drivers/staging/rtl8188eu/core/rtw_ieee80211.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2007 - 2011 Realtek Corporation. All rights reserved.
   5  *
   6  ******************************************************************************/
   7 #define _IEEE80211_C
   8
   9 #include <linux/ieee80211.h>
  10
  11 #include <drv_types.h>
  12 #include <osdep_intf.h>
  13 #include <ieee80211.h>
  14 #include <wifi.h>
  15 #include <osdep_service.h>
  16 #include <wlan_bssdef.h>
  17
  18 u8 RTW_WPA_OUI_TYPE[] = { 0x00, 0x50, 0xf2, 1 };
  19 u8 WPA_AUTH_KEY_MGMT_NONE[] = { 0x00, 0x50, 0xf2, 0 };
  20 u8 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X[] = { 0x00, 0x50, 0xf2, 1 };
  21 u8 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X[] = { 0x00, 0x50, 0xf2, 2 };
  22 u8 WPA_CIPHER_SUITE_NONE[] = { 0x00, 0x50, 0xf2, 0 };
  23 u8 WPA_CIPHER_SUITE_WEP40[] = { 0x00, 0x50, 0xf2, 1 };
  24 u8 WPA_CIPHER_SUITE_TKIP[] = { 0x00, 0x50, 0xf2, 2 };
  25 u8 WPA_CIPHER_SUITE_WRAP[] = { 0x00, 0x50, 0xf2, 3 };
  26 u8 WPA_CIPHER_SUITE_CCMP[] = { 0x00, 0x50, 0xf2, 4 };
  27 u8 WPA_CIPHER_SUITE_WEP104[] = { 0x00, 0x50, 0xf2, 5 };
  28
  29 u16 RSN_VERSION_BSD = 1;
  30 u8 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X[] = { 0x00, 0x0f, 0xac, 1 };
  31 u8 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X[] = { 0x00, 0x0f, 0xac, 2 };
  32 u8 RSN_CIPHER_SUITE_NONE[] = { 0x00, 0x0f, 0xac, 0 };
  33 u8 RSN_CIPHER_SUITE_WEP40[] = { 0x00, 0x0f, 0xac, 1 };
  34 u8 RSN_CIPHER_SUITE_TKIP[] = { 0x00, 0x0f, 0xac, 2 };
  35 u8 RSN_CIPHER_SUITE_WRAP[] = { 0x00, 0x0f, 0xac, 3 };
  36 u8 RSN_CIPHER_SUITE_CCMP[] = { 0x00, 0x0f, 0xac, 4 };
  37 u8 RSN_CIPHER_SUITE_WEP104[] = { 0x00, 0x0f, 0xac, 5 };
  38 /*  */
  39 /*  for adhoc-master to generate ie and provide supported-rate to fw */
  40 /*  */
  41
  42 static u8 WIFI_CCKRATES[] = {
  43         IEEE80211_CCK_RATE_1MB | IEEE80211_BASIC_RATE_MASK,
  44         IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK,
  45         IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK,
  46         IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK
  47 };
  48
  49 static u8 WIFI_OFDMRATES[] = {
  50          IEEE80211_OFDM_RATE_6MB,
  51          IEEE80211_OFDM_RATE_9MB,
  52          IEEE80211_OFDM_RATE_12MB,
  53          IEEE80211_OFDM_RATE_18MB,
  54          IEEE80211_OFDM_RATE_24MB,
  55          IEEE80211_OFDM_RATE_36MB,
  56          IEEE80211_OFDM_RATE_48MB,
  57          IEEE80211_OFDM_RATE_54MB
  58 };
  59
  60 int rtw_get_bit_value_from_ieee_value(u8 val)
  61 {
  62         unsigned char dot11_rate_table[] = {
  63                 2, 4, 11, 22, 12, 18, 24, 36, 48,
  64                 72, 96, 108, 0}; /*  last element must be zero!! */
  65         int i = 0;
  66
  67         while (dot11_rate_table[i] != 0) {
  68                 if (dot11_rate_table[i] == val)
  69                         return BIT(i);
  70                 i++;
  71         }
  72         return 0;
  73 }
  74
  75 bool rtw_is_cckrates_included(u8 *rate)
  76 {
  77         while (*rate) {
  78                 u8 r = *rate & 0x7f;
  79
  80                 if (r == 2 || r == 4 || r == 11 || r == 22)
  81                         return true;
  82                 rate++;
  83         }
  84
  85         return false;
  86 }
  87
  88 bool rtw_is_cckratesonly_included(u8 *rate)
  89 {
  90         while (*rate) {
  91                 u8 r = *rate & 0x7f;
  92
  93                 if (r != 2 && r != 4 && r != 11 && r != 22)
  94                         return false;
  95                 rate++;
  96         }
  97
  98         return true;
  99 }
 100
 101 int rtw_check_network_type(unsigned char *rate, int ratelen, int channel)
 102 {
 103         if (channel > 14) {
 104                 if (rtw_is_cckrates_included(rate))
 105                         return WIRELESS_INVALID;
 106                 else
 107                         return WIRELESS_11A;
 108         } else {  /*  could be pure B, pure G, or B/G */
 109                 if (rtw_is_cckratesonly_included(rate))
 110                         return WIRELESS_11B;
 111                 else if (rtw_is_cckrates_included(rate))
 112                         return  WIRELESS_11BG;
 113                 else
 114                         return WIRELESS_11G;
 115         }
 116 }
 117
 118 u8 *rtw_set_fixed_ie(void *pbuf, unsigned int len, void *source,
 119                      unsigned int *frlen)
 120 {
 121         memcpy(pbuf, source, len);
 122         *frlen = *frlen + len;
 123         return ((u8 *)pbuf) + len;
 124 }
 125
 126 /*  rtw_set_ie will update frame length */
 127 u8 *rtw_set_ie
 128 (
 129         u8 *pbuf,
 130         int index,
 131         uint len,
 132         u8 *source,
 133         uint *frlen /* frame length */
 134 )
 135 {
 136         *pbuf = (u8)index;
 137
 138         *(pbuf + 1) = (u8)len;
 139
 140         if (len > 0)
 141                 memcpy((void *)(pbuf + 2), (void *)source, len);
 142
 143         *frlen = *frlen + (len + 2);
 144
 145         return pbuf + len + 2;
 146 }
 147
 148 /*----------------------------------------------------------------------------
 149 index: the information element id index, limit is the limit for search
 150 -----------------------------------------------------------------------------*/
 151 u8 *rtw_get_ie(u8 *pbuf, int index, uint *len, int limit)
 152 {
 153         int tmp, i;
 154         u8 *p;
 155
 156         if (limit < 1)
 157                 return NULL;
 158
 159         p = pbuf;
 160         i = 0;
 161         *len = 0;
 162         while (1) {
 163                 if (*p == index) {
 164                         *len = *(p + 1);
 165                         return p;
 166                 } else {
 167                         tmp = *(p + 1);
 168                         p += (tmp + 2);
 169                         i += (tmp + 2);
 170                 }
 171                 if (i >= limit)
 172                         break;
 173         }
 174         return NULL;
 175 }
 176
 177 void rtw_set_supported_rate(u8 *SupportedRates, uint mode)
 178 {
 179         memset(SupportedRates, 0, NDIS_802_11_LENGTH_RATES_EX);
 180
 181         switch (mode) {
 182         case WIRELESS_11B:
 183                 memcpy(SupportedRates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
 184                 break;
 185         case WIRELESS_11G:
 186         case WIRELESS_11A:
 187         case WIRELESS_11_5N:
 188         case WIRELESS_11A_5N:/* Todo: no basic rate for ofdm ? */
 189                 memcpy(SupportedRates, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
 190                 break;
 191         case WIRELESS_11BG:
 192         case WIRELESS_11G_24N:
 193         case WIRELESS_11_24N:
 194         case WIRELESS_11BG_24N:
 195                 memcpy(SupportedRates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
 196                 memcpy(SupportedRates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
 197                 break;
 198         }
 199 }
 200
 201 uint rtw_get_rateset_len(u8 *rateset)
 202 {
 203         uint i;
 204
 205         for (i = 0; i < 13; i++)
 206                 if (rateset[i] == 0)
 207                         break;
 208         return i;
 209 }
 210
 211 int rtw_generate_ie(struct registry_priv *pregistrypriv)
 212 {
 213         u8 wireless_mode;
 214         int rateLen;
 215         uint sz = 0;
 216         struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
 217         u8 *ie = pdev_network->ies;
 218
 219         /* timestamp will be inserted by hardware */
 220         sz += 8;
 221         ie += sz;
 222
 223         /* beacon interval : 2bytes */
 224         *(__le16 *)ie = cpu_to_le16((u16)pdev_network->Configuration.BeaconPeriod);/* BCN_INTERVAL; */
 225         sz += 2;
 226         ie += 2;
 227
 228         /* capability info */
 229         *(u16 *)ie = 0;
 230
 231         *(__le16 *)ie |= cpu_to_le16(cap_IBSS);
 232
 233         if (pregistrypriv->preamble == PREAMBLE_SHORT)
 234                 *(__le16 *)ie |= cpu_to_le16(cap_ShortPremble);
 235
 236         if (pdev_network->Privacy)
 237                 *(__le16 *)ie |= cpu_to_le16(cap_Privacy);
 238
 239         sz += 2;
 240         ie += 2;
 241
 242         /* SSID */
 243         ie = rtw_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength, pdev_network->Ssid.Ssid, &sz);
 244
 245         /* supported rates */
 246         if (pregistrypriv->wireless_mode == WIRELESS_11ABGN) {
 247                 if (pdev_network->Configuration.DSConfig > 14)
 248                         wireless_mode = WIRELESS_11A_5N;
 249                 else
 250                         wireless_mode = WIRELESS_11BG_24N;
 251         } else {
 252                 wireless_mode = pregistrypriv->wireless_mode;
 253         }
 254
 255                 rtw_set_supported_rate(pdev_network->SupportedRates, wireless_mode);
 256
 257         rateLen = rtw_get_rateset_len(pdev_network->SupportedRates);
 258
 259         if (rateLen > 8) {
 260                 ie = rtw_set_ie(ie, _SUPPORTEDRATES_IE_, 8, pdev_network->SupportedRates, &sz);
 261                 /* ie = rtw_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8), (pdev_network->SupportedRates + 8), &sz); */
 262         } else {
 263                 ie = rtw_set_ie(ie, _SUPPORTEDRATES_IE_, rateLen, pdev_network->SupportedRates, &sz);
 264         }
 265
 266         /* DS parameter set */
 267         ie = rtw_set_ie(ie, _DSSET_IE_, 1, (u8 *)&(pdev_network->Configuration.DSConfig), &sz);
 268
 269         /* IBSS Parameter Set */
 270
 271         ie = rtw_set_ie(ie, _IBSS_PARA_IE_, 2, (u8 *)&(pdev_network->Configuration.ATIMWindow), &sz);
 272
 273         if (rateLen > 8)
 274                 ie = rtw_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8), (pdev_network->SupportedRates + 8), &sz);
 275
 276         return sz;
 277 }
 278
 279 unsigned char *rtw_get_wpa_ie(unsigned char *pie, uint *wpa_ie_len, int limit)
 280 {
 281         uint len;
 282         u16 val16;
 283         __le16 le_tmp;
 284         unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
 285         u8 *pbuf = pie;
 286         int limit_new = limit;
 287
 288         while (1) {
 289                 pbuf = rtw_get_ie(pbuf, _WPA_IE_ID_, &len, limit_new);
 290
 291                 if (pbuf) {
 292                         /* check if oui matches... */
 293                         if (!memcmp((pbuf + 2), wpa_oui_type, sizeof(wpa_oui_type)) == false)
 294                                 goto check_next_ie;
 295
 296                         /* check version... */
 297                         memcpy((u8 *)&le_tmp, (pbuf + 6), sizeof(val16));
 298
 299                         val16 = le16_to_cpu(le_tmp);
 300                         if (val16 != 0x0001)
 301                                 goto check_next_ie;
 302                         *wpa_ie_len = *(pbuf + 1);
 303                         return pbuf;
 304                 } else {
 305                         *wpa_ie_len = 0;
 306                         return NULL;
 307                 }
 308
 309 check_next_ie:
 310                 limit_new = limit - (pbuf - pie) - 2 - len;
 311                 if (limit_new <= 0)
 312                         break;
 313                 pbuf += (2 + len);
 314         }
 315         *wpa_ie_len = 0;
 316         return NULL;
 317 }
 318
 319 unsigned char *rtw_get_wpa2_ie(unsigned char *pie, uint *rsn_ie_len, int limit)
 320 {
 321         return rtw_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
 322 }
 323
 324 int rtw_get_wpa_cipher_suite(u8 *s)
 325 {
 326         if (!memcmp(s, WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
 327                 return WPA_CIPHER_NONE;
 328         if (!memcmp(s, WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
 329                 return WPA_CIPHER_WEP40;
 330         if (!memcmp(s, WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
 331                 return WPA_CIPHER_TKIP;
 332         if (!memcmp(s, WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
 333                 return WPA_CIPHER_CCMP;
 334         if (!memcmp(s, WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
 335                 return WPA_CIPHER_WEP104;
 336
 337         return 0;
 338 }
 339
 340 int rtw_get_wpa2_cipher_suite(u8 *s)
 341 {
 342         if (!memcmp(s, RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
 343                 return WPA_CIPHER_NONE;
 344         if (!memcmp(s, RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
 345                 return WPA_CIPHER_WEP40;
 346         if (!memcmp(s, RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
 347                 return WPA_CIPHER_TKIP;
 348         if (!memcmp(s, RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
 349                 return WPA_CIPHER_CCMP;
 350         if (!memcmp(s, RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
 351                 return WPA_CIPHER_WEP104;
 352
 353         return 0;
 354 }
 355
 356 int rtw_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher, int *pairwise_cipher, int *is_8021x)
 357 {
 358         int i, ret = _SUCCESS;
 359         int left, count;
 360         u8 *pos;
 361         u8 SUITE_1X[4] = {0x00, 0x50, 0xf2, 1};
 362
 363         if (wpa_ie_len <= 0) {
 364                 /* No WPA IE - fail silently */
 365                 return _FAIL;
 366         }
 367
 368         if ((*wpa_ie != _WPA_IE_ID_) || (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2)) ||
 369             (memcmp(wpa_ie + 2, RTW_WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
 370                 return _FAIL;
 371
 372         pos = wpa_ie;
 373
 374         pos += 8;
 375         left = wpa_ie_len - 8;
 376
 377         /* group_cipher */
 378         if (left >= WPA_SELECTOR_LEN) {
 379                 *group_cipher = rtw_get_wpa_cipher_suite(pos);
 380                 pos += WPA_SELECTOR_LEN;
 381                 left -= WPA_SELECTOR_LEN;
 382         } else if (left > 0) {
 383                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie length mismatch, %u too much", __func__, left));
 384                 return _FAIL;
 385         }
 386
 387         /* pairwise_cipher */
 388         if (left >= 2) {
 389                 count = get_unaligned_le16(pos);
 390                 pos += 2;
 391                 left -= 2;
 392
 393                 if (count == 0 || left < count * WPA_SELECTOR_LEN) {
 394                         RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie count botch (pairwise), "
 395                                                 "count %u left %u", __func__, count, left));
 396                         return _FAIL;
 397                 }
 398
 399                 for (i = 0; i < count; i++) {
 400                         *pairwise_cipher |= rtw_get_wpa_cipher_suite(pos);
 401
 402                         pos += WPA_SELECTOR_LEN;
 403                         left -= WPA_SELECTOR_LEN;
 404                 }
 405         } else if (left == 1) {
 406                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie too short (for key mgmt)",   __func__));
 407                 return _FAIL;
 408         }
 409
 410         if (is_8021x) {
 411                 if (left >= 6) {
 412                         pos += 2;
 413                         if (!memcmp(pos, SUITE_1X, 4)) {
 414                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s : there has 802.1x auth\n", __func__));
 415                                 *is_8021x = 1;
 416                         }
 417                 }
 418         }
 419
 420         return ret;
 421 }
 422
 423 int rtw_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher, int *pairwise_cipher, int *is_8021x)
 424 {
 425         int i, ret = _SUCCESS;
 426         int left, count;
 427         u8 *pos;
 428         u8 SUITE_1X[4] = {0x00, 0x0f, 0xac, 0x01};
 429
 430         if (rsn_ie_len <= 0) {
 431                 /* No RSN IE - fail silently */
 432                 return _FAIL;
 433         }
 434
 435         if ((*rsn_ie != _WPA2_IE_ID_) || (*(rsn_ie + 1) != (u8)(rsn_ie_len - 2)))
 436                 return _FAIL;
 437
 438         pos = rsn_ie;
 439         pos += 4;
 440         left = rsn_ie_len - 4;
 441
 442         /* group_cipher */
 443         if (left >= RSN_SELECTOR_LEN) {
 444                 *group_cipher = rtw_get_wpa2_cipher_suite(pos);
 445
 446                 pos += RSN_SELECTOR_LEN;
 447                 left -= RSN_SELECTOR_LEN;
 448
 449         } else if (left > 0) {
 450                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie length mismatch, %u too much", __func__, left));
 451                 return _FAIL;
 452         }
 453
 454         /* pairwise_cipher */
 455         if (left >= 2) {
 456                 count = get_unaligned_le16(pos);
 457                 pos += 2;
 458                 left -= 2;
 459
 460                 if (count == 0 || left < count * RSN_SELECTOR_LEN) {
 461                         RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie count botch (pairwise), "
 462                                                  "count %u left %u", __func__, count, left));
 463                         return _FAIL;
 464                 }
 465
 466                 for (i = 0; i < count; i++) {
 467                         *pairwise_cipher |= rtw_get_wpa2_cipher_suite(pos);
 468
 469                         pos += RSN_SELECTOR_LEN;
 470                         left -= RSN_SELECTOR_LEN;
 471                 }
 472
 473         } else if (left == 1) {
 474                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie too short (for key mgmt)",  __func__));
 475
 476                 return _FAIL;
 477         }
 478
 479         if (is_8021x) {
 480                 if (left >= 6) {
 481                         pos += 2;
 482                         if (!memcmp(pos, SUITE_1X, 4)) {
 483                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s (): there has 802.1x auth\n", __func__));
 484                                 *is_8021x = 1;
 485                         }
 486                 }
 487         }
 488         return ret;
 489 }
 490
 491 int rtw_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len, u8 *wpa_ie, u16 *wpa_len)
 492 {
 493         u8 authmode, sec_idx, i;
 494         u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
 495         uint cnt;
 496
 497         /* Search required WPA or WPA2 IE and copy to sec_ie[] */
 498
 499         cnt = _TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_;
 500
 501         sec_idx = 0;
 502
 503         while (cnt < in_len) {
 504                 authmode = in_ie[cnt];
 505
 506                 if ((authmode == _WPA_IE_ID_) && (!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
 507                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
 508                                          ("\n rtw_get_wpa_ie: sec_idx =%d in_ie[cnt+1]+2 =%d\n",
 509                                          sec_idx, in_ie[cnt + 1] + 2));
 510
 511                                 if (wpa_ie) {
 512                                         memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 513
 514                                         for (i = 0; i < (in_ie[cnt + 1] + 2); i += 8) {
 515                                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
 516                                                          ("\n %2x,%2x,%2x,%2x,%2x,%2x,%2x,%2x\n",
 517                                                          wpa_ie[i], wpa_ie[i + 1], wpa_ie[i + 2], wpa_ie[i + 3], wpa_ie[i + 4],
 518                                                          wpa_ie[i + 5], wpa_ie[i + 6], wpa_ie[i + 7]));
 519                                         }
 520                                 }
 521
 522                                 *wpa_len = in_ie[cnt + 1] + 2;
 523                                 cnt += in_ie[cnt + 1] + 2;  /* get next */
 524                 } else {
 525                         if (authmode == _WPA2_IE_ID_) {
 526                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
 527                                          ("\n get_rsn_ie: sec_idx =%d in_ie[cnt+1]+2 =%d\n",
 528                                          sec_idx, in_ie[cnt + 1] + 2));
 529
 530                                 if (rsn_ie) {
 531                                         memcpy(rsn_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 532
 533                                         for (i = 0; i < (in_ie[cnt + 1] + 2); i += 8) {
 534                                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
 535                                                          ("\n %2x,%2x,%2x,%2x,%2x,%2x,%2x,%2x\n",
 536                                                          rsn_ie[i], rsn_ie[i + 1], rsn_ie[i + 2], rsn_ie[i + 3], rsn_ie[i + 4],
 537                                                          rsn_ie[i + 5], rsn_ie[i + 6], rsn_ie[i + 7]));
 538                                                 }
 539                                 }
 540
 541                                 *rsn_len = in_ie[cnt + 1] + 2;
 542                                 cnt += in_ie[cnt + 1] + 2;  /* get next */
 543                         } else {
 544                                 cnt += in_ie[cnt + 1] + 2;   /* get next */
 545                         }
 546                 }
 547         }
 548
 549         return *rsn_len + *wpa_len;
 550 }
 551
 552 u8 rtw_is_wps_ie(u8 *ie_ptr, uint *wps_ielen)
 553 {
 554         u8 match = false;
 555         u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
 556
 557         if (!ie_ptr)
 558                 return match;
 559
 560         eid = ie_ptr[0];
 561
 562         if ((eid == _WPA_IE_ID_) && (!memcmp(&ie_ptr[2], wps_oui, 4))) {
 563                 *wps_ielen = ie_ptr[1] + 2;
 564                 match = true;
 565         }
 566         return match;
 567 }
 568
 569 /**
 570  * rtw_get_wps_ie - Search WPS IE from a series of ies
 571  * @in_ie: Address of ies to search
 572  * @in_len: Length limit from in_ie
 573  * @wps_ie: If not NULL and WPS IE is found, WPS IE will be copied to the buf starting from wps_ie
 574  * @wps_ielen: If not NULL and WPS IE is found, will set to the length of the entire WPS IE
 575  *
 576  * Returns: The address of the WPS IE found, or NULL
 577  */
 578 u8 *rtw_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
 579 {
 580         uint cnt;
 581         u8 *wpsie_ptr = NULL;
 582         u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
 583
 584         if (wps_ielen)
 585                 *wps_ielen = 0;
 586
 587         if (!in_ie || in_len <= 0)
 588                 return wpsie_ptr;
 589
 590         cnt = 0;
 591
 592         while (cnt < in_len) {
 593                 eid = in_ie[cnt];
 594
 595                 if ((eid == _WPA_IE_ID_) && (!memcmp(&in_ie[cnt + 2], wps_oui, 4))) {
 596                         wpsie_ptr = &in_ie[cnt];
 597
 598                         if (wps_ie)
 599                                 memcpy(wps_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 600
 601                         if (wps_ielen)
 602                                 *wps_ielen = in_ie[cnt + 1] + 2;
 603
 604                         cnt += in_ie[cnt + 1] + 2;
 605
 606                         break;
 607                 } else {
 608                         cnt += in_ie[cnt + 1] + 2; /* goto next */
 609                 }
 610         }
 611         return wpsie_ptr;
 612 }
 613
 614 /**
 615  * rtw_get_wps_attr - Search a specific WPS attribute from a given WPS IE
 616  * @wps_ie: Address of WPS IE to search
 617  * @wps_ielen: Length limit from wps_ie
 618  * @target_attr_id: The attribute ID of WPS attribute to search
 619  * @buf_attr: If not NULL and the WPS attribute is found, WPS attribute will be copied to the buf starting from buf_attr
 620  * @len_attr: If not NULL and the WPS attribute is found, will set to the length of the entire WPS attribute
 621  *
 622  * Returns: the address of the specific WPS attribute found, or NULL
 623  */
 624 u8 *rtw_get_wps_attr(u8 *wps_ie, uint wps_ielen, u16 target_attr_id, u8 *buf_attr, u32 *len_attr)
 625 {
 626         u8 *attr_ptr = NULL;
 627         u8 *target_attr_ptr = NULL;
 628         u8 wps_oui[4] = {0x00, 0x50, 0xF2, 0x04};
 629
 630         if (len_attr)
 631                 *len_attr = 0;
 632
 633         if ((wps_ie[0] != _VENDOR_SPECIFIC_IE_) ||
 634             (memcmp(wps_ie + 2, wps_oui, 4)))
 635                 return attr_ptr;
 636
 637         /*  6 = 1(Element ID) + 1(Length) + 4(WPS OUI) */
 638         attr_ptr = wps_ie + 6; /* goto first attr */
 639
 640         while (attr_ptr - wps_ie < wps_ielen) {
 641                 /*  4 = 2(Attribute ID) + 2(Length) */
 642                 u16 attr_id = get_unaligned_be16(attr_ptr);
 643                 u16 attr_data_len = get_unaligned_be16(attr_ptr + 2);
 644                 u16 attr_len = attr_data_len + 4;
 645
 646                 if (attr_id == target_attr_id) {
 647                         target_attr_ptr = attr_ptr;
 648                         if (buf_attr)
 649                                 memcpy(buf_attr, attr_ptr, attr_len);
 650                         if (len_attr)
 651                                 *len_attr = attr_len;
 652                         break;
 653                 } else {
 654                         attr_ptr += attr_len; /* goto next */
 655                 }
 656         }
 657         return target_attr_ptr;
 658 }
 659
 660 /**
 661  * rtw_get_wps_attr_content - Search a specific WPS attribute content from a given WPS IE
 662  * @wps_ie: Address of WPS IE to search
 663  * @wps_ielen: Length limit from wps_ie
 664  * @target_attr_id: The attribute ID of WPS attribute to search
 665  * @buf_content: If not NULL and the WPS attribute is found, WPS attribute content will be copied to the buf starting from buf_content
 666  * @len_content: If not NULL and the WPS attribute is found, will set to the length of the WPS attribute content
 667  *
 668  * Returns: the address of the specific WPS attribute content found, or NULL
 669  */
 670 u8 *rtw_get_wps_attr_content(u8 *wps_ie, uint wps_ielen, u16 target_attr_id, u8 *buf_content, uint *len_content)
 671 {
 672         u8 *attr_ptr;
 673         u32 attr_len;
 674
 675         if (len_content)
 676                 *len_content = 0;
 677
 678         attr_ptr = rtw_get_wps_attr(wps_ie, wps_ielen, target_attr_id, NULL, &attr_len);
 679
 680         if (attr_ptr && attr_len) {
 681                 if (buf_content)
 682                         memcpy(buf_content, attr_ptr + 4, attr_len - 4);
 683
 684                 if (len_content)
 685                         *len_content = attr_len - 4;
 686
 687                 return attr_ptr + 4;
 688         }
 689
 690         return NULL;
 691 }
 692
 693 static int rtw_ieee802_11_parse_vendor_specific(u8 *pos, uint elen,
 694                                             struct rtw_ieee802_11_elems *elems,
 695                                             int show_errors)
 696 {
 697         unsigned int oui;
 698
 699         /* first 3 bytes in vendor specific information element are the IEEE
 700          * OUI of the vendor. The following byte is used a vendor specific
 701          * sub-type. */
 702         if (elen < 4) {
 703                 if (show_errors) {
 704                         DBG_88E("short vendor specific information element ignored (len=%lu)\n",
 705                                 (unsigned long)elen);
 706                 }
 707                 return -1;
 708         }
 709
 710         oui = RTW_GET_BE24(pos);
 711         switch (oui) {
 712         case OUI_MICROSOFT:
 713                 /* Microsoft/Wi-Fi information elements are further typed and
 714                  * subtyped */
 715                 switch (pos[3]) {
 716                 case 1:
 717                         /* Microsoft OUI (00:50:F2) with OUI Type 1:
 718                          * real WPA information element */
 719                         elems->wpa_ie = pos;
 720                         elems->wpa_ie_len = elen;
 721                         break;
 722                 case WME_OUI_TYPE: /* this is a Wi-Fi WME info. element */
 723                         if (elen < 5) {
 724                                 DBG_88E("short WME information element ignored (len=%lu)\n",
 725                                         (unsigned long)elen);
 726                                 return -1;
 727                         }
 728                         switch (pos[4]) {
 729                         case WME_OUI_SUBTYPE_INFORMATION_ELEMENT:
 730                         case WME_OUI_SUBTYPE_PARAMETER_ELEMENT:
 731                                 elems->wme = pos;
 732                                 elems->wme_len = elen;
 733                                 break;
 734                         case WME_OUI_SUBTYPE_TSPEC_ELEMENT:
 735                                 elems->wme_tspec = pos;
 736                                 elems->wme_tspec_len = elen;
 737                                 break;
 738                         default:
 739                                 DBG_88E("unknown WME information element ignored (subtype=%d len=%lu)\n",
 740                                         pos[4], (unsigned long)elen);
 741                                 return -1;
 742                         }
 743                         break;
 744                 case 4:
 745                         /* Wi-Fi Protected Setup (WPS) IE */
 746                         elems->wps_ie = pos;
 747                         elems->wps_ie_len = elen;
 748                         break;
 749                 default:
 750                         DBG_88E("Unknown Microsoft information element ignored (type=%d len=%lu)\n",
 751                                 pos[3], (unsigned long)elen);
 752                         return -1;
 753                 }
 754                 break;
 755
 756         case OUI_BROADCOM:
 757                 switch (pos[3]) {
 758                 case VENDOR_HT_CAPAB_OUI_TYPE:
 759                         elems->vendor_ht_cap = pos;
 760                         elems->vendor_ht_cap_len = elen;
 761                         break;
 762                 default:
 763                         DBG_88E("Unknown Broadcom information element ignored (type=%d len=%lu)\n",
 764                                 pos[3], (unsigned long)elen);
 765                         return -1;
 766                 }
 767                 break;
 768         default:
 769                 DBG_88E("unknown vendor specific information element ignored (vendor OUI %3phC len=%lu)\n",
 770                         pos, (unsigned long)elen);
 771                 return -1;
 772         }
 773         return 0;
 774 }
 775
 776 /**
 777  * ieee802_11_parse_elems - Parse information elements in management frames
 778  * @start: Pointer to the start of ies
 779  * @len: Length of IE buffer in octets
 780  * @elems: Data structure for parsed elements
 781  * @show_errors: Whether to show parsing errors in debug log
 782  * Returns: Parsing result
 783  */
 784 enum parse_res rtw_ieee802_11_parse_elems(u8 *start, uint len,
 785                                 struct rtw_ieee802_11_elems *elems,
 786                                 int show_errors)
 787 {
 788         uint left = len;
 789         u8 *pos = start;
 790         int unknown = 0;
 791
 792         memset(elems, 0, sizeof(*elems));
 793
 794         while (left >= 2) {
 795                 u8 id, elen;
 796
 797                 id = *pos++;
 798                 elen = *pos++;
 799                 left -= 2;
 800
 801                 if (elen > left) {
 802                         if (show_errors) {
 803                                 DBG_88E("IEEE 802.11 element parse failed (id=%d elen=%d left=%lu)\n",
 804                                         id, elen, (unsigned long)left);
 805                         }
 806                         return ParseFailed;
 807                 }
 808
 809                 switch (id) {
 810                 case WLAN_EID_SSID:
 811                         elems->ssid = pos;
 812                         elems->ssid_len = elen;
 813                         break;
 814                 case WLAN_EID_SUPP_RATES:
 815                         elems->supp_rates = pos;
 816                         elems->supp_rates_len = elen;
 817                         break;
 818                 case WLAN_EID_FH_PARAMS:
 819                         elems->fh_params = pos;
 820                         elems->fh_params_len = elen;
 821                         break;
 822                 case WLAN_EID_DS_PARAMS:
 823                         elems->ds_params = pos;
 824                         elems->ds_params_len = elen;
 825                         break;
 826                 case WLAN_EID_CF_PARAMS:
 827                         elems->cf_params = pos;
 828                         elems->cf_params_len = elen;
 829                         break;
 830                 case WLAN_EID_TIM:
 831                         elems->tim = pos;
 832                         elems->tim_len = elen;
 833                         break;
 834                 case WLAN_EID_IBSS_PARAMS:
 835                         elems->ibss_params = pos;
 836                         elems->ibss_params_len = elen;
 837                         break;
 838                 case WLAN_EID_CHALLENGE:
 839                         elems->challenge = pos;
 840                         elems->challenge_len = elen;
 841                         break;
 842                 case WLAN_EID_ERP_INFO:
 843                         elems->erp_info = pos;
 844                         elems->erp_info_len = elen;
 845                         break;
 846                 case WLAN_EID_EXT_SUPP_RATES:
 847                         elems->ext_supp_rates = pos;
 848                         elems->ext_supp_rates_len = elen;
 849                         break;
 850                 case WLAN_EID_VENDOR_SPECIFIC:
 851                         if (rtw_ieee802_11_parse_vendor_specific(pos, elen, elems, show_errors))
 852                                 unknown++;
 853                         break;
 854                 case WLAN_EID_RSN:
 855                         elems->rsn_ie = pos;
 856                         elems->rsn_ie_len = elen;
 857                         break;
 858                 case WLAN_EID_PWR_CAPABILITY:
 859                         elems->power_cap = pos;
 860                         elems->power_cap_len = elen;
 861                         break;
 862                 case WLAN_EID_SUPPORTED_CHANNELS:
 863                         elems->supp_channels = pos;
 864                         elems->supp_channels_len = elen;
 865                         break;
 866                 case WLAN_EID_MOBILITY_DOMAIN:
 867                         elems->mdie = pos;
 868                         elems->mdie_len = elen;
 869                         break;
 870                 case WLAN_EID_FAST_BSS_TRANSITION:
 871                         elems->ftie = pos;
 872                         elems->ftie_len = elen;
 873                         break;
 874                 case WLAN_EID_TIMEOUT_INTERVAL:
 875                         elems->timeout_int = pos;
 876                         elems->timeout_int_len = elen;
 877                         break;
 878                 case WLAN_EID_HT_CAPABILITY:
 879                         elems->ht_capabilities = pos;
 880                         elems->ht_capabilities_len = elen;
 881                         break;
 882                 case WLAN_EID_HT_OPERATION:
 883                         elems->ht_operation = pos;
 884                         elems->ht_operation_len = elen;
 885                         break;
 886                 default:
 887                         unknown++;
 888                         if (!show_errors)
 889                                 break;
 890                         DBG_88E("IEEE 802.11 element parse ignored unknown element (id=%d elen=%d)\n",
 891                                 id, elen);
 892                         break;
 893                 }
 894                 left -= elen;
 895                 pos += elen;
 896         }
 897         if (left)
 898                 return ParseFailed;
 899         return unknown ? ParseUnknown : ParseOK;
 900 }
 901
 902 void rtw_macaddr_cfg(u8 *mac_addr)
 903 {
 904         u8 mac[ETH_ALEN];
 905
 906         if (!mac_addr)
 907                 return;
 908
 909         if (rtw_initmac && mac_pton(rtw_initmac, mac)) {
 910                 /* Users specify the mac address */
 911                 ether_addr_copy(mac_addr, mac);
 912         } else {
 913                 /* Use the mac address stored in the Efuse */
 914                 ether_addr_copy(mac, mac_addr);
 915         }
 916
 917         if (is_broadcast_ether_addr(mac) || is_zero_ether_addr(mac)) {
 918                 eth_random_addr(mac_addr);
 919                 DBG_88E("MAC Address from efuse error, assign random one !!!\n");
 920         }
 921
 922         DBG_88E("%s MAC Address  = %pM\n", __func__, mac_addr);
 923 }
 924
 925 static int rtw_get_cipher_info(struct wlan_network *pnetwork)
 926 {
 927         uint wpa_ielen;
 928         unsigned char *pbuf;
 929         int group_cipher = 0, pairwise_cipher = 0, is8021x = 0;
 930         int ret = _FAIL;
 931
 932         pbuf = rtw_get_wpa_ie(&pnetwork->network.ies[12], &wpa_ielen, pnetwork->network.ie_length - 12);
 933
 934         if (pbuf && (wpa_ielen > 0)) {
 935                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: wpa_ielen: %d", __func__, wpa_ielen));
 936                 if (_SUCCESS == rtw_parse_wpa_ie(pbuf, wpa_ielen + 2, &group_cipher, &pairwise_cipher, &is8021x)) {
 937                         pnetwork->BcnInfo.pairwise_cipher = pairwise_cipher;
 938                         pnetwork->BcnInfo.group_cipher = group_cipher;
 939                         pnetwork->BcnInfo.is_8021x = is8021x;
 940                         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: pnetwork->pairwise_cipher: %d, is_8021x is %d",
 941                                  __func__, pnetwork->BcnInfo.pairwise_cipher, pnetwork->BcnInfo.is_8021x));
 942                         ret = _SUCCESS;
 943                 }
 944         } else {
 945                 pbuf = rtw_get_wpa2_ie(&pnetwork->network.ies[12], &wpa_ielen, pnetwork->network.ie_length - 12);
 946
 947                 if (pbuf && (wpa_ielen > 0)) {
 948                         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("get RSN IE\n"));
 949                         if (_SUCCESS == rtw_parse_wpa2_ie(pbuf, wpa_ielen + 2, &group_cipher, &pairwise_cipher, &is8021x)) {
 950                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("get RSN IE  OK!!!\n"));
 951                                 pnetwork->BcnInfo.pairwise_cipher = pairwise_cipher;
 952                                 pnetwork->BcnInfo.group_cipher = group_cipher;
 953                                 pnetwork->BcnInfo.is_8021x = is8021x;
 954                                 RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: pnetwork->pairwise_cipher: %d,"
 955                                                         "pnetwork->group_cipher is %d, is_8021x is %d", __func__, pnetwork->BcnInfo.pairwise_cipher,
 956                                                         pnetwork->BcnInfo.group_cipher, pnetwork->BcnInfo.is_8021x));
 957                                 ret = _SUCCESS;
 958                         }
 959                 }
 960         }
 961
 962         return ret;
 963 }
 964
 965 void rtw_get_bcn_info(struct wlan_network *pnetwork)
 966 {
 967         unsigned short cap = 0;
 968         u8 bencrypt = 0;
 969         __le16 le_tmp;
 970         u16 wpa_len = 0, rsn_len = 0;
 971         struct HT_info_element *pht_info = NULL;
 972         uint len;
 973         unsigned char *p;
 974
 975         memcpy(&le_tmp, rtw_get_capability_from_ie(pnetwork->network.ies), 2);
 976         cap = le16_to_cpu(le_tmp);
 977         if (cap & WLAN_CAPABILITY_PRIVACY) {
 978                 bencrypt = 1;
 979                 pnetwork->network.Privacy = 1;
 980         } else {
 981                 pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_OPENSYS;
 982         }
 983         rtw_get_sec_ie(pnetwork->network.ies, pnetwork->network.ie_length, NULL, &rsn_len, NULL, &wpa_len);
 984         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: ssid =%s\n", __func__, pnetwork->network.Ssid.Ssid));
 985         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: wpa_len =%d rsn_len =%d\n", __func__, wpa_len, rsn_len));
 986         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: ssid =%s\n", __func__, pnetwork->network.Ssid.Ssid));
 987         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: wpa_len =%d rsn_len =%d\n", __func__, wpa_len, rsn_len));
 988
 989         if (rsn_len > 0) {
 990                 pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WPA2;
 991         } else if (wpa_len > 0) {
 992                 pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WPA;
 993         } else {
 994                 if (bencrypt)
 995                         pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WEP;
 996         }
 997         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: pnetwork->encryp_protocol is %x\n",
 998                  pnetwork->BcnInfo.encryp_protocol));
 999         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: pnetwork->encryp_protocol is %x\n",
1000                  pnetwork->BcnInfo.encryp_protocol));
1001         rtw_get_cipher_info(pnetwork);
1002
1003         /* get bwmode and ch_offset */
1004         /* parsing HT_CAP_IE */
1005         p = rtw_get_ie(pnetwork->network.ies + _FIXED_IE_LENGTH_, _HT_CAPABILITY_IE_, &len, pnetwork->network.ie_length - _FIXED_IE_LENGTH_);
1006         if (p && len > 0) {
1007                 struct ieee80211_ht_cap *ht_cap =
1008                         (struct ieee80211_ht_cap *)(p + 2);
1009
1010                 pnetwork->BcnInfo.ht_cap_info = le16_to_cpu(ht_cap->cap_info);
1011         } else {
1012                 pnetwork->BcnInfo.ht_cap_info = 0;
1013         }
1014         /* parsing HT_INFO_IE */
1015         p = rtw_get_ie(pnetwork->network.ies + _FIXED_IE_LENGTH_, _HT_ADD_INFO_IE_, &len, pnetwork->network.ie_length - _FIXED_IE_LENGTH_);
1016         if (p && len > 0) {
1017                         pht_info = (struct HT_info_element *)(p + 2);
1018                         pnetwork->BcnInfo.ht_info_infos_0 = pht_info->infos[0];
1019         } else {
1020                         pnetwork->BcnInfo.ht_info_infos_0 = 0;
1021         }
1022 }
1023
1024 /* show MCS rate, unit: 100Kbps */
1025 u16 rtw_mcs_rate(u8 rf_type, u8 bw_40MHz, u8 short_GI_20, u8 short_GI_40, unsigned char *MCS_rate)
1026 {
1027         u16 max_rate = 0;
1028
1029         if (rf_type == RF_1T1R) {
1030                 if (MCS_rate[0] & BIT(7))
1031                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 1500 : 1350) : ((short_GI_20) ? 722 : 650);
1032                 else if (MCS_rate[0] & BIT(6))
1033                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 1350 : 1215) : ((short_GI_20) ? 650 : 585);
1034                 else if (MCS_rate[0] & BIT(5))
1035                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 1200 : 1080) : ((short_GI_20) ? 578 : 520);
1036                 else if (MCS_rate[0] & BIT(4))
1037                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 900 : 810) : ((short_GI_20) ? 433 : 390);
1038                 else if (MCS_rate[0] & BIT(3))
1039                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 600 : 540) : ((short_GI_20) ? 289 : 260);
1040                 else if (MCS_rate[0] & BIT(2))
1041                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 450 : 405) : ((short_GI_20) ? 217 : 195);
1042                 else if (MCS_rate[0] & BIT(1))
1043                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 300 : 270) : ((short_GI_20) ? 144 : 130);
1044                 else if (MCS_rate[0] & BIT(0))
1045                         max_rate = (bw_40MHz) ? ((short_GI_40) ? 150 : 135) : ((short_GI_20) ? 72 : 65);
1046         } else {
1047                 if (MCS_rate[1]) {
1048                         if (MCS_rate[1] & BIT(7))
1049                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 3000 : 2700) : ((short_GI_20) ? 1444 : 1300);
1050                         else if (MCS_rate[1] & BIT(6))
1051                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 2700 : 2430) : ((short_GI_20) ? 1300 : 1170);
1052                         else if (MCS_rate[1] & BIT(5))
1053                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 2400 : 2160) : ((short_GI_20) ? 1156 : 1040);
1054                         else if (MCS_rate[1] & BIT(4))
1055                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 1800 : 1620) : ((short_GI_20) ? 867 : 780);
1056                         else if (MCS_rate[1] & BIT(3))
1057                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 1200 : 1080) : ((short_GI_20) ? 578 : 520);
1058                         else if (MCS_rate[1] & BIT(2))
1059                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 900 : 810) : ((short_GI_20) ? 433 : 390);
1060                         else if (MCS_rate[1] & BIT(1))
1061                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 600 : 540) : ((short_GI_20) ? 289 : 260);
1062                         else if (MCS_rate[1] & BIT(0))
1063                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 300 : 270) : ((short_GI_20) ? 144 : 130);
1064                 } else {
1065                         if (MCS_rate[0] & BIT(7))
1066                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 1500 : 1350) : ((short_GI_20) ? 722 : 650);
1067                         else if (MCS_rate[0] & BIT(6))
1068                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 1350 : 1215) : ((short_GI_20) ? 650 : 585);
1069                         else if (MCS_rate[0] & BIT(5))
1070                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 1200 : 1080) : ((short_GI_20) ? 578 : 520);
1071                         else if (MCS_rate[0] & BIT(4))
1072                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 900 : 810) : ((short_GI_20) ? 433 : 390);
1073                         else if (MCS_rate[0] & BIT(3))
1074                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 600 : 540) : ((short_GI_20) ? 289 : 260);
1075                         else if (MCS_rate[0] & BIT(2))
1076                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 450 : 405) : ((short_GI_20) ? 217 : 195);
1077                         else if (MCS_rate[0] & BIT(1))
1078                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 300 : 270) : ((short_GI_20) ? 144 : 130);
1079                         else if (MCS_rate[0] & BIT(0))
1080                                 max_rate = (bw_40MHz) ? ((short_GI_40) ? 150 : 135) : ((short_GI_20) ? 72 : 65);
1081                 }
1082         }
1083         return max_rate;
1084 }