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diff --git a/test/packetdrill/packet_parser.h b/test/packetdrill/packet_parser.h
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+/*
+ * 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 module to parse TCP/IP packets.
+ */
+
+#ifndef __PACKET_PARSER_H__
+#define __PACKET_PARSER_H__
+
+#include "packet.h"
+
+/* What layer of headers is at the head of the packet? */
+enum packet_layer_t {
+	PACKET_LAYER_3_IP = 0,		/* no layer 2 headers */
+	PACKET_LAYER_2_ETHERNET,	/* layer 2 is Ethernet */
+};
+
+enum packet_parse_result_t {
+	PACKET_OK,		/* no errors detected */
+	PACKET_BAD,		/* illegal header */
+	PACKET_UNKNOWN_L4,	/* not TCP or UDP */
+};
+
+/* Given an input packet of length 'in_bytes' stored in the buffer
+ * whose location is given by the packet's 'buffer' field and whose
+ * full size is given by the 'buffer_bytes' field, parses the packets
+ * and fills in packet fields 'ip_bytes', 'ip', and 'tcp'. On success,
+ * returns PACKET_OK; on error, returns a enum packet_parse_result_t error
+ * code and fills in *error with a human-readable, malloc-allocated
+ * error message.
+ */
+int parse_packet(struct packet *packet, int in_bytes,
+		 enum packet_layer_t layer, char **error);
+
+#endif /* __PACKET_PARSER_H__ */