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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7e272fcf JL |
2 | /* |
3 | * lib80211 -- common bits for IEEE802.11 drivers | |
4 | * | |
5 | * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com> | |
6 | * | |
274bfb8d JL |
7 | * Portions copied from old ieee80211 component, w/ original copyright |
8 | * notices below: | |
9 | * | |
10 | * Host AP crypto routines | |
11 | * | |
12 | * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi> | |
13 | * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com> | |
14 | * | |
7e272fcf JL |
15 | */ |
16 | ||
e9c0268f JP |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
7e272fcf | 19 | #include <linux/module.h> |
2819f8ad | 20 | #include <linux/ctype.h> |
7e272fcf | 21 | #include <linux/ieee80211.h> |
274bfb8d JL |
22 | #include <linux/errno.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/string.h> | |
7e272fcf JL |
26 | |
27 | #include <net/lib80211.h> | |
28 | ||
29 | #define DRV_NAME "lib80211" | |
30 | ||
31 | #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers" | |
32 | ||
33 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
34 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
274bfb8d JL |
37 | struct lib80211_crypto_alg { |
38 | struct list_head list; | |
39 | struct lib80211_crypto_ops *ops; | |
40 | }; | |
41 | ||
42 | static LIST_HEAD(lib80211_crypto_algs); | |
43 | static DEFINE_SPINLOCK(lib80211_crypto_lock); | |
44 | ||
9d630c77 PR |
45 | static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, |
46 | int force); | |
47 | static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info); | |
e99e88a9 | 48 | static void lib80211_crypt_deinit_handler(struct timer_list *t); |
9d630c77 | 49 | |
2ba4b32e JL |
50 | int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, |
51 | spinlock_t *lock) | |
52 | { | |
53 | memset(info, 0, sizeof(*info)); | |
54 | ||
55 | info->name = name; | |
56 | info->lock = lock; | |
57 | ||
58 | INIT_LIST_HEAD(&info->crypt_deinit_list); | |
e99e88a9 KC |
59 | timer_setup(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, |
60 | 0); | |
2ba4b32e JL |
61 | |
62 | return 0; | |
63 | } | |
64 | EXPORT_SYMBOL(lib80211_crypt_info_init); | |
65 | ||
66 | void lib80211_crypt_info_free(struct lib80211_crypt_info *info) | |
67 | { | |
68 | int i; | |
69 | ||
70 | lib80211_crypt_quiescing(info); | |
71 | del_timer_sync(&info->crypt_deinit_timer); | |
72 | lib80211_crypt_deinit_entries(info, 1); | |
73 | ||
74 | for (i = 0; i < NUM_WEP_KEYS; i++) { | |
75 | struct lib80211_crypt_data *crypt = info->crypt[i]; | |
76 | if (crypt) { | |
77 | if (crypt->ops) { | |
78 | crypt->ops->deinit(crypt->priv); | |
79 | module_put(crypt->ops->owner); | |
80 | } | |
81 | kfree(crypt); | |
82 | info->crypt[i] = NULL; | |
83 | } | |
84 | } | |
85 | } | |
86 | EXPORT_SYMBOL(lib80211_crypt_info_free); | |
87 | ||
9d630c77 PR |
88 | static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, |
89 | int force) | |
7e272fcf | 90 | { |
274bfb8d JL |
91 | struct lib80211_crypt_data *entry, *next; |
92 | unsigned long flags; | |
93 | ||
94 | spin_lock_irqsave(info->lock, flags); | |
95 | list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { | |
96 | if (atomic_read(&entry->refcnt) != 0 && !force) | |
97 | continue; | |
98 | ||
99 | list_del(&entry->list); | |
100 | ||
101 | if (entry->ops) { | |
102 | entry->ops->deinit(entry->priv); | |
103 | module_put(entry->ops->owner); | |
104 | } | |
105 | kfree(entry); | |
106 | } | |
107 | spin_unlock_irqrestore(info->lock, flags); | |
108 | } | |
274bfb8d JL |
109 | |
110 | /* After this, crypt_deinit_list won't accept new members */ | |
9d630c77 | 111 | static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) |
274bfb8d JL |
112 | { |
113 | unsigned long flags; | |
114 | ||
115 | spin_lock_irqsave(info->lock, flags); | |
116 | info->crypt_quiesced = 1; | |
117 | spin_unlock_irqrestore(info->lock, flags); | |
118 | } | |
274bfb8d | 119 | |
e99e88a9 | 120 | static void lib80211_crypt_deinit_handler(struct timer_list *t) |
274bfb8d | 121 | { |
e99e88a9 KC |
122 | struct lib80211_crypt_info *info = from_timer(info, t, |
123 | crypt_deinit_timer); | |
274bfb8d JL |
124 | unsigned long flags; |
125 | ||
126 | lib80211_crypt_deinit_entries(info, 0); | |
127 | ||
128 | spin_lock_irqsave(info->lock, flags); | |
129 | if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { | |
130 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " | |
131 | "deletion list\n", info->name); | |
132 | info->crypt_deinit_timer.expires = jiffies + HZ; | |
133 | add_timer(&info->crypt_deinit_timer); | |
134 | } | |
135 | spin_unlock_irqrestore(info->lock, flags); | |
136 | } | |
274bfb8d JL |
137 | |
138 | void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, | |
139 | struct lib80211_crypt_data **crypt) | |
140 | { | |
141 | struct lib80211_crypt_data *tmp; | |
142 | unsigned long flags; | |
143 | ||
144 | if (*crypt == NULL) | |
145 | return; | |
146 | ||
147 | tmp = *crypt; | |
148 | *crypt = NULL; | |
149 | ||
150 | /* must not run ops->deinit() while there may be pending encrypt or | |
151 | * decrypt operations. Use a list of delayed deinits to avoid needing | |
152 | * locking. */ | |
153 | ||
154 | spin_lock_irqsave(info->lock, flags); | |
155 | if (!info->crypt_quiesced) { | |
156 | list_add(&tmp->list, &info->crypt_deinit_list); | |
157 | if (!timer_pending(&info->crypt_deinit_timer)) { | |
158 | info->crypt_deinit_timer.expires = jiffies + HZ; | |
159 | add_timer(&info->crypt_deinit_timer); | |
160 | } | |
161 | } | |
162 | spin_unlock_irqrestore(info->lock, flags); | |
163 | } | |
164 | EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); | |
165 | ||
166 | int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) | |
167 | { | |
168 | unsigned long flags; | |
169 | struct lib80211_crypto_alg *alg; | |
170 | ||
171 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); | |
172 | if (alg == NULL) | |
173 | return -ENOMEM; | |
174 | ||
175 | alg->ops = ops; | |
176 | ||
177 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
178 | list_add(&alg->list, &lib80211_crypto_algs); | |
179 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
180 | ||
181 | printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", | |
182 | ops->name); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | EXPORT_SYMBOL(lib80211_register_crypto_ops); | |
187 | ||
188 | int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) | |
189 | { | |
190 | struct lib80211_crypto_alg *alg; | |
191 | unsigned long flags; | |
192 | ||
193 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
194 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { | |
195 | if (alg->ops == ops) | |
196 | goto found; | |
197 | } | |
198 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
199 | return -EINVAL; | |
200 | ||
201 | found: | |
e9c0268f JP |
202 | printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n", |
203 | ops->name); | |
274bfb8d JL |
204 | list_del(&alg->list); |
205 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
206 | kfree(alg); | |
7e272fcf JL |
207 | return 0; |
208 | } | |
274bfb8d JL |
209 | EXPORT_SYMBOL(lib80211_unregister_crypto_ops); |
210 | ||
211 | struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) | |
212 | { | |
213 | struct lib80211_crypto_alg *alg; | |
214 | unsigned long flags; | |
215 | ||
216 | spin_lock_irqsave(&lib80211_crypto_lock, flags); | |
217 | list_for_each_entry(alg, &lib80211_crypto_algs, list) { | |
218 | if (strcmp(alg->ops->name, name) == 0) | |
219 | goto found; | |
220 | } | |
221 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
222 | return NULL; | |
223 | ||
224 | found: | |
225 | spin_unlock_irqrestore(&lib80211_crypto_lock, flags); | |
226 | return alg->ops; | |
227 | } | |
228 | EXPORT_SYMBOL(lib80211_get_crypto_ops); | |
229 | ||
230 | static void *lib80211_crypt_null_init(int keyidx) | |
231 | { | |
232 | return (void *)1; | |
233 | } | |
234 | ||
235 | static void lib80211_crypt_null_deinit(void *priv) | |
236 | { | |
237 | } | |
238 | ||
239 | static struct lib80211_crypto_ops lib80211_crypt_null = { | |
240 | .name = "NULL", | |
241 | .init = lib80211_crypt_null_init, | |
242 | .deinit = lib80211_crypt_null_deinit, | |
243 | .owner = THIS_MODULE, | |
244 | }; | |
245 | ||
246 | static int __init lib80211_init(void) | |
247 | { | |
e9c0268f | 248 | pr_info(DRV_DESCRIPTION "\n"); |
274bfb8d JL |
249 | return lib80211_register_crypto_ops(&lib80211_crypt_null); |
250 | } | |
7e272fcf | 251 | |
274bfb8d | 252 | static void __exit lib80211_exit(void) |
7e272fcf | 253 | { |
274bfb8d JL |
254 | lib80211_unregister_crypto_ops(&lib80211_crypt_null); |
255 | BUG_ON(!list_empty(&lib80211_crypto_algs)); | |
7e272fcf JL |
256 | } |
257 | ||
274bfb8d JL |
258 | module_init(lib80211_init); |
259 | module_exit(lib80211_exit); |