eb2d6593dc
arguments to "proto_tree_add_text()", and to "proto_tree_add_XXX()" calls that add FT_NONE or FT_PROTO items to the protocol tree, with -1. Replace some calls to "tvb_length()" or "tvb_length_remaining()" with calls to "tvb_reported_length()" and "tvb_reported_length_remaining()", as those give the actual length of the data in the packet, not just the data that happened to be captured. svn path=/trunk/; revision=4605
191 lines
5.4 KiB
C
191 lines
5.4 KiB
C
/* packet-qllc.c
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* Routines for QLLC protocol - Qualified? LLC
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* Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* $Id: packet-qllc.c,v 1.5 2002/01/24 09:20:50 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 2001 Gerald Combs
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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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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static int proto_qllc = -1;
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static int hf_qllc_address = -1;
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static int hf_qllc_control = -1;
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static gint ett_qllc = -1;
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#define QSM 0x93
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#define QDISC 0x53
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#define QXID 0xbf
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#define QTEST 0xf3
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#define QRR 0xf1
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#define QRD 0x53
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#define QUA 0x73
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#define QDM 0x1f
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#define QFRMR 0x97
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#define QUI 0x03
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#define QUI_NO_REPLY 0x13
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#define QSIM 0x17
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#define QRD_QDISC_VALUE 0x53
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#define QDISC_TEXT "QDISC"
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#define QRD_TEXT "QRD"
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/* Control Field */
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static const value_string qllc_control_vals[] = {
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{ QUI, "QUI" },
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{ QUI_NO_REPLY, "QUI - reply required" },
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{ QSIM, "QSIM" },
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{ QDM, "QDM" },
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{ QUA, "QUA" },
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{ QSM, "QSM" },
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{ QFRMR, "QFRMR" },
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{ QXID, "QXID" },
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{ QRR, "QRR" },
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{ QTEST, "QTEST" },
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{ QDISC, QDISC_TEXT },
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{ QRD, QRD_TEXT },
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{ 0x00, NULL },
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};
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static void
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dissect_qllc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *qllc_tree = NULL;
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proto_item *qllc_ti = NULL;
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guint8 address, ctrl;
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gboolean command = FALSE;
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/* Summary information */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "QLLC");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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qllc_ti = proto_tree_add_item(tree, proto_qllc, tvb, 0, -1,
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FALSE);
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qllc_tree = proto_item_add_subtree(qllc_ti, ett_qllc);
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}
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/* Get the address; we need it to determine if this is a
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* COMMAND or a RESPONSE */
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address = tvb_get_guint8(tvb, 0);
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if (tree) {
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proto_tree_add_item(qllc_tree, hf_qllc_address, tvb, 0, 1, FALSE);
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}
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/* The address field equals X'FF' in commands (except QRR)
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* and anything in responses. */
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ctrl = tvb_get_guint8(tvb, 1);
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if (ctrl != QRR && address == 0xff) {
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command = TRUE;
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}
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/* Disambiguate QRD_QDISC_VALUE, based on whether this packet is
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* a COMMAND or RESPONSE. */
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if (ctrl == QRD_QDISC_VALUE) {
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if (command) {
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_set_str(pinfo->cinfo, COL_INFO, QDISC_TEXT);
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}
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if (tree) {
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proto_tree_add_text(qllc_tree, tvb,
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1, 1, "Control Field: %s (0x%02x)", QDISC_TEXT, ctrl);
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}
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}
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else {
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_set_str(pinfo->cinfo, COL_INFO, QRD_TEXT);
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}
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if (tree) {
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proto_tree_add_text(qllc_tree, tvb,
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1, 1, "Control Field: %s (0x%02x)", QRD_TEXT, ctrl);
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}
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}
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/* Add the field for filtering purposes */
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if (tree) {
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proto_tree_add_uint_hidden(qllc_tree, hf_qllc_control, tvb,
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1, 1, ctrl);
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}
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}
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else {
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/* Non-ambiguous control field value */
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_set_str(pinfo->cinfo, COL_INFO,
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val_to_str(ctrl, qllc_control_vals,
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"Control Field: 0x%02x (unknown)"));
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}
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if (tree) {
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proto_tree_add_uint(qllc_tree, hf_qllc_control, tvb,
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1, 1, ctrl);
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}
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}
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/* Do we have an I field ? */
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/* XXX - I field exists for QUI too, but only for subarea nodes.
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* Need to test for this. */
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if (ctrl == QXID || ctrl == QTEST || ctrl == QFRMR) {
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/* yes */
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}
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}
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void
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proto_register_qllc(void)
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{
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static hf_register_info hf[] = {
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{ &hf_qllc_address,
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{ "Address Field", "qllc.address", FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL }},
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{ &hf_qllc_control,
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{ "Control Field", "qllc.control", FT_UINT8, BASE_HEX,
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VALS(qllc_control_vals), 0x0, "", HFILL }},
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};
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static gint *ett[] = {
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&ett_qllc,
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};
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proto_qllc = proto_register_protocol("Qualified Logical Link Control",
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"QLLC", "qllc");
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proto_register_field_array(proto_qllc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("qllc", dissect_qllc, proto_qllc);
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}
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