drivers/net/wireless/realtek/rtlwifi/cam.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2009-2012  Realtek Corporation.*/
   3
   4 #include "wifi.h"
   5 #include "cam.h"
   6 #include <linux/export.h>
   7
   8 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
   9 {
  10         struct rtl_priv *rtlpriv = rtl_priv(hw);
  11
  12         rtlpriv->sec.use_defaultkey = false;
  13         rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
  14         rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
  15         memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
  16         memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
  17         rtlpriv->sec.pairwise_key = NULL;
  18 }
  19
  20 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
  21                                   const u8 *mac_addr, u8 *key_cont_128,
  22                                   u16 us_config)
  23 {
  24         struct rtl_priv *rtlpriv = rtl_priv(hw);
  25
  26         u32 target_command;
  27         u32 target_content = 0;
  28         int entry_i;
  29
  30         RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content :",
  31                       key_cont_128, 16);
  32
  33         /* 0-1 config + mac, 2-5 fill 128key,6-7 are reserved */
  34         for (entry_i = CAM_CONTENT_COUNT - 1; entry_i >= 0; entry_i--) {
  35                 target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
  36                 target_command = target_command | BIT(31) | BIT(16);
  37
  38                 if (entry_i == 0) {
  39                         target_content = (u32) (*(mac_addr + 0)) << 16 |
  40                             (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
  41
  42                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  43                                         target_content);
  44                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  45                                         target_command);
  46
  47                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  48                                 "WRITE %x: %x\n",
  49                                 rtlpriv->cfg->maps[WCAMI], target_content);
  50                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  51                                 "The Key ID is %d\n", entry_no);
  52                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  53                                 "WRITE %x: %x\n",
  54                                 rtlpriv->cfg->maps[RWCAM], target_command);
  55
  56                 } else if (entry_i == 1) {
  57
  58                         target_content = (u32) (*(mac_addr + 5)) << 24 |
  59                             (u32) (*(mac_addr + 4)) << 16 |
  60                             (u32) (*(mac_addr + 3)) << 8 |
  61                             (u32) (*(mac_addr + 2));
  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                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  69                                 "WRITE A4: %x\n", target_content);
  70                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  71                                 "WRITE A0: %x\n", target_command);
  72
  73                 } else {
  74
  75                         target_content =
  76                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
  77                             24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
  78                             << 16 |
  79                             (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
  80                             | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
  81
  82                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
  83                                         target_content);
  84                         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
  85                                         target_command);
  86
  87                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  88                                 "WRITE A4: %x\n", target_content);
  89                         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  90                                 "WRITE A0: %x\n", target_command);
  91                 }
  92         }
  93
  94         rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
  95                 "after set key, usconfig:%x\n", us_config);
  96 }
  97
  98 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, const u8 *mac_addr,
  99                          u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 100                          u32 ul_default_key, u8 *key_content)
 101 {
 102         u32 us_config;
 103         struct rtl_priv *rtlpriv = rtl_priv(hw);
 104
 105         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 106                 "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 107                 ul_entry_idx, ul_key_id, ul_enc_alg,
 108                 ul_default_key, mac_addr);
 109
 110         if (ul_key_id == TOTAL_CAM_ENTRY) {
 111                 rtl_dbg(rtlpriv, COMP_ERR, DBG_WARNING,
 112                         "ulKeyId exceed!\n");
 113                 return 0;
 114         }
 115
 116         if (ul_default_key == 1)
 117                 us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
 118         else
 119                 us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
 120
 121         rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 122                               (u8 *)key_content, us_config);
 123
 124         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");
 125
 126         return 1;
 127
 128 }
 129 EXPORT_SYMBOL(rtl_cam_add_one_entry);
 130
 131 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 132                              u8 *mac_addr, u32 ul_key_id)
 133 {
 134         u32 ul_command;
 135         struct rtl_priv *rtlpriv = rtl_priv(hw);
 136
 137         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
 138
 139         ul_command = ul_key_id * CAM_CONTENT_COUNT;
 140         ul_command = ul_command | BIT(31) | BIT(16);
 141
 142         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 143         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 144
 145         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 146                 "%s: WRITE A4: %x\n", __func__, 0);
 147         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 148                 "%s: WRITE A0: %x\n", __func__, ul_command);
 149
 150         return 0;
 151
 152 }
 153 EXPORT_SYMBOL(rtl_cam_delete_one_entry);
 154
 155 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 156 {
 157         u32 ul_command;
 158         struct rtl_priv *rtlpriv = rtl_priv(hw);
 159
 160         ul_command = BIT(31) | BIT(30);
 161         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 162 }
 163 EXPORT_SYMBOL(rtl_cam_reset_all_entry);
 164
 165 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 166 {
 167         struct rtl_priv *rtlpriv = rtl_priv(hw);
 168
 169         u32 ul_command;
 170         u32 ul_content;
 171         u32 ul_enc_algo;
 172
 173         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 174         case WEP40_ENCRYPTION:
 175                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 176                 break;
 177         case WEP104_ENCRYPTION:
 178                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 179                 break;
 180         case TKIP_ENCRYPTION:
 181                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 182                 break;
 183         case AESCCMP_ENCRYPTION:
 184                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 185                 break;
 186         default:
 187                 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 188         }
 189
 190         ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
 191
 192         ul_content |= BIT(15);
 193         ul_command = CAM_CONTENT_COUNT * uc_index;
 194         ul_command = ul_command | BIT(31) | BIT(16);
 195
 196         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 197         rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 198
 199         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 200                 "%s: WRITE A4: %x\n", __func__, ul_content);
 201         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 202                 "%s: WRITE A0: %x\n", __func__, ul_command);
 203 }
 204 EXPORT_SYMBOL(rtl_cam_mark_invalid);
 205
 206 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 207 {
 208         struct rtl_priv *rtlpriv = rtl_priv(hw);
 209
 210         u32 ul_command;
 211         u32 ul_content;
 212         u32 ul_encalgo;
 213         u8 entry_i;
 214
 215         switch (rtlpriv->sec.pairwise_enc_algorithm) {
 216         case WEP40_ENCRYPTION:
 217                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 218                 break;
 219         case WEP104_ENCRYPTION:
 220                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 221                 break;
 222         case TKIP_ENCRYPTION:
 223                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 224                 break;
 225         case AESCCMP_ENCRYPTION:
 226                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 227                 break;
 228         default:
 229                 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 230         }
 231
 232         for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 233
 234                 if (entry_i == 0) {
 235                         ul_content =
 236                             (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
 237                         ul_content |= BIT(15);
 238
 239                 } else {
 240                         ul_content = 0;
 241                 }
 242
 243                 ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 244                 ul_command = ul_command | BIT(31) | BIT(16);
 245
 246                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 247                 rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 248
 249                 rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 250                         "%s: WRITE A4: %x\n", __func__, ul_content);
 251                 rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 252                         "%s: WRITE A0: %x\n", __func__, ul_command);
 253         }
 254
 255 }
 256 EXPORT_SYMBOL(rtl_cam_empty_entry);
 257
 258 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 259 {
 260         struct rtl_priv *rtlpriv = rtl_priv(hw);
 261         u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 262         u8 entry_idx = 0;
 263         u8 i, *addr;
 264
 265         if (NULL == sta_addr) {
 266                 pr_err("sta_addr is NULL.\n");
 267                 return TOTAL_CAM_ENTRY;
 268         }
 269         /* Does STA already exist? */
 270         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 271                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 272                 if (ether_addr_equal_unaligned(addr, sta_addr))
 273                         return i;
 274         }
 275         /* Get a free CAM entry. */
 276         for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 277                 if ((bitmap & BIT(0)) == 0) {
 278                         pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 279                                rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
 280                         rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 281                         memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 282                                sta_addr, ETH_ALEN);
 283                         return entry_idx;
 284                 }
 285                 bitmap = bitmap >> 1;
 286         }
 287         return TOTAL_CAM_ENTRY;
 288 }
 289 EXPORT_SYMBOL(rtl_cam_get_free_entry);
 290
 291 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 292 {
 293         struct rtl_priv *rtlpriv = rtl_priv(hw);
 294         u32 bitmap;
 295         u8 i, *addr;
 296
 297         if (NULL == sta_addr) {
 298                 pr_err("sta_addr is NULL.\n");
 299                 return;
 300         }
 301
 302         if (is_zero_ether_addr(sta_addr)) {
 303                 pr_err("sta_addr is %pM\n", sta_addr);
 304                 return;
 305         }
 306         /* Does STA already exist? */
 307         for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 308                 addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 309                 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 310                 if (((bitmap & BIT(0)) == BIT(0)) &&
 311                     (ether_addr_equal_unaligned(addr, sta_addr))) {
 312                         /* Remove from HW Security CAM */
 313                         eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
 314                         rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 315                         rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 316                                 "&&&&&&&&&del entry %d\n", i);
 317                 }
 318         }
 319         return;
 320 }
 321 EXPORT_SYMBOL(rtl_cam_del_entry);