ipv4

Documentation

Overview

Provides encoding and decoding for IPv4 packets.

Index

• Constants
• func CalculateChecksum(raw_bytes []byte, csum uint32) uint16
• func ProtocolToType(proto Protocol) packet.Type
• type Flags
  • func (f Flags) String() string
• type Packet
  • func Make() *Packet
  • func (p *Packet) Answers(other packet.Packet) bool
  • func (p *Packet) Equals(other packet.Packet) bool
  • func (p *Packet) GetLength() uint16
  • func (p *Packet) GetType() packet.Type
  • func (p *Packet) GuessPayloadType() packet.Type
  • func (p *Packet) InitChecksum(csum uint32)
  • func (p *Packet) Pack(buf *packet.Buffer) error
  • func (p *Packet) Payload() packet.Packet
  • func (p *Packet) SetPayload(pl packet.Packet) error
  • func (p *Packet) String() string
  • func (p *Packet) Unpack(buf *packet.Buffer) error
• type Protocol
  • func TypeToProtocol(pkttype packet.Type) Protocol
  • func (p Protocol) String() string

Constants

const (
	Evil          Flags = 1 << 2 /* RFC3514 */
	DontFragment        = 1 << 1
	MoreFragments       = 1 << 0
)

const (
	None     Protocol = 0x00
	GRE               = 0x2F
	ICMPv4            = 0x01
	ICMPv6            = 0x3A
	IGMP              = 0x02
	IPSecAH           = 0x33
	IPSecESP          = 0x32
	IPv6              = 0x29
	ISIS              = 0x7C
	L2TP              = 0x73
	OSPF              = 0x59
	SCTP              = 0x84
	TCP               = 0x06
	UDP               = 0x11
	UDPLite           = 0x88
)

Functions

func CalculateChecksum

func CalculateChecksum(raw_bytes []byte, csum uint32) uint16

func ProtocolToType

func ProtocolToType(proto Protocol) packet.Type

Create a new Type from the given IP protocol ID.

Types

type Flags

type Flags uint8

func (Flags) String

func (f Flags) String() string

type Packet

type Packet struct {
	Version  uint8
	IHL      uint8
	TOS      uint8  `cmp:"skip"`
	Length   uint16 `cmp:"skip"`
	Id       uint16
	Flags    Flags
	FragOff  uint16
	TTL      uint8    `cmp:"skip"`
	Protocol Protocol `string:"proto"`
	Checksum uint16   `cmp:"skip" string:"sum"`
	SrcAddr  net.IP   `string:"src"`
	DstAddr  net.IP   `string:"dst"`
	// contains filtered or unexported fields
}

func Make

func Make() *Packet

func (*Packet) Answers

func (p *Packet) Answers(other packet.Packet) bool

func (*Packet) Equals

func (p *Packet) Equals(other packet.Packet) bool

func (*Packet) GetLength

func (p *Packet) GetLength() uint16

func (*Packet) GetType

func (p *Packet) GetType() packet.Type

func (*Packet) GuessPayloadType

func (p *Packet) GuessPayloadType() packet.Type

func (*Packet) InitChecksum

func (p *Packet) InitChecksum(csum uint32)

func (*Packet) Pack

func (p *Packet) Pack(buf *packet.Buffer) error

func (*Packet) Payload

func (p *Packet) Payload() packet.Packet

func (*Packet) SetPayload

func (p *Packet) SetPayload(pl packet.Packet) error

func (*Packet) String

func (p *Packet) String() string

func (*Packet) Unpack

func (p *Packet) Unpack(buf *packet.Buffer) error

type Protocol

type Protocol uint8

func TypeToProtocol

func TypeToProtocol(pkttype packet.Type) Protocol

Convert the Type to the corresponding IP protocol ID.

func (Protocol) String

func (p Protocol) String() string