2 * Host AP crypto routines
4 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
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
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>
22 #include <net/ieee80211.h>
24 MODULE_AUTHOR("Jouni Malinen");
25 MODULE_DESCRIPTION("HostAP crypto");
26 MODULE_LICENSE("GPL");
28 struct ieee80211_crypto_alg {
29 struct list_head list;
30 struct ieee80211_crypto_ops *ops;
33 struct ieee80211_crypto {
34 struct list_head algs;
38 static struct ieee80211_crypto *hcrypt;
40 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
42 struct list_head *ptr, *n;
43 struct ieee80211_crypt_data *entry;
46 spin_lock_irqsave(&ieee->lock, flags);
47 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
48 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
49 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
51 if (atomic_read(&entry->refcnt) != 0 && !force)
57 entry->ops->deinit(entry->priv);
58 module_put(entry->ops->owner);
62 spin_unlock_irqrestore(&ieee->lock, flags);
65 void ieee80211_crypt_deinit_handler(unsigned long data)
67 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
69 ieee80211_crypt_deinit_entries(ieee, 0);
70 if (!list_empty(&ieee->crypt_deinit_list)) {
71 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
72 "deletion list\n", ieee->dev->name);
73 ieee->crypt_deinit_timer.expires = jiffies + HZ;
74 add_timer(&ieee->crypt_deinit_timer);
79 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
80 struct ieee80211_crypt_data **crypt)
82 struct ieee80211_crypt_data *tmp;
91 /* must not run ops->deinit() while there may be pending encrypt or
92 * decrypt operations. Use a list of delayed deinits to avoid needing
95 spin_lock_irqsave(&ieee->lock, flags);
96 list_add(&tmp->list, &ieee->crypt_deinit_list);
97 if (!timer_pending(&ieee->crypt_deinit_timer)) {
98 ieee->crypt_deinit_timer.expires = jiffies + HZ;
99 add_timer(&ieee->crypt_deinit_timer);
101 spin_unlock_irqrestore(&ieee->lock, flags);
104 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
107 struct ieee80211_crypto_alg *alg;
112 alg = kmalloc(sizeof(*alg), GFP_KERNEL);
116 memset(alg, 0, sizeof(*alg));
119 spin_lock_irqsave(&hcrypt->lock, flags);
120 list_add(&alg->list, &hcrypt->algs);
121 spin_unlock_irqrestore(&hcrypt->lock, flags);
123 printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
129 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
132 struct list_head *ptr;
133 struct ieee80211_crypto_alg *del_alg = NULL;
138 spin_lock_irqsave(&hcrypt->lock, flags);
139 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
140 struct ieee80211_crypto_alg *alg =
141 (struct ieee80211_crypto_alg *)ptr;
142 if (alg->ops == ops) {
143 list_del(&alg->list);
148 spin_unlock_irqrestore(&hcrypt->lock, flags);
151 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
152 "'%s'\n", ops->name);
156 return del_alg ? 0 : -1;
159 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
162 struct list_head *ptr;
163 struct ieee80211_crypto_alg *found_alg = NULL;
168 spin_lock_irqsave(&hcrypt->lock, flags);
169 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
170 struct ieee80211_crypto_alg *alg =
171 (struct ieee80211_crypto_alg *)ptr;
172 if (strcmp(alg->ops->name, name) == 0) {
177 spin_unlock_irqrestore(&hcrypt->lock, flags);
180 return found_alg->ops;
185 static void *ieee80211_crypt_null_init(struct ieee80211_device *ieee,
190 static void ieee80211_crypt_null_deinit(void *priv)
194 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
196 .init = ieee80211_crypt_null_init,
197 .deinit = ieee80211_crypt_null_deinit,
198 .encrypt_mpdu = NULL,
199 .decrypt_mpdu = NULL,
200 .encrypt_msdu = NULL,
201 .decrypt_msdu = NULL,
204 .extra_prefix_len = 0,
205 .extra_postfix_len = 0,
206 .owner = THIS_MODULE,
209 static int __init ieee80211_crypto_init(void)
213 hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
217 memset(hcrypt, 0, sizeof(*hcrypt));
218 INIT_LIST_HEAD(&hcrypt->algs);
219 spin_lock_init(&hcrypt->lock);
221 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
230 static void __exit ieee80211_crypto_deinit(void)
232 struct list_head *ptr, *n;
237 for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
238 ptr = n, n = ptr->next) {
239 struct ieee80211_crypto_alg *alg =
240 (struct ieee80211_crypto_alg *)ptr;
242 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
243 "'%s' (deinit)\n", alg->ops->name);
250 EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
251 EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
252 EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
254 EXPORT_SYMBOL(ieee80211_register_crypto_ops);
255 EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
256 EXPORT_SYMBOL(ieee80211_get_crypto_ops);
258 module_init(ieee80211_crypto_init);
259 module_exit(ieee80211_crypto_deinit);