V_pf_frnode_tree
RB_REMOVE(pf_frnode_tree, &V_pf_frnode_tree, frnode);
frnode = RB_FIND(pf_frnode_tree, &V_pf_frnode_tree, key);
frnode = RB_FIND(pf_frnode_tree, &V_pf_frnode_tree, key);
RB_INSERT(pf_frnode_tree, &V_pf_frnode_tree, frnode);