mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Herbert Xu](/assets/img/avatar_default.png)
This patch adds a notifier chain for algorithm/template registration events. This will be used to register compound algorithms such as cbc(aes). In future this will also be passed onto user-space through netlink. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
278 lines
5.8 KiB
C
278 lines
5.8 KiB
C
/*
|
|
* Cryptographic API for algorithms (i.e., low-level API).
|
|
*
|
|
* 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 <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static LIST_HEAD(crypto_template_list);
|
|
|
|
void crypto_larval_error(const char *name)
|
|
{
|
|
struct crypto_alg *alg;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
alg = __crypto_alg_lookup(name);
|
|
up_read(&crypto_alg_sem);
|
|
|
|
if (alg) {
|
|
if (crypto_is_larval(alg)) {
|
|
struct crypto_larval *larval = (void *)alg;
|
|
complete(&larval->completion);
|
|
}
|
|
crypto_mod_put(alg);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_larval_error);
|
|
|
|
static inline int crypto_set_driver_name(struct crypto_alg *alg)
|
|
{
|
|
static const char suffix[] = "-generic";
|
|
char *driver_name = alg->cra_driver_name;
|
|
int len;
|
|
|
|
if (*driver_name)
|
|
return 0;
|
|
|
|
len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
|
|
if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
|
|
return -ENAMETOOLONG;
|
|
|
|
memcpy(driver_name + len, suffix, sizeof(suffix));
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_check_alg(struct crypto_alg *alg)
|
|
{
|
|
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_alignmask & alg->cra_blocksize)
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_blocksize > PAGE_SIZE / 8)
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_priority < 0)
|
|
return -EINVAL;
|
|
|
|
return crypto_set_driver_name(alg);
|
|
}
|
|
|
|
static int __crypto_register_alg(struct crypto_alg *alg)
|
|
{
|
|
struct crypto_alg *q;
|
|
int ret = -EEXIST;
|
|
|
|
atomic_set(&alg->cra_refcnt, 1);
|
|
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
|
if (q == alg)
|
|
goto out;
|
|
if (crypto_is_larval(q) &&
|
|
(!strcmp(alg->cra_name, q->cra_name) ||
|
|
!strcmp(alg->cra_driver_name, q->cra_name))) {
|
|
struct crypto_larval *larval = (void *)q;
|
|
|
|
if (!crypto_mod_get(alg))
|
|
continue;
|
|
larval->adult = alg;
|
|
complete(&larval->completion);
|
|
}
|
|
}
|
|
|
|
list_add(&alg->cra_list, &crypto_alg_list);
|
|
|
|
crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int crypto_register_alg(struct crypto_alg *alg)
|
|
{
|
|
int err;
|
|
|
|
err = crypto_check_alg(alg);
|
|
if (err)
|
|
return err;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
err = __crypto_register_alg(alg);
|
|
up_write(&crypto_alg_sem);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_alg);
|
|
|
|
int crypto_unregister_alg(struct crypto_alg *alg)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
if (likely(!list_empty(&alg->cra_list))) {
|
|
list_del_init(&alg->cra_list);
|
|
ret = 0;
|
|
}
|
|
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
|
|
up_write(&crypto_alg_sem);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
|
|
if (alg->cra_destroy)
|
|
alg->cra_destroy(alg);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
|
|
|
|
int crypto_register_template(struct crypto_template *tmpl)
|
|
{
|
|
struct crypto_template *q;
|
|
int err = -EEXIST;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
list_for_each_entry(q, &crypto_template_list, list) {
|
|
if (q == tmpl)
|
|
goto out;
|
|
}
|
|
|
|
list_add(&tmpl->list, &crypto_template_list);
|
|
crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
|
|
err = 0;
|
|
out:
|
|
up_write(&crypto_alg_sem);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_template);
|
|
|
|
void crypto_unregister_template(struct crypto_template *tmpl)
|
|
{
|
|
struct crypto_instance *inst;
|
|
struct hlist_node *p, *n;
|
|
struct hlist_head *list;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
BUG_ON(list_empty(&tmpl->list));
|
|
list_del_init(&tmpl->list);
|
|
|
|
list = &tmpl->instances;
|
|
hlist_for_each_entry(inst, p, list, list) {
|
|
BUG_ON(list_empty(&inst->alg.cra_list));
|
|
list_del_init(&inst->alg.cra_list);
|
|
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
|
|
}
|
|
|
|
crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
|
|
|
|
up_write(&crypto_alg_sem);
|
|
|
|
hlist_for_each_entry_safe(inst, p, n, list, list) {
|
|
BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
|
|
tmpl->free(inst);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_template);
|
|
|
|
static struct crypto_template *__crypto_lookup_template(const char *name)
|
|
{
|
|
struct crypto_template *q, *tmpl = NULL;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
list_for_each_entry(q, &crypto_template_list, list) {
|
|
if (strcmp(q->name, name))
|
|
continue;
|
|
if (unlikely(!crypto_tmpl_get(q)))
|
|
continue;
|
|
|
|
tmpl = q;
|
|
break;
|
|
}
|
|
up_read(&crypto_alg_sem);
|
|
|
|
return tmpl;
|
|
}
|
|
|
|
struct crypto_template *crypto_lookup_template(const char *name)
|
|
{
|
|
return try_then_request_module(__crypto_lookup_template(name), name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_lookup_template);
|
|
|
|
int crypto_register_instance(struct crypto_template *tmpl,
|
|
struct crypto_instance *inst)
|
|
{
|
|
int err = -EINVAL;
|
|
|
|
if (inst->alg.cra_destroy)
|
|
goto err;
|
|
|
|
err = crypto_check_alg(&inst->alg);
|
|
if (err)
|
|
goto err;
|
|
|
|
inst->alg.cra_module = tmpl->module;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
err = __crypto_register_alg(&inst->alg);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
hlist_add_head(&inst->list, &tmpl->instances);
|
|
inst->tmpl = tmpl;
|
|
|
|
unlock:
|
|
up_write(&crypto_alg_sem);
|
|
|
|
err:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_instance);
|
|
|
|
int crypto_register_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&crypto_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_notifier);
|
|
|
|
int crypto_unregister_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&crypto_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
|
|
|
|
static int __init crypto_algapi_init(void)
|
|
{
|
|
crypto_init_proc();
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crypto_algapi_exit(void)
|
|
{
|
|
crypto_exit_proc();
|
|
}
|
|
|
|
module_init(crypto_algapi_init);
|
|
module_exit(crypto_algapi_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Cryptographic algorithms API");
|