Too many goroutines created for relay udp

[linkerlin]

func (m *natmap) Add(peer net.Addr, dst, src net.PacketConn, srcIncluded bool) {
m.Set(peer.String(), src)

go func() {
timedCopy(dst, peer, src, m.timeout, srcIncluded)
if pc := m.Del(peer.String()); pc != nil {
pc.Close()
}
}()
}

Every udp packet need a goroutine.