conn.Add fails on centos 7

[rouzier]

I received the following error. netfilter query: netlink receive: errno 4097

Here is how to replicate it.

package main

import (
    "fmt"
    "net"
    "github.com/digineo/go-ipset"
    "github.com/ti-mo/netfilter"
)

func main() {
    conn, _ := ipset.Dial( netfilter.ProtoUnspec, nil)
    setName := "testMe"
    typeResponse, err := conn.Type("hash:ip,port", netfilter.ProtoIPv4)
    if err != nil {
        fmt.Printf("Error getting type %s: %s\n", "hash:ip,port", err.Error())
    }

    err = conn.Destroy(setName)
    err = conn.Create(setName, "hash:ip,port", typeResponse.Revision.Value, netfilter.ProtoIPv4)
    if err != nil {
        fmt.Printf("Error creating %s %s\n", setName, err.Error())
    }
    err = conn.Add(
        setName,
        ipset.NewEntry(
            ipset.EntryIP(net.ParseIP("2.1.3.4")),
            ipset.EntryProto(17),
            ipset.EntryPort(53),
        ),
    )
    conn.Close()
    if err != nil {
        fmt.Printf("Error adding %s\n", err.Error())
    }
}