Commit | Line | Data |
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7e272fcf JL |
1 | /* |
2 | * lib80211 -- common bits for IEEE802.11 drivers | |
3 | * | |
4 | * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com> | |
5 | * | |
274bfb8d JL |
6 | * Portions copied from old ieee80211 component, w/ original copyright |
7 | * notices below: | |
8 | * | |
9 | * Host AP crypto routines | |
10 | * | |
11 | * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi> | |
12 | * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com> | |
13 | * | |
7e272fcf JL |
14 | */ |
15 | ||
e9c0268f JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
7e272fcf | 18 | #include <linux/module.h> |
2819f8ad | 19 | #include <linux/ctype.h> |
7e272fcf | 20 | #include <linux/ieee80211.h> |
274bfb8d JL |
21 | #include <linux/errno.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/string.h> | |
7e272fcf JL |
25 | |
26 | #include <net/lib80211.h> | |
27 | ||
28 | #define DRV_NAME "lib80211" | |
29 | ||
30 | #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers" | |
31 | ||
32 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
33 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | ||
274bfb8d JL |
36 | struct lib80211_crypto_alg { |
37 | struct list_head list; | |
38 | struct lib80211_crypto_ops *ops; | |
39 | }; | |
40 | ||
41 | static LIST_HEAD(lib80211_crypto_algs); | |
42 | static DEFINE_SPINLOCK(lib80211_crypto_lock); | |
43 | ||
9d630c77 PR |
44 | static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, |
45 | int force); | |
46 | static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info); | |
e99e88a9 | 47 | static void lib80211_crypt_deinit_handler(struct timer_list *t); |
9d630c77 | 48 | |
2ba4b32e JL |
49 | int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, |
50 | spinlock_t *lock) | |
51 | { | |
52 | memset(info, 0, sizeof(*info)); | |
53 | ||
54 | info->name = name; | |
55 | info->lock = lock; | |
56 | ||
57 | INIT_LIST_HEAD(&info->crypt_deinit_list); | |
e99e88a9 KC |
58 | timer_setup(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, |
59 | 0); | |
2ba4b32e JL |
60 | |
61 | return 0; | |
62 | } | |
63 | EXPORT_SYMBOL(lib80211_crypt_info_init); | |
64 | ||
65 | void lib80211_crypt_info_free(struct lib80211_crypt_info *info) | |
66 | { | |
67 | int i; | |
68 | ||
69 | lib80211_crypt_quiescing(info); | |
70 | del_timer_sync(&info->crypt_deinit_timer); | |
71 | lib80211_crypt_deinit_entries(info, 1); | |
72 | ||
73 | for (i = 0; i < NUM_WEP_KEYS; i++) { | |
74 | struct lib80211_crypt_data *crypt = info->crypt[i]; | |
75 | if (crypt) { | |
76 | if (crypt->ops) { | |
77 | crypt->ops->deinit(crypt->priv); | |
78 | module_put(crypt->ops->owner); | |
79 | } | |
80 | kfree(crypt); | |
81 | info->crypt[i] = NULL; | |
82 | } | |
83 | } | |
84 | } | |
85 | EXPORT_SYMBOL(lib80211_crypt_info_free); | |
86 | ||
9d630c77 PR |
87 | static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, |
88 | int force) | |
7e272fcf | 89 | { |
274bfb8d JL |
90 | struct lib80211_crypt_data *entry, *next; |
91 | unsigned long flags; | |
92 | ||
93 | spin_lock_irqsave(info->lock, flags); | |
94 | list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { | |
95 | if (atomic_read(&entry->refcnt) != 0 && !force) | |
96 | continue; | |
97 | ||
98 | list_del(&entry->list); | |
99 | ||
100 | if (entry->ops) { | |
101 | entry->ops->deinit(entry->priv); | |
102 | module_put(entry->ops->owner); | |
103 | } | |
104 | kfree(entry); | |
105 | } | |
106 | spin_unlock_irqrestore(info->lock, flags); | |
107 | } | |
274bfb8d JL |
108 | |
109 | /* After this, crypt_deinit_list won't accept new members */ | |
9d630c77 | 110 | static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) |
274bfb8d JL |
111 | { |
112 | unsigned long flags; | |
113 | ||
114 | spin_lock_irqsave(info->lock, flags); | |
115 | info->crypt_quiesced = 1; | |
116 | spin_unlock_irqrestore(info->lock, flags); | |
117 | } | |
274bfb8d | 118 | |
e99e88a9 | 119 | static void lib80211_crypt_deinit_handler(struct timer_list *t) |
274bfb8d | 120 | { |
e99e88a9 KC |
121 | struct lib80211_crypt_info *info = from_timer(info, t, |
122 | crypt_deinit_timer); | |
274bfb8d JL |
123 | unsigned long flags; |
124 | ||
125 | lib80211_crypt_deinit_entries(info, 0); | |
126 | ||
127 | spin_lock_irqsave(info->lock, flags); | |
128 | if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { | |
129 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " | |
130 | "deletion list\n", info->name); | |
131 | info->crypt_deinit_timer.expires = jiffies + HZ; | |
132 | add_timer(&info->crypt_deinit_timer); | |
133 | } | |
134 | spin_unlock_irqrestore(info->lock, flags); | |
135 | } | |
274bfb8d JL |
136 | |
137 | void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, | |
138 | struct lib80211_crypt_data **crypt) | |
139 | { | |
140 | struct lib80211_crypt_data *tmp; | |
141 | unsigned long flags; | |
142 | ||
143 | if (*crypt == NULL) | |
144 | return; | |
145 | ||
146 | tmp = *crypt; | |
147 | *crypt = NULL; | |
148 | ||
149 | /* must not run ops->deinit() while there may be pending encrypt or | |
150 | * decrypt operations. Use a list of delayed deinits to avoid needing | |
151 | * locking. */ | |
152 | ||
153 | spin_lock_irqsave(info->lock, flags); | |
154 | if (!info->crypt_quiesced) { | |
155 | list_add(&tmp->list, &info->crypt_deinit_list); | |
156 | if (!timer_pending(&info->crypt_deinit_timer)) { | |
157 | info->crypt_deinit_timer.expires = jiffies + HZ; | |
158 | add_timer(&info->crypt_deinit_timer); | |
159 | } | |
160 | } | |
161 | spin_unlock_irqrestore(info->lock, flags); | |
162 | } | |
163 | EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); | |
164 | ||
165 | int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) | |
166 | { | |
167 | unsigned long flags; | |
168 | struct lib80211_crypto_alg *alg; | |
169 | ||
170 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); | |
171 | if (alg == NULL) | |
172 | return -ENOMEM; | |
173 | ||
174 | alg->ops = ops; | |
175 | ||
176 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
177 | list_add(&alg->list, &lib80211_crypto_algs); | |
178 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
179 | ||
180 | printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", | |
181 | ops->name); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | EXPORT_SYMBOL(lib80211_register_crypto_ops); | |
186 | ||
187 | int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) | |
188 | { | |
189 | struct lib80211_crypto_alg *alg; | |
190 | unsigned long flags; | |
191 | ||
192 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
193 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { | |
194 | if (alg->ops == ops) | |
195 | goto found; | |
196 | } | |
197 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
198 | return -EINVAL; | |
199 | ||
200 | found: | |
e9c0268f JP |
201 | printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n", |
202 | ops->name); | |
274bfb8d JL |
203 | list_del(&alg->list); |
204 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
205 | kfree(alg); | |
7e272fcf JL |
206 | return 0; |
207 | } | |
274bfb8d JL |
208 | EXPORT_SYMBOL(lib80211_unregister_crypto_ops); |
209 | ||
210 | struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) | |
211 | { | |
212 | struct lib80211_crypto_alg *alg; | |
213 | unsigned long flags; | |
214 | ||
215 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
216 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { | |
217 | if (strcmp(alg->ops->name, name) == 0) | |
218 | goto found; | |
219 | } | |
220 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
221 | return NULL; | |
222 | ||
223 | found: | |
224 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
225 | return alg->ops; | |
226 | } | |
227 | EXPORT_SYMBOL(lib80211_get_crypto_ops); | |
228 | ||
229 | static void *lib80211_crypt_null_init(int keyidx) | |
230 | { | |
231 | return (void *)1; | |
232 | } | |
233 | ||
234 | static void lib80211_crypt_null_deinit(void *priv) | |
235 | { | |
236 | } | |
237 | ||
238 | static struct lib80211_crypto_ops lib80211_crypt_null = { | |
239 | .name = "NULL", | |
240 | .init = lib80211_crypt_null_init, | |
241 | .deinit = lib80211_crypt_null_deinit, | |
242 | .owner = THIS_MODULE, | |
243 | }; | |
244 | ||
245 | static int __init lib80211_init(void) | |
246 | { | |
e9c0268f | 247 | pr_info(DRV_DESCRIPTION "\n"); |
274bfb8d JL |
248 | return lib80211_register_crypto_ops(&lib80211_crypt_null); |
249 | } | |
7e272fcf | 250 | |
274bfb8d | 251 | static void __exit lib80211_exit(void) |
7e272fcf | 252 | { |
274bfb8d JL |
253 | lib80211_unregister_crypto_ops(&lib80211_crypt_null); |
254 | BUG_ON(!list_empty(&lib80211_crypto_algs)); | |
7e272fcf JL |
255 | } |
256 | ||
274bfb8d JL |
257 | module_init(lib80211_init); |
258 | module_exit(lib80211_exit); |