- Segmentation of upper layer PDUs into RLC data blocks and re-assembly of RLC data blocks into upper layer PDUs. - Segmentation of RLC/MAC control messages into RLC/MAC control blocks and re-assembly of RLC/MAC control messages from RLC/MAC control blocks. - NS and BSSGP protocol implementation for communication with OpenSGSN. - UDPSocket for communication with OpenBTS.zecke/hacks/quick-exit
parent
d5f0133eb2
commit
5c2f9fbfa3
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/*GPRSSocket.cpp
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* |
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* Copyright (C) 2011 Ivan Klyuchnikov |
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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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#include <Sockets.h> |
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#include <Threads.h> |
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#include <BitVector.h> |
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#include "GPRSSocket.h" |
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#include "gsm_rlcmac.h" |
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#include "bssgp.h" |
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#define MAX_UDP_LENGTH 1500 |
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#define RLCMAC_DATA_BLOCK 0 |
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#define RLCMAC_CONTROL_BLOCK 1 |
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// TODO: We should take ports and IP from config.
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UDPSocket GPRSRLCMACSocket(5070, "127.0.0.1", 5934); |
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void sendToOpenBTS(BitVector * vector) |
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{ |
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char buffer[MAX_UDP_LENGTH]; |
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int ofs = 0; |
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vector->pack((unsigned char*)&buffer[ofs]); |
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ofs += vector->size() >> 3; |
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COUT("Send to OpenBTS: " << *vector); |
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GPRSRLCMACSocket.write(buffer, ofs); |
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} |
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void writePDassignment(BitVector * dest, uint8_t TFI, uint32_t TLLI) |
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{ |
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// TODO We should use our implementation of encode RLC/MAC Control messages.
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unsigned wp = 0; |
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dest->writeField(wp,0x1,2); // Payload Type
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dest->writeField(wp,0x0,2); // Uplink block with TDMA framenumber
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dest->writeField(wp,0x1,1); // Suppl/Polling Bit
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dest->writeField(wp,0x1,3); // Uplink state flag
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dest->writeField(wp,0x2,6); // MESSAGE TYPE
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dest->writeField(wp,0x0,2); // Page Mode
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dest->writeField(wp,0x0,1); // switch PERSIST_LEVEL: off
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dest->writeField(wp,0x2,2); // switch TLLI : on
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dest->writeField(wp,TLLI,32); // TLLI
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dest->writeField(wp,0x0,1); // Message escape
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dest->writeField(wp,0x0,2); // Medium Access Method: Dynamic Allocation
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dest->writeField(wp,0x0,1); // RLC acknowledged mode
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dest->writeField(wp,0x0,1); // the network establishes no new downlink TBF for the mobile station
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dest->writeField(wp,0x1,8); // timeslot 7
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dest->writeField(wp,0x1,8); // TIMING_ADVANCE_INDEX
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dest->writeField(wp,0x0,1); // switch TIMING_ADVANCE_VALUE = off
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dest->writeField(wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on
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dest->writeField(wp,0xC,4); // TIMING_ADVANCE_INDEX
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dest->writeField(wp,0x7,3); // TIMING_ADVANCE_TIMESLOT_NUMBER
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dest->writeField(wp,0x0,1); // switch POWER CONTROL = off
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dest->writeField(wp,0x1,1); // Frequency Parameters information elements = present
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dest->writeField(wp,0x2,3); // Training Sequence Code (TSC) = 2
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dest->writeField(wp,0x1,2); // Indirect encoding struct = present
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dest->writeField(wp,0x0,6); // MAIO
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dest->writeField(wp,0xE,4); // MA_Number
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dest->writeField(wp,0x8,4); // CHANGE_MARK_1 CHANGE_MARK_2
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dest->writeField(wp,0x1,1); // switch TFI : on
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dest->writeField(wp,0x14,5);// TFI
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dest->writeField(wp,0x1,1); // Power Control Parameters IE = present
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dest->writeField(wp,0x0,4); // ALPHA power control parameter
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dest->writeField(wp,0x0,1); // switch GAMMA_TN0 = off
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dest->writeField(wp,0x0,1); // switch GAMMA_TN1 = off
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dest->writeField(wp,0x0,1); // switch GAMMA_TN2 = off
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dest->writeField(wp,0x0,1); // switch GAMMA_TN3 = off
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dest->writeField(wp,0x0,1); // switch GAMMA_TN4 = off
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dest->writeField(wp,0x0,1); // switch GAMMA_TN5 = off
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dest->writeField(wp,0x0,1); // switch GAMMA_TN6 = off
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dest->writeField(wp,0x1,1); // switch GAMMA_TN7 = on
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dest->writeField(wp,0x0,5); // GAMMA_TN7
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dest->writeField(wp,0x0,1); // TBF Starting TIME IE not present
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dest->writeField(wp,0x0,1); // Measurement Mapping struct not present
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} |
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void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN) |
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{ |
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// TODO We should use our implementation of encode RLC/MAC Control messages.
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unsigned wp = 0; |
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dest->writeField(wp,0x1,2); // payload
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dest->writeField(wp,0x0,2); // Uplink block with TDMA framenumber
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if (CV == 0) dest->writeField(wp,0x1,1); // Suppl/Polling Bit
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else dest->writeField(wp,0x0,1); //Suppl/Polling Bit
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dest->writeField(wp,0x1,3); // Uplink state flag
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//dest->writeField(wp,0x0,1); // Reduced block sequence number
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//dest->writeField(wp,BSN+6,5); // Radio transaction identifier
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//dest->writeField(wp,0x1,1); // Final segment
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//dest->writeField(wp,0x1,1); // Address control
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//dest->writeField(wp,0x0,2); // Power reduction: 0
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//dest->writeField(wp,TFI,5); // Temporary flow identifier
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//dest->writeField(wp,0x1,1); // Direction
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dest->writeField(wp,0x09,6); // MESSAGE TYPE
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dest->writeField(wp,0x0,2); // Page Mode
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dest->writeField(wp,0x0,2); |
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dest->writeField(wp,TFI,5); // Uplink TFI
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dest->writeField(wp,0x0,1); |
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dest->writeField(wp,0x0,2); // CS1
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if (CV == 0) dest->writeField(wp,0x1,1); // FINAL_ACK_INDICATION
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else dest->writeField(wp,0x0,1); // FINAL_ACK_INDICATION
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dest->writeField(wp,BSN+1,7); // STARTING_SEQUENCE_NUMBER
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// RECEIVE_BLOCK_BITMAP
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for (unsigned i=0; i<8; i++) { |
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dest->writeField(wp,0xff,8); |
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} |
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dest->writeField(wp,0x1,1); // CONTENTION_RESOLUTION_TLLI = present
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dest->writeField(wp,TLLI,8*4); |
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dest->writeField(wp,0x00,4); //spare
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} |
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void RLCMACDispatchMessage(BitVector *vector) |
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{ |
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static uint8_t rlc_data[60]; |
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static uint8_t tfi = 0; |
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static uint32_t tlli = 0; |
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static unsigned dataIndex = 0; |
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static unsigned startDispatch = 0; |
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unsigned blockDataLen = 0; |
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unsigned readIndex = 0; |
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unsigned payload = vector->readField(readIndex, 2); |
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switch (payload) { |
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case RLCMAC_DATA_BLOCK:
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{ |
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COUT("RLCMAC_DATA_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"); |
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RlcMacUplinkDataBlock_t * dataBlock = (RlcMacUplinkDataBlock_t *)malloc(sizeof(RlcMacUplinkDataBlock_t)); |
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decode_gsm_rlcmac_uplink_data(vector, dataBlock); |
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COUT("RLCMAC_DATA_BLOCK_END------------------------------"); |
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//TODO Implement other cases.
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if (dataBlock->BSN == 0) |
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{ |
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startDispatch = 1; |
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} |
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if (startDispatch) |
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{ |
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tfi = dataBlock->TFI; |
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if (dataBlock->E_1 == 0) // Extension octet follows immediately
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{ |
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blockDataLen = dataBlock->LENGTH_INDICATOR[0]; |
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} |
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else |
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{ |
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blockDataLen = 20; |
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if(dataBlock->TI == 1) // TLLI field is present
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{ |
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tlli = dataBlock->TLLI; |
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blockDataLen -= 4; |
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if (dataBlock->PI == 1) // PFI is present if TI field indicates presence of TLLI
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{ |
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blockDataLen -= 1; |
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} |
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} |
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} |
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unsigned dataOctetNum = 0; |
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for (unsigned i = dataIndex; i < dataIndex + blockDataLen; i++) |
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{ |
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rlc_data[i] = dataBlock->RLC_DATA[dataOctetNum]; |
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dataOctetNum++; |
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} |
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dataIndex += blockDataLen; |
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BitVector packetUplinkAck(23*8); |
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packetUplinkAck.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
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writePUack(&packetUplinkAck, tfi, tlli, dataBlock->CV, dataBlock->BSN); |
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COUT("RLCMAC_CONTROL_BLOCK>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"); |
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RlcMacDownlink_t * pUA = (RlcMacDownlink_t *)malloc(sizeof(RlcMacUplink_t)); |
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decode_gsm_rlcmac_downlink(&packetUplinkAck, pUA); |
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free(pUA); |
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COUT("RLCMAC_CONTROL_BLOCK_END------------------------------"); |
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sendToOpenBTS(&packetUplinkAck); |
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} |
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if (dataBlock->CV == 0) |
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{ |
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sendToSGSN(tfi, tlli, rlc_data, dataIndex); |
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dataIndex = 0; |
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startDispatch = 0; |
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} |
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free(dataBlock); |
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} |
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break; |
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case RLCMAC_CONTROL_BLOCK: |
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{ |
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COUT("RLCMAC_CONTROL_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"); |
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RlcMacUplink_t * controlBlock = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t)); |
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decode_gsm_rlcmac_uplink(vector, controlBlock); |
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free(controlBlock); |
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COUT("RLCMAC_CONTROL_BLOCK_END------------------------------"); |
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} |
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break; |
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default: |
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COUT("Unknown RLCMAC block payload\n"); |
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} |
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} |
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void *RLCMACSocket(void *) |
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{ |
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BitVector *vector = new BitVector(23*8); |
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GPRSRLCMACSocket.nonblocking(); |
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while (1) { |
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char buf[MAX_UDP_LENGTH]; |
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int count = GPRSRLCMACSocket.read(buf, 3000); |
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if (count>0) { |
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vector->unpack((const unsigned char*)buf); |
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COUT("Recieve from OpenBTS (MS): " << *vector); |
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RLCMACDispatchMessage(vector); |
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} |
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} |
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} |
@ -0,0 +1,33 @@ |
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/*GPRSSocket.h
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* |
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* Copyright (C) 2011 Ivan Klyuchnikov |
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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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#ifndef GPRSSOCKET_H |
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#define GPRSSOCKET_H |
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#include <BitVector.h> |
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void sendToOpenBTS(BitVector * vector); |
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void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN); |
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void RLCMACDispatchMessage(BitVector *vector); |
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void *RLCMACSocket(void *); |
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#endif // GPRSSOCKET_H
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/* RLCMAC.cpp
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* |
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* Copyright (C) 2011 Ivan Klyuchnikov |
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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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#include "bssgp.h" |
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int main(int argc, char *argv[]) |
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{ |
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// Start RLC/MAC server for communication with OpenBTS and OsmoSGSN.
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RLCMACServer(); |
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} |
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/* bssgp.cpp
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* |
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* Copyright (C) 2011 Ivan Klyuchnikov |
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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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#include <arpa/inet.h> |
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#include <Threads.h> |
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#include "GPRSSocket.h" |
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#include "bssgp.h" |
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// TODO: We should move this parameters to config file.
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#define SGSN_IP "127.0.0.1" |
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#define SGSN_PORT 23000 |
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#define CELL_ID 3 |
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#define BVCI 7 |
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#define NSEI 3 |
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#define NSVCI 4 |
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#define MNC 1 |
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#define MCC 1 |
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#define LAC 1000 |
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#define RAC 1 |
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#define QOS_PROFILE 0 |
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#define BSSGP_HDR_LEN 20 |
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#define NS_HDR_LEN 4 |
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#define MAX_LEN_PDU 100 |
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#define IE_PDU 14 |
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#define BLOCK_DATA_LEN 16 |
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#define BLOCK_LEN 23 |
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uint16_t bvci = BVCI; |
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uint16_t nsei = NSEI; |
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uint8_t TFI; |
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struct bssgp_bvc_ctx *bctx = btsctx_alloc(bvci, nsei); |
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struct gprs_nsvc *nsvc; |
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struct gprs_ns_inst *sgsn_nsi; |
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struct sgsn_instance *sgsn; |
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void *tall_bsc_ctx; |
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// Send RLC data to OpenBTS.
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void sendRLC(uint32_t tlli, uint8_t *pdu, unsigned startIndex, unsigned endIndex) |
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{ |
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unsigned wp = 0; |
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BitVector resultVector(BLOCK_LEN*8); |
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resultVector.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
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// TODO: Encode downlink RLC/MAC data block.
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sendToOpenBTS(&resultVector); |
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} |
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/* Receive a BSSGP PDU from a BSS on a PTP BVCI */ |
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int gprs_bssgp_bss_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx) |
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{ |
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
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uint8_t pdu_type = bgph->pdu_type; |
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uint8_t pdu[MAX_LEN_PDU]; |
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unsigned rc = 0; |
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unsigned dataIndex = 0; |
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unsigned numBlocks = 0; |
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unsigned i = 0; |
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unsigned j = 0; |
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unsigned pduIndex = 0; |
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struct bssgp_ud_hdr *budh; |
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/* If traffic is received on a BVC that is marked as blocked, the
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* received PDU shall not be accepted and a STATUS PDU (Cause value: |
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* BVC Blocked) shall be sent to the peer entity on the signalling BVC */ |
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if (bctx->state & BVC_S_BLOCKED && pdu_type != BSSGP_PDUT_STATUS) |
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{ |
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uint16_t bvci = msgb_bvci(msg); |
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LOGP(DBSSGP, LOGL_NOTICE, "rx BVC_S_BLOCKED\n"); |
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return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &bvci, msg); |
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} |
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switch (pdu_type) { |
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case BSSGP_PDUT_DL_UNITDATA: |
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_DL_UNITDATA\n"); |
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budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg); |
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP TLLI=0x%08x \n", ntohl(budh->tlli)); |
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for (i = 4; i < MAX_LEN_PDU; i++) |
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{ |
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LOGP(DBSSGP, LOGL_NOTICE, "SERCH data = -0x%02x\n", budh ->data[i]); |
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if(budh ->data[i] == IE_PDU) |
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{ |
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pduIndex = i+2; |
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break; |
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} |
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} |
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for (i = pduIndex; i < pduIndex + (budh->data[pduIndex-1]&0x7f); i++) |
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{ |
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LOGP(DBSSGP, LOGL_NOTICE, "-0x%02x\n", budh ->data[i]); |
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pdu[dataIndex] = budh ->data[i]; |
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dataIndex++; |
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} |
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DEBUGP(DBSSGP, "BSSGP Catch from SGSN=%u octets. Send it to OpenBTS.\n", dataIndex); |
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if (dataIndex > BLOCK_DATA_LEN) |
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{ |
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int blockDataLen = BLOCK_DATA_LEN; |
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numBlocks = dataIndex/BLOCK_DATA_LEN; |
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int ost = dataIndex%BLOCK_DATA_LEN; |
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int startIndex = 0; |
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int endIndex = 0; |
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if (dataIndex%BLOCK_DATA_LEN > 0) |
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{ |
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numBlocks++; |
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} |
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for (i = 0; i < numBlocks; i++) |
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{ |
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if (i == numBlocks-1) |
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{ |
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blockDataLen = ost; |
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} |
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endIndex = startIndex+blockDataLen; |
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sendRLC(ntohl(budh->tlli), pdu, startIndex, endIndex); |
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startIndex += blockDataLen; |
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} |
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} |
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else |
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{ |
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sendRLC(ntohl(budh->tlli), pdu, 0, dataIndex); |
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} |
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break; |
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case BSSGP_PDUT_PAGING_PS: |
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n"); |
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break; |
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case BSSGP_PDUT_PAGING_CS: |
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n"); |
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break; |
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case BSSGP_PDUT_RA_CAPA_UPDATE_ACK: |
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RA_CAPA_UPDATE_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_BVC_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_FLOW_CONTROL_MS_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_MS_ACK\n"); |
||||
break; |
||||
default: |
||||
DEBUGP(DBSSGP, "BSSGP BVCI=%u PDU type 0x%02x unknown\n", bctx->bvci, pdu_type); |
||||
rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
||||
break; |
||||
} |
||||
return rc; |
||||
} |
||||
|
||||
/* Receive a BSSGP PDU from a SGSN on a SIGNALLING BVCI */ |
||||
int gprs_bssgp_bss_rx_sign(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx) |
||||
{ |
||||
struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
||||
int rc = 0; |
||||
switch (bgph->pdu_type) { |
||||
case BSSGP_PDUT_STATUS: |
||||
/* Some exception has occurred */ |
||||
DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx BVC STATUS\n", bctx->bvci); |
||||
/* FIXME: send NM_STATUS.ind to NM */ |
||||
break; |
||||
case BSSGP_PDUT_SUSPEND_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_SUSPEND_NACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_NACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_BVC_RESET_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_RESET_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_PAGING_PS: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n"); |
||||
break; |
||||
case BSSGP_PDUT_PAGING_CS: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n"); |
||||
break; |
||||
case BSSGP_PDUT_RESUME_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_RESUME_NACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_NACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_FLUSH_LL: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLUSH_LL\n"); |
||||
break; |
||||
case BSSGP_PDUT_BVC_BLOCK_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_UNBLOCK_ACK\n"); |
||||
break; |
||||
case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SGSN_INVOKE_TRACE\n"); |
||||
break; |
||||
default: |
||||
DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx PDU type 0x%02x unknown\n", bctx->bvci, bgph->pdu_type); |
||||
rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
||||
break; |
||||
} |
||||
return rc; |
||||
} |
||||
|
||||
int gprs_bssgp_bss_rcvmsg(struct msgb *msg) |
||||
{ |
||||
struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
||||
struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg); |
||||
struct tlv_parsed tp; |
||||
uint8_t pdu_type = bgph->pdu_type; |
||||
uint16_t ns_bvci = msgb_bvci(msg); |
||||
int data_len; |
||||
int rc = 0; |
||||
|
||||
/* Identifiers from DOWN: NSEI, BVCI (both in msg->cb) */ |
||||
|
||||
/* UNITDATA BSSGP headers have TLLI in front */ |
||||
if (pdu_type != BSSGP_PDUT_UL_UNITDATA && pdu_type != BSSGP_PDUT_DL_UNITDATA) |
||||
{ |
||||
data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
||||
rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
||||
} |
||||
else |
||||
{ |
||||
data_len = msgb_bssgp_len(msg) - sizeof(*budh); |
||||
rc = bssgp_tlv_parse(&tp, budh->data, data_len); |
||||
} |
||||
|
||||
/* look-up or create the BTS context for this BVC */ |
||||
bctx = btsctx_by_bvci_nsei(ns_bvci, msgb_nsei(msg)); |
||||
|
||||
/* Only a RESET PDU can create a new BVC context */ |
||||
if (!bctx) |
||||
{ |
||||
bctx = btsctx_alloc(ns_bvci, msgb_nsei(msg)); |
||||
} |
||||
|
||||
if (!bctx && pdu_type != BSSGP_PDUT_BVC_RESET_ACK) |
||||
{ |
||||
LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u Rejecting PDU " |
||||
"type %u for unknown BVCI\n", msgb_nsei(msg), ns_bvci, |
||||
pdu_type); |
||||
return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
||||
} |
||||
|
||||
if (bctx) |
||||
{ |
||||
log_set_context(BSC_CTX_BVC, bctx); |
||||
rate_ctr_inc(&bctx->ctrg->ctr[BSSGP_CTR_PKTS_IN]); |
||||
rate_ctr_add(&bctx->ctrg->ctr[BSSGP_CTR_BYTES_IN], msgb_bssgp_len(msg)); |
||||
} |
||||
|
||||
if (ns_bvci == BVCI_SIGNALLING) |
||||
{ |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_SIGNALLING gprs_bssgp_rx_sign\n"); |
||||
rc = gprs_bssgp_bss_rx_sign(msg, &tp, bctx); |
||||
} |
||||
else if (ns_bvci == BVCI_PTM) |
||||
{ |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTM bssgp_tx_status\n"); |
||||
rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
||||
} |
||||
else |
||||
{ |
||||
LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTP gprs_bssgp_rx_ptp\n"); |
||||
rc = gprs_bssgp_bss_rx_ptp(msg, &tp, bctx); |
||||
} |
||||
return rc; |
||||
} |
||||
|
||||
|
||||
int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci) |
||||
{ |
||||
int rc = 0; |
||||
switch (event) { |
||||
case GPRS_NS_EVT_UNIT_DATA: |
||||
/* hand the message into the BSSGP implementation */ |
||||
rc = gprs_bssgp_bss_rcvmsg(msg); |
||||
break; |
||||
default: |
||||
LOGP(DGPRS, LOGL_ERROR, "RLCMAC: Unknown event %u from NS\n", event); |
||||
if (msg) |
||||
talloc_free(msg); |
||||
rc = -EIO; |
||||
break; |
||||
} |
||||
return rc; |
||||
} |
||||
|
||||
// Send RLC data to SGSN.
|
||||
void sendToSGSN(uint8_t tfi, uint32_t tlli, uint8_t * rlc_data, unsigned dataLen) |
||||
{ |
||||
const uint8_t qos_profile = QOS_PROFILE; |
||||
struct msgb *llc_pdu; |
||||
unsigned msgLen = NS_HDR_LEN + BSSGP_HDR_LEN + dataLen; |
||||
TFI = tfi; |
||||
bctx->cell_id = CELL_ID; |
||||
bctx->nsei = NSEI; |
||||
bctx->ra_id.mnc = MNC; |
||||
bctx->ra_id.mcc = MCC; |
||||
bctx->ra_id.lac = LAC; |
||||
bctx->ra_id.rac = RAC; |
||||
bctx->bvci = BVCI; |
||||
LOGP(DBSSGP, LOGL_DEBUG, "Data len %u TLLI 0x%08x , TFI 0x%02x", dataLen, tlli, tfi); |
||||
//for (unsigned i = 0; i < dataLen; i++)
|
||||
// LOGP(DBSSGP, LOGL_DEBUG, " Data[%u] = %u", i, rlc_data[i]);
|
||||
llc_pdu = msgb_alloc_headroom(msgLen, msgLen,"llc_pdu"); |
||||
msgb_tvlv_push(llc_pdu, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*dataLen, rlc_data); |
||||
bssgp_tx_ul_ud(bctx, tlli, &qos_profile, llc_pdu); |
||||
} |
||||
|
||||
void RLCMACServer() |
||||
{ |
||||
uint16_t nsvci = NSVCI; |
||||
|
||||
// Socket for reading BitVectors (RLC/MAC Frames) from OpenBTS application.
|
||||
Thread RLCMACInterface; |
||||
RLCMACInterface.start(RLCMACSocket,NULL); |
||||
|
||||
osmo_init_logging(&log_info); |
||||
sgsn_nsi = gprs_ns_instantiate(&sgsn_ns_cb); |
||||
bssgp_nsi = sgsn_nsi; |
||||
|
||||
if (!bssgp_nsi) |
||||
{ |
||||
LOGP(DGPRS, LOGL_ERROR, "Unable to instantiate NS\n"); |
||||
exit(1); |
||||
} |
||||
|
||||
bctx->cell_id = CELL_ID; |
||||
bctx->nsei = NSEI; |
||||
bctx->ra_id.mnc = MNC; |
||||
bctx->ra_id.mcc = MCC; |
||||
bctx->ra_id.lac = LAC; |
||||
bctx->ra_id.rac = RAC; |
||||
bctx->bvci = BVCI; |
||||
uint8_t cause = 39; |
||||
gprs_ns_nsip_listen(sgsn_nsi); |
||||
|
||||
struct sockaddr_in dest; |
||||
dest.sin_family = AF_INET; |
||||
dest.sin_port = htons(SGSN_PORT); |
||||
inet_aton(SGSN_IP, &dest.sin_addr); |
||||
|
||||
nsvc = nsip_connect(sgsn_nsi, &dest, nsei, nsvci); |
||||
unsigned i = 0; |
||||
while (1)
|
||||
{ |
||||
osmo_select_main(0); |
||||
if (i == 7) |
||||
{ |
||||
bssgp_tx_bvc_reset(bctx, nsvc, bvci, cause); |
||||
} |
||||
i++; |
||||
} |
||||
} |
@ -0,0 +1,53 @@ |
||||
/* bssgp.h
|
||||
* |
||||
* Copyright (C) 2011 Ivan Klyuchnikov |
||||
* |
||||
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
||||
*/ |
||||
|
||||
#ifndef BSSGP_H |
||||
#define BSSGP_H |
||||
|
||||
extern "C" { |
||||
#include <osmocom/core/talloc.h> |
||||
#include <osmocom/core/rate_ctr.h> |
||||
#include <openbsc/debug.h> |
||||
#include <openbsc/signal.h> |
||||
#include <openbsc/gprs_ns.h> |
||||
#include <openbsc/gprs_bssgp.h> |
||||
#include <osmocom/core/application.h> |
||||
|
||||
int bssgp_tx_bvc_reset(struct bssgp_bvc_ctx *bctx, struct gprs_nsvc * nsvc, uint16_t bvci, uint8_t cause); |
||||
|
||||
int bssgp_tx_ul_ud(struct bssgp_bvc_ctx *bctx, uint32_t tlli, const uint8_t *qos_profile, struct msgb *llc_pdu); |
||||
|
||||
struct bssgp_bvc_ctx *btsctx_alloc(uint16_t bvci, uint16_t nsei); |
||||
} |
||||
|
||||
void sendRLC(uint32_t tlli, uint8_t *pdu, unsigned startIndex, unsigned endIndex); |
||||
|
||||
int gprs_bssgp_bss_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx); |
||||
|
||||
int gprs_bssgp_bss_rx_sign(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx); |
||||
|
||||
int gprs_bssgp_bss_rcvmsg(struct msgb *msg); |
||||
|
||||
int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci); |
||||
|
||||
void sendToSGSN(uint8_t tfi, uint32_t tlli, uint8_t * rlc_data, unsigned dataLen); |
||||
|
||||
void RLCMACServer(); |
||||
|
||||
#endif // BSSGP_H
|
Loading…
Reference in new issue