ODPM 266: Go-libmemif + 2 examples.

Change-Id: Icdb9b9eb2314eff6c96afe7996fcf2728291de4a
Signed-off-by: Milan Lenco <milan.lenco@pantheon.tech>

1 files changed, 122 insertions, 0 deletions

diff --git a/vendor/github.com/google/gopacket/layers/ethernet.go b/vendor/github.com/google/gopacket/layers/ethernet.go
new file mode 100644
index 0000000..4eebf8c
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/ethernet.go
@@ -0,0 +1,122 @@
+// 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"
+	"github.com/google/gopacket"
+	"net"
+)
+
+// EthernetBroadcast is the broadcast MAC address used by Ethernet.
+var EthernetBroadcast = net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
+
+// Ethernet is the layer for Ethernet frame headers.
+type Ethernet struct {
+	BaseLayer
+	SrcMAC, DstMAC net.HardwareAddr
+	EthernetType   EthernetType
+	// Length is only set if a length field exists within this header.  Ethernet
+	// headers follow two different standards, one that uses an EthernetType, the
+	// other which defines a length the follows with a LLC header (802.3).  If the
+	// former is the case, we set EthernetType and Length stays 0.  In the latter
+	// case, we set Length and EthernetType = EthernetTypeLLC.
+	Length uint16
+}
+
+// LayerType returns LayerTypeEthernet
+func (e *Ethernet) LayerType() gopacket.LayerType { return LayerTypeEthernet }
+
+func (e *Ethernet) LinkFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointMAC, e.SrcMAC, e.DstMAC)
+}
+
+func (eth *Ethernet) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 14 {
+		return errors.New("Ethernet packet too small")
+	}
+	eth.DstMAC = net.HardwareAddr(data[0:6])
+	eth.SrcMAC = net.HardwareAddr(data[6:12])
+	eth.EthernetType = EthernetType(binary.BigEndian.Uint16(data[12:14]))
+	eth.BaseLayer = BaseLayer{data[:14], data[14:]}
+	if eth.EthernetType < 0x0600 {
+		eth.Length = uint16(eth.EthernetType)
+		eth.EthernetType = EthernetTypeLLC
+		if cmp := len(eth.Payload) - int(eth.Length); cmp < 0 {
+			df.SetTruncated()
+		} else if cmp > 0 {
+			// Strip off bytes at the end, since we have too many bytes
+			eth.Payload = eth.Payload[:len(eth.Payload)-cmp]
+		}
+		//	fmt.Println(eth)
+	}
+	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 (eth *Ethernet) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if len(eth.DstMAC) != 6 {
+		return fmt.Errorf("invalid dst MAC: %v", eth.DstMAC)
+	}
+	if len(eth.SrcMAC) != 6 {
+		return fmt.Errorf("invalid src MAC: %v", eth.SrcMAC)
+	}
+	payload := b.Bytes()
+	bytes, err := b.PrependBytes(14)
+	if err != nil {
+		return err
+	}
+	copy(bytes, eth.DstMAC)
+	copy(bytes[6:], eth.SrcMAC)
+	if eth.Length != 0 || eth.EthernetType == EthernetTypeLLC {
+		if opts.FixLengths {
+			eth.Length = uint16(len(payload))
+		}
+		if eth.EthernetType != EthernetTypeLLC {
+			return fmt.Errorf("ethernet type %v not compatible with length value %v", eth.EthernetType, eth.Length)
+		} else if eth.Length > 0x0600 {
+			return fmt.Errorf("invalid ethernet length %v", eth.Length)
+		}
+		binary.BigEndian.PutUint16(bytes[12:], eth.Length)
+	} else {
+		binary.BigEndian.PutUint16(bytes[12:], uint16(eth.EthernetType))
+	}
+	length := len(b.Bytes())
+	if length < 60 {
+		// Pad out to 60 bytes.
+		padding, err := b.AppendBytes(60 - length)
+		if err != nil {
+			return err
+		}
+		copy(padding, lotsOfZeros[:])
+	}
+	return nil
+}
+
+func (eth *Ethernet) CanDecode() gopacket.LayerClass {
+	return LayerTypeEthernet
+}
+
+func (eth *Ethernet) NextLayerType() gopacket.LayerType {
+	return eth.EthernetType.LayerType()
+}
+
+func decodeEthernet(data []byte, p gopacket.PacketBuilder) error {
+	eth := &Ethernet{}
+	err := eth.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(eth)
+	p.SetLinkLayer(eth)
+	return p.NextDecoder(eth.EthernetType)
+}