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 11 years ago committed by Ivan Kluchnikov
parent d5f0133eb2
commit 5c2f9fbfa3
  1. 236
      GPRSSocket.cpp
  2. 33
      GPRSSocket.h
  3. 41
      Makefile.am
  4. 26
      RLCMAC.cpp
  5. 363
      bssgp.cpp
  6. 53
      bssgp.h

@ -0,0 +1,236 @@
/*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);
}
}
}

@ -0,0 +1,33 @@
/*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

@ -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)
#MOSTLYCLEANFILES += testSource testDestination
#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

@ -0,0 +1,26 @@
/* 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();
}

@ -0,0 +1,363 @@
/* 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++;
}
}

@ -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
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