fcgs_rsnn_nn_req_s
struct fcgs_rsnn_nn_req_s *rsnn_nn =
(struct fcgs_rsnn_nn_req_s *) (cthdr + 1);
memset(rsnn_nn, 0, sizeof(struct fcgs_rsnn_nn_req_s));
return sizeof(struct fcgs_rsnn_nn_req_s) + sizeof(struct ct_hdr_s);