1 files changed, 99 insertions, 0 deletions
diff --git a/test/packetdrill/netdev.h b/test/packetdrill/netdev.h
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+++ b/test/packetdrill/netdev.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Interface for a "virtual network device" module to inject packets
+ * into the kernel and sniff packets leaving the kernel.
+ */
+
+#ifndef __PACKET_NETDEV_H__
+#define __PACKET_NETDEV_H__
+
+#include "types.h"
+
+#include "config.h"
+#include "packet.h"
+#include "packet_parser.h"
+#include "packet_socket.h"
+
+struct netdev_ops;
+
+/* A C-style poor-man's "pure virtual" netdev. */
+struct netdev {
+	struct netdev_ops *ops;	/* C-style vtable pointer */
+};
+
+struct netdev_ops {
+	/* Tear down a netdev and free up the resources it has allocated. */
+	void (*free)(struct netdev *netdev);
+
+	/* Inject a raw TCP/IP packet into the kernel. */
+	int (*send)(struct netdev *netdev,
+		    struct packet *packet);
+
+	/* Sniff the next TCP/IP packet leaving the kernel and return a
+	 * pointer to the newly-allocated packet. Caller must free the packet
+	 * with packet_free().
+	 */
+	int (*receive)(struct netdev *netdev,
+		       struct packet **packet, char **error);
+};
+
+
+/* Tear down a netdev and free up the resources it has allocated. */
+static inline void netdev_free(struct netdev *netdev)
+{
+	netdev->ops->free(netdev);
+}
+
+/* Inject a raw TCP/IP packet into the kernel. */
+static inline int netdev_send(struct netdev *netdev,
+			      struct packet *packet)
+{
+	return netdev->ops->send(netdev, packet);
+}
+
+/* Sniff the next TCP/IP packet leaving the kernel and return a
+ * pointer to the newly-allocated packet. Caller must free the packet
+ * with packet_free().
+ */
+static inline int netdev_receive(struct netdev *netdev,
+				 struct packet **packet,
+				 char **error)
+{
+	return netdev->ops->receive(netdev, packet, error);
+}
+
+
+/* Keep sniffing packets leaving the kernel until we see one we know
+ * about and can parse. Return a pointer to the newly-allocated
+ * packet. Caller must free the packet with packet_free().
+ */
+extern int netdev_receive_loop(struct packet_socket *psock,
+			       enum packet_layer_t layer,
+			       enum direction_t direction,
+			       struct packet **packet,
+			       int *num_packets,
+			       char **error);
+
+/* Allocate and return a new netdev for purely local tests. */
+extern struct netdev *local_netdev_new(struct config *config);
+
+#endif /* __PACKET_NETDEV_H__ */