1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <asm/string.h>
19#include <asm/errno.h>
20
21#include "ieee80211.h"
22
23MODULE_AUTHOR("Jouni Malinen");
24MODULE_DESCRIPTION("HostAP crypto");
25MODULE_LICENSE("GPL");
26
27struct ieee80211_crypto_alg {
28 struct list_head list;
29 struct ieee80211_crypto_ops *ops;
30};
31
32
33struct ieee80211_crypto {
34 struct list_head algs;
35 spinlock_t lock;
36};
37
38static struct ieee80211_crypto *hcrypt;
39
40void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
41 int force)
42{
43 struct list_head *ptr, *n;
44 struct ieee80211_crypt_data *entry;
45
46 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
47 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
48 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
49
50 if (atomic_read(&entry->refcnt) != 0 && !force)
51 continue;
52
53 list_del(ptr);
54
55 if (entry->ops)
56 entry->ops->deinit(entry->priv);
57 kfree(entry);
58 }
59}
60
61void ieee80211_crypt_deinit_handler(unsigned long data)
62{
63 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
64 unsigned long flags;
65
66 spin_lock_irqsave(&ieee->lock, flags);
67 ieee80211_crypt_deinit_entries(ieee, 0);
68 if (!list_empty(&ieee->crypt_deinit_list)) {
69 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
70 "deletion list\n", ieee->dev->name);
71 ieee->crypt_deinit_timer.expires = jiffies + HZ;
72 add_timer(&ieee->crypt_deinit_timer);
73 }
74 spin_unlock_irqrestore(&ieee->lock, flags);
75
76}
77
78void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
79 struct ieee80211_crypt_data **crypt)
80{
81 struct ieee80211_crypt_data *tmp;
82 unsigned long flags;
83
84 if (*crypt == NULL)
85 return;
86
87 tmp = *crypt;
88 *crypt = NULL;
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 == NULL)
109 return -1;
110
111 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
112 if (alg == NULL)
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 printk(KERN_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 == NULL)
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 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
150 "'%s'\n", 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 == NULL)
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 else
181 return NULL;
182}
183
184
185static void * ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
186static void ieee80211_crypt_null_deinit(void *priv) {}
187
188static struct ieee80211_crypto_ops ieee80211_crypt_null = {
189 .name = "NULL",
190 .init = ieee80211_crypt_null_init,
191 .deinit = ieee80211_crypt_null_deinit,
192 .encrypt_mpdu = NULL,
193 .decrypt_mpdu = NULL,
194 .encrypt_msdu = NULL,
195 .decrypt_msdu = NULL,
196 .set_key = NULL,
197 .get_key = NULL,
198 .extra_prefix_len = 0,
199 .extra_postfix_len = 0,
200 .owner = THIS_MODULE,
201};
202
203int __init ieee80211_crypto_init(void)
204{
205 int ret = -ENOMEM;
206
207 hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
208 if (!hcrypt)
209 goto out;
210
211 INIT_LIST_HEAD(&hcrypt->algs);
212 spin_lock_init(&hcrypt->lock);
213
214 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
215 if (ret < 0) {
216 kfree(hcrypt);
217 hcrypt = NULL;
218 }
219out:
220 return ret;
221}
222
223void __exit ieee80211_crypto_deinit(void)
224{
225 struct list_head *ptr, *n;
226
227 if (hcrypt == NULL)
228 return;
229
230 for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
231 ptr = n, n = ptr->next) {
232 struct ieee80211_crypto_alg *alg =
233 (struct ieee80211_crypto_alg *) ptr;
234 list_del(ptr);
235 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
236 "'%s' (deinit)\n", alg->ops->name);
237 kfree(alg);
238 }
239
240 kfree(hcrypt);
241}
242
