Go에서 원시 소켓을 사용하여 사용자 정의 TCP 패킷을 만들고 보내는 방법은 무엇입니까?

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

package main

import (
    "code.google.com/p/gopacket"
    "code.google.com/p/gopacket/examples/util"
    "code.google.com/p/gopacket/layers"
    "github.com/dustin/go-ipv4"
    "log"
    "net"
)

const netaddr = "127.0.0.1:666"

func main() {
    defer util.Run()()

    // IPv4-specific operations
    srcIP := net.ParseIP("127.0.0.1")
    dstIP := net.ParseIP("192.168.0.1")

    // Raw socket creation using ipv4 package
    conn, err := ipv4.NewRawConn("ip4:tcp", netaddr, 0)
    if err != nil {
        log.Fatalf("NewRawConn: %s\n", err)
    }

    // TCP/IP packet creation
    tcpLayer := layers.TCP{
        SrcPort: layers.TCPPort(666),
        DstPort: layers.TCPPort(22),
        SYN:     true,
    }
    ipLayer := layers.IPv4{
        SrcIP:    srcIP,
        DstIP:    dstIP,
        Protocol: layers.IPProtocolTCP,
    }
    tcpLayer.SetNetworkLayerForChecksum(&ipLayer)

    // Serialize and transmit the packet
    buf := gopacket.NewSerializeBuffer()
    serializeOpts := gopacket.SerializeOptions{
        FixLengths:       true,
        ComputeChecksums: true,
    }
    err = gopacket.SerializeLayers(buf, serializeOpts, &ipLayer, &tcpLayer)
    if err != nil {
        log.Fatalf("SerializeLayers: %s\n", err)
    }

    _, err = conn.Write(buf.Bytes())
    if err != nil {
        log.Fatalf("Write: %s\n", err)
    }

    log.Print("Custom TCP packet sent!")
}