2 * Host AP crypto routines
4 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation. See README and COPYING for
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 //#include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
23 #include "ieee80211.h"
25 MODULE_AUTHOR("Jouni Malinen");
26 MODULE_DESCRIPTION("HostAP crypto");
27 MODULE_LICENSE("GPL");
29 struct ieee80211_crypto_alg {
30 struct list_head list;
31 struct ieee80211_crypto_ops *ops;
35 struct ieee80211_crypto {
36 struct list_head algs;
40 static struct ieee80211_crypto *hcrypt;
42 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
45 struct list_head *ptr, *n;
46 struct ieee80211_crypt_data *entry;
48 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
49 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
50 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
52 if (atomic_read(&entry->refcnt) != 0 && !force)
58 entry->ops->deinit(entry->priv);
63 void ieee80211_crypt_deinit_handler(unsigned long data)
65 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
68 spin_lock_irqsave(&ieee->lock, flags);
69 ieee80211_crypt_deinit_entries(ieee, 0);
70 if (!list_empty(&ieee->crypt_deinit_list)) {
71 pr_debug("entries remaining in delayed crypt deletion list\n");
72 ieee->crypt_deinit_timer.expires = jiffies + HZ;
73 add_timer(&ieee->crypt_deinit_timer);
75 spin_unlock_irqrestore(&ieee->lock, flags);
79 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
80 struct ieee80211_crypt_data **crypt)
82 struct ieee80211_crypt_data *tmp;
91 /* must not run ops->deinit() while there may be pending encrypt or
92 * decrypt operations. Use a list of delayed deinits to avoid needing
95 spin_lock_irqsave(&ieee->lock, flags);
96 list_add(&tmp->list, &ieee->crypt_deinit_list);
97 if (!timer_pending(&ieee->crypt_deinit_timer)) {
98 ieee->crypt_deinit_timer.expires = jiffies + HZ;
99 add_timer(&ieee->crypt_deinit_timer);
101 spin_unlock_irqrestore(&ieee->lock, flags);
104 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
107 struct ieee80211_crypto_alg *alg;
112 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
118 spin_lock_irqsave(&hcrypt->lock, flags);
119 list_add(&alg->list, &hcrypt->algs);
120 spin_unlock_irqrestore(&hcrypt->lock, flags);
122 pr_debug("registered algorithm '%s'\n", ops->name);
127 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
130 struct list_head *ptr;
131 struct ieee80211_crypto_alg *del_alg = NULL;
136 spin_lock_irqsave(&hcrypt->lock, flags);
137 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
138 struct ieee80211_crypto_alg *alg =
139 (struct ieee80211_crypto_alg *) ptr;
140 if (alg->ops == ops) {
141 list_del(&alg->list);
146 spin_unlock_irqrestore(&hcrypt->lock, flags);
149 pr_debug("unregistered algorithm '%s'\n", ops->name);
153 return del_alg ? 0 : -1;
157 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
160 struct list_head *ptr;
161 struct ieee80211_crypto_alg *found_alg = NULL;
166 spin_lock_irqsave(&hcrypt->lock, flags);
167 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
168 struct ieee80211_crypto_alg *alg =
169 (struct ieee80211_crypto_alg *) ptr;
170 if (strcmp(alg->ops->name, name) == 0) {
175 spin_unlock_irqrestore(&hcrypt->lock, flags);
178 return found_alg->ops;
184 static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
185 static void ieee80211_crypt_null_deinit(void *priv) {}
187 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
189 .init = ieee80211_crypt_null_init,
190 .deinit = ieee80211_crypt_null_deinit,
191 .encrypt_mpdu = NULL,
192 .decrypt_mpdu = NULL,
193 .encrypt_msdu = NULL,
194 .decrypt_msdu = NULL,
197 .extra_prefix_len = 0,
198 .extra_postfix_len = 0,
199 .owner = THIS_MODULE,
203 int ieee80211_crypto_init(void)
207 hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
211 INIT_LIST_HEAD(&hcrypt->algs);
212 spin_lock_init(&hcrypt->lock);
214 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
224 void ieee80211_crypto_deinit(void)
226 struct list_head *ptr, *n;
227 struct ieee80211_crypto_alg *alg = NULL;
232 list_for_each_safe(ptr, n, &hcrypt->algs) {
233 alg = list_entry(ptr, struct ieee80211_crypto_alg, list);
236 pr_debug("unregistered algorithm '%s' (deinit)\n",