drivers/staging/vt6656/key.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  *
  20  * File: key.c
  21  *
  22  * Purpose: Implement functions for 802.11i Key management
  23  *
  24  * Author: Jerry Chen
  25  *
  26  * Date: May 29, 2003
  27  *
  28  * Functions:
  29  *
  30  * Revision History:
  31  *
  32  */
  33
  34 #include "mac.h"
  35 #include "key.h"
  36 #include "usbpipe.h"
  37
  38 int vnt_key_init_table(struct vnt_private *priv)
  39 {
  40         u8 i;
  41         u8 data[MAX_KEY_TABLE];
  42
  43         for (i = 0; i < MAX_KEY_TABLE; i++)
  44                 data[i] = i;
  45
  46         return vnt_control_out(priv, MESSAGE_TYPE_CLRKEYENTRY,
  47                         0, 0, ARRAY_SIZE(data), data);
  48 }
  49
  50 static int vnt_set_keymode(struct ieee80211_hw *hw, u8 *mac_addr,
  51         struct ieee80211_key_conf *key, u32 key_type, u32 mode,
  52         bool onfly_latch)
  53 {
  54         struct vnt_private *priv = hw->priv;
  55         u8 broadcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  56         u16 key_mode = 0;
  57         u32 entry = 0;
  58         u8 *bssid;
  59         u8 key_inx = key->keyidx;
  60         u8 i;
  61
  62         if (mac_addr)
  63                 bssid = mac_addr;
  64         else
  65                 bssid = &broadcast[0];
  66
  67         if (key_type != VNT_KEY_DEFAULTKEY) {
  68                 for (i = 0; i < (MAX_KEY_TABLE - 1); i++) {
  69                         if (!test_bit(i, &priv->key_entry_inuse)) {
  70                                 set_bit(i, &priv->key_entry_inuse);
  71
  72                                 key->hw_key_idx = i;
  73                                 entry = key->hw_key_idx;
  74                                 break;
  75                         }
  76                 }
  77         }
  78
  79         switch (key_type) {
  80                 /* fallthrough */
  81         case VNT_KEY_DEFAULTKEY:
  82                 /* default key last entry */
  83                 entry = MAX_KEY_TABLE - 1;
  84                 key->hw_key_idx = entry;
  85         case VNT_KEY_ALLGROUP:
  86                 key_mode |= VNT_KEY_ALLGROUP;
  87                 if (onfly_latch)
  88                         key_mode |= VNT_KEY_ONFLY_ALL;
  89         case VNT_KEY_GROUP_ADDRESS:
  90                 key_mode |= mode;
  91         case VNT_KEY_GROUP:
  92                 key_mode |= (mode << 4);
  93                 key_mode |= VNT_KEY_GROUP;
  94                 break;
  95         case  VNT_KEY_PAIRWISE:
  96                 key_mode |= mode;
  97                 key_inx = 4;
  98                 /* Don't save entry for pairwise key for station mode */
  99                 if (priv->op_mode == NL80211_IFTYPE_STATION)
 100                         clear_bit(entry, &priv->key_entry_inuse);
 101                 break;
 102         default:
 103                 return -EINVAL;
 104         }
 105
 106         if (onfly_latch)
 107                 key_mode |= VNT_KEY_ONFLY;
 108
 109         if (mode == KEY_CTL_WEP) {
 110                 if (key->keylen == WLAN_KEY_LEN_WEP40)
 111                         key->key[15] &= 0x7f;
 112                 if (key->keylen == WLAN_KEY_LEN_WEP104)
 113                         key->key[15] |= 0x80;
 114         }
 115
 116         vnt_mac_set_keyentry(priv, key_mode, entry, key_inx, bssid, key->key);
 117
 118         return 0;
 119 }
 120
 121 int vnt_set_keys(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 122         struct ieee80211_vif *vif, struct ieee80211_key_conf *key)
 123 {
 124         struct ieee80211_bss_conf *conf = &vif->bss_conf;
 125         struct vnt_private *priv = hw->priv;
 126         u8 *mac_addr = NULL;
 127         u8 key_dec_mode = 0;
 128         int ret = 0, u;
 129
 130         if (sta)
 131                 mac_addr = &sta->addr[0];
 132
 133         switch (key->cipher) {
 134         case 0:
 135                 for (u = 0 ; u < MAX_KEY_TABLE; u++)
 136                         vnt_mac_disable_keyentry(priv, u);
 137                 return ret;
 138
 139         case WLAN_CIPHER_SUITE_WEP40:
 140         case WLAN_CIPHER_SUITE_WEP104:
 141                 for (u = 0; u < MAX_KEY_TABLE; u++)
 142                         vnt_mac_disable_keyentry(priv, u);
 143
 144                 vnt_set_keymode(hw, mac_addr, key, VNT_KEY_DEFAULTKEY,
 145                         KEY_CTL_WEP, true);
 146
 147                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 148
 149                 return ret;
 150         case WLAN_CIPHER_SUITE_TKIP:
 151                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 152                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 153
 154                 key_dec_mode = KEY_CTL_TKIP;
 155
 156                 break;
 157         case WLAN_CIPHER_SUITE_CCMP:
 158                 if (priv->local_id <= MAC_REVISION_A1)
 159                         return -EINVAL;
 160
 161                 key_dec_mode = KEY_CTL_CCMP;
 162
 163                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 164         }
 165
 166
 167         if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE) {
 168                 vnt_set_keymode(hw, mac_addr, key, VNT_KEY_PAIRWISE,
 169                                         key_dec_mode, true);
 170         } else {
 171                 vnt_set_keymode(hw, mac_addr, key, VNT_KEY_DEFAULTKEY,
 172                                                 key_dec_mode, true);
 173
 174                 vnt_set_keymode(hw, (u8 *)conf->bssid, key,
 175                         VNT_KEY_GROUP_ADDRESS, key_dec_mode, true);
 176         }
 177
 178         return 0;
 179 }