Function gnunet_sys::GNUNET_TUN_calculate_tcp4_checksum

pub unsafe extern "C" fn GNUNET_TUN_calculate_tcp4_checksum(
    ip: *const GNUNET_TUN_IPv4Header, 
    tcp: *mut GNUNET_TUN_TcpHeader, 
    payload: *const c_void, 
    payload_length: u16
)

Calculate IPv4 TCP checksum.

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