1/*
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 <crypto/internal/aead.h>
14#include <linux/completion.h>
15#include <linux/ctype.h>
16#include <linux/err.h>
17#include <linux/init.h>
18#include <linux/kthread.h>
19#include <linux/module.h>
20#include <linux/notifier.h>
21#include <linux/rtnetlink.h>
22#include <linux/sched/signal.h>
23#include <linux/slab.h>
24#include <linux/string.h>
25
26#include "internal.h"
27
28struct cryptomgr_param {
29 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
30
31 struct {
32 struct rtattr attr;
33 struct crypto_attr_type data;
34 } type;
35
36 union {
37 struct rtattr attr;
38 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];
47
48 char template[CRYPTO_MAX_ALG_NAME];
49
50 struct crypto_larval *larval;
51
52 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;
60};
61
62static int cryptomgr_probe(void *data)
63{
64 struct cryptomgr_param *param = data;
65 struct crypto_template *tmpl;
66 struct crypto_instance *inst;
67 int err;
68
69 tmpl = crypto_lookup_template(param->template);
70 if (!tmpl)
71 goto out;
72
73 do {
74 if (tmpl->create) {
75 err = tmpl->create(tmpl, param->tb);
76 continue;
77 }
78
79 inst = tmpl->alloc(param->tb);
80 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));
85
86 crypto_tmpl_put(tmpl);
87
88out:
89 complete_all(&param->larval->completion);
90 crypto_alg_put(&param->larval->alg);
91 kfree(param);
92 module_put_and_exit(0);
93}
94
95static int cryptomgr_schedule_probe(struct crypto_larval *larval)
96{
97 struct task_struct *thread;
98 struct cryptomgr_param *param;
99 const char *name = larval->alg.cra_name;
100 const char *p;
101 unsigned int len;
102 int i;
103
104 if (!try_module_get(THIS_MODULE))
105 goto err;
106
107 param = kzalloc(sizeof(*param), GFP_KERNEL);
108 if (!param)
109 goto err_put_module;
110
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);
119
120 i = 0;
121 for (;;) {
122 int notnum = 0;
123
124 name = ++p;
125
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;
142 p++;
143 }
144
145 len = p - name;
146 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
165 if (i >= CRYPTO_MAX_ATTRS)
166 goto err_free_param;
167
168 if (*p == ')')
169 break;
170
171 if (*p != ',')
172 goto err_free_param;
173 }
174
175 if (!i)
176 goto err_free_param;
177
178 param->tb[i + 1] = NULL;
179
180 param->type.attr.rta_len = sizeof(param->type);
181 param->type.attr.rta_type = CRYPTOA_TYPE;
182 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
183 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
184 param->tb[0] = &param->type.attr;
185
186 param->otype = larval->alg.cra_flags;
187 param->omask = larval->mask;
188
189 crypto_alg_get(&larval->alg);
190 param->larval = larval;
191
192 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
193 if (IS_ERR(thread))
194 goto err_put_larval;
195
196 wait_for_completion_interruptible(&larval->completion);
197
198 return NOTIFY_STOP;
199
200err_put_larval:
201 crypto_alg_put(&larval->alg);
202err_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
216#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
217 goto skiptest;
218#endif
219
220 if (type & CRYPTO_ALG_TESTED)
221 goto skiptest;
222
223 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
224
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;
236 u32 type;
237
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));
247 type = alg->cra_flags;
248
249 /* Do not test internal algorithms. */
250 if (type & CRYPTO_ALG_INTERNAL)
251 type |= CRYPTO_ALG_TESTED;
252
253 param->type = type;
254
255 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
256 if (IS_ERR(thread))
257 goto err_free_param;
258
259 return NOTIFY_STOP;
260
261err_free_param:
262 kfree(param);
263err_put_module:
264 module_put(THIS_MODULE);
265err:
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);
275 case CRYPTO_MSG_ALG_REGISTER:
276 return cryptomgr_schedule_test(data);
277 case CRYPTO_MSG_ALG_LOADED:
278 break;
279 }
280
281 return NOTIFY_DONE;
282}
283
284static struct notifier_block cryptomgr_notifier = {
285 .notifier_call = cryptomgr_notify,
286};
287
288static int __init cryptomgr_init(void)
289{
290 return crypto_register_notifier(&cryptomgr_notifier);
291}
292
293static void __exit cryptomgr_exit(void)
294{
295 int err = crypto_unregister_notifier(&cryptomgr_notifier);
296 BUG_ON(err);
297}
298
299subsys_initcall(cryptomgr_init);
300module_exit(cryptomgr_exit);
301
302MODULE_LICENSE("GPL");
303MODULE_DESCRIPTION("Crypto Algorithm Manager");
304