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;
35 struct crypto_attr_alg data;
39 struct crypto_attr_u32 data;
41 } attrs[CRYPTO_MAX_ATTRS];
43 char template[CRYPTO_MAX_ALG_NAME];
45 struct crypto_larval *larval;
51 struct crypto_test_param {
52 char driver[CRYPTO_MAX_ALG_NAME];
53 char alg[CRYPTO_MAX_ALG_NAME];
57 static int cryptomgr_probe(void *data)
59 struct cryptomgr_param *param = data;
60 struct crypto_template *tmpl;
63 tmpl = crypto_lookup_template(param->template);
68 err = tmpl->create(tmpl, param->tb);
69 } while (err == -EAGAIN && !signal_pending(current));
71 crypto_tmpl_put(tmpl);
74 complete_all(¶m->larval->completion);
75 crypto_alg_put(¶m->larval->alg);
77 module_put_and_exit(0);
80 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
82 struct task_struct *thread;
83 struct cryptomgr_param *param;
84 const char *name = larval->alg.cra_name;
89 if (!try_module_get(THIS_MODULE))
92 param = kzalloc(sizeof(*param), GFP_KERNEL);
96 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
100 if (!len || *p != '(')
103 memcpy(param->template, name, len);
111 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
112 notnum |= !isdigit(*p);
122 else if (*p == ')' && !recursion--)
135 param->attrs[i].alg.attr.rta_len =
136 sizeof(param->attrs[i].alg);
137 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
138 memcpy(param->attrs[i].alg.data.name, name, len);
140 param->attrs[i].nu32.attr.rta_len =
141 sizeof(param->attrs[i].nu32);
142 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
143 param->attrs[i].nu32.data.num =
144 simple_strtol(name, NULL, 0);
147 param->tb[i + 1] = ¶m->attrs[i].attr;
150 if (i >= CRYPTO_MAX_ATTRS)
163 param->tb[i + 1] = NULL;
165 param->type.attr.rta_len = sizeof(param->type);
166 param->type.attr.rta_type = CRYPTOA_TYPE;
167 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
168 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
169 param->tb[0] = ¶m->type.attr;
171 param->otype = larval->alg.cra_flags;
172 param->omask = larval->mask;
174 crypto_alg_get(&larval->alg);
175 param->larval = larval;
177 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
184 crypto_alg_put(&larval->alg);
188 module_put(THIS_MODULE);
193 static int cryptomgr_test(void *data)
195 struct crypto_test_param *param = data;
196 u32 type = param->type;
199 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
203 if (type & CRYPTO_ALG_TESTED)
206 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
209 crypto_alg_tested(param->driver, err);
212 module_put_and_exit(0);
215 static int cryptomgr_schedule_test(struct crypto_alg *alg)
217 struct task_struct *thread;
218 struct crypto_test_param *param;
221 if (!try_module_get(THIS_MODULE))
224 param = kzalloc(sizeof(*param), GFP_KERNEL);
228 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
229 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
230 type = alg->cra_flags;
232 /* Do not test internal algorithms. */
233 if (type & CRYPTO_ALG_INTERNAL)
234 type |= CRYPTO_ALG_TESTED;
238 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
247 module_put(THIS_MODULE);
252 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
256 case CRYPTO_MSG_ALG_REQUEST:
257 return cryptomgr_schedule_probe(data);
258 case CRYPTO_MSG_ALG_REGISTER:
259 return cryptomgr_schedule_test(data);
260 case CRYPTO_MSG_ALG_LOADED:
267 static struct notifier_block cryptomgr_notifier = {
268 .notifier_call = cryptomgr_notify,
271 static int __init cryptomgr_init(void)
273 return crypto_register_notifier(&cryptomgr_notifier);
276 static void __exit cryptomgr_exit(void)
278 int err = crypto_unregister_notifier(&cryptomgr_notifier);
283 * This is arch_initcall() so that the crypto self-tests are run on algorithms
284 * registered early by subsys_initcall(). subsys_initcall() is needed for
285 * generic implementations so that they're available for comparison tests when
286 * other implementations are registered later by module_init().
288 arch_initcall(cryptomgr_init);
289 module_exit(cryptomgr_exit);
291 MODULE_LICENSE("GPL");
292 MODULE_DESCRIPTION("Crypto Algorithm Manager");