crypto/fips.c

   1 /*
   2  * FIPS 200 support.
   3  *
   4  * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
   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)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/export.h>
  14 #include <linux/fips.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/sysctl.h>
  19
  20 int fips_enabled;
  21 EXPORT_SYMBOL_GPL(fips_enabled);
  22
  23 /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
  24 static int fips_enable(char *str)
  25 {
  26         fips_enabled = !!simple_strtol(str, NULL, 0);
  27         printk(KERN_INFO "fips mode: %s\n",
  28                 fips_enabled ? "enabled" : "disabled");
  29         return 1;
  30 }
  31
  32 __setup("fips=", fips_enable);
  33
  34 static struct ctl_table crypto_sysctl_table[] = {
  35         {
  36                 .procname       = "fips_enabled",
  37                 .data           = &fips_enabled,
  38                 .maxlen         = sizeof(int),
  39                 .mode           = 0444,
  40                 .proc_handler   = proc_dointvec
  41         },
  42         {}
  43 };
  44
  45 static struct ctl_table crypto_dir_table[] = {
  46         {
  47                 .procname       = "crypto",
  48                 .mode           = 0555,
  49                 .child          = crypto_sysctl_table
  50         },
  51         {}
  52 };
  53
  54 static struct ctl_table_header *crypto_sysctls;
  55
  56 static void crypto_proc_fips_init(void)
  57 {
  58         crypto_sysctls = register_sysctl_table(crypto_dir_table);
  59 }
  60
  61 static void crypto_proc_fips_exit(void)
  62 {
  63         unregister_sysctl_table(crypto_sysctls);
  64 }
  65
  66 static int __init fips_init(void)
  67 {
  68         crypto_proc_fips_init();
  69         return 0;
  70 }
  71
  72 static void __exit fips_exit(void)
  73 {
  74         crypto_proc_fips_exit();
  75 }
  76
  77 module_init(fips_init);
  78 module_exit(fips_exit);