mac80211.h revision c555b9b3713e05586fabe85f4e46f28859e72930
1/* 2 * mac80211 <-> driver interface 3 * 4 * Copyright 2002-2005, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#ifndef MAC80211_H 14#define MAC80211_H 15 16#include <linux/kernel.h> 17#include <linux/if_ether.h> 18#include <linux/skbuff.h> 19#include <linux/wireless.h> 20#include <linux/device.h> 21#include <linux/ieee80211.h> 22#include <net/cfg80211.h> 23 24/** 25 * DOC: Introduction 26 * 27 * mac80211 is the Linux stack for 802.11 hardware that implements 28 * only partial functionality in hard- or firmware. This document 29 * defines the interface between mac80211 and low-level hardware 30 * drivers. 31 */ 32 33/** 34 * DOC: Calling mac80211 from interrupts 35 * 36 * Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be 37 * called in hardware interrupt context. The low-level driver must not call any 38 * other functions in hardware interrupt context. If there is a need for such 39 * call, the low-level driver should first ACK the interrupt and perform the 40 * IEEE 802.11 code call after this, e.g. from a scheduled workqueue or even 41 * tasklet function. 42 * 43 * NOTE: If the driver opts to use the _irqsafe() functions, it may not also 44 * use the non-IRQ-safe functions! 45 */ 46 47/** 48 * DOC: Warning 49 * 50 * If you're reading this document and not the header file itself, it will 51 * be incomplete because not all documentation has been converted yet. 52 */ 53 54/** 55 * DOC: Frame format 56 * 57 * As a general rule, when frames are passed between mac80211 and the driver, 58 * they start with the IEEE 802.11 header and include the same octets that are 59 * sent over the air except for the FCS which should be calculated by the 60 * hardware. 61 * 62 * There are, however, various exceptions to this rule for advanced features: 63 * 64 * The first exception is for hardware encryption and decryption offload 65 * where the IV/ICV may or may not be generated in hardware. 66 * 67 * Secondly, when the hardware handles fragmentation, the frame handed to 68 * the driver from mac80211 is the MSDU, not the MPDU. 69 * 70 * Finally, for received frames, the driver is able to indicate that it has 71 * filled a radiotap header and put that in front of the frame; if it does 72 * not do so then mac80211 may add this under certain circumstances. 73 */ 74 75/** 76 * DOC: mac80211 workqueue 77 * 78 * mac80211 provides its own workqueue for drivers and internal mac80211 use. 79 * The workqueue is a single threaded workqueue and can only be accessed by 80 * helpers for sanity checking. Drivers must ensure all work added onto the 81 * mac80211 workqueue should be cancelled on the driver stop() callback. 82 * 83 * mac80211 will flushed the workqueue upon interface removal and during 84 * suspend. 85 * 86 * All work performed on the mac80211 workqueue must not acquire the RTNL lock. 87 * 88 */ 89 90/** 91 * enum ieee80211_max_queues - maximum number of queues 92 * 93 * @IEEE80211_MAX_QUEUES: Maximum number of regular device queues. 94 */ 95enum ieee80211_max_queues { 96 IEEE80211_MAX_QUEUES = 4, 97}; 98 99/** 100 * struct ieee80211_tx_queue_params - transmit queue configuration 101 * 102 * The information provided in this structure is required for QoS 103 * transmit queue configuration. Cf. IEEE 802.11 7.3.2.29. 104 * 105 * @aifs: arbitration interframe space [0..255] 106 * @cw_min: minimum contention window [a value of the form 107 * 2^n-1 in the range 1..32767] 108 * @cw_max: maximum contention window [like @cw_min] 109 * @txop: maximum burst time in units of 32 usecs, 0 meaning disabled 110 */ 111struct ieee80211_tx_queue_params { 112 u16 txop; 113 u16 cw_min; 114 u16 cw_max; 115 u8 aifs; 116}; 117 118/** 119 * struct ieee80211_tx_queue_stats - transmit queue statistics 120 * 121 * @len: number of packets in queue 122 * @limit: queue length limit 123 * @count: number of frames sent 124 */ 125struct ieee80211_tx_queue_stats { 126 unsigned int len; 127 unsigned int limit; 128 unsigned int count; 129}; 130 131struct ieee80211_low_level_stats { 132 unsigned int dot11ACKFailureCount; 133 unsigned int dot11RTSFailureCount; 134 unsigned int dot11FCSErrorCount; 135 unsigned int dot11RTSSuccessCount; 136}; 137 138/** 139 * enum ieee80211_bss_change - BSS change notification flags 140 * 141 * These flags are used with the bss_info_changed() callback 142 * to indicate which BSS parameter changed. 143 * 144 * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated), 145 * also implies a change in the AID. 146 * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed 147 * @BSS_CHANGED_ERP_PREAMBLE: preamble changed 148 * @BSS_CHANGED_ERP_SLOT: slot timing changed 149 * @BSS_CHANGED_HT: 802.11n parameters changed 150 * @BSS_CHANGED_BASIC_RATES: Basic rateset changed 151 * @BSS_CHANGED_BEACON_INT: Beacon interval changed 152 * @BSS_CHANGED_BSSID: BSSID changed, for whatever 153 * reason (IBSS and managed mode) 154 * @BSS_CHANGED_BEACON: Beacon data changed, retrieve 155 * new beacon (beaconing modes) 156 * @BSS_CHANGED_BEACON_ENABLED: Beaconing should be 157 * enabled/disabled (beaconing modes) 158 */ 159enum ieee80211_bss_change { 160 BSS_CHANGED_ASSOC = 1<<0, 161 BSS_CHANGED_ERP_CTS_PROT = 1<<1, 162 BSS_CHANGED_ERP_PREAMBLE = 1<<2, 163 BSS_CHANGED_ERP_SLOT = 1<<3, 164 BSS_CHANGED_HT = 1<<4, 165 BSS_CHANGED_BASIC_RATES = 1<<5, 166 BSS_CHANGED_BEACON_INT = 1<<6, 167 BSS_CHANGED_BSSID = 1<<7, 168 BSS_CHANGED_BEACON = 1<<8, 169 BSS_CHANGED_BEACON_ENABLED = 1<<9, 170}; 171 172/** 173 * struct ieee80211_bss_conf - holds the BSS's changing parameters 174 * 175 * This structure keeps information about a BSS (and an association 176 * to that BSS) that can change during the lifetime of the BSS. 177 * 178 * @assoc: association status 179 * @aid: association ID number, valid only when @assoc is true 180 * @use_cts_prot: use CTS protection 181 * @use_short_preamble: use 802.11b short preamble; 182 * if the hardware cannot handle this it must set the 183 * IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag 184 * @use_short_slot: use short slot time (only relevant for ERP); 185 * if the hardware cannot handle this it must set the 186 * IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag 187 * @dtim_period: num of beacons before the next DTIM, for PSM 188 * @timestamp: beacon timestamp 189 * @beacon_int: beacon interval 190 * @assoc_capability: capabilities taken from assoc resp 191 * @basic_rates: bitmap of basic rates, each bit stands for an 192 * index into the rate table configured by the driver in 193 * the current band. 194 * @bssid: The BSSID for this BSS 195 * @enable_beacon: whether beaconing should be enabled or not 196 * @ht_operation_mode: HT operation mode (like in &struct ieee80211_ht_info). 197 * This field is only valid when the channel type is one of the HT types. 198 */ 199struct ieee80211_bss_conf { 200 const u8 *bssid; 201 /* association related data */ 202 bool assoc; 203 u16 aid; 204 /* erp related data */ 205 bool use_cts_prot; 206 bool use_short_preamble; 207 bool use_short_slot; 208 bool enable_beacon; 209 u8 dtim_period; 210 u16 beacon_int; 211 u16 assoc_capability; 212 u64 timestamp; 213 u32 basic_rates; 214 u16 ht_operation_mode; 215}; 216 217/** 218 * enum mac80211_tx_control_flags - flags to describe transmission information/status 219 * 220 * These flags are used with the @flags member of &ieee80211_tx_info. 221 * 222 * @IEEE80211_TX_CTL_REQ_TX_STATUS: request TX status callback for this frame. 223 * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence 224 * number to this frame, taking care of not overwriting the fragment 225 * number and increasing the sequence number only when the 226 * IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly 227 * assign sequence numbers to QoS-data frames but cannot do so correctly 228 * for non-QoS-data and management frames because beacons need them from 229 * that counter as well and mac80211 cannot guarantee proper sequencing. 230 * If this flag is set, the driver should instruct the hardware to 231 * assign a sequence number to the frame or assign one itself. Cf. IEEE 232 * 802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for 233 * beacons and always be clear for frames without a sequence number field. 234 * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack 235 * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination 236 * station 237 * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame 238 * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon 239 * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU 240 * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211. 241 * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted 242 * because the destination STA was in powersave mode. 243 * @IEEE80211_TX_STAT_ACK: Frame was acknowledged 244 * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status 245 * is for the whole aggregation. 246 * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned, 247 * so consider using block ack request (BAR). 248 * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be 249 * set by rate control algorithms to indicate probe rate, will 250 * be cleared for fragmented frames (except on the last fragment) 251 * @IEEE80211_TX_INTFL_RCALGO: mac80211 internal flag, do not test or 252 * set this flag in the driver; indicates that the rate control 253 * algorithm was used and should be notified of TX status 254 * @IEEE80211_TX_INTFL_NEED_TXPROCESSING: completely internal to mac80211, 255 * used to indicate that a pending frame requires TX processing before 256 * it can be sent out. 257 * @IEEE80211_TX_INTFL_RETRIED: completely internal to mac80211, 258 * used to indicate that a frame was already retried due to PS 259 * @IEEE80211_TX_INTFL_DONT_ENCRYPT: completely internal to mac80211, 260 * used to indicate frame should not be encrypted 261 * @IEEE80211_TX_CTL_PSPOLL_RESPONSE: (internal?) 262 * This frame is a response to a PS-poll frame and should be sent 263 * although the station is in powersave mode. 264 */ 265enum mac80211_tx_control_flags { 266 IEEE80211_TX_CTL_REQ_TX_STATUS = BIT(0), 267 IEEE80211_TX_CTL_ASSIGN_SEQ = BIT(1), 268 IEEE80211_TX_CTL_NO_ACK = BIT(2), 269 IEEE80211_TX_CTL_CLEAR_PS_FILT = BIT(3), 270 IEEE80211_TX_CTL_FIRST_FRAGMENT = BIT(4), 271 IEEE80211_TX_CTL_SEND_AFTER_DTIM = BIT(5), 272 IEEE80211_TX_CTL_AMPDU = BIT(6), 273 IEEE80211_TX_CTL_INJECTED = BIT(7), 274 IEEE80211_TX_STAT_TX_FILTERED = BIT(8), 275 IEEE80211_TX_STAT_ACK = BIT(9), 276 IEEE80211_TX_STAT_AMPDU = BIT(10), 277 IEEE80211_TX_STAT_AMPDU_NO_BACK = BIT(11), 278 IEEE80211_TX_CTL_RATE_CTRL_PROBE = BIT(12), 279 IEEE80211_TX_INTFL_RCALGO = BIT(13), 280 IEEE80211_TX_INTFL_NEED_TXPROCESSING = BIT(14), 281 IEEE80211_TX_INTFL_RETRIED = BIT(15), 282 IEEE80211_TX_INTFL_DONT_ENCRYPT = BIT(16), 283 IEEE80211_TX_CTL_PSPOLL_RESPONSE = BIT(17), 284}; 285 286/** 287 * enum mac80211_rate_control_flags - per-rate flags set by the 288 * Rate Control algorithm. 289 * 290 * These flags are set by the Rate control algorithm for each rate during tx, 291 * in the @flags member of struct ieee80211_tx_rate. 292 * 293 * @IEEE80211_TX_RC_USE_RTS_CTS: Use RTS/CTS exchange for this rate. 294 * @IEEE80211_TX_RC_USE_CTS_PROTECT: CTS-to-self protection is required. 295 * This is set if the current BSS requires ERP protection. 296 * @IEEE80211_TX_RC_USE_SHORT_PREAMBLE: Use short preamble. 297 * @IEEE80211_TX_RC_MCS: HT rate. 298 * @IEEE80211_TX_RC_GREEN_FIELD: Indicates whether this rate should be used in 299 * Greenfield mode. 300 * @IEEE80211_TX_RC_40_MHZ_WIDTH: Indicates if the Channel Width should be 40 MHz. 301 * @IEEE80211_TX_RC_DUP_DATA: The frame should be transmitted on both of the 302 * adjacent 20 MHz channels, if the current channel type is 303 * NL80211_CHAN_HT40MINUS or NL80211_CHAN_HT40PLUS. 304 * @IEEE80211_TX_RC_SHORT_GI: Short Guard interval should be used for this rate. 305 */ 306enum mac80211_rate_control_flags { 307 IEEE80211_TX_RC_USE_RTS_CTS = BIT(0), 308 IEEE80211_TX_RC_USE_CTS_PROTECT = BIT(1), 309 IEEE80211_TX_RC_USE_SHORT_PREAMBLE = BIT(2), 310 311 /* rate index is an MCS rate number instead of an index */ 312 IEEE80211_TX_RC_MCS = BIT(3), 313 IEEE80211_TX_RC_GREEN_FIELD = BIT(4), 314 IEEE80211_TX_RC_40_MHZ_WIDTH = BIT(5), 315 IEEE80211_TX_RC_DUP_DATA = BIT(6), 316 IEEE80211_TX_RC_SHORT_GI = BIT(7), 317}; 318 319 320/* there are 40 bytes if you don't need the rateset to be kept */ 321#define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40 322 323/* if you do need the rateset, then you have less space */ 324#define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24 325 326/* maximum number of rate stages */ 327#define IEEE80211_TX_MAX_RATES 5 328 329/** 330 * struct ieee80211_tx_rate - rate selection/status 331 * 332 * @idx: rate index to attempt to send with 333 * @flags: rate control flags (&enum mac80211_rate_control_flags) 334 * @count: number of tries in this rate before going to the next rate 335 * 336 * A value of -1 for @idx indicates an invalid rate and, if used 337 * in an array of retry rates, that no more rates should be tried. 338 * 339 * When used for transmit status reporting, the driver should 340 * always report the rate along with the flags it used. 341 * 342 * &struct ieee80211_tx_info contains an array of these structs 343 * in the control information, and it will be filled by the rate 344 * control algorithm according to what should be sent. For example, 345 * if this array contains, in the format { <idx>, <count> } the 346 * information 347 * { 3, 2 }, { 2, 2 }, { 1, 4 }, { -1, 0 }, { -1, 0 } 348 * then this means that the frame should be transmitted 349 * up to twice at rate 3, up to twice at rate 2, and up to four 350 * times at rate 1 if it doesn't get acknowledged. Say it gets 351 * acknowledged by the peer after the fifth attempt, the status 352 * information should then contain 353 * { 3, 2 }, { 2, 2 }, { 1, 1 }, { -1, 0 } ... 354 * since it was transmitted twice at rate 3, twice at rate 2 355 * and once at rate 1 after which we received an acknowledgement. 356 */ 357struct ieee80211_tx_rate { 358 s8 idx; 359 u8 count; 360 u8 flags; 361} __attribute__((packed)); 362 363/** 364 * struct ieee80211_tx_info - skb transmit information 365 * 366 * This structure is placed in skb->cb for three uses: 367 * (1) mac80211 TX control - mac80211 tells the driver what to do 368 * (2) driver internal use (if applicable) 369 * (3) TX status information - driver tells mac80211 what happened 370 * 371 * The TX control's sta pointer is only valid during the ->tx call, 372 * it may be NULL. 373 * 374 * @flags: transmit info flags, defined above 375 * @band: the band to transmit on (use for checking for races) 376 * @antenna_sel_tx: antenna to use, 0 for automatic diversity 377 * @pad: padding, ignore 378 * @control: union for control data 379 * @status: union for status data 380 * @driver_data: array of driver_data pointers 381 * @ampdu_ack_len: number of aggregated frames. 382 * relevant only if IEEE80211_TX_STATUS_AMPDU was set. 383 * @ampdu_ack_map: block ack bit map for the aggregation. 384 * relevant only if IEEE80211_TX_STATUS_AMPDU was set. 385 * @ack_signal: signal strength of the ACK frame 386 */ 387struct ieee80211_tx_info { 388 /* common information */ 389 u32 flags; 390 u8 band; 391 392 u8 antenna_sel_tx; 393 394 /* 2 byte hole */ 395 u8 pad[2]; 396 397 union { 398 struct { 399 union { 400 /* rate control */ 401 struct { 402 struct ieee80211_tx_rate rates[ 403 IEEE80211_TX_MAX_RATES]; 404 s8 rts_cts_rate_idx; 405 }; 406 /* only needed before rate control */ 407 unsigned long jiffies; 408 }; 409 /* NB: vif can be NULL for injected frames */ 410 struct ieee80211_vif *vif; 411 struct ieee80211_key_conf *hw_key; 412 struct ieee80211_sta *sta; 413 } control; 414 struct { 415 struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES]; 416 u8 ampdu_ack_len; 417 u64 ampdu_ack_map; 418 int ack_signal; 419 /* 8 bytes free */ 420 } status; 421 struct { 422 struct ieee80211_tx_rate driver_rates[ 423 IEEE80211_TX_MAX_RATES]; 424 void *rate_driver_data[ 425 IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)]; 426 }; 427 void *driver_data[ 428 IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)]; 429 }; 430}; 431 432static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb) 433{ 434 return (struct ieee80211_tx_info *)skb->cb; 435} 436 437static inline struct ieee80211_rx_status *IEEE80211_SKB_RXCB(struct sk_buff *skb) 438{ 439 return (struct ieee80211_rx_status *)skb->cb; 440} 441 442/** 443 * ieee80211_tx_info_clear_status - clear TX status 444 * 445 * @info: The &struct ieee80211_tx_info to be cleared. 446 * 447 * When the driver passes an skb back to mac80211, it must report 448 * a number of things in TX status. This function clears everything 449 * in the TX status but the rate control information (it does clear 450 * the count since you need to fill that in anyway). 451 * 452 * NOTE: You can only use this function if you do NOT use 453 * info->driver_data! Use info->rate_driver_data 454 * instead if you need only the less space that allows. 455 */ 456static inline void 457ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info) 458{ 459 int i; 460 461 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 462 offsetof(struct ieee80211_tx_info, control.rates)); 463 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 464 offsetof(struct ieee80211_tx_info, driver_rates)); 465 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8); 466 /* clear the rate counts */ 467 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) 468 info->status.rates[i].count = 0; 469 470 BUILD_BUG_ON( 471 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23); 472 memset(&info->status.ampdu_ack_len, 0, 473 sizeof(struct ieee80211_tx_info) - 474 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len)); 475} 476 477 478/** 479 * enum mac80211_rx_flags - receive flags 480 * 481 * These flags are used with the @flag member of &struct ieee80211_rx_status. 482 * @RX_FLAG_MMIC_ERROR: Michael MIC error was reported on this frame. 483 * Use together with %RX_FLAG_MMIC_STRIPPED. 484 * @RX_FLAG_DECRYPTED: This frame was decrypted in hardware. 485 * @RX_FLAG_RADIOTAP: This frame starts with a radiotap header. 486 * @RX_FLAG_MMIC_STRIPPED: the Michael MIC is stripped off this frame, 487 * verification has been done by the hardware. 488 * @RX_FLAG_IV_STRIPPED: The IV/ICV are stripped from this frame. 489 * If this flag is set, the stack cannot do any replay detection 490 * hence the driver or hardware will have to do that. 491 * @RX_FLAG_FAILED_FCS_CRC: Set this flag if the FCS check failed on 492 * the frame. 493 * @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on 494 * the frame. 495 * @RX_FLAG_TSFT: The timestamp passed in the RX status (@mactime field) 496 * is valid. This is useful in monitor mode and necessary for beacon frames 497 * to enable IBSS merging. 498 * @RX_FLAG_SHORTPRE: Short preamble was used for this frame 499 * @RX_FLAG_HT: HT MCS was used and rate_idx is MCS index 500 * @RX_FLAG_40MHZ: HT40 (40 MHz) was used 501 * @RX_FLAG_SHORT_GI: Short guard interval was used 502 */ 503enum mac80211_rx_flags { 504 RX_FLAG_MMIC_ERROR = 1<<0, 505 RX_FLAG_DECRYPTED = 1<<1, 506 RX_FLAG_RADIOTAP = 1<<2, 507 RX_FLAG_MMIC_STRIPPED = 1<<3, 508 RX_FLAG_IV_STRIPPED = 1<<4, 509 RX_FLAG_FAILED_FCS_CRC = 1<<5, 510 RX_FLAG_FAILED_PLCP_CRC = 1<<6, 511 RX_FLAG_TSFT = 1<<7, 512 RX_FLAG_SHORTPRE = 1<<8, 513 RX_FLAG_HT = 1<<9, 514 RX_FLAG_40MHZ = 1<<10, 515 RX_FLAG_SHORT_GI = 1<<11, 516}; 517 518/** 519 * struct ieee80211_rx_status - receive status 520 * 521 * The low-level driver should provide this information (the subset 522 * supported by hardware) to the 802.11 code with each received 523 * frame, in the skb's control buffer (cb). 524 * 525 * @mactime: value in microseconds of the 64-bit Time Synchronization Function 526 * (TSF) timer when the first data symbol (MPDU) arrived at the hardware. 527 * @band: the active band when this frame was received 528 * @freq: frequency the radio was tuned to when receiving this frame, in MHz 529 * @signal: signal strength when receiving this frame, either in dBm, in dB or 530 * unspecified depending on the hardware capabilities flags 531 * @IEEE80211_HW_SIGNAL_* 532 * @noise: noise when receiving this frame, in dBm. 533 * @qual: overall signal quality indication, in percent (0-100). 534 * @antenna: antenna used 535 * @rate_idx: index of data rate into band's supported rates or MCS index if 536 * HT rates are use (RX_FLAG_HT) 537 * @flag: %RX_FLAG_* 538 */ 539struct ieee80211_rx_status { 540 u64 mactime; 541 enum ieee80211_band band; 542 int freq; 543 int signal; 544 int noise; 545 int qual; 546 int antenna; 547 int rate_idx; 548 int flag; 549}; 550 551/** 552 * enum ieee80211_conf_flags - configuration flags 553 * 554 * Flags to define PHY configuration options 555 * 556 * @IEEE80211_CONF_RADIOTAP: add radiotap header at receive time (if supported) 557 * @IEEE80211_CONF_PS: Enable 802.11 power save mode (managed mode only) 558 * @IEEE80211_CONF_IDLE: The device is running, but idle; if the flag is set 559 * the driver should be prepared to handle configuration requests but 560 * may turn the device off as much as possible. Typically, this flag will 561 * be set when an interface is set UP but not associated or scanning, but 562 * it can also be unset in that case when monitor interfaces are active. 563 */ 564enum ieee80211_conf_flags { 565 IEEE80211_CONF_RADIOTAP = (1<<0), 566 IEEE80211_CONF_PS = (1<<1), 567 IEEE80211_CONF_IDLE = (1<<2), 568}; 569 570 571/** 572 * enum ieee80211_conf_changed - denotes which configuration changed 573 * 574 * @_IEEE80211_CONF_CHANGE_RADIO_ENABLED: DEPRECATED 575 * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed 576 * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed 577 * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed 578 * @IEEE80211_CONF_CHANGE_POWER: the TX power changed 579 * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed 580 * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed 581 * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed 582 */ 583enum ieee80211_conf_changed { 584 _IEEE80211_CONF_CHANGE_RADIO_ENABLED = BIT(0), 585 IEEE80211_CONF_CHANGE_LISTEN_INTERVAL = BIT(2), 586 IEEE80211_CONF_CHANGE_RADIOTAP = BIT(3), 587 IEEE80211_CONF_CHANGE_PS = BIT(4), 588 IEEE80211_CONF_CHANGE_POWER = BIT(5), 589 IEEE80211_CONF_CHANGE_CHANNEL = BIT(6), 590 IEEE80211_CONF_CHANGE_RETRY_LIMITS = BIT(7), 591 IEEE80211_CONF_CHANGE_IDLE = BIT(8), 592}; 593 594static inline __deprecated enum ieee80211_conf_changed 595__IEEE80211_CONF_CHANGE_RADIO_ENABLED(void) 596{ 597 return _IEEE80211_CONF_CHANGE_RADIO_ENABLED; 598} 599#define IEEE80211_CONF_CHANGE_RADIO_ENABLED \ 600 __IEEE80211_CONF_CHANGE_RADIO_ENABLED() 601 602/** 603 * struct ieee80211_conf - configuration of the device 604 * 605 * This struct indicates how the driver shall configure the hardware. 606 * 607 * @flags: configuration flags defined above 608 * 609 * @radio_enabled: when zero, driver is required to switch off the radio. 610 * @beacon_int: DEPRECATED, DO NOT USE 611 * 612 * @listen_interval: listen interval in units of beacon interval 613 * @max_sleep_period: the maximum number of beacon intervals to sleep for 614 * before checking the beacon for a TIM bit (managed mode only); this 615 * value will be only achievable between DTIM frames, the hardware 616 * needs to check for the multicast traffic bit in DTIM beacons. 617 * This variable is valid only when the CONF_PS flag is set. 618 * @dynamic_ps_timeout: The dynamic powersave timeout (in ms), see the 619 * powersave documentation below. This variable is valid only when 620 * the CONF_PS flag is set. 621 * 622 * @power_level: requested transmit power (in dBm) 623 * 624 * @channel: the channel to tune to 625 * @channel_type: the channel (HT) type 626 * 627 * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame 628 * (a frame not RTS protected), called "dot11LongRetryLimit" in 802.11, 629 * but actually means the number of transmissions not the number of retries 630 * @short_frame_max_tx_count: Maximum number of transmissions for a "short" 631 * frame, called "dot11ShortRetryLimit" in 802.11, but actually means the 632 * number of transmissions not the number of retries 633 */ 634struct ieee80211_conf { 635 int __deprecated beacon_int; 636 u32 flags; 637 int power_level, dynamic_ps_timeout; 638 int max_sleep_period; 639 640 u16 listen_interval; 641 bool __deprecated radio_enabled; 642 643 u8 long_frame_max_tx_count, short_frame_max_tx_count; 644 645 struct ieee80211_channel *channel; 646 enum nl80211_channel_type channel_type; 647}; 648 649/** 650 * struct ieee80211_vif - per-interface data 651 * 652 * Data in this structure is continually present for driver 653 * use during the life of a virtual interface. 654 * 655 * @type: type of this virtual interface 656 * @bss_conf: BSS configuration for this interface, either our own 657 * or the BSS we're associated to 658 * @drv_priv: data area for driver use, will always be aligned to 659 * sizeof(void *). 660 */ 661struct ieee80211_vif { 662 enum nl80211_iftype type; 663 struct ieee80211_bss_conf bss_conf; 664 /* must be last */ 665 u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *)))); 666}; 667 668static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif) 669{ 670#ifdef CONFIG_MAC80211_MESH 671 return vif->type == NL80211_IFTYPE_MESH_POINT; 672#endif 673 return false; 674} 675 676/** 677 * struct ieee80211_if_init_conf - initial configuration of an interface 678 * 679 * @vif: pointer to a driver-use per-interface structure. The pointer 680 * itself is also used for various functions including 681 * ieee80211_beacon_get() and ieee80211_get_buffered_bc(). 682 * @type: one of &enum nl80211_iftype constants. Determines the type of 683 * added/removed interface. 684 * @mac_addr: pointer to MAC address of the interface. This pointer is valid 685 * until the interface is removed (i.e. it cannot be used after 686 * remove_interface() callback was called for this interface). 687 * 688 * This structure is used in add_interface() and remove_interface() 689 * callbacks of &struct ieee80211_hw. 690 * 691 * When you allow multiple interfaces to be added to your PHY, take care 692 * that the hardware can actually handle multiple MAC addresses. However, 693 * also take care that when there's no interface left with mac_addr != %NULL 694 * you remove the MAC address from the device to avoid acknowledging packets 695 * in pure monitor mode. 696 */ 697struct ieee80211_if_init_conf { 698 enum nl80211_iftype type; 699 struct ieee80211_vif *vif; 700 void *mac_addr; 701}; 702 703/** 704 * enum ieee80211_key_alg - key algorithm 705 * @ALG_WEP: WEP40 or WEP104 706 * @ALG_TKIP: TKIP 707 * @ALG_CCMP: CCMP (AES) 708 * @ALG_AES_CMAC: AES-128-CMAC 709 */ 710enum ieee80211_key_alg { 711 ALG_WEP, 712 ALG_TKIP, 713 ALG_CCMP, 714 ALG_AES_CMAC, 715}; 716 717/** 718 * enum ieee80211_key_flags - key flags 719 * 720 * These flags are used for communication about keys between the driver 721 * and mac80211, with the @flags parameter of &struct ieee80211_key_conf. 722 * 723 * @IEEE80211_KEY_FLAG_WMM_STA: Set by mac80211, this flag indicates 724 * that the STA this key will be used with could be using QoS. 725 * @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the 726 * driver to indicate that it requires IV generation for this 727 * particular key. 728 * @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by 729 * the driver for a TKIP key if it requires Michael MIC 730 * generation in software. 731 * @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates 732 * that the key is pairwise rather then a shared key. 733 * @IEEE80211_KEY_FLAG_SW_MGMT: This flag should be set by the driver for a 734 * CCMP key if it requires CCMP encryption of management frames (MFP) to 735 * be done in software. 736 */ 737enum ieee80211_key_flags { 738 IEEE80211_KEY_FLAG_WMM_STA = 1<<0, 739 IEEE80211_KEY_FLAG_GENERATE_IV = 1<<1, 740 IEEE80211_KEY_FLAG_GENERATE_MMIC= 1<<2, 741 IEEE80211_KEY_FLAG_PAIRWISE = 1<<3, 742 IEEE80211_KEY_FLAG_SW_MGMT = 1<<4, 743}; 744 745/** 746 * struct ieee80211_key_conf - key information 747 * 748 * This key information is given by mac80211 to the driver by 749 * the set_key() callback in &struct ieee80211_ops. 750 * 751 * @hw_key_idx: To be set by the driver, this is the key index the driver 752 * wants to be given when a frame is transmitted and needs to be 753 * encrypted in hardware. 754 * @alg: The key algorithm. 755 * @flags: key flags, see &enum ieee80211_key_flags. 756 * @keyidx: the key index (0-3) 757 * @keylen: key material length 758 * @key: key material. For ALG_TKIP the key is encoded as a 256-bit (32 byte) 759 * data block: 760 * - Temporal Encryption Key (128 bits) 761 * - Temporal Authenticator Tx MIC Key (64 bits) 762 * - Temporal Authenticator Rx MIC Key (64 bits) 763 * @icv_len: The ICV length for this key type 764 * @iv_len: The IV length for this key type 765 */ 766struct ieee80211_key_conf { 767 enum ieee80211_key_alg alg; 768 u8 icv_len; 769 u8 iv_len; 770 u8 hw_key_idx; 771 u8 flags; 772 s8 keyidx; 773 u8 keylen; 774 u8 key[0]; 775}; 776 777/** 778 * enum set_key_cmd - key command 779 * 780 * Used with the set_key() callback in &struct ieee80211_ops, this 781 * indicates whether a key is being removed or added. 782 * 783 * @SET_KEY: a key is set 784 * @DISABLE_KEY: a key must be disabled 785 */ 786enum set_key_cmd { 787 SET_KEY, DISABLE_KEY, 788}; 789 790/** 791 * struct ieee80211_sta - station table entry 792 * 793 * A station table entry represents a station we are possibly 794 * communicating with. Since stations are RCU-managed in 795 * mac80211, any ieee80211_sta pointer you get access to must 796 * either be protected by rcu_read_lock() explicitly or implicitly, 797 * or you must take good care to not use such a pointer after a 798 * call to your sta_notify callback that removed it. 799 * 800 * @addr: MAC address 801 * @aid: AID we assigned to the station if we're an AP 802 * @supp_rates: Bitmap of supported rates (per band) 803 * @ht_cap: HT capabilities of this STA; restricted to our own TX capabilities 804 * @drv_priv: data area for driver use, will always be aligned to 805 * sizeof(void *), size is determined in hw information. 806 */ 807struct ieee80211_sta { 808 u32 supp_rates[IEEE80211_NUM_BANDS]; 809 u8 addr[ETH_ALEN]; 810 u16 aid; 811 struct ieee80211_sta_ht_cap ht_cap; 812 813 /* must be last */ 814 u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *)))); 815}; 816 817/** 818 * enum sta_notify_cmd - sta notify command 819 * 820 * Used with the sta_notify() callback in &struct ieee80211_ops, this 821 * indicates addition and removal of a station to station table, 822 * or if a associated station made a power state transition. 823 * 824 * @STA_NOTIFY_ADD: a station was added to the station table 825 * @STA_NOTIFY_REMOVE: a station being removed from the station table 826 * @STA_NOTIFY_SLEEP: a station is now sleeping 827 * @STA_NOTIFY_AWAKE: a sleeping station woke up 828 */ 829enum sta_notify_cmd { 830 STA_NOTIFY_ADD, STA_NOTIFY_REMOVE, 831 STA_NOTIFY_SLEEP, STA_NOTIFY_AWAKE, 832}; 833 834/** 835 * enum ieee80211_tkip_key_type - get tkip key 836 * 837 * Used by drivers which need to get a tkip key for skb. Some drivers need a 838 * phase 1 key, others need a phase 2 key. A single function allows the driver 839 * to get the key, this enum indicates what type of key is required. 840 * 841 * @IEEE80211_TKIP_P1_KEY: the driver needs a phase 1 key 842 * @IEEE80211_TKIP_P2_KEY: the driver needs a phase 2 key 843 */ 844enum ieee80211_tkip_key_type { 845 IEEE80211_TKIP_P1_KEY, 846 IEEE80211_TKIP_P2_KEY, 847}; 848 849/** 850 * enum ieee80211_hw_flags - hardware flags 851 * 852 * These flags are used to indicate hardware capabilities to 853 * the stack. Generally, flags here should have their meaning 854 * done in a way that the simplest hardware doesn't need setting 855 * any particular flags. There are some exceptions to this rule, 856 * however, so you are advised to review these flags carefully. 857 * 858 * @IEEE80211_HW_RX_INCLUDES_FCS: 859 * Indicates that received frames passed to the stack include 860 * the FCS at the end. 861 * 862 * @IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING: 863 * Some wireless LAN chipsets buffer broadcast/multicast frames 864 * for power saving stations in the hardware/firmware and others 865 * rely on the host system for such buffering. This option is used 866 * to configure the IEEE 802.11 upper layer to buffer broadcast and 867 * multicast frames when there are power saving stations so that 868 * the driver can fetch them with ieee80211_get_buffered_bc(). 869 * 870 * @IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE: 871 * Hardware is not capable of short slot operation on the 2.4 GHz band. 872 * 873 * @IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE: 874 * Hardware is not capable of receiving frames with short preamble on 875 * the 2.4 GHz band. 876 * 877 * @IEEE80211_HW_SIGNAL_UNSPEC: 878 * Hardware can provide signal values but we don't know its units. We 879 * expect values between 0 and @max_signal. 880 * If possible please provide dB or dBm instead. 881 * 882 * @IEEE80211_HW_SIGNAL_DBM: 883 * Hardware gives signal values in dBm, decibel difference from 884 * one milliwatt. This is the preferred method since it is standardized 885 * between different devices. @max_signal does not need to be set. 886 * 887 * @IEEE80211_HW_NOISE_DBM: 888 * Hardware can provide noise (radio interference) values in units dBm, 889 * decibel difference from one milliwatt. 890 * 891 * @IEEE80211_HW_SPECTRUM_MGMT: 892 * Hardware supports spectrum management defined in 802.11h 893 * Measurement, Channel Switch, Quieting, TPC 894 * 895 * @IEEE80211_HW_AMPDU_AGGREGATION: 896 * Hardware supports 11n A-MPDU aggregation. 897 * 898 * @IEEE80211_HW_SUPPORTS_PS: 899 * Hardware has power save support (i.e. can go to sleep). 900 * 901 * @IEEE80211_HW_PS_NULLFUNC_STACK: 902 * Hardware requires nullfunc frame handling in stack, implies 903 * stack support for dynamic PS. 904 * 905 * @IEEE80211_HW_SUPPORTS_DYNAMIC_PS: 906 * Hardware has support for dynamic PS. 907 * 908 * @IEEE80211_HW_MFP_CAPABLE: 909 * Hardware supports management frame protection (MFP, IEEE 802.11w). 910 * 911 * @IEEE80211_HW_BEACON_FILTER: 912 * Hardware supports dropping of irrelevant beacon frames to 913 * avoid waking up cpu. 914 */ 915enum ieee80211_hw_flags { 916 IEEE80211_HW_RX_INCLUDES_FCS = 1<<1, 917 IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING = 1<<2, 918 IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE = 1<<3, 919 IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE = 1<<4, 920 IEEE80211_HW_SIGNAL_UNSPEC = 1<<5, 921 IEEE80211_HW_SIGNAL_DBM = 1<<6, 922 IEEE80211_HW_NOISE_DBM = 1<<7, 923 IEEE80211_HW_SPECTRUM_MGMT = 1<<8, 924 IEEE80211_HW_AMPDU_AGGREGATION = 1<<9, 925 IEEE80211_HW_SUPPORTS_PS = 1<<10, 926 IEEE80211_HW_PS_NULLFUNC_STACK = 1<<11, 927 IEEE80211_HW_SUPPORTS_DYNAMIC_PS = 1<<12, 928 IEEE80211_HW_MFP_CAPABLE = 1<<13, 929 IEEE80211_HW_BEACON_FILTER = 1<<14, 930}; 931 932/** 933 * struct ieee80211_hw - hardware information and state 934 * 935 * This structure contains the configuration and hardware 936 * information for an 802.11 PHY. 937 * 938 * @wiphy: This points to the &struct wiphy allocated for this 939 * 802.11 PHY. You must fill in the @perm_addr and @dev 940 * members of this structure using SET_IEEE80211_DEV() 941 * and SET_IEEE80211_PERM_ADDR(). Additionally, all supported 942 * bands (with channels, bitrates) are registered here. 943 * 944 * @conf: &struct ieee80211_conf, device configuration, don't use. 945 * 946 * @priv: pointer to private area that was allocated for driver use 947 * along with this structure. 948 * 949 * @flags: hardware flags, see &enum ieee80211_hw_flags. 950 * 951 * @extra_tx_headroom: headroom to reserve in each transmit skb 952 * for use by the driver (e.g. for transmit headers.) 953 * 954 * @channel_change_time: time (in microseconds) it takes to change channels. 955 * 956 * @max_signal: Maximum value for signal (rssi) in RX information, used 957 * only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB 958 * 959 * @max_listen_interval: max listen interval in units of beacon interval 960 * that HW supports 961 * 962 * @queues: number of available hardware transmit queues for 963 * data packets. WMM/QoS requires at least four, these 964 * queues need to have configurable access parameters. 965 * 966 * @rate_control_algorithm: rate control algorithm for this hardware. 967 * If unset (NULL), the default algorithm will be used. Must be 968 * set before calling ieee80211_register_hw(). 969 * 970 * @vif_data_size: size (in bytes) of the drv_priv data area 971 * within &struct ieee80211_vif. 972 * @sta_data_size: size (in bytes) of the drv_priv data area 973 * within &struct ieee80211_sta. 974 * 975 * @max_rates: maximum number of alternate rate retry stages 976 * @max_rate_tries: maximum number of tries for each stage 977 */ 978struct ieee80211_hw { 979 struct ieee80211_conf conf; 980 struct wiphy *wiphy; 981 const char *rate_control_algorithm; 982 void *priv; 983 u32 flags; 984 unsigned int extra_tx_headroom; 985 int channel_change_time; 986 int vif_data_size; 987 int sta_data_size; 988 u16 queues; 989 u16 max_listen_interval; 990 s8 max_signal; 991 u8 max_rates; 992 u8 max_rate_tries; 993}; 994 995/** 996 * wiphy_to_ieee80211_hw - return a mac80211 driver hw struct from a wiphy 997 * 998 * @wiphy: the &struct wiphy which we want to query 999 * 1000 * mac80211 drivers can use this to get to their respective 1001 * &struct ieee80211_hw. Drivers wishing to get to their own private 1002 * structure can then access it via hw->priv. Note that mac802111 drivers should 1003 * not use wiphy_priv() to try to get their private driver structure as this 1004 * is already used internally by mac80211. 1005 */ 1006struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy); 1007 1008/** 1009 * SET_IEEE80211_DEV - set device for 802.11 hardware 1010 * 1011 * @hw: the &struct ieee80211_hw to set the device for 1012 * @dev: the &struct device of this 802.11 device 1013 */ 1014static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev) 1015{ 1016 set_wiphy_dev(hw->wiphy, dev); 1017} 1018 1019/** 1020 * SET_IEEE80211_PERM_ADDR - set the permanent MAC address for 802.11 hardware 1021 * 1022 * @hw: the &struct ieee80211_hw to set the MAC address for 1023 * @addr: the address to set 1024 */ 1025static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr) 1026{ 1027 memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN); 1028} 1029 1030static inline struct ieee80211_rate * 1031ieee80211_get_tx_rate(const struct ieee80211_hw *hw, 1032 const struct ieee80211_tx_info *c) 1033{ 1034 if (WARN_ON(c->control.rates[0].idx < 0)) 1035 return NULL; 1036 return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx]; 1037} 1038 1039static inline struct ieee80211_rate * 1040ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw, 1041 const struct ieee80211_tx_info *c) 1042{ 1043 if (c->control.rts_cts_rate_idx < 0) 1044 return NULL; 1045 return &hw->wiphy->bands[c->band]->bitrates[c->control.rts_cts_rate_idx]; 1046} 1047 1048static inline struct ieee80211_rate * 1049ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw, 1050 const struct ieee80211_tx_info *c, int idx) 1051{ 1052 if (c->control.rates[idx + 1].idx < 0) 1053 return NULL; 1054 return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx]; 1055} 1056 1057/** 1058 * DOC: Hardware crypto acceleration 1059 * 1060 * mac80211 is capable of taking advantage of many hardware 1061 * acceleration designs for encryption and decryption operations. 1062 * 1063 * The set_key() callback in the &struct ieee80211_ops for a given 1064 * device is called to enable hardware acceleration of encryption and 1065 * decryption. The callback takes a @sta parameter that will be NULL 1066 * for default keys or keys used for transmission only, or point to 1067 * the station information for the peer for individual keys. 1068 * Multiple transmission keys with the same key index may be used when 1069 * VLANs are configured for an access point. 1070 * 1071 * When transmitting, the TX control data will use the @hw_key_idx 1072 * selected by the driver by modifying the &struct ieee80211_key_conf 1073 * pointed to by the @key parameter to the set_key() function. 1074 * 1075 * The set_key() call for the %SET_KEY command should return 0 if 1076 * the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be 1077 * added; if you return 0 then hw_key_idx must be assigned to the 1078 * hardware key index, you are free to use the full u8 range. 1079 * 1080 * When the cmd is %DISABLE_KEY then it must succeed. 1081 * 1082 * Note that it is permissible to not decrypt a frame even if a key 1083 * for it has been uploaded to hardware, the stack will not make any 1084 * decision based on whether a key has been uploaded or not but rather 1085 * based on the receive flags. 1086 * 1087 * The &struct ieee80211_key_conf structure pointed to by the @key 1088 * parameter is guaranteed to be valid until another call to set_key() 1089 * removes it, but it can only be used as a cookie to differentiate 1090 * keys. 1091 * 1092 * In TKIP some HW need to be provided a phase 1 key, for RX decryption 1093 * acceleration (i.e. iwlwifi). Those drivers should provide update_tkip_key 1094 * handler. 1095 * The update_tkip_key() call updates the driver with the new phase 1 key. 1096 * This happens everytime the iv16 wraps around (every 65536 packets). The 1097 * set_key() call will happen only once for each key (unless the AP did 1098 * rekeying), it will not include a valid phase 1 key. The valid phase 1 key is 1099 * provided by update_tkip_key only. The trigger that makes mac80211 call this 1100 * handler is software decryption with wrap around of iv16. 1101 */ 1102 1103/** 1104 * DOC: Powersave support 1105 * 1106 * mac80211 has support for various powersave implementations. 1107 * 1108 * First, it can support hardware that handles all powersaving by 1109 * itself, such hardware should simply set the %IEEE80211_HW_SUPPORTS_PS 1110 * hardware flag. In that case, it will be told about the desired 1111 * powersave mode depending on the association status, and the driver 1112 * must take care of sending nullfunc frames when necessary, i.e. when 1113 * entering and leaving powersave mode. The driver is required to look at 1114 * the AID in beacons and signal to the AP that it woke up when it finds 1115 * traffic directed to it. This mode supports dynamic PS by simply 1116 * enabling/disabling PS. 1117 * 1118 * Additionally, such hardware may set the %IEEE80211_HW_SUPPORTS_DYNAMIC_PS 1119 * flag to indicate that it can support dynamic PS mode itself (see below). 1120 * 1121 * Other hardware designs cannot send nullfunc frames by themselves and also 1122 * need software support for parsing the TIM bitmap. This is also supported 1123 * by mac80211 by combining the %IEEE80211_HW_SUPPORTS_PS and 1124 * %IEEE80211_HW_PS_NULLFUNC_STACK flags. The hardware is of course still 1125 * required to pass up beacons. The hardware is still required to handle 1126 * waking up for multicast traffic; if it cannot the driver must handle that 1127 * as best as it can, mac80211 is too slow. 1128 * 1129 * Dynamic powersave mode is an extension to normal powersave mode in which 1130 * the hardware stays awake for a user-specified period of time after sending 1131 * a frame so that reply frames need not be buffered and therefore delayed 1132 * to the next wakeup. This can either be supported by hardware, in which case 1133 * the driver needs to look at the @dynamic_ps_timeout hardware configuration 1134 * value, or by the stack if all nullfunc handling is in the stack. 1135 */ 1136 1137/** 1138 * DOC: Beacon filter support 1139 * 1140 * Some hardware have beacon filter support to reduce host cpu wakeups 1141 * which will reduce system power consumption. It usuallly works so that 1142 * the firmware creates a checksum of the beacon but omits all constantly 1143 * changing elements (TSF, TIM etc). Whenever the checksum changes the 1144 * beacon is forwarded to the host, otherwise it will be just dropped. That 1145 * way the host will only receive beacons where some relevant information 1146 * (for example ERP protection or WMM settings) have changed. 1147 * 1148 * Beacon filter support is advertised with the %IEEE80211_HW_BEACON_FILTER 1149 * hardware capability. The driver needs to enable beacon filter support 1150 * whenever power save is enabled, that is %IEEE80211_CONF_PS is set. When 1151 * power save is enabled, the stack will not check for beacon loss and the 1152 * driver needs to notify about loss of beacons with ieee80211_beacon_loss(). 1153 * 1154 * The time (or number of beacons missed) until the firmware notifies the 1155 * driver of a beacon loss event (which in turn causes the driver to call 1156 * ieee80211_beacon_loss()) should be configurable and will be controlled 1157 * by mac80211 and the roaming algorithm in the future. 1158 * 1159 * Since there may be constantly changing information elements that nothing 1160 * in the software stack cares about, we will, in the future, have mac80211 1161 * tell the driver which information elements are interesting in the sense 1162 * that we want to see changes in them. This will include 1163 * - a list of information element IDs 1164 * - a list of OUIs for the vendor information element 1165 * 1166 * Ideally, the hardware would filter out any beacons without changes in the 1167 * requested elements, but if it cannot support that it may, at the expense 1168 * of some efficiency, filter out only a subset. For example, if the device 1169 * doesn't support checking for OUIs it should pass up all changes in all 1170 * vendor information elements. 1171 * 1172 * Note that change, for the sake of simplification, also includes information 1173 * elements appearing or disappearing from the beacon. 1174 * 1175 * Some hardware supports an "ignore list" instead, just make sure nothing 1176 * that was requested is on the ignore list, and include commonly changing 1177 * information element IDs in the ignore list, for example 11 (BSS load) and 1178 * the various vendor-assigned IEs with unknown contents (128, 129, 133-136, 1179 * 149, 150, 155, 156, 173, 176, 178, 179, 219); for forward compatibility 1180 * it could also include some currently unused IDs. 1181 * 1182 * 1183 * In addition to these capabilities, hardware should support notifying the 1184 * host of changes in the beacon RSSI. This is relevant to implement roaming 1185 * when no traffic is flowing (when traffic is flowing we see the RSSI of 1186 * the received data packets). This can consist in notifying the host when 1187 * the RSSI changes significantly or when it drops below or rises above 1188 * configurable thresholds. In the future these thresholds will also be 1189 * configured by mac80211 (which gets them from userspace) to implement 1190 * them as the roaming algorithm requires. 1191 * 1192 * If the hardware cannot implement this, the driver should ask it to 1193 * periodically pass beacon frames to the host so that software can do the 1194 * signal strength threshold checking. 1195 */ 1196 1197/** 1198 * DOC: Frame filtering 1199 * 1200 * mac80211 requires to see many management frames for proper 1201 * operation, and users may want to see many more frames when 1202 * in monitor mode. However, for best CPU usage and power consumption, 1203 * having as few frames as possible percolate through the stack is 1204 * desirable. Hence, the hardware should filter as much as possible. 1205 * 1206 * To achieve this, mac80211 uses filter flags (see below) to tell 1207 * the driver's configure_filter() function which frames should be 1208 * passed to mac80211 and which should be filtered out. 1209 * 1210 * The configure_filter() callback is invoked with the parameters 1211 * @mc_count and @mc_list for the combined multicast address list 1212 * of all virtual interfaces, @changed_flags telling which flags 1213 * were changed and @total_flags with the new flag states. 1214 * 1215 * If your device has no multicast address filters your driver will 1216 * need to check both the %FIF_ALLMULTI flag and the @mc_count 1217 * parameter to see whether multicast frames should be accepted 1218 * or dropped. 1219 * 1220 * All unsupported flags in @total_flags must be cleared. 1221 * Hardware does not support a flag if it is incapable of _passing_ 1222 * the frame to the stack. Otherwise the driver must ignore 1223 * the flag, but not clear it. 1224 * You must _only_ clear the flag (announce no support for the 1225 * flag to mac80211) if you are not able to pass the packet type 1226 * to the stack (so the hardware always filters it). 1227 * So for example, you should clear @FIF_CONTROL, if your hardware 1228 * always filters control frames. If your hardware always passes 1229 * control frames to the kernel and is incapable of filtering them, 1230 * you do _not_ clear the @FIF_CONTROL flag. 1231 * This rule applies to all other FIF flags as well. 1232 */ 1233 1234/** 1235 * enum ieee80211_filter_flags - hardware filter flags 1236 * 1237 * These flags determine what the filter in hardware should be 1238 * programmed to let through and what should not be passed to the 1239 * stack. It is always safe to pass more frames than requested, 1240 * but this has negative impact on power consumption. 1241 * 1242 * @FIF_PROMISC_IN_BSS: promiscuous mode within your BSS, 1243 * think of the BSS as your network segment and then this corresponds 1244 * to the regular ethernet device promiscuous mode. 1245 * 1246 * @FIF_ALLMULTI: pass all multicast frames, this is used if requested 1247 * by the user or if the hardware is not capable of filtering by 1248 * multicast address. 1249 * 1250 * @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the 1251 * %RX_FLAG_FAILED_FCS_CRC for them) 1252 * 1253 * @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set 1254 * the %RX_FLAG_FAILED_PLCP_CRC for them 1255 * 1256 * @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate 1257 * to the hardware that it should not filter beacons or probe responses 1258 * by BSSID. Filtering them can greatly reduce the amount of processing 1259 * mac80211 needs to do and the amount of CPU wakeups, so you should 1260 * honour this flag if possible. 1261 * 1262 * @FIF_CONTROL: pass control frames (except for PS Poll), if PROMISC_IN_BSS 1263 * is not set then only those addressed to this station. 1264 * 1265 * @FIF_OTHER_BSS: pass frames destined to other BSSes 1266 * 1267 * @FIF_PSPOLL: pass PS Poll frames, if PROMISC_IN_BSS is not set then only 1268 * those addressed to this station. 1269 */ 1270enum ieee80211_filter_flags { 1271 FIF_PROMISC_IN_BSS = 1<<0, 1272 FIF_ALLMULTI = 1<<1, 1273 FIF_FCSFAIL = 1<<2, 1274 FIF_PLCPFAIL = 1<<3, 1275 FIF_BCN_PRBRESP_PROMISC = 1<<4, 1276 FIF_CONTROL = 1<<5, 1277 FIF_OTHER_BSS = 1<<6, 1278 FIF_PSPOLL = 1<<7, 1279}; 1280 1281/** 1282 * enum ieee80211_ampdu_mlme_action - A-MPDU actions 1283 * 1284 * These flags are used with the ampdu_action() callback in 1285 * &struct ieee80211_ops to indicate which action is needed. 1286 * @IEEE80211_AMPDU_RX_START: start Rx aggregation 1287 * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation 1288 * @IEEE80211_AMPDU_TX_START: start Tx aggregation 1289 * @IEEE80211_AMPDU_TX_STOP: stop Tx aggregation 1290 * @IEEE80211_AMPDU_TX_OPERATIONAL: TX aggregation has become operational 1291 */ 1292enum ieee80211_ampdu_mlme_action { 1293 IEEE80211_AMPDU_RX_START, 1294 IEEE80211_AMPDU_RX_STOP, 1295 IEEE80211_AMPDU_TX_START, 1296 IEEE80211_AMPDU_TX_STOP, 1297 IEEE80211_AMPDU_TX_OPERATIONAL, 1298}; 1299 1300/** 1301 * struct ieee80211_ops - callbacks from mac80211 to the driver 1302 * 1303 * This structure contains various callbacks that the driver may 1304 * handle or, in some cases, must handle, for example to configure 1305 * the hardware to a new channel or to transmit a frame. 1306 * 1307 * @tx: Handler that 802.11 module calls for each transmitted frame. 1308 * skb contains the buffer starting from the IEEE 802.11 header. 1309 * The low-level driver should send the frame out based on 1310 * configuration in the TX control data. This handler should, 1311 * preferably, never fail and stop queues appropriately, more 1312 * importantly, however, it must never fail for A-MPDU-queues. 1313 * This function should return NETDEV_TX_OK except in very 1314 * limited cases. 1315 * Must be implemented and atomic. 1316 * 1317 * @start: Called before the first netdevice attached to the hardware 1318 * is enabled. This should turn on the hardware and must turn on 1319 * frame reception (for possibly enabled monitor interfaces.) 1320 * Returns negative error codes, these may be seen in userspace, 1321 * or zero. 1322 * When the device is started it should not have a MAC address 1323 * to avoid acknowledging frames before a non-monitor device 1324 * is added. 1325 * Must be implemented. 1326 * 1327 * @stop: Called after last netdevice attached to the hardware 1328 * is disabled. This should turn off the hardware (at least 1329 * it must turn off frame reception.) 1330 * May be called right after add_interface if that rejects 1331 * an interface. If you added any work onto the mac80211 workqueue 1332 * you should ensure to cancel it on this callback. 1333 * Must be implemented. 1334 * 1335 * @add_interface: Called when a netdevice attached to the hardware is 1336 * enabled. Because it is not called for monitor mode devices, @start 1337 * and @stop must be implemented. 1338 * The driver should perform any initialization it needs before 1339 * the device can be enabled. The initial configuration for the 1340 * interface is given in the conf parameter. 1341 * The callback may refuse to add an interface by returning a 1342 * negative error code (which will be seen in userspace.) 1343 * Must be implemented. 1344 * 1345 * @remove_interface: Notifies a driver that an interface is going down. 1346 * The @stop callback is called after this if it is the last interface 1347 * and no monitor interfaces are present. 1348 * When all interfaces are removed, the MAC address in the hardware 1349 * must be cleared so the device no longer acknowledges packets, 1350 * the mac_addr member of the conf structure is, however, set to the 1351 * MAC address of the device going away. 1352 * Hence, this callback must be implemented. 1353 * 1354 * @config: Handler for configuration requests. IEEE 802.11 code calls this 1355 * function to change hardware configuration, e.g., channel. 1356 * This function should never fail but returns a negative error code 1357 * if it does. 1358 * 1359 * @bss_info_changed: Handler for configuration requests related to BSS 1360 * parameters that may vary during BSS's lifespan, and may affect low 1361 * level driver (e.g. assoc/disassoc status, erp parameters). 1362 * This function should not be used if no BSS has been set, unless 1363 * for association indication. The @changed parameter indicates which 1364 * of the bss parameters has changed when a call is made. 1365 * 1366 * @configure_filter: Configure the device's RX filter. 1367 * See the section "Frame filtering" for more information. 1368 * This callback must be implemented and atomic. 1369 * 1370 * @set_tim: Set TIM bit. mac80211 calls this function when a TIM bit 1371 * must be set or cleared for a given STA. Must be atomic. 1372 * 1373 * @set_key: See the section "Hardware crypto acceleration" 1374 * This callback can sleep, and is only called between add_interface 1375 * and remove_interface calls, i.e. while the given virtual interface 1376 * is enabled. 1377 * Returns a negative error code if the key can't be added. 1378 * 1379 * @update_tkip_key: See the section "Hardware crypto acceleration" 1380 * This callback will be called in the context of Rx. Called for drivers 1381 * which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY. 1382 * 1383 * @hw_scan: Ask the hardware to service the scan request, no need to start 1384 * the scan state machine in stack. The scan must honour the channel 1385 * configuration done by the regulatory agent in the wiphy's 1386 * registered bands. The hardware (or the driver) needs to make sure 1387 * that power save is disabled. 1388 * The @req ie/ie_len members are rewritten by mac80211 to contain the 1389 * entire IEs after the SSID, so that drivers need not look at these 1390 * at all but just send them after the SSID -- mac80211 includes the 1391 * (extended) supported rates and HT information (where applicable). 1392 * When the scan finishes, ieee80211_scan_completed() must be called; 1393 * note that it also must be called when the scan cannot finish due to 1394 * any error unless this callback returned a negative error code. 1395 * 1396 * @sw_scan_start: Notifier function that is called just before a software scan 1397 * is started. Can be NULL, if the driver doesn't need this notification. 1398 * 1399 * @sw_scan_complete: Notifier function that is called just after a software scan 1400 * finished. Can be NULL, if the driver doesn't need this notification. 1401 * 1402 * @get_stats: Return low-level statistics. 1403 * Returns zero if statistics are available. 1404 * 1405 * @get_tkip_seq: If your device implements TKIP encryption in hardware this 1406 * callback should be provided to read the TKIP transmit IVs (both IV32 1407 * and IV16) for the given key from hardware. 1408 * 1409 * @set_rts_threshold: Configuration of RTS threshold (if device needs it) 1410 * 1411 * @sta_notify: Notifies low level driver about addition, removal or power 1412 * state transition of an associated station, AP, IBSS/WDS/mesh peer etc. 1413 * Must be atomic. 1414 * 1415 * @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max), 1416 * bursting) for a hardware TX queue. 1417 * Returns a negative error code on failure. 1418 * 1419 * @get_tx_stats: Get statistics of the current TX queue status. This is used 1420 * to get number of currently queued packets (queue length), maximum queue 1421 * size (limit), and total number of packets sent using each TX queue 1422 * (count). The 'stats' pointer points to an array that has hw->queues 1423 * items. 1424 * 1425 * @get_tsf: Get the current TSF timer value from firmware/hardware. Currently, 1426 * this is only used for IBSS mode BSSID merging and debugging. Is not a 1427 * required function. 1428 * 1429 * @set_tsf: Set the TSF timer to the specified value in the firmware/hardware. 1430 * Currently, this is only used for IBSS mode debugging. Is not a 1431 * required function. 1432 * 1433 * @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize 1434 * with other STAs in the IBSS. This is only used in IBSS mode. This 1435 * function is optional if the firmware/hardware takes full care of 1436 * TSF synchronization. 1437 * 1438 * @tx_last_beacon: Determine whether the last IBSS beacon was sent by us. 1439 * This is needed only for IBSS mode and the result of this function is 1440 * used to determine whether to reply to Probe Requests. 1441 * Returns non-zero if this device sent the last beacon. 1442 * 1443 * @ampdu_action: Perform a certain A-MPDU action 1444 * The RA/TID combination determines the destination and TID we want 1445 * the ampdu action to be performed for. The action is defined through 1446 * ieee80211_ampdu_mlme_action. Starting sequence number (@ssn) 1447 * is the first frame we expect to perform the action on. Notice 1448 * that TX/RX_STOP can pass NULL for this parameter. 1449 * Returns a negative error code on failure. 1450 * 1451 * @rfkill_poll: Poll rfkill hardware state. If you need this, you also 1452 * need to set wiphy->rfkill_poll to %true before registration, 1453 * and need to call wiphy_rfkill_set_hw_state() in the callback. 1454 * 1455 * @testmode_cmd: Implement a cfg80211 test mode command. 1456 */ 1457struct ieee80211_ops { 1458 int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb); 1459 int (*start)(struct ieee80211_hw *hw); 1460 void (*stop)(struct ieee80211_hw *hw); 1461 int (*add_interface)(struct ieee80211_hw *hw, 1462 struct ieee80211_if_init_conf *conf); 1463 void (*remove_interface)(struct ieee80211_hw *hw, 1464 struct ieee80211_if_init_conf *conf); 1465 int (*config)(struct ieee80211_hw *hw, u32 changed); 1466 void (*bss_info_changed)(struct ieee80211_hw *hw, 1467 struct ieee80211_vif *vif, 1468 struct ieee80211_bss_conf *info, 1469 u32 changed); 1470 void (*configure_filter)(struct ieee80211_hw *hw, 1471 unsigned int changed_flags, 1472 unsigned int *total_flags, 1473 int mc_count, struct dev_addr_list *mc_list); 1474 int (*set_tim)(struct ieee80211_hw *hw, struct ieee80211_sta *sta, 1475 bool set); 1476 int (*set_key)(struct ieee80211_hw *hw, enum set_key_cmd cmd, 1477 struct ieee80211_vif *vif, struct ieee80211_sta *sta, 1478 struct ieee80211_key_conf *key); 1479 void (*update_tkip_key)(struct ieee80211_hw *hw, 1480 struct ieee80211_key_conf *conf, const u8 *address, 1481 u32 iv32, u16 *phase1key); 1482 int (*hw_scan)(struct ieee80211_hw *hw, 1483 struct cfg80211_scan_request *req); 1484 void (*sw_scan_start)(struct ieee80211_hw *hw); 1485 void (*sw_scan_complete)(struct ieee80211_hw *hw); 1486 int (*get_stats)(struct ieee80211_hw *hw, 1487 struct ieee80211_low_level_stats *stats); 1488 void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx, 1489 u32 *iv32, u16 *iv16); 1490 int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value); 1491 void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 1492 enum sta_notify_cmd, struct ieee80211_sta *sta); 1493 int (*conf_tx)(struct ieee80211_hw *hw, u16 queue, 1494 const struct ieee80211_tx_queue_params *params); 1495 int (*get_tx_stats)(struct ieee80211_hw *hw, 1496 struct ieee80211_tx_queue_stats *stats); 1497 u64 (*get_tsf)(struct ieee80211_hw *hw); 1498 void (*set_tsf)(struct ieee80211_hw *hw, u64 tsf); 1499 void (*reset_tsf)(struct ieee80211_hw *hw); 1500 int (*tx_last_beacon)(struct ieee80211_hw *hw); 1501 int (*ampdu_action)(struct ieee80211_hw *hw, 1502 enum ieee80211_ampdu_mlme_action action, 1503 struct ieee80211_sta *sta, u16 tid, u16 *ssn); 1504 1505 void (*rfkill_poll)(struct ieee80211_hw *hw); 1506#ifdef CONFIG_NL80211_TESTMODE 1507 int (*testmode_cmd)(struct ieee80211_hw *hw, void *data, int len); 1508#endif 1509}; 1510 1511/** 1512 * ieee80211_alloc_hw - Allocate a new hardware device 1513 * 1514 * This must be called once for each hardware device. The returned pointer 1515 * must be used to refer to this device when calling other functions. 1516 * mac80211 allocates a private data area for the driver pointed to by 1517 * @priv in &struct ieee80211_hw, the size of this area is given as 1518 * @priv_data_len. 1519 * 1520 * @priv_data_len: length of private data 1521 * @ops: callbacks for this device 1522 */ 1523struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 1524 const struct ieee80211_ops *ops); 1525 1526/** 1527 * ieee80211_register_hw - Register hardware device 1528 * 1529 * You must call this function before any other functions in 1530 * mac80211. Note that before a hardware can be registered, you 1531 * need to fill the contained wiphy's information. 1532 * 1533 * @hw: the device to register as returned by ieee80211_alloc_hw() 1534 */ 1535int ieee80211_register_hw(struct ieee80211_hw *hw); 1536 1537#ifdef CONFIG_MAC80211_LEDS 1538extern char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw); 1539extern char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw); 1540extern char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw); 1541extern char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw); 1542#endif 1543/** 1544 * ieee80211_get_tx_led_name - get name of TX LED 1545 * 1546 * mac80211 creates a transmit LED trigger for each wireless hardware 1547 * that can be used to drive LEDs if your driver registers a LED device. 1548 * This function returns the name (or %NULL if not configured for LEDs) 1549 * of the trigger so you can automatically link the LED device. 1550 * 1551 * @hw: the hardware to get the LED trigger name for 1552 */ 1553static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw) 1554{ 1555#ifdef CONFIG_MAC80211_LEDS 1556 return __ieee80211_get_tx_led_name(hw); 1557#else 1558 return NULL; 1559#endif 1560} 1561 1562/** 1563 * ieee80211_get_rx_led_name - get name of RX LED 1564 * 1565 * mac80211 creates a receive LED trigger for each wireless hardware 1566 * that can be used to drive LEDs if your driver registers a LED device. 1567 * This function returns the name (or %NULL if not configured for LEDs) 1568 * of the trigger so you can automatically link the LED device. 1569 * 1570 * @hw: the hardware to get the LED trigger name for 1571 */ 1572static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw) 1573{ 1574#ifdef CONFIG_MAC80211_LEDS 1575 return __ieee80211_get_rx_led_name(hw); 1576#else 1577 return NULL; 1578#endif 1579} 1580 1581/** 1582 * ieee80211_get_assoc_led_name - get name of association LED 1583 * 1584 * mac80211 creates a association LED trigger for each wireless hardware 1585 * that can be used to drive LEDs if your driver registers a LED device. 1586 * This function returns the name (or %NULL if not configured for LEDs) 1587 * of the trigger so you can automatically link the LED device. 1588 * 1589 * @hw: the hardware to get the LED trigger name for 1590 */ 1591static inline char *ieee80211_get_assoc_led_name(struct ieee80211_hw *hw) 1592{ 1593#ifdef CONFIG_MAC80211_LEDS 1594 return __ieee80211_get_assoc_led_name(hw); 1595#else 1596 return NULL; 1597#endif 1598} 1599 1600/** 1601 * ieee80211_get_radio_led_name - get name of radio LED 1602 * 1603 * mac80211 creates a radio change LED trigger for each wireless hardware 1604 * that can be used to drive LEDs if your driver registers a LED device. 1605 * This function returns the name (or %NULL if not configured for LEDs) 1606 * of the trigger so you can automatically link the LED device. 1607 * 1608 * @hw: the hardware to get the LED trigger name for 1609 */ 1610static inline char *ieee80211_get_radio_led_name(struct ieee80211_hw *hw) 1611{ 1612#ifdef CONFIG_MAC80211_LEDS 1613 return __ieee80211_get_radio_led_name(hw); 1614#else 1615 return NULL; 1616#endif 1617} 1618 1619/** 1620 * ieee80211_unregister_hw - Unregister a hardware device 1621 * 1622 * This function instructs mac80211 to free allocated resources 1623 * and unregister netdevices from the networking subsystem. 1624 * 1625 * @hw: the hardware to unregister 1626 */ 1627void ieee80211_unregister_hw(struct ieee80211_hw *hw); 1628 1629/** 1630 * ieee80211_free_hw - free hardware descriptor 1631 * 1632 * This function frees everything that was allocated, including the 1633 * private data for the driver. You must call ieee80211_unregister_hw() 1634 * before calling this function. 1635 * 1636 * @hw: the hardware to free 1637 */ 1638void ieee80211_free_hw(struct ieee80211_hw *hw); 1639 1640/** 1641 * ieee80211_restart_hw - restart hardware completely 1642 * 1643 * Call this function when the hardware was restarted for some reason 1644 * (hardware error, ...) and the driver is unable to restore its state 1645 * by itself. mac80211 assumes that at this point the driver/hardware 1646 * is completely uninitialised and stopped, it starts the process by 1647 * calling the ->start() operation. The driver will need to reset all 1648 * internal state that it has prior to calling this function. 1649 * 1650 * @hw: the hardware to restart 1651 */ 1652void ieee80211_restart_hw(struct ieee80211_hw *hw); 1653 1654/* 1655 * trick to avoid symbol clashes with the ieee80211 subsystem, 1656 * use the inline below instead 1657 */ 1658void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb); 1659 1660/** 1661 * ieee80211_rx - receive frame 1662 * 1663 * Use this function to hand received frames to mac80211. The receive 1664 * buffer in @skb must start with an IEEE 802.11 header or a radiotap 1665 * header if %RX_FLAG_RADIOTAP is set in the @status flags. 1666 * 1667 * This function may not be called in IRQ context. Calls to this function 1668 * for a single hardware must be synchronized against each other. Calls 1669 * to this function and ieee80211_rx_irqsafe() may not be mixed for a 1670 * single hardware. 1671 * 1672 * @hw: the hardware this frame came in on 1673 * @skb: the buffer to receive, owned by mac80211 after this call 1674 */ 1675static inline void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) 1676{ 1677 __ieee80211_rx(hw, skb); 1678} 1679 1680/** 1681 * ieee80211_rx_irqsafe - receive frame 1682 * 1683 * Like ieee80211_rx() but can be called in IRQ context 1684 * (internally defers to a tasklet.) 1685 * 1686 * Calls to this function and ieee80211_rx() may not be mixed for a 1687 * single hardware. 1688 * 1689 * @hw: the hardware this frame came in on 1690 * @skb: the buffer to receive, owned by mac80211 after this call 1691 */ 1692void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb); 1693 1694/** 1695 * ieee80211_tx_status - transmit status callback 1696 * 1697 * Call this function for all transmitted frames after they have been 1698 * transmitted. It is permissible to not call this function for 1699 * multicast frames but this can affect statistics. 1700 * 1701 * This function may not be called in IRQ context. Calls to this function 1702 * for a single hardware must be synchronized against each other. Calls 1703 * to this function and ieee80211_tx_status_irqsafe() may not be mixed 1704 * for a single hardware. 1705 * 1706 * @hw: the hardware the frame was transmitted by 1707 * @skb: the frame that was transmitted, owned by mac80211 after this call 1708 */ 1709void ieee80211_tx_status(struct ieee80211_hw *hw, 1710 struct sk_buff *skb); 1711 1712/** 1713 * ieee80211_tx_status_irqsafe - IRQ-safe transmit status callback 1714 * 1715 * Like ieee80211_tx_status() but can be called in IRQ context 1716 * (internally defers to a tasklet.) 1717 * 1718 * Calls to this function and ieee80211_tx_status() may not be mixed for a 1719 * single hardware. 1720 * 1721 * @hw: the hardware the frame was transmitted by 1722 * @skb: the frame that was transmitted, owned by mac80211 after this call 1723 */ 1724void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 1725 struct sk_buff *skb); 1726 1727/** 1728 * ieee80211_beacon_get - beacon generation function 1729 * @hw: pointer obtained from ieee80211_alloc_hw(). 1730 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1731 * 1732 * If the beacon frames are generated by the host system (i.e., not in 1733 * hardware/firmware), the low-level driver uses this function to receive 1734 * the next beacon frame from the 802.11 code. The low-level is responsible 1735 * for calling this function before beacon data is needed (e.g., based on 1736 * hardware interrupt). Returned skb is used only once and low-level driver 1737 * is responsible for freeing it. 1738 */ 1739struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, 1740 struct ieee80211_vif *vif); 1741 1742/** 1743 * ieee80211_rts_get - RTS frame generation function 1744 * @hw: pointer obtained from ieee80211_alloc_hw(). 1745 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1746 * @frame: pointer to the frame that is going to be protected by the RTS. 1747 * @frame_len: the frame length (in octets). 1748 * @frame_txctl: &struct ieee80211_tx_info of the frame. 1749 * @rts: The buffer where to store the RTS frame. 1750 * 1751 * If the RTS frames are generated by the host system (i.e., not in 1752 * hardware/firmware), the low-level driver uses this function to receive 1753 * the next RTS frame from the 802.11 code. The low-level is responsible 1754 * for calling this function before and RTS frame is needed. 1755 */ 1756void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 1757 const void *frame, size_t frame_len, 1758 const struct ieee80211_tx_info *frame_txctl, 1759 struct ieee80211_rts *rts); 1760 1761/** 1762 * ieee80211_rts_duration - Get the duration field for an RTS frame 1763 * @hw: pointer obtained from ieee80211_alloc_hw(). 1764 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1765 * @frame_len: the length of the frame that is going to be protected by the RTS. 1766 * @frame_txctl: &struct ieee80211_tx_info of the frame. 1767 * 1768 * If the RTS is generated in firmware, but the host system must provide 1769 * the duration field, the low-level driver uses this function to receive 1770 * the duration field value in little-endian byteorder. 1771 */ 1772__le16 ieee80211_rts_duration(struct ieee80211_hw *hw, 1773 struct ieee80211_vif *vif, size_t frame_len, 1774 const struct ieee80211_tx_info *frame_txctl); 1775 1776/** 1777 * ieee80211_ctstoself_get - CTS-to-self frame generation function 1778 * @hw: pointer obtained from ieee80211_alloc_hw(). 1779 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1780 * @frame: pointer to the frame that is going to be protected by the CTS-to-self. 1781 * @frame_len: the frame length (in octets). 1782 * @frame_txctl: &struct ieee80211_tx_info of the frame. 1783 * @cts: The buffer where to store the CTS-to-self frame. 1784 * 1785 * If the CTS-to-self frames are generated by the host system (i.e., not in 1786 * hardware/firmware), the low-level driver uses this function to receive 1787 * the next CTS-to-self frame from the 802.11 code. The low-level is responsible 1788 * for calling this function before and CTS-to-self frame is needed. 1789 */ 1790void ieee80211_ctstoself_get(struct ieee80211_hw *hw, 1791 struct ieee80211_vif *vif, 1792 const void *frame, size_t frame_len, 1793 const struct ieee80211_tx_info *frame_txctl, 1794 struct ieee80211_cts *cts); 1795 1796/** 1797 * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame 1798 * @hw: pointer obtained from ieee80211_alloc_hw(). 1799 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1800 * @frame_len: the length of the frame that is going to be protected by the CTS-to-self. 1801 * @frame_txctl: &struct ieee80211_tx_info of the frame. 1802 * 1803 * If the CTS-to-self is generated in firmware, but the host system must provide 1804 * the duration field, the low-level driver uses this function to receive 1805 * the duration field value in little-endian byteorder. 1806 */ 1807__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, 1808 struct ieee80211_vif *vif, 1809 size_t frame_len, 1810 const struct ieee80211_tx_info *frame_txctl); 1811 1812/** 1813 * ieee80211_generic_frame_duration - Calculate the duration field for a frame 1814 * @hw: pointer obtained from ieee80211_alloc_hw(). 1815 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1816 * @frame_len: the length of the frame. 1817 * @rate: the rate at which the frame is going to be transmitted. 1818 * 1819 * Calculate the duration field of some generic frame, given its 1820 * length and transmission rate (in 100kbps). 1821 */ 1822__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, 1823 struct ieee80211_vif *vif, 1824 size_t frame_len, 1825 struct ieee80211_rate *rate); 1826 1827/** 1828 * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames 1829 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1830 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 1831 * 1832 * Function for accessing buffered broadcast and multicast frames. If 1833 * hardware/firmware does not implement buffering of broadcast/multicast 1834 * frames when power saving is used, 802.11 code buffers them in the host 1835 * memory. The low-level driver uses this function to fetch next buffered 1836 * frame. In most cases, this is used when generating beacon frame. This 1837 * function returns a pointer to the next buffered skb or NULL if no more 1838 * buffered frames are available. 1839 * 1840 * Note: buffered frames are returned only after DTIM beacon frame was 1841 * generated with ieee80211_beacon_get() and the low-level driver must thus 1842 * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns 1843 * NULL if the previous generated beacon was not DTIM, so the low-level driver 1844 * does not need to check for DTIM beacons separately and should be able to 1845 * use common code for all beacons. 1846 */ 1847struct sk_buff * 1848ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif); 1849 1850/** 1851 * ieee80211_get_tkip_key - get a TKIP rc4 for skb 1852 * 1853 * This function computes a TKIP rc4 key for an skb. It computes 1854 * a phase 1 key if needed (iv16 wraps around). This function is to 1855 * be used by drivers which can do HW encryption but need to compute 1856 * to phase 1/2 key in SW. 1857 * 1858 * @keyconf: the parameter passed with the set key 1859 * @skb: the skb for which the key is needed 1860 * @type: TBD 1861 * @key: a buffer to which the key will be written 1862 */ 1863void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf, 1864 struct sk_buff *skb, 1865 enum ieee80211_tkip_key_type type, u8 *key); 1866/** 1867 * ieee80211_wake_queue - wake specific queue 1868 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1869 * @queue: queue number (counted from zero). 1870 * 1871 * Drivers should use this function instead of netif_wake_queue. 1872 */ 1873void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue); 1874 1875/** 1876 * ieee80211_stop_queue - stop specific queue 1877 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1878 * @queue: queue number (counted from zero). 1879 * 1880 * Drivers should use this function instead of netif_stop_queue. 1881 */ 1882void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue); 1883 1884/** 1885 * ieee80211_queue_stopped - test status of the queue 1886 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1887 * @queue: queue number (counted from zero). 1888 * 1889 * Drivers should use this function instead of netif_stop_queue. 1890 */ 1891 1892int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue); 1893 1894/** 1895 * ieee80211_stop_queues - stop all queues 1896 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1897 * 1898 * Drivers should use this function instead of netif_stop_queue. 1899 */ 1900void ieee80211_stop_queues(struct ieee80211_hw *hw); 1901 1902/** 1903 * ieee80211_wake_queues - wake all queues 1904 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1905 * 1906 * Drivers should use this function instead of netif_wake_queue. 1907 */ 1908void ieee80211_wake_queues(struct ieee80211_hw *hw); 1909 1910/** 1911 * ieee80211_scan_completed - completed hardware scan 1912 * 1913 * When hardware scan offload is used (i.e. the hw_scan() callback is 1914 * assigned) this function needs to be called by the driver to notify 1915 * mac80211 that the scan finished. 1916 * 1917 * @hw: the hardware that finished the scan 1918 * @aborted: set to true if scan was aborted 1919 */ 1920void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted); 1921 1922/** 1923 * ieee80211_iterate_active_interfaces - iterate active interfaces 1924 * 1925 * This function iterates over the interfaces associated with a given 1926 * hardware that are currently active and calls the callback for them. 1927 * This function allows the iterator function to sleep, when the iterator 1928 * function is atomic @ieee80211_iterate_active_interfaces_atomic can 1929 * be used. 1930 * 1931 * @hw: the hardware struct of which the interfaces should be iterated over 1932 * @iterator: the iterator function to call 1933 * @data: first argument of the iterator function 1934 */ 1935void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw, 1936 void (*iterator)(void *data, u8 *mac, 1937 struct ieee80211_vif *vif), 1938 void *data); 1939 1940/** 1941 * ieee80211_iterate_active_interfaces_atomic - iterate active interfaces 1942 * 1943 * This function iterates over the interfaces associated with a given 1944 * hardware that are currently active and calls the callback for them. 1945 * This function requires the iterator callback function to be atomic, 1946 * if that is not desired, use @ieee80211_iterate_active_interfaces instead. 1947 * 1948 * @hw: the hardware struct of which the interfaces should be iterated over 1949 * @iterator: the iterator function to call, cannot sleep 1950 * @data: first argument of the iterator function 1951 */ 1952void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw, 1953 void (*iterator)(void *data, 1954 u8 *mac, 1955 struct ieee80211_vif *vif), 1956 void *data); 1957 1958/** 1959 * ieee80211_queue_work - add work onto the mac80211 workqueue 1960 * 1961 * Drivers and mac80211 use this to add work onto the mac80211 workqueue. 1962 * This helper ensures drivers are not queueing work when they should not be. 1963 * 1964 * @hw: the hardware struct for the interface we are adding work for 1965 * @work: the work we want to add onto the mac80211 workqueue 1966 */ 1967void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work); 1968 1969/** 1970 * ieee80211_queue_delayed_work - add work onto the mac80211 workqueue 1971 * 1972 * Drivers and mac80211 use this to queue delayed work onto the mac80211 1973 * workqueue. 1974 * 1975 * @hw: the hardware struct for the interface we are adding work for 1976 * @dwork: delayable work to queue onto the mac80211 workqueue 1977 * @delay: number of jiffies to wait before queueing 1978 */ 1979void ieee80211_queue_delayed_work(struct ieee80211_hw *hw, 1980 struct delayed_work *dwork, 1981 unsigned long delay); 1982 1983/** 1984 * ieee80211_start_tx_ba_session - Start a tx Block Ack session. 1985 * @hw: pointer as obtained from ieee80211_alloc_hw(). 1986 * @ra: receiver address of the BA session recipient 1987 * @tid: the TID to BA on. 1988 * 1989 * Return: success if addBA request was sent, failure otherwise 1990 * 1991 * Although mac80211/low level driver/user space application can estimate 1992 * the need to start aggregation on a certain RA/TID, the session level 1993 * will be managed by the mac80211. 1994 */ 1995int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid); 1996 1997/** 1998 * ieee80211_start_tx_ba_cb - low level driver ready to aggregate. 1999 * @hw: pointer as obtained from ieee80211_alloc_hw(). 2000 * @ra: receiver address of the BA session recipient. 2001 * @tid: the TID to BA on. 2002 * 2003 * This function must be called by low level driver once it has 2004 * finished with preparations for the BA session. 2005 */ 2006void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid); 2007 2008/** 2009 * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate. 2010 * @hw: pointer as obtained from ieee80211_alloc_hw(). 2011 * @ra: receiver address of the BA session recipient. 2012 * @tid: the TID to BA on. 2013 * 2014 * This function must be called by low level driver once it has 2015 * finished with preparations for the BA session. 2016 * This version of the function is IRQ-safe. 2017 */ 2018void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra, 2019 u16 tid); 2020 2021/** 2022 * ieee80211_stop_tx_ba_session - Stop a Block Ack session. 2023 * @hw: pointer as obtained from ieee80211_alloc_hw(). 2024 * @ra: receiver address of the BA session recipient 2025 * @tid: the TID to stop BA. 2026 * @initiator: if indicates initiator DELBA frame will be sent. 2027 * 2028 * Return: error if no sta with matching da found, success otherwise 2029 * 2030 * Although mac80211/low level driver/user space application can estimate 2031 * the need to stop aggregation on a certain RA/TID, the session level 2032 * will be managed by the mac80211. 2033 */ 2034int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, 2035 u8 *ra, u16 tid, 2036 enum ieee80211_back_parties initiator); 2037 2038/** 2039 * ieee80211_stop_tx_ba_cb - low level driver ready to stop aggregate. 2040 * @hw: pointer as obtained from ieee80211_alloc_hw(). 2041 * @ra: receiver address of the BA session recipient. 2042 * @tid: the desired TID to BA on. 2043 * 2044 * This function must be called by low level driver once it has 2045 * finished with preparations for the BA session tear down. 2046 */ 2047void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid); 2048 2049/** 2050 * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate. 2051 * @hw: pointer as obtained from ieee80211_alloc_hw(). 2052 * @ra: receiver address of the BA session recipient. 2053 * @tid: the desired TID to BA on. 2054 * 2055 * This function must be called by low level driver once it has 2056 * finished with preparations for the BA session tear down. 2057 * This version of the function is IRQ-safe. 2058 */ 2059void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra, 2060 u16 tid); 2061 2062/** 2063 * ieee80211_find_sta - find a station 2064 * 2065 * @hw: pointer as obtained from ieee80211_alloc_hw() 2066 * @addr: station's address 2067 * 2068 * This function must be called under RCU lock and the 2069 * resulting pointer is only valid under RCU lock as well. 2070 */ 2071struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw, 2072 const u8 *addr); 2073 2074/** 2075 * ieee80211_beacon_loss - inform hardware does not receive beacons 2076 * 2077 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf. 2078 * 2079 * When beacon filtering is enabled with IEEE80211_HW_BEACON_FILTERING and 2080 * IEEE80211_CONF_PS is set, the driver needs to inform whenever the 2081 * hardware is not receiving beacons with this function. 2082 */ 2083void ieee80211_beacon_loss(struct ieee80211_vif *vif); 2084 2085/* Rate control API */ 2086 2087/** 2088 * enum rate_control_changed - flags to indicate which parameter changed 2089 * 2090 * @IEEE80211_RC_HT_CHANGED: The HT parameters of the operating channel have 2091 * changed, rate control algorithm can update its internal state if needed. 2092 */ 2093enum rate_control_changed { 2094 IEEE80211_RC_HT_CHANGED = BIT(0) 2095}; 2096 2097/** 2098 * struct ieee80211_tx_rate_control - rate control information for/from RC algo 2099 * 2100 * @hw: The hardware the algorithm is invoked for. 2101 * @sband: The band this frame is being transmitted on. 2102 * @bss_conf: the current BSS configuration 2103 * @reported_rate: The rate control algorithm can fill this in to indicate 2104 * which rate should be reported to userspace as the current rate and 2105 * used for rate calculations in the mesh network. 2106 * @rts: whether RTS will be used for this frame because it is longer than the 2107 * RTS threshold 2108 * @short_preamble: whether mac80211 will request short-preamble transmission 2109 * if the selected rate supports it 2110 * @max_rate_idx: user-requested maximum rate (not MCS for now) 2111 * @skb: the skb that will be transmitted, the control information in it needs 2112 * to be filled in 2113 */ 2114struct ieee80211_tx_rate_control { 2115 struct ieee80211_hw *hw; 2116 struct ieee80211_supported_band *sband; 2117 struct ieee80211_bss_conf *bss_conf; 2118 struct sk_buff *skb; 2119 struct ieee80211_tx_rate reported_rate; 2120 bool rts, short_preamble; 2121 u8 max_rate_idx; 2122}; 2123 2124struct rate_control_ops { 2125 struct module *module; 2126 const char *name; 2127 void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir); 2128 void (*free)(void *priv); 2129 2130 void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp); 2131 void (*rate_init)(void *priv, struct ieee80211_supported_band *sband, 2132 struct ieee80211_sta *sta, void *priv_sta); 2133 void (*rate_update)(void *priv, struct ieee80211_supported_band *sband, 2134 struct ieee80211_sta *sta, 2135 void *priv_sta, u32 changed); 2136 void (*free_sta)(void *priv, struct ieee80211_sta *sta, 2137 void *priv_sta); 2138 2139 void (*tx_status)(void *priv, struct ieee80211_supported_band *sband, 2140 struct ieee80211_sta *sta, void *priv_sta, 2141 struct sk_buff *skb); 2142 void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta, 2143 struct ieee80211_tx_rate_control *txrc); 2144 2145 void (*add_sta_debugfs)(void *priv, void *priv_sta, 2146 struct dentry *dir); 2147 void (*remove_sta_debugfs)(void *priv, void *priv_sta); 2148}; 2149 2150static inline int rate_supported(struct ieee80211_sta *sta, 2151 enum ieee80211_band band, 2152 int index) 2153{ 2154 return (sta == NULL || sta->supp_rates[band] & BIT(index)); 2155} 2156 2157/** 2158 * rate_control_send_low - helper for drivers for management/no-ack frames 2159 * 2160 * Rate control algorithms that agree to use the lowest rate to 2161 * send management frames and NO_ACK data with the respective hw 2162 * retries should use this in the beginning of their mac80211 get_rate 2163 * callback. If true is returned the rate control can simply return. 2164 * If false is returned we guarantee that sta and sta and priv_sta is 2165 * not null. 2166 * 2167 * Rate control algorithms wishing to do more intelligent selection of 2168 * rate for multicast/broadcast frames may choose to not use this. 2169 * 2170 * @sta: &struct ieee80211_sta pointer to the target destination. Note 2171 * that this may be null. 2172 * @priv_sta: private rate control structure. This may be null. 2173 * @txrc: rate control information we sholud populate for mac80211. 2174 */ 2175bool rate_control_send_low(struct ieee80211_sta *sta, 2176 void *priv_sta, 2177 struct ieee80211_tx_rate_control *txrc); 2178 2179 2180static inline s8 2181rate_lowest_index(struct ieee80211_supported_band *sband, 2182 struct ieee80211_sta *sta) 2183{ 2184 int i; 2185 2186 for (i = 0; i < sband->n_bitrates; i++) 2187 if (rate_supported(sta, sband->band, i)) 2188 return i; 2189 2190 /* warn when we cannot find a rate. */ 2191 WARN_ON(1); 2192 2193 return 0; 2194} 2195 2196static inline 2197bool rate_usable_index_exists(struct ieee80211_supported_band *sband, 2198 struct ieee80211_sta *sta) 2199{ 2200 unsigned int i; 2201 2202 for (i = 0; i < sband->n_bitrates; i++) 2203 if (rate_supported(sta, sband->band, i)) 2204 return true; 2205 return false; 2206} 2207 2208int ieee80211_rate_control_register(struct rate_control_ops *ops); 2209void ieee80211_rate_control_unregister(struct rate_control_ops *ops); 2210 2211static inline bool 2212conf_is_ht20(struct ieee80211_conf *conf) 2213{ 2214 return conf->channel_type == NL80211_CHAN_HT20; 2215} 2216 2217static inline bool 2218conf_is_ht40_minus(struct ieee80211_conf *conf) 2219{ 2220 return conf->channel_type == NL80211_CHAN_HT40MINUS; 2221} 2222 2223static inline bool 2224conf_is_ht40_plus(struct ieee80211_conf *conf) 2225{ 2226 return conf->channel_type == NL80211_CHAN_HT40PLUS; 2227} 2228 2229static inline bool 2230conf_is_ht40(struct ieee80211_conf *conf) 2231{ 2232 return conf_is_ht40_minus(conf) || conf_is_ht40_plus(conf); 2233} 2234 2235static inline bool 2236conf_is_ht(struct ieee80211_conf *conf) 2237{ 2238 return conf->channel_type != NL80211_CHAN_NO_HT; 2239} 2240 2241#endif /* MAC80211_H */ 2242