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15#include <linux/version.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/slab.h>
19#include <asm/string.h>
20#include <asm/errno.h>
21
22#include "ieee80211.h"
23
24MODULE_AUTHOR("Jouni Malinen");
25MODULE_DESCRIPTION("HostAP crypto");
26MODULE_LICENSE("GPL");
27
28struct ieee80211_crypto_alg {
29 struct list_head list;
30 struct ieee80211_crypto_ops *ops;
31};
32
33
34struct ieee80211_crypto {
35 struct list_head algs;
36 spinlock_t lock;
37};
38
39static struct ieee80211_crypto *hcrypt;
40
41void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
42 int force)
43{
44 struct list_head *ptr, *n;
45 struct ieee80211_crypt_data *entry;
46
47 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
48 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
49 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
50
51 if (atomic_read(&entry->refcnt) != 0 && !force)
52 continue;
53
54 list_del(ptr);
55
56 if (entry->ops)
57 entry->ops->deinit(entry->priv);
58 kfree(entry);
59 }
60}
61
62void ieee80211_crypt_deinit_handler(unsigned long data)
63{
64 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
65 unsigned long flags;
66
67 spin_lock_irqsave(&ieee->lock, flags);
68 ieee80211_crypt_deinit_entries(ieee, 0);
69 if (!list_empty(&ieee->crypt_deinit_list)) {
70 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
71 "deletion list\n", ieee->dev->name);
72 ieee->crypt_deinit_timer.expires = jiffies + HZ;
73 add_timer(&ieee->crypt_deinit_timer);
74 }
75 spin_unlock_irqrestore(&ieee->lock, flags);
76
77}
78
79void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
80 struct ieee80211_crypt_data **crypt)
81{
82 struct ieee80211_crypt_data *tmp;
83 unsigned long flags;
84
85 if (*crypt == NULL)
86 return;
87
88 tmp = *crypt;
89 *crypt = NULL;
90
91
92
93
94
95 spin_lock_irqsave(&ieee->lock, flags);
96 list_add(&tmp->list, &ieee->crypt_deinit_list);
97 if (!timer_pending(&ieee->crypt_deinit_timer)) {
98 ieee->crypt_deinit_timer.expires = jiffies + HZ;
99 add_timer(&ieee->crypt_deinit_timer);
100 }
101 spin_unlock_irqrestore(&ieee->lock, flags);
102}
103
104int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
105{
106 unsigned long flags;
107 struct ieee80211_crypto_alg *alg;
108
109 if (hcrypt == NULL)
110 return -1;
111
112 alg = kmalloc(sizeof(*alg), GFP_KERNEL);
113 if (alg == NULL)
114 return -ENOMEM;
115
116 memset(alg, 0, sizeof(*alg));
117 alg->ops = ops;
118
119 spin_lock_irqsave(&hcrypt->lock, flags);
120 list_add(&alg->list, &hcrypt->algs);
121 spin_unlock_irqrestore(&hcrypt->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 unsigned long flags;
132 struct list_head *ptr;
133 struct ieee80211_crypto_alg *del_alg = NULL;
134
135 if (hcrypt == NULL)
136 return -1;
137
138 spin_lock_irqsave(&hcrypt->lock, flags);
139 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
140 struct ieee80211_crypto_alg *alg =
141 (struct ieee80211_crypto_alg *) ptr;
142 if (alg->ops == ops) {
143 list_del(&alg->list);
144 del_alg = alg;
145 break;
146 }
147 }
148 spin_unlock_irqrestore(&hcrypt->lock, flags);
149
150 if (del_alg) {
151 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
152 "'%s'\n", ops->name);
153 kfree(del_alg);
154 }
155
156 return del_alg ? 0 : -1;
157}
158
159
160struct ieee80211_crypto_ops * ieee80211_get_crypto_ops(const char *name)
161{
162 unsigned long flags;
163 struct list_head *ptr;
164 struct ieee80211_crypto_alg *found_alg = NULL;
165
166 if (hcrypt == NULL)
167 return NULL;
168
169 spin_lock_irqsave(&hcrypt->lock, flags);
170 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
171 struct ieee80211_crypto_alg *alg =
172 (struct ieee80211_crypto_alg *) ptr;
173 if (strcmp(alg->ops->name, name) == 0) {
174 found_alg = alg;
175 break;
176 }
177 }
178 spin_unlock_irqrestore(&hcrypt->lock, flags);
179
180 if (found_alg)
181 return found_alg->ops;
182 else
183 return NULL;
184}
185
186
187static void * ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
188static void ieee80211_crypt_null_deinit(void *priv) {}
189
190static struct ieee80211_crypto_ops ieee80211_crypt_null = {
191 .name = "NULL",
192 .init = ieee80211_crypt_null_init,
193 .deinit = ieee80211_crypt_null_deinit,
194 .encrypt_mpdu = NULL,
195 .decrypt_mpdu = NULL,
196 .encrypt_msdu = NULL,
197 .decrypt_msdu = NULL,
198 .set_key = NULL,
199 .get_key = NULL,
200 .extra_prefix_len = 0,
201 .extra_postfix_len = 0,
202 .owner = THIS_MODULE,
203};
204
205int __init ieee80211_crypto_init(void)
206{
207 int ret = -ENOMEM;
208
209 hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
210 if (!hcrypt)
211 goto out;
212
213 memset(hcrypt, 0, sizeof(*hcrypt));
214 INIT_LIST_HEAD(&hcrypt->algs);
215 spin_lock_init(&hcrypt->lock);
216
217 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
218 if (ret < 0) {
219 kfree(hcrypt);
220 hcrypt = NULL;
221 }
222out:
223 return ret;
224}
225
226void __exit ieee80211_crypto_deinit(void)
227{
228 struct list_head *ptr, *n;
229
230 if (hcrypt == NULL)
231 return;
232
233 for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
234 ptr = n, n = ptr->next) {
235 struct ieee80211_crypto_alg *alg =
236 (struct ieee80211_crypto_alg *) ptr;
237 list_del(ptr);
238 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
239 "'%s' (deinit)\n", alg->ops->name);
240 kfree(alg);
241 }
242
243 kfree(hcrypt);
244}
245
