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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 | ||
28 | struct 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 | ||
56 | struct crypto_test_param { | |
57 | char driver[CRYPTO_MAX_ALG_NAME]; | |
58 | char alg[CRYPTO_MAX_ALG_NAME]; | |
59 | u32 type; | |
60 | }; | |
61 | ||
62 | static 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 | ||
88 | out: | |
89 | complete_all(¶m->larval->completion); | |
90 | crypto_alg_put(¶m->larval->alg); | |
91 | kfree(param); | |
92 | module_put_and_exit(0); | |
93 | } | |
94 | ||
95 | static 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] = ¶m->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] = ¶m->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 | ||
200 | err_put_larval: | |
201 | crypto_alg_put(&larval->alg); | |
202 | err_free_param: | |
203 | kfree(param); | |
204 | err_put_module: | |
205 | module_put(THIS_MODULE); | |
206 | err: | |
207 | return NOTIFY_OK; | |
208 | } | |
209 | ||
210 | static 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 | ||
225 | skiptest: | |
226 | crypto_alg_tested(param->driver, err); | |
227 | ||
228 | kfree(param); | |
229 | module_put_and_exit(0); | |
230 | } | |
231 | ||
232 | static 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 | ||
261 | err_free_param: | |
262 | kfree(param); | |
263 | err_put_module: | |
264 | module_put(THIS_MODULE); | |
265 | err: | |
266 | return NOTIFY_OK; | |
267 | } | |
268 | ||
269 | static 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 | } | |
278 | ||
279 | return NOTIFY_DONE; | |
280 | } | |
281 | ||
282 | static struct notifier_block cryptomgr_notifier = { | |
283 | .notifier_call = cryptomgr_notify, | |
284 | }; | |
285 | ||
286 | static int __init cryptomgr_init(void) | |
287 | { | |
288 | return crypto_register_notifier(&cryptomgr_notifier); | |
289 | } | |
290 | ||
291 | static void __exit cryptomgr_exit(void) | |
292 | { | |
293 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
294 | BUG_ON(err); | |
295 | } | |
296 | ||
297 | subsys_initcall(cryptomgr_init); | |
298 | module_exit(cryptomgr_exit); | |
299 | ||
300 | MODULE_LICENSE("GPL"); | |
301 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |