drivers/net/wireless/realtek/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  * 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 #include <linux/export.h>
  28
  29 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
  30 {
  31         struct rtl_priv *rtlpriv = rtl_priv(hw);
  32
  33         rtlpriv->sec.use_defaultkey = false;
  34         rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
  35         rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
  36         memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
  37         memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
  38         rtlpriv->sec.pairwise_key = NULL;
  39 }
  40
  41 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
  42                            u8 *mac_addr, u8 *key_cont_128, u16 us_config)
  43 {
  44         struct rtl_priv *rtlpriv = rtl_priv(hw);
  45
  46         u32 target_command;
  47         u32 target_content = 0;
  48         int entry_i;
  49
  50         RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content :",
  51                       key_cont_128, 16);
  52
  53         /* 0-1 config + mac, 2-5 fill 128key,6-7 are reserved */
  54         for (entry_i = CAM_CONTENT_COUNT - 1; entry_i >= 0; entry_i--) {
  55                 target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
  56                 target_command = target_command | BIT(31) | BIT(16);
  57
  58                 if (entry_i == 0) {
  59                         target_content = (u32) (*(mac_addr + 0)) << 16 |
  60                             (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
  61
  62                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  63                                         target_content);
  64                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  65                                         target_command);
  66
  67                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  68                                  "WRITE %x: %x\n",
  69                                  rtlpriv->cfg->maps[WCAMI], target_content);
  70                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  71                                  "The Key ID is %d\n", entry_no);
  72                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  73                                  "WRITE %x: %x\n",
  74                                  rtlpriv->cfg->maps[RWCAM], target_command);
  75
  76                 } else if (entry_i == 1) {
  77
  78                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  79                             (u32) (*(mac_addr + 4)) << 16 |
  80                             (u32) (*(mac_addr + 3)) << 8 |
  81                             (u32) (*(mac_addr + 2));
  82
  83                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  84                                         target_content);
  85                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  86                                         target_command);
  87
  88                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  89                                  "WRITE A4: %x\n", target_content);
  90                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  91                                  "WRITE A0: %x\n", target_command);
  92
  93                 } else {
  94
  95                         target_content =
  96                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
  97                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
  98                             << 16 |
  99                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
 100                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
 101
 102                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 103                                         target_content);
 104                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 105                                         target_command);
 106
 107                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 108                                  "WRITE A4: %x\n", target_content);
 109                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 110                                  "WRITE A0: %x\n", target_command);
 111                 }
 112         }
 113
 114         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 115                  "after set key, usconfig:%x\n", us_config);
 116 }
 117
 118 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 119                          u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 120                          u32 ul_default_key, u8 *key_content)
 121 {
 122         u32 us_config;
 123         struct rtl_priv *rtlpriv = rtl_priv(hw);
 124
 125         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 126                  "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 127                  ul_entry_idx, ul_key_id, ul_enc_alg,
 128                  ul_default_key, mac_addr);
 129
 130         if (ul_key_id == TOTAL_CAM_ENTRY) {
 131                 RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 132                          "ulKeyId exceed!\n");
 133                 return 0;
 134         }
 135
 136         if (ul_default_key == 1)
 137                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 138         else
 139                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 140
 141         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 142                               (u8 *)key_content, us_config);
 143
 144         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");
 145
 146         return 1;
 147
 148 }
 149 EXPORT_SYMBOL(rtl_cam_add_one_entry);
 150
 151 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 152                              u8 *mac_addr, u32 ul_key_id)
 153 {
 154         u32 ul_command;
 155         struct rtl_priv *rtlpriv = rtl_priv(hw);
 156
 157         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
 158
 159         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 160         ul_command = ul_command | BIT(31) | BIT(16);
 161
 162         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 163         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 164
 165         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 166                  "rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0);
 167         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 168                  "rtl_cam_delete_one_entry(): WRITE A0: %x\n", ul_command);
 169
 170         return 0;
 171
 172 }
 173 EXPORT_SYMBOL(rtl_cam_delete_one_entry);
 174
 175 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 176 {
 177         u32 ul_command;
 178         struct rtl_priv *rtlpriv = rtl_priv(hw);
 179
 180         ul_command = BIT(31) | BIT(30);
 181         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 182 }
 183 EXPORT_SYMBOL(rtl_cam_reset_all_entry);
 184
 185 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 186 {
 187         struct rtl_priv *rtlpriv = rtl_priv(hw);
 188
 189         u32 ul_command;
 190         u32 ul_content;
 191         u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 192
 193         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 194         case WEP40_ENCRYPTION:
 195                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 196                 break;
 197         case WEP104_ENCRYPTION:
 198                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 199                 break;
 200         case TKIP_ENCRYPTION:
 201                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 202                 break;
 203         case AESCCMP_ENCRYPTION:
 204                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 205                 break;
 206         default:
 207                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 208         }
 209
 210         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 211
 212         ul_content |= BIT(15);
 213         ul_command = CAM_CONTENT_COUNT * uc_index;
 214         ul_command = ul_command | BIT(31) | BIT(16);
 215
 216         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 217         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 218
 219         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 220                  "rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content);
 221         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 222                  "rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command);
 223 }
 224 EXPORT_SYMBOL(rtl_cam_mark_invalid);
 225
 226 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 227 {
 228         struct rtl_priv *rtlpriv = rtl_priv(hw);
 229
 230         u32 ul_command;
 231         u32 ul_content;
 232         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 233         u8 entry_i;
 234
 235         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 236         case WEP40_ENCRYPTION:
 237                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 238                 break;
 239         case WEP104_ENCRYPTION:
 240                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 241                 break;
 242         case TKIP_ENCRYPTION:
 243                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 244                 break;
 245         case AESCCMP_ENCRYPTION:
 246                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 247                 break;
 248         default:
 249                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 250         }
 251
 252         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 253
 254                 if (entry_i == 0) {
 255                         ul_content =
 256                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 257                         ul_content |= BIT(15);
 258
 259                 } else {
 260                         ul_content = 0;
 261                 }
 262
 263                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 264                 ul_command = ul_command | BIT(31) | BIT(16);
 265
 266                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 267                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 268
 269                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 270                          "rtl_cam_empty_entry(): WRITE A4: %x\n",
 271                          ul_content);
 272                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 273                          "rtl_cam_empty_entry(): WRITE A0: %x\n",
 274                          ul_command);
 275         }
 276
 277 }
 278 EXPORT_SYMBOL(rtl_cam_empty_entry);
 279
 280 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 281 {
 282         struct rtl_priv *rtlpriv = rtl_priv(hw);
 283         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 284         u8 entry_idx = 0;
 285         u8 i, *addr;
 286
 287         if (NULL == sta_addr) {
 288                 pr_err("sta_addr is NULL.\n");
 289                 return TOTAL_CAM_ENTRY;
 290         }
 291         /* Does STA already exist? */
 292         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 293                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 294                 if (ether_addr_equal_unaligned(addr, sta_addr))
 295                         return i;
 296         }
 297         /* Get a free CAM entry. */
 298         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 299                 if ((bitmap & BIT(0)) == 0) {
 300                         pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 301                                rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
 302                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 303                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 304                                sta_addr, ETH_ALEN);
 305                         return entry_idx;
 306                 }
 307                 bitmap = bitmap >> 1;
 308         }
 309         return TOTAL_CAM_ENTRY;
 310 }
 311 EXPORT_SYMBOL(rtl_cam_get_free_entry);
 312
 313 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 314 {
 315         struct rtl_priv *rtlpriv = rtl_priv(hw);
 316         u32 bitmap;
 317         u8 i, *addr;
 318
 319         if (NULL == sta_addr) {
 320                 pr_err("sta_addr is NULL.\n");
 321                 return;
 322         }
 323
 324         if (is_zero_ether_addr(sta_addr)) {
 325                 pr_err("sta_addr is %pM\n", sta_addr);
 326                 return;
 327         }
 328         /* Does STA already exist? */
 329         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 330                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 331                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 332                 if (((bitmap & BIT(0)) == BIT(0)) &&
 333                     (ether_addr_equal_unaligned(addr, sta_addr))) {
 334                         /* Remove from HW Security CAM */
 335                         eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
 336                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 337                         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 338                                  "&&&&&&&&&del entry %d\n", i);
 339                 }
 340         }
 341         return;
 342 }
 343 EXPORT_SYMBOL(rtl_cam_del_entry);