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 <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
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
121out:
122    seq_putc(m, '\n');
123    return 0;
124}
125
126static 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
133static int crypto_info_open(struct inode *inode, struct file *file)
134{
135    return seq_open(file, &crypto_seq_ops);
136}
137        
138static 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
145void __init crypto_init_proc(void)
146{
147    proc_create("crypto", 0, NULL, &proc_crypto_ops);
148    crypto_proc_fips_init();
149}
150
151void __exit crypto_exit_proc(void)
152{
153    crypto_proc_fips_exit();
154    remove_proc_entry("crypto", NULL);
155}
156

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