diff options
Diffstat (limited to 'net/netrom/nr_timer.c')
| -rw-r--r-- | net/netrom/nr_timer.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/net/netrom/nr_timer.c b/net/netrom/nr_timer.c new file mode 100644 index 000000000..4e7c968cd --- /dev/null +++ b/net/netrom/nr_timer.c @@ -0,0 +1,248 @@ +// 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))) { + 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); +} |