Root/drivers/staging/rtl8192e/rtllib_crypt.c

1/*
2 * Host AP crypto routines
3 *
4 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
6 *
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
10 * more details.
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19
20#include "rtllib.h"
21
22struct rtllib_crypto_alg {
23    struct list_head list;
24    struct lib80211_crypto_ops *ops;
25};
26
27
28struct rtllib_crypto {
29    struct list_head algs;
30    spinlock_t lock;
31};
32
33static struct rtllib_crypto *hcrypt;
34
35void rtllib_crypt_deinit_entries(struct lib80211_crypt_info *info,
36                       int force)
37{
38    struct list_head *ptr, *n;
39    struct lib80211_crypt_data *entry;
40
41    for (ptr = info->crypt_deinit_list.next, n = ptr->next;
42         ptr != &info->crypt_deinit_list; ptr = n, n = ptr->next) {
43        entry = list_entry(ptr, struct lib80211_crypt_data, list);
44
45        if (atomic_read(&entry->refcnt) != 0 && !force)
46            continue;
47
48        list_del(ptr);
49
50        if (entry->ops)
51            entry->ops->deinit(entry->priv);
52        kfree(entry);
53    }
54}
55EXPORT_SYMBOL(rtllib_crypt_deinit_entries);
56
57void rtllib_crypt_deinit_handler(unsigned long data)
58{
59    struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data;
60    unsigned long flags;
61
62    spin_lock_irqsave(info->lock, flags);
63    rtllib_crypt_deinit_entries(info, 0);
64    if (!list_empty(&info->crypt_deinit_list)) {
65        printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
66               "deletion list\n", info->name);
67        info->crypt_deinit_timer.expires = jiffies + HZ;
68        add_timer(&info->crypt_deinit_timer);
69    }
70    spin_unlock_irqrestore(info->lock, flags);
71
72}
73EXPORT_SYMBOL(rtllib_crypt_deinit_handler);
74
75void rtllib_crypt_delayed_deinit(struct lib80211_crypt_info *info,
76                 struct lib80211_crypt_data **crypt)
77{
78    struct lib80211_crypt_data *tmp;
79    unsigned long flags;
80
81    if (*crypt == NULL)
82        return;
83
84    tmp = *crypt;
85    *crypt = NULL;
86
87    /* must not run ops->deinit() while there may be pending encrypt or
88     * decrypt operations. Use a list of delayed deinits to avoid needing
89     * locking. */
90
91    spin_lock_irqsave(info->lock, flags);
92    list_add(&tmp->list, &info->crypt_deinit_list);
93    if (!timer_pending(&info->crypt_deinit_timer)) {
94        info->crypt_deinit_timer.expires = jiffies + HZ;
95        add_timer(&info->crypt_deinit_timer);
96    }
97    spin_unlock_irqrestore(info->lock, flags);
98}
99EXPORT_SYMBOL(rtllib_crypt_delayed_deinit);
100
101int rtllib_register_crypto_ops(struct lib80211_crypto_ops *ops)
102{
103    unsigned long flags;
104    struct rtllib_crypto_alg *alg;
105
106    if (hcrypt == NULL)
107        return -1;
108
109    alg = kzalloc(sizeof(*alg), GFP_KERNEL);
110    if (alg == NULL)
111        return -ENOMEM;
112
113    alg->ops = ops;
114
115    spin_lock_irqsave(&hcrypt->lock, flags);
116    list_add(&alg->list, &hcrypt->algs);
117    spin_unlock_irqrestore(&hcrypt->lock, flags);
118
119    printk(KERN_DEBUG "rtllib_crypt: registered algorithm '%s'\n",
120           ops->name);
121
122    return 0;
123}
124EXPORT_SYMBOL(rtllib_register_crypto_ops);
125
126int rtllib_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
127{
128    unsigned long flags;
129    struct list_head *ptr;
130    struct rtllib_crypto_alg *del_alg = NULL;
131
132    if (hcrypt == NULL)
133        return -1;
134
135    spin_lock_irqsave(&hcrypt->lock, flags);
136    for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
137        struct rtllib_crypto_alg *alg =
138            (struct rtllib_crypto_alg *) ptr;
139        if (alg->ops == ops) {
140            list_del(&alg->list);
141            del_alg = alg;
142            break;
143        }
144    }
145    spin_unlock_irqrestore(&hcrypt->lock, flags);
146
147    if (del_alg) {
148        printk(KERN_DEBUG "rtllib_crypt: unregistered algorithm "
149               "'%s'\n", ops->name);
150        kfree(del_alg);
151    }
152
153    return del_alg ? 0 : -1;
154}
155EXPORT_SYMBOL(rtllib_unregister_crypto_ops);
156
157
158struct lib80211_crypto_ops *rtllib_get_crypto_ops(const char *name)
159{
160    unsigned long flags;
161    struct list_head *ptr;
162    struct rtllib_crypto_alg *found_alg = NULL;
163
164    if (hcrypt == NULL)
165        return NULL;
166
167    spin_lock_irqsave(&hcrypt->lock, flags);
168    for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
169        struct rtllib_crypto_alg *alg =
170            (struct rtllib_crypto_alg *) ptr;
171        if (strcmp(alg->ops->name, name) == 0) {
172            found_alg = alg;
173            break;
174        }
175    }
176    spin_unlock_irqrestore(&hcrypt->lock, flags);
177
178    if (found_alg)
179        return found_alg->ops;
180    else
181        return NULL;
182}
183EXPORT_SYMBOL(rtllib_get_crypto_ops);
184
185
186static void * rtllib_crypt_null_init(int keyidx) { return (void *) 1; }
187static void rtllib_crypt_null_deinit(void *priv) {}
188
189static struct lib80211_crypto_ops rtllib_crypt_null = {
190    .name = "NULL",
191    .init = rtllib_crypt_null_init,
192    .deinit = rtllib_crypt_null_deinit,
193    .encrypt_mpdu = NULL,
194    .decrypt_mpdu = NULL,
195    .encrypt_msdu = NULL,
196    .decrypt_msdu = NULL,
197    .set_key = NULL,
198    .get_key = NULL,
199    .extra_mpdu_prefix_len = 0,
200    .extra_mpdu_postfix_len = 0,
201    .extra_msdu_prefix_len = 0,
202    .extra_msdu_postfix_len = 0,
203    .owner = THIS_MODULE,
204};
205
206
207int __init rtllib_crypto_init(void)
208{
209    int ret = -ENOMEM;
210
211    hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
212    if (!hcrypt)
213        goto out;
214
215    INIT_LIST_HEAD(&hcrypt->algs);
216    spin_lock_init(&hcrypt->lock);
217
218    ret = lib80211_register_crypto_ops(&rtllib_crypt_null);
219    if (ret < 0) {
220        kfree(hcrypt);
221        hcrypt = NULL;
222    }
223out:
224    return ret;
225}
226
227
228void __exit rtllib_crypto_deinit(void)
229{
230    struct list_head *ptr, *n;
231
232    if (hcrypt == NULL)
233        return;
234
235    for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
236         ptr = n, n = ptr->next) {
237        struct rtllib_crypto_alg *alg =
238            (struct rtllib_crypto_alg *) ptr;
239        list_del(ptr);
240        printk(KERN_DEBUG "rtllib_crypt: unregistered algorithm "
241               "'%s' (deinit)\n", alg->ops->name);
242        kfree(alg);
243    }
244
245    kfree(hcrypt);
246}
247
248module_init(rtllib_crypto_init);
249module_exit(rtllib_crypto_deinit);
250
251MODULE_LICENSE("GPL");
252

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