/* packet-sabp-template.c * Routines for UTRAN Iu-BC Interface: Service Area Broadcast Protocol (SABP) packet dissection * Copyright 2007, Tomas Kukosa * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #include #include "packet-tcp.h" #include "packet-per.h" #include "packet-e212.h" #include "packet-gsm_map.h" #include "packet-gsm_sms.h" #include #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_captured_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_captured_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_captured_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_captured_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_captured_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 *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++) { subtree = proto_tree_add_subtree_format(tree, tvb, offset, 83, ett_sabp_cbs_page, NULL, "CB page %u data", n+1); /* 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_NA); cb_inf_msg_len = tvb_get_guint8(tvb,offset+82); page_tvb = tvb_new_subset_length(tvb, offset, cb_inf_msg_len); unpacked_tvb = dissect_cbs_data(sms_encoding, page_tvb, subtree, pinfo, 0); len = tvb_captured_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_item(cbs_page_subtree, hf_sabp_cbs_page_content, unpacked_tvb, 0, len, ENC_UTF_8|ENC_NA); } } 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 sabp 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_captured_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_captured_length(tvb); } /*--- proto_register_sabp -------------------------------------------*/ 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_sabp ---------------------------------------*/ 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" }