/* Higher level upcall for a LAPB frame - called with sk locked */
int nr_process_rx_frame(struct sock *sk, struct sk_buff *skb)
{
struct nr_sock *nr = nr_sk(sk);
int queued = 0, frametype;
if (nr->state == NR_STATE_0)
return 0;
frametype = skb->data[19];
switch (nr->state) {
case NR_STATE_1:
queued = nr_state1_machine(sk, skb, frametype);
break;
case NR_STATE_2:
queued = nr_state2_machine(sk, skb, frametype);
break;
case NR_STATE_3:
queued = nr_state3_machine(sk, skb, frametype);
break;
}
nr_kick(sk);
return queued;
}
void nr_output(struct sock *sk, struct sk_buff *skb)
{
struct sk_buff *skbn;
unsigned char transport[NR_TRANSPORT_LEN];
int err, frontlen, len;
if (skb->len - NR_TRANSPORT_LEN > NR_MAX_PACKET_SIZE) {
/* Save a copy of the Transport Header */
skb_copy_from_linear_data(skb, transport, NR_TRANSPORT_LEN);
skb_pull(skb, NR_TRANSPORT_LEN);
frontlen = skb_headroom(skb);
while (skb->len > 0) {
if ((skbn = sock_alloc_send_skb(sk, frontlen + NR_MAX_PACKET_SIZE, 0, &err)) == NULL)
return;
skb_reserve(skbn, frontlen);
len = (NR_MAX_PACKET_SIZE > skb->len) ? skb->len : NR_MAX_PACKET_SIZE;
/* Copy the user data */
skb_copy_from_linear_data(skb, skb_put(skbn, len), len);
skb_pull(skb, len);
/* Duplicate the Transport Header */
skb_push(skbn, NR_TRANSPORT_LEN);
skb_copy_to_linear_data(skbn, transport,
NR_TRANSPORT_LEN);
if (skb->len > 0)
skbn->data[4] |= NR_MORE_FLAG;
skb_queue_tail(&sk->sk_write_queue, skbn); /* Throw it on the queue */
}
kfree_skb(skb);
} else {
skb_queue_tail(&sk->sk_write_queue, skb); /* Throw it on the queue */
}
nr_kick(sk);
}
/*
* 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);
}
