Esempio n. 1
0
void ax25_std_idletimer_expiry(ax25_cb *ax25)
{
	ax25_clear_queues(ax25);

	ax25->n2count = 0;
	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
	ax25->state   = AX25_STATE_2;

	ax25_calculate_t1(ax25);
	ax25_start_t1timer(ax25);
	ax25_stop_t2timer(ax25);
	ax25_stop_t3timer(ax25);

	if (ax25->sk != NULL) {
		bh_lock_sock(ax25->sk);
		ax25->sk->sk_state     = TCP_CLOSE;
		ax25->sk->sk_err       = 0;
		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
			ax25->sk->sk_state_change(ax25->sk);
			sock_set_flag(ax25->sk, SOCK_DEAD);
		}
		bh_unlock_sock(ax25->sk);
	}
}
Esempio n. 2
0
/*
 *	AX.25 TIMER 
 *
 *	This routine is called every 500ms. Decrement timer by this
 *	amount - if expired then process the event.
 */
static void ax25_timer(unsigned long param)
{
	ax25_cb *ax25 = (ax25_cb *)param;

	switch (ax25->state) {
		case AX25_STATE_0:
			/* Magic here: If we listen() and a new link dies before it
			   is accepted() it isn't 'dead' so doesn't get removed. */
			if (ax25->sk == NULL || ax25->sk->destroy || (ax25->sk->state == TCP_LISTEN && ax25->sk->dead)) {
				del_timer(&ax25->timer);
				ax25_destroy_socket(ax25);
				return;
			}
			break;

		case AX25_STATE_3:
		case AX25_STATE_4:
			/*
			 * Check the state of the receive buffer.
			 */
			if (ax25->sk != NULL) {
				if (ax25->sk->rmem_alloc < (ax25->sk->rcvbuf / 2) && (ax25->condition & OWN_RX_BUSY_CONDITION)) {
					ax25->condition &= ~OWN_RX_BUSY_CONDITION;
					if (!ax25->dama_slave)
						ax25_send_control(ax25, RR, POLLOFF, C_RESPONSE);
					ax25->condition &= ~ACK_PENDING_CONDITION;
					break;
				}
			}
			/*
			 * Check for frames to transmit.
			 */
			if (!ax25->dama_slave)
				ax25_kick(ax25);
			break;

		default:
			break;
	}

	if (ax25->t2timer > 0 && --ax25->t2timer == 0) {
		if (ax25->state == AX25_STATE_3 || ax25->state == AX25_STATE_4) {
			if (ax25->condition & ACK_PENDING_CONDITION) {
				ax25->condition &= ~ACK_PENDING_CONDITION;
				if (!ax25->dama_slave)
					ax25_timeout_response(ax25);
			}
		}
	}

	if (ax25->t3timer > 0 && --ax25->t3timer == 0) {
		/* dl1bke 960114: T3 expires and we are in DAMA mode:  */
		/*                send a DISC and abort the connection */
		if (ax25->dama_slave) {
#ifdef CONFIG_NETROM
			nr_link_failed(&ax25->dest_addr, ax25->device);
#endif
			ax25_clear_queues(ax25);
			ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
				
			ax25->state = AX25_STATE_0;
			if (ax25->sk != NULL) {
				if (ax25->sk->debug)
					printk("T3 Timeout\n");
				ax25->sk->state = TCP_CLOSE;
				ax25->sk->err   = ETIMEDOUT;
				if (!ax25->sk->dead)
					ax25->sk->state_change(ax25->sk);
				ax25->sk->dead  = 1;
			}

			ax25_reset_timer(ax25);
			return;
		}
		
		if (ax25->state == AX25_STATE_3) {
			ax25->n2count = 0;
			ax25_transmit_enquiry(ax25);
			ax25->state   = AX25_STATE_4;
		}
		ax25->t3timer = ax25->t3;
	}
	
	if (ax25->idletimer > 0 && --ax25->idletimer == 0) {
		/* dl1bke 960228: close the connection when IDLE expires */
		/* 		  similar to DAMA T3 timeout but with    */
		/* 		  a "clean" disconnect of the connection */

		ax25_clear_queues(ax25);

		ax25->n2count = 0;
		if (!ax25->dama_slave) {
			ax25->t3timer = 0;
			ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
		} else {
			ax25->t3timer = ax25->t3;
		}
		
		/* state 1 or 2 should not happen, but... */
		
		if (ax25->state == AX25_STATE_1 || ax25->state == AX25_STATE_2)
			ax25->state = AX25_STATE_0;
		else
			ax25->state = AX25_STATE_2;

		ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);

		if (ax25->sk != NULL) {
			ax25->sk->state = TCP_CLOSE;
			ax25->sk->err = 0;
			if (!ax25->sk->dead)
				ax25->sk->state_change(ax25->sk);
			ax25->sk->dead = 1;
			ax25->sk->destroy = 1;
		}
	}
		                                                                                                                                                                                                                                                                                                                                        
	/* dl1bke 960114: DAMA T1 timeouts are handled in ax25_dama_slave_transmit */
	/* 		  nevertheless we have to re-enqueue the timer struct...   */
	
	if (ax25->t1timer == 0 || --ax25->t1timer > 0) {
		ax25_reset_timer(ax25);
		return;
	}

	if (!ax25_dev_is_dama_slave(ax25->device)) {
		if (ax25->dama_slave)
			ax25->dama_slave = 0;
		ax25_t1_timeout(ax25);
	}
}
Esempio n. 3
0
/* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC
 *                within the poll of any connected channel. Remember 
 *                that we are not allowed to send anything unless we
 *                get polled by the Master.
 *                
 *                Thus we'll have to do parts of our T1 handling in
 *                ax25_enquiry_response().
 */
void ax25_t1_timeout(ax25_cb * ax25)
{	
	switch (ax25->state) {
		case AX25_STATE_1: 
			if (ax25->n2count == ax25->n2) {
				if (ax25->modulus == MODULUS) {
#ifdef CONFIG_NETROM
					nr_link_failed(&ax25->dest_addr, ax25->device);
#endif
					ax25_clear_queues(ax25);
					ax25->state = AX25_STATE_0;
					if (ax25->sk != NULL) {
						ax25->sk->state = TCP_CLOSE;
						ax25->sk->err   = ETIMEDOUT;
						if (!ax25->sk->dead)
							ax25->sk->state_change(ax25->sk);
						ax25->sk->dead  = 1;
					}
				} else {
					ax25->modulus = MODULUS;
					ax25->window  = ax25_dev_get_value(ax25->device, AX25_VALUES_WINDOW);
					ax25->n2count = 0;
					ax25_send_control(ax25, SABM, ax25_dev_is_dama_slave(ax25->device)? POLLOFF : POLLON, C_COMMAND);
				}
			} else {
				ax25->n2count++;
				if (ax25->modulus == MODULUS) {
					ax25_send_control(ax25, SABM, ax25_dev_is_dama_slave(ax25->device)? POLLOFF : POLLON, C_COMMAND);
				} else {
					ax25_send_control(ax25, SABME, ax25_dev_is_dama_slave(ax25->device)? POLLOFF : POLLON, C_COMMAND);
				}
			}
			break;

		case AX25_STATE_2:
			if (ax25->n2count == ax25->n2) {
#ifdef CONFIG_NETROM
				nr_link_failed(&ax25->dest_addr, ax25->device);
#endif
				ax25_clear_queues(ax25);
				ax25->state = AX25_STATE_0;
				ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
				
				if (ax25->sk != NULL) {
					ax25->sk->state = TCP_CLOSE;
					ax25->sk->err   = ETIMEDOUT;
					if (!ax25->sk->dead)
						ax25->sk->state_change(ax25->sk);
					ax25->sk->dead  = 1;
				}
			} else {
				ax25->n2count++;
				if (!ax25_dev_is_dama_slave(ax25->device))
					ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
			}
			break;

		case AX25_STATE_3: 
			ax25->n2count = 1;
			if (!ax25->dama_slave)
				ax25_transmit_enquiry(ax25);
			ax25->state   = AX25_STATE_4;
			break;

		case AX25_STATE_4:
			if (ax25->n2count == ax25->n2) {
#ifdef CONFIG_NETROM
				nr_link_failed(&ax25->dest_addr, ax25->device);
#endif
				ax25_clear_queues(ax25);
				ax25_send_control(ax25, DM, POLLON, C_RESPONSE);
				ax25->state = AX25_STATE_0;
				if (ax25->sk != NULL) {
					if (ax25->sk->debug)
						printk("Link Failure\n");
					ax25->sk->state = TCP_CLOSE;
					ax25->sk->err   = ETIMEDOUT;
					if (!ax25->sk->dead)
						ax25->sk->state_change(ax25->sk);
					ax25->sk->dead  = 1;
				}
			} else {
				ax25->n2count++;
				if (!ax25->dama_slave)
					ax25_transmit_enquiry(ax25);
			}
			break;
	}

	ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);

	ax25_set_timer(ax25);
}