net/ieee80211/ieee80211_crypt.c - kernel/msm-4.9 - Gitiles

 /*
  * 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/config.h>
 #include <linux/version.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <asm/string.h>
 #include <asm/errno.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;
 };

 struct ieee80211_crypto {
 	struct list_head algs;
 	spinlock_t lock;
 };

 static struct ieee80211_crypto *hcrypt;

 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
 {
 	struct list_head *ptr, *n;
 	struct ieee80211_crypt_data *entry;
 	unsigned long flags;

 	spin_lock_irqsave(&ieee->lock, flags);

 	if (list_empty(&ieee->crypt_deinit_list))
 		goto unlock;

 	for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
 	     ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
 		entry = list_entry(ptr, struct ieee80211_crypt_data, list);

 		if (atomic_read(&entry->refcnt) != 0 && !force)
 			continue;

 		list_del(ptr);

 		if (entry->ops) {
 			entry->ops->deinit(entry->priv);
 			module_put(entry->ops->owner);
 		}
 		kfree(entry);
 	}
       unlock:
 	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;

 	if (hcrypt == NULL)
 		return -1;

 	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 "ieee80211_crypt: registered algorithm '%s'\n",
 	       ops->name);

 	return 0;
 }

 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
 {
 	unsigned long flags;
 	struct list_head *ptr;
 	struct ieee80211_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 ieee80211_crypto_alg *alg =
 		    (struct ieee80211_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 "ieee80211_crypt: unregistered algorithm "
 		       "'%s'\n", ops->name);
 		kfree(del_alg);
 	}

 	return del_alg ? 0 : -1;
 }

 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
 {
 	unsigned long flags;
 	struct list_head *ptr;
 	struct ieee80211_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 ieee80211_crypto_alg *alg =
 		    (struct ieee80211_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 *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,
 	.encrypt_mpdu = NULL,
 	.decrypt_mpdu = NULL,
 	.encrypt_msdu = NULL,
 	.decrypt_msdu = NULL,
 	.set_key = NULL,
 	.get_key = NULL,
 	.extra_mpdu_prefix_len = 0,
 	.extra_mpdu_postfix_len = 0,
 	.owner = THIS_MODULE,
 };

 static int __init ieee80211_crypto_init(void)
 {
 	int ret = -ENOMEM;

 	hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
 	if (!hcrypt)
 		goto out;

 	memset(hcrypt, 0, sizeof(*hcrypt));
 	INIT_LIST_HEAD(&hcrypt->algs);
 	spin_lock_init(&hcrypt->lock);

 	ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
 	if (ret < 0) {
 		kfree(hcrypt);
 		hcrypt = NULL;
 	}
       out:
 	return ret;
 }

 static void __exit ieee80211_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 ieee80211_crypto_alg *alg =
 		    (struct ieee80211_crypto_alg *)ptr;
 		list_del(ptr);
 		printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
 		       "'%s' (deinit)\n", alg->ops->name);
 		kfree(alg);
 	}

 	kfree(hcrypt);
 }

 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);
	/*
	* 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/config.h>
	#include <linux/version.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <asm/string.h>
	#include <asm/errno.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;
	};

	struct ieee80211_crypto {
	struct list_head algs;
	spinlock_t lock;
	};

	static struct ieee80211_crypto *hcrypt;

	void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
	{
	struct list_head ptr, n;
	struct ieee80211_crypt_data *entry;
	unsigned long flags;

	spin_lock_irqsave(&ieee->lock, flags);

	if (list_empty(&ieee->crypt_deinit_list))
	goto unlock;

	for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
	ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
	entry = list_entry(ptr, struct ieee80211_crypt_data, list);

	if (atomic_read(&entry->refcnt) != 0 && !force)
	continue;

	list_del(ptr);

	if (entry->ops) {
	entry->ops->deinit(entry->priv);
	module_put(entry->ops->owner);
	}
	kfree(entry);
	}
	unlock:
	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;

	if (hcrypt == NULL)
	return -1;

	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 "ieee80211_crypt: registered algorithm '%s'\n",
	ops->name);

	return 0;
	}

	int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
	{
	unsigned long flags;
	struct list_head *ptr;
	struct ieee80211_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 ieee80211_crypto_alg *alg =
	(struct ieee80211_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 "ieee80211_crypt: unregistered algorithm "
	"'%s'\n", ops->name);
	kfree(del_alg);
	}

	return del_alg ? 0 : -1;
	}

	struct ieee80211_crypto_ops ieee80211_get_crypto_ops(const char name)
	{
	unsigned long flags;
	struct list_head *ptr;
	struct ieee80211_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 ieee80211_crypto_alg *alg =
	(struct ieee80211_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 *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,
	.encrypt_mpdu = NULL,
	.decrypt_mpdu = NULL,
	.encrypt_msdu = NULL,
	.decrypt_msdu = NULL,
	.set_key = NULL,
	.get_key = NULL,
	.extra_mpdu_prefix_len = 0,
	.extra_mpdu_postfix_len = 0,
	.owner = THIS_MODULE,
	};

	static int __init ieee80211_crypto_init(void)
	{
	int ret = -ENOMEM;

	hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
	if (!hcrypt)
	goto out;

	memset(hcrypt, 0, sizeof(*hcrypt));
	INIT_LIST_HEAD(&hcrypt->algs);
	spin_lock_init(&hcrypt->lock);

	ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
	if (ret < 0) {
	kfree(hcrypt);
	hcrypt = NULL;
	}
	out:
	return ret;
	}

	static void __exit ieee80211_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 ieee80211_crypto_alg *alg =
	(struct ieee80211_crypto_alg *)ptr;
	list_del(ptr);
	printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
	"'%s' (deinit)\n", alg->ops->name);
	kfree(alg);
	}

	kfree(hcrypt);
	}

	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);