ipv4

Documentation

Overview

Copyright 2016-2019 DutchSec (https://dutchsec.com/)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016-2019 DutchSec (https://dutchsec.com/)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

• Constants
• type Header
  • func Parse(b []byte) (*Header, error)
  • func (h *Header) Marshal() ([]byte, error)
  • func (h *Header) String() string
  • func (h *Header) Unmarshal(b []byte) error
• type HeaderFlags

Constants

const (
	Version   = 4  // protocol version
	HeaderLen = 20 // header length without extension headers

)

Types

type Header

type Header struct {
	Version  int         // protocol version
	Len      int         // header length
	TOS      int         // type-of-service
	TotalLen int         // packet total length
	ID       int         // identification
	Flags    HeaderFlags // flags
	FragOff  int         // fragment offset
	TTL      int         // time-to-live
	Protocol int         // next protocol
	Checksum int         // checksum
	Src      net.IP      // source address
	Dst      net.IP      // destination address
	Options  []byte      // options, extension headers

	Payload []byte
}

A Header represents an IPv4 header.

func Parse

func Parse(b []byte) (*Header, error)

ParseHeader parses b as an IPv4 header.

func (*Header) Marshal

func (h *Header) Marshal() ([]byte, error)

Marshal returns the binary encoding of the IPv4 header h.

func (*Header) String

func (h *Header) String() string

func (*Header) Unmarshal

func (h *Header) Unmarshal(b []byte) error

type HeaderFlags

type HeaderFlags int

const (
	MoreFragments HeaderFlags = 1 << iota // more fragments flag
	DontFragment                          // don't fragment flag
)