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diff --git a/src/openvpn/mbuf.h b/src/openvpn/mbuf.h
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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef MBUF_H
+#define MBUF_H
+
+/*
+ * Handle both multicast and broadcast functions.
+ */
+
+#if P2MP
+
+/* define this to enable special test mode */
+/*#define MBUF_TEST*/
+
+#include "basic.h"
+#include "buffer.h"
+
+struct multi_instance;
+
+#define MBUF_INDEX(head, offset, size) (((head) + (offset)) & ((size)-1))
+
+struct mbuf_buffer
+{
+ struct buffer buf;
+ int refcount;
+
+# define MF_UNICAST (1<<0)
+ unsigned int flags;
+};
+
+struct mbuf_item
+{
+ struct mbuf_buffer *buffer;
+ struct multi_instance *instance;
+};
+
+struct mbuf_set
+{
+ unsigned int head;
+ unsigned int len;
+ unsigned int capacity;
+ unsigned int max_queued;
+ struct mbuf_item *array;
+};
+
+struct mbuf_set *mbuf_init (unsigned int size);
+void mbuf_free (struct mbuf_set *ms);
+
+struct mbuf_buffer *mbuf_alloc_buf (const struct buffer *buf);
+void mbuf_free_buf (struct mbuf_buffer *mb);
+
+void mbuf_add_item (struct mbuf_set *ms, const struct mbuf_item *item);
+
+bool mbuf_extract_item (struct mbuf_set *ms, struct mbuf_item *item);
+
+void mbuf_dereference_instance (struct mbuf_set *ms, struct multi_instance *mi);
+
+static inline bool
+mbuf_defined (const struct mbuf_set *ms)
+{
+ return ms && ms->len;
+}
+
+static inline bool
+mbuf_len (const struct mbuf_set *ms)
+{
+ return ms->len;
+}
+
+static inline int
+mbuf_maximum_queued (const struct mbuf_set *ms)
+{
+ return (int) ms->max_queued;
+}
+
+static inline struct multi_instance *
+mbuf_peek (struct mbuf_set *ms)
+{
+ struct multi_instance *mbuf_peek_dowork (struct mbuf_set *ms);
+ if (mbuf_defined (ms))
+ return mbuf_peek_dowork (ms);
+ else
+ return NULL;
+}
+
+#endif
+#endif