/////////////////////////////////////////////////////////////////////////////// // // Copyright (c) 2000-2019 Ericsson Telecom AB // // All rights reserved. This program and the accompanying materials // are made available under the terms of the Eclipse Public License v2.0 // which accompanies this distribution, and is available at // https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html /////////////////////////////////////////////////////////////////////////////// // // File: LLC_EncDec.cc // Rev: R3A // Prodnr: CNL 113 577 // Updated: 2008-01-22 // Contact: http://ttcn.ericsson.se // Reference: 3GPP TS 44.064 7.1.0 #include "LLC_Types.hh" #include // GIVEN IN CODE RECEIVED FROM ERV #define CRC_POLY_LLC2 0xad85dd // GIVEN IN SPECIFICATION //#define CRC_POLY_LLC2 0xbba1b5 #define TABLE_LENGTH 256 // For UI frames if PM bit is 0 (unprotected) then CRC will be calculated over Header + N202 octets #define N202 4 unsigned int mCRCTable[TABLE_LENGTH] = { 0x00000000, 0x00d6a776, 0x00f64557, 0x0020e221, 0x00b78115, 0x00612663, 0x0041c442, 0x00976334, 0x00340991, 0x00e2aee7, 0x00c24cc6, 0x0014ebb0, 0x00838884, 0x00552ff2, 0x0075cdd3, 0x00a36aa5, 0x00681322, 0x00beb454, 0x009e5675, 0x0048f103, 0x00df9237, 0x00093541, 0x0029d760, 0x00ff7016, 0x005c1ab3, 0x008abdc5, 0x00aa5fe4, 0x007cf892, 0x00eb9ba6, 0x003d3cd0, 0x001ddef1, 0x00cb7987, 0x00d02644, 0x00068132, 0x00266313, 0x00f0c465, 0x0067a751, 0x00b10027, 0x0091e206, 0x00474570, 0x00e42fd5, 0x003288a3, 0x00126a82, 0x00c4cdf4, 0x0053aec0, 0x008509b6, 0x00a5eb97, 0x00734ce1, 0x00b83566, 0x006e9210, 0x004e7031, 0x0098d747, 0x000fb473, 0x00d91305, 0x00f9f124, 0x002f5652, 0x008c3cf7, 0x005a9b81, 0x007a79a0, 0x00acded6, 0x003bbde2, 0x00ed1a94, 0x00cdf8b5, 0x001b5fc3, 0x00fb4733, 0x002de045, 0x000d0264, 0x00dba512, 0x004cc626, 0x009a6150, 0x00ba8371, 0x006c2407, 0x00cf4ea2, 0x0019e9d4, 0x00390bf5, 0x00efac83, 0x0078cfb7, 0x00ae68c1, 0x008e8ae0, 0x00582d96, 0x00935411, 0x0045f367, 0x00651146, 0x00b3b630, 0x0024d504, 0x00f27272, 0x00d29053, 0x00043725, 0x00a75d80, 0x0071faf6, 0x005118d7, 0x0087bfa1, 0x0010dc95, 0x00c67be3, 0x00e699c2, 0x00303eb4, 0x002b6177, 0x00fdc601, 0x00dd2420, 0x000b8356, 0x009ce062, 0x004a4714, 0x006aa535, 0x00bc0243, 0x001f68e6, 0x00c9cf90, 0x00e92db1, 0x003f8ac7, 0x00a8e9f3, 0x007e4e85, 0x005eaca4, 0x00880bd2, 0x00437255, 0x0095d523, 0x00b53702, 0x00639074, 0x00f4f340, 0x00225436, 0x0002b617, 0x00d41161, 0x00777bc4, 0x00a1dcb2, 0x00813e93, 0x005799e5, 0x00c0fad1, 0x00165da7, 0x0036bf86, 0x00e018f0, 0x00ad85dd, 0x007b22ab, 0x005bc08a, 0x008d67fc, 0x001a04c8, 0x00cca3be, 0x00ec419f, 0x003ae6e9, 0x00998c4c, 0x004f2b3a, 0x006fc91b, 0x00b96e6d, 0x002e0d59, 0x00f8aa2f, 0x00d8480e, 0x000eef78, 0x00c596ff, 0x00133189, 0x0033d3a8, 0x00e574de, 0x007217ea, 0x00a4b09c, 0x008452bd, 0x0052f5cb, 0x00f19f6e, 0x00273818, 0x0007da39, 0x00d17d4f, 0x00461e7b, 0x0090b90d, 0x00b05b2c, 0x0066fc5a, 0x007da399, 0x00ab04ef, 0x008be6ce, 0x005d41b8, 0x00ca228c, 0x001c85fa, 0x003c67db, 0x00eac0ad, 0x0049aa08, 0x009f0d7e, 0x00bfef5f, 0x00694829, 0x00fe2b1d, 0x00288c6b, 0x00086e4a, 0x00dec93c, 0x0015b0bb, 0x00c317cd, 0x00e3f5ec, 0x0035529a, 0x00a231ae, 0x007496d8, 0x005474f9, 0x0082d38f, 0x0021b92a, 0x00f71e5c, 0x00d7fc7d, 0x00015b0b, 0x0096383f, 0x00409f49, 0x00607d68, 0x00b6da1e, 0x0056c2ee, 0x00806598, 0x00a087b9, 0x007620cf, 0x00e143fb, 0x0037e48d, 0x001706ac, 0x00c1a1da, 0x0062cb7f, 0x00b46c09, 0x00948e28, 0x0042295e, 0x00d54a6a, 0x0003ed1c, 0x00230f3d, 0x00f5a84b, 0x003ed1cc, 0x00e876ba, 0x00c8949b, 0x001e33ed, 0x008950d9, 0x005ff7af, 0x007f158e, 0x00a9b2f8, 0x000ad85d, 0x00dc7f2b, 0x00fc9d0a, 0x002a3a7c, 0x00bd5948, 0x006bfe3e, 0x004b1c1f, 0x009dbb69, 0x0086e4aa, 0x005043dc, 0x0070a1fd, 0x00a6068b, 0x003165bf, 0x00e7c2c9, 0x00c720e8, 0x0011879e, 0x00b2ed3b, 0x00644a4d, 0x0044a86c, 0x00920f1a, 0x00056c2e, 0x00d3cb58, 0x00f32979, 0x00258e0f, 0x00eef788, 0x003850fe, 0x0018b2df, 0x00ce15a9, 0x0059769d, 0x008fd1eb, 0x00af33ca, 0x007994bc, 0x00dafe19, 0x000c596f, 0x002cbb4e, 0x00fa1c38, 0x006d7f0c, 0x00bbd87a, 0x009b3a5b, 0x004d9d2d }; static void BuildCrc24Table() { unsigned int i,j; unsigned int reg; for( i = 0; i < TABLE_LENGTH; i++ ) { reg = i; for( j = 8; j > 0; j-- ) { if( reg & 1 ) { reg = (reg>>1) ^ (unsigned int) CRC_POLY_LLC2; } else { reg >>= 1; } } reg &= 0x00ffffffL; mCRCTable[i] = (unsigned int)reg; //printf("mCRCTable[%d]= 0x%08x\n",i,mCRCTable[i]); } } //--------------------------------------------------------------------------------------- unsigned int Calculate_CRC(TTCN_Buffer& pdu) { const unsigned char* loc_pdu = pdu.get_data(); //BuildCrc24Table(); //TTCN_Logger::begin_event(TTCN_DEBUG); //TTCN_Logger::log_event("mCRCTable[%d]= %d\n",255,mCRCTable[255]); //TTCN_Logger::log_event("mCRCTable[%d]= 0x%08x (%u)",255,mCRCTable[255]); //TTCN_Logger::log_event("\n"); //TTCN_Logger::end_event(); unsigned int reg = 0xFFFFFF; unsigned int length = pdu.get_len(); if(((loc_pdu[1] >>5) & 0x07) == 0x06) //UI frame { if ((loc_pdu[2] & 0x01) == 0x00) // PM bit is 0 (unprotected) { if(length > 3 + N202) // pdu length is longer than header + N202 { length = 3 + N202; // length = header length + N202 } } } while ( length--) { reg = ((reg>>8) & 0x00ffff)^mCRCTable[(reg^*((unsigned char*)loc_pdu++)) & 0xffL]; } reg ^= 0xffffffL; reg = ((reg >> 16) & 0x000000ff)+ ((reg) & 0x0000ff00) + ((reg <<16 )& 0x00ff0000); return reg & 0x00ffffffL; } //--------------------------------------------------------------------------------------- namespace LLC__Types { OCTETSTRING enc__PDU__LLC(const PDU__LLC& pdu) { TTCN_Buffer bb; PDU__LLC pdu2(pdu); if (pdu2.get_selection() == PDU__LLC::ALT_pDU__LLC__UI) { if ( pdu2.pDU__LLC__UI().fCS().ispresent()) { if ( pdu2.pDU__LLC__UI().fCS() == int2oct(0,3) ) { // IF ZERO, THEN ENCODER NEEDS TO GENERATE CRC pdu2.pDU__LLC__UI().fCS() = OMIT_VALUE; pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } else { // IF ENCODER SENDS OUT NONZERO CRC GIVEN IN TTCN TEMPLATE pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else { //FCS OMIT pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else if (pdu2.get_selection() == PDU__LLC::ALT_pDU__LLC__U) { if (pdu2.pDU__LLC__U().information__field__U().get_selection() == Information__field__U::ALT_uA) { int record_of_size = pdu2.pDU__LLC__U().information__field__U().uA().size_of(); for (int i = 0; i < (record_of_size) ; i++) { // AUTOMATICALLY CALCULATE WHICH LENGTH FORMAT SHOULD BE USED AND CHANGE SHORT LENGTH FORM // TO LONG LENGTH FORM IF NECESSARY WHEN L3 PDU IS INCLUDED if ( pdu2.pDU__LLC__U().information__field__U().uA()[i].typefield() == int2bit(11,5) ) { if( pdu2.pDU__LLC__U().information__field__U().uA()[i].xID__Data().l3param().lengthof() > 3) { pdu2.pDU__LLC__U().information__field__U().uA()[i].xID__length().long__len() = pdu2.pDU__LLC__U().information__field__U().uA()[i].xID__Data().l3param().lengthof(); } } } } if (pdu2.pDU__LLC__U().information__field__U().get_selection() == Information__field__U::ALT_sABM) { int record_of_size = pdu2.pDU__LLC__U().information__field__U().sABM().size_of(); for (int i = 0; i < (record_of_size) ; i++) { // AUTOMATICALLY CALCULATE WHICH LENGTH FORMAT SHOULD BE USED AND CHANGE SHORT LENGTH FORM // TO LONG LENGTH FORM IF NECESSARY WHEN L3 PDU IS INCLUDED if ( pdu2.pDU__LLC__U().information__field__U().sABM()[i].typefield() == int2bit(11,5) ) { if( pdu2.pDU__LLC__U().information__field__U().sABM()[i].xID__Data().l3param().lengthof() > 3) { pdu2.pDU__LLC__U().information__field__U().sABM()[i].xID__length().long__len() = pdu2.pDU__LLC__U().information__field__U().sABM()[i].xID__Data().l3param().lengthof(); } } } } if (pdu2.pDU__LLC__U().information__field__U().get_selection() == Information__field__U::ALT_xID) { int record_of_size = pdu2.pDU__LLC__U().information__field__U().xID().size_of(); for (int i = 0; i < (record_of_size) ; i++) { // AUTOMATICALLY CALCULATE WHICH LENGTH FORMAT SHOULD BE USED AND CHANGE SHORT LENGTH FORM // TO LONG LENGTH FORM IF NECESSARY WHEN L3 PDU IS INCLUDED if ( pdu2.pDU__LLC__U().information__field__U().xID()[i].typefield() == int2bit(11,5) ) { if( pdu2.pDU__LLC__U().information__field__U().xID()[i].xID__Data().l3param().lengthof() > 3) { pdu2.pDU__LLC__U().information__field__U().xID()[i].xID__length().long__len() = pdu2.pDU__LLC__U().information__field__U().xID()[i].xID__Data().l3param().lengthof(); } } } } if ( pdu2.pDU__LLC__U().fCS().ispresent()) { if ( pdu2.pDU__LLC__U().fCS() == int2oct(0,3) ) // IF ENCODER NEEDS TO GENERATE CRC { pdu2.pDU__LLC__U().fCS() = OMIT_VALUE; pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } else { // IF ENCODER SENDS OUT NONZERO CRC GIVEN IN TTCN TEMPLATE pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else { //FCS OMIT pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else { TTCN_error("Can not encode LLC PDU"); //Neither UI NOR U return OCTETSTRING (bb.get_len(), bb.get_data()); // this is dummy to avoid warning during compilation } } OCTETSTRING enc__PDU__LLC(const PDU__LLC_template& pdu) { return enc__PDU__LLC(pdu.valueof()); } PDU__LLC dec__PDU__LLC(const OCTETSTRING& stream, const BOOLEAN& checkFCS) { PDU__LLC retv; TTCN_Buffer bb; size_t datalength = stream.lengthof()-3; bb.put_s(datalength,(const unsigned char *)stream); retv.decode(PDU__LLC_descr_, bb, TTCN_EncDec::CT_RAW); const unsigned char * CRC_AS_RECEIVED = (const unsigned char *)stream+datalength; if(checkFCS) { // FILL CRC octets with zeroes if CRC is OK OCTETSTRING crc = int2oct(0,3); unsigned int CRC_CALCULATED = Calculate_CRC(bb); // COMPARE CRC RECEIVED IN LLC PDU WITH CRC CALCULATED FROM LLC PDU if( (CRC_AS_RECEIVED[ 0 ] != (CRC_CALCULATED & 0xff0000 ) >> 16) || (CRC_AS_RECEIVED[ 1 ] != (CRC_CALCULATED & 0xff00 ) >> 8) || CRC_AS_RECEIVED[ 2 ] != (CRC_CALCULATED & 0xff ) ) { TTCN_warning("CRC ERROR IN LLC PDU"); // CRC IS NOT AS EXPECTED crc=OCTETSTRING(3,CRC_AS_RECEIVED); } if (retv.get_selection() == PDU__LLC::ALT_pDU__LLC__UI) { retv.pDU__LLC__UI().fCS() = crc; } if (retv.get_selection() == PDU__LLC::ALT_pDU__LLC__U) { retv.pDU__LLC__U().fCS() = crc; } } else { if (retv.get_selection() == PDU__LLC::ALT_pDU__LLC__UI) { retv.pDU__LLC__UI().fCS() = OCTETSTRING(3,CRC_AS_RECEIVED); } else if (retv.get_selection() == PDU__LLC::ALT_pDU__LLC__U) { retv.pDU__LLC__U().fCS() = OCTETSTRING(3,CRC_AS_RECEIVED); } } return retv; } }//namespace