Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 206 insertions, 0 deletions

diff --git a/net/ieee80211/ieee80211_crypt.c b/net/ieee80211/ieee80211_crypt.c
new file mode 100644
index 0000000..df5592c
--- /dev/null
+++ b/net/ieee80211/ieee80211_crypt.c
@@ -0,0 +1,206 @@
+/*
+ * 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);