cookie_hash
((cookie_hash(saddr, daddr, sport, dport, count, 1) + data)
cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0) + sseq;
cookie_hash(saddr, daddr, sport, dport, count - diff, 1))
return (cookie_hash(saddr, daddr, sport, dport, 0, 0) +
return (cookie_hash(saddr, daddr, sport, dport, 0, 0) +
((cookie_hash(saddr, daddr, sport, dport, count, 1) + data)
cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0) + sseq;
cookie_hash(saddr, daddr, sport, dport, count - diff, 1))