plugins/docsis/packet-cmctrlrsp.c

   1 /* packet-cmctrlrsp.c
   2  * Routines for DOCSIS 3.0 CM Control Response 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 #define RNGRSP_TIMING 1
  31 #define RNGRSP_PWR_LEVEL_ADJ 2
  32 #define RNGRSP_OFFSET_FREQ_ADJ 3
  33 #define RNGRSP_TRANSMIT_EQ_ADJ 4
  34 #define RNGRSP_RANGING_STATUS 5
  35 #define RNGRSP_DOWN_FREQ_OVER 6
  36 #define RNGRSP_UP_CHID_OVER 7
  37
  38 /* Initialize the protocol and registered fields */
  39 static int proto_docsis_cmctrlrsp = -1;
  40 static int hf_docsis_cmctrlrsp_tranid = -1;
  41 static dissector_handle_t cmctrl_tlv_handle;
  42
  43 /* Initialize the subtree pointers */
  44 static gint ett_docsis_cmctrlrsp = -1;
  45
  46 /* Code to actually dissect the packets */
  47 static void
  48 dissect_cmctrlrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  49 {
  50   proto_item *it;
  51   proto_tree *cmctrlrsp_tree = NULL;
  52   guint16 transid;
  53   tvbuff_t *next_tvb;
  54
  55   transid = tvb_get_ntohs (tvb, 0);
  56
  57   col_add_fstr (pinfo->cinfo, COL_INFO,
  58             "CM Control Response: Transaction-Id = %u", transid);
  59
  60   if (tree)
  61     {
  62       it =
  63         proto_tree_add_protocol_format (tree, proto_docsis_cmctrlrsp, tvb, 0, -1,
  64                                         "CM Control Response");
  65       cmctrlrsp_tree = proto_item_add_subtree (it, ett_docsis_cmctrlrsp);
  66       proto_tree_add_item (cmctrlrsp_tree, hf_docsis_cmctrlrsp_tranid, tvb, 0, 2,
  67                            ENC_BIG_ENDIAN);
  68
  69     }
  70     /* Call Dissector for Appendix C TLV's */
  71     next_tvb = tvb_new_subset_remaining (tvb, 2);
  72     call_dissector (cmctrl_tlv_handle, next_tvb, pinfo, cmctrlrsp_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 void
  85 proto_register_docsis_cmctrlrsp (void)
  86 {
  87
  88 /* Setup list of header fields  See Section 1.6.1 for details*/
  89   static hf_register_info hf[] = {
  90     {&hf_docsis_cmctrlrsp_tranid,
  91      {"Transaction Id", "docsis_cmctrlrsp.tranid",
  92       FT_UINT16, BASE_DEC, NULL, 0x0,
  93       NULL, HFILL}
  94      },
  95   };
  96
  97 /* Setup protocol subtree array */
  98   static gint *ett[] = {
  99     &ett_docsis_cmctrlrsp,
 100   };
 101
 102 /* Register the protocol name and description */
 103   proto_docsis_cmctrlrsp =
 104     proto_register_protocol ("DOCSIS CM Control Response",
 105                              "DOCSIS CM-CTRL-RSP", "docsis_cmctrlrsp");
 106
 107 /* Required function calls to register the header fields and subtrees used */
 108   proto_register_field_array (proto_docsis_cmctrlrsp, hf, array_length (hf));
 109   proto_register_subtree_array (ett, array_length (ett));
 110
 111   register_dissector ("docsis_cmctrlrsp", dissect_cmctrlrsp, proto_docsis_cmctrlrsp);
 112 }
 113
 114
 115 /* If this dissector uses sub-dissector registration add a registration routine.
 116    This format is required because a script is used to find these routines and
 117    create the code that calls these routines.
 118 */
 119 void
 120 proto_reg_handoff_docsis_cmctrlrsp (void)
 121 {
 122   dissector_handle_t docsis_cmctrlrsp_handle;
 123
 124   docsis_cmctrlrsp_handle = find_dissector ("docsis_cmctrlrsp");
 125   cmctrl_tlv_handle = find_dissector ("cmctrl_tlv");
 126   dissector_add_uint ("docsis_mgmt", 0x2B, docsis_cmctrlrsp_handle);
 127 }