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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/ctype.h> |
15 | #include <linux/err.h> |
16 | #include <linux/init.h> |
17 | #include <linux/kthread.h> |
18 | #include <linux/module.h> |
19 | #include <linux/notifier.h> |
20 | #include <linux/rtnetlink.h> |
21 | #include <linux/sched.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/string.h> |
24 | |
25 | #include "internal.h" |
26 | |
27 | struct cryptomgr_param { |
28 | struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; |
29 | |
30 | struct { |
31 | struct rtattr attr; |
32 | struct crypto_attr_type data; |
33 | } type; |
34 | |
35 | union { |
36 | struct rtattr attr; |
37 | struct { |
38 | struct rtattr attr; |
39 | struct crypto_attr_alg data; |
40 | } alg; |
41 | struct { |
42 | struct rtattr attr; |
43 | struct crypto_attr_u32 data; |
44 | } nu32; |
45 | } attrs[CRYPTO_MAX_ATTRS]; |
46 | |
47 | char larval[CRYPTO_MAX_ALG_NAME]; |
48 | char template[CRYPTO_MAX_ALG_NAME]; |
49 | |
50 | u32 otype; |
51 | u32 omask; |
52 | }; |
53 | |
54 | struct crypto_test_param { |
55 | char driver[CRYPTO_MAX_ALG_NAME]; |
56 | char alg[CRYPTO_MAX_ALG_NAME]; |
57 | u32 type; |
58 | }; |
59 | |
60 | static int cryptomgr_probe(void *data) |
61 | { |
62 | struct cryptomgr_param *param = data; |
63 | struct crypto_template *tmpl; |
64 | struct crypto_instance *inst; |
65 | int err; |
66 | |
67 | tmpl = crypto_lookup_template(param->template); |
68 | if (!tmpl) |
69 | goto err; |
70 | |
71 | do { |
72 | if (tmpl->create) { |
73 | err = tmpl->create(tmpl, param->tb); |
74 | continue; |
75 | } |
76 | |
77 | inst = tmpl->alloc(param->tb); |
78 | if (IS_ERR(inst)) |
79 | err = PTR_ERR(inst); |
80 | else if ((err = crypto_register_instance(tmpl, inst))) |
81 | tmpl->free(inst); |
82 | } while (err == -EAGAIN && !signal_pending(current)); |
83 | |
84 | crypto_tmpl_put(tmpl); |
85 | |
86 | if (err) |
87 | goto err; |
88 | |
89 | out: |
90 | kfree(param); |
91 | module_put_and_exit(0); |
92 | |
93 | err: |
94 | crypto_larval_error(param->larval, param->otype, param->omask); |
95 | goto out; |
96 | } |
97 | |
98 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) |
99 | { |
100 | struct task_struct *thread; |
101 | struct cryptomgr_param *param; |
102 | const char *name = larval->alg.cra_name; |
103 | const char *p; |
104 | unsigned int len; |
105 | int i; |
106 | |
107 | if (!try_module_get(THIS_MODULE)) |
108 | goto err; |
109 | |
110 | param = kzalloc(sizeof(*param), GFP_KERNEL); |
111 | if (!param) |
112 | goto err_put_module; |
113 | |
114 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) |
115 | ; |
116 | |
117 | len = p - name; |
118 | if (!len || *p != '(') |
119 | goto err_free_param; |
120 | |
121 | memcpy(param->template, name, len); |
122 | |
123 | i = 0; |
124 | for (;;) { |
125 | int notnum = 0; |
126 | |
127 | name = ++p; |
128 | len = 0; |
129 | |
130 | for (; isalnum(*p) || *p == '-' || *p == '_'; p++) |
131 | notnum |= !isdigit(*p); |
132 | |
133 | if (*p == '(') { |
134 | int recursion = 0; |
135 | |
136 | for (;;) { |
137 | if (!*++p) |
138 | goto err_free_param; |
139 | if (*p == '(') |
140 | recursion++; |
141 | else if (*p == ')' && !recursion--) |
142 | break; |
143 | } |
144 | |
145 | notnum = 1; |
146 | p++; |
147 | } |
148 | |
149 | len = p - name; |
150 | if (!len) |
151 | goto err_free_param; |
152 | |
153 | if (notnum) { |
154 | param->attrs[i].alg.attr.rta_len = |
155 | sizeof(param->attrs[i].alg); |
156 | param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; |
157 | memcpy(param->attrs[i].alg.data.name, name, len); |
158 | } else { |
159 | param->attrs[i].nu32.attr.rta_len = |
160 | sizeof(param->attrs[i].nu32); |
161 | param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; |
162 | param->attrs[i].nu32.data.num = |
163 | simple_strtol(name, NULL, 0); |
164 | } |
165 | |
166 | param->tb[i + 1] = ¶m->attrs[i].attr; |
167 | i++; |
168 | |
169 | if (i >= CRYPTO_MAX_ATTRS) |
170 | goto err_free_param; |
171 | |
172 | if (*p == ')') |
173 | break; |
174 | |
175 | if (*p != ',') |
176 | goto err_free_param; |
177 | } |
178 | |
179 | if (!i) |
180 | goto err_free_param; |
181 | |
182 | param->tb[i + 1] = NULL; |
183 | |
184 | param->type.attr.rta_len = sizeof(param->type); |
185 | param->type.attr.rta_type = CRYPTOA_TYPE; |
186 | param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; |
187 | param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; |
188 | param->tb[0] = ¶m->type.attr; |
189 | |
190 | param->otype = larval->alg.cra_flags; |
191 | param->omask = larval->mask; |
192 | |
193 | memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); |
194 | |
195 | thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); |
196 | if (IS_ERR(thread)) |
197 | goto err_free_param; |
198 | |
199 | return NOTIFY_STOP; |
200 | |
201 | err_free_param: |
202 | kfree(param); |
203 | err_put_module: |
204 | module_put(THIS_MODULE); |
205 | err: |
206 | return NOTIFY_OK; |
207 | } |
208 | |
209 | static int cryptomgr_test(void *data) |
210 | { |
211 | struct crypto_test_param *param = data; |
212 | u32 type = param->type; |
213 | int err = 0; |
214 | |
215 | #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS |
216 | goto skiptest; |
217 | #endif |
218 | |
219 | if (type & CRYPTO_ALG_TESTED) |
220 | goto skiptest; |
221 | |
222 | err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); |
223 | |
224 | skiptest: |
225 | crypto_alg_tested(param->driver, err); |
226 | |
227 | kfree(param); |
228 | module_put_and_exit(0); |
229 | } |
230 | |
231 | static int cryptomgr_schedule_test(struct crypto_alg *alg) |
232 | { |
233 | struct task_struct *thread; |
234 | struct crypto_test_param *param; |
235 | u32 type; |
236 | |
237 | if (!try_module_get(THIS_MODULE)) |
238 | goto err; |
239 | |
240 | param = kzalloc(sizeof(*param), GFP_KERNEL); |
241 | if (!param) |
242 | goto err_put_module; |
243 | |
244 | memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); |
245 | memcpy(param->alg, alg->cra_name, sizeof(param->alg)); |
246 | type = alg->cra_flags; |
247 | |
248 | /* This piece of crap needs to disappear into per-type test hooks. */ |
249 | if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & |
250 | CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) && |
251 | ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
252 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
253 | alg->cra_ablkcipher.ivsize)) || |
254 | (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) && |
255 | alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize)) |
256 | type |= CRYPTO_ALG_TESTED; |
257 | |
258 | param->type = type; |
259 | |
260 | thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); |
261 | if (IS_ERR(thread)) |
262 | goto err_free_param; |
263 | |
264 | return NOTIFY_STOP; |
265 | |
266 | err_free_param: |
267 | kfree(param); |
268 | err_put_module: |
269 | module_put(THIS_MODULE); |
270 | err: |
271 | return NOTIFY_OK; |
272 | } |
273 | |
274 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, |
275 | void *data) |
276 | { |
277 | switch (msg) { |
278 | case CRYPTO_MSG_ALG_REQUEST: |
279 | return cryptomgr_schedule_probe(data); |
280 | case CRYPTO_MSG_ALG_REGISTER: |
281 | return cryptomgr_schedule_test(data); |
282 | } |
283 | |
284 | return NOTIFY_DONE; |
285 | } |
286 | |
287 | static struct notifier_block cryptomgr_notifier = { |
288 | .notifier_call = cryptomgr_notify, |
289 | }; |
290 | |
291 | static int __init cryptomgr_init(void) |
292 | { |
293 | return crypto_register_notifier(&cryptomgr_notifier); |
294 | } |
295 | |
296 | static void __exit cryptomgr_exit(void) |
297 | { |
298 | int err = crypto_unregister_notifier(&cryptomgr_notifier); |
299 | BUG_ON(err); |
300 | } |
301 | |
302 | subsys_initcall(cryptomgr_init); |
303 | module_exit(cryptomgr_exit); |
304 | |
305 | MODULE_LICENSE("GPL"); |
306 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |
307 |
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