[people/ms/linux.git] / lib / test_sysctl.c

/*
 * proc sysctl test driver
 *
 * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
 *
 * 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 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
9308f2f9 LR	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	/*
2d046981	19	* This module provides an interface to the proc sysctl interfaces. This
9308f2f9 LR	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;
57b19468	41	static int match_int_ok = 1;
9308f2f9 LR	42
	43	struct test_sysctl_data {
	44	int int_0001;
eb965eda	45	int int_0002;
7c43a657	46	int int_0003[4];
eb965eda	47
4f2f682d VB	48	int boot_int;
4f2f682d VB	49
2920fad3 LR	50	unsigned int uint_0001;
2920fad3 LR	51
9308f2f9	52	char string_0001[65];
2ea622b8 ES	53
	54	#define SYSCTL_TEST_BITMAP_SIZE 65536
	55	unsigned long *bitmap_0001;
9308f2f9 LR	56	};
	57
	58	static struct test_sysctl_data test_data = {
	59	.int_0001 = 60,
eb965eda LR	60	.int_0002 = 1,
eb965eda LR	61
7c43a657 LR	62	.int_0003[0] = 0,
	63	.int_0003[1] = 1,
	64	.int_0003[2] = 2,
	65	.int_0003[3] = 3,
	66
4f2f682d VB	67	.boot_int = 0,
4f2f682d VB	68
2920fad3 LR	69	.uint_0001 = 314,
2920fad3 LR	70
9308f2f9 LR	71	.string_0001 = "(none)",
	72	};
	73
	74	/* These are all under /proc/sys/debug/test_sysctl/ */
	75	static struct ctl_table test_table[] = {
	76	{
	77	.procname = "int_0001",
	78	.data = &test_data.int_0001,
	79	.maxlen = sizeof(int),
	80	.mode = 0644,
	81	.proc_handler = proc_dointvec_minmax,
	82	.extra1 = &i_zero,
	83	.extra2 = &i_one_hundred,
	84	},
eb965eda LR	85	{
	86	.procname = "int_0002",
	87	.data = &test_data.int_0002,
	88	.maxlen = sizeof(int),
	89	.mode = 0644,
	90	.proc_handler = proc_dointvec,
	91	},
7c43a657 LR	92	{
	93	.procname = "int_0003",
	94	.data = &test_data.int_0003,
	95	.maxlen = sizeof(test_data.int_0003),
	96	.mode = 0644,
	97	.proc_handler = proc_dointvec,
	98	},
57b19468 TZ	99	{
	100	.procname = "match_int",
	101	.data = &match_int_ok,
	102	.maxlen = sizeof(match_int_ok),
	103	.mode = 0444,
	104	.proc_handler = proc_dointvec,
	105	},
4f2f682d VB	106	{
	107	.procname = "boot_int",
	108	.data = &test_data.boot_int,
	109	.maxlen = sizeof(test_data.boot_int),
	110	.mode = 0644,
	111	.proc_handler = proc_dointvec,
	112	.extra1 = SYSCTL_ZERO,
	113	.extra2 = SYSCTL_ONE,
	114	},
2920fad3 LR	115	{
	116	.procname = "uint_0001",
	117	.data = &test_data.uint_0001,
	118	.maxlen = sizeof(unsigned int),
	119	.mode = 0644,
	120	.proc_handler = proc_douintvec,
	121	},
9308f2f9 LR	122	{
	123	.procname = "string_0001",
	124	.data = &test_data.string_0001,
	125	.maxlen = sizeof(test_data.string_0001),
	126	.mode = 0644,
	127	.proc_handler = proc_dostring,
	128	},
2ea622b8 ES	129	{
	130	.procname = "bitmap_0001",
	131	.data = &test_data.bitmap_0001,
	132	.maxlen = SYSCTL_TEST_BITMAP_SIZE,
	133	.mode = 0644,
	134	.proc_handler = proc_do_large_bitmap,
	135	},
9308f2f9 LR	136	{ }
	137	};
	138
9308f2f9 LR	139	static struct ctl_table_header *test_sysctl_header;
	140
	141	static int __init test_sysctl_init(void)
	142	{
57b19468 TZ	143	int i;
	144
	145	struct {
	146	int defined;
	147	int wanted;
	148	} match_int[] = {
	149	{.defined = (int )SYSCTL_ZERO, .wanted = 0},
	150	{.defined = (int )SYSCTL_ONE, .wanted = 1},
	151	{.defined = (int )SYSCTL_TWO, .wanted = 2},
	152	{.defined = (int )SYSCTL_THREE, .wanted = 3},
	153	{.defined = (int )SYSCTL_FOUR, .wanted = 4},
	154	{.defined = (int )SYSCTL_ONE_HUNDRED, .wanted = 100},
	155	{.defined = (int )SYSCTL_TWO_HUNDRED, .wanted = 200},
	156	{.defined = (int )SYSCTL_ONE_THOUSAND, .wanted = 1000},
	157	{.defined = (int )SYSCTL_THREE_THOUSAND, .wanted = 3000},
	158	{.defined = (int )SYSCTL_INT_MAX, .wanted = INT_MAX},
	159	{.defined = (int )SYSCTL_MAXOLDUID, .wanted = 65535},
	160	{.defined = (int )SYSCTL_NEG_ONE, .wanted = -1},
	161	};
	162
	163	for (i = 0; i < ARRAY_SIZE(match_int); i++)
	164	if (match_int[i].defined != match_int[i].wanted)
	165	match_int_ok = 0;
	166
2ea622b8 ES	167	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	168	if (!test_data.bitmap_0001)
	169	return -ENOMEM;
04bc883c	170	test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
2ea622b8 ES	171	if (!test_sysctl_header) {
2ea622b8 ES	172	kfree(test_data.bitmap_0001);
9308f2f9	173	return -ENOMEM;
2ea622b8	174	}
9308f2f9 LR	175	return 0;
9308f2f9 LR	176	}
2f56f845	177	module_init(test_sysctl_init);
9308f2f9 LR	178
	179	static void __exit test_sysctl_exit(void)
	180	{
2ea622b8	181	kfree(test_data.bitmap_0001);
9308f2f9 LR	182	if (test_sysctl_header)
	183	unregister_sysctl_table(test_sysctl_header);
	184	}
	185
	186	module_exit(test_sysctl_exit);
	187
	188	MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
	189	MODULE_LICENSE("GPL");