forked from osmocom/wireshark
227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
/* packet-sbap.c
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* Routines for UTRAN Iu-BC Interface: Service Area Broadcast Protocol (SBAP) packet dissection
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* Copyright 2007, Tomas Kukosa <tomas.kukosa@siemens.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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* Ref: 3GPP TS 25.419 version V9.0.0 (2009-12)
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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/asn1.h>
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#include "packet-tcp.h"
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#include "packet-per.h"
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#include "packet-e212.h"
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#include "packet-gsm_map.h"
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#include "packet-gsm_sms.h"
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#include <epan/sctpppids.h>
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#define PNAME "UTRAN IuBC interface SABP signaling"
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#define PSNAME "SABP"
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#define PFNAME "sabp"
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#include "packet-sabp-val.h"
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/* Initialize the protocol and registered fields */
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static int proto_sabp = -1;
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static int hf_sabp_no_of_pages = -1;
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#include "packet-sabp-hf.c"
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/* Initialize the subtree pointers */
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static int ett_sabp = -1;
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static int ett_sabp_e212 = -1;
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static int ett_sabp_cbs_data_coding = -1;
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static int ett_sabp_bcast_msg = -1;
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#include "packet-sabp-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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static guint8 sms_encoding;
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/* desegmentation of sabp over TCP */
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static gboolean gbl_sabp_desegment = TRUE;
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/* Dissector tables */
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static dissector_table_t sabp_ies_dissector_table;
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static dissector_table_t sabp_extension_dissector_table;
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static dissector_table_t sabp_proc_imsg_dissector_table;
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static dissector_table_t sabp_proc_sout_dissector_table;
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static dissector_table_t sabp_proc_uout_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_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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#include "packet-sabp-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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return (dissector_try_uint(sabp_ies_dissector_table, ProtocolIE_ID, tvb, pinfo, tree)) ? 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(sabp_extension_dissector_table, ProtocolExtensionID, tvb, pinfo, tree)) ? 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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return (dissector_try_uint(sabp_proc_imsg_dissector_table, ProcedureCode, tvb, pinfo, tree)) ? tvb_length(tvb) : 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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return (dissector_try_uint(sabp_proc_sout_dissector_table, ProcedureCode, tvb, pinfo, tree)) ? tvb_length(tvb) : 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(sabp_proc_uout_dissector_table, ProcedureCode, tvb, pinfo, tree)) ? tvb_length(tvb) : 0;
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}
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static guint
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get_sabp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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guint32 type_length;
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int bit_offset;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
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/* Length should be in the 3:d octet */
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offset = offset + 3;
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bit_offset = offset<<3;
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/* Get the length of the sabp packet. offset in bits */
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offset = dissect_per_length_determinant(tvb, bit_offset, &asn1_ctx, NULL, -1, &type_length);
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/*
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* Return the length of the PDU
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* which is 3 + the length of the length, we only care about length up to 16K
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* ("n" less than 128) a single octet containing "n" with bit 8 set to zero;
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* ("n" less than 16K) two octets containing "n" with bit 8 of the first octet set to 1 and bit 7 set to zero;
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*/
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if (type_length < 128)
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return type_length+4;
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return type_length+5;
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}
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static void
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dissect_sabp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *sabp_item = NULL;
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proto_tree *sabp_tree = NULL;
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/* make entry in the Protocol column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PSNAME);
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/* create the sbap protocol tree */
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sabp_item = proto_tree_add_item(tree, proto_sabp, tvb, 0, -1, FALSE);
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sabp_tree = proto_item_add_subtree(sabp_item, ett_sabp);
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dissect_SABP_PDU_PDU(tvb, pinfo, sabp_tree);
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}
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/* Note a little bit of a hack assumes length max takes two bytes and that the length starts at byte 4 */
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static void
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dissect_sabp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, gbl_sabp_desegment, 5,
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get_sabp_pdu_len, dissect_sabp);
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}
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/*--- proto_register_sbap -------------------------------------------*/
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void proto_register_sabp(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_sabp_no_of_pages,
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{ "Number-of-Pages", "sabp.no_of_pages",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }},
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#include "packet-sabp-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_sabp,
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&ett_sabp_e212,
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&ett_sabp_cbs_data_coding,
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&ett_sabp_bcast_msg,
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#include "packet-sabp-ettarr.c"
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};
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/* Register protocol */
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proto_sabp = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_sabp, 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("sabp", dissect_sabp, proto_sabp);
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register_dissector("sabp.tcp", dissect_sabp_tcp, proto_sabp);
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/* Register dissector tables */
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sabp_ies_dissector_table = register_dissector_table("sabp.ies", "SABP-PROTOCOL-IES", FT_UINT32, BASE_DEC);
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sabp_extension_dissector_table = register_dissector_table("sabp.extension", "SABP-PROTOCOL-EXTENSION", FT_UINT32, BASE_DEC);
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sabp_proc_imsg_dissector_table = register_dissector_table("sabp.proc.imsg", "SABP-ELEMENTARY-PROCEDURE InitiatingMessage", FT_UINT32, BASE_DEC);
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sabp_proc_sout_dissector_table = register_dissector_table("sabp.proc.sout", "SABP-ELEMENTARY-PROCEDURE SuccessfulOutcome", FT_UINT32, BASE_DEC);
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sabp_proc_uout_dissector_table = register_dissector_table("sabp.proc.uout", "SABP-ELEMENTARY-PROCEDURE UnsuccessfulOutcome", FT_UINT32, BASE_DEC);
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}
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/*--- proto_reg_handoff_sbap ---------------------------------------*/
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void
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proto_reg_handoff_sabp(void)
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{
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dissector_handle_t sabp_handle;
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dissector_handle_t sabp_tcp_handle;
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sabp_handle = find_dissector("sabp");
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sabp_tcp_handle = find_dissector("sabp.tcp");
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dissector_add_uint("udp.port", 3452, sabp_handle);
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dissector_add_uint("tcp.port", 3452, sabp_tcp_handle);
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dissector_add_uint("sctp.ppi", SABP_PAYLOAD_PROTOCOL_ID, sabp_handle);
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#include "packet-sabp-dis-tab.c"
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}
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