ieee80211_i.h

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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <[email protected]>
 * Copyright 2007-2010  Johannes Berg <[email protected]>
 *
 * 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 IEEE80211_I_H
#define IEEE80211_I_H

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/if_ether.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/etherdevice.h>
#include <linux/leds.h>
#include <linux/idr.h>
#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include "key.h"
#include "sta_info.h"
#include "debug.h"

struct ieee80211_local;

/* Maximum number of broadcast/multicast frames to buffer when some of the
 * associated stations are using power saving. */
#define AP_MAX_BC_BUFFER 128

/* Maximum number of frames buffered to all STAs, including multicast frames.
 * Note: increasing this limit increases the potential memory requirement. Each
 * frame can be up to about 2 kB long. */
#define TOTAL_MAX_TX_BUFFER 512

/* Required encryption head and tailroom */
#define IEEE80211_ENCRYPT_HEADROOM 8
#define IEEE80211_ENCRYPT_TAILROOM 18

/* IEEE 802.11 (Ch. 9.5 Defragmentation) requires support for concurrent
 * reception of at least three fragmented frames. This limit can be increased
 * by changing this define, at the cost of slower frame reassembly and
 * increased memory use (about 2 kB of RAM per entry). */
#define IEEE80211_FRAGMENT_MAX 4

#define TU_TO_JIFFIES(x)    (usecs_to_jiffies((x) * 1024))
#define TU_TO_EXP_TIME(x)   (jiffies + TU_TO_JIFFIES(x))

/*
 * Some APs experience problems when working with U-APSD. Decrease the
 * probability of that happening by using legacy mode for all ACs but VO.
 * The AP that caused us trouble was a Cisco 4410N. It ignores our
 * setting, and always treats non-VO ACs as legacy.
 */
#define IEEE80211_DEFAULT_UAPSD_QUEUES \
    IEEE80211_WMM_IE_STA_QOSINFO_AC_VO

#define IEEE80211_DEFAULT_MAX_SP_LEN        \
    IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL

#define IEEE80211_DEAUTH_FRAME_LEN  (24 /* hdr */ + 2 /* reason */)

struct ieee80211_fragment_entry {
    unsigned long first_frag_time;
    unsigned int seq;
    unsigned int rx_queue;
    unsigned int last_frag;
    unsigned int extra_len;
    struct sk_buff_head skb_list;
    int ccmp; /* Whether fragments were encrypted with CCMP */
    u8 last_pn[6]; /* PN of the last fragment if CCMP was used */
};


struct ieee80211_bss {
    /* don't want to look up all the time */
    size_t ssid_len;
    u8 ssid[IEEE80211_MAX_SSID_LEN];

    u32 device_ts;

    u8 dtim_period;

    bool wmm_used;
    bool uapsd_supported;

    unsigned long last_probe_resp;

#ifdef CONFIG_MAC80211_MESH
    u8 *mesh_id;
    size_t mesh_id_len;
    u8 *mesh_cfg;
#endif

#define IEEE80211_MAX_SUPP_RATES 32
    u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
    size_t supp_rates_len;

    /*
     * During association, we save an ERP value from a probe response so
     * that we can feed ERP info to the driver when handling the
     * association completes. these fields probably won't be up-to-date
     * otherwise, you probably don't want to use them.
     */
    bool has_erp_value;
    u8 erp_value;

    /* Keep track of the corruption of the last beacon/probe response. */
    u8 corrupt_data;

    /* Keep track of what bits of information we have valid info for. */
    u8 valid_data;
};

enum ieee80211_bss_corrupt_data_flags {
    IEEE80211_BSS_CORRUPT_BEACON        = BIT(0),
    IEEE80211_BSS_CORRUPT_PROBE_RESP    = BIT(1)
};

enum ieee80211_bss_valid_data_flags {
    IEEE80211_BSS_VALID_DTIM        = BIT(0),
    IEEE80211_BSS_VALID_WMM         = BIT(1),
    IEEE80211_BSS_VALID_RATES       = BIT(2),
    IEEE80211_BSS_VALID_ERP         = BIT(3)
};

static inline u8 *bss_mesh_cfg(struct ieee80211_bss *bss)
{
#ifdef CONFIG_MAC80211_MESH
    return bss->mesh_cfg;
#endif
    return NULL;
}

static inline u8 *bss_mesh_id(struct ieee80211_bss *bss)
{
#ifdef CONFIG_MAC80211_MESH
    return bss->mesh_id;
#endif
    return NULL;
}

static inline u8 bss_mesh_id_len(struct ieee80211_bss *bss)
{
#ifdef CONFIG_MAC80211_MESH
    return bss->mesh_id_len;
#endif
    return 0;
}


typedef unsigned __bitwise__ ieee80211_tx_result;
#define TX_CONTINUE ((__force ieee80211_tx_result) 0u)
#define TX_DROP     ((__force ieee80211_tx_result) 1u)
#define TX_QUEUED   ((__force ieee80211_tx_result) 2u)

#define IEEE80211_TX_UNICAST        BIT(1)
#define IEEE80211_TX_PS_BUFFERED    BIT(2)

struct ieee80211_tx_data {
    struct sk_buff *skb;
    struct sk_buff_head skbs;
    struct ieee80211_local *local;
    struct ieee80211_sub_if_data *sdata;
    struct sta_info *sta;
    struct ieee80211_key *key;

    unsigned int flags;
};


typedef unsigned __bitwise__ ieee80211_rx_result;
#define RX_CONTINUE     ((__force ieee80211_rx_result) 0u)
#define RX_DROP_UNUSABLE    ((__force ieee80211_rx_result) 1u)
#define RX_DROP_MONITOR     ((__force ieee80211_rx_result) 2u)
#define RX_QUEUED       ((__force ieee80211_rx_result) 3u)

enum ieee80211_packet_rx_flags {
    IEEE80211_RX_RA_MATCH           = BIT(1),
    IEEE80211_RX_FRAGMENTED         = BIT(2),
    IEEE80211_RX_AMSDU          = BIT(3),
    IEEE80211_RX_MALFORMED_ACTION_FRM   = BIT(4),
    IEEE80211_RX_DEFERRED_RELEASE       = BIT(5),
};

enum ieee80211_rx_flags {
    IEEE80211_RX_CMNTR      = BIT(0),
    IEEE80211_RX_BEACON_REPORTED    = BIT(1),
};

struct ieee80211_rx_data {
    struct sk_buff *skb;
    struct ieee80211_local *local;
    struct ieee80211_sub_if_data *sdata;
    struct sta_info *sta;
    struct ieee80211_key *key;

    unsigned int flags;

    /*
     * Index into sequence numbers array, 0..16
     * since the last (16) is used for non-QoS,
     * will be 16 on non-QoS frames.
     */
    int seqno_idx;

    /*
     * Index into the security IV/PN arrays, 0..16
     * since the last (16) is used for CCMP-encrypted
     * management frames, will be set to 16 on mgmt
     * frames and 0 on non-QoS frames.
     */
    int security_idx;

    u32 tkip_iv32;
    u16 tkip_iv16;
};

struct beacon_data {
    u8 *head, *tail;
    int head_len, tail_len;
    struct rcu_head rcu_head;
};

struct probe_resp {
    struct rcu_head rcu_head;
    int len;
    u8 data[0];
};

struct ieee80211_if_ap {
    struct beacon_data __rcu *beacon;
    struct probe_resp __rcu *probe_resp;

    struct list_head vlans;

    /* yes, this looks ugly, but guarantees that we can later use
     * bitmap_empty :)
     * NB: don't touch this bitmap, use sta_info_{set,clear}_tim_bit */
    u8 tim[sizeof(unsigned long) * BITS_TO_LONGS(IEEE80211_MAX_AID + 1)];
    struct sk_buff_head ps_bc_buf;
    atomic_t num_sta_ps; /* number of stations in PS mode */
    atomic_t num_mcast_sta; /* number of stations receiving multicast */
    int dtim_count;
    bool dtim_bc_mc;
};

struct ieee80211_if_wds {
    struct sta_info *sta;
    u8 remote_addr[ETH_ALEN];
};

struct ieee80211_if_vlan {
    struct list_head list;

    /* used for all tx if the VLAN is configured to 4-addr mode */
    struct sta_info __rcu *sta;
};

struct mesh_stats {
    __u32 fwded_mcast;      /* Mesh forwarded multicast frames */
    __u32 fwded_unicast;        /* Mesh forwarded unicast frames */
    __u32 fwded_frames;     /* Mesh total forwarded frames */
    __u32 dropped_frames_ttl;   /* Not transmitted since mesh_ttl == 0*/
    __u32 dropped_frames_no_route;  /* Not transmitted, no route found */
    __u32 dropped_frames_congestion;/* Not forwarded due to congestion */
    atomic_t estab_plinks;
};

#define PREQ_Q_F_START      0x1
#define PREQ_Q_F_REFRESH    0x2
struct mesh_preq_queue {
    struct list_head list;
    u8 dst[ETH_ALEN];
    u8 flags;
};

#if HZ/100 == 0
#define IEEE80211_ROC_MIN_LEFT  1
#else
#define IEEE80211_ROC_MIN_LEFT  (HZ/100)
#endif

struct ieee80211_roc_work {
    struct list_head list;
    struct list_head dependents;

    struct delayed_work work;

    struct ieee80211_sub_if_data *sdata;

    struct ieee80211_channel *chan;
    enum nl80211_channel_type chan_type;

    bool started, abort, hw_begun, notified;

    unsigned long hw_start_time;

    u32 duration, req_duration;
    struct sk_buff *frame;
    u64 mgmt_tx_cookie;
};

/* flags used in struct ieee80211_if_managed.flags */
enum ieee80211_sta_flags {
    IEEE80211_STA_BEACON_POLL   = BIT(0),
    IEEE80211_STA_CONNECTION_POLL   = BIT(1),
    IEEE80211_STA_CONTROL_PORT  = BIT(2),
    IEEE80211_STA_DISABLE_11N   = BIT(4),
    IEEE80211_STA_CSA_RECEIVED  = BIT(5),
    IEEE80211_STA_MFP_ENABLED   = BIT(6),
    IEEE80211_STA_UAPSD_ENABLED = BIT(7),
    IEEE80211_STA_NULLFUNC_ACKED    = BIT(8),
    IEEE80211_STA_RESET_SIGNAL_AVE  = BIT(9),
    IEEE80211_STA_DISABLE_40MHZ = BIT(10),
    IEEE80211_STA_DISABLE_VHT   = BIT(11),
};

struct ieee80211_mgd_auth_data {
    struct cfg80211_bss *bss;
    unsigned long timeout;
    int tries;
    u16 algorithm, expected_transaction;

    u8 key[WLAN_KEY_LEN_WEP104];
    u8 key_len, key_idx;
    bool done;

    size_t ie_len;
    u8 ie[];
};

struct ieee80211_mgd_assoc_data {
    struct cfg80211_bss *bss;
    const u8 *supp_rates;

    unsigned long timeout;
    int tries;

    u16 capability;
    u8 prev_bssid[ETH_ALEN];
    u8 ssid[IEEE80211_MAX_SSID_LEN];
    u8 ssid_len;
    u8 supp_rates_len;
    bool wmm, uapsd;
    bool have_beacon;
    bool sent_assoc;
    bool synced;

    u8 ap_ht_param;

    size_t ie_len;
    u8 ie[];
};

struct ieee80211_if_managed {
    struct timer_list timer;
    struct timer_list conn_mon_timer;
    struct timer_list bcn_mon_timer;
    struct timer_list chswitch_timer;
    struct work_struct monitor_work;
    struct work_struct chswitch_work;
    struct work_struct beacon_connection_loss_work;
    struct work_struct csa_connection_drop_work;

    unsigned long beacon_timeout;
    unsigned long probe_timeout;
    int probe_send_count;
    bool nullfunc_failed;

    struct mutex mtx;
    struct cfg80211_bss *associated;
    struct ieee80211_mgd_auth_data *auth_data;
    struct ieee80211_mgd_assoc_data *assoc_data;

    u8 bssid[ETH_ALEN];

    u16 aid;

    unsigned long timers_running; /* used for quiesce/restart */
    bool powersave; /* powersave requested for this iface */
    bool broken_ap; /* AP is broken -- turn off powersave */
    enum ieee80211_smps_mode req_smps, /* requested smps mode */
                 ap_smps, /* smps mode AP thinks we're in */
                 driver_smps_mode; /* smps mode request */

    struct work_struct request_smps_work;

    unsigned int flags;

    bool beacon_crc_valid;
    u32 beacon_crc;

    enum {
        IEEE80211_MFP_DISABLED,
        IEEE80211_MFP_OPTIONAL,
        IEEE80211_MFP_REQUIRED
    } mfp; /* management frame protection */

    /*
     * Bitmask of enabled u-apsd queues,
     * IEEE80211_WMM_IE_STA_QOSINFO_AC_BE & co. Needs a new association
     * to take effect.
     */
    unsigned int uapsd_queues;

    /*
     * Maximum number of buffered frames AP can deliver during a
     * service period, IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL or similar.
     * Needs a new association to take effect.
     */
    unsigned int uapsd_max_sp_len;

    int wmm_last_param_set;

    u8 use_4addr;

    /* Signal strength from the last Beacon frame in the current BSS. */
    int last_beacon_signal;

    /*
     * Weighted average of the signal strength from Beacon frames in the
     * current BSS. This is in units of 1/16 of the signal unit to maintain
     * accuracy and to speed up calculations, i.e., the value need to be
     * divided by 16 to get the actual value.
     */
    int ave_beacon_signal;

    /*
     * Number of Beacon frames used in ave_beacon_signal. This can be used
     * to avoid generating less reliable cqm events that would be based
     * only on couple of received frames.
     */
    unsigned int count_beacon_signal;

    /*
     * Last Beacon frame signal strength average (ave_beacon_signal / 16)
     * that triggered a cqm event. 0 indicates that no event has been
     * generated for the current association.
     */
    int last_cqm_event_signal;

    /*
     * State variables for keeping track of RSSI of the AP currently
     * connected to and informing driver when RSSI has gone
     * below/above a certain threshold.
     */
    int rssi_min_thold, rssi_max_thold;
    int last_ave_beacon_signal;

    struct ieee80211_ht_cap ht_capa; /* configured ht-cap over-rides */
    struct ieee80211_ht_cap ht_capa_mask; /* Valid parts of ht_capa */
};

struct ieee80211_if_ibss {
    struct timer_list timer;

    struct mutex mtx;

    unsigned long last_scan_completed;

    u32 basic_rates;

    bool timer_running;

    bool fixed_bssid;
    bool fixed_channel;
    bool privacy;

    bool control_port;
    unsigned int auth_frame_registrations;

    u8 bssid[ETH_ALEN] __aligned(2);
    u8 ssid[IEEE80211_MAX_SSID_LEN];
    u8 ssid_len, ie_len;
    u8 *ie;
    struct ieee80211_channel *channel;
    enum nl80211_channel_type channel_type;

    unsigned long ibss_join_req;
    /* probe response/beacon for IBSS */
    struct sk_buff __rcu *presp;
    struct sk_buff *skb;

    spinlock_t incomplete_lock;
    struct list_head incomplete_stations;

    enum {
        IEEE80211_IBSS_MLME_SEARCH,
        IEEE80211_IBSS_MLME_JOINED,
    } state;
};

struct ieee802_11_elems;
struct ieee80211_mesh_sync_ops {
    void (*rx_bcn_presp)(struct ieee80211_sub_if_data *sdata,
                 u16 stype,
                 struct ieee80211_mgmt *mgmt,
                 struct ieee802_11_elems *elems,
                 struct ieee80211_rx_status *rx_status);
    void (*adjust_tbtt)(struct ieee80211_sub_if_data *sdata);
    /* add other framework functions here */
};

struct ieee80211_if_mesh {
    struct timer_list housekeeping_timer;
    struct timer_list mesh_path_timer;
    struct timer_list mesh_path_root_timer;

    unsigned long timers_running;

    unsigned long wrkq_flags;

    u8 mesh_id[IEEE80211_MAX_MESH_ID_LEN];
    size_t mesh_id_len;
    /* Active Path Selection Protocol Identifier */
    u8 mesh_pp_id;
    /* Active Path Selection Metric Identifier */
    u8 mesh_pm_id;
    /* Congestion Control Mode Identifier */
    u8 mesh_cc_id;
    /* Synchronization Protocol Identifier */
    u8 mesh_sp_id;
    /* Authentication Protocol Identifier */
    u8 mesh_auth_id;
    /* Local mesh Sequence Number */
    u32 sn;
    /* Last used PREQ ID */
    u32 preq_id;
    atomic_t mpaths;
    /* Timestamp of last SN update */
    unsigned long last_sn_update;
    /* Time when it's ok to send next PERR */
    unsigned long next_perr;
    /* Timestamp of last PREQ sent */
    unsigned long last_preq;
    struct mesh_rmc *rmc;
    spinlock_t mesh_preq_queue_lock;
    struct mesh_preq_queue preq_queue;
    int preq_queue_len;
    struct mesh_stats mshstats;
    struct mesh_config mshcfg;
    u32 mesh_seqnum;
    bool accepting_plinks;
    int num_gates;
    const u8 *ie;
    u8 ie_len;
    enum {
        IEEE80211_MESH_SEC_NONE = 0x0,
        IEEE80211_MESH_SEC_AUTHED = 0x1,
        IEEE80211_MESH_SEC_SECURED = 0x2,
    } security;
    /* Extensible Synchronization Framework */
    struct ieee80211_mesh_sync_ops *sync_ops;
    s64 sync_offset_clockdrift_max;
    spinlock_t sync_offset_lock;
    bool adjusting_tbtt;
};

#ifdef CONFIG_MAC80211_MESH
#define IEEE80211_IFSTA_MESH_CTR_INC(msh, name) \
    do { (msh)->mshstats.name++; } while (0)
#else
#define IEEE80211_IFSTA_MESH_CTR_INC(msh, name) \
    do { } while (0)
#endif

enum ieee80211_sub_if_data_flags {
    IEEE80211_SDATA_ALLMULTI        = BIT(0),
    IEEE80211_SDATA_PROMISC         = BIT(1),
    IEEE80211_SDATA_OPERATING_GMODE     = BIT(2),
    IEEE80211_SDATA_DONT_BRIDGE_PACKETS = BIT(3),
    IEEE80211_SDATA_DISCONNECT_RESUME   = BIT(4),
    IEEE80211_SDATA_IN_DRIVER       = BIT(5),
};

enum ieee80211_sdata_state_bits {
    SDATA_STATE_RUNNING,
    SDATA_STATE_OFFCHANNEL,
};

struct ieee80211_sub_if_data {
    struct list_head list;

    struct wireless_dev wdev;

    /* keys */
    struct list_head key_list;

    /* count for keys needing tailroom space allocation */
    int crypto_tx_tailroom_needed_cnt;

    struct net_device *dev;
    struct ieee80211_local *local;

    unsigned int flags;

    unsigned long state;

    int drop_unencrypted;

    char name[IFNAMSIZ];

    /* to detect idle changes */
    bool old_idle;

    /* Fragment table for host-based reassembly */
    struct ieee80211_fragment_entry fragments[IEEE80211_FRAGMENT_MAX];
    unsigned int fragment_next;

    /* TID bitmap for NoAck policy */
    u16 noack_map;

    /* bit field of ACM bits (BIT(802.1D tag)) */
    u8 wmm_acm;

    struct ieee80211_key __rcu *keys[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
    struct ieee80211_key __rcu *default_unicast_key;
    struct ieee80211_key __rcu *default_multicast_key;
    struct ieee80211_key __rcu *default_mgmt_key;

    u16 sequence_number;
    __be16 control_port_protocol;
    bool control_port_no_encrypt;

    struct ieee80211_tx_queue_params tx_conf[IEEE80211_NUM_ACS];

    struct work_struct work;
    struct sk_buff_head skb_queue;

    bool arp_filter_state;

    /*
     * AP this belongs to: self in AP mode and
     * corresponding AP in VLAN mode, NULL for
     * all others (might be needed later in IBSS)
     */
    struct ieee80211_if_ap *bss;

    /* bitmap of allowed (non-MCS) rate indexes for rate control */
    u32 rc_rateidx_mask[IEEE80211_NUM_BANDS];
    u8  rc_rateidx_mcs_mask[IEEE80211_NUM_BANDS][IEEE80211_HT_MCS_MASK_LEN];

    union {
        struct ieee80211_if_ap ap;
        struct ieee80211_if_wds wds;
        struct ieee80211_if_vlan vlan;
        struct ieee80211_if_managed mgd;
        struct ieee80211_if_ibss ibss;
        struct ieee80211_if_mesh mesh;
        u32 mntr_flags;
    } u;

#ifdef CONFIG_MAC80211_DEBUGFS
    struct {
        struct dentry *dir;
        struct dentry *subdir_stations;
        struct dentry *default_unicast_key;
        struct dentry *default_multicast_key;
        struct dentry *default_mgmt_key;
    } debugfs;
#endif
    /* must be last, dynamically sized area in this! */
    struct ieee80211_vif vif;
};

static inline
struct ieee80211_sub_if_data *vif_to_sdata(struct ieee80211_vif *p)
{
    return container_of(p, struct ieee80211_sub_if_data, vif);
}

enum sdata_queue_type {
    IEEE80211_SDATA_QUEUE_TYPE_FRAME    = 0,
    IEEE80211_SDATA_QUEUE_AGG_START     = 1,
    IEEE80211_SDATA_QUEUE_AGG_STOP      = 2,
};

enum {
    IEEE80211_RX_MSG    = 1,
    IEEE80211_TX_STATUS_MSG = 2,
    IEEE80211_EOSP_MSG  = 3,
};

struct skb_eosp_msg_data {
    u8 sta[ETH_ALEN], iface[ETH_ALEN];
};

enum queue_stop_reason {
    IEEE80211_QUEUE_STOP_REASON_DRIVER,
    IEEE80211_QUEUE_STOP_REASON_PS,
    IEEE80211_QUEUE_STOP_REASON_CSA,
    IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
    IEEE80211_QUEUE_STOP_REASON_SUSPEND,
    IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
};

#ifdef CONFIG_MAC80211_LEDS
struct tpt_led_trigger {
    struct led_trigger trig;
    char name[32];
    const struct ieee80211_tpt_blink *blink_table;
    unsigned int blink_table_len;
    struct timer_list timer;
    unsigned long prev_traffic;
    unsigned long tx_bytes, rx_bytes;
    unsigned int active, want;
    bool running;
};
#endif

enum {
    SCAN_SW_SCANNING,
    SCAN_HW_SCANNING,
    SCAN_ONCHANNEL_SCANNING,
    SCAN_COMPLETED,
    SCAN_ABORTED,
};

enum mac80211_scan_state {
    SCAN_DECISION,
    SCAN_SET_CHANNEL,
    SCAN_SEND_PROBE,
    SCAN_SUSPEND,
    SCAN_RESUME,
};

struct ieee80211_local {
    /* embed the driver visible part.
     * don't cast (use the static inlines below), but we keep
     * it first anyway so they become a no-op */
    struct ieee80211_hw hw;

    const struct ieee80211_ops *ops;

    /*
     * private workqueue to mac80211. mac80211 makes this accessible
     * via ieee80211_queue_work()
     */
    struct workqueue_struct *workqueue;

    unsigned long queue_stop_reasons[IEEE80211_MAX_QUEUES];
    /* also used to protect ampdu_ac_queue and amdpu_ac_stop_refcnt */
    spinlock_t queue_stop_reason_lock;

    int open_count;
    int monitors, cooked_mntrs;
    /* number of interfaces with corresponding FIF_ flags */
    int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll,
        fif_probe_req;
    int probe_req_reg;
    unsigned int filter_flags; /* FIF_* */

    bool wiphy_ciphers_allocated;

    /* protects the aggregated multicast list and filter calls */
    spinlock_t filter_lock;

    /* used for uploading changed mc list */
    struct work_struct reconfig_filter;

    /* used to reconfigure hardware SM PS */
    struct work_struct recalc_smps;

    /* aggregated multicast list */
    struct netdev_hw_addr_list mc_list;

    bool tim_in_locked_section; /* see ieee80211_beacon_get() */

    /*
     * suspended is true if we finished all the suspend _and_ we have
     * not yet come up from resume. This is to be used by mac80211
     * to ensure driver sanity during suspend and mac80211's own
     * sanity. It can eventually be used for WoW as well.
     */
    bool suspended;

    /*
     * Resuming is true while suspended, but when we're reprogramming the
     * hardware -- at that time it's allowed to use ieee80211_queue_work()
     * again even though some other parts of the stack are still suspended
     * and we still drop received frames to avoid waking the stack.
     */
    bool resuming;

    /*
     * quiescing is true during the suspend process _only_ to
     * ease timer cancelling etc.
     */
    bool quiescing;

    /* device is started */
    bool started;

    /* device is during a HW reconfig */
    bool in_reconfig;

    /* wowlan is enabled -- don't reconfig on resume */
    bool wowlan;

    int tx_headroom; /* required headroom for hardware/radiotap */

    /* Tasklet and skb queue to process calls from IRQ mode. All frames
     * added to skb_queue will be processed, but frames in
     * skb_queue_unreliable may be dropped if the total length of these
     * queues increases over the limit. */
#define IEEE80211_IRQSAFE_QUEUE_LIMIT 128
    struct tasklet_struct tasklet;
    struct sk_buff_head skb_queue;
    struct sk_buff_head skb_queue_unreliable;

    /*
     * Internal FIFO queue which is shared between multiple rx path
     * stages. Its main task is to provide a serialization mechanism,
     * so all rx handlers can enjoy having exclusive access to their
     * private data structures.
     */
    struct sk_buff_head rx_skb_queue;
    bool running_rx_handler;    /* protected by rx_skb_queue.lock */

    /* Station data */
    /*
     * The mutex only protects the list, hash table and
     * counter, reads are done with RCU.
     */
    struct mutex sta_mtx;
    spinlock_t tim_lock;
    unsigned long num_sta;
    struct list_head sta_list;
    struct sta_info __rcu *sta_hash[STA_HASH_SIZE];
    struct timer_list sta_cleanup;
    int sta_generation;

    struct sk_buff_head pending[IEEE80211_MAX_QUEUES];
    struct tasklet_struct tx_pending_tasklet;

    atomic_t agg_queue_stop[IEEE80211_MAX_QUEUES];

    /* number of interfaces with corresponding IFF_ flags */
    atomic_t iff_allmultis, iff_promiscs;

    struct rate_control_ref *rate_ctrl;

    struct crypto_cipher *wep_tx_tfm;
    struct crypto_cipher *wep_rx_tfm;
    u32 wep_iv;

    /* see iface.c */
    struct list_head interfaces;
    struct mutex iflist_mtx;

    /*
     * Key mutex, protects sdata's key_list and sta_info's
     * key pointers (write access, they're RCU.)
     */
    struct mutex key_mtx;

    /* mutex for scan and work locking */
    struct mutex mtx;

    /* Scanning and BSS list */
    unsigned long scanning;
    struct cfg80211_ssid scan_ssid;
    struct cfg80211_scan_request *int_scan_req;
    struct cfg80211_scan_request *scan_req, *hw_scan_req;
    struct ieee80211_channel *scan_channel;
    enum ieee80211_band hw_scan_band;
    int scan_channel_idx;
    int scan_ies_len;

    struct work_struct sched_scan_stopped_work;
    struct ieee80211_sub_if_data __rcu *sched_scan_sdata;

    unsigned long leave_oper_channel_time;
    enum mac80211_scan_state next_scan_state;
    struct delayed_work scan_work;
    struct ieee80211_sub_if_data __rcu *scan_sdata;
    enum nl80211_channel_type _oper_channel_type;
    struct ieee80211_channel *oper_channel, *csa_channel;

    /* Temporary remain-on-channel for off-channel operations */
    struct ieee80211_channel *tmp_channel;
    enum nl80211_channel_type tmp_channel_type;

    /* SNMP counters */
    /* dot11CountersTable */
    u32 dot11TransmittedFragmentCount;
    u32 dot11MulticastTransmittedFrameCount;
    u32 dot11FailedCount;
    u32 dot11RetryCount;
    u32 dot11MultipleRetryCount;
    u32 dot11FrameDuplicateCount;
    u32 dot11ReceivedFragmentCount;
    u32 dot11MulticastReceivedFrameCount;
    u32 dot11TransmittedFrameCount;

#ifdef CONFIG_MAC80211_LEDS
    int tx_led_counter, rx_led_counter;
    struct led_trigger *tx_led, *rx_led, *assoc_led, *radio_led;
    struct tpt_led_trigger *tpt_led_trigger;
    char tx_led_name[32], rx_led_name[32],
         assoc_led_name[32], radio_led_name[32];
#endif

#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
    /* TX/RX handler statistics */
    unsigned int tx_handlers_drop;
    unsigned int tx_handlers_queued;
    unsigned int tx_handlers_drop_unencrypted;
    unsigned int tx_handlers_drop_fragment;
    unsigned int tx_handlers_drop_wep;
    unsigned int tx_handlers_drop_not_assoc;
    unsigned int tx_handlers_drop_unauth_port;
    unsigned int rx_handlers_drop;
    unsigned int rx_handlers_queued;
    unsigned int rx_handlers_drop_nullfunc;
    unsigned int rx_handlers_drop_defrag;
    unsigned int rx_handlers_drop_short;
    unsigned int tx_expand_skb_head;
    unsigned int tx_expand_skb_head_cloned;
    unsigned int rx_expand_skb_head;
    unsigned int rx_expand_skb_head2;
    unsigned int rx_handlers_fragments;
    unsigned int tx_status_drop;
#define I802_DEBUG_INC(c) (c)++
#else /* CONFIG_MAC80211_DEBUG_COUNTERS */
#define I802_DEBUG_INC(c) do { } while (0)
#endif /* CONFIG_MAC80211_DEBUG_COUNTERS */


    int total_ps_buffered; /* total number of all buffered unicast and
                * multicast packets for power saving stations
                */

    bool pspolling;
    bool offchannel_ps_enabled;
    /*
     * PS can only be enabled when we have exactly one managed
     * interface (and monitors) in PS, this then points there.
     */
    struct ieee80211_sub_if_data *ps_sdata;
    struct work_struct dynamic_ps_enable_work;
    struct work_struct dynamic_ps_disable_work;
    struct timer_list dynamic_ps_timer;
    struct notifier_block network_latency_notifier;
    struct notifier_block ifa_notifier;

    /*
     * The dynamic ps timeout configured from user space via WEXT -
     * this will override whatever chosen by mac80211 internally.
     */
    int dynamic_ps_forced_timeout;
    int dynamic_ps_user_timeout;
    bool disable_dynamic_ps;

    int user_power_level; /* in dBm */
    int ap_power_level; /* in dBm */

    enum ieee80211_smps_mode smps_mode;

    struct work_struct restart_work;

#ifdef CONFIG_MAC80211_DEBUGFS
    struct local_debugfsdentries {
        struct dentry *rcdir;
        struct dentry *keys;
    } debugfs;
#endif

    /*
     * Remain-on-channel support
     */
    struct list_head roc_list;
    struct work_struct hw_roc_start, hw_roc_done;
    unsigned long hw_roc_start_time;

    struct idr ack_status_frames;
    spinlock_t ack_status_lock;

    struct ieee80211_sub_if_data __rcu *p2p_sdata;

    /* dummy netdev for use w/ NAPI */
    struct net_device napi_dev;

    struct napi_struct napi;

    /* virtual monitor interface */
    struct ieee80211_sub_if_data __rcu *monitor_sdata;
};

static inline struct ieee80211_sub_if_data *
IEEE80211_DEV_TO_SUB_IF(struct net_device *dev)
{
    return netdev_priv(dev);
}

static inline struct ieee80211_sub_if_data *
IEEE80211_WDEV_TO_SUB_IF(struct wireless_dev *wdev)
{
    return container_of(wdev, struct ieee80211_sub_if_data, wdev);
}

/* this struct represents 802.11n's RA/TID combination */
struct ieee80211_ra_tid {
    u8 ra[ETH_ALEN];
    u16 tid;
};

/* Parsed Information Elements */
struct ieee802_11_elems {
    u8 *ie_start;
    size_t total_len;

    /* pointers to IEs */
    u8 *ssid;
    u8 *supp_rates;
    u8 *fh_params;
    u8 *ds_params;
    u8 *cf_params;
    struct ieee80211_tim_ie *tim;
    u8 *ibss_params;
    u8 *challenge;
    u8 *wpa;
    u8 *rsn;
    u8 *erp_info;
    u8 *ext_supp_rates;
    u8 *wmm_info;
    u8 *wmm_param;
    struct ieee80211_ht_cap *ht_cap_elem;
    struct ieee80211_ht_operation *ht_operation;
    struct ieee80211_meshconf_ie *mesh_config;
    u8 *mesh_id;
    u8 *peering;
    u8 *preq;
    u8 *prep;
    u8 *perr;
    struct ieee80211_rann_ie *rann;
    struct ieee80211_channel_sw_ie *ch_switch_ie;
    u8 *country_elem;
    u8 *pwr_constr_elem;
    u8 *quiet_elem; /* first quite element */
    u8 *timeout_int;

    /* length of them, respectively */
    u8 ssid_len;
    u8 supp_rates_len;
    u8 fh_params_len;
    u8 ds_params_len;
    u8 cf_params_len;
    u8 tim_len;
    u8 ibss_params_len;
    u8 challenge_len;
    u8 wpa_len;
    u8 rsn_len;
    u8 erp_info_len;
    u8 ext_supp_rates_len;
    u8 wmm_info_len;
    u8 wmm_param_len;
    u8 mesh_id_len;
    u8 peering_len;
    u8 preq_len;
    u8 prep_len;
    u8 perr_len;
    u8 country_elem_len;
    u8 quiet_elem_len;
    u8 num_of_quiet_elem;   /* can be more the one */
    u8 timeout_int_len;

    /* whether a parse error occurred while retrieving these elements */
    bool parse_error;
};

static inline struct ieee80211_local *hw_to_local(
    struct ieee80211_hw *hw)
{
    return container_of(hw, struct ieee80211_local, hw);
}


static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
{
    return ether_addr_equal(raddr, addr) ||
           is_broadcast_ether_addr(raddr);
}


int ieee80211_hw_config(struct ieee80211_local *local, u32 changed);
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx);
void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
                      u32 changed);
void ieee80211_configure_filter(struct ieee80211_local *local);
u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata);

/* STA code */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata);
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
               struct cfg80211_auth_request *req);
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
            struct cfg80211_assoc_request *req);
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
             struct cfg80211_deauth_request *req);
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
               struct cfg80211_disassoc_request *req);
void ieee80211_send_pspoll(struct ieee80211_local *local,
               struct ieee80211_sub_if_data *sdata);
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency);
void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata);
int ieee80211_max_network_latency(struct notifier_block *nb,
                  unsigned long data, void *dummy);
int ieee80211_set_arp_filter(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
                      struct ieee80211_channel_sw_ie *sw_elem,
                      struct ieee80211_bss *bss,
                      u64 timestamp);
void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                  struct sk_buff *skb);
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata);
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata);

/* IBSS code */
void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local);
void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
                  const u8 *bssid, const u8 *addr, u32 supp_rates);
int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
            struct cfg80211_ibss_params *params);
int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                   struct sk_buff *skb);

/* mesh code */
void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata);
void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                   struct sk_buff *skb);

/* scan/BSS handling */
void ieee80211_scan_work(struct work_struct *work);
int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
                    const u8 *ssid, u8 ssid_len,
                    struct ieee80211_channel *chan);
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
               struct cfg80211_scan_request *req);
void ieee80211_scan_cancel(struct ieee80211_local *local);
void ieee80211_run_deferred_scan(struct ieee80211_local *local);
void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb);

void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local);
struct ieee80211_bss *
ieee80211_bss_info_update(struct ieee80211_local *local,
              struct ieee80211_rx_status *rx_status,
              struct ieee80211_mgmt *mgmt,
              size_t len,
              struct ieee802_11_elems *elems,
              struct ieee80211_channel *channel,
              bool beacon);
void ieee80211_rx_bss_put(struct ieee80211_local *local,
              struct ieee80211_bss *bss);

/* scheduled scan handling */
int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
                       struct cfg80211_sched_scan_request *req);
int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata);
void ieee80211_sched_scan_stopped_work(struct work_struct *work);

/* off-channel helpers */
void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
                    bool offchannel_ps_enable);
void ieee80211_offchannel_return(struct ieee80211_local *local,
                 bool offchannel_ps_disable);
void ieee80211_roc_setup(struct ieee80211_local *local);
void ieee80211_start_next_roc(struct ieee80211_local *local);
void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata);
void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc);
void ieee80211_sw_roc_work(struct work_struct *work);
void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc);

/* interface handling */
int ieee80211_iface_init(void);
void ieee80211_iface_exit(void);
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
             struct wireless_dev **new_wdev, enum nl80211_iftype type,
             struct vif_params *params);
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
                 enum nl80211_iftype type);
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata);
void ieee80211_remove_interfaces(struct ieee80211_local *local);
void ieee80211_recalc_idle(struct ieee80211_local *local);
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
                    const int offset);
int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up);
void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata);

static inline bool ieee80211_sdata_running(struct ieee80211_sub_if_data *sdata)
{
    return test_bit(SDATA_STATE_RUNNING, &sdata->state);
}

/* tx handling */
void ieee80211_clear_tx_pending(struct ieee80211_local *local);
void ieee80211_tx_pending(unsigned long data);
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
                     struct net_device *dev);
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
                       struct net_device *dev);
void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
                  struct sk_buff_head *skbs);

/* HT */
void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
                     struct ieee80211_sta_ht_cap *ht_cap);
void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
                       struct ieee80211_supported_band *sband,
                       struct ieee80211_ht_cap *ht_cap_ie,
                       struct ieee80211_sta_ht_cap *ht_cap);
void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
              const u8 *da, u16 tid,
              u16 initiator, u16 reason_code);
int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
                   enum ieee80211_smps_mode smps, const u8 *da,
                   const u8 *bssid);
void ieee80211_request_smps_work(struct work_struct *work);

void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
                     u16 initiator, u16 reason, bool stop);
void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
                    u16 initiator, u16 reason, bool stop);
void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx);
void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
                 struct sta_info *sta,
                 struct ieee80211_mgmt *mgmt, size_t len);
void ieee80211_process_addba_resp(struct ieee80211_local *local,
                  struct sta_info *sta,
                  struct ieee80211_mgmt *mgmt,
                  size_t len);
void ieee80211_process_addba_request(struct ieee80211_local *local,
                     struct sta_info *sta,
                     struct ieee80211_mgmt *mgmt,
                     size_t len);

int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
                   enum ieee80211_back_parties initiator,
                   bool tx);
int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
                    enum ieee80211_back_parties initiator,
                    bool tx);
void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid);
void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid);
void ieee80211_ba_session_work(struct work_struct *work);
void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid);
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid);

/* Spectrum management */
void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
                       struct ieee80211_mgmt *mgmt,
                       size_t len);

/* Suspend/resume and hw reconfiguration */
int ieee80211_reconfig(struct ieee80211_local *local);
void ieee80211_stop_device(struct ieee80211_local *local);

int __ieee80211_suspend(struct ieee80211_hw *hw,
            struct cfg80211_wowlan *wowlan);

static inline int __ieee80211_resume(struct ieee80211_hw *hw)
{
    struct ieee80211_local *local = hw_to_local(hw);

    WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
        "%s: resume with hardware scan still in progress\n",
        wiphy_name(hw->wiphy));

    return ieee80211_reconfig(hw_to_local(hw));
}

/* utility functions/constants */
extern void *mac80211_wiphy_privid; /* for wiphy privid */
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
            enum nl80211_iftype type);
int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
                 int rate, int erp, int short_preamble);
void mac80211_ev_michael_mic_failure(struct ieee80211_sub_if_data *sdata, int keyidx,
                     struct ieee80211_hdr *hdr, const u8 *tsc,
                     gfp_t gfp);
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
                   bool bss_notify);
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb);

void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
              struct sk_buff *skb, int tid);
static void inline ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata,
                    struct sk_buff *skb)
{
    /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
    ieee80211_tx_skb_tid(sdata, skb, 7);
}

void ieee802_11_parse_elems(u8 *start, size_t len,
                struct ieee802_11_elems *elems);
u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
                   struct ieee802_11_elems *elems,
                   u64 filter, u32 crc);
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
                  enum ieee80211_band band);

void ieee80211_dynamic_ps_enable_work(struct work_struct *work);
void ieee80211_dynamic_ps_disable_work(struct work_struct *work);
void ieee80211_dynamic_ps_timer(unsigned long data);
void ieee80211_send_nullfunc(struct ieee80211_local *local,
                 struct ieee80211_sub_if_data *sdata,
                 int powersave);
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
                 struct ieee80211_hdr *hdr);
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
                 struct ieee80211_hdr *hdr, bool ack);

void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
                     enum queue_stop_reason reason);
void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
                     enum queue_stop_reason reason);
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
                    enum queue_stop_reason reason);
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
                    enum queue_stop_reason reason);
void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue);
void ieee80211_add_pending_skb(struct ieee80211_local *local,
                   struct sk_buff *skb);
void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
                   struct sk_buff_head *skbs,
                   void (*fn)(void *data), void *data);
static inline void ieee80211_add_pending_skbs(struct ieee80211_local *local,
                          struct sk_buff_head *skbs)
{
    ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
}

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
             u16 transaction, u16 auth_alg,
             u8 *extra, size_t extra_len, const u8 *bssid,
             const u8 *da, const u8 *key, u8 key_len, u8 key_idx);
void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
                    const u8 *bssid, u16 stype, u16 reason,
                    bool send_frame, u8 *frame_buf);
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
                 const u8 *ie, size_t ie_len,
                 enum ieee80211_band band, u32 rate_mask,
                 u8 channel);
struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
                      u8 *dst, u32 ratemask,
                      struct ieee80211_channel *chan,
                      const u8 *ssid, size_t ssid_len,
                      const u8 *ie, size_t ie_len,
                      bool directed);
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
                  const u8 *ssid, size_t ssid_len,
                  const u8 *ie, size_t ie_len,
                  u32 ratemask, bool directed, bool no_cck,
                  struct ieee80211_channel *channel);

void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
                  const size_t supp_rates_len,
                  const u8 *supp_rates);
u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
                struct ieee802_11_elems *elems,
                enum ieee80211_band band, u32 *basic_rates);
int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata,
                 enum ieee80211_smps_mode smps_mode);
void ieee80211_recalc_smps(struct ieee80211_local *local);

size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
              const u8 *ids, int n_ids, size_t offset);
size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset);
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
                  u16 cap);
u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
                   struct ieee80211_channel *channel,
                   enum nl80211_channel_type channel_type,
                   u16 prot_mode);
u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
                   u32 cap);
int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
                struct sk_buff *skb, bool need_basic,
                enum ieee80211_band band);
int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
                struct sk_buff *skb, bool need_basic,
                enum ieee80211_band band);

/* channel management */
enum ieee80211_chan_mode {
    CHAN_MODE_UNDEFINED,
    CHAN_MODE_HOPPING,
    CHAN_MODE_FIXED,
};

enum ieee80211_chan_mode
ieee80211_get_channel_mode(struct ieee80211_local *local,
               struct ieee80211_sub_if_data *ignore);
bool ieee80211_set_channel_type(struct ieee80211_local *local,
                struct ieee80211_sub_if_data *sdata,
                enum nl80211_channel_type chantype);
enum nl80211_channel_type
ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper);

#ifdef CONFIG_MAC80211_NOINLINE
#define debug_noinline noinline
#else
#define debug_noinline
#endif

#endif /* IEEE80211_I_H */