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Added RLC/MAC application. 

- 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
Ivan Kluchnikov 2012-02-05 02:27:17 +04:00 committed by Ivan Kluchnikov
parent d5f0133eb2
commit 5c2f9fbfa3
6 changed files with 748 additions and 4 deletions
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236
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/*GPRSSocket.cpp
*
* 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.
*/
#include <Sockets.h>
#include <Threads.h>
#include <BitVector.h>
#include "GPRSSocket.h"
#include "gsm_rlcmac.h"
#include "bssgp.h"
#define MAX_UDP_LENGTH 1500
#define RLCMAC_DATA_BLOCK 0
#define RLCMAC_CONTROL_BLOCK 1
// TODO: We should take ports and IP from config.
UDPSocket GPRSRLCMACSocket(5070, "127.0.0.1", 5934);
void sendToOpenBTS(BitVector * vector)
{
char buffer[MAX_UDP_LENGTH];
int ofs = 0;
vector->pack((unsigned char*)&buffer[ofs]);
ofs += vector->size() >> 3;
COUT("Send to OpenBTS: " << *vector);
GPRSRLCMACSocket.write(buffer, ofs);
}
void writePDassignment(BitVector * dest, uint8_t TFI, uint32_t TLLI)
{
// TODO We should use our implementation of encode RLC/MAC Control messages.
unsigned wp = 0;
dest->writeField(wp,0x1,2); // Payload Type
dest->writeField(wp,0x0,2); // Uplink block with TDMA framenumber
dest->writeField(wp,0x1,1); // Suppl/Polling Bit
dest->writeField(wp,0x1,3); // Uplink state flag
dest->writeField(wp,0x2,6); // MESSAGE TYPE
dest->writeField(wp,0x0,2); // Page Mode
dest->writeField(wp,0x0,1); // switch PERSIST_LEVEL: off
dest->writeField(wp,0x2,2); // switch TLLI : on
dest->writeField(wp,TLLI,32); // TLLI
dest->writeField(wp,0x0,1); // Message escape
dest->writeField(wp,0x0,2); // Medium Access Method: Dynamic Allocation
dest->writeField(wp,0x0,1); // RLC acknowledged mode
dest->writeField(wp,0x0,1); // the network establishes no new downlink TBF for the mobile station
dest->writeField(wp,0x1,8); // timeslot 7
dest->writeField(wp,0x1,8); // TIMING_ADVANCE_INDEX
dest->writeField(wp,0x0,1); // switch TIMING_ADVANCE_VALUE = off
dest->writeField(wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on
dest->writeField(wp,0xC,4); // TIMING_ADVANCE_INDEX
dest->writeField(wp,0x7,3); // TIMING_ADVANCE_TIMESLOT_NUMBER
dest->writeField(wp,0x0,1); // switch POWER CONTROL = off
dest->writeField(wp,0x1,1); // Frequency Parameters information elements = present
dest->writeField(wp,0x2,3); // Training Sequence Code (TSC) = 2
dest->writeField(wp,0x1,2); // Indirect encoding struct = present
dest->writeField(wp,0x0,6); // MAIO
dest->writeField(wp,0xE,4); // MA_Number
dest->writeField(wp,0x8,4); // CHANGE_MARK_1 CHANGE_MARK_2
dest->writeField(wp,0x1,1); // switch TFI : on
dest->writeField(wp,0x14,5);// TFI
dest->writeField(wp,0x1,1); // Power Control Parameters IE = present
dest->writeField(wp,0x0,4); // ALPHA power control parameter
dest->writeField(wp,0x0,1); // switch GAMMA_TN0 = off
dest->writeField(wp,0x0,1); // switch GAMMA_TN1 = off
dest->writeField(wp,0x0,1); // switch GAMMA_TN2 = off
dest->writeField(wp,0x0,1); // switch GAMMA_TN3 = off
dest->writeField(wp,0x0,1); // switch GAMMA_TN4 = off
dest->writeField(wp,0x0,1); // switch GAMMA_TN5 = off
dest->writeField(wp,0x0,1); // switch GAMMA_TN6 = off
dest->writeField(wp,0x1,1); // switch GAMMA_TN7 = on
dest->writeField(wp,0x0,5); // GAMMA_TN7
dest->writeField(wp,0x0,1); // TBF Starting TIME IE not present
dest->writeField(wp,0x0,1); // Measurement Mapping struct not present
}
void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN)
{
// TODO We should use our implementation of encode RLC/MAC Control messages.
unsigned wp = 0;
dest->writeField(wp,0x1,2); // payload
dest->writeField(wp,0x0,2); // Uplink block with TDMA framenumber
if (CV == 0) dest->writeField(wp,0x1,1); // Suppl/Polling Bit
else dest->writeField(wp,0x0,1); //Suppl/Polling Bit
dest->writeField(wp,0x1,3); // Uplink state flag
//dest->writeField(wp,0x0,1); // Reduced block sequence number
//dest->writeField(wp,BSN+6,5); // Radio transaction identifier
//dest->writeField(wp,0x1,1); // Final segment
//dest->writeField(wp,0x1,1); // Address control
//dest->writeField(wp,0x0,2); // Power reduction: 0
//dest->writeField(wp,TFI,5); // Temporary flow identifier
//dest->writeField(wp,0x1,1); // Direction
dest->writeField(wp,0x09,6); // MESSAGE TYPE
dest->writeField(wp,0x0,2); // Page Mode
dest->writeField(wp,0x0,2);
dest->writeField(wp,TFI,5); // Uplink TFI
dest->writeField(wp,0x0,1);
dest->writeField(wp,0x0,2); // CS1
if (CV == 0) dest->writeField(wp,0x1,1); // FINAL_ACK_INDICATION
else dest->writeField(wp,0x0,1); // FINAL_ACK_INDICATION
dest->writeField(wp,BSN+1,7); // STARTING_SEQUENCE_NUMBER
// RECEIVE_BLOCK_BITMAP
for (unsigned i=0; i<8; i++) {
dest->writeField(wp,0xff,8);
}
dest->writeField(wp,0x1,1); // CONTENTION_RESOLUTION_TLLI = present
dest->writeField(wp,TLLI,8*4);
dest->writeField(wp,0x00,4); //spare
}
void RLCMACDispatchMessage(BitVector *vector)
{
static uint8_t rlc_data[60];
static uint8_t tfi = 0;
static uint32_t tlli = 0;
static unsigned dataIndex = 0;
static unsigned startDispatch = 0;
unsigned blockDataLen = 0;
unsigned readIndex = 0;
unsigned payload = vector->readField(readIndex, 2);
switch (payload) {
case RLCMAC_DATA_BLOCK:
{
COUT("RLCMAC_DATA_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");
RlcMacUplinkDataBlock_t * dataBlock = (RlcMacUplinkDataBlock_t *)malloc(sizeof(RlcMacUplinkDataBlock_t));
decode_gsm_rlcmac_uplink_data(vector, dataBlock);
COUT("RLCMAC_DATA_BLOCK_END------------------------------");
//TODO Implement other cases.
if (dataBlock->BSN == 0)
{
startDispatch = 1;
}
if (startDispatch)
{
tfi = dataBlock->TFI;
if (dataBlock->E_1 == 0) // Extension octet follows immediately
{
blockDataLen = dataBlock->LENGTH_INDICATOR[0];
}
else
{
blockDataLen = 20;
if(dataBlock->TI == 1) // TLLI field is present
{
tlli = dataBlock->TLLI;
blockDataLen -= 4;
if (dataBlock->PI == 1) // PFI is present if TI field indicates presence of TLLI
{
blockDataLen -= 1;
}
}
}
unsigned dataOctetNum = 0;
for (unsigned i = dataIndex; i < dataIndex + blockDataLen; i++)
{
rlc_data[i] = dataBlock->RLC_DATA[dataOctetNum];
dataOctetNum++;
}
dataIndex += blockDataLen;
BitVector packetUplinkAck(23*8);
packetUplinkAck.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
writePUack(&packetUplinkAck, tfi, tlli, dataBlock->CV, dataBlock->BSN);
COUT("RLCMAC_CONTROL_BLOCK>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
RlcMacDownlink_t * pUA = (RlcMacDownlink_t *)malloc(sizeof(RlcMacUplink_t));
decode_gsm_rlcmac_downlink(&packetUplinkAck, pUA);
free(pUA);
COUT("RLCMAC_CONTROL_BLOCK_END------------------------------");
sendToOpenBTS(&packetUplinkAck);
}
if (dataBlock->CV == 0)
{
sendToSGSN(tfi, tlli, rlc_data, dataIndex);
dataIndex = 0;
startDispatch = 0;
}
free(dataBlock);
}
break;
case RLCMAC_CONTROL_BLOCK:
{
COUT("RLCMAC_CONTROL_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");
RlcMacUplink_t * controlBlock = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
decode_gsm_rlcmac_uplink(vector, controlBlock);
free(controlBlock);
COUT("RLCMAC_CONTROL_BLOCK_END------------------------------");
}
break;
default:
COUT("Unknown RLCMAC block payload\n");
}
}
void *RLCMACSocket(void *)
{
BitVector *vector = new BitVector(23*8);
GPRSRLCMACSocket.nonblocking();
while (1) {
char buf[MAX_UDP_LENGTH];
int count = GPRSRLCMACSocket.read(buf, 3000);
if (count>0) {
vector->unpack((const unsigned char*)buf);
COUT("Recieve from OpenBTS (MS): " << *vector);
RLCMACDispatchMessage(vector);
}
}
}

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/*GPRSSocket.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 GPRSSOCKET_H
#define GPRSSOCKET_H
#include <BitVector.h>
void sendToOpenBTS(BitVector * vector);
void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN);
void RLCMACDispatchMessage(BitVector *vector);
void *RLCMACSocket(void *);
#endif // GPRSSOCKET_H

41
Makefile.am
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@ -27,19 +27,52 @@ noinst_LTLIBRARIES = libgprs.la
libgprs_la_SOURCES = \
csn1.cpp \
gsm_rlcmac.cpp
gsm_rlcmac.cpp \
bssgp.cpp \
GPRSSocket.cpp
noinst_PROGRAMS = \
RLCMACTest
RLCMACTest \
RLCMAC
noinst_HEADERS = \
csn1.h \
gsm_rlcmac.h
gsm_rlcmac.h \
bssgp.h \
GPRSSocket.h
RLCMACTest_SOURCES = RLCMACTest.cpp
RLCMACTest_LDADD = \
libgprs.la \
$(COMMON_LA)
#OPENBSC_DIR = /path to OpenBSC dir
#OPENGGSN_DIR = /path to OpenGGGSN dir
RLCMAC_SOURCES = RLCMAC.cpp
RLCMAC_LDADD = \
libgprs.la \
$(OPENBSC_DIR)/src/libgb/gprs_ns.o \
$(OPENBSC_DIR)/src/libgb/gprs_bssgp.o \
$(OPENBSC_DIR)/src/libgb/gprs_bssgp_bss.o \
$(OPENBSC_DIR)/src/libgb/gprs_bssgp_util.o \
$(OPENBSC_DIR)/src/libgb/gprs_ns_frgre.o \
$(OPENGGSN_DIR)/gtp/queue.o \
$(OPENGGSN_DIR)/gtp/lookupa.o \
$(OPENGGSN_DIR)/gtp/pdp.o \
$(OPENGGSN_DIR)/gtp/gtpie.o \
$(OPENGGSN_DIR)/gtp/gtp.o \
$(OPENBSC_DIR)/src/gprs/sgsn_libgtp.o \
$(OPENBSC_DIR)/src/gprs/gprs_sndcp.o \
$(OPENBSC_DIR)/src/gprs/crc24.o \
$(OPENBSC_DIR)/src/gprs/gprs_llc.o \
$(OPENBSC_DIR)/src/gprs/gprs_gmm.o \
$(OPENBSC_DIR)/src/gprs/gprs_sgsn.o \
$(OPENBSC_DIR)/src/libcommon/socket.o \
$(OPENBSC_DIR)/src/libcommon/debug.o \
-losmocore \
-losmogsm \
$(COMMON_LA)
#MOSTLYCLEANFILES += testSource testDestination

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/* RLCMAC.cpp
*
* 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.
*/
#include "bssgp.h"
int main(int argc, char *argv[])
{
// Start RLC/MAC server for communication with OpenBTS and OsmoSGSN.
RLCMACServer();
}

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bssgp.cpp Normal file
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/* bssgp.cpp
*
* 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.
*/
#include <arpa/inet.h>
#include <Threads.h>
#include "GPRSSocket.h"
#include "bssgp.h"
// TODO: We should move this parameters to config file.
#define SGSN_IP "127.0.0.1"
#define SGSN_PORT 23000
#define CELL_ID 3
#define BVCI 7
#define NSEI 3
#define NSVCI 4
#define MNC 1
#define MCC 1
#define LAC 1000
#define RAC 1
#define QOS_PROFILE 0
#define BSSGP_HDR_LEN 20
#define NS_HDR_LEN 4
#define MAX_LEN_PDU 100
#define IE_PDU 14
#define BLOCK_DATA_LEN 16
#define BLOCK_LEN 23
uint16_t bvci = BVCI;
uint16_t nsei = NSEI;
uint8_t TFI;
struct bssgp_bvc_ctx *bctx = btsctx_alloc(bvci, nsei);
struct gprs_nsvc *nsvc;
struct gprs_ns_inst *sgsn_nsi;
struct sgsn_instance *sgsn;
void *tall_bsc_ctx;
// Send RLC data to OpenBTS.
void sendRLC(uint32_t tlli, uint8_t *pdu, unsigned startIndex, unsigned endIndex)
{
unsigned wp = 0;
BitVector resultVector(BLOCK_LEN*8);
resultVector.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
// TODO: Encode downlink RLC/MAC data block.
sendToOpenBTS(&resultVector);
}
/* Receive a BSSGP PDU from a BSS on a PTP BVCI */
int gprs_bssgp_bss_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx)
{
struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
uint8_t pdu_type = bgph->pdu_type;
uint8_t pdu[MAX_LEN_PDU];
unsigned rc = 0;
unsigned dataIndex = 0;
unsigned numBlocks = 0;
unsigned i = 0;
unsigned j = 0;
unsigned pduIndex = 0;
struct bssgp_ud_hdr *budh;
/* If traffic is received on a BVC that is marked as blocked, the
* received PDU shall not be accepted and a STATUS PDU (Cause value:
* BVC Blocked) shall be sent to the peer entity on the signalling BVC */
if (bctx->state & BVC_S_BLOCKED && pdu_type != BSSGP_PDUT_STATUS)
{
uint16_t bvci = msgb_bvci(msg);
LOGP(DBSSGP, LOGL_NOTICE, "rx BVC_S_BLOCKED\n");
return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &bvci, msg);
}
switch (pdu_type) {
case BSSGP_PDUT_DL_UNITDATA:
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_DL_UNITDATA\n");
budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg);
LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP TLLI=0x%08x \n", ntohl(budh->tlli));
for (i = 4; i < MAX_LEN_PDU; i++)
{
LOGP(DBSSGP, LOGL_NOTICE, "SERCH data = -0x%02x\n", budh ->data[i]);
if(budh ->data[i] == IE_PDU)
{
pduIndex = i+2;
break;
}
}
for (i = pduIndex; i < pduIndex + (budh->data[pduIndex-1]&0x7f); i++)
{
LOGP(DBSSGP, LOGL_NOTICE, "-0x%02x\n", budh ->data[i]);
pdu[dataIndex] = budh ->data[i];
dataIndex++;
}
DEBUGP(DBSSGP, "BSSGP Catch from SGSN=%u octets. Send it to OpenBTS.\n", dataIndex);
if (dataIndex > BLOCK_DATA_LEN)
{
int blockDataLen = BLOCK_DATA_LEN;
numBlocks = dataIndex/BLOCK_DATA_LEN;
int ost = dataIndex%BLOCK_DATA_LEN;
int startIndex = 0;
int endIndex = 0;
if (dataIndex%BLOCK_DATA_LEN > 0)
{
numBlocks++;
}
for (i = 0; i < numBlocks; i++)
{
if (i == numBlocks-1)
{
blockDataLen = ost;
}
endIndex = startIndex+blockDataLen;
sendRLC(ntohl(budh->tlli), pdu, startIndex, endIndex);
startIndex += blockDataLen;
}
}
else
{
sendRLC(ntohl(budh->tlli), pdu, 0, dataIndex);
}
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_RA_CAPA_UPDATE_ACK:
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++;
}
}

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/* 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