diff options
Diffstat (limited to 'net/rose/rose_timer.c')
| -rw-r--r-- | net/rose/rose_timer.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/net/rose/rose_timer.c b/net/rose/rose_timer.c new file mode 100644 index 000000000..f06ddbed3 --- /dev/null +++ b/net/rose/rose_timer.c @@ -0,0 +1,212 @@ +// 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) +{ + sk_stop_timer(sk, &sk->sk_timer); + + sk->sk_timer.function = rose_heartbeat_expiry; + sk->sk_timer.expires = jiffies + 5 * HZ; + + sk_reset_timer(sk, &sk->sk_timer, sk->sk_timer.expires); +} + +void rose_start_t1timer(struct sock *sk) +{ + struct rose_sock *rose = rose_sk(sk); + + sk_stop_timer(sk, &rose->timer); + + rose->timer.function = rose_timer_expiry; + rose->timer.expires = jiffies + rose->t1; + + sk_reset_timer(sk, &rose->timer, rose->timer.expires); +} + +void rose_start_t2timer(struct sock *sk) +{ + struct rose_sock *rose = rose_sk(sk); + + sk_stop_timer(sk, &rose->timer); + + rose->timer.function = rose_timer_expiry; + rose->timer.expires = jiffies + rose->t2; + + sk_reset_timer(sk, &rose->timer, rose->timer.expires); +} + +void rose_start_t3timer(struct sock *sk) +{ + struct rose_sock *rose = rose_sk(sk); + + sk_stop_timer(sk, &rose->timer); + + rose->timer.function = rose_timer_expiry; + rose->timer.expires = jiffies + rose->t3; + + sk_reset_timer(sk, &rose->timer, rose->timer.expires); +} + +void rose_start_hbtimer(struct sock *sk) +{ + struct rose_sock *rose = rose_sk(sk); + + sk_stop_timer(sk, &rose->timer); + + rose->timer.function = rose_timer_expiry; + rose->timer.expires = jiffies + rose->hb; + + sk_reset_timer(sk, &rose->timer, rose->timer.expires); +} + +void rose_start_idletimer(struct sock *sk) +{ + struct rose_sock *rose = rose_sk(sk); + + sk_stop_timer(sk, &rose->idletimer); + + if (rose->idle > 0) { + rose->idletimer.function = rose_idletimer_expiry; + rose->idletimer.expires = jiffies + rose->idle; + + sk_reset_timer(sk, &rose->idletimer, rose->idletimer.expires); + } +} + +void rose_stop_heartbeat(struct sock *sk) +{ + sk_stop_timer(sk, &sk->sk_timer); +} + +void rose_stop_timer(struct sock *sk) +{ + sk_stop_timer(sk, &rose_sk(sk)->timer); +} + +void rose_stop_idletimer(struct sock *sk) +{ + sk_stop_timer(sk, &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); + sock_put(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); + sock_put(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); + sock_put(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); + sock_put(sk); +} |