2 * Routines for MTP2 dissection
3 * It is hopefully (needs testing) compliant to
6 * Copyright 2001, Michael Tuexen <michael.tuexen[AT]icn.siemens.de>
8 * $Id: packet-mtp2.c,v 1.1 2001/12/11 03:04:26 gram Exp $
10 * Ethereal - Network traffic analyzer
11 * By Gerald Combs <gerald@ethereal.com>
12 * Copyright 1998 Gerald Combs
14 * Copied from packet-m2pa.c
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version 2
19 * of the License, or (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
39 /* Initialize the protocol and registered fields */
40 static int proto_mtp2 = -1;
41 static int hf_mtp2_bsn = -1;
42 static int hf_mtp2_bib = -1;
43 static int hf_mtp2_fsn = -1;
44 static int hf_mtp2_fib = -1;
45 static int hf_mtp2_li = -1;
46 static int hf_mtp2_spare = -1;
47 static int hf_mtp2_sf = -1;
48 static int hf_mtp2_long_sf = -1;
50 /* Initialize the subtree pointers */
51 static gint ett_mtp2 = -1;
53 static dissector_handle_t mtp3_handle;
54 static int mtp3_proto_id;
56 #define BSN_BIB_LENGTH 1
57 #define FSN_FIB_LENGTH 1
59 #define HEADER_LENGTH (BSN_BIB_LENGTH + FSN_FIB_LENGTH + LI_LENGTH)
61 #define LONG_SF_LENGTH 2
63 #define BSN_BIB_OFFSET 0
64 #define FSN_FIB_OFFSET (BSN_BIB_OFFSET + BSN_BIB_LENGTH)
65 #define LI_OFFSET (FSN_FIB_OFFSET + FSN_FIB_LENGTH)
66 #define SIO_OFFSET (LI_OFFSET + LI_LENGTH)
67 #define SF_OFFSET (LI_OFFSET + LI_LENGTH)
74 #define SPARE_MASK 0xc0
83 static const value_string status_field_vals[] = {
84 { STATUS_O, "Status Indication O" },
85 { STATUS_N, "Status Indication N" },
86 { STATUS_E, "Status Indication E" },
87 { STATUS_OS, "Status Indication OS" },
88 { STATUS_PO, "Status Indication PO" },
89 { STATUS_B, "Status Indication BO" },
94 dissect_mtp2_header(tvbuff_t *su_tvb, proto_item *mtp2_tree)
96 guint8 bsn_bib, fsn_fib, li;
98 bsn_bib = tvb_get_guint8(su_tvb, BSN_BIB_OFFSET);
99 fsn_fib = tvb_get_guint8(su_tvb, FSN_FIB_OFFSET);
100 li = tvb_get_guint8(su_tvb, LI_OFFSET);
103 proto_tree_add_uint(mtp2_tree, hf_mtp2_bsn, su_tvb, BSN_BIB_OFFSET, BSN_BIB_LENGTH, bsn_bib);
104 proto_tree_add_uint(mtp2_tree, hf_mtp2_bib, su_tvb, BSN_BIB_OFFSET, BSN_BIB_LENGTH, bsn_bib);
105 proto_tree_add_uint(mtp2_tree, hf_mtp2_fsn, su_tvb, FSN_FIB_OFFSET, FSN_FIB_LENGTH, fsn_fib);
106 proto_tree_add_uint(mtp2_tree, hf_mtp2_fib, su_tvb, FSN_FIB_OFFSET, FSN_FIB_LENGTH, fsn_fib);
107 proto_tree_add_uint(mtp2_tree, hf_mtp2_li, su_tvb, LI_OFFSET, LI_LENGTH, li);
108 proto_tree_add_uint(mtp2_tree, hf_mtp2_spare, su_tvb, LI_OFFSET, LI_LENGTH, li);
113 dissect_mtp2_fisu(packet_info *pinfo)
115 if (check_col(pinfo->cinfo, COL_INFO))
116 col_append_str(pinfo->cinfo, COL_INFO, "FISU");
120 dissect_mtp2_lssu(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_tree)
125 if (check_col(pinfo->cinfo, COL_INFO))
126 col_append_str(pinfo->cinfo, COL_INFO, "LSSU");
129 li = tvb_get_guint8(su_tvb, LI_OFFSET);
130 if ((li & LI_MASK) == 1) {
131 sf = tvb_get_guint8(su_tvb, SF_OFFSET);
132 proto_tree_add_uint(mtp2_tree, hf_mtp2_sf, su_tvb, SF_OFFSET, SF_LENGTH, sf);
134 long_sf = tvb_get_letohs(su_tvb, SF_OFFSET);
135 proto_tree_add_uint(mtp2_tree, hf_mtp2_long_sf, su_tvb, SF_OFFSET, LONG_SF_LENGTH, long_sf);
141 dissect_mtp2_msu(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_item, proto_item *tree)
144 tvbuff_t *sif_sio_tvb;
146 if ((check_col(pinfo->cinfo, COL_INFO)) && (!proto_is_protocol_enabled(mtp3_proto_id)))
147 col_append_str(pinfo->cinfo, COL_INFO, "MSU");
149 sif_sio_length = tvb_length(su_tvb) - HEADER_LENGTH;
150 sif_sio_tvb = tvb_new_subset(su_tvb, SIO_OFFSET, sif_sio_length, sif_sio_length);
151 call_dissector(mtp3_handle, sif_sio_tvb, pinfo, tree);
154 proto_item_set_len(mtp2_item, HEADER_LENGTH);
159 dissect_mtp2_su(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_item, proto_item *mtp2_tree, proto_tree *tree)
163 dissect_mtp2_header(su_tvb, mtp2_tree);
164 li = tvb_get_guint8(su_tvb, LI_OFFSET);
165 switch(li & LI_MASK) {
167 dissect_mtp2_fisu(pinfo);
171 dissect_mtp2_lssu(su_tvb, pinfo, mtp2_tree);
174 dissect_mtp2_msu(su_tvb, pinfo, mtp2_item, tree);
180 dissect_mtp2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
182 proto_item *mtp2_item = NULL;
183 proto_tree *mtp2_tree = NULL;
185 if (check_col(pinfo->cinfo, COL_PROTOCOL))
186 col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP2");
189 mtp2_item = proto_tree_add_item(tree, proto_mtp2, tvb, 0, tvb_length(tvb), FALSE);
190 mtp2_tree = proto_item_add_subtree(mtp2_item, ett_mtp2);
193 dissect_mtp2_su(tvb, pinfo, mtp2_item, mtp2_tree, tree);
197 proto_register_mtp2(void)
200 static hf_register_info hf[] = {
202 { "Backward sequence number", "mtp2.bsn",
203 FT_UINT8, BASE_DEC, NULL, BSN_MASK,
207 { "Backward indicator bit", "mtp2.bib",
208 FT_UINT8, BASE_DEC, NULL, BIB_MASK,
212 { "Forward sequence number", "mtp2.fsn",
213 FT_UINT8, BASE_DEC, NULL, FSN_MASK,
217 { "Forward indicator bit", "mtp2.fib",
218 FT_UINT8, BASE_DEC, NULL, FIB_MASK,
222 { "Length Indicator", "mtp2.li",
223 FT_UINT8, BASE_DEC, NULL, LI_MASK,
227 { "Spare", "mtp2.spare",
228 FT_UINT8, BASE_DEC, NULL, SPARE_MASK,
232 { "Status field", "mtp2.sf",
233 FT_UINT8, BASE_DEC, VALS(status_field_vals), 0x0,
237 { "Status field", "mtp2.long_sf",
238 FT_UINT16, BASE_HEX, NULL, 0x0,
243 static gint *ett[] = {
247 proto_mtp2 = proto_register_protocol("Message Transfer Part Level 2", "MTP2", "mtp2");
248 register_dissector("mtp2", dissect_mtp2, proto_mtp2);
250 proto_register_field_array(proto_mtp2, hf, array_length(hf));
251 proto_register_subtree_array(ett, array_length(ett));
256 proto_reg_handoff_mtp2(void)
258 mtp3_handle = find_dissector("mtp3");
259 mtp3_proto_id = proto_get_id_by_filter_name("mtp3");