Sending gopacket generated bytes

[justmumu]

Hi,

First of all thank you for this amazing project. I am trying to use in my project.
But i can't figure out how to generate packets with gopacket. Is this possible ?

I saw GeneratePacketFromByte function and I used with gopacket's bytes but I got error "wrong destination MAC address". I think somehow gopacket bytes is not suitable.

Example Code:

func generatePacketFromByte(emptyPacket *packet.Packet, context flow.UserContext) {
        srcMAC, _ := hex.DecodeString("xxx")
	dstMAC, _ := hex.DecodeString("xxx")

	eth := &layers.Ethernet{
		SrcMAC: net.HardwareAddr(srcMAC),
		DstMAC: net.HardwareAddr(dstMAC),
		EthernetType: layers.EthernetTypeIPv4,
	}
	ip := &layers.IPv4{
		Version: 4,
		IHL: 5,
		TTL: 64,
		Id: 0,
		Protocol: layers.IPProtocolUDP,
		SrcIP: net.ParseIP(SrcIP).To4(),
		DstIP: net.ParseIP(DstIP).To4(),
	}
	udp := &layers.UDP{
		SrcPort: layers.UDPPort(1234),
		DstPort: layers.UDPPort(1234),
	}
	udp.SetNetworkLayerForChecksum(ip)
        
        buf := gopacket.NewSerializeBuffer()
	opts := gopacket.SerializeOptions{
		FixLengths: true,
		ComputeChecksums: true,
	}
	err = gopacket.SerializeLayers(buf, opts, eth, ip, udp)
        if err != nil {
		panic(err)
	}

        packet.GeneratePacketFromByte(emptyPacket, buf.Bytes())
}

[aregm]

Hello @Rasity ! You can use https://github.com/intel-go/nff-go/blob/master/examples/gopacketParserExample.go as a reference. You just need to specify the source and destination MAC addresses correctly. There are builtin types so you can do something like this:

DAddr:     types.MACAddress{0x00, 0x40, 0x05, 0x40, 0xef, 0x24},
SAddr:     types.MACAddress{0x00, 0x60, 0x08, 0x9f, 0xb1, 0xf3},