1 /* 2 * IEEE 802.11 defines 3 * 4 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen 5 * <[email protected]> 6 * Copyright (c) 2002-2003, Jouni Malinen <[email protected]> 7 * Copyright (c) 2005, Devicescape Software, Inc. 8 * Copyright (c) 2006, Michael Wu <[email protected]> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #ifndef IEEE80211_H 16 #define IEEE80211_H 17 18 #include <linux/types.h> 19 #include <asm/byteorder.h> 20 21 #define FCS_LEN 4 22 23 #define IEEE80211_FCTL_VERS 0x0003 24 #define IEEE80211_FCTL_FTYPE 0x000c 25 #define IEEE80211_FCTL_STYPE 0x00f0 26 #define IEEE80211_FCTL_TODS 0x0100 27 #define IEEE80211_FCTL_FROMDS 0x0200 28 #define IEEE80211_FCTL_MOREFRAGS 0x0400 29 #define IEEE80211_FCTL_RETRY 0x0800 30 #define IEEE80211_FCTL_PM 0x1000 31 #define IEEE80211_FCTL_MOREDATA 0x2000 32 #define IEEE80211_FCTL_PROTECTED 0x4000 33 #define IEEE80211_FCTL_ORDER 0x8000 34 35 #define IEEE80211_SCTL_FRAG 0x000F 36 #define IEEE80211_SCTL_SEQ 0xFFF0 37 38 #define IEEE80211_FTYPE_MGMT 0x0000 39 #define IEEE80211_FTYPE_CTL 0x0004 40 #define IEEE80211_FTYPE_DATA 0x0008 41 42 /* management */ 43 #define IEEE80211_STYPE_ASSOC_REQ 0x0000 44 #define IEEE80211_STYPE_ASSOC_RESP 0x0010 45 #define IEEE80211_STYPE_REASSOC_REQ 0x0020 46 #define IEEE80211_STYPE_REASSOC_RESP 0x0030 47 #define IEEE80211_STYPE_PROBE_REQ 0x0040 48 #define IEEE80211_STYPE_PROBE_RESP 0x0050 49 #define IEEE80211_STYPE_BEACON 0x0080 50 #define IEEE80211_STYPE_ATIM 0x0090 51 #define IEEE80211_STYPE_DISASSOC 0x00A0 52 #define IEEE80211_STYPE_AUTH 0x00B0 53 #define IEEE80211_STYPE_DEAUTH 0x00C0 54 #define IEEE80211_STYPE_ACTION 0x00D0 55 56 /* control */ 57 #define IEEE80211_STYPE_BACK_REQ 0x0080 58 #define IEEE80211_STYPE_BACK 0x0090 59 #define IEEE80211_STYPE_PSPOLL 0x00A0 60 #define IEEE80211_STYPE_RTS 0x00B0 61 #define IEEE80211_STYPE_CTS 0x00C0 62 #define IEEE80211_STYPE_ACK 0x00D0 63 #define IEEE80211_STYPE_CFEND 0x00E0 64 #define IEEE80211_STYPE_CFENDACK 0x00F0 65 66 /* data */ 67 #define IEEE80211_STYPE_DATA 0x0000 68 #define IEEE80211_STYPE_DATA_CFACK 0x0010 69 #define IEEE80211_STYPE_DATA_CFPOLL 0x0020 70 #define IEEE80211_STYPE_DATA_CFACKPOLL 0x0030 71 #define IEEE80211_STYPE_NULLFUNC 0x0040 72 #define IEEE80211_STYPE_CFACK 0x0050 73 #define IEEE80211_STYPE_CFPOLL 0x0060 74 #define IEEE80211_STYPE_CFACKPOLL 0x0070 75 #define IEEE80211_STYPE_QOS_DATA 0x0080 76 #define IEEE80211_STYPE_QOS_DATA_CFACK 0x0090 77 #define IEEE80211_STYPE_QOS_DATA_CFPOLL 0x00A0 78 #define IEEE80211_STYPE_QOS_DATA_CFACKPOLL 0x00B0 79 #define IEEE80211_STYPE_QOS_NULLFUNC 0x00C0 80 #define IEEE80211_STYPE_QOS_CFACK 0x00D0 81 #define IEEE80211_STYPE_QOS_CFPOLL 0x00E0 82 #define IEEE80211_STYPE_QOS_CFACKPOLL 0x00F0 83 84 85 /* miscellaneous IEEE 802.11 constants */ 86 #define IEEE80211_MAX_FRAG_THRESHOLD 2352 87 #define IEEE80211_MAX_RTS_THRESHOLD 2353 88 #define IEEE80211_MAX_AID 2007 89 #define IEEE80211_MAX_TIM_LEN 251 90 /* Maximum size for the MA-UNITDATA primitive, 802.11 standard section 91 6.2.1.1.2. 92 93 802.11e clarifies the figure in section 7.1.2. The frame body is 94 up to 2304 octets long (maximum MSDU size) plus any crypt overhead. */ 95 #define IEEE80211_MAX_DATA_LEN 2304 96 /* 30 byte 4 addr hdr, 2 byte QoS, 2304 byte MSDU, 12 byte crypt, 4 byte FCS */ 97 #define IEEE80211_MAX_FRAME_LEN 2352 98 99 #define IEEE80211_MAX_SSID_LEN 32 100 101 struct ieee80211_hdr { 102 __le16 frame_control; 103 __le16 duration_id; 104 u8 addr1[6]; 105 u8 addr2[6]; 106 u8 addr3[6]; 107 __le16 seq_ctrl; 108 u8 addr4[6]; 109 } __attribute__ ((packed)); 110 111 112 struct ieee80211_mgmt { 113 __le16 frame_control; 114 __le16 duration; 115 u8 da[6]; 116 u8 sa[6]; 117 u8 bssid[6]; 118 __le16 seq_ctrl; 119 union { 120 struct { 121 __le16 auth_alg; 122 __le16 auth_transaction; 123 __le16 status_code; 124 /* possibly followed by Challenge text */ 125 u8 variable[0]; 126 } __attribute__ ((packed)) auth; 127 struct { 128 __le16 reason_code; 129 } __attribute__ ((packed)) deauth; 130 struct { 131 __le16 capab_info; 132 __le16 listen_interval; 133 /* followed by SSID and Supported rates */ 134 u8 variable[0]; 135 } __attribute__ ((packed)) assoc_req; 136 struct { 137 __le16 capab_info; 138 __le16 status_code; 139 __le16 aid; 140 /* followed by Supported rates */ 141 u8 variable[0]; 142 } __attribute__ ((packed)) assoc_resp, reassoc_resp; 143 struct { 144 __le16 capab_info; 145 __le16 listen_interval; 146 u8 current_ap[6]; 147 /* followed by SSID and Supported rates */ 148 u8 variable[0]; 149 } __attribute__ ((packed)) reassoc_req; 150 struct { 151 __le16 reason_code; 152 } __attribute__ ((packed)) disassoc; 153 struct { 154 __le64 timestamp; 155 __le16 beacon_int; 156 __le16 capab_info; 157 /* followed by some of SSID, Supported rates, 158 * FH Params, DS Params, CF Params, IBSS Params, TIM */ 159 u8 variable[0]; 160 } __attribute__ ((packed)) beacon; 161 struct { 162 /* only variable items: SSID, Supported rates */ 163 u8 variable[0]; 164 } __attribute__ ((packed)) probe_req; 165 struct { 166 __le64 timestamp; 167 __le16 beacon_int; 168 __le16 capab_info; 169 /* followed by some of SSID, Supported rates, 170 * FH Params, DS Params, CF Params, IBSS Params */ 171 u8 variable[0]; 172 } __attribute__ ((packed)) probe_resp; 173 struct { 174 u8 category; 175 union { 176 struct { 177 u8 action_code; 178 u8 dialog_token; 179 u8 status_code; 180 u8 variable[0]; 181 } __attribute__ ((packed)) wme_action; 182 struct{ 183 u8 action_code; 184 u8 element_id; 185 u8 length; 186 u8 switch_mode; 187 u8 new_chan; 188 u8 switch_count; 189 } __attribute__((packed)) chan_switch; 190 struct{ 191 u8 action_code; 192 u8 dialog_token; 193 __le16 capab; 194 __le16 timeout; 195 __le16 start_seq_num; 196 } __attribute__((packed)) addba_req; 197 struct{ 198 u8 action_code; 199 u8 dialog_token; 200 __le16 status; 201 __le16 capab; 202 __le16 timeout; 203 } __attribute__((packed)) addba_resp; 204 struct{ 205 u8 action_code; 206 __le16 params; 207 __le16 reason_code; 208 } __attribute__((packed)) delba; 209 } u; 210 } __attribute__ ((packed)) action; 211 } u; 212 } __attribute__ ((packed)); 213 214 215 /* Control frames */ 216 struct ieee80211_rts { 217 __le16 frame_control; 218 __le16 duration; 219 u8 ra[6]; 220 u8 ta[6]; 221 } __attribute__ ((packed)); 222 223 struct ieee80211_cts { 224 __le16 frame_control; 225 __le16 duration; 226 u8 ra[6]; 227 } __attribute__ ((packed)); 228 229 /** 230 * struct ieee80211_bar - HT Block Ack Request 231 * 232 * This structure refers to "HT BlockAckReq" as 233 * described in 802.11n draft section 7.2.1.7.1 234 */ 235 struct ieee80211_bar { 236 __le16 frame_control; 237 __le16 duration; 238 __u8 ra[6]; 239 __u8 ta[6]; 240 __le16 control; 241 __le16 start_seq_num; 242 } __attribute__((packed)); 243 244 /** 245 * struct ieee80211_ht_cap - HT capabilities 246 * 247 * This structure refers to "HT capabilities element" as 248 * described in 802.11n draft section 7.3.2.52 249 */ 250 struct ieee80211_ht_cap { 251 __le16 cap_info; 252 u8 ampdu_params_info; 253 u8 supp_mcs_set[16]; 254 __le16 extended_ht_cap_info; 255 __le32 tx_BF_cap_info; 256 u8 antenna_selection_info; 257 } __attribute__ ((packed)); 258 259 /** 260 * struct ieee80211_ht_cap - HT additional information 261 * 262 * This structure refers to "HT information element" as 263 * described in 802.11n draft section 7.3.2.53 264 */ 265 struct ieee80211_ht_addt_info { 266 u8 control_chan; 267 u8 ht_param; 268 __le16 operation_mode; 269 __le16 stbc_param; 270 u8 basic_set[16]; 271 } __attribute__ ((packed)); 272 273 /* 802.11n HT capabilities masks */ 274 #define IEEE80211_HT_CAP_SUP_WIDTH 0x0002 275 #define IEEE80211_HT_CAP_MIMO_PS 0x000C 276 #define IEEE80211_HT_CAP_GRN_FLD 0x0010 277 #define IEEE80211_HT_CAP_SGI_20 0x0020 278 #define IEEE80211_HT_CAP_SGI_40 0x0040 279 #define IEEE80211_HT_CAP_DELAY_BA 0x0400 280 #define IEEE80211_HT_CAP_MAX_AMSDU 0x0800 281 #define IEEE80211_HT_CAP_AMPDU_FACTOR 0x03 282 #define IEEE80211_HT_CAP_AMPDU_DENSITY 0x1C 283 /* 802.11n HT IE masks */ 284 #define IEEE80211_HT_IE_CHA_SEC_OFFSET 0x03 285 #define IEEE80211_HT_IE_CHA_WIDTH 0x04 286 #define IEEE80211_HT_IE_HT_PROTECTION 0x0003 287 #define IEEE80211_HT_IE_NON_GF_STA_PRSNT 0x0004 288 #define IEEE80211_HT_IE_NON_HT_STA_PRSNT 0x0010 289 290 /* Authentication algorithms */ 291 #define WLAN_AUTH_OPEN 0 292 #define WLAN_AUTH_SHARED_KEY 1 293 #define WLAN_AUTH_FAST_BSS_TRANSITION 2 294 #define WLAN_AUTH_LEAP 128 295 296 #define WLAN_AUTH_CHALLENGE_LEN 128 297 298 #define WLAN_CAPABILITY_ESS (1<<0) 299 #define WLAN_CAPABILITY_IBSS (1<<1) 300 #define WLAN_CAPABILITY_CF_POLLABLE (1<<2) 301 #define WLAN_CAPABILITY_CF_POLL_REQUEST (1<<3) 302 #define WLAN_CAPABILITY_PRIVACY (1<<4) 303 #define WLAN_CAPABILITY_SHORT_PREAMBLE (1<<5) 304 #define WLAN_CAPABILITY_PBCC (1<<6) 305 #define WLAN_CAPABILITY_CHANNEL_AGILITY (1<<7) 306 /* 802.11h */ 307 #define WLAN_CAPABILITY_SPECTRUM_MGMT (1<<8) 308 #define WLAN_CAPABILITY_QOS (1<<9) 309 #define WLAN_CAPABILITY_SHORT_SLOT_TIME (1<<10) 310 #define WLAN_CAPABILITY_DSSS_OFDM (1<<13) 311 312 /* 802.11g ERP information element */ 313 #define WLAN_ERP_NON_ERP_PRESENT (1<<0) 314 #define WLAN_ERP_USE_PROTECTION (1<<1) 315 #define WLAN_ERP_BARKER_PREAMBLE (1<<2) 316 317 /* WLAN_ERP_BARKER_PREAMBLE values */ 318 enum { 319 WLAN_ERP_PREAMBLE_SHORT = 0, 320 WLAN_ERP_PREAMBLE_LONG = 1, 321 }; 322 323 /* Status codes */ 324 enum ieee80211_statuscode { 325 WLAN_STATUS_SUCCESS = 0, 326 WLAN_STATUS_UNSPECIFIED_FAILURE = 1, 327 WLAN_STATUS_CAPS_UNSUPPORTED = 10, 328 WLAN_STATUS_REASSOC_NO_ASSOC = 11, 329 WLAN_STATUS_ASSOC_DENIED_UNSPEC = 12, 330 WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG = 13, 331 WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION = 14, 332 WLAN_STATUS_CHALLENGE_FAIL = 15, 333 WLAN_STATUS_AUTH_TIMEOUT = 16, 334 WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA = 17, 335 WLAN_STATUS_ASSOC_DENIED_RATES = 18, 336 /* 802.11b */ 337 WLAN_STATUS_ASSOC_DENIED_NOSHORTPREAMBLE = 19, 338 WLAN_STATUS_ASSOC_DENIED_NOPBCC = 20, 339 WLAN_STATUS_ASSOC_DENIED_NOAGILITY = 21, 340 /* 802.11h */ 341 WLAN_STATUS_ASSOC_DENIED_NOSPECTRUM = 22, 342 WLAN_STATUS_ASSOC_REJECTED_BAD_POWER = 23, 343 WLAN_STATUS_ASSOC_REJECTED_BAD_SUPP_CHAN = 24, 344 /* 802.11g */ 345 WLAN_STATUS_ASSOC_DENIED_NOSHORTTIME = 25, 346 WLAN_STATUS_ASSOC_DENIED_NODSSSOFDM = 26, 347 /* 802.11i */ 348 WLAN_STATUS_INVALID_IE = 40, 349 WLAN_STATUS_INVALID_GROUP_CIPHER = 41, 350 WLAN_STATUS_INVALID_PAIRWISE_CIPHER = 42, 351 WLAN_STATUS_INVALID_AKMP = 43, 352 WLAN_STATUS_UNSUPP_RSN_VERSION = 44, 353 WLAN_STATUS_INVALID_RSN_IE_CAP = 45, 354 WLAN_STATUS_CIPHER_SUITE_REJECTED = 46, 355 /* 802.11e */ 356 WLAN_STATUS_UNSPECIFIED_QOS = 32, 357 WLAN_STATUS_ASSOC_DENIED_NOBANDWIDTH = 33, 358 WLAN_STATUS_ASSOC_DENIED_LOWACK = 34, 359 WLAN_STATUS_ASSOC_DENIED_UNSUPP_QOS = 35, 360 WLAN_STATUS_REQUEST_DECLINED = 37, 361 WLAN_STATUS_INVALID_QOS_PARAM = 38, 362 WLAN_STATUS_CHANGE_TSPEC = 39, 363 WLAN_STATUS_WAIT_TS_DELAY = 47, 364 WLAN_STATUS_NO_DIRECT_LINK = 48, 365 WLAN_STATUS_STA_NOT_PRESENT = 49, 366 WLAN_STATUS_STA_NOT_QSTA = 50, 367 }; 368 369 370 /* Reason codes */ 371 enum ieee80211_reasoncode { 372 WLAN_REASON_UNSPECIFIED = 1, 373 WLAN_REASON_PREV_AUTH_NOT_VALID = 2, 374 WLAN_REASON_DEAUTH_LEAVING = 3, 375 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY = 4, 376 WLAN_REASON_DISASSOC_AP_BUSY = 5, 377 WLAN_REASON_CLASS2_FRAME_FROM_NONAUTH_STA = 6, 378 WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA = 7, 379 WLAN_REASON_DISASSOC_STA_HAS_LEFT = 8, 380 WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH = 9, 381 /* 802.11h */ 382 WLAN_REASON_DISASSOC_BAD_POWER = 10, 383 WLAN_REASON_DISASSOC_BAD_SUPP_CHAN = 11, 384 /* 802.11i */ 385 WLAN_REASON_INVALID_IE = 13, 386 WLAN_REASON_MIC_FAILURE = 14, 387 WLAN_REASON_4WAY_HANDSHAKE_TIMEOUT = 15, 388 WLAN_REASON_GROUP_KEY_HANDSHAKE_TIMEOUT = 16, 389 WLAN_REASON_IE_DIFFERENT = 17, 390 WLAN_REASON_INVALID_GROUP_CIPHER = 18, 391 WLAN_REASON_INVALID_PAIRWISE_CIPHER = 19, 392 WLAN_REASON_INVALID_AKMP = 20, 393 WLAN_REASON_UNSUPP_RSN_VERSION = 21, 394 WLAN_REASON_INVALID_RSN_IE_CAP = 22, 395 WLAN_REASON_IEEE8021X_FAILED = 23, 396 WLAN_REASON_CIPHER_SUITE_REJECTED = 24, 397 /* 802.11e */ 398 WLAN_REASON_DISASSOC_UNSPECIFIED_QOS = 32, 399 WLAN_REASON_DISASSOC_QAP_NO_BANDWIDTH = 33, 400 WLAN_REASON_DISASSOC_LOW_ACK = 34, 401 WLAN_REASON_DISASSOC_QAP_EXCEED_TXOP = 35, 402 WLAN_REASON_QSTA_LEAVE_QBSS = 36, 403 WLAN_REASON_QSTA_NOT_USE = 37, 404 WLAN_REASON_QSTA_REQUIRE_SETUP = 38, 405 WLAN_REASON_QSTA_TIMEOUT = 39, 406 WLAN_REASON_QSTA_CIPHER_NOT_SUPP = 45, 407 }; 408 409 410 /* Information Element IDs */ 411 enum ieee80211_eid { 412 WLAN_EID_SSID = 0, 413 WLAN_EID_SUPP_RATES = 1, 414 WLAN_EID_FH_PARAMS = 2, 415 WLAN_EID_DS_PARAMS = 3, 416 WLAN_EID_CF_PARAMS = 4, 417 WLAN_EID_TIM = 5, 418 WLAN_EID_IBSS_PARAMS = 6, 419 WLAN_EID_CHALLENGE = 16, 420 /* 802.11d */ 421 WLAN_EID_COUNTRY = 7, 422 WLAN_EID_HP_PARAMS = 8, 423 WLAN_EID_HP_TABLE = 9, 424 WLAN_EID_REQUEST = 10, 425 /* 802.11e */ 426 WLAN_EID_QBSS_LOAD = 11, 427 WLAN_EID_EDCA_PARAM_SET = 12, 428 WLAN_EID_TSPEC = 13, 429 WLAN_EID_TCLAS = 14, 430 WLAN_EID_SCHEDULE = 15, 431 WLAN_EID_TS_DELAY = 43, 432 WLAN_EID_TCLAS_PROCESSING = 44, 433 WLAN_EID_QOS_CAPA = 46, 434 /* 802.11h */ 435 WLAN_EID_PWR_CONSTRAINT = 32, 436 WLAN_EID_PWR_CAPABILITY = 33, 437 WLAN_EID_TPC_REQUEST = 34, 438 WLAN_EID_TPC_REPORT = 35, 439 WLAN_EID_SUPPORTED_CHANNELS = 36, 440 WLAN_EID_CHANNEL_SWITCH = 37, 441 WLAN_EID_MEASURE_REQUEST = 38, 442 WLAN_EID_MEASURE_REPORT = 39, 443 WLAN_EID_QUIET = 40, 444 WLAN_EID_IBSS_DFS = 41, 445 /* 802.11g */ 446 WLAN_EID_ERP_INFO = 42, 447 WLAN_EID_EXT_SUPP_RATES = 50, 448 /* 802.11n */ 449 WLAN_EID_HT_CAPABILITY = 45, 450 WLAN_EID_HT_EXTRA_INFO = 61, 451 /* 802.11i */ 452 WLAN_EID_RSN = 48, 453 WLAN_EID_WPA = 221, 454 WLAN_EID_GENERIC = 221, 455 WLAN_EID_VENDOR_SPECIFIC = 221, 456 WLAN_EID_QOS_PARAMETER = 222 457 }; 458 459 /* Action category code */ 460 enum ieee80211_category { 461 WLAN_CATEGORY_SPECTRUM_MGMT = 0, 462 WLAN_CATEGORY_QOS = 1, 463 WLAN_CATEGORY_DLS = 2, 464 WLAN_CATEGORY_BACK = 3, 465 WLAN_CATEGORY_WMM = 17, 466 }; 467 468 /* BACK action code */ 469 enum ieee80211_back_actioncode { 470 WLAN_ACTION_ADDBA_REQ = 0, 471 WLAN_ACTION_ADDBA_RESP = 1, 472 WLAN_ACTION_DELBA = 2, 473 }; 474 475 /* BACK (block-ack) parties */ 476 enum ieee80211_back_parties { 477 WLAN_BACK_RECIPIENT = 0, 478 WLAN_BACK_INITIATOR = 1, 479 WLAN_BACK_TIMER = 2, 480 }; 481 482 /* A-MSDU 802.11n */ 483 #define IEEE80211_QOS_CONTROL_A_MSDU_PRESENT 0x0080 484 485 /* cipher suite selectors */ 486 #define WLAN_CIPHER_SUITE_USE_GROUP 0x000FAC00 487 #define WLAN_CIPHER_SUITE_WEP40 0x000FAC01 488 #define WLAN_CIPHER_SUITE_TKIP 0x000FAC02 489 /* reserved: 0x000FAC03 */ 490 #define WLAN_CIPHER_SUITE_CCMP 0x000FAC04 491 #define WLAN_CIPHER_SUITE_WEP104 0x000FAC05 492 493 #define WLAN_MAX_KEY_LEN 32 494 495 /** 496 * ieee80211_get_SA - get pointer to SA 497 * 498 * Given an 802.11 frame, this function returns the offset 499 * to the source address (SA). It does not verify that the 500 * header is long enough to contain the address, and the 501 * header must be long enough to contain the frame control 502 * field. 503 * 504 * @hdr: the frame 505 */ 506 static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr) 507 { 508 u8 *raw = (u8 *) hdr; 509 u8 tofrom = (*(raw+1)) & 3; /* get the TODS and FROMDS bits */ 510 511 switch (tofrom) { 512 case 2: 513 return hdr->addr3; 514 case 3: 515 return hdr->addr4; 516 } 517 return hdr->addr2; 518 } 519 520 /** 521 * ieee80211_get_DA - get pointer to DA 522 * 523 * Given an 802.11 frame, this function returns the offset 524 * to the destination address (DA). It does not verify that 525 * the header is long enough to contain the address, and the 526 * header must be long enough to contain the frame control 527 * field. 528 * 529 * @hdr: the frame 530 */ 531 static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr) 532 { 533 u8 *raw = (u8 *) hdr; 534 u8 to_ds = (*(raw+1)) & 1; /* get the TODS bit */ 535 536 if (to_ds) 537 return hdr->addr3; 538 return hdr->addr1; 539 } 540 541 /** 542 * ieee80211_get_morefrag - determine whether the MOREFRAGS bit is set 543 * 544 * This function determines whether the "more fragments" bit is set 545 * in the frame. 546 * 547 * @hdr: the frame 548 */ 549 static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr) 550 { 551 return (le16_to_cpu(hdr->frame_control) & 552 IEEE80211_FCTL_MOREFRAGS) != 0; 553 } 554 555 #endif /* IEEE80211_H */ 556