You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: example_test.go
    path of file: ./repos/gitkube/vendor/golang.org/x/net/ipv6
    
    the code of the file until where you have to start completion: // Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package ipv6_test

import (
	"fmt"
	"log"
	"net"
	"os"
	"time"

	"golang.org/x/net/icmp"
	"golang.org/x/net/ipv6"
)

func ExampleConn_markingTCP() {
	ln, err := net.L
    
func ExamplePacketConn_advertisingOSPFHello() {
	c, err := net.ListenPacket("ip6:89", "::") // OSPF for IPv6
	if err != nil {
		log.Fatal(err)
	}
	defer c.Close()
	p := ipv6.NewPacketConn(c)

	en0, err := net.InterfaceByName("en0")
	if err != nil {
		log.Fatal(err)
	}
	allSPFRouters := net.IPAddr{IP: net.ParseIP("ff02::5")}
	if err := p.JoinGroup(en0, &allSPFRouters); err != nil {
		log.Fatal(err)
	}
	defer p.LeaveGroup(en0, &allSPFRouters)

	hello := make([]byte, 24) // fake hello data, you need to implement this
	ospf := make([]byte, 16)  // fake ospf header, you need to implement this
	ospf[0] = 3               // version 3
	ospf[1] = 1               // hello packet
	ospf = append(ospf, hello...)
	if err := p.SetChecksum(true, 12); err != nil {
		log.Fatal(err)
	}

	cm := ipv6.ControlMessage{
		TrafficClass: 0xc0, // DSCP CS6
		HopLimit:     1,
		IfIndex:      en0.Index,
	}
	if _, err := p.WriteTo(ospf, &cm, &allSPFRouters); err != nil {
		log.Fatal(err)
	}
}