host_node_s
static int ipf_ht_node_cmp(struct host_node_s *, struct host_node_s *);
ipf_ht_node_cmp(struct host_node_s *k1, struct host_node_s *k2)
RBI_LINK(ipf_rb, host_node_s);
typedef RBI_HEAD(ipf_rb, host_node_s) ipf_rb_head_t;