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/string.h>
  23
  24 #include "internal.h"
  25
  26 struct cryptomgr_param {
  27         struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
  28
  29         struct {
  30                 struct rtattr attr;
  31                 struct crypto_attr_type data;
  32         } type;
  33
  34         union {
  35                 struct rtattr attr;
  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];
  47         char template[CRYPTO_MAX_ALG_NAME];
  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;
  57 };
  58
  59 static int cryptomgr_probe(void *data)
  60 {
  61         struct cryptomgr_param *param = data;
  62         struct crypto_template *tmpl;
  63         struct crypto_instance *inst;
  64         int err;
  65
  66         tmpl = crypto_lookup_template(param->template);
  67         if (!tmpl)
  68                 goto err;
  69
  70         do {
  71                 inst = tmpl->alloc(param->tb);
  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));
  77
  78         crypto_tmpl_put(tmpl);
  79
  80         if (err)
  81                 goto err;
  82
  83 out:
  84         kfree(param);
  85         module_put_and_exit(0);
  86
  87 err:
  88         crypto_larval_error(param->larval, param->otype, param->omask);
  89         goto out;
  90 }
  91
  92 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
  93 {
  94         struct task_struct *thread;
  95         struct cryptomgr_param *param;
  96         const char *name = larval->alg.cra_name;
  97         const char *p;
  98         unsigned int len;
  99         int i;
 100
 101         if (!try_module_get(THIS_MODULE))
 102                 goto err;
 103
 104         param = kzalloc(sizeof(*param), GFP_KERNEL);
 105         if (!param)
 106                 goto err_put_module;
 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);
 116
 117         i = 0;
 118         for (;;) {
 119                 int notnum = 0;
 120
 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;
 140                         p++;
 141                 }
 142
 143                 len = p - name;
 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] = &param->attrs[i].attr;
 161                 i++;
 162
 163                 if (i >= CRYPTO_MAX_ATTRS)
 164                         goto err_free_param;
 165
 166                 if (*p == ')')
 167                         break;
 168
 169                 if (*p != ',')
 170                         goto err_free_param;
 171         }
 172
 173         if (!i)
 174                 goto err_free_param;
 175
 176         param->tb[i + 1] = NULL;
 177
 178         param->type.attr.rta_len = sizeof(param->type);
 179         param->type.attr.rta_type = CRYPTOA_TYPE;
 180         param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
 181         param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
 182         param->tb[0] = &param->type.attr;
 183
 184         param->otype = larval->alg.cra_flags;
 185         param->omask = larval->mask;
 186
 187         memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
 188
 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
 209         if (type & CRYPTO_ALG_TESTED)
 210                 goto skiptest;
 211
 212         err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
 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;
 225         u32 type;
 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));
 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;
 249
 250         thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
 251         if (IS_ERR(thread))
 252                 goto err_free_param;
 253
 254         return NOTIFY_STOP;
 255
 256 err_free_param:
 257         kfree(param);
 258 err_put_module:
 259         module_put(THIS_MODULE);
 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);
 270         case CRYPTO_MSG_ALG_REGISTER:
 271                 return cryptomgr_schedule_test(data);
 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 {
 283         return crypto_register_notifier(&cryptomgr_notifier);
 284 }
 285
 286 static void __exit cryptomgr_exit(void)
 287 {
 288         int err = crypto_unregister_notifier(&cryptomgr_notifier);
 289         BUG_ON(err);
 290 }
 291
 292 subsys_initcall(cryptomgr_init);
 293 module_exit(cryptomgr_exit);
 294
 295 MODULE_LICENSE("GPL");
 296 MODULE_DESCRIPTION("Crypto Algorithm Manager");