to follow KAME mbuf chain requirement, perform m_pullup2 lookalike even if pkthdr.len > MCLBYTES.  otherwise we may have trouble handling jumbograms. (nothing will be done if you define PULLDOWN_TEST)
to follow KAME mbuf chain requirement, perform m_pullup2 lookalike even
if pkthdr.len > MCLBYTES.  otherwise we may have trouble handling jumbograms.
(nothing will be done if you define PULLDOWN_TEST)

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame