forked from osmocom/wireshark
401 lines
14 KiB
C
401 lines
14 KiB
C
/* packet-dpd.c
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* Routines for DOCSIS 3.1 Downstream Profile Descriptor dissection.
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* Copyright 2016, Bruno Verstuyft <bruno.verstuyft@excentis.com>
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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/expert.h>
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#define SUBCARRIER_ASSIGNMENT_RANGE_LIST 5
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#define SUBCARRIER_ASSIGNMENT_VECTOR 6
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#define SUBCARRIER_ASSIGNMENT_RANGE_CONT 0
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#define SUBCARRIER_ASSIGNMENT_RANGE_SKIPBY1 1
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#define SUBCARRIER_ASSIGNMENT_LIST 2
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void proto_register_docsis_dpd(void);
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void proto_reg_handoff_docsis_dpd(void);
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/* Initialize the protocol and registered fields */
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static int proto_docsis_dpd = -1;
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static int hf_docsis_dpd_tlv_unknown = -1;
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static int hf_docsis_dpd_dschid = -1;
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static int hf_docsis_dpd_prof_id = -1;
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static int hf_docsis_dpd_ccc = -1;
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static int hf_docsis_dpd_tlv_subc_assign_type = -1;
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static int hf_docsis_dpd_tlv_subc_assign_value = -1;
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static int hf_docsis_dpd_subc_assign_range = -1;
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static int hf_docsis_dpd_tlv_subc_assign_reserved = -1;
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static int hf_docsis_dpd_tlv_subc_assign_modulation = -1;
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static int hf_docsis_dpd_subc_assign_index = -1;
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static int hf_docsis_dpd_tlv_subc_assign_vector_oddness = -1;
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static int hf_docsis_dpd_tlv_subc_assign_vector_reserved = -1;
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static int hf_docsis_dpd_tlv_subc_assign_vector_subc_start = -1;
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static int hf_docsis_dpd_tlv_subc_assign_vector_modulation_odd = -1;
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static int hf_docsis_dpd_tlv_subc_assign_vector_modulation_even = -1;
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static int hf_docsis_dpd_tlv_data = -1;
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static int hf_docsis_dpd_type = -1;
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static int hf_docsis_dpd_length = -1;
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static expert_field ei_docsis_dpd_tlvlen_bad = EI_INIT;
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static expert_field ei_docsis_dpd_value_unknown = EI_INIT;
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/* Initialize the subtree pointers */
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static gint ett_docsis_dpd = -1;
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static gint ett_docsis_dpd_tlv = -1;
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static gint ett_docsis_dpd_tlvtlv = -1;
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static gint ett_docsis_dpd_tlv_subcarrier_assignment = -1;
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static gint ett_docsis_dpd_tlv_subcarrier_assignment_vector = -1;
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static dissector_handle_t docsis_dpd_handle;
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/*BASE_CUSTOM function for subcarrier range*/
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static void
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subc_assign_range(
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char *buf,
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guint32 value)
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{
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g_snprintf(buf, ITEM_LABEL_LENGTH,
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"%u - %u",
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value >> 16, value &0xFFFF);
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}
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static const value_string docsis_dpd_subc_assign_type_str[] = {
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{0, "range, continuous"},
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{1, "range, skip by 1"},
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{2, "list"},
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{3, "reserved"},
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{0, NULL}
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};
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static const value_string docsis_dpd_subc_assign_value_str[] = {
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{0, "specific value"},
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{1, "default value"},
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{0, NULL}
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};
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static const value_string docsis_dpd_subc_assign_modulation_str[] = {
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{0, "zero-bit loaded"},
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{1, "reserved"},
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{2, "QPSK (for NPC profile only)"},
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{3, "reserved"},
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{4, "16-QAM"},
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{5, "reserved"},
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{6, "64-QAM"},
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{7, "128-QAM"},
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{8, "256-QAM"},
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{9, "512-QAM"},
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{10, "1024-QAM"},
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{11, "2048-QAM"},
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{12, "4096-QAM"},
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{13, "8192-QAM"},
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{14, "16384-QAM"},
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{15, "reserved"},
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{0, NULL}
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};
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static const value_string docsis_dpd_tlv_subc_assign_vector_oddness_str[] = {
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{0, "N is even"},
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{1, "N is odd"},
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{0, NULL}
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};
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static const value_string docsis_dpd_tlv_subc_assign_vector_modulation_str[] = {
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{0, "zero-bit loaded"},
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{1, "continuous pilot"},
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{2, "QPSK (for NPC profile only)"},
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{3, "reserved"},
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{4, "16-QAM"},
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{5, "reserved"},
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{6, "64-QAM"},
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{7, "128-QAM"},
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{8, "256-QAM"},
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{9, "512-QAM"},
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{10, "1024-QAM"},
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{11, "2048-QAM"},
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{12, "4096-QAM"},
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{13, "8192-QAM"},
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{14, "16384-QAM"},
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{15, "reserved"},
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{0, NULL}
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};
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static const value_string dpd_tlv_vals[] = {
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{SUBCARRIER_ASSIGNMENT_RANGE_LIST, "Subcarrier Assignment Range/List"},
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{SUBCARRIER_ASSIGNMENT_VECTOR, "Subcarrier Assignment Vector"},
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{0, NULL}
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};
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/* Dissection */
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static void
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dissect_dpd_subcarrier_assignment_range_list(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, guint pos, guint len)
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{
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guint32 i, subcarrier_assignment_type;
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proto_item* type_item;
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type_item = proto_tree_add_item_ret_uint (tree, hf_docsis_dpd_tlv_subc_assign_type, tvb, pos, 1, ENC_BIG_ENDIAN, &subcarrier_assignment_type);
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_value, tvb, pos, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_reserved, tvb, pos, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_modulation, tvb, pos, 1, ENC_BIG_ENDIAN);
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pos++;
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switch (subcarrier_assignment_type)
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{
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case SUBCARRIER_ASSIGNMENT_RANGE_CONT:
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case SUBCARRIER_ASSIGNMENT_RANGE_SKIPBY1:
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proto_tree_add_item (tree, hf_docsis_dpd_subc_assign_range, tvb, pos, 4, ENC_BIG_ENDIAN);
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break;
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case SUBCARRIER_ASSIGNMENT_LIST:
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for (i = 0; i < len/2; ++i) {
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proto_tree_add_item (tree, hf_docsis_dpd_subc_assign_index, tvb, pos, 2, ENC_BIG_ENDIAN);
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pos += 2;
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}
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break;
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default:
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expert_add_info_format(pinfo, type_item, &ei_docsis_dpd_value_unknown, "Unknown subcarrier assignment type: %u", subcarrier_assignment_type);
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break;
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}
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}
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static void
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dissect_dpd_subcarrier_assignment_vector(tvbuff_t * tvb, proto_tree * tree, guint start, guint len)
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{
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guint32 subcarrier_assignment_vector_oddness;
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guint vector_index;
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proto_tree_add_item_ret_uint (tree, hf_docsis_dpd_tlv_subc_assign_vector_oddness, tvb, start, 1, ENC_BIG_ENDIAN, &subcarrier_assignment_vector_oddness);
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_vector_reserved, tvb, start, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_vector_subc_start, tvb, start, 2, ENC_BIG_ENDIAN);
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for(vector_index = 0; vector_index < len; ++vector_index)
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{
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_vector_modulation_odd, tvb, start + 2 + vector_index, 1, ENC_BIG_ENDIAN);
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if (!((vector_index == len -1) && subcarrier_assignment_vector_oddness))
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{
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proto_tree_add_item (tree, hf_docsis_dpd_tlv_subc_assign_vector_modulation_even, tvb, start + 2 + vector_index, 1, ENC_BIG_ENDIAN);
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}
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}
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}
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static void
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dissect_dpd_tlv (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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proto_item *it, *tlv_item, *tlv_len_item;
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proto_tree *tlv_tree;
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guint pos = 0;
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guint length;
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guint8 type;
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it = proto_tree_add_item(tree, hf_docsis_dpd_tlv_data, tvb, 0, tvb_reported_length(tvb), ENC_NA);
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tlv_tree = proto_item_add_subtree (it, ett_docsis_dpd_tlv);
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while (tvb_reported_length_remaining(tvb, pos) > 0)
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{
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type = tvb_get_guint8 (tvb, pos);
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tlv_tree = proto_tree_add_subtree(tlv_tree, tvb, pos, -1,
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ett_docsis_dpd_tlvtlv, &tlv_item,
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val_to_str(type, dpd_tlv_vals,
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"Unknown TLV (%u)"));
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proto_tree_add_uint (tlv_tree, hf_docsis_dpd_type, tvb, pos, 1, type);
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pos++;
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if (type != SUBCARRIER_ASSIGNMENT_VECTOR)
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{
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tlv_len_item = proto_tree_add_item_ret_uint (tlv_tree, hf_docsis_dpd_length, tvb, pos, 1, ENC_NA, &length);
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pos++;
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proto_item_set_len(tlv_item, length + 2);
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}
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switch (type)
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{
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case SUBCARRIER_ASSIGNMENT_RANGE_LIST:
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if (length >= 5)
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{
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dissect_dpd_subcarrier_assignment_range_list(tvb, pinfo, tlv_tree, pos, length);
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}
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else
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{
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expert_add_info_format(pinfo, tlv_len_item, &ei_docsis_dpd_tlvlen_bad, "Wrong TLV length: %u", length);
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}
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break;
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case SUBCARRIER_ASSIGNMENT_VECTOR:
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/*FOR THIS TYPE, LENGTH IS 2 BYTES INSTEAD OF 1 */
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tlv_len_item = proto_tree_add_item_ret_uint (tlv_tree, hf_docsis_dpd_length, tvb, pos, 2, ENC_BIG_ENDIAN, &length);
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pos += 2;
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proto_item_set_len(tlv_item, length + 2);
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if (length >=2)
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{
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dissect_dpd_subcarrier_assignment_vector(tvb, tlv_tree, pos, length);
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}
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else
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{
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expert_add_info_format(pinfo, tlv_len_item, &ei_docsis_dpd_tlvlen_bad, "Wrong TLV length: %u", length);
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}
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break;
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default:
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proto_tree_add_item (tlv_tree, hf_docsis_dpd_tlv_unknown, tvb, pos - 2, length+2, ENC_NA);
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expert_add_info_format(pinfo, tlv_item, &ei_docsis_dpd_value_unknown, "Unknown TLV: %u", type);
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break;
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} /* switch */
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pos += length;
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} /* while */
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}
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static int
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dissect_dpd (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
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{
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proto_item *it;
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proto_tree *dpd_tree;
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tvbuff_t *next_tvb;
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guint32 downstream_channel_id, profile_identifier, configuration_change_count;
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it = proto_tree_add_item(tree, proto_docsis_dpd, tvb, 0, -1, ENC_NA);
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dpd_tree = proto_item_add_subtree (it, ett_docsis_dpd);
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proto_tree_add_item_ret_uint (dpd_tree, hf_docsis_dpd_dschid, tvb, 0, 1, ENC_BIG_ENDIAN, &downstream_channel_id);
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proto_tree_add_item_ret_uint (dpd_tree, hf_docsis_dpd_prof_id, tvb, 1, 1, ENC_BIG_ENDIAN, &profile_identifier);
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proto_tree_add_item_ret_uint (dpd_tree, hf_docsis_dpd_ccc, tvb, 2, 1, ENC_BIG_ENDIAN, &configuration_change_count);
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col_add_fstr (pinfo->cinfo, COL_INFO, "DPD: DS CH ID: %u, Profile ID: %u, CCC: %u", downstream_channel_id, profile_identifier, configuration_change_count);
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/* Call Dissector TLV's */
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next_tvb = tvb_new_subset_remaining(tvb, 3);
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dissect_dpd_tlv(next_tvb, pinfo, dpd_tree);
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return tvb_captured_length(tvb);
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_docsis_dpd(void)
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{
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static hf_register_info hf[] = {
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{&hf_docsis_dpd_tlv_unknown,
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{"Unknown TLV", "docsis_dpd.unknown_tlv",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL}
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},
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{&hf_docsis_dpd_dschid,
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{"Downstream Channel ID", "docsis_dpd.dschid", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
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},
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{&hf_docsis_dpd_prof_id,
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{"Profile Identifier", "docsis_dpd.prof_id", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
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},
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{&hf_docsis_dpd_ccc,
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{"Configuration Change Count", "docsis_dpd.ccc", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_type,
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{"Subcarrier Assignment Type", "docsis_dpd.tlv.subc_assign.type", FT_UINT8, BASE_DEC, VALS(docsis_dpd_subc_assign_type_str), 0xC0, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_value,
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{"Subcarrier Assignment Value", "docsis_dpd.tlv.subc_assign.value", FT_UINT8, BASE_DEC, VALS(docsis_dpd_subc_assign_value_str), 0x20, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_reserved,
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{"reserved", "docsis_dpd.tlv.subc_assign.reserved", FT_UINT8, BASE_DEC, NULL, 0x10, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_modulation,
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{"Subcarrier Assignment Modulation", "docsis_dpd.tlv.subc_assign.modulation", FT_UINT8, BASE_DEC, VALS(docsis_dpd_subc_assign_modulation_str), 0x0F, NULL, HFILL}
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},
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{&hf_docsis_dpd_subc_assign_range,
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{"Subcarrier index range", "docsis_dpd.tlv.subc_assign.range", FT_UINT32, BASE_CUSTOM, CF_FUNC(subc_assign_range), 0x00, NULL, HFILL}
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},
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{&hf_docsis_dpd_subc_assign_index,
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{"Subcarrier index", "docsis_dpd.tlv.subc_assign.index", FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_vector_oddness,
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{"Odd or even", "docsis_dpd.tlv.subc_assign_vect.oddness", FT_UINT8, BASE_DEC, VALS(docsis_dpd_tlv_subc_assign_vector_oddness_str), 0x80, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_vector_reserved,
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{"Reserved", "docsis_dpd.tlv.subc_assign_vect.reserved", FT_UINT8, BASE_DEC, NULL, 0x60, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_vector_subc_start,
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{"Subcarrier start", "docsis_dpd.tlv.subc_assign_vect.subc_start", FT_UINT16, BASE_DEC, NULL, 0x1FFF, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_vector_modulation_odd,
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{"Modulation", "docsis_dpd.tlv.subc_assign_vect.modulation", FT_UINT8, BASE_DEC, VALS(docsis_dpd_tlv_subc_assign_vector_modulation_str), 0xF0, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_subc_assign_vector_modulation_even,
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{"Modulation", "docsis_dpd.tlv.subc_assign_vect.modulation", FT_UINT8, BASE_DEC, VALS(docsis_dpd_tlv_subc_assign_vector_modulation_str), 0x0F, NULL, HFILL}
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},
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{&hf_docsis_dpd_tlv_data,
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{"TLV Data", "docsis_dpd.tlv_data", FT_BYTES, BASE_NO_DISPLAY_VALUE, NULL, 0x0, NULL, HFILL}
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},
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{&hf_docsis_dpd_type,
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{"Type", "docsis_dpd.type",FT_UINT8, BASE_DEC, VALS(dpd_tlv_vals), 0x0, NULL, HFILL}
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},
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{&hf_docsis_dpd_length,
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{"Length", "docsis_dpd.length",FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL}
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},
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};
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static ei_register_info ei[] = {
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{&ei_docsis_dpd_tlvlen_bad, { "docsis_dpd.tlvlenbad", PI_MALFORMED, PI_ERROR, "Bad TLV length", EXPFILL}},
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{&ei_docsis_dpd_value_unknown, { "docsis_dpd.valueunknown", PI_PROTOCOL, PI_WARN, "Unknown value", EXPFILL}}
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};
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static gint *ett[] = {
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&ett_docsis_dpd,
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&ett_docsis_dpd_tlv,
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&ett_docsis_dpd_tlvtlv,
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&ett_docsis_dpd_tlv_subcarrier_assignment,
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&ett_docsis_dpd_tlv_subcarrier_assignment_vector
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};
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expert_module_t* expert_docsis_dpd;
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proto_docsis_dpd = proto_register_protocol ("DOCSIS Downstream Profile Descriptor", "DOCSIS DPD", "docsis_dpd");
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proto_register_field_array (proto_docsis_dpd, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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expert_docsis_dpd = expert_register_protocol(proto_docsis_dpd);
|
|
expert_register_field_array(expert_docsis_dpd, ei, array_length(ei));
|
|
docsis_dpd_handle = register_dissector ("docsis_dpd", dissect_dpd, proto_docsis_dpd);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_docsis_dpd (void)
|
|
{
|
|
dissector_add_uint ("docsis_mgmt", 0x32, docsis_dpd_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|