forked from osmocom/wireshark
366 lines
13 KiB
C
366 lines
13 KiB
C
/* packet-ranap.c
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* Routines for UMTS Node B Application Part(RANAP) packet dissection
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* Copyright 2005 - 2010, Anders Broman <anders.broman[AT]ericsson.com>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* References: 3GPP TS 25.413 version 6.6.0 Release
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/emem.h>
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#include <epan/strutil.h>
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#include <epan/asn1.h>
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#include <epan/prefs.h>
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#include "packet-ber.h"
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#include "packet-per.h"
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#include "packet-gsm_map.h"
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#include "packet-ranap.h"
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#include "packet-e212.h"
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#include "packet-sccp.h"
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#include "packet-gsm_a_common.h"
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#ifdef _MSC_VER
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/* disable: "warning C4146: unary minus operator applied to unsigned type, result still unsigned" */
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#pragma warning(disable:4146)
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#endif
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#define SCCP_SSN_RANAP 142
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#define PNAME "Radio Access Network Application Part"
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#define PSNAME "RANAP"
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#define PFNAME "ranap"
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/* Higest Ranap_ProcedureCode_value, use in heuristics */
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#define RANAP_MAX_PC 45 /* id_RANAPenhancedRelocation = 45 */
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#include "packet-ranap-val.h"
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/* Initialize the protocol and registered fields */
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static int proto_ranap = -1;
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/* initialise sub-dissector handles */
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static dissector_handle_t rrc_s_to_trnc_handle = NULL;
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static dissector_handle_t rrc_ho_to_utran_cmd = NULL;
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static int hf_ranap_imsi_digits = -1;
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static int hf_ranap_transportLayerAddress_ipv4 = -1;
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static int hf_ranap_transportLayerAddress_ipv6 = -1;
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#include "packet-ranap-hf.c"
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/* Initialize the subtree pointers */
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static int ett_ranap = -1;
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static int ett_ranap_TransportLayerAddress = -1;
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#include "packet-ranap-ett.c"
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/* Global variables */
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static guint32 ProcedureCode;
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static guint32 ProtocolIE_ID;
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static guint32 ProtocolExtensionID;
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/* Some IE:s identities uses the same value for different IE:s
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* depending on PDU type:
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* InitiatingMessage
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* SuccessfulOutcome
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* UnsuccessfulOutcome
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* Outcome
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* As a workarond a value is added to the IE:id in the .cnf file.
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* Example:
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* ResetResourceList N rnsap.ies IMSG||id-IuSigConIdList # no spaces are allowed in value as a space is delimiter
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* PDU type is stored in a global variable and can is used in the IE decoding section.
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*/
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/*
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* &InitiatingMessage ,
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* &SuccessfulOutcome OPTIONAL,
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* &UnsuccessfulOutcome OPTIONAL,
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* &Outcome OPTIONAL,
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*
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* Only these two needed currently
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*/
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#define IMSG (1<<16)
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#define SOUT (2<<16)
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#define SPECIAL (4<<16)
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int pdu_type = 0; /* 0 means wildcard */
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/* Initialise the Preferences */
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static gint global_ranap_sccp_ssn = SCCP_SSN_RANAP;
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/* Dissector tables */
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static dissector_table_t ranap_ies_dissector_table;
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static dissector_table_t ranap_ies_p1_dissector_table;
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static dissector_table_t ranap_ies_p2_dissector_table;
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static dissector_table_t ranap_extension_dissector_table;
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static dissector_table_t ranap_proc_imsg_dissector_table;
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static dissector_table_t ranap_proc_sout_dissector_table;
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static dissector_table_t ranap_proc_uout_dissector_table;
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static dissector_table_t ranap_proc_out_dissector_table;
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static dissector_table_t nas_pdu_dissector_table;
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static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_ProtocolIEFieldPairFirstValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_ProtocolIEFieldPairSecondValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_OutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_ranap_SourceRNC_ToTargetRNC_TransparentContainer(tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index);
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static int dissect_ranap_TargetRNC_ToSourceRNC_TransparentContainer(tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index);
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void proto_reg_handoff_ranap(void);
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#include "packet-ranap-fn.c"
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static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int ret = 0;
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int key;
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/* Special handling, same ID used for different IE's depending on signal */
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switch(ProcedureCode){
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case id_RelocationPreparation:
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if((ProtocolIE_ID == id_Source_ToTarget_TransparentContainer)||(ProtocolIE_ID == id_Target_ToSource_TransparentContainer)){
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key = SPECIAL | ProtocolIE_ID;
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ret = (dissector_try_uint_new(ranap_ies_dissector_table, key, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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break;
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}
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/* Fall trough */
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default:
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/* no special handling */
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ret = (dissector_try_uint_new(ranap_ies_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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if (ret == 0) {
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key = pdu_type | ProtocolIE_ID;
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ret = (dissector_try_uint_new(ranap_ies_dissector_table, key, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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}
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break;
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}
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return ret;
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}
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static int dissect_ProtocolIEFieldPairFirstValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return (dissector_try_uint_new(ranap_ies_p1_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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}
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static int dissect_ProtocolIEFieldPairSecondValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return (dissector_try_uint_new(ranap_ies_p2_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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}
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static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return (dissector_try_uint_new(ranap_extension_dissector_table, ProtocolExtensionID, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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}
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static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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pdu_type = IMSG;
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return (dissector_try_uint_new(ranap_proc_imsg_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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pdu_type = 0;
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}
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static int dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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pdu_type = SOUT;
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return (dissector_try_uint_new(ranap_proc_sout_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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pdu_type = 0;
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}
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static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return (dissector_try_uint_new(ranap_proc_uout_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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}
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static int dissect_OutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return (dissector_try_uint_new(ranap_proc_out_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
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}
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static void
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dissect_ranap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ranap_item = NULL;
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proto_tree *ranap_tree = NULL;
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pdu_type = 0;
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ProtocolIE_ID = 0;
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/* make entry in the Protocol column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RANAP");
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/* create the ranap protocol tree */
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ranap_item = proto_tree_add_item(tree, proto_ranap, tvb, 0, -1, FALSE);
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ranap_tree = proto_item_add_subtree(ranap_item, ett_ranap);
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dissect_RANAP_PDU_PDU(tvb, pinfo, ranap_tree);
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if (pinfo->sccp_info) {
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sccp_msg_info_t* sccp_msg_lcl = pinfo->sccp_info;
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if (sccp_msg_lcl->data.co.assoc)
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sccp_msg_lcl->data.co.assoc->payload = SCCP_PLOAD_RANAP;
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if (! sccp_msg_lcl->data.co.label && ProcedureCode != 0xFFFFFFFF) {
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const gchar* str = val_to_str(ProcedureCode, ranap_ProcedureCode_vals,"Unknown RANAP");
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sccp_msg_lcl->data.co.label = se_strdup(str);
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}
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}
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}
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static gboolean
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dissect_sccp_ranap_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 temp;
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asn1_ctx_t asn1_ctx;
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guint length;
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int offset;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
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/* Is it a ranap packet?
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*
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* 4th octet should be the length of the rest of the message.
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* 2nd octet is the message-type e Z[0, 28]
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* (obviously there must be at least four octets)
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*
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* If both hold true we'll assume its RANAP
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*/
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#define LENGTH_OFFSET 3
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#define MSG_TYPE_OFFSET 1
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if (tvb_length(tvb) < 4) { return FALSE; }
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/*if (tvb_get_guint8(tvb, LENGTH_OFFSET) != (tvb_length(tvb) - 4)) { return FALSE; }*/
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/* Read the length NOTE offset in bits */
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offset = dissect_per_length_determinant(tvb, LENGTH_OFFSET<<3, &asn1_ctx, tree, -1, &length);
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offset = offset>>3;
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if (length!= (tvb_length(tvb) - offset)){
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return FALSE;
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}
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temp = tvb_get_guint8(tvb, MSG_TYPE_OFFSET);
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if (temp > RANAP_MAX_PC) { return FALSE; }
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dissect_ranap(tvb, pinfo, tree);
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return TRUE;
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}
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/*--- proto_register_ranap -------------------------------------------*/
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void proto_register_ranap(void) {
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module_t *ranap_module;
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_ranap_imsi_digits,
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{ "IMSI digits", "ranap.imsi_digits",
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FT_STRING, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_ranap_transportLayerAddress_ipv4,
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{ "transportLayerAddress IPv4", "ranap.transportLayerAddress_ipv4",
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FT_IPv4, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_ranap_transportLayerAddress_ipv6,
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{ "transportLayerAddress IPv6", "ranap.transportLayerAddress_ipv6",
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FT_IPv6, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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#include "packet-ranap-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_ranap,
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&ett_ranap_TransportLayerAddress,
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#include "packet-ranap-ettarr.c"
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};
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/* Register protocol */
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proto_ranap = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_ranap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register dissector */
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register_dissector("ranap", dissect_ranap, proto_ranap);
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/* Register dissector tables */
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ranap_ies_dissector_table = register_dissector_table("ranap.ies", "RANAP-PROTOCOL-IES", FT_UINT32, BASE_DEC);
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ranap_ies_p1_dissector_table = register_dissector_table("ranap.ies.pair.first", "RANAP-PROTOCOL-IES-PAIR FirstValue", FT_UINT32, BASE_DEC);
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ranap_ies_p2_dissector_table = register_dissector_table("ranap.ies.pair.second", "RANAP-PROTOCOL-IES-PAIR SecondValue", FT_UINT32, BASE_DEC);
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ranap_extension_dissector_table = register_dissector_table("ranap.extension", "RANAP-PROTOCOL-EXTENSION", FT_UINT32, BASE_DEC);
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ranap_proc_imsg_dissector_table = register_dissector_table("ranap.proc.imsg", "RANAP-ELEMENTARY-PROCEDURE InitiatingMessage", FT_UINT32, BASE_DEC);
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ranap_proc_sout_dissector_table = register_dissector_table("ranap.proc.sout", "RANAP-ELEMENTARY-PROCEDURE SuccessfulOutcome", FT_UINT32, BASE_DEC);
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ranap_proc_uout_dissector_table = register_dissector_table("ranap.proc.uout", "RANAP-ELEMENTARY-PROCEDURE UnsuccessfulOutcome", FT_UINT32, BASE_DEC);
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ranap_proc_out_dissector_table = register_dissector_table("ranap.proc.out", "RANAP-ELEMENTARY-PROCEDURE Outcome", FT_UINT32, BASE_DEC);
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nas_pdu_dissector_table = register_dissector_table("ranap.nas_pdu", "RANAP NAS PDU", FT_UINT8, BASE_DEC);
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ranap_module = prefs_register_protocol(proto_ranap, proto_reg_handoff_ranap);
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prefs_register_uint_preference(ranap_module, "sccp_ssn", "SCCP SSN for RANAP",
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"The SCCP SubSystem Number for RANAP (default 142)", 10,
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&global_ranap_sccp_ssn);
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}
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/*--- proto_reg_handoff_ranap ---------------------------------------*/
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void
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proto_reg_handoff_ranap(void)
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{
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static gboolean initialized = FALSE;
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static dissector_handle_t ranap_handle;
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static gint local_ranap_sccp_ssn;
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if (!initialized) {
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ranap_handle = find_dissector("ranap");
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rrc_s_to_trnc_handle = find_dissector("rrc.s_to_trnc_cont");
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rrc_ho_to_utran_cmd = find_dissector("rrc.irat.ho_to_utran_cmd");
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initialized = TRUE;
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#include "packet-ranap-dis-tab.c"
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} else {
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dissector_delete_uint("sccp.ssn", local_ranap_sccp_ssn, ranap_handle);
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}
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dissector_add_uint("sccp.ssn", global_ranap_sccp_ssn, ranap_handle);
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local_ranap_sccp_ssn = global_ranap_sccp_ssn;
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/* Add heuristic dissector
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* Perhaps we want a preference whether the heuristic dissector
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* is or isn't enabled
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*/
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heur_dissector_add("sccp", dissect_sccp_ranap_heur, proto_ranap);
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heur_dissector_add("sua", dissect_sccp_ranap_heur, proto_ranap);
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}
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