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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
* Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/netrom.h>
static void nr_heartbeat_expiry(struct timer_list *);
static void nr_t1timer_expiry(struct timer_list *);
static void nr_t2timer_expiry(struct timer_list *);
static void nr_t4timer_expiry(struct timer_list *);
static void nr_idletimer_expiry(struct timer_list *);
void nr_init_timers(struct sock *sk)
{
struct nr_sock *nr = nr_sk(sk);
timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);
/* initialized by sock_init_data */
sk->sk_timer.function = nr_heartbeat_expiry;
}
void nr_start_t1timer(struct sock *sk)
{
struct nr_sock *nr = nr_sk(sk);
sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
}
void nr_start_t2timer(struct sock *sk)
{
struct nr_sock *nr = nr_sk(sk);
sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
}
void nr_start_t4timer(struct sock *sk)
{
struct nr_sock *nr = nr_sk(sk);
sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
}
void nr_start_idletimer(struct sock *sk)
{
struct nr_sock *nr = nr_sk(sk);
if (nr->idle > 0)
sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
}
void nr_start_heartbeat(struct sock *sk)
{
sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
}
void nr_stop_t1timer(struct sock *sk)
{
sk_stop_timer(sk, &nr_sk(sk)->t1timer);
}
void nr_stop_t2timer(struct sock *sk)
{
sk_stop_timer(sk, &nr_sk(sk)->t2timer);
}
void nr_stop_t4timer(struct sock *sk)
{
sk_stop_timer(sk, &nr_sk(sk)->t4timer);
}
void nr_stop_idletimer(struct sock *sk)
{
sk_stop_timer(sk, &nr_sk(sk)->idletimer);
}
void nr_stop_heartbeat(struct sock *sk)
{
sk_stop_timer(sk, &sk->sk_timer);
}
int nr_t1timer_running(struct sock *sk)
{
return timer_pending(&nr_sk(sk)->t1timer);
}
static void nr_heartbeat_expiry(struct timer_list *t)
{
struct sock *sk = from_timer(sk, t, sk_timer);
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))) {
if (sk->sk_state == TCP_LISTEN)
sock_hold(sk);
bh_unlock_sock(sk);
nr_destroy_socket(sk);
goto out;
}
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);
out:
sock_put(sk);
}
static void nr_t2timer_expiry(struct timer_list *t)
{
struct nr_sock *nr = from_timer(nr, t, t2timer);
struct sock *sk = &nr->sock;
bh_lock_sock(sk);
if (nr->condition & NR_COND_ACK_PENDING) {
nr->condition &= ~NR_COND_ACK_PENDING;
nr_enquiry_response(sk);
}
bh_unlock_sock(sk);
sock_put(sk);
}
static void nr_t4timer_expiry(struct timer_list *t)
{
struct nr_sock *nr = from_timer(nr, t, t4timer);
struct sock *sk = &nr->sock;
bh_lock_sock(sk);
nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
bh_unlock_sock(sk);
sock_put(sk);
}
static void nr_idletimer_expiry(struct timer_list *t)
{
struct nr_sock *nr = from_timer(nr, t, idletimer);
struct sock *sk = &nr->sock;
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);
sock_put(sk);
}
static void nr_t1timer_expiry(struct timer_list *t)
{
struct nr_sock *nr = from_timer(nr, t, t1timer);
struct sock *sk = &nr->sock;
bh_lock_sock(sk);
switch (nr->state) {
case NR_STATE_1:
if (nr->n2count == nr->n2) {
nr_disconnect(sk, ETIMEDOUT);
goto out;
} else {
nr->n2count++;
nr_write_internal(sk, NR_CONNREQ);
}
break;
case NR_STATE_2:
if (nr->n2count == nr->n2) {
nr_disconnect(sk, ETIMEDOUT);
goto out;
} else {
nr->n2count++;
nr_write_internal(sk, NR_DISCREQ);
}
break;
case NR_STATE_3:
if (nr->n2count == nr->n2) {
nr_disconnect(sk, ETIMEDOUT);
goto out;
} else {
nr->n2count++;
nr_requeue_frames(sk);
}
break;
}
nr_start_t1timer(sk);
out:
bh_unlock_sock(sk);
sock_put(sk);
}
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