drivers/staging/rtl8192ee/cam.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2010  Realtek Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * The full GNU General Public License is included in this distribution in the
  15  * file called LICENSE.
  16  *
  17  * Contact Information:
  18  * wlanfae <wlanfae@realtek.com>
  19  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  20  * Hsinchu 300, Taiwan.
  21  *
  22  * Larry Finger <Larry.Finger@lwfinger.net>
  23  *
  24  *****************************************************************************/
  25 #include "wifi.h"
  26 #include "cam.h"
  27
  28 void rtl92e_cam_reset_sec_info(struct ieee80211_hw *hw)
  29 {
  30         struct rtl_priv *rtlpriv = rtl_priv(hw);
  31
  32         rtlpriv->sec.use_defaultkey = false;
  33         rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
  34         rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
  35         memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
  36         memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
  37         rtlpriv->sec.pairwise_key = NULL;
  38 }
  39
  40 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
  41                                   u8 *mac_addr, u8 *key_cont_128, u16 us_config)
  42 {
  43         struct rtl_priv *rtlpriv = rtl_priv(hw);
  44
  45         u32 target_command;
  46         u32 target_content = 0;
  47         u8 entry_i;
  48
  49         RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content:",
  50                       key_cont_128, 16);
  51
  52         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
  53                 target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
  54                 target_command = target_command | BIT(31) | BIT(16);
  55
  56                 if (entry_i == 0) {
  57                         target_content = (u32) (*(mac_addr + 0)) << 16 |
  58                             (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
  59
  60                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  61                                         target_content);
  62                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  63                                         target_command);
  64
  65                         RT_TRACE(COMP_SEC, DBG_LOUD, "WRITE %x: %x\n",
  66                                  rtlpriv->cfg->maps[WCAMI], target_content);
  67                         RT_TRACE(COMP_SEC, DBG_LOUD, "The Key ID is %d\n",
  68                                  entry_no);
  69                         RT_TRACE(COMP_SEC, DBG_LOUD, "WRITE %x: %x\n",
  70                                  rtlpriv->cfg->maps[RWCAM], target_command);
  71                 } else if (entry_i == 1) {
  72                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  73                             (u32) (*(mac_addr + 4)) << 16 |
  74                             (u32) (*(mac_addr + 3)) << 8 |
  75                             (u32) (*(mac_addr + 2));
  76
  77                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  78                                         target_content);
  79                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  80                                         target_command);
  81
  82                         RT_TRACE(COMP_SEC, DBG_LOUD, "WRITE A4: %x\n",
  83                                  target_content);
  84                         RT_TRACE(COMP_SEC, DBG_LOUD, "WRITE A0: %x\n",
  85                                  target_command);
  86                 } else {
  87                         target_content =
  88                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
  89                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
  90                             << 16 |
  91                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
  92                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
  93
  94                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  95                                         target_content);
  96                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  97                                         target_command);
  98                         udelay(100);
  99
 100                         RT_TRACE(COMP_SEC, DBG_LOUD, "WRITE A4: %x\n",
 101                                  target_content);
 102                         RT_TRACE(COMP_SEC, DBG_LOUD, "WRITE A0: %x\n",
 103                                  target_command);
 104                 }
 105         }
 106
 107         RT_TRACE(COMP_SEC, DBG_LOUD, "after set key, usconfig:%x\n", us_config);
 108 }
 109
 110 u8 stg_rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 111                              u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 112                              u32 ul_default_key, u8 *key_content)
 113 {
 114         u32 us_config;
 115         struct rtl_priv *rtlpriv = rtl_priv(hw);
 116
 117         RT_TRACE(COMP_SEC, DBG_DMESG,
 118                  "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 119                  ul_entry_idx, ul_key_id, ul_enc_alg, ul_default_key, mac_addr);
 120
 121         if (ul_key_id == TOTAL_CAM_ENTRY) {
 122                 RT_TRACE(COMP_ERR, DBG_WARNING, "ulKeyId exceed!\n");
 123                 return 0;
 124         }
 125
 126         if (ul_default_key == 1)
 127                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 128         else
 129                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 130
 131         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 132                               (u8 *)key_content, us_config);
 133
 134         RT_TRACE(COMP_SEC, DBG_DMESG, "end\n");
 135
 136         return 1;
 137 }
 138 EXPORT_SYMBOL(stg_rtl_cam_add_one_entry);
 139
 140 int stg_rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 141                                  u8 *mac_addr, u32 ul_key_id)
 142 {
 143         u32 ul_command;
 144         struct rtl_priv *rtlpriv = rtl_priv(hw);
 145
 146         RT_TRACE(COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
 147
 148         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 149         ul_command = ul_command | BIT(31) | BIT(16);
 150
 151         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 152         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 153
 154         RT_TRACE(COMP_SEC, DBG_DMESG,
 155                  "stg_rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0);
 156         RT_TRACE(COMP_SEC, DBG_DMESG,
 157                  "stg_rtl_cam_delete_one_entry(): WRITE A0: %x\n",
 158                  ul_command);
 159         return 0;
 160 }
 161 EXPORT_SYMBOL(stg_rtl_cam_delete_one_entry);
 162
 163 void stg_rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 164 {
 165         u32 ul_command;
 166         struct rtl_priv *rtlpriv = rtl_priv(hw);
 167
 168         ul_command = BIT(31) | BIT(30);
 169         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 170 }
 171 EXPORT_SYMBOL(stg_rtl_cam_reset_all_entry);
 172
 173 void stg_rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 174 {
 175         struct rtl_priv *rtlpriv = rtl_priv(hw);
 176
 177         u32 ul_command;
 178         u32 ul_content;
 179         u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 180
 181         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 182         case WEP40_ENCRYPTION:
 183                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 184                 break;
 185         case WEP104_ENCRYPTION:
 186                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 187                 break;
 188         case TKIP_ENCRYPTION:
 189                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 190                 break;
 191         case AESCCMP_ENCRYPTION:
 192                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 193                 break;
 194         default:
 195                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 196         }
 197
 198         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 199
 200         ul_content |= BIT(15);
 201         ul_command = CAM_CONTENT_COUNT * uc_index;
 202         ul_command = ul_command | BIT(31) | BIT(16);
 203
 204         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 205         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 206
 207         RT_TRACE(COMP_SEC, DBG_DMESG,
 208                  "stg_rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content);
 209         RT_TRACE(COMP_SEC, DBG_DMESG,
 210                  "stg_rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command);
 211 }
 212 EXPORT_SYMBOL(stg_rtl_cam_mark_invalid);
 213
 214 void stg_rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 215 {
 216         struct rtl_priv *rtlpriv = rtl_priv(hw);
 217
 218         u32 ul_command;
 219         u32 ul_content;
 220         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 221         u8 entry_i;
 222
 223         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 224         case WEP40_ENCRYPTION:
 225                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 226                 break;
 227         case WEP104_ENCRYPTION:
 228                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 229                 break;
 230         case TKIP_ENCRYPTION:
 231                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 232                 break;
 233         case AESCCMP_ENCRYPTION:
 234                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 235                 break;
 236         default:
 237                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 238         }
 239
 240         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 241                 if (entry_i == 0) {
 242                         ul_content =
 243                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 244                         ul_content |= BIT(15);
 245
 246                 } else {
 247                         ul_content = 0;
 248                 }
 249
 250                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 251                 ul_command = ul_command | BIT(31) | BIT(16);
 252
 253                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 254                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 255
 256                 RT_TRACE(COMP_SEC, DBG_LOUD,
 257                          "stg_rtl_cam_empty_entry(): WRITE A4: %x\n",
 258                           ul_content);
 259                 RT_TRACE(COMP_SEC, DBG_LOUD,
 260                          "stg_rtl_cam_empty_entry(): WRITE A0: %x\n",
 261                          ul_command);
 262         }
 263 }
 264 EXPORT_SYMBOL(stg_rtl_cam_empty_entry);
 265
 266 u8 stg_rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 267 {
 268         struct rtl_priv *rtlpriv = rtl_priv(hw);
 269         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 270         u8 entry_idx = 0;
 271         u8 i, *addr;
 272
 273         if (!sta_addr) {
 274                 RT_TRACE(COMP_SEC, DBG_EMERG, "sta_addr is NULL\n");
 275                 return TOTAL_CAM_ENTRY;
 276         }
 277         /* Does STA already exist? */
 278         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 279                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 280                 if (memcmp(addr, sta_addr, ETH_ALEN) == 0)
 281                         return i;
 282         }
 283         /* Get a free CAM entry. */
 284         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 285                 if ((bitmap & BIT(0)) == 0) {
 286                         RT_TRACE(COMP_SEC, DBG_EMERG,
 287                                  "-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 288                                  rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
 289                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 290                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 291                                sta_addr, ETH_ALEN);
 292                         return entry_idx;
 293                 }
 294                 bitmap = bitmap >> 1;
 295         }
 296         return TOTAL_CAM_ENTRY;
 297 }
 298 EXPORT_SYMBOL(stg_rtl_cam_get_free_entry);
 299
 300 void stg_rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 301 {
 302         struct rtl_priv *rtlpriv = rtl_priv(hw);
 303         u32 bitmap;
 304         u8 i, *addr;
 305
 306         if (NULL == sta_addr) {
 307                 RT_TRACE(COMP_SEC, DBG_EMERG, "sta_addr is NULL\n");
 308                 return;
 309         }
 310
 311         if (is_zero_ether_addr(sta_addr)) {
 312                 RT_TRACE(COMP_SEC, DBG_EMERG,
 313                          "sta_addr is 00:00:00:00:00:00\n");
 314                 return;
 315         }
 316         /* Does STA already exist? */
 317         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 318                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 319                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 320                 if (((bitmap & BIT(0)) == BIT(0)) &&
 321                     (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
 322                         /* Remove from HW Security CAM */
 323                         memset(rtlpriv->sec.hwsec_cam_sta_addr[i], 0, ETH_ALEN);
 324                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 325                         pr_info("&&&&&&&&&del entry %d\n", i);
 326                 }
 327         }
 328         return;
 329 }
 330 EXPORT_SYMBOL(stg_rtl_cam_del_entry);