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linux
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
32MODULE_DESCRIPTION(DRV_DESCRIPTION);
33MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
34MODULE_LICENSE("GPL");
35
36struct lib80211_crypto_alg {
37 struct list_head list;
38 struct lib80211_crypto_ops *ops;
39};
40
41static LIST_HEAD(lib80211_crypto_algs);
42static DEFINE_SPINLOCK(lib80211_crypto_lock);
43
44const char *print_ssid(char *buf, const char *ssid, u8 ssid_len)
45{
46 const char *s = ssid;
47 char *d = buf;
48
49 ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN);
50 while (ssid_len--) {
51 if (isprint(*s)) {
52 *d++ = *s++;
53 continue;
54 }
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++;
70 }
71 *d = '\0';
72 return buf;
73}
74EXPORT_SYMBOL(print_ssid);
75
76int 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}
90EXPORT_SYMBOL(lib80211_crypt_info_init);
91
92void 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}
112EXPORT_SYMBOL(lib80211_crypt_info_free);
113
114void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force)
115{
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}
134EXPORT_SYMBOL(lib80211_crypt_deinit_entries);
135
136/* After this, crypt_deinit_list won't accept new members */
137void 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}
145EXPORT_SYMBOL(lib80211_crypt_quiescing);
146
147void 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}
163EXPORT_SYMBOL(lib80211_crypt_deinit_handler);
164
165void 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}
191EXPORT_SYMBOL(lib80211_crypt_delayed_deinit);
192
193int 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}
213EXPORT_SYMBOL(lib80211_register_crypto_ops);
214
215int 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:
229 printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n",
230 ops->name);
231 list_del(&alg->list);
232 spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
233 kfree(alg);
234 return 0;
235}
236EXPORT_SYMBOL(lib80211_unregister_crypto_ops);
237
238struct 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}
255EXPORT_SYMBOL(lib80211_get_crypto_ops);
256
257static void *lib80211_crypt_null_init(int keyidx)
258{
259 return (void *)1;
260}
261
262static void lib80211_crypt_null_deinit(void *priv)
263{
264}
265
266static 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
273static int __init lib80211_init(void)
274{
275 pr_info(DRV_DESCRIPTION "\n");
276 return lib80211_register_crypto_ops(&lib80211_crypt_null);
277}
278
279static void __exit lib80211_exit(void)
280{
281 lib80211_unregister_crypto_ops(&lib80211_crypt_null);
282 BUG_ON(!list_empty(&lib80211_crypto_algs));
283}
284
285module_init(lib80211_init);
286module_exit(lib80211_exit);