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/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] = &param->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] = &param->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         if (type & CRYPTO_ALG_TESTED)
 216                 goto skiptest;
 217
 218         err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
 219
 220 skiptest:
 221         crypto_alg_tested(param->driver, err);
 222
 223         kfree(param);
 224         module_put_and_exit(0);
 225 }
 226
 227 static int cryptomgr_schedule_test(struct crypto_alg *alg)
 228 {
 229         struct task_struct *thread;
 230         struct crypto_test_param *param;
 231         u32 type;
 232
 233         if (!try_module_get(THIS_MODULE))
 234                 goto err;
 235
 236         param = kzalloc(sizeof(*param), GFP_KERNEL);
 237         if (!param)
 238                 goto err_put_module;
 239
 240         memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
 241         memcpy(param->alg, alg->cra_name, sizeof(param->alg));
 242         type = alg->cra_flags;
 243
 244         /* This piece of crap needs to disappear into per-type test hooks. */
 245         if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
 246                CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
 247              ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 248               CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
 249                                           alg->cra_ablkcipher.ivsize)) ||
 250             (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
 251              alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
 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");