diff --git a/vendor/github.com/google/gopacket/layers/radiotap.go b/vendor/github.com/google/gopacket/layers/radiotap.go
new file mode 100644
index 0000000..17c6133
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/radiotap.go
@@ -0,0 +1,1069 @@
+// Copyright 2014 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"hash/crc32"
+	"strings"
+
+	"github.com/google/gopacket"
+)
+
+// align calculates the number of bytes needed to align with the width
+// on the offset, returning the number of bytes we need to skip to
+// align to the offset (width).
+func align(offset uint16, width uint16) uint16 {
+	return ((((offset) + ((width) - 1)) & (^((width) - 1))) - offset)
+}
+
+type RadioTapPresent uint32
+
+const (
+	RadioTapPresentTSFT RadioTapPresent = 1 << iota
+	RadioTapPresentFlags
+	RadioTapPresentRate
+	RadioTapPresentChannel
+	RadioTapPresentFHSS
+	RadioTapPresentDBMAntennaSignal
+	RadioTapPresentDBMAntennaNoise
+	RadioTapPresentLockQuality
+	RadioTapPresentTxAttenuation
+	RadioTapPresentDBTxAttenuation
+	RadioTapPresentDBMTxPower
+	RadioTapPresentAntenna
+	RadioTapPresentDBAntennaSignal
+	RadioTapPresentDBAntennaNoise
+	RadioTapPresentRxFlags
+	RadioTapPresentTxFlags
+	RadioTapPresentRtsRetries
+	RadioTapPresentDataRetries
+	_
+	RadioTapPresentMCS
+	RadioTapPresentAMPDUStatus
+	RadioTapPresentVHT
+	RadioTapPresentEXT RadioTapPresent = 1 << 31
+)
+
+func (r RadioTapPresent) TSFT() bool {
+	return r&RadioTapPresentTSFT != 0
+}
+func (r RadioTapPresent) Flags() bool {
+	return r&RadioTapPresentFlags != 0
+}
+func (r RadioTapPresent) Rate() bool {
+	return r&RadioTapPresentRate != 0
+}
+func (r RadioTapPresent) Channel() bool {
+	return r&RadioTapPresentChannel != 0
+}
+func (r RadioTapPresent) FHSS() bool {
+	return r&RadioTapPresentFHSS != 0
+}
+func (r RadioTapPresent) DBMAntennaSignal() bool {
+	return r&RadioTapPresentDBMAntennaSignal != 0
+}
+func (r RadioTapPresent) DBMAntennaNoise() bool {
+	return r&RadioTapPresentDBMAntennaNoise != 0
+}
+func (r RadioTapPresent) LockQuality() bool {
+	return r&RadioTapPresentLockQuality != 0
+}
+func (r RadioTapPresent) TxAttenuation() bool {
+	return r&RadioTapPresentTxAttenuation != 0
+}
+func (r RadioTapPresent) DBTxAttenuation() bool {
+	return r&RadioTapPresentDBTxAttenuation != 0
+}
+func (r RadioTapPresent) DBMTxPower() bool {
+	return r&RadioTapPresentDBMTxPower != 0
+}
+func (r RadioTapPresent) Antenna() bool {
+	return r&RadioTapPresentAntenna != 0
+}
+func (r RadioTapPresent) DBAntennaSignal() bool {
+	return r&RadioTapPresentDBAntennaSignal != 0
+}
+func (r RadioTapPresent) DBAntennaNoise() bool {
+	return r&RadioTapPresentDBAntennaNoise != 0
+}
+func (r RadioTapPresent) RxFlags() bool {
+	return r&RadioTapPresentRxFlags != 0
+}
+func (r RadioTapPresent) TxFlags() bool {
+	return r&RadioTapPresentTxFlags != 0
+}
+func (r RadioTapPresent) RtsRetries() bool {
+	return r&RadioTapPresentRtsRetries != 0
+}
+func (r RadioTapPresent) DataRetries() bool {
+	return r&RadioTapPresentDataRetries != 0
+}
+func (r RadioTapPresent) MCS() bool {
+	return r&RadioTapPresentMCS != 0
+}
+func (r RadioTapPresent) AMPDUStatus() bool {
+	return r&RadioTapPresentAMPDUStatus != 0
+}
+func (r RadioTapPresent) VHT() bool {
+	return r&RadioTapPresentVHT != 0
+}
+func (r RadioTapPresent) EXT() bool {
+	return r&RadioTapPresentEXT != 0
+}
+
+type RadioTapChannelFlags uint16
+
+const (
+	RadioTapChannelFlagsTurbo   RadioTapChannelFlags = 0x0010 // Turbo channel
+	RadioTapChannelFlagsCCK     RadioTapChannelFlags = 0x0020 // CCK channel
+	RadioTapChannelFlagsOFDM    RadioTapChannelFlags = 0x0040 // OFDM channel
+	RadioTapChannelFlagsGhz2    RadioTapChannelFlags = 0x0080 // 2 GHz spectrum channel.
+	RadioTapChannelFlagsGhz5    RadioTapChannelFlags = 0x0100 // 5 GHz spectrum channel
+	RadioTapChannelFlagsPassive RadioTapChannelFlags = 0x0200 // Only passive scan allowed
+	RadioTapChannelFlagsDynamic RadioTapChannelFlags = 0x0400 // Dynamic CCK-OFDM channel
+	RadioTapChannelFlagsGFSK    RadioTapChannelFlags = 0x0800 // GFSK channel (FHSS PHY)
+)
+
+func (r RadioTapChannelFlags) Turbo() bool {
+	return r&RadioTapChannelFlagsTurbo != 0
+}
+func (r RadioTapChannelFlags) CCK() bool {
+	return r&RadioTapChannelFlagsCCK != 0
+}
+func (r RadioTapChannelFlags) OFDM() bool {
+	return r&RadioTapChannelFlagsOFDM != 0
+}
+func (r RadioTapChannelFlags) Ghz2() bool {
+	return r&RadioTapChannelFlagsGhz2 != 0
+}
+func (r RadioTapChannelFlags) Ghz5() bool {
+	return r&RadioTapChannelFlagsGhz5 != 0
+}
+func (r RadioTapChannelFlags) Passive() bool {
+	return r&RadioTapChannelFlagsPassive != 0
+}
+func (r RadioTapChannelFlags) Dynamic() bool {
+	return r&RadioTapChannelFlagsDynamic != 0
+}
+func (r RadioTapChannelFlags) GFSK() bool {
+	return r&RadioTapChannelFlagsGFSK != 0
+}
+
+// String provides a human readable string for RadioTapChannelFlags.
+// This string is possibly subject to change over time; if you're storing this
+// persistently, you should probably store the RadioTapChannelFlags value, not its string.
+func (a RadioTapChannelFlags) String() string {
+	var out bytes.Buffer
+	if a.Turbo() {
+		out.WriteString("Turbo,")
+	}
+	if a.CCK() {
+		out.WriteString("CCK,")
+	}
+	if a.OFDM() {
+		out.WriteString("OFDM,")
+	}
+	if a.Ghz2() {
+		out.WriteString("Ghz2,")
+	}
+	if a.Ghz5() {
+		out.WriteString("Ghz5,")
+	}
+	if a.Passive() {
+		out.WriteString("Passive,")
+	}
+	if a.Dynamic() {
+		out.WriteString("Dynamic,")
+	}
+	if a.GFSK() {
+		out.WriteString("GFSK,")
+	}
+
+	if length := out.Len(); length > 0 {
+		return string(out.Bytes()[:length-1]) // strip final comma
+	}
+	return ""
+}
+
+type RadioTapFlags uint8
+
+const (
+	RadioTapFlagsCFP           RadioTapFlags = 1 << iota // sent/received during CFP
+	RadioTapFlagsShortPreamble                           // sent/received * with short * preamble
+	RadioTapFlagsWEP                                     // sent/received * with WEP encryption
+	RadioTapFlagsFrag                                    // sent/received * with fragmentation
+	RadioTapFlagsFCS                                     // frame includes FCS
+	RadioTapFlagsDatapad                                 // frame has padding between * 802.11 header and payload * (to 32-bit boundary)
+	RadioTapFlagsBadFCS                                  // does not pass FCS check
+	RadioTapFlagsShortGI                                 // HT short GI
+)
+
+func (r RadioTapFlags) CFP() bool {
+	return r&RadioTapFlagsCFP != 0
+}
+func (r RadioTapFlags) ShortPreamble() bool {
+	return r&RadioTapFlagsShortPreamble != 0
+}
+func (r RadioTapFlags) WEP() bool {
+	return r&RadioTapFlagsWEP != 0
+}
+func (r RadioTapFlags) Frag() bool {
+	return r&RadioTapFlagsFrag != 0
+}
+func (r RadioTapFlags) FCS() bool {
+	return r&RadioTapFlagsFCS != 0
+}
+func (r RadioTapFlags) Datapad() bool {
+	return r&RadioTapFlagsDatapad != 0
+}
+func (r RadioTapFlags) BadFCS() bool {
+	return r&RadioTapFlagsBadFCS != 0
+}
+func (r RadioTapFlags) ShortGI() bool {
+	return r&RadioTapFlagsShortGI != 0
+}
+
+// String provides a human readable string for RadioTapFlags.
+// This string is possibly subject to change over time; if you're storing this
+// persistently, you should probably store the RadioTapFlags value, not its string.
+func (a RadioTapFlags) String() string {
+	var out bytes.Buffer
+	if a.CFP() {
+		out.WriteString("CFP,")
+	}
+	if a.ShortPreamble() {
+		out.WriteString("SHORT-PREAMBLE,")
+	}
+	if a.WEP() {
+		out.WriteString("WEP,")
+	}
+	if a.Frag() {
+		out.WriteString("FRAG,")
+	}
+	if a.FCS() {
+		out.WriteString("FCS,")
+	}
+	if a.Datapad() {
+		out.WriteString("DATAPAD,")
+	}
+	if a.ShortGI() {
+		out.WriteString("SHORT-GI,")
+	}
+
+	if length := out.Len(); length > 0 {
+		return string(out.Bytes()[:length-1]) // strip final comma
+	}
+	return ""
+}
+
+type RadioTapRate uint8
+
+func (a RadioTapRate) String() string {
+	return fmt.Sprintf("%v Mb/s", 0.5*float32(a))
+}
+
+type RadioTapChannelFrequency uint16
+
+func (a RadioTapChannelFrequency) String() string {
+	return fmt.Sprintf("%d MHz", a)
+}
+
+type RadioTapRxFlags uint16
+
+const (
+	RadioTapRxFlagsBadPlcp RadioTapRxFlags = 0x0002
+)
+
+func (self RadioTapRxFlags) BadPlcp() bool {
+	return self&RadioTapRxFlagsBadPlcp != 0
+}
+
+func (self RadioTapRxFlags) String() string {
+	if self.BadPlcp() {
+		return "BADPLCP"
+	}
+	return ""
+}
+
+type RadioTapTxFlags uint16
+
+const (
+	RadioTapTxFlagsFail RadioTapTxFlags = 1 << iota
+	RadioTapTxFlagsCTS
+	RadioTapTxFlagsRTS
+	RadioTapTxFlagsNoACK
+)
+
+func (self RadioTapTxFlags) Fail() bool  { return self&RadioTapTxFlagsFail != 0 }
+func (self RadioTapTxFlags) CTS() bool   { return self&RadioTapTxFlagsCTS != 0 }
+func (self RadioTapTxFlags) RTS() bool   { return self&RadioTapTxFlagsRTS != 0 }
+func (self RadioTapTxFlags) NoACK() bool { return self&RadioTapTxFlagsNoACK != 0 }
+
+func (self RadioTapTxFlags) String() string {
+	var tokens []string
+	if self.Fail() {
+		tokens = append(tokens, "Fail")
+	}
+	if self.CTS() {
+		tokens = append(tokens, "CTS")
+	}
+	if self.RTS() {
+		tokens = append(tokens, "RTS")
+	}
+	if self.NoACK() {
+		tokens = append(tokens, "NoACK")
+	}
+	return strings.Join(tokens, ",")
+}
+
+type RadioTapMCS struct {
+	Known RadioTapMCSKnown
+	Flags RadioTapMCSFlags
+	MCS   uint8
+}
+
+func (self RadioTapMCS) String() string {
+	var tokens []string
+	if self.Known.Bandwidth() {
+		token := "?"
+		switch self.Flags.Bandwidth() {
+		case 0:
+			token = "20"
+		case 1:
+			token = "40"
+		case 2:
+			token = "40(20L)"
+		case 3:
+			token = "40(20U)"
+		}
+		tokens = append(tokens, token)
+	}
+	if self.Known.MCSIndex() {
+		tokens = append(tokens, fmt.Sprintf("MCSIndex#%d", self.MCS))
+	}
+	if self.Known.GuardInterval() {
+		if self.Flags.ShortGI() {
+			tokens = append(tokens, fmt.Sprintf("shortGI"))
+		} else {
+			tokens = append(tokens, fmt.Sprintf("longGI"))
+		}
+	}
+	if self.Known.HTFormat() {
+		if self.Flags.Greenfield() {
+			tokens = append(tokens, fmt.Sprintf("HT-greenfield"))
+		} else {
+			tokens = append(tokens, fmt.Sprintf("HT-mixed"))
+		}
+	}
+	if self.Known.FECType() {
+		if self.Flags.FECLDPC() {
+			tokens = append(tokens, fmt.Sprintf("LDPC"))
+		} else {
+			tokens = append(tokens, fmt.Sprintf("BCC"))
+		}
+	}
+	if self.Known.STBC() {
+		tokens = append(tokens, fmt.Sprintf("STBC#%d", self.Flags.STBC()))
+	}
+	if self.Known.NESS() {
+		num := 0
+		if self.Known.NESS1() {
+			num |= 0x02
+		}
+		if self.Flags.NESS0() {
+			num |= 0x01
+		}
+		tokens = append(tokens, fmt.Sprintf("num-of-ESS#%d", num))
+	}
+	return strings.Join(tokens, ",")
+}
+
+type RadioTapMCSKnown uint8
+
+const (
+	RadioTapMCSKnownBandwidth RadioTapMCSKnown = 1 << iota
+	RadioTapMCSKnownMCSIndex
+	RadioTapMCSKnownGuardInterval
+	RadioTapMCSKnownHTFormat
+	RadioTapMCSKnownFECType
+	RadioTapMCSKnownSTBC
+	RadioTapMCSKnownNESS
+	RadioTapMCSKnownNESS1
+)
+
+func (self RadioTapMCSKnown) Bandwidth() bool     { return self&RadioTapMCSKnownBandwidth != 0 }
+func (self RadioTapMCSKnown) MCSIndex() bool      { return self&RadioTapMCSKnownMCSIndex != 0 }
+func (self RadioTapMCSKnown) GuardInterval() bool { return self&RadioTapMCSKnownGuardInterval != 0 }
+func (self RadioTapMCSKnown) HTFormat() bool      { return self&RadioTapMCSKnownHTFormat != 0 }
+func (self RadioTapMCSKnown) FECType() bool       { return self&RadioTapMCSKnownFECType != 0 }
+func (self RadioTapMCSKnown) STBC() bool          { return self&RadioTapMCSKnownSTBC != 0 }
+func (self RadioTapMCSKnown) NESS() bool          { return self&RadioTapMCSKnownNESS != 0 }
+func (self RadioTapMCSKnown) NESS1() bool         { return self&RadioTapMCSKnownNESS1 != 0 }
+
+type RadioTapMCSFlags uint8
+
+const (
+	RadioTapMCSFlagsBandwidthMask RadioTapMCSFlags = 0x03
+	RadioTapMCSFlagsShortGI                        = 0x04
+	RadioTapMCSFlagsGreenfield                     = 0x08
+	RadioTapMCSFlagsFECLDPC                        = 0x10
+	RadioTapMCSFlagsSTBCMask                       = 0x60
+	RadioTapMCSFlagsNESS0                          = 0x80
+)
+
+func (self RadioTapMCSFlags) Bandwidth() int {
+	return int(self & RadioTapMCSFlagsBandwidthMask)
+}
+func (self RadioTapMCSFlags) ShortGI() bool    { return self&RadioTapMCSFlagsShortGI != 0 }
+func (self RadioTapMCSFlags) Greenfield() bool { return self&RadioTapMCSFlagsGreenfield != 0 }
+func (self RadioTapMCSFlags) FECLDPC() bool    { return self&RadioTapMCSFlagsFECLDPC != 0 }
+func (self RadioTapMCSFlags) STBC() int {
+	return int(self&RadioTapMCSFlagsSTBCMask) >> 5
+}
+func (self RadioTapMCSFlags) NESS0() bool { return self&RadioTapMCSFlagsNESS0 != 0 }
+
+type RadioTapAMPDUStatus struct {
+	Reference uint32
+	Flags     RadioTapAMPDUStatusFlags
+	CRC       uint8
+}
+
+func (self RadioTapAMPDUStatus) String() string {
+	tokens := []string{
+		fmt.Sprintf("ref#%x", self.Reference),
+	}
+	if self.Flags.ReportZerolen() && self.Flags.IsZerolen() {
+		tokens = append(tokens, fmt.Sprintf("zero-length"))
+	}
+	if self.Flags.LastKnown() && self.Flags.IsLast() {
+		tokens = append(tokens, "last")
+	}
+	if self.Flags.DelimCRCErr() {
+		tokens = append(tokens, "delimiter CRC error")
+	}
+	if self.Flags.DelimCRCKnown() {
+		tokens = append(tokens, fmt.Sprintf("delimiter-CRC=%02x", self.CRC))
+	}
+	return strings.Join(tokens, ",")
+}
+
+type RadioTapAMPDUStatusFlags uint16
+
+const (
+	RadioTapAMPDUStatusFlagsReportZerolen RadioTapAMPDUStatusFlags = 1 << iota
+	RadioTapAMPDUIsZerolen
+	RadioTapAMPDULastKnown
+	RadioTapAMPDUIsLast
+	RadioTapAMPDUDelimCRCErr
+	RadioTapAMPDUDelimCRCKnown
+)
+
+func (self RadioTapAMPDUStatusFlags) ReportZerolen() bool {
+	return self&RadioTapAMPDUStatusFlagsReportZerolen != 0
+}
+func (self RadioTapAMPDUStatusFlags) IsZerolen() bool     { return self&RadioTapAMPDUIsZerolen != 0 }
+func (self RadioTapAMPDUStatusFlags) LastKnown() bool     { return self&RadioTapAMPDULastKnown != 0 }
+func (self RadioTapAMPDUStatusFlags) IsLast() bool        { return self&RadioTapAMPDUIsLast != 0 }
+func (self RadioTapAMPDUStatusFlags) DelimCRCErr() bool   { return self&RadioTapAMPDUDelimCRCErr != 0 }
+func (self RadioTapAMPDUStatusFlags) DelimCRCKnown() bool { return self&RadioTapAMPDUDelimCRCKnown != 0 }
+
+type RadioTapVHT struct {
+	Known      RadioTapVHTKnown
+	Flags      RadioTapVHTFlags
+	Bandwidth  uint8
+	MCSNSS     [4]RadioTapVHTMCSNSS
+	Coding     uint8
+	GroupId    uint8
+	PartialAID uint16
+}
+
+func (self RadioTapVHT) String() string {
+	var tokens []string
+	if self.Known.STBC() {
+		if self.Flags.STBC() {
+			tokens = append(tokens, "STBC")
+		} else {
+			tokens = append(tokens, "no STBC")
+		}
+	}
+	if self.Known.TXOPPSNotAllowed() {
+		if self.Flags.TXOPPSNotAllowed() {
+			tokens = append(tokens, "TXOP doze not allowed")
+		} else {
+			tokens = append(tokens, "TXOP doze allowed")
+		}
+	}
+	if self.Known.GI() {
+		if self.Flags.SGI() {
+			tokens = append(tokens, "short GI")
+		} else {
+			tokens = append(tokens, "long GI")
+		}
+	}
+	if self.Known.SGINSYMDisambiguation() {
+		if self.Flags.SGINSYMMod() {
+			tokens = append(tokens, "NSYM mod 10=9")
+		} else {
+			tokens = append(tokens, "NSYM mod 10!=9 or no short GI")
+		}
+	}
+	if self.Known.LDPCExtraOFDMSymbol() {
+		if self.Flags.LDPCExtraOFDMSymbol() {
+			tokens = append(tokens, "LDPC extra OFDM symbols")
+		} else {
+			tokens = append(tokens, "no LDPC extra OFDM symbols")
+		}
+	}
+	if self.Known.Beamformed() {
+		if self.Flags.Beamformed() {
+			tokens = append(tokens, "beamformed")
+		} else {
+			tokens = append(tokens, "no beamformed")
+		}
+	}
+	if self.Known.Bandwidth() {
+		token := "?"
+		switch self.Bandwidth & 0x1f {
+		case 0:
+			token = "20"
+		case 1:
+			token = "40"
+		case 2:
+			token = "40(20L)"
+		case 3:
+			token = "40(20U)"
+		case 4:
+			token = "80"
+		case 5:
+			token = "80(40L)"
+		case 6:
+			token = "80(40U)"
+		case 7:
+			token = "80(20LL)"
+		case 8:
+			token = "80(20LU)"
+		case 9:
+			token = "80(20UL)"
+		case 10:
+			token = "80(20UU)"
+		case 11:
+			token = "160"
+		case 12:
+			token = "160(80L)"
+		case 13:
+			token = "160(80U)"
+		case 14:
+			token = "160(40LL)"
+		case 15:
+			token = "160(40LU)"
+		case 16:
+			token = "160(40UL)"
+		case 17:
+			token = "160(40UU)"
+		case 18:
+			token = "160(20LLL)"
+		case 19:
+			token = "160(20LLU)"
+		case 20:
+			token = "160(20LUL)"
+		case 21:
+			token = "160(20LUU)"
+		case 22:
+			token = "160(20ULL)"
+		case 23:
+			token = "160(20ULU)"
+		case 24:
+			token = "160(20UUL)"
+		case 25:
+			token = "160(20UUU)"
+		}
+		tokens = append(tokens, token)
+	}
+	for i, MCSNSS := range self.MCSNSS {
+		if MCSNSS.Present() {
+			fec := "?"
+			switch self.Coding & (1 << uint8(i)) {
+			case 0:
+				fec = "BCC"
+			case 1:
+				fec = "LDPC"
+			}
+			tokens = append(tokens, fmt.Sprintf("user%d(%s,%s)", i, MCSNSS.String(), fec))
+		}
+	}
+	if self.Known.GroupId() {
+		tokens = append(tokens,
+			fmt.Sprintf("group=%d", self.GroupId))
+	}
+	if self.Known.PartialAID() {
+		tokens = append(tokens,
+			fmt.Sprintf("partial-AID=%d", self.PartialAID))
+	}
+	return strings.Join(tokens, ",")
+}
+
+type RadioTapVHTKnown uint16
+
+const (
+	RadioTapVHTKnownSTBC RadioTapVHTKnown = 1 << iota
+	RadioTapVHTKnownTXOPPSNotAllowed
+	RadioTapVHTKnownGI
+	RadioTapVHTKnownSGINSYMDisambiguation
+	RadioTapVHTKnownLDPCExtraOFDMSymbol
+	RadioTapVHTKnownBeamformed
+	RadioTapVHTKnownBandwidth
+	RadioTapVHTKnownGroupId
+	RadioTapVHTKnownPartialAID
+)
+
+func (self RadioTapVHTKnown) STBC() bool { return self&RadioTapVHTKnownSTBC != 0 }
+func (self RadioTapVHTKnown) TXOPPSNotAllowed() bool {
+	return self&RadioTapVHTKnownTXOPPSNotAllowed != 0
+}
+func (self RadioTapVHTKnown) GI() bool { return self&RadioTapVHTKnownGI != 0 }
+func (self RadioTapVHTKnown) SGINSYMDisambiguation() bool {
+	return self&RadioTapVHTKnownSGINSYMDisambiguation != 0
+}
+func (self RadioTapVHTKnown) LDPCExtraOFDMSymbol() bool {
+	return self&RadioTapVHTKnownLDPCExtraOFDMSymbol != 0
+}
+func (self RadioTapVHTKnown) Beamformed() bool { return self&RadioTapVHTKnownBeamformed != 0 }
+func (self RadioTapVHTKnown) Bandwidth() bool  { return self&RadioTapVHTKnownBandwidth != 0 }
+func (self RadioTapVHTKnown) GroupId() bool    { return self&RadioTapVHTKnownGroupId != 0 }
+func (self RadioTapVHTKnown) PartialAID() bool { return self&RadioTapVHTKnownPartialAID != 0 }
+
+type RadioTapVHTFlags uint8
+
+const (
+	RadioTapVHTFlagsSTBC RadioTapVHTFlags = 1 << iota
+	RadioTapVHTFlagsTXOPPSNotAllowed
+	RadioTapVHTFlagsSGI
+	RadioTapVHTFlagsSGINSYMMod
+	RadioTapVHTFlagsLDPCExtraOFDMSymbol
+	RadioTapVHTFlagsBeamformed
+)
+
+func (self RadioTapVHTFlags) STBC() bool { return self&RadioTapVHTFlagsSTBC != 0 }
+func (self RadioTapVHTFlags) TXOPPSNotAllowed() bool {
+	return self&RadioTapVHTFlagsTXOPPSNotAllowed != 0
+}
+func (self RadioTapVHTFlags) SGI() bool        { return self&RadioTapVHTFlagsSGI != 0 }
+func (self RadioTapVHTFlags) SGINSYMMod() bool { return self&RadioTapVHTFlagsSGINSYMMod != 0 }
+func (self RadioTapVHTFlags) LDPCExtraOFDMSymbol() bool {
+	return self&RadioTapVHTFlagsLDPCExtraOFDMSymbol != 0
+}
+func (self RadioTapVHTFlags) Beamformed() bool { return self&RadioTapVHTFlagsBeamformed != 0 }
+
+type RadioTapVHTMCSNSS uint8
+
+func (self RadioTapVHTMCSNSS) Present() bool {
+	return self&0x0F != 0
+}
+
+func (self RadioTapVHTMCSNSS) String() string {
+	return fmt.Sprintf("NSS#%dMCS#%d", uint32(self&0xf), uint32(self>>4))
+}
+
+func decodeRadioTap(data []byte, p gopacket.PacketBuilder) error {
+	d := &RadioTap{}
+	// TODO: Should we set LinkLayer here? And implement LinkFlow
+	return decodingLayerDecoder(d, data, p)
+}
+
+type RadioTap struct {
+	BaseLayer
+
+	// Version 0. Only increases for drastic changes, introduction of compatible new fields does not count.
+	Version uint8
+	// Length of the whole header in bytes, including it_version, it_pad, it_len, and data fields.
+	Length uint16
+	// Present is a bitmap telling which fields are present. Set bit 31 (0x80000000) to extend the bitmap by another 32 bits. Additional extensions are made by setting bit 31.
+	Present RadioTapPresent
+	// TSFT: value in microseconds of the MAC's 64-bit 802.11 Time Synchronization Function timer when the first bit of the MPDU arrived at the MAC. For received frames, only.
+	TSFT  uint64
+	Flags RadioTapFlags
+	// Rate Tx/Rx data rate
+	Rate RadioTapRate
+	// ChannelFrequency Tx/Rx frequency in MHz, followed by flags
+	ChannelFrequency RadioTapChannelFrequency
+	ChannelFlags     RadioTapChannelFlags
+	// FHSS For frequency-hopping radios, the hop set (first byte) and pattern (second byte).
+	FHSS uint16
+	// DBMAntennaSignal RF signal power at the antenna, decibel difference from one milliwatt.
+	DBMAntennaSignal int8
+	// DBMAntennaNoise RF noise power at the antenna, decibel difference from one milliwatt.
+	DBMAntennaNoise int8
+	// LockQuality Quality of Barker code lock. Unitless. Monotonically nondecreasing with "better" lock strength. Called "Signal Quality" in datasheets.
+	LockQuality uint16
+	// TxAttenuation Transmit power expressed as unitless distance from max power set at factory calibration.  0 is max power. Monotonically nondecreasing with lower power levels.
+	TxAttenuation uint16
+	// DBTxAttenuation Transmit power expressed as decibel distance from max power set at factory calibration.  0 is max power.  Monotonically nondecreasing with lower power levels.
+	DBTxAttenuation uint16
+	// DBMTxPower Transmit power expressed as dBm (decibels from a 1 milliwatt reference). This is the absolute power level measured at the antenna port.
+	DBMTxPower int8
+	// Antenna Unitless indication of the Rx/Tx antenna for this packet. The first antenna is antenna 0.
+	Antenna uint8
+	// DBAntennaSignal RF signal power at the antenna, decibel difference from an arbitrary, fixed reference.
+	DBAntennaSignal uint8
+	// DBAntennaNoise RF noise power at the antenna, decibel difference from an arbitrary, fixed reference point.
+	DBAntennaNoise uint8
+	//
+	RxFlags     RadioTapRxFlags
+	TxFlags     RadioTapTxFlags
+	RtsRetries  uint8
+	DataRetries uint8
+	MCS         RadioTapMCS
+	AMPDUStatus RadioTapAMPDUStatus
+	VHT         RadioTapVHT
+}
+
+func (m *RadioTap) LayerType() gopacket.LayerType { return LayerTypeRadioTap }
+
+func (m *RadioTap) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	m.Version = uint8(data[0])
+	m.Length = binary.LittleEndian.Uint16(data[2:4])
+	m.Present = RadioTapPresent(binary.LittleEndian.Uint32(data[4:8]))
+
+	offset := uint16(4)
+
+	for (binary.LittleEndian.Uint32(data[offset:offset+4]) & 0x80000000) != 0 {
+		// This parser only handles standard radiotap namespace,
+		// and expects all fields are packed in the first it_present.
+		// Extended bitmap will be just ignored.
+		offset += 4
+	}
+	offset += 4 // skip the bitmap
+
+	if m.Present.TSFT() {
+		offset += align(offset, 8)
+		m.TSFT = binary.LittleEndian.Uint64(data[offset : offset+8])
+		offset += 8
+	}
+	if m.Present.Flags() {
+		m.Flags = RadioTapFlags(data[offset])
+		offset++
+	}
+	if m.Present.Rate() {
+		m.Rate = RadioTapRate(data[offset])
+		offset++
+	}
+	if m.Present.Channel() {
+		offset += align(offset, 2)
+		m.ChannelFrequency = RadioTapChannelFrequency(binary.LittleEndian.Uint16(data[offset : offset+2]))
+		offset += 2
+		m.ChannelFlags = RadioTapChannelFlags(binary.LittleEndian.Uint16(data[offset : offset+2]))
+		offset += 2
+	}
+	if m.Present.FHSS() {
+		m.FHSS = binary.LittleEndian.Uint16(data[offset : offset+2])
+		offset += 2
+	}
+	if m.Present.DBMAntennaSignal() {
+		m.DBMAntennaSignal = int8(data[offset])
+		offset++
+	}
+	if m.Present.DBMAntennaNoise() {
+		m.DBMAntennaNoise = int8(data[offset])
+		offset++
+	}
+	if m.Present.LockQuality() {
+		offset += align(offset, 2)
+		m.LockQuality = binary.LittleEndian.Uint16(data[offset : offset+2])
+		offset += 2
+	}
+	if m.Present.TxAttenuation() {
+		offset += align(offset, 2)
+		m.TxAttenuation = binary.LittleEndian.Uint16(data[offset : offset+2])
+		offset += 2
+	}
+	if m.Present.DBTxAttenuation() {
+		offset += align(offset, 2)
+		m.DBTxAttenuation = binary.LittleEndian.Uint16(data[offset : offset+2])
+		offset += 2
+	}
+	if m.Present.DBMTxPower() {
+		m.DBMTxPower = int8(data[offset])
+		offset++
+	}
+	if m.Present.Antenna() {
+		m.Antenna = uint8(data[offset])
+		offset++
+	}
+	if m.Present.DBAntennaSignal() {
+		m.DBAntennaSignal = uint8(data[offset])
+		offset++
+	}
+	if m.Present.DBAntennaNoise() {
+		m.DBAntennaNoise = uint8(data[offset])
+		offset++
+	}
+	if m.Present.RxFlags() {
+		offset += align(offset, 2)
+		m.RxFlags = RadioTapRxFlags(binary.LittleEndian.Uint16(data[offset:]))
+		offset += 2
+	}
+	if m.Present.TxFlags() {
+		offset += align(offset, 2)
+		m.TxFlags = RadioTapTxFlags(binary.LittleEndian.Uint16(data[offset:]))
+		offset += 2
+	}
+	if m.Present.RtsRetries() {
+		m.RtsRetries = uint8(data[offset])
+		offset++
+	}
+	if m.Present.DataRetries() {
+		m.DataRetries = uint8(data[offset])
+		offset++
+	}
+	if m.Present.MCS() {
+		m.MCS = RadioTapMCS{
+			RadioTapMCSKnown(data[offset]),
+			RadioTapMCSFlags(data[offset+1]),
+			uint8(data[offset+2]),
+		}
+		offset += 3
+	}
+	if m.Present.AMPDUStatus() {
+		offset += align(offset, 4)
+		m.AMPDUStatus = RadioTapAMPDUStatus{
+			Reference: binary.LittleEndian.Uint32(data[offset:]),
+			Flags:     RadioTapAMPDUStatusFlags(binary.LittleEndian.Uint16(data[offset+4:])),
+			CRC:       uint8(data[offset+6]),
+		}
+		offset += 8
+	}
+	if m.Present.VHT() {
+		offset += align(offset, 2)
+		m.VHT = RadioTapVHT{
+			Known:     RadioTapVHTKnown(binary.LittleEndian.Uint16(data[offset:])),
+			Flags:     RadioTapVHTFlags(data[offset+2]),
+			Bandwidth: uint8(data[offset+3]),
+			MCSNSS: [4]RadioTapVHTMCSNSS{
+				RadioTapVHTMCSNSS(data[offset+4]),
+				RadioTapVHTMCSNSS(data[offset+5]),
+				RadioTapVHTMCSNSS(data[offset+6]),
+				RadioTapVHTMCSNSS(data[offset+7]),
+			},
+			Coding:     uint8(data[offset+8]),
+			GroupId:    uint8(data[offset+9]),
+			PartialAID: binary.LittleEndian.Uint16(data[offset+10:]),
+		}
+		offset += 12
+	}
+
+	payload := data[m.Length:]
+
+	// Remove non standard padding used by some Wi-Fi drivers
+	if m.Flags.Datapad() &&
+		payload[0]&0xC == 0x8 { //&& // Data frame
+		headlen := 24
+		if payload[0]&0x8C == 0x88 { // QoS
+			headlen += 2
+		}
+		if payload[1]&0x3 == 0x3 { // 4 addresses
+			headlen += 2
+		}
+		if headlen%4 == 2 {
+			payload = append(payload[:headlen], payload[headlen+2:len(payload)]...)
+		}
+	}
+
+	if !m.Flags.FCS() {
+		// Dot11.DecodeFromBytes() expects FCS present and performs a hard chop on the checksum
+		// If a user is handing in subslices or packets from a buffered stream, the capacity of the slice
+		// may extend beyond the len, rather than expecting callers to enforce cap==len on every packet
+		// we take the hit in this one case and do a reallocation.  If the user DOES enforce cap==len
+		// then the reallocation will happen anyway on the append.  This is requried because the append
+		// write to the memory directly after the payload if there is sufficient capacity, which callers
+		// may not expect.
+		reallocPayload := make([]byte, len(payload)+4)
+		copy(reallocPayload[0:len(payload)], payload)
+		h := crc32.NewIEEE()
+		h.Write(payload)
+		binary.LittleEndian.PutUint32(reallocPayload[len(payload):], h.Sum32())
+		payload = reallocPayload
+	}
+	m.BaseLayer = BaseLayer{Contents: data[:m.Length], Payload: payload}
+
+	return nil
+}
+
+func (m RadioTap) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	buf := make([]byte, 1024)
+
+	buf[0] = m.Version
+	buf[1] = 0
+
+	binary.LittleEndian.PutUint32(buf[4:8], uint32(m.Present))
+
+	offset := uint16(4)
+
+	for (binary.LittleEndian.Uint32(buf[offset:offset+4]) & 0x80000000) != 0 {
+		offset += 4
+	}
+
+	offset += 4
+
+	if m.Present.TSFT() {
+		offset += align(offset, 8)
+		binary.LittleEndian.PutUint64(buf[offset:offset+8], m.TSFT)
+		offset += 8
+	}
+
+	if m.Present.Flags() {
+		buf[offset] = uint8(m.Flags)
+		offset++
+	}
+
+	if m.Present.Rate() {
+		buf[offset] = uint8(m.Rate)
+		offset++
+	}
+
+	if m.Present.Channel() {
+		offset += align(offset, 2)
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], uint16(m.ChannelFrequency))
+		offset += 2
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], uint16(m.ChannelFlags))
+		offset += 2
+	}
+
+	if m.Present.FHSS() {
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], m.FHSS)
+		offset += 2
+	}
+
+	if m.Present.DBMAntennaSignal() {
+		buf[offset] = byte(m.DBMAntennaSignal)
+		offset++
+	}
+
+	if m.Present.DBMAntennaNoise() {
+		buf[offset] = byte(m.DBMAntennaNoise)
+		offset++
+	}
+
+	if m.Present.LockQuality() {
+		offset += align(offset, 2)
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], m.LockQuality)
+		offset += 2
+	}
+
+	if m.Present.TxAttenuation() {
+		offset += align(offset, 2)
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], m.TxAttenuation)
+		offset += 2
+	}
+
+	if m.Present.DBTxAttenuation() {
+		offset += align(offset, 2)
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], m.DBTxAttenuation)
+		offset += 2
+	}
+
+	if m.Present.DBMTxPower() {
+		buf[offset] = byte(m.DBMTxPower)
+		offset++
+	}
+
+	if m.Present.Antenna() {
+		buf[offset] = uint8(m.Antenna)
+		offset++
+	}
+
+	if m.Present.DBAntennaSignal() {
+		buf[offset] = uint8(m.DBAntennaSignal)
+		offset++
+	}
+
+	if m.Present.DBAntennaNoise() {
+		buf[offset] = uint8(m.DBAntennaNoise)
+		offset++
+	}
+
+	if m.Present.RxFlags() {
+		offset += align(offset, 2)
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], uint16(m.RxFlags))
+		offset += 2
+	}
+
+	if m.Present.TxFlags() {
+		offset += align(offset, 2)
+		binary.LittleEndian.PutUint16(buf[offset:offset+2], uint16(m.TxFlags))
+		offset += 2
+	}
+
+	if m.Present.RtsRetries() {
+		buf[offset] = m.RtsRetries
+		offset++
+	}
+
+	if m.Present.DataRetries() {
+		buf[offset] = m.DataRetries
+		offset++
+	}
+
+	if m.Present.MCS() {
+		buf[offset] = uint8(m.MCS.Known)
+		buf[offset+1] = uint8(m.MCS.Flags)
+		buf[offset+2] = uint8(m.MCS.MCS)
+
+		offset += 3
+	}
+
+	if m.Present.AMPDUStatus() {
+		offset += align(offset, 4)
+
+		binary.LittleEndian.PutUint32(buf[offset:offset+4], m.AMPDUStatus.Reference)
+		binary.LittleEndian.PutUint16(buf[offset+4:offset+6], uint16(m.AMPDUStatus.Flags))
+
+		buf[offset+6] = m.AMPDUStatus.CRC
+
+		offset += 8
+	}
+
+	if m.Present.VHT() {
+		offset += align(offset, 2)
+
+		binary.LittleEndian.PutUint16(buf[offset:], uint16(m.VHT.Known))
+
+		buf[offset+2] = uint8(m.VHT.Flags)
+		buf[offset+3] = uint8(m.VHT.Bandwidth)
+		buf[offset+4] = uint8(m.VHT.MCSNSS[0])
+		buf[offset+5] = uint8(m.VHT.MCSNSS[1])
+		buf[offset+6] = uint8(m.VHT.MCSNSS[2])
+		buf[offset+7] = uint8(m.VHT.MCSNSS[3])
+		buf[offset+8] = uint8(m.VHT.Coding)
+		buf[offset+9] = uint8(m.VHT.GroupId)
+
+		binary.LittleEndian.PutUint16(buf[offset+10:offset+12], m.VHT.PartialAID)
+
+		offset += 12
+	}
+
+	packetBuf, err := b.PrependBytes(int(offset))
+
+	if err != nil {
+		return err
+	}
+
+	if opts.FixLengths {
+		m.Length = offset
+	}
+
+	binary.LittleEndian.PutUint16(buf[2:4], m.Length)
+
+	copy(packetBuf, buf)
+
+	return nil
+}
+
+func (m *RadioTap) CanDecode() gopacket.LayerClass    { return LayerTypeRadioTap }
+func (m *RadioTap) NextLayerType() gopacket.LayerType { return LayerTypeDot11 }