plugins/docsis/packet-dbcreq.c

   1 /* packet-dbcreq.c
   2  * Routines for DOCSIS 3.0 Dynamic Bonding Change Request Message dissection.
   3  * Copyright 2010, Guido Reismueller <g.reismueller[AT]avm.de>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <epan/packet.h>
  29
  30 /* Initialize the protocol and registered fields */
  31 static int proto_docsis_dbcreq = -1;
  32 static int hf_docsis_dbcreq_tranid = -1;
  33 static int hf_docsis_dbcreq_number_of_fragments = -1;
  34 static int hf_docsis_dbcreq_fragment_sequence_number = -1;
  35 static dissector_handle_t docsis_tlv_handle;
  36
  37 /* Initialize the subtree pointers */
  38 static gint ett_docsis_dbcreq = -1;
  39
  40 /* Code to actually dissect the packets */
  41 static void
  42 dissect_dbcreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  43 {
  44   proto_item *dbcreq_item;
  45   proto_tree *dbcreq_tree = NULL;
  46   guint16 transid;
  47   tvbuff_t *next_tvb;
  48
  49   transid = tvb_get_ntohs (tvb, 0);
  50
  51   col_add_fstr (pinfo->cinfo, COL_INFO,
  52             "Dynamic Bonding Change Request: Tran-Id = %u", transid);
  53
  54   if (tree)
  55   {
  56     dbcreq_item = proto_tree_add_protocol_format (tree, proto_docsis_dbcreq,
  57                                                                                    tvb, 0, -1,
  58                                                                                    "Dynamic Bonding Change Request");
  59     dbcreq_tree = proto_item_add_subtree (dbcreq_item, ett_docsis_dbcreq);
  60     proto_tree_add_item (dbcreq_tree, hf_docsis_dbcreq_tranid,
  61                                                    tvb, 0, 2, ENC_BIG_ENDIAN);
  62     proto_tree_add_item( dbcreq_tree, hf_docsis_dbcreq_number_of_fragments,
  63                                                    tvb, 2, 1, ENC_BIG_ENDIAN );
  64     proto_tree_add_item( dbcreq_tree, hf_docsis_dbcreq_fragment_sequence_number ,
  65                                                    tvb, 3, 1, ENC_BIG_ENDIAN );
  66   }
  67   /* Call Dissector for Appendix C TLV's */
  68   next_tvb = tvb_new_subset_remaining (tvb, 4);
  69   call_dissector (docsis_tlv_handle, next_tvb, pinfo, dbcreq_tree);
  70 }
  71
  72 /* Register the protocol with Wireshark */
  73
  74 /*
  75  * this format is required because a script is used to build the C function
  76  * that calls all the protocol registration.
  77  */
  78 void
  79 proto_register_docsis_dbcreq (void)
  80 {
  81   /* Setup list of header fields  See Section 1.6.1 for details*/
  82   static hf_register_info hf[] = {
  83     {&hf_docsis_dbcreq_tranid,
  84      {"Transaction Id", "docsis_dbcreq.tranid",
  85       FT_UINT16, BASE_DEC, NULL, 0x0,
  86       NULL, HFILL}
  87      },
  88     {&hf_docsis_dbcreq_number_of_fragments,
  89      {"Number of Fragments", "docsis_dbcreq.number_of_fragments",
  90       FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
  91       NULL, HFILL}
  92     },
  93     {&hf_docsis_dbcreq_fragment_sequence_number,
  94      {"Fragment Seq No", "docsis_dbcreq.fragment_sequence_number",
  95       FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
  96       NULL, HFILL}
  97     },
  98   };
  99
 100 /* Setup protocol subtree array */
 101   static gint *ett[] = {
 102     &ett_docsis_dbcreq,
 103   };
 104
 105 /* Register the protocol name and description */
 106   proto_docsis_dbcreq = proto_register_protocol ("DOCSIS Dynamic Bonding Change Request",
 107                                                  "DOCSIS DBC-REQ",
 108                                                  "docsis_dbcreq");
 109
 110 /* Required function calls to register the header fields and subtrees used */
 111   proto_register_field_array (proto_docsis_dbcreq, hf, array_length (hf));
 112   proto_register_subtree_array (ett, array_length (ett));
 113
 114   register_dissector ("docsis_dbcreq", dissect_dbcreq, proto_docsis_dbcreq);
 115 }
 116
 117
 118 /* If this dissector uses sub-dissector registration add a registration routine.
 119    This format is required because a script is used to find these routines and
 120    create the code that calls these routines.
 121 */
 122 void
 123 proto_reg_handoff_docsis_dbcreq (void)
 124 {
 125   dissector_handle_t docsis_dbcreq_handle;
 126
 127   docsis_dbcreq_handle = find_dissector ("docsis_dbcreq");
 128   docsis_tlv_handle = find_dissector ("docsis_tlv");
 129   dissector_add_uint ("docsis_mgmt", 0x24, docsis_dbcreq_handle);
 130 }