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2b8c19db HX |
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 | ||
6fe4a28d | 13 | #include <crypto/internal/aead.h> |
2b8c19db HX |
14 | #include <linux/ctype.h> |
15 | #include <linux/err.h> | |
16 | #include <linux/init.h> | |
cf02f5da | 17 | #include <linux/kthread.h> |
2b8c19db HX |
18 | #include <linux/module.h> |
19 | #include <linux/notifier.h> | |
20 | #include <linux/rtnetlink.h> | |
6bfd4809 | 21 | #include <linux/sched.h> |
2b8c19db | 22 | #include <linux/string.h> |
2b8c19db HX |
23 | |
24 | #include "internal.h" | |
25 | ||
26 | struct cryptomgr_param { | |
39e1ee01 | 27 | struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; |
ebc610e5 HX |
28 | |
29 | struct { | |
30 | struct rtattr attr; | |
31 | struct crypto_attr_type data; | |
32 | } type; | |
33 | ||
39e1ee01 | 34 | union { |
2b8c19db | 35 | struct rtattr attr; |
39e1ee01 HX |
36 | struct { |
37 | struct rtattr attr; | |
38 | struct crypto_attr_alg data; | |
39 | } alg; | |
40 | struct { | |
41 | struct rtattr attr; | |
42 | struct crypto_attr_u32 data; | |
43 | } nu32; | |
44 | } attrs[CRYPTO_MAX_ATTRS]; | |
45 | ||
46 | char larval[CRYPTO_MAX_ALG_NAME]; | |
2b8c19db | 47 | char template[CRYPTO_MAX_ALG_NAME]; |
73d3864a HX |
48 | |
49 | u32 otype; | |
50 | u32 omask; | |
51 | }; | |
52 | ||
53 | struct crypto_test_param { | |
54 | char driver[CRYPTO_MAX_ALG_NAME]; | |
55 | char alg[CRYPTO_MAX_ALG_NAME]; | |
56 | u32 type; | |
2b8c19db HX |
57 | }; |
58 | ||
cf02f5da | 59 | static int cryptomgr_probe(void *data) |
2b8c19db | 60 | { |
cf02f5da | 61 | struct cryptomgr_param *param = data; |
2b8c19db HX |
62 | struct crypto_template *tmpl; |
63 | struct crypto_instance *inst; | |
6bfd4809 | 64 | int err; |
2b8c19db HX |
65 | |
66 | tmpl = crypto_lookup_template(param->template); | |
67 | if (!tmpl) | |
68 | goto err; | |
69 | ||
6bfd4809 | 70 | do { |
ebc610e5 | 71 | inst = tmpl->alloc(param->tb); |
6bfd4809 HX |
72 | if (IS_ERR(inst)) |
73 | err = PTR_ERR(inst); | |
74 | else if ((err = crypto_register_instance(tmpl, inst))) | |
75 | tmpl->free(inst); | |
76 | } while (err == -EAGAIN && !signal_pending(current)); | |
2b8c19db HX |
77 | |
78 | crypto_tmpl_put(tmpl); | |
79 | ||
6bfd4809 HX |
80 | if (err) |
81 | goto err; | |
82 | ||
2b8c19db HX |
83 | out: |
84 | kfree(param); | |
cf02f5da | 85 | module_put_and_exit(0); |
2b8c19db HX |
86 | |
87 | err: | |
73d3864a | 88 | crypto_larval_error(param->larval, param->otype, param->omask); |
2b8c19db HX |
89 | goto out; |
90 | } | |
91 | ||
92 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) | |
93 | { | |
1605b847 | 94 | struct task_struct *thread; |
2b8c19db HX |
95 | struct cryptomgr_param *param; |
96 | const char *name = larval->alg.cra_name; | |
97 | const char *p; | |
98 | unsigned int len; | |
39e1ee01 | 99 | int i; |
2b8c19db | 100 | |
cf02f5da HX |
101 | if (!try_module_get(THIS_MODULE)) |
102 | goto err; | |
103 | ||
ebc610e5 | 104 | param = kzalloc(sizeof(*param), GFP_KERNEL); |
2b8c19db | 105 | if (!param) |
cf02f5da | 106 | goto err_put_module; |
2b8c19db HX |
107 | |
108 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
109 | ; | |
110 | ||
111 | len = p - name; | |
112 | if (!len || *p != '(') | |
113 | goto err_free_param; | |
114 | ||
115 | memcpy(param->template, name, len); | |
2b8c19db | 116 | |
39e1ee01 HX |
117 | i = 0; |
118 | for (;;) { | |
119 | int notnum = 0; | |
2b8c19db | 120 | |
39e1ee01 HX |
121 | name = ++p; |
122 | len = 0; | |
123 | ||
124 | for (; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
125 | notnum |= !isdigit(*p); | |
126 | ||
127 | if (*p == '(') { | |
128 | int recursion = 0; | |
129 | ||
130 | for (;;) { | |
131 | if (!*++p) | |
132 | goto err_free_param; | |
133 | if (*p == '(') | |
134 | recursion++; | |
135 | else if (*p == ')' && !recursion--) | |
136 | break; | |
137 | } | |
138 | ||
139 | notnum = 1; | |
720a650f | 140 | p++; |
39e1ee01 | 141 | } |
cf02f5da HX |
142 | |
143 | len = p - name; | |
39e1ee01 HX |
144 | if (!len) |
145 | goto err_free_param; | |
146 | ||
147 | if (notnum) { | |
148 | param->attrs[i].alg.attr.rta_len = | |
149 | sizeof(param->attrs[i].alg); | |
150 | param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; | |
151 | memcpy(param->attrs[i].alg.data.name, name, len); | |
152 | } else { | |
153 | param->attrs[i].nu32.attr.rta_len = | |
154 | sizeof(param->attrs[i].nu32); | |
155 | param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; | |
156 | param->attrs[i].nu32.data.num = | |
157 | simple_strtol(name, NULL, 0); | |
158 | } | |
159 | ||
160 | param->tb[i + 1] = ¶m->attrs[i].attr; | |
161 | i++; | |
162 | ||
720a650f | 163 | if (i >= CRYPTO_MAX_ATTRS) |
39e1ee01 HX |
164 | goto err_free_param; |
165 | ||
166 | if (*p == ')') | |
167 | break; | |
168 | ||
169 | if (*p != ',') | |
170 | goto err_free_param; | |
cf02f5da HX |
171 | } |
172 | ||
39e1ee01 | 173 | if (!i) |
2b8c19db HX |
174 | goto err_free_param; |
175 | ||
39e1ee01 HX |
176 | param->tb[i + 1] = NULL; |
177 | ||
ebc610e5 HX |
178 | param->type.attr.rta_len = sizeof(param->type); |
179 | param->type.attr.rta_type = CRYPTOA_TYPE; | |
73d3864a HX |
180 | param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; |
181 | param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; | |
39e1ee01 | 182 | param->tb[0] = ¶m->type.attr; |
2b8c19db | 183 | |
73d3864a HX |
184 | param->otype = larval->alg.cra_flags; |
185 | param->omask = larval->mask; | |
186 | ||
39e1ee01 | 187 | memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); |
2b8c19db | 188 | |
73d3864a HX |
189 | thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); |
190 | if (IS_ERR(thread)) | |
191 | goto err_free_param; | |
192 | ||
193 | return NOTIFY_STOP; | |
194 | ||
195 | err_free_param: | |
196 | kfree(param); | |
197 | err_put_module: | |
198 | module_put(THIS_MODULE); | |
199 | err: | |
200 | return NOTIFY_OK; | |
201 | } | |
202 | ||
203 | static int cryptomgr_test(void *data) | |
204 | { | |
205 | struct crypto_test_param *param = data; | |
206 | u32 type = param->type; | |
207 | int err = 0; | |
208 | ||
6fe4a28d | 209 | if (type & CRYPTO_ALG_TESTED) |
73d3864a HX |
210 | goto skiptest; |
211 | ||
1aa4ecd9 | 212 | err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); |
73d3864a HX |
213 | |
214 | skiptest: | |
215 | crypto_alg_tested(param->driver, err); | |
216 | ||
217 | kfree(param); | |
218 | module_put_and_exit(0); | |
219 | } | |
220 | ||
221 | static int cryptomgr_schedule_test(struct crypto_alg *alg) | |
222 | { | |
223 | struct task_struct *thread; | |
224 | struct crypto_test_param *param; | |
6fe4a28d | 225 | u32 type; |
73d3864a HX |
226 | |
227 | if (!try_module_get(THIS_MODULE)) | |
228 | goto err; | |
229 | ||
230 | param = kzalloc(sizeof(*param), GFP_KERNEL); | |
231 | if (!param) | |
232 | goto err_put_module; | |
233 | ||
234 | memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); | |
235 | memcpy(param->alg, alg->cra_name, sizeof(param->alg)); | |
6fe4a28d HX |
236 | type = alg->cra_flags; |
237 | ||
238 | /* This piece of crap needs to disappear into per-type test hooks. */ | |
239 | if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & | |
240 | CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) && | |
241 | ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
242 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
243 | alg->cra_ablkcipher.ivsize)) || | |
244 | (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) && | |
245 | alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize)) | |
246 | type |= CRYPTO_ALG_TESTED; | |
247 | ||
248 | param->type = type; | |
73d3864a HX |
249 | |
250 | thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); | |
1605b847 | 251 | if (IS_ERR(thread)) |
cf02f5da | 252 | goto err_free_param; |
2b8c19db HX |
253 | |
254 | return NOTIFY_STOP; | |
255 | ||
256 | err_free_param: | |
257 | kfree(param); | |
cf02f5da HX |
258 | err_put_module: |
259 | module_put(THIS_MODULE); | |
2b8c19db HX |
260 | err: |
261 | return NOTIFY_OK; | |
262 | } | |
263 | ||
264 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
265 | void *data) | |
266 | { | |
267 | switch (msg) { | |
268 | case CRYPTO_MSG_ALG_REQUEST: | |
269 | return cryptomgr_schedule_probe(data); | |
73d3864a HX |
270 | case CRYPTO_MSG_ALG_REGISTER: |
271 | return cryptomgr_schedule_test(data); | |
2b8c19db HX |
272 | } |
273 | ||
274 | return NOTIFY_DONE; | |
275 | } | |
276 | ||
277 | static struct notifier_block cryptomgr_notifier = { | |
278 | .notifier_call = cryptomgr_notify, | |
279 | }; | |
280 | ||
281 | static int __init cryptomgr_init(void) | |
282 | { | |
f8b0d4d0 | 283 | return crypto_register_notifier(&cryptomgr_notifier); |
2b8c19db HX |
284 | } |
285 | ||
286 | static void __exit cryptomgr_exit(void) | |
287 | { | |
288 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
289 | BUG_ON(err); | |
290 | } | |
291 | ||
da7f033d | 292 | subsys_initcall(cryptomgr_init); |
2b8c19db HX |
293 | module_exit(cryptomgr_exit); |
294 | ||
295 | MODULE_LICENSE("GPL"); | |
296 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |