1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Create default crypto algorithm instances.
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
8 #include <crypto/internal/aead.h>
9 #include <linux/completion.h>
10 #include <linux/ctype.h>
11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/kthread.h>
14 #include <linux/module.h>
15 #include <linux/notifier.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/sched/signal.h>
18 #include <linux/slab.h>
19 #include <linux/string.h>
23 struct cryptomgr_param {
24 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
28 struct crypto_attr_type data;
33 struct crypto_attr_alg data;
34 } attrs[CRYPTO_MAX_ATTRS];
36 char template[CRYPTO_MAX_ALG_NAME];
38 struct crypto_larval *larval;
44 struct crypto_test_param {
45 char driver[CRYPTO_MAX_ALG_NAME];
46 char alg[CRYPTO_MAX_ALG_NAME];
50 static int cryptomgr_probe(void *data)
52 struct cryptomgr_param *param = data;
53 struct crypto_template *tmpl;
56 tmpl = crypto_lookup_template(param->template);
61 err = tmpl->create(tmpl, param->tb);
62 } while (err == -EAGAIN && !signal_pending(current));
64 crypto_tmpl_put(tmpl);
67 complete_all(¶m->larval->completion);
68 crypto_alg_put(¶m->larval->alg);
70 module_put_and_kthread_exit(0);
73 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
75 struct task_struct *thread;
76 struct cryptomgr_param *param;
77 const char *name = larval->alg.cra_name;
82 if (!try_module_get(THIS_MODULE))
85 param = kzalloc(sizeof(*param), GFP_KERNEL);
89 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
93 if (!len || *p != '(')
96 memcpy(param->template, name, len);
102 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
113 else if (*p == ')' && !recursion--)
124 param->attrs[i].attr.rta_len = sizeof(param->attrs[i]);
125 param->attrs[i].attr.rta_type = CRYPTOA_ALG;
126 memcpy(param->attrs[i].data.name, name, len);
128 param->tb[i + 1] = ¶m->attrs[i].attr;
131 if (i >= CRYPTO_MAX_ATTRS)
144 param->tb[i + 1] = NULL;
146 param->type.attr.rta_len = sizeof(param->type);
147 param->type.attr.rta_type = CRYPTOA_TYPE;
148 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
149 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
150 param->tb[0] = ¶m->type.attr;
152 param->otype = larval->alg.cra_flags;
153 param->omask = larval->mask;
155 crypto_alg_get(&larval->alg);
156 param->larval = larval;
158 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
165 crypto_alg_put(&larval->alg);
169 module_put(THIS_MODULE);
174 static int cryptomgr_test(void *data)
176 struct crypto_test_param *param = data;
177 u32 type = param->type;
180 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
184 if (type & CRYPTO_ALG_TESTED)
187 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
190 crypto_alg_tested(param->driver, err);
193 module_put_and_kthread_exit(0);
196 static int cryptomgr_schedule_test(struct crypto_alg *alg)
198 struct task_struct *thread;
199 struct crypto_test_param *param;
202 if (!try_module_get(THIS_MODULE))
205 param = kzalloc(sizeof(*param), GFP_KERNEL);
209 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
210 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
211 type = alg->cra_flags;
213 /* Do not test internal algorithms. */
214 if (type & CRYPTO_ALG_INTERNAL)
215 type |= CRYPTO_ALG_TESTED;
219 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
228 module_put(THIS_MODULE);
233 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
237 case CRYPTO_MSG_ALG_REQUEST:
238 return cryptomgr_schedule_probe(data);
239 case CRYPTO_MSG_ALG_REGISTER:
240 return cryptomgr_schedule_test(data);
241 case CRYPTO_MSG_ALG_LOADED:
248 static struct notifier_block cryptomgr_notifier = {
249 .notifier_call = cryptomgr_notify,
252 static int __init cryptomgr_init(void)
254 return crypto_register_notifier(&cryptomgr_notifier);
257 static void __exit cryptomgr_exit(void)
259 int err = crypto_unregister_notifier(&cryptomgr_notifier);
264 * This is arch_initcall() so that the crypto self-tests are run on algorithms
265 * registered early by subsys_initcall(). subsys_initcall() is needed for
266 * generic implementations so that they're available for comparison tests when
267 * other implementations are registered later by module_init().
269 arch_initcall(cryptomgr_init);
270 module_exit(cryptomgr_exit);
272 MODULE_LICENSE("GPL");
273 MODULE_DESCRIPTION("Crypto Algorithm Manager");