* Define *DLC frame types, and routine to dissect the control field of
* a *DLC frame.
*
- * $Id: xdlc.h,v 1.2 1999/08/23 22:47:13 guy Exp $
+ * $Id: xdlc.h,v 1.17 2002/08/28 21:00:41 jmayer Exp $
*
* Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@unicom.net>
+ * By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
- *
+ *
* 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 __XDLC_H__
+#define __XDLC_H__
+
/*
* Low-order bits of first (extended) or only (basic) octet of control
* field, specifying the frame type.
#define XDLC_RD 0x40 /* Request Disconnect (response) */
#define XDLC_UA 0x60 /* Unnumbered Acknowledge */
#define XDLC_SNRM 0x80 /* Set Normal Response Mode */
-#define XDLC_TEST 0xC0 /* Test */
+#define XDLC_TEST 0xE0 /* Test */
#define XDLC_SIM 0x04 /* Set Initialization Mode (command) */
#define XDLC_RIM 0x04 /* Request Initialization Mode (response) */
#define XDLC_FRMR 0x84 /* Frame reject */
#define XDLC_SNRME 0xCC /* Set Normal Response Mode Extended */
#define XDLC_BCN 0xEC /* Beacon */
-int get_xdlc_control(const u_char *pd, int offset, int is_response,
+/*
+ * This macro takes the control field of an xDLC frame, as returned by
+ * "get_xdlc_control()" or "dissect_xdlc_control()", and evaluates to
+ * TRUE if the frame is an "information" frame and FALSE if it isn't.
+ * Note that frames other than information frames can have data in them,
+ * e.g. TEST frames.
+ */
+#define XDLC_IS_INFORMATION(control) \
+ (((control) & 0x1) == XDLC_I || (control) == (XDLC_UI|XDLC_U))
+
+/*
+ * This macro takes the control field of an xDLC frame, and a flag saying
+ * whether we're doing basic or extended operation, and evaluates to
+ * the length of that field (if it's an Unnumbered frame, or we're not
+ * in extended mode, it's 1 byte long, otherwise it's 2 bytes long).
+ */
+#define XDLC_CONTROL_LEN(control, is_extended) \
+ ((((control) & 0x3) == XDLC_U || !(is_extended)) ? 1 : 2)
+
+int get_xdlc_control(const guchar *pd, int offset,
int extended);
-int dissect_xdlc_control(const u_char *pd, int offset, frame_data *fd,
- proto_tree *xdlc_tree, int hf_xdlc_control, int is_response, int extended);
+int dissect_xdlc_control(tvbuff_t *tvb, int offset, packet_info *pinfo,
+ proto_tree *xdlc_tree, int hf_xdlc_control, gint ett_xdlc_control,
+ int is_response, int extended);
+
+#endif