pf_kanchor_compare
RB_PROTOTYPE(pf_kanchor_node, pf_kanchor, entry_node, pf_kanchor_compare);
static __inline int pf_kanchor_compare(struct pf_kanchor *,
RB_GENERATE(pf_kanchor_global, pf_kanchor, entry_global, pf_kanchor_compare);
RB_GENERATE(pf_kanchor_node, pf_kanchor, entry_node, pf_kanchor_compare);