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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
Herbert Xu6fe4a282009-02-18 21:41:29 +080013#include <crypto/internal/aead.h>
Herbert Xu39871032012-06-22 20:08:29 +080014#include <linux/completion.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100015#include <linux/ctype.h>
16#include <linux/err.h>
17#include <linux/init.h>
Herbert Xucf02f5d2007-03-29 17:32:59 +100018#include <linux/kthread.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100019#include <linux/module.h>
20#include <linux/notifier.h>
21#include <linux/rtnetlink.h>
Herbert Xu6bfd4802006-09-21 11:39:29 +100022#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100024#include <linux/string.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100025
26#include "internal.h"
27
28struct cryptomgr_param {
Herbert Xu39e1ee012007-08-29 19:27:26 +080029 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
Herbert Xuebc610e2007-01-01 18:37:02 +110030
31 struct {
32 struct rtattr attr;
33 struct crypto_attr_type data;
34 } type;
35
Herbert Xu39e1ee012007-08-29 19:27:26 +080036 union {
Herbert Xu2b8c19d2006-09-21 11:31:44 +100037 struct rtattr attr;
Herbert Xu39e1ee012007-08-29 19:27:26 +080038 struct {
39 struct rtattr attr;
40 struct crypto_attr_alg data;
41 } alg;
42 struct {
43 struct rtattr attr;
44 struct crypto_attr_u32 data;
45 } nu32;
46 } attrs[CRYPTO_MAX_ATTRS];
Herbert Xu2b8c19d2006-09-21 11:31:44 +100047
Herbert Xu2b8c19d2006-09-21 11:31:44 +100048 char template[CRYPTO_MAX_ALG_NAME];
Herbert Xu73d38642008-08-03 21:15:23 +080049
Herbert Xu939e1772013-06-25 19:15:17 +080050 struct crypto_larval *larval;
Herbert Xu39871032012-06-22 20:08:29 +080051
Herbert Xu73d38642008-08-03 21:15:23 +080052 u32 otype;
53 u32 omask;
54};
55
56struct crypto_test_param {
57 char driver[CRYPTO_MAX_ALG_NAME];
58 char alg[CRYPTO_MAX_ALG_NAME];
59 u32 type;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100060};
61
Herbert Xucf02f5d2007-03-29 17:32:59 +100062static int cryptomgr_probe(void *data)
Herbert Xu2b8c19d2006-09-21 11:31:44 +100063{
Herbert Xucf02f5d2007-03-29 17:32:59 +100064 struct cryptomgr_param *param = data;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100065 struct crypto_template *tmpl;
66 struct crypto_instance *inst;
Herbert Xu6bfd4802006-09-21 11:39:29 +100067 int err;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100068
69 tmpl = crypto_lookup_template(param->template);
70 if (!tmpl)
Herbert Xu39871032012-06-22 20:08:29 +080071 goto out;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100072
Herbert Xu6bfd4802006-09-21 11:39:29 +100073 do {
Herbert Xuf2ac72e2009-07-07 12:30:33 +080074 if (tmpl->create) {
75 err = tmpl->create(tmpl, param->tb);
76 continue;
77 }
78
Herbert Xuebc610e2007-01-01 18:37:02 +110079 inst = tmpl->alloc(param->tb);
Herbert Xu6bfd4802006-09-21 11:39:29 +100080 if (IS_ERR(inst))
81 err = PTR_ERR(inst);
82 else if ((err = crypto_register_instance(tmpl, inst)))
83 tmpl->free(inst);
84 } while (err == -EAGAIN && !signal_pending(current));
Herbert Xu2b8c19d2006-09-21 11:31:44 +100085
86 crypto_tmpl_put(tmpl);
87
88out:
Herbert Xu939e1772013-06-25 19:15:17 +080089 complete_all(&param->larval->completion);
90 crypto_alg_put(&param->larval->alg);
Herbert Xu2b8c19d2006-09-21 11:31:44 +100091 kfree(param);
Herbert Xucf02f5d2007-03-29 17:32:59 +100092 module_put_and_exit(0);
Herbert Xu2b8c19d2006-09-21 11:31:44 +100093}
94
95static int cryptomgr_schedule_probe(struct crypto_larval *larval)
96{
Herbert Xu1605b842007-05-09 13:04:39 +100097 struct task_struct *thread;
Herbert Xu2b8c19d2006-09-21 11:31:44 +100098 struct cryptomgr_param *param;
99 const char *name = larval->alg.cra_name;
100 const char *p;
101 unsigned int len;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800102 int i;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000103
Herbert Xucf02f5d2007-03-29 17:32:59 +1000104 if (!try_module_get(THIS_MODULE))
105 goto err;
106
Herbert Xuebc610e2007-01-01 18:37:02 +1100107 param = kzalloc(sizeof(*param), GFP_KERNEL);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000108 if (!param)
Herbert Xucf02f5d2007-03-29 17:32:59 +1000109 goto err_put_module;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000110
111 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
112 ;
113
114 len = p - name;
115 if (!len || *p != '(')
116 goto err_free_param;
117
118 memcpy(param->template, name, len);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000119
Herbert Xu39e1ee012007-08-29 19:27:26 +0800120 i = 0;
121 for (;;) {
122 int notnum = 0;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000123
Herbert Xu39e1ee012007-08-29 19:27:26 +0800124 name = ++p;
125 len = 0;
126
127 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
128 notnum |= !isdigit(*p);
129
130 if (*p == '(') {
131 int recursion = 0;
132
133 for (;;) {
134 if (!*++p)
135 goto err_free_param;
136 if (*p == '(')
137 recursion++;
138 else if (*p == ')' && !recursion--)
139 break;
140 }
141
142 notnum = 1;
Herbert Xu720a6502007-09-28 09:06:11 +0800143 p++;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800144 }
Herbert Xucf02f5d2007-03-29 17:32:59 +1000145
146 len = p - name;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800147 if (!len)
148 goto err_free_param;
149
150 if (notnum) {
151 param->attrs[i].alg.attr.rta_len =
152 sizeof(param->attrs[i].alg);
153 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
154 memcpy(param->attrs[i].alg.data.name, name, len);
155 } else {
156 param->attrs[i].nu32.attr.rta_len =
157 sizeof(param->attrs[i].nu32);
158 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
159 param->attrs[i].nu32.data.num =
160 simple_strtol(name, NULL, 0);
161 }
162
163 param->tb[i + 1] = &param->attrs[i].attr;
164 i++;
165
Herbert Xu720a6502007-09-28 09:06:11 +0800166 if (i >= CRYPTO_MAX_ATTRS)
Herbert Xu39e1ee012007-08-29 19:27:26 +0800167 goto err_free_param;
168
169 if (*p == ')')
170 break;
171
172 if (*p != ',')
173 goto err_free_param;
Herbert Xucf02f5d2007-03-29 17:32:59 +1000174 }
175
Herbert Xu39e1ee012007-08-29 19:27:26 +0800176 if (!i)
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000177 goto err_free_param;
178
Herbert Xu39e1ee012007-08-29 19:27:26 +0800179 param->tb[i + 1] = NULL;
180
Herbert Xuebc610e2007-01-01 18:37:02 +1100181 param->type.attr.rta_len = sizeof(param->type);
182 param->type.attr.rta_type = CRYPTOA_TYPE;
Herbert Xu73d38642008-08-03 21:15:23 +0800183 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
184 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800185 param->tb[0] = &param->type.attr;
Herbert Xuebc610e2007-01-01 18:37:02 +1100186
Herbert Xu73d38642008-08-03 21:15:23 +0800187 param->otype = larval->alg.cra_flags;
188 param->omask = larval->mask;
189
Herbert Xu939e1772013-06-25 19:15:17 +0800190 crypto_alg_get(&larval->alg);
191 param->larval = larval;
Herbert Xu39871032012-06-22 20:08:29 +0800192
Herbert Xu73d38642008-08-03 21:15:23 +0800193 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
194 if (IS_ERR(thread))
Herbert Xu939e1772013-06-25 19:15:17 +0800195 goto err_put_larval;
Herbert Xu73d38642008-08-03 21:15:23 +0800196
Herbert Xu39871032012-06-22 20:08:29 +0800197 wait_for_completion_interruptible(&larval->completion);
198
Herbert Xu73d38642008-08-03 21:15:23 +0800199 return NOTIFY_STOP;
200
Herbert Xu939e1772013-06-25 19:15:17 +0800201err_put_larval:
202 crypto_alg_put(&larval->alg);
Herbert Xu73d38642008-08-03 21:15:23 +0800203err_free_param:
204 kfree(param);
205err_put_module:
206 module_put(THIS_MODULE);
207err:
208 return NOTIFY_OK;
209}
210
211static int cryptomgr_test(void *data)
212{
213 struct crypto_test_param *param = data;
214 u32 type = param->type;
215 int err = 0;
216
Herbert Xu326a6342010-08-06 09:40:28 +0800217#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
218 goto skiptest;
219#endif
220
Herbert Xu6fe4a282009-02-18 21:41:29 +0800221 if (type & CRYPTO_ALG_TESTED)
Herbert Xu73d38642008-08-03 21:15:23 +0800222 goto skiptest;
223
Herbert Xu1aa4ecd2008-08-17 17:01:56 +1000224 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
Herbert Xu73d38642008-08-03 21:15:23 +0800225
226skiptest:
227 crypto_alg_tested(param->driver, err);
228
229 kfree(param);
230 module_put_and_exit(0);
231}
232
233static int cryptomgr_schedule_test(struct crypto_alg *alg)
234{
235 struct task_struct *thread;
236 struct crypto_test_param *param;
Herbert Xu6fe4a282009-02-18 21:41:29 +0800237 u32 type;
Herbert Xu73d38642008-08-03 21:15:23 +0800238
239 if (!try_module_get(THIS_MODULE))
240 goto err;
241
242 param = kzalloc(sizeof(*param), GFP_KERNEL);
243 if (!param)
244 goto err_put_module;
245
246 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
247 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
Herbert Xu6fe4a282009-02-18 21:41:29 +0800248 type = alg->cra_flags;
249
Herbert Xueed93e02016-11-22 20:08:31 +0800250 /* Do not test internal algorithms. */
251 if (type & CRYPTO_ALG_INTERNAL)
Herbert Xu6fe4a282009-02-18 21:41:29 +0800252 type |= CRYPTO_ALG_TESTED;
253
254 param->type = type;
Herbert Xu73d38642008-08-03 21:15:23 +0800255
256 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
Herbert Xu1605b842007-05-09 13:04:39 +1000257 if (IS_ERR(thread))
Herbert Xucf02f5d2007-03-29 17:32:59 +1000258 goto err_free_param;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000259
260 return NOTIFY_STOP;
261
262err_free_param:
263 kfree(param);
Herbert Xucf02f5d2007-03-29 17:32:59 +1000264err_put_module:
265 module_put(THIS_MODULE);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000266err:
267 return NOTIFY_OK;
268}
269
270static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
271 void *data)
272{
273 switch (msg) {
274 case CRYPTO_MSG_ALG_REQUEST:
275 return cryptomgr_schedule_probe(data);
Herbert Xu73d38642008-08-03 21:15:23 +0800276 case CRYPTO_MSG_ALG_REGISTER:
277 return cryptomgr_schedule_test(data);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000278 }
279
280 return NOTIFY_DONE;
281}
282
283static struct notifier_block cryptomgr_notifier = {
284 .notifier_call = cryptomgr_notify,
285};
286
287static int __init cryptomgr_init(void)
288{
Herbert Xuf8b0d4d2009-05-06 14:15:47 +0800289 return crypto_register_notifier(&cryptomgr_notifier);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000290}
291
292static void __exit cryptomgr_exit(void)
293{
294 int err = crypto_unregister_notifier(&cryptomgr_notifier);
295 BUG_ON(err);
296}
297
Herbert Xuda7f0332008-07-31 17:08:25 +0800298subsys_initcall(cryptomgr_init);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000299module_exit(cryptomgr_exit);
300
301MODULE_LICENSE("GPL");
302MODULE_DESCRIPTION("Crypto Algorithm Manager");