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 /*                    The Quest Operating System
  *  Copyright (C) 2005-2010  Richard West, Boston University
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
  *
  *  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.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /* Based on Linux */
 
 /*
  * mac80211 <-> driver interface
  *
  * Copyright 2002-2005, Devicescape Software, Inc.
  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.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 MAC80211_H
 #define MAC80211_H
 
 #include <kernel.h>
 #include <drivers/net/skbuff.h>
 #include <drivers/net/ieee80211.h>
 #include <drivers/net/cfg80211.h>
 
 /**
  * enum nl80211_iftype - (virtual) interface types
  *
  * @NL80211_IFTYPE_UNSPECIFIED: unspecified type, driver decides
  * @NL80211_IFTYPE_ADHOC: independent BSS member
  * @NL80211_IFTYPE_STATION: managed BSS member
  * @NL80211_IFTYPE_AP: access point
  * @NL80211_IFTYPE_AP_VLAN: VLAN interface for access points
  * @NL80211_IFTYPE_WDS: wireless distribution interface
  * @NL80211_IFTYPE_MONITOR: monitor interface receiving all frames
  * @NL80211_IFTYPE_MESH_POINT: mesh point
  * @NL80211_IFTYPE_MAX: highest interface type number currently defined
  * @__NL80211_IFTYPE_AFTER_LAST: internal use
  *
  * These values are used with the %NL80211_ATTR_IFTYPE
  * to set the type of an interface.
  *
  */
 enum nl80211_iftype {
   NL80211_IFTYPE_UNSPECIFIED,
   NL80211_IFTYPE_ADHOC,
   NL80211_IFTYPE_STATION,
   NL80211_IFTYPE_AP,
   NL80211_IFTYPE_AP_VLAN,
   NL80211_IFTYPE_WDS,
   NL80211_IFTYPE_MONITOR,
   NL80211_IFTYPE_MESH_POINT,
 
   /* keep last */
   __NL80211_IFTYPE_AFTER_LAST,
   NL80211_IFTYPE_MAX = __NL80211_IFTYPE_AFTER_LAST - 1
 };
 
 /**
  * enum ieee80211_bss_change - BSS change notification flags
  *
  * These flags are used with the bss_info_changed() callback
  * to indicate which BSS parameter changed.
  *
  * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated),
  *      also implies a change in the AID.
  * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
  * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
  * @BSS_CHANGED_ERP_SLOT: slot timing changed
  * @BSS_CHANGED_HT: 802.11n parameters changed
  * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
  * @BSS_CHANGED_BEACON_INT: Beacon interval changed
  * @BSS_CHANGED_BSSID: BSSID changed, for whatever
  *      reason (IBSS and managed mode)
  * @BSS_CHANGED_BEACON: Beacon data changed, retrieve
  *      new beacon (beaconing modes)
  * @BSS_CHANGED_BEACON_ENABLED: Beaconing should be
  *      enabled/disabled (beaconing modes)
  */
 enum ieee80211_bss_change {
   BSS_CHANGED_ASSOC             = 1<<0,
   BSS_CHANGED_ERP_CTS_PROT      = 1<<1,
   BSS_CHANGED_ERP_PREAMBLE      = 1<<2,
   BSS_CHANGED_ERP_SLOT          = 1<<3,
   BSS_CHANGED_HT                  = 1<<4,
   BSS_CHANGED_BASIC_RATES               = 1<<5,
   BSS_CHANGED_BEACON_INT                = 1<<6,
   BSS_CHANGED_BSSID             = 1<<7,
   BSS_CHANGED_BEACON            = 1<<8,
   BSS_CHANGED_BEACON_ENABLED    = 1<<9,
 };
 
 /**
  * struct ieee80211_bss_conf - holds the BSS's changing parameters
  *
  * This structure keeps information about a BSS (and an association
  * to that BSS) that can change during the lifetime of the BSS.
  *
  * @assoc: association status
  * @aid: association ID number, valid only when @assoc is true
  * @use_cts_prot: use CTS protection
  * @use_short_preamble: use 802.11b short preamble;
  *      if the hardware cannot handle this it must set the
  *      IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
  * @use_short_slot: use short slot time (only relevant for ERP);
  *      if the hardware cannot handle this it must set the
  *      IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
  * @dtim_period: num of beacons before the next DTIM, for PSM
  * @timestamp: beacon timestamp
  * @beacon_int: beacon interval
  * @assoc_capability: capabilities taken from assoc resp
  * @basic_rates: bitmap of basic rates, each bit stands for an
  *      index into the rate table configured by the driver in
  *      the current band.
  * @bssid: The BSSID for this BSS
  * @enable_beacon: whether beaconing should be enabled or not
  * @ht_operation_mode: HT operation mode (like in &struct ieee80211_ht_info).
  *      This field is only valid when the channel type is one of the HT types.
  */
 struct ieee80211_bss_conf {
   const u8 *bssid;
   /* association related data */
   bool assoc;
   u16 aid;
   /* erp related data */
   bool use_cts_prot;
   bool use_short_preamble;
   bool use_short_slot;
   bool enable_beacon;
   u8 dtim_period;
   u16 beacon_int;
   u16 assoc_capability;
   u64 timestamp;
   u32 basic_rates;
   u16 ht_operation_mode;
 };
 
 /**
  * struct ieee80211_vif - per-interface data
  *
  * Data in this structure is continually present for driver
  * use during the life of a virtual interface.
  *
  * @type: type of this virtual interface
  * @bss_conf: BSS configuration for this interface, either our own
  *      or the BSS we're associated to
  * @drv_priv: data area for driver use, will always be aligned to
  *      sizeof(void *).
  */
 struct ieee80211_vif {
   enum nl80211_iftype type;
   struct ieee80211_bss_conf bss_conf;
   /* must be last */
   u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
 };
 
 /**
  * struct ieee80211_if_init_conf - initial configuration of an interface
  *
  * @vif: pointer to a driver-use per-interface structure. The pointer
  *      itself is also used for various functions including
  *      ieee80211_beacon_get() and ieee80211_get_buffered_bc().
  * @type: one of &enum nl80211_iftype constants. Determines the type of
  *      added/removed interface.
  * @mac_addr: pointer to MAC address of the interface. This pointer is valid
  *      until the interface is removed (i.e. it cannot be used after
  *      remove_interface() callback was called for this interface).
  *
  * This structure is used in add_interface() and remove_interface()
  * callbacks of &struct ieee80211_hw.
  *
  * When you allow multiple interfaces to be added to your PHY, take care
  * that the hardware can actually handle multiple MAC addresses. However,
  * also take care that when there's no interface left with mac_addr != %NULL
  * you remove the MAC address from the device to avoid acknowledging packets
  * in pure monitor mode.
  */
 struct ieee80211_if_init_conf {
   enum nl80211_iftype type;
   struct ieee80211_vif *vif;
   void *mac_addr;
 };
 
 /**
  * struct ieee80211_hw - hardware information and state
  *
  * This structure contains the configuration and hardware
  * information for an 802.11 PHY.
  *
  * @wiphy: This points to the &struct wiphy allocated for this
  *      802.11 PHY. You must fill in the @perm_addr and @dev
  *      members of this structure using SET_IEEE80211_DEV()
  *      and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
  *      bands (with channels, bitrates) are registered here.
  *
  * @conf: &struct ieee80211_conf, device configuration, don't use.
  *
  * @priv: pointer to private area that was allocated for driver use
  *      along with this structure.
  *
  * @flags: hardware flags, see &enum ieee80211_hw_flags.
  *
  * @extra_tx_headroom: headroom to reserve in each transmit skb
  *      for use by the driver (e.g. for transmit headers.)
  *
  * @channel_change_time: time (in microseconds) it takes to change channels.
  *
  * @max_signal: Maximum value for signal (rssi) in RX information, used
  *     only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
  *
  * @max_listen_interval: max listen interval in units of beacon interval
  *     that HW supports
  *
  * @queues: number of available hardware transmit queues for
  *      data packets. WMM/QoS requires at least four, these
  *      queues need to have configurable access parameters.
  *
  * @rate_control_algorithm: rate control algorithm for this hardware.
  *      If unset (NULL), the default algorithm will be used. Must be
  *      set before calling ieee80211_register_hw().
  *
  * @vif_data_size: size (in bytes) of the drv_priv data area
  *      within &struct ieee80211_vif.
  * @sta_data_size: size (in bytes) of the drv_priv data area
  *      within &struct ieee80211_sta.
  *
  * @max_rates: maximum number of alternate rate retry stages
  * @max_rate_tries: maximum number of tries for each stage
  */
 struct ieee80211_hw {
   struct ieee80211_conf conf;
   struct wiphy *wiphy;
   const char *rate_control_algorithm;
   void *priv;
   u32 flags;
   unsigned int extra_tx_headroom;
   int channel_change_time;
   int vif_data_size;
   int sta_data_size;
   u16 queues;
   u16 max_listen_interval;
   s8 max_signal;
   u8 max_rates;
   u8 max_rate_tries;
 };
 
 /**
  * struct ieee80211_ops - callbacks from mac80211 to the driver
  *
  * This structure contains various callbacks that the driver may
  * handle or, in some cases, must handle, for example to configure
  * the hardware to a new channel or to transmit a frame.
  *
  * @tx: Handler that 802.11 module calls for each transmitted frame.
  *      skb contains the buffer starting from the IEEE 802.11 header.
  *      The low-level driver should send the frame out based on
  *      configuration in the TX control data. This handler should,
  *      preferably, never fail and stop queues appropriately, more
  *      importantly, however, it must never fail for A-MPDU-queues.
  *      This function should return NETDEV_TX_OK except in very
  *      limited cases.
  *      Must be implemented and atomic.
  *
  * @start: Called before the first netdevice attached to the hardware
  *      is enabled. This should turn on the hardware and must turn on
  *      frame reception (for possibly enabled monitor interfaces.)
  *      Returns negative error codes, these may be seen in userspace,
  *      or zero.
  *      When the device is started it should not have a MAC address
  *      to avoid acknowledging frames before a non-monitor device
  *      is added.
  *      Must be implemented.
  *
  * @stop: Called after last netdevice attached to the hardware
  *      is disabled. This should turn off the hardware (at least
  *      it must turn off frame reception.)
  *      May be called right after add_interface if that rejects
  *      an interface. If you added any work onto the mac80211 workqueue
  *      you should ensure to cancel it on this callback.
  *      Must be implemented.
  *
  * @add_interface: Called when a netdevice attached to the hardware is
  *      enabled. Because it is not called for monitor mode devices, @start
  *      and @stop must be implemented.
  *      The driver should perform any initialization it needs before
  *      the device can be enabled. The initial configuration for the
  *      interface is given in the conf parameter.
  *      The callback may refuse to add an interface by returning a
  *      negative error code (which will be seen in userspace.)
  *      Must be implemented.
  *
  * @remove_interface: Notifies a driver that an interface is going down.
  *      The @stop callback is called after this if it is the last interface
  *      and no monitor interfaces are present.
  *      When all interfaces are removed, the MAC address in the hardware
  *      must be cleared so the device no longer acknowledges packets,
  *      the mac_addr member of the conf structure is, however, set to the
  *      MAC address of the device going away.
  *      Hence, this callback must be implemented.
  *
  * @config: Handler for configuration requests. IEEE 802.11 code calls this
  *      function to change hardware configuration, e.g., channel.
  *      This function should never fail but returns a negative error code
  *      if it does.
  *
  * @bss_info_changed: Handler for configuration requests related to BSS
  *      parameters that may vary during BSS's lifespan, and may affect low
  *      level driver (e.g. assoc/disassoc status, erp parameters).
  *      This function should not be used if no BSS has been set, unless
  *      for association indication. The @changed parameter indicates which
  *      of the bss parameters has changed when a call is made.
  *
  * @prepare_multicast: Prepare for multicast filter configuration.
  *      This callback is optional, and its return value is passed
  *      to configure_filter(). This callback must be atomic.
  *
  * @configure_filter: Configure the device's RX filter.
  *      See the section "Frame filtering" for more information.
  *      This callback must be implemented.
  *
  * @set_tim: Set TIM bit. mac80211 calls this function when a TIM bit
  *      must be set or cleared for a given STA. Must be atomic.
  *
  * @set_key: See the section "Hardware crypto acceleration"
  *      This callback can sleep, and is only called between add_interface
  *      and remove_interface calls, i.e. while the given virtual interface
  *      is enabled.
  *      Returns a negative error code if the key can't be added.
  *
  * @update_tkip_key: See the section "Hardware crypto acceleration"
  *      This callback will be called in the context of Rx. Called for drivers
  *      which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY.
  *
  * @hw_scan: Ask the hardware to service the scan request, no need to start
  *      the scan state machine in stack. The scan must honour the channel
  *      configuration done by the regulatory agent in the wiphy's
  *      registered bands. The hardware (or the driver) needs to make sure
  *      that power save is disabled.
  *      The @req ie/ie_len members are rewritten by mac80211 to contain the
  *      entire IEs after the SSID, so that drivers need not look at these
  *      at all but just send them after the SSID -- mac80211 includes the
  *      (extended) supported rates and HT information (where applicable).
  *      When the scan finishes, ieee80211_scan_completed() must be called;
  *      note that it also must be called when the scan cannot finish due to
  *      any error unless this callback returned a negative error code.
  *
  * @sw_scan_start: Notifier function that is called just before a software scan
  *      is started. Can be NULL, if the driver doesn't need this notification.
  *
  * @sw_scan_complete: Notifier function that is called just after a software scan
  *      finished. Can be NULL, if the driver doesn't need this notification.
  *
  * @get_stats: Return low-level statistics.
  *      Returns zero if statistics are available.
  *
  * @get_tkip_seq: If your device implements TKIP encryption in hardware this
  *      callback should be provided to read the TKIP transmit IVs (both IV32
  *      and IV16) for the given key from hardware.
  *
  * @set_rts_threshold: Configuration of RTS threshold (if device needs it)
  *
  * @sta_notify: Notifies low level driver about addition, removal or power
  *      state transition of an associated station, AP,  IBSS/WDS/mesh peer etc.
  *      Must be atomic.
  *
  * @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
  *      bursting) for a hardware TX queue.
  *      Returns a negative error code on failure.
  *
  * @get_tx_stats: Get statistics of the current TX queue status. This is used
  *      to get number of currently queued packets (queue length), maximum queue
  *      size (limit), and total number of packets sent using each TX queue
  *      (count). The 'stats' pointer points to an array that has hw->queues
  *      items.
  *
  * @get_tsf: Get the current TSF timer value from firmware/hardware. Currently,
  *      this is only used for IBSS mode BSSID merging and debugging. Is not a
  *      required function.
  *
  * @set_tsf: Set the TSF timer to the specified value in the firmware/hardware.
  *      Currently, this is only used for IBSS mode debugging. Is not a
  *      required function.
  *
  * @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize
  *      with other STAs in the IBSS. This is only used in IBSS mode. This
  *      function is optional if the firmware/hardware takes full care of
  *      TSF synchronization.
  *
  * @tx_last_beacon: Determine whether the last IBSS beacon was sent by us.
  *      This is needed only for IBSS mode and the result of this function is
  *      used to determine whether to reply to Probe Requests.
  *      Returns non-zero if this device sent the last beacon.
  *
  * @ampdu_action: Perform a certain A-MPDU action
  *      The RA/TID combination determines the destination and TID we want
  *      the ampdu action to be performed for. The action is defined through
  *      ieee80211_ampdu_mlme_action. Starting sequence number (@ssn)
  *      is the first frame we expect to perform the action on. Notice
  *      that TX/RX_STOP can pass NULL for this parameter.
  *      Returns a negative error code on failure.
  *
  * @rfkill_poll: Poll rfkill hardware state. If you need this, you also
  *      need to set wiphy->rfkill_poll to %true before registration,
  *      and need to call wiphy_rfkill_set_hw_state() in the callback.
  *
  * @testmode_cmd: Implement a cfg80211 test mode command.
  */
 struct ieee80211_ops {
   bool (*start)(struct ieee80211_hw *hw);
   void (*stop)(struct ieee80211_hw *hw);
   int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
   bool (*config)(struct ieee80211_hw *hw, u32 changed);
   bool (*add_interface)(struct ieee80211_hw *hw,
                         struct ieee80211_if_init_conf *conf);
   void (*remove_interface)(struct ieee80211_hw *hw,
                            struct ieee80211_if_init_conf *conf);
   void (*bss_info_changed)(struct ieee80211_hw *hw,
                            struct ieee80211_vif *vif,
                            struct ieee80211_bss_conf *info,
                            u32 changed);
   bool (*conf_tx)(struct ieee80211_hw *hw, u16 queue,
                   const struct ieee80211_tx_queue_params *params);
 #if 0
   u64 (*prepare_multicast)(struct ieee80211_hw *hw,
                            int mc_count, struct dev_addr_list *mc_list);
   void (*configure_filter)(struct ieee80211_hw *hw,
                            unsigned int changed_flags,
                            unsigned int *total_flags,
                            u64 multicast);
   int (*set_tim)(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
                  bool set);
   int (*set_key)(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                  struct ieee80211_vif *vif, struct ieee80211_sta *sta,
                  struct ieee80211_key_conf *key);
   void (*update_tkip_key)(struct ieee80211_hw *hw,
                           struct ieee80211_key_conf *conf, const u8 *address,
                           u32 iv32, u16 *phase1key);
   int (*hw_scan)(struct ieee80211_hw *hw,
                  struct cfg80211_scan_request *req);
   void (*sw_scan_start)(struct ieee80211_hw *hw);
   void (*sw_scan_complete)(struct ieee80211_hw *hw);
   int (*get_stats)(struct ieee80211_hw *hw,
                    struct ieee80211_low_level_stats *stats);
   void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
                        u32 *iv32, u16 *iv16);
   int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
   void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                      enum sta_notify_cmd, struct ieee80211_sta *sta);
   int (*get_tx_stats)(struct ieee80211_hw *hw,
                       struct ieee80211_tx_queue_stats *stats);
   u64 (*get_tsf)(struct ieee80211_hw *hw);
   void (*set_tsf)(struct ieee80211_hw *hw, u64 tsf);
   void (*reset_tsf)(struct ieee80211_hw *hw);
   int (*tx_last_beacon)(struct ieee80211_hw *hw);
   int (*ampdu_action)(struct ieee80211_hw *hw,
                       enum ieee80211_ampdu_mlme_action action,
                       struct ieee80211_sta *sta, u16 tid, u16 *ssn);
 
   void (*rfkill_poll)(struct ieee80211_hw *hw);
 #ifdef CONFIG_NL80211_TESTMODE
   int (*testmode_cmd)(struct ieee80211_hw *hw, void *data, int len);
 #endif
 #endif
 };
 
 /**
  * ieee80211_alloc_hw -  Allocate a new hardware device
  *
  * This must be called once for each hardware device. The returned pointer
  * must be used to refer to this device when calling other functions.
  * mac80211 allocates a private data area for the driver pointed to by
  * @priv in &struct ieee80211_hw, the size of this area is given as
  * @priv_data_len.
  *
  * @priv_data_len: length of private data
  * @ops: callbacks for this device
  */
 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
                                         const struct ieee80211_ops *ops);
 
 /**
  * ieee80211_register_hw - Register hardware device
  *
  * You must call this function before any other functions in
  * mac80211. Note that before a hardware can be registered, you
  * need to fill the contained wiphy's information.
  *
  * @hw: the device to register as returned by ieee80211_alloc_hw()
  */
 bool ieee80211_register_hw(struct ieee80211_hw *hw);
 
 
 #if 0
 
 /**
  * DOC: Introduction
  *
  * mac80211 is the Linux stack for 802.11 hardware that implements
  * only partial functionality in hard- or firmware. This document
  * defines the interface between mac80211 and low-level hardware
  * drivers.
  */
 
 /**
  * DOC: Calling mac80211 from interrupts
  *
  * Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
  * called in hardware interrupt context. The low-level driver must not call any
  * other functions in hardware interrupt context. If there is a need for such
  * call, the low-level driver should first ACK the interrupt and perform the
  * IEEE 802.11 code call after this, e.g. from a scheduled workqueue or even
  * tasklet function.
  *
  * NOTE: If the driver opts to use the _irqsafe() functions, it may not also
  *       use the non-IRQ-safe functions!
  */
 
 /**
  * DOC: Warning
  *
  * If you're reading this document and not the header file itself, it will
  * be incomplete because not all documentation has been converted yet.
  */
 
 /**
  * DOC: Frame format
  *
  * As a general rule, when frames are passed between mac80211 and the driver,
  * they start with the IEEE 802.11 header and include the same octets that are
  * sent over the air except for the FCS which should be calculated by the
  * hardware.
  *
  * There are, however, various exceptions to this rule for advanced features:
  *
  * The first exception is for hardware encryption and decryption offload
  * where the IV/ICV may or may not be generated in hardware.
  *
  * Secondly, when the hardware handles fragmentation, the frame handed to
  * the driver from mac80211 is the MSDU, not the MPDU.
  *
  * Finally, for received frames, the driver is able to indicate that it has
  * filled a radiotap header and put that in front of the frame; if it does
  * not do so then mac80211 may add this under certain circumstances.
  */
 
 /**
  * DOC: mac80211 workqueue
  *
  * mac80211 provides its own workqueue for drivers and internal mac80211 use.
  * The workqueue is a single threaded workqueue and can only be accessed by
  * helpers for sanity checking. Drivers must ensure all work added onto the
  * mac80211 workqueue should be cancelled on the driver stop() callback.
  *
  * mac80211 will flushed the workqueue upon interface removal and during
  * suspend.
  *
  * All work performed on the mac80211 workqueue must not acquire the RTNL lock.
  *
  */
 
 /**
  * enum ieee80211_max_queues - maximum number of queues
  *
  * @IEEE80211_MAX_QUEUES: Maximum number of regular device queues.
  */
 enum ieee80211_max_queues {
   IEEE80211_MAX_QUEUES =          4,
 };
 
 /**
  * struct ieee80211_tx_queue_params - transmit queue configuration
  *
  * The information provided in this structure is required for QoS
  * transmit queue configuration. Cf. IEEE 802.11 7.3.2.29.
  *
  * @aifs: arbitration interframe space [0..255]
  * @cw_min: minimum contention window [a value of the form
  *      2^n-1 in the range 1..32767]
  * @cw_max: maximum contention window [like @cw_min]
  * @txop: maximum burst time in units of 32 usecs, 0 meaning disabled
  */
 struct ieee80211_tx_queue_params {
   u16 txop;
   u16 cw_min;
   u16 cw_max;
   u8 aifs;
 };
 
 /**
  * struct ieee80211_tx_queue_stats - transmit queue statistics
  *
  * @len: number of packets in queue
  * @limit: queue length limit
  * @count: number of frames sent
  */
 struct ieee80211_tx_queue_stats {
   unsigned int len;
   unsigned int limit;
   unsigned int count;
 };
 
 struct ieee80211_low_level_stats {
   unsigned int dot11ACKFailureCount;
   unsigned int dot11RTSFailureCount;
   unsigned int dot11FCSErrorCount;
   unsigned int dot11RTSSuccessCount;
 };
 
 /**
  * enum ieee80211_bss_change - BSS change notification flags
  *
  * These flags are used with the bss_info_changed() callback
  * to indicate which BSS parameter changed.
  *
  * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated),
  *      also implies a change in the AID.
  * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
  * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
  * @BSS_CHANGED_ERP_SLOT: slot timing changed
  * @BSS_CHANGED_HT: 802.11n parameters changed
  * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
  * @BSS_CHANGED_BEACON_INT: Beacon interval changed
  * @BSS_CHANGED_BSSID: BSSID changed, for whatever
  *      reason (IBSS and managed mode)
  * @BSS_CHANGED_BEACON: Beacon data changed, retrieve
  *      new beacon (beaconing modes)
  * @BSS_CHANGED_BEACON_ENABLED: Beaconing should be
  *      enabled/disabled (beaconing modes)
  */
 enum ieee80211_bss_change {
   BSS_CHANGED_ASSOC               = 1<<0,
   BSS_CHANGED_ERP_CTS_PROT        = 1<<1,
   BSS_CHANGED_ERP_PREAMBLE        = 1<<2,
   BSS_CHANGED_ERP_SLOT            = 1<<3,
   BSS_CHANGED_HT                  = 1<<4,
   BSS_CHANGED_BASIC_RATES         = 1<<5,
   BSS_CHANGED_BEACON_INT          = 1<<6,
   BSS_CHANGED_BSSID               = 1<<7,
   BSS_CHANGED_BEACON              = 1<<8,
   BSS_CHANGED_BEACON_ENABLED      = 1<<9,
 };
 
 /**
  * struct ieee80211_bss_conf - holds the BSS's changing parameters
  *
  * This structure keeps information about a BSS (and an association
  * to that BSS) that can change during the lifetime of the BSS.
  *
  * @assoc: association status
  * @aid: association ID number, valid only when @assoc is true
  * @use_cts_prot: use CTS protection
  * @use_short_preamble: use 802.11b short preamble;
  *      if the hardware cannot handle this it must set the
  *      IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
  * @use_short_slot: use short slot time (only relevant for ERP);
  *      if the hardware cannot handle this it must set the
  *      IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
  * @dtim_period: num of beacons before the next DTIM, for PSM
  * @timestamp: beacon timestamp
  * @beacon_int: beacon interval
  * @assoc_capability: capabilities taken from assoc resp
  * @basic_rates: bitmap of basic rates, each bit stands for an
  *      index into the rate table configured by the driver in
  *      the current band.
  * @bssid: The BSSID for this BSS
  * @enable_beacon: whether beaconing should be enabled or not
  * @ht_operation_mode: HT operation mode (like in &struct ieee80211_ht_info).
  *      This field is only valid when the channel type is one of the HT types.
  */
 struct ieee80211_bss_conf {
   const u8 *bssid;
   /* association related data */
   bool assoc;
   u16 aid;
   /* erp related data */
   bool use_cts_prot;
   bool use_short_preamble;
   bool use_short_slot;
   bool enable_beacon;
   u8 dtim_period;
   u16 beacon_int;
   u16 assoc_capability;
   u64 timestamp;
   u32 basic_rates;
   u16 ht_operation_mode;
 };
 
 /**
  * enum mac80211_tx_control_flags - flags to describe transmission information/status
  *
  * These flags are used with the @flags member of &ieee80211_tx_info.
  *
  * @IEEE80211_TX_CTL_REQ_TX_STATUS: request TX status callback for this frame.
  * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
  *      number to this frame, taking care of not overwriting the fragment
  *      number and increasing the sequence number only when the
  *      IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly
  *      assign sequence numbers to QoS-data frames but cannot do so correctly
  *      for non-QoS-data and management frames because beacons need them from
  *      that counter as well and mac80211 cannot guarantee proper sequencing.
  *      If this flag is set, the driver should instruct the hardware to
  *      assign a sequence number to the frame or assign one itself. Cf. IEEE
  *      802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
  *      beacons and always be clear for frames without a sequence number field.
  * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack
  * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination
  *      station
  * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame
  * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon
  * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU
  * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.
  * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted
  *      because the destination STA was in powersave mode. Note that to
  *      avoid race conditions, the filter must be set by the hardware or
  *      firmware upon receiving a frame that indicates that the station
  *      went to sleep (must be done on device to filter frames already on
  *      the queue) and may only be unset after mac80211 gives the OK for
  *      that by setting the IEEE80211_TX_CTL_CLEAR_PS_FILT (see above),
  *      since only then is it guaranteed that no more frames are in the
  *      hardware queue.
  * @IEEE80211_TX_STAT_ACK: Frame was acknowledged
  * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status
  *      is for the whole aggregation.
  * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned,
  *      so consider using block ack request (BAR).
  * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
  *      set by rate control algorithms to indicate probe rate, will
  *      be cleared for fragmented frames (except on the last fragment)
  * @IEEE80211_TX_INTFL_RCALGO: mac80211 internal flag, do not test or
  *      set this flag in the driver; indicates that the rate control
  *      algorithm was used and should be notified of TX status
  * @IEEE80211_TX_INTFL_NEED_TXPROCESSING: completely internal to mac80211,
  *      used to indicate that a pending frame requires TX processing before
  *      it can be sent out.
  * @IEEE80211_TX_INTFL_RETRIED: completely internal to mac80211,
  *      used to indicate that a frame was already retried due to PS
  * @IEEE80211_TX_INTFL_DONT_ENCRYPT: completely internal to mac80211,
  *      used to indicate frame should not be encrypted
  * @IEEE80211_TX_CTL_PSPOLL_RESPONSE: (internal?)
  *      This frame is a response to a PS-poll frame and should be sent
  *      although the station is in powersave mode.
  * @IEEE80211_TX_CTL_MORE_FRAMES: More frames will be passed to the
  *      transmit function after the current frame, this can be used
  *      by drivers to kick the DMA queue only if unset or when the
  *      queue gets full.
  */
 enum mac80211_tx_control_flags {
   IEEE80211_TX_CTL_REQ_TX_STATUS          = BIT(0),
   IEEE80211_TX_CTL_ASSIGN_SEQ             = BIT(1),
   IEEE80211_TX_CTL_NO_ACK                 = BIT(2),
   IEEE80211_TX_CTL_CLEAR_PS_FILT          = BIT(3),
   IEEE80211_TX_CTL_FIRST_FRAGMENT         = BIT(4),
   IEEE80211_TX_CTL_SEND_AFTER_DTIM        = BIT(5),
   IEEE80211_TX_CTL_AMPDU                  = BIT(6),
   IEEE80211_TX_CTL_INJECTED               = BIT(7),
   IEEE80211_TX_STAT_TX_FILTERED           = BIT(8),
   IEEE80211_TX_STAT_ACK                   = BIT(9),
   IEEE80211_TX_STAT_AMPDU                 = BIT(10),
   IEEE80211_TX_STAT_AMPDU_NO_BACK         = BIT(11),
   IEEE80211_TX_CTL_RATE_CTRL_PROBE        = BIT(12),
   IEEE80211_TX_INTFL_RCALGO               = BIT(13),
   IEEE80211_TX_INTFL_NEED_TXPROCESSING    = BIT(14),
   IEEE80211_TX_INTFL_RETRIED              = BIT(15),
   IEEE80211_TX_INTFL_DONT_ENCRYPT         = BIT(16),
   IEEE80211_TX_CTL_PSPOLL_RESPONSE        = BIT(17),
   IEEE80211_TX_CTL_MORE_FRAMES            = BIT(18),
 };
 
 /**
  * enum mac80211_rate_control_flags - per-rate flags set by the
  *      Rate Control algorithm.
  *
  * These flags are set by the Rate control algorithm for each rate during tx,
  * in the @flags member of struct ieee80211_tx_rate.
  *
  * @IEEE80211_TX_RC_USE_RTS_CTS: Use RTS/CTS exchange for this rate.
  * @IEEE80211_TX_RC_USE_CTS_PROTECT: CTS-to-self protection is required.
  *      This is set if the current BSS requires ERP protection.
  * @IEEE80211_TX_RC_USE_SHORT_PREAMBLE: Use short preamble.
  * @IEEE80211_TX_RC_MCS: HT rate.
  * @IEEE80211_TX_RC_GREEN_FIELD: Indicates whether this rate should be used in
  *      Greenfield mode.
  * @IEEE80211_TX_RC_40_MHZ_WIDTH: Indicates if the Channel Width should be 40 MHz.
  * @IEEE80211_TX_RC_DUP_DATA: The frame should be transmitted on both of the
  *      adjacent 20 MHz channels, if the current channel type is
  *      NL80211_CHAN_HT40MINUS or NL80211_CHAN_HT40PLUS.
  * @IEEE80211_TX_RC_SHORT_GI: Short Guard interval should be used for this rate.
  */
 enum mac80211_rate_control_flags {
   IEEE80211_TX_RC_USE_RTS_CTS             = BIT(0),
   IEEE80211_TX_RC_USE_CTS_PROTECT         = BIT(1),
   IEEE80211_TX_RC_USE_SHORT_PREAMBLE      = BIT(2),
 
   /* rate index is an MCS rate number instead of an index */
   IEEE80211_TX_RC_MCS                     = BIT(3),
   IEEE80211_TX_RC_GREEN_FIELD             = BIT(4),
   IEEE80211_TX_RC_40_MHZ_WIDTH            = BIT(5),
   IEEE80211_TX_RC_DUP_DATA                = BIT(6),
   IEEE80211_TX_RC_SHORT_GI                = BIT(7),
 };
 
 
 /* there are 40 bytes if you don't need the rateset to be kept */
 #define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40
 
 /* if you do need the rateset, then you have less space */
 #define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
 
 /* maximum number of rate stages */
 #define IEEE80211_TX_MAX_RATES  5
 
 /**
  * struct ieee80211_tx_rate - rate selection/status
  *
  * @idx: rate index to attempt to send with
  * @flags: rate control flags (&enum mac80211_rate_control_flags)
  * @count: number of tries in this rate before going to the next rate
  *
  * A value of -1 for @idx indicates an invalid rate and, if used
  * in an array of retry rates, that no more rates should be tried.
  *
  * When used for transmit status reporting, the driver should
  * always report the rate along with the flags it used.
  *
  * &struct ieee80211_tx_info contains an array of these structs
  * in the control information, and it will be filled by the rate
  * control algorithm according to what should be sent. For example,
  * if this array contains, in the format { <idx>, <count> } the
  * information
  *    { 3, 2 }, { 2, 2 }, { 1, 4 }, { -1, 0 }, { -1, 0 }
  * then this means that the frame should be transmitted
  * up to twice at rate 3, up to twice at rate 2, and up to four
  * times at rate 1 if it doesn't get acknowledged. Say it gets
  * acknowledged by the peer after the fifth attempt, the status
  * information should then contain
  *   { 3, 2 }, { 2, 2 }, { 1, 1 }, { -1, 0 } ...
  * since it was transmitted twice at rate 3, twice at rate 2
  * and once at rate 1 after which we received an acknowledgement.
  */
 struct ieee80211_tx_rate {
   s8 idx;
   u8 count;
   u8 flags;
 } __attribute__((packed));
 
 /**
  * struct ieee80211_tx_info - skb transmit information
  *
  * This structure is placed in skb->cb for three uses:
  *  (1) mac80211 TX control - mac80211 tells the driver what to do
  *  (2) driver internal use (if applicable)
  *  (3) TX status information - driver tells mac80211 what happened
  *
  * The TX control's sta pointer is only valid during the ->tx call,
  * it may be NULL.
  *
  * @flags: transmit info flags, defined above
  * @band: the band to transmit on (use for checking for races)
  * @antenna_sel_tx: antenna to use, 0 for automatic diversity
  * @pad: padding, ignore
  * @control: union for control data
  * @status: union for status data
  * @driver_data: array of driver_data pointers
  * @ampdu_ack_len: number of aggregated frames.
  *      relevant only if IEEE80211_TX_STATUS_AMPDU was set.
  * @ampdu_ack_map: block ack bit map for the aggregation.
  *      relevant only if IEEE80211_TX_STATUS_AMPDU was set.
  * @ack_signal: signal strength of the ACK frame
  */
 struct ieee80211_tx_info {
   /* common information */
   u32 flags;
   u8 band;
 
   u8 antenna_sel_tx;
 
   /* 2 byte hole */
   u8 pad[2];
 
   union {
     struct {
       union {
         /* rate control */
         struct {
           struct ieee80211_tx_rate rates[
                                          IEEE80211_TX_MAX_RATES];
           s8 rts_cts_rate_idx;
         };
         /* only needed before rate control */
         unsigned long jiffies;
       };
       /* NB: vif can be NULL for injected frames */
       struct ieee80211_vif *vif;
       struct ieee80211_key_conf *hw_key;
       struct ieee80211_sta *sta;
     } control;
     struct {
       struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
       u8 ampdu_ack_len;
       u64 ampdu_ack_map;
       int ack_signal;
       /* 8 bytes free */
     } status;
     struct {
       struct ieee80211_tx_rate driver_rates[
                                             IEEE80211_TX_MAX_RATES];
       void *rate_driver_data[
                              IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)];
     };
     void *driver_data[
                       IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)];
   };
 };
 
 static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
 {
   return (struct ieee80211_tx_info *)skb->cb;
 }
 
 static inline struct ieee80211_rx_status *IEEE80211_SKB_RXCB(struct sk_buff *skb)
 {
   return (struct ieee80211_rx_status *)skb->cb;
 }
 
 /**
  * ieee80211_tx_info_clear_status - clear TX status
  *
  * @info: The &struct ieee80211_tx_info to be cleared.
  *
  * When the driver passes an skb back to mac80211, it must report
  * a number of things in TX status. This function clears everything
  * in the TX status but the rate control information (it does clear
  * the count since you need to fill that in anyway).
  *
  * NOTE: You can only use this function if you do NOT use
  *       info->driver_data! Use info->rate_driver_data
  *       instead if you need only the less space that allows.
  */
 static inline void
 ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
 {
   int i;
 
   BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
                offsetof(struct ieee80211_tx_info, control.rates));
   BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
                offsetof(struct ieee80211_tx_info, driver_rates));
   BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8);
   /* clear the rate counts */
   for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
     info->status.rates[i].count = 0;
 
   BUILD_BUG_ON(
                offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
   memset(&info->status.ampdu_ack_len, 0,
          sizeof(struct ieee80211_tx_info) -
          offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
 }
 
 
 /**
  * enum mac80211_rx_flags - receive flags
  *
  * These flags are used with the @flag member of &struct ieee80211_rx_status.
  * @RX_FLAG_MMIC_ERROR: Michael MIC error was reported on this frame.
  *      Use together with %RX_FLAG_MMIC_STRIPPED.
  * @RX_FLAG_DECRYPTED: This frame was decrypted in hardware.
  * @RX_FLAG_RADIOTAP: This frame starts with a radiotap header.
  * @RX_FLAG_MMIC_STRIPPED: the Michael MIC is stripped off this frame,
  *      verification has been done by the hardware.
  * @RX_FLAG_IV_STRIPPED: The IV/ICV are stripped from this frame.
  *      If this flag is set, the stack cannot do any replay detection
  *      hence the driver or hardware will have to do that.
  * @RX_FLAG_FAILED_FCS_CRC: Set this flag if the FCS check failed on
  *      the frame.
  * @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
  *      the frame.
  * @RX_FLAG_TSFT: The timestamp passed in the RX status (@mactime field)
  *      is valid. This is useful in monitor mode and necessary for beacon frames
  *      to enable IBSS merging.
  * @RX_FLAG_SHORTPRE: Short preamble was used for this frame
  * @RX_FLAG_HT: HT MCS was used and rate_idx is MCS index
  * @RX_FLAG_40MHZ: HT40 (40 MHz) was used
  * @RX_FLAG_SHORT_GI: Short guard interval was used
  */
 enum mac80211_rx_flags {
   RX_FLAG_MMIC_ERROR      = 1<<0,
   RX_FLAG_DECRYPTED       = 1<<1,
   RX_FLAG_RADIOTAP        = 1<<2,
   RX_FLAG_MMIC_STRIPPED   = 1<<3,
   RX_FLAG_IV_STRIPPED     = 1<<4,
   RX_FLAG_FAILED_FCS_CRC  = 1<<5,
   RX_FLAG_FAILED_PLCP_CRC = 1<<6,
   RX_FLAG_TSFT            = 1<<7,
   RX_FLAG_SHORTPRE        = 1<<8,
   RX_FLAG_HT              = 1<<9,
   RX_FLAG_40MHZ           = 1<<10,
   RX_FLAG_SHORT_GI        = 1<<11,
 };
 
 /**
  * struct ieee80211_rx_status - receive status
  *
  * The low-level driver should provide this information (the subset
  * supported by hardware) to the 802.11 code with each received
  * frame, in the skb's control buffer (cb).
  *
  * @mactime: value in microseconds of the 64-bit Time Synchronization Function
  *      (TSF) timer when the first data symbol (MPDU) arrived at the hardware.
  * @band: the active band when this frame was received
  * @freq: frequency the radio was tuned to when receiving this frame, in MHz
  * @signal: signal strength when receiving this frame, either in dBm, in dB or
  *      unspecified depending on the hardware capabilities flags
  *      @IEEE80211_HW_SIGNAL_*
  * @noise: noise when receiving this frame, in dBm.
  * @qual: overall signal quality indication, in percent (0-100).
  * @antenna: antenna used
  * @rate_idx: index of data rate into band's supported rates or MCS index if
  *      HT rates are use (RX_FLAG_HT)
  * @flag: %RX_FLAG_*
  */
 struct ieee80211_rx_status {
   u64 mactime;
   enum ieee80211_band band;
   int freq;
   int signal;
   int noise;
   int qual;
   int antenna;
   int rate_idx;
   int flag;
 };
 
 /**
  * enum ieee80211_conf_flags - configuration flags
  *
  * Flags to define PHY configuration options
  *
  * @IEEE80211_CONF_RADIOTAP: add radiotap header at receive time (if supported)
  * @IEEE80211_CONF_PS: Enable 802.11 power save mode (managed mode only)
  * @IEEE80211_CONF_IDLE: The device is running, but idle; if the flag is set
  *      the driver should be prepared to handle configuration requests but
  *      may turn the device off as much as possible. Typically, this flag will
  *      be set when an interface is set UP but not associated or scanning, but
  *      it can also be unset in that case when monitor interfaces are active.
  */
 enum ieee80211_conf_flags {
   IEEE80211_CONF_RADIOTAP         = (1<<0),
   IEEE80211_CONF_PS               = (1<<1),
   IEEE80211_CONF_IDLE             = (1<<2),
 };
 
 
 /**
  * enum ieee80211_conf_changed - denotes which configuration changed
  *
  * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
  * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed
  * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed
  * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
  * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed
  * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed
  * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed
  */
 enum ieee80211_conf_changed {
   IEEE80211_CONF_CHANGE_LISTEN_INTERVAL   = BIT(2),
   IEEE80211_CONF_CHANGE_RADIOTAP          = BIT(3),
   IEEE80211_CONF_CHANGE_PS                = BIT(4),
   IEEE80211_CONF_CHANGE_POWER             = BIT(5),
   IEEE80211_CONF_CHANGE_CHANNEL           = BIT(6),
   IEEE80211_CONF_CHANGE_RETRY_LIMITS      = BIT(7),
   IEEE80211_CONF_CHANGE_IDLE              = BIT(8),
 };
 
 /**
  * struct ieee80211_conf - configuration of the device
  *
  * This struct indicates how the driver shall configure the hardware.
  *
  * @flags: configuration flags defined above
  *
  * @listen_interval: listen interval in units of beacon interval
  * @max_sleep_period: the maximum number of beacon intervals to sleep for
  *      before checking the beacon for a TIM bit (managed mode only); this
  *      value will be only achievable between DTIM frames, the hardware
  *      needs to check for the multicast traffic bit in DTIM beacons.
  *      This variable is valid only when the CONF_PS flag is set.
  * @dynamic_ps_timeout: The dynamic powersave timeout (in ms), see the
  *      powersave documentation below. This variable is valid only when
  *      the CONF_PS flag is set.
  *
  * @power_level: requested transmit power (in dBm)
  *
  * @channel: the channel to tune to
  * @channel_type: the channel (HT) type
  *
  * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame
  *    (a frame not RTS protected), called "dot11LongRetryLimit" in 802.11,
  *    but actually means the number of transmissions not the number of retries
  * @short_frame_max_tx_count: Maximum number of transmissions for a "short"
  *    frame, called "dot11ShortRetryLimit" in 802.11, but actually means the
  *    number of transmissions not the number of retries
  */
 struct ieee80211_conf {
   u32 flags;
   int power_level, dynamic_ps_timeout;
   int max_sleep_period;
 
   u16 listen_interval;
 
   u8 long_frame_max_tx_count, short_frame_max_tx_count;
 
   struct ieee80211_channel *channel;
   enum nl80211_channel_type channel_type;
 };
 
 /**
  * struct ieee80211_vif - per-interface data
  *
  * Data in this structure is continually present for driver
  * use during the life of a virtual interface.
  *
  * @type: type of this virtual interface
  * @bss_conf: BSS configuration for this interface, either our own
  *      or the BSS we're associated to
  * @drv_priv: data area for driver use, will always be aligned to
  *      sizeof(void *).
  */
 struct ieee80211_vif {
   enum nl80211_iftype type;
   struct ieee80211_bss_conf bss_conf;
   /* must be last */
   u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
 };
 
 static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif)
 {
 #ifdef CONFIG_MAC80211_MESH
   return vif->type == NL80211_IFTYPE_MESH_POINT;
 #endif
   return false;
 }
 
 /**
  * enum ieee80211_key_alg - key algorithm
  * @ALG_WEP: WEP40 or WEP104
  * @ALG_TKIP: TKIP
  * @ALG_CCMP: CCMP (AES)
  * @ALG_AES_CMAC: AES-128-CMAC
  */
 enum ieee80211_key_alg {
   ALG_WEP,
   ALG_TKIP,
   ALG_CCMP,
   ALG_AES_CMAC,
 };
 
 /**
  * enum ieee80211_key_flags - key flags
  *
  * These flags are used for communication about keys between the driver
  * and mac80211, with the @flags parameter of &struct ieee80211_key_conf.
  *
  * @IEEE80211_KEY_FLAG_WMM_STA: Set by mac80211, this flag indicates
  *      that the STA this key will be used with could be using QoS.
  * @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the
  *      driver to indicate that it requires IV generation for this
  *      particular key.
  * @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by
  *      the driver for a TKIP key if it requires Michael MIC
  *      generation in software.
  * @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates
  *      that the key is pairwise rather then a shared key.
  * @IEEE80211_KEY_FLAG_SW_MGMT: This flag should be set by the driver for a
  *      CCMP key if it requires CCMP encryption of management frames (MFP) to
  *      be done in software.
  */
 enum ieee80211_key_flags {
   IEEE80211_KEY_FLAG_WMM_STA      = 1<<0,
   IEEE80211_KEY_FLAG_GENERATE_IV  = 1<<1,
   IEEE80211_KEY_FLAG_GENERATE_MMIC= 1<<2,
   IEEE80211_KEY_FLAG_PAIRWISE     = 1<<3,
   IEEE80211_KEY_FLAG_SW_MGMT      = 1<<4,
 };
 
 /**
  * struct ieee80211_key_conf - key information
  *
  * This key information is given by mac80211 to the driver by
  * the set_key() callback in &struct ieee80211_ops.
  *
  * @hw_key_idx: To be set by the driver, this is the key index the driver
  *      wants to be given when a frame is transmitted and needs to be
  *      encrypted in hardware.
  * @alg: The key algorithm.
  * @flags: key flags, see &enum ieee80211_key_flags.
  * @keyidx: the key index (0-3)
  * @keylen: key material length
  * @key: key material. For ALG_TKIP the key is encoded as a 256-bit (32 byte)
  *      data block:
  *      - Temporal Encryption Key (128 bits)
  *      - Temporal Authenticator Tx MIC Key (64 bits)
  *      - Temporal Authenticator Rx MIC Key (64 bits)
  * @icv_len: The ICV length for this key type
  * @iv_len: The IV length for this key type
  */
 struct ieee80211_key_conf {
   enum ieee80211_key_alg alg;
   u8 icv_len;
   u8 iv_len;
   u8 hw_key_idx;
   u8 flags;
   s8 keyidx;
   u8 keylen;
   u8 key[0];
 };
 
 /**
  * enum set_key_cmd - key command
  *
  * Used with the set_key() callback in &struct ieee80211_ops, this
  * indicates whether a key is being removed or added.
  *
  * @SET_KEY: a key is set
  * @DISABLE_KEY: a key must be disabled
  */
 enum set_key_cmd {
   SET_KEY, DISABLE_KEY,
 };
 
 /**
  * struct ieee80211_sta - station table entry
  *
  * A station table entry represents a station we are possibly
  * communicating with. Since stations are RCU-managed in
  * mac80211, any ieee80211_sta pointer you get access to must
  * either be protected by rcu_read_lock() explicitly or implicitly,
  * or you must take good care to not use such a pointer after a
  * call to your sta_notify callback that removed it.
  *
  * @addr: MAC address
  * @aid: AID we assigned to the station if we're an AP
  * @supp_rates: Bitmap of supported rates (per band)
  * @ht_cap: HT capabilities of this STA; restricted to our own TX capabilities
  * @drv_priv: data area for driver use, will always be aligned to
  *      sizeof(void *), size is determined in hw information.
  */
 struct ieee80211_sta {
   u32 supp_rates[IEEE80211_NUM_BANDS];
   u8 addr[ETH_ALEN];
   u16 aid;
   struct ieee80211_sta_ht_cap ht_cap;
 
   /* must be last */
   u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
 };
 
 /**
  * enum sta_notify_cmd - sta notify command
  *
  * Used with the sta_notify() callback in &struct ieee80211_ops, this
  * indicates addition and removal of a station to station table,
  * or if a associated station made a power state transition.
  *
  * @STA_NOTIFY_ADD: a station was added to the station table
  * @STA_NOTIFY_REMOVE: a station being removed from the station table
  * @STA_NOTIFY_SLEEP: a station is now sleeping
  * @STA_NOTIFY_AWAKE: a sleeping station woke up
  */
 enum sta_notify_cmd {
   STA_NOTIFY_ADD, STA_NOTIFY_REMOVE,
   STA_NOTIFY_SLEEP, STA_NOTIFY_AWAKE,
 };
 
 /**
  * enum ieee80211_tkip_key_type - get tkip key
  *
  * Used by drivers which need to get a tkip key for skb. Some drivers need a
  * phase 1 key, others need a phase 2 key. A single function allows the driver
  * to get the key, this enum indicates what type of key is required.
  *
  * @IEEE80211_TKIP_P1_KEY: the driver needs a phase 1 key
  * @IEEE80211_TKIP_P2_KEY: the driver needs a phase 2 key
  */
 enum ieee80211_tkip_key_type {
   IEEE80211_TKIP_P1_KEY,
   IEEE80211_TKIP_P2_KEY,
 };
 
 /**
  * enum ieee80211_hw_flags - hardware flags
  *
  * These flags are used to indicate hardware capabilities to
  * the stack. Generally, flags here should have their meaning
  * done in a way that the simplest hardware doesn't need setting
  * any particular flags. There are some exceptions to this rule,
  * however, so you are advised to review these flags carefully.
  *
  * @IEEE80211_HW_RX_INCLUDES_FCS:
  *      Indicates that received frames passed to the stack include
  *      the FCS at the end.
  *
  * @IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING:
  *      Some wireless LAN chipsets buffer broadcast/multicast frames
  *      for power saving stations in the hardware/firmware and others
  *      rely on the host system for such buffering. This option is used
  *      to configure the IEEE 802.11 upper layer to buffer broadcast and
  *      multicast frames when there are power saving stations so that
  *      the driver can fetch them with ieee80211_get_buffered_bc().
  *
  * @IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE:
  *      Hardware is not capable of short slot operation on the 2.4 GHz band.
  *
  * @IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE:
  *      Hardware is not capable of receiving frames with short preamble on
  *      the 2.4 GHz band.
  *
  * @IEEE80211_HW_SIGNAL_UNSPEC:
  *      Hardware can provide signal values but we don't know its units. We
  *      expect values between 0 and @max_signal.
  *      If possible please provide dB or dBm instead.
  *
  * @IEEE80211_HW_SIGNAL_DBM:
  *      Hardware gives signal values in dBm, decibel difference from
  *      one milliwatt. This is the preferred method since it is standardized
  *      between different devices. @max_signal does not need to be set.
  *
  * @IEEE80211_HW_NOISE_DBM:
  *      Hardware can provide noise (radio interference) values in units dBm,
  *      decibel difference from one milliwatt.
  *
  * @IEEE80211_HW_SPECTRUM_MGMT:
  *      Hardware supports spectrum management defined in 802.11h
  *      Measurement, Channel Switch, Quieting, TPC
  *
  * @IEEE80211_HW_AMPDU_AGGREGATION:
  *      Hardware supports 11n A-MPDU aggregation.
  *
  * @IEEE80211_HW_SUPPORTS_PS:
  *      Hardware has power save support (i.e. can go to sleep).
  *
  * @IEEE80211_HW_PS_NULLFUNC_STACK:
  *      Hardware requires nullfunc frame handling in stack, implies
  *      stack support for dynamic PS.
  *
  * @IEEE80211_HW_SUPPORTS_DYNAMIC_PS:
  *      Hardware has support for dynamic PS.
  *
  * @IEEE80211_HW_MFP_CAPABLE:
  *      Hardware supports management frame protection (MFP, IEEE 802.11w).
  *
  * @IEEE80211_HW_BEACON_FILTER:
  *      Hardware supports dropping of irrelevant beacon frames to
  *      avoid waking up cpu.
  */
 enum ieee80211_hw_flags {
   IEEE80211_HW_RX_INCLUDES_FCS                    = 1<<1,
   IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING        = 1<<2,
   IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE          = 1<<3,
   IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE      = 1<<4,
   IEEE80211_HW_SIGNAL_UNSPEC                      = 1<<5,
   IEEE80211_HW_SIGNAL_DBM                         = 1<<6,
   IEEE80211_HW_NOISE_DBM                          = 1<<7,
   IEEE80211_HW_SPECTRUM_MGMT                      = 1<<8,
   IEEE80211_HW_AMPDU_AGGREGATION                  = 1<<9,
   IEEE80211_HW_SUPPORTS_PS                        = 1<<10,
   IEEE80211_HW_PS_NULLFUNC_STACK                  = 1<<11,
   IEEE80211_HW_SUPPORTS_DYNAMIC_PS                = 1<<12,
   IEEE80211_HW_MFP_CAPABLE                        = 1<<13,
   IEEE80211_HW_BEACON_FILTER                      = 1<<14,
 };
 
 /**
  * struct ieee80211_hw - hardware information and state
  *
  * This structure contains the configuration and hardware
  * information for an 802.11 PHY.
  *
  * @wiphy: This points to the &struct wiphy allocated for this
  *      802.11 PHY. You must fill in the @perm_addr and @dev
  *      members of this structure using SET_IEEE80211_DEV()
  *      and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
  *      bands (with channels, bitrates) are registered here.
  *
  * @conf: &struct ieee80211_conf, device configuration, don't use.
  *
  * @priv: pointer to private area that was allocated for driver use
  *      along with this structure.
  *
  * @flags: hardware flags, see &enum ieee80211_hw_flags.
  *
  * @extra_tx_headroom: headroom to reserve in each transmit skb
  *      for use by the driver (e.g. for transmit headers.)
  *
  * @channel_change_time: time (in microseconds) it takes to change channels.
  *
  * @max_signal: Maximum value for signal (rssi) in RX information, used
  *     only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
  *
  * @max_listen_interval: max listen interval in units of beacon interval
  *     that HW supports
  *
  * @queues: number of available hardware transmit queues for
  *      data packets. WMM/QoS requires at least four, these
  *      queues need to have configurable access parameters.
  *
  * @rate_control_algorithm: rate control algorithm for this hardware.
  *      If unset (NULL), the default algorithm will be used. Must be
  *      set before calling ieee80211_register_hw().
  *
  * @vif_data_size: size (in bytes) of the drv_priv data area
  *      within &struct ieee80211_vif.
  * @sta_data_size: size (in bytes) of the drv_priv data area
  *      within &struct ieee80211_sta.
  *
  * @max_rates: maximum number of alternate rate retry stages
  * @max_rate_tries: maximum number of tries for each stage
  */
 struct ieee80211_hw {
   struct ieee80211_conf conf;
   struct wiphy *wiphy;
   const char *rate_control_algorithm;
   void *priv;
   u32 flags;
   unsigned int extra_tx_headroom;
   int channel_change_time;
   int vif_data_size;
   int sta_data_size;
   u16 queues;
   u16 max_listen_interval;
   s8 max_signal;
   u8 max_rates;
   u8 max_rate_tries;
 };
 
 /**
  * wiphy_to_ieee80211_hw - return a mac80211 driver hw struct from a wiphy
  *
  * @wiphy: the &struct wiphy which we want to query
  *
  * mac80211 drivers can use this to get to their respective
  * &struct ieee80211_hw. Drivers wishing to get to their own private
  * structure can then access it via hw->priv. Note that mac802111 drivers should
  * not use wiphy_priv() to try to get their private driver structure as this
  * is already used internally by mac80211.
  */
 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy);
 
 /**
  * SET_IEEE80211_DEV - set device for 802.11 hardware
  *
  * @hw: the &struct ieee80211_hw to set the device for
  * @dev: the &struct device of this 802.11 device
  */
 static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
 {
   set_wiphy_dev(hw->wiphy, dev);
 }
 
 /**
  * SET_IEEE80211_PERM_ADDR - set the permanent MAC address for 802.11 hardware
  *
  * @hw: the &struct ieee80211_hw to set the MAC address for
  * @addr: the address to set
  */
 static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr)
 {
   memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
 }
 
 static inline struct ieee80211_rate *
 ieee80211_get_tx_rate(const struct ieee80211_hw *hw,
                       const struct ieee80211_tx_info *c)
 {
   if (WARN_ON(c->control.rates[0].idx < 0))
     return NULL;
   return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx];
 }
 
 static inline struct ieee80211_rate *
 ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw,
                            const struct ieee80211_tx_info *c)
 {
   if (c->control.rts_cts_rate_idx < 0)
     return NULL;
   return &hw->wiphy->bands[c->band]->bitrates[c->control.rts_cts_rate_idx];
 }
 
 static inline struct ieee80211_rate *
 ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
                              const struct ieee80211_tx_info *c, int idx)
 {
   if (c->control.rates[idx + 1].idx < 0)
     return NULL;
   return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx];
 }
 
 /**
  * DOC: Hardware crypto acceleration
  *
  * mac80211 is capable of taking advantage of many hardware
  * acceleration designs for encryption and decryption operations.
  *
  * The set_key() callback in the &struct ieee80211_ops for a given
  * device is called to enable hardware acceleration of encryption and
  * decryption. The callback takes a @sta parameter that will be NULL
  * for default keys or keys used for transmission only, or point to
  * the station information for the peer for individual keys.
  * Multiple transmission keys with the same key index may be used when
  * VLANs are configured for an access point.
  *
  * When transmitting, the TX control data will use the @hw_key_idx
  * selected by the driver by modifying the &struct ieee80211_key_conf
  * pointed to by the @key parameter to the set_key() function.
  *
  * The set_key() call for the %SET_KEY command should return 0 if
  * the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be
  * added; if you return 0 then hw_key_idx must be assigned to the
  * hardware key index, you are free to use the full u8 range.
  *
  * When the cmd is %DISABLE_KEY then it must succeed.
  *
  * Note that it is permissible to not decrypt a frame even if a key
  * for it has been uploaded to hardware, the stack will not make any
  * decision based on whether a key has been uploaded or not but rather
  * based on the receive flags.
  *
  * The &struct ieee80211_key_conf structure pointed to by the @key
  * parameter is guaranteed to be valid until another call to set_key()
  * removes it, but it can only be used as a cookie to differentiate
  * keys.
  *
  * In TKIP some HW need to be provided a phase 1 key, for RX decryption
  * acceleration (i.e. iwlwifi). Those drivers should provide update_tkip_key
  * handler.
  * The update_tkip_key() call updates the driver with the new phase 1 key.
  * This happens everytime the iv16 wraps around (every 65536 packets). The
  * set_key() call will happen only once for each key (unless the AP did
  * rekeying), it will not include a valid phase 1 key. The valid phase 1 key is
  * provided by update_tkip_key only. The trigger that makes mac80211 call this
  * handler is software decryption with wrap around of iv16.
  */
 
 /**
  * DOC: Powersave support
  *
  * mac80211 has support for various powersave implementations.
  *
  * First, it can support hardware that handles all powersaving by
  * itself, such hardware should simply set the %IEEE80211_HW_SUPPORTS_PS
  * hardware flag. In that case, it will be told about the desired
  * powersave mode depending on the association status, and the driver
  * must take care of sending nullfunc frames when necessary, i.e. when
  * entering and leaving powersave mode. The driver is required to look at
  * the AID in beacons and signal to the AP that it woke up when it finds
  * traffic directed to it. This mode supports dynamic PS by simply
  * enabling/disabling PS.
  *
  * Additionally, such hardware may set the %IEEE80211_HW_SUPPORTS_DYNAMIC_PS
  * flag to indicate that it can support dynamic PS mode itself (see below).
  *
  * Other hardware designs cannot send nullfunc frames by themselves and also
  * need software support for parsing the TIM bitmap. This is also supported
  * by mac80211 by combining the %IEEE80211_HW_SUPPORTS_PS and
  * %IEEE80211_HW_PS_NULLFUNC_STACK flags. The hardware is of course still
  * required to pass up beacons. The hardware is still required to handle
  * waking up for multicast traffic; if it cannot the driver must handle that
  * as best as it can, mac80211 is too slow.
  *
  * Dynamic powersave mode is an extension to normal powersave mode in which
  * the hardware stays awake for a user-specified period of time after sending
  * a frame so that reply frames need not be buffered and therefore delayed
  * to the next wakeup. This can either be supported by hardware, in which case
  * the driver needs to look at the @dynamic_ps_timeout hardware configuration
  * value, or by the stack if all nullfunc handling is in the stack.
  */
 
 /**
  * DOC: Beacon filter support
  *
  * Some hardware have beacon filter support to reduce host cpu wakeups
  * which will reduce system power consumption. It usuallly works so that
  * the firmware creates a checksum of the beacon but omits all constantly
  * changing elements (TSF, TIM etc). Whenever the checksum changes the
  * beacon is forwarded to the host, otherwise it will be just dropped. That
  * way the host will only receive beacons where some relevant information
  * (for example ERP protection or WMM settings) have changed.
  *
  * Beacon filter support is advertised with the %IEEE80211_HW_BEACON_FILTER
  * hardware capability. The driver needs to enable beacon filter support
  * whenever power save is enabled, that is %IEEE80211_CONF_PS is set. When
  * power save is enabled, the stack will not check for beacon loss and the
  * driver needs to notify about loss of beacons with ieee80211_beacon_loss().
  *
  * The time (or number of beacons missed) until the firmware notifies the
  * driver of a beacon loss event (which in turn causes the driver to call
  * ieee80211_beacon_loss()) should be configurable and will be controlled
  * by mac80211 and the roaming algorithm in the future.
  *
  * Since there may be constantly changing information elements that nothing
  * in the software stack cares about, we will, in the future, have mac80211
  * tell the driver which information elements are interesting in the sense
  * that we want to see changes in them. This will include
  *  - a list of information element IDs
  *  - a list of OUIs for the vendor information element
  *
  * Ideally, the hardware would filter out any beacons without changes in the
  * requested elements, but if it cannot support that it may, at the expense
  * of some efficiency, filter out only a subset. For example, if the device
  * doesn't support checking for OUIs it should pass up all changes in all
  * vendor information elements.
  *
  * Note that change, for the sake of simplification, also includes information
  * elements appearing or disappearing from the beacon.
  *
  * Some hardware supports an "ignore list" instead, just make sure nothing
  * that was requested is on the ignore list, and include commonly changing
  * information element IDs in the ignore list, for example 11 (BSS load) and
  * the various vendor-assigned IEs with unknown contents (128, 129, 133-136,
  * 149, 150, 155, 156, 173, 176, 178, 179, 219); for forward compatibility
  * it could also include some currently unused IDs.
  *
  *
  * In addition to these capabilities, hardware should support notifying the
  * host of changes in the beacon RSSI. This is relevant to implement roaming
  * when no traffic is flowing (when traffic is flowing we see the RSSI of
  * the received data packets). This can consist in notifying the host when
  * the RSSI changes significantly or when it drops below or rises above
  * configurable thresholds. In the future these thresholds will also be
  * configured by mac80211 (which gets them from userspace) to implement
  * them as the roaming algorithm requires.
  *
  * If the hardware cannot implement this, the driver should ask it to
  * periodically pass beacon frames to the host so that software can do the
  * signal strength threshold checking.
  */
 
 /**
  * DOC: Frame filtering
  *
  * mac80211 requires to see many management frames for proper
  * operation, and users may want to see many more frames when
  * in monitor mode. However, for best CPU usage and power consumption,
  * having as few frames as possible percolate through the stack is
  * desirable. Hence, the hardware should filter as much as possible.
  *
  * To achieve this, mac80211 uses filter flags (see below) to tell
  * the driver's configure_filter() function which frames should be
  * passed to mac80211 and which should be filtered out.
  *
  * Before configure_filter() is invoked, the prepare_multicast()
  * callback is invoked with the parameters @mc_count and @mc_list
  * for the combined multicast address list of all virtual interfaces.
  * It's use is optional, and it returns a u64 that is passed to
  * configure_filter(). Additionally, configure_filter() has the
  * arguments @changed_flags telling which flags were changed and
  * @total_flags with the new flag states.
  *
  * If your device has no multicast address filters your driver will
  * need to check both the %FIF_ALLMULTI flag and the @mc_count
  * parameter to see whether multicast frames should be accepted
  * or dropped.
  *
  * All unsupported flags in @total_flags must be cleared.
  * Hardware does not support a flag if it is incapable of _passing_
  * the frame to the stack. Otherwise the driver must ignore
  * the flag, but not clear it.
  * You must _only_ clear the flag (announce no support for the
  * flag to mac80211) if you are not able to pass the packet type
  * to the stack (so the hardware always filters it).
  * So for example, you should clear @FIF_CONTROL, if your hardware
  * always filters control frames. If your hardware always passes
  * control frames to the kernel and is incapable of filtering them,
  * you do _not_ clear the @FIF_CONTROL flag.
  * This rule applies to all other FIF flags as well.
  */
 
 /**
  * enum ieee80211_filter_flags - hardware filter flags
  *
  * These flags determine what the filter in hardware should be
  * programmed to let through and what should not be passed to the
  * stack. It is always safe to pass more frames than requested,
  * but this has negative impact on power consumption.
  *
  * @FIF_PROMISC_IN_BSS: promiscuous mode within your BSS,
  *      think of the BSS as your network segment and then this corresponds
  *      to the regular ethernet device promiscuous mode.
  *
  * @FIF_ALLMULTI: pass all multicast frames, this is used if requested
  *      by the user or if the hardware is not capable of filtering by
  *      multicast address.
  *
  * @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the
  *      %RX_FLAG_FAILED_FCS_CRC for them)
  *
  * @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set
  *      the %RX_FLAG_FAILED_PLCP_CRC for them
  *
  * @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate
  *      to the hardware that it should not filter beacons or probe responses
  *      by BSSID. Filtering them can greatly reduce the amount of processing
  *      mac80211 needs to do and the amount of CPU wakeups, so you should
  *      honour this flag if possible.
  *
  * @FIF_CONTROL: pass control frames (except for PS Poll), if PROMISC_IN_BSS
  *  is not set then only those addressed to this station.
  *
  * @FIF_OTHER_BSS: pass frames destined to other BSSes
  *
  * @FIF_PSPOLL: pass PS Poll frames, if PROMISC_IN_BSS  is not set then only
  *  those addressed to this station.
  */
 enum ieee80211_filter_flags {
   FIF_PROMISC_IN_BSS      = 1<<0,
   FIF_ALLMULTI            = 1<<1,
   FIF_FCSFAIL             = 1<<2,
   FIF_PLCPFAIL            = 1<<3,
   FIF_BCN_PRBRESP_PROMISC = 1<<4,
   FIF_CONTROL             = 1<<5,
   FIF_OTHER_BSS           = 1<<6,
   FIF_PSPOLL              = 1<<7,
 };
 
 /**
  * enum ieee80211_ampdu_mlme_action - A-MPDU actions
  *
  * These flags are used with the ampdu_action() callback in
  * &struct ieee80211_ops to indicate which action is needed.
  *
  * Note that drivers MUST be able to deal with a TX aggregation
  * session being stopped even before they OK'ed starting it by
  * calling ieee80211_start_tx_ba_cb(_irqsafe), because the peer
  * might receive the addBA frame and send a delBA right away!
  *
  * @IEEE80211_AMPDU_RX_START: start Rx aggregation
  * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation
  * @IEEE80211_AMPDU_TX_START: start Tx aggregation
  * @IEEE80211_AMPDU_TX_STOP: stop Tx aggregation
  * @IEEE80211_AMPDU_TX_OPERATIONAL: TX aggregation has become operational
  */
 enum ieee80211_ampdu_mlme_action {
   IEEE80211_AMPDU_RX_START,
   IEEE80211_AMPDU_RX_STOP,
   IEEE80211_AMPDU_TX_START,
   IEEE80211_AMPDU_TX_STOP,
   IEEE80211_AMPDU_TX_OPERATIONAL,
 };
 
 #ifdef CONFIG_MAC80211_LEDS
 extern char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw);
 extern char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw);
 extern char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw);
 extern char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw);
 #endif
 /**
  * ieee80211_get_tx_led_name - get name of TX LED
  *
  * mac80211 creates a transmit LED trigger for each wireless hardware
  * that can be used to drive LEDs if your driver registers a LED device.
  * This function returns the name (or %NULL if not configured for LEDs)
  * of the trigger so you can automatically link the LED device.
  *
  * @hw: the hardware to get the LED trigger name for
  */
 static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
 {
 #ifdef CONFIG_MAC80211_LEDS
   return __ieee80211_get_tx_led_name(hw);
 #else
   return NULL;
 #endif
 }
 
 /**
  * ieee80211_get_rx_led_name - get name of RX LED
  *
  * mac80211 creates a receive LED trigger for each wireless hardware
  * that can be used to drive LEDs if your driver registers a LED device.
  * This function returns the name (or %NULL if not configured for LEDs)
  * of the trigger so you can automatically link the LED device.
  *
  * @hw: the hardware to get the LED trigger name for
  */
 static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
 {
 #ifdef CONFIG_MAC80211_LEDS
   return __ieee80211_get_rx_led_name(hw);
 #else
   return NULL;
 #endif
 }
 
 /**
  * ieee80211_get_assoc_led_name - get name of association LED
  *
  * mac80211 creates a association LED trigger for each wireless hardware
  * that can be used to drive LEDs if your driver registers a LED device.
  * This function returns the name (or %NULL if not configured for LEDs)
  * of the trigger so you can automatically link the LED device.
  *
  * @hw: the hardware to get the LED trigger name for
  */
 static inline char *ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
 {
 #ifdef CONFIG_MAC80211_LEDS
   return __ieee80211_get_assoc_led_name(hw);
 #else
   return NULL;
 #endif
 }
 
 /**
  * ieee80211_get_radio_led_name - get name of radio LED
  *
  * mac80211 creates a radio change LED trigger for each wireless hardware
  * that can be used to drive LEDs if your driver registers a LED device.
  * This function returns the name (or %NULL if not configured for LEDs)
  * of the trigger so you can automatically link the LED device.
  *
  * @hw: the hardware to get the LED trigger name for
  */
 static inline char *ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
 {
 #ifdef CONFIG_MAC80211_LEDS
   return __ieee80211_get_radio_led_name(hw);
 #else
   return NULL;
 #endif
 }
 
 /**
  * ieee80211_unregister_hw - Unregister a hardware device
  *
  * This function instructs mac80211 to free allocated resources
  * and unregister netdevices from the networking subsystem.
  *
  * @hw: the hardware to unregister
  */
 void ieee80211_unregister_hw(struct ieee80211_hw *hw);
 
 /**
  * ieee80211_free_hw - free hardware descriptor
  *
  * This function frees everything that was allocated, including the
  * private data for the driver. You must call ieee80211_unregister_hw()
  * before calling this function.
  *
  * @hw: the hardware to free
  */
 void ieee80211_free_hw(struct ieee80211_hw *hw);
 
 /**
  * ieee80211_restart_hw - restart hardware completely
  *
  * Call this function when the hardware was restarted for some reason
  * (hardware error, ...) and the driver is unable to restore its state
  * by itself. mac80211 assumes that at this point the driver/hardware
  * is completely uninitialised and stopped, it starts the process by
  * calling the ->start() operation. The driver will need to reset all
  * internal state that it has prior to calling this function.
  *
  * @hw: the hardware to restart
  */
 void ieee80211_restart_hw(struct ieee80211_hw *hw);
 
 #endif
 
 /**
  * ieee80211_rx - receive frame
  *
  * Use this function to hand received frames to mac80211. The receive
  * buffer in @skb must start with an IEEE 802.11 header or a radiotap
  * header if %RX_FLAG_RADIOTAP is set in the @status flags.
  *
  * This function may not be called in IRQ context. Calls to this function
  * for a single hardware must be synchronized against each other. Calls
  * to this function and ieee80211_rx_irqsafe() may not be mixed for a
  * single hardware.
  *
  * Note that right now, this function must be called with softirqs disabled.
  *
  * @hw: the hardware this frame came in on
  * @skb: the buffer to receive, owned by mac80211 after this call
  */
 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb);
 
 #if 0
 
 /**
  * ieee80211_rx_irqsafe - receive frame
  *
  * Like ieee80211_rx() but can be called in IRQ context
  * (internally defers to a tasklet.)
  *
  * Calls to this function and ieee80211_rx() may not be mixed for a
  * single hardware.
  *
  * @hw: the hardware this frame came in on
  * @skb: the buffer to receive, owned by mac80211 after this call
  */
 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb);
 
 /**
  * ieee80211_tx_status - transmit status callback
  *
  * Call this function for all transmitted frames after they have been
  * transmitted. It is permissible to not call this function for
  * multicast frames but this can affect statistics.
  *
  * This function may not be called in IRQ context. Calls to this function
  * for a single hardware must be synchronized against each other. Calls
  * to this function and ieee80211_tx_status_irqsafe() may not be mixed
  * for a single hardware.
  *
  * @hw: the hardware the frame was transmitted by
  * @skb: the frame that was transmitted, owned by mac80211 after this call
  */
 void ieee80211_tx_status(struct ieee80211_hw *hw,
                          struct sk_buff *skb);
 
 /**
  * ieee80211_tx_status_irqsafe - IRQ-safe transmit status callback
  *
  * Like ieee80211_tx_status() but can be called in IRQ context
  * (internally defers to a tasklet.)
  *
  * Calls to this function and ieee80211_tx_status() may not be mixed for a
  * single hardware.
  *
  * @hw: the hardware the frame was transmitted by
  * @skb: the frame that was transmitted, owned by mac80211 after this call
  */
 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
                                  struct sk_buff *skb);
 
 /**
  * ieee80211_beacon_get - beacon generation function
  * @hw: pointer obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  *
  * If the beacon frames are generated by the host system (i.e., not in
  * hardware/firmware), the low-level driver uses this function to receive
  * the next beacon frame from the 802.11 code. The low-level is responsible
  * for calling this function before beacon data is needed (e.g., based on
  * hardware interrupt). Returned skb is used only once and low-level driver
  * is responsible for freeing it.
  */
 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
                                      struct ieee80211_vif *vif);
 
 /**
  * ieee80211_rts_get - RTS frame generation function
  * @hw: pointer obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  * @frame: pointer to the frame that is going to be protected by the RTS.
  * @frame_len: the frame length (in octets).
  * @frame_txctl: &struct ieee80211_tx_info of the frame.
  * @rts: The buffer where to store the RTS frame.
  *
  * If the RTS frames are generated by the host system (i.e., not in
  * hardware/firmware), the low-level driver uses this function to receive
  * the next RTS frame from the 802.11 code. The low-level is responsible
  * for calling this function before and RTS frame is needed.
  */
 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                        const void *frame, size_t frame_len,
                        const struct ieee80211_tx_info *frame_txctl,
                        struct ieee80211_rts *rts);
 
 /**
  * ieee80211_rts_duration - Get the duration field for an RTS frame
  * @hw: pointer obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  * @frame_len: the length of the frame that is going to be protected by the RTS.
  * @frame_txctl: &struct ieee80211_tx_info of the frame.
  *
  * If the RTS is generated in firmware, but the host system must provide
  * the duration field, the low-level driver uses this function to receive
  * the duration field value in little-endian byteorder.
  */
 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
                               struct ieee80211_vif *vif, size_t frame_len,
                               const struct ieee80211_tx_info *frame_txctl);
 
 /**
  * ieee80211_ctstoself_get - CTS-to-self frame generation function
  * @hw: pointer obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  * @frame: pointer to the frame that is going to be protected by the CTS-to-self.
  * @frame_len: the frame length (in octets).
  * @frame_txctl: &struct ieee80211_tx_info of the frame.
  * @cts: The buffer where to store the CTS-to-self frame.
  *
  * If the CTS-to-self frames are generated by the host system (i.e., not in
  * hardware/firmware), the low-level driver uses this function to receive
  * the next CTS-to-self frame from the 802.11 code. The low-level is responsible
  * for calling this function before and CTS-to-self frame is needed.
  */
 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
                              struct ieee80211_vif *vif,
                              const void *frame, size_t frame_len,
                              const struct ieee80211_tx_info *frame_txctl,
                              struct ieee80211_cts *cts);
 
 /**
  * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame
  * @hw: pointer obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  * @frame_len: the length of the frame that is going to be protected by the CTS-to-self.
  * @frame_txctl: &struct ieee80211_tx_info of the frame.
  *
  * If the CTS-to-self is generated in firmware, but the host system must provide
  * the duration field, the low-level driver uses this function to receive
  * the duration field value in little-endian byteorder.
  */
 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
                                     struct ieee80211_vif *vif,
                                     size_t frame_len,
                                     const struct ieee80211_tx_info *frame_txctl);
 
 /**
  * ieee80211_generic_frame_duration - Calculate the duration field for a frame
  * @hw: pointer obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  * @frame_len: the length of the frame.
  * @rate: the rate at which the frame is going to be transmitted.
  *
  * Calculate the duration field of some generic frame, given its
  * length and transmission rate (in 100kbps).
  */
 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
                                         struct ieee80211_vif *vif,
                                         size_t frame_len,
                                         struct ieee80211_rate *rate);
 
 /**
  * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  *
  * Function for accessing buffered broadcast and multicast frames. If
  * hardware/firmware does not implement buffering of broadcast/multicast
  * frames when power saving is used, 802.11 code buffers them in the host
  * memory. The low-level driver uses this function to fetch next buffered
  * frame. In most cases, this is used when generating beacon frame. This
  * function returns a pointer to the next buffered skb or NULL if no more
  * buffered frames are available.
  *
  * Note: buffered frames are returned only after DTIM beacon frame was
  * generated with ieee80211_beacon_get() and the low-level driver must thus
  * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns
  * NULL if the previous generated beacon was not DTIM, so the low-level driver
  * does not need to check for DTIM beacons separately and should be able to
  * use common code for all beacons.
  */
 struct sk_buff *
 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
 
 /**
  * ieee80211_get_tkip_key - get a TKIP rc4 for skb
  *
  * This function computes a TKIP rc4 key for an skb. It computes
  * a phase 1 key if needed (iv16 wraps around). This function is to
  * be used by drivers which can do HW encryption but need to compute
  * to phase 1/2 key in SW.
  *
  * @keyconf: the parameter passed with the set key
  * @skb: the skb for which the key is needed
  * @type: TBD
  * @key: a buffer to which the key will be written
  */
 void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
                             struct sk_buff *skb,
                             enum ieee80211_tkip_key_type type, u8 *key);
 /**
  * ieee80211_wake_queue - wake specific queue
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @queue: queue number (counted from zero).
  *
  * Drivers should use this function instead of netif_wake_queue.
  */
 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue);
 
 /**
  * ieee80211_stop_queue - stop specific queue
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @queue: queue number (counted from zero).
  *
  * Drivers should use this function instead of netif_stop_queue.
  */
 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue);
 
 /**
  * ieee80211_queue_stopped - test status of the queue
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @queue: queue number (counted from zero).
  *
  * Drivers should use this function instead of netif_stop_queue.
  */
 
 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue);
 
 /**
  * ieee80211_stop_queues - stop all queues
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  *
  * Drivers should use this function instead of netif_stop_queue.
  */
 void ieee80211_stop_queues(struct ieee80211_hw *hw);
 
 /**
  * ieee80211_wake_queues - wake all queues
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  *
  * Drivers should use this function instead of netif_wake_queue.
  */
 void ieee80211_wake_queues(struct ieee80211_hw *hw);
 
 /**
  * ieee80211_scan_completed - completed hardware scan
  *
  * When hardware scan offload is used (i.e. the hw_scan() callback is
  * assigned) this function needs to be called by the driver to notify
  * mac80211 that the scan finished.
  *
  * @hw: the hardware that finished the scan
  * @aborted: set to true if scan was aborted
  */
 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted);
 
 /**
  * ieee80211_iterate_active_interfaces - iterate active interfaces
  *
  * This function iterates over the interfaces associated with a given
  * hardware that are currently active and calls the callback for them.
  * This function allows the iterator function to sleep, when the iterator
  * function is atomic @ieee80211_iterate_active_interfaces_atomic can
  * be used.
  *
  * @hw: the hardware struct of which the interfaces should be iterated over
  * @iterator: the iterator function to call
  * @data: first argument of the iterator function
  */
 void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
                                          void (*iterator)(void *data, u8 *mac,
                                                           struct ieee80211_vif *vif),
                                          void *data);
 
 /**
  * ieee80211_iterate_active_interfaces_atomic - iterate active interfaces
  *
  * This function iterates over the interfaces associated with a given
  * hardware that are currently active and calls the callback for them.
  * This function requires the iterator callback function to be atomic,
  * if that is not desired, use @ieee80211_iterate_active_interfaces instead.
  *
  * @hw: the hardware struct of which the interfaces should be iterated over
  * @iterator: the iterator function to call, cannot sleep
  * @data: first argument of the iterator function
  */
 void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
                                                 void (*iterator)(void *data,
                                                                  u8 *mac,
                                                                  struct ieee80211_vif *vif),
                                                 void *data);
 
 /**
  * ieee80211_queue_work - add work onto the mac80211 workqueue
  *
  * Drivers and mac80211 use this to add work onto the mac80211 workqueue.
  * This helper ensures drivers are not queueing work when they should not be.
  *
  * @hw: the hardware struct for the interface we are adding work for
  * @work: the work we want to add onto the mac80211 workqueue
  */
 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work);
 
 /**
  * ieee80211_queue_delayed_work - add work onto the mac80211 workqueue
  *
  * Drivers and mac80211 use this to queue delayed work onto the mac80211
  * workqueue.
  *
  * @hw: the hardware struct for the interface we are adding work for
  * @dwork: delayable work to queue onto the mac80211 workqueue
  * @delay: number of jiffies to wait before queueing
  */
 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
                                   struct delayed_work *dwork,
                                   unsigned long delay);
 
 /**
  * ieee80211_start_tx_ba_session - Start a tx Block Ack session.
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @ra: receiver address of the BA session recipient
  * @tid: the TID to BA on.
  *
  * Return: success if addBA request was sent, failure otherwise
  *
  * Although mac80211/low level driver/user space application can estimate
  * the need to start aggregation on a certain RA/TID, the session level
  * will be managed by the mac80211.
  */
 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid);
 
 /**
  * ieee80211_start_tx_ba_cb - low level driver ready to aggregate.
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @ra: receiver address of the BA session recipient.
  * @tid: the TID to BA on.
  *
  * This function must be called by low level driver once it has
  * finished with preparations for the BA session.
  */
 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid);
 
 /**
  * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate.
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @ra: receiver address of the BA session recipient.
  * @tid: the TID to BA on.
  *
  * This function must be called by low level driver once it has
  * finished with preparations for the BA session.
  * This version of the function is IRQ-safe.
  */
 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
                                       u16 tid);
 
 /**
  * ieee80211_stop_tx_ba_session - Stop a Block Ack session.
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @ra: receiver address of the BA session recipient
  * @tid: the TID to stop BA.
  * @initiator: if indicates initiator DELBA frame will be sent.
  *
  * Return: error if no sta with matching da found, success otherwise
  *
  * Although mac80211/low level driver/user space application can estimate
  * the need to stop aggregation on a certain RA/TID, the session level
  * will be managed by the mac80211.
  */
 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
                                  u8 *ra, u16 tid,
                                  enum ieee80211_back_parties initiator);
 
 /**
  * ieee80211_stop_tx_ba_cb - low level driver ready to stop aggregate.
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @ra: receiver address of the BA session recipient.
  * @tid: the desired TID to BA on.
  *
  * This function must be called by low level driver once it has
  * finished with preparations for the BA session tear down.
  */
 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid);
 
 /**
  * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate.
  * @hw: pointer as obtained from ieee80211_alloc_hw().
  * @ra: receiver address of the BA session recipient.
  * @tid: the desired TID to BA on.
  *
  * This function must be called by low level driver once it has
  * finished with preparations for the BA session tear down.
  * This version of the function is IRQ-safe.
  */
 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
                                      u16 tid);
 
 /**
  * ieee80211_find_sta - find a station
  *
  * @hw: pointer as obtained from ieee80211_alloc_hw()
  * @addr: station's address
  *
  * This function must be called under RCU lock and the
  * resulting pointer is only valid under RCU lock as well.
  */
 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
                                          const u8 *addr);
 
 /**
  * ieee80211_beacon_loss - inform hardware does not receive beacons
  *
  * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
  *
  * When beacon filtering is enabled with IEEE80211_HW_BEACON_FILTERING and
  * IEEE80211_CONF_PS is set, the driver needs to inform whenever the
  * hardware is not receiving beacons with this function.
  */
 void ieee80211_beacon_loss(struct ieee80211_vif *vif);
 
 /* Rate control API */
 
 /**
  * enum rate_control_changed - flags to indicate which parameter changed
  *
  * @IEEE80211_RC_HT_CHANGED: The HT parameters of the operating channel have
  *      changed, rate control algorithm can update its internal state if needed.
  */
 enum rate_control_changed {
   IEEE80211_RC_HT_CHANGED = BIT(0)
 };
 
 /**
  * struct ieee80211_tx_rate_control - rate control information for/from RC algo
  *
  * @hw: The hardware the algorithm is invoked for.
  * @sband: The band this frame is being transmitted on.
  * @bss_conf: the current BSS configuration
  * @reported_rate: The rate control algorithm can fill this in to indicate
  *      which rate should be reported to userspace as the current rate and
  *      used for rate calculations in the mesh network.
  * @rts: whether RTS will be used for this frame because it is longer than the
  *      RTS threshold
  * @short_preamble: whether mac80211 will request short-preamble transmission
  *      if the selected rate supports it
  * @max_rate_idx: user-requested maximum rate (not MCS for now)
  * @skb: the skb that will be transmitted, the control information in it needs
  *      to be filled in
  */
 struct ieee80211_tx_rate_control {
   struct ieee80211_hw *hw;
   struct ieee80211_supported_band *sband;
   struct ieee80211_bss_conf *bss_conf;
   struct sk_buff *skb;
   struct ieee80211_tx_rate reported_rate;
   bool rts, short_preamble;
   u8 max_rate_idx;
 };
 
 struct rate_control_ops {
   struct module *module;
   const char *name;
   void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir);
   void (*free)(void *priv);
 
   void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp);
   void (*rate_init)(void *priv, struct ieee80211_supported_band *sband,
                     struct ieee80211_sta *sta, void *priv_sta);
   void (*rate_update)(void *priv, struct ieee80211_supported_band *sband,
                       struct ieee80211_sta *sta,
                       void *priv_sta, u32 changed);
   void (*free_sta)(void *priv, struct ieee80211_sta *sta,
                    void *priv_sta);
 
   void (*tx_status)(void *priv, struct ieee80211_supported_band *sband,
                     struct ieee80211_sta *sta, void *priv_sta,
                     struct sk_buff *skb);
   void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta,
                    struct ieee80211_tx_rate_control *txrc);
 
   void (*add_sta_debugfs)(void *priv, void *priv_sta,
                           struct dentry *dir);
   void (*remove_sta_debugfs)(void *priv, void *priv_sta);
 };
 
 static inline int rate_supported(struct ieee80211_sta *sta,
                                  enum ieee80211_band band,
                                  int index)
 {
   return (sta == NULL || sta->supp_rates[band] & BIT(index));
 }
 
 /**
  * rate_control_send_low - helper for drivers for management/no-ack frames
  *
  * Rate control algorithms that agree to use the lowest rate to
  * send management frames and NO_ACK data with the respective hw
  * retries should use this in the beginning of their mac80211 get_rate
  * callback. If true is returned the rate control can simply return.
  * If false is returned we guarantee that sta and sta and priv_sta is
  * not null.
  *
  * Rate control algorithms wishing to do more intelligent selection of
  * rate for multicast/broadcast frames may choose to not use this.
  *
  * @sta: &struct ieee80211_sta pointer to the target destination. Note
  *      that this may be null.
  * @priv_sta: private rate control structure. This may be null.
  * @txrc: rate control information we sholud populate for mac80211.
  */
 bool rate_control_send_low(struct ieee80211_sta *sta,
                            void *priv_sta,
                            struct ieee80211_tx_rate_control *txrc);
 
 
 static inline s8
 rate_lowest_index(struct ieee80211_supported_band *sband,
                   struct ieee80211_sta *sta)
 {
   int i;
 
   for (i = 0; i < sband->n_bitrates; i++)
     if (rate_supported(sta, sband->band, i))
       return i;
 
   /* warn when we cannot find a rate. */
   WARN_ON(1);
 
   return 0;
 }
 
 static inline
 bool rate_usable_index_exists(struct ieee80211_supported_band *sband,
                               struct ieee80211_sta *sta)
 {
   unsigned int i;
 
   for (i = 0; i < sband->n_bitrates; i++)
     if (rate_supported(sta, sband->band, i))
       return true;
   return false;
 }
 
 int ieee80211_rate_control_register(struct rate_control_ops *ops);
 void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
 
 static inline bool
 conf_is_ht20(struct ieee80211_conf *conf)
 {
   return conf->channel_type == NL80211_CHAN_HT20;
 }
 
 static inline bool
 conf_is_ht40_minus(struct ieee80211_conf *conf)
 {
   return conf->channel_type == NL80211_CHAN_HT40MINUS;
 }
 
 static inline bool
 conf_is_ht40_plus(struct ieee80211_conf *conf)
 {
   return conf->channel_type == NL80211_CHAN_HT40PLUS;
 }
 
 static inline bool
 conf_is_ht40(struct ieee80211_conf *conf)
 {
   return conf_is_ht40_minus(conf) || conf_is_ht40_plus(conf);
 }
 
 static inline bool
 conf_is_ht(struct ieee80211_conf *conf)
 {
   return conf->channel_type != NL80211_CHAN_NO_HT;
 }
 
 #endif
 
 u16 ieee80211_calc_duration (u32 len, s16 rate);
 
 #endif /* MAC80211_H */
 
 /*
  * Local Variables:
  * indent-tabs-mode: nil
  * mode: C
  * c-file-style: "gnu"
  * c-basic-offset: 2
  * End:
  */
 
 /* vi: set et sw=2 sts=2: */