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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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_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);
static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info,
int force);
static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info);
static void lib80211_crypt_deinit_handler(struct timer_list *t);
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);
timer_setup(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler,
0);
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);
static 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);
}
/* After this, crypt_deinit_list won't accept new members */
static 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);
}
static void lib80211_crypt_deinit_handler(struct timer_list *t)
{
struct lib80211_crypt_info *info = from_timer(info, t,
crypt_deinit_timer);
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);
}
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)
{
pr_info(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);
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