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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
6fe4a28d 13#include <crypto/internal/aead.h>
39871037 14#include <linux/completion.h>
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15#include <linux/ctype.h>
16#include <linux/err.h>
17#include <linux/init.h>
cf02f5da 18#include <linux/kthread.h>
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19#include <linux/module.h>
20#include <linux/notifier.h>
21#include <linux/rtnetlink.h>
6bfd4809 22#include <linux/sched.h>
5a0e3ad6 23#include <linux/slab.h>
2b8c19db 24#include <linux/string.h>
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25
26#include "internal.h"
27
28struct cryptomgr_param {
39e1ee01 29 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
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30
31 struct {
32 struct rtattr attr;
33 struct crypto_attr_type data;
34 } type;
35
39e1ee01 36 union {
2b8c19db 37 struct rtattr attr;
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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
2b8c19db 48 char template[CRYPTO_MAX_ALG_NAME];
73d3864a 49
939e1779 50 struct crypto_larval *larval;
39871037 51
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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;
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60};
61
cf02f5da 62static int cryptomgr_probe(void *data)
2b8c19db 63{
cf02f5da 64 struct cryptomgr_param *param = data;
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65 struct crypto_template *tmpl;
66 struct crypto_instance *inst;
6bfd4809 67 int err;
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68
69 tmpl = crypto_lookup_template(param->template);
70 if (!tmpl)
39871037 71 goto out;
2b8c19db 72
6bfd4809 73 do {
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74 if (tmpl->create) {
75 err = tmpl->create(tmpl, param->tb);
76 continue;
77 }
78
ebc610e5 79 inst = tmpl->alloc(param->tb);
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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));
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85
86 crypto_tmpl_put(tmpl);
87
88out:
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89 complete_all(&param->larval->completion);
90 crypto_alg_put(&param->larval->alg);
2b8c19db 91 kfree(param);
cf02f5da 92 module_put_and_exit(0);
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93}
94
95static int cryptomgr_schedule_probe(struct crypto_larval *larval)
96{
1605b847 97 struct task_struct *thread;
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98 struct cryptomgr_param *param;
99 const char *name = larval->alg.cra_name;
100 const char *p;
101 unsigned int len;
39e1ee01 102 int i;
2b8c19db 103
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104 if (!try_module_get(THIS_MODULE))
105 goto err;
106
ebc610e5 107 param = kzalloc(sizeof(*param), GFP_KERNEL);
2b8c19db 108 if (!param)
cf02f5da 109 goto err_put_module;
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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);
2b8c19db 119
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120 i = 0;
121 for (;;) {
122 int notnum = 0;
2b8c19db 123
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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;
720a650f 143 p++;
39e1ee01 144 }
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145
146 len = p - name;
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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] = &param->attrs[i].attr;
164 i++;
165
720a650f 166 if (i >= CRYPTO_MAX_ATTRS)
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167 goto err_free_param;
168
169 if (*p == ')')
170 break;
171
172 if (*p != ',')
173 goto err_free_param;
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174 }
175
39e1ee01 176 if (!i)
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177 goto err_free_param;
178
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179 param->tb[i + 1] = NULL;
180
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181 param->type.attr.rta_len = sizeof(param->type);
182 param->type.attr.rta_type = CRYPTOA_TYPE;
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183 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
184 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
39e1ee01 185 param->tb[0] = &param->type.attr;
2b8c19db 186
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187 param->otype = larval->alg.cra_flags;
188 param->omask = larval->mask;
189
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190 crypto_alg_get(&larval->alg);
191 param->larval = larval;
39871037 192
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193 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
194 if (IS_ERR(thread))
939e1779 195 goto err_put_larval;
73d3864a 196
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197 wait_for_completion_interruptible(&larval->completion);
198
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199 return NOTIFY_STOP;
200
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201err_put_larval:
202 crypto_alg_put(&larval->alg);
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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
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217#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
218 goto skiptest;
219#endif
220
6fe4a28d 221 if (type & CRYPTO_ALG_TESTED)
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222 goto skiptest;
223
1aa4ecd9 224 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
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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;
6fe4a28d 237 u32 type;
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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));
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248 type = alg->cra_flags;
249
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250 /* Do not test internal algorithms. */
251 if (type & CRYPTO_ALG_INTERNAL)
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252 type |= CRYPTO_ALG_TESTED;
253
254 param->type = type;
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255
256 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
1605b847 257 if (IS_ERR(thread))
cf02f5da 258 goto err_free_param;
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259
260 return NOTIFY_STOP;
261
262err_free_param:
263 kfree(param);
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264err_put_module:
265 module_put(THIS_MODULE);
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266err:
267 return NOTIFY_OK;
268}
269
270static 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);
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276 case CRYPTO_MSG_ALG_REGISTER:
277 return cryptomgr_schedule_test(data);
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278 }
279
280 return NOTIFY_DONE;
281}
282
283static struct notifier_block cryptomgr_notifier = {
284 .notifier_call = cryptomgr_notify,
285};
286
287static int __init cryptomgr_init(void)
288{
f8b0d4d0 289 return crypto_register_notifier(&cryptomgr_notifier);
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290}
291
292static void __exit cryptomgr_exit(void)
293{
294 int err = crypto_unregister_notifier(&cryptomgr_notifier);
295 BUG_ON(err);
296}
297
da7f033d 298subsys_initcall(cryptomgr_init);
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299module_exit(cryptomgr_exit);
300
301MODULE_LICENSE("GPL");
302MODULE_DESCRIPTION("Crypto Algorithm Manager");