524 lines
17 KiB
C
524 lines
17 KiB
C
/*
|
|
* 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 "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.
|
|
*/
|
|
enum ieee80211_sta_info_flags {
|
|
WLAN_STA_AUTH,
|
|
WLAN_STA_ASSOC,
|
|
WLAN_STA_PS_STA,
|
|
WLAN_STA_AUTHORIZED,
|
|
WLAN_STA_SHORT_PREAMBLE,
|
|
WLAN_STA_WME,
|
|
WLAN_STA_WDS,
|
|
WLAN_STA_CLEAR_PS_FILT,
|
|
WLAN_STA_MFP,
|
|
WLAN_STA_BLOCK_BA,
|
|
WLAN_STA_PS_DRIVER,
|
|
WLAN_STA_PSPOLL,
|
|
WLAN_STA_TDLS_PEER,
|
|
WLAN_STA_TDLS_PEER_AUTH,
|
|
WLAN_STA_UAPSD,
|
|
WLAN_STA_SP,
|
|
WLAN_STA_4ADDR_EVENT,
|
|
};
|
|
|
|
#define STA_TID_NUM 16
|
|
#define ADDBA_RESP_INTERVAL HZ
|
|
#define HT_AGG_MAX_RETRIES 0x3
|
|
|
|
#define HT_AGG_STATE_DRV_READY 0
|
|
#define HT_AGG_STATE_RESPONSE_RECEIVED 1
|
|
#define HT_AGG_STATE_OPERATIONAL 2
|
|
#define HT_AGG_STATE_STOPPING 3
|
|
#define HT_AGG_STATE_WANT_START 4
|
|
#define HT_AGG_STATE_WANT_STOP 5
|
|
|
|
/**
|
|
* 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)
|
|
* @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;
|
|
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.
|
|
* @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;
|
|
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.
|
|
* @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)
|
|
*/
|
|
struct sta_ampdu_mlme {
|
|
struct mutex mtx;
|
|
/* rx */
|
|
struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
|
|
unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
|
|
unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
|
|
/* tx */
|
|
struct work_struct work;
|
|
struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
|
|
struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
|
|
u8 addba_req_num[STA_TID_NUM];
|
|
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
|
|
* @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_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
|
|
* @plink_timer_was_running: used by suspend/resume to restore timers
|
|
* @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
|
|
* @dummy: indicate a dummy station created for receiving
|
|
* EAP frames before association
|
|
* @sta: station information we share with the driver
|
|
*/
|
|
struct sta_info {
|
|
/* General information, mostly static */
|
|
struct list_head list;
|
|
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;
|
|
|
|
/* 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, 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;
|
|
/* Plus 1 for non-QoS frames */
|
|
__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 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 */
|
|
unsigned long tx_packets;
|
|
unsigned long tx_bytes;
|
|
unsigned long tx_fragments;
|
|
struct ieee80211_tx_rate last_tx_rate;
|
|
int last_rx_rate_idx;
|
|
int last_rx_rate_flag;
|
|
u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
|
|
|
|
/*
|
|
* Aggregation information, locked with lock.
|
|
*/
|
|
struct sta_ampdu_mlme ampdu_mlme;
|
|
u8 timer_to_tid[STA_TID_NUM];
|
|
|
|
#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;
|
|
bool plink_timer_was_running;
|
|
enum nl80211_plink_state plink_state;
|
|
u32 plink_timeout;
|
|
struct timer_list plink_timer;
|
|
#endif
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
struct sta_info_debugfsdentries {
|
|
struct dentry *dir;
|
|
bool add_has_run;
|
|
} debugfs;
|
|
#endif
|
|
|
|
unsigned int lost_packets;
|
|
|
|
/* should be right in front of sta to be in the same cache line */
|
|
bool dummy;
|
|
|
|
/* 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;
|
|
#endif
|
|
return NL80211_PLINK_LISTEN;
|
|
}
|
|
|
|
static inline void set_sta_flag(struct sta_info *sta,
|
|
enum ieee80211_sta_info_flags flag)
|
|
{
|
|
set_bit(flag, &sta->_flags);
|
|
}
|
|
|
|
static inline void clear_sta_flag(struct sta_info *sta,
|
|
enum ieee80211_sta_info_flags flag)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
return test_and_set_bit(flag, &sta->_flags);
|
|
}
|
|
|
|
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) ||
|
|
lockdep_is_held(&sta->ampdu_mlme.mtx));
|
|
}
|
|
|
|
#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)
|
|
*/
|
|
#define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
|
|
|
|
/*
|
|
* 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_rx(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);
|
|
|
|
struct sta_info *sta_info_get_bss_rx(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 \
|
|
) \
|
|
/* run code only if address matches and it's not a dummy sta */ \
|
|
if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0 && \
|
|
!_sta->dummy)
|
|
|
|
#define for_each_sta_info_rx(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 (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
|
|
|
|
/*
|
|
* 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,
|
|
u8 *addr, gfp_t gfp);
|
|
/*
|
|
* 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 sta_info_insert_atomic(struct sta_info *sta);
|
|
int sta_info_reinsert(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(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata);
|
|
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);
|
|
|
|
#endif /* STA_INFO_H */
|