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/* packet-at-rl.c
* Dissector for Allied Telesis Resiliency Link Frames
*
* Copyright (c) 2024 by Martin Mayer <martin.mayer@m2-it-solutions.de>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/etypes.h>
#include <epan/packet.h>
void proto_register_at_rl(void);
void proto_reg_handoff_at_rl(void);
static dissector_handle_t at_rl_handle;
static int proto_at_rl;
#define AT_RL_FRAME_LEN 18
/* Fields */
static int hf_at_rl_sequence;
static int hf_at_rl_master;
static int hf_at_rl_padding;
static int hf_at_rl_vcsid;
static int hf_at_rl_role_change;
static int ett_at_rl;
static int
dissect_at_rl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
/* Check if packet is destined to the Allied Telesis address (01:00:CD:FA:1B:AC) */
uint8_t dst_mac[6] = {0x01, 0x00, 0xCD, 0xFA, 0x1B, 0xAC};
address dst_addr = ADDRESS_INIT_NONE;
set_address(&dst_addr, AT_ETHER, sizeof(dst_mac), &dst_mac);
if(!addresses_equal(&pinfo->dl_dst, &dst_addr))
return 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "AT RL");
col_clear(pinfo->cinfo,COL_INFO);
col_add_fstr(pinfo->cinfo, COL_INFO, "Seq: %u, VCS-ID: %u",
tvb_get_uint32(tvb, 0, ENC_BIG_ENDIAN),
tvb_get_uint16(tvb, 12, ENC_BIG_ENDIAN));
/* Frame has fixed length, so we can directly set tree and reported length (padding will most likely be added) */
tvb_set_reported_length(tvb, AT_RL_FRAME_LEN);
proto_item *ti = proto_tree_add_item(tree, proto_at_rl, tvb, 0, AT_RL_FRAME_LEN, ENC_NA);
proto_tree *at_rl_tree = proto_item_add_subtree(ti, ett_at_rl);
int offset = 0;
proto_tree_add_item(at_rl_tree, hf_at_rl_sequence, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(at_rl_tree, hf_at_rl_master, tvb, offset, 6, ENC_NA);
offset += 6;
proto_tree_add_item(at_rl_tree, hf_at_rl_padding, tvb, offset, 2, ENC_NA);
offset += 2;
proto_tree_add_item(at_rl_tree, hf_at_rl_vcsid, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(at_rl_tree, hf_at_rl_role_change, tvb, offset, 4, ENC_TIME_SECS);
return AT_RL_FRAME_LEN;
}
void
proto_register_at_rl(void)
{
static hf_register_info hf[] = {
{ &hf_at_rl_sequence,
{ "Sequence No.", "atrl.sequence",
FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
},
{ &hf_at_rl_master,
{ "Active Master", "atrl.master",
FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }
},
{ &hf_at_rl_padding,
{ "Padding", "atrl.padding",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
},
{ &hf_at_rl_vcsid,
{ "Virtual Chassis Stack ID", "atrl.vcsid",
FT_UINT16, BASE_DEC_HEX, NULL, 0x0, NULL, HFILL }
},
{ &hf_at_rl_role_change,
{ "Last Role Change", "atrl.role_change",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL }
}
};
static int *ett[] = {
&ett_at_rl
};
proto_at_rl = proto_register_protocol ("Allied Telesis Resiliency Link", "AT RL", "atrl");
proto_register_field_array(proto_at_rl, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
at_rl_handle = register_dissector("atrl", dissect_at_rl, proto_at_rl);
}
void
proto_reg_handoff_at_rl(void)
{
dissector_add_uint("ethertype", ETHERTYPE_ATRL, at_rl_handle);
}
/*
* 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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