drivers/staging/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 |
  61                                          (u32)us_config;
  62
  63                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  64                                         target_content);
  65                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  66                                         target_command);
  67
  68                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  69                                  "WRITE %x: %x\n",
  70                                  rtlpriv->cfg->maps[WCAMI], target_content);
  71                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  72                                  "The Key ID is %d\n", entry_no);
  73                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
  74                                  "WRITE %x: %x\n",
  75                                  rtlpriv->cfg->maps[RWCAM], target_command);
  76
  77                 } else if (entry_i == 1) {
  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                 } else {
  93                         target_content =
  94                             (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
  95                             24 | (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 2))
  96                             << 16 |
  97                             (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
  98                             | (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 0));
  99
 100                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 101                                         target_content);
 102                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 103                                         target_command);
 104
 105                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 106                                  "WRITE A4: %x\n", target_content);
 107                         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 108                                  "WRITE A0: %x\n", target_command);
 109                 }
 110         }
 111
 112         RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 113                  "after set key, usconfig:%x\n", us_config);
 114 }
 115
 116 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 117                          u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 118                          u32 ul_default_key, u8 *key_content)
 119 {
 120         u32 us_config;
 121         struct rtl_priv *rtlpriv = rtl_priv(hw);
 122
 123         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 124                  "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 125                  ul_entry_idx, ul_key_id, ul_enc_alg,
 126                  ul_default_key, mac_addr);
 127
 128         if (ul_key_id == TOTAL_CAM_ENTRY) {
 129                 RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 130                          "ulKeyId exceed!\n");
 131                 return 0;
 132         }
 133
 134         if (ul_default_key == 1)
 135                 us_config = CFG_VALID | ((u16)(ul_enc_alg) << 2);
 136         else
 137                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 138
 139         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 140                               (u8 *)key_content, us_config);
 141
 142         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");
 143
 144         return 1;
 145 }
 146
 147 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 148                              u8 *mac_addr, u32 ul_key_id)
 149 {
 150         u32 ul_command;
 151         struct rtl_priv *rtlpriv = rtl_priv(hw);
 152
 153         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
 154
 155         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 156         ul_command = ul_command | BIT(31) | BIT(16);
 157
 158         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 159         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 160
 161         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 162                  "%s(): WRITE A4: %x\n", __func__, 0);
 163         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 164                  "%s(): WRITE A0: %x\n", __func__, ul_command);
 165
 166         return 0;
 167 }
 168
 169 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 170 {
 171         u32 ul_command;
 172         struct rtl_priv *rtlpriv = rtl_priv(hw);
 173
 174         ul_command = BIT(31) | BIT(30);
 175         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 176 }
 177
 178 void 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(rtlpriv, COMP_SEC, DBG_DMESG,
 213                  "%s(): WRITE A4: %x\n", __func__, ul_content);
 214         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 215                  "%s(): WRITE A0: %x\n", __func__, ul_command);
 216 }
 217
 218 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 219 {
 220         struct rtl_priv *rtlpriv = rtl_priv(hw);
 221
 222         u32 ul_command;
 223         u32 ul_content;
 224         u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 225         u8 entry_i;
 226
 227         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 228         case WEP40_ENCRYPTION:
 229                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 230                 break;
 231         case WEP104_ENCRYPTION:
 232                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 233                 break;
 234         case TKIP_ENCRYPTION:
 235                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 236                 break;
 237         case AESCCMP_ENCRYPTION:
 238                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 239                 break;
 240         default:
 241                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 242         }
 243
 244         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 245                 if (entry_i == 0) {
 246                         ul_content =
 247                             (uc_index & 0x03) | ((u16)(ul_encalgo) << 2);
 248                         ul_content |= BIT(15);
 249                 } else {
 250                         ul_content = 0;
 251                 }
 252
 253                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 254                 ul_command = ul_command | BIT(31) | BIT(16);
 255
 256                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 257                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 258
 259                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 260                          "%s(): WRITE A4: %x\n", __func__, ul_content);
 261                 RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 262                          "%s(): WRITE A0: %x\n", __func__, ul_command);
 263         }
 264 }
 265
 266 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 267 {
 268         struct rtl_priv *rtlpriv = rtl_priv(hw);
 269         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 270         u8 entry_idx = 0;
 271         u8 i, *addr;
 272
 273         if (!sta_addr) {
 274                 pr_err("sta_addr is NULL.\n");
 275                 return TOTAL_CAM_ENTRY;
 276         }
 277         /* Does STA already exist? */
 278         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 279                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 280                 if (ether_addr_equal_unaligned(addr, sta_addr))
 281                         return i;
 282         }
 283         /* Get a free CAM entry. */
 284         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 285                 if ((bitmap & BIT(0)) == 0) {
 286                         pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 287                                rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
 288                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 289                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 290                                sta_addr, ETH_ALEN);
 291                         return entry_idx;
 292                 }
 293                 bitmap = bitmap >> 1;
 294         }
 295         return TOTAL_CAM_ENTRY;
 296 }
 297
 298 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 299 {
 300         struct rtl_priv *rtlpriv = rtl_priv(hw);
 301         u32 bitmap;
 302         u8 i, *addr;
 303
 304         if (!sta_addr) {
 305                 pr_err("sta_addr is NULL.\n");
 306                 return;
 307         }
 308
 309         if (is_zero_ether_addr(sta_addr)) {
 310                 pr_err("sta_addr is %pM\n", sta_addr);
 311                 return;
 312         }
 313         /* Does STA already exist? */
 314         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 315                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 316                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 317                 if (((bitmap & BIT(0)) == BIT(0)) &&
 318                     (ether_addr_equal_unaligned(addr, sta_addr))) {
 319                         /* Remove from HW Security CAM */
 320                         eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
 321                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 322                         RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 323                                  "&&&&&&&&&del entry %d\n", i);
 324                 }
 325         }
 326 }