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diff --git a/sys/netgraph/ng_UI.c b/sys/netgraph/ng_UI.c
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+
+/*
+ * ng_UI.c
+ *
+ * Copyright (c) 1996-1999 Whistle Communications, Inc.
+ * All rights reserved.
+ *
+ * Subject to the following obligations and disclaimer of warranty, use and
+ * redistribution of this software, in source or object code forms, with or
+ * without modifications are expressly permitted by Whistle Communications;
+ * provided, however, that:
+ * 1. Any and all reproductions of the source or object code must include the
+ * copyright notice above and the following disclaimer of warranties; and
+ * 2. No rights are granted, in any manner or form, to use Whistle
+ * Communications, Inc. trademarks, including the mark "WHISTLE
+ * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
+ * such appears in the above copyright notice or in the software.
+ *
+ * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
+ * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
+ * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+ * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+ * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+ * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+ * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+ * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
+ * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+ * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Julian Elischer <julian@whistle.com>
+ *
+ * $FreeBSD$
+ * $Whistle: ng_UI.c,v 1.11 1999/01/28 23:54:52 julian Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/conf.h>
+#include <sys/errno.h>
+#include <sys/socket.h>
+#include <sys/syslog.h>
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.h>
+#include <netgraph/ng_UI.h>
+
+/*
+ * DEFINITIONS
+ */
+
+/* Everything, starting with sdlc on has defined UI as 0x03 */
+#define HDLC_UI 0x03
+
+/* Node private data */
+struct private {
+ hook_p downlink;
+ hook_p uplink;
+};
+typedef struct private *priv_p;
+
+/* Netgraph node methods */
+static int ng_UI_constructor(node_p *nodep);
+static int ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
+ const char *retaddr, struct ng_mesg **resp);
+static int ng_UI_rmnode(node_p node);
+static int ng_UI_newhook(node_p node, hook_p hook, const char *name);
+static int ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta);
+static int ng_UI_disconnect(hook_p hook);
+
+/* Node type descriptor */
+static struct ng_type typestruct = {
+ NG_VERSION,
+ NG_UI_NODE_TYPE,
+ NULL,
+ ng_UI_constructor,
+ ng_UI_rcvmsg,
+ ng_UI_rmnode,
+ ng_UI_newhook,
+ NULL,
+ NULL,
+ ng_UI_rcvdata,
+ ng_UI_rcvdata,
+ ng_UI_disconnect
+};
+NETGRAPH_INIT(UI, &typestruct);
+
+/************************************************************************
+ NETGRAPH NODE STUFF
+ ************************************************************************/
+
+/*
+ * Create a newborn node. We start with an implicit reference.
+ */
+
+static int
+ng_UI_constructor(node_p *nodep)
+{
+ priv_p priv;
+ int error;
+
+ /* Allocate private structure */
+ MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
+ if (priv == NULL)
+ return (ENOMEM);
+ bzero(priv, sizeof(*priv));
+
+ /* Call generic node constructor */
+ if ((error = ng_make_node_common(&typestruct, nodep))) {
+ FREE(priv, M_NETGRAPH);
+ return (error);
+ }
+ (*nodep)->private = priv;
+
+ /* Done */
+ return (0);
+}
+
+/*
+ * Give our ok for a hook to be added
+ */
+static int
+ng_UI_newhook(node_p node, hook_p hook, const char *name)
+{
+ const priv_p priv = node->private;
+
+ if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
+ if (priv->downlink)
+ return (EISCONN);
+ priv->downlink = hook;
+ } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
+ if (priv->uplink)
+ return (EISCONN);
+ priv->uplink = hook;
+ } else
+ return (EINVAL);
+ return (0);
+}
+
+/*
+ * Receive a control message
+ */
+static int
+ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
+ const char *raddr, struct ng_mesg **rp)
+{
+ FREE(msg, M_NETGRAPH);
+ return (EINVAL);
+}
+
+#define MAX_ENCAPS_HDR 1
+#define ERROUT(x) do { error = (x); goto done; } while (0)
+
+/*
+ * Receive a data frame
+ */
+static int
+ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
+{
+ const node_p node = hook->node;
+ const priv_p priv = node->private;
+ int error = 0;
+
+ if (hook == priv->downlink) {
+ u_char *start, *ptr;
+
+ if (!m || !(m = m_pullup(m, MAX_ENCAPS_HDR)))
+ ERROUT(ENOBUFS);
+ ptr = start = mtod(m, u_char *);
+
+ /* Must be UI frame */
+ if (*ptr++ != HDLC_UI)
+ ERROUT(0);
+
+ m_adj(m, ptr - start);
+ NG_SEND_DATA(error, priv->uplink, m, meta); /* m -> NULL */
+ } else if (hook == priv->uplink) {
+ M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */
+ if (!m)
+ ERROUT(ENOBUFS);
+ mtod(m, u_char *)[0] = HDLC_UI;
+ NG_SEND_DATA(error, priv->downlink, m, meta); /* m -> NULL */
+ } else
+ panic(__FUNCTION__);
+
+done:
+ NG_FREE_DATA(m, meta); /* does nothing if m == NULL */
+ return (error);
+}
+
+/*
+ * Shutdown node
+ */
+static int
+ng_UI_rmnode(node_p node)
+{
+ const priv_p priv = node->private;
+
+ /* Take down netgraph node */
+ node->flags |= NG_INVALID;
+ ng_cutlinks(node);
+ ng_unname(node);
+ bzero(priv, sizeof(*priv));
+ FREE(priv, M_NETGRAPH);
+ node->private = NULL;
+ ng_unref(node);
+ return (0);
+}
+
+/*
+ * Hook disconnection
+ */
+static int
+ng_UI_disconnect(hook_p hook)
+{
+ const priv_p priv = hook->node->private;
+
+ if (hook->node->numhooks == 0)
+ ng_rmnode(hook->node);
+ else if (hook == priv->downlink)
+ priv->downlink = NULL;
+ else if (hook == priv->uplink)
+ priv->uplink = NULL;
+ else
+ panic(__FUNCTION__);
+ return (0);
+}
+
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