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

   1 /* @(#) $Header: /tcpdump/master/tcpdump/ieee802_11.h,v 1.4 2002-06-11 17:08:38 itojun 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 #define IEEE802_11_FC_LEN       2
  25
  26 #define T_MGMT 0x0  /* management */
  27 #define T_CTRL 0x1  /* control */
  28 #define T_DATA 0x2 /* data */
  29 #define T_RESV 0x3  /* reserved */
  30
  31 #define ST_ASSOC_REQUEST        0x0
  32 #define ST_ASSOC_RESPONSE       0x1
  33 #define ST_REASSOC_REQUEST      0x2
  34 #define ST_REASSOC_RESPONSE     0x3
  35 #define ST_PROBE_REQUEST        0x4
  36 #define ST_PROBE_RESPONSE       0x5
  37 /* RESERVED                     0x6  */
  38 /* RESERVED                     0x7  */
  39 #define ST_BEACON               0x8
  40 #define ST_ATIM                 0x9
  41 #define ST_DISASSOC             0xA
  42 #define ST_AUTH                 0xB
  43 #define ST_DEAUTH               0xC
  44 /* RESERVED                     0xD  */
  45 /* RESERVED                     0xE  */
  46 /* RESERVED                     0xF  */
  47
  48
  49 #define CTRL_PS_POLL    0xA
  50 #define CTRL_RTS        0xB
  51 #define CTRL_CTS        0xC
  52 #define CTRL_ACK        0xD
  53 #define CTRL_CF_END     0xE
  54 #define CTRL_END_ACK    0xF
  55
  56 /*
  57  * Bits in the frame control field.
  58  */
  59 #define FC_VERSION(fc)          ((fc) & 0x3)
  60 #define FC_TYPE(fc)             (((fc) >> 2) & 0x3)
  61 #define FC_SUBTYPE(fc)          (((fc) >> 4) & 0xF)
  62 #define FC_TO_DS(fc)            ((fc) & 0x0100)
  63 #define FC_FROM_DS(fc)          ((fc) & 0x0200)
  64 #define FC_MORE_FLAG(fc)        ((fc) & 0x0400)
  65 #define FC_RETRY(fc)            ((fc) & 0x0800)
  66 #define FC_POWER_MGMT(fc)       ((fc) & 0x1000)
  67 #define FC_MORE_DATA(fc)        ((fc) & 0x2000)
  68 #define FC_WEP(fc)              ((fc) & 0x4000)
  69 #define FC_ORDER(fc)            ((fc) & 0x8000)
  70
  71 struct mgmt_header_t {
  72         u_int16_t       fc;
  73         u_int16_t       duration;
  74         u_int8_t        da[6];
  75         u_int8_t        sa[6];
  76         u_int8_t        bssid[6];
  77         u_int16_t       seq_ctrl;
  78 };
  79
  80 #define MGMT_HEADER_LEN (2+2+6+6+6+2)
  81
  82 #define CAPABILITY_ESS(cap)     ((cap) & 0x0001)
  83 #define CAPABILITY_IBSS(cap)    ((cap) & 0x0002)
  84 #define CAPABILITY_CFP(cap)     ((cap) & 0x0004)
  85 #define CAPABILITY_CFP_REQ(cap) ((cap) & 0x0008)
  86 #define CAPABILITY_PRIVACY(cap) ((cap) & 0x0010)
  87
  88 struct ssid_t {
  89         u_int8_t        element_id;
  90         u_int8_t        length;
  91         u_char          ssid[33];  /* 32 + 1 for null */
  92 } ;
  93
  94 struct rates_t {
  95         u_int8_t        element_id;
  96         u_int8_t        length;
  97         u_int8_t        rate[8];
  98 };
  99
 100 struct challenge_t {
 101         u_int8_t        element_id;
 102         u_int8_t        length;
 103         u_int8_t        text[254]; /* 1-253 + 1 for null */
 104 };
 105 struct fh_t {
 106         u_int8_t        element_id;
 107         u_int8_t        length;
 108         u_int16_t       dwell_time;
 109         u_int8_t        hop_set;
 110         u_int8_t        hop_pattern;
 111         u_int8_t        hop_index;
 112 };
 113
 114 struct ds_t {
 115         u_int8_t        element_id;
 116         u_int8_t        length;
 117         u_int8_t        channel;
 118 };
 119
 120 struct cf_t {
 121         u_int8_t        element_id;
 122         u_int8_t        length;
 123         u_int8_t        count;
 124         u_int8_t        period;
 125         u_int16_t       max_duration;
 126         u_int16_t       dur_remaing;
 127 };
 128
 129 struct tim_t {
 130         u_int8_t        element_id;
 131         u_int8_t        length;
 132         u_int8_t        count;
 133         u_int8_t        period;
 134         u_int8_t        bitmap_control;
 135         u_int8_t        bitmap[251];
 136 };
 137
 138 #define E_SSID          0
 139 #define E_RATES         1
 140 #define E_FH            2
 141 #define E_DS            3
 142 #define E_CF            4
 143 #define E_TIM           5
 144 #define E_IBSS          6
 145 /* reserved             7 */
 146 /* reserved             8 */
 147 /* reserved             9 */
 148 /* reserved             10 */
 149 /* reserved             11 */
 150 /* reserved             12 */
 151 /* reserved             13 */
 152 /* reserved             14 */
 153 /* reserved             15 */
 154 /* reserved             16 */
 155
 156 #define E_CHALLENGE     16
 157 /* reserved             17 */
 158 /* reserved             18 */
 159 /* reserved             19 */
 160 /* reserved             16 */
 161 /* reserved             16 */
 162
 163
 164 struct mgmt_body_t {
 165         u_int8_t        timestamp[8];
 166         u_int16_t       beacon_interval;
 167         u_int16_t       listen_interval;
 168         u_int16_t       status_code;
 169         u_int16_t       aid;
 170         u_char          ap[6];
 171         u_int16_t       reason_code;
 172         u_int16_t       auth_alg;
 173         u_int16_t       auth_trans_seq_num;
 174         struct challenge_t  challenge;
 175         u_int16_t       capability_info;
 176         struct ssid_t   ssid;
 177         struct rates_t  rates;
 178         struct ds_t     ds;
 179         struct cf_t     cf;
 180         struct fh_t     fh;
 181         struct tim_t    tim;
 182 };
 183
 184 struct ctrl_rts_t {
 185         u_int16_t       fc;
 186         u_int16_t       duration;
 187         u_int8_t        ra[6];
 188         u_int8_t        ta[6];
 189         u_int8_t        fcs[4];
 190 };
 191
 192 #define CTRL_RTS_LEN    (2+2+6+6+4)
 193
 194 struct ctrl_cts_t {
 195         u_int16_t       fc;
 196         u_int16_t       duration;
 197         u_int8_t        ra[6];
 198         u_int8_t        fcs[4];
 199 };
 200
 201 #define CTRL_CTS_LEN    (2+2+6+4)
 202
 203 struct ctrl_ack_t {
 204         u_int16_t       fc;
 205         u_int16_t       duration;
 206         u_int8_t        ra[6];
 207         u_int8_t        fcs[4];
 208 };
 209
 210 #define CTRL_ACK_LEN    (2+2+6+4)
 211
 212 struct ctrl_ps_poll_t {
 213         u_int16_t       fc;
 214         u_int16_t       aid;
 215         u_int8_t        bssid[6];
 216         u_int8_t        ta[6];
 217         u_int8_t        fcs[4];
 218 };
 219
 220 #define CTRL_PS_POLL_LEN        (2+2+6+6+4)
 221
 222 struct ctrl_end_t {
 223         u_int16_t       fc;
 224         u_int16_t       duration;
 225         u_int8_t        ra[6];
 226         u_int8_t        bssid[6];
 227         u_int8_t        fcs[4];
 228 };
 229
 230 #define CTRL_END_LEN    (2+2+6+6+4)
 231
 232 struct ctrl_end_ack_t {
 233         u_int16_t       fc;
 234         u_int16_t       duration;
 235         u_int8_t        ra[6];
 236         u_int8_t        bssid[6];
 237         u_int8_t        fcs[4];
 238 };
 239
 240 #define CTRL_END_ACK_LEN        (2+2+6+6+4)
 241
 242 #define IV_IV(iv)       ((iv) & 0xFFFFFF)
 243 #define IV_PAD(iv)      (((iv) >> 24) & 0x3F)
 244 #define IV_KEYID(iv)    (((iv) >> 30) & 0x03)