[VOL-1349] EPON OLT adapter (package B)
Change-Id: I634ef62c53813dcf4456f54948f13e06358e263c
diff --git a/vendor/github.com/google/gopacket/layers/ospf.go b/vendor/github.com/google/gopacket/layers/ospf.go
new file mode 100644
index 0000000..f3f2ca9
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/ospf.go
@@ -0,0 +1,680 @@
+// Copyright 2017 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+ "encoding/binary"
+ "fmt"
+
+ "github.com/google/gopacket"
+)
+
+// OSPFType denotes what kind of OSPF type it is
+type OSPFType uint8
+
+// Potential values for OSPF.Type.
+const (
+ OSPFHello OSPFType = 1
+ OSPFDatabaseDescription OSPFType = 2
+ OSPFLinkStateRequest OSPFType = 3
+ OSPFLinkStateUpdate OSPFType = 4
+ OSPFLinkStateAcknowledgment OSPFType = 5
+)
+
+// LSA Function Codes for LSAheader.LSType
+const (
+ RouterLSAtypeV2 = 0x1
+ RouterLSAtype = 0x2001
+ NetworkLSAtypeV2 = 0x2
+ NetworkLSAtype = 0x2002
+ SummaryLSANetworktypeV2 = 0x3
+ InterAreaPrefixLSAtype = 0x2003
+ SummaryLSAASBRtypeV2 = 0x4
+ InterAreaRouterLSAtype = 0x2004
+ ASExternalLSAtypeV2 = 0x5
+ ASExternalLSAtype = 0x4005
+ NSSALSAtype = 0x2007
+ LinkLSAtype = 0x0008
+ IntraAreaPrefixLSAtype = 0x2009
+)
+
+// String conversions for OSPFType
+func (i OSPFType) String() string {
+ switch i {
+ case OSPFHello:
+ return "Hello"
+ case OSPFDatabaseDescription:
+ return "Database Description"
+ case OSPFLinkStateRequest:
+ return "Link State Request"
+ case OSPFLinkStateUpdate:
+ return "Link State Update"
+ case OSPFLinkStateAcknowledgment:
+ return "Link State Acknowledgment"
+ default:
+ return ""
+ }
+}
+
+// Prefix extends IntraAreaPrefixLSA
+type Prefix struct {
+ PrefixLength uint8
+ PrefixOptions uint8
+ Metric uint16
+ AddressPrefix []byte
+}
+
+// IntraAreaPrefixLSA is the struct from RFC 5340 A.4.10.
+type IntraAreaPrefixLSA struct {
+ NumOfPrefixes uint16
+ RefLSType uint16
+ RefLinkStateID uint32
+ RefAdvRouter uint32
+ Prefixes []Prefix
+}
+
+// LinkLSA is the struct from RFC 5340 A.4.9.
+type LinkLSA struct {
+ RtrPriority uint8
+ Options uint32
+ LinkLocalAddress []byte
+ NumOfPrefixes uint32
+ Prefixes []Prefix
+}
+
+// ASExternalLSAV2 is the struct from RFC 2328 A.4.5.
+type ASExternalLSAV2 struct {
+ NetworkMask uint32
+ ExternalBit uint8
+ Metric uint32
+ ForwardingAddress uint32
+ ExternalRouteTag uint32
+}
+
+// ASExternalLSA is the struct from RFC 5340 A.4.7.
+type ASExternalLSA struct {
+ Flags uint8
+ Metric uint32
+ PrefixLength uint8
+ PrefixOptions uint8
+ RefLSType uint16
+ AddressPrefix []byte
+ ForwardingAddress []byte
+ ExternalRouteTag uint32
+ RefLinkStateID uint32
+}
+
+// InterAreaRouterLSA is the struct from RFC 5340 A.4.6.
+type InterAreaRouterLSA struct {
+ Options uint32
+ Metric uint32
+ DestinationRouterID uint32
+}
+
+// InterAreaPrefixLSA is the struct from RFC 5340 A.4.5.
+type InterAreaPrefixLSA struct {
+ Metric uint32
+ PrefixLength uint8
+ PrefixOptions uint8
+ AddressPrefix []byte
+}
+
+// NetworkLSA is the struct from RFC 5340 A.4.4.
+type NetworkLSA struct {
+ Options uint32
+ AttachedRouter []uint32
+}
+
+// RouterV2 extends RouterLSAV2
+type RouterV2 struct {
+ Type uint8
+ LinkID uint32
+ LinkData uint32
+ Metric uint16
+}
+
+// RouterLSAV2 is the struct from RFC 2328 A.4.2.
+type RouterLSAV2 struct {
+ Flags uint8
+ Links uint16
+ Routers []RouterV2
+}
+
+// Router extends RouterLSA
+type Router struct {
+ Type uint8
+ Metric uint16
+ InterfaceID uint32
+ NeighborInterfaceID uint32
+ NeighborRouterID uint32
+}
+
+// RouterLSA is the struct from RFC 5340 A.4.3.
+type RouterLSA struct {
+ Flags uint8
+ Options uint32
+ Routers []Router
+}
+
+// LSAheader is the struct from RFC 5340 A.4.2 and RFC 2328 A.4.1.
+type LSAheader struct {
+ LSAge uint16
+ LSType uint16
+ LinkStateID uint32
+ AdvRouter uint32
+ LSSeqNumber uint32
+ LSChecksum uint16
+ Length uint16
+ LSOptions uint8
+}
+
+// LSA links LSAheader with the structs from RFC 5340 A.4.
+type LSA struct {
+ LSAheader
+ Content interface{}
+}
+
+// LSUpdate is the struct from RFC 5340 A.3.5.
+type LSUpdate struct {
+ NumOfLSAs uint32
+ LSAs []LSA
+}
+
+// LSReq is the struct from RFC 5340 A.3.4.
+type LSReq struct {
+ LSType uint16
+ LSID uint32
+ AdvRouter uint32
+}
+
+// DbDescPkg is the struct from RFC 5340 A.3.3.
+type DbDescPkg struct {
+ Options uint32
+ InterfaceMTU uint16
+ Flags uint16
+ DDSeqNumber uint32
+ LSAinfo []LSAheader
+}
+
+// HelloPkg is the struct from RFC 5340 A.3.2.
+type HelloPkg struct {
+ InterfaceID uint32
+ RtrPriority uint8
+ Options uint32
+ HelloInterval uint16
+ RouterDeadInterval uint32
+ DesignatedRouterID uint32
+ BackupDesignatedRouterID uint32
+ NeighborID []uint32
+}
+
+// HelloPkgV2 extends the HelloPkg struct with OSPFv2 information
+type HelloPkgV2 struct {
+ HelloPkg
+ NetworkMask uint32
+}
+
+// OSPF is a basic OSPF packet header with common fields of Version 2 and Version 3.
+type OSPF struct {
+ Version uint8
+ Type OSPFType
+ PacketLength uint16
+ RouterID uint32
+ AreaID uint32
+ Checksum uint16
+ Content interface{}
+}
+
+//OSPFv2 extend the OSPF head with version 2 specific fields
+type OSPFv2 struct {
+ BaseLayer
+ OSPF
+ AuType uint16
+ Authentication uint64
+}
+
+// OSPFv3 extend the OSPF head with version 3 specific fields
+type OSPFv3 struct {
+ BaseLayer
+ OSPF
+ Instance uint8
+ Reserved uint8
+}
+
+// getLSAsv2 parses the LSA information from the packet for OSPFv2
+func getLSAsv2(num uint32, data []byte) ([]LSA, error) {
+ var lsas []LSA
+ var i uint32 = 0
+ var offset uint32 = 0
+ for ; i < num; i++ {
+ lstype := uint16(data[offset+3])
+ lsalength := binary.BigEndian.Uint16(data[offset+18 : offset+20])
+ content, err := extractLSAInformation(lstype, lsalength, data[offset:])
+ if err != nil {
+ return nil, fmt.Errorf("Could not extract Link State type.")
+ }
+ lsa := LSA{
+ LSAheader: LSAheader{
+ LSAge: binary.BigEndian.Uint16(data[offset : offset+2]),
+ LSOptions: data[offset+2],
+ LSType: lstype,
+ LinkStateID: binary.BigEndian.Uint32(data[offset+4 : offset+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[offset+8 : offset+12]),
+ LSSeqNumber: binary.BigEndian.Uint32(data[offset+12 : offset+16]),
+ LSChecksum: binary.BigEndian.Uint16(data[offset+16 : offset+18]),
+ Length: lsalength,
+ },
+ Content: content,
+ }
+ lsas = append(lsas, lsa)
+ offset += uint32(lsalength)
+ }
+ return lsas, nil
+}
+
+// extractLSAInformation extracts all the LSA information
+func extractLSAInformation(lstype, lsalength uint16, data []byte) (interface{}, error) {
+ if lsalength < 20 {
+ return nil, fmt.Errorf("Link State header length %v too short, %v required", lsalength, 20)
+ }
+ if len(data) < int(lsalength) {
+ return nil, fmt.Errorf("Link State header length %v too short, %v required", len(data), lsalength)
+ }
+ var content interface{}
+ switch lstype {
+ case RouterLSAtypeV2:
+ var routers []RouterV2
+ links := binary.BigEndian.Uint16(data[22:24])
+ content = RouterLSAV2{
+ Flags: data[20],
+ Links: links,
+ Routers: routers,
+ }
+ case ASExternalLSAtypeV2:
+ content = ASExternalLSAV2{
+ NetworkMask: binary.BigEndian.Uint32(data[20:24]),
+ ExternalBit: data[24] & 0x80,
+ Metric: binary.BigEndian.Uint32(data[24:28]) & 0x00FFFFFF,
+ ForwardingAddress: binary.BigEndian.Uint32(data[28:32]),
+ ExternalRouteTag: binary.BigEndian.Uint32(data[32:36]),
+ }
+ case RouterLSAtype:
+ var routers []Router
+ var j uint32
+ for j = 24; j < uint32(lsalength); j += 16 {
+ router := Router{
+ Type: uint8(data[j]),
+ Metric: binary.BigEndian.Uint16(data[j+2 : j+4]),
+ InterfaceID: binary.BigEndian.Uint32(data[j+4 : j+8]),
+ NeighborInterfaceID: binary.BigEndian.Uint32(data[j+8 : j+12]),
+ NeighborRouterID: binary.BigEndian.Uint32(data[j+12 : j+16]),
+ }
+ routers = append(routers, router)
+ }
+ content = RouterLSA{
+ Flags: uint8(data[20]),
+ Options: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+ Routers: routers,
+ }
+ case NetworkLSAtype:
+ var routers []uint32
+ var j uint32
+ for j = 24; j < uint32(lsalength); j += 4 {
+ routers = append(routers, binary.BigEndian.Uint32(data[j:j+4]))
+ }
+ content = NetworkLSA{
+ Options: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+ AttachedRouter: routers,
+ }
+ case InterAreaPrefixLSAtype:
+ content = InterAreaPrefixLSA{
+ Metric: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+ PrefixLength: uint8(data[24]),
+ PrefixOptions: uint8(data[25]),
+ AddressPrefix: data[28:uint32(lsalength)],
+ }
+ case InterAreaRouterLSAtype:
+ content = InterAreaRouterLSA{
+ Options: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+ Metric: binary.BigEndian.Uint32(data[24:28]) & 0x00FFFFFF,
+ DestinationRouterID: binary.BigEndian.Uint32(data[28:32]),
+ }
+ case ASExternalLSAtype:
+ fallthrough
+ case NSSALSAtype:
+
+ flags := uint8(data[20])
+ prefixLen := uint8(data[24]) / 8
+ var forwardingAddress []byte
+ if (flags & 0x02) == 0x02 {
+ forwardingAddress = data[28+uint32(prefixLen) : 28+uint32(prefixLen)+16]
+ }
+ content = ASExternalLSA{
+ Flags: flags,
+ Metric: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+ PrefixLength: prefixLen,
+ PrefixOptions: uint8(data[25]),
+ RefLSType: binary.BigEndian.Uint16(data[26:28]),
+ AddressPrefix: data[28 : 28+uint32(prefixLen)],
+ ForwardingAddress: forwardingAddress,
+ }
+ case LinkLSAtype:
+ var prefixes []Prefix
+ var prefixOffset uint32 = 44
+ var j uint32
+ numOfPrefixes := binary.BigEndian.Uint32(data[40:44])
+ for j = 0; j < numOfPrefixes; j++ {
+ prefixLen := uint8(data[prefixOffset])
+ prefix := Prefix{
+ PrefixLength: prefixLen,
+ PrefixOptions: uint8(data[prefixOffset+1]),
+ AddressPrefix: data[prefixOffset+4 : prefixOffset+4+uint32(prefixLen)/8],
+ }
+ prefixes = append(prefixes, prefix)
+ prefixOffset = prefixOffset + 4 + uint32(prefixLen)/8
+ }
+ content = LinkLSA{
+ RtrPriority: uint8(data[20]),
+ Options: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+ LinkLocalAddress: data[24:40],
+ NumOfPrefixes: numOfPrefixes,
+ Prefixes: prefixes,
+ }
+ case IntraAreaPrefixLSAtype:
+ var prefixes []Prefix
+ var prefixOffset uint32 = 32
+ var j uint16
+ numOfPrefixes := binary.BigEndian.Uint16(data[20:22])
+ for j = 0; j < numOfPrefixes; j++ {
+ prefixLen := uint8(data[prefixOffset])
+ prefix := Prefix{
+ PrefixLength: prefixLen,
+ PrefixOptions: uint8(data[prefixOffset+1]),
+ Metric: binary.BigEndian.Uint16(data[prefixOffset+2 : prefixOffset+4]),
+ AddressPrefix: data[prefixOffset+4 : prefixOffset+4+uint32(prefixLen)/8],
+ }
+ prefixes = append(prefixes, prefix)
+ prefixOffset = prefixOffset + 4 + uint32(prefixLen)
+ }
+ content = IntraAreaPrefixLSA{
+ NumOfPrefixes: numOfPrefixes,
+ RefLSType: binary.BigEndian.Uint16(data[22:24]),
+ RefLinkStateID: binary.BigEndian.Uint32(data[24:28]),
+ RefAdvRouter: binary.BigEndian.Uint32(data[28:32]),
+ Prefixes: prefixes,
+ }
+ default:
+ return nil, fmt.Errorf("Unknown Link State type.")
+ }
+ return content, nil
+}
+
+// getLSAs parses the LSA information from the packet for OSPFv3
+func getLSAs(num uint32, data []byte) ([]LSA, error) {
+ var lsas []LSA
+ var i uint32 = 0
+ var offset uint32 = 0
+ for ; i < num; i++ {
+ var content interface{}
+ lstype := binary.BigEndian.Uint16(data[offset+2 : offset+4])
+ lsalength := binary.BigEndian.Uint16(data[offset+18 : offset+20])
+
+ content, err := extractLSAInformation(lstype, lsalength, data[offset:])
+ if err != nil {
+ return nil, fmt.Errorf("Could not extract Link State type.")
+ }
+ lsa := LSA{
+ LSAheader: LSAheader{
+ LSAge: binary.BigEndian.Uint16(data[offset : offset+2]),
+ LSType: lstype,
+ LinkStateID: binary.BigEndian.Uint32(data[offset+4 : offset+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[offset+8 : offset+12]),
+ LSSeqNumber: binary.BigEndian.Uint32(data[offset+12 : offset+16]),
+ LSChecksum: binary.BigEndian.Uint16(data[offset+16 : offset+18]),
+ Length: lsalength,
+ },
+ Content: content,
+ }
+ lsas = append(lsas, lsa)
+ offset += uint32(lsalength)
+ }
+ return lsas, nil
+}
+
+// DecodeFromBytes decodes the given bytes into the OSPF layer.
+func (ospf *OSPFv2) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+ if len(data) < 24 {
+ return fmt.Errorf("Packet too smal for OSPF Version 2")
+ }
+
+ ospf.Version = uint8(data[0])
+ ospf.Type = OSPFType(data[1])
+ ospf.PacketLength = binary.BigEndian.Uint16(data[2:4])
+ ospf.RouterID = binary.BigEndian.Uint32(data[4:8])
+ ospf.AreaID = binary.BigEndian.Uint32(data[8:12])
+ ospf.Checksum = binary.BigEndian.Uint16(data[12:14])
+ ospf.AuType = binary.BigEndian.Uint16(data[14:16])
+ ospf.Authentication = binary.BigEndian.Uint64(data[16:24])
+
+ switch ospf.Type {
+ case OSPFHello:
+ var neighbors []uint32
+ for i := 44; uint16(i+4) <= ospf.PacketLength; i += 4 {
+ neighbors = append(neighbors, binary.BigEndian.Uint32(data[i:i+4]))
+ }
+ ospf.Content = HelloPkgV2{
+ NetworkMask: binary.BigEndian.Uint32(data[24:28]),
+ HelloPkg: HelloPkg{
+ HelloInterval: binary.BigEndian.Uint16(data[28:30]),
+ Options: uint32(data[30]),
+ RtrPriority: uint8(data[31]),
+ RouterDeadInterval: binary.BigEndian.Uint32(data[32:36]),
+ DesignatedRouterID: binary.BigEndian.Uint32(data[36:40]),
+ BackupDesignatedRouterID: binary.BigEndian.Uint32(data[40:44]),
+ NeighborID: neighbors,
+ },
+ }
+ case OSPFDatabaseDescription:
+ var lsas []LSAheader
+ for i := 32; uint16(i+20) <= ospf.PacketLength; i += 20 {
+ lsa := LSAheader{
+ LSAge: binary.BigEndian.Uint16(data[i : i+2]),
+ LSType: binary.BigEndian.Uint16(data[i+2 : i+4]),
+ LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+ LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+ LSChecksum: binary.BigEndian.Uint16(data[i+16 : i+18]),
+ Length: binary.BigEndian.Uint16(data[i+18 : i+20]),
+ }
+ lsas = append(lsas, lsa)
+ }
+ ospf.Content = DbDescPkg{
+ InterfaceMTU: binary.BigEndian.Uint16(data[24:26]),
+ Options: uint32(data[26]),
+ Flags: uint16(data[27]),
+ DDSeqNumber: binary.BigEndian.Uint32(data[28:32]),
+ LSAinfo: lsas,
+ }
+ case OSPFLinkStateRequest:
+ var lsrs []LSReq
+ for i := 24; uint16(i+12) <= ospf.PacketLength; i += 12 {
+ lsr := LSReq{
+ LSType: binary.BigEndian.Uint16(data[i+2 : i+4]),
+ LSID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+ }
+ lsrs = append(lsrs, lsr)
+ }
+ ospf.Content = lsrs
+ case OSPFLinkStateUpdate:
+ num := binary.BigEndian.Uint32(data[24:28])
+
+ lsas, err := getLSAsv2(num, data[28:])
+ if err != nil {
+ return fmt.Errorf("Cannot parse Link State Update packet: %v", err)
+ }
+ ospf.Content = LSUpdate{
+ NumOfLSAs: num,
+ LSAs: lsas,
+ }
+ case OSPFLinkStateAcknowledgment:
+ var lsas []LSAheader
+ for i := 24; uint16(i+20) <= ospf.PacketLength; i += 20 {
+ lsa := LSAheader{
+ LSAge: binary.BigEndian.Uint16(data[i : i+2]),
+ LSOptions: data[i+2],
+ LSType: uint16(data[i+3]),
+ LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+ LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+ LSChecksum: binary.BigEndian.Uint16(data[i+16 : i+18]),
+ Length: binary.BigEndian.Uint16(data[i+18 : i+20]),
+ }
+ lsas = append(lsas, lsa)
+ }
+ ospf.Content = lsas
+ }
+ return nil
+}
+
+// DecodeFromBytes decodes the given bytes into the OSPF layer.
+func (ospf *OSPFv3) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+
+ if len(data) < 16 {
+ return fmt.Errorf("Packet too smal for OSPF Version 3")
+ }
+
+ ospf.Version = uint8(data[0])
+ ospf.Type = OSPFType(data[1])
+ ospf.PacketLength = binary.BigEndian.Uint16(data[2:4])
+ ospf.RouterID = binary.BigEndian.Uint32(data[4:8])
+ ospf.AreaID = binary.BigEndian.Uint32(data[8:12])
+ ospf.Checksum = binary.BigEndian.Uint16(data[12:14])
+ ospf.Instance = uint8(data[14])
+ ospf.Reserved = uint8(data[15])
+
+ switch ospf.Type {
+ case OSPFHello:
+ var neighbors []uint32
+ for i := 36; uint16(i+4) <= ospf.PacketLength; i += 4 {
+ neighbors = append(neighbors, binary.BigEndian.Uint32(data[i:i+4]))
+ }
+ ospf.Content = HelloPkg{
+ InterfaceID: binary.BigEndian.Uint32(data[16:20]),
+ RtrPriority: uint8(data[20]),
+ Options: binary.BigEndian.Uint32(data[21:25]) >> 8,
+ HelloInterval: binary.BigEndian.Uint16(data[24:26]),
+ RouterDeadInterval: uint32(binary.BigEndian.Uint16(data[26:28])),
+ DesignatedRouterID: binary.BigEndian.Uint32(data[28:32]),
+ BackupDesignatedRouterID: binary.BigEndian.Uint32(data[32:36]),
+ NeighborID: neighbors,
+ }
+ case OSPFDatabaseDescription:
+ var lsas []LSAheader
+ for i := 28; uint16(i+20) <= ospf.PacketLength; i += 20 {
+ lsa := LSAheader{
+ LSAge: binary.BigEndian.Uint16(data[i : i+2]),
+ LSType: binary.BigEndian.Uint16(data[i+2 : i+4]),
+ LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+ LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+ LSChecksum: binary.BigEndian.Uint16(data[i+16 : i+18]),
+ Length: binary.BigEndian.Uint16(data[i+18 : i+20]),
+ }
+ lsas = append(lsas, lsa)
+ }
+ ospf.Content = DbDescPkg{
+ Options: binary.BigEndian.Uint32(data[16:20]) & 0x00FFFFFF,
+ InterfaceMTU: binary.BigEndian.Uint16(data[20:22]),
+ Flags: binary.BigEndian.Uint16(data[22:24]),
+ DDSeqNumber: binary.BigEndian.Uint32(data[24:28]),
+ LSAinfo: lsas,
+ }
+ case OSPFLinkStateRequest:
+ var lsrs []LSReq
+ for i := 16; uint16(i+12) <= ospf.PacketLength; i += 12 {
+ lsr := LSReq{
+ LSType: binary.BigEndian.Uint16(data[i+2 : i+4]),
+ LSID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+ }
+ lsrs = append(lsrs, lsr)
+ }
+ ospf.Content = lsrs
+ case OSPFLinkStateUpdate:
+ num := binary.BigEndian.Uint32(data[16:20])
+ lsas, err := getLSAs(num, data[20:])
+ if err != nil {
+ return fmt.Errorf("Cannot parse Link State Update packet: %v", err)
+ }
+ ospf.Content = LSUpdate{
+ NumOfLSAs: num,
+ LSAs: lsas,
+ }
+
+ case OSPFLinkStateAcknowledgment:
+ var lsas []LSAheader
+ for i := 16; uint16(i+20) <= ospf.PacketLength; i += 20 {
+ lsa := LSAheader{
+ LSAge: binary.BigEndian.Uint16(data[i : i+2]),
+ LSType: binary.BigEndian.Uint16(data[i+2 : i+4]),
+ LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+ AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+ LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+ LSChecksum: binary.BigEndian.Uint16(data[i+16 : i+18]),
+ Length: binary.BigEndian.Uint16(data[i+18 : i+20]),
+ }
+ lsas = append(lsas, lsa)
+ }
+ ospf.Content = lsas
+ default:
+ }
+
+ return nil
+}
+
+// LayerType returns LayerTypeOSPF
+func (ospf *OSPFv2) LayerType() gopacket.LayerType {
+ return LayerTypeOSPF
+}
+func (ospf *OSPFv3) LayerType() gopacket.LayerType {
+ return LayerTypeOSPF
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (ospf *OSPFv2) NextLayerType() gopacket.LayerType {
+ return gopacket.LayerTypeZero
+}
+func (ospf *OSPFv3) NextLayerType() gopacket.LayerType {
+ return gopacket.LayerTypeZero
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (ospf *OSPFv2) CanDecode() gopacket.LayerClass {
+ return LayerTypeOSPF
+}
+func (ospf *OSPFv3) CanDecode() gopacket.LayerClass {
+ return LayerTypeOSPF
+}
+
+func decodeOSPF(data []byte, p gopacket.PacketBuilder) error {
+ if len(data) < 14 {
+ return fmt.Errorf("Packet too smal for OSPF")
+ }
+
+ switch uint8(data[0]) {
+ case 2:
+ ospf := &OSPFv2{}
+ return decodingLayerDecoder(ospf, data, p)
+ case 3:
+ ospf := &OSPFv3{}
+ return decodingLayerDecoder(ospf, data, p)
+ default:
+ }
+
+ return fmt.Errorf("Unable to determine OSPF type.")
+}