1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * FIPS 200 support.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/export.h>
9*4882a593Smuzhiyun #include <linux/fips.h>
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <linux/sysctl.h>
14*4882a593Smuzhiyun #include <linux/notifier.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun int fips_enabled;
17*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(fips_enabled);
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
20*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
fips_enable(char * str)23*4882a593Smuzhiyun static int fips_enable(char *str)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun fips_enabled = !!simple_strtol(str, NULL, 0);
26*4882a593Smuzhiyun printk(KERN_INFO "fips mode: %s\n",
27*4882a593Smuzhiyun fips_enabled ? "enabled" : "disabled");
28*4882a593Smuzhiyun return 1;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun __setup("fips=", fips_enable);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun static struct ctl_table crypto_sysctl_table[] = {
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun .procname = "fips_enabled",
36*4882a593Smuzhiyun .data = &fips_enabled,
37*4882a593Smuzhiyun .maxlen = sizeof(int),
38*4882a593Smuzhiyun .mode = 0444,
39*4882a593Smuzhiyun .proc_handler = proc_dointvec
40*4882a593Smuzhiyun },
41*4882a593Smuzhiyun {}
42*4882a593Smuzhiyun };
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun static struct ctl_table crypto_dir_table[] = {
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun .procname = "crypto",
47*4882a593Smuzhiyun .mode = 0555,
48*4882a593Smuzhiyun .child = crypto_sysctl_table
49*4882a593Smuzhiyun },
50*4882a593Smuzhiyun {}
51*4882a593Smuzhiyun };
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun static struct ctl_table_header *crypto_sysctls;
54*4882a593Smuzhiyun
crypto_proc_fips_init(void)55*4882a593Smuzhiyun static void crypto_proc_fips_init(void)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun crypto_sysctls = register_sysctl_table(crypto_dir_table);
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
crypto_proc_fips_exit(void)60*4882a593Smuzhiyun static void crypto_proc_fips_exit(void)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun unregister_sysctl_table(crypto_sysctls);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
fips_fail_notify(void)65*4882a593Smuzhiyun void fips_fail_notify(void)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun if (fips_enabled)
68*4882a593Smuzhiyun atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(fips_fail_notify);
71*4882a593Smuzhiyun
fips_init(void)72*4882a593Smuzhiyun static int __init fips_init(void)
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun crypto_proc_fips_init();
75*4882a593Smuzhiyun return 0;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
fips_exit(void)78*4882a593Smuzhiyun static void __exit fips_exit(void)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun crypto_proc_fips_exit();
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun subsys_initcall(fips_init);
84*4882a593Smuzhiyun module_exit(fips_exit);
85