plugins/docsis/packet-dsdreq.c

   1 /* packet-dsdreq.c
   2  * Routines for Dynamic Service Delete Request dissection
   3  * Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
   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_dsdreq = -1;
  32 static int hf_docsis_dsdreq_tranid = -1;
  33 static int hf_docsis_dsdreq_rsvd = -1;
  34 static int hf_docsis_dsdreq_sfid = -1;
  35
  36 static dissector_handle_t docsis_tlv_handle;
  37
  38
  39 /* Initialize the subtree pointers */
  40 static gint ett_docsis_dsdreq = -1;
  41
  42 /* Code to actually dissect the packets */
  43 static void
  44 dissect_dsdreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  45 {
  46
  47   proto_item *it;
  48   proto_tree *dsdreq_tree = NULL;
  49   guint16 transid;
  50   tvbuff_t *next_tvb;
  51
  52   transid = tvb_get_ntohs (tvb, 0);
  53
  54   col_add_fstr (pinfo->cinfo, COL_INFO,
  55             "Dynamic Service Delete Request Tran-id = %u", transid);
  56   if (tree)
  57     {
  58       it =
  59         proto_tree_add_protocol_format (tree, proto_docsis_dsdreq, tvb, 0, -1,
  60                                         "DSD Request");
  61       dsdreq_tree = proto_item_add_subtree (it, ett_docsis_dsdreq);
  62       proto_tree_add_item (dsdreq_tree, hf_docsis_dsdreq_tranid, tvb, 0, 2,
  63                            ENC_BIG_ENDIAN);
  64       proto_tree_add_item (dsdreq_tree, hf_docsis_dsdreq_rsvd, tvb, 2, 2,
  65                            ENC_BIG_ENDIAN);
  66       proto_tree_add_item (dsdreq_tree, hf_docsis_dsdreq_sfid, tvb, 4, 4,
  67                            ENC_BIG_ENDIAN);
  68
  69     }
  70     /* Call Dissector for Appendix C TLV's */
  71     next_tvb = tvb_new_subset_remaining (tvb, 8);
  72     call_dissector (docsis_tlv_handle, next_tvb, pinfo, dsdreq_tree);
  73 }
  74
  75
  76
  77
  78 /* Register the protocol with Wireshark */
  79
  80 /* this format is require because a script is used to build the C function
  81    that calls all the protocol registration.
  82 */
  83
  84
  85 void
  86 proto_register_docsis_dsdreq (void)
  87 {
  88
  89 /* Setup list of header fields  See Section 1.6.1 for details*/
  90   static hf_register_info hf[] = {
  91     {&hf_docsis_dsdreq_tranid,
  92      {"Transaction Id", "docsis_dsdreq.tranid",
  93       FT_UINT16, BASE_DEC, NULL, 0x0,
  94       NULL, HFILL}
  95      },
  96     {&hf_docsis_dsdreq_rsvd,
  97      {"Reserved", "docsis_dsdreq.rsvd",
  98       FT_UINT16, BASE_HEX, NULL, 0x0,
  99       NULL, HFILL}
 100      },
 101     {&hf_docsis_dsdreq_sfid,
 102      {"Service Flow ID", "docsis_dsdreq.sfid",
 103       FT_UINT32, BASE_DEC, NULL, 0x0,
 104       NULL, HFILL}
 105      },
 106   };
 107
 108 /* Setup protocol subtree array */
 109   static gint *ett[] = {
 110     &ett_docsis_dsdreq,
 111   };
 112
 113 /* Register the protocol name and description */
 114   proto_docsis_dsdreq =
 115     proto_register_protocol ("DOCSIS Dynamic Service Delete Request",
 116                              "DOCSIS DSD-REQ", "docsis_dsdreq");
 117
 118 /* Required function calls to register the header fields and subtrees used */
 119   proto_register_field_array (proto_docsis_dsdreq, hf, array_length (hf));
 120   proto_register_subtree_array (ett, array_length (ett));
 121
 122   register_dissector ("docsis_dsdreq", dissect_dsdreq, proto_docsis_dsdreq);
 123 }
 124
 125
 126 /* If this dissector uses sub-dissector registration add a registration routine.
 127    This format is required because a script is used to find these routines and
 128    create the code that calls these routines.
 129 */
 130 void
 131 proto_reg_handoff_docsis_dsdreq (void)
 132 {
 133   dissector_handle_t docsis_dsdreq_handle;
 134
 135   docsis_dsdreq_handle = find_dissector ("docsis_dsdreq");
 136   docsis_tlv_handle = find_dissector ("docsis_tlv");
 137   dissector_add_uint ("docsis_mgmt", 0x15, docsis_dsdreq_handle);
 138
 139 }