Function tcp_md5_key_add

pub fn tcp_md5_key_add(
    src: SockAddr,
    dst: SockAddr,
    authstring: &str,
    valid_time: Duration,
) -> Result<(), Error>

Add a TCP-MD5 security association for the provided source and destination address with authstring as the key that is valid for valid_time after creation. If update is true, this is treated as an update to an existing association, otherwise a new association is created.