/* packet-rngrsp.c * Routines for Ranging Response Message dissection * Copyright 2002, Anand V. Narwani * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #define RNGRSP_TIMING 1 #define RNGRSP_PWR_LEVEL_ADJ 2 #define RNGRSP_OFFSET_FREQ_ADJ 3 #define RNGRSP_TRANSMIT_EQ_ADJ 4 #define RNGRSP_RANGING_STATUS 5 #define RNGRSP_DOWN_FREQ_OVER 6 #define RNGRSP_UP_CHID_OVER 7 /* Initialize the protocol and registered fields */ static int proto_docsis_rngrsp = -1; static int hf_docsis_rngrsp_upstream_chid = -1; static int hf_docsis_rngrsp_sid = -1; static int hf_docsis_rngrsp_timing_adj = -1; static int hf_docsis_rngrsp_power_adj = -1; static int hf_docsis_rngrsp_freq_adj = -1; static int hf_docsis_rngrsp_xmit_eq_adj = -1; static int hf_docsis_rngrsp_ranging_status = -1; static int hf_docsis_rngrsp_down_freq_over = -1; static int hf_docsis_rngrsp_upstream_ch_over = -1; static const value_string rng_stat_vals[] = { {1, "Continue"}, {2, "Abort"}, {3, "Success"}, {0, NULL} }; /* Initialize the subtree pointers */ static gint ett_docsis_rngrsp = -1; /* Code to actually dissect the packets */ static void dissect_rngrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree) { proto_item *it; proto_tree *rngrsp_tree; guint8 tlvtype, tlvlen; int pos; gint length; guint8 upchid; guint16 sid; gint8 pwr; gint32 tim; sid = tvb_get_ntohs (tvb, 0); upchid = tvb_get_guint8 (tvb, 2); col_clear (pinfo->cinfo, COL_INFO); if (upchid > 0) col_add_fstr (pinfo->cinfo, COL_INFO, "Ranging Response: SID = %u, Upstream Channel = %u (U%u)", sid, upchid, upchid - 1); else col_add_fstr (pinfo->cinfo, COL_INFO, "Ranging Response: SID = %u, Telephony Return", sid); if (tree) { it = proto_tree_add_protocol_format (tree, proto_docsis_rngrsp, tvb, 0, -1, "Ranging Response"); rngrsp_tree = proto_item_add_subtree (it, ett_docsis_rngrsp); proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_sid, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_upstream_chid, tvb, 2, 1, ENC_BIG_ENDIAN); length = tvb_reported_length_remaining (tvb, 0); pos = 3; while (pos < length) { tlvtype = tvb_get_guint8 (tvb, pos++); tlvlen = tvb_get_guint8 (tvb, pos++); switch (tlvtype) { case RNGRSP_TIMING: if (tlvlen == 4) { tim = tvb_get_ntohl (tvb, pos); proto_tree_add_int (rngrsp_tree, hf_docsis_rngrsp_timing_adj, tvb, pos, tlvlen, tim); } else { THROW (ReportedBoundsError); } break; case RNGRSP_PWR_LEVEL_ADJ: if (tlvlen == 1) { pwr = tvb_get_guint8 (tvb, pos); proto_tree_add_int (rngrsp_tree, hf_docsis_rngrsp_power_adj, tvb, pos, tlvlen, pwr); } else { THROW (ReportedBoundsError); } break; case RNGRSP_OFFSET_FREQ_ADJ: if (tlvlen == 2) { proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_freq_adj, tvb, pos, tlvlen, ENC_BIG_ENDIAN); } else { THROW (ReportedBoundsError); } break; case RNGRSP_TRANSMIT_EQ_ADJ: proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_xmit_eq_adj, tvb, pos, tlvlen, ENC_NA); break; case RNGRSP_RANGING_STATUS: if (tlvlen == 1) proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_ranging_status, tvb, pos, tlvlen, ENC_BIG_ENDIAN); else { THROW (ReportedBoundsError); } break; case RNGRSP_DOWN_FREQ_OVER: if (tlvlen == 4) proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_down_freq_over, tvb, pos, tlvlen, ENC_BIG_ENDIAN); else { THROW (ReportedBoundsError); } break; case RNGRSP_UP_CHID_OVER: if (tlvlen == 1) proto_tree_add_item (rngrsp_tree, hf_docsis_rngrsp_upstream_ch_over, tvb, pos, tlvlen, ENC_BIG_ENDIAN); else { THROW (ReportedBoundsError); } break; } /* switch(tlvtype) */ pos = pos + tlvlen; } /* while (pos < length) */ } /* if (tree) */ } /* Register the protocol with Wireshark */ /* this format is require because a script is used to build the C function that calls all the protocol registration. */ void proto_register_docsis_rngrsp (void) { /* Setup list of header fields See Section 1.6.1 for details*/ static hf_register_info hf[] = { {&hf_docsis_rngrsp_sid, {"Service Identifier", "docsis_rngrsp.sid", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL} }, {&hf_docsis_rngrsp_upstream_chid, {"Upstream Channel ID", "docsis_rngrsp.upchid", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL} }, {&hf_docsis_rngrsp_timing_adj, {"Timing Adjust (6.25us/64)", "docsis_rngrsp.timingadj", FT_INT32, BASE_DEC, NULL, 0x0, "Timing Adjust", HFILL} }, {&hf_docsis_rngrsp_power_adj, {"Power Level Adjust (0.25dB units)", "docsis_rngrsp.poweradj", FT_INT8, BASE_DEC, NULL, 0x0, "Power Level Adjust", HFILL} }, {&hf_docsis_rngrsp_freq_adj, {"Offset Freq Adjust (Hz)", "docsis_rngrsp.freqadj", FT_INT16, BASE_DEC, NULL, 0x0, "Frequency Adjust", HFILL} }, {&hf_docsis_rngrsp_xmit_eq_adj, {"Transmit Equalisation Adjust", "docsis_rngrsp.xmit_eq_adj", FT_BYTES, BASE_NONE, NULL, 0x0, "Timing Equalisation Adjust", HFILL} }, {&hf_docsis_rngrsp_ranging_status, {"Ranging Status", "docsis_rngrsp.rng_stat", FT_UINT8, BASE_DEC, VALS (rng_stat_vals), 0x0, NULL, HFILL} }, {&hf_docsis_rngrsp_down_freq_over, {"Downstream Frequency Override (Hz)", "docsis_rngrsp.freq_over", FT_UINT32, BASE_DEC, NULL, 0x0, "Downstream Frequency Override", HFILL} }, {&hf_docsis_rngrsp_upstream_ch_over, {"Upstream Channel ID Override", "docsis_rngrsp.chid_override", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL} }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_docsis_rngrsp, }; /* Register the protocol name and description */ proto_docsis_rngrsp = proto_register_protocol ("DOCSIS Ranging Response", "DOCSIS RNG-RSP", "docsis_rngrsp"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array (proto_docsis_rngrsp, hf, array_length (hf)); proto_register_subtree_array (ett, array_length (ett)); register_dissector ("docsis_rngrsp", dissect_rngrsp, proto_docsis_rngrsp); } /* If this dissector uses sub-dissector registration add a registration routine. This format is required because a script is used to find these routines and create the code that calls these routines. */ void proto_reg_handoff_docsis_rngrsp (void) { dissector_handle_t docsis_rngrsp_handle; docsis_rngrsp_handle = find_dissector ("docsis_rngrsp"); dissector_add_uint ("docsis_mgmt", 0x05, docsis_rngrsp_handle); }