2013-06-19 06:30:33 +00:00
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/* packet-elmi.c
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* Routines for Ethernet Local Management Interface (E-LMI) dissection
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* Copyright 2014, Martin Kaiser <martin@kaiser.cx>
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*
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2014-04-20 19:34:43 +00:00
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* based on a dissector written in lua
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* Copyright 2013, Werner Fischer (fischer-interactive.de)
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*
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2013-06-19 06:30:33 +00:00
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* E-LMI is defined in the MEF16 specification from Metro Ethernet Forum
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http://www.metroethernetforum.org/PDF_Documents/technical-specifications/MEF16.pdf */
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#include "config.h"
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#include <glib.h>
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#include <epan/value_string.h>
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#include <epan/etypes.h>
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#include <epan/packet.h>
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static int proto_elmi = -1;
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2014-04-21 16:34:14 +00:00
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void proto_register_elmi(void);
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2013-06-19 06:30:33 +00:00
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void proto_reg_handoff_elmi(void);
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static gint ett_elmi = -1;
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2014-04-20 10:53:58 +00:00
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static gint ett_elmi_info_elem = -1;
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2013-06-19 06:30:33 +00:00
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static int hf_elmi_ver = -1;
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static int hf_elmi_msg_type = -1;
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2014-04-20 10:53:58 +00:00
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static int hf_elmi_info_elem = -1;
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static int hf_elmi_info_elem_len = -1;
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static int hf_elmi_report_type = -1;
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static int hf_elmi_snd_seq_num = -1;
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static int hf_elmi_rcv_seq_num = -1;
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static int hf_elmi_dat_inst = -1;
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2013-06-19 06:30:33 +00:00
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static const value_string elmi_msg_type[] = {
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{ 0x75, "Status enquiry" },
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{ 0x7C, "Status" },
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{ 0, NULL }
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};
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2014-04-20 10:53:58 +00:00
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#define TAG_REPORT_TYPE 0x01
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#define TAG_SEQ_NUM 0x02
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#define TAG_DATA_INST 0x03
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static const value_string elmi_info_elem_tag[] = {
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{ TAG_REPORT_TYPE, "Report type" },
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{ TAG_SEQ_NUM, "Sequence numbers" },
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{ TAG_DATA_INST, "Data instance" },
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{ 0, NULL }
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};
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static const value_string elmi_report_type[] = {
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{ 0x00, "Full status" },
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{ 0x01, "E-LMI check" },
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{ 0x02, "Single EVC async status" },
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{ 0x03, "Full status continued" },
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{ 0, NULL }
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};
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static gint
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dissect_elmi_info_elem(
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tvbuff_t *tvb, gint offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset_start;
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guint8 tag, len;
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proto_item *tree_pi;
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proto_tree *info_elem_tree;
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offset_start = offset;
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tag = tvb_get_guint8(tvb, offset);
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if (tag==0)
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return -1;
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tree_pi = proto_tree_add_text(
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tree, tvb, offset, -1, "Information element: %s",
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val_to_str_const(tag, elmi_info_elem_tag, "unknown"));
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info_elem_tree = proto_item_add_subtree(tree_pi, ett_elmi_info_elem);
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proto_tree_add_item(info_elem_tree, hf_elmi_info_elem,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(info_elem_tree, hf_elmi_info_elem_len,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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switch (tag) {
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case TAG_REPORT_TYPE:
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proto_tree_add_item(info_elem_tree, hf_elmi_report_type,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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break;
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case TAG_SEQ_NUM:
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proto_tree_add_item(info_elem_tree, hf_elmi_snd_seq_num,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(info_elem_tree, hf_elmi_rcv_seq_num,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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break;
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case TAG_DATA_INST:
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proto_tree_add_text(info_elem_tree, tvb, offset, 1, "Reserved");
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offset++;
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proto_tree_add_item(info_elem_tree, hf_elmi_dat_inst,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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offset+=4;
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break;
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default:
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offset += len;
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break;
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}
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proto_item_set_len(tree_pi, offset-offset_start);
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return offset-offset_start;
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}
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2013-06-19 06:30:33 +00:00
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static int
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dissect_elmi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *pi;
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proto_tree *elmi_tree;
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gint offset=0;
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guint8 msg_type;
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2014-04-20 10:53:58 +00:00
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gint ret;
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2013-06-19 06:30:33 +00:00
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col_clear(pinfo->cinfo, COL_INFO);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "E-LMI");
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pi = proto_tree_add_protocol_format(tree, proto_elmi,
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tvb, 0, tvb_captured_length(tvb),
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"Ethernet Local Management Interface (E-LMI)");
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elmi_tree = proto_item_add_subtree(pi, ett_elmi);
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proto_tree_add_item(elmi_tree, hf_elmi_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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msg_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(elmi_tree, hf_elmi_msg_type,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
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val_to_str(msg_type, elmi_msg_type, "unknown (0x%x)"));
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2014-04-20 10:53:58 +00:00
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offset++;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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ret = dissect_elmi_info_elem(tvb, offset, pinfo, elmi_tree);
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if (ret<=0)
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break;
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offset += ret;
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}
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2013-06-19 06:30:33 +00:00
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2014-04-20 10:53:58 +00:00
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/* XXX - can we make the eth dissector handle our (standard) padding
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* and FCS? */
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2013-06-19 06:30:33 +00:00
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return tvb_captured_length(tvb);
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}
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void
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proto_register_elmi(void)
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{
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static hf_register_info hf[] = {
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{ &hf_elmi_ver,
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{ "Version", "elmi.version", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_elmi_msg_type,
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{ "Message type", "elmi.message_type", FT_UINT8, BASE_HEX,
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2014-04-20 10:53:58 +00:00
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VALS(elmi_msg_type), 0, NULL, HFILL } },
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{ &hf_elmi_info_elem,
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{ "Tag", "elmi.info_element.tag", FT_UINT8, BASE_HEX,
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VALS(elmi_info_elem_tag), 0, NULL, HFILL } },
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{ &hf_elmi_info_elem_len,
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{ "Length", "elmi.info_element.length", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_elmi_report_type,
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{ "Report type", "elmi.report_type", FT_UINT8, BASE_DEC,
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VALS(elmi_report_type), 0, NULL, HFILL } },
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{ &hf_elmi_snd_seq_num,
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{ "Send sequence number", "elmi.snd_seq_num", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_elmi_rcv_seq_num,
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{ "Receive sequence number", "elmi.rcv_seq_num", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_elmi_dat_inst,
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{ "Data instance", "elmi.data_instance", FT_UINT32, BASE_HEX,
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NULL, 0, NULL, HFILL } }
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2013-06-19 06:30:33 +00:00
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};
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static gint *ett[] = {
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2014-04-20 10:53:58 +00:00
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&ett_elmi,
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&ett_elmi_info_elem
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2013-06-19 06:30:33 +00:00
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};
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proto_elmi = proto_register_protocol(
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"Ethernet Local Management Interface", "E-LMI", "elmi");
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proto_register_field_array(proto_elmi, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_elmi(void)
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{
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dissector_handle_t elmi_handle;
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elmi_handle = new_create_dissector_handle(dissect_elmi, proto_elmi);
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dissector_add_uint("ethertype", ETHERTYPE_ELMI, elmi_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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