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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/export.h>
  33 #include "wifi.h"
  34 #include "cam.h"
  35
  36 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
  37 {
  38         struct rtl_priv *rtlpriv = rtl_priv(hw);
  39
  40         rtlpriv->sec.use_defaultkey = false;
  41         rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
  42         rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
  43         memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
  44         memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
  45         rtlpriv->sec.pairwise_key = NULL;
  46 }
  47
  48 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
  49                            u8 *mac_addr, u8 *key_cont_128, u16 us_config)
  50 {
  51         struct rtl_priv *rtlpriv = rtl_priv(hw);
  52
  53         u32 target_command;
  54         u32 target_content = 0;
  55         u8 entry_i;
  56
  57         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  58                  ("key_cont_128:\n %x:%x:%x:%x:%x:%x\n",
  59                   key_cont_128[0], key_cont_128[1],
  60                   key_cont_128[2], key_cont_128[3],
  61                   key_cont_128[4], key_cont_128[5]));
  62
  63         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
  64                 target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
  65                 target_command = target_command | BIT(31) | BIT(16);
  66
  67                 if (entry_i == 0) {
  68                         target_content = (u32) (*(mac_addr + 0)) << 16 |
  69                             (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
  70
  71                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  72                                         target_content);
  73                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  74                                         target_command);
  75
  76                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  77                                  ("WRITE %x: %x\n",
  78                                   rtlpriv->cfg->maps[WCAMI], target_content));
  79                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  80                                  ("The Key ID is %d\n", entry_no));
  81                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  82                                  ("WRITE %x: %x\n",
  83                                   rtlpriv->cfg->maps[RWCAM], target_command));
  84
  85                 } else if (entry_i == 1) {
  86
  87                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  88                             (u32) (*(mac_addr + 4)) << 16 |
  89                             (u32) (*(mac_addr + 3)) << 8 |
  90                             (u32) (*(mac_addr + 2));
  91
  92                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  93                                         target_content);
  94                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  95                                         target_command);
  96
  97                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  98                                  ("WRITE A4: %x\n", target_content));
  99                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 100                                  ("WRITE A0: %x\n", target_command));
 101
 102                 } else {
 103
 104                         target_content =
 105                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
 106                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
 107                             << 16 |
 108                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
 109                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
 110
 111                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 112                                         target_content);
 113                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 114                                         target_command);
 115                         udelay(100);
 116
 117                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 118                                  ("WRITE A4: %x\n", target_content));
 119                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 120                                  ("WRITE A0: %x\n", target_command));
 121                 }
 122         }
 123
 124         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 125                  ("after set key, usconfig:%x\n", us_config));
 126 }
 127
 128 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 129                          u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 130                          u32 ul_default_key, u8 *key_content)
 131 {
 132         u32 us_config;
 133         struct rtl_priv *rtlpriv = rtl_priv(hw);
 134
 135         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 136                  ("EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, "
 137                   "ulUseDK=%x MacAddr %pM\n",
 138                   ul_entry_idx, ul_key_id, ul_enc_alg,
 139                   ul_default_key, mac_addr));
 140
 141         if (ul_key_id == TOTAL_CAM_ENTRY) {
 142                 RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 143                          ("<=== ulKeyId exceed!\n"));
 144                 return 0;
 145         }
 146
 147         if (ul_default_key == 1) {
 148                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 149         } else {
 150                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 151         }
 152
 153         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 154                               (u8 *) key_content, us_config);
 155
 156         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, ("<===\n"));
 157
 158         return 1;
 159
 160 }
 161 EXPORT_SYMBOL(rtl_cam_add_one_entry);
 162
 163 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 164                              u8 *mac_addr, u32 ul_key_id)
 165 {
 166         u32 ul_command;
 167         struct rtl_priv *rtlpriv = rtl_priv(hw);
 168
 169         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, ("key_idx:%d\n", ul_key_id));
 170
 171         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 172         ul_command = ul_command | BIT(31) | BIT(16);
 173
 174         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 175         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 176
 177         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 178                  ("rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0));
 179         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 180                  ("rtl_cam_delete_one_entry(): WRITE A0: %x\n", ul_command));
 181
 182         return 0;
 183
 184 }
 185 EXPORT_SYMBOL(rtl_cam_delete_one_entry);
 186
 187 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 188 {
 189         u32 ul_command;
 190         struct rtl_priv *rtlpriv = rtl_priv(hw);
 191
 192         ul_command = BIT(31) | BIT(30);
 193         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 194 }
 195 EXPORT_SYMBOL(rtl_cam_reset_all_entry);
 196
 197 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 198 {
 199         struct rtl_priv *rtlpriv = rtl_priv(hw);
 200
 201         u32 ul_command;
 202         u32 ul_content;
 203         u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 204
 205         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 206         case WEP40_ENCRYPTION:
 207                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 208                 break;
 209         case WEP104_ENCRYPTION:
 210                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 211                 break;
 212         case TKIP_ENCRYPTION:
 213                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 214                 break;
 215         case AESCCMP_ENCRYPTION:
 216                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 217                 break;
 218         default:
 219                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 220         }
 221
 222         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 223
 224         ul_content |= BIT(15);
 225         ul_command = CAM_CONTENT_COUNT * uc_index;
 226         ul_command = ul_command | BIT(31) | BIT(16);
 227
 228         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 229         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 230
 231         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 232                  ("rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content));
 233         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 234                  ("rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command));
 235 }
 236 EXPORT_SYMBOL(rtl_cam_mark_invalid);
 237
 238 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 239 {
 240         struct rtl_priv *rtlpriv = rtl_priv(hw);
 241
 242         u32 ul_command;
 243         u32 ul_content;
 244         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 245         u8 entry_i;
 246
 247         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 248         case WEP40_ENCRYPTION:
 249                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 250                 break;
 251         case WEP104_ENCRYPTION:
 252                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 253                 break;
 254         case TKIP_ENCRYPTION:
 255                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 256                 break;
 257         case AESCCMP_ENCRYPTION:
 258                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 259                 break;
 260         default:
 261                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 262         }
 263
 264         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 265
 266                 if (entry_i == 0) {
 267                         ul_content =
 268                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 269                         ul_content |= BIT(15);
 270
 271                 } else {
 272                         ul_content = 0;
 273                 }
 274
 275                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 276                 ul_command = ul_command | BIT(31) | BIT(16);
 277
 278                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 279                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 280
 281                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 282                          ("rtl_cam_empty_entry(): WRITE A4: %x\n",
 283                           ul_content));
 284                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 285                          ("rtl_cam_empty_entry(): WRITE A0: %x\n",
 286                           ul_command));
 287         }
 288
 289 }
 290 EXPORT_SYMBOL(rtl_cam_empty_entry);
 291
 292 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 293 {
 294         struct rtl_priv *rtlpriv = rtl_priv(hw);
 295         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 296         u8 entry_idx = 0;
 297         u8 i, *addr;
 298
 299         if (NULL == sta_addr) {
 300                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 301                         ("sta_addr is NULL.\n"));
 302                 return TOTAL_CAM_ENTRY;
 303         }
 304         /* Does STA already exist? */
 305         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 306                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 307                 if (memcmp(addr, sta_addr, ETH_ALEN) == 0)
 308                         return i;
 309         }
 310         /* Get a free CAM entry. */
 311         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 312                 if ((bitmap & BIT(0)) == 0) {
 313                         RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 314                                 ("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 315                                  rtlpriv->sec.hwsec_cam_bitmap, entry_idx));
 316                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 317                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 318                                sta_addr, ETH_ALEN);
 319                         return entry_idx;
 320                 }
 321                 bitmap = bitmap >> 1;
 322         }
 323         return TOTAL_CAM_ENTRY;
 324 }
 325 EXPORT_SYMBOL(rtl_cam_get_free_entry);
 326
 327 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 328 {
 329         struct rtl_priv *rtlpriv = rtl_priv(hw);
 330         u32 bitmap;
 331         u8 i, *addr;
 332
 333         if (NULL == sta_addr) {
 334                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 335                         ("sta_addr is NULL.\n"));
 336         }
 337
 338         if ((sta_addr[0]|sta_addr[1]|sta_addr[2]|sta_addr[3]|\
 339                                 sta_addr[4]|sta_addr[5]) == 0) {
 340                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 341                         ("sta_addr is 00:00:00:00:00:00.\n"));
 342                 return;
 343         }
 344         /* Does STA already exist? */
 345         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 346                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 347                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 348                 if (((bitmap & BIT(0)) == BIT(0)) &&
 349                     (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
 350                         /* Remove from HW Security CAM */
 351                         memset(rtlpriv->sec.hwsec_cam_sta_addr[i], 0, ETH_ALEN);
 352                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 353                         pr_info("&&&&&&&&&del entry %d\n", i);
 354                 }
 355         }
 356         return;
 357 }
 358 EXPORT_SYMBOL(rtl_cam_del_entry);