net/mac80211/sta_info.h

   1 /*
   2  * Copyright 2002-2005, Devicescape Software, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef STA_INFO_H
  10 #define STA_INFO_H
  11
  12 #include <linux/list.h>
  13 #include <linux/types.h>
  14 #include <linux/if_ether.h>
  15 #include <linux/kref.h>
  16 #include "ieee80211_key.h"
  17
  18 /**
  19  * enum ieee80211_sta_info_flags - Stations flags
  20  *
  21  * These flags are used with &struct sta_info's @flags member.
  22  *
  23  * @WLAN_STA_AUTH: Station is authenticated.
  24  * @WLAN_STA_ASSOC: Station is associated.
  25  * @WLAN_STA_PS: Station is in power-save mode
  26  * @WLAN_STA_TIM: TIM bit is on for this PS station (traffic buffered)
  27  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
  28  *      This bit is always checked so needs to be enabled for all stations
  29  *      when virtual port control is not in use.
  30  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
  31  *      frames.
  32  * @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
  33  * @WLAN_STA_WME: Station is a QoS-STA.
  34  * @WLAN_STA_WDS: Station is one of our WDS peers.
  35  * @WLAN_STA_PSPOLL: Station has just PS-polled us.
  36  */
  37 enum ieee80211_sta_info_flags {
  38         WLAN_STA_AUTH           = 1<<0,
  39         WLAN_STA_ASSOC          = 1<<1,
  40         WLAN_STA_PS             = 1<<2,
  41         WLAN_STA_TIM            = 1<<3,
  42         WLAN_STA_AUTHORIZED     = 1<<4,
  43         WLAN_STA_SHORT_PREAMBLE = 1<<5,
  44         WLAN_STA_ASSOC_AP       = 1<<6,
  45         WLAN_STA_WME            = 1<<7,
  46         WLAN_STA_WDS            = 1<<8,
  47         WLAN_STA_PSPOLL         = 1<<9,
  48 };
  49
  50 #define STA_TID_NUM 16
  51 #define ADDBA_RESP_INTERVAL HZ
  52 #define HT_AGG_MAX_RETRIES              (0x3)
  53
  54 #define HT_AGG_STATE_INITIATOR_SHIFT    (4)
  55
  56 #define HT_ADDBA_REQUESTED_MSK          BIT(0)
  57 #define HT_ADDBA_DRV_READY_MSK          BIT(1)
  58 #define HT_ADDBA_RECEIVED_MSK           BIT(2)
  59 #define HT_AGG_STATE_REQ_STOP_BA_MSK    BIT(3)
  60 #define HT_AGG_STATE_INITIATOR_MSK      BIT(HT_AGG_STATE_INITIATOR_SHIFT)
  61 #define HT_AGG_STATE_IDLE               (0x0)
  62 #define HT_AGG_STATE_OPERATIONAL        (HT_ADDBA_REQUESTED_MSK |       \
  63                                          HT_ADDBA_DRV_READY_MSK |       \
  64                                          HT_ADDBA_RECEIVED_MSK)
  65
  66 /**
  67  * struct tid_ampdu_tx - TID aggregation information (Tx).
  68  *
  69  * @state: TID's state in session state machine.
  70  * @dialog_token: dialog token for aggregation session
  71  * @ssn: Starting Sequence Number expected to be aggregated.
  72  * @addba_resp_timer: timer for peer's response to addba request
  73  * @addba_req_num: number of times addBA request has been sent.
  74  */
  75 struct tid_ampdu_tx {
  76         u8 state;
  77         u8 dialog_token;
  78         u16 ssn;
  79         struct timer_list addba_resp_timer;
  80         u8 addba_req_num;
  81 };
  82
  83 /**
  84  * struct tid_ampdu_rx - TID aggregation information (Rx).
  85  *
  86  * @state: TID's state in session state machine.
  87  * @dialog_token: dialog token for aggregation session
  88  * @ssn: Starting Sequence Number expected to be aggregated.
  89  * @buf_size: buffer size for incoming A-MPDUs
  90  * @timeout: reset timer value.
  91  * @head_seq_num: head sequence number in reordering buffer.
  92  * @stored_mpdu_num: number of MPDUs in reordering buffer
  93  * @reorder_buf: buffer to reorder incoming aggregated MPDUs
  94  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
  95  */
  96 struct tid_ampdu_rx {
  97         u8 state;
  98         u8 dialog_token;
  99         u16 ssn;
 100         u16 buf_size;
 101         u16 timeout;
 102         u16 head_seq_num;
 103         u16 stored_mpdu_num;
 104         struct sk_buff **reorder_buf;
 105         struct timer_list session_timer;
 106 };
 107
 108 /**
 109  * struct sta_ampdu_mlme - STA aggregation information.
 110  *
 111  * @tid_rx: aggregation info for Rx per TID
 112  * @tid_tx: aggregation info for Tx per TID
 113  * @ampdu_rx: for locking sections in aggregation Rx flow
 114  * @ampdu_tx: for locking sectionsi in aggregation Tx flow
 115  * @dialog_token_allocator: dialog token enumerator for each new session;
 116  */
 117 struct sta_ampdu_mlme {
 118         struct tid_ampdu_rx tid_rx[STA_TID_NUM];
 119         struct tid_ampdu_tx tid_tx[STA_TID_NUM];
 120         spinlock_t ampdu_rx;
 121         spinlock_t ampdu_tx;
 122         u8 dialog_token_allocator;
 123 };
 124
 125 struct sta_info {
 126         struct kref kref;
 127         struct list_head list;
 128         struct sta_info *hnext; /* next entry in hash table list */
 129
 130         struct ieee80211_local *local;
 131
 132         u8 addr[ETH_ALEN];
 133         u16 aid; /* STA's unique AID (1..2007), 0 = not yet assigned */
 134         u32 flags; /* WLAN_STA_ */
 135
 136         struct sk_buff_head ps_tx_buf; /* buffer of TX frames for station in
 137                                         * power saving state */
 138         struct sk_buff_head tx_filtered; /* buffer of TX frames that were
 139                                           * already given to low-level driver,
 140                                           * but were filtered */
 141         int clear_dst_mask;
 142
 143         unsigned long rx_packets, tx_packets; /* number of RX/TX MSDUs */
 144         unsigned long rx_bytes, tx_bytes;
 145         unsigned long tx_retry_failed, tx_retry_count;
 146         unsigned long tx_filtered_count;
 147
 148         unsigned int wep_weak_iv_count; /* number of RX frames with weak IV */
 149
 150         unsigned long last_rx;
 151         /* bitmap of supported rates per band */
 152         u64 supp_rates[IEEE80211_NUM_BANDS];
 153         int txrate_idx;
 154         /* last rates used to send a frame to this STA */
 155         int last_txrate_idx, last_nonerp_txrate_idx;
 156
 157         struct net_device *dev; /* which net device is this station associated
 158                                  * to */
 159
 160         struct ieee80211_key *key;
 161
 162         u32 tx_num_consecutive_failures;
 163         u32 tx_num_mpdu_ok;
 164         u32 tx_num_mpdu_fail;
 165
 166         struct rate_control_ref *rate_ctrl;
 167         void *rate_ctrl_priv;
 168
 169         /* last received seq/frag number from this STA (per RX queue) */
 170         __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
 171         unsigned long num_duplicates; /* number of duplicate frames received
 172                                        * from this STA */
 173         unsigned long tx_fragments; /* number of transmitted MPDUs */
 174         unsigned long rx_fragments; /* number of received MPDUs */
 175         unsigned long rx_dropped; /* number of dropped MPDUs from this STA */
 176
 177         int last_rssi; /* RSSI of last received frame from this STA */
 178         int last_signal; /* signal of last received frame from this STA */
 179         int last_noise; /* noise of last received frame from this STA */
 180         int last_ack_rssi[3]; /* RSSI of last received ACKs from this STA */
 181         unsigned long last_ack;
 182         int channel_use;
 183         int channel_use_raw;
 184
 185 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 186         unsigned int wme_rx_queue[NUM_RX_DATA_QUEUES];
 187         unsigned int wme_tx_queue[NUM_RX_DATA_QUEUES];
 188 #endif /* CONFIG_MAC80211_DEBUG_COUNTERS */
 189
 190         u16 listen_interval;
 191
 192         struct ieee80211_ht_info ht_info; /* 802.11n HT capabilities
 193                                              of this STA */
 194         struct sta_ampdu_mlme ampdu_mlme;
 195         u8 timer_to_tid[STA_TID_NUM];   /* convert timer id to tid */
 196         u8 tid_to_tx_q[STA_TID_NUM];    /* map tid to tx queue */
 197
 198 #ifdef CONFIG_MAC80211_DEBUGFS
 199         struct sta_info_debugfsdentries {
 200                 struct dentry *dir;
 201                 struct dentry *flags;
 202                 struct dentry *num_ps_buf_frames;
 203                 struct dentry *last_ack_rssi;
 204                 struct dentry *last_ack_ms;
 205                 struct dentry *inactive_ms;
 206                 struct dentry *last_seq_ctrl;
 207 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 208                 struct dentry *wme_rx_queue;
 209                 struct dentry *wme_tx_queue;
 210 #endif
 211                 struct dentry *agg_status;
 212         } debugfs;
 213 #endif
 214 };
 215
 216
 217 /* Maximum number of concurrently registered stations */
 218 #define MAX_STA_COUNT 2007
 219
 220 #define STA_HASH_SIZE 256
 221 #define STA_HASH(sta) (sta[5])
 222
 223
 224 /* Maximum number of frames to buffer per power saving station */
 225 #define STA_MAX_TX_BUFFER 128
 226
 227 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 228  * smaller than this value, the minimum value here is used instead. */
 229 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 230
 231 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 232  */
 233 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 234
 235 static inline void __sta_info_get(struct sta_info *sta)
 236 {
 237         kref_get(&sta->kref);
 238 }
 239
 240 struct sta_info * sta_info_get(struct ieee80211_local *local, u8 *addr);
 241 void sta_info_put(struct sta_info *sta);
 242 struct sta_info * sta_info_add(struct ieee80211_local *local,
 243                                struct net_device *dev, u8 *addr, gfp_t gfp);
 244 void sta_info_remove(struct sta_info *sta);
 245 void sta_info_free(struct sta_info *sta);
 246 void sta_info_init(struct ieee80211_local *local);
 247 int sta_info_start(struct ieee80211_local *local);
 248 void sta_info_stop(struct ieee80211_local *local);
 249 void sta_info_remove_aid_ptr(struct sta_info *sta);
 250 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev);
 251
 252 #endif /* STA_INFO_H */