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14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19
20#include "ieee80211.h"
21
22MODULE_AUTHOR("Jouni Malinen");
23MODULE_DESCRIPTION("HostAP crypto");
24MODULE_LICENSE("GPL");
25
26struct ieee80211_crypto_alg {
27 struct list_head list;
28 struct ieee80211_crypto_ops *ops;
29};
30
31
32struct ieee80211_crypto {
33 struct list_head algs;
34 spinlock_t lock;
35};
36
37static struct ieee80211_crypto *hcrypt;
38
39void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
40 int force)
41{
42 struct list_head *ptr, *n;
43 struct ieee80211_crypt_data *entry;
44
45 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
46 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
47 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
48
49 if (atomic_read(&entry->refcnt) != 0 && !force)
50 continue;
51
52 list_del(ptr);
53
54 if (entry->ops)
55 entry->ops->deinit(entry->priv);
56 kfree(entry);
57 }
58}
59
60void ieee80211_crypt_deinit_handler(unsigned long data)
61{
62 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
63 unsigned long flags;
64
65 spin_lock_irqsave(&ieee->lock, flags);
66 ieee80211_crypt_deinit_entries(ieee, 0);
67 if (!list_empty(&ieee->crypt_deinit_list)) {
68 netdev_dbg(ieee->dev, "%s: entries remaining in delayed crypt deletion list\n",
69 ieee->dev->name);
70 ieee->crypt_deinit_timer.expires = jiffies + HZ;
71 add_timer(&ieee->crypt_deinit_timer);
72 }
73 spin_unlock_irqrestore(&ieee->lock, flags);
74
75}
76
77void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
78 struct ieee80211_crypt_data **crypt)
79{
80 struct ieee80211_crypt_data *tmp;
81 unsigned long flags;
82
83 if (*crypt == NULL)
84 return;
85
86 tmp = *crypt;
87 *crypt = NULL;
88
89
90
91
92
93 spin_lock_irqsave(&ieee->lock, flags);
94 list_add(&tmp->list, &ieee->crypt_deinit_list);
95 if (!timer_pending(&ieee->crypt_deinit_timer)) {
96 ieee->crypt_deinit_timer.expires = jiffies + HZ;
97 add_timer(&ieee->crypt_deinit_timer);
98 }
99 spin_unlock_irqrestore(&ieee->lock, flags);
100}
101
102int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
103{
104 unsigned long flags;
105 struct ieee80211_crypto_alg *alg;
106
107 if (hcrypt == NULL)
108 return -1;
109
110 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
111 if (alg == NULL)
112 return -ENOMEM;
113
114 alg->ops = ops;
115
116 spin_lock_irqsave(&hcrypt->lock, flags);
117 list_add(&alg->list, &hcrypt->algs);
118 spin_unlock_irqrestore(&hcrypt->lock, flags);
119
120 pr_debug("ieee80211_crypt: registered algorithm '%s'\n",
121 ops->name);
122
123 return 0;
124}
125
126int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
127{
128 unsigned long flags;
129 struct list_head *ptr;
130 struct ieee80211_crypto_alg *del_alg = NULL;
131
132 if (hcrypt == NULL)
133 return -1;
134
135 spin_lock_irqsave(&hcrypt->lock, flags);
136 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
137 struct ieee80211_crypto_alg *alg =
138 (struct ieee80211_crypto_alg *) ptr;
139 if (alg->ops == ops) {
140 list_del(&alg->list);
141 del_alg = alg;
142 break;
143 }
144 }
145 spin_unlock_irqrestore(&hcrypt->lock, flags);
146
147 if (del_alg) {
148 pr_debug("ieee80211_crypt: unregistered algorithm '%s'\n",
149 ops->name);
150 kfree(del_alg);
151 }
152
153 return del_alg ? 0 : -1;
154}
155
156
157struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
158{
159 unsigned long flags;
160 struct list_head *ptr;
161 struct ieee80211_crypto_alg *found_alg = NULL;
162
163 if (hcrypt == NULL)
164 return NULL;
165
166 spin_lock_irqsave(&hcrypt->lock, flags);
167 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
168 struct ieee80211_crypto_alg *alg =
169 (struct ieee80211_crypto_alg *) ptr;
170 if (strcmp(alg->ops->name, name) == 0) {
171 found_alg = alg;
172 break;
173 }
174 }
175 spin_unlock_irqrestore(&hcrypt->lock, flags);
176
177 if (found_alg)
178 return found_alg->ops;
179 return NULL;
180}
181
182
183static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
184static void ieee80211_crypt_null_deinit(void *priv) {}
185
186static struct ieee80211_crypto_ops ieee80211_crypt_null = {
187 .name = "NULL",
188 .init = ieee80211_crypt_null_init,
189 .deinit = ieee80211_crypt_null_deinit,
190 .encrypt_mpdu = NULL,
191 .decrypt_mpdu = NULL,
192 .encrypt_msdu = NULL,
193 .decrypt_msdu = NULL,
194 .set_key = NULL,
195 .get_key = NULL,
196 .extra_prefix_len = 0,
197 .extra_postfix_len = 0,
198 .owner = THIS_MODULE,
199};
200
201int __init ieee80211_crypto_init(void)
202{
203 int ret = -ENOMEM;
204
205 hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
206 if (!hcrypt)
207 goto out;
208
209 INIT_LIST_HEAD(&hcrypt->algs);
210 spin_lock_init(&hcrypt->lock);
211
212 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
213 if (ret < 0) {
214 kfree(hcrypt);
215 hcrypt = NULL;
216 }
217out:
218 return ret;
219}
220
221void __exit ieee80211_crypto_deinit(void)
222{
223 struct list_head *ptr, *n;
224
225 if (hcrypt == NULL)
226 return;
227
228 for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
229 ptr = n, n = ptr->next) {
230 struct ieee80211_crypto_alg *alg =
231 (struct ieee80211_crypto_alg *) ptr;
232 list_del(ptr);
233 pr_debug("ieee80211_crypt: unregistered algorithm '%s' (deinit)\n",
234 alg->ops->name);
235 kfree(alg);
236 }
237
238 kfree(hcrypt);
239}
240
