(ifp)->if_mtu : ((ND_IFINFO(ifp)->linkmtu && \
ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) ? ND_IFINFO(ifp)->linkmtu : \
((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) ? \
(ifp)->if_mtu : ((ND_IFINFO(ifp)->linkmtu && \
ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) ? ND_IFINFO(ifp)->linkmtu : \
((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) ? \