608 lines
15 KiB
C
608 lines
15 KiB
C
/* packet-dccreq.c
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* Routines for DCC Request Message dissection
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* Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.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/exceptions.h>
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void proto_register_docsis_dccreq(void);
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void proto_reg_handoff_docsis_dccreq(void);
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#define DCCREQ_UP_CHAN_ID 1
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#define DCCREQ_DS_PARAMS 2
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#define DCCREQ_INIT_TECH 3
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#define DCCREQ_UCD_SUB 4
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#define DCCREQ_SAID_SUB 6
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#define DCCREQ_SF_SUB 7
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#define DCCREQ_CMTS_MAC_ADDR 8
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#define DCCREQ_KEY_SEQ_NUM 31
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#define DCCREQ_HMAC_DIGEST 27
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/* Define Downstrean Parameters subtypes
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* These are subtype of DCCREQ_DS_PARAMS (2)
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*/
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#define DCCREQ_DS_FREQ 1
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#define DCCREQ_DS_MOD_TYPE 2
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#define DCCREQ_DS_SYM_RATE 3
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#define DCCREQ_DS_INTLV_DEPTH 4
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#define DCCREQ_DS_CHAN_ID 5
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#define DCCREQ_DS_SYNC_SUB 6
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/* Define Service Flow Substitution subtypes
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* These are subtypes of DCCREQ_SF_SUB (7)
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*/
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#define DCCREQ_SF_SFID 1
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#define DCCREQ_SF_SID 2
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#define DCCREQ_SF_UNSOL_GRANT_TREF 5
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/* Initialize the protocol and registered fields */
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static int proto_docsis_dccreq = -1;
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static int hf_docsis_dccreq_tran_id = -1;
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static int hf_docsis_dccreq_up_chan_id = -1;
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static int hf_docsis_dccreq_ds_freq = -1;
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static int hf_docsis_dccreq_ds_mod_type = -1;
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static int hf_docsis_dccreq_ds_sym_rate = -1;
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static int hf_docsis_dccreq_ds_intlv_depth_i = -1;
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static int hf_docsis_dccreq_ds_intlv_depth_j = -1;
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static int hf_docsis_dccreq_ds_chan_id = -1;
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static int hf_docsis_dccreq_ds_sync_sub = -1;
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static int hf_docsis_dccreq_init_tech = -1;
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static int hf_docsis_dccreq_ucd_sub = -1;
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static int hf_docsis_dccreq_said_sub_cur = -1;
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static int hf_docsis_dccreq_said_sub_new = -1;
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static int hf_docsis_dccreq_sf_sfid_cur = -1;
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static int hf_docsis_dccreq_sf_sfid_new = -1;
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static int hf_docsis_dccreq_sf_sid_cur = -1;
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static int hf_docsis_dccreq_sf_sid_new = -1;
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static int hf_docsis_dccreq_sf_unsol_grant_tref = -1;
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static int hf_docsis_dccreq_cmts_mac_addr = -1;
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static int hf_docsis_dccreq_key_seq_num = -1;
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static int hf_docsis_dccreq_hmac_digest = -1;
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/* Initialize the subtree pointers */
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static gint ett_docsis_dccreq = -1;
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static gint ett_docsis_dccreq_ds_params = -1;
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static gint ett_docsis_dccreq_sf_sub = -1;
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value_string ds_mod_type_vals[] = {
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{0 , "64 QAM"},
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{1 , "256 QAM"},
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{0, NULL}
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};
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value_string ds_sym_rate_vals[] = {
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{0 , "5.056941 Msym/sec"},
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{1 , "5.360537 Msym/sec"},
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{2 , "6.952 Msym/sec"},
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{0, NULL}
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};
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value_string init_tech_vals[] = {
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{0 , "Reinitialize MAC"},
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{1 , "Broadcast Init RNG on new chanbefore normal op"},
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{2 , "Unicast RNG on new chan before normal op"},
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{3 , "Either Unicast or broadcast RNG on new chan before normal op"},
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{4 , "Use new chan directly without re-init or RNG"},
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{0, NULL}
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};
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/* Code to actually dissect the packets */
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static void
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dissect_dccreq_ds_params (tvbuff_t * tvb, proto_tree * tree, int start, guint16 len)
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{
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guint8 type, length;
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proto_item *dcc_item;
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proto_tree *dcc_tree;
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int pos;
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pos = start;
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dcc_item = proto_tree_add_text ( tree, tvb, start, len, "2 DCC-REQ Downstream Params Encodings (Length = %u)", len);
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dcc_tree = proto_item_add_subtree ( dcc_item , ett_docsis_dccreq_ds_params);
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while ( pos < ( start + len) )
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case DCCREQ_DS_FREQ:
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if (length == 4)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_freq, tvb,
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pos, length, 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 DCCREQ_DS_MOD_TYPE:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_mod_type, tvb,
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pos, length, 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 DCCREQ_DS_SYM_RATE:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_sym_rate, tvb,
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pos, length, 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 DCCREQ_DS_INTLV_DEPTH:
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if (length == 2)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_intlv_depth_i, tvb,
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pos, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_intlv_depth_j, tvb,
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pos + 1, 1, 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 DCCREQ_DS_CHAN_ID:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_chan_id, tvb,
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pos, length, 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 DCCREQ_DS_SYNC_SUB:
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ds_sync_sub, tvb,
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pos, length, ENC_BIG_ENDIAN);
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break;
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}
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pos = pos + length;
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}
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}
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static void
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dissect_dccreq_sf_sub (tvbuff_t * tvb, proto_tree * tree, int start, guint16 len)
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{
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guint8 type, length;
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proto_item *dcc_item;
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proto_tree *dcc_tree;
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int pos;
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pos = start;
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dcc_item = proto_tree_add_text ( tree, tvb, start, len, "7 DCC-REQ Service Flow Substitution Encodings (Length = %u)", len);
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dcc_tree = proto_item_add_subtree ( dcc_item , ett_docsis_dccreq_sf_sub);
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while ( pos < ( start + len) )
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case DCCREQ_SF_SFID:
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if (length == 8)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_sf_sfid_cur, tvb,
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pos, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_sf_sfid_new, tvb,
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pos + 4, 4, 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 DCCREQ_SF_SID:
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if (length == 4)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_sf_sid_cur, tvb,
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pos, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_sf_sid_new, tvb,
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pos + 2, 2, 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 DCCREQ_SF_UNSOL_GRANT_TREF:
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if (length == 4)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_sf_unsol_grant_tref, tvb,
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pos, length, 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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}
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pos = pos + length;
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}
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}
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static void
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dissect_dccreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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guint16 pos;
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guint8 type, length;
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proto_tree *dcc_tree;
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proto_item *dcc_item;
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guint16 len;
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len = tvb_length_remaining (tvb, 0);
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col_set_str(pinfo->cinfo, COL_INFO, "DCC-REQ Message: ");
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if (tree)
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{
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dcc_item =
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proto_tree_add_protocol_format (tree, proto_docsis_dccreq, tvb, 0,
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tvb_length_remaining (tvb, 0),
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"DCC-REQ Message");
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dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccreq);
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_tran_id, tvb, 0, 2, ENC_BIG_ENDIAN);
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pos = 2;
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while (pos < len)
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case DCCREQ_UP_CHAN_ID:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_up_chan_id, tvb,
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pos, length, 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 DCCREQ_DS_PARAMS:
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dissect_dccreq_ds_params (tvb , dcc_tree , pos , length );
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break;
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case DCCREQ_INIT_TECH:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_init_tech, tvb,
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pos, length, 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 DCCREQ_UCD_SUB:
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_ucd_sub, tvb,
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pos, length, ENC_NA);
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break;
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case DCCREQ_SAID_SUB:
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if (length == 4)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_said_sub_cur, tvb,
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pos, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_said_sub_new, tvb,
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pos + 2, 2, 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 DCCREQ_SF_SUB:
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dissect_dccreq_sf_sub (tvb , dcc_tree , pos , length );
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break;
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case DCCREQ_CMTS_MAC_ADDR:
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if (length == 6)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_cmts_mac_addr, tvb,
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pos, length, ENC_NA);
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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 DCCREQ_KEY_SEQ_NUM:
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if (length == 1)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_key_seq_num, tvb,
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pos, length, 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 DCCREQ_HMAC_DIGEST:
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if (length == 20)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccreq_hmac_digest, tvb,
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pos, length, ENC_NA);
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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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} /* switch(type) */
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pos = pos + length;
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} /* while (pos < len) */
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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_dccreq (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_dccreq_tran_id ,
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{
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"Transaction ID",
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"docsis_dccreq.tran_id",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_up_chan_id ,
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{
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"Up Channel ID",
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"docsis_dccreq.up_chan_id",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_freq ,
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{
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"Frequency",
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"docsis_dccreq.ds_freq",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_mod_type ,
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{
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"Modulation Type",
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"docsis_dccreq.ds_mod_type",
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FT_UINT8, BASE_DEC, VALS (ds_mod_type_vals), 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_sym_rate ,
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{
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"Symbol Rate",
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"docsis_dccreq.ds_sym_rate",
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FT_UINT8, BASE_DEC, VALS (ds_sym_rate_vals), 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_intlv_depth_i ,
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{
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"Interleaver Depth I Value",
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"docsis_dccreq.ds_intlv_depth_i",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_intlv_depth_j ,
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{
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"Interleaver Depth J Value",
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"docsis_dccreq.ds_intlv_depth_j",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_chan_id ,
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{
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"Downstream Channel ID",
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"docsis_dccreq.ds_chan_id",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ds_sync_sub ,
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{
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"SYNC Substitution",
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"docsis_dccreq.ds_sync_sub",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_init_tech ,
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{
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"Initialization Technique",
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"docsis_dccreq.init_tech",
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FT_UINT8, BASE_DEC, VALS (init_tech_vals), 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_ucd_sub ,
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{
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"UCD Substitution",
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"docsis_dccreq.ucd_sub",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_said_sub_cur ,
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{
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"SAID Sub - Current Value",
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"docsis_dccreq.said_sub_cur",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccreq_said_sub_new ,
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{
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"SAID Sub - New Value",
|
|
"docsis_dccreq.said_sub_new",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_sf_sfid_cur ,
|
|
{
|
|
"SF Sub - SFID Current Value",
|
|
"docsis_dccreq.sf_sfid_cur",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_sf_sfid_new ,
|
|
{
|
|
"SF Sub - SFID New Value",
|
|
"docsis_dccreq.sf_sfid_new",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_sf_sid_cur ,
|
|
{
|
|
"SF Sub - SID Current Value",
|
|
"docsis_dccreq.sf_sid_cur",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_sf_sid_new ,
|
|
{
|
|
"SF Sub - SID New Value",
|
|
"docsis_dccreq.sf_sid_new",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_sf_unsol_grant_tref ,
|
|
{
|
|
"SF Sub - Unsolicited Grant Time Reference",
|
|
"docsis_dccreq.sf_unsol_grant_tref",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_cmts_mac_addr ,
|
|
{
|
|
"CMTS Mac Address",
|
|
"docsis_dccreq.cmts_mac_addr",
|
|
FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_key_seq_num ,
|
|
{
|
|
"Auth Key Sequence Number",
|
|
"docsis_dccreq.key_seq_num",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
{&hf_docsis_dccreq_hmac_digest ,
|
|
{
|
|
"HMAC-DigestNumber",
|
|
"docsis_dccreq.hmac_digest",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL,
|
|
HFILL
|
|
}
|
|
},
|
|
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_docsis_dccreq,
|
|
&ett_docsis_dccreq_sf_sub,
|
|
&ett_docsis_dccreq_ds_params,
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_docsis_dccreq =
|
|
proto_register_protocol ("DOCSIS Downstream Channel Change Request",
|
|
"DOCSIS DCC-REQ", "docsis_dccreq");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array (proto_docsis_dccreq, hf, array_length (hf));
|
|
proto_register_subtree_array (ett, array_length (ett));
|
|
|
|
register_dissector ("docsis_dccreq", dissect_dccreq, proto_docsis_dccreq);
|
|
}
|
|
|
|
|
|
/* 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_dccreq (void)
|
|
{
|
|
dissector_handle_t docsis_dccreq_handle;
|
|
|
|
docsis_dccreq_handle = find_dissector ("docsis_dccreq");
|
|
dissector_add_uint ("docsis_mgmt", 0x17, docsis_dccreq_handle);
|
|
|
|
}
|