diff --git a/vendor/github.com/google/gopacket/layers/prism.go b/vendor/github.com/google/gopacket/layers/prism.go
new file mode 100644
index 0000000..e1711e7
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/prism.go
@@ -0,0 +1,146 @@
+// Copyright 2015 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.
+
+// http://www.tcpdump.org/linktypes/LINKTYPE_IEEE802_11_PRISM.html
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+func decodePrismValue(data []byte, pv *PrismValue) {
+	pv.DID = PrismDID(binary.LittleEndian.Uint32(data[0:4]))
+	pv.Status = binary.LittleEndian.Uint16(data[4:6])
+	pv.Length = binary.LittleEndian.Uint16(data[6:8])
+	pv.Data = data[8 : 8+pv.Length]
+}
+
+type PrismDID uint32
+
+const (
+	PrismDIDType1HostTime                  PrismDID = 0x10044
+	PrismDIDType2HostTime                  PrismDID = 0x01041
+	PrismDIDType1MACTime                   PrismDID = 0x20044
+	PrismDIDType2MACTime                   PrismDID = 0x02041
+	PrismDIDType1Channel                   PrismDID = 0x30044
+	PrismDIDType2Channel                   PrismDID = 0x03041
+	PrismDIDType1RSSI                      PrismDID = 0x40044
+	PrismDIDType2RSSI                      PrismDID = 0x04041
+	PrismDIDType1SignalQuality             PrismDID = 0x50044
+	PrismDIDType2SignalQuality             PrismDID = 0x05041
+	PrismDIDType1Signal                    PrismDID = 0x60044
+	PrismDIDType2Signal                    PrismDID = 0x06041
+	PrismDIDType1Noise                     PrismDID = 0x70044
+	PrismDIDType2Noise                     PrismDID = 0x07041
+	PrismDIDType1Rate                      PrismDID = 0x80044
+	PrismDIDType2Rate                      PrismDID = 0x08041
+	PrismDIDType1TransmittedFrameIndicator PrismDID = 0x90044
+	PrismDIDType2TransmittedFrameIndicator PrismDID = 0x09041
+	PrismDIDType1FrameLength               PrismDID = 0xA0044
+	PrismDIDType2FrameLength               PrismDID = 0x0A041
+)
+
+const (
+	PrismType1MessageCode uint16 = 0x00000044
+	PrismType2MessageCode uint16 = 0x00000041
+)
+
+func (p PrismDID) String() string {
+	dids := map[PrismDID]string{
+		PrismDIDType1HostTime:                  "Host Time",
+		PrismDIDType2HostTime:                  "Host Time",
+		PrismDIDType1MACTime:                   "MAC Time",
+		PrismDIDType2MACTime:                   "MAC Time",
+		PrismDIDType1Channel:                   "Channel",
+		PrismDIDType2Channel:                   "Channel",
+		PrismDIDType1RSSI:                      "RSSI",
+		PrismDIDType2RSSI:                      "RSSI",
+		PrismDIDType1SignalQuality:             "Signal Quality",
+		PrismDIDType2SignalQuality:             "Signal Quality",
+		PrismDIDType1Signal:                    "Signal",
+		PrismDIDType2Signal:                    "Signal",
+		PrismDIDType1Noise:                     "Noise",
+		PrismDIDType2Noise:                     "Noise",
+		PrismDIDType1Rate:                      "Rate",
+		PrismDIDType2Rate:                      "Rate",
+		PrismDIDType1TransmittedFrameIndicator: "Transmitted Frame Indicator",
+		PrismDIDType2TransmittedFrameIndicator: "Transmitted Frame Indicator",
+		PrismDIDType1FrameLength:               "Frame Length",
+		PrismDIDType2FrameLength:               "Frame Length",
+	}
+
+	if str, ok := dids[p]; ok {
+		return str
+	}
+
+	return "Unknown DID"
+}
+
+type PrismValue struct {
+	DID    PrismDID
+	Status uint16
+	Length uint16
+	Data   []byte
+}
+
+func (pv *PrismValue) IsSupplied() bool {
+	return pv.Status == 1
+}
+
+var ErrPrismExpectedMoreData = errors.New("Expected more data.")
+var ErrPrismInvalidCode = errors.New("Invalid header code.")
+
+func decodePrismHeader(data []byte, p gopacket.PacketBuilder) error {
+	d := &PrismHeader{}
+	return decodingLayerDecoder(d, data, p)
+}
+
+type PrismHeader struct {
+	BaseLayer
+	Code       uint16
+	Length     uint16
+	DeviceName string
+	Values     []PrismValue
+}
+
+func (m *PrismHeader) LayerType() gopacket.LayerType { return LayerTypePrismHeader }
+
+func (m *PrismHeader) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	m.Code = binary.LittleEndian.Uint16(data[0:4])
+	m.Length = binary.LittleEndian.Uint16(data[4:8])
+	m.DeviceName = string(data[8:24])
+	m.BaseLayer = BaseLayer{Contents: data[:m.Length], Payload: data[m.Length:len(data)]}
+
+	switch m.Code {
+	case PrismType1MessageCode:
+		fallthrough
+	case PrismType2MessageCode:
+		// valid message code
+	default:
+		return ErrPrismInvalidCode
+	}
+
+	offset := uint16(24)
+
+	m.Values = make([]PrismValue, (m.Length-offset)/12)
+	for i := 0; i < len(m.Values); i++ {
+		decodePrismValue(data[offset:offset+12], &m.Values[i])
+		offset += 12
+	}
+
+	if offset != m.Length {
+		return ErrPrismExpectedMoreData
+	}
+
+	return nil
+}
+
+func (m *PrismHeader) CanDecode() gopacket.LayerClass    { return LayerTypePrismHeader }
+func (m *PrismHeader) NextLayerType() gopacket.LayerType { return LayerTypeDot11 }