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* Copyright 2002-2005, Devicescape Software, Inc.
* 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 STA_INFO_H
#define STA_INFO_H
#include <linux/list.h>
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/workqueue.h>
#include <linux/average.h>
#include <linux/etherdevice.h>
#include "key.h"
* enum ieee80211_sta_info_flags - Stations flags
* These flags are used with &struct sta_info's @flags member, but
* only indirectly with set_sta_flag() and friends.
* @WLAN_STA_AUTH: Station is authenticated.
* @WLAN_STA_ASSOC: Station is associated.
* @WLAN_STA_PS_STA: Station is in power-save mode
* @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
* This bit is always checked so needs to be enabled for all stations
* when virtual port control is not in use.
* @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
* frames.
* @WLAN_STA_WME: Station is a QoS-STA.
* @WLAN_STA_WDS: Station is one of our WDS peers.
* @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
* IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
* frame to this station is transmitted.
* @WLAN_STA_MFP: Management frame protection is used with this STA.
* @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
* during suspend/resume and station removal.
* @WLAN_STA_PS_DRIVER: driver requires keeping this station in
* power-save mode logically to flush frames that might still
* be in the queues
* @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
* station in power-save mode, reply when the driver unblocks.
* @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
* @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
* packets. This means the link is enabled.
* @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
* keeping station in power-save mode, reply when the driver
* unblocks the station.
* @WLAN_STA_SP: Station is in a service period, so don't try to
* reply to other uAPSD trigger frames or PS-Poll.
* @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
* @WLAN_STA_INSERTED: This station is inserted into the hash table.
* @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
* @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
* @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
* @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
enum ieee80211_sta_info_flags {
enum ieee80211_agg_stop_reason {
* struct tid_ampdu_tx - TID aggregation information (Tx).
* @rcu_head: rcu head for freeing structure
* @session_timer: check if we keep Tx-ing on the TID (by timeout value)
* @addba_resp_timer: timer for peer's response to addba request
* @pending: pending frames queue -- use sta's spinlock to protect
* @dialog_token: dialog token for aggregation session
* @timeout: session timeout value to be filled in ADDBA requests
* @state: session state (see above)
* @last_tx: jiffies of last tx activity
* @stop_initiator: initiator of a session stop
* @tx_stop: TX DelBA frame when stopping
* @buf_size: reorder buffer size at receiver
* @failed_bar_ssn: ssn of the last failed BAR tx attempt
* @bar_pending: BAR needs to be re-sent
* This structure's lifetime is managed by RCU, assignments to
* the array holding it must hold the aggregation mutex.
* The TX path can access it under RCU lock-free if, and
* only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
* set. Otherwise, the TX path must also acquire the spinlock
* and re-check the state, see comments in the tx code
* touching it.
struct tid_ampdu_tx {
struct rcu_head rcu_head;
struct timer_list session_timer;
struct timer_list addba_resp_timer;
struct sk_buff_head pending;
unsigned long state;
unsigned long last_tx;
u16 timeout;
u8 dialog_token;
u8 stop_initiator;
bool tx_stop;
u8 buf_size;
u16 failed_bar_ssn;
bool bar_pending;
* struct tid_ampdu_rx - TID aggregation information (Rx).
* @reorder_buf: buffer to reorder incoming aggregated MPDUs
* @reorder_time: jiffies when skb was added
* @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
* @reorder_timer: releases expired frames from the reorder buffer.
* @last_rx: jiffies of last rx activity
* @head_seq_num: head sequence number in reordering buffer.
* @stored_mpdu_num: number of MPDUs in reordering buffer
* @ssn: Starting Sequence Number expected to be aggregated.
* @buf_size: buffer size for incoming A-MPDUs
* @timeout: reset timer value (in TUs).
* @dialog_token: dialog token for aggregation session
* @rcu_head: RCU head used for freeing this struct
* @reorder_lock: serializes access to reorder buffer, see below.
* This structure's lifetime is managed by RCU, assignments to
* the array holding it must hold the aggregation mutex.
* The @reorder_lock is used to protect the members of this
* struct, except for @timeout, @buf_size and @dialog_token,
* which are constant across the lifetime of the struct (the
* dialog token being used only for debugging).
struct tid_ampdu_rx {
struct rcu_head rcu_head;
spinlock_t reorder_lock;
struct sk_buff **reorder_buf;
unsigned long *reorder_time;
struct timer_list session_timer;
struct timer_list reorder_timer;
unsigned long last_rx;
u16 head_seq_num;
u16 stored_mpdu_num;
u16 ssn;
u16 buf_size;
u16 timeout;
u8 dialog_token;
* struct sta_ampdu_mlme - STA aggregation information.
* @tid_rx: aggregation info for Rx per TID -- RCU protected
* @tid_tx: aggregation info for Tx per TID
* @tid_start_tx: sessions where start was requested
* @addba_req_num: number of times addBA request has been sent.
* @last_addba_req_time: timestamp of the last addBA request.
* @dialog_token_allocator: dialog token enumerator for each new session;
* @work: work struct for starting/stopping aggregation
* @tid_rx_timer_expired: bitmap indicating on which TIDs the
* RX timer expired until the work for it runs
* @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the
* driver requested to close until the work for it runs
* @mtx: mutex to protect all TX data (except non-NULL assignments
* to tid_tx[idx], which are protected by the sta spinlock)
* tid_start_tx is also protected by sta->lock.
struct sta_ampdu_mlme {
struct mutex mtx;
/* rx */
struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
/* tx */
struct work_struct work;
struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
u8 addba_req_num[IEEE80211_NUM_TIDS];
u8 dialog_token_allocator;
* struct sta_info - STA information
* This structure collects information about a station that
* mac80211 is communicating with.
* @list: global linked list entry
* @hnext: hash table linked list pointer
* @local: pointer to the global information
* @sdata: virtual interface this station belongs to
* @ptk: peer key negotiated with this station, if any
* @gtk: group keys negotiated with this station, if any
* @rate_ctrl: rate control algorithm reference
* @rate_ctrl_priv: rate control private per-STA pointer
* @last_tx_rate: rate used for last transmit, to report to userspace as
* "the" transmit rate
* @last_rx_rate_idx: rx status rate index of the last data packet
* @last_rx_rate_flag: rx status flag of the last data packet
* @last_rx_rate_vht_nss: rx status nss of last data packet
* @lock: used for locking all fields that require locking, see comments
* in the header file.
* @drv_unblock_wk: used for driver PS unblocking
* @listen_interval: listen interval of this station, when we're acting as AP
* @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
* @ps_tx_buf: buffers (per AC) of frames to transmit to this station
* when it leaves power saving state or polls
* @tx_filtered: buffers (per AC) of frames we already tried to
* transmit but were filtered by hardware due to STA having
* entered power saving state, these are also delivered to
* the station when it leaves powersave or polls for frames
* @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
* @rx_packets: Number of MSDUs received from this STA
* @rx_bytes: Number of bytes received from this STA
* @wep_weak_iv_count: number of weak WEP IVs received from this station
* @last_rx: time (in jiffies) when last frame was received from this STA
* @last_connected: time (in seconds) when a station got connected
* @num_duplicates: number of duplicate frames received from this STA
* @rx_fragments: number of received MPDUs
* @rx_dropped: number of dropped MPDUs from this STA
* @last_signal: signal of last received frame from this STA
* @avg_signal: moving average of signal of received frames from this STA
* @last_ack_signal: signal of last received Ack frame from this STA
* @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
* @tx_filtered_count: number of frames the hardware filtered for this STA
* @tx_retry_failed: number of frames that failed retry
* @tx_retry_count: total number of retries for frames to this STA
* @fail_avg: moving percentage of failed MSDUs
* @tx_packets: number of RX/TX MSDUs
* @tx_bytes: number of bytes transmitted to this STA
* @tx_fragments: number of transmitted MPDUs
* @tid_seq: per-TID sequence numbers for sending to this STA
* @ampdu_mlme: A-MPDU state machine state
* @timer_to_tid: identity mapping to ID timers
* @llid: Local link ID
* @plid: Peer link ID
* @reason: Cancel reason on PLINK_HOLDING state
* @plink_retries: Retries in establishment
* @ignore_plink_timer: ignore the peer-link timer (used internally)
* @plink_state: peer link state
* @plink_timeout: timeout of peer link
* @plink_timer: peer link watch timer
* @t_offset: timing offset relative to this host
* @t_offset_setpoint: reference timing offset of this sta to be used when
* calculating clockdrift
* @local_pm: local link-specific power save mode
* @peer_pm: peer-specific power save mode towards local STA
* @nonpeer_pm: STA power save mode towards non-peer neighbors
* @debugfs: debug filesystem info
* @dead: set to true when sta is unlinked
* @uploaded: set to true when sta is uploaded to the driver
* @lost_packets: number of consecutive lost packets
* @sta: station information we share with the driver
* @sta_state: duplicates information about station state (for debug)
* @beacon_loss_count: number of times beacon loss has triggered
* @rcu_head: RCU head used for freeing this station struct
* @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
* taken from HT/VHT capabilities or VHT operating mode notification
* @chains: chains ever used for RX from this station
* @chain_signal_last: last signal (per chain)
* @chain_signal_avg: signal average (per chain)
struct sta_info {
/* General information, mostly static */
struct list_head list;
struct rcu_head rcu_head;
struct sta_info __rcu *hnext;
struct ieee80211_local *local;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
struct ieee80211_key __rcu *ptk;
struct rate_control_ref *rate_ctrl;
void *rate_ctrl_priv;
spinlock_t lock;
struct work_struct drv_unblock_wk;
u16 listen_interval;
bool dead;
bool uploaded;
enum ieee80211_sta_state sta_state;
/* use the accessors defined below */
unsigned long _flags;
* STA powersave frame queues, no more than the internal
* locking required.
struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
unsigned long driver_buffered_tids;
/* Updated from RX path only, no locking requirements */
unsigned long rx_packets;
u64 rx_bytes;
unsigned long wep_weak_iv_count;
unsigned long last_rx;
long last_connected;
unsigned long num_duplicates;
unsigned long rx_fragments;
unsigned long rx_dropped;
int last_signal;
struct ewma avg_signal;
int last_ack_signal;
u8 chains;
s8 chain_signal_last[IEEE80211_MAX_CHAINS];
struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS];
/* Plus 1 for non-QoS frames */
__le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
/* Updated from TX status path only, no locking requirements */
unsigned long tx_filtered_count;
unsigned long tx_retry_failed, tx_retry_count;
/* moving percentage of failed MSDUs */
unsigned int fail_avg;
/* Updated from TX path only, no locking requirements */
u32 tx_fragments;
u64 tx_packets[IEEE80211_NUM_ACS];
u64 tx_bytes[IEEE80211_NUM_ACS];
struct ieee80211_tx_rate last_tx_rate;
int last_rx_rate_idx;
u32 last_rx_rate_flag;
u8 last_rx_rate_vht_nss;
u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
* Aggregation information, locked with lock.
struct sta_ampdu_mlme ampdu_mlme;
u8 timer_to_tid[IEEE80211_NUM_TIDS];
#ifdef CONFIG_MAC80211_MESH
* Mesh peer link attributes
* TODO: move to a sub-structure that is referenced with pointer?
__le16 llid;
__le16 plid;
__le16 reason;
u8 plink_retries;
bool ignore_plink_timer;
enum nl80211_plink_state plink_state;
u32 plink_timeout;
struct timer_list plink_timer;
s64 t_offset;
s64 t_offset_setpoint;
/* mesh power save */
enum nl80211_mesh_power_mode local_pm;
enum nl80211_mesh_power_mode peer_pm;
enum nl80211_mesh_power_mode nonpeer_pm;
struct sta_info_debugfsdentries {
struct dentry *dir;
bool add_has_run;
} debugfs;
enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
unsigned int lost_packets;
unsigned int beacon_loss_count;
/* keep last! */
struct ieee80211_sta sta;
static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
#ifdef CONFIG_MAC80211_MESH
return sta->plink_state;
return NL80211_PLINK_LISTEN;
static inline void set_sta_flag(struct sta_info *sta,
enum ieee80211_sta_info_flags flag)
flag == WLAN_STA_ASSOC ||
set_bit(flag, &sta->_flags);
static inline void clear_sta_flag(struct sta_info *sta,
enum ieee80211_sta_info_flags flag)
flag == WLAN_STA_ASSOC ||
clear_bit(flag, &sta->_flags);
static inline int test_sta_flag(struct sta_info *sta,
enum ieee80211_sta_info_flags flag)
return test_bit(flag, &sta->_flags);
static inline int test_and_clear_sta_flag(struct sta_info *sta,
enum ieee80211_sta_info_flags flag)
flag == WLAN_STA_ASSOC ||
return test_and_clear_bit(flag, &sta->_flags);
static inline int test_and_set_sta_flag(struct sta_info *sta,
enum ieee80211_sta_info_flags flag)
flag == WLAN_STA_ASSOC ||
return test_and_set_bit(flag, &sta->_flags);
int sta_info_move_state(struct sta_info *sta,
enum ieee80211_sta_state new_state);
static inline void sta_info_pre_move_state(struct sta_info *sta,
enum ieee80211_sta_state new_state)
int ret;
WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
ret = sta_info_move_state(sta, new_state);
void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
struct tid_ampdu_tx *tid_tx);
static inline struct tid_ampdu_tx *
rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
lockdep_is_held(&sta->lock) ||
#define STA_HASH_SIZE 256
#define STA_HASH(sta) (sta[5])
/* Maximum number of frames to buffer per power saving station per AC */
#define STA_MAX_TX_BUFFER 64
/* Minimum buffered frame expiry time. If STA uses listen interval that is
* smaller than this value, the minimum value here is used instead. */
#define STA_TX_BUFFER_EXPIRE (10 * HZ)
/* How often station data is cleaned up (e.g., expiration of buffered frames)
* Get a STA info, must be under RCU read lock.
struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
const u8 *addr);
struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
const u8 *addr);
static inline
void for_each_sta_info_type_check(struct ieee80211_local *local,
const u8 *addr,
struct sta_info *sta,
struct sta_info *nxt)
#define for_each_sta_info(local, _addr, _sta, nxt) \
for ( /* initialise loop */ \
_sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
/* typecheck */ \
for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
/* continue condition */ \
_sta; \
/* advance loop */ \
_sta = nxt, \
nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
) \
/* compare address and run code only if it matches */ \
if (ether_addr_equal(_sta->sta.addr, (_addr)))
* Get STA info by index, BROKEN!
struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
int idx);
* Create a new STA info, caller owns returned structure
* until sta_info_insert().
struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
const u8 *addr, gfp_t gfp);
void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
* Insert STA info into hash table/list, returns zero or a
* -EEXIST if (if the same MAC address is already present).
* Calling the non-rcu version makes the caller relinquish,
* the _rcu version calls read_lock_rcu() and must be called
* without it held.
int sta_info_insert(struct sta_info *sta);
int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
int __must_check __sta_info_destroy(struct sta_info *sta);
int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
const u8 *addr);
int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
const u8 *addr);
void sta_info_recalc_tim(struct sta_info *sta);
void sta_info_init(struct ieee80211_local *local);
void sta_info_stop(struct ieee80211_local *local);
int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata);
* sta_info_flush_cleanup - flush the sta_info cleanup queue
* @sdata: the interface
* Flushes the sta_info cleanup queue for a given interface;
* this is necessary before the interface is removed or, for
* AP/mesh interfaces, before it is deconfigured.
* Note an rcu_barrier() must precede the function, after all
* stations have been flushed/removed to ensure the call_rcu()
* calls that add stations to the cleanup queue have completed.
void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata);
* sta_info_flush - flush matching STA entries from the STA table
* Returns the number of removed STA entries.
* @sdata: sdata to remove all stations from
static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
int ret = sta_info_flush_defer(sdata);
return ret;
void sta_set_rate_info_tx(struct sta_info *sta,
const struct ieee80211_tx_rate *rate,
struct rate_info *rinfo);
void sta_set_rate_info_rx(struct sta_info *sta,
struct rate_info *rinfo);
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
unsigned long exp_time);
void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata);
#endif /* STA_INFO_H */