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/completion.h>
  15#include <linux/ctype.h>
  16#include <linux/err.h>
  17#include <linux/init.h>
  18#include <linux/kthread.h>
  19#include <linux/module.h>
  20#include <linux/notifier.h>
  21#include <linux/rtnetlink.h>
  22#include <linux/sched.h>
  23#include <linux/slab.h>
  24#include <linux/string.h>
  25
  26#include "internal.h"
  27
  28struct cryptomgr_param {
  29        struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
  30
  31        struct {
  32                struct rtattr attr;
  33                struct crypto_attr_type data;
  34        } type;
  35
  36        union {
  37                struct rtattr attr;
  38                struct {
  39                        struct rtattr attr;
  40                        struct crypto_attr_alg data;
  41                } alg;
  42                struct {
  43                        struct rtattr attr;
  44                        struct crypto_attr_u32 data;
  45                } nu32;
  46        } attrs[CRYPTO_MAX_ATTRS];
  47
  48        char template[CRYPTO_MAX_ALG_NAME];
  49
  50        struct crypto_larval *larval;
  51
  52        u32 otype;
  53        u32 omask;
  54};
  55
  56struct crypto_test_param {
  57        char driver[CRYPTO_MAX_ALG_NAME];
  58        char alg[CRYPTO_MAX_ALG_NAME];
  59        u32 type;
  60};
  61
  62static int cryptomgr_probe(void *data)
  63{
  64        struct cryptomgr_param *param = data;
  65        struct crypto_template *tmpl;
  66        struct crypto_instance *inst;
  67        int err;
  68
  69        tmpl = crypto_lookup_template(param->template);
  70        if (!tmpl)
  71                goto out;
  72
  73        do {
  74                if (tmpl->create) {
  75                        err = tmpl->create(tmpl, param->tb);
  76                        continue;
  77                }
  78
  79                inst = tmpl->alloc(param->tb);
  80                if (IS_ERR(inst))
  81                        err = PTR_ERR(inst);
  82                else if ((err = crypto_register_instance(tmpl, inst)))
  83                        tmpl->free(inst);
  84        } while (err == -EAGAIN && !signal_pending(current));
  85
  86        crypto_tmpl_put(tmpl);
  87
  88out:
  89        complete_all(&param->larval->completion);
  90        crypto_alg_put(&param->larval->alg);
  91        kfree(param);
  92        module_put_and_exit(0);
  93}
  94
  95static int cryptomgr_schedule_probe(struct crypto_larval *larval)
  96{
  97        struct task_struct *thread;
  98        struct cryptomgr_param *param;
  99        const char *name = larval->alg.cra_name;
 100        const char *p;
 101        unsigned int len;
 102        int i;
 103
 104        if (!try_module_get(THIS_MODULE))
 105                goto err;
 106
 107        param = kzalloc(sizeof(*param), GFP_KERNEL);
 108        if (!param)
 109                goto err_put_module;
 110
 111        for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
 112                ;
 113
 114        len = p - name;
 115        if (!len || *p != '(')
 116                goto err_free_param;
 117
 118        memcpy(param->template, name, len);
 119
 120        i = 0;
 121        for (;;) {
 122                int notnum = 0;
 123
 124                name = ++p;
 125                len = 0;
 126
 127                for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
 128                        notnum |= !isdigit(*p);
 129
 130                if (*p == '(') {
 131                        int recursion = 0;
 132
 133                        for (;;) {
 134                                if (!*++p)
 135                                        goto err_free_param;
 136                                if (*p == '(')
 137                                        recursion++;
 138                                else if (*p == ')' && !recursion--)
 139                                        break;
 140                        }
 141
 142                        notnum = 1;
 143                        p++;
 144                }
 145
 146                len = p - name;
 147                if (!len)
 148                        goto err_free_param;
 149
 150                if (notnum) {
 151                        param->attrs[i].alg.attr.rta_len =
 152                                sizeof(param->attrs[i].alg);
 153                        param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
 154                        memcpy(param->attrs[i].alg.data.name, name, len);
 155                } else {
 156                        param->attrs[i].nu32.attr.rta_len =
 157                                sizeof(param->attrs[i].nu32);
 158                        param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
 159                        param->attrs[i].nu32.data.num =
 160                                simple_strtol(name, NULL, 0);
 161                }
 162
 163                param->tb[i + 1] = &param->attrs[i].attr;
 164                i++;
 165
 166                if (i >= CRYPTO_MAX_ATTRS)
 167                        goto err_free_param;
 168
 169                if (*p == ')')
 170                        break;
 171
 172                if (*p != ',')
 173                        goto err_free_param;
 174        }
 175
 176        if (!i)
 177                goto err_free_param;
 178
 179        param->tb[i + 1] = NULL;
 180
 181        param->type.attr.rta_len = sizeof(param->type);
 182        param->type.attr.rta_type = CRYPTOA_TYPE;
 183        param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
 184        param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
 185        param->tb[0] = &param->type.attr;
 186
 187        param->otype = larval->alg.cra_flags;
 188        param->omask = larval->mask;
 189
 190        crypto_alg_get(&larval->alg);
 191        param->larval = larval;
 192
 193        thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
 194        if (IS_ERR(thread))
 195                goto err_put_larval;
 196
 197        wait_for_completion_interruptible(&larval->completion);
 198
 199        return NOTIFY_STOP;
 200
 201err_put_larval:
 202        crypto_alg_put(&larval->alg);
 203err_free_param:
 204        kfree(param);
 205err_put_module:
 206        module_put(THIS_MODULE);
 207err:
 208        return NOTIFY_OK;
 209}
 210
 211static int cryptomgr_test(void *data)
 212{
 213        struct crypto_test_param *param = data;
 214        u32 type = param->type;
 215        int err = 0;
 216
 217#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
 218        goto skiptest;
 219#endif
 220
 221        if (type & CRYPTO_ALG_TESTED)
 222                goto skiptest;
 223
 224        err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
 225
 226skiptest:
 227        crypto_alg_tested(param->driver, err);
 228
 229        kfree(param);
 230        module_put_and_exit(0);
 231}
 232
 233static int cryptomgr_schedule_test(struct crypto_alg *alg)
 234{
 235        struct task_struct *thread;
 236        struct crypto_test_param *param;
 237        u32 type;
 238
 239        if (!try_module_get(THIS_MODULE))
 240                goto err;
 241
 242        param = kzalloc(sizeof(*param), GFP_KERNEL);
 243        if (!param)
 244                goto err_put_module;
 245
 246        memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
 247        memcpy(param->alg, alg->cra_name, sizeof(param->alg));
 248        type = alg->cra_flags;
 249
 250        /* This piece of crap needs to disappear into per-type test hooks. */
 251        if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
 252               CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
 253             ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 254              CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
 255                                          alg->cra_ablkcipher.ivsize)) ||
 256            (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
 257             alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
 258                type |= CRYPTO_ALG_TESTED;
 259
 260        param->type = type;
 261
 262        thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
 263        if (IS_ERR(thread))
 264                goto err_free_param;
 265
 266        return NOTIFY_STOP;
 267
 268err_free_param:
 269        kfree(param);
 270err_put_module:
 271        module_put(THIS_MODULE);
 272err:
 273        return NOTIFY_OK;
 274}
 275
 276static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
 277                            void *data)
 278{
 279        switch (msg) {
 280        case CRYPTO_MSG_ALG_REQUEST:
 281                return cryptomgr_schedule_probe(data);
 282        case CRYPTO_MSG_ALG_REGISTER:
 283                return cryptomgr_schedule_test(data);
 284        }
 285
 286        return NOTIFY_DONE;
 287}
 288
 289static struct notifier_block cryptomgr_notifier = {
 290        .notifier_call = cryptomgr_notify,
 291};
 292
 293static int __init cryptomgr_init(void)
 294{
 295        return crypto_register_notifier(&cryptomgr_notifier);
 296}
 297
 298static void __exit cryptomgr_exit(void)
 299{
 300        int err = crypto_unregister_notifier(&cryptomgr_notifier);
 301        BUG_ON(err);
 302}
 303
 304subsys_initcall(cryptomgr_init);
 305module_exit(cryptomgr_exit);
 306
 307MODULE_LICENSE("GPL");
 308MODULE_DESCRIPTION("Crypto Algorithm Manager");
 309
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