/* * 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 "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_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_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_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_SUSPEND: Set/cleared during a suspend/resume cycle. * Used to deny ADDBA requests (both TX and RX). * @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. */ enum ieee80211_sta_info_flags { WLAN_STA_AUTH = 1<<0, WLAN_STA_ASSOC = 1<<1, WLAN_STA_PS_STA = 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_CLEAR_PS_FILT = 1<<9, WLAN_STA_MFP = 1<<10, WLAN_STA_SUSPEND = 1<<11, WLAN_STA_PS_DRIVER = 1<<12, WLAN_STA_PSPOLL = 1<<13, }; #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). * * @addba_resp_timer: timer for peer's response to addba request * @pending: pending frames queue -- use sta's spinlock to protect * @ssn: Starting Sequence Number expected to be aggregated. * @dialog_token: dialog token for aggregation session */ struct tid_ampdu_tx { struct timer_list addba_resp_timer; struct sk_buff_head pending; u16 ssn; u8 dialog_token; }; /** * 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) * @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 * @shutdown: this session is being shut down due to STA removal */ struct tid_ampdu_rx { struct sk_buff **reorder_buf; unsigned long *reorder_time; struct timer_list session_timer; u16 head_seq_num; u16 stored_mpdu_num; u16 ssn; u16 buf_size; u16 timeout; u8 dialog_token; bool shutdown; }; /** * enum plink_state - state of a mesh peer link finite state machine * * @PLINK_LISTEN: initial state, considered the implicit state of non existant * mesh peer links * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh * peer * @PLINK_ESTAB: mesh peer link is established * @PLINK_HOLDING: mesh peer link is being closed or cancelled * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded */ enum plink_state { PLINK_LISTEN, PLINK_OPN_SNT, PLINK_OPN_RCVD, PLINK_CNF_RCVD, PLINK_ESTAB, PLINK_HOLDING, PLINK_BLOCKED }; /** * struct sta_ampdu_mlme - STA aggregation information. * * @tid_state_rx: TID's state in Rx session state machine. * @tid_rx: aggregation info for Rx per TID * @tid_state_tx: TID's state in Tx session state machine. * @tid_tx: aggregation info for Tx per TID * @addba_req_num: number of times addBA request has been sent. * @dialog_token_allocator: dialog token enumerator for each new session; */ struct sta_ampdu_mlme { /* rx */ u8 tid_state_rx[STA_TID_NUM]; struct tid_ampdu_rx *tid_rx[STA_TID_NUM]; /* tx */ u8 tid_state_tx[STA_TID_NUM]; struct tid_ampdu_tx *tid_tx[STA_TID_NUM]; u8 addba_req_num[STA_TID_NUM]; 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 * @sdata: virtual interface this station belongs to * @key: peer key 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 * @lock: used for locking all fields that require locking, see comments * in the header file. * @flaglock: spinlock for flags accesses * @drv_unblock_wk: used for driver PS unblocking * @listen_interval: listen interval of this station, when we're acting as AP * @pin_status: used internally for pinning a STA struct into memory * @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 * @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 * @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 * @last_noise: noise of last received 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 * @plink_timer_was_running: used by suspend/resume to restore timers * @debugfs: debug filesystem info * @sta: station information we share with the driver * @dead: set to true when sta is unlinked */ 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; spinlock_t lock; spinlock_t flaglock; struct work_struct drv_unblock_wk; u16 listen_interval; bool dead; /* * for use by the internal lifetime management, * see __sta_info_unlink */ u8 pin_status; /* * frequently updated, locked with own spinlock (flaglock), * use the accessors defined below */ 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; unsigned long rx_fragments; unsigned long rx_dropped; int last_signal; int last_noise; __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES]; /* 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; 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 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 /* keep last! */ struct ieee80211_sta sta; }; static inline enum plink_state sta_plink_state(struct sta_info *sta) { #ifdef CONFIG_MAC80211_MESH return sta->plink_state; #endif return PLINK_LISTEN; } static inline void set_sta_flags(struct sta_info *sta, const u32 flags) { unsigned long irqfl; spin_lock_irqsave(&sta->flaglock, irqfl); sta->flags |= flags; spin_unlock_irqrestore(&sta->flaglock, irqfl); } static inline void clear_sta_flags(struct sta_info *sta, const u32 flags) { unsigned long irqfl; spin_lock_irqsave(&sta->flaglock, irqfl); sta->flags &= ~flags; spin_unlock_irqrestore(&sta->flaglock, irqfl); } static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags) { u32 ret; unsigned long irqfl; spin_lock_irqsave(&sta->flaglock, irqfl); ret = sta->flags & flags; spin_unlock_irqrestore(&sta->flaglock, irqfl); return ret; } static inline u32 test_and_clear_sta_flags(struct sta_info *sta, const u32 flags) { u32 ret; unsigned long irqfl; spin_lock_irqsave(&sta->flaglock, irqfl); ret = sta->flags & flags; sta->flags &= ~flags; spin_unlock_irqrestore(&sta->flaglock, irqfl); return ret; } static inline u32 get_sta_flags(struct sta_info *sta) { u32 ret; unsigned long irqfl; spin_lock_irqsave(&sta->flaglock, irqfl); ret = sta->flags; spin_unlock_irqrestore(&sta->flaglock, irqfl); return ret; } #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, const u8 *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, 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); 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); #endif /* STA_INFO_H */