old_tos            25 samples/bpf/tcbpf1_kern.c 	__u8 old_tos = load_byte(skb, TOS_OFF);
old_tos            27 samples/bpf/tcbpf1_kern.c 	bpf_l3_csum_replace(skb, IP_CSUM_OFF, htons(old_tos), htons(new_tos), 2);