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/workqueue.h>
  16 #include <linux/average.h>
  17 #include "key.h"
  18
  19 /**
  20  * enum ieee80211_sta_info_flags - Stations flags
  21  *
  22  * These flags are used with &struct sta_info's @flags member.
  23  *
  24  * @WLAN_STA_AUTH: Station is authenticated.
  25  * @WLAN_STA_ASSOC: Station is associated.
  26  * @WLAN_STA_PS_STA: Station is in power-save mode
  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_CLEAR_PS_FILT: Clear PS filter in hardware (using the
  36  *      IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
  37  *      frame to this station is transmitted.
  38  * @WLAN_STA_MFP: Management frame protection is used with this STA.
  39  * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
  40  *      during suspend/resume and station removal.
  41  * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
  42  *      power-save mode logically to flush frames that might still
  43  *      be in the queues
  44  * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
  45  *      station in power-save mode, reply when the driver unblocks.
  46  */
  47 enum ieee80211_sta_info_flags {
  48         WLAN_STA_AUTH           = 1<<0,
  49         WLAN_STA_ASSOC          = 1<<1,
  50         WLAN_STA_PS_STA         = 1<<2,
  51         WLAN_STA_AUTHORIZED     = 1<<3,
  52         WLAN_STA_SHORT_PREAMBLE = 1<<4,
  53         WLAN_STA_ASSOC_AP       = 1<<5,
  54         WLAN_STA_WME            = 1<<6,
  55         WLAN_STA_WDS            = 1<<7,
  56         WLAN_STA_CLEAR_PS_FILT  = 1<<9,
  57         WLAN_STA_MFP            = 1<<10,
  58         WLAN_STA_BLOCK_BA       = 1<<11,
  59         WLAN_STA_PS_DRIVER      = 1<<12,
  60         WLAN_STA_PSPOLL         = 1<<13,
  61 };
  62
  63 #define STA_TID_NUM 16
  64 #define ADDBA_RESP_INTERVAL HZ
  65 #define HT_AGG_MAX_RETRIES              0x3
  66
  67 #define HT_AGG_STATE_DRV_READY          0
  68 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
  69 #define HT_AGG_STATE_OPERATIONAL        2
  70 #define HT_AGG_STATE_STOPPING           3
  71 #define HT_AGG_STATE_WANT_START         4
  72 #define HT_AGG_STATE_WANT_STOP          5
  73
  74 /**
  75  * struct tid_ampdu_tx - TID aggregation information (Tx).
  76  *
  77  * @rcu_head: rcu head for freeing structure
  78  * @addba_resp_timer: timer for peer's response to addba request
  79  * @pending: pending frames queue -- use sta's spinlock to protect
  80  * @dialog_token: dialog token for aggregation session
  81  * @timeout: session timeout value to be filled in ADDBA requests
  82  * @state: session state (see above)
  83  * @stop_initiator: initiator of a session stop
  84  * @tx_stop: TX DelBA frame when stopping
  85  * @buf_size: reorder buffer size at receiver
  86  *
  87  * This structure's lifetime is managed by RCU, assignments to
  88  * the array holding it must hold the aggregation mutex.
  89  *
  90  * The TX path can access it under RCU lock-free if, and
  91  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
  92  * set. Otherwise, the TX path must also acquire the spinlock
  93  * and re-check the state, see comments in the tx code
  94  * touching it.
  95  */
  96 struct tid_ampdu_tx {
  97         struct rcu_head rcu_head;
  98         struct timer_list addba_resp_timer;
  99         struct sk_buff_head pending;
 100         unsigned long state;
 101         u16 timeout;
 102         u8 dialog_token;
 103         u8 stop_initiator;
 104         bool tx_stop;
 105         u8 buf_size;
 106 };
 107
 108 /**
 109  * struct tid_ampdu_rx - TID aggregation information (Rx).
 110  *
 111  * @reorder_buf: buffer to reorder incoming aggregated MPDUs
 112  * @reorder_time: jiffies when skb was added
 113  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 114  * @reorder_timer: releases expired frames from the reorder buffer.
 115  * @head_seq_num: head sequence number in reordering buffer.
 116  * @stored_mpdu_num: number of MPDUs in reordering buffer
 117  * @ssn: Starting Sequence Number expected to be aggregated.
 118  * @buf_size: buffer size for incoming A-MPDUs
 119  * @timeout: reset timer value (in TUs).
 120  * @dialog_token: dialog token for aggregation session
 121  * @rcu_head: RCU head used for freeing this struct
 122  * @reorder_lock: serializes access to reorder buffer, see below.
 123  *
 124  * This structure's lifetime is managed by RCU, assignments to
 125  * the array holding it must hold the aggregation mutex.
 126  *
 127  * The @reorder_lock is used to protect the members of this
 128  * struct, except for @timeout, @buf_size and @dialog_token,
 129  * which are constant across the lifetime of the struct (the
 130  * dialog token being used only for debugging).
 131  */
 132 struct tid_ampdu_rx {
 133         struct rcu_head rcu_head;
 134         spinlock_t reorder_lock;
 135         struct sk_buff **reorder_buf;
 136         unsigned long *reorder_time;
 137         struct timer_list session_timer;
 138         struct timer_list reorder_timer;
 139         u16 head_seq_num;
 140         u16 stored_mpdu_num;
 141         u16 ssn;
 142         u16 buf_size;
 143         u16 timeout;
 144         u8 dialog_token;
 145 };
 146
 147 /**
 148  * struct sta_ampdu_mlme - STA aggregation information.
 149  *
 150  * @tid_rx: aggregation info for Rx per TID -- RCU protected
 151  * @tid_tx: aggregation info for Tx per TID
 152  * @addba_req_num: number of times addBA request has been sent.
 153  * @dialog_token_allocator: dialog token enumerator for each new session;
 154  * @work: work struct for starting/stopping aggregation
 155  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 156  *      RX timer expired until the work for it runs
 157  * @mtx: mutex to protect all TX data (except non-NULL assignments
 158  *      to tid_tx[idx], which are protected by the sta spinlock)
 159  */
 160 struct sta_ampdu_mlme {
 161         struct mutex mtx;
 162         /* rx */
 163         struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
 164         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
 165         /* tx */
 166         struct work_struct work;
 167         struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
 168         u8 addba_req_num[STA_TID_NUM];
 169         u8 dialog_token_allocator;
 170 };
 171
 172
 173 /**
 174  * enum plink_state - state of a mesh peer link finite state machine
 175  *
 176  * @PLINK_LISTEN: initial state, considered the implicit state of non existent
 177  *      mesh peer links
 178  * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
 179  * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
 180  * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
 181  *      peer
 182  * @PLINK_ESTAB: mesh peer link is established
 183  * @PLINK_HOLDING: mesh peer link is being closed or cancelled
 184  * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
 185  */
 186 enum plink_state {
 187         PLINK_LISTEN,
 188         PLINK_OPN_SNT,
 189         PLINK_OPN_RCVD,
 190         PLINK_CNF_RCVD,
 191         PLINK_ESTAB,
 192         PLINK_HOLDING,
 193         PLINK_BLOCKED
 194 };
 195
 196 /**
 197  * struct sta_info - STA information
 198  *
 199  * This structure collects information about a station that
 200  * mac80211 is communicating with.
 201  *
 202  * @list: global linked list entry
 203  * @hnext: hash table linked list pointer
 204  * @local: pointer to the global information
 205  * @sdata: virtual interface this station belongs to
 206  * @ptk: peer key negotiated with this station, if any
 207  * @gtk: group keys negotiated with this station, if any
 208  * @rate_ctrl: rate control algorithm reference
 209  * @rate_ctrl_priv: rate control private per-STA pointer
 210  * @last_tx_rate: rate used for last transmit, to report to userspace as
 211  *      "the" transmit rate
 212  * @last_rx_rate_idx: rx status rate index of the last data packet
 213  * @last_rx_rate_flag: rx status flag of the last data packet
 214  * @lock: used for locking all fields that require locking, see comments
 215  *      in the header file.
 216  * @flaglock: spinlock for flags accesses
 217  * @drv_unblock_wk: used for driver PS unblocking
 218  * @listen_interval: listen interval of this station, when we're acting as AP
 219  * @flags: STA flags, see &enum ieee80211_sta_info_flags
 220  * @ps_tx_buf: buffer of frames to transmit to this station
 221  *      when it leaves power saving state
 222  * @tx_filtered: buffer of frames we already tried to transmit
 223  *      but were filtered by hardware due to STA having entered
 224  *      power saving state
 225  * @rx_packets: Number of MSDUs received from this STA
 226  * @rx_bytes: Number of bytes received from this STA
 227  * @wep_weak_iv_count: number of weak WEP IVs received from this station
 228  * @last_rx: time (in jiffies) when last frame was received from this STA
 229  * @num_duplicates: number of duplicate frames received from this STA
 230  * @rx_fragments: number of received MPDUs
 231  * @rx_dropped: number of dropped MPDUs from this STA
 232  * @last_signal: signal of last received frame from this STA
 233  * @avg_signal: moving average of signal of received frames from this STA
 234  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
 235  * @tx_filtered_count: number of frames the hardware filtered for this STA
 236  * @tx_retry_failed: number of frames that failed retry
 237  * @tx_retry_count: total number of retries for frames to this STA
 238  * @fail_avg: moving percentage of failed MSDUs
 239  * @tx_packets: number of RX/TX MSDUs
 240  * @tx_bytes: number of bytes transmitted to this STA
 241  * @tx_fragments: number of transmitted MPDUs
 242  * @tid_seq: per-TID sequence numbers for sending to this STA
 243  * @ampdu_mlme: A-MPDU state machine state
 244  * @timer_to_tid: identity mapping to ID timers
 245  * @llid: Local link ID
 246  * @plid: Peer link ID
 247  * @reason: Cancel reason on PLINK_HOLDING state
 248  * @plink_retries: Retries in establishment
 249  * @ignore_plink_timer: ignore the peer-link timer (used internally)
 250  * @plink_state: peer link state
 251  * @plink_timeout: timeout of peer link
 252  * @plink_timer: peer link watch timer
 253  * @plink_timer_was_running: used by suspend/resume to restore timers
 254  * @debugfs: debug filesystem info
 255  * @sta: station information we share with the driver
 256  * @dead: set to true when sta is unlinked
 257  * @uploaded: set to true when sta is uploaded to the driver
 258  * @lost_packets: number of consecutive lost packets
 259  */
 260 struct sta_info {
 261         /* General information, mostly static */
 262         struct list_head list;
 263         struct sta_info *hnext;
 264         struct ieee80211_local *local;
 265         struct ieee80211_sub_if_data *sdata;
 266         struct ieee80211_key *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
 267         struct ieee80211_key *ptk;
 268         struct rate_control_ref *rate_ctrl;
 269         void *rate_ctrl_priv;
 270         spinlock_t lock;
 271         spinlock_t flaglock;
 272
 273         struct work_struct drv_unblock_wk;
 274
 275         u16 listen_interval;
 276
 277         bool dead;
 278
 279         bool uploaded;
 280
 281         /*
 282          * frequently updated, locked with own spinlock (flaglock),
 283          * use the accessors defined below
 284          */
 285         u32 flags;
 286
 287         /*
 288          * STA powersave frame queues, no more than the internal
 289          * locking required.
 290          */
 291         struct sk_buff_head ps_tx_buf;
 292         struct sk_buff_head tx_filtered;
 293
 294         /* Updated from RX path only, no locking requirements */
 295         unsigned long rx_packets, rx_bytes;
 296         unsigned long wep_weak_iv_count;
 297         unsigned long last_rx;
 298         unsigned long num_duplicates;
 299         unsigned long rx_fragments;
 300         unsigned long rx_dropped;
 301         int last_signal;
 302         struct ewma avg_signal;
 303         __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
 304
 305         /* Updated from TX status path only, no locking requirements */
 306         unsigned long tx_filtered_count;
 307         unsigned long tx_retry_failed, tx_retry_count;
 308         /* moving percentage of failed MSDUs */
 309         unsigned int fail_avg;
 310
 311         /* Updated from TX path only, no locking requirements */
 312         unsigned long tx_packets;
 313         unsigned long tx_bytes;
 314         unsigned long tx_fragments;
 315         struct ieee80211_tx_rate last_tx_rate;
 316         int last_rx_rate_idx;
 317         int last_rx_rate_flag;
 318         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 319
 320         /*
 321          * Aggregation information, locked with lock.
 322          */
 323         struct sta_ampdu_mlme ampdu_mlme;
 324         u8 timer_to_tid[STA_TID_NUM];
 325
 326 #ifdef CONFIG_MAC80211_MESH
 327         /*
 328          * Mesh peer link attributes
 329          * TODO: move to a sub-structure that is referenced with pointer?
 330          */
 331         __le16 llid;
 332         __le16 plid;
 333         __le16 reason;
 334         u8 plink_retries;
 335         bool ignore_plink_timer;
 336         bool plink_timer_was_running;
 337         enum plink_state plink_state;
 338         u32 plink_timeout;
 339         struct timer_list plink_timer;
 340 #endif
 341
 342 #ifdef CONFIG_MAC80211_DEBUGFS
 343         struct sta_info_debugfsdentries {
 344                 struct dentry *dir;
 345                 bool add_has_run;
 346         } debugfs;
 347 #endif
 348
 349         unsigned int lost_packets;
 350
 351         /* keep last! */
 352         struct ieee80211_sta sta;
 353 };
 354
 355 static inline enum plink_state sta_plink_state(struct sta_info *sta)
 356 {
 357 #ifdef CONFIG_MAC80211_MESH
 358         return sta->plink_state;
 359 #endif
 360         return PLINK_LISTEN;
 361 }
 362
 363 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
 364 {
 365         unsigned long irqfl;
 366
 367         spin_lock_irqsave(&sta->flaglock, irqfl);
 368         sta->flags |= flags;
 369         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 370 }
 371
 372 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
 373 {
 374         unsigned long irqfl;
 375
 376         spin_lock_irqsave(&sta->flaglock, irqfl);
 377         sta->flags &= ~flags;
 378         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 379 }
 380
 381 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
 382 {
 383         u32 ret;
 384         unsigned long irqfl;
 385
 386         spin_lock_irqsave(&sta->flaglock, irqfl);
 387         ret = sta->flags & flags;
 388         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 389
 390         return ret;
 391 }
 392
 393 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
 394                                            const u32 flags)
 395 {
 396         u32 ret;
 397         unsigned long irqfl;
 398
 399         spin_lock_irqsave(&sta->flaglock, irqfl);
 400         ret = sta->flags & flags;
 401         sta->flags &= ~flags;
 402         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 403
 404         return ret;
 405 }
 406
 407 static inline u32 get_sta_flags(struct sta_info *sta)
 408 {
 409         u32 ret;
 410         unsigned long irqfl;
 411
 412         spin_lock_irqsave(&sta->flaglock, irqfl);
 413         ret = sta->flags;
 414         spin_unlock_irqrestore(&sta->flaglock, irqfl);
 415
 416         return ret;
 417 }
 418
 419
 420
 421 #define STA_HASH_SIZE 256
 422 #define STA_HASH(sta) (sta[5])
 423
 424
 425 /* Maximum number of frames to buffer per power saving station */
 426 #define STA_MAX_TX_BUFFER 128
 427
 428 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 429  * smaller than this value, the minimum value here is used instead. */
 430 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 431
 432 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 433  */
 434 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 435
 436 /*
 437  * Get a STA info, must be under RCU read lock.
 438  */
 439 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 440                               const u8 *addr);
 441
 442 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 443                                   const u8 *addr);
 444
 445 static inline
 446 void for_each_sta_info_type_check(struct ieee80211_local *local,
 447                                   const u8 *addr,
 448                                   struct sta_info *sta,
 449                                   struct sta_info *nxt)
 450 {
 451 }
 452
 453 #define for_each_sta_info(local, _addr, _sta, nxt)                      \
 454         for (   /* initialise loop */                                   \
 455                 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
 456                 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;       \
 457                 /* typecheck */                                         \
 458                 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
 459                 /* continue condition */                                \
 460                 _sta;                                                   \
 461                 /* advance loop */                                      \
 462                 _sta = nxt,                                             \
 463                 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL        \
 464              )                                                          \
 465         /* compare address and run code only if it matches */           \
 466         if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
 467
 468 /*
 469  * Get STA info by index, BROKEN!
 470  */
 471 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 472                                      int idx);
 473 /*
 474  * Create a new STA info, caller owns returned structure
 475  * until sta_info_insert().
 476  */
 477 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 478                                 u8 *addr, gfp_t gfp);
 479 /*
 480  * Insert STA info into hash table/list, returns zero or a
 481  * -EEXIST if (if the same MAC address is already present).
 482  *
 483  * Calling the non-rcu version makes the caller relinquish,
 484  * the _rcu version calls read_lock_rcu() and must be called
 485  * without it held.
 486  */
 487 int sta_info_insert(struct sta_info *sta);
 488 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
 489 int sta_info_insert_atomic(struct sta_info *sta);
 490
 491 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
 492                           const u8 *addr);
 493 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 494                               const u8 *addr);
 495
 496 void sta_info_set_tim_bit(struct sta_info *sta);
 497 void sta_info_clear_tim_bit(struct sta_info *sta);
 498
 499 void sta_info_init(struct ieee80211_local *local);
 500 int sta_info_start(struct ieee80211_local *local);
 501 void sta_info_stop(struct ieee80211_local *local);
 502 int sta_info_flush(struct ieee80211_local *local,
 503                    struct ieee80211_sub_if_data *sdata);
 504 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 505                           unsigned long exp_time);
 506
 507 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
 508 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
 509
 510 #endif /* STA_INFO_H */