Commit | Line | Data |
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b453872c JG |
1 | /* |
2 | * Host AP crypto routines | |
3 | * | |
85d32e7b | 4 | * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi> |
b453872c JG |
5 | * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com> |
6 | * | |
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 | |
10 | * more details. | |
11 | * | |
12 | */ | |
13 | ||
e3305626 | 14 | #include <linux/errno.h> |
b453872c JG |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
e3305626 | 18 | #include <linux/string.h> |
b453872c JG |
19 | #include <net/ieee80211.h> |
20 | ||
21 | MODULE_AUTHOR("Jouni Malinen"); | |
22 | MODULE_DESCRIPTION("HostAP crypto"); | |
23 | MODULE_LICENSE("GPL"); | |
24 | ||
25 | struct ieee80211_crypto_alg { | |
26 | struct list_head list; | |
27 | struct ieee80211_crypto_ops *ops; | |
28 | }; | |
29 | ||
e3305626 CH |
30 | static LIST_HEAD(ieee80211_crypto_algs); |
31 | static DEFINE_SPINLOCK(ieee80211_crypto_lock); | |
b453872c | 32 | |
0edd5b44 | 33 | void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force) |
b453872c | 34 | { |
d6529237 | 35 | struct ieee80211_crypt_data *entry, *next; |
20d64713 | 36 | unsigned long flags; |
b453872c | 37 | |
20d64713 | 38 | spin_lock_irqsave(&ieee->lock, flags); |
d6529237 | 39 | list_for_each_entry_safe(entry, next, &ieee->crypt_deinit_list, list) { |
b453872c JG |
40 | if (atomic_read(&entry->refcnt) != 0 && !force) |
41 | continue; | |
42 | ||
e3305626 | 43 | list_del(&entry->list); |
b453872c JG |
44 | |
45 | if (entry->ops) { | |
46 | entry->ops->deinit(entry->priv); | |
47 | module_put(entry->ops->owner); | |
48 | } | |
49 | kfree(entry); | |
50 | } | |
0ad0c3c6 JK |
51 | spin_unlock_irqrestore(&ieee->lock, flags); |
52 | } | |
53 | ||
54 | /* After this, crypt_deinit_list won't accept new members */ | |
55 | void ieee80211_crypt_quiescing(struct ieee80211_device *ieee) | |
56 | { | |
57 | unsigned long flags; | |
58 | ||
59 | spin_lock_irqsave(&ieee->lock, flags); | |
60 | ieee->crypt_quiesced = 1; | |
20d64713 | 61 | spin_unlock_irqrestore(&ieee->lock, flags); |
b453872c JG |
62 | } |
63 | ||
64 | void ieee80211_crypt_deinit_handler(unsigned long data) | |
65 | { | |
66 | struct ieee80211_device *ieee = (struct ieee80211_device *)data; | |
0ad0c3c6 | 67 | unsigned long flags; |
b453872c | 68 | |
b453872c | 69 | ieee80211_crypt_deinit_entries(ieee, 0); |
0ad0c3c6 JK |
70 | |
71 | spin_lock_irqsave(&ieee->lock, flags); | |
72 | if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) { | |
b453872c JG |
73 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " |
74 | "deletion list\n", ieee->dev->name); | |
75 | ieee->crypt_deinit_timer.expires = jiffies + HZ; | |
76 | add_timer(&ieee->crypt_deinit_timer); | |
77 | } | |
0ad0c3c6 | 78 | spin_unlock_irqrestore(&ieee->lock, flags); |
b453872c JG |
79 | } |
80 | ||
81 | void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee, | |
82 | struct ieee80211_crypt_data **crypt) | |
83 | { | |
84 | struct ieee80211_crypt_data *tmp; | |
85 | unsigned long flags; | |
86 | ||
87 | if (*crypt == NULL) | |
88 | return; | |
89 | ||
90 | tmp = *crypt; | |
91 | *crypt = NULL; | |
92 | ||
93 | /* must not run ops->deinit() while there may be pending encrypt or | |
94 | * decrypt operations. Use a list of delayed deinits to avoid needing | |
95 | * locking. */ | |
96 | ||
97 | spin_lock_irqsave(&ieee->lock, flags); | |
0ad0c3c6 JK |
98 | if (!ieee->crypt_quiesced) { |
99 | list_add(&tmp->list, &ieee->crypt_deinit_list); | |
100 | if (!timer_pending(&ieee->crypt_deinit_timer)) { | |
101 | ieee->crypt_deinit_timer.expires = jiffies + HZ; | |
102 | add_timer(&ieee->crypt_deinit_timer); | |
103 | } | |
b453872c JG |
104 | } |
105 | spin_unlock_irqrestore(&ieee->lock, flags); | |
106 | } | |
107 | ||
108 | int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops) | |
109 | { | |
110 | unsigned long flags; | |
111 | struct ieee80211_crypto_alg *alg; | |
112 | ||
0da974f4 | 113 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
b453872c JG |
114 | if (alg == NULL) |
115 | return -ENOMEM; | |
116 | ||
b453872c JG |
117 | alg->ops = ops; |
118 | ||
e3305626 CH |
119 | spin_lock_irqsave(&ieee80211_crypto_lock, flags); |
120 | list_add(&alg->list, &ieee80211_crypto_algs); | |
121 | spin_unlock_irqrestore(&ieee80211_crypto_lock, flags); | |
b453872c JG |
122 | |
123 | printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n", | |
124 | ops->name); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops) | |
130 | { | |
e3305626 | 131 | struct ieee80211_crypto_alg *alg; |
b453872c | 132 | unsigned long flags; |
b453872c | 133 | |
e3305626 CH |
134 | spin_lock_irqsave(&ieee80211_crypto_lock, flags); |
135 | list_for_each_entry(alg, &ieee80211_crypto_algs, list) { | |
136 | if (alg->ops == ops) | |
137 | goto found; | |
b453872c | 138 | } |
e3305626 CH |
139 | spin_unlock_irqrestore(&ieee80211_crypto_lock, flags); |
140 | return -EINVAL; | |
141 | ||
d6529237 | 142 | found: |
e3305626 | 143 | printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm " |
d6529237 | 144 | "'%s'\n", ops->name); |
e3305626 CH |
145 | list_del(&alg->list); |
146 | spin_unlock_irqrestore(&ieee80211_crypto_lock, flags); | |
147 | kfree(alg); | |
148 | return 0; | |
b453872c JG |
149 | } |
150 | ||
0edd5b44 | 151 | struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name) |
b453872c | 152 | { |
e3305626 | 153 | struct ieee80211_crypto_alg *alg; |
b453872c | 154 | unsigned long flags; |
e3305626 CH |
155 | |
156 | spin_lock_irqsave(&ieee80211_crypto_lock, flags); | |
157 | list_for_each_entry(alg, &ieee80211_crypto_algs, list) { | |
158 | if (strcmp(alg->ops->name, name) == 0) | |
159 | goto found; | |
b453872c | 160 | } |
e3305626 CH |
161 | spin_unlock_irqrestore(&ieee80211_crypto_lock, flags); |
162 | return NULL; | |
b453872c | 163 | |
d6529237 | 164 | found: |
e3305626 CH |
165 | spin_unlock_irqrestore(&ieee80211_crypto_lock, flags); |
166 | return alg->ops; | |
b453872c JG |
167 | } |
168 | ||
6eb6edf0 | 169 | static void *ieee80211_crypt_null_init(int keyidx) |
0edd5b44 JG |
170 | { |
171 | return (void *)1; | |
172 | } | |
e3305626 | 173 | |
0edd5b44 JG |
174 | static void ieee80211_crypt_null_deinit(void *priv) |
175 | { | |
176 | } | |
b453872c JG |
177 | |
178 | static struct ieee80211_crypto_ops ieee80211_crypt_null = { | |
74079fdc JK |
179 | .name = "NULL", |
180 | .init = ieee80211_crypt_null_init, | |
181 | .deinit = ieee80211_crypt_null_deinit, | |
74079fdc | 182 | .owner = THIS_MODULE, |
b453872c JG |
183 | }; |
184 | ||
b453872c JG |
185 | static int __init ieee80211_crypto_init(void) |
186 | { | |
e3305626 | 187 | return ieee80211_register_crypto_ops(&ieee80211_crypt_null); |
b453872c JG |
188 | } |
189 | ||
b453872c JG |
190 | static void __exit ieee80211_crypto_deinit(void) |
191 | { | |
e3305626 CH |
192 | ieee80211_unregister_crypto_ops(&ieee80211_crypt_null); |
193 | BUG_ON(!list_empty(&ieee80211_crypto_algs)); | |
b453872c JG |
194 | } |
195 | ||
196 | EXPORT_SYMBOL(ieee80211_crypt_deinit_entries); | |
197 | EXPORT_SYMBOL(ieee80211_crypt_deinit_handler); | |
198 | EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit); | |
0ad0c3c6 | 199 | EXPORT_SYMBOL(ieee80211_crypt_quiescing); |
b453872c JG |
200 | |
201 | EXPORT_SYMBOL(ieee80211_register_crypto_ops); | |
202 | EXPORT_SYMBOL(ieee80211_unregister_crypto_ops); | |
203 | EXPORT_SYMBOL(ieee80211_get_crypto_ops); | |
204 | ||
205 | module_init(ieee80211_crypto_init); | |
206 | module_exit(ieee80211_crypto_deinit); |