/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 <asm/system.h>#include <linux/fcntl.h>#include <linux/mm.h>#include <linux/interrupt.h>#include <net/rose.h> static void rose_heartbeat_expiry(unsigned long);static void rose_timer_expiry(unsigned long);static void rose_idletimer_expiry(unsigned long); void rose_start_heartbeat(struct sock *sk){	del_timer(&sk->sk_timer); 	sk->sk_timer.data     = (unsigned long)sk;	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.data     = (unsigned long)sk;	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.data     = (unsigned long)sk;	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.data     = (unsigned long)sk;	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.data     = (unsigned long)sk;	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.data     = (unsigned long)sk;		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(unsigned long param){	struct sock *sk = (struct sock *)param;	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(unsigned long param){	struct sock *sk = (struct sock *)param;	struct rose_sock *rose = rose_sk(sk); 	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(unsigned long param){	struct sock *sk = (struct sock *)param; 	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);}