VXLAN_VNI_SHIFT
vni = htonl(ifr->ifr_vnetid << VXLAN_VNI_SHIFT);
vni >>= VXLAN_VNI_SHIFT;
sc->sc_header.vxlan_id = htonl(0 << VXLAN_VNI_SHIFT);
#define VXLAN_VNI_MASK (0xffffffU << VXLAN_VNI_SHIFT)
#define VXLAN_VNI_MASK (0xffffffU << VXLAN_VNI_SHIFT)
VXLAN_VNI_SHIFT;