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,
  66                                  ("WRITE %x: %x\n",
  67                                   rtlpriv->cfg->maps[WCAMI], target_content));
  68                         RT_TRACE(COMP_SEC, DBG_LOUD,
  69                                  ("The Key ID is %d\n", entry_no));
  70                         RT_TRACE(COMP_SEC, DBG_LOUD,
  71                                  ("WRITE %x: %x\n",
  72                                   rtlpriv->cfg->maps[RWCAM], target_command));
  73                 } else if (entry_i == 1) {
  74                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  75                             (u32) (*(mac_addr + 4)) << 16 |
  76                             (u32) (*(mac_addr + 3)) << 8 |
  77                             (u32) (*(mac_addr + 2));
  78
  79                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  80                                         target_content);
  81                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  82                                         target_command);
  83
  84                         RT_TRACE(COMP_SEC, DBG_LOUD,
  85                                  ("WRITE A4: %x\n", target_content));
  86                         RT_TRACE(COMP_SEC, DBG_LOUD,
  87                                  ("WRITE A0: %x\n", target_command));
  88                 } else {
  89                         target_content =
  90                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
  91                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
  92                             << 16 |
  93                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
  94                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
  95
  96                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  97                                         target_content);
  98                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  99                                         target_command);
 100                         udelay(100);
 101
 102                         RT_TRACE(COMP_SEC, DBG_LOUD,
 103                                  ("WRITE A4: %x\n", target_content));
 104                         RT_TRACE(COMP_SEC, DBG_LOUD,
 105                                  ("WRITE A0: %x\n", target_command));
 106                 }
 107         }
 108
 109         RT_TRACE(COMP_SEC, DBG_LOUD,
 110                  ("after set key, usconfig:%x\n", us_config));
 111 }
 112
 113 u8 stg_rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 114                              u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 115                              u32 ul_default_key, u8 *key_content)
 116 {
 117         u32 us_config;
 118         struct rtl_priv *rtlpriv = rtl_priv(hw);
 119
 120         RT_TRACE(COMP_SEC, DBG_DMESG,
 121                  ("EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 122                   ul_entry_idx, ul_key_id, ul_enc_alg,
 123                   ul_default_key, mac_addr));
 124
 125         if (ul_key_id == TOTAL_CAM_ENTRY) {
 126                 RT_TRACE(COMP_ERR, DBG_WARNING,
 127                          ("ulKeyId exceed!\n"));
 128                 return 0;
 129         }
 130
 131         if (ul_default_key == 1)
 132                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 133         else
 134                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 135
 136         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 137                               (u8 *)key_content, us_config);
 138
 139         RT_TRACE(COMP_SEC, DBG_DMESG, ("end\n"));
 140
 141         return 1;
 142 }
 143 EXPORT_SYMBOL(stg_rtl_cam_add_one_entry);
 144
 145 int stg_rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 146                                  u8 *mac_addr, u32 ul_key_id)
 147 {
 148         u32 ul_command;
 149         struct rtl_priv *rtlpriv = rtl_priv(hw);
 150
 151         RT_TRACE(COMP_SEC, DBG_DMESG, ("key_idx:%d\n", ul_key_id));
 152
 153         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 154         ul_command = ul_command | BIT(31) | BIT(16);
 155
 156         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 157         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 158
 159         RT_TRACE(COMP_SEC, DBG_DMESG,
 160                  ("stg_rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0));
 161         RT_TRACE(COMP_SEC, DBG_DMESG,
 162                  ("stg_rtl_cam_delete_one_entry(): WRITE A0: %x\n",
 163                   ul_command));
 164         return 0;
 165 }
 166 EXPORT_SYMBOL(stg_rtl_cam_delete_one_entry);
 167
 168 void stg_rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 169 {
 170         u32 ul_command;
 171         struct rtl_priv *rtlpriv = rtl_priv(hw);
 172
 173         ul_command = BIT(31) | BIT(30);
 174         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 175 }
 176 EXPORT_SYMBOL(stg_rtl_cam_reset_all_entry);
 177
 178 void stg_rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 179 {
 180         struct rtl_priv *rtlpriv = rtl_priv(hw);
 181
 182         u32 ul_command;
 183         u32 ul_content;
 184         u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 185
 186         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 187         case WEP40_ENCRYPTION:
 188                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 189                 break;
 190         case WEP104_ENCRYPTION:
 191                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 192                 break;
 193         case TKIP_ENCRYPTION:
 194                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 195                 break;
 196         case AESCCMP_ENCRYPTION:
 197                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 198                 break;
 199         default:
 200                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 201         }
 202
 203         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 204
 205         ul_content |= BIT(15);
 206         ul_command = CAM_CONTENT_COUNT * uc_index;
 207         ul_command = ul_command | BIT(31) | BIT(16);
 208
 209         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 210         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 211
 212         RT_TRACE(COMP_SEC, DBG_DMESG,
 213                  ("stg_rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content));
 214         RT_TRACE(COMP_SEC, DBG_DMESG,
 215                  ("stg_rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command));
 216 }
 217 EXPORT_SYMBOL(stg_rtl_cam_mark_invalid);
 218
 219 void stg_rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 220 {
 221         struct rtl_priv *rtlpriv = rtl_priv(hw);
 222
 223         u32 ul_command;
 224         u32 ul_content;
 225         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 226         u8 entry_i;
 227
 228         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 229         case WEP40_ENCRYPTION:
 230                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 231                 break;
 232         case WEP104_ENCRYPTION:
 233                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 234                 break;
 235         case TKIP_ENCRYPTION:
 236                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 237                 break;
 238         case AESCCMP_ENCRYPTION:
 239                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 240                 break;
 241         default:
 242                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 243         }
 244
 245         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 246                 if (entry_i == 0) {
 247                         ul_content =
 248                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 249                         ul_content |= BIT(15);
 250
 251                 } else {
 252                         ul_content = 0;
 253                 }
 254
 255                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 256                 ul_command = ul_command | BIT(31) | BIT(16);
 257
 258                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 259                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 260
 261                 RT_TRACE(COMP_SEC, DBG_LOUD,
 262                          ("stg_rtl_cam_empty_entry(): WRITE A4: %x\n",
 263                           ul_content));
 264                 RT_TRACE(COMP_SEC, DBG_LOUD,
 265                          ("stg_rtl_cam_empty_entry(): WRITE A0: %x\n",
 266                           ul_command));
 267         }
 268 }
 269 EXPORT_SYMBOL(stg_rtl_cam_empty_entry);
 270
 271 u8 stg_rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 272 {
 273         struct rtl_priv *rtlpriv = rtl_priv(hw);
 274         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 275         u8 entry_idx = 0;
 276         u8 i, *addr;
 277
 278         if (!sta_addr) {
 279                 RT_TRACE(COMP_SEC, DBG_EMERG,
 280                          ("sta_addr is NULL\n"));
 281                 return TOTAL_CAM_ENTRY;
 282         }
 283         /* Does STA already exist? */
 284         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 285                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 286                 if (memcmp(addr, sta_addr, ETH_ALEN) == 0)
 287                         return i;
 288         }
 289         /* Get a free CAM entry. */
 290         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 291                 if ((bitmap & BIT(0)) == 0) {
 292                         RT_TRACE(COMP_SEC, DBG_EMERG,
 293                                  ("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 294                                           rtlpriv->sec.hwsec_cam_bitmap, entry_idx));
 295                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 296                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 297                                sta_addr, ETH_ALEN);
 298                         return entry_idx;
 299                 }
 300                 bitmap = bitmap >> 1;
 301         }
 302         return TOTAL_CAM_ENTRY;
 303 }
 304 EXPORT_SYMBOL(stg_rtl_cam_get_free_entry);
 305
 306 void stg_rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 307 {
 308         struct rtl_priv *rtlpriv = rtl_priv(hw);
 309         u32 bitmap;
 310         u8 i, *addr;
 311
 312         if (NULL == sta_addr) {
 313                 RT_TRACE(COMP_SEC, DBG_EMERG,
 314                          ("sta_addr is NULL.\n"));
 315                 return;
 316         }
 317
 318         if (is_zero_ether_addr(sta_addr)) {
 319                 RT_TRACE(COMP_SEC, DBG_EMERG,
 320                          ("sta_addr is 00:00:00:00:00:00.\n"));
 321                 return;
 322         }
 323         /* Does STA already exist? */
 324         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 325                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 326                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 327                 if (((bitmap & BIT(0)) == BIT(0)) &&
 328                     (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
 329                         /* Remove from HW Security CAM */
 330                         memset(rtlpriv->sec.hwsec_cam_sta_addr[i], 0, ETH_ALEN);
 331                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 332                         pr_info("&&&&&&&&&del entry %d\n", i);
 333                 }
 334         }
 335         return;
 336 }
 337 EXPORT_SYMBOL(stg_rtl_cam_del_entry);