crypto/fips.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * FIPS 200 support.
   4  *
   5  * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
   6  */
   7
   8 #include <linux/export.h>
   9 #include <linux/fips.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sysctl.h>
  14
  15 int fips_enabled;
  16 EXPORT_SYMBOL_GPL(fips_enabled);
  17
  18 /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
  19 static int fips_enable(char *str)
  20 {
  21         fips_enabled = !!simple_strtol(str, NULL, 0);
  22         printk(KERN_INFO "fips mode: %s\n",
  23                 fips_enabled ? "enabled" : "disabled");
  24         return 1;
  25 }
  26
  27 __setup("fips=", fips_enable);
  28
  29 static struct ctl_table crypto_sysctl_table[] = {
  30         {
  31                 .procname       = "fips_enabled",
  32                 .data           = &fips_enabled,
  33                 .maxlen         = sizeof(int),
  34                 .mode           = 0444,
  35                 .proc_handler   = proc_dointvec
  36         },
  37         {}
  38 };
  39
  40 static struct ctl_table crypto_dir_table[] = {
  41         {
  42                 .procname       = "crypto",
  43                 .mode           = 0555,
  44                 .child          = crypto_sysctl_table
  45         },
  46         {}
  47 };
  48
  49 static struct ctl_table_header *crypto_sysctls;
  50
  51 static void crypto_proc_fips_init(void)
  52 {
  53         crypto_sysctls = register_sysctl_table(crypto_dir_table);
  54 }
  55
  56 static void crypto_proc_fips_exit(void)
  57 {
  58         unregister_sysctl_table(crypto_sysctls);
  59 }
  60
  61 static int __init fips_init(void)
  62 {
  63         crypto_proc_fips_init();
  64         return 0;
  65 }
  66
  67 static void __exit fips_exit(void)
  68 {
  69         crypto_proc_fips_exit();
  70 }
  71
  72 subsys_initcall(fips_init);
  73 module_exit(fips_exit);