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/slab.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
22 #include "ieee80211.h"
24 MODULE_AUTHOR("Jouni Malinen");
25 MODULE_DESCRIPTION("HostAP crypto");
26 MODULE_LICENSE("GPL");
28 struct ieee80211_crypto_alg {
29 struct list_head list;
30 struct ieee80211_crypto_ops *ops;
34 struct ieee80211_crypto {
35 struct list_head algs;
39 static struct ieee80211_crypto *hcrypt;
41 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
43 struct list_head *ptr, *n;
44 struct ieee80211_crypt_data *entry;
46 for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
47 ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
48 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
50 if (atomic_read(&entry->refcnt) != 0 && !force)
56 entry->ops->deinit(entry->priv);
61 void ieee80211_crypt_deinit_handler(unsigned long data)
63 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
66 spin_lock_irqsave(&ieee->lock, flags);
67 ieee80211_crypt_deinit_entries(ieee, 0);
68 if (!list_empty(&ieee->crypt_deinit_list)) {
69 pr_debug("entries remaining in delayed crypt deletion list\n");
70 ieee->crypt_deinit_timer.expires = jiffies + HZ;
71 add_timer(&ieee->crypt_deinit_timer);
73 spin_unlock_irqrestore(&ieee->lock, flags);
77 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
78 struct ieee80211_crypt_data **crypt)
80 struct ieee80211_crypt_data *tmp;
89 /* must not run ops->deinit() while there may be pending encrypt or
90 * decrypt operations. Use a list of delayed deinits to avoid needing
93 spin_lock_irqsave(&ieee->lock, flags);
94 list_add(&tmp->list, &ieee->crypt_deinit_list);
95 if (!timer_pending(&ieee->crypt_deinit_timer)) {
96 ieee->crypt_deinit_timer.expires = jiffies + HZ;
97 add_timer(&ieee->crypt_deinit_timer);
99 spin_unlock_irqrestore(&ieee->lock, flags);
102 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
105 struct ieee80211_crypto_alg *alg;
110 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
116 spin_lock_irqsave(&hcrypt->lock, flags);
117 list_add(&alg->list, &hcrypt->algs);
118 spin_unlock_irqrestore(&hcrypt->lock, flags);
120 pr_debug("registered algorithm '%s'\n", ops->name);
125 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
128 struct list_head *ptr;
129 struct ieee80211_crypto_alg *del_alg = NULL;
134 spin_lock_irqsave(&hcrypt->lock, flags);
135 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
136 struct ieee80211_crypto_alg *alg =
137 (struct ieee80211_crypto_alg *) ptr;
138 if (alg->ops == ops) {
139 list_del(&alg->list);
144 spin_unlock_irqrestore(&hcrypt->lock, flags);
147 pr_debug("unregistered algorithm '%s'\n", ops->name);
151 return del_alg ? 0 : -1;
155 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
158 struct list_head *ptr;
159 struct ieee80211_crypto_alg *found_alg = NULL;
164 spin_lock_irqsave(&hcrypt->lock, flags);
165 for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
166 struct ieee80211_crypto_alg *alg =
167 (struct ieee80211_crypto_alg *) ptr;
168 if (strcmp(alg->ops->name, name) == 0) {
173 spin_unlock_irqrestore(&hcrypt->lock, flags);
176 return found_alg->ops;
182 static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
183 static void ieee80211_crypt_null_deinit(void *priv) {}
185 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
187 .init = ieee80211_crypt_null_init,
188 .deinit = ieee80211_crypt_null_deinit,
189 .encrypt_mpdu = NULL,
190 .decrypt_mpdu = NULL,
191 .encrypt_msdu = NULL,
192 .decrypt_msdu = NULL,
195 .extra_prefix_len = 0,
196 .extra_postfix_len = 0,
197 .owner = THIS_MODULE,
201 int ieee80211_crypto_init(void)
205 hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
209 INIT_LIST_HEAD(&hcrypt->algs);
210 spin_lock_init(&hcrypt->lock);
212 ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
222 void ieee80211_crypto_deinit(void)
224 struct list_head *ptr, *n;
225 struct ieee80211_crypto_alg *alg = NULL;
230 list_for_each_safe(ptr, n, &hcrypt->algs) {
231 alg = list_entry(ptr, struct ieee80211_crypto_alg, list);
234 pr_debug("unregistered algorithm '%s' (deinit)\n",