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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/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>
static void rose_heartbeat_expiry(struct timer_list *t);
static void rose_timer_expiry(struct timer_list *);
static void rose_idletimer_expiry(struct timer_list *);
void rose_start_heartbeat(struct sock *sk)
{
del_timer(&sk->sk_timer);
sk->sk_timer.function = rose_heartbeat_expiry;
sk->sk_timer.expires = jiffies + 5 * HZ;
add_timer(&sk->sk_timer);
}
void rose_start_t1timer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);
del_timer(&rose->timer);
rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->t1;
add_timer(&rose->timer);
}
void rose_start_t2timer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);
del_timer(&rose->timer);
rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->t2;
add_timer(&rose->timer);
}
void rose_start_t3timer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);
del_timer(&rose->timer);
rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->t3;
add_timer(&rose->timer);
}
void rose_start_hbtimer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);
del_timer(&rose->timer);
rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->hb;
add_timer(&rose->timer);
}
void rose_start_idletimer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);
del_timer(&rose->idletimer);
if (rose->idle > 0) {
rose->idletimer.function = rose_idletimer_expiry;
rose->idletimer.expires = jiffies + rose->idle;
add_timer(&rose->idletimer);
}
}
void rose_stop_heartbeat(struct sock *sk)
{
del_timer(&sk->sk_timer);
}
void rose_stop_timer(struct sock *sk)
{
del_timer(&rose_sk(sk)->timer);
}
void rose_stop_idletimer(struct sock *sk)
{
del_timer(&rose_sk(sk)->idletimer);
}
static void rose_heartbeat_expiry(struct timer_list *t)
{
struct sock *sk = from_timer(sk, t, sk_timer);
struct rose_sock *rose = rose_sk(sk);
bh_lock_sock(sk);
switch (rose->state) {
case ROSE_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))) {
bh_unlock_sock(sk);
rose_destroy_socket(sk);
return;
}
break;
case ROSE_STATE_3:
/*
* Check for the state of the receive buffer.
*/
if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
(rose->condition & ROSE_COND_OWN_RX_BUSY)) {
rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
rose->condition &= ~ROSE_COND_ACK_PENDING;
rose->vl = rose->vr;
rose_write_internal(sk, ROSE_RR);
rose_stop_timer(sk); /* HB */
break;
}
break;
}
rose_start_heartbeat(sk);
bh_unlock_sock(sk);
}
static void rose_timer_expiry(struct timer_list *t)
{
struct rose_sock *rose = from_timer(rose, t, timer);
struct sock *sk = &rose->sock;
bh_lock_sock(sk);
switch (rose->state) {
case ROSE_STATE_1: /* T1 */
case ROSE_STATE_4: /* T2 */
rose_write_internal(sk, ROSE_CLEAR_REQUEST);
rose->state = ROSE_STATE_2;
rose_start_t3timer(sk);
break;
case ROSE_STATE_2: /* T3 */
rose->neighbour->use--;
rose_disconnect(sk, ETIMEDOUT, -1, -1);
break;
case ROSE_STATE_3: /* HB */
if (rose->condition & ROSE_COND_ACK_PENDING) {
rose->condition &= ~ROSE_COND_ACK_PENDING;
rose_enquiry_response(sk);
}
break;
}
bh_unlock_sock(sk);
}
static void rose_idletimer_expiry(struct timer_list *t)
{
struct rose_sock *rose = from_timer(rose, t, idletimer);
struct sock *sk = &rose->sock;
bh_lock_sock(sk);
rose_clear_queues(sk);
rose_write_internal(sk, ROSE_CLEAR_REQUEST);
rose_sk(sk)->state = ROSE_STATE_2;
rose_start_t3timer(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);
}
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