[CRYPTO] padlock: Remove pointless padlock module
[linux-2.6-block.git] / crypto / cryptomgr.c
CommitLineData
2b8c19db
HX
1/*
2 * Create default crypto algorithm instances.
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/crypto.h>
14#include <linux/ctype.h>
15#include <linux/err.h>
16#include <linux/init.h>
cf02f5da 17#include <linux/kthread.h>
2b8c19db
HX
18#include <linux/module.h>
19#include <linux/notifier.h>
20#include <linux/rtnetlink.h>
6bfd4809 21#include <linux/sched.h>
2b8c19db 22#include <linux/string.h>
2b8c19db
HX
23
24#include "internal.h"
25
26struct cryptomgr_param {
cf02f5da 27 struct task_struct *thread;
2b8c19db 28
ebc610e5
HX
29 struct rtattr *tb[CRYPTOA_MAX];
30
31 struct {
32 struct rtattr attr;
33 struct crypto_attr_type data;
34 } type;
35
2b8c19db
HX
36 struct {
37 struct rtattr attr;
38 struct crypto_attr_alg data;
39 } alg;
40
41 struct {
42 char name[CRYPTO_MAX_ALG_NAME];
43 } larval;
44
45 char template[CRYPTO_MAX_ALG_NAME];
46};
47
cf02f5da 48static int cryptomgr_probe(void *data)
2b8c19db 49{
cf02f5da 50 struct cryptomgr_param *param = data;
2b8c19db
HX
51 struct crypto_template *tmpl;
52 struct crypto_instance *inst;
6bfd4809 53 int err;
2b8c19db
HX
54
55 tmpl = crypto_lookup_template(param->template);
56 if (!tmpl)
57 goto err;
58
6bfd4809 59 do {
ebc610e5 60 inst = tmpl->alloc(param->tb);
6bfd4809
HX
61 if (IS_ERR(inst))
62 err = PTR_ERR(inst);
63 else if ((err = crypto_register_instance(tmpl, inst)))
64 tmpl->free(inst);
65 } while (err == -EAGAIN && !signal_pending(current));
2b8c19db
HX
66
67 crypto_tmpl_put(tmpl);
68
6bfd4809
HX
69 if (err)
70 goto err;
71
2b8c19db
HX
72out:
73 kfree(param);
cf02f5da 74 module_put_and_exit(0);
2b8c19db
HX
75
76err:
ebc610e5
HX
77 crypto_larval_error(param->larval.name, param->type.data.type,
78 param->type.data.mask);
2b8c19db
HX
79 goto out;
80}
81
82static int cryptomgr_schedule_probe(struct crypto_larval *larval)
83{
84 struct cryptomgr_param *param;
85 const char *name = larval->alg.cra_name;
86 const char *p;
87 unsigned int len;
88
cf02f5da
HX
89 if (!try_module_get(THIS_MODULE))
90 goto err;
91
ebc610e5 92 param = kzalloc(sizeof(*param), GFP_KERNEL);
2b8c19db 93 if (!param)
cf02f5da 94 goto err_put_module;
2b8c19db
HX
95
96 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
97 ;
98
99 len = p - name;
100 if (!len || *p != '(')
101 goto err_free_param;
102
103 memcpy(param->template, name, len);
2b8c19db
HX
104
105 name = p + 1;
cf02f5da
HX
106 len = 0;
107 for (p = name; *p; p++) {
108 for (; isalnum(*p) || *p == '-' || *p == '_' || *p == '('; p++)
109 ;
2b8c19db 110
cf02f5da
HX
111 if (*p != ')')
112 goto err_free_param;
113
114 len = p - name;
115 }
116
117 if (!len || name[len + 1])
2b8c19db
HX
118 goto err_free_param;
119
ebc610e5
HX
120 param->type.attr.rta_len = sizeof(param->type);
121 param->type.attr.rta_type = CRYPTOA_TYPE;
122 param->type.data.type = larval->alg.cra_flags;
123 param->type.data.mask = larval->mask;
124 param->tb[CRYPTOA_TYPE - 1] = &param->type.attr;
125
2b8c19db
HX
126 param->alg.attr.rta_len = sizeof(param->alg);
127 param->alg.attr.rta_type = CRYPTOA_ALG;
128 memcpy(param->alg.data.name, name, len);
ebc610e5 129 param->tb[CRYPTOA_ALG - 1] = &param->alg.attr;
2b8c19db
HX
130
131 memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
132
cf02f5da
HX
133 param->thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
134 if (IS_ERR(param->thread))
135 goto err_free_param;
2b8c19db
HX
136
137 return NOTIFY_STOP;
138
139err_free_param:
140 kfree(param);
cf02f5da
HX
141err_put_module:
142 module_put(THIS_MODULE);
2b8c19db
HX
143err:
144 return NOTIFY_OK;
145}
146
147static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
148 void *data)
149{
150 switch (msg) {
151 case CRYPTO_MSG_ALG_REQUEST:
152 return cryptomgr_schedule_probe(data);
153 }
154
155 return NOTIFY_DONE;
156}
157
158static struct notifier_block cryptomgr_notifier = {
159 .notifier_call = cryptomgr_notify,
160};
161
162static int __init cryptomgr_init(void)
163{
164 return crypto_register_notifier(&cryptomgr_notifier);
165}
166
167static void __exit cryptomgr_exit(void)
168{
169 int err = crypto_unregister_notifier(&cryptomgr_notifier);
170 BUG_ON(err);
171}
172
173module_init(cryptomgr_init);
174module_exit(cryptomgr_exit);
175
176MODULE_LICENSE("GPL");
177MODULE_DESCRIPTION("Crypto Algorithm Manager");