From c5c63975d538cf48ceb99ba48c341293676d15c0 Mon Sep 17 00:00:00 2001
From: julian <julian@FreeBSD.org>
Date: Thu, 21 Oct 1999 09:06:11 +0000
Subject: Whistle's Netgraph link-layer (sometimes more) networking
 infrastructure. Been in production for 3 years now. Gives Instant Frame relay
 to if_sr and if_ar drivers, and PPPOE support soon. See:
 ftp://ftp.whistle.com/pub/archie/netgraph/index.html for on-line manual
 pages.

Reviewed by: Doug Rabson (dfr@freebsd.org)
Obtained from:  Whistle CVS tree
---
 sys/netgraph/ng_echo.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 sys/netgraph/ng_echo.c

(limited to 'sys/netgraph/ng_echo.c')

diff --git a/sys/netgraph/ng_echo.c b/sys/netgraph/ng_echo.c
new file mode 100644
index 0000000..ed69f9c
--- /dev/null
+++ b/sys/netgraph/ng_echo.c
@@ -0,0 +1,121 @@
+
+/*
+ * ng_echo.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 Elisher <julian@whistle.com>
+ *
+ * $FreeBSD$
+ * $Whistle: ng_echo.c,v 1.11 1999/01/28 23:54:53 julian Exp $
+ */
+
+/*
+ * Netgraph "echo" node
+ *
+ * This node simply bounces data and messages back to whence they came.
+ */
+
+#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/syslog.h>
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.h>
+#include <netgraph/ng_echo.h>
+
+/* Netgraph methods */
+static int	nge_rcvmsg(node_p node, struct ng_mesg *msg,
+		    const char *retaddr, struct ng_mesg ** resp);
+static int	nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta);
+static int	nge_disconnect(hook_p hook);
+
+/* Netgraph type */
+static struct ng_type typestruct = {
+	NG_VERSION,
+	NG_ECHO_NODE_TYPE,
+	NULL,
+	NULL,
+	nge_rcvmsg,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	nge_rcvdata,
+	nge_rcvdata,
+	nge_disconnect
+};
+NETGRAPH_INIT(echo, &typestruct);
+
+/*
+ * Receive control message. We just bounce it back as a reply.
+ */
+static int
+nge_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
+	   struct ng_mesg **rptr)
+{
+	if (rptr) {
+		msg->header.flags |= NGF_RESP;
+		*rptr = msg;
+	} else {
+		FREE(msg, M_NETGRAPH);
+	}
+	return (0);
+}
+
+/*
+ * Receive data
+ */
+static int
+nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
+{
+	int error = 0;
+
+	NG_SEND_DATA(error, hook, m, meta);
+	return (error);
+}
+
+/*
+ * Removal of the last link destroys the nodeo
+ */
+static int
+nge_disconnect(hook_p hook)
+{
+	if (hook->node->numhooks == 0)
+		ng_rmnode(hook->node);
+	return (0);
+}
+
-- 
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