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/* packet-sbap.c
* Routines for UTRAN Iu-BC Interface: Service Area Broadcast Protocol (SBAP) packet dissection
* Copyright 2007, Tomas Kukosa <tomas.kukosa@siemens.com>
*
* $Id$
*
* 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.
*
* Ref: 3GPP TS 25.419 version V9.0.0 (2009-12)
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include <epan/asn1.h>
#include "packet-tcp.h"
#include "packet-per.h"
#include "packet-e212.h"
#include "packet-gsm_map.h"
#include "packet-gsm_sms.h"
#include <epan/sctpppids.h>
#include "packet-cell_broadcast.h"
#define PNAME "UTRAN IuBC interface SABP signaling"
#define PSNAME "SABP"
#define PFNAME "sabp"
#include "packet-sabp-val.h"
void proto_register_sabp(void);
void proto_reg_handoff_sabp(void);
/* Initialize the protocol and registered fields */
static int proto_sabp = -1;
static int hf_sabp_no_of_pages = -1;
static int hf_sabp_cb_inf_len = -1;
static int hf_sabp_cb_msg_inf_page = -1;
static int hf_sabp_cbs_page_content = -1;
#include "packet-sabp-hf.c"
/* Initialize the subtree pointers */
static int ett_sabp = -1;
static int ett_sabp_e212 = -1;
static int ett_sabp_cbs_data_coding = -1;
static int ett_sabp_bcast_msg = -1;
static int ett_sabp_cbs_serial_number = -1;
static int ett_sabp_cbs_new_serial_number = -1;
static int ett_sabp_cbs_page = -1;
static int ett_sabp_cbs_page_content = -1;
#include "packet-sabp-ett.c"
/* Global variables */
static guint32 ProcedureCode;
static guint32 ProtocolIE_ID;
static guint32 ProtocolExtensionID;
static guint8 sms_encoding;
/* desegmentation of sabp over TCP */
static gboolean gbl_sabp_desegment = TRUE;
/* Dissector tables */
static dissector_table_t sabp_ies_dissector_table;
static dissector_table_t sabp_extension_dissector_table;
static dissector_table_t sabp_proc_imsg_dissector_table;
static dissector_table_t sabp_proc_sout_dissector_table;
static dissector_table_t sabp_proc_uout_dissector_table;
static int dissect_ProtocolIEFieldValue(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 void dissect_sabp_cb_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
#include "packet-sabp-fn.c"
static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint(sabp_ies_dissector_table, ProtocolIE_ID, tvb, pinfo, tree)) ? tvb_length(tvb) : 0;
}
static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint(sabp_extension_dissector_table, ProtocolExtensionID, tvb, pinfo, tree)) ? tvb_length(tvb) : 0;
}
static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint(sabp_proc_imsg_dissector_table, ProcedureCode, tvb, pinfo, tree)) ? tvb_length(tvb) : 0;
}
static int dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint(sabp_proc_sout_dissector_table, ProcedureCode, tvb, pinfo, tree)) ? tvb_length(tvb) : 0;
}
static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return (dissector_try_uint(sabp_proc_uout_dissector_table, ProcedureCode, tvb, pinfo, tree)) ? tvb_length(tvb) : 0;
}
/* 3GPP TS 23.041 version 11.4.0
* 9.4.2.2.5 CB Data
*/
static void
dissect_sabp_cb_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *item, *cbs_page_item;
proto_tree *subtree;
tvbuff_t *page_tvb, *unpacked_tvb;
int offset = 0;
int n;
guint8 nr_pages, len, cb_inf_msg_len;
/* Octet 1 Number-of-Pages */
nr_pages = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_sabp_no_of_pages, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/*
* NOTE: n equal to or less than 15
*/
if(nr_pages > 15){
/* Error */
return;
}
for (n = 0; n < nr_pages; n++) {
item = proto_tree_add_text(tree, tvb, offset, 83, "CB page %u data", n+1);
subtree = proto_item_add_subtree(item, ett_sabp_cbs_page);
/* octet 2 - 83 CBS-Message-Information-Page 1 */
cbs_page_item = proto_tree_add_item(subtree, hf_sabp_cb_msg_inf_page, tvb, offset, 82, ENC_BIG_ENDIAN);
cb_inf_msg_len = tvb_get_guint8(tvb,offset+82);
page_tvb = tvb_new_subset(tvb, offset, cb_inf_msg_len, cb_inf_msg_len);
unpacked_tvb = dissect_cbs_data(sms_encoding, page_tvb, subtree, pinfo, 0);
len = tvb_length(unpacked_tvb);
if (unpacked_tvb != NULL){
if (tree != NULL){
proto_tree *cbs_page_subtree = proto_item_add_subtree(cbs_page_item, ett_sabp_cbs_page_content);
proto_tree_add_string(cbs_page_subtree, hf_sabp_cbs_page_content, unpacked_tvb, 0, len, tvb_get_string(wmem_packet_scope(), unpacked_tvb, 0, len));
}
}
offset = offset+82;
/* 84 CBS-Message-Information-Length 1 */
proto_tree_add_item(subtree, hf_sabp_cb_inf_len, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
}
static guint
get_sabp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
{
guint32 type_length;
int bit_offset;
asn1_ctx_t asn1_ctx;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
/* Length should be in the 3:d octet */
offset = offset + 3;
bit_offset = offset<<3;
/* Get the length of the sabp packet. offset in bits */
dissect_per_length_determinant(tvb, bit_offset, &asn1_ctx, NULL, -1, &type_length);
/*
* Return the length of the PDU
* which is 3 + the length of the length, we only care about length up to 16K
* ("n" less than 128) a single octet containing "n" with bit 8 set to zero;
* ("n" less than 16K) two octets containing "n" with bit 8 of the first octet set to 1 and bit 7 set to zero;
*/
if (type_length < 128)
return type_length+4;
return type_length+5;
}
static int
dissect_sabp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *sabp_item = NULL;
proto_tree *sabp_tree = NULL;
/* make entry in the Protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, PSNAME);
/* create the sbap protocol tree */
sabp_item = proto_tree_add_item(tree, proto_sabp, tvb, 0, -1, ENC_NA);
sabp_tree = proto_item_add_subtree(sabp_item, ett_sabp);
dissect_SABP_PDU_PDU(tvb, pinfo, sabp_tree, NULL);
return tvb_length(tvb);
}
/* Note a little bit of a hack assumes length max takes two bytes and that the length starts at byte 4 */
static int
dissect_sabp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
tcp_dissect_pdus(tvb, pinfo, tree, gbl_sabp_desegment, 5,
get_sabp_pdu_len, dissect_sabp, data);
return tvb_length(tvb);
}
/*--- proto_register_sbap -------------------------------------------*/
void proto_register_sabp(void) {
/* List of fields */
static hf_register_info hf[] = {
{ &hf_sabp_no_of_pages,
{ "Number-of-Pages", "sabp.no_of_pages",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }},
{ &hf_sabp_cb_msg_inf_page,
{ "CBS-Message-Information-Page", "sabp.cb_msg_inf_page",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_sabp_cbs_page_content,
{ "CBS Page Content", "sabp.cb_page_content",
FT_STRING, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_sabp_cb_inf_len,
{ "CBS-Message-Information-Length", "sabp.cb_inf_len",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }},
#include "packet-sabp-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_sabp,
&ett_sabp_e212,
&ett_sabp_cbs_data_coding,
&ett_sabp_bcast_msg,
&ett_sabp_cbs_serial_number,
&ett_sabp_cbs_new_serial_number,
&ett_sabp_cbs_page,
&ett_sabp_cbs_page_content,
#include "packet-sabp-ettarr.c"
};
/* Register protocol */
proto_sabp = proto_register_protocol(PNAME, PSNAME, PFNAME);
/* Register fields and subtrees */
proto_register_field_array(proto_sabp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register dissector */
new_register_dissector("sabp", dissect_sabp, proto_sabp);
new_register_dissector("sabp.tcp", dissect_sabp_tcp, proto_sabp);
/* Register dissector tables */
sabp_ies_dissector_table = register_dissector_table("sabp.ies", "SABP-PROTOCOL-IES", FT_UINT32, BASE_DEC);
sabp_extension_dissector_table = register_dissector_table("sabp.extension", "SABP-PROTOCOL-EXTENSION", FT_UINT32, BASE_DEC);
sabp_proc_imsg_dissector_table = register_dissector_table("sabp.proc.imsg", "SABP-ELEMENTARY-PROCEDURE InitiatingMessage", FT_UINT32, BASE_DEC);
sabp_proc_sout_dissector_table = register_dissector_table("sabp.proc.sout", "SABP-ELEMENTARY-PROCEDURE SuccessfulOutcome", FT_UINT32, BASE_DEC);
sabp_proc_uout_dissector_table = register_dissector_table("sabp.proc.uout", "SABP-ELEMENTARY-PROCEDURE UnsuccessfulOutcome", FT_UINT32, BASE_DEC);
}
/*--- proto_reg_handoff_sbap ---------------------------------------*/
void
proto_reg_handoff_sabp(void)
{
dissector_handle_t sabp_handle;
dissector_handle_t sabp_tcp_handle;
sabp_handle = find_dissector("sabp");
sabp_tcp_handle = find_dissector("sabp.tcp");
dissector_add_uint("udp.port", 3452, sabp_handle);
dissector_add_uint("tcp.port", 3452, sabp_tcp_handle);
dissector_add_uint("sctp.ppi", SABP_PAYLOAD_PROTOCOL_ID, sabp_handle);
#include "packet-sabp-dis-tab.c"
}
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