/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 *
 * 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 <linux/rhashtable.h>
#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <net/fq.h>
#include "key.h"
#include "sta_info.h"
#include "debug.h"

extern const struct cfg80211_ops mac80211_config_ops;

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

/* power level hasn't been configured (or set to automatic) */
#define IEEE80211_UNSET_POWER_LEVEL     INT_MIN

/*
 * Some APs experience problems when working with U-APSD. Decreasing the
 * probability of that happening by using legacy mode for all ACs but VO isn't
 * enough.
 *
 * Cisco 4410N originally forced us to enable VO by default only because it
 * treated non-VO ACs as legacy.
 *
 * However some APs (notably Netgear R7000) silently reclassify packets to
 * different ACs. Since u-APSD ACs require trigger frames for frame retrieval
 * clients would never see some frames (e.g. ARP responses) or would fetch them
 * accidentally after a long time.
 *
 * It makes little sense to enable u-APSD queues by default because it needs
 * userspace applications to be aware of it to actually take advantage of the
 * possible additional powersavings. Implicitly depending on driver autotrigger
 * frame support doesn't make much sense.
 */
#define IEEE80211_DEFAULT_UAPSD_QUEUES 0

#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 {
        struct sk_buff_head skb_list;
        unsigned long first_frag_time;
        u16 seq;
        u16 extra_len;
        u16 last_frag;
        u8 rx_queue;
        bool check_sequential_pn; /* needed for CCMP/GCMP */
        u8 last_pn[6]; /* PN of the last fragment if CCMP was used */
};


struct ieee80211_bss {
        u32 device_ts_beacon, device_ts_presp;

        bool wmm_used;
        bool uapsd_supported;

#define IEEE80211_MAX_SUPP_RATES 32
        u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
        size_t supp_rates_len;
        struct ieee80211_rate *beacon_rate;

        /*
         * 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_corrupt_data_flags - BSS data corruption flags
 * @IEEE80211_BSS_CORRUPT_BEACON: last beacon frame received was corrupted
 * @IEEE80211_BSS_CORRUPT_PROBE_RESP: last probe response received was corrupted
 *
 * These are bss flags that are attached to a bss in the
 * @corrupt_data field of &struct ieee80211_bss.
 */
enum ieee80211_bss_corrupt_data_flags {
        IEEE80211_BSS_CORRUPT_BEACON            = BIT(0),
        IEEE80211_BSS_CORRUPT_PROBE_RESP        = BIT(1)
};

/**
 * enum ieee80211_valid_data_flags - BSS valid data flags
 * @IEEE80211_BSS_VALID_WMM: WMM/UAPSD data was gathered from non-corrupt IE
 * @IEEE80211_BSS_VALID_RATES: Supported rates were gathered from non-corrupt IE
 * @IEEE80211_BSS_VALID_ERP: ERP flag was gathered from non-corrupt IE
 *
 * These are bss flags that are attached to a bss in the
 * @valid_data field of &struct ieee80211_bss.  They show which parts
 * of the data structure were received as a result of an un-corrupted
 * beacon/probe response.
 */
enum ieee80211_bss_valid_data_flags {
        IEEE80211_BSS_VALID_WMM                 = BIT(1),
        IEEE80211_BSS_VALID_RATES               = BIT(2),
        IEEE80211_BSS_VALID_ERP                 = BIT(3)
};

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;
        struct ieee80211_tx_rate rate;

        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 - packet RX flags
 * @IEEE80211_RX_AMSDU: a-MSDU packet
 * @IEEE80211_RX_MALFORMED_ACTION_FRM: action frame is malformed
 * @IEEE80211_RX_DEFERRED_RELEASE: frame was subjected to receive reordering
 *
 * These are per-frame flags that are attached to a frame in the
 * @rx_flags field of &struct ieee80211_rx_status.
 */
enum ieee80211_packet_rx_flags {
        IEEE80211_RX_AMSDU                      = BIT(3),
        IEEE80211_RX_MALFORMED_ACTION_FRM       = BIT(4),
        IEEE80211_RX_DEFERRED_RELEASE           = BIT(5),
};

/**
 * enum ieee80211_rx_flags - RX data flags
 *
 * @IEEE80211_RX_CMNTR: received on cooked monitor already
 * @IEEE80211_RX_BEACON_REPORTED: This frame was already reported
 *      to cfg80211_report_obss_beacon().
 *
 * These flags are used across handling multiple interfaces
 * for a single frame.
 */
enum ieee80211_rx_flags {
        IEEE80211_RX_CMNTR              = BIT(0),
        IEEE80211_RX_BEACON_REPORTED    = BIT(1),
};

struct ieee80211_rx_data {
        struct napi_struct *napi;
        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 ieee80211_csa_settings {
        const u16 *counter_offsets_beacon;
        const u16 *counter_offsets_presp;

        int n_counter_offsets_beacon;
        int n_counter_offsets_presp;

        u8 count;
};

struct beacon_data {
        u8 *head, *tail;
        int head_len, tail_len;
        struct ieee80211_meshconf_ie *meshconf;
        u16 csa_counter_offsets[IEEE80211_MAX_CSA_COUNTERS_NUM];
        u8 csa_current_counter;
        struct rcu_head rcu_head;
};

struct probe_resp {
        struct rcu_head rcu_head;
        int len;
        u16 csa_counter_offsets[IEEE80211_MAX_CSA_COUNTERS_NUM];
        u8 data[0];
};

struct ps_data {
        /* 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)]
                        __aligned(__alignof__(unsigned long));
        struct sk_buff_head bc_buf;
        atomic_t num_sta_ps; /* number of stations in PS mode */
        int dtim_count;
        bool dtim_bc_mc;
};

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

        /* to be used after channel switch. */
        struct cfg80211_beacon_data *next_beacon;
        struct list_head vlans; /* write-protected with RTNL and local->mtx */

        struct ps_data ps;
        atomic_t num_mcast_sta; /* number of stations receiving multicast */
        enum ieee80211_smps_mode req_smps, /* requested smps mode */
                         driver_smps_mode; /* smps mode request */

        struct work_struct request_smps_work;
};

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

struct ieee80211_if_vlan {
        struct list_head list; /* write-protected with RTNL and local->mtx */

        /* 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 */
};

#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;
};

struct ieee80211_roc_work {
        struct list_head list;

        struct ieee80211_sub_if_data *sdata;

        struct ieee80211_channel *chan;

        bool started, abort, hw_begun, notified;
        bool on_channel;

        unsigned long start_time;

        u32 duration, req_duration;
        struct sk_buff *frame;
        u64 cookie, mgmt_tx_cookie;
        enum ieee80211_roc_type type;
};

/* flags used in struct ieee80211_if_managed.flags */
enum ieee80211_sta_flags {
        IEEE80211_STA_CONNECTION_POLL   = BIT(1),
        IEEE80211_STA_CONTROL_PORT      = BIT(2),
        IEEE80211_STA_DISABLE_HT        = BIT(4),
        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),
        IEEE80211_STA_DISABLE_80P80MHZ  = BIT(12),
        IEEE80211_STA_DISABLE_160MHZ    = BIT(13),
        IEEE80211_STA_DISABLE_WMM       = BIT(14),
        IEEE80211_STA_ENABLE_RRM        = BIT(15),
};

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;
        bool timeout_started;

        u16 sae_trans, sae_status;
        size_t data_len;
        u8 data[];
};

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 need_beacon;
        bool synced;
        bool timeout_started;

        u8 ap_ht_param;

        struct ieee80211_vht_cap ap_vht_cap;

        size_t ie_len;
        u8 ie[];
};

struct ieee80211_sta_tx_tspec {
        /* timestamp of the first packet in the time slice */
        unsigned long time_slice_start;

        u32 admitted_time; /* in usecs, unlike over the air */
        u8 tsid;
        s8 up; /* signed to be able to invalidate with -1 during teardown */

        /* consumed TX time in microseconds in the time slice */
        u32 consumed_tx_time;
        enum {
                TX_TSPEC_ACTION_NONE = 0,
                TX_TSPEC_ACTION_DOWNGRADE,
                TX_TSPEC_ACTION_STOP_DOWNGRADE,
        } action;
        bool downgraded;
};

DECLARE_EWMA(beacon_signal, 16, 4)

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;
        bool connection_loss;

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

        u8 bssid[ETH_ALEN];

        u16 aid;

        bool powersave; /* powersave requested for this iface */
        bool broken_ap; /* AP is broken -- turn off powersave */
        bool have_beacon;
        u8 dtim_period;
        enum ieee80211_smps_mode req_smps, /* requested smps mode */
                                 driver_smps_mode; /* smps mode request */

        struct work_struct request_smps_work;

        unsigned int flags;

        bool csa_waiting_bcn;
        bool csa_ignored_same_chan;

        bool beacon_crc_valid;
        u32 beacon_crc;

        bool status_acked;
        bool status_received;
        __le16 status_fc;

        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;

        s16 p2p_noa_index;

        struct ewma_beacon_signal 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;

        /* Number of times beacon loss was invoked. */
        unsigned int beacon_loss_count;

        /*
         * 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_vht_cap vht_capa; /* configured VHT overrides */
        struct ieee80211_vht_cap vht_capa_mask; /* Valid parts of vht_capa */

        /* TDLS support */
        u8 tdls_peer[ETH_ALEN] __aligned(2);
        struct delayed_work tdls_peer_del_work;
        struct sk_buff *orig_teardown_skb; /* The original teardown skb */
        struct sk_buff *teardown_skb; /* A copy to send through the AP */
        spinlock_t teardown_lock; /* To lock changing teardown_skb */
        bool tdls_chan_switch_prohibited;
        bool tdls_wider_bw_prohibited;

        /* WMM-AC TSPEC support */
        struct ieee80211_sta_tx_tspec tx_tspec[IEEE80211_NUM_ACS];
        /* Use a separate work struct so that we can do something here
         * while the sdata->work is flushing the queues, for example.
         * otherwise, in scenarios where we hardly get any traffic out
         * on the BE queue, but there's a lot of VO traffic, we might
         * get stuck in a downgraded situation and flush takes forever.
         */
        struct delayed_work tx_tspec_wk;
};

struct ieee80211_if_ibss {
        struct timer_list timer;
        struct work_struct csa_connection_drop_work;

        unsigned long last_scan_completed;

        u32 basic_rates;

        bool fixed_bssid;
        bool fixed_channel;
        bool privacy;

        bool control_port;
        bool userspace_handles_dfs;

        u8 bssid[ETH_ALEN] __aligned(2);
        u8 ssid[IEEE80211_MAX_SSID_LEN];
        u8 ssid_len, ie_len;
        u8 *ie;
        struct cfg80211_chan_def chandef;

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

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

        spinlock_t incomplete_lock;
        struct list_head incomplete_stations;

        enum {
                IEEE80211_IBSS_MLME_SEARCH,
                IEEE80211_IBSS_MLME_JOINED,
        } state;
};

/**
 * struct ieee80211_if_ocb - OCB mode state
 *
 * @housekeeping_timer: timer for periodic invocation of a housekeeping task
 * @wrkq_flags: OCB deferred task action
 * @incomplete_lock: delayed STA insertion lock
 * @incomplete_stations: list of STAs waiting for delayed insertion
 * @joined: indication if the interface is connected to an OCB network
 */
struct ieee80211_if_ocb {
        struct timer_list housekeeping_timer;
        unsigned long wrkq_flags;

        spinlock_t incomplete_lock;
        struct list_head incomplete_stations;

        bool joined;
};

/**
 * struct ieee80211_mesh_sync_ops - Extensible synchronization framework interface
 *
 * these declarations define the interface, which enables
 * vendor-specific mesh synchronization
 *
 */
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);

        /* should be called with beacon_data under RCU read lock */
        void (*adjust_tbtt)(struct ieee80211_sub_if_data *sdata,
                            struct beacon_data *beacon);
        /* add other framework functions here */
};

struct mesh_csa_settings {
        struct rcu_head rcu_head;
        struct cfg80211_csa_settings settings;
};

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

        unsigned long wrkq_flags;
        unsigned long mbss_changed;

        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;
        atomic_t estab_plinks;
        u32 mesh_seqnum;
        bool accepting_plinks;
        int num_gates;
        struct beacon_data __rcu *beacon;
        const u8 *ie;
        u8 ie_len;
        enum {
                IEEE80211_MESH_SEC_NONE = 0x0,
                IEEE80211_MESH_SEC_AUTHED = 0x1,
                IEEE80211_MESH_SEC_SECURED = 0x2,
        } security;
        bool user_mpm;
        /* Extensible Synchronization Framework */
        const struct ieee80211_mesh_sync_ops *sync_ops;
        s64 sync_offset_clockdrift_max;
        spinlock_t sync_offset_lock;
        bool adjusting_tbtt;
        /* mesh power save */
        enum nl80211_mesh_power_mode nonpeer_pm;
        int ps_peers_light_sleep;
        int ps_peers_deep_sleep;
        struct ps_data ps;
        /* Channel Switching Support */
        struct mesh_csa_settings __rcu *csa;
        enum {
                IEEE80211_MESH_CSA_ROLE_NONE,
                IEEE80211_MESH_CSA_ROLE_INIT,
                IEEE80211_MESH_CSA_ROLE_REPEATER,
        } csa_role;
        u8 chsw_ttl;
        u16 pre_value;

        /* offset from skb->data while building IE */
        int meshconf_offset;

        struct mesh_table *mesh_paths;
        struct mesh_table *mpp_paths; /* Store paths for MPP&MAP */
        int mesh_paths_generation;
        int mpp_paths_generation;
};

#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 - virtual interface flags
 *
 * @IEEE80211_SDATA_ALLMULTI: interface wants all multicast packets
 * @IEEE80211_SDATA_OPERATING_GMODE: operating in G-only mode
 * @IEEE80211_SDATA_DONT_BRIDGE_PACKETS: bridge packets between
 *      associated stations and deliver multicast frames both
 *      back to wireless media and to the local net stack.
 * @IEEE80211_SDATA_DISCONNECT_RESUME: Disconnect after resume.
 * @IEEE80211_SDATA_IN_DRIVER: indicates interface was added to driver
 */
enum ieee80211_sub_if_data_flags {
        IEEE80211_SDATA_ALLMULTI                = BIT(0),
        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 - virtual interface state bits
 * @SDATA_STATE_RUNNING: virtual interface is up & running; this
 *      mirrors netif_running() but is separate for interface type
 *      change handling while the interface is up
 * @SDATA_STATE_OFFCHANNEL: This interface is currently in offchannel
 *      mode, so queues are stopped
 * @SDATA_STATE_OFFCHANNEL_BEACON_STOPPED: Beaconing was stopped due
 *      to offchannel, reset when offchannel returns
 */
enum ieee80211_sdata_state_bits {
        SDATA_STATE_RUNNING,
        SDATA_STATE_OFFCHANNEL,
        SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
};

/**
 * enum ieee80211_chanctx_mode - channel context configuration mode
 *
 * @IEEE80211_CHANCTX_SHARED: channel context may be used by
 *      multiple interfaces
 * @IEEE80211_CHANCTX_EXCLUSIVE: channel context can be used
 *      only by a single interface. This can be used for example for
 *      non-fixed channel IBSS.
 */
enum ieee80211_chanctx_mode {
        IEEE80211_CHANCTX_SHARED,
        IEEE80211_CHANCTX_EXCLUSIVE
};

/**
 * enum ieee80211_chanctx_replace_state - channel context replacement state
 *
 * This is used for channel context in-place reservations that require channel
 * context switch/swap.
 *
 * @IEEE80211_CHANCTX_REPLACE_NONE: no replacement is taking place
 * @IEEE80211_CHANCTX_WILL_BE_REPLACED: this channel context will be replaced
 *      by a (not yet registered) channel context pointed by %replace_ctx.
 * @IEEE80211_CHANCTX_REPLACES_OTHER: this (not yet registered) channel context
 *      replaces an existing channel context pointed to by %replace_ctx.
 */
enum ieee80211_chanctx_replace_state {
        IEEE80211_CHANCTX_REPLACE_NONE,
        IEEE80211_CHANCTX_WILL_BE_REPLACED,
        IEEE80211_CHANCTX_REPLACES_OTHER,
};

struct ieee80211_chanctx {
        struct list_head list;
        struct rcu_head rcu_head;

        struct list_head assigned_vifs;
        struct list_head reserved_vifs;

        enum ieee80211_chanctx_replace_state replace_state;
        struct ieee80211_chanctx *replace_ctx;

        enum ieee80211_chanctx_mode mode;
        bool driver_present;

        struct ieee80211_chanctx_conf conf;
};

struct mac80211_qos_map {
        struct cfg80211_qos_map qos_map;
        struct rcu_head rcu_head;
};

enum txq_info_flags {
        IEEE80211_TXQ_STOP,
        IEEE80211_TXQ_AMPDU,
        IEEE80211_TXQ_NO_AMSDU,
};

/**
 * struct txq_info - per tid queue
 *
 * @tin: contains packets split into multiple flows
 * @def_flow: used as a fallback flow when a packet destined to @tin hashes to
 *      a fq_flow which is already owned by a different tin
 * @def_cvars: codel vars for @def_flow
 */
struct txq_info {
        struct fq_tin tin;
        struct fq_flow def_flow;
        struct codel_vars def_cvars;
        unsigned long flags;

        /* keep last! */
        struct ieee80211_txq txq;
};

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;
        int crypto_tx_tailroom_pending_dec;
        struct delayed_work dec_tailroom_needed_wk;

        struct net_device *dev;
        struct ieee80211_local *local;

        unsigned int flags;

        unsigned long state;

        char name[IFNAMSIZ];

        /* 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;
        int encrypt_headroom;

        atomic_t num_tx_queued;
        struct ieee80211_tx_queue_params tx_conf[IEEE80211_NUM_ACS];
        struct mac80211_qos_map __rcu *qos_map;

        struct work_struct csa_finalize_work;
        bool csa_block_tx; /* write-protected by sdata_lock and local->mtx */
        struct cfg80211_chan_def csa_chandef;

        struct list_head assigned_chanctx_list; /* protected by chanctx_mtx */
        struct list_head reserved_chanctx_list; /* protected by chanctx_mtx */

        /* context reservation -- protected with chanctx_mtx */
        struct ieee80211_chanctx *reserved_chanctx;
        struct cfg80211_chan_def reserved_chandef;
        bool reserved_radar_required;
        bool reserved_ready;

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

        struct work_struct work;
        struct sk_buff_head skb_queue;

        u8 needed_rx_chains;
        enum ieee80211_smps_mode smps_mode;

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

        bool radar_required;
        struct delayed_work dfs_cac_timer_work;

        /*
         * 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[NUM_NL80211_BANDS];

        bool rc_has_mcs_mask[NUM_NL80211_BANDS];
        u8  rc_rateidx_mcs_mask[NUM_NL80211_BANDS][IEEE80211_HT_MCS_MASK_LEN];

        bool rc_has_vht_mcs_mask[NUM_NL80211_BANDS];
        u16 rc_rateidx_vht_mcs_mask[NUM_NL80211_BANDS][NL80211_VHT_NSS_MAX];

        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;
                struct ieee80211_if_ocb ocb;
                u32 mntr_flags;
        } u;

#ifdef CONFIG_MAC80211_DEBUGFS
        struct {
                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);
}

static inline void sdata_lock(struct ieee80211_sub_if_data *sdata)
        __acquires(&sdata->wdev.mtx)
{
        mutex_lock(&sdata->wdev.mtx);
        __acquire(&sdata->wdev.mtx);
}

static inline void sdata_unlock(struct ieee80211_sub_if_data *sdata)
        __releases(&sdata->wdev.mtx)
{
        mutex_unlock(&sdata->wdev.mtx);
        __release(&sdata->wdev.mtx);
}

#define sdata_dereference(p, sdata) \
        rcu_dereference_protected(p, lockdep_is_held(&sdata->wdev.mtx))

static inline void
sdata_assert_lock(struct ieee80211_sub_if_data *sdata)
{
        lockdep_assert_held(&sdata->wdev.mtx);
}

static inline enum nl80211_band
ieee80211_get_sdata_band(struct ieee80211_sub_if_data *sdata)
{
        enum nl80211_band band = NL80211_BAND_2GHZ;
        struct ieee80211_chanctx_conf *chanctx_conf;

        rcu_read_lock();
        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
        if (!WARN_ON(!chanctx_conf))
                band = chanctx_conf->def.chan->band;
        rcu_read_unlock();

        return band;
}

static inline int
ieee80211_chandef_get_shift(struct cfg80211_chan_def *chandef)
{
        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_5:
                return 2;
        case NL80211_CHAN_WIDTH_10:
                return 1;
        default:
                return 0;
        }
}

static inline int
ieee80211_vif_get_shift(struct ieee80211_vif *vif)
{

        struct ieee80211_chanctx_conf *chanctx_conf;
        int shift = 0;

        rcu_read_lock();
        chanctx_conf = rcu_dereference(vif->chanctx_conf);
        if (chanctx_conf)
                shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
        rcu_read_unlock();

        return shift;
}

struct ieee80211_rx_agg {
        u8 addr[ETH_ALEN];
        u16 tid;
};

enum sdata_queue_type {
        IEEE80211_SDATA_QUEUE_TYPE_FRAME        = 0,
        IEEE80211_SDATA_QUEUE_AGG_START         = 1,
        IEEE80211_SDATA_QUEUE_AGG_STOP          = 2,
        IEEE80211_SDATA_QUEUE_RX_AGG_START      = 3,
        IEEE80211_SDATA_QUEUE_RX_AGG_STOP       = 4,
};

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

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,
        IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,
        IEEE80211_QUEUE_STOP_REASON_FLUSH,
        IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN,
        IEEE80211_QUEUE_STOP_REASON_RESERVE_TID,

        IEEE80211_QUEUE_STOP_REASONS,
};

#ifdef CONFIG_MAC80211_LEDS
struct tpt_led_trigger {
        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

/**
 * mac80211 scan flags - currently active scan mode
 *
 * @SCAN_SW_SCANNING: We're currently in the process of scanning but may as
 *      well be on the operating channel
 * @SCAN_HW_SCANNING: The hardware is scanning for us, we have no way to
 *      determine if we are on the operating channel or not
 * @SCAN_ONCHANNEL_SCANNING:  Do a software scan on only the current operating
 *      channel. This should not interrupt normal traffic.
 * @SCAN_COMPLETED: Set for our scan work function when the driver reported
 *      that the scan completed.
 * @SCAN_ABORTED: Set for our scan work function when the driver reported
 *      a scan complete for an aborted scan.
 * @SCAN_HW_CANCELLED: Set for our scan work function when the scan is being
 *      cancelled.
 */
enum {
        SCAN_SW_SCANNING,
        SCAN_HW_SCANNING,
        SCAN_ONCHANNEL_SCANNING,
        SCAN_COMPLETED,
        SCAN_ABORTED,
        SCAN_HW_CANCELLED,
};

/**
 * enum mac80211_scan_state - scan state machine states
 *
 * @SCAN_DECISION: Main entry point to the scan state machine, this state
 *      determines if we should keep on scanning or switch back to the
 *      operating channel
 * @SCAN_SET_CHANNEL: Set the next channel to be scanned
 * @SCAN_SEND_PROBE: Send probe requests and wait for probe responses
 * @SCAN_SUSPEND: Suspend the scan and go back to operating channel to
 *      send out data
 * @SCAN_RESUME: Resume the scan and scan the next channel
 * @SCAN_ABORT: Abort the scan and go back to operating channel
 */
enum mac80211_scan_state {
        SCAN_DECISION,
        SCAN_SET_CHANNEL,
        SCAN_SEND_PROBE,
        SCAN_SUSPEND,
        SCAN_RESUME,
        SCAN_ABORT,
};

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;

        struct fq fq;
        struct codel_vars *cvars;
        struct codel_params cparams;
        struct codel_stats cstats;

        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];
        int q_stop_reasons[IEEE80211_MAX_QUEUES][IEEE80211_QUEUE_STOP_REASONS];
        /* 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;

        bool use_chanctx;

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

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

        /* 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;

        struct work_struct radar_detected_work;

        /* number of RX chains the hardware has */
        u8 rx_chains;

        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;

        spinlock_t rx_path_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 rhashtable sta_hash;
        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 allmulti RX */
        atomic_t iff_allmultis;

        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 __rcu *scan_req;
        struct ieee80211_scan_request *hw_scan_req;
        struct cfg80211_chan_def scan_chandef;
        enum nl80211_band hw_scan_band;
        int scan_channel_idx;
        int scan_ies_len;
        int hw_scan_ies_bufsize;
        struct cfg80211_scan_info scan_info;

        struct work_struct sched_scan_stopped_work;
        struct ieee80211_sub_if_data __rcu *sched_scan_sdata;
        struct cfg80211_sched_scan_request __rcu *sched_scan_req;
        u8 scan_addr[ETH_ALEN];

        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;
        /* For backward compatibility only -- do not use */
        struct cfg80211_chan_def _oper_chandef;

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

        /* channel contexts */
        struct list_head chanctx_list;
        struct mutex chanctx_mtx;

#ifdef CONFIG_MAC80211_LEDS
        struct led_trigger tx_led, rx_led, assoc_led, radio_led;
        struct led_trigger tpt_led;
        atomic_t tx_led_active, rx_led_active, assoc_led_active;
        atomic_t radio_led_active, tpt_led_active;
        struct tpt_led_trigger *tpt_led_trigger;
#endif

#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
        /* SNMP counters */
        /* dot11CountersTable */
        u32 dot11TransmittedFragmentCount;
        u32 dot11MulticastTransmittedFrameCount;
        u32 dot11FailedCount;
        u32 dot11RetryCount;
        u32 dot11MultipleRetryCount;
        u32 dot11FrameDuplicateCount;
        u32 dot11ReceivedFragmentCount;
        u32 dot11MulticastReceivedFrameCount;
        u32 dot11TransmittedFrameCount;

        /* TX/RX handler statistics */
        unsigned int tx_handlers_drop;
        unsigned int tx_handlers_queued;
        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 tx_expand_skb_head;
        unsigned int tx_expand_skb_head_cloned;
        unsigned int rx_expand_skb_head_defrag;
        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 ifa_notifier;
        struct notifier_block ifa6_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 user_power_level; /* in dBm, for all interfaces */

        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 delayed_work roc_work;
        struct list_head roc_list;
        struct work_struct hw_roc_start, hw_roc_done;
        unsigned long hw_roc_start_time;
        u64 roc_cookie_counter;

        struct idr ack_status_frames;
        spinlock_t ack_status_lock;

        struct ieee80211_sub_if_data __rcu *p2p_sdata;

        /* virtual monitor interface */
        struct ieee80211_sub_if_data __rcu *monitor_sdata;
        struct cfg80211_chan_def monitor_chandef;

        /* extended capabilities provided by mac80211 */
        u8 ext_capa[8];

        /* TDLS channel switch */
        struct work_struct tdls_chsw_work;
        struct sk_buff_head skb_queue_tdls_chsw;
};

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;
};

/* this struct holds the value parsing from channel switch IE  */
struct ieee80211_csa_ie {
        struct cfg80211_chan_def chandef;
        u8 mode;
        u8 count;
        u8 ttl;
        u16 pre_value;
};

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

        /* pointers to IEs */
        const struct ieee80211_tdls_lnkie *lnk_id;
        const struct ieee80211_ch_switch_timing *ch_sw_timing;
        const u8 *ext_capab;
        const u8 *ssid;
        const u8 *supp_rates;
        const u8 *ds_params;
        const struct ieee80211_tim_ie *tim;
        const u8 *challenge;
        const u8 *rsn;
        const u8 *erp_info;
        const u8 *ext_supp_rates;
        const u8 *wmm_info;
        const u8 *wmm_param;
        const struct ieee80211_ht_cap *ht_cap_elem;
        const struct ieee80211_ht_operation *ht_operation;
        const struct ieee80211_vht_cap *vht_cap_elem;
        const struct ieee80211_vht_operation *vht_operation;
        const struct ieee80211_meshconf_ie *mesh_config;
        const u8 *mesh_id;
        const u8 *peering;
        const __le16 *awake_window;
        const u8 *preq;
        const u8 *prep;
        const u8 *perr;
        const struct ieee80211_rann_ie *rann;
        const struct ieee80211_channel_sw_ie *ch_switch_ie;
        const struct ieee80211_ext_chansw_ie *ext_chansw_ie;
        const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
        const u8 *country_elem;
        const u8 *pwr_constr_elem;
        const u8 *cisco_dtpc_elem;
        const struct ieee80211_timeout_interval_ie *timeout_int;
        const u8 *opmode_notif;
        const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
        const struct ieee80211_mesh_chansw_params_ie *mesh_chansw_params_ie;

        /* length of them, respectively */
        u8 ext_capab_len;
        u8 ssid_len;
        u8 supp_rates_len;
        u8 tim_len;
        u8 challenge_len;
        u8 rsn_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;

        /* 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 struct txq_info *to_txq_info(struct ieee80211_txq *txq)
{
        return container_of(txq, struct txq_info, txq);
}

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

static inline bool
ieee80211_have_rx_timestamp(struct ieee80211_rx_status *status)
{
        WARN_ON_ONCE(status->flag & RX_FLAG_MACTIME_START &&
                     status->flag & RX_FLAG_MACTIME_END);
        if (status->flag & (RX_FLAG_MACTIME_START | RX_FLAG_MACTIME_END))
                return true;
        /* can't handle HT/VHT preamble yet */
        if (status->flag & RX_FLAG_MACTIME_PLCP_START &&
            !(status->flag & (RX_FLAG_HT | RX_FLAG_VHT)))
                return true;
        return false;
}

u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
                                     struct ieee80211_rx_status *status,
                                     unsigned int mpdu_len,
                                     unsigned int mpdu_offset);
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);

u64 ieee80211_mgmt_tx_cookie(struct ieee80211_local *local);
int ieee80211_attach_ack_skb(struct ieee80211_local *local, struct sk_buff *skb,
                             u64 *cookie, gfp_t gfp);

void ieee80211_check_fast_rx(struct sta_info *sta);
void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata);
void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata);
void ieee80211_clear_fast_rx(struct sta_info *sta);

/* 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);
void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata);
int ieee80211_set_arp_filter(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);
void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
                                  __le16 fc, bool acked);
void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_handle_tspec_ac_params(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_work(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                                   struct sk_buff *skb);
int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
                              struct cfg80211_csa_settings *csa_settings);
int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata);
void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata);

/* OCB code */
void ieee80211_ocb_work(struct ieee80211_sub_if_data *sdata);
void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata,
                             const u8 *bssid, const u8 *addr, u32 supp_rates);
void ieee80211_ocb_setup_sdata(struct ieee80211_sub_if_data *sdata);
int ieee80211_ocb_join(struct ieee80211_sub_if_data *sdata,
                       struct ocb_setup *setup);
int ieee80211_ocb_leave(struct ieee80211_sub_if_data *sdata);

/* 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);
int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
                              struct cfg80211_csa_settings *csa_settings);
int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata);

/* scan/BSS handling */
void ieee80211_scan_work(struct work_struct *work);
int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
                                const u8 *ssid, u8 ssid_len,
                                struct ieee80211_channel **channels,
                                unsigned int n_channels,
                                enum nl80211_bss_scan_width scan_width);
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);
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_start(struct ieee80211_sub_if_data *sdata,
                                       struct cfg80211_sched_scan_request *req);
int ieee80211_request_sched_scan_stop(struct ieee80211_local *local);
void ieee80211_sched_scan_end(struct ieee80211_local *local);
void ieee80211_sched_scan_stopped_work(struct work_struct *work);

/* off-channel/mgmt-tx */
void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local);
void ieee80211_offchannel_return(struct ieee80211_local *local);
void ieee80211_roc_setup(struct ieee80211_local *local);
void ieee80211_start_next_roc(struct ieee80211_local *local);
void ieee80211_roc_purge(struct ieee80211_local *local,
                         struct ieee80211_sub_if_data *sdata);
int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev,
                                struct ieee80211_channel *chan,
                                unsigned int duration, u64 *cookie);
int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy,
                                       struct wireless_dev *wdev, u64 cookie);
int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
                      struct cfg80211_mgmt_tx_params *params, u64 *cookie);
int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy,
                                  struct wireless_dev *wdev, u64 cookie);

/* channel switch handling */
void ieee80211_csa_finalize_work(struct work_struct *work);
int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
                             struct cfg80211_csa_settings *params);

/* interface handling */
int ieee80211_iface_init(void);
void ieee80211_iface_exit(void);
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
                     unsigned char name_assign_type,
                     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);
u32 ieee80211_idle_off(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);
int ieee80211_add_virtual_monitor(struct ieee80211_local *local);
void ieee80211_del_virtual_monitor(struct ieee80211_local *local);

bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata);
void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
                              bool update_bss);

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_subif_start_xmit(struct sk_buff *skb,
                                  struct net_device *dev,
                                  u32 info_flags);
void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
                              struct sk_buff_head *skbs);
struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
                              struct sk_buff *skb, u32 info_flags);
void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
                          struct ieee80211_supported_band *sband,
                          int retry_count, int shift, bool send_to_cooked);

void ieee80211_check_fast_xmit(struct sta_info *sta);
void ieee80211_check_fast_xmit_all(struct ieee80211_local *local);
void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata);
void ieee80211_clear_fast_xmit(struct sta_info *sta);

/* HT */
void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_sta_ht_cap *ht_cap);
bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
                                       struct ieee80211_supported_band *sband,
                                       const struct ieee80211_ht_cap *ht_cap_ie,
                                       struct sta_info *sta);
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_ap_work(struct work_struct *work);
void ieee80211_request_smps_mgd_work(struct work_struct *work);
bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
                                   enum ieee80211_smps_mode smps_mode_new);

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_start_rx_ba_session(struct sta_info *sta,
                                     u8 dialog_token, u16 timeout,
                                     u16 start_seq_num, u16 ba_policy, u16 tid,
                                     u16 buf_size, bool tx, bool auto_seq);
void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
                                         enum ieee80211_agg_stop_reason reason);
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_agg_stop_reason reason);
int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
                                    enum ieee80211_agg_stop_reason reason);
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);

u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs);

/* VHT */
void
ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_supported_band *sband,
                                    const struct ieee80211_vht_cap *vht_cap_ie,
                                    struct sta_info *sta);
enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta);
enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta);
void ieee80211_sta_set_rx_nss(struct sta_info *sta);
enum ieee80211_sta_rx_bandwidth
ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width);
enum nl80211_chan_width ieee80211_sta_cap_chan_bw(struct sta_info *sta);
void ieee80211_sta_set_rx_nss(struct sta_info *sta);
void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
                                 struct ieee80211_mgmt *mgmt);
u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                  struct sta_info *sta, u8 opmode,
                                  enum nl80211_band band);
void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                 struct sta_info *sta, u8 opmode,
                                 enum nl80211_band band);
void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_sta_vht_cap *vht_cap);
void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
                                     u16 vht_mask[NL80211_VHT_NSS_MAX]);

/* Spectrum management */
void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
                                       struct ieee80211_mgmt *mgmt,
                                       size_t len);
/**
 * ieee80211_parse_ch_switch_ie - parses channel switch IEs
 * @sdata: the sdata of the interface which has received the frame
 * @elems: parsed 802.11 elements received with the frame
 * @current_band: indicates the current band
 * @sta_flags: contains information about own capabilities and restrictions
 *      to decide which channel switch announcements can be accepted. Only the
 *      following subset of &enum ieee80211_sta_flags are evaluated:
 *      %IEEE80211_STA_DISABLE_HT, %IEEE80211_STA_DISABLE_VHT,
 *      %IEEE80211_STA_DISABLE_40MHZ, %IEEE80211_STA_DISABLE_80P80MHZ,
 *      %IEEE80211_STA_DISABLE_160MHZ.
 * @bssid: the currently connected bssid (for reporting)
 * @csa_ie: parsed 802.11 csa elements on count, mode, chandef and mesh ttl.
        All of them will be filled with if success only.
 * Return: 0 on success, <0 on error and >0 if there is nothing to parse.
 */
int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
                                 struct ieee802_11_elems *elems,
                                 enum nl80211_band current_band,
                                 u32 sta_flags, u8 *bssid,
                                 struct ieee80211_csa_ie *csa_ie);

/* 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) &&
             !test_bit(SCAN_COMPLETED, &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 const void *const mac80211_wiphy_privid; /* for wiphy privid */
int ieee80211_frame_duration(enum nl80211_band band, size_t len,
                             int rate, int erp, int short_preamble,
                             int shift);
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
                               bool bss_notify, bool enable_qos);
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
                    struct sta_info *sta, struct sk_buff *skb);

void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
                                 struct sk_buff *skb, int tid,
                                 enum nl80211_band band);

static inline void
ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
                          struct sk_buff *skb, int tid,
                          enum nl80211_band band)
{
        rcu_read_lock();
        __ieee80211_tx_skb_tid_band(sdata, skb, tid, band);
        rcu_read_unlock();
}

static inline void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
                                        struct sk_buff *skb, int tid)
{
        struct ieee80211_chanctx_conf *chanctx_conf;

        rcu_read_lock();
        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
        if (WARN_ON(!chanctx_conf)) {
                rcu_read_unlock();
                kfree_skb(skb);
                return;
        }

        __ieee80211_tx_skb_tid_band(sdata, skb, tid,
                                    chanctx_conf->def.chan->band);
        rcu_read_unlock();
}

static inline void 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);
}

u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
                               struct ieee802_11_elems *elems,
                               u64 filter, u32 crc);
static inline void ieee802_11_parse_elems(const u8 *start, size_t len,
                                          bool action,
                                          struct ieee802_11_elems *elems)
{
        ieee802_11_parse_elems_crc(start, len, action, elems, 0, 0);
}


extern const int ieee802_1d_to_ac[8];

static inline int ieee80211_ac_from_tid(int tid)
{
        return ieee802_1d_to_ac[tid & 7];
}

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,
                             bool 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, u16 tx_time);

void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
                                     unsigned long queues,
                                     enum queue_stop_reason reason,
                                     bool refcounted);
void ieee80211_stop_vif_queues(struct ieee80211_local *local,
                               struct ieee80211_sub_if_data *sdata,
                               enum queue_stop_reason reason);
void ieee80211_wake_vif_queues(struct ieee80211_local *local,
                               struct ieee80211_sub_if_data *sdata,
                               enum queue_stop_reason reason);
void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
                                     unsigned long queues,
                                     enum queue_stop_reason reason,
                                     bool refcounted);
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
                                    enum queue_stop_reason reason,
                                    bool refcounted);
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
                                    enum queue_stop_reason reason,
                                    bool refcounted);
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(struct ieee80211_local *local,
                                struct sk_buff_head *skbs);
void ieee80211_flush_queues(struct ieee80211_local *local,
                            struct ieee80211_sub_if_data *sdata, bool drop);
void __ieee80211_flush_queues(struct ieee80211_local *local,
                              struct ieee80211_sub_if_data *sdata,
                              unsigned int queues, bool drop);

static inline bool ieee80211_can_run_worker(struct ieee80211_local *local)
{
        /*
         * If quiescing is set, we are racing with __ieee80211_suspend.
         * __ieee80211_suspend flushes the workers after setting quiescing,
         * and we check quiescing / suspended before enqueing new workers.
         * We should abort the worker to avoid the races below.
         */
        if (local->quiescing)
                return false;

        /*
         * We might already be suspended if the following scenario occurs:
         * __ieee80211_suspend          Control path
         *
         *                              if (local->quiescing)
         *                                      return;
         * local->quiescing = true;
         * flush_workqueue();
         *                              queue_work(...);
         * local->suspended = true;
         * local->quiescing = false;
         *                              worker starts running...
         */
        if (local->suspended)
                return false;

        return true;
}

int ieee80211_txq_setup_flows(struct ieee80211_local *local);
void ieee80211_txq_teardown_flows(struct ieee80211_local *local);
void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
                        struct sta_info *sta,
                        struct txq_info *txq, int tid);
void ieee80211_txq_purge(struct ieee80211_local *local,
                         struct txq_info *txqi);
void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
                         u16 transaction, u16 auth_alg, u16 status,
                         const u8 *extra, size_t extra_len, const u8 *bssid,
                         const u8 *da, const u8 *key, u8 key_len, u8 key_idx,
                         u32 tx_flags);
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,
                             size_t buffer_len,
                             struct ieee80211_scan_ies *ie_desc,
                             const u8 *ie, size_t ie_len,
                             u8 bands_used, u32 *rate_masks,
                             struct cfg80211_chan_def *chandef);
struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
                                          const u8 *src, const 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,
                              const u8 *src, const u8 *dst,
                              const u8 *ssid, size_t ssid_len,
                              const u8 *ie, size_t ie_len,
                              u32 ratemask, bool directed, u32 tx_flags,
                              struct ieee80211_channel *channel, bool scan);

u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
                            struct ieee802_11_elems *elems,
                            enum nl80211_band band, u32 *basic_rates);
int __ieee80211_request_smps_mgd(struct ieee80211_sub_if_data *sdata,
                                 enum ieee80211_smps_mode smps_mode);
int __ieee80211_request_smps_ap(struct ieee80211_sub_if_data *sdata,
                                enum ieee80211_smps_mode smps_mode);
void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata);
void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata);

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,
                               const struct cfg80211_chan_def *chandef,
                               u16 prot_mode, bool rifs_mode);

u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
                               u32 cap);
u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
                                const struct cfg80211_chan_def *chandef);
int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
                             const struct ieee80211_supported_band *sband,
                             const u8 *srates, int srates_len, u32 *rates);
int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
                            struct sk_buff *skb, bool need_basic,
                            enum nl80211_band band);
int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
                                struct sk_buff *skb, bool need_basic,
                                enum nl80211_band band);
u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo);

/* channel management */
bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
                               struct cfg80211_chan_def *chandef);
bool ieee80211_chandef_vht_oper(const struct ieee80211_vht_operation *oper,
                                struct cfg80211_chan_def *chandef);
u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c);

int __must_check
ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
                          const struct cfg80211_chan_def *chandef,
                          enum ieee80211_chanctx_mode mode);
int __must_check
ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
                              const struct cfg80211_chan_def *chandef,
                              enum ieee80211_chanctx_mode mode,
                              bool radar_required);
int __must_check
ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata);
int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata);

int __must_check
ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
                               const struct cfg80211_chan_def *chandef,
                               u32 *changed);
void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata);
void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata);
void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
                                         bool clear);
int ieee80211_chanctx_refcount(struct ieee80211_local *local,
                               struct ieee80211_chanctx *ctx);

void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
                                   struct ieee80211_chanctx *chanctx);
void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
                                      struct ieee80211_chanctx *ctx);
bool ieee80211_is_radar_required(struct ieee80211_local *local);

void ieee80211_dfs_cac_timer(unsigned long data);
void ieee80211_dfs_cac_timer_work(struct work_struct *work);
void ieee80211_dfs_cac_cancel(struct ieee80211_local *local);
void ieee80211_dfs_radar_detected_work(struct work_struct *work);
int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
                              struct cfg80211_csa_settings *csa_settings);

bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs);
bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n);
const struct ieee80211_cipher_scheme *
ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
                 enum nl80211_iftype iftype);
int ieee80211_cs_headroom(struct ieee80211_local *local,
                          struct cfg80211_crypto_settings *crypto,
                          enum nl80211_iftype iftype);
void ieee80211_recalc_dtim(struct ieee80211_local *local,
                           struct ieee80211_sub_if_data *sdata);
int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
                                 const struct cfg80211_chan_def *chandef,
                                 enum ieee80211_chanctx_mode chanmode,
                                 u8 radar_detect);
int ieee80211_max_num_channels(struct ieee80211_local *local);
enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta);
void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
                                       struct ieee80211_chanctx *ctx);

/* TDLS */
int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
                        const u8 *peer, u8 action_code, u8 dialog_token,
                        u16 status_code, u32 peer_capability,
                        bool initiator, const u8 *extra_ies,
                        size_t extra_ies_len);
int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
                        const u8 *peer, enum nl80211_tdls_operation oper);
void ieee80211_tdls_peer_del_work(struct work_struct *wk);
int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
                                  const u8 *addr, u8 oper_class,
                                  struct cfg80211_chan_def *chandef);
void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
                                          struct net_device *dev,
                                          const u8 *addr);
void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata);
void ieee80211_tdls_chsw_work(struct work_struct *wk);

extern const struct ethtool_ops ieee80211_ethtool_ops;

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

#endif /* IEEE80211_I_H */