| /////////////////////////////////////////////////////////////////////////////// |
| // // |
| // Copyright Test Competence Center (TCC) ETH 2016 // |
| // // |
| // The copyright to the computer program(s) herein is the property of TCC. // |
| // The program(s) may be used and/or copied only with the written permission // |
| // of TCC or in accordance with the terms and conditions stipulated in the // |
| // agreement/contract under which the program(s) has been supplied. // |
| // // |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // File: GTPC_EncDec.cc |
| // Rev: R1B |
| // Prodnr: CNL 113 843 |
| // Contact: http://ttcn.ericsson.se |
| // Reference: 3GPP TS 29.060 v13.5.0 |
| |
| #include "GTPC_Types.hh" |
| |
| namespace GTPC__Types { |
| |
| |
| // find the length of the optional part and decode optional part into OPT_PART |
| int find_optpart_length(const unsigned char * opt_part_ptr,GTPC__Header__optional__part& OPT_PART)// pointer to opt part start |
| { |
| int opt_part_length = 4; // mandatory minimum length of opt_part |
| OPT_PART.sequenceNumber() = OCTETSTRING(2,opt_part_ptr); |
| OPT_PART.npduNumber() = OCTETSTRING(1,opt_part_ptr+2); |
| OPT_PART.nextExtHeader() = OCTETSTRING(1,opt_part_ptr+3); |
| OPT_PART.gTPC__extensionHeader__List() = OMIT_VALUE; |
| |
| int i = 0; |
| bool opt_part_end = false; |
| while(!opt_part_end) |
| { |
| if (opt_part_ptr[opt_part_length-1] != 0x00) // 0x00 means end of optional part |
| { |
| unsigned char lengthfield = opt_part_ptr[opt_part_length]; |
| |
| OPT_PART.gTPC__extensionHeader__List()()[i].lengthfield() = lengthfield; |
| OPT_PART.gTPC__extensionHeader__List()()[i].content() = |
| OCTETSTRING(4*lengthfield-2,opt_part_ptr + opt_part_length +1); |
| OPT_PART.gTPC__extensionHeader__List()()[i].nextExtHeader() = |
| OCTETSTRING(1,opt_part_ptr + opt_part_length + 4*lengthfield - 1); |
| |
| opt_part_length = opt_part_length + 4*lengthfield; |
| i++; |
| } |
| else |
| {opt_part_end = true;} |
| } |
| |
| return opt_part_length; |
| } |
| |
| |
| void dec__PDU__GTPC_no_optional_part(const unsigned char * udp__pdu,const int pl_udp_pdu_length, const SystemUnderTest& pl__SystemUnderTest,PDU__GTPC& pdu) |
| { |
| TTCN_Buffer buf; |
| |
| if ((pl__SystemUnderTest == SystemUnderTest::GGSN) || (pl__SystemUnderTest == SystemUnderTest::CGW)) |
| // testing GGSN or CGW (not default) |
| { |
| const unsigned char *gtpc_message = (const unsigned char *) udp__pdu; |
| if ((gtpc_message[1] == 0x12) || (gtpc_message[1] == 0x13)) |
| // if updatePDPContextRequest or updatePDPContextResponse message is received from GGSN or C-GW |
| { |
| unsigned char pn = gtpc_message[0] & 0x01; |
| pdu.pn__bit() = BITSTRING(1,&pn); |
| |
| unsigned char s = (gtpc_message[0] & 0x02) >> 1; |
| pdu.s__bit() = BITSTRING(1,&s); |
| |
| unsigned char e = (gtpc_message[0] & 0x04) >> 2; |
| pdu.e__bit() = BITSTRING(1,&e); |
| |
| unsigned char spare = (gtpc_message[0] & 0x08) >> 3; |
| pdu.spare() = BITSTRING(1,&spare ); |
| |
| unsigned char pt = (gtpc_message[0] & 0x10) >> 4; |
| pdu.pt() = BITSTRING(1,&pt ); |
| |
| unsigned char version = ((gtpc_message[0] & 0x80) >> 7) | |
| ((gtpc_message[0] & 0x40) >> 5) | |
| ((gtpc_message[0] & 0x20) >> 3) ; |
| pdu.version() = BITSTRING(3,&version); |
| |
| pdu.messageType() = OCTETSTRING(1,gtpc_message+1); |
| |
| pdu.lengthf() = (gtpc_message[2] << 8) + gtpc_message[3]; |
| |
| pdu.teid() = OCTETSTRING(4,gtpc_message+4); |
| |
| pdu.opt__part() = OMIT_VALUE; |
| |
| if (gtpc_message[1] == 0x12) //updatePDPContextRequest |
| { |
| if(pl__SystemUnderTest == SystemUnderTest::GGSN) // from GGSN |
| { |
| UpdatePDPContextRequestGGSN updatePDPContextRequestGGSN; |
| OCTETSTRING updatePDPContextRequestGGSN_string = OCTETSTRING(pl_udp_pdu_length-8,udp__pdu+8 ); |
| buf.put_os(updatePDPContextRequestGGSN_string); |
| updatePDPContextRequestGGSN.decode(UpdatePDPContextRequestGGSN_descr_,buf,TTCN_EncDec::CT_RAW); |
| pdu.gtpc__pdu().updatePDPContextRequest().updatePDPContextRequestGGSN() = updatePDPContextRequestGGSN; |
| } |
| else // from CGW |
| { |
| UpdatePDPContextRequestCGW updatePDPContextRequestCGW; |
| OCTETSTRING updatePDPContextRequestCGW_string = OCTETSTRING(pl_udp_pdu_length-8,udp__pdu+8 ); |
| buf.put_os(updatePDPContextRequestCGW_string); |
| updatePDPContextRequestCGW.decode(UpdatePDPContextRequestCGW_descr_,buf,TTCN_EncDec::CT_RAW); |
| pdu.gtpc__pdu().updatePDPContextRequest().updatePDPContextRequestCGW() = updatePDPContextRequestCGW; |
| } |
| } |
| else //updatePDPContextResponse |
| { |
| if(pl__SystemUnderTest == SystemUnderTest::GGSN) // from GGSN |
| { |
| UpdatePDPContextResponseGGSN updatePDPContextResponseGGSN; |
| OCTETSTRING updatePDPContextResponseGGSN_string = OCTETSTRING(pl_udp_pdu_length-8,udp__pdu+8 ); |
| buf.put_os(updatePDPContextResponseGGSN_string); |
| updatePDPContextResponseGGSN.decode(UpdatePDPContextResponseGGSN_descr_,buf,TTCN_EncDec::CT_RAW); |
| pdu.gtpc__pdu().updatePDPContextResponse().updatePDPContextResponseGGSN() = updatePDPContextResponseGGSN; |
| } |
| else // from CGW |
| { |
| UpdatePDPContextResponseCGW updatePDPContextResponseCGW; |
| OCTETSTRING updatePDPContextResponseCGW_string = OCTETSTRING(pl_udp_pdu_length-8,udp__pdu+8 ); |
| buf.put_os(updatePDPContextResponseCGW_string); |
| updatePDPContextResponseCGW.decode(UpdatePDPContextResponseCGW_descr_,buf,TTCN_EncDec::CT_RAW); |
| pdu.gtpc__pdu().updatePDPContextResponse().updatePDPContextResponseCGW() = updatePDPContextResponseCGW; |
| } |
| } |
| |
| buf.clear(); |
| return; |
| } |
| else // if message not equal to updatePDPContextRequest or updatePDPContextResponse is received from GGSN or C-GW |
| { |
| buf.put_s(pl_udp_pdu_length,udp__pdu); |
| pdu.decode(PDU__GTPC_descr_, buf, TTCN_EncDec::CT_RAW); |
| buf.clear(); |
| return; |
| } |
| } |
| else //pl__SystemUnderTest is SGSN or MME (this is default) |
| { |
| buf.put_s(pl_udp_pdu_length,udp__pdu); |
| pdu.decode(PDU__GTPC_descr_, buf, TTCN_EncDec::CT_RAW); |
| buf.clear(); |
| return; |
| } |
| } |
| |
| ////////////////////////////////// |
| // Decoding function for GTPC__DialoguePDU |
| ////////////////////////////////// |
| |
| PDU__GTPC dec__PDU__GTPC(const OCTETSTRING& udp__pdu,const SystemUnderTest& pl__SystemUnderTest) |
| { |
| PDU__GTPC pdu; |
| |
| const unsigned char *gtpc_message = (const unsigned char *) udp__pdu; |
| |
| int opt_part_length = 0; |
| if ( gtpc_message[0] & 0x07 ) // opt_part is present |
| { |
| GTPC__Header__optional__part OPT_PART; |
| |
| // find the length of the optional part and decode optional part into OPT_PART |
| opt_part_length = find_optpart_length(gtpc_message+8,OPT_PART); |
| if( ((gtpc_message[2] << 8) + gtpc_message[3] - opt_part_length) < 0 ) |
| {TTCN_error("Decoding error, lengthf field is shorter that decoded length of opt_part");} |
| |
| // build PDU without optional part |
| unsigned int gtpc_IEs_length = (gtpc_message[2] << 8) + gtpc_message[3] - opt_part_length; |
| unsigned char gtpcBuf[8 + gtpc_IEs_length]; |
| memcpy(gtpcBuf,gtpc_message,8); |
| memcpy(gtpcBuf+8,gtpc_message+8+opt_part_length,gtpc_IEs_length); |
| |
| // substitute dummy bits (indicating there is no optional part) |
| gtpcBuf[0] = gtpcBuf[0] & 0xf8; |
| |
| // substitute dummy length (not including optional part) |
| gtpcBuf[2] = (gtpc_IEs_length & 0xff00) >> 8; |
| gtpcBuf[3] = gtpc_IEs_length & 0xff; |
| |
| // call decoding function |
| dec__PDU__GTPC_no_optional_part(gtpcBuf,udp__pdu.lengthof() - opt_part_length,pl__SystemUnderTest,pdu); |
| |
| // put back the original values |
| unsigned char pn = gtpc_message[0] & 0x01; |
| pdu.pn__bit() = BITSTRING(1,&pn); |
| |
| unsigned char s = (gtpc_message[0] & 0x02) >> 1; |
| pdu.s__bit() = BITSTRING(1,&s); |
| |
| unsigned char e = (gtpc_message[0] & 0x04) >> 2; |
| pdu.e__bit() = BITSTRING(1,&e); |
| |
| pdu.lengthf() = (gtpc_message[2] << 8) + gtpc_message[3]; |
| |
| pdu.opt__part() = OPT_PART; |
| |
| return pdu; |
| } |
| else // opt_part is not present |
| { |
| dec__PDU__GTPC_no_optional_part(gtpc_message,udp__pdu.lengthof(),pl__SystemUnderTest,pdu); |
| return pdu; |
| } |
| } // end of function |
| |
| |
| |
| }//namespace |