Index: sys/mbuf.h
===================================================================
RCS file: /cvs/src/sys/sys/mbuf.h,v
retrieving revision 1.210
diff -u -p -r1.210 mbuf.h
--- sys/mbuf.h	4 Apr 2016 12:14:07 -0000	1.210
+++ sys/mbuf.h	6 Apr 2016 10:19:49 -0000
@@ -439,7 +438,8 @@ void	m_extref(struct mbuf *, struct mbuf
 void	m_extfree_pool(caddr_t, u_int, void *);
 void	m_adj(struct mbuf *, int);
 int	m_copyback(struct mbuf *, int, int, const void *, int);
-void	m_freem(struct mbuf *);
+struct mbuf *m_freem(struct mbuf *);
+void	m_purge(struct mbuf *);
 void	m_reclaim(void *, int);
 void	m_copydata(struct mbuf *, int, int, caddr_t);
 void	m_cat(struct mbuf *, struct mbuf *);
Index: kern/uipc_mbuf.c
===================================================================
RCS file: /cvs/src/sys/kern/uipc_mbuf.c,v
retrieving revision 1.222
diff -u -p -r1.222 uipc_mbuf.c
--- kern/uipc_mbuf.c	6 Apr 2016 01:36:06 -0000	1.222
+++ kern/uipc_mbuf.c	6 Apr 2016 10:19:49 -0000
@@ -425,11 +425,28 @@ m_extfree(struct mbuf *m)
 	m->m_flags &= ~(M_EXT|M_EXTWR);
 }
 
-void
+struct mbuf *
 m_freem(struct mbuf *m)
 {
-	while (m != NULL)
+	struct mbuf *n;
+
+	if (m == NULL)
+		return (NULL);
+
+	n = m->m_nextpkt;
+
+	do
 		m = m_free(m);
+	while (m != NULL);
+
+	return (n);
+}
+
+void
+m_purge(struct mbuf *m)
+{
+	while (m != NULL)
+		m = m_freem(m);
 }
 
 /*