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1 | /* |
2 | * lib80211 -- common bits for IEEE802.11 drivers |
3 | * |
4 | * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com> |
5 | * |
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 | * |
14 | */ |
15 | |
16 | #include <linux/module.h> |
17 | #include <linux/ctype.h> |
18 | #include <linux/ieee80211.h> |
19 | #include <linux/errno.h> |
20 | #include <linux/init.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/string.h> |
23 | |
24 | #include <net/lib80211.h> |
25 | |
26 | #define DRV_NAME "lib80211" |
27 | |
28 | #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers" |
29 | |
30 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
31 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); |
32 | MODULE_LICENSE("GPL"); |
33 | |
34 | struct lib80211_crypto_alg { |
35 | struct list_head list; |
36 | struct lib80211_crypto_ops *ops; |
37 | }; |
38 | |
39 | static LIST_HEAD(lib80211_crypto_algs); |
40 | static DEFINE_SPINLOCK(lib80211_crypto_lock); |
41 | |
42 | const char *print_ssid(char *buf, const char *ssid, u8 ssid_len) |
43 | { |
44 | const char *s = ssid; |
45 | char *d = buf; |
46 | |
47 | ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN); |
48 | while (ssid_len--) { |
49 | if (isprint(*s)) { |
50 | *d++ = *s++; |
51 | continue; |
52 | } |
53 | |
54 | *d++ = '\\'; |
55 | if (*s == '\0') |
56 | *d++ = '0'; |
57 | else if (*s == '\n') |
58 | *d++ = 'n'; |
59 | else if (*s == '\r') |
60 | *d++ = 'r'; |
61 | else if (*s == '\t') |
62 | *d++ = 't'; |
63 | else if (*s == '\\') |
64 | *d++ = '\\'; |
65 | else |
66 | d += snprintf(d, 3, "%03o", *s); |
67 | s++; |
68 | } |
69 | *d = '\0'; |
70 | return buf; |
71 | } |
72 | EXPORT_SYMBOL(print_ssid); |
73 | |
74 | int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, |
75 | spinlock_t *lock) |
76 | { |
77 | memset(info, 0, sizeof(*info)); |
78 | |
79 | info->name = name; |
80 | info->lock = lock; |
81 | |
82 | INIT_LIST_HEAD(&info->crypt_deinit_list); |
83 | setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, |
84 | (unsigned long)info); |
85 | |
86 | return 0; |
87 | } |
88 | EXPORT_SYMBOL(lib80211_crypt_info_init); |
89 | |
90 | void lib80211_crypt_info_free(struct lib80211_crypt_info *info) |
91 | { |
92 | int i; |
93 | |
94 | lib80211_crypt_quiescing(info); |
95 | del_timer_sync(&info->crypt_deinit_timer); |
96 | lib80211_crypt_deinit_entries(info, 1); |
97 | |
98 | for (i = 0; i < NUM_WEP_KEYS; i++) { |
99 | struct lib80211_crypt_data *crypt = info->crypt[i]; |
100 | if (crypt) { |
101 | if (crypt->ops) { |
102 | crypt->ops->deinit(crypt->priv); |
103 | module_put(crypt->ops->owner); |
104 | } |
105 | kfree(crypt); |
106 | info->crypt[i] = NULL; |
107 | } |
108 | } |
109 | } |
110 | EXPORT_SYMBOL(lib80211_crypt_info_free); |
111 | |
112 | void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force) |
113 | { |
114 | struct lib80211_crypt_data *entry, *next; |
115 | unsigned long flags; |
116 | |
117 | spin_lock_irqsave(info->lock, flags); |
118 | list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { |
119 | if (atomic_read(&entry->refcnt) != 0 && !force) |
120 | continue; |
121 | |
122 | list_del(&entry->list); |
123 | |
124 | if (entry->ops) { |
125 | entry->ops->deinit(entry->priv); |
126 | module_put(entry->ops->owner); |
127 | } |
128 | kfree(entry); |
129 | } |
130 | spin_unlock_irqrestore(info->lock, flags); |
131 | } |
132 | EXPORT_SYMBOL(lib80211_crypt_deinit_entries); |
133 | |
134 | /* After this, crypt_deinit_list won't accept new members */ |
135 | void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) |
136 | { |
137 | unsigned long flags; |
138 | |
139 | spin_lock_irqsave(info->lock, flags); |
140 | info->crypt_quiesced = 1; |
141 | spin_unlock_irqrestore(info->lock, flags); |
142 | } |
143 | EXPORT_SYMBOL(lib80211_crypt_quiescing); |
144 | |
145 | void lib80211_crypt_deinit_handler(unsigned long data) |
146 | { |
147 | struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data; |
148 | unsigned long flags; |
149 | |
150 | lib80211_crypt_deinit_entries(info, 0); |
151 | |
152 | spin_lock_irqsave(info->lock, flags); |
153 | if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { |
154 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " |
155 | "deletion list\n", info->name); |
156 | info->crypt_deinit_timer.expires = jiffies + HZ; |
157 | add_timer(&info->crypt_deinit_timer); |
158 | } |
159 | spin_unlock_irqrestore(info->lock, flags); |
160 | } |
161 | EXPORT_SYMBOL(lib80211_crypt_deinit_handler); |
162 | |
163 | void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, |
164 | struct lib80211_crypt_data **crypt) |
165 | { |
166 | struct lib80211_crypt_data *tmp; |
167 | unsigned long flags; |
168 | |
169 | if (*crypt == NULL) |
170 | return; |
171 | |
172 | tmp = *crypt; |
173 | *crypt = NULL; |
174 | |
175 | /* must not run ops->deinit() while there may be pending encrypt or |
176 | * decrypt operations. Use a list of delayed deinits to avoid needing |
177 | * locking. */ |
178 | |
179 | spin_lock_irqsave(info->lock, flags); |
180 | if (!info->crypt_quiesced) { |
181 | list_add(&tmp->list, &info->crypt_deinit_list); |
182 | if (!timer_pending(&info->crypt_deinit_timer)) { |
183 | info->crypt_deinit_timer.expires = jiffies + HZ; |
184 | add_timer(&info->crypt_deinit_timer); |
185 | } |
186 | } |
187 | spin_unlock_irqrestore(info->lock, flags); |
188 | } |
189 | EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); |
190 | |
191 | int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) |
192 | { |
193 | unsigned long flags; |
194 | struct lib80211_crypto_alg *alg; |
195 | |
196 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
197 | if (alg == NULL) |
198 | return -ENOMEM; |
199 | |
200 | alg->ops = ops; |
201 | |
202 | spin_lock_irqsave(&lib80211_crypto_lock, flags); |
203 | list_add(&alg->list, &lib80211_crypto_algs); |
204 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
205 | |
206 | printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", |
207 | ops->name); |
208 | |
209 | return 0; |
210 | } |
211 | EXPORT_SYMBOL(lib80211_register_crypto_ops); |
212 | |
213 | int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) |
214 | { |
215 | struct lib80211_crypto_alg *alg; |
216 | unsigned long flags; |
217 | |
218 | spin_lock_irqsave(&lib80211_crypto_lock, flags); |
219 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { |
220 | if (alg->ops == ops) |
221 | goto found; |
222 | } |
223 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
224 | return -EINVAL; |
225 | |
226 | found: |
227 | printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm " |
228 | "'%s'\n", ops->name); |
229 | list_del(&alg->list); |
230 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
231 | kfree(alg); |
232 | return 0; |
233 | } |
234 | EXPORT_SYMBOL(lib80211_unregister_crypto_ops); |
235 | |
236 | struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) |
237 | { |
238 | struct lib80211_crypto_alg *alg; |
239 | unsigned long flags; |
240 | |
241 | spin_lock_irqsave(&lib80211_crypto_lock, flags); |
242 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { |
243 | if (strcmp(alg->ops->name, name) == 0) |
244 | goto found; |
245 | } |
246 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
247 | return NULL; |
248 | |
249 | found: |
250 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
251 | return alg->ops; |
252 | } |
253 | EXPORT_SYMBOL(lib80211_get_crypto_ops); |
254 | |
255 | static void *lib80211_crypt_null_init(int keyidx) |
256 | { |
257 | return (void *)1; |
258 | } |
259 | |
260 | static void lib80211_crypt_null_deinit(void *priv) |
261 | { |
262 | } |
263 | |
264 | static struct lib80211_crypto_ops lib80211_crypt_null = { |
265 | .name = "NULL", |
266 | .init = lib80211_crypt_null_init, |
267 | .deinit = lib80211_crypt_null_deinit, |
268 | .owner = THIS_MODULE, |
269 | }; |
270 | |
271 | static int __init lib80211_init(void) |
272 | { |
273 | printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION "\n"); |
274 | return lib80211_register_crypto_ops(&lib80211_crypt_null); |
275 | } |
276 | |
277 | static void __exit lib80211_exit(void) |
278 | { |
279 | lib80211_unregister_crypto_ops(&lib80211_crypt_null); |
280 | BUG_ON(!list_empty(&lib80211_crypto_algs)); |
281 | } |
282 | |
283 | module_init(lib80211_init); |
284 | module_exit(lib80211_exit); |
285 |
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