/* packet-ranap.c * Routines for UMTS Node B Application Part(RANAP) packet dissection * Copyright 2005 - 2010, Anders Broman * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later * * References: 3GPP TS 25.413 version 10.4.0 Release 10 */ #include "config.h" #include #include #include #include #include #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" #include "packet-rtp.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 49 /* id_RerouteNASRequest = 49 */ #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 dissector_handle_t bssgp_handle = 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" /*****************************************************************************/ /* Packet private data */ /* For this dissector, all access to actx->private_data should be made */ /* through this API, which ensures that they will not overwrite each other!! */ /*****************************************************************************/ typedef struct ranap_private_data_t { guint32 transportLayerAddress_ipv4; guint16 binding_id_port; e212_number_type_t number_type; } ranap_private_data_t; /* Helper function to get or create the private data struct */ static ranap_private_data_t* ranap_get_private_data(asn1_ctx_t *actx) { packet_info *pinfo = actx->pinfo; ranap_private_data_t *private_data = (ranap_private_data_t *)p_get_proto_data(pinfo->pool, pinfo, proto_ranap, 0); if(private_data == NULL ) { private_data = wmem_new0(pinfo->pool, ranap_private_data_t); p_add_proto_data(pinfo->pool, pinfo, proto_ranap, 0, private_data); } return private_data; } /* Helper function to reset the private data struct */ static void ranap_reset_private_data(packet_info *pinfo) { p_remove_proto_data(pinfo->pool, pinfo, proto_ranap, 0); } static guint32 private_data_get_transportLayerAddress_ipv4(asn1_ctx_t *actx) { ranap_private_data_t *private_data = (ranap_private_data_t*)ranap_get_private_data(actx); return private_data->transportLayerAddress_ipv4; } static void private_data_set_transportLayerAddress_ipv4(asn1_ctx_t *actx, guint32 transportLayerAddress_ipv4) { ranap_private_data_t *private_data = (ranap_private_data_t*)ranap_get_private_data(actx); private_data->transportLayerAddress_ipv4 = transportLayerAddress_ipv4; } static guint16 private_data_get_binding_id_port(asn1_ctx_t *actx) { ranap_private_data_t *private_data = (ranap_private_data_t*)ranap_get_private_data(actx); return private_data->binding_id_port; } static void private_data_set_binding_id_port(asn1_ctx_t *actx, guint16 binding_id_port) { ranap_private_data_t *private_data = (ranap_private_data_t*)ranap_get_private_data(actx); private_data->binding_id_port = binding_id_port; } /*****************************************************************************/ /* 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); /* Clearing any old 'private data' stored */ ranap_reset_private_data(pinfo); 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; guint length; int offset; /* Is it a ranap packet? * * 4th octet should be the length of the rest of the message. * 3th octed is the Criticality field * 2nd octet is the message-type e Z[0, 28] * 1st octet is the PDU type (with the extension bit) * (obviously there must be at least four octets) * * If all of them hold true we'll assume it's RANAP */ #define LENGTH_OFFSET 3 #define CRIT_OFFSET 2 #define MSG_TYPE_OFFSET 1 #define PDU_TYPE_OFFSET 0 if (tvb_captured_length(tvb) < RANAP_MSG_MIN_LENGTH) { return FALSE; } temp = tvb_get_guint8(tvb, PDU_TYPE_OFFSET); if (temp & 0x1F) { /* PDU Type byte is not 0x00 (initiatingMessage), 0x20 (succesfulOutcome), 0x40 (unsuccesfulOutcome) or 0x60 (outcome), ignore extension bit (0x80) */ return FALSE; } temp = tvb_get_guint8(tvb, CRIT_OFFSET); if (temp == 0xC0 || temp & 0x3F) { /* Criticality byte is not 0x00 (reject), 0x40 (ignore) or 0x80 (notify) */ return FALSE; } /* compute aligned PER length determinant without calling dissect_per_length_determinant() to avoid exceptions and info added to tree, info column and expert info */ offset = LENGTH_OFFSET; length = tvb_get_guint8(tvb, offset); offset += 1; if ((length & 0x80) == 0x80) { if ((length & 0xc0) == 0x80) { length &= 0x3f; length <<= 8; length += tvb_get_guint8(tvb, offset); offset += 1; } else { length = 0; } } 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); bssgp_handle = find_dissector("bssgp"); 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); 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; } /* * 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: */