ire_ftable_lookup_simple_v4
ire = ire_ftable_lookup_simple_v4(addr, 0, ipst, NULL);
ire = ire_ftable_lookup_simple_v4(nexthop, xmit_hint, ipst,
extern ire_t *ire_ftable_lookup_simple_v4(ipaddr_t, uint32_t, ip_stack_t *,