The Tcpdump Group git mirrors - tcpdump/blob - ieee802_11.h

   1 /* @(#) $Header: /tcpdump/master/tcpdump/ieee802_11.h,v 1.12 2007-07-22 19:59:06 guy Exp $ (LBL) */
   2 /*
   3  * Copyright (c) 2001
   4  *      Fortress Technologies
   5  *      Charlie Lenahan ( clenahan@fortresstech.com )
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  */
  23
  24 /* Lengths of 802.11 header components. */
  25 #define IEEE802_11_FC_LEN               2
  26 #define IEEE802_11_DUR_LEN              2
  27 #define IEEE802_11_DA_LEN               6
  28 #define IEEE802_11_SA_LEN               6
  29 #define IEEE802_11_BSSID_LEN            6
  30 #define IEEE802_11_RA_LEN               6
  31 #define IEEE802_11_TA_LEN               6
  32 #define IEEE802_11_SEQ_LEN              2
  33 #define IEEE802_11_IV_LEN               3
  34 #define IEEE802_11_KID_LEN              1
  35
  36 /* Frame check sequence length. */
  37 #define IEEE802_11_FCS_LEN              4
  38
  39 /* Lengths of beacon components. */
  40 #define IEEE802_11_TSTAMP_LEN           8
  41 #define IEEE802_11_BCNINT_LEN           2
  42 #define IEEE802_11_CAPINFO_LEN          2
  43 #define IEEE802_11_LISTENINT_LEN        2
  44
  45 #define IEEE802_11_AID_LEN              2
  46 #define IEEE802_11_STATUS_LEN           2
  47 #define IEEE802_11_REASON_LEN           2
  48
  49 /* Length of previous AP in reassocation frame */
  50 #define IEEE802_11_AP_LEN               6
  51
  52 #define T_MGMT 0x0  /* management */
  53 #define T_CTRL 0x1  /* control */
  54 #define T_DATA 0x2 /* data */
  55 #define T_RESV 0x3  /* reserved */
  56
  57 #define ST_ASSOC_REQUEST        0x0
  58 #define ST_ASSOC_RESPONSE       0x1
  59 #define ST_REASSOC_REQUEST      0x2
  60 #define ST_REASSOC_RESPONSE     0x3
  61 #define ST_PROBE_REQUEST        0x4
  62 #define ST_PROBE_RESPONSE       0x5
  63 /* RESERVED                     0x6  */
  64 /* RESERVED                     0x7  */
  65 #define ST_BEACON               0x8
  66 #define ST_ATIM                 0x9
  67 #define ST_DISASSOC             0xA
  68 #define ST_AUTH                 0xB
  69 #define ST_DEAUTH               0xC
  70 /* RESERVED                     0xD  */
  71 /* RESERVED                     0xE  */
  72 /* RESERVED                     0xF  */
  73
  74
  75 #define CTRL_CONTROL_WRAPPER    0x7
  76 #define CTRL_BLOCK_ACK_REQ      0x8
  77 #define CTRL_BLOCK_ACK          0x9
  78 #define CTRL_PS_POLL            0xA
  79 #define CTRL_RTS                0xB
  80 #define CTRL_CTS                0xC
  81 #define CTRL_ACK                0xD
  82 #define CTRL_CF_END             0xE
  83 #define CTRL_END_ACK            0xF
  84
  85 #define DATA_DATA                       0x0
  86 #define DATA_DATA_CF_ACK                0x1
  87 #define DATA_DATA_CF_POLL               0x2
  88 #define DATA_DATA_CF_ACK_POLL           0x3
  89 #define DATA_NODATA                     0x4
  90 #define DATA_NODATA_CF_ACK              0x5
  91 #define DATA_NODATA_CF_POLL             0x6
  92 #define DATA_NODATA_CF_ACK_POLL         0x7
  93
  94 #define DATA_QOS_DATA                   0x8
  95 #define DATA_QOS_DATA_CF_ACK            0x9
  96 #define DATA_QOS_DATA_CF_POLL           0xA
  97 #define DATA_QOS_DATA_CF_ACK_POLL       0xB
  98 #define DATA_QOS_NODATA                 0xC
  99 #define DATA_QOS_CF_POLL_NODATA         0xE
 100 #define DATA_QOS_CF_ACK_POLL_NODATA     0xF
 101
 102 /*
 103  * The subtype field of a data frame is, in effect, composed of 4 flag
 104  * bits - CF-Ack, CF-Poll, Null (means the frame doesn't actually have
 105  * any data), and QoS.
 106  */
 107 #define DATA_FRAME_IS_CF_ACK(x)         ((x) & 0x01)
 108 #define DATA_FRAME_IS_CF_POLL(x)        ((x) & 0x02)
 109 #define DATA_FRAME_IS_NULL(x)           ((x) & 0x04)
 110 #define DATA_FRAME_IS_QOS(x)            ((x) & 0x08)
 111
 112 /*
 113  * Bits in the frame control field.
 114  */
 115 #define FC_VERSION(fc)          ((fc) & 0x3)
 116 #define FC_TYPE(fc)             (((fc) >> 2) & 0x3)
 117 #define FC_SUBTYPE(fc)          (((fc) >> 4) & 0xF)
 118 #define FC_TO_DS(fc)            ((fc) & 0x0100)
 119 #define FC_FROM_DS(fc)          ((fc) & 0x0200)
 120 #define FC_MORE_FLAG(fc)        ((fc) & 0x0400)
 121 #define FC_RETRY(fc)            ((fc) & 0x0800)
 122 #define FC_POWER_MGMT(fc)       ((fc) & 0x1000)
 123 #define FC_MORE_DATA(fc)        ((fc) & 0x2000)
 124 #define FC_WEP(fc)              ((fc) & 0x4000)
 125 #define FC_ORDER(fc)            ((fc) & 0x8000)
 126
 127 struct mgmt_header_t {
 128         u_int16_t       fc;
 129         u_int16_t       duration;
 130         u_int8_t        da[6];
 131         u_int8_t        sa[6];
 132         u_int8_t        bssid[6];
 133         u_int16_t       seq_ctrl;
 134 };
 135
 136 #define MGMT_HDRLEN     (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
 137                          IEEE802_11_DA_LEN+IEEE802_11_SA_LEN+\
 138                          IEEE802_11_BSSID_LEN+IEEE802_11_SEQ_LEN)
 139
 140 #define CAPABILITY_ESS(cap)     ((cap) & 0x0001)
 141 #define CAPABILITY_IBSS(cap)    ((cap) & 0x0002)
 142 #define CAPABILITY_CFP(cap)     ((cap) & 0x0004)
 143 #define CAPABILITY_CFP_REQ(cap) ((cap) & 0x0008)
 144 #define CAPABILITY_PRIVACY(cap) ((cap) & 0x0010)
 145
 146 typedef enum {
 147         NOT_PRESENT,
 148         PRESENT,
 149         TRUNCATED
 150 } elem_status_t;
 151
 152 struct ssid_t {
 153         u_int8_t        element_id;
 154         u_int8_t        length;
 155         u_char          ssid[33];  /* 32 + 1 for null */
 156 };
 157
 158 struct rates_t {
 159         u_int8_t        element_id;
 160         u_int8_t        length;
 161         u_int8_t        rate[16];
 162 };
 163
 164 struct challenge_t {
 165         u_int8_t        element_id;
 166         u_int8_t        length;
 167         u_int8_t        text[254]; /* 1-253 + 1 for null */
 168 };
 169
 170 struct fh_t {
 171         u_int8_t        element_id;
 172         u_int8_t        length;
 173         u_int16_t       dwell_time;
 174         u_int8_t        hop_set;
 175         u_int8_t        hop_pattern;
 176         u_int8_t        hop_index;
 177 };
 178
 179 struct ds_t {
 180         u_int8_t        element_id;
 181         u_int8_t        length;
 182         u_int8_t        channel;
 183 };
 184
 185 struct cf_t {
 186         u_int8_t        element_id;
 187         u_int8_t        length;
 188         u_int8_t        count;
 189         u_int8_t        period;
 190         u_int16_t       max_duration;
 191         u_int16_t       dur_remaing;
 192 };
 193
 194 struct tim_t {
 195         u_int8_t        element_id;
 196         u_int8_t        length;
 197         u_int8_t        count;
 198         u_int8_t        period;
 199         u_int8_t        bitmap_control;
 200         u_int8_t        bitmap[251];
 201 };
 202
 203 #define E_SSID          0
 204 #define E_RATES         1
 205 #define E_FH            2
 206 #define E_DS            3
 207 #define E_CF            4
 208 #define E_TIM           5
 209 #define E_IBSS          6
 210 /* reserved             7 */
 211 /* reserved             8 */
 212 /* reserved             9 */
 213 /* reserved             10 */
 214 /* reserved             11 */
 215 /* reserved             12 */
 216 /* reserved             13 */
 217 /* reserved             14 */
 218 /* reserved             15 */
 219 /* reserved             16 */
 220
 221 #define E_CHALLENGE     16
 222 /* reserved             17 */
 223 /* reserved             18 */
 224 /* reserved             19 */
 225 /* reserved             16 */
 226 /* reserved             16 */
 227
 228
 229 struct mgmt_body_t {
 230         u_int8_t        timestamp[IEEE802_11_TSTAMP_LEN];
 231         u_int16_t       beacon_interval;
 232         u_int16_t       listen_interval;
 233         u_int16_t       status_code;
 234         u_int16_t       aid;
 235         u_char          ap[IEEE802_11_AP_LEN];
 236         u_int16_t       reason_code;
 237         u_int16_t       auth_alg;
 238         u_int16_t       auth_trans_seq_num;
 239         elem_status_t   challenge_status;
 240         struct challenge_t  challenge;
 241         u_int16_t       capability_info;
 242         elem_status_t   ssid_status;
 243         struct ssid_t   ssid;
 244         elem_status_t   rates_status;
 245         struct rates_t  rates;
 246         elem_status_t   ds_status;
 247         struct ds_t     ds;
 248         elem_status_t   cf_status;
 249         struct cf_t     cf;
 250         elem_status_t   fh_status;
 251         struct fh_t     fh;
 252         elem_status_t   tim_status;
 253         struct tim_t    tim;
 254 };
 255
 256 struct ctrl_rts_t {
 257         u_int16_t       fc;
 258         u_int16_t       duration;
 259         u_int8_t        ra[6];
 260         u_int8_t        ta[6];
 261         u_int8_t        fcs[4];
 262 };
 263
 264 #define CTRL_RTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
 265                          IEEE802_11_RA_LEN+IEEE802_11_TA_LEN)
 266
 267 struct ctrl_cts_t {
 268         u_int16_t       fc;
 269         u_int16_t       duration;
 270         u_int8_t        ra[6];
 271         u_int8_t        fcs[4];
 272 };
 273
 274 #define CTRL_CTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)
 275
 276 struct ctrl_ack_t {
 277         u_int16_t       fc;
 278         u_int16_t       duration;
 279         u_int8_t        ra[6];
 280         u_int8_t        fcs[4];
 281 };
 282
 283 #define CTRL_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)
 284
 285 struct ctrl_ps_poll_t {
 286         u_int16_t       fc;
 287         u_int16_t       aid;
 288         u_int8_t        bssid[6];
 289         u_int8_t        ta[6];
 290         u_int8_t        fcs[4];
 291 };
 292
 293 #define CTRL_PS_POLL_HDRLEN     (IEEE802_11_FC_LEN+IEEE802_11_AID_LEN+\
 294                                  IEEE802_11_BSSID_LEN+IEEE802_11_TA_LEN)
 295
 296 struct ctrl_end_t {
 297         u_int16_t       fc;
 298         u_int16_t       duration;
 299         u_int8_t        ra[6];
 300         u_int8_t        bssid[6];
 301         u_int8_t        fcs[4];
 302 };
 303
 304 #define CTRL_END_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
 305                          IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN)
 306
 307 struct ctrl_end_ack_t {
 308         u_int16_t       fc;
 309         u_int16_t       duration;
 310         u_int8_t        ra[6];
 311         u_int8_t        bssid[6];
 312         u_int8_t        fcs[4];
 313 };
 314
 315 #define CTRL_END_ACK_HDRLEN     (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
 316                                  IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN)
 317
 318 struct ctrl_block_ack_req_t {
 319         u_int16_t       fc;
 320         u_int16_t       duration;
 321         u_int8_t        ra[6];
 322         u_int8_t        ta[6];
 323         u_int16_t       bar_control;
 324 };
 325
 326 #define CTRL_BLOCK_ACK_REQ_HDRLEN       (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
 327                                          IEEE802_11_RA_LEN+IEEE802_11_TA_LEN)
 328
 329 struct ctrl_block_ack_t {
 330         u_int16_t       fc;
 331         u_int16_t       duration;
 332         u_int8_t        ra[6];
 333         u_int8_t        ta[6];
 334         u_int16_t       ba_control;
 335 };
 336
 337 #define CTRL_BLOCK_ACK_HDRLEN   (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
 338                                  IEEE802_11_RA_LEN+IEEE802_11_TA_LEN)
 339
 340 #define IV_IV(iv)       ((iv) & 0xFFFFFF)
 341 #define IV_PAD(iv)      (((iv) >> 24) & 0x3F)
 342 #define IV_KEYID(iv)    (((iv) >> 30) & 0x03)