ipif_select_source_v4
ipif = ipif_select_source_v4(ill, dst, zoneid, B_TRUE, ¬ready);
ipif = ipif_select_source_v4(ill, nce_addr, ALL_ZONES,
ipif = ipif_select_source_v4(send_ill,
extern ipif_t *ipif_select_source_v4(ill_t *, ipaddr_t, zoneid_t, boolean_t,