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                 if (tmpl->create) {
  72                         err = tmpl->create(tmpl, param->tb);
  73                         continue;
  74                 }
  75
  76                 inst = tmpl->alloc(param->tb);
  77                 if (IS_ERR(inst))
  78                         err = PTR_ERR(inst);
  79                 else if ((err = crypto_register_instance(tmpl, inst)))
  80                         tmpl->free(inst);
  81         } while (err == -EAGAIN && !signal_pending(current));
  82
  83         crypto_tmpl_put(tmpl);
  84
  85         if (err)
  86                 goto err;
  87
  88 out:
  89         kfree(param);
  90         module_put_and_exit(0);
  91
  92 err:
  93         crypto_larval_error(param->larval, param->otype, param->omask);
  94         goto out;
  95 }
  96
  97 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
  98 {
  99         struct task_struct *thread;
 100         struct cryptomgr_param *param;
 101         const char *name = larval->alg.cra_name;
 102         const char *p;
 103         unsigned int len;
 104         int i;
 105
 106         if (!try_module_get(THIS_MODULE))
 107                 goto err;
 108
 109         param = kzalloc(sizeof(*param), GFP_KERNEL);
 110         if (!param)
 111                 goto err_put_module;
 112
 113         for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
 114                 ;
 115
 116         len = p - name;
 117         if (!len || *p != '(')
 118                 goto err_free_param;
 119
 120         memcpy(param->template, name, len);
 121
 122         i = 0;
 123         for (;;) {
 124                 int notnum = 0;
 125
 126                 name = ++p;
 127                 len = 0;
 128
 129                 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
 130                         notnum |= !isdigit(*p);
 131
 132                 if (*p == '(') {
 133                         int recursion = 0;
 134
 135                         for (;;) {
 136                                 if (!*++p)
 137                                         goto err_free_param;
 138                                 if (*p == '(')
 139                                         recursion++;
 140                                 else if (*p == ')' && !recursion--)
 141                                         break;
 142                         }
 143
 144                         notnum = 1;
 145                         p++;
 146                 }
 147
 148                 len = p - name;
 149                 if (!len)
 150                         goto err_free_param;
 151
 152                 if (notnum) {
 153                         param->attrs[i].alg.attr.rta_len =
 154                                 sizeof(param->attrs[i].alg);
 155                         param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
 156                         memcpy(param->attrs[i].alg.data.name, name, len);
 157                 } else {
 158                         param->attrs[i].nu32.attr.rta_len =
 159                                 sizeof(param->attrs[i].nu32);
 160                         param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
 161                         param->attrs[i].nu32.data.num =
 162                                 simple_strtol(name, NULL, 0);
 163                 }
 164
 165                 param->tb[i + 1] = &param->attrs[i].attr;
 166                 i++;
 167
 168                 if (i >= CRYPTO_MAX_ATTRS)
 169                         goto err_free_param;
 170
 171                 if (*p == ')')
 172                         break;
 173
 174                 if (*p != ',')
 175                         goto err_free_param;
 176         }
 177
 178         if (!i)
 179                 goto err_free_param;
 180
 181         param->tb[i + 1] = NULL;
 182
 183         param->type.attr.rta_len = sizeof(param->type);
 184         param->type.attr.rta_type = CRYPTOA_TYPE;
 185         param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
 186         param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
 187         param->tb[0] = &param->type.attr;
 188
 189         param->otype = larval->alg.cra_flags;
 190         param->omask = larval->mask;
 191
 192         memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
 193
 194         thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
 195         if (IS_ERR(thread))
 196                 goto err_free_param;
 197
 198         return NOTIFY_STOP;
 199
 200 err_free_param:
 201         kfree(param);
 202 err_put_module:
 203         module_put(THIS_MODULE);
 204 err:
 205         return NOTIFY_OK;
 206 }
 207
 208 static int cryptomgr_test(void *data)
 209 {
 210         struct crypto_test_param *param = data;
 211         u32 type = param->type;
 212         int err = 0;
 213
 214         if (type & CRYPTO_ALG_TESTED)
 215                 goto skiptest;
 216
 217         err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
 218
 219 skiptest:
 220         crypto_alg_tested(param->driver, err);
 221
 222         kfree(param);
 223         module_put_and_exit(0);
 224 }
 225
 226 static int cryptomgr_schedule_test(struct crypto_alg *alg)
 227 {
 228         struct task_struct *thread;
 229         struct crypto_test_param *param;
 230         u32 type;
 231
 232         if (!try_module_get(THIS_MODULE))
 233                 goto err;
 234
 235         param = kzalloc(sizeof(*param), GFP_KERNEL);
 236         if (!param)
 237                 goto err_put_module;
 238
 239         memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
 240         memcpy(param->alg, alg->cra_name, sizeof(param->alg));
 241         type = alg->cra_flags;
 242
 243         /* This piece of crap needs to disappear into per-type test hooks. */
 244         if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
 245                CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
 246              ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 247               CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
 248                                           alg->cra_ablkcipher.ivsize)) ||
 249             (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
 250              alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
 251                 type |= CRYPTO_ALG_TESTED;
 252
 253         param->type = type;
 254
 255         thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
 256         if (IS_ERR(thread))
 257                 goto err_free_param;
 258
 259         return NOTIFY_STOP;
 260
 261 err_free_param:
 262         kfree(param);
 263 err_put_module:
 264         module_put(THIS_MODULE);
 265 err:
 266         return NOTIFY_OK;
 267 }
 268
 269 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
 270                             void *data)
 271 {
 272         switch (msg) {
 273         case CRYPTO_MSG_ALG_REQUEST:
 274                 return cryptomgr_schedule_probe(data);
 275         case CRYPTO_MSG_ALG_REGISTER:
 276                 return cryptomgr_schedule_test(data);
 277         }
 278
 279         return NOTIFY_DONE;
 280 }
 281
 282 static struct notifier_block cryptomgr_notifier = {
 283         .notifier_call = cryptomgr_notify,
 284 };
 285
 286 static int __init cryptomgr_init(void)
 287 {
 288         return crypto_register_notifier(&cryptomgr_notifier);
 289 }
 290
 291 static void __exit cryptomgr_exit(void)
 292 {
 293         int err = crypto_unregister_notifier(&cryptomgr_notifier);
 294         BUG_ON(err);
 295 }
 296
 297 subsys_initcall(cryptomgr_init);
 298 module_exit(cryptomgr_exit);
 299
 300 MODULE_LICENSE("GPL");
 301 MODULE_DESCRIPTION("Crypto Algorithm Manager");