pf_state_compare_key
static inline int pf_state_compare_key(const struct pf_state_key *,
RBT_GENERATE(pf_state_tree, pf_state_key, sk_entry, pf_state_compare_key);
RBT_PROTOTYPE(pf_state_tree, pf_state_key, sk_entry, pf_state_compare_key);