| /* |
| * 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 <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(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.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.function = (TIMER_FUNC_TYPE)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 = (TIMER_FUNC_TYPE)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 = (TIMER_FUNC_TYPE)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 = (TIMER_FUNC_TYPE)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 = (TIMER_FUNC_TYPE)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(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); |
| } |