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#include <linux/notifier.h>
15#include <generated/utsrelease.h>
16
17int fips_enabled;
18EXPORT_SYMBOL_GPL(fips_enabled);
19
20ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
21EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
22
23/* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
24static 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#define FIPS_MODULE_NAME CONFIG_CRYPTO_FIPS_NAME
35#ifdef CONFIG_CRYPTO_FIPS_CUSTOM_VERSION
36#define FIPS_MODULE_VERSION CONFIG_CRYPTO_FIPS_VERSION
37#else
38#define FIPS_MODULE_VERSION UTS_RELEASE
39#endif
40
41static char fips_name[] = FIPS_MODULE_NAME;
42static char fips_version[] = FIPS_MODULE_VERSION;
43
44static struct ctl_table crypto_sysctl_table[] = {
45	{
46		.procname	= "fips_enabled",
47		.data		= &fips_enabled,
48		.maxlen		= sizeof(int),
49		.mode		= 0444,
50		.proc_handler	= proc_dointvec
51	},
52	{
53		.procname	= "fips_name",
54		.data		= &fips_name,
55		.maxlen		= 64,
56		.mode		= 0444,
57		.proc_handler	= proc_dostring
58	},
59	{
60		.procname	= "fips_version",
61		.data		= &fips_version,
62		.maxlen		= 64,
63		.mode		= 0444,
64		.proc_handler	= proc_dostring
65	},
66	{}
67};
68
69static struct ctl_table_header *crypto_sysctls;
70
71static void crypto_proc_fips_init(void)
72{
73	crypto_sysctls = register_sysctl("crypto", crypto_sysctl_table);
74}
75
76static void crypto_proc_fips_exit(void)
77{
78	unregister_sysctl_table(crypto_sysctls);
79}
80
81void fips_fail_notify(void)
82{
83	if (fips_enabled)
84		atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
85}
86EXPORT_SYMBOL_GPL(fips_fail_notify);
87
88static int __init fips_init(void)
89{
90	crypto_proc_fips_init();
91	return 0;
92}
93
94static void __exit fips_exit(void)
95{
96	crypto_proc_fips_exit();
97}
98
99subsys_initcall(fips_init);
100module_exit(fips_exit);
101