1 files changed, 248 insertions, 0 deletions

diff --git a/kernel/net/netrom/nr_timer.c b/kernel/net/netrom/nr_timer.c
new file mode 100644
index 000000000..94d05806a
--- /dev/null
+++ b/kernel/net/netrom/nr_timer.c
@@ -0,0 +1,248 @@
+/*
+ * 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/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/netrom.h>
+
+static void nr_heartbeat_expiry(unsigned long);
+static void nr_t1timer_expiry(unsigned long);
+static void nr_t2timer_expiry(unsigned long);
+static void nr_t4timer_expiry(unsigned long);
+static void nr_idletimer_expiry(unsigned long);
+
+void nr_init_timers(struct sock *sk)
+{
+	struct nr_sock *nr = nr_sk(sk);
+
+	setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
+	setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
+	setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
+	setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
+
+	/* initialized by sock_init_data */
+	sk->sk_timer.data     = (unsigned long)sk;
+	sk->sk_timer.function = &nr_heartbeat_expiry;
+}
+
+void nr_start_t1timer(struct sock *sk)
+{
+	struct nr_sock *nr = nr_sk(sk);
+
+	mod_timer(&nr->t1timer, jiffies + nr->t1);
+}
+
+void nr_start_t2timer(struct sock *sk)
+{
+	struct nr_sock *nr = nr_sk(sk);
+
+	mod_timer(&nr->t2timer, jiffies + nr->t2);
+}
+
+void nr_start_t4timer(struct sock *sk)
+{
+	struct nr_sock *nr = nr_sk(sk);
+
+	mod_timer(&nr->t4timer, jiffies + nr->t4);
+}
+
+void nr_start_idletimer(struct sock *sk)
+{
+	struct nr_sock *nr = nr_sk(sk);
+
+	if (nr->idle > 0)
+		mod_timer(&nr->idletimer, jiffies + nr->idle);
+}
+
+void nr_start_heartbeat(struct sock *sk)
+{
+	mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
+}
+
+void nr_stop_t1timer(struct sock *sk)
+{
+	del_timer(&nr_sk(sk)->t1timer);
+}
+
+void nr_stop_t2timer(struct sock *sk)
+{
+	del_timer(&nr_sk(sk)->t2timer);
+}
+
+void nr_stop_t4timer(struct sock *sk)
+{
+	del_timer(&nr_sk(sk)->t4timer);
+}
+
+void nr_stop_idletimer(struct sock *sk)
+{
+	del_timer(&nr_sk(sk)->idletimer);
+}
+
+void nr_stop_heartbeat(struct sock *sk)
+{
+	del_timer(&sk->sk_timer);
+}
+
+int nr_t1timer_running(struct sock *sk)
+{
+	return timer_pending(&nr_sk(sk)->t1timer);
+}
+
+static void nr_heartbeat_expiry(unsigned long param)
+{
+	struct sock *sk = (struct sock *)param;
+	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);
+			sock_put(sk);
+			return;
+		}
+		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);
+}
+
+static void nr_t2timer_expiry(unsigned long param)
+{
+	struct sock *sk = (struct sock *)param;
+	struct nr_sock *nr = nr_sk(sk);
+
+	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);
+}
+
+static void nr_t4timer_expiry(unsigned long param)
+{
+	struct sock *sk = (struct sock *)param;
+
+	bh_lock_sock(sk);
+	nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
+	bh_unlock_sock(sk);
+}
+
+static void nr_idletimer_expiry(unsigned long param)
+{
+	struct sock *sk = (struct sock *)param;
+	struct nr_sock *nr = nr_sk(sk);
+
+	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);
+}
+
+static void nr_t1timer_expiry(unsigned long param)
+{
+	struct sock *sk = (struct sock *)param;
+	struct nr_sock *nr = nr_sk(sk);
+
+	bh_lock_sock(sk);
+	switch (nr->state) {
+	case NR_STATE_1:
+		if (nr->n2count == nr->n2) {
+			nr_disconnect(sk, ETIMEDOUT);
+			bh_unlock_sock(sk);
+			return;
+		} else {
+			nr->n2count++;
+			nr_write_internal(sk, NR_CONNREQ);
+		}
+		break;
+
+	case NR_STATE_2:
+		if (nr->n2count == nr->n2) {
+			nr_disconnect(sk, ETIMEDOUT);
+			bh_unlock_sock(sk);
+			return;
+		} else {
+			nr->n2count++;
+			nr_write_internal(sk, NR_DISCREQ);
+		}
+		break;
+
+	case NR_STATE_3:
+		if (nr->n2count == nr->n2) {
+			nr_disconnect(sk, ETIMEDOUT);
+			bh_unlock_sock(sk);
+			return;
+		} else {
+			nr->n2count++;
+			nr_requeue_frames(sk);
+		}
+		break;
+	}
+
+	nr_start_t1timer(sk);
+	bh_unlock_sock(sk);
+}