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diff --git a/epan/dfilter/dfunctions.h b/epan/dfilter/dfunctions.h
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+/*
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * 
+ * Copyright 2006 Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef DFUNCTIONS_H
+#define DFUNCTIONS_H
+
+#include <glib.h>
+#include <ftypes/ftypes.h>
+#include "syntax-tree.h"
+
+/* The run-time logic of the dfilter function */
+typedef gboolean (*DFFuncType)(GList *arg1list, GList *arg2list, GList **retval);
+
+/* The semantic check for the dfilter function */
+typedef void (*DFSemCheckType)(int param_num, stnode_t *st_node);
+
+/* If a function needs more args than this, increase
+ * this macro and add more arg members to the dfvm_insn_t
+ * struct in dfvm.h, and add some logic to dfw_append_function()
+ * and dfvm_apply() */
+#define DFUNCTION_MAX_NARGS 2
+
+/* This is a "function definition" record, holding everything
+ * we need to know about a function */
+typedef struct {
+    char            *name;
+    DFFuncType      function;
+    ftenum_t        retval_ftype;
+    guint           min_nargs;
+    guint           max_nargs;
+    DFSemCheckType  semcheck_param_function;
+} df_func_def_t;
+
+/* Return the function definition record for a function of named "name" */
+df_func_def_t* df_func_lookup(char *name);
+
+#endif