[linux.git] / lib / test_sysctl.c

/*
 * proc sysctl test driver
 *
 * Copyright (C) 2017 Luis R. Rodriguez <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or at your option any
 * later version; or, when distributed separately from the Linux kernel or
 * when incorporated into other software packages, subject to the following
 * license:
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of copyleft-next (version 0.3.1 or later) as published
 * at http://copyleft-next.org/.
 */

/*
 * This module provides an interface to the 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;

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

	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,

	.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	= "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 test_sysctl_table[] = {
	{
		.procname	= "test_sysctl",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= test_table,
	},
	{ }
};

static struct ctl_table test_sysctl_root_table[] = {
	{
		.procname	= "debug",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= test_sysctl_table,
	},
	{ }
};

static struct ctl_table_header *test_sysctl_header;

static int __init test_sysctl_init(void)
{
	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	if (!test_data.bitmap_0001)
		return -ENOMEM;
	test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
	if (!test_sysctl_header) {
		kfree(test_data.bitmap_0001);
		return -ENOMEM;
	}
	return 0;
}
late_initcall(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 <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
9308f2f9 LR	1	/*
	2	* proc sysctl test driver
	3	*
	4	* Copyright (C) 2017 Luis R. Rodriguez <[email protected]>
	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 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
	39	static int i_zero;
	40	static int i_one_hundred = 100;
	41
	42	struct test_sysctl_data {
	43	int int_0001;
eb965eda	44	int int_0002;
7c43a657	45	int int_0003[4];
eb965eda	46
2920fad3 LR	47	unsigned int uint_0001;
2920fad3 LR	48
9308f2f9	49	char string_0001[65];
2ea622b8 ES	50
	51	#define SYSCTL_TEST_BITMAP_SIZE 65536
	52	unsigned long *bitmap_0001;
9308f2f9 LR	53	};
	54
	55	static struct test_sysctl_data test_data = {
	56	.int_0001 = 60,
eb965eda LR	57	.int_0002 = 1,
eb965eda LR	58
7c43a657 LR	59	.int_0003[0] = 0,
	60	.int_0003[1] = 1,
	61	.int_0003[2] = 2,
	62	.int_0003[3] = 3,
	63
2920fad3 LR	64	.uint_0001 = 314,
2920fad3 LR	65
9308f2f9 LR	66	.string_0001 = "(none)",
	67	};
	68
	69	/* These are all under /proc/sys/debug/test_sysctl/ */
	70	static struct ctl_table test_table[] = {
	71	{
	72	.procname = "int_0001",
	73	.data = &test_data.int_0001,
	74	.maxlen = sizeof(int),
	75	.mode = 0644,
	76	.proc_handler = proc_dointvec_minmax,
	77	.extra1 = &i_zero,
	78	.extra2 = &i_one_hundred,
	79	},
eb965eda LR	80	{
	81	.procname = "int_0002",
	82	.data = &test_data.int_0002,
	83	.maxlen = sizeof(int),
	84	.mode = 0644,
	85	.proc_handler = proc_dointvec,
	86	},
7c43a657 LR	87	{
	88	.procname = "int_0003",
	89	.data = &test_data.int_0003,
	90	.maxlen = sizeof(test_data.int_0003),
	91	.mode = 0644,
	92	.proc_handler = proc_dointvec,
	93	},
2920fad3 LR	94	{
	95	.procname = "uint_0001",
	96	.data = &test_data.uint_0001,
	97	.maxlen = sizeof(unsigned int),
	98	.mode = 0644,
	99	.proc_handler = proc_douintvec,
	100	},
9308f2f9 LR	101	{
	102	.procname = "string_0001",
	103	.data = &test_data.string_0001,
	104	.maxlen = sizeof(test_data.string_0001),
	105	.mode = 0644,
	106	.proc_handler = proc_dostring,
	107	},
2ea622b8 ES	108	{
	109	.procname = "bitmap_0001",
	110	.data = &test_data.bitmap_0001,
	111	.maxlen = SYSCTL_TEST_BITMAP_SIZE,
	112	.mode = 0644,
	113	.proc_handler = proc_do_large_bitmap,
	114	},
9308f2f9 LR	115	{ }
	116	};
	117
	118	static struct ctl_table test_sysctl_table[] = {
	119	{
	120	.procname = "test_sysctl",
	121	.maxlen = 0,
	122	.mode = 0555,
	123	.child = test_table,
	124	},
	125	{ }
	126	};
	127
	128	static struct ctl_table test_sysctl_root_table[] = {
	129	{
	130	.procname = "debug",
	131	.maxlen = 0,
	132	.mode = 0555,
	133	.child = test_sysctl_table,
	134	},
	135	{ }
	136	};
	137
	138	static struct ctl_table_header *test_sysctl_header;
	139
	140	static int __init test_sysctl_init(void)
	141	{
2ea622b8 ES	142	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	143	if (!test_data.bitmap_0001)
	144	return -ENOMEM;
9308f2f9	145	test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
2ea622b8 ES	146	if (!test_sysctl_header) {
2ea622b8 ES	147	kfree(test_data.bitmap_0001);
9308f2f9	148	return -ENOMEM;
2ea622b8	149	}
9308f2f9 LR	150	return 0;
	151	}
	152	late_initcall(test_sysctl_init);
	153
	154	static void __exit test_sysctl_exit(void)
	155	{
2ea622b8	156	kfree(test_data.bitmap_0001);
9308f2f9 LR	157	if (test_sysctl_header)
	158	unregister_sysctl_table(test_sysctl_header);
	159	}
	160
	161	module_exit(test_sysctl_exit);
	162
	163	MODULE_AUTHOR("Luis R. Rodriguez <[email protected]>");
	164	MODULE_LICENSE("GPL");