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/*
* Host AP crypto routines
*
* Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
* Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
*
* 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.
*
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <net/ieee80211.h>
MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("HostAP crypto");
MODULE_LICENSE("GPL");
struct ieee80211_crypto_alg {
struct list_head list;
struct ieee80211_crypto_ops *ops;
};
static LIST_HEAD(ieee80211_crypto_algs);
static DEFINE_SPINLOCK(ieee80211_crypto_lock);
void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
{
struct ieee80211_crypt_data *entry, *next;
unsigned long flags;
spin_lock_irqsave(&ieee->lock, flags);
list_for_each_entry_safe(entry, next, &ieee->crypt_deinit_list, list) {
if (atomic_read(&entry->refcnt) != 0 && !force)
continue;
list_del(&entry->list);
if (entry->ops) {
entry->ops->deinit(entry->priv);
module_put(entry->ops->owner);
}
kfree(entry);
}
spin_unlock_irqrestore(&ieee->lock, flags);
}
/* After this, crypt_deinit_list won't accept new members */
void ieee80211_crypt_quiescing(struct ieee80211_device *ieee)
{
unsigned long flags;
spin_lock_irqsave(&ieee->lock, flags);
ieee->crypt_quiesced = 1;
spin_unlock_irqrestore(&ieee->lock, flags);
}
void ieee80211_crypt_deinit_handler(unsigned long data)
{
struct ieee80211_device *ieee = (struct ieee80211_device *)data;
unsigned long flags;
ieee80211_crypt_deinit_entries(ieee, 0);
spin_lock_irqsave(&ieee->lock, flags);
if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) {
printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
"deletion list\n", ieee->dev->name);
ieee->crypt_deinit_timer.expires = jiffies + HZ;
add_timer(&ieee->crypt_deinit_timer);
}
spin_unlock_irqrestore(&ieee->lock, flags);
}
void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
struct ieee80211_crypt_data **crypt)
{
struct ieee80211_crypt_data *tmp;
unsigned long flags;
if (*crypt == NULL)
return;
tmp = *crypt;
*crypt = NULL;
/* must not run ops->deinit() while there may be pending encrypt or
* decrypt operations. Use a list of delayed deinits to avoid needing
* locking. */
spin_lock_irqsave(&ieee->lock, flags);
if (!ieee->crypt_quiesced) {
list_add(&tmp->list, &ieee->crypt_deinit_list);
if (!timer_pending(&ieee->crypt_deinit_timer)) {
ieee->crypt_deinit_timer.expires = jiffies + HZ;
add_timer(&ieee->crypt_deinit_timer);
}
}
spin_unlock_irqrestore(&ieee->lock, flags);
}
int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
{
unsigned long flags;
struct ieee80211_crypto_alg *alg;
alg = kzalloc(sizeof(*alg), GFP_KERNEL);
if (alg == NULL)
return -ENOMEM;
alg->ops = ops;
spin_lock_irqsave(&ieee80211_crypto_lock, flags);
list_add(&alg->list, &ieee80211_crypto_algs);
spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
ops->name);
return 0;
}
int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
{
struct ieee80211_crypto_alg *alg;
unsigned long flags;
spin_lock_irqsave(&ieee80211_crypto_lock, flags);
list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
if (alg->ops == ops)
goto found;
}
spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
return -EINVAL;
found:
printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
"'%s'\n", ops->name);
list_del(&alg->list);
spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
kfree(alg);
return 0;
}
struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
{
struct ieee80211_crypto_alg *alg;
unsigned long flags;
spin_lock_irqsave(&ieee80211_crypto_lock, flags);
list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
if (strcmp(alg->ops->name, name) == 0)
goto found;
}
spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
return NULL;
found:
spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
return alg->ops;
}
static void *ieee80211_crypt_null_init(int keyidx)
{
return (void *)1;
}
static void ieee80211_crypt_null_deinit(void *priv)
{
}
static struct ieee80211_crypto_ops ieee80211_crypt_null = {
.name = "NULL",
.init = ieee80211_crypt_null_init,
.deinit = ieee80211_crypt_null_deinit,
.owner = THIS_MODULE,
};
static int __init ieee80211_crypto_init(void)
{
return ieee80211_register_crypto_ops(&ieee80211_crypt_null);
}
static void __exit ieee80211_crypto_deinit(void)
{
ieee80211_unregister_crypto_ops(&ieee80211_crypt_null);
BUG_ON(!list_empty(&ieee80211_crypto_algs));
}
EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
EXPORT_SYMBOL(ieee80211_crypt_quiescing);
EXPORT_SYMBOL(ieee80211_register_crypto_ops);
EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
EXPORT_SYMBOL(ieee80211_get_crypto_ops);
module_init(ieee80211_crypto_init);
module_exit(ieee80211_crypto_deinit);
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