__udp_manip_pkt 76 net/netfilter/nf_nat_proto.c __udp_manip_pkt(skb, iphdroff, hdr, tuple, maniptype, !!hdr->check); __udp_manip_pkt 93 net/netfilter/nf_nat_proto.c __udp_manip_pkt(skb, iphdroff, hdr, tuple, maniptype, true);