include/linux/ieee80211.h

   1 /*
   2  * IEEE 802.11 defines
   3  *
   4  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   5  * <jkmaline@cc.hut.fi>
   6  * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
   7  * Copyright (c) 2005, Devicescape Software, Inc.
   8  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   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 #define IEEE80211_MAX_MESH_ID_LEN       32
 101 #define IEEE80211_QOS_CTL_LEN           2
 102 #define IEEE80211_QOS_CTL_TID_MASK      0x000F
 103 #define IEEE80211_QOS_CTL_TAG1D_MASK    0x0007
 104
 105 struct ieee80211_hdr {
 106         __le16 frame_control;
 107         __le16 duration_id;
 108         u8 addr1[6];
 109         u8 addr2[6];
 110         u8 addr3[6];
 111         __le16 seq_ctrl;
 112         u8 addr4[6];
 113 } __attribute__ ((packed));
 114
 115 /**
 116  * ieee80211_has_tods - check if IEEE80211_FCTL_TODS is set
 117  * @fc: frame control bytes in little-endian byteorder
 118  */
 119 static inline int ieee80211_has_tods(__le16 fc)
 120 {
 121         return (fc & cpu_to_le16(IEEE80211_FCTL_TODS)) != 0;
 122 }
 123
 124 /**
 125  * ieee80211_has_fromds - check if IEEE80211_FCTL_FROMDS is set
 126  * @fc: frame control bytes in little-endian byteorder
 127  */
 128 static inline int ieee80211_has_fromds(__le16 fc)
 129 {
 130         return (fc & cpu_to_le16(IEEE80211_FCTL_FROMDS)) != 0;
 131 }
 132
 133 /**
 134  * ieee80211_has_a4 - check if IEEE80211_FCTL_TODS and IEEE80211_FCTL_FROMDS are set
 135  * @fc: frame control bytes in little-endian byteorder
 136  */
 137 static inline int ieee80211_has_a4(__le16 fc)
 138 {
 139         __le16 tmp = cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
 140         return (fc & tmp) == tmp;
 141 }
 142
 143 /**
 144  * ieee80211_has_morefrags - check if IEEE80211_FCTL_MOREFRAGS is set
 145  * @fc: frame control bytes in little-endian byteorder
 146  */
 147 static inline int ieee80211_has_morefrags(__le16 fc)
 148 {
 149         return (fc & cpu_to_le16(IEEE80211_FCTL_MOREFRAGS)) != 0;
 150 }
 151
 152 /**
 153  * ieee80211_has_retry - check if IEEE80211_FCTL_RETRY is set
 154  * @fc: frame control bytes in little-endian byteorder
 155  */
 156 static inline int ieee80211_has_retry(__le16 fc)
 157 {
 158         return (fc & cpu_to_le16(IEEE80211_FCTL_RETRY)) != 0;
 159 }
 160
 161 /**
 162  * ieee80211_has_pm - check if IEEE80211_FCTL_PM is set
 163  * @fc: frame control bytes in little-endian byteorder
 164  */
 165 static inline int ieee80211_has_pm(__le16 fc)
 166 {
 167         return (fc & cpu_to_le16(IEEE80211_FCTL_PM)) != 0;
 168 }
 169
 170 /**
 171  * ieee80211_has_moredata - check if IEEE80211_FCTL_MOREDATA is set
 172  * @fc: frame control bytes in little-endian byteorder
 173  */
 174 static inline int ieee80211_has_moredata(__le16 fc)
 175 {
 176         return (fc & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) != 0;
 177 }
 178
 179 /**
 180  * ieee80211_has_protected - check if IEEE80211_FCTL_PROTECTED is set
 181  * @fc: frame control bytes in little-endian byteorder
 182  */
 183 static inline int ieee80211_has_protected(__le16 fc)
 184 {
 185         return (fc & cpu_to_le16(IEEE80211_FCTL_PROTECTED)) != 0;
 186 }
 187
 188 /**
 189  * ieee80211_has_order - check if IEEE80211_FCTL_ORDER is set
 190  * @fc: frame control bytes in little-endian byteorder
 191  */
 192 static inline int ieee80211_has_order(__le16 fc)
 193 {
 194         return (fc & cpu_to_le16(IEEE80211_FCTL_ORDER)) != 0;
 195 }
 196
 197 /**
 198  * ieee80211_is_mgmt - check if type is IEEE80211_FTYPE_MGMT
 199  * @fc: frame control bytes in little-endian byteorder
 200  */
 201 static inline int ieee80211_is_mgmt(__le16 fc)
 202 {
 203         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
 204                cpu_to_le16(IEEE80211_FTYPE_MGMT);
 205 }
 206
 207 /**
 208  * ieee80211_is_ctl - check if type is IEEE80211_FTYPE_CTL
 209  * @fc: frame control bytes in little-endian byteorder
 210  */
 211 static inline int ieee80211_is_ctl(__le16 fc)
 212 {
 213         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
 214                cpu_to_le16(IEEE80211_FTYPE_CTL);
 215 }
 216
 217 /**
 218  * ieee80211_is_data - check if type is IEEE80211_FTYPE_DATA
 219  * @fc: frame control bytes in little-endian byteorder
 220  */
 221 static inline int ieee80211_is_data(__le16 fc)
 222 {
 223         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
 224                cpu_to_le16(IEEE80211_FTYPE_DATA);
 225 }
 226
 227 /**
 228  * ieee80211_is_data_qos - check if type is IEEE80211_FTYPE_DATA and IEEE80211_STYPE_QOS_DATA is set
 229  * @fc: frame control bytes in little-endian byteorder
 230  */
 231 static inline int ieee80211_is_data_qos(__le16 fc)
 232 {
 233         /*
 234          * mask with QOS_DATA rather than IEEE80211_FCTL_STYPE as we just need
 235          * to check the one bit
 236          */
 237         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_STYPE_QOS_DATA)) ==
 238                cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA);
 239 }
 240
 241 /**
 242  * ieee80211_is_data_present - check if type is IEEE80211_FTYPE_DATA and has data
 243  * @fc: frame control bytes in little-endian byteorder
 244  */
 245 static inline int ieee80211_is_data_present(__le16 fc)
 246 {
 247         /*
 248          * mask with 0x40 and test that that bit is clear to only return true
 249          * for the data-containing substypes.
 250          */
 251         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | 0x40)) ==
 252                cpu_to_le16(IEEE80211_FTYPE_DATA);
 253 }
 254
 255 /**
 256  * ieee80211_is_assoc_req - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ASSOC_REQ
 257  * @fc: frame control bytes in little-endian byteorder
 258  */
 259 static inline int ieee80211_is_assoc_req(__le16 fc)
 260 {
 261         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 262                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ASSOC_REQ);
 263 }
 264
 265 /**
 266  * ieee80211_is_assoc_resp - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ASSOC_RESP
 267  * @fc: frame control bytes in little-endian byteorder
 268  */
 269 static inline int ieee80211_is_assoc_resp(__le16 fc)
 270 {
 271         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 272                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ASSOC_RESP);
 273 }
 274
 275 /**
 276  * ieee80211_is_reassoc_req - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_REASSOC_REQ
 277  * @fc: frame control bytes in little-endian byteorder
 278  */
 279 static inline int ieee80211_is_reassoc_req(__le16 fc)
 280 {
 281         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 282                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_REASSOC_REQ);
 283 }
 284
 285 /**
 286  * ieee80211_is_reassoc_resp - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_REASSOC_RESP
 287  * @fc: frame control bytes in little-endian byteorder
 288  */
 289 static inline int ieee80211_is_reassoc_resp(__le16 fc)
 290 {
 291         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 292                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_REASSOC_RESP);
 293 }
 294
 295 /**
 296  * ieee80211_is_probe_req - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_PROBE_REQ
 297  * @fc: frame control bytes in little-endian byteorder
 298  */
 299 static inline int ieee80211_is_probe_req(__le16 fc)
 300 {
 301         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 302                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ);
 303 }
 304
 305 /**
 306  * ieee80211_is_probe_resp - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_PROBE_RESP
 307  * @fc: frame control bytes in little-endian byteorder
 308  */
 309 static inline int ieee80211_is_probe_resp(__le16 fc)
 310 {
 311         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 312                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_RESP);
 313 }
 314
 315 /**
 316  * ieee80211_is_beacon - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_BEACON
 317  * @fc: frame control bytes in little-endian byteorder
 318  */
 319 static inline int ieee80211_is_beacon(__le16 fc)
 320 {
 321         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 322                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
 323 }
 324
 325 /**
 326  * ieee80211_is_atim - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ATIM
 327  * @fc: frame control bytes in little-endian byteorder
 328  */
 329 static inline int ieee80211_is_atim(__le16 fc)
 330 {
 331         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 332                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ATIM);
 333 }
 334
 335 /**
 336  * ieee80211_is_disassoc - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_DISASSOC
 337  * @fc: frame control bytes in little-endian byteorder
 338  */
 339 static inline int ieee80211_is_disassoc(__le16 fc)
 340 {
 341         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 342                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_DISASSOC);
 343 }
 344
 345 /**
 346  * ieee80211_is_auth - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_AUTH
 347  * @fc: frame control bytes in little-endian byteorder
 348  */
 349 static inline int ieee80211_is_auth(__le16 fc)
 350 {
 351         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 352                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_AUTH);
 353 }
 354
 355 /**
 356  * ieee80211_is_deauth - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_DEAUTH
 357  * @fc: frame control bytes in little-endian byteorder
 358  */
 359 static inline int ieee80211_is_deauth(__le16 fc)
 360 {
 361         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 362                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_DEAUTH);
 363 }
 364
 365 /**
 366  * ieee80211_is_action - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ACTION
 367  * @fc: frame control bytes in little-endian byteorder
 368  */
 369 static inline int ieee80211_is_action(__le16 fc)
 370 {
 371         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 372                cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION);
 373 }
 374
 375 /**
 376  * ieee80211_is_back_req - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_BACK_REQ
 377  * @fc: frame control bytes in little-endian byteorder
 378  */
 379 static inline int ieee80211_is_back_req(__le16 fc)
 380 {
 381         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 382                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK_REQ);
 383 }
 384
 385 /**
 386  * ieee80211_is_back - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_BACK
 387  * @fc: frame control bytes in little-endian byteorder
 388  */
 389 static inline int ieee80211_is_back(__le16 fc)
 390 {
 391         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 392                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 393 }
 394
 395 /**
 396  * ieee80211_is_pspoll - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_PSPOLL
 397  * @fc: frame control bytes in little-endian byteorder
 398  */
 399 static inline int ieee80211_is_pspoll(__le16 fc)
 400 {
 401         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 402                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL);
 403 }
 404
 405 /**
 406  * ieee80211_is_rts - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_RTS
 407  * @fc: frame control bytes in little-endian byteorder
 408  */
 409 static inline int ieee80211_is_rts(__le16 fc)
 410 {
 411         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 412                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
 413 }
 414
 415 /**
 416  * ieee80211_is_cts - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_CTS
 417  * @fc: frame control bytes in little-endian byteorder
 418  */
 419 static inline int ieee80211_is_cts(__le16 fc)
 420 {
 421         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 422                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 423 }
 424
 425 /**
 426  * ieee80211_is_ack - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_ACK
 427  * @fc: frame control bytes in little-endian byteorder
 428  */
 429 static inline int ieee80211_is_ack(__le16 fc)
 430 {
 431         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 432                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK);
 433 }
 434
 435 /**
 436  * ieee80211_is_cfend - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_CFEND
 437  * @fc: frame control bytes in little-endian byteorder
 438  */
 439 static inline int ieee80211_is_cfend(__le16 fc)
 440 {
 441         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 442                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CFEND);
 443 }
 444
 445 /**
 446  * ieee80211_is_cfendack - check if IEEE80211_FTYPE_CTL && IEEE80211_STYPE_CFENDACK
 447  * @fc: frame control bytes in little-endian byteorder
 448  */
 449 static inline int ieee80211_is_cfendack(__le16 fc)
 450 {
 451         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 452                cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CFENDACK);
 453 }
 454
 455 /**
 456  * ieee80211_is_nullfunc - check if FTYPE=IEEE80211_FTYPE_DATA and STYPE=IEEE80211_STYPE_NULLFUNC
 457  * @fc: frame control bytes in little-endian byteorder
 458  */
 459 static inline int ieee80211_is_nullfunc(__le16 fc)
 460 {
 461         return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 462                cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC);
 463 }
 464
 465 struct ieee80211s_hdr {
 466         u8 flags;
 467         u8 ttl;
 468         __le32 seqnum;
 469         u8 eaddr1[6];
 470         u8 eaddr2[6];
 471         u8 eaddr3[6];
 472 } __attribute__ ((packed));
 473
 474 /**
 475  * struct ieee80211_quiet_ie
 476  *
 477  * This structure refers to "Quiet information element"
 478  */
 479 struct ieee80211_quiet_ie {
 480         u8 count;
 481         u8 period;
 482         __le16 duration;
 483         __le16 offset;
 484 } __attribute__ ((packed));
 485
 486 /**
 487  * struct ieee80211_msrment_ie
 488  *
 489  * This structure refers to "Measurement Request/Report information element"
 490  */
 491 struct ieee80211_msrment_ie {
 492         u8 token;
 493         u8 mode;
 494         u8 type;
 495         u8 request[0];
 496 } __attribute__ ((packed));
 497
 498 /**
 499  * struct ieee80211_channel_sw_ie
 500  *
 501  * This structure refers to "Channel Switch Announcement information element"
 502  */
 503 struct ieee80211_channel_sw_ie {
 504         u8 mode;
 505         u8 new_ch_num;
 506         u8 count;
 507 } __attribute__ ((packed));
 508
 509 struct ieee80211_mgmt {
 510         __le16 frame_control;
 511         __le16 duration;
 512         u8 da[6];
 513         u8 sa[6];
 514         u8 bssid[6];
 515         __le16 seq_ctrl;
 516         union {
 517                 struct {
 518                         __le16 auth_alg;
 519                         __le16 auth_transaction;
 520                         __le16 status_code;
 521                         /* possibly followed by Challenge text */
 522                         u8 variable[0];
 523                 } __attribute__ ((packed)) auth;
 524                 struct {
 525                         __le16 reason_code;
 526                 } __attribute__ ((packed)) deauth;
 527                 struct {
 528                         __le16 capab_info;
 529                         __le16 listen_interval;
 530                         /* followed by SSID and Supported rates */
 531                         u8 variable[0];
 532                 } __attribute__ ((packed)) assoc_req;
 533                 struct {
 534                         __le16 capab_info;
 535                         __le16 status_code;
 536                         __le16 aid;
 537                         /* followed by Supported rates */
 538                         u8 variable[0];
 539                 } __attribute__ ((packed)) assoc_resp, reassoc_resp;
 540                 struct {
 541                         __le16 capab_info;
 542                         __le16 listen_interval;
 543                         u8 current_ap[6];
 544                         /* followed by SSID and Supported rates */
 545                         u8 variable[0];
 546                 } __attribute__ ((packed)) reassoc_req;
 547                 struct {
 548                         __le16 reason_code;
 549                 } __attribute__ ((packed)) disassoc;
 550                 struct {
 551                         __le64 timestamp;
 552                         __le16 beacon_int;
 553                         __le16 capab_info;
 554                         /* followed by some of SSID, Supported rates,
 555                          * FH Params, DS Params, CF Params, IBSS Params, TIM */
 556                         u8 variable[0];
 557                 } __attribute__ ((packed)) beacon;
 558                 struct {
 559                         /* only variable items: SSID, Supported rates */
 560                         u8 variable[0];
 561                 } __attribute__ ((packed)) probe_req;
 562                 struct {
 563                         __le64 timestamp;
 564                         __le16 beacon_int;
 565                         __le16 capab_info;
 566                         /* followed by some of SSID, Supported rates,
 567                          * FH Params, DS Params, CF Params, IBSS Params */
 568                         u8 variable[0];
 569                 } __attribute__ ((packed)) probe_resp;
 570                 struct {
 571                         u8 category;
 572                         union {
 573                                 struct {
 574                                         u8 action_code;
 575                                         u8 dialog_token;
 576                                         u8 status_code;
 577                                         u8 variable[0];
 578                                 } __attribute__ ((packed)) wme_action;
 579                                 struct{
 580                                         u8 action_code;
 581                                         u8 element_id;
 582                                         u8 length;
 583                                         struct ieee80211_channel_sw_ie sw_elem;
 584                                 } __attribute__((packed)) chan_switch;
 585                                 struct{
 586                                         u8 action_code;
 587                                         u8 dialog_token;
 588                                         u8 element_id;
 589                                         u8 length;
 590                                         struct ieee80211_msrment_ie msr_elem;
 591                                 } __attribute__((packed)) measurement;
 592                                 struct{
 593                                         u8 action_code;
 594                                         u8 dialog_token;
 595                                         __le16 capab;
 596                                         __le16 timeout;
 597                                         __le16 start_seq_num;
 598                                 } __attribute__((packed)) addba_req;
 599                                 struct{
 600                                         u8 action_code;
 601                                         u8 dialog_token;
 602                                         __le16 status;
 603                                         __le16 capab;
 604                                         __le16 timeout;
 605                                 } __attribute__((packed)) addba_resp;
 606                                 struct{
 607                                         u8 action_code;
 608                                         __le16 params;
 609                                         __le16 reason_code;
 610                                 } __attribute__((packed)) delba;
 611                                 struct{
 612                                         u8 action_code;
 613                                         /* capab_info for open and confirm,
 614                                          * reason for close
 615                                          */
 616                                         __le16 aux;
 617                                         /* Followed in plink_confirm by status
 618                                          * code, AID and supported rates,
 619                                          * and directly by supported rates in
 620                                          * plink_open and plink_close
 621                                          */
 622                                         u8 variable[0];
 623                                 } __attribute__((packed)) plink_action;
 624                                 struct{
 625                                         u8 action_code;
 626                                         u8 variable[0];
 627                                 } __attribute__((packed)) mesh_action;
 628                         } u;
 629                 } __attribute__ ((packed)) action;
 630         } u;
 631 } __attribute__ ((packed));
 632
 633
 634 /* Control frames */
 635 struct ieee80211_rts {
 636         __le16 frame_control;
 637         __le16 duration;
 638         u8 ra[6];
 639         u8 ta[6];
 640 } __attribute__ ((packed));
 641
 642 struct ieee80211_cts {
 643         __le16 frame_control;
 644         __le16 duration;
 645         u8 ra[6];
 646 } __attribute__ ((packed));
 647
 648 /**
 649  * struct ieee80211_bar - HT Block Ack Request
 650  *
 651  * This structure refers to "HT BlockAckReq" as
 652  * described in 802.11n draft section 7.2.1.7.1
 653  */
 654 struct ieee80211_bar {
 655         __le16 frame_control;
 656         __le16 duration;
 657         __u8 ra[6];
 658         __u8 ta[6];
 659         __le16 control;
 660         __le16 start_seq_num;
 661 } __attribute__((packed));
 662
 663 /* 802.11 BAR control masks */
 664 #define IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL     0x0000
 665 #define IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA  0x0004
 666
 667 /**
 668  * struct ieee80211_ht_cap - HT capabilities
 669  *
 670  * This structure refers to "HT capabilities element" as
 671  * described in 802.11n draft section 7.3.2.52
 672  */
 673 struct ieee80211_ht_cap {
 674         __le16 cap_info;
 675         u8 ampdu_params_info;
 676         u8 supp_mcs_set[16];
 677         __le16 extended_ht_cap_info;
 678         __le32 tx_BF_cap_info;
 679         u8 antenna_selection_info;
 680 } __attribute__ ((packed));
 681
 682 /**
 683  * struct ieee80211_ht_cap - HT additional information
 684  *
 685  * This structure refers to "HT information element" as
 686  * described in 802.11n draft section 7.3.2.53
 687  */
 688 struct ieee80211_ht_addt_info {
 689         u8 control_chan;
 690         u8 ht_param;
 691         __le16 operation_mode;
 692         __le16 stbc_param;
 693         u8 basic_set[16];
 694 } __attribute__ ((packed));
 695
 696 /* 802.11n HT capabilities masks */
 697 #define IEEE80211_HT_CAP_SUP_WIDTH              0x0002
 698 #define IEEE80211_HT_CAP_MIMO_PS                0x000C
 699 #define IEEE80211_HT_CAP_GRN_FLD                0x0010
 700 #define IEEE80211_HT_CAP_SGI_20                 0x0020
 701 #define IEEE80211_HT_CAP_SGI_40                 0x0040
 702 #define IEEE80211_HT_CAP_DELAY_BA               0x0400
 703 #define IEEE80211_HT_CAP_MAX_AMSDU              0x0800
 704 /* 802.11n HT capability AMPDU settings */
 705 #define IEEE80211_HT_CAP_AMPDU_FACTOR           0x03
 706 #define IEEE80211_HT_CAP_AMPDU_DENSITY          0x1C
 707 /* 802.11n HT capability MSC set */
 708 #define IEEE80211_SUPP_MCS_SET_UEQM             4
 709 #define IEEE80211_HT_CAP_MAX_STREAMS            4
 710 #define IEEE80211_SUPP_MCS_SET_LEN              10
 711 /* maximum streams the spec allows */
 712 #define IEEE80211_HT_CAP_MCS_TX_DEFINED         0x01
 713 #define IEEE80211_HT_CAP_MCS_TX_RX_DIFF         0x02
 714 #define IEEE80211_HT_CAP_MCS_TX_STREAMS         0x0C
 715 #define IEEE80211_HT_CAP_MCS_TX_UEQM            0x10
 716 /* 802.11n HT IE masks */
 717 #define IEEE80211_HT_IE_CHA_SEC_OFFSET          0x03
 718 #define IEEE80211_HT_IE_CHA_SEC_NONE            0x00
 719 #define IEEE80211_HT_IE_CHA_SEC_ABOVE           0x01
 720 #define IEEE80211_HT_IE_CHA_SEC_BELOW           0x03
 721 #define IEEE80211_HT_IE_CHA_WIDTH               0x04
 722 #define IEEE80211_HT_IE_HT_PROTECTION           0x0003
 723 #define IEEE80211_HT_IE_NON_GF_STA_PRSNT        0x0004
 724 #define IEEE80211_HT_IE_NON_HT_STA_PRSNT        0x0010
 725
 726 /* MIMO Power Save Modes */
 727 #define WLAN_HT_CAP_MIMO_PS_STATIC      0
 728 #define WLAN_HT_CAP_MIMO_PS_DYNAMIC     1
 729 #define WLAN_HT_CAP_MIMO_PS_INVALID     2
 730 #define WLAN_HT_CAP_MIMO_PS_DISABLED    3
 731
 732 /* Authentication algorithms */
 733 #define WLAN_AUTH_OPEN 0
 734 #define WLAN_AUTH_SHARED_KEY 1
 735 #define WLAN_AUTH_FAST_BSS_TRANSITION 2
 736 #define WLAN_AUTH_LEAP 128
 737
 738 #define WLAN_AUTH_CHALLENGE_LEN 128
 739
 740 #define WLAN_CAPABILITY_ESS             (1<<0)
 741 #define WLAN_CAPABILITY_IBSS            (1<<1)
 742 #define WLAN_CAPABILITY_CF_POLLABLE     (1<<2)
 743 #define WLAN_CAPABILITY_CF_POLL_REQUEST (1<<3)
 744 #define WLAN_CAPABILITY_PRIVACY         (1<<4)
 745 #define WLAN_CAPABILITY_SHORT_PREAMBLE  (1<<5)
 746 #define WLAN_CAPABILITY_PBCC            (1<<6)
 747 #define WLAN_CAPABILITY_CHANNEL_AGILITY (1<<7)
 748
 749 /* 802.11h */
 750 #define WLAN_CAPABILITY_SPECTRUM_MGMT   (1<<8)
 751 #define WLAN_CAPABILITY_QOS             (1<<9)
 752 #define WLAN_CAPABILITY_SHORT_SLOT_TIME (1<<10)
 753 #define WLAN_CAPABILITY_DSSS_OFDM       (1<<13)
 754 /* measurement */
 755 #define IEEE80211_SPCT_MSR_RPRT_MODE_LATE       (1<<0)
 756 #define IEEE80211_SPCT_MSR_RPRT_MODE_INCAPABLE  (1<<1)
 757 #define IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED    (1<<2)
 758
 759 #define IEEE80211_SPCT_MSR_RPRT_TYPE_BASIC      0
 760 #define IEEE80211_SPCT_MSR_RPRT_TYPE_CCA        1
 761 #define IEEE80211_SPCT_MSR_RPRT_TYPE_RPI        2
 762
 763
 764 /* 802.11g ERP information element */
 765 #define WLAN_ERP_NON_ERP_PRESENT (1<<0)
 766 #define WLAN_ERP_USE_PROTECTION (1<<1)
 767 #define WLAN_ERP_BARKER_PREAMBLE (1<<2)
 768
 769 /* WLAN_ERP_BARKER_PREAMBLE values */
 770 enum {
 771         WLAN_ERP_PREAMBLE_SHORT = 0,
 772         WLAN_ERP_PREAMBLE_LONG = 1,
 773 };
 774
 775 /* Status codes */
 776 enum ieee80211_statuscode {
 777         WLAN_STATUS_SUCCESS = 0,
 778         WLAN_STATUS_UNSPECIFIED_FAILURE = 1,
 779         WLAN_STATUS_CAPS_UNSUPPORTED = 10,
 780         WLAN_STATUS_REASSOC_NO_ASSOC = 11,
 781         WLAN_STATUS_ASSOC_DENIED_UNSPEC = 12,
 782         WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG = 13,
 783         WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION = 14,
 784         WLAN_STATUS_CHALLENGE_FAIL = 15,
 785         WLAN_STATUS_AUTH_TIMEOUT = 16,
 786         WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA = 17,
 787         WLAN_STATUS_ASSOC_DENIED_RATES = 18,
 788         /* 802.11b */
 789         WLAN_STATUS_ASSOC_DENIED_NOSHORTPREAMBLE = 19,
 790         WLAN_STATUS_ASSOC_DENIED_NOPBCC = 20,
 791         WLAN_STATUS_ASSOC_DENIED_NOAGILITY = 21,
 792         /* 802.11h */
 793         WLAN_STATUS_ASSOC_DENIED_NOSPECTRUM = 22,
 794         WLAN_STATUS_ASSOC_REJECTED_BAD_POWER = 23,
 795         WLAN_STATUS_ASSOC_REJECTED_BAD_SUPP_CHAN = 24,
 796         /* 802.11g */
 797         WLAN_STATUS_ASSOC_DENIED_NOSHORTTIME = 25,
 798         WLAN_STATUS_ASSOC_DENIED_NODSSSOFDM = 26,
 799         /* 802.11i */
 800         WLAN_STATUS_INVALID_IE = 40,
 801         WLAN_STATUS_INVALID_GROUP_CIPHER = 41,
 802         WLAN_STATUS_INVALID_PAIRWISE_CIPHER = 42,
 803         WLAN_STATUS_INVALID_AKMP = 43,
 804         WLAN_STATUS_UNSUPP_RSN_VERSION = 44,
 805         WLAN_STATUS_INVALID_RSN_IE_CAP = 45,
 806         WLAN_STATUS_CIPHER_SUITE_REJECTED = 46,
 807         /* 802.11e */
 808         WLAN_STATUS_UNSPECIFIED_QOS = 32,
 809         WLAN_STATUS_ASSOC_DENIED_NOBANDWIDTH = 33,
 810         WLAN_STATUS_ASSOC_DENIED_LOWACK = 34,
 811         WLAN_STATUS_ASSOC_DENIED_UNSUPP_QOS = 35,
 812         WLAN_STATUS_REQUEST_DECLINED = 37,
 813         WLAN_STATUS_INVALID_QOS_PARAM = 38,
 814         WLAN_STATUS_CHANGE_TSPEC = 39,
 815         WLAN_STATUS_WAIT_TS_DELAY = 47,
 816         WLAN_STATUS_NO_DIRECT_LINK = 48,
 817         WLAN_STATUS_STA_NOT_PRESENT = 49,
 818         WLAN_STATUS_STA_NOT_QSTA = 50,
 819 };
 820
 821
 822 /* Reason codes */
 823 enum ieee80211_reasoncode {
 824         WLAN_REASON_UNSPECIFIED = 1,
 825         WLAN_REASON_PREV_AUTH_NOT_VALID = 2,
 826         WLAN_REASON_DEAUTH_LEAVING = 3,
 827         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY = 4,
 828         WLAN_REASON_DISASSOC_AP_BUSY = 5,
 829         WLAN_REASON_CLASS2_FRAME_FROM_NONAUTH_STA = 6,
 830         WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA = 7,
 831         WLAN_REASON_DISASSOC_STA_HAS_LEFT = 8,
 832         WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH = 9,
 833         /* 802.11h */
 834         WLAN_REASON_DISASSOC_BAD_POWER = 10,
 835         WLAN_REASON_DISASSOC_BAD_SUPP_CHAN = 11,
 836         /* 802.11i */
 837         WLAN_REASON_INVALID_IE = 13,
 838         WLAN_REASON_MIC_FAILURE = 14,
 839         WLAN_REASON_4WAY_HANDSHAKE_TIMEOUT = 15,
 840         WLAN_REASON_GROUP_KEY_HANDSHAKE_TIMEOUT = 16,
 841         WLAN_REASON_IE_DIFFERENT = 17,
 842         WLAN_REASON_INVALID_GROUP_CIPHER = 18,
 843         WLAN_REASON_INVALID_PAIRWISE_CIPHER = 19,
 844         WLAN_REASON_INVALID_AKMP = 20,
 845         WLAN_REASON_UNSUPP_RSN_VERSION = 21,
 846         WLAN_REASON_INVALID_RSN_IE_CAP = 22,
 847         WLAN_REASON_IEEE8021X_FAILED = 23,
 848         WLAN_REASON_CIPHER_SUITE_REJECTED = 24,
 849         /* 802.11e */
 850         WLAN_REASON_DISASSOC_UNSPECIFIED_QOS = 32,
 851         WLAN_REASON_DISASSOC_QAP_NO_BANDWIDTH = 33,
 852         WLAN_REASON_DISASSOC_LOW_ACK = 34,
 853         WLAN_REASON_DISASSOC_QAP_EXCEED_TXOP = 35,
 854         WLAN_REASON_QSTA_LEAVE_QBSS = 36,
 855         WLAN_REASON_QSTA_NOT_USE = 37,
 856         WLAN_REASON_QSTA_REQUIRE_SETUP = 38,
 857         WLAN_REASON_QSTA_TIMEOUT = 39,
 858         WLAN_REASON_QSTA_CIPHER_NOT_SUPP = 45,
 859 };
 860
 861
 862 /* Information Element IDs */
 863 enum ieee80211_eid {
 864         WLAN_EID_SSID = 0,
 865         WLAN_EID_SUPP_RATES = 1,
 866         WLAN_EID_FH_PARAMS = 2,
 867         WLAN_EID_DS_PARAMS = 3,
 868         WLAN_EID_CF_PARAMS = 4,
 869         WLAN_EID_TIM = 5,
 870         WLAN_EID_IBSS_PARAMS = 6,
 871         WLAN_EID_CHALLENGE = 16,
 872         /* 802.11d */
 873         WLAN_EID_COUNTRY = 7,
 874         WLAN_EID_HP_PARAMS = 8,
 875         WLAN_EID_HP_TABLE = 9,
 876         WLAN_EID_REQUEST = 10,
 877         /* 802.11e */
 878         WLAN_EID_QBSS_LOAD = 11,
 879         WLAN_EID_EDCA_PARAM_SET = 12,
 880         WLAN_EID_TSPEC = 13,
 881         WLAN_EID_TCLAS = 14,
 882         WLAN_EID_SCHEDULE = 15,
 883         WLAN_EID_TS_DELAY = 43,
 884         WLAN_EID_TCLAS_PROCESSING = 44,
 885         WLAN_EID_QOS_CAPA = 46,
 886         /* 802.11s
 887          *
 888          * All mesh EID numbers are pending IEEE 802.11 ANA approval.
 889          * The numbers have been incremented from those suggested in
 890          * 802.11s/D2.0 so that MESH_CONFIG does not conflict with
 891          * EXT_SUPP_RATES.
 892          */
 893         WLAN_EID_MESH_CONFIG = 51,
 894         WLAN_EID_MESH_ID = 52,
 895         WLAN_EID_PEER_LINK = 55,
 896         WLAN_EID_PREQ = 68,
 897         WLAN_EID_PREP = 69,
 898         WLAN_EID_PERR = 70,
 899         /* 802.11h */
 900         WLAN_EID_PWR_CONSTRAINT = 32,
 901         WLAN_EID_PWR_CAPABILITY = 33,
 902         WLAN_EID_TPC_REQUEST = 34,
 903         WLAN_EID_TPC_REPORT = 35,
 904         WLAN_EID_SUPPORTED_CHANNELS = 36,
 905         WLAN_EID_CHANNEL_SWITCH = 37,
 906         WLAN_EID_MEASURE_REQUEST = 38,
 907         WLAN_EID_MEASURE_REPORT = 39,
 908         WLAN_EID_QUIET = 40,
 909         WLAN_EID_IBSS_DFS = 41,
 910         /* 802.11g */
 911         WLAN_EID_ERP_INFO = 42,
 912         WLAN_EID_EXT_SUPP_RATES = 50,
 913         /* 802.11n */
 914         WLAN_EID_HT_CAPABILITY = 45,
 915         WLAN_EID_HT_EXTRA_INFO = 61,
 916         /* 802.11i */
 917         WLAN_EID_RSN = 48,
 918         WLAN_EID_WPA = 221,
 919         WLAN_EID_GENERIC = 221,
 920         WLAN_EID_VENDOR_SPECIFIC = 221,
 921         WLAN_EID_QOS_PARAMETER = 222
 922 };
 923
 924 /* Action category code */
 925 enum ieee80211_category {
 926         WLAN_CATEGORY_SPECTRUM_MGMT = 0,
 927         WLAN_CATEGORY_QOS = 1,
 928         WLAN_CATEGORY_DLS = 2,
 929         WLAN_CATEGORY_BACK = 3,
 930         WLAN_CATEGORY_WMM = 17,
 931 };
 932
 933 /* SPECTRUM_MGMT action code */
 934 enum ieee80211_spectrum_mgmt_actioncode {
 935         WLAN_ACTION_SPCT_MSR_REQ = 0,
 936         WLAN_ACTION_SPCT_MSR_RPRT = 1,
 937         WLAN_ACTION_SPCT_TPC_REQ = 2,
 938         WLAN_ACTION_SPCT_TPC_RPRT = 3,
 939         WLAN_ACTION_SPCT_CHL_SWITCH = 4,
 940 };
 941
 942 /* BACK action code */
 943 enum ieee80211_back_actioncode {
 944         WLAN_ACTION_ADDBA_REQ = 0,
 945         WLAN_ACTION_ADDBA_RESP = 1,
 946         WLAN_ACTION_DELBA = 2,
 947 };
 948
 949 /* BACK (block-ack) parties */
 950 enum ieee80211_back_parties {
 951         WLAN_BACK_RECIPIENT = 0,
 952         WLAN_BACK_INITIATOR = 1,
 953         WLAN_BACK_TIMER = 2,
 954 };
 955
 956 /* A-MSDU 802.11n */
 957 #define IEEE80211_QOS_CONTROL_A_MSDU_PRESENT 0x0080
 958
 959 /* cipher suite selectors */
 960 #define WLAN_CIPHER_SUITE_USE_GROUP     0x000FAC00
 961 #define WLAN_CIPHER_SUITE_WEP40         0x000FAC01
 962 #define WLAN_CIPHER_SUITE_TKIP          0x000FAC02
 963 /* reserved:                            0x000FAC03 */
 964 #define WLAN_CIPHER_SUITE_CCMP          0x000FAC04
 965 #define WLAN_CIPHER_SUITE_WEP104        0x000FAC05
 966
 967 #define WLAN_MAX_KEY_LEN                32
 968
 969 /**
 970  * ieee80211_get_qos_ctl - get pointer to qos control bytes
 971  * @hdr: the frame
 972  *
 973  * The qos ctrl bytes come after the frame_control, duration, seq_num
 974  * and 3 or 4 addresses of length ETH_ALEN.
 975  * 3 addr: 2 + 2 + 2 + 3*6 = 24
 976  * 4 addr: 2 + 2 + 2 + 4*6 = 30
 977  */
 978 static inline u8 *ieee80211_get_qos_ctl(struct ieee80211_hdr *hdr)
 979 {
 980         if (ieee80211_has_a4(hdr->frame_control))
 981                 return (u8 *)hdr + 30;
 982         else
 983                 return (u8 *)hdr + 24;
 984 }
 985
 986 /**
 987  * ieee80211_get_SA - get pointer to SA
 988  * @hdr: the frame
 989  *
 990  * Given an 802.11 frame, this function returns the offset
 991  * to the source address (SA). It does not verify that the
 992  * header is long enough to contain the address, and the
 993  * header must be long enough to contain the frame control
 994  * field.
 995  */
 996 static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
 997 {
 998         if (ieee80211_has_a4(hdr->frame_control))
 999                 return hdr->addr4;
1000         if (ieee80211_has_fromds(hdr->frame_control))
1001                 return hdr->addr3;
1002         return hdr->addr2;
1003 }
1004
1005 /**
1006  * ieee80211_get_DA - get pointer to DA
1007  * @hdr: the frame
1008  *
1009  * Given an 802.11 frame, this function returns the offset
1010  * to the destination address (DA). It does not verify that
1011  * the header is long enough to contain the address, and the
1012  * header must be long enough to contain the frame control
1013  * field.
1014  */
1015 static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
1016 {
1017         if (ieee80211_has_tods(hdr->frame_control))
1018                 return hdr->addr3;
1019         else
1020                 return hdr->addr1;
1021 }
1022
1023 #endif /* IEEE80211_H */