| /* |
| * 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_mpdu_prefix_len = 0, |
| .extra_mpdu_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); |