1/*
2 * Scatterlist Cryptographic API.
3 *
4 * Procfs information.
5 *
6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
7 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
16#include <linux/atomic.h>
17#include <linux/init.h>
18#include <linux/crypto.h>
19#include <linux/module.h>	/* for module_name() */
20#include <linux/rwsem.h>
21#include <linux/proc_fs.h>
22#include <linux/seq_file.h>
23#include <linux/sysctl.h>
24#include "internal.h"
25
26#ifdef CONFIG_CRYPTO_FIPS
27static struct ctl_table crypto_sysctl_table[] = {
28	{
29		.procname       = "fips_enabled",
30		.data           = &fips_enabled,
31		.maxlen         = sizeof(int),
32		.mode           = 0444,
33		.proc_handler   = proc_dointvec
34	},
35	{}
36};
37
38static struct ctl_table crypto_dir_table[] = {
39	{
40		.procname       = "crypto",
41		.mode           = 0555,
42		.child          = crypto_sysctl_table
43	},
44	{}
45};
46
47static struct ctl_table_header *crypto_sysctls;
48
49static void crypto_proc_fips_init(void)
50{
51	crypto_sysctls = register_sysctl_table(crypto_dir_table);
52}
53
54static void crypto_proc_fips_exit(void)
55{
56	if (crypto_sysctls)
57		unregister_sysctl_table(crypto_sysctls);
58}
59#else
60#define crypto_proc_fips_init()
61#define crypto_proc_fips_exit()
62#endif
63
64static void *c_start(struct seq_file *m, loff_t *pos)
65{
66	down_read(&crypto_alg_sem);
67	return seq_list_start(&crypto_alg_list, *pos);
68}
69
70static void *c_next(struct seq_file *m, void *p, loff_t *pos)
71{
72	return seq_list_next(p, &crypto_alg_list, pos);
73}
74
75static void c_stop(struct seq_file *m, void *p)
76{
77	up_read(&crypto_alg_sem);
78}
79
80static int c_show(struct seq_file *m, void *p)
81{
82	struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
83
84	seq_printf(m, "name         : %s\n", alg->cra_name);
85	seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
86	seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
87	seq_printf(m, "priority     : %d\n", alg->cra_priority);
88	seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
89	seq_printf(m, "selftest     : %s\n",
90		   (alg->cra_flags & CRYPTO_ALG_TESTED) ?
91		   "passed" : "unknown");
92	seq_printf(m, "internal     : %s\n",
93		   (alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
94		   "yes" : "no");
95
96	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
97		seq_printf(m, "type         : larval\n");
98		seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
99		goto out;
100	}
101
102	if (alg->cra_type && alg->cra_type->show) {
103		alg->cra_type->show(m, alg);
104		goto out;
105	}
106
107	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
108	case CRYPTO_ALG_TYPE_CIPHER:
109		seq_printf(m, "type         : cipher\n");
110		seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
111		seq_printf(m, "min keysize  : %u\n",
112					alg->cra_cipher.cia_min_keysize);
113		seq_printf(m, "max keysize  : %u\n",
114					alg->cra_cipher.cia_max_keysize);
115		break;
116	case CRYPTO_ALG_TYPE_COMPRESS:
117		seq_printf(m, "type         : compression\n");
118		break;
119	default:
120		seq_printf(m, "type         : unknown\n");
121		break;
122	}
123
124out:
125	seq_putc(m, '\n');
126	return 0;
127}
128
129static const struct seq_operations crypto_seq_ops = {
130	.start		= c_start,
131	.next		= c_next,
132	.stop		= c_stop,
133	.show		= c_show
134};
135
136static int crypto_info_open(struct inode *inode, struct file *file)
137{
138	return seq_open(file, &crypto_seq_ops);
139}
140
141static const struct file_operations proc_crypto_ops = {
142	.open		= crypto_info_open,
143	.read		= seq_read,
144	.llseek		= seq_lseek,
145	.release	= seq_release
146};
147
148void __init crypto_init_proc(void)
149{
150	proc_create("crypto", 0, NULL, &proc_crypto_ops);
151	crypto_proc_fips_init();
152}
153
154void __exit crypto_exit_proc(void)
155{
156	crypto_proc_fips_exit();
157	remove_proc_entry("crypto", NULL);
158}
159