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 "key.h"
  16
  17 /**
  18  * enum ieee80211_sta_info_flags - Stations flags
  19  *
  20  * These flags are used with &struct sta_info's @flags member.
  21  *
  22  * @WLAN_STA_AUTH: Station is authenticated.
  23  * @WLAN_STA_ASSOC: Station is associated.
  24  * @WLAN_STA_PS: Station is in power-save mode
  25  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
  26  *      This bit is always checked so needs to be enabled for all stations
  27  *      when virtual port control is not in use.
  28  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
  29  *      frames.
  30  * @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
  31  * @WLAN_STA_WME: Station is a QoS-STA.
  32  * @WLAN_STA_WDS: Station is one of our WDS peers.
  33  * @WLAN_STA_PSPOLL: Station has just PS-polled us.
  34  * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
  35  *      IEEE80211_TXCTL_CLEAR_PS_FILT control flag) when the next
  36  *      frame to this station is transmitted.
  37  */
  38 enum ieee80211_sta_info_flags {
  39         WLAN_STA_AUTH           = 1<<0,
  40         WLAN_STA_ASSOC          = 1<<1,
  41         WLAN_STA_PS             = 1<<2,
  42         WLAN_STA_AUTHORIZED     = 1<<3,
  43         WLAN_STA_SHORT_PREAMBLE = 1<<4,
  44         WLAN_STA_ASSOC_AP       = 1<<5,
  45         WLAN_STA_WME            = 1<<6,
  46         WLAN_STA_WDS            = 1<<7,
  47         WLAN_STA_PSPOLL         = 1<<8,
  48         WLAN_STA_CLEAR_PS_FILT  = 1<<9,
  49 };
  50
  51 #define STA_TID_NUM 16
  52 #define ADDBA_RESP_INTERVAL HZ
  53 #define HT_AGG_MAX_RETRIES              (0x3)
  54
  55 #define HT_AGG_STATE_INITIATOR_SHIFT    (4)
  56
  57 #define HT_ADDBA_REQUESTED_MSK          BIT(0)
  58 #define HT_ADDBA_DRV_READY_MSK          BIT(1)
  59 #define HT_ADDBA_RECEIVED_MSK           BIT(2)
  60 #define HT_AGG_STATE_REQ_STOP_BA_MSK    BIT(3)
  61 #define HT_AGG_STATE_INITIATOR_MSK      BIT(HT_AGG_STATE_INITIATOR_SHIFT)
  62 #define HT_AGG_STATE_IDLE               (0x0)
  63 #define HT_AGG_STATE_OPERATIONAL        (HT_ADDBA_REQUESTED_MSK |       \
  64                                          HT_ADDBA_DRV_READY_MSK |       \
  65                                          HT_ADDBA_RECEIVED_MSK)
  66 #define HT_AGG_STATE_DEBUGFS_CTL        BIT(7)
  67
  68 /**
  69  * struct tid_ampdu_tx - TID aggregation information (Tx).
  70  *
  71  * @addba_resp_timer: timer for peer's response to addba request
  72  * @ssn: Starting Sequence Number expected to be aggregated.
  73  * @dialog_token: dialog token for aggregation session
  74  */
  75 struct tid_ampdu_tx {
  76         struct timer_list addba_resp_timer;
  77         u16 ssn;
  78         u8 dialog_token;
  79 };
  80
  81 /**
  82  * struct tid_ampdu_rx - TID aggregation information (Rx).
  83  *
  84  * @reorder_buf: buffer to reorder incoming aggregated MPDUs
  85  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
  86  * @head_seq_num: head sequence number in reordering buffer.
  87  * @stored_mpdu_num: number of MPDUs in reordering buffer
  88  * @ssn: Starting Sequence Number expected to be aggregated.
  89  * @buf_size: buffer size for incoming A-MPDUs
  90  * @timeout: reset timer value.
  91  * @dialog_token: dialog token for aggregation session
  92  */
  93 struct tid_ampdu_rx {
  94         struct sk_buff **reorder_buf;
  95         struct timer_list session_timer;
  96         u16 head_seq_num;
  97         u16 stored_mpdu_num;
  98         u16 ssn;
  99         u16 buf_size;
 100         u16 timeout;
 101         u8 dialog_token;
 102 };
 103
 104 /**
 105  * enum plink_state - state of a mesh peer link finite state machine
 106  *
 107  * @PLINK_LISTEN: initial state, considered the implicit state of non existant
 108  *      mesh peer links
 109  * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
 110  * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
 111  * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
 112  *      peer
 113  * @PLINK_ESTAB: mesh peer link is established
 114  * @PLINK_HOLDING: mesh peer link is being closed or cancelled
 115  * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
 116  */
 117 enum plink_state {
 118         PLINK_LISTEN,
 119         PLINK_OPN_SNT,
 120         PLINK_OPN_RCVD,
 121         PLINK_CNF_RCVD,
 122         PLINK_ESTAB,
 123         PLINK_HOLDING,
 124         PLINK_BLOCKED
 125 };
 126
 127 /**
 128  * struct sta_ampdu_mlme - STA aggregation information.
 129  *
 130  * @tid_state_rx: TID's state in Rx session state machine.
 131  * @tid_rx: aggregation info for Rx per TID
 132  * @ampdu_rx: for locking sections in aggregation Rx flow
 133  * @tid_state_tx: TID's state in Tx session state machine.
 134  * @tid_tx: aggregation info for Tx per TID
 135  * @addba_req_num: number of times addBA request has been sent.
 136  * @ampdu_tx: for locking sectionsi in aggregation Tx flow
 137  * @dialog_token_allocator: dialog token enumerator for each new session;
 138  */
 139 struct sta_ampdu_mlme {
 140         /* rx */
 141         u8 tid_state_rx[STA_TID_NUM];
 142         struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
 143         spinlock_t ampdu_rx;
 144         /* tx */
 145         u8 tid_state_tx[STA_TID_NUM];
 146         struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
 147         u8 addba_req_num[STA_TID_NUM];
 148         spinlock_t ampdu_tx;
 149         u8 dialog_token_allocator;
 150 };
 151
 152
 153 /* see __sta_info_unlink */
 154 #define STA_INFO_PIN_STAT_NORMAL        0
 155 #define STA_INFO_PIN_STAT_PINNED        1
 156 #define STA_INFO_PIN_STAT_DESTROY       2
 157
 158 /**
 159  * struct sta_info - STA information
 160  *
 161  * This structure collects information about a station that
 162  * mac80211 is communicating with.
 163  *
 164  * @list: global linked list entry
 165  * @hnext: hash table linked list pointer
 166  * @local: pointer to the global information
 167  * @addr: MAC address of this STA
 168  * @aid: STA's unique AID (1..2007, 0 = not assigned yet),
 169  *      only used in AP (and IBSS?) mode
 170  * @flags: STA flags, see &enum ieee80211_sta_info_flags
 171  * @ps_tx_buf: buffer of frames to transmit to this station
 172  *      when it leaves power saving state
 173  * @tx_filtered: buffer of frames we already tried to transmit
 174  *      but were filtered by hardware due to STA having entered
 175  *      power saving state
 176  * @rx_packets: Number of MSDUs received from this STA
 177  * @rx_bytes: Number of bytes received from this STA
 178  * @supp_rates: Bitmap of supported rates (per band)
 179  * @ht_info: HT capabilities of this STA
 180  */
 181 struct sta_info {
 182         /* General information, mostly static */
 183         struct list_head list;
 184         struct sta_info *hnext;
 185         struct ieee80211_local *local;
 186         struct ieee80211_sub_if_data *sdata;
 187         struct ieee80211_key *key;
 188         struct rate_control_ref *rate_ctrl;
 189         void *rate_ctrl_priv;
 190         struct ieee80211_ht_info ht_info;
 191         u64 supp_rates[IEEE80211_NUM_BANDS];
 192         u8 addr[ETH_ALEN];
 193         u16 aid;
 194         u16 listen_interval;
 195
 196         /*
 197          * for use by the internal lifetime management,
 198          * see __sta_info_unlink
 199          */
 200         u8 pin_status;
 201
 202         /* frequently updated information, needs locking? */
 203         u32 flags;
 204
 205         /*
 206          * STA powersave frame queues, no more than the internal
 207          * locking required.
 208          */
 209         struct sk_buff_head ps_tx_buf;
 210         struct sk_buff_head tx_filtered;
 211
 212         /* Updated from RX path only, no locking requirements */
 213         unsigned long rx_packets, rx_bytes;
 214         unsigned long wep_weak_iv_count;
 215         unsigned long last_rx;
 216         unsigned long num_duplicates; /* number of duplicate frames received
 217                                        * from this STA */
 218         unsigned long rx_fragments; /* number of received MPDUs */
 219         unsigned long rx_dropped; /* number of dropped MPDUs from this STA */
 220         int last_rssi; /* RSSI of last received frame from this STA */
 221         int last_signal; /* signal of last received frame from this STA */
 222         int last_noise; /* noise of last received frame from this STA */
 223         /* last received seq/frag number from this STA (per RX queue) */
 224         __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
 225 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 226         unsigned int wme_rx_queue[NUM_RX_DATA_QUEUES];
 227 #endif
 228
 229         /* Updated from TX status path only, no locking requirements */
 230         unsigned long tx_filtered_count;
 231         unsigned long tx_retry_failed, tx_retry_count;
 232         /* TODO: update in generic code not rate control? */
 233         u32 tx_num_consecutive_failures;
 234         u32 tx_num_mpdu_ok;
 235         u32 tx_num_mpdu_fail;
 236         /* moving percentage of failed MSDUs */
 237         unsigned int fail_avg;
 238
 239         /* Updated from TX path only, no locking requirements */
 240         unsigned long tx_packets; /* number of RX/TX MSDUs */
 241         unsigned long tx_bytes;
 242         unsigned long tx_fragments; /* number of transmitted MPDUs */
 243         int txrate_idx;
 244         int last_txrate_idx;
 245 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 246         unsigned int wme_tx_queue[NUM_RX_DATA_QUEUES];
 247 #endif
 248
 249         /* Debug counters, no locking doesn't matter */
 250         int channel_use;
 251         int channel_use_raw;
 252
 253         /*
 254          * Aggregation information, comes with own locking.
 255          */
 256         struct sta_ampdu_mlme ampdu_mlme;
 257         u8 timer_to_tid[STA_TID_NUM];   /* identity mapping to ID timers */
 258         u8 tid_to_tx_q[STA_TID_NUM];    /* map tid to tx queue */
 259
 260 #ifdef CONFIG_MAC80211_MESH
 261         /*
 262          * Mesh peer link attributes
 263          * TODO: move to a sub-structure that is referenced with pointer?
 264          */
 265         __le16 llid;            /* Local link ID */
 266         __le16 plid;            /* Peer link ID */
 267         __le16 reason;          /* Cancel reason on PLINK_HOLDING state */
 268         u8 plink_retries;       /* Retries in establishment */
 269         bool ignore_plink_timer;
 270         enum plink_state plink_state;
 271         u32 plink_timeout;
 272         struct timer_list plink_timer;
 273         spinlock_t plink_lock;  /* For peer_state reads / updates and other
 274                                    updates in the structure. Ensures robust
 275                                    transitions for the peerlink FSM */
 276 #endif
 277
 278 #ifdef CONFIG_MAC80211_DEBUGFS
 279         struct sta_info_debugfsdentries {
 280                 struct dentry *dir;
 281                 struct dentry *flags;
 282                 struct dentry *num_ps_buf_frames;
 283                 struct dentry *inactive_ms;
 284                 struct dentry *last_seq_ctrl;
 285 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 286                 struct dentry *wme_rx_queue;
 287                 struct dentry *wme_tx_queue;
 288 #endif
 289                 struct dentry *agg_status;
 290         } debugfs;
 291 #endif
 292 };
 293
 294 static inline enum plink_state sta_plink_state(struct sta_info *sta)
 295 {
 296 #ifdef CONFIG_MAC80211_MESH
 297         return sta->plink_state;
 298 #endif
 299         return PLINK_LISTEN;
 300 }
 301
 302
 303 /* Maximum number of concurrently registered stations */
 304 #define MAX_STA_COUNT 2007
 305
 306 #define STA_HASH_SIZE 256
 307 #define STA_HASH(sta) (sta[5])
 308
 309
 310 /* Maximum number of frames to buffer per power saving station */
 311 #define STA_MAX_TX_BUFFER 128
 312
 313 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 314  * smaller than this value, the minimum value here is used instead. */
 315 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 316
 317 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 318  */
 319 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 320
 321 /*
 322  * Get a STA info, must have be under RCU read lock.
 323  */
 324 struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr);
 325 /*
 326  * Get STA info by index, BROKEN!
 327  */
 328 struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
 329                                       struct net_device *dev);
 330 /*
 331  * Create a new STA info, caller owns returned structure
 332  * until sta_info_insert().
 333  */
 334 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 335                                 u8 *addr, gfp_t gfp);
 336 /*
 337  * Insert STA info into hash table/list, returns zero or a
 338  * -EEXIST if (if the same MAC address is already present).
 339  *
 340  * Calling this without RCU protection makes the caller
 341  * relinquish its reference to @sta.
 342  */
 343 int sta_info_insert(struct sta_info *sta);
 344 /*
 345  * Unlink a STA info from the hash table/list.
 346  * This can NULL the STA pointer if somebody else
 347  * has already unlinked it.
 348  */
 349 void sta_info_unlink(struct sta_info **sta);
 350 void __sta_info_unlink(struct sta_info **sta);
 351
 352 void sta_info_destroy(struct sta_info *sta);
 353 void sta_info_set_tim_bit(struct sta_info *sta);
 354 void sta_info_clear_tim_bit(struct sta_info *sta);
 355
 356 void sta_info_init(struct ieee80211_local *local);
 357 int sta_info_start(struct ieee80211_local *local);
 358 void sta_info_stop(struct ieee80211_local *local);
 359 int sta_info_flush(struct ieee80211_local *local,
 360                     struct ieee80211_sub_if_data *sdata);
 361 void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata);
 362
 363 #endif /* STA_INFO_H */