tcp_valid_flags 700 net/netfilter/nf_conntrack_proto_tcp.c static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK| tcp_valid_flags 750 net/netfilter/nf_conntrack_proto_tcp.c if (!tcp_valid_flags[tcpflags]) {