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 (at) 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_CTL_LEN 2 34 #define IEEE802_11_IV_LEN 3 35 #define IEEE802_11_KID_LEN 1 36 37 /* Frame check sequence length. */ 38 #define IEEE802_11_FCS_LEN 4 39 40 /* Lengths of beacon components. */ 41 #define IEEE802_11_TSTAMP_LEN 8 42 #define IEEE802_11_BCNINT_LEN 2 43 #define IEEE802_11_CAPINFO_LEN 2 44 #define IEEE802_11_LISTENINT_LEN 2 45 46 #define IEEE802_11_AID_LEN 2 47 #define IEEE802_11_STATUS_LEN 2 48 #define IEEE802_11_REASON_LEN 2 49 50 /* Length of previous AP in reassocation frame */ 51 #define IEEE802_11_AP_LEN 6 52 53 #define T_MGMT 0x0 /* management */ 54 #define T_CTRL 0x1 /* control */ 55 #define T_DATA 0x2 /* data */ 56 #define T_RESV 0x3 /* reserved */ 57 58 #define ST_ASSOC_REQUEST 0x0 59 #define ST_ASSOC_RESPONSE 0x1 60 #define ST_REASSOC_REQUEST 0x2 61 #define ST_REASSOC_RESPONSE 0x3 62 #define ST_PROBE_REQUEST 0x4 63 #define ST_PROBE_RESPONSE 0x5 64 /* RESERVED 0x6 */ 65 /* RESERVED 0x7 */ 66 #define ST_BEACON 0x8 67 #define ST_ATIM 0x9 68 #define ST_DISASSOC 0xA 69 #define ST_AUTH 0xB 70 #define ST_DEAUTH 0xC 71 #define ST_ACTION 0xD 72 /* RESERVED 0xE */ 73 /* RESERVED 0xF */ 74 75 76 #define CTRL_CONTROL_WRAPPER 0x7 77 #define CTRL_BAR 0x8 78 #define CTRL_BA 0x9 79 #define CTRL_PS_POLL 0xA 80 #define CTRL_RTS 0xB 81 #define CTRL_CTS 0xC 82 #define CTRL_ACK 0xD 83 #define CTRL_CF_END 0xE 84 #define CTRL_END_ACK 0xF 85 86 #define DATA_DATA 0x0 87 #define DATA_DATA_CF_ACK 0x1 88 #define DATA_DATA_CF_POLL 0x2 89 #define DATA_DATA_CF_ACK_POLL 0x3 90 #define DATA_NODATA 0x4 91 #define DATA_NODATA_CF_ACK 0x5 92 #define DATA_NODATA_CF_POLL 0x6 93 #define DATA_NODATA_CF_ACK_POLL 0x7 94 95 #define DATA_QOS_DATA 0x8 96 #define DATA_QOS_DATA_CF_ACK 0x9 97 #define DATA_QOS_DATA_CF_POLL 0xA 98 #define DATA_QOS_DATA_CF_ACK_POLL 0xB 99 #define DATA_QOS_NODATA 0xC 100 #define DATA_QOS_CF_POLL_NODATA 0xE 101 #define DATA_QOS_CF_ACK_POLL_NODATA 0xF 102 103 /* 104 * The subtype field of a data frame is, in effect, composed of 4 flag 105 * bits - CF-Ack, CF-Poll, Null (means the frame doesn't actually have 106 * any data), and QoS. 107 */ 108 #define DATA_FRAME_IS_CF_ACK(x) ((x) & 0x01) 109 #define DATA_FRAME_IS_CF_POLL(x) ((x) & 0x02) 110 #define DATA_FRAME_IS_NULL(x) ((x) & 0x04) 111 #define DATA_FRAME_IS_QOS(x) ((x) & 0x08) 112 113 /* 114 * Bits in the frame control field. 115 */ 116 #define FC_VERSION(fc) ((fc) & 0x3) 117 #define FC_TYPE(fc) (((fc) >> 2) & 0x3) 118 #define FC_SUBTYPE(fc) (((fc) >> 4) & 0xF) 119 #define FC_TO_DS(fc) ((fc) & 0x0100) 120 #define FC_FROM_DS(fc) ((fc) & 0x0200) 121 #define FC_MORE_FLAG(fc) ((fc) & 0x0400) 122 #define FC_RETRY(fc) ((fc) & 0x0800) 123 #define FC_POWER_MGMT(fc) ((fc) & 0x1000) 124 #define FC_MORE_DATA(fc) ((fc) & 0x2000) 125 #define FC_WEP(fc) ((fc) & 0x4000) 126 #define FC_ORDER(fc) ((fc) & 0x8000) 127 128 struct mgmt_header_t { 129 u_int16_t fc; 130 u_int16_t duration; 131 u_int8_t da[6]; 132 u_int8_t sa[6]; 133 u_int8_t bssid[6]; 134 u_int16_t seq_ctrl; 135 }; 136 137 #define MGMT_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ 138 IEEE802_11_DA_LEN+IEEE802_11_SA_LEN+\ 139 IEEE802_11_BSSID_LEN+IEEE802_11_SEQ_LEN) 140 141 #define CAPABILITY_ESS(cap) ((cap) & 0x0001) 142 #define CAPABILITY_IBSS(cap) ((cap) & 0x0002) 143 #define CAPABILITY_CFP(cap) ((cap) & 0x0004) 144 #define CAPABILITY_CFP_REQ(cap) ((cap) & 0x0008) 145 #define CAPABILITY_PRIVACY(cap) ((cap) & 0x0010) 146 147 struct ssid_t { 148 u_int8_t element_id; 149 u_int8_t length; 150 u_char ssid[33]; /* 32 + 1 for null */ 151 }; 152 153 struct rates_t { 154 u_int8_t element_id; 155 u_int8_t length; 156 u_int8_t rate[16]; 157 }; 158 159 struct challenge_t { 160 u_int8_t element_id; 161 u_int8_t length; 162 u_int8_t text[254]; /* 1-253 + 1 for null */ 163 }; 164 165 struct fh_t { 166 u_int8_t element_id; 167 u_int8_t length; 168 u_int16_t dwell_time; 169 u_int8_t hop_set; 170 u_int8_t hop_pattern; 171 u_int8_t hop_index; 172 }; 173 174 struct ds_t { 175 u_int8_t element_id; 176 u_int8_t length; 177 u_int8_t channel; 178 }; 179 180 struct cf_t { 181 u_int8_t element_id; 182 u_int8_t length; 183 u_int8_t count; 184 u_int8_t period; 185 u_int16_t max_duration; 186 u_int16_t dur_remaing; 187 }; 188 189 struct tim_t { 190 u_int8_t element_id; 191 u_int8_t length; 192 u_int8_t count; 193 u_int8_t period; 194 u_int8_t bitmap_control; 195 u_int8_t bitmap[251]; 196 }; 197 198 #define E_SSID 0 199 #define E_RATES 1 200 #define E_FH 2 201 #define E_DS 3 202 #define E_CF 4 203 #define E_TIM 5 204 #define E_IBSS 6 205 /* reserved 7 */ 206 /* reserved 8 */ 207 /* reserved 9 */ 208 /* reserved 10 */ 209 /* reserved 11 */ 210 /* reserved 12 */ 211 /* reserved 13 */ 212 /* reserved 14 */ 213 /* reserved 15 */ 214 /* reserved 16 */ 215 216 #define E_CHALLENGE 16 217 /* reserved 17 */ 218 /* reserved 18 */ 219 /* reserved 19 */ 220 /* reserved 16 */ 221 /* reserved 16 */ 222 223 224 struct mgmt_body_t { 225 u_int8_t timestamp[IEEE802_11_TSTAMP_LEN]; 226 u_int16_t beacon_interval; 227 u_int16_t listen_interval; 228 u_int16_t status_code; 229 u_int16_t aid; 230 u_char ap[IEEE802_11_AP_LEN]; 231 u_int16_t reason_code; 232 u_int16_t auth_alg; 233 u_int16_t auth_trans_seq_num; 234 int challenge_present; 235 struct challenge_t challenge; 236 u_int16_t capability_info; 237 int ssid_present; 238 struct ssid_t ssid; 239 int rates_present; 240 struct rates_t rates; 241 int ds_present; 242 struct ds_t ds; 243 int cf_present; 244 struct cf_t cf; 245 int fh_present; 246 struct fh_t fh; 247 int tim_present; 248 struct tim_t tim; 249 }; 250 251 struct ctrl_rts_t { 252 u_int16_t fc; 253 u_int16_t duration; 254 u_int8_t ra[6]; 255 u_int8_t ta[6]; 256 u_int8_t fcs[4]; 257 }; 258 259 #define CTRL_RTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ 260 IEEE802_11_RA_LEN+IEEE802_11_TA_LEN) 261 262 struct ctrl_cts_t { 263 u_int16_t fc; 264 u_int16_t duration; 265 u_int8_t ra[6]; 266 u_int8_t fcs[4]; 267 }; 268 269 #define CTRL_CTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN) 270 271 struct ctrl_ack_t { 272 u_int16_t fc; 273 u_int16_t duration; 274 u_int8_t ra[6]; 275 u_int8_t fcs[4]; 276 }; 277 278 #define CTRL_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN) 279 280 struct ctrl_ps_poll_t { 281 u_int16_t fc; 282 u_int16_t aid; 283 u_int8_t bssid[6]; 284 u_int8_t ta[6]; 285 u_int8_t fcs[4]; 286 }; 287 288 #define CTRL_PS_POLL_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_AID_LEN+\ 289 IEEE802_11_BSSID_LEN+IEEE802_11_TA_LEN) 290 291 struct ctrl_end_t { 292 u_int16_t fc; 293 u_int16_t duration; 294 u_int8_t ra[6]; 295 u_int8_t bssid[6]; 296 u_int8_t fcs[4]; 297 }; 298 299 #define CTRL_END_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ 300 IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN) 301 302 struct ctrl_end_ack_t { 303 u_int16_t fc; 304 u_int16_t duration; 305 u_int8_t ra[6]; 306 u_int8_t bssid[6]; 307 u_int8_t fcs[4]; 308 }; 309 310 #define CTRL_END_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ 311 IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN) 312 313 struct ctrl_ba_t { 314 u_int16_t fc; 315 u_int16_t duration; 316 u_int8_t ra[6]; 317 u_int8_t fcs[4]; 318 }; 319 320 #define CTRL_BA_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN) 321 322 struct ctrl_bar_t { 323 u_int16_t fc; 324 u_int16_t dur; 325 u_int8_t ra[6]; 326 u_int8_t ta[6]; 327 u_int16_t ctl; 328 u_int16_t seq; 329 u_int8_t fcs[4]; 330 }; 331 332 #define CTRL_BAR_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ 333 IEEE802_11_RA_LEN+IEEE802_11_TA_LEN+\ 334 IEEE802_11_CTL_LEN+IEEE802_11_SEQ_LEN) 335 336 struct meshcntl_t { 337 u_int8_t flags; 338 u_int8_t ttl; 339 u_int8_t seq[4]; 340 u_int8_t addr4[6]; 341 u_int8_t addr5[6]; 342 u_int8_t addr6[6]; 343 }; 344 345 #define IV_IV(iv) ((iv) & 0xFFFFFF) 346 #define IV_PAD(iv) (((iv) >> 24) & 0x3F) 347 #define IV_KEYID(iv) (((iv) >> 30) & 0x03) 348
