drivers/staging/vt6655/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  */
  29
  30 #include "tmacro.h"
  31 #include "key.h"
  32 #include "mac.h"
  33
  34 static int vnt_set_keymode(struct ieee80211_hw *hw, u8 *mac_addr,
  35         struct ieee80211_key_conf *key, u32 key_type, u32 mode,
  36         bool onfly_latch)
  37 {
  38         struct vnt_private *priv = hw->priv;
  39         u8 broadcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  40         u16 key_mode = 0;
  41         u32 entry = 0;
  42         u8 *bssid;
  43         u8 key_inx = key->keyidx;
  44         u8 i;
  45
  46         if (mac_addr)
  47                 bssid = mac_addr;
  48         else
  49                 bssid = &broadcast[0];
  50
  51         if (key_type != VNT_KEY_DEFAULTKEY) {
  52                 for (i = 0; i < (MAX_KEY_TABLE - 1); i++) {
  53                         if (!test_bit(i, &priv->key_entry_inuse)) {
  54                                 set_bit(i, &priv->key_entry_inuse);
  55
  56                                 key->hw_key_idx = i;
  57                                 entry = key->hw_key_idx;
  58                                 break;
  59                         }
  60                 }
  61         }
  62
  63         switch (key_type) {
  64         /* fallthrough */
  65         case VNT_KEY_DEFAULTKEY:
  66                 /* default key last entry */
  67                 entry = MAX_KEY_TABLE - 1;
  68                 key->hw_key_idx = entry;
  69         case VNT_KEY_ALLGROUP:
  70                 key_mode |= VNT_KEY_ALLGROUP;
  71                 if (onfly_latch)
  72                         key_mode |= VNT_KEY_ONFLY_ALL;
  73         case VNT_KEY_GROUP_ADDRESS:
  74                 key_mode |= mode;
  75         case VNT_KEY_GROUP:
  76                 key_mode |= (mode << 4);
  77                 key_mode |= VNT_KEY_GROUP;
  78                 break;
  79         case  VNT_KEY_PAIRWISE:
  80                 key_mode |= mode;
  81                 key_inx = 4;
  82                 break;
  83         default:
  84                 return -EINVAL;
  85         }
  86
  87         if (onfly_latch)
  88                 key_mode |= VNT_KEY_ONFLY;
  89
  90         if (mode == KEY_CTL_WEP) {
  91                 if (key->keylen == WLAN_KEY_LEN_WEP40)
  92                         key->key[15] &= 0x7f;
  93                 if (key->keylen == WLAN_KEY_LEN_WEP104)
  94                         key->key[15] |= 0x80;
  95         }
  96
  97         MACvSetKeyEntry(priv, key_mode, entry, key_inx,
  98                         bssid, (u32 *)key->key, priv->byLocalID);
  99
 100         return 0;
 101 }
 102
 103 int vnt_set_keys(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 104                  struct ieee80211_vif *vif, struct ieee80211_key_conf *key)
 105 {
 106         struct ieee80211_bss_conf *conf = &vif->bss_conf;
 107         struct vnt_private *priv = hw->priv;
 108         u8 *mac_addr = NULL;
 109         u8 key_dec_mode = 0;
 110         int ret = 0;
 111         u32 u;
 112
 113         if (sta)
 114                 mac_addr = &sta->addr[0];
 115
 116         switch (key->cipher) {
 117         case 0:
 118                 for (u = 0 ; u < MAX_KEY_TABLE; u++)
 119                         MACvDisableKeyEntry(priv, u);
 120                 return ret;
 121
 122         case WLAN_CIPHER_SUITE_WEP40:
 123         case WLAN_CIPHER_SUITE_WEP104:
 124                 for (u = 0; u < MAX_KEY_TABLE; u++)
 125                         MACvDisableKeyEntry(priv, u);
 126
 127                 vnt_set_keymode(hw, mac_addr,
 128                                 key, VNT_KEY_DEFAULTKEY, KEY_CTL_WEP, true);
 129
 130                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 131
 132                 return ret;
 133         case WLAN_CIPHER_SUITE_TKIP:
 134                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 135                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 136
 137                 key_dec_mode = KEY_CTL_TKIP;
 138
 139                 break;
 140         case WLAN_CIPHER_SUITE_CCMP:
 141                 key_dec_mode = KEY_CTL_CCMP;
 142
 143                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 144         }
 145
 146         if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE) {
 147                 vnt_set_keymode(hw, mac_addr,
 148                                 key, VNT_KEY_PAIRWISE, key_dec_mode, true);
 149         } else {
 150                 vnt_set_keymode(hw, mac_addr,
 151                                 key, VNT_KEY_DEFAULTKEY, key_dec_mode, true);
 152
 153                 vnt_set_keymode(hw, (u8 *)conf->bssid,
 154                                 key, VNT_KEY_GROUP_ADDRESS, key_dec_mode, true);
 155         }
 156
 157         return 0;
 158 }