/*
* 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 "ieee80211_key.h"
/**
* enum ieee80211_sta_info_flags - Stations flags
*
* These flags are used with &struct sta_info's @flags member.
*
* @WLAN_STA_AUTH: Station is authenticated.
* @WLAN_STA_ASSOC: Station is associated.
* @WLAN_STA_PS: 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_ASSOC_AP: We're associated to that station, it is an AP.
* @WLAN_STA_WME: Station is a QoS-STA.
* @WLAN_STA_WDS: Station is one of our WDS peers.
* @WLAN_STA_PSPOLL: Station has just PS-polled us.
* @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
* IEEE80211_TXCTL_CLEAR_PS_FILT control flag) when the next
* frame to this station is transmitted.
*/
enum ieee80211_sta_info_flags {
WLAN_STA_AUTH = 1<<0,
WLAN_STA_ASSOC = 1<<1,
WLAN_STA_PS = 1<<2,
WLAN_STA_AUTHORIZED = 1<<3,
WLAN_STA_SHORT_PREAMBLE = 1<<4,
WLAN_STA_ASSOC_AP = 1<<5,
WLAN_STA_WME = 1<<6,
WLAN_STA_WDS = 1<<7,
WLAN_STA_PSPOLL = 1<<8,
WLAN_STA_CLEAR_PS_FILT = 1<<9,
};
#define STA_TID_NUM 16
#define ADDBA_RESP_INTERVAL HZ
#define HT_AGG_MAX_RETRIES (0x3)
#define HT_AGG_STATE_INITIATOR_SHIFT (4)
#define HT_ADDBA_REQUESTED_MSK BIT(0)
#define HT_ADDBA_DRV_READY_MSK BIT(1)
#define HT_ADDBA_RECEIVED_MSK BIT(2)
#define HT_AGG_STATE_REQ_STOP_BA_MSK BIT(3)
#define HT_AGG_STATE_INITIATOR_MSK BIT(HT_AGG_STATE_INITIATOR_SHIFT)
#define HT_AGG_STATE_IDLE (0x0)
#define HT_AGG_STATE_OPERATIONAL (HT_ADDBA_REQUESTED_MSK | \
HT_ADDBA_DRV_READY_MSK | \
HT_ADDBA_RECEIVED_MSK)
/**
* struct tid_ampdu_tx - TID aggregation information (Tx).
*
* @state: TID's state in session state machine.
* @dialog_token: dialog token for aggregation session
* @ssn: Starting Sequence Number expected to be aggregated.
* @addba_resp_timer: timer for peer's response to addba request
* @addba_req_num: number of times addBA request has been sent.
*/
struct tid_ampdu_tx {
u8 state;
u8 dialog_token;
u16 ssn;
struct timer_list addba_resp_timer;
u8 addba_req_num;
};
/**
* struct tid_ampdu_rx - TID aggregation information (Rx).
*
* @state: TID's state in session state machine.
* @dialog_token: dialog token for aggregation session
* @ssn: Starting Sequence Number expected to be aggregated.
* @buf_size: buffer size for incoming A-MPDUs
* @timeout: reset timer value.
* @head_seq_num: head sequence number in reordering buffer.
* @stored_mpdu_num: number of MPDUs in reordering buffer
* @reorder_buf: buffer to reorder incoming aggregated MPDUs
* @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
*/
struct tid_ampdu_rx {
u8 state;
u8 dialog_token;
u16 ssn;
u16 buf_size;
u16 timeout;
u16 head_seq_num;
u16 stored_mpdu_num;
struct sk_buff **reorder_buf;
struct timer_list session_timer;
};
enum plink_state {
LISTEN,
OPN_SNT,
OPN_RCVD,
CNF_RCVD,
ESTAB,
HOLDING,
BLOCKED
};
/**
* struct sta_ampdu_mlme - STA aggregation information.
*
* @tid_rx: aggregation info for Rx per TID
* @tid_tx: aggregation info for Tx per TID
* @ampdu_rx: for locking sections in aggregation Rx flow
* @ampdu_tx: for locking sectionsi in aggregation Tx flow
* @dialog_token_allocator: dialog token enumerator for each new session;
*/
struct sta_ampdu_mlme {
struct tid_ampdu_rx tid_rx[STA_TID_NUM];
struct tid_ampdu_tx tid_tx[STA_TID_NUM];
spinlock_t ampdu_rx;
spinlock_t ampdu_tx;
u8 dialog_token_allocator;
};
/* see __sta_info_unlink */
#define STA_INFO_PIN_STAT_NORMAL 0
#define STA_INFO_PIN_STAT_PINNED 1
#define STA_INFO_PIN_STAT_DESTROY 2
/**
* 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
* @addr: MAC address of this STA
* @aid: STA's unique AID (1..2007, 0 = not assigned yet),
* only used in AP (and IBSS?) mode
* @flags: STA flags, see &enum ieee80211_sta_info_flags
* @ps_tx_buf: buffer of frames to transmit to this station
* when it leaves power saving state
* @tx_filtered: buffer of frames we already tried to transmit
* but were filtered by hardware due to STA having entered
* power saving state
* @rx_packets: Number of MSDUs received from this STA
* @rx_bytes: Number of bytes received from this STA
* @supp_rates: Bitmap of supported rates (per band)
* @ht_info: HT capabilities of this STA
*/
struct sta_info {
/* General information, mostly static */
struct list_head list;
struct sta_info *hnext;
struct ieee80211_local *local;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_key *key;
struct rate_control_ref *rate_ctrl;
void *rate_ctrl_priv;
struct ieee80211_ht_info ht_info;
u64 supp_rates[IEEE80211_NUM_BANDS];
u8 addr[ETH_ALEN];
u16 aid;
u16 listen_interval;
/*
* for use by the internal lifetime management,
* see __sta_info_unlink
*/
u8 pin_status;
/* frequently updated information, needs locking? */
u32 flags;
/*
* STA powersave frame queues, no more than the internal
* locking required.
*/
struct sk_buff_head ps_tx_buf;
struct sk_buff_head tx_filtered;
/* Updated from RX path only, no locking requirements */
unsigned long rx_packets, rx_bytes;
unsigned long wep_weak_iv_count;
unsigned long last_rx;
unsigned long num_duplicates; /* number of duplicate frames received
* from this STA */
unsigned long rx_fragments; /* number of received MPDUs */
unsigned long rx_dropped; /* number of dropped MPDUs from this STA */
int last_rssi; /* RSSI of last received frame from this STA */
int last_signal; /* signal of last received frame from this STA */
int last_noise; /* noise of last received frame from this STA */
/* last received seq/frag number from this STA (per RX queue) */
__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
unsigned int wme_rx_queue[NUM_RX_DATA_QUEUES];
#endif
/* Updated from TX status path only, no locking requirements */
unsigned long tx_filtered_count;
unsigned long tx_retry_failed, tx_retry_count;
/* TODO: update in generic code not rate control? */
u32 tx_num_consecutive_failures;
u32 tx_num_mpdu_ok;
u32 tx_num_mpdu_fail;
/* moving percentage of failed MSDUs */
unsigned int fail_avg;
/* Updated from TX path only, no locking requirements */
unsigned long tx_packets; /* number of RX/TX MSDUs */
unsigned long tx_bytes;
unsigned long tx_fragments; /* number of transmitted MPDUs */
int txrate_idx;
int last_txrate_idx;
#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
unsigned int wme_tx_queue[NUM_RX_DATA_QUEUES];
#endif
/* Debug counters, no locking doesn't matter */
int channel_use;
int channel_use_raw;
/*
* Aggregation information, comes with own locking.
*/
struct sta_ampdu_mlme ampdu_mlme;
u8 timer_to_tid[STA_TID_NUM]; /* identity mapping to ID timers */
u8 tid_to_tx_q[STA_TID_NUM]; /* map tid to tx queue */
#ifdef CONFIG_MAC80211_MESH
/*
* Mesh peer link attributes
* TODO: move to a sub-structure that is referenced with pointer?
*/
__le16 llid; /* Local link ID */
__le16 plid; /* Peer link ID */
__le16 reason; /* Buffer for cancel reason on HOLDING state */
u8 plink_retries; /* Retries in establishment */
bool ignore_plink_timer;
enum plink_state plink_state;
u32 plink_timeout;
struct timer_list plink_timer;
spinlock_t plink_lock; /* For peer_state reads / updates and other
updates in the structure. Ensures robust
transitions for the peerlink FSM */
#endif
#ifdef CONFIG_MAC80211_DEBUGFS
struct sta_info_debugfsdentries {
struct dentry *dir;
struct dentry *flags;
struct dentry *num_ps_buf_frames;
struct dentry *inactive_ms;
struct dentry *last_seq_ctrl;
#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
struct dentry *wme_rx_queue;
struct dentry *wme_tx_queue;
#endif
struct dentry *agg_status;
} debugfs;
#endif
};
static inline enum plink_state sta_plink_state(struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_MESH
return sta->plink_state;
#endif
return LISTEN;
}
/* Maximum number of concurrently registered stations */
#define MAX_STA_COUNT 2007
#define STA_HASH_SIZE 256
#define STA_HASH(sta) (sta[5])
/* Maximum number of frames to buffer per power saving station */
#define STA_MAX_TX_BUFFER 128
/* 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 have be under RCU read lock.
*/
struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr);
/*
* Get STA info by index, BROKEN!
*/
struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
struct net_device *dev);
/*
* 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 this without RCU protection makes the caller
* relinquish its reference to @sta.
*/
int sta_info_insert(struct sta_info *sta);
/*
* Unlink a STA info from the hash table/list.
* This can NULL the STA pointer if somebody else
* has already unlinked it.
*/
void sta_info_unlink(struct sta_info **sta);
void sta_info_destroy(struct sta_info *sta);
void sta_info_set_tim_bit(struct sta_info *sta);
void sta_info_clear_tim_bit(struct sta_info *sta);
void sta_info_init(struct ieee80211_local *local);
int sta_info_start(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);
#endif /* STA_INFO_H */
