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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>
Ingo Molnar174cd4b2017-02-02 19:15:33 +010022#include <linux/sched/signal.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;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800125
126 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
127 notnum |= !isdigit(*p);
128
129 if (*p == '(') {
130 int recursion = 0;
131
132 for (;;) {
133 if (!*++p)
134 goto err_free_param;
135 if (*p == '(')
136 recursion++;
137 else if (*p == ')' && !recursion--)
138 break;
139 }
140
141 notnum = 1;
Herbert Xu720a6502007-09-28 09:06:11 +0800142 p++;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800143 }
Herbert Xucf02f5d2007-03-29 17:32:59 +1000144
145 len = p - name;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800146 if (!len)
147 goto err_free_param;
148
149 if (notnum) {
150 param->attrs[i].alg.attr.rta_len =
151 sizeof(param->attrs[i].alg);
152 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
153 memcpy(param->attrs[i].alg.data.name, name, len);
154 } else {
155 param->attrs[i].nu32.attr.rta_len =
156 sizeof(param->attrs[i].nu32);
157 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
158 param->attrs[i].nu32.data.num =
159 simple_strtol(name, NULL, 0);
160 }
161
162 param->tb[i + 1] = &param->attrs[i].attr;
163 i++;
164
Herbert Xu720a6502007-09-28 09:06:11 +0800165 if (i >= CRYPTO_MAX_ATTRS)
Herbert Xu39e1ee012007-08-29 19:27:26 +0800166 goto err_free_param;
167
168 if (*p == ')')
169 break;
170
171 if (*p != ',')
172 goto err_free_param;
Herbert Xucf02f5d2007-03-29 17:32:59 +1000173 }
174
Herbert Xu39e1ee012007-08-29 19:27:26 +0800175 if (!i)
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000176 goto err_free_param;
177
Herbert Xu39e1ee012007-08-29 19:27:26 +0800178 param->tb[i + 1] = NULL;
179
Herbert Xuebc610e2007-01-01 18:37:02 +1100180 param->type.attr.rta_len = sizeof(param->type);
181 param->type.attr.rta_type = CRYPTOA_TYPE;
Herbert Xu73d38642008-08-03 21:15:23 +0800182 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
183 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
Herbert Xu39e1ee012007-08-29 19:27:26 +0800184 param->tb[0] = &param->type.attr;
Herbert Xuebc610e2007-01-01 18:37:02 +1100185
Herbert Xu73d38642008-08-03 21:15:23 +0800186 param->otype = larval->alg.cra_flags;
187 param->omask = larval->mask;
188
Herbert Xu939e1772013-06-25 19:15:17 +0800189 crypto_alg_get(&larval->alg);
190 param->larval = larval;
Herbert Xu39871032012-06-22 20:08:29 +0800191
Herbert Xu73d38642008-08-03 21:15:23 +0800192 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
193 if (IS_ERR(thread))
Herbert Xu939e1772013-06-25 19:15:17 +0800194 goto err_put_larval;
Herbert Xu73d38642008-08-03 21:15:23 +0800195
Herbert Xu39871032012-06-22 20:08:29 +0800196 wait_for_completion_interruptible(&larval->completion);
197
Herbert Xu73d38642008-08-03 21:15:23 +0800198 return NOTIFY_STOP;
199
Herbert Xu939e1772013-06-25 19:15:17 +0800200err_put_larval:
201 crypto_alg_put(&larval->alg);
Herbert Xu73d38642008-08-03 21:15:23 +0800202err_free_param:
203 kfree(param);
204err_put_module:
205 module_put(THIS_MODULE);
206err:
207 return NOTIFY_OK;
208}
209
210static int cryptomgr_test(void *data)
211{
212 struct crypto_test_param *param = data;
213 u32 type = param->type;
214 int err = 0;
215
Herbert Xu326a6342010-08-06 09:40:28 +0800216#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
217 goto skiptest;
218#endif
219
Herbert Xu6fe4a282009-02-18 21:41:29 +0800220 if (type & CRYPTO_ALG_TESTED)
Herbert Xu73d38642008-08-03 21:15:23 +0800221 goto skiptest;
222
Herbert Xu1aa4ecd2008-08-17 17:01:56 +1000223 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
Herbert Xu73d38642008-08-03 21:15:23 +0800224
225skiptest:
226 crypto_alg_tested(param->driver, err);
227
228 kfree(param);
229 module_put_and_exit(0);
230}
231
232static int cryptomgr_schedule_test(struct crypto_alg *alg)
233{
234 struct task_struct *thread;
235 struct crypto_test_param *param;
Herbert Xu6fe4a282009-02-18 21:41:29 +0800236 u32 type;
Herbert Xu73d38642008-08-03 21:15:23 +0800237
238 if (!try_module_get(THIS_MODULE))
239 goto err;
240
241 param = kzalloc(sizeof(*param), GFP_KERNEL);
242 if (!param)
243 goto err_put_module;
244
245 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
246 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
Herbert Xu6fe4a282009-02-18 21:41:29 +0800247 type = alg->cra_flags;
248
Herbert Xueed93e02016-11-22 20:08:31 +0800249 /* Do not test internal algorithms. */
250 if (type & CRYPTO_ALG_INTERNAL)
Herbert Xu6fe4a282009-02-18 21:41:29 +0800251 type |= CRYPTO_ALG_TESTED;
252
253 param->type = type;
Herbert Xu73d38642008-08-03 21:15:23 +0800254
255 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
Herbert Xu1605b842007-05-09 13:04:39 +1000256 if (IS_ERR(thread))
Herbert Xucf02f5d2007-03-29 17:32:59 +1000257 goto err_free_param;
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000258
259 return NOTIFY_STOP;
260
261err_free_param:
262 kfree(param);
Herbert Xucf02f5d2007-03-29 17:32:59 +1000263err_put_module:
264 module_put(THIS_MODULE);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000265err:
266 return NOTIFY_OK;
267}
268
269static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
270 void *data)
271{
272 switch (msg) {
273 case CRYPTO_MSG_ALG_REQUEST:
274 return cryptomgr_schedule_probe(data);
Herbert Xu73d38642008-08-03 21:15:23 +0800275 case CRYPTO_MSG_ALG_REGISTER:
276 return cryptomgr_schedule_test(data);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000277 }
278
279 return NOTIFY_DONE;
280}
281
282static struct notifier_block cryptomgr_notifier = {
283 .notifier_call = cryptomgr_notify,
284};
285
286static int __init cryptomgr_init(void)
287{
Herbert Xuf8b0d4d2009-05-06 14:15:47 +0800288 return crypto_register_notifier(&cryptomgr_notifier);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000289}
290
291static void __exit cryptomgr_exit(void)
292{
293 int err = crypto_unregister_notifier(&cryptomgr_notifier);
294 BUG_ON(err);
295}
296
Herbert Xuda7f0332008-07-31 17:08:25 +0800297subsys_initcall(cryptomgr_init);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000298module_exit(cryptomgr_exit);
299
300MODULE_LICENSE("GPL");
301MODULE_DESCRIPTION("Crypto Algorithm Manager");