tcp

Documentation

Index

• Constants
• type Header
  • func (h Header) ACK() bool
  • func (h Header) AckNumber() uint32
  • func (h Header) AppendFlags(b *bytes.Buffer)
  • func (h Header) CWR() bool
  • func (h Header) Checksum() uint16
  • func (h Header) DataOffset() int
  • func (h Header) DestinationPort() uint16
  • func (h Header) ECE() bool
  • func (h Header) FIN() bool
  • func (h Header) NS() bool
  • func (h Header) NoFlags() bool
  • func (h Header) OptionBytes() []byte
  • func (h Header) PSH() bool
  • func (h Header) Payload() []byte
  • func (h Header) RST() bool
  • func (h Header) SYN() bool
  • func (h Header) Sequence() uint32
  • func (h Header) SetACK(flag bool)
  • func (h Header) SetAckNumber(aq uint32)
  • func (h Header) SetCWR(flag bool)
  • func (h Header) SetChecksum(ipHdr ip.Header)
  • func (h Header) SetDataOffset(offset int)
  • func (h Header) SetDestinationPort(port uint16)
  • func (h Header) SetECE(flag bool)
  • func (h Header) SetFIN(flag bool)
  • func (h Header) SetNS(flag bool)
  • func (h Header) SetPSH(flag bool)
  • func (h Header) SetRST(flag bool)
  • func (h Header) SetSYN(flag bool)
  • func (h Header) SetSequence(sq uint32)
  • func (h Header) SetSourcePort(port uint16)
  • func (h Header) SetURG(flag bool)
  • func (h Header) SetUrgentPointer(up uint16)
  • func (h Header) SetWindowSize(sz uint16)
  • func (h Header) SourcePort() uint16
  • func (h Header) URG() bool
  • func (h Header) UrgentPointer() uint16
  • func (h Header) WindowSize() uint16
• type Packet
  • func NewPacket(ipPayloadLen int, src, dst net.IP, withAck bool) Packet
  • func PacketFromData(ipHdr ip.Header, data *buffer.Data) Packet
• type PacketHandler
  • func NewHandler(streamCreator StreamCreator, dispatcherClosing *int32, toTun ip.Writer, ...) PacketHandler
• type StreamCreator

Constants

const HeaderLen = 20

HeaderLen is the length of a TCP header that doesn't have any options

const HeaderMaxLen = 60

Types

type Header

type Header []byte

Header represents a TCP header. The header is obtained by simply casting the IP header's payload.

func (Header) ACK

func (h Header) ACK() bool

func (Header) AckNumber

func (h Header) AckNumber() uint32

func (Header) AppendFlags

func (h Header) AppendFlags(b *bytes.Buffer)

AppendFlags appends a comma separated list of all flags that are currently set.

func (Header) CWR

func (h Header) CWR() bool

func (Header) Checksum

func (h Header) Checksum() uint16

func (Header) DataOffset

func (h Header) DataOffset() int

func (Header) DestinationPort

func (h Header) DestinationPort() uint16

func (Header) ECE

func (h Header) ECE() bool

func (Header) FIN

func (h Header) FIN() bool

func (Header) NS

func (h Header) NS() bool

func (Header) NoFlags

func (h Header) NoFlags() bool

func (Header) OptionBytes

func (h Header) OptionBytes() []byte

func (Header) PSH

func (h Header) PSH() bool

func (Header) Payload

func (h Header) Payload() []byte

func (Header) RST

func (h Header) RST() bool

func (Header) SYN

func (h Header) SYN() bool

func (Header) Sequence

func (h Header) Sequence() uint32

func (Header) SetACK

func (h Header) SetACK(flag bool)

func (Header) SetAckNumber

func (h Header) SetAckNumber(aq uint32)

func (Header) SetCWR

func (h Header) SetCWR(flag bool)

func (Header) SetChecksum

func (h Header) SetChecksum(ipHdr ip.Header)

func (Header) SetDataOffset

func (h Header) SetDataOffset(offset int)

func (Header) SetDestinationPort

func (h Header) SetDestinationPort(port uint16)

func (Header) SetECE

func (h Header) SetECE(flag bool)

func (Header) SetFIN

func (h Header) SetFIN(flag bool)

func (Header) SetNS

func (h Header) SetNS(flag bool)

func (Header) SetPSH

func (h Header) SetPSH(flag bool)

func (Header) SetRST

func (h Header) SetRST(flag bool)

func (Header) SetSYN

func (h Header) SetSYN(flag bool)

func (Header) SetSequence

func (h Header) SetSequence(sq uint32)

func (Header) SetSourcePort

func (h Header) SetSourcePort(port uint16)

func (Header) SetURG

func (h Header) SetURG(flag bool)

func (Header) SetUrgentPointer

func (h Header) SetUrgentPointer(up uint16)

func (Header) SetWindowSize

func (h Header) SetWindowSize(sz uint16)

func (Header) SourcePort

func (h Header) SourcePort() uint16

func (Header) URG

func (h Header) URG() bool

func (Header) UrgentPointer

func (h Header) UrgentPointer() uint16

func (Header) WindowSize

func (h Header) WindowSize() uint16

type Packet

type Packet interface {
	ip.Packet
	Header() Header
	PayloadLen() int
	Reset() Packet
}

func NewPacket

func NewPacket(ipPayloadLen int, src, dst net.IP, withAck bool) Packet

func PacketFromData

func PacketFromData(ipHdr ip.Header, data *buffer.Data) Packet

type PacketHandler

type PacketHandler interface {
	tunnel.Handler

	// HandlePacket handles a packet that was read from the TUN device
	HandlePacket(ctx context.Context, pkt Packet)
}

func NewHandler

func NewHandler(
	streamCreator StreamCreator,
	dispatcherClosing *int32,
	toTun ip.Writer,
	id tunnel.ConnID,
	remove func(),
	rndSource rand.Source,
) PacketHandler

type StreamCreator

type StreamCreator func(ctx context.Context) (tunnel.Stream, error)