Pileus Git - ~andy/linux/blob - 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/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22
  23 #include "ieee80211.h"
  24
  25 MODULE_AUTHOR("Jouni Malinen");
  26 MODULE_DESCRIPTION("HostAP crypto");
  27 MODULE_LICENSE("GPL");
  28
  29 struct ieee80211_crypto_alg {
  30         struct list_head list;
  31         struct ieee80211_crypto_ops *ops;
  32 };
  33
  34
  35 struct ieee80211_crypto {
  36         struct list_head algs;
  37         spinlock_t lock;
  38 };
  39
  40 static struct ieee80211_crypto *hcrypt;
  41
  42 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee,
  43                                            int force)
  44 {
  45         struct list_head *ptr, *n;
  46         struct ieee80211_crypt_data *entry;
  47
  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);
  51
  52                 if (atomic_read(&entry->refcnt) != 0 && !force)
  53                         continue;
  54
  55                 list_del(ptr);
  56
  57                 if (entry->ops)
  58                         entry->ops->deinit(entry->priv);
  59                 kfree(entry);
  60         }
  61 }
  62
  63 void ieee80211_crypt_deinit_handler(unsigned long data)
  64 {
  65         struct ieee80211_device *ieee = (struct ieee80211_device *)data;
  66         unsigned long flags;
  67
  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);
  74         }
  75         spin_unlock_irqrestore(&ieee->lock, flags);
  76
  77 }
  78
  79 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
  80                                     struct ieee80211_crypt_data **crypt)
  81 {
  82         struct ieee80211_crypt_data *tmp;
  83         unsigned long flags;
  84
  85         if (*crypt == NULL)
  86                 return;
  87
  88         tmp = *crypt;
  89         *crypt = NULL;
  90
  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
  93          * locking. */
  94
  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);
 100         }
 101         spin_unlock_irqrestore(&ieee->lock, flags);
 102 }
 103
 104 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
 105 {
 106         unsigned long flags;
 107         struct ieee80211_crypto_alg *alg;
 108
 109         if (hcrypt == NULL)
 110                 return -1;
 111
 112         alg = kzalloc(sizeof(*alg), GFP_KERNEL);
 113         if (alg == NULL)
 114                 return -ENOMEM;
 115
 116         alg->ops = ops;
 117
 118         spin_lock_irqsave(&hcrypt->lock, flags);
 119         list_add(&alg->list, &hcrypt->algs);
 120         spin_unlock_irqrestore(&hcrypt->lock, flags);
 121
 122         pr_debug("registered algorithm '%s'\n", ops->name);
 123
 124         return 0;
 125 }
 126
 127 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
 128 {
 129         unsigned long flags;
 130         struct list_head *ptr;
 131         struct ieee80211_crypto_alg *del_alg = NULL;
 132
 133         if (hcrypt == NULL)
 134                 return -1;
 135
 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);
 142                         del_alg = alg;
 143                         break;
 144                 }
 145         }
 146         spin_unlock_irqrestore(&hcrypt->lock, flags);
 147
 148         if (del_alg) {
 149                 pr_debug("unregistered algorithm '%s'\n", ops->name);
 150                 kfree(del_alg);
 151         }
 152
 153         return del_alg ? 0 : -1;
 154 }
 155
 156
 157 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
 158 {
 159         unsigned long flags;
 160         struct list_head *ptr;
 161         struct ieee80211_crypto_alg *found_alg = NULL;
 162
 163         if (hcrypt == NULL)
 164                 return NULL;
 165
 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) {
 171                         found_alg = alg;
 172                         break;
 173                 }
 174         }
 175         spin_unlock_irqrestore(&hcrypt->lock, flags);
 176
 177         if (found_alg)
 178                 return found_alg->ops;
 179         else
 180                 return NULL;
 181 }
 182
 183
 184 static void *ieee80211_crypt_null_init(int keyidx) { return (void *) 1; }
 185 static void ieee80211_crypt_null_deinit(void *priv) {}
 186
 187 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
 188         .name                   = "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,
 195         .set_key                = NULL,
 196         .get_key                = NULL,
 197         .extra_prefix_len       = 0,
 198         .extra_postfix_len      = 0,
 199         .owner                  = THIS_MODULE,
 200 };
 201
 202
 203 int ieee80211_crypto_init(void)
 204 {
 205         int ret = -ENOMEM;
 206
 207         hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL);
 208         if (!hcrypt)
 209                 goto out;
 210
 211         INIT_LIST_HEAD(&hcrypt->algs);
 212         spin_lock_init(&hcrypt->lock);
 213
 214         ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
 215         if (ret < 0) {
 216                 kfree(hcrypt);
 217                 hcrypt = NULL;
 218         }
 219 out:
 220         return ret;
 221 }
 222
 223
 224 void ieee80211_crypto_deinit(void)
 225 {
 226         struct list_head *ptr, *n;
 227         struct ieee80211_crypto_alg *alg = NULL;
 228
 229         if (hcrypt == NULL)
 230                 return;
 231
 232         list_for_each_safe(ptr, n, &hcrypt->algs) {
 233                 alg = list_entry(ptr, struct ieee80211_crypto_alg, list);
 234                 if (alg) {
 235                         list_del(ptr);
 236                         pr_debug("unregistered algorithm '%s' (deinit)\n",
 237                                  alg->ops->name);
 238                         kfree(alg);
 239                 }
 240         }
 241         kfree(hcrypt);
 242 }