nf_is_loopback_packet
!nf_is_loopback_packet(skb)) {
seqadj_needed = test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_is_loopback_packet(skb);
if (nf_is_loopback_packet(skb))
if (nf_is_loopback_packet(skb) ||