ip_fw3_state_cmp
RB_GENERATE(fw3_state_tree, ipfw3_state, entries, ip_fw3_state_cmp);
int ip_fw3_state_cmp(struct ipfw3_state *s1, struct ipfw3_state *s2);
RB_PROTOTYPE(fw3_state_tree, ipfw3_state, entries, ip_fw3_state_cmp);