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- /*
- * Create default crypto algorithm instances.
- *
- * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- */
- #include <crypto/internal/aead.h>
- #include <linux/ctype.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/kthread.h>
- #include <linux/module.h>
- #include <linux/notifier.h>
- #include <linux/rtnetlink.h>
- #include <linux/sched.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include "internal.h"
- struct cryptomgr_param {
- struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
- struct {
- struct rtattr attr;
- struct crypto_attr_type data;
- } type;
- union {
- struct rtattr attr;
- struct {
- struct rtattr attr;
- struct crypto_attr_alg data;
- } alg;
- struct {
- struct rtattr attr;
- struct crypto_attr_u32 data;
- } nu32;
- } attrs[CRYPTO_MAX_ATTRS];
- char larval[CRYPTO_MAX_ALG_NAME];
- char template[CRYPTO_MAX_ALG_NAME];
- u32 otype;
- u32 omask;
- };
- struct crypto_test_param {
- char driver[CRYPTO_MAX_ALG_NAME];
- char alg[CRYPTO_MAX_ALG_NAME];
- u32 type;
- };
- static int cryptomgr_probe(void *data)
- {
- struct cryptomgr_param *param = data;
- struct crypto_template *tmpl;
- struct crypto_instance *inst;
- int err;
- tmpl = crypto_lookup_template(param->template);
- if (!tmpl)
- goto err;
- do {
- if (tmpl->create) {
- err = tmpl->create(tmpl, param->tb);
- continue;
- }
- inst = tmpl->alloc(param->tb);
- if (IS_ERR(inst))
- err = PTR_ERR(inst);
- else if ((err = crypto_register_instance(tmpl, inst)))
- tmpl->free(inst);
- } while (err == -EAGAIN && !signal_pending(current));
- crypto_tmpl_put(tmpl);
- if (err)
- goto err;
- out:
- kfree(param);
- module_put_and_exit(0);
- err:
- crypto_larval_error(param->larval, param->otype, param->omask);
- goto out;
- }
- static int cryptomgr_schedule_probe(struct crypto_larval *larval)
- {
- struct task_struct *thread;
- struct cryptomgr_param *param;
- const char *name = larval->alg.cra_name;
- const char *p;
- unsigned int len;
- int i;
- if (!try_module_get(THIS_MODULE))
- goto err;
- param = kzalloc(sizeof(*param), GFP_KERNEL);
- if (!param)
- goto err_put_module;
- for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
- ;
- len = p - name;
- if (!len || *p != '(')
- goto err_free_param;
- memcpy(param->template, name, len);
- i = 0;
- for (;;) {
- int notnum = 0;
- name = ++p;
- len = 0;
- for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
- notnum |= !isdigit(*p);
- if (*p == '(') {
- int recursion = 0;
- for (;;) {
- if (!*++p)
- goto err_free_param;
- if (*p == '(')
- recursion++;
- else if (*p == ')' && !recursion--)
- break;
- }
- notnum = 1;
- p++;
- }
- len = p - name;
- if (!len)
- goto err_free_param;
- if (notnum) {
- param->attrs[i].alg.attr.rta_len =
- sizeof(param->attrs[i].alg);
- param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
- memcpy(param->attrs[i].alg.data.name, name, len);
- } else {
- param->attrs[i].nu32.attr.rta_len =
- sizeof(param->attrs[i].nu32);
- param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
- param->attrs[i].nu32.data.num =
- simple_strtol(name, NULL, 0);
- }
- param->tb[i + 1] = ¶m->attrs[i].attr;
- i++;
- if (i >= CRYPTO_MAX_ATTRS)
- goto err_free_param;
- if (*p == ')')
- break;
- if (*p != ',')
- goto err_free_param;
- }
- if (!i)
- goto err_free_param;
- param->tb[i + 1] = NULL;
- param->type.attr.rta_len = sizeof(param->type);
- param->type.attr.rta_type = CRYPTOA_TYPE;
- param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
- param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
- param->tb[0] = ¶m->type.attr;
- param->otype = larval->alg.cra_flags;
- param->omask = larval->mask;
- memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
- thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
- if (IS_ERR(thread))
- goto err_free_param;
- return NOTIFY_STOP;
- err_free_param:
- kfree(param);
- err_put_module:
- module_put(THIS_MODULE);
- err:
- return NOTIFY_OK;
- }
- static int cryptomgr_test(void *data)
- {
- struct crypto_test_param *param = data;
- u32 type = param->type;
- int err = 0;
- #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
- goto skiptest;
- #endif
- if (type & CRYPTO_ALG_TESTED)
- goto skiptest;
- err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
- skiptest:
- crypto_alg_tested(param->driver, err);
- kfree(param);
- module_put_and_exit(0);
- }
- static int cryptomgr_schedule_test(struct crypto_alg *alg)
- {
- struct task_struct *thread;
- struct crypto_test_param *param;
- u32 type;
- if (!try_module_get(THIS_MODULE))
- goto err;
- param = kzalloc(sizeof(*param), GFP_KERNEL);
- if (!param)
- goto err_put_module;
- memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
- memcpy(param->alg, alg->cra_name, sizeof(param->alg));
- type = alg->cra_flags;
- /* This piece of crap needs to disappear into per-type test hooks. */
- if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
- CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
- ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
- alg->cra_ablkcipher.ivsize)) ||
- (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
- alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
- type |= CRYPTO_ALG_TESTED;
- param->type = type;
- thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
- if (IS_ERR(thread))
- goto err_free_param;
- return NOTIFY_STOP;
- err_free_param:
- kfree(param);
- err_put_module:
- module_put(THIS_MODULE);
- err:
- return NOTIFY_OK;
- }
- static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
- void *data)
- {
- switch (msg) {
- case CRYPTO_MSG_ALG_REQUEST:
- return cryptomgr_schedule_probe(data);
- case CRYPTO_MSG_ALG_REGISTER:
- return cryptomgr_schedule_test(data);
- }
- return NOTIFY_DONE;
- }
- static struct notifier_block cryptomgr_notifier = {
- .notifier_call = cryptomgr_notify,
- };
- static int __init cryptomgr_init(void)
- {
- return crypto_register_notifier(&cryptomgr_notifier);
- }
- static void __exit cryptomgr_exit(void)
- {
- int err = crypto_unregister_notifier(&cryptomgr_notifier);
- BUG_ON(err);
- }
- subsys_initcall(cryptomgr_init);
- module_exit(cryptomgr_exit);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("Crypto Algorithm Manager");
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