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diff --git a/examples/netmap_compat/netmap/netmap_user.h b/examples/netmap_compat/netmap/netmap_user.h
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+/*
+ * Copyright (C) 2011 Matteo Landi, Luigi Rizzo. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the
+ *      distribution.
+ *
+ *   3. Neither the name of the authors nor the names of their contributors
+ *      may be used to endorse or promote products derived from this
+ *      software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY MATTEO LANDI AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTEO LANDI OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * $FreeBSD: head/sys/net/netmap_user.h 231198 2012-02-08 11:43:29Z luigi $
+ * $Id: netmap_user.h 10879 2012-04-12 22:48:59Z luigi $
+ *
+ * This header contains the macros used to manipulate netmap structures
+ * and packets in userspace. See netmap(4) for more information.
+ *
+ * The address of the struct netmap_if, say nifp, is computed from the
+ * value returned from ioctl(.., NIOCREG, ...) and the mmap region:
+ *	ioctl(fd, NIOCREG, &req);
+ *	mem = mmap(0, ... );
+ *	nifp = NETMAP_IF(mem, req.nr_nifp);
+ *		(so simple, we could just do it manually)
+ *
+ * From there:
+ *	struct netmap_ring *NETMAP_TXRING(nifp, index)
+ *	struct netmap_ring *NETMAP_RXRING(nifp, index)
+ *		we can access ring->nr_cur, ring->nr_avail, ring->nr_flags
+ *
+ *	ring->slot[i] gives us the i-th slot (we can access
+ *		directly plen, flags, bufindex)
+ *
+ *	char *buf = NETMAP_BUF(ring, index) returns a pointer to
+ *		the i-th buffer
+ *
+ * Since rings are circular, we have macros to compute the next index
+ *	i = NETMAP_RING_NEXT(ring, i);
+ */
+
+#ifndef _NET_NETMAP_USER_H_
+#define _NET_NETMAP_USER_H_
+
+#define NETMAP_IF(b, o)	(struct netmap_if *)((char *)(b) + (o))
+
+#define NETMAP_TXRING(nifp, index)			\
+	((struct netmap_ring *)((char *)(nifp) +	\
+		(nifp)->ring_ofs[index] ) )
+
+#define NETMAP_RXRING(nifp, index)			\
+	((struct netmap_ring *)((char *)(nifp) +	\
+	    (nifp)->ring_ofs[index + (nifp)->ni_tx_rings + 1] ) )
+
+#define NETMAP_BUF(ring, index)				\
+	((char *)(ring) + (ring)->buf_ofs + ((index)*(ring)->nr_buf_size))
+
+#define NETMAP_BUF_IDX(ring, buf)			\
+	( ((char *)(buf) - ((char *)(ring) + (ring)->buf_ofs) ) / \
+		(ring)->nr_buf_size )
+
+#define	NETMAP_RING_NEXT(r, i)				\
+	((i)+1 == (r)->num_slots ? 0 : (i) + 1 )
+
+#define	NETMAP_RING_FIRST_RESERVED(r)			\
+	( (r)->cur < (r)->reserved ?			\
+	  (r)->cur + (r)->num_slots - (r)->reserved :	\
+	  (r)->cur - (r)->reserved )
+
+/*
+ * Return 1 if the given tx ring is empty.
+ */
+#define NETMAP_TX_RING_EMPTY(r)	((r)->avail >= (r)->num_slots - 1)
+
+#endif /* _NET_NETMAP_USER_H_ */