]>
Commit | Line | Data |
---|---|---|
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 | 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 | ||
201 | err_put_larval: | |
202 | crypto_alg_put(&larval->alg); | |
203 | err_free_param: | |
204 | kfree(param); | |
205 | err_put_module: | |
206 | module_put(THIS_MODULE); | |
207 | err: | |
208 | return NOTIFY_OK; | |
209 | } | |
210 | ||
211 | static 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 | ||
226 | skiptest: | |
227 | crypto_alg_tested(param->driver, err); | |
228 | ||
229 | kfree(param); | |
230 | module_put_and_exit(0); | |
231 | } | |
232 | ||
233 | static 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 | /* Do not test internal algorithms. */ | |
251 | if (type & CRYPTO_ALG_INTERNAL) | |
252 | type |= CRYPTO_ALG_TESTED; | |
253 | ||
254 | param->type = type; | |
255 | ||
256 | thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); | |
257 | if (IS_ERR(thread)) | |
258 | goto err_free_param; | |
259 | ||
260 | return NOTIFY_STOP; | |
261 | ||
262 | err_free_param: | |
263 | kfree(param); | |
264 | err_put_module: | |
265 | module_put(THIS_MODULE); | |
266 | err: | |
267 | return NOTIFY_OK; | |
268 | } | |
269 | ||
270 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
271 | void *data) | |
272 | { | |
273 | switch (msg) { | |
274 | case CRYPTO_MSG_ALG_REQUEST: | |
275 | return cryptomgr_schedule_probe(data); | |
276 | case CRYPTO_MSG_ALG_REGISTER: | |
277 | return cryptomgr_schedule_test(data); | |
278 | } | |
279 | ||
280 | return NOTIFY_DONE; | |
281 | } | |
282 | ||
283 | static struct notifier_block cryptomgr_notifier = { | |
284 | .notifier_call = cryptomgr_notify, | |
285 | }; | |
286 | ||
287 | static int __init cryptomgr_init(void) | |
288 | { | |
289 | return crypto_register_notifier(&cryptomgr_notifier); | |
290 | } | |
291 | ||
292 | static void __exit cryptomgr_exit(void) | |
293 | { | |
294 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
295 | BUG_ON(err); | |
296 | } | |
297 | ||
298 | subsys_initcall(cryptomgr_init); | |
299 | module_exit(cryptomgr_exit); | |
300 | ||
301 | MODULE_LICENSE("GPL"); | |
302 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |