drivers/staging/vt6656/key.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   4  * All rights reserved.
   5  *
   6  * Purpose: Implement functions for 802.11i Key management
   7  *
   8  * Author: Jerry Chen
   9  *
  10  * Date: May 29, 2003
  11  *
  12  * Functions:
  13  *
  14  * Revision History:
  15  *
  16  */
  17
  18 #include "mac.h"
  19 #include "key.h"
  20 #include "usbpipe.h"
  21
  22 int vnt_key_init_table(struct vnt_private *priv)
  23 {
  24         u8 i;
  25         u8 data[MAX_KEY_TABLE];
  26
  27         for (i = 0; i < MAX_KEY_TABLE; i++)
  28                 data[i] = i;
  29
  30         return vnt_control_out(priv, MESSAGE_TYPE_CLRKEYENTRY,
  31                         0, 0, ARRAY_SIZE(data), data);
  32 }
  33
  34 static int vnt_set_keymode(struct ieee80211_hw *hw, u8 *mac_addr,
  35                            struct ieee80211_key_conf *key, u32 key_type,
  36                            u32 mode)
  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         case VNT_KEY_DEFAULTKEY:
  65                 /* default key last entry */
  66                 entry = MAX_KEY_TABLE - 1;
  67                 key->hw_key_idx = entry;
  68                 fallthrough;
  69         case VNT_KEY_GROUP_ADDRESS:
  70                 key_mode = mode | (mode << 4);
  71                 break;
  72         case VNT_KEY_GROUP:
  73                 key_mode = mode << 4;
  74                 break;
  75         case  VNT_KEY_PAIRWISE:
  76                 key_mode |= mode;
  77                 key_inx = 4;
  78                 break;
  79         default:
  80                 return -EINVAL;
  81         }
  82
  83         key_mode |= key_type;
  84
  85         if (mode == KEY_CTL_WEP) {
  86                 if (key->keylen == WLAN_KEY_LEN_WEP40)
  87                         key->key[15] &= 0x7f;
  88                 if (key->keylen == WLAN_KEY_LEN_WEP104)
  89                         key->key[15] |= 0x80;
  90         }
  91
  92         return vnt_mac_set_keyentry(priv, key_mode, entry,
  93                                     key_inx, bssid, key->key);
  94 }
  95
  96 int vnt_set_keys(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
  97                  struct ieee80211_vif *vif, struct ieee80211_key_conf *key)
  98 {
  99         struct vnt_private *priv = hw->priv;
 100         u8 *mac_addr = NULL;
 101         u8 key_dec_mode = 0;
 102
 103         if (sta)
 104                 mac_addr = &sta->addr[0];
 105
 106         switch (key->cipher) {
 107         case WLAN_CIPHER_SUITE_WEP40:
 108         case WLAN_CIPHER_SUITE_WEP104:
 109                 vnt_set_keymode(hw, mac_addr, key, VNT_KEY_DEFAULTKEY,
 110                                 KEY_CTL_WEP);
 111
 112                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 113
 114                 return vnt_set_keymode(hw, mac_addr, key, VNT_KEY_DEFAULTKEY,
 115                                        KEY_CTL_WEP);
 116
 117         case WLAN_CIPHER_SUITE_TKIP:
 118                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 119                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 120
 121                 key_dec_mode = KEY_CTL_TKIP;
 122
 123                 break;
 124         case WLAN_CIPHER_SUITE_CCMP:
 125                 if (priv->local_id <= MAC_REVISION_A1)
 126                         return -EOPNOTSUPP;
 127
 128                 key_dec_mode = KEY_CTL_CCMP;
 129
 130                 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 131                 break;
 132         default:
 133                 return -EOPNOTSUPP;
 134         }
 135
 136         if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 137                 return vnt_set_keymode(hw, mac_addr, key, VNT_KEY_PAIRWISE,
 138                                        key_dec_mode);
 139
 140         return vnt_set_keymode(hw, mac_addr, key,
 141                                 VNT_KEY_GROUP_ADDRESS, key_dec_mode);
 142 }