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/* packet-qllc.c
* Routines for QLLC protocol - Qualified? LLC
* Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 2001 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_qllc(void);
void proto_reg_handoff_qllc(void);
static int proto_qllc;
static int hf_qllc_address;
static int hf_qllc_control;
static int ett_qllc;
static dissector_handle_t sna_handle;
#define QSM 0x93
#define QDISC 0x53
#define QXID 0xbf
#define QTEST 0xf3
#define QRR 0xf1
#define QRD 0x53
#define QUA 0x73
#define QDM 0x1f
#define QFRMR 0x97
#define QUI 0x03
#define QUI_NO_REPLY 0x13
#define QSIM 0x17
#define QRD_QDISC_VALUE 0x53
#define QDISC_TEXT "QDISC"
#define QRD_TEXT "QRD"
/* Control Field */
static const value_string qllc_control_vals[] = {
{ QUI, "QUI" },
{ QUI_NO_REPLY, "QUI - reply required" },
{ QSIM, "QSIM" },
{ QDM, "QDM" },
{ QUA, "QUA" },
{ QSM, "QSM" },
{ QFRMR, "QFRMR" },
{ QXID, "QXID" },
{ QRR, "QRR" },
{ QTEST, "QTEST" },
{ QDISC, "QDISC / QRD" }, /* Same value for QDISC and QRD (following it is a COMMAND or RESPONSE) */
{ 0x00, NULL },
};
static int
dissect_qllc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
proto_tree *qllc_tree;
proto_item *qllc_ti;
bool *q_bit_set;
uint8_t addr, ctrl;
bool command = false;
/* Reject the packet if data is NULL */
if (data == NULL)
return 0;
q_bit_set = (bool *)data;
/*
* If the Q bit isn't set, this is just SNA data.
*/
if (!(*q_bit_set)) {
call_dissector(sna_handle, tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
/* Summary information */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "QLLC");
col_clear(pinfo->cinfo, COL_INFO);
qllc_ti = proto_tree_add_item(tree, proto_qllc, tvb, 0, -1, ENC_NA);
qllc_tree = proto_item_add_subtree(qllc_ti, ett_qllc);
/* Get the address; we need it to determine if this is a
* COMMAND or a RESPONSE */
addr = tvb_get_uint8(tvb, 0);
proto_tree_add_item(qllc_tree, hf_qllc_address, tvb, 0, 1, ENC_BIG_ENDIAN);
/* The address field equals X'FF' in commands (except QRR)
* and anything in responses. */
ctrl = tvb_get_uint8(tvb, 1);
if (ctrl != QRR && addr == 0xff) {
command = true;
}
/* Disambiguate QRD_QDISC_VALUE, based on whether this packet is
* a COMMAND or RESPONSE. */
if (ctrl == QRD_QDISC_VALUE) {
if (command) {
col_set_str(pinfo->cinfo, COL_INFO, QDISC_TEXT);
proto_tree_add_uint_format_value(qllc_tree, hf_qllc_control, tvb,
1, 1, ctrl, "%s (0x%02x)", QDISC_TEXT, ctrl);
}
else {
col_set_str(pinfo->cinfo, COL_INFO, QRD_TEXT);
proto_tree_add_uint_format_value(qllc_tree, hf_qllc_control, tvb,
1, 1, ctrl, "%s (0x%02x)", QRD_TEXT, ctrl);
}
}
else {
/* Non-ambiguous control field value */
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(ctrl, qllc_control_vals,
"Control Field: 0x%02x (unknown)"));
proto_tree_add_uint(qllc_tree, hf_qllc_control, tvb,
1, 1, ctrl);
}
/* Do we have an I field ? */
/* XXX - I field exists for QUI too, but only for subarea nodes.
* Need to test for this. */
if (ctrl == QXID || ctrl == QTEST || ctrl == QFRMR) {
/* yes */
}
return tvb_captured_length(tvb);
}
void
proto_register_qllc(void)
{
static hf_register_info hf[] = {
{ &hf_qllc_address,
{ "Address Field", "qllc.address", FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_qllc_control,
{ "Control Field", "qllc.control", FT_UINT8, BASE_HEX,
VALS(qllc_control_vals), 0x0, NULL, HFILL }},
};
static int *ett[] = {
&ett_qllc,
};
proto_qllc = proto_register_protocol("Qualified Logical Link Control", "QLLC", "qllc");
proto_register_field_array(proto_qllc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("qllc", dissect_qllc, proto_qllc);
}
void
proto_reg_handoff_qllc(void)
{
sna_handle = find_dissector_add_dependency("sna", proto_qllc);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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