562 lines
19 KiB
C
562 lines
19 KiB
C
/*
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* Copyright 2002-2005, Devicescape Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef STA_INFO_H
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#define STA_INFO_H
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/if_ether.h>
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#include <linux/workqueue.h>
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#include <linux/average.h>
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#include <linux/etherdevice.h>
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#include "key.h"
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/**
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* enum ieee80211_sta_info_flags - Stations flags
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*
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* These flags are used with &struct sta_info's @flags member, but
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* only indirectly with set_sta_flag() and friends.
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*
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* @WLAN_STA_AUTH: Station is authenticated.
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* @WLAN_STA_ASSOC: Station is associated.
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* @WLAN_STA_PS_STA: Station is in power-save mode
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* @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
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* This bit is always checked so needs to be enabled for all stations
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* when virtual port control is not in use.
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* @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
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* frames.
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* @WLAN_STA_WME: Station is a QoS-STA.
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* @WLAN_STA_WDS: Station is one of our WDS peers.
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* @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
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* IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
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* frame to this station is transmitted.
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* @WLAN_STA_MFP: Management frame protection is used with this STA.
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* @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
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* during suspend/resume and station removal.
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* @WLAN_STA_PS_DRIVER: driver requires keeping this station in
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* power-save mode logically to flush frames that might still
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* be in the queues
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* @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
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* station in power-save mode, reply when the driver unblocks.
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* @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
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* @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
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* packets. This means the link is enabled.
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* @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
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* keeping station in power-save mode, reply when the driver
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* unblocks the station.
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* @WLAN_STA_SP: Station is in a service period, so don't try to
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* reply to other uAPSD trigger frames or PS-Poll.
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* @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
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* @WLAN_STA_INSERTED: This station is inserted into the hash table.
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* @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
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* @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
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*/
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enum ieee80211_sta_info_flags {
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WLAN_STA_AUTH,
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WLAN_STA_ASSOC,
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WLAN_STA_PS_STA,
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WLAN_STA_AUTHORIZED,
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WLAN_STA_SHORT_PREAMBLE,
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WLAN_STA_WME,
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WLAN_STA_WDS,
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WLAN_STA_CLEAR_PS_FILT,
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WLAN_STA_MFP,
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WLAN_STA_BLOCK_BA,
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WLAN_STA_PS_DRIVER,
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WLAN_STA_PSPOLL,
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WLAN_STA_TDLS_PEER,
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WLAN_STA_TDLS_PEER_AUTH,
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WLAN_STA_UAPSD,
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WLAN_STA_SP,
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WLAN_STA_4ADDR_EVENT,
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WLAN_STA_INSERTED,
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WLAN_STA_RATE_CONTROL,
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WLAN_STA_TOFFSET_KNOWN,
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};
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#define STA_TID_NUM 16
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#define ADDBA_RESP_INTERVAL HZ
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#define HT_AGG_MAX_RETRIES 15
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#define HT_AGG_BURST_RETRIES 3
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#define HT_AGG_RETRIES_PERIOD (15 * HZ)
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#define HT_AGG_STATE_DRV_READY 0
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#define HT_AGG_STATE_RESPONSE_RECEIVED 1
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#define HT_AGG_STATE_OPERATIONAL 2
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#define HT_AGG_STATE_STOPPING 3
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#define HT_AGG_STATE_WANT_START 4
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#define HT_AGG_STATE_WANT_STOP 5
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/**
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* struct tid_ampdu_tx - TID aggregation information (Tx).
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*
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* @rcu_head: rcu head for freeing structure
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* @session_timer: check if we keep Tx-ing on the TID (by timeout value)
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* @addba_resp_timer: timer for peer's response to addba request
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* @pending: pending frames queue -- use sta's spinlock to protect
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* @dialog_token: dialog token for aggregation session
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* @timeout: session timeout value to be filled in ADDBA requests
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* @state: session state (see above)
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* @last_tx: jiffies of last tx activity
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* @stop_initiator: initiator of a session stop
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* @tx_stop: TX DelBA frame when stopping
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* @buf_size: reorder buffer size at receiver
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* @failed_bar_ssn: ssn of the last failed BAR tx attempt
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* @bar_pending: BAR needs to be re-sent
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*
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* This structure's lifetime is managed by RCU, assignments to
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* the array holding it must hold the aggregation mutex.
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*
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* The TX path can access it under RCU lock-free if, and
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* only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
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* set. Otherwise, the TX path must also acquire the spinlock
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* and re-check the state, see comments in the tx code
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* touching it.
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*/
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struct tid_ampdu_tx {
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struct rcu_head rcu_head;
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struct timer_list session_timer;
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struct timer_list addba_resp_timer;
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struct sk_buff_head pending;
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unsigned long state;
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unsigned long last_tx;
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u16 timeout;
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u8 dialog_token;
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u8 stop_initiator;
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bool tx_stop;
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u8 buf_size;
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u16 failed_bar_ssn;
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bool bar_pending;
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};
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/**
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* struct tid_ampdu_rx - TID aggregation information (Rx).
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*
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* @reorder_buf: buffer to reorder incoming aggregated MPDUs
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* @reorder_time: jiffies when skb was added
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* @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
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* @reorder_timer: releases expired frames from the reorder buffer.
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* @last_rx: jiffies of last rx activity
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* @head_seq_num: head sequence number in reordering buffer.
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* @stored_mpdu_num: number of MPDUs in reordering buffer
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* @ssn: Starting Sequence Number expected to be aggregated.
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* @buf_size: buffer size for incoming A-MPDUs
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* @timeout: reset timer value (in TUs).
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* @dialog_token: dialog token for aggregation session
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* @rcu_head: RCU head used for freeing this struct
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* @reorder_lock: serializes access to reorder buffer, see below.
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*
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* This structure's lifetime is managed by RCU, assignments to
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* the array holding it must hold the aggregation mutex.
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*
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* The @reorder_lock is used to protect the members of this
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* struct, except for @timeout, @buf_size and @dialog_token,
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* which are constant across the lifetime of the struct (the
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* dialog token being used only for debugging).
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*/
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struct tid_ampdu_rx {
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struct rcu_head rcu_head;
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spinlock_t reorder_lock;
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struct sk_buff **reorder_buf;
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unsigned long *reorder_time;
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struct timer_list session_timer;
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struct timer_list reorder_timer;
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unsigned long last_rx;
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u16 head_seq_num;
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u16 stored_mpdu_num;
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u16 ssn;
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u16 buf_size;
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u16 timeout;
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u8 dialog_token;
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};
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/**
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* struct sta_ampdu_mlme - STA aggregation information.
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*
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* @tid_rx: aggregation info for Rx per TID -- RCU protected
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* @tid_tx: aggregation info for Tx per TID
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* @tid_start_tx: sessions where start was requested
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* @addba_req_num: number of times addBA request has been sent.
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* @last_addba_req_time: timestamp of the last addBA request.
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* @dialog_token_allocator: dialog token enumerator for each new session;
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* @work: work struct for starting/stopping aggregation
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* @tid_rx_timer_expired: bitmap indicating on which TIDs the
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* RX timer expired until the work for it runs
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* @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the
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* driver requested to close until the work for it runs
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* @mtx: mutex to protect all TX data (except non-NULL assignments
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* to tid_tx[idx], which are protected by the sta spinlock)
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*/
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struct sta_ampdu_mlme {
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struct mutex mtx;
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/* rx */
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struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
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unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
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unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
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/* tx */
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struct work_struct work;
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struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
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struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
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unsigned long last_addba_req_time[STA_TID_NUM];
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u8 addba_req_num[STA_TID_NUM];
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u8 dialog_token_allocator;
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};
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/**
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* struct sta_info - STA information
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*
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* This structure collects information about a station that
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* mac80211 is communicating with.
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*
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* @list: global linked list entry
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* @hnext: hash table linked list pointer
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* @local: pointer to the global information
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* @sdata: virtual interface this station belongs to
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* @ptk: peer key negotiated with this station, if any
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* @gtk: group keys negotiated with this station, if any
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* @rate_ctrl: rate control algorithm reference
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* @rate_ctrl_priv: rate control private per-STA pointer
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* @last_tx_rate: rate used for last transmit, to report to userspace as
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* "the" transmit rate
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* @last_rx_rate_idx: rx status rate index of the last data packet
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* @last_rx_rate_flag: rx status flag of the last data packet
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* @lock: used for locking all fields that require locking, see comments
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* in the header file.
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* @drv_unblock_wk: used for driver PS unblocking
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* @listen_interval: listen interval of this station, when we're acting as AP
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* @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
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* @ps_tx_buf: buffers (per AC) of frames to transmit to this station
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* when it leaves power saving state or polls
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* @tx_filtered: buffers (per AC) of frames we already tried to
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* transmit but were filtered by hardware due to STA having
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* entered power saving state, these are also delivered to
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* the station when it leaves powersave or polls for frames
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* @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
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* @rx_packets: Number of MSDUs received from this STA
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* @rx_bytes: Number of bytes received from this STA
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* @wep_weak_iv_count: number of weak WEP IVs received from this station
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* @last_rx: time (in jiffies) when last frame was received from this STA
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* @last_connected: time (in seconds) when a station got connected
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* @num_duplicates: number of duplicate frames received from this STA
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* @rx_fragments: number of received MPDUs
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* @rx_dropped: number of dropped MPDUs from this STA
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* @last_signal: signal of last received frame from this STA
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* @avg_signal: moving average of signal of received frames from this STA
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* @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
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* @tx_filtered_count: number of frames the hardware filtered for this STA
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* @tx_retry_failed: number of frames that failed retry
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* @tx_retry_count: total number of retries for frames to this STA
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* @fail_avg: moving percentage of failed MSDUs
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* @tx_packets: number of RX/TX MSDUs
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* @tx_bytes: number of bytes transmitted to this STA
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* @tx_fragments: number of transmitted MPDUs
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* @tid_seq: per-TID sequence numbers for sending to this STA
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* @ampdu_mlme: A-MPDU state machine state
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* @timer_to_tid: identity mapping to ID timers
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* @llid: Local link ID
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* @plid: Peer link ID
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* @reason: Cancel reason on PLINK_HOLDING state
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* @plink_retries: Retries in establishment
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* @ignore_plink_timer: ignore the peer-link timer (used internally)
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* @plink_state: peer link state
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* @plink_timeout: timeout of peer link
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* @plink_timer: peer link watch timer
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* @plink_timer_was_running: used by suspend/resume to restore timers
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* @t_offset: timing offset relative to this host
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* @t_offset_setpoint: reference timing offset of this sta to be used when
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* calculating clockdrift
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* @ch_type: peer's channel type
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* @debugfs: debug filesystem info
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* @dead: set to true when sta is unlinked
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* @uploaded: set to true when sta is uploaded to the driver
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* @lost_packets: number of consecutive lost packets
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* @sta: station information we share with the driver
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* @sta_state: duplicates information about station state (for debug)
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* @beacon_loss_count: number of times beacon loss has triggered
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* @supports_40mhz: tracks whether the station advertised 40 MHz support
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* as we overwrite its HT parameters with the currently used value
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*/
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struct sta_info {
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/* General information, mostly static */
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struct list_head list;
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struct rcu_head rcu_head;
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struct sta_info __rcu *hnext;
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struct ieee80211_local *local;
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
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struct ieee80211_key __rcu *ptk;
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struct rate_control_ref *rate_ctrl;
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void *rate_ctrl_priv;
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spinlock_t lock;
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struct work_struct drv_unblock_wk;
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struct work_struct free_sta_wk;
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u16 listen_interval;
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bool dead;
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bool uploaded;
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enum ieee80211_sta_state sta_state;
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/* use the accessors defined below */
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unsigned long _flags;
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/*
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* STA powersave frame queues, no more than the internal
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* locking required.
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*/
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struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
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struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
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unsigned long driver_buffered_tids;
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/* Updated from RX path only, no locking requirements */
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unsigned long rx_packets, rx_bytes;
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unsigned long wep_weak_iv_count;
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unsigned long last_rx;
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long last_connected;
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unsigned long num_duplicates;
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unsigned long rx_fragments;
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unsigned long rx_dropped;
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int last_signal;
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struct ewma avg_signal;
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/* Plus 1 for non-QoS frames */
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__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 1];
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/* Updated from TX status path only, no locking requirements */
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unsigned long tx_filtered_count;
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unsigned long tx_retry_failed, tx_retry_count;
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/* moving percentage of failed MSDUs */
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unsigned int fail_avg;
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/* Updated from TX path only, no locking requirements */
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unsigned long tx_packets;
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unsigned long tx_bytes;
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unsigned long tx_fragments;
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struct ieee80211_tx_rate last_tx_rate;
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int last_rx_rate_idx;
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int last_rx_rate_flag;
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u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
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/*
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* Aggregation information, locked with lock.
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*/
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struct sta_ampdu_mlme ampdu_mlme;
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u8 timer_to_tid[STA_TID_NUM];
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#ifdef CONFIG_MAC80211_MESH
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/*
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* Mesh peer link attributes
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* TODO: move to a sub-structure that is referenced with pointer?
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*/
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__le16 llid;
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__le16 plid;
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__le16 reason;
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u8 plink_retries;
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bool ignore_plink_timer;
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bool plink_timer_was_running;
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enum nl80211_plink_state plink_state;
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u32 plink_timeout;
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struct timer_list plink_timer;
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s64 t_offset;
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s64 t_offset_setpoint;
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enum nl80211_channel_type ch_type;
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#endif
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct sta_info_debugfsdentries {
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struct dentry *dir;
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bool add_has_run;
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} debugfs;
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#endif
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unsigned int lost_packets;
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unsigned int beacon_loss_count;
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bool supports_40mhz;
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/* keep last! */
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struct ieee80211_sta sta;
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};
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static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
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{
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#ifdef CONFIG_MAC80211_MESH
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return sta->plink_state;
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#endif
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return NL80211_PLINK_LISTEN;
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}
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static inline void set_sta_flag(struct sta_info *sta,
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enum ieee80211_sta_info_flags flag)
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{
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WARN_ON(flag == WLAN_STA_AUTH ||
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flag == WLAN_STA_ASSOC ||
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flag == WLAN_STA_AUTHORIZED);
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set_bit(flag, &sta->_flags);
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}
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static inline void clear_sta_flag(struct sta_info *sta,
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enum ieee80211_sta_info_flags flag)
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{
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WARN_ON(flag == WLAN_STA_AUTH ||
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flag == WLAN_STA_ASSOC ||
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flag == WLAN_STA_AUTHORIZED);
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clear_bit(flag, &sta->_flags);
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}
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static inline int test_sta_flag(struct sta_info *sta,
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enum ieee80211_sta_info_flags flag)
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{
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return test_bit(flag, &sta->_flags);
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}
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static inline int test_and_clear_sta_flag(struct sta_info *sta,
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enum ieee80211_sta_info_flags flag)
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{
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WARN_ON(flag == WLAN_STA_AUTH ||
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flag == WLAN_STA_ASSOC ||
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flag == WLAN_STA_AUTHORIZED);
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return test_and_clear_bit(flag, &sta->_flags);
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}
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static inline int test_and_set_sta_flag(struct sta_info *sta,
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enum ieee80211_sta_info_flags flag)
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{
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WARN_ON(flag == WLAN_STA_AUTH ||
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flag == WLAN_STA_ASSOC ||
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flag == WLAN_STA_AUTHORIZED);
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return test_and_set_bit(flag, &sta->_flags);
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}
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int sta_info_move_state(struct sta_info *sta,
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enum ieee80211_sta_state new_state);
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static inline void sta_info_pre_move_state(struct sta_info *sta,
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enum ieee80211_sta_state new_state)
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{
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int ret;
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WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
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ret = sta_info_move_state(sta, new_state);
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WARN_ON_ONCE(ret);
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}
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void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
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struct tid_ampdu_tx *tid_tx);
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static inline struct tid_ampdu_tx *
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rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
|
|
{
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|
return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
|
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lockdep_is_held(&sta->lock) ||
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|
lockdep_is_held(&sta->ampdu_mlme.mtx));
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}
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|
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|
#define STA_HASH_SIZE 256
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|
#define STA_HASH(sta) (sta[5])
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|
|
|
|
|
/* Maximum number of frames to buffer per power saving station per AC */
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|
#define STA_MAX_TX_BUFFER 64
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|
|
|
/* Minimum buffered frame expiry time. If STA uses listen interval that is
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|
* smaller than this value, the minimum value here is used instead. */
|
|
#define STA_TX_BUFFER_EXPIRE (10 * HZ)
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|
|
|
/* How often station data is cleaned up (e.g., expiration of buffered frames)
|
|
*/
|
|
#define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
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|
|
|
/*
|
|
* 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);
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|
|
|
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(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata);
|
|
void sta_set_rate_info_tx(struct sta_info *sta,
|
|
const struct ieee80211_tx_rate *rate,
|
|
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);
|
|
|
|
#endif /* STA_INFO_H */
|