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/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
21 #include "ieee80211.h"
23 MODULE_AUTHOR("Jouni Malinen");
24 MODULE_DESCRIPTION("HostAP crypto");
25 MODULE_LICENSE("GPL");
27 struct ieee80211_crypto_alg
{
28 struct list_head list
;
29 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
,
43 struct list_head
*ptr
, *n
;
44 struct ieee80211_crypt_data
*entry
;
46 for (ptr
= ieee
->crypt_deinit_list
.next
, n
= ptr
->next
;
47 ptr
!= &ieee
->crypt_deinit_list
; ptr
= n
, n
= ptr
->next
) {
48 entry
= list_entry(ptr
, struct ieee80211_crypt_data
, list
);
50 if (atomic_read(&entry
->refcnt
) != 0 && !force
)
56 entry
->ops
->deinit(entry
->priv
);
61 void ieee80211_crypt_deinit_handler(unsigned long data
)
63 struct ieee80211_device
*ieee
= (struct ieee80211_device
*)data
;
66 spin_lock_irqsave(&ieee
->lock
, flags
);
67 ieee80211_crypt_deinit_entries(ieee
, 0);
68 if (!list_empty(&ieee
->crypt_deinit_list
)) {
69 printk(KERN_DEBUG
"%s: entries remaining in delayed crypt "
70 "deletion list\n", ieee
->dev
->name
);
71 ieee
->crypt_deinit_timer
.expires
= jiffies
+ HZ
;
72 add_timer(&ieee
->crypt_deinit_timer
);
74 spin_unlock_irqrestore(&ieee
->lock
, flags
);
78 void ieee80211_crypt_delayed_deinit(struct ieee80211_device
*ieee
,
79 struct ieee80211_crypt_data
**crypt
)
81 struct ieee80211_crypt_data
*tmp
;
90 /* must not run ops->deinit() while there may be pending encrypt or
91 * decrypt operations. Use a list of delayed deinits to avoid needing
94 spin_lock_irqsave(&ieee
->lock
, flags
);
95 list_add(&tmp
->list
, &ieee
->crypt_deinit_list
);
96 if (!timer_pending(&ieee
->crypt_deinit_timer
)) {
97 ieee
->crypt_deinit_timer
.expires
= jiffies
+ HZ
;
98 add_timer(&ieee
->crypt_deinit_timer
);
100 spin_unlock_irqrestore(&ieee
->lock
, flags
);
103 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops
*ops
)
106 struct ieee80211_crypto_alg
*alg
;
111 alg
= kzalloc(sizeof(*alg
), GFP_KERNEL
);
117 spin_lock_irqsave(&hcrypt
->lock
, flags
);
118 list_add(&alg
->list
, &hcrypt
->algs
);
119 spin_unlock_irqrestore(&hcrypt
->lock
, flags
);
121 printk(KERN_DEBUG
"ieee80211_crypt: registered algorithm '%s'\n",
127 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops
*ops
)
130 struct list_head
*ptr
;
131 struct ieee80211_crypto_alg
*del_alg
= NULL
;
136 spin_lock_irqsave(&hcrypt
->lock
, flags
);
137 for (ptr
= hcrypt
->algs
.next
; ptr
!= &hcrypt
->algs
; ptr
= ptr
->next
) {
138 struct ieee80211_crypto_alg
*alg
=
139 (struct ieee80211_crypto_alg
*) ptr
;
140 if (alg
->ops
== ops
) {
141 list_del(&alg
->list
);
146 spin_unlock_irqrestore(&hcrypt
->lock
, flags
);
149 printk(KERN_DEBUG
"ieee80211_crypt: unregistered algorithm "
150 "'%s'\n", ops
->name
);
154 return del_alg
? 0 : -1;
158 struct ieee80211_crypto_ops
*ieee80211_get_crypto_ops(const char *name
)
161 struct list_head
*ptr
;
162 struct ieee80211_crypto_alg
*found_alg
= NULL
;
167 spin_lock_irqsave(&hcrypt
->lock
, flags
);
168 for (ptr
= hcrypt
->algs
.next
; ptr
!= &hcrypt
->algs
; ptr
= ptr
->next
) {
169 struct ieee80211_crypto_alg
*alg
=
170 (struct ieee80211_crypto_alg
*) ptr
;
171 if (strcmp(alg
->ops
->name
, name
) == 0) {
176 spin_unlock_irqrestore(&hcrypt
->lock
, flags
);
179 return found_alg
->ops
;
185 static void *ieee80211_crypt_null_init(int keyidx
) { return (void *) 1; }
186 static void ieee80211_crypt_null_deinit(void *priv
) {}
188 static struct ieee80211_crypto_ops ieee80211_crypt_null
= {
190 .init
= ieee80211_crypt_null_init
,
191 .deinit
= ieee80211_crypt_null_deinit
,
192 .encrypt_mpdu
= NULL
,
193 .decrypt_mpdu
= NULL
,
194 .encrypt_msdu
= NULL
,
195 .decrypt_msdu
= NULL
,
198 .extra_prefix_len
= 0,
199 .extra_postfix_len
= 0,
200 .owner
= THIS_MODULE
,
203 int __init
ieee80211_crypto_init(void)
207 hcrypt
= kzalloc(sizeof(*hcrypt
), GFP_KERNEL
);
211 INIT_LIST_HEAD(&hcrypt
->algs
);
212 spin_lock_init(&hcrypt
->lock
);
214 ret
= ieee80211_register_crypto_ops(&ieee80211_crypt_null
);
223 void __exit
ieee80211_crypto_deinit(void)
225 struct list_head
*ptr
, *n
;
230 for (ptr
= hcrypt
->algs
.next
, n
= ptr
->next
; ptr
!= &hcrypt
->algs
;
231 ptr
= n
, n
= ptr
->next
) {
232 struct ieee80211_crypto_alg
*alg
=
233 (struct ieee80211_crypto_alg
*) ptr
;
235 printk(KERN_DEBUG
"ieee80211_crypt: unregistered algorithm "
236 "'%s' (deinit)\n", alg
->ops
->name
);