
	100	.mode = 0644,
	101	.proc_handler = proc_dointvec,
	102	.extra1 = SYSCTL_ZERO,
	103	.extra2 = SYSCTL_ONE,
	104	},
2920fad3 LR	105	{
	106	.procname = "uint_0001",
	107	.data = &test_data.uint_0001,
	108	.maxlen = sizeof(unsigned int),
	109	.mode = 0644,
	110	.proc_handler = proc_douintvec,
	111	},
9308f2f9 LR	112	{
	113	.procname = "string_0001",
	114	.data = &test_data.string_0001,
	115	.maxlen = sizeof(test_data.string_0001),
	116	.mode = 0644,
	117	.proc_handler = proc_dostring,
	118	},
2ea622b8 ES	119	{
	120	.procname = "bitmap_0001",
	121	.data = &test_data.bitmap_0001,
	122	.maxlen = SYSCTL_TEST_BITMAP_SIZE,
	123	.mode = 0644,
	124	.proc_handler = proc_do_large_bitmap,
	125	},
9308f2f9 LR	126	{ }
	127	};
	128
9308f2f9 LR	129	static struct ctl_table_header *test_sysctl_header;
	130
	131	static int __init test_sysctl_init(void)
	132	{
57b19468 TZ	133	int i;
	134
	135	struct {
	136	int defined;
	137	int wanted;
	138	} match_int[] = {
	139	{.defined = (int )SYSCTL_ZERO, .wanted = 0},
	140	{.defined = (int )SYSCTL_ONE, .wanted = 1},
	141	{.defined = (int )SYSCTL_TWO, .wanted = 2},
	142	{.defined = (int )SYSCTL_THREE, .wanted = 3},
	143	{.defined = (int )SYSCTL_FOUR, .wanted = 4},
	144	{.defined = (int )SYSCTL_ONE_HUNDRED, .wanted = 100},
	145	{.defined = (int )SYSCTL_TWO_HUNDRED, .wanted = 200},
	146	{.defined = (int )SYSCTL_ONE_THOUSAND, .wanted = 1000},
	147	{.defined = (int )SYSCTL_THREE_THOUSAND, .wanted = 3000},
	148	{.defined = (int )SYSCTL_INT_MAX, .wanted = INT_MAX},
	149	{.defined = (int )SYSCTL_MAXOLDUID, .wanted = 65535},
	150	{.defined = (int )SYSCTL_NEG_ONE, .wanted = -1},
	151	};
	152
	153	for (i = 0; i < ARRAY_SIZE(match_int); i++)
	154	if (match_int[i].defined != match_int[i].wanted)
	155	match_int_ok = 0;
	156
2ea622b8 ES	157	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	158	if (!test_data.bitmap_0001)
	159	return -ENOMEM;
04bc883c	160	test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
2ea622b8 ES	161	if (!test_sysctl_header) {
2ea622b8 ES	162	kfree(test_data.bitmap_0001);
9308f2f9	163	return -ENOMEM;
2ea622b8	164	}
9308f2f9 LR	165	return 0;
9308f2f9 LR	166	}
2f56f845	167	module_init(test_sysctl_init);
9308f2f9 LR	168
	169	static void __exit test_sysctl_exit(void)
	170	{
2ea622b8	171	kfree(test_data.bitmap_0001);
9308f2f9 LR	172	if (test_sysctl_header)
	173	unregister_sysctl_table(test_sysctl_header);
	174	}
	175
	176	module_exit(test_sysctl_exit);
	177
	178	MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
	179	MODULE_LICENSE("GPL");