forked from osmocom/wireshark
90 lines
3.4 KiB
C
90 lines
3.4 KiB
C
/* xdlc.h
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* Define *DLC frame types, and routine to dissect the control field of
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* a *DLC frame.
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*
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* $Id: xdlc.h,v 1.18 2003/09/02 19:18:52 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __XDLC_H__
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#define __XDLC_H__
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/*
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* Low-order bits of first (extended) or only (basic) octet of control
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* field, specifying the frame type.
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*/
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#define XDLC_I 0x00 /* Information frames */
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#define XDLC_S 0x01 /* Supervisory frames */
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#define XDLC_U 0x03 /* Unnumbered frames */
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/*
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* U-format modifiers.
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*/
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#define XDLC_U_MODIFIER_MASK 0xEC
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#define XDLC_UI 0x00 /* Unnumbered Information */
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#define XDLC_UP 0x20 /* Unnumbered Poll */
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#define XDLC_DISC 0x40 /* Disconnect (command) */
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#define XDLC_RD 0x40 /* Request Disconnect (response) */
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#define XDLC_UA 0x60 /* Unnumbered Acknowledge */
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#define XDLC_SNRM 0x80 /* Set Normal Response Mode */
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#define XDLC_TEST 0xE0 /* Test */
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#define XDLC_SIM 0x04 /* Set Initialization Mode (command) */
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#define XDLC_RIM 0x04 /* Request Initialization Mode (response) */
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#define XDLC_FRMR 0x84 /* Frame reject */
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#define XDLC_CFGR 0xC4 /* Configure */
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#define XDLC_SARM 0x0C /* Set Asynchronous Response Mode (command) */
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#define XDLC_DM 0x0C /* Disconnected mode (response) */
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#define XDLC_SABM 0x2C /* Set Asynchronous Balanced Mode */
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#define XDLC_SARME 0x4C /* Set Asynchronous Response Mode Extended */
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#define XDLC_SABME 0x6C /* Set Asynchronous Balanced Mode Extended */
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#define XDLC_RESET 0x8C /* Reset */
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#define XDLC_XID 0xAC /* Exchange identification */
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#define XDLC_SNRME 0xCC /* Set Normal Response Mode Extended */
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#define XDLC_BCN 0xEC /* Beacon */
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/*
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* This macro takes the control field of an xDLC frame, as returned by
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* "get_xdlc_control()" or "dissect_xdlc_control()", and evaluates to
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* TRUE if the frame is an "information" frame and FALSE if it isn't.
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* Note that frames other than information frames can have data in them,
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* e.g. TEST frames.
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*/
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#define XDLC_IS_INFORMATION(control) \
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(((control) & 0x1) == XDLC_I || (control) == (XDLC_UI|XDLC_U))
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/*
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* This macro takes the control field of an xDLC frame, and a flag saying
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* whether we're doing basic or extended operation, and evaluates to
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* the length of that field (if it's an Unnumbered frame, or we're not
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* in extended mode, it's 1 byte long, otherwise it's 2 bytes long).
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*/
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#define XDLC_CONTROL_LEN(control, is_extended) \
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((((control) & 0x3) == XDLC_U || !(is_extended)) ? 1 : 2)
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int get_xdlc_control(const guchar *pd, int offset,
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int extended);
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int dissect_xdlc_control(tvbuff_t *tvb, int offset, packet_info *pinfo,
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proto_tree *xdlc_tree, int hf_xdlc_control, gint ett_xdlc_control,
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int is_response, int extended, int append_info);
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#endif
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