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14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <net/ieee80211.h>
20
21MODULE_AUTHOR("Jouni Malinen");
22MODULE_DESCRIPTION("HostAP crypto");
23MODULE_LICENSE("GPL");
24
25struct ieee80211_crypto_alg {
26 struct list_head list;
27 struct ieee80211_crypto_ops *ops;
28};
29
30static LIST_HEAD(ieee80211_crypto_algs);
31static DEFINE_SPINLOCK(ieee80211_crypto_lock);
32
33void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
34{
35 struct ieee80211_crypt_data *entry, *next;
36 unsigned long flags;
37
38 spin_lock_irqsave(&ieee->lock, flags);
39 list_for_each_entry_safe(entry, next, &ieee->crypt_deinit_list, list) {
40 if (atomic_read(&entry->refcnt) != 0 && !force)
41 continue;
42
43 list_del(&entry->list);
44
45 if (entry->ops) {
46 entry->ops->deinit(entry->priv);
47 module_put(entry->ops->owner);
48 }
49 kfree(entry);
50 }
51 spin_unlock_irqrestore(&ieee->lock, flags);
52}
53
54
55void 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;
61 spin_unlock_irqrestore(&ieee->lock, flags);
62}
63
64void ieee80211_crypt_deinit_handler(unsigned long data)
65{
66 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
67 unsigned long flags;
68
69 ieee80211_crypt_deinit_entries(ieee, 0);
70
71 spin_lock_irqsave(&ieee->lock, flags);
72 if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) {
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 }
78 spin_unlock_irqrestore(&ieee->lock, flags);
79}
80
81void 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
94
95
96
97 spin_lock_irqsave(&ieee->lock, flags);
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 }
104 }
105 spin_unlock_irqrestore(&ieee->lock, flags);
106}
107
108int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
109{
110 unsigned long flags;
111 struct ieee80211_crypto_alg *alg;
112
113 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
114 if (alg == NULL)
115 return -ENOMEM;
116
117 alg->ops = ops;
118
119 spin_lock_irqsave(&ieee80211_crypto_lock, flags);
120 list_add(&alg->list, &ieee80211_crypto_algs);
121 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
122
123 printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
124 ops->name);
125
126 return 0;
127}
128
129int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
130{
131 struct ieee80211_crypto_alg *alg;
132 unsigned long flags;
133
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;
138 }
139 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
140 return -EINVAL;
141
142 found:
143 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
144 "'%s'\n", ops->name);
145 list_del(&alg->list);
146 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
147 kfree(alg);
148 return 0;
149}
150
151struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
152{
153 struct ieee80211_crypto_alg *alg;
154 unsigned long flags;
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;
160 }
161 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
162 return NULL;
163
164 found:
165 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
166 return alg->ops;
167}
168
169static void *ieee80211_crypt_null_init(int keyidx)
170{
171 return (void *)1;
172}
173
174static void ieee80211_crypt_null_deinit(void *priv)
175{
176}
177
178static struct ieee80211_crypto_ops ieee80211_crypt_null = {
179 .name = "NULL",
180 .init = ieee80211_crypt_null_init,
181 .deinit = ieee80211_crypt_null_deinit,
182 .owner = THIS_MODULE,
183};
184
185static int __init ieee80211_crypto_init(void)
186{
187 return ieee80211_register_crypto_ops(&ieee80211_crypt_null);
188}
189
190static void __exit ieee80211_crypto_deinit(void)
191{
192 ieee80211_unregister_crypto_ops(&ieee80211_crypt_null);
193 BUG_ON(!list_empty(&ieee80211_crypto_algs));
194}
195
196EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
197EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
198EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
199EXPORT_SYMBOL(ieee80211_crypt_quiescing);
200
201EXPORT_SYMBOL(ieee80211_register_crypto_ops);
202EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
203EXPORT_SYMBOL(ieee80211_get_crypto_ops);
204
205module_init(ieee80211_crypto_init);
206module_exit(ieee80211_crypto_deinit);
207
