text: /******************************************************************************
   *
   * Copyright(c) 2007 - 2011 Realtek Corporation. All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
   * more details.
   *
   ******************************************************************************/
  #define _IEEE80211_C
  
  #include <linux/ieee80211.h>
  
  #include <drv_types.h>
  #include <osdep_intf.h>
  #include <ieee80211.h>
  #include <wifi.h>
  #include <osdep_service.h>
  #include <wlan_bssdef.h>
  
  u8 RTW_WPA_OUI_TYPE[] = { 0x00, 0x50, 0xf2, 1 };
  u8 WPA_AUTH_KEY_MGMT_NONE[] = { 0x00, 0x50, 0xf2, 0 };
  u8 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X[] = { 0x00, 0x50, 0xf2, 1 };
  u8 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X[] = { 0x00, 0x50, 0xf2, 2 };
  u8 WPA_CIPHER_SUITE_NONE[] = { 0x00, 0x50, 0xf2, 0 };
  u8 WPA_CIPHER_SUITE_WEP40[] = { 0x00, 0x50, 0xf2, 1 };
  u8 WPA_CIPHER_SUITE_TKIP[] = { 0x00, 0x50, 0xf2, 2 };
  u8 WPA_CIPHER_SUITE_WRAP[] = { 0x00, 0x50, 0xf2, 3 };
  u8 WPA_CIPHER_SUITE_CCMP[] = { 0x00, 0x50, 0xf2, 4 };
  u8 WPA_CIPHER_SUITE_WEP104[] = { 0x00, 0x50, 0xf2, 5 };
  
  u16 RSN_VERSION_BSD = 1;
  u8 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X[] = { 0x00, 0x0f, 0xac, 1 };
  u8 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X[] = { 0x00, 0x0f, 0xac, 2 };
  u8 RSN_CIPHER_SUITE_NONE[] = { 0x00, 0x0f, 0xac, 0 };
  u8 RSN_CIPHER_SUITE_WEP40[] = { 0x00, 0x0f, 0xac, 1 };
  u8 RSN_CIPHER_SUITE_TKIP[] = { 0x00, 0x0f, 0xac, 2 };
  u8 RSN_CIPHER_SUITE_WRAP[] = { 0x00, 0x0f, 0xac, 3 };
  u8 RSN_CIPHER_SUITE_CCMP[] = { 0x00, 0x0f, 0xac, 4 };
  u8 RSN_CIPHER_SUITE_WEP104[] = { 0x00, 0x0f, 0xac, 5 };
  /*  */
  /*  for adhoc-master to generate ie and provide supported-rate to fw */
  /*  */
  
  static u8	WIFI_CCKRATES[] = {
  	(IEEE80211_CCK_RATE_1MB | IEEE80211_BASIC_RATE_MASK),
  	(IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK),
  	(IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK),
  	(IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK)
  	};
  
  static u8	WIFI_OFDMRATES[] = {
  	 (IEEE80211_OFDM_RATE_6MB),
  	 (IEEE80211_OFDM_RATE_9MB),
  	 (IEEE80211_OFDM_RATE_12MB),
  	 (IEEE80211_OFDM_RATE_18MB),
  	 (IEEE80211_OFDM_RATE_24MB),
  	 IEEE80211_OFDM_RATE_36MB,
  	 IEEE80211_OFDM_RATE_48MB,
  	 IEEE80211_OFDM_RATE_54MB
  	};
  
  
  int rtw_get_bit_value_from_ieee_value(u8 val)
  {
  	unsigned char dot11_rate_table[] = {
  		2, 4, 11, 22, 12, 18, 24, 36, 48,
  		72, 96, 108, 0}; /*  last element must be zero!! */
  	int i = 0;
  
  	while (dot11_rate_table[i] != 0) {
  		if (dot11_rate_table[i] == val)
  			return BIT(i);
  		i++;
  	}
  	return 0;
  }
  
  uint	rtw_is_cckrates_included(u8 *rate)
  {
  	u32	i = 0;
  
  	while (rate[i] != 0) {
  		if  ((((rate[i]) & 0x7f) == 2) || (((rate[i]) & 0x7f) == 4) ||
  		     (((rate[i]) & 0x7f) == 11)  || (((rate[i]) & 0x7f) == 22))
  			return true;
  		i++;
  	}
  	return false;
  }
  
  uint	rtw_is_cckratesonly_included(u8 *rate)
  {
  	u32 i = 0;
  
  	while (rate[i] != 0) {
  		if  ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
  		     (((rate[i]) & 0x7f) != 11)  && (((rate[i]) & 0x7f) != 22))
  			return false;
  		i++;
  	}
  
  	return true;
  }
  
  int rtw_check_network_type(unsigned char *rate, int ratelen, int channel)
  {
  	if (channel > 14) {
  		if ((rtw_is_cckrates_included(rate)) == true)
  			return WIRELESS_INVALID;
  		else
  			return WIRELESS_11A;
  	} else {  /*  could be pure B, pure G, or B/G */
  		if ((rtw_is_cckratesonly_included(rate)) == true)
  			return WIRELESS_11B;
  		else if ((rtw_is_cckrates_included(rate)) == true)
  			return	WIRELESS_11BG;
  		else
  			return WIRELESS_11G;
  	}
  }
  
  u8 *rtw_set_fixed_ie(void *pbuf, unsigned int len, void *source,
  		     unsigned int *frlen)
  {
  	memcpy(pbuf, source, len);
  	*frlen = *frlen + len;
  	return ((u8 *)pbuf) + len;
  }
  
  /*  rtw_set_ie will update frame length */
  u8 *rtw_set_ie
  (
  	u8 *pbuf,
  	int index,
  	uint len,
  	u8 *source,
  	uint *frlen /* frame length */
  )
  {
  	*pbuf = (u8)index;
  
  	*(pbuf + 1) = (u8)len;
  
  	if (len > 0)
  		memcpy((void *)(pbuf + 2), (void *)source, len);
  
  	*frlen = *frlen + (len + 2);
  
  	return pbuf + len + 2;
  }
  
  /*----------------------------------------------------------------------------
  index: the information element id index, limit is the limit for search
  -----------------------------------------------------------------------------*/
  u8 *rtw_get_ie(u8 *pbuf, int index, int *len, int limit)
  {
  	int tmp, i;
  	u8 *p;
  
  	if (limit < 1)
  		return NULL;
  
  	p = pbuf;
  	i = 0;
  	*len = 0;
  	while (1) {
  		if (*p == index) {
  			*len = *(p + 1);
  			return p;
  		} else {
  			tmp = *(p + 1);
  			p += (tmp + 2);
  			i += (tmp + 2);
  		}
  		if (i >= limit)
  			break;
  	}
  	return NULL;
  }
  
  void rtw_set_supported_rate(u8 *SupportedRates, uint mode)
  {
  
  	memset(SupportedRates, 0, NDIS_802_11_LENGTH_RATES_EX);
  
  	switch (mode) {
  	case WIRELESS_11B:
  		memcpy(SupportedRates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
  		break;
  	case WIRELESS_11G:
  	case WIRELESS_11A:
  	case WIRELESS_11_5N:
  	case WIRELESS_11A_5N:/* Todo: no basic rate for ofdm ? */
  		memcpy(SupportedRates, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
  		break;
  	case WIRELESS_11BG:
  	case WIRELESS_11G_24N:
  	case WIRELESS_11_24N:
  	case WIRELESS_11BG_24N:
  		memcpy(SupportedRates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
  		memcpy(SupportedRates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
  		break;
  	}
  }
  
  uint	rtw_get_rateset_len(u8	*rateset)
  {
  	uint i = 0;
  
  	while (1) {
  		if ((rateset[i]) == 0)
  			break;
  		if (i > 12)
  			break;
  		i++;
  	}
  	return i;
  }
  
  int rtw_generate_ie(struct registry_priv *pregistrypriv)
  {
  	u8	wireless_mode;
  	int	sz = 0, rateLen;
  	struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
  	u8 *ie = pdev_network->IEs;
  
  
  	/* timestamp will be inserted by hardware */
  	sz += 8;
  	ie += sz;
  
  	/* beacon interval : 2bytes */
  	*(__le16 *)ie = cpu_to_le16((u16)pdev_network->Configuration.BeaconPeriod);/* BCN_INTERVAL; */
  	sz += 2;
  	ie += 2;
  
  	/* capability info */
  	*(u16 *)ie = 0;
  
  	*(__le16 *)ie |= cpu_to_le16(cap_IBSS);
  
  	if (pregistrypriv->preamble == PREAMBLE_SHORT)
  		*(__le16 *)ie |= cpu_to_le16(cap_ShortPremble);
  
  	if (pdev_network->Privacy)
  		*(__le16 *)ie |= cpu_to_le16(cap_Privacy);
  
  	sz += 2;
  	ie += 2;
  
  	/* SSID */
  	ie = rtw_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength, pdev_network->Ssid.Ssid, &sz);
  
  	/* supported rates */
  	if (pregistrypriv->wireless_mode == WIRELESS_11ABGN) {
  		if (pdev_network->Configuration.DSConfig > 14)
  			wireless_mode = WIRELESS_11A_5N;
  		else
  			wireless_mode = WIRELESS_11BG_24N;
  	} else {
  		wireless_mode = pregistrypriv->wireless_mode;
  	}
  
  		rtw_set_supported_rate(pdev_network->SupportedRates, wireless_mode);
  
  	rateLen = rtw_get_rateset_len(pdev_network->SupportedRates);
  
  	if (rateLen > 8) {
  		ie = rtw_set_ie(ie, _SUPPORTEDRATES_IE_, 8, pdev_network->SupportedRates, &sz);
  		/* ie = rtw_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8), (pdev_network->SupportedRates + 8), &sz); */
  	} else {
  		ie = rtw_set_ie(ie, _SUPPORTEDRATES_IE_, rateLen, pdev_network->SupportedRates, &sz);
  	}
  
  	/* DS parameter set */
  	ie = rtw_set_ie(ie, _DSSET_IE_, 1, (u8 *)&(pdev_network->Configuration.DSConfig), &sz);
  
  	/* IBSS Parameter Set */
  
  	ie = rtw_set_ie(ie, _IBSS_PARA_IE_, 2, (u8 *)&(pdev_network->Configuration.ATIMWindow), &sz);
  
  	if (rateLen > 8)
  		ie = rtw_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8), (pdev_network->SupportedRates + 8), &sz);
  
  	return sz;
  }
  
  unsigned char *rtw_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
  {
  	int len;
  	u16 val16;
  	__le16 le_tmp;
  	unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
  	u8 *pbuf = pie;
  	int limit_new = limit;
  
  	while (1) {
  		pbuf = rtw_get_ie(pbuf, _WPA_IE_ID_, &len, limit_new);
  
  		if (pbuf) {
  			/* check if oui matches... */
  			if (!memcmp((pbuf + 2), wpa_oui_type, sizeof(wpa_oui_type)) == false)
  				goto check_next_ie;
  
  			/* check version... */
  			memcpy((u8 *)&le_tmp, (pbuf + 6), sizeof(val16));
  
  			val16 = le16_to_cpu(le_tmp);
  			if (val16 != 0x0001)
  				goto check_next_ie;
  			*wpa_ie_len = *(pbuf + 1);
  			return pbuf;
  		} else {
  			*wpa_ie_len = 0;
  			return NULL;
  		}
  
  check_next_ie:
  		limit_new = limit - (pbuf - pie) - 2 - len;
  		if (limit_new <= 0)
  			break;
  		pbuf += (2 + len);
  	}
  	*wpa_ie_len = 0;
  	return NULL;
  }
  
  unsigned char *rtw_get_wpa2_ie(unsigned char *pie, int *rsn_ie_len, int limit)
  {
  
  	return rtw_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
  }
  
  int rtw_get_wpa_cipher_suite(u8 *s)
  {
  	if (!memcmp(s, WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
  		return WPA_CIPHER_NONE;
  	if (!memcmp(s, WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
  		return WPA_CIPHER_WEP40;
  	if (!memcmp(s, WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
  		return WPA_CIPHER_TKIP;
  	if (!memcmp(s, WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
  		return WPA_CIPHER_CCMP;
  	if (!memcmp(s, WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
  		return WPA_CIPHER_WEP104;
  
  	return 0;
  }
  
  int rtw_get_wpa2_cipher_suite(u8 *s)
  {
  	if (!memcmp(s, RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
  		return WPA_CIPHER_NONE;
  	if (!memcmp(s, RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
  		return WPA_CIPHER_WEP40;
  	if (!memcmp(s, RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
  		return WPA_CIPHER_TKIP;
  	if (!memcmp(s, RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
  		return WPA_CIPHER_CCMP;
  	if (!memcmp(s, RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
  		return WPA_CIPHER_WEP104;
  
  	return 0;
  }
  
  
  int rtw_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher, int *pairwise_cipher, int *is_8021x)
  {
  	int i, ret = _SUCCESS;
  	int left, count;
  	u8 *pos;
  	u8 SUITE_1X[4] = {0x00, 0x50, 0xf2, 1};
  
  	if (wpa_ie_len <= 0) {
  		/* No WPA IE - fail silently */
  		return _FAIL;
  	}
  
  
  	if ((*wpa_ie != _WPA_IE_ID_) || (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2)) ||
  	    (memcmp(wpa_ie + 2, RTW_WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
  		return _FAIL;
  
  	pos = wpa_ie;
  
  	pos += 8;
  	left = wpa_ie_len - 8;
  
  
  	/* group_cipher */
  	if (left >= WPA_SELECTOR_LEN) {
  		*group_cipher = rtw_get_wpa_cipher_suite(pos);
  		pos += WPA_SELECTOR_LEN;
  		left -= WPA_SELECTOR_LEN;
  	} else if (left > 0) {
  		RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie length mismatch, %u too much", __func__, left));
  		return _FAIL;
  	}
  
  	/* pairwise_cipher */
  	if (left >= 2) {
  		count = get_unaligned_le16(pos);
  		pos += 2;
  		left -= 2;
  
  		if (count == 0 || left < count * WPA_SELECTOR_LEN) {
  			RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie count botch (pairwise), "
  						"count %u left %u", __func__, count, left));
  			return _FAIL;
  		}
  
  		for (i = 0; i < count; i++) {
  			*pairwise_cipher |= rtw_get_wpa_cipher_suite(pos);
  
  			pos += WPA_SELECTOR_LEN;
  			left -= WPA_SELECTOR_LEN;
  		}
  	} else if (left == 1) {
  		RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie too short (for key mgmt)",   __func__));
  		return _FAIL;
  	}
  
  	if (is_8021x) {
  		if (left >= 6) {
  			pos += 2;
  			if (!memcmp(pos, SUITE_1X, 4)) {
  				RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s : there has 802.1x auth\n", __func__));
  				*is_8021x = 1;
  			}
  		}
  	}
  
  	return ret;
  }
  
  int rtw_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher, int *pairwise_cipher, int *is_8021x)
  {
  	int i, ret = _SUCCESS;
  	int left, count;
  	u8 *pos;
  	u8 SUITE_1X[4] = {0x00, 0x0f, 0xac, 0x01};
  
  	if (rsn_ie_len <= 0) {
  		/* No RSN IE - fail silently */
  		return _FAIL;
  	}
  
  
  	if ((*rsn_ie != _WPA2_IE_ID_) || (*(rsn_ie + 1) != (u8)(rsn_ie_len - 2)))
  		return _FAIL;
  
  	pos = rsn_ie;
  	pos += 4;
  	left = rsn_ie_len - 4;
  
  	/* group_cipher */
  	if (left >= RSN_SELECTOR_LEN) {
  		*group_cipher = rtw_get_wpa2_cipher_suite(pos);
  
  		pos += RSN_SELECTOR_LEN;
  		left -= RSN_SELECTOR_LEN;
  
  	} else if (left > 0) {
  		RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie length mismatch, %u too much", __func__, left));
  		return _FAIL;
  	}
  
  	/* pairwise_cipher */
  	if (left >= 2) {
  		count = get_unaligned_le16(pos);
  		pos += 2;
  		left -= 2;
  
  		if (count == 0 || left < count * RSN_SELECTOR_LEN) {
  			RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie count botch (pairwise), "
  						 "count %u left %u", __func__, count, left));
  			return _FAIL;
  		}
  
  		for (i = 0; i < count; i++) {
  			*pairwise_cipher |= rtw_get_wpa2_cipher_suite(pos);
  
  			pos += RSN_SELECTOR_LEN;
  			left -= RSN_SELECTOR_LEN;
  		}
  
  	} else if (left == 1) {
  		RT_TRACE(_module_rtl871x_mlme_c_, _drv_err_, ("%s: ie too short (for key mgmt)",  __func__));
  
  		return _FAIL;
  	}
  
  	if (is_8021x) {
  		if (left >= 6) {
  			pos += 2;
  			if (!memcmp(pos, SUITE_1X, 4)) {
  				RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s (): there has 802.1x auth\n", __func__));
  				*is_8021x = 1;
  			}
  		}
  	}
  	return ret;
  }
  
  int rtw_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len, u8 *wpa_ie, u16 *wpa_len)
  {
  	u8 authmode, sec_idx, i;
  	u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
  	uint	cnt;
  
  
  	/* Search required WPA or WPA2 IE and copy to sec_ie[] */
  
  	cnt = _TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_;
  
  	sec_idx = 0;
  
  	while (cnt < in_len) {
  		authmode = in_ie[cnt];
  
  		if ((authmode == _WPA_IE_ID_) && (!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
  				RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
  					 ("\n rtw_get_wpa_ie: sec_idx =%d in_ie[cnt+1]+2 =%d\n",
  					 sec_idx, in_ie[cnt + 1] + 2));
  
  				if (wpa_ie) {
  					memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
  
  					for (i = 0; i < (in_ie[cnt + 1] + 2); i += 8) {
  						RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
  							 ("\n %2x,%2x,%2x,%2x,%2x,%2x,%2x,%2x\n",
  							 wpa_ie[i], wpa_ie[i + 1], wpa_ie[i + 2], wpa_ie[i + 3], wpa_ie[i + 4],
  							 wpa_ie[i + 5], wpa_ie[i + 6], wpa_ie[i + 7]));
  					}
  				}
  
  				*wpa_len = in_ie[cnt + 1] + 2;
  				cnt += in_ie[cnt + 1] + 2;  /* get next */
  		} else {
  			if (authmode == _WPA2_IE_ID_) {
  				RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
  					 ("\n get_rsn_ie: sec_idx =%d in_ie[cnt+1]+2 =%d\n",
  					 sec_idx, in_ie[cnt + 1] + 2));
  
  				if (rsn_ie) {
  					memcpy(rsn_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
  
  					for (i = 0; i < (in_ie[cnt + 1] + 2); i += 8) {
  						RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_,
  							 ("\n %2x,%2x,%2x,%2x,%2x,%2x,%2x,%2x\n",
  							 rsn_ie[i], rsn_ie[i + 1], rsn_ie[i + 2], rsn_ie[i + 3], rsn_ie[i + 4],
  							 rsn_ie[i + 5], rsn_ie[i + 6], rsn_ie[i + 7]));
  						}
  				}
  
  				*rsn_len = in_ie[cnt + 1] + 2;
  				cnt += in_ie[cnt + 1] + 2;  /* get next */
  			} else {
  				cnt += in_ie[cnt + 1] + 2;   /* get next */
  			}
  		}
  	}
  
  
  	return *rsn_len + *wpa_len;
  }
  
  u8 rtw_is_wps_ie(u8 *ie_ptr, uint *wps_ielen)
  {
  	u8 match = false;
  	u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
  
  	if (ie_ptr == NULL)
  		return match;
  
  	eid = ie_ptr[0];
  
  	if ((eid == _WPA_IE_ID_) && (!memcmp(&ie_ptr[2], wps_oui, 4))) {
  		*wps_ielen = ie_ptr[1] + 2;
  		match = true;
  	}
  	return match;
  }
  
  /**
   * rtw_get_wps_ie - Search WPS IE from a series of IEs
   * @in_ie: Address of IEs to search
   * @in_len: Length limit from in_ie
   * @wps_ie: If not NULL and WPS IE is found, WPS IE will be copied to the buf starting from wps_ie
   * @wps_ielen: If not NULL and WPS IE is found, will set to the length of the entire WPS IE
   *
   * Returns: The address of the WPS IE found, or NULL
   */
  u8 *rtw_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
  {
  	uint cnt;
  	u8 *wpsie_ptr = NULL;
  	u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
  
  	if (wps_ielen)
  		*wps_ielen = 0;
  
  	if (!in_ie || in_len <= 0)
  		return wpsie_ptr;
  
  	cnt = 0;
  
  	while (cnt < in_len) {
  		eid = in_ie[cnt];
  
  		if ((eid == _WPA_IE_ID_) && (!memcmp(&in_ie[cnt + 2], wps_oui, 4))) {
  			wpsie_ptr = &in_ie[cnt];
  
  			if (wps_ie)
  				memcpy(wps_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
  
  			if (wps_ielen)
  				*wps_ielen = in_ie[cnt + 1] + 2;
  
  			cnt += in_ie[cnt + 1] + 2;
  
  			break;
  		} else {
  			cnt += in_ie[cnt + 1] + 2; /* goto next */
  		}
  	}
  	return wpsie_ptr;
  }
  
  /**
   * rtw_get_wps_attr - Search a specific WPS attribute from a given WPS IE
   * @wps_ie: Address of WPS IE to search
   * @wps_ielen: Length limit from wps_ie
   * @target_attr_id: The attribute ID of WPS attribute to search
   * @buf_attr: If not NULL and the WPS attribute is found, WPS attribute will be copied to the buf starting from buf_attr
   * @len_attr: If not NULL and the WPS attribute is found, will set to the length of the entire WPS attribute
   *
   * Returns: the address of the specific WPS attribute found, or NULL
   */
  u8 *rtw_get_wps_attr(u8 *wps_ie, uint wps_ielen, u16 target_attr_id, u8 *buf_attr, u32 *len_attr)
  {
  	u8 *attr_ptr = NULL;
  	u8 *target_attr_ptr = NULL;
  	u8 wps_oui[4] = {0x00, 0x50, 0xF2, 0x04};
  
  	if (len_attr)
  		*len_attr = 0;
  
  	if ((wps_ie[0] != _VENDOR_SPECIFIC_IE_) ||
  	    (memcmp(wps_ie + 2, wps_oui, 4)))
  		return attr_ptr;
  
  	/*  6 = 1(Element ID) + 1(Length) + 4(WPS OUI) */
  	attr_ptr = wps_ie + 6; /* goto first attr */
  
  	while (attr_ptr - wps_ie < wps_ielen) {
  		/*  4 = 2(Attribute ID) + 2(Length) */
  		u16 attr_id = get_unaligned_be16(attr_ptr);
  		u16 attr_data_len = get_unaligned_be16(attr_ptr + 2);
  		u16 attr_len = attr_data_len + 4;
  
  		if (attr_id == target_attr_id) {
  			target_attr_ptr = attr_ptr;
  			if (buf_attr)
  				memcpy(buf_attr, attr_ptr, attr_len);
  			if (len_attr)
  				*len_attr = attr_len;
  			break;
  		} else {
  			attr_ptr += attr_len; /* goto next */
  		}
  	}
  	return target_attr_ptr;
  }
  
  /**
   * rtw_get_wps_attr_content - Search a specific WPS attribute content from a given WPS IE
   * @wps_ie: Address of WPS IE to search
   * @wps_ielen: Length limit from wps_ie
   * @target_attr_id: The attribute ID of WPS attribute to search
   * @buf_content: If not NULL and the WPS attribute is found, WPS attribute content will be copied to the buf starting from buf_content
   * @len_content: If not NULL and the WPS attribute is found, will set to the length of the WPS attribute content
   *
   * Returns: the address of the specific WPS attribute content found, or NULL
   */
  u8 *rtw_get_wps_attr_content(u8 *wps_ie, uint wps_ielen, u16 target_attr_id, u8 *buf_content, uint *len_content)
  {
  	u8 *attr_ptr;
  	u32 attr_len;
  
  	if (len_content)
  		*len_content = 0;
  
  	attr_ptr = rtw_get_wps_attr(wps_ie, wps_ielen, target_attr_id, NULL, &attr_len);
  
  	if (attr_ptr && attr_len) {
  		if (buf_content)
  			memcpy(buf_content, attr_ptr + 4, attr_len - 4);
  
  		if (len_content)
  			*len_content = attr_len - 4;
  
  		return attr_ptr + 4;
  	}
  
  	return NULL;
  }
  
  static int rtw_ieee802_11_parse_vendor_specific(u8 *pos, uint elen,
  					    struct rtw_ieee802_11_elems *elems,
  					    int show_errors)
  {
  	unsigned int oui;
  
  	/* first 3 bytes in vendor specific information element are the IEEE
  	 * OUI of the vendor. The following byte is used a vendor specific
  	 * sub-type. */
  	if (elen < 4) {
  		if (show_errors) {
  			DBG_88E("short vendor specific information element ignored (len=%lu)\n",
  				(unsigned long)elen);
  		}
  		return -1;
  	}
  
  	oui = RTW_GET_BE24(pos);
  	switch (oui) {
  	case OUI_MICROSOFT:
  		/* Microsoft/Wi-Fi information elements are further typed and
  		 * subtyped */
  		switch (pos[3]) {
  		case 1:
  			/* Microsoft OUI (00:50:F2) with OUI Type 1:
  			 * real WPA information element */
  			elems->wpa_ie = pos;
  			elems->wpa_ie_len = elen;
  			break;
  		case WME_OUI_TYPE: /* this is a Wi-Fi WME info. element */
  			if (elen < 5) {
  				DBG_88E("short WME information element ignored (len=%lu)\n",
  					(unsigned long)elen);
  				return -1;
  			}
  			switch (pos[4]) {
  			case WME_OUI_SUBTYPE_INFORMATION_ELEMENT:
  			case WME_OUI_SUBTYPE_PARAMETER_ELEMENT:
  				elems->wme = pos;
  				elems->wme_len = elen;
  				break;
  			case WME_OUI_SUBTYPE_TSPEC_ELEMENT:
  				elems->wme_tspec = pos;
  				elems->wme_tspec_len = elen;
  				break;
  			default:
  				DBG_88E("unknown WME information element ignored (subtype=%d len=%lu)\n",
  					pos[4], (unsigned long)elen);
  				return -1;
  			}
  			break;
  		case 4:
  			/* Wi-Fi Protected Setup (WPS) IE */
  			elems->wps_ie = pos;
  			elems->wps_ie_len = elen;
  			break;
  		default:
  			DBG_88E("Unknown Microsoft information element ignored (type=%d len=%lu)\n",
  				pos[3], (unsigned long)elen);
  			return -1;
  		}
  		break;
  
  	case OUI_BROADCOM:
  		switch (pos[3]) {
  		case VENDOR_HT_CAPAB_OUI_TYPE:
  			elems->vendor_ht_cap = pos;
  			elems->vendor_ht_cap_len = elen;
  			break;
  		default:
  			DBG_88E("Unknown Broadcom information element ignored (type=%d len=%lu)\n",
  				pos[3], (unsigned long)elen);
  			return -1;
  		}
  		break;
  	default:
  		DBG_88E("unknown vendor specific information element ignored (vendor OUI %3phC len=%lu)\n",
  			pos, (unsigned long)elen);
  		return -1;
  	}
  	return 0;
  }
  
  /**
   * ieee802_11_parse_elems - Parse information elements in management frames
   * @start: Pointer to the start of IEs
   * @len: Length of IE buffer in octets
   * @elems: Data structure for parsed elements
   * @show_errors: Whether to show parsing errors in debug log
   * Returns: Parsing result
   */
  enum parse_res rtw_ieee802_11_parse_elems(u8 *start, uint len,
  				struct rtw_ieee802_11_elems *elems,
  				int show_errors)
  {
  	uint left = len;
  	u8 *pos = start;
  	int unknown = 0;
  
  	memset(elems, 0, sizeof(*elems));
  
  	while (left >= 2) {
  		u8 id, elen;
  
  		id = *pos++;
  		elen = *pos++;
  		left -= 2;
  
  		if (elen > left) {
  			if (show_errors) {
  				DBG_88E("IEEE 802.11 element parse failed (id=%d elen=%d left=%lu)\n",
  					id, elen, (unsigned long)left);
  			}
  			return ParseFailed;
  		}
  
  		switch (id) {
  		case WLAN_EID_SSID:
  			elems->ssid = pos;
  			elems->ssid_len = elen;
  			break;
  		case WLAN_EID_SUPP_RATES:
  			elems->supp_rates = pos;
  			elems->supp_rates_len = elen;
  			break;
  		case WLAN_EID_FH_PARAMS:
  			elems->fh_params = pos;
  			elems->fh_params_len = elen;
  			break;
  		case WLAN_EID_DS_PARAMS:
  			elems->ds_params = pos;
  			elems->ds_params_len = elen;
  			break;
  		case WLAN_EID_CF_PARAMS:
  			elems->cf_params = pos;
  			elems->cf_params_len = elen;
  			break;
  		case WLAN_EID_TIM:
  			elems->tim = pos;
  			elems->tim_len = elen;
  			break;
  		case WLAN_EID_IBSS_PARAMS:
  			elems->ibss_params = pos;
  			elems->ibss_params_len = elen;
  			break;
  		case WLAN_EID_CHALLENGE:
  			elems->challenge = pos;
  			elems->challenge_len = elen;
  			break;
  		case WLAN_EID_ERP_INFO:
  			elems->erp_info = pos;
  			elems->erp_info_len = elen;
  			break;
  		case WLAN_EID_EXT_SUPP_RATES:
  			elems->ext_supp_rates = pos;
  			elems->ext_supp_rates_len = elen;
  			break;
  		case WLAN_EID_VENDOR_SPECIFIC:
  			if (rtw_ieee802_11_parse_vendor_specific(pos, elen, elems, show_errors))
  				unknown++;
  			break;
  		case WLAN_EID_RSN:
  			elems->rsn_ie = pos;
  			elems->rsn_ie_len = elen;
  			break;
  		case WLAN_EID_PWR_CAPABILITY:
  			elems->power_cap = pos;
  			elems->power_cap_len = elen;
  			break;
  		case WLAN_EID_SUPPORTED_CHANNELS:
  			elems->supp_channels = pos;
  			elems->supp_channels_len = elen;
  			break;
  		case WLAN_EID_MOBILITY_DOMAIN:
  			elems->mdie = pos;
  			elems->mdie_len = elen;
  			break;
  		case WLAN_EID_FAST_BSS_TRANSITION:
  			elems->ftie = pos;
  			elems->ftie_len = elen;
  			break;
  		case WLAN_EID_TIMEOUT_INTERVAL:
  			elems->timeout_int = pos;
  			elems->timeout_int_len = elen;
  			break;
  		case WLAN_EID_HT_CAPABILITY:
  			elems->ht_capabilities = pos;
  			elems->ht_capabilities_len = elen;
  			break;
  		case WLAN_EID_HT_OPERATION:
  			elems->ht_operation = pos;
  			elems->ht_operation_len = elen;
  			break;
  		default:
  			unknown++;
  			if (!show_errors)
  				break;
  			DBG_88E("IEEE 802.11 element parse ignored unknown element (id=%d elen=%d)\n",
  				id, elen);
  			break;
  		}
  		left -= elen;
  		pos += elen;
  	}
  	if (left)
  		return ParseFailed;
  	return unknown ? ParseUnknown : ParseOK;
  }
  
  void rtw_macaddr_cfg(u8 *mac_addr)
  {
  	u8 mac[ETH_ALEN];
  
  	if (mac_addr == NULL)
  		return;
  
  	if (rtw_initmac && mac_pton(rtw_initmac, mac)) {
  		/* Users specify the mac address */
  		memcpy(mac_addr, mac, ETH_ALEN);
  	} else {
  		/* Use the mac address stored in the Efuse */
  		memcpy(mac, mac_addr, ETH_ALEN);
  	}
  
  	if (((mac[0] == 0xff) && (mac[1] == 0xff) && (mac[2] == 0xff) &&
  	     (mac[3] == 0xff) && (mac[4] == 0xff) && (mac[5] == 0xff)) ||
  	    ((mac[0] == 0x0) && (mac[1] == 0x0) && (mac[2] == 0x0) &&
  	     (mac[3] == 0x0) && (mac[4] == 0x0) && (mac[5] == 0x0))) {
  		mac[0] = 0x00;
  		mac[1] = 0xe0;
  		mac[2] = 0x4c;
  		mac[3] = 0x87;
  		mac[4] = 0x00;
  		mac[5] = 0x00;
  		/*  use default mac address */
  		memcpy(mac_addr, mac, ETH_ALEN);
  		DBG_88E("MAC Address from efuse error, assign default one !!!\n");
  	}
  
  	DBG_88E("rtw_macaddr_cfg MAC Address  = %pM\n", (mac_addr));
  }
  
  /* Baron adds to avoid FreeBSD warning */
  int ieee80211_is_empty_essid(const char *essid, int essid_len)
  {
  	/* Single white space is for Linksys APs */
  	if (essid_len == 1 && essid[0] == ' ')
  		return 1;
  
  	/* Otherwise, if the entire essid is 0, we assume it is hidden */
  	while (essid_len) {
  		essid_len--;
  		if (essid[essid_len] != '\0')
  			return 0;
  	}
  
  	return 1;
  }
  
  int ieee80211_get_hdrlen(u16 fc)
  {
  	int hdrlen = 24;
  
  	switch (WLAN_FC_GET_TYPE(fc)) {
  	case RTW_IEEE80211_FTYPE_DATA:
  		if (fc & RTW_IEEE80211_STYPE_QOS_DATA)
  			hdrlen += 2;
  		if ((fc & RTW_IEEE80211_FCTL_FROMDS) && (fc & RTW_IEEE80211_FCTL_TODS))
  			hdrlen += 6; /* Addr4 */
  		break;
  	case RTW_IEEE80211_FTYPE_CTL:
  		switch (WLAN_FC_GET_STYPE(fc)) {
  		case RTW_IEEE80211_STYPE_CTS:
  		case RTW_IEEE80211_STYPE_ACK:
  			hdrlen = 10;
  			break;
  		default:
  			hdrlen = 16;
  			break;
  		}
  		break;
  	}
  
  	return hdrlen;
  }
  
  static int rtw_get_cipher_info(struct wlan_network *pnetwork)
  {
  	int wpa_ielen;
  	unsigned char *pbuf;
  	int group_cipher = 0, pairwise_cipher = 0, is8021x = 0;
  	int ret = _FAIL;
  
  	pbuf = rtw_get_wpa_ie(&pnetwork->network.IEs[12], &wpa_ielen, pnetwork->network.IELength - 12);
  
  	if (pbuf && (wpa_ielen > 0)) {
  		RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_cipher_info: wpa_ielen: %d", wpa_ielen));
  		if (_SUCCESS == rtw_parse_wpa_ie(pbuf, wpa_ielen + 2, &group_cipher, &pairwise_cipher, &is8021x)) {
  			pnetwork->BcnInfo.pairwise_cipher = pairwise_cipher;
  			pnetwork->BcnInfo.group_cipher = group_cipher;
  			pnetwork->BcnInfo.is_8021x = is8021x;
  			RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: pnetwork->pairwise_cipher: %d, is_8021x is %d",
  				 __func__, pnetwork->BcnInfo.pairwise_cipher, pnetwork->BcnInfo.is_8021x));
  			ret = _SUCCESS;
  		}
  	} else {
  		pbuf = rtw_get_wpa2_ie(&pnetwork->network.IEs[12], &wpa_ielen, pnetwork->network.IELength - 12);
  
  		if (pbuf && (wpa_ielen > 0)) {
  			RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("get RSN IE\n"));
  			if (_SUCCESS == rtw_parse_wpa2_ie(pbuf, wpa_ielen + 2, &group_cipher, &pairwise_cipher, &is8021x)) {
  				RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("get RSN IE  OK!!!\n"));
  				pnetwork->BcnInfo.pairwise_cipher = pairwise_cipher;
  				pnetwork->BcnInfo.group_cipher = group_cipher;
  				pnetwork->BcnInfo.is_8021x = is8021x;
  				RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: pnetwork->pairwise_cipher: %d,"
  							"pnetwork->group_cipher is %d, is_8021x is %d",	__func__, pnetwork->BcnInfo.pairwise_cipher,
  							pnetwork->BcnInfo.group_cipher, pnetwork->BcnInfo.is_8021x));
  				ret = _SUCCESS;
  			}
  		}
  	}
  
  	return ret;
  }
  
  void rtw_get_bcn_info(struct wlan_network *pnetwork)
  {
  	unsigned short cap = 0;
  	u8 bencrypt = 0;
  	__le16 le_tmp;
  	u16 wpa_len = 0, rsn_len = 0;
  	struct HT_info_element *pht_info = NULL;
  	int len;
  	unsigned char		*p;
  
  	memcpy(&le_tmp, rtw_get_capability_from_ie(pnetwork->network.IEs), 2);
  	cap = le16_to_cpu(le_tmp);
  	if (cap & WLAN_CAPABILITY_PRIVACY) {
  		bencrypt = 1;
  		pnetwork->network.Privacy = 1;
  	} else {
  		pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_OPENSYS;
  	}
  	rtw_get_sec_ie(pnetwork->network.IEs, pnetwork->network.IELength, NULL, &rsn_len, NULL, &wpa_len);
  	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: ssid =%s\n", pnetwork->network.Ssid.Ssid));
  	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: wpa_len =%d rsn_len =%d\n", wpa_len, rsn_len));
  	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: ssid =%s\n", pnetwork->network.Ssid.Ssid));
  	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: wpa_len =%d rsn_len =%d\n", wpa_len, rsn_len));
  
  	if (rsn_len > 0) {
  		pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WPA2;
  	} else if (wpa_len > 0) {
  		pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WPA;
  	} else {
  		if (bencrypt)
  			pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WEP;
  	}
  	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: pnetwork->encryp_protocol is %x\n",
  		 pnetwork->BcnInfo.encryp_protocol));
  	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: pnetwork->encryp_protocol is %x\n",
  		 pnetwork->BcnInfo.encryp_protocol));
  	rtw_get_cipher_info(pnetwork);
  
  	/* get bwmode and ch_offset */
  	/* parsing HT_CAP_IE */
  	p = rtw_get_ie(pnetwork->network.IEs + _FIXED_IE_LENGTH_, _HT_CAPABILITY_IE_, &len, pnetwork->network.IELength - _FIXED_IE_LENGTH_);
  	if (p && len > 0) {
  		struct ieee80211_ht_cap *ht_cap =
  			(struct ieee80211_ht_cap *)(p + 2);
  
  		pnetwork->BcnInfo.ht_cap_info = le16_to_cpu(ht_cap->cap_info);
  	} else {
  		pnetwork->BcnInfo.ht_cap_info = 0;
  	}
  	/* parsing HT_INFO_IE */
  	p = rtw_get_ie(pnetwork->network.IEs + _FIXED_IE_LENGTH_, _HT_ADD_INFO_IE_, &len, pnetwork->network.IELength - _FIXED_IE_LENGTH_);
  	if (p && len > 0) {
  			pht_info = (struct HT_info_element *)(p + 2);
  			pnetwork->BcnInfo.ht_info_infos_0 = pht_info->infos[0];
  	} else {
  			pnetwork->BcnInfo.ht_info_infos_0 = 0;
  	}
  }
  
  /* show MCS rate, unit: 100Kbps */
  u16 rtw_mcs_rate(u8 rf_type, u8 bw_40MHz, u8 short_GI_20, u8 short_GI_40, unsigned char *MCS_rate)
  {
  	u16 max_rate = 0;
  
  	if (rf_type == RF_1T1R) {
  		if (MCS_rate[0] & BIT(7))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 1500 : 1350) : ((short_GI_20) ? 722 : 650);
  		else if (MCS_rate[0] & BIT(6))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 1350 : 1215) : ((short_GI_20) ? 650 : 585);
  		else if (MCS_rate[0] & BIT(5))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 1200 : 1080) : ((short_GI_20) ? 578 : 520);
  		else if (MCS_rate[0] & BIT(4))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 900 : 810) : ((short_GI_20) ? 433 : 390);
  		else if (MCS_rate[0] & BIT(3))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 600 : 540) : ((short_GI_20) ? 289 : 260);
  		else if (MCS_rate[0] & BIT(2))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 450 : 405) : ((short_GI_20) ? 217 : 195);
  		else if (MCS_rate[0] & BIT(1))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 300 : 270) : ((short_GI_20) ? 144 : 130);
  		else if (MCS_rate[0] & BIT(0))
  			max_rate = (bw_40MHz) ? ((short_GI_40) ? 150 : 135) : ((short_GI_20) ? 72 : 65);
  	} else {
  		if (MCS_rate[1]) {
  			if (MCS_rate[1] & BIT(7))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 3000 : 2700) : ((short_GI_20) ? 1444 : 1300);
  			else if (MCS_rate[1] & BIT(6))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 2700 : 2430) : ((short_GI_20) ? 1300 : 1170);
  			else if (MCS_rate[1] & BIT(5))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 2400 : 2160) : ((short_GI_20) ? 1156 : 1040);
  			else if (MCS_rate[1] & BIT(4))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 1800 : 1620) : ((short_GI_20) ? 867 : 780);
  			else if (MCS_rate[1] & BIT(3))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 1200 : 1080) : ((short_GI_20) ? 578 : 520);
  			else if (MCS_rate[1] & BIT(2))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 900 : 810) : ((short_GI_20) ? 433 : 390);
  			else if (MCS_rate[1] & BIT(1))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 600 : 540) : ((short_GI_20) ? 289 : 260);
  			else if (MCS_rate[1] & BIT(0))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 300 : 270) : ((short_GI_20) ? 144 : 130);
  		} else {
  			if (MCS_rate[0] & BIT(7))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 1500 : 1350) : ((short_GI_20) ? 722 : 650);
  			else if (MCS_rate[0] & BIT(6))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 1350 : 1215) : ((short_GI_20) ? 650 : 585);
  			else if (MCS_rate[0] & BIT(5))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 1200 : 1080) : ((short_GI_20) ? 578 : 520);
  			else if (MCS_rate[0] & BIT(4))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 900 : 810) : ((short_GI_20) ? 433 : 390);
  			else if (MCS_rate[0] & BIT(3))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 600 : 540) : ((short_GI_20) ? 289 : 260);
  			else if (MCS_rate[0] & BIT(2))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 450 : 405) : ((short_GI_20) ? 217 : 195);
  			else if (MCS_rate[0] & BIT(1))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 300 : 270) : ((short_GI_20) ? 144 : 130);
  			else if (MCS_rate[0] & BIT(0))
  				max_rate = (bw_40MHz) ? ((short_GI_40) ? 150 : 135) : ((short_GI_20) ? 72 : 65);
  		}
  	}
  	return max_rate;
  }
  