MPLS_LS_LABEL_MASK
mpls_mask |= MPLS_LS_LABEL_MASK;
#define MPLS_LABEL_MASK (MPLS_LS_LABEL_MASK >> MPLS_LS_LABEL_SHIFT)
label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
new_lse &= ~MPLS_LS_LABEL_MASK;