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 "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
;
34 struct ieee80211_crypto
{
35 struct list_head algs
;
39 static struct ieee80211_crypto
*hcrypt
;
41 void ieee80211_crypt_deinit_entries(struct ieee80211_device
*ieee
,
44 struct list_head
*ptr
, *n
;
45 struct ieee80211_crypt_data
*entry
;
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
);
62 void ieee80211_crypt_deinit_handler(unsigned long data
)
64 struct ieee80211_device
*ieee
= (struct ieee80211_device
*)data
;
67 spin_lock_irqsave(&ieee
->lock
, flags
);
68 ieee80211_crypt_deinit_entries(ieee
, 0);
69 if (!list_empty(&ieee
->crypt_deinit_list
)) {
70 printk(KERN_DEBUG
"%s: entries remaining in delayed crypt "
71 "deletion list\n", ieee
->dev
->name
);
72 ieee
->crypt_deinit_timer
.expires
= jiffies
+ HZ
;
73 add_timer(&ieee
->crypt_deinit_timer
);
75 spin_unlock_irqrestore(&ieee
->lock
, flags
);
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
= kzalloc(sizeof(*alg
), GFP_KERNEL
);
118 spin_lock_irqsave(&hcrypt
->lock
, flags
);
119 list_add(&alg
->list
, &hcrypt
->algs
);
120 spin_unlock_irqrestore(&hcrypt
->lock
, flags
);
122 printk(KERN_DEBUG
"ieee80211_crypt: registered algorithm '%s'\n",
128 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops
*ops
)
131 struct list_head
*ptr
;
132 struct ieee80211_crypto_alg
*del_alg
= NULL
;
137 spin_lock_irqsave(&hcrypt
->lock
, flags
);
138 for (ptr
= hcrypt
->algs
.next
; ptr
!= &hcrypt
->algs
; ptr
= ptr
->next
) {
139 struct ieee80211_crypto_alg
*alg
=
140 (struct ieee80211_crypto_alg
*) ptr
;
141 if (alg
->ops
== ops
) {
142 list_del(&alg
->list
);
147 spin_unlock_irqrestore(&hcrypt
->lock
, flags
);
150 printk(KERN_DEBUG
"ieee80211_crypt: unregistered algorithm "
151 "'%s'\n", ops
->name
);
155 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
;
186 static void * ieee80211_crypt_null_init(int keyidx
) { return (void *) 1; }
187 static void ieee80211_crypt_null_deinit(void *priv
) {}
189 static struct ieee80211_crypto_ops ieee80211_crypt_null
= {
191 .init
= ieee80211_crypt_null_init
,
192 .deinit
= ieee80211_crypt_null_deinit
,
193 .encrypt_mpdu
= NULL
,
194 .decrypt_mpdu
= NULL
,
195 .encrypt_msdu
= NULL
,
196 .decrypt_msdu
= NULL
,
199 .extra_prefix_len
= 0,
200 .extra_postfix_len
= 0,
201 .owner
= THIS_MODULE
,
205 int __init
ieee80211_crypto_init(void)
209 hcrypt
= kzalloc(sizeof(*hcrypt
), GFP_KERNEL
);
213 INIT_LIST_HEAD(&hcrypt
->algs
);
214 spin_lock_init(&hcrypt
->lock
);
216 ret
= ieee80211_register_crypto_ops(&ieee80211_crypt_null
);
226 void ieee80211_crypto_deinit(void)
228 struct list_head
*ptr
, *n
;
233 for (ptr
= hcrypt
->algs
.next
, n
= ptr
->next
; ptr
!= &hcrypt
->algs
;
234 ptr
= n
, n
= ptr
->next
) {
235 struct ieee80211_crypto_alg
*alg
=
236 (struct ieee80211_crypto_alg
*) ptr
;
238 printk(KERN_DEBUG
"ieee80211_crypt: unregistered algorithm "
239 "'%s' (deinit)\n", alg
->ops
->name
);