[linux-2.6-block.git] / drivers / staging / rtl8192e / ieee80211 / ieee80211_crypt.c

/*
 * 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 "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;

	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);
		kfree(entry);
	}
}

void ieee80211_crypt_deinit_handler(unsigned long data)
{
	struct ieee80211_device *ieee = (struct ieee80211_device *)data;
	unsigned long flags;

	spin_lock_irqsave(&ieee->lock, flags);
	ieee80211_crypt_deinit_entries(ieee, 0);
	if (!list_empty(&ieee->crypt_deinit_list)) {
		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);
	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 = kzalloc(sizeof(*alg), GFP_KERNEL);
	if (alg == NULL)
		return -ENOMEM;

	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_prefix_len	= 0,
	.extra_postfix_len	= 0,
	.owner			= THIS_MODULE,
};


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

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

	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;
}


void 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);
}

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
//EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
//EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
//EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);

//EXPORT_SYMBOL(ieee80211_register_crypto_ops);
//EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
//EXPORT_SYMBOL(ieee80211_get_crypto_ops);
#else
EXPORT_SYMBOL_NOVERS(ieee80211_crypt_deinit_entries);
EXPORT_SYMBOL_NOVERS(ieee80211_crypt_deinit_handler);
EXPORT_SYMBOL_NOVERS(ieee80211_crypt_delayed_deinit);

EXPORT_SYMBOL_NOVERS(ieee80211_register_crypto_ops);
EXPORT_SYMBOL_NOVERS(ieee80211_unregister_crypto_ops);
EXPORT_SYMBOL_NOVERS(ieee80211_get_crypto_ops);
#endif

//module_init(ieee80211_crypto_init);
//module_exit(ieee80211_crypto_deinit);
Commit	Line	Data
ecdfa446 GKH	1	/*
	2	* Host AP crypto routines
	3	*
	4	* Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
	5	* Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation. See README and COPYING for
	10	* more details.
	11	*
	12	*/
	13
	14	//#include <linux/config.h>
	15	#include <linux/version.h>
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/slab.h>
	19	#include <asm/string.h>
	20	#include <asm/errno.h>
	21
	22	#include "ieee80211.h"
	23
	24	//MODULE_AUTHOR("Jouni Malinen");
	25	//MODULE_DESCRIPTION("HostAP crypto");
	26	//MODULE_LICENSE("GPL");
	27
	28	struct ieee80211_crypto_alg {
	29	struct list_head list;
	30	struct ieee80211_crypto_ops *ops;
	31	};
	32
	33
	34	struct ieee80211_crypto {
	35	struct list_head algs;
	36	spinlock_t lock;
	37	};
	38
	39	static struct ieee80211_crypto *hcrypt;
	40
	41	void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
	42	int force)
	43	{
	44	struct list_head ptr, n;
	45	struct ieee80211_crypt_data *entry;
	46
	47	for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
	48	ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
	49	entry = list_entry(ptr, struct ieee80211_crypt_data, list);
	50
	51	if (atomic_read(&entry->refcnt) != 0 && !force)
	52	continue;
	53
	54	list_del(ptr);
	55
a010a337	56	if (entry->ops)
ecdfa446	57	entry->ops->deinit(entry->priv);
ecdfa446 GKH	58	kfree(entry);
	59	}
	60	}
	61
	62	void ieee80211_crypt_deinit_handler(unsigned long data)
	63	{
	64	struct ieee80211_device ieee = (struct ieee80211_device )data;
	65	unsigned long flags;
	66
	67	spin_lock_irqsave(&ieee->lock, flags);
	68	ieee80211_crypt_deinit_entries(ieee, 0);
	69	if (!list_empty(&ieee->crypt_deinit_list)) {
	70	printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
	71	"deletion list\n", ieee->dev->name);
	72	ieee->crypt_deinit_timer.expires = jiffies + HZ;
	73	add_timer(&ieee->crypt_deinit_timer);
	74	}
	75	spin_unlock_irqrestore(&ieee->lock, flags);
	76
	77	}
	78
	79	void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
	80	struct ieee80211_crypt_data **crypt)
	81	{
	82	struct ieee80211_crypt_data *tmp;
	83	unsigned long flags;
	84
	85	if (*crypt == NULL)
	86	return;
	87
	88	tmp = *crypt;
	89	*crypt = NULL;
	90
	91	/* must not run ops->deinit() while there may be pending encrypt or
	92	* decrypt operations. Use a list of delayed deinits to avoid needing
	93	* locking. */
	94
	95	spin_lock_irqsave(&ieee->lock, flags);
	96	list_add(&tmp->list, &ieee->crypt_deinit_list);
	97	if (!timer_pending(&ieee->crypt_deinit_timer)) {
	98	ieee->crypt_deinit_timer.expires = jiffies + HZ;
	99	add_timer(&ieee->crypt_deinit_timer);
	100	}
	101	spin_unlock_irqrestore(&ieee->lock, flags);
	102	}
	103
	104	int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
	105	{
	106	unsigned long flags;
	107	struct ieee80211_crypto_alg *alg;
	108
	109	if (hcrypt == NULL)
	110	return -1;
	111
7a6cb0d5	112	alg = kzalloc(sizeof(*alg), GFP_KERNEL);
ecdfa446 GKH	113	if (alg == NULL)
	114	return -ENOMEM;
	115
ecdfa446 GKH	116	alg->ops = ops;
	117
	118	spin_lock_irqsave(&hcrypt->lock, flags);
	119	list_add(&alg->list, &hcrypt->algs);
	120	spin_unlock_irqrestore(&hcrypt->lock, flags);
	121
	122	printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
	123	ops->name);
	124
	125	return 0;
	126	}
	127
	128	int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
	129	{
	130	unsigned long flags;
	131	struct list_head *ptr;
	132	struct ieee80211_crypto_alg *del_alg = NULL;
	133
	134	if (hcrypt == NULL)
	135	return -1;
	136
	137	spin_lock_irqsave(&hcrypt->lock, flags);
	138	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
	139	struct ieee80211_crypto_alg *alg =
	140	(struct ieee80211_crypto_alg *) ptr;
	141	if (alg->ops == ops) {
	142	list_del(&alg->list);
	143	del_alg = alg;
	144	break;
	145	}
	146	}
	147	spin_unlock_irqrestore(&hcrypt->lock, flags);
	148
	149	if (del_alg) {
	150	printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
	151	"'%s'\n", ops->name);
	152	kfree(del_alg);
	153	}
	154
	155	return del_alg ? 0 : -1;
	156	}
	157
	158
	159	struct ieee80211_crypto_ops * ieee80211_get_crypto_ops(const char *name)
	160	{
	161	unsigned long flags;
	162	struct list_head *ptr;
	163	struct ieee80211_crypto_alg *found_alg = NULL;
	164
	165	if (hcrypt == NULL)
	166	return NULL;
	167
	168	spin_lock_irqsave(&hcrypt->lock, flags);
	169	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
	170	struct ieee80211_crypto_alg *alg =
	171	(struct ieee80211_crypto_alg *) ptr;
	172	if (strcmp(alg->ops->name, name) == 0) {
	173	found_alg = alg;
	174	break;
	175	}
	176	}
	177	spin_unlock_irqrestore(&hcrypt->lock, flags);
	178
	179	if (found_alg)
180	return found_alg->ops;
181	else
182	return NULL;
183	}
184
185
186	static void * ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
187	static void ieee80211_crypt_null_deinit(void *priv) {}
188
189	static struct ieee80211_crypto_ops ieee80211_crypt_null = {
190	.name = "NULL",
191	.init = ieee80211_crypt_null_init,
192	.deinit = ieee80211_crypt_null_deinit,
193	.encrypt_mpdu = NULL,
194	.decrypt_mpdu = NULL,
195	.encrypt_msdu = NULL,
196	.decrypt_msdu = NULL,
197	.set_key = NULL,
198	.get_key = NULL,
199	.extra_prefix_len = 0,
200	.extra_postfix_len = 0,
201	.owner = THIS_MODULE,
202	};
203
204
205	int __init ieee80211_crypto_init(void)
206	{
207	int ret = -ENOMEM;
208
7a6cb0d5	209	hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
ecdfa446 GKH	210	if (!hcrypt)
	211	goto out;
	212
ecdfa446 GKH	213	INIT_LIST_HEAD(&hcrypt->algs);
	214	spin_lock_init(&hcrypt->lock);
	215
	216	ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
	217	if (ret < 0) {
	218	kfree(hcrypt);
	219	hcrypt = NULL;
	220	}
	221	out:
	222	return ret;
	223	}
	224
	225
27b93f80	226	void ieee80211_crypto_deinit(void)
ecdfa446 GKH	227	{
	228	struct list_head ptr, n;
	229
	230	if (hcrypt == NULL)
	231	return;
	232
	233	for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
	234	ptr = n, n = ptr->next) {
	235	struct ieee80211_crypto_alg *alg =
	236	(struct ieee80211_crypto_alg *) ptr;
	237	list_del(ptr);
	238	printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
	239	"'%s' (deinit)\n", alg->ops->name);
	240	kfree(alg);
	241	}
	242
	243	kfree(hcrypt);
	244	}
	245
	246	#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
	247	//EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
	248	//EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
	249	//EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
	250
	251	//EXPORT_SYMBOL(ieee80211_register_crypto_ops);
	252	//EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
	253	//EXPORT_SYMBOL(ieee80211_get_crypto_ops);
	254	#else
	255	EXPORT_SYMBOL_NOVERS(ieee80211_crypt_deinit_entries);
	256	EXPORT_SYMBOL_NOVERS(ieee80211_crypt_deinit_handler);
	257	EXPORT_SYMBOL_NOVERS(ieee80211_crypt_delayed_deinit);
	258
	259	EXPORT_SYMBOL_NOVERS(ieee80211_register_crypto_ops);
	260	EXPORT_SYMBOL_NOVERS(ieee80211_unregister_crypto_ops);
	261	EXPORT_SYMBOL_NOVERS(ieee80211_get_crypto_ops);
	262	#endif
	263
	264	//module_init(ieee80211_crypto_init);
	265	//module_exit(ieee80211_crypto_deinit);