taglinefilesource code
tcp_check1086net/ipv4/tcp.cth->check = tcp_check(th, len, saddr, daddr,
tcp_check4522net/ipv4/tcp.c(skb->ip_summed && tcp_check(th, len, saddr, daddr, skb->csum ))||
tcp_check4523net/ipv4/tcp.c(!skb->ip_summed && tcp_check(th, len, saddr, daddr, csum_partial((char *)th, len, 0)))