slayers

package
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 Go to latest Published: Dec 4, 2020 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Overview

Package slayers contains gopacket style layers for the SCION Header, HopByHop and EndToEnd Extension headers, SCMP, and SCION/UDP.

Basic Decoding

There are multiple ways to decode a SCION packet. If performance is of no concern a new gopacket.Packet can be instantiated: 

// Eagerly decode an entire SCION packet
packet := gopacket.NewPacket(raw, LayerTypeSCION, gopacket.Default)
// Access the SCION header
if scnL := packet.Layer(LayerTypeSCION); scnL != nil {
	fmt.Println("This is a SCION packet.")
	// Access the actual SCION data from this layer
	s := scnL.(*slayers.SCION) // Guaranteed to work
	fmt.Printf("From %s to %s\n", s.SrcIA, s.DstIA)
}
// Similarly, a SCION/UDP payload can be accessed
if udpL := packet.Layer(LayerTypeSCIONUDP); udpL != nil {
	u := udpL.(*slayers.UDP) // Guaranteed to work
	fmt.Printf("From %d to %d\n", u.SrcPort, u.DstPort)
}

Decoding using gopacket.DecodingLayerParser

Decoding using gopacket.DecodingLayerParser can yield speed ups for more than 10x compared to eager decoding. The following can be used to decode any SCION packet (including HBH and E2E extension) that have either a SCION/UDP or SCMP payload: 

var scn slayers.SCION
var hbh slayers.HopByHopExtn
var e2e slayers.EndToEndExtn
var udp slayers.UDP
var scmp slayers.SCMP
var pld gopacket.Payload
parser := gopacket.NewDecodingLayerParser(LayerTypeSCION, &scn, &hbh, &e2e, &udp, &scmp, &pld)
decoded := []gopacket.LayerType{}
if err := parser.DecodeLayers(packetData, &decoded); err != nil {
	// Handle error
}
for _, layerType := range decoded {
	// Handle layers
}

The important thing to note here is that the parser is modifying the passed in layers (scn, hbh, e2e, udp, scmp) instead of allocating new ones, thus greatly speeding up the decoding process. It's even branching based on layer type... it'll handle an (scn, e2e, udp) or (scn, hbh, scmp) stack.

Note: Great care has been taken to only lazily parse the SCION header, however, HBH and E2E extensions are currently eagerly parsed (if they exist). Thus, handling packets containing these extensions will be much slower (see the package benchmarks for reference).

Creating Packet Data

Packet data can be created by instantiating the various slayers.* types. To generate an empty (and useless) SCION(HBH(UDP(Payload))) packet, for example, you can run: 

s := &slayers.SCION{}
hbh := &slayers.HopByHopExtn{}
udp := &slayers.UDP{}
pld := gopacket.Payload([]byte{1, 2, 3, 4}))
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{}
if err := gopacket.SerializeLayers(buf, opts, s, hbh, udp, pld); err != nil {
	// Handle error
}
packedData := buf.Bytes()

Index

Constants

View Source 
const (
	// LineLen is the length of a SCION header line in bytes.
	LineLen = 4
	// CmnHdrLen is the length of the SCION common header in bytes.
	CmnHdrLen = 12
	// SCIONVersion is the currently supported version of the SCION header format. Different
	// versions are not guaranteed to be compatible to each other.
	SCIONVersion = 0
)
View Source 
const MaxSCMPPacketLen = 1232

MaxSCMPPacketLen the maximum length a SCION packet including SCMP quote can have. This length includes the SCION, and SCMP header of the packet. 

+-------------------------+
|        Underlay         |
+-------------------------+
|          SCION          |  \
|          SCMP           |   \
+-------------------------+    \_ MaxSCMPPacketLen
|          Quote:         |    /
|        SCION Orig       |   /
|         L4 Orig         |  /
+-------------------------+

Variables

View Source 
var (
	LayerTypeSCION = gopacket.RegisterLayerType(
		1000,
		gopacket.LayerTypeMetadata{
			Name:    "SCION",
			Decoder: gopacket.DecodeFunc(decodeSCION),
		},
	)
	LayerTypeSCIONUDP = gopacket.RegisterLayerType(
		1001,
		gopacket.LayerTypeMetadata{
			Name:    "SCION/UDP",
			Decoder: gopacket.DecodeFunc(decodeSCIONUDP),
		},
	)
	LayerTypeSCMP = gopacket.RegisterLayerType(
		1002,
		gopacket.LayerTypeMetadata{
			Name:    "SCMP",
			Decoder: gopacket.DecodeFunc(decodeSCMP),
		},
	)
	LayerTypeSCMPDummy = gopacket.RegisterLayerType(
		2002,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPDummy",
			Decoder: gopacket.DecodeFunc(decodeSCMP),
		},
	)

	LayerTypeHopByHopExtn              gopacket.LayerType
	LayerTypeEndToEndExtn              gopacket.LayerType
	LayerTypeSCMPExternalInterfaceDown = gopacket.RegisterLayerType(
		1005,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPExternalInterfaceDown",
			Decoder: gopacket.DecodeFunc(decodeSCMPExternalInterfaceDown),
		},
	)
	LayerTypeSCMPInternalConnectivityDown = gopacket.RegisterLayerType(
		1006,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPInternalConnectivityDown",
			Decoder: gopacket.DecodeFunc(decodeSCMPInternalConnectivityDown),
		},
	)
	LayerTypeSCMPParameterProblem = gopacket.RegisterLayerType(
		1007,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPParameterProblem",
			Decoder: gopacket.DecodeFunc(decodeSCMPParameterProblem),
		},
	)
	LayerTypeSCMPDestinationUnreachable = gopacket.RegisterLayerType(
		1008,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPDestinationUnreachable",
			Decoder: gopacket.DecodeFunc(decodeSCMPDestinationUnreachable),
		},
	)
	LayerTypeSCMPEcho = gopacket.RegisterLayerType(
		1128,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPEcho",
			Decoder: gopacket.DecodeFunc(decodeSCMPEcho),
		},
	)
	LayerTypeSCMPTraceroute = gopacket.RegisterLayerType(
		1130,
		gopacket.LayerTypeMetadata{
			Name:    "SCMPTraceroute",
			Decoder: gopacket.DecodeFunc(decodeSCMPTraceroute),
		},
	)
)

Functions

This section is empty.

Types

type AddrLen 

type AddrLen uint8

AddrLen indicates the length of a host address in the SCION header. The four possible lengths are 4, 8, 12, or 16 bytes. 

const (
	AddrLen4 AddrLen = iota
	AddrLen8
	AddrLen12
	AddrLen16
)

AddrLen constants

type AddrType 

type AddrType uint8

AddrType indicates the type of a host address of a given length in the SCION header. There are four possible types per address length. 

const (
	T4Ip AddrType = iota
	T4Svc
)

AddrType constants 

const (
	T16Ip AddrType = iota
)

AddrLen16 types

type EndToEndExtn 

type EndToEndExtn struct {
	Options []*EndToEndOption
	// contains filtered or unexported fields
}

EndToEndExtn is the SCION end-to-end options extension.

func (*EndToEndExtn) CanDecode 

func (e *EndToEndExtn) CanDecode() gopacket.LayerClass

func (*EndToEndExtn) DecodeFromBytes 

func (e *EndToEndExtn) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes implementation according to gopacket.DecodingLayer

func (*EndToEndExtn) LayerPayload 

func (e *EndToEndExtn) LayerPayload() []byte

func (*EndToEndExtn) LayerType 

func (e *EndToEndExtn) LayerType() gopacket.LayerType

func (*EndToEndExtn) NextLayerType 

func (e *EndToEndExtn) NextLayerType() gopacket.LayerType

func (*EndToEndExtn) SerializeTo 

func (e *EndToEndExtn) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo implementation according to gopacket.SerializableLayer

type EndToEndOption 

type EndToEndOption tlvOption

EndToEndOption is a TLV option present in a SCION end-to-end extension.

type HopByHopExtn 

type HopByHopExtn struct {
	Options []*HopByHopOption
	// contains filtered or unexported fields
}

HopByHopExtn is the SCION hop-by-hop options extension.

func (*HopByHopExtn) CanDecode 

func (h *HopByHopExtn) CanDecode() gopacket.LayerClass

func (*HopByHopExtn) DecodeFromBytes 

func (h *HopByHopExtn) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes implementation according to gopacket.DecodingLayer

func (*HopByHopExtn) LayerPayload 

func (h *HopByHopExtn) LayerPayload() []byte

func (*HopByHopExtn) LayerType 

func (h *HopByHopExtn) LayerType() gopacket.LayerType

func (*HopByHopExtn) NextLayerType 

func (h *HopByHopExtn) NextLayerType() gopacket.LayerType

func (*HopByHopExtn) SerializeTo 

func (h *HopByHopExtn) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo implementation according to gopacket.SerializableLayer

type HopByHopOption 

type HopByHopOption tlvOption

HopByHopOption is a TLV option present in a SCION hop-by-hop extension.

type OptionType 

type OptionType uint8

OptionType indicates the type of a TLV Option that is part of an extension header. 

const (
	OptTypePad1 OptionType = iota
	OptTypePadN
)

Definition of option type constants.

type SCION 

type SCION struct {
	layers.BaseLayer

	// Version is version of the SCION Header. Currently, only 0 is supported.
	Version uint8
	// TrafficClass denotes the traffic class. Its value in a received packet or fragment might be
	// different from the value sent by the packet’s source. The current use of the Traffic Class
	// field for Differentiated Services and Explicit Congestion Notification is specified in
	// RFC2474 and RFC3168
	TrafficClass uint8
	// FlowID is a 20-bit field used by a source to label sequences of packets to be treated in the
	// network as a single flow. It is mandatory to be set.
	FlowID uint32
	// NextHdr  encodes the type of the first header after the SCION header. This can be either a
	// SCION extension or a layer-4 protocol such as TCP or UDP. Values of this field respect and
	// extend IANA’s assigned internet protocol numbers.
	NextHdr common.L4ProtocolType
	// HdrLen is the length of the SCION header in multiples of 4 bytes. The SCION header length is
	// computed as HdrLen * 4 bytes. The 8 bits of the HdrLen field limit the SCION header to a
	// maximum of 1024 bytes.
	HdrLen uint8
	// PayloadLen is the length of the payload in bytes. The payload includes extension headers and
	// the L4 payload. This field is 16 bits long, supporting a maximum payload size of 64KB.
	PayloadLen uint16
	// PathType specifies the type of path in this SCION header.
	PathType path.Type
	// DstAddrType (2 bit) is the type of the destination address.
	DstAddrType AddrType
	// DstAddrLen (2 bit) is the length of the destination address. Supported address length are 4B
	// (0), 8B (1), 12B (2), and 16B (3).
	DstAddrLen AddrLen
	// SrcAddrType (2 bit) is the type of the source address.
	SrcAddrType AddrType
	// SrcAddrLen (2 bit) is the length of the source address. Supported address length are 4B (0),
	// 8B (1), 12B (2), and 16B (3).
	SrcAddrLen AddrLen

	// DstIA is the destination ISD-AS.
	DstIA addr.IA
	// SrcIA is the source ISD-AS.
	SrcIA addr.IA
	// RawDstAddr is the destination address.
	RawDstAddr []byte
	// RawSrcAddr is the source address.
	RawSrcAddr []byte

	// Path is the path contained in the SCION header. It depends on the PathType field.
	Path path.Path
}

SCION is the header of a SCION packet.

func (*SCION) AddrHdrLen 

func (s *SCION) AddrHdrLen() int

AddrHdrLen returns the length of the address header (destination and source ISD-AS-Host triples) in bytes.

func (*SCION) CanDecode 

func (s *SCION) CanDecode() gopacket.LayerClass

func (*SCION) DecodeAddrHdr 

func (s *SCION) DecodeAddrHdr(data []byte) error

DecodeAddrHdr decodes the destination and source ISD-AS-Host address triples from the provided buffer. The caller must ensure that the correct address types and lengths are set in the SCION layer, otherwise the results of this method are undefined.

func (*SCION) DecodeFromBytes 

func (s *SCION) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the SCION layer. DecodeFromBytes resets the internal state of this layer to the state defined by the passed-in bytes. Slices in the SCION layer reference the passed-in data, so care should be taken to copy it first should later modification of data be required before the SCION layer is discarded.

func (*SCION) DstAddr 

func (s *SCION) DstAddr() (net.Addr, error)

DstAddr parses the destination address into a net.Addr. The returned net.Addr references data from the underlaying layer data. Changing the net.Addr object might lead to inconsistent layer information and thus should be treated read-only. Instead, SetDstAddr should be used to update the destination address.

func (*SCION) LayerPayload 

func (s *SCION) LayerPayload() []byte

func (*SCION) LayerType 

func (s *SCION) LayerType() gopacket.LayerType

func (*SCION) NetworkFlow 

func (s *SCION) NetworkFlow() gopacket.Flow

func (*SCION) NextLayerType 

func (s *SCION) NextLayerType() gopacket.LayerType

func (*SCION) SerializeAddrHdr 

func (s *SCION) SerializeAddrHdr(buf []byte) error

SerializeAddrHdr serializes destination and source ISD-AS-Host address triples into the provided buffer. The caller must ensure that the correct address types and lengths are set in the SCION layer, otherwise the results of this method are undefined.

func (*SCION) SerializeTo 

func (s *SCION) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error

func (*SCION) SetDstAddr 

func (s *SCION) SetDstAddr(dst net.Addr) error

SetDstAddr sets the destination address and updates the DstAddrLen/Type fields accordingly. SetDstAddr takes ownership of dst and callers should not write to it after calling SetDstAddr. Changes to dst might leave the layer in an inconsistent state.

func (*SCION) SetSrcAddr 

func (s *SCION) SetSrcAddr(src net.Addr) error

SetSrcAddr sets the source address and updates the DstAddrLen/Type fields accordingly. SetSrcAddr takes ownership of src and callers should not write to it after calling SetSrcAddr. Changes to src might leave the layer in an inconsistent state.

func (*SCION) SrcAddr 

func (s *SCION) SrcAddr() (net.Addr, error)

SrcAddr parses the source address into a net.Addr. The returned net.Addr references data from the underlaying layer data. Changing the net.Addr object might lead to inconsistent layer information and thus should be treated read-only. Instead, SetDstAddr should be used to update the source address.

type SCMP 

type SCMP struct {
	layers.BaseLayer
	TypeCode SCMPTypeCode
	Checksum uint16
	// contains filtered or unexported fields
}

SCMP is the SCMP header on top of SCION header. 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Type      |     Code      |           Checksum            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                            InfoBlock                          |
+                                                               +
|                         (variable length)                     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                            DataBlock                          |
+                                                               +
|                         (variable length)                     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMP) CanDecode 

func (s *SCMP) CanDecode() gopacket.LayerClass

CanDecode returns the set of layer types that this DecodingLayer can decode.

func (*SCMP) DecodeFromBytes 

func (s *SCMP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMP) LayerType 

func (s *SCMP) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMP.

func (*SCMP) NextLayerType 

func (s *SCMP) NextLayerType() gopacket.LayerType

NextLayerType use the typecode to select the right next decoder. If the SCMP type is unknown, the next layer is gopacket.LayerTypePayload.

func (*SCMP) SerializeTo 

func (s *SCMP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

func (*SCMP) SetNetworkLayerForChecksum 

func (s *SCMP) SetNetworkLayerForChecksum(l gopacket.NetworkLayer) error

SetNetworkLayerForChecksum tells this layer which network layer is wrapping it. This is needed for computing the checksum when serializing,

func (*SCMP) String 

func (s *SCMP) String() string

type SCMPCode 

type SCMPCode uint8

SCMPCode is the code of the SCMP type code. 

const (
	SCMPCodeNoRoute                   SCMPCode = 0
	SCMPCodeAdminDeny                 SCMPCode = 1
	SCMPCodeBeyondScopeOfSourceAddr   SCMPCode = 2
	SCMPCodeAddressUnreachable        SCMPCode = 3
	SCMPCodePortUnreachable           SCMPCode = 4
	SCMPCodeSourceAddressFailedPolicy SCMPCode = 5
	SCMPCodeRejectRouteToDest         SCMPCode = 6
)

Destination unreachable codes 

const (
	SCMPCodeErroneousHeaderField SCMPCode = 0
	SCMPCodeUnknownNextHdrType   SCMPCode = 1

	SCMPCodeInvalidCommonHeader  SCMPCode = 16
	SCMPCodeUnknownSCIONVersion  SCMPCode = 17
	SCMPCodeFlowIDRequired       SCMPCode = 18
	SCMPCodeInvalidPacketSize    SCMPCode = 19
	SCMPCodeUnknownPathType      SCMPCode = 20
	SCMPCodeUnknownAddressFormat SCMPCode = 21

	SCMPCodeInvalidAddressHeader      SCMPCode = 32
	SCMPCodeInvalidSourceAddress      SCMPCode = 33
	SCMPCodeInvalidDestinationAddress SCMPCode = 34
	SCMPCodeNonLocalDelivery          SCMPCode = 35

	SCMPCodeInvalidPath            SCMPCode = 48
	SCMPCodeUnknownHopFieldIngress SCMPCode = 49
	SCMPCodeUnknownHopFieldEgress  SCMPCode = 50
	SCMPCodeInvalidHopFieldMAC     SCMPCode = 51
	SCMPCodePathExpired            SCMPCode = 52
	SCMPCodeInvalidSegmentChange   SCMPCode = 53

	SCMPCodeInvalidExtensionHeader SCMPCode = 64
	SCMPCodeUnknownHopByHopOption  SCMPCode = 65
	SCMPCodeUnknownEndToEndOption  SCMPCode = 66
)

ParameterProblem

type SCMPDestinationUnreachable 

type SCMPDestinationUnreachable struct {
	layers.BaseLayer
}

SCMPDestinationUnreachable represents the structure of a destination unreachable message. 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                             Unused                            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMPDestinationUnreachable) DecodeFromBytes 

func (i *SCMPDestinationUnreachable) DecodeFromBytes(data []byte,
	df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMPDestinationUnreachable) LayerType 

func (*SCMPDestinationUnreachable) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMPTraceroute.

func (*SCMPDestinationUnreachable) NextLayerType 

func (*SCMPDestinationUnreachable) NextLayerType() gopacket.LayerType

NextLayerType returns the layer type contained by this DecodingLayer.

func (*SCMPDestinationUnreachable) SerializeTo 

func (i *SCMPDestinationUnreachable) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

type SCMPEcho 

type SCMPEcho struct {
	layers.BaseLayer
	Identifier uint16
	SeqNumber  uint16
}

SCMPEcho represents the structure of a ping. 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           Identifier          |        Sequence Number        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMPEcho) DecodeFromBytes 

func (i *SCMPEcho) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMPEcho) LayerType 

func (*SCMPEcho) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMPEcho.

func (*SCMPEcho) NextLayerType 

func (*SCMPEcho) NextLayerType() gopacket.LayerType

NextLayerType returns the layer type contained by this DecodingLayer.

func (*SCMPEcho) SerializeTo 

func (i *SCMPEcho) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

type SCMPExternalInterfaceDown 

type SCMPExternalInterfaceDown struct {
	layers.BaseLayer
	IA   addr.IA
	IfID uint64
}

SCMPExternalInterfaceDown message contains the data for that error. 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|              ISD              |                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+         AS                    +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                        Interface ID                           +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMPExternalInterfaceDown) DecodeFromBytes 

func (i *SCMPExternalInterfaceDown) DecodeFromBytes(data []byte,
	df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMPExternalInterfaceDown) LayerType 

func (i *SCMPExternalInterfaceDown) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMPExternalInterfaceDown.

func (*SCMPExternalInterfaceDown) NextLayerType 

func (i *SCMPExternalInterfaceDown) NextLayerType() gopacket.LayerType

NextLayerType returns the layer type contained by this DecodingLayer.

func (*SCMPExternalInterfaceDown) SerializeTo 

func (i *SCMPExternalInterfaceDown) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

type SCMPInternalConnectivityDown 

type SCMPInternalConnectivityDown struct {
	layers.BaseLayer
	IA      addr.IA
	Ingress uint64
	Egress  uint64
}

SCMPInternalConnectivityDown indicates the AS internal connection between 2 routers is down. The format is as follows: 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|              ISD              |                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+         AS                    +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                   Ingress Interface ID                        +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                   Egress Interface ID                         +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMPInternalConnectivityDown) DecodeFromBytes 

func (i *SCMPInternalConnectivityDown) DecodeFromBytes(data []byte,
	df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMPInternalConnectivityDown) LayerType 

func (*SCMPInternalConnectivityDown) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMPInternalConnectivityDown.

func (*SCMPInternalConnectivityDown) NextLayerType 

func (*SCMPInternalConnectivityDown) NextLayerType() gopacket.LayerType

NextLayerType returns the layer type contained by this DecodingLayer.

func (*SCMPInternalConnectivityDown) SerializeTo 

func (i *SCMPInternalConnectivityDown) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

type SCMPParameterProblem 

type SCMPParameterProblem struct {
	layers.BaseLayer
	Pointer uint16
}

SCMPParameterProblem represents the structure of a parameter problem message. 

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|            reserved           |           Pointer             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMPParameterProblem) DecodeFromBytes 

func (i *SCMPParameterProblem) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMPParameterProblem) LayerType 

func (*SCMPParameterProblem) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMPParameterProblem.

func (*SCMPParameterProblem) NextLayerType 

func (*SCMPParameterProblem) NextLayerType() gopacket.LayerType

NextLayerType returns the layer type contained by this DecodingLayer.

func (*SCMPParameterProblem) SerializeTo 

func (i *SCMPParameterProblem) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

type SCMPTraceroute 

type SCMPTraceroute struct {
	layers.BaseLayer
	Identifier uint16
	Sequence   uint16
	IA         addr.IA
	Interface  uint64
}

SCMPTraceroute represents the structure of a traceroute. 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           Identifier          |        Sequence Number        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|              ISD              |                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+         AS                    +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                        Interface ID                           +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

func (*SCMPTraceroute) DecodeFromBytes 

func (i *SCMPTraceroute) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error

DecodeFromBytes decodes the given bytes into this layer.

func (*SCMPTraceroute) LayerType 

func (*SCMPTraceroute) LayerType() gopacket.LayerType

LayerType returns LayerTypeSCMPTraceroute.

func (*SCMPTraceroute) NextLayerType 

func (*SCMPTraceroute) NextLayerType() gopacket.LayerType

NextLayerType returns the layer type contained by this DecodingLayer.

func (*SCMPTraceroute) SerializeTo 

func (i *SCMPTraceroute) SerializeTo(b gopacket.SerializeBuffer,
	opts gopacket.SerializeOptions) error

SerializeTo writes the serialized form of this layer into the SerializationBuffer, implementing gopacket.SerializableLayer.

type SCMPType 

type SCMPType uint8

SCMPType is the type of the SCMP type code. 

const (
	SCMPTypeDestinationUnreachable   SCMPType = 1
	SCMPTypePacketTooBig             SCMPType = 2
	SCMPTypeParameterProblem         SCMPType = 4
	SCMPTypeExternalInterfaceDown    SCMPType = 5
	SCMPTypeInternalConnectivityDown SCMPType = 6
)

SCMP error messages. 

const (
	SCMPTypeEchoRequest       SCMPType = 128
	SCMPTypeEchoReply         SCMPType = 129
	SCMPTypeTracerouteRequest SCMPType = 130
	SCMPTypeTracerouteReply   SCMPType = 131
)

SCMP informational messages.

type SCMPTypeCode 

type SCMPTypeCode uint16

SCMPTypeCode represents SCMP type/code case.

func CreateSCMPTypeCode 

func CreateSCMPTypeCode(typ SCMPType, code SCMPCode) SCMPTypeCode

CreateSCMPTypeCode is a convenience function to create an SCMPTypeCode

func (SCMPTypeCode) Code 

func (a SCMPTypeCode) Code() SCMPCode

Code returns the SCMP code field.

func (SCMPTypeCode) InfoMsg 

func (a SCMPTypeCode) InfoMsg() bool

InfoMsg indicates if the SCMP message is an SCMP informational message.

func (SCMPTypeCode) SerializeTo 

func (a SCMPTypeCode) SerializeTo(bytes []byte)

SerializeTo writes the SCMPTypeCode value to the buffer.

func (SCMPTypeCode) String 

func (a SCMPTypeCode) String() string

func (SCMPTypeCode) Type 

func (a SCMPTypeCode) Type() SCMPType

Type returns the SCMP type field.

type UDP 

type UDP struct {
	layers.UDP
	// contains filtered or unexported fields
}

UDP is the SCION/UDP header. It reuses layers.UDP as much as possible and only customizes checksum calculation.

func (*UDP) CanDecode 

func (u *UDP) CanDecode() gopacket.LayerClass

func (*UDP) LayerType 

func (u *UDP) LayerType() gopacket.LayerType

func (*UDP) SerializeTo 

func (u *UDP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error

func (*UDP) SetNetworkLayerForChecksum 

func (u *UDP) SetNetworkLayerForChecksum(l gopacket.NetworkLayer) error

func (*UDP) String 

func (u *UDP) String() string

Source Files

View all Source files

Directories

Path Synopsis
internal
fuzz
empty
onehop
scion

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