blob: 4601e4267c886182d6b037983fe2630fffb5d8dd [file] [log] [blame]
Herbert Xu2b8c19d2006-09-21 11:31:44 +10001/*
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>
Herbert Xucf02f5d2007-03-29 17:32:59 +100017#include <linux/kthread.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100018#include <linux/module.h>
19#include <linux/notifier.h>
20#include <linux/rtnetlink.h>
Herbert Xu6bfd4802006-09-21 11:39:29 +100021#include <linux/sched.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100022#include <linux/string.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100023
24#include "internal.h"
25
26struct cryptomgr_param {
Herbert Xu39e1ee02007-08-29 19:27:26 +080027 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
Herbert Xuebc610e2007-01-01 18:37:02 +110028
29 struct {
30 struct rtattr attr;
31 struct crypto_attr_type data;
32 } type;
33
Herbert Xu39e1ee02007-08-29 19:27:26 +080034 union {
Herbert Xu2b8c19d2006-09-21 11:31:44 +100035 struct rtattr attr;
Herbert Xu39e1ee02007-08-29 19:27:26 +080036 struct {
37 struct rtattr attr;
38 struct crypto_attr_alg data;
39 } alg;
40 struct {
41 struct rtattr attr;
42 struct crypto_attr_u32 data;
43 } nu32;
44 } attrs[CRYPTO_MAX_ATTRS];
Herbert Xu2b8c19d2006-09-21 11:31:44 +100045
Herbert Xu39e1ee02007-08-29 19:27:26 +080046 char larval[CRYPTO_MAX_ALG_NAME];
Herbert Xu2b8c19d2006-09-21 11:31:44 +100047 char template[CRYPTO_MAX_ALG_NAME];
Herbert Xu73d38642008-08-03 21:15:23 +080048
49 u32 otype;
50 u32 omask;
51};
52
53struct crypto_test_param {
54 char driver[CRYPTO_MAX_ALG_NAME];
55 char alg[CRYPTO_MAX_ALG_NAME];
56 u32 type;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100057};
58
Herbert Xucf02f5d2007-03-29 17:32:59 +100059static int cryptomgr_probe(void *data)
Herbert Xu2b8c19d2006-09-21 11:31:44 +100060{
Herbert Xucf02f5d2007-03-29 17:32:59 +100061 struct cryptomgr_param *param = data;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100062 struct crypto_template *tmpl;
63 struct crypto_instance *inst;
Herbert Xu6bfd4802006-09-21 11:39:29 +100064 int err;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100065
66 tmpl = crypto_lookup_template(param->template);
67 if (!tmpl)
68 goto err;
69
Herbert Xu6bfd4802006-09-21 11:39:29 +100070 do {
Herbert Xuebc610e2007-01-01 18:37:02 +110071 inst = tmpl->alloc(param->tb);
Herbert Xu6bfd4802006-09-21 11:39:29 +100072 if (IS_ERR(inst))
73 err = PTR_ERR(inst);
74 else if ((err = crypto_register_instance(tmpl, inst)))
75 tmpl->free(inst);
76 } while (err == -EAGAIN && !signal_pending(current));
Herbert Xu2b8c19d2006-09-21 11:31:44 +100077
78 crypto_tmpl_put(tmpl);
79
Herbert Xu6bfd4802006-09-21 11:39:29 +100080 if (err)
81 goto err;
82
Herbert Xu2b8c19d2006-09-21 11:31:44 +100083out:
84 kfree(param);
Herbert Xucf02f5d2007-03-29 17:32:59 +100085 module_put_and_exit(0);
Herbert Xu2b8c19d2006-09-21 11:31:44 +100086
87err:
Herbert Xu73d38642008-08-03 21:15:23 +080088 crypto_larval_error(param->larval, param->otype, param->omask);
Herbert Xu2b8c19d2006-09-21 11:31:44 +100089 goto out;
90}
91
92static int cryptomgr_schedule_probe(struct crypto_larval *larval)
93{
Herbert Xu1605b842007-05-09 13:04:39 +100094 struct task_struct *thread;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100095 struct cryptomgr_param *param;
96 const char *name = larval->alg.cra_name;
97 const char *p;
98 unsigned int len;
Herbert Xu39e1ee02007-08-29 19:27:26 +080099 int i;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000100
Herbert Xucf02f5d2007-03-29 17:32:59 +1000101 if (!try_module_get(THIS_MODULE))
102 goto err;
103
Herbert Xuebc610e2007-01-01 18:37:02 +1100104 param = kzalloc(sizeof(*param), GFP_KERNEL);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000105 if (!param)
Herbert Xucf02f5d2007-03-29 17:32:59 +1000106 goto err_put_module;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000107
108 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
109 ;
110
111 len = p - name;
112 if (!len || *p != '(')
113 goto err_free_param;
114
115 memcpy(param->template, name, len);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000116
Herbert Xu39e1ee02007-08-29 19:27:26 +0800117 i = 0;
118 for (;;) {
119 int notnum = 0;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000120
Herbert Xu39e1ee02007-08-29 19:27:26 +0800121 name = ++p;
122 len = 0;
123
124 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
125 notnum |= !isdigit(*p);
126
127 if (*p == '(') {
128 int recursion = 0;
129
130 for (;;) {
131 if (!*++p)
132 goto err_free_param;
133 if (*p == '(')
134 recursion++;
135 else if (*p == ')' && !recursion--)
136 break;
137 }
138
139 notnum = 1;
Herbert Xu720a6502007-09-28 09:06:11 +0800140 p++;
Herbert Xu39e1ee02007-08-29 19:27:26 +0800141 }
Herbert Xucf02f5d2007-03-29 17:32:59 +1000142
143 len = p - name;
Herbert Xu39e1ee02007-08-29 19:27:26 +0800144 if (!len)
145 goto err_free_param;
146
147 if (notnum) {
148 param->attrs[i].alg.attr.rta_len =
149 sizeof(param->attrs[i].alg);
150 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
151 memcpy(param->attrs[i].alg.data.name, name, len);
152 } else {
153 param->attrs[i].nu32.attr.rta_len =
154 sizeof(param->attrs[i].nu32);
155 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
156 param->attrs[i].nu32.data.num =
157 simple_strtol(name, NULL, 0);
158 }
159
160 param->tb[i + 1] = &param->attrs[i].attr;
161 i++;
162
Herbert Xu720a6502007-09-28 09:06:11 +0800163 if (i >= CRYPTO_MAX_ATTRS)
Herbert Xu39e1ee02007-08-29 19:27:26 +0800164 goto err_free_param;
165
166 if (*p == ')')
167 break;
168
169 if (*p != ',')
170 goto err_free_param;
Herbert Xucf02f5d2007-03-29 17:32:59 +1000171 }
172
Herbert Xu39e1ee02007-08-29 19:27:26 +0800173 if (!i)
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000174 goto err_free_param;
175
Herbert Xu39e1ee02007-08-29 19:27:26 +0800176 param->tb[i + 1] = NULL;
177
Herbert Xuebc610e2007-01-01 18:37:02 +1100178 param->type.attr.rta_len = sizeof(param->type);
179 param->type.attr.rta_type = CRYPTOA_TYPE;
Herbert Xu73d38642008-08-03 21:15:23 +0800180 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
181 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
Herbert Xu39e1ee02007-08-29 19:27:26 +0800182 param->tb[0] = &param->type.attr;
Herbert Xuebc610e2007-01-01 18:37:02 +1100183
Herbert Xu73d38642008-08-03 21:15:23 +0800184 param->otype = larval->alg.cra_flags;
185 param->omask = larval->mask;
186
Herbert Xu39e1ee02007-08-29 19:27:26 +0800187 memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000188
Herbert Xu73d38642008-08-03 21:15:23 +0800189 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
190 if (IS_ERR(thread))
191 goto err_free_param;
192
193 return NOTIFY_STOP;
194
195err_free_param:
196 kfree(param);
197err_put_module:
198 module_put(THIS_MODULE);
199err:
200 return NOTIFY_OK;
201}
202
203static int cryptomgr_test(void *data)
204{
205 struct crypto_test_param *param = data;
206 u32 type = param->type;
207 int err = 0;
208
209 if (!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
210 CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV))
211 goto skiptest;
212
Herbert Xu1aa4ecd2008-08-17 17:01:56 +1000213 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
Herbert Xu73d38642008-08-03 21:15:23 +0800214
215skiptest:
216 crypto_alg_tested(param->driver, err);
217
218 kfree(param);
219 module_put_and_exit(0);
220}
221
222static int cryptomgr_schedule_test(struct crypto_alg *alg)
223{
224 struct task_struct *thread;
225 struct crypto_test_param *param;
226
227 if (!try_module_get(THIS_MODULE))
228 goto err;
229
230 param = kzalloc(sizeof(*param), GFP_KERNEL);
231 if (!param)
232 goto err_put_module;
233
234 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
235 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
236 param->type = alg->cra_flags;
237
238 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
Herbert Xu1605b842007-05-09 13:04:39 +1000239 if (IS_ERR(thread))
Herbert Xucf02f5d2007-03-29 17:32:59 +1000240 goto err_free_param;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000241
242 return NOTIFY_STOP;
243
244err_free_param:
245 kfree(param);
Herbert Xucf02f5d2007-03-29 17:32:59 +1000246err_put_module:
247 module_put(THIS_MODULE);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000248err:
249 return NOTIFY_OK;
250}
251
252static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
253 void *data)
254{
255 switch (msg) {
256 case CRYPTO_MSG_ALG_REQUEST:
257 return cryptomgr_schedule_probe(data);
Herbert Xu73d38642008-08-03 21:15:23 +0800258 case CRYPTO_MSG_ALG_REGISTER:
259 return cryptomgr_schedule_test(data);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000260 }
261
262 return NOTIFY_DONE;
263}
264
265static struct notifier_block cryptomgr_notifier = {
266 .notifier_call = cryptomgr_notify,
267};
268
269static int __init cryptomgr_init(void)
270{
Herbert Xuda7f0332008-07-31 17:08:25 +0800271 int err;
272
273 err = testmgr_init();
274 if (err)
275 return err;
276
277 err = crypto_register_notifier(&cryptomgr_notifier);
278 if (err)
279 goto free_testmgr;
280
281 return 0;
282
283free_testmgr:
284 testmgr_exit();
285 return err;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000286}
287
288static void __exit cryptomgr_exit(void)
289{
290 int err = crypto_unregister_notifier(&cryptomgr_notifier);
291 BUG_ON(err);
Herbert Xuda7f0332008-07-31 17:08:25 +0800292
293 testmgr_exit();
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000294}
295
Herbert Xuda7f0332008-07-31 17:08:25 +0800296subsys_initcall(cryptomgr_init);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000297module_exit(cryptomgr_exit);
298
299MODULE_LICENSE("GPL");
300MODULE_DESCRIPTION("Crypto Algorithm Manager");