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_TX_CTL_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  * @tid_state_tx: TID's state in Tx session state machine.
 133  * @tid_tx: aggregation info for Tx per TID
 134  * @addba_req_num: number of times addBA request has been sent.
 135  * @dialog_token_allocator: dialog token enumerator for each new session;
 136  */
 137 struct sta_ampdu_mlme {
 138         /* rx */
 139         u8 tid_state_rx[STA_TID_NUM];
 140         struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
 141         /* tx */
 142         u8 tid_state_tx[STA_TID_NUM];
 143         struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
 144         u8 addba_req_num[STA_TID_NUM];
 145         u8 dialog_token_allocator;
 146 };
 147
 148
 149 /* see __sta_info_unlink */
 150 #define STA_INFO_PIN_STAT_NORMAL        0
 151 #define STA_INFO_PIN_STAT_PINNED        1
 152 #define STA_INFO_PIN_STAT_DESTROY       2
 153
 154 /**
 155  * struct sta_info - STA information
 156  *
 157  * This structure collects information about a station that
 158  * mac80211 is communicating with.
 159  *
 160  * @list: global linked list entry
 161  * @hnext: hash table linked list pointer
 162  * @local: pointer to the global information
 163  * @sdata: TBD
 164  * @key: TBD
 165  * @rate_ctrl: TBD
 166  * @rate_ctrl_priv: TBD
 167  * @lock: used for locking all fields that require locking, see comments
 168  *      in the header file.
 169  * @flaglock: spinlock for flags accesses
 170  * @addr: MAC address of this STA
 171  * @aid: STA's unique AID (1..2007, 0 = not assigned yet),
 172  *      only used in AP (and IBSS?) mode
 173  * @listen_interval: TBD
 174  * @pin_status: TBD
 175  * @flags: STA flags, see &enum ieee80211_sta_info_flags
 176  * @ps_tx_buf: buffer of frames to transmit to this station
 177  *      when it leaves power saving state
 178  * @tx_filtered: buffer of frames we already tried to transmit
 179  *      but were filtered by hardware due to STA having entered
 180  *      power saving state
 181  * @rx_packets: Number of MSDUs received from this STA
 182  * @rx_bytes: Number of bytes received from this STA
 183  * @wep_weak_iv_count: TBD
 184  * @last_rx: TBD
 185  * @num_duplicates: number of duplicate frames received from this STA
 186  * @rx_fragments: number of received MPDUs
 187  * @rx_dropped: number of dropped MPDUs from this STA
 188  * @last_signal: signal of last received frame from this STA
 189  * @last_qual: qual of last received frame from this STA
 190  * @last_noise: noise of last received frame from this STA
 191  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
 192  * @tx_filtered_count: TBD
 193  * @tx_retry_failed: TBD
 194  * @tx_retry_count: TBD
 195  * @fail_avg: moving percentage of failed MSDUs
 196  * @tx_packets: number of RX/TX MSDUs
 197  * @tx_bytes: TBD
 198  * @tx_fragments: number of transmitted MPDUs
 199  * @last_txrate_idx: Index of the last used transmit rate
 200  * @tid_seq: TBD
 201  * @ampdu_mlme: TBD
 202  * @timer_to_tid: identity mapping to ID timers
 203  * @tid_to_tx_q: map tid to tx queue
 204  * @llid: Local link ID
 205  * @plid: Peer link ID
 206  * @reason: Cancel reason on PLINK_HOLDING state
 207  * @plink_retries: Retries in establishment
 208  * @ignore_plink_timer: TBD
 209  * @plink_state plink_state: TBD
 210  * @plink_timeout: TBD
 211  * @plink_timer: TBD
 212  * @debugfs: debug filesystem info
 213  * @sta: station information we share with the driver
 214  */
 215 struct sta_info {
 216         /* General information, mostly static */
 217         struct list_head list;
 218         struct sta_info *hnext;
 219         struct ieee80211_local *local;
 220         struct ieee80211_sub_if_data *sdata;
 221         struct ieee80211_key *key;
 222         struct rate_control_ref *rate_ctrl;
 223         void *rate_ctrl_priv;
 224         spinlock_t lock;
 225         spinlock_t flaglock;
 226
 227         u16 listen_interval;
 228
 229         /*
 230          * for use by the internal lifetime management,
 231          * see __sta_info_unlink
 232          */
 233         u8 pin_status;
 234
 235         /*
 236          * frequently updated, locked with own spinlock (flaglock),
 237          * use the accessors defined below
 238          */
 239         u32 flags;
 240
 241         /*
 242          * STA powersave frame queues, no more than the internal
 243          * locking required.
 244          */
 245         struct sk_buff_head ps_tx_buf;
 246         struct sk_buff_head tx_filtered;
 247
 248         /* Updated from RX path only, no locking requirements */
 249         unsigned long rx_packets, rx_bytes;
 250         unsigned long wep_weak_iv_count;
 251         unsigned long last_rx;
 252         unsigned long num_duplicates;
 253         unsigned long rx_fragments;
 254         unsigned long rx_dropped;
 255         int last_signal;
 256         int last_qual;
 257         int last_noise;
 258         __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
 259
 260         /* Updated from TX status path only, no locking requirements */
 261         unsigned long tx_filtered_count;
 262         unsigned long tx_retry_failed, tx_retry_count;
 263         /* moving percentage of failed MSDUs */
 264         unsigned int fail_avg;
 265
 266         /* Updated from TX path only, no locking requirements */
 267         unsigned long tx_packets;
 268         unsigned long tx_bytes;
 269         unsigned long tx_fragments;
 270         unsigned int last_txrate_idx;
 271         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 272
 273         /*
 274          * Aggregation information, locked with lock.
 275          */
 276         struct sta_ampdu_mlme ampdu_mlme;
 277         u8 timer_to_tid[STA_TID_NUM];
 278         u8 tid_to_tx_q[STA_TID_NUM];
 279
 280 #ifdef CONFIG_MAC80211_MESH
 281         /*
 282          * Mesh peer link attributes
 283          * TODO: move to a sub-structure that is referenced with pointer?
 284          */
 285         __le16 llid;
 286         __le16 plid;
 287         __le16 reason;
 288         u8 plink_retries;
 289         bool ignore_plink_timer;
 290         enum plink_state plink_state;
 291         u32 plink_timeout;
 292         struct timer_list plink_timer;
 293 #endif
 294
 295 #ifdef CONFIG_MAC80211_DEBUGFS
 296         struct sta_info_debugfsdentries {
 297                 struct dentry *dir;
 298                 struct dentry *flags;
 299                 struct dentry *num_ps_buf_frames;
 300                 struct dentry *inactive_ms;
 301                 struct dentry *last_seq_ctrl;
 302                 struct dentry *agg_status;
 303         } debugfs;
 304 #endif
 305
 306         /* keep last! */
 307         struct ieee80211_sta sta;
 308 };
 309
 310 static inline enum plink_state sta_plink_state(struct sta_info *sta)
 311 {
 312 #ifdef CONFIG_MAC80211_MESH
 313         return sta->plink_state;
 314 #endif
 315         return PLINK_LISTEN;
 316 }
 317
 318 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
 319 {
 320         unsigned long irqfl;
 321
 322         spin_lock_irqsave(&sta->flaglock, irqfl);
 323         sta->flags |= flags;
 324         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 325 }
 326
 327 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
 328 {
 329         unsigned long irqfl;
 330
 331         spin_lock_irqsave(&sta->flaglock, irqfl);
 332         sta->flags &= ~flags;
 333         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 334 }
 335
 336 static inline void set_and_clear_sta_flags(struct sta_info *sta,
 337                                            const u32 set, const u32 clear)
 338 {
 339         unsigned long irqfl;
 340
 341         spin_lock_irqsave(&sta->flaglock, irqfl);
 342         sta->flags |= set;
 343         sta->flags &= ~clear;
 344         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 345 }
 346
 347 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
 348 {
 349         u32 ret;
 350         unsigned long irqfl;
 351
 352         spin_lock_irqsave(&sta->flaglock, irqfl);
 353         ret = sta->flags & flags;
 354         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 355
 356         return ret;
 357 }
 358
 359 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
 360                                            const u32 flags)
 361 {
 362         u32 ret;
 363         unsigned long irqfl;
 364
 365         spin_lock_irqsave(&sta->flaglock, irqfl);
 366         ret = sta->flags & flags;
 367         sta->flags &= ~flags;
 368         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 369
 370         return ret;
 371 }
 372
 373 static inline u32 get_sta_flags(struct sta_info *sta)
 374 {
 375         u32 ret;
 376         unsigned long irqfl;
 377
 378         spin_lock_irqsave(&sta->flaglock, irqfl);
 379         ret = sta->flags;
 380         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 381
 382         return ret;
 383 }
 384
 385
 386 /* Maximum number of concurrently registered stations */
 387 #define MAX_STA_COUNT 2007
 388
 389 #define STA_HASH_SIZE 256
 390 #define STA_HASH(sta) (sta[5])
 391
 392
 393 /* Maximum number of frames to buffer per power saving station */
 394 #define STA_MAX_TX_BUFFER 128
 395
 396 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 397  * smaller than this value, the minimum value here is used instead. */
 398 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 399
 400 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 401  */
 402 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 403
 404 /*
 405  * Get a STA info, must have be under RCU read lock.
 406  */
 407 struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr);
 408 /*
 409  * Get STA info by index, BROKEN!
 410  */
 411 struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
 412                                       struct net_device *dev);
 413 /*
 414  * Create a new STA info, caller owns returned structure
 415  * until sta_info_insert().
 416  */
 417 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 418                                 u8 *addr, gfp_t gfp);
 419 /*
 420  * Insert STA info into hash table/list, returns zero or a
 421  * -EEXIST if (if the same MAC address is already present).
 422  *
 423  * Calling this without RCU protection makes the caller
 424  * relinquish its reference to @sta.
 425  */
 426 int sta_info_insert(struct sta_info *sta);
 427 /*
 428  * Unlink a STA info from the hash table/list.
 429  * This can NULL the STA pointer if somebody else
 430  * has already unlinked it.
 431  */
 432 void sta_info_unlink(struct sta_info **sta);
 433
 434 void sta_info_destroy(struct sta_info *sta);
 435 void sta_info_set_tim_bit(struct sta_info *sta);
 436 void sta_info_clear_tim_bit(struct sta_info *sta);
 437
 438 void sta_info_init(struct ieee80211_local *local);
 439 int sta_info_start(struct ieee80211_local *local);
 440 void sta_info_stop(struct ieee80211_local *local);
 441 int sta_info_flush(struct ieee80211_local *local,
 442                     struct ieee80211_sub_if_data *sdata);
 443 void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata);
 444 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 445                           unsigned long exp_time);
 446
 447 #endif /* STA_INFO_H */