net_ispartialchecksum
extern int net_ispartialchecksum(net_handle_t, struct msgb *);
((net_ispartialchecksum(n, x) & NET_HCK_L3_FULL) == NET_HCK_L3_FULL)
((net_ispartialchecksum(n, x) & NET_HCK_L3_PART) == NET_HCK_L3_PART)
((net_ispartialchecksum(n, x) & NET_HCK_L4_FULL) == NET_HCK_L4_FULL)
((net_ispartialchecksum(n, x) & NET_HCK_L4_PART) == NET_HCK_L4_PART)
((net_ispartialchecksum(n, x) & (NET_HCK_L3_FULL|NET_HCK_L4_FULL)) \