Function gnunet_sys::GNUNET_TUN_calculate_udp4_checksum

pub unsafe extern "C" fn GNUNET_TUN_calculate_udp4_checksum(
    ip: *const GNUNET_TUN_IPv4Header, 
    udp: *mut GNUNET_TUN_UdpHeader, 
    payload: *const c_void, 
    payload_length: u16
)

Calculate IPv4 UDP checksum.

@param ip ipv4 header fully initialized @param udp UDP header (initialized except for CRC) @param payload the UDP payload @param payload_length number of bytes of UDP @a payload