mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-23 18:14:29 +08:00
91f7cb2f57
[This patch] fixes some bugs and adds a new feature. Control packets were showing as [|802.11] because tcpdump expected for there to be an FCS on each one (wrong assumption). Also, even if pieces of a control packet are missing, I have made tcpdump print its type when it knows it. The new features is that if you give -v, the 802.11 Duration field (for virtual carrier sense) is printed. This is useful for detecting hardware/firmware bugs (!!) and for debugging the new crop of 802.11 drivers.
286 lines
6.9 KiB
C
286 lines
6.9 KiB
C
/* @(#) $Header: /tcpdump/master/tcpdump/ieee802_11.h,v 1.9 2003-07-22 17:36:57 guy Exp $ (LBL) */
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/*
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* Copyright (c) 2001
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* Fortress Technologies
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* Charlie Lenahan ( clenahan@fortresstech.com )
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* Lengths of 802.11 header components. */
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#define IEEE802_11_FC_LEN 2
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#define IEEE802_11_DUR_LEN 2
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#define IEEE802_11_DA_LEN 6
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#define IEEE802_11_SA_LEN 6
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#define IEEE802_11_BSSID_LEN 6
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#define IEEE802_11_RA_LEN 6
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#define IEEE802_11_TA_LEN 6
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#define IEEE802_11_SEQ_LEN 2
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#define IEEE802_11_IV_LEN 3
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#define IEEE802_11_KID_LEN 1
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/* Frame check sequence length. */
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#define IEEE802_11_FCS_LEN 4
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/* Lengths of beacon components. */
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#define IEEE802_11_TSTAMP_LEN 8
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#define IEEE802_11_BCNINT_LEN 2
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#define IEEE802_11_CAPINFO_LEN 2
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#define IEEE802_11_LISTENINT_LEN 2
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#define IEEE802_11_AID_LEN 2
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#define IEEE802_11_STATUS_LEN 2
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#define IEEE802_11_REASON_LEN 2
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/* Length of previous AP in reassocation frame */
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#define IEEE802_11_AP_LEN 6
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#define T_MGMT 0x0 /* management */
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#define T_CTRL 0x1 /* control */
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#define T_DATA 0x2 /* data */
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#define T_RESV 0x3 /* reserved */
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#define ST_ASSOC_REQUEST 0x0
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#define ST_ASSOC_RESPONSE 0x1
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#define ST_REASSOC_REQUEST 0x2
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#define ST_REASSOC_RESPONSE 0x3
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#define ST_PROBE_REQUEST 0x4
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#define ST_PROBE_RESPONSE 0x5
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/* RESERVED 0x6 */
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/* RESERVED 0x7 */
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#define ST_BEACON 0x8
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#define ST_ATIM 0x9
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#define ST_DISASSOC 0xA
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#define ST_AUTH 0xB
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#define ST_DEAUTH 0xC
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/* RESERVED 0xD */
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/* RESERVED 0xE */
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/* RESERVED 0xF */
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#define CTRL_PS_POLL 0xA
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#define CTRL_RTS 0xB
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#define CTRL_CTS 0xC
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#define CTRL_ACK 0xD
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#define CTRL_CF_END 0xE
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#define CTRL_END_ACK 0xF
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#define DATA_DATA 0x0
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#define DATA_DATA_CF_ACK 0x1
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#define DATA_DATA_CF_POLL 0x2
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#define DATA_DATA_CF_ACK_POLL 0x3
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#define DATA_NODATA 0x4
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#define DATA_NODATA_CF_ACK 0x5
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#define DATA_NODATA_CF_POLL 0x6
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#define DATA_NODATA_CF_ACK_POLL 0x7
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/*
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* Bits in the frame control field.
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*/
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#define FC_VERSION(fc) ((fc) & 0x3)
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#define FC_TYPE(fc) (((fc) >> 2) & 0x3)
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#define FC_SUBTYPE(fc) (((fc) >> 4) & 0xF)
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#define FC_TO_DS(fc) ((fc) & 0x0100)
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#define FC_FROM_DS(fc) ((fc) & 0x0200)
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#define FC_MORE_FLAG(fc) ((fc) & 0x0400)
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#define FC_RETRY(fc) ((fc) & 0x0800)
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#define FC_POWER_MGMT(fc) ((fc) & 0x1000)
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#define FC_MORE_DATA(fc) ((fc) & 0x2000)
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#define FC_WEP(fc) ((fc) & 0x4000)
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#define FC_ORDER(fc) ((fc) & 0x8000)
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struct mgmt_header_t {
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u_int16_t fc;
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u_int16_t duration;
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u_int8_t da[6];
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u_int8_t sa[6];
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u_int8_t bssid[6];
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u_int16_t seq_ctrl;
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};
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#define MGMT_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
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IEEE802_11_DA_LEN+IEEE802_11_SA_LEN+\
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IEEE802_11_BSSID_LEN+IEEE802_11_SEQ_LEN)
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#define CAPABILITY_ESS(cap) ((cap) & 0x0001)
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#define CAPABILITY_IBSS(cap) ((cap) & 0x0002)
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#define CAPABILITY_CFP(cap) ((cap) & 0x0004)
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#define CAPABILITY_CFP_REQ(cap) ((cap) & 0x0008)
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#define CAPABILITY_PRIVACY(cap) ((cap) & 0x0010)
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struct ssid_t {
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u_int8_t element_id;
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u_int8_t length;
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u_char ssid[33]; /* 32 + 1 for null */
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};
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struct rates_t {
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u_int8_t element_id;
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u_int8_t length;
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u_int8_t rate[8];
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};
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struct challenge_t {
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u_int8_t element_id;
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u_int8_t length;
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u_int8_t text[254]; /* 1-253 + 1 for null */
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};
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struct fh_t {
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u_int8_t element_id;
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u_int8_t length;
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u_int16_t dwell_time;
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u_int8_t hop_set;
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u_int8_t hop_pattern;
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u_int8_t hop_index;
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};
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struct ds_t {
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u_int8_t element_id;
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u_int8_t length;
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u_int8_t channel;
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};
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struct cf_t {
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u_int8_t element_id;
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u_int8_t length;
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u_int8_t count;
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u_int8_t period;
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u_int16_t max_duration;
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u_int16_t dur_remaing;
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};
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struct tim_t {
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u_int8_t element_id;
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u_int8_t length;
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u_int8_t count;
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u_int8_t period;
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u_int8_t bitmap_control;
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u_int8_t bitmap[251];
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};
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#define E_SSID 0
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#define E_RATES 1
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#define E_FH 2
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#define E_DS 3
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#define E_CF 4
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#define E_TIM 5
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#define E_IBSS 6
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/* reserved 7 */
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/* reserved 8 */
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/* reserved 9 */
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/* reserved 10 */
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/* reserved 11 */
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/* reserved 12 */
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/* reserved 13 */
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/* reserved 14 */
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/* reserved 15 */
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/* reserved 16 */
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#define E_CHALLENGE 16
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/* reserved 17 */
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/* reserved 18 */
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/* reserved 19 */
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/* reserved 16 */
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/* reserved 16 */
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struct mgmt_body_t {
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u_int8_t timestamp[8];
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u_int16_t beacon_interval;
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u_int16_t listen_interval;
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u_int16_t status_code;
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u_int16_t aid;
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u_char ap[6];
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u_int16_t reason_code;
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u_int16_t auth_alg;
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u_int16_t auth_trans_seq_num;
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struct challenge_t challenge;
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u_int16_t capability_info;
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struct ssid_t ssid;
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struct rates_t rates;
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struct ds_t ds;
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struct cf_t cf;
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struct fh_t fh;
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struct tim_t tim;
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};
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struct ctrl_rts_t {
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u_int16_t fc;
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u_int16_t duration;
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u_int8_t ra[6];
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u_int8_t ta[6];
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u_int8_t fcs[4];
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};
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#define CTRL_RTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
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IEEE802_11_RA_LEN+IEEE802_11_TA_LEN)
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struct ctrl_cts_t {
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u_int16_t fc;
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u_int16_t duration;
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u_int8_t ra[6];
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u_int8_t fcs[4];
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};
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#define CTRL_CTS_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)
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struct ctrl_ack_t {
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u_int16_t fc;
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u_int16_t duration;
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u_int8_t ra[6];
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u_int8_t fcs[4];
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};
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#define CTRL_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)
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struct ctrl_ps_poll_t {
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u_int16_t fc;
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u_int16_t aid;
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u_int8_t bssid[6];
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u_int8_t ta[6];
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u_int8_t fcs[4];
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};
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#define CTRL_PS_POLL_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_AID_LEN+\
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IEEE802_11_BSSID_LEN+IEEE802_11_TA_LEN)
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struct ctrl_end_t {
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u_int16_t fc;
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u_int16_t duration;
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u_int8_t ra[6];
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u_int8_t bssid[6];
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u_int8_t fcs[4];
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};
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#define CTRL_END_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
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IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN)
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struct ctrl_end_ack_t {
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u_int16_t fc;
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u_int16_t duration;
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u_int8_t ra[6];
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u_int8_t bssid[6];
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u_int8_t fcs[4];
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};
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#define CTRL_END_ACK_HDRLEN (IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
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IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN)
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#define IV_IV(iv) ((iv) & 0xFFFFFF)
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#define IV_PAD(iv) (((iv) >> 24) & 0x3F)
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#define IV_KEYID(iv) (((iv) >> 30) & 0x03)
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