/*
* Process an incoming LAPB frame
*/
void lapb_data_input(lapb_cb *lapb, struct sk_buff *skb)
{
struct lapb_frame frame;
lapb_decode(lapb, skb, &frame);
switch (lapb->state) {
case LAPB_STATE_0:
lapb_state0_machine(lapb, skb, &frame);
break;
case LAPB_STATE_1:
lapb_state1_machine(lapb, skb, &frame);
break;
case LAPB_STATE_2:
lapb_state2_machine(lapb, skb, &frame);
break;
case LAPB_STATE_3:
lapb_state3_machine(lapb, skb, &frame);
break;
case LAPB_STATE_4:
lapb_state4_machine(lapb, skb, &frame);
break;
}
lapb_kick(lapb);
}
int lapb_data_request(void *token, struct sk_buff *skb)
{
lapb_cb *lapb;
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
return LAPB_NOTCONNECTED;
skb_queue_tail(&lapb->write_queue, skb);
lapb_kick(lapb);
return LAPB_OK;
}
void lapb_t201timer_expiry(void * lapb_ptr) {
struct lapb_cs *lapb = lapb_ptr;
if (!lapb) return;
struct lapb_cs_internal * lapb_int = lapb_get_internal(lapb);
lapb_int->RC++;
lapb->callbacks->debug(3, "[LAPB] S%d Timer_201 expired(%d of %d)",
lapb_int->state, lapb_int->RC, lapb->N201);
switch (lapb_int->state) {
/*
* If we are a DCE, keep going DM .. DM .. DM
*/
case LAPB_STATE_0:
if (lapb_is_dce(lapb)) {
lapb_int->RC = 0;
lapb->callbacks->debug(2, "[LAPB] S0 TX DM(0)");
lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
};
break;
/*
* Awaiting connection state, send SABM(E), up to N2 times.
*/
case LAPB_STATE_1:
if (lapb_int->RC >= lapb->N201) {
lapb_stop_t201timer(lapb);
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_reset(lapb, LAPB_STATE_0);
} else {
if (lapb_is_extended(lapb)) {
lapb->callbacks->debug(2, "[LAPB] S1 TX SABME(1)");
lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
} else {
lapb->callbacks->debug(2, "[LAPB] S1 TX SABM(1)");
lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
};
};
break;
/*
* Awaiting disconnection state, send DISC, up to N2 times.
*/
case LAPB_STATE_2:
if (lapb_int->RC >= lapb->N201) {
lapb_stop_t201timer(lapb);
lapb_requeue_frames(lapb);
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_reset(lapb, LAPB_STATE_0);
} else {
lapb->callbacks->debug(2, "[LAPB] S2 TX DISC(1)");
lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
};
break;
/*
* Data transfer state, restransmit I frames, up to N2 times.
*/
case LAPB_STATE_3:
lapb_requeue_frames(lapb);
if (lapb_int->RC >= lapb->N201) {
lapb_stop_t201timer(lapb);
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_reset(lapb, LAPB_STATE_0);
} else {
if (lapb_int->condition & LAPB_FRMR_CONDITION)
lapb_transmit_frmr(lapb);
else
lapb_kick(lapb);
};
break;
/*
* Frame reject state, restransmit FRMR frames, up to N2 times.
*/
case LAPB_STATE_4:
if (lapb_int->RC >= lapb->N201) {
lapb_stop_t201timer(lapb);
lapb_requeue_frames(lapb);
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_reset(lapb, LAPB_STATE_0);
} else {
lapb_transmit_frmr(lapb);
};
break;
};
}
