plugins/docsis/packet-bintrngreq.c

   1 /* packet-bintrngreq.c
   2  * Routines for DOCSIS 3.0 Bonded Intial Ranging Request Message dissection.
   3  * Copyright 2009, Geoffrey Kimball <gekimbal[AT]cisco.com>
   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_bintrngreq = -1;
  32 static int hf_docsis_bintrngreq_down_chid = -1;
  33 static int hf_docsis_bintrngreq_mddsgid = -1;
  34 static int hf_docsis_bintrngreq_capflags = -1;
  35 static int hf_docsis_bintrngreq_up_chid = -1;
  36 static int hf_docsis_bintrngreq_capflags_frag = -1;
  37 static int hf_docsis_bintrngreq_capflags_encrypt = -1;
  38
  39
  40 /* Initialize the subtree pointers */
  41 static gint ett_docsis_bintrngreq = -1;
  42
  43 /* Code to actually dissect the packets */
  44 static void
  45 dissect_bintrngreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  46 {
  47   proto_item *bintrngreq_item;
  48   proto_tree *bintrngreq_tree;
  49   guint16 md_ds_sg_id;
  50
  51   md_ds_sg_id = tvb_get_ntohs (tvb, 0);
  52
  53   col_add_fstr (pinfo->cinfo, COL_INFO, "Bonded Ranging Request: MD-DS-SG-ID = %u (0x%X)",
  54                                         md_ds_sg_id, md_ds_sg_id );
  55
  56   if (tree)
  57   {
  58     guint16 offset = 0;
  59     bintrngreq_item = proto_tree_add_protocol_format (tree, proto_docsis_bintrngreq,
  60                                                                                    tvb, offset, tvb_length_remaining (tvb, 0),
  61                                                                                    "Bonded Initial Ranging Request");
  62     bintrngreq_tree = proto_item_add_subtree (bintrngreq_item, ett_docsis_bintrngreq);
  63     proto_tree_add_item (bintrngreq_tree, hf_docsis_bintrngreq_capflags,
  64                                                    tvb, offset, 1, ENC_BIG_ENDIAN);
  65     proto_tree_add_item( bintrngreq_tree, hf_docsis_bintrngreq_capflags_frag,
  66                                                    tvb, offset, 1, ENC_BIG_ENDIAN );
  67     proto_tree_add_item( bintrngreq_tree, hf_docsis_bintrngreq_capflags_encrypt,
  68                                                    tvb, offset, 1, ENC_BIG_ENDIAN );
  69     offset++;
  70     proto_tree_add_item (bintrngreq_tree, hf_docsis_bintrngreq_mddsgid,
  71                                                    tvb, offset, 1, ENC_BIG_ENDIAN);
  72     offset++;
  73     proto_tree_add_item (bintrngreq_tree, hf_docsis_bintrngreq_down_chid,
  74                                                    tvb, offset, 1, ENC_BIG_ENDIAN);
  75     offset++;
  76     proto_tree_add_item (bintrngreq_tree, hf_docsis_bintrngreq_up_chid,
  77                                                    tvb, offset, 1, ENC_BIG_ENDIAN);
  78   }
  79 }
  80
  81 /* Register the protocol with Wireshark */
  82
  83 /*
  84  * this format is required because a script is used to build the C function
  85  * that calls all the protocol registration.
  86  */
  87 void
  88 proto_register_docsis_bintrngreq (void)
  89 {
  90   /* Setup list of header fields  See Section 1.6.1 for details*/
  91   static hf_register_info hf[] = {
  92     {&hf_docsis_bintrngreq_capflags,
  93      {"Capability Flags", "docsis_bintrngreq.capflags",
  94       FT_UINT8, BASE_HEX, NULL, 0x0,
  95       NULL, HFILL}
  96     },
  97     { &hf_docsis_bintrngreq_capflags_frag,
  98      {"Pre-3.0 Fragmentation", "docsis_bintrngreq.capflags.frag",
  99       FT_BOOLEAN, 8, NULL, (1<<7),
 100       "Pre-3.0 DOCSIS fragmentation is supported prior to registration", HFILL }
 101     },
 102     { &hf_docsis_bintrngreq_capflags_encrypt,
 103      {"Early Auth. & Encrypt", "docsis_bintrngreq.capflags.encrypt",
 104       FT_BOOLEAN, 8, NULL, (1<<6),
 105       "Early Authentication and Encryption supported", HFILL }
 106     },
 107     {&hf_docsis_bintrngreq_mddsgid,
 108      {"MD-DS-SG-ID", "docsis_bintrngreq.mddsgid",
 109       FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
 110       "MAC Domain Downstream Service Group Identifier", HFILL}
 111     },
 112     {&hf_docsis_bintrngreq_down_chid,
 113      {"DS Chan ID", "docsis_bintrngreq.downchid",
 114       FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
 115       NULL, HFILL}
 116     },
 117     {&hf_docsis_bintrngreq_up_chid,
 118      {"US Chan ID", "docsis_bintrngreq.upchid",
 119       FT_UINT8, BASE_HEX_DEC, NULL, 0x0,
 120       NULL, HFILL}
 121     },
 122   };
 123
 124 /* Setup protocol subtree array */
 125   static gint *ett[] = {
 126     &ett_docsis_bintrngreq,
 127   };
 128
 129 /* Register the protocol name and description */
 130   proto_docsis_bintrngreq = proto_register_protocol ("DOCSIS Bonded Initial Ranging Message",
 131                                                  "DOCSIS B-INT-RNG-REQ",
 132                                                  "docsis_bintrngreq");
 133
 134 /* Required function calls to register the header fields and subtrees used */
 135   proto_register_field_array (proto_docsis_bintrngreq, hf, array_length (hf));
 136   proto_register_subtree_array (ett, array_length (ett));
 137
 138   register_dissector ("docsis_bintrngreq", dissect_bintrngreq, proto_docsis_bintrngreq);
 139 }
 140
 141
 142 /* If this dissector uses sub-dissector registration add a registration routine.
 143    This format is required because a script is used to find these routines and
 144    create the code that calls these routines.
 145 */
 146 void
 147 proto_reg_handoff_docsis_bintrngreq (void)
 148 {
 149   dissector_handle_t docsis_bintrngreq_handle;
 150
 151   docsis_bintrngreq_handle = find_dissector ("docsis_bintrngreq");
 152   dissector_add_uint ("docsis_mgmt", 0x22, docsis_bintrngreq_handle);
 153 }