pub const TCP_FIN: u8 = 0x01;
pub const TCP_SYN: u8 = 0x02;
pub const TCP_RST: u8 = 0x04;
pub const TCP_PSH: u8 = 0x08;
pub const TCP_ACK: u8 = 0x10;
pub const TCP_URG: u8 = 0x20;
pub const TCP_ECE: u8 = 0x40;
pub const TCP_CWR: u8 = 0x80;
