MHLEN
char MH_databuf[MHLEN];
{ (m)->m_data += (MHLEN - (len)) &~ (sizeof (int64_t) - 1); }
((m)->m_flags & M_PKTHDR) ? MHLEN : MLEN)
#define MINCLSIZE (MHLEN + MLEN) /* smallest amount to put in cluster */