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![Panagiotis Issaris](/assets/img/avatar_default.png)
Signed-off-by: Panagiotis Issaris <takis@issaris.org> Signed-off-by: David S. Miller <davem@davemloft.net>
206 lines
5.2 KiB
C
206 lines
5.2 KiB
C
/*
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* Host AP crypto routines
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*
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* Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. See README and COPYING for
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* more details.
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*
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <net/ieee80211.h>
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MODULE_AUTHOR("Jouni Malinen");
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MODULE_DESCRIPTION("HostAP crypto");
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MODULE_LICENSE("GPL");
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struct ieee80211_crypto_alg {
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struct list_head list;
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struct ieee80211_crypto_ops *ops;
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};
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static LIST_HEAD(ieee80211_crypto_algs);
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static DEFINE_SPINLOCK(ieee80211_crypto_lock);
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void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
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{
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struct ieee80211_crypt_data *entry, *next;
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unsigned long flags;
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spin_lock_irqsave(&ieee->lock, flags);
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list_for_each_entry_safe(entry, next, &ieee->crypt_deinit_list, list) {
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if (atomic_read(&entry->refcnt) != 0 && !force)
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continue;
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list_del(&entry->list);
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if (entry->ops) {
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entry->ops->deinit(entry->priv);
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module_put(entry->ops->owner);
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}
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kfree(entry);
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}
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spin_unlock_irqrestore(&ieee->lock, flags);
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}
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/* After this, crypt_deinit_list won't accept new members */
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void ieee80211_crypt_quiescing(struct ieee80211_device *ieee)
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{
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unsigned long flags;
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spin_lock_irqsave(&ieee->lock, flags);
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ieee->crypt_quiesced = 1;
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spin_unlock_irqrestore(&ieee->lock, flags);
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}
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void ieee80211_crypt_deinit_handler(unsigned long data)
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{
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struct ieee80211_device *ieee = (struct ieee80211_device *)data;
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unsigned long flags;
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ieee80211_crypt_deinit_entries(ieee, 0);
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spin_lock_irqsave(&ieee->lock, flags);
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if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) {
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printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
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"deletion list\n", ieee->dev->name);
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ieee->crypt_deinit_timer.expires = jiffies + HZ;
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add_timer(&ieee->crypt_deinit_timer);
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}
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spin_unlock_irqrestore(&ieee->lock, flags);
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}
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void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
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struct ieee80211_crypt_data **crypt)
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{
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struct ieee80211_crypt_data *tmp;
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unsigned long flags;
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if (*crypt == NULL)
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return;
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tmp = *crypt;
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*crypt = NULL;
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/* must not run ops->deinit() while there may be pending encrypt or
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* decrypt operations. Use a list of delayed deinits to avoid needing
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* locking. */
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spin_lock_irqsave(&ieee->lock, flags);
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if (!ieee->crypt_quiesced) {
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list_add(&tmp->list, &ieee->crypt_deinit_list);
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if (!timer_pending(&ieee->crypt_deinit_timer)) {
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ieee->crypt_deinit_timer.expires = jiffies + HZ;
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add_timer(&ieee->crypt_deinit_timer);
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}
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}
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spin_unlock_irqrestore(&ieee->lock, flags);
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}
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int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
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{
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unsigned long flags;
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struct ieee80211_crypto_alg *alg;
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alg = kzalloc(sizeof(*alg), GFP_KERNEL);
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if (alg == NULL)
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return -ENOMEM;
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alg->ops = ops;
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spin_lock_irqsave(&ieee80211_crypto_lock, flags);
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list_add(&alg->list, &ieee80211_crypto_algs);
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spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
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printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
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ops->name);
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return 0;
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}
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int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
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{
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struct ieee80211_crypto_alg *alg;
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unsigned long flags;
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spin_lock_irqsave(&ieee80211_crypto_lock, flags);
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list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
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if (alg->ops == ops)
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goto found;
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}
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spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
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return -EINVAL;
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found:
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printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
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"'%s'\n", ops->name);
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list_del(&alg->list);
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spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
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kfree(alg);
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return 0;
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}
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struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
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{
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struct ieee80211_crypto_alg *alg;
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unsigned long flags;
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spin_lock_irqsave(&ieee80211_crypto_lock, flags);
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list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
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if (strcmp(alg->ops->name, name) == 0)
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goto found;
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}
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spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
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return NULL;
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found:
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spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
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return alg->ops;
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}
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static void *ieee80211_crypt_null_init(int keyidx)
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{
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return (void *)1;
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}
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static void ieee80211_crypt_null_deinit(void *priv)
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{
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}
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static struct ieee80211_crypto_ops ieee80211_crypt_null = {
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.name = "NULL",
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.init = ieee80211_crypt_null_init,
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.deinit = ieee80211_crypt_null_deinit,
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.owner = THIS_MODULE,
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};
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static int __init ieee80211_crypto_init(void)
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{
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return ieee80211_register_crypto_ops(&ieee80211_crypt_null);
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}
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static void __exit ieee80211_crypto_deinit(void)
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{
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ieee80211_unregister_crypto_ops(&ieee80211_crypt_null);
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BUG_ON(!list_empty(&ieee80211_crypto_algs));
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}
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EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
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EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
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EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
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EXPORT_SYMBOL(ieee80211_crypt_quiescing);
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EXPORT_SYMBOL(ieee80211_register_crypto_ops);
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EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
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EXPORT_SYMBOL(ieee80211_get_crypto_ops);
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module_init(ieee80211_crypto_init);
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module_exit(ieee80211_crypto_deinit);
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