mirror of
https://github.com/fairwaves/openbts-2.8.git
synced 2025-11-04 05:53:17 +00:00
ad37cb3b19
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6168 19bc5d8c-e614-43d4-8b26-e1612bc8e597
561 lines
12 KiB
C++
561 lines
12 KiB
C++
/*
|
|
* Copyright 2008 Free Software Foundation, Inc.
|
|
*
|
|
* This software is distributed under multiple licenses; see the COPYING file in the main directory for licensing information for this specific distribuion.
|
|
*
|
|
* This use of this software may be subject to additional restrictions.
|
|
* See the LEGAL file in the main directory for details.
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <iostream>
|
|
|
|
#include "GSMTransfer.h"
|
|
#include "GSML3Message.h"
|
|
#include "Globals.h"
|
|
|
|
|
|
using namespace std;
|
|
using namespace GSM;
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L2Frame& frame)
|
|
{
|
|
os << "primitive=" << frame.primitive();
|
|
os << " raw=(";
|
|
frame.hex(os);
|
|
os << ")";
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L3Frame& frame)
|
|
{
|
|
os << "primitive=" << frame.primitive();
|
|
os << " raw=(";
|
|
frame.hex(os);
|
|
os << ")";
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L2Header::FrameFormat val)
|
|
{
|
|
switch (val) {
|
|
case L2Header::FmtA: os << "A"; break;
|
|
case L2Header::FmtB: os << "B"; break;
|
|
case L2Header::FmtBbis: os << "Bbis"; break;
|
|
case L2Header::FmtBter: os << "Bter"; break;
|
|
case L2Header::FmtB4: os << "B4"; break;
|
|
case L2Header::FmtC: os << "C"; break;
|
|
default: os << "?" << (int)val << "?";
|
|
}
|
|
return os;
|
|
}
|
|
|
|
|
|
|
|
size_t N201(ChannelType wChanType, L2Header::FrameFormat wFormat)
|
|
{
|
|
// Number of payload bytes in the L2Frame.
|
|
// GSM 04.06 5.8.3
|
|
switch (wFormat) {
|
|
case L2Header::FmtA:
|
|
case L2Header::FmtB:
|
|
switch (wChanType) {
|
|
case SACCHType: return 18;
|
|
case FACCHType:
|
|
case SDCCHType: return 20;
|
|
default: abort();
|
|
}
|
|
case L2Header::FmtBbis:
|
|
// We count L2 pseudolength as part of the header.
|
|
switch (wChanType) {
|
|
case BCCHType:
|
|
case CCCHType: return 22;
|
|
default: abort();
|
|
}
|
|
case L2Header::FmtBter:
|
|
switch (wChanType) {
|
|
case SACCHType: return 21;
|
|
case FACCHType:
|
|
case SDCCHType: return 23;
|
|
default: abort();
|
|
}
|
|
case L2Header::FmtB4:
|
|
switch (wChanType) {
|
|
case SACCHType: return 19;
|
|
default: abort();
|
|
}
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
size_t L2Header::bitsNeeded() const
|
|
{
|
|
// number of BITS to encode the header
|
|
// GSM 04.06 2.1
|
|
switch (mFormat) {
|
|
case FmtA:
|
|
case FmtB: return 3*8;
|
|
case FmtBbis: return 8;
|
|
case FmtBter: return 0;
|
|
case FmtB4: return 2*8;
|
|
case FmtC: return 0;
|
|
default: abort();
|
|
}
|
|
}
|
|
|
|
|
|
|
|
size_t L2Header::write(L2Frame& frame) const
|
|
{
|
|
size_t wp=0;
|
|
switch (mFormat) {
|
|
case FmtA:
|
|
case FmtB:
|
|
mAddress.write(frame,wp);
|
|
mControl.write(frame,wp);
|
|
mLength.write(frame,wp);
|
|
break;
|
|
case FmtBbis:
|
|
mLength.write(frame,wp);
|
|
break;
|
|
case FmtBter:
|
|
break;
|
|
case FmtB4:
|
|
mAddress.write(frame,wp);
|
|
mControl.write(frame,wp);
|
|
break;
|
|
case FmtC:
|
|
break;
|
|
default:
|
|
assert(0);
|
|
}
|
|
return wp;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void L2Control::write(L2Frame& frame, size_t& wp) const
|
|
{
|
|
// GSM 04.06 Table 3
|
|
|
|
switch (mFormat) {
|
|
case IFormat: {
|
|
frame.writeField(wp,mNR,3);
|
|
frame.writeField(wp,mPF,1);
|
|
frame.writeField(wp,mNS,3);
|
|
frame.writeField(wp,0,1);
|
|
break;
|
|
}
|
|
case SFormat:{
|
|
frame.writeField(wp,mNR,3);
|
|
frame.writeField(wp,mPF,1);
|
|
frame.writeField(wp,mSBits,2);
|
|
frame.writeField(wp,1,2);
|
|
break;
|
|
}
|
|
case UFormat:{
|
|
const unsigned U1 = mUBits >> 2;
|
|
const unsigned U2 = mUBits & 0x03;
|
|
frame.writeField(wp,U1,3);
|
|
frame.writeField(wp,mPF,1);
|
|
frame.writeField(wp,U2,2);
|
|
frame.writeField(wp,3,2);
|
|
break;
|
|
}
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
|
|
void L2Length::write(L2Frame& frame, size_t& wp) const
|
|
{
|
|
// GSM 04.06 3.6
|
|
assert(mL<64);
|
|
frame.writeField(wp,mL,6);
|
|
frame.writeField(wp,mM,1);
|
|
frame.writeField(wp,1,1);
|
|
}
|
|
|
|
|
|
|
|
|
|
void L2Frame::idleFill()
|
|
{
|
|
// GSM 04.06 2.2
|
|
static const int pattern[8] = {0,0,1,0,1,0,1,1};
|
|
for (size_t i=0; i<size(); i++) {
|
|
mStart[i] = pattern[i%8];
|
|
}
|
|
}
|
|
|
|
void L2Frame::randomizeFiller(unsigned start)
|
|
{
|
|
/* for debugging
|
|
// no filler or first filler is 0x2b
|
|
if (start-8 < size() && peekField(start-8,8) != 0x2b) {
|
|
LOG(ALERT) << *this << " " << start;
|
|
assert(0);
|
|
}
|
|
// reset of filler is 0x2b
|
|
for (unsigned i = start; i < size(); i+=8) {
|
|
if (peekField(i,8) != 0x2b) {
|
|
LOG(ALERT) << *this << " " << start << " " << i;
|
|
assert(0);
|
|
}
|
|
}
|
|
*/
|
|
for (unsigned i = start; i < size(); i++) {
|
|
settfb(i, random() & 1);
|
|
}
|
|
}
|
|
|
|
void L2Frame::randomizeFiller(const L2Header& header)
|
|
{
|
|
switch (header.format()) {
|
|
case L2Header::FmtA:
|
|
case L2Header::FmtB:
|
|
randomizeFiller((header.length().L() + 4) * 8);
|
|
return;
|
|
case L2Header::FmtBbis:
|
|
case L2Header::FmtB4:
|
|
randomizeFiller((header.length().L() + 2) * 8);
|
|
return;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
L2Frame::L2Frame(const BitVector& bits, Primitive prim)
|
|
:BitVector(23*8),mPrimitive(prim)
|
|
{
|
|
idleFill();
|
|
assert(bits.size()<=this->size());
|
|
bits.copyTo(*this);
|
|
}
|
|
|
|
|
|
#include <stdio.h>
|
|
L2Frame::L2Frame(const L2Header& header, const BitVector& l3, bool noran)
|
|
:BitVector(23*8),mPrimitive(DATA)
|
|
{
|
|
idleFill();
|
|
//printf("header.bitsNeeded=%d l3.size=%d this.size=%d\n",
|
|
//header.bitsNeeded(),l3.size(),this->size());
|
|
assert((header.bitsNeeded()+l3.size())<=this->size());
|
|
size_t wp = header.write(*this);
|
|
l3.copyToSegment(*this,wp);
|
|
// FIXME - figure out why randomizeFiller doesn't like the "noran" headers
|
|
if (gConfig.getBool("GSM.Cipher.ScrambleFiller") && !noran) randomizeFiller(header);
|
|
}
|
|
|
|
|
|
L2Frame::L2Frame(const L2Header& header)
|
|
:BitVector(23*8),mPrimitive(DATA)
|
|
{
|
|
idleFill();
|
|
header.write(*this);
|
|
if (gConfig.getBool("GSM.Cipher.ScrambleFiller")) randomizeFiller(header);
|
|
}
|
|
|
|
|
|
|
|
unsigned L2Frame::SAPI() const
|
|
{
|
|
// Get the service access point indicator,
|
|
// assuming frame format A or B.
|
|
// See GSM 04.06 2.1, 2.3, 3.2.
|
|
// This assumes MSB-first field packing.
|
|
return peekField(3,3);
|
|
}
|
|
|
|
|
|
unsigned L2Frame::LPD() const
|
|
{
|
|
// This assumes MSB-first field packing.
|
|
// See GSM 04.06 3.2, GSM 04.12 3.3.1.
|
|
return peekField(1,2);
|
|
}
|
|
|
|
|
|
L2Control::ControlFormat L2Frame::controlFormat() const
|
|
{
|
|
// Determine the LAPDm frame type.
|
|
// See GSM 04.06 Table 3.
|
|
// The control field is in the second octet.
|
|
if (bit(8+7)==0) return L2Control::IFormat;
|
|
if (bit(8+6)==0) return L2Control::SFormat;
|
|
return L2Control::UFormat;
|
|
}
|
|
|
|
L2Control::FrameType L2Frame::UFrameType() const
|
|
{
|
|
// Determine U-frame command type.
|
|
// GSM 04.06 Table 4.
|
|
// TODO -- This would be more efficient as an array.
|
|
char upper = peekField(8+0,3);
|
|
char lower = peekField(8+4,2);
|
|
char uBits = upper<<2 | lower;
|
|
switch (uBits) {
|
|
case 0x07: return L2Control::SABMFrame;
|
|
case 0x03: return L2Control::DMFrame;
|
|
case 0x00: return L2Control::UIFrame;
|
|
case 0x08: return L2Control::DISCFrame;
|
|
case 0x0c: return L2Control::UAFrame;
|
|
default: return L2Control::BogusFrame;
|
|
}
|
|
}
|
|
|
|
|
|
L2Control::FrameType L2Frame::SFrameType() const
|
|
{
|
|
// Determine S-frame command type.
|
|
// GSM 04.06 Table 4.
|
|
char sBits = peekField(8+4,2);
|
|
static const L2Control::FrameType type[] = {
|
|
L2Control::RRFrame, L2Control::RNRFrame,
|
|
L2Control::REJFrame, L2Control::BogusFrame };
|
|
return type[(int)sBits];
|
|
}
|
|
|
|
|
|
|
|
const L2Frame& GSM::L2IdleFrame()
|
|
{
|
|
static volatile bool init = false;
|
|
static L2Frame idleFrame;
|
|
if (!init) {
|
|
init = true;
|
|
// GSM 04.06 5.4.2.3.
|
|
// As sent by the network.
|
|
idleFrame.fillField(8*0,3,8); // address
|
|
idleFrame.fillField(8*1,3,8); // control
|
|
idleFrame.fillField(8*2,1,8); // length
|
|
if (gConfig.getBool("GSM.Cipher.ScrambleFiller")) idleFrame.randomizeFiller(8*4);
|
|
}
|
|
return idleFrame;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const TxBurst& ts)
|
|
{
|
|
os << "time=" << ts.time() << " data=(" << (const BitVector&)ts << ")" ;
|
|
return os;
|
|
}
|
|
|
|
ostream& GSM::operator<<(ostream& os, const RxBurst& ts)
|
|
{
|
|
os << "time=" << ts.time();
|
|
os << " RSSI=" << ts.RSSI() << " timing=" << ts.timingError();
|
|
os << " data=(" << (const SoftVector&)ts << ")" ;
|
|
return os;
|
|
}
|
|
|
|
|
|
|
|
|
|
// We put this in the .cpp file to avoid a circular dependency.
|
|
TxBurst::TxBurst(const RxBurst& rx)
|
|
:BitVector((const BitVector&)rx),mTime(rx.time())
|
|
{}
|
|
|
|
// We put this in the .cpp file to avoid a circular dependency.
|
|
RxBurst::RxBurst(const TxBurst& source, float wTimingError, int wRSSI)
|
|
:SoftVector((const BitVector&) source),mTime(source.time()),
|
|
mTimingError(wTimingError),mRSSI(wRSSI)
|
|
{ }
|
|
|
|
|
|
|
|
// Methods for the L2 address field.
|
|
|
|
void L2Address::write(L2Frame& frame, size_t& wp) const
|
|
{
|
|
// GSM 04.06 3.2, 3.3
|
|
frame.writeField(wp,0,1); // spare bit
|
|
frame.writeField(wp,mLPD,2);
|
|
frame.writeField(wp,mSAPI,3);
|
|
frame.writeField(wp,mCR,1);
|
|
frame.writeField(wp,1,1); // no extension
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L2Address& address)
|
|
{
|
|
os << "SAPI=" << address.SAPI() << " CR=" << address.CR();
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os,L2Control::ControlFormat format)
|
|
{
|
|
switch (format) {
|
|
case L2Control::IFormat: os << "I"; break;
|
|
case L2Control::SFormat: os << "S"; break;
|
|
case L2Control::UFormat: os << "U"; break;
|
|
default: os << "?" << (int)format << "?"; break;
|
|
}
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L2Control& control)
|
|
{
|
|
os << "fmt=" << control.format() << " ";
|
|
switch (control.format()) {
|
|
case L2Control::IFormat:
|
|
os << "NR=" << control.NR() << " PF=" << control.PF() << " NS=" << control.NS();
|
|
break;
|
|
case L2Control::SFormat:
|
|
os << "NR=" << control.NR() << " PF=" << control.PF();
|
|
os << hex << " Sbits=0x" << control.SBits() << dec;
|
|
break;
|
|
case L2Control::UFormat:
|
|
os << "PF=" << control.PF();
|
|
os << hex << " Ubits=0x" << control.UBits() << dec;
|
|
break;
|
|
default:
|
|
os << "??";
|
|
}
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L2Length& length)
|
|
{
|
|
os << "L=" << length.L() << " M=" << length.M();
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, const L2Header& header)
|
|
{
|
|
os << "fmt=" << header.format();
|
|
os << " addr=(" << header.address() << ")";
|
|
os << " cntrl=(" << header.control() << ")";
|
|
os << " len=(" << header.length() << ")";
|
|
return os;
|
|
}
|
|
|
|
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, L2Control::FrameType cmd)
|
|
{
|
|
switch (cmd) {
|
|
case L2Control::UIFrame: os << "UI"; break;
|
|
case L2Control::SABMFrame: os << "SABM"; break;
|
|
case L2Control::UAFrame: os << "UA"; break;
|
|
case L2Control::DMFrame: os << "DM"; break;
|
|
case L2Control::DISCFrame: os << "DISC"; break;
|
|
case L2Control::RRFrame: os << "RR"; break;
|
|
case L2Control::RNRFrame: os << "RNR"; break;
|
|
case L2Control::REJFrame: os << "REJ"; break;
|
|
case L2Control::IFrame: os << "I"; break;
|
|
default: os << "?" << (int)cmd << "?";
|
|
}
|
|
return os;
|
|
}
|
|
|
|
|
|
ostream& GSM::operator<<(ostream& os, Primitive prim)
|
|
{
|
|
switch (prim) {
|
|
case ESTABLISH: os << "ESTABLISH"; break;
|
|
case RELEASE: os << "RELEASE"; break;
|
|
case DATA: os << "DATA"; break;
|
|
case UNIT_DATA: os << "UNIT_DATA"; break;
|
|
case ERROR: os << "ERROR"; break;
|
|
case HARDRELEASE: os << "HARDRELEASE"; break;
|
|
case HANDOVER_ACCESS: os << "HANDOVER_ACCESS"; break;
|
|
default: os << "?" << (int)prim << "?";
|
|
}
|
|
return os;
|
|
}
|
|
|
|
|
|
|
|
|
|
L3Frame::L3Frame(const L3Message& msg, Primitive wPrimitive)
|
|
:BitVector(msg.bitsNeeded()),mPrimitive(wPrimitive),
|
|
mL2Length(msg.L2Length())
|
|
{
|
|
msg.write(*this);
|
|
}
|
|
|
|
|
|
|
|
L3Frame::L3Frame(const char* hexString)
|
|
:mPrimitive(DATA)
|
|
{
|
|
size_t len = strlen(hexString);
|
|
mL2Length = len/2;
|
|
resize(len*4);
|
|
size_t wp=0;
|
|
for (size_t i=0; i<len; i++) {
|
|
char c = hexString[i];
|
|
int v = c - '0';
|
|
if (v>9) v = c - 'a' + 10;
|
|
writeField(wp,v,4);
|
|
}
|
|
}
|
|
|
|
|
|
L3Frame::L3Frame(const char* binary, size_t len)
|
|
:mPrimitive(DATA)
|
|
{
|
|
mL2Length = len;
|
|
resize(len*8);
|
|
size_t wp=0;
|
|
for (size_t i=0; i<len; i++) {
|
|
writeField(wp,binary[i],8);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static const unsigned fillPattern[8] = {0,0,1,0,1,0,1,1};
|
|
|
|
void L3Frame::writeH(size_t &wp)
|
|
{
|
|
unsigned fillBit = fillPattern[wp%8];
|
|
writeField(wp,!fillBit,1);
|
|
}
|
|
|
|
|
|
void L3Frame::writeL(size_t &wp)
|
|
{
|
|
unsigned fillBit = fillPattern[wp%8];
|
|
writeField(wp,fillBit,1);
|
|
}
|
|
|
|
|
|
|
|
// vim: ts=4 sw=4
|