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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.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(¶m->larval->completion);
90 crypto_alg_put(¶m->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 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;
143 p++;
144 }
145
146 len = p - name;
147 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] = ¶m->attrs[i].attr;
164 i++;
165
166 if (i >= CRYPTO_MAX_ATTRS)
167 goto err_free_param;
168
169 if (*p == ')')
170 break;
171
172 if (*p != ',')
173 goto err_free_param;
174 }
175
176 if (!i)
177 goto err_free_param;
178
179 param->tb[i + 1] = NULL;
180
181 param->type.attr.rta_len = sizeof(param->type);
182 param->type.attr.rta_type = CRYPTOA_TYPE;
183 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
184 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
185 param->tb[0] = ¶m->type.attr;
186
187 param->otype = larval->alg.cra_flags;
188 param->omask = larval->mask;
189
190 crypto_alg_get(&larval->alg);
191 param->larval = larval;
192
193 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
194 if (IS_ERR(thread))
195 goto err_put_larval;
196
197 wait_for_completion_interruptible(&larval->completion);
198
199 return NOTIFY_STOP;
200
201err_put_larval:
202 crypto_alg_put(&larval->alg);
203err_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
217#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
218 goto skiptest;
219#endif
220
221 if (type & CRYPTO_ALG_TESTED)
222 goto skiptest;
223
224 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
225
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;
237 u32 type;
238
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));
248 type = alg->cra_flags;
249
250
251 if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
252 CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
253 ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
254 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
255 alg->cra_ablkcipher.ivsize)) ||
256 (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
257 alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
258 type |= CRYPTO_ALG_TESTED;
259
260 param->type = type;
261
262 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
263 if (IS_ERR(thread))
264 goto err_free_param;
265
266 return NOTIFY_STOP;
267
268err_free_param:
269 kfree(param);
270err_put_module:
271 module_put(THIS_MODULE);
272err:
273 return NOTIFY_OK;
274}
275
276static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
277 void *data)
278{
279 switch (msg) {
280 case CRYPTO_MSG_ALG_REQUEST:
281 return cryptomgr_schedule_probe(data);
282 case CRYPTO_MSG_ALG_REGISTER:
283 return cryptomgr_schedule_test(data);
284 }
285
286 return NOTIFY_DONE;
287}
288
289static struct notifier_block cryptomgr_notifier = {
290 .notifier_call = cryptomgr_notify,
291};
292
293static int __init cryptomgr_init(void)
294{
295 return crypto_register_notifier(&cryptomgr_notifier);
296}
297
298static void __exit cryptomgr_exit(void)
299{
300 int err = crypto_unregister_notifier(&cryptomgr_notifier);
301 BUG_ON(err);
302}
303
304subsys_initcall(cryptomgr_init);
305module_exit(cryptomgr_exit);
306
307MODULE_LICENSE("GPL");
308MODULE_DESCRIPTION("Crypto Algorithm Manager");
309
