NF_CT_EXT_ECACHE
return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
return nf_ct_ext_exist(ct, NF_CT_EXT_ECACHE);
e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
[NF_CT_EXT_ECACHE] = sizeof(struct nf_conntrack_ecache),