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 "internal.h"
23
24static void *c_start(struct seq_file *m, loff_t *pos)
25{
26	struct list_head *v;
27	loff_t n = *pos;
28
29	down_read(&crypto_alg_sem);
30	list_for_each(v, &crypto_alg_list)
31		if (!n--)
32			return list_entry(v, struct crypto_alg, cra_list);
33	return NULL;
34}
35
36static void *c_next(struct seq_file *m, void *p, loff_t *pos)
37{
38	struct list_head *v = p;
39
40	(*pos)++;
41	v = v->next;
42	return (v == &crypto_alg_list) ?
43		NULL : list_entry(v, struct crypto_alg, cra_list);
44}
45
46static void c_stop(struct seq_file *m, void *p)
47{
48	up_read(&crypto_alg_sem);
49}
50
51static int c_show(struct seq_file *m, void *p)
52{
53	struct crypto_alg *alg = (struct crypto_alg *)p;
54
55	seq_printf(m, "name         : %s\n", alg->cra_name);
56	seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
57	seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
58	seq_printf(m, "priority     : %d\n", alg->cra_priority);
59	seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
60
61	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
62	case CRYPTO_ALG_TYPE_CIPHER:
63		seq_printf(m, "type         : cipher\n");
64		seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
65		seq_printf(m, "min keysize  : %u\n",
66					alg->cra_cipher.cia_min_keysize);
67		seq_printf(m, "max keysize  : %u\n",
68					alg->cra_cipher.cia_max_keysize);
69		break;
70
71	case CRYPTO_ALG_TYPE_DIGEST:
72		seq_printf(m, "type         : digest\n");
73		seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
74		seq_printf(m, "digestsize   : %u\n",
75		           alg->cra_digest.dia_digestsize);
76		break;
77	case CRYPTO_ALG_TYPE_COMPRESS:
78		seq_printf(m, "type         : compression\n");
79		break;
80	default:
81		if (alg->cra_type && alg->cra_type->show)
82			alg->cra_type->show(m, alg);
83		else
84			seq_printf(m, "type         : unknown\n");
85		break;
86	}
87
88	seq_putc(m, '\n');
89	return 0;
90}
91
92static struct seq_operations crypto_seq_ops = {
93	.start		= c_start,
94	.next		= c_next,
95	.stop		= c_stop,
96	.show		= c_show
97};
98
99static int crypto_info_open(struct inode *inode, struct file *file)
100{
101	return seq_open(file, &crypto_seq_ops);
102}
103
104static const struct file_operations proc_crypto_ops = {
105	.open		= crypto_info_open,
106	.read		= seq_read,
107	.llseek		= seq_lseek,
108	.release	= seq_release
109};
110
111void __init crypto_init_proc(void)
112{
113	struct proc_dir_entry *proc;
114
115	proc = create_proc_entry("crypto", 0, NULL);
116	if (proc)
117		proc->proc_fops = &proc_crypto_ops;
118}
119
120void __exit crypto_exit_proc(void)
121{
122	remove_proc_entry("crypto", NULL);
123}
124