[VOL-1349] EPON OLT adapter (package B)
Change-Id: I634ef62c53813dcf4456f54948f13e06358e263c
diff --git a/vendor/github.com/google/gopacket/layers/vrrp.go b/vendor/github.com/google/gopacket/layers/vrrp.go
new file mode 100644
index 0000000..ffaafe6
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/vrrp.go
@@ -0,0 +1,156 @@
+// Copyright 2016 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"
+ "errors"
+ "net"
+
+ "github.com/google/gopacket"
+)
+
+/*
+ This layer provides decoding for Virtual Router Redundancy Protocol (VRRP) v2.
+ https://tools.ietf.org/html/rfc3768#section-5
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Auth Type | Adver Int | Checksum |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | IP Address (1) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | . |
+ | . |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | IP Address (n) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Authentication Data (1) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Authentication Data (2) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+type VRRPv2Type uint8
+type VRRPv2AuthType uint8
+
+const (
+ VRRPv2Advertisement VRRPv2Type = 0x01 // router advertisement
+)
+
+// String conversions for VRRP message types
+func (v VRRPv2Type) String() string {
+ switch v {
+ case VRRPv2Advertisement:
+ return "VRRPv2 Advertisement"
+ default:
+ return ""
+ }
+}
+
+const (
+ VRRPv2AuthNoAuth VRRPv2AuthType = 0x00 // No Authentication
+ VRRPv2AuthReserved1 VRRPv2AuthType = 0x01 // Reserved field 1
+ VRRPv2AuthReserved2 VRRPv2AuthType = 0x02 // Reserved field 2
+)
+
+func (v VRRPv2AuthType) String() string {
+ switch v {
+ case VRRPv2AuthNoAuth:
+ return "No Authentication"
+ case VRRPv2AuthReserved1:
+ return "Reserved"
+ case VRRPv2AuthReserved2:
+ return "Reserved"
+ default:
+ return ""
+ }
+}
+
+// VRRPv2 represents an VRRP v2 message.
+type VRRPv2 struct {
+ BaseLayer
+ Version uint8 // The version field specifies the VRRP protocol version of this packet (v2)
+ Type VRRPv2Type // The type field specifies the type of this VRRP packet. The only type defined in v2 is ADVERTISEMENT
+ VirtualRtrID uint8 // identifies the virtual router this packet is reporting status for
+ Priority uint8 // specifies the sending VRRP router's priority for the virtual router (100 = default)
+ CountIPAddr uint8 // The number of IP addresses contained in this VRRP advertisement.
+ AuthType VRRPv2AuthType // identifies the authentication method being utilized
+ AdverInt uint8 // The Advertisement interval indicates the time interval (in seconds) between ADVERTISEMENTS. The default is 1 second
+ Checksum uint16 // used to detect data corruption in the VRRP message.
+ IPAddress []net.IP // one or more IP addresses associated with the virtual router. Specified in the CountIPAddr field.
+}
+
+// LayerType returns LayerTypeVRRP for VRRP v2 message.
+func (v *VRRPv2) LayerType() gopacket.LayerType { return LayerTypeVRRP }
+
+func (v *VRRPv2) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+
+ v.BaseLayer = BaseLayer{Contents: data[:len(data)]}
+ v.Version = data[0] >> 4 // high nibble == VRRP version. We're expecting v2
+
+ v.Type = VRRPv2Type(data[0] & 0x0F) // low nibble == VRRP type. Expecting 1 (advertisement)
+ if v.Type != 1 {
+ // rfc3768: A packet with unknown type MUST be discarded.
+ return errors.New("Unrecognized VRRPv2 type field.")
+ }
+
+ v.VirtualRtrID = data[1]
+ v.Priority = data[2]
+
+ v.CountIPAddr = data[3]
+ if v.CountIPAddr < 1 {
+ return errors.New("VRRPv2 number of IP addresses is not valid.")
+ }
+
+ v.AuthType = VRRPv2AuthType(data[4])
+ v.AdverInt = uint8(data[5])
+ v.Checksum = binary.BigEndian.Uint16(data[6:8])
+
+ // populate the IPAddress field. The number of addresses is specified in the v.CountIPAddr field
+ // offset references the starting byte containing the list of ip addresses
+ offset := 8
+ for i := uint8(0); i < v.CountIPAddr; i++ {
+ v.IPAddress = append(v.IPAddress, data[offset:offset+4])
+ offset += 4
+ }
+
+ // any trailing packets here may be authentication data and *should* be ignored in v2 as per RFC
+ //
+ // 5.3.10. Authentication Data
+ //
+ // The authentication string is currently only used to maintain
+ // backwards compatibility with RFC 2338. It SHOULD be set to zero on
+ // transmission and ignored on reception.
+ return nil
+}
+
+// CanDecode specifies the layer type in which we are attempting to unwrap.
+func (v *VRRPv2) CanDecode() gopacket.LayerClass {
+ return LayerTypeVRRP
+}
+
+// NextLayerType specifies the next layer that should be decoded. VRRP does not contain any further payload, so we set to 0
+func (v *VRRPv2) NextLayerType() gopacket.LayerType {
+ return gopacket.LayerTypeZero
+}
+
+// The VRRP packet does not include payload data. Setting byte slice to nil
+func (v *VRRPv2) Payload() []byte {
+ return nil
+}
+
+// decodeVRRP will parse VRRP v2
+func decodeVRRP(data []byte, p gopacket.PacketBuilder) error {
+ if len(data) < 8 {
+ return errors.New("Not a valid VRRP packet. Packet length is too small.")
+ }
+ v := &VRRPv2{}
+ return decodingLayerDecoder(v, data, p)
+}