NET_HCK_L4_FULL
ret |= (int)NET_HCK_L4_FULL;
((net_ispartialchecksum(n, x) & NET_HCK_L4_FULL) == NET_HCK_L4_FULL)
((net_ispartialchecksum(n, x) & (NET_HCK_L3_FULL|NET_HCK_L4_FULL)) \
== (NET_HCK_L3_FULL | NET_HCK_L4_FULL))