plugins/epan/wimax/msg_dsc.c

   1 /* msg_dsc.c
   2  * WiMax MAC Management DSC-REQ/RSP/ACK Messages decoder
   3  *
   4  * Copyright (c) 2007 by Intel Corporation.
   5  *
   6  * Author: Lu Pan <lu.pan@intel.com>
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1999 Gerald Combs
  11  *
  12  * SPDX-License-Identifier: GPL-2.0-or-later
  13  */
  14
  15 /* Include files */
  16
  17 #include "config.h"
  18
  19 /*
  20 #define DEBUG
  21 */
  22
  23 #include <epan/packet.h>
  24 #include "wimax_mac.h"
  25 #include "wimax_utils.h"
  26
  27 void proto_register_mac_mgmt_msg_dsc(void);
  28 void proto_reg_handoff_mac_mgmt_msg_dsc(void);
  29
  30 static dissector_handle_t dsc_req_handle;
  31 static dissector_handle_t dsc_rsp_handle;
  32 static dissector_handle_t dsc_ack_handle;
  33
  34 static int proto_mac_mgmt_msg_dsc_decoder;
  35 static int ett_mac_mgmt_msg_dsc_req_decoder;
  36 static int ett_mac_mgmt_msg_dsc_rsp_decoder;
  37 static int ett_mac_mgmt_msg_dsc_ack_decoder;
  38
  39 /* fix fields */
  40 static int hf_dsc_transaction_id;
  41 static int hf_dsc_confirmation_code;
  42
  43
  44 static int dissect_mac_mgmt_msg_dsc_req_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  45 {
  46         unsigned offset = 0;
  47         proto_item *dsc_item;
  48         proto_tree *dsc_tree;
  49
  50         {       /* we are being asked for details */
  51
  52                 /* display MAC message type */
  53                 dsc_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dsc_decoder, tvb, offset, -1,
  54                                                           "Dynamic Service Change Request (DSC-REQ)");
  55                 /* add MAC DSx subtree */
  56                 dsc_tree = proto_item_add_subtree(dsc_item, ett_mac_mgmt_msg_dsc_req_decoder);
  57                 /* Decode and display the Uplink Channel Descriptor (UCD) */
  58                 /* display the Transaction ID */
  59                 proto_tree_add_item(dsc_tree, hf_dsc_transaction_id, tvb, offset, 2, ENC_BIG_ENDIAN);
  60                 /* move to next field */
  61                 offset += 2;
  62                 /* process DSC REQ message TLV Encode Information */
  63                 wimax_common_tlv_encoding_decoder(tvb_new_subset_remaining(tvb, offset), pinfo, dsc_tree);
  64         }
  65         return tvb_captured_length(tvb);
  66 }
  67
  68 static int dissect_mac_mgmt_msg_dsc_rsp_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  69 {
  70         unsigned offset = 0;
  71         proto_item *dsc_item;
  72         proto_tree *dsc_tree;
  73
  74         {       /* we are being asked for details */
  75                 /* display MAC message type */
  76                 dsc_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dsc_decoder, tvb, offset, -1,
  77                                                         "Dynamic Service Change Response (DSC-RSP)");
  78                 /* add MAC DSx subtree */
  79                 dsc_tree = proto_item_add_subtree(dsc_item, ett_mac_mgmt_msg_dsc_rsp_decoder);
  80                 /* Decode and display the Uplink Channel Descriptor (UCD) */
  81                 /* display the Transaction ID */
  82                 proto_tree_add_item(dsc_tree, hf_dsc_transaction_id, tvb, offset, 2, ENC_BIG_ENDIAN);
  83                 /* move to next field */
  84                 offset += 2;
  85                 /* display the Confirmation Code */
  86                 proto_tree_add_item(dsc_tree, hf_dsc_confirmation_code, tvb, offset, 1, ENC_BIG_ENDIAN);
  87                 /* move to next field */
  88                 offset++;
  89                 /* process DSC RSP message TLV Encode Information */
  90                 wimax_common_tlv_encoding_decoder(tvb_new_subset_remaining(tvb, offset), pinfo, dsc_tree);
  91         }
  92         return tvb_captured_length(tvb);
  93 }
  94
  95 static int dissect_mac_mgmt_msg_dsc_ack_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  96 {
  97         unsigned offset = 0;
  98         proto_item *dsc_item;
  99         proto_tree *dsc_tree;
 100
 101         {       /* we are being asked for details */
 102                 /* display MAC message type */
 103                 dsc_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dsc_decoder, tvb, offset, -1,
 104                                                           "Dynamic Service Change Acknowledge (DSC-ACK)");
 105                 /* add MAC DSx subtree */
 106                 dsc_tree = proto_item_add_subtree(dsc_item, ett_mac_mgmt_msg_dsc_ack_decoder);
 107                 /* Decode and display the Uplink Channel Descriptor (UCD) */
 108                 /* display the Transaction ID */
 109                 proto_tree_add_item(dsc_tree, hf_dsc_transaction_id, tvb, offset, 2, ENC_BIG_ENDIAN);
 110                 /* move to next field */
 111                 offset += 2;
 112                 /* display the Confirmation Code */
 113                 proto_tree_add_item(dsc_tree, hf_dsc_confirmation_code, tvb, offset, 1, ENC_BIG_ENDIAN);
 114                 /* move to next field */
 115                 offset++;
 116                 /* process DSC ACK message TLV Encode Information */
 117                 wimax_common_tlv_encoding_decoder(tvb_new_subset_remaining(tvb, offset), pinfo, dsc_tree);
 118         }
 119         return tvb_captured_length(tvb);
 120 }
 121
 122 /* Register Wimax Mac Payload Protocol and Dissector */
 123 void proto_register_mac_mgmt_msg_dsc(void)
 124 {
 125         /* DSx display */
 126         static hf_register_info hf[] =
 127         {
 128                 {
 129                         &hf_dsc_confirmation_code,
 130                         {
 131                                 "Confirmation code", "wmx.dsc.confirmation_code",
 132                                 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
 133                         }
 134                 },
 135                 {
 136                         &hf_dsc_transaction_id,
 137                         {
 138                                 "Transaction ID", "wmx.dsc.transaction_id",
 139                                 FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL
 140                         }
 141                 }
 142         };
 143
 144         /* Setup protocol subtree array */
 145         static int *ett[] =
 146                 {
 147                         &ett_mac_mgmt_msg_dsc_req_decoder,
 148                         &ett_mac_mgmt_msg_dsc_rsp_decoder,
 149                         &ett_mac_mgmt_msg_dsc_ack_decoder
 150                 };
 151
 152         proto_mac_mgmt_msg_dsc_decoder = proto_register_protocol (
 153                 "WiMax DSC Messages", /* name       */
 154                 "WiMax DSC",     /* short name */
 155                 "wmx.dsc"        /* abbrev     */
 156                 );
 157
 158         proto_register_field_array(proto_mac_mgmt_msg_dsc_decoder, hf, array_length(hf));
 159         proto_register_subtree_array(ett, array_length(ett));
 160
 161         dsc_req_handle = register_dissector("mac_mgmt_msg_dsc_req_handler", dissect_mac_mgmt_msg_dsc_req_decoder, proto_mac_mgmt_msg_dsc_decoder);
 162         dsc_rsp_handle = register_dissector("mac_mgmt_msg_dsc_rsp_handler", dissect_mac_mgmt_msg_dsc_rsp_decoder, proto_mac_mgmt_msg_dsc_decoder);
 163         dsc_ack_handle = register_dissector("mac_mgmt_msg_dsc_ack_handler", dissect_mac_mgmt_msg_dsc_ack_decoder, proto_mac_mgmt_msg_dsc_decoder);
 164 }
 165
 166 void
 167 proto_reg_handoff_mac_mgmt_msg_dsc(void)
 168 {
 169         dissector_add_uint("wmx.mgmtmsg", MAC_MGMT_MSG_DSC_REQ, dsc_req_handle);
 170         dissector_add_uint("wmx.mgmtmsg", MAC_MGMT_MSG_DSC_RSP, dsc_rsp_handle);
 171         dissector_add_uint("wmx.mgmtmsg", MAC_MGMT_MSG_DSC_ACK, dsc_ack_handle);
 172 }
 173
 174 /*
 175  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 176  *
 177  * Local variables:
 178  * c-basic-offset: 8
 179  * tab-width: 8
 180  * indent-tabs-mode: t
 181  * End:
 182  *
 183  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 184  * :indentSize=8:tabSize=8:noTabs=false:
 185  */