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linux/include/net/ieee80211_radiotap.h
Mathy Vanhoef e02281e7a5 mac80211: add radiotap flag to prevent sequence number overwrite 
The radiotap specification contains a flag to indicate that the sequence
number of an injected frame should not be overwritten. Parse this flag
and define and set a corresponding Tx control flag.

Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@kuleuven.be>
Link: https://lore.kernel.org/r/20200723100153.31631-2-Mathy.Vanhoef@kuleuven.be
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2020-07-31 09:27:00 +02:00

368 lines
13 KiB
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/*
* Copyright (c) 2017 Intel Deutschland GmbH
* Copyright (c) 2018-2019 Intel Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __RADIOTAP_H
#define __RADIOTAP_H
#include <linux/kernel.h>
#include <asm/unaligned.h>
/**
* struct ieee82011_radiotap_header - base radiotap header
*/
struct ieee80211_radiotap_header {
/**
* @it_version: radiotap version, always 0
*/
uint8_t it_version;
/**
* @it_pad: padding (or alignment)
*/
uint8_t it_pad;
/**
* @it_len: overall radiotap header length
*/
__le16 it_len;
/**
* @it_present: (first) present word
*/
__le32 it_present;
} __packed;
/* version is always 0 */
#define PKTHDR_RADIOTAP_VERSION 0
/* see the radiotap website for the descriptions */
enum ieee80211_radiotap_presence {
IEEE80211_RADIOTAP_TSFT = 0,
IEEE80211_RADIOTAP_FLAGS = 1,
IEEE80211_RADIOTAP_RATE = 2,
IEEE80211_RADIOTAP_CHANNEL = 3,
IEEE80211_RADIOTAP_FHSS = 4,
IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
IEEE80211_RADIOTAP_ANTENNA = 11,
IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
IEEE80211_RADIOTAP_RX_FLAGS = 14,
IEEE80211_RADIOTAP_TX_FLAGS = 15,
IEEE80211_RADIOTAP_RTS_RETRIES = 16,
IEEE80211_RADIOTAP_DATA_RETRIES = 17,
/* 18 is XChannel, but it's not defined yet */
IEEE80211_RADIOTAP_MCS = 19,
IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
IEEE80211_RADIOTAP_VHT = 21,
IEEE80211_RADIOTAP_TIMESTAMP = 22,
IEEE80211_RADIOTAP_HE = 23,
IEEE80211_RADIOTAP_HE_MU = 24,
IEEE80211_RADIOTAP_ZERO_LEN_PSDU = 26,
IEEE80211_RADIOTAP_LSIG = 27,
/* valid in every it_present bitmap, even vendor namespaces */
IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
IEEE80211_RADIOTAP_EXT = 31
};
/* for IEEE80211_RADIOTAP_FLAGS */
enum ieee80211_radiotap_flags {
IEEE80211_RADIOTAP_F_CFP = 0x01,
IEEE80211_RADIOTAP_F_SHORTPRE = 0x02,
IEEE80211_RADIOTAP_F_WEP = 0x04,
IEEE80211_RADIOTAP_F_FRAG = 0x08,
IEEE80211_RADIOTAP_F_FCS = 0x10,
IEEE80211_RADIOTAP_F_DATAPAD = 0x20,
IEEE80211_RADIOTAP_F_BADFCS = 0x40,
};
/* for IEEE80211_RADIOTAP_CHANNEL */
enum ieee80211_radiotap_channel_flags {
IEEE80211_CHAN_CCK = 0x0020,
IEEE80211_CHAN_OFDM = 0x0040,
IEEE80211_CHAN_2GHZ = 0x0080,
IEEE80211_CHAN_5GHZ = 0x0100,
IEEE80211_CHAN_DYN = 0x0400,
IEEE80211_CHAN_HALF = 0x4000,
IEEE80211_CHAN_QUARTER = 0x8000,
};
/* for IEEE80211_RADIOTAP_RX_FLAGS */
enum ieee80211_radiotap_rx_flags {
IEEE80211_RADIOTAP_F_RX_BADPLCP = 0x0002,
};
/* for IEEE80211_RADIOTAP_TX_FLAGS */
enum ieee80211_radiotap_tx_flags {
IEEE80211_RADIOTAP_F_TX_FAIL = 0x0001,
IEEE80211_RADIOTAP_F_TX_CTS = 0x0002,
IEEE80211_RADIOTAP_F_TX_RTS = 0x0004,
IEEE80211_RADIOTAP_F_TX_NOACK = 0x0008,
IEEE80211_RADIOTAP_F_TX_NOSEQNO = 0x0010,
};
/* for IEEE80211_RADIOTAP_MCS "have" flags */
enum ieee80211_radiotap_mcs_have {
IEEE80211_RADIOTAP_MCS_HAVE_BW = 0x01,
IEEE80211_RADIOTAP_MCS_HAVE_MCS = 0x02,
IEEE80211_RADIOTAP_MCS_HAVE_GI = 0x04,
IEEE80211_RADIOTAP_MCS_HAVE_FMT = 0x08,
IEEE80211_RADIOTAP_MCS_HAVE_FEC = 0x10,
IEEE80211_RADIOTAP_MCS_HAVE_STBC = 0x20,
};
enum ieee80211_radiotap_mcs_flags {
IEEE80211_RADIOTAP_MCS_BW_MASK = 0x03,
IEEE80211_RADIOTAP_MCS_BW_20 = 0,
IEEE80211_RADIOTAP_MCS_BW_40 = 1,
IEEE80211_RADIOTAP_MCS_BW_20L = 2,
IEEE80211_RADIOTAP_MCS_BW_20U = 3,
IEEE80211_RADIOTAP_MCS_SGI = 0x04,
IEEE80211_RADIOTAP_MCS_FMT_GF = 0x08,
IEEE80211_RADIOTAP_MCS_FEC_LDPC = 0x10,
IEEE80211_RADIOTAP_MCS_STBC_MASK = 0x60,
IEEE80211_RADIOTAP_MCS_STBC_1 = 1,
IEEE80211_RADIOTAP_MCS_STBC_2 = 2,
IEEE80211_RADIOTAP_MCS_STBC_3 = 3,
IEEE80211_RADIOTAP_MCS_STBC_SHIFT = 5,
};
/* for IEEE80211_RADIOTAP_AMPDU_STATUS */
enum ieee80211_radiotap_ampdu_flags {
IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN = 0x0001,
IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN = 0x0002,
IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN = 0x0004,
IEEE80211_RADIOTAP_AMPDU_IS_LAST = 0x0008,
IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR = 0x0010,
IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN = 0x0020,
IEEE80211_RADIOTAP_AMPDU_EOF = 0x0040,
IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN = 0x0080,
};
/* for IEEE80211_RADIOTAP_VHT */
enum ieee80211_radiotap_vht_known {
IEEE80211_RADIOTAP_VHT_KNOWN_STBC = 0x0001,
IEEE80211_RADIOTAP_VHT_KNOWN_TXOP_PS_NA = 0x0002,
IEEE80211_RADIOTAP_VHT_KNOWN_GI = 0x0004,
IEEE80211_RADIOTAP_VHT_KNOWN_SGI_NSYM_DIS = 0x0008,
IEEE80211_RADIOTAP_VHT_KNOWN_LDPC_EXTRA_OFDM_SYM = 0x0010,
IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED = 0x0020,
IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH = 0x0040,
IEEE80211_RADIOTAP_VHT_KNOWN_GROUP_ID = 0x0080,
IEEE80211_RADIOTAP_VHT_KNOWN_PARTIAL_AID = 0x0100,
};
enum ieee80211_radiotap_vht_flags {
IEEE80211_RADIOTAP_VHT_FLAG_STBC = 0x01,
IEEE80211_RADIOTAP_VHT_FLAG_TXOP_PS_NA = 0x02,
IEEE80211_RADIOTAP_VHT_FLAG_SGI = 0x04,
IEEE80211_RADIOTAP_VHT_FLAG_SGI_NSYM_M10_9 = 0x08,
IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM = 0x10,
IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED = 0x20,
};
enum ieee80211_radiotap_vht_coding {
IEEE80211_RADIOTAP_CODING_LDPC_USER0 = 0x01,
IEEE80211_RADIOTAP_CODING_LDPC_USER1 = 0x02,
IEEE80211_RADIOTAP_CODING_LDPC_USER2 = 0x04,
IEEE80211_RADIOTAP_CODING_LDPC_USER3 = 0x08,
};
/* for IEEE80211_RADIOTAP_TIMESTAMP */
enum ieee80211_radiotap_timestamp_unit_spos {
IEEE80211_RADIOTAP_TIMESTAMP_UNIT_MASK = 0x000F,
IEEE80211_RADIOTAP_TIMESTAMP_UNIT_MS = 0x0000,
IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US = 0x0001,
IEEE80211_RADIOTAP_TIMESTAMP_UNIT_NS = 0x0003,
IEEE80211_RADIOTAP_TIMESTAMP_SPOS_MASK = 0x00F0,
IEEE80211_RADIOTAP_TIMESTAMP_SPOS_BEGIN_MDPU = 0x0000,
IEEE80211_RADIOTAP_TIMESTAMP_SPOS_PLCP_SIG_ACQ = 0x0010,
IEEE80211_RADIOTAP_TIMESTAMP_SPOS_EO_PPDU = 0x0020,
IEEE80211_RADIOTAP_TIMESTAMP_SPOS_EO_MPDU = 0x0030,
IEEE80211_RADIOTAP_TIMESTAMP_SPOS_UNKNOWN = 0x00F0,
};
enum ieee80211_radiotap_timestamp_flags {
IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT = 0x00,
IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT = 0x01,
IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY = 0x02,
};
struct ieee80211_radiotap_he {
__le16 data1, data2, data3, data4, data5, data6;
};
enum ieee80211_radiotap_he_bits {
IEEE80211_RADIOTAP_HE_DATA1_FORMAT_MASK = 3,
IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU = 0,
IEEE80211_RADIOTAP_HE_DATA1_FORMAT_EXT_SU = 1,
IEEE80211_RADIOTAP_HE_DATA1_FORMAT_MU = 2,
IEEE80211_RADIOTAP_HE_DATA1_FORMAT_TRIG = 3,
IEEE80211_RADIOTAP_HE_DATA1_BSS_COLOR_KNOWN = 0x0004,
IEEE80211_RADIOTAP_HE_DATA1_BEAM_CHANGE_KNOWN = 0x0008,
IEEE80211_RADIOTAP_HE_DATA1_UL_DL_KNOWN = 0x0010,
IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN = 0x0020,
IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN = 0x0040,
IEEE80211_RADIOTAP_HE_DATA1_CODING_KNOWN = 0x0080,
IEEE80211_RADIOTAP_HE_DATA1_LDPC_XSYMSEG_KNOWN = 0x0100,
IEEE80211_RADIOTAP_HE_DATA1_STBC_KNOWN = 0x0200,
IEEE80211_RADIOTAP_HE_DATA1_SPTL_REUSE_KNOWN = 0x0400,
IEEE80211_RADIOTAP_HE_DATA1_SPTL_REUSE2_KNOWN = 0x0800,
IEEE80211_RADIOTAP_HE_DATA1_SPTL_REUSE3_KNOWN = 0x1000,
IEEE80211_RADIOTAP_HE_DATA1_SPTL_REUSE4_KNOWN = 0x2000,
IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN = 0x4000,
IEEE80211_RADIOTAP_HE_DATA1_DOPPLER_KNOWN = 0x8000,
IEEE80211_RADIOTAP_HE_DATA2_PRISEC_80_KNOWN = 0x0001,
IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN = 0x0002,
IEEE80211_RADIOTAP_HE_DATA2_NUM_LTF_SYMS_KNOWN = 0x0004,
IEEE80211_RADIOTAP_HE_DATA2_PRE_FEC_PAD_KNOWN = 0x0008,
IEEE80211_RADIOTAP_HE_DATA2_TXBF_KNOWN = 0x0010,
IEEE80211_RADIOTAP_HE_DATA2_PE_DISAMBIG_KNOWN = 0x0020,
IEEE80211_RADIOTAP_HE_DATA2_TXOP_KNOWN = 0x0040,
IEEE80211_RADIOTAP_HE_DATA2_MIDAMBLE_KNOWN = 0x0080,
IEEE80211_RADIOTAP_HE_DATA2_RU_OFFSET = 0x3f00,
IEEE80211_RADIOTAP_HE_DATA2_RU_OFFSET_KNOWN = 0x4000,
IEEE80211_RADIOTAP_HE_DATA2_PRISEC_80_SEC = 0x8000,
IEEE80211_RADIOTAP_HE_DATA3_BSS_COLOR = 0x003f,
IEEE80211_RADIOTAP_HE_DATA3_BEAM_CHANGE = 0x0040,
IEEE80211_RADIOTAP_HE_DATA3_UL_DL = 0x0080,
IEEE80211_RADIOTAP_HE_DATA3_DATA_MCS = 0x0f00,
IEEE80211_RADIOTAP_HE_DATA3_DATA_DCM = 0x1000,
IEEE80211_RADIOTAP_HE_DATA3_CODING = 0x2000,
IEEE80211_RADIOTAP_HE_DATA3_LDPC_XSYMSEG = 0x4000,
IEEE80211_RADIOTAP_HE_DATA3_STBC = 0x8000,
IEEE80211_RADIOTAP_HE_DATA4_SU_MU_SPTL_REUSE = 0x000f,
IEEE80211_RADIOTAP_HE_DATA4_MU_STA_ID = 0x7ff0,
IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE1 = 0x000f,
IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE2 = 0x00f0,
IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE3 = 0x0f00,
IEEE80211_RADIOTAP_HE_DATA4_TB_SPTL_REUSE4 = 0xf000,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC = 0x000f,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ = 0,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ = 1,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ = 2,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ = 3,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_26T = 4,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_52T = 5,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_106T = 6,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_242T = 7,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_484T = 8,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_996T = 9,
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_2x996T = 10,
IEEE80211_RADIOTAP_HE_DATA5_GI = 0x0030,
IEEE80211_RADIOTAP_HE_DATA5_GI_0_8 = 0,
IEEE80211_RADIOTAP_HE_DATA5_GI_1_6 = 1,
IEEE80211_RADIOTAP_HE_DATA5_GI_3_2 = 2,
IEEE80211_RADIOTAP_HE_DATA5_LTF_SIZE = 0x00c0,
IEEE80211_RADIOTAP_HE_DATA5_LTF_SIZE_UNKNOWN = 0,
IEEE80211_RADIOTAP_HE_DATA5_LTF_SIZE_1X = 1,
IEEE80211_RADIOTAP_HE_DATA5_LTF_SIZE_2X = 2,
IEEE80211_RADIOTAP_HE_DATA5_LTF_SIZE_4X = 3,
IEEE80211_RADIOTAP_HE_DATA5_NUM_LTF_SYMS = 0x0700,
IEEE80211_RADIOTAP_HE_DATA5_PRE_FEC_PAD = 0x3000,
IEEE80211_RADIOTAP_HE_DATA5_TXBF = 0x4000,
IEEE80211_RADIOTAP_HE_DATA5_PE_DISAMBIG = 0x8000,
IEEE80211_RADIOTAP_HE_DATA6_NSTS = 0x000f,
IEEE80211_RADIOTAP_HE_DATA6_DOPPLER = 0x0010,
IEEE80211_RADIOTAP_HE_DATA6_TB_PPDU_BW_KNOWN = 0x0020,
IEEE80211_RADIOTAP_HE_DATA6_TB_PPDU_BW = 0x00c0,
IEEE80211_RADIOTAP_HE_DATA6_TB_PPDU_BW_20MHZ = 0,
IEEE80211_RADIOTAP_HE_DATA6_TB_PPDU_BW_40MHZ = 1,
IEEE80211_RADIOTAP_HE_DATA6_TB_PPDU_BW_80MHZ = 2,
IEEE80211_RADIOTAP_HE_DATA6_TB_PPDU_BW_160MHZ = 3,
IEEE80211_RADIOTAP_HE_DATA6_TXOP = 0x7f00,
IEEE80211_RADIOTAP_HE_DATA6_MIDAMBLE_PDCTY = 0x8000,
};
struct ieee80211_radiotap_he_mu {
__le16 flags1, flags2;
u8 ru_ch1[4];
u8 ru_ch2[4];
};
enum ieee80211_radiotap_he_mu_bits {
IEEE80211_RADIOTAP_HE_MU_FLAGS1_SIG_B_MCS = 0x000f,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_SIG_B_MCS_KNOWN = 0x0010,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_SIG_B_DCM = 0x0020,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_SIG_B_DCM_KNOWN = 0x0040,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_CH2_CTR_26T_RU_KNOWN = 0x0080,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_CH1_RU_KNOWN = 0x0100,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_CH2_RU_KNOWN = 0x0200,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_CH1_CTR_26T_RU_KNOWN = 0x1000,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_CH1_CTR_26T_RU = 0x2000,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_SIG_B_COMP_KNOWN = 0x4000,
IEEE80211_RADIOTAP_HE_MU_FLAGS1_SIG_B_SYMS_USERS_KNOWN = 0x8000,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_BW_FROM_SIG_A_BW = 0x0003,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_BW_FROM_SIG_A_BW_20MHZ = 0x0000,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_BW_FROM_SIG_A_BW_40MHZ = 0x0001,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_BW_FROM_SIG_A_BW_80MHZ = 0x0002,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_BW_FROM_SIG_A_BW_160MHZ = 0x0003,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_BW_FROM_SIG_A_BW_KNOWN = 0x0004,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_SIG_B_COMP = 0x0008,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_SIG_B_SYMS_USERS = 0x00f0,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_PUNC_FROM_SIG_A_BW = 0x0300,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_PUNC_FROM_SIG_A_BW_KNOWN= 0x0400,
IEEE80211_RADIOTAP_HE_MU_FLAGS2_CH2_CTR_26T_RU = 0x0800,
};
enum ieee80211_radiotap_lsig_data1 {
IEEE80211_RADIOTAP_LSIG_DATA1_RATE_KNOWN = 0x0001,
IEEE80211_RADIOTAP_LSIG_DATA1_LENGTH_KNOWN = 0x0002,
};
enum ieee80211_radiotap_lsig_data2 {
IEEE80211_RADIOTAP_LSIG_DATA2_RATE = 0x000f,
IEEE80211_RADIOTAP_LSIG_DATA2_LENGTH = 0xfff0,
};
struct ieee80211_radiotap_lsig {
__le16 data1, data2;
};
enum ieee80211_radiotap_zero_len_psdu_type {
IEEE80211_RADIOTAP_ZERO_LEN_PSDU_SOUNDING = 0,
IEEE80211_RADIOTAP_ZERO_LEN_PSDU_NOT_CAPTURED = 1,
IEEE80211_RADIOTAP_ZERO_LEN_PSDU_VENDOR = 0xff,
};
/**
* ieee80211_get_radiotap_len - get radiotap header length
*/
static inline u16 ieee80211_get_radiotap_len(const char *data)
{
struct ieee80211_radiotap_header *hdr = (void *)data;
return get_unaligned_le16(&hdr->it_len);
}
#endif /* __RADIOTAP_H */
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