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/*
* Host AP crypto routines
*
* Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See README and COPYING for
* more details.
*/
struct hostap_crypto_alg {
struct list_head list;
struct hostap_crypto_ops *ops;
};
struct hostap_crypto {
struct list_head algs;
spinlock_t lock;
};
static struct hostap_crypto *hcrypt;
int hostap_register_crypto_ops(struct hostap_crypto_ops *ops)
{
unsigned long flags;
struct hostap_crypto_alg *alg;
if (hcrypt == NULL)
return -1;
alg = (struct hostap_crypto_alg *) kmalloc(sizeof(*alg), GFP_KERNEL);
if (alg == NULL)
return -ENOMEM;
memset(alg, 0, sizeof(*alg));
alg->ops = ops;
spin_lock_irqsave(&hcrypt->lock, flags);
list_add(&alg->list, &hcrypt->algs);
spin_unlock_irqrestore(&hcrypt->lock, flags);
printk(KERN_DEBUG "hostap_crypt: registered algorithm '%s'\n",
ops->name);
return 0;
}
int hostap_unregister_crypto_ops(struct hostap_crypto_ops *ops)
{
unsigned long flags;
struct list_head *ptr;
struct hostap_crypto_alg *del_alg = NULL;
if (hcrypt == NULL)
return -1;
spin_lock_irqsave(&hcrypt->lock, flags);
for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
struct hostap_crypto_alg *alg =
(struct hostap_crypto_alg *) ptr;
if (alg->ops == ops) {
list_del(&alg->list);
del_alg = alg;
break;
}
}
spin_unlock_irqrestore(&hcrypt->lock, flags);
if (del_alg) {
printk(KERN_DEBUG "hostap_crypt: unregistered algorithm "
"'%s'\n", ops->name);
kfree(del_alg);
}
return del_alg ? 0 : -1;
}
struct hostap_crypto_ops * hostap_get_crypto_ops(const char *name)
{
unsigned long flags;
struct list_head *ptr;
struct hostap_crypto_alg *found_alg = NULL;
if (hcrypt == NULL)
return NULL;
spin_lock_irqsave(&hcrypt->lock, flags);
for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
struct hostap_crypto_alg *alg =
(struct hostap_crypto_alg *) ptr;
if (strcmp(alg->ops->name, name) == 0) {
found_alg = alg;
break;
}
}
spin_unlock_irqrestore(&hcrypt->lock, flags);
if (found_alg)
return found_alg->ops;
else
return NULL;
}
static void * hostap_crypt_null_init(int keyidx) { return (void *) 1; }
static void hostap_crypt_null_deinit(void *priv) {}
static struct hostap_crypto_ops hostap_crypt_null = {
.name = "NULL",
.init = hostap_crypt_null_init,
.deinit = hostap_crypt_null_deinit,
.encrypt_mpdu = NULL,
.decrypt_mpdu = NULL,
.encrypt_msdu = NULL,
.decrypt_msdu = NULL,
.set_key = NULL,
.get_key = NULL,
.extra_prefix_len = 0,
.extra_postfix_len = 0
};
static int __init hostap_crypto_init(void)
{
hcrypt = (struct hostap_crypto *) kmalloc(sizeof(*hcrypt), GFP_KERNEL);
if (hcrypt == NULL)
return -ENOMEM;
memset(hcrypt, 0, sizeof(*hcrypt));
INIT_LIST_HEAD(&hcrypt->algs);
spin_lock_init(&hcrypt->lock);
(void) hostap_register_crypto_ops(&hostap_crypt_null);
return 0;
}
static void __exit hostap_crypto_deinit(void)
{
struct list_head *ptr, *n;
if (hcrypt == NULL)
return;
for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
ptr = n, n = ptr->next) {
struct hostap_crypto_alg *alg =
(struct hostap_crypto_alg *) ptr;
list_del(ptr);
printk(KERN_DEBUG "hostap_crypt: unregistered algorithm "
"'%s' (deinit)\n", alg->ops->name);
kfree(alg);
}
kfree(hcrypt);
}
EXPORT_SYMBOL(hostap_register_crypto_ops);
EXPORT_SYMBOL(hostap_unregister_crypto_ops);
EXPORT_SYMBOL(hostap_get_crypto_ops);
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