nexmon – Rev 1
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/* packet-dpd.c
* Routines for DOCSIS 3.1 Downstream Profile Descriptor dissection.
* Copyright 2016, Bruno Verstuyft <bruno.verstuyft@excentis.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#define SUBCARRIER_ASSIGNMENT_RANGE_LIST 5
#define SUBCARRIER_ASSIGNMENT_VECTOR 6
#define SUBCARRIER_ASSIGNMENT_RANGE_CONT 0
#define SUBCARRIER_ASSIGNMENT_RANGE_SKIPBY1 1
#define SUBCARRIER_ASSIGNMENT_LIST 2
void proto_register_docsis_dpd(void);
void proto_reg_handoff_docsis_dpd(void);
/* Initialize the protocol and registered fields */
static int proto_docsis_dpd = -1;
static int hf_docsis_dpd_tlv_unknown = -1;
static int hf_docsis_dpd_dschid = -1;
static int hf_docsis_dpd_prof_id = -1;
static int hf_docsis_dpd_ccc = -1;
static int hf_docsis_dpd_tlv_subc_assign_type = -1;
static int hf_docsis_dpd_tlv_subc_assign_value = -1;
static int hf_docsis_dpd_subc_assign_range = -1;
static int hf_docsis_dpd_tlv_subc_assign_reserved = -1;
static int hf_docsis_dpd_tlv_subc_assign_modulation = -1;
static int hf_docsis_dpd_subc_assign_index = -1;
static int hf_docsis_dpd_tlv_subc_assign_vector_oddness = -1;
static int hf_docsis_dpd_tlv_subc_assign_vector_reserved = -1;
static int hf_docsis_dpd_tlv_subc_assign_vector_subc_start = -1;
static int hf_docsis_dpd_tlv_subc_assign_vector_modulation_odd = -1;
static int hf_docsis_dpd_tlv_subc_assign_vector_modulation_even = -1;
static expert_field ei_docsis_dpd_tlvlen_bad = EI_INIT;
static expert_field ei_docsis_dpd_value_unknown = EI_INIT;
/* Initialize the subtree pointers */
static gint ett_docsis_dpd = -1;
static gint ett_docsis_dpd_tlv = -1;
static gint ett_docsis_dpd_tlv_subcarrier_assignment = -1;
static gint ett_docsis_dpd_tlv_subcarrier_assignment_vector = -1;
/*BASE_CUSTOM function for subcarrier range*/
static void
subc_assign_range(
char *buf,
guint32 value)
{
g_snprintf(buf, ITEM_LABEL_LENGTH,
"%u - %u",
value >> 16, value &0xFFFF);
}
static const value_string docsis_dpd_subc_assign_type_str[] = {
{0, "range, continuous"},
{1, "range, skip by 1"},
{2, "list"},
{3, "reserved"},
{0, NULL}
};
static const value_string docsis_dpd_subc_assign_value_str[] = {
{0, "specific value"},
{1, "default value"},
{0, NULL}
};
static const value_string docsis_dpd_subc_assign_modulation_str[] = {
{0, "zero-bit loaded"},
{1, "reserved"},
{2, "QPSK (for NPC profile only)"},
{3, "reserved"},
{4, "16-QAM"},
{5, "reserved"},
{6, "64-QAM"},
{7, "128-QAM"},
{8, "256-QAM"},
{9, "512-QAM"},
{10, "1024-QAM"},
{11, "2048-QAM"},
{12, "4096-QAM"},
{13, "8192-QAM"},
{14, "16384-QAM"},
{15, "reserved"},
{0, NULL}
};
static const value_string docsis_dpd_tlv_subc_assign_vector_oddness_str[] = {
{0, "N is even"},
{1, "N is odd"},
{0, NULL}
};
static const value_string docsis_dpd_tlv_subc_assign_vector_modulation_str[] = {
{0, "zero-bit loaded"},
{1, "continuous pilot"},
{2, "QPSK (for NPC profile only)"},
{3, "reserved"},
{4, "16-QAM"},
{5, "reserved"},
{6, "64-QAM"},
{7, "128-QAM"},
{8, "256-QAM"},
{9, "512-QAM"},
{10, "1024-QAM"},
{11, "2048-QAM"},
{12, "4096-QAM"},
{13, "8192-QAM"},
{14, "16384-QAM"},
{15, "reserved"},
{0, NULL}
};
/* Dissection */
static void
dissect_dpd_subcarrier_assignment_range_list(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, guint start, guint len)
{
proto_item *it;
proto_tree *subcarrier_assignment_tree;
guint8 subcarrier_assignment_type;
guint16 subcarrier_assignment_index;
it = proto_tree_add_protocol_format (tree, proto_docsis_dpd, tvb, start-2, len+2, ".5 Subcarrier Assignment Range/List");
subcarrier_assignment_tree = proto_item_add_subtree (it, ett_docsis_dpd_tlv_subcarrier_assignment);
proto_tree_add_item (subcarrier_assignment_tree, hf_docsis_dpd_tlv_subc_assign_type, tvb, start, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (subcarrier_assignment_tree, hf_docsis_dpd_tlv_subc_assign_value, tvb, start, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (subcarrier_assignment_tree, hf_docsis_dpd_tlv_subc_assign_reserved, tvb, start, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (subcarrier_assignment_tree, hf_docsis_dpd_tlv_subc_assign_modulation, tvb, start, 1, ENC_BIG_ENDIAN);
subcarrier_assignment_type = (tvb_get_guint8 (tvb, start) >> 6);
switch (subcarrier_assignment_type)
{
case SUBCARRIER_ASSIGNMENT_RANGE_CONT:
case SUBCARRIER_ASSIGNMENT_RANGE_SKIPBY1:
proto_tree_add_item (subcarrier_assignment_tree, hf_docsis_dpd_subc_assign_range, tvb, start + 1, 4, ENC_BIG_ENDIAN);
break;
case SUBCARRIER_ASSIGNMENT_LIST:
for (subcarrier_assignment_index = 0; subcarrier_assignment_index < len/2; ++subcarrier_assignment_index) {
proto_tree_add_item (subcarrier_assignment_tree, hf_docsis_dpd_subc_assign_index, tvb, start + 1 + 2*subcarrier_assignment_index, 2, ENC_BIG_ENDIAN);
}
break;
default:
expert_add_info_format(pinfo, subcarrier_assignment_tree, &ei_docsis_dpd_value_unknown, "Unknown subcarrier assignment type: %u", subcarrier_assignment_type);
break;
}
}
static void
dissect_dpd_subcarrier_assignment_vector(tvbuff_t * tvb, proto_tree * tree, guint start, guint len)
{
proto_item *it;
proto_tree *subcarrier_assignment_vector_tree;
guint8 subcarrier_assignment_vector_oddness;
guint vector_index;
it = proto_tree_add_protocol_format (tree, proto_docsis_dpd, tvb, start-3, len+3, ".6 Subcarrier Assignment Vector");
subcarrier_assignment_vector_tree = proto_item_add_subtree (it, ett_docsis_dpd_tlv_subcarrier_assignment_vector);
proto_tree_add_item (subcarrier_assignment_vector_tree, hf_docsis_dpd_tlv_subc_assign_vector_oddness, tvb, start, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (subcarrier_assignment_vector_tree, hf_docsis_dpd_tlv_subc_assign_vector_reserved, tvb, start, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (subcarrier_assignment_vector_tree, hf_docsis_dpd_tlv_subc_assign_vector_subc_start, tvb, start, 2, ENC_BIG_ENDIAN);
subcarrier_assignment_vector_oddness = (tvb_get_guint8(tvb, start) >> 7);
for(vector_index = 0; vector_index < len; ++vector_index)
{
proto_tree_add_item (subcarrier_assignment_vector_tree, hf_docsis_dpd_tlv_subc_assign_vector_modulation_odd, tvb, start + 2 + vector_index, 1, ENC_BIG_ENDIAN);
if (!((vector_index == len -1) && subcarrier_assignment_vector_oddness))
{
proto_tree_add_item (subcarrier_assignment_vector_tree, hf_docsis_dpd_tlv_subc_assign_vector_modulation_even, tvb, start + 2 + vector_index, 1, ENC_BIG_ENDIAN);
}
}
}
static void
dissect_dpd_tlv (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, guint start, guint len)
{
proto_item *it;
proto_tree *tlv_tree;
guint pos = start;
guint length;
guint8 type;
it = proto_tree_add_protocol_format (tree, proto_docsis_dpd, tvb, 0, len, "TLV Data");
tlv_tree = proto_item_add_subtree (it, ett_docsis_dpd_tlv);
while (pos < (len + start))
{
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_guint8 (tvb, pos++);
if(pos + length > start + len)
{
expert_add_info_format(pinfo, tlv_tree, &ei_docsis_dpd_tlvlen_bad, "Wrong TLV length: %u", length);
}
switch (type)
{
case SUBCARRIER_ASSIGNMENT_RANGE_LIST:
if (length >= 5)
{
dissect_dpd_subcarrier_assignment_range_list(tvb, pinfo, tlv_tree, pos, length);
}
else
{
expert_add_info_format(pinfo, tlv_tree, &ei_docsis_dpd_tlvlen_bad, "Wrong TLV length: %u", length);
}
break;
case SUBCARRIER_ASSIGNMENT_VECTOR:
/*FOR THIS TYPE, LENGTH IS 2 BYTES INSTEAD OF 1 */
length = tvb_get_ntohs (tvb, pos-1);
++pos;
if (length >=2)
{
dissect_dpd_subcarrier_assignment_vector(tvb, tlv_tree, pos, length);
}
else
{
expert_add_info_format(pinfo, tlv_tree, &ei_docsis_dpd_tlvlen_bad, "Wrong TLV length: %u", length);
}
break;
default: proto_tree_add_item (tlv_tree, hf_docsis_dpd_tlv_unknown, tvb, pos - 2, length+2, ENC_NA);
expert_add_info_format(pinfo, tlv_tree, &ei_docsis_dpd_value_unknown, "Unknown TLV: %u", type);
break;
} /* switch */
pos = pos + length;
} /* while */
}
static int
dissect_dpd (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
{
proto_item *it;
proto_tree *dpd_tree = NULL;
guint8 downstream_channel_id;
guint8 profile_identifier;
guint8 configuration_change_count;
guint len;
downstream_channel_id = tvb_get_guint8 (tvb, 0);
profile_identifier = tvb_get_guint8 (tvb, 1);
configuration_change_count = tvb_get_guint8 (tvb, 2);
len = tvb_captured_length_remaining (tvb, 3);
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);
if (tree)
{
it = proto_tree_add_protocol_format (tree, proto_docsis_dpd, tvb, 0, -1, "Downstream Profile Descriptor");
dpd_tree = proto_item_add_subtree (it, ett_docsis_dpd);
proto_tree_add_item (dpd_tree, hf_docsis_dpd_dschid, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (dpd_tree, hf_docsis_dpd_prof_id, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item (dpd_tree, hf_docsis_dpd_ccc, tvb, 2, 1, ENC_BIG_ENDIAN);
}
/* Call Dissector TLV's */
dissect_dpd_tlv(tvb, pinfo, dpd_tree, 3, len);
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_docsis_dpd(void)
{
static hf_register_info hf[] = {
{&hf_docsis_dpd_tlv_unknown,
{"Unknown TLV", "docsis_dpd.unknown_tlv",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_dpd_dschid,
{"Downstream Channel ID", "docsis_dpd.dschid", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{&hf_docsis_dpd_prof_id,
{"Profile Identifier", "docsis_dpd.prof_id", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{&hf_docsis_dpd_ccc,
{"Configuration Change Count", "docsis_dpd.ccc", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_type,
{"Subcarrier Assignment Type", "docsis_dpd.tlv.subc_assign.type", FT_UINT8, BASE_DEC, VALS(docsis_dpd_subc_assign_type_str), 0xC0, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_value,
{"Subcarrier Assignment Value", "docsis_dpd.tlv.subc_assign.value", FT_UINT8, BASE_DEC, VALS(docsis_dpd_subc_assign_value_str), 0x20, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_reserved,
{"reserved", "docsis_dpd.tlv.subc_assign.reserved", FT_UINT8, BASE_DEC, NULL, 0x10, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_modulation,
{"Subcarrier Assignment Modulation", "docsis_dpd.tlv.subc_assign.modulation", FT_UINT8, BASE_DEC, VALS(docsis_dpd_subc_assign_modulation_str), 0x0F, NULL, HFILL}
},
{&hf_docsis_dpd_subc_assign_range,
{"Subcarrier index range", "docsis_dpd.tlv.subc_assign.range", FT_UINT32, BASE_CUSTOM, CF_FUNC(subc_assign_range), 0x00, NULL, HFILL}
},
{&hf_docsis_dpd_subc_assign_index,
{"Subcarrier index", "docsis_dpd.tlv.subc_assign.index", FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_vector_oddness,
{"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}
},
{&hf_docsis_dpd_tlv_subc_assign_vector_reserved,
{"Reserved", "docsis_dpd.tlv.subc_assign_vect.reserved", FT_UINT8, BASE_DEC, NULL, 0x60, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_vector_subc_start,
{"Subcarrier start", "docsis_dpd.tlv.subc_assign_vect.subc_start", FT_UINT16, BASE_DEC, NULL, 0x1FFF, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_vector_modulation_odd,
{"Modulation", "docsis_dpd.tlv.subc_assign_vect.modulation", FT_UINT8, BASE_DEC, VALS(docsis_dpd_tlv_subc_assign_vector_modulation_str), 0xF0, NULL, HFILL}
},
{&hf_docsis_dpd_tlv_subc_assign_vector_modulation_even,
{"Modulation", "docsis_dpd.tlv.subc_assign_vect.modulation", FT_UINT8, BASE_DEC, VALS(docsis_dpd_tlv_subc_assign_vector_modulation_str), 0x0F, NULL, HFILL}
},
};
static ei_register_info ei[] = {
{&ei_docsis_dpd_tlvlen_bad, { "docsis_dpd.tlvlenbad", PI_MALFORMED, PI_ERROR, "Bad TLV length", EXPFILL}},
{&ei_docsis_dpd_value_unknown, { "docsis_dpd.valueunknown", PI_PROTOCOL, PI_WARN, "Unknown value", EXPFILL}}
};
static gint *ett[] = {
&ett_docsis_dpd,
&ett_docsis_dpd_tlv,
&ett_docsis_dpd_tlv_subcarrier_assignment,
&ett_docsis_dpd_tlv_subcarrier_assignment_vector
};
expert_module_t* expert_docsis_dpd;
proto_docsis_dpd = proto_register_protocol ("DOCSIS Downstream Profile Descriptor", "DOCSIS DPD", "docsis_dpd");
proto_register_field_array (proto_docsis_dpd, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
expert_docsis_dpd = expert_register_protocol(proto_docsis_dpd);
expert_register_field_array(expert_docsis_dpd, ei, array_length(ei));
register_dissector ("docsis_dpd", dissect_dpd, proto_docsis_dpd);
}
void
proto_reg_handoff_docsis_dpd (void)
{
dissector_handle_t docsis_dpd_handle;
docsis_dpd_handle = find_dissector ("docsis_dpd");
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:
*/