taglinefilesource code
fib_mtu105net/ipv4/route.cunsigned short    fib_mtu;
fib_mtu484net/ipv4/route.cfi->fib_mtu != mss ||
fib_mtu501net/ipv4/route.cfi->fib_mtu = mss;
fib_mtu872net/ipv4/route.c(unsigned long)fz->fz_mask, (int)fi->fib_mtu, fi->fib_window, (int)fi->fib_irtt);
fib_mtu1549net/ipv4/route.crth->rt_mtu  = fi->fib_mtu;