FI_DOCKSUM
fin->fin_flx |= FI_DOCKSUM;
fin->fin_flx |= FI_DOCKSUM;
fin->fin_flx |= FI_DOCKSUM;
fin->fin_flx |= FI_DOCKSUM;
fin->fin_flx |= FI_DOCKSUM;
if (fin->fin_flx & FI_DOCKSUM)