Function libpcapng_normalize_flow_direction 

pub unsafe extern "C" fn libpcapng_normalize_flow_direction(
    src_ip: u32,
    dst_ip: u32,
    src_port: u16,
    dst_port: u16,
    side_a_ip: *mut u32,
    side_b_ip: *mut u32,
    side_a_port: *mut u16,
    side_b_port: *mut u16,
) -> u8