diff --git a/vendor/github.com/google/gopacket/layers/icmp4.go b/vendor/github.com/google/gopacket/layers/icmp4.go
new file mode 100644
index 0000000..bd3f03f
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/icmp4.go
@@ -0,0 +1,267 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. 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"
+	"fmt"
+	"reflect"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	ICMPv4TypeEchoReply              = 0
+	ICMPv4TypeDestinationUnreachable = 3
+	ICMPv4TypeSourceQuench           = 4
+	ICMPv4TypeRedirect               = 5
+	ICMPv4TypeEchoRequest            = 8
+	ICMPv4TypeRouterAdvertisement    = 9
+	ICMPv4TypeRouterSolicitation     = 10
+	ICMPv4TypeTimeExceeded           = 11
+	ICMPv4TypeParameterProblem       = 12
+	ICMPv4TypeTimestampRequest       = 13
+	ICMPv4TypeTimestampReply         = 14
+	ICMPv4TypeInfoRequest            = 15
+	ICMPv4TypeInfoReply              = 16
+	ICMPv4TypeAddressMaskRequest     = 17
+	ICMPv4TypeAddressMaskReply       = 18
+)
+
+const (
+	// DestinationUnreachable
+	ICMPv4CodeNet                 = 0
+	ICMPv4CodeHost                = 1
+	ICMPv4CodeProtocol            = 2
+	ICMPv4CodePort                = 3
+	ICMPv4CodeFragmentationNeeded = 4
+	ICMPv4CodeSourceRoutingFailed = 5
+	ICMPv4CodeNetUnknown          = 6
+	ICMPv4CodeHostUnknown         = 7
+	ICMPv4CodeSourceIsolated      = 8
+	ICMPv4CodeNetAdminProhibited  = 9
+	ICMPv4CodeHostAdminProhibited = 10
+	ICMPv4CodeNetTOS              = 11
+	ICMPv4CodeHostTOS             = 12
+	ICMPv4CodeCommAdminProhibited = 13
+	ICMPv4CodeHostPrecedence      = 14
+	ICMPv4CodePrecedenceCutoff    = 15
+
+	// TimeExceeded
+	ICMPv4CodeTTLExceeded                    = 0
+	ICMPv4CodeFragmentReassemblyTimeExceeded = 1
+
+	// ParameterProblem
+	ICMPv4CodePointerIndicatesError = 0
+	ICMPv4CodeMissingOption         = 1
+	ICMPv4CodeBadLength             = 2
+
+	// Redirect
+	// ICMPv4CodeNet  = same as for DestinationUnreachable
+	// ICMPv4CodeHost = same as for DestinationUnreachable
+	ICMPv4CodeTOSNet  = 2
+	ICMPv4CodeTOSHost = 3
+)
+
+type icmpv4TypeCodeInfoStruct struct {
+	typeStr string
+	codeStr *map[uint8]string
+}
+
+var (
+	icmpv4TypeCodeInfo = map[uint8]icmpv4TypeCodeInfoStruct{
+		ICMPv4TypeDestinationUnreachable: icmpv4TypeCodeInfoStruct{
+			"DestinationUnreachable", &map[uint8]string{
+				ICMPv4CodeNet:                 "Net",
+				ICMPv4CodeHost:                "Host",
+				ICMPv4CodeProtocol:            "Protocol",
+				ICMPv4CodePort:                "Port",
+				ICMPv4CodeFragmentationNeeded: "FragmentationNeeded",
+				ICMPv4CodeSourceRoutingFailed: "SourceRoutingFailed",
+				ICMPv4CodeNetUnknown:          "NetUnknown",
+				ICMPv4CodeHostUnknown:         "HostUnknown",
+				ICMPv4CodeSourceIsolated:      "SourceIsolated",
+				ICMPv4CodeNetAdminProhibited:  "NetAdminProhibited",
+				ICMPv4CodeHostAdminProhibited: "HostAdminProhibited",
+				ICMPv4CodeNetTOS:              "NetTOS",
+				ICMPv4CodeHostTOS:             "HostTOS",
+				ICMPv4CodeCommAdminProhibited: "CommAdminProhibited",
+				ICMPv4CodeHostPrecedence:      "HostPrecedence",
+				ICMPv4CodePrecedenceCutoff:    "PrecedenceCutoff",
+			},
+		},
+		ICMPv4TypeTimeExceeded: icmpv4TypeCodeInfoStruct{
+			"TimeExceeded", &map[uint8]string{
+				ICMPv4CodeTTLExceeded:                    "TTLExceeded",
+				ICMPv4CodeFragmentReassemblyTimeExceeded: "FragmentReassemblyTimeExceeded",
+			},
+		},
+		ICMPv4TypeParameterProblem: icmpv4TypeCodeInfoStruct{
+			"ParameterProblem", &map[uint8]string{
+				ICMPv4CodePointerIndicatesError: "PointerIndicatesError",
+				ICMPv4CodeMissingOption:         "MissingOption",
+				ICMPv4CodeBadLength:             "BadLength",
+			},
+		},
+		ICMPv4TypeSourceQuench: icmpv4TypeCodeInfoStruct{
+			"SourceQuench", nil,
+		},
+		ICMPv4TypeRedirect: icmpv4TypeCodeInfoStruct{
+			"Redirect", &map[uint8]string{
+				ICMPv4CodeNet:     "Net",
+				ICMPv4CodeHost:    "Host",
+				ICMPv4CodeTOSNet:  "TOS+Net",
+				ICMPv4CodeTOSHost: "TOS+Host",
+			},
+		},
+		ICMPv4TypeEchoRequest: icmpv4TypeCodeInfoStruct{
+			"EchoRequest", nil,
+		},
+		ICMPv4TypeEchoReply: icmpv4TypeCodeInfoStruct{
+			"EchoReply", nil,
+		},
+		ICMPv4TypeTimestampRequest: icmpv4TypeCodeInfoStruct{
+			"TimestampRequest", nil,
+		},
+		ICMPv4TypeTimestampReply: icmpv4TypeCodeInfoStruct{
+			"TimestampReply", nil,
+		},
+		ICMPv4TypeInfoRequest: icmpv4TypeCodeInfoStruct{
+			"InfoRequest", nil,
+		},
+		ICMPv4TypeInfoReply: icmpv4TypeCodeInfoStruct{
+			"InfoReply", nil,
+		},
+		ICMPv4TypeRouterSolicitation: icmpv4TypeCodeInfoStruct{
+			"RouterSolicitation", nil,
+		},
+		ICMPv4TypeRouterAdvertisement: icmpv4TypeCodeInfoStruct{
+			"RouterAdvertisement", nil,
+		},
+		ICMPv4TypeAddressMaskRequest: icmpv4TypeCodeInfoStruct{
+			"AddressMaskRequest", nil,
+		},
+		ICMPv4TypeAddressMaskReply: icmpv4TypeCodeInfoStruct{
+			"AddressMaskReply", nil,
+		},
+	}
+)
+
+type ICMPv4TypeCode uint16
+
+// Type returns the ICMPv4 type field.
+func (a ICMPv4TypeCode) Type() uint8 {
+	return uint8(a >> 8)
+}
+
+// Code returns the ICMPv4 code field.
+func (a ICMPv4TypeCode) Code() uint8 {
+	return uint8(a)
+}
+
+func (a ICMPv4TypeCode) String() string {
+	t, c := a.Type(), a.Code()
+	strInfo, ok := icmpv4TypeCodeInfo[t]
+	if !ok {
+		// Unknown ICMPv4 type field
+		return fmt.Sprintf("%d(%d)", t, c)
+	}
+	typeStr := strInfo.typeStr
+	if strInfo.codeStr == nil && c == 0 {
+		// The ICMPv4 type does not make use of the code field
+		return fmt.Sprintf("%s", strInfo.typeStr)
+	}
+	if strInfo.codeStr == nil && c != 0 {
+		// The ICMPv4 type does not make use of the code field, but it is present anyway
+		return fmt.Sprintf("%s(Code: %d)", typeStr, c)
+	}
+	codeStr, ok := (*strInfo.codeStr)[c]
+	if !ok {
+		// We don't know this ICMPv4 code; print the numerical value
+		return fmt.Sprintf("%s(Code: %d)", typeStr, c)
+	}
+	return fmt.Sprintf("%s(%s)", typeStr, codeStr)
+}
+
+func (a ICMPv4TypeCode) GoString() string {
+	t := reflect.TypeOf(a)
+	return fmt.Sprintf("%s(%d, %d)", t.String(), a.Type(), a.Code())
+}
+
+// SerializeTo writes the ICMPv4TypeCode value to the 'bytes' buffer.
+func (a ICMPv4TypeCode) SerializeTo(bytes []byte) {
+	binary.BigEndian.PutUint16(bytes, uint16(a))
+}
+
+// CreateICMPv4TypeCode is a convenience function to create an ICMPv4TypeCode
+// gopacket type from the ICMPv4 type and code values.
+func CreateICMPv4TypeCode(typ uint8, code uint8) ICMPv4TypeCode {
+	return ICMPv4TypeCode(binary.BigEndian.Uint16([]byte{typ, code}))
+}
+
+// ICMPv4 is the layer for IPv4 ICMP packet data.
+type ICMPv4 struct {
+	BaseLayer
+	TypeCode ICMPv4TypeCode
+	Checksum uint16
+	Id       uint16
+	Seq      uint16
+}
+
+// LayerType returns LayerTypeICMPv4.
+func (i *ICMPv4) LayerType() gopacket.LayerType { return LayerTypeICMPv4 }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv4) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 8 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 8 bytes for ICMPv4 packet")
+	}
+	i.TypeCode = CreateICMPv4TypeCode(data[0], data[1])
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.Id = binary.BigEndian.Uint16(data[4:6])
+	i.Seq = binary.BigEndian.Uint16(data[6:8])
+	i.BaseLayer = BaseLayer{data[:8], data[8:]}
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv4) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(8)
+	if err != nil {
+		return err
+	}
+	i.TypeCode.SerializeTo(bytes)
+	binary.BigEndian.PutUint16(bytes[4:], i.Id)
+	binary.BigEndian.PutUint16(bytes[6:], i.Seq)
+	if opts.ComputeChecksums {
+		bytes[2] = 0
+		bytes[3] = 0
+		i.Checksum = tcpipChecksum(b.Bytes(), 0)
+	}
+	binary.BigEndian.PutUint16(bytes[2:], i.Checksum)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv4) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv4
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv4) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+func decodeICMPv4(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv4{}
+	return decodingLayerDecoder(i, data, p)
+}