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 | ||
9387b7ca | 44 | const char *print_ssid(char *buf, const char *ssid, u8 ssid_len) |
7e272fcf | 45 | { |
7e272fcf | 46 | const char *s = ssid; |
9387b7ca | 47 | char *d = buf; |
7e272fcf | 48 | |
7e272fcf JL |
49 | ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN); |
50 | while (ssid_len--) { | |
2819f8ad | 51 | if (isprint(*s)) { |
7e272fcf | 52 | *d++ = *s++; |
2819f8ad | 53 | continue; |
7e272fcf | 54 | } |
2819f8ad JL |
55 | |
56 | *d++ = '\\'; | |
57 | if (*s == '\0') | |
58 | *d++ = '0'; | |
59 | else if (*s == '\n') | |
60 | *d++ = 'n'; | |
61 | else if (*s == '\r') | |
62 | *d++ = 'r'; | |
63 | else if (*s == '\t') | |
64 | *d++ = 't'; | |
65 | else if (*s == '\\') | |
66 | *d++ = '\\'; | |
67 | else | |
68 | d += snprintf(d, 3, "%03o", *s); | |
69 | s++; | |
7e272fcf JL |
70 | } |
71 | *d = '\0'; | |
9387b7ca | 72 | return buf; |
7e272fcf | 73 | } |
9387b7ca | 74 | EXPORT_SYMBOL(print_ssid); |
7e272fcf | 75 | |
2ba4b32e JL |
76 | int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, |
77 | spinlock_t *lock) | |
78 | { | |
79 | memset(info, 0, sizeof(*info)); | |
80 | ||
81 | info->name = name; | |
82 | info->lock = lock; | |
83 | ||
84 | INIT_LIST_HEAD(&info->crypt_deinit_list); | |
85 | setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, | |
86 | (unsigned long)info); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | EXPORT_SYMBOL(lib80211_crypt_info_init); | |
91 | ||
92 | void lib80211_crypt_info_free(struct lib80211_crypt_info *info) | |
93 | { | |
94 | int i; | |
95 | ||
96 | lib80211_crypt_quiescing(info); | |
97 | del_timer_sync(&info->crypt_deinit_timer); | |
98 | lib80211_crypt_deinit_entries(info, 1); | |
99 | ||
100 | for (i = 0; i < NUM_WEP_KEYS; i++) { | |
101 | struct lib80211_crypt_data *crypt = info->crypt[i]; | |
102 | if (crypt) { | |
103 | if (crypt->ops) { | |
104 | crypt->ops->deinit(crypt->priv); | |
105 | module_put(crypt->ops->owner); | |
106 | } | |
107 | kfree(crypt); | |
108 | info->crypt[i] = NULL; | |
109 | } | |
110 | } | |
111 | } | |
112 | EXPORT_SYMBOL(lib80211_crypt_info_free); | |
113 | ||
274bfb8d | 114 | void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force) |
7e272fcf | 115 | { |
274bfb8d JL |
116 | struct lib80211_crypt_data *entry, *next; |
117 | unsigned long flags; | |
118 | ||
119 | spin_lock_irqsave(info->lock, flags); | |
120 | list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { | |
121 | if (atomic_read(&entry->refcnt) != 0 && !force) | |
122 | continue; | |
123 | ||
124 | list_del(&entry->list); | |
125 | ||
126 | if (entry->ops) { | |
127 | entry->ops->deinit(entry->priv); | |
128 | module_put(entry->ops->owner); | |
129 | } | |
130 | kfree(entry); | |
131 | } | |
132 | spin_unlock_irqrestore(info->lock, flags); | |
133 | } | |
134 | EXPORT_SYMBOL(lib80211_crypt_deinit_entries); | |
135 | ||
136 | /* After this, crypt_deinit_list won't accept new members */ | |
137 | void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) | |
138 | { | |
139 | unsigned long flags; | |
140 | ||
141 | spin_lock_irqsave(info->lock, flags); | |
142 | info->crypt_quiesced = 1; | |
143 | spin_unlock_irqrestore(info->lock, flags); | |
144 | } | |
145 | EXPORT_SYMBOL(lib80211_crypt_quiescing); | |
146 | ||
147 | void lib80211_crypt_deinit_handler(unsigned long data) | |
148 | { | |
149 | struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data; | |
150 | unsigned long flags; | |
151 | ||
152 | lib80211_crypt_deinit_entries(info, 0); | |
153 | ||
154 | spin_lock_irqsave(info->lock, flags); | |
155 | if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { | |
156 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " | |
157 | "deletion list\n", info->name); | |
158 | info->crypt_deinit_timer.expires = jiffies + HZ; | |
159 | add_timer(&info->crypt_deinit_timer); | |
160 | } | |
161 | spin_unlock_irqrestore(info->lock, flags); | |
162 | } | |
163 | EXPORT_SYMBOL(lib80211_crypt_deinit_handler); | |
164 | ||
165 | void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, | |
166 | struct lib80211_crypt_data **crypt) | |
167 | { | |
168 | struct lib80211_crypt_data *tmp; | |
169 | unsigned long flags; | |
170 | ||
171 | if (*crypt == NULL) | |
172 | return; | |
173 | ||
174 | tmp = *crypt; | |
175 | *crypt = NULL; | |
176 | ||
177 | /* must not run ops->deinit() while there may be pending encrypt or | |
178 | * decrypt operations. Use a list of delayed deinits to avoid needing | |
179 | * locking. */ | |
180 | ||
181 | spin_lock_irqsave(info->lock, flags); | |
182 | if (!info->crypt_quiesced) { | |
183 | list_add(&tmp->list, &info->crypt_deinit_list); | |
184 | if (!timer_pending(&info->crypt_deinit_timer)) { | |
185 | info->crypt_deinit_timer.expires = jiffies + HZ; | |
186 | add_timer(&info->crypt_deinit_timer); | |
187 | } | |
188 | } | |
189 | spin_unlock_irqrestore(info->lock, flags); | |
190 | } | |
191 | EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); | |
192 | ||
193 | int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) | |
194 | { | |
195 | unsigned long flags; | |
196 | struct lib80211_crypto_alg *alg; | |
197 | ||
198 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); | |
199 | if (alg == NULL) | |
200 | return -ENOMEM; | |
201 | ||
202 | alg->ops = ops; | |
203 | ||
204 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
205 | list_add(&alg->list, &lib80211_crypto_algs); | |
206 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
207 | ||
208 | printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", | |
209 | ops->name); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | EXPORT_SYMBOL(lib80211_register_crypto_ops); | |
214 | ||
215 | int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) | |
216 | { | |
217 | struct lib80211_crypto_alg *alg; | |
218 | unsigned long flags; | |
219 | ||
220 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
221 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { | |
222 | if (alg->ops == ops) | |
223 | goto found; | |
224 | } | |
225 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
226 | return -EINVAL; | |
227 | ||
228 | found: | |
e9c0268f JP |
229 | printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n", |
230 | ops->name); | |
274bfb8d JL |
231 | list_del(&alg->list); |
232 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
233 | kfree(alg); | |
7e272fcf JL |
234 | return 0; |
235 | } | |
274bfb8d JL |
236 | EXPORT_SYMBOL(lib80211_unregister_crypto_ops); |
237 | ||
238 | struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) | |
239 | { | |
240 | struct lib80211_crypto_alg *alg; | |
241 | unsigned long flags; | |
242 | ||
243 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
244 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { | |
245 | if (strcmp(alg->ops->name, name) == 0) | |
246 | goto found; | |
247 | } | |
248 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
249 | return NULL; | |
250 | ||
251 | found: | |
252 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
253 | return alg->ops; | |
254 | } | |
255 | EXPORT_SYMBOL(lib80211_get_crypto_ops); | |
256 | ||
257 | static void *lib80211_crypt_null_init(int keyidx) | |
258 | { | |
259 | return (void *)1; | |
260 | } | |
261 | ||
262 | static void lib80211_crypt_null_deinit(void *priv) | |
263 | { | |
264 | } | |
265 | ||
266 | static struct lib80211_crypto_ops lib80211_crypt_null = { | |
267 | .name = "NULL", | |
268 | .init = lib80211_crypt_null_init, | |
269 | .deinit = lib80211_crypt_null_deinit, | |
270 | .owner = THIS_MODULE, | |
271 | }; | |
272 | ||
273 | static int __init lib80211_init(void) | |
274 | { | |
e9c0268f | 275 | pr_info(DRV_DESCRIPTION "\n"); |
274bfb8d JL |
276 | return lib80211_register_crypto_ops(&lib80211_crypt_null); |
277 | } | |
7e272fcf | 278 | |
274bfb8d | 279 | static void __exit lib80211_exit(void) |
7e272fcf | 280 | { |
274bfb8d JL |
281 | lib80211_unregister_crypto_ops(&lib80211_crypt_null); |
282 | BUG_ON(!list_empty(&lib80211_crypto_algs)); | |
7e272fcf JL |
283 | } |
284 | ||
274bfb8d JL |
285 | module_init(lib80211_init); |
286 | module_exit(lib80211_exit); |