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Add MPTCP Options in the TCP Layer Decoder #870

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1 change: 1 addition & 0 deletions layers/.lint_blacklist
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ linux_sll.go
llc.go
lldp.go
mpls.go
mptcp.go
ndp.go
ntp.go
ospf.go
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161 changes: 161 additions & 0 deletions layers/multipathtcp.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,161 @@
// Copyright 2012 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 (
"fmt"
"net"
)

// MPTCPSubtype represents an MPTCP subtype code.
type MPTCPSubtype uint8

// MPTCP Subtypes constonts from https://www.iana.org/assignments/tcp-parameters/tcp-parameters.xml#mptcp-option-subtypes
const (
MPTCPSubtypeMPCAPABLE = 0x0
MPTCPSubtypeMPJOIN = 0x1
MPTCPSubtypeDSS = 0x2
MPTCPSubtypeADDADDR = 0x3
MPTCPSubtypeREMOVEADDR = 0x4
MPTCPSubtypeMPPRIO = 0x5
MPTCPSubtypeMPFAIL = 0x6
MPTCPSubtypeMPFASTCLOSE = 0x7
MPTCPSubtypeMPTCPRST = 0x8
)

func (k MPTCPSubtype) String() string {
switch k {
case MPTCPSubtypeMPCAPABLE:
return "MP_CAPABLE"
case MPTCPSubtypeMPJOIN:
return "MP_JOIN"
case MPTCPSubtypeDSS:
return "DSS"
case MPTCPSubtypeADDADDR:
return "ADD_ADDR"
case MPTCPSubtypeREMOVEADDR:
return "REMOVE_ADDR"
case MPTCPSubtypeMPPRIO:
return "MP_PRIO"
case MPTCPSubtypeMPFAIL:
return "MP_FAIL"
case MPTCPSubtypeMPFASTCLOSE:
return "MP_FASTCLOSE"
case MPTCPSubtypeMPTCPRST:
return "MP_TCPRST"
default:
return fmt.Sprintf("Unknown(%d)", k)
}
}

const (
MptcpVersion0 = 0
MptcpVersion1 = 1
)

const (
OptionLenMpCapableSyn = 4
OptionLenMpCapableSynAck = 12
OptionLenMpCapableAck = 20
OptionLenMpCapableAckData = 22
OptionLenMpCapableAckDataCSum = 24
OptionLenMpJoinSyn = 12
OptionLenMpJoinSynAck = 16
OptionLenMpJoinAck = 24
OptionLenDssAck = 4
OptionLenDssAck64 = 8
OptionLenDssDSN = 4
OptionLenDssDSN64 = 8
OptionLenDssSSN = 4
OptionLenDssDataLen = 2
OptionLenDssCSum = 2
OptionLenAddAddrv4 = 8
OptionLenAddAddrv6 = 20
OptionLenAddAddrPort = 2
OptionLenAddAddrHmac = 8
OptionLenRemAddr = 4
OptionLenMpPrio = 3
OptionLenMpPrioAddr = 4
OptionLenMpFail = 12
OptionLenMpFClose = 12
OptionLenMpTcpRst = 4
)

// MPCapable contains the fields from the MP_CAPABLE MPTCP Option
type MPCapable struct {
BaseLayer
Version uint8
A, B, C, D, E, F, G, H bool
SendKey []byte
ReceivKey []byte
DataLength uint16
Checksum uint16
}

// MPJoin contains the fields from the MP_JOIN MPTCP Option
type MPJoin struct {
BaseLayer
Backup bool
AddrID uint8
ReceivToken uint32
SendRandNum uint32
SendHMAC []byte
}

// Dss contains the fields from the DSS MPTCP Option
type Dss struct {
BaseLayer
F, m, M, a, A bool
DataAck []byte
DSN []byte
SSN uint32
DataLength uint16
Checksum uint16
}

// AddAddr contains the fields from the ADD_ADDR MPTCP Option
type AddAddr struct {
BaseLayer
IPVer uint8
E bool
AddrID uint8
Address net.IP
Port uint16
SendHMAC []byte
}

// RemAddr contains the fields from the REMOVE_ADDR MPTCP Option
type RemAddr struct {
BaseLayer
AddrIDs []uint8
}

// MPPrio contains the fields from the MP_PRIO MPTCP Option
type MPPrio struct {
BaseLayer
Backup bool
AddrID uint8
}

// MPFail contains the fields from the MP_FAIL MPTCP Option
type MPFail struct {
BaseLayer
DSN uint64
}

// MPFClose contains the fields from the MP_FASTCLOSE MPTCP Option
type MPFClose struct {
BaseLayer
ReceivKey []byte
}

// MPTcpRst contains the fields from the MP_TCPRST MPTCP Option
type MPTcpRst struct {
BaseLayer
U, V, W, T bool
Reason uint8
}
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