2 * Define *DLC frame types, and routine to dissect the control field of
5 * $Id: xdlc.h,v 1.18 2003/09/02 19:18:52 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@zing.org>
9 * Copyright 1998 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 * Low-order bits of first (extended) or only (basic) octet of control
32 * field, specifying the frame type.
34 #define XDLC_I 0x00 /* Information frames */
35 #define XDLC_S 0x01 /* Supervisory frames */
36 #define XDLC_U 0x03 /* Unnumbered frames */
41 #define XDLC_U_MODIFIER_MASK 0xEC
42 #define XDLC_UI 0x00 /* Unnumbered Information */
43 #define XDLC_UP 0x20 /* Unnumbered Poll */
44 #define XDLC_DISC 0x40 /* Disconnect (command) */
45 #define XDLC_RD 0x40 /* Request Disconnect (response) */
46 #define XDLC_UA 0x60 /* Unnumbered Acknowledge */
47 #define XDLC_SNRM 0x80 /* Set Normal Response Mode */
48 #define XDLC_TEST 0xE0 /* Test */
49 #define XDLC_SIM 0x04 /* Set Initialization Mode (command) */
50 #define XDLC_RIM 0x04 /* Request Initialization Mode (response) */
51 #define XDLC_FRMR 0x84 /* Frame reject */
52 #define XDLC_CFGR 0xC4 /* Configure */
53 #define XDLC_SARM 0x0C /* Set Asynchronous Response Mode (command) */
54 #define XDLC_DM 0x0C /* Disconnected mode (response) */
55 #define XDLC_SABM 0x2C /* Set Asynchronous Balanced Mode */
56 #define XDLC_SARME 0x4C /* Set Asynchronous Response Mode Extended */
57 #define XDLC_SABME 0x6C /* Set Asynchronous Balanced Mode Extended */
58 #define XDLC_RESET 0x8C /* Reset */
59 #define XDLC_XID 0xAC /* Exchange identification */
60 #define XDLC_SNRME 0xCC /* Set Normal Response Mode Extended */
61 #define XDLC_BCN 0xEC /* Beacon */
64 * This macro takes the control field of an xDLC frame, as returned by
65 * "get_xdlc_control()" or "dissect_xdlc_control()", and evaluates to
66 * TRUE if the frame is an "information" frame and FALSE if it isn't.
67 * Note that frames other than information frames can have data in them,
70 #define XDLC_IS_INFORMATION(control) \
71 (((control) & 0x1) == XDLC_I || (control) == (XDLC_UI|XDLC_U))
74 * This macro takes the control field of an xDLC frame, and a flag saying
75 * whether we're doing basic or extended operation, and evaluates to
76 * the length of that field (if it's an Unnumbered frame, or we're not
77 * in extended mode, it's 1 byte long, otherwise it's 2 bytes long).
79 #define XDLC_CONTROL_LEN(control, is_extended) \
80 ((((control) & 0x3) == XDLC_U || !(is_extended)) ? 1 : 2)
82 int get_xdlc_control(const guchar *pd, int offset,
85 int dissect_xdlc_control(tvbuff_t *tvb, int offset, packet_info *pinfo,
86 proto_tree *xdlc_tree, int hf_xdlc_control, gint ett_xdlc_control,
87 int is_response, int extended, int append_info);