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|
/* packet-mplstp-oam.c
*
* Routines for MPLS-TP Lock Instruct Protocol : RFC 6435
* MPLS-TP Fault-Management Protocol : RFC 6427
*
* Authors:
* Krishnamurthy Mayya <krishnamurthymayya@gmail.com>
* Nikitha Malgi <nikitha01@gmail.com>
*
* 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/packet.h>
#include "packet-bfd.h"
#include "packet-mpls.h"
void proto_register_mplstp_lock(void);
void proto_register_mplstp_fm(void);
void proto_reg_handoff_mplstp_lock(void);
void proto_reg_handoff_mplstp_fm(void);
static dissector_handle_t mplstp_lock_handle;
static dissector_handle_t mplstp_fm_handle;
/* MPLS-TP FM protocol specific variables */
static gint proto_mplstp_fm = -1;
static gint ett_mplstp_fm = -1;
static gint ett_mplstp_fm_flags = -1;
static gint ett_mplstp_fm_tlv_tree = -1;
static int hf_mplstp_fm_version = -1;
static int hf_mplstp_fm_reserved = -1;
static int hf_mplstp_fm_msg_type = -1;
static int hf_mplstp_fm_flags = -1;
static int hf_mplstp_fm_flags_l = -1;
static int hf_mplstp_fm_flags_r = -1;
static int hf_mplstp_fm_refresh_timer = -1;
static int hf_mplstp_fm_total_tlv_len = -1;
static int hf_mplstp_fm_if_tlv_type = -1;
static int hf_mplstp_fm_global_tlv_type = -1;
static int hf_mplstp_fm_tlv_len = -1;
static int hf_mplstp_fm_node_id = -1;
static int hf_mplstp_fm_if_num = -1;
static int hf_mplstp_fm_global_id = -1;
static const value_string fm_msg_type[] = {
{0, "No Return Code"},
{1, "Alarm-Indication Signal(A)"},
{2, "Lock-Report(L)"},
{0, NULL}
};
/* MPLS-TP Lock protocol specific variables */
static gint proto_mplstp_lock = -1;
static gint ett_mplstp_lock = -1;
static int hf_mplstp_lock_version = -1;
static int hf_mplstp_lock_reserved = -1;
static int hf_mplstp_lock_refresh_timer = -1;
static void
dissect_mplstp_fm_tlv (tvbuff_t *tvb, proto_tree *tree)
{
proto_item *ti;
proto_tree *fm_tlv_tree;
guint offset = 0;
if (!tree)
return;
ti = proto_tree_add_protocol_format (tree, proto_mplstp_fm, tvb, offset, 16,
"Fault-Management TLVs");
fm_tlv_tree = proto_item_add_subtree (ti, ett_mplstp_fm_tlv_tree);
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_if_tlv_type , tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_tlv_len, tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_node_id, tvb, offset,
4, ENC_BIG_ENDIAN);
offset = offset + 4;
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_if_num, tvb, offset,
4, ENC_BIG_ENDIAN);
offset = offset + 4;
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_global_tlv_type , tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_tlv_len, tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
proto_tree_add_item (fm_tlv_tree, hf_mplstp_fm_global_id, tvb, offset,
4, ENC_BIG_ENDIAN);
/* offset = offset + 4; */
return;
}
/* Dissector for MPLS-TP LI protocol: RFC 6435 */
static int
dissect_mplstp_lock(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *lock_tree;
tvbuff_t *next_tvb;
guint8 offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPLS-TP LI");
col_clear(pinfo->cinfo, COL_INFO);
if (!tree)
return tvb_captured_length(tvb);
ti = proto_tree_add_item(tree, proto_mplstp_lock, tvb, 0, -1, ENC_NA);
lock_tree = proto_item_add_subtree (ti, ett_mplstp_lock);
/* Version field */
proto_tree_add_item (lock_tree, hf_mplstp_lock_version , tvb, offset,
1, ENC_BIG_ENDIAN);
/* Reserved field */
proto_tree_add_item (lock_tree, hf_mplstp_lock_reserved, tvb, offset,
3, ENC_BIG_ENDIAN);
offset = offset + 3;
/* Refresh-Timer field */
proto_tree_add_item (lock_tree, hf_mplstp_lock_refresh_timer, tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
/* Source-MEP TLVs */
next_tvb = tvb_new_subset_remaining (tvb, offset);
dissect_bfd_mep (next_tvb, tree, proto_mplstp_lock);
return tvb_captured_length(tvb);
}
/* Dissector for MPLS-TP FM protocol: RFC 6427 */
static int
dissect_mplstp_fm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti, *ti_flags;
proto_tree *fm_tree, *fm_flags;
guint8 offset = 0;
guint8 tlv_len;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPLS-TP FM");
col_clear(pinfo->cinfo, COL_INFO);
tlv_len = tvb_get_guint8 (tvb, (offset + 4));
if (!tree)
return tvb_captured_length(tvb);
ti = proto_tree_add_item(tree, proto_mplstp_fm, tvb, 0, (tlv_len + 5), ENC_NA);
fm_tree = proto_item_add_subtree (ti, ett_mplstp_fm);
/* Version and Reserved fields */
proto_tree_add_item (fm_tree, hf_mplstp_fm_version , tvb, offset,
1, ENC_BIG_ENDIAN);
proto_tree_add_item (fm_tree, hf_mplstp_fm_reserved, tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
/* FM-Message type field */
proto_tree_add_item (fm_tree, hf_mplstp_fm_msg_type, tvb, offset,
1,ENC_BIG_ENDIAN);
offset = offset + 1;
/* Flags field */
ti_flags = proto_tree_add_item (fm_tree, hf_mplstp_fm_flags, tvb,
offset, 1, ENC_BIG_ENDIAN);
fm_flags = proto_item_add_subtree(ti_flags, ett_mplstp_fm_flags);
proto_tree_add_item (fm_flags, hf_mplstp_fm_flags_l, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (fm_flags, hf_mplstp_fm_flags_r, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
/* Refresh-Timer field */
proto_tree_add_item (fm_tree, hf_mplstp_fm_refresh_timer, tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
/* FM-TLV Length field*/
proto_tree_add_item (fm_tree, hf_mplstp_fm_total_tlv_len, tvb, offset,
1, ENC_BIG_ENDIAN);
offset = offset + 1;
if (tlv_len != 0)
{
tvbuff_t *next_tvb;
/* FM TLVs*/
next_tvb = tvb_new_subset_remaining (tvb, offset);
dissect_mplstp_fm_tlv (next_tvb, tree);
}
return tvb_captured_length(tvb);
}
void
proto_register_mplstp_lock(void)
{
static hf_register_info hf[] = {
{&hf_mplstp_lock_version,
{"Version", "mplstp_lock.version", FT_UINT8,
BASE_HEX, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_lock_reserved,
{"Reserved", "mplstp_lock.reserved", FT_UINT24,
BASE_HEX, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_lock_refresh_timer,
{"Refresh-timer value", "mplstp_lock.refresh-timer", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_mplstp_lock,
};
proto_mplstp_lock =
proto_register_protocol("MPLS-TP Lock-Instruct", "MPLS[-TP] Lock-Instruct "
"Lock-Instruct (LI) Protocol",
"mplstp_lock");
proto_register_field_array(proto_mplstp_lock, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mplstp_lock_handle = register_dissector("mplstp_lock", dissect_mplstp_lock, proto_mplstp_lock);
}
void
proto_reg_handoff_mplstp_lock(void)
{
dissector_add_uint("pwach.channel_type", 0x0026, mplstp_lock_handle); /* KM: MPLSTP LOCK, RFC 6435 */
}
void
proto_register_mplstp_fm(void)
{
static hf_register_info hf[] = {
{&hf_mplstp_fm_version,
{"Version", "mplstp_oam.version", FT_UINT8,
BASE_HEX, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_reserved,
{"Reserved", "mplstp_oam.reserved", FT_UINT8,
BASE_HEX, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_refresh_timer,
{"Refresh-timer value", "mplstp_oam.refresh.timer", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_total_tlv_len,
{"FM TLV Length", "mplstp_oam.total.tlv.len", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_if_tlv_type,
{"Type : IF-ID TLV", "mplstp_oam.if_id_tlv_type", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_global_tlv_type,
{"Type : GLOBAL-ID TLV", "mplstp_oam.global_id_tlv_type", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_tlv_len,
{"Length", "mplstp_oam.tlv_len", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_node_id,
{"Node id", "mplstp_oam.node_id", FT_IPv4,
BASE_NONE, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_if_num,
{"Interface Number", "mplstp_oam.if_num", FT_UINT32,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_global_id,
{"Global id", "mplstp_oam.global_id", FT_UINT32,
BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_mplstp_fm_msg_type,
{"Message Type", "mplstp_oam.message.type", FT_UINT8,
BASE_DEC, VALS(fm_msg_type), 0x0, "MPLS-TP FM Message Type", HFILL }},
{ &hf_mplstp_fm_flags,
{ "FM Flags", "mplstp_oam.flags",
FT_UINT8, BASE_HEX, NULL, 0x0, "MPLS-TP FM Flags", HFILL}
},
{ &hf_mplstp_fm_flags_l,
{ "Link Down Indication", "mplstp_oam.flag_l",
FT_BOOLEAN, 8, NULL, 0x02, NULL, HFILL}
},
{ &hf_mplstp_fm_flags_r,
{ "FM Condition Cleared", "mplstp_oam.flag_r",
FT_BOOLEAN, 8, NULL, 0x01, "Fault Condition Cleared", HFILL}
},
};
static gint *ett[] = {
&ett_mplstp_fm,
&ett_mplstp_fm_tlv_tree,
&ett_mplstp_fm_flags,
};
proto_mplstp_fm =
proto_register_protocol("MPLS-TP Fault-Management", "MPLS[-TP] Fault-Management "
"Fault-Management (FM) Protocol",
"mplstp_fm");
proto_register_field_array(proto_mplstp_fm, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mplstp_fm_handle = register_dissector("mplstp_fm", dissect_mplstp_fm, proto_mplstp_fm );
}
void
proto_reg_handoff_mplstp_fm(void)
{
dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_MPLSTP_FM, mplstp_fm_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
|
