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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20#include <linux/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, 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 pr_debug("entries remaining in delayed crypt deletion list\n");
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("registered algorithm '%s'\n", ops->name);
121
122 return 0;
123}
124
125int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
126{
127 unsigned long flags;
128 struct list_head *ptr;
129 struct ieee80211_crypto_alg *del_alg = NULL;
130
131 if (hcrypt == NULL)
132 return -1;
133
134 spin_lock_irqsave(&hcrypt->lock, flags);
135 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
136 struct ieee80211_crypto_alg *alg =
137 (struct ieee80211_crypto_alg *) ptr;
138 if (alg->ops == ops) {
139 list_del(&alg->list);
140 del_alg = alg;
141 break;
142 }
143 }
144 spin_unlock_irqrestore(&hcrypt->lock, flags);
145
146 if (del_alg) {
147 pr_debug("unregistered algorithm '%s'\n", ops->name);
148 kfree(del_alg);
149 }
150
151 return del_alg ? 0 : -1;
152}
153
154
155struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
156{
157 unsigned long flags;
158 struct list_head *ptr;
159 struct ieee80211_crypto_alg *found_alg = NULL;
160
161 if (hcrypt == NULL)
162 return NULL;
163
164 spin_lock_irqsave(&hcrypt->lock, flags);
165 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
166 struct ieee80211_crypto_alg *alg =
167 (struct ieee80211_crypto_alg *) ptr;
168 if (strcmp(alg->ops->name, name) == 0) {
169 found_alg = alg;
170 break;
171 }
172 }
173 spin_unlock_irqrestore(&hcrypt->lock, flags);
174
175 if (found_alg)
176 return found_alg->ops;
177 else
178 return NULL;
179}
180
181
182static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
183static void ieee80211_crypt_null_deinit(void *priv) {}
184
185static struct ieee80211_crypto_ops ieee80211_crypt_null = {
186 .name = "NULL",
187 .init = ieee80211_crypt_null_init,
188 .deinit = ieee80211_crypt_null_deinit,
189 .encrypt_mpdu = NULL,
190 .decrypt_mpdu = NULL,
191 .encrypt_msdu = NULL,
192 .decrypt_msdu = NULL,
193 .set_key = NULL,
194 .get_key = NULL,
195 .extra_prefix_len = 0,
196 .extra_postfix_len = 0,
197 .owner = THIS_MODULE,
198};
199
200
201int 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
221
222void ieee80211_crypto_deinit(void)
223{
224 struct list_head *ptr, *n;
225 struct ieee80211_crypto_alg *alg = NULL;
226
227 if (hcrypt == NULL)
228 return;
229
230 list_for_each_safe(ptr, n, &hcrypt->algs) {
231 alg = list_entry(ptr, struct ieee80211_crypto_alg, list);
232 if (alg) {
233 list_del(ptr);
234 pr_debug("unregistered algorithm '%s' (deinit)\n",
235 alg->ops->name);
236 kfree(alg);
237 }
238 }
239 kfree(hcrypt);
240}
241
