taglinefilesource code
tcp_check812net/ipv4/tcp.cth->check = tcp_check(th, len, saddr, daddr,
tcp_check818net/ipv4/tcp.cth->check = tcp_check(th, len, saddr, daddr,
tcp_check1545net/ipv4/tcp_input.cif (tcp_check(th, len, saddr, daddr, skb->csum))