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");