packet

package
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 Go to latest Published: May 10, 2024 License: MIT Imports: 11 Imported by: 0

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Index

Constants

View Source 
const (
	// LSRefreshTime The maximum time between distinct originations of any particular
	//        LSA.  If the LS age field of one of the router's self-originated
	//        LSAs reaches the value LSRefreshTime, a new instance of the LSA
	//        is originated, even though the contents of the LSA (apart from
	//        the LSA header) will be the same.  The value of LSRefreshTime is
	//        set to 30 minutes.
	LSRefreshTime = 30 * 60

	// MinLSInterval The minimum time between distinct originations of any particular
	//        LSA.  The value of MinLSInterval is set to 5 seconds.
	MinLSInterval = 5

	// MinLSArrival For any particular LSA, the minimum time that must elapse
	//        between reception of new LSA instances during flooding. LSA
	//        instances received at higher frequencies are discarded. The
	//        value of MinLSArrival is set to 1 second.
	MinLSArrival = 1

	// MaxAge The maximum age that an LSA can attain. When an LSA's LS age
	//        field reaches MaxAge, it is reflooded in an attempt to flush the
	//        LSA from the routing domain (See Section 14). LSAs of age MaxAge
	//        are not used in the routing table calculation.  The value of
	//        MaxAge is set to 1 hour.
	MaxAge = 60 * 60

	// CheckAge When the age of an LSA in the link state database hits a
	//        multiple of CheckAge, the LSA's checksum is verified.  An
	//        incorrect checksum at this time indicates a serious error.  The
	//        value of CheckAge is set to 5 minutes.
	CheckAge = 5 * 60

	// MaxAgeDiff The maximum time dispersion that can occur, as an LSA is flooded
	//        throughout the AS.  Most of this time is accounted for by the
	//        LSAs sitting on router output queues (and therefore not aging)
	//        during the flooding process.  The value of MaxAgeDiff is set to
	//        15 minutes.
	MaxAgeDiff = 15 * 60

	// LSInfinity The metric value indicating that the destination described by an
	//        LSA is unreachable. Used in summary-LSAs and AS-external-LSAs as
	//        an alternative to premature aging (see Section 14.1). It is
	//        defined to be the 24-bit binary value of all ones: 0xffffff.
	LSInfinity = 0xffffff

	// DefaultDestination The Destination ID that indicates the default route.  This route
	//        is used when no other matching routing table entry can be found.
	//        The default destination can only be advertised in AS-external-
	//        LSAs and in stub areas' type 3 summary-LSAs.  Its value is the
	//        IP address 0.0.0.0. Its associated Network Mask is also always
	//        0.0.0.0.
	DefaultDestination = 0

	// InitialSequenceNumber The value used for LS Sequence Number when originating the first
	//        instance of any LSA. Its value is the signed 32-bit integer
	//        0x80000001.
	InitialSequenceNumber = 0x80000001

	// MaxSequenceNumber The maximum value that LS Sequence Number can attain.  Its value
	//        is the signed 32-bit integer 0x7fffffff.
	MaxSequenceNumber = 0x7fffffff
)
View Source 
const (

	// CapabilityEbit This bit describes the way AS-external-LSAs are flooded, as
	//        described in Sections 3.6, 9.5, 10.8 and 12.1.2 of this memo.
	CapabilityEbit = 1
	// CapabilityMCbit This bit describes whether IP multicast datagrams are forwarded
	//        according to the specifications in [Ref18].
	CapabilityMCbit = 2
	// CapabilityNPbit This bit describes the handling of Type-7 LSAs, as specified in
	//        [Ref19].
	CapabilityNPbit = 3
	// CapabilityEAbit This bit describes the router's willingness to receive and
	//        forward External-Attributes-LSAs, as specified in [Ref20].
	CapabilityEAbit = 4
	// CapabilityDCbit This bit describes the router's handling of demand circuits, as
	//        specified in [Ref21].
	CapabilityDCbit = 5
)
View Source 
const (

	// DDFlagMSbit The Master/Slave bit.  When set to 1, it indicates that the
	//        router is the master during the Database Exchange process.
	//        Otherwise, the router is the slave.
	DDFlagMSbit = 0
	// DDFlagMbit The More bit.  When set to 1, it indicates that more Database
	//        Description Packets are to follow.
	DDFlagMbit = 1
	// DDFlagIbit The Init bit.  When set to 1, this packet is the first in the
	//        sequence of Database Description Packets.
	DDFlagIbit = 2
)
View Source 
const (

	// RouterLSAFlagBbit When set, the router is an area border router (B is for border).
	RouterLSAFlagBbit = 0
	// RouterLSAFlagEbit When set, the router is an AS boundary router (E is for external).
	RouterLSAFlagEbit = 1
	// RouterLSAFlagVbit When set, the router is an endpoint of one or more fully
	//        adjacent virtual links having the described area as Transit area
	//        (V is for virtual link endpoint).
	RouterLSAFlagVbit = 2
)
View Source 
const (

	// ASExternalLSAFlagEbit The type of external metric.  If bit E is set, the metric
	// specified is a Type 2 external metric.  This means the metric is
	// considered larger than any link state path.  If bit E is zero,
	// the specified metric is a Type 1 external metric.  This means
	// that it is expressed in the same units as the link state metric
	// i.e., the same units as interface cost).
	ASExternalLSAFlagEbit = 7
)

Variables

View Source 
var (
	ErrBufferLengthTooShort = errors.New("err buffer length too short")
)
View Source 
var (
	ErrNotImplemented = errors.New("not implemented")
)
View Source 
var InvalidLSAIdentity = LSAIdentity{}
View Source 
var (
	RandSource = rand.New(rand.NewPCG(uint64(time.Now().Unix()), uint64(time.Now().Unix()/2)))
)

Functions

This section is empty.

Types

type BitOption 

type BitOption uint8

func (BitOption) ClearBit 

func (b BitOption) ClearBit(bits ...uint8) BitOption

func (BitOption) IsBitSet 

func (b BitOption) IsBitSet(bit uint8) bool

func (BitOption) SetBit 

func (b BitOption) SetBit(bits ...uint8) BitOption

type DbDescPayload 

type DbDescPayload struct {
	layers.DbDescPkg
	LSAinfo []LSAheader
}

func (DbDescPayload) SerializeToSizedBuffer 

func (p DbDescPayload) SerializeToSizedBuffer(b []byte) (err error)

func (DbDescPayload) Size 

func (p DbDescPayload) Size() int

func (DbDescPayload) String 

func (p DbDescPayload) String() string

type HelloPayloadV2 

type HelloPayloadV2 layers.HelloPkgV2

func (HelloPayloadV2) SerializeToSizedBuffer 

func (p HelloPayloadV2) SerializeToSizedBuffer(b []byte) error

func (HelloPayloadV2) Size 

func (p HelloPayloadV2) Size() int

func (HelloPayloadV2) String 

func (p HelloPayloadV2) String() string

type HelloPayloadV3 

type HelloPayloadV3 layers.HelloPkg

type LSAContent 

type LSAContent interface {
	String() string
	// contains filtered or unexported methods
}

type LSAIdentity 

type LSAIdentity struct {
	LSType      uint16
	LinkStateId uint32
	AdvRouter   uint32
}

LSAIdentity The LS type, Link State ID, and Advertising Router fields can uniquely identify an LSA. If two LSAs have the same LS type, Link State ID, and Advertising Router fields, the two LSAs are considered to be the same, with one being old and the other being new.

type LSAcknowledgementPayload 

type LSAcknowledgementPayload []LSAheader

func (LSAcknowledgementPayload) SerializeToSizedBuffer 

func (p LSAcknowledgementPayload) SerializeToSizedBuffer(b []byte) (err error)

func (LSAcknowledgementPayload) Size 

func (p LSAcknowledgementPayload) Size() int

func (LSAcknowledgementPayload) String 

func (p LSAcknowledgementPayload) String() string

type LSAdv 

type LSAdv[T LSAdvPayload] struct {
	LSAdvertisement
	Content T
}

type LSAdvPayload 

type LSAdvPayload interface {
	V2RouterLSA | V2NetworkLSA |
		V2SummaryLSAType3 | V2SummaryLSAType4 |
		V2ASExternalLSA
	// contains filtered or unexported methods
}

type LSAdvertisement 

type LSAdvertisement struct {
	layers.LSA
	LSAheader
	Content LSAContent
}

func (LSAdvertisement) AsV2ASExternalLSA 

func (p LSAdvertisement) AsV2ASExternalLSA() (ret LSAdv[V2ASExternalLSA], err error)

func (LSAdvertisement) AsV2NetworkLSA 

func (p LSAdvertisement) AsV2NetworkLSA() (ret LSAdv[V2NetworkLSA], err error)

func (LSAdvertisement) AsV2RouterLSA 

func (p LSAdvertisement) AsV2RouterLSA() (ret LSAdv[V2RouterLSA], err error)

func (LSAdvertisement) AsV2SummaryLSAType3 

func (p LSAdvertisement) AsV2SummaryLSAType3() (ret LSAdv[V2SummaryLSAType3], err error)

func (LSAdvertisement) AsV2SummaryLSAType4 

func (p LSAdvertisement) AsV2SummaryLSAType4() (ret LSAdv[V2SummaryLSAType4], err error)

func (*LSAdvertisement) FixLengthAndChkSum 

func (p *LSAdvertisement) FixLengthAndChkSum() error

func (*LSAdvertisement) SerializeToSizedBuffer 

func (p *LSAdvertisement) SerializeToSizedBuffer(b []byte) (err error)

func (LSAdvertisement) Size 

func (p LSAdvertisement) Size() int

func (LSAdvertisement) String 

func (p LSAdvertisement) String() string

func (LSAdvertisement) ValidateLSA 

func (p LSAdvertisement) ValidateLSA() error

type LSAheader 

type LSAheader layers.LSAheader

func (*LSAheader) Ager 

func (p *LSAheader) Ager(t uint16) uint16

func (LSAheader) GetLSAIdentity 

func (p LSAheader) GetLSAIdentity() LSAIdentity

func (LSAheader) GetLSAck 

func (p LSAheader) GetLSAck() LSAheader

func (LSAheader) GetLSReq 

func (p LSAheader) GetLSReq() LSReq

func (LSAheader) IsMoreRecentThan 

func (p LSAheader) IsMoreRecentThan(toCompare LSAheader) bool

func (LSAheader) IsSame 

func (p LSAheader) IsSame(toCompare LSAheader) bool

func (*LSAheader) PrepareReOriginating 

func (p *LSAheader) PrepareReOriginating(incrSeq bool) (seqIncred bool)

func (LSAheader) SerializeToSizedBuffer 

func (p LSAheader) SerializeToSizedBuffer(b []byte) error

func (LSAheader) Size 

func (p LSAheader) Size() int

type LSReq 

type LSReq layers.LSReq

LSReq stands for a single link state request entry.

func (LSReq) GetLSAIdentity 

func (p LSReq) GetLSAIdentity() LSAIdentity

func (LSReq) SerializeToSizedBuffer 

func (p LSReq) SerializeToSizedBuffer(b []byte) (err error)

func (LSReq) Size 

func (p LSReq) Size() int

type LSRequestPayload 

type LSRequestPayload []LSReq

func (LSRequestPayload) SerializeToSizedBuffer 

func (p LSRequestPayload) SerializeToSizedBuffer(b []byte) (err error)

func (LSRequestPayload) Size 

func (p LSRequestPayload) Size() int

func (LSRequestPayload) String 

func (p LSRequestPayload) String() string

type LSUpdatePayload 

type LSUpdatePayload struct {
	layers.LSUpdate
	LSAs []LSAdvertisement
}

func (LSUpdatePayload) SerializeToSizedBuffer 

func (p LSUpdatePayload) SerializeToSizedBuffer(b []byte) (err error)

func (LSUpdatePayload) Size 

func (p LSUpdatePayload) Size() int

func (LSUpdatePayload) String 

func (p LSUpdatePayload) String() string

type LayerOSPFv2 

type LayerOSPFv2 layers.OSPFv2

func (*LayerOSPFv2) AsDbDescription 

func (l *LayerOSPFv2) AsDbDescription() (*OSPFv2Packet[DbDescPayload], error)

func (*LayerOSPFv2) AsHello 

func (l *LayerOSPFv2) AsHello() (*OSPFv2Packet[HelloPayloadV2], error)

func (*LayerOSPFv2) AsLSAcknowledgment 

func (l *LayerOSPFv2) AsLSAcknowledgment() (*OSPFv2Packet[LSAcknowledgementPayload], error)

func (*LayerOSPFv2) AsLSRequest 

func (l *LayerOSPFv2) AsLSRequest() (*OSPFv2Packet[LSRequestPayload], error)

func (*LayerOSPFv2) AsLSUpdate 

func (l *LayerOSPFv2) AsLSUpdate() (ret *OSPFv2Packet[LSUpdatePayload], err error)

type LegacyTOSInfo 

type LegacyTOSInfo struct {
	// IP Type of Service that this metric refers to.  The encoding of
	// TOS in OSPF LSAs is described in RFC 2328 Section 12.3.
	TOS uint8
	// TOS-specific metric information.
	// Only the lower 3 bytes are used.
	TOSMetric uint32
}

LegacyTOSInfo for backward compatibility with previous versions of the OSPF specification. aka RFC 1583

type OSPFPayloadV2 

type OSPFPayloadV2 interface {
	HelloPayloadV2 | DbDescPayload |
		LSRequestPayload | LSUpdatePayload | LSAcknowledgementPayload

	String() string
	// contains filtered or unexported methods
}

type OSPFv2Packet 

type OSPFv2Packet[T OSPFPayloadV2] struct {
	layers.OSPFv2
	Content T //replace Content interface for marshaling
}

OSPFv2Packet wrapper implements SerializeTo. Make it possible to serialize an OSPF message to wire format

func (*OSPFv2Packet[T]) GetType 

func (v2 *OSPFv2Packet[T]) GetType() layers.OSPFType

func (*OSPFv2Packet[T]) SerializeTo 

func (v2 *OSPFv2Packet[T]) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) (err error)

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

func (*OSPFv2Packet[T]) String 

func (v2 *OSPFv2Packet[T]) String() string

type RouterV2 

type RouterV2 struct {
	layers.RouterV2
	TOSNum uint8
	TOSs   []LegacyTOSInfo
}

func (RouterV2) SerializeToSizedBuffer 

func (p RouterV2) SerializeToSizedBuffer(b []byte) (err error)

func (RouterV2) Size 

func (p RouterV2) Size() int

func (RouterV2) String 

func (p RouterV2) String() string

type SerializableLayerLayerWithType 

type SerializableLayerLayerWithType interface {
	gopacket.SerializableLayer
	GetType() layers.OSPFType
}

type V2ASExternalLSA 

type V2ASExternalLSA layers.ASExternalLSAV2

func (V2ASExternalLSA) SerializeToSizedBuffer 

func (p V2ASExternalLSA) SerializeToSizedBuffer(b []byte) (err error)

func (V2ASExternalLSA) Size 

func (p V2ASExternalLSA) Size() int

func (V2ASExternalLSA) String 

func (p V2ASExternalLSA) String() string

type V2NetworkLSA 

type V2NetworkLSA layers.NetworkLSAV2

func (V2NetworkLSA) SerializeToSizedBuffer 

func (p V2NetworkLSA) SerializeToSizedBuffer(b []byte) (err error)

func (V2NetworkLSA) Size 

func (p V2NetworkLSA) Size() int

func (V2NetworkLSA) String 

func (p V2NetworkLSA) String() string

type V2RouterLSA 

type V2RouterLSA struct {
	layers.RouterLSAV2
	Routers []RouterV2
}

func (V2RouterLSA) SerializeToSizedBuffer 

func (p V2RouterLSA) SerializeToSizedBuffer(b []byte) (err error)

func (V2RouterLSA) Size 

func (p V2RouterLSA) Size() int

func (V2RouterLSA) String 

func (p V2RouterLSA) String() string

type V2SummaryLSAImpl 

type V2SummaryLSAImpl struct {
	// For Type 3 summary-LSAs, this indicates the destination
	// network's IP address mask.  For example, when advertising the
	// location of a class A network the value 0xff000000 would be
	// used.  This field is not meaningful and must be zero for Type 4
	// summary-LSAs.
	NetworkMask uint32
	// The cost of this route.  Expressed in the same units as the
	// interface costs in the router-LSAs.
	// Only the lower 3 bytes are used.
	Metric uint32
}

V2SummaryLSAImpl implements summary LSA marshaling. The format of Type 3 and 4 summary-LSAs is identical.

func (V2SummaryLSAImpl) SerializeToSizedBuffer 

func (p V2SummaryLSAImpl) SerializeToSizedBuffer(b []byte) (err error)

func (V2SummaryLSAImpl) Size 

func (p V2SummaryLSAImpl) Size() int

func (V2SummaryLSAImpl) String 

func (p V2SummaryLSAImpl) String() string

type V2SummaryLSAType3 

type V2SummaryLSAType3 struct {
	V2SummaryLSAImpl
}

V2SummaryLSAType3 is alson known as ABR-SummaryLSA or SummaryLSA-IPNetwork. The format of Type 3 and 4 summary-LSAs is identical.

func (V2SummaryLSAType3) String 

func (p V2SummaryLSAType3) String() string

type V2SummaryLSAType4 

type V2SummaryLSAType4 struct {
	V2SummaryLSAImpl
}

V2SummaryLSAType4 is also known as ASBR-Summary LSA. The format of Type 3 and 4 summary-LSAs is identical.

func (V2SummaryLSAType4) String 

func (p V2SummaryLSAType4) String() string

Source Files

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