Golang と gopacket を使用して生の TCP パケットを作成して送信するにはどうすればよいですか?

// Example Packet Definition
import (
    "code.google.com/p/gopacket"
    "code.google.com/p/gopacket/examples/util"
    "code.google.com/p/gopacket/layers"
    "log"
    "net"
)

// Packet Data
srcIP := net.ParseIP("127.0.0.1")
dstIP := net.ParseIP("192.168.0.1")
ipLayer := layers.IPv4{
    SrcIP:    srcIP,
    DstIP:    dstIP,
    Protocol: layers.IPProtocolTCP,
}
tcpLayer := layers.TCP{
    SrcPort: layers.TCPPort(666),
    DstPort: layers.TCPPort(22),
    SYN:     true,
}

// Compute Checksums and Serialize Packet
tcpLayer.SetNetworkLayerForChecksum(&ipLayer)
buf := gopacket.NewSerializeBuffer()
err := gopacket.SerializeLayers(buf, gopacket.SerializeOptions{
    FixLengths:       true,
    ComputeChecksums: true,
}, &ipLayer, &tcpLayer)
if err != nil {
    panic(err)
}

conn, err := net.ListenIP("ip4:tcp", netaddr)
if err != nil {
    log.Fatalf("ListenIP: %s\n", err)
}

conn.SetsockoptIPHDRINCL(true)

_, err = conn.WriteTo(buf.Bytes(), &dstIPaddr)
if err != nil {
    panic(err)
}