npfctl_bpf_tcpfl
npfctl_bpf_tcpfl(ctx, *tf, *tf_mask);
npfctl_bpf_tcpfl(bc, TH_SYN, TH_SYN | TH_ACK | TH_FIN | TH_RST);
void npfctl_bpf_tcpfl(npf_bpf_t *, uint8_t, uint8_t);