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);
}
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);
}
/*
* 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;
}
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);
}
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);
}
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;
}
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);
}
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;
}
/*
* 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);
}
/*
* 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;
}