void L2LAPDm::receiveUFrameDISC(const L2Frame& frame)
{
// Caller should hold mLock.
OBJLOG(INFO) << "state=" << mState << " " << frame;
mEstablishmentInProgress = false;
switch (mState) {
case AwaitingEstablish:
clearState();
break;
case LinkReleased:
// GSM 04.06 5.4.5
sendUFrameDM(frame.PF());
clearState();
break;
case ContentionResolution:
case LinkEstablished:
// Shut down the link and ack with UA.
// GSM 04.06 5.4.4.2.
sendUFrameUA(frame.PF());
clearState();
break;
case AwaitingRelease:
// We can arrive here if both ends sent DISC at the same time.
// GSM 04.06 5.4.6.1.
sendUFrameUA(frame.PF());
break;
default:
unexpectedMessage();
return;
}
}
void L2LAPDm::receiveIFrame(const L2Frame& frame)
{
// Caller should hold mLock.
// See GSM 04.06 5.4.1.4.
mEstablishmentInProgress = false;
OBJLOG(INFO) << "state=" << mState << " NS=" << frame.NS() << " NR=" << frame.NR() << " " << frame;
// vISDN datalink.c:lapd_handle_iframe
// GSM 04.06 5.5.2, 5.7.1
// Q.921 5.6.2, 5.8.1
switch (mState) {
case ContentionResolution:
mState=LinkEstablished;
// continue to next case...
case LinkEstablished:
processAck(frame.NR());
if (frame.NS()==mVR) {
mVR = (mVR+1)%8;
bufferIFrameData(frame);
sendSFrameRR(frame.PF());
} else {
// GSM 04.06 5.7.1.
// Q.921 5.8.1.
sendSFrameREJ(frame.PF());
}
case LinkReleased:
// GSM 04.06 5.4.5
break;
default:
// ignore
break;
}
}
void L2LAPDm::receiveSFrameREJ(const L2Frame& frame)
{
// Caller should hold mLock.
OBJLOG(INFO) << "state=" << mState << " " << frame;
// GSM 04.06 3.8.6, 5.5.4
// Q.921 3.7.6, 5.6.4.
// vISDN datalink.c:lapd_handle_s_frame_rej.
switch (mState) {
case ContentionResolution:
mState = LinkEstablished;
// continue to next case...
case LinkEstablished:
// FIXME -- The spec says to do this but it breaks multiframe transmission.
//mVS = mVA = frame.NR();
processAck(frame.NR());
if (frame.PF()) {
if (frame.CR()!=mC) sendSFrameRR(true);
else {
unexpectedMessage();
return;
}
}
// Since k=1, there's really nothing to retransmit,
// other than what was just rejected, so kust stop sending it.
sendIdle();
break;
default:
// ignore
break;
}
// Send an idle frame to clear any repeating junk on the channel.
sendIdle();
}
void L2LAPDm::receiveSFrameRR(const L2Frame& frame)
{
// Caller should hold mLock.
OBJLOG(INFO) << "state=" << mState << " " << frame;
// GSM 04.06 3.8.5.
// Q.921 3.6.6.
// vISDN datalink.c:lapd_handle_sframe_rr
// Again, since LAPDm allows only one outstanding frame
// (k=1), this is a lot simpler than in LAPD.
switch (mState) {
case ContentionResolution:
mState = LinkEstablished;
// continue to next case...
case LinkEstablished:
// "inquiry response procedure"
// Never actually seen that happen in GSM...
if ((frame.CR()!=mC) && (frame.PF())) {
sendSFrameRR(true);
}
processAck(frame.NR());
break;
default:
// ignore
return;
}
}
void L2LAPDm::receiveUFrameUA(const L2Frame& frame)
{
// Caller should hold mLock.
// GSM 04.06 3.8.8
// vISDN datalink.c:lapd_socket_handle_uframe_ua
OBJLOG(INFO) << "state=" << mState << " " << frame;
if (!frame.PF()) {
unexpectedMessage();
return;
}
switch (mState) {
case AwaitingEstablish:
// We sent SABM and the peer responded.
clearCounters();
mState = LinkEstablished;
mAckSignal.signal();
mL3Out.write(new L3Frame(ESTABLISH));
break;
case AwaitingRelease:
// We sent DISC and the peer responded.
clearState();
break;
default:
unexpectedMessage();
return;
}
}
void L2LAPDm::sendUFrameUA(const L2Frame& frame)
{
// Send UA frame with a echoed payload.
// This is used in the contention resolution procedure.
// GSM 04.06 5.4.1.4.
// The caller need not hold mLock.
OBJLOG(INFO) << "state=" << mState << " " << frame;
L2Address address(mR,mSAPI);
L2Control control(L2Control::UFormat,frame.PF(),0x0C);
L2Length length(frame.L());
L2Header header(address,control,length);
writeL1NoAck(L2Frame(header,frame.L3Part()));
}
void L2LAPDm::receiveUFrameDM(const L2Frame& frame)
{
// Caller should hold mLock.
OBJLOG(INFO) << "state=" << mState << " " << frame;
// GSM 04.06 5.4.5
if (mState==LinkReleased) return;
// GSM 04.06 5.4.6.3
if (!frame.PF()) return;
// Because we do not support multiple TEIs in LAPDm,
// and because we should never get DM in response to SABM,
// this procedure is much simpler that in vISDN LAPD.
// Unlike LAPD, there's also no reason for LAPDm to not be
// able to establish ABM, so if we get this message
// we know the channel is screwed up.
clearState();
}
void L2LAPDm::receiveUFrameSABM(const L2Frame& frame)
{
// Caller should hold mLock.
// Process the incoming SABM command.
// GSM 04.06 3.8.2, 5.4.1
// Q.921 5.5.1.2.
// Also borrows from vISDN datalink.c:lapd_socket_handle_uframe_sabm.
OBJLOG(INFO) << "state=" << mState << " " << frame;
// Ignore frame if P!=1.
// See GSM 04.06 5.4.1.2.
if (!frame.PF()) return;
// Dispatch according to current state.
// BTW, LAPDm can always enter multiframe mode when requested,
// so that's another big simplification over ISDN/LAPD.
switch (mState) {
case LinkReleased:
// GSM 04.06 5.4.5, 5.4.1.2, 5.4.1.4
clearCounters();
mEstablishmentInProgress = true;
// Tell L3 what happened.
mL3Out.write(new L3Frame(ESTABLISH));
if (frame.L()) {
// Presence of an L3 payload indicates contention resolution.
// GSM 04.06 5.4.1.4.
mState=ContentionResolution;
mContentionCheck = frame.sum();
mL3Out.write(new L3Frame(frame.L3Part(),DATA));
// Echo back payload.
sendUFrameUA(frame);
} else {
mState=LinkEstablished;
sendUFrameUA(frame.PF());
}
break;
case ContentionResolution:
// GSM 04.06 5.4.1.4
// This guards against the remote possibility that two handsets
// are sending on the same channel at the same time.
// vISDN's LAPD doesn't need/do this since peers are hard-wired
if (frame.sum()!=mContentionCheck) break;
mState=LinkEstablished;
sendUFrameUA(frame);
break;
case AwaitingEstablish:
// Huh? This would mean both sides sent SABM at the same time/
// That should not happen in GSM.
sendUFrameUA(frame.PF());
OBJLOG(WARN) << "simulatenous SABM attempts";
break;
case AwaitingRelease:
// If we are awaiting release, we will not enter ABM.
// So we send DM to indicate that.
sendUFrameDM(frame.PF());
break;
case LinkEstablished:
// Latency in contention resolution, GSM 04.06 5.4.2.1.
if (mEstablishmentInProgress) {
if (frame.L()) sendUFrameUA(frame);
else sendUFrameUA(frame.PF());
break;
}
if (frame.L()) {
abnormalRelease();
break;
}
// Re-establishment procedure, GSM 04.06 5.6.3.
// This basically resets the ack engine.
// We should not actually see this, as of rev 2.4.
OBJLOG(WARN) << "reestablishment not really supported";
sendUFrameUA(frame.PF());
clearCounters();
break;
default:
unexpectedMessage();
return;
}
}
