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b453872c JG |
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/config.h> | |
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 <net/ieee80211.h> | |
23 | ||
24 | MODULE_AUTHOR("Jouni Malinen"); | |
25 | MODULE_DESCRIPTION("HostAP crypto"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | ||
28 | struct ieee80211_crypto_alg { | |
29 | struct list_head list; | |
30 | struct ieee80211_crypto_ops *ops; | |
31 | }; | |
32 | ||
b453872c JG |
33 | struct ieee80211_crypto { |
34 | struct list_head algs; | |
35 | spinlock_t lock; | |
36 | }; | |
37 | ||
38 | static struct ieee80211_crypto *hcrypt; | |
39 | ||
0edd5b44 | 40 | void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force) |
b453872c JG |
41 | { |
42 | struct list_head *ptr, *n; | |
43 | struct ieee80211_crypt_data *entry; | |
44 | ||
45 | for (ptr = ieee->crypt_deinit_list.next, n = ptr->next; | |
46 | ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) { | |
47 | entry = list_entry(ptr, struct ieee80211_crypt_data, list); | |
48 | ||
49 | if (atomic_read(&entry->refcnt) != 0 && !force) | |
50 | continue; | |
51 | ||
52 | list_del(ptr); | |
53 | ||
54 | if (entry->ops) { | |
55 | entry->ops->deinit(entry->priv); | |
56 | module_put(entry->ops->owner); | |
57 | } | |
58 | kfree(entry); | |
59 | } | |
60 | } | |
61 | ||
62 | void 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 | ||
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 | ||
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 = 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 | ||
129 | int 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 = | |
0edd5b44 | 141 | (struct ieee80211_crypto_alg *)ptr; |
b453872c JG |
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 | ||
0edd5b44 | 159 | struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name) |
b453872c JG |
160 | { |
161 | unsigned long flags; | |
162 | struct list_head *ptr; | |
163 | struct ieee80211_crypto_alg *found_alg = NULL; | |
164 | ||
165 | if (hcrypt == NULL) | |
166 | return NULL; | |
167 | ||
168 | spin_lock_irqsave(&hcrypt->lock, flags); | |
169 | for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) { | |
170 | struct ieee80211_crypto_alg *alg = | |
0edd5b44 | 171 | (struct ieee80211_crypto_alg *)ptr; |
b453872c JG |
172 | if (strcmp(alg->ops->name, name) == 0) { |
173 | found_alg = alg; | |
174 | break; | |
175 | } | |
176 | } | |
177 | spin_unlock_irqrestore(&hcrypt->lock, flags); | |
178 | ||
179 | if (found_alg) | |
180 | return found_alg->ops; | |
181 | else | |
182 | return NULL; | |
183 | } | |
184 | ||
0edd5b44 JG |
185 | static void *ieee80211_crypt_null_init(int keyidx) |
186 | { | |
187 | return (void *)1; | |
188 | } | |
189 | static void ieee80211_crypt_null_deinit(void *priv) | |
190 | { | |
191 | } | |
b453872c JG |
192 | |
193 | static struct ieee80211_crypto_ops ieee80211_crypt_null = { | |
74079fdc JK |
194 | .name = "NULL", |
195 | .init = ieee80211_crypt_null_init, | |
196 | .deinit = ieee80211_crypt_null_deinit, | |
197 | .encrypt_mpdu = NULL, | |
198 | .decrypt_mpdu = NULL, | |
199 | .encrypt_msdu = NULL, | |
200 | .decrypt_msdu = NULL, | |
201 | .set_key = NULL, | |
202 | .get_key = NULL, | |
203 | .extra_prefix_len = 0, | |
204 | .extra_postfix_len = 0, | |
205 | .owner = THIS_MODULE, | |
b453872c JG |
206 | }; |
207 | ||
b453872c JG |
208 | static int __init ieee80211_crypto_init(void) |
209 | { | |
210 | int ret = -ENOMEM; | |
211 | ||
212 | hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL); | |
213 | if (!hcrypt) | |
214 | goto out; | |
215 | ||
216 | memset(hcrypt, 0, sizeof(*hcrypt)); | |
217 | INIT_LIST_HEAD(&hcrypt->algs); | |
218 | spin_lock_init(&hcrypt->lock); | |
219 | ||
220 | ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null); | |
221 | if (ret < 0) { | |
222 | kfree(hcrypt); | |
223 | hcrypt = NULL; | |
224 | } | |
0edd5b44 | 225 | out: |
b453872c JG |
226 | return ret; |
227 | } | |
228 | ||
b453872c JG |
229 | static void __exit ieee80211_crypto_deinit(void) |
230 | { | |
231 | struct list_head *ptr, *n; | |
232 | ||
233 | if (hcrypt == NULL) | |
234 | return; | |
235 | ||
236 | for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs; | |
237 | ptr = n, n = ptr->next) { | |
238 | struct ieee80211_crypto_alg *alg = | |
0edd5b44 | 239 | (struct ieee80211_crypto_alg *)ptr; |
b453872c JG |
240 | list_del(ptr); |
241 | printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm " | |
242 | "'%s' (deinit)\n", alg->ops->name); | |
243 | kfree(alg); | |
244 | } | |
245 | ||
246 | kfree(hcrypt); | |
247 | } | |
248 | ||
249 | EXPORT_SYMBOL(ieee80211_crypt_deinit_entries); | |
250 | EXPORT_SYMBOL(ieee80211_crypt_deinit_handler); | |
251 | EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit); | |
252 | ||
253 | EXPORT_SYMBOL(ieee80211_register_crypto_ops); | |
254 | EXPORT_SYMBOL(ieee80211_unregister_crypto_ops); | |
255 | EXPORT_SYMBOL(ieee80211_get_crypto_ops); | |
256 | ||
257 | module_init(ieee80211_crypto_init); | |
258 | module_exit(ieee80211_crypto_deinit); |