281 lines
7.8 KiB
C
281 lines
7.8 KiB
C
/* packet-rngrsp.c
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* Routines for Ranging Response Message dissection
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* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#define RNGRSP_TIMING 1
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#define RNGRSP_PWR_LEVEL_ADJ 2
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#define RNGRSP_OFFSET_FREQ_ADJ 3
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#define RNGRSP_TRANSMIT_EQ_ADJ 4
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#define RNGRSP_RANGING_STATUS 5
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#define RNGRSP_DOWN_FREQ_OVER 6
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#define RNGRSP_UP_CHID_OVER 7
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void proto_register_docsis_rngrsp(void);
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void proto_reg_handoff_docsis_rngrsp(void);
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/* Initialize the protocol and registered fields */
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static int proto_docsis_rngrsp = -1;
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static int hf_docsis_rngrsp_upstream_chid = -1;
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static int hf_docsis_rngrsp_sid = -1;
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static int hf_docsis_rngrsp_timing_adj = -1;
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static int hf_docsis_rngrsp_power_adj = -1;
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static int hf_docsis_rngrsp_freq_adj = -1;
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static int hf_docsis_rngrsp_xmit_eq_adj = -1;
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static int hf_docsis_rngrsp_ranging_status = -1;
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static int hf_docsis_rngrsp_down_freq_over = -1;
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static int hf_docsis_rngrsp_upstream_ch_over = -1;
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static const value_string rng_stat_vals[] = {
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{1, "Continue"},
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{2, "Abort"},
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{3, "Success"},
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{0, NULL}
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};
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/* Initialize the subtree pointers */
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static gint ett_docsis_rngrsp = -1;
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/* Code to actually dissect the packets */
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static void
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dissect_rngrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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proto_item *it;
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proto_tree *rngrsp_tree;
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guint8 tlvtype, tlvlen;
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int pos;
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gint length;
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guint8 upchid;
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guint16 sid;
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gint8 pwr;
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gint32 tim;
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sid = tvb_get_ntohs (tvb, 0);
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upchid = tvb_get_guint8 (tvb, 2);
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if (upchid > 0)
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col_add_fstr (pinfo->cinfo, COL_INFO,
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"Ranging Response: SID = %u, Upstream Channel = %u (U%u)",
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sid, upchid, upchid - 1);
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else
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col_add_fstr (pinfo->cinfo, COL_INFO,
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"Ranging Response: SID = %u, Telephony Return", sid);
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if (tree)
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{
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it =
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proto_tree_add_protocol_format (tree, proto_docsis_rngrsp, tvb, 0, -1,
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"Ranging Response");
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rngrsp_tree = proto_item_add_subtree (it, ett_docsis_rngrsp);
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proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_sid, tvb, 0, 2,
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ENC_BIG_ENDIAN);
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proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_upstream_chid, tvb,
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2, 1, ENC_BIG_ENDIAN);
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length = tvb_reported_length_remaining (tvb, 0);
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pos = 3;
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while (pos < length)
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{
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tlvtype = tvb_get_guint8 (tvb, pos++);
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tlvlen = tvb_get_guint8 (tvb, pos++);
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switch (tlvtype)
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{
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case RNGRSP_TIMING:
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if (tlvlen == 4)
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{
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tim = tvb_get_ntohl (tvb, pos);
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proto_tree_add_int (rngrsp_tree,
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hf_docsis_rngrsp_timing_adj, tvb, pos,
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tlvlen, tim);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case RNGRSP_PWR_LEVEL_ADJ:
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if (tlvlen == 1)
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{
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pwr = tvb_get_guint8 (tvb, pos);
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proto_tree_add_int (rngrsp_tree, hf_docsis_rngrsp_power_adj,
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tvb, pos, tlvlen, pwr);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case RNGRSP_OFFSET_FREQ_ADJ:
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if (tlvlen == 2)
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{
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proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_freq_adj,
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tvb, pos, tlvlen, ENC_BIG_ENDIAN);
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}
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case RNGRSP_TRANSMIT_EQ_ADJ:
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proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_xmit_eq_adj,
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tvb, pos, tlvlen, ENC_NA);
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break;
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case RNGRSP_RANGING_STATUS:
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if (tlvlen == 1)
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proto_tree_add_item (rngrsp_tree,
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hf_docsis_rngrsp_ranging_status, tvb,
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pos, tlvlen, ENC_BIG_ENDIAN);
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case RNGRSP_DOWN_FREQ_OVER:
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if (tlvlen == 4)
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proto_tree_add_item (rngrsp_tree,
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hf_docsis_rngrsp_down_freq_over, tvb,
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pos, tlvlen, ENC_BIG_ENDIAN);
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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case RNGRSP_UP_CHID_OVER:
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if (tlvlen == 1)
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proto_tree_add_item (rngrsp_tree,
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hf_docsis_rngrsp_upstream_ch_over, tvb,
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pos, tlvlen, ENC_BIG_ENDIAN);
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else
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{
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THROW (ReportedBoundsError);
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}
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break;
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} /* switch(tlvtype) */
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pos = pos + tlvlen;
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} /* while (pos < length) */
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} /* if (tree) */
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}
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/* Register the protocol with Wireshark */
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_docsis_rngrsp (void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{&hf_docsis_rngrsp_sid,
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{"Service Identifier", "docsis_rngrsp.sid",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_rngrsp_upstream_chid,
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{"Upstream Channel ID", "docsis_rngrsp.upchid",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_rngrsp_timing_adj,
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{"Timing Adjust (6.25us/64)", "docsis_rngrsp.timingadj",
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FT_INT32, BASE_DEC, NULL, 0x0,
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"Timing Adjust", HFILL}
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},
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{&hf_docsis_rngrsp_power_adj,
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{"Power Level Adjust (0.25dB units)", "docsis_rngrsp.poweradj",
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FT_INT8, BASE_DEC, NULL, 0x0,
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"Power Level Adjust", HFILL}
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},
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{&hf_docsis_rngrsp_freq_adj,
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{"Offset Freq Adjust (Hz)", "docsis_rngrsp.freqadj",
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FT_INT16, BASE_DEC, NULL, 0x0,
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"Frequency Adjust", HFILL}
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},
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{&hf_docsis_rngrsp_xmit_eq_adj,
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{"Transmit Equalisation Adjust", "docsis_rngrsp.xmit_eq_adj",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Timing Equalisation Adjust", HFILL}
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},
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{&hf_docsis_rngrsp_ranging_status,
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{"Ranging Status", "docsis_rngrsp.rng_stat",
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FT_UINT8, BASE_DEC, VALS (rng_stat_vals), 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_rngrsp_down_freq_over,
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{"Downstream Frequency Override (Hz)", "docsis_rngrsp.freq_over",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Downstream Frequency Override", HFILL}
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},
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{&hf_docsis_rngrsp_upstream_ch_over,
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{"Upstream Channel ID Override", "docsis_rngrsp.chid_override",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL}
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_docsis_rngrsp,
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};
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/* Register the protocol name and description */
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proto_docsis_rngrsp = proto_register_protocol ("DOCSIS Ranging Response",
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"DOCSIS RNG-RSP",
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"docsis_rngrsp");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array (proto_docsis_rngrsp, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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register_dissector ("docsis_rngrsp", dissect_rngrsp, proto_docsis_rngrsp);
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_docsis_rngrsp (void)
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{
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dissector_handle_t docsis_rngrsp_handle;
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docsis_rngrsp_handle = find_dissector ("docsis_rngrsp");
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dissector_add_uint ("docsis_mgmt", 0x05, docsis_rngrsp_handle);
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}
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