plugins/docsis/packet-cmctrlreq.c

   1 /* packet-cmctrlreq.c
   2  * Routines for DOCSIS 3.0 CM Control 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_cmctrlreq = -1;
  32 static int hf_docsis_cmctrlreq_tranid = -1;
  33 static dissector_handle_t cmctrl_tlv_handle;
  34
  35 /* Initialize the subtree pointers */
  36 static gint ett_docsis_cmctrlreq = -1;
  37
  38 /* Code to actually dissect the packets */
  39 static void
  40 dissect_cmctrlreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  41 {
  42   proto_item *it;
  43   proto_tree *cmctrlreq_tree = NULL;
  44   guint16 transid;
  45   tvbuff_t *next_tvb;
  46
  47   transid = tvb_get_ntohs (tvb, 0);
  48
  49   col_add_fstr (pinfo->cinfo, COL_INFO,
  50             "CM Control Request: Transaction-Id = %u", transid);
  51
  52   if (tree)
  53     {
  54       it =
  55         proto_tree_add_protocol_format (tree, proto_docsis_cmctrlreq, tvb, 0, -1,
  56                                         "CM Control Request");
  57       cmctrlreq_tree = proto_item_add_subtree (it, ett_docsis_cmctrlreq);
  58       proto_tree_add_item (cmctrlreq_tree, hf_docsis_cmctrlreq_tranid, tvb, 0, 2,
  59                            ENC_BIG_ENDIAN);
  60
  61     }
  62     /* Call Dissector for Appendix C TLV's */
  63     next_tvb = tvb_new_subset_remaining (tvb, 2);
  64     call_dissector (cmctrl_tlv_handle, next_tvb, pinfo, cmctrlreq_tree);
  65 }
  66
  67
  68
  69
  70 /* Register the protocol with Wireshark */
  71
  72 /* this format is require because a script is used to build the C function
  73    that calls all the protocol registration.
  74 */
  75
  76 void
  77 proto_register_docsis_cmctrlreq (void)
  78 {
  79
  80 /* Setup list of header fields  See Section 1.6.1 for details*/
  81   static hf_register_info hf[] = {
  82     {&hf_docsis_cmctrlreq_tranid,
  83      {"Transaction Id", "docsis_cmctrlreq.tranid",
  84       FT_UINT16, BASE_DEC, NULL, 0x0,
  85       NULL, HFILL}
  86      },
  87   };
  88
  89 /* Setup protocol subtree array */
  90   static gint *ett[] = {
  91     &ett_docsis_cmctrlreq,
  92   };
  93
  94 /* Register the protocol name and description */
  95   proto_docsis_cmctrlreq =
  96     proto_register_protocol ("DOCSIS CM Control Request",
  97                              "DOCSIS CM-CTRL-REQ", "docsis_cmctrlreq");
  98
  99 /* Required function calls to register the header fields and subtrees used */
 100   proto_register_field_array (proto_docsis_cmctrlreq, hf, array_length (hf));
 101   proto_register_subtree_array (ett, array_length (ett));
 102
 103   register_dissector ("docsis_cmctrlreq", dissect_cmctrlreq, proto_docsis_cmctrlreq);
 104 }
 105
 106
 107 /* If this dissector uses sub-dissector registration add a registration routine.
 108    This format is required because a script is used to find these routines and
 109    create the code that calls these routines.
 110 */
 111 void
 112 proto_reg_handoff_docsis_cmctrlreq (void)
 113 {
 114   dissector_handle_t docsis_cmctrlreq_handle;
 115
 116   docsis_cmctrlreq_handle = find_dissector ("docsis_cmctrlreq");
 117   cmctrl_tlv_handle = find_dissector ("cmctrl_tlv");
 118   dissector_add_uint ("docsis_mgmt", 0x2A, docsis_cmctrlreq_handle);
 119 }