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/slab.h>
  23#include <linux/string.h>
  24
  25#include "internal.h"
  26
  27struct 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
  54struct crypto_test_param {
  55        char driver[CRYPTO_MAX_ALG_NAME];
  56        char alg[CRYPTO_MAX_ALG_NAME];
  57        u32 type;
  58};
  59
  60static 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
  89out:
  90        kfree(param);
  91        module_put_and_exit(0);
  92
  93err:
  94        crypto_larval_error(param->larval, param->otype, param->omask);
  95        goto out;
  96}
  97
  98static 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
 201err_free_param:
 202        kfree(param);
 203err_put_module:
 204        module_put(THIS_MODULE);
 205err:
 206        return NOTIFY_OK;
 207}
 208
 209static int cryptomgr_test(void *data)
 210{
 211        struct crypto_test_param *param = data;
 212        u32 type = param->type;
 213        int err = 0;
 214
 215#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
 216        goto skiptest;
 217#endif
 218
 219        if (type & CRYPTO_ALG_TESTED)
 220                goto skiptest;
 221
 222        err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
 223
 224skiptest:
 225        crypto_alg_tested(param->driver, err);
 226
 227        kfree(param);
 228        module_put_and_exit(0);
 229}
 230
 231static int cryptomgr_schedule_test(struct crypto_alg *alg)
 232{
 233        struct task_struct *thread;
 234        struct crypto_test_param *param;
 235        u32 type;
 236
 237        if (!try_module_get(THIS_MODULE))
 238                goto err;
 239
 240        param = kzalloc(sizeof(*param), GFP_KERNEL);
 241        if (!param)
 242                goto err_put_module;
 243
 244        memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
 245        memcpy(param->alg, alg->cra_name, sizeof(param->alg));
 246        type = alg->cra_flags;
 247
 248        /* This piece of crap needs to disappear into per-type test hooks. */
 249        if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
 250               CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
 251             ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 252              CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
 253                                          alg->cra_ablkcipher.ivsize)) ||
 254            (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
 255             alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
 256                type |= CRYPTO_ALG_TESTED;
 257
 258        param->type = type;
 259
 260        thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
 261        if (IS_ERR(thread))
 262                goto err_free_param;
 263
 264        return NOTIFY_STOP;
 265
 266err_free_param:
 267        kfree(param);
 268err_put_module:
 269        module_put(THIS_MODULE);
 270err:
 271        return NOTIFY_OK;
 272}
 273
 274static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
 275                            void *data)
 276{
 277        switch (msg) {
 278        case CRYPTO_MSG_ALG_REQUEST:
 279                return cryptomgr_schedule_probe(data);
 280        case CRYPTO_MSG_ALG_REGISTER:
 281                return cryptomgr_schedule_test(data);
 282        }
 283
 284        return NOTIFY_DONE;
 285}
 286
 287static struct notifier_block cryptomgr_notifier = {
 288        .notifier_call = cryptomgr_notify,
 289};
 290
 291static int __init cryptomgr_init(void)
 292{
 293        return crypto_register_notifier(&cryptomgr_notifier);
 294}
 295
 296static void __exit cryptomgr_exit(void)
 297{
 298        int err = crypto_unregister_notifier(&cryptomgr_notifier);
 299        BUG_ON(err);
 300}
 301
 302subsys_initcall(cryptomgr_init);
 303module_exit(cryptomgr_exit);
 304
 305MODULE_LICENSE("GPL");
 306MODULE_DESCRIPTION("Crypto Algorithm Manager");
 307
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