l4

Documentation

Index

• Constants
• func CalcCSum(h L4Header, addr, pld common.RawBytes) (common.RawBytes, error)
• func CheckCSum(h L4Header, addr, pld common.RawBytes) error
• func SetCSum(h L4Header, addr, pld common.RawBytes) error
• type L4Header
• type TCP
  • func (t *TCP) String() string
• type UDP
  • func UDPFromRaw(b common.RawBytes) (*UDP, error)
  • func (u *UDP) Copy() L4Header
  • func (u *UDP) GetCSum() common.RawBytes
  • func (u *UDP) L4Len() int
  • func (u *UDP) L4Type() common.L4ProtocolType
  • func (u *UDP) Pack(csum bool) (common.RawBytes, error)
  • func (u *UDP) Parse(b common.RawBytes) error
  • func (u *UDP) Reverse()
  • func (u *UDP) SetCSum(csum common.RawBytes)
  • func (u *UDP) SetPldLen(pldLen int)
  • func (u *UDP) String() string
  • func (u *UDP) Validate(plen int) error
  • func (u *UDP) Write(b common.RawBytes) error

Constants

const ErrInvalidChksum common.ErrMsg = "Invalid L4 checksum"

const (
	UDPLen = 8
)

Functions

func CalcCSum

func CalcCSum(h L4Header, addr, pld common.RawBytes) (common.RawBytes, error)

func CheckCSum

func CheckCSum(h L4Header, addr, pld common.RawBytes) error

func SetCSum

func SetCSum(h L4Header, addr, pld common.RawBytes) error

Types

type L4Header

type L4Header interface {
	fmt.Stringer
	L4Type() common.L4ProtocolType
	L4Len() int
	SetPldLen(int)
	GetCSum() common.RawBytes
	SetCSum(common.RawBytes)
	Copy() L4Header
	Write(common.RawBytes) error
	Pack(csum bool) (common.RawBytes, error)
	Validate(plen int) error
	Reverse()
}

type TCP

type TCP struct{}

func (*TCP) String

func (t *TCP) String() string

type UDP

type UDP struct {
	SrcPort  uint16
	DstPort  uint16
	TotalLen uint16
	Checksum common.RawBytes `struct:"[2]byte"`
}

func UDPFromRaw

func UDPFromRaw(b common.RawBytes) (*UDP, error)

func (*UDP) Copy

func (u *UDP) Copy() L4Header

func (*UDP) GetCSum

func (u *UDP) GetCSum() common.RawBytes

func (*UDP) L4Len

func (u *UDP) L4Len() int

func (*UDP) L4Type

func (u *UDP) L4Type() common.L4ProtocolType

func (*UDP) Pack

func (u *UDP) Pack(csum bool) (common.RawBytes, error)

func (*UDP) Parse

func (u *UDP) Parse(b common.RawBytes) error

func (*UDP) Reverse

func (u *UDP) Reverse()

func (*UDP) SetCSum

func (u *UDP) SetCSum(csum common.RawBytes)

func (*UDP) SetPldLen

func (u *UDP) SetPldLen(pldLen int)

func (*UDP) String

func (u *UDP) String() string

func (*UDP) Validate

func (u *UDP) Validate(plen int) error

func (*UDP) Write

func (u *UDP) Write(b common.RawBytes) error