V_pf_statelim_id_tree_active
RB_INIT(&V_pf_statelim_id_tree_active);
&V_pf_statelim_id_tree_active, &key));
&V_pf_statelim_id_tree_active, pfstlim);
RB_REMOVE(pf_statelim_id_tree, &V_pf_statelim_id_tree_active,
pfstlim = (*rbt_op)(&V_pf_statelim_id_tree_active, &key);