l4proto_manip_pkt 367 net/netfilter/nf_nat_proto.c if (!l4proto_manip_pkt(skb, iphdroff, hdroff, target, maniptype)) l4proto_manip_pkt 403 net/netfilter/nf_nat_proto.c !l4proto_manip_pkt(skb, iphdroff, hdroff, target, maniptype))