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TOMOYO Linux Cross Reference
Linux/net/wireless/lib80211.c

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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++ = '';
 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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