linux/crypto/algboss.c
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   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
  26struct 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
  53struct crypto_test_param {
  54        char driver[CRYPTO_MAX_ALG_NAME];
  55        char alg[CRYPTO_MAX_ALG_NAME];
  56        u32 type;
  57};
  58
  59static 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
  83out:
  84        kfree(param);
  85        module_put_and_exit(0);
  86
  87err:
  88        crypto_larval_error(param->larval, param->otype, param->omask);
  89        goto out;
  90}
  91
  92static 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
 195err_free_param:
 196        kfree(param);
 197err_put_module:
 198        module_put(THIS_MODULE);
 199err:
 200        return NOTIFY_OK;
 201}
 202
 203static 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
 214skiptest:
 215        crypto_alg_tested(param->driver, err);
 216
 217        kfree(param);
 218        module_put_and_exit(0);
 219}
 220
 221static 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
 256err_free_param:
 257        kfree(param);
 258err_put_module:
 259        module_put(THIS_MODULE);
 260err:
 261        return NOTIFY_OK;
 262}
 263
 264static 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
 277static struct notifier_block cryptomgr_notifier = {
 278        .notifier_call = cryptomgr_notify,
 279};
 280
 281static int __init cryptomgr_init(void)
 282{
 283        int err;
 284
 285        err = testmgr_init();
 286        if (err)
 287                return err;
 288
 289        err = crypto_register_notifier(&cryptomgr_notifier);
 290        if (err)
 291                goto free_testmgr;
 292
 293        return 0;
 294
 295free_testmgr:
 296        testmgr_exit();
 297        return err;
 298}
 299
 300static void __exit cryptomgr_exit(void)
 301{
 302        int err = crypto_unregister_notifier(&cryptomgr_notifier);
 303        BUG_ON(err);
 304
 305        testmgr_exit();
 306}
 307
 308subsys_initcall(cryptomgr_init);
 309module_exit(cryptomgr_exit);
 310
 311MODULE_LICENSE("GPL");
 312MODULE_DESCRIPTION("Crypto Algorithm Manager");
 313