258 lines
6.6 KiB
C
258 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* lib80211 -- common bits for IEEE802.11 drivers
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*
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* Copyright(c) 2008 John W. Linville <linville@tuxdriver.com>
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*
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* Portions copied from old ieee80211 component, w/ original copyright
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* notices below:
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*
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* Host AP crypto routines
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*
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* Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
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* Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/ieee80211.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <net/lib80211.h>
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#define DRV_DESCRIPTION "common routines for IEEE802.11 drivers"
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MODULE_DESCRIPTION(DRV_DESCRIPTION);
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MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
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MODULE_LICENSE("GPL");
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struct lib80211_crypto_alg {
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struct list_head list;
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struct lib80211_crypto_ops *ops;
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};
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static LIST_HEAD(lib80211_crypto_algs);
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static DEFINE_SPINLOCK(lib80211_crypto_lock);
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static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info,
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int force);
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static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info);
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static void lib80211_crypt_deinit_handler(struct timer_list *t);
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int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
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spinlock_t *lock)
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{
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memset(info, 0, sizeof(*info));
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info->name = name;
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info->lock = lock;
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INIT_LIST_HEAD(&info->crypt_deinit_list);
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timer_setup(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler,
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0);
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return 0;
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}
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EXPORT_SYMBOL(lib80211_crypt_info_init);
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void lib80211_crypt_info_free(struct lib80211_crypt_info *info)
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{
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int i;
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lib80211_crypt_quiescing(info);
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del_timer_sync(&info->crypt_deinit_timer);
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lib80211_crypt_deinit_entries(info, 1);
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for (i = 0; i < NUM_WEP_KEYS; i++) {
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struct lib80211_crypt_data *crypt = info->crypt[i];
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if (crypt) {
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if (crypt->ops) {
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crypt->ops->deinit(crypt->priv);
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module_put(crypt->ops->owner);
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}
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kfree(crypt);
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info->crypt[i] = NULL;
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}
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}
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}
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EXPORT_SYMBOL(lib80211_crypt_info_free);
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static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info,
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int force)
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{
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struct lib80211_crypt_data *entry, *next;
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unsigned long flags;
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spin_lock_irqsave(info->lock, flags);
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list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) {
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if (atomic_read(&entry->refcnt) != 0 && !force)
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continue;
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list_del(&entry->list);
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if (entry->ops) {
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entry->ops->deinit(entry->priv);
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module_put(entry->ops->owner);
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}
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kfree(entry);
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}
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spin_unlock_irqrestore(info->lock, flags);
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}
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/* After this, crypt_deinit_list won't accept new members */
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static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info)
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{
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unsigned long flags;
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spin_lock_irqsave(info->lock, flags);
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info->crypt_quiesced = 1;
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spin_unlock_irqrestore(info->lock, flags);
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}
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static void lib80211_crypt_deinit_handler(struct timer_list *t)
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{
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struct lib80211_crypt_info *info = from_timer(info, t,
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crypt_deinit_timer);
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unsigned long flags;
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lib80211_crypt_deinit_entries(info, 0);
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spin_lock_irqsave(info->lock, flags);
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if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) {
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printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
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"deletion list\n", info->name);
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info->crypt_deinit_timer.expires = jiffies + HZ;
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add_timer(&info->crypt_deinit_timer);
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}
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spin_unlock_irqrestore(info->lock, flags);
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}
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void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
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struct lib80211_crypt_data **crypt)
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{
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struct lib80211_crypt_data *tmp;
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unsigned long flags;
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if (*crypt == NULL)
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return;
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tmp = *crypt;
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*crypt = NULL;
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/* must not run ops->deinit() while there may be pending encrypt or
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* decrypt operations. Use a list of delayed deinits to avoid needing
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* locking. */
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spin_lock_irqsave(info->lock, flags);
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if (!info->crypt_quiesced) {
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list_add(&tmp->list, &info->crypt_deinit_list);
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if (!timer_pending(&info->crypt_deinit_timer)) {
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info->crypt_deinit_timer.expires = jiffies + HZ;
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add_timer(&info->crypt_deinit_timer);
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}
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}
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spin_unlock_irqrestore(info->lock, flags);
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}
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EXPORT_SYMBOL(lib80211_crypt_delayed_deinit);
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int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops)
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{
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unsigned long flags;
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struct lib80211_crypto_alg *alg;
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alg = kzalloc(sizeof(*alg), GFP_KERNEL);
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if (alg == NULL)
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return -ENOMEM;
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alg->ops = ops;
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spin_lock_irqsave(&lib80211_crypto_lock, flags);
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list_add(&alg->list, &lib80211_crypto_algs);
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spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
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printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n",
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ops->name);
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return 0;
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}
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EXPORT_SYMBOL(lib80211_register_crypto_ops);
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int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
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{
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struct lib80211_crypto_alg *alg;
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unsigned long flags;
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spin_lock_irqsave(&lib80211_crypto_lock, flags);
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list_for_each_entry(alg, &lib80211_crypto_algs, list) {
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if (alg->ops == ops)
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goto found;
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}
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spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
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return -EINVAL;
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found:
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printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n",
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ops->name);
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list_del(&alg->list);
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spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
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kfree(alg);
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return 0;
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}
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EXPORT_SYMBOL(lib80211_unregister_crypto_ops);
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struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name)
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{
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struct lib80211_crypto_alg *alg;
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unsigned long flags;
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spin_lock_irqsave(&lib80211_crypto_lock, flags);
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list_for_each_entry(alg, &lib80211_crypto_algs, list) {
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if (strcmp(alg->ops->name, name) == 0)
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goto found;
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}
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spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
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return NULL;
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found:
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spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
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return alg->ops;
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}
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EXPORT_SYMBOL(lib80211_get_crypto_ops);
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static void *lib80211_crypt_null_init(int keyidx)
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{
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return (void *)1;
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}
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static void lib80211_crypt_null_deinit(void *priv)
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{
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}
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static struct lib80211_crypto_ops lib80211_crypt_null = {
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.name = "NULL",
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.init = lib80211_crypt_null_init,
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.deinit = lib80211_crypt_null_deinit,
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.owner = THIS_MODULE,
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};
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static int __init lib80211_init(void)
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{
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pr_info(DRV_DESCRIPTION "\n");
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return lib80211_register_crypto_ops(&lib80211_crypt_null);
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}
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static void __exit lib80211_exit(void)
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{
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lib80211_unregister_crypto_ops(&lib80211_crypt_null);
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BUG_ON(!list_empty(&lib80211_crypto_algs));
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}
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module_init(lib80211_init);
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module_exit(lib80211_exit);
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