1 // SPDX-License-Identifier: GPL-2.0-only
3 * lib80211 -- common bits for IEEE802.11 drivers
5 * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com>
7 * Portions copied from old ieee80211 component, w/ original copyright
10 * Host AP crypto routines
12 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
13 * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 #include <linux/module.h>
20 #include <linux/ctype.h>
21 #include <linux/ieee80211.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/string.h>
27 #include <net/lib80211.h>
29 #define DRV_NAME "lib80211"
31 #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers"
33 MODULE_DESCRIPTION(DRV_DESCRIPTION
);
34 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
35 MODULE_LICENSE("GPL");
37 struct lib80211_crypto_alg
{
38 struct list_head list
;
39 struct lib80211_crypto_ops
*ops
;
42 static LIST_HEAD(lib80211_crypto_algs
);
43 static DEFINE_SPINLOCK(lib80211_crypto_lock
);
45 static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info
*info
,
47 static void lib80211_crypt_quiescing(struct lib80211_crypt_info
*info
);
48 static void lib80211_crypt_deinit_handler(struct timer_list
*t
);
50 int lib80211_crypt_info_init(struct lib80211_crypt_info
*info
, char *name
,
53 memset(info
, 0, sizeof(*info
));
58 INIT_LIST_HEAD(&info
->crypt_deinit_list
);
59 timer_setup(&info
->crypt_deinit_timer
, lib80211_crypt_deinit_handler
,
64 EXPORT_SYMBOL(lib80211_crypt_info_init
);
66 void lib80211_crypt_info_free(struct lib80211_crypt_info
*info
)
70 lib80211_crypt_quiescing(info
);
71 del_timer_sync(&info
->crypt_deinit_timer
);
72 lib80211_crypt_deinit_entries(info
, 1);
74 for (i
= 0; i
< NUM_WEP_KEYS
; i
++) {
75 struct lib80211_crypt_data
*crypt
= info
->crypt
[i
];
78 crypt
->ops
->deinit(crypt
->priv
);
79 module_put(crypt
->ops
->owner
);
82 info
->crypt
[i
] = NULL
;
86 EXPORT_SYMBOL(lib80211_crypt_info_free
);
88 static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info
*info
,
91 struct lib80211_crypt_data
*entry
, *next
;
94 spin_lock_irqsave(info
->lock
, flags
);
95 list_for_each_entry_safe(entry
, next
, &info
->crypt_deinit_list
, list
) {
96 if (atomic_read(&entry
->refcnt
) != 0 && !force
)
99 list_del(&entry
->list
);
102 entry
->ops
->deinit(entry
->priv
);
103 module_put(entry
->ops
->owner
);
107 spin_unlock_irqrestore(info
->lock
, flags
);
110 /* After this, crypt_deinit_list won't accept new members */
111 static void lib80211_crypt_quiescing(struct lib80211_crypt_info
*info
)
115 spin_lock_irqsave(info
->lock
, flags
);
116 info
->crypt_quiesced
= 1;
117 spin_unlock_irqrestore(info
->lock
, flags
);
120 static void lib80211_crypt_deinit_handler(struct timer_list
*t
)
122 struct lib80211_crypt_info
*info
= from_timer(info
, t
,
126 lib80211_crypt_deinit_entries(info
, 0);
128 spin_lock_irqsave(info
->lock
, flags
);
129 if (!list_empty(&info
->crypt_deinit_list
) && !info
->crypt_quiesced
) {
130 printk(KERN_DEBUG
"%s: entries remaining in delayed crypt "
131 "deletion list\n", info
->name
);
132 info
->crypt_deinit_timer
.expires
= jiffies
+ HZ
;
133 add_timer(&info
->crypt_deinit_timer
);
135 spin_unlock_irqrestore(info
->lock
, flags
);
138 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info
*info
,
139 struct lib80211_crypt_data
**crypt
)
141 struct lib80211_crypt_data
*tmp
;
150 /* must not run ops->deinit() while there may be pending encrypt or
151 * decrypt operations. Use a list of delayed deinits to avoid needing
154 spin_lock_irqsave(info
->lock
, flags
);
155 if (!info
->crypt_quiesced
) {
156 list_add(&tmp
->list
, &info
->crypt_deinit_list
);
157 if (!timer_pending(&info
->crypt_deinit_timer
)) {
158 info
->crypt_deinit_timer
.expires
= jiffies
+ HZ
;
159 add_timer(&info
->crypt_deinit_timer
);
162 spin_unlock_irqrestore(info
->lock
, flags
);
164 EXPORT_SYMBOL(lib80211_crypt_delayed_deinit
);
166 int lib80211_register_crypto_ops(struct lib80211_crypto_ops
*ops
)
169 struct lib80211_crypto_alg
*alg
;
171 alg
= kzalloc(sizeof(*alg
), GFP_KERNEL
);
177 spin_lock_irqsave(&lib80211_crypto_lock
, flags
);
178 list_add(&alg
->list
, &lib80211_crypto_algs
);
179 spin_unlock_irqrestore(&lib80211_crypto_lock
, flags
);
181 printk(KERN_DEBUG
"lib80211_crypt: registered algorithm '%s'\n",
186 EXPORT_SYMBOL(lib80211_register_crypto_ops
);
188 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops
*ops
)
190 struct lib80211_crypto_alg
*alg
;
193 spin_lock_irqsave(&lib80211_crypto_lock
, flags
);
194 list_for_each_entry(alg
, &lib80211_crypto_algs
, list
) {
198 spin_unlock_irqrestore(&lib80211_crypto_lock
, flags
);
202 printk(KERN_DEBUG
"lib80211_crypt: unregistered algorithm '%s'\n",
204 list_del(&alg
->list
);
205 spin_unlock_irqrestore(&lib80211_crypto_lock
, flags
);
209 EXPORT_SYMBOL(lib80211_unregister_crypto_ops
);
211 struct lib80211_crypto_ops
*lib80211_get_crypto_ops(const char *name
)
213 struct lib80211_crypto_alg
*alg
;
216 spin_lock_irqsave(&lib80211_crypto_lock
, flags
);
217 list_for_each_entry(alg
, &lib80211_crypto_algs
, list
) {
218 if (strcmp(alg
->ops
->name
, name
) == 0)
221 spin_unlock_irqrestore(&lib80211_crypto_lock
, flags
);
225 spin_unlock_irqrestore(&lib80211_crypto_lock
, flags
);
228 EXPORT_SYMBOL(lib80211_get_crypto_ops
);
230 static void *lib80211_crypt_null_init(int keyidx
)
235 static void lib80211_crypt_null_deinit(void *priv
)
239 static struct lib80211_crypto_ops lib80211_crypt_null
= {
241 .init
= lib80211_crypt_null_init
,
242 .deinit
= lib80211_crypt_null_deinit
,
243 .owner
= THIS_MODULE
,
246 static int __init
lib80211_init(void)
248 pr_info(DRV_DESCRIPTION
"\n");
249 return lib80211_register_crypto_ops(&lib80211_crypt_null
);
252 static void __exit
lib80211_exit(void)
254 lib80211_unregister_crypto_ops(&lib80211_crypt_null
);
255 BUG_ON(!list_empty(&lib80211_crypto_algs
));
258 module_init(lib80211_init
);
259 module_exit(lib80211_exit
);