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wireshark/plugins/wimax/mac_mgmt_msg_decoder.c
Guy Harris a4c8ebc18b Don't do any Decode As stuff for dissector tables not used with Decode As. 
Have all dissector tables have a "supports Decode As" flag, which
defaults to FALSE, and which is set to TRUE if a register_decode_as()
refers to it.

When adding a dissector to a dissector table with a given key, only add
it for Decode As if the dissector table supports it.

For non-FT_STRING dissector tables, always check for multiple entries
for the same protocol with different dissectors, and report an error if
we found them.

This means there's no need for the creator of a dissector table to
specify whether duplicates of that sort should be allowed - we always do
the check when registering something for "Decode As" (in a non-FT_STRING
dissector table), and just don't bother registering anything for "Decode
As" if the dissector table doesn't support "Decode As", so there's no
check done for those dissector tables.

Change-Id: I4a1fdea3bddc2af27a65cfbca23edc99b26c0eed
Reviewed-on: https://code.wireshark.org/review/17402
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2016-08-31 00:08:01 +00:00

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/* mac_mgmt_msg_decoder.c
* WiMax MAC Management Message decoder
*
* Copyright (c) 2007 by Intel Corporation.
*
* Author: Lu Pan <lu.pan@intel.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Include files */
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include "wimax_mac.h"
void proto_register_mac_mgmt_msg(void);
void proto_reg_handoff_mac_mgmt_msg(void);
static gint proto_mac_mgmt_msg_decoder = -1;
static gint ett_mac_mgmt_msg_decoder = -1;
static gint hf_mac_mgmt_msg_type = -1;
static gint hf_mac_mgmt_msg_values = -1;
static expert_field ei_empty_payload = EI_INIT;
static dissector_table_t subdissector_message_table;
/* WIMAX MAC Management message type info */
static const value_string mgt_msg_abbrv_vals[] = {
{ MAC_MGMT_MSG_UCD, "UCD" },
{ MAC_MGMT_MSG_DCD, "DCD" },
{ MAC_MGMT_MSG_DL_MAP, "DL-MAP" },
{ MAC_MGMT_MSG_UL_MAP, "UL-MAP" },
{ MAC_MGMT_MSG_RNG_REQ, "RNG-REQ" },
{ MAC_MGMT_MSG_RNG_RSP, "RNG-RSP" },
{ MAC_MGMT_MSG_REG_REQ, "REG-REQ" },
{ MAC_MGMT_MSG_REG_RSP, "REG-RSP" },
{ 8, "Reserved8" },
{ MAC_MGMT_MSG_PKM_REQ, "PKM-REQ" },
{ MAC_MGMT_MSG_PKM_RSP, "PKM-RSP" },
{ MAC_MGMT_MSG_DSA_REQ, "DSA-REQ" },
{ MAC_MGMT_MSG_DSA_RSP, "DSA-RSP" },
{ MAC_MGMT_MSG_DSA_ACK, "DSA-ACK" },
{ MAC_MGMT_MSG_DSC_REQ, "DSC-REQ" },
{ MAC_MGMT_MSG_DSC_RSP, "DSC-RSP" },
{ MAC_MGMT_MSG_DSC_ACK, "DSC-ACK" },
{ MAC_MGMT_MSG_DSD_REQ, "DSD-REQ" },
{ MAC_MGMT_MSG_DSD_RSP, "DSD-RSP" },
{ 19, "Reserved19" },
{ 20, "Reserved20" },
{ MAC_MGMT_MSG_MCA_REQ, "MCA-REQ" },
{ MAC_MGMT_MSG_MCA_RSP, "MCA-RSP" },
{ MAC_MGMT_MSG_DBPC_REQ, "DBPC-REQ" },
{ MAC_MGMT_MSG_DBPC_RSP, "DBPC-RSP" },
{ MAC_MGMT_MSG_RES_CMD, "RES-CMD" },
{ MAC_MGMT_MSG_SBC_REQ, "SBC-REQ" },
{ MAC_MGMT_MSG_SBC_RSP, "SBC-RSP" },
{ MAC_MGMT_MSG_CLK_CMP, "CLK-CMP" },
{ MAC_MGMT_MSG_DREG_CMD, "DREG-CMD" },
{ MAC_MGMT_MSG_DSX_RVD, "DSX-RVD" },
{ MAC_MGMT_MSG_TFTP_CPLT, "TFTP-CPLT" },
{ MAC_MGMT_MSG_TFTP_RSP, "TFTP-RSP" },
{ MAC_MGMT_MSG_ARQ_FEEDBACK, "ARQ-FEEDBACK" },
{ MAC_MGMT_MSG_ARQ_DISCARD, "ARQ-DISCARD" },
{ MAC_MGMT_MSG_ARQ_RESET, "ARQ-RESET" },
{ MAC_MGMT_MSG_REP_REQ, "REP-REQ" },
{ MAC_MGMT_MSG_REP_RSP, "REP-RSP" },
{ MAC_MGMT_MSG_FPC, "FPC" },
{ MAC_MGMT_MSG_MSH_NCFG, "MSH-NCFG" },
{ MAC_MGMT_MSG_MSH_NENT, "MSH-NENT" },
{ MAC_MGMT_MSG_MSH_DSCH, "MSH-DSCH" },
{ MAC_MGMT_MSG_MSH_CSCH, "MSH-CSCH" },
{ MAC_MGMT_MSG_MSH_CSCF, "MSH-CSCF" },
{ MAC_MGMT_MSG_AAS_FBCK_REQ, "AAS-FBCK_REQ" },
{ MAC_MGMT_MSG_AAS_FBCK_RSP, "AAS-FBCK_RSP" },
{ MAC_MGMT_MSG_AAS_BEAM_SELECT, "AAS-BEAM_SELECT" },
{ MAC_MGMT_MSG_AAS_BEAM_REQ, "AAS-BEAM_REQ" },
{ MAC_MGMT_MSG_AAS_BEAM_RSP, "AAS-BEAM_RSP" },
{ MAC_MGMT_MSG_DREG_REQ, "DREG-REQ" },
{ MAC_MGMT_MSG_MOB_SLP_REQ, "MOB-SLP-REQ" },
{ MAC_MGMT_MSG_MOB_SLP_RSP, "MOB-SLP-RSP" },
{ MAC_MGMT_MSG_MOB_TRF_IND, "MOB-TRF-IND" },
{ MAC_MGMT_MSG_MOB_NBR_ADV, "MOB-NBR-ADV" },
{ MAC_MGMT_MSG_MOB_SCN_REQ, "MOB-SCN-REQ" },
{ MAC_MGMT_MSG_MOB_SCN_RSP, "MOB-SCN-RSP" },
{ MAC_MGMT_MSG_MOB_BSHO_REQ, "MOB-BSHO-REQ" },
{ MAC_MGMT_MSG_MOB_MSHO_REQ, "MOB-MSHO-REQ" },
{ MAC_MGMT_MSG_MOB_BSHO_RSP, "MOB-BSHO-RSP" },
{ MAC_MGMT_MSG_MOB_HO_IND, "MOB-HO-IND" },
{ MAC_MGMT_MSG_MOB_SCN_REP, "MOB-SCN-REP" },
{ MAC_MGMT_MSG_MOB_PAG_ADV, "MOB-PAG-ADV" },
{ MAC_MGMT_MSG_MBS_MAP, "MBS-MAP" },
{ MAC_MGMT_MSG_PMC_REQ, "PMC-REQ" },
{ MAC_MGMT_MSG_PMC_RSP, "PMC-RSP" },
{ MAC_MGMT_MSG_PRC_LT_CTRL, "PRC-LT-CTRL" },
{ MAC_MGMT_MSG_MOB_ASC_REP, "MOB-ASC-REP" },
{ 0, NULL }
};
static value_string_ext mgt_msg_abbrv_vals_ext = VALUE_STRING_EXT_INIT(mgt_msg_abbrv_vals);
static int dissect_mac_mgmt_msg_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
guint offset = 0;
guint message_type;
proto_item *message_item;
proto_tree *message_tree;
const char* mgt_msg_str;
message_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_decoder, tvb, offset, -1,
"MAC Management Message Type (%u bytes)", tvb_reported_length(tvb));
message_tree = proto_item_add_subtree(message_item, ett_mac_mgmt_msg_decoder);
if (tvb_reported_length(tvb) == 0)
{
expert_add_info(pinfo, message_item, &ei_empty_payload);
return tvb_captured_length(tvb);
}
/* Get the payload type */
message_type = tvb_get_guint8(tvb, offset);
proto_tree_add_item(message_tree, hf_mac_mgmt_msg_type, tvb, offset, 1, ENC_NA);
mgt_msg_str = val_to_str_ext_const(message_type, &mgt_msg_abbrv_vals_ext, "Unknown");
/* Display message type in Info column */
col_append_sep_str(pinfo->cinfo, COL_INFO, ", ", mgt_msg_str);
/* add the payload type into the info column */
if (try_val_to_str_ext(message_type, &mgt_msg_abbrv_vals_ext) == NULL)
{
/* display the MAC payload in Hex */
proto_tree_add_item(message_tree, hf_mac_mgmt_msg_values, tvb, offset, -1, ENC_NA);
return 1;
}
/* add the MAC header info to parent*/
proto_item_append_text(proto_tree_get_parent(tree), ", %s", mgt_msg_str);
/* Decode and display the MAC payload */
if (!dissector_try_uint(subdissector_message_table, message_type,
tvb_new_subset_remaining(tvb, 1), pinfo, tree))
{
proto_tree_add_item(message_tree, hf_mac_mgmt_msg_values, tvb, offset, -1, ENC_NA);
}
return tvb_captured_length(tvb);
}
/* Register Wimax Mac Payload Protocol and Dissector */
void proto_register_mac_mgmt_msg(void)
{
/* Payload display */
static hf_register_info hf[] =
{
{
&hf_mac_mgmt_msg_type,
{
"MAC Management Message Type", "wmx.macmgtmsgtype",
FT_UINT8, BASE_DEC | BASE_EXT_STRING, &mgt_msg_abbrv_vals_ext, 0x0,
NULL, HFILL
}
},
{
&hf_mac_mgmt_msg_values,
{
"Values", "wmx.values",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL
}
},
};
/* Setup protocol subtree array */
static gint *ett[] =
{
&ett_mac_mgmt_msg_decoder,
};
static ei_register_info ei[] = {
{ &ei_empty_payload, { "wmx.empty_payload", PI_PROTOCOL, PI_ERROR, "Error: Mac payload tvb is empty !", EXPFILL }},
};
expert_module_t* expert_mac_mgmt;
proto_mac_mgmt_msg_decoder = proto_register_protocol (
"WiMax MAC Management Message", /* name */
"MGMT MSG", /* short name */
"wmx.mgmt" /* abbrev */
);
proto_register_field_array(proto_mac_mgmt_msg_decoder, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_mac_mgmt = expert_register_protocol(proto_mac_mgmt_msg_decoder);
expert_register_field_array(expert_mac_mgmt, ei, array_length(ei));
subdissector_message_table = register_dissector_table("wmx.mgmtmsg",
"WiMax MAC Management Message", proto_mac_mgmt_msg_decoder, FT_UINT8, BASE_DEC);
/* Register dissector by name */
register_dissector("wmx_mac_mgmt_msg_decoder", dissect_mac_mgmt_msg_decoder,
proto_mac_mgmt_msg_decoder);
}
void proto_reg_handoff_mac_mgmt_msg(void)
{
dissector_handle_t mgt_msg_handle;
/* Find the dissectors that appear to be supported through a third-party plugin
Keep here until third-party plugin can register through the new "wmx.mgmtmsg"
subdissector */
/* find the Multicast Assignment request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mca_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MCA_REQ, mgt_msg_handle );
/* find the Multicast Assignment response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mca_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MCA_RSP, mgt_msg_handle );
/* find the DL Burst Profile Change request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_dbpc_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_DBPC_REQ, mgt_msg_handle );
/* find the DL Burst Profile Change response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_dbpc_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_DBPC_RSP, mgt_msg_handle );
/* find the Config File TFTP Complete message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_tftp_cplt_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_TFTP_CPLT, mgt_msg_handle );
/* find the Config File TFTP Complete response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_tftp_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_TFTP_RSP, mgt_msg_handle );
/* find the Mesh Network Configuration message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_ncfg_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MSH_NCFG, mgt_msg_handle );
/* find the Mesh Network Entry message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_nent_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MSH_NENT, mgt_msg_handle );
/* find the Mesh Distributed Schedule message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_dsch_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MSH_DSCH, mgt_msg_handle );
/* find the Mesh Centralized Schedule message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_csch_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MSH_CSCH, mgt_msg_handle );
/* find the Mesh Centralized Schedule Configuration message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_cscf_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MSH_CSCF, mgt_msg_handle );
/* find the AAS Beam request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_aas_beam_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_AAS_BEAM_REQ, mgt_msg_handle );
/* find the AAS Beam response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_aas_beam_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_AAS_BEAM_RSP, mgt_msg_handle );
/* find the Sleep Request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_slp_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_SLP_REQ, mgt_msg_handle );
/* find the Sleep Response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_slp_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_SLP_RSP, mgt_msg_handle );
/* find the Traffic Indication message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_trf_ind_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_TRF_IND, mgt_msg_handle );
/* find the Neighbor Advertisement message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_nbr_adv_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_NBR_ADV, mgt_msg_handle );
/* find the Scanning Interval Allocation Request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_scn_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_SCN_REQ, mgt_msg_handle );
/* find the Scanning Interval Allocation Response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_scn_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_SCN_RSP, mgt_msg_handle );
/* find the BS HO Request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_bsho_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_BSHO_REQ, mgt_msg_handle );
/* find the MS HO Request message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_msho_req_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_MSHO_REQ, mgt_msg_handle );
/* find the BS HO Response message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_bsho_rsp_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_BSHO_RSP, mgt_msg_handle );
/* find the HO Indication message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_ho_ind_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_HO_IND, mgt_msg_handle );
/* find the Scanning Result Report message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_scn_rep_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_SCN_REP, mgt_msg_handle );
/* find the BS Broadcast Paging message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_pag_adv_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_PAG_ADV, mgt_msg_handle );
/* find the MBS MAP message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mbs_map_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MBS_MAP, mgt_msg_handle );
/* find the Association Result Report message handler */
mgt_msg_handle = find_dissector("mac_mgmt_msg_mob_asc_rep_handler");
if (mgt_msg_handle)
dissector_add_uint( "wmx.mgmtmsg", MAC_MGMT_MSG_MOB_ASC_REP, mgt_msg_handle );
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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