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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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | |
18 | #include <linux/module.h> |
19 | #include <linux/ctype.h> |
20 | #include <linux/ieee80211.h> |
21 | #include <linux/errno.h> |
22 | #include <linux/init.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/string.h> |
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 | |
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 | |
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); |
47 | static void lib80211_crypt_deinit_handler(unsigned long data); |
48 | |
49 | const char *print_ssid(char *buf, const char *ssid, u8 ssid_len) |
50 | { |
51 | const char *s = ssid; |
52 | char *d = buf; |
53 | |
54 | ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN); |
55 | while (ssid_len--) { |
56 | if (isprint(*s)) { |
57 | *d++ = *s++; |
58 | continue; |
59 | } |
60 | |
61 | *d++ = '\\'; |
62 | if (*s == '\0') |
63 | *d++ = '0'; |
64 | else if (*s == '\n') |
65 | *d++ = 'n'; |
66 | else if (*s == '\r') |
67 | *d++ = 'r'; |
68 | else if (*s == '\t') |
69 | *d++ = 't'; |
70 | else if (*s == '\\') |
71 | *d++ = '\\'; |
72 | else |
73 | d += snprintf(d, 3, "%03o", *s); |
74 | s++; |
75 | } |
76 | *d = '\0'; |
77 | return buf; |
78 | } |
79 | EXPORT_SYMBOL(print_ssid); |
80 | |
81 | int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, |
82 | spinlock_t *lock) |
83 | { |
84 | memset(info, 0, sizeof(*info)); |
85 | |
86 | info->name = name; |
87 | info->lock = lock; |
88 | |
89 | INIT_LIST_HEAD(&info->crypt_deinit_list); |
90 | setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, |
91 | (unsigned long)info); |
92 | |
93 | return 0; |
94 | } |
95 | EXPORT_SYMBOL(lib80211_crypt_info_init); |
96 | |
97 | void lib80211_crypt_info_free(struct lib80211_crypt_info *info) |
98 | { |
99 | int i; |
100 | |
101 | lib80211_crypt_quiescing(info); |
102 | del_timer_sync(&info->crypt_deinit_timer); |
103 | lib80211_crypt_deinit_entries(info, 1); |
104 | |
105 | for (i = 0; i < NUM_WEP_KEYS; i++) { |
106 | struct lib80211_crypt_data *crypt = info->crypt[i]; |
107 | if (crypt) { |
108 | if (crypt->ops) { |
109 | crypt->ops->deinit(crypt->priv); |
110 | module_put(crypt->ops->owner); |
111 | } |
112 | kfree(crypt); |
113 | info->crypt[i] = NULL; |
114 | } |
115 | } |
116 | } |
117 | EXPORT_SYMBOL(lib80211_crypt_info_free); |
118 | |
119 | static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, |
120 | int force) |
121 | { |
122 | struct lib80211_crypt_data *entry, *next; |
123 | unsigned long flags; |
124 | |
125 | spin_lock_irqsave(info->lock, flags); |
126 | list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { |
127 | if (atomic_read(&entry->refcnt) != 0 && !force) |
128 | continue; |
129 | |
130 | list_del(&entry->list); |
131 | |
132 | if (entry->ops) { |
133 | entry->ops->deinit(entry->priv); |
134 | module_put(entry->ops->owner); |
135 | } |
136 | kfree(entry); |
137 | } |
138 | spin_unlock_irqrestore(info->lock, flags); |
139 | } |
140 | |
141 | /* After this, crypt_deinit_list won't accept new members */ |
142 | static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) |
143 | { |
144 | unsigned long flags; |
145 | |
146 | spin_lock_irqsave(info->lock, flags); |
147 | info->crypt_quiesced = 1; |
148 | spin_unlock_irqrestore(info->lock, flags); |
149 | } |
150 | |
151 | static void lib80211_crypt_deinit_handler(unsigned long data) |
152 | { |
153 | struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data; |
154 | unsigned long flags; |
155 | |
156 | lib80211_crypt_deinit_entries(info, 0); |
157 | |
158 | spin_lock_irqsave(info->lock, flags); |
159 | if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { |
160 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " |
161 | "deletion list\n", info->name); |
162 | info->crypt_deinit_timer.expires = jiffies + HZ; |
163 | add_timer(&info->crypt_deinit_timer); |
164 | } |
165 | spin_unlock_irqrestore(info->lock, flags); |
166 | } |
167 | |
168 | void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, |
169 | struct lib80211_crypt_data **crypt) |
170 | { |
171 | struct lib80211_crypt_data *tmp; |
172 | unsigned long flags; |
173 | |
174 | if (*crypt == NULL) |
175 | return; |
176 | |
177 | tmp = *crypt; |
178 | *crypt = NULL; |
179 | |
180 | /* must not run ops->deinit() while there may be pending encrypt or |
181 | * decrypt operations. Use a list of delayed deinits to avoid needing |
182 | * locking. */ |
183 | |
184 | spin_lock_irqsave(info->lock, flags); |
185 | if (!info->crypt_quiesced) { |
186 | list_add(&tmp->list, &info->crypt_deinit_list); |
187 | if (!timer_pending(&info->crypt_deinit_timer)) { |
188 | info->crypt_deinit_timer.expires = jiffies + HZ; |
189 | add_timer(&info->crypt_deinit_timer); |
190 | } |
191 | } |
192 | spin_unlock_irqrestore(info->lock, flags); |
193 | } |
194 | EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); |
195 | |
196 | int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) |
197 | { |
198 | unsigned long flags; |
199 | struct lib80211_crypto_alg *alg; |
200 | |
201 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
202 | if (alg == NULL) |
203 | return -ENOMEM; |
204 | |
205 | alg->ops = ops; |
206 | |
207 | spin_lock_irqsave(&lib80211_crypto_lock, flags); |
208 | list_add(&alg->list, &lib80211_crypto_algs); |
209 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
210 | |
211 | printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", |
212 | ops->name); |
213 | |
214 | return 0; |
215 | } |
216 | EXPORT_SYMBOL(lib80211_register_crypto_ops); |
217 | |
218 | int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) |
219 | { |
220 | struct lib80211_crypto_alg *alg; |
221 | unsigned long flags; |
222 | |
223 | spin_lock_irqsave(&lib80211_crypto_lock, flags); |
224 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { |
225 | if (alg->ops == ops) |
226 | goto found; |
227 | } |
228 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
229 | return -EINVAL; |
230 | |
231 | found: |
232 | printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n", |
233 | ops->name); |
234 | list_del(&alg->list); |
235 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
236 | kfree(alg); |
237 | return 0; |
238 | } |
239 | EXPORT_SYMBOL(lib80211_unregister_crypto_ops); |
240 | |
241 | struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) |
242 | { |
243 | struct lib80211_crypto_alg *alg; |
244 | unsigned long flags; |
245 | |
246 | spin_lock_irqsave(&lib80211_crypto_lock, flags); |
247 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { |
248 | if (strcmp(alg->ops->name, name) == 0) |
249 | goto found; |
250 | } |
251 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
252 | return NULL; |
253 | |
254 | found: |
255 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); |
256 | return alg->ops; |
257 | } |
258 | EXPORT_SYMBOL(lib80211_get_crypto_ops); |
259 | |
260 | static void *lib80211_crypt_null_init(int keyidx) |
261 | { |
262 | return (void *)1; |
263 | } |
264 | |
265 | static void lib80211_crypt_null_deinit(void *priv) |
266 | { |
267 | } |
268 | |
269 | static struct lib80211_crypto_ops lib80211_crypt_null = { |
270 | .name = "NULL", |
271 | .init = lib80211_crypt_null_init, |
272 | .deinit = lib80211_crypt_null_deinit, |
273 | .owner = THIS_MODULE, |
274 | }; |
275 | |
276 | static int __init lib80211_init(void) |
277 | { |
278 | pr_info(DRV_DESCRIPTION "\n"); |
279 | return lib80211_register_crypto_ops(&lib80211_crypt_null); |
280 | } |
281 | |
282 | static void __exit lib80211_exit(void) |
283 | { |
284 | lib80211_unregister_crypto_ops(&lib80211_crypt_null); |
285 | BUG_ON(!list_empty(&lib80211_crypto_algs)); |
286 | } |
287 | |
288 | module_init(lib80211_init); |
289 | module_exit(lib80211_exit); |
290 |
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