예제 #1
0
static void nr_heartbeat_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;

	switch (sk->protinfo.nr->state) {

		case NR_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 (sk->destroy || (sk->state == TCP_LISTEN && sk->dead)) {
				nr_destroy_socket(sk);
				return;
			}
			break;

		case NR_STATE_3:
			/*
			 * Check for the state of the receive buffer.
			 */
			if (atomic_read(&sk->rmem_alloc) < (sk->rcvbuf / 2) &&
			    (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)) {
				sk->protinfo.nr->condition &= ~NR_COND_OWN_RX_BUSY;
				sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
				sk->protinfo.nr->vl         = sk->protinfo.nr->vr;
				nr_write_internal(sk, NR_INFOACK);
				break;
			}
			break;
	}

	nr_start_heartbeat(sk);
}
예제 #2
0
static void nr_idletimer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct nr_sock *nr = nr_sk(sk);

	bh_lock_sock(sk);

	nr_clear_queues(sk);

	nr->n2count = 0;
	nr_write_internal(sk, NR_DISCREQ);
	nr->state = NR_STATE_2;

	nr_start_t1timer(sk);
	nr_stop_t2timer(sk);
	nr_stop_t4timer(sk);

	sk->sk_state     = TCP_CLOSE;
	sk->sk_err       = 0;
	sk->sk_shutdown |= SEND_SHUTDOWN;

	if (!sock_flag(sk, SOCK_DEAD)) {
		sk->sk_state_change(sk);
		sock_set_flag(sk, SOCK_DEAD);
	}
	bh_unlock_sock(sk);
}
예제 #3
0
파일: nr_in.c 프로젝트: CSCLOG/beaglebone
/*
 * State machine for state 2, Awaiting Release State.
 * The handling of the timer(s) is in file nr_timer.c
 * Handling of state 0 and connection release is in netrom.c.
 */
static int nr_state2_machine(struct sock *sk, struct sk_buff *skb,
	int frametype)
{
	switch (frametype) {
	case NR_CONNACK | NR_CHOKE_FLAG:
		nr_disconnect(sk, ECONNRESET);
		break;

	case NR_DISCREQ:
		nr_write_internal(sk, NR_DISCACK);

	case NR_DISCACK:
		nr_disconnect(sk, 0);
		break;

	case NR_RESET:
		if (sysctl_netrom_reset_circuit)
			nr_disconnect(sk, ECONNRESET);
		break;

	default:
		break;
	}
	return 0;
}
예제 #4
0
static void nr_t1timer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct nr_sock *nr = nr_sk(sk);

	bh_lock_sock(sk);
	switch (nr->state) {
	case NR_STATE_1:
		if (nr->n2count == nr->n2) {
			nr_disconnect(sk, ETIMEDOUT);
			bh_unlock_sock(sk);
			return;
		} else {
			nr->n2count++;
			nr_write_internal(sk, NR_CONNREQ);
		}
		break;

	case NR_STATE_2:
		if (nr->n2count == nr->n2) {
			nr_disconnect(sk, ETIMEDOUT);
			bh_unlock_sock(sk);
			return;
		} else {
			nr->n2count++;
			nr_write_internal(sk, NR_DISCREQ);
		}
		break;

	case NR_STATE_3:
		if (nr->n2count == nr->n2) {
			nr_disconnect(sk, ETIMEDOUT);
			bh_unlock_sock(sk);
			return;
		} else {
			nr->n2count++;
			nr_requeue_frames(sk);
		}
		break;
	}

	nr_start_t1timer(sk);
	bh_unlock_sock(sk);
}
예제 #5
0
void nr_establish_data_link(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	nr->condition = 0x00;
	nr->n2count   = 0;

	nr_write_internal(sk, NR_CONNREQ);

	nr_stop_t2timer(sk);
	nr_stop_t4timer(sk);
	nr_stop_idletimer(sk);
	nr_start_t1timer(sk);
}
예제 #6
0
void nr_enquiry_response(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);
	int frametype = NR_INFOACK;

	if (nr->condition & NR_COND_OWN_RX_BUSY) {
		frametype |= NR_CHOKE_FLAG;
	} else {
		if (skb_peek(&nr->reseq_queue) != NULL)
			frametype |= NR_NAK_FLAG;
	}

	nr_write_internal(sk, frametype);

	nr->vl         = nr->vr;
	nr->condition &= ~NR_COND_ACK_PENDING;
}
예제 #7
0
static void nr_heartbeat_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct nr_sock *nr = nr_sk(sk);

	bh_lock_sock(sk);
	switch (nr->state) {
	case NR_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 (sock_flag(sk, SOCK_DESTROY) ||
		    (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
			sock_hold(sk);
			bh_unlock_sock(sk);
			nr_destroy_socket(sk);
			sock_put(sk);
			return;
		}
		break;

	case NR_STATE_3:
		/*
		 * Check for the state of the receive buffer.
		 */
		if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
		    (nr->condition & NR_COND_OWN_RX_BUSY)) {
			nr->condition &= ~NR_COND_OWN_RX_BUSY;
			nr->condition &= ~NR_COND_ACK_PENDING;
			nr->vl         = nr->vr;
			nr_write_internal(sk, NR_INFOACK);
			break;
		}
		break;
	}

	nr_start_heartbeat(sk);
	bh_unlock_sock(sk);
}
예제 #8
0
static void nr_idletimer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;

	nr_clear_queues(sk);

	sk->protinfo.nr->n2count = 0;
	nr_write_internal(sk, NR_DISCREQ);
	sk->protinfo.nr->state = NR_STATE_2;

	nr_start_t1timer(sk);
	nr_stop_t2timer(sk);
	nr_stop_t4timer(sk);

	sk->state     = TCP_CLOSE;
	sk->err       = 0;
	sk->shutdown |= SEND_SHUTDOWN;

	if (!sk->dead)
		sk->state_change(sk);

	sk->dead = 1;
}
예제 #9
0
/*
 *	NET/ROM TIMER 
 *
 *	This routine is called every 100ms. Decrement timer by this
 *	amount - if expired then process the event.
 */
static void nr_timer(unsigned long param)
{
	struct sock *sk = (struct sock *)param;

	switch (sk->protinfo.nr->state) {
		case NR_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 (sk->destroy || (sk->state == TCP_LISTEN && sk->dead)) {
				del_timer(&sk->timer);
				nr_destroy_socket(sk);
				return;
			}
			break;

		case NR_STATE_3:
			/*
			 * Check for the state of the receive buffer.
			 */
			if (sk->rmem_alloc < (sk->rcvbuf / 2) && (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)) {
				sk->protinfo.nr->condition &= ~NR_COND_OWN_RX_BUSY;
				sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
				sk->protinfo.nr->vl         = sk->protinfo.nr->vr;
				nr_write_internal(sk, NR_INFOACK);
				break;
			}
			/*
			 * Check for frames to transmit.
			 */
			nr_kick(sk);
			break;

		default:
			break;
	}

	if (sk->protinfo.nr->t2timer > 0 && --sk->protinfo.nr->t2timer == 0) {
		if (sk->protinfo.nr->state == NR_STATE_3) {
			if (sk->protinfo.nr->condition & NR_COND_ACK_PENDING) {
				sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
				nr_enquiry_response(sk);
			}
		}
	}

	if (sk->protinfo.nr->t4timer > 0 && --sk->protinfo.nr->t4timer == 0) {
		sk->protinfo.nr->condition &= ~NR_COND_PEER_RX_BUSY;
	}

	if (sk->protinfo.nr->t1timer == 0 || --sk->protinfo.nr->t1timer > 0) {
		nr_set_timer(sk);
		return;
	}

	switch (sk->protinfo.nr->state) {
		case NR_STATE_1: 
			if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) {
				nr_clear_queues(sk);
				sk->protinfo.nr->state = NR_STATE_0;
				sk->state              = TCP_CLOSE;
				sk->err                = ETIMEDOUT;
				sk->shutdown          |= SEND_SHUTDOWN;
				if (!sk->dead)
					sk->state_change(sk);
				sk->dead               = 1;
			} else {
				sk->protinfo.nr->n2count++;
				nr_write_internal(sk, NR_CONNREQ);
			}
			break;

		case NR_STATE_2:
			if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) {
				nr_clear_queues(sk);
				sk->protinfo.nr->state = NR_STATE_0;
				sk->state              = TCP_CLOSE;
				sk->err                = ETIMEDOUT;
				sk->shutdown          |= SEND_SHUTDOWN;
				if (!sk->dead)
					sk->state_change(sk);
				sk->dead               = 1;
			} else {
				sk->protinfo.nr->n2count++;
				nr_write_internal(sk, NR_DISCREQ);
			}
			break;

		case NR_STATE_3:
			if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) {
				nr_clear_queues(sk);
				sk->protinfo.nr->state = NR_STATE_0;
				sk->state              = TCP_CLOSE;
				sk->err                = ETIMEDOUT;
				sk->shutdown          |= SEND_SHUTDOWN;
				if (!sk->dead)
					sk->state_change(sk);
				sk->dead               = 1;
			} else {
				sk->protinfo.nr->n2count++;
				nr_requeue_frames(sk);
			}
			break;
	}

	sk->protinfo.nr->t1timer = sk->protinfo.nr->t1;

	nr_set_timer(sk);
}
예제 #10
0
파일: nr_in.c 프로젝트: CSCLOG/beaglebone
/*
 * State machine for state 3, Connected State.
 * The handling of the timer(s) is in file nr_timer.c
 * Handling of state 0 and connection release is in netrom.c.
 */
static int nr_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
	struct nr_sock *nrom = nr_sk(sk);
	struct sk_buff_head temp_queue;
	struct sk_buff *skbn;
	unsigned short save_vr;
	unsigned short nr, ns;
	int queued = 0;

	nr = skb->data[18];
	ns = skb->data[17];

	switch (frametype) {
	case NR_CONNREQ:
		nr_write_internal(sk, NR_CONNACK);
		break;

	case NR_DISCREQ:
		nr_write_internal(sk, NR_DISCACK);
		nr_disconnect(sk, 0);
		break;

	case NR_CONNACK | NR_CHOKE_FLAG:
	case NR_DISCACK:
		nr_disconnect(sk, ECONNRESET);
		break;

	case NR_INFOACK:
	case NR_INFOACK | NR_CHOKE_FLAG:
	case NR_INFOACK | NR_NAK_FLAG:
	case NR_INFOACK | NR_NAK_FLAG | NR_CHOKE_FLAG:
		if (frametype & NR_CHOKE_FLAG) {
			nrom->condition |= NR_COND_PEER_RX_BUSY;
			nr_start_t4timer(sk);
		} else {
			nrom->condition &= ~NR_COND_PEER_RX_BUSY;
			nr_stop_t4timer(sk);
		}
		if (!nr_validate_nr(sk, nr)) {
			break;
		}
		if (frametype & NR_NAK_FLAG) {
			nr_frames_acked(sk, nr);
			nr_send_nak_frame(sk);
		} else {
			if (nrom->condition & NR_COND_PEER_RX_BUSY) {
				nr_frames_acked(sk, nr);
			} else {
				nr_check_iframes_acked(sk, nr);
			}
		}
		break;

	case NR_INFO:
	case NR_INFO | NR_NAK_FLAG:
	case NR_INFO | NR_CHOKE_FLAG:
	case NR_INFO | NR_MORE_FLAG:
	case NR_INFO | NR_NAK_FLAG | NR_CHOKE_FLAG:
	case NR_INFO | NR_CHOKE_FLAG | NR_MORE_FLAG:
	case NR_INFO | NR_NAK_FLAG | NR_MORE_FLAG:
	case NR_INFO | NR_NAK_FLAG | NR_CHOKE_FLAG | NR_MORE_FLAG:
		if (frametype & NR_CHOKE_FLAG) {
			nrom->condition |= NR_COND_PEER_RX_BUSY;
			nr_start_t4timer(sk);
		} else {
			nrom->condition &= ~NR_COND_PEER_RX_BUSY;
			nr_stop_t4timer(sk);
		}
		if (nr_validate_nr(sk, nr)) {
			if (frametype & NR_NAK_FLAG) {
				nr_frames_acked(sk, nr);
				nr_send_nak_frame(sk);
			} else {
				if (nrom->condition & NR_COND_PEER_RX_BUSY) {
					nr_frames_acked(sk, nr);
				} else {
					nr_check_iframes_acked(sk, nr);
				}
			}
		}
		queued = 1;
		skb_queue_head(&nrom->reseq_queue, skb);
		if (nrom->condition & NR_COND_OWN_RX_BUSY)
			break;
		skb_queue_head_init(&temp_queue);
		do {
			save_vr = nrom->vr;
			while ((skbn = skb_dequeue(&nrom->reseq_queue)) != NULL) {
				ns = skbn->data[17];
				if (ns == nrom->vr) {
					if (nr_queue_rx_frame(sk, skbn, frametype & NR_MORE_FLAG) == 0) {
						nrom->vr = (nrom->vr + 1) % NR_MODULUS;
					} else {
						nrom->condition |= NR_COND_OWN_RX_BUSY;
						skb_queue_tail(&temp_queue, skbn);
					}
				} else if (nr_in_rx_window(sk, ns)) {
					skb_queue_tail(&temp_queue, skbn);
				} else {
					kfree_skb(skbn);
				}
			}
			while ((skbn = skb_dequeue(&temp_queue)) != NULL) {
				skb_queue_tail(&nrom->reseq_queue, skbn);
			}
		} while (save_vr != nrom->vr);
		/*
		 * Window is full, ack it immediately.
		 */
		if (((nrom->vl + nrom->window) % NR_MODULUS) == nrom->vr) {
			nr_enquiry_response(sk);
		} else {
			if (!(nrom->condition & NR_COND_ACK_PENDING)) {
				nrom->condition |= NR_COND_ACK_PENDING;
				nr_start_t2timer(sk);
			}
		}
		break;

	case NR_RESET:
		if (sysctl_netrom_reset_circuit)
			nr_disconnect(sk, ECONNRESET);
		break;

	default:
		break;
	}
	return queued;
}