2 * Routines for MTP2 Peer Adaptation Layer dissection
3 * It is hopefully (needs testing) compliant to
4 * http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-06.txt
6 * Copyright 2001, 2002, Jeff Morriss <jeff.morriss[AT]ulticom.com>,
7 * updated by Michael Tuexen <michael.tuexen[AT]siemens.com>
9 * $Id: packet-m2pa.c,v 1.14 2002/09/22 12:12:32 tuexen Exp $
11 * Ethereal - Network traffic analyzer
12 * By Gerald Combs <gerald@ethereal.com>
13 * Copyright 1998 Gerald Combs
15 * Copied from packet-m3ua.c
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version 2
20 * of the License, or (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 #include <epan/packet.h>
39 #define NETWORK_BYTE_ORDER FALSE
40 #define SCTP_PORT_M2PA 3565
41 #define M2PA_PAYLOAD_PROTOCOL_ID 5
43 static int proto_m2pa = -1;
44 static int hf_version = -1;
45 static int hf_spare = -1;
46 static int hf_type = -1;
47 static int hf_class = -1;
48 static int hf_length = -1;
49 static int hf_unused = -1;
50 static int hf_bsn = -1;
51 static int hf_fsn = -1;
52 static int hf_status = -1;
53 static int hf_li_spare = -1;
54 static int hf_li_prio = -1;
55 static int hf_filler = -1;
56 static int hf_unknown_data = -1;
58 static gint ett_m2pa = -1;
59 static gint ett_m2pa_li = -1;
61 static int mtp3_proto_id;
62 static dissector_handle_t mtp3_handle;
64 #define VERSION_LENGTH 1
65 #define SPARE_LENGTH 1
66 #define CLASS_LENGTH 1
68 #define LENGTH_LENGTH 4
69 #define UNUSED_LENGTH 1
73 #define HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \
74 CLASS_LENGTH + TYPE_LENGTH + LENGTH_LENGTH + \
75 UNUSED_LENGTH + BSN_LENGTH + UNUSED_LENGTH + FSN_LENGTH)
77 #define HEADER_OFFSET 0
78 #define VERSION_OFFSET HEADER_OFFSET
79 #define SPARE_OFFSET (VERSION_OFFSET + VERSION_LENGTH)
80 #define CLASS_OFFSET (SPARE_OFFSET + SPARE_LENGTH)
81 #define TYPE_OFFSET (CLASS_OFFSET + CLASS_LENGTH)
82 #define LENGTH_OFFSET (TYPE_OFFSET + TYPE_LENGTH)
83 #define FIRST_UNUSED_OFFSET (LENGTH_OFFSET + LENGTH_LENGTH)
84 #define BSN_OFFSET (FIRST_UNUSED_OFFSET + UNUSED_LENGTH)
85 #define SECOND_UNUSED_OFFSET (BSN_OFFSET + BSN_LENGTH)
86 #define FSN_OFFSET (SECOND_UNUSED_OFFSET + UNUSED_LENGTH)
88 #define PROTOCOL_VERSION_RELEASE_1 1
90 static const value_string protocol_version_values[] = {
91 { PROTOCOL_VERSION_RELEASE_1, "Release 1" },
94 #define MESSAGE_CLASS_M2PA 0xb
96 static const value_string message_class_values[] = {
97 { MESSAGE_CLASS_M2PA, "M2PA" },
100 #define MESSAGE_TYPE_USER_DATA 0x1
101 #define MESSAGE_TYPE_LINK_STATUS 0x2
103 static const value_string message_type_values[] = {
104 { MESSAGE_TYPE_USER_DATA, "User Data" },
105 { MESSAGE_TYPE_LINK_STATUS, "Link Status" },
109 dissect_m2pa_header(tvbuff_t *header_tvb, proto_tree *m2pa_tree)
112 proto_tree_add_item(m2pa_tree, hf_version, header_tvb, VERSION_OFFSET, VERSION_LENGTH, NETWORK_BYTE_ORDER);
113 proto_tree_add_item(m2pa_tree, hf_spare, header_tvb, SPARE_OFFSET, SPARE_LENGTH, NETWORK_BYTE_ORDER);
114 proto_tree_add_item(m2pa_tree, hf_class, header_tvb, CLASS_OFFSET, CLASS_LENGTH, NETWORK_BYTE_ORDER);
115 proto_tree_add_item(m2pa_tree, hf_type, header_tvb, TYPE_OFFSET, TYPE_LENGTH, NETWORK_BYTE_ORDER);
116 proto_tree_add_item(m2pa_tree, hf_length, header_tvb, LENGTH_OFFSET, LENGTH_LENGTH, NETWORK_BYTE_ORDER);
117 proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, FIRST_UNUSED_OFFSET, UNUSED_LENGTH, NETWORK_BYTE_ORDER);
118 proto_tree_add_item(m2pa_tree, hf_bsn, header_tvb, BSN_OFFSET, BSN_LENGTH, NETWORK_BYTE_ORDER);
119 proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, SECOND_UNUSED_OFFSET, UNUSED_LENGTH, NETWORK_BYTE_ORDER);
120 proto_tree_add_item(m2pa_tree, hf_fsn, header_tvb, FSN_OFFSET, FSN_LENGTH, NETWORK_BYTE_ORDER);
126 #define MTP3_OFFSET (LI_OFFSET + LI_LENGTH)
127 #define LI_SPARE_MASK 0x3f
128 #define LI_PRIORITY_MASK 0xc0
131 dissect_m2pa_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
133 proto_item *m2pa_li_item;
134 proto_tree *m2pa_li_tree;
135 tvbuff_t *payload_tvb;
137 if (tvb_length(message_data_tvb) > 0) {
139 m2pa_li_item = proto_tree_add_text(m2pa_tree, message_data_tvb, LI_OFFSET, LI_LENGTH, "Length Indicator");
140 m2pa_li_tree = proto_item_add_subtree(m2pa_li_item, ett_m2pa_li);
141 proto_tree_add_item(m2pa_li_tree, hf_li_prio, message_data_tvb, LI_OFFSET, LI_LENGTH, NETWORK_BYTE_ORDER);
142 proto_tree_add_item(m2pa_li_tree, hf_li_spare, message_data_tvb, LI_OFFSET, LI_LENGTH, NETWORK_BYTE_ORDER);
143 /* Re-adjust length of M2PA item since it will be dissected as MTP3 */
144 proto_item_set_len(m2pa_item, HEADER_LENGTH + LI_LENGTH);
147 payload_tvb = tvb_new_subset(message_data_tvb, MTP3_OFFSET, -1, -1);
148 call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
149 if ((!(proto_is_protocol_enabled (mtp3_proto_id))) && (check_col(pinfo->cinfo, COL_INFO)))
150 col_append_str(pinfo->cinfo, COL_INFO, "User Data ");
152 if (check_col(pinfo->cinfo, COL_INFO))
153 col_append_str(pinfo->cinfo, COL_INFO, "User Data ");
157 #define STATUS_LENGTH 4
158 #define STATUS_OFFSET 0
159 #define FILLER_OFFSET (STATUS_OFFSET + STATUS_LENGTH)
161 #define STATUS_ALIGNMENT 1
162 #define STATUS_PROVING_NORMAL 2
163 #define STATUS_PROVING_EMERGENCY 3
164 #define STATUS_READY 4
165 #define STATUS_PROCESSOR_OUTAGE 5
166 #define STATUS_PROCESSOR_OUTAGE_ENDED 6
167 #define STATUS_BUSY 7
168 #define STATUS_BUSY_ENDED 8
169 #define STATUS_OUT_OF_SERVICE 9
171 static const value_string link_status_values[] = {
172 { STATUS_ALIGNMENT, "Alignment" },
173 { STATUS_PROVING_NORMAL, "Proving Normal" },
174 { STATUS_PROVING_EMERGENCY, "Proving Emergency" },
175 { STATUS_READY, "Ready" },
176 { STATUS_PROCESSOR_OUTAGE, "Processor Outage" },
177 { STATUS_PROCESSOR_OUTAGE_ENDED, "Processor Outage Ended" },
178 { STATUS_BUSY, "Busy" },
179 { STATUS_BUSY_ENDED, "Busy Ended" },
180 { STATUS_OUT_OF_SERVICE, "Out of Service" },
184 dissect_m2pa_link_status_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
186 guint16 filler_length;
188 if (check_col(pinfo->cinfo, COL_INFO))
189 col_append_str(pinfo->cinfo, COL_INFO, "Link status ");
191 filler_length = tvb_length(message_data_tvb) - STATUS_LENGTH;
192 proto_tree_add_item(m2pa_tree, hf_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, NETWORK_BYTE_ORDER);
193 if (filler_length > 0)
194 proto_tree_add_item(m2pa_tree, hf_filler, message_data_tvb, FILLER_OFFSET, filler_length, NETWORK_BYTE_ORDER);
199 dissect_m2pa_unknown_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
201 if (check_col(pinfo->cinfo, COL_INFO))
202 col_append_str(pinfo->cinfo, COL_INFO, "Unknown ");
204 proto_tree_add_item(m2pa_tree, hf_unknown_data, message_data_tvb, 0, tvb_length(message_data_tvb), NETWORK_BYTE_ORDER);
207 #define MESSAGE_DATA_OFFSET (HEADER_OFFSET + HEADER_LENGTH)
210 dissect_m2pa_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
212 guint32 message_data_length;
214 tvbuff_t *message_data_tvb;
216 message_data_length = tvb_get_ntohl(message_tvb, LENGTH_OFFSET) - HEADER_LENGTH;
217 message_data_tvb = tvb_new_subset(message_tvb, MESSAGE_DATA_OFFSET, message_data_length, message_data_length);
218 type = tvb_get_guint8(message_tvb, TYPE_OFFSET);
221 case MESSAGE_TYPE_USER_DATA:
222 dissect_m2pa_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree);
225 case MESSAGE_TYPE_LINK_STATUS:
226 dissect_m2pa_link_status_message(message_data_tvb, pinfo, m2pa_tree);
230 dissect_m2pa_unknown_message(message_data_tvb, pinfo, m2pa_tree);
235 dissect_m2pa_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
237 tvbuff_t *header_tvb;
239 header_tvb = tvb_new_subset(message_tvb, HEADER_OFFSET, HEADER_LENGTH, HEADER_LENGTH);
240 dissect_m2pa_header(header_tvb, m2pa_tree);
241 dissect_m2pa_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree);
245 dissect_m2pa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
247 proto_item *m2pa_item;
248 proto_tree *m2pa_tree;
250 if (check_col(pinfo->cinfo, COL_PROTOCOL))
251 col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA");
254 m2pa_item = proto_tree_add_item(tree, proto_m2pa, tvb, 0, -1, FALSE);
255 m2pa_tree = proto_item_add_subtree(m2pa_item, ett_m2pa);
261 dissect_m2pa_message(tvb, pinfo, m2pa_item, m2pa_tree, tree);
265 proto_register_m2pa(void)
267 static hf_register_info hf[] = {
268 { &hf_version, { "Version", "m2pa.version", FT_UINT8, BASE_DEC, VALS(protocol_version_values), 0x0, "", HFILL} },
269 { &hf_spare, { "Spare", "m2pa.spare", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL} },
270 { &hf_type, { "Message Type", "m2pa.type", FT_UINT8, BASE_DEC, VALS(message_type_values), 0x0, "", HFILL} },
271 { &hf_class, { "Message Class", "m2pa.class", FT_UINT8, BASE_DEC, VALS(message_class_values), 0x0, "", HFILL} },
272 { &hf_length, { "Message length", "m2pa.length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL} },
273 { &hf_unused, { "Unused", "m2pa.unused", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL} },
274 { &hf_bsn, { "BSN", "m2pa.bsn", FT_UINT24, BASE_DEC, NULL, 0x0, "", HFILL} },
275 { &hf_fsn, { "FSN", "m2pa.fsn", FT_UINT24, BASE_DEC, NULL, 0x0, "", HFILL} },
276 { &hf_li_spare, { "Spare", "m2pa.li_spare", FT_UINT8, BASE_HEX, NULL, LI_SPARE_MASK, "", HFILL} },
277 { &hf_li_prio, { "Priority", "m2pa.li_priority", FT_UINT8, BASE_HEX, NULL, LI_PRIORITY_MASK, "", HFILL} },
278 { &hf_status, { "Link Status", "m2pa.status", FT_UINT32, BASE_DEC, VALS(link_status_values), 0x0, "", HFILL} },
279 { &hf_filler, { "Filler", "m2pa.filler", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } },
280 { &hf_unknown_data, { "Unknown Data", "m2pa.unknown_data", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } }
283 static gint *ett[] = {
288 proto_m2pa = proto_register_protocol("MTP2 Peer Adaptation Layer", "M2PA", "m2pa");
290 proto_register_field_array(proto_m2pa, hf, array_length(hf));
291 proto_register_subtree_array(ett, array_length(ett));
295 proto_reg_handoff_m2pa(void)
297 dissector_handle_t m2pa_handle;
299 mtp3_handle = find_dissector("mtp3");
300 mtp3_proto_id = proto_get_id_by_filter_name("mtp3");
301 m2pa_handle = create_dissector_handle(dissect_m2pa, proto_m2pa);
302 dissector_add("sctp.ppi", M2PA_PAYLOAD_PROTOCOL_ID, m2pa_handle);
303 dissector_add("sctp.port", SCTP_PORT_M2PA, m2pa_handle);