helper_extend 552 net/netfilter/nf_conntrack_helper.c static const struct nf_ct_ext_type helper_extend = { helper_extend 573 net/netfilter/nf_conntrack_helper.c ret = nf_ct_extend_register(&helper_extend); helper_extend 588 net/netfilter/nf_conntrack_helper.c nf_ct_extend_unregister(&helper_extend);