19308f2f9SLuis R. Rodriguez /* 29308f2f9SLuis R. Rodriguez * proc sysctl test driver 39308f2f9SLuis R. Rodriguez * 49308f2f9SLuis R. Rodriguez * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> 59308f2f9SLuis R. Rodriguez * 69308f2f9SLuis R. Rodriguez * This program is free software; you can redistribute it and/or modify it 79308f2f9SLuis R. Rodriguez * under the terms of the GNU General Public License as published by the Free 89308f2f9SLuis R. Rodriguez * Software Foundation; either version 2 of the License, or at your option any 99308f2f9SLuis R. Rodriguez * later version; or, when distributed separately from the Linux kernel or 109308f2f9SLuis R. Rodriguez * when incorporated into other software packages, subject to the following 119308f2f9SLuis R. Rodriguez * license: 129308f2f9SLuis R. Rodriguez * 139308f2f9SLuis R. Rodriguez * This program is free software; you can redistribute it and/or modify it 149308f2f9SLuis R. Rodriguez * under the terms of copyleft-next (version 0.3.1 or later) as published 159308f2f9SLuis R. Rodriguez * at http://copyleft-next.org/. 169308f2f9SLuis R. Rodriguez */ 179308f2f9SLuis R. Rodriguez 189308f2f9SLuis R. Rodriguez /* 192d046981SRandy Dunlap * This module provides an interface to the proc sysctl interfaces. This 209308f2f9SLuis R. Rodriguez * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the 219308f2f9SLuis R. Rodriguez * system unless explicitly requested by name. You can also build this driver 229308f2f9SLuis R. Rodriguez * into your kernel. 239308f2f9SLuis R. Rodriguez */ 249308f2f9SLuis R. Rodriguez 259308f2f9SLuis R. Rodriguez #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 269308f2f9SLuis R. Rodriguez 279308f2f9SLuis R. Rodriguez #include <linux/init.h> 289308f2f9SLuis R. Rodriguez #include <linux/list.h> 299308f2f9SLuis R. Rodriguez #include <linux/module.h> 309308f2f9SLuis R. Rodriguez #include <linux/printk.h> 319308f2f9SLuis R. Rodriguez #include <linux/fs.h> 329308f2f9SLuis R. Rodriguez #include <linux/miscdevice.h> 339308f2f9SLuis R. Rodriguez #include <linux/slab.h> 349308f2f9SLuis R. Rodriguez #include <linux/uaccess.h> 359308f2f9SLuis R. Rodriguez #include <linux/async.h> 369308f2f9SLuis R. Rodriguez #include <linux/delay.h> 379308f2f9SLuis R. Rodriguez #include <linux/vmalloc.h> 389308f2f9SLuis R. Rodriguez 399308f2f9SLuis R. Rodriguez static int i_zero; 409308f2f9SLuis R. Rodriguez static int i_one_hundred = 100; 41*57b19468STonghao Zhang static int match_int_ok = 1; 429308f2f9SLuis R. Rodriguez 439308f2f9SLuis R. Rodriguez struct test_sysctl_data { 449308f2f9SLuis R. Rodriguez int int_0001; 45eb965edaSLuis R. Rodriguez int int_0002; 467c43a657SLuis R. Rodriguez int int_0003[4]; 47eb965edaSLuis R. Rodriguez 484f2f682dSVlastimil Babka int boot_int; 494f2f682dSVlastimil Babka 502920fad3SLuis R. Rodriguez unsigned int uint_0001; 512920fad3SLuis R. Rodriguez 529308f2f9SLuis R. Rodriguez char string_0001[65]; 532ea622b8SEric Sandeen 542ea622b8SEric Sandeen #define SYSCTL_TEST_BITMAP_SIZE 65536 552ea622b8SEric Sandeen unsigned long *bitmap_0001; 569308f2f9SLuis R. Rodriguez }; 579308f2f9SLuis R. Rodriguez 589308f2f9SLuis R. Rodriguez static struct test_sysctl_data test_data = { 599308f2f9SLuis R. Rodriguez .int_0001 = 60, 60eb965edaSLuis R. Rodriguez .int_0002 = 1, 61eb965edaSLuis R. Rodriguez 627c43a657SLuis R. Rodriguez .int_0003[0] = 0, 637c43a657SLuis R. Rodriguez .int_0003[1] = 1, 647c43a657SLuis R. Rodriguez .int_0003[2] = 2, 657c43a657SLuis R. Rodriguez .int_0003[3] = 3, 667c43a657SLuis R. Rodriguez 674f2f682dSVlastimil Babka .boot_int = 0, 684f2f682dSVlastimil Babka 692920fad3SLuis R. Rodriguez .uint_0001 = 314, 702920fad3SLuis R. Rodriguez 719308f2f9SLuis R. Rodriguez .string_0001 = "(none)", 729308f2f9SLuis R. Rodriguez }; 739308f2f9SLuis R. Rodriguez 749308f2f9SLuis R. Rodriguez /* These are all under /proc/sys/debug/test_sysctl/ */ 759308f2f9SLuis R. Rodriguez static struct ctl_table test_table[] = { 769308f2f9SLuis R. Rodriguez { 779308f2f9SLuis R. Rodriguez .procname = "int_0001", 789308f2f9SLuis R. Rodriguez .data = &test_data.int_0001, 799308f2f9SLuis R. Rodriguez .maxlen = sizeof(int), 809308f2f9SLuis R. Rodriguez .mode = 0644, 819308f2f9SLuis R. Rodriguez .proc_handler = proc_dointvec_minmax, 829308f2f9SLuis R. Rodriguez .extra1 = &i_zero, 839308f2f9SLuis R. Rodriguez .extra2 = &i_one_hundred, 849308f2f9SLuis R. Rodriguez }, 859308f2f9SLuis R. Rodriguez { 86eb965edaSLuis R. Rodriguez .procname = "int_0002", 87eb965edaSLuis R. Rodriguez .data = &test_data.int_0002, 88eb965edaSLuis R. Rodriguez .maxlen = sizeof(int), 89eb965edaSLuis R. Rodriguez .mode = 0644, 90eb965edaSLuis R. Rodriguez .proc_handler = proc_dointvec, 91eb965edaSLuis R. Rodriguez }, 92eb965edaSLuis R. Rodriguez { 937c43a657SLuis R. Rodriguez .procname = "int_0003", 947c43a657SLuis R. Rodriguez .data = &test_data.int_0003, 957c43a657SLuis R. Rodriguez .maxlen = sizeof(test_data.int_0003), 967c43a657SLuis R. Rodriguez .mode = 0644, 977c43a657SLuis R. Rodriguez .proc_handler = proc_dointvec, 987c43a657SLuis R. Rodriguez }, 997c43a657SLuis R. Rodriguez { 100*57b19468STonghao Zhang .procname = "match_int", 101*57b19468STonghao Zhang .data = &match_int_ok, 102*57b19468STonghao Zhang .maxlen = sizeof(match_int_ok), 103*57b19468STonghao Zhang .mode = 0444, 104*57b19468STonghao Zhang .proc_handler = proc_dointvec, 105*57b19468STonghao Zhang }, 106*57b19468STonghao Zhang { 1074f2f682dSVlastimil Babka .procname = "boot_int", 1084f2f682dSVlastimil Babka .data = &test_data.boot_int, 1094f2f682dSVlastimil Babka .maxlen = sizeof(test_data.boot_int), 1104f2f682dSVlastimil Babka .mode = 0644, 1114f2f682dSVlastimil Babka .proc_handler = proc_dointvec, 1124f2f682dSVlastimil Babka .extra1 = SYSCTL_ZERO, 1134f2f682dSVlastimil Babka .extra2 = SYSCTL_ONE, 1144f2f682dSVlastimil Babka }, 1154f2f682dSVlastimil Babka { 1162920fad3SLuis R. Rodriguez .procname = "uint_0001", 1172920fad3SLuis R. Rodriguez .data = &test_data.uint_0001, 1182920fad3SLuis R. Rodriguez .maxlen = sizeof(unsigned int), 1192920fad3SLuis R. Rodriguez .mode = 0644, 1202920fad3SLuis R. Rodriguez .proc_handler = proc_douintvec, 1212920fad3SLuis R. Rodriguez }, 1222920fad3SLuis R. Rodriguez { 1239308f2f9SLuis R. Rodriguez .procname = "string_0001", 1249308f2f9SLuis R. Rodriguez .data = &test_data.string_0001, 1259308f2f9SLuis R. Rodriguez .maxlen = sizeof(test_data.string_0001), 1269308f2f9SLuis R. Rodriguez .mode = 0644, 1279308f2f9SLuis R. Rodriguez .proc_handler = proc_dostring, 1289308f2f9SLuis R. Rodriguez }, 1292ea622b8SEric Sandeen { 1302ea622b8SEric Sandeen .procname = "bitmap_0001", 1312ea622b8SEric Sandeen .data = &test_data.bitmap_0001, 1322ea622b8SEric Sandeen .maxlen = SYSCTL_TEST_BITMAP_SIZE, 1332ea622b8SEric Sandeen .mode = 0644, 1342ea622b8SEric Sandeen .proc_handler = proc_do_large_bitmap, 1352ea622b8SEric Sandeen }, 1369308f2f9SLuis R. Rodriguez { } 1379308f2f9SLuis R. Rodriguez }; 1389308f2f9SLuis R. Rodriguez 1399308f2f9SLuis R. Rodriguez static struct ctl_table_header *test_sysctl_header; 1409308f2f9SLuis R. Rodriguez 1419308f2f9SLuis R. Rodriguez static int __init test_sysctl_init(void) 1429308f2f9SLuis R. Rodriguez { 143*57b19468STonghao Zhang int i; 144*57b19468STonghao Zhang 145*57b19468STonghao Zhang struct { 146*57b19468STonghao Zhang int defined; 147*57b19468STonghao Zhang int wanted; 148*57b19468STonghao Zhang } match_int[] = { 149*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_ZERO, .wanted = 0}, 150*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_ONE, .wanted = 1}, 151*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_TWO, .wanted = 2}, 152*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_THREE, .wanted = 3}, 153*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_FOUR, .wanted = 4}, 154*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100}, 155*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_TWO_HUNDRED, .wanted = 200}, 156*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000}, 157*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000}, 158*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_INT_MAX, .wanted = INT_MAX}, 159*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_MAXOLDUID, .wanted = 65535}, 160*57b19468STonghao Zhang {.defined = *(int *)SYSCTL_NEG_ONE, .wanted = -1}, 161*57b19468STonghao Zhang }; 162*57b19468STonghao Zhang 163*57b19468STonghao Zhang for (i = 0; i < ARRAY_SIZE(match_int); i++) 164*57b19468STonghao Zhang if (match_int[i].defined != match_int[i].wanted) 165*57b19468STonghao Zhang match_int_ok = 0; 166*57b19468STonghao Zhang 1672ea622b8SEric Sandeen test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL); 1682ea622b8SEric Sandeen if (!test_data.bitmap_0001) 1699308f2f9SLuis R. Rodriguez return -ENOMEM; 17004bc883cSLuis Chamberlain test_sysctl_header = register_sysctl("debug/test_sysctl", test_table); 1712ea622b8SEric Sandeen if (!test_sysctl_header) { 1722ea622b8SEric Sandeen kfree(test_data.bitmap_0001); 1732ea622b8SEric Sandeen return -ENOMEM; 1742ea622b8SEric Sandeen } 1759308f2f9SLuis R. Rodriguez return 0; 1769308f2f9SLuis R. Rodriguez } 1772f56f845SMasami Hiramatsu module_init(test_sysctl_init); 1789308f2f9SLuis R. Rodriguez 1799308f2f9SLuis R. Rodriguez static void __exit test_sysctl_exit(void) 1809308f2f9SLuis R. Rodriguez { 1812ea622b8SEric Sandeen kfree(test_data.bitmap_0001); 1829308f2f9SLuis R. Rodriguez if (test_sysctl_header) 1839308f2f9SLuis R. Rodriguez unregister_sysctl_table(test_sysctl_header); 1849308f2f9SLuis R. Rodriguez } 1859308f2f9SLuis R. Rodriguez 1869308f2f9SLuis R. Rodriguez module_exit(test_sysctl_exit); 1879308f2f9SLuis R. Rodriguez 1889308f2f9SLuis R. Rodriguez MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); 1899308f2f9SLuis R. Rodriguez MODULE_LICENSE("GPL"); 190