Root/crypto/proc.c

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 <asm/atomic.h>
17#include <linux/init.h>
18#include <linux/crypto.h>
19#include <linux/rwsem.h>
20#include <linux/proc_fs.h>
21#include <linux/seq_file.h>
22#include <linux/sysctl.h>
23#include "internal.h"
24
25#ifdef CONFIG_CRYPTO_FIPS
26static struct ctl_table crypto_sysctl_table[] = {
27    {
28        .procname = "fips_enabled",
29        .data = &fips_enabled,
30        .maxlen = sizeof(int),
31        .mode = 0444,
32        .proc_handler = proc_dointvec
33    },
34    {}
35};
36
37static struct ctl_table crypto_dir_table[] = {
38    {
39        .procname = "crypto",
40        .mode = 0555,
41        .child = crypto_sysctl_table
42    },
43    {}
44};
45
46static struct ctl_table_header *crypto_sysctls;
47
48static void crypto_proc_fips_init(void)
49{
50    crypto_sysctls = register_sysctl_table(crypto_dir_table);
51}
52
53static void crypto_proc_fips_exit(void)
54{
55    if (crypto_sysctls)
56        unregister_sysctl_table(crypto_sysctls);
57}
58#else
59#define crypto_proc_fips_init()
60#define crypto_proc_fips_exit()
61#endif
62
63static void *c_start(struct seq_file *m, loff_t *pos)
64{
65    down_read(&crypto_alg_sem);
66    return seq_list_start(&crypto_alg_list, *pos);
67}
68
69static void *c_next(struct seq_file *m, void *p, loff_t *pos)
70{
71    return seq_list_next(p, &crypto_alg_list, pos);
72}
73
74static void c_stop(struct seq_file *m, void *p)
75{
76    up_read(&crypto_alg_sem);
77}
78
79static int c_show(struct seq_file *m, void *p)
80{
81    struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
82    
83    seq_printf(m, "name : %s\n", alg->cra_name);
84    seq_printf(m, "driver : %s\n", alg->cra_driver_name);
85    seq_printf(m, "module : %s\n", module_name(alg->cra_module));
86    seq_printf(m, "priority : %d\n", alg->cra_priority);
87    seq_printf(m, "refcnt : %d\n", atomic_read(&alg->cra_refcnt));
88    seq_printf(m, "selftest : %s\n",
89           (alg->cra_flags & CRYPTO_ALG_TESTED) ?
90           "passed" : "unknown");
91
92    if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
93        seq_printf(m, "type : larval\n");
94        seq_printf(m, "flags : 0x%x\n", alg->cra_flags);
95        goto out;
96    }
97
98    if (alg->cra_type && alg->cra_type->show) {
99        alg->cra_type->show(m, alg);
100        goto out;
101    }
102    
103    switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
104    case CRYPTO_ALG_TYPE_CIPHER:
105        seq_printf(m, "type : cipher\n");
106        seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
107        seq_printf(m, "min keysize : %u\n",
108                    alg->cra_cipher.cia_min_keysize);
109        seq_printf(m, "max keysize : %u\n",
110                    alg->cra_cipher.cia_max_keysize);
111        break;
112    case CRYPTO_ALG_TYPE_COMPRESS:
113        seq_printf(m, "type : compression\n");
114        break;
115    default:
116        seq_printf(m, "type : unknown\n");
117        break;
118    }
119
120out:
121    seq_putc(m, '\n');
122    return 0;
123}
124
125static const struct seq_operations crypto_seq_ops = {
126    .start = c_start,
127    .next = c_next,
128    .stop = c_stop,
129    .show = c_show
130};
131
132static int crypto_info_open(struct inode *inode, struct file *file)
133{
134    return seq_open(file, &crypto_seq_ops);
135}
136        
137static const struct file_operations proc_crypto_ops = {
138    .open = crypto_info_open,
139    .read = seq_read,
140    .llseek = seq_lseek,
141    .release = seq_release
142};
143
144void __init crypto_init_proc(void)
145{
146    proc_create("crypto", 0, NULL, &proc_crypto_ops);
147    crypto_proc_fips_init();
148}
149
150void __exit crypto_exit_proc(void)
151{
152    crypto_proc_fips_exit();
153    remove_proc_entry("crypto", NULL);
154}
155

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