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31 * Modifications to fit into the linux IEEE 802.11 stack,
32 * Mike Kershaw (dragorn@kismetwireless.net)
35 #ifndef IEEE80211RADIOTAP_H
36 #define IEEE80211RADIOTAP_H
40 /* Base version of the radiotap packet header data */
41 #define PKTHDR_RADIOTAP_VERSION 0
43 /* A generic radio capture format is desirable. There is one for
44 * Linux, but it is neither rigidly defined (there were not even
45 * units given for some fields) nor easily extensible.
47 * I suggest the following extensible radio capture format. It is
48 * based on a bitmap indicating which fields are present.
50 * I am trying to describe precisely what the application programmer
51 * should expect in the following, and for that reason I tell the
52 * units and origin of each measurement (where it applies), or else I
53 * use sufficiently weaselly language ("is a monotonically nondecreasing
54 * function of...") that I cannot set false expectations for lawyerly
58 /* The radio capture header precedes the 802.11 header.
59 * All data in the header is little endian on all platforms.
61 struct ieee80211_radiotap_header {
62 uint8_t it_version; /* Version 0. Only increases
63 * for drastic changes,
64 * introduction of compatible
65 * new fields does not count.
68 uint16_t it_len; /* length of the whole
69 * header in bytes, including
71 * it_len, and data fields.
73 uint32_t it_present; /* A bitmap telling which
74 * fields are present. Set bit 31
75 * (0x80000000) to extend the
76 * bitmap by another 32 bits.
77 * Additional extensions are made
82 /* Name Data type Units
83 * ---- --------- -----
85 * IEEE80211_RADIOTAP_TSFT __le64 microseconds
87 * Value in microseconds of the MAC's 64-bit 802.11 Time
88 * Synchronization Function timer when the first bit of the
89 * MPDU arrived at the MAC. For received frames, only.
91 * IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap
93 * Tx/Rx frequency in MHz, followed by flags (see below).
95 * IEEE80211_RADIOTAP_FHSS uint16_t see below
97 * For frequency-hopping radios, the hop set (first byte)
98 * and pattern (second byte).
100 * IEEE80211_RADIOTAP_RATE u8 500kb/s
104 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from
105 * one milliwatt (dBm)
107 * RF signal power at the antenna, decibel difference from
110 * IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from
111 * one milliwatt (dBm)
113 * RF noise power at the antenna, decibel difference from one
116 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB)
118 * RF signal power at the antenna, decibel difference from an
119 * arbitrary, fixed reference.
121 * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB)
123 * RF noise power at the antenna, decibel difference from an
124 * arbitrary, fixed reference point.
126 * IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless
128 * Quality of Barker code lock. Unitless. Monotonically
129 * nondecreasing with "better" lock strength. Called "Signal
130 * Quality" in datasheets. (Is there a standard way to measure
133 * IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless
135 * Transmit power expressed as unitless distance from max
136 * power set at factory calibration. 0 is max power.
137 * Monotonically nondecreasing with lower power levels.
139 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB)
141 * Transmit power expressed as decibel distance from max power
142 * set at factory calibration. 0 is max power. Monotonically
143 * nondecreasing with lower power levels.
145 * IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from
146 * one milliwatt (dBm)
148 * Transmit power expressed as dBm (decibels from a 1 milliwatt
149 * reference). This is the absolute power level measured at
152 * IEEE80211_RADIOTAP_FLAGS u8 bitmap
154 * Properties of transmitted and received frames. See flags
157 * IEEE80211_RADIOTAP_ANTENNA u8 antenna index
159 * Unitless indication of the Rx/Tx antenna for this packet.
160 * The first antenna is antenna 0.
162 * IEEE80211_RADIOTAP_RX_FLAGS uint16_t bitmap
164 * Properties of received frames. See flags defined below.
166 * IEEE80211_RADIOTAP_TX_FLAGS uint16_t bitmap
168 * Properties of transmitted frames. See flags defined below.
170 * IEEE80211_RADIOTAP_RTS_RETRIES u8 data
172 * Number of rts retries a transmitted frame used.
174 * IEEE80211_RADIOTAP_DATA_RETRIES u8 data
176 * Number of unicast retries a transmitted frame used.
179 enum ieee80211_radiotap_type {
180 IEEE80211_RADIOTAP_TSFT = 0,
181 IEEE80211_RADIOTAP_FLAGS = 1,
182 IEEE80211_RADIOTAP_RATE = 2,
183 IEEE80211_RADIOTAP_CHANNEL = 3,
184 IEEE80211_RADIOTAP_FHSS = 4,
185 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
186 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
187 IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
188 IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
189 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
190 IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
191 IEEE80211_RADIOTAP_ANTENNA = 11,
192 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
193 IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
194 IEEE80211_RADIOTAP_RX_FLAGS = 14,
195 IEEE80211_RADIOTAP_TX_FLAGS = 15,
196 IEEE80211_RADIOTAP_RTS_RETRIES = 16,
197 IEEE80211_RADIOTAP_DATA_RETRIES = 17,
199 /* valid in every it_present bitmap, even vendor namespaces */
200 IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
201 IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
202 IEEE80211_RADIOTAP_EXT = 31
206 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
207 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
208 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
209 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
210 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
211 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
212 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
213 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
215 /* For IEEE80211_RADIOTAP_FLAGS */
216 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
219 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
223 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
224 * with WEP encryption
226 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
229 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
230 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
231 * 802.11 header and payload
232 * (to 32-bit boundary)
234 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* frame failed FCS check */
236 /* For IEEE80211_RADIOTAP_RX_FLAGS */
237 #define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* bad PLCP */
239 /* For IEEE80211_RADIOTAP_TX_FLAGS */
240 #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive
242 #define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
243 #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
245 #endif /* IEEE80211_RADIOTAP_H */