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/* packet-hsr.c
* Routines for HSR dissection (IEC62439 Part 3)
* Copyright 2009, Florian Reichert <refl[AT]zhaw.ch>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald[AT]wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
void proto_register_hsr(void);
void proto_reg_handoff_hsr(void);
static dissector_handle_t hsr_frame_handle;
/**********************************************************/
/* Lengths of fields within a HSR packet. */
/**********************************************************/
#define HSR_LSDU_PATH_LENGTH 2
#define HSR_SEQUENZNR_LENGTH 2
#define HSR_TOTAL_LENGTH 4
/**********************************************************/
/* Offsets of fields within a HSR packet. */
/**********************************************************/
#define HSR_PATH_OFFSET 0
#define HSR_SEQUENZNR_OFFSET 2
static const value_string hsr_laneid_vals[] = {
{0, "Lane A"},
{1, "Lane B"},
{0, NULL}
};
/**********************************************************/
/* Initialize the protocol and registered fields */
/**********************************************************/
static int proto_hsr = -1;
/* Initialize supervision frame fields */
static int hf_hsr_path = -1;
static int hf_hsr_netid = -1;
static int hf_hsr_laneid = -1;
static int hf_hsr_lsdu_size = -1;
static int hf_hsr_sequence_nr = -1;
static int hf_type= -1;
static dissector_table_t ethertype_subdissector_table;
/* Initialize the subtree pointers */
static gint ett_hsr_frame = -1;
/* Code to actually dissect the packets */
static int
dissect_hsr_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *hsr_tree;
tvbuff_t *next_tvb;
guint16 etype;
guint16 lsdu_size, lsdu_size_correct;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "HSR");
col_set_str(pinfo->cinfo, COL_INFO, "HSR-Data Frame");
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_hsr, tvb, 0, HSR_TOTAL_LENGTH, ENC_NA);
hsr_tree = proto_item_add_subtree(ti, ett_hsr_frame);
proto_tree_add_item(hsr_tree, hf_hsr_path,
tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH , ENC_BIG_ENDIAN);
proto_tree_add_item(hsr_tree, hf_hsr_netid,
tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH , ENC_BIG_ENDIAN);
proto_tree_add_item(hsr_tree, hf_hsr_laneid,
tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH , ENC_BIG_ENDIAN);
lsdu_size = tvb_get_ntohs(tvb, HSR_PATH_OFFSET) & 0x0fff;
lsdu_size_correct = tvb_reported_length_remaining(tvb, 0);
if (lsdu_size == lsdu_size_correct) {
proto_tree_add_uint_format_value(hsr_tree, hf_hsr_lsdu_size,
tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH, lsdu_size,
"%d [correct]", lsdu_size);
} else {
proto_tree_add_uint_format_value(hsr_tree, hf_hsr_lsdu_size,
tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH, lsdu_size,
"%d [WRONG, should be %d]", lsdu_size, lsdu_size_correct);
}
proto_tree_add_item(hsr_tree, hf_hsr_sequence_nr,
tvb, HSR_SEQUENZNR_OFFSET,HSR_SEQUENZNR_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(hsr_tree, hf_type,
tvb, HSR_TOTAL_LENGTH,2, ENC_BIG_ENDIAN);
next_tvb = tvb_new_subset_remaining(tvb, HSR_TOTAL_LENGTH + 2);
etype = tvb_get_ntohs(tvb, HSR_TOTAL_LENGTH);
if (!dissector_try_uint(ethertype_subdissector_table, etype, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, hsr_tree);
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void proto_register_hsr(void)
{
static hf_register_info hf[] = {
{ &hf_hsr_path,
{ "Path", "hsr.path",
FT_UINT16, BASE_DEC, NULL, 0xf000,
NULL, HFILL }
},
{ &hf_hsr_netid,
{ "Network id", "hsr.netid",
FT_UINT16, BASE_DEC, NULL, 0xe000,
NULL, HFILL }
},
{ &hf_hsr_laneid,
{ "Lane id", "hsr.laneid",
FT_UINT16, BASE_DEC, VALS(hsr_laneid_vals), 0x1000,
NULL, HFILL }
},
{ &hf_hsr_lsdu_size,
{ "LSDU size", "hsr.lsdu_size",
FT_UINT16, BASE_DEC, NULL, 0x0fff,
NULL, HFILL }
},
{ &hf_hsr_sequence_nr,
{ "Sequence number", "hsr.sequence_nr",
FT_UINT16, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_type,
{ "Type", "hsr.type",
FT_UINT16, BASE_HEX, VALS(etype_vals), 0x00,
NULL, HFILL }
}
};
static gint *ett[] = {
&ett_hsr_frame,
};
/* Register the protocol name and description */
proto_hsr = proto_register_protocol("High-availability Seamless Redundancy (IEC62439 Part 3 Chapter 5)",
"HSR", "hsr");
/* Required function calls to register the header fields and subtree used */
proto_register_field_array(proto_hsr, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
hsr_frame_handle = register_dissector("hsr", dissect_hsr_frame, proto_hsr);
}
void proto_reg_handoff_hsr(void)
{
dissector_add_uint("ethertype", ETHERTYPE_HSR, hsr_frame_handle);
ethertype_subdissector_table = find_dissector_table("ethertype");
}
/*
* 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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