Folks, does the following patch make sense:

server@[/u/vijay/bsd/CODE/cur/sys/sys]# svn diff mbuf.h
Index: mbuf.h
===================================================================
--- mbuf.h      (revision 240548)
+++ mbuf.h      (working copy)
@@ -832,6 +832,8 @@
        ((m)->m_flags & M_EXT ?                                         \
            (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size   \
                - ((m)->m_data + (m)->m_len) : 0) :                     \
+           (m)->m_flags & M_PKTHDR ?                                   \
+           ((m)->m_pktdat[MHLEN] - ((m)->m_data + (m)->m_len)) :       \
            &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))

 /*
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