impl From<std::net::SocketAddrV6> for SOCKADDR_IN6 {
    fn from(addr: std::net::SocketAddrV6) -> Self {
        // addr.port() and addr.flowinfo() are in host byte order
        // sin6_port and sin6_flowinfo must be big-endian, network byte order
        // sin6_scope_id is a bitfield without endianness
        SOCKADDR_IN6 {
            sin6_family: AF_INET6,
            sin6_port: addr.port().to_be(),
            sin6_flowinfo: addr.flowinfo().to_be(),
            sin6_addr: (*addr.ip()).into(),
            Anonymous: SOCKADDR_IN6_0 { sin6_scope_id: addr.scope_id() },
            ..Default::default()
        }
    }
}
