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/* packet-elmi.c
* Routines for Ethernet Local Management Interface (E-LMI) dissection
* Copyright 2014, Martin Kaiser <martin@kaiser.cx>
*
* 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 int hf_elmi_ver = -1;
static int hf_elmi_msg_type = -1;
static const value_string elmi_msg_type[] = {
{ 0x75, "Status enquiry" },
{ 0x7C, "Status" },
{ 0, NULL }
};
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;
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)"));
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 } }
};
static gint *ett[] = {
&ett_elmi
};
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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