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wireshark/epan/dissectors/asn1/ranap/packet-ranap-template.c

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/* packet-ranap.c
* Routines for UMTS Node B Application Part(RANAP) packet dissection
* Copyright 2005 - 2010, Anders Broman <anders.broman[AT]ericsson.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 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.
*
* References: 3GPP TS 25.413 version 10.4.0 Release 10
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/strutil.h>
#include <epan/asn1.h>
#include <epan/prefs.h>
#include <epan/proto_data.h>
#include "packet-ber.h"
#include "packet-per.h"
#include "packet-gsm_map.h"
#include "packet-ranap.h"
#include "packet-e212.h"
#include "packet-sccp.h"
#include "packet-gsm_a_common.h"
#include "packet-isup.h"
#include "packet-s1ap.h"
#ifdef _MSC_VER
/* disable: "warning C4146: unary minus operator applied to unsigned type, result still unsigned" */
#pragma warning(disable:4146)
#endif
#define SCCP_SSN_RANAP 142
#define PNAME "Radio Access Network Application Part"
#define PSNAME "RANAP"
#define PFNAME "ranap"
/* Highest Ranap_ProcedureCode_value, use in heuristics */
#define RANAP_MAX_PC 45 /* id_RANAPenhancedRelocation = 45 */
#include "packet-ranap-val.h"
void proto_register_ranap(void);
void proto_reg_handoff_ranap(void);
/* Initialize the protocol and registered fields */
static int proto_ranap = -1;
/* initialise sub-dissector handles */
static dissector_handle_t rrc_s_to_trnc_handle = NULL;
static dissector_handle_t rrc_t_to_srnc_handle = NULL;
static dissector_handle_t rrc_ho_to_utran_cmd = NULL;
static int hf_ranap_transportLayerAddress_ipv4 = -1;
static int hf_ranap_transportLayerAddress_ipv6 = -1;
static int hf_ranap_transportLayerAddress_nsap = -1;
#include "packet-ranap-hf.c"
/* Initialize the subtree pointers */
static int ett_ranap = -1;
static int ett_ranap_TransportLayerAddress = -1;
static int ett_ranap_TransportLayerAddress_nsap = -1;
#include "packet-ranap-ett.c"
/* Global variables */
static guint32 ProcedureCode;
static guint32 ProtocolIE_ID;
static guint32 ProtocolExtensionID;
static gboolean glbl_dissect_container = FALSE;
static dissector_handle_t ranap_handle;
/* Some IE:s identities uses the same value for different IE:s
* depending on PDU type:
* InitiatingMessage
* SuccessfulOutcome
* UnsuccessfulOutcome
* Outcome
* As a workarond a value is added to the IE:id in the .cnf file.
* Example:
* ResetResourceList N rnsap.ies IMSG||id-IuSigConIdList # no spaces are allowed in value as a space is delimiter
* PDU type is stored in a global variable and can is used in the IE decoding section.
*/
/*
* &InitiatingMessage ,
* &SuccessfulOutcome OPTIONAL,
* &UnsuccessfulOutcome OPTIONAL,
* &Outcome OPTIONAL,
*
* Only these two needed currently
*/
#define IMSG (1U<<16)
#define SOUT (2U<<16)
#define SPECIAL (4U<<16)
int pdu_type = 0; /* 0 means wildcard */
/* Initialise the Preferences */
static gint global_ranap_sccp_ssn = SCCP_SSN_RANAP;
/* Dissector tables */
static dissector_table_t ranap_ies_dissector_table;
static dissector_table_t ranap_ies_p1_dissector_table;
static dissector_table_t ranap_ies_p2_dissector_table;
static dissector_table_t ranap_extension_dissector_table;
static dissector_table_t ranap_proc_imsg_dissector_table;
static dissector_table_t ranap_proc_sout_dissector_table;
static dissector_table_t ranap_proc_uout_dissector_table;
static dissector_table_t ranap_proc_out_dissector_table;
static dissector_table_t nas_pdu_dissector_table;
static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_ProtocolIEFieldPairFirstValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_ProtocolIEFieldPairSecondValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_OutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_ranap_SourceRNC_ToTargetRNC_TransparentContainer(tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index);
static int dissect_ranap_TargetRNC_ToSourceRNC_TransparentContainer(tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index);
#include "packet-ranap-fn.c"
static int
dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
int ret = 0;
int key;
/* Special handling, same ID used for different IE's depending on signal */
switch(ProcedureCode){
case id_RelocationPreparation:
if((ProtocolIE_ID == id_Source_ToTarget_TransparentContainer)||(ProtocolIE_ID == id_Target_ToSource_TransparentContainer)){
key = SPECIAL | ProtocolIE_ID;
ret = (dissector_try_uint_new(ranap_ies_dissector_table, key, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
break;
}
/* Fall through */
default:
/* no special handling */
ret = (dissector_try_uint_new(ranap_ies_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
if (ret == 0) {
key = pdu_type | ProtocolIE_ID;
ret = (dissector_try_uint_new(ranap_ies_dissector_table, key, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
break;
}
return ret;
}
static int
dissect_ProtocolIEFieldPairFirstValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint_new(ranap_ies_p1_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int
dissect_ProtocolIEFieldPairSecondValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint_new(ranap_ies_p2_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int
dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint_new(ranap_extension_dissector_table, ProtocolExtensionID, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int
dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
gboolean ret;
pdu_type = IMSG;
ret = dissector_try_uint_new(ranap_proc_imsg_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE, NULL);
pdu_type = 0;
return ret ? tvb_captured_length(tvb) : 0;
}
static int
dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
gboolean ret;
pdu_type = SOUT;
ret = dissector_try_uint_new(ranap_proc_sout_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE, NULL);
pdu_type = 0;
return ret ? tvb_captured_length(tvb) : 0;
}
static int
dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint_new(ranap_proc_uout_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int
dissect_OutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint_new(ranap_proc_out_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int
dissect_ranap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
proto_item *ranap_item = NULL;
proto_tree *ranap_tree = NULL;
sccp_msg_info_t *sccp_msg_lcl = (sccp_msg_info_t *)data;
pdu_type = 0;
ProtocolIE_ID = 0;
/* make entry in the Protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RANAP");
/* create the ranap protocol tree */
ranap_item = proto_tree_add_item(tree, proto_ranap, tvb, 0, -1, ENC_NA);
ranap_tree = proto_item_add_subtree(ranap_item, ett_ranap);
/* Save the sccp_msg_info_t data (if present) because it can't be passed
through function calls */
p_add_proto_data(pinfo->pool, pinfo, proto_ranap, pinfo->curr_layer_num, data);
dissect_RANAP_PDU_PDU(tvb, pinfo, ranap_tree, NULL);
if (sccp_msg_lcl) {
if (sccp_msg_lcl->data.co.assoc)
sccp_msg_lcl->data.co.assoc->payload = SCCP_PLOAD_RANAP;
if (! sccp_msg_lcl->data.co.label && ProcedureCode != 0xFFFFFFFF) {
const gchar* str = val_to_str(ProcedureCode, ranap_ProcedureCode_vals,"Unknown RANAP");
sccp_msg_lcl->data.co.label = wmem_strdup(wmem_file_scope(), str);
}
}
return tvb_reported_length(tvb);
}
#define RANAP_MSG_MIN_LENGTH 7
static gboolean
dissect_sccp_ranap_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
guint8 temp;
guint16 word;
asn1_ctx_t asn1_ctx;
guint length;
int offset;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
/* Is it a ranap packet?
*
* 4th octet should be the length of the rest of the message.
* 2nd octet is the message-type e Z[0, 28]
* (obviously there must be at least four octets)
*
* If both hold true we'll assume it's RANAP
*/
#define LENGTH_OFFSET 3
#define MSG_TYPE_OFFSET 1
if (tvb_captured_length(tvb) < RANAP_MSG_MIN_LENGTH) { return FALSE; }
/* Read the length NOTE offset in bits */
offset = dissect_per_length_determinant(tvb, LENGTH_OFFSET<<3, &asn1_ctx, tree, -1, &length);
offset = offset>>3;
if (length!= (tvb_reported_length(tvb) - offset)){
return FALSE;
}
temp = tvb_get_guint8(tvb, MSG_TYPE_OFFSET);
if (temp > RANAP_MAX_PC) { return FALSE; }
/* Try to strengthen the heuristic further, by checking the byte following the length and the bitfield indicating extensions etc
* which usually is a sequence-of length
*/
word = tvb_get_ntohs(tvb, offset + 1);
if (word > 0x1ff){
return FALSE;
}
dissect_ranap(tvb, pinfo, tree, data);
return TRUE;
}
/*--- proto_register_ranap -------------------------------------------*/
void proto_register_ranap(void) {
module_t *ranap_module;
/* List of fields */
static hf_register_info hf[] = {
{ &hf_ranap_transportLayerAddress_ipv4,
{ "transportLayerAddress IPv4", "ranap.transportLayerAddress_ipv4",
FT_IPv4, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_ranap_transportLayerAddress_ipv6,
{ "transportLayerAddress IPv6", "ranap.transportLayerAddress_ipv6",
FT_IPv6, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_ranap_transportLayerAddress_nsap,
{ "transportLayerAddress NSAP", "ranap.transportLayerAddress_NSAP",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }},
#include "packet-ranap-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_ranap,
&ett_ranap_TransportLayerAddress,
&ett_ranap_TransportLayerAddress_nsap,
#include "packet-ranap-ettarr.c"
};
/* Register protocol */
proto_ranap = proto_register_protocol(PNAME, PSNAME, PFNAME);
/* Register fields and subtrees */
proto_register_field_array(proto_ranap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register dissector */
ranap_handle = register_dissector("ranap", dissect_ranap, proto_ranap);
/* Register dissector tables */
ranap_ies_dissector_table = register_dissector_table("ranap.ies", "RANAP-PROTOCOL-IES", proto_ranap, FT_UINT32, BASE_DEC);
ranap_ies_p1_dissector_table = register_dissector_table("ranap.ies.pair.first", "RANAP-PROTOCOL-IES-PAIR FirstValue", proto_ranap, FT_UINT32, BASE_DEC);
ranap_ies_p2_dissector_table = register_dissector_table("ranap.ies.pair.second", "RANAP-PROTOCOL-IES-PAIR SecondValue", proto_ranap, FT_UINT32, BASE_DEC);
ranap_extension_dissector_table = register_dissector_table("ranap.extension", "RANAP-PROTOCOL-EXTENSION", proto_ranap, FT_UINT32, BASE_DEC);
ranap_proc_imsg_dissector_table = register_dissector_table("ranap.proc.imsg", "RANAP-ELEMENTARY-PROCEDURE InitiatingMessage", proto_ranap, FT_UINT32, BASE_DEC);
ranap_proc_sout_dissector_table = register_dissector_table("ranap.proc.sout", "RANAP-ELEMENTARY-PROCEDURE SuccessfulOutcome", proto_ranap, FT_UINT32, BASE_DEC);
ranap_proc_uout_dissector_table = register_dissector_table("ranap.proc.uout", "RANAP-ELEMENTARY-PROCEDURE UnsuccessfulOutcome", proto_ranap, FT_UINT32, BASE_DEC);
ranap_proc_out_dissector_table = register_dissector_table("ranap.proc.out", "RANAP-ELEMENTARY-PROCEDURE Outcome", proto_ranap, FT_UINT32, BASE_DEC);
nas_pdu_dissector_table = register_dissector_table("ranap.nas_pdu", "RANAP NAS PDU", proto_ranap, FT_UINT8, BASE_DEC);
ranap_module = prefs_register_protocol(proto_ranap, proto_reg_handoff_ranap);
prefs_register_uint_preference(ranap_module, "sccp_ssn", "SCCP SSN for RANAP",
"The SCCP SubSystem Number for RANAP (default 142)", 10,
&global_ranap_sccp_ssn);
prefs_register_bool_preference(ranap_module, "dissect_rrc_container",
"Attempt to dissect RRC-Container",
"Attempt to dissect RRC message embedded in RRC-Container IE",
&glbl_dissect_container);
}
/*--- proto_reg_handoff_ranap ---------------------------------------*/
void
proto_reg_handoff_ranap(void)
{
static gboolean initialized = FALSE;
static gint local_ranap_sccp_ssn;
if (!initialized) {
rrc_s_to_trnc_handle = find_dissector_add_dependency("rrc.s_to_trnc_cont", proto_ranap);
rrc_t_to_srnc_handle = find_dissector_add_dependency("rrc.t_to_srnc_cont", proto_ranap);
rrc_ho_to_utran_cmd = find_dissector_add_dependency("rrc.irat.ho_to_utran_cmd", proto_ranap);
initialized = TRUE;
#include "packet-ranap-dis-tab.c"
} else {
dissector_delete_uint("sccp.ssn", local_ranap_sccp_ssn, ranap_handle);
}
dissector_add_uint("sccp.ssn", global_ranap_sccp_ssn, ranap_handle);
local_ranap_sccp_ssn = global_ranap_sccp_ssn;
heur_dissector_add("sccp", dissect_sccp_ranap_heur, "RANAP over SCCP", "ranap_sccp", proto_ranap, HEURISTIC_ENABLE);
heur_dissector_add("sua", dissect_sccp_ranap_heur, "RANAP over SUA", "ranap_sua", proto_ranap, HEURISTIC_ENABLE);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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