2 files changed, 272 insertions, 0 deletions

diff --git a/sys/netgraph/ng_split.c b/sys/netgraph/ng_split.c
new file mode 100644
index 000000000000..d42ee9806df9
--- /dev/null
+++ b/sys/netgraph/ng_split.c
@@ -0,0 +1,227 @@
+/*-
+ *
+ * Copyright (c) 1999-2000, Vitaly V Belekhov
+ * 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 unmodified, 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
+ *
+ * 	$FreeBSD$
+ *
+ */
+
+#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/errno.h>
+#include <sys/sockio.h>
+#include <sys/socket.h>
+#include <sys/syslog.h>
+
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.h>
+#include <netgraph/ng_split.h>
+
+/* Netgraph methods */
+static ng_constructor_t ng_split_constructor;
+static ng_rcvmsg_t ng_split_rcvmsg;
+static ng_shutdown_t ng_split_rmnode;
+static ng_newhook_t ng_split_newhook;
+static ng_rcvdata_t ng_split_rcvdata;
+static ng_connect_t ng_split_connect;
+static ng_disconnect_t ng_split_disconnect;
+
+/* Node type descriptor */
+static struct ng_type typestruct = {
+	NG_ABI_VERSION,
+	NG_SPLIT_NODE_TYPE,
+	NULL,
+	ng_split_constructor,
+	ng_split_rcvmsg,
+	ng_split_rmnode,
+	ng_split_newhook,
+	NULL,
+	ng_split_connect,
+	ng_split_rcvdata,
+	ng_split_disconnect,
+	NULL
+};
+NETGRAPH_INIT(ng_split, &typestruct);
+
+/* Node private data */
+struct ng_split_private {
+        hook_p outhook;
+        hook_p inhook;
+        hook_p mixed;
+	node_p	node;			/* Our netgraph node */
+};
+typedef struct ng_split_private *priv_p;
+
+/************************************************************************
+			NETGRAPH NODE STUFF
+ ************************************************************************/
+
+/*
+ * Constructor for a node
+ */
+static int
+ng_split_constructor(node_p node)
+{
+	priv_p          priv;
+
+	/* Allocate node */
+	MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT);
+	if (priv == NULL)
+		return (ENOMEM);
+	bzero(priv, sizeof(*priv));
+
+	/* Link together node and private info */
+	NG_NODE_SET_PRIVATE(node, priv);
+	priv->node = node;
+
+	/* Done */
+	return (0);
+}
+
+/*
+ * Give our ok for a hook to be added
+ */
+static int
+ng_split_newhook(node_p node, hook_p hook, const char *name)
+{
+	priv_p          priv = NG_NODE_PRIVATE(node);
+
+	if (strcmp(name, NG_SPLIT_HOOK_MIXED)) {
+		if (strcmp(name, NG_SPLIT_HOOK_INHOOK)) {
+			if (strcmp(name, NG_SPLIT_HOOK_OUTHOOK))
+				return (EPFNOSUPPORT);
+			else {
+				if (priv->outhook != NULL)
+					return (EISCONN);
+				priv->outhook = hook;
+				NG_HOOK_SET_PRIVATE(hook, &(priv->outhook));
+			}
+		} else {
+			if (priv->inhook != NULL)
+				return (EISCONN);
+			priv->inhook = hook;
+			NG_HOOK_SET_PRIVATE(hook, &(priv->inhook));
+		}
+	} else {
+		if (priv->mixed != NULL)
+			return (EISCONN);
+		priv->mixed = hook;
+		NG_HOOK_SET_PRIVATE(hook, &(priv->mixed));
+	}
+
+	return (0);
+}
+
+/*
+ * Receive a control message
+ */
+static int
+ng_split_rcvmsg(node_p node, item_p item, hook_p lasthook)
+{
+	NG_FREE_ITEM(item);
+	return (EINVAL);
+}
+
+/*
+ * Recive data from a hook.
+ */
+static int
+ng_split_rcvdata(hook_p hook, item_p item)
+{
+	meta_p          meta;
+	const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
+	int             error = 0;
+
+	if (hook == priv->outhook) {
+		printf("ng_split: got packet from outhook!\n");
+		NG_FREE_ITEM(item);
+		return (EINVAL);
+	}
+#if 0 /* should never happen */
+	if (NGI_M(item) == NULL) {
+		printf("ng_split: mbuf is null.\n");
+		NG_FREE_ITEM(item);
+		return (EINVAL);
+	}
+#endif
+	/* 
+	 * XXX Really here we should just remove metadata we understand.
+	 */
+	NGI_GET_META(item, meta);
+	NG_FREE_META(meta);
+	if ((hook == priv->inhook) && (priv->mixed)) {
+		NG_FWD_ITEM_HOOK(error, item, priv->mixed);
+	} else if ((hook == priv->mixed) && (priv->outhook)) {
+		NG_FWD_ITEM_HOOK(error, item, priv->outhook);
+	}
+	return (error);
+}
+
+static int
+ng_split_rmnode(node_p node)
+{
+	const priv_p priv = NG_NODE_PRIVATE(node);
+
+	NG_NODE_SET_PRIVATE(node, NULL);
+	NG_NODE_UNREF(node);
+	FREE(priv, M_NETGRAPH);
+
+	return (0);
+}
+
+
+/*
+ * This is called once we've already connected a new hook to the other node.
+ * It gives us a chance to balk at the last minute.
+ */
+static int
+ng_split_connect(hook_p hook)
+{
+	/* be really amiable and just say "YUP that's OK by me! " */
+	return (0);
+}
+
+/*
+ * Hook disconnection
+ */
+static int
+ng_split_disconnect(hook_p hook)
+{
+	if (NG_HOOK_PRIVATE(hook)) {
+		*((hook_p *)NG_HOOK_PRIVATE(hook)) = (hook_p)0;
+	}
+
+	if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
+	&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
+			ng_rmnode_self(NG_HOOK_NODE(hook));
+	}
+
+	return (0);
+}
diff --git a/sys/netgraph/ng_split.h b/sys/netgraph/ng_split.h
new file mode 100644
index 000000000000..a8b66d5c6d53
--- /dev/null
+++ b/sys/netgraph/ng_split.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright (c) 1999-2000, Vitaly V Belekhov
+ * 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 unmodified, 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
+ *
+ * 	$FreeBSD$
+ *
+ */
+
+
+#ifndef _NG_SPLIT_H
+#define _NG_SPLIT_H
+
+/* Node type name and magic cookie */
+#define NG_SPLIT_NODE_TYPE		"ng_split"
+#define NGM_NG_SPLIT_COOKIE		949409402
+
+/* My hook names */
+#define NG_SPLIT_HOOK_MIXED       	"mixed"		/* Mixed stream (in/out) */
+#define NG_SPLIT_HOOK_OUTHOOK     	"out"		/* Output to outhook (sending out) */
+#define NG_SPLIT_HOOK_INHOOK	     	"in"		/* Input from inhook (recieving) */
+
+#endif /* _NG_SPLIT_H */