1 /*
2 * Host AP crypto routines
3 *
4 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation. See README and COPYING for
10 * more details.
11 *
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 //#include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
22
23 #include "ieee80211.h"
24
25 MODULE_AUTHOR("Jouni Malinen");
26 MODULE_DESCRIPTION("HostAP crypto");
27 MODULE_LICENSE("GPL");
28
29 struct ieee80211_crypto_alg {
30 struct list_head list;
31 struct ieee80211_crypto_ops *ops;
32 };
33
34
35 struct ieee80211_crypto {
36 struct list_head algs;
37 spinlock_t lock;
38 };
39
40 static struct ieee80211_crypto *hcrypt;
41
ieee80211_crypt_deinit_entries(struct ieee80211_device * ieee,int force)42 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
43 int force)
44 {
45 struct list_head *ptr, *n;
46 struct ieee80211_crypt_data *entry;
47
48 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
49 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
50 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
51
52 if (atomic_read(&entry->refcnt) != 0 && !force)
53 continue;
54
55 list_del(ptr);
56
57 if (entry->ops)
58 entry->ops->deinit(entry->priv);
59 kfree(entry);
60 }
61 }
62
ieee80211_crypt_deinit_handler(unsigned long data)63 void ieee80211_crypt_deinit_handler(unsigned long data)
64 {
65 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
66 unsigned long flags;
67
68 spin_lock_irqsave(&ieee->lock, flags);
69 ieee80211_crypt_deinit_entries(ieee, 0);
70 if (!list_empty(&ieee->crypt_deinit_list)) {
71 pr_debug("entries remaining in delayed crypt deletion list\n");
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
ieee80211_crypt_delayed_deinit(struct ieee80211_device * ieee,struct ieee80211_crypt_data ** crypt)79 void 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 /* must not run ops->deinit() while there may be pending encrypt or
92 * decrypt operations. Use a list of delayed deinits to avoid needing
93 * locking. */
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
ieee80211_register_crypto_ops(struct ieee80211_crypto_ops * ops)104 int 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 = kzalloc(sizeof(*alg), GFP_KERNEL);
113 if (alg == NULL)
114 return -ENOMEM;
115
116 alg->ops = ops;
117
118 spin_lock_irqsave(&hcrypt->lock, flags);
119 list_add(&alg->list, &hcrypt->algs);
120 spin_unlock_irqrestore(&hcrypt->lock, flags);
121
122 pr_debug("registered algorithm '%s'\n", ops->name);
123
124 return 0;
125 }
126
ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops * ops)127 int 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 pr_debug("unregistered algorithm '%s'\n", ops->name);
150 kfree(del_alg);
151 }
152
153 return del_alg ? 0 : -1;
154 }
155
156
ieee80211_get_crypto_ops(const char * name)157 struct 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 else
180 return NULL;
181 }
182
183
ieee80211_crypt_null_init(int keyidx)184 static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
ieee80211_crypt_null_deinit(void * priv)185 static void ieee80211_crypt_null_deinit(void *priv) {}
186
187 static 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
202
ieee80211_crypto_init(void)203 int 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 }
219 out:
220 return ret;
221 }
222
223
ieee80211_crypto_deinit(void)224 void ieee80211_crypto_deinit(void)
225 {
226 struct list_head *ptr, *n;
227 struct ieee80211_crypto_alg *alg = NULL;
228
229 if (hcrypt == NULL)
230 return;
231
232 list_for_each_safe(ptr, n, &hcrypt->algs) {
233 alg = list_entry(ptr, struct ieee80211_crypto_alg, list);
234 if (alg) {
235 list_del(ptr);
236 pr_debug("unregistered algorithm '%s' (deinit)\n",
237 alg->ops->name);
238 kfree(alg);
239 }
240 }
241 kfree(hcrypt);
242 }
243