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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 |
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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; |
49 | ||
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50 | unsigned int uint_0001; |
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, |
61 | ||
7c43a657 LR |
62 | .int_0003[0] = 0, |
63 | .int_0003[1] = 1, | |
64 | .int_0003[2] = 2, | |
65 | .int_0003[3] = 3, | |
66 | ||
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67 | .boot_int = 0, |
68 | ||
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69 | .uint_0001 = 314, |
70 | ||
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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 | }, | |
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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 | }, | |
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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 | }, | |
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136 | { } |
137 | }; | |
138 | ||
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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) { |
172 | kfree(test_data.bitmap_0001); | |
9308f2f9 | 173 | return -ENOMEM; |
2ea622b8 | 174 | } |
9308f2f9 LR |
175 | return 0; |
176 | } | |
2f56f845 | 177 | module_init(test_sysctl_init); |
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178 | |
179 | static void __exit test_sysctl_exit(void) | |
180 | { | |
2ea622b8 | 181 | kfree(test_data.bitmap_0001); |
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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"); |