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/* packet-elmi.c
* Routines for Ethernet Local Management Interface (E-LMI) dissection
* Copyright 2014, Martin Kaiser <martin@kaiser.cx>
*
* based on a dissector written in lua
* Copyright 2013, Werner Fischer (fischer-interactive.de)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* E-LMI is defined in the MEF16 specification from Metro Ethernet Forum
http://www.metroethernetforum.org/PDF_Documents/technical-specifications/MEF16.pdf */
#include "config.h"
#include <glib.h>
#include <epan/value_string.h>
#include <epan/etypes.h>
#include <epan/packet.h>
static int proto_elmi = -1;
void proto_register_elmi(void);
void proto_reg_handoff_elmi(void);
static gint ett_elmi = -1;
static gint ett_elmi_info_elem = -1;
static int hf_elmi_ver = -1;
static int hf_elmi_msg_type = -1;
static int hf_elmi_info_elem = -1;
static int hf_elmi_info_elem_len = -1;
static int hf_elmi_report_type = -1;
static int hf_elmi_snd_seq_num = -1;
static int hf_elmi_rcv_seq_num = -1;
static int hf_elmi_dat_inst = -1;
static const value_string elmi_msg_type[] = {
{ 0x75, "Status enquiry" },
{ 0x7C, "Status" },
{ 0, NULL }
};
#define TAG_REPORT_TYPE 0x01
#define TAG_SEQ_NUM 0x02
#define TAG_DATA_INST 0x03
static const value_string elmi_info_elem_tag[] = {
{ TAG_REPORT_TYPE, "Report type" },
{ TAG_SEQ_NUM, "Sequence numbers" },
{ TAG_DATA_INST, "Data instance" },
{ 0, NULL }
};
static const value_string elmi_report_type[] = {
{ 0x00, "Full status" },
{ 0x01, "E-LMI check" },
{ 0x02, "Single EVC async status" },
{ 0x03, "Full status continued" },
{ 0, NULL }
};
static gint
dissect_elmi_info_elem(
tvbuff_t *tvb, gint offset, packet_info *pinfo _U_, proto_tree *tree)
{
gint offset_start;
guint8 tag, len;
proto_item *tree_pi;
proto_tree *info_elem_tree;
offset_start = offset;
tag = tvb_get_guint8(tvb, offset);
if (tag==0)
return -1;
tree_pi = proto_tree_add_text(
tree, tvb, offset, -1, "Information element: %s",
val_to_str_const(tag, elmi_info_elem_tag, "unknown"));
info_elem_tree = proto_item_add_subtree(tree_pi, ett_elmi_info_elem);
proto_tree_add_item(info_elem_tree, hf_elmi_info_elem,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
len = tvb_get_guint8(tvb, offset);
proto_tree_add_item(info_elem_tree, hf_elmi_info_elem_len,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
switch (tag) {
case TAG_REPORT_TYPE:
proto_tree_add_item(info_elem_tree, hf_elmi_report_type,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
break;
case TAG_SEQ_NUM:
proto_tree_add_item(info_elem_tree, hf_elmi_snd_seq_num,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(info_elem_tree, hf_elmi_rcv_seq_num,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
break;
case TAG_DATA_INST:
proto_tree_add_text(info_elem_tree, tvb, offset, 1, "Reserved");
offset++;
proto_tree_add_item(info_elem_tree, hf_elmi_dat_inst,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
break;
default:
offset += len;
break;
}
proto_item_set_len(tree_pi, offset-offset_start);
return offset-offset_start;
}
static int
dissect_elmi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item *pi;
proto_tree *elmi_tree;
gint offset=0;
guint8 msg_type;
gint ret;
col_clear(pinfo->cinfo, COL_INFO);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "E-LMI");
pi = proto_tree_add_protocol_format(tree, proto_elmi,
tvb, 0, tvb_captured_length(tvb),
"Ethernet Local Management Interface (E-LMI)");
elmi_tree = proto_item_add_subtree(pi, ett_elmi);
proto_tree_add_item(elmi_tree, hf_elmi_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
msg_type = tvb_get_guint8(tvb, offset);
proto_tree_add_item(elmi_tree, hf_elmi_msg_type,
tvb, offset, 1, ENC_BIG_ENDIAN);
col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
val_to_str(msg_type, elmi_msg_type, "unknown (0x%x)"));
offset++;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
ret = dissect_elmi_info_elem(tvb, offset, pinfo, elmi_tree);
if (ret<=0)
break;
offset += ret;
}
/* XXX - can we make the eth dissector handle our (standard) padding
* and FCS? */
return tvb_captured_length(tvb);
}
void
proto_register_elmi(void)
{
static hf_register_info hf[] = {
{ &hf_elmi_ver,
{ "Version", "elmi.version", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL } },
{ &hf_elmi_msg_type,
{ "Message type", "elmi.message_type", FT_UINT8, BASE_HEX,
VALS(elmi_msg_type), 0, NULL, HFILL } },
{ &hf_elmi_info_elem,
{ "Tag", "elmi.info_element.tag", FT_UINT8, BASE_HEX,
VALS(elmi_info_elem_tag), 0, NULL, HFILL } },
{ &hf_elmi_info_elem_len,
{ "Length", "elmi.info_element.length", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL } },
{ &hf_elmi_report_type,
{ "Report type", "elmi.report_type", FT_UINT8, BASE_DEC,
VALS(elmi_report_type), 0, NULL, HFILL } },
{ &hf_elmi_snd_seq_num,
{ "Send sequence number", "elmi.snd_seq_num", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL } },
{ &hf_elmi_rcv_seq_num,
{ "Receive sequence number", "elmi.rcv_seq_num", FT_UINT8, BASE_DEC,
NULL, 0, NULL, HFILL } },
{ &hf_elmi_dat_inst,
{ "Data instance", "elmi.data_instance", FT_UINT32, BASE_HEX,
NULL, 0, NULL, HFILL } }
};
static gint *ett[] = {
&ett_elmi,
&ett_elmi_info_elem
};
proto_elmi = proto_register_protocol(
"Ethernet Local Management Interface", "E-LMI", "elmi");
proto_register_field_array(proto_elmi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_elmi(void)
{
dissector_handle_t elmi_handle;
elmi_handle = new_create_dissector_handle(dissect_elmi, proto_elmi);
dissector_add_uint("ethertype", ETHERTYPE_ELMI, elmi_handle);
}
/*
* Editor modelines - http://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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