2 * Routines for Ranging Response Message dissection
3 * Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #include "plugins/plugin_api.h"
31 #include "plugins/plugin_api_defs.h"
32 #include "moduleinfo.h"
40 #include <epan/packet.h>
42 #define RNGRSP_TIMING 1
43 #define RNGRSP_PWR_LEVEL_ADJ 2
44 #define RNGRSP_OFFSET_FREQ_ADJ 3
45 #define RNGRSP_TRANSMIT_EQ_ADJ 4
46 #define RNGRSP_RANGING_STATUS 5
47 #define RNGRSP_DOWN_FREQ_OVER 6
48 #define RNGRSP_UP_CHID_OVER 7
50 /* Initialize the protocol and registered fields */
51 static int proto_docsis_rngrsp = -1;
52 static int hf_docsis_rngrsp = -1;
53 static int hf_docsis_rngrsp_upstream_chid = -1;
54 static int hf_docsis_rngrsp_sid = -1;
55 static int hf_docsis_rngrsp_timing_adj = -1;
56 static int hf_docsis_rngrsp_power_adj = -1;
57 static int hf_docsis_rngrsp_freq_adj = -1;
58 static int hf_docsis_rngrsp_xmit_eq_adj = -1;
59 static int hf_docsis_rngrsp_ranging_status = -1;
60 static int hf_docsis_rngrsp_down_freq_over = -1;
61 static int hf_docsis_rngrsp_upstream_ch_over = -1;
63 static const value_string rng_stat_vals[] = {
70 /* Initialize the subtree pointers */
71 static gint ett_docsis_rngrsp = -1;
73 /* Code to actually dissect the packets */
75 dissect_rngrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
78 proto_tree *rngrsp_tree;
79 guint8 tlvtype, tlvlen;
87 sid = tvb_get_ntohs (tvb, 0);
88 upchid = tvb_get_guint8 (tvb, 2);
90 if (check_col (pinfo->cinfo, COL_INFO))
92 col_clear (pinfo->cinfo, COL_INFO);
94 col_add_fstr (pinfo->cinfo, COL_INFO,
95 "Ranging Response: SID = %u, Upstream Channel = %u (U%u)",
96 sid, upchid, upchid - 1);
98 col_add_fstr (pinfo->cinfo, COL_INFO,
99 "Ranging Response: SID = %u, Telephony Return", sid);
106 proto_tree_add_protocol_format (tree, proto_docsis_rngrsp, tvb, 0, -1,
108 rngrsp_tree = proto_item_add_subtree (it, ett_docsis_rngrsp);
109 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_sid, tvb, 0, 2,
111 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_upstream_chid, tvb,
114 length = tvb_reported_length_remaining (tvb, 0);
118 tlvtype = tvb_get_guint8 (tvb, pos++);
119 tlvlen = tvb_get_guint8 (tvb, pos++);
125 tim = tvb_get_ntohl (tvb, pos);
126 proto_tree_add_int (rngrsp_tree,
127 hf_docsis_rngrsp_timing_adj, tvb, pos,
132 THROW (ReportedBoundsError);
135 case RNGRSP_PWR_LEVEL_ADJ:
138 pwr = tvb_get_guint8 (tvb, pos);
139 proto_tree_add_int (rngrsp_tree, hf_docsis_rngrsp_power_adj,
140 tvb, pos, tlvlen, pwr);
144 THROW (ReportedBoundsError);
147 case RNGRSP_OFFSET_FREQ_ADJ:
150 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_freq_adj,
151 tvb, pos, tlvlen, FALSE);
155 THROW (ReportedBoundsError);
158 case RNGRSP_TRANSMIT_EQ_ADJ:
159 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_xmit_eq_adj,
160 tvb, pos, tlvlen, FALSE);
162 case RNGRSP_RANGING_STATUS:
164 proto_tree_add_item (rngrsp_tree,
165 hf_docsis_rngrsp_ranging_status, tvb,
169 THROW (ReportedBoundsError);
172 case RNGRSP_DOWN_FREQ_OVER:
174 proto_tree_add_item (rngrsp_tree,
175 hf_docsis_rngrsp_down_freq_over, tvb,
179 THROW (ReportedBoundsError);
182 case RNGRSP_UP_CHID_OVER:
184 proto_tree_add_item (rngrsp_tree,
185 hf_docsis_rngrsp_upstream_ch_over, tvb,
189 THROW (ReportedBoundsError);
193 } /* switch(tlvtype) */
195 } /* while (pos < length) */
202 /* Register the protocol with Ethereal */
204 /* this format is require because a script is used to build the C function
205 that calls all the protocol registration.
210 proto_register_docsis_rngrsp (void)
213 /* Setup list of header fields See Section 1.6.1 for details*/
214 static hf_register_info hf[] = {
216 {"RNG-RSP Message", "docsis.rngrsp",
217 FT_BYTES, BASE_HEX, NULL, 0x0,
218 "Ranging Response Message", HFILL}
220 {&hf_docsis_rngrsp_sid,
221 {"Service Identifier", "docsis.rngrsp.sid",
222 FT_UINT16, BASE_DEC, NULL, 0x0,
223 "Service Identifier", HFILL}
225 {&hf_docsis_rngrsp_upstream_chid,
226 {"Upstream Channel ID", "docsis.rngrsp.upchid",
227 FT_UINT8, BASE_DEC, NULL, 0x0,
228 "Upstream Channel ID", HFILL}
230 {&hf_docsis_rngrsp_timing_adj,
231 {"Timing Adjust (6.25us/64)", "docsis.rngrsp.timingadj",
232 FT_INT32, BASE_DEC, NULL, 0x0,
233 "Timing Adjust", HFILL}
235 {&hf_docsis_rngrsp_power_adj,
236 {"Power Level Adjust (0.25dB units)", "docsis.rngrsp.poweradj",
237 FT_INT8, BASE_DEC, NULL, 0x0,
238 "Power Level Adjust", HFILL}
240 {&hf_docsis_rngrsp_freq_adj,
241 {"Offset Freq Adjust (Hz)", "docsis.rngrsp.freqadj",
242 FT_INT16, BASE_DEC, NULL, 0x0,
243 "Frequency Adjust", HFILL}
245 {&hf_docsis_rngrsp_xmit_eq_adj,
246 {"Transmit Equalisation Adjust", "docsis.rngrsp.xmit_eq_adj",
247 FT_BYTES, BASE_HEX, NULL, 0x0,
248 "Timing Equalisation Adjust", HFILL}
250 {&hf_docsis_rngrsp_ranging_status,
251 {"Ranging Status", "docsis.rngrsp.rng_stat",
252 FT_UINT8, BASE_DEC, VALS (rng_stat_vals), 0x0,
253 "Ranging Status", HFILL}
255 {&hf_docsis_rngrsp_down_freq_over,
256 {"Downstream Frequency Override (Hz)", "docsis.rngrsp.freq_over",
257 FT_UINT32, BASE_DEC, NULL, 0x0,
258 "Downstream Frequency Override", HFILL}
260 {&hf_docsis_rngrsp_upstream_ch_over,
261 {"Upstream Channel ID Override", "docsis.rngrsp.chid_override",
262 FT_UINT8, BASE_DEC, NULL, 0x0,
263 "Upstream Channel ID Override", HFILL}
268 /* Setup protocol subtree array */
269 static gint *ett[] = {
273 /* Register the protocol name and description */
274 proto_docsis_rngrsp = proto_register_protocol ("DOCSIS Ranging Response",
278 /* Required function calls to register the header fields and subtrees used */
279 proto_register_field_array (proto_docsis_rngrsp, hf, array_length (hf));
280 proto_register_subtree_array (ett, array_length (ett));
282 register_dissector ("docsis_rngrsp", dissect_rngrsp, proto_docsis_rngrsp);
286 /* If this dissector uses sub-dissector registration add a registration routine.
287 This format is required because a script is used to find these routines and
288 create the code that calls these routines.
291 proto_reg_handoff_docsis_rngrsp (void)
293 dissector_handle_t docsis_rngrsp_handle;
295 docsis_rngrsp_handle = find_dissector ("docsis_rngrsp");
296 dissector_add ("docsis_mgmt", 0x05, docsis_rngrsp_handle);