Add the netgraph 'source' module.

This is NOT YET CONVERTED TO -current.
This node is a source for preprogrammed packets at a known rate for testing.

I will convert it to -current "in place" but will MFC teh original
pre-conversion variant as that is  what is originally submitted.
Man page my me, info from Dave's README.

Submitted by:	Dave Chapeskie <dchapeskie@SANDVINE.com>
Obtained from:	Sandvine inc.
MFC after:	1 week

1 files changed, 94 insertions, 0 deletions

diff --git a/sys/netgraph/ng_source.h b/sys/netgraph/ng_source.h
new file mode 100644
index 0000000..271c15c
--- /dev/null
+++ b/sys/netgraph/ng_source.h
@@ -0,0 +1,94 @@
+/*
+ * ng_source.h
+ *
+ * Copyright 2002 Sandvine 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 Sandvine Inc.;
+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 Sandvine Inc.
+ *    trademarks, including the mark "SANDVINE" on advertising,
+endorsements,
+ *    or otherwise except as such appears in the above copyright notice or
+in
+ *    the software.
+ *
+ * THIS SOFTWARE IS BEING PROVIDED BY SANDVINE "AS IS", AND TO THE MAXIMUM
+ * EXTENT PERMITTED BY LAW, SANDVINE 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.  SANDVINE 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 SANDVINE 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 SANDVINE IS ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Author: Dave Chapeskie <dchapeskie@sandvine.com>
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _NETGRAPH_SOURCE_H_
+#define _NETGRAPH_SOURCE_H_
+
+/* Node type name and magic cookie */
+#define NG_SOURCE_NODE_TYPE	"source"
+#define NGM_SOURCE_COOKIE	1034346805
+
+/* Hook names */
+#define NG_SOURCE_HOOK_INPUT	"input"
+#define NG_SOURCE_HOOK_OUTPUT	"output"
+
+/* Statistics structure returned by NGM_SOURCE_GET_STATS */
+struct ng_source_stats {
+	u_int64_t	outOctets;
+	u_int64_t	outFrames;
+	u_int32_t	queueOctets;
+	u_int32_t	queueFrames;
+	struct timeval	startTime;
+	struct timeval	endTime;
+	struct timeval	elapsedTime;
+};
+
+extern const struct ng_parse_type ng_source_timeval_type;
+/* Keep this in sync with the above structure definition */
+#define NG_SOURCE_STATS_TYPE_INFO	{			\
+	  { "outOctets",	&ng_parse_uint64_type	},	\
+	  { "outFrames",	&ng_parse_uint64_type	},	\
+	  { "queueOctets",	&ng_parse_uint32_type	},	\
+	  { "queueFrames",	&ng_parse_uint32_type	},	\
+	  { "startTime",	&ng_source_timeval_type },	\
+	  { "endTime",		&ng_source_timeval_type },	\
+	  { "elapsedTime",	&ng_source_timeval_type },	\
+	  { NULL }						\
+}
+
+/* Netgraph commands */
+enum {
+	NGM_SOURCE_GET_STATS = 1,	/* get stats */
+	NGM_SOURCE_CLR_STATS,		/* clear stats */
+	NGM_SOURCE_GETCLR_STATS,	/* atomically get and clear stats */
+	NGM_SOURCE_START,		/* start sending queued data */
+	NGM_SOURCE_STOP,		/* stop sending queued data */
+	NGM_SOURCE_CLR_DATA,		/* clear the queued data */
+};
+
+#endif /* _NETGRAPH_SOURCE_H_ */