From 63edea877fe8e3dfeea259d91f72bf830609d5ed Mon Sep 17 00:00:00 2001
From: Guy Harris <guy@alum.mit.edu>
Date: Sun, 26 Sep 1999 20:31:51 +0000
Subject: Have "get_xdlc_control()" and "dissect_xdlc_control()" return the
 xDLC control field, so that its caller can not only determine from it whether
 the frame has a payload, but can also determine how long the control field
 is.  Put macros in "xdlc.h" to determine both of those.

Have "capture_llc()" and "dissect_llc()" use that information
appropriately.

svn path=/trunk/; revision=727
---
 xdlc.h | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

(limited to 'xdlc.h')

diff --git a/xdlc.h b/xdlc.h
index 69fb908c34..d3092719c0 100644
--- a/xdlc.h
+++ b/xdlc.h
@@ -2,7 +2,7 @@
  * Define *DLC frame types, and routine to dissect the control field of
  * a *DLC frame.
  *
- * $Id: xdlc.h,v 1.3 1999/08/23 23:24:36 guy Exp $
+ * $Id: xdlc.h,v 1.4 1999/09/26 20:31:51 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@unicom.net>
@@ -32,6 +32,49 @@
 #define XDLC_S		0x01	/* Supervisory frames */
 #define XDLC_U		0x03	/* Unnumbered frames */
 
+/*
+ * U-format modifiers.
+ */
+#define XDLC_U_MODIFIER_MASK	0xEC
+#define XDLC_UI		0x00	/* Unnumbered Information */
+#define XDLC_UP		0x20	/* Unnumbered Poll */
+#define XDLC_DISC	0x40	/* Disconnect (command) */
+#define XDLC_RD		0x40	/* Request Disconnect (response) */
+#define XDLC_UA		0x60	/* Unnumbered Acknowledge */
+#define XDLC_SNRM	0x80	/* Set Normal Response Mode */
+#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_CFGR	0xC4	/* Configure */
+#define XDLC_SARM	0x0C	/* Set Asynchronous Response Mode (command) */
+#define XDLC_DM		0x0C	/* Disconnected mode (response) */
+#define XDLC_SABM	0x2C	/* Set Asynchronous Balanced Mode */
+#define XDLC_SARME	0x4C	/* Set Asynchronous Response Mode Extended */
+#define XDLC_SABME	0x6C	/* Set Asynchronous Balanced Mode Extended */
+#define XDLC_RESET	0x8C	/* Reset */
+#define XDLC_XID	0xAC	/* Exchange identification */
+#define XDLC_SNRME	0xCC	/* Set Normal Response Mode Extended */
+#define XDLC_BCN	0xEC	/* Beacon */
+
+/*
+ * 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 has a payload (i.e., if it's an Information or
+ * Unnumbered Information frame) and FALSE if it doesn't.
+ */
+#define XDLC_HAS_PAYLOAD(control) \
+	((control) == 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 3 bytes long, otherwise it's 4 bytes long).
+ */
+#define XDLC_CONTROL_LEN(control, is_extended) \
+	(((control) == XDLC_U || !(is_extended)) ? 3 : 4)
+
 int get_xdlc_control(const u_char *pd, int offset, int is_response,
   int extended);
 
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