[deliverable/linux.git] / drivers / staging / rtl8192u / 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/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/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)) {
		netdev_dbg(ieee->dev, "%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);

	pr_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) {
		pr_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 __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);
		pr_debug("ieee80211_crypt: unregistered algorithm "
		       "'%s' (deinit)\n", alg->ops->name);
		kfree(alg);
	}

	kfree(hcrypt);
}
Commit	Line	Data
8fc8598e JC	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>
8fc8598e JC	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/slab.h>
3033669e KS	18	#include <linux/string.h>
3033669e KS	19	#include <linux/errno.h>
8fc8598e JC	20
	21	#include "ieee80211.h"
	22
	23	MODULE_AUTHOR("Jouni Malinen");
	24	MODULE_DESCRIPTION("HostAP crypto");
	25	MODULE_LICENSE("GPL");
	26
	27	struct ieee80211_crypto_alg {
	28	struct list_head list;
	29	struct ieee80211_crypto_ops *ops;
	30	};
	31
	32
	33	struct ieee80211_crypto {
	34	struct list_head algs;
	35	spinlock_t lock;
	36	};
	37
	38	static struct ieee80211_crypto *hcrypt;
	39
	40	void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
	41	int force)
	42	{
	43	struct list_head ptr, n;
	44	struct ieee80211_crypt_data *entry;
	45
	46	for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
	47	ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
	48	entry = list_entry(ptr, struct ieee80211_crypt_data, list);
	49
	50	if (atomic_read(&entry->refcnt) != 0 && !force)
	51	continue;
	52
	53	list_del(ptr);
	54
f61fb935	55	if (entry->ops)
8fc8598e	56	entry->ops->deinit(entry->priv);
8fc8598e JC	57	kfree(entry);
	58	}
	59	}
	60
	61	void ieee80211_crypt_deinit_handler(unsigned long data)
	62	{
	63	struct ieee80211_device ieee = (struct ieee80211_device )data;
	64	unsigned long flags;
	65
	66	spin_lock_irqsave(&ieee->lock, flags);
	67	ieee80211_crypt_deinit_entries(ieee, 0);
	68	if (!list_empty(&ieee->crypt_deinit_list)) {
fb99f874	69	netdev_dbg(ieee->dev, "%s: entries remaining in delayed crypt "
8fc8598e JC	70	"deletion list\n", ieee->dev->name);
	71	ieee->crypt_deinit_timer.expires = jiffies + HZ;
	72	add_timer(&ieee->crypt_deinit_timer);
	73	}
	74	spin_unlock_irqrestore(&ieee->lock, flags);
	75
	76	}
	77
	78	void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
	79	struct ieee80211_crypt_data **crypt)
	80	{
	81	struct ieee80211_crypt_data *tmp;
	82	unsigned long flags;
	83
	84	if (*crypt == NULL)
	85	return;
	86
	87	tmp = *crypt;
	88	*crypt = NULL;
	89
	90	/* must not run ops->deinit() while there may be pending encrypt or
	91	* decrypt operations. Use a list of delayed deinits to avoid needing
	92	* locking. */
	93
	94	spin_lock_irqsave(&ieee->lock, flags);
	95	list_add(&tmp->list, &ieee->crypt_deinit_list);
	96	if (!timer_pending(&ieee->crypt_deinit_timer)) {
	97	ieee->crypt_deinit_timer.expires = jiffies + HZ;
	98	add_timer(&ieee->crypt_deinit_timer);
	99	}
	100	spin_unlock_irqrestore(&ieee->lock, flags);
	101	}
	102
	103	int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
	104	{
	105	unsigned long flags;
	106	struct ieee80211_crypto_alg *alg;
	107
	108	if (hcrypt == NULL)
	109	return -1;
	110
7a6cb0d5	111	alg = kzalloc(sizeof(*alg), GFP_KERNEL);
8fc8598e JC	112	if (alg == NULL)
	113	return -ENOMEM;
	114
8fc8598e JC	115	alg->ops = ops;
	116
	117	spin_lock_irqsave(&hcrypt->lock, flags);
	118	list_add(&alg->list, &hcrypt->algs);
	119	spin_unlock_irqrestore(&hcrypt->lock, flags);
	120
fb99f874	121	pr_debug("ieee80211_crypt: registered algorithm '%s'\n",
8fc8598e JC	122	ops->name);
	123
	124	return 0;
	125	}
	126
	127	int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
	128	{
	129	unsigned long flags;
	130	struct list_head *ptr;
	131	struct ieee80211_crypto_alg *del_alg = NULL;
	132
	133	if (hcrypt == NULL)
	134	return -1;
	135
	136	spin_lock_irqsave(&hcrypt->lock, flags);
	137	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
	138	struct ieee80211_crypto_alg *alg =
	139	(struct ieee80211_crypto_alg *) ptr;
	140	if (alg->ops == ops) {
	141	list_del(&alg->list);
	142	del_alg = alg;
	143	break;
	144	}
	145	}
	146	spin_unlock_irqrestore(&hcrypt->lock, flags);
	147
	148	if (del_alg) {
fb99f874	149	pr_debug("ieee80211_crypt: unregistered algorithm "
8fc8598e JC	150	"'%s'\n", ops->name);
	151	kfree(del_alg);
	152	}
	153
	154	return del_alg ? 0 : -1;
	155	}
	156
	157
ff0d38cc	158	struct ieee80211_crypto_ops ieee80211_get_crypto_ops(const char name)
8fc8598e JC	159	{
	160	unsigned long flags;
	161	struct list_head *ptr;
	162	struct ieee80211_crypto_alg *found_alg = NULL;
	163
	164	if (hcrypt == NULL)
	165	return NULL;
	166
	167	spin_lock_irqsave(&hcrypt->lock, flags);
	168	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
	169	struct ieee80211_crypto_alg *alg =
	170	(struct ieee80211_crypto_alg *) ptr;
	171	if (strcmp(alg->ops->name, name) == 0) {
	172	found_alg = alg;
	173	break;
	174	}
	175	}
	176	spin_unlock_irqrestore(&hcrypt->lock, flags);
	177
	178	if (found_alg)
	179	return found_alg->ops;
	180	else
	181	return NULL;
	182	}
	183
	184
ff0d38cc	185	static void ieee80211_crypt_null_init(int keyidx) { return (void ) 1; }
8fc8598e JC	186	static void ieee80211_crypt_null_deinit(void *priv) {}
	187
	188	static struct ieee80211_crypto_ops ieee80211_crypt_null = {
	189	.name = "NULL",
	190	.init = ieee80211_crypt_null_init,
	191	.deinit = ieee80211_crypt_null_deinit,
	192	.encrypt_mpdu = NULL,
	193	.decrypt_mpdu = NULL,
	194	.encrypt_msdu = NULL,
	195	.decrypt_msdu = NULL,
	196	.set_key = NULL,
	197	.get_key = NULL,
	198	.extra_prefix_len = 0,
	199	.extra_postfix_len = 0,
	200	.owner = THIS_MODULE,
	201	};
	202
f61fb935	203	int __init ieee80211_crypto_init(void)
8fc8598e JC	204	{
	205	int ret = -ENOMEM;
	206
7a6cb0d5	207	hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
8fc8598e JC	208	if (!hcrypt)
	209	goto out;
	210
8fc8598e JC	211	INIT_LIST_HEAD(&hcrypt->algs);
	212	spin_lock_init(&hcrypt->lock);
	213
	214	ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
	215	if (ret < 0) {
	216	kfree(hcrypt);
	217	hcrypt = NULL;
	218	}
	219	out:
	220	return ret;
	221	}
	222
f61fb935	223	void __exit ieee80211_crypto_deinit(void)
8fc8598e JC	224	{
	225	struct list_head ptr, n;
	226
	227	if (hcrypt == NULL)
	228	return;
	229
	230	for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
	231	ptr = n, n = ptr->next) {
	232	struct ieee80211_crypto_alg *alg =
	233	(struct ieee80211_crypto_alg *) ptr;
	234	list_del(ptr);
fb99f874	235	pr_debug("ieee80211_crypt: unregistered algorithm "
8fc8598e JC	236	"'%s' (deinit)\n", alg->ops->name);
	237	kfree(alg);
	238	}
	239
	240	kfree(hcrypt);
	241	}