/* @(#) $Header: /tcpdump/master/tcpdump/ieee802_11.h,v 1.9.4.3 2007/07/22 20:01:16 guy Exp $ (LBL) */ /* * Copyright (c) 2001 * Fortress Technologies * Charlie Lenahan ( clenahan@fortresstech.com ) * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* Lengths of 802.11 header components. */ #define IEEE802_11_FC_LEN 2 #define IEEE802_11_DUR_LEN 2 #define IEEE802_11_DA_LEN 6 #define IEEE802_11_SA_LEN 6 #define IEEE802_11_BSSID_LEN 6 #define IEEE802_11_RA_LEN 6 #define IEEE802_11_TA_LEN 6 #define IEEE802_11_SEQ_LEN 2 #define IEEE802_11_IV_LEN 3 #define IEEE802_11_KID_LEN 1 /* Frame check sequence length. */ #define IEEE802_11_FCS_LEN 4 /* Lengths of beacon components. */ #define IEEE802_11_TSTAMP_LEN 8 #define IEEE802_11_BCNINT_LEN 2 #define IEEE802_11_CAPINFO_LEN 2 #define IEEE802_11_LISTENINT_LEN 2 #define IEEE802_11_AID_LEN 2 #define IEEE802_11_STATUS_LEN 2 #define IEEE802_11_REASON_LEN 2 /* Length of previous AP in reassocation frame */ #define IEEE802_11_AP_LEN 6 #define T_MGMT 0x0 /* management */ #define T_CTRL 0x1 /* control */ #define T_DATA 0x2 /* data */ #define T_RESV 0x3 /* reserved */ #define ST_ASSOC_REQUEST 0x0 #define ST_ASSOC_RESPONSE 0x1 #define ST_REASSOC_REQUEST 0x2 #define ST_REASSOC_RESPONSE 0x3 #define ST_PROBE_REQUEST 0x4 #define ST_PROBE_RESPONSE 0x5 /* RESERVED 0x6 */ /* RESERVED 0x7 */ #define ST_BEACON 0x8 #define ST_ATIM 0x9 #define ST_DISASSOC 0xA #define ST_AUTH 0xB #define ST_DEAUTH 0xC /* RESERVED 0xD */ /* RESERVED 0xE */ /* RESERVED 0xF */ #define CTRL_PS_POLL 0xA #define CTRL_RTS 0xB #define CTRL_CTS 0xC #define CTRL_ACK 0xD #define CTRL_CF_END 0xE #define CTRL_END_ACK 0xF #define DATA_DATA 0x0 #define DATA_DATA_CF_ACK 0x1 #define DATA_DATA_CF_POLL 0x2 #define DATA_DATA_CF_ACK_POLL 0x3 #define DATA_NODATA 0x4 #define DATA_NODATA_CF_ACK 0x5 #define DATA_NODATA_CF_POLL 0x6 #define DATA_NODATA_CF_ACK_POLL 0x7 #define DATA_QOS_DATA 0x8 #define DATA_QOS_DATA_CF_ACK 0x9 #define DATA_QOS_DATA_CF_POLL 0xA #define DATA_QOS_DATA_CF_ACK_POLL 0xB #define DATA_QOS_NODATA 0xC #define DATA_QOS_CF_POLL_NODATA 0xE #define DATA_QOS_CF_ACK_POLL_NODATA 0xF /* * The subtype field of a data frame is, in effect, composed of 4 flag * bits - CF-Ack, CF-Poll, Null (means the frame doesn't actually have * any data), and QoS. */ #define DATA_FRAME_IS_CF_ACK(x) ((x) & 0x01) #define DATA_FRAME_IS_CF_POLL(x) ((x) & 0x02) #define DATA_FRAME_IS_NULL(x) ((x) & 0x04) #define DATA_FRAME_IS_QOS(x) ((x) & 0x08) /* * Bits in the frame control field. */ #define FC_VERSION(fc) ((fc) & 0x3) #define FC_TYPE(fc) (((fc) >> 2) & 0x3) #define FC_SUBTYPE(fc) (((fc) >> 4) & 0xF) #define FC_TO_DS(fc) ((fc) & 0x0100) #define FC_FROM_DS(fc) ((fc) & 0x0200) #define FC_MORE_FLAG(fc) ((fc) & 0x0400) #define FC_RETRY(fc) ((fc) & 0x0800) #define FC_POWER_MGMT(fc) ((fc) & 0x1000) #define FC_MORE_DATA(fc) ((fc) & 0x2000) #define FC_WEP(fc) ((fc) & 0x4000) #define FC_ORDER(fc) ((fc) & 0x8000) struct mgmt_header_t { u_int16_t fc; u_int16_t duration; u_int8_t da[6]; u_int8_t sa[6]; u_int8_t bssid[6]; u_int16_t seq_ctrl; }; #define MGMT_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ IEEE802_11_DA_LEN+IEEE802_11_SA_LEN+\ IEEE802_11_BSSID_LEN+IEEE802_11_SEQ_LEN) #define CAPABILITY_ESS(cap) ((cap) & 0x0001) #define CAPABILITY_IBSS(cap) ((cap) & 0x0002) #define CAPABILITY_CFP(cap) ((cap) & 0x0004) #define CAPABILITY_CFP_REQ(cap) ((cap) & 0x0008) #define CAPABILITY_PRIVACY(cap) ((cap) & 0x0010) typedef enum { NOT_PRESENT, PRESENT, TRUNCATED } elem_status_t; struct ssid_t { u_int8_t element_id; u_int8_t length; u_char ssid[33]; /* 32 + 1 for null */ }; struct rates_t { u_int8_t element_id; u_int8_t length; u_int8_t rate[16]; }; struct challenge_t { u_int8_t element_id; u_int8_t length; u_int8_t text[254]; /* 1-253 + 1 for null */ }; struct fh_t { u_int8_t element_id; u_int8_t length; u_int16_t dwell_time; u_int8_t hop_set; u_int8_t hop_pattern; u_int8_t hop_index; }; struct ds_t { u_int8_t element_id; u_int8_t length; u_int8_t channel; }; struct cf_t { u_int8_t element_id; u_int8_t length; u_int8_t count; u_int8_t period; u_int16_t max_duration; u_int16_t dur_remaing; }; struct tim_t { u_int8_t element_id; u_int8_t length; u_int8_t count; u_int8_t period; u_int8_t bitmap_control; u_int8_t bitmap[251]; }; #define E_SSID 0 #define E_RATES 1 #define E_FH 2 #define E_DS 3 #define E_CF 4 #define E_TIM 5 #define E_IBSS 6 /* reserved 7 */ /* reserved 8 */ /* reserved 9 */ /* reserved 10 */ /* reserved 11 */ /* reserved 12 */ /* reserved 13 */ /* reserved 14 */ /* reserved 15 */ /* reserved 16 */ #define E_CHALLENGE 16 /* reserved 17 */ /* reserved 18 */ /* reserved 19 */ /* reserved 16 */ /* reserved 16 */ struct mgmt_body_t { u_int8_t timestamp[IEEE802_11_TSTAMP_LEN]; u_int16_t beacon_interval; u_int16_t listen_interval; u_int16_t status_code; u_int16_t aid; u_char ap[IEEE802_11_AP_LEN]; u_int16_t reason_code; u_int16_t auth_alg; u_int16_t auth_trans_seq_num; elem_status_t challenge_status; struct challenge_t challenge; u_int16_t capability_info; elem_status_t ssid_status; struct ssid_t ssid; elem_status_t rates_status; struct rates_t rates; elem_status_t ds_status; struct ds_t ds; elem_status_t cf_status; struct cf_t cf; elem_status_t fh_status; struct fh_t fh; elem_status_t tim_status; struct tim_t tim; }; struct ctrl_rts_t { u_int16_t fc; u_int16_t duration; u_int8_t ra[6]; u_int8_t ta[6]; u_int8_t fcs[4]; }; #define CTRL_RTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ IEEE802_11_RA_LEN+IEEE802_11_TA_LEN) struct ctrl_cts_t { u_int16_t fc; u_int16_t duration; u_int8_t ra[6]; u_int8_t fcs[4]; }; #define CTRL_CTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN) struct ctrl_ack_t { u_int16_t fc; u_int16_t duration; u_int8_t ra[6]; u_int8_t fcs[4]; }; #define CTRL_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN) struct ctrl_ps_poll_t { u_int16_t fc; u_int16_t aid; u_int8_t bssid[6]; u_int8_t ta[6]; u_int8_t fcs[4]; }; #define CTRL_PS_POLL_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_AID_LEN+\ IEEE802_11_BSSID_LEN+IEEE802_11_TA_LEN) struct ctrl_end_t { u_int16_t fc; u_int16_t duration; u_int8_t ra[6]; u_int8_t bssid[6]; u_int8_t fcs[4]; }; #define CTRL_END_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN) struct ctrl_end_ack_t { u_int16_t fc; u_int16_t duration; u_int8_t ra[6]; u_int8_t bssid[6]; u_int8_t fcs[4]; }; #define CTRL_END_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\ IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN) #define IV_IV(iv) ((iv) & 0xFFFFFF) #define IV_PAD(iv) (((iv) >> 24) & 0x3F) #define IV_KEYID(iv) (((iv) >> 30) & 0x03)