TCP_CSUM_OFF       40 samples/bpf/tcbpf1_kern.c 	bpf_l4_csum_replace(skb, TCP_CSUM_OFF, old_ip, new_ip, IS_PSEUDO | sizeof(new_ip));
TCP_CSUM_OFF       50 samples/bpf/tcbpf1_kern.c 	bpf_l4_csum_replace(skb, TCP_CSUM_OFF, old_port, new_port, sizeof(new_port));
TCP_CSUM_OFF      106 samples/bpf/test_lwt_bpf.c 		off = TCP_CSUM_OFF;