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);