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
27 static 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
38 static struct ctl_table crypto_dir_table[] = {
39 {
40 .procname = "crypto",
41 .mode = 0555,
42 .child = crypto_sysctl_table
43 },
44 {}
45 };
46
47 static struct ctl_table_header *crypto_sysctls;
48
crypto_proc_fips_init(void)49 static void crypto_proc_fips_init(void)
50 {
51 crypto_sysctls = register_sysctl_table(crypto_dir_table);
52 }
53
crypto_proc_fips_exit(void)54 static 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
c_start(struct seq_file * m,loff_t * pos)64 static 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
c_next(struct seq_file * m,void * p,loff_t * pos)70 static 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
c_stop(struct seq_file * m,void * p)75 static void c_stop(struct seq_file *m, void *p)
76 {
77 up_read(&crypto_alg_sem);
78 }
79
c_show(struct seq_file * m,void * p)80 static 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
93 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
94 seq_printf(m, "type : larval\n");
95 seq_printf(m, "flags : 0x%x\n", alg->cra_flags);
96 goto out;
97 }
98
99 if (alg->cra_type && alg->cra_type->show) {
100 alg->cra_type->show(m, alg);
101 goto out;
102 }
103
104 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
105 case CRYPTO_ALG_TYPE_CIPHER:
106 seq_printf(m, "type : cipher\n");
107 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
108 seq_printf(m, "min keysize : %u\n",
109 alg->cra_cipher.cia_min_keysize);
110 seq_printf(m, "max keysize : %u\n",
111 alg->cra_cipher.cia_max_keysize);
112 break;
113 case CRYPTO_ALG_TYPE_COMPRESS:
114 seq_printf(m, "type : compression\n");
115 break;
116 default:
117 seq_printf(m, "type : unknown\n");
118 break;
119 }
120
121 out:
122 seq_putc(m, '\n');
123 return 0;
124 }
125
126 static const struct seq_operations crypto_seq_ops = {
127 .start = c_start,
128 .next = c_next,
129 .stop = c_stop,
130 .show = c_show
131 };
132
crypto_info_open(struct inode * inode,struct file * file)133 static int crypto_info_open(struct inode *inode, struct file *file)
134 {
135 return seq_open(file, &crypto_seq_ops);
136 }
137
138 static const struct file_operations proc_crypto_ops = {
139 .open = crypto_info_open,
140 .read = seq_read,
141 .llseek = seq_lseek,
142 .release = seq_release
143 };
144
crypto_init_proc(void)145 void __init crypto_init_proc(void)
146 {
147 proc_create("crypto", 0, NULL, &proc_crypto_ops);
148 crypto_proc_fips_init();
149 }
150
crypto_exit_proc(void)151 void __exit crypto_exit_proc(void)
152 {
153 crypto_proc_fips_exit();
154 remove_proc_entry("crypto", NULL);
155 }
156