2 * Routines for Ranging Response Message dissection
3 * Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
7 * Wireshark - Network traffic analyzer
8 * By Gerald Combs <gerald@wireshark.org>
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 "moduleinfo.h"
38 #include <epan/packet.h>
40 #define RNGRSP_TIMING 1
41 #define RNGRSP_PWR_LEVEL_ADJ 2
42 #define RNGRSP_OFFSET_FREQ_ADJ 3
43 #define RNGRSP_TRANSMIT_EQ_ADJ 4
44 #define RNGRSP_RANGING_STATUS 5
45 #define RNGRSP_DOWN_FREQ_OVER 6
46 #define RNGRSP_UP_CHID_OVER 7
48 /* Initialize the protocol and registered fields */
49 static int proto_docsis_rngrsp = -1;
50 static int hf_docsis_rngrsp = -1;
51 static int hf_docsis_rngrsp_upstream_chid = -1;
52 static int hf_docsis_rngrsp_sid = -1;
53 static int hf_docsis_rngrsp_timing_adj = -1;
54 static int hf_docsis_rngrsp_power_adj = -1;
55 static int hf_docsis_rngrsp_freq_adj = -1;
56 static int hf_docsis_rngrsp_xmit_eq_adj = -1;
57 static int hf_docsis_rngrsp_ranging_status = -1;
58 static int hf_docsis_rngrsp_down_freq_over = -1;
59 static int hf_docsis_rngrsp_upstream_ch_over = -1;
61 static const value_string rng_stat_vals[] = {
68 /* Initialize the subtree pointers */
69 static gint ett_docsis_rngrsp = -1;
71 /* Code to actually dissect the packets */
73 dissect_rngrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
76 proto_tree *rngrsp_tree;
77 guint8 tlvtype, tlvlen;
85 sid = tvb_get_ntohs (tvb, 0);
86 upchid = tvb_get_guint8 (tvb, 2);
88 if (check_col (pinfo->cinfo, COL_INFO))
90 col_clear (pinfo->cinfo, COL_INFO);
92 col_add_fstr (pinfo->cinfo, COL_INFO,
93 "Ranging Response: SID = %u, Upstream Channel = %u (U%u)",
94 sid, upchid, upchid - 1);
96 col_add_fstr (pinfo->cinfo, COL_INFO,
97 "Ranging Response: SID = %u, Telephony Return", sid);
104 proto_tree_add_protocol_format (tree, proto_docsis_rngrsp, tvb, 0, -1,
106 rngrsp_tree = proto_item_add_subtree (it, ett_docsis_rngrsp);
107 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_sid, tvb, 0, 2,
109 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_upstream_chid, tvb,
112 length = tvb_reported_length_remaining (tvb, 0);
116 tlvtype = tvb_get_guint8 (tvb, pos++);
117 tlvlen = tvb_get_guint8 (tvb, pos++);
123 tim = tvb_get_ntohl (tvb, pos);
124 proto_tree_add_int (rngrsp_tree,
125 hf_docsis_rngrsp_timing_adj, tvb, pos,
130 THROW (ReportedBoundsError);
133 case RNGRSP_PWR_LEVEL_ADJ:
136 pwr = tvb_get_guint8 (tvb, pos);
137 proto_tree_add_int (rngrsp_tree, hf_docsis_rngrsp_power_adj,
138 tvb, pos, tlvlen, pwr);
142 THROW (ReportedBoundsError);
145 case RNGRSP_OFFSET_FREQ_ADJ:
148 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_freq_adj,
149 tvb, pos, tlvlen, FALSE);
153 THROW (ReportedBoundsError);
156 case RNGRSP_TRANSMIT_EQ_ADJ:
157 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_xmit_eq_adj,
158 tvb, pos, tlvlen, FALSE);
160 case RNGRSP_RANGING_STATUS:
162 proto_tree_add_item (rngrsp_tree,
163 hf_docsis_rngrsp_ranging_status, tvb,
167 THROW (ReportedBoundsError);
170 case RNGRSP_DOWN_FREQ_OVER:
172 proto_tree_add_item (rngrsp_tree,
173 hf_docsis_rngrsp_down_freq_over, tvb,
177 THROW (ReportedBoundsError);
180 case RNGRSP_UP_CHID_OVER:
182 proto_tree_add_item (rngrsp_tree,
183 hf_docsis_rngrsp_upstream_ch_over, tvb,
187 THROW (ReportedBoundsError);
191 } /* switch(tlvtype) */
193 } /* while (pos < length) */
200 /* Register the protocol with Wireshark */
202 /* this format is require because a script is used to build the C function
203 that calls all the protocol registration.
208 proto_register_docsis_rngrsp (void)
211 /* Setup list of header fields See Section 1.6.1 for details*/
212 static hf_register_info hf[] = {
214 {"RNG-RSP Message", "docsis_rngrsp",
215 FT_BYTES, BASE_NONE, NULL, 0x0,
216 "Ranging Response Message", HFILL}
218 {&hf_docsis_rngrsp_sid,
219 {"Service Identifier", "docsis_rngrsp.sid",
220 FT_UINT16, BASE_DEC, NULL, 0x0,
223 {&hf_docsis_rngrsp_upstream_chid,
224 {"Upstream Channel ID", "docsis_rngrsp.upchid",
225 FT_UINT8, BASE_DEC, NULL, 0x0,
228 {&hf_docsis_rngrsp_timing_adj,
229 {"Timing Adjust (6.25us/64)", "docsis_rngrsp.timingadj",
230 FT_INT32, BASE_DEC, NULL, 0x0,
231 "Timing Adjust", HFILL}
233 {&hf_docsis_rngrsp_power_adj,
234 {"Power Level Adjust (0.25dB units)", "docsis_rngrsp.poweradj",
235 FT_INT8, BASE_DEC, NULL, 0x0,
236 "Power Level Adjust", HFILL}
238 {&hf_docsis_rngrsp_freq_adj,
239 {"Offset Freq Adjust (Hz)", "docsis_rngrsp.freqadj",
240 FT_INT16, BASE_DEC, NULL, 0x0,
241 "Frequency Adjust", HFILL}
243 {&hf_docsis_rngrsp_xmit_eq_adj,
244 {"Transmit Equalisation Adjust", "docsis_rngrsp.xmit_eq_adj",
245 FT_BYTES, BASE_NONE, NULL, 0x0,
246 "Timing Equalisation Adjust", HFILL}
248 {&hf_docsis_rngrsp_ranging_status,
249 {"Ranging Status", "docsis_rngrsp.rng_stat",
250 FT_UINT8, BASE_DEC, VALS (rng_stat_vals), 0x0,
253 {&hf_docsis_rngrsp_down_freq_over,
254 {"Downstream Frequency Override (Hz)", "docsis_rngrsp.freq_over",
255 FT_UINT32, BASE_DEC, NULL, 0x0,
256 "Downstream Frequency Override", HFILL}
258 {&hf_docsis_rngrsp_upstream_ch_over,
259 {"Upstream Channel ID Override", "docsis_rngrsp.chid_override",
260 FT_UINT8, BASE_DEC, NULL, 0x0,
266 /* Setup protocol subtree array */
267 static gint *ett[] = {
271 /* Register the protocol name and description */
272 proto_docsis_rngrsp = proto_register_protocol ("DOCSIS Ranging Response",
276 /* Required function calls to register the header fields and subtrees used */
277 proto_register_field_array (proto_docsis_rngrsp, hf, array_length (hf));
278 proto_register_subtree_array (ett, array_length (ett));
280 register_dissector ("docsis_rngrsp", dissect_rngrsp, proto_docsis_rngrsp);
284 /* If this dissector uses sub-dissector registration add a registration routine.
285 This format is required because a script is used to find these routines and
286 create the code that calls these routines.
289 proto_reg_handoff_docsis_rngrsp (void)
291 dissector_handle_t docsis_rngrsp_handle;
293 docsis_rngrsp_handle = find_dissector ("docsis_rngrsp");
294 dissector_add ("docsis_mgmt", 0x05, docsis_rngrsp_handle);