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 <epan/packet.h>
32 #define RNGRSP_TIMING 1
33 #define RNGRSP_PWR_LEVEL_ADJ 2
34 #define RNGRSP_OFFSET_FREQ_ADJ 3
35 #define RNGRSP_TRANSMIT_EQ_ADJ 4
36 #define RNGRSP_RANGING_STATUS 5
37 #define RNGRSP_DOWN_FREQ_OVER 6
38 #define RNGRSP_UP_CHID_OVER 7
40 /* Initialize the protocol and registered fields */
41 static int proto_docsis_rngrsp = -1;
42 static int hf_docsis_rngrsp_upstream_chid = -1;
43 static int hf_docsis_rngrsp_sid = -1;
44 static int hf_docsis_rngrsp_timing_adj = -1;
45 static int hf_docsis_rngrsp_power_adj = -1;
46 static int hf_docsis_rngrsp_freq_adj = -1;
47 static int hf_docsis_rngrsp_xmit_eq_adj = -1;
48 static int hf_docsis_rngrsp_ranging_status = -1;
49 static int hf_docsis_rngrsp_down_freq_over = -1;
50 static int hf_docsis_rngrsp_upstream_ch_over = -1;
52 static const value_string rng_stat_vals[] = {
59 /* Initialize the subtree pointers */
60 static gint ett_docsis_rngrsp = -1;
62 /* Code to actually dissect the packets */
64 dissect_rngrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
67 proto_tree *rngrsp_tree;
68 guint8 tlvtype, tlvlen;
76 sid = tvb_get_ntohs (tvb, 0);
77 upchid = tvb_get_guint8 (tvb, 2);
79 col_clear (pinfo->cinfo, COL_INFO);
81 col_add_fstr (pinfo->cinfo, COL_INFO,
82 "Ranging Response: SID = %u, Upstream Channel = %u (U%u)",
83 sid, upchid, upchid - 1);
85 col_add_fstr (pinfo->cinfo, COL_INFO,
86 "Ranging Response: SID = %u, Telephony Return", sid);
92 proto_tree_add_protocol_format (tree, proto_docsis_rngrsp, tvb, 0, -1,
94 rngrsp_tree = proto_item_add_subtree (it, ett_docsis_rngrsp);
95 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_sid, tvb, 0, 2,
97 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_upstream_chid, tvb,
100 length = tvb_reported_length_remaining (tvb, 0);
104 tlvtype = tvb_get_guint8 (tvb, pos++);
105 tlvlen = tvb_get_guint8 (tvb, pos++);
111 tim = tvb_get_ntohl (tvb, pos);
112 proto_tree_add_int (rngrsp_tree,
113 hf_docsis_rngrsp_timing_adj, tvb, pos,
118 THROW (ReportedBoundsError);
121 case RNGRSP_PWR_LEVEL_ADJ:
124 pwr = tvb_get_guint8 (tvb, pos);
125 proto_tree_add_int (rngrsp_tree, hf_docsis_rngrsp_power_adj,
126 tvb, pos, tlvlen, pwr);
130 THROW (ReportedBoundsError);
133 case RNGRSP_OFFSET_FREQ_ADJ:
136 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_freq_adj,
137 tvb, pos, tlvlen, FALSE);
141 THROW (ReportedBoundsError);
144 case RNGRSP_TRANSMIT_EQ_ADJ:
145 proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_xmit_eq_adj,
146 tvb, pos, tlvlen, FALSE);
148 case RNGRSP_RANGING_STATUS:
150 proto_tree_add_item (rngrsp_tree,
151 hf_docsis_rngrsp_ranging_status, tvb,
155 THROW (ReportedBoundsError);
158 case RNGRSP_DOWN_FREQ_OVER:
160 proto_tree_add_item (rngrsp_tree,
161 hf_docsis_rngrsp_down_freq_over, tvb,
165 THROW (ReportedBoundsError);
168 case RNGRSP_UP_CHID_OVER:
170 proto_tree_add_item (rngrsp_tree,
171 hf_docsis_rngrsp_upstream_ch_over, tvb,
175 THROW (ReportedBoundsError);
179 } /* switch(tlvtype) */
181 } /* while (pos < length) */
188 /* Register the protocol with Wireshark */
190 /* this format is require because a script is used to build the C function
191 that calls all the protocol registration.
196 proto_register_docsis_rngrsp (void)
199 /* Setup list of header fields See Section 1.6.1 for details*/
200 static hf_register_info hf[] = {
201 {&hf_docsis_rngrsp_sid,
202 {"Service Identifier", "docsis_rngrsp.sid",
203 FT_UINT16, BASE_DEC, NULL, 0x0,
206 {&hf_docsis_rngrsp_upstream_chid,
207 {"Upstream Channel ID", "docsis_rngrsp.upchid",
208 FT_UINT8, BASE_DEC, NULL, 0x0,
211 {&hf_docsis_rngrsp_timing_adj,
212 {"Timing Adjust (6.25us/64)", "docsis_rngrsp.timingadj",
213 FT_INT32, BASE_DEC, NULL, 0x0,
214 "Timing Adjust", HFILL}
216 {&hf_docsis_rngrsp_power_adj,
217 {"Power Level Adjust (0.25dB units)", "docsis_rngrsp.poweradj",
218 FT_INT8, BASE_DEC, NULL, 0x0,
219 "Power Level Adjust", HFILL}
221 {&hf_docsis_rngrsp_freq_adj,
222 {"Offset Freq Adjust (Hz)", "docsis_rngrsp.freqadj",
223 FT_INT16, BASE_DEC, NULL, 0x0,
224 "Frequency Adjust", HFILL}
226 {&hf_docsis_rngrsp_xmit_eq_adj,
227 {"Transmit Equalisation Adjust", "docsis_rngrsp.xmit_eq_adj",
228 FT_BYTES, BASE_NONE, NULL, 0x0,
229 "Timing Equalisation Adjust", HFILL}
231 {&hf_docsis_rngrsp_ranging_status,
232 {"Ranging Status", "docsis_rngrsp.rng_stat",
233 FT_UINT8, BASE_DEC, VALS (rng_stat_vals), 0x0,
236 {&hf_docsis_rngrsp_down_freq_over,
237 {"Downstream Frequency Override (Hz)", "docsis_rngrsp.freq_over",
238 FT_UINT32, BASE_DEC, NULL, 0x0,
239 "Downstream Frequency Override", HFILL}
241 {&hf_docsis_rngrsp_upstream_ch_over,
242 {"Upstream Channel ID Override", "docsis_rngrsp.chid_override",
243 FT_UINT8, BASE_DEC, NULL, 0x0,
249 /* Setup protocol subtree array */
250 static gint *ett[] = {
254 /* Register the protocol name and description */
255 proto_docsis_rngrsp = proto_register_protocol ("DOCSIS Ranging Response",
259 /* Required function calls to register the header fields and subtrees used */
260 proto_register_field_array (proto_docsis_rngrsp, hf, array_length (hf));
261 proto_register_subtree_array (ett, array_length (ett));
263 register_dissector ("docsis_rngrsp", dissect_rngrsp, proto_docsis_rngrsp);
267 /* If this dissector uses sub-dissector registration add a registration routine.
268 This format is required because a script is used to find these routines and
269 create the code that calls these routines.
272 proto_reg_handoff_docsis_rngrsp (void)
274 dissector_handle_t docsis_rngrsp_handle;
276 docsis_rngrsp_handle = find_dissector ("docsis_rngrsp");
277 dissector_add_uint ("docsis_mgmt", 0x05, docsis_rngrsp_handle);