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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(struct timer_list *t)
61{
62 struct ieee80211_device *ieee = from_timer(ieee, t, crypt_deinit_timer);
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))
84 return;
85
86 tmp = *crypt;
87 *crypt = NULL;
88
89
90
91
92
93
94 spin_lock_irqsave(&ieee->lock, flags);
95 list_add(&tmp->list, &ieee->crypt_deinit_list);
96 if (!timer_pending(&ieee->crypt_deinit_timer)) {
97 ieee->crypt_deinit_timer.expires = jiffies + HZ;
98 add_timer(&ieee->crypt_deinit_timer);
99 }
100 spin_unlock_irqrestore(&ieee->lock, flags);
101}
102
103int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
104{
105 unsigned long flags;
106 struct ieee80211_crypto_alg *alg;
107
108 if (!hcrypt)
109 return -1;
110
111 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
112 if (!alg)
113 return -ENOMEM;
114
115 alg->ops = ops;
116
117 spin_lock_irqsave(&hcrypt->lock, flags);
118 list_add(&alg->list, &hcrypt->algs);
119 spin_unlock_irqrestore(&hcrypt->lock, flags);
120
121 pr_debug("ieee80211_crypt: registered algorithm '%s'\n",
122 ops->name);
123
124 return 0;
125}
126
127int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
128{
129 unsigned long flags;
130 struct list_head *ptr;
131 struct ieee80211_crypto_alg *del_alg = NULL;
132
133 if (!hcrypt)
134 return -1;
135
136 spin_lock_irqsave(&hcrypt->lock, flags);
137 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
138 struct ieee80211_crypto_alg *alg =
139 (struct ieee80211_crypto_alg *)ptr;
140 if (alg->ops == ops) {
141 list_del(&alg->list);
142 del_alg = alg;
143 break;
144 }
145 }
146 spin_unlock_irqrestore(&hcrypt->lock, flags);
147
148 if (del_alg) {
149 pr_debug("ieee80211_crypt: unregistered algorithm '%s'\n",
150 ops->name);
151 kfree(del_alg);
152 }
153
154 return del_alg ? 0 : -1;
155}
156
157
158struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
159{
160 unsigned long flags;
161 struct list_head *ptr;
162 struct ieee80211_crypto_alg *found_alg = NULL;
163
164 if (!hcrypt)
165 return NULL;
166
167 spin_lock_irqsave(&hcrypt->lock, flags);
168 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
169 struct ieee80211_crypto_alg *alg =
170 (struct ieee80211_crypto_alg *)ptr;
171 if (strcmp(alg->ops->name, name) == 0) {
172 found_alg = alg;
173 break;
174 }
175 }
176 spin_unlock_irqrestore(&hcrypt->lock, flags);
177
178 if (found_alg)
179 return found_alg->ops;
180 return NULL;
181}
182
183
184static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
185static void ieee80211_crypt_null_deinit(void *priv) {}
186
187static struct ieee80211_crypto_ops ieee80211_crypt_null = {
188 .name = "NULL",
189 .init = ieee80211_crypt_null_init,
190 .deinit = ieee80211_crypt_null_deinit,
191 .encrypt_mpdu = NULL,
192 .decrypt_mpdu = NULL,
193 .encrypt_msdu = NULL,
194 .decrypt_msdu = NULL,
195 .set_key = NULL,
196 .get_key = NULL,
197 .extra_prefix_len = 0,
198 .extra_postfix_len = 0,
199 .owner = THIS_MODULE,
200};
201
202int __init ieee80211_crypto_init(void)
203{
204 int ret = -ENOMEM;
205
206 hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
207 if (!hcrypt)
208 goto out;
209
210 INIT_LIST_HEAD(&hcrypt->algs);
211 spin_lock_init(&hcrypt->lock);
212
213 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
214 if (ret < 0) {
215 kfree(hcrypt);
216 hcrypt = NULL;
217 }
218out:
219 return ret;
220}
221
222void __exit ieee80211_crypto_deinit(void)
223{
224 struct list_head *ptr, *n;
225
226 if (!hcrypt)
227 return;
228
229 for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
230 ptr = n, n = ptr->next) {
231 struct ieee80211_crypto_alg *alg =
232 (struct ieee80211_crypto_alg *)ptr;
233 list_del(ptr);
234 pr_debug("ieee80211_crypt: unregistered algorithm '%s' (deinit)\n",
235 alg->ops->name);
236 kfree(alg);
237 }
238
239 kfree(hcrypt);
240}
241
