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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#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 "rtllib.h"
21
22struct rtllib_crypto_alg {
23 struct list_head list;
24 struct lib80211_crypto_ops *ops;
25};
26
27
28struct rtllib_crypto {
29 struct list_head algs;
30 spinlock_t lock;
31};
32
33static struct rtllib_crypto *hcrypt;
34
35void rtllib_crypt_deinit_entries(struct lib80211_crypt_info *info,
36 int force)
37{
38 struct list_head *ptr, *n;
39 struct lib80211_crypt_data *entry;
40
41 for (ptr = info->crypt_deinit_list.next, n = ptr->next;
42 ptr != &info->crypt_deinit_list; ptr = n, n = ptr->next) {
43 entry = list_entry(ptr, struct lib80211_crypt_data, list);
44
45 if (atomic_read(&entry->refcnt) != 0 && !force)
46 continue;
47
48 list_del(ptr);
49
50 if (entry->ops)
51 entry->ops->deinit(entry->priv);
52 kfree(entry);
53 }
54}
55EXPORT_SYMBOL(rtllib_crypt_deinit_entries);
56
57void rtllib_crypt_deinit_handler(unsigned long data)
58{
59 struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data;
60 unsigned long flags;
61
62 spin_lock_irqsave(info->lock, flags);
63 rtllib_crypt_deinit_entries(info, 0);
64 if (!list_empty(&info->crypt_deinit_list)) {
65 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
66 "deletion list\n", info->name);
67 info->crypt_deinit_timer.expires = jiffies + HZ;
68 add_timer(&info->crypt_deinit_timer);
69 }
70 spin_unlock_irqrestore(info->lock, flags);
71
72}
73EXPORT_SYMBOL(rtllib_crypt_deinit_handler);
74
75void rtllib_crypt_delayed_deinit(struct lib80211_crypt_info *info,
76 struct lib80211_crypt_data **crypt)
77{
78 struct lib80211_crypt_data *tmp;
79 unsigned long flags;
80
81 if (*crypt == NULL)
82 return;
83
84 tmp = *crypt;
85 *crypt = NULL;
86
87 /* must not run ops->deinit() while there may be pending encrypt or
88 * decrypt operations. Use a list of delayed deinits to avoid needing
89 * locking. */
90
91 spin_lock_irqsave(info->lock, flags);
92 list_add(&tmp->list, &info->crypt_deinit_list);
93 if (!timer_pending(&info->crypt_deinit_timer)) {
94 info->crypt_deinit_timer.expires = jiffies + HZ;
95 add_timer(&info->crypt_deinit_timer);
96 }
97 spin_unlock_irqrestore(info->lock, flags);
98}
99EXPORT_SYMBOL(rtllib_crypt_delayed_deinit);
100
101int rtllib_register_crypto_ops(struct lib80211_crypto_ops *ops)
102{
103 unsigned long flags;
104 struct rtllib_crypto_alg *alg;
105
106 if (hcrypt == NULL)
107 return -1;
108
109 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
110 if (alg == NULL)
111 return -ENOMEM;
112
113 alg->ops = ops;
114
115 spin_lock_irqsave(&hcrypt->lock, flags);
116 list_add(&alg->list, &hcrypt->algs);
117 spin_unlock_irqrestore(&hcrypt->lock, flags);
118
119 printk(KERN_DEBUG "rtllib_crypt: registered algorithm '%s'\n",
120 ops->name);
121
122 return 0;
123}
124EXPORT_SYMBOL(rtllib_register_crypto_ops);
125
126int rtllib_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
127{
128 unsigned long flags;
129 struct list_head *ptr;
130 struct rtllib_crypto_alg *del_alg = NULL;
131
132 if (hcrypt == NULL)
133 return -1;
134
135 spin_lock_irqsave(&hcrypt->lock, flags);
136 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
137 struct rtllib_crypto_alg *alg =
138 (struct rtllib_crypto_alg *) ptr;
139 if (alg->ops == ops) {
140 list_del(&alg->list);
141 del_alg = alg;
142 break;
143 }
144 }
145 spin_unlock_irqrestore(&hcrypt->lock, flags);
146
147 if (del_alg) {
148 printk(KERN_DEBUG "rtllib_crypt: unregistered algorithm "
149 "'%s'\n", ops->name);
150 kfree(del_alg);
151 }
152
153 return del_alg ? 0 : -1;
154}
155EXPORT_SYMBOL(rtllib_unregister_crypto_ops);
156
157
158struct lib80211_crypto_ops *rtllib_get_crypto_ops(const char *name)
159{
160 unsigned long flags;
161 struct list_head *ptr;
162 struct rtllib_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 rtllib_crypto_alg *alg =
170 (struct rtllib_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}
183EXPORT_SYMBOL(rtllib_get_crypto_ops);
184
185
186static void * rtllib_crypt_null_init(int keyidx) { return (void *) 1; }
187static void rtllib_crypt_null_deinit(void *priv) {}
188
189static struct lib80211_crypto_ops rtllib_crypt_null = {
190 .name = "NULL",
191 .init = rtllib_crypt_null_init,
192 .deinit = rtllib_crypt_null_deinit,
193 .encrypt_mpdu = NULL,
194 .decrypt_mpdu = NULL,
195 .encrypt_msdu = NULL,
196 .decrypt_msdu = NULL,
197 .set_key = NULL,
198 .get_key = NULL,
199 .extra_mpdu_prefix_len = 0,
200 .extra_mpdu_postfix_len = 0,
201 .extra_msdu_prefix_len = 0,
202 .extra_msdu_postfix_len = 0,
203 .owner = THIS_MODULE,
204};
205
206
207int __init rtllib_crypto_init(void)
208{
209 int ret = -ENOMEM;
210
211 hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
212 if (!hcrypt)
213 goto out;
214
215 INIT_LIST_HEAD(&hcrypt->algs);
216 spin_lock_init(&hcrypt->lock);
217
218 ret = lib80211_register_crypto_ops(&rtllib_crypt_null);
219 if (ret < 0) {
220 kfree(hcrypt);
221 hcrypt = NULL;
222 }
223out:
224 return ret;
225}
226
227
228void __exit rtllib_crypto_deinit(void)
229{
230 struct list_head *ptr, *n;
231
232 if (hcrypt == NULL)
233 return;
234
235 for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
236 ptr = n, n = ptr->next) {
237 struct rtllib_crypto_alg *alg =
238 (struct rtllib_crypto_alg *) ptr;
239 list_del(ptr);
240 printk(KERN_DEBUG "rtllib_crypt: unregistered algorithm "
241 "'%s' (deinit)\n", alg->ops->name);
242 kfree(alg);
243 }
244
245 kfree(hcrypt);
246}
247
248module_init(rtllib_crypto_init);
249module_exit(rtllib_crypto_deinit);
250
251MODULE_LICENSE("GPL");