1 files changed, 216 insertions, 0 deletions

diff --git a/net/rose/rose_timer.c b/net/rose/rose_timer.c
new file mode 100644
index 000000000000..84dd4403f792
--- /dev/null
+++ b/net/rose/rose_timer.c
@@ -0,0 +1,216 @@
+/*
+ * 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.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))) {
+                        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);
+}