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TOMOYO Linux Cross Reference
Linux/net/mac80211/sta_info.h

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  1 /*
  2  * Copyright 2002-2005, Devicescape Software, Inc.
  3  * Copyright 2013-2014  Intel Mobile Communications GmbH
  4  * Copyright(c) 2015-2016 Intel Deutschland GmbH
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #ifndef STA_INFO_H
 12 #define STA_INFO_H
 13 
 14 #include <linux/list.h>
 15 #include <linux/types.h>
 16 #include <linux/if_ether.h>
 17 #include <linux/workqueue.h>
 18 #include <linux/average.h>
 19 #include <linux/etherdevice.h>
 20 #include <linux/rhashtable.h>
 21 #include <linux/u64_stats_sync.h>
 22 #include "key.h"
 23 
 24 /**
 25  * enum ieee80211_sta_info_flags - Stations flags
 26  *
 27  * These flags are used with &struct sta_info's @flags member, but
 28  * only indirectly with set_sta_flag() and friends.
 29  *
 30  * @WLAN_STA_AUTH: Station is authenticated.
 31  * @WLAN_STA_ASSOC: Station is associated.
 32  * @WLAN_STA_PS_STA: Station is in power-save mode
 33  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
 34  *      This bit is always checked so needs to be enabled for all stations
 35  *      when virtual port control is not in use.
 36  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
 37  *      frames.
 38  * @WLAN_STA_WDS: Station is one of our WDS peers.
 39  * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
 40  *      IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
 41  *      frame to this station is transmitted.
 42  * @WLAN_STA_MFP: Management frame protection is used with this STA.
 43  * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
 44  *      during suspend/resume and station removal.
 45  * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
 46  *      power-save mode logically to flush frames that might still
 47  *      be in the queues
 48  * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
 49  *      station in power-save mode, reply when the driver unblocks.
 50  * @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
 51  * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
 52  *      packets. This means the link is enabled.
 53  * @WLAN_STA_TDLS_INITIATOR: We are the initiator of the TDLS link with this
 54  *      station.
 55  * @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
 56  * @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
 57  *      TDLS peer
 58  * @WLAN_STA_TDLS_WIDER_BW: This TDLS peer supports working on a wider bw on
 59  *      the BSS base channel.
 60  * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
 61  *      keeping station in power-save mode, reply when the driver
 62  *      unblocks the station.
 63  * @WLAN_STA_SP: Station is in a service period, so don't try to
 64  *      reply to other uAPSD trigger frames or PS-Poll.
 65  * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
 66  * @WLAN_STA_INSERTED: This station is inserted into the hash table.
 67  * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
 68  * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
 69  * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
 70  * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
 71  * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX
 72  *      until pending frames are delivered
 73  *
 74  * @NUM_WLAN_STA_FLAGS: number of defined flags
 75  */
 76 enum ieee80211_sta_info_flags {
 77         WLAN_STA_AUTH,
 78         WLAN_STA_ASSOC,
 79         WLAN_STA_PS_STA,
 80         WLAN_STA_AUTHORIZED,
 81         WLAN_STA_SHORT_PREAMBLE,
 82         WLAN_STA_WDS,
 83         WLAN_STA_CLEAR_PS_FILT,
 84         WLAN_STA_MFP,
 85         WLAN_STA_BLOCK_BA,
 86         WLAN_STA_PS_DRIVER,
 87         WLAN_STA_PSPOLL,
 88         WLAN_STA_TDLS_PEER,
 89         WLAN_STA_TDLS_PEER_AUTH,
 90         WLAN_STA_TDLS_INITIATOR,
 91         WLAN_STA_TDLS_CHAN_SWITCH,
 92         WLAN_STA_TDLS_OFF_CHANNEL,
 93         WLAN_STA_TDLS_WIDER_BW,
 94         WLAN_STA_UAPSD,
 95         WLAN_STA_SP,
 96         WLAN_STA_4ADDR_EVENT,
 97         WLAN_STA_INSERTED,
 98         WLAN_STA_RATE_CONTROL,
 99         WLAN_STA_TOFFSET_KNOWN,
100         WLAN_STA_MPSP_OWNER,
101         WLAN_STA_MPSP_RECIPIENT,
102         WLAN_STA_PS_DELIVER,
103 
104         NUM_WLAN_STA_FLAGS,
105 };
106 
107 #define ADDBA_RESP_INTERVAL HZ
108 #define HT_AGG_MAX_RETRIES              15
109 #define HT_AGG_BURST_RETRIES            3
110 #define HT_AGG_RETRIES_PERIOD           (15 * HZ)
111 
112 #define HT_AGG_STATE_DRV_READY          0
113 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
114 #define HT_AGG_STATE_OPERATIONAL        2
115 #define HT_AGG_STATE_STOPPING           3
116 #define HT_AGG_STATE_WANT_START         4
117 #define HT_AGG_STATE_WANT_STOP          5
118 
119 enum ieee80211_agg_stop_reason {
120         AGG_STOP_DECLINED,
121         AGG_STOP_LOCAL_REQUEST,
122         AGG_STOP_PEER_REQUEST,
123         AGG_STOP_DESTROY_STA,
124 };
125 
126 /**
127  * struct tid_ampdu_tx - TID aggregation information (Tx).
128  *
129  * @rcu_head: rcu head for freeing structure
130  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
131  * @addba_resp_timer: timer for peer's response to addba request
132  * @pending: pending frames queue -- use sta's spinlock to protect
133  * @dialog_token: dialog token for aggregation session
134  * @timeout: session timeout value to be filled in ADDBA requests
135  * @state: session state (see above)
136  * @last_tx: jiffies of last tx activity
137  * @stop_initiator: initiator of a session stop
138  * @tx_stop: TX DelBA frame when stopping
139  * @buf_size: reorder buffer size at receiver
140  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
141  * @bar_pending: BAR needs to be re-sent
142  * @amsdu: support A-MSDU withing A-MDPU
143  *
144  * This structure's lifetime is managed by RCU, assignments to
145  * the array holding it must hold the aggregation mutex.
146  *
147  * The TX path can access it under RCU lock-free if, and
148  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
149  * set. Otherwise, the TX path must also acquire the spinlock
150  * and re-check the state, see comments in the tx code
151  * touching it.
152  */
153 struct tid_ampdu_tx {
154         struct rcu_head rcu_head;
155         struct timer_list session_timer;
156         struct timer_list addba_resp_timer;
157         struct sk_buff_head pending;
158         unsigned long state;
159         unsigned long last_tx;
160         u16 timeout;
161         u8 dialog_token;
162         u8 stop_initiator;
163         bool tx_stop;
164         u8 buf_size;
165 
166         u16 failed_bar_ssn;
167         bool bar_pending;
168         bool amsdu;
169 };
170 
171 /**
172  * struct tid_ampdu_rx - TID aggregation information (Rx).
173  *
174  * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
175  *      A-MSDU with individually reported subframes.
176  * @reorder_buf_filtered: bitmap indicating where there are filtered frames in
177  *      the reorder buffer that should be ignored when releasing frames
178  * @reorder_time: jiffies when skb was added
179  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
180  * @reorder_timer: releases expired frames from the reorder buffer.
181  * @last_rx: jiffies of last rx activity
182  * @head_seq_num: head sequence number in reordering buffer.
183  * @stored_mpdu_num: number of MPDUs in reordering buffer
184  * @ssn: Starting Sequence Number expected to be aggregated.
185  * @buf_size: buffer size for incoming A-MPDUs
186  * @timeout: reset timer value (in TUs).
187  * @dialog_token: dialog token for aggregation session
188  * @rcu_head: RCU head used for freeing this struct
189  * @reorder_lock: serializes access to reorder buffer, see below.
190  * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
191  *      and ssn.
192  * @removed: this session is removed (but might have been found due to RCU)
193  *
194  * This structure's lifetime is managed by RCU, assignments to
195  * the array holding it must hold the aggregation mutex.
196  *
197  * The @reorder_lock is used to protect the members of this
198  * struct, except for @timeout, @buf_size and @dialog_token,
199  * which are constant across the lifetime of the struct (the
200  * dialog token being used only for debugging).
201  */
202 struct tid_ampdu_rx {
203         struct rcu_head rcu_head;
204         spinlock_t reorder_lock;
205         u64 reorder_buf_filtered;
206         struct sk_buff_head *reorder_buf;
207         unsigned long *reorder_time;
208         struct timer_list session_timer;
209         struct timer_list reorder_timer;
210         unsigned long last_rx;
211         u16 head_seq_num;
212         u16 stored_mpdu_num;
213         u16 ssn;
214         u16 buf_size;
215         u16 timeout;
216         u8 dialog_token;
217         bool auto_seq;
218         bool removed;
219 };
220 
221 /**
222  * struct sta_ampdu_mlme - STA aggregation information.
223  *
224  * @mtx: mutex to protect all TX data (except non-NULL assignments
225  *      to tid_tx[idx], which are protected by the sta spinlock)
226  *      tid_start_tx is also protected by sta->lock.
227  * @tid_rx: aggregation info for Rx per TID -- RCU protected
228  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
229  *      RX timer expired until the work for it runs
230  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
231  *      driver requested to close until the work for it runs
232  * @agg_session_valid: bitmap indicating which TID has a rx BA session open on
233  * @work: work struct for starting/stopping aggregation
234  * @tid_tx: aggregation info for Tx per TID
235  * @tid_start_tx: sessions where start was requested
236  * @last_addba_req_time: timestamp of the last addBA request.
237  * @addba_req_num: number of times addBA request has been sent.
238  * @dialog_token_allocator: dialog token enumerator for each new session;
239  */
240 struct sta_ampdu_mlme {
241         struct mutex mtx;
242         /* rx */
243         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
244         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
245         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
246         unsigned long agg_session_valid[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
247         /* tx */
248         struct work_struct work;
249         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
250         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
251         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
252         u8 addba_req_num[IEEE80211_NUM_TIDS];
253         u8 dialog_token_allocator;
254 };
255 
256 
257 /* Value to indicate no TID reservation */
258 #define IEEE80211_TID_UNRESERVED        0xff
259 
260 #define IEEE80211_FAST_XMIT_MAX_IV      18
261 
262 /**
263  * struct ieee80211_fast_tx - TX fastpath information
264  * @key: key to use for hw crypto
265  * @hdr: the 802.11 header to put with the frame
266  * @hdr_len: actual 802.11 header length
267  * @sa_offs: offset of the SA
268  * @da_offs: offset of the DA
269  * @pn_offs: offset where to put PN for crypto (or 0 if not needed)
270  * @band: band this will be transmitted on, for tx_info
271  * @rcu_head: RCU head to free this struct
272  *
273  * This struct is small enough so that the common case (maximum crypto
274  * header length of 8 like for CCMP/GCMP) fits into a single 64-byte
275  * cache line.
276  */
277 struct ieee80211_fast_tx {
278         struct ieee80211_key *key;
279         u8 hdr_len;
280         u8 sa_offs, da_offs, pn_offs;
281         u8 band;
282         u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
283                sizeof(rfc1042_header)] __aligned(2);
284 
285         struct rcu_head rcu_head;
286 };
287 
288 /**
289  * struct ieee80211_fast_rx - RX fastpath information
290  * @dev: netdevice for reporting the SKB
291  * @vif_type: (P2P-less) interface type of the original sdata (sdata->vif.type)
292  * @vif_addr: interface address
293  * @rfc1042_hdr: copy of the RFC 1042 SNAP header (to have in cache)
294  * @control_port_protocol: control port protocol copied from sdata
295  * @expected_ds_bits: from/to DS bits expected
296  * @icv_len: length of the MIC if present
297  * @key: bool indicating encryption is expected (key is set)
298  * @sta_notify: notify the MLME code (once)
299  * @internal_forward: forward froms internally on AP/VLAN type interfaces
300  * @uses_rss: copy of USES_RSS hw flag
301  * @da_offs: offset of the DA in the header (for header conversion)
302  * @sa_offs: offset of the SA in the header (for header conversion)
303  * @rcu_head: RCU head for freeing this structure
304  */
305 struct ieee80211_fast_rx {
306         struct net_device *dev;
307         enum nl80211_iftype vif_type;
308         u8 vif_addr[ETH_ALEN] __aligned(2);
309         u8 rfc1042_hdr[6] __aligned(2);
310         __be16 control_port_protocol;
311         __le16 expected_ds_bits;
312         u8 icv_len;
313         u8 key:1,
314            sta_notify:1,
315            internal_forward:1,
316            uses_rss:1;
317         u8 da_offs, sa_offs;
318 
319         struct rcu_head rcu_head;
320 };
321 
322 /**
323  * struct mesh_sta - mesh STA information
324  * @plink_lock: serialize access to plink fields
325  * @llid: Local link ID
326  * @plid: Peer link ID
327  * @aid: local aid supplied by peer
328  * @reason: Cancel reason on PLINK_HOLDING state
329  * @plink_retries: Retries in establishment
330  * @plink_state: peer link state
331  * @plink_timeout: timeout of peer link
332  * @plink_timer: peer link watch timer
333  * @t_offset: timing offset relative to this host
334  * @t_offset_setpoint: reference timing offset of this sta to be used when
335  *      calculating clockdrift
336  * @local_pm: local link-specific power save mode
337  * @peer_pm: peer-specific power save mode towards local STA
338  * @nonpeer_pm: STA power save mode towards non-peer neighbors
339  * @processed_beacon: set to true after peer rates and capabilities are
340  *      processed
341  * @fail_avg: moving percentage of failed MSDUs
342  */
343 struct mesh_sta {
344         struct timer_list plink_timer;
345 
346         s64 t_offset;
347         s64 t_offset_setpoint;
348 
349         spinlock_t plink_lock;
350         u16 llid;
351         u16 plid;
352         u16 aid;
353         u16 reason;
354         u8 plink_retries;
355 
356         bool processed_beacon;
357 
358         enum nl80211_plink_state plink_state;
359         u32 plink_timeout;
360 
361         /* mesh power save */
362         enum nl80211_mesh_power_mode local_pm;
363         enum nl80211_mesh_power_mode peer_pm;
364         enum nl80211_mesh_power_mode nonpeer_pm;
365 
366         /* moving percentage of failed MSDUs */
367         unsigned int fail_avg;
368 };
369 
370 DECLARE_EWMA(signal, 1024, 8)
371 
372 struct ieee80211_sta_rx_stats {
373         unsigned long packets;
374         unsigned long last_rx;
375         unsigned long num_duplicates;
376         unsigned long fragments;
377         unsigned long dropped;
378         int last_signal;
379         u8 chains;
380         s8 chain_signal_last[IEEE80211_MAX_CHAINS];
381         u16 last_rate;
382         struct u64_stats_sync syncp;
383         u64 bytes;
384         u64 msdu[IEEE80211_NUM_TIDS + 1];
385 };
386 
387 /**
388  * struct sta_info - STA information
389  *
390  * This structure collects information about a station that
391  * mac80211 is communicating with.
392  *
393  * @list: global linked list entry
394  * @free_list: list entry for keeping track of stations to free
395  * @hash_node: hash node for rhashtable
396  * @addr: station's MAC address - duplicated from public part to
397  *      let the hash table work with just a single cacheline
398  * @local: pointer to the global information
399  * @sdata: virtual interface this station belongs to
400  * @ptk: peer keys negotiated with this station, if any
401  * @ptk_idx: last installed peer key index
402  * @gtk: group keys negotiated with this station, if any
403  * @rate_ctrl: rate control algorithm reference
404  * @rate_ctrl_lock: spinlock used to protect rate control data
405  *      (data inside the algorithm, so serializes calls there)
406  * @rate_ctrl_priv: rate control private per-STA pointer
407  * @lock: used for locking all fields that require locking, see comments
408  *      in the header file.
409  * @drv_deliver_wk: used for delivering frames after driver PS unblocking
410  * @listen_interval: listen interval of this station, when we're acting as AP
411  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
412  * @ps_lock: used for powersave (when mac80211 is the AP) related locking
413  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
414  *      when it leaves power saving state or polls
415  * @tx_filtered: buffers (per AC) of frames we already tried to
416  *      transmit but were filtered by hardware due to STA having
417  *      entered power saving state, these are also delivered to
418  *      the station when it leaves powersave or polls for frames
419  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
420  * @txq_buffered_tids: bitmap of TIDs that mac80211 has txq data buffered on
421  * @last_connected: time (in seconds) when a station got connected
422  * @last_seq_ctrl: last received seq/frag number from this STA (per TID
423  *      plus one for non-QoS frames)
424  * @tid_seq: per-TID sequence numbers for sending to this STA
425  * @ampdu_mlme: A-MPDU state machine state
426  * @timer_to_tid: identity mapping to ID timers
427  * @mesh: mesh STA information
428  * @debugfs_dir: debug filesystem directory dentry
429  * @dead: set to true when sta is unlinked
430  * @removed: set to true when sta is being removed from sta_list
431  * @uploaded: set to true when sta is uploaded to the driver
432  * @sta: station information we share with the driver
433  * @sta_state: duplicates information about station state (for debug)
434  * @rcu_head: RCU head used for freeing this station struct
435  * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
436  *      taken from HT/VHT capabilities or VHT operating mode notification
437  * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
438  *      AP only.
439  * @cipher_scheme: optional cipher scheme for this station
440  * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)
441  * @fast_tx: TX fastpath information
442  * @fast_rx: RX fastpath information
443  * @tdls_chandef: a TDLS peer can have a wider chandef that is compatible to
444  *      the BSS one.
445  * @tx_stats: TX statistics
446  * @rx_stats: RX statistics
447  * @pcpu_rx_stats: per-CPU RX statistics, assigned only if the driver needs
448  *      this (by advertising the USES_RSS hw flag)
449  * @status_stats: TX status statistics
450  */
451 struct sta_info {
452         /* General information, mostly static */
453         struct list_head list, free_list;
454         struct rcu_head rcu_head;
455         struct rhash_head hash_node;
456         u8 addr[ETH_ALEN];
457         struct ieee80211_local *local;
458         struct ieee80211_sub_if_data *sdata;
459         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
460         struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
461         u8 ptk_idx;
462         struct rate_control_ref *rate_ctrl;
463         void *rate_ctrl_priv;
464         spinlock_t rate_ctrl_lock;
465         spinlock_t lock;
466 
467         struct ieee80211_fast_tx __rcu *fast_tx;
468         struct ieee80211_fast_rx __rcu *fast_rx;
469         struct ieee80211_sta_rx_stats __percpu *pcpu_rx_stats;
470 
471 #ifdef CONFIG_MAC80211_MESH
472         struct mesh_sta *mesh;
473 #endif
474 
475         struct work_struct drv_deliver_wk;
476 
477         u16 listen_interval;
478 
479         bool dead;
480         bool removed;
481 
482         bool uploaded;
483 
484         enum ieee80211_sta_state sta_state;
485 
486         /* use the accessors defined below */
487         unsigned long _flags;
488 
489         /* STA powersave lock and frame queues */
490         spinlock_t ps_lock;
491         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
492         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
493         unsigned long driver_buffered_tids;
494         unsigned long txq_buffered_tids;
495 
496         long last_connected;
497 
498         /* Updated from RX path only, no locking requirements */
499         struct ieee80211_sta_rx_stats rx_stats;
500         struct {
501                 struct ewma_signal signal;
502                 struct ewma_signal chain_signal[IEEE80211_MAX_CHAINS];
503         } rx_stats_avg;
504 
505         /* Plus 1 for non-QoS frames */
506         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
507 
508         /* Updated from TX status path only, no locking requirements */
509         struct {
510                 unsigned long filtered;
511                 unsigned long retry_failed, retry_count;
512                 unsigned int lost_packets;
513                 unsigned long last_tdls_pkt_time;
514                 u64 msdu_retries[IEEE80211_NUM_TIDS + 1];
515                 u64 msdu_failed[IEEE80211_NUM_TIDS + 1];
516                 unsigned long last_ack;
517         } status_stats;
518 
519         /* Updated from TX path only, no locking requirements */
520         struct {
521                 u64 packets[IEEE80211_NUM_ACS];
522                 u64 bytes[IEEE80211_NUM_ACS];
523                 struct ieee80211_tx_rate last_rate;
524                 u64 msdu[IEEE80211_NUM_TIDS + 1];
525         } tx_stats;
526         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
527 
528         /*
529          * Aggregation information, locked with lock.
530          */
531         struct sta_ampdu_mlme ampdu_mlme;
532         u8 timer_to_tid[IEEE80211_NUM_TIDS];
533 
534 #ifdef CONFIG_MAC80211_DEBUGFS
535         struct dentry *debugfs_dir;
536 #endif
537 
538         enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
539 
540         enum ieee80211_smps_mode known_smps_mode;
541         const struct ieee80211_cipher_scheme *cipher_scheme;
542 
543         u8 reserved_tid;
544 
545         struct cfg80211_chan_def tdls_chandef;
546 
547         /* keep last! */
548         struct ieee80211_sta sta;
549 };
550 
551 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
552 {
553 #ifdef CONFIG_MAC80211_MESH
554         return sta->mesh->plink_state;
555 #endif
556         return NL80211_PLINK_LISTEN;
557 }
558 
559 static inline void set_sta_flag(struct sta_info *sta,
560                                 enum ieee80211_sta_info_flags flag)
561 {
562         WARN_ON(flag == WLAN_STA_AUTH ||
563                 flag == WLAN_STA_ASSOC ||
564                 flag == WLAN_STA_AUTHORIZED);
565         set_bit(flag, &sta->_flags);
566 }
567 
568 static inline void clear_sta_flag(struct sta_info *sta,
569                                   enum ieee80211_sta_info_flags flag)
570 {
571         WARN_ON(flag == WLAN_STA_AUTH ||
572                 flag == WLAN_STA_ASSOC ||
573                 flag == WLAN_STA_AUTHORIZED);
574         clear_bit(flag, &sta->_flags);
575 }
576 
577 static inline int test_sta_flag(struct sta_info *sta,
578                                 enum ieee80211_sta_info_flags flag)
579 {
580         return test_bit(flag, &sta->_flags);
581 }
582 
583 static inline int test_and_clear_sta_flag(struct sta_info *sta,
584                                           enum ieee80211_sta_info_flags flag)
585 {
586         WARN_ON(flag == WLAN_STA_AUTH ||
587                 flag == WLAN_STA_ASSOC ||
588                 flag == WLAN_STA_AUTHORIZED);
589         return test_and_clear_bit(flag, &sta->_flags);
590 }
591 
592 static inline int test_and_set_sta_flag(struct sta_info *sta,
593                                         enum ieee80211_sta_info_flags flag)
594 {
595         WARN_ON(flag == WLAN_STA_AUTH ||
596                 flag == WLAN_STA_ASSOC ||
597                 flag == WLAN_STA_AUTHORIZED);
598         return test_and_set_bit(flag, &sta->_flags);
599 }
600 
601 int sta_info_move_state(struct sta_info *sta,
602                         enum ieee80211_sta_state new_state);
603 
604 static inline void sta_info_pre_move_state(struct sta_info *sta,
605                                            enum ieee80211_sta_state new_state)
606 {
607         int ret;
608 
609         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
610 
611         ret = sta_info_move_state(sta, new_state);
612         WARN_ON_ONCE(ret);
613 }
614 
615 
616 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
617                              struct tid_ampdu_tx *tid_tx);
618 
619 static inline struct tid_ampdu_tx *
620 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
621 {
622         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
623                                          lockdep_is_held(&sta->lock) ||
624                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
625 }
626 
627 /* Maximum number of frames to buffer per power saving station per AC */
628 #define STA_MAX_TX_BUFFER       64
629 
630 /* Minimum buffered frame expiry time. If STA uses listen interval that is
631  * smaller than this value, the minimum value here is used instead. */
632 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
633 
634 /* How often station data is cleaned up (e.g., expiration of buffered frames)
635  */
636 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
637 
638 /*
639  * Get a STA info, must be under RCU read lock.
640  */
641 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
642                               const u8 *addr);
643 
644 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
645                                   const u8 *addr);
646 
647 u32 sta_addr_hash(const void *key, u32 length, u32 seed);
648 
649 #define _sta_bucket_idx(_tbl, _a)                                       \
650         rht_bucket_index(_tbl, sta_addr_hash(_a, ETH_ALEN, (_tbl)->hash_rnd))
651 
652 #define for_each_sta_info(local, tbl, _addr, _sta, _tmp)                \
653         rht_for_each_entry_rcu(_sta, _tmp, tbl,                         \
654                                _sta_bucket_idx(tbl, _addr),             \
655                                hash_node)                               \
656         /* compare address and run code only if it matches */           \
657         if (ether_addr_equal(_sta->addr, (_addr)))
658 
659 /*
660  * Get STA info by index, BROKEN!
661  */
662 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
663                                      int idx);
664 /*
665  * Create a new STA info, caller owns returned structure
666  * until sta_info_insert().
667  */
668 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
669                                 const u8 *addr, gfp_t gfp);
670 
671 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
672 
673 /*
674  * Insert STA info into hash table/list, returns zero or a
675  * -EEXIST if (if the same MAC address is already present).
676  *
677  * Calling the non-rcu version makes the caller relinquish,
678  * the _rcu version calls read_lock_rcu() and must be called
679  * without it held.
680  */
681 int sta_info_insert(struct sta_info *sta);
682 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
683 
684 int __must_check __sta_info_destroy(struct sta_info *sta);
685 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
686                           const u8 *addr);
687 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
688                               const u8 *addr);
689 
690 void sta_info_recalc_tim(struct sta_info *sta);
691 
692 int sta_info_init(struct ieee80211_local *local);
693 void sta_info_stop(struct ieee80211_local *local);
694 
695 /**
696  * sta_info_flush - flush matching STA entries from the STA table
697  *
698  * Returns the number of removed STA entries.
699  *
700  * @sdata: sdata to remove all stations from
701  * @vlans: if the given interface is an AP interface, also flush VLANs
702  */
703 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
704 
705 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
706 {
707         return __sta_info_flush(sdata, false);
708 }
709 
710 void sta_set_rate_info_tx(struct sta_info *sta,
711                           const struct ieee80211_tx_rate *rate,
712                           struct rate_info *rinfo);
713 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo);
714 
715 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
716                           unsigned long exp_time);
717 u8 sta_info_tx_streams(struct sta_info *sta);
718 
719 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
720 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
721 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
722 
723 unsigned long ieee80211_sta_last_active(struct sta_info *sta);
724 
725 #define STA_STATS_RATE_INVALID          0
726 #define STA_STATS_RATE_VHT              0x8000
727 #define STA_STATS_RATE_HT               0x4000
728 #define STA_STATS_RATE_LEGACY           0x2000
729 #define STA_STATS_RATE_SGI              0x1000
730 #define STA_STATS_RATE_BW_SHIFT         9
731 #define STA_STATS_RATE_BW_MASK          (0x7 << STA_STATS_RATE_BW_SHIFT)
732 
733 static inline u16 sta_stats_encode_rate(struct ieee80211_rx_status *s)
734 {
735         u16 r = s->rate_idx;
736 
737         if (s->vht_flag & RX_VHT_FLAG_80MHZ)
738                 r |= RATE_INFO_BW_80 << STA_STATS_RATE_BW_SHIFT;
739         else if (s->vht_flag & RX_VHT_FLAG_160MHZ)
740                 r |= RATE_INFO_BW_160 << STA_STATS_RATE_BW_SHIFT;
741         else if (s->flag & RX_FLAG_40MHZ)
742                 r |= RATE_INFO_BW_40 << STA_STATS_RATE_BW_SHIFT;
743         else if (s->flag & RX_FLAG_10MHZ)
744                 r |= RATE_INFO_BW_10 << STA_STATS_RATE_BW_SHIFT;
745         else if (s->flag & RX_FLAG_5MHZ)
746                 r |= RATE_INFO_BW_5 << STA_STATS_RATE_BW_SHIFT;
747         else
748                 r |= RATE_INFO_BW_20 << STA_STATS_RATE_BW_SHIFT;
749 
750         if (s->flag & RX_FLAG_SHORT_GI)
751                 r |= STA_STATS_RATE_SGI;
752 
753         if (s->flag & RX_FLAG_VHT)
754                 r |= STA_STATS_RATE_VHT | (s->vht_nss << 4);
755         else if (s->flag & RX_FLAG_HT)
756                 r |= STA_STATS_RATE_HT;
757         else
758                 r |= STA_STATS_RATE_LEGACY | (s->band << 4);
759 
760         return r;
761 }
762 
763 #endif /* STA_INFO_H */
764 

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