/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef 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 <net/cfg80211.h>
#include <net/mac80211.h>
#include "key.h"
#include "sta_info.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

/*
 * Time after which we ignore scan results and no longer report/use
 * them in any way.
 */
#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)

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

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 {
        /* Yes, this is a hack */
        struct cfg80211_bss cbss;

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

        u8 dtim_period;

        bool wmm_used;

        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 assocation, 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;
};

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_FRAGMENTED         BIT(0)
#define IEEE80211_TX_UNICAST            BIT(1)
#define IEEE80211_TX_PS_BUFFERED        BIT(2)

struct ieee80211_tx_data {
        struct sk_buff *skb;
        struct net_device *dev;
        struct ieee80211_local *local;
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta;
        struct ieee80211_key *key;

        struct ieee80211_channel *channel;

        u16 ethertype;
        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)

#define IEEE80211_RX_IN_SCAN            BIT(0)
/* frame is destined to interface currently processed (incl. multicast frames) */
#define IEEE80211_RX_RA_MATCH           BIT(1)
#define IEEE80211_RX_AMSDU              BIT(2)
#define IEEE80211_RX_CMNTR_REPORTED     BIT(3)
#define IEEE80211_RX_FRAGMENTED         BIT(4)

struct ieee80211_rx_data {
        struct sk_buff *skb;
        struct net_device *dev;
        struct ieee80211_local *local;
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta;
        struct ieee80211_key *key;
        struct ieee80211_rx_status *status;
        struct ieee80211_rate *rate;

        unsigned int flags;
        int sent_ps_buffered;
        int queue;
        u32 tkip_iv32;
        u16 tkip_iv16;
};

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

struct ieee80211_if_ap {
        struct beacon_data *beacon;

        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 */
        int dtim_count;
};

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

struct ieee80211_if_vlan {
        struct list_head list;
};

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 */
        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;
};

enum ieee80211_mgd_state {
        IEEE80211_MGD_STATE_IDLE,
        IEEE80211_MGD_STATE_PROBE,
        IEEE80211_MGD_STATE_AUTH,
        IEEE80211_MGD_STATE_ASSOC,
};

struct ieee80211_mgd_work {
        struct list_head list;
        struct ieee80211_bss *bss;
        int ie_len;
        u8 prev_bssid[ETH_ALEN];
        u8 ssid[IEEE80211_MAX_SSID_LEN];
        u8 ssid_len;
        unsigned long timeout;
        enum ieee80211_mgd_state state;
        u16 auth_alg, auth_transaction;

        int tries;

        u8 key[WLAN_KEY_LEN_WEP104];
        u8 key_len, key_idx;

        /* must be last */
        u8 ie[0]; /* for auth or assoc frame, not probe */
};

/* 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_WMM_ENABLED       = BIT(3),
        IEEE80211_STA_DISABLE_11N       = BIT(4),
        IEEE80211_STA_CSA_RECEIVED      = BIT(5),
        IEEE80211_STA_MFP_ENABLED       = BIT(6),
};

/* flags for MLME request */
enum ieee80211_sta_request {
        IEEE80211_STA_REQ_SCAN,
};

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 work;
        struct work_struct monitor_work;
        struct work_struct chswitch_work;
        struct work_struct beacon_loss_work;

        unsigned long probe_timeout;
        int probe_send_count;

        struct mutex mtx;
        struct ieee80211_bss *associated;
        struct ieee80211_mgd_work *old_associate_work;
        struct list_head work_list;

        u8 bssid[ETH_ALEN];

        u16 aid;
        u16 capab;

        struct sk_buff_head skb_queue;

        unsigned long timers_running; /* used for quiesce/restart */
        bool powersave; /* powersave requested for this iface */

        unsigned long request;

        unsigned int flags;

        u32 beacon_crc;

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

        int wmm_last_param_set;
};

enum ieee80211_ibss_request {
        IEEE80211_IBSS_REQ_RUN  = 0,
};

struct ieee80211_if_ibss {
        struct timer_list timer;
        struct work_struct work;

        struct sk_buff_head skb_queue;

        unsigned long request;
        unsigned long last_scan_completed;

        bool timer_running;

        bool fixed_bssid;
        bool fixed_channel;
        bool privacy;

        u8 bssid[ETH_ALEN];
        u8 ssid[IEEE80211_MAX_SSID_LEN];
        u8 ssid_len, ie_len;
        u8 *ie;
        struct ieee80211_channel *channel;

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

        enum {
                IEEE80211_IBSS_MLME_SEARCH,
                IEEE80211_IBSS_MLME_JOINED,
        } state;
};

struct ieee80211_if_mesh {
        struct work_struct work;
        struct timer_list housekeeping_timer;
        struct timer_list mesh_path_timer;
        struct sk_buff_head skb_queue;

        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[4];
        /* Active Path Selection Metric Identifier */
        u8 mesh_pm_id[4];
        /* Congestion Control Mode Identifier */
        u8 mesh_cc_id[4];
        /* Synchronization Protocol Identifier */
        u8 mesh_sp_id[4];
        /* Authentication Protocol Identifier */
        u8 mesh_auth_id[4];
        /* Local mesh Destination Sequence Number */
        u32 dsn;
        /* Last used PREQ ID */
        u32 preq_id;
        atomic_t mpaths;
        /* Timestamp of last DSN update */
        unsigned long last_dsn_update;
        /* Timestamp of last DSN 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;
};

#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_PROMISC: interface is promisc
 * @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.
 */
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),
};

struct ieee80211_sub_if_data {
        struct list_head list;

        struct wireless_dev wdev;

        /* keys */
        struct list_head key_list;

        struct net_device *dev;
        struct ieee80211_local *local;

        unsigned int flags;

        int drop_unencrypted;

        /*
         * keep track of whether the HT opmode (stored in
         * vif.bss_info.ht_operation_mode) is valid.
         */
        bool ht_opmode_valid;

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

#define NUM_DEFAULT_KEYS 4
#define NUM_DEFAULT_MGMT_KEYS 2
        struct ieee80211_key *keys[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
        struct ieee80211_key *default_key;
        struct ieee80211_key *default_mgmt_key;

        u16 sequence_number;

        /*
         * 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;

        int force_unicast_rateidx; /* forced TX rateidx for unicast frames */
        int max_ratectrl_rateidx; /* max TX rateidx for rate control */

        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;
#ifdef CONFIG_MAC80211_MESH
                struct ieee80211_if_mesh mesh;
#endif
                u32 mntr_flags;
        } u;

#ifdef CONFIG_MAC80211_DEBUGFS
        struct dentry *debugfsdir;
        union {
                struct {
                        struct dentry *drop_unencrypted;
                        struct dentry *bssid;
                        struct dentry *aid;
                        struct dentry *capab;
                        struct dentry *force_unicast_rateidx;
                        struct dentry *max_ratectrl_rateidx;
                } sta;
                struct {
                        struct dentry *drop_unencrypted;
                        struct dentry *num_sta_ps;
                        struct dentry *dtim_count;
                        struct dentry *force_unicast_rateidx;
                        struct dentry *max_ratectrl_rateidx;
                        struct dentry *num_buffered_multicast;
                } ap;
                struct {
                        struct dentry *drop_unencrypted;
                        struct dentry *peer;
                        struct dentry *force_unicast_rateidx;
                        struct dentry *max_ratectrl_rateidx;
                } wds;
                struct {
                        struct dentry *drop_unencrypted;
                        struct dentry *force_unicast_rateidx;
                        struct dentry *max_ratectrl_rateidx;
                } vlan;
                struct {
                        struct dentry *mode;
                } monitor;
        } debugfs;
        struct {
                struct dentry *default_key;
                struct dentry *default_mgmt_key;
        } common_debugfs;

#ifdef CONFIG_MAC80211_MESH
        struct dentry *mesh_stats_dir;
        struct {
                struct dentry *fwded_mcast;
                struct dentry *fwded_unicast;
                struct dentry *fwded_frames;
                struct dentry *dropped_frames_ttl;
                struct dentry *dropped_frames_no_route;
                struct dentry *estab_plinks;
                struct timer_list mesh_path_timer;
        } mesh_stats;

        struct dentry *mesh_config_dir;
        struct {
                struct dentry *dot11MeshRetryTimeout;
                struct dentry *dot11MeshConfirmTimeout;
                struct dentry *dot11MeshHoldingTimeout;
                struct dentry *dot11MeshMaxRetries;
                struct dentry *dot11MeshTTL;
                struct dentry *auto_open_plinks;
                struct dentry *dot11MeshMaxPeerLinks;
                struct dentry *dot11MeshHWMPactivePathTimeout;
                struct dentry *dot11MeshHWMPpreqMinInterval;
                struct dentry *dot11MeshHWMPnetDiameterTraversalTime;
                struct dentry *dot11MeshHWMPmaxPREQretries;
                struct dentry *path_refresh_time;
                struct dentry *min_discovery_timeout;
        } mesh_config;
#endif

#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
ieee80211_sdata_set_mesh_id(struct ieee80211_sub_if_data *sdata,
                            u8 mesh_id_len, u8 *mesh_id)
{
#ifdef CONFIG_MAC80211_MESH
        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
        ifmsh->mesh_id_len = mesh_id_len;
        memcpy(ifmsh->mesh_id, mesh_id, mesh_id_len);
#else
        WARN_ON(1);
#endif
}

enum {
        IEEE80211_RX_MSG        = 1,
        IEEE80211_TX_STATUS_MSG = 2,
        IEEE80211_DELBA_MSG     = 3,
        IEEE80211_ADDBA_MSG     = 4,
};

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,
};

/**
 * 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_OFF_CHANNEL: We're off our operating channel for scanning,
 *      gets only set in conjunction with SCAN_SW_SCANNING
 */
enum {
        SCAN_SW_SCANNING,
        SCAN_HW_SCANNING,
        SCAN_OFF_CHANNEL,
};

/**
 * 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_LEAVE_OPER_CHANNEL: Leave the operating channel, notify the AP
 *      about us leaving the channel and stop all associated STA interfaces
 * @SCAN_ENTER_OPER_CHANNEL: Enter the operating channel again, notify the
 *      AP about us being back and restart all associated STA interfaces
 */
enum mac80211_scan_state {
        SCAN_DECISION,
        SCAN_SET_CHANNEL,
        SCAN_SEND_PROBE,
        SCAN_LEAVE_OPER_CHANNEL,
        SCAN_ENTER_OPER_CHANNEL,
};

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;
        unsigned int filter_flags; /* FIF_* */
        struct iw_statistics wstats;

        /* 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 dev_addr_list *mc_list;
        int mc_count;

        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;

        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;

        /* Station data */
        /*
         * The lock only protects the list, hash, timer and counter
         * against manipulation, reads are done in RCU. Additionally,
         * the lock protects each BSS's TIM bitmap.
         */
        spinlock_t sta_lock;
        unsigned long num_sta;
        struct list_head sta_list;
        struct sta_info *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;

        /*
         * This lock is used to prevent concurrent A-MPDU
         * session start/stop processing, this thus also
         * synchronises the ->ampdu_action() callback to
         * drivers and limits it to one at a time.
         */
        spinlock_t ampdu_lock;

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

        struct rate_control_ref *rate_ctrl;

        struct crypto_blkcipher *wep_tx_tfm;
        struct crypto_blkcipher *wep_rx_tfm;
        u32 wep_iv;

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

        /*
         * Key lock, protects sdata's key_list and sta_info's
         * key pointers (write access, they're RCU.)
         */
        spinlock_t key_lock;


        /* Scanning and BSS list */
        struct mutex scan_mtx;
        unsigned long scanning;
        struct cfg80211_ssid scan_ssid;
        struct cfg80211_scan_request *int_scan_req;
        struct cfg80211_scan_request *scan_req;
        struct ieee80211_channel *scan_channel;
        const u8 *orig_ies;
        int orig_ies_len;
        int scan_channel_idx;
        int scan_ies_len;

        enum mac80211_scan_state next_scan_state;
        struct delayed_work scan_work;
        struct ieee80211_sub_if_data *scan_sdata;
        enum nl80211_channel_type oper_channel_type;
        struct ieee80211_channel *oper_channel, *csa_channel;

        /* 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;
        char tx_led_name[32], rx_led_name[32],
             assoc_led_name[32], radio_led_name[32];
#endif

#ifdef CONFIG_MAC80211_DEBUGFS
        struct work_struct sta_debugfs_add;
#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 rx_handlers_drop_passive_scan;
        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
                                */
        int wifi_wme_noack_test;
        unsigned int wmm_acm; /* bit field of ACM bits (BIT(802.1D tag)) */

        bool pspolling;
        /*
         * 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;

        int user_power_level; /* in dBm */
        int power_constr_level; /* in dBm */

        struct work_struct restart_work;

#ifdef CONFIG_MAC80211_DEBUGFS
        struct local_debugfsdentries {
                struct dentry *rcdir;
                struct dentry *rcname;
                struct dentry *frequency;
                struct dentry *total_ps_buffered;
                struct dentry *wep_iv;
                struct dentry *tsf;
                struct dentry *queues;
                struct dentry *reset;
                struct dentry *noack;
                struct dentry *statistics;
                struct local_debugfsdentries_statsdentries {
                        struct dentry *transmitted_fragment_count;
                        struct dentry *multicast_transmitted_frame_count;
                        struct dentry *failed_count;
                        struct dentry *retry_count;
                        struct dentry *multiple_retry_count;
                        struct dentry *frame_duplicate_count;
                        struct dentry *received_fragment_count;
                        struct dentry *multicast_received_frame_count;
                        struct dentry *transmitted_frame_count;
                        struct dentry *wep_undecryptable_count;
                        struct dentry *num_scans;
#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
                        struct dentry *tx_handlers_drop;
                        struct dentry *tx_handlers_queued;
                        struct dentry *tx_handlers_drop_unencrypted;
                        struct dentry *tx_handlers_drop_fragment;
                        struct dentry *tx_handlers_drop_wep;
                        struct dentry *tx_handlers_drop_not_assoc;
                        struct dentry *tx_handlers_drop_unauth_port;
                        struct dentry *rx_handlers_drop;
                        struct dentry *rx_handlers_queued;
                        struct dentry *rx_handlers_drop_nullfunc;
                        struct dentry *rx_handlers_drop_defrag;
                        struct dentry *rx_handlers_drop_short;
                        struct dentry *rx_handlers_drop_passive_scan;
                        struct dentry *tx_expand_skb_head;
                        struct dentry *tx_expand_skb_head_cloned;
                        struct dentry *rx_expand_skb_head;
                        struct dentry *rx_expand_skb_head2;
                        struct dentry *rx_handlers_fragments;
                        struct dentry *tx_status_drop;
#endif
                        struct dentry *dot11ACKFailureCount;
                        struct dentry *dot11RTSFailureCount;
                        struct dentry *dot11FCSErrorCount;
                        struct dentry *dot11RTSSuccessCount;
                } stats;
                struct dentry *stations;
                struct dentry *keys;
        } debugfs;
#endif
};

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

/* 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_info *ht_info_elem;
        u8 *mesh_config;
        u8 *mesh_id;
        u8 *peer_link;
        u8 *preq;
        u8 *prep;
        u8 *perr;
        u8 *ch_switch_elem;
        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_config_len;
        u8 mesh_id_len;
        u8 peer_link_len;
        u8 preq_len;
        u8 prep_len;
        u8 perr_len;
        u8 ch_switch_elem_len;
        u8 country_elem_len;
        u8 pwr_constr_elem_len;
        u8 quiet_elem_len;
        u8 num_of_quiet_elem;   /* can be more the one */
        u8 timeout_int_len;
};

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

static inline struct ieee80211_hw *local_to_hw(
        struct ieee80211_local *local)
{
        return &local->hw;
}


static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
{
        return compare_ether_addr(raddr, addr) == 0 ||
               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,
                         void *cookie);
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
                           struct cfg80211_disassoc_request *req,
                           void *cookie);
ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
                                          struct sk_buff *skb);
void ieee80211_send_pspoll(struct ieee80211_local *local,
                           struct ieee80211_sub_if_data *sdata);
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency);

int ieee80211_max_network_latency(struct notifier_block *nb,
                                  unsigned long data, void *dummy);
void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_channel_sw_ie *sw_elem,
                                      struct ieee80211_bss *bss);
void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_restart(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);
ieee80211_rx_result
ieee80211_ibss_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb);
struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
                                        u8 *bssid, 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);

/* 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);
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
                           struct cfg80211_scan_request *req);
void ieee80211_scan_cancel(struct ieee80211_local *local);
ieee80211_rx_result
ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, 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);
struct ieee80211_bss *
ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
                     u8 *ssid, u8 ssid_len);
void ieee80211_rx_bss_put(struct ieee80211_local *local,
                          struct ieee80211_bss *bss);

/* interface handling */
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
                     struct net_device **new_dev, 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_recalc_idle(struct ieee80211_local *local);
void ieee80211_recalc_idle(struct ieee80211_local *local);

/* 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);

/* HT */
void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
                                       struct ieee80211_ht_cap *ht_cap_ie,
                                       struct ieee80211_sta_ht_cap *ht_cap);
void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn);
void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
                          const u8 *da, u16 tid,
                          u16 initiator, u16 reason_code);

void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *da,
                                u16 tid, u16 initiator, u16 reason);
void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
                                    u16 initiator, u16 reason);
void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta);
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);
int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
                                    enum ieee80211_back_parties initiator);

/* 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);

#ifdef CONFIG_PM
int __ieee80211_suspend(struct ieee80211_hw *hw);

static inline int __ieee80211_resume(struct ieee80211_hw *hw)
{
        return ieee80211_reconfig(hw_to_local(hw));
}
#else
static inline int __ieee80211_suspend(struct ieee80211_hw *hw)
{
        return 0;
}

static inline int __ieee80211_resume(struct ieee80211_hw *hw)
{
        return 0;
}
#endif

/* 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(struct ieee80211_local *local, 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);
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
                      int encrypt);
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_beacon_loss_work(struct work_struct *work);

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_add_pending_skb(struct ieee80211_local *local,
                               struct sk_buff *skb);
int ieee80211_add_pending_skbs(struct ieee80211_local *local,
                               struct sk_buff_head *skbs);

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 *key, u8 key_len, u8 key_idx);
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
                             const u8 *ie, size_t ie_len);
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);

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);

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

#endif /* IEEE80211_I_H */