text: /*
   * IEEE 802.11 defines
   *
   * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   * <jkmaline@cc.hut.fi>
   * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
   * Copyright (c) 2005, Devicescape Software, Inc.
   * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #ifndef LINUX_IEEE80211_H
  #define LINUX_IEEE80211_H
  
  #include <linux/types.h>
  #include <asm/byteorder.h>
  
  /*
   * DS bit usage
   *
   * TA = transmitter address
   * RA = receiver address
   * DA = destination address
   * SA = source address
   *
   * ToDS    FromDS  A1(RA)  A2(TA)  A3      A4      Use
   * -----------------------------------------------------------------
   *  0       0       DA      SA      BSSID   -       IBSS/DLS
   *  0       1       DA      BSSID   SA      -       AP -> STA
   *  1       0       BSSID   SA      DA      -       AP <- STA
   *  1       1       RA      TA      DA      SA      unspecified (WDS)
   */
  
  #define FCS_LEN 4
  
  #define IEEE80211_FCTL_VERS		0x0003
  #define IEEE80211_FCTL_FTYPE		0x000c
  #define IEEE80211_FCTL_STYPE		0x00f0
  #define IEEE80211_FCTL_TODS		0x0100
  #define IEEE80211_FCTL_FROMDS		0x0200
  #define IEEE80211_FCTL_MOREFRAGS	0x0400
  #define IEEE80211_FCTL_RETRY		0x0800
  #define IEEE80211_FCTL_PM		0x1000
  #define IEEE80211_FCTL_MOREDATA		0x2000
  #define IEEE80211_FCTL_PROTECTED	0x4000
  #define IEEE80211_FCTL_ORDER		0x8000
  
  #define IEEE80211_SCTL_FRAG		0x000F
  #define IEEE80211_SCTL_SEQ		0xFFF0
  
  #define IEEE80211_FTYPE_MGMT		0x0000
  #define IEEE80211_FTYPE_CTL		0x0004
  #define IEEE80211_FTYPE_DATA		0x0008
  
  /* management */
  #define IEEE80211_STYPE_ASSOC_REQ	0x0000
  #define IEEE80211_STYPE_ASSOC_RESP	0x0010
  #define IEEE80211_STYPE_REASSOC_REQ	0x0020
  #define IEEE80211_STYPE_REASSOC_RESP	0x0030
  #define IEEE80211_STYPE_PROBE_REQ	0x0040
  #define IEEE80211_STYPE_PROBE_RESP	0x0050
  #define IEEE80211_STYPE_BEACON		0x0080
  #define IEEE80211_STYPE_ATIM		0x0090
  #define IEEE80211_STYPE_DISASSOC	0x00A0
  #define IEEE80211_STYPE_AUTH		0x00B0
  #define IEEE80211_STYPE_DEAUTH		0x00C0
  #define IEEE80211_STYPE_ACTION		0x00D0
  
  /* control */
  #define IEEE80211_STYPE_BACK_REQ	0x0080
  #define IEEE80211_STYPE_BACK		0x0090
  #define IEEE80211_STYPE_PSPOLL		0x00A0
  #define IEEE80211_STYPE_RTS		0x00B0
  #define IEEE80211_STYPE_CTS		0x00C0
  #define IEEE80211_STYPE_ACK		0x00D0
  #define IEEE80211_STYPE_CFEND		0x00E0
  #define IEEE80211_STYPE_CFENDACK	0x00F0
  
  /* data */
  #define IEEE80211_STYPE_DATA			0x0000
  #define IEEE80211_STYPE_DATA_CFACK		0x0010
  #define IEEE80211_STYPE_DATA_CFPOLL		0x0020
  #define IEEE80211_STYPE_DATA_CFACKPOLL		0x0030
  #define IEEE80211_STYPE_NULLFUNC		0x0040
  #define IEEE80211_STYPE_CFACK			0x0050
  #define IEEE80211_STYPE_CFPOLL			0x0060
  #define IEEE80211_STYPE_CFACKPOLL		0x0070
  #define IEEE80211_STYPE_QOS_DATA		0x0080
  #define IEEE80211_STYPE_QOS_DATA_CFACK		0x0090
  #define IEEE80211_STYPE_QOS_DATA_CFPOLL		0x00A0
  #define IEEE80211_STYPE_QOS_DATA_CFACKPOLL	0x00B0
  #define IEEE80211_STYPE_QOS_NULLFUNC		0x00C0
  #define IEEE80211_STYPE_QOS_CFACK		0x00D0
  #define IEEE80211_STYPE_QOS_CFPOLL		0x00E0
  #define IEEE80211_STYPE_QOS_CFACKPOLL		0x00F0
  
  
  /* miscellaneous IEEE 802.11 constants */
  #define IEEE80211_MAX_FRAG_THRESHOLD	2352
  #define IEEE80211_MAX_RTS_THRESHOLD	2353
  #define IEEE80211_MAX_AID		2007
  #define IEEE80211_MAX_TIM_LEN		251
  /* Maximum size for the MA-UNITDATA primitive, 802.11 standard section
     6.2.1.1.2.
  
     802.11e clarifies the figure in section 7.1.2. The frame body is
     up to 2304 octets long (maximum MSDU size) plus any crypt overhead. */
  #define IEEE80211_MAX_DATA_LEN		2304
  /* 30 byte 4 addr hdr, 2 byte QoS, 2304 byte MSDU, 12 byte crypt, 4 byte FCS */
  #define IEEE80211_MAX_FRAME_LEN		2352
  
  #define IEEE80211_MAX_SSID_LEN		32
  
  #define IEEE80211_MAX_MESH_ID_LEN	32
  
  #define IEEE80211_QOS_CTL_LEN		2
  /* 1d tag mask */
  #define IEEE80211_QOS_CTL_TAG1D_MASK		0x0007
  /* TID mask */
  #define IEEE80211_QOS_CTL_TID_MASK		0x000f
  /* EOSP */
  #define IEEE80211_QOS_CTL_EOSP			0x0010
  /* ACK policy */
  #define IEEE80211_QOS_CTL_ACK_POLICY_NORMAL	0x0000
  #define IEEE80211_QOS_CTL_ACK_POLICY_NOACK	0x0020
  #define IEEE80211_QOS_CTL_ACK_POLICY_NO_EXPL	0x0040
  #define IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK	0x0060
  #define IEEE80211_QOS_CTL_ACK_POLICY_MASK	0x0060
  /* A-MSDU 802.11n */
  #define IEEE80211_QOS_CTL_A_MSDU_PRESENT	0x0080
  /* Mesh Control 802.11s */
  #define IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT  0x0100
  
  /* U-APSD queue for WMM IEs sent by AP */
  #define IEEE80211_WMM_IE_AP_QOSINFO_UAPSD	(1<<7)
  #define IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK	0x0f
  
  /* U-APSD queues for WMM IEs sent by STA */
  #define IEEE80211_WMM_IE_STA_QOSINFO_AC_VO	(1<<0)
  #define IEEE80211_WMM_IE_STA_QOSINFO_AC_VI	(1<<1)
  #define IEEE80211_WMM_IE_STA_QOSINFO_AC_BK	(1<<2)
  #define IEEE80211_WMM_IE_STA_QOSINFO_AC_BE	(1<<3)
  #define IEEE80211_WMM_IE_STA_QOSINFO_AC_MASK	0x0f
  
  /* U-APSD max SP length for WMM IEs sent by STA */
  #define IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL	0x00
  #define IEEE80211_WMM_IE_STA_QOSINFO_SP_2	0x01
  #define IEEE80211_WMM_IE_STA_QOSINFO_SP_4	0x02
  #define IEEE80211_WMM_IE_STA_QOSINFO_SP_6	0x03
  #define IEEE80211_WMM_IE_STA_QOSINFO_SP_MASK	0x03
  #define IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT	5
  
  #define IEEE80211_HT_CTL_LEN		4
  
  struct ieee80211_hdr {
  	__le16 frame_control;
  	__le16 duration_id;
  	u8 addr1[6];
  	u8 addr2[6];
  	u8 addr3[6];
  	__le16 seq_ctrl;
  	u8 addr4[6];
  } __attribute__ ((packed));
  
  struct ieee80211_hdr_3addr {
  	__le16 frame_control;
  	__le16 duration_id;
  	u8 addr1[6];
  	u8 addr2[6];
  	u8 addr3[6];
  	__le16 seq_ctrl;
  } __attribute__ ((packed));
  
  struct ieee80211_qos_hdr {
  	__le16 frame_control;
  	__le16 duration_id;
  	u8 addr1[6];
  	u8 addr2[6];
  	u8 addr3[6];
  	__le16 seq_ctrl;
  	__le16 qos_ctrl;
  } __attribute__ ((packed));
  
  /**
   * ieee80211_has_tods - check if IEEE80211_FCTL_TODS is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_tods(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_TODS)) != 0;
  }
  
  /**
   * ieee80211_has_fromds - check if IEEE80211_FCTL_FROMDS is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_fromds(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FROMDS)) != 0;
  }
  
  /**
   * ieee80211_has_a4 - check if IEEE80211_FCTL_TODS and IEEE80211_FCTL_FROMDS are set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_a4(__le16 fc)
  {
  	__le16 tmp = cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
  	return (fc & tmp) == tmp;
  }
  
  /**
   * ieee80211_has_morefrags - check if IEEE80211_FCTL_MOREFRAGS is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_morefrags(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_MOREFRAGS)) != 0;
  }
  
  /**
   * ieee80211_has_retry - check if IEEE80211_FCTL_RETRY is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_retry(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_RETRY)) != 0;
  }
  
  /**
   * ieee80211_has_pm - check if IEEE80211_FCTL_PM is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_pm(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_PM)) != 0;
  }
  
  /**
   * ieee80211_has_moredata - check if IEEE80211_FCTL_MOREDATA is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_moredata(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) != 0;
  }
  
  /**
   * ieee80211_has_protected - check if IEEE80211_FCTL_PROTECTED is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_protected(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_PROTECTED)) != 0;
  }
  
  /**
   * ieee80211_has_order - check if IEEE80211_FCTL_ORDER is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_has_order(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_ORDER)) != 0;
  }
  
  /**
   * ieee80211_is_mgmt - check if type is IEEE80211_FTYPE_MGMT
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_mgmt(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT);
  }
  
  /**
   * ieee80211_is_ctl - check if type is IEEE80211_FTYPE_CTL
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_ctl(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL);
  }
  
  /**
   * ieee80211_is_data - check if type is IEEE80211_FTYPE_DATA
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_data(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_DATA);
  }
  
  /**
   * ieee80211_is_data_qos - check if type is IEEE80211_FTYPE_DATA and IEEE80211_STYPE_QOS_DATA is set
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_data_qos(__le16 fc)
  {
  	/*
  	 * mask with QOS_DATA rather than IEEE80211_FCTL_STYPE as we just need
  	 * to check the one bit
  	 */
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_STYPE_QOS_DATA)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA);
  }
  
  /**
   * ieee80211_is_data_present - check if type is IEEE80211_FTYPE_DATA and has data
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_data_present(__le16 fc)
  {
  	/*
  	 * mask with 0x40 and test that that bit is clear to only return true
  	 * for the data-containing substypes.
  	 */
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | 0x40)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_DATA);
  }
  
  /**
   * ieee80211_is_assoc_req - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ASSOC_REQ
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_assoc_req(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ASSOC_REQ);
  }
  
  /**
   * ieee80211_is_assoc_resp - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ASSOC_RESP
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_assoc_resp(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ASSOC_RESP);
  }
  
  /**
   * ieee80211_is_reassoc_req - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_REASSOC_REQ
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_reassoc_req(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_REASSOC_REQ);
  }
  
  /**
   * ieee80211_is_reassoc_resp - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_REASSOC_RESP
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_reassoc_resp(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_REASSOC_RESP);
  }
  
  /**
   * ieee80211_is_probe_req - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_PROBE_REQ
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_probe_req(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ);
  }
  
  /**
   * ieee80211_is_probe_resp - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_PROBE_RESP
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_probe_resp(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_RESP);
  }
  
  /**
   * ieee80211_is_beacon - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_BEACON
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_beacon(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
  }
  
  /**
   * ieee80211_is_atim - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ATIM
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_atim(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ATIM);
  }
  
  /**
   * ieee80211_is_disassoc - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_DISASSOC
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_disassoc(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_DISASSOC);
  }
  
  /**
   * ieee80211_is_auth - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_AUTH
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_auth(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_AUTH);
  }
  
  /**
   * ieee80211_is_deauth - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_DEAUTH
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_deauth(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_DEAUTH);
  }
  
  /**
   * ieee80211_is_action - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ACTION
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_action(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION);
  }
  
  /**
   * ieee80211_is_back_req - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_BACK_REQ
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_back_req(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK_REQ);
  }
  
  /**
   * ieee80211_is_back - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_BACK
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_back(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
  }
  
  /**
   * ieee80211_is_pspoll - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_PSPOLL
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_pspoll(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL);
  }
  
  /**
   * ieee80211_is_rts - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_RTS
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_rts(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
  }
  
  /**
   * ieee80211_is_cts - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_CTS
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_cts(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
  }
  
  /**
   * ieee80211_is_ack - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_ACK
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_ack(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK);
  }
  
  /**
   * ieee80211_is_cfend - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_CFEND
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_cfend(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CFEND);
  }
  
  /**
   * ieee80211_is_cfendack - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_CFENDACK
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_cfendack(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CFENDACK);
  }
  
  /**
   * ieee80211_is_nullfunc - check if frame is a regular (non-QoS) nullfunc frame
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_nullfunc(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC);
  }
  
  /**
   * ieee80211_is_qos_nullfunc - check if frame is a QoS nullfunc frame
   * @fc: frame control bytes in little-endian byteorder
   */
  static inline int ieee80211_is_qos_nullfunc(__le16 fc)
  {
  	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
  	       cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
  }
  
  struct ieee80211s_hdr {
  	u8 flags;
  	u8 ttl;
  	__le32 seqnum;
  	u8 eaddr1[6];
  	u8 eaddr2[6];
  } __attribute__ ((packed));
  
  /* Mesh flags */
  #define MESH_FLAGS_AE_A4 	0x1
  #define MESH_FLAGS_AE_A5_A6	0x2
  #define MESH_FLAGS_AE		0x3
  #define MESH_FLAGS_PS_DEEP	0x4
  
  /**
   * struct ieee80211_quiet_ie
   *
   * This structure refers to "Quiet information element"
   */
  struct ieee80211_quiet_ie {
  	u8 count;
  	u8 period;
  	__le16 duration;
  	__le16 offset;
  } __attribute__ ((packed));
  
  /**
   * struct ieee80211_msrment_ie
   *
   * This structure refers to "Measurement Request/Report information element"
   */
  struct ieee80211_msrment_ie {
  	u8 token;
  	u8 mode;
  	u8 type;
  	u8 request[0];
  } __attribute__ ((packed));
  
  /**
   * struct ieee80211_channel_sw_ie
   *
   * This structure refers to "Channel Switch Announcement information element"
   */
  struct ieee80211_channel_sw_ie {
  	u8 mode;
  	u8 new_ch_num;
  	u8 count;
  } __attribute__ ((packed));
  
  /**
   * struct ieee80211_tim
   *
   * This structure refers to "Traffic Indication Map information element"
   */
  struct ieee80211_tim_ie {
  	u8 dtim_count;
  	u8 dtim_period;
  	u8 bitmap_ctrl;
  	/* variable size: 1 - 251 bytes */
  	u8 virtual_map[1];
  } __attribute__ ((packed));
  
  /**
   * struct ieee80211_meshconf_ie
   *
   * This structure refers to "Mesh Configuration information element"
   */
  struct ieee80211_meshconf_ie {
  	u8 meshconf_psel;
  	u8 meshconf_pmetric;
  	u8 meshconf_congest;
  	u8 meshconf_synch;
  	u8 meshconf_auth;
  	u8 meshconf_form;
  	u8 meshconf_cap;
  } __attribute__ ((packed));
  
  /**
   * struct ieee80211_rann_ie
   *
   * This structure refers to "Root Announcement information element"
   */
  struct ieee80211_rann_ie {
  	u8 rann_flags;
  	u8 rann_hopcount;
  	u8 rann_ttl;
  	u8 rann_addr[6];
  	u32 rann_seq;
  	u32 rann_interval;
  	u32 rann_metric;
  } __attribute__ ((packed));
  
  enum ieee80211_rann_flags {
  	RANN_FLAG_IS_GATE = 1 << 0,
  };
  
  #define WLAN_SA_QUERY_TR_ID_LEN 2
  
  struct ieee80211_mgmt {
  	__le16 frame_control;
  	__le16 duration;
  	u8 da[6];
  	u8 sa[6];
  	u8 bssid[6];
  	__le16 seq_ctrl;
  	union {
  		struct {
  			__le16 auth_alg;
  			__le16 auth_transaction;
  			__le16 status_code;
  			/* possibly followed by Challenge text */
  			u8 variable[0];
  		} __attribute__ ((packed)) auth;
  		struct {
  			__le16 reason_code;
  		} __attribute__ ((packed)) deauth;
  		struct {
  			__le16 capab_info;
  			__le16 listen_interval;
  			/* followed by SSID and Supported rates */
  			u8 variable[0];
  		} __attribute__ ((packed)) assoc_req;
  		struct {
  			__le16 capab_info;
  			__le16 status_code;
  			__le16 aid;
  			/* followed by Supported rates */
  			u8 variable[0];
  		} __attribute__ ((packed)) assoc_resp, reassoc_resp;
  		struct {
  			__le16 capab_info;
  			__le16 listen_interval;
  			u8 current_ap[6];
  			/* followed by SSID and Supported rates */
  			u8 variable[0];
  		} __attribute__ ((packed)) reassoc_req;
  		struct {
  			__le16 reason_code;
  		} __attribute__ ((packed)) disassoc;
  		struct {
  			__le64 timestamp;
  			__le16 beacon_int;
  			__le16 capab_info;
  			/* followed by some of SSID, Supported rates,
  			 * FH Params, DS Params, CF Params, IBSS Params, TIM */
  			u8 variable[0];
  		} __attribute__ ((packed)) beacon;
  		struct {
  			/* only variable items: SSID, Supported rates */
  			u8 variable[0];
  		} __attribute__ ((packed)) probe_req;
  		struct {
  			__le64 timestamp;
  			__le16 beacon_int;
  			__le16 capab_info;
  			/* followed by some of SSID, Supported rates,
  			 * FH Params, DS Params, CF Params, IBSS Params */
  			u8 variable[0];
  		} __attribute__ ((packed)) probe_resp;
  		struct {
  			u8 category;
  			union {
  				struct {
  					u8 action_code;
  					u8 dialog_token;
  					u8 status_code;
  					u8 variable[0];
  				} __attribute__ ((packed)) wme_action;
  				struct{
  					u8 action_code;
  					u8 element_id;
  					u8 length;
  					struct ieee80211_channel_sw_ie sw_elem;
  				} __attribute__((packed)) chan_switch;
  				struct{
  					u8 action_code;
  					u8 dialog_token;
  					u8 element_id;
  					u8 length;
  					struct ieee80211_msrment_ie msr_elem;
  				} __attribute__((packed)) measurement;
  				struct{
  					u8 action_code;
  					u8 dialog_token;
  					__le16 capab;
  					__le16 timeout;
  					__le16 start_seq_num;
  				} __attribute__((packed)) addba_req;
  				struct{
  					u8 action_code;
  					u8 dialog_token;
  					__le16 status;
  					__le16 capab;
  					__le16 timeout;
  				} __attribute__((packed)) addba_resp;
  				struct{
  					u8 action_code;
  					__le16 params;
  					__le16 reason_code;
  				} __attribute__((packed)) delba;
  				struct {
  					u8 action_code;
  					u8 variable[0];
  				} __attribute__((packed)) self_prot;
  				struct{
  					u8 action_code;
  					u8 variable[0];
  				} __attribute__((packed)) mesh_action;
  				struct {
  					u8 action;
  					u8 trans_id[WLAN_SA_QUERY_TR_ID_LEN];
  				} __attribute__ ((packed)) sa_query;
  				struct {
  					u8 action;
  					u8 smps_control;
  				} __attribute__ ((packed)) ht_smps;
  				struct {
  					u8 action_code;
  					u8 dialog_token;
  					__le16 capability;
  					u8 variable[0];
  				} __packed tdls_discover_resp;
  			} u;
  		} __attribute__ ((packed)) action;
  	} u;
  } __attribute__ ((packed));
  
  /* Supported Rates value encodings in 802.11n-2009 7.3.2.2 */
  #define BSS_MEMBERSHIP_SELECTOR_HT_PHY	127
  
  /* mgmt header + 1 byte category code */
  #define IEEE80211_MIN_ACTION_SIZE offsetof(struct ieee80211_mgmt, u.action.u)
  
  
  /* Management MIC information element (IEEE 802.11w) */
  struct ieee80211_mmie {
  	u8 element_id;
  	u8 length;
  	__le16 key_id;
  	u8 sequence_number[6];
  	u8 mic[8];
  } __attribute__ ((packed));
  
  struct ieee80211_vendor_ie {
  	u8 element_id;
  	u8 len;
  	u8 oui[3];
  	u8 oui_type;
  } __packed;
  
  /* Control frames */
  struct ieee80211_rts {
  	__le16 frame_control;
  	__le16 duration;
  	u8 ra[6];
  	u8 ta[6];
  } __attribute__ ((packed));
  
  struct ieee80211_cts {
  	__le16 frame_control;
  	__le16 duration;
  	u8 ra[6];
  } __attribute__ ((packed));
  
  struct ieee80211_pspoll {
  	__le16 frame_control;
  	__le16 aid;
  	u8 bssid[6];
  	u8 ta[6];
  } __attribute__ ((packed));
  
  /* TDLS */
  
  /* Link-id information element */
  struct ieee80211_tdls_lnkie {
  	u8 ie_type; /* Link Identifier IE */
  	u8 ie_len;
  	u8 bssid[6];
  	u8 init_sta[6];
  	u8 resp_sta[6];
  } __packed;
  
  struct ieee80211_tdls_data {
  	u8 da[6];
  	u8 sa[6];
  	__be16 ether_type;
  	u8 payload_type;
  	u8 category;
  	u8 action_code;
  	union {
  		struct {
  			u8 dialog_token;
  			__le16 capability;
  			u8 variable[0];
  		} __packed setup_req;
  		struct {
  			__le16 status_code;
  			u8 dialog_token;
  			__le16 capability;
  			u8 variable[0];
  		} __packed setup_resp;
  		struct {
  			__le16 status_code;
  			u8 dialog_token;
  			u8 variable[0];
  		} __packed setup_cfm;
  		struct {
  			__le16 reason_code;
  			u8 variable[0];
  		} __packed teardown;
  		struct {
  			u8 dialog_token;
  			u8 variable[0];
  		} __packed discover_req;
  	} u;
  } __packed;
  
  /**
   * struct ieee80211_bar - HT Block Ack Request
   *
   * This structure refers to "HT BlockAckReq" as
   * described in 802.11n draft section 7.2.1.7.1
   */
  struct ieee80211_bar {
  	__le16 frame_control;
  	__le16 duration;
  	__u8 ra[6];
  	__u8 ta[6];
  	__le16 control;
  	__le16 start_seq_num;
  } __attribute__((packed));
  
  /* 802.11 BAR control masks */
  #define IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL	0x0000
  #define IEEE80211_BAR_CTRL_MULTI_TID		0x0002
  #define IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA	0x0004
  #define IEEE80211_BAR_CTRL_TID_INFO_MASK	0xf000
  #define IEEE80211_BAR_CTRL_TID_INFO_SHIFT	12
  
  #define IEEE80211_HT_MCS_MASK_LEN		10
  
  /**
   * struct ieee80211_mcs_info - MCS information
   * @rx_mask: RX mask
   * @rx_highest: highest supported RX rate. If set represents
   *	the highest supported RX data rate in units of 1 Mbps.
   *	If this field is 0 this value should not be used to
   *	consider the highest RX data rate supported.
   * @tx_params: TX parameters
   */
  struct ieee80211_mcs_info {
  	u8 rx_mask[IEEE80211_HT_MCS_MASK_LEN];
  	__le16 rx_highest;
  	u8 tx_params;
  	u8 reserved[3];
  } __attribute__((packed));
  
  /* 802.11n HT capability MSC set */
  #define IEEE80211_HT_MCS_RX_HIGHEST_MASK	0x3ff
  #define IEEE80211_HT_MCS_TX_DEFINED		0x01
  #define IEEE80211_HT_MCS_TX_RX_DIFF		0x02
  /* value 0 == 1 stream etc */
  #define IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK	0x0C
  #define IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT	2
  #define		IEEE80211_HT_MCS_TX_MAX_STREAMS	4
  #define IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION	0x10
  
  /*
   * 802.11n D5.0 20.3.5 / 20.6 says:
   * - indices 0 to 7 and 32 are single spatial stream
   * - 8 to 31 are multiple spatial streams using equal modulation
   *   [8..15 for two streams, 16..23 for three and 24..31 for four]
   * - remainder are multiple spatial streams using unequal modulation
   */
  #define IEEE80211_HT_MCS_UNEQUAL_MODULATION_START 33
  #define IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE \
  	(IEEE80211_HT_MCS_UNEQUAL_MODULATION_START / 8)
  
  /**
   * struct ieee80211_ht_cap - HT capabilities
   *
   * This structure is the "HT capabilities element" as
   * described in 802.11n D5.0 7.3.2.57
   */
  struct ieee80211_ht_cap {
  	__le16 cap_info;
  	u8 ampdu_params_info;
  
  	/* 16 bytes MCS information */
  	struct ieee80211_mcs_info mcs;
  
  	__le16 extended_ht_cap_info;
  	__le32 tx_BF_cap_info;
  	u8 antenna_selection_info;
  } __attribute__ ((packed));
  
  /* 802.11n HT capabilities masks (for cap_info) */
  #define IEEE80211_HT_CAP_LDPC_CODING		0x0001
  #define IEEE80211_HT_CAP_SUP_WIDTH_20_40	0x0002
  #define IEEE80211_HT_CAP_SM_PS			0x000C
  #define		IEEE80211_HT_CAP_SM_PS_SHIFT	2
  #define IEEE80211_HT_CAP_GRN_FLD		0x0010
  #define IEEE80211_HT_CAP_SGI_20			0x0020
  #define IEEE80211_HT_CAP_SGI_40			0x0040
  #define IEEE80211_HT_CAP_TX_STBC		0x0080
  #define IEEE80211_HT_CAP_RX_STBC		0x0300
  #define		IEEE80211_HT_CAP_RX_STBC_SHIFT	8
  #define IEEE80211_HT_CAP_DELAY_BA		0x0400
  #define IEEE80211_HT_CAP_MAX_AMSDU		0x0800
  #define IEEE80211_HT_CAP_DSSSCCK40		0x1000
  #define IEEE80211_HT_CAP_RESERVED		0x2000
  #define IEEE80211_HT_CAP_40MHZ_INTOLERANT	0x4000
  #define IEEE80211_HT_CAP_LSIG_TXOP_PROT		0x8000
  
  /* 802.11n HT extended capabilities masks (for extended_ht_cap_info) */
  #define IEEE80211_HT_EXT_CAP_PCO		0x0001
  #define IEEE80211_HT_EXT_CAP_PCO_TIME		0x0006
  #define		IEEE80211_HT_EXT_CAP_PCO_TIME_SHIFT	1
  #define IEEE80211_HT_EXT_CAP_MCS_FB		0x0300
  #define		IEEE80211_HT_EXT_CAP_MCS_FB_SHIFT	8
  #define IEEE80211_HT_EXT_CAP_HTC_SUP		0x0400
  #define IEEE80211_HT_EXT_CAP_RD_RESPONDER	0x0800
  
  /* 802.11n HT capability AMPDU settings (for ampdu_params_info) */
  #define IEEE80211_HT_AMPDU_PARM_FACTOR		0x03
  #define IEEE80211_HT_AMPDU_PARM_DENSITY		0x1C
  #define		IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT	2
  
  /*
   * Maximum length of AMPDU that the STA can receive.
   * Length = 2 ^ (13 + max_ampdu_length_exp) - 1 (octets)
   */
  enum ieee80211_max_ampdu_length_exp {
  	IEEE80211_HT_MAX_AMPDU_8K = 0,
  	IEEE80211_HT_MAX_AMPDU_16K = 1,
  	IEEE80211_HT_MAX_AMPDU_32K = 2,
  	IEEE80211_HT_MAX_AMPDU_64K = 3
  };
  
  #define IEEE80211_HT_MAX_AMPDU_FACTOR 13
  
  /* Minimum MPDU start spacing */
  enum ieee80211_min_mpdu_spacing {
  	IEEE80211_HT_MPDU_DENSITY_NONE = 0,	/* No restriction */
  	IEEE80211_HT_MPDU_DENSITY_0_25 = 1,	/* 1/4 usec */
  	IEEE80211_HT_MPDU_DENSITY_0_5 = 2,	/* 1/2 usec */
  	IEEE80211_HT_MPDU_DENSITY_1 = 3,	/* 1 usec */
  	IEEE80211_HT_MPDU_DENSITY_2 = 4,	/* 2 usec */
  	IEEE80211_HT_MPDU_DENSITY_4 = 5,	/* 4 usec */
  	IEEE80211_HT_MPDU_DENSITY_8 = 6,	/* 8 usec */
  	IEEE80211_HT_MPDU_DENSITY_16 = 7	/* 16 usec */
  };
  
  /**
   * struct ieee80211_ht_info - HT information
   *
   * This structure is the "HT information element" as
   * described in 802.11n D5.0 7.3.2.58
   */
  struct ieee80211_ht_info {
  	u8 control_chan;
  	u8 ht_param;
  	__le16 operation_mode;
  	__le16 stbc_param;
  	u8 basic_set[16];
  } __attribute__ ((packed));
  
  /* for ht_param */
  #define IEEE80211_HT_PARAM_CHA_SEC_OFFSET		0x03
  #define		IEEE80211_HT_PARAM_CHA_SEC_NONE		0x00
  #define		IEEE80211_HT_PARAM_CHA_SEC_ABOVE	0x01
  #define		IEEE80211_HT_PARAM_CHA_SEC_BELOW	0x03
  #define IEEE80211_HT_PARAM_CHAN_WIDTH_ANY		0x04
  #define IEEE80211_HT_PARAM_RIFS_MODE			0x08
  #define IEEE80211_HT_PARAM_SPSMP_SUPPORT		0x10
  #define IEEE80211_HT_PARAM_SERV_INTERVAL_GRAN		0xE0
  
  /* for operation_mode */
  #define IEEE80211_HT_OP_MODE_PROTECTION			0x0003
  #define		IEEE80211_HT_OP_MODE_PROTECTION_NONE		0
  #define		IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER	1
  #define		IEEE80211_HT_OP_MODE_PROTECTION_20MHZ		2
  #define		IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED	3
  #define IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT		0x0004
  #define IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT		0x0010
  
  /* for stbc_param */
  #define IEEE80211_HT_STBC_PARAM_DUAL_BEACON		0x0040
  #define IEEE80211_HT_STBC_PARAM_DUAL_CTS_PROT		0x0080
  #define IEEE80211_HT_STBC_PARAM_STBC_BEACON		0x0100
  #define IEEE80211_HT_STBC_PARAM_LSIG_TXOP_FULLPROT	0x0200
  #define IEEE80211_HT_STBC_PARAM_PCO_ACTIVE		0x0400
  #define IEEE80211_HT_STBC_PARAM_PCO_PHASE		0x0800
  
  
  /* block-ack parameters */
  #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
  #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
  #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFC0
  #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
  #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
  
  /*
   * A-PMDU buffer sizes
   * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2)
   */
  #define IEEE80211_MIN_AMPDU_BUF 0x8
  #define IEEE80211_MAX_AMPDU_BUF 0x40
  
  
  /* Spatial Multiplexing Power Save Modes (for capability) */
  #define WLAN_HT_CAP_SM_PS_STATIC	0
  #define WLAN_HT_CAP_SM_PS_DYNAMIC	1
  #define WLAN_HT_CAP_SM_PS_INVALID	2
  #define WLAN_HT_CAP_SM_PS_DISABLED	3
  
  /* for SM power control field lower two bits */
  #define WLAN_HT_SMPS_CONTROL_DISABLED	0
  #define WLAN_HT_SMPS_CONTROL_STATIC	1
  #define WLAN_HT_SMPS_CONTROL_DYNAMIC	3
  
  /* Authentication algorithms */
  #define WLAN_AUTH_OPEN 0
  #define WLAN_AUTH_SHARED_KEY 1
  #define WLAN_AUTH_FT 2
  #define WLAN_AUTH_SAE 3
  #define WLAN_AUTH_LEAP 128
  
  #define WLAN_AUTH_CHALLENGE_LEN 128
  
  #define WLAN_CAPABILITY_ESS		(1<<0)
  #define WLAN_CAPABILITY_IBSS		(1<<1)
  
  /*
   * A mesh STA sets the ESS and IBSS capability bits to zero.
   * however, this holds true for p2p probe responses (in the p2p_find
   * phase) as well.
   */
  #define WLAN_CAPABILITY_IS_STA_BSS(cap)	\
  	(!((cap) & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)))
  
  #define WLAN_CAPABILITY_CF_POLLABLE	(1<<2)
  #define WLAN_CAPABILITY_CF_POLL_REQUEST	(1<<3)
  #define WLAN_CAPABILITY_PRIVACY		(1<<4)
  #define WLAN_CAPABILITY_SHORT_PREAMBLE	(1<<5)
  #define WLAN_CAPABILITY_PBCC		(1<<6)
  #define WLAN_CAPABILITY_CHANNEL_AGILITY	(1<<7)
  
  /* 802.11h */
  #define WLAN_CAPABILITY_SPECTRUM_MGMT	(1<<8)
  #define WLAN_CAPABILITY_QOS		(1<<9)
  #define WLAN_CAPABILITY_SHORT_SLOT_TIME	(1<<10)
  #define WLAN_CAPABILITY_DSSS_OFDM	(1<<13)
  /* measurement */
  #define IEEE80211_SPCT_MSR_RPRT_MODE_LATE	(1<<0)
  #define IEEE80211_SPCT_MSR_RPRT_MODE_INCAPABLE	(1<<1)
  #define IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED	(1<<2)
  
  #define IEEE80211_SPCT_MSR_RPRT_TYPE_BASIC	0
  #define IEEE80211_SPCT_MSR_RPRT_TYPE_CCA	1
  #define IEEE80211_SPCT_MSR_RPRT_TYPE_RPI	2
  
  
  /* 802.11g ERP information element */
  #define WLAN_ERP_NON_ERP_PRESENT (1<<0)
  #define WLAN_ERP_USE_PROTECTION (1<<1)
  #define WLAN_ERP_BARKER_PREAMBLE (1<<2)
  
  /* WLAN_ERP_BARKER_PREAMBLE values */
  enum {
  	WLAN_ERP_PREAMBLE_SHORT = 0,
  	WLAN_ERP_PREAMBLE_LONG = 1,
  };
  
  /* Status codes */
  enum ieee80211_statuscode {
  	WLAN_STATUS_SUCCESS = 0,
  	WLAN_STATUS_UNSPECIFIED_FAILURE = 1,
  	WLAN_STATUS_CAPS_UNSUPPORTED = 10,
  	WLAN_STATUS_REASSOC_NO_ASSOC = 11,
  	WLAN_STATUS_ASSOC_DENIED_UNSPEC = 12,
  	WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG = 13,
  	WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION = 14,
  	WLAN_STATUS_CHALLENGE_FAIL = 15,
  	WLAN_STATUS_AUTH_TIMEOUT = 16,
  	WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA = 17,
  	WLAN_STATUS_ASSOC_DENIED_RATES = 18,
  	/* 802.11b */
  	WLAN_STATUS_ASSOC_DENIED_NOSHORTPREAMBLE = 19,
  	WLAN_STATUS_ASSOC_DENIED_NOPBCC = 20,
  	WLAN_STATUS_ASSOC_DENIED_NOAGILITY = 21,
  	/* 802.11h */
  	WLAN_STATUS_ASSOC_DENIED_NOSPECTRUM = 22,
  	WLAN_STATUS_ASSOC_REJECTED_BAD_POWER = 23,
  	WLAN_STATUS_ASSOC_REJECTED_BAD_SUPP_CHAN = 24,
  	/* 802.11g */
  	WLAN_STATUS_ASSOC_DENIED_NOSHORTTIME = 25,
  	WLAN_STATUS_ASSOC_DENIED_NODSSSOFDM = 26,
  	/* 802.11w */
  	WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY = 30,
  	WLAN_STATUS_ROBUST_MGMT_FRAME_POLICY_VIOLATION = 31,
  	/* 802.11i */
  	WLAN_STATUS_INVALID_IE = 40,
  	WLAN_STATUS_INVALID_GROUP_CIPHER = 41,
  	WLAN_STATUS_INVALID_PAIRWISE_CIPHER = 42,
  	WLAN_STATUS_INVALID_AKMP = 43,
  	WLAN_STATUS_UNSUPP_RSN_VERSION = 44,
  	WLAN_STATUS_INVALID_RSN_IE_CAP = 45,
  	WLAN_STATUS_CIPHER_SUITE_REJECTED = 46,
  	/* 802.11e */
  	WLAN_STATUS_UNSPECIFIED_QOS = 32,
  	WLAN_STATUS_ASSOC_DENIED_NOBANDWIDTH = 33,
  	WLAN_STATUS_ASSOC_DENIED_LOWACK = 34,
  	WLAN_STATUS_ASSOC_DENIED_UNSUPP_QOS = 35,
  	WLAN_STATUS_REQUEST_DECLINED = 37,
  	WLAN_STATUS_INVALID_QOS_PARAM = 38,
  	WLAN_STATUS_CHANGE_TSPEC = 39,
  	WLAN_STATUS_WAIT_TS_DELAY = 47,
  	WLAN_STATUS_NO_DIRECT_LINK = 48,
  	WLAN_STATUS_STA_NOT_PRESENT = 49,
  	WLAN_STATUS_STA_NOT_QSTA = 50,
  	/* 802.11s */
  	WLAN_STATUS_ANTI_CLOG_REQUIRED = 76,
  	WLAN_STATUS_FCG_NOT_SUPP = 78,
  	WLAN_STATUS_STA_NO_TBTT = 78,
  };
  
  
  /* Reason codes */
  enum ieee80211_reasoncode {
  	WLAN_REASON_UNSPECIFIED = 1,
  	WLAN_REASON_PREV_AUTH_NOT_VALID = 2,
  	WLAN_REASON_DEAUTH_LEAVING = 3,
  	WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY = 4,
  	WLAN_REASON_DISASSOC_AP_BUSY = 5,
  	WLAN_REASON_CLASS2_FRAME_FROM_NONAUTH_STA = 6,
  	WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA = 7,
  	WLAN_REASON_DISASSOC_STA_HAS_LEFT = 8,
  	WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH = 9,
  	/* 802.11h */
  	WLAN_REASON_DISASSOC_BAD_POWER = 10,
  	WLAN_REASON_DISASSOC_BAD_SUPP_CHAN = 11,
  	/* 802.11i */
  	WLAN_REASON_INVALID_IE = 13,
  	WLAN_REASON_MIC_FAILURE = 14,
  	WLAN_REASON_4WAY_HANDSHAKE_TIMEOUT = 15,
  	WLAN_REASON_GROUP_KEY_HANDSHAKE_TIMEOUT = 16,
  	WLAN_REASON_IE_DIFFERENT = 17,
  	WLAN_REASON_INVALID_GROUP_CIPHER = 18,
  	WLAN_REASON_INVALID_PAIRWISE_CIPHER = 19,
  	WLAN_REASON_INVALID_AKMP = 20,
  	WLAN_REASON_UNSUPP_RSN_VERSION = 21,
  	WLAN_REASON_INVALID_RSN_IE_CAP = 22,
  	WLAN_REASON_IEEE8021X_FAILED = 23,
  	WLAN_REASON_CIPHER_SUITE_REJECTED = 24,
  	/* 802.11e */
  	WLAN_REASON_DISASSOC_UNSPECIFIED_QOS = 32,
  	WLAN_REASON_DISASSOC_QAP_NO_BANDWIDTH = 33,
  	WLAN_REASON_DISASSOC_LOW_ACK = 34,
  	WLAN_REASON_DISASSOC_QAP_EXCEED_TXOP = 35,
  	WLAN_REASON_QSTA_LEAVE_QBSS = 36,
  	WLAN_REASON_QSTA_NOT_USE = 37,
  	WLAN_REASON_QSTA_REQUIRE_SETUP = 38,
  	WLAN_REASON_QSTA_TIMEOUT = 39,
  	WLAN_REASON_QSTA_CIPHER_NOT_SUPP = 45,
  	/* 802.11s */
  	WLAN_REASON_MESH_PEER_CANCELED = 52,
  	WLAN_REASON_MESH_MAX_PEERS = 53,
  	WLAN_REASON_MESH_CONFIG = 54,
  	WLAN_REASON_MESH_CLOSE = 55,
  	WLAN_REASON_MESH_MAX_RETRIES = 56,
  	WLAN_REASON_MESH_CONFIRM_TIMEOUT = 57,
  	WLAN_REASON_MESH_INVALID_GTK = 58,
  	WLAN_REASON_MESH_INCONSISTENT_PARAM = 59,
  	WLAN_REASON_MESH_INVALID_SECURITY = 60,
  	WLAN_REASON_MESH_PATH_ERROR = 61,
  	WLAN_REASON_MESH_PATH_NOFORWARD = 62,
  	WLAN_REASON_MESH_PATH_DEST_UNREACHABLE = 63,
  	WLAN_REASON_MAC_EXISTS_IN_MBSS = 64,
  	WLAN_REASON_MESH_CHAN_REGULATORY = 65,
  	WLAN_REASON_MESH_CHAN = 66,
  };
  
  
  /* Information Element IDs */
  enum ieee80211_eid {
  	WLAN_EID_SSID = 0,
  	WLAN_EID_SUPP_RATES = 1,
  	WLAN_EID_FH_PARAMS = 2,
  	WLAN_EID_DS_PARAMS = 3,
  	WLAN_EID_CF_PARAMS = 4,
  	WLAN_EID_TIM = 5,
  	WLAN_EID_IBSS_PARAMS = 6,
  	WLAN_EID_CHALLENGE = 16,
  
  	WLAN_EID_COUNTRY = 7,
  	WLAN_EID_HP_PARAMS = 8,
  	WLAN_EID_HP_TABLE = 9,
  	WLAN_EID_REQUEST = 10,
  
  	WLAN_EID_QBSS_LOAD = 11,
  	WLAN_EID_EDCA_PARAM_SET = 12,
  	WLAN_EID_TSPEC = 13,
  	WLAN_EID_TCLAS = 14,
  	WLAN_EID_SCHEDULE = 15,
  	WLAN_EID_TS_DELAY = 43,
  	WLAN_EID_TCLAS_PROCESSING = 44,
  	WLAN_EID_QOS_CAPA = 46,
  	/* 802.11z */
  	WLAN_EID_LINK_ID = 101,
  	/* 802.11s */
  	WLAN_EID_MESH_CONFIG = 113,
  	WLAN_EID_MESH_ID = 114,
  	WLAN_EID_LINK_METRIC_REPORT = 115,
  	WLAN_EID_CONGESTION_NOTIFICATION = 116,
  	WLAN_EID_PEER_MGMT = 117,
  	WLAN_EID_CHAN_SWITCH_PARAM = 118,
  	WLAN_EID_MESH_AWAKE_WINDOW = 119,
  	WLAN_EID_BEACON_TIMING = 120,
  	WLAN_EID_MCCAOP_SETUP_REQ = 121,
  	WLAN_EID_MCCAOP_SETUP_RESP = 122,
  	WLAN_EID_MCCAOP_ADVERT = 123,
  	WLAN_EID_MCCAOP_TEARDOWN = 124,
  	WLAN_EID_GANN = 125,
  	WLAN_EID_RANN = 126,
  	WLAN_EID_PREQ = 130,
  	WLAN_EID_PREP = 131,
  	WLAN_EID_PERR = 132,
  	WLAN_EID_PXU = 137,
  	WLAN_EID_PXUC = 138,
  	WLAN_EID_AUTH_MESH_PEER_EXCH = 139,
  	WLAN_EID_MIC = 140,
  
  	WLAN_EID_PWR_CONSTRAINT = 32,
  	WLAN_EID_PWR_CAPABILITY = 33,
  	WLAN_EID_TPC_REQUEST = 34,
  	WLAN_EID_TPC_REPORT = 35,
  	WLAN_EID_SUPPORTED_CHANNELS = 36,
  	WLAN_EID_CHANNEL_SWITCH = 37,
  	WLAN_EID_MEASURE_REQUEST = 38,
  	WLAN_EID_MEASURE_REPORT = 39,
  	WLAN_EID_QUIET = 40,
  	WLAN_EID_IBSS_DFS = 41,
  
  	WLAN_EID_ERP_INFO = 42,
  	WLAN_EID_EXT_SUPP_RATES = 50,
  
  	WLAN_EID_HT_CAPABILITY = 45,
  	WLAN_EID_HT_INFORMATION = 61,
  
  	WLAN_EID_RSN = 48,
  	WLAN_EID_MMIE = 76,
  	WLAN_EID_WPA = 221,
  	WLAN_EID_GENERIC = 221,
  	WLAN_EID_VENDOR_SPECIFIC = 221,
  	WLAN_EID_QOS_PARAMETER = 222,
  
  	WLAN_EID_AP_CHAN_REPORT = 51,
  	WLAN_EID_NEIGHBOR_REPORT = 52,
  	WLAN_EID_RCPI = 53,
  	WLAN_EID_BSS_AVG_ACCESS_DELAY = 63,
  	WLAN_EID_ANTENNA_INFO = 64,
  	WLAN_EID_RSNI = 65,
  	WLAN_EID_MEASUREMENT_PILOT_TX_INFO = 66,
  	WLAN_EID_BSS_AVAILABLE_CAPACITY = 67,
  	WLAN_EID_BSS_AC_ACCESS_DELAY = 68,
  	WLAN_EID_RRM_ENABLED_CAPABILITIES = 70,
  	WLAN_EID_MULTIPLE_BSSID = 71,
  	WLAN_EID_BSS_COEX_2040 = 72,
  	WLAN_EID_OVERLAP_BSS_SCAN_PARAM = 74,
  	WLAN_EID_EXT_CAPABILITY = 127,
  
  	WLAN_EID_MOBILITY_DOMAIN = 54,
  	WLAN_EID_FAST_BSS_TRANSITION = 55,
  	WLAN_EID_TIMEOUT_INTERVAL = 56,
  	WLAN_EID_RIC_DATA = 57,
  	WLAN_EID_RIC_DESCRIPTOR = 75,
  
  	WLAN_EID_DSE_REGISTERED_LOCATION = 58,
  	WLAN_EID_SUPPORTED_REGULATORY_CLASSES = 59,
  	WLAN_EID_EXT_CHANSWITCH_ANN = 60,
  };
  
  /* Action category code */
  enum ieee80211_category {
  	WLAN_CATEGORY_SPECTRUM_MGMT = 0,
  	WLAN_CATEGORY_QOS = 1,
  	WLAN_CATEGORY_DLS = 2,
  	WLAN_CATEGORY_BACK = 3,
  	WLAN_CATEGORY_PUBLIC = 4,
  	WLAN_CATEGORY_HT = 7,
  	WLAN_CATEGORY_SA_QUERY = 8,
  	WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION = 9,
  	WLAN_CATEGORY_TDLS = 12,
  	WLAN_CATEGORY_MESH_ACTION = 13,
  	WLAN_CATEGORY_MULTIHOP_ACTION = 14,
  	WLAN_CATEGORY_SELF_PROTECTED = 15,
  	WLAN_CATEGORY_WMM = 17,
  	WLAN_CATEGORY_VENDOR_SPECIFIC_PROTECTED = 126,
  	WLAN_CATEGORY_VENDOR_SPECIFIC = 127,
  };
  
  /* SPECTRUM_MGMT action code */
  enum ieee80211_spectrum_mgmt_actioncode {
  	WLAN_ACTION_SPCT_MSR_REQ = 0,
  	WLAN_ACTION_SPCT_MSR_RPRT = 1,
  	WLAN_ACTION_SPCT_TPC_REQ = 2,
  	WLAN_ACTION_SPCT_TPC_RPRT = 3,
  	WLAN_ACTION_SPCT_CHL_SWITCH = 4,
  };
  
  /* HT action codes */
  enum ieee80211_ht_actioncode {
  	WLAN_HT_ACTION_NOTIFY_CHANWIDTH = 0,
  	WLAN_HT_ACTION_SMPS = 1,
  	WLAN_HT_ACTION_PSMP = 2,
  	WLAN_HT_ACTION_PCO_PHASE = 3,
  	WLAN_HT_ACTION_CSI = 4,
  	WLAN_HT_ACTION_NONCOMPRESSED_BF = 5,
  	WLAN_HT_ACTION_COMPRESSED_BF = 6,
  	WLAN_HT_ACTION_ASEL_IDX_FEEDBACK = 7,
  };
  
  /* Self Protected Action codes */
  enum ieee80211_self_protected_actioncode {
  	WLAN_SP_RESERVED = 0,
  	WLAN_SP_MESH_PEERING_OPEN = 1,
  	WLAN_SP_MESH_PEERING_CONFIRM = 2,
  	WLAN_SP_MESH_PEERING_CLOSE = 3,
  	WLAN_SP_MGK_INFORM = 4,
  	WLAN_SP_MGK_ACK = 5,
  };
  
  /* Mesh action codes */
  enum ieee80211_mesh_actioncode {
  	WLAN_MESH_ACTION_LINK_METRIC_REPORT,
  	WLAN_MESH_ACTION_HWMP_PATH_SELECTION,
  	WLAN_MESH_ACTION_GATE_ANNOUNCEMENT,
  	WLAN_MESH_ACTION_CONGESTION_CONTROL_NOTIFICATION,
  	WLAN_MESH_ACTION_MCCA_SETUP_REQUEST,
  	WLAN_MESH_ACTION_MCCA_SETUP_REPLY,
  	WLAN_MESH_ACTION_MCCA_ADVERTISEMENT_REQUEST,
  	WLAN_MESH_ACTION_MCCA_ADVERTISEMENT,
  	WLAN_MESH_ACTION_MCCA_TEARDOWN,
  	WLAN_MESH_ACTION_TBTT_ADJUSTMENT_REQUEST,
  	WLAN_MESH_ACTION_TBTT_ADJUSTMENT_RESPONSE,
  };
  
  /* Security key length */
  enum ieee80211_key_len {
  	WLAN_KEY_LEN_WEP40 = 5,
  	WLAN_KEY_LEN_WEP104 = 13,
  	WLAN_KEY_LEN_CCMP = 16,
  	WLAN_KEY_LEN_TKIP = 32,
  	WLAN_KEY_LEN_AES_CMAC = 16,
  };
  
  /* Public action codes */
  enum ieee80211_pub_actioncode {
  	WLAN_PUB_ACTION_TDLS_DISCOVER_RES = 14,
  };
  
  /* TDLS action codes */
  enum ieee80211_tdls_actioncode {
  	WLAN_TDLS_SETUP_REQUEST = 0,
  	WLAN_TDLS_SETUP_RESPONSE = 1,
  	WLAN_TDLS_SETUP_CONFIRM = 2,
  	WLAN_TDLS_TEARDOWN = 3,
  	WLAN_TDLS_PEER_TRAFFIC_INDICATION = 4,
  	WLAN_TDLS_CHANNEL_SWITCH_REQUEST = 5,
  	WLAN_TDLS_CHANNEL_SWITCH_RESPONSE = 6,
  	WLAN_TDLS_PEER_PSM_REQUEST = 7,
  	WLAN_TDLS_PEER_PSM_RESPONSE = 8,
  	WLAN_TDLS_PEER_TRAFFIC_RESPONSE = 9,
  	WLAN_TDLS_DISCOVERY_REQUEST = 10,
  };
  
  /*
   * TDLS capabililites to be enabled in the 5th byte of the
   * @WLAN_EID_EXT_CAPABILITY information element
   */
  #define WLAN_EXT_CAPA5_TDLS_ENABLED	BIT(5)
  #define WLAN_EXT_CAPA5_TDLS_PROHIBITED	BIT(6)
  
  /* TDLS specific payload type in the LLC/SNAP header */
  #define WLAN_TDLS_SNAP_RFTYPE	0x2
  
  /**
   * enum - mesh path selection protocol identifier
   *
   * @IEEE80211_PATH_PROTOCOL_HWMP: the default path selection protocol
   * @IEEE80211_PATH_PROTOCOL_VENDOR: a vendor specific protocol that will
   * be specified in a vendor specific information element
   */
  enum {
  	IEEE80211_PATH_PROTOCOL_HWMP = 0,
  	IEEE80211_PATH_PROTOCOL_VENDOR = 255,
  };
  
  /**
   * enum - mesh path selection metric identifier
   *
   * @IEEE80211_PATH_METRIC_AIRTIME: the default path selection metric
   * @IEEE80211_PATH_METRIC_VENDOR: a vendor specific metric that will be
   * specified in a vendor specific information element
   */
  enum {
  	IEEE80211_PATH_METRIC_AIRTIME = 0,
  	IEEE80211_PATH_METRIC_VENDOR = 255,
  };
  
  
  /*
   * IEEE 802.11-2007 7.3.2.9 Country information element
   *
   * Minimum length is 8 octets, ie len must be evenly
   * divisible by 2
   */
  
  /* Although the spec says 8 I'm seeing 6 in practice */
  #define IEEE80211_COUNTRY_IE_MIN_LEN	6
  
  /* The Country String field of the element shall be 3 octets in length */
  #define IEEE80211_COUNTRY_STRING_LEN	3
  
  /*
   * For regulatory extension stuff see IEEE 802.11-2007
   * Annex I (page 1141) and Annex J (page 1147). Also
   * review 7.3.2.9.
   *
   * When dot11RegulatoryClassesRequired is true and the
   * first_channel/reg_extension_id is >= 201 then the IE
   * compromises of the 'ext' struct represented below:
   *
   *  - Regulatory extension ID - when generating IE this just needs
   *    to be monotonically increasing for each triplet passed in
   *    the IE
   *  - Regulatory class - index into set of rules
   *  - Coverage class - index into air propagation time (Table 7-27),
   *    in microseconds, you can compute the air propagation time from
   *    the index by multiplying by 3, so index 10 yields a propagation
   *    of 10 us. Valid values are 0-31, values 32-255 are not defined
   *    yet. A value of 0 inicates air propagation of <= 1 us.
   *
   *  See also Table I.2 for Emission limit sets and table
   *  I.3 for Behavior limit sets. Table J.1 indicates how to map
   *  a reg_class to an emission limit set and behavior limit set.
   */
  #define IEEE80211_COUNTRY_EXTENSION_ID 201
  
  /*
   *  Channels numbers in the IE must be monotonically increasing
   *  if dot11RegulatoryClassesRequired is not true.
   *
   *  If dot11RegulatoryClassesRequired is true consecutive
   *  subband triplets following a regulatory triplet shall
   *  have monotonically increasing first_channel number fields.
   *
   *  Channel numbers shall not overlap.
   *
   *  Note that max_power is signed.
   */
  struct ieee80211_country_ie_triplet {
  	union {
  		struct {
  			u8 first_channel;
  			u8 num_channels;
  			s8 max_power;
  		} __attribute__ ((packed)) chans;
  		struct {
  			u8 reg_extension_id;
  			u8 reg_class;
  			u8 coverage_class;
  		} __attribute__ ((packed)) ext;
  	};
  } __attribute__ ((packed));
  
  enum ieee80211_timeout_interval_type {
  	WLAN_TIMEOUT_REASSOC_DEADLINE = 1 /* 802.11r */,
  	WLAN_TIMEOUT_KEY_LIFETIME = 2 /* 802.11r */,
  	WLAN_TIMEOUT_ASSOC_COMEBACK = 3 /* 802.11w */,
  };
  
  /* BACK action code */
  enum ieee80211_back_actioncode {
  	WLAN_ACTION_ADDBA_REQ = 0,
  	WLAN_ACTION_ADDBA_RESP = 1,
  	WLAN_ACTION_DELBA = 2,
  };
  
  /* BACK (block-ack) parties */
  enum ieee80211_back_parties {
  	WLAN_BACK_RECIPIENT = 0,
  	WLAN_BACK_INITIATOR = 1,
  };
  
  /* SA Query action */
  enum ieee80211_sa_query_action {
  	WLAN_ACTION_SA_QUERY_REQUEST = 0,
  	WLAN_ACTION_SA_QUERY_RESPONSE = 1,
  };
  
  
  /* cipher suite selectors */
  #define WLAN_CIPHER_SUITE_USE_GROUP	0x000FAC00
  #define WLAN_CIPHER_SUITE_WEP40		0x000FAC01
  #define WLAN_CIPHER_SUITE_TKIP		0x000FAC02
  /* reserved: 				0x000FAC03 */
  #define WLAN_CIPHER_SUITE_CCMP		0x000FAC04
  #define WLAN_CIPHER_SUITE_WEP104	0x000FAC05
  #define WLAN_CIPHER_SUITE_AES_CMAC	0x000FAC06
  
  #define WLAN_CIPHER_SUITE_SMS4		0x00147201
  
  /* AKM suite selectors */
  #define WLAN_AKM_SUITE_8021X		0x000FAC01
  #define WLAN_AKM_SUITE_PSK		0x000FAC02
  #define WLAN_AKM_SUITE_SAE			0x000FAC08
  #define WLAN_AKM_SUITE_FT_OVER_SAE	0x000FAC09
  
  #define WLAN_MAX_KEY_LEN		32
  
  #define WLAN_PMKID_LEN			16
  
  #define WLAN_OUI_WFA			0x506f9a
  #define WLAN_OUI_TYPE_WFA_P2P		9
  
  /*
   * WMM/802.11e Tspec Element
   */
  #define IEEE80211_WMM_IE_TSPEC_TID_MASK		0x0F
  #define IEEE80211_WMM_IE_TSPEC_TID_SHIFT	1
  
  enum ieee80211_tspec_status_code {
  	IEEE80211_TSPEC_STATUS_ADMISS_ACCEPTED = 0,
  	IEEE80211_TSPEC_STATUS_ADDTS_INVAL_PARAMS = 0x1,
  };
  
  struct ieee80211_tspec_ie {
  	u8 element_id;
  	u8 len;
  	u8 oui[3];
  	u8 oui_type;
  	u8 oui_subtype;
  	u8 version;
  	__le16 tsinfo;
  	u8 tsinfo_resvd;
  	__le16 nominal_msdu;
  	__le16 max_msdu;
  	__le32 min_service_int;
  	__le32 max_service_int;
  	__le32 inactivity_int;
  	__le32 suspension_int;
  	__le32 service_start_time;
  	__le32 min_data_rate;
  	__le32 mean_data_rate;
  	__le32 peak_data_rate;
  	__le32 max_burst_size;
  	__le32 delay_bound;
  	__le32 min_phy_rate;
  	__le16 sba;
  	__le16 medium_time;
  } __packed;
  
  /**
   * ieee80211_get_qos_ctl - get pointer to qos control bytes
   * @hdr: the frame
   *
   * The qos ctrl bytes come after the frame_control, duration, seq_num
   * and 3 or 4 addresses of length ETH_ALEN.
   * 3 addr: 2 + 2 + 2 + 3*6 = 24
   * 4 addr: 2 + 2 + 2 + 4*6 = 30
   */
  static inline u8 *ieee80211_get_qos_ctl(struct ieee80211_hdr *hdr)
  {
  	if (ieee80211_has_a4(hdr->frame_control))
  		return (u8 *)hdr + 30;
  	else
  		return (u8 *)hdr + 24;
  }
  
  /**
   * ieee80211_get_SA - get pointer to SA
   * @hdr: the frame
   *
   * Given an 802.11 frame, this function returns the offset
   * to the source address (SA). It does not verify that the
   * header is long enough to contain the address, and the
   * header must be long enough to contain the frame control
   * field.
   */
  static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
  {
  	if (ieee80211_has_a4(hdr->frame_control))
  		return hdr->addr4;
  	if (ieee80211_has_fromds(hdr->frame_control))
  		return hdr->addr3;
  	return hdr->addr2;
  }
  
  /**
   * ieee80211_get_DA - get pointer to DA
   * @hdr: the frame
   *
   * Given an 802.11 frame, this function returns the offset
   * to the destination address (DA). It does not verify that
   * the header is long enough to contain the address, and the
   * header must be long enough to contain the frame control
   * field.
   */
  static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
  {
  	if (ieee80211_has_tods(hdr->frame_control))
  		return hdr->addr3;
  	else
  		return hdr->addr1;
  }
  
  /**
   * ieee80211_is_robust_mgmt_frame - check if frame is a robust management frame
   * @hdr: the frame (buffer must include at least the first octet of payload)
   */
  static inline bool ieee80211_is_robust_mgmt_frame(struct ieee80211_hdr *hdr)
  {
  	if (ieee80211_is_disassoc(hdr->frame_control) ||
  	    ieee80211_is_deauth(hdr->frame_control))
  		return true;
  
  	if (ieee80211_is_action(hdr->frame_control)) {
  		u8 *category;
  
  		/*
  		 * Action frames, excluding Public Action frames, are Robust
  		 * Management Frames. However, if we are looking at a Protected
  		 * frame, skip the check since the data may be encrypted and
  		 * the frame has already been found to be a Robust Management
  		 * Frame (by the other end).
  		 */
  		if (ieee80211_has_protected(hdr->frame_control))
  			return true;
  		category = ((u8 *) hdr) + 24;
  		return *category != WLAN_CATEGORY_PUBLIC &&
  			*category != WLAN_CATEGORY_HT &&
  			*category != WLAN_CATEGORY_SELF_PROTECTED &&
  			*category != WLAN_CATEGORY_VENDOR_SPECIFIC;
  	}
  
  	return false;
  }
  
  /**
   * ieee80211_fhss_chan_to_freq - get channel frequency
   * @channel: the FHSS channel
   *
   * Convert IEEE802.11 FHSS channel to frequency (MHz)
   * Ref IEEE 802.11-2007 section 14.6
   */
  static inline int ieee80211_fhss_chan_to_freq(int channel)
  {
  	if ((channel > 1) && (channel < 96))
  		return channel + 2400;
  	else
  		return -1;
  }
  
  /**
   * ieee80211_freq_to_fhss_chan - get channel
   * @freq: the channels frequency
   *
   * Convert frequency (MHz) to IEEE802.11 FHSS channel
   * Ref IEEE 802.11-2007 section 14.6
   */
  static inline int ieee80211_freq_to_fhss_chan(int freq)
  {
  	if ((freq > 2401) && (freq < 2496))
  		return freq - 2400;
  	else
  		return -1;
  }
  
  /**
   * ieee80211_dsss_chan_to_freq - get channel center frequency
   * @channel: the DSSS channel
   *
   * Convert IEEE802.11 DSSS channel to the center frequency (MHz).
   * Ref IEEE 802.11-2007 section 15.6
   */
  static inline int ieee80211_dsss_chan_to_freq(int channel)
  {
  	if ((channel > 0) && (channel < 14))
  		return 2407 + (channel * 5);
  	else if (channel == 14)
  		return 2484;
  	else
  		return -1;
  }
  
  /**
   * ieee80211_freq_to_dsss_chan - get channel
   * @freq: the frequency
   *
   * Convert frequency (MHz) to IEEE802.11 DSSS channel
   * Ref IEEE 802.11-2007 section 15.6
   *
   * This routine selects the channel with the closest center frequency.
   */
  static inline int ieee80211_freq_to_dsss_chan(int freq)
  {
  	if ((freq >= 2410) && (freq < 2475))
  		return (freq - 2405) / 5;
  	else if ((freq >= 2482) && (freq < 2487))
  		return 14;
  	else
  		return -1;
  }
  
  /* Convert IEEE802.11 HR DSSS channel to frequency (MHz) and back
   * Ref IEEE 802.11-2007 section 18.4.6.2
   *
   * The channels and frequencies are the same as those defined for DSSS
   */
  #define ieee80211_hr_chan_to_freq(chan) ieee80211_dsss_chan_to_freq(chan)
  #define ieee80211_freq_to_hr_chan(freq) ieee80211_freq_to_dsss_chan(freq)
  
  /* Convert IEEE802.11 ERP channel to frequency (MHz) and back
   * Ref IEEE 802.11-2007 section 19.4.2
   */
  #define ieee80211_erp_chan_to_freq(chan) ieee80211_hr_chan_to_freq(chan)
  #define ieee80211_freq_to_erp_chan(freq) ieee80211_freq_to_hr_chan(freq)
  
  /**
   * ieee80211_ofdm_chan_to_freq - get channel center frequency
   * @s_freq: starting frequency == (dotChannelStartingFactor/2) MHz
   * @channel: the OFDM channel
   *
   * Convert IEEE802.11 OFDM channel to center frequency (MHz)
   * Ref IEEE 802.11-2007 section 17.3.8.3.2
   */
  static inline int ieee80211_ofdm_chan_to_freq(int s_freq, int channel)
  {
  	if ((channel > 0) && (channel <= 200) &&
  	    (s_freq >= 4000))
  		return s_freq + (channel * 5);
  	else
  		return -1;
  }
  
  /**
   * ieee80211_freq_to_ofdm_channel - get channel
   * @s_freq: starting frequency == (dotChannelStartingFactor/2) MHz
   * @freq: the frequency
   *
   * Convert frequency (MHz) to IEEE802.11 OFDM channel
   * Ref IEEE 802.11-2007 section 17.3.8.3.2
   *
   * This routine selects the channel with the closest center frequency.
   */
  static inline int ieee80211_freq_to_ofdm_chan(int s_freq, int freq)
  {
  	if ((freq > (s_freq + 2)) && (freq <= (s_freq + 1202)) &&
  	    (s_freq >= 4000))
  		return (freq + 2 - s_freq) / 5;
  	else
  		return -1;
  }
  
  /**
   * ieee80211_tu_to_usec - convert time units (TU) to microseconds
   * @tu: the TUs
   */
  static inline unsigned long ieee80211_tu_to_usec(unsigned long tu)
  {
  	return 1024 * tu;
  }
  
  /**
   * ieee80211_check_tim - check if AID bit is set in TIM
   * @tim: the TIM IE
   * @tim_len: length of the TIM IE
   * @aid: the AID to look for
   */
  static inline bool ieee80211_check_tim(struct ieee80211_tim_ie *tim,
  				       u8 tim_len, u16 aid)
  {
  	u8 mask;
  	u8 index, indexn1, indexn2;
  
  	if (unlikely(!tim || tim_len < sizeof(*tim)))
  		return false;
  
  	aid &= 0x3fff;
  	index = aid / 8;
  	mask  = 1 << (aid & 7);
  
  	indexn1 = tim->bitmap_ctrl & 0xfe;
  	indexn2 = tim_len + indexn1 - 4;
  
  	if (index < indexn1 || index > indexn2)
  		return false;
  
  	index -= indexn1;
  
  	return !!(tim->virtual_map[index] & mask);
  }
  
  #endif /* LINUX_IEEE80211_H */
  