TCP_DPORT_OFF 48 samples/bpf/tcbpf1_kern.c __u16 old_port = htons(load_half(skb, TCP_DPORT_OFF)); TCP_DPORT_OFF 51 samples/bpf/tcbpf1_kern.c bpf_skb_store_bytes(skb, TCP_DPORT_OFF, &new_port, sizeof(new_port), 0);