drivers/net/wireless/rtlwifi/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  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * wlanfae <wlanfae@realtek.com>
  23  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  24  * Hsinchu 300, Taiwan.
  25  *
  26  * Larry Finger <Larry.Finger@lwfinger.net>
  27  *
  28  *****************************************************************************/
  29
  30 #include "wifi.h"
  31 #include "cam.h"
  32
  33 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
  34 {
  35         struct rtl_priv *rtlpriv = rtl_priv(hw);
  36
  37         rtlpriv->sec.use_defaultkey = false;
  38         rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
  39         rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
  40         memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
  41         memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
  42         rtlpriv->sec.pairwise_key = NULL;
  43 }
  44
  45 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
  46                            u8 *mac_addr, u8 *key_cont_128, u16 us_config)
  47 {
  48         struct rtl_priv *rtlpriv = rtl_priv(hw);
  49
  50         u32 target_command;
  51         u32 target_content = 0;
  52         u8 entry_i;
  53
  54         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  55                  ("key_cont_128:\n %x:%x:%x:%x:%x:%x\n",
  56                   key_cont_128[0], key_cont_128[1],
  57                   key_cont_128[2], key_cont_128[3],
  58                   key_cont_128[4], key_cont_128[5]));
  59
  60         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
  61                 target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
  62                 target_command = target_command | BIT(31) | BIT(16);
  63
  64                 if (entry_i == 0) {
  65                         target_content = (u32) (*(mac_addr + 0)) << 16 |
  66                             (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
  67
  68                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  69                                         target_content);
  70                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  71                                         target_command);
  72
  73                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  74                                  ("WRITE %x: %x\n",
  75                                   rtlpriv->cfg->maps[WCAMI], target_content));
  76                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  77                                  ("The Key ID is %d\n", entry_no));
  78                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  79                                  ("WRITE %x: %x\n",
  80                                   rtlpriv->cfg->maps[RWCAM], target_command));
  81
  82                 } else if (entry_i == 1) {
  83
  84                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  85                             (u32) (*(mac_addr + 4)) << 16 |
  86                             (u32) (*(mac_addr + 3)) << 8 |
  87                             (u32) (*(mac_addr + 2));
  88
  89                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  90                                         target_content);
  91                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  92                                         target_command);
  93
  94                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  95                                  ("WRITE A4: %x\n", target_content));
  96                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  97                                  ("WRITE A0: %x\n", target_command));
  98
  99                 } else {
 100
 101                         target_content =
 102                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
 103                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
 104                             << 16 |
 105                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
 106                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
 107
 108                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 109                                         target_content);
 110                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 111                                         target_command);
 112                         udelay(100);
 113
 114                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 115                                  ("WRITE A4: %x\n", target_content));
 116                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 117                                  ("WRITE A0: %x\n", target_command));
 118                 }
 119         }
 120
 121         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 122                  ("after set key, usconfig:%x\n", us_config));
 123 }
 124
 125 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 126                          u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 127                          u32 ul_default_key, u8 *key_content)
 128 {
 129         u32 us_config;
 130         struct rtl_priv *rtlpriv = rtl_priv(hw);
 131
 132         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 133                  ("EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, "
 134                   "ulUseDK=%x MacAddr" MAC_FMT "\n",
 135                   ul_entry_idx, ul_key_id, ul_enc_alg,
 136                   ul_default_key, MAC_ARG(mac_addr)));
 137
 138         if (ul_key_id == TOTAL_CAM_ENTRY) {
 139                 RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 140                          ("<=== ulKeyId exceed!\n"));
 141                 return 0;
 142         }
 143
 144         if (ul_default_key == 1) {
 145                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 146         } else {
 147                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 148         }
 149
 150         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 151                               (u8 *) key_content, us_config);
 152
 153         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, ("<===\n"));
 154
 155         return 1;
 156
 157 }
 158 EXPORT_SYMBOL(rtl_cam_add_one_entry);
 159
 160 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 161                              u8 *mac_addr, u32 ul_key_id)
 162 {
 163         u32 ul_command;
 164         struct rtl_priv *rtlpriv = rtl_priv(hw);
 165
 166         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, ("key_idx:%d\n", ul_key_id));
 167
 168         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 169         ul_command = ul_command | BIT(31) | BIT(16);
 170
 171         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 172         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 173
 174         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 175                  ("rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0));
 176         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 177                  ("rtl_cam_delete_one_entry(): WRITE A0: %x\n", ul_command));
 178
 179         return 0;
 180
 181 }
 182 EXPORT_SYMBOL(rtl_cam_delete_one_entry);
 183
 184 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 185 {
 186         u32 ul_command;
 187         struct rtl_priv *rtlpriv = rtl_priv(hw);
 188
 189         ul_command = BIT(31) | BIT(30);
 190         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 191 }
 192 EXPORT_SYMBOL(rtl_cam_reset_all_entry);
 193
 194 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 195 {
 196         struct rtl_priv *rtlpriv = rtl_priv(hw);
 197
 198         u32 ul_command;
 199         u32 ul_content;
 200         u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 201
 202         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 203         case WEP40_ENCRYPTION:
 204                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 205                 break;
 206         case WEP104_ENCRYPTION:
 207                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 208                 break;
 209         case TKIP_ENCRYPTION:
 210                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 211                 break;
 212         case AESCCMP_ENCRYPTION:
 213                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 214                 break;
 215         default:
 216                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 217         }
 218
 219         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 220
 221         ul_content |= BIT(15);
 222         ul_command = CAM_CONTENT_COUNT * uc_index;
 223         ul_command = ul_command | BIT(31) | BIT(16);
 224
 225         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 226         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 227
 228         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 229                  ("rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content));
 230         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 231                  ("rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command));
 232 }
 233 EXPORT_SYMBOL(rtl_cam_mark_invalid);
 234
 235 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 236 {
 237         struct rtl_priv *rtlpriv = rtl_priv(hw);
 238
 239         u32 ul_command;
 240         u32 ul_content;
 241         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 242         u8 entry_i;
 243
 244         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 245         case WEP40_ENCRYPTION:
 246                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 247                 break;
 248         case WEP104_ENCRYPTION:
 249                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 250                 break;
 251         case TKIP_ENCRYPTION:
 252                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 253                 break;
 254         case AESCCMP_ENCRYPTION:
 255                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 256                 break;
 257         default:
 258                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 259         }
 260
 261         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 262
 263                 if (entry_i == 0) {
 264                         ul_content =
 265                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 266                         ul_content |= BIT(15);
 267
 268                 } else {
 269                         ul_content = 0;
 270                 }
 271
 272                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 273                 ul_command = ul_command | BIT(31) | BIT(16);
 274
 275                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 276                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 277
 278                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 279                          ("rtl_cam_empty_entry(): WRITE A4: %x\n",
 280                           ul_content));
 281                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 282                          ("rtl_cam_empty_entry(): WRITE A0: %x\n",
 283                           ul_command));
 284         }
 285
 286 }
 287 EXPORT_SYMBOL(rtl_cam_empty_entry);
 288
 289 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 290 {
 291         struct rtl_priv *rtlpriv = rtl_priv(hw);
 292         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 293         u8 entry_idx = 0;
 294         u8 i, *addr;
 295
 296         if (NULL == sta_addr) {
 297                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 298                         ("sta_addr is NULL.\n"));
 299                 return TOTAL_CAM_ENTRY;
 300         }
 301         /* Does STA already exist? */
 302         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 303                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 304                 if (memcmp(addr, sta_addr, ETH_ALEN) == 0)
 305                         return i;
 306         }
 307         /* Get a free CAM entry. */
 308         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 309                 if ((bitmap & BIT(0)) == 0) {
 310                         RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 311                                 ("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 312                                  rtlpriv->sec.hwsec_cam_bitmap, entry_idx));
 313                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 314                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 315                                sta_addr, ETH_ALEN);
 316                         return entry_idx;
 317                 }
 318                 bitmap = bitmap >> 1;
 319         }
 320         return TOTAL_CAM_ENTRY;
 321 }
 322 EXPORT_SYMBOL(rtl_cam_get_free_entry);
 323
 324 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 325 {
 326         struct rtl_priv *rtlpriv = rtl_priv(hw);
 327         u32 bitmap;
 328         u8 i, *addr;
 329
 330         if (NULL == sta_addr) {
 331                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 332                         ("sta_addr is NULL.\n"));
 333         }
 334
 335         if ((sta_addr[0]|sta_addr[1]|sta_addr[2]|sta_addr[3]|\
 336                                 sta_addr[4]|sta_addr[5]) == 0) {
 337                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 338                         ("sta_addr is 00:00:00:00:00:00.\n"));
 339                 return;
 340         }
 341         /* Does STA already exist? */
 342         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 343                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 344                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 345                 if (((bitmap & BIT(0)) == BIT(0)) &&
 346                     (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
 347                         /* Remove from HW Security CAM */
 348                         memset(rtlpriv->sec.hwsec_cam_sta_addr[i], 0, ETH_ALEN);
 349                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 350                         printk(KERN_INFO "&&&&&&&&&del entry %d\n", i);
 351                 }
 352         }
 353         return;
 354 }
 355 EXPORT_SYMBOL(rtl_cam_del_entry);