[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / 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 <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(struct ieee80211_device *ieee,
				       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,
};

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);
Commit	Line	Data
b453872c JG	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 <net/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
b453872c JG	33	struct ieee80211_crypto {
	34	struct list_head algs;
	35	spinlock_t lock;
	36	};
	37
	38	static struct ieee80211_crypto *hcrypt;
	39
0edd5b44	40	void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
b453872c JG	41	{
	42	struct list_head ptr, n;
	43	struct ieee80211_crypt_data *entry;
20d64713	44	unsigned long flags;
b453872c	45
20d64713	46	spin_lock_irqsave(&ieee->lock, flags);
0ad0c3c6 JK	47
	48	if (list_empty(&ieee->crypt_deinit_list))
	49	goto unlock;
	50
b453872c JG	51	for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
	52	ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
	53	entry = list_entry(ptr, struct ieee80211_crypt_data, list);
	54
	55	if (atomic_read(&entry->refcnt) != 0 && !force)
	56	continue;
	57
	58	list_del(ptr);
	59
	60	if (entry->ops) {
	61	entry->ops->deinit(entry->priv);
	62	module_put(entry->ops->owner);
	63	}
	64	kfree(entry);
	65	}
0ad0c3c6 JK	66	unlock:
	67	spin_unlock_irqrestore(&ieee->lock, flags);
	68	}
	69
	70	/* After this, crypt_deinit_list won't accept new members */
	71	void ieee80211_crypt_quiescing(struct ieee80211_device *ieee)
	72	{
	73	unsigned long flags;
	74
	75	spin_lock_irqsave(&ieee->lock, flags);
	76	ieee->crypt_quiesced = 1;
20d64713	77	spin_unlock_irqrestore(&ieee->lock, flags);
b453872c JG	78	}
	79
	80	void ieee80211_crypt_deinit_handler(unsigned long data)
	81	{
	82	struct ieee80211_device ieee = (struct ieee80211_device )data;
0ad0c3c6	83	unsigned long flags;
b453872c	84
b453872c	85	ieee80211_crypt_deinit_entries(ieee, 0);
0ad0c3c6 JK	86
	87	spin_lock_irqsave(&ieee->lock, flags);
	88	if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) {
b453872c JG	89	printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
	90	"deletion list\n", ieee->dev->name);
	91	ieee->crypt_deinit_timer.expires = jiffies + HZ;
	92	add_timer(&ieee->crypt_deinit_timer);
	93	}
0ad0c3c6	94	spin_unlock_irqrestore(&ieee->lock, flags);
b453872c JG	95	}
	96
	97	void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
	98	struct ieee80211_crypt_data **crypt)
	99	{
	100	struct ieee80211_crypt_data *tmp;
	101	unsigned long flags;
	102
	103	if (*crypt == NULL)
	104	return;
	105
	106	tmp = *crypt;
	107	*crypt = NULL;
	108
	109	/* must not run ops->deinit() while there may be pending encrypt or
	110	* decrypt operations. Use a list of delayed deinits to avoid needing
	111	* locking. */
	112
	113	spin_lock_irqsave(&ieee->lock, flags);
0ad0c3c6 JK	114	if (!ieee->crypt_quiesced) {
	115	list_add(&tmp->list, &ieee->crypt_deinit_list);
	116	if (!timer_pending(&ieee->crypt_deinit_timer)) {
	117	ieee->crypt_deinit_timer.expires = jiffies + HZ;
	118	add_timer(&ieee->crypt_deinit_timer);
	119	}
b453872c JG	120	}
	121	spin_unlock_irqrestore(&ieee->lock, flags);
	122	}
	123
	124	int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
	125	{
	126	unsigned long flags;
	127	struct ieee80211_crypto_alg *alg;
	128
	129	if (hcrypt == NULL)
	130	return -1;
	131
	132	alg = kmalloc(sizeof(*alg), GFP_KERNEL);
	133	if (alg == NULL)
	134	return -ENOMEM;
	135
	136	memset(alg, 0, sizeof(*alg));
	137	alg->ops = ops;
	138
	139	spin_lock_irqsave(&hcrypt->lock, flags);
	140	list_add(&alg->list, &hcrypt->algs);
	141	spin_unlock_irqrestore(&hcrypt->lock, flags);
	142
	143	printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
	144	ops->name);
	145
	146	return 0;
	147	}
	148
	149	int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
	150	{
	151	unsigned long flags;
	152	struct list_head *ptr;
	153	struct ieee80211_crypto_alg *del_alg = NULL;
	154
	155	if (hcrypt == NULL)
	156	return -1;
	157
	158	spin_lock_irqsave(&hcrypt->lock, flags);
	159	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
	160	struct ieee80211_crypto_alg *alg =
0edd5b44	161	(struct ieee80211_crypto_alg *)ptr;
b453872c JG	162	if (alg->ops == ops) {
	163	list_del(&alg->list);
	164	del_alg = alg;
	165	break;
	166	}
	167	}
	168	spin_unlock_irqrestore(&hcrypt->lock, flags);
	169
	170	if (del_alg) {
	171	printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
	172	"'%s'\n", ops->name);
	173	kfree(del_alg);
	174	}
	175
	176	return del_alg ? 0 : -1;
	177	}
	178
0edd5b44	179	struct ieee80211_crypto_ops ieee80211_get_crypto_ops(const char name)
b453872c JG	180	{
	181	unsigned long flags;
	182	struct list_head *ptr;
	183	struct ieee80211_crypto_alg *found_alg = NULL;
	184
	185	if (hcrypt == NULL)
	186	return NULL;
	187
	188	spin_lock_irqsave(&hcrypt->lock, flags);
	189	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
	190	struct ieee80211_crypto_alg *alg =
0edd5b44	191	(struct ieee80211_crypto_alg *)ptr;
b453872c JG	192	if (strcmp(alg->ops->name, name) == 0) {
	193	found_alg = alg;
	194	break;
	195	}
	196	}
	197	spin_unlock_irqrestore(&hcrypt->lock, flags);
	198
	199	if (found_alg)
	200	return found_alg->ops;
	201	else
	202	return NULL;
	203	}
	204
20d64713 JK	205	static void ieee80211_crypt_null_init(struct ieee80211_device ieee,
20d64713 JK	206	int keyidx)
0edd5b44 JG	207	{
	208	return (void *)1;
	209	}
	210	static void ieee80211_crypt_null_deinit(void *priv)
	211	{
	212	}
b453872c JG	213
b453872c JG	214	static struct ieee80211_crypto_ops ieee80211_crypt_null = {
74079fdc JK	215	.name = "NULL",
	216	.init = ieee80211_crypt_null_init,
	217	.deinit = ieee80211_crypt_null_deinit,
	218	.encrypt_mpdu = NULL,
	219	.decrypt_mpdu = NULL,
	220	.encrypt_msdu = NULL,
	221	.decrypt_msdu = NULL,
	222	.set_key = NULL,
	223	.get_key = NULL,
	224	.extra_prefix_len = 0,
	225	.extra_postfix_len = 0,
	226	.owner = THIS_MODULE,
b453872c JG	227	};
b453872c JG	228
b453872c JG	229	static int __init ieee80211_crypto_init(void)
	230	{
	231	int ret = -ENOMEM;
	232
	233	hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
	234	if (!hcrypt)
	235	goto out;
	236
	237	memset(hcrypt, 0, sizeof(*hcrypt));
	238	INIT_LIST_HEAD(&hcrypt->algs);
	239	spin_lock_init(&hcrypt->lock);
	240
	241	ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
	242	if (ret < 0) {
	243	kfree(hcrypt);
	244	hcrypt = NULL;
	245	}
0edd5b44	246	out:
b453872c JG	247	return ret;
	248	}
	249
b453872c JG	250	static void __exit ieee80211_crypto_deinit(void)
	251	{
	252	struct list_head ptr, n;
	253
	254	if (hcrypt == NULL)
	255	return;
	256
	257	for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
	258	ptr = n, n = ptr->next) {
	259	struct ieee80211_crypto_alg *alg =
0edd5b44	260	(struct ieee80211_crypto_alg *)ptr;
b453872c JG	261	list_del(ptr);
	262	printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
	263	"'%s' (deinit)\n", alg->ops->name);
	264	kfree(alg);
	265	}
	266
	267	kfree(hcrypt);
	268	}
	269
	270	EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
	271	EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
	272	EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
0ad0c3c6	273	EXPORT_SYMBOL(ieee80211_crypt_quiescing);
b453872c JG	274
	275	EXPORT_SYMBOL(ieee80211_register_crypto_ops);
	276	EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
	277	EXPORT_SYMBOL(ieee80211_get_crypto_ops);
	278
	279	module_init(ieee80211_crypto_init);
	280	module_exit(ieee80211_crypto_deinit);