xref: /openbmc/linux/crypto/proc.c (revision ddc141e5)
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 "internal.h"
24 
25 static void *c_start(struct seq_file *m, loff_t *pos)
26 {
27 	down_read(&crypto_alg_sem);
28 	return seq_list_start(&crypto_alg_list, *pos);
29 }
30 
31 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
32 {
33 	return seq_list_next(p, &crypto_alg_list, pos);
34 }
35 
36 static void c_stop(struct seq_file *m, void *p)
37 {
38 	up_read(&crypto_alg_sem);
39 }
40 
41 static int c_show(struct seq_file *m, void *p)
42 {
43 	struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
44 
45 	seq_printf(m, "name         : %s\n", alg->cra_name);
46 	seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
47 	seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
48 	seq_printf(m, "priority     : %d\n", alg->cra_priority);
49 	seq_printf(m, "refcnt       : %u\n", refcount_read(&alg->cra_refcnt));
50 	seq_printf(m, "selftest     : %s\n",
51 		   (alg->cra_flags & CRYPTO_ALG_TESTED) ?
52 		   "passed" : "unknown");
53 	seq_printf(m, "internal     : %s\n",
54 		   (alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
55 		   "yes" : "no");
56 
57 	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
58 		seq_printf(m, "type         : larval\n");
59 		seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
60 		goto out;
61 	}
62 
63 	if (alg->cra_type && alg->cra_type->show) {
64 		alg->cra_type->show(m, alg);
65 		goto out;
66 	}
67 
68 	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
69 	case CRYPTO_ALG_TYPE_CIPHER:
70 		seq_printf(m, "type         : cipher\n");
71 		seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
72 		seq_printf(m, "min keysize  : %u\n",
73 					alg->cra_cipher.cia_min_keysize);
74 		seq_printf(m, "max keysize  : %u\n",
75 					alg->cra_cipher.cia_max_keysize);
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 out:
86 	seq_putc(m, '\n');
87 	return 0;
88 }
89 
90 static const struct seq_operations crypto_seq_ops = {
91 	.start		= c_start,
92 	.next		= c_next,
93 	.stop		= c_stop,
94 	.show		= c_show
95 };
96 
97 static int crypto_info_open(struct inode *inode, struct file *file)
98 {
99 	return seq_open(file, &crypto_seq_ops);
100 }
101 
102 static const struct file_operations proc_crypto_ops = {
103 	.open		= crypto_info_open,
104 	.read		= seq_read,
105 	.llseek		= seq_lseek,
106 	.release	= seq_release
107 };
108 
109 void __init crypto_init_proc(void)
110 {
111 	proc_create("crypto", 0, NULL, &proc_crypto_ops);
112 }
113 
114 void __exit crypto_exit_proc(void)
115 {
116 	remove_proc_entry("crypto", NULL);
117 }
118