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Linux/crypto/algboss.c

  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.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(&param->larval->completion);
 90         crypto_alg_put(&param->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] = &param->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] = &param->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");
303 

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