1 /*
2 * Scatterlist Cryptographic API.
3 *
4 * Procfs information.
5 *
6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 */
14 #include <linux/init.h>
15 #include <linux/crypto.h>
16 #include <linux/rwsem.h>
17 #include <linux/proc_fs.h>
18 #include <linux/seq_file.h>
19 #include "internal.h"
20
21 extern struct list_head crypto_alg_list;
22 extern struct rw_semaphore crypto_alg_sem;
23
c_start(struct seq_file * m,loff_t * pos)24 static 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
c_next(struct seq_file * m,void * p,loff_t * pos)36 static 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
c_stop(struct seq_file * m,void * p)46 static void c_stop(struct seq_file *m, void *p)
47 {
48 up_read(&crypto_alg_sem);
49 }
50
c_show(struct seq_file * m,void * p)51 static 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, "module : %s\n",
57 (alg->cra_module ?
58 alg->cra_module->name :
59 "kernel"));
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 seq_printf(m, "type : unknown\n");
82 break;
83 }
84
85 seq_putc(m, '\n');
86 return 0;
87 }
88
89 static struct seq_operations crypto_seq_ops = {
90 .start = c_start,
91 .next = c_next,
92 .stop = c_stop,
93 .show = c_show
94 };
95
crypto_info_open(struct inode * inode,struct file * file)96 static int crypto_info_open(struct inode *inode, struct file *file)
97 {
98 return seq_open(file, &crypto_seq_ops);
99 }
100
101 static struct file_operations proc_crypto_ops = {
102 .open = crypto_info_open,
103 .read = seq_read,
104 .llseek = seq_lseek,
105 .release = seq_release
106 };
107
crypto_init_proc(void)108 void __init crypto_init_proc(void)
109 {
110 struct proc_dir_entry *proc;
111
112 proc = create_proc_entry("crypto", 0, NULL);
113 if (proc)
114 proc->proc_fops = &proc_crypto_ops;
115 }
116