net/wireless/lib80211.c - kernel/prism - Git at Google

 /*
  * lib80211 -- common bits for IEEE802.11 drivers
  *
  * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com>
  *
  * Portions copied from old ieee80211 component, w/ original copyright
  * notices below:
  *
  * Host AP crypto routines
  *
  * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
  * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
  *
  */

 #include <linux/module.h>
 #include <linux/ctype.h>
 #include <linux/ieee80211.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/string.h>

 #include <net/lib80211.h>

 #define DRV_NAME        "lib80211"

 #define DRV_DESCRIPTION	"common routines for IEEE802.11 drivers"

 MODULE_DESCRIPTION(DRV_DESCRIPTION);
 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
 MODULE_LICENSE("GPL");

 struct lib80211_crypto_alg {
 	struct list_head list;
 	struct lib80211_crypto_ops *ops;
 };

 static LIST_HEAD(lib80211_crypto_algs);
 static DEFINE_SPINLOCK(lib80211_crypto_lock);

 const char *print_ssid(char *buf, const char *ssid, u8 ssid_len)
 {
 	const char *s = ssid;
 	char *d = buf;

 	ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN);
 	while (ssid_len--) {
 		if (isprint(*s)) {
 			*d++ = *s++;
 			continue;
 		}

 		*d++ = '\\';
 		if (*s == '\0')
 			*d++ = '0';
 		else if (*s == '\n')
 			*d++ = 'n';
 		else if (*s == '\r')
 			*d++ = 'r';
 		else if (*s == '\t')
 			*d++ = 't';
 		else if (*s == '\\')
 			*d++ = '\\';
 		else
 			d += snprintf(d, 3, "%03o", *s);
 		s++;
 	}
 	*d = '\0';
 	return buf;
 }
 EXPORT_SYMBOL(print_ssid);

 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 				spinlock_t *lock)
 {
 	memset(info, 0, sizeof(*info));

 	info->name = name;
 	info->lock = lock;

 	INIT_LIST_HEAD(&info->crypt_deinit_list);
 	setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler,
 			(unsigned long)info);

 	return 0;
 }
 EXPORT_SYMBOL(lib80211_crypt_info_init);

 void lib80211_crypt_info_free(struct lib80211_crypt_info *info)
 {
 	int i;

         lib80211_crypt_quiescing(info);
         del_timer_sync(&info->crypt_deinit_timer);
         lib80211_crypt_deinit_entries(info, 1);

         for (i = 0; i < NUM_WEP_KEYS; i++) {
                 struct lib80211_crypt_data *crypt = info->crypt[i];
                 if (crypt) {
                         if (crypt->ops) {
                                 crypt->ops->deinit(crypt->priv);
                                 module_put(crypt->ops->owner);
                         }
                         kfree(crypt);
                         info->crypt[i] = NULL;
                 }
         }
 }
 EXPORT_SYMBOL(lib80211_crypt_info_free);

 void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force)
 {
 	struct lib80211_crypt_data *entry, *next;
 	unsigned long flags;

 	spin_lock_irqsave(info->lock, flags);
 	list_for_each_entry_safe(entry, next, &info->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(info->lock, flags);
 }
 EXPORT_SYMBOL(lib80211_crypt_deinit_entries);

 /* After this, crypt_deinit_list won't accept new members */
 void lib80211_crypt_quiescing(struct lib80211_crypt_info *info)
 {
 	unsigned long flags;

 	spin_lock_irqsave(info->lock, flags);
 	info->crypt_quiesced = 1;
 	spin_unlock_irqrestore(info->lock, flags);
 }
 EXPORT_SYMBOL(lib80211_crypt_quiescing);

 void lib80211_crypt_deinit_handler(unsigned long data)
 {
 	struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data;
 	unsigned long flags;

 	lib80211_crypt_deinit_entries(info, 0);

 	spin_lock_irqsave(info->lock, flags);
 	if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) {
 		printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
 		       "deletion list\n", info->name);
 		info->crypt_deinit_timer.expires = jiffies + HZ;
 		add_timer(&info->crypt_deinit_timer);
 	}
 	spin_unlock_irqrestore(info->lock, flags);
 }
 EXPORT_SYMBOL(lib80211_crypt_deinit_handler);

 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
 				    struct lib80211_crypt_data **crypt)
 {
 	struct lib80211_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(info->lock, flags);
 	if (!info->crypt_quiesced) {
 		list_add(&tmp->list, &info->crypt_deinit_list);
 		if (!timer_pending(&info->crypt_deinit_timer)) {
 			info->crypt_deinit_timer.expires = jiffies + HZ;
 			add_timer(&info->crypt_deinit_timer);
 		}
 	}
 	spin_unlock_irqrestore(info->lock, flags);
 }
 EXPORT_SYMBOL(lib80211_crypt_delayed_deinit);

 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops)
 {
 	unsigned long flags;
 	struct lib80211_crypto_alg *alg;

 	alg = kzalloc(sizeof(*alg), GFP_KERNEL);
 	if (alg == NULL)
 		return -ENOMEM;

 	alg->ops = ops;

 	spin_lock_irqsave(&lib80211_crypto_lock, flags);
 	list_add(&alg->list, &lib80211_crypto_algs);
 	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);

 	printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n",
 	       ops->name);

 	return 0;
 }
 EXPORT_SYMBOL(lib80211_register_crypto_ops);

 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
 {
 	struct lib80211_crypto_alg *alg;
 	unsigned long flags;

 	spin_lock_irqsave(&lib80211_crypto_lock, flags);
 	list_for_each_entry(alg, &lib80211_crypto_algs, list) {
 		if (alg->ops == ops)
 			goto found;
 	}
 	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
 	return -EINVAL;

       found:
 	printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm "
 	       "'%s'\n", ops->name);
 	list_del(&alg->list);
 	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
 	kfree(alg);
 	return 0;
 }
 EXPORT_SYMBOL(lib80211_unregister_crypto_ops);

 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name)
 {
 	struct lib80211_crypto_alg *alg;
 	unsigned long flags;

 	spin_lock_irqsave(&lib80211_crypto_lock, flags);
 	list_for_each_entry(alg, &lib80211_crypto_algs, list) {
 		if (strcmp(alg->ops->name, name) == 0)
 			goto found;
 	}
 	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
 	return NULL;

       found:
 	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
 	return alg->ops;
 }
 EXPORT_SYMBOL(lib80211_get_crypto_ops);

 static void *lib80211_crypt_null_init(int keyidx)
 {
 	return (void *)1;
 }

 static void lib80211_crypt_null_deinit(void *priv)
 {
 }

 static struct lib80211_crypto_ops lib80211_crypt_null = {
 	.name = "NULL",
 	.init = lib80211_crypt_null_init,
 	.deinit = lib80211_crypt_null_deinit,
 	.owner = THIS_MODULE,
 };

 static int __init lib80211_init(void)
 {
 	printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION "\n");
 	return lib80211_register_crypto_ops(&lib80211_crypt_null);
 }

 static void __exit lib80211_exit(void)
 {
 	lib80211_unregister_crypto_ops(&lib80211_crypt_null);
 	BUG_ON(!list_empty(&lib80211_crypto_algs));
 }

 module_init(lib80211_init);
 module_exit(lib80211_exit);
	/*
	* lib80211 -- common bits for IEEE802.11 drivers
	*
	* Copyright(c) 2008 John W. Linville <linville@tuxdriver.com>
	*
	* Portions copied from old ieee80211 component, w/ original copyright
	* notices below:
	*
	* Host AP crypto routines
	*
	* Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
	* Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
	*
	*/

	#include <linux/module.h>
	#include <linux/ctype.h>
	#include <linux/ieee80211.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/string.h>

	#include <net/lib80211.h>

	#define DRV_NAME "lib80211"

	#define DRV_DESCRIPTION "common routines for IEEE802.11 drivers"

	MODULE_DESCRIPTION(DRV_DESCRIPTION);
	MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
	MODULE_LICENSE("GPL");

	struct lib80211_crypto_alg {
	struct list_head list;
	struct lib80211_crypto_ops *ops;
	};

	static LIST_HEAD(lib80211_crypto_algs);
	static DEFINE_SPINLOCK(lib80211_crypto_lock);

	const char print_ssid(char buf, const char *ssid, u8 ssid_len)
	{
	const char *s = ssid;
	char *d = buf;

	ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN);
	while (ssid_len--) {
	if (isprint(*s)) {
	d++ = s++;
	continue;
	}

	*d++ = '\\';
	if (*s == '\0')
	*d++ = '0';
	else if (*s == '\n')
	*d++ = 'n';
	else if (*s == '\r')
	*d++ = 'r';
	else if (*s == '\t')
	*d++ = 't';
	else if (*s == '\\')
	*d++ = '\\';
	else
	d += snprintf(d, 3, "%03o", *s);
	s++;
	}
	*d = '\0';
	return buf;
	}
	EXPORT_SYMBOL(print_ssid);

	int lib80211_crypt_info_init(struct lib80211_crypt_info info, char name,
	spinlock_t *lock)
	{
	memset(info, 0, sizeof(*info));

	info->name = name;
	info->lock = lock;

	INIT_LIST_HEAD(&info->crypt_deinit_list);
	setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler,
	(unsigned long)info);

	return 0;
	}
	EXPORT_SYMBOL(lib80211_crypt_info_init);

	void lib80211_crypt_info_free(struct lib80211_crypt_info *info)
	{
	int i;

	lib80211_crypt_quiescing(info);
	del_timer_sync(&info->crypt_deinit_timer);
	lib80211_crypt_deinit_entries(info, 1);

	for (i = 0; i < NUM_WEP_KEYS; i++) {
	struct lib80211_crypt_data *crypt = info->crypt[i];
	if (crypt) {
	if (crypt->ops) {
	crypt->ops->deinit(crypt->priv);
	module_put(crypt->ops->owner);
	}
	kfree(crypt);
	info->crypt[i] = NULL;
	}
	}
	}
	EXPORT_SYMBOL(lib80211_crypt_info_free);

	void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force)
	{
	struct lib80211_crypt_data entry, next;
	unsigned long flags;

	spin_lock_irqsave(info->lock, flags);
	list_for_each_entry_safe(entry, next, &info->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(info->lock, flags);
	}
	EXPORT_SYMBOL(lib80211_crypt_deinit_entries);

	/* After this, crypt_deinit_list won't accept new members */
	void lib80211_crypt_quiescing(struct lib80211_crypt_info *info)
	{
	unsigned long flags;

	spin_lock_irqsave(info->lock, flags);
	info->crypt_quiesced = 1;
	spin_unlock_irqrestore(info->lock, flags);
	}
	EXPORT_SYMBOL(lib80211_crypt_quiescing);

	void lib80211_crypt_deinit_handler(unsigned long data)
	{
	struct lib80211_crypt_info info = (struct lib80211_crypt_info )data;
	unsigned long flags;

	lib80211_crypt_deinit_entries(info, 0);

	spin_lock_irqsave(info->lock, flags);
	if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) {
	printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
	"deletion list\n", info->name);
	info->crypt_deinit_timer.expires = jiffies + HZ;
	add_timer(&info->crypt_deinit_timer);
	}
	spin_unlock_irqrestore(info->lock, flags);
	}
	EXPORT_SYMBOL(lib80211_crypt_deinit_handler);

	void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
	struct lib80211_crypt_data **crypt)
	{
	struct lib80211_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(info->lock, flags);
	if (!info->crypt_quiesced) {
	list_add(&tmp->list, &info->crypt_deinit_list);
	if (!timer_pending(&info->crypt_deinit_timer)) {
	info->crypt_deinit_timer.expires = jiffies + HZ;
	add_timer(&info->crypt_deinit_timer);
	}
	}
	spin_unlock_irqrestore(info->lock, flags);
	}
	EXPORT_SYMBOL(lib80211_crypt_delayed_deinit);

	int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops)
	{
	unsigned long flags;
	struct lib80211_crypto_alg *alg;

	alg = kzalloc(sizeof(*alg), GFP_KERNEL);
	if (alg == NULL)
	return -ENOMEM;

	alg->ops = ops;

	spin_lock_irqsave(&lib80211_crypto_lock, flags);
	list_add(&alg->list, &lib80211_crypto_algs);
	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);

	printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n",
	ops->name);

	return 0;
	}
	EXPORT_SYMBOL(lib80211_register_crypto_ops);

	int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
	{
	struct lib80211_crypto_alg *alg;
	unsigned long flags;

	spin_lock_irqsave(&lib80211_crypto_lock, flags);
	list_for_each_entry(alg, &lib80211_crypto_algs, list) {
	if (alg->ops == ops)
	goto found;
	}
	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
	return -EINVAL;

	found:
	printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm "
	"'%s'\n", ops->name);
	list_del(&alg->list);
	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
	kfree(alg);
	return 0;
	}
	EXPORT_SYMBOL(lib80211_unregister_crypto_ops);

	struct lib80211_crypto_ops lib80211_get_crypto_ops(const char name)
	{
	struct lib80211_crypto_alg *alg;
	unsigned long flags;

	spin_lock_irqsave(&lib80211_crypto_lock, flags);
	list_for_each_entry(alg, &lib80211_crypto_algs, list) {
	if (strcmp(alg->ops->name, name) == 0)
	goto found;
	}
	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
	return NULL;

	found:
	spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
	return alg->ops;
	}
	EXPORT_SYMBOL(lib80211_get_crypto_ops);

	static void *lib80211_crypt_null_init(int keyidx)
	{
	return (void *)1;
	}

	static void lib80211_crypt_null_deinit(void *priv)
	{
	}

	static struct lib80211_crypto_ops lib80211_crypt_null = {
	.name = "NULL",
	.init = lib80211_crypt_null_init,
	.deinit = lib80211_crypt_null_deinit,
	.owner = THIS_MODULE,
	};

	static int __init lib80211_init(void)
	{
	printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION "\n");
	return lib80211_register_crypto_ops(&lib80211_crypt_null);
	}

	static void __exit lib80211_exit(void)
	{
	lib80211_unregister_crypto_ops(&lib80211_crypt_null);
	BUG_ON(!list_empty(&lib80211_crypto_algs));
	}

	module_init(lib80211_init);
	module_exit(lib80211_exit);