drivers/net/wireless/rtlwifi/cam.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2012  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 <linux/export.h>
  31 #include "wifi.h"
  32 #include "cam.h"
  33
  34 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
  35 {
  36         struct rtl_priv *rtlpriv = rtl_priv(hw);
  37
  38         rtlpriv->sec.use_defaultkey = false;
  39         rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
  40         rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
  41         memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
  42         memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
  43         rtlpriv->sec.pairwise_key = NULL;
  44 }
  45
  46 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
  47                            u8 *mac_addr, u8 *key_cont_128, u16 us_config)
  48 {
  49         struct rtl_priv *rtlpriv = rtl_priv(hw);
  50
  51         u32 target_command;
  52         u32 target_content = 0;
  53         u8 entry_i;
  54
  55         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "key_cont_128: %6phC\n",
  56                  key_cont_128);
  57
  58         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
  59                 target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
  60                 target_command = target_command | BIT(31) | BIT(16);
  61
  62                 if (entry_i == 0) {
  63                         target_content = (u32) (*(mac_addr + 0)) << 16 |
  64                             (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
  65
  66                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  67                                         target_content);
  68                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  69                                         target_command);
  70
  71                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE %x: %x\n",
  72                                  rtlpriv->cfg->maps[WCAMI], target_content);
  73                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  74                                  "The Key ID is %d\n", entry_no);
  75                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE %x: %x\n",
  76                                  rtlpriv->cfg->maps[RWCAM], target_command);
  77
  78                 } else if (entry_i == 1) {
  79
  80                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  81                             (u32) (*(mac_addr + 4)) << 16 |
  82                             (u32) (*(mac_addr + 3)) << 8 |
  83                             (u32) (*(mac_addr + 2));
  84
  85                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  86                                         target_content);
  87                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  88                                         target_command);
  89
  90                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A4: %x\n",
  91                                  target_content);
  92                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A0: %x\n",
  93                                  target_command);
  94
  95                 } else {
  96
  97                         target_content =
  98                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
  99                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
 100                             << 16 |
 101                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
 102                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
 103
 104                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 105                                         target_content);
 106                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 107                                         target_command);
 108                         udelay(100);
 109
 110                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A4: %x\n",
 111                                  target_content);
 112                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A0: %x\n",
 113                                  target_command);
 114                 }
 115         }
 116
 117         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "after set key, usconfig:%x\n",
 118                  us_config);
 119 }
 120
 121 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 122                          u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 123                          u32 ul_default_key, u8 *key_content)
 124 {
 125         u32 us_config;
 126         struct rtl_priv *rtlpriv = rtl_priv(hw);
 127
 128         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 129                  "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 130                  ul_entry_idx, ul_key_id, ul_enc_alg,
 131                  ul_default_key, mac_addr);
 132
 133         if (ul_key_id == TOTAL_CAM_ENTRY) {
 134                 RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 135                          "<=== ulKeyId exceed!\n");
 136                 return 0;
 137         }
 138
 139         if (ul_default_key == 1) {
 140                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 141         } else {
 142                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 143         }
 144
 145         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 146                               key_content, us_config);
 147
 148         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "<===\n");
 149
 150         return 1;
 151
 152 }
 153 EXPORT_SYMBOL(rtl_cam_add_one_entry);
 154
 155 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 156                              u8 *mac_addr, u32 ul_key_id)
 157 {
 158         u32 ul_command;
 159         struct rtl_priv *rtlpriv = rtl_priv(hw);
 160
 161         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
 162
 163         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 164         ul_command = ul_command | BIT(31) | BIT(16);
 165
 166         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 167         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 168
 169         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 170                  "rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0);
 171         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 172                  "rtl_cam_delete_one_entry(): WRITE A0: %x\n", ul_command);
 173
 174         return 0;
 175
 176 }
 177 EXPORT_SYMBOL(rtl_cam_delete_one_entry);
 178
 179 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 180 {
 181         u32 ul_command;
 182         struct rtl_priv *rtlpriv = rtl_priv(hw);
 183
 184         ul_command = BIT(31) | BIT(30);
 185         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 186 }
 187 EXPORT_SYMBOL(rtl_cam_reset_all_entry);
 188
 189 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 190 {
 191         struct rtl_priv *rtlpriv = rtl_priv(hw);
 192
 193         u32 ul_command;
 194         u32 ul_content;
 195         u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 196
 197         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 198         case WEP40_ENCRYPTION:
 199                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 200                 break;
 201         case WEP104_ENCRYPTION:
 202                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 203                 break;
 204         case TKIP_ENCRYPTION:
 205                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 206                 break;
 207         case AESCCMP_ENCRYPTION:
 208                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 209                 break;
 210         default:
 211                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 212         }
 213
 214         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 215
 216         ul_content |= BIT(15);
 217         ul_command = CAM_CONTENT_COUNT * uc_index;
 218         ul_command = ul_command | BIT(31) | BIT(16);
 219
 220         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 221         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 222
 223         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 224                  "rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content);
 225         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 226                  "rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command);
 227 }
 228 EXPORT_SYMBOL(rtl_cam_mark_invalid);
 229
 230 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 231 {
 232         struct rtl_priv *rtlpriv = rtl_priv(hw);
 233
 234         u32 ul_command;
 235         u32 ul_content;
 236         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 237         u8 entry_i;
 238
 239         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 240         case WEP40_ENCRYPTION:
 241                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 242                 break;
 243         case WEP104_ENCRYPTION:
 244                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 245                 break;
 246         case TKIP_ENCRYPTION:
 247                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 248                 break;
 249         case AESCCMP_ENCRYPTION:
 250                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 251                 break;
 252         default:
 253                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 254         }
 255
 256         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 257
 258                 if (entry_i == 0) {
 259                         ul_content =
 260                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 261                         ul_content |= BIT(15);
 262
 263                 } else {
 264                         ul_content = 0;
 265                 }
 266
 267                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 268                 ul_command = ul_command | BIT(31) | BIT(16);
 269
 270                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 271                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 272
 273                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 274                          "rtl_cam_empty_entry(): WRITE A4: %x\n",
 275                          ul_content);
 276                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 277                          "rtl_cam_empty_entry(): WRITE A0: %x\n",
 278                          ul_command);
 279         }
 280
 281 }
 282 EXPORT_SYMBOL(rtl_cam_empty_entry);
 283
 284 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 285 {
 286         struct rtl_priv *rtlpriv = rtl_priv(hw);
 287         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 288         u8 entry_idx = 0;
 289         u8 i, *addr;
 290
 291         if (NULL == sta_addr) {
 292                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG, "sta_addr is NULL\n");
 293                 return TOTAL_CAM_ENTRY;
 294         }
 295         /* Does STA already exist? */
 296         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 297                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 298                 if (memcmp(addr, sta_addr, ETH_ALEN) == 0)
 299                         return i;
 300         }
 301         /* Get a free CAM entry. */
 302         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 303                 if ((bitmap & BIT(0)) == 0) {
 304                         RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 305                                  "-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 306                                  rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
 307                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 308                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 309                                sta_addr, ETH_ALEN);
 310                         return entry_idx;
 311                 }
 312                 bitmap = bitmap >> 1;
 313         }
 314         return TOTAL_CAM_ENTRY;
 315 }
 316 EXPORT_SYMBOL(rtl_cam_get_free_entry);
 317
 318 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 319 {
 320         struct rtl_priv *rtlpriv = rtl_priv(hw);
 321         u32 bitmap;
 322         u8 i, *addr;
 323
 324         if (NULL == sta_addr) {
 325                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG, "sta_addr is NULL\n");
 326         }
 327
 328         if (is_zero_ether_addr(sta_addr)) {
 329                 RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
 330                          "sta_addr is %pM\n", sta_addr);
 331                 return;
 332         }
 333         /* Does STA already exist? */
 334         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 335                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 336                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 337                 if (((bitmap & BIT(0)) == BIT(0)) &&
 338                     (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
 339                         /* Remove from HW Security CAM */
 340                         eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
 341                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 342                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 343                                  "del CAM entry %d\n", i);
 344                 }
 345         }
 346         return;
 347 }
 348 EXPORT_SYMBOL(rtl_cam_del_entry);