ip

package
v2.4.5-rc.1 Latest Latest
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 Go to latest Published: Oct 14, 2021 License: Apache-2.0 Imports: 11 Imported by: 0

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Constants

This section is empty.

Variables

This section is empty.

Functions

func InitPacket 

func InitPacket(pkg Packet, ipPayloadLen int, src, dst net.IP)

func L4Checksum 

func L4Checksum(ipHdr Header, checksumPosition, l4Proto int)

L4Checksum computes a checksum for a layer 4 TCP or UDP header using a pseudo header created from the given IP header and assigns that checksum to the two bytes starting at checksumPosition.

The checksumPosition is the offset into the IP payload for the checksum for the given level-4 protocol which should be ipproto.TCP or ipproto.UDP.

It is assumed that the ipHdr represents an un-fragmented packet with a complete L4 payload.

func NextID 

func NextID() int

Types 

type Header interface {
	// Initialize ensures that the header has the correct version and that all other bytes are zero
	Initialize()

	// Version returns ipv4.Version or ipv6.Version
	Version() int

	// Destination returns the destination IP
	Destination() net.IP

	// Source returns the source IP
	Source() net.IP

	// 	HeaderLength() is the length of this header
	HeaderLen() int

	// PayloadLen is the length of the payload
	PayloadLen() int

	// L4Protocol is the protocol of the layer-4 header.
	L4Protocol() int

	// Packet returns the full packet that this header is backed by.
	Packet() []byte

	// Payload returns the payload of the packet that this header is backed by.
	Payload() []byte

	// PseudoHeader returns the pseudo header used when computing the checksum for a layer-4 header.
	// All fields must be filled in before requesting this header.
	PseudoHeader(l4Proto int) []byte

	// SetTTL sets the hop limit
	SetTTL(id int)

	// SetSource sets the packet source IP address
	SetSource(ip net.IP)

	// SetDestination sets the packet destination IP address
	SetDestination(ip net.IP)

	// SetL4Protocol sets the layer 4 protocol (a.k.a. the next-layer protocol)
	SetL4Protocol(int)

	// SetPayloadLen sets the length of the payload
	SetPayloadLen(int)

	// SetChecksum computes the checksum for this header. No further modifications must be made once this is called.
	// This method is a no-op for ipv6.
	SetChecksum()
}

A Header provides a common interface for the V4Header and the V6Header

func ParseHeader 

func ParseHeader(b []byte) (Header, error)

ParseHeader returns a v4 or v6 header backed by the given argument. The type of header is determined by looking at the top 4 bits of the first byte which must match ipv4.Version or ipv6.Version

type Packet 

type Packet interface {
	IPHeader() Header
	Data() *buffer.Data
	Release()
	SetDataAndIPHeader(*buffer.Data, Header)
}

type V4Header 

type V4Header []byte

func (V4Header) Checksum 

func (h V4Header) Checksum() int

func (V4Header) ConcatFragments 

func (h V4Header) ConcatFragments(data *buffer.Data, fragsMap map[uint16][]*buffer.Data) *buffer.Data

func (V4Header) DSCP 

func (h V4Header) DSCP() int

func (V4Header) Destination 

func (h V4Header) Destination() net.IP

func (V4Header) ECN 

func (h V4Header) ECN() int

func (V4Header) Flags 

func (h V4Header) Flags() ipv4.HeaderFlags

func (V4Header) FragmentOffset 

func (h V4Header) FragmentOffset() int

func (V4Header) HeaderLen 

func (h V4Header) HeaderLen() int

func (V4Header) ID 

func (h V4Header) ID() uint16

func (V4Header) Initialize 

func (h V4Header) Initialize()

func (V4Header) L4Protocol 

func (h V4Header) L4Protocol() int

func (V4Header) Options 

func (h V4Header) Options() ([]V4Option, error)

func (V4Header) Packet 

func (h V4Header) Packet() []byte

func (V4Header) Payload 

func (h V4Header) Payload() []byte

func (V4Header) PayloadLen 

func (h V4Header) PayloadLen() int

func (V4Header) PseudoHeader 

func (h V4Header) PseudoHeader(l4Proto int) []byte

func (V4Header) SetChecksum 

func (h V4Header) SetChecksum()

func (V4Header) SetDestination 

func (h V4Header) SetDestination(ip net.IP)

func (V4Header) SetFlags 

func (h V4Header) SetFlags(flags ipv4.HeaderFlags)

func (V4Header) SetFragmentOffset 

func (h V4Header) SetFragmentOffset(fragOff int)

func (V4Header) SetHeaderLen 

func (h V4Header) SetHeaderLen(hl int)

func (V4Header) SetID 

func (h V4Header) SetID(id int)

func (V4Header) SetL4Protocol 

func (h V4Header) SetL4Protocol(proto int)

func (V4Header) SetPayloadLen 

func (h V4Header) SetPayloadLen(len int)

func (V4Header) SetSource 

func (h V4Header) SetSource(ip net.IP)

func (V4Header) SetTTL 

func (h V4Header) SetTTL(hops int)

func (V4Header) Source 

func (h V4Header) Source() net.IP

func (V4Header) TTL 

func (h V4Header) TTL() int

func (V4Header) Version 

func (h V4Header) Version() int

type V4Option 

type V4Option []byte

func (V4Option) Class 

func (o V4Option) Class() int

func (V4Option) Copied 

func (o V4Option) Copied() bool

func (V4Option) Data 

func (o V4Option) Data() []byte

func (V4Option) Len 

func (o V4Option) Len() int

func (V4Option) Number 

func (o V4Option) Number() int

type V6Header 

type V6Header []byte

func (V6Header) Destination 

func (h V6Header) Destination() net.IP

func (V6Header) FlowLabel 

func (h V6Header) FlowLabel() int

func (V6Header) HeaderLen 

func (h V6Header) HeaderLen() int

func (V6Header) HopLimit 

func (h V6Header) HopLimit() int

func (V6Header) Initialize 

func (h V6Header) Initialize()

func (V6Header) L4Protocol 

func (h V6Header) L4Protocol() int

func (V6Header) NextHeader 

func (h V6Header) NextHeader() int

func (V6Header) Packet 

func (h V6Header) Packet() []byte

func (V6Header) Payload 

func (h V6Header) Payload() []byte

func (V6Header) PayloadLen 

func (h V6Header) PayloadLen() int

func (V6Header) ProcessFragments 

func (h V6Header) ProcessFragments(data *buffer.Data, fragsMap map[uint16][]*buffer.Data) *buffer.Data

func (V6Header) PseudoHeader 

func (h V6Header) PseudoHeader(l4Proto int) []byte

func (V6Header) SetChecksum 

func (h V6Header) SetChecksum()

func (V6Header) SetDestination 

func (h V6Header) SetDestination(ip net.IP)

func (V6Header) SetL4Protocol 

func (h V6Header) SetL4Protocol(proto int)

func (V6Header) SetPayloadLen 

func (h V6Header) SetPayloadLen(tl int)

func (V6Header) SetSource 

func (h V6Header) SetSource(ip net.IP)

func (V6Header) SetTTL 

func (h V6Header) SetTTL(hops int)

func (V6Header) Source 

func (h V6Header) Source() net.IP

func (V6Header) TrafficClass 

func (h V6Header) TrafficClass() int

func (V6Header) Version 

func (h V6Header) Version() int

type Writer 

type Writer interface {
	Write(context.Context, Packet) error
}

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