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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  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>
  21
  22 #include "ieee80211.h"
  23
  24 MODULE_AUTHOR("Jouni Malinen");
  25 MODULE_DESCRIPTION("HostAP crypto");
  26 MODULE_LICENSE("GPL");
  27
  28 struct ieee80211_crypto_alg {
  29         struct list_head list;
  30         struct ieee80211_crypto_ops *ops;
  31 };
  32
  33
  34 struct ieee80211_crypto {
  35         struct list_head algs;
  36         spinlock_t lock;
  37 };
  38
  39 static struct ieee80211_crypto *hcrypt;
  40
  41 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
  42 {
  43         struct list_head *ptr, *n;
  44         struct ieee80211_crypt_data *entry;
  45
  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);
  49
  50                 if (atomic_read(&entry->refcnt) != 0 && !force)
  51                         continue;
  52
  53                 list_del(ptr);
  54
  55                 if (entry->ops)
  56                         entry->ops->deinit(entry->priv);
  57                 kfree(entry);
  58         }
  59 }
  60
  61 void ieee80211_crypt_deinit_handler(unsigned long data)
  62 {
  63         struct ieee80211_device *ieee = (struct ieee80211_device *)data;
  64         unsigned long flags;
  65
  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);
  72         }
  73         spin_unlock_irqrestore(&ieee->lock, flags);
  74
  75 }
  76
  77 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
  78                                     struct ieee80211_crypt_data **crypt)
  79 {
  80         struct ieee80211_crypt_data *tmp;
  81         unsigned long flags;
  82
  83         if (*crypt == NULL)
  84                 return;
  85
  86         tmp = *crypt;
  87         *crypt = NULL;
  88
  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
  91          * locking. */
  92
  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);
  98         }
  99         spin_unlock_irqrestore(&ieee->lock, flags);
 100 }
 101
 102 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
 103 {
 104         unsigned long flags;
 105         struct ieee80211_crypto_alg *alg;
 106
 107         if (hcrypt == NULL)
 108                 return -1;
 109
 110         alg = kzalloc(sizeof(*alg), GFP_KERNEL);
 111         if (alg == NULL)
 112                 return -ENOMEM;
 113
 114         alg->ops = ops;
 115
 116         spin_lock_irqsave(&hcrypt->lock, flags);
 117         list_add(&alg->list, &hcrypt->algs);
 118         spin_unlock_irqrestore(&hcrypt->lock, flags);
 119
 120         pr_debug("registered algorithm '%s'\n", ops->name);
 121
 122         return 0;
 123 }
 124
 125 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
 126 {
 127         unsigned long flags;
 128         struct list_head *ptr;
 129         struct ieee80211_crypto_alg *del_alg = NULL;
 130
 131         if (hcrypt == NULL)
 132                 return -1;
 133
 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);
 140                         del_alg = alg;
 141                         break;
 142                 }
 143         }
 144         spin_unlock_irqrestore(&hcrypt->lock, flags);
 145
 146         if (del_alg) {
 147                 pr_debug("unregistered algorithm '%s'\n", ops->name);
 148                 kfree(del_alg);
 149         }
 150
 151         return del_alg ? 0 : -1;
 152 }
 153
 154
 155 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
 156 {
 157         unsigned long flags;
 158         struct list_head *ptr;
 159         struct ieee80211_crypto_alg *found_alg = NULL;
 160
 161         if (hcrypt == NULL)
 162                 return NULL;
 163
 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) {
 169                         found_alg = alg;
 170                         break;
 171                 }
 172         }
 173         spin_unlock_irqrestore(&hcrypt->lock, flags);
 174
 175         if (found_alg)
 176                 return found_alg->ops;
 177         else
 178                 return NULL;
 179 }
 180
 181
 182 static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
 183 static void ieee80211_crypt_null_deinit(void *priv) {}
 184
 185 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
 186         .name                   = "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,
 193         .set_key                = NULL,
 194         .get_key                = NULL,
 195         .extra_prefix_len       = 0,
 196         .extra_postfix_len      = 0,
 197         .owner                  = THIS_MODULE,
 198 };
 199
 200
 201 int ieee80211_crypto_init(void)
 202 {
 203         int ret = -ENOMEM;
 204
 205         hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
 206         if (!hcrypt)
 207                 goto out;
 208
 209         INIT_LIST_HEAD(&hcrypt->algs);
 210         spin_lock_init(&hcrypt->lock);
 211
 212         ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
 213         if (ret < 0) {
 214                 kfree(hcrypt);
 215                 hcrypt = NULL;
 216         }
 217 out:
 218         return ret;
 219 }
 220
 221
 222 void ieee80211_crypto_deinit(void)
 223 {
 224         struct list_head *ptr, *n;
 225         struct ieee80211_crypto_alg *alg = NULL;
 226
 227         if (hcrypt == NULL)
 228                 return;
 229
 230         list_for_each_safe(ptr, n, &hcrypt->algs) {
 231                 alg = list_entry(ptr, struct ieee80211_crypto_alg, list);
 232                 if (alg) {
 233                         list_del(ptr);
 234                         pr_debug("unregistered algorithm '%s' (deinit)\n",
 235                                  alg->ops->name);
 236                         kfree(alg);
 237                 }
 238         }
 239         kfree(hcrypt);
 240 }