ipfw_obj_dyntlv
ipfw_obj_dyntlv *dst, *last;
ctlv->objsize = sizeof(ipfw_obj_dyntlv);
dst = (ipfw_obj_dyntlv *)ipfw_get_sopt_space(sd, \
sizeof(ipfw_obj_dyntlv)); \
dst->head.length = sizeof(ipfw_obj_dyntlv); \
ipfw_dyn_get_count(bmask, &i) * sizeof(ipfw_obj_dyntlv);