drivers/staging/rtl8187se/ieee80211/ieee80211_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/config.h>
  15 #include <linux/version.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <asm/string.h>
  20 #include <asm/errno.h>
  21
  22 #if (LINUX_VERSION_CODE<KERNEL_VERSION(2,6,18))
  23 #include<linux/config.h>
  24 #endif
  25
  26 #include "ieee80211.h"
  27
  28 MODULE_AUTHOR("Jouni Malinen");
  29 MODULE_DESCRIPTION("HostAP crypto");
  30 MODULE_LICENSE("GPL");
  31
  32 struct ieee80211_crypto_alg {
  33         struct list_head list;
  34         struct ieee80211_crypto_ops *ops;
  35 };
  36
  37
  38 struct ieee80211_crypto {
  39         struct list_head algs;
  40         spinlock_t lock;
  41 };
  42
  43 static struct ieee80211_crypto *hcrypt;
  44
  45 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
  46                                            int force)
  47 {
  48         struct list_head *ptr, *n;
  49         struct ieee80211_crypt_data *entry;
  50
  51         for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
  52              ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
  53                 entry = list_entry(ptr, struct ieee80211_crypt_data, list);
  54
  55                 if (atomic_read(&entry->refcnt) != 0 && !force)
  56                         continue;
  57
  58                 list_del(ptr);
  59
  60                 if (entry->ops) {
  61                         entry->ops->deinit(entry->priv);
  62                         module_put(entry->ops->owner);
  63                 }
  64                 kfree(entry);
  65         }
  66 }
  67
  68 void ieee80211_crypt_deinit_handler(unsigned long data)
  69 {
  70         struct ieee80211_device *ieee = (struct ieee80211_device *)data;
  71         unsigned long flags;
  72
  73         spin_lock_irqsave(&ieee->lock, flags);
  74         ieee80211_crypt_deinit_entries(ieee, 0);
  75         if (!list_empty(&ieee->crypt_deinit_list)) {
  76                 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
  77                        "deletion list\n", ieee->dev->name);
  78                 ieee->crypt_deinit_timer.expires = jiffies + HZ;
  79                 add_timer(&ieee->crypt_deinit_timer);
  80         }
  81         spin_unlock_irqrestore(&ieee->lock, flags);
  82
  83 }
  84
  85 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
  86                                     struct ieee80211_crypt_data **crypt)
  87 {
  88         struct ieee80211_crypt_data *tmp;
  89         unsigned long flags;
  90
  91         if (*crypt == NULL)
  92                 return;
  93
  94         tmp = *crypt;
  95         *crypt = NULL;
  96
  97         /* must not run ops->deinit() while there may be pending encrypt or
  98          * decrypt operations. Use a list of delayed deinits to avoid needing
  99          * locking. */
 100
 101         spin_lock_irqsave(&ieee->lock, flags);
 102         list_add(&tmp->list, &ieee->crypt_deinit_list);
 103         if (!timer_pending(&ieee->crypt_deinit_timer)) {
 104                 ieee->crypt_deinit_timer.expires = jiffies + HZ;
 105                 add_timer(&ieee->crypt_deinit_timer);
 106         }
 107         spin_unlock_irqrestore(&ieee->lock, flags);
 108 }
 109
 110 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
 111 {
 112         unsigned long flags;
 113         struct ieee80211_crypto_alg *alg;
 114
 115         if (hcrypt == NULL)
 116                 return -1;
 117
 118         alg = kmalloc(sizeof(*alg), GFP_KERNEL);
 119         if (alg == NULL)
 120                 return -ENOMEM;
 121
 122         memset(alg, 0, sizeof(*alg));
 123         alg->ops = ops;
 124
 125         spin_lock_irqsave(&hcrypt->lock, flags);
 126         list_add(&alg->list, &hcrypt->algs);
 127         spin_unlock_irqrestore(&hcrypt->lock, flags);
 128
 129         printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
 130                ops->name);
 131
 132         return 0;
 133 }
 134
 135 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
 136 {
 137         unsigned long flags;
 138         struct list_head *ptr;
 139         struct ieee80211_crypto_alg *del_alg = NULL;
 140
 141         if (hcrypt == NULL)
 142                 return -1;
 143
 144         spin_lock_irqsave(&hcrypt->lock, flags);
 145         for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
 146                 struct ieee80211_crypto_alg *alg =
 147                         (struct ieee80211_crypto_alg *) ptr;
 148                 if (alg->ops == ops) {
 149                         list_del(&alg->list);
 150                         del_alg = alg;
 151                         break;
 152                 }
 153         }
 154         spin_unlock_irqrestore(&hcrypt->lock, flags);
 155
 156         if (del_alg) {
 157                 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
 158                        "'%s'\n", ops->name);
 159                 kfree(del_alg);
 160         }
 161
 162         return del_alg ? 0 : -1;
 163 }
 164
 165
 166 struct ieee80211_crypto_ops * ieee80211_get_crypto_ops(const char *name)
 167 {
 168         unsigned long flags;
 169         struct list_head *ptr;
 170         struct ieee80211_crypto_alg *found_alg = NULL;
 171
 172         if (hcrypt == NULL)
 173                 return NULL;
 174
 175         spin_lock_irqsave(&hcrypt->lock, flags);
 176         for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
 177                 struct ieee80211_crypto_alg *alg =
 178                         (struct ieee80211_crypto_alg *) ptr;
 179                 if (strcmp(alg->ops->name, name) == 0) {
 180                         found_alg = alg;
 181                         break;
 182                 }
 183         }
 184         spin_unlock_irqrestore(&hcrypt->lock, flags);
 185
 186         if (found_alg)
 187                 return found_alg->ops;
 188         else
 189                 return NULL;
 190 }
 191
 192
 193 static void * ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
 194 static void ieee80211_crypt_null_deinit(void *priv) {}
 195
 196 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
 197         .name                   = "NULL",
 198         .init                   = ieee80211_crypt_null_init,
 199         .deinit                 = ieee80211_crypt_null_deinit,
 200         .encrypt_mpdu           = NULL,
 201         .decrypt_mpdu           = NULL,
 202         .encrypt_msdu           = NULL,
 203         .decrypt_msdu           = NULL,
 204         .set_key                = NULL,
 205         .get_key                = NULL,
 206         .extra_prefix_len       = 0,
 207         .extra_postfix_len      = 0,
 208         .owner                  = THIS_MODULE,
 209 };
 210
 211
 212 int ieee80211_crypto_init(void)
 213 {
 214         int ret = -ENOMEM;
 215
 216         hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
 217         if (!hcrypt)
 218                 goto out;
 219
 220         memset(hcrypt, 0, sizeof(*hcrypt));
 221         INIT_LIST_HEAD(&hcrypt->algs);
 222         spin_lock_init(&hcrypt->lock);
 223
 224         ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
 225         if (ret < 0) {
 226                 kfree(hcrypt);
 227                 hcrypt = NULL;
 228         }
 229 out:
 230         return ret;
 231 }
 232
 233
 234 void ieee80211_crypto_deinit(void)
 235 {
 236         struct list_head *ptr, *n;
 237
 238         if (hcrypt == NULL)
 239                 return;
 240
 241         for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
 242              ptr = n, n = ptr->next) {
 243                 struct ieee80211_crypto_alg *alg =
 244                         (struct ieee80211_crypto_alg *) ptr;
 245                 list_del(ptr);
 246                 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
 247                        "'%s' (deinit)\n", alg->ops->name);
 248                 kfree(alg);
 249         }
 250
 251         kfree(hcrypt);
 252 }
 253
 254 #if 0
 255 EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
 256 EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
 257 EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
 258
 259 EXPORT_SYMBOL(ieee80211_register_crypto_ops);
 260 EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
 261 EXPORT_SYMBOL(ieee80211_get_crypto_ops);
 262 #endif
 263
 264 //module_init(ieee80211_crypto_init);
 265 //module_exit(ieee80211_crypto_deinit);