498 lines
16 KiB
C
498 lines
16 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 "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.
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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_ASSOC_AP: We're associated to that station, it is an AP.
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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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*/
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enum ieee80211_sta_info_flags {
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WLAN_STA_AUTH = 1<<0,
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WLAN_STA_ASSOC = 1<<1,
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WLAN_STA_PS_STA = 1<<2,
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WLAN_STA_AUTHORIZED = 1<<3,
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WLAN_STA_SHORT_PREAMBLE = 1<<4,
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WLAN_STA_ASSOC_AP = 1<<5,
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WLAN_STA_WME = 1<<6,
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WLAN_STA_WDS = 1<<7,
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WLAN_STA_CLEAR_PS_FILT = 1<<9,
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WLAN_STA_MFP = 1<<10,
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WLAN_STA_BLOCK_BA = 1<<11,
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WLAN_STA_PS_DRIVER = 1<<12,
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WLAN_STA_PSPOLL = 1<<13,
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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 0x3
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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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* @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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* @state: session state (see above)
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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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*
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* This structure is protected by RCU and the per-station
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* spinlock. Assignments to the array holding it must hold
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* the spinlock, only the TX path can access it under RCU
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* lock-free if, and only if, the state has the flag
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* %HT_AGG_STATE_OPERATIONAL set. Otherwise, the TX path
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* must also acquire the spinlock and re-check the state,
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* see comments in the tx code 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 addba_resp_timer;
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struct sk_buff_head pending;
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unsigned long state;
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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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};
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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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* @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 is protected by RCU and the per-station
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* spinlock. Assignments to the array holding it must hold
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* the spinlock.
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*
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* The @reorder_lock is used to protect the variables and
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* arrays such as @reorder_buf, @reorder_time, @head_seq_num,
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* @stored_mpdu_num and @reorder_time from being corrupted by
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* concurrent access of the RX path and the expired frame
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* release timer.
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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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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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* @addba_req_num: number of times addBA request has been sent.
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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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* @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 *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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/* tx */
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struct work_struct work;
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struct tid_ampdu_tx *tid_tx[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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* enum plink_state - state of a mesh peer link finite state machine
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*
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* @PLINK_LISTEN: initial state, considered the implicit state of non existant
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* mesh peer links
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* @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
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* @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
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* @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
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* peer
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* @PLINK_ESTAB: mesh peer link is established
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* @PLINK_HOLDING: mesh peer link is being closed or cancelled
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* @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
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*/
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enum plink_state {
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PLINK_LISTEN,
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PLINK_OPN_SNT,
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PLINK_OPN_RCVD,
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PLINK_CNF_RCVD,
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PLINK_ESTAB,
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PLINK_HOLDING,
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PLINK_BLOCKED
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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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* @lock: used for locking all fields that require locking, see comments
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* in the header file.
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* @flaglock: spinlock for flags accesses
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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
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* @ps_tx_buf: buffer of frames to transmit to this station
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* when it leaves power saving state
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* @tx_filtered: buffer of frames we already tried to transmit
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* but were filtered by hardware due to STA having entered
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* power saving state
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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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* @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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* @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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* @debugfs: debug filesystem info
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* @sta: station information we share with the driver
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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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*/
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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 sta_info *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 *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
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struct ieee80211_key *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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spinlock_t flaglock;
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struct work_struct drv_unblock_wk;
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u16 listen_interval;
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bool dead;
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bool uploaded;
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/*
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* frequently updated, locked with own spinlock (flaglock),
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* use the accessors defined below
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*/
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u32 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;
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struct sk_buff_head tx_filtered;
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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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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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__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
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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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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 plink_state plink_state;
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u32 plink_timeout;
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struct timer_list plink_timer;
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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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/* keep last! */
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struct ieee80211_sta sta;
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};
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static inline enum 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 PLINK_LISTEN;
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}
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static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
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{
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unsigned long irqfl;
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spin_lock_irqsave(&sta->flaglock, irqfl);
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sta->flags |= flags;
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spin_unlock_irqrestore(&sta->flaglock, irqfl);
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}
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static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
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{
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unsigned long irqfl;
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spin_lock_irqsave(&sta->flaglock, irqfl);
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sta->flags &= ~flags;
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spin_unlock_irqrestore(&sta->flaglock, irqfl);
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}
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static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
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{
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u32 ret;
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unsigned long irqfl;
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spin_lock_irqsave(&sta->flaglock, irqfl);
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ret = sta->flags & flags;
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spin_unlock_irqrestore(&sta->flaglock, irqfl);
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return ret;
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}
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static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
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const u32 flags)
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{
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u32 ret;
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unsigned long irqfl;
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spin_lock_irqsave(&sta->flaglock, irqfl);
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ret = sta->flags & flags;
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sta->flags &= ~flags;
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spin_unlock_irqrestore(&sta->flaglock, irqfl);
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return ret;
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}
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static inline u32 get_sta_flags(struct sta_info *sta)
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{
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u32 ret;
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unsigned long irqfl;
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spin_lock_irqsave(&sta->flaglock, irqfl);
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ret = sta->flags;
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spin_unlock_irqrestore(&sta->flaglock, irqfl);
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return ret;
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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 */
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#define STA_MAX_TX_BUFFER 128
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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. */
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#define STA_TX_BUFFER_EXPIRE (10 * HZ)
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/* How often station data is cleaned up (e.g., expiration of buffered frames)
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*/
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#define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
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/*
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* Get a STA info, must be under RCU read lock.
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*/
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struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
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const u8 *addr);
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struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
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const u8 *addr);
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static inline
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void for_each_sta_info_type_check(struct ieee80211_local *local,
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const u8 *addr,
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struct sta_info *sta,
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struct sta_info *nxt)
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{
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}
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#define for_each_sta_info(local, _addr, _sta, nxt) \
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for ( /* initialise loop */ \
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_sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
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nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
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/* typecheck */ \
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for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
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/* continue condition */ \
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_sta; \
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/* advance loop */ \
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_sta = nxt, \
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nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
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) \
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/* compare address and run code only if it matches */ \
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if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
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/*
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* Get STA info by index, BROKEN!
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*/
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struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
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int idx);
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/*
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* Create a new STA info, caller owns returned structure
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* until sta_info_insert().
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*/
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struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
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u8 *addr, gfp_t gfp);
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/*
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* Insert STA info into hash table/list, returns zero or a
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* -EEXIST if (if the same MAC address is already present).
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*
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* Calling the non-rcu version makes the caller relinquish,
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* the _rcu version calls read_lock_rcu() and must be called
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* without it held.
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*/
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int sta_info_insert(struct sta_info *sta);
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int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
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int sta_info_insert_atomic(struct sta_info *sta);
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int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
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const u8 *addr);
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int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
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const u8 *addr);
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void sta_info_set_tim_bit(struct sta_info *sta);
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void sta_info_clear_tim_bit(struct sta_info *sta);
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void sta_info_init(struct ieee80211_local *local);
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int sta_info_start(struct ieee80211_local *local);
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void sta_info_stop(struct ieee80211_local *local);
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int sta_info_flush(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata);
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void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
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unsigned long exp_time);
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void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
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void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
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#endif /* STA_INFO_H */
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