--- /dev/null
+/*
+ * Host AP crypto routines
+ *
+ * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.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 = kmalloc(sizeof(*alg), GFP_KERNEL);
+ if (alg == NULL)
+ return -ENOMEM;
+
+ memset(alg, 0, sizeof(*alg));
+ 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);
git://git.onelab.eu / linux-2.6.git / blobdiff