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   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_PSPOLL          0x00A0
  58 #define IEEE80211_STYPE_RTS             0x00B0
  59 #define IEEE80211_STYPE_CTS             0x00C0
  60 #define IEEE80211_STYPE_ACK             0x00D0
  61 #define IEEE80211_STYPE_CFEND           0x00E0
  62 #define IEEE80211_STYPE_CFENDACK        0x00F0
  63
  64 /* data */
  65 #define IEEE80211_STYPE_DATA                    0x0000
  66 #define IEEE80211_STYPE_DATA_CFACK              0x0010
  67 #define IEEE80211_STYPE_DATA_CFPOLL             0x0020
  68 #define IEEE80211_STYPE_DATA_CFACKPOLL          0x0030
  69 #define IEEE80211_STYPE_NULLFUNC                0x0040
  70 #define IEEE80211_STYPE_CFACK                   0x0050
  71 #define IEEE80211_STYPE_CFPOLL                  0x0060
  72 #define IEEE80211_STYPE_CFACKPOLL               0x0070
  73 #define IEEE80211_STYPE_QOS_DATA                0x0080
  74 #define IEEE80211_STYPE_QOS_DATA_CFACK          0x0090
  75 #define IEEE80211_STYPE_QOS_DATA_CFPOLL         0x00A0
  76 #define IEEE80211_STYPE_QOS_DATA_CFACKPOLL      0x00B0
  77 #define IEEE80211_STYPE_QOS_NULLFUNC            0x00C0
  78 #define IEEE80211_STYPE_QOS_CFACK               0x00D0
  79 #define IEEE80211_STYPE_QOS_CFPOLL              0x00E0
  80 #define IEEE80211_STYPE_QOS_CFACKPOLL           0x00F0
  81
  82
  83 /* miscellaneous IEEE 802.11 constants */
  84 #define IEEE80211_MAX_FRAG_THRESHOLD    2346
  85 #define IEEE80211_MAX_RTS_THRESHOLD     2347
  86 #define IEEE80211_MAX_AID               2007
  87 #define IEEE80211_MAX_TIM_LEN           251
  88 #define IEEE80211_MAX_DATA_LEN          2304
  89 /* Maximum size for the MA-UNITDATA primitive, 802.11 standard section
  90    6.2.1.1.2.
  91
  92    The figure in section 7.1.2 suggests a body size of up to 2312
  93    bytes is allowed, which is a bit confusing, I suspect this
  94    represents the 2304 bytes of real data, plus a possible 8 bytes of
  95    WEP IV and ICV. (this interpretation suggested by Ramiro Barreiro) */
  96
  97 #define IEEE80211_MAX_SSID_LEN          32
  98
  99 struct ieee80211_hdr {
 100         __le16 frame_control;
 101         __le16 duration_id;
 102         u8 addr1[6];
 103         u8 addr2[6];
 104         u8 addr3[6];
 105         __le16 seq_ctrl;
 106         u8 addr4[6];
 107 } __attribute__ ((packed));
 108
 109
 110 struct ieee80211_mgmt {
 111         __le16 frame_control;
 112         __le16 duration;
 113         u8 da[6];
 114         u8 sa[6];
 115         u8 bssid[6];
 116         __le16 seq_ctrl;
 117         union {
 118                 struct {
 119                         __le16 auth_alg;
 120                         __le16 auth_transaction;
 121                         __le16 status_code;
 122                         /* possibly followed by Challenge text */
 123                         u8 variable[0];
 124                 } __attribute__ ((packed)) auth;
 125                 struct {
 126                         __le16 reason_code;
 127                 } __attribute__ ((packed)) deauth;
 128                 struct {
 129                         __le16 capab_info;
 130                         __le16 listen_interval;
 131                         /* followed by SSID and Supported rates */
 132                         u8 variable[0];
 133                 } __attribute__ ((packed)) assoc_req;
 134                 struct {
 135                         __le16 capab_info;
 136                         __le16 status_code;
 137                         __le16 aid;
 138                         /* followed by Supported rates */
 139                         u8 variable[0];
 140                 } __attribute__ ((packed)) assoc_resp, reassoc_resp;
 141                 struct {
 142                         __le16 capab_info;
 143                         __le16 listen_interval;
 144                         u8 current_ap[6];
 145                         /* followed by SSID and Supported rates */
 146                         u8 variable[0];
 147                 } __attribute__ ((packed)) reassoc_req;
 148                 struct {
 149                         __le16 reason_code;
 150                 } __attribute__ ((packed)) disassoc;
 151                 struct {
 152                         __le64 timestamp;
 153                         __le16 beacon_int;
 154                         __le16 capab_info;
 155                         /* followed by some of SSID, Supported rates,
 156                          * FH Params, DS Params, CF Params, IBSS Params, TIM */
 157                         u8 variable[0];
 158                 } __attribute__ ((packed)) beacon;
 159                 struct {
 160                         /* only variable items: SSID, Supported rates */
 161                         u8 variable[0];
 162                 } __attribute__ ((packed)) probe_req;
 163                 struct {
 164                         __le64 timestamp;
 165                         __le16 beacon_int;
 166                         __le16 capab_info;
 167                         /* followed by some of SSID, Supported rates,
 168                          * FH Params, DS Params, CF Params, IBSS Params */
 169                         u8 variable[0];
 170                 } __attribute__ ((packed)) probe_resp;
 171                 struct {
 172                         u8 category;
 173                         union {
 174                                 struct {
 175                                         u8 action_code;
 176                                         u8 dialog_token;
 177                                         u8 status_code;
 178                                         u8 variable[0];
 179                                 } __attribute__ ((packed)) wme_action;
 180                                 struct{
 181                                         u8 action_code;
 182                                         u8 element_id;
 183                                         u8 length;
 184                                         u8 switch_mode;
 185                                         u8 new_chan;
 186                                         u8 switch_count;
 187                                 } __attribute__((packed)) chan_switch;
 188                         } u;
 189                 } __attribute__ ((packed)) action;
 190         } u;
 191 } __attribute__ ((packed));
 192
 193
 194 /* Control frames */
 195 struct ieee80211_rts {
 196         __le16 frame_control;
 197         __le16 duration;
 198         u8 ra[6];
 199         u8 ta[6];
 200 } __attribute__ ((packed));
 201
 202 struct ieee80211_cts {
 203         __le16 frame_control;
 204         __le16 duration;
 205         u8 ra[6];
 206 } __attribute__ ((packed));
 207
 208
 209 /* Authentication algorithms */
 210 #define WLAN_AUTH_OPEN 0
 211 #define WLAN_AUTH_SHARED_KEY 1
 212 #define WLAN_AUTH_FAST_BSS_TRANSITION 2
 213 #define WLAN_AUTH_LEAP 128
 214
 215 #define WLAN_AUTH_CHALLENGE_LEN 128
 216
 217 #define WLAN_CAPABILITY_ESS             (1<<0)
 218 #define WLAN_CAPABILITY_IBSS            (1<<1)
 219 #define WLAN_CAPABILITY_CF_POLLABLE     (1<<2)
 220 #define WLAN_CAPABILITY_CF_POLL_REQUEST (1<<3)
 221 #define WLAN_CAPABILITY_PRIVACY         (1<<4)
 222 #define WLAN_CAPABILITY_SHORT_PREAMBLE  (1<<5)
 223 #define WLAN_CAPABILITY_PBCC            (1<<6)
 224 #define WLAN_CAPABILITY_CHANNEL_AGILITY (1<<7)
 225 /* 802.11h */
 226 #define WLAN_CAPABILITY_SPECTRUM_MGMT   (1<<8)
 227 #define WLAN_CAPABILITY_QOS             (1<<9)
 228 #define WLAN_CAPABILITY_SHORT_SLOT_TIME (1<<10)
 229 #define WLAN_CAPABILITY_DSSS_OFDM       (1<<13)
 230
 231 /* 802.11g ERP information element */
 232 #define WLAN_ERP_NON_ERP_PRESENT (1<<0)
 233 #define WLAN_ERP_USE_PROTECTION (1<<1)
 234 #define WLAN_ERP_BARKER_PREAMBLE (1<<2)
 235
 236 /* WLAN_ERP_BARKER_PREAMBLE values */
 237 enum {
 238         WLAN_ERP_PREAMBLE_SHORT = 0,
 239         WLAN_ERP_PREAMBLE_LONG = 1,
 240 };
 241
 242 /* Status codes */
 243 enum ieee80211_statuscode {
 244         WLAN_STATUS_SUCCESS = 0,
 245         WLAN_STATUS_UNSPECIFIED_FAILURE = 1,
 246         WLAN_STATUS_CAPS_UNSUPPORTED = 10,
 247         WLAN_STATUS_REASSOC_NO_ASSOC = 11,
 248         WLAN_STATUS_ASSOC_DENIED_UNSPEC = 12,
 249         WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG = 13,
 250         WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION = 14,
 251         WLAN_STATUS_CHALLENGE_FAIL = 15,
 252         WLAN_STATUS_AUTH_TIMEOUT = 16,
 253         WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA = 17,
 254         WLAN_STATUS_ASSOC_DENIED_RATES = 18,
 255         /* 802.11b */
 256         WLAN_STATUS_ASSOC_DENIED_NOSHORTPREAMBLE = 19,
 257         WLAN_STATUS_ASSOC_DENIED_NOPBCC = 20,
 258         WLAN_STATUS_ASSOC_DENIED_NOAGILITY = 21,
 259         /* 802.11h */
 260         WLAN_STATUS_ASSOC_DENIED_NOSPECTRUM = 22,
 261         WLAN_STATUS_ASSOC_REJECTED_BAD_POWER = 23,
 262         WLAN_STATUS_ASSOC_REJECTED_BAD_SUPP_CHAN = 24,
 263         /* 802.11g */
 264         WLAN_STATUS_ASSOC_DENIED_NOSHORTTIME = 25,
 265         WLAN_STATUS_ASSOC_DENIED_NODSSSOFDM = 26,
 266         /* 802.11i */
 267         WLAN_STATUS_INVALID_IE = 40,
 268         WLAN_STATUS_INVALID_GROUP_CIPHER = 41,
 269         WLAN_STATUS_INVALID_PAIRWISE_CIPHER = 42,
 270         WLAN_STATUS_INVALID_AKMP = 43,
 271         WLAN_STATUS_UNSUPP_RSN_VERSION = 44,
 272         WLAN_STATUS_INVALID_RSN_IE_CAP = 45,
 273         WLAN_STATUS_CIPHER_SUITE_REJECTED = 46,
 274 };
 275
 276
 277 /* Reason codes */
 278 enum ieee80211_reasoncode {
 279         WLAN_REASON_UNSPECIFIED = 1,
 280         WLAN_REASON_PREV_AUTH_NOT_VALID = 2,
 281         WLAN_REASON_DEAUTH_LEAVING = 3,
 282         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY = 4,
 283         WLAN_REASON_DISASSOC_AP_BUSY = 5,
 284         WLAN_REASON_CLASS2_FRAME_FROM_NONAUTH_STA = 6,
 285         WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA = 7,
 286         WLAN_REASON_DISASSOC_STA_HAS_LEFT = 8,
 287         WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH = 9,
 288         /* 802.11h */
 289         WLAN_REASON_DISASSOC_BAD_POWER = 10,
 290         WLAN_REASON_DISASSOC_BAD_SUPP_CHAN = 11,
 291         /* 802.11i */
 292         WLAN_REASON_INVALID_IE = 13,
 293         WLAN_REASON_MIC_FAILURE = 14,
 294         WLAN_REASON_4WAY_HANDSHAKE_TIMEOUT = 15,
 295         WLAN_REASON_GROUP_KEY_HANDSHAKE_TIMEOUT = 16,
 296         WLAN_REASON_IE_DIFFERENT = 17,
 297         WLAN_REASON_INVALID_GROUP_CIPHER = 18,
 298         WLAN_REASON_INVALID_PAIRWISE_CIPHER = 19,
 299         WLAN_REASON_INVALID_AKMP = 20,
 300         WLAN_REASON_UNSUPP_RSN_VERSION = 21,
 301         WLAN_REASON_INVALID_RSN_IE_CAP = 22,
 302         WLAN_REASON_IEEE8021X_FAILED = 23,
 303         WLAN_REASON_CIPHER_SUITE_REJECTED = 24,
 304 };
 305
 306
 307 /* Information Element IDs */
 308 enum ieee80211_eid {
 309         WLAN_EID_SSID = 0,
 310         WLAN_EID_SUPP_RATES = 1,
 311         WLAN_EID_FH_PARAMS = 2,
 312         WLAN_EID_DS_PARAMS = 3,
 313         WLAN_EID_CF_PARAMS = 4,
 314         WLAN_EID_TIM = 5,
 315         WLAN_EID_IBSS_PARAMS = 6,
 316         WLAN_EID_CHALLENGE = 16,
 317         /* 802.11d */
 318         WLAN_EID_COUNTRY = 7,
 319         WLAN_EID_HP_PARAMS = 8,
 320         WLAN_EID_HP_TABLE = 9,
 321         WLAN_EID_REQUEST = 10,
 322         /* 802.11h */
 323         WLAN_EID_PWR_CONSTRAINT = 32,
 324         WLAN_EID_PWR_CAPABILITY = 33,
 325         WLAN_EID_TPC_REQUEST = 34,
 326         WLAN_EID_TPC_REPORT = 35,
 327         WLAN_EID_SUPPORTED_CHANNELS = 36,
 328         WLAN_EID_CHANNEL_SWITCH = 37,
 329         WLAN_EID_MEASURE_REQUEST = 38,
 330         WLAN_EID_MEASURE_REPORT = 39,
 331         WLAN_EID_QUIET = 40,
 332         WLAN_EID_IBSS_DFS = 41,
 333         /* 802.11g */
 334         WLAN_EID_ERP_INFO = 42,
 335         WLAN_EID_EXT_SUPP_RATES = 50,
 336         /* 802.11i */
 337         WLAN_EID_RSN = 48,
 338         WLAN_EID_WPA = 221,
 339         WLAN_EID_GENERIC = 221,
 340         WLAN_EID_VENDOR_SPECIFIC = 221,
 341         WLAN_EID_QOS_PARAMETER = 222
 342 };
 343
 344 /* cipher suite selectors */
 345 #define WLAN_CIPHER_SUITE_USE_GROUP     0x000FAC00
 346 #define WLAN_CIPHER_SUITE_WEP40         0x000FAC01
 347 #define WLAN_CIPHER_SUITE_TKIP          0x000FAC02
 348 /* reserved:                            0x000FAC03 */
 349 #define WLAN_CIPHER_SUITE_CCMP          0x000FAC04
 350 #define WLAN_CIPHER_SUITE_WEP104        0x000FAC05
 351
 352 #define WLAN_MAX_KEY_LEN                32
 353
 354 /**
 355  * ieee80211_get_SA - get pointer to SA
 356  *
 357  * Given an 802.11 frame, this function returns the offset
 358  * to the source address (SA). It does not verify that the
 359  * header is long enough to contain the address, and the
 360  * header must be long enough to contain the frame control
 361  * field.
 362  *
 363  * @hdr: the frame
 364  */
 365 static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
 366 {
 367         u8 *raw = (u8 *) hdr;
 368         u8 tofrom = (*(raw+1)) & 3; /* get the TODS and FROMDS bits */
 369
 370         switch (tofrom) {
 371                 case 2:
 372                         return hdr->addr3;
 373                 case 3:
 374                         return hdr->addr4;
 375         }
 376         return hdr->addr2;
 377 }
 378
 379 /**
 380  * ieee80211_get_DA - get pointer to DA
 381  *
 382  * Given an 802.11 frame, this function returns the offset
 383  * to the destination address (DA). It does not verify that
 384  * the header is long enough to contain the address, and the
 385  * header must be long enough to contain the frame control
 386  * field.
 387  *
 388  * @hdr: the frame
 389  */
 390 static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
 391 {
 392         u8 *raw = (u8 *) hdr;
 393         u8 to_ds = (*(raw+1)) & 1; /* get the TODS bit */
 394
 395         if (to_ds)
 396                 return hdr->addr3;
 397         return hdr->addr1;
 398 }
 399
 400 /**
 401  * ieee80211_get_morefrag - determine whether the MOREFRAGS bit is set
 402  *
 403  * This function determines whether the "more fragments" bit is set
 404  * in the frame.
 405  *
 406  * @hdr: the frame
 407  */
 408 static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr)
 409 {
 410         return (le16_to_cpu(hdr->frame_control) &
 411                 IEEE80211_FCTL_MOREFRAGS) != 0;
 412 }
 413
 414 #endif /* IEEE80211_H */