diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/radiotap.go')
| -rw-r--r-- | vendor/github.com/google/gopacket/layers/radiotap.go | 1045 |
1 files changed, 0 insertions, 1045 deletions
diff --git a/vendor/github.com/google/gopacket/layers/radiotap.go b/vendor/github.com/google/gopacket/layers/radiotap.go deleted file mode 100644 index 4304e75..0000000 --- a/vendor/github.com/google/gopacket/layers/radiotap.go +++ /dev/null @@ -1,1045 +0,0 @@ -// 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:] - if !m.Flags.FCS() { // Dot11.DecodeFromBytes() expects FCS present - fcs := make([]byte, 4) - h := crc32.NewIEEE() - h.Write(payload) - binary.LittleEndian.PutUint32(fcs, h.Sum32()) - payload = append(payload, fcs...) - } - 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 } |